Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
3666a048 | 4 | Copyright (C) 1986-2021 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" | |
bab37966 | 22 | #include "displaced-stepping.h" |
45741a9c | 23 | #include "infrun.h" |
c906108c SS |
24 | #include <ctype.h> |
25 | #include "symtab.h" | |
26 | #include "frame.h" | |
27 | #include "inferior.h" | |
28 | #include "breakpoint.h" | |
c906108c SS |
29 | #include "gdbcore.h" |
30 | #include "gdbcmd.h" | |
31 | #include "target.h" | |
2f4fcf00 | 32 | #include "target-connection.h" |
c906108c SS |
33 | #include "gdbthread.h" |
34 | #include "annotate.h" | |
1adeb98a | 35 | #include "symfile.h" |
7a292a7a | 36 | #include "top.h" |
2acceee2 | 37 | #include "inf-loop.h" |
4e052eda | 38 | #include "regcache.h" |
fd0407d6 | 39 | #include "value.h" |
76727919 | 40 | #include "observable.h" |
f636b87d | 41 | #include "language.h" |
a77053c2 | 42 | #include "solib.h" |
f17517ea | 43 | #include "main.h" |
186c406b | 44 | #include "block.h" |
034dad6f | 45 | #include "mi/mi-common.h" |
4f8d22e3 | 46 | #include "event-top.h" |
96429cc8 | 47 | #include "record.h" |
d02ed0bb | 48 | #include "record-full.h" |
edb3359d | 49 | #include "inline-frame.h" |
4efc6507 | 50 | #include "jit.h" |
06cd862c | 51 | #include "tracepoint.h" |
1bfeeb0f | 52 | #include "skip.h" |
28106bc2 SDJ |
53 | #include "probe.h" |
54 | #include "objfiles.h" | |
de0bea00 | 55 | #include "completer.h" |
9107fc8d | 56 | #include "target-descriptions.h" |
f15cb84a | 57 | #include "target-dcache.h" |
d83ad864 | 58 | #include "terminal.h" |
ff862be4 | 59 | #include "solist.h" |
400b5eca | 60 | #include "gdbsupport/event-loop.h" |
243a9253 | 61 | #include "thread-fsm.h" |
268a13a5 | 62 | #include "gdbsupport/enum-flags.h" |
5ed8105e | 63 | #include "progspace-and-thread.h" |
268a13a5 | 64 | #include "gdbsupport/gdb_optional.h" |
46a62268 | 65 | #include "arch-utils.h" |
268a13a5 TT |
66 | #include "gdbsupport/scope-exit.h" |
67 | #include "gdbsupport/forward-scope-exit.h" | |
06cc9596 | 68 | #include "gdbsupport/gdb_select.h" |
5b6d1e4f | 69 | #include <unordered_map> |
93b54c8e | 70 | #include "async-event.h" |
b161a60d SM |
71 | #include "gdbsupport/selftest.h" |
72 | #include "scoped-mock-context.h" | |
73 | #include "test-target.h" | |
ba988419 | 74 | #include "gdbsupport/common-debug.h" |
c906108c SS |
75 | |
76 | /* Prototypes for local functions */ | |
77 | ||
2ea28649 | 78 | static void sig_print_info (enum gdb_signal); |
c906108c | 79 | |
96baa820 | 80 | static void sig_print_header (void); |
c906108c | 81 | |
d83ad864 DB |
82 | static void follow_inferior_reset_breakpoints (void); |
83 | ||
c4464ade | 84 | static bool currently_stepping (struct thread_info *tp); |
a289b8f6 | 85 | |
2c03e5be | 86 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
87 | |
88 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
89 | ||
2484c66b UW |
90 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
91 | ||
c4464ade | 92 | static bool maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
8550d3b3 | 93 | |
aff4e175 AB |
94 | static void resume (gdb_signal sig); |
95 | ||
5b6d1e4f PA |
96 | static void wait_for_inferior (inferior *inf); |
97 | ||
372316f1 PA |
98 | /* Asynchronous signal handler registered as event loop source for |
99 | when we have pending events ready to be passed to the core. */ | |
100 | static struct async_event_handler *infrun_async_inferior_event_token; | |
101 | ||
102 | /* Stores whether infrun_async was previously enabled or disabled. | |
103 | Starts off as -1, indicating "never enabled/disabled". */ | |
104 | static int infrun_is_async = -1; | |
105 | ||
106 | /* See infrun.h. */ | |
107 | ||
108 | void | |
109 | infrun_async (int enable) | |
110 | { | |
111 | if (infrun_is_async != enable) | |
112 | { | |
113 | infrun_is_async = enable; | |
114 | ||
1eb8556f | 115 | infrun_debug_printf ("enable=%d", enable); |
372316f1 PA |
116 | |
117 | if (enable) | |
118 | mark_async_event_handler (infrun_async_inferior_event_token); | |
119 | else | |
120 | clear_async_event_handler (infrun_async_inferior_event_token); | |
121 | } | |
122 | } | |
123 | ||
0b333c5e PA |
124 | /* See infrun.h. */ |
125 | ||
126 | void | |
127 | mark_infrun_async_event_handler (void) | |
128 | { | |
129 | mark_async_event_handler (infrun_async_inferior_event_token); | |
130 | } | |
131 | ||
5fbbeb29 CF |
132 | /* When set, stop the 'step' command if we enter a function which has |
133 | no line number information. The normal behavior is that we step | |
134 | over such function. */ | |
491144b5 | 135 | bool step_stop_if_no_debug = false; |
920d2a44 AC |
136 | static void |
137 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
138 | struct cmd_list_element *c, const char *value) | |
139 | { | |
140 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
141 | } | |
5fbbeb29 | 142 | |
b9f437de PA |
143 | /* proceed and normal_stop use this to notify the user when the |
144 | inferior stopped in a different thread than it had been running | |
145 | in. */ | |
96baa820 | 146 | |
39f77062 | 147 | static ptid_t previous_inferior_ptid; |
7a292a7a | 148 | |
07107ca6 LM |
149 | /* If set (default for legacy reasons), when following a fork, GDB |
150 | will detach from one of the fork branches, child or parent. | |
151 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
152 | setting. */ | |
153 | ||
491144b5 | 154 | static bool detach_fork = true; |
6c95b8df | 155 | |
94ba44a6 | 156 | bool debug_infrun = false; |
920d2a44 AC |
157 | static void |
158 | show_debug_infrun (struct ui_file *file, int from_tty, | |
159 | struct cmd_list_element *c, const char *value) | |
160 | { | |
161 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
162 | } | |
527159b7 | 163 | |
03583c20 UW |
164 | /* Support for disabling address space randomization. */ |
165 | ||
491144b5 | 166 | bool disable_randomization = true; |
03583c20 UW |
167 | |
168 | static void | |
169 | show_disable_randomization (struct ui_file *file, int from_tty, | |
170 | struct cmd_list_element *c, const char *value) | |
171 | { | |
172 | if (target_supports_disable_randomization ()) | |
173 | fprintf_filtered (file, | |
174 | _("Disabling randomization of debuggee's " | |
175 | "virtual address space is %s.\n"), | |
176 | value); | |
177 | else | |
178 | fputs_filtered (_("Disabling randomization of debuggee's " | |
179 | "virtual address space is unsupported on\n" | |
180 | "this platform.\n"), file); | |
181 | } | |
182 | ||
183 | static void | |
eb4c3f4a | 184 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
185 | struct cmd_list_element *c) |
186 | { | |
187 | if (!target_supports_disable_randomization ()) | |
188 | error (_("Disabling randomization of debuggee's " | |
189 | "virtual address space is unsupported on\n" | |
190 | "this platform.")); | |
191 | } | |
192 | ||
d32dc48e PA |
193 | /* User interface for non-stop mode. */ |
194 | ||
491144b5 CB |
195 | bool non_stop = false; |
196 | static bool non_stop_1 = false; | |
d32dc48e PA |
197 | |
198 | static void | |
eb4c3f4a | 199 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
200 | struct cmd_list_element *c) |
201 | { | |
55f6301a | 202 | if (target_has_execution ()) |
d32dc48e PA |
203 | { |
204 | non_stop_1 = non_stop; | |
205 | error (_("Cannot change this setting while the inferior is running.")); | |
206 | } | |
207 | ||
208 | non_stop = non_stop_1; | |
209 | } | |
210 | ||
211 | static void | |
212 | show_non_stop (struct ui_file *file, int from_tty, | |
213 | struct cmd_list_element *c, const char *value) | |
214 | { | |
215 | fprintf_filtered (file, | |
216 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
217 | value); | |
218 | } | |
219 | ||
d914c394 SS |
220 | /* "Observer mode" is somewhat like a more extreme version of |
221 | non-stop, in which all GDB operations that might affect the | |
222 | target's execution have been disabled. */ | |
223 | ||
6bd434d6 | 224 | static bool observer_mode = false; |
491144b5 | 225 | static bool observer_mode_1 = false; |
d914c394 SS |
226 | |
227 | static void | |
eb4c3f4a | 228 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
229 | struct cmd_list_element *c) |
230 | { | |
55f6301a | 231 | if (target_has_execution ()) |
d914c394 SS |
232 | { |
233 | observer_mode_1 = observer_mode; | |
234 | error (_("Cannot change this setting while the inferior is running.")); | |
235 | } | |
236 | ||
237 | observer_mode = observer_mode_1; | |
238 | ||
239 | may_write_registers = !observer_mode; | |
240 | may_write_memory = !observer_mode; | |
241 | may_insert_breakpoints = !observer_mode; | |
242 | may_insert_tracepoints = !observer_mode; | |
243 | /* We can insert fast tracepoints in or out of observer mode, | |
244 | but enable them if we're going into this mode. */ | |
245 | if (observer_mode) | |
491144b5 | 246 | may_insert_fast_tracepoints = true; |
d914c394 SS |
247 | may_stop = !observer_mode; |
248 | update_target_permissions (); | |
249 | ||
250 | /* Going *into* observer mode we must force non-stop, then | |
251 | going out we leave it that way. */ | |
252 | if (observer_mode) | |
253 | { | |
d914c394 | 254 | pagination_enabled = 0; |
491144b5 | 255 | non_stop = non_stop_1 = true; |
d914c394 SS |
256 | } |
257 | ||
258 | if (from_tty) | |
259 | printf_filtered (_("Observer mode is now %s.\n"), | |
260 | (observer_mode ? "on" : "off")); | |
261 | } | |
262 | ||
263 | static void | |
264 | show_observer_mode (struct ui_file *file, int from_tty, | |
265 | struct cmd_list_element *c, const char *value) | |
266 | { | |
267 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
268 | } | |
269 | ||
270 | /* This updates the value of observer mode based on changes in | |
271 | permissions. Note that we are deliberately ignoring the values of | |
272 | may-write-registers and may-write-memory, since the user may have | |
273 | reason to enable these during a session, for instance to turn on a | |
274 | debugging-related global. */ | |
275 | ||
276 | void | |
277 | update_observer_mode (void) | |
278 | { | |
491144b5 CB |
279 | bool newval = (!may_insert_breakpoints |
280 | && !may_insert_tracepoints | |
281 | && may_insert_fast_tracepoints | |
282 | && !may_stop | |
283 | && non_stop); | |
d914c394 SS |
284 | |
285 | /* Let the user know if things change. */ | |
286 | if (newval != observer_mode) | |
287 | printf_filtered (_("Observer mode is now %s.\n"), | |
288 | (newval ? "on" : "off")); | |
289 | ||
290 | observer_mode = observer_mode_1 = newval; | |
291 | } | |
c2c6d25f | 292 | |
c906108c SS |
293 | /* Tables of how to react to signals; the user sets them. */ |
294 | ||
adc6a863 PA |
295 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
296 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
297 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 298 | |
ab04a2af TT |
299 | /* Table of signals that are registered with "catch signal". A |
300 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
301 | signal" command. */ |
302 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 303 | |
2455069d UW |
304 | /* Table of signals that the target may silently handle. |
305 | This is automatically determined from the flags above, | |
306 | and simply cached here. */ | |
adc6a863 | 307 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 308 | |
c906108c SS |
309 | #define SET_SIGS(nsigs,sigs,flags) \ |
310 | do { \ | |
311 | int signum = (nsigs); \ | |
312 | while (signum-- > 0) \ | |
313 | if ((sigs)[signum]) \ | |
314 | (flags)[signum] = 1; \ | |
315 | } while (0) | |
316 | ||
317 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
318 | do { \ | |
319 | int signum = (nsigs); \ | |
320 | while (signum-- > 0) \ | |
321 | if ((sigs)[signum]) \ | |
322 | (flags)[signum] = 0; \ | |
323 | } while (0) | |
324 | ||
9b224c5e PA |
325 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
326 | this function is to avoid exporting `signal_program'. */ | |
327 | ||
328 | void | |
329 | update_signals_program_target (void) | |
330 | { | |
adc6a863 | 331 | target_program_signals (signal_program); |
9b224c5e PA |
332 | } |
333 | ||
1777feb0 | 334 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 335 | |
edb3359d | 336 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
337 | |
338 | /* Command list pointer for the "stop" placeholder. */ | |
339 | ||
340 | static struct cmd_list_element *stop_command; | |
341 | ||
c906108c SS |
342 | /* Nonzero if we want to give control to the user when we're notified |
343 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 344 | int stop_on_solib_events; |
f9e14852 GB |
345 | |
346 | /* Enable or disable optional shared library event breakpoints | |
347 | as appropriate when the above flag is changed. */ | |
348 | ||
349 | static void | |
eb4c3f4a TT |
350 | set_stop_on_solib_events (const char *args, |
351 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
352 | { |
353 | update_solib_breakpoints (); | |
354 | } | |
355 | ||
920d2a44 AC |
356 | static void |
357 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
358 | struct cmd_list_element *c, const char *value) | |
359 | { | |
360 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
361 | value); | |
362 | } | |
c906108c | 363 | |
c4464ade | 364 | /* True after stop if current stack frame should be printed. */ |
c906108c | 365 | |
c4464ade | 366 | static bool stop_print_frame; |
c906108c | 367 | |
5b6d1e4f PA |
368 | /* This is a cached copy of the target/ptid/waitstatus of the last |
369 | event returned by target_wait()/deprecated_target_wait_hook(). | |
370 | This information is returned by get_last_target_status(). */ | |
371 | static process_stratum_target *target_last_proc_target; | |
39f77062 | 372 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
373 | static struct target_waitstatus target_last_waitstatus; |
374 | ||
4e1c45ea | 375 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 376 | |
53904c9e AC |
377 | static const char follow_fork_mode_child[] = "child"; |
378 | static const char follow_fork_mode_parent[] = "parent"; | |
379 | ||
40478521 | 380 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
381 | follow_fork_mode_child, |
382 | follow_fork_mode_parent, | |
383 | NULL | |
ef346e04 | 384 | }; |
c906108c | 385 | |
53904c9e | 386 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
387 | static void |
388 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
389 | struct cmd_list_element *c, const char *value) | |
390 | { | |
3e43a32a MS |
391 | fprintf_filtered (file, |
392 | _("Debugger response to a program " | |
393 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
394 | value); |
395 | } | |
c906108c SS |
396 | \f |
397 | ||
d83ad864 DB |
398 | /* Handle changes to the inferior list based on the type of fork, |
399 | which process is being followed, and whether the other process | |
400 | should be detached. On entry inferior_ptid must be the ptid of | |
401 | the fork parent. At return inferior_ptid is the ptid of the | |
402 | followed inferior. */ | |
403 | ||
5ab2fbf1 SM |
404 | static bool |
405 | follow_fork_inferior (bool follow_child, bool detach_fork) | |
d83ad864 DB |
406 | { |
407 | int has_vforked; | |
79639e11 | 408 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
409 | |
410 | has_vforked = (inferior_thread ()->pending_follow.kind | |
411 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
412 | parent_ptid = inferior_ptid; |
413 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
414 | |
415 | if (has_vforked | |
416 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 417 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
418 | && !(follow_child || detach_fork || sched_multi)) |
419 | { | |
420 | /* The parent stays blocked inside the vfork syscall until the | |
421 | child execs or exits. If we don't let the child run, then | |
422 | the parent stays blocked. If we're telling the parent to run | |
423 | in the foreground, the user will not be able to ctrl-c to get | |
424 | back the terminal, effectively hanging the debug session. */ | |
425 | fprintf_filtered (gdb_stderr, _("\ | |
426 | Can not resume the parent process over vfork in the foreground while\n\ | |
427 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
428 | \"set schedule-multiple\".\n")); | |
e97007b6 | 429 | return true; |
d83ad864 DB |
430 | } |
431 | ||
432 | if (!follow_child) | |
433 | { | |
434 | /* Detach new forked process? */ | |
435 | if (detach_fork) | |
436 | { | |
d83ad864 DB |
437 | /* Before detaching from the child, remove all breakpoints |
438 | from it. If we forked, then this has already been taken | |
439 | care of by infrun.c. If we vforked however, any | |
440 | breakpoint inserted in the parent is visible in the | |
441 | child, even those added while stopped in a vfork | |
442 | catchpoint. This will remove the breakpoints from the | |
443 | parent also, but they'll be reinserted below. */ | |
444 | if (has_vforked) | |
445 | { | |
446 | /* Keep breakpoints list in sync. */ | |
00431a78 | 447 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
448 | } |
449 | ||
f67c0c91 | 450 | if (print_inferior_events) |
d83ad864 | 451 | { |
8dd06f7a | 452 | /* Ensure that we have a process ptid. */ |
e99b03dc | 453 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 454 | |
223ffa71 | 455 | target_terminal::ours_for_output (); |
d83ad864 | 456 | fprintf_filtered (gdb_stdlog, |
f67c0c91 | 457 | _("[Detaching after %s from child %s]\n"), |
6f259a23 | 458 | has_vforked ? "vfork" : "fork", |
a068643d | 459 | target_pid_to_str (process_ptid).c_str ()); |
d83ad864 DB |
460 | } |
461 | } | |
462 | else | |
463 | { | |
464 | struct inferior *parent_inf, *child_inf; | |
d83ad864 DB |
465 | |
466 | /* Add process to GDB's tables. */ | |
e99b03dc | 467 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
468 | |
469 | parent_inf = current_inferior (); | |
470 | child_inf->attach_flag = parent_inf->attach_flag; | |
471 | copy_terminal_info (child_inf, parent_inf); | |
472 | child_inf->gdbarch = parent_inf->gdbarch; | |
473 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
474 | ||
5ed8105e | 475 | scoped_restore_current_pspace_and_thread restore_pspace_thread; |
d83ad864 | 476 | |
2a00d7ce | 477 | set_current_inferior (child_inf); |
5b6d1e4f | 478 | switch_to_no_thread (); |
d83ad864 | 479 | child_inf->symfile_flags = SYMFILE_NO_READ; |
02980c56 | 480 | child_inf->push_target (parent_inf->process_target ()); |
18493a00 PA |
481 | thread_info *child_thr |
482 | = add_thread_silent (child_inf->process_target (), child_ptid); | |
d83ad864 DB |
483 | |
484 | /* If this is a vfork child, then the address-space is | |
485 | shared with the parent. */ | |
486 | if (has_vforked) | |
487 | { | |
488 | child_inf->pspace = parent_inf->pspace; | |
489 | child_inf->aspace = parent_inf->aspace; | |
490 | ||
5b6d1e4f PA |
491 | exec_on_vfork (); |
492 | ||
d83ad864 DB |
493 | /* The parent will be frozen until the child is done |
494 | with the shared region. Keep track of the | |
495 | parent. */ | |
496 | child_inf->vfork_parent = parent_inf; | |
497 | child_inf->pending_detach = 0; | |
498 | parent_inf->vfork_child = child_inf; | |
499 | parent_inf->pending_detach = 0; | |
18493a00 PA |
500 | |
501 | /* Now that the inferiors and program spaces are all | |
502 | wired up, we can switch to the child thread (which | |
503 | switches inferior and program space too). */ | |
504 | switch_to_thread (child_thr); | |
d83ad864 DB |
505 | } |
506 | else | |
507 | { | |
508 | child_inf->aspace = new_address_space (); | |
564b1e3f | 509 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
510 | child_inf->removable = 1; |
511 | set_current_program_space (child_inf->pspace); | |
512 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
513 | ||
18493a00 PA |
514 | /* solib_create_inferior_hook relies on the current |
515 | thread. */ | |
516 | switch_to_thread (child_thr); | |
517 | ||
d83ad864 DB |
518 | /* Let the shared library layer (e.g., solib-svr4) learn |
519 | about this new process, relocate the cloned exec, pull | |
520 | in shared libraries, and install the solib event | |
521 | breakpoint. If a "cloned-VM" event was propagated | |
522 | better throughout the core, this wouldn't be | |
523 | required. */ | |
122373f7 SM |
524 | scoped_restore restore_in_initial_library_scan |
525 | = make_scoped_restore (&child_inf->in_initial_library_scan, | |
526 | true); | |
d83ad864 DB |
527 | solib_create_inferior_hook (0); |
528 | } | |
d83ad864 DB |
529 | } |
530 | ||
531 | if (has_vforked) | |
532 | { | |
533 | struct inferior *parent_inf; | |
534 | ||
535 | parent_inf = current_inferior (); | |
536 | ||
537 | /* If we detached from the child, then we have to be careful | |
538 | to not insert breakpoints in the parent until the child | |
539 | is done with the shared memory region. However, if we're | |
540 | staying attached to the child, then we can and should | |
541 | insert breakpoints, so that we can debug it. A | |
542 | subsequent child exec or exit is enough to know when does | |
543 | the child stops using the parent's address space. */ | |
544 | parent_inf->waiting_for_vfork_done = detach_fork; | |
545 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
546 | } | |
547 | } | |
548 | else | |
549 | { | |
550 | /* Follow the child. */ | |
551 | struct inferior *parent_inf, *child_inf; | |
552 | struct program_space *parent_pspace; | |
553 | ||
f67c0c91 | 554 | if (print_inferior_events) |
d83ad864 | 555 | { |
f67c0c91 SDJ |
556 | std::string parent_pid = target_pid_to_str (parent_ptid); |
557 | std::string child_pid = target_pid_to_str (child_ptid); | |
558 | ||
223ffa71 | 559 | target_terminal::ours_for_output (); |
6f259a23 | 560 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
561 | _("[Attaching after %s %s to child %s]\n"), |
562 | parent_pid.c_str (), | |
6f259a23 | 563 | has_vforked ? "vfork" : "fork", |
f67c0c91 | 564 | child_pid.c_str ()); |
d83ad864 DB |
565 | } |
566 | ||
567 | /* Add the new inferior first, so that the target_detach below | |
568 | doesn't unpush the target. */ | |
569 | ||
e99b03dc | 570 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
571 | |
572 | parent_inf = current_inferior (); | |
573 | child_inf->attach_flag = parent_inf->attach_flag; | |
574 | copy_terminal_info (child_inf, parent_inf); | |
575 | child_inf->gdbarch = parent_inf->gdbarch; | |
576 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
577 | ||
578 | parent_pspace = parent_inf->pspace; | |
579 | ||
5b6d1e4f | 580 | process_stratum_target *target = parent_inf->process_target (); |
d83ad864 | 581 | |
5b6d1e4f PA |
582 | { |
583 | /* Hold a strong reference to the target while (maybe) | |
584 | detaching the parent. Otherwise detaching could close the | |
585 | target. */ | |
586 | auto target_ref = target_ops_ref::new_reference (target); | |
587 | ||
588 | /* If we're vforking, we want to hold on to the parent until | |
589 | the child exits or execs. At child exec or exit time we | |
590 | can remove the old breakpoints from the parent and detach | |
591 | or resume debugging it. Otherwise, detach the parent now; | |
592 | we'll want to reuse it's program/address spaces, but we | |
593 | can't set them to the child before removing breakpoints | |
594 | from the parent, otherwise, the breakpoints module could | |
595 | decide to remove breakpoints from the wrong process (since | |
596 | they'd be assigned to the same address space). */ | |
597 | ||
598 | if (has_vforked) | |
599 | { | |
600 | gdb_assert (child_inf->vfork_parent == NULL); | |
601 | gdb_assert (parent_inf->vfork_child == NULL); | |
602 | child_inf->vfork_parent = parent_inf; | |
603 | child_inf->pending_detach = 0; | |
604 | parent_inf->vfork_child = child_inf; | |
605 | parent_inf->pending_detach = detach_fork; | |
606 | parent_inf->waiting_for_vfork_done = 0; | |
607 | } | |
608 | else if (detach_fork) | |
609 | { | |
610 | if (print_inferior_events) | |
611 | { | |
612 | /* Ensure that we have a process ptid. */ | |
613 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
614 | ||
615 | target_terminal::ours_for_output (); | |
616 | fprintf_filtered (gdb_stdlog, | |
617 | _("[Detaching after fork from " | |
618 | "parent %s]\n"), | |
619 | target_pid_to_str (process_ptid).c_str ()); | |
620 | } | |
8dd06f7a | 621 | |
5b6d1e4f PA |
622 | target_detach (parent_inf, 0); |
623 | parent_inf = NULL; | |
624 | } | |
6f259a23 | 625 | |
5b6d1e4f | 626 | /* Note that the detach above makes PARENT_INF dangling. */ |
d83ad864 | 627 | |
5b6d1e4f PA |
628 | /* Add the child thread to the appropriate lists, and switch |
629 | to this new thread, before cloning the program space, and | |
630 | informing the solib layer about this new process. */ | |
d83ad864 | 631 | |
5b6d1e4f | 632 | set_current_inferior (child_inf); |
02980c56 | 633 | child_inf->push_target (target); |
5b6d1e4f | 634 | } |
d83ad864 | 635 | |
18493a00 | 636 | thread_info *child_thr = add_thread_silent (target, child_ptid); |
d83ad864 DB |
637 | |
638 | /* If this is a vfork child, then the address-space is shared | |
639 | with the parent. If we detached from the parent, then we can | |
640 | reuse the parent's program/address spaces. */ | |
641 | if (has_vforked || detach_fork) | |
642 | { | |
643 | child_inf->pspace = parent_pspace; | |
644 | child_inf->aspace = child_inf->pspace->aspace; | |
5b6d1e4f PA |
645 | |
646 | exec_on_vfork (); | |
d83ad864 DB |
647 | } |
648 | else | |
649 | { | |
650 | child_inf->aspace = new_address_space (); | |
564b1e3f | 651 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
652 | child_inf->removable = 1; |
653 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
654 | set_current_program_space (child_inf->pspace); | |
655 | clone_program_space (child_inf->pspace, parent_pspace); | |
656 | ||
657 | /* Let the shared library layer (e.g., solib-svr4) learn | |
658 | about this new process, relocate the cloned exec, pull in | |
659 | shared libraries, and install the solib event breakpoint. | |
660 | If a "cloned-VM" event was propagated better throughout | |
661 | the core, this wouldn't be required. */ | |
122373f7 SM |
662 | scoped_restore restore_in_initial_library_scan |
663 | = make_scoped_restore (&child_inf->in_initial_library_scan, true); | |
d83ad864 DB |
664 | solib_create_inferior_hook (0); |
665 | } | |
18493a00 PA |
666 | |
667 | switch_to_thread (child_thr); | |
d83ad864 DB |
668 | } |
669 | ||
e97007b6 SM |
670 | target_follow_fork (follow_child, detach_fork); |
671 | ||
672 | return false; | |
d83ad864 DB |
673 | } |
674 | ||
e58b0e63 PA |
675 | /* Tell the target to follow the fork we're stopped at. Returns true |
676 | if the inferior should be resumed; false, if the target for some | |
677 | reason decided it's best not to resume. */ | |
678 | ||
5ab2fbf1 SM |
679 | static bool |
680 | follow_fork () | |
c906108c | 681 | { |
5ab2fbf1 SM |
682 | bool follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
683 | bool should_resume = true; | |
e58b0e63 PA |
684 | struct thread_info *tp; |
685 | ||
686 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
687 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
688 | parent thread structure's run control related fields, not just these. |
689 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
690 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 691 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
692 | CORE_ADDR step_range_start = 0; |
693 | CORE_ADDR step_range_end = 0; | |
bf4cb9be TV |
694 | int current_line = 0; |
695 | symtab *current_symtab = NULL; | |
4e3990f4 | 696 | struct frame_id step_frame_id = { 0 }; |
8980e177 | 697 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
698 | |
699 | if (!non_stop) | |
700 | { | |
5b6d1e4f | 701 | process_stratum_target *wait_target; |
e58b0e63 PA |
702 | ptid_t wait_ptid; |
703 | struct target_waitstatus wait_status; | |
704 | ||
705 | /* Get the last target status returned by target_wait(). */ | |
5b6d1e4f | 706 | get_last_target_status (&wait_target, &wait_ptid, &wait_status); |
e58b0e63 PA |
707 | |
708 | /* If not stopped at a fork event, then there's nothing else to | |
709 | do. */ | |
710 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
711 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
712 | return 1; | |
713 | ||
714 | /* Check if we switched over from WAIT_PTID, since the event was | |
715 | reported. */ | |
00431a78 | 716 | if (wait_ptid != minus_one_ptid |
5b6d1e4f PA |
717 | && (current_inferior ()->process_target () != wait_target |
718 | || inferior_ptid != wait_ptid)) | |
e58b0e63 PA |
719 | { |
720 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
721 | target to follow it (in either direction). We'll | |
722 | afterwards refuse to resume, and inform the user what | |
723 | happened. */ | |
5b6d1e4f | 724 | thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid); |
00431a78 | 725 | switch_to_thread (wait_thread); |
5ab2fbf1 | 726 | should_resume = false; |
e58b0e63 PA |
727 | } |
728 | } | |
729 | ||
730 | tp = inferior_thread (); | |
731 | ||
732 | /* If there were any forks/vforks that were caught and are now to be | |
733 | followed, then do so now. */ | |
734 | switch (tp->pending_follow.kind) | |
735 | { | |
736 | case TARGET_WAITKIND_FORKED: | |
737 | case TARGET_WAITKIND_VFORKED: | |
738 | { | |
739 | ptid_t parent, child; | |
740 | ||
741 | /* If the user did a next/step, etc, over a fork call, | |
742 | preserve the stepping state in the fork child. */ | |
743 | if (follow_child && should_resume) | |
744 | { | |
8358c15c JK |
745 | step_resume_breakpoint = clone_momentary_breakpoint |
746 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
747 | step_range_start = tp->control.step_range_start; |
748 | step_range_end = tp->control.step_range_end; | |
bf4cb9be TV |
749 | current_line = tp->current_line; |
750 | current_symtab = tp->current_symtab; | |
16c381f0 | 751 | step_frame_id = tp->control.step_frame_id; |
186c406b TT |
752 | exception_resume_breakpoint |
753 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 754 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
755 | |
756 | /* For now, delete the parent's sr breakpoint, otherwise, | |
757 | parent/child sr breakpoints are considered duplicates, | |
758 | and the child version will not be installed. Remove | |
759 | this when the breakpoints module becomes aware of | |
760 | inferiors and address spaces. */ | |
761 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
762 | tp->control.step_range_start = 0; |
763 | tp->control.step_range_end = 0; | |
764 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 765 | delete_exception_resume_breakpoint (tp); |
8980e177 | 766 | tp->thread_fsm = NULL; |
e58b0e63 PA |
767 | } |
768 | ||
769 | parent = inferior_ptid; | |
770 | child = tp->pending_follow.value.related_pid; | |
771 | ||
5b6d1e4f | 772 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
773 | /* Set up inferior(s) as specified by the caller, and tell the |
774 | target to do whatever is necessary to follow either parent | |
775 | or child. */ | |
776 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
777 | { |
778 | /* Target refused to follow, or there's some other reason | |
779 | we shouldn't resume. */ | |
780 | should_resume = 0; | |
781 | } | |
782 | else | |
783 | { | |
784 | /* This pending follow fork event is now handled, one way | |
785 | or another. The previous selected thread may be gone | |
786 | from the lists by now, but if it is still around, need | |
787 | to clear the pending follow request. */ | |
5b6d1e4f | 788 | tp = find_thread_ptid (parent_targ, parent); |
e58b0e63 PA |
789 | if (tp) |
790 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
791 | ||
792 | /* This makes sure we don't try to apply the "Switched | |
793 | over from WAIT_PID" logic above. */ | |
794 | nullify_last_target_wait_ptid (); | |
795 | ||
1777feb0 | 796 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
797 | if (follow_child) |
798 | { | |
5b6d1e4f | 799 | thread_info *child_thr = find_thread_ptid (parent_targ, child); |
00431a78 | 800 | switch_to_thread (child_thr); |
e58b0e63 PA |
801 | |
802 | /* ... and preserve the stepping state, in case the | |
803 | user was stepping over the fork call. */ | |
804 | if (should_resume) | |
805 | { | |
806 | tp = inferior_thread (); | |
8358c15c JK |
807 | tp->control.step_resume_breakpoint |
808 | = step_resume_breakpoint; | |
16c381f0 JK |
809 | tp->control.step_range_start = step_range_start; |
810 | tp->control.step_range_end = step_range_end; | |
bf4cb9be TV |
811 | tp->current_line = current_line; |
812 | tp->current_symtab = current_symtab; | |
16c381f0 | 813 | tp->control.step_frame_id = step_frame_id; |
186c406b TT |
814 | tp->control.exception_resume_breakpoint |
815 | = exception_resume_breakpoint; | |
8980e177 | 816 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
817 | } |
818 | else | |
819 | { | |
820 | /* If we get here, it was because we're trying to | |
821 | resume from a fork catchpoint, but, the user | |
822 | has switched threads away from the thread that | |
823 | forked. In that case, the resume command | |
824 | issued is most likely not applicable to the | |
825 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 826 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 827 | "before following fork child.")); |
e58b0e63 PA |
828 | } |
829 | ||
830 | /* Reset breakpoints in the child as appropriate. */ | |
831 | follow_inferior_reset_breakpoints (); | |
832 | } | |
e58b0e63 PA |
833 | } |
834 | } | |
835 | break; | |
836 | case TARGET_WAITKIND_SPURIOUS: | |
837 | /* Nothing to follow. */ | |
838 | break; | |
839 | default: | |
840 | internal_error (__FILE__, __LINE__, | |
841 | "Unexpected pending_follow.kind %d\n", | |
842 | tp->pending_follow.kind); | |
843 | break; | |
844 | } | |
c906108c | 845 | |
e58b0e63 | 846 | return should_resume; |
c906108c SS |
847 | } |
848 | ||
d83ad864 | 849 | static void |
6604731b | 850 | follow_inferior_reset_breakpoints (void) |
c906108c | 851 | { |
4e1c45ea PA |
852 | struct thread_info *tp = inferior_thread (); |
853 | ||
6604731b DJ |
854 | /* Was there a step_resume breakpoint? (There was if the user |
855 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
856 | thread number. Cloned step_resume breakpoints are disabled on |
857 | creation, so enable it here now that it is associated with the | |
858 | correct thread. | |
6604731b DJ |
859 | |
860 | step_resumes are a form of bp that are made to be per-thread. | |
861 | Since we created the step_resume bp when the parent process | |
862 | was being debugged, and now are switching to the child process, | |
863 | from the breakpoint package's viewpoint, that's a switch of | |
864 | "threads". We must update the bp's notion of which thread | |
865 | it is for, or it'll be ignored when it triggers. */ | |
866 | ||
8358c15c | 867 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
868 | { |
869 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
870 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
871 | } | |
6604731b | 872 | |
a1aa2221 | 873 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 874 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
875 | { |
876 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
877 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
878 | } | |
186c406b | 879 | |
6604731b DJ |
880 | /* Reinsert all breakpoints in the child. The user may have set |
881 | breakpoints after catching the fork, in which case those | |
882 | were never set in the child, but only in the parent. This makes | |
883 | sure the inserted breakpoints match the breakpoint list. */ | |
884 | ||
885 | breakpoint_re_set (); | |
886 | insert_breakpoints (); | |
c906108c | 887 | } |
c906108c | 888 | |
6c95b8df PA |
889 | /* The child has exited or execed: resume threads of the parent the |
890 | user wanted to be executing. */ | |
891 | ||
892 | static int | |
893 | proceed_after_vfork_done (struct thread_info *thread, | |
894 | void *arg) | |
895 | { | |
896 | int pid = * (int *) arg; | |
897 | ||
00431a78 PA |
898 | if (thread->ptid.pid () == pid |
899 | && thread->state == THREAD_RUNNING | |
900 | && !thread->executing | |
6c95b8df | 901 | && !thread->stop_requested |
a493e3e2 | 902 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df | 903 | { |
1eb8556f SM |
904 | infrun_debug_printf ("resuming vfork parent thread %s", |
905 | target_pid_to_str (thread->ptid).c_str ()); | |
6c95b8df | 906 | |
00431a78 | 907 | switch_to_thread (thread); |
70509625 | 908 | clear_proceed_status (0); |
64ce06e4 | 909 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
910 | } |
911 | ||
912 | return 0; | |
913 | } | |
914 | ||
915 | /* Called whenever we notice an exec or exit event, to handle | |
916 | detaching or resuming a vfork parent. */ | |
917 | ||
918 | static void | |
919 | handle_vfork_child_exec_or_exit (int exec) | |
920 | { | |
921 | struct inferior *inf = current_inferior (); | |
922 | ||
923 | if (inf->vfork_parent) | |
924 | { | |
925 | int resume_parent = -1; | |
926 | ||
927 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
928 | between the parent and the child. Break the bonds. */ |
929 | inferior *vfork_parent = inf->vfork_parent; | |
930 | inf->vfork_parent->vfork_child = NULL; | |
931 | inf->vfork_parent = NULL; | |
6c95b8df | 932 | |
b73715df TV |
933 | /* If the user wanted to detach from the parent, now is the |
934 | time. */ | |
935 | if (vfork_parent->pending_detach) | |
6c95b8df | 936 | { |
6c95b8df PA |
937 | struct program_space *pspace; |
938 | struct address_space *aspace; | |
939 | ||
1777feb0 | 940 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 941 | |
b73715df | 942 | vfork_parent->pending_detach = 0; |
68c9da30 | 943 | |
18493a00 | 944 | scoped_restore_current_pspace_and_thread restore_thread; |
6c95b8df PA |
945 | |
946 | /* We're letting loose of the parent. */ | |
18493a00 | 947 | thread_info *tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 948 | switch_to_thread (tp); |
6c95b8df PA |
949 | |
950 | /* We're about to detach from the parent, which implicitly | |
951 | removes breakpoints from its address space. There's a | |
952 | catch here: we want to reuse the spaces for the child, | |
953 | but, parent/child are still sharing the pspace at this | |
954 | point, although the exec in reality makes the kernel give | |
955 | the child a fresh set of new pages. The problem here is | |
956 | that the breakpoints module being unaware of this, would | |
957 | likely chose the child process to write to the parent | |
958 | address space. Swapping the child temporarily away from | |
959 | the spaces has the desired effect. Yes, this is "sort | |
960 | of" a hack. */ | |
961 | ||
962 | pspace = inf->pspace; | |
963 | aspace = inf->aspace; | |
964 | inf->aspace = NULL; | |
965 | inf->pspace = NULL; | |
966 | ||
f67c0c91 | 967 | if (print_inferior_events) |
6c95b8df | 968 | { |
a068643d | 969 | std::string pidstr |
b73715df | 970 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 971 | |
223ffa71 | 972 | target_terminal::ours_for_output (); |
6c95b8df PA |
973 | |
974 | if (exec) | |
6f259a23 DB |
975 | { |
976 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 977 | _("[Detaching vfork parent %s " |
a068643d | 978 | "after child exec]\n"), pidstr.c_str ()); |
6f259a23 | 979 | } |
6c95b8df | 980 | else |
6f259a23 DB |
981 | { |
982 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 983 | _("[Detaching vfork parent %s " |
a068643d | 984 | "after child exit]\n"), pidstr.c_str ()); |
6f259a23 | 985 | } |
6c95b8df PA |
986 | } |
987 | ||
b73715df | 988 | target_detach (vfork_parent, 0); |
6c95b8df PA |
989 | |
990 | /* Put it back. */ | |
991 | inf->pspace = pspace; | |
992 | inf->aspace = aspace; | |
6c95b8df PA |
993 | } |
994 | else if (exec) | |
995 | { | |
996 | /* We're staying attached to the parent, so, really give the | |
997 | child a new address space. */ | |
564b1e3f | 998 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
999 | inf->aspace = inf->pspace->aspace; |
1000 | inf->removable = 1; | |
1001 | set_current_program_space (inf->pspace); | |
1002 | ||
b73715df | 1003 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1004 | } |
1005 | else | |
1006 | { | |
6c95b8df PA |
1007 | /* If this is a vfork child exiting, then the pspace and |
1008 | aspaces were shared with the parent. Since we're | |
1009 | reporting the process exit, we'll be mourning all that is | |
1010 | found in the address space, and switching to null_ptid, | |
1011 | preparing to start a new inferior. But, since we don't | |
1012 | want to clobber the parent's address/program spaces, we | |
1013 | go ahead and create a new one for this exiting | |
1014 | inferior. */ | |
1015 | ||
18493a00 | 1016 | /* Switch to no-thread while running clone_program_space, so |
5ed8105e PA |
1017 | that clone_program_space doesn't want to read the |
1018 | selected frame of a dead process. */ | |
18493a00 PA |
1019 | scoped_restore_current_thread restore_thread; |
1020 | switch_to_no_thread (); | |
6c95b8df | 1021 | |
53af73bf PA |
1022 | inf->pspace = new program_space (maybe_new_address_space ()); |
1023 | inf->aspace = inf->pspace->aspace; | |
1024 | set_current_program_space (inf->pspace); | |
6c95b8df | 1025 | inf->removable = 1; |
7dcd53a0 | 1026 | inf->symfile_flags = SYMFILE_NO_READ; |
53af73bf | 1027 | clone_program_space (inf->pspace, vfork_parent->pspace); |
6c95b8df | 1028 | |
b73715df | 1029 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1030 | } |
1031 | ||
6c95b8df PA |
1032 | gdb_assert (current_program_space == inf->pspace); |
1033 | ||
1034 | if (non_stop && resume_parent != -1) | |
1035 | { | |
1036 | /* If the user wanted the parent to be running, let it go | |
1037 | free now. */ | |
5ed8105e | 1038 | scoped_restore_current_thread restore_thread; |
6c95b8df | 1039 | |
1eb8556f SM |
1040 | infrun_debug_printf ("resuming vfork parent process %d", |
1041 | resume_parent); | |
6c95b8df PA |
1042 | |
1043 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1044 | } |
1045 | } | |
1046 | } | |
1047 | ||
eb6c553b | 1048 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1049 | |
1050 | static const char follow_exec_mode_new[] = "new"; | |
1051 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1052 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1053 | { |
1054 | follow_exec_mode_new, | |
1055 | follow_exec_mode_same, | |
1056 | NULL, | |
1057 | }; | |
1058 | ||
1059 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1060 | static void | |
1061 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1062 | struct cmd_list_element *c, const char *value) | |
1063 | { | |
1064 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1065 | } | |
1066 | ||
ecf45d2c | 1067 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1068 | |
c906108c | 1069 | static void |
4ca51187 | 1070 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1071 | { |
e99b03dc | 1072 | int pid = ptid.pid (); |
94585166 | 1073 | ptid_t process_ptid; |
7a292a7a | 1074 | |
65d2b333 PW |
1075 | /* Switch terminal for any messages produced e.g. by |
1076 | breakpoint_re_set. */ | |
1077 | target_terminal::ours_for_output (); | |
1078 | ||
c906108c SS |
1079 | /* This is an exec event that we actually wish to pay attention to. |
1080 | Refresh our symbol table to the newly exec'd program, remove any | |
1081 | momentary bp's, etc. | |
1082 | ||
1083 | If there are breakpoints, they aren't really inserted now, | |
1084 | since the exec() transformed our inferior into a fresh set | |
1085 | of instructions. | |
1086 | ||
1087 | We want to preserve symbolic breakpoints on the list, since | |
1088 | we have hopes that they can be reset after the new a.out's | |
1089 | symbol table is read. | |
1090 | ||
1091 | However, any "raw" breakpoints must be removed from the list | |
1092 | (e.g., the solib bp's), since their address is probably invalid | |
1093 | now. | |
1094 | ||
1095 | And, we DON'T want to call delete_breakpoints() here, since | |
1096 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1097 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1098 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1099 | |
1100 | mark_breakpoints_out (); | |
1101 | ||
95e50b27 PA |
1102 | /* The target reports the exec event to the main thread, even if |
1103 | some other thread does the exec, and even if the main thread was | |
1104 | stopped or already gone. We may still have non-leader threads of | |
1105 | the process on our list. E.g., on targets that don't have thread | |
1106 | exit events (like remote); or on native Linux in non-stop mode if | |
1107 | there were only two threads in the inferior and the non-leader | |
1108 | one is the one that execs (and nothing forces an update of the | |
1109 | thread list up to here). When debugging remotely, it's best to | |
1110 | avoid extra traffic, when possible, so avoid syncing the thread | |
1111 | list with the target, and instead go ahead and delete all threads | |
1112 | of the process but one that reported the event. Note this must | |
1113 | be done before calling update_breakpoints_after_exec, as | |
1114 | otherwise clearing the threads' resources would reference stale | |
1115 | thread breakpoints -- it may have been one of these threads that | |
1116 | stepped across the exec. We could just clear their stepping | |
1117 | states, but as long as we're iterating, might as well delete | |
1118 | them. Deleting them now rather than at the next user-visible | |
1119 | stop provides a nicer sequence of events for user and MI | |
1120 | notifications. */ | |
08036331 | 1121 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1122 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1123 | delete_thread (th); |
95e50b27 PA |
1124 | |
1125 | /* We also need to clear any left over stale state for the | |
1126 | leader/event thread. E.g., if there was any step-resume | |
1127 | breakpoint or similar, it's gone now. We cannot truly | |
1128 | step-to-next statement through an exec(). */ | |
08036331 | 1129 | thread_info *th = inferior_thread (); |
8358c15c | 1130 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1131 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1132 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1133 | th->control.step_range_start = 0; |
1134 | th->control.step_range_end = 0; | |
c906108c | 1135 | |
95e50b27 PA |
1136 | /* The user may have had the main thread held stopped in the |
1137 | previous image (e.g., schedlock on, or non-stop). Release | |
1138 | it now. */ | |
a75724bc PA |
1139 | th->stop_requested = 0; |
1140 | ||
95e50b27 PA |
1141 | update_breakpoints_after_exec (); |
1142 | ||
1777feb0 | 1143 | /* What is this a.out's name? */ |
f2907e49 | 1144 | process_ptid = ptid_t (pid); |
6c95b8df | 1145 | printf_unfiltered (_("%s is executing new program: %s\n"), |
a068643d | 1146 | target_pid_to_str (process_ptid).c_str (), |
ecf45d2c | 1147 | exec_file_target); |
c906108c SS |
1148 | |
1149 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1150 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1151 | |
6ca15a4b | 1152 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1153 | |
797bc1cb TT |
1154 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1155 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1156 | |
ecf45d2c SL |
1157 | /* If we were unable to map the executable target pathname onto a host |
1158 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1159 | is confusing. Maybe it would even be better to stop at this point | |
1160 | so that the user can specify a file manually before continuing. */ | |
1161 | if (exec_file_host == NULL) | |
1162 | warning (_("Could not load symbols for executable %s.\n" | |
1163 | "Do you need \"set sysroot\"?"), | |
1164 | exec_file_target); | |
c906108c | 1165 | |
cce9b6bf PA |
1166 | /* Reset the shared library package. This ensures that we get a |
1167 | shlib event when the child reaches "_start", at which point the | |
1168 | dld will have had a chance to initialize the child. */ | |
1169 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1170 | we don't want those to be satisfied by the libraries of the | |
1171 | previous incarnation of this process. */ | |
1172 | no_shared_libraries (NULL, 0); | |
1173 | ||
294c36eb SM |
1174 | struct inferior *inf = current_inferior (); |
1175 | ||
6c95b8df PA |
1176 | if (follow_exec_mode_string == follow_exec_mode_new) |
1177 | { | |
6c95b8df PA |
1178 | /* The user wants to keep the old inferior and program spaces |
1179 | around. Create a new fresh one, and switch to it. */ | |
1180 | ||
35ed81d4 SM |
1181 | /* Do exit processing for the original inferior before setting the new |
1182 | inferior's pid. Having two inferiors with the same pid would confuse | |
1183 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1184 | old to the new inferior. */ | |
294c36eb SM |
1185 | inferior *new_inferior = add_inferior_with_spaces (); |
1186 | ||
1187 | swap_terminal_info (new_inferior, inf); | |
1188 | exit_inferior_silent (inf); | |
1189 | ||
1190 | new_inferior->pid = pid; | |
1191 | target_follow_exec (new_inferior, ptid, exec_file_target); | |
1192 | ||
1193 | /* We continue with the new inferior. */ | |
1194 | inf = new_inferior; | |
6c95b8df | 1195 | } |
9107fc8d PA |
1196 | else |
1197 | { | |
1198 | /* The old description may no longer be fit for the new image. | |
1199 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1200 | old description; we'll read a new one below. No need to do | |
1201 | this on "follow-exec-mode new", as the old inferior stays | |
1202 | around (its description is later cleared/refetched on | |
1203 | restart). */ | |
1204 | target_clear_description (); | |
294c36eb | 1205 | target_follow_exec (inf, ptid, exec_file_target); |
9107fc8d | 1206 | } |
6c95b8df | 1207 | |
294c36eb | 1208 | gdb_assert (current_inferior () == inf); |
6c95b8df PA |
1209 | gdb_assert (current_program_space == inf->pspace); |
1210 | ||
ecf45d2c SL |
1211 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1212 | because the proper displacement for a PIE (Position Independent | |
1213 | Executable) main symbol file will only be computed by | |
1214 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1215 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1216 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1217 | |
9107fc8d PA |
1218 | /* If the target can specify a description, read it. Must do this |
1219 | after flipping to the new executable (because the target supplied | |
1220 | description must be compatible with the executable's | |
1221 | architecture, and the old executable may e.g., be 32-bit, while | |
1222 | the new one 64-bit), and before anything involving memory or | |
1223 | registers. */ | |
1224 | target_find_description (); | |
1225 | ||
42a4fec5 | 1226 | gdb::observers::inferior_execd.notify (inf); |
4efc6507 | 1227 | |
c1e56572 JK |
1228 | breakpoint_re_set (); |
1229 | ||
c906108c SS |
1230 | /* Reinsert all breakpoints. (Those which were symbolic have |
1231 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1232 | to symbol_file_command...). */ |
c906108c SS |
1233 | insert_breakpoints (); |
1234 | ||
1235 | /* The next resume of this inferior should bring it to the shlib | |
1236 | startup breakpoints. (If the user had also set bp's on | |
1237 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1238 | matically get reset there in the new process.). */ |
c906108c SS |
1239 | } |
1240 | ||
28d5518b | 1241 | /* The chain of threads that need to do a step-over operation to get |
c2829269 PA |
1242 | past e.g., a breakpoint. What technique is used to step over the |
1243 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1244 | same queue, to maintain rough temporal order of execution, in order | |
1245 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1246 | constantly stepping the same couple threads past their breakpoints | |
1247 | over and over, if the single-step finish fast enough. */ | |
28d5518b | 1248 | struct thread_info *global_thread_step_over_chain_head; |
c2829269 | 1249 | |
6c4cfb24 PA |
1250 | /* Bit flags indicating what the thread needs to step over. */ |
1251 | ||
8d297bbf | 1252 | enum step_over_what_flag |
6c4cfb24 PA |
1253 | { |
1254 | /* Step over a breakpoint. */ | |
1255 | STEP_OVER_BREAKPOINT = 1, | |
1256 | ||
1257 | /* Step past a non-continuable watchpoint, in order to let the | |
1258 | instruction execute so we can evaluate the watchpoint | |
1259 | expression. */ | |
1260 | STEP_OVER_WATCHPOINT = 2 | |
1261 | }; | |
8d297bbf | 1262 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1263 | |
963f9c80 | 1264 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1265 | |
1266 | struct step_over_info | |
1267 | { | |
963f9c80 PA |
1268 | /* If we're stepping past a breakpoint, this is the address space |
1269 | and address of the instruction the breakpoint is set at. We'll | |
1270 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1271 | non-NULL. */ | |
ac7d717c PA |
1272 | const address_space *aspace = nullptr; |
1273 | CORE_ADDR address = 0; | |
963f9c80 PA |
1274 | |
1275 | /* The instruction being stepped over triggers a nonsteppable | |
1276 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
ac7d717c | 1277 | int nonsteppable_watchpoint_p = 0; |
21edc42f YQ |
1278 | |
1279 | /* The thread's global number. */ | |
ac7d717c | 1280 | int thread = -1; |
31e77af2 PA |
1281 | }; |
1282 | ||
1283 | /* The step-over info of the location that is being stepped over. | |
1284 | ||
1285 | Note that with async/breakpoint always-inserted mode, a user might | |
1286 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1287 | being stepped over. As setting a new breakpoint inserts all | |
1288 | breakpoints, we need to make sure the breakpoint being stepped over | |
1289 | isn't inserted then. We do that by only clearing the step-over | |
1290 | info when the step-over is actually finished (or aborted). | |
1291 | ||
1292 | Presently GDB can only step over one breakpoint at any given time. | |
1293 | Given threads that can't run code in the same address space as the | |
1294 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1295 | to step-over at most one breakpoint per address space (so this info | |
1296 | could move to the address space object if/when GDB is extended). | |
1297 | The set of breakpoints being stepped over will normally be much | |
1298 | smaller than the set of all breakpoints, so a flag in the | |
1299 | breakpoint location structure would be wasteful. A separate list | |
1300 | also saves complexity and run-time, as otherwise we'd have to go | |
1301 | through all breakpoint locations clearing their flag whenever we | |
1302 | start a new sequence. Similar considerations weigh against storing | |
1303 | this info in the thread object. Plus, not all step overs actually | |
1304 | have breakpoint locations -- e.g., stepping past a single-step | |
1305 | breakpoint, or stepping to complete a non-continuable | |
1306 | watchpoint. */ | |
1307 | static struct step_over_info step_over_info; | |
1308 | ||
1309 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1310 | stepping over. |
1311 | N.B. We record the aspace and address now, instead of say just the thread, | |
1312 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1313 | |
1314 | static void | |
8b86c959 | 1315 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1316 | int nonsteppable_watchpoint_p, |
1317 | int thread) | |
31e77af2 PA |
1318 | { |
1319 | step_over_info.aspace = aspace; | |
1320 | step_over_info.address = address; | |
963f9c80 | 1321 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1322 | step_over_info.thread = thread; |
31e77af2 PA |
1323 | } |
1324 | ||
1325 | /* Called when we're not longer stepping over a breakpoint / an | |
1326 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1327 | ||
1328 | static void | |
1329 | clear_step_over_info (void) | |
1330 | { | |
1eb8556f | 1331 | infrun_debug_printf ("clearing step over info"); |
31e77af2 PA |
1332 | step_over_info.aspace = NULL; |
1333 | step_over_info.address = 0; | |
963f9c80 | 1334 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1335 | step_over_info.thread = -1; |
31e77af2 PA |
1336 | } |
1337 | ||
7f89fd65 | 1338 | /* See infrun.h. */ |
31e77af2 PA |
1339 | |
1340 | int | |
1341 | stepping_past_instruction_at (struct address_space *aspace, | |
1342 | CORE_ADDR address) | |
1343 | { | |
1344 | return (step_over_info.aspace != NULL | |
1345 | && breakpoint_address_match (aspace, address, | |
1346 | step_over_info.aspace, | |
1347 | step_over_info.address)); | |
1348 | } | |
1349 | ||
963f9c80 PA |
1350 | /* See infrun.h. */ |
1351 | ||
21edc42f YQ |
1352 | int |
1353 | thread_is_stepping_over_breakpoint (int thread) | |
1354 | { | |
1355 | return (step_over_info.thread != -1 | |
1356 | && thread == step_over_info.thread); | |
1357 | } | |
1358 | ||
1359 | /* See infrun.h. */ | |
1360 | ||
963f9c80 PA |
1361 | int |
1362 | stepping_past_nonsteppable_watchpoint (void) | |
1363 | { | |
1364 | return step_over_info.nonsteppable_watchpoint_p; | |
1365 | } | |
1366 | ||
6cc83d2a PA |
1367 | /* Returns true if step-over info is valid. */ |
1368 | ||
c4464ade | 1369 | static bool |
6cc83d2a PA |
1370 | step_over_info_valid_p (void) |
1371 | { | |
963f9c80 PA |
1372 | return (step_over_info.aspace != NULL |
1373 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1374 | } |
1375 | ||
c906108c | 1376 | \f |
237fc4c9 PA |
1377 | /* Displaced stepping. */ |
1378 | ||
1379 | /* In non-stop debugging mode, we must take special care to manage | |
1380 | breakpoints properly; in particular, the traditional strategy for | |
1381 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1382 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1383 | breakpoint it has hit while ensuring that other threads running | |
1384 | concurrently will hit the breakpoint as they should. | |
1385 | ||
1386 | The traditional way to step a thread T off a breakpoint in a | |
1387 | multi-threaded program in all-stop mode is as follows: | |
1388 | ||
1389 | a0) Initially, all threads are stopped, and breakpoints are not | |
1390 | inserted. | |
1391 | a1) We single-step T, leaving breakpoints uninserted. | |
1392 | a2) We insert breakpoints, and resume all threads. | |
1393 | ||
1394 | In non-stop debugging, however, this strategy is unsuitable: we | |
1395 | don't want to have to stop all threads in the system in order to | |
1396 | continue or step T past a breakpoint. Instead, we use displaced | |
1397 | stepping: | |
1398 | ||
1399 | n0) Initially, T is stopped, other threads are running, and | |
1400 | breakpoints are inserted. | |
1401 | n1) We copy the instruction "under" the breakpoint to a separate | |
1402 | location, outside the main code stream, making any adjustments | |
1403 | to the instruction, register, and memory state as directed by | |
1404 | T's architecture. | |
1405 | n2) We single-step T over the instruction at its new location. | |
1406 | n3) We adjust the resulting register and memory state as directed | |
1407 | by T's architecture. This includes resetting T's PC to point | |
1408 | back into the main instruction stream. | |
1409 | n4) We resume T. | |
1410 | ||
1411 | This approach depends on the following gdbarch methods: | |
1412 | ||
1413 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1414 | indicate where to copy the instruction, and how much space must | |
1415 | be reserved there. We use these in step n1. | |
1416 | ||
1417 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1418 | address, and makes any necessary adjustments to the instruction, | |
1419 | register contents, and memory. We use this in step n1. | |
1420 | ||
1421 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1422 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1423 | same effect the instruction would have had if we had executed it |
1424 | at its original address. We use this in step n3. | |
1425 | ||
237fc4c9 PA |
1426 | The gdbarch_displaced_step_copy_insn and |
1427 | gdbarch_displaced_step_fixup functions must be written so that | |
1428 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1429 | single-stepping across the copied instruction, and then applying | |
1430 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1431 | thread's memory and registers as stepping the instruction in place | |
1432 | would have. Exactly which responsibilities fall to the copy and | |
1433 | which fall to the fixup is up to the author of those functions. | |
1434 | ||
1435 | See the comments in gdbarch.sh for details. | |
1436 | ||
1437 | Note that displaced stepping and software single-step cannot | |
1438 | currently be used in combination, although with some care I think | |
1439 | they could be made to. Software single-step works by placing | |
1440 | breakpoints on all possible subsequent instructions; if the | |
1441 | displaced instruction is a PC-relative jump, those breakpoints | |
1442 | could fall in very strange places --- on pages that aren't | |
1443 | executable, or at addresses that are not proper instruction | |
1444 | boundaries. (We do generally let other threads run while we wait | |
1445 | to hit the software single-step breakpoint, and they might | |
1446 | encounter such a corrupted instruction.) One way to work around | |
1447 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1448 | simulate the effect of PC-relative instructions (and return NULL) | |
1449 | on architectures that use software single-stepping. | |
1450 | ||
1451 | In non-stop mode, we can have independent and simultaneous step | |
1452 | requests, so more than one thread may need to simultaneously step | |
1453 | over a breakpoint. The current implementation assumes there is | |
1454 | only one scratch space per process. In this case, we have to | |
1455 | serialize access to the scratch space. If thread A wants to step | |
1456 | over a breakpoint, but we are currently waiting for some other | |
1457 | thread to complete a displaced step, we leave thread A stopped and | |
1458 | place it in the displaced_step_request_queue. Whenever a displaced | |
1459 | step finishes, we pick the next thread in the queue and start a new | |
1460 | displaced step operation on it. See displaced_step_prepare and | |
7def77a1 | 1461 | displaced_step_finish for details. */ |
237fc4c9 | 1462 | |
a46d1843 | 1463 | /* Return true if THREAD is doing a displaced step. */ |
c0987663 | 1464 | |
c4464ade | 1465 | static bool |
00431a78 | 1466 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1467 | { |
00431a78 | 1468 | gdb_assert (thread != NULL); |
c0987663 | 1469 | |
187b041e | 1470 | return thread->displaced_step_state.in_progress (); |
c0987663 YQ |
1471 | } |
1472 | ||
a46d1843 | 1473 | /* Return true if INF has a thread doing a displaced step. */ |
8f572e5c | 1474 | |
c4464ade | 1475 | static bool |
00431a78 | 1476 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1477 | { |
187b041e | 1478 | return inf->displaced_step_state.in_progress_count > 0; |
fc1cf338 PA |
1479 | } |
1480 | ||
187b041e | 1481 | /* Return true if any thread is doing a displaced step. */ |
a42244db | 1482 | |
187b041e SM |
1483 | static bool |
1484 | displaced_step_in_progress_any_thread () | |
a42244db | 1485 | { |
187b041e SM |
1486 | for (inferior *inf : all_non_exited_inferiors ()) |
1487 | { | |
1488 | if (displaced_step_in_progress (inf)) | |
1489 | return true; | |
1490 | } | |
a42244db | 1491 | |
187b041e | 1492 | return false; |
a42244db YQ |
1493 | } |
1494 | ||
fc1cf338 PA |
1495 | static void |
1496 | infrun_inferior_exit (struct inferior *inf) | |
1497 | { | |
d20172fc | 1498 | inf->displaced_step_state.reset (); |
fc1cf338 | 1499 | } |
237fc4c9 | 1500 | |
3b7a962d SM |
1501 | static void |
1502 | infrun_inferior_execd (inferior *inf) | |
1503 | { | |
187b041e SM |
1504 | /* If some threads where was doing a displaced step in this inferior at the |
1505 | moment of the exec, they no longer exist. Even if the exec'ing thread | |
3b7a962d SM |
1506 | doing a displaced step, we don't want to to any fixup nor restore displaced |
1507 | stepping buffer bytes. */ | |
1508 | inf->displaced_step_state.reset (); | |
1509 | ||
187b041e SM |
1510 | for (thread_info *thread : inf->threads ()) |
1511 | thread->displaced_step_state.reset (); | |
1512 | ||
3b7a962d SM |
1513 | /* Since an in-line step is done with everything else stopped, if there was |
1514 | one in progress at the time of the exec, it must have been the exec'ing | |
1515 | thread. */ | |
1516 | clear_step_over_info (); | |
1517 | } | |
1518 | ||
fff08868 HZ |
1519 | /* If ON, and the architecture supports it, GDB will use displaced |
1520 | stepping to step over breakpoints. If OFF, or if the architecture | |
1521 | doesn't support it, GDB will instead use the traditional | |
1522 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1523 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1524 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1525 | |
72d0e2c5 | 1526 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1527 | |
237fc4c9 PA |
1528 | static void |
1529 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1530 | struct cmd_list_element *c, | |
1531 | const char *value) | |
1532 | { | |
72d0e2c5 | 1533 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1534 | fprintf_filtered (file, |
1535 | _("Debugger's willingness to use displaced stepping " | |
1536 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1537 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1538 | else |
3e43a32a MS |
1539 | fprintf_filtered (file, |
1540 | _("Debugger's willingness to use displaced stepping " | |
1541 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1542 | } |
1543 | ||
9822cb57 SM |
1544 | /* Return true if the gdbarch implements the required methods to use |
1545 | displaced stepping. */ | |
1546 | ||
1547 | static bool | |
1548 | gdbarch_supports_displaced_stepping (gdbarch *arch) | |
1549 | { | |
187b041e SM |
1550 | /* Only check for the presence of `prepare`. The gdbarch verification ensures |
1551 | that if `prepare` is provided, so is `finish`. */ | |
1552 | return gdbarch_displaced_step_prepare_p (arch); | |
9822cb57 SM |
1553 | } |
1554 | ||
fff08868 | 1555 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1556 | over breakpoints of thread TP. */ |
fff08868 | 1557 | |
9822cb57 SM |
1558 | static bool |
1559 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1560 | { |
9822cb57 SM |
1561 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1562 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1563 | return false; | |
1564 | ||
1565 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1566 | way. */ | |
1567 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1568 | && !target_is_non_stop_p ()) | |
1569 | return false; | |
1570 | ||
1571 | gdbarch *gdbarch = get_thread_regcache (tp)->arch (); | |
1572 | ||
1573 | /* If the architecture doesn't implement displaced stepping, don't use | |
1574 | it. */ | |
1575 | if (!gdbarch_supports_displaced_stepping (gdbarch)) | |
1576 | return false; | |
1577 | ||
1578 | /* If recording, don't use displaced stepping. */ | |
1579 | if (find_record_target () != nullptr) | |
1580 | return false; | |
1581 | ||
9822cb57 SM |
1582 | /* If displaced stepping failed before for this inferior, don't bother trying |
1583 | again. */ | |
f5f01699 | 1584 | if (tp->inf->displaced_step_state.failed_before) |
9822cb57 SM |
1585 | return false; |
1586 | ||
1587 | return true; | |
237fc4c9 PA |
1588 | } |
1589 | ||
187b041e | 1590 | /* Simple function wrapper around displaced_step_thread_state::reset. */ |
d8d83535 | 1591 | |
237fc4c9 | 1592 | static void |
187b041e | 1593 | displaced_step_reset (displaced_step_thread_state *displaced) |
237fc4c9 | 1594 | { |
d8d83535 | 1595 | displaced->reset (); |
237fc4c9 PA |
1596 | } |
1597 | ||
d8d83535 SM |
1598 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1599 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1600 | ||
1601 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 | 1602 | |
136821d9 SM |
1603 | /* See infrun.h. */ |
1604 | ||
1605 | std::string | |
1606 | displaced_step_dump_bytes (const gdb_byte *buf, size_t len) | |
237fc4c9 | 1607 | { |
136821d9 | 1608 | std::string ret; |
237fc4c9 | 1609 | |
136821d9 SM |
1610 | for (size_t i = 0; i < len; i++) |
1611 | { | |
1612 | if (i == 0) | |
1613 | ret += string_printf ("%02x", buf[i]); | |
1614 | else | |
1615 | ret += string_printf (" %02x", buf[i]); | |
1616 | } | |
1617 | ||
1618 | return ret; | |
237fc4c9 PA |
1619 | } |
1620 | ||
1621 | /* Prepare to single-step, using displaced stepping. | |
1622 | ||
1623 | Note that we cannot use displaced stepping when we have a signal to | |
1624 | deliver. If we have a signal to deliver and an instruction to step | |
1625 | over, then after the step, there will be no indication from the | |
1626 | target whether the thread entered a signal handler or ignored the | |
1627 | signal and stepped over the instruction successfully --- both cases | |
1628 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1629 | fixup, and in the second case we must --- but we can't tell which. | |
1630 | Comments in the code for 'random signals' in handle_inferior_event | |
1631 | explain how we handle this case instead. | |
1632 | ||
bab37966 SM |
1633 | Returns DISPLACED_STEP_PREPARE_STATUS_OK if preparing was successful -- this |
1634 | thread is going to be stepped now; DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE | |
1635 | if displaced stepping this thread got queued; or | |
1636 | DISPLACED_STEP_PREPARE_STATUS_CANT if this instruction can't be displaced | |
1637 | stepped. */ | |
7f03bd92 | 1638 | |
bab37966 | 1639 | static displaced_step_prepare_status |
00431a78 | 1640 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1641 | { |
00431a78 | 1642 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1643 | struct gdbarch *gdbarch = regcache->arch (); |
187b041e SM |
1644 | displaced_step_thread_state &disp_step_thread_state |
1645 | = tp->displaced_step_state; | |
237fc4c9 PA |
1646 | |
1647 | /* We should never reach this function if the architecture does not | |
1648 | support displaced stepping. */ | |
9822cb57 | 1649 | gdb_assert (gdbarch_supports_displaced_stepping (gdbarch)); |
237fc4c9 | 1650 | |
c2829269 PA |
1651 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1652 | gdb_assert (tp->control.trap_expected); | |
1653 | ||
c1e36e3e PA |
1654 | /* Disable range stepping while executing in the scratch pad. We |
1655 | want a single-step even if executing the displaced instruction in | |
1656 | the scratch buffer lands within the stepping range (e.g., a | |
1657 | jump/branch). */ | |
1658 | tp->control.may_range_step = 0; | |
1659 | ||
187b041e SM |
1660 | /* We are about to start a displaced step for this thread. If one is already |
1661 | in progress, something's wrong. */ | |
1662 | gdb_assert (!disp_step_thread_state.in_progress ()); | |
237fc4c9 | 1663 | |
187b041e | 1664 | if (tp->inf->displaced_step_state.unavailable) |
237fc4c9 | 1665 | { |
187b041e SM |
1666 | /* The gdbarch tells us it's not worth asking to try a prepare because |
1667 | it is likely that it will return unavailable, so don't bother asking. */ | |
237fc4c9 | 1668 | |
136821d9 SM |
1669 | displaced_debug_printf ("deferring step of %s", |
1670 | target_pid_to_str (tp->ptid).c_str ()); | |
237fc4c9 | 1671 | |
28d5518b | 1672 | global_thread_step_over_chain_enqueue (tp); |
bab37966 | 1673 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; |
237fc4c9 | 1674 | } |
237fc4c9 | 1675 | |
187b041e SM |
1676 | displaced_debug_printf ("displaced-stepping %s now", |
1677 | target_pid_to_str (tp->ptid).c_str ()); | |
237fc4c9 | 1678 | |
00431a78 PA |
1679 | scoped_restore_current_thread restore_thread; |
1680 | ||
1681 | switch_to_thread (tp); | |
ad53cd71 | 1682 | |
187b041e SM |
1683 | CORE_ADDR original_pc = regcache_read_pc (regcache); |
1684 | CORE_ADDR displaced_pc; | |
237fc4c9 | 1685 | |
187b041e SM |
1686 | displaced_step_prepare_status status |
1687 | = gdbarch_displaced_step_prepare (gdbarch, tp, displaced_pc); | |
237fc4c9 | 1688 | |
187b041e | 1689 | if (status == DISPLACED_STEP_PREPARE_STATUS_CANT) |
d35ae833 | 1690 | { |
187b041e SM |
1691 | displaced_debug_printf ("failed to prepare (%s)", |
1692 | target_pid_to_str (tp->ptid).c_str ()); | |
d35ae833 | 1693 | |
bab37966 | 1694 | return DISPLACED_STEP_PREPARE_STATUS_CANT; |
d35ae833 | 1695 | } |
187b041e | 1696 | else if (status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
7f03bd92 | 1697 | { |
187b041e SM |
1698 | /* Not enough displaced stepping resources available, defer this |
1699 | request by placing it the queue. */ | |
1700 | ||
1701 | displaced_debug_printf ("not enough resources available, " | |
1702 | "deferring step of %s", | |
1703 | target_pid_to_str (tp->ptid).c_str ()); | |
1704 | ||
1705 | global_thread_step_over_chain_enqueue (tp); | |
1706 | ||
1707 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; | |
7f03bd92 | 1708 | } |
237fc4c9 | 1709 | |
187b041e SM |
1710 | gdb_assert (status == DISPLACED_STEP_PREPARE_STATUS_OK); |
1711 | ||
9f5a595d UW |
1712 | /* Save the information we need to fix things up if the step |
1713 | succeeds. */ | |
187b041e | 1714 | disp_step_thread_state.set (gdbarch); |
9f5a595d | 1715 | |
187b041e | 1716 | tp->inf->displaced_step_state.in_progress_count++; |
ad53cd71 | 1717 | |
187b041e SM |
1718 | displaced_debug_printf ("prepared successfully thread=%s, " |
1719 | "original_pc=%s, displaced_pc=%s", | |
1720 | target_pid_to_str (tp->ptid).c_str (), | |
1721 | paddress (gdbarch, original_pc), | |
1722 | paddress (gdbarch, displaced_pc)); | |
237fc4c9 | 1723 | |
bab37966 | 1724 | return DISPLACED_STEP_PREPARE_STATUS_OK; |
237fc4c9 PA |
1725 | } |
1726 | ||
3fc8eb30 PA |
1727 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1728 | attempts at displaced stepping if we get a memory error. */ | |
1729 | ||
bab37966 | 1730 | static displaced_step_prepare_status |
00431a78 | 1731 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 | 1732 | { |
bab37966 SM |
1733 | displaced_step_prepare_status status |
1734 | = DISPLACED_STEP_PREPARE_STATUS_CANT; | |
3fc8eb30 | 1735 | |
a70b8144 | 1736 | try |
3fc8eb30 | 1737 | { |
bab37966 | 1738 | status = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1739 | } |
230d2906 | 1740 | catch (const gdb_exception_error &ex) |
3fc8eb30 | 1741 | { |
16b41842 PA |
1742 | if (ex.error != MEMORY_ERROR |
1743 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1744 | throw; |
3fc8eb30 | 1745 | |
1eb8556f SM |
1746 | infrun_debug_printf ("caught exception, disabling displaced stepping: %s", |
1747 | ex.what ()); | |
3fc8eb30 PA |
1748 | |
1749 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1750 | "auto". */ | |
1751 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1752 | { | |
fd7dcb94 | 1753 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1754 | ex.what ()); |
3fc8eb30 PA |
1755 | } |
1756 | ||
1757 | /* Disable further displaced stepping attempts. */ | |
f5f01699 | 1758 | thread->inf->displaced_step_state.failed_before = 1; |
3fc8eb30 | 1759 | } |
3fc8eb30 | 1760 | |
bab37966 | 1761 | return status; |
3fc8eb30 PA |
1762 | } |
1763 | ||
bab37966 SM |
1764 | /* If we displaced stepped an instruction successfully, adjust registers and |
1765 | memory to yield the same effect the instruction would have had if we had | |
1766 | executed it at its original address, and return | |
1767 | DISPLACED_STEP_FINISH_STATUS_OK. If the instruction didn't complete, | |
1768 | relocate the PC and return DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED. | |
372316f1 | 1769 | |
bab37966 SM |
1770 | If the thread wasn't displaced stepping, return |
1771 | DISPLACED_STEP_FINISH_STATUS_OK as well. */ | |
1772 | ||
1773 | static displaced_step_finish_status | |
7def77a1 | 1774 | displaced_step_finish (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1775 | { |
187b041e | 1776 | displaced_step_thread_state *displaced = &event_thread->displaced_step_state; |
fc1cf338 | 1777 | |
187b041e SM |
1778 | /* Was this thread performing a displaced step? */ |
1779 | if (!displaced->in_progress ()) | |
bab37966 | 1780 | return DISPLACED_STEP_FINISH_STATUS_OK; |
237fc4c9 | 1781 | |
187b041e SM |
1782 | gdb_assert (event_thread->inf->displaced_step_state.in_progress_count > 0); |
1783 | event_thread->inf->displaced_step_state.in_progress_count--; | |
1784 | ||
cb71640d PA |
1785 | /* Fixup may need to read memory/registers. Switch to the thread |
1786 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
d43b7a2d | 1787 | the current thread, and displaced_step_restore performs ptid-dependent |
328d42d8 | 1788 | memory accesses using current_inferior(). */ |
00431a78 | 1789 | switch_to_thread (event_thread); |
cb71640d | 1790 | |
d43b7a2d TBA |
1791 | displaced_step_reset_cleanup cleanup (displaced); |
1792 | ||
187b041e SM |
1793 | /* Do the fixup, and release the resources acquired to do the displaced |
1794 | step. */ | |
1795 | return gdbarch_displaced_step_finish (displaced->get_original_gdbarch (), | |
1796 | event_thread, signal); | |
c2829269 | 1797 | } |
1c5cfe86 | 1798 | |
4d9d9d04 PA |
1799 | /* Data to be passed around while handling an event. This data is |
1800 | discarded between events. */ | |
1801 | struct execution_control_state | |
1802 | { | |
5b6d1e4f | 1803 | process_stratum_target *target; |
4d9d9d04 PA |
1804 | ptid_t ptid; |
1805 | /* The thread that got the event, if this was a thread event; NULL | |
1806 | otherwise. */ | |
1807 | struct thread_info *event_thread; | |
1808 | ||
1809 | struct target_waitstatus ws; | |
1810 | int stop_func_filled_in; | |
1811 | CORE_ADDR stop_func_start; | |
1812 | CORE_ADDR stop_func_end; | |
1813 | const char *stop_func_name; | |
1814 | int wait_some_more; | |
1815 | ||
1816 | /* True if the event thread hit the single-step breakpoint of | |
1817 | another thread. Thus the event doesn't cause a stop, the thread | |
1818 | needs to be single-stepped past the single-step breakpoint before | |
1819 | we can switch back to the original stepping thread. */ | |
1820 | int hit_singlestep_breakpoint; | |
1821 | }; | |
1822 | ||
1823 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1824 | |
1825 | static void | |
4d9d9d04 PA |
1826 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1827 | { | |
1828 | memset (ecs, 0, sizeof (*ecs)); | |
1829 | ecs->event_thread = tp; | |
1830 | ecs->ptid = tp->ptid; | |
1831 | } | |
1832 | ||
1833 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1834 | static void prepare_to_wait (struct execution_control_state *ecs); | |
c4464ade | 1835 | static bool keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1836 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1837 | |
1838 | /* Are there any pending step-over requests? If so, run all we can | |
1839 | now and return true. Otherwise, return false. */ | |
1840 | ||
c4464ade | 1841 | static bool |
c2829269 PA |
1842 | start_step_over (void) |
1843 | { | |
3ec3145c SM |
1844 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
1845 | ||
187b041e | 1846 | thread_info *next; |
c2829269 | 1847 | |
372316f1 PA |
1848 | /* Don't start a new step-over if we already have an in-line |
1849 | step-over operation ongoing. */ | |
1850 | if (step_over_info_valid_p ()) | |
c4464ade | 1851 | return false; |
372316f1 | 1852 | |
187b041e SM |
1853 | /* Steal the global thread step over chain. As we try to initiate displaced |
1854 | steps, threads will be enqueued in the global chain if no buffers are | |
1855 | available. If we iterated on the global chain directly, we might iterate | |
1856 | indefinitely. */ | |
1857 | thread_info *threads_to_step = global_thread_step_over_chain_head; | |
1858 | global_thread_step_over_chain_head = NULL; | |
1859 | ||
1860 | infrun_debug_printf ("stealing global queue of threads to step, length = %d", | |
1861 | thread_step_over_chain_length (threads_to_step)); | |
1862 | ||
1863 | bool started = false; | |
1864 | ||
1865 | /* On scope exit (whatever the reason, return or exception), if there are | |
1866 | threads left in the THREADS_TO_STEP chain, put back these threads in the | |
1867 | global list. */ | |
1868 | SCOPE_EXIT | |
1869 | { | |
1870 | if (threads_to_step == nullptr) | |
1871 | infrun_debug_printf ("step-over queue now empty"); | |
1872 | else | |
1873 | { | |
1874 | infrun_debug_printf ("putting back %d threads to step in global queue", | |
1875 | thread_step_over_chain_length (threads_to_step)); | |
1876 | ||
1877 | global_thread_step_over_chain_enqueue_chain (threads_to_step); | |
1878 | } | |
1879 | }; | |
1880 | ||
1881 | for (thread_info *tp = threads_to_step; tp != NULL; tp = next) | |
237fc4c9 | 1882 | { |
4d9d9d04 PA |
1883 | struct execution_control_state ecss; |
1884 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1885 | step_over_what step_what; |
372316f1 | 1886 | int must_be_in_line; |
c2829269 | 1887 | |
c65d6b55 PA |
1888 | gdb_assert (!tp->stop_requested); |
1889 | ||
187b041e | 1890 | next = thread_step_over_chain_next (threads_to_step, tp); |
237fc4c9 | 1891 | |
187b041e SM |
1892 | if (tp->inf->displaced_step_state.unavailable) |
1893 | { | |
1894 | /* The arch told us to not even try preparing another displaced step | |
1895 | for this inferior. Just leave the thread in THREADS_TO_STEP, it | |
1896 | will get moved to the global chain on scope exit. */ | |
1897 | continue; | |
1898 | } | |
1899 | ||
1900 | /* Remove thread from the THREADS_TO_STEP chain. If anything goes wrong | |
1901 | while we try to prepare the displaced step, we don't add it back to | |
1902 | the global step over chain. This is to avoid a thread staying in the | |
1903 | step over chain indefinitely if something goes wrong when resuming it | |
1904 | If the error is intermittent and it still needs a step over, it will | |
1905 | get enqueued again when we try to resume it normally. */ | |
1906 | thread_step_over_chain_remove (&threads_to_step, tp); | |
c2829269 | 1907 | |
372316f1 PA |
1908 | step_what = thread_still_needs_step_over (tp); |
1909 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1910 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1911 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1912 | |
1913 | /* We currently stop all threads of all processes to step-over | |
1914 | in-line. If we need to start a new in-line step-over, let | |
1915 | any pending displaced steps finish first. */ | |
187b041e SM |
1916 | if (must_be_in_line && displaced_step_in_progress_any_thread ()) |
1917 | { | |
1918 | global_thread_step_over_chain_enqueue (tp); | |
1919 | continue; | |
1920 | } | |
c2829269 | 1921 | |
372316f1 PA |
1922 | if (tp->control.trap_expected |
1923 | || tp->resumed | |
1924 | || tp->executing) | |
ad53cd71 | 1925 | { |
4d9d9d04 PA |
1926 | internal_error (__FILE__, __LINE__, |
1927 | "[%s] has inconsistent state: " | |
372316f1 | 1928 | "trap_expected=%d, resumed=%d, executing=%d\n", |
a068643d | 1929 | target_pid_to_str (tp->ptid).c_str (), |
4d9d9d04 | 1930 | tp->control.trap_expected, |
372316f1 | 1931 | tp->resumed, |
4d9d9d04 | 1932 | tp->executing); |
ad53cd71 | 1933 | } |
1c5cfe86 | 1934 | |
1eb8556f SM |
1935 | infrun_debug_printf ("resuming [%s] for step-over", |
1936 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 PA |
1937 | |
1938 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
1939 | is no longer inserted. In all-stop, we want to keep looking | |
1940 | for a thread that needs a step-over instead of resuming TP, | |
1941 | because we wouldn't be able to resume anything else until the | |
1942 | target stops again. In non-stop, the resume always resumes | |
1943 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 1944 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 1945 | continue; |
8550d3b3 | 1946 | |
00431a78 | 1947 | switch_to_thread (tp); |
4d9d9d04 PA |
1948 | reset_ecs (ecs, tp); |
1949 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 1950 | |
4d9d9d04 PA |
1951 | if (!ecs->wait_some_more) |
1952 | error (_("Command aborted.")); | |
1c5cfe86 | 1953 | |
187b041e SM |
1954 | /* If the thread's step over could not be initiated because no buffers |
1955 | were available, it was re-added to the global step over chain. */ | |
1956 | if (tp->resumed) | |
1957 | { | |
1958 | infrun_debug_printf ("[%s] was resumed.", | |
1959 | target_pid_to_str (tp->ptid).c_str ()); | |
1960 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
1961 | } | |
1962 | else | |
1963 | { | |
1964 | infrun_debug_printf ("[%s] was NOT resumed.", | |
1965 | target_pid_to_str (tp->ptid).c_str ()); | |
1966 | gdb_assert (thread_is_in_step_over_chain (tp)); | |
1967 | } | |
372316f1 PA |
1968 | |
1969 | /* If we started a new in-line step-over, we're done. */ | |
1970 | if (step_over_info_valid_p ()) | |
1971 | { | |
1972 | gdb_assert (tp->control.trap_expected); | |
187b041e SM |
1973 | started = true; |
1974 | break; | |
372316f1 PA |
1975 | } |
1976 | ||
fbea99ea | 1977 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
1978 | { |
1979 | /* On all-stop, shouldn't have resumed unless we needed a | |
1980 | step over. */ | |
1981 | gdb_assert (tp->control.trap_expected | |
1982 | || tp->step_after_step_resume_breakpoint); | |
1983 | ||
1984 | /* With remote targets (at least), in all-stop, we can't | |
1985 | issue any further remote commands until the program stops | |
1986 | again. */ | |
187b041e SM |
1987 | started = true; |
1988 | break; | |
1c5cfe86 | 1989 | } |
c2829269 | 1990 | |
4d9d9d04 PA |
1991 | /* Either the thread no longer needed a step-over, or a new |
1992 | displaced stepping sequence started. Even in the latter | |
1993 | case, continue looking. Maybe we can also start another | |
1994 | displaced step on a thread of other process. */ | |
237fc4c9 | 1995 | } |
4d9d9d04 | 1996 | |
187b041e | 1997 | return started; |
237fc4c9 PA |
1998 | } |
1999 | ||
5231c1fd PA |
2000 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2001 | holding OLD_PTID. */ | |
2002 | static void | |
b161a60d SM |
2003 | infrun_thread_ptid_changed (process_stratum_target *target, |
2004 | ptid_t old_ptid, ptid_t new_ptid) | |
5231c1fd | 2005 | { |
b161a60d SM |
2006 | if (inferior_ptid == old_ptid |
2007 | && current_inferior ()->process_target () == target) | |
5231c1fd | 2008 | inferior_ptid = new_ptid; |
5231c1fd PA |
2009 | } |
2010 | ||
237fc4c9 | 2011 | \f |
c906108c | 2012 | |
53904c9e AC |
2013 | static const char schedlock_off[] = "off"; |
2014 | static const char schedlock_on[] = "on"; | |
2015 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2016 | static const char schedlock_replay[] = "replay"; |
40478521 | 2017 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2018 | schedlock_off, |
2019 | schedlock_on, | |
2020 | schedlock_step, | |
f2665db5 | 2021 | schedlock_replay, |
ef346e04 AC |
2022 | NULL |
2023 | }; | |
f2665db5 | 2024 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2025 | static void |
2026 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2027 | struct cmd_list_element *c, const char *value) | |
2028 | { | |
3e43a32a MS |
2029 | fprintf_filtered (file, |
2030 | _("Mode for locking scheduler " | |
2031 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2032 | value); |
2033 | } | |
c906108c SS |
2034 | |
2035 | static void | |
eb4c3f4a | 2036 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2037 | { |
8a3ecb79 | 2038 | if (!target_can_lock_scheduler ()) |
eefe576e AC |
2039 | { |
2040 | scheduler_mode = schedlock_off; | |
d777bf0d SM |
2041 | error (_("Target '%s' cannot support this command."), |
2042 | target_shortname ()); | |
eefe576e | 2043 | } |
c906108c SS |
2044 | } |
2045 | ||
d4db2f36 PA |
2046 | /* True if execution commands resume all threads of all processes by |
2047 | default; otherwise, resume only threads of the current inferior | |
2048 | process. */ | |
491144b5 | 2049 | bool sched_multi = false; |
d4db2f36 | 2050 | |
2facfe5c | 2051 | /* Try to setup for software single stepping over the specified location. |
c4464ade | 2052 | Return true if target_resume() should use hardware single step. |
2facfe5c DD |
2053 | |
2054 | GDBARCH the current gdbarch. | |
2055 | PC the location to step over. */ | |
2056 | ||
c4464ade | 2057 | static bool |
2facfe5c DD |
2058 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) |
2059 | { | |
c4464ade | 2060 | bool hw_step = true; |
2facfe5c | 2061 | |
f02253f1 | 2062 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2063 | && gdbarch_software_single_step_p (gdbarch)) |
2064 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2065 | ||
2facfe5c DD |
2066 | return hw_step; |
2067 | } | |
c906108c | 2068 | |
f3263aa4 PA |
2069 | /* See infrun.h. */ |
2070 | ||
09cee04b PA |
2071 | ptid_t |
2072 | user_visible_resume_ptid (int step) | |
2073 | { | |
f3263aa4 | 2074 | ptid_t resume_ptid; |
09cee04b | 2075 | |
09cee04b PA |
2076 | if (non_stop) |
2077 | { | |
2078 | /* With non-stop mode on, threads are always handled | |
2079 | individually. */ | |
2080 | resume_ptid = inferior_ptid; | |
2081 | } | |
2082 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2083 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2084 | { |
f3263aa4 PA |
2085 | /* User-settable 'scheduler' mode requires solo thread |
2086 | resume. */ | |
09cee04b PA |
2087 | resume_ptid = inferior_ptid; |
2088 | } | |
f2665db5 MM |
2089 | else if ((scheduler_mode == schedlock_replay) |
2090 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2091 | { | |
2092 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2093 | mode. */ | |
2094 | resume_ptid = inferior_ptid; | |
2095 | } | |
f3263aa4 PA |
2096 | else if (!sched_multi && target_supports_multi_process ()) |
2097 | { | |
2098 | /* Resume all threads of the current process (and none of other | |
2099 | processes). */ | |
e99b03dc | 2100 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2101 | } |
2102 | else | |
2103 | { | |
2104 | /* Resume all threads of all processes. */ | |
2105 | resume_ptid = RESUME_ALL; | |
2106 | } | |
09cee04b PA |
2107 | |
2108 | return resume_ptid; | |
2109 | } | |
2110 | ||
5b6d1e4f PA |
2111 | /* See infrun.h. */ |
2112 | ||
2113 | process_stratum_target * | |
2114 | user_visible_resume_target (ptid_t resume_ptid) | |
2115 | { | |
2116 | return (resume_ptid == minus_one_ptid && sched_multi | |
2117 | ? NULL | |
2118 | : current_inferior ()->process_target ()); | |
2119 | } | |
2120 | ||
fbea99ea PA |
2121 | /* Return a ptid representing the set of threads that we will resume, |
2122 | in the perspective of the target, assuming run control handling | |
2123 | does not require leaving some threads stopped (e.g., stepping past | |
2124 | breakpoint). USER_STEP indicates whether we're about to start the | |
2125 | target for a stepping command. */ | |
2126 | ||
2127 | static ptid_t | |
2128 | internal_resume_ptid (int user_step) | |
2129 | { | |
2130 | /* In non-stop, we always control threads individually. Note that | |
2131 | the target may always work in non-stop mode even with "set | |
2132 | non-stop off", in which case user_visible_resume_ptid could | |
2133 | return a wildcard ptid. */ | |
2134 | if (target_is_non_stop_p ()) | |
2135 | return inferior_ptid; | |
2136 | else | |
2137 | return user_visible_resume_ptid (user_step); | |
2138 | } | |
2139 | ||
64ce06e4 PA |
2140 | /* Wrapper for target_resume, that handles infrun-specific |
2141 | bookkeeping. */ | |
2142 | ||
2143 | static void | |
c4464ade | 2144 | do_target_resume (ptid_t resume_ptid, bool step, enum gdb_signal sig) |
64ce06e4 PA |
2145 | { |
2146 | struct thread_info *tp = inferior_thread (); | |
2147 | ||
c65d6b55 PA |
2148 | gdb_assert (!tp->stop_requested); |
2149 | ||
64ce06e4 | 2150 | /* Install inferior's terminal modes. */ |
223ffa71 | 2151 | target_terminal::inferior (); |
64ce06e4 PA |
2152 | |
2153 | /* Avoid confusing the next resume, if the next stop/resume | |
2154 | happens to apply to another thread. */ | |
2155 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2156 | ||
8f572e5c PA |
2157 | /* Advise target which signals may be handled silently. |
2158 | ||
2159 | If we have removed breakpoints because we are stepping over one | |
2160 | in-line (in any thread), we need to receive all signals to avoid | |
2161 | accidentally skipping a breakpoint during execution of a signal | |
2162 | handler. | |
2163 | ||
2164 | Likewise if we're displaced stepping, otherwise a trap for a | |
2165 | breakpoint in a signal handler might be confused with the | |
7def77a1 | 2166 | displaced step finishing. We don't make the displaced_step_finish |
8f572e5c PA |
2167 | step distinguish the cases instead, because: |
2168 | ||
2169 | - a backtrace while stopped in the signal handler would show the | |
2170 | scratch pad as frame older than the signal handler, instead of | |
2171 | the real mainline code. | |
2172 | ||
2173 | - when the thread is later resumed, the signal handler would | |
2174 | return to the scratch pad area, which would no longer be | |
2175 | valid. */ | |
2176 | if (step_over_info_valid_p () | |
00431a78 | 2177 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2178 | target_pass_signals ({}); |
64ce06e4 | 2179 | else |
adc6a863 | 2180 | target_pass_signals (signal_pass); |
64ce06e4 PA |
2181 | |
2182 | target_resume (resume_ptid, step, sig); | |
85ad3aaf | 2183 | |
5b6d1e4f PA |
2184 | if (target_can_async_p ()) |
2185 | target_async (1); | |
64ce06e4 PA |
2186 | } |
2187 | ||
d930703d | 2188 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2189 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2190 | call 'resume', which handles exceptions. */ | |
c906108c | 2191 | |
71d378ae PA |
2192 | static void |
2193 | resume_1 (enum gdb_signal sig) | |
c906108c | 2194 | { |
515630c5 | 2195 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2196 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2197 | struct thread_info *tp = inferior_thread (); |
8b86c959 | 2198 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2199 | ptid_t resume_ptid; |
856e7dd6 PA |
2200 | /* This represents the user's step vs continue request. When |
2201 | deciding whether "set scheduler-locking step" applies, it's the | |
2202 | user's intention that counts. */ | |
2203 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2204 | /* This represents what we'll actually request the target to do. |
2205 | This can decay from a step to a continue, if e.g., we need to | |
2206 | implement single-stepping with breakpoints (software | |
2207 | single-step). */ | |
c4464ade | 2208 | bool step; |
c7e8a53c | 2209 | |
c65d6b55 | 2210 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2211 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2212 | ||
372316f1 PA |
2213 | if (tp->suspend.waitstatus_pending_p) |
2214 | { | |
1eb8556f SM |
2215 | infrun_debug_printf |
2216 | ("thread %s has pending wait " | |
2217 | "status %s (currently_stepping=%d).", | |
2218 | target_pid_to_str (tp->ptid).c_str (), | |
2219 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2220 | currently_stepping (tp)); | |
372316f1 | 2221 | |
5b6d1e4f | 2222 | tp->inf->process_target ()->threads_executing = true; |
719546c4 | 2223 | tp->resumed = true; |
372316f1 PA |
2224 | |
2225 | /* FIXME: What should we do if we are supposed to resume this | |
2226 | thread with a signal? Maybe we should maintain a queue of | |
2227 | pending signals to deliver. */ | |
2228 | if (sig != GDB_SIGNAL_0) | |
2229 | { | |
fd7dcb94 | 2230 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d TT |
2231 | gdb_signal_to_name (sig), |
2232 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2233 | } |
2234 | ||
2235 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2236 | |
2237 | if (target_can_async_p ()) | |
9516f85a AB |
2238 | { |
2239 | target_async (1); | |
2240 | /* Tell the event loop we have an event to process. */ | |
2241 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2242 | } | |
372316f1 PA |
2243 | return; |
2244 | } | |
2245 | ||
2246 | tp->stepped_breakpoint = 0; | |
2247 | ||
6b403daa PA |
2248 | /* Depends on stepped_breakpoint. */ |
2249 | step = currently_stepping (tp); | |
2250 | ||
74609e71 YQ |
2251 | if (current_inferior ()->waiting_for_vfork_done) |
2252 | { | |
48f9886d PA |
2253 | /* Don't try to single-step a vfork parent that is waiting for |
2254 | the child to get out of the shared memory region (by exec'ing | |
2255 | or exiting). This is particularly important on software | |
2256 | single-step archs, as the child process would trip on the | |
2257 | software single step breakpoint inserted for the parent | |
2258 | process. Since the parent will not actually execute any | |
2259 | instruction until the child is out of the shared region (such | |
2260 | are vfork's semantics), it is safe to simply continue it. | |
2261 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2262 | the parent, and tell it to `keep_going', which automatically | |
2263 | re-sets it stepping. */ | |
1eb8556f | 2264 | infrun_debug_printf ("resume : clear step"); |
c4464ade | 2265 | step = false; |
74609e71 YQ |
2266 | } |
2267 | ||
7ca9b62a TBA |
2268 | CORE_ADDR pc = regcache_read_pc (regcache); |
2269 | ||
1eb8556f SM |
2270 | infrun_debug_printf ("step=%d, signal=%s, trap_expected=%d, " |
2271 | "current thread [%s] at %s", | |
2272 | step, gdb_signal_to_symbol_string (sig), | |
2273 | tp->control.trap_expected, | |
2274 | target_pid_to_str (inferior_ptid).c_str (), | |
2275 | paddress (gdbarch, pc)); | |
c906108c | 2276 | |
c2c6d25f JM |
2277 | /* Normally, by the time we reach `resume', the breakpoints are either |
2278 | removed or inserted, as appropriate. The exception is if we're sitting | |
2279 | at a permanent breakpoint; we need to step over it, but permanent | |
2280 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2281 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2282 | { |
af48d08f PA |
2283 | if (sig != GDB_SIGNAL_0) |
2284 | { | |
2285 | /* We have a signal to pass to the inferior. The resume | |
2286 | may, or may not take us to the signal handler. If this | |
2287 | is a step, we'll need to stop in the signal handler, if | |
2288 | there's one, (if the target supports stepping into | |
2289 | handlers), or in the next mainline instruction, if | |
2290 | there's no handler. If this is a continue, we need to be | |
2291 | sure to run the handler with all breakpoints inserted. | |
2292 | In all cases, set a breakpoint at the current address | |
2293 | (where the handler returns to), and once that breakpoint | |
2294 | is hit, resume skipping the permanent breakpoint. If | |
2295 | that breakpoint isn't hit, then we've stepped into the | |
2296 | signal handler (or hit some other event). We'll delete | |
2297 | the step-resume breakpoint then. */ | |
2298 | ||
1eb8556f SM |
2299 | infrun_debug_printf ("resume: skipping permanent breakpoint, " |
2300 | "deliver signal first"); | |
af48d08f PA |
2301 | |
2302 | clear_step_over_info (); | |
2303 | tp->control.trap_expected = 0; | |
2304 | ||
2305 | if (tp->control.step_resume_breakpoint == NULL) | |
2306 | { | |
2307 | /* Set a "high-priority" step-resume, as we don't want | |
2308 | user breakpoints at PC to trigger (again) when this | |
2309 | hits. */ | |
2310 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2311 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2312 | ||
2313 | tp->step_after_step_resume_breakpoint = step; | |
2314 | } | |
2315 | ||
2316 | insert_breakpoints (); | |
2317 | } | |
2318 | else | |
2319 | { | |
2320 | /* There's no signal to pass, we can go ahead and skip the | |
2321 | permanent breakpoint manually. */ | |
1eb8556f | 2322 | infrun_debug_printf ("skipping permanent breakpoint"); |
af48d08f PA |
2323 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); |
2324 | /* Update pc to reflect the new address from which we will | |
2325 | execute instructions. */ | |
2326 | pc = regcache_read_pc (regcache); | |
2327 | ||
2328 | if (step) | |
2329 | { | |
2330 | /* We've already advanced the PC, so the stepping part | |
2331 | is done. Now we need to arrange for a trap to be | |
2332 | reported to handle_inferior_event. Set a breakpoint | |
2333 | at the current PC, and run to it. Don't update | |
2334 | prev_pc, because if we end in | |
44a1ee51 PA |
2335 | switch_back_to_stepped_thread, we want the "expected |
2336 | thread advanced also" branch to be taken. IOW, we | |
2337 | don't want this thread to step further from PC | |
af48d08f | 2338 | (overstep). */ |
1ac806b8 | 2339 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2340 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2341 | insert_breakpoints (); | |
2342 | ||
fbea99ea | 2343 | resume_ptid = internal_resume_ptid (user_step); |
c4464ade | 2344 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
719546c4 | 2345 | tp->resumed = true; |
af48d08f PA |
2346 | return; |
2347 | } | |
2348 | } | |
6d350bb5 | 2349 | } |
c2c6d25f | 2350 | |
c1e36e3e PA |
2351 | /* If we have a breakpoint to step over, make sure to do a single |
2352 | step only. Same if we have software watchpoints. */ | |
2353 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2354 | tp->control.may_range_step = 0; | |
2355 | ||
7da6a5b9 LM |
2356 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2357 | copy of the instruction at a different address. | |
237fc4c9 PA |
2358 | |
2359 | We can't use displaced stepping when we have a signal to deliver; | |
2360 | the comments for displaced_step_prepare explain why. The | |
2361 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2362 | signals' explain what we do instead. |
2363 | ||
2364 | We can't use displaced stepping when we are waiting for vfork_done | |
2365 | event, displaced stepping breaks the vfork child similarly as single | |
2366 | step software breakpoint. */ | |
3fc8eb30 PA |
2367 | if (tp->control.trap_expected |
2368 | && use_displaced_stepping (tp) | |
cb71640d | 2369 | && !step_over_info_valid_p () |
a493e3e2 | 2370 | && sig == GDB_SIGNAL_0 |
74609e71 | 2371 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2372 | { |
bab37966 SM |
2373 | displaced_step_prepare_status prepare_status |
2374 | = displaced_step_prepare (tp); | |
fc1cf338 | 2375 | |
bab37966 | 2376 | if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
d56b7306 | 2377 | { |
1eb8556f | 2378 | infrun_debug_printf ("Got placed in step-over queue"); |
4d9d9d04 PA |
2379 | |
2380 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2381 | return; |
2382 | } | |
bab37966 | 2383 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_CANT) |
3fc8eb30 PA |
2384 | { |
2385 | /* Fallback to stepping over the breakpoint in-line. */ | |
2386 | ||
2387 | if (target_is_non_stop_p ()) | |
2388 | stop_all_threads (); | |
2389 | ||
a01bda52 | 2390 | set_step_over_info (regcache->aspace (), |
21edc42f | 2391 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2392 | |
2393 | step = maybe_software_singlestep (gdbarch, pc); | |
2394 | ||
2395 | insert_breakpoints (); | |
2396 | } | |
bab37966 | 2397 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_OK) |
3fc8eb30 | 2398 | { |
3fc8eb30 PA |
2399 | /* Update pc to reflect the new address from which we will |
2400 | execute instructions due to displaced stepping. */ | |
00431a78 | 2401 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2402 | |
40a53766 | 2403 | step = gdbarch_displaced_step_hw_singlestep (gdbarch); |
3fc8eb30 | 2404 | } |
bab37966 SM |
2405 | else |
2406 | gdb_assert_not_reached (_("Invalid displaced_step_prepare_status " | |
2407 | "value.")); | |
237fc4c9 PA |
2408 | } |
2409 | ||
2facfe5c | 2410 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2411 | else if (step) |
2facfe5c | 2412 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2413 | |
30852783 UW |
2414 | /* Currently, our software single-step implementation leads to different |
2415 | results than hardware single-stepping in one situation: when stepping | |
2416 | into delivering a signal which has an associated signal handler, | |
2417 | hardware single-step will stop at the first instruction of the handler, | |
2418 | while software single-step will simply skip execution of the handler. | |
2419 | ||
2420 | For now, this difference in behavior is accepted since there is no | |
2421 | easy way to actually implement single-stepping into a signal handler | |
2422 | without kernel support. | |
2423 | ||
2424 | However, there is one scenario where this difference leads to follow-on | |
2425 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2426 | and then single-stepping. In this case, the software single-step | |
2427 | behavior means that even if there is a *breakpoint* in the signal | |
2428 | handler, GDB still would not stop. | |
2429 | ||
2430 | Fortunately, we can at least fix this particular issue. We detect | |
2431 | here the case where we are about to deliver a signal while software | |
2432 | single-stepping with breakpoints removed. In this situation, we | |
2433 | revert the decisions to remove all breakpoints and insert single- | |
2434 | step breakpoints, and instead we install a step-resume breakpoint | |
2435 | at the current address, deliver the signal without stepping, and | |
2436 | once we arrive back at the step-resume breakpoint, actually step | |
2437 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2438 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2439 | && sig != GDB_SIGNAL_0 |
2440 | && step_over_info_valid_p ()) | |
30852783 UW |
2441 | { |
2442 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2443 | immediately after a handler returns, might already have |
30852783 UW |
2444 | a step-resume breakpoint set on the earlier handler. We cannot |
2445 | set another step-resume breakpoint; just continue on until the | |
2446 | original breakpoint is hit. */ | |
2447 | if (tp->control.step_resume_breakpoint == NULL) | |
2448 | { | |
2c03e5be | 2449 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2450 | tp->step_after_step_resume_breakpoint = 1; |
2451 | } | |
2452 | ||
34b7e8a6 | 2453 | delete_single_step_breakpoints (tp); |
30852783 | 2454 | |
31e77af2 | 2455 | clear_step_over_info (); |
30852783 | 2456 | tp->control.trap_expected = 0; |
31e77af2 PA |
2457 | |
2458 | insert_breakpoints (); | |
30852783 UW |
2459 | } |
2460 | ||
b0f16a3e SM |
2461 | /* If STEP is set, it's a request to use hardware stepping |
2462 | facilities. But in that case, we should never | |
2463 | use singlestep breakpoint. */ | |
34b7e8a6 | 2464 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2465 | |
fbea99ea | 2466 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2467 | if (tp->control.trap_expected) |
b0f16a3e SM |
2468 | { |
2469 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2470 | hit, either by single-stepping the thread with the breakpoint |
2471 | removed, or by displaced stepping, with the breakpoint inserted. | |
2472 | In the former case, we need to single-step only this thread, | |
2473 | and keep others stopped, as they can miss this breakpoint if | |
2474 | allowed to run. That's not really a problem for displaced | |
2475 | stepping, but, we still keep other threads stopped, in case | |
2476 | another thread is also stopped for a breakpoint waiting for | |
2477 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2478 | resume_ptid = inferior_ptid; |
2479 | } | |
fbea99ea PA |
2480 | else |
2481 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2482 | |
7f5ef605 PA |
2483 | if (execution_direction != EXEC_REVERSE |
2484 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2485 | { |
372316f1 PA |
2486 | /* There are two cases where we currently need to step a |
2487 | breakpoint instruction when we have a signal to deliver: | |
2488 | ||
2489 | - See handle_signal_stop where we handle random signals that | |
2490 | could take out us out of the stepping range. Normally, in | |
2491 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2492 | signal handler with a breakpoint at PC, but there are cases |
2493 | where we should _always_ single-step, even if we have a | |
2494 | step-resume breakpoint, like when a software watchpoint is | |
2495 | set. Assuming single-stepping and delivering a signal at the | |
2496 | same time would takes us to the signal handler, then we could | |
2497 | have removed the breakpoint at PC to step over it. However, | |
2498 | some hardware step targets (like e.g., Mac OS) can't step | |
2499 | into signal handlers, and for those, we need to leave the | |
2500 | breakpoint at PC inserted, as otherwise if the handler | |
2501 | recurses and executes PC again, it'll miss the breakpoint. | |
2502 | So we leave the breakpoint inserted anyway, but we need to | |
2503 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2504 | that adjust_pc_after_break doesn't end up confused. |
2505 | ||
dda83cd7 | 2506 | - In non-stop if we insert a breakpoint (e.g., a step-resume) |
372316f1 PA |
2507 | in one thread after another thread that was stepping had been |
2508 | momentarily paused for a step-over. When we re-resume the | |
2509 | stepping thread, it may be resumed from that address with a | |
2510 | breakpoint that hasn't trapped yet. Seen with | |
2511 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2512 | do displaced stepping. */ | |
2513 | ||
1eb8556f SM |
2514 | infrun_debug_printf ("resume: [%s] stepped breakpoint", |
2515 | target_pid_to_str (tp->ptid).c_str ()); | |
7f5ef605 PA |
2516 | |
2517 | tp->stepped_breakpoint = 1; | |
2518 | ||
b0f16a3e SM |
2519 | /* Most targets can step a breakpoint instruction, thus |
2520 | executing it normally. But if this one cannot, just | |
2521 | continue and we will hit it anyway. */ | |
7f5ef605 | 2522 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4464ade | 2523 | step = false; |
b0f16a3e | 2524 | } |
ef5cf84e | 2525 | |
b0f16a3e | 2526 | if (debug_displaced |
cb71640d | 2527 | && tp->control.trap_expected |
3fc8eb30 | 2528 | && use_displaced_stepping (tp) |
cb71640d | 2529 | && !step_over_info_valid_p ()) |
b0f16a3e | 2530 | { |
00431a78 | 2531 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2532 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2533 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2534 | gdb_byte buf[4]; | |
2535 | ||
b0f16a3e | 2536 | read_memory (actual_pc, buf, sizeof (buf)); |
136821d9 SM |
2537 | displaced_debug_printf ("run %s: %s", |
2538 | paddress (resume_gdbarch, actual_pc), | |
2539 | displaced_step_dump_bytes | |
2540 | (buf, sizeof (buf)).c_str ()); | |
b0f16a3e | 2541 | } |
237fc4c9 | 2542 | |
b0f16a3e SM |
2543 | if (tp->control.may_range_step) |
2544 | { | |
2545 | /* If we're resuming a thread with the PC out of the step | |
2546 | range, then we're doing some nested/finer run control | |
2547 | operation, like stepping the thread out of the dynamic | |
2548 | linker or the displaced stepping scratch pad. We | |
2549 | shouldn't have allowed a range step then. */ | |
2550 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2551 | } | |
c1e36e3e | 2552 | |
64ce06e4 | 2553 | do_target_resume (resume_ptid, step, sig); |
719546c4 | 2554 | tp->resumed = true; |
c906108c | 2555 | } |
71d378ae PA |
2556 | |
2557 | /* Resume the inferior. SIG is the signal to give the inferior | |
2558 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2559 | rolls back state on error. */ | |
2560 | ||
aff4e175 | 2561 | static void |
71d378ae PA |
2562 | resume (gdb_signal sig) |
2563 | { | |
a70b8144 | 2564 | try |
71d378ae PA |
2565 | { |
2566 | resume_1 (sig); | |
2567 | } | |
230d2906 | 2568 | catch (const gdb_exception &ex) |
71d378ae PA |
2569 | { |
2570 | /* If resuming is being aborted for any reason, delete any | |
2571 | single-step breakpoint resume_1 may have created, to avoid | |
2572 | confusing the following resumption, and to avoid leaving | |
2573 | single-step breakpoints perturbing other threads, in case | |
2574 | we're running in non-stop mode. */ | |
2575 | if (inferior_ptid != null_ptid) | |
2576 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2577 | throw; |
71d378ae | 2578 | } |
71d378ae PA |
2579 | } |
2580 | ||
c906108c | 2581 | \f |
237fc4c9 | 2582 | /* Proceeding. */ |
c906108c | 2583 | |
4c2f2a79 PA |
2584 | /* See infrun.h. */ |
2585 | ||
2586 | /* Counter that tracks number of user visible stops. This can be used | |
2587 | to tell whether a command has proceeded the inferior past the | |
2588 | current location. This allows e.g., inferior function calls in | |
2589 | breakpoint commands to not interrupt the command list. When the | |
2590 | call finishes successfully, the inferior is standing at the same | |
2591 | breakpoint as if nothing happened (and so we don't call | |
2592 | normal_stop). */ | |
2593 | static ULONGEST current_stop_id; | |
2594 | ||
2595 | /* See infrun.h. */ | |
2596 | ||
2597 | ULONGEST | |
2598 | get_stop_id (void) | |
2599 | { | |
2600 | return current_stop_id; | |
2601 | } | |
2602 | ||
2603 | /* Called when we report a user visible stop. */ | |
2604 | ||
2605 | static void | |
2606 | new_stop_id (void) | |
2607 | { | |
2608 | current_stop_id++; | |
2609 | } | |
2610 | ||
c906108c SS |
2611 | /* Clear out all variables saying what to do when inferior is continued. |
2612 | First do this, then set the ones you want, then call `proceed'. */ | |
2613 | ||
a7212384 UW |
2614 | static void |
2615 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2616 | { |
1eb8556f | 2617 | infrun_debug_printf ("%s", target_pid_to_str (tp->ptid).c_str ()); |
d6b48e9c | 2618 | |
372316f1 PA |
2619 | /* If we're starting a new sequence, then the previous finished |
2620 | single-step is no longer relevant. */ | |
2621 | if (tp->suspend.waitstatus_pending_p) | |
2622 | { | |
2623 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2624 | { | |
1eb8556f SM |
2625 | infrun_debug_printf ("pending event of %s was a finished step. " |
2626 | "Discarding.", | |
2627 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2628 | |
2629 | tp->suspend.waitstatus_pending_p = 0; | |
2630 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2631 | } | |
1eb8556f | 2632 | else |
372316f1 | 2633 | { |
1eb8556f SM |
2634 | infrun_debug_printf |
2635 | ("thread %s has pending wait status %s (currently_stepping=%d).", | |
2636 | target_pid_to_str (tp->ptid).c_str (), | |
2637 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2638 | currently_stepping (tp)); | |
372316f1 PA |
2639 | } |
2640 | } | |
2641 | ||
70509625 PA |
2642 | /* If this signal should not be seen by program, give it zero. |
2643 | Used for debugging signals. */ | |
2644 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2645 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2646 | ||
46e3ed7f | 2647 | delete tp->thread_fsm; |
243a9253 PA |
2648 | tp->thread_fsm = NULL; |
2649 | ||
16c381f0 JK |
2650 | tp->control.trap_expected = 0; |
2651 | tp->control.step_range_start = 0; | |
2652 | tp->control.step_range_end = 0; | |
c1e36e3e | 2653 | tp->control.may_range_step = 0; |
16c381f0 JK |
2654 | tp->control.step_frame_id = null_frame_id; |
2655 | tp->control.step_stack_frame_id = null_frame_id; | |
2656 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2657 | tp->control.step_start_function = NULL; |
a7212384 | 2658 | tp->stop_requested = 0; |
4e1c45ea | 2659 | |
16c381f0 | 2660 | tp->control.stop_step = 0; |
32400beb | 2661 | |
16c381f0 | 2662 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2663 | |
856e7dd6 | 2664 | tp->control.stepping_command = 0; |
17b2616c | 2665 | |
a7212384 | 2666 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2667 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2668 | } |
32400beb | 2669 | |
a7212384 | 2670 | void |
70509625 | 2671 | clear_proceed_status (int step) |
a7212384 | 2672 | { |
f2665db5 MM |
2673 | /* With scheduler-locking replay, stop replaying other threads if we're |
2674 | not replaying the user-visible resume ptid. | |
2675 | ||
2676 | This is a convenience feature to not require the user to explicitly | |
2677 | stop replaying the other threads. We're assuming that the user's | |
2678 | intent is to resume tracing the recorded process. */ | |
2679 | if (!non_stop && scheduler_mode == schedlock_replay | |
2680 | && target_record_is_replaying (minus_one_ptid) | |
2681 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2682 | execution_direction)) | |
2683 | target_record_stop_replaying (); | |
2684 | ||
08036331 | 2685 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2686 | { |
08036331 | 2687 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2688 | process_stratum_target *resume_target |
2689 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2690 | |
2691 | /* In all-stop mode, delete the per-thread status of all threads | |
2692 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2693 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2694 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2695 | } |
2696 | ||
d7e15655 | 2697 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2698 | { |
2699 | struct inferior *inferior; | |
2700 | ||
2701 | if (non_stop) | |
2702 | { | |
6c95b8df PA |
2703 | /* If in non-stop mode, only delete the per-thread status of |
2704 | the current thread. */ | |
a7212384 UW |
2705 | clear_proceed_status_thread (inferior_thread ()); |
2706 | } | |
6c95b8df | 2707 | |
d6b48e9c | 2708 | inferior = current_inferior (); |
16c381f0 | 2709 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2710 | } |
2711 | ||
76727919 | 2712 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2713 | } |
2714 | ||
99619bea PA |
2715 | /* Returns true if TP is still stopped at a breakpoint that needs |
2716 | stepping-over in order to make progress. If the breakpoint is gone | |
2717 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b | 2718 | |
c4464ade | 2719 | static bool |
6c4cfb24 | 2720 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2721 | { |
2722 | if (tp->stepping_over_breakpoint) | |
2723 | { | |
00431a78 | 2724 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2725 | |
a01bda52 | 2726 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2727 | regcache_read_pc (regcache)) |
2728 | == ordinary_breakpoint_here) | |
c4464ade | 2729 | return true; |
99619bea PA |
2730 | |
2731 | tp->stepping_over_breakpoint = 0; | |
2732 | } | |
2733 | ||
c4464ade | 2734 | return false; |
99619bea PA |
2735 | } |
2736 | ||
6c4cfb24 PA |
2737 | /* Check whether thread TP still needs to start a step-over in order |
2738 | to make progress when resumed. Returns an bitwise or of enum | |
2739 | step_over_what bits, indicating what needs to be stepped over. */ | |
2740 | ||
8d297bbf | 2741 | static step_over_what |
6c4cfb24 PA |
2742 | thread_still_needs_step_over (struct thread_info *tp) |
2743 | { | |
8d297bbf | 2744 | step_over_what what = 0; |
6c4cfb24 PA |
2745 | |
2746 | if (thread_still_needs_step_over_bp (tp)) | |
2747 | what |= STEP_OVER_BREAKPOINT; | |
2748 | ||
2749 | if (tp->stepping_over_watchpoint | |
9aed480c | 2750 | && !target_have_steppable_watchpoint ()) |
6c4cfb24 PA |
2751 | what |= STEP_OVER_WATCHPOINT; |
2752 | ||
2753 | return what; | |
2754 | } | |
2755 | ||
483805cf PA |
2756 | /* Returns true if scheduler locking applies. STEP indicates whether |
2757 | we're about to do a step/next-like command to a thread. */ | |
2758 | ||
c4464ade | 2759 | static bool |
856e7dd6 | 2760 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2761 | { |
2762 | return (scheduler_mode == schedlock_on | |
2763 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2764 | && tp->control.stepping_command) |
2765 | || (scheduler_mode == schedlock_replay | |
2766 | && target_record_will_replay (minus_one_ptid, | |
2767 | execution_direction))); | |
483805cf PA |
2768 | } |
2769 | ||
1192f124 SM |
2770 | /* Set process_stratum_target::COMMIT_RESUMED_STATE in all target |
2771 | stacks that have threads executing and don't have threads with | |
2772 | pending events. */ | |
5b6d1e4f PA |
2773 | |
2774 | static void | |
1192f124 SM |
2775 | maybe_set_commit_resumed_all_targets () |
2776 | { | |
b4b1a226 SM |
2777 | scoped_restore_current_thread restore_thread; |
2778 | ||
1192f124 SM |
2779 | for (inferior *inf : all_non_exited_inferiors ()) |
2780 | { | |
2781 | process_stratum_target *proc_target = inf->process_target (); | |
2782 | ||
2783 | if (proc_target->commit_resumed_state) | |
2784 | { | |
2785 | /* We already set this in a previous iteration, via another | |
2786 | inferior sharing the process_stratum target. */ | |
2787 | continue; | |
2788 | } | |
2789 | ||
2790 | /* If the target has no resumed threads, it would be useless to | |
2791 | ask it to commit the resumed threads. */ | |
2792 | if (!proc_target->threads_executing) | |
2793 | { | |
2794 | infrun_debug_printf ("not requesting commit-resumed for target " | |
2795 | "%s, no resumed threads", | |
2796 | proc_target->shortname ()); | |
2797 | continue; | |
2798 | } | |
2799 | ||
2800 | /* As an optimization, if a thread from this target has some | |
2801 | status to report, handle it before requiring the target to | |
2802 | commit its resumed threads: handling the status might lead to | |
2803 | resuming more threads. */ | |
2804 | bool has_thread_with_pending_status = false; | |
2805 | for (thread_info *thread : all_non_exited_threads (proc_target)) | |
2806 | if (thread->resumed && thread->suspend.waitstatus_pending_p) | |
2807 | { | |
2808 | has_thread_with_pending_status = true; | |
2809 | break; | |
2810 | } | |
2811 | ||
2812 | if (has_thread_with_pending_status) | |
2813 | { | |
2814 | infrun_debug_printf ("not requesting commit-resumed for target %s, a" | |
2815 | " thread has a pending waitstatus", | |
2816 | proc_target->shortname ()); | |
2817 | continue; | |
2818 | } | |
2819 | ||
b4b1a226 SM |
2820 | switch_to_inferior_no_thread (inf); |
2821 | ||
2822 | if (target_has_pending_events ()) | |
2823 | { | |
2824 | infrun_debug_printf ("not requesting commit-resumed for target %s, " | |
2825 | "target has pending events", | |
2826 | proc_target->shortname ()); | |
2827 | continue; | |
2828 | } | |
2829 | ||
1192f124 SM |
2830 | infrun_debug_printf ("enabling commit-resumed for target %s", |
2831 | proc_target->shortname ()); | |
2832 | ||
2833 | proc_target->commit_resumed_state = true; | |
2834 | } | |
2835 | } | |
2836 | ||
2837 | /* See infrun.h. */ | |
2838 | ||
2839 | void | |
2840 | maybe_call_commit_resumed_all_targets () | |
5b6d1e4f PA |
2841 | { |
2842 | scoped_restore_current_thread restore_thread; | |
2843 | ||
1192f124 SM |
2844 | for (inferior *inf : all_non_exited_inferiors ()) |
2845 | { | |
2846 | process_stratum_target *proc_target = inf->process_target (); | |
2847 | ||
2848 | if (!proc_target->commit_resumed_state) | |
2849 | continue; | |
2850 | ||
2851 | switch_to_inferior_no_thread (inf); | |
2852 | ||
2853 | infrun_debug_printf ("calling commit_resumed for target %s", | |
2854 | proc_target->shortname()); | |
2855 | ||
2856 | target_commit_resumed (); | |
2857 | } | |
2858 | } | |
2859 | ||
2860 | /* To track nesting of scoped_disable_commit_resumed objects, ensuring | |
2861 | that only the outermost one attempts to re-enable | |
2862 | commit-resumed. */ | |
2863 | static bool enable_commit_resumed = true; | |
2864 | ||
2865 | /* See infrun.h. */ | |
2866 | ||
2867 | scoped_disable_commit_resumed::scoped_disable_commit_resumed | |
2868 | (const char *reason) | |
2869 | : m_reason (reason), | |
2870 | m_prev_enable_commit_resumed (enable_commit_resumed) | |
2871 | { | |
2872 | infrun_debug_printf ("reason=%s", m_reason); | |
2873 | ||
2874 | enable_commit_resumed = false; | |
5b6d1e4f PA |
2875 | |
2876 | for (inferior *inf : all_non_exited_inferiors ()) | |
1192f124 SM |
2877 | { |
2878 | process_stratum_target *proc_target = inf->process_target (); | |
5b6d1e4f | 2879 | |
1192f124 SM |
2880 | if (m_prev_enable_commit_resumed) |
2881 | { | |
2882 | /* This is the outermost instance: force all | |
2883 | COMMIT_RESUMED_STATE to false. */ | |
2884 | proc_target->commit_resumed_state = false; | |
2885 | } | |
2886 | else | |
2887 | { | |
2888 | /* This is not the outermost instance, we expect | |
2889 | COMMIT_RESUMED_STATE to have been cleared by the | |
2890 | outermost instance. */ | |
2891 | gdb_assert (!proc_target->commit_resumed_state); | |
2892 | } | |
2893 | } | |
2894 | } | |
2895 | ||
2896 | /* See infrun.h. */ | |
2897 | ||
2898 | void | |
2899 | scoped_disable_commit_resumed::reset () | |
2900 | { | |
2901 | if (m_reset) | |
2902 | return; | |
2903 | m_reset = true; | |
2904 | ||
2905 | infrun_debug_printf ("reason=%s", m_reason); | |
2906 | ||
2907 | gdb_assert (!enable_commit_resumed); | |
2908 | ||
2909 | enable_commit_resumed = m_prev_enable_commit_resumed; | |
2910 | ||
2911 | if (m_prev_enable_commit_resumed) | |
5b6d1e4f | 2912 | { |
1192f124 SM |
2913 | /* This is the outermost instance, re-enable |
2914 | COMMIT_RESUMED_STATE on the targets where it's possible. */ | |
2915 | maybe_set_commit_resumed_all_targets (); | |
2916 | } | |
2917 | else | |
2918 | { | |
2919 | /* This is not the outermost instance, we expect | |
2920 | COMMIT_RESUMED_STATE to still be false. */ | |
2921 | for (inferior *inf : all_non_exited_inferiors ()) | |
2922 | { | |
2923 | process_stratum_target *proc_target = inf->process_target (); | |
2924 | gdb_assert (!proc_target->commit_resumed_state); | |
2925 | } | |
2926 | } | |
2927 | } | |
2928 | ||
2929 | /* See infrun.h. */ | |
2930 | ||
2931 | scoped_disable_commit_resumed::~scoped_disable_commit_resumed () | |
2932 | { | |
2933 | reset (); | |
2934 | } | |
2935 | ||
2936 | /* See infrun.h. */ | |
2937 | ||
2938 | void | |
2939 | scoped_disable_commit_resumed::reset_and_commit () | |
2940 | { | |
2941 | reset (); | |
2942 | maybe_call_commit_resumed_all_targets (); | |
2943 | } | |
2944 | ||
2945 | /* See infrun.h. */ | |
2946 | ||
2947 | scoped_enable_commit_resumed::scoped_enable_commit_resumed | |
2948 | (const char *reason) | |
2949 | : m_reason (reason), | |
2950 | m_prev_enable_commit_resumed (enable_commit_resumed) | |
2951 | { | |
2952 | infrun_debug_printf ("reason=%s", m_reason); | |
2953 | ||
2954 | if (!enable_commit_resumed) | |
2955 | { | |
2956 | enable_commit_resumed = true; | |
2957 | ||
2958 | /* Re-enable COMMIT_RESUMED_STATE on the targets where it's | |
2959 | possible. */ | |
2960 | maybe_set_commit_resumed_all_targets (); | |
2961 | ||
2962 | maybe_call_commit_resumed_all_targets (); | |
2963 | } | |
2964 | } | |
2965 | ||
2966 | /* See infrun.h. */ | |
2967 | ||
2968 | scoped_enable_commit_resumed::~scoped_enable_commit_resumed () | |
2969 | { | |
2970 | infrun_debug_printf ("reason=%s", m_reason); | |
2971 | ||
2972 | gdb_assert (enable_commit_resumed); | |
2973 | ||
2974 | enable_commit_resumed = m_prev_enable_commit_resumed; | |
2975 | ||
2976 | if (!enable_commit_resumed) | |
2977 | { | |
2978 | /* Force all COMMIT_RESUMED_STATE back to false. */ | |
2979 | for (inferior *inf : all_non_exited_inferiors ()) | |
2980 | { | |
2981 | process_stratum_target *proc_target = inf->process_target (); | |
2982 | proc_target->commit_resumed_state = false; | |
2983 | } | |
5b6d1e4f PA |
2984 | } |
2985 | } | |
2986 | ||
2f4fcf00 PA |
2987 | /* Check that all the targets we're about to resume are in non-stop |
2988 | mode. Ideally, we'd only care whether all targets support | |
2989 | target-async, but we're not there yet. E.g., stop_all_threads | |
2990 | doesn't know how to handle all-stop targets. Also, the remote | |
2991 | protocol in all-stop mode is synchronous, irrespective of | |
2992 | target-async, which means that things like a breakpoint re-set | |
2993 | triggered by one target would try to read memory from all targets | |
2994 | and fail. */ | |
2995 | ||
2996 | static void | |
2997 | check_multi_target_resumption (process_stratum_target *resume_target) | |
2998 | { | |
2999 | if (!non_stop && resume_target == nullptr) | |
3000 | { | |
3001 | scoped_restore_current_thread restore_thread; | |
3002 | ||
3003 | /* This is used to track whether we're resuming more than one | |
3004 | target. */ | |
3005 | process_stratum_target *first_connection = nullptr; | |
3006 | ||
3007 | /* The first inferior we see with a target that does not work in | |
3008 | always-non-stop mode. */ | |
3009 | inferior *first_not_non_stop = nullptr; | |
3010 | ||
f058c521 | 3011 | for (inferior *inf : all_non_exited_inferiors ()) |
2f4fcf00 PA |
3012 | { |
3013 | switch_to_inferior_no_thread (inf); | |
3014 | ||
55f6301a | 3015 | if (!target_has_execution ()) |
2f4fcf00 PA |
3016 | continue; |
3017 | ||
3018 | process_stratum_target *proc_target | |
3019 | = current_inferior ()->process_target(); | |
3020 | ||
3021 | if (!target_is_non_stop_p ()) | |
3022 | first_not_non_stop = inf; | |
3023 | ||
3024 | if (first_connection == nullptr) | |
3025 | first_connection = proc_target; | |
3026 | else if (first_connection != proc_target | |
3027 | && first_not_non_stop != nullptr) | |
3028 | { | |
3029 | switch_to_inferior_no_thread (first_not_non_stop); | |
3030 | ||
3031 | proc_target = current_inferior ()->process_target(); | |
3032 | ||
3033 | error (_("Connection %d (%s) does not support " | |
3034 | "multi-target resumption."), | |
3035 | proc_target->connection_number, | |
3036 | make_target_connection_string (proc_target).c_str ()); | |
3037 | } | |
3038 | } | |
3039 | } | |
3040 | } | |
3041 | ||
c906108c SS |
3042 | /* Basic routine for continuing the program in various fashions. |
3043 | ||
3044 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
3045 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
3046 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
3047 | |
3048 | You should call clear_proceed_status before calling proceed. */ | |
3049 | ||
3050 | void | |
64ce06e4 | 3051 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 3052 | { |
3ec3145c SM |
3053 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
3054 | ||
e58b0e63 PA |
3055 | struct regcache *regcache; |
3056 | struct gdbarch *gdbarch; | |
e58b0e63 | 3057 | CORE_ADDR pc; |
4d9d9d04 PA |
3058 | struct execution_control_state ecss; |
3059 | struct execution_control_state *ecs = &ecss; | |
c4464ade | 3060 | bool started; |
c906108c | 3061 | |
e58b0e63 PA |
3062 | /* If we're stopped at a fork/vfork, follow the branch set by the |
3063 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
3064 | resuming the current thread. */ | |
3065 | if (!follow_fork ()) | |
3066 | { | |
3067 | /* The target for some reason decided not to resume. */ | |
3068 | normal_stop (); | |
f148b27e | 3069 | if (target_can_async_p ()) |
b1a35af2 | 3070 | inferior_event_handler (INF_EXEC_COMPLETE); |
e58b0e63 PA |
3071 | return; |
3072 | } | |
3073 | ||
842951eb PA |
3074 | /* We'll update this if & when we switch to a new thread. */ |
3075 | previous_inferior_ptid = inferior_ptid; | |
3076 | ||
e58b0e63 | 3077 | regcache = get_current_regcache (); |
ac7936df | 3078 | gdbarch = regcache->arch (); |
8b86c959 YQ |
3079 | const address_space *aspace = regcache->aspace (); |
3080 | ||
fc75c28b TBA |
3081 | pc = regcache_read_pc_protected (regcache); |
3082 | ||
08036331 | 3083 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 3084 | |
99619bea | 3085 | /* Fill in with reasonable starting values. */ |
08036331 | 3086 | init_thread_stepping_state (cur_thr); |
99619bea | 3087 | |
08036331 | 3088 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 3089 | |
5b6d1e4f PA |
3090 | ptid_t resume_ptid |
3091 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
3092 | process_stratum_target *resume_target | |
3093 | = user_visible_resume_target (resume_ptid); | |
3094 | ||
2f4fcf00 PA |
3095 | check_multi_target_resumption (resume_target); |
3096 | ||
2acceee2 | 3097 | if (addr == (CORE_ADDR) -1) |
c906108c | 3098 | { |
08036331 | 3099 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 3100 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 3101 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
3102 | /* There is a breakpoint at the address we will resume at, |
3103 | step one instruction before inserting breakpoints so that | |
3104 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
3105 | breakpoint). |
3106 | ||
3107 | Note, we don't do this in reverse, because we won't | |
3108 | actually be executing the breakpoint insn anyway. | |
3109 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 3110 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
3111 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3112 | && gdbarch_single_step_through_delay (gdbarch, | |
3113 | get_current_frame ())) | |
3352ef37 AC |
3114 | /* We stepped onto an instruction that needs to be stepped |
3115 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 3116 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
3117 | } |
3118 | else | |
3119 | { | |
515630c5 | 3120 | regcache_write_pc (regcache, addr); |
c906108c SS |
3121 | } |
3122 | ||
70509625 | 3123 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 3124 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 3125 | |
4d9d9d04 PA |
3126 | /* If an exception is thrown from this point on, make sure to |
3127 | propagate GDB's knowledge of the executing state to the | |
3128 | frontend/user running state. */ | |
5b6d1e4f | 3129 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
3130 | |
3131 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3132 | threads (e.g., we might need to set threads stepping over | |
3133 | breakpoints first), from the user/frontend's point of view, all | |
3134 | threads in RESUME_PTID are now running. Unless we're calling an | |
3135 | inferior function, as in that case we pretend the inferior | |
3136 | doesn't run at all. */ | |
08036331 | 3137 | if (!cur_thr->control.in_infcall) |
719546c4 | 3138 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3139 | |
1eb8556f SM |
3140 | infrun_debug_printf ("addr=%s, signal=%s", paddress (gdbarch, addr), |
3141 | gdb_signal_to_symbol_string (siggnal)); | |
527159b7 | 3142 | |
4d9d9d04 PA |
3143 | annotate_starting (); |
3144 | ||
3145 | /* Make sure that output from GDB appears before output from the | |
3146 | inferior. */ | |
3147 | gdb_flush (gdb_stdout); | |
3148 | ||
d930703d PA |
3149 | /* Since we've marked the inferior running, give it the terminal. A |
3150 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3151 | still detect attempts to unblock a stuck connection with repeated | |
3152 | Ctrl-C from within target_pass_ctrlc). */ | |
3153 | target_terminal::inferior (); | |
3154 | ||
4d9d9d04 PA |
3155 | /* In a multi-threaded task we may select another thread and |
3156 | then continue or step. | |
3157 | ||
3158 | But if a thread that we're resuming had stopped at a breakpoint, | |
3159 | it will immediately cause another breakpoint stop without any | |
3160 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3161 | we must step over it first. | |
3162 | ||
3163 | Look for threads other than the current (TP) that reported a | |
3164 | breakpoint hit and haven't been resumed yet since. */ | |
3165 | ||
3166 | /* If scheduler locking applies, we can avoid iterating over all | |
3167 | threads. */ | |
08036331 | 3168 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3169 | { |
5b6d1e4f PA |
3170 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3171 | resume_ptid)) | |
08036331 | 3172 | { |
f3f8ece4 PA |
3173 | switch_to_thread_no_regs (tp); |
3174 | ||
4d9d9d04 PA |
3175 | /* Ignore the current thread here. It's handled |
3176 | afterwards. */ | |
08036331 | 3177 | if (tp == cur_thr) |
4d9d9d04 | 3178 | continue; |
c906108c | 3179 | |
4d9d9d04 PA |
3180 | if (!thread_still_needs_step_over (tp)) |
3181 | continue; | |
3182 | ||
3183 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3184 | |
1eb8556f SM |
3185 | infrun_debug_printf ("need to step-over [%s] first", |
3186 | target_pid_to_str (tp->ptid).c_str ()); | |
99619bea | 3187 | |
28d5518b | 3188 | global_thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3189 | } |
f3f8ece4 PA |
3190 | |
3191 | switch_to_thread (cur_thr); | |
30852783 UW |
3192 | } |
3193 | ||
4d9d9d04 PA |
3194 | /* Enqueue the current thread last, so that we move all other |
3195 | threads over their breakpoints first. */ | |
08036331 | 3196 | if (cur_thr->stepping_over_breakpoint) |
28d5518b | 3197 | global_thread_step_over_chain_enqueue (cur_thr); |
30852783 | 3198 | |
4d9d9d04 PA |
3199 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3200 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3201 | advanced. Must do this before resuming any thread, as in | |
3202 | all-stop/remote, once we resume we can't send any other packet | |
3203 | until the target stops again. */ | |
fc75c28b | 3204 | cur_thr->prev_pc = regcache_read_pc_protected (regcache); |
99619bea | 3205 | |
a9bc57b9 | 3206 | { |
1192f124 | 3207 | scoped_disable_commit_resumed disable_commit_resumed ("proceeding"); |
85ad3aaf | 3208 | |
a9bc57b9 | 3209 | started = start_step_over (); |
c906108c | 3210 | |
a9bc57b9 TT |
3211 | if (step_over_info_valid_p ()) |
3212 | { | |
3213 | /* Either this thread started a new in-line step over, or some | |
3214 | other thread was already doing one. In either case, don't | |
3215 | resume anything else until the step-over is finished. */ | |
3216 | } | |
3217 | else if (started && !target_is_non_stop_p ()) | |
3218 | { | |
3219 | /* A new displaced stepping sequence was started. In all-stop, | |
3220 | we can't talk to the target anymore until it next stops. */ | |
3221 | } | |
3222 | else if (!non_stop && target_is_non_stop_p ()) | |
3223 | { | |
3ec3145c SM |
3224 | INFRUN_SCOPED_DEBUG_START_END |
3225 | ("resuming threads, all-stop-on-top-of-non-stop"); | |
3226 | ||
a9bc57b9 TT |
3227 | /* In all-stop, but the target is always in non-stop mode. |
3228 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3229 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3230 | resume_ptid)) | |
3231 | { | |
3232 | switch_to_thread_no_regs (tp); | |
3233 | ||
f9fac3c8 SM |
3234 | if (!tp->inf->has_execution ()) |
3235 | { | |
1eb8556f SM |
3236 | infrun_debug_printf ("[%s] target has no execution", |
3237 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3238 | continue; |
3239 | } | |
f3f8ece4 | 3240 | |
f9fac3c8 SM |
3241 | if (tp->resumed) |
3242 | { | |
1eb8556f SM |
3243 | infrun_debug_printf ("[%s] resumed", |
3244 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3245 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
3246 | continue; | |
3247 | } | |
fbea99ea | 3248 | |
f9fac3c8 SM |
3249 | if (thread_is_in_step_over_chain (tp)) |
3250 | { | |
1eb8556f SM |
3251 | infrun_debug_printf ("[%s] needs step-over", |
3252 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3253 | continue; |
3254 | } | |
fbea99ea | 3255 | |
1eb8556f | 3256 | infrun_debug_printf ("resuming %s", |
dda83cd7 | 3257 | target_pid_to_str (tp->ptid).c_str ()); |
fbea99ea | 3258 | |
f9fac3c8 SM |
3259 | reset_ecs (ecs, tp); |
3260 | switch_to_thread (tp); | |
3261 | keep_going_pass_signal (ecs); | |
3262 | if (!ecs->wait_some_more) | |
3263 | error (_("Command aborted.")); | |
3264 | } | |
a9bc57b9 | 3265 | } |
08036331 | 3266 | else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3267 | { |
3268 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3269 | reset_ecs (ecs, cur_thr); |
3270 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3271 | keep_going_pass_signal (ecs); |
3272 | if (!ecs->wait_some_more) | |
3273 | error (_("Command aborted.")); | |
3274 | } | |
c906108c | 3275 | |
1192f124 SM |
3276 | disable_commit_resumed.reset_and_commit (); |
3277 | } | |
85ad3aaf | 3278 | |
731f534f | 3279 | finish_state.release (); |
c906108c | 3280 | |
873657b9 PA |
3281 | /* If we've switched threads above, switch back to the previously |
3282 | current thread. We don't want the user to see a different | |
3283 | selected thread. */ | |
3284 | switch_to_thread (cur_thr); | |
3285 | ||
0b333c5e PA |
3286 | /* Tell the event loop to wait for it to stop. If the target |
3287 | supports asynchronous execution, it'll do this from within | |
3288 | target_resume. */ | |
362646f5 | 3289 | if (!target_can_async_p ()) |
0b333c5e | 3290 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3291 | } |
c906108c SS |
3292 | \f |
3293 | ||
3294 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3295 | |
c906108c | 3296 | void |
8621d6a9 | 3297 | start_remote (int from_tty) |
c906108c | 3298 | { |
5b6d1e4f PA |
3299 | inferior *inf = current_inferior (); |
3300 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3301 | |
1777feb0 | 3302 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3303 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3304 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3305 | nothing is returned (instead of just blocking). Because of this, |
3306 | targets expecting an immediate response need to, internally, set | |
3307 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3308 | timeout. */ |
6426a772 JM |
3309 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3310 | differentiate to its caller what the state of the target is after | |
3311 | the initial open has been performed. Here we're assuming that | |
3312 | the target has stopped. It should be possible to eventually have | |
3313 | target_open() return to the caller an indication that the target | |
3314 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3315 | for an async run. */ |
5b6d1e4f | 3316 | wait_for_inferior (inf); |
8621d6a9 DJ |
3317 | |
3318 | /* Now that the inferior has stopped, do any bookkeeping like | |
3319 | loading shared libraries. We want to do this before normal_stop, | |
3320 | so that the displayed frame is up to date. */ | |
a7aba266 | 3321 | post_create_inferior (from_tty); |
8621d6a9 | 3322 | |
6426a772 | 3323 | normal_stop (); |
c906108c SS |
3324 | } |
3325 | ||
3326 | /* Initialize static vars when a new inferior begins. */ | |
3327 | ||
3328 | void | |
96baa820 | 3329 | init_wait_for_inferior (void) |
c906108c SS |
3330 | { |
3331 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3332 | |
c906108c SS |
3333 | breakpoint_init_inferior (inf_starting); |
3334 | ||
70509625 | 3335 | clear_proceed_status (0); |
9f976b41 | 3336 | |
ab1ddbcf | 3337 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3338 | |
842951eb | 3339 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3340 | } |
237fc4c9 | 3341 | |
c906108c | 3342 | \f |
488f131b | 3343 | |
ec9499be | 3344 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3345 | |
568d6575 UW |
3346 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3347 | struct execution_control_state *ecs); | |
3348 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3349 | struct execution_control_state *ecs); | |
4f5d7f63 | 3350 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3351 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3352 | struct frame_info *); |
611c83ae | 3353 | |
bdc36728 | 3354 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3355 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3356 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3357 | static void process_event_stop_test (struct execution_control_state *ecs); |
c4464ade | 3358 | static bool switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3359 | |
252fbfc8 PA |
3360 | /* This function is attached as a "thread_stop_requested" observer. |
3361 | Cleanup local state that assumed the PTID was to be resumed, and | |
3362 | report the stop to the frontend. */ | |
3363 | ||
2c0b251b | 3364 | static void |
252fbfc8 PA |
3365 | infrun_thread_stop_requested (ptid_t ptid) |
3366 | { | |
5b6d1e4f PA |
3367 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3368 | ||
c65d6b55 PA |
3369 | /* PTID was requested to stop. If the thread was already stopped, |
3370 | but the user/frontend doesn't know about that yet (e.g., the | |
3371 | thread had been temporarily paused for some step-over), set up | |
3372 | for reporting the stop now. */ | |
5b6d1e4f | 3373 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3374 | { |
3375 | if (tp->state != THREAD_RUNNING) | |
3376 | continue; | |
3377 | if (tp->executing) | |
3378 | continue; | |
c65d6b55 | 3379 | |
08036331 PA |
3380 | /* Remove matching threads from the step-over queue, so |
3381 | start_step_over doesn't try to resume them | |
3382 | automatically. */ | |
3383 | if (thread_is_in_step_over_chain (tp)) | |
28d5518b | 3384 | global_thread_step_over_chain_remove (tp); |
c65d6b55 | 3385 | |
08036331 PA |
3386 | /* If the thread is stopped, but the user/frontend doesn't |
3387 | know about that yet, queue a pending event, as if the | |
3388 | thread had just stopped now. Unless the thread already had | |
3389 | a pending event. */ | |
3390 | if (!tp->suspend.waitstatus_pending_p) | |
3391 | { | |
3392 | tp->suspend.waitstatus_pending_p = 1; | |
3393 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3394 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3395 | } | |
c65d6b55 | 3396 | |
08036331 PA |
3397 | /* Clear the inline-frame state, since we're re-processing the |
3398 | stop. */ | |
5b6d1e4f | 3399 | clear_inline_frame_state (tp); |
c65d6b55 | 3400 | |
08036331 PA |
3401 | /* If this thread was paused because some other thread was |
3402 | doing an inline-step over, let that finish first. Once | |
3403 | that happens, we'll restart all threads and consume pending | |
3404 | stop events then. */ | |
3405 | if (step_over_info_valid_p ()) | |
3406 | continue; | |
3407 | ||
3408 | /* Otherwise we can process the (new) pending event now. Set | |
3409 | it so this pending event is considered by | |
3410 | do_target_wait. */ | |
719546c4 | 3411 | tp->resumed = true; |
08036331 | 3412 | } |
252fbfc8 PA |
3413 | } |
3414 | ||
a07daef3 PA |
3415 | static void |
3416 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3417 | { | |
5b6d1e4f PA |
3418 | if (target_last_proc_target == tp->inf->process_target () |
3419 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3420 | nullify_last_target_wait_ptid (); |
3421 | } | |
3422 | ||
0cbcdb96 PA |
3423 | /* Delete the step resume, single-step and longjmp/exception resume |
3424 | breakpoints of TP. */ | |
4e1c45ea | 3425 | |
0cbcdb96 PA |
3426 | static void |
3427 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3428 | { |
0cbcdb96 PA |
3429 | delete_step_resume_breakpoint (tp); |
3430 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3431 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3432 | } |
3433 | ||
0cbcdb96 PA |
3434 | /* If the target still has execution, call FUNC for each thread that |
3435 | just stopped. In all-stop, that's all the non-exited threads; in | |
3436 | non-stop, that's the current thread, only. */ | |
3437 | ||
3438 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3439 | (struct thread_info *tp); | |
4e1c45ea PA |
3440 | |
3441 | static void | |
0cbcdb96 | 3442 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3443 | { |
55f6301a | 3444 | if (!target_has_execution () || inferior_ptid == null_ptid) |
4e1c45ea PA |
3445 | return; |
3446 | ||
fbea99ea | 3447 | if (target_is_non_stop_p ()) |
4e1c45ea | 3448 | { |
0cbcdb96 PA |
3449 | /* If in non-stop mode, only the current thread stopped. */ |
3450 | func (inferior_thread ()); | |
4e1c45ea PA |
3451 | } |
3452 | else | |
0cbcdb96 | 3453 | { |
0cbcdb96 | 3454 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3455 | for (thread_info *tp : all_non_exited_threads ()) |
3456 | func (tp); | |
0cbcdb96 PA |
3457 | } |
3458 | } | |
3459 | ||
3460 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3461 | the threads that just stopped. */ | |
3462 | ||
3463 | static void | |
3464 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3465 | { | |
3466 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3467 | } |
3468 | ||
3469 | /* Delete the single-step breakpoints of the threads that just | |
3470 | stopped. */ | |
7c16b83e | 3471 | |
34b7e8a6 PA |
3472 | static void |
3473 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3474 | { | |
3475 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3476 | } |
3477 | ||
221e1a37 | 3478 | /* See infrun.h. */ |
223698f8 | 3479 | |
221e1a37 | 3480 | void |
223698f8 DE |
3481 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3482 | const struct target_waitstatus *ws) | |
3483 | { | |
e71daf80 SM |
3484 | infrun_debug_printf ("target_wait (%d.%ld.%ld [%s], status) =", |
3485 | waiton_ptid.pid (), | |
3486 | waiton_ptid.lwp (), | |
3487 | waiton_ptid.tid (), | |
3488 | target_pid_to_str (waiton_ptid).c_str ()); | |
3489 | infrun_debug_printf (" %d.%ld.%ld [%s],", | |
3490 | result_ptid.pid (), | |
3491 | result_ptid.lwp (), | |
3492 | result_ptid.tid (), | |
3493 | target_pid_to_str (result_ptid).c_str ()); | |
3494 | infrun_debug_printf (" %s", target_waitstatus_to_string (ws).c_str ()); | |
223698f8 DE |
3495 | } |
3496 | ||
372316f1 PA |
3497 | /* Select a thread at random, out of those which are resumed and have |
3498 | had events. */ | |
3499 | ||
3500 | static struct thread_info * | |
5b6d1e4f | 3501 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3502 | { |
372316f1 | 3503 | int num_events = 0; |
08036331 | 3504 | |
5b6d1e4f | 3505 | auto has_event = [&] (thread_info *tp) |
08036331 | 3506 | { |
5b6d1e4f PA |
3507 | return (tp->ptid.matches (waiton_ptid) |
3508 | && tp->resumed | |
08036331 PA |
3509 | && tp->suspend.waitstatus_pending_p); |
3510 | }; | |
372316f1 PA |
3511 | |
3512 | /* First see how many events we have. Count only resumed threads | |
3513 | that have an event pending. */ | |
5b6d1e4f | 3514 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3515 | if (has_event (tp)) |
372316f1 PA |
3516 | num_events++; |
3517 | ||
3518 | if (num_events == 0) | |
3519 | return NULL; | |
3520 | ||
3521 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3522 | int random_selector = (int) ((num_events * (double) rand ()) |
3523 | / (RAND_MAX + 1.0)); | |
372316f1 | 3524 | |
1eb8556f SM |
3525 | if (num_events > 1) |
3526 | infrun_debug_printf ("Found %d events, selecting #%d", | |
3527 | num_events, random_selector); | |
372316f1 PA |
3528 | |
3529 | /* Select the Nth thread that has had an event. */ | |
5b6d1e4f | 3530 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3531 | if (has_event (tp)) |
372316f1 | 3532 | if (random_selector-- == 0) |
08036331 | 3533 | return tp; |
372316f1 | 3534 | |
08036331 | 3535 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3536 | } |
3537 | ||
3538 | /* Wrapper for target_wait that first checks whether threads have | |
3539 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3540 | more events. INF is the inferior we're using to call target_wait |
3541 | on. */ | |
372316f1 PA |
3542 | |
3543 | static ptid_t | |
5b6d1e4f | 3544 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
b60cea74 | 3545 | target_waitstatus *status, target_wait_flags options) |
372316f1 PA |
3546 | { |
3547 | ptid_t event_ptid; | |
3548 | struct thread_info *tp; | |
3549 | ||
24ed6739 AB |
3550 | /* We know that we are looking for an event in the target of inferior |
3551 | INF, but we don't know which thread the event might come from. As | |
3552 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3553 | the wait code relies on it - doing so is always a mistake. */ | |
3554 | switch_to_inferior_no_thread (inf); | |
3555 | ||
372316f1 PA |
3556 | /* First check if there is a resumed thread with a wait status |
3557 | pending. */ | |
d7e15655 | 3558 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3559 | { |
5b6d1e4f | 3560 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3561 | } |
3562 | else | |
3563 | { | |
1eb8556f SM |
3564 | infrun_debug_printf ("Waiting for specific thread %s.", |
3565 | target_pid_to_str (ptid).c_str ()); | |
372316f1 PA |
3566 | |
3567 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3568 | tp = find_thread_ptid (inf, ptid); |
372316f1 PA |
3569 | gdb_assert (tp != NULL); |
3570 | if (!tp->suspend.waitstatus_pending_p) | |
3571 | tp = NULL; | |
3572 | } | |
3573 | ||
3574 | if (tp != NULL | |
3575 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3576 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3577 | { | |
00431a78 | 3578 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3579 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3580 | CORE_ADDR pc; |
3581 | int discard = 0; | |
3582 | ||
3583 | pc = regcache_read_pc (regcache); | |
3584 | ||
3585 | if (pc != tp->suspend.stop_pc) | |
3586 | { | |
1eb8556f SM |
3587 | infrun_debug_printf ("PC of %s changed. was=%s, now=%s", |
3588 | target_pid_to_str (tp->ptid).c_str (), | |
3589 | paddress (gdbarch, tp->suspend.stop_pc), | |
3590 | paddress (gdbarch, pc)); | |
372316f1 PA |
3591 | discard = 1; |
3592 | } | |
a01bda52 | 3593 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 | 3594 | { |
1eb8556f SM |
3595 | infrun_debug_printf ("previous breakpoint of %s, at %s gone", |
3596 | target_pid_to_str (tp->ptid).c_str (), | |
3597 | paddress (gdbarch, pc)); | |
372316f1 PA |
3598 | |
3599 | discard = 1; | |
3600 | } | |
3601 | ||
3602 | if (discard) | |
3603 | { | |
1eb8556f SM |
3604 | infrun_debug_printf ("pending event of %s cancelled.", |
3605 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3606 | |
3607 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3608 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3609 | } | |
3610 | } | |
3611 | ||
3612 | if (tp != NULL) | |
3613 | { | |
1eb8556f SM |
3614 | infrun_debug_printf ("Using pending wait status %s for %s.", |
3615 | target_waitstatus_to_string | |
3616 | (&tp->suspend.waitstatus).c_str (), | |
3617 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3618 | |
3619 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3620 | if it was a software breakpoint (and the target doesn't | |
3621 | always adjust the PC itself). */ | |
3622 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3623 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3624 | { | |
3625 | struct regcache *regcache; | |
3626 | struct gdbarch *gdbarch; | |
3627 | int decr_pc; | |
3628 | ||
00431a78 | 3629 | regcache = get_thread_regcache (tp); |
ac7936df | 3630 | gdbarch = regcache->arch (); |
372316f1 PA |
3631 | |
3632 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3633 | if (decr_pc != 0) | |
3634 | { | |
3635 | CORE_ADDR pc; | |
3636 | ||
3637 | pc = regcache_read_pc (regcache); | |
3638 | regcache_write_pc (regcache, pc + decr_pc); | |
3639 | } | |
3640 | } | |
3641 | ||
3642 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3643 | *status = tp->suspend.waitstatus; | |
3644 | tp->suspend.waitstatus_pending_p = 0; | |
3645 | ||
3646 | /* Wake up the event loop again, until all pending events are | |
3647 | processed. */ | |
3648 | if (target_is_async_p ()) | |
3649 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3650 | return tp->ptid; | |
3651 | } | |
3652 | ||
3653 | /* But if we don't find one, we'll have to wait. */ | |
3654 | ||
d3a07122 SM |
3655 | /* We can't ask a non-async target to do a non-blocking wait, so this will be |
3656 | a blocking wait. */ | |
3657 | if (!target_can_async_p ()) | |
3658 | options &= ~TARGET_WNOHANG; | |
3659 | ||
372316f1 PA |
3660 | if (deprecated_target_wait_hook) |
3661 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3662 | else | |
3663 | event_ptid = target_wait (ptid, status, options); | |
3664 | ||
3665 | return event_ptid; | |
3666 | } | |
3667 | ||
5b6d1e4f PA |
3668 | /* Wrapper for target_wait that first checks whether threads have |
3669 | pending statuses to report before actually asking the target for | |
b3e3a4c1 | 3670 | more events. Polls for events from all inferiors/targets. */ |
5b6d1e4f PA |
3671 | |
3672 | static bool | |
ac0d67ed | 3673 | do_target_wait (execution_control_state *ecs, target_wait_flags options) |
5b6d1e4f PA |
3674 | { |
3675 | int num_inferiors = 0; | |
3676 | int random_selector; | |
3677 | ||
b3e3a4c1 SM |
3678 | /* For fairness, we pick the first inferior/target to poll at random |
3679 | out of all inferiors that may report events, and then continue | |
3680 | polling the rest of the inferior list starting from that one in a | |
3681 | circular fashion until the whole list is polled once. */ | |
5b6d1e4f | 3682 | |
ac0d67ed | 3683 | auto inferior_matches = [] (inferior *inf) |
5b6d1e4f | 3684 | { |
ac0d67ed | 3685 | return inf->process_target () != nullptr; |
5b6d1e4f PA |
3686 | }; |
3687 | ||
b3e3a4c1 | 3688 | /* First see how many matching inferiors we have. */ |
5b6d1e4f PA |
3689 | for (inferior *inf : all_inferiors ()) |
3690 | if (inferior_matches (inf)) | |
3691 | num_inferiors++; | |
3692 | ||
3693 | if (num_inferiors == 0) | |
3694 | { | |
3695 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3696 | return false; | |
3697 | } | |
3698 | ||
b3e3a4c1 | 3699 | /* Now randomly pick an inferior out of those that matched. */ |
5b6d1e4f PA |
3700 | random_selector = (int) |
3701 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3702 | ||
1eb8556f SM |
3703 | if (num_inferiors > 1) |
3704 | infrun_debug_printf ("Found %d inferiors, starting at #%d", | |
3705 | num_inferiors, random_selector); | |
5b6d1e4f | 3706 | |
b3e3a4c1 | 3707 | /* Select the Nth inferior that matched. */ |
5b6d1e4f PA |
3708 | |
3709 | inferior *selected = nullptr; | |
3710 | ||
3711 | for (inferior *inf : all_inferiors ()) | |
3712 | if (inferior_matches (inf)) | |
3713 | if (random_selector-- == 0) | |
3714 | { | |
3715 | selected = inf; | |
3716 | break; | |
3717 | } | |
3718 | ||
b3e3a4c1 | 3719 | /* Now poll for events out of each of the matching inferior's |
5b6d1e4f PA |
3720 | targets, starting from the selected one. */ |
3721 | ||
3722 | auto do_wait = [&] (inferior *inf) | |
3723 | { | |
ac0d67ed | 3724 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, options); |
5b6d1e4f PA |
3725 | ecs->target = inf->process_target (); |
3726 | return (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3727 | }; | |
3728 | ||
b3e3a4c1 SM |
3729 | /* Needed in 'all-stop + target-non-stop' mode, because we end up |
3730 | here spuriously after the target is all stopped and we've already | |
5b6d1e4f PA |
3731 | reported the stop to the user, polling for events. */ |
3732 | scoped_restore_current_thread restore_thread; | |
3733 | ||
3734 | int inf_num = selected->num; | |
3735 | for (inferior *inf = selected; inf != NULL; inf = inf->next) | |
3736 | if (inferior_matches (inf)) | |
3737 | if (do_wait (inf)) | |
3738 | return true; | |
3739 | ||
3740 | for (inferior *inf = inferior_list; | |
3741 | inf != NULL && inf->num < inf_num; | |
3742 | inf = inf->next) | |
3743 | if (inferior_matches (inf)) | |
3744 | if (do_wait (inf)) | |
3745 | return true; | |
3746 | ||
3747 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3748 | return false; | |
3749 | } | |
3750 | ||
8ff53139 PA |
3751 | /* An event reported by wait_one. */ |
3752 | ||
3753 | struct wait_one_event | |
3754 | { | |
3755 | /* The target the event came out of. */ | |
3756 | process_stratum_target *target; | |
3757 | ||
3758 | /* The PTID the event was for. */ | |
3759 | ptid_t ptid; | |
3760 | ||
3761 | /* The waitstatus. */ | |
3762 | target_waitstatus ws; | |
3763 | }; | |
3764 | ||
3765 | static bool handle_one (const wait_one_event &event); | |
ac7d717c | 3766 | static void restart_threads (struct thread_info *event_thread); |
8ff53139 | 3767 | |
24291992 PA |
3768 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3769 | detaching while a thread is displaced stepping is a recipe for | |
3770 | crashing it, as nothing would readjust the PC out of the scratch | |
3771 | pad. */ | |
3772 | ||
3773 | void | |
3774 | prepare_for_detach (void) | |
3775 | { | |
3776 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3777 | ptid_t pid_ptid = ptid_t (inf->pid); |
8ff53139 | 3778 | scoped_restore_current_thread restore_thread; |
24291992 | 3779 | |
9bcb1f16 | 3780 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3781 | |
8ff53139 PA |
3782 | /* Remove all threads of INF from the global step-over chain. We |
3783 | want to stop any ongoing step-over, not start any new one. */ | |
3784 | thread_info *next; | |
3785 | for (thread_info *tp = global_thread_step_over_chain_head; | |
3786 | tp != nullptr; | |
3787 | tp = next) | |
24291992 | 3788 | { |
8ff53139 PA |
3789 | next = global_thread_step_over_chain_next (tp); |
3790 | if (tp->inf == inf) | |
3791 | global_thread_step_over_chain_remove (tp); | |
3792 | } | |
24291992 | 3793 | |
ac7d717c PA |
3794 | /* If we were already in the middle of an inline step-over, and the |
3795 | thread stepping belongs to the inferior we're detaching, we need | |
3796 | to restart the threads of other inferiors. */ | |
3797 | if (step_over_info.thread != -1) | |
3798 | { | |
3799 | infrun_debug_printf ("inline step-over in-process while detaching"); | |
3800 | ||
3801 | thread_info *thr = find_thread_global_id (step_over_info.thread); | |
3802 | if (thr->inf == inf) | |
3803 | { | |
3804 | /* Since we removed threads of INF from the step-over chain, | |
3805 | we know this won't start a step-over for INF. */ | |
3806 | clear_step_over_info (); | |
3807 | ||
3808 | if (target_is_non_stop_p ()) | |
3809 | { | |
3810 | /* Start a new step-over in another thread if there's | |
3811 | one that needs it. */ | |
3812 | start_step_over (); | |
3813 | ||
3814 | /* Restart all other threads (except the | |
3815 | previously-stepping thread, since that one is still | |
3816 | running). */ | |
3817 | if (!step_over_info_valid_p ()) | |
3818 | restart_threads (thr); | |
3819 | } | |
3820 | } | |
3821 | } | |
3822 | ||
8ff53139 PA |
3823 | if (displaced_step_in_progress (inf)) |
3824 | { | |
3825 | infrun_debug_printf ("displaced-stepping in-process while detaching"); | |
24291992 | 3826 | |
8ff53139 | 3827 | /* Stop threads currently displaced stepping, aborting it. */ |
24291992 | 3828 | |
8ff53139 PA |
3829 | for (thread_info *thr : inf->non_exited_threads ()) |
3830 | { | |
3831 | if (thr->displaced_step_state.in_progress ()) | |
3832 | { | |
3833 | if (thr->executing) | |
3834 | { | |
3835 | if (!thr->stop_requested) | |
3836 | { | |
3837 | target_stop (thr->ptid); | |
3838 | thr->stop_requested = true; | |
3839 | } | |
3840 | } | |
3841 | else | |
3842 | thr->resumed = false; | |
3843 | } | |
3844 | } | |
24291992 | 3845 | |
8ff53139 PA |
3846 | while (displaced_step_in_progress (inf)) |
3847 | { | |
3848 | wait_one_event event; | |
24291992 | 3849 | |
8ff53139 PA |
3850 | event.target = inf->process_target (); |
3851 | event.ptid = do_target_wait_1 (inf, pid_ptid, &event.ws, 0); | |
24291992 | 3852 | |
8ff53139 PA |
3853 | if (debug_infrun) |
3854 | print_target_wait_results (pid_ptid, event.ptid, &event.ws); | |
24291992 | 3855 | |
8ff53139 PA |
3856 | handle_one (event); |
3857 | } | |
24291992 | 3858 | |
8ff53139 PA |
3859 | /* It's OK to leave some of the threads of INF stopped, since |
3860 | they'll be detached shortly. */ | |
24291992 | 3861 | } |
24291992 PA |
3862 | } |
3863 | ||
cd0fc7c3 | 3864 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3865 | |
cd0fc7c3 SS |
3866 | If inferior gets a signal, we may decide to start it up again |
3867 | instead of returning. That is why there is a loop in this function. | |
3868 | When this function actually returns it means the inferior | |
3869 | should be left stopped and GDB should read more commands. */ | |
3870 | ||
5b6d1e4f PA |
3871 | static void |
3872 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3873 | { |
1eb8556f | 3874 | infrun_debug_printf ("wait_for_inferior ()"); |
527159b7 | 3875 | |
4c41382a | 3876 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3877 | |
e6f5c25b PA |
3878 | /* If an error happens while handling the event, propagate GDB's |
3879 | knowledge of the executing state to the frontend/user running | |
3880 | state. */ | |
5b6d1e4f PA |
3881 | scoped_finish_thread_state finish_state |
3882 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 3883 | |
c906108c SS |
3884 | while (1) |
3885 | { | |
ae25568b PA |
3886 | struct execution_control_state ecss; |
3887 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 3888 | |
ae25568b PA |
3889 | memset (ecs, 0, sizeof (*ecs)); |
3890 | ||
ec9499be | 3891 | overlay_cache_invalid = 1; |
ec9499be | 3892 | |
f15cb84a YQ |
3893 | /* Flush target cache before starting to handle each event. |
3894 | Target was running and cache could be stale. This is just a | |
3895 | heuristic. Running threads may modify target memory, but we | |
3896 | don't get any event. */ | |
3897 | target_dcache_invalidate (); | |
3898 | ||
5b6d1e4f PA |
3899 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
3900 | ecs->target = inf->process_target (); | |
c906108c | 3901 | |
f00150c9 | 3902 | if (debug_infrun) |
5b6d1e4f | 3903 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3904 | |
cd0fc7c3 SS |
3905 | /* Now figure out what to do with the result of the result. */ |
3906 | handle_inferior_event (ecs); | |
c906108c | 3907 | |
cd0fc7c3 SS |
3908 | if (!ecs->wait_some_more) |
3909 | break; | |
3910 | } | |
4e1c45ea | 3911 | |
e6f5c25b | 3912 | /* No error, don't finish the state yet. */ |
731f534f | 3913 | finish_state.release (); |
cd0fc7c3 | 3914 | } |
c906108c | 3915 | |
d3d4baed PA |
3916 | /* Cleanup that reinstalls the readline callback handler, if the |
3917 | target is running in the background. If while handling the target | |
3918 | event something triggered a secondary prompt, like e.g., a | |
3919 | pagination prompt, we'll have removed the callback handler (see | |
3920 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3921 | event loop, ready to process further input. Note this has no | |
3922 | effect if the handler hasn't actually been removed, because calling | |
3923 | rl_callback_handler_install resets the line buffer, thus losing | |
3924 | input. */ | |
3925 | ||
3926 | static void | |
d238133d | 3927 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 3928 | { |
3b12939d PA |
3929 | struct ui *ui = current_ui; |
3930 | ||
3931 | if (!ui->async) | |
6c400b59 PA |
3932 | { |
3933 | /* We're not going back to the top level event loop yet. Don't | |
3934 | install the readline callback, as it'd prep the terminal, | |
3935 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3936 | it the next time the prompt is displayed, when we're ready | |
3937 | for input. */ | |
3938 | return; | |
3939 | } | |
3940 | ||
3b12939d | 3941 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3942 | gdb_rl_callback_handler_reinstall (); |
3943 | } | |
3944 | ||
243a9253 PA |
3945 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3946 | that's just the event thread. In all-stop, that's all threads. */ | |
3947 | ||
3948 | static void | |
3949 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3950 | { | |
08036331 PA |
3951 | if (ecs->event_thread != NULL |
3952 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 3953 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
3954 | |
3955 | if (!non_stop) | |
3956 | { | |
08036331 | 3957 | for (thread_info *thr : all_non_exited_threads ()) |
dda83cd7 | 3958 | { |
243a9253 PA |
3959 | if (thr->thread_fsm == NULL) |
3960 | continue; | |
3961 | if (thr == ecs->event_thread) | |
3962 | continue; | |
3963 | ||
00431a78 | 3964 | switch_to_thread (thr); |
46e3ed7f | 3965 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
3966 | } |
3967 | ||
3968 | if (ecs->event_thread != NULL) | |
00431a78 | 3969 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3970 | } |
3971 | } | |
3972 | ||
3b12939d PA |
3973 | /* Helper for all_uis_check_sync_execution_done that works on the |
3974 | current UI. */ | |
3975 | ||
3976 | static void | |
3977 | check_curr_ui_sync_execution_done (void) | |
3978 | { | |
3979 | struct ui *ui = current_ui; | |
3980 | ||
3981 | if (ui->prompt_state == PROMPT_NEEDED | |
3982 | && ui->async | |
3983 | && !gdb_in_secondary_prompt_p (ui)) | |
3984 | { | |
223ffa71 | 3985 | target_terminal::ours (); |
76727919 | 3986 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3987 | ui_register_input_event_handler (ui); |
3b12939d PA |
3988 | } |
3989 | } | |
3990 | ||
3991 | /* See infrun.h. */ | |
3992 | ||
3993 | void | |
3994 | all_uis_check_sync_execution_done (void) | |
3995 | { | |
0e454242 | 3996 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3997 | { |
3998 | check_curr_ui_sync_execution_done (); | |
3999 | } | |
4000 | } | |
4001 | ||
a8836c93 PA |
4002 | /* See infrun.h. */ |
4003 | ||
4004 | void | |
4005 | all_uis_on_sync_execution_starting (void) | |
4006 | { | |
0e454242 | 4007 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
4008 | { |
4009 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
4010 | async_disable_stdin (); | |
4011 | } | |
4012 | } | |
4013 | ||
1777feb0 | 4014 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 4015 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
4016 | descriptor corresponding to the target. It can be called more than |
4017 | once to complete a single execution command. In such cases we need | |
4018 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
4019 | that this function is called for a single execution command, then |
4020 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 4021 | necessary cleanups. */ |
43ff13b4 JM |
4022 | |
4023 | void | |
b1a35af2 | 4024 | fetch_inferior_event () |
43ff13b4 | 4025 | { |
3ec3145c SM |
4026 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
4027 | ||
0d1e5fa7 | 4028 | struct execution_control_state ecss; |
a474d7c2 | 4029 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 4030 | int cmd_done = 0; |
43ff13b4 | 4031 | |
0d1e5fa7 PA |
4032 | memset (ecs, 0, sizeof (*ecs)); |
4033 | ||
c61db772 PA |
4034 | /* Events are always processed with the main UI as current UI. This |
4035 | way, warnings, debug output, etc. are always consistently sent to | |
4036 | the main console. */ | |
4b6749b9 | 4037 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 4038 | |
b78b3a29 TBA |
4039 | /* Temporarily disable pagination. Otherwise, the user would be |
4040 | given an option to press 'q' to quit, which would cause an early | |
4041 | exit and could leave GDB in a half-baked state. */ | |
4042 | scoped_restore save_pagination | |
4043 | = make_scoped_restore (&pagination_enabled, false); | |
4044 | ||
d3d4baed | 4045 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
4046 | { |
4047 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
4048 | ||
4049 | /* We're handling a live event, so make sure we're doing live | |
4050 | debugging. If we're looking at traceframes while the target is | |
4051 | running, we're going to need to get back to that mode after | |
4052 | handling the event. */ | |
4053 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
4054 | if (non_stop) | |
4055 | { | |
4056 | maybe_restore_traceframe.emplace (); | |
4057 | set_current_traceframe (-1); | |
4058 | } | |
43ff13b4 | 4059 | |
873657b9 PA |
4060 | /* The user/frontend should not notice a thread switch due to |
4061 | internal events. Make sure we revert to the user selected | |
4062 | thread and frame after handling the event and running any | |
4063 | breakpoint commands. */ | |
4064 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
4065 | |
4066 | overlay_cache_invalid = 1; | |
4067 | /* Flush target cache before starting to handle each event. Target | |
4068 | was running and cache could be stale. This is just a heuristic. | |
4069 | Running threads may modify target memory, but we don't get any | |
4070 | event. */ | |
4071 | target_dcache_invalidate (); | |
4072 | ||
4073 | scoped_restore save_exec_dir | |
4074 | = make_scoped_restore (&execution_direction, | |
4075 | target_execution_direction ()); | |
4076 | ||
1192f124 SM |
4077 | /* Allow targets to pause their resumed threads while we handle |
4078 | the event. */ | |
4079 | scoped_disable_commit_resumed disable_commit_resumed ("handling event"); | |
4080 | ||
ac0d67ed | 4081 | if (!do_target_wait (ecs, TARGET_WNOHANG)) |
1192f124 SM |
4082 | { |
4083 | infrun_debug_printf ("do_target_wait returned no event"); | |
4084 | disable_commit_resumed.reset_and_commit (); | |
4085 | return; | |
4086 | } | |
5b6d1e4f PA |
4087 | |
4088 | gdb_assert (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
4089 | ||
4090 | /* Switch to the target that generated the event, so we can do | |
7f08fd51 TBA |
4091 | target calls. */ |
4092 | switch_to_target_no_thread (ecs->target); | |
d238133d TT |
4093 | |
4094 | if (debug_infrun) | |
5b6d1e4f | 4095 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
d238133d TT |
4096 | |
4097 | /* If an error happens while handling the event, propagate GDB's | |
4098 | knowledge of the executing state to the frontend/user running | |
4099 | state. */ | |
4100 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 4101 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 4102 | |
979a0d13 | 4103 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
4104 | still for the thread which has thrown the exception. */ |
4105 | auto defer_bpstat_clear | |
4106 | = make_scope_exit (bpstat_clear_actions); | |
4107 | auto defer_delete_threads | |
4108 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
4109 | ||
4110 | /* Now figure out what to do with the result of the result. */ | |
4111 | handle_inferior_event (ecs); | |
4112 | ||
4113 | if (!ecs->wait_some_more) | |
4114 | { | |
5b6d1e4f | 4115 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
758cb810 | 4116 | bool should_stop = true; |
d238133d | 4117 | struct thread_info *thr = ecs->event_thread; |
d6b48e9c | 4118 | |
d238133d | 4119 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 4120 | |
d238133d TT |
4121 | if (thr != NULL) |
4122 | { | |
4123 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 4124 | |
d238133d | 4125 | if (thread_fsm != NULL) |
46e3ed7f | 4126 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 4127 | } |
243a9253 | 4128 | |
d238133d TT |
4129 | if (!should_stop) |
4130 | { | |
4131 | keep_going (ecs); | |
4132 | } | |
4133 | else | |
4134 | { | |
46e3ed7f | 4135 | bool should_notify_stop = true; |
d238133d | 4136 | int proceeded = 0; |
1840d81a | 4137 | |
d238133d | 4138 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 4139 | |
d238133d | 4140 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 4141 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 4142 | |
d238133d TT |
4143 | if (should_notify_stop) |
4144 | { | |
4145 | /* We may not find an inferior if this was a process exit. */ | |
4146 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
4147 | proceeded = normal_stop (); | |
4148 | } | |
243a9253 | 4149 | |
d238133d TT |
4150 | if (!proceeded) |
4151 | { | |
b1a35af2 | 4152 | inferior_event_handler (INF_EXEC_COMPLETE); |
d238133d TT |
4153 | cmd_done = 1; |
4154 | } | |
873657b9 PA |
4155 | |
4156 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
4157 | previously selected thread is gone. We have two | |
4158 | choices - switch to no thread selected, or restore the | |
4159 | previously selected thread (now exited). We chose the | |
4160 | later, just because that's what GDB used to do. After | |
4161 | this, "info threads" says "The current thread <Thread | |
4162 | ID 2> has terminated." instead of "No thread | |
4163 | selected.". */ | |
4164 | if (!non_stop | |
4165 | && cmd_done | |
4166 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
4167 | restore_thread.dont_restore (); | |
d238133d TT |
4168 | } |
4169 | } | |
4f8d22e3 | 4170 | |
d238133d TT |
4171 | defer_delete_threads.release (); |
4172 | defer_bpstat_clear.release (); | |
29f49a6a | 4173 | |
d238133d TT |
4174 | /* No error, don't finish the thread states yet. */ |
4175 | finish_state.release (); | |
731f534f | 4176 | |
1192f124 SM |
4177 | disable_commit_resumed.reset_and_commit (); |
4178 | ||
d238133d TT |
4179 | /* This scope is used to ensure that readline callbacks are |
4180 | reinstalled here. */ | |
4181 | } | |
4f8d22e3 | 4182 | |
3b12939d PA |
4183 | /* If a UI was in sync execution mode, and now isn't, restore its |
4184 | prompt (a synchronous execution command has finished, and we're | |
4185 | ready for input). */ | |
4186 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4187 | |
4188 | if (cmd_done | |
0f641c01 | 4189 | && exec_done_display_p |
00431a78 PA |
4190 | && (inferior_ptid == null_ptid |
4191 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 4192 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
4193 | } |
4194 | ||
29734269 SM |
4195 | /* See infrun.h. */ |
4196 | ||
edb3359d | 4197 | void |
29734269 SM |
4198 | set_step_info (thread_info *tp, struct frame_info *frame, |
4199 | struct symtab_and_line sal) | |
edb3359d | 4200 | { |
29734269 SM |
4201 | /* This can be removed once this function no longer implicitly relies on the |
4202 | inferior_ptid value. */ | |
4203 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4204 | |
16c381f0 JK |
4205 | tp->control.step_frame_id = get_frame_id (frame); |
4206 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4207 | |
4208 | tp->current_symtab = sal.symtab; | |
4209 | tp->current_line = sal.line; | |
4210 | } | |
4211 | ||
0d1e5fa7 PA |
4212 | /* Clear context switchable stepping state. */ |
4213 | ||
4214 | void | |
4e1c45ea | 4215 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4216 | { |
7f5ef605 | 4217 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4218 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4219 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4220 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4221 | } |
4222 | ||
ab1ddbcf | 4223 | /* See infrun.h. */ |
c32c64b7 | 4224 | |
6efcd9a8 | 4225 | void |
5b6d1e4f PA |
4226 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
4227 | target_waitstatus status) | |
c32c64b7 | 4228 | { |
5b6d1e4f | 4229 | target_last_proc_target = target; |
c32c64b7 DE |
4230 | target_last_wait_ptid = ptid; |
4231 | target_last_waitstatus = status; | |
4232 | } | |
4233 | ||
ab1ddbcf | 4234 | /* See infrun.h. */ |
e02bc4cc DS |
4235 | |
4236 | void | |
5b6d1e4f PA |
4237 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4238 | target_waitstatus *status) | |
e02bc4cc | 4239 | { |
5b6d1e4f PA |
4240 | if (target != nullptr) |
4241 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4242 | if (ptid != nullptr) |
4243 | *ptid = target_last_wait_ptid; | |
4244 | if (status != nullptr) | |
4245 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4246 | } |
4247 | ||
ab1ddbcf PA |
4248 | /* See infrun.h. */ |
4249 | ||
ac264b3b MS |
4250 | void |
4251 | nullify_last_target_wait_ptid (void) | |
4252 | { | |
5b6d1e4f | 4253 | target_last_proc_target = nullptr; |
ac264b3b | 4254 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4255 | target_last_waitstatus = {}; |
ac264b3b MS |
4256 | } |
4257 | ||
dcf4fbde | 4258 | /* Switch thread contexts. */ |
dd80620e MS |
4259 | |
4260 | static void | |
00431a78 | 4261 | context_switch (execution_control_state *ecs) |
dd80620e | 4262 | { |
1eb8556f | 4263 | if (ecs->ptid != inferior_ptid |
5b6d1e4f PA |
4264 | && (inferior_ptid == null_ptid |
4265 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 | 4266 | { |
1eb8556f SM |
4267 | infrun_debug_printf ("Switching context from %s to %s", |
4268 | target_pid_to_str (inferior_ptid).c_str (), | |
4269 | target_pid_to_str (ecs->ptid).c_str ()); | |
fd48f117 DJ |
4270 | } |
4271 | ||
00431a78 | 4272 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4273 | } |
4274 | ||
d8dd4d5f PA |
4275 | /* If the target can't tell whether we've hit breakpoints |
4276 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4277 | check whether that could have been caused by a breakpoint. If so, | |
4278 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4279 | ||
4fa8626c | 4280 | static void |
d8dd4d5f PA |
4281 | adjust_pc_after_break (struct thread_info *thread, |
4282 | struct target_waitstatus *ws) | |
4fa8626c | 4283 | { |
24a73cce UW |
4284 | struct regcache *regcache; |
4285 | struct gdbarch *gdbarch; | |
118e6252 | 4286 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4287 | |
4fa8626c DJ |
4288 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4289 | we aren't, just return. | |
9709f61c DJ |
4290 | |
4291 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4292 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4293 | implemented by software breakpoints should be handled through the normal | |
4294 | breakpoint layer. | |
8fb3e588 | 4295 | |
4fa8626c DJ |
4296 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4297 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4298 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4299 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4300 | generates these signals at breakpoints (the code has been in GDB since at | |
4301 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4302 | |
e6cf7916 UW |
4303 | In earlier versions of GDB, a target with |
4304 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4305 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4306 | target with both of these set in GDB history, and it seems unlikely to be | |
4307 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4308 | |
d8dd4d5f | 4309 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4310 | return; |
4311 | ||
d8dd4d5f | 4312 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4313 | return; |
4314 | ||
4058b839 PA |
4315 | /* In reverse execution, when a breakpoint is hit, the instruction |
4316 | under it has already been de-executed. The reported PC always | |
4317 | points at the breakpoint address, so adjusting it further would | |
4318 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4319 | architecture: | |
4320 | ||
4321 | B1 0x08000000 : INSN1 | |
4322 | B2 0x08000001 : INSN2 | |
4323 | 0x08000002 : INSN3 | |
4324 | PC -> 0x08000003 : INSN4 | |
4325 | ||
4326 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4327 | from that point should hit B2 as below. Reading the PC when the | |
4328 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4329 | been de-executed already. | |
4330 | ||
4331 | B1 0x08000000 : INSN1 | |
4332 | B2 PC -> 0x08000001 : INSN2 | |
4333 | 0x08000002 : INSN3 | |
4334 | 0x08000003 : INSN4 | |
4335 | ||
4336 | We can't apply the same logic as for forward execution, because | |
4337 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4338 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4339 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4340 | behaviour. */ | |
4341 | if (execution_direction == EXEC_REVERSE) | |
4342 | return; | |
4343 | ||
1cf4d951 PA |
4344 | /* If the target can tell whether the thread hit a SW breakpoint, |
4345 | trust it. Targets that can tell also adjust the PC | |
4346 | themselves. */ | |
4347 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4348 | return; | |
4349 | ||
4350 | /* Note that relying on whether a breakpoint is planted in memory to | |
4351 | determine this can fail. E.g,. the breakpoint could have been | |
4352 | removed since. Or the thread could have been told to step an | |
4353 | instruction the size of a breakpoint instruction, and only | |
4354 | _after_ was a breakpoint inserted at its address. */ | |
4355 | ||
24a73cce UW |
4356 | /* If this target does not decrement the PC after breakpoints, then |
4357 | we have nothing to do. */ | |
00431a78 | 4358 | regcache = get_thread_regcache (thread); |
ac7936df | 4359 | gdbarch = regcache->arch (); |
118e6252 | 4360 | |
527a273a | 4361 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4362 | if (decr_pc == 0) |
24a73cce UW |
4363 | return; |
4364 | ||
8b86c959 | 4365 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4366 | |
8aad930b AC |
4367 | /* Find the location where (if we've hit a breakpoint) the |
4368 | breakpoint would be. */ | |
118e6252 | 4369 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4370 | |
1cf4d951 PA |
4371 | /* If the target can't tell whether a software breakpoint triggered, |
4372 | fallback to figuring it out based on breakpoints we think were | |
4373 | inserted in the target, and on whether the thread was stepped or | |
4374 | continued. */ | |
4375 | ||
1c5cfe86 PA |
4376 | /* Check whether there actually is a software breakpoint inserted at |
4377 | that location. | |
4378 | ||
4379 | If in non-stop mode, a race condition is possible where we've | |
4380 | removed a breakpoint, but stop events for that breakpoint were | |
4381 | already queued and arrive later. To suppress those spurious | |
4382 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4383 | and retire them after a number of stop events are reported. Note |
4384 | this is an heuristic and can thus get confused. The real fix is | |
4385 | to get the "stopped by SW BP and needs adjustment" info out of | |
4386 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4387 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4388 | || (target_is_non_stop_p () |
4389 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4390 | { |
07036511 | 4391 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4392 | |
8213266a | 4393 | if (record_full_is_used ()) |
07036511 TT |
4394 | restore_operation_disable.emplace |
4395 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4396 | |
1c0fdd0e UW |
4397 | /* When using hardware single-step, a SIGTRAP is reported for both |
4398 | a completed single-step and a software breakpoint. Need to | |
4399 | differentiate between the two, as the latter needs adjusting | |
4400 | but the former does not. | |
4401 | ||
4402 | The SIGTRAP can be due to a completed hardware single-step only if | |
4403 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4404 | - this thread is currently being stepped |
4405 | ||
4406 | If any of these events did not occur, we must have stopped due | |
4407 | to hitting a software breakpoint, and have to back up to the | |
4408 | breakpoint address. | |
4409 | ||
4410 | As a special case, we could have hardware single-stepped a | |
4411 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4412 | we also need to back up to the breakpoint address. */ | |
4413 | ||
d8dd4d5f PA |
4414 | if (thread_has_single_step_breakpoints_set (thread) |
4415 | || !currently_stepping (thread) | |
4416 | || (thread->stepped_breakpoint | |
4417 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4418 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4419 | } |
4fa8626c DJ |
4420 | } |
4421 | ||
c4464ade | 4422 | static bool |
edb3359d DJ |
4423 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) |
4424 | { | |
4425 | for (frame = get_prev_frame (frame); | |
4426 | frame != NULL; | |
4427 | frame = get_prev_frame (frame)) | |
4428 | { | |
4429 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
c4464ade SM |
4430 | return true; |
4431 | ||
edb3359d DJ |
4432 | if (get_frame_type (frame) != INLINE_FRAME) |
4433 | break; | |
4434 | } | |
4435 | ||
c4464ade | 4436 | return false; |
edb3359d DJ |
4437 | } |
4438 | ||
4a4c04f1 BE |
4439 | /* Look for an inline frame that is marked for skip. |
4440 | If PREV_FRAME is TRUE start at the previous frame, | |
4441 | otherwise start at the current frame. Stop at the | |
4442 | first non-inline frame, or at the frame where the | |
4443 | step started. */ | |
4444 | ||
4445 | static bool | |
4446 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4447 | { | |
4448 | struct frame_info *frame = get_current_frame (); | |
4449 | ||
4450 | if (prev_frame) | |
4451 | frame = get_prev_frame (frame); | |
4452 | ||
4453 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4454 | { | |
4455 | const char *fn = NULL; | |
4456 | symtab_and_line sal; | |
4457 | struct symbol *sym; | |
4458 | ||
4459 | if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id)) | |
4460 | break; | |
4461 | if (get_frame_type (frame) != INLINE_FRAME) | |
4462 | break; | |
4463 | ||
4464 | sal = find_frame_sal (frame); | |
4465 | sym = get_frame_function (frame); | |
4466 | ||
4467 | if (sym != NULL) | |
4468 | fn = sym->print_name (); | |
4469 | ||
4470 | if (sal.line != 0 | |
4471 | && function_name_is_marked_for_skip (fn, sal)) | |
4472 | return true; | |
4473 | } | |
4474 | ||
4475 | return false; | |
4476 | } | |
4477 | ||
c65d6b55 PA |
4478 | /* If the event thread has the stop requested flag set, pretend it |
4479 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4480 | target_stop). */ | |
4481 | ||
4482 | static bool | |
4483 | handle_stop_requested (struct execution_control_state *ecs) | |
4484 | { | |
4485 | if (ecs->event_thread->stop_requested) | |
4486 | { | |
4487 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4488 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4489 | handle_signal_stop (ecs); | |
4490 | return true; | |
4491 | } | |
4492 | return false; | |
4493 | } | |
4494 | ||
a96d9b2e | 4495 | /* Auxiliary function that handles syscall entry/return events. |
c4464ade SM |
4496 | It returns true if the inferior should keep going (and GDB |
4497 | should ignore the event), or false if the event deserves to be | |
a96d9b2e | 4498 | processed. */ |
ca2163eb | 4499 | |
c4464ade | 4500 | static bool |
ca2163eb | 4501 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4502 | { |
ca2163eb | 4503 | struct regcache *regcache; |
ca2163eb PA |
4504 | int syscall_number; |
4505 | ||
00431a78 | 4506 | context_switch (ecs); |
ca2163eb | 4507 | |
00431a78 | 4508 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4509 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4510 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4511 | |
a96d9b2e SDJ |
4512 | if (catch_syscall_enabled () > 0 |
4513 | && catching_syscall_number (syscall_number) > 0) | |
4514 | { | |
1eb8556f | 4515 | infrun_debug_printf ("syscall number=%d", syscall_number); |
a96d9b2e | 4516 | |
16c381f0 | 4517 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4518 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4519 | ecs->event_thread->suspend.stop_pc, |
4520 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4521 | |
c65d6b55 | 4522 | if (handle_stop_requested (ecs)) |
c4464ade | 4523 | return false; |
c65d6b55 | 4524 | |
ce12b012 | 4525 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4526 | { |
4527 | /* Catchpoint hit. */ | |
c4464ade | 4528 | return false; |
ca2163eb | 4529 | } |
a96d9b2e | 4530 | } |
ca2163eb | 4531 | |
c65d6b55 | 4532 | if (handle_stop_requested (ecs)) |
c4464ade | 4533 | return false; |
c65d6b55 | 4534 | |
ca2163eb | 4535 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb | 4536 | keep_going (ecs); |
c4464ade SM |
4537 | |
4538 | return true; | |
a96d9b2e SDJ |
4539 | } |
4540 | ||
7e324e48 GB |
4541 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4542 | ||
4543 | static void | |
4544 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4545 | struct execution_control_state *ecs) | |
4546 | { | |
4547 | if (!ecs->stop_func_filled_in) | |
4548 | { | |
98a617f8 | 4549 | const block *block; |
fe830662 | 4550 | const general_symbol_info *gsi; |
98a617f8 | 4551 | |
7e324e48 GB |
4552 | /* Don't care about return value; stop_func_start and stop_func_name |
4553 | will both be 0 if it doesn't work. */ | |
fe830662 TT |
4554 | find_pc_partial_function_sym (ecs->event_thread->suspend.stop_pc, |
4555 | &gsi, | |
4556 | &ecs->stop_func_start, | |
4557 | &ecs->stop_func_end, | |
4558 | &block); | |
4559 | ecs->stop_func_name = gsi == nullptr ? nullptr : gsi->print_name (); | |
98a617f8 KB |
4560 | |
4561 | /* The call to find_pc_partial_function, above, will set | |
4562 | stop_func_start and stop_func_end to the start and end | |
4563 | of the range containing the stop pc. If this range | |
4564 | contains the entry pc for the block (which is always the | |
4565 | case for contiguous blocks), advance stop_func_start past | |
4566 | the function's start offset and entrypoint. Note that | |
4567 | stop_func_start is NOT advanced when in a range of a | |
4568 | non-contiguous block that does not contain the entry pc. */ | |
4569 | if (block != nullptr | |
4570 | && ecs->stop_func_start <= BLOCK_ENTRY_PC (block) | |
4571 | && BLOCK_ENTRY_PC (block) < ecs->stop_func_end) | |
4572 | { | |
4573 | ecs->stop_func_start | |
4574 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4575 | ||
4576 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4577 | ecs->stop_func_start | |
4578 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4579 | } | |
591a12a1 | 4580 | |
7e324e48 GB |
4581 | ecs->stop_func_filled_in = 1; |
4582 | } | |
4583 | } | |
4584 | ||
4f5d7f63 | 4585 | |
00431a78 | 4586 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4587 | |
4588 | static enum stop_kind | |
00431a78 | 4589 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4590 | { |
5b6d1e4f | 4591 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4592 | |
4593 | gdb_assert (inf != NULL); | |
4594 | return inf->control.stop_soon; | |
4595 | } | |
4596 | ||
5b6d1e4f PA |
4597 | /* Poll for one event out of the current target. Store the resulting |
4598 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4599 | |
4600 | static ptid_t | |
5b6d1e4f | 4601 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4602 | { |
4603 | ptid_t event_ptid; | |
372316f1 PA |
4604 | |
4605 | overlay_cache_invalid = 1; | |
4606 | ||
4607 | /* Flush target cache before starting to handle each event. | |
4608 | Target was running and cache could be stale. This is just a | |
4609 | heuristic. Running threads may modify target memory, but we | |
4610 | don't get any event. */ | |
4611 | target_dcache_invalidate (); | |
4612 | ||
4613 | if (deprecated_target_wait_hook) | |
5b6d1e4f | 4614 | event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 | 4615 | else |
5b6d1e4f | 4616 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4617 | |
4618 | if (debug_infrun) | |
5b6d1e4f | 4619 | print_target_wait_results (minus_one_ptid, event_ptid, ws); |
372316f1 PA |
4620 | |
4621 | return event_ptid; | |
4622 | } | |
4623 | ||
5b6d1e4f PA |
4624 | /* Wait for one event out of any target. */ |
4625 | ||
4626 | static wait_one_event | |
4627 | wait_one () | |
4628 | { | |
4629 | while (1) | |
4630 | { | |
4631 | for (inferior *inf : all_inferiors ()) | |
4632 | { | |
4633 | process_stratum_target *target = inf->process_target (); | |
4634 | if (target == NULL | |
4635 | || !target->is_async_p () | |
4636 | || !target->threads_executing) | |
4637 | continue; | |
4638 | ||
4639 | switch_to_inferior_no_thread (inf); | |
4640 | ||
4641 | wait_one_event event; | |
4642 | event.target = target; | |
4643 | event.ptid = poll_one_curr_target (&event.ws); | |
4644 | ||
4645 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4646 | { | |
4647 | /* If nothing is resumed, remove the target from the | |
4648 | event loop. */ | |
4649 | target_async (0); | |
4650 | } | |
4651 | else if (event.ws.kind != TARGET_WAITKIND_IGNORE) | |
4652 | return event; | |
4653 | } | |
4654 | ||
4655 | /* Block waiting for some event. */ | |
4656 | ||
4657 | fd_set readfds; | |
4658 | int nfds = 0; | |
4659 | ||
4660 | FD_ZERO (&readfds); | |
4661 | ||
4662 | for (inferior *inf : all_inferiors ()) | |
4663 | { | |
4664 | process_stratum_target *target = inf->process_target (); | |
4665 | if (target == NULL | |
4666 | || !target->is_async_p () | |
4667 | || !target->threads_executing) | |
4668 | continue; | |
4669 | ||
4670 | int fd = target->async_wait_fd (); | |
4671 | FD_SET (fd, &readfds); | |
4672 | if (nfds <= fd) | |
4673 | nfds = fd + 1; | |
4674 | } | |
4675 | ||
4676 | if (nfds == 0) | |
4677 | { | |
4678 | /* No waitable targets left. All must be stopped. */ | |
4679 | return {NULL, minus_one_ptid, {TARGET_WAITKIND_NO_RESUMED}}; | |
4680 | } | |
4681 | ||
4682 | QUIT; | |
4683 | ||
4684 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4685 | if (numfds < 0) | |
4686 | { | |
4687 | if (errno == EINTR) | |
4688 | continue; | |
4689 | else | |
4690 | perror_with_name ("interruptible_select"); | |
4691 | } | |
4692 | } | |
4693 | } | |
4694 | ||
372316f1 PA |
4695 | /* Save the thread's event and stop reason to process it later. */ |
4696 | ||
4697 | static void | |
5b6d1e4f | 4698 | save_waitstatus (struct thread_info *tp, const target_waitstatus *ws) |
372316f1 | 4699 | { |
1eb8556f SM |
4700 | infrun_debug_printf ("saving status %s for %d.%ld.%ld", |
4701 | target_waitstatus_to_string (ws).c_str (), | |
4702 | tp->ptid.pid (), | |
4703 | tp->ptid.lwp (), | |
4704 | tp->ptid.tid ()); | |
372316f1 PA |
4705 | |
4706 | /* Record for later. */ | |
4707 | tp->suspend.waitstatus = *ws; | |
4708 | tp->suspend.waitstatus_pending_p = 1; | |
4709 | ||
372316f1 PA |
4710 | if (ws->kind == TARGET_WAITKIND_STOPPED |
4711 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4712 | { | |
89ba430c SM |
4713 | struct regcache *regcache = get_thread_regcache (tp); |
4714 | const address_space *aspace = regcache->aspace (); | |
372316f1 PA |
4715 | CORE_ADDR pc = regcache_read_pc (regcache); |
4716 | ||
4717 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4718 | ||
18493a00 PA |
4719 | scoped_restore_current_thread restore_thread; |
4720 | switch_to_thread (tp); | |
4721 | ||
4722 | if (target_stopped_by_watchpoint ()) | |
372316f1 PA |
4723 | { |
4724 | tp->suspend.stop_reason | |
4725 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4726 | } | |
4727 | else if (target_supports_stopped_by_sw_breakpoint () | |
18493a00 | 4728 | && target_stopped_by_sw_breakpoint ()) |
372316f1 PA |
4729 | { |
4730 | tp->suspend.stop_reason | |
4731 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4732 | } | |
4733 | else if (target_supports_stopped_by_hw_breakpoint () | |
18493a00 | 4734 | && target_stopped_by_hw_breakpoint ()) |
372316f1 PA |
4735 | { |
4736 | tp->suspend.stop_reason | |
4737 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4738 | } | |
4739 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4740 | && hardware_breakpoint_inserted_here_p (aspace, | |
4741 | pc)) | |
4742 | { | |
4743 | tp->suspend.stop_reason | |
4744 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4745 | } | |
4746 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4747 | && software_breakpoint_inserted_here_p (aspace, | |
4748 | pc)) | |
4749 | { | |
4750 | tp->suspend.stop_reason | |
4751 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4752 | } | |
4753 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4754 | && currently_stepping (tp)) | |
4755 | { | |
4756 | tp->suspend.stop_reason | |
4757 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4758 | } | |
4759 | } | |
4760 | } | |
4761 | ||
293b3ebc TBA |
4762 | /* Mark the non-executing threads accordingly. In all-stop, all |
4763 | threads of all processes are stopped when we get any event | |
4764 | reported. In non-stop mode, only the event thread stops. */ | |
4765 | ||
4766 | static void | |
4767 | mark_non_executing_threads (process_stratum_target *target, | |
4768 | ptid_t event_ptid, | |
4769 | struct target_waitstatus ws) | |
4770 | { | |
4771 | ptid_t mark_ptid; | |
4772 | ||
4773 | if (!target_is_non_stop_p ()) | |
4774 | mark_ptid = minus_one_ptid; | |
4775 | else if (ws.kind == TARGET_WAITKIND_SIGNALLED | |
4776 | || ws.kind == TARGET_WAITKIND_EXITED) | |
4777 | { | |
4778 | /* If we're handling a process exit in non-stop mode, even | |
4779 | though threads haven't been deleted yet, one would think | |
4780 | that there is nothing to do, as threads of the dead process | |
4781 | will be soon deleted, and threads of any other process were | |
4782 | left running. However, on some targets, threads survive a | |
4783 | process exit event. E.g., for the "checkpoint" command, | |
4784 | when the current checkpoint/fork exits, linux-fork.c | |
4785 | automatically switches to another fork from within | |
4786 | target_mourn_inferior, by associating the same | |
4787 | inferior/thread to another fork. We haven't mourned yet at | |
4788 | this point, but we must mark any threads left in the | |
4789 | process as not-executing so that finish_thread_state marks | |
4790 | them stopped (in the user's perspective) if/when we present | |
4791 | the stop to the user. */ | |
4792 | mark_ptid = ptid_t (event_ptid.pid ()); | |
4793 | } | |
4794 | else | |
4795 | mark_ptid = event_ptid; | |
4796 | ||
4797 | set_executing (target, mark_ptid, false); | |
4798 | ||
4799 | /* Likewise the resumed flag. */ | |
4800 | set_resumed (target, mark_ptid, false); | |
4801 | } | |
4802 | ||
d758e62c PA |
4803 | /* Handle one event after stopping threads. If the eventing thread |
4804 | reports back any interesting event, we leave it pending. If the | |
4805 | eventing thread was in the middle of a displaced step, we | |
8ff53139 PA |
4806 | cancel/finish it, and unless the thread's inferior is being |
4807 | detached, put the thread back in the step-over chain. Returns true | |
4808 | if there are no resumed threads left in the target (thus there's no | |
4809 | point in waiting further), false otherwise. */ | |
d758e62c PA |
4810 | |
4811 | static bool | |
4812 | handle_one (const wait_one_event &event) | |
4813 | { | |
4814 | infrun_debug_printf | |
4815 | ("%s %s", target_waitstatus_to_string (&event.ws).c_str (), | |
4816 | target_pid_to_str (event.ptid).c_str ()); | |
4817 | ||
4818 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4819 | { | |
4820 | /* All resumed threads exited. */ | |
4821 | return true; | |
4822 | } | |
4823 | else if (event.ws.kind == TARGET_WAITKIND_THREAD_EXITED | |
4824 | || event.ws.kind == TARGET_WAITKIND_EXITED | |
4825 | || event.ws.kind == TARGET_WAITKIND_SIGNALLED) | |
4826 | { | |
4827 | /* One thread/process exited/signalled. */ | |
4828 | ||
4829 | thread_info *t = nullptr; | |
4830 | ||
4831 | /* The target may have reported just a pid. If so, try | |
4832 | the first non-exited thread. */ | |
4833 | if (event.ptid.is_pid ()) | |
4834 | { | |
4835 | int pid = event.ptid.pid (); | |
4836 | inferior *inf = find_inferior_pid (event.target, pid); | |
4837 | for (thread_info *tp : inf->non_exited_threads ()) | |
4838 | { | |
4839 | t = tp; | |
4840 | break; | |
4841 | } | |
4842 | ||
4843 | /* If there is no available thread, the event would | |
4844 | have to be appended to a per-inferior event list, | |
4845 | which does not exist (and if it did, we'd have | |
4846 | to adjust run control command to be able to | |
4847 | resume such an inferior). We assert here instead | |
4848 | of going into an infinite loop. */ | |
4849 | gdb_assert (t != nullptr); | |
4850 | ||
4851 | infrun_debug_printf | |
4852 | ("using %s", target_pid_to_str (t->ptid).c_str ()); | |
4853 | } | |
4854 | else | |
4855 | { | |
4856 | t = find_thread_ptid (event.target, event.ptid); | |
4857 | /* Check if this is the first time we see this thread. | |
4858 | Don't bother adding if it individually exited. */ | |
4859 | if (t == nullptr | |
4860 | && event.ws.kind != TARGET_WAITKIND_THREAD_EXITED) | |
4861 | t = add_thread (event.target, event.ptid); | |
4862 | } | |
4863 | ||
4864 | if (t != nullptr) | |
4865 | { | |
4866 | /* Set the threads as non-executing to avoid | |
4867 | another stop attempt on them. */ | |
4868 | switch_to_thread_no_regs (t); | |
4869 | mark_non_executing_threads (event.target, event.ptid, | |
4870 | event.ws); | |
4871 | save_waitstatus (t, &event.ws); | |
4872 | t->stop_requested = false; | |
4873 | } | |
4874 | } | |
4875 | else | |
4876 | { | |
4877 | thread_info *t = find_thread_ptid (event.target, event.ptid); | |
4878 | if (t == NULL) | |
4879 | t = add_thread (event.target, event.ptid); | |
4880 | ||
4881 | t->stop_requested = 0; | |
4882 | t->executing = 0; | |
4883 | t->resumed = false; | |
4884 | t->control.may_range_step = 0; | |
4885 | ||
4886 | /* This may be the first time we see the inferior report | |
4887 | a stop. */ | |
4888 | inferior *inf = find_inferior_ptid (event.target, event.ptid); | |
4889 | if (inf->needs_setup) | |
4890 | { | |
4891 | switch_to_thread_no_regs (t); | |
4892 | setup_inferior (0); | |
4893 | } | |
4894 | ||
4895 | if (event.ws.kind == TARGET_WAITKIND_STOPPED | |
4896 | && event.ws.value.sig == GDB_SIGNAL_0) | |
4897 | { | |
4898 | /* We caught the event that we intended to catch, so | |
4899 | there's no event pending. */ | |
4900 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4901 | t->suspend.waitstatus_pending_p = 0; | |
4902 | ||
4903 | if (displaced_step_finish (t, GDB_SIGNAL_0) | |
4904 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) | |
4905 | { | |
4906 | /* Add it back to the step-over queue. */ | |
4907 | infrun_debug_printf | |
4908 | ("displaced-step of %s canceled", | |
4909 | target_pid_to_str (t->ptid).c_str ()); | |
4910 | ||
4911 | t->control.trap_expected = 0; | |
8ff53139 PA |
4912 | if (!t->inf->detaching) |
4913 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
4914 | } |
4915 | } | |
4916 | else | |
4917 | { | |
4918 | enum gdb_signal sig; | |
4919 | struct regcache *regcache; | |
4920 | ||
4921 | infrun_debug_printf | |
4922 | ("target_wait %s, saving status for %d.%ld.%ld", | |
4923 | target_waitstatus_to_string (&event.ws).c_str (), | |
4924 | t->ptid.pid (), t->ptid.lwp (), t->ptid.tid ()); | |
4925 | ||
4926 | /* Record for later. */ | |
4927 | save_waitstatus (t, &event.ws); | |
4928 | ||
4929 | sig = (event.ws.kind == TARGET_WAITKIND_STOPPED | |
4930 | ? event.ws.value.sig : GDB_SIGNAL_0); | |
4931 | ||
4932 | if (displaced_step_finish (t, sig) | |
4933 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) | |
4934 | { | |
4935 | /* Add it back to the step-over queue. */ | |
4936 | t->control.trap_expected = 0; | |
8ff53139 PA |
4937 | if (!t->inf->detaching) |
4938 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
4939 | } |
4940 | ||
4941 | regcache = get_thread_regcache (t); | |
4942 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4943 | ||
4944 | infrun_debug_printf ("saved stop_pc=%s for %s " | |
4945 | "(currently_stepping=%d)", | |
4946 | paddress (target_gdbarch (), | |
4947 | t->suspend.stop_pc), | |
4948 | target_pid_to_str (t->ptid).c_str (), | |
4949 | currently_stepping (t)); | |
4950 | } | |
4951 | } | |
4952 | ||
4953 | return false; | |
4954 | } | |
4955 | ||
6efcd9a8 | 4956 | /* See infrun.h. */ |
372316f1 | 4957 | |
6efcd9a8 | 4958 | void |
372316f1 PA |
4959 | stop_all_threads (void) |
4960 | { | |
4961 | /* We may need multiple passes to discover all threads. */ | |
4962 | int pass; | |
4963 | int iterations = 0; | |
372316f1 | 4964 | |
53cccef1 | 4965 | gdb_assert (exists_non_stop_target ()); |
372316f1 | 4966 | |
1eb8556f | 4967 | infrun_debug_printf ("starting"); |
372316f1 | 4968 | |
00431a78 | 4969 | scoped_restore_current_thread restore_thread; |
372316f1 | 4970 | |
6ad82919 TBA |
4971 | /* Enable thread events of all targets. */ |
4972 | for (auto *target : all_non_exited_process_targets ()) | |
4973 | { | |
4974 | switch_to_target_no_thread (target); | |
4975 | target_thread_events (true); | |
4976 | } | |
4977 | ||
4978 | SCOPE_EXIT | |
4979 | { | |
4980 | /* Disable thread events of all targets. */ | |
4981 | for (auto *target : all_non_exited_process_targets ()) | |
4982 | { | |
4983 | switch_to_target_no_thread (target); | |
4984 | target_thread_events (false); | |
4985 | } | |
4986 | ||
17417fb0 | 4987 | /* Use debug_prefixed_printf directly to get a meaningful function |
dda83cd7 | 4988 | name. */ |
6ad82919 | 4989 | if (debug_infrun) |
17417fb0 | 4990 | debug_prefixed_printf ("infrun", "stop_all_threads", "done"); |
6ad82919 | 4991 | }; |
65706a29 | 4992 | |
372316f1 PA |
4993 | /* Request threads to stop, and then wait for the stops. Because |
4994 | threads we already know about can spawn more threads while we're | |
4995 | trying to stop them, and we only learn about new threads when we | |
4996 | update the thread list, do this in a loop, and keep iterating | |
4997 | until two passes find no threads that need to be stopped. */ | |
4998 | for (pass = 0; pass < 2; pass++, iterations++) | |
4999 | { | |
1eb8556f | 5000 | infrun_debug_printf ("pass=%d, iterations=%d", pass, iterations); |
372316f1 PA |
5001 | while (1) |
5002 | { | |
29d6859f | 5003 | int waits_needed = 0; |
372316f1 | 5004 | |
a05575d3 TBA |
5005 | for (auto *target : all_non_exited_process_targets ()) |
5006 | { | |
5007 | switch_to_target_no_thread (target); | |
5008 | update_thread_list (); | |
5009 | } | |
372316f1 PA |
5010 | |
5011 | /* Go through all threads looking for threads that we need | |
5012 | to tell the target to stop. */ | |
08036331 | 5013 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 5014 | { |
53cccef1 TBA |
5015 | /* For a single-target setting with an all-stop target, |
5016 | we would not even arrive here. For a multi-target | |
5017 | setting, until GDB is able to handle a mixture of | |
5018 | all-stop and non-stop targets, simply skip all-stop | |
5019 | targets' threads. This should be fine due to the | |
5020 | protection of 'check_multi_target_resumption'. */ | |
5021 | ||
5022 | switch_to_thread_no_regs (t); | |
5023 | if (!target_is_non_stop_p ()) | |
5024 | continue; | |
5025 | ||
372316f1 PA |
5026 | if (t->executing) |
5027 | { | |
5028 | /* If already stopping, don't request a stop again. | |
5029 | We just haven't seen the notification yet. */ | |
5030 | if (!t->stop_requested) | |
5031 | { | |
1eb8556f SM |
5032 | infrun_debug_printf (" %s executing, need stop", |
5033 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
5034 | target_stop (t->ptid); |
5035 | t->stop_requested = 1; | |
5036 | } | |
5037 | else | |
5038 | { | |
1eb8556f SM |
5039 | infrun_debug_printf (" %s executing, already stopping", |
5040 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
5041 | } |
5042 | ||
5043 | if (t->stop_requested) | |
29d6859f | 5044 | waits_needed++; |
372316f1 PA |
5045 | } |
5046 | else | |
5047 | { | |
1eb8556f SM |
5048 | infrun_debug_printf (" %s not executing", |
5049 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
5050 | |
5051 | /* The thread may be not executing, but still be | |
5052 | resumed with a pending status to process. */ | |
719546c4 | 5053 | t->resumed = false; |
372316f1 PA |
5054 | } |
5055 | } | |
5056 | ||
29d6859f | 5057 | if (waits_needed == 0) |
372316f1 PA |
5058 | break; |
5059 | ||
5060 | /* If we find new threads on the second iteration, restart | |
5061 | over. We want to see two iterations in a row with all | |
5062 | threads stopped. */ | |
5063 | if (pass > 0) | |
5064 | pass = -1; | |
5065 | ||
29d6859f | 5066 | for (int i = 0; i < waits_needed; i++) |
c29705b7 | 5067 | { |
29d6859f | 5068 | wait_one_event event = wait_one (); |
d758e62c PA |
5069 | if (handle_one (event)) |
5070 | break; | |
372316f1 PA |
5071 | } |
5072 | } | |
5073 | } | |
372316f1 PA |
5074 | } |
5075 | ||
f4836ba9 PA |
5076 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
5077 | ||
c4464ade | 5078 | static bool |
f4836ba9 PA |
5079 | handle_no_resumed (struct execution_control_state *ecs) |
5080 | { | |
3b12939d | 5081 | if (target_can_async_p ()) |
f4836ba9 | 5082 | { |
c4464ade | 5083 | bool any_sync = false; |
f4836ba9 | 5084 | |
2dab0c7b | 5085 | for (ui *ui : all_uis ()) |
3b12939d PA |
5086 | { |
5087 | if (ui->prompt_state == PROMPT_BLOCKED) | |
5088 | { | |
c4464ade | 5089 | any_sync = true; |
3b12939d PA |
5090 | break; |
5091 | } | |
5092 | } | |
5093 | if (!any_sync) | |
5094 | { | |
5095 | /* There were no unwaited-for children left in the target, but, | |
5096 | we're not synchronously waiting for events either. Just | |
5097 | ignore. */ | |
5098 | ||
1eb8556f | 5099 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)"); |
3b12939d | 5100 | prepare_to_wait (ecs); |
c4464ade | 5101 | return true; |
3b12939d | 5102 | } |
f4836ba9 PA |
5103 | } |
5104 | ||
5105 | /* Otherwise, if we were running a synchronous execution command, we | |
5106 | may need to cancel it and give the user back the terminal. | |
5107 | ||
5108 | In non-stop mode, the target can't tell whether we've already | |
5109 | consumed previous stop events, so it can end up sending us a | |
5110 | no-resumed event like so: | |
5111 | ||
5112 | #0 - thread 1 is left stopped | |
5113 | ||
5114 | #1 - thread 2 is resumed and hits breakpoint | |
dda83cd7 | 5115 | -> TARGET_WAITKIND_STOPPED |
f4836ba9 PA |
5116 | |
5117 | #2 - thread 3 is resumed and exits | |
dda83cd7 | 5118 | this is the last resumed thread, so |
f4836ba9 PA |
5119 | -> TARGET_WAITKIND_NO_RESUMED |
5120 | ||
5121 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
dda83cd7 | 5122 | it. |
f4836ba9 PA |
5123 | |
5124 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
dda83cd7 | 5125 | thread 2 is now resumed, so the event should be ignored. |
f4836ba9 PA |
5126 | |
5127 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
5128 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
5129 | event. But it could be that the event meant that thread 2 itself | |
5130 | (or whatever other thread was the last resumed thread) exited. | |
5131 | ||
5132 | To address this we refresh the thread list and check whether we | |
5133 | have resumed threads _now_. In the example above, this removes | |
5134 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
5135 | ignore this event. If we find no thread resumed, then we cancel | |
7d3badc6 PA |
5136 | the synchronous command and show "no unwaited-for " to the |
5137 | user. */ | |
f4836ba9 | 5138 | |
d6cc5d98 | 5139 | inferior *curr_inf = current_inferior (); |
7d3badc6 | 5140 | |
d6cc5d98 PA |
5141 | scoped_restore_current_thread restore_thread; |
5142 | ||
5143 | for (auto *target : all_non_exited_process_targets ()) | |
5144 | { | |
5145 | switch_to_target_no_thread (target); | |
5146 | update_thread_list (); | |
5147 | } | |
5148 | ||
5149 | /* If: | |
5150 | ||
5151 | - the current target has no thread executing, and | |
5152 | - the current inferior is native, and | |
5153 | - the current inferior is the one which has the terminal, and | |
5154 | - we did nothing, | |
5155 | ||
5156 | then a Ctrl-C from this point on would remain stuck in the | |
5157 | kernel, until a thread resumes and dequeues it. That would | |
5158 | result in the GDB CLI not reacting to Ctrl-C, not able to | |
5159 | interrupt the program. To address this, if the current inferior | |
5160 | no longer has any thread executing, we give the terminal to some | |
5161 | other inferior that has at least one thread executing. */ | |
5162 | bool swap_terminal = true; | |
5163 | ||
5164 | /* Whether to ignore this TARGET_WAITKIND_NO_RESUMED event, or | |
5165 | whether to report it to the user. */ | |
5166 | bool ignore_event = false; | |
7d3badc6 PA |
5167 | |
5168 | for (thread_info *thread : all_non_exited_threads ()) | |
f4836ba9 | 5169 | { |
d6cc5d98 PA |
5170 | if (swap_terminal && thread->executing) |
5171 | { | |
5172 | if (thread->inf != curr_inf) | |
5173 | { | |
5174 | target_terminal::ours (); | |
5175 | ||
5176 | switch_to_thread (thread); | |
5177 | target_terminal::inferior (); | |
5178 | } | |
5179 | swap_terminal = false; | |
5180 | } | |
5181 | ||
5182 | if (!ignore_event | |
5183 | && (thread->executing | |
5184 | || thread->suspend.waitstatus_pending_p)) | |
f4836ba9 | 5185 | { |
7d3badc6 PA |
5186 | /* Either there were no unwaited-for children left in the |
5187 | target at some point, but there are now, or some target | |
5188 | other than the eventing one has unwaited-for children | |
5189 | left. Just ignore. */ | |
1eb8556f SM |
5190 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED " |
5191 | "(ignoring: found resumed)"); | |
d6cc5d98 PA |
5192 | |
5193 | ignore_event = true; | |
f4836ba9 | 5194 | } |
d6cc5d98 PA |
5195 | |
5196 | if (ignore_event && !swap_terminal) | |
5197 | break; | |
5198 | } | |
5199 | ||
5200 | if (ignore_event) | |
5201 | { | |
5202 | switch_to_inferior_no_thread (curr_inf); | |
5203 | prepare_to_wait (ecs); | |
c4464ade | 5204 | return true; |
f4836ba9 PA |
5205 | } |
5206 | ||
5207 | /* Go ahead and report the event. */ | |
c4464ade | 5208 | return false; |
f4836ba9 PA |
5209 | } |
5210 | ||
05ba8510 PA |
5211 | /* Given an execution control state that has been freshly filled in by |
5212 | an event from the inferior, figure out what it means and take | |
5213 | appropriate action. | |
5214 | ||
5215 | The alternatives are: | |
5216 | ||
22bcd14b | 5217 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5218 | debugger. |
5219 | ||
5220 | 2) keep_going and return; to wait for the next event (set | |
5221 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5222 | once). */ | |
c906108c | 5223 | |
ec9499be | 5224 | static void |
595915c1 | 5225 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5226 | { |
595915c1 TT |
5227 | /* Make sure that all temporary struct value objects that were |
5228 | created during the handling of the event get deleted at the | |
5229 | end. */ | |
5230 | scoped_value_mark free_values; | |
5231 | ||
1eb8556f | 5232 | infrun_debug_printf ("%s", target_waitstatus_to_string (&ecs->ws).c_str ()); |
c29705b7 | 5233 | |
28736962 PA |
5234 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
5235 | { | |
5236 | /* We had an event in the inferior, but we are not interested in | |
5237 | handling it at this level. The lower layers have already | |
5238 | done what needs to be done, if anything. | |
5239 | ||
5240 | One of the possible circumstances for this is when the | |
5241 | inferior produces output for the console. The inferior has | |
5242 | not stopped, and we are ignoring the event. Another possible | |
5243 | circumstance is any event which the lower level knows will be | |
5244 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5245 | prepare_to_wait (ecs); |
5246 | return; | |
5247 | } | |
5248 | ||
65706a29 PA |
5249 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
5250 | { | |
65706a29 PA |
5251 | prepare_to_wait (ecs); |
5252 | return; | |
5253 | } | |
5254 | ||
0e5bf2a8 | 5255 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5256 | && handle_no_resumed (ecs)) |
5257 | return; | |
0e5bf2a8 | 5258 | |
5b6d1e4f PA |
5259 | /* Cache the last target/ptid/waitstatus. */ |
5260 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5261 | |
ca005067 | 5262 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5263 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5264 | |
0e5bf2a8 PA |
5265 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
5266 | { | |
5267 | /* No unwaited-for children left. IOW, all resumed children | |
5268 | have exited. */ | |
c4464ade | 5269 | stop_print_frame = false; |
22bcd14b | 5270 | stop_waiting (ecs); |
0e5bf2a8 PA |
5271 | return; |
5272 | } | |
5273 | ||
8c90c137 | 5274 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 5275 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 | 5276 | { |
5b6d1e4f | 5277 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5278 | /* If it's a new thread, add it to the thread database. */ |
5279 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5280 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5281 | |
5282 | /* Disable range stepping. If the next step request could use a | |
5283 | range, this will be end up re-enabled then. */ | |
5284 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5285 | } |
88ed393a JK |
5286 | |
5287 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 5288 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
5289 | |
5290 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5291 | reinit_frame_cache (); | |
5292 | ||
28736962 PA |
5293 | breakpoint_retire_moribund (); |
5294 | ||
2b009048 DJ |
5295 | /* First, distinguish signals caused by the debugger from signals |
5296 | that have to do with the program's own actions. Note that | |
5297 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5298 | on the operating system version. Here we detect when a SIGILL or | |
5299 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5300 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5301 | when we're trying to execute a breakpoint instruction on a | |
5302 | non-executable stack. This happens for call dummy breakpoints | |
5303 | for architectures like SPARC that place call dummies on the | |
5304 | stack. */ | |
2b009048 | 5305 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
5306 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
5307 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
5308 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 5309 | { |
00431a78 | 5310 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5311 | |
a01bda52 | 5312 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5313 | regcache_read_pc (regcache))) |
5314 | { | |
1eb8556f | 5315 | infrun_debug_printf ("Treating signal as SIGTRAP"); |
a493e3e2 | 5316 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 5317 | } |
2b009048 DJ |
5318 | } |
5319 | ||
293b3ebc | 5320 | mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws); |
8c90c137 | 5321 | |
488f131b JB |
5322 | switch (ecs->ws.kind) |
5323 | { | |
5324 | case TARGET_WAITKIND_LOADED: | |
72d383bb SM |
5325 | { |
5326 | context_switch (ecs); | |
5327 | /* Ignore gracefully during startup of the inferior, as it might | |
5328 | be the shell which has just loaded some objects, otherwise | |
5329 | add the symbols for the newly loaded objects. Also ignore at | |
5330 | the beginning of an attach or remote session; we will query | |
5331 | the full list of libraries once the connection is | |
5332 | established. */ | |
5333 | ||
5334 | stop_kind stop_soon = get_inferior_stop_soon (ecs); | |
5335 | if (stop_soon == NO_STOP_QUIETLY) | |
5336 | { | |
5337 | struct regcache *regcache; | |
edcc5120 | 5338 | |
72d383bb | 5339 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 | 5340 | |
72d383bb | 5341 | handle_solib_event (); |
ab04a2af | 5342 | |
72d383bb SM |
5343 | ecs->event_thread->control.stop_bpstat |
5344 | = bpstat_stop_status (regcache->aspace (), | |
5345 | ecs->event_thread->suspend.stop_pc, | |
5346 | ecs->event_thread, &ecs->ws); | |
c65d6b55 | 5347 | |
72d383bb | 5348 | if (handle_stop_requested (ecs)) |
94c57d6a | 5349 | return; |
488f131b | 5350 | |
72d383bb SM |
5351 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
5352 | { | |
5353 | /* A catchpoint triggered. */ | |
5354 | process_event_stop_test (ecs); | |
5355 | return; | |
5356 | } | |
55409f9d | 5357 | |
72d383bb SM |
5358 | /* If requested, stop when the dynamic linker notifies |
5359 | gdb of events. This allows the user to get control | |
5360 | and place breakpoints in initializer routines for | |
5361 | dynamically loaded objects (among other things). */ | |
5362 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
5363 | if (stop_on_solib_events) | |
5364 | { | |
5365 | /* Make sure we print "Stopped due to solib-event" in | |
5366 | normal_stop. */ | |
5367 | stop_print_frame = true; | |
b0f4b84b | 5368 | |
72d383bb SM |
5369 | stop_waiting (ecs); |
5370 | return; | |
5371 | } | |
5372 | } | |
b0f4b84b | 5373 | |
72d383bb SM |
5374 | /* If we are skipping through a shell, or through shared library |
5375 | loading that we aren't interested in, resume the program. If | |
5376 | we're running the program normally, also resume. */ | |
5377 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
5378 | { | |
5379 | /* Loading of shared libraries might have changed breakpoint | |
5380 | addresses. Make sure new breakpoints are inserted. */ | |
5381 | if (stop_soon == NO_STOP_QUIETLY) | |
5382 | insert_breakpoints (); | |
5383 | resume (GDB_SIGNAL_0); | |
5384 | prepare_to_wait (ecs); | |
5385 | return; | |
5386 | } | |
5c09a2c5 | 5387 | |
72d383bb SM |
5388 | /* But stop if we're attaching or setting up a remote |
5389 | connection. */ | |
5390 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5391 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5392 | { | |
5393 | infrun_debug_printf ("quietly stopped"); | |
5394 | stop_waiting (ecs); | |
5395 | return; | |
5396 | } | |
5397 | ||
5398 | internal_error (__FILE__, __LINE__, | |
5399 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
5400 | } | |
c5aa993b | 5401 | |
488f131b | 5402 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5403 | if (handle_stop_requested (ecs)) |
5404 | return; | |
00431a78 | 5405 | context_switch (ecs); |
64ce06e4 | 5406 | resume (GDB_SIGNAL_0); |
488f131b JB |
5407 | prepare_to_wait (ecs); |
5408 | return; | |
c5aa993b | 5409 | |
65706a29 | 5410 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5411 | if (handle_stop_requested (ecs)) |
5412 | return; | |
00431a78 | 5413 | context_switch (ecs); |
65706a29 PA |
5414 | if (!switch_back_to_stepped_thread (ecs)) |
5415 | keep_going (ecs); | |
5416 | return; | |
5417 | ||
488f131b | 5418 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5419 | case TARGET_WAITKIND_SIGNALLED: |
18493a00 PA |
5420 | { |
5421 | /* Depending on the system, ecs->ptid may point to a thread or | |
5422 | to a process. On some targets, target_mourn_inferior may | |
5423 | need to have access to the just-exited thread. That is the | |
5424 | case of GNU/Linux's "checkpoint" support, for example. | |
5425 | Call the switch_to_xxx routine as appropriate. */ | |
5426 | thread_info *thr = find_thread_ptid (ecs->target, ecs->ptid); | |
5427 | if (thr != nullptr) | |
5428 | switch_to_thread (thr); | |
5429 | else | |
5430 | { | |
5431 | inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); | |
5432 | switch_to_inferior_no_thread (inf); | |
5433 | } | |
5434 | } | |
6c95b8df | 5435 | handle_vfork_child_exec_or_exit (0); |
223ffa71 | 5436 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5437 | |
0c557179 SDJ |
5438 | /* Clearing any previous state of convenience variables. */ |
5439 | clear_exit_convenience_vars (); | |
5440 | ||
940c3c06 PA |
5441 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5442 | { | |
5443 | /* Record the exit code in the convenience variable $_exitcode, so | |
5444 | that the user can inspect this again later. */ | |
5445 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5446 | (LONGEST) ecs->ws.value.integer); | |
5447 | ||
5448 | /* Also record this in the inferior itself. */ | |
5449 | current_inferior ()->has_exit_code = 1; | |
5450 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5451 | |
98eb56a4 PA |
5452 | /* Support the --return-child-result option. */ |
5453 | return_child_result_value = ecs->ws.value.integer; | |
5454 | ||
76727919 | 5455 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
5456 | } |
5457 | else | |
0c557179 | 5458 | { |
00431a78 | 5459 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5460 | |
5461 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5462 | { | |
5463 | /* Set the value of the internal variable $_exitsignal, | |
5464 | which holds the signal uncaught by the inferior. */ | |
5465 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5466 | gdbarch_gdb_signal_to_target (gdbarch, | |
5467 | ecs->ws.value.sig)); | |
5468 | } | |
5469 | else | |
5470 | { | |
5471 | /* We don't have access to the target's method used for | |
5472 | converting between signal numbers (GDB's internal | |
5473 | representation <-> target's representation). | |
5474 | Therefore, we cannot do a good job at displaying this | |
5475 | information to the user. It's better to just warn | |
5476 | her about it (if infrun debugging is enabled), and | |
5477 | give up. */ | |
1eb8556f SM |
5478 | infrun_debug_printf ("Cannot fill $_exitsignal with the correct " |
5479 | "signal number."); | |
0c557179 SDJ |
5480 | } |
5481 | ||
76727919 | 5482 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 5483 | } |
8cf64490 | 5484 | |
488f131b | 5485 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5486 | target_mourn_inferior (inferior_ptid); |
c4464ade | 5487 | stop_print_frame = false; |
22bcd14b | 5488 | stop_waiting (ecs); |
488f131b | 5489 | return; |
c5aa993b | 5490 | |
488f131b | 5491 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5492 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5493 | /* Check whether the inferior is displaced stepping. */ |
5494 | { | |
00431a78 | 5495 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5496 | struct gdbarch *gdbarch = regcache->arch (); |
c0aba012 | 5497 | inferior *parent_inf = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 | 5498 | |
aeeb758d JB |
5499 | /* If this is a fork (child gets its own address space copy) |
5500 | and some displaced step buffers were in use at the time of | |
5501 | the fork, restore the displaced step buffer bytes in the | |
5502 | child process. | |
5503 | ||
5504 | Architectures which support displaced stepping and fork | |
5505 | events must supply an implementation of | |
5506 | gdbarch_displaced_step_restore_all_in_ptid. This is not | |
5507 | enforced during gdbarch validation to support architectures | |
5508 | which support displaced stepping but not forks. */ | |
5509 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED | |
5510 | && gdbarch_supports_displaced_stepping (gdbarch)) | |
187b041e SM |
5511 | gdbarch_displaced_step_restore_all_in_ptid |
5512 | (gdbarch, parent_inf, ecs->ws.value.related_pid); | |
c0aba012 SM |
5513 | |
5514 | /* If displaced stepping is supported, and thread ecs->ptid is | |
5515 | displaced stepping. */ | |
00431a78 | 5516 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 | 5517 | { |
e2d96639 YQ |
5518 | struct regcache *child_regcache; |
5519 | CORE_ADDR parent_pc; | |
5520 | ||
5521 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
5522 | indicating that the displaced stepping of syscall instruction | |
5523 | has been done. Perform cleanup for parent process here. Note | |
5524 | that this operation also cleans up the child process for vfork, | |
5525 | because their pages are shared. */ | |
7def77a1 | 5526 | displaced_step_finish (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5527 | /* Start a new step-over in another thread if there's one |
5528 | that needs it. */ | |
5529 | start_step_over (); | |
e2d96639 | 5530 | |
e2d96639 YQ |
5531 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5532 | the child's PC is also within the scratchpad. Set the child's PC | |
5533 | to the parent's PC value, which has already been fixed up. | |
5534 | FIXME: we use the parent's aspace here, although we're touching | |
5535 | the child, because the child hasn't been added to the inferior | |
5536 | list yet at this point. */ | |
5537 | ||
5538 | child_regcache | |
5b6d1e4f PA |
5539 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
5540 | ecs->ws.value.related_pid, | |
e2d96639 YQ |
5541 | gdbarch, |
5542 | parent_inf->aspace); | |
5543 | /* Read PC value of parent process. */ | |
5544 | parent_pc = regcache_read_pc (regcache); | |
5545 | ||
136821d9 SM |
5546 | displaced_debug_printf ("write child pc from %s to %s", |
5547 | paddress (gdbarch, | |
5548 | regcache_read_pc (child_regcache)), | |
5549 | paddress (gdbarch, parent_pc)); | |
e2d96639 YQ |
5550 | |
5551 | regcache_write_pc (child_regcache, parent_pc); | |
5552 | } | |
5553 | } | |
5554 | ||
00431a78 | 5555 | context_switch (ecs); |
5a2901d9 | 5556 | |
b242c3c2 PA |
5557 | /* Immediately detach breakpoints from the child before there's |
5558 | any chance of letting the user delete breakpoints from the | |
5559 | breakpoint lists. If we don't do this early, it's easy to | |
5560 | leave left over traps in the child, vis: "break foo; catch | |
5561 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5562 | the fork on the last `continue', and by that time the | |
5563 | breakpoint at "foo" is long gone from the breakpoint table. | |
5564 | If we vforked, then we don't need to unpatch here, since both | |
5565 | parent and child are sharing the same memory pages; we'll | |
5566 | need to unpatch at follow/detach time instead to be certain | |
5567 | that new breakpoints added between catchpoint hit time and | |
5568 | vfork follow are detached. */ | |
5569 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5570 | { | |
b242c3c2 PA |
5571 | /* This won't actually modify the breakpoint list, but will |
5572 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5573 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5574 | } |
5575 | ||
34b7e8a6 | 5576 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5577 | |
e58b0e63 PA |
5578 | /* In case the event is caught by a catchpoint, remember that |
5579 | the event is to be followed at the next resume of the thread, | |
5580 | and not immediately. */ | |
5581 | ecs->event_thread->pending_follow = ecs->ws; | |
5582 | ||
f2ffa92b PA |
5583 | ecs->event_thread->suspend.stop_pc |
5584 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 5585 | |
16c381f0 | 5586 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5587 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5588 | ecs->event_thread->suspend.stop_pc, |
5589 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 5590 | |
c65d6b55 PA |
5591 | if (handle_stop_requested (ecs)) |
5592 | return; | |
5593 | ||
ce12b012 PA |
5594 | /* If no catchpoint triggered for this, then keep going. Note |
5595 | that we're interested in knowing the bpstat actually causes a | |
5596 | stop, not just if it may explain the signal. Software | |
5597 | watchpoints, for example, always appear in the bpstat. */ | |
5598 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5599 | { |
5ab2fbf1 | 5600 | bool follow_child |
3e43a32a | 5601 | = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 5602 | |
a493e3e2 | 5603 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 | 5604 | |
5b6d1e4f PA |
5605 | process_stratum_target *targ |
5606 | = ecs->event_thread->inf->process_target (); | |
5607 | ||
5ab2fbf1 | 5608 | bool should_resume = follow_fork (); |
e58b0e63 | 5609 | |
5b6d1e4f PA |
5610 | /* Note that one of these may be an invalid pointer, |
5611 | depending on detach_fork. */ | |
00431a78 | 5612 | thread_info *parent = ecs->event_thread; |
5b6d1e4f PA |
5613 | thread_info *child |
5614 | = find_thread_ptid (targ, ecs->ws.value.related_pid); | |
6c95b8df | 5615 | |
a2077e25 PA |
5616 | /* At this point, the parent is marked running, and the |
5617 | child is marked stopped. */ | |
5618 | ||
5619 | /* If not resuming the parent, mark it stopped. */ | |
5620 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5621 | parent->set_running (false); |
a2077e25 PA |
5622 | |
5623 | /* If resuming the child, mark it running. */ | |
5624 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5625 | child->set_running (true); |
a2077e25 | 5626 | |
6c95b8df | 5627 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5628 | if (!detach_fork && (non_stop |
5629 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5630 | { |
5631 | if (follow_child) | |
5632 | switch_to_thread (parent); | |
5633 | else | |
5634 | switch_to_thread (child); | |
5635 | ||
5636 | ecs->event_thread = inferior_thread (); | |
5637 | ecs->ptid = inferior_ptid; | |
5638 | keep_going (ecs); | |
5639 | } | |
5640 | ||
5641 | if (follow_child) | |
5642 | switch_to_thread (child); | |
5643 | else | |
5644 | switch_to_thread (parent); | |
5645 | ||
e58b0e63 PA |
5646 | ecs->event_thread = inferior_thread (); |
5647 | ecs->ptid = inferior_ptid; | |
5648 | ||
5649 | if (should_resume) | |
5650 | keep_going (ecs); | |
5651 | else | |
22bcd14b | 5652 | stop_waiting (ecs); |
04e68871 DJ |
5653 | return; |
5654 | } | |
94c57d6a PA |
5655 | process_event_stop_test (ecs); |
5656 | return; | |
488f131b | 5657 | |
6c95b8df PA |
5658 | case TARGET_WAITKIND_VFORK_DONE: |
5659 | /* Done with the shared memory region. Re-insert breakpoints in | |
5660 | the parent, and keep going. */ | |
5661 | ||
00431a78 | 5662 | context_switch (ecs); |
6c95b8df PA |
5663 | |
5664 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5665 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5666 | |
5667 | if (handle_stop_requested (ecs)) | |
5668 | return; | |
5669 | ||
6c95b8df PA |
5670 | /* This also takes care of reinserting breakpoints in the |
5671 | previously locked inferior. */ | |
5672 | keep_going (ecs); | |
5673 | return; | |
5674 | ||
488f131b | 5675 | case TARGET_WAITKIND_EXECD: |
488f131b | 5676 | |
cbd2b4e3 PA |
5677 | /* Note we can't read registers yet (the stop_pc), because we |
5678 | don't yet know the inferior's post-exec architecture. | |
5679 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5680 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5681 | |
6c95b8df PA |
5682 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5683 | handle_vfork_child_exec_or_exit (1); | |
5684 | ||
795e548f | 5685 | /* This causes the eventpoints and symbol table to be reset. |
dda83cd7 SM |
5686 | Must do this now, before trying to determine whether to |
5687 | stop. */ | |
71b43ef8 | 5688 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5689 | |
17d8546e DB |
5690 | /* In follow_exec we may have deleted the original thread and |
5691 | created a new one. Make sure that the event thread is the | |
5692 | execd thread for that case (this is a nop otherwise). */ | |
5693 | ecs->event_thread = inferior_thread (); | |
5694 | ||
f2ffa92b PA |
5695 | ecs->event_thread->suspend.stop_pc |
5696 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5697 | |
16c381f0 | 5698 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5699 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5700 | ecs->event_thread->suspend.stop_pc, |
5701 | ecs->event_thread, &ecs->ws); | |
795e548f | 5702 | |
71b43ef8 PA |
5703 | /* Note that this may be referenced from inside |
5704 | bpstat_stop_status above, through inferior_has_execd. */ | |
5705 | xfree (ecs->ws.value.execd_pathname); | |
5706 | ecs->ws.value.execd_pathname = NULL; | |
5707 | ||
c65d6b55 PA |
5708 | if (handle_stop_requested (ecs)) |
5709 | return; | |
5710 | ||
04e68871 | 5711 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5712 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5713 | { |
a493e3e2 | 5714 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5715 | keep_going (ecs); |
5716 | return; | |
5717 | } | |
94c57d6a PA |
5718 | process_event_stop_test (ecs); |
5719 | return; | |
488f131b | 5720 | |
b4dc5ffa | 5721 | /* Be careful not to try to gather much state about a thread |
dda83cd7 | 5722 | that's in a syscall. It's frequently a losing proposition. */ |
488f131b | 5723 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5724 | /* Getting the current syscall number. */ |
94c57d6a PA |
5725 | if (handle_syscall_event (ecs) == 0) |
5726 | process_event_stop_test (ecs); | |
5727 | return; | |
c906108c | 5728 | |
488f131b | 5729 | /* Before examining the threads further, step this thread to |
dda83cd7 SM |
5730 | get it entirely out of the syscall. (We get notice of the |
5731 | event when the thread is just on the verge of exiting a | |
5732 | syscall. Stepping one instruction seems to get it back | |
5733 | into user code.) */ | |
488f131b | 5734 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5735 | if (handle_syscall_event (ecs) == 0) |
5736 | process_event_stop_test (ecs); | |
5737 | return; | |
c906108c | 5738 | |
488f131b | 5739 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5740 | handle_signal_stop (ecs); |
5741 | return; | |
c906108c | 5742 | |
b2175913 MS |
5743 | case TARGET_WAITKIND_NO_HISTORY: |
5744 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5745 | |
d1988021 | 5746 | /* Switch to the stopped thread. */ |
00431a78 | 5747 | context_switch (ecs); |
1eb8556f | 5748 | infrun_debug_printf ("stopped"); |
d1988021 | 5749 | |
34b7e8a6 | 5750 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5751 | ecs->event_thread->suspend.stop_pc |
5752 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5753 | |
5754 | if (handle_stop_requested (ecs)) | |
5755 | return; | |
5756 | ||
76727919 | 5757 | gdb::observers::no_history.notify (); |
22bcd14b | 5758 | stop_waiting (ecs); |
b2175913 | 5759 | return; |
488f131b | 5760 | } |
4f5d7f63 PA |
5761 | } |
5762 | ||
372316f1 PA |
5763 | /* Restart threads back to what they were trying to do back when we |
5764 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5765 | ignored. */ | |
4d9d9d04 PA |
5766 | |
5767 | static void | |
372316f1 PA |
5768 | restart_threads (struct thread_info *event_thread) |
5769 | { | |
372316f1 PA |
5770 | /* In case the instruction just stepped spawned a new thread. */ |
5771 | update_thread_list (); | |
5772 | ||
08036331 | 5773 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5774 | { |
ac7d717c PA |
5775 | if (tp->inf->detaching) |
5776 | { | |
5777 | infrun_debug_printf ("restart threads: [%s] inferior detaching", | |
5778 | target_pid_to_str (tp->ptid).c_str ()); | |
5779 | continue; | |
5780 | } | |
5781 | ||
f3f8ece4 PA |
5782 | switch_to_thread_no_regs (tp); |
5783 | ||
372316f1 PA |
5784 | if (tp == event_thread) |
5785 | { | |
1eb8556f SM |
5786 | infrun_debug_printf ("restart threads: [%s] is event thread", |
5787 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5788 | continue; |
5789 | } | |
5790 | ||
5791 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5792 | { | |
1eb8556f SM |
5793 | infrun_debug_printf ("restart threads: [%s] not meant to be running", |
5794 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5795 | continue; |
5796 | } | |
5797 | ||
5798 | if (tp->resumed) | |
5799 | { | |
1eb8556f SM |
5800 | infrun_debug_printf ("restart threads: [%s] resumed", |
5801 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5802 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
5803 | continue; | |
5804 | } | |
5805 | ||
5806 | if (thread_is_in_step_over_chain (tp)) | |
5807 | { | |
1eb8556f SM |
5808 | infrun_debug_printf ("restart threads: [%s] needs step-over", |
5809 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5810 | gdb_assert (!tp->resumed); |
5811 | continue; | |
5812 | } | |
5813 | ||
5814 | ||
5815 | if (tp->suspend.waitstatus_pending_p) | |
5816 | { | |
1eb8556f SM |
5817 | infrun_debug_printf ("restart threads: [%s] has pending status", |
5818 | target_pid_to_str (tp->ptid).c_str ()); | |
719546c4 | 5819 | tp->resumed = true; |
372316f1 PA |
5820 | continue; |
5821 | } | |
5822 | ||
c65d6b55 PA |
5823 | gdb_assert (!tp->stop_requested); |
5824 | ||
372316f1 PA |
5825 | /* If some thread needs to start a step-over at this point, it |
5826 | should still be in the step-over queue, and thus skipped | |
5827 | above. */ | |
5828 | if (thread_still_needs_step_over (tp)) | |
5829 | { | |
5830 | internal_error (__FILE__, __LINE__, | |
5831 | "thread [%s] needs a step-over, but not in " | |
5832 | "step-over queue\n", | |
a068643d | 5833 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5834 | } |
5835 | ||
5836 | if (currently_stepping (tp)) | |
5837 | { | |
1eb8556f SM |
5838 | infrun_debug_printf ("restart threads: [%s] was stepping", |
5839 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5840 | keep_going_stepped_thread (tp); |
5841 | } | |
5842 | else | |
5843 | { | |
5844 | struct execution_control_state ecss; | |
5845 | struct execution_control_state *ecs = &ecss; | |
5846 | ||
1eb8556f SM |
5847 | infrun_debug_printf ("restart threads: [%s] continuing", |
5848 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 5849 | reset_ecs (ecs, tp); |
00431a78 | 5850 | switch_to_thread (tp); |
372316f1 PA |
5851 | keep_going_pass_signal (ecs); |
5852 | } | |
5853 | } | |
5854 | } | |
5855 | ||
5856 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5857 | a pending waitstatus. */ | |
5858 | ||
5859 | static int | |
5860 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5861 | void *arg) | |
5862 | { | |
5863 | return (tp->resumed | |
5864 | && tp->suspend.waitstatus_pending_p); | |
5865 | } | |
5866 | ||
5867 | /* Called when we get an event that may finish an in-line or | |
5868 | out-of-line (displaced stepping) step-over started previously. | |
5869 | Return true if the event is processed and we should go back to the | |
5870 | event loop; false if the caller should continue processing the | |
5871 | event. */ | |
5872 | ||
5873 | static int | |
4d9d9d04 PA |
5874 | finish_step_over (struct execution_control_state *ecs) |
5875 | { | |
7def77a1 SM |
5876 | displaced_step_finish (ecs->event_thread, |
5877 | ecs->event_thread->suspend.stop_signal); | |
4d9d9d04 | 5878 | |
c4464ade | 5879 | bool had_step_over_info = step_over_info_valid_p (); |
372316f1 PA |
5880 | |
5881 | if (had_step_over_info) | |
4d9d9d04 PA |
5882 | { |
5883 | /* If we're stepping over a breakpoint with all threads locked, | |
5884 | then only the thread that was stepped should be reporting | |
5885 | back an event. */ | |
5886 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5887 | ||
c65d6b55 | 5888 | clear_step_over_info (); |
4d9d9d04 PA |
5889 | } |
5890 | ||
fbea99ea | 5891 | if (!target_is_non_stop_p ()) |
372316f1 | 5892 | return 0; |
4d9d9d04 PA |
5893 | |
5894 | /* Start a new step-over in another thread if there's one that | |
5895 | needs it. */ | |
5896 | start_step_over (); | |
372316f1 PA |
5897 | |
5898 | /* If we were stepping over a breakpoint before, and haven't started | |
5899 | a new in-line step-over sequence, then restart all other threads | |
5900 | (except the event thread). We can't do this in all-stop, as then | |
5901 | e.g., we wouldn't be able to issue any other remote packet until | |
5902 | these other threads stop. */ | |
5903 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5904 | { | |
5905 | struct thread_info *pending; | |
5906 | ||
5907 | /* If we only have threads with pending statuses, the restart | |
5908 | below won't restart any thread and so nothing re-inserts the | |
5909 | breakpoint we just stepped over. But we need it inserted | |
5910 | when we later process the pending events, otherwise if | |
5911 | another thread has a pending event for this breakpoint too, | |
5912 | we'd discard its event (because the breakpoint that | |
5913 | originally caused the event was no longer inserted). */ | |
00431a78 | 5914 | context_switch (ecs); |
372316f1 PA |
5915 | insert_breakpoints (); |
5916 | ||
5917 | restart_threads (ecs->event_thread); | |
5918 | ||
5919 | /* If we have events pending, go through handle_inferior_event | |
5920 | again, picking up a pending event at random. This avoids | |
5921 | thread starvation. */ | |
5922 | ||
5923 | /* But not if we just stepped over a watchpoint in order to let | |
5924 | the instruction execute so we can evaluate its expression. | |
5925 | The set of watchpoints that triggered is recorded in the | |
5926 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5927 | If we processed another event first, that other event could | |
5928 | clobber this info. */ | |
5929 | if (ecs->event_thread->stepping_over_watchpoint) | |
5930 | return 0; | |
5931 | ||
5932 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5933 | NULL); | |
5934 | if (pending != NULL) | |
5935 | { | |
5936 | struct thread_info *tp = ecs->event_thread; | |
5937 | struct regcache *regcache; | |
5938 | ||
1eb8556f SM |
5939 | infrun_debug_printf ("found resumed threads with " |
5940 | "pending events, saving status"); | |
372316f1 PA |
5941 | |
5942 | gdb_assert (pending != tp); | |
5943 | ||
5944 | /* Record the event thread's event for later. */ | |
5945 | save_waitstatus (tp, &ecs->ws); | |
5946 | /* This was cleared early, by handle_inferior_event. Set it | |
5947 | so this pending event is considered by | |
5948 | do_target_wait. */ | |
719546c4 | 5949 | tp->resumed = true; |
372316f1 PA |
5950 | |
5951 | gdb_assert (!tp->executing); | |
5952 | ||
00431a78 | 5953 | regcache = get_thread_regcache (tp); |
372316f1 PA |
5954 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
5955 | ||
1eb8556f SM |
5956 | infrun_debug_printf ("saved stop_pc=%s for %s " |
5957 | "(currently_stepping=%d)", | |
5958 | paddress (target_gdbarch (), | |
dda83cd7 | 5959 | tp->suspend.stop_pc), |
1eb8556f SM |
5960 | target_pid_to_str (tp->ptid).c_str (), |
5961 | currently_stepping (tp)); | |
372316f1 PA |
5962 | |
5963 | /* This in-line step-over finished; clear this so we won't | |
5964 | start a new one. This is what handle_signal_stop would | |
5965 | do, if we returned false. */ | |
5966 | tp->stepping_over_breakpoint = 0; | |
5967 | ||
5968 | /* Wake up the event loop again. */ | |
5969 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5970 | ||
5971 | prepare_to_wait (ecs); | |
5972 | return 1; | |
5973 | } | |
5974 | } | |
5975 | ||
5976 | return 0; | |
4d9d9d04 PA |
5977 | } |
5978 | ||
4f5d7f63 PA |
5979 | /* Come here when the program has stopped with a signal. */ |
5980 | ||
5981 | static void | |
5982 | handle_signal_stop (struct execution_control_state *ecs) | |
5983 | { | |
5984 | struct frame_info *frame; | |
5985 | struct gdbarch *gdbarch; | |
5986 | int stopped_by_watchpoint; | |
5987 | enum stop_kind stop_soon; | |
5988 | int random_signal; | |
c906108c | 5989 | |
f0407826 DE |
5990 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5991 | ||
c65d6b55 PA |
5992 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5993 | ||
f0407826 DE |
5994 | /* Do we need to clean up the state of a thread that has |
5995 | completed a displaced single-step? (Doing so usually affects | |
5996 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5997 | if (finish_step_over (ecs)) |
5998 | return; | |
f0407826 DE |
5999 | |
6000 | /* If we either finished a single-step or hit a breakpoint, but | |
6001 | the user wanted this thread to be stopped, pretend we got a | |
6002 | SIG0 (generic unsignaled stop). */ | |
6003 | if (ecs->event_thread->stop_requested | |
6004 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
6005 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 6006 | |
f2ffa92b PA |
6007 | ecs->event_thread->suspend.stop_pc |
6008 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 6009 | |
2ab76a18 PA |
6010 | context_switch (ecs); |
6011 | ||
6012 | if (deprecated_context_hook) | |
6013 | deprecated_context_hook (ecs->event_thread->global_num); | |
6014 | ||
527159b7 | 6015 | if (debug_infrun) |
237fc4c9 | 6016 | { |
00431a78 | 6017 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 6018 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 6019 | |
1eb8556f SM |
6020 | infrun_debug_printf ("stop_pc=%s", |
6021 | paddress (reg_gdbarch, | |
6022 | ecs->event_thread->suspend.stop_pc)); | |
d92524f1 | 6023 | if (target_stopped_by_watchpoint ()) |
237fc4c9 | 6024 | { |
dda83cd7 | 6025 | CORE_ADDR addr; |
abbb1732 | 6026 | |
1eb8556f | 6027 | infrun_debug_printf ("stopped by watchpoint"); |
237fc4c9 | 6028 | |
328d42d8 SM |
6029 | if (target_stopped_data_address (current_inferior ()->top_target (), |
6030 | &addr)) | |
1eb8556f | 6031 | infrun_debug_printf ("stopped data address=%s", |
dda83cd7 SM |
6032 | paddress (reg_gdbarch, addr)); |
6033 | else | |
1eb8556f | 6034 | infrun_debug_printf ("(no data address available)"); |
237fc4c9 PA |
6035 | } |
6036 | } | |
527159b7 | 6037 | |
36fa8042 PA |
6038 | /* This is originated from start_remote(), start_inferior() and |
6039 | shared libraries hook functions. */ | |
00431a78 | 6040 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
6041 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
6042 | { | |
1eb8556f | 6043 | infrun_debug_printf ("quietly stopped"); |
c4464ade | 6044 | stop_print_frame = true; |
22bcd14b | 6045 | stop_waiting (ecs); |
36fa8042 PA |
6046 | return; |
6047 | } | |
6048 | ||
36fa8042 PA |
6049 | /* This originates from attach_command(). We need to overwrite |
6050 | the stop_signal here, because some kernels don't ignore a | |
6051 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
6052 | See more comments in inferior.h. On the other hand, if we | |
6053 | get a non-SIGSTOP, report it to the user - assume the backend | |
6054 | will handle the SIGSTOP if it should show up later. | |
6055 | ||
6056 | Also consider that the attach is complete when we see a | |
6057 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
6058 | target extended-remote report it instead of a SIGSTOP | |
6059 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
6060 | signal, so this is no exception. | |
6061 | ||
6062 | Also consider that the attach is complete when we see a | |
6063 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
6064 | the target to stop all threads of the inferior, in case the | |
6065 | low level attach operation doesn't stop them implicitly. If | |
6066 | they weren't stopped implicitly, then the stub will report a | |
6067 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
6068 | other than GDB's request. */ | |
6069 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
6070 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
6071 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6072 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
6073 | { | |
c4464ade | 6074 | stop_print_frame = true; |
22bcd14b | 6075 | stop_waiting (ecs); |
36fa8042 PA |
6076 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
6077 | return; | |
6078 | } | |
6079 | ||
568d6575 UW |
6080 | /* At this point, get hold of the now-current thread's frame. */ |
6081 | frame = get_current_frame (); | |
6082 | gdbarch = get_frame_arch (frame); | |
6083 | ||
2adfaa28 | 6084 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 6085 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 6086 | { |
af48d08f | 6087 | struct regcache *regcache; |
af48d08f | 6088 | CORE_ADDR pc; |
2adfaa28 | 6089 | |
00431a78 | 6090 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
6091 | const address_space *aspace = regcache->aspace (); |
6092 | ||
af48d08f | 6093 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 6094 | |
af48d08f PA |
6095 | /* However, before doing so, if this single-step breakpoint was |
6096 | actually for another thread, set this thread up for moving | |
6097 | past it. */ | |
6098 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
6099 | aspace, pc)) | |
6100 | { | |
6101 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 | 6102 | { |
1eb8556f SM |
6103 | infrun_debug_printf ("[%s] hit another thread's single-step " |
6104 | "breakpoint", | |
6105 | target_pid_to_str (ecs->ptid).c_str ()); | |
af48d08f PA |
6106 | ecs->hit_singlestep_breakpoint = 1; |
6107 | } | |
6108 | } | |
6109 | else | |
6110 | { | |
1eb8556f SM |
6111 | infrun_debug_printf ("[%s] hit its single-step breakpoint", |
6112 | target_pid_to_str (ecs->ptid).c_str ()); | |
2adfaa28 | 6113 | } |
488f131b | 6114 | } |
af48d08f | 6115 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 6116 | |
963f9c80 PA |
6117 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
6118 | && ecs->event_thread->control.trap_expected | |
6119 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
6120 | stopped_by_watchpoint = 0; |
6121 | else | |
6122 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
6123 | ||
6124 | /* If necessary, step over this watchpoint. We'll be back to display | |
6125 | it in a moment. */ | |
6126 | if (stopped_by_watchpoint | |
9aed480c | 6127 | && (target_have_steppable_watchpoint () |
568d6575 | 6128 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 6129 | { |
488f131b | 6130 | /* At this point, we are stopped at an instruction which has |
dda83cd7 SM |
6131 | attempted to write to a piece of memory under control of |
6132 | a watchpoint. The instruction hasn't actually executed | |
6133 | yet. If we were to evaluate the watchpoint expression | |
6134 | now, we would get the old value, and therefore no change | |
6135 | would seem to have occurred. | |
6136 | ||
6137 | In order to make watchpoints work `right', we really need | |
6138 | to complete the memory write, and then evaluate the | |
6139 | watchpoint expression. We do this by single-stepping the | |
d983da9c DJ |
6140 | target. |
6141 | ||
7f89fd65 | 6142 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
6143 | it. For example, the PA can (with some kernel cooperation) |
6144 | single step over a watchpoint without disabling the watchpoint. | |
6145 | ||
6146 | It is far more common to need to disable a watchpoint to step | |
6147 | the inferior over it. If we have non-steppable watchpoints, | |
6148 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
6149 | disable all watchpoints. |
6150 | ||
6151 | Any breakpoint at PC must also be stepped over -- if there's | |
6152 | one, it will have already triggered before the watchpoint | |
6153 | triggered, and we either already reported it to the user, or | |
6154 | it didn't cause a stop and we called keep_going. In either | |
6155 | case, if there was a breakpoint at PC, we must be trying to | |
6156 | step past it. */ | |
6157 | ecs->event_thread->stepping_over_watchpoint = 1; | |
6158 | keep_going (ecs); | |
488f131b JB |
6159 | return; |
6160 | } | |
6161 | ||
4e1c45ea | 6162 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 6163 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
6164 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
6165 | ecs->event_thread->control.stop_step = 0; | |
c4464ade | 6166 | stop_print_frame = true; |
488f131b | 6167 | stopped_by_random_signal = 0; |
ddfe970e | 6168 | bpstat stop_chain = NULL; |
488f131b | 6169 | |
edb3359d DJ |
6170 | /* Hide inlined functions starting here, unless we just performed stepi or |
6171 | nexti. After stepi and nexti, always show the innermost frame (not any | |
6172 | inline function call sites). */ | |
16c381f0 | 6173 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 6174 | { |
00431a78 PA |
6175 | const address_space *aspace |
6176 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
6177 | |
6178 | /* skip_inline_frames is expensive, so we avoid it if we can | |
6179 | determine that the address is one where functions cannot have | |
6180 | been inlined. This improves performance with inferiors that | |
6181 | load a lot of shared libraries, because the solib event | |
6182 | breakpoint is defined as the address of a function (i.e. not | |
6183 | inline). Note that we have to check the previous PC as well | |
6184 | as the current one to catch cases when we have just | |
6185 | single-stepped off a breakpoint prior to reinstating it. | |
6186 | Note that we're assuming that the code we single-step to is | |
6187 | not inline, but that's not definitive: there's nothing | |
6188 | preventing the event breakpoint function from containing | |
6189 | inlined code, and the single-step ending up there. If the | |
6190 | user had set a breakpoint on that inlined code, the missing | |
6191 | skip_inline_frames call would break things. Fortunately | |
6192 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
6193 | if (!pc_at_non_inline_function (aspace, |
6194 | ecs->event_thread->suspend.stop_pc, | |
6195 | &ecs->ws) | |
a210c238 MR |
6196 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
6197 | && ecs->event_thread->control.trap_expected | |
6198 | && pc_at_non_inline_function (aspace, | |
6199 | ecs->event_thread->prev_pc, | |
09ac7c10 | 6200 | &ecs->ws))) |
1c5a993e | 6201 | { |
f2ffa92b PA |
6202 | stop_chain = build_bpstat_chain (aspace, |
6203 | ecs->event_thread->suspend.stop_pc, | |
6204 | &ecs->ws); | |
00431a78 | 6205 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
6206 | |
6207 | /* Re-fetch current thread's frame in case that invalidated | |
6208 | the frame cache. */ | |
6209 | frame = get_current_frame (); | |
6210 | gdbarch = get_frame_arch (frame); | |
6211 | } | |
0574c78f | 6212 | } |
edb3359d | 6213 | |
a493e3e2 | 6214 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 6215 | && ecs->event_thread->control.trap_expected |
568d6575 | 6216 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6217 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6218 | { |
b50d7442 | 6219 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6220 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6221 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6222 | with a delay slot. It needs to be stepped twice, once for |
6223 | the instruction and once for the delay slot. */ | |
6224 | int step_through_delay | |
568d6575 | 6225 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6226 | |
1eb8556f SM |
6227 | if (step_through_delay) |
6228 | infrun_debug_printf ("step through delay"); | |
6229 | ||
16c381f0 JK |
6230 | if (ecs->event_thread->control.step_range_end == 0 |
6231 | && step_through_delay) | |
3352ef37 AC |
6232 | { |
6233 | /* The user issued a continue when stopped at a breakpoint. | |
6234 | Set up for another trap and get out of here. */ | |
dda83cd7 SM |
6235 | ecs->event_thread->stepping_over_breakpoint = 1; |
6236 | keep_going (ecs); | |
6237 | return; | |
3352ef37 AC |
6238 | } |
6239 | else if (step_through_delay) | |
6240 | { | |
6241 | /* The user issued a step when stopped at a breakpoint. | |
6242 | Maybe we should stop, maybe we should not - the delay | |
6243 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6244 | case, don't decide that here, just set |
6245 | ecs->stepping_over_breakpoint, making sure we | |
6246 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6247 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6248 | } |
6249 | } | |
6250 | ||
ab04a2af TT |
6251 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6252 | handles this event. */ | |
6253 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6254 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
6255 | ecs->event_thread->suspend.stop_pc, |
6256 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 6257 | |
ab04a2af TT |
6258 | /* Following in case break condition called a |
6259 | function. */ | |
c4464ade | 6260 | stop_print_frame = true; |
73dd234f | 6261 | |
ab04a2af TT |
6262 | /* This is where we handle "moribund" watchpoints. Unlike |
6263 | software breakpoints traps, hardware watchpoint traps are | |
6264 | always distinguishable from random traps. If no high-level | |
6265 | watchpoint is associated with the reported stop data address | |
6266 | anymore, then the bpstat does not explain the signal --- | |
6267 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6268 | set. */ | |
6269 | ||
1eb8556f | 6270 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
47591c29 | 6271 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6272 | GDB_SIGNAL_TRAP) |
ab04a2af | 6273 | && stopped_by_watchpoint) |
1eb8556f SM |
6274 | { |
6275 | infrun_debug_printf ("no user watchpoint explains watchpoint SIGTRAP, " | |
6276 | "ignoring"); | |
6277 | } | |
73dd234f | 6278 | |
bac7d97b | 6279 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6280 | at one stage in the past included checks for an inferior |
6281 | function call's call dummy's return breakpoint. The original | |
6282 | comment, that went with the test, read: | |
03cebad2 | 6283 | |
ab04a2af TT |
6284 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6285 | another signal besides SIGTRAP, so check here as well as | |
6286 | above.'' | |
73dd234f | 6287 | |
ab04a2af TT |
6288 | If someone ever tries to get call dummys on a |
6289 | non-executable stack to work (where the target would stop | |
6290 | with something like a SIGSEGV), then those tests might need | |
6291 | to be re-instated. Given, however, that the tests were only | |
6292 | enabled when momentary breakpoints were not being used, I | |
6293 | suspect that it won't be the case. | |
488f131b | 6294 | |
ab04a2af TT |
6295 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6296 | be necessary for call dummies on a non-executable stack on | |
6297 | SPARC. */ | |
488f131b | 6298 | |
bac7d97b | 6299 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6300 | random_signal |
6301 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
6302 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 6303 | |
1cf4d951 PA |
6304 | /* Maybe this was a trap for a software breakpoint that has since |
6305 | been removed. */ | |
6306 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6307 | { | |
5133a315 LM |
6308 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
6309 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
6310 | { |
6311 | struct regcache *regcache; | |
6312 | int decr_pc; | |
6313 | ||
6314 | /* Re-adjust PC to what the program would see if GDB was not | |
6315 | debugging it. */ | |
00431a78 | 6316 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6317 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6318 | if (decr_pc != 0) |
6319 | { | |
07036511 TT |
6320 | gdb::optional<scoped_restore_tmpl<int>> |
6321 | restore_operation_disable; | |
1cf4d951 PA |
6322 | |
6323 | if (record_full_is_used ()) | |
07036511 TT |
6324 | restore_operation_disable.emplace |
6325 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6326 | |
f2ffa92b PA |
6327 | regcache_write_pc (regcache, |
6328 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
6329 | } |
6330 | } | |
6331 | else | |
6332 | { | |
6333 | /* A delayed software breakpoint event. Ignore the trap. */ | |
1eb8556f | 6334 | infrun_debug_printf ("delayed software breakpoint trap, ignoring"); |
1cf4d951 PA |
6335 | random_signal = 0; |
6336 | } | |
6337 | } | |
6338 | ||
6339 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6340 | has since been removed. */ | |
6341 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6342 | { | |
6343 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
1eb8556f SM |
6344 | infrun_debug_printf ("delayed hardware breakpoint/watchpoint " |
6345 | "trap, ignoring"); | |
1cf4d951 PA |
6346 | random_signal = 0; |
6347 | } | |
6348 | ||
bac7d97b PA |
6349 | /* If not, perhaps stepping/nexting can. */ |
6350 | if (random_signal) | |
6351 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6352 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6353 | |
2adfaa28 PA |
6354 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6355 | thread. Single-step breakpoints are transparent to the | |
6356 | breakpoints module. */ | |
6357 | if (random_signal) | |
6358 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6359 | ||
bac7d97b PA |
6360 | /* No? Perhaps we got a moribund watchpoint. */ |
6361 | if (random_signal) | |
6362 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6363 | |
c65d6b55 PA |
6364 | /* Always stop if the user explicitly requested this thread to |
6365 | remain stopped. */ | |
6366 | if (ecs->event_thread->stop_requested) | |
6367 | { | |
6368 | random_signal = 1; | |
1eb8556f | 6369 | infrun_debug_printf ("user-requested stop"); |
c65d6b55 PA |
6370 | } |
6371 | ||
488f131b JB |
6372 | /* For the program's own signals, act according to |
6373 | the signal handling tables. */ | |
6374 | ||
ce12b012 | 6375 | if (random_signal) |
488f131b JB |
6376 | { |
6377 | /* Signal not for debugging purposes. */ | |
c9737c08 | 6378 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6379 | |
1eb8556f SM |
6380 | infrun_debug_printf ("random signal (%s)", |
6381 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6382 | |
488f131b JB |
6383 | stopped_by_random_signal = 1; |
6384 | ||
252fbfc8 PA |
6385 | /* Always stop on signals if we're either just gaining control |
6386 | of the program, or the user explicitly requested this thread | |
6387 | to remain stopped. */ | |
d6b48e9c | 6388 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6389 | || ecs->event_thread->stop_requested |
8ff53139 | 6390 | || signal_stop_state (ecs->event_thread->suspend.stop_signal)) |
488f131b | 6391 | { |
22bcd14b | 6392 | stop_waiting (ecs); |
488f131b JB |
6393 | return; |
6394 | } | |
b57bacec PA |
6395 | |
6396 | /* Notify observers the signal has "handle print" set. Note we | |
6397 | returned early above if stopping; normal_stop handles the | |
6398 | printing in that case. */ | |
6399 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6400 | { | |
6401 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6402 | target_terminal::ours_for_output (); |
76727919 | 6403 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 6404 | target_terminal::inferior (); |
b57bacec | 6405 | } |
488f131b JB |
6406 | |
6407 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6408 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6409 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6410 | |
f2ffa92b | 6411 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 6412 | && ecs->event_thread->control.trap_expected |
8358c15c | 6413 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6414 | { |
6415 | /* We were just starting a new sequence, attempting to | |
6416 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6417 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6418 | of the stepping range so GDB needs to remember to, when |
6419 | the signal handler returns, resume stepping off that | |
6420 | breakpoint. */ | |
6421 | /* To simplify things, "continue" is forced to use the same | |
6422 | code paths as single-step - set a breakpoint at the | |
6423 | signal return address and then, once hit, step off that | |
6424 | breakpoint. */ | |
1eb8556f | 6425 | infrun_debug_printf ("signal arrived while stepping over breakpoint"); |
d3169d93 | 6426 | |
2c03e5be | 6427 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6428 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6429 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6430 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6431 | |
6432 | /* If we were nexting/stepping some other thread, switch to | |
6433 | it, so that we don't continue it, losing control. */ | |
6434 | if (!switch_back_to_stepped_thread (ecs)) | |
6435 | keep_going (ecs); | |
9d799f85 | 6436 | return; |
68f53502 | 6437 | } |
9d799f85 | 6438 | |
e5f8a7cc | 6439 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
6440 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6441 | ecs->event_thread) | |
e5f8a7cc | 6442 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 6443 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6444 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6445 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6446 | { |
6447 | /* The inferior is about to take a signal that will take it | |
6448 | out of the single step range. Set a breakpoint at the | |
6449 | current PC (which is presumably where the signal handler | |
6450 | will eventually return) and then allow the inferior to | |
6451 | run free. | |
6452 | ||
6453 | Note that this is only needed for a signal delivered | |
6454 | while in the single-step range. Nested signals aren't a | |
6455 | problem as they eventually all return. */ | |
1eb8556f | 6456 | infrun_debug_printf ("signal may take us out of single-step range"); |
237fc4c9 | 6457 | |
372316f1 | 6458 | clear_step_over_info (); |
2c03e5be | 6459 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6460 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6461 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6462 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6463 | keep_going (ecs); |
6464 | return; | |
d303a6c7 | 6465 | } |
9d799f85 | 6466 | |
85102364 | 6467 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6468 | when either there's a nested signal, or when there's a |
6469 | pending signal enabled just as the signal handler returns | |
6470 | (leaving the inferior at the step-resume-breakpoint without | |
6471 | actually executing it). Either way continue until the | |
6472 | breakpoint is really hit. */ | |
c447ac0b PA |
6473 | |
6474 | if (!switch_back_to_stepped_thread (ecs)) | |
6475 | { | |
1eb8556f | 6476 | infrun_debug_printf ("random signal, keep going"); |
c447ac0b PA |
6477 | |
6478 | keep_going (ecs); | |
6479 | } | |
6480 | return; | |
488f131b | 6481 | } |
94c57d6a PA |
6482 | |
6483 | process_event_stop_test (ecs); | |
6484 | } | |
6485 | ||
6486 | /* Come here when we've got some debug event / signal we can explain | |
6487 | (IOW, not a random signal), and test whether it should cause a | |
6488 | stop, or whether we should resume the inferior (transparently). | |
6489 | E.g., could be a breakpoint whose condition evaluates false; we | |
6490 | could be still stepping within the line; etc. */ | |
6491 | ||
6492 | static void | |
6493 | process_event_stop_test (struct execution_control_state *ecs) | |
6494 | { | |
6495 | struct symtab_and_line stop_pc_sal; | |
6496 | struct frame_info *frame; | |
6497 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6498 | CORE_ADDR jmp_buf_pc; |
6499 | struct bpstat_what what; | |
94c57d6a | 6500 | |
cdaa5b73 | 6501 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6502 | |
cdaa5b73 PA |
6503 | frame = get_current_frame (); |
6504 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6505 | |
cdaa5b73 | 6506 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6507 | |
cdaa5b73 PA |
6508 | if (what.call_dummy) |
6509 | { | |
6510 | stop_stack_dummy = what.call_dummy; | |
6511 | } | |
186c406b | 6512 | |
243a9253 PA |
6513 | /* A few breakpoint types have callbacks associated (e.g., |
6514 | bp_jit_event). Run them now. */ | |
6515 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6516 | ||
cdaa5b73 PA |
6517 | /* If we hit an internal event that triggers symbol changes, the |
6518 | current frame will be invalidated within bpstat_what (e.g., if we | |
6519 | hit an internal solib event). Re-fetch it. */ | |
6520 | frame = get_current_frame (); | |
6521 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6522 | |
cdaa5b73 PA |
6523 | switch (what.main_action) |
6524 | { | |
6525 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6526 | /* If we hit the breakpoint at longjmp while stepping, we | |
6527 | install a momentary breakpoint at the target of the | |
6528 | jmp_buf. */ | |
186c406b | 6529 | |
1eb8556f | 6530 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME"); |
186c406b | 6531 | |
cdaa5b73 | 6532 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6533 | |
cdaa5b73 PA |
6534 | if (what.is_longjmp) |
6535 | { | |
6536 | struct value *arg_value; | |
6537 | ||
6538 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6539 | then use it to extract the arguments. The destination PC | |
6540 | is the third argument to the probe. */ | |
6541 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6542 | if (arg_value) | |
8fa0c4f8 AA |
6543 | { |
6544 | jmp_buf_pc = value_as_address (arg_value); | |
6545 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6546 | } | |
cdaa5b73 PA |
6547 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6548 | || !gdbarch_get_longjmp_target (gdbarch, | |
6549 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6550 | { |
1eb8556f SM |
6551 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME " |
6552 | "(!gdbarch_get_longjmp_target)"); | |
cdaa5b73 PA |
6553 | keep_going (ecs); |
6554 | return; | |
e2e4d78b | 6555 | } |
e2e4d78b | 6556 | |
cdaa5b73 PA |
6557 | /* Insert a breakpoint at resume address. */ |
6558 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6559 | } | |
6560 | else | |
6561 | check_exception_resume (ecs, frame); | |
6562 | keep_going (ecs); | |
6563 | return; | |
e81a37f7 | 6564 | |
cdaa5b73 PA |
6565 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6566 | { | |
6567 | struct frame_info *init_frame; | |
e81a37f7 | 6568 | |
cdaa5b73 | 6569 | /* There are several cases to consider. |
c906108c | 6570 | |
cdaa5b73 PA |
6571 | 1. The initiating frame no longer exists. In this case we |
6572 | must stop, because the exception or longjmp has gone too | |
6573 | far. | |
2c03e5be | 6574 | |
cdaa5b73 PA |
6575 | 2. The initiating frame exists, and is the same as the |
6576 | current frame. We stop, because the exception or longjmp | |
6577 | has been caught. | |
2c03e5be | 6578 | |
cdaa5b73 PA |
6579 | 3. The initiating frame exists and is different from the |
6580 | current frame. This means the exception or longjmp has | |
6581 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6582 | |
cdaa5b73 PA |
6583 | 4. longjmp breakpoint has been placed just to protect |
6584 | against stale dummy frames and user is not interested in | |
6585 | stopping around longjmps. */ | |
c5aa993b | 6586 | |
1eb8556f | 6587 | infrun_debug_printf ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME"); |
c5aa993b | 6588 | |
cdaa5b73 PA |
6589 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6590 | != NULL); | |
6591 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6592 | |
cdaa5b73 PA |
6593 | if (what.is_longjmp) |
6594 | { | |
b67a2c6f | 6595 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6596 | |
cdaa5b73 | 6597 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6598 | { |
cdaa5b73 PA |
6599 | /* Case 4. */ |
6600 | keep_going (ecs); | |
6601 | return; | |
e5ef252a | 6602 | } |
cdaa5b73 | 6603 | } |
c5aa993b | 6604 | |
cdaa5b73 | 6605 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6606 | |
cdaa5b73 PA |
6607 | if (init_frame) |
6608 | { | |
6609 | struct frame_id current_id | |
6610 | = get_frame_id (get_current_frame ()); | |
6611 | if (frame_id_eq (current_id, | |
6612 | ecs->event_thread->initiating_frame)) | |
6613 | { | |
6614 | /* Case 2. Fall through. */ | |
6615 | } | |
6616 | else | |
6617 | { | |
6618 | /* Case 3. */ | |
6619 | keep_going (ecs); | |
6620 | return; | |
6621 | } | |
68f53502 | 6622 | } |
488f131b | 6623 | |
cdaa5b73 PA |
6624 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6625 | exists. */ | |
6626 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6627 | |
bdc36728 | 6628 | end_stepping_range (ecs); |
cdaa5b73 PA |
6629 | } |
6630 | return; | |
e5ef252a | 6631 | |
cdaa5b73 | 6632 | case BPSTAT_WHAT_SINGLE: |
1eb8556f | 6633 | infrun_debug_printf ("BPSTAT_WHAT_SINGLE"); |
cdaa5b73 PA |
6634 | ecs->event_thread->stepping_over_breakpoint = 1; |
6635 | /* Still need to check other stuff, at least the case where we | |
6636 | are stepping and step out of the right range. */ | |
6637 | break; | |
e5ef252a | 6638 | |
cdaa5b73 | 6639 | case BPSTAT_WHAT_STEP_RESUME: |
1eb8556f | 6640 | infrun_debug_printf ("BPSTAT_WHAT_STEP_RESUME"); |
e5ef252a | 6641 | |
cdaa5b73 PA |
6642 | delete_step_resume_breakpoint (ecs->event_thread); |
6643 | if (ecs->event_thread->control.proceed_to_finish | |
6644 | && execution_direction == EXEC_REVERSE) | |
6645 | { | |
6646 | struct thread_info *tp = ecs->event_thread; | |
6647 | ||
6648 | /* We are finishing a function in reverse, and just hit the | |
6649 | step-resume breakpoint at the start address of the | |
6650 | function, and we're almost there -- just need to back up | |
6651 | by one more single-step, which should take us back to the | |
6652 | function call. */ | |
6653 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6654 | keep_going (ecs); | |
e5ef252a | 6655 | return; |
cdaa5b73 PA |
6656 | } |
6657 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6658 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6659 | && execution_direction == EXEC_REVERSE) |
6660 | { | |
6661 | /* We are stepping over a function call in reverse, and just | |
6662 | hit the step-resume breakpoint at the start address of | |
6663 | the function. Go back to single-stepping, which should | |
6664 | take us back to the function call. */ | |
6665 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6666 | keep_going (ecs); | |
6667 | return; | |
6668 | } | |
6669 | break; | |
e5ef252a | 6670 | |
cdaa5b73 | 6671 | case BPSTAT_WHAT_STOP_NOISY: |
1eb8556f | 6672 | infrun_debug_printf ("BPSTAT_WHAT_STOP_NOISY"); |
c4464ade | 6673 | stop_print_frame = true; |
e5ef252a | 6674 | |
33bf4c5c | 6675 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6676 | whether a/the breakpoint is there when the thread is next |
6677 | resumed. */ | |
6678 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6679 | |
22bcd14b | 6680 | stop_waiting (ecs); |
cdaa5b73 | 6681 | return; |
e5ef252a | 6682 | |
cdaa5b73 | 6683 | case BPSTAT_WHAT_STOP_SILENT: |
1eb8556f | 6684 | infrun_debug_printf ("BPSTAT_WHAT_STOP_SILENT"); |
c4464ade | 6685 | stop_print_frame = false; |
e5ef252a | 6686 | |
33bf4c5c | 6687 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6688 | whether a/the breakpoint is there when the thread is next |
6689 | resumed. */ | |
6690 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6691 | stop_waiting (ecs); |
cdaa5b73 PA |
6692 | return; |
6693 | ||
6694 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
1eb8556f | 6695 | infrun_debug_printf ("BPSTAT_WHAT_HP_STEP_RESUME"); |
cdaa5b73 PA |
6696 | |
6697 | delete_step_resume_breakpoint (ecs->event_thread); | |
6698 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6699 | { | |
6700 | /* Back when the step-resume breakpoint was inserted, we | |
6701 | were trying to single-step off a breakpoint. Go back to | |
6702 | doing that. */ | |
6703 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6704 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6705 | keep_going (ecs); | |
6706 | return; | |
e5ef252a | 6707 | } |
cdaa5b73 PA |
6708 | break; |
6709 | ||
6710 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6711 | break; | |
e5ef252a | 6712 | } |
c906108c | 6713 | |
af48d08f PA |
6714 | /* If we stepped a permanent breakpoint and we had a high priority |
6715 | step-resume breakpoint for the address we stepped, but we didn't | |
6716 | hit it, then we must have stepped into the signal handler. The | |
6717 | step-resume was only necessary to catch the case of _not_ | |
6718 | stepping into the handler, so delete it, and fall through to | |
6719 | checking whether the step finished. */ | |
6720 | if (ecs->event_thread->stepped_breakpoint) | |
6721 | { | |
6722 | struct breakpoint *sr_bp | |
6723 | = ecs->event_thread->control.step_resume_breakpoint; | |
6724 | ||
8d707a12 PA |
6725 | if (sr_bp != NULL |
6726 | && sr_bp->loc->permanent | |
af48d08f PA |
6727 | && sr_bp->type == bp_hp_step_resume |
6728 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6729 | { | |
1eb8556f | 6730 | infrun_debug_printf ("stepped permanent breakpoint, stopped in handler"); |
af48d08f PA |
6731 | delete_step_resume_breakpoint (ecs->event_thread); |
6732 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6733 | } | |
6734 | } | |
6735 | ||
cdaa5b73 PA |
6736 | /* We come here if we hit a breakpoint but should not stop for it. |
6737 | Possibly we also were stepping and should stop for that. So fall | |
6738 | through and test for stepping. But, if not stepping, do not | |
6739 | stop. */ | |
c906108c | 6740 | |
a7212384 UW |
6741 | /* In all-stop mode, if we're currently stepping but have stopped in |
6742 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6743 | if (switch_back_to_stepped_thread (ecs)) |
6744 | return; | |
776f04fa | 6745 | |
8358c15c | 6746 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6747 | { |
1eb8556f | 6748 | infrun_debug_printf ("step-resume breakpoint is inserted"); |
527159b7 | 6749 | |
488f131b | 6750 | /* Having a step-resume breakpoint overrides anything |
dda83cd7 SM |
6751 | else having to do with stepping commands until |
6752 | that breakpoint is reached. */ | |
488f131b JB |
6753 | keep_going (ecs); |
6754 | return; | |
6755 | } | |
c5aa993b | 6756 | |
16c381f0 | 6757 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6758 | { |
1eb8556f | 6759 | infrun_debug_printf ("no stepping, continue"); |
488f131b | 6760 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6761 | keep_going (ecs); |
6762 | return; | |
6763 | } | |
c5aa993b | 6764 | |
4b7703ad JB |
6765 | /* Re-fetch current thread's frame in case the code above caused |
6766 | the frame cache to be re-initialized, making our FRAME variable | |
6767 | a dangling pointer. */ | |
6768 | frame = get_current_frame (); | |
628fe4e4 | 6769 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6770 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6771 | |
488f131b | 6772 | /* If stepping through a line, keep going if still within it. |
c906108c | 6773 | |
488f131b JB |
6774 | Note that step_range_end is the address of the first instruction |
6775 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6776 | within it! |
6777 | ||
6778 | Note also that during reverse execution, we may be stepping | |
6779 | through a function epilogue and therefore must detect when | |
6780 | the current-frame changes in the middle of a line. */ | |
6781 | ||
f2ffa92b PA |
6782 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6783 | ecs->event_thread) | |
31410e84 | 6784 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6785 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6786 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6787 | { |
1eb8556f SM |
6788 | infrun_debug_printf |
6789 | ("stepping inside range [%s-%s]", | |
6790 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
6791 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6792 | |
c1e36e3e PA |
6793 | /* Tentatively re-enable range stepping; `resume' disables it if |
6794 | necessary (e.g., if we're stepping over a breakpoint or we | |
6795 | have software watchpoints). */ | |
6796 | ecs->event_thread->control.may_range_step = 1; | |
6797 | ||
b2175913 MS |
6798 | /* When stepping backward, stop at beginning of line range |
6799 | (unless it's the function entry point, in which case | |
6800 | keep going back to the call point). */ | |
f2ffa92b | 6801 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6802 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6803 | && stop_pc != ecs->stop_func_start |
6804 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6805 | end_stepping_range (ecs); |
b2175913 MS |
6806 | else |
6807 | keep_going (ecs); | |
6808 | ||
488f131b JB |
6809 | return; |
6810 | } | |
c5aa993b | 6811 | |
488f131b | 6812 | /* We stepped out of the stepping range. */ |
c906108c | 6813 | |
488f131b | 6814 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6815 | loader dynamic symbol resolution code... |
6816 | ||
6817 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6818 | time loader code and reach the callee's address. | |
6819 | ||
6820 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6821 | the runtime loader code is handled just like any other | |
6822 | undebuggable function call. Now we need only keep stepping | |
6823 | backward through the trampoline code, and that's handled further | |
6824 | down, so there is nothing for us to do here. */ | |
6825 | ||
6826 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6827 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6828 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6829 | { |
4c8c40e6 | 6830 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6831 | gdbarch_skip_solib_resolver (gdbarch, |
6832 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6833 | |
1eb8556f | 6834 | infrun_debug_printf ("stepped into dynsym resolve code"); |
527159b7 | 6835 | |
488f131b JB |
6836 | if (pc_after_resolver) |
6837 | { | |
6838 | /* Set up a step-resume breakpoint at the address | |
6839 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6840 | symtab_and_line sr_sal; |
488f131b | 6841 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6842 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6843 | |
a6d9a66e UW |
6844 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6845 | sr_sal, null_frame_id); | |
c5aa993b | 6846 | } |
c906108c | 6847 | |
488f131b JB |
6848 | keep_going (ecs); |
6849 | return; | |
6850 | } | |
c906108c | 6851 | |
1d509aa6 MM |
6852 | /* Step through an indirect branch thunk. */ |
6853 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6854 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6855 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 | 6856 | { |
1eb8556f | 6857 | infrun_debug_printf ("stepped into indirect branch thunk"); |
1d509aa6 MM |
6858 | keep_going (ecs); |
6859 | return; | |
6860 | } | |
6861 | ||
16c381f0 JK |
6862 | if (ecs->event_thread->control.step_range_end != 1 |
6863 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6864 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6865 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6866 | { |
1eb8556f | 6867 | infrun_debug_printf ("stepped into signal trampoline"); |
42edda50 | 6868 | /* The inferior, while doing a "step" or "next", has ended up in |
dda83cd7 SM |
6869 | a signal trampoline (either by a signal being delivered or by |
6870 | the signal handler returning). Just single-step until the | |
6871 | inferior leaves the trampoline (either by calling the handler | |
6872 | or returning). */ | |
488f131b JB |
6873 | keep_going (ecs); |
6874 | return; | |
6875 | } | |
c906108c | 6876 | |
14132e89 MR |
6877 | /* If we're in the return path from a shared library trampoline, |
6878 | we want to proceed through the trampoline when stepping. */ | |
6879 | /* macro/2012-04-25: This needs to come before the subroutine | |
6880 | call check below as on some targets return trampolines look | |
6881 | like subroutine calls (MIPS16 return thunks). */ | |
6882 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
6883 | ecs->event_thread->suspend.stop_pc, |
6884 | ecs->stop_func_name) | |
14132e89 MR |
6885 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6886 | { | |
6887 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
6888 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6889 | CORE_ADDR real_stop_pc | |
6890 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 | 6891 | |
1eb8556f | 6892 | infrun_debug_printf ("stepped into solib return tramp"); |
14132e89 MR |
6893 | |
6894 | /* Only proceed through if we know where it's going. */ | |
6895 | if (real_stop_pc) | |
6896 | { | |
6897 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6898 | symtab_and_line sr_sal; |
14132e89 MR |
6899 | sr_sal.pc = real_stop_pc; |
6900 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6901 | sr_sal.pspace = get_frame_program_space (frame); | |
6902 | ||
6903 | /* Do not specify what the fp should be when we stop since | |
6904 | on some machines the prologue is where the new fp value | |
6905 | is established. */ | |
6906 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6907 | sr_sal, null_frame_id); | |
6908 | ||
6909 | /* Restart without fiddling with the step ranges or | |
6910 | other state. */ | |
6911 | keep_going (ecs); | |
6912 | return; | |
6913 | } | |
6914 | } | |
6915 | ||
c17eaafe DJ |
6916 | /* Check for subroutine calls. The check for the current frame |
6917 | equalling the step ID is not necessary - the check of the | |
6918 | previous frame's ID is sufficient - but it is a common case and | |
6919 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6920 | |
6921 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6922 | being equal, so to get into this block, both the current and | |
6923 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6924 | /* The outer_frame_id check is a heuristic to detect stepping |
6925 | through startup code. If we step over an instruction which | |
6926 | sets the stack pointer from an invalid value to a valid value, | |
6927 | we may detect that as a subroutine call from the mythical | |
6928 | "outermost" function. This could be fixed by marking | |
6929 | outermost frames as !stack_p,code_p,special_p. Then the | |
6930 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6931 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6932 | for more. */ |
edb3359d | 6933 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6934 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6935 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6936 | ecs->event_thread->control.step_stack_frame_id) |
6937 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6938 | outer_frame_id) |
885eeb5b | 6939 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 6940 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 6941 | { |
f2ffa92b | 6942 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 6943 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6944 | |
1eb8556f | 6945 | infrun_debug_printf ("stepped into subroutine"); |
527159b7 | 6946 | |
b7a084be | 6947 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6948 | { |
6949 | /* I presume that step_over_calls is only 0 when we're | |
6950 | supposed to be stepping at the assembly language level | |
6951 | ("stepi"). Just stop. */ | |
388a8562 | 6952 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6953 | end_stepping_range (ecs); |
95918acb AC |
6954 | return; |
6955 | } | |
8fb3e588 | 6956 | |
388a8562 MS |
6957 | /* Reverse stepping through solib trampolines. */ |
6958 | ||
6959 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6960 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6961 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6962 | || (ecs->stop_func_start == 0 | |
6963 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6964 | { | |
6965 | /* Any solib trampoline code can be handled in reverse | |
6966 | by simply continuing to single-step. We have already | |
6967 | executed the solib function (backwards), and a few | |
6968 | steps will take us back through the trampoline to the | |
6969 | caller. */ | |
6970 | keep_going (ecs); | |
6971 | return; | |
6972 | } | |
6973 | ||
16c381f0 | 6974 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6975 | { |
b2175913 MS |
6976 | /* We're doing a "next". |
6977 | ||
6978 | Normal (forward) execution: set a breakpoint at the | |
6979 | callee's return address (the address at which the caller | |
6980 | will resume). | |
6981 | ||
6982 | Reverse (backward) execution. set the step-resume | |
6983 | breakpoint at the start of the function that we just | |
6984 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6985 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6986 | |
6987 | if (execution_direction == EXEC_REVERSE) | |
6988 | { | |
acf9414f JK |
6989 | /* If we're already at the start of the function, we've either |
6990 | just stepped backward into a single instruction function, | |
6991 | or stepped back out of a signal handler to the first instruction | |
6992 | of the function. Just keep going, which will single-step back | |
6993 | to the caller. */ | |
58c48e72 | 6994 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6995 | { |
acf9414f | 6996 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6997 | symtab_and_line sr_sal; |
acf9414f JK |
6998 | sr_sal.pc = ecs->stop_func_start; |
6999 | sr_sal.pspace = get_frame_program_space (frame); | |
7000 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7001 | sr_sal, null_frame_id); | |
7002 | } | |
b2175913 MS |
7003 | } |
7004 | else | |
568d6575 | 7005 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7006 | |
8567c30f AC |
7007 | keep_going (ecs); |
7008 | return; | |
7009 | } | |
a53c66de | 7010 | |
95918acb | 7011 | /* If we are in a function call trampoline (a stub between the |
dda83cd7 SM |
7012 | calling routine and the real function), locate the real |
7013 | function. That's what tells us (a) whether we want to step | |
7014 | into it at all, and (b) what prologue we want to run to the | |
7015 | end of, if we do step into it. */ | |
568d6575 | 7016 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 7017 | if (real_stop_pc == 0) |
568d6575 | 7018 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
7019 | if (real_stop_pc != 0) |
7020 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 7021 | |
db5f024e | 7022 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 7023 | { |
51abb421 | 7024 | symtab_and_line sr_sal; |
1b2bfbb9 | 7025 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 7026 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 7027 | |
a6d9a66e UW |
7028 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7029 | sr_sal, null_frame_id); | |
8fb3e588 AC |
7030 | keep_going (ecs); |
7031 | return; | |
1b2bfbb9 RC |
7032 | } |
7033 | ||
95918acb | 7034 | /* If we have line number information for the function we are |
1bfeeb0f JL |
7035 | thinking of stepping into and the function isn't on the skip |
7036 | list, step into it. | |
95918acb | 7037 | |
dda83cd7 SM |
7038 | If there are several symtabs at that PC (e.g. with include |
7039 | files), just want to know whether *any* of them have line | |
7040 | numbers. find_pc_line handles this. */ | |
95918acb AC |
7041 | { |
7042 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 7043 | |
95918acb | 7044 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 7045 | if (tmp_sal.line != 0 |
85817405 | 7046 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
7047 | tmp_sal) |
7048 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 7049 | { |
b2175913 | 7050 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 7051 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 7052 | else |
568d6575 | 7053 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
7054 | return; |
7055 | } | |
7056 | } | |
7057 | ||
7058 | /* If we have no line number and the step-stop-if-no-debug is | |
dda83cd7 SM |
7059 | set, we stop the step so that the user has a chance to switch |
7060 | in assembly mode. */ | |
16c381f0 | 7061 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 7062 | && step_stop_if_no_debug) |
95918acb | 7063 | { |
bdc36728 | 7064 | end_stepping_range (ecs); |
95918acb AC |
7065 | return; |
7066 | } | |
7067 | ||
b2175913 MS |
7068 | if (execution_direction == EXEC_REVERSE) |
7069 | { | |
acf9414f JK |
7070 | /* If we're already at the start of the function, we've either just |
7071 | stepped backward into a single instruction function without line | |
7072 | number info, or stepped back out of a signal handler to the first | |
7073 | instruction of the function without line number info. Just keep | |
7074 | going, which will single-step back to the caller. */ | |
7075 | if (ecs->stop_func_start != stop_pc) | |
7076 | { | |
7077 | /* Set a breakpoint at callee's start address. | |
7078 | From there we can step once and be back in the caller. */ | |
51abb421 | 7079 | symtab_and_line sr_sal; |
acf9414f JK |
7080 | sr_sal.pc = ecs->stop_func_start; |
7081 | sr_sal.pspace = get_frame_program_space (frame); | |
7082 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7083 | sr_sal, null_frame_id); | |
7084 | } | |
b2175913 MS |
7085 | } |
7086 | else | |
7087 | /* Set a breakpoint at callee's return address (the address | |
7088 | at which the caller will resume). */ | |
568d6575 | 7089 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7090 | |
95918acb | 7091 | keep_going (ecs); |
488f131b | 7092 | return; |
488f131b | 7093 | } |
c906108c | 7094 | |
fdd654f3 MS |
7095 | /* Reverse stepping through solib trampolines. */ |
7096 | ||
7097 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 7098 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 7099 | { |
f2ffa92b PA |
7100 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
7101 | ||
fdd654f3 MS |
7102 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
7103 | || (ecs->stop_func_start == 0 | |
7104 | && in_solib_dynsym_resolve_code (stop_pc))) | |
7105 | { | |
7106 | /* Any solib trampoline code can be handled in reverse | |
7107 | by simply continuing to single-step. We have already | |
7108 | executed the solib function (backwards), and a few | |
7109 | steps will take us back through the trampoline to the | |
7110 | caller. */ | |
7111 | keep_going (ecs); | |
7112 | return; | |
7113 | } | |
7114 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
7115 | { | |
7116 | /* Stepped backward into the solib dynsym resolver. | |
7117 | Set a breakpoint at its start and continue, then | |
7118 | one more step will take us out. */ | |
51abb421 | 7119 | symtab_and_line sr_sal; |
fdd654f3 | 7120 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 7121 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
7122 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7123 | sr_sal, null_frame_id); | |
7124 | keep_going (ecs); | |
7125 | return; | |
7126 | } | |
7127 | } | |
7128 | ||
8c95582d AB |
7129 | /* This always returns the sal for the inner-most frame when we are in a |
7130 | stack of inlined frames, even if GDB actually believes that it is in a | |
7131 | more outer frame. This is checked for below by calls to | |
7132 | inline_skipped_frames. */ | |
f2ffa92b | 7133 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 7134 | |
1b2bfbb9 RC |
7135 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
7136 | the trampoline processing logic, however, there are some trampolines | |
7137 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 7138 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 7139 | && ecs->stop_func_name == NULL |
2afb61aa | 7140 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 7141 | { |
1eb8556f | 7142 | infrun_debug_printf ("stepped into undebuggable function"); |
527159b7 | 7143 | |
1b2bfbb9 | 7144 | /* The inferior just stepped into, or returned to, an |
dda83cd7 SM |
7145 | undebuggable function (where there is no debugging information |
7146 | and no line number corresponding to the address where the | |
7147 | inferior stopped). Since we want to skip this kind of code, | |
7148 | we keep going until the inferior returns from this | |
7149 | function - unless the user has asked us not to (via | |
7150 | set step-mode) or we no longer know how to get back | |
7151 | to the call site. */ | |
14e60db5 | 7152 | if (step_stop_if_no_debug |
c7ce8faa | 7153 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
7154 | { |
7155 | /* If we have no line number and the step-stop-if-no-debug | |
7156 | is set, we stop the step so that the user has a chance to | |
7157 | switch in assembly mode. */ | |
bdc36728 | 7158 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7159 | return; |
7160 | } | |
7161 | else | |
7162 | { | |
7163 | /* Set a breakpoint at callee's return address (the address | |
7164 | at which the caller will resume). */ | |
568d6575 | 7165 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
7166 | keep_going (ecs); |
7167 | return; | |
7168 | } | |
7169 | } | |
7170 | ||
16c381f0 | 7171 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
7172 | { |
7173 | /* It is stepi or nexti. We always want to stop stepping after | |
dda83cd7 | 7174 | one instruction. */ |
1eb8556f | 7175 | infrun_debug_printf ("stepi/nexti"); |
bdc36728 | 7176 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7177 | return; |
7178 | } | |
7179 | ||
2afb61aa | 7180 | if (stop_pc_sal.line == 0) |
488f131b JB |
7181 | { |
7182 | /* We have no line number information. That means to stop | |
dda83cd7 SM |
7183 | stepping (does this always happen right after one instruction, |
7184 | when we do "s" in a function with no line numbers, | |
7185 | or can this happen as a result of a return or longjmp?). */ | |
1eb8556f | 7186 | infrun_debug_printf ("line number info"); |
bdc36728 | 7187 | end_stepping_range (ecs); |
488f131b JB |
7188 | return; |
7189 | } | |
c906108c | 7190 | |
edb3359d DJ |
7191 | /* Look for "calls" to inlined functions, part one. If the inline |
7192 | frame machinery detected some skipped call sites, we have entered | |
7193 | a new inline function. */ | |
7194 | ||
7195 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7196 | ecs->event_thread->control.step_frame_id) |
00431a78 | 7197 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 7198 | { |
1eb8556f | 7199 | infrun_debug_printf ("stepped into inlined function"); |
edb3359d | 7200 | |
51abb421 | 7201 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 7202 | |
16c381f0 | 7203 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
7204 | { |
7205 | /* For "step", we're going to stop. But if the call site | |
7206 | for this inlined function is on the same source line as | |
7207 | we were previously stepping, go down into the function | |
7208 | first. Otherwise stop at the call site. */ | |
7209 | ||
7210 | if (call_sal.line == ecs->event_thread->current_line | |
7211 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7212 | { |
7213 | step_into_inline_frame (ecs->event_thread); | |
7214 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7215 | { | |
7216 | keep_going (ecs); | |
7217 | return; | |
7218 | } | |
7219 | } | |
edb3359d | 7220 | |
bdc36728 | 7221 | end_stepping_range (ecs); |
edb3359d DJ |
7222 | return; |
7223 | } | |
7224 | else | |
7225 | { | |
7226 | /* For "next", we should stop at the call site if it is on a | |
7227 | different source line. Otherwise continue through the | |
7228 | inlined function. */ | |
7229 | if (call_sal.line == ecs->event_thread->current_line | |
7230 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7231 | keep_going (ecs); | |
7232 | else | |
bdc36728 | 7233 | end_stepping_range (ecs); |
edb3359d DJ |
7234 | return; |
7235 | } | |
7236 | } | |
7237 | ||
7238 | /* Look for "calls" to inlined functions, part two. If we are still | |
7239 | in the same real function we were stepping through, but we have | |
7240 | to go further up to find the exact frame ID, we are stepping | |
7241 | through a more inlined call beyond its call site. */ | |
7242 | ||
7243 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
7244 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7245 | ecs->event_thread->control.step_frame_id) |
edb3359d | 7246 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7247 | ecs->event_thread->control.step_frame_id)) |
edb3359d | 7248 | { |
1eb8556f | 7249 | infrun_debug_printf ("stepping through inlined function"); |
edb3359d | 7250 | |
4a4c04f1 BE |
7251 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7252 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7253 | keep_going (ecs); |
7254 | else | |
bdc36728 | 7255 | end_stepping_range (ecs); |
edb3359d DJ |
7256 | return; |
7257 | } | |
7258 | ||
8c95582d | 7259 | bool refresh_step_info = true; |
f2ffa92b | 7260 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea | 7261 | && (ecs->event_thread->current_line != stop_pc_sal.line |
24b21115 | 7262 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) |
488f131b | 7263 | { |
ebde6f2d TV |
7264 | /* We are at a different line. */ |
7265 | ||
8c95582d AB |
7266 | if (stop_pc_sal.is_stmt) |
7267 | { | |
ebde6f2d TV |
7268 | /* We are at the start of a statement. |
7269 | ||
7270 | So stop. Note that we don't stop if we step into the middle of a | |
7271 | statement. That is said to make things like for (;;) statements | |
7272 | work better. */ | |
1eb8556f | 7273 | infrun_debug_printf ("stepped to a different line"); |
8c95582d AB |
7274 | end_stepping_range (ecs); |
7275 | return; | |
7276 | } | |
7277 | else if (frame_id_eq (get_frame_id (get_current_frame ()), | |
ebde6f2d | 7278 | ecs->event_thread->control.step_frame_id)) |
8c95582d | 7279 | { |
ebde6f2d TV |
7280 | /* We are not at the start of a statement, and we have not changed |
7281 | frame. | |
7282 | ||
7283 | We ignore this line table entry, and continue stepping forward, | |
8c95582d AB |
7284 | looking for a better place to stop. */ |
7285 | refresh_step_info = false; | |
1eb8556f SM |
7286 | infrun_debug_printf ("stepped to a different line, but " |
7287 | "it's not the start of a statement"); | |
8c95582d | 7288 | } |
ebde6f2d TV |
7289 | else |
7290 | { | |
7291 | /* We are not the start of a statement, and we have changed frame. | |
7292 | ||
7293 | We ignore this line table entry, and continue stepping forward, | |
7294 | looking for a better place to stop. Keep refresh_step_info at | |
7295 | true to note that the frame has changed, but ignore the line | |
7296 | number to make sure we don't ignore a subsequent entry with the | |
7297 | same line number. */ | |
7298 | stop_pc_sal.line = 0; | |
7299 | infrun_debug_printf ("stepped to a different frame, but " | |
7300 | "it's not the start of a statement"); | |
7301 | } | |
488f131b | 7302 | } |
c906108c | 7303 | |
488f131b | 7304 | /* We aren't done stepping. |
c906108c | 7305 | |
488f131b JB |
7306 | Optimize by setting the stepping range to the line. |
7307 | (We might not be in the original line, but if we entered a | |
7308 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7309 | things like for(;;) statements work better.) |
7310 | ||
7311 | If we entered a SAL that indicates a non-statement line table entry, | |
7312 | then we update the stepping range, but we don't update the step info, | |
7313 | which includes things like the line number we are stepping away from. | |
7314 | This means we will stop when we find a line table entry that is marked | |
7315 | as is-statement, even if it matches the non-statement one we just | |
7316 | stepped into. */ | |
c906108c | 7317 | |
16c381f0 JK |
7318 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7319 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7320 | ecs->event_thread->control.may_range_step = 1; |
8c95582d AB |
7321 | if (refresh_step_info) |
7322 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7323 | |
1eb8556f | 7324 | infrun_debug_printf ("keep going"); |
488f131b | 7325 | keep_going (ecs); |
104c1213 JM |
7326 | } |
7327 | ||
408f6686 PA |
7328 | static bool restart_stepped_thread (process_stratum_target *resume_target, |
7329 | ptid_t resume_ptid); | |
7330 | ||
c447ac0b PA |
7331 | /* In all-stop mode, if we're currently stepping but have stopped in |
7332 | some other thread, we may need to switch back to the stepped | |
7333 | thread. Returns true we set the inferior running, false if we left | |
7334 | it stopped (and the event needs further processing). */ | |
7335 | ||
c4464ade | 7336 | static bool |
c447ac0b PA |
7337 | switch_back_to_stepped_thread (struct execution_control_state *ecs) |
7338 | { | |
fbea99ea | 7339 | if (!target_is_non_stop_p ()) |
c447ac0b | 7340 | { |
99619bea PA |
7341 | /* If any thread is blocked on some internal breakpoint, and we |
7342 | simply need to step over that breakpoint to get it going | |
7343 | again, do that first. */ | |
7344 | ||
7345 | /* However, if we see an event for the stepping thread, then we | |
7346 | know all other threads have been moved past their breakpoints | |
7347 | already. Let the caller check whether the step is finished, | |
7348 | etc., before deciding to move it past a breakpoint. */ | |
7349 | if (ecs->event_thread->control.step_range_end != 0) | |
c4464ade | 7350 | return false; |
99619bea PA |
7351 | |
7352 | /* Check if the current thread is blocked on an incomplete | |
7353 | step-over, interrupted by a random signal. */ | |
7354 | if (ecs->event_thread->control.trap_expected | |
7355 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7356 | { |
1eb8556f SM |
7357 | infrun_debug_printf |
7358 | ("need to finish step-over of [%s]", | |
7359 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
99619bea | 7360 | keep_going (ecs); |
c4464ade | 7361 | return true; |
99619bea | 7362 | } |
2adfaa28 | 7363 | |
99619bea PA |
7364 | /* Check if the current thread is blocked by a single-step |
7365 | breakpoint of another thread. */ | |
7366 | if (ecs->hit_singlestep_breakpoint) | |
7367 | { | |
1eb8556f SM |
7368 | infrun_debug_printf ("need to step [%s] over single-step breakpoint", |
7369 | target_pid_to_str (ecs->ptid).c_str ()); | |
99619bea | 7370 | keep_going (ecs); |
c4464ade | 7371 | return true; |
99619bea PA |
7372 | } |
7373 | ||
4d9d9d04 PA |
7374 | /* If this thread needs yet another step-over (e.g., stepping |
7375 | through a delay slot), do it first before moving on to | |
7376 | another thread. */ | |
7377 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7378 | { | |
1eb8556f SM |
7379 | infrun_debug_printf |
7380 | ("thread [%s] still needs step-over", | |
7381 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
4d9d9d04 | 7382 | keep_going (ecs); |
c4464ade | 7383 | return true; |
4d9d9d04 | 7384 | } |
70509625 | 7385 | |
483805cf PA |
7386 | /* If scheduler locking applies even if not stepping, there's no |
7387 | need to walk over threads. Above we've checked whether the | |
7388 | current thread is stepping. If some other thread not the | |
7389 | event thread is stepping, then it must be that scheduler | |
7390 | locking is not in effect. */ | |
856e7dd6 | 7391 | if (schedlock_applies (ecs->event_thread)) |
c4464ade | 7392 | return false; |
483805cf | 7393 | |
4d9d9d04 PA |
7394 | /* Otherwise, we no longer expect a trap in the current thread. |
7395 | Clear the trap_expected flag before switching back -- this is | |
7396 | what keep_going does as well, if we call it. */ | |
7397 | ecs->event_thread->control.trap_expected = 0; | |
7398 | ||
7399 | /* Likewise, clear the signal if it should not be passed. */ | |
7400 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7401 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7402 | ||
408f6686 | 7403 | if (restart_stepped_thread (ecs->target, ecs->ptid)) |
4d9d9d04 PA |
7404 | { |
7405 | prepare_to_wait (ecs); | |
c4464ade | 7406 | return true; |
4d9d9d04 PA |
7407 | } |
7408 | ||
408f6686 PA |
7409 | switch_to_thread (ecs->event_thread); |
7410 | } | |
4d9d9d04 | 7411 | |
408f6686 PA |
7412 | return false; |
7413 | } | |
f3f8ece4 | 7414 | |
408f6686 PA |
7415 | /* Look for the thread that was stepping, and resume it. |
7416 | RESUME_TARGET / RESUME_PTID indicate the set of threads the caller | |
7417 | is resuming. Return true if a thread was started, false | |
7418 | otherwise. */ | |
483805cf | 7419 | |
408f6686 PA |
7420 | static bool |
7421 | restart_stepped_thread (process_stratum_target *resume_target, | |
7422 | ptid_t resume_ptid) | |
7423 | { | |
7424 | /* Do all pending step-overs before actually proceeding with | |
7425 | step/next/etc. */ | |
7426 | if (start_step_over ()) | |
7427 | return true; | |
483805cf | 7428 | |
408f6686 PA |
7429 | for (thread_info *tp : all_threads_safe ()) |
7430 | { | |
7431 | if (tp->state == THREAD_EXITED) | |
7432 | continue; | |
7433 | ||
7434 | if (tp->suspend.waitstatus_pending_p) | |
7435 | continue; | |
483805cf | 7436 | |
408f6686 PA |
7437 | /* Ignore threads of processes the caller is not |
7438 | resuming. */ | |
7439 | if (!sched_multi | |
7440 | && (tp->inf->process_target () != resume_target | |
7441 | || tp->inf->pid != resume_ptid.pid ())) | |
7442 | continue; | |
483805cf | 7443 | |
408f6686 PA |
7444 | if (tp->control.trap_expected) |
7445 | { | |
7446 | infrun_debug_printf ("switching back to stepped thread (step-over)"); | |
483805cf | 7447 | |
408f6686 PA |
7448 | if (keep_going_stepped_thread (tp)) |
7449 | return true; | |
99619bea | 7450 | } |
408f6686 PA |
7451 | } |
7452 | ||
7453 | for (thread_info *tp : all_threads_safe ()) | |
7454 | { | |
7455 | if (tp->state == THREAD_EXITED) | |
7456 | continue; | |
7457 | ||
7458 | if (tp->suspend.waitstatus_pending_p) | |
7459 | continue; | |
99619bea | 7460 | |
408f6686 PA |
7461 | /* Ignore threads of processes the caller is not |
7462 | resuming. */ | |
7463 | if (!sched_multi | |
7464 | && (tp->inf->process_target () != resume_target | |
7465 | || tp->inf->pid != resume_ptid.pid ())) | |
7466 | continue; | |
7467 | ||
7468 | /* Did we find the stepping thread? */ | |
7469 | if (tp->control.step_range_end) | |
99619bea | 7470 | { |
408f6686 | 7471 | infrun_debug_printf ("switching back to stepped thread (stepping)"); |
c447ac0b | 7472 | |
408f6686 PA |
7473 | if (keep_going_stepped_thread (tp)) |
7474 | return true; | |
2ac7589c PA |
7475 | } |
7476 | } | |
2adfaa28 | 7477 | |
c4464ade | 7478 | return false; |
2ac7589c | 7479 | } |
2adfaa28 | 7480 | |
408f6686 PA |
7481 | /* See infrun.h. */ |
7482 | ||
7483 | void | |
7484 | restart_after_all_stop_detach (process_stratum_target *proc_target) | |
7485 | { | |
7486 | /* Note we don't check target_is_non_stop_p() here, because the | |
7487 | current inferior may no longer have a process_stratum target | |
7488 | pushed, as we just detached. */ | |
7489 | ||
7490 | /* See if we have a THREAD_RUNNING thread that need to be | |
7491 | re-resumed. If we have any thread that is already executing, | |
7492 | then we don't need to resume the target -- it is already been | |
7493 | resumed. With the remote target (in all-stop), it's even | |
7494 | impossible to issue another resumption if the target is already | |
7495 | resumed, until the target reports a stop. */ | |
7496 | for (thread_info *thr : all_threads (proc_target)) | |
7497 | { | |
7498 | if (thr->state != THREAD_RUNNING) | |
7499 | continue; | |
7500 | ||
7501 | /* If we have any thread that is already executing, then we | |
7502 | don't need to resume the target -- it is already been | |
7503 | resumed. */ | |
7504 | if (thr->executing) | |
7505 | return; | |
7506 | ||
7507 | /* If we have a pending event to process, skip resuming the | |
7508 | target and go straight to processing it. */ | |
7509 | if (thr->resumed && thr->suspend.waitstatus_pending_p) | |
7510 | return; | |
7511 | } | |
7512 | ||
7513 | /* Alright, we need to re-resume the target. If a thread was | |
7514 | stepping, we need to restart it stepping. */ | |
7515 | if (restart_stepped_thread (proc_target, minus_one_ptid)) | |
7516 | return; | |
7517 | ||
7518 | /* Otherwise, find the first THREAD_RUNNING thread and resume | |
7519 | it. */ | |
7520 | for (thread_info *thr : all_threads (proc_target)) | |
7521 | { | |
7522 | if (thr->state != THREAD_RUNNING) | |
7523 | continue; | |
7524 | ||
7525 | execution_control_state ecs; | |
7526 | reset_ecs (&ecs, thr); | |
7527 | switch_to_thread (thr); | |
7528 | keep_going (&ecs); | |
7529 | return; | |
7530 | } | |
7531 | } | |
7532 | ||
2ac7589c PA |
7533 | /* Set a previously stepped thread back to stepping. Returns true on |
7534 | success, false if the resume is not possible (e.g., the thread | |
7535 | vanished). */ | |
7536 | ||
c4464ade | 7537 | static bool |
2ac7589c PA |
7538 | keep_going_stepped_thread (struct thread_info *tp) |
7539 | { | |
7540 | struct frame_info *frame; | |
2ac7589c PA |
7541 | struct execution_control_state ecss; |
7542 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7543 | |
2ac7589c PA |
7544 | /* If the stepping thread exited, then don't try to switch back and |
7545 | resume it, which could fail in several different ways depending | |
7546 | on the target. Instead, just keep going. | |
2adfaa28 | 7547 | |
2ac7589c PA |
7548 | We can find a stepping dead thread in the thread list in two |
7549 | cases: | |
2adfaa28 | 7550 | |
2ac7589c PA |
7551 | - The target supports thread exit events, and when the target |
7552 | tries to delete the thread from the thread list, inferior_ptid | |
7553 | pointed at the exiting thread. In such case, calling | |
7554 | delete_thread does not really remove the thread from the list; | |
7555 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7556 | |
2ac7589c PA |
7557 | - The target's debug interface does not support thread exit |
7558 | events, and so we have no idea whatsoever if the previously | |
7559 | stepping thread is still alive. For that reason, we need to | |
7560 | synchronously query the target now. */ | |
2adfaa28 | 7561 | |
00431a78 | 7562 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c | 7563 | { |
1eb8556f SM |
7564 | infrun_debug_printf ("not resuming previously stepped thread, it has " |
7565 | "vanished"); | |
2ac7589c | 7566 | |
00431a78 | 7567 | delete_thread (tp); |
c4464ade | 7568 | return false; |
c447ac0b | 7569 | } |
2ac7589c | 7570 | |
1eb8556f | 7571 | infrun_debug_printf ("resuming previously stepped thread"); |
2ac7589c PA |
7572 | |
7573 | reset_ecs (ecs, tp); | |
00431a78 | 7574 | switch_to_thread (tp); |
2ac7589c | 7575 | |
f2ffa92b | 7576 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 7577 | frame = get_current_frame (); |
2ac7589c PA |
7578 | |
7579 | /* If the PC of the thread we were trying to single-step has | |
7580 | changed, then that thread has trapped or been signaled, but the | |
7581 | event has not been reported to GDB yet. Re-poll the target | |
7582 | looking for this particular thread's event (i.e. temporarily | |
7583 | enable schedlock) by: | |
7584 | ||
7585 | - setting a break at the current PC | |
7586 | - resuming that particular thread, only (by setting trap | |
7587 | expected) | |
7588 | ||
7589 | This prevents us continuously moving the single-step breakpoint | |
7590 | forward, one instruction at a time, overstepping. */ | |
7591 | ||
f2ffa92b | 7592 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
7593 | { |
7594 | ptid_t resume_ptid; | |
7595 | ||
1eb8556f SM |
7596 | infrun_debug_printf ("expected thread advanced also (%s -> %s)", |
7597 | paddress (target_gdbarch (), tp->prev_pc), | |
7598 | paddress (target_gdbarch (), tp->suspend.stop_pc)); | |
2ac7589c PA |
7599 | |
7600 | /* Clear the info of the previous step-over, as it's no longer | |
7601 | valid (if the thread was trying to step over a breakpoint, it | |
7602 | has already succeeded). It's what keep_going would do too, | |
7603 | if we called it. Do this before trying to insert the sss | |
7604 | breakpoint, otherwise if we were previously trying to step | |
7605 | over this exact address in another thread, the breakpoint is | |
7606 | skipped. */ | |
7607 | clear_step_over_info (); | |
7608 | tp->control.trap_expected = 0; | |
7609 | ||
7610 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7611 | get_frame_address_space (frame), | |
f2ffa92b | 7612 | tp->suspend.stop_pc); |
2ac7589c | 7613 | |
719546c4 | 7614 | tp->resumed = true; |
fbea99ea | 7615 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
c4464ade | 7616 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
2ac7589c PA |
7617 | } |
7618 | else | |
7619 | { | |
1eb8556f | 7620 | infrun_debug_printf ("expected thread still hasn't advanced"); |
2ac7589c PA |
7621 | |
7622 | keep_going_pass_signal (ecs); | |
7623 | } | |
c4464ade SM |
7624 | |
7625 | return true; | |
c447ac0b PA |
7626 | } |
7627 | ||
8b061563 PA |
7628 | /* Is thread TP in the middle of (software or hardware) |
7629 | single-stepping? (Note the result of this function must never be | |
7630 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7631 | |
c4464ade | 7632 | static bool |
b3444185 | 7633 | currently_stepping (struct thread_info *tp) |
a7212384 | 7634 | { |
8358c15c JK |
7635 | return ((tp->control.step_range_end |
7636 | && tp->control.step_resume_breakpoint == NULL) | |
7637 | || tp->control.trap_expected | |
af48d08f | 7638 | || tp->stepped_breakpoint |
8358c15c | 7639 | || bpstat_should_step ()); |
a7212384 UW |
7640 | } |
7641 | ||
b2175913 MS |
7642 | /* Inferior has stepped into a subroutine call with source code that |
7643 | we should not step over. Do step to the first line of code in | |
7644 | it. */ | |
c2c6d25f JM |
7645 | |
7646 | static void | |
568d6575 UW |
7647 | handle_step_into_function (struct gdbarch *gdbarch, |
7648 | struct execution_control_state *ecs) | |
c2c6d25f | 7649 | { |
7e324e48 GB |
7650 | fill_in_stop_func (gdbarch, ecs); |
7651 | ||
f2ffa92b PA |
7652 | compunit_symtab *cust |
7653 | = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); | |
43f3e411 | 7654 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7655 | ecs->stop_func_start |
7656 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7657 | |
51abb421 | 7658 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7659 | /* Use the step_resume_break to step until the end of the prologue, |
7660 | even if that involves jumps (as it seems to on the vax under | |
7661 | 4.2). */ | |
7662 | /* If the prologue ends in the middle of a source line, continue to | |
7663 | the end of that source line (if it is still within the function). | |
7664 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7665 | if (stop_func_sal.end |
7666 | && stop_func_sal.pc != ecs->stop_func_start | |
7667 | && stop_func_sal.end < ecs->stop_func_end) | |
7668 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7669 | |
2dbd5e30 KB |
7670 | /* Architectures which require breakpoint adjustment might not be able |
7671 | to place a breakpoint at the computed address. If so, the test | |
7672 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7673 | ecs->stop_func_start to an address at which a breakpoint may be | |
7674 | legitimately placed. | |
8fb3e588 | 7675 | |
2dbd5e30 KB |
7676 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7677 | made, GDB will enter an infinite loop when stepping through | |
7678 | optimized code consisting of VLIW instructions which contain | |
7679 | subinstructions corresponding to different source lines. On | |
7680 | FR-V, it's not permitted to place a breakpoint on any but the | |
7681 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7682 | set, GDB will adjust the breakpoint address to the beginning of | |
7683 | the VLIW instruction. Thus, we need to make the corresponding | |
7684 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7685 | |
568d6575 | 7686 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7687 | { |
7688 | ecs->stop_func_start | |
568d6575 | 7689 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7690 | ecs->stop_func_start); |
2dbd5e30 KB |
7691 | } |
7692 | ||
f2ffa92b | 7693 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7694 | { |
7695 | /* We are already there: stop now. */ | |
bdc36728 | 7696 | end_stepping_range (ecs); |
c2c6d25f JM |
7697 | return; |
7698 | } | |
7699 | else | |
7700 | { | |
7701 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7702 | symtab_and_line sr_sal; |
c2c6d25f JM |
7703 | sr_sal.pc = ecs->stop_func_start; |
7704 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7705 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7706 | |
c2c6d25f | 7707 | /* Do not specify what the fp should be when we stop since on |
dda83cd7 SM |
7708 | some machines the prologue is where the new fp value is |
7709 | established. */ | |
a6d9a66e | 7710 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7711 | |
7712 | /* And make sure stepping stops right away then. */ | |
16c381f0 | 7713 | ecs->event_thread->control.step_range_end |
dda83cd7 | 7714 | = ecs->event_thread->control.step_range_start; |
c2c6d25f JM |
7715 | } |
7716 | keep_going (ecs); | |
7717 | } | |
d4f3574e | 7718 | |
b2175913 MS |
7719 | /* Inferior has stepped backward into a subroutine call with source |
7720 | code that we should not step over. Do step to the beginning of the | |
7721 | last line of code in it. */ | |
7722 | ||
7723 | static void | |
568d6575 UW |
7724 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7725 | struct execution_control_state *ecs) | |
b2175913 | 7726 | { |
43f3e411 | 7727 | struct compunit_symtab *cust; |
167e4384 | 7728 | struct symtab_and_line stop_func_sal; |
b2175913 | 7729 | |
7e324e48 GB |
7730 | fill_in_stop_func (gdbarch, ecs); |
7731 | ||
f2ffa92b | 7732 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7733 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7734 | ecs->stop_func_start |
7735 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7736 | |
f2ffa92b | 7737 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7738 | |
7739 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7740 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7741 | { |
7742 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7743 | end_stepping_range (ecs); |
b2175913 MS |
7744 | } |
7745 | else | |
7746 | { | |
7747 | /* Else just reset the step range and keep going. | |
7748 | No step-resume breakpoint, they don't work for | |
7749 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7750 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7751 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7752 | keep_going (ecs); |
7753 | } | |
7754 | return; | |
7755 | } | |
7756 | ||
d3169d93 | 7757 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7758 | This is used to both functions and to skip over code. */ |
7759 | ||
7760 | static void | |
2c03e5be PA |
7761 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7762 | struct symtab_and_line sr_sal, | |
7763 | struct frame_id sr_id, | |
7764 | enum bptype sr_type) | |
44cbf7b5 | 7765 | { |
611c83ae PA |
7766 | /* There should never be more than one step-resume or longjmp-resume |
7767 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7768 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7769 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7770 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 | 7771 | |
1eb8556f SM |
7772 | infrun_debug_printf ("inserting step-resume breakpoint at %s", |
7773 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7774 | |
8358c15c | 7775 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7776 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7777 | } |
7778 | ||
9da8c2a0 | 7779 | void |
2c03e5be PA |
7780 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7781 | struct symtab_and_line sr_sal, | |
7782 | struct frame_id sr_id) | |
7783 | { | |
7784 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7785 | sr_sal, sr_id, | |
7786 | bp_step_resume); | |
44cbf7b5 | 7787 | } |
7ce450bd | 7788 | |
2c03e5be PA |
7789 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7790 | This is used to skip a potential signal handler. | |
7ce450bd | 7791 | |
14e60db5 DJ |
7792 | This is called with the interrupted function's frame. The signal |
7793 | handler, when it returns, will resume the interrupted function at | |
7794 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7795 | |
7796 | static void | |
2c03e5be | 7797 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7798 | { |
f4c1edd8 | 7799 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7800 | |
51abb421 PA |
7801 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7802 | ||
7803 | symtab_and_line sr_sal; | |
568d6575 | 7804 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7805 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7806 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7807 | |
2c03e5be PA |
7808 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7809 | get_stack_frame_id (return_frame), | |
7810 | bp_hp_step_resume); | |
d303a6c7 AC |
7811 | } |
7812 | ||
2c03e5be PA |
7813 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7814 | is used to skip a function after stepping into it (for "next" or if | |
7815 | the called function has no debugging information). | |
14e60db5 DJ |
7816 | |
7817 | The current function has almost always been reached by single | |
7818 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7819 | current function, and the breakpoint will be set at the caller's | |
7820 | resume address. | |
7821 | ||
7822 | This is a separate function rather than reusing | |
2c03e5be | 7823 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7824 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7825 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7826 | |
7827 | static void | |
7828 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7829 | { | |
14e60db5 DJ |
7830 | /* We shouldn't have gotten here if we don't know where the call site |
7831 | is. */ | |
c7ce8faa | 7832 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7833 | |
51abb421 | 7834 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7835 | |
51abb421 | 7836 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7837 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7838 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7839 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7840 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7841 | |
a6d9a66e | 7842 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7843 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7844 | } |
7845 | ||
611c83ae PA |
7846 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7847 | new breakpoint at the target of a jmp_buf. The handling of | |
7848 | longjmp-resume uses the same mechanisms used for handling | |
7849 | "step-resume" breakpoints. */ | |
7850 | ||
7851 | static void | |
a6d9a66e | 7852 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7853 | { |
e81a37f7 TT |
7854 | /* There should never be more than one longjmp-resume breakpoint per |
7855 | thread, so we should never be setting a new | |
611c83ae | 7856 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7857 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae | 7858 | |
1eb8556f SM |
7859 | infrun_debug_printf ("inserting longjmp-resume breakpoint at %s", |
7860 | paddress (gdbarch, pc)); | |
611c83ae | 7861 | |
e81a37f7 | 7862 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7863 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7864 | } |
7865 | ||
186c406b TT |
7866 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7867 | the exception. The block B is the block of the unwinder debug hook | |
7868 | function. FRAME is the frame corresponding to the call to this | |
7869 | function. SYM is the symbol of the function argument holding the | |
7870 | target PC of the exception. */ | |
7871 | ||
7872 | static void | |
7873 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7874 | const struct block *b, |
186c406b TT |
7875 | struct frame_info *frame, |
7876 | struct symbol *sym) | |
7877 | { | |
a70b8144 | 7878 | try |
186c406b | 7879 | { |
63e43d3a | 7880 | struct block_symbol vsym; |
186c406b TT |
7881 | struct value *value; |
7882 | CORE_ADDR handler; | |
7883 | struct breakpoint *bp; | |
7884 | ||
987012b8 | 7885 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 7886 | b, VAR_DOMAIN); |
63e43d3a | 7887 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7888 | /* If the value was optimized out, revert to the old behavior. */ |
7889 | if (! value_optimized_out (value)) | |
7890 | { | |
7891 | handler = value_as_address (value); | |
7892 | ||
1eb8556f SM |
7893 | infrun_debug_printf ("exception resume at %lx", |
7894 | (unsigned long) handler); | |
186c406b TT |
7895 | |
7896 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7897 | handler, |
7898 | bp_exception_resume).release (); | |
c70a6932 JK |
7899 | |
7900 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7901 | frame = NULL; | |
7902 | ||
5d5658a1 | 7903 | bp->thread = tp->global_num; |
186c406b TT |
7904 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7905 | } | |
7906 | } | |
230d2906 | 7907 | catch (const gdb_exception_error &e) |
492d29ea PA |
7908 | { |
7909 | /* We want to ignore errors here. */ | |
7910 | } | |
186c406b TT |
7911 | } |
7912 | ||
28106bc2 SDJ |
7913 | /* A helper for check_exception_resume that sets an |
7914 | exception-breakpoint based on a SystemTap probe. */ | |
7915 | ||
7916 | static void | |
7917 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7918 | const struct bound_probe *probe, |
28106bc2 SDJ |
7919 | struct frame_info *frame) |
7920 | { | |
7921 | struct value *arg_value; | |
7922 | CORE_ADDR handler; | |
7923 | struct breakpoint *bp; | |
7924 | ||
7925 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7926 | if (!arg_value) | |
7927 | return; | |
7928 | ||
7929 | handler = value_as_address (arg_value); | |
7930 | ||
1eb8556f SM |
7931 | infrun_debug_printf ("exception resume at %s", |
7932 | paddress (probe->objfile->arch (), handler)); | |
28106bc2 SDJ |
7933 | |
7934 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7935 | handler, bp_exception_resume).release (); |
5d5658a1 | 7936 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7937 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7938 | } | |
7939 | ||
186c406b TT |
7940 | /* This is called when an exception has been intercepted. Check to |
7941 | see whether the exception's destination is of interest, and if so, | |
7942 | set an exception resume breakpoint there. */ | |
7943 | ||
7944 | static void | |
7945 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7946 | struct frame_info *frame) |
186c406b | 7947 | { |
729662a5 | 7948 | struct bound_probe probe; |
28106bc2 SDJ |
7949 | struct symbol *func; |
7950 | ||
7951 | /* First see if this exception unwinding breakpoint was set via a | |
7952 | SystemTap probe point. If so, the probe has two arguments: the | |
7953 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7954 | set a breakpoint there. */ | |
6bac7473 | 7955 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7956 | if (probe.prob) |
28106bc2 | 7957 | { |
729662a5 | 7958 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7959 | return; |
7960 | } | |
7961 | ||
7962 | func = get_frame_function (frame); | |
7963 | if (!func) | |
7964 | return; | |
186c406b | 7965 | |
a70b8144 | 7966 | try |
186c406b | 7967 | { |
3977b71f | 7968 | const struct block *b; |
8157b174 | 7969 | struct block_iterator iter; |
186c406b TT |
7970 | struct symbol *sym; |
7971 | int argno = 0; | |
7972 | ||
7973 | /* The exception breakpoint is a thread-specific breakpoint on | |
7974 | the unwinder's debug hook, declared as: | |
7975 | ||
7976 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7977 | ||
7978 | The CFA argument indicates the frame to which control is | |
7979 | about to be transferred. HANDLER is the destination PC. | |
7980 | ||
7981 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7982 | This is not extremely efficient but it avoids issues in gdb | |
7983 | with computing the DWARF CFA, and it also works even in weird | |
7984 | cases such as throwing an exception from inside a signal | |
7985 | handler. */ | |
7986 | ||
7987 | b = SYMBOL_BLOCK_VALUE (func); | |
7988 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7989 | { | |
7990 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7991 | continue; | |
7992 | ||
7993 | if (argno == 0) | |
7994 | ++argno; | |
7995 | else | |
7996 | { | |
7997 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7998 | b, frame, sym); | |
7999 | break; | |
8000 | } | |
8001 | } | |
8002 | } | |
230d2906 | 8003 | catch (const gdb_exception_error &e) |
492d29ea PA |
8004 | { |
8005 | } | |
186c406b TT |
8006 | } |
8007 | ||
104c1213 | 8008 | static void |
22bcd14b | 8009 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 8010 | { |
1eb8556f | 8011 | infrun_debug_printf ("stop_waiting"); |
527159b7 | 8012 | |
cd0fc7c3 SS |
8013 | /* Let callers know we don't want to wait for the inferior anymore. */ |
8014 | ecs->wait_some_more = 0; | |
fbea99ea | 8015 | |
53cccef1 | 8016 | /* If all-stop, but there exists a non-stop target, stop all |
fbea99ea | 8017 | threads now that we're presenting the stop to the user. */ |
53cccef1 | 8018 | if (!non_stop && exists_non_stop_target ()) |
fbea99ea | 8019 | stop_all_threads (); |
cd0fc7c3 SS |
8020 | } |
8021 | ||
4d9d9d04 PA |
8022 | /* Like keep_going, but passes the signal to the inferior, even if the |
8023 | signal is set to nopass. */ | |
d4f3574e SS |
8024 | |
8025 | static void | |
4d9d9d04 | 8026 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 8027 | { |
d7e15655 | 8028 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 8029 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 8030 | |
d4f3574e | 8031 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 8032 | ecs->event_thread->prev_pc |
fc75c28b | 8033 | = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 8034 | |
4d9d9d04 | 8035 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 8036 | { |
4d9d9d04 PA |
8037 | struct thread_info *tp = ecs->event_thread; |
8038 | ||
1eb8556f SM |
8039 | infrun_debug_printf ("%s has trap_expected set, " |
8040 | "resuming to collect trap", | |
8041 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 | 8042 | |
a9ba6bae PA |
8043 | /* We haven't yet gotten our trap, and either: intercepted a |
8044 | non-signal event (e.g., a fork); or took a signal which we | |
8045 | are supposed to pass through to the inferior. Simply | |
8046 | continue. */ | |
64ce06e4 | 8047 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 8048 | } |
372316f1 PA |
8049 | else if (step_over_info_valid_p ()) |
8050 | { | |
8051 | /* Another thread is stepping over a breakpoint in-line. If | |
8052 | this thread needs a step-over too, queue the request. In | |
8053 | either case, this resume must be deferred for later. */ | |
8054 | struct thread_info *tp = ecs->event_thread; | |
8055 | ||
8056 | if (ecs->hit_singlestep_breakpoint | |
8057 | || thread_still_needs_step_over (tp)) | |
8058 | { | |
1eb8556f SM |
8059 | infrun_debug_printf ("step-over already in progress: " |
8060 | "step-over for %s deferred", | |
8061 | target_pid_to_str (tp->ptid).c_str ()); | |
28d5518b | 8062 | global_thread_step_over_chain_enqueue (tp); |
372316f1 PA |
8063 | } |
8064 | else | |
8065 | { | |
1eb8556f SM |
8066 | infrun_debug_printf ("step-over in progress: resume of %s deferred", |
8067 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 8068 | } |
372316f1 | 8069 | } |
d4f3574e SS |
8070 | else |
8071 | { | |
31e77af2 | 8072 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
8073 | int remove_bp; |
8074 | int remove_wps; | |
8d297bbf | 8075 | step_over_what step_what; |
31e77af2 | 8076 | |
d4f3574e | 8077 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
8078 | anyway (if we got a signal, the user asked it be passed to |
8079 | the child) | |
8080 | -- or -- | |
8081 | We got our expected trap, but decided we should resume from | |
8082 | it. | |
d4f3574e | 8083 | |
a9ba6bae | 8084 | We're going to run this baby now! |
d4f3574e | 8085 | |
c36b740a VP |
8086 | Note that insert_breakpoints won't try to re-insert |
8087 | already inserted breakpoints. Therefore, we don't | |
8088 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 8089 | |
31e77af2 PA |
8090 | /* If we need to step over a breakpoint, and we're not using |
8091 | displaced stepping to do so, insert all breakpoints | |
8092 | (watchpoints, etc.) but the one we're stepping over, step one | |
8093 | instruction, and then re-insert the breakpoint when that step | |
8094 | is finished. */ | |
963f9c80 | 8095 | |
6c4cfb24 PA |
8096 | step_what = thread_still_needs_step_over (ecs->event_thread); |
8097 | ||
963f9c80 | 8098 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
8099 | || (step_what & STEP_OVER_BREAKPOINT)); |
8100 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 8101 | |
cb71640d PA |
8102 | /* We can't use displaced stepping if we need to step past a |
8103 | watchpoint. The instruction copied to the scratch pad would | |
8104 | still trigger the watchpoint. */ | |
8105 | if (remove_bp | |
3fc8eb30 | 8106 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 8107 | { |
a01bda52 | 8108 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
8109 | regcache_read_pc (regcache), remove_wps, |
8110 | ecs->event_thread->global_num); | |
45e8c884 | 8111 | } |
963f9c80 | 8112 | else if (remove_wps) |
21edc42f | 8113 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
8114 | |
8115 | /* If we now need to do an in-line step-over, we need to stop | |
8116 | all other threads. Note this must be done before | |
8117 | insert_breakpoints below, because that removes the breakpoint | |
8118 | we're about to step over, otherwise other threads could miss | |
8119 | it. */ | |
fbea99ea | 8120 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 8121 | stop_all_threads (); |
abbb1732 | 8122 | |
31e77af2 | 8123 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 8124 | try |
31e77af2 PA |
8125 | { |
8126 | insert_breakpoints (); | |
8127 | } | |
230d2906 | 8128 | catch (const gdb_exception_error &e) |
31e77af2 PA |
8129 | { |
8130 | exception_print (gdb_stderr, e); | |
22bcd14b | 8131 | stop_waiting (ecs); |
bdf2a94a | 8132 | clear_step_over_info (); |
31e77af2 | 8133 | return; |
d4f3574e SS |
8134 | } |
8135 | ||
963f9c80 | 8136 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 8137 | |
64ce06e4 | 8138 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
8139 | } |
8140 | ||
488f131b | 8141 | prepare_to_wait (ecs); |
d4f3574e SS |
8142 | } |
8143 | ||
4d9d9d04 PA |
8144 | /* Called when we should continue running the inferior, because the |
8145 | current event doesn't cause a user visible stop. This does the | |
8146 | resuming part; waiting for the next event is done elsewhere. */ | |
8147 | ||
8148 | static void | |
8149 | keep_going (struct execution_control_state *ecs) | |
8150 | { | |
8151 | if (ecs->event_thread->control.trap_expected | |
8152 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
8153 | ecs->event_thread->control.trap_expected = 0; | |
8154 | ||
8155 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
8156 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
8157 | keep_going_pass_signal (ecs); | |
8158 | } | |
8159 | ||
104c1213 JM |
8160 | /* This function normally comes after a resume, before |
8161 | handle_inferior_event exits. It takes care of any last bits of | |
8162 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 8163 | |
104c1213 JM |
8164 | static void |
8165 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 8166 | { |
1eb8556f | 8167 | infrun_debug_printf ("prepare_to_wait"); |
104c1213 | 8168 | |
104c1213 | 8169 | ecs->wait_some_more = 1; |
0b333c5e | 8170 | |
42bd97a6 PA |
8171 | /* If the target can't async, emulate it by marking the infrun event |
8172 | handler such that as soon as we get back to the event-loop, we | |
8173 | immediately end up in fetch_inferior_event again calling | |
8174 | target_wait. */ | |
8175 | if (!target_can_async_p ()) | |
0b333c5e | 8176 | mark_infrun_async_event_handler (); |
c906108c | 8177 | } |
11cf8741 | 8178 | |
fd664c91 | 8179 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 8180 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
8181 | |
8182 | static void | |
bdc36728 | 8183 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 8184 | { |
bdc36728 | 8185 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 8186 | stop_waiting (ecs); |
fd664c91 PA |
8187 | } |
8188 | ||
33d62d64 JK |
8189 | /* Several print_*_reason functions to print why the inferior has stopped. |
8190 | We always print something when the inferior exits, or receives a signal. | |
8191 | The rest of the cases are dealt with later on in normal_stop and | |
8192 | print_it_typical. Ideally there should be a call to one of these | |
8193 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 8194 | stop_waiting is called. |
33d62d64 | 8195 | |
fd664c91 PA |
8196 | Note that we don't call these directly, instead we delegate that to |
8197 | the interpreters, through observers. Interpreters then call these | |
8198 | with whatever uiout is right. */ | |
33d62d64 | 8199 | |
fd664c91 PA |
8200 | void |
8201 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 8202 | { |
fd664c91 | 8203 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 8204 | |
112e8700 | 8205 | if (uiout->is_mi_like_p ()) |
fd664c91 | 8206 | { |
112e8700 | 8207 | uiout->field_string ("reason", |
fd664c91 PA |
8208 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
8209 | } | |
8210 | } | |
33d62d64 | 8211 | |
fd664c91 PA |
8212 | void |
8213 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 8214 | { |
33d62d64 | 8215 | annotate_signalled (); |
112e8700 SM |
8216 | if (uiout->is_mi_like_p ()) |
8217 | uiout->field_string | |
8218 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8219 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 8220 | annotate_signal_name (); |
112e8700 | 8221 | uiout->field_string ("signal-name", |
2ea28649 | 8222 | gdb_signal_to_name (siggnal)); |
33d62d64 | 8223 | annotate_signal_name_end (); |
112e8700 | 8224 | uiout->text (", "); |
33d62d64 | 8225 | annotate_signal_string (); |
112e8700 | 8226 | uiout->field_string ("signal-meaning", |
2ea28649 | 8227 | gdb_signal_to_string (siggnal)); |
33d62d64 | 8228 | annotate_signal_string_end (); |
112e8700 SM |
8229 | uiout->text (".\n"); |
8230 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
8231 | } |
8232 | ||
fd664c91 PA |
8233 | void |
8234 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 8235 | { |
fda326dd | 8236 | struct inferior *inf = current_inferior (); |
a068643d | 8237 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 8238 | |
33d62d64 JK |
8239 | annotate_exited (exitstatus); |
8240 | if (exitstatus) | |
8241 | { | |
112e8700 SM |
8242 | if (uiout->is_mi_like_p ()) |
8243 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
8244 | std::string exit_code_str |
8245 | = string_printf ("0%o", (unsigned int) exitstatus); | |
8246 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
8247 | plongest (inf->num), pidstr.c_str (), | |
8248 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
8249 | } |
8250 | else | |
11cf8741 | 8251 | { |
112e8700 SM |
8252 | if (uiout->is_mi_like_p ()) |
8253 | uiout->field_string | |
8254 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
8255 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
8256 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 8257 | } |
33d62d64 JK |
8258 | } |
8259 | ||
fd664c91 PA |
8260 | void |
8261 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 8262 | { |
f303dbd6 PA |
8263 | struct thread_info *thr = inferior_thread (); |
8264 | ||
33d62d64 JK |
8265 | annotate_signal (); |
8266 | ||
112e8700 | 8267 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
8268 | ; |
8269 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 8270 | { |
f303dbd6 | 8271 | const char *name; |
33d62d64 | 8272 | |
112e8700 | 8273 | uiout->text ("\nThread "); |
33eca680 | 8274 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 PA |
8275 | |
8276 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
8277 | if (name != NULL) | |
8278 | { | |
112e8700 | 8279 | uiout->text (" \""); |
33eca680 | 8280 | uiout->field_string ("name", name); |
112e8700 | 8281 | uiout->text ("\""); |
f303dbd6 | 8282 | } |
33d62d64 | 8283 | } |
f303dbd6 | 8284 | else |
112e8700 | 8285 | uiout->text ("\nProgram"); |
f303dbd6 | 8286 | |
112e8700 SM |
8287 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8288 | uiout->text (" stopped"); | |
33d62d64 JK |
8289 | else |
8290 | { | |
112e8700 | 8291 | uiout->text (" received signal "); |
8b93c638 | 8292 | annotate_signal_name (); |
112e8700 SM |
8293 | if (uiout->is_mi_like_p ()) |
8294 | uiout->field_string | |
8295 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8296 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8297 | annotate_signal_name_end (); |
112e8700 | 8298 | uiout->text (", "); |
8b93c638 | 8299 | annotate_signal_string (); |
112e8700 | 8300 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 | 8301 | |
272bb05c JB |
8302 | struct regcache *regcache = get_current_regcache (); |
8303 | struct gdbarch *gdbarch = regcache->arch (); | |
8304 | if (gdbarch_report_signal_info_p (gdbarch)) | |
8305 | gdbarch_report_signal_info (gdbarch, uiout, siggnal); | |
8306 | ||
8b93c638 | 8307 | annotate_signal_string_end (); |
33d62d64 | 8308 | } |
112e8700 | 8309 | uiout->text (".\n"); |
33d62d64 | 8310 | } |
252fbfc8 | 8311 | |
fd664c91 PA |
8312 | void |
8313 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8314 | { |
112e8700 | 8315 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8316 | } |
43ff13b4 | 8317 | |
0c7e1a46 PA |
8318 | /* Print current location without a level number, if we have changed |
8319 | functions or hit a breakpoint. Print source line if we have one. | |
8320 | bpstat_print contains the logic deciding in detail what to print, | |
8321 | based on the event(s) that just occurred. */ | |
8322 | ||
243a9253 PA |
8323 | static void |
8324 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8325 | { |
8326 | int bpstat_ret; | |
f486487f | 8327 | enum print_what source_flag; |
0c7e1a46 PA |
8328 | int do_frame_printing = 1; |
8329 | struct thread_info *tp = inferior_thread (); | |
8330 | ||
8331 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8332 | switch (bpstat_ret) | |
8333 | { | |
8334 | case PRINT_UNKNOWN: | |
8335 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8336 | should) carry around the function and does (or should) use | |
8337 | that when doing a frame comparison. */ | |
8338 | if (tp->control.stop_step | |
8339 | && frame_id_eq (tp->control.step_frame_id, | |
8340 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
8341 | && (tp->control.step_start_function |
8342 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
8343 | { |
8344 | /* Finished step, just print source line. */ | |
8345 | source_flag = SRC_LINE; | |
8346 | } | |
8347 | else | |
8348 | { | |
8349 | /* Print location and source line. */ | |
8350 | source_flag = SRC_AND_LOC; | |
8351 | } | |
8352 | break; | |
8353 | case PRINT_SRC_AND_LOC: | |
8354 | /* Print location and source line. */ | |
8355 | source_flag = SRC_AND_LOC; | |
8356 | break; | |
8357 | case PRINT_SRC_ONLY: | |
8358 | source_flag = SRC_LINE; | |
8359 | break; | |
8360 | case PRINT_NOTHING: | |
8361 | /* Something bogus. */ | |
8362 | source_flag = SRC_LINE; | |
8363 | do_frame_printing = 0; | |
8364 | break; | |
8365 | default: | |
8366 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8367 | } | |
8368 | ||
8369 | /* The behavior of this routine with respect to the source | |
8370 | flag is: | |
8371 | SRC_LINE: Print only source line | |
8372 | LOCATION: Print only location | |
8373 | SRC_AND_LOC: Print location and source line. */ | |
8374 | if (do_frame_printing) | |
8375 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8376 | } |
8377 | ||
243a9253 PA |
8378 | /* See infrun.h. */ |
8379 | ||
8380 | void | |
4c7d57e7 | 8381 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8382 | { |
243a9253 | 8383 | struct target_waitstatus last; |
243a9253 PA |
8384 | struct thread_info *tp; |
8385 | ||
5b6d1e4f | 8386 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8387 | |
67ad9399 TT |
8388 | { |
8389 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8390 | |
67ad9399 | 8391 | print_stop_location (&last); |
243a9253 | 8392 | |
67ad9399 | 8393 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8394 | if (displays) |
8395 | do_displays (); | |
67ad9399 | 8396 | } |
243a9253 PA |
8397 | |
8398 | tp = inferior_thread (); | |
8399 | if (tp->thread_fsm != NULL | |
46e3ed7f | 8400 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
8401 | { |
8402 | struct return_value_info *rv; | |
8403 | ||
46e3ed7f | 8404 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
8405 | if (rv != NULL) |
8406 | print_return_value (uiout, rv); | |
8407 | } | |
0c7e1a46 PA |
8408 | } |
8409 | ||
388a7084 PA |
8410 | /* See infrun.h. */ |
8411 | ||
8412 | void | |
8413 | maybe_remove_breakpoints (void) | |
8414 | { | |
55f6301a | 8415 | if (!breakpoints_should_be_inserted_now () && target_has_execution ()) |
388a7084 PA |
8416 | { |
8417 | if (remove_breakpoints ()) | |
8418 | { | |
223ffa71 | 8419 | target_terminal::ours_for_output (); |
388a7084 PA |
8420 | printf_filtered (_("Cannot remove breakpoints because " |
8421 | "program is no longer writable.\nFurther " | |
8422 | "execution is probably impossible.\n")); | |
8423 | } | |
8424 | } | |
8425 | } | |
8426 | ||
4c2f2a79 PA |
8427 | /* The execution context that just caused a normal stop. */ |
8428 | ||
8429 | struct stop_context | |
8430 | { | |
2d844eaf | 8431 | stop_context (); |
2d844eaf TT |
8432 | |
8433 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8434 | ||
8435 | bool changed () const; | |
8436 | ||
4c2f2a79 PA |
8437 | /* The stop ID. */ |
8438 | ULONGEST stop_id; | |
c906108c | 8439 | |
4c2f2a79 | 8440 | /* The event PTID. */ |
c906108c | 8441 | |
4c2f2a79 PA |
8442 | ptid_t ptid; |
8443 | ||
8444 | /* If stopp for a thread event, this is the thread that caused the | |
8445 | stop. */ | |
d634cd0b | 8446 | thread_info_ref thread; |
4c2f2a79 PA |
8447 | |
8448 | /* The inferior that caused the stop. */ | |
8449 | int inf_num; | |
8450 | }; | |
8451 | ||
2d844eaf | 8452 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8453 | takes a strong reference to the thread. */ |
8454 | ||
2d844eaf | 8455 | stop_context::stop_context () |
4c2f2a79 | 8456 | { |
2d844eaf TT |
8457 | stop_id = get_stop_id (); |
8458 | ptid = inferior_ptid; | |
8459 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8460 | |
d7e15655 | 8461 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8462 | { |
8463 | /* Take a strong reference so that the thread can't be deleted | |
8464 | yet. */ | |
d634cd0b | 8465 | thread = thread_info_ref::new_reference (inferior_thread ()); |
4c2f2a79 | 8466 | } |
4c2f2a79 PA |
8467 | } |
8468 | ||
8469 | /* Return true if the current context no longer matches the saved stop | |
8470 | context. */ | |
8471 | ||
2d844eaf TT |
8472 | bool |
8473 | stop_context::changed () const | |
8474 | { | |
8475 | if (ptid != inferior_ptid) | |
8476 | return true; | |
8477 | if (inf_num != current_inferior ()->num) | |
8478 | return true; | |
8479 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8480 | return true; | |
8481 | if (get_stop_id () != stop_id) | |
8482 | return true; | |
8483 | return false; | |
4c2f2a79 PA |
8484 | } |
8485 | ||
8486 | /* See infrun.h. */ | |
8487 | ||
8488 | int | |
96baa820 | 8489 | normal_stop (void) |
c906108c | 8490 | { |
73b65bb0 | 8491 | struct target_waitstatus last; |
73b65bb0 | 8492 | |
5b6d1e4f | 8493 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8494 | |
4c2f2a79 PA |
8495 | new_stop_id (); |
8496 | ||
29f49a6a PA |
8497 | /* If an exception is thrown from this point on, make sure to |
8498 | propagate GDB's knowledge of the executing state to the | |
8499 | frontend/user running state. A QUIT is an easy exception to see | |
8500 | here, so do this before any filtered output. */ | |
731f534f | 8501 | |
5b6d1e4f | 8502 | ptid_t finish_ptid = null_ptid; |
731f534f | 8503 | |
c35b1492 | 8504 | if (!non_stop) |
5b6d1e4f | 8505 | finish_ptid = minus_one_ptid; |
e1316e60 PA |
8506 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8507 | || last.kind == TARGET_WAITKIND_EXITED) | |
8508 | { | |
8509 | /* On some targets, we may still have live threads in the | |
8510 | inferior when we get a process exit event. E.g., for | |
8511 | "checkpoint", when the current checkpoint/fork exits, | |
8512 | linux-fork.c automatically switches to another fork from | |
8513 | within target_mourn_inferior. */ | |
731f534f | 8514 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8515 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 PA |
8516 | } |
8517 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5b6d1e4f PA |
8518 | finish_ptid = inferior_ptid; |
8519 | ||
8520 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8521 | if (finish_ptid != null_ptid) | |
8522 | { | |
8523 | maybe_finish_thread_state.emplace | |
8524 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8525 | } | |
29f49a6a | 8526 | |
b57bacec PA |
8527 | /* As we're presenting a stop, and potentially removing breakpoints, |
8528 | update the thread list so we can tell whether there are threads | |
8529 | running on the target. With target remote, for example, we can | |
8530 | only learn about new threads when we explicitly update the thread | |
8531 | list. Do this before notifying the interpreters about signal | |
8532 | stops, end of stepping ranges, etc., so that the "new thread" | |
8533 | output is emitted before e.g., "Program received signal FOO", | |
8534 | instead of after. */ | |
8535 | update_thread_list (); | |
8536 | ||
8537 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 8538 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 8539 | |
c906108c SS |
8540 | /* As with the notification of thread events, we want to delay |
8541 | notifying the user that we've switched thread context until | |
8542 | the inferior actually stops. | |
8543 | ||
73b65bb0 DJ |
8544 | There's no point in saying anything if the inferior has exited. |
8545 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8546 | "received a signal". |
8547 | ||
8548 | Also skip saying anything in non-stop mode. In that mode, as we | |
8549 | don't want GDB to switch threads behind the user's back, to avoid | |
8550 | races where the user is typing a command to apply to thread x, | |
8551 | but GDB switches to thread y before the user finishes entering | |
8552 | the command, fetch_inferior_event installs a cleanup to restore | |
8553 | the current thread back to the thread the user had selected right | |
8554 | after this event is handled, so we're not really switching, only | |
8555 | informing of a stop. */ | |
4f8d22e3 | 8556 | if (!non_stop |
731f534f | 8557 | && previous_inferior_ptid != inferior_ptid |
55f6301a | 8558 | && target_has_execution () |
73b65bb0 | 8559 | && last.kind != TARGET_WAITKIND_SIGNALLED |
0e5bf2a8 PA |
8560 | && last.kind != TARGET_WAITKIND_EXITED |
8561 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8562 | { |
0e454242 | 8563 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8564 | { |
223ffa71 | 8565 | target_terminal::ours_for_output (); |
3b12939d | 8566 | printf_filtered (_("[Switching to %s]\n"), |
a068643d | 8567 | target_pid_to_str (inferior_ptid).c_str ()); |
3b12939d PA |
8568 | annotate_thread_changed (); |
8569 | } | |
39f77062 | 8570 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8571 | } |
c906108c | 8572 | |
0e5bf2a8 PA |
8573 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8574 | { | |
0e454242 | 8575 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8576 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8577 | { | |
223ffa71 | 8578 | target_terminal::ours_for_output (); |
3b12939d PA |
8579 | printf_filtered (_("No unwaited-for children left.\n")); |
8580 | } | |
0e5bf2a8 PA |
8581 | } |
8582 | ||
b57bacec | 8583 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8584 | maybe_remove_breakpoints (); |
c906108c | 8585 | |
c906108c SS |
8586 | /* If an auto-display called a function and that got a signal, |
8587 | delete that auto-display to avoid an infinite recursion. */ | |
8588 | ||
8589 | if (stopped_by_random_signal) | |
8590 | disable_current_display (); | |
8591 | ||
0e454242 | 8592 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8593 | { |
8594 | async_enable_stdin (); | |
8595 | } | |
c906108c | 8596 | |
388a7084 | 8597 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8598 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8599 | |
8600 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8601 | and current location is based on that. Handle the case where the | |
8602 | dummy call is returning after being stopped. E.g. the dummy call | |
8603 | previously hit a breakpoint. (If the dummy call returns | |
8604 | normally, we won't reach here.) Do this before the stop hook is | |
8605 | run, so that it doesn't get to see the temporary dummy frame, | |
8606 | which is not where we'll present the stop. */ | |
8607 | if (has_stack_frames ()) | |
8608 | { | |
8609 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8610 | { | |
8611 | /* Pop the empty frame that contains the stack dummy. This | |
8612 | also restores inferior state prior to the call (struct | |
8613 | infcall_suspend_state). */ | |
8614 | struct frame_info *frame = get_current_frame (); | |
8615 | ||
8616 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8617 | frame_pop (frame); | |
8618 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8619 | does which means there's now no selected frame. */ | |
8620 | } | |
8621 | ||
8622 | select_frame (get_current_frame ()); | |
8623 | ||
8624 | /* Set the current source location. */ | |
8625 | set_current_sal_from_frame (get_current_frame ()); | |
8626 | } | |
dd7e2d2b PA |
8627 | |
8628 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8629 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8630 | if (stop_command != NULL) |
8631 | { | |
2d844eaf | 8632 | stop_context saved_context; |
4c2f2a79 | 8633 | |
a70b8144 | 8634 | try |
bf469271 PA |
8635 | { |
8636 | execute_cmd_pre_hook (stop_command); | |
8637 | } | |
230d2906 | 8638 | catch (const gdb_exception &ex) |
bf469271 PA |
8639 | { |
8640 | exception_fprintf (gdb_stderr, ex, | |
8641 | "Error while running hook_stop:\n"); | |
8642 | } | |
4c2f2a79 PA |
8643 | |
8644 | /* If the stop hook resumes the target, then there's no point in | |
8645 | trying to notify about the previous stop; its context is | |
8646 | gone. Likewise if the command switches thread or inferior -- | |
8647 | the observers would print a stop for the wrong | |
8648 | thread/inferior. */ | |
2d844eaf TT |
8649 | if (saved_context.changed ()) |
8650 | return 1; | |
4c2f2a79 | 8651 | } |
dd7e2d2b | 8652 | |
388a7084 PA |
8653 | /* Notify observers about the stop. This is where the interpreters |
8654 | print the stop event. */ | |
d7e15655 | 8655 | if (inferior_ptid != null_ptid) |
76727919 | 8656 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
24a7f1b5 | 8657 | stop_print_frame); |
388a7084 | 8658 | else |
76727919 | 8659 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8660 | |
243a9253 PA |
8661 | annotate_stopped (); |
8662 | ||
55f6301a | 8663 | if (target_has_execution ()) |
48844aa6 PA |
8664 | { |
8665 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
fe726667 PA |
8666 | && last.kind != TARGET_WAITKIND_EXITED |
8667 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8668 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8669 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8670 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8671 | } |
6c95b8df PA |
8672 | |
8673 | /* Try to get rid of automatically added inferiors that are no | |
8674 | longer needed. Keeping those around slows down things linearly. | |
8675 | Note that this never removes the current inferior. */ | |
8676 | prune_inferiors (); | |
4c2f2a79 PA |
8677 | |
8678 | return 0; | |
c906108c | 8679 | } |
c906108c | 8680 | \f |
c5aa993b | 8681 | int |
96baa820 | 8682 | signal_stop_state (int signo) |
c906108c | 8683 | { |
d6b48e9c | 8684 | return signal_stop[signo]; |
c906108c SS |
8685 | } |
8686 | ||
c5aa993b | 8687 | int |
96baa820 | 8688 | signal_print_state (int signo) |
c906108c SS |
8689 | { |
8690 | return signal_print[signo]; | |
8691 | } | |
8692 | ||
c5aa993b | 8693 | int |
96baa820 | 8694 | signal_pass_state (int signo) |
c906108c SS |
8695 | { |
8696 | return signal_program[signo]; | |
8697 | } | |
8698 | ||
2455069d UW |
8699 | static void |
8700 | signal_cache_update (int signo) | |
8701 | { | |
8702 | if (signo == -1) | |
8703 | { | |
a493e3e2 | 8704 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8705 | signal_cache_update (signo); |
8706 | ||
8707 | return; | |
8708 | } | |
8709 | ||
8710 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8711 | && signal_print[signo] == 0 | |
ab04a2af TT |
8712 | && signal_program[signo] == 1 |
8713 | && signal_catch[signo] == 0); | |
2455069d UW |
8714 | } |
8715 | ||
488f131b | 8716 | int |
7bda5e4a | 8717 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8718 | { |
8719 | int ret = signal_stop[signo]; | |
abbb1732 | 8720 | |
d4f3574e | 8721 | signal_stop[signo] = state; |
2455069d | 8722 | signal_cache_update (signo); |
d4f3574e SS |
8723 | return ret; |
8724 | } | |
8725 | ||
488f131b | 8726 | int |
7bda5e4a | 8727 | signal_print_update (int signo, int state) |
d4f3574e SS |
8728 | { |
8729 | int ret = signal_print[signo]; | |
abbb1732 | 8730 | |
d4f3574e | 8731 | signal_print[signo] = state; |
2455069d | 8732 | signal_cache_update (signo); |
d4f3574e SS |
8733 | return ret; |
8734 | } | |
8735 | ||
488f131b | 8736 | int |
7bda5e4a | 8737 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8738 | { |
8739 | int ret = signal_program[signo]; | |
abbb1732 | 8740 | |
d4f3574e | 8741 | signal_program[signo] = state; |
2455069d | 8742 | signal_cache_update (signo); |
d4f3574e SS |
8743 | return ret; |
8744 | } | |
8745 | ||
ab04a2af TT |
8746 | /* Update the global 'signal_catch' from INFO and notify the |
8747 | target. */ | |
8748 | ||
8749 | void | |
8750 | signal_catch_update (const unsigned int *info) | |
8751 | { | |
8752 | int i; | |
8753 | ||
8754 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8755 | signal_catch[i] = info[i] > 0; | |
8756 | signal_cache_update (-1); | |
adc6a863 | 8757 | target_pass_signals (signal_pass); |
ab04a2af TT |
8758 | } |
8759 | ||
c906108c | 8760 | static void |
96baa820 | 8761 | sig_print_header (void) |
c906108c | 8762 | { |
3e43a32a MS |
8763 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8764 | "to program\tDescription\n")); | |
c906108c SS |
8765 | } |
8766 | ||
8767 | static void | |
2ea28649 | 8768 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8769 | { |
2ea28649 | 8770 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8771 | int name_padding = 13 - strlen (name); |
96baa820 | 8772 | |
c906108c SS |
8773 | if (name_padding <= 0) |
8774 | name_padding = 0; | |
8775 | ||
8776 | printf_filtered ("%s", name); | |
488f131b | 8777 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8778 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8779 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8780 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8781 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8782 | } |
8783 | ||
8784 | /* Specify how various signals in the inferior should be handled. */ | |
8785 | ||
8786 | static void | |
0b39b52e | 8787 | handle_command (const char *args, int from_tty) |
c906108c | 8788 | { |
c906108c | 8789 | int digits, wordlen; |
b926417a | 8790 | int sigfirst, siglast; |
2ea28649 | 8791 | enum gdb_signal oursig; |
c906108c | 8792 | int allsigs; |
c906108c SS |
8793 | |
8794 | if (args == NULL) | |
8795 | { | |
e2e0b3e5 | 8796 | error_no_arg (_("signal to handle")); |
c906108c SS |
8797 | } |
8798 | ||
1777feb0 | 8799 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8800 | |
adc6a863 PA |
8801 | const size_t nsigs = GDB_SIGNAL_LAST; |
8802 | unsigned char sigs[nsigs] {}; | |
c906108c | 8803 | |
1777feb0 | 8804 | /* Break the command line up into args. */ |
c906108c | 8805 | |
773a1edc | 8806 | gdb_argv built_argv (args); |
c906108c SS |
8807 | |
8808 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8809 | actions. Signal numbers and signal names may be interspersed with | |
8810 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8811 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8812 | |
773a1edc | 8813 | for (char *arg : built_argv) |
c906108c | 8814 | { |
773a1edc TT |
8815 | wordlen = strlen (arg); |
8816 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8817 | {; |
8818 | } | |
8819 | allsigs = 0; | |
8820 | sigfirst = siglast = -1; | |
8821 | ||
773a1edc | 8822 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8823 | { |
8824 | /* Apply action to all signals except those used by the | |
1777feb0 | 8825 | debugger. Silently skip those. */ |
c906108c SS |
8826 | allsigs = 1; |
8827 | sigfirst = 0; | |
8828 | siglast = nsigs - 1; | |
8829 | } | |
773a1edc | 8830 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8831 | { |
8832 | SET_SIGS (nsigs, sigs, signal_stop); | |
8833 | SET_SIGS (nsigs, sigs, signal_print); | |
8834 | } | |
773a1edc | 8835 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8836 | { |
8837 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8838 | } | |
773a1edc | 8839 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8840 | { |
8841 | SET_SIGS (nsigs, sigs, signal_print); | |
8842 | } | |
773a1edc | 8843 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8844 | { |
8845 | SET_SIGS (nsigs, sigs, signal_program); | |
8846 | } | |
773a1edc | 8847 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8848 | { |
8849 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8850 | } | |
773a1edc | 8851 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8852 | { |
8853 | SET_SIGS (nsigs, sigs, signal_program); | |
8854 | } | |
773a1edc | 8855 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8856 | { |
8857 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8858 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8859 | } | |
773a1edc | 8860 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8861 | { |
8862 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8863 | } | |
8864 | else if (digits > 0) | |
8865 | { | |
8866 | /* It is numeric. The numeric signal refers to our own | |
8867 | internal signal numbering from target.h, not to host/target | |
8868 | signal number. This is a feature; users really should be | |
8869 | using symbolic names anyway, and the common ones like | |
8870 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8871 | ||
8872 | sigfirst = siglast = (int) | |
773a1edc TT |
8873 | gdb_signal_from_command (atoi (arg)); |
8874 | if (arg[digits] == '-') | |
c906108c SS |
8875 | { |
8876 | siglast = (int) | |
773a1edc | 8877 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8878 | } |
8879 | if (sigfirst > siglast) | |
8880 | { | |
1777feb0 | 8881 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8882 | std::swap (sigfirst, siglast); |
c906108c SS |
8883 | } |
8884 | } | |
8885 | else | |
8886 | { | |
773a1edc | 8887 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8888 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8889 | { |
8890 | sigfirst = siglast = (int) oursig; | |
8891 | } | |
8892 | else | |
8893 | { | |
8894 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8895 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8896 | } |
8897 | } | |
8898 | ||
8899 | /* If any signal numbers or symbol names were found, set flags for | |
dda83cd7 | 8900 | which signals to apply actions to. */ |
c906108c | 8901 | |
b926417a | 8902 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8903 | { |
2ea28649 | 8904 | switch ((enum gdb_signal) signum) |
c906108c | 8905 | { |
a493e3e2 PA |
8906 | case GDB_SIGNAL_TRAP: |
8907 | case GDB_SIGNAL_INT: | |
c906108c SS |
8908 | if (!allsigs && !sigs[signum]) |
8909 | { | |
9e2f0ad4 | 8910 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8911 | Are you sure you want to change it? "), |
2ea28649 | 8912 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8913 | { |
8914 | sigs[signum] = 1; | |
8915 | } | |
8916 | else | |
c119e040 | 8917 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8918 | } |
8919 | break; | |
a493e3e2 PA |
8920 | case GDB_SIGNAL_0: |
8921 | case GDB_SIGNAL_DEFAULT: | |
8922 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8923 | /* Make sure that "all" doesn't print these. */ |
8924 | break; | |
8925 | default: | |
8926 | sigs[signum] = 1; | |
8927 | break; | |
8928 | } | |
8929 | } | |
c906108c SS |
8930 | } |
8931 | ||
b926417a | 8932 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8933 | if (sigs[signum]) |
8934 | { | |
2455069d | 8935 | signal_cache_update (-1); |
adc6a863 PA |
8936 | target_pass_signals (signal_pass); |
8937 | target_program_signals (signal_program); | |
c906108c | 8938 | |
3a031f65 PA |
8939 | if (from_tty) |
8940 | { | |
8941 | /* Show the results. */ | |
8942 | sig_print_header (); | |
8943 | for (; signum < nsigs; signum++) | |
8944 | if (sigs[signum]) | |
aead7601 | 8945 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8946 | } |
8947 | ||
8948 | break; | |
8949 | } | |
c906108c SS |
8950 | } |
8951 | ||
de0bea00 MF |
8952 | /* Complete the "handle" command. */ |
8953 | ||
eb3ff9a5 | 8954 | static void |
de0bea00 | 8955 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8956 | completion_tracker &tracker, |
6f937416 | 8957 | const char *text, const char *word) |
de0bea00 | 8958 | { |
de0bea00 MF |
8959 | static const char * const keywords[] = |
8960 | { | |
8961 | "all", | |
8962 | "stop", | |
8963 | "ignore", | |
8964 | "print", | |
8965 | "pass", | |
8966 | "nostop", | |
8967 | "noignore", | |
8968 | "noprint", | |
8969 | "nopass", | |
8970 | NULL, | |
8971 | }; | |
8972 | ||
eb3ff9a5 PA |
8973 | signal_completer (ignore, tracker, text, word); |
8974 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8975 | } |
8976 | ||
2ea28649 PA |
8977 | enum gdb_signal |
8978 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8979 | { |
8980 | if (num >= 1 && num <= 15) | |
2ea28649 | 8981 | return (enum gdb_signal) num; |
ed01b82c PA |
8982 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8983 | Use \"info signals\" for a list of symbolic signals.")); | |
8984 | } | |
8985 | ||
c906108c SS |
8986 | /* Print current contents of the tables set by the handle command. |
8987 | It is possible we should just be printing signals actually used | |
8988 | by the current target (but for things to work right when switching | |
8989 | targets, all signals should be in the signal tables). */ | |
8990 | ||
8991 | static void | |
1d12d88f | 8992 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8993 | { |
2ea28649 | 8994 | enum gdb_signal oursig; |
abbb1732 | 8995 | |
c906108c SS |
8996 | sig_print_header (); |
8997 | ||
8998 | if (signum_exp) | |
8999 | { | |
9000 | /* First see if this is a symbol name. */ | |
2ea28649 | 9001 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 9002 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
9003 | { |
9004 | /* No, try numeric. */ | |
9005 | oursig = | |
2ea28649 | 9006 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
9007 | } |
9008 | sig_print_info (oursig); | |
9009 | return; | |
9010 | } | |
9011 | ||
9012 | printf_filtered ("\n"); | |
9013 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
9014 | for (oursig = GDB_SIGNAL_FIRST; |
9015 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 9016 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
9017 | { |
9018 | QUIT; | |
9019 | ||
a493e3e2 PA |
9020 | if (oursig != GDB_SIGNAL_UNKNOWN |
9021 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
9022 | sig_print_info (oursig); |
9023 | } | |
9024 | ||
3e43a32a MS |
9025 | printf_filtered (_("\nUse the \"handle\" command " |
9026 | "to change these tables.\n")); | |
c906108c | 9027 | } |
4aa995e1 PA |
9028 | |
9029 | /* The $_siginfo convenience variable is a bit special. We don't know | |
9030 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 9031 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
9032 | also dependent on which thread you have selected. |
9033 | ||
9034 | 1. making $_siginfo be an internalvar that creates a new value on | |
9035 | access. | |
9036 | ||
9037 | 2. making the value of $_siginfo be an lval_computed value. */ | |
9038 | ||
9039 | /* This function implements the lval_computed support for reading a | |
9040 | $_siginfo value. */ | |
9041 | ||
9042 | static void | |
9043 | siginfo_value_read (struct value *v) | |
9044 | { | |
9045 | LONGEST transferred; | |
9046 | ||
a911d87a PA |
9047 | /* If we can access registers, so can we access $_siginfo. Likewise |
9048 | vice versa. */ | |
9049 | validate_registers_access (); | |
c709acd1 | 9050 | |
4aa995e1 | 9051 | transferred = |
328d42d8 SM |
9052 | target_read (current_inferior ()->top_target (), |
9053 | TARGET_OBJECT_SIGNAL_INFO, | |
4aa995e1 PA |
9054 | NULL, |
9055 | value_contents_all_raw (v), | |
9056 | value_offset (v), | |
9057 | TYPE_LENGTH (value_type (v))); | |
9058 | ||
9059 | if (transferred != TYPE_LENGTH (value_type (v))) | |
9060 | error (_("Unable to read siginfo")); | |
9061 | } | |
9062 | ||
9063 | /* This function implements the lval_computed support for writing a | |
9064 | $_siginfo value. */ | |
9065 | ||
9066 | static void | |
9067 | siginfo_value_write (struct value *v, struct value *fromval) | |
9068 | { | |
9069 | LONGEST transferred; | |
9070 | ||
a911d87a PA |
9071 | /* If we can access registers, so can we access $_siginfo. Likewise |
9072 | vice versa. */ | |
9073 | validate_registers_access (); | |
c709acd1 | 9074 | |
328d42d8 | 9075 | transferred = target_write (current_inferior ()->top_target (), |
4aa995e1 PA |
9076 | TARGET_OBJECT_SIGNAL_INFO, |
9077 | NULL, | |
9078 | value_contents_all_raw (fromval), | |
9079 | value_offset (v), | |
9080 | TYPE_LENGTH (value_type (fromval))); | |
9081 | ||
9082 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
9083 | error (_("Unable to write siginfo")); | |
9084 | } | |
9085 | ||
c8f2448a | 9086 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
9087 | { |
9088 | siginfo_value_read, | |
9089 | siginfo_value_write | |
9090 | }; | |
9091 | ||
9092 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
9093 | the current thread using architecture GDBARCH. Return a void value |
9094 | if there's no object available. */ | |
4aa995e1 | 9095 | |
2c0b251b | 9096 | static struct value * |
22d2b532 SDJ |
9097 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
9098 | void *ignore) | |
4aa995e1 | 9099 | { |
841de120 | 9100 | if (target_has_stack () |
d7e15655 | 9101 | && inferior_ptid != null_ptid |
78267919 | 9102 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 9103 | { |
78267919 | 9104 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 9105 | |
78267919 | 9106 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
9107 | } |
9108 | ||
78267919 | 9109 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
9110 | } |
9111 | ||
c906108c | 9112 | \f |
16c381f0 JK |
9113 | /* infcall_suspend_state contains state about the program itself like its |
9114 | registers and any signal it received when it last stopped. | |
9115 | This state must be restored regardless of how the inferior function call | |
9116 | ends (either successfully, or after it hits a breakpoint or signal) | |
9117 | if the program is to properly continue where it left off. */ | |
9118 | ||
6bf78e29 | 9119 | class infcall_suspend_state |
7a292a7a | 9120 | { |
6bf78e29 AB |
9121 | public: |
9122 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
9123 | once the inferior function call has finished. */ | |
9124 | infcall_suspend_state (struct gdbarch *gdbarch, | |
dda83cd7 SM |
9125 | const struct thread_info *tp, |
9126 | struct regcache *regcache) | |
6bf78e29 AB |
9127 | : m_thread_suspend (tp->suspend), |
9128 | m_registers (new readonly_detached_regcache (*regcache)) | |
9129 | { | |
9130 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
9131 | ||
9132 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
9133 | { | |
dda83cd7 SM |
9134 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
9135 | size_t len = TYPE_LENGTH (type); | |
6bf78e29 | 9136 | |
dda83cd7 | 9137 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); |
6bf78e29 | 9138 | |
328d42d8 SM |
9139 | if (target_read (current_inferior ()->top_target (), |
9140 | TARGET_OBJECT_SIGNAL_INFO, NULL, | |
dda83cd7 SM |
9141 | siginfo_data.get (), 0, len) != len) |
9142 | { | |
9143 | /* Errors ignored. */ | |
9144 | siginfo_data.reset (nullptr); | |
9145 | } | |
6bf78e29 AB |
9146 | } |
9147 | ||
9148 | if (siginfo_data) | |
9149 | { | |
dda83cd7 SM |
9150 | m_siginfo_gdbarch = gdbarch; |
9151 | m_siginfo_data = std::move (siginfo_data); | |
6bf78e29 AB |
9152 | } |
9153 | } | |
9154 | ||
9155 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 9156 | |
6bf78e29 AB |
9157 | readonly_detached_regcache *registers () const |
9158 | { | |
9159 | return m_registers.get (); | |
9160 | } | |
9161 | ||
9162 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
9163 | ||
9164 | void restore (struct gdbarch *gdbarch, | |
dda83cd7 SM |
9165 | struct thread_info *tp, |
9166 | struct regcache *regcache) const | |
6bf78e29 AB |
9167 | { |
9168 | tp->suspend = m_thread_suspend; | |
9169 | ||
9170 | if (m_siginfo_gdbarch == gdbarch) | |
9171 | { | |
dda83cd7 | 9172 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
6bf78e29 | 9173 | |
dda83cd7 | 9174 | /* Errors ignored. */ |
328d42d8 SM |
9175 | target_write (current_inferior ()->top_target (), |
9176 | TARGET_OBJECT_SIGNAL_INFO, NULL, | |
dda83cd7 | 9177 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); |
6bf78e29 AB |
9178 | } |
9179 | ||
9180 | /* The inferior can be gone if the user types "print exit(0)" | |
9181 | (and perhaps other times). */ | |
55f6301a | 9182 | if (target_has_execution ()) |
6bf78e29 AB |
9183 | /* NB: The register write goes through to the target. */ |
9184 | regcache->restore (registers ()); | |
9185 | } | |
9186 | ||
9187 | private: | |
9188 | /* How the current thread stopped before the inferior function call was | |
9189 | executed. */ | |
9190 | struct thread_suspend_state m_thread_suspend; | |
9191 | ||
9192 | /* The registers before the inferior function call was executed. */ | |
9193 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 9194 | |
35515841 | 9195 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 9196 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
9197 | |
9198 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
9199 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
9200 | content would be invalid. */ | |
6bf78e29 | 9201 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
9202 | }; |
9203 | ||
cb524840 TT |
9204 | infcall_suspend_state_up |
9205 | save_infcall_suspend_state () | |
b89667eb | 9206 | { |
b89667eb | 9207 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 9208 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9209 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 9210 | |
6bf78e29 AB |
9211 | infcall_suspend_state_up inf_state |
9212 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 9213 | |
6bf78e29 AB |
9214 | /* Having saved the current state, adjust the thread state, discarding |
9215 | any stop signal information. The stop signal is not useful when | |
9216 | starting an inferior function call, and run_inferior_call will not use | |
9217 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 9218 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 9219 | |
b89667eb DE |
9220 | return inf_state; |
9221 | } | |
9222 | ||
9223 | /* Restore inferior session state to INF_STATE. */ | |
9224 | ||
9225 | void | |
16c381f0 | 9226 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
9227 | { |
9228 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 9229 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9230 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 9231 | |
6bf78e29 | 9232 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 9233 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
9234 | } |
9235 | ||
b89667eb | 9236 | void |
16c381f0 | 9237 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 9238 | { |
dd848631 | 9239 | delete inf_state; |
b89667eb DE |
9240 | } |
9241 | ||
daf6667d | 9242 | readonly_detached_regcache * |
16c381f0 | 9243 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 9244 | { |
6bf78e29 | 9245 | return inf_state->registers (); |
b89667eb DE |
9246 | } |
9247 | ||
16c381f0 JK |
9248 | /* infcall_control_state contains state regarding gdb's control of the |
9249 | inferior itself like stepping control. It also contains session state like | |
9250 | the user's currently selected frame. */ | |
b89667eb | 9251 | |
16c381f0 | 9252 | struct infcall_control_state |
b89667eb | 9253 | { |
16c381f0 JK |
9254 | struct thread_control_state thread_control; |
9255 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
9256 | |
9257 | /* Other fields: */ | |
ee841dd8 TT |
9258 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
9259 | int stopped_by_random_signal = 0; | |
7a292a7a | 9260 | |
79952e69 PA |
9261 | /* ID and level of the selected frame when the inferior function |
9262 | call was made. */ | |
ee841dd8 | 9263 | struct frame_id selected_frame_id {}; |
79952e69 | 9264 | int selected_frame_level = -1; |
7a292a7a SS |
9265 | }; |
9266 | ||
c906108c | 9267 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9268 | connection. */ |
c906108c | 9269 | |
cb524840 TT |
9270 | infcall_control_state_up |
9271 | save_infcall_control_state () | |
c906108c | 9272 | { |
cb524840 | 9273 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9274 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9275 | struct inferior *inf = current_inferior (); |
7a292a7a | 9276 | |
16c381f0 JK |
9277 | inf_status->thread_control = tp->control; |
9278 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9279 | |
8358c15c | 9280 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9281 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9282 | |
16c381f0 JK |
9283 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9284 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9285 | hand them back the original chain when restore_infcall_control_state is | |
9286 | called. */ | |
9287 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9288 | |
9289 | /* Other fields: */ | |
9290 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9291 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9292 | |
79952e69 PA |
9293 | save_selected_frame (&inf_status->selected_frame_id, |
9294 | &inf_status->selected_frame_level); | |
b89667eb | 9295 | |
7a292a7a | 9296 | return inf_status; |
c906108c SS |
9297 | } |
9298 | ||
b89667eb DE |
9299 | /* Restore inferior session state to INF_STATUS. */ |
9300 | ||
c906108c | 9301 | void |
16c381f0 | 9302 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9303 | { |
4e1c45ea | 9304 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9305 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9306 | |
8358c15c JK |
9307 | if (tp->control.step_resume_breakpoint) |
9308 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9309 | ||
5b79abe7 TT |
9310 | if (tp->control.exception_resume_breakpoint) |
9311 | tp->control.exception_resume_breakpoint->disposition | |
9312 | = disp_del_at_next_stop; | |
9313 | ||
d82142e2 | 9314 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9315 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9316 | |
16c381f0 JK |
9317 | tp->control = inf_status->thread_control; |
9318 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9319 | |
9320 | /* Other fields: */ | |
9321 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9322 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9323 | |
841de120 | 9324 | if (target_has_stack ()) |
c906108c | 9325 | { |
79952e69 PA |
9326 | restore_selected_frame (inf_status->selected_frame_id, |
9327 | inf_status->selected_frame_level); | |
c906108c | 9328 | } |
c906108c | 9329 | |
ee841dd8 | 9330 | delete inf_status; |
7a292a7a | 9331 | } |
c906108c SS |
9332 | |
9333 | void | |
16c381f0 | 9334 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9335 | { |
8358c15c JK |
9336 | if (inf_status->thread_control.step_resume_breakpoint) |
9337 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9338 | = disp_del_at_next_stop; | |
9339 | ||
5b79abe7 TT |
9340 | if (inf_status->thread_control.exception_resume_breakpoint) |
9341 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9342 | = disp_del_at_next_stop; | |
9343 | ||
1777feb0 | 9344 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9345 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9346 | |
ee841dd8 | 9347 | delete inf_status; |
7a292a7a | 9348 | } |
b89667eb | 9349 | \f |
7f89fd65 | 9350 | /* See infrun.h. */ |
0c557179 SDJ |
9351 | |
9352 | void | |
9353 | clear_exit_convenience_vars (void) | |
9354 | { | |
9355 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9356 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9357 | } | |
c5aa993b | 9358 | \f |
488f131b | 9359 | |
b2175913 MS |
9360 | /* User interface for reverse debugging: |
9361 | Set exec-direction / show exec-direction commands | |
9362 | (returns error unless target implements to_set_exec_direction method). */ | |
9363 | ||
170742de | 9364 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9365 | static const char exec_forward[] = "forward"; |
9366 | static const char exec_reverse[] = "reverse"; | |
9367 | static const char *exec_direction = exec_forward; | |
40478521 | 9368 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9369 | exec_forward, |
9370 | exec_reverse, | |
9371 | NULL | |
9372 | }; | |
9373 | ||
9374 | static void | |
eb4c3f4a | 9375 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9376 | struct cmd_list_element *cmd) |
9377 | { | |
05374cfd | 9378 | if (target_can_execute_reverse ()) |
b2175913 MS |
9379 | { |
9380 | if (!strcmp (exec_direction, exec_forward)) | |
9381 | execution_direction = EXEC_FORWARD; | |
9382 | else if (!strcmp (exec_direction, exec_reverse)) | |
9383 | execution_direction = EXEC_REVERSE; | |
9384 | } | |
8bbed405 MS |
9385 | else |
9386 | { | |
9387 | exec_direction = exec_forward; | |
9388 | error (_("Target does not support this operation.")); | |
9389 | } | |
b2175913 MS |
9390 | } |
9391 | ||
9392 | static void | |
9393 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9394 | struct cmd_list_element *cmd, const char *value) | |
9395 | { | |
9396 | switch (execution_direction) { | |
9397 | case EXEC_FORWARD: | |
9398 | fprintf_filtered (out, _("Forward.\n")); | |
9399 | break; | |
9400 | case EXEC_REVERSE: | |
9401 | fprintf_filtered (out, _("Reverse.\n")); | |
9402 | break; | |
b2175913 | 9403 | default: |
d8b34453 PA |
9404 | internal_error (__FILE__, __LINE__, |
9405 | _("bogus execution_direction value: %d"), | |
9406 | (int) execution_direction); | |
b2175913 MS |
9407 | } |
9408 | } | |
9409 | ||
d4db2f36 PA |
9410 | static void |
9411 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9412 | struct cmd_list_element *c, const char *value) | |
9413 | { | |
3e43a32a MS |
9414 | fprintf_filtered (file, _("Resuming the execution of threads " |
9415 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9416 | } |
ad52ddc6 | 9417 | |
22d2b532 SDJ |
9418 | /* Implementation of `siginfo' variable. */ |
9419 | ||
9420 | static const struct internalvar_funcs siginfo_funcs = | |
9421 | { | |
9422 | siginfo_make_value, | |
9423 | NULL, | |
9424 | NULL | |
9425 | }; | |
9426 | ||
372316f1 PA |
9427 | /* Callback for infrun's target events source. This is marked when a |
9428 | thread has a pending status to process. */ | |
9429 | ||
9430 | static void | |
9431 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9432 | { | |
6b36ddeb | 9433 | clear_async_event_handler (infrun_async_inferior_event_token); |
b1a35af2 | 9434 | inferior_event_handler (INF_REG_EVENT); |
372316f1 PA |
9435 | } |
9436 | ||
8087c3fa | 9437 | #if GDB_SELF_TEST |
b161a60d SM |
9438 | namespace selftests |
9439 | { | |
9440 | ||
9441 | /* Verify that when two threads with the same ptid exist (from two different | |
9442 | targets) and one of them changes ptid, we only update inferior_ptid if | |
9443 | it is appropriate. */ | |
9444 | ||
9445 | static void | |
9446 | infrun_thread_ptid_changed () | |
9447 | { | |
9448 | gdbarch *arch = current_inferior ()->gdbarch; | |
9449 | ||
9450 | /* The thread which inferior_ptid represents changes ptid. */ | |
9451 | { | |
9452 | scoped_restore_current_pspace_and_thread restore; | |
9453 | ||
9454 | scoped_mock_context<test_target_ops> target1 (arch); | |
9455 | scoped_mock_context<test_target_ops> target2 (arch); | |
9456 | target2.mock_inferior.next = &target1.mock_inferior; | |
9457 | ||
9458 | ptid_t old_ptid (111, 222); | |
9459 | ptid_t new_ptid (111, 333); | |
9460 | ||
9461 | target1.mock_inferior.pid = old_ptid.pid (); | |
9462 | target1.mock_thread.ptid = old_ptid; | |
9463 | target2.mock_inferior.pid = old_ptid.pid (); | |
9464 | target2.mock_thread.ptid = old_ptid; | |
9465 | ||
9466 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
9467 | set_current_inferior (&target1.mock_inferior); | |
9468 | ||
9469 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9470 | ||
9471 | gdb_assert (inferior_ptid == new_ptid); | |
9472 | } | |
9473 | ||
9474 | /* A thread with the same ptid as inferior_ptid, but from another target, | |
9475 | changes ptid. */ | |
9476 | { | |
9477 | scoped_restore_current_pspace_and_thread restore; | |
9478 | ||
9479 | scoped_mock_context<test_target_ops> target1 (arch); | |
9480 | scoped_mock_context<test_target_ops> target2 (arch); | |
9481 | target2.mock_inferior.next = &target1.mock_inferior; | |
9482 | ||
9483 | ptid_t old_ptid (111, 222); | |
9484 | ptid_t new_ptid (111, 333); | |
9485 | ||
9486 | target1.mock_inferior.pid = old_ptid.pid (); | |
9487 | target1.mock_thread.ptid = old_ptid; | |
9488 | target2.mock_inferior.pid = old_ptid.pid (); | |
9489 | target2.mock_thread.ptid = old_ptid; | |
9490 | ||
9491 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
9492 | set_current_inferior (&target2.mock_inferior); | |
9493 | ||
9494 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9495 | ||
9496 | gdb_assert (inferior_ptid == old_ptid); | |
9497 | } | |
9498 | } | |
9499 | ||
9500 | } /* namespace selftests */ | |
9501 | ||
8087c3fa JB |
9502 | #endif /* GDB_SELF_TEST */ |
9503 | ||
6c265988 | 9504 | void _initialize_infrun (); |
c906108c | 9505 | void |
6c265988 | 9506 | _initialize_infrun () |
c906108c | 9507 | { |
de0bea00 | 9508 | struct cmd_list_element *c; |
c906108c | 9509 | |
372316f1 PA |
9510 | /* Register extra event sources in the event loop. */ |
9511 | infrun_async_inferior_event_token | |
db20ebdf SM |
9512 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL, |
9513 | "infrun"); | |
372316f1 | 9514 | |
e0f25bd9 SM |
9515 | cmd_list_element *info_signals_cmd |
9516 | = add_info ("signals", info_signals_command, _("\ | |
1bedd215 AC |
9517 | What debugger does when program gets various signals.\n\ |
9518 | Specify a signal as argument to print info on that signal only.")); | |
e0f25bd9 | 9519 | add_info_alias ("handle", info_signals_cmd, 0); |
c906108c | 9520 | |
de0bea00 | 9521 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9522 | Specify how to handle signals.\n\ |
486c7739 | 9523 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9524 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9525 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9526 | will be displayed instead.\n\ |
9527 | \n\ | |
c906108c SS |
9528 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9529 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9530 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9531 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9532 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9533 | \n\ |
1bedd215 | 9534 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9535 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9536 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9537 | Print means print a message if this signal happens.\n\ | |
9538 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9539 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9540 | Pass and Stop may be combined.\n\ |
9541 | \n\ | |
9542 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9543 | may be interspersed with actions, with the actions being performed for\n\ | |
9544 | all signals cumulatively specified.")); | |
de0bea00 | 9545 | set_cmd_completer (c, handle_completer); |
486c7739 | 9546 | |
c906108c | 9547 | if (!dbx_commands) |
1a966eab AC |
9548 | stop_command = add_cmd ("stop", class_obscure, |
9549 | not_just_help_class_command, _("\ | |
9550 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9551 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9552 | of the program stops."), &cmdlist); |
c906108c | 9553 | |
94ba44a6 SM |
9554 | add_setshow_boolean_cmd |
9555 | ("infrun", class_maintenance, &debug_infrun, | |
9556 | _("Set inferior debugging."), | |
9557 | _("Show inferior debugging."), | |
9558 | _("When non-zero, inferior specific debugging is enabled."), | |
9559 | NULL, show_debug_infrun, &setdebuglist, &showdebuglist); | |
527159b7 | 9560 | |
ad52ddc6 PA |
9561 | add_setshow_boolean_cmd ("non-stop", no_class, |
9562 | &non_stop_1, _("\ | |
9563 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9564 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9565 | When debugging a multi-threaded program and this setting is\n\ | |
9566 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9567 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9568 | all other threads in the program while you interact with the thread of\n\ | |
9569 | interest. When you continue or step a thread, you can allow the other\n\ | |
9570 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9571 | thread's state, all threads stop.\n\ | |
9572 | \n\ | |
9573 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9574 | to run freely. You'll be able to step each thread independently,\n\ | |
9575 | leave it stopped or free to run as needed."), | |
9576 | set_non_stop, | |
9577 | show_non_stop, | |
9578 | &setlist, | |
9579 | &showlist); | |
9580 | ||
adc6a863 | 9581 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9582 | { |
9583 | signal_stop[i] = 1; | |
9584 | signal_print[i] = 1; | |
9585 | signal_program[i] = 1; | |
ab04a2af | 9586 | signal_catch[i] = 0; |
c906108c SS |
9587 | } |
9588 | ||
4d9d9d04 PA |
9589 | /* Signals caused by debugger's own actions should not be given to |
9590 | the program afterwards. | |
9591 | ||
9592 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9593 | explicitly specifies that it should be delivered to the target | |
9594 | program. Typically, that would occur when a user is debugging a | |
9595 | target monitor on a simulator: the target monitor sets a | |
9596 | breakpoint; the simulator encounters this breakpoint and halts | |
9597 | the simulation handing control to GDB; GDB, noting that the stop | |
9598 | address doesn't map to any known breakpoint, returns control back | |
9599 | to the simulator; the simulator then delivers the hardware | |
9600 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9601 | debugged. */ | |
a493e3e2 PA |
9602 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9603 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9604 | |
9605 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9606 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9607 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9608 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9609 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9610 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9611 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9612 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9613 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9614 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9615 | signal_print[GDB_SIGNAL_IO] = 0; | |
9616 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9617 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9618 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9619 | signal_print[GDB_SIGNAL_URG] = 0; | |
9620 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9621 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9622 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9623 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9624 | |
cd0fc7c3 SS |
9625 | /* These signals are used internally by user-level thread |
9626 | implementations. (See signal(5) on Solaris.) Like the above | |
9627 | signals, a healthy program receives and handles them as part of | |
9628 | its normal operation. */ | |
a493e3e2 PA |
9629 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9630 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9631 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9632 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9633 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9634 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9635 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9636 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9637 | |
2455069d UW |
9638 | /* Update cached state. */ |
9639 | signal_cache_update (-1); | |
9640 | ||
85c07804 AC |
9641 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9642 | &stop_on_solib_events, _("\ | |
9643 | Set stopping for shared library events."), _("\ | |
9644 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9645 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9646 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9647 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9648 | set_stop_on_solib_events, |
920d2a44 | 9649 | show_stop_on_solib_events, |
85c07804 | 9650 | &setlist, &showlist); |
c906108c | 9651 | |
7ab04401 AC |
9652 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9653 | follow_fork_mode_kind_names, | |
9654 | &follow_fork_mode_string, _("\ | |
9655 | Set debugger response to a program call of fork or vfork."), _("\ | |
9656 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9657 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9658 | parent - the original process is debugged after a fork\n\ | |
9659 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9660 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9661 | By default, the debugger will follow the parent process."), |
9662 | NULL, | |
920d2a44 | 9663 | show_follow_fork_mode_string, |
7ab04401 AC |
9664 | &setlist, &showlist); |
9665 | ||
6c95b8df PA |
9666 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9667 | follow_exec_mode_names, | |
9668 | &follow_exec_mode_string, _("\ | |
9669 | Set debugger response to a program call of exec."), _("\ | |
9670 | Show debugger response to a program call of exec."), _("\ | |
9671 | An exec call replaces the program image of a process.\n\ | |
9672 | \n\ | |
9673 | follow-exec-mode can be:\n\ | |
9674 | \n\ | |
cce7e648 | 9675 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9676 | to this new inferior. The program the process was running before\n\ |
9677 | the exec call can be restarted afterwards by restarting the original\n\ | |
9678 | inferior.\n\ | |
9679 | \n\ | |
9680 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9681 | The new executable image replaces the previous executable loaded in\n\ | |
9682 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9683 | the executable the process was running after the exec call.\n\ | |
9684 | \n\ | |
9685 | By default, the debugger will use the same inferior."), | |
9686 | NULL, | |
9687 | show_follow_exec_mode_string, | |
9688 | &setlist, &showlist); | |
9689 | ||
7ab04401 AC |
9690 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9691 | scheduler_enums, &scheduler_mode, _("\ | |
9692 | Set mode for locking scheduler during execution."), _("\ | |
9693 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9694 | off == no locking (threads may preempt at any time)\n\ |
9695 | on == full locking (no thread except the current thread may run)\n\ | |
dda83cd7 | 9696 | This applies to both normal execution and replay mode.\n\ |
f2665db5 | 9697 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ |
dda83cd7 SM |
9698 | In this mode, other threads may run during other commands.\n\ |
9699 | This applies to both normal execution and replay mode.\n\ | |
f2665db5 | 9700 | replay == scheduler locked in replay mode and unlocked during normal execution."), |
7ab04401 | 9701 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9702 | show_scheduler_mode, |
7ab04401 | 9703 | &setlist, &showlist); |
5fbbeb29 | 9704 | |
d4db2f36 PA |
9705 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9706 | Set mode for resuming threads of all processes."), _("\ | |
9707 | Show mode for resuming threads of all processes."), _("\ | |
9708 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9709 | threads of all processes. When off (which is the default), execution\n\ | |
9710 | commands only resume the threads of the current process. The set of\n\ | |
9711 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9712 | mode (see help set scheduler-locking)."), | |
9713 | NULL, | |
9714 | show_schedule_multiple, | |
9715 | &setlist, &showlist); | |
9716 | ||
5bf193a2 AC |
9717 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9718 | Set mode of the step operation."), _("\ | |
9719 | Show mode of the step operation."), _("\ | |
9720 | When set, doing a step over a function without debug line information\n\ | |
9721 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9722 | function is skipped and the step command stops at a different source line."), | |
9723 | NULL, | |
920d2a44 | 9724 | show_step_stop_if_no_debug, |
5bf193a2 | 9725 | &setlist, &showlist); |
ca6724c1 | 9726 | |
72d0e2c5 YQ |
9727 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9728 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9729 | Set debugger's willingness to use displaced stepping."), _("\ |
9730 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9731 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9732 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9733 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9734 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9735 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9736 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9737 | NULL, |
9738 | show_can_use_displaced_stepping, | |
9739 | &setlist, &showlist); | |
237fc4c9 | 9740 | |
b2175913 MS |
9741 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9742 | &exec_direction, _("Set direction of execution.\n\ | |
9743 | Options are 'forward' or 'reverse'."), | |
9744 | _("Show direction of execution (forward/reverse)."), | |
9745 | _("Tells gdb whether to execute forward or backward."), | |
9746 | set_exec_direction_func, show_exec_direction_func, | |
9747 | &setlist, &showlist); | |
9748 | ||
6c95b8df PA |
9749 | /* Set/show detach-on-fork: user-settable mode. */ |
9750 | ||
9751 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9752 | Set whether gdb will detach the child of a fork."), _("\ | |
9753 | Show whether gdb will detach the child of a fork."), _("\ | |
9754 | Tells gdb whether to detach the child of a fork."), | |
9755 | NULL, NULL, &setlist, &showlist); | |
9756 | ||
03583c20 UW |
9757 | /* Set/show disable address space randomization mode. */ |
9758 | ||
9759 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9760 | &disable_randomization, _("\ | |
9761 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9762 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9763 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9764 | address space is disabled. Standalone programs run with the randomization\n\ | |
9765 | enabled by default on some platforms."), | |
9766 | &set_disable_randomization, | |
9767 | &show_disable_randomization, | |
9768 | &setlist, &showlist); | |
9769 | ||
ca6724c1 | 9770 | /* ptid initializations */ |
ca6724c1 KB |
9771 | inferior_ptid = null_ptid; |
9772 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9773 | |
c90e7d63 SM |
9774 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed, |
9775 | "infrun"); | |
9776 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested, | |
9777 | "infrun"); | |
9778 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit, "infrun"); | |
9779 | gdb::observers::inferior_exit.attach (infrun_inferior_exit, "infrun"); | |
9780 | gdb::observers::inferior_execd.attach (infrun_inferior_execd, "infrun"); | |
4aa995e1 PA |
9781 | |
9782 | /* Explicitly create without lookup, since that tries to create a | |
9783 | value with a void typed value, and when we get here, gdbarch | |
9784 | isn't initialized yet. At this point, we're quite sure there | |
9785 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9786 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9787 | |
9788 | add_setshow_boolean_cmd ("observer", no_class, | |
9789 | &observer_mode_1, _("\ | |
9790 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9791 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9792 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9793 | affect its execution. Registers and memory may not be changed,\n\ | |
9794 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9795 | or signalled."), | |
9796 | set_observer_mode, | |
9797 | show_observer_mode, | |
9798 | &setlist, | |
9799 | &showlist); | |
b161a60d SM |
9800 | |
9801 | #if GDB_SELF_TEST | |
9802 | selftests::register_test ("infrun_thread_ptid_changed", | |
9803 | selftests::infrun_thread_ptid_changed); | |
9804 | #endif | |
c906108c | 9805 | } |