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")); | |
d83ad864 DB |
429 | return 1; |
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; |
5b6d1e4f | 480 | 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. */ | |
524 | solib_create_inferior_hook (0); | |
525 | } | |
d83ad864 DB |
526 | } |
527 | ||
528 | if (has_vforked) | |
529 | { | |
530 | struct inferior *parent_inf; | |
531 | ||
532 | parent_inf = current_inferior (); | |
533 | ||
534 | /* If we detached from the child, then we have to be careful | |
535 | to not insert breakpoints in the parent until the child | |
536 | is done with the shared memory region. However, if we're | |
537 | staying attached to the child, then we can and should | |
538 | insert breakpoints, so that we can debug it. A | |
539 | subsequent child exec or exit is enough to know when does | |
540 | the child stops using the parent's address space. */ | |
541 | parent_inf->waiting_for_vfork_done = detach_fork; | |
542 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
543 | } | |
544 | } | |
545 | else | |
546 | { | |
547 | /* Follow the child. */ | |
548 | struct inferior *parent_inf, *child_inf; | |
549 | struct program_space *parent_pspace; | |
550 | ||
f67c0c91 | 551 | if (print_inferior_events) |
d83ad864 | 552 | { |
f67c0c91 SDJ |
553 | std::string parent_pid = target_pid_to_str (parent_ptid); |
554 | std::string child_pid = target_pid_to_str (child_ptid); | |
555 | ||
223ffa71 | 556 | target_terminal::ours_for_output (); |
6f259a23 | 557 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
558 | _("[Attaching after %s %s to child %s]\n"), |
559 | parent_pid.c_str (), | |
6f259a23 | 560 | has_vforked ? "vfork" : "fork", |
f67c0c91 | 561 | child_pid.c_str ()); |
d83ad864 DB |
562 | } |
563 | ||
564 | /* Add the new inferior first, so that the target_detach below | |
565 | doesn't unpush the target. */ | |
566 | ||
e99b03dc | 567 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
568 | |
569 | parent_inf = current_inferior (); | |
570 | child_inf->attach_flag = parent_inf->attach_flag; | |
571 | copy_terminal_info (child_inf, parent_inf); | |
572 | child_inf->gdbarch = parent_inf->gdbarch; | |
573 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
574 | ||
575 | parent_pspace = parent_inf->pspace; | |
576 | ||
5b6d1e4f | 577 | process_stratum_target *target = parent_inf->process_target (); |
d83ad864 | 578 | |
5b6d1e4f PA |
579 | { |
580 | /* Hold a strong reference to the target while (maybe) | |
581 | detaching the parent. Otherwise detaching could close the | |
582 | target. */ | |
583 | auto target_ref = target_ops_ref::new_reference (target); | |
584 | ||
585 | /* If we're vforking, we want to hold on to the parent until | |
586 | the child exits or execs. At child exec or exit time we | |
587 | can remove the old breakpoints from the parent and detach | |
588 | or resume debugging it. Otherwise, detach the parent now; | |
589 | we'll want to reuse it's program/address spaces, but we | |
590 | can't set them to the child before removing breakpoints | |
591 | from the parent, otherwise, the breakpoints module could | |
592 | decide to remove breakpoints from the wrong process (since | |
593 | they'd be assigned to the same address space). */ | |
594 | ||
595 | if (has_vforked) | |
596 | { | |
597 | gdb_assert (child_inf->vfork_parent == NULL); | |
598 | gdb_assert (parent_inf->vfork_child == NULL); | |
599 | child_inf->vfork_parent = parent_inf; | |
600 | child_inf->pending_detach = 0; | |
601 | parent_inf->vfork_child = child_inf; | |
602 | parent_inf->pending_detach = detach_fork; | |
603 | parent_inf->waiting_for_vfork_done = 0; | |
604 | } | |
605 | else if (detach_fork) | |
606 | { | |
607 | if (print_inferior_events) | |
608 | { | |
609 | /* Ensure that we have a process ptid. */ | |
610 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
611 | ||
612 | target_terminal::ours_for_output (); | |
613 | fprintf_filtered (gdb_stdlog, | |
614 | _("[Detaching after fork from " | |
615 | "parent %s]\n"), | |
616 | target_pid_to_str (process_ptid).c_str ()); | |
617 | } | |
8dd06f7a | 618 | |
5b6d1e4f PA |
619 | target_detach (parent_inf, 0); |
620 | parent_inf = NULL; | |
621 | } | |
6f259a23 | 622 | |
5b6d1e4f | 623 | /* Note that the detach above makes PARENT_INF dangling. */ |
d83ad864 | 624 | |
5b6d1e4f PA |
625 | /* Add the child thread to the appropriate lists, and switch |
626 | to this new thread, before cloning the program space, and | |
627 | informing the solib layer about this new process. */ | |
d83ad864 | 628 | |
5b6d1e4f PA |
629 | set_current_inferior (child_inf); |
630 | push_target (target); | |
631 | } | |
d83ad864 | 632 | |
18493a00 | 633 | thread_info *child_thr = add_thread_silent (target, child_ptid); |
d83ad864 DB |
634 | |
635 | /* If this is a vfork child, then the address-space is shared | |
636 | with the parent. If we detached from the parent, then we can | |
637 | reuse the parent's program/address spaces. */ | |
638 | if (has_vforked || detach_fork) | |
639 | { | |
640 | child_inf->pspace = parent_pspace; | |
641 | child_inf->aspace = child_inf->pspace->aspace; | |
5b6d1e4f PA |
642 | |
643 | exec_on_vfork (); | |
d83ad864 DB |
644 | } |
645 | else | |
646 | { | |
647 | child_inf->aspace = new_address_space (); | |
564b1e3f | 648 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
649 | child_inf->removable = 1; |
650 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
651 | set_current_program_space (child_inf->pspace); | |
652 | clone_program_space (child_inf->pspace, parent_pspace); | |
653 | ||
654 | /* Let the shared library layer (e.g., solib-svr4) learn | |
655 | about this new process, relocate the cloned exec, pull in | |
656 | shared libraries, and install the solib event breakpoint. | |
657 | If a "cloned-VM" event was propagated better throughout | |
658 | the core, this wouldn't be required. */ | |
659 | solib_create_inferior_hook (0); | |
660 | } | |
18493a00 PA |
661 | |
662 | switch_to_thread (child_thr); | |
d83ad864 DB |
663 | } |
664 | ||
665 | return target_follow_fork (follow_child, detach_fork); | |
666 | } | |
667 | ||
e58b0e63 PA |
668 | /* Tell the target to follow the fork we're stopped at. Returns true |
669 | if the inferior should be resumed; false, if the target for some | |
670 | reason decided it's best not to resume. */ | |
671 | ||
5ab2fbf1 SM |
672 | static bool |
673 | follow_fork () | |
c906108c | 674 | { |
5ab2fbf1 SM |
675 | bool follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
676 | bool should_resume = true; | |
e58b0e63 PA |
677 | struct thread_info *tp; |
678 | ||
679 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
680 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
681 | parent thread structure's run control related fields, not just these. |
682 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
683 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 684 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
685 | CORE_ADDR step_range_start = 0; |
686 | CORE_ADDR step_range_end = 0; | |
bf4cb9be TV |
687 | int current_line = 0; |
688 | symtab *current_symtab = NULL; | |
4e3990f4 | 689 | struct frame_id step_frame_id = { 0 }; |
8980e177 | 690 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
691 | |
692 | if (!non_stop) | |
693 | { | |
5b6d1e4f | 694 | process_stratum_target *wait_target; |
e58b0e63 PA |
695 | ptid_t wait_ptid; |
696 | struct target_waitstatus wait_status; | |
697 | ||
698 | /* Get the last target status returned by target_wait(). */ | |
5b6d1e4f | 699 | get_last_target_status (&wait_target, &wait_ptid, &wait_status); |
e58b0e63 PA |
700 | |
701 | /* If not stopped at a fork event, then there's nothing else to | |
702 | do. */ | |
703 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
704 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
705 | return 1; | |
706 | ||
707 | /* Check if we switched over from WAIT_PTID, since the event was | |
708 | reported. */ | |
00431a78 | 709 | if (wait_ptid != minus_one_ptid |
5b6d1e4f PA |
710 | && (current_inferior ()->process_target () != wait_target |
711 | || inferior_ptid != wait_ptid)) | |
e58b0e63 PA |
712 | { |
713 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
714 | target to follow it (in either direction). We'll | |
715 | afterwards refuse to resume, and inform the user what | |
716 | happened. */ | |
5b6d1e4f | 717 | thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid); |
00431a78 | 718 | switch_to_thread (wait_thread); |
5ab2fbf1 | 719 | should_resume = false; |
e58b0e63 PA |
720 | } |
721 | } | |
722 | ||
723 | tp = inferior_thread (); | |
724 | ||
725 | /* If there were any forks/vforks that were caught and are now to be | |
726 | followed, then do so now. */ | |
727 | switch (tp->pending_follow.kind) | |
728 | { | |
729 | case TARGET_WAITKIND_FORKED: | |
730 | case TARGET_WAITKIND_VFORKED: | |
731 | { | |
732 | ptid_t parent, child; | |
733 | ||
734 | /* If the user did a next/step, etc, over a fork call, | |
735 | preserve the stepping state in the fork child. */ | |
736 | if (follow_child && should_resume) | |
737 | { | |
8358c15c JK |
738 | step_resume_breakpoint = clone_momentary_breakpoint |
739 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
740 | step_range_start = tp->control.step_range_start; |
741 | step_range_end = tp->control.step_range_end; | |
bf4cb9be TV |
742 | current_line = tp->current_line; |
743 | current_symtab = tp->current_symtab; | |
16c381f0 | 744 | step_frame_id = tp->control.step_frame_id; |
186c406b TT |
745 | exception_resume_breakpoint |
746 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 747 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
748 | |
749 | /* For now, delete the parent's sr breakpoint, otherwise, | |
750 | parent/child sr breakpoints are considered duplicates, | |
751 | and the child version will not be installed. Remove | |
752 | this when the breakpoints module becomes aware of | |
753 | inferiors and address spaces. */ | |
754 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
755 | tp->control.step_range_start = 0; |
756 | tp->control.step_range_end = 0; | |
757 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 758 | delete_exception_resume_breakpoint (tp); |
8980e177 | 759 | tp->thread_fsm = NULL; |
e58b0e63 PA |
760 | } |
761 | ||
762 | parent = inferior_ptid; | |
763 | child = tp->pending_follow.value.related_pid; | |
764 | ||
5b6d1e4f | 765 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
766 | /* Set up inferior(s) as specified by the caller, and tell the |
767 | target to do whatever is necessary to follow either parent | |
768 | or child. */ | |
769 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
770 | { |
771 | /* Target refused to follow, or there's some other reason | |
772 | we shouldn't resume. */ | |
773 | should_resume = 0; | |
774 | } | |
775 | else | |
776 | { | |
777 | /* This pending follow fork event is now handled, one way | |
778 | or another. The previous selected thread may be gone | |
779 | from the lists by now, but if it is still around, need | |
780 | to clear the pending follow request. */ | |
5b6d1e4f | 781 | tp = find_thread_ptid (parent_targ, parent); |
e58b0e63 PA |
782 | if (tp) |
783 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
784 | ||
785 | /* This makes sure we don't try to apply the "Switched | |
786 | over from WAIT_PID" logic above. */ | |
787 | nullify_last_target_wait_ptid (); | |
788 | ||
1777feb0 | 789 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
790 | if (follow_child) |
791 | { | |
5b6d1e4f | 792 | thread_info *child_thr = find_thread_ptid (parent_targ, child); |
00431a78 | 793 | switch_to_thread (child_thr); |
e58b0e63 PA |
794 | |
795 | /* ... and preserve the stepping state, in case the | |
796 | user was stepping over the fork call. */ | |
797 | if (should_resume) | |
798 | { | |
799 | tp = inferior_thread (); | |
8358c15c JK |
800 | tp->control.step_resume_breakpoint |
801 | = step_resume_breakpoint; | |
16c381f0 JK |
802 | tp->control.step_range_start = step_range_start; |
803 | tp->control.step_range_end = step_range_end; | |
bf4cb9be TV |
804 | tp->current_line = current_line; |
805 | tp->current_symtab = current_symtab; | |
16c381f0 | 806 | tp->control.step_frame_id = step_frame_id; |
186c406b TT |
807 | tp->control.exception_resume_breakpoint |
808 | = exception_resume_breakpoint; | |
8980e177 | 809 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
810 | } |
811 | else | |
812 | { | |
813 | /* If we get here, it was because we're trying to | |
814 | resume from a fork catchpoint, but, the user | |
815 | has switched threads away from the thread that | |
816 | forked. In that case, the resume command | |
817 | issued is most likely not applicable to the | |
818 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 819 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 820 | "before following fork child.")); |
e58b0e63 PA |
821 | } |
822 | ||
823 | /* Reset breakpoints in the child as appropriate. */ | |
824 | follow_inferior_reset_breakpoints (); | |
825 | } | |
e58b0e63 PA |
826 | } |
827 | } | |
828 | break; | |
829 | case TARGET_WAITKIND_SPURIOUS: | |
830 | /* Nothing to follow. */ | |
831 | break; | |
832 | default: | |
833 | internal_error (__FILE__, __LINE__, | |
834 | "Unexpected pending_follow.kind %d\n", | |
835 | tp->pending_follow.kind); | |
836 | break; | |
837 | } | |
c906108c | 838 | |
e58b0e63 | 839 | return should_resume; |
c906108c SS |
840 | } |
841 | ||
d83ad864 | 842 | static void |
6604731b | 843 | follow_inferior_reset_breakpoints (void) |
c906108c | 844 | { |
4e1c45ea PA |
845 | struct thread_info *tp = inferior_thread (); |
846 | ||
6604731b DJ |
847 | /* Was there a step_resume breakpoint? (There was if the user |
848 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
849 | thread number. Cloned step_resume breakpoints are disabled on |
850 | creation, so enable it here now that it is associated with the | |
851 | correct thread. | |
6604731b DJ |
852 | |
853 | step_resumes are a form of bp that are made to be per-thread. | |
854 | Since we created the step_resume bp when the parent process | |
855 | was being debugged, and now are switching to the child process, | |
856 | from the breakpoint package's viewpoint, that's a switch of | |
857 | "threads". We must update the bp's notion of which thread | |
858 | it is for, or it'll be ignored when it triggers. */ | |
859 | ||
8358c15c | 860 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
861 | { |
862 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
863 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
864 | } | |
6604731b | 865 | |
a1aa2221 | 866 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 867 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
868 | { |
869 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
870 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
871 | } | |
186c406b | 872 | |
6604731b DJ |
873 | /* Reinsert all breakpoints in the child. The user may have set |
874 | breakpoints after catching the fork, in which case those | |
875 | were never set in the child, but only in the parent. This makes | |
876 | sure the inserted breakpoints match the breakpoint list. */ | |
877 | ||
878 | breakpoint_re_set (); | |
879 | insert_breakpoints (); | |
c906108c | 880 | } |
c906108c | 881 | |
6c95b8df PA |
882 | /* The child has exited or execed: resume threads of the parent the |
883 | user wanted to be executing. */ | |
884 | ||
885 | static int | |
886 | proceed_after_vfork_done (struct thread_info *thread, | |
887 | void *arg) | |
888 | { | |
889 | int pid = * (int *) arg; | |
890 | ||
00431a78 PA |
891 | if (thread->ptid.pid () == pid |
892 | && thread->state == THREAD_RUNNING | |
893 | && !thread->executing | |
6c95b8df | 894 | && !thread->stop_requested |
a493e3e2 | 895 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df | 896 | { |
1eb8556f SM |
897 | infrun_debug_printf ("resuming vfork parent thread %s", |
898 | target_pid_to_str (thread->ptid).c_str ()); | |
6c95b8df | 899 | |
00431a78 | 900 | switch_to_thread (thread); |
70509625 | 901 | clear_proceed_status (0); |
64ce06e4 | 902 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
903 | } |
904 | ||
905 | return 0; | |
906 | } | |
907 | ||
908 | /* Called whenever we notice an exec or exit event, to handle | |
909 | detaching or resuming a vfork parent. */ | |
910 | ||
911 | static void | |
912 | handle_vfork_child_exec_or_exit (int exec) | |
913 | { | |
914 | struct inferior *inf = current_inferior (); | |
915 | ||
916 | if (inf->vfork_parent) | |
917 | { | |
918 | int resume_parent = -1; | |
919 | ||
920 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
921 | between the parent and the child. Break the bonds. */ |
922 | inferior *vfork_parent = inf->vfork_parent; | |
923 | inf->vfork_parent->vfork_child = NULL; | |
924 | inf->vfork_parent = NULL; | |
6c95b8df | 925 | |
b73715df TV |
926 | /* If the user wanted to detach from the parent, now is the |
927 | time. */ | |
928 | if (vfork_parent->pending_detach) | |
6c95b8df | 929 | { |
6c95b8df PA |
930 | struct program_space *pspace; |
931 | struct address_space *aspace; | |
932 | ||
1777feb0 | 933 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 934 | |
b73715df | 935 | vfork_parent->pending_detach = 0; |
68c9da30 | 936 | |
18493a00 | 937 | scoped_restore_current_pspace_and_thread restore_thread; |
6c95b8df PA |
938 | |
939 | /* We're letting loose of the parent. */ | |
18493a00 | 940 | thread_info *tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 941 | switch_to_thread (tp); |
6c95b8df PA |
942 | |
943 | /* We're about to detach from the parent, which implicitly | |
944 | removes breakpoints from its address space. There's a | |
945 | catch here: we want to reuse the spaces for the child, | |
946 | but, parent/child are still sharing the pspace at this | |
947 | point, although the exec in reality makes the kernel give | |
948 | the child a fresh set of new pages. The problem here is | |
949 | that the breakpoints module being unaware of this, would | |
950 | likely chose the child process to write to the parent | |
951 | address space. Swapping the child temporarily away from | |
952 | the spaces has the desired effect. Yes, this is "sort | |
953 | of" a hack. */ | |
954 | ||
955 | pspace = inf->pspace; | |
956 | aspace = inf->aspace; | |
957 | inf->aspace = NULL; | |
958 | inf->pspace = NULL; | |
959 | ||
f67c0c91 | 960 | if (print_inferior_events) |
6c95b8df | 961 | { |
a068643d | 962 | std::string pidstr |
b73715df | 963 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 964 | |
223ffa71 | 965 | target_terminal::ours_for_output (); |
6c95b8df PA |
966 | |
967 | if (exec) | |
6f259a23 DB |
968 | { |
969 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 970 | _("[Detaching vfork parent %s " |
a068643d | 971 | "after child exec]\n"), pidstr.c_str ()); |
6f259a23 | 972 | } |
6c95b8df | 973 | else |
6f259a23 DB |
974 | { |
975 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 976 | _("[Detaching vfork parent %s " |
a068643d | 977 | "after child exit]\n"), pidstr.c_str ()); |
6f259a23 | 978 | } |
6c95b8df PA |
979 | } |
980 | ||
b73715df | 981 | target_detach (vfork_parent, 0); |
6c95b8df PA |
982 | |
983 | /* Put it back. */ | |
984 | inf->pspace = pspace; | |
985 | inf->aspace = aspace; | |
6c95b8df PA |
986 | } |
987 | else if (exec) | |
988 | { | |
989 | /* We're staying attached to the parent, so, really give the | |
990 | child a new address space. */ | |
564b1e3f | 991 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
992 | inf->aspace = inf->pspace->aspace; |
993 | inf->removable = 1; | |
994 | set_current_program_space (inf->pspace); | |
995 | ||
b73715df | 996 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
997 | } |
998 | else | |
999 | { | |
6c95b8df PA |
1000 | /* If this is a vfork child exiting, then the pspace and |
1001 | aspaces were shared with the parent. Since we're | |
1002 | reporting the process exit, we'll be mourning all that is | |
1003 | found in the address space, and switching to null_ptid, | |
1004 | preparing to start a new inferior. But, since we don't | |
1005 | want to clobber the parent's address/program spaces, we | |
1006 | go ahead and create a new one for this exiting | |
1007 | inferior. */ | |
1008 | ||
18493a00 | 1009 | /* Switch to no-thread while running clone_program_space, so |
5ed8105e PA |
1010 | that clone_program_space doesn't want to read the |
1011 | selected frame of a dead process. */ | |
18493a00 PA |
1012 | scoped_restore_current_thread restore_thread; |
1013 | switch_to_no_thread (); | |
6c95b8df | 1014 | |
53af73bf PA |
1015 | inf->pspace = new program_space (maybe_new_address_space ()); |
1016 | inf->aspace = inf->pspace->aspace; | |
1017 | set_current_program_space (inf->pspace); | |
6c95b8df | 1018 | inf->removable = 1; |
7dcd53a0 | 1019 | inf->symfile_flags = SYMFILE_NO_READ; |
53af73bf | 1020 | clone_program_space (inf->pspace, vfork_parent->pspace); |
6c95b8df | 1021 | |
b73715df | 1022 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1023 | } |
1024 | ||
6c95b8df PA |
1025 | gdb_assert (current_program_space == inf->pspace); |
1026 | ||
1027 | if (non_stop && resume_parent != -1) | |
1028 | { | |
1029 | /* If the user wanted the parent to be running, let it go | |
1030 | free now. */ | |
5ed8105e | 1031 | scoped_restore_current_thread restore_thread; |
6c95b8df | 1032 | |
1eb8556f SM |
1033 | infrun_debug_printf ("resuming vfork parent process %d", |
1034 | resume_parent); | |
6c95b8df PA |
1035 | |
1036 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1037 | } |
1038 | } | |
1039 | } | |
1040 | ||
eb6c553b | 1041 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1042 | |
1043 | static const char follow_exec_mode_new[] = "new"; | |
1044 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1045 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1046 | { |
1047 | follow_exec_mode_new, | |
1048 | follow_exec_mode_same, | |
1049 | NULL, | |
1050 | }; | |
1051 | ||
1052 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1053 | static void | |
1054 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1055 | struct cmd_list_element *c, const char *value) | |
1056 | { | |
1057 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1058 | } | |
1059 | ||
ecf45d2c | 1060 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1061 | |
c906108c | 1062 | static void |
4ca51187 | 1063 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1064 | { |
6c95b8df | 1065 | struct inferior *inf = current_inferior (); |
e99b03dc | 1066 | int pid = ptid.pid (); |
94585166 | 1067 | ptid_t process_ptid; |
7a292a7a | 1068 | |
65d2b333 PW |
1069 | /* Switch terminal for any messages produced e.g. by |
1070 | breakpoint_re_set. */ | |
1071 | target_terminal::ours_for_output (); | |
1072 | ||
c906108c SS |
1073 | /* This is an exec event that we actually wish to pay attention to. |
1074 | Refresh our symbol table to the newly exec'd program, remove any | |
1075 | momentary bp's, etc. | |
1076 | ||
1077 | If there are breakpoints, they aren't really inserted now, | |
1078 | since the exec() transformed our inferior into a fresh set | |
1079 | of instructions. | |
1080 | ||
1081 | We want to preserve symbolic breakpoints on the list, since | |
1082 | we have hopes that they can be reset after the new a.out's | |
1083 | symbol table is read. | |
1084 | ||
1085 | However, any "raw" breakpoints must be removed from the list | |
1086 | (e.g., the solib bp's), since their address is probably invalid | |
1087 | now. | |
1088 | ||
1089 | And, we DON'T want to call delete_breakpoints() here, since | |
1090 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1091 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1092 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1093 | |
1094 | mark_breakpoints_out (); | |
1095 | ||
95e50b27 PA |
1096 | /* The target reports the exec event to the main thread, even if |
1097 | some other thread does the exec, and even if the main thread was | |
1098 | stopped or already gone. We may still have non-leader threads of | |
1099 | the process on our list. E.g., on targets that don't have thread | |
1100 | exit events (like remote); or on native Linux in non-stop mode if | |
1101 | there were only two threads in the inferior and the non-leader | |
1102 | one is the one that execs (and nothing forces an update of the | |
1103 | thread list up to here). When debugging remotely, it's best to | |
1104 | avoid extra traffic, when possible, so avoid syncing the thread | |
1105 | list with the target, and instead go ahead and delete all threads | |
1106 | of the process but one that reported the event. Note this must | |
1107 | be done before calling update_breakpoints_after_exec, as | |
1108 | otherwise clearing the threads' resources would reference stale | |
1109 | thread breakpoints -- it may have been one of these threads that | |
1110 | stepped across the exec. We could just clear their stepping | |
1111 | states, but as long as we're iterating, might as well delete | |
1112 | them. Deleting them now rather than at the next user-visible | |
1113 | stop provides a nicer sequence of events for user and MI | |
1114 | notifications. */ | |
08036331 | 1115 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1116 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1117 | delete_thread (th); |
95e50b27 PA |
1118 | |
1119 | /* We also need to clear any left over stale state for the | |
1120 | leader/event thread. E.g., if there was any step-resume | |
1121 | breakpoint or similar, it's gone now. We cannot truly | |
1122 | step-to-next statement through an exec(). */ | |
08036331 | 1123 | thread_info *th = inferior_thread (); |
8358c15c | 1124 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1125 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1126 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1127 | th->control.step_range_start = 0; |
1128 | th->control.step_range_end = 0; | |
c906108c | 1129 | |
95e50b27 PA |
1130 | /* The user may have had the main thread held stopped in the |
1131 | previous image (e.g., schedlock on, or non-stop). Release | |
1132 | it now. */ | |
a75724bc PA |
1133 | th->stop_requested = 0; |
1134 | ||
95e50b27 PA |
1135 | update_breakpoints_after_exec (); |
1136 | ||
1777feb0 | 1137 | /* What is this a.out's name? */ |
f2907e49 | 1138 | process_ptid = ptid_t (pid); |
6c95b8df | 1139 | printf_unfiltered (_("%s is executing new program: %s\n"), |
a068643d | 1140 | target_pid_to_str (process_ptid).c_str (), |
ecf45d2c | 1141 | exec_file_target); |
c906108c SS |
1142 | |
1143 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1144 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1145 | |
6ca15a4b | 1146 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1147 | |
797bc1cb TT |
1148 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1149 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1150 | |
ecf45d2c SL |
1151 | /* If we were unable to map the executable target pathname onto a host |
1152 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1153 | is confusing. Maybe it would even be better to stop at this point | |
1154 | so that the user can specify a file manually before continuing. */ | |
1155 | if (exec_file_host == NULL) | |
1156 | warning (_("Could not load symbols for executable %s.\n" | |
1157 | "Do you need \"set sysroot\"?"), | |
1158 | exec_file_target); | |
c906108c | 1159 | |
cce9b6bf PA |
1160 | /* Reset the shared library package. This ensures that we get a |
1161 | shlib event when the child reaches "_start", at which point the | |
1162 | dld will have had a chance to initialize the child. */ | |
1163 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1164 | we don't want those to be satisfied by the libraries of the | |
1165 | previous incarnation of this process. */ | |
1166 | no_shared_libraries (NULL, 0); | |
1167 | ||
6c95b8df PA |
1168 | if (follow_exec_mode_string == follow_exec_mode_new) |
1169 | { | |
6c95b8df PA |
1170 | /* The user wants to keep the old inferior and program spaces |
1171 | around. Create a new fresh one, and switch to it. */ | |
1172 | ||
35ed81d4 SM |
1173 | /* Do exit processing for the original inferior before setting the new |
1174 | inferior's pid. Having two inferiors with the same pid would confuse | |
1175 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1176 | old to the new inferior. */ | |
1177 | inf = add_inferior_with_spaces (); | |
1178 | swap_terminal_info (inf, current_inferior ()); | |
057302ce | 1179 | exit_inferior_silent (current_inferior ()); |
17d8546e | 1180 | |
94585166 | 1181 | inf->pid = pid; |
ecf45d2c | 1182 | target_follow_exec (inf, exec_file_target); |
6c95b8df | 1183 | |
5b6d1e4f PA |
1184 | inferior *org_inferior = current_inferior (); |
1185 | switch_to_inferior_no_thread (inf); | |
1186 | push_target (org_inferior->process_target ()); | |
1187 | thread_info *thr = add_thread (inf->process_target (), ptid); | |
1188 | switch_to_thread (thr); | |
6c95b8df | 1189 | } |
9107fc8d PA |
1190 | else |
1191 | { | |
1192 | /* The old description may no longer be fit for the new image. | |
1193 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1194 | old description; we'll read a new one below. No need to do | |
1195 | this on "follow-exec-mode new", as the old inferior stays | |
1196 | around (its description is later cleared/refetched on | |
1197 | restart). */ | |
1198 | target_clear_description (); | |
1199 | } | |
6c95b8df PA |
1200 | |
1201 | gdb_assert (current_program_space == inf->pspace); | |
1202 | ||
ecf45d2c SL |
1203 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1204 | because the proper displacement for a PIE (Position Independent | |
1205 | Executable) main symbol file will only be computed by | |
1206 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1207 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1208 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1209 | |
9107fc8d PA |
1210 | /* If the target can specify a description, read it. Must do this |
1211 | after flipping to the new executable (because the target supplied | |
1212 | description must be compatible with the executable's | |
1213 | architecture, and the old executable may e.g., be 32-bit, while | |
1214 | the new one 64-bit), and before anything involving memory or | |
1215 | registers. */ | |
1216 | target_find_description (); | |
1217 | ||
42a4fec5 | 1218 | gdb::observers::inferior_execd.notify (inf); |
4efc6507 | 1219 | |
c1e56572 JK |
1220 | breakpoint_re_set (); |
1221 | ||
c906108c SS |
1222 | /* Reinsert all breakpoints. (Those which were symbolic have |
1223 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1224 | to symbol_file_command...). */ |
c906108c SS |
1225 | insert_breakpoints (); |
1226 | ||
1227 | /* The next resume of this inferior should bring it to the shlib | |
1228 | startup breakpoints. (If the user had also set bp's on | |
1229 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1230 | matically get reset there in the new process.). */ |
c906108c SS |
1231 | } |
1232 | ||
28d5518b | 1233 | /* The chain of threads that need to do a step-over operation to get |
c2829269 PA |
1234 | past e.g., a breakpoint. What technique is used to step over the |
1235 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1236 | same queue, to maintain rough temporal order of execution, in order | |
1237 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1238 | constantly stepping the same couple threads past their breakpoints | |
1239 | over and over, if the single-step finish fast enough. */ | |
28d5518b | 1240 | struct thread_info *global_thread_step_over_chain_head; |
c2829269 | 1241 | |
6c4cfb24 PA |
1242 | /* Bit flags indicating what the thread needs to step over. */ |
1243 | ||
8d297bbf | 1244 | enum step_over_what_flag |
6c4cfb24 PA |
1245 | { |
1246 | /* Step over a breakpoint. */ | |
1247 | STEP_OVER_BREAKPOINT = 1, | |
1248 | ||
1249 | /* Step past a non-continuable watchpoint, in order to let the | |
1250 | instruction execute so we can evaluate the watchpoint | |
1251 | expression. */ | |
1252 | STEP_OVER_WATCHPOINT = 2 | |
1253 | }; | |
8d297bbf | 1254 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1255 | |
963f9c80 | 1256 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1257 | |
1258 | struct step_over_info | |
1259 | { | |
963f9c80 PA |
1260 | /* If we're stepping past a breakpoint, this is the address space |
1261 | and address of the instruction the breakpoint is set at. We'll | |
1262 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1263 | non-NULL. */ | |
ac7d717c PA |
1264 | const address_space *aspace = nullptr; |
1265 | CORE_ADDR address = 0; | |
963f9c80 PA |
1266 | |
1267 | /* The instruction being stepped over triggers a nonsteppable | |
1268 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
ac7d717c | 1269 | int nonsteppable_watchpoint_p = 0; |
21edc42f YQ |
1270 | |
1271 | /* The thread's global number. */ | |
ac7d717c | 1272 | int thread = -1; |
31e77af2 PA |
1273 | }; |
1274 | ||
1275 | /* The step-over info of the location that is being stepped over. | |
1276 | ||
1277 | Note that with async/breakpoint always-inserted mode, a user might | |
1278 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1279 | being stepped over. As setting a new breakpoint inserts all | |
1280 | breakpoints, we need to make sure the breakpoint being stepped over | |
1281 | isn't inserted then. We do that by only clearing the step-over | |
1282 | info when the step-over is actually finished (or aborted). | |
1283 | ||
1284 | Presently GDB can only step over one breakpoint at any given time. | |
1285 | Given threads that can't run code in the same address space as the | |
1286 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1287 | to step-over at most one breakpoint per address space (so this info | |
1288 | could move to the address space object if/when GDB is extended). | |
1289 | The set of breakpoints being stepped over will normally be much | |
1290 | smaller than the set of all breakpoints, so a flag in the | |
1291 | breakpoint location structure would be wasteful. A separate list | |
1292 | also saves complexity and run-time, as otherwise we'd have to go | |
1293 | through all breakpoint locations clearing their flag whenever we | |
1294 | start a new sequence. Similar considerations weigh against storing | |
1295 | this info in the thread object. Plus, not all step overs actually | |
1296 | have breakpoint locations -- e.g., stepping past a single-step | |
1297 | breakpoint, or stepping to complete a non-continuable | |
1298 | watchpoint. */ | |
1299 | static struct step_over_info step_over_info; | |
1300 | ||
1301 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1302 | stepping over. |
1303 | N.B. We record the aspace and address now, instead of say just the thread, | |
1304 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1305 | |
1306 | static void | |
8b86c959 | 1307 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1308 | int nonsteppable_watchpoint_p, |
1309 | int thread) | |
31e77af2 PA |
1310 | { |
1311 | step_over_info.aspace = aspace; | |
1312 | step_over_info.address = address; | |
963f9c80 | 1313 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1314 | step_over_info.thread = thread; |
31e77af2 PA |
1315 | } |
1316 | ||
1317 | /* Called when we're not longer stepping over a breakpoint / an | |
1318 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1319 | ||
1320 | static void | |
1321 | clear_step_over_info (void) | |
1322 | { | |
1eb8556f | 1323 | infrun_debug_printf ("clearing step over info"); |
31e77af2 PA |
1324 | step_over_info.aspace = NULL; |
1325 | step_over_info.address = 0; | |
963f9c80 | 1326 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1327 | step_over_info.thread = -1; |
31e77af2 PA |
1328 | } |
1329 | ||
7f89fd65 | 1330 | /* See infrun.h. */ |
31e77af2 PA |
1331 | |
1332 | int | |
1333 | stepping_past_instruction_at (struct address_space *aspace, | |
1334 | CORE_ADDR address) | |
1335 | { | |
1336 | return (step_over_info.aspace != NULL | |
1337 | && breakpoint_address_match (aspace, address, | |
1338 | step_over_info.aspace, | |
1339 | step_over_info.address)); | |
1340 | } | |
1341 | ||
963f9c80 PA |
1342 | /* See infrun.h. */ |
1343 | ||
21edc42f YQ |
1344 | int |
1345 | thread_is_stepping_over_breakpoint (int thread) | |
1346 | { | |
1347 | return (step_over_info.thread != -1 | |
1348 | && thread == step_over_info.thread); | |
1349 | } | |
1350 | ||
1351 | /* See infrun.h. */ | |
1352 | ||
963f9c80 PA |
1353 | int |
1354 | stepping_past_nonsteppable_watchpoint (void) | |
1355 | { | |
1356 | return step_over_info.nonsteppable_watchpoint_p; | |
1357 | } | |
1358 | ||
6cc83d2a PA |
1359 | /* Returns true if step-over info is valid. */ |
1360 | ||
c4464ade | 1361 | static bool |
6cc83d2a PA |
1362 | step_over_info_valid_p (void) |
1363 | { | |
963f9c80 PA |
1364 | return (step_over_info.aspace != NULL |
1365 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1366 | } |
1367 | ||
c906108c | 1368 | \f |
237fc4c9 PA |
1369 | /* Displaced stepping. */ |
1370 | ||
1371 | /* In non-stop debugging mode, we must take special care to manage | |
1372 | breakpoints properly; in particular, the traditional strategy for | |
1373 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1374 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1375 | breakpoint it has hit while ensuring that other threads running | |
1376 | concurrently will hit the breakpoint as they should. | |
1377 | ||
1378 | The traditional way to step a thread T off a breakpoint in a | |
1379 | multi-threaded program in all-stop mode is as follows: | |
1380 | ||
1381 | a0) Initially, all threads are stopped, and breakpoints are not | |
1382 | inserted. | |
1383 | a1) We single-step T, leaving breakpoints uninserted. | |
1384 | a2) We insert breakpoints, and resume all threads. | |
1385 | ||
1386 | In non-stop debugging, however, this strategy is unsuitable: we | |
1387 | don't want to have to stop all threads in the system in order to | |
1388 | continue or step T past a breakpoint. Instead, we use displaced | |
1389 | stepping: | |
1390 | ||
1391 | n0) Initially, T is stopped, other threads are running, and | |
1392 | breakpoints are inserted. | |
1393 | n1) We copy the instruction "under" the breakpoint to a separate | |
1394 | location, outside the main code stream, making any adjustments | |
1395 | to the instruction, register, and memory state as directed by | |
1396 | T's architecture. | |
1397 | n2) We single-step T over the instruction at its new location. | |
1398 | n3) We adjust the resulting register and memory state as directed | |
1399 | by T's architecture. This includes resetting T's PC to point | |
1400 | back into the main instruction stream. | |
1401 | n4) We resume T. | |
1402 | ||
1403 | This approach depends on the following gdbarch methods: | |
1404 | ||
1405 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1406 | indicate where to copy the instruction, and how much space must | |
1407 | be reserved there. We use these in step n1. | |
1408 | ||
1409 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1410 | address, and makes any necessary adjustments to the instruction, | |
1411 | register contents, and memory. We use this in step n1. | |
1412 | ||
1413 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1414 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1415 | same effect the instruction would have had if we had executed it |
1416 | at its original address. We use this in step n3. | |
1417 | ||
237fc4c9 PA |
1418 | The gdbarch_displaced_step_copy_insn and |
1419 | gdbarch_displaced_step_fixup functions must be written so that | |
1420 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1421 | single-stepping across the copied instruction, and then applying | |
1422 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1423 | thread's memory and registers as stepping the instruction in place | |
1424 | would have. Exactly which responsibilities fall to the copy and | |
1425 | which fall to the fixup is up to the author of those functions. | |
1426 | ||
1427 | See the comments in gdbarch.sh for details. | |
1428 | ||
1429 | Note that displaced stepping and software single-step cannot | |
1430 | currently be used in combination, although with some care I think | |
1431 | they could be made to. Software single-step works by placing | |
1432 | breakpoints on all possible subsequent instructions; if the | |
1433 | displaced instruction is a PC-relative jump, those breakpoints | |
1434 | could fall in very strange places --- on pages that aren't | |
1435 | executable, or at addresses that are not proper instruction | |
1436 | boundaries. (We do generally let other threads run while we wait | |
1437 | to hit the software single-step breakpoint, and they might | |
1438 | encounter such a corrupted instruction.) One way to work around | |
1439 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1440 | simulate the effect of PC-relative instructions (and return NULL) | |
1441 | on architectures that use software single-stepping. | |
1442 | ||
1443 | In non-stop mode, we can have independent and simultaneous step | |
1444 | requests, so more than one thread may need to simultaneously step | |
1445 | over a breakpoint. The current implementation assumes there is | |
1446 | only one scratch space per process. In this case, we have to | |
1447 | serialize access to the scratch space. If thread A wants to step | |
1448 | over a breakpoint, but we are currently waiting for some other | |
1449 | thread to complete a displaced step, we leave thread A stopped and | |
1450 | place it in the displaced_step_request_queue. Whenever a displaced | |
1451 | step finishes, we pick the next thread in the queue and start a new | |
1452 | displaced step operation on it. See displaced_step_prepare and | |
7def77a1 | 1453 | displaced_step_finish for details. */ |
237fc4c9 | 1454 | |
a46d1843 | 1455 | /* Return true if THREAD is doing a displaced step. */ |
c0987663 | 1456 | |
c4464ade | 1457 | static bool |
00431a78 | 1458 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1459 | { |
00431a78 | 1460 | gdb_assert (thread != NULL); |
c0987663 | 1461 | |
187b041e | 1462 | return thread->displaced_step_state.in_progress (); |
c0987663 YQ |
1463 | } |
1464 | ||
a46d1843 | 1465 | /* Return true if INF has a thread doing a displaced step. */ |
8f572e5c | 1466 | |
c4464ade | 1467 | static bool |
00431a78 | 1468 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1469 | { |
187b041e | 1470 | return inf->displaced_step_state.in_progress_count > 0; |
fc1cf338 PA |
1471 | } |
1472 | ||
187b041e | 1473 | /* Return true if any thread is doing a displaced step. */ |
a42244db | 1474 | |
187b041e SM |
1475 | static bool |
1476 | displaced_step_in_progress_any_thread () | |
a42244db | 1477 | { |
187b041e SM |
1478 | for (inferior *inf : all_non_exited_inferiors ()) |
1479 | { | |
1480 | if (displaced_step_in_progress (inf)) | |
1481 | return true; | |
1482 | } | |
a42244db | 1483 | |
187b041e | 1484 | return false; |
a42244db YQ |
1485 | } |
1486 | ||
fc1cf338 PA |
1487 | static void |
1488 | infrun_inferior_exit (struct inferior *inf) | |
1489 | { | |
d20172fc | 1490 | inf->displaced_step_state.reset (); |
fc1cf338 | 1491 | } |
237fc4c9 | 1492 | |
3b7a962d SM |
1493 | static void |
1494 | infrun_inferior_execd (inferior *inf) | |
1495 | { | |
187b041e SM |
1496 | /* If some threads where was doing a displaced step in this inferior at the |
1497 | moment of the exec, they no longer exist. Even if the exec'ing thread | |
3b7a962d SM |
1498 | doing a displaced step, we don't want to to any fixup nor restore displaced |
1499 | stepping buffer bytes. */ | |
1500 | inf->displaced_step_state.reset (); | |
1501 | ||
187b041e SM |
1502 | for (thread_info *thread : inf->threads ()) |
1503 | thread->displaced_step_state.reset (); | |
1504 | ||
3b7a962d SM |
1505 | /* Since an in-line step is done with everything else stopped, if there was |
1506 | one in progress at the time of the exec, it must have been the exec'ing | |
1507 | thread. */ | |
1508 | clear_step_over_info (); | |
1509 | } | |
1510 | ||
fff08868 HZ |
1511 | /* If ON, and the architecture supports it, GDB will use displaced |
1512 | stepping to step over breakpoints. If OFF, or if the architecture | |
1513 | doesn't support it, GDB will instead use the traditional | |
1514 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1515 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1516 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1517 | |
72d0e2c5 | 1518 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1519 | |
237fc4c9 PA |
1520 | static void |
1521 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1522 | struct cmd_list_element *c, | |
1523 | const char *value) | |
1524 | { | |
72d0e2c5 | 1525 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1526 | fprintf_filtered (file, |
1527 | _("Debugger's willingness to use displaced stepping " | |
1528 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1529 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1530 | else |
3e43a32a MS |
1531 | fprintf_filtered (file, |
1532 | _("Debugger's willingness to use displaced stepping " | |
1533 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1534 | } |
1535 | ||
9822cb57 SM |
1536 | /* Return true if the gdbarch implements the required methods to use |
1537 | displaced stepping. */ | |
1538 | ||
1539 | static bool | |
1540 | gdbarch_supports_displaced_stepping (gdbarch *arch) | |
1541 | { | |
187b041e SM |
1542 | /* Only check for the presence of `prepare`. The gdbarch verification ensures |
1543 | that if `prepare` is provided, so is `finish`. */ | |
1544 | return gdbarch_displaced_step_prepare_p (arch); | |
9822cb57 SM |
1545 | } |
1546 | ||
fff08868 | 1547 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1548 | over breakpoints of thread TP. */ |
fff08868 | 1549 | |
9822cb57 SM |
1550 | static bool |
1551 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1552 | { |
9822cb57 SM |
1553 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1554 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1555 | return false; | |
1556 | ||
1557 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1558 | way. */ | |
1559 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1560 | && !target_is_non_stop_p ()) | |
1561 | return false; | |
1562 | ||
1563 | gdbarch *gdbarch = get_thread_regcache (tp)->arch (); | |
1564 | ||
1565 | /* If the architecture doesn't implement displaced stepping, don't use | |
1566 | it. */ | |
1567 | if (!gdbarch_supports_displaced_stepping (gdbarch)) | |
1568 | return false; | |
1569 | ||
1570 | /* If recording, don't use displaced stepping. */ | |
1571 | if (find_record_target () != nullptr) | |
1572 | return false; | |
1573 | ||
9822cb57 SM |
1574 | /* If displaced stepping failed before for this inferior, don't bother trying |
1575 | again. */ | |
f5f01699 | 1576 | if (tp->inf->displaced_step_state.failed_before) |
9822cb57 SM |
1577 | return false; |
1578 | ||
1579 | return true; | |
237fc4c9 PA |
1580 | } |
1581 | ||
187b041e | 1582 | /* Simple function wrapper around displaced_step_thread_state::reset. */ |
d8d83535 | 1583 | |
237fc4c9 | 1584 | static void |
187b041e | 1585 | displaced_step_reset (displaced_step_thread_state *displaced) |
237fc4c9 | 1586 | { |
d8d83535 | 1587 | displaced->reset (); |
237fc4c9 PA |
1588 | } |
1589 | ||
d8d83535 SM |
1590 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1591 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1592 | ||
1593 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 | 1594 | |
136821d9 SM |
1595 | /* See infrun.h. */ |
1596 | ||
1597 | std::string | |
1598 | displaced_step_dump_bytes (const gdb_byte *buf, size_t len) | |
237fc4c9 | 1599 | { |
136821d9 | 1600 | std::string ret; |
237fc4c9 | 1601 | |
136821d9 SM |
1602 | for (size_t i = 0; i < len; i++) |
1603 | { | |
1604 | if (i == 0) | |
1605 | ret += string_printf ("%02x", buf[i]); | |
1606 | else | |
1607 | ret += string_printf (" %02x", buf[i]); | |
1608 | } | |
1609 | ||
1610 | return ret; | |
237fc4c9 PA |
1611 | } |
1612 | ||
1613 | /* Prepare to single-step, using displaced stepping. | |
1614 | ||
1615 | Note that we cannot use displaced stepping when we have a signal to | |
1616 | deliver. If we have a signal to deliver and an instruction to step | |
1617 | over, then after the step, there will be no indication from the | |
1618 | target whether the thread entered a signal handler or ignored the | |
1619 | signal and stepped over the instruction successfully --- both cases | |
1620 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1621 | fixup, and in the second case we must --- but we can't tell which. | |
1622 | Comments in the code for 'random signals' in handle_inferior_event | |
1623 | explain how we handle this case instead. | |
1624 | ||
bab37966 SM |
1625 | Returns DISPLACED_STEP_PREPARE_STATUS_OK if preparing was successful -- this |
1626 | thread is going to be stepped now; DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE | |
1627 | if displaced stepping this thread got queued; or | |
1628 | DISPLACED_STEP_PREPARE_STATUS_CANT if this instruction can't be displaced | |
1629 | stepped. */ | |
7f03bd92 | 1630 | |
bab37966 | 1631 | static displaced_step_prepare_status |
00431a78 | 1632 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1633 | { |
00431a78 | 1634 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1635 | struct gdbarch *gdbarch = regcache->arch (); |
187b041e SM |
1636 | displaced_step_thread_state &disp_step_thread_state |
1637 | = tp->displaced_step_state; | |
237fc4c9 PA |
1638 | |
1639 | /* We should never reach this function if the architecture does not | |
1640 | support displaced stepping. */ | |
9822cb57 | 1641 | gdb_assert (gdbarch_supports_displaced_stepping (gdbarch)); |
237fc4c9 | 1642 | |
c2829269 PA |
1643 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1644 | gdb_assert (tp->control.trap_expected); | |
1645 | ||
c1e36e3e PA |
1646 | /* Disable range stepping while executing in the scratch pad. We |
1647 | want a single-step even if executing the displaced instruction in | |
1648 | the scratch buffer lands within the stepping range (e.g., a | |
1649 | jump/branch). */ | |
1650 | tp->control.may_range_step = 0; | |
1651 | ||
187b041e SM |
1652 | /* We are about to start a displaced step for this thread. If one is already |
1653 | in progress, something's wrong. */ | |
1654 | gdb_assert (!disp_step_thread_state.in_progress ()); | |
237fc4c9 | 1655 | |
187b041e | 1656 | if (tp->inf->displaced_step_state.unavailable) |
237fc4c9 | 1657 | { |
187b041e SM |
1658 | /* The gdbarch tells us it's not worth asking to try a prepare because |
1659 | it is likely that it will return unavailable, so don't bother asking. */ | |
237fc4c9 | 1660 | |
136821d9 SM |
1661 | displaced_debug_printf ("deferring step of %s", |
1662 | target_pid_to_str (tp->ptid).c_str ()); | |
237fc4c9 | 1663 | |
28d5518b | 1664 | global_thread_step_over_chain_enqueue (tp); |
bab37966 | 1665 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; |
237fc4c9 | 1666 | } |
237fc4c9 | 1667 | |
187b041e SM |
1668 | displaced_debug_printf ("displaced-stepping %s now", |
1669 | target_pid_to_str (tp->ptid).c_str ()); | |
237fc4c9 | 1670 | |
00431a78 PA |
1671 | scoped_restore_current_thread restore_thread; |
1672 | ||
1673 | switch_to_thread (tp); | |
ad53cd71 | 1674 | |
187b041e SM |
1675 | CORE_ADDR original_pc = regcache_read_pc (regcache); |
1676 | CORE_ADDR displaced_pc; | |
237fc4c9 | 1677 | |
187b041e SM |
1678 | displaced_step_prepare_status status |
1679 | = gdbarch_displaced_step_prepare (gdbarch, tp, displaced_pc); | |
237fc4c9 | 1680 | |
187b041e | 1681 | if (status == DISPLACED_STEP_PREPARE_STATUS_CANT) |
d35ae833 | 1682 | { |
187b041e SM |
1683 | displaced_debug_printf ("failed to prepare (%s)", |
1684 | target_pid_to_str (tp->ptid).c_str ()); | |
d35ae833 | 1685 | |
bab37966 | 1686 | return DISPLACED_STEP_PREPARE_STATUS_CANT; |
d35ae833 | 1687 | } |
187b041e | 1688 | else if (status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
7f03bd92 | 1689 | { |
187b041e SM |
1690 | /* Not enough displaced stepping resources available, defer this |
1691 | request by placing it the queue. */ | |
1692 | ||
1693 | displaced_debug_printf ("not enough resources available, " | |
1694 | "deferring step of %s", | |
1695 | target_pid_to_str (tp->ptid).c_str ()); | |
1696 | ||
1697 | global_thread_step_over_chain_enqueue (tp); | |
1698 | ||
1699 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; | |
7f03bd92 | 1700 | } |
237fc4c9 | 1701 | |
187b041e SM |
1702 | gdb_assert (status == DISPLACED_STEP_PREPARE_STATUS_OK); |
1703 | ||
9f5a595d UW |
1704 | /* Save the information we need to fix things up if the step |
1705 | succeeds. */ | |
187b041e | 1706 | disp_step_thread_state.set (gdbarch); |
9f5a595d | 1707 | |
187b041e | 1708 | tp->inf->displaced_step_state.in_progress_count++; |
ad53cd71 | 1709 | |
187b041e SM |
1710 | displaced_debug_printf ("prepared successfully thread=%s, " |
1711 | "original_pc=%s, displaced_pc=%s", | |
1712 | target_pid_to_str (tp->ptid).c_str (), | |
1713 | paddress (gdbarch, original_pc), | |
1714 | paddress (gdbarch, displaced_pc)); | |
237fc4c9 | 1715 | |
bab37966 | 1716 | return DISPLACED_STEP_PREPARE_STATUS_OK; |
237fc4c9 PA |
1717 | } |
1718 | ||
3fc8eb30 PA |
1719 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1720 | attempts at displaced stepping if we get a memory error. */ | |
1721 | ||
bab37966 | 1722 | static displaced_step_prepare_status |
00431a78 | 1723 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 | 1724 | { |
bab37966 SM |
1725 | displaced_step_prepare_status status |
1726 | = DISPLACED_STEP_PREPARE_STATUS_CANT; | |
3fc8eb30 | 1727 | |
a70b8144 | 1728 | try |
3fc8eb30 | 1729 | { |
bab37966 | 1730 | status = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1731 | } |
230d2906 | 1732 | catch (const gdb_exception_error &ex) |
3fc8eb30 | 1733 | { |
16b41842 PA |
1734 | if (ex.error != MEMORY_ERROR |
1735 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1736 | throw; |
3fc8eb30 | 1737 | |
1eb8556f SM |
1738 | infrun_debug_printf ("caught exception, disabling displaced stepping: %s", |
1739 | ex.what ()); | |
3fc8eb30 PA |
1740 | |
1741 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1742 | "auto". */ | |
1743 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1744 | { | |
fd7dcb94 | 1745 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1746 | ex.what ()); |
3fc8eb30 PA |
1747 | } |
1748 | ||
1749 | /* Disable further displaced stepping attempts. */ | |
f5f01699 | 1750 | thread->inf->displaced_step_state.failed_before = 1; |
3fc8eb30 | 1751 | } |
3fc8eb30 | 1752 | |
bab37966 | 1753 | return status; |
3fc8eb30 PA |
1754 | } |
1755 | ||
bab37966 SM |
1756 | /* If we displaced stepped an instruction successfully, adjust registers and |
1757 | memory to yield the same effect the instruction would have had if we had | |
1758 | executed it at its original address, and return | |
1759 | DISPLACED_STEP_FINISH_STATUS_OK. If the instruction didn't complete, | |
1760 | relocate the PC and return DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED. | |
372316f1 | 1761 | |
bab37966 SM |
1762 | If the thread wasn't displaced stepping, return |
1763 | DISPLACED_STEP_FINISH_STATUS_OK as well. */ | |
1764 | ||
1765 | static displaced_step_finish_status | |
7def77a1 | 1766 | displaced_step_finish (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1767 | { |
187b041e | 1768 | displaced_step_thread_state *displaced = &event_thread->displaced_step_state; |
fc1cf338 | 1769 | |
187b041e SM |
1770 | /* Was this thread performing a displaced step? */ |
1771 | if (!displaced->in_progress ()) | |
bab37966 | 1772 | return DISPLACED_STEP_FINISH_STATUS_OK; |
237fc4c9 | 1773 | |
187b041e SM |
1774 | gdb_assert (event_thread->inf->displaced_step_state.in_progress_count > 0); |
1775 | event_thread->inf->displaced_step_state.in_progress_count--; | |
1776 | ||
cb71640d PA |
1777 | /* Fixup may need to read memory/registers. Switch to the thread |
1778 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
d43b7a2d TBA |
1779 | the current thread, and displaced_step_restore performs ptid-dependent |
1780 | memory accesses using current_inferior() and current_top_target(). */ | |
00431a78 | 1781 | switch_to_thread (event_thread); |
cb71640d | 1782 | |
d43b7a2d TBA |
1783 | displaced_step_reset_cleanup cleanup (displaced); |
1784 | ||
187b041e SM |
1785 | /* Do the fixup, and release the resources acquired to do the displaced |
1786 | step. */ | |
1787 | return gdbarch_displaced_step_finish (displaced->get_original_gdbarch (), | |
1788 | event_thread, signal); | |
c2829269 | 1789 | } |
1c5cfe86 | 1790 | |
4d9d9d04 PA |
1791 | /* Data to be passed around while handling an event. This data is |
1792 | discarded between events. */ | |
1793 | struct execution_control_state | |
1794 | { | |
5b6d1e4f | 1795 | process_stratum_target *target; |
4d9d9d04 PA |
1796 | ptid_t ptid; |
1797 | /* The thread that got the event, if this was a thread event; NULL | |
1798 | otherwise. */ | |
1799 | struct thread_info *event_thread; | |
1800 | ||
1801 | struct target_waitstatus ws; | |
1802 | int stop_func_filled_in; | |
1803 | CORE_ADDR stop_func_start; | |
1804 | CORE_ADDR stop_func_end; | |
1805 | const char *stop_func_name; | |
1806 | int wait_some_more; | |
1807 | ||
1808 | /* True if the event thread hit the single-step breakpoint of | |
1809 | another thread. Thus the event doesn't cause a stop, the thread | |
1810 | needs to be single-stepped past the single-step breakpoint before | |
1811 | we can switch back to the original stepping thread. */ | |
1812 | int hit_singlestep_breakpoint; | |
1813 | }; | |
1814 | ||
1815 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1816 | |
1817 | static void | |
4d9d9d04 PA |
1818 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1819 | { | |
1820 | memset (ecs, 0, sizeof (*ecs)); | |
1821 | ecs->event_thread = tp; | |
1822 | ecs->ptid = tp->ptid; | |
1823 | } | |
1824 | ||
1825 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1826 | static void prepare_to_wait (struct execution_control_state *ecs); | |
c4464ade | 1827 | static bool keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1828 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1829 | |
1830 | /* Are there any pending step-over requests? If so, run all we can | |
1831 | now and return true. Otherwise, return false. */ | |
1832 | ||
c4464ade | 1833 | static bool |
c2829269 PA |
1834 | start_step_over (void) |
1835 | { | |
3ec3145c SM |
1836 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
1837 | ||
187b041e | 1838 | thread_info *next; |
c2829269 | 1839 | |
372316f1 PA |
1840 | /* Don't start a new step-over if we already have an in-line |
1841 | step-over operation ongoing. */ | |
1842 | if (step_over_info_valid_p ()) | |
c4464ade | 1843 | return false; |
372316f1 | 1844 | |
187b041e SM |
1845 | /* Steal the global thread step over chain. As we try to initiate displaced |
1846 | steps, threads will be enqueued in the global chain if no buffers are | |
1847 | available. If we iterated on the global chain directly, we might iterate | |
1848 | indefinitely. */ | |
1849 | thread_info *threads_to_step = global_thread_step_over_chain_head; | |
1850 | global_thread_step_over_chain_head = NULL; | |
1851 | ||
1852 | infrun_debug_printf ("stealing global queue of threads to step, length = %d", | |
1853 | thread_step_over_chain_length (threads_to_step)); | |
1854 | ||
1855 | bool started = false; | |
1856 | ||
1857 | /* On scope exit (whatever the reason, return or exception), if there are | |
1858 | threads left in the THREADS_TO_STEP chain, put back these threads in the | |
1859 | global list. */ | |
1860 | SCOPE_EXIT | |
1861 | { | |
1862 | if (threads_to_step == nullptr) | |
1863 | infrun_debug_printf ("step-over queue now empty"); | |
1864 | else | |
1865 | { | |
1866 | infrun_debug_printf ("putting back %d threads to step in global queue", | |
1867 | thread_step_over_chain_length (threads_to_step)); | |
1868 | ||
1869 | global_thread_step_over_chain_enqueue_chain (threads_to_step); | |
1870 | } | |
1871 | }; | |
1872 | ||
1873 | for (thread_info *tp = threads_to_step; tp != NULL; tp = next) | |
237fc4c9 | 1874 | { |
4d9d9d04 PA |
1875 | struct execution_control_state ecss; |
1876 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1877 | step_over_what step_what; |
372316f1 | 1878 | int must_be_in_line; |
c2829269 | 1879 | |
c65d6b55 PA |
1880 | gdb_assert (!tp->stop_requested); |
1881 | ||
187b041e | 1882 | next = thread_step_over_chain_next (threads_to_step, tp); |
237fc4c9 | 1883 | |
187b041e SM |
1884 | if (tp->inf->displaced_step_state.unavailable) |
1885 | { | |
1886 | /* The arch told us to not even try preparing another displaced step | |
1887 | for this inferior. Just leave the thread in THREADS_TO_STEP, it | |
1888 | will get moved to the global chain on scope exit. */ | |
1889 | continue; | |
1890 | } | |
1891 | ||
1892 | /* Remove thread from the THREADS_TO_STEP chain. If anything goes wrong | |
1893 | while we try to prepare the displaced step, we don't add it back to | |
1894 | the global step over chain. This is to avoid a thread staying in the | |
1895 | step over chain indefinitely if something goes wrong when resuming it | |
1896 | If the error is intermittent and it still needs a step over, it will | |
1897 | get enqueued again when we try to resume it normally. */ | |
1898 | thread_step_over_chain_remove (&threads_to_step, tp); | |
c2829269 | 1899 | |
372316f1 PA |
1900 | step_what = thread_still_needs_step_over (tp); |
1901 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1902 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1903 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1904 | |
1905 | /* We currently stop all threads of all processes to step-over | |
1906 | in-line. If we need to start a new in-line step-over, let | |
1907 | any pending displaced steps finish first. */ | |
187b041e SM |
1908 | if (must_be_in_line && displaced_step_in_progress_any_thread ()) |
1909 | { | |
1910 | global_thread_step_over_chain_enqueue (tp); | |
1911 | continue; | |
1912 | } | |
c2829269 | 1913 | |
372316f1 PA |
1914 | if (tp->control.trap_expected |
1915 | || tp->resumed | |
1916 | || tp->executing) | |
ad53cd71 | 1917 | { |
4d9d9d04 PA |
1918 | internal_error (__FILE__, __LINE__, |
1919 | "[%s] has inconsistent state: " | |
372316f1 | 1920 | "trap_expected=%d, resumed=%d, executing=%d\n", |
a068643d | 1921 | target_pid_to_str (tp->ptid).c_str (), |
4d9d9d04 | 1922 | tp->control.trap_expected, |
372316f1 | 1923 | tp->resumed, |
4d9d9d04 | 1924 | tp->executing); |
ad53cd71 | 1925 | } |
1c5cfe86 | 1926 | |
1eb8556f SM |
1927 | infrun_debug_printf ("resuming [%s] for step-over", |
1928 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 PA |
1929 | |
1930 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
1931 | is no longer inserted. In all-stop, we want to keep looking | |
1932 | for a thread that needs a step-over instead of resuming TP, | |
1933 | because we wouldn't be able to resume anything else until the | |
1934 | target stops again. In non-stop, the resume always resumes | |
1935 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 1936 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 1937 | continue; |
8550d3b3 | 1938 | |
00431a78 | 1939 | switch_to_thread (tp); |
4d9d9d04 PA |
1940 | reset_ecs (ecs, tp); |
1941 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 1942 | |
4d9d9d04 PA |
1943 | if (!ecs->wait_some_more) |
1944 | error (_("Command aborted.")); | |
1c5cfe86 | 1945 | |
187b041e SM |
1946 | /* If the thread's step over could not be initiated because no buffers |
1947 | were available, it was re-added to the global step over chain. */ | |
1948 | if (tp->resumed) | |
1949 | { | |
1950 | infrun_debug_printf ("[%s] was resumed.", | |
1951 | target_pid_to_str (tp->ptid).c_str ()); | |
1952 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
1953 | } | |
1954 | else | |
1955 | { | |
1956 | infrun_debug_printf ("[%s] was NOT resumed.", | |
1957 | target_pid_to_str (tp->ptid).c_str ()); | |
1958 | gdb_assert (thread_is_in_step_over_chain (tp)); | |
1959 | } | |
372316f1 PA |
1960 | |
1961 | /* If we started a new in-line step-over, we're done. */ | |
1962 | if (step_over_info_valid_p ()) | |
1963 | { | |
1964 | gdb_assert (tp->control.trap_expected); | |
187b041e SM |
1965 | started = true; |
1966 | break; | |
372316f1 PA |
1967 | } |
1968 | ||
fbea99ea | 1969 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
1970 | { |
1971 | /* On all-stop, shouldn't have resumed unless we needed a | |
1972 | step over. */ | |
1973 | gdb_assert (tp->control.trap_expected | |
1974 | || tp->step_after_step_resume_breakpoint); | |
1975 | ||
1976 | /* With remote targets (at least), in all-stop, we can't | |
1977 | issue any further remote commands until the program stops | |
1978 | again. */ | |
187b041e SM |
1979 | started = true; |
1980 | break; | |
1c5cfe86 | 1981 | } |
c2829269 | 1982 | |
4d9d9d04 PA |
1983 | /* Either the thread no longer needed a step-over, or a new |
1984 | displaced stepping sequence started. Even in the latter | |
1985 | case, continue looking. Maybe we can also start another | |
1986 | displaced step on a thread of other process. */ | |
237fc4c9 | 1987 | } |
4d9d9d04 | 1988 | |
187b041e | 1989 | return started; |
237fc4c9 PA |
1990 | } |
1991 | ||
5231c1fd PA |
1992 | /* Update global variables holding ptids to hold NEW_PTID if they were |
1993 | holding OLD_PTID. */ | |
1994 | static void | |
b161a60d SM |
1995 | infrun_thread_ptid_changed (process_stratum_target *target, |
1996 | ptid_t old_ptid, ptid_t new_ptid) | |
5231c1fd | 1997 | { |
b161a60d SM |
1998 | if (inferior_ptid == old_ptid |
1999 | && current_inferior ()->process_target () == target) | |
5231c1fd | 2000 | inferior_ptid = new_ptid; |
5231c1fd PA |
2001 | } |
2002 | ||
237fc4c9 | 2003 | \f |
c906108c | 2004 | |
53904c9e AC |
2005 | static const char schedlock_off[] = "off"; |
2006 | static const char schedlock_on[] = "on"; | |
2007 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2008 | static const char schedlock_replay[] = "replay"; |
40478521 | 2009 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2010 | schedlock_off, |
2011 | schedlock_on, | |
2012 | schedlock_step, | |
f2665db5 | 2013 | schedlock_replay, |
ef346e04 AC |
2014 | NULL |
2015 | }; | |
f2665db5 | 2016 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2017 | static void |
2018 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2019 | struct cmd_list_element *c, const char *value) | |
2020 | { | |
3e43a32a MS |
2021 | fprintf_filtered (file, |
2022 | _("Mode for locking scheduler " | |
2023 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2024 | value); |
2025 | } | |
c906108c SS |
2026 | |
2027 | static void | |
eb4c3f4a | 2028 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2029 | { |
8a3ecb79 | 2030 | if (!target_can_lock_scheduler ()) |
eefe576e AC |
2031 | { |
2032 | scheduler_mode = schedlock_off; | |
2033 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2034 | } | |
c906108c SS |
2035 | } |
2036 | ||
d4db2f36 PA |
2037 | /* True if execution commands resume all threads of all processes by |
2038 | default; otherwise, resume only threads of the current inferior | |
2039 | process. */ | |
491144b5 | 2040 | bool sched_multi = false; |
d4db2f36 | 2041 | |
2facfe5c | 2042 | /* Try to setup for software single stepping over the specified location. |
c4464ade | 2043 | Return true if target_resume() should use hardware single step. |
2facfe5c DD |
2044 | |
2045 | GDBARCH the current gdbarch. | |
2046 | PC the location to step over. */ | |
2047 | ||
c4464ade | 2048 | static bool |
2facfe5c DD |
2049 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) |
2050 | { | |
c4464ade | 2051 | bool hw_step = true; |
2facfe5c | 2052 | |
f02253f1 | 2053 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2054 | && gdbarch_software_single_step_p (gdbarch)) |
2055 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2056 | ||
2facfe5c DD |
2057 | return hw_step; |
2058 | } | |
c906108c | 2059 | |
f3263aa4 PA |
2060 | /* See infrun.h. */ |
2061 | ||
09cee04b PA |
2062 | ptid_t |
2063 | user_visible_resume_ptid (int step) | |
2064 | { | |
f3263aa4 | 2065 | ptid_t resume_ptid; |
09cee04b | 2066 | |
09cee04b PA |
2067 | if (non_stop) |
2068 | { | |
2069 | /* With non-stop mode on, threads are always handled | |
2070 | individually. */ | |
2071 | resume_ptid = inferior_ptid; | |
2072 | } | |
2073 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2074 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2075 | { |
f3263aa4 PA |
2076 | /* User-settable 'scheduler' mode requires solo thread |
2077 | resume. */ | |
09cee04b PA |
2078 | resume_ptid = inferior_ptid; |
2079 | } | |
f2665db5 MM |
2080 | else if ((scheduler_mode == schedlock_replay) |
2081 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2082 | { | |
2083 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2084 | mode. */ | |
2085 | resume_ptid = inferior_ptid; | |
2086 | } | |
f3263aa4 PA |
2087 | else if (!sched_multi && target_supports_multi_process ()) |
2088 | { | |
2089 | /* Resume all threads of the current process (and none of other | |
2090 | processes). */ | |
e99b03dc | 2091 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2092 | } |
2093 | else | |
2094 | { | |
2095 | /* Resume all threads of all processes. */ | |
2096 | resume_ptid = RESUME_ALL; | |
2097 | } | |
09cee04b PA |
2098 | |
2099 | return resume_ptid; | |
2100 | } | |
2101 | ||
5b6d1e4f PA |
2102 | /* See infrun.h. */ |
2103 | ||
2104 | process_stratum_target * | |
2105 | user_visible_resume_target (ptid_t resume_ptid) | |
2106 | { | |
2107 | return (resume_ptid == minus_one_ptid && sched_multi | |
2108 | ? NULL | |
2109 | : current_inferior ()->process_target ()); | |
2110 | } | |
2111 | ||
fbea99ea PA |
2112 | /* Return a ptid representing the set of threads that we will resume, |
2113 | in the perspective of the target, assuming run control handling | |
2114 | does not require leaving some threads stopped (e.g., stepping past | |
2115 | breakpoint). USER_STEP indicates whether we're about to start the | |
2116 | target for a stepping command. */ | |
2117 | ||
2118 | static ptid_t | |
2119 | internal_resume_ptid (int user_step) | |
2120 | { | |
2121 | /* In non-stop, we always control threads individually. Note that | |
2122 | the target may always work in non-stop mode even with "set | |
2123 | non-stop off", in which case user_visible_resume_ptid could | |
2124 | return a wildcard ptid. */ | |
2125 | if (target_is_non_stop_p ()) | |
2126 | return inferior_ptid; | |
2127 | else | |
2128 | return user_visible_resume_ptid (user_step); | |
2129 | } | |
2130 | ||
64ce06e4 PA |
2131 | /* Wrapper for target_resume, that handles infrun-specific |
2132 | bookkeeping. */ | |
2133 | ||
2134 | static void | |
c4464ade | 2135 | do_target_resume (ptid_t resume_ptid, bool step, enum gdb_signal sig) |
64ce06e4 PA |
2136 | { |
2137 | struct thread_info *tp = inferior_thread (); | |
2138 | ||
c65d6b55 PA |
2139 | gdb_assert (!tp->stop_requested); |
2140 | ||
64ce06e4 | 2141 | /* Install inferior's terminal modes. */ |
223ffa71 | 2142 | target_terminal::inferior (); |
64ce06e4 PA |
2143 | |
2144 | /* Avoid confusing the next resume, if the next stop/resume | |
2145 | happens to apply to another thread. */ | |
2146 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2147 | ||
8f572e5c PA |
2148 | /* Advise target which signals may be handled silently. |
2149 | ||
2150 | If we have removed breakpoints because we are stepping over one | |
2151 | in-line (in any thread), we need to receive all signals to avoid | |
2152 | accidentally skipping a breakpoint during execution of a signal | |
2153 | handler. | |
2154 | ||
2155 | Likewise if we're displaced stepping, otherwise a trap for a | |
2156 | breakpoint in a signal handler might be confused with the | |
7def77a1 | 2157 | displaced step finishing. We don't make the displaced_step_finish |
8f572e5c PA |
2158 | step distinguish the cases instead, because: |
2159 | ||
2160 | - a backtrace while stopped in the signal handler would show the | |
2161 | scratch pad as frame older than the signal handler, instead of | |
2162 | the real mainline code. | |
2163 | ||
2164 | - when the thread is later resumed, the signal handler would | |
2165 | return to the scratch pad area, which would no longer be | |
2166 | valid. */ | |
2167 | if (step_over_info_valid_p () | |
00431a78 | 2168 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2169 | target_pass_signals ({}); |
64ce06e4 | 2170 | else |
adc6a863 | 2171 | target_pass_signals (signal_pass); |
64ce06e4 PA |
2172 | |
2173 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2174 | |
2175 | target_commit_resume (); | |
5b6d1e4f PA |
2176 | |
2177 | if (target_can_async_p ()) | |
2178 | target_async (1); | |
64ce06e4 PA |
2179 | } |
2180 | ||
d930703d | 2181 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2182 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2183 | call 'resume', which handles exceptions. */ | |
c906108c | 2184 | |
71d378ae PA |
2185 | static void |
2186 | resume_1 (enum gdb_signal sig) | |
c906108c | 2187 | { |
515630c5 | 2188 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2189 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2190 | struct thread_info *tp = inferior_thread (); |
8b86c959 | 2191 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2192 | ptid_t resume_ptid; |
856e7dd6 PA |
2193 | /* This represents the user's step vs continue request. When |
2194 | deciding whether "set scheduler-locking step" applies, it's the | |
2195 | user's intention that counts. */ | |
2196 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2197 | /* This represents what we'll actually request the target to do. |
2198 | This can decay from a step to a continue, if e.g., we need to | |
2199 | implement single-stepping with breakpoints (software | |
2200 | single-step). */ | |
c4464ade | 2201 | bool step; |
c7e8a53c | 2202 | |
c65d6b55 | 2203 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2204 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2205 | ||
372316f1 PA |
2206 | if (tp->suspend.waitstatus_pending_p) |
2207 | { | |
1eb8556f SM |
2208 | infrun_debug_printf |
2209 | ("thread %s has pending wait " | |
2210 | "status %s (currently_stepping=%d).", | |
2211 | target_pid_to_str (tp->ptid).c_str (), | |
2212 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2213 | currently_stepping (tp)); | |
372316f1 | 2214 | |
5b6d1e4f | 2215 | tp->inf->process_target ()->threads_executing = true; |
719546c4 | 2216 | tp->resumed = true; |
372316f1 PA |
2217 | |
2218 | /* FIXME: What should we do if we are supposed to resume this | |
2219 | thread with a signal? Maybe we should maintain a queue of | |
2220 | pending signals to deliver. */ | |
2221 | if (sig != GDB_SIGNAL_0) | |
2222 | { | |
fd7dcb94 | 2223 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d TT |
2224 | gdb_signal_to_name (sig), |
2225 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2226 | } |
2227 | ||
2228 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2229 | |
2230 | if (target_can_async_p ()) | |
9516f85a AB |
2231 | { |
2232 | target_async (1); | |
2233 | /* Tell the event loop we have an event to process. */ | |
2234 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2235 | } | |
372316f1 PA |
2236 | return; |
2237 | } | |
2238 | ||
2239 | tp->stepped_breakpoint = 0; | |
2240 | ||
6b403daa PA |
2241 | /* Depends on stepped_breakpoint. */ |
2242 | step = currently_stepping (tp); | |
2243 | ||
74609e71 YQ |
2244 | if (current_inferior ()->waiting_for_vfork_done) |
2245 | { | |
48f9886d PA |
2246 | /* Don't try to single-step a vfork parent that is waiting for |
2247 | the child to get out of the shared memory region (by exec'ing | |
2248 | or exiting). This is particularly important on software | |
2249 | single-step archs, as the child process would trip on the | |
2250 | software single step breakpoint inserted for the parent | |
2251 | process. Since the parent will not actually execute any | |
2252 | instruction until the child is out of the shared region (such | |
2253 | are vfork's semantics), it is safe to simply continue it. | |
2254 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2255 | the parent, and tell it to `keep_going', which automatically | |
2256 | re-sets it stepping. */ | |
1eb8556f | 2257 | infrun_debug_printf ("resume : clear step"); |
c4464ade | 2258 | step = false; |
74609e71 YQ |
2259 | } |
2260 | ||
7ca9b62a TBA |
2261 | CORE_ADDR pc = regcache_read_pc (regcache); |
2262 | ||
1eb8556f SM |
2263 | infrun_debug_printf ("step=%d, signal=%s, trap_expected=%d, " |
2264 | "current thread [%s] at %s", | |
2265 | step, gdb_signal_to_symbol_string (sig), | |
2266 | tp->control.trap_expected, | |
2267 | target_pid_to_str (inferior_ptid).c_str (), | |
2268 | paddress (gdbarch, pc)); | |
c906108c | 2269 | |
c2c6d25f JM |
2270 | /* Normally, by the time we reach `resume', the breakpoints are either |
2271 | removed or inserted, as appropriate. The exception is if we're sitting | |
2272 | at a permanent breakpoint; we need to step over it, but permanent | |
2273 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2274 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2275 | { |
af48d08f PA |
2276 | if (sig != GDB_SIGNAL_0) |
2277 | { | |
2278 | /* We have a signal to pass to the inferior. The resume | |
2279 | may, or may not take us to the signal handler. If this | |
2280 | is a step, we'll need to stop in the signal handler, if | |
2281 | there's one, (if the target supports stepping into | |
2282 | handlers), or in the next mainline instruction, if | |
2283 | there's no handler. If this is a continue, we need to be | |
2284 | sure to run the handler with all breakpoints inserted. | |
2285 | In all cases, set a breakpoint at the current address | |
2286 | (where the handler returns to), and once that breakpoint | |
2287 | is hit, resume skipping the permanent breakpoint. If | |
2288 | that breakpoint isn't hit, then we've stepped into the | |
2289 | signal handler (or hit some other event). We'll delete | |
2290 | the step-resume breakpoint then. */ | |
2291 | ||
1eb8556f SM |
2292 | infrun_debug_printf ("resume: skipping permanent breakpoint, " |
2293 | "deliver signal first"); | |
af48d08f PA |
2294 | |
2295 | clear_step_over_info (); | |
2296 | tp->control.trap_expected = 0; | |
2297 | ||
2298 | if (tp->control.step_resume_breakpoint == NULL) | |
2299 | { | |
2300 | /* Set a "high-priority" step-resume, as we don't want | |
2301 | user breakpoints at PC to trigger (again) when this | |
2302 | hits. */ | |
2303 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2304 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2305 | ||
2306 | tp->step_after_step_resume_breakpoint = step; | |
2307 | } | |
2308 | ||
2309 | insert_breakpoints (); | |
2310 | } | |
2311 | else | |
2312 | { | |
2313 | /* There's no signal to pass, we can go ahead and skip the | |
2314 | permanent breakpoint manually. */ | |
1eb8556f | 2315 | infrun_debug_printf ("skipping permanent breakpoint"); |
af48d08f PA |
2316 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); |
2317 | /* Update pc to reflect the new address from which we will | |
2318 | execute instructions. */ | |
2319 | pc = regcache_read_pc (regcache); | |
2320 | ||
2321 | if (step) | |
2322 | { | |
2323 | /* We've already advanced the PC, so the stepping part | |
2324 | is done. Now we need to arrange for a trap to be | |
2325 | reported to handle_inferior_event. Set a breakpoint | |
2326 | at the current PC, and run to it. Don't update | |
2327 | prev_pc, because if we end in | |
44a1ee51 PA |
2328 | switch_back_to_stepped_thread, we want the "expected |
2329 | thread advanced also" branch to be taken. IOW, we | |
2330 | don't want this thread to step further from PC | |
af48d08f | 2331 | (overstep). */ |
1ac806b8 | 2332 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2333 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2334 | insert_breakpoints (); | |
2335 | ||
fbea99ea | 2336 | resume_ptid = internal_resume_ptid (user_step); |
c4464ade | 2337 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
719546c4 | 2338 | tp->resumed = true; |
af48d08f PA |
2339 | return; |
2340 | } | |
2341 | } | |
6d350bb5 | 2342 | } |
c2c6d25f | 2343 | |
c1e36e3e PA |
2344 | /* If we have a breakpoint to step over, make sure to do a single |
2345 | step only. Same if we have software watchpoints. */ | |
2346 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2347 | tp->control.may_range_step = 0; | |
2348 | ||
7da6a5b9 LM |
2349 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2350 | copy of the instruction at a different address. | |
237fc4c9 PA |
2351 | |
2352 | We can't use displaced stepping when we have a signal to deliver; | |
2353 | the comments for displaced_step_prepare explain why. The | |
2354 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2355 | signals' explain what we do instead. |
2356 | ||
2357 | We can't use displaced stepping when we are waiting for vfork_done | |
2358 | event, displaced stepping breaks the vfork child similarly as single | |
2359 | step software breakpoint. */ | |
3fc8eb30 PA |
2360 | if (tp->control.trap_expected |
2361 | && use_displaced_stepping (tp) | |
cb71640d | 2362 | && !step_over_info_valid_p () |
a493e3e2 | 2363 | && sig == GDB_SIGNAL_0 |
74609e71 | 2364 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2365 | { |
bab37966 SM |
2366 | displaced_step_prepare_status prepare_status |
2367 | = displaced_step_prepare (tp); | |
fc1cf338 | 2368 | |
bab37966 | 2369 | if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
d56b7306 | 2370 | { |
1eb8556f | 2371 | infrun_debug_printf ("Got placed in step-over queue"); |
4d9d9d04 PA |
2372 | |
2373 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2374 | return; |
2375 | } | |
bab37966 | 2376 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_CANT) |
3fc8eb30 PA |
2377 | { |
2378 | /* Fallback to stepping over the breakpoint in-line. */ | |
2379 | ||
2380 | if (target_is_non_stop_p ()) | |
2381 | stop_all_threads (); | |
2382 | ||
a01bda52 | 2383 | set_step_over_info (regcache->aspace (), |
21edc42f | 2384 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2385 | |
2386 | step = maybe_software_singlestep (gdbarch, pc); | |
2387 | ||
2388 | insert_breakpoints (); | |
2389 | } | |
bab37966 | 2390 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_OK) |
3fc8eb30 | 2391 | { |
3fc8eb30 PA |
2392 | /* Update pc to reflect the new address from which we will |
2393 | execute instructions due to displaced stepping. */ | |
00431a78 | 2394 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2395 | |
40a53766 | 2396 | step = gdbarch_displaced_step_hw_singlestep (gdbarch); |
3fc8eb30 | 2397 | } |
bab37966 SM |
2398 | else |
2399 | gdb_assert_not_reached (_("Invalid displaced_step_prepare_status " | |
2400 | "value.")); | |
237fc4c9 PA |
2401 | } |
2402 | ||
2facfe5c | 2403 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2404 | else if (step) |
2facfe5c | 2405 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2406 | |
30852783 UW |
2407 | /* Currently, our software single-step implementation leads to different |
2408 | results than hardware single-stepping in one situation: when stepping | |
2409 | into delivering a signal which has an associated signal handler, | |
2410 | hardware single-step will stop at the first instruction of the handler, | |
2411 | while software single-step will simply skip execution of the handler. | |
2412 | ||
2413 | For now, this difference in behavior is accepted since there is no | |
2414 | easy way to actually implement single-stepping into a signal handler | |
2415 | without kernel support. | |
2416 | ||
2417 | However, there is one scenario where this difference leads to follow-on | |
2418 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2419 | and then single-stepping. In this case, the software single-step | |
2420 | behavior means that even if there is a *breakpoint* in the signal | |
2421 | handler, GDB still would not stop. | |
2422 | ||
2423 | Fortunately, we can at least fix this particular issue. We detect | |
2424 | here the case where we are about to deliver a signal while software | |
2425 | single-stepping with breakpoints removed. In this situation, we | |
2426 | revert the decisions to remove all breakpoints and insert single- | |
2427 | step breakpoints, and instead we install a step-resume breakpoint | |
2428 | at the current address, deliver the signal without stepping, and | |
2429 | once we arrive back at the step-resume breakpoint, actually step | |
2430 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2431 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2432 | && sig != GDB_SIGNAL_0 |
2433 | && step_over_info_valid_p ()) | |
30852783 UW |
2434 | { |
2435 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2436 | immediately after a handler returns, might already have |
30852783 UW |
2437 | a step-resume breakpoint set on the earlier handler. We cannot |
2438 | set another step-resume breakpoint; just continue on until the | |
2439 | original breakpoint is hit. */ | |
2440 | if (tp->control.step_resume_breakpoint == NULL) | |
2441 | { | |
2c03e5be | 2442 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2443 | tp->step_after_step_resume_breakpoint = 1; |
2444 | } | |
2445 | ||
34b7e8a6 | 2446 | delete_single_step_breakpoints (tp); |
30852783 | 2447 | |
31e77af2 | 2448 | clear_step_over_info (); |
30852783 | 2449 | tp->control.trap_expected = 0; |
31e77af2 PA |
2450 | |
2451 | insert_breakpoints (); | |
30852783 UW |
2452 | } |
2453 | ||
b0f16a3e SM |
2454 | /* If STEP is set, it's a request to use hardware stepping |
2455 | facilities. But in that case, we should never | |
2456 | use singlestep breakpoint. */ | |
34b7e8a6 | 2457 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2458 | |
fbea99ea | 2459 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2460 | if (tp->control.trap_expected) |
b0f16a3e SM |
2461 | { |
2462 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2463 | hit, either by single-stepping the thread with the breakpoint |
2464 | removed, or by displaced stepping, with the breakpoint inserted. | |
2465 | In the former case, we need to single-step only this thread, | |
2466 | and keep others stopped, as they can miss this breakpoint if | |
2467 | allowed to run. That's not really a problem for displaced | |
2468 | stepping, but, we still keep other threads stopped, in case | |
2469 | another thread is also stopped for a breakpoint waiting for | |
2470 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2471 | resume_ptid = inferior_ptid; |
2472 | } | |
fbea99ea PA |
2473 | else |
2474 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2475 | |
7f5ef605 PA |
2476 | if (execution_direction != EXEC_REVERSE |
2477 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2478 | { |
372316f1 PA |
2479 | /* There are two cases where we currently need to step a |
2480 | breakpoint instruction when we have a signal to deliver: | |
2481 | ||
2482 | - See handle_signal_stop where we handle random signals that | |
2483 | could take out us out of the stepping range. Normally, in | |
2484 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2485 | signal handler with a breakpoint at PC, but there are cases |
2486 | where we should _always_ single-step, even if we have a | |
2487 | step-resume breakpoint, like when a software watchpoint is | |
2488 | set. Assuming single-stepping and delivering a signal at the | |
2489 | same time would takes us to the signal handler, then we could | |
2490 | have removed the breakpoint at PC to step over it. However, | |
2491 | some hardware step targets (like e.g., Mac OS) can't step | |
2492 | into signal handlers, and for those, we need to leave the | |
2493 | breakpoint at PC inserted, as otherwise if the handler | |
2494 | recurses and executes PC again, it'll miss the breakpoint. | |
2495 | So we leave the breakpoint inserted anyway, but we need to | |
2496 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2497 | that adjust_pc_after_break doesn't end up confused. |
2498 | ||
dda83cd7 | 2499 | - In non-stop if we insert a breakpoint (e.g., a step-resume) |
372316f1 PA |
2500 | in one thread after another thread that was stepping had been |
2501 | momentarily paused for a step-over. When we re-resume the | |
2502 | stepping thread, it may be resumed from that address with a | |
2503 | breakpoint that hasn't trapped yet. Seen with | |
2504 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2505 | do displaced stepping. */ | |
2506 | ||
1eb8556f SM |
2507 | infrun_debug_printf ("resume: [%s] stepped breakpoint", |
2508 | target_pid_to_str (tp->ptid).c_str ()); | |
7f5ef605 PA |
2509 | |
2510 | tp->stepped_breakpoint = 1; | |
2511 | ||
b0f16a3e SM |
2512 | /* Most targets can step a breakpoint instruction, thus |
2513 | executing it normally. But if this one cannot, just | |
2514 | continue and we will hit it anyway. */ | |
7f5ef605 | 2515 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4464ade | 2516 | step = false; |
b0f16a3e | 2517 | } |
ef5cf84e | 2518 | |
b0f16a3e | 2519 | if (debug_displaced |
cb71640d | 2520 | && tp->control.trap_expected |
3fc8eb30 | 2521 | && use_displaced_stepping (tp) |
cb71640d | 2522 | && !step_over_info_valid_p ()) |
b0f16a3e | 2523 | { |
00431a78 | 2524 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2525 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2526 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2527 | gdb_byte buf[4]; | |
2528 | ||
b0f16a3e | 2529 | read_memory (actual_pc, buf, sizeof (buf)); |
136821d9 SM |
2530 | displaced_debug_printf ("run %s: %s", |
2531 | paddress (resume_gdbarch, actual_pc), | |
2532 | displaced_step_dump_bytes | |
2533 | (buf, sizeof (buf)).c_str ()); | |
b0f16a3e | 2534 | } |
237fc4c9 | 2535 | |
b0f16a3e SM |
2536 | if (tp->control.may_range_step) |
2537 | { | |
2538 | /* If we're resuming a thread with the PC out of the step | |
2539 | range, then we're doing some nested/finer run control | |
2540 | operation, like stepping the thread out of the dynamic | |
2541 | linker or the displaced stepping scratch pad. We | |
2542 | shouldn't have allowed a range step then. */ | |
2543 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2544 | } | |
c1e36e3e | 2545 | |
64ce06e4 | 2546 | do_target_resume (resume_ptid, step, sig); |
719546c4 | 2547 | tp->resumed = true; |
c906108c | 2548 | } |
71d378ae PA |
2549 | |
2550 | /* Resume the inferior. SIG is the signal to give the inferior | |
2551 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2552 | rolls back state on error. */ | |
2553 | ||
aff4e175 | 2554 | static void |
71d378ae PA |
2555 | resume (gdb_signal sig) |
2556 | { | |
a70b8144 | 2557 | try |
71d378ae PA |
2558 | { |
2559 | resume_1 (sig); | |
2560 | } | |
230d2906 | 2561 | catch (const gdb_exception &ex) |
71d378ae PA |
2562 | { |
2563 | /* If resuming is being aborted for any reason, delete any | |
2564 | single-step breakpoint resume_1 may have created, to avoid | |
2565 | confusing the following resumption, and to avoid leaving | |
2566 | single-step breakpoints perturbing other threads, in case | |
2567 | we're running in non-stop mode. */ | |
2568 | if (inferior_ptid != null_ptid) | |
2569 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2570 | throw; |
71d378ae | 2571 | } |
71d378ae PA |
2572 | } |
2573 | ||
c906108c | 2574 | \f |
237fc4c9 | 2575 | /* Proceeding. */ |
c906108c | 2576 | |
4c2f2a79 PA |
2577 | /* See infrun.h. */ |
2578 | ||
2579 | /* Counter that tracks number of user visible stops. This can be used | |
2580 | to tell whether a command has proceeded the inferior past the | |
2581 | current location. This allows e.g., inferior function calls in | |
2582 | breakpoint commands to not interrupt the command list. When the | |
2583 | call finishes successfully, the inferior is standing at the same | |
2584 | breakpoint as if nothing happened (and so we don't call | |
2585 | normal_stop). */ | |
2586 | static ULONGEST current_stop_id; | |
2587 | ||
2588 | /* See infrun.h. */ | |
2589 | ||
2590 | ULONGEST | |
2591 | get_stop_id (void) | |
2592 | { | |
2593 | return current_stop_id; | |
2594 | } | |
2595 | ||
2596 | /* Called when we report a user visible stop. */ | |
2597 | ||
2598 | static void | |
2599 | new_stop_id (void) | |
2600 | { | |
2601 | current_stop_id++; | |
2602 | } | |
2603 | ||
c906108c SS |
2604 | /* Clear out all variables saying what to do when inferior is continued. |
2605 | First do this, then set the ones you want, then call `proceed'. */ | |
2606 | ||
a7212384 UW |
2607 | static void |
2608 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2609 | { |
1eb8556f | 2610 | infrun_debug_printf ("%s", target_pid_to_str (tp->ptid).c_str ()); |
d6b48e9c | 2611 | |
372316f1 PA |
2612 | /* If we're starting a new sequence, then the previous finished |
2613 | single-step is no longer relevant. */ | |
2614 | if (tp->suspend.waitstatus_pending_p) | |
2615 | { | |
2616 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2617 | { | |
1eb8556f SM |
2618 | infrun_debug_printf ("pending event of %s was a finished step. " |
2619 | "Discarding.", | |
2620 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2621 | |
2622 | tp->suspend.waitstatus_pending_p = 0; | |
2623 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2624 | } | |
1eb8556f | 2625 | else |
372316f1 | 2626 | { |
1eb8556f SM |
2627 | infrun_debug_printf |
2628 | ("thread %s has pending wait status %s (currently_stepping=%d).", | |
2629 | target_pid_to_str (tp->ptid).c_str (), | |
2630 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2631 | currently_stepping (tp)); | |
372316f1 PA |
2632 | } |
2633 | } | |
2634 | ||
70509625 PA |
2635 | /* If this signal should not be seen by program, give it zero. |
2636 | Used for debugging signals. */ | |
2637 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2638 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2639 | ||
46e3ed7f | 2640 | delete tp->thread_fsm; |
243a9253 PA |
2641 | tp->thread_fsm = NULL; |
2642 | ||
16c381f0 JK |
2643 | tp->control.trap_expected = 0; |
2644 | tp->control.step_range_start = 0; | |
2645 | tp->control.step_range_end = 0; | |
c1e36e3e | 2646 | tp->control.may_range_step = 0; |
16c381f0 JK |
2647 | tp->control.step_frame_id = null_frame_id; |
2648 | tp->control.step_stack_frame_id = null_frame_id; | |
2649 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2650 | tp->control.step_start_function = NULL; |
a7212384 | 2651 | tp->stop_requested = 0; |
4e1c45ea | 2652 | |
16c381f0 | 2653 | tp->control.stop_step = 0; |
32400beb | 2654 | |
16c381f0 | 2655 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2656 | |
856e7dd6 | 2657 | tp->control.stepping_command = 0; |
17b2616c | 2658 | |
a7212384 | 2659 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2660 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2661 | } |
32400beb | 2662 | |
a7212384 | 2663 | void |
70509625 | 2664 | clear_proceed_status (int step) |
a7212384 | 2665 | { |
f2665db5 MM |
2666 | /* With scheduler-locking replay, stop replaying other threads if we're |
2667 | not replaying the user-visible resume ptid. | |
2668 | ||
2669 | This is a convenience feature to not require the user to explicitly | |
2670 | stop replaying the other threads. We're assuming that the user's | |
2671 | intent is to resume tracing the recorded process. */ | |
2672 | if (!non_stop && scheduler_mode == schedlock_replay | |
2673 | && target_record_is_replaying (minus_one_ptid) | |
2674 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2675 | execution_direction)) | |
2676 | target_record_stop_replaying (); | |
2677 | ||
08036331 | 2678 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2679 | { |
08036331 | 2680 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2681 | process_stratum_target *resume_target |
2682 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2683 | |
2684 | /* In all-stop mode, delete the per-thread status of all threads | |
2685 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2686 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2687 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2688 | } |
2689 | ||
d7e15655 | 2690 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2691 | { |
2692 | struct inferior *inferior; | |
2693 | ||
2694 | if (non_stop) | |
2695 | { | |
6c95b8df PA |
2696 | /* If in non-stop mode, only delete the per-thread status of |
2697 | the current thread. */ | |
a7212384 UW |
2698 | clear_proceed_status_thread (inferior_thread ()); |
2699 | } | |
6c95b8df | 2700 | |
d6b48e9c | 2701 | inferior = current_inferior (); |
16c381f0 | 2702 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2703 | } |
2704 | ||
76727919 | 2705 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2706 | } |
2707 | ||
99619bea PA |
2708 | /* Returns true if TP is still stopped at a breakpoint that needs |
2709 | stepping-over in order to make progress. If the breakpoint is gone | |
2710 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b | 2711 | |
c4464ade | 2712 | static bool |
6c4cfb24 | 2713 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2714 | { |
2715 | if (tp->stepping_over_breakpoint) | |
2716 | { | |
00431a78 | 2717 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2718 | |
a01bda52 | 2719 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2720 | regcache_read_pc (regcache)) |
2721 | == ordinary_breakpoint_here) | |
c4464ade | 2722 | return true; |
99619bea PA |
2723 | |
2724 | tp->stepping_over_breakpoint = 0; | |
2725 | } | |
2726 | ||
c4464ade | 2727 | return false; |
99619bea PA |
2728 | } |
2729 | ||
6c4cfb24 PA |
2730 | /* Check whether thread TP still needs to start a step-over in order |
2731 | to make progress when resumed. Returns an bitwise or of enum | |
2732 | step_over_what bits, indicating what needs to be stepped over. */ | |
2733 | ||
8d297bbf | 2734 | static step_over_what |
6c4cfb24 PA |
2735 | thread_still_needs_step_over (struct thread_info *tp) |
2736 | { | |
8d297bbf | 2737 | step_over_what what = 0; |
6c4cfb24 PA |
2738 | |
2739 | if (thread_still_needs_step_over_bp (tp)) | |
2740 | what |= STEP_OVER_BREAKPOINT; | |
2741 | ||
2742 | if (tp->stepping_over_watchpoint | |
9aed480c | 2743 | && !target_have_steppable_watchpoint ()) |
6c4cfb24 PA |
2744 | what |= STEP_OVER_WATCHPOINT; |
2745 | ||
2746 | return what; | |
2747 | } | |
2748 | ||
483805cf PA |
2749 | /* Returns true if scheduler locking applies. STEP indicates whether |
2750 | we're about to do a step/next-like command to a thread. */ | |
2751 | ||
c4464ade | 2752 | static bool |
856e7dd6 | 2753 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2754 | { |
2755 | return (scheduler_mode == schedlock_on | |
2756 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2757 | && tp->control.stepping_command) |
2758 | || (scheduler_mode == schedlock_replay | |
2759 | && target_record_will_replay (minus_one_ptid, | |
2760 | execution_direction))); | |
483805cf PA |
2761 | } |
2762 | ||
5b6d1e4f PA |
2763 | /* Calls target_commit_resume on all targets. */ |
2764 | ||
2765 | static void | |
2766 | commit_resume_all_targets () | |
2767 | { | |
2768 | scoped_restore_current_thread restore_thread; | |
2769 | ||
2770 | /* Map between process_target and a representative inferior. This | |
2771 | is to avoid committing a resume in the same target more than | |
2772 | once. Resumptions must be idempotent, so this is an | |
2773 | optimization. */ | |
2774 | std::unordered_map<process_stratum_target *, inferior *> conn_inf; | |
2775 | ||
2776 | for (inferior *inf : all_non_exited_inferiors ()) | |
2777 | if (inf->has_execution ()) | |
2778 | conn_inf[inf->process_target ()] = inf; | |
2779 | ||
2780 | for (const auto &ci : conn_inf) | |
2781 | { | |
2782 | inferior *inf = ci.second; | |
2783 | switch_to_inferior_no_thread (inf); | |
2784 | target_commit_resume (); | |
2785 | } | |
2786 | } | |
2787 | ||
2f4fcf00 PA |
2788 | /* Check that all the targets we're about to resume are in non-stop |
2789 | mode. Ideally, we'd only care whether all targets support | |
2790 | target-async, but we're not there yet. E.g., stop_all_threads | |
2791 | doesn't know how to handle all-stop targets. Also, the remote | |
2792 | protocol in all-stop mode is synchronous, irrespective of | |
2793 | target-async, which means that things like a breakpoint re-set | |
2794 | triggered by one target would try to read memory from all targets | |
2795 | and fail. */ | |
2796 | ||
2797 | static void | |
2798 | check_multi_target_resumption (process_stratum_target *resume_target) | |
2799 | { | |
2800 | if (!non_stop && resume_target == nullptr) | |
2801 | { | |
2802 | scoped_restore_current_thread restore_thread; | |
2803 | ||
2804 | /* This is used to track whether we're resuming more than one | |
2805 | target. */ | |
2806 | process_stratum_target *first_connection = nullptr; | |
2807 | ||
2808 | /* The first inferior we see with a target that does not work in | |
2809 | always-non-stop mode. */ | |
2810 | inferior *first_not_non_stop = nullptr; | |
2811 | ||
2812 | for (inferior *inf : all_non_exited_inferiors (resume_target)) | |
2813 | { | |
2814 | switch_to_inferior_no_thread (inf); | |
2815 | ||
55f6301a | 2816 | if (!target_has_execution ()) |
2f4fcf00 PA |
2817 | continue; |
2818 | ||
2819 | process_stratum_target *proc_target | |
2820 | = current_inferior ()->process_target(); | |
2821 | ||
2822 | if (!target_is_non_stop_p ()) | |
2823 | first_not_non_stop = inf; | |
2824 | ||
2825 | if (first_connection == nullptr) | |
2826 | first_connection = proc_target; | |
2827 | else if (first_connection != proc_target | |
2828 | && first_not_non_stop != nullptr) | |
2829 | { | |
2830 | switch_to_inferior_no_thread (first_not_non_stop); | |
2831 | ||
2832 | proc_target = current_inferior ()->process_target(); | |
2833 | ||
2834 | error (_("Connection %d (%s) does not support " | |
2835 | "multi-target resumption."), | |
2836 | proc_target->connection_number, | |
2837 | make_target_connection_string (proc_target).c_str ()); | |
2838 | } | |
2839 | } | |
2840 | } | |
2841 | } | |
2842 | ||
c906108c SS |
2843 | /* Basic routine for continuing the program in various fashions. |
2844 | ||
2845 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
2846 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
2847 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
2848 | |
2849 | You should call clear_proceed_status before calling proceed. */ | |
2850 | ||
2851 | void | |
64ce06e4 | 2852 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2853 | { |
3ec3145c SM |
2854 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
2855 | ||
e58b0e63 PA |
2856 | struct regcache *regcache; |
2857 | struct gdbarch *gdbarch; | |
e58b0e63 | 2858 | CORE_ADDR pc; |
4d9d9d04 PA |
2859 | struct execution_control_state ecss; |
2860 | struct execution_control_state *ecs = &ecss; | |
c4464ade | 2861 | bool started; |
c906108c | 2862 | |
e58b0e63 PA |
2863 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2864 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2865 | resuming the current thread. */ | |
2866 | if (!follow_fork ()) | |
2867 | { | |
2868 | /* The target for some reason decided not to resume. */ | |
2869 | normal_stop (); | |
f148b27e | 2870 | if (target_can_async_p ()) |
b1a35af2 | 2871 | inferior_event_handler (INF_EXEC_COMPLETE); |
e58b0e63 PA |
2872 | return; |
2873 | } | |
2874 | ||
842951eb PA |
2875 | /* We'll update this if & when we switch to a new thread. */ |
2876 | previous_inferior_ptid = inferior_ptid; | |
2877 | ||
e58b0e63 | 2878 | regcache = get_current_regcache (); |
ac7936df | 2879 | gdbarch = regcache->arch (); |
8b86c959 YQ |
2880 | const address_space *aspace = regcache->aspace (); |
2881 | ||
fc75c28b TBA |
2882 | pc = regcache_read_pc_protected (regcache); |
2883 | ||
08036331 | 2884 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 2885 | |
99619bea | 2886 | /* Fill in with reasonable starting values. */ |
08036331 | 2887 | init_thread_stepping_state (cur_thr); |
99619bea | 2888 | |
08036331 | 2889 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 2890 | |
5b6d1e4f PA |
2891 | ptid_t resume_ptid |
2892 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
2893 | process_stratum_target *resume_target | |
2894 | = user_visible_resume_target (resume_ptid); | |
2895 | ||
2f4fcf00 PA |
2896 | check_multi_target_resumption (resume_target); |
2897 | ||
2acceee2 | 2898 | if (addr == (CORE_ADDR) -1) |
c906108c | 2899 | { |
08036331 | 2900 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 2901 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 2902 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2903 | /* There is a breakpoint at the address we will resume at, |
2904 | step one instruction before inserting breakpoints so that | |
2905 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2906 | breakpoint). |
2907 | ||
2908 | Note, we don't do this in reverse, because we won't | |
2909 | actually be executing the breakpoint insn anyway. | |
2910 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 2911 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
2912 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2913 | && gdbarch_single_step_through_delay (gdbarch, | |
2914 | get_current_frame ())) | |
3352ef37 AC |
2915 | /* We stepped onto an instruction that needs to be stepped |
2916 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 2917 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
2918 | } |
2919 | else | |
2920 | { | |
515630c5 | 2921 | regcache_write_pc (regcache, addr); |
c906108c SS |
2922 | } |
2923 | ||
70509625 | 2924 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 2925 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 2926 | |
4d9d9d04 PA |
2927 | /* If an exception is thrown from this point on, make sure to |
2928 | propagate GDB's knowledge of the executing state to the | |
2929 | frontend/user running state. */ | |
5b6d1e4f | 2930 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
2931 | |
2932 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
2933 | threads (e.g., we might need to set threads stepping over | |
2934 | breakpoints first), from the user/frontend's point of view, all | |
2935 | threads in RESUME_PTID are now running. Unless we're calling an | |
2936 | inferior function, as in that case we pretend the inferior | |
2937 | doesn't run at all. */ | |
08036331 | 2938 | if (!cur_thr->control.in_infcall) |
719546c4 | 2939 | set_running (resume_target, resume_ptid, true); |
17b2616c | 2940 | |
1eb8556f SM |
2941 | infrun_debug_printf ("addr=%s, signal=%s", paddress (gdbarch, addr), |
2942 | gdb_signal_to_symbol_string (siggnal)); | |
527159b7 | 2943 | |
4d9d9d04 PA |
2944 | annotate_starting (); |
2945 | ||
2946 | /* Make sure that output from GDB appears before output from the | |
2947 | inferior. */ | |
2948 | gdb_flush (gdb_stdout); | |
2949 | ||
d930703d PA |
2950 | /* Since we've marked the inferior running, give it the terminal. A |
2951 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
2952 | still detect attempts to unblock a stuck connection with repeated | |
2953 | Ctrl-C from within target_pass_ctrlc). */ | |
2954 | target_terminal::inferior (); | |
2955 | ||
4d9d9d04 PA |
2956 | /* In a multi-threaded task we may select another thread and |
2957 | then continue or step. | |
2958 | ||
2959 | But if a thread that we're resuming had stopped at a breakpoint, | |
2960 | it will immediately cause another breakpoint stop without any | |
2961 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
2962 | we must step over it first. | |
2963 | ||
2964 | Look for threads other than the current (TP) that reported a | |
2965 | breakpoint hit and haven't been resumed yet since. */ | |
2966 | ||
2967 | /* If scheduler locking applies, we can avoid iterating over all | |
2968 | threads. */ | |
08036331 | 2969 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 2970 | { |
5b6d1e4f PA |
2971 | for (thread_info *tp : all_non_exited_threads (resume_target, |
2972 | resume_ptid)) | |
08036331 | 2973 | { |
f3f8ece4 PA |
2974 | switch_to_thread_no_regs (tp); |
2975 | ||
4d9d9d04 PA |
2976 | /* Ignore the current thread here. It's handled |
2977 | afterwards. */ | |
08036331 | 2978 | if (tp == cur_thr) |
4d9d9d04 | 2979 | continue; |
c906108c | 2980 | |
4d9d9d04 PA |
2981 | if (!thread_still_needs_step_over (tp)) |
2982 | continue; | |
2983 | ||
2984 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 2985 | |
1eb8556f SM |
2986 | infrun_debug_printf ("need to step-over [%s] first", |
2987 | target_pid_to_str (tp->ptid).c_str ()); | |
99619bea | 2988 | |
28d5518b | 2989 | global_thread_step_over_chain_enqueue (tp); |
2adfaa28 | 2990 | } |
f3f8ece4 PA |
2991 | |
2992 | switch_to_thread (cur_thr); | |
30852783 UW |
2993 | } |
2994 | ||
4d9d9d04 PA |
2995 | /* Enqueue the current thread last, so that we move all other |
2996 | threads over their breakpoints first. */ | |
08036331 | 2997 | if (cur_thr->stepping_over_breakpoint) |
28d5518b | 2998 | global_thread_step_over_chain_enqueue (cur_thr); |
30852783 | 2999 | |
4d9d9d04 PA |
3000 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3001 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3002 | advanced. Must do this before resuming any thread, as in | |
3003 | all-stop/remote, once we resume we can't send any other packet | |
3004 | until the target stops again. */ | |
fc75c28b | 3005 | cur_thr->prev_pc = regcache_read_pc_protected (regcache); |
99619bea | 3006 | |
a9bc57b9 TT |
3007 | { |
3008 | scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume (); | |
85ad3aaf | 3009 | |
a9bc57b9 | 3010 | started = start_step_over (); |
c906108c | 3011 | |
a9bc57b9 TT |
3012 | if (step_over_info_valid_p ()) |
3013 | { | |
3014 | /* Either this thread started a new in-line step over, or some | |
3015 | other thread was already doing one. In either case, don't | |
3016 | resume anything else until the step-over is finished. */ | |
3017 | } | |
3018 | else if (started && !target_is_non_stop_p ()) | |
3019 | { | |
3020 | /* A new displaced stepping sequence was started. In all-stop, | |
3021 | we can't talk to the target anymore until it next stops. */ | |
3022 | } | |
3023 | else if (!non_stop && target_is_non_stop_p ()) | |
3024 | { | |
3ec3145c SM |
3025 | INFRUN_SCOPED_DEBUG_START_END |
3026 | ("resuming threads, all-stop-on-top-of-non-stop"); | |
3027 | ||
a9bc57b9 TT |
3028 | /* In all-stop, but the target is always in non-stop mode. |
3029 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3030 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3031 | resume_ptid)) | |
3032 | { | |
3033 | switch_to_thread_no_regs (tp); | |
3034 | ||
f9fac3c8 SM |
3035 | if (!tp->inf->has_execution ()) |
3036 | { | |
1eb8556f SM |
3037 | infrun_debug_printf ("[%s] target has no execution", |
3038 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3039 | continue; |
3040 | } | |
f3f8ece4 | 3041 | |
f9fac3c8 SM |
3042 | if (tp->resumed) |
3043 | { | |
1eb8556f SM |
3044 | infrun_debug_printf ("[%s] resumed", |
3045 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3046 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
3047 | continue; | |
3048 | } | |
fbea99ea | 3049 | |
f9fac3c8 SM |
3050 | if (thread_is_in_step_over_chain (tp)) |
3051 | { | |
1eb8556f SM |
3052 | infrun_debug_printf ("[%s] needs step-over", |
3053 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3054 | continue; |
3055 | } | |
fbea99ea | 3056 | |
1eb8556f | 3057 | infrun_debug_printf ("resuming %s", |
dda83cd7 | 3058 | target_pid_to_str (tp->ptid).c_str ()); |
fbea99ea | 3059 | |
f9fac3c8 SM |
3060 | reset_ecs (ecs, tp); |
3061 | switch_to_thread (tp); | |
3062 | keep_going_pass_signal (ecs); | |
3063 | if (!ecs->wait_some_more) | |
3064 | error (_("Command aborted.")); | |
3065 | } | |
a9bc57b9 | 3066 | } |
08036331 | 3067 | else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3068 | { |
3069 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3070 | reset_ecs (ecs, cur_thr); |
3071 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3072 | keep_going_pass_signal (ecs); |
3073 | if (!ecs->wait_some_more) | |
3074 | error (_("Command aborted.")); | |
3075 | } | |
3076 | } | |
c906108c | 3077 | |
5b6d1e4f | 3078 | commit_resume_all_targets (); |
85ad3aaf | 3079 | |
731f534f | 3080 | finish_state.release (); |
c906108c | 3081 | |
873657b9 PA |
3082 | /* If we've switched threads above, switch back to the previously |
3083 | current thread. We don't want the user to see a different | |
3084 | selected thread. */ | |
3085 | switch_to_thread (cur_thr); | |
3086 | ||
0b333c5e PA |
3087 | /* Tell the event loop to wait for it to stop. If the target |
3088 | supports asynchronous execution, it'll do this from within | |
3089 | target_resume. */ | |
362646f5 | 3090 | if (!target_can_async_p ()) |
0b333c5e | 3091 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3092 | } |
c906108c SS |
3093 | \f |
3094 | ||
3095 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3096 | |
c906108c | 3097 | void |
8621d6a9 | 3098 | start_remote (int from_tty) |
c906108c | 3099 | { |
5b6d1e4f PA |
3100 | inferior *inf = current_inferior (); |
3101 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3102 | |
1777feb0 | 3103 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3104 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3105 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3106 | nothing is returned (instead of just blocking). Because of this, |
3107 | targets expecting an immediate response need to, internally, set | |
3108 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3109 | timeout. */ |
6426a772 JM |
3110 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3111 | differentiate to its caller what the state of the target is after | |
3112 | the initial open has been performed. Here we're assuming that | |
3113 | the target has stopped. It should be possible to eventually have | |
3114 | target_open() return to the caller an indication that the target | |
3115 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3116 | for an async run. */ |
5b6d1e4f | 3117 | wait_for_inferior (inf); |
8621d6a9 DJ |
3118 | |
3119 | /* Now that the inferior has stopped, do any bookkeeping like | |
3120 | loading shared libraries. We want to do this before normal_stop, | |
3121 | so that the displayed frame is up to date. */ | |
a7aba266 | 3122 | post_create_inferior (from_tty); |
8621d6a9 | 3123 | |
6426a772 | 3124 | normal_stop (); |
c906108c SS |
3125 | } |
3126 | ||
3127 | /* Initialize static vars when a new inferior begins. */ | |
3128 | ||
3129 | void | |
96baa820 | 3130 | init_wait_for_inferior (void) |
c906108c SS |
3131 | { |
3132 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3133 | |
c906108c SS |
3134 | breakpoint_init_inferior (inf_starting); |
3135 | ||
70509625 | 3136 | clear_proceed_status (0); |
9f976b41 | 3137 | |
ab1ddbcf | 3138 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3139 | |
842951eb | 3140 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3141 | } |
237fc4c9 | 3142 | |
c906108c | 3143 | \f |
488f131b | 3144 | |
ec9499be | 3145 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3146 | |
568d6575 UW |
3147 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3148 | struct execution_control_state *ecs); | |
3149 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3150 | struct execution_control_state *ecs); | |
4f5d7f63 | 3151 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3152 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3153 | struct frame_info *); |
611c83ae | 3154 | |
bdc36728 | 3155 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3156 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3157 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3158 | static void process_event_stop_test (struct execution_control_state *ecs); |
c4464ade | 3159 | static bool switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3160 | |
252fbfc8 PA |
3161 | /* This function is attached as a "thread_stop_requested" observer. |
3162 | Cleanup local state that assumed the PTID was to be resumed, and | |
3163 | report the stop to the frontend. */ | |
3164 | ||
2c0b251b | 3165 | static void |
252fbfc8 PA |
3166 | infrun_thread_stop_requested (ptid_t ptid) |
3167 | { | |
5b6d1e4f PA |
3168 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3169 | ||
c65d6b55 PA |
3170 | /* PTID was requested to stop. If the thread was already stopped, |
3171 | but the user/frontend doesn't know about that yet (e.g., the | |
3172 | thread had been temporarily paused for some step-over), set up | |
3173 | for reporting the stop now. */ | |
5b6d1e4f | 3174 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3175 | { |
3176 | if (tp->state != THREAD_RUNNING) | |
3177 | continue; | |
3178 | if (tp->executing) | |
3179 | continue; | |
c65d6b55 | 3180 | |
08036331 PA |
3181 | /* Remove matching threads from the step-over queue, so |
3182 | start_step_over doesn't try to resume them | |
3183 | automatically. */ | |
3184 | if (thread_is_in_step_over_chain (tp)) | |
28d5518b | 3185 | global_thread_step_over_chain_remove (tp); |
c65d6b55 | 3186 | |
08036331 PA |
3187 | /* If the thread is stopped, but the user/frontend doesn't |
3188 | know about that yet, queue a pending event, as if the | |
3189 | thread had just stopped now. Unless the thread already had | |
3190 | a pending event. */ | |
3191 | if (!tp->suspend.waitstatus_pending_p) | |
3192 | { | |
3193 | tp->suspend.waitstatus_pending_p = 1; | |
3194 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3195 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3196 | } | |
c65d6b55 | 3197 | |
08036331 PA |
3198 | /* Clear the inline-frame state, since we're re-processing the |
3199 | stop. */ | |
5b6d1e4f | 3200 | clear_inline_frame_state (tp); |
c65d6b55 | 3201 | |
08036331 PA |
3202 | /* If this thread was paused because some other thread was |
3203 | doing an inline-step over, let that finish first. Once | |
3204 | that happens, we'll restart all threads and consume pending | |
3205 | stop events then. */ | |
3206 | if (step_over_info_valid_p ()) | |
3207 | continue; | |
3208 | ||
3209 | /* Otherwise we can process the (new) pending event now. Set | |
3210 | it so this pending event is considered by | |
3211 | do_target_wait. */ | |
719546c4 | 3212 | tp->resumed = true; |
08036331 | 3213 | } |
252fbfc8 PA |
3214 | } |
3215 | ||
a07daef3 PA |
3216 | static void |
3217 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3218 | { | |
5b6d1e4f PA |
3219 | if (target_last_proc_target == tp->inf->process_target () |
3220 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3221 | nullify_last_target_wait_ptid (); |
3222 | } | |
3223 | ||
0cbcdb96 PA |
3224 | /* Delete the step resume, single-step and longjmp/exception resume |
3225 | breakpoints of TP. */ | |
4e1c45ea | 3226 | |
0cbcdb96 PA |
3227 | static void |
3228 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3229 | { |
0cbcdb96 PA |
3230 | delete_step_resume_breakpoint (tp); |
3231 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3232 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3233 | } |
3234 | ||
0cbcdb96 PA |
3235 | /* If the target still has execution, call FUNC for each thread that |
3236 | just stopped. In all-stop, that's all the non-exited threads; in | |
3237 | non-stop, that's the current thread, only. */ | |
3238 | ||
3239 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3240 | (struct thread_info *tp); | |
4e1c45ea PA |
3241 | |
3242 | static void | |
0cbcdb96 | 3243 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3244 | { |
55f6301a | 3245 | if (!target_has_execution () || inferior_ptid == null_ptid) |
4e1c45ea PA |
3246 | return; |
3247 | ||
fbea99ea | 3248 | if (target_is_non_stop_p ()) |
4e1c45ea | 3249 | { |
0cbcdb96 PA |
3250 | /* If in non-stop mode, only the current thread stopped. */ |
3251 | func (inferior_thread ()); | |
4e1c45ea PA |
3252 | } |
3253 | else | |
0cbcdb96 | 3254 | { |
0cbcdb96 | 3255 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3256 | for (thread_info *tp : all_non_exited_threads ()) |
3257 | func (tp); | |
0cbcdb96 PA |
3258 | } |
3259 | } | |
3260 | ||
3261 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3262 | the threads that just stopped. */ | |
3263 | ||
3264 | static void | |
3265 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3266 | { | |
3267 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3268 | } |
3269 | ||
3270 | /* Delete the single-step breakpoints of the threads that just | |
3271 | stopped. */ | |
7c16b83e | 3272 | |
34b7e8a6 PA |
3273 | static void |
3274 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3275 | { | |
3276 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3277 | } |
3278 | ||
221e1a37 | 3279 | /* See infrun.h. */ |
223698f8 | 3280 | |
221e1a37 | 3281 | void |
223698f8 DE |
3282 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3283 | const struct target_waitstatus *ws) | |
3284 | { | |
e71daf80 SM |
3285 | infrun_debug_printf ("target_wait (%d.%ld.%ld [%s], status) =", |
3286 | waiton_ptid.pid (), | |
3287 | waiton_ptid.lwp (), | |
3288 | waiton_ptid.tid (), | |
3289 | target_pid_to_str (waiton_ptid).c_str ()); | |
3290 | infrun_debug_printf (" %d.%ld.%ld [%s],", | |
3291 | result_ptid.pid (), | |
3292 | result_ptid.lwp (), | |
3293 | result_ptid.tid (), | |
3294 | target_pid_to_str (result_ptid).c_str ()); | |
3295 | infrun_debug_printf (" %s", target_waitstatus_to_string (ws).c_str ()); | |
223698f8 DE |
3296 | } |
3297 | ||
372316f1 PA |
3298 | /* Select a thread at random, out of those which are resumed and have |
3299 | had events. */ | |
3300 | ||
3301 | static struct thread_info * | |
5b6d1e4f | 3302 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3303 | { |
372316f1 | 3304 | int num_events = 0; |
08036331 | 3305 | |
5b6d1e4f | 3306 | auto has_event = [&] (thread_info *tp) |
08036331 | 3307 | { |
5b6d1e4f PA |
3308 | return (tp->ptid.matches (waiton_ptid) |
3309 | && tp->resumed | |
08036331 PA |
3310 | && tp->suspend.waitstatus_pending_p); |
3311 | }; | |
372316f1 PA |
3312 | |
3313 | /* First see how many events we have. Count only resumed threads | |
3314 | that have an event pending. */ | |
5b6d1e4f | 3315 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3316 | if (has_event (tp)) |
372316f1 PA |
3317 | num_events++; |
3318 | ||
3319 | if (num_events == 0) | |
3320 | return NULL; | |
3321 | ||
3322 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3323 | int random_selector = (int) ((num_events * (double) rand ()) |
3324 | / (RAND_MAX + 1.0)); | |
372316f1 | 3325 | |
1eb8556f SM |
3326 | if (num_events > 1) |
3327 | infrun_debug_printf ("Found %d events, selecting #%d", | |
3328 | num_events, random_selector); | |
372316f1 PA |
3329 | |
3330 | /* Select the Nth thread that has had an event. */ | |
5b6d1e4f | 3331 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3332 | if (has_event (tp)) |
372316f1 | 3333 | if (random_selector-- == 0) |
08036331 | 3334 | return tp; |
372316f1 | 3335 | |
08036331 | 3336 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3337 | } |
3338 | ||
3339 | /* Wrapper for target_wait that first checks whether threads have | |
3340 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3341 | more events. INF is the inferior we're using to call target_wait |
3342 | on. */ | |
372316f1 PA |
3343 | |
3344 | static ptid_t | |
5b6d1e4f | 3345 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
b60cea74 | 3346 | target_waitstatus *status, target_wait_flags options) |
372316f1 PA |
3347 | { |
3348 | ptid_t event_ptid; | |
3349 | struct thread_info *tp; | |
3350 | ||
24ed6739 AB |
3351 | /* We know that we are looking for an event in the target of inferior |
3352 | INF, but we don't know which thread the event might come from. As | |
3353 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3354 | the wait code relies on it - doing so is always a mistake. */ | |
3355 | switch_to_inferior_no_thread (inf); | |
3356 | ||
372316f1 PA |
3357 | /* First check if there is a resumed thread with a wait status |
3358 | pending. */ | |
d7e15655 | 3359 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3360 | { |
5b6d1e4f | 3361 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3362 | } |
3363 | else | |
3364 | { | |
1eb8556f SM |
3365 | infrun_debug_printf ("Waiting for specific thread %s.", |
3366 | target_pid_to_str (ptid).c_str ()); | |
372316f1 PA |
3367 | |
3368 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3369 | tp = find_thread_ptid (inf, ptid); |
372316f1 PA |
3370 | gdb_assert (tp != NULL); |
3371 | if (!tp->suspend.waitstatus_pending_p) | |
3372 | tp = NULL; | |
3373 | } | |
3374 | ||
3375 | if (tp != NULL | |
3376 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3377 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3378 | { | |
00431a78 | 3379 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3380 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3381 | CORE_ADDR pc; |
3382 | int discard = 0; | |
3383 | ||
3384 | pc = regcache_read_pc (regcache); | |
3385 | ||
3386 | if (pc != tp->suspend.stop_pc) | |
3387 | { | |
1eb8556f SM |
3388 | infrun_debug_printf ("PC of %s changed. was=%s, now=%s", |
3389 | target_pid_to_str (tp->ptid).c_str (), | |
3390 | paddress (gdbarch, tp->suspend.stop_pc), | |
3391 | paddress (gdbarch, pc)); | |
372316f1 PA |
3392 | discard = 1; |
3393 | } | |
a01bda52 | 3394 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 | 3395 | { |
1eb8556f SM |
3396 | infrun_debug_printf ("previous breakpoint of %s, at %s gone", |
3397 | target_pid_to_str (tp->ptid).c_str (), | |
3398 | paddress (gdbarch, pc)); | |
372316f1 PA |
3399 | |
3400 | discard = 1; | |
3401 | } | |
3402 | ||
3403 | if (discard) | |
3404 | { | |
1eb8556f SM |
3405 | infrun_debug_printf ("pending event of %s cancelled.", |
3406 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3407 | |
3408 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3409 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3410 | } | |
3411 | } | |
3412 | ||
3413 | if (tp != NULL) | |
3414 | { | |
1eb8556f SM |
3415 | infrun_debug_printf ("Using pending wait status %s for %s.", |
3416 | target_waitstatus_to_string | |
3417 | (&tp->suspend.waitstatus).c_str (), | |
3418 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3419 | |
3420 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3421 | if it was a software breakpoint (and the target doesn't | |
3422 | always adjust the PC itself). */ | |
3423 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3424 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3425 | { | |
3426 | struct regcache *regcache; | |
3427 | struct gdbarch *gdbarch; | |
3428 | int decr_pc; | |
3429 | ||
00431a78 | 3430 | regcache = get_thread_regcache (tp); |
ac7936df | 3431 | gdbarch = regcache->arch (); |
372316f1 PA |
3432 | |
3433 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3434 | if (decr_pc != 0) | |
3435 | { | |
3436 | CORE_ADDR pc; | |
3437 | ||
3438 | pc = regcache_read_pc (regcache); | |
3439 | regcache_write_pc (regcache, pc + decr_pc); | |
3440 | } | |
3441 | } | |
3442 | ||
3443 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3444 | *status = tp->suspend.waitstatus; | |
3445 | tp->suspend.waitstatus_pending_p = 0; | |
3446 | ||
3447 | /* Wake up the event loop again, until all pending events are | |
3448 | processed. */ | |
3449 | if (target_is_async_p ()) | |
3450 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3451 | return tp->ptid; | |
3452 | } | |
3453 | ||
3454 | /* But if we don't find one, we'll have to wait. */ | |
3455 | ||
d3a07122 SM |
3456 | /* We can't ask a non-async target to do a non-blocking wait, so this will be |
3457 | a blocking wait. */ | |
3458 | if (!target_can_async_p ()) | |
3459 | options &= ~TARGET_WNOHANG; | |
3460 | ||
372316f1 PA |
3461 | if (deprecated_target_wait_hook) |
3462 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3463 | else | |
3464 | event_ptid = target_wait (ptid, status, options); | |
3465 | ||
3466 | return event_ptid; | |
3467 | } | |
3468 | ||
5b6d1e4f PA |
3469 | /* Wrapper for target_wait that first checks whether threads have |
3470 | pending statuses to report before actually asking the target for | |
b3e3a4c1 | 3471 | more events. Polls for events from all inferiors/targets. */ |
5b6d1e4f PA |
3472 | |
3473 | static bool | |
b60cea74 TT |
3474 | do_target_wait (ptid_t wait_ptid, execution_control_state *ecs, |
3475 | target_wait_flags options) | |
5b6d1e4f PA |
3476 | { |
3477 | int num_inferiors = 0; | |
3478 | int random_selector; | |
3479 | ||
b3e3a4c1 SM |
3480 | /* For fairness, we pick the first inferior/target to poll at random |
3481 | out of all inferiors that may report events, and then continue | |
3482 | polling the rest of the inferior list starting from that one in a | |
3483 | circular fashion until the whole list is polled once. */ | |
5b6d1e4f PA |
3484 | |
3485 | auto inferior_matches = [&wait_ptid] (inferior *inf) | |
3486 | { | |
3487 | return (inf->process_target () != NULL | |
5b6d1e4f PA |
3488 | && ptid_t (inf->pid).matches (wait_ptid)); |
3489 | }; | |
3490 | ||
b3e3a4c1 | 3491 | /* First see how many matching inferiors we have. */ |
5b6d1e4f PA |
3492 | for (inferior *inf : all_inferiors ()) |
3493 | if (inferior_matches (inf)) | |
3494 | num_inferiors++; | |
3495 | ||
3496 | if (num_inferiors == 0) | |
3497 | { | |
3498 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3499 | return false; | |
3500 | } | |
3501 | ||
b3e3a4c1 | 3502 | /* Now randomly pick an inferior out of those that matched. */ |
5b6d1e4f PA |
3503 | random_selector = (int) |
3504 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3505 | ||
1eb8556f SM |
3506 | if (num_inferiors > 1) |
3507 | infrun_debug_printf ("Found %d inferiors, starting at #%d", | |
3508 | num_inferiors, random_selector); | |
5b6d1e4f | 3509 | |
b3e3a4c1 | 3510 | /* Select the Nth inferior that matched. */ |
5b6d1e4f PA |
3511 | |
3512 | inferior *selected = nullptr; | |
3513 | ||
3514 | for (inferior *inf : all_inferiors ()) | |
3515 | if (inferior_matches (inf)) | |
3516 | if (random_selector-- == 0) | |
3517 | { | |
3518 | selected = inf; | |
3519 | break; | |
3520 | } | |
3521 | ||
b3e3a4c1 | 3522 | /* Now poll for events out of each of the matching inferior's |
5b6d1e4f PA |
3523 | targets, starting from the selected one. */ |
3524 | ||
3525 | auto do_wait = [&] (inferior *inf) | |
3526 | { | |
5b6d1e4f PA |
3527 | ecs->ptid = do_target_wait_1 (inf, wait_ptid, &ecs->ws, options); |
3528 | ecs->target = inf->process_target (); | |
3529 | return (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3530 | }; | |
3531 | ||
b3e3a4c1 SM |
3532 | /* Needed in 'all-stop + target-non-stop' mode, because we end up |
3533 | here spuriously after the target is all stopped and we've already | |
5b6d1e4f PA |
3534 | reported the stop to the user, polling for events. */ |
3535 | scoped_restore_current_thread restore_thread; | |
3536 | ||
3537 | int inf_num = selected->num; | |
3538 | for (inferior *inf = selected; inf != NULL; inf = inf->next) | |
3539 | if (inferior_matches (inf)) | |
3540 | if (do_wait (inf)) | |
3541 | return true; | |
3542 | ||
3543 | for (inferior *inf = inferior_list; | |
3544 | inf != NULL && inf->num < inf_num; | |
3545 | inf = inf->next) | |
3546 | if (inferior_matches (inf)) | |
3547 | if (do_wait (inf)) | |
3548 | return true; | |
3549 | ||
3550 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3551 | return false; | |
3552 | } | |
3553 | ||
8ff53139 PA |
3554 | /* An event reported by wait_one. */ |
3555 | ||
3556 | struct wait_one_event | |
3557 | { | |
3558 | /* The target the event came out of. */ | |
3559 | process_stratum_target *target; | |
3560 | ||
3561 | /* The PTID the event was for. */ | |
3562 | ptid_t ptid; | |
3563 | ||
3564 | /* The waitstatus. */ | |
3565 | target_waitstatus ws; | |
3566 | }; | |
3567 | ||
3568 | static bool handle_one (const wait_one_event &event); | |
ac7d717c | 3569 | static void restart_threads (struct thread_info *event_thread); |
8ff53139 | 3570 | |
24291992 PA |
3571 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3572 | detaching while a thread is displaced stepping is a recipe for | |
3573 | crashing it, as nothing would readjust the PC out of the scratch | |
3574 | pad. */ | |
3575 | ||
3576 | void | |
3577 | prepare_for_detach (void) | |
3578 | { | |
3579 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3580 | ptid_t pid_ptid = ptid_t (inf->pid); |
8ff53139 | 3581 | scoped_restore_current_thread restore_thread; |
24291992 | 3582 | |
9bcb1f16 | 3583 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3584 | |
8ff53139 PA |
3585 | /* Remove all threads of INF from the global step-over chain. We |
3586 | want to stop any ongoing step-over, not start any new one. */ | |
3587 | thread_info *next; | |
3588 | for (thread_info *tp = global_thread_step_over_chain_head; | |
3589 | tp != nullptr; | |
3590 | tp = next) | |
24291992 | 3591 | { |
8ff53139 PA |
3592 | next = global_thread_step_over_chain_next (tp); |
3593 | if (tp->inf == inf) | |
3594 | global_thread_step_over_chain_remove (tp); | |
3595 | } | |
24291992 | 3596 | |
ac7d717c PA |
3597 | /* If we were already in the middle of an inline step-over, and the |
3598 | thread stepping belongs to the inferior we're detaching, we need | |
3599 | to restart the threads of other inferiors. */ | |
3600 | if (step_over_info.thread != -1) | |
3601 | { | |
3602 | infrun_debug_printf ("inline step-over in-process while detaching"); | |
3603 | ||
3604 | thread_info *thr = find_thread_global_id (step_over_info.thread); | |
3605 | if (thr->inf == inf) | |
3606 | { | |
3607 | /* Since we removed threads of INF from the step-over chain, | |
3608 | we know this won't start a step-over for INF. */ | |
3609 | clear_step_over_info (); | |
3610 | ||
3611 | if (target_is_non_stop_p ()) | |
3612 | { | |
3613 | /* Start a new step-over in another thread if there's | |
3614 | one that needs it. */ | |
3615 | start_step_over (); | |
3616 | ||
3617 | /* Restart all other threads (except the | |
3618 | previously-stepping thread, since that one is still | |
3619 | running). */ | |
3620 | if (!step_over_info_valid_p ()) | |
3621 | restart_threads (thr); | |
3622 | } | |
3623 | } | |
3624 | } | |
3625 | ||
8ff53139 PA |
3626 | if (displaced_step_in_progress (inf)) |
3627 | { | |
3628 | infrun_debug_printf ("displaced-stepping in-process while detaching"); | |
24291992 | 3629 | |
8ff53139 | 3630 | /* Stop threads currently displaced stepping, aborting it. */ |
24291992 | 3631 | |
8ff53139 PA |
3632 | for (thread_info *thr : inf->non_exited_threads ()) |
3633 | { | |
3634 | if (thr->displaced_step_state.in_progress ()) | |
3635 | { | |
3636 | if (thr->executing) | |
3637 | { | |
3638 | if (!thr->stop_requested) | |
3639 | { | |
3640 | target_stop (thr->ptid); | |
3641 | thr->stop_requested = true; | |
3642 | } | |
3643 | } | |
3644 | else | |
3645 | thr->resumed = false; | |
3646 | } | |
3647 | } | |
24291992 | 3648 | |
8ff53139 PA |
3649 | while (displaced_step_in_progress (inf)) |
3650 | { | |
3651 | wait_one_event event; | |
24291992 | 3652 | |
8ff53139 PA |
3653 | event.target = inf->process_target (); |
3654 | event.ptid = do_target_wait_1 (inf, pid_ptid, &event.ws, 0); | |
24291992 | 3655 | |
8ff53139 PA |
3656 | if (debug_infrun) |
3657 | print_target_wait_results (pid_ptid, event.ptid, &event.ws); | |
24291992 | 3658 | |
8ff53139 PA |
3659 | handle_one (event); |
3660 | } | |
24291992 | 3661 | |
8ff53139 PA |
3662 | /* It's OK to leave some of the threads of INF stopped, since |
3663 | they'll be detached shortly. */ | |
24291992 | 3664 | } |
24291992 PA |
3665 | } |
3666 | ||
cd0fc7c3 | 3667 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3668 | |
cd0fc7c3 SS |
3669 | If inferior gets a signal, we may decide to start it up again |
3670 | instead of returning. That is why there is a loop in this function. | |
3671 | When this function actually returns it means the inferior | |
3672 | should be left stopped and GDB should read more commands. */ | |
3673 | ||
5b6d1e4f PA |
3674 | static void |
3675 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3676 | { |
1eb8556f | 3677 | infrun_debug_printf ("wait_for_inferior ()"); |
527159b7 | 3678 | |
4c41382a | 3679 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3680 | |
e6f5c25b PA |
3681 | /* If an error happens while handling the event, propagate GDB's |
3682 | knowledge of the executing state to the frontend/user running | |
3683 | state. */ | |
5b6d1e4f PA |
3684 | scoped_finish_thread_state finish_state |
3685 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 3686 | |
c906108c SS |
3687 | while (1) |
3688 | { | |
ae25568b PA |
3689 | struct execution_control_state ecss; |
3690 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 3691 | |
ae25568b PA |
3692 | memset (ecs, 0, sizeof (*ecs)); |
3693 | ||
ec9499be | 3694 | overlay_cache_invalid = 1; |
ec9499be | 3695 | |
f15cb84a YQ |
3696 | /* Flush target cache before starting to handle each event. |
3697 | Target was running and cache could be stale. This is just a | |
3698 | heuristic. Running threads may modify target memory, but we | |
3699 | don't get any event. */ | |
3700 | target_dcache_invalidate (); | |
3701 | ||
5b6d1e4f PA |
3702 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
3703 | ecs->target = inf->process_target (); | |
c906108c | 3704 | |
f00150c9 | 3705 | if (debug_infrun) |
5b6d1e4f | 3706 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3707 | |
cd0fc7c3 SS |
3708 | /* Now figure out what to do with the result of the result. */ |
3709 | handle_inferior_event (ecs); | |
c906108c | 3710 | |
cd0fc7c3 SS |
3711 | if (!ecs->wait_some_more) |
3712 | break; | |
3713 | } | |
4e1c45ea | 3714 | |
e6f5c25b | 3715 | /* No error, don't finish the state yet. */ |
731f534f | 3716 | finish_state.release (); |
cd0fc7c3 | 3717 | } |
c906108c | 3718 | |
d3d4baed PA |
3719 | /* Cleanup that reinstalls the readline callback handler, if the |
3720 | target is running in the background. If while handling the target | |
3721 | event something triggered a secondary prompt, like e.g., a | |
3722 | pagination prompt, we'll have removed the callback handler (see | |
3723 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3724 | event loop, ready to process further input. Note this has no | |
3725 | effect if the handler hasn't actually been removed, because calling | |
3726 | rl_callback_handler_install resets the line buffer, thus losing | |
3727 | input. */ | |
3728 | ||
3729 | static void | |
d238133d | 3730 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 3731 | { |
3b12939d PA |
3732 | struct ui *ui = current_ui; |
3733 | ||
3734 | if (!ui->async) | |
6c400b59 PA |
3735 | { |
3736 | /* We're not going back to the top level event loop yet. Don't | |
3737 | install the readline callback, as it'd prep the terminal, | |
3738 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3739 | it the next time the prompt is displayed, when we're ready | |
3740 | for input. */ | |
3741 | return; | |
3742 | } | |
3743 | ||
3b12939d | 3744 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3745 | gdb_rl_callback_handler_reinstall (); |
3746 | } | |
3747 | ||
243a9253 PA |
3748 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3749 | that's just the event thread. In all-stop, that's all threads. */ | |
3750 | ||
3751 | static void | |
3752 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3753 | { | |
08036331 PA |
3754 | if (ecs->event_thread != NULL |
3755 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 3756 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
3757 | |
3758 | if (!non_stop) | |
3759 | { | |
08036331 | 3760 | for (thread_info *thr : all_non_exited_threads ()) |
dda83cd7 | 3761 | { |
243a9253 PA |
3762 | if (thr->thread_fsm == NULL) |
3763 | continue; | |
3764 | if (thr == ecs->event_thread) | |
3765 | continue; | |
3766 | ||
00431a78 | 3767 | switch_to_thread (thr); |
46e3ed7f | 3768 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
3769 | } |
3770 | ||
3771 | if (ecs->event_thread != NULL) | |
00431a78 | 3772 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3773 | } |
3774 | } | |
3775 | ||
3b12939d PA |
3776 | /* Helper for all_uis_check_sync_execution_done that works on the |
3777 | current UI. */ | |
3778 | ||
3779 | static void | |
3780 | check_curr_ui_sync_execution_done (void) | |
3781 | { | |
3782 | struct ui *ui = current_ui; | |
3783 | ||
3784 | if (ui->prompt_state == PROMPT_NEEDED | |
3785 | && ui->async | |
3786 | && !gdb_in_secondary_prompt_p (ui)) | |
3787 | { | |
223ffa71 | 3788 | target_terminal::ours (); |
76727919 | 3789 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3790 | ui_register_input_event_handler (ui); |
3b12939d PA |
3791 | } |
3792 | } | |
3793 | ||
3794 | /* See infrun.h. */ | |
3795 | ||
3796 | void | |
3797 | all_uis_check_sync_execution_done (void) | |
3798 | { | |
0e454242 | 3799 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3800 | { |
3801 | check_curr_ui_sync_execution_done (); | |
3802 | } | |
3803 | } | |
3804 | ||
a8836c93 PA |
3805 | /* See infrun.h. */ |
3806 | ||
3807 | void | |
3808 | all_uis_on_sync_execution_starting (void) | |
3809 | { | |
0e454242 | 3810 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3811 | { |
3812 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3813 | async_disable_stdin (); | |
3814 | } | |
3815 | } | |
3816 | ||
1777feb0 | 3817 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3818 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3819 | descriptor corresponding to the target. It can be called more than |
3820 | once to complete a single execution command. In such cases we need | |
3821 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3822 | that this function is called for a single execution command, then |
3823 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3824 | necessary cleanups. */ |
43ff13b4 JM |
3825 | |
3826 | void | |
b1a35af2 | 3827 | fetch_inferior_event () |
43ff13b4 | 3828 | { |
3ec3145c SM |
3829 | INFRUN_SCOPED_DEBUG_ENTER_EXIT; |
3830 | ||
0d1e5fa7 | 3831 | struct execution_control_state ecss; |
a474d7c2 | 3832 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 3833 | int cmd_done = 0; |
43ff13b4 | 3834 | |
0d1e5fa7 PA |
3835 | memset (ecs, 0, sizeof (*ecs)); |
3836 | ||
c61db772 PA |
3837 | /* Events are always processed with the main UI as current UI. This |
3838 | way, warnings, debug output, etc. are always consistently sent to | |
3839 | the main console. */ | |
4b6749b9 | 3840 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3841 | |
b78b3a29 TBA |
3842 | /* Temporarily disable pagination. Otherwise, the user would be |
3843 | given an option to press 'q' to quit, which would cause an early | |
3844 | exit and could leave GDB in a half-baked state. */ | |
3845 | scoped_restore save_pagination | |
3846 | = make_scoped_restore (&pagination_enabled, false); | |
3847 | ||
d3d4baed | 3848 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
3849 | { |
3850 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
3851 | ||
3852 | /* We're handling a live event, so make sure we're doing live | |
3853 | debugging. If we're looking at traceframes while the target is | |
3854 | running, we're going to need to get back to that mode after | |
3855 | handling the event. */ | |
3856 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
3857 | if (non_stop) | |
3858 | { | |
3859 | maybe_restore_traceframe.emplace (); | |
3860 | set_current_traceframe (-1); | |
3861 | } | |
43ff13b4 | 3862 | |
873657b9 PA |
3863 | /* The user/frontend should not notice a thread switch due to |
3864 | internal events. Make sure we revert to the user selected | |
3865 | thread and frame after handling the event and running any | |
3866 | breakpoint commands. */ | |
3867 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
3868 | |
3869 | overlay_cache_invalid = 1; | |
3870 | /* Flush target cache before starting to handle each event. Target | |
3871 | was running and cache could be stale. This is just a heuristic. | |
3872 | Running threads may modify target memory, but we don't get any | |
3873 | event. */ | |
3874 | target_dcache_invalidate (); | |
3875 | ||
3876 | scoped_restore save_exec_dir | |
3877 | = make_scoped_restore (&execution_direction, | |
3878 | target_execution_direction ()); | |
3879 | ||
5b6d1e4f PA |
3880 | if (!do_target_wait (minus_one_ptid, ecs, TARGET_WNOHANG)) |
3881 | return; | |
3882 | ||
3883 | gdb_assert (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3884 | ||
3885 | /* Switch to the target that generated the event, so we can do | |
7f08fd51 TBA |
3886 | target calls. */ |
3887 | switch_to_target_no_thread (ecs->target); | |
d238133d TT |
3888 | |
3889 | if (debug_infrun) | |
5b6d1e4f | 3890 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
d238133d TT |
3891 | |
3892 | /* If an error happens while handling the event, propagate GDB's | |
3893 | knowledge of the executing state to the frontend/user running | |
3894 | state. */ | |
3895 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 3896 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 3897 | |
979a0d13 | 3898 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
3899 | still for the thread which has thrown the exception. */ |
3900 | auto defer_bpstat_clear | |
3901 | = make_scope_exit (bpstat_clear_actions); | |
3902 | auto defer_delete_threads | |
3903 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
3904 | ||
3905 | /* Now figure out what to do with the result of the result. */ | |
3906 | handle_inferior_event (ecs); | |
3907 | ||
3908 | if (!ecs->wait_some_more) | |
3909 | { | |
5b6d1e4f | 3910 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
758cb810 | 3911 | bool should_stop = true; |
d238133d | 3912 | struct thread_info *thr = ecs->event_thread; |
d6b48e9c | 3913 | |
d238133d | 3914 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3915 | |
d238133d TT |
3916 | if (thr != NULL) |
3917 | { | |
3918 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 3919 | |
d238133d | 3920 | if (thread_fsm != NULL) |
46e3ed7f | 3921 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 3922 | } |
243a9253 | 3923 | |
d238133d TT |
3924 | if (!should_stop) |
3925 | { | |
3926 | keep_going (ecs); | |
3927 | } | |
3928 | else | |
3929 | { | |
46e3ed7f | 3930 | bool should_notify_stop = true; |
d238133d | 3931 | int proceeded = 0; |
1840d81a | 3932 | |
d238133d | 3933 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 3934 | |
d238133d | 3935 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 3936 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 3937 | |
d238133d TT |
3938 | if (should_notify_stop) |
3939 | { | |
3940 | /* We may not find an inferior if this was a process exit. */ | |
3941 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
3942 | proceeded = normal_stop (); | |
3943 | } | |
243a9253 | 3944 | |
d238133d TT |
3945 | if (!proceeded) |
3946 | { | |
b1a35af2 | 3947 | inferior_event_handler (INF_EXEC_COMPLETE); |
d238133d TT |
3948 | cmd_done = 1; |
3949 | } | |
873657b9 PA |
3950 | |
3951 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
3952 | previously selected thread is gone. We have two | |
3953 | choices - switch to no thread selected, or restore the | |
3954 | previously selected thread (now exited). We chose the | |
3955 | later, just because that's what GDB used to do. After | |
3956 | this, "info threads" says "The current thread <Thread | |
3957 | ID 2> has terminated." instead of "No thread | |
3958 | selected.". */ | |
3959 | if (!non_stop | |
3960 | && cmd_done | |
3961 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
3962 | restore_thread.dont_restore (); | |
d238133d TT |
3963 | } |
3964 | } | |
4f8d22e3 | 3965 | |
d238133d TT |
3966 | defer_delete_threads.release (); |
3967 | defer_bpstat_clear.release (); | |
29f49a6a | 3968 | |
d238133d TT |
3969 | /* No error, don't finish the thread states yet. */ |
3970 | finish_state.release (); | |
731f534f | 3971 | |
d238133d TT |
3972 | /* This scope is used to ensure that readline callbacks are |
3973 | reinstalled here. */ | |
3974 | } | |
4f8d22e3 | 3975 | |
3b12939d PA |
3976 | /* If a UI was in sync execution mode, and now isn't, restore its |
3977 | prompt (a synchronous execution command has finished, and we're | |
3978 | ready for input). */ | |
3979 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
3980 | |
3981 | if (cmd_done | |
0f641c01 | 3982 | && exec_done_display_p |
00431a78 PA |
3983 | && (inferior_ptid == null_ptid |
3984 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 3985 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
3986 | } |
3987 | ||
29734269 SM |
3988 | /* See infrun.h. */ |
3989 | ||
edb3359d | 3990 | void |
29734269 SM |
3991 | set_step_info (thread_info *tp, struct frame_info *frame, |
3992 | struct symtab_and_line sal) | |
edb3359d | 3993 | { |
29734269 SM |
3994 | /* This can be removed once this function no longer implicitly relies on the |
3995 | inferior_ptid value. */ | |
3996 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 3997 | |
16c381f0 JK |
3998 | tp->control.step_frame_id = get_frame_id (frame); |
3999 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4000 | |
4001 | tp->current_symtab = sal.symtab; | |
4002 | tp->current_line = sal.line; | |
4003 | } | |
4004 | ||
0d1e5fa7 PA |
4005 | /* Clear context switchable stepping state. */ |
4006 | ||
4007 | void | |
4e1c45ea | 4008 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4009 | { |
7f5ef605 | 4010 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4011 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4012 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4013 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4014 | } |
4015 | ||
ab1ddbcf | 4016 | /* See infrun.h. */ |
c32c64b7 | 4017 | |
6efcd9a8 | 4018 | void |
5b6d1e4f PA |
4019 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
4020 | target_waitstatus status) | |
c32c64b7 | 4021 | { |
5b6d1e4f | 4022 | target_last_proc_target = target; |
c32c64b7 DE |
4023 | target_last_wait_ptid = ptid; |
4024 | target_last_waitstatus = status; | |
4025 | } | |
4026 | ||
ab1ddbcf | 4027 | /* See infrun.h. */ |
e02bc4cc DS |
4028 | |
4029 | void | |
5b6d1e4f PA |
4030 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4031 | target_waitstatus *status) | |
e02bc4cc | 4032 | { |
5b6d1e4f PA |
4033 | if (target != nullptr) |
4034 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4035 | if (ptid != nullptr) |
4036 | *ptid = target_last_wait_ptid; | |
4037 | if (status != nullptr) | |
4038 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4039 | } |
4040 | ||
ab1ddbcf PA |
4041 | /* See infrun.h. */ |
4042 | ||
ac264b3b MS |
4043 | void |
4044 | nullify_last_target_wait_ptid (void) | |
4045 | { | |
5b6d1e4f | 4046 | target_last_proc_target = nullptr; |
ac264b3b | 4047 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4048 | target_last_waitstatus = {}; |
ac264b3b MS |
4049 | } |
4050 | ||
dcf4fbde | 4051 | /* Switch thread contexts. */ |
dd80620e MS |
4052 | |
4053 | static void | |
00431a78 | 4054 | context_switch (execution_control_state *ecs) |
dd80620e | 4055 | { |
1eb8556f | 4056 | if (ecs->ptid != inferior_ptid |
5b6d1e4f PA |
4057 | && (inferior_ptid == null_ptid |
4058 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 | 4059 | { |
1eb8556f SM |
4060 | infrun_debug_printf ("Switching context from %s to %s", |
4061 | target_pid_to_str (inferior_ptid).c_str (), | |
4062 | target_pid_to_str (ecs->ptid).c_str ()); | |
fd48f117 DJ |
4063 | } |
4064 | ||
00431a78 | 4065 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4066 | } |
4067 | ||
d8dd4d5f PA |
4068 | /* If the target can't tell whether we've hit breakpoints |
4069 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4070 | check whether that could have been caused by a breakpoint. If so, | |
4071 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4072 | ||
4fa8626c | 4073 | static void |
d8dd4d5f PA |
4074 | adjust_pc_after_break (struct thread_info *thread, |
4075 | struct target_waitstatus *ws) | |
4fa8626c | 4076 | { |
24a73cce UW |
4077 | struct regcache *regcache; |
4078 | struct gdbarch *gdbarch; | |
118e6252 | 4079 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4080 | |
4fa8626c DJ |
4081 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4082 | we aren't, just return. | |
9709f61c DJ |
4083 | |
4084 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4085 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4086 | implemented by software breakpoints should be handled through the normal | |
4087 | breakpoint layer. | |
8fb3e588 | 4088 | |
4fa8626c DJ |
4089 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4090 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4091 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4092 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4093 | generates these signals at breakpoints (the code has been in GDB since at | |
4094 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4095 | |
e6cf7916 UW |
4096 | In earlier versions of GDB, a target with |
4097 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4098 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4099 | target with both of these set in GDB history, and it seems unlikely to be | |
4100 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4101 | |
d8dd4d5f | 4102 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4103 | return; |
4104 | ||
d8dd4d5f | 4105 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4106 | return; |
4107 | ||
4058b839 PA |
4108 | /* In reverse execution, when a breakpoint is hit, the instruction |
4109 | under it has already been de-executed. The reported PC always | |
4110 | points at the breakpoint address, so adjusting it further would | |
4111 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4112 | architecture: | |
4113 | ||
4114 | B1 0x08000000 : INSN1 | |
4115 | B2 0x08000001 : INSN2 | |
4116 | 0x08000002 : INSN3 | |
4117 | PC -> 0x08000003 : INSN4 | |
4118 | ||
4119 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4120 | from that point should hit B2 as below. Reading the PC when the | |
4121 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4122 | been de-executed already. | |
4123 | ||
4124 | B1 0x08000000 : INSN1 | |
4125 | B2 PC -> 0x08000001 : INSN2 | |
4126 | 0x08000002 : INSN3 | |
4127 | 0x08000003 : INSN4 | |
4128 | ||
4129 | We can't apply the same logic as for forward execution, because | |
4130 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4131 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4132 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4133 | behaviour. */ | |
4134 | if (execution_direction == EXEC_REVERSE) | |
4135 | return; | |
4136 | ||
1cf4d951 PA |
4137 | /* If the target can tell whether the thread hit a SW breakpoint, |
4138 | trust it. Targets that can tell also adjust the PC | |
4139 | themselves. */ | |
4140 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4141 | return; | |
4142 | ||
4143 | /* Note that relying on whether a breakpoint is planted in memory to | |
4144 | determine this can fail. E.g,. the breakpoint could have been | |
4145 | removed since. Or the thread could have been told to step an | |
4146 | instruction the size of a breakpoint instruction, and only | |
4147 | _after_ was a breakpoint inserted at its address. */ | |
4148 | ||
24a73cce UW |
4149 | /* If this target does not decrement the PC after breakpoints, then |
4150 | we have nothing to do. */ | |
00431a78 | 4151 | regcache = get_thread_regcache (thread); |
ac7936df | 4152 | gdbarch = regcache->arch (); |
118e6252 | 4153 | |
527a273a | 4154 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4155 | if (decr_pc == 0) |
24a73cce UW |
4156 | return; |
4157 | ||
8b86c959 | 4158 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4159 | |
8aad930b AC |
4160 | /* Find the location where (if we've hit a breakpoint) the |
4161 | breakpoint would be. */ | |
118e6252 | 4162 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4163 | |
1cf4d951 PA |
4164 | /* If the target can't tell whether a software breakpoint triggered, |
4165 | fallback to figuring it out based on breakpoints we think were | |
4166 | inserted in the target, and on whether the thread was stepped or | |
4167 | continued. */ | |
4168 | ||
1c5cfe86 PA |
4169 | /* Check whether there actually is a software breakpoint inserted at |
4170 | that location. | |
4171 | ||
4172 | If in non-stop mode, a race condition is possible where we've | |
4173 | removed a breakpoint, but stop events for that breakpoint were | |
4174 | already queued and arrive later. To suppress those spurious | |
4175 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4176 | and retire them after a number of stop events are reported. Note |
4177 | this is an heuristic and can thus get confused. The real fix is | |
4178 | to get the "stopped by SW BP and needs adjustment" info out of | |
4179 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4180 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4181 | || (target_is_non_stop_p () |
4182 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4183 | { |
07036511 | 4184 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4185 | |
8213266a | 4186 | if (record_full_is_used ()) |
07036511 TT |
4187 | restore_operation_disable.emplace |
4188 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4189 | |
1c0fdd0e UW |
4190 | /* When using hardware single-step, a SIGTRAP is reported for both |
4191 | a completed single-step and a software breakpoint. Need to | |
4192 | differentiate between the two, as the latter needs adjusting | |
4193 | but the former does not. | |
4194 | ||
4195 | The SIGTRAP can be due to a completed hardware single-step only if | |
4196 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4197 | - this thread is currently being stepped |
4198 | ||
4199 | If any of these events did not occur, we must have stopped due | |
4200 | to hitting a software breakpoint, and have to back up to the | |
4201 | breakpoint address. | |
4202 | ||
4203 | As a special case, we could have hardware single-stepped a | |
4204 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4205 | we also need to back up to the breakpoint address. */ | |
4206 | ||
d8dd4d5f PA |
4207 | if (thread_has_single_step_breakpoints_set (thread) |
4208 | || !currently_stepping (thread) | |
4209 | || (thread->stepped_breakpoint | |
4210 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4211 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4212 | } |
4fa8626c DJ |
4213 | } |
4214 | ||
c4464ade | 4215 | static bool |
edb3359d DJ |
4216 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) |
4217 | { | |
4218 | for (frame = get_prev_frame (frame); | |
4219 | frame != NULL; | |
4220 | frame = get_prev_frame (frame)) | |
4221 | { | |
4222 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
c4464ade SM |
4223 | return true; |
4224 | ||
edb3359d DJ |
4225 | if (get_frame_type (frame) != INLINE_FRAME) |
4226 | break; | |
4227 | } | |
4228 | ||
c4464ade | 4229 | return false; |
edb3359d DJ |
4230 | } |
4231 | ||
4a4c04f1 BE |
4232 | /* Look for an inline frame that is marked for skip. |
4233 | If PREV_FRAME is TRUE start at the previous frame, | |
4234 | otherwise start at the current frame. Stop at the | |
4235 | first non-inline frame, or at the frame where the | |
4236 | step started. */ | |
4237 | ||
4238 | static bool | |
4239 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4240 | { | |
4241 | struct frame_info *frame = get_current_frame (); | |
4242 | ||
4243 | if (prev_frame) | |
4244 | frame = get_prev_frame (frame); | |
4245 | ||
4246 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4247 | { | |
4248 | const char *fn = NULL; | |
4249 | symtab_and_line sal; | |
4250 | struct symbol *sym; | |
4251 | ||
4252 | if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id)) | |
4253 | break; | |
4254 | if (get_frame_type (frame) != INLINE_FRAME) | |
4255 | break; | |
4256 | ||
4257 | sal = find_frame_sal (frame); | |
4258 | sym = get_frame_function (frame); | |
4259 | ||
4260 | if (sym != NULL) | |
4261 | fn = sym->print_name (); | |
4262 | ||
4263 | if (sal.line != 0 | |
4264 | && function_name_is_marked_for_skip (fn, sal)) | |
4265 | return true; | |
4266 | } | |
4267 | ||
4268 | return false; | |
4269 | } | |
4270 | ||
c65d6b55 PA |
4271 | /* If the event thread has the stop requested flag set, pretend it |
4272 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4273 | target_stop). */ | |
4274 | ||
4275 | static bool | |
4276 | handle_stop_requested (struct execution_control_state *ecs) | |
4277 | { | |
4278 | if (ecs->event_thread->stop_requested) | |
4279 | { | |
4280 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4281 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4282 | handle_signal_stop (ecs); | |
4283 | return true; | |
4284 | } | |
4285 | return false; | |
4286 | } | |
4287 | ||
a96d9b2e | 4288 | /* Auxiliary function that handles syscall entry/return events. |
c4464ade SM |
4289 | It returns true if the inferior should keep going (and GDB |
4290 | should ignore the event), or false if the event deserves to be | |
a96d9b2e | 4291 | processed. */ |
ca2163eb | 4292 | |
c4464ade | 4293 | static bool |
ca2163eb | 4294 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4295 | { |
ca2163eb | 4296 | struct regcache *regcache; |
ca2163eb PA |
4297 | int syscall_number; |
4298 | ||
00431a78 | 4299 | context_switch (ecs); |
ca2163eb | 4300 | |
00431a78 | 4301 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4302 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4303 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4304 | |
a96d9b2e SDJ |
4305 | if (catch_syscall_enabled () > 0 |
4306 | && catching_syscall_number (syscall_number) > 0) | |
4307 | { | |
1eb8556f | 4308 | infrun_debug_printf ("syscall number=%d", syscall_number); |
a96d9b2e | 4309 | |
16c381f0 | 4310 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4311 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4312 | ecs->event_thread->suspend.stop_pc, |
4313 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4314 | |
c65d6b55 | 4315 | if (handle_stop_requested (ecs)) |
c4464ade | 4316 | return false; |
c65d6b55 | 4317 | |
ce12b012 | 4318 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4319 | { |
4320 | /* Catchpoint hit. */ | |
c4464ade | 4321 | return false; |
ca2163eb | 4322 | } |
a96d9b2e | 4323 | } |
ca2163eb | 4324 | |
c65d6b55 | 4325 | if (handle_stop_requested (ecs)) |
c4464ade | 4326 | return false; |
c65d6b55 | 4327 | |
ca2163eb | 4328 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb | 4329 | keep_going (ecs); |
c4464ade SM |
4330 | |
4331 | return true; | |
a96d9b2e SDJ |
4332 | } |
4333 | ||
7e324e48 GB |
4334 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4335 | ||
4336 | static void | |
4337 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4338 | struct execution_control_state *ecs) | |
4339 | { | |
4340 | if (!ecs->stop_func_filled_in) | |
4341 | { | |
98a617f8 | 4342 | const block *block; |
fe830662 | 4343 | const general_symbol_info *gsi; |
98a617f8 | 4344 | |
7e324e48 GB |
4345 | /* Don't care about return value; stop_func_start and stop_func_name |
4346 | will both be 0 if it doesn't work. */ | |
fe830662 TT |
4347 | find_pc_partial_function_sym (ecs->event_thread->suspend.stop_pc, |
4348 | &gsi, | |
4349 | &ecs->stop_func_start, | |
4350 | &ecs->stop_func_end, | |
4351 | &block); | |
4352 | ecs->stop_func_name = gsi == nullptr ? nullptr : gsi->print_name (); | |
98a617f8 KB |
4353 | |
4354 | /* The call to find_pc_partial_function, above, will set | |
4355 | stop_func_start and stop_func_end to the start and end | |
4356 | of the range containing the stop pc. If this range | |
4357 | contains the entry pc for the block (which is always the | |
4358 | case for contiguous blocks), advance stop_func_start past | |
4359 | the function's start offset and entrypoint. Note that | |
4360 | stop_func_start is NOT advanced when in a range of a | |
4361 | non-contiguous block that does not contain the entry pc. */ | |
4362 | if (block != nullptr | |
4363 | && ecs->stop_func_start <= BLOCK_ENTRY_PC (block) | |
4364 | && BLOCK_ENTRY_PC (block) < ecs->stop_func_end) | |
4365 | { | |
4366 | ecs->stop_func_start | |
4367 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4368 | ||
4369 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4370 | ecs->stop_func_start | |
4371 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4372 | } | |
591a12a1 | 4373 | |
7e324e48 GB |
4374 | ecs->stop_func_filled_in = 1; |
4375 | } | |
4376 | } | |
4377 | ||
4f5d7f63 | 4378 | |
00431a78 | 4379 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4380 | |
4381 | static enum stop_kind | |
00431a78 | 4382 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4383 | { |
5b6d1e4f | 4384 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4385 | |
4386 | gdb_assert (inf != NULL); | |
4387 | return inf->control.stop_soon; | |
4388 | } | |
4389 | ||
5b6d1e4f PA |
4390 | /* Poll for one event out of the current target. Store the resulting |
4391 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4392 | |
4393 | static ptid_t | |
5b6d1e4f | 4394 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4395 | { |
4396 | ptid_t event_ptid; | |
372316f1 PA |
4397 | |
4398 | overlay_cache_invalid = 1; | |
4399 | ||
4400 | /* Flush target cache before starting to handle each event. | |
4401 | Target was running and cache could be stale. This is just a | |
4402 | heuristic. Running threads may modify target memory, but we | |
4403 | don't get any event. */ | |
4404 | target_dcache_invalidate (); | |
4405 | ||
4406 | if (deprecated_target_wait_hook) | |
5b6d1e4f | 4407 | event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 | 4408 | else |
5b6d1e4f | 4409 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4410 | |
4411 | if (debug_infrun) | |
5b6d1e4f | 4412 | print_target_wait_results (minus_one_ptid, event_ptid, ws); |
372316f1 PA |
4413 | |
4414 | return event_ptid; | |
4415 | } | |
4416 | ||
5b6d1e4f PA |
4417 | /* Wait for one event out of any target. */ |
4418 | ||
4419 | static wait_one_event | |
4420 | wait_one () | |
4421 | { | |
4422 | while (1) | |
4423 | { | |
4424 | for (inferior *inf : all_inferiors ()) | |
4425 | { | |
4426 | process_stratum_target *target = inf->process_target (); | |
4427 | if (target == NULL | |
4428 | || !target->is_async_p () | |
4429 | || !target->threads_executing) | |
4430 | continue; | |
4431 | ||
4432 | switch_to_inferior_no_thread (inf); | |
4433 | ||
4434 | wait_one_event event; | |
4435 | event.target = target; | |
4436 | event.ptid = poll_one_curr_target (&event.ws); | |
4437 | ||
4438 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4439 | { | |
4440 | /* If nothing is resumed, remove the target from the | |
4441 | event loop. */ | |
4442 | target_async (0); | |
4443 | } | |
4444 | else if (event.ws.kind != TARGET_WAITKIND_IGNORE) | |
4445 | return event; | |
4446 | } | |
4447 | ||
4448 | /* Block waiting for some event. */ | |
4449 | ||
4450 | fd_set readfds; | |
4451 | int nfds = 0; | |
4452 | ||
4453 | FD_ZERO (&readfds); | |
4454 | ||
4455 | for (inferior *inf : all_inferiors ()) | |
4456 | { | |
4457 | process_stratum_target *target = inf->process_target (); | |
4458 | if (target == NULL | |
4459 | || !target->is_async_p () | |
4460 | || !target->threads_executing) | |
4461 | continue; | |
4462 | ||
4463 | int fd = target->async_wait_fd (); | |
4464 | FD_SET (fd, &readfds); | |
4465 | if (nfds <= fd) | |
4466 | nfds = fd + 1; | |
4467 | } | |
4468 | ||
4469 | if (nfds == 0) | |
4470 | { | |
4471 | /* No waitable targets left. All must be stopped. */ | |
4472 | return {NULL, minus_one_ptid, {TARGET_WAITKIND_NO_RESUMED}}; | |
4473 | } | |
4474 | ||
4475 | QUIT; | |
4476 | ||
4477 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4478 | if (numfds < 0) | |
4479 | { | |
4480 | if (errno == EINTR) | |
4481 | continue; | |
4482 | else | |
4483 | perror_with_name ("interruptible_select"); | |
4484 | } | |
4485 | } | |
4486 | } | |
4487 | ||
372316f1 PA |
4488 | /* Save the thread's event and stop reason to process it later. */ |
4489 | ||
4490 | static void | |
5b6d1e4f | 4491 | save_waitstatus (struct thread_info *tp, const target_waitstatus *ws) |
372316f1 | 4492 | { |
1eb8556f SM |
4493 | infrun_debug_printf ("saving status %s for %d.%ld.%ld", |
4494 | target_waitstatus_to_string (ws).c_str (), | |
4495 | tp->ptid.pid (), | |
4496 | tp->ptid.lwp (), | |
4497 | tp->ptid.tid ()); | |
372316f1 PA |
4498 | |
4499 | /* Record for later. */ | |
4500 | tp->suspend.waitstatus = *ws; | |
4501 | tp->suspend.waitstatus_pending_p = 1; | |
4502 | ||
00431a78 | 4503 | struct regcache *regcache = get_thread_regcache (tp); |
8b86c959 | 4504 | const address_space *aspace = regcache->aspace (); |
372316f1 PA |
4505 | |
4506 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4507 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4508 | { | |
4509 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4510 | ||
4511 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4512 | ||
18493a00 PA |
4513 | scoped_restore_current_thread restore_thread; |
4514 | switch_to_thread (tp); | |
4515 | ||
4516 | if (target_stopped_by_watchpoint ()) | |
372316f1 PA |
4517 | { |
4518 | tp->suspend.stop_reason | |
4519 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4520 | } | |
4521 | else if (target_supports_stopped_by_sw_breakpoint () | |
18493a00 | 4522 | && target_stopped_by_sw_breakpoint ()) |
372316f1 PA |
4523 | { |
4524 | tp->suspend.stop_reason | |
4525 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4526 | } | |
4527 | else if (target_supports_stopped_by_hw_breakpoint () | |
18493a00 | 4528 | && target_stopped_by_hw_breakpoint ()) |
372316f1 PA |
4529 | { |
4530 | tp->suspend.stop_reason | |
4531 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4532 | } | |
4533 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4534 | && hardware_breakpoint_inserted_here_p (aspace, | |
4535 | pc)) | |
4536 | { | |
4537 | tp->suspend.stop_reason | |
4538 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4539 | } | |
4540 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4541 | && software_breakpoint_inserted_here_p (aspace, | |
4542 | pc)) | |
4543 | { | |
4544 | tp->suspend.stop_reason | |
4545 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4546 | } | |
4547 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4548 | && currently_stepping (tp)) | |
4549 | { | |
4550 | tp->suspend.stop_reason | |
4551 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4552 | } | |
4553 | } | |
4554 | } | |
4555 | ||
293b3ebc TBA |
4556 | /* Mark the non-executing threads accordingly. In all-stop, all |
4557 | threads of all processes are stopped when we get any event | |
4558 | reported. In non-stop mode, only the event thread stops. */ | |
4559 | ||
4560 | static void | |
4561 | mark_non_executing_threads (process_stratum_target *target, | |
4562 | ptid_t event_ptid, | |
4563 | struct target_waitstatus ws) | |
4564 | { | |
4565 | ptid_t mark_ptid; | |
4566 | ||
4567 | if (!target_is_non_stop_p ()) | |
4568 | mark_ptid = minus_one_ptid; | |
4569 | else if (ws.kind == TARGET_WAITKIND_SIGNALLED | |
4570 | || ws.kind == TARGET_WAITKIND_EXITED) | |
4571 | { | |
4572 | /* If we're handling a process exit in non-stop mode, even | |
4573 | though threads haven't been deleted yet, one would think | |
4574 | that there is nothing to do, as threads of the dead process | |
4575 | will be soon deleted, and threads of any other process were | |
4576 | left running. However, on some targets, threads survive a | |
4577 | process exit event. E.g., for the "checkpoint" command, | |
4578 | when the current checkpoint/fork exits, linux-fork.c | |
4579 | automatically switches to another fork from within | |
4580 | target_mourn_inferior, by associating the same | |
4581 | inferior/thread to another fork. We haven't mourned yet at | |
4582 | this point, but we must mark any threads left in the | |
4583 | process as not-executing so that finish_thread_state marks | |
4584 | them stopped (in the user's perspective) if/when we present | |
4585 | the stop to the user. */ | |
4586 | mark_ptid = ptid_t (event_ptid.pid ()); | |
4587 | } | |
4588 | else | |
4589 | mark_ptid = event_ptid; | |
4590 | ||
4591 | set_executing (target, mark_ptid, false); | |
4592 | ||
4593 | /* Likewise the resumed flag. */ | |
4594 | set_resumed (target, mark_ptid, false); | |
4595 | } | |
4596 | ||
d758e62c PA |
4597 | /* Handle one event after stopping threads. If the eventing thread |
4598 | reports back any interesting event, we leave it pending. If the | |
4599 | eventing thread was in the middle of a displaced step, we | |
8ff53139 PA |
4600 | cancel/finish it, and unless the thread's inferior is being |
4601 | detached, put the thread back in the step-over chain. Returns true | |
4602 | if there are no resumed threads left in the target (thus there's no | |
4603 | point in waiting further), false otherwise. */ | |
d758e62c PA |
4604 | |
4605 | static bool | |
4606 | handle_one (const wait_one_event &event) | |
4607 | { | |
4608 | infrun_debug_printf | |
4609 | ("%s %s", target_waitstatus_to_string (&event.ws).c_str (), | |
4610 | target_pid_to_str (event.ptid).c_str ()); | |
4611 | ||
4612 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4613 | { | |
4614 | /* All resumed threads exited. */ | |
4615 | return true; | |
4616 | } | |
4617 | else if (event.ws.kind == TARGET_WAITKIND_THREAD_EXITED | |
4618 | || event.ws.kind == TARGET_WAITKIND_EXITED | |
4619 | || event.ws.kind == TARGET_WAITKIND_SIGNALLED) | |
4620 | { | |
4621 | /* One thread/process exited/signalled. */ | |
4622 | ||
4623 | thread_info *t = nullptr; | |
4624 | ||
4625 | /* The target may have reported just a pid. If so, try | |
4626 | the first non-exited thread. */ | |
4627 | if (event.ptid.is_pid ()) | |
4628 | { | |
4629 | int pid = event.ptid.pid (); | |
4630 | inferior *inf = find_inferior_pid (event.target, pid); | |
4631 | for (thread_info *tp : inf->non_exited_threads ()) | |
4632 | { | |
4633 | t = tp; | |
4634 | break; | |
4635 | } | |
4636 | ||
4637 | /* If there is no available thread, the event would | |
4638 | have to be appended to a per-inferior event list, | |
4639 | which does not exist (and if it did, we'd have | |
4640 | to adjust run control command to be able to | |
4641 | resume such an inferior). We assert here instead | |
4642 | of going into an infinite loop. */ | |
4643 | gdb_assert (t != nullptr); | |
4644 | ||
4645 | infrun_debug_printf | |
4646 | ("using %s", target_pid_to_str (t->ptid).c_str ()); | |
4647 | } | |
4648 | else | |
4649 | { | |
4650 | t = find_thread_ptid (event.target, event.ptid); | |
4651 | /* Check if this is the first time we see this thread. | |
4652 | Don't bother adding if it individually exited. */ | |
4653 | if (t == nullptr | |
4654 | && event.ws.kind != TARGET_WAITKIND_THREAD_EXITED) | |
4655 | t = add_thread (event.target, event.ptid); | |
4656 | } | |
4657 | ||
4658 | if (t != nullptr) | |
4659 | { | |
4660 | /* Set the threads as non-executing to avoid | |
4661 | another stop attempt on them. */ | |
4662 | switch_to_thread_no_regs (t); | |
4663 | mark_non_executing_threads (event.target, event.ptid, | |
4664 | event.ws); | |
4665 | save_waitstatus (t, &event.ws); | |
4666 | t->stop_requested = false; | |
4667 | } | |
4668 | } | |
4669 | else | |
4670 | { | |
4671 | thread_info *t = find_thread_ptid (event.target, event.ptid); | |
4672 | if (t == NULL) | |
4673 | t = add_thread (event.target, event.ptid); | |
4674 | ||
4675 | t->stop_requested = 0; | |
4676 | t->executing = 0; | |
4677 | t->resumed = false; | |
4678 | t->control.may_range_step = 0; | |
4679 | ||
4680 | /* This may be the first time we see the inferior report | |
4681 | a stop. */ | |
4682 | inferior *inf = find_inferior_ptid (event.target, event.ptid); | |
4683 | if (inf->needs_setup) | |
4684 | { | |
4685 | switch_to_thread_no_regs (t); | |
4686 | setup_inferior (0); | |
4687 | } | |
4688 | ||
4689 | if (event.ws.kind == TARGET_WAITKIND_STOPPED | |
4690 | && event.ws.value.sig == GDB_SIGNAL_0) | |
4691 | { | |
4692 | /* We caught the event that we intended to catch, so | |
4693 | there's no event pending. */ | |
4694 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4695 | t->suspend.waitstatus_pending_p = 0; | |
4696 | ||
4697 | if (displaced_step_finish (t, GDB_SIGNAL_0) | |
4698 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) | |
4699 | { | |
4700 | /* Add it back to the step-over queue. */ | |
4701 | infrun_debug_printf | |
4702 | ("displaced-step of %s canceled", | |
4703 | target_pid_to_str (t->ptid).c_str ()); | |
4704 | ||
4705 | t->control.trap_expected = 0; | |
8ff53139 PA |
4706 | if (!t->inf->detaching) |
4707 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
4708 | } |
4709 | } | |
4710 | else | |
4711 | { | |
4712 | enum gdb_signal sig; | |
4713 | struct regcache *regcache; | |
4714 | ||
4715 | infrun_debug_printf | |
4716 | ("target_wait %s, saving status for %d.%ld.%ld", | |
4717 | target_waitstatus_to_string (&event.ws).c_str (), | |
4718 | t->ptid.pid (), t->ptid.lwp (), t->ptid.tid ()); | |
4719 | ||
4720 | /* Record for later. */ | |
4721 | save_waitstatus (t, &event.ws); | |
4722 | ||
4723 | sig = (event.ws.kind == TARGET_WAITKIND_STOPPED | |
4724 | ? event.ws.value.sig : GDB_SIGNAL_0); | |
4725 | ||
4726 | if (displaced_step_finish (t, sig) | |
4727 | == DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED) | |
4728 | { | |
4729 | /* Add it back to the step-over queue. */ | |
4730 | t->control.trap_expected = 0; | |
8ff53139 PA |
4731 | if (!t->inf->detaching) |
4732 | global_thread_step_over_chain_enqueue (t); | |
d758e62c PA |
4733 | } |
4734 | ||
4735 | regcache = get_thread_regcache (t); | |
4736 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4737 | ||
4738 | infrun_debug_printf ("saved stop_pc=%s for %s " | |
4739 | "(currently_stepping=%d)", | |
4740 | paddress (target_gdbarch (), | |
4741 | t->suspend.stop_pc), | |
4742 | target_pid_to_str (t->ptid).c_str (), | |
4743 | currently_stepping (t)); | |
4744 | } | |
4745 | } | |
4746 | ||
4747 | return false; | |
4748 | } | |
4749 | ||
6efcd9a8 | 4750 | /* See infrun.h. */ |
372316f1 | 4751 | |
6efcd9a8 | 4752 | void |
372316f1 PA |
4753 | stop_all_threads (void) |
4754 | { | |
4755 | /* We may need multiple passes to discover all threads. */ | |
4756 | int pass; | |
4757 | int iterations = 0; | |
372316f1 | 4758 | |
53cccef1 | 4759 | gdb_assert (exists_non_stop_target ()); |
372316f1 | 4760 | |
1eb8556f | 4761 | infrun_debug_printf ("starting"); |
372316f1 | 4762 | |
00431a78 | 4763 | scoped_restore_current_thread restore_thread; |
372316f1 | 4764 | |
6ad82919 TBA |
4765 | /* Enable thread events of all targets. */ |
4766 | for (auto *target : all_non_exited_process_targets ()) | |
4767 | { | |
4768 | switch_to_target_no_thread (target); | |
4769 | target_thread_events (true); | |
4770 | } | |
4771 | ||
4772 | SCOPE_EXIT | |
4773 | { | |
4774 | /* Disable thread events of all targets. */ | |
4775 | for (auto *target : all_non_exited_process_targets ()) | |
4776 | { | |
4777 | switch_to_target_no_thread (target); | |
4778 | target_thread_events (false); | |
4779 | } | |
4780 | ||
17417fb0 | 4781 | /* Use debug_prefixed_printf directly to get a meaningful function |
dda83cd7 | 4782 | name. */ |
6ad82919 | 4783 | if (debug_infrun) |
17417fb0 | 4784 | debug_prefixed_printf ("infrun", "stop_all_threads", "done"); |
6ad82919 | 4785 | }; |
65706a29 | 4786 | |
372316f1 PA |
4787 | /* Request threads to stop, and then wait for the stops. Because |
4788 | threads we already know about can spawn more threads while we're | |
4789 | trying to stop them, and we only learn about new threads when we | |
4790 | update the thread list, do this in a loop, and keep iterating | |
4791 | until two passes find no threads that need to be stopped. */ | |
4792 | for (pass = 0; pass < 2; pass++, iterations++) | |
4793 | { | |
1eb8556f | 4794 | infrun_debug_printf ("pass=%d, iterations=%d", pass, iterations); |
372316f1 PA |
4795 | while (1) |
4796 | { | |
29d6859f | 4797 | int waits_needed = 0; |
372316f1 | 4798 | |
a05575d3 TBA |
4799 | for (auto *target : all_non_exited_process_targets ()) |
4800 | { | |
4801 | switch_to_target_no_thread (target); | |
4802 | update_thread_list (); | |
4803 | } | |
372316f1 PA |
4804 | |
4805 | /* Go through all threads looking for threads that we need | |
4806 | to tell the target to stop. */ | |
08036331 | 4807 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 4808 | { |
53cccef1 TBA |
4809 | /* For a single-target setting with an all-stop target, |
4810 | we would not even arrive here. For a multi-target | |
4811 | setting, until GDB is able to handle a mixture of | |
4812 | all-stop and non-stop targets, simply skip all-stop | |
4813 | targets' threads. This should be fine due to the | |
4814 | protection of 'check_multi_target_resumption'. */ | |
4815 | ||
4816 | switch_to_thread_no_regs (t); | |
4817 | if (!target_is_non_stop_p ()) | |
4818 | continue; | |
4819 | ||
372316f1 PA |
4820 | if (t->executing) |
4821 | { | |
4822 | /* If already stopping, don't request a stop again. | |
4823 | We just haven't seen the notification yet. */ | |
4824 | if (!t->stop_requested) | |
4825 | { | |
1eb8556f SM |
4826 | infrun_debug_printf (" %s executing, need stop", |
4827 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4828 | target_stop (t->ptid); |
4829 | t->stop_requested = 1; | |
4830 | } | |
4831 | else | |
4832 | { | |
1eb8556f SM |
4833 | infrun_debug_printf (" %s executing, already stopping", |
4834 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4835 | } |
4836 | ||
4837 | if (t->stop_requested) | |
29d6859f | 4838 | waits_needed++; |
372316f1 PA |
4839 | } |
4840 | else | |
4841 | { | |
1eb8556f SM |
4842 | infrun_debug_printf (" %s not executing", |
4843 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4844 | |
4845 | /* The thread may be not executing, but still be | |
4846 | resumed with a pending status to process. */ | |
719546c4 | 4847 | t->resumed = false; |
372316f1 PA |
4848 | } |
4849 | } | |
4850 | ||
29d6859f | 4851 | if (waits_needed == 0) |
372316f1 PA |
4852 | break; |
4853 | ||
4854 | /* If we find new threads on the second iteration, restart | |
4855 | over. We want to see two iterations in a row with all | |
4856 | threads stopped. */ | |
4857 | if (pass > 0) | |
4858 | pass = -1; | |
4859 | ||
29d6859f | 4860 | for (int i = 0; i < waits_needed; i++) |
c29705b7 | 4861 | { |
29d6859f | 4862 | wait_one_event event = wait_one (); |
d758e62c PA |
4863 | if (handle_one (event)) |
4864 | break; | |
372316f1 PA |
4865 | } |
4866 | } | |
4867 | } | |
372316f1 PA |
4868 | } |
4869 | ||
f4836ba9 PA |
4870 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4871 | ||
c4464ade | 4872 | static bool |
f4836ba9 PA |
4873 | handle_no_resumed (struct execution_control_state *ecs) |
4874 | { | |
3b12939d | 4875 | if (target_can_async_p ()) |
f4836ba9 | 4876 | { |
c4464ade | 4877 | bool any_sync = false; |
f4836ba9 | 4878 | |
2dab0c7b | 4879 | for (ui *ui : all_uis ()) |
3b12939d PA |
4880 | { |
4881 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4882 | { | |
c4464ade | 4883 | any_sync = true; |
3b12939d PA |
4884 | break; |
4885 | } | |
4886 | } | |
4887 | if (!any_sync) | |
4888 | { | |
4889 | /* There were no unwaited-for children left in the target, but, | |
4890 | we're not synchronously waiting for events either. Just | |
4891 | ignore. */ | |
4892 | ||
1eb8556f | 4893 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)"); |
3b12939d | 4894 | prepare_to_wait (ecs); |
c4464ade | 4895 | return true; |
3b12939d | 4896 | } |
f4836ba9 PA |
4897 | } |
4898 | ||
4899 | /* Otherwise, if we were running a synchronous execution command, we | |
4900 | may need to cancel it and give the user back the terminal. | |
4901 | ||
4902 | In non-stop mode, the target can't tell whether we've already | |
4903 | consumed previous stop events, so it can end up sending us a | |
4904 | no-resumed event like so: | |
4905 | ||
4906 | #0 - thread 1 is left stopped | |
4907 | ||
4908 | #1 - thread 2 is resumed and hits breakpoint | |
dda83cd7 | 4909 | -> TARGET_WAITKIND_STOPPED |
f4836ba9 PA |
4910 | |
4911 | #2 - thread 3 is resumed and exits | |
dda83cd7 | 4912 | this is the last resumed thread, so |
f4836ba9 PA |
4913 | -> TARGET_WAITKIND_NO_RESUMED |
4914 | ||
4915 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
dda83cd7 | 4916 | it. |
f4836ba9 PA |
4917 | |
4918 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
dda83cd7 | 4919 | thread 2 is now resumed, so the event should be ignored. |
f4836ba9 PA |
4920 | |
4921 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4922 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4923 | event. But it could be that the event meant that thread 2 itself | |
4924 | (or whatever other thread was the last resumed thread) exited. | |
4925 | ||
4926 | To address this we refresh the thread list and check whether we | |
4927 | have resumed threads _now_. In the example above, this removes | |
4928 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4929 | ignore this event. If we find no thread resumed, then we cancel | |
7d3badc6 PA |
4930 | the synchronous command and show "no unwaited-for " to the |
4931 | user. */ | |
f4836ba9 | 4932 | |
d6cc5d98 | 4933 | inferior *curr_inf = current_inferior (); |
7d3badc6 | 4934 | |
d6cc5d98 PA |
4935 | scoped_restore_current_thread restore_thread; |
4936 | ||
4937 | for (auto *target : all_non_exited_process_targets ()) | |
4938 | { | |
4939 | switch_to_target_no_thread (target); | |
4940 | update_thread_list (); | |
4941 | } | |
4942 | ||
4943 | /* If: | |
4944 | ||
4945 | - the current target has no thread executing, and | |
4946 | - the current inferior is native, and | |
4947 | - the current inferior is the one which has the terminal, and | |
4948 | - we did nothing, | |
4949 | ||
4950 | then a Ctrl-C from this point on would remain stuck in the | |
4951 | kernel, until a thread resumes and dequeues it. That would | |
4952 | result in the GDB CLI not reacting to Ctrl-C, not able to | |
4953 | interrupt the program. To address this, if the current inferior | |
4954 | no longer has any thread executing, we give the terminal to some | |
4955 | other inferior that has at least one thread executing. */ | |
4956 | bool swap_terminal = true; | |
4957 | ||
4958 | /* Whether to ignore this TARGET_WAITKIND_NO_RESUMED event, or | |
4959 | whether to report it to the user. */ | |
4960 | bool ignore_event = false; | |
7d3badc6 PA |
4961 | |
4962 | for (thread_info *thread : all_non_exited_threads ()) | |
f4836ba9 | 4963 | { |
d6cc5d98 PA |
4964 | if (swap_terminal && thread->executing) |
4965 | { | |
4966 | if (thread->inf != curr_inf) | |
4967 | { | |
4968 | target_terminal::ours (); | |
4969 | ||
4970 | switch_to_thread (thread); | |
4971 | target_terminal::inferior (); | |
4972 | } | |
4973 | swap_terminal = false; | |
4974 | } | |
4975 | ||
4976 | if (!ignore_event | |
4977 | && (thread->executing | |
4978 | || thread->suspend.waitstatus_pending_p)) | |
f4836ba9 | 4979 | { |
7d3badc6 PA |
4980 | /* Either there were no unwaited-for children left in the |
4981 | target at some point, but there are now, or some target | |
4982 | other than the eventing one has unwaited-for children | |
4983 | left. Just ignore. */ | |
1eb8556f SM |
4984 | infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED " |
4985 | "(ignoring: found resumed)"); | |
d6cc5d98 PA |
4986 | |
4987 | ignore_event = true; | |
f4836ba9 | 4988 | } |
d6cc5d98 PA |
4989 | |
4990 | if (ignore_event && !swap_terminal) | |
4991 | break; | |
4992 | } | |
4993 | ||
4994 | if (ignore_event) | |
4995 | { | |
4996 | switch_to_inferior_no_thread (curr_inf); | |
4997 | prepare_to_wait (ecs); | |
c4464ade | 4998 | return true; |
f4836ba9 PA |
4999 | } |
5000 | ||
5001 | /* Go ahead and report the event. */ | |
c4464ade | 5002 | return false; |
f4836ba9 PA |
5003 | } |
5004 | ||
05ba8510 PA |
5005 | /* Given an execution control state that has been freshly filled in by |
5006 | an event from the inferior, figure out what it means and take | |
5007 | appropriate action. | |
5008 | ||
5009 | The alternatives are: | |
5010 | ||
22bcd14b | 5011 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5012 | debugger. |
5013 | ||
5014 | 2) keep_going and return; to wait for the next event (set | |
5015 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5016 | once). */ | |
c906108c | 5017 | |
ec9499be | 5018 | static void |
595915c1 | 5019 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5020 | { |
595915c1 TT |
5021 | /* Make sure that all temporary struct value objects that were |
5022 | created during the handling of the event get deleted at the | |
5023 | end. */ | |
5024 | scoped_value_mark free_values; | |
5025 | ||
d6b48e9c PA |
5026 | enum stop_kind stop_soon; |
5027 | ||
1eb8556f | 5028 | infrun_debug_printf ("%s", target_waitstatus_to_string (&ecs->ws).c_str ()); |
c29705b7 | 5029 | |
28736962 PA |
5030 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
5031 | { | |
5032 | /* We had an event in the inferior, but we are not interested in | |
5033 | handling it at this level. The lower layers have already | |
5034 | done what needs to be done, if anything. | |
5035 | ||
5036 | One of the possible circumstances for this is when the | |
5037 | inferior produces output for the console. The inferior has | |
5038 | not stopped, and we are ignoring the event. Another possible | |
5039 | circumstance is any event which the lower level knows will be | |
5040 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5041 | prepare_to_wait (ecs); |
5042 | return; | |
5043 | } | |
5044 | ||
65706a29 PA |
5045 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
5046 | { | |
65706a29 PA |
5047 | prepare_to_wait (ecs); |
5048 | return; | |
5049 | } | |
5050 | ||
0e5bf2a8 | 5051 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5052 | && handle_no_resumed (ecs)) |
5053 | return; | |
0e5bf2a8 | 5054 | |
5b6d1e4f PA |
5055 | /* Cache the last target/ptid/waitstatus. */ |
5056 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5057 | |
ca005067 | 5058 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5059 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5060 | |
0e5bf2a8 PA |
5061 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
5062 | { | |
5063 | /* No unwaited-for children left. IOW, all resumed children | |
5064 | have exited. */ | |
c4464ade | 5065 | stop_print_frame = false; |
22bcd14b | 5066 | stop_waiting (ecs); |
0e5bf2a8 PA |
5067 | return; |
5068 | } | |
5069 | ||
8c90c137 | 5070 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 5071 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 | 5072 | { |
5b6d1e4f | 5073 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5074 | /* If it's a new thread, add it to the thread database. */ |
5075 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5076 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5077 | |
5078 | /* Disable range stepping. If the next step request could use a | |
5079 | range, this will be end up re-enabled then. */ | |
5080 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5081 | } |
88ed393a JK |
5082 | |
5083 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 5084 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
5085 | |
5086 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5087 | reinit_frame_cache (); | |
5088 | ||
28736962 PA |
5089 | breakpoint_retire_moribund (); |
5090 | ||
2b009048 DJ |
5091 | /* First, distinguish signals caused by the debugger from signals |
5092 | that have to do with the program's own actions. Note that | |
5093 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5094 | on the operating system version. Here we detect when a SIGILL or | |
5095 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5096 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5097 | when we're trying to execute a breakpoint instruction on a | |
5098 | non-executable stack. This happens for call dummy breakpoints | |
5099 | for architectures like SPARC that place call dummies on the | |
5100 | stack. */ | |
2b009048 | 5101 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
5102 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
5103 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
5104 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 5105 | { |
00431a78 | 5106 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5107 | |
a01bda52 | 5108 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5109 | regcache_read_pc (regcache))) |
5110 | { | |
1eb8556f | 5111 | infrun_debug_printf ("Treating signal as SIGTRAP"); |
a493e3e2 | 5112 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 5113 | } |
2b009048 DJ |
5114 | } |
5115 | ||
293b3ebc | 5116 | mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws); |
8c90c137 | 5117 | |
488f131b JB |
5118 | switch (ecs->ws.kind) |
5119 | { | |
5120 | case TARGET_WAITKIND_LOADED: | |
00431a78 | 5121 | context_switch (ecs); |
b0f4b84b | 5122 | /* Ignore gracefully during startup of the inferior, as it might |
dda83cd7 SM |
5123 | be the shell which has just loaded some objects, otherwise |
5124 | add the symbols for the newly loaded objects. Also ignore at | |
5125 | the beginning of an attach or remote session; we will query | |
5126 | the full list of libraries once the connection is | |
5127 | established. */ | |
4f5d7f63 | 5128 | |
00431a78 | 5129 | stop_soon = get_inferior_stop_soon (ecs); |
c0236d92 | 5130 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 5131 | { |
edcc5120 TT |
5132 | struct regcache *regcache; |
5133 | ||
00431a78 | 5134 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 TT |
5135 | |
5136 | handle_solib_event (); | |
5137 | ||
5138 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 5139 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
5140 | ecs->event_thread->suspend.stop_pc, |
5141 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 5142 | |
c65d6b55 PA |
5143 | if (handle_stop_requested (ecs)) |
5144 | return; | |
5145 | ||
ce12b012 | 5146 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
5147 | { |
5148 | /* A catchpoint triggered. */ | |
94c57d6a PA |
5149 | process_event_stop_test (ecs); |
5150 | return; | |
edcc5120 | 5151 | } |
488f131b | 5152 | |
b0f4b84b DJ |
5153 | /* If requested, stop when the dynamic linker notifies |
5154 | gdb of events. This allows the user to get control | |
5155 | and place breakpoints in initializer routines for | |
5156 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 5157 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
5158 | if (stop_on_solib_events) |
5159 | { | |
55409f9d DJ |
5160 | /* Make sure we print "Stopped due to solib-event" in |
5161 | normal_stop. */ | |
c4464ade | 5162 | stop_print_frame = true; |
55409f9d | 5163 | |
22bcd14b | 5164 | stop_waiting (ecs); |
b0f4b84b DJ |
5165 | return; |
5166 | } | |
488f131b | 5167 | } |
b0f4b84b DJ |
5168 | |
5169 | /* If we are skipping through a shell, or through shared library | |
5170 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 5171 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
5172 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
5173 | { | |
74960c60 VP |
5174 | /* Loading of shared libraries might have changed breakpoint |
5175 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 5176 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 5177 | insert_breakpoints (); |
64ce06e4 | 5178 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
5179 | prepare_to_wait (ecs); |
5180 | return; | |
5181 | } | |
5182 | ||
5c09a2c5 PA |
5183 | /* But stop if we're attaching or setting up a remote |
5184 | connection. */ | |
5185 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5186 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5187 | { | |
1eb8556f | 5188 | infrun_debug_printf ("quietly stopped"); |
22bcd14b | 5189 | stop_waiting (ecs); |
5c09a2c5 PA |
5190 | return; |
5191 | } | |
5192 | ||
5193 | internal_error (__FILE__, __LINE__, | |
5194 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 5195 | |
488f131b | 5196 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5197 | if (handle_stop_requested (ecs)) |
5198 | return; | |
00431a78 | 5199 | context_switch (ecs); |
64ce06e4 | 5200 | resume (GDB_SIGNAL_0); |
488f131b JB |
5201 | prepare_to_wait (ecs); |
5202 | return; | |
c5aa993b | 5203 | |
65706a29 | 5204 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5205 | if (handle_stop_requested (ecs)) |
5206 | return; | |
00431a78 | 5207 | context_switch (ecs); |
65706a29 PA |
5208 | if (!switch_back_to_stepped_thread (ecs)) |
5209 | keep_going (ecs); | |
5210 | return; | |
5211 | ||
488f131b | 5212 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5213 | case TARGET_WAITKIND_SIGNALLED: |
18493a00 PA |
5214 | { |
5215 | /* Depending on the system, ecs->ptid may point to a thread or | |
5216 | to a process. On some targets, target_mourn_inferior may | |
5217 | need to have access to the just-exited thread. That is the | |
5218 | case of GNU/Linux's "checkpoint" support, for example. | |
5219 | Call the switch_to_xxx routine as appropriate. */ | |
5220 | thread_info *thr = find_thread_ptid (ecs->target, ecs->ptid); | |
5221 | if (thr != nullptr) | |
5222 | switch_to_thread (thr); | |
5223 | else | |
5224 | { | |
5225 | inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); | |
5226 | switch_to_inferior_no_thread (inf); | |
5227 | } | |
5228 | } | |
6c95b8df | 5229 | handle_vfork_child_exec_or_exit (0); |
223ffa71 | 5230 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5231 | |
0c557179 SDJ |
5232 | /* Clearing any previous state of convenience variables. */ |
5233 | clear_exit_convenience_vars (); | |
5234 | ||
940c3c06 PA |
5235 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5236 | { | |
5237 | /* Record the exit code in the convenience variable $_exitcode, so | |
5238 | that the user can inspect this again later. */ | |
5239 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5240 | (LONGEST) ecs->ws.value.integer); | |
5241 | ||
5242 | /* Also record this in the inferior itself. */ | |
5243 | current_inferior ()->has_exit_code = 1; | |
5244 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5245 | |
98eb56a4 PA |
5246 | /* Support the --return-child-result option. */ |
5247 | return_child_result_value = ecs->ws.value.integer; | |
5248 | ||
76727919 | 5249 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
5250 | } |
5251 | else | |
0c557179 | 5252 | { |
00431a78 | 5253 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5254 | |
5255 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5256 | { | |
5257 | /* Set the value of the internal variable $_exitsignal, | |
5258 | which holds the signal uncaught by the inferior. */ | |
5259 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5260 | gdbarch_gdb_signal_to_target (gdbarch, | |
5261 | ecs->ws.value.sig)); | |
5262 | } | |
5263 | else | |
5264 | { | |
5265 | /* We don't have access to the target's method used for | |
5266 | converting between signal numbers (GDB's internal | |
5267 | representation <-> target's representation). | |
5268 | Therefore, we cannot do a good job at displaying this | |
5269 | information to the user. It's better to just warn | |
5270 | her about it (if infrun debugging is enabled), and | |
5271 | give up. */ | |
1eb8556f SM |
5272 | infrun_debug_printf ("Cannot fill $_exitsignal with the correct " |
5273 | "signal number."); | |
0c557179 SDJ |
5274 | } |
5275 | ||
76727919 | 5276 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 5277 | } |
8cf64490 | 5278 | |
488f131b | 5279 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5280 | target_mourn_inferior (inferior_ptid); |
c4464ade | 5281 | stop_print_frame = false; |
22bcd14b | 5282 | stop_waiting (ecs); |
488f131b | 5283 | return; |
c5aa993b | 5284 | |
488f131b | 5285 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5286 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5287 | /* Check whether the inferior is displaced stepping. */ |
5288 | { | |
00431a78 | 5289 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5290 | struct gdbarch *gdbarch = regcache->arch (); |
c0aba012 | 5291 | inferior *parent_inf = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 | 5292 | |
187b041e SM |
5293 | /* If this is a fork (child gets its own address space copy) and some |
5294 | displaced step buffers were in use at the time of the fork, restore | |
5295 | the displaced step buffer bytes in the child process. */ | |
c0aba012 | 5296 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) |
187b041e SM |
5297 | gdbarch_displaced_step_restore_all_in_ptid |
5298 | (gdbarch, parent_inf, ecs->ws.value.related_pid); | |
c0aba012 SM |
5299 | |
5300 | /* If displaced stepping is supported, and thread ecs->ptid is | |
5301 | displaced stepping. */ | |
00431a78 | 5302 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 | 5303 | { |
e2d96639 YQ |
5304 | struct regcache *child_regcache; |
5305 | CORE_ADDR parent_pc; | |
5306 | ||
5307 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
5308 | indicating that the displaced stepping of syscall instruction | |
5309 | has been done. Perform cleanup for parent process here. Note | |
5310 | that this operation also cleans up the child process for vfork, | |
5311 | because their pages are shared. */ | |
7def77a1 | 5312 | displaced_step_finish (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5313 | /* Start a new step-over in another thread if there's one |
5314 | that needs it. */ | |
5315 | start_step_over (); | |
e2d96639 | 5316 | |
e2d96639 YQ |
5317 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5318 | the child's PC is also within the scratchpad. Set the child's PC | |
5319 | to the parent's PC value, which has already been fixed up. | |
5320 | FIXME: we use the parent's aspace here, although we're touching | |
5321 | the child, because the child hasn't been added to the inferior | |
5322 | list yet at this point. */ | |
5323 | ||
5324 | child_regcache | |
5b6d1e4f PA |
5325 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
5326 | ecs->ws.value.related_pid, | |
e2d96639 YQ |
5327 | gdbarch, |
5328 | parent_inf->aspace); | |
5329 | /* Read PC value of parent process. */ | |
5330 | parent_pc = regcache_read_pc (regcache); | |
5331 | ||
136821d9 SM |
5332 | displaced_debug_printf ("write child pc from %s to %s", |
5333 | paddress (gdbarch, | |
5334 | regcache_read_pc (child_regcache)), | |
5335 | paddress (gdbarch, parent_pc)); | |
e2d96639 YQ |
5336 | |
5337 | regcache_write_pc (child_regcache, parent_pc); | |
5338 | } | |
5339 | } | |
5340 | ||
00431a78 | 5341 | context_switch (ecs); |
5a2901d9 | 5342 | |
b242c3c2 PA |
5343 | /* Immediately detach breakpoints from the child before there's |
5344 | any chance of letting the user delete breakpoints from the | |
5345 | breakpoint lists. If we don't do this early, it's easy to | |
5346 | leave left over traps in the child, vis: "break foo; catch | |
5347 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5348 | the fork on the last `continue', and by that time the | |
5349 | breakpoint at "foo" is long gone from the breakpoint table. | |
5350 | If we vforked, then we don't need to unpatch here, since both | |
5351 | parent and child are sharing the same memory pages; we'll | |
5352 | need to unpatch at follow/detach time instead to be certain | |
5353 | that new breakpoints added between catchpoint hit time and | |
5354 | vfork follow are detached. */ | |
5355 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5356 | { | |
b242c3c2 PA |
5357 | /* This won't actually modify the breakpoint list, but will |
5358 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5359 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5360 | } |
5361 | ||
34b7e8a6 | 5362 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5363 | |
e58b0e63 PA |
5364 | /* In case the event is caught by a catchpoint, remember that |
5365 | the event is to be followed at the next resume of the thread, | |
5366 | and not immediately. */ | |
5367 | ecs->event_thread->pending_follow = ecs->ws; | |
5368 | ||
f2ffa92b PA |
5369 | ecs->event_thread->suspend.stop_pc |
5370 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 5371 | |
16c381f0 | 5372 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5373 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5374 | ecs->event_thread->suspend.stop_pc, |
5375 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 5376 | |
c65d6b55 PA |
5377 | if (handle_stop_requested (ecs)) |
5378 | return; | |
5379 | ||
ce12b012 PA |
5380 | /* If no catchpoint triggered for this, then keep going. Note |
5381 | that we're interested in knowing the bpstat actually causes a | |
5382 | stop, not just if it may explain the signal. Software | |
5383 | watchpoints, for example, always appear in the bpstat. */ | |
5384 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5385 | { |
5ab2fbf1 | 5386 | bool follow_child |
3e43a32a | 5387 | = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 5388 | |
a493e3e2 | 5389 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 | 5390 | |
5b6d1e4f PA |
5391 | process_stratum_target *targ |
5392 | = ecs->event_thread->inf->process_target (); | |
5393 | ||
5ab2fbf1 | 5394 | bool should_resume = follow_fork (); |
e58b0e63 | 5395 | |
5b6d1e4f PA |
5396 | /* Note that one of these may be an invalid pointer, |
5397 | depending on detach_fork. */ | |
00431a78 | 5398 | thread_info *parent = ecs->event_thread; |
5b6d1e4f PA |
5399 | thread_info *child |
5400 | = find_thread_ptid (targ, ecs->ws.value.related_pid); | |
6c95b8df | 5401 | |
a2077e25 PA |
5402 | /* At this point, the parent is marked running, and the |
5403 | child is marked stopped. */ | |
5404 | ||
5405 | /* If not resuming the parent, mark it stopped. */ | |
5406 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5407 | parent->set_running (false); |
a2077e25 PA |
5408 | |
5409 | /* If resuming the child, mark it running. */ | |
5410 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5411 | child->set_running (true); |
a2077e25 | 5412 | |
6c95b8df | 5413 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5414 | if (!detach_fork && (non_stop |
5415 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5416 | { |
5417 | if (follow_child) | |
5418 | switch_to_thread (parent); | |
5419 | else | |
5420 | switch_to_thread (child); | |
5421 | ||
5422 | ecs->event_thread = inferior_thread (); | |
5423 | ecs->ptid = inferior_ptid; | |
5424 | keep_going (ecs); | |
5425 | } | |
5426 | ||
5427 | if (follow_child) | |
5428 | switch_to_thread (child); | |
5429 | else | |
5430 | switch_to_thread (parent); | |
5431 | ||
e58b0e63 PA |
5432 | ecs->event_thread = inferior_thread (); |
5433 | ecs->ptid = inferior_ptid; | |
5434 | ||
5435 | if (should_resume) | |
5436 | keep_going (ecs); | |
5437 | else | |
22bcd14b | 5438 | stop_waiting (ecs); |
04e68871 DJ |
5439 | return; |
5440 | } | |
94c57d6a PA |
5441 | process_event_stop_test (ecs); |
5442 | return; | |
488f131b | 5443 | |
6c95b8df PA |
5444 | case TARGET_WAITKIND_VFORK_DONE: |
5445 | /* Done with the shared memory region. Re-insert breakpoints in | |
5446 | the parent, and keep going. */ | |
5447 | ||
00431a78 | 5448 | context_switch (ecs); |
6c95b8df PA |
5449 | |
5450 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5451 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5452 | |
5453 | if (handle_stop_requested (ecs)) | |
5454 | return; | |
5455 | ||
6c95b8df PA |
5456 | /* This also takes care of reinserting breakpoints in the |
5457 | previously locked inferior. */ | |
5458 | keep_going (ecs); | |
5459 | return; | |
5460 | ||
488f131b | 5461 | case TARGET_WAITKIND_EXECD: |
488f131b | 5462 | |
cbd2b4e3 PA |
5463 | /* Note we can't read registers yet (the stop_pc), because we |
5464 | don't yet know the inferior's post-exec architecture. | |
5465 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5466 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5467 | |
6c95b8df PA |
5468 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5469 | handle_vfork_child_exec_or_exit (1); | |
5470 | ||
795e548f | 5471 | /* This causes the eventpoints and symbol table to be reset. |
dda83cd7 SM |
5472 | Must do this now, before trying to determine whether to |
5473 | stop. */ | |
71b43ef8 | 5474 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5475 | |
17d8546e DB |
5476 | /* In follow_exec we may have deleted the original thread and |
5477 | created a new one. Make sure that the event thread is the | |
5478 | execd thread for that case (this is a nop otherwise). */ | |
5479 | ecs->event_thread = inferior_thread (); | |
5480 | ||
f2ffa92b PA |
5481 | ecs->event_thread->suspend.stop_pc |
5482 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5483 | |
16c381f0 | 5484 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5485 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5486 | ecs->event_thread->suspend.stop_pc, |
5487 | ecs->event_thread, &ecs->ws); | |
795e548f | 5488 | |
71b43ef8 PA |
5489 | /* Note that this may be referenced from inside |
5490 | bpstat_stop_status above, through inferior_has_execd. */ | |
5491 | xfree (ecs->ws.value.execd_pathname); | |
5492 | ecs->ws.value.execd_pathname = NULL; | |
5493 | ||
c65d6b55 PA |
5494 | if (handle_stop_requested (ecs)) |
5495 | return; | |
5496 | ||
04e68871 | 5497 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5498 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5499 | { |
a493e3e2 | 5500 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5501 | keep_going (ecs); |
5502 | return; | |
5503 | } | |
94c57d6a PA |
5504 | process_event_stop_test (ecs); |
5505 | return; | |
488f131b | 5506 | |
b4dc5ffa | 5507 | /* Be careful not to try to gather much state about a thread |
dda83cd7 | 5508 | that's in a syscall. It's frequently a losing proposition. */ |
488f131b | 5509 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5510 | /* Getting the current syscall number. */ |
94c57d6a PA |
5511 | if (handle_syscall_event (ecs) == 0) |
5512 | process_event_stop_test (ecs); | |
5513 | return; | |
c906108c | 5514 | |
488f131b | 5515 | /* Before examining the threads further, step this thread to |
dda83cd7 SM |
5516 | get it entirely out of the syscall. (We get notice of the |
5517 | event when the thread is just on the verge of exiting a | |
5518 | syscall. Stepping one instruction seems to get it back | |
5519 | into user code.) */ | |
488f131b | 5520 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5521 | if (handle_syscall_event (ecs) == 0) |
5522 | process_event_stop_test (ecs); | |
5523 | return; | |
c906108c | 5524 | |
488f131b | 5525 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5526 | handle_signal_stop (ecs); |
5527 | return; | |
c906108c | 5528 | |
b2175913 MS |
5529 | case TARGET_WAITKIND_NO_HISTORY: |
5530 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5531 | |
d1988021 | 5532 | /* Switch to the stopped thread. */ |
00431a78 | 5533 | context_switch (ecs); |
1eb8556f | 5534 | infrun_debug_printf ("stopped"); |
d1988021 | 5535 | |
34b7e8a6 | 5536 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5537 | ecs->event_thread->suspend.stop_pc |
5538 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5539 | |
5540 | if (handle_stop_requested (ecs)) | |
5541 | return; | |
5542 | ||
76727919 | 5543 | gdb::observers::no_history.notify (); |
22bcd14b | 5544 | stop_waiting (ecs); |
b2175913 | 5545 | return; |
488f131b | 5546 | } |
4f5d7f63 PA |
5547 | } |
5548 | ||
372316f1 PA |
5549 | /* Restart threads back to what they were trying to do back when we |
5550 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5551 | ignored. */ | |
4d9d9d04 PA |
5552 | |
5553 | static void | |
372316f1 PA |
5554 | restart_threads (struct thread_info *event_thread) |
5555 | { | |
372316f1 PA |
5556 | /* In case the instruction just stepped spawned a new thread. */ |
5557 | update_thread_list (); | |
5558 | ||
08036331 | 5559 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5560 | { |
ac7d717c PA |
5561 | if (tp->inf->detaching) |
5562 | { | |
5563 | infrun_debug_printf ("restart threads: [%s] inferior detaching", | |
5564 | target_pid_to_str (tp->ptid).c_str ()); | |
5565 | continue; | |
5566 | } | |
5567 | ||
f3f8ece4 PA |
5568 | switch_to_thread_no_regs (tp); |
5569 | ||
372316f1 PA |
5570 | if (tp == event_thread) |
5571 | { | |
1eb8556f SM |
5572 | infrun_debug_printf ("restart threads: [%s] is event thread", |
5573 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5574 | continue; |
5575 | } | |
5576 | ||
5577 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5578 | { | |
1eb8556f SM |
5579 | infrun_debug_printf ("restart threads: [%s] not meant to be running", |
5580 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5581 | continue; |
5582 | } | |
5583 | ||
5584 | if (tp->resumed) | |
5585 | { | |
1eb8556f SM |
5586 | infrun_debug_printf ("restart threads: [%s] resumed", |
5587 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5588 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
5589 | continue; | |
5590 | } | |
5591 | ||
5592 | if (thread_is_in_step_over_chain (tp)) | |
5593 | { | |
1eb8556f SM |
5594 | infrun_debug_printf ("restart threads: [%s] needs step-over", |
5595 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5596 | gdb_assert (!tp->resumed); |
5597 | continue; | |
5598 | } | |
5599 | ||
5600 | ||
5601 | if (tp->suspend.waitstatus_pending_p) | |
5602 | { | |
1eb8556f SM |
5603 | infrun_debug_printf ("restart threads: [%s] has pending status", |
5604 | target_pid_to_str (tp->ptid).c_str ()); | |
719546c4 | 5605 | tp->resumed = true; |
372316f1 PA |
5606 | continue; |
5607 | } | |
5608 | ||
c65d6b55 PA |
5609 | gdb_assert (!tp->stop_requested); |
5610 | ||
372316f1 PA |
5611 | /* If some thread needs to start a step-over at this point, it |
5612 | should still be in the step-over queue, and thus skipped | |
5613 | above. */ | |
5614 | if (thread_still_needs_step_over (tp)) | |
5615 | { | |
5616 | internal_error (__FILE__, __LINE__, | |
5617 | "thread [%s] needs a step-over, but not in " | |
5618 | "step-over queue\n", | |
a068643d | 5619 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5620 | } |
5621 | ||
5622 | if (currently_stepping (tp)) | |
5623 | { | |
1eb8556f SM |
5624 | infrun_debug_printf ("restart threads: [%s] was stepping", |
5625 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5626 | keep_going_stepped_thread (tp); |
5627 | } | |
5628 | else | |
5629 | { | |
5630 | struct execution_control_state ecss; | |
5631 | struct execution_control_state *ecs = &ecss; | |
5632 | ||
1eb8556f SM |
5633 | infrun_debug_printf ("restart threads: [%s] continuing", |
5634 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 5635 | reset_ecs (ecs, tp); |
00431a78 | 5636 | switch_to_thread (tp); |
372316f1 PA |
5637 | keep_going_pass_signal (ecs); |
5638 | } | |
5639 | } | |
5640 | } | |
5641 | ||
5642 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5643 | a pending waitstatus. */ | |
5644 | ||
5645 | static int | |
5646 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5647 | void *arg) | |
5648 | { | |
5649 | return (tp->resumed | |
5650 | && tp->suspend.waitstatus_pending_p); | |
5651 | } | |
5652 | ||
5653 | /* Called when we get an event that may finish an in-line or | |
5654 | out-of-line (displaced stepping) step-over started previously. | |
5655 | Return true if the event is processed and we should go back to the | |
5656 | event loop; false if the caller should continue processing the | |
5657 | event. */ | |
5658 | ||
5659 | static int | |
4d9d9d04 PA |
5660 | finish_step_over (struct execution_control_state *ecs) |
5661 | { | |
7def77a1 SM |
5662 | displaced_step_finish (ecs->event_thread, |
5663 | ecs->event_thread->suspend.stop_signal); | |
4d9d9d04 | 5664 | |
c4464ade | 5665 | bool had_step_over_info = step_over_info_valid_p (); |
372316f1 PA |
5666 | |
5667 | if (had_step_over_info) | |
4d9d9d04 PA |
5668 | { |
5669 | /* If we're stepping over a breakpoint with all threads locked, | |
5670 | then only the thread that was stepped should be reporting | |
5671 | back an event. */ | |
5672 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5673 | ||
c65d6b55 | 5674 | clear_step_over_info (); |
4d9d9d04 PA |
5675 | } |
5676 | ||
fbea99ea | 5677 | if (!target_is_non_stop_p ()) |
372316f1 | 5678 | return 0; |
4d9d9d04 PA |
5679 | |
5680 | /* Start a new step-over in another thread if there's one that | |
5681 | needs it. */ | |
5682 | start_step_over (); | |
372316f1 PA |
5683 | |
5684 | /* If we were stepping over a breakpoint before, and haven't started | |
5685 | a new in-line step-over sequence, then restart all other threads | |
5686 | (except the event thread). We can't do this in all-stop, as then | |
5687 | e.g., we wouldn't be able to issue any other remote packet until | |
5688 | these other threads stop. */ | |
5689 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5690 | { | |
5691 | struct thread_info *pending; | |
5692 | ||
5693 | /* If we only have threads with pending statuses, the restart | |
5694 | below won't restart any thread and so nothing re-inserts the | |
5695 | breakpoint we just stepped over. But we need it inserted | |
5696 | when we later process the pending events, otherwise if | |
5697 | another thread has a pending event for this breakpoint too, | |
5698 | we'd discard its event (because the breakpoint that | |
5699 | originally caused the event was no longer inserted). */ | |
00431a78 | 5700 | context_switch (ecs); |
372316f1 PA |
5701 | insert_breakpoints (); |
5702 | ||
5703 | restart_threads (ecs->event_thread); | |
5704 | ||
5705 | /* If we have events pending, go through handle_inferior_event | |
5706 | again, picking up a pending event at random. This avoids | |
5707 | thread starvation. */ | |
5708 | ||
5709 | /* But not if we just stepped over a watchpoint in order to let | |
5710 | the instruction execute so we can evaluate its expression. | |
5711 | The set of watchpoints that triggered is recorded in the | |
5712 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5713 | If we processed another event first, that other event could | |
5714 | clobber this info. */ | |
5715 | if (ecs->event_thread->stepping_over_watchpoint) | |
5716 | return 0; | |
5717 | ||
5718 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5719 | NULL); | |
5720 | if (pending != NULL) | |
5721 | { | |
5722 | struct thread_info *tp = ecs->event_thread; | |
5723 | struct regcache *regcache; | |
5724 | ||
1eb8556f SM |
5725 | infrun_debug_printf ("found resumed threads with " |
5726 | "pending events, saving status"); | |
372316f1 PA |
5727 | |
5728 | gdb_assert (pending != tp); | |
5729 | ||
5730 | /* Record the event thread's event for later. */ | |
5731 | save_waitstatus (tp, &ecs->ws); | |
5732 | /* This was cleared early, by handle_inferior_event. Set it | |
5733 | so this pending event is considered by | |
5734 | do_target_wait. */ | |
719546c4 | 5735 | tp->resumed = true; |
372316f1 PA |
5736 | |
5737 | gdb_assert (!tp->executing); | |
5738 | ||
00431a78 | 5739 | regcache = get_thread_regcache (tp); |
372316f1 PA |
5740 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
5741 | ||
1eb8556f SM |
5742 | infrun_debug_printf ("saved stop_pc=%s for %s " |
5743 | "(currently_stepping=%d)", | |
5744 | paddress (target_gdbarch (), | |
dda83cd7 | 5745 | tp->suspend.stop_pc), |
1eb8556f SM |
5746 | target_pid_to_str (tp->ptid).c_str (), |
5747 | currently_stepping (tp)); | |
372316f1 PA |
5748 | |
5749 | /* This in-line step-over finished; clear this so we won't | |
5750 | start a new one. This is what handle_signal_stop would | |
5751 | do, if we returned false. */ | |
5752 | tp->stepping_over_breakpoint = 0; | |
5753 | ||
5754 | /* Wake up the event loop again. */ | |
5755 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5756 | ||
5757 | prepare_to_wait (ecs); | |
5758 | return 1; | |
5759 | } | |
5760 | } | |
5761 | ||
5762 | return 0; | |
4d9d9d04 PA |
5763 | } |
5764 | ||
4f5d7f63 PA |
5765 | /* Come here when the program has stopped with a signal. */ |
5766 | ||
5767 | static void | |
5768 | handle_signal_stop (struct execution_control_state *ecs) | |
5769 | { | |
5770 | struct frame_info *frame; | |
5771 | struct gdbarch *gdbarch; | |
5772 | int stopped_by_watchpoint; | |
5773 | enum stop_kind stop_soon; | |
5774 | int random_signal; | |
c906108c | 5775 | |
f0407826 DE |
5776 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5777 | ||
c65d6b55 PA |
5778 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5779 | ||
f0407826 DE |
5780 | /* Do we need to clean up the state of a thread that has |
5781 | completed a displaced single-step? (Doing so usually affects | |
5782 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5783 | if (finish_step_over (ecs)) |
5784 | return; | |
f0407826 DE |
5785 | |
5786 | /* If we either finished a single-step or hit a breakpoint, but | |
5787 | the user wanted this thread to be stopped, pretend we got a | |
5788 | SIG0 (generic unsignaled stop). */ | |
5789 | if (ecs->event_thread->stop_requested | |
5790 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5791 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5792 | |
f2ffa92b PA |
5793 | ecs->event_thread->suspend.stop_pc |
5794 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 5795 | |
2ab76a18 PA |
5796 | context_switch (ecs); |
5797 | ||
5798 | if (deprecated_context_hook) | |
5799 | deprecated_context_hook (ecs->event_thread->global_num); | |
5800 | ||
527159b7 | 5801 | if (debug_infrun) |
237fc4c9 | 5802 | { |
00431a78 | 5803 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 5804 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 5805 | |
1eb8556f SM |
5806 | infrun_debug_printf ("stop_pc=%s", |
5807 | paddress (reg_gdbarch, | |
5808 | ecs->event_thread->suspend.stop_pc)); | |
d92524f1 | 5809 | if (target_stopped_by_watchpoint ()) |
237fc4c9 | 5810 | { |
dda83cd7 | 5811 | CORE_ADDR addr; |
abbb1732 | 5812 | |
1eb8556f | 5813 | infrun_debug_printf ("stopped by watchpoint"); |
237fc4c9 | 5814 | |
8b88a78e | 5815 | if (target_stopped_data_address (current_top_target (), &addr)) |
1eb8556f | 5816 | infrun_debug_printf ("stopped data address=%s", |
dda83cd7 SM |
5817 | paddress (reg_gdbarch, addr)); |
5818 | else | |
1eb8556f | 5819 | infrun_debug_printf ("(no data address available)"); |
237fc4c9 PA |
5820 | } |
5821 | } | |
527159b7 | 5822 | |
36fa8042 PA |
5823 | /* This is originated from start_remote(), start_inferior() and |
5824 | shared libraries hook functions. */ | |
00431a78 | 5825 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
5826 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
5827 | { | |
1eb8556f | 5828 | infrun_debug_printf ("quietly stopped"); |
c4464ade | 5829 | stop_print_frame = true; |
22bcd14b | 5830 | stop_waiting (ecs); |
36fa8042 PA |
5831 | return; |
5832 | } | |
5833 | ||
36fa8042 PA |
5834 | /* This originates from attach_command(). We need to overwrite |
5835 | the stop_signal here, because some kernels don't ignore a | |
5836 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5837 | See more comments in inferior.h. On the other hand, if we | |
5838 | get a non-SIGSTOP, report it to the user - assume the backend | |
5839 | will handle the SIGSTOP if it should show up later. | |
5840 | ||
5841 | Also consider that the attach is complete when we see a | |
5842 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5843 | target extended-remote report it instead of a SIGSTOP | |
5844 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5845 | signal, so this is no exception. | |
5846 | ||
5847 | Also consider that the attach is complete when we see a | |
5848 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5849 | the target to stop all threads of the inferior, in case the | |
5850 | low level attach operation doesn't stop them implicitly. If | |
5851 | they weren't stopped implicitly, then the stub will report a | |
5852 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5853 | other than GDB's request. */ | |
5854 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5855 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5856 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5857 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5858 | { | |
c4464ade | 5859 | stop_print_frame = true; |
22bcd14b | 5860 | stop_waiting (ecs); |
36fa8042 PA |
5861 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5862 | return; | |
5863 | } | |
5864 | ||
568d6575 UW |
5865 | /* At this point, get hold of the now-current thread's frame. */ |
5866 | frame = get_current_frame (); | |
5867 | gdbarch = get_frame_arch (frame); | |
5868 | ||
2adfaa28 | 5869 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5870 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5871 | { |
af48d08f | 5872 | struct regcache *regcache; |
af48d08f | 5873 | CORE_ADDR pc; |
2adfaa28 | 5874 | |
00431a78 | 5875 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
5876 | const address_space *aspace = regcache->aspace (); |
5877 | ||
af48d08f | 5878 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 5879 | |
af48d08f PA |
5880 | /* However, before doing so, if this single-step breakpoint was |
5881 | actually for another thread, set this thread up for moving | |
5882 | past it. */ | |
5883 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5884 | aspace, pc)) | |
5885 | { | |
5886 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 | 5887 | { |
1eb8556f SM |
5888 | infrun_debug_printf ("[%s] hit another thread's single-step " |
5889 | "breakpoint", | |
5890 | target_pid_to_str (ecs->ptid).c_str ()); | |
af48d08f PA |
5891 | ecs->hit_singlestep_breakpoint = 1; |
5892 | } | |
5893 | } | |
5894 | else | |
5895 | { | |
1eb8556f SM |
5896 | infrun_debug_printf ("[%s] hit its single-step breakpoint", |
5897 | target_pid_to_str (ecs->ptid).c_str ()); | |
2adfaa28 | 5898 | } |
488f131b | 5899 | } |
af48d08f | 5900 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5901 | |
963f9c80 PA |
5902 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5903 | && ecs->event_thread->control.trap_expected | |
5904 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5905 | stopped_by_watchpoint = 0; |
5906 | else | |
5907 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5908 | ||
5909 | /* If necessary, step over this watchpoint. We'll be back to display | |
5910 | it in a moment. */ | |
5911 | if (stopped_by_watchpoint | |
9aed480c | 5912 | && (target_have_steppable_watchpoint () |
568d6575 | 5913 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5914 | { |
488f131b | 5915 | /* At this point, we are stopped at an instruction which has |
dda83cd7 SM |
5916 | attempted to write to a piece of memory under control of |
5917 | a watchpoint. The instruction hasn't actually executed | |
5918 | yet. If we were to evaluate the watchpoint expression | |
5919 | now, we would get the old value, and therefore no change | |
5920 | would seem to have occurred. | |
5921 | ||
5922 | In order to make watchpoints work `right', we really need | |
5923 | to complete the memory write, and then evaluate the | |
5924 | watchpoint expression. We do this by single-stepping the | |
d983da9c DJ |
5925 | target. |
5926 | ||
7f89fd65 | 5927 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5928 | it. For example, the PA can (with some kernel cooperation) |
5929 | single step over a watchpoint without disabling the watchpoint. | |
5930 | ||
5931 | It is far more common to need to disable a watchpoint to step | |
5932 | the inferior over it. If we have non-steppable watchpoints, | |
5933 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5934 | disable all watchpoints. |
5935 | ||
5936 | Any breakpoint at PC must also be stepped over -- if there's | |
5937 | one, it will have already triggered before the watchpoint | |
5938 | triggered, and we either already reported it to the user, or | |
5939 | it didn't cause a stop and we called keep_going. In either | |
5940 | case, if there was a breakpoint at PC, we must be trying to | |
5941 | step past it. */ | |
5942 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5943 | keep_going (ecs); | |
488f131b JB |
5944 | return; |
5945 | } | |
5946 | ||
4e1c45ea | 5947 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5948 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5949 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5950 | ecs->event_thread->control.stop_step = 0; | |
c4464ade | 5951 | stop_print_frame = true; |
488f131b | 5952 | stopped_by_random_signal = 0; |
ddfe970e | 5953 | bpstat stop_chain = NULL; |
488f131b | 5954 | |
edb3359d DJ |
5955 | /* Hide inlined functions starting here, unless we just performed stepi or |
5956 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5957 | inline function call sites). */ | |
16c381f0 | 5958 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 5959 | { |
00431a78 PA |
5960 | const address_space *aspace |
5961 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
5962 | |
5963 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5964 | determine that the address is one where functions cannot have | |
5965 | been inlined. This improves performance with inferiors that | |
5966 | load a lot of shared libraries, because the solib event | |
5967 | breakpoint is defined as the address of a function (i.e. not | |
5968 | inline). Note that we have to check the previous PC as well | |
5969 | as the current one to catch cases when we have just | |
5970 | single-stepped off a breakpoint prior to reinstating it. | |
5971 | Note that we're assuming that the code we single-step to is | |
5972 | not inline, but that's not definitive: there's nothing | |
5973 | preventing the event breakpoint function from containing | |
5974 | inlined code, and the single-step ending up there. If the | |
5975 | user had set a breakpoint on that inlined code, the missing | |
5976 | skip_inline_frames call would break things. Fortunately | |
5977 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
5978 | if (!pc_at_non_inline_function (aspace, |
5979 | ecs->event_thread->suspend.stop_pc, | |
5980 | &ecs->ws) | |
a210c238 MR |
5981 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5982 | && ecs->event_thread->control.trap_expected | |
5983 | && pc_at_non_inline_function (aspace, | |
5984 | ecs->event_thread->prev_pc, | |
09ac7c10 | 5985 | &ecs->ws))) |
1c5a993e | 5986 | { |
f2ffa92b PA |
5987 | stop_chain = build_bpstat_chain (aspace, |
5988 | ecs->event_thread->suspend.stop_pc, | |
5989 | &ecs->ws); | |
00431a78 | 5990 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
5991 | |
5992 | /* Re-fetch current thread's frame in case that invalidated | |
5993 | the frame cache. */ | |
5994 | frame = get_current_frame (); | |
5995 | gdbarch = get_frame_arch (frame); | |
5996 | } | |
0574c78f | 5997 | } |
edb3359d | 5998 | |
a493e3e2 | 5999 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 6000 | && ecs->event_thread->control.trap_expected |
568d6575 | 6001 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6002 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6003 | { |
b50d7442 | 6004 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6005 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6006 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6007 | with a delay slot. It needs to be stepped twice, once for |
6008 | the instruction and once for the delay slot. */ | |
6009 | int step_through_delay | |
568d6575 | 6010 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6011 | |
1eb8556f SM |
6012 | if (step_through_delay) |
6013 | infrun_debug_printf ("step through delay"); | |
6014 | ||
16c381f0 JK |
6015 | if (ecs->event_thread->control.step_range_end == 0 |
6016 | && step_through_delay) | |
3352ef37 AC |
6017 | { |
6018 | /* The user issued a continue when stopped at a breakpoint. | |
6019 | Set up for another trap and get out of here. */ | |
dda83cd7 SM |
6020 | ecs->event_thread->stepping_over_breakpoint = 1; |
6021 | keep_going (ecs); | |
6022 | return; | |
3352ef37 AC |
6023 | } |
6024 | else if (step_through_delay) | |
6025 | { | |
6026 | /* The user issued a step when stopped at a breakpoint. | |
6027 | Maybe we should stop, maybe we should not - the delay | |
6028 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6029 | case, don't decide that here, just set |
6030 | ecs->stepping_over_breakpoint, making sure we | |
6031 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6032 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6033 | } |
6034 | } | |
6035 | ||
ab04a2af TT |
6036 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6037 | handles this event. */ | |
6038 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6039 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
6040 | ecs->event_thread->suspend.stop_pc, |
6041 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 6042 | |
ab04a2af TT |
6043 | /* Following in case break condition called a |
6044 | function. */ | |
c4464ade | 6045 | stop_print_frame = true; |
73dd234f | 6046 | |
ab04a2af TT |
6047 | /* This is where we handle "moribund" watchpoints. Unlike |
6048 | software breakpoints traps, hardware watchpoint traps are | |
6049 | always distinguishable from random traps. If no high-level | |
6050 | watchpoint is associated with the reported stop data address | |
6051 | anymore, then the bpstat does not explain the signal --- | |
6052 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6053 | set. */ | |
6054 | ||
1eb8556f | 6055 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
47591c29 | 6056 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6057 | GDB_SIGNAL_TRAP) |
ab04a2af | 6058 | && stopped_by_watchpoint) |
1eb8556f SM |
6059 | { |
6060 | infrun_debug_printf ("no user watchpoint explains watchpoint SIGTRAP, " | |
6061 | "ignoring"); | |
6062 | } | |
73dd234f | 6063 | |
bac7d97b | 6064 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6065 | at one stage in the past included checks for an inferior |
6066 | function call's call dummy's return breakpoint. The original | |
6067 | comment, that went with the test, read: | |
03cebad2 | 6068 | |
ab04a2af TT |
6069 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6070 | another signal besides SIGTRAP, so check here as well as | |
6071 | above.'' | |
73dd234f | 6072 | |
ab04a2af TT |
6073 | If someone ever tries to get call dummys on a |
6074 | non-executable stack to work (where the target would stop | |
6075 | with something like a SIGSEGV), then those tests might need | |
6076 | to be re-instated. Given, however, that the tests were only | |
6077 | enabled when momentary breakpoints were not being used, I | |
6078 | suspect that it won't be the case. | |
488f131b | 6079 | |
ab04a2af TT |
6080 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6081 | be necessary for call dummies on a non-executable stack on | |
6082 | SPARC. */ | |
488f131b | 6083 | |
bac7d97b | 6084 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6085 | random_signal |
6086 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
6087 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 6088 | |
1cf4d951 PA |
6089 | /* Maybe this was a trap for a software breakpoint that has since |
6090 | been removed. */ | |
6091 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6092 | { | |
5133a315 LM |
6093 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
6094 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
6095 | { |
6096 | struct regcache *regcache; | |
6097 | int decr_pc; | |
6098 | ||
6099 | /* Re-adjust PC to what the program would see if GDB was not | |
6100 | debugging it. */ | |
00431a78 | 6101 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6102 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6103 | if (decr_pc != 0) |
6104 | { | |
07036511 TT |
6105 | gdb::optional<scoped_restore_tmpl<int>> |
6106 | restore_operation_disable; | |
1cf4d951 PA |
6107 | |
6108 | if (record_full_is_used ()) | |
07036511 TT |
6109 | restore_operation_disable.emplace |
6110 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6111 | |
f2ffa92b PA |
6112 | regcache_write_pc (regcache, |
6113 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
6114 | } |
6115 | } | |
6116 | else | |
6117 | { | |
6118 | /* A delayed software breakpoint event. Ignore the trap. */ | |
1eb8556f | 6119 | infrun_debug_printf ("delayed software breakpoint trap, ignoring"); |
1cf4d951 PA |
6120 | random_signal = 0; |
6121 | } | |
6122 | } | |
6123 | ||
6124 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6125 | has since been removed. */ | |
6126 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6127 | { | |
6128 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
1eb8556f SM |
6129 | infrun_debug_printf ("delayed hardware breakpoint/watchpoint " |
6130 | "trap, ignoring"); | |
1cf4d951 PA |
6131 | random_signal = 0; |
6132 | } | |
6133 | ||
bac7d97b PA |
6134 | /* If not, perhaps stepping/nexting can. */ |
6135 | if (random_signal) | |
6136 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6137 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6138 | |
2adfaa28 PA |
6139 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6140 | thread. Single-step breakpoints are transparent to the | |
6141 | breakpoints module. */ | |
6142 | if (random_signal) | |
6143 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6144 | ||
bac7d97b PA |
6145 | /* No? Perhaps we got a moribund watchpoint. */ |
6146 | if (random_signal) | |
6147 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6148 | |
c65d6b55 PA |
6149 | /* Always stop if the user explicitly requested this thread to |
6150 | remain stopped. */ | |
6151 | if (ecs->event_thread->stop_requested) | |
6152 | { | |
6153 | random_signal = 1; | |
1eb8556f | 6154 | infrun_debug_printf ("user-requested stop"); |
c65d6b55 PA |
6155 | } |
6156 | ||
488f131b JB |
6157 | /* For the program's own signals, act according to |
6158 | the signal handling tables. */ | |
6159 | ||
ce12b012 | 6160 | if (random_signal) |
488f131b JB |
6161 | { |
6162 | /* Signal not for debugging purposes. */ | |
c9737c08 | 6163 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6164 | |
1eb8556f SM |
6165 | infrun_debug_printf ("random signal (%s)", |
6166 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6167 | |
488f131b JB |
6168 | stopped_by_random_signal = 1; |
6169 | ||
252fbfc8 PA |
6170 | /* Always stop on signals if we're either just gaining control |
6171 | of the program, or the user explicitly requested this thread | |
6172 | to remain stopped. */ | |
d6b48e9c | 6173 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6174 | || ecs->event_thread->stop_requested |
8ff53139 | 6175 | || signal_stop_state (ecs->event_thread->suspend.stop_signal)) |
488f131b | 6176 | { |
22bcd14b | 6177 | stop_waiting (ecs); |
488f131b JB |
6178 | return; |
6179 | } | |
b57bacec PA |
6180 | |
6181 | /* Notify observers the signal has "handle print" set. Note we | |
6182 | returned early above if stopping; normal_stop handles the | |
6183 | printing in that case. */ | |
6184 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6185 | { | |
6186 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6187 | target_terminal::ours_for_output (); |
76727919 | 6188 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 6189 | target_terminal::inferior (); |
b57bacec | 6190 | } |
488f131b JB |
6191 | |
6192 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6193 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6194 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6195 | |
f2ffa92b | 6196 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 6197 | && ecs->event_thread->control.trap_expected |
8358c15c | 6198 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6199 | { |
6200 | /* We were just starting a new sequence, attempting to | |
6201 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6202 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6203 | of the stepping range so GDB needs to remember to, when |
6204 | the signal handler returns, resume stepping off that | |
6205 | breakpoint. */ | |
6206 | /* To simplify things, "continue" is forced to use the same | |
6207 | code paths as single-step - set a breakpoint at the | |
6208 | signal return address and then, once hit, step off that | |
6209 | breakpoint. */ | |
1eb8556f | 6210 | infrun_debug_printf ("signal arrived while stepping over breakpoint"); |
d3169d93 | 6211 | |
2c03e5be | 6212 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6213 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6214 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6215 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6216 | |
6217 | /* If we were nexting/stepping some other thread, switch to | |
6218 | it, so that we don't continue it, losing control. */ | |
6219 | if (!switch_back_to_stepped_thread (ecs)) | |
6220 | keep_going (ecs); | |
9d799f85 | 6221 | return; |
68f53502 | 6222 | } |
9d799f85 | 6223 | |
e5f8a7cc | 6224 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
6225 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6226 | ecs->event_thread) | |
e5f8a7cc | 6227 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 6228 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6229 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6230 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6231 | { |
6232 | /* The inferior is about to take a signal that will take it | |
6233 | out of the single step range. Set a breakpoint at the | |
6234 | current PC (which is presumably where the signal handler | |
6235 | will eventually return) and then allow the inferior to | |
6236 | run free. | |
6237 | ||
6238 | Note that this is only needed for a signal delivered | |
6239 | while in the single-step range. Nested signals aren't a | |
6240 | problem as they eventually all return. */ | |
1eb8556f | 6241 | infrun_debug_printf ("signal may take us out of single-step range"); |
237fc4c9 | 6242 | |
372316f1 | 6243 | clear_step_over_info (); |
2c03e5be | 6244 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6245 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6246 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6247 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6248 | keep_going (ecs); |
6249 | return; | |
d303a6c7 | 6250 | } |
9d799f85 | 6251 | |
85102364 | 6252 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6253 | when either there's a nested signal, or when there's a |
6254 | pending signal enabled just as the signal handler returns | |
6255 | (leaving the inferior at the step-resume-breakpoint without | |
6256 | actually executing it). Either way continue until the | |
6257 | breakpoint is really hit. */ | |
c447ac0b PA |
6258 | |
6259 | if (!switch_back_to_stepped_thread (ecs)) | |
6260 | { | |
1eb8556f | 6261 | infrun_debug_printf ("random signal, keep going"); |
c447ac0b PA |
6262 | |
6263 | keep_going (ecs); | |
6264 | } | |
6265 | return; | |
488f131b | 6266 | } |
94c57d6a PA |
6267 | |
6268 | process_event_stop_test (ecs); | |
6269 | } | |
6270 | ||
6271 | /* Come here when we've got some debug event / signal we can explain | |
6272 | (IOW, not a random signal), and test whether it should cause a | |
6273 | stop, or whether we should resume the inferior (transparently). | |
6274 | E.g., could be a breakpoint whose condition evaluates false; we | |
6275 | could be still stepping within the line; etc. */ | |
6276 | ||
6277 | static void | |
6278 | process_event_stop_test (struct execution_control_state *ecs) | |
6279 | { | |
6280 | struct symtab_and_line stop_pc_sal; | |
6281 | struct frame_info *frame; | |
6282 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6283 | CORE_ADDR jmp_buf_pc; |
6284 | struct bpstat_what what; | |
94c57d6a | 6285 | |
cdaa5b73 | 6286 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6287 | |
cdaa5b73 PA |
6288 | frame = get_current_frame (); |
6289 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6290 | |
cdaa5b73 | 6291 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6292 | |
cdaa5b73 PA |
6293 | if (what.call_dummy) |
6294 | { | |
6295 | stop_stack_dummy = what.call_dummy; | |
6296 | } | |
186c406b | 6297 | |
243a9253 PA |
6298 | /* A few breakpoint types have callbacks associated (e.g., |
6299 | bp_jit_event). Run them now. */ | |
6300 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6301 | ||
cdaa5b73 PA |
6302 | /* If we hit an internal event that triggers symbol changes, the |
6303 | current frame will be invalidated within bpstat_what (e.g., if we | |
6304 | hit an internal solib event). Re-fetch it. */ | |
6305 | frame = get_current_frame (); | |
6306 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6307 | |
cdaa5b73 PA |
6308 | switch (what.main_action) |
6309 | { | |
6310 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6311 | /* If we hit the breakpoint at longjmp while stepping, we | |
6312 | install a momentary breakpoint at the target of the | |
6313 | jmp_buf. */ | |
186c406b | 6314 | |
1eb8556f | 6315 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME"); |
186c406b | 6316 | |
cdaa5b73 | 6317 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6318 | |
cdaa5b73 PA |
6319 | if (what.is_longjmp) |
6320 | { | |
6321 | struct value *arg_value; | |
6322 | ||
6323 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6324 | then use it to extract the arguments. The destination PC | |
6325 | is the third argument to the probe. */ | |
6326 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6327 | if (arg_value) | |
8fa0c4f8 AA |
6328 | { |
6329 | jmp_buf_pc = value_as_address (arg_value); | |
6330 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6331 | } | |
cdaa5b73 PA |
6332 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6333 | || !gdbarch_get_longjmp_target (gdbarch, | |
6334 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6335 | { |
1eb8556f SM |
6336 | infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME " |
6337 | "(!gdbarch_get_longjmp_target)"); | |
cdaa5b73 PA |
6338 | keep_going (ecs); |
6339 | return; | |
e2e4d78b | 6340 | } |
e2e4d78b | 6341 | |
cdaa5b73 PA |
6342 | /* Insert a breakpoint at resume address. */ |
6343 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6344 | } | |
6345 | else | |
6346 | check_exception_resume (ecs, frame); | |
6347 | keep_going (ecs); | |
6348 | return; | |
e81a37f7 | 6349 | |
cdaa5b73 PA |
6350 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6351 | { | |
6352 | struct frame_info *init_frame; | |
e81a37f7 | 6353 | |
cdaa5b73 | 6354 | /* There are several cases to consider. |
c906108c | 6355 | |
cdaa5b73 PA |
6356 | 1. The initiating frame no longer exists. In this case we |
6357 | must stop, because the exception or longjmp has gone too | |
6358 | far. | |
2c03e5be | 6359 | |
cdaa5b73 PA |
6360 | 2. The initiating frame exists, and is the same as the |
6361 | current frame. We stop, because the exception or longjmp | |
6362 | has been caught. | |
2c03e5be | 6363 | |
cdaa5b73 PA |
6364 | 3. The initiating frame exists and is different from the |
6365 | current frame. This means the exception or longjmp has | |
6366 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6367 | |
cdaa5b73 PA |
6368 | 4. longjmp breakpoint has been placed just to protect |
6369 | against stale dummy frames and user is not interested in | |
6370 | stopping around longjmps. */ | |
c5aa993b | 6371 | |
1eb8556f | 6372 | infrun_debug_printf ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME"); |
c5aa993b | 6373 | |
cdaa5b73 PA |
6374 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6375 | != NULL); | |
6376 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6377 | |
cdaa5b73 PA |
6378 | if (what.is_longjmp) |
6379 | { | |
b67a2c6f | 6380 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6381 | |
cdaa5b73 | 6382 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6383 | { |
cdaa5b73 PA |
6384 | /* Case 4. */ |
6385 | keep_going (ecs); | |
6386 | return; | |
e5ef252a | 6387 | } |
cdaa5b73 | 6388 | } |
c5aa993b | 6389 | |
cdaa5b73 | 6390 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6391 | |
cdaa5b73 PA |
6392 | if (init_frame) |
6393 | { | |
6394 | struct frame_id current_id | |
6395 | = get_frame_id (get_current_frame ()); | |
6396 | if (frame_id_eq (current_id, | |
6397 | ecs->event_thread->initiating_frame)) | |
6398 | { | |
6399 | /* Case 2. Fall through. */ | |
6400 | } | |
6401 | else | |
6402 | { | |
6403 | /* Case 3. */ | |
6404 | keep_going (ecs); | |
6405 | return; | |
6406 | } | |
68f53502 | 6407 | } |
488f131b | 6408 | |
cdaa5b73 PA |
6409 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6410 | exists. */ | |
6411 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6412 | |
bdc36728 | 6413 | end_stepping_range (ecs); |
cdaa5b73 PA |
6414 | } |
6415 | return; | |
e5ef252a | 6416 | |
cdaa5b73 | 6417 | case BPSTAT_WHAT_SINGLE: |
1eb8556f | 6418 | infrun_debug_printf ("BPSTAT_WHAT_SINGLE"); |
cdaa5b73 PA |
6419 | ecs->event_thread->stepping_over_breakpoint = 1; |
6420 | /* Still need to check other stuff, at least the case where we | |
6421 | are stepping and step out of the right range. */ | |
6422 | break; | |
e5ef252a | 6423 | |
cdaa5b73 | 6424 | case BPSTAT_WHAT_STEP_RESUME: |
1eb8556f | 6425 | infrun_debug_printf ("BPSTAT_WHAT_STEP_RESUME"); |
e5ef252a | 6426 | |
cdaa5b73 PA |
6427 | delete_step_resume_breakpoint (ecs->event_thread); |
6428 | if (ecs->event_thread->control.proceed_to_finish | |
6429 | && execution_direction == EXEC_REVERSE) | |
6430 | { | |
6431 | struct thread_info *tp = ecs->event_thread; | |
6432 | ||
6433 | /* We are finishing a function in reverse, and just hit the | |
6434 | step-resume breakpoint at the start address of the | |
6435 | function, and we're almost there -- just need to back up | |
6436 | by one more single-step, which should take us back to the | |
6437 | function call. */ | |
6438 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6439 | keep_going (ecs); | |
e5ef252a | 6440 | return; |
cdaa5b73 PA |
6441 | } |
6442 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6443 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6444 | && execution_direction == EXEC_REVERSE) |
6445 | { | |
6446 | /* We are stepping over a function call in reverse, and just | |
6447 | hit the step-resume breakpoint at the start address of | |
6448 | the function. Go back to single-stepping, which should | |
6449 | take us back to the function call. */ | |
6450 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6451 | keep_going (ecs); | |
6452 | return; | |
6453 | } | |
6454 | break; | |
e5ef252a | 6455 | |
cdaa5b73 | 6456 | case BPSTAT_WHAT_STOP_NOISY: |
1eb8556f | 6457 | infrun_debug_printf ("BPSTAT_WHAT_STOP_NOISY"); |
c4464ade | 6458 | stop_print_frame = true; |
e5ef252a | 6459 | |
33bf4c5c | 6460 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6461 | whether a/the breakpoint is there when the thread is next |
6462 | resumed. */ | |
6463 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6464 | |
22bcd14b | 6465 | stop_waiting (ecs); |
cdaa5b73 | 6466 | return; |
e5ef252a | 6467 | |
cdaa5b73 | 6468 | case BPSTAT_WHAT_STOP_SILENT: |
1eb8556f | 6469 | infrun_debug_printf ("BPSTAT_WHAT_STOP_SILENT"); |
c4464ade | 6470 | stop_print_frame = false; |
e5ef252a | 6471 | |
33bf4c5c | 6472 | /* Assume the thread stopped for a breakpoint. We'll still check |
99619bea PA |
6473 | whether a/the breakpoint is there when the thread is next |
6474 | resumed. */ | |
6475 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6476 | stop_waiting (ecs); |
cdaa5b73 PA |
6477 | return; |
6478 | ||
6479 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
1eb8556f | 6480 | infrun_debug_printf ("BPSTAT_WHAT_HP_STEP_RESUME"); |
cdaa5b73 PA |
6481 | |
6482 | delete_step_resume_breakpoint (ecs->event_thread); | |
6483 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6484 | { | |
6485 | /* Back when the step-resume breakpoint was inserted, we | |
6486 | were trying to single-step off a breakpoint. Go back to | |
6487 | doing that. */ | |
6488 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6489 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6490 | keep_going (ecs); | |
6491 | return; | |
e5ef252a | 6492 | } |
cdaa5b73 PA |
6493 | break; |
6494 | ||
6495 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6496 | break; | |
e5ef252a | 6497 | } |
c906108c | 6498 | |
af48d08f PA |
6499 | /* If we stepped a permanent breakpoint and we had a high priority |
6500 | step-resume breakpoint for the address we stepped, but we didn't | |
6501 | hit it, then we must have stepped into the signal handler. The | |
6502 | step-resume was only necessary to catch the case of _not_ | |
6503 | stepping into the handler, so delete it, and fall through to | |
6504 | checking whether the step finished. */ | |
6505 | if (ecs->event_thread->stepped_breakpoint) | |
6506 | { | |
6507 | struct breakpoint *sr_bp | |
6508 | = ecs->event_thread->control.step_resume_breakpoint; | |
6509 | ||
8d707a12 PA |
6510 | if (sr_bp != NULL |
6511 | && sr_bp->loc->permanent | |
af48d08f PA |
6512 | && sr_bp->type == bp_hp_step_resume |
6513 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6514 | { | |
1eb8556f | 6515 | infrun_debug_printf ("stepped permanent breakpoint, stopped in handler"); |
af48d08f PA |
6516 | delete_step_resume_breakpoint (ecs->event_thread); |
6517 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6518 | } | |
6519 | } | |
6520 | ||
cdaa5b73 PA |
6521 | /* We come here if we hit a breakpoint but should not stop for it. |
6522 | Possibly we also were stepping and should stop for that. So fall | |
6523 | through and test for stepping. But, if not stepping, do not | |
6524 | stop. */ | |
c906108c | 6525 | |
a7212384 UW |
6526 | /* In all-stop mode, if we're currently stepping but have stopped in |
6527 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6528 | if (switch_back_to_stepped_thread (ecs)) |
6529 | return; | |
776f04fa | 6530 | |
8358c15c | 6531 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6532 | { |
1eb8556f | 6533 | infrun_debug_printf ("step-resume breakpoint is inserted"); |
527159b7 | 6534 | |
488f131b | 6535 | /* Having a step-resume breakpoint overrides anything |
dda83cd7 SM |
6536 | else having to do with stepping commands until |
6537 | that breakpoint is reached. */ | |
488f131b JB |
6538 | keep_going (ecs); |
6539 | return; | |
6540 | } | |
c5aa993b | 6541 | |
16c381f0 | 6542 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6543 | { |
1eb8556f | 6544 | infrun_debug_printf ("no stepping, continue"); |
488f131b | 6545 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6546 | keep_going (ecs); |
6547 | return; | |
6548 | } | |
c5aa993b | 6549 | |
4b7703ad JB |
6550 | /* Re-fetch current thread's frame in case the code above caused |
6551 | the frame cache to be re-initialized, making our FRAME variable | |
6552 | a dangling pointer. */ | |
6553 | frame = get_current_frame (); | |
628fe4e4 | 6554 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6555 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6556 | |
488f131b | 6557 | /* If stepping through a line, keep going if still within it. |
c906108c | 6558 | |
488f131b JB |
6559 | Note that step_range_end is the address of the first instruction |
6560 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6561 | within it! |
6562 | ||
6563 | Note also that during reverse execution, we may be stepping | |
6564 | through a function epilogue and therefore must detect when | |
6565 | the current-frame changes in the middle of a line. */ | |
6566 | ||
f2ffa92b PA |
6567 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6568 | ecs->event_thread) | |
31410e84 | 6569 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6570 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6571 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6572 | { |
1eb8556f SM |
6573 | infrun_debug_printf |
6574 | ("stepping inside range [%s-%s]", | |
6575 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
6576 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6577 | |
c1e36e3e PA |
6578 | /* Tentatively re-enable range stepping; `resume' disables it if |
6579 | necessary (e.g., if we're stepping over a breakpoint or we | |
6580 | have software watchpoints). */ | |
6581 | ecs->event_thread->control.may_range_step = 1; | |
6582 | ||
b2175913 MS |
6583 | /* When stepping backward, stop at beginning of line range |
6584 | (unless it's the function entry point, in which case | |
6585 | keep going back to the call point). */ | |
f2ffa92b | 6586 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6587 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6588 | && stop_pc != ecs->stop_func_start |
6589 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6590 | end_stepping_range (ecs); |
b2175913 MS |
6591 | else |
6592 | keep_going (ecs); | |
6593 | ||
488f131b JB |
6594 | return; |
6595 | } | |
c5aa993b | 6596 | |
488f131b | 6597 | /* We stepped out of the stepping range. */ |
c906108c | 6598 | |
488f131b | 6599 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6600 | loader dynamic symbol resolution code... |
6601 | ||
6602 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6603 | time loader code and reach the callee's address. | |
6604 | ||
6605 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6606 | the runtime loader code is handled just like any other | |
6607 | undebuggable function call. Now we need only keep stepping | |
6608 | backward through the trampoline code, and that's handled further | |
6609 | down, so there is nothing for us to do here. */ | |
6610 | ||
6611 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6612 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6613 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6614 | { |
4c8c40e6 | 6615 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6616 | gdbarch_skip_solib_resolver (gdbarch, |
6617 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6618 | |
1eb8556f | 6619 | infrun_debug_printf ("stepped into dynsym resolve code"); |
527159b7 | 6620 | |
488f131b JB |
6621 | if (pc_after_resolver) |
6622 | { | |
6623 | /* Set up a step-resume breakpoint at the address | |
6624 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6625 | symtab_and_line sr_sal; |
488f131b | 6626 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6627 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6628 | |
a6d9a66e UW |
6629 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6630 | sr_sal, null_frame_id); | |
c5aa993b | 6631 | } |
c906108c | 6632 | |
488f131b JB |
6633 | keep_going (ecs); |
6634 | return; | |
6635 | } | |
c906108c | 6636 | |
1d509aa6 MM |
6637 | /* Step through an indirect branch thunk. */ |
6638 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6639 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6640 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 | 6641 | { |
1eb8556f | 6642 | infrun_debug_printf ("stepped into indirect branch thunk"); |
1d509aa6 MM |
6643 | keep_going (ecs); |
6644 | return; | |
6645 | } | |
6646 | ||
16c381f0 JK |
6647 | if (ecs->event_thread->control.step_range_end != 1 |
6648 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6649 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6650 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6651 | { |
1eb8556f | 6652 | infrun_debug_printf ("stepped into signal trampoline"); |
42edda50 | 6653 | /* The inferior, while doing a "step" or "next", has ended up in |
dda83cd7 SM |
6654 | a signal trampoline (either by a signal being delivered or by |
6655 | the signal handler returning). Just single-step until the | |
6656 | inferior leaves the trampoline (either by calling the handler | |
6657 | or returning). */ | |
488f131b JB |
6658 | keep_going (ecs); |
6659 | return; | |
6660 | } | |
c906108c | 6661 | |
14132e89 MR |
6662 | /* If we're in the return path from a shared library trampoline, |
6663 | we want to proceed through the trampoline when stepping. */ | |
6664 | /* macro/2012-04-25: This needs to come before the subroutine | |
6665 | call check below as on some targets return trampolines look | |
6666 | like subroutine calls (MIPS16 return thunks). */ | |
6667 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
6668 | ecs->event_thread->suspend.stop_pc, |
6669 | ecs->stop_func_name) | |
14132e89 MR |
6670 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6671 | { | |
6672 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
6673 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6674 | CORE_ADDR real_stop_pc | |
6675 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 | 6676 | |
1eb8556f | 6677 | infrun_debug_printf ("stepped into solib return tramp"); |
14132e89 MR |
6678 | |
6679 | /* Only proceed through if we know where it's going. */ | |
6680 | if (real_stop_pc) | |
6681 | { | |
6682 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6683 | symtab_and_line sr_sal; |
14132e89 MR |
6684 | sr_sal.pc = real_stop_pc; |
6685 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6686 | sr_sal.pspace = get_frame_program_space (frame); | |
6687 | ||
6688 | /* Do not specify what the fp should be when we stop since | |
6689 | on some machines the prologue is where the new fp value | |
6690 | is established. */ | |
6691 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6692 | sr_sal, null_frame_id); | |
6693 | ||
6694 | /* Restart without fiddling with the step ranges or | |
6695 | other state. */ | |
6696 | keep_going (ecs); | |
6697 | return; | |
6698 | } | |
6699 | } | |
6700 | ||
c17eaafe DJ |
6701 | /* Check for subroutine calls. The check for the current frame |
6702 | equalling the step ID is not necessary - the check of the | |
6703 | previous frame's ID is sufficient - but it is a common case and | |
6704 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6705 | |
6706 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6707 | being equal, so to get into this block, both the current and | |
6708 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6709 | /* The outer_frame_id check is a heuristic to detect stepping |
6710 | through startup code. If we step over an instruction which | |
6711 | sets the stack pointer from an invalid value to a valid value, | |
6712 | we may detect that as a subroutine call from the mythical | |
6713 | "outermost" function. This could be fixed by marking | |
6714 | outermost frames as !stack_p,code_p,special_p. Then the | |
6715 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6716 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6717 | for more. */ |
edb3359d | 6718 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6719 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6720 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6721 | ecs->event_thread->control.step_stack_frame_id) |
6722 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6723 | outer_frame_id) |
885eeb5b | 6724 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 6725 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 6726 | { |
f2ffa92b | 6727 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 6728 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6729 | |
1eb8556f | 6730 | infrun_debug_printf ("stepped into subroutine"); |
527159b7 | 6731 | |
b7a084be | 6732 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6733 | { |
6734 | /* I presume that step_over_calls is only 0 when we're | |
6735 | supposed to be stepping at the assembly language level | |
6736 | ("stepi"). Just stop. */ | |
388a8562 | 6737 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6738 | end_stepping_range (ecs); |
95918acb AC |
6739 | return; |
6740 | } | |
8fb3e588 | 6741 | |
388a8562 MS |
6742 | /* Reverse stepping through solib trampolines. */ |
6743 | ||
6744 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6745 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6746 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6747 | || (ecs->stop_func_start == 0 | |
6748 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6749 | { | |
6750 | /* Any solib trampoline code can be handled in reverse | |
6751 | by simply continuing to single-step. We have already | |
6752 | executed the solib function (backwards), and a few | |
6753 | steps will take us back through the trampoline to the | |
6754 | caller. */ | |
6755 | keep_going (ecs); | |
6756 | return; | |
6757 | } | |
6758 | ||
16c381f0 | 6759 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6760 | { |
b2175913 MS |
6761 | /* We're doing a "next". |
6762 | ||
6763 | Normal (forward) execution: set a breakpoint at the | |
6764 | callee's return address (the address at which the caller | |
6765 | will resume). | |
6766 | ||
6767 | Reverse (backward) execution. set the step-resume | |
6768 | breakpoint at the start of the function that we just | |
6769 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6770 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6771 | |
6772 | if (execution_direction == EXEC_REVERSE) | |
6773 | { | |
acf9414f JK |
6774 | /* If we're already at the start of the function, we've either |
6775 | just stepped backward into a single instruction function, | |
6776 | or stepped back out of a signal handler to the first instruction | |
6777 | of the function. Just keep going, which will single-step back | |
6778 | to the caller. */ | |
58c48e72 | 6779 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6780 | { |
acf9414f | 6781 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6782 | symtab_and_line sr_sal; |
acf9414f JK |
6783 | sr_sal.pc = ecs->stop_func_start; |
6784 | sr_sal.pspace = get_frame_program_space (frame); | |
6785 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6786 | sr_sal, null_frame_id); | |
6787 | } | |
b2175913 MS |
6788 | } |
6789 | else | |
568d6575 | 6790 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6791 | |
8567c30f AC |
6792 | keep_going (ecs); |
6793 | return; | |
6794 | } | |
a53c66de | 6795 | |
95918acb | 6796 | /* If we are in a function call trampoline (a stub between the |
dda83cd7 SM |
6797 | calling routine and the real function), locate the real |
6798 | function. That's what tells us (a) whether we want to step | |
6799 | into it at all, and (b) what prologue we want to run to the | |
6800 | end of, if we do step into it. */ | |
568d6575 | 6801 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6802 | if (real_stop_pc == 0) |
568d6575 | 6803 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6804 | if (real_stop_pc != 0) |
6805 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6806 | |
db5f024e | 6807 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6808 | { |
51abb421 | 6809 | symtab_and_line sr_sal; |
1b2bfbb9 | 6810 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6811 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6812 | |
a6d9a66e UW |
6813 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6814 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6815 | keep_going (ecs); |
6816 | return; | |
1b2bfbb9 RC |
6817 | } |
6818 | ||
95918acb | 6819 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6820 | thinking of stepping into and the function isn't on the skip |
6821 | list, step into it. | |
95918acb | 6822 | |
dda83cd7 SM |
6823 | If there are several symtabs at that PC (e.g. with include |
6824 | files), just want to know whether *any* of them have line | |
6825 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6826 | { |
6827 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6828 | |
95918acb | 6829 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6830 | if (tmp_sal.line != 0 |
85817405 | 6831 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
6832 | tmp_sal) |
6833 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 6834 | { |
b2175913 | 6835 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6836 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6837 | else |
568d6575 | 6838 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6839 | return; |
6840 | } | |
6841 | } | |
6842 | ||
6843 | /* If we have no line number and the step-stop-if-no-debug is | |
dda83cd7 SM |
6844 | set, we stop the step so that the user has a chance to switch |
6845 | in assembly mode. */ | |
16c381f0 | 6846 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6847 | && step_stop_if_no_debug) |
95918acb | 6848 | { |
bdc36728 | 6849 | end_stepping_range (ecs); |
95918acb AC |
6850 | return; |
6851 | } | |
6852 | ||
b2175913 MS |
6853 | if (execution_direction == EXEC_REVERSE) |
6854 | { | |
acf9414f JK |
6855 | /* If we're already at the start of the function, we've either just |
6856 | stepped backward into a single instruction function without line | |
6857 | number info, or stepped back out of a signal handler to the first | |
6858 | instruction of the function without line number info. Just keep | |
6859 | going, which will single-step back to the caller. */ | |
6860 | if (ecs->stop_func_start != stop_pc) | |
6861 | { | |
6862 | /* Set a breakpoint at callee's start address. | |
6863 | From there we can step once and be back in the caller. */ | |
51abb421 | 6864 | symtab_and_line sr_sal; |
acf9414f JK |
6865 | sr_sal.pc = ecs->stop_func_start; |
6866 | sr_sal.pspace = get_frame_program_space (frame); | |
6867 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6868 | sr_sal, null_frame_id); | |
6869 | } | |
b2175913 MS |
6870 | } |
6871 | else | |
6872 | /* Set a breakpoint at callee's return address (the address | |
6873 | at which the caller will resume). */ | |
568d6575 | 6874 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6875 | |
95918acb | 6876 | keep_going (ecs); |
488f131b | 6877 | return; |
488f131b | 6878 | } |
c906108c | 6879 | |
fdd654f3 MS |
6880 | /* Reverse stepping through solib trampolines. */ |
6881 | ||
6882 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6883 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 6884 | { |
f2ffa92b PA |
6885 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6886 | ||
fdd654f3 MS |
6887 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6888 | || (ecs->stop_func_start == 0 | |
6889 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6890 | { | |
6891 | /* Any solib trampoline code can be handled in reverse | |
6892 | by simply continuing to single-step. We have already | |
6893 | executed the solib function (backwards), and a few | |
6894 | steps will take us back through the trampoline to the | |
6895 | caller. */ | |
6896 | keep_going (ecs); | |
6897 | return; | |
6898 | } | |
6899 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6900 | { | |
6901 | /* Stepped backward into the solib dynsym resolver. | |
6902 | Set a breakpoint at its start and continue, then | |
6903 | one more step will take us out. */ | |
51abb421 | 6904 | symtab_and_line sr_sal; |
fdd654f3 | 6905 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 6906 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6907 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6908 | sr_sal, null_frame_id); | |
6909 | keep_going (ecs); | |
6910 | return; | |
6911 | } | |
6912 | } | |
6913 | ||
8c95582d AB |
6914 | /* This always returns the sal for the inner-most frame when we are in a |
6915 | stack of inlined frames, even if GDB actually believes that it is in a | |
6916 | more outer frame. This is checked for below by calls to | |
6917 | inline_skipped_frames. */ | |
f2ffa92b | 6918 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 6919 | |
1b2bfbb9 RC |
6920 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6921 | the trampoline processing logic, however, there are some trampolines | |
6922 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6923 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6924 | && ecs->stop_func_name == NULL |
2afb61aa | 6925 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6926 | { |
1eb8556f | 6927 | infrun_debug_printf ("stepped into undebuggable function"); |
527159b7 | 6928 | |
1b2bfbb9 | 6929 | /* The inferior just stepped into, or returned to, an |
dda83cd7 SM |
6930 | undebuggable function (where there is no debugging information |
6931 | and no line number corresponding to the address where the | |
6932 | inferior stopped). Since we want to skip this kind of code, | |
6933 | we keep going until the inferior returns from this | |
6934 | function - unless the user has asked us not to (via | |
6935 | set step-mode) or we no longer know how to get back | |
6936 | to the call site. */ | |
14e60db5 | 6937 | if (step_stop_if_no_debug |
c7ce8faa | 6938 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6939 | { |
6940 | /* If we have no line number and the step-stop-if-no-debug | |
6941 | is set, we stop the step so that the user has a chance to | |
6942 | switch in assembly mode. */ | |
bdc36728 | 6943 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6944 | return; |
6945 | } | |
6946 | else | |
6947 | { | |
6948 | /* Set a breakpoint at callee's return address (the address | |
6949 | at which the caller will resume). */ | |
568d6575 | 6950 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6951 | keep_going (ecs); |
6952 | return; | |
6953 | } | |
6954 | } | |
6955 | ||
16c381f0 | 6956 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6957 | { |
6958 | /* It is stepi or nexti. We always want to stop stepping after | |
dda83cd7 | 6959 | one instruction. */ |
1eb8556f | 6960 | infrun_debug_printf ("stepi/nexti"); |
bdc36728 | 6961 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6962 | return; |
6963 | } | |
6964 | ||
2afb61aa | 6965 | if (stop_pc_sal.line == 0) |
488f131b JB |
6966 | { |
6967 | /* We have no line number information. That means to stop | |
dda83cd7 SM |
6968 | stepping (does this always happen right after one instruction, |
6969 | when we do "s" in a function with no line numbers, | |
6970 | or can this happen as a result of a return or longjmp?). */ | |
1eb8556f | 6971 | infrun_debug_printf ("line number info"); |
bdc36728 | 6972 | end_stepping_range (ecs); |
488f131b JB |
6973 | return; |
6974 | } | |
c906108c | 6975 | |
edb3359d DJ |
6976 | /* Look for "calls" to inlined functions, part one. If the inline |
6977 | frame machinery detected some skipped call sites, we have entered | |
6978 | a new inline function. */ | |
6979 | ||
6980 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6981 | ecs->event_thread->control.step_frame_id) |
00431a78 | 6982 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 6983 | { |
1eb8556f | 6984 | infrun_debug_printf ("stepped into inlined function"); |
edb3359d | 6985 | |
51abb421 | 6986 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 6987 | |
16c381f0 | 6988 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
6989 | { |
6990 | /* For "step", we're going to stop. But if the call site | |
6991 | for this inlined function is on the same source line as | |
6992 | we were previously stepping, go down into the function | |
6993 | first. Otherwise stop at the call site. */ | |
6994 | ||
6995 | if (call_sal.line == ecs->event_thread->current_line | |
6996 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
6997 | { |
6998 | step_into_inline_frame (ecs->event_thread); | |
6999 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7000 | { | |
7001 | keep_going (ecs); | |
7002 | return; | |
7003 | } | |
7004 | } | |
edb3359d | 7005 | |
bdc36728 | 7006 | end_stepping_range (ecs); |
edb3359d DJ |
7007 | return; |
7008 | } | |
7009 | else | |
7010 | { | |
7011 | /* For "next", we should stop at the call site if it is on a | |
7012 | different source line. Otherwise continue through the | |
7013 | inlined function. */ | |
7014 | if (call_sal.line == ecs->event_thread->current_line | |
7015 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7016 | keep_going (ecs); | |
7017 | else | |
bdc36728 | 7018 | end_stepping_range (ecs); |
edb3359d DJ |
7019 | return; |
7020 | } | |
7021 | } | |
7022 | ||
7023 | /* Look for "calls" to inlined functions, part two. If we are still | |
7024 | in the same real function we were stepping through, but we have | |
7025 | to go further up to find the exact frame ID, we are stepping | |
7026 | through a more inlined call beyond its call site. */ | |
7027 | ||
7028 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
7029 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7030 | ecs->event_thread->control.step_frame_id) |
edb3359d | 7031 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7032 | ecs->event_thread->control.step_frame_id)) |
edb3359d | 7033 | { |
1eb8556f | 7034 | infrun_debug_printf ("stepping through inlined function"); |
edb3359d | 7035 | |
4a4c04f1 BE |
7036 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7037 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7038 | keep_going (ecs); |
7039 | else | |
bdc36728 | 7040 | end_stepping_range (ecs); |
edb3359d DJ |
7041 | return; |
7042 | } | |
7043 | ||
8c95582d | 7044 | bool refresh_step_info = true; |
f2ffa92b | 7045 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
7046 | && (ecs->event_thread->current_line != stop_pc_sal.line |
7047 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b | 7048 | { |
ebde6f2d TV |
7049 | /* We are at a different line. */ |
7050 | ||
8c95582d AB |
7051 | if (stop_pc_sal.is_stmt) |
7052 | { | |
ebde6f2d TV |
7053 | /* We are at the start of a statement. |
7054 | ||
7055 | So stop. Note that we don't stop if we step into the middle of a | |
7056 | statement. That is said to make things like for (;;) statements | |
7057 | work better. */ | |
1eb8556f | 7058 | infrun_debug_printf ("stepped to a different line"); |
8c95582d AB |
7059 | end_stepping_range (ecs); |
7060 | return; | |
7061 | } | |
7062 | else if (frame_id_eq (get_frame_id (get_current_frame ()), | |
ebde6f2d | 7063 | ecs->event_thread->control.step_frame_id)) |
8c95582d | 7064 | { |
ebde6f2d TV |
7065 | /* We are not at the start of a statement, and we have not changed |
7066 | frame. | |
7067 | ||
7068 | We ignore this line table entry, and continue stepping forward, | |
8c95582d AB |
7069 | looking for a better place to stop. */ |
7070 | refresh_step_info = false; | |
1eb8556f SM |
7071 | infrun_debug_printf ("stepped to a different line, but " |
7072 | "it's not the start of a statement"); | |
8c95582d | 7073 | } |
ebde6f2d TV |
7074 | else |
7075 | { | |
7076 | /* We are not the start of a statement, and we have changed frame. | |
7077 | ||
7078 | We ignore this line table entry, and continue stepping forward, | |
7079 | looking for a better place to stop. Keep refresh_step_info at | |
7080 | true to note that the frame has changed, but ignore the line | |
7081 | number to make sure we don't ignore a subsequent entry with the | |
7082 | same line number. */ | |
7083 | stop_pc_sal.line = 0; | |
7084 | infrun_debug_printf ("stepped to a different frame, but " | |
7085 | "it's not the start of a statement"); | |
7086 | } | |
488f131b | 7087 | } |
c906108c | 7088 | |
488f131b | 7089 | /* We aren't done stepping. |
c906108c | 7090 | |
488f131b JB |
7091 | Optimize by setting the stepping range to the line. |
7092 | (We might not be in the original line, but if we entered a | |
7093 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7094 | things like for(;;) statements work better.) |
7095 | ||
7096 | If we entered a SAL that indicates a non-statement line table entry, | |
7097 | then we update the stepping range, but we don't update the step info, | |
7098 | which includes things like the line number we are stepping away from. | |
7099 | This means we will stop when we find a line table entry that is marked | |
7100 | as is-statement, even if it matches the non-statement one we just | |
7101 | stepped into. */ | |
c906108c | 7102 | |
16c381f0 JK |
7103 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7104 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7105 | ecs->event_thread->control.may_range_step = 1; |
8c95582d AB |
7106 | if (refresh_step_info) |
7107 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7108 | |
1eb8556f | 7109 | infrun_debug_printf ("keep going"); |
488f131b | 7110 | keep_going (ecs); |
104c1213 JM |
7111 | } |
7112 | ||
c447ac0b PA |
7113 | /* In all-stop mode, if we're currently stepping but have stopped in |
7114 | some other thread, we may need to switch back to the stepped | |
7115 | thread. Returns true we set the inferior running, false if we left | |
7116 | it stopped (and the event needs further processing). */ | |
7117 | ||
c4464ade | 7118 | static bool |
c447ac0b PA |
7119 | switch_back_to_stepped_thread (struct execution_control_state *ecs) |
7120 | { | |
fbea99ea | 7121 | if (!target_is_non_stop_p ()) |
c447ac0b | 7122 | { |
99619bea PA |
7123 | struct thread_info *stepping_thread; |
7124 | ||
7125 | /* If any thread is blocked on some internal breakpoint, and we | |
7126 | simply need to step over that breakpoint to get it going | |
7127 | again, do that first. */ | |
7128 | ||
7129 | /* However, if we see an event for the stepping thread, then we | |
7130 | know all other threads have been moved past their breakpoints | |
7131 | already. Let the caller check whether the step is finished, | |
7132 | etc., before deciding to move it past a breakpoint. */ | |
7133 | if (ecs->event_thread->control.step_range_end != 0) | |
c4464ade | 7134 | return false; |
99619bea PA |
7135 | |
7136 | /* Check if the current thread is blocked on an incomplete | |
7137 | step-over, interrupted by a random signal. */ | |
7138 | if (ecs->event_thread->control.trap_expected | |
7139 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7140 | { |
1eb8556f SM |
7141 | infrun_debug_printf |
7142 | ("need to finish step-over of [%s]", | |
7143 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
99619bea | 7144 | keep_going (ecs); |
c4464ade | 7145 | return true; |
99619bea | 7146 | } |
2adfaa28 | 7147 | |
99619bea PA |
7148 | /* Check if the current thread is blocked by a single-step |
7149 | breakpoint of another thread. */ | |
7150 | if (ecs->hit_singlestep_breakpoint) | |
7151 | { | |
1eb8556f SM |
7152 | infrun_debug_printf ("need to step [%s] over single-step breakpoint", |
7153 | target_pid_to_str (ecs->ptid).c_str ()); | |
99619bea | 7154 | keep_going (ecs); |
c4464ade | 7155 | return true; |
99619bea PA |
7156 | } |
7157 | ||
4d9d9d04 PA |
7158 | /* If this thread needs yet another step-over (e.g., stepping |
7159 | through a delay slot), do it first before moving on to | |
7160 | another thread. */ | |
7161 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7162 | { | |
1eb8556f SM |
7163 | infrun_debug_printf |
7164 | ("thread [%s] still needs step-over", | |
7165 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
4d9d9d04 | 7166 | keep_going (ecs); |
c4464ade | 7167 | return true; |
4d9d9d04 | 7168 | } |
70509625 | 7169 | |
483805cf PA |
7170 | /* If scheduler locking applies even if not stepping, there's no |
7171 | need to walk over threads. Above we've checked whether the | |
7172 | current thread is stepping. If some other thread not the | |
7173 | event thread is stepping, then it must be that scheduler | |
7174 | locking is not in effect. */ | |
856e7dd6 | 7175 | if (schedlock_applies (ecs->event_thread)) |
c4464ade | 7176 | return false; |
483805cf | 7177 | |
4d9d9d04 PA |
7178 | /* Otherwise, we no longer expect a trap in the current thread. |
7179 | Clear the trap_expected flag before switching back -- this is | |
7180 | what keep_going does as well, if we call it. */ | |
7181 | ecs->event_thread->control.trap_expected = 0; | |
7182 | ||
7183 | /* Likewise, clear the signal if it should not be passed. */ | |
7184 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7185 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7186 | ||
7187 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 7188 | step/next/etc. */ |
4d9d9d04 PA |
7189 | if (start_step_over ()) |
7190 | { | |
7191 | prepare_to_wait (ecs); | |
c4464ade | 7192 | return true; |
4d9d9d04 PA |
7193 | } |
7194 | ||
7195 | /* Look for the stepping/nexting thread. */ | |
483805cf | 7196 | stepping_thread = NULL; |
4d9d9d04 | 7197 | |
08036331 | 7198 | for (thread_info *tp : all_non_exited_threads ()) |
dda83cd7 | 7199 | { |
f3f8ece4 PA |
7200 | switch_to_thread_no_regs (tp); |
7201 | ||
fbea99ea PA |
7202 | /* Ignore threads of processes the caller is not |
7203 | resuming. */ | |
483805cf | 7204 | if (!sched_multi |
5b6d1e4f PA |
7205 | && (tp->inf->process_target () != ecs->target |
7206 | || tp->inf->pid != ecs->ptid.pid ())) | |
483805cf PA |
7207 | continue; |
7208 | ||
7209 | /* When stepping over a breakpoint, we lock all threads | |
7210 | except the one that needs to move past the breakpoint. | |
7211 | If a non-event thread has this set, the "incomplete | |
7212 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
7213 | if (tp->control.trap_expected) |
7214 | { | |
7215 | internal_error (__FILE__, __LINE__, | |
7216 | "[%s] has inconsistent state: " | |
7217 | "trap_expected=%d\n", | |
a068643d | 7218 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
7219 | tp->control.trap_expected); |
7220 | } | |
483805cf PA |
7221 | |
7222 | /* Did we find the stepping thread? */ | |
7223 | if (tp->control.step_range_end) | |
7224 | { | |
7225 | /* Yep. There should only one though. */ | |
7226 | gdb_assert (stepping_thread == NULL); | |
7227 | ||
7228 | /* The event thread is handled at the top, before we | |
7229 | enter this loop. */ | |
7230 | gdb_assert (tp != ecs->event_thread); | |
7231 | ||
7232 | /* If some thread other than the event thread is | |
7233 | stepping, then scheduler locking can't be in effect, | |
7234 | otherwise we wouldn't have resumed the current event | |
7235 | thread in the first place. */ | |
856e7dd6 | 7236 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
7237 | |
7238 | stepping_thread = tp; | |
7239 | } | |
99619bea PA |
7240 | } |
7241 | ||
483805cf | 7242 | if (stepping_thread != NULL) |
99619bea | 7243 | { |
1eb8556f | 7244 | infrun_debug_printf ("switching back to stepped thread"); |
c447ac0b | 7245 | |
2ac7589c PA |
7246 | if (keep_going_stepped_thread (stepping_thread)) |
7247 | { | |
7248 | prepare_to_wait (ecs); | |
c4464ade | 7249 | return true; |
2ac7589c PA |
7250 | } |
7251 | } | |
f3f8ece4 PA |
7252 | |
7253 | switch_to_thread (ecs->event_thread); | |
2ac7589c | 7254 | } |
2adfaa28 | 7255 | |
c4464ade | 7256 | return false; |
2ac7589c | 7257 | } |
2adfaa28 | 7258 | |
2ac7589c PA |
7259 | /* Set a previously stepped thread back to stepping. Returns true on |
7260 | success, false if the resume is not possible (e.g., the thread | |
7261 | vanished). */ | |
7262 | ||
c4464ade | 7263 | static bool |
2ac7589c PA |
7264 | keep_going_stepped_thread (struct thread_info *tp) |
7265 | { | |
7266 | struct frame_info *frame; | |
2ac7589c PA |
7267 | struct execution_control_state ecss; |
7268 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7269 | |
2ac7589c PA |
7270 | /* If the stepping thread exited, then don't try to switch back and |
7271 | resume it, which could fail in several different ways depending | |
7272 | on the target. Instead, just keep going. | |
2adfaa28 | 7273 | |
2ac7589c PA |
7274 | We can find a stepping dead thread in the thread list in two |
7275 | cases: | |
2adfaa28 | 7276 | |
2ac7589c PA |
7277 | - The target supports thread exit events, and when the target |
7278 | tries to delete the thread from the thread list, inferior_ptid | |
7279 | pointed at the exiting thread. In such case, calling | |
7280 | delete_thread does not really remove the thread from the list; | |
7281 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7282 | |
2ac7589c PA |
7283 | - The target's debug interface does not support thread exit |
7284 | events, and so we have no idea whatsoever if the previously | |
7285 | stepping thread is still alive. For that reason, we need to | |
7286 | synchronously query the target now. */ | |
2adfaa28 | 7287 | |
00431a78 | 7288 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c | 7289 | { |
1eb8556f SM |
7290 | infrun_debug_printf ("not resuming previously stepped thread, it has " |
7291 | "vanished"); | |
2ac7589c | 7292 | |
00431a78 | 7293 | delete_thread (tp); |
c4464ade | 7294 | return false; |
c447ac0b | 7295 | } |
2ac7589c | 7296 | |
1eb8556f | 7297 | infrun_debug_printf ("resuming previously stepped thread"); |
2ac7589c PA |
7298 | |
7299 | reset_ecs (ecs, tp); | |
00431a78 | 7300 | switch_to_thread (tp); |
2ac7589c | 7301 | |
f2ffa92b | 7302 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 7303 | frame = get_current_frame (); |
2ac7589c PA |
7304 | |
7305 | /* If the PC of the thread we were trying to single-step has | |
7306 | changed, then that thread has trapped or been signaled, but the | |
7307 | event has not been reported to GDB yet. Re-poll the target | |
7308 | looking for this particular thread's event (i.e. temporarily | |
7309 | enable schedlock) by: | |
7310 | ||
7311 | - setting a break at the current PC | |
7312 | - resuming that particular thread, only (by setting trap | |
7313 | expected) | |
7314 | ||
7315 | This prevents us continuously moving the single-step breakpoint | |
7316 | forward, one instruction at a time, overstepping. */ | |
7317 | ||
f2ffa92b | 7318 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
7319 | { |
7320 | ptid_t resume_ptid; | |
7321 | ||
1eb8556f SM |
7322 | infrun_debug_printf ("expected thread advanced also (%s -> %s)", |
7323 | paddress (target_gdbarch (), tp->prev_pc), | |
7324 | paddress (target_gdbarch (), tp->suspend.stop_pc)); | |
2ac7589c PA |
7325 | |
7326 | /* Clear the info of the previous step-over, as it's no longer | |
7327 | valid (if the thread was trying to step over a breakpoint, it | |
7328 | has already succeeded). It's what keep_going would do too, | |
7329 | if we called it. Do this before trying to insert the sss | |
7330 | breakpoint, otherwise if we were previously trying to step | |
7331 | over this exact address in another thread, the breakpoint is | |
7332 | skipped. */ | |
7333 | clear_step_over_info (); | |
7334 | tp->control.trap_expected = 0; | |
7335 | ||
7336 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7337 | get_frame_address_space (frame), | |
f2ffa92b | 7338 | tp->suspend.stop_pc); |
2ac7589c | 7339 | |
719546c4 | 7340 | tp->resumed = true; |
fbea99ea | 7341 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
c4464ade | 7342 | do_target_resume (resume_ptid, false, GDB_SIGNAL_0); |
2ac7589c PA |
7343 | } |
7344 | else | |
7345 | { | |
1eb8556f | 7346 | infrun_debug_printf ("expected thread still hasn't advanced"); |
2ac7589c PA |
7347 | |
7348 | keep_going_pass_signal (ecs); | |
7349 | } | |
c4464ade SM |
7350 | |
7351 | return true; | |
c447ac0b PA |
7352 | } |
7353 | ||
8b061563 PA |
7354 | /* Is thread TP in the middle of (software or hardware) |
7355 | single-stepping? (Note the result of this function must never be | |
7356 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7357 | |
c4464ade | 7358 | static bool |
b3444185 | 7359 | currently_stepping (struct thread_info *tp) |
a7212384 | 7360 | { |
8358c15c JK |
7361 | return ((tp->control.step_range_end |
7362 | && tp->control.step_resume_breakpoint == NULL) | |
7363 | || tp->control.trap_expected | |
af48d08f | 7364 | || tp->stepped_breakpoint |
8358c15c | 7365 | || bpstat_should_step ()); |
a7212384 UW |
7366 | } |
7367 | ||
b2175913 MS |
7368 | /* Inferior has stepped into a subroutine call with source code that |
7369 | we should not step over. Do step to the first line of code in | |
7370 | it. */ | |
c2c6d25f JM |
7371 | |
7372 | static void | |
568d6575 UW |
7373 | handle_step_into_function (struct gdbarch *gdbarch, |
7374 | struct execution_control_state *ecs) | |
c2c6d25f | 7375 | { |
7e324e48 GB |
7376 | fill_in_stop_func (gdbarch, ecs); |
7377 | ||
f2ffa92b PA |
7378 | compunit_symtab *cust |
7379 | = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); | |
43f3e411 | 7380 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7381 | ecs->stop_func_start |
7382 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7383 | |
51abb421 | 7384 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7385 | /* Use the step_resume_break to step until the end of the prologue, |
7386 | even if that involves jumps (as it seems to on the vax under | |
7387 | 4.2). */ | |
7388 | /* If the prologue ends in the middle of a source line, continue to | |
7389 | the end of that source line (if it is still within the function). | |
7390 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7391 | if (stop_func_sal.end |
7392 | && stop_func_sal.pc != ecs->stop_func_start | |
7393 | && stop_func_sal.end < ecs->stop_func_end) | |
7394 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7395 | |
2dbd5e30 KB |
7396 | /* Architectures which require breakpoint adjustment might not be able |
7397 | to place a breakpoint at the computed address. If so, the test | |
7398 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7399 | ecs->stop_func_start to an address at which a breakpoint may be | |
7400 | legitimately placed. | |
8fb3e588 | 7401 | |
2dbd5e30 KB |
7402 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7403 | made, GDB will enter an infinite loop when stepping through | |
7404 | optimized code consisting of VLIW instructions which contain | |
7405 | subinstructions corresponding to different source lines. On | |
7406 | FR-V, it's not permitted to place a breakpoint on any but the | |
7407 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7408 | set, GDB will adjust the breakpoint address to the beginning of | |
7409 | the VLIW instruction. Thus, we need to make the corresponding | |
7410 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7411 | |
568d6575 | 7412 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7413 | { |
7414 | ecs->stop_func_start | |
568d6575 | 7415 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7416 | ecs->stop_func_start); |
2dbd5e30 KB |
7417 | } |
7418 | ||
f2ffa92b | 7419 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7420 | { |
7421 | /* We are already there: stop now. */ | |
bdc36728 | 7422 | end_stepping_range (ecs); |
c2c6d25f JM |
7423 | return; |
7424 | } | |
7425 | else | |
7426 | { | |
7427 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7428 | symtab_and_line sr_sal; |
c2c6d25f JM |
7429 | sr_sal.pc = ecs->stop_func_start; |
7430 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7431 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7432 | |
c2c6d25f | 7433 | /* Do not specify what the fp should be when we stop since on |
dda83cd7 SM |
7434 | some machines the prologue is where the new fp value is |
7435 | established. */ | |
a6d9a66e | 7436 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7437 | |
7438 | /* And make sure stepping stops right away then. */ | |
16c381f0 | 7439 | ecs->event_thread->control.step_range_end |
dda83cd7 | 7440 | = ecs->event_thread->control.step_range_start; |
c2c6d25f JM |
7441 | } |
7442 | keep_going (ecs); | |
7443 | } | |
d4f3574e | 7444 | |
b2175913 MS |
7445 | /* Inferior has stepped backward into a subroutine call with source |
7446 | code that we should not step over. Do step to the beginning of the | |
7447 | last line of code in it. */ | |
7448 | ||
7449 | static void | |
568d6575 UW |
7450 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7451 | struct execution_control_state *ecs) | |
b2175913 | 7452 | { |
43f3e411 | 7453 | struct compunit_symtab *cust; |
167e4384 | 7454 | struct symtab_and_line stop_func_sal; |
b2175913 | 7455 | |
7e324e48 GB |
7456 | fill_in_stop_func (gdbarch, ecs); |
7457 | ||
f2ffa92b | 7458 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7459 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7460 | ecs->stop_func_start |
7461 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7462 | |
f2ffa92b | 7463 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7464 | |
7465 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7466 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7467 | { |
7468 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7469 | end_stepping_range (ecs); |
b2175913 MS |
7470 | } |
7471 | else | |
7472 | { | |
7473 | /* Else just reset the step range and keep going. | |
7474 | No step-resume breakpoint, they don't work for | |
7475 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7476 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7477 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7478 | keep_going (ecs); |
7479 | } | |
7480 | return; | |
7481 | } | |
7482 | ||
d3169d93 | 7483 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7484 | This is used to both functions and to skip over code. */ |
7485 | ||
7486 | static void | |
2c03e5be PA |
7487 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7488 | struct symtab_and_line sr_sal, | |
7489 | struct frame_id sr_id, | |
7490 | enum bptype sr_type) | |
44cbf7b5 | 7491 | { |
611c83ae PA |
7492 | /* There should never be more than one step-resume or longjmp-resume |
7493 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7494 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7495 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7496 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 | 7497 | |
1eb8556f SM |
7498 | infrun_debug_printf ("inserting step-resume breakpoint at %s", |
7499 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7500 | |
8358c15c | 7501 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7502 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7503 | } |
7504 | ||
9da8c2a0 | 7505 | void |
2c03e5be PA |
7506 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7507 | struct symtab_and_line sr_sal, | |
7508 | struct frame_id sr_id) | |
7509 | { | |
7510 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7511 | sr_sal, sr_id, | |
7512 | bp_step_resume); | |
44cbf7b5 | 7513 | } |
7ce450bd | 7514 | |
2c03e5be PA |
7515 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7516 | This is used to skip a potential signal handler. | |
7ce450bd | 7517 | |
14e60db5 DJ |
7518 | This is called with the interrupted function's frame. The signal |
7519 | handler, when it returns, will resume the interrupted function at | |
7520 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7521 | |
7522 | static void | |
2c03e5be | 7523 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7524 | { |
f4c1edd8 | 7525 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7526 | |
51abb421 PA |
7527 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7528 | ||
7529 | symtab_and_line sr_sal; | |
568d6575 | 7530 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7531 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7532 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7533 | |
2c03e5be PA |
7534 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7535 | get_stack_frame_id (return_frame), | |
7536 | bp_hp_step_resume); | |
d303a6c7 AC |
7537 | } |
7538 | ||
2c03e5be PA |
7539 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7540 | is used to skip a function after stepping into it (for "next" or if | |
7541 | the called function has no debugging information). | |
14e60db5 DJ |
7542 | |
7543 | The current function has almost always been reached by single | |
7544 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7545 | current function, and the breakpoint will be set at the caller's | |
7546 | resume address. | |
7547 | ||
7548 | This is a separate function rather than reusing | |
2c03e5be | 7549 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7550 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7551 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7552 | |
7553 | static void | |
7554 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7555 | { | |
14e60db5 DJ |
7556 | /* We shouldn't have gotten here if we don't know where the call site |
7557 | is. */ | |
c7ce8faa | 7558 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7559 | |
51abb421 | 7560 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7561 | |
51abb421 | 7562 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7563 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7564 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7565 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7566 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7567 | |
a6d9a66e | 7568 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7569 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7570 | } |
7571 | ||
611c83ae PA |
7572 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7573 | new breakpoint at the target of a jmp_buf. The handling of | |
7574 | longjmp-resume uses the same mechanisms used for handling | |
7575 | "step-resume" breakpoints. */ | |
7576 | ||
7577 | static void | |
a6d9a66e | 7578 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7579 | { |
e81a37f7 TT |
7580 | /* There should never be more than one longjmp-resume breakpoint per |
7581 | thread, so we should never be setting a new | |
611c83ae | 7582 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7583 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae | 7584 | |
1eb8556f SM |
7585 | infrun_debug_printf ("inserting longjmp-resume breakpoint at %s", |
7586 | paddress (gdbarch, pc)); | |
611c83ae | 7587 | |
e81a37f7 | 7588 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7589 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7590 | } |
7591 | ||
186c406b TT |
7592 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7593 | the exception. The block B is the block of the unwinder debug hook | |
7594 | function. FRAME is the frame corresponding to the call to this | |
7595 | function. SYM is the symbol of the function argument holding the | |
7596 | target PC of the exception. */ | |
7597 | ||
7598 | static void | |
7599 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7600 | const struct block *b, |
186c406b TT |
7601 | struct frame_info *frame, |
7602 | struct symbol *sym) | |
7603 | { | |
a70b8144 | 7604 | try |
186c406b | 7605 | { |
63e43d3a | 7606 | struct block_symbol vsym; |
186c406b TT |
7607 | struct value *value; |
7608 | CORE_ADDR handler; | |
7609 | struct breakpoint *bp; | |
7610 | ||
987012b8 | 7611 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 7612 | b, VAR_DOMAIN); |
63e43d3a | 7613 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7614 | /* If the value was optimized out, revert to the old behavior. */ |
7615 | if (! value_optimized_out (value)) | |
7616 | { | |
7617 | handler = value_as_address (value); | |
7618 | ||
1eb8556f SM |
7619 | infrun_debug_printf ("exception resume at %lx", |
7620 | (unsigned long) handler); | |
186c406b TT |
7621 | |
7622 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7623 | handler, |
7624 | bp_exception_resume).release (); | |
c70a6932 JK |
7625 | |
7626 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7627 | frame = NULL; | |
7628 | ||
5d5658a1 | 7629 | bp->thread = tp->global_num; |
186c406b TT |
7630 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7631 | } | |
7632 | } | |
230d2906 | 7633 | catch (const gdb_exception_error &e) |
492d29ea PA |
7634 | { |
7635 | /* We want to ignore errors here. */ | |
7636 | } | |
186c406b TT |
7637 | } |
7638 | ||
28106bc2 SDJ |
7639 | /* A helper for check_exception_resume that sets an |
7640 | exception-breakpoint based on a SystemTap probe. */ | |
7641 | ||
7642 | static void | |
7643 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7644 | const struct bound_probe *probe, |
28106bc2 SDJ |
7645 | struct frame_info *frame) |
7646 | { | |
7647 | struct value *arg_value; | |
7648 | CORE_ADDR handler; | |
7649 | struct breakpoint *bp; | |
7650 | ||
7651 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7652 | if (!arg_value) | |
7653 | return; | |
7654 | ||
7655 | handler = value_as_address (arg_value); | |
7656 | ||
1eb8556f SM |
7657 | infrun_debug_printf ("exception resume at %s", |
7658 | paddress (probe->objfile->arch (), handler)); | |
28106bc2 SDJ |
7659 | |
7660 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7661 | handler, bp_exception_resume).release (); |
5d5658a1 | 7662 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7663 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7664 | } | |
7665 | ||
186c406b TT |
7666 | /* This is called when an exception has been intercepted. Check to |
7667 | see whether the exception's destination is of interest, and if so, | |
7668 | set an exception resume breakpoint there. */ | |
7669 | ||
7670 | static void | |
7671 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7672 | struct frame_info *frame) |
186c406b | 7673 | { |
729662a5 | 7674 | struct bound_probe probe; |
28106bc2 SDJ |
7675 | struct symbol *func; |
7676 | ||
7677 | /* First see if this exception unwinding breakpoint was set via a | |
7678 | SystemTap probe point. If so, the probe has two arguments: the | |
7679 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7680 | set a breakpoint there. */ | |
6bac7473 | 7681 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7682 | if (probe.prob) |
28106bc2 | 7683 | { |
729662a5 | 7684 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7685 | return; |
7686 | } | |
7687 | ||
7688 | func = get_frame_function (frame); | |
7689 | if (!func) | |
7690 | return; | |
186c406b | 7691 | |
a70b8144 | 7692 | try |
186c406b | 7693 | { |
3977b71f | 7694 | const struct block *b; |
8157b174 | 7695 | struct block_iterator iter; |
186c406b TT |
7696 | struct symbol *sym; |
7697 | int argno = 0; | |
7698 | ||
7699 | /* The exception breakpoint is a thread-specific breakpoint on | |
7700 | the unwinder's debug hook, declared as: | |
7701 | ||
7702 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7703 | ||
7704 | The CFA argument indicates the frame to which control is | |
7705 | about to be transferred. HANDLER is the destination PC. | |
7706 | ||
7707 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7708 | This is not extremely efficient but it avoids issues in gdb | |
7709 | with computing the DWARF CFA, and it also works even in weird | |
7710 | cases such as throwing an exception from inside a signal | |
7711 | handler. */ | |
7712 | ||
7713 | b = SYMBOL_BLOCK_VALUE (func); | |
7714 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7715 | { | |
7716 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7717 | continue; | |
7718 | ||
7719 | if (argno == 0) | |
7720 | ++argno; | |
7721 | else | |
7722 | { | |
7723 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7724 | b, frame, sym); | |
7725 | break; | |
7726 | } | |
7727 | } | |
7728 | } | |
230d2906 | 7729 | catch (const gdb_exception_error &e) |
492d29ea PA |
7730 | { |
7731 | } | |
186c406b TT |
7732 | } |
7733 | ||
104c1213 | 7734 | static void |
22bcd14b | 7735 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7736 | { |
1eb8556f | 7737 | infrun_debug_printf ("stop_waiting"); |
527159b7 | 7738 | |
cd0fc7c3 SS |
7739 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7740 | ecs->wait_some_more = 0; | |
fbea99ea | 7741 | |
53cccef1 | 7742 | /* If all-stop, but there exists a non-stop target, stop all |
fbea99ea | 7743 | threads now that we're presenting the stop to the user. */ |
53cccef1 | 7744 | if (!non_stop && exists_non_stop_target ()) |
fbea99ea | 7745 | stop_all_threads (); |
cd0fc7c3 SS |
7746 | } |
7747 | ||
4d9d9d04 PA |
7748 | /* Like keep_going, but passes the signal to the inferior, even if the |
7749 | signal is set to nopass. */ | |
d4f3574e SS |
7750 | |
7751 | static void | |
4d9d9d04 | 7752 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7753 | { |
d7e15655 | 7754 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 7755 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7756 | |
d4f3574e | 7757 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 7758 | ecs->event_thread->prev_pc |
fc75c28b | 7759 | = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 7760 | |
4d9d9d04 | 7761 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7762 | { |
4d9d9d04 PA |
7763 | struct thread_info *tp = ecs->event_thread; |
7764 | ||
1eb8556f SM |
7765 | infrun_debug_printf ("%s has trap_expected set, " |
7766 | "resuming to collect trap", | |
7767 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 | 7768 | |
a9ba6bae PA |
7769 | /* We haven't yet gotten our trap, and either: intercepted a |
7770 | non-signal event (e.g., a fork); or took a signal which we | |
7771 | are supposed to pass through to the inferior. Simply | |
7772 | continue. */ | |
64ce06e4 | 7773 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7774 | } |
372316f1 PA |
7775 | else if (step_over_info_valid_p ()) |
7776 | { | |
7777 | /* Another thread is stepping over a breakpoint in-line. If | |
7778 | this thread needs a step-over too, queue the request. In | |
7779 | either case, this resume must be deferred for later. */ | |
7780 | struct thread_info *tp = ecs->event_thread; | |
7781 | ||
7782 | if (ecs->hit_singlestep_breakpoint | |
7783 | || thread_still_needs_step_over (tp)) | |
7784 | { | |
1eb8556f SM |
7785 | infrun_debug_printf ("step-over already in progress: " |
7786 | "step-over for %s deferred", | |
7787 | target_pid_to_str (tp->ptid).c_str ()); | |
28d5518b | 7788 | global_thread_step_over_chain_enqueue (tp); |
372316f1 PA |
7789 | } |
7790 | else | |
7791 | { | |
1eb8556f SM |
7792 | infrun_debug_printf ("step-over in progress: resume of %s deferred", |
7793 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 7794 | } |
372316f1 | 7795 | } |
d4f3574e SS |
7796 | else |
7797 | { | |
31e77af2 | 7798 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7799 | int remove_bp; |
7800 | int remove_wps; | |
8d297bbf | 7801 | step_over_what step_what; |
31e77af2 | 7802 | |
d4f3574e | 7803 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7804 | anyway (if we got a signal, the user asked it be passed to |
7805 | the child) | |
7806 | -- or -- | |
7807 | We got our expected trap, but decided we should resume from | |
7808 | it. | |
d4f3574e | 7809 | |
a9ba6bae | 7810 | We're going to run this baby now! |
d4f3574e | 7811 | |
c36b740a VP |
7812 | Note that insert_breakpoints won't try to re-insert |
7813 | already inserted breakpoints. Therefore, we don't | |
7814 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7815 | |
31e77af2 PA |
7816 | /* If we need to step over a breakpoint, and we're not using |
7817 | displaced stepping to do so, insert all breakpoints | |
7818 | (watchpoints, etc.) but the one we're stepping over, step one | |
7819 | instruction, and then re-insert the breakpoint when that step | |
7820 | is finished. */ | |
963f9c80 | 7821 | |
6c4cfb24 PA |
7822 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7823 | ||
963f9c80 | 7824 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7825 | || (step_what & STEP_OVER_BREAKPOINT)); |
7826 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7827 | |
cb71640d PA |
7828 | /* We can't use displaced stepping if we need to step past a |
7829 | watchpoint. The instruction copied to the scratch pad would | |
7830 | still trigger the watchpoint. */ | |
7831 | if (remove_bp | |
3fc8eb30 | 7832 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7833 | { |
a01bda52 | 7834 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
7835 | regcache_read_pc (regcache), remove_wps, |
7836 | ecs->event_thread->global_num); | |
45e8c884 | 7837 | } |
963f9c80 | 7838 | else if (remove_wps) |
21edc42f | 7839 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
7840 | |
7841 | /* If we now need to do an in-line step-over, we need to stop | |
7842 | all other threads. Note this must be done before | |
7843 | insert_breakpoints below, because that removes the breakpoint | |
7844 | we're about to step over, otherwise other threads could miss | |
7845 | it. */ | |
fbea99ea | 7846 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7847 | stop_all_threads (); |
abbb1732 | 7848 | |
31e77af2 | 7849 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 7850 | try |
31e77af2 PA |
7851 | { |
7852 | insert_breakpoints (); | |
7853 | } | |
230d2906 | 7854 | catch (const gdb_exception_error &e) |
31e77af2 PA |
7855 | { |
7856 | exception_print (gdb_stderr, e); | |
22bcd14b | 7857 | stop_waiting (ecs); |
bdf2a94a | 7858 | clear_step_over_info (); |
31e77af2 | 7859 | return; |
d4f3574e SS |
7860 | } |
7861 | ||
963f9c80 | 7862 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7863 | |
64ce06e4 | 7864 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7865 | } |
7866 | ||
488f131b | 7867 | prepare_to_wait (ecs); |
d4f3574e SS |
7868 | } |
7869 | ||
4d9d9d04 PA |
7870 | /* Called when we should continue running the inferior, because the |
7871 | current event doesn't cause a user visible stop. This does the | |
7872 | resuming part; waiting for the next event is done elsewhere. */ | |
7873 | ||
7874 | static void | |
7875 | keep_going (struct execution_control_state *ecs) | |
7876 | { | |
7877 | if (ecs->event_thread->control.trap_expected | |
7878 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7879 | ecs->event_thread->control.trap_expected = 0; | |
7880 | ||
7881 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7882 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7883 | keep_going_pass_signal (ecs); | |
7884 | } | |
7885 | ||
104c1213 JM |
7886 | /* This function normally comes after a resume, before |
7887 | handle_inferior_event exits. It takes care of any last bits of | |
7888 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7889 | |
104c1213 JM |
7890 | static void |
7891 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7892 | { |
1eb8556f | 7893 | infrun_debug_printf ("prepare_to_wait"); |
104c1213 | 7894 | |
104c1213 | 7895 | ecs->wait_some_more = 1; |
0b333c5e | 7896 | |
42bd97a6 PA |
7897 | /* If the target can't async, emulate it by marking the infrun event |
7898 | handler such that as soon as we get back to the event-loop, we | |
7899 | immediately end up in fetch_inferior_event again calling | |
7900 | target_wait. */ | |
7901 | if (!target_can_async_p ()) | |
0b333c5e | 7902 | mark_infrun_async_event_handler (); |
c906108c | 7903 | } |
11cf8741 | 7904 | |
fd664c91 | 7905 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7906 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7907 | |
7908 | static void | |
bdc36728 | 7909 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7910 | { |
bdc36728 | 7911 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7912 | stop_waiting (ecs); |
fd664c91 PA |
7913 | } |
7914 | ||
33d62d64 JK |
7915 | /* Several print_*_reason functions to print why the inferior has stopped. |
7916 | We always print something when the inferior exits, or receives a signal. | |
7917 | The rest of the cases are dealt with later on in normal_stop and | |
7918 | print_it_typical. Ideally there should be a call to one of these | |
7919 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7920 | stop_waiting is called. |
33d62d64 | 7921 | |
fd664c91 PA |
7922 | Note that we don't call these directly, instead we delegate that to |
7923 | the interpreters, through observers. Interpreters then call these | |
7924 | with whatever uiout is right. */ | |
33d62d64 | 7925 | |
fd664c91 PA |
7926 | void |
7927 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7928 | { |
fd664c91 | 7929 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7930 | |
112e8700 | 7931 | if (uiout->is_mi_like_p ()) |
fd664c91 | 7932 | { |
112e8700 | 7933 | uiout->field_string ("reason", |
fd664c91 PA |
7934 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
7935 | } | |
7936 | } | |
33d62d64 | 7937 | |
fd664c91 PA |
7938 | void |
7939 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7940 | { |
33d62d64 | 7941 | annotate_signalled (); |
112e8700 SM |
7942 | if (uiout->is_mi_like_p ()) |
7943 | uiout->field_string | |
7944 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7945 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 7946 | annotate_signal_name (); |
112e8700 | 7947 | uiout->field_string ("signal-name", |
2ea28649 | 7948 | gdb_signal_to_name (siggnal)); |
33d62d64 | 7949 | annotate_signal_name_end (); |
112e8700 | 7950 | uiout->text (", "); |
33d62d64 | 7951 | annotate_signal_string (); |
112e8700 | 7952 | uiout->field_string ("signal-meaning", |
2ea28649 | 7953 | gdb_signal_to_string (siggnal)); |
33d62d64 | 7954 | annotate_signal_string_end (); |
112e8700 SM |
7955 | uiout->text (".\n"); |
7956 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
7957 | } |
7958 | ||
fd664c91 PA |
7959 | void |
7960 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7961 | { |
fda326dd | 7962 | struct inferior *inf = current_inferior (); |
a068643d | 7963 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 7964 | |
33d62d64 JK |
7965 | annotate_exited (exitstatus); |
7966 | if (exitstatus) | |
7967 | { | |
112e8700 SM |
7968 | if (uiout->is_mi_like_p ()) |
7969 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
7970 | std::string exit_code_str |
7971 | = string_printf ("0%o", (unsigned int) exitstatus); | |
7972 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
7973 | plongest (inf->num), pidstr.c_str (), | |
7974 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
7975 | } |
7976 | else | |
11cf8741 | 7977 | { |
112e8700 SM |
7978 | if (uiout->is_mi_like_p ()) |
7979 | uiout->field_string | |
7980 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
7981 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
7982 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 7983 | } |
33d62d64 JK |
7984 | } |
7985 | ||
fd664c91 PA |
7986 | void |
7987 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 7988 | { |
f303dbd6 PA |
7989 | struct thread_info *thr = inferior_thread (); |
7990 | ||
33d62d64 JK |
7991 | annotate_signal (); |
7992 | ||
112e8700 | 7993 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
7994 | ; |
7995 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 7996 | { |
f303dbd6 | 7997 | const char *name; |
33d62d64 | 7998 | |
112e8700 | 7999 | uiout->text ("\nThread "); |
33eca680 | 8000 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 PA |
8001 | |
8002 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
8003 | if (name != NULL) | |
8004 | { | |
112e8700 | 8005 | uiout->text (" \""); |
33eca680 | 8006 | uiout->field_string ("name", name); |
112e8700 | 8007 | uiout->text ("\""); |
f303dbd6 | 8008 | } |
33d62d64 | 8009 | } |
f303dbd6 | 8010 | else |
112e8700 | 8011 | uiout->text ("\nProgram"); |
f303dbd6 | 8012 | |
112e8700 SM |
8013 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8014 | uiout->text (" stopped"); | |
33d62d64 JK |
8015 | else |
8016 | { | |
112e8700 | 8017 | uiout->text (" received signal "); |
8b93c638 | 8018 | annotate_signal_name (); |
112e8700 SM |
8019 | if (uiout->is_mi_like_p ()) |
8020 | uiout->field_string | |
8021 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8022 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8023 | annotate_signal_name_end (); |
112e8700 | 8024 | uiout->text (", "); |
8b93c638 | 8025 | annotate_signal_string (); |
112e8700 | 8026 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 | 8027 | |
272bb05c JB |
8028 | struct regcache *regcache = get_current_regcache (); |
8029 | struct gdbarch *gdbarch = regcache->arch (); | |
8030 | if (gdbarch_report_signal_info_p (gdbarch)) | |
8031 | gdbarch_report_signal_info (gdbarch, uiout, siggnal); | |
8032 | ||
8b93c638 | 8033 | annotate_signal_string_end (); |
33d62d64 | 8034 | } |
112e8700 | 8035 | uiout->text (".\n"); |
33d62d64 | 8036 | } |
252fbfc8 | 8037 | |
fd664c91 PA |
8038 | void |
8039 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8040 | { |
112e8700 | 8041 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8042 | } |
43ff13b4 | 8043 | |
0c7e1a46 PA |
8044 | /* Print current location without a level number, if we have changed |
8045 | functions or hit a breakpoint. Print source line if we have one. | |
8046 | bpstat_print contains the logic deciding in detail what to print, | |
8047 | based on the event(s) that just occurred. */ | |
8048 | ||
243a9253 PA |
8049 | static void |
8050 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8051 | { |
8052 | int bpstat_ret; | |
f486487f | 8053 | enum print_what source_flag; |
0c7e1a46 PA |
8054 | int do_frame_printing = 1; |
8055 | struct thread_info *tp = inferior_thread (); | |
8056 | ||
8057 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8058 | switch (bpstat_ret) | |
8059 | { | |
8060 | case PRINT_UNKNOWN: | |
8061 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8062 | should) carry around the function and does (or should) use | |
8063 | that when doing a frame comparison. */ | |
8064 | if (tp->control.stop_step | |
8065 | && frame_id_eq (tp->control.step_frame_id, | |
8066 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
8067 | && (tp->control.step_start_function |
8068 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
8069 | { |
8070 | /* Finished step, just print source line. */ | |
8071 | source_flag = SRC_LINE; | |
8072 | } | |
8073 | else | |
8074 | { | |
8075 | /* Print location and source line. */ | |
8076 | source_flag = SRC_AND_LOC; | |
8077 | } | |
8078 | break; | |
8079 | case PRINT_SRC_AND_LOC: | |
8080 | /* Print location and source line. */ | |
8081 | source_flag = SRC_AND_LOC; | |
8082 | break; | |
8083 | case PRINT_SRC_ONLY: | |
8084 | source_flag = SRC_LINE; | |
8085 | break; | |
8086 | case PRINT_NOTHING: | |
8087 | /* Something bogus. */ | |
8088 | source_flag = SRC_LINE; | |
8089 | do_frame_printing = 0; | |
8090 | break; | |
8091 | default: | |
8092 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8093 | } | |
8094 | ||
8095 | /* The behavior of this routine with respect to the source | |
8096 | flag is: | |
8097 | SRC_LINE: Print only source line | |
8098 | LOCATION: Print only location | |
8099 | SRC_AND_LOC: Print location and source line. */ | |
8100 | if (do_frame_printing) | |
8101 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8102 | } |
8103 | ||
243a9253 PA |
8104 | /* See infrun.h. */ |
8105 | ||
8106 | void | |
4c7d57e7 | 8107 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8108 | { |
243a9253 | 8109 | struct target_waitstatus last; |
243a9253 PA |
8110 | struct thread_info *tp; |
8111 | ||
5b6d1e4f | 8112 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8113 | |
67ad9399 TT |
8114 | { |
8115 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8116 | |
67ad9399 | 8117 | print_stop_location (&last); |
243a9253 | 8118 | |
67ad9399 | 8119 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8120 | if (displays) |
8121 | do_displays (); | |
67ad9399 | 8122 | } |
243a9253 PA |
8123 | |
8124 | tp = inferior_thread (); | |
8125 | if (tp->thread_fsm != NULL | |
46e3ed7f | 8126 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
8127 | { |
8128 | struct return_value_info *rv; | |
8129 | ||
46e3ed7f | 8130 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
8131 | if (rv != NULL) |
8132 | print_return_value (uiout, rv); | |
8133 | } | |
0c7e1a46 PA |
8134 | } |
8135 | ||
388a7084 PA |
8136 | /* See infrun.h. */ |
8137 | ||
8138 | void | |
8139 | maybe_remove_breakpoints (void) | |
8140 | { | |
55f6301a | 8141 | if (!breakpoints_should_be_inserted_now () && target_has_execution ()) |
388a7084 PA |
8142 | { |
8143 | if (remove_breakpoints ()) | |
8144 | { | |
223ffa71 | 8145 | target_terminal::ours_for_output (); |
388a7084 PA |
8146 | printf_filtered (_("Cannot remove breakpoints because " |
8147 | "program is no longer writable.\nFurther " | |
8148 | "execution is probably impossible.\n")); | |
8149 | } | |
8150 | } | |
8151 | } | |
8152 | ||
4c2f2a79 PA |
8153 | /* The execution context that just caused a normal stop. */ |
8154 | ||
8155 | struct stop_context | |
8156 | { | |
2d844eaf | 8157 | stop_context (); |
2d844eaf TT |
8158 | |
8159 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8160 | ||
8161 | bool changed () const; | |
8162 | ||
4c2f2a79 PA |
8163 | /* The stop ID. */ |
8164 | ULONGEST stop_id; | |
c906108c | 8165 | |
4c2f2a79 | 8166 | /* The event PTID. */ |
c906108c | 8167 | |
4c2f2a79 PA |
8168 | ptid_t ptid; |
8169 | ||
8170 | /* If stopp for a thread event, this is the thread that caused the | |
8171 | stop. */ | |
d634cd0b | 8172 | thread_info_ref thread; |
4c2f2a79 PA |
8173 | |
8174 | /* The inferior that caused the stop. */ | |
8175 | int inf_num; | |
8176 | }; | |
8177 | ||
2d844eaf | 8178 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8179 | takes a strong reference to the thread. */ |
8180 | ||
2d844eaf | 8181 | stop_context::stop_context () |
4c2f2a79 | 8182 | { |
2d844eaf TT |
8183 | stop_id = get_stop_id (); |
8184 | ptid = inferior_ptid; | |
8185 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8186 | |
d7e15655 | 8187 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8188 | { |
8189 | /* Take a strong reference so that the thread can't be deleted | |
8190 | yet. */ | |
d634cd0b | 8191 | thread = thread_info_ref::new_reference (inferior_thread ()); |
4c2f2a79 | 8192 | } |
4c2f2a79 PA |
8193 | } |
8194 | ||
8195 | /* Return true if the current context no longer matches the saved stop | |
8196 | context. */ | |
8197 | ||
2d844eaf TT |
8198 | bool |
8199 | stop_context::changed () const | |
8200 | { | |
8201 | if (ptid != inferior_ptid) | |
8202 | return true; | |
8203 | if (inf_num != current_inferior ()->num) | |
8204 | return true; | |
8205 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8206 | return true; | |
8207 | if (get_stop_id () != stop_id) | |
8208 | return true; | |
8209 | return false; | |
4c2f2a79 PA |
8210 | } |
8211 | ||
8212 | /* See infrun.h. */ | |
8213 | ||
8214 | int | |
96baa820 | 8215 | normal_stop (void) |
c906108c | 8216 | { |
73b65bb0 | 8217 | struct target_waitstatus last; |
73b65bb0 | 8218 | |
5b6d1e4f | 8219 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8220 | |
4c2f2a79 PA |
8221 | new_stop_id (); |
8222 | ||
29f49a6a PA |
8223 | /* If an exception is thrown from this point on, make sure to |
8224 | propagate GDB's knowledge of the executing state to the | |
8225 | frontend/user running state. A QUIT is an easy exception to see | |
8226 | here, so do this before any filtered output. */ | |
731f534f | 8227 | |
5b6d1e4f | 8228 | ptid_t finish_ptid = null_ptid; |
731f534f | 8229 | |
c35b1492 | 8230 | if (!non_stop) |
5b6d1e4f | 8231 | finish_ptid = minus_one_ptid; |
e1316e60 PA |
8232 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8233 | || last.kind == TARGET_WAITKIND_EXITED) | |
8234 | { | |
8235 | /* On some targets, we may still have live threads in the | |
8236 | inferior when we get a process exit event. E.g., for | |
8237 | "checkpoint", when the current checkpoint/fork exits, | |
8238 | linux-fork.c automatically switches to another fork from | |
8239 | within target_mourn_inferior. */ | |
731f534f | 8240 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8241 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 PA |
8242 | } |
8243 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5b6d1e4f PA |
8244 | finish_ptid = inferior_ptid; |
8245 | ||
8246 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8247 | if (finish_ptid != null_ptid) | |
8248 | { | |
8249 | maybe_finish_thread_state.emplace | |
8250 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8251 | } | |
29f49a6a | 8252 | |
b57bacec PA |
8253 | /* As we're presenting a stop, and potentially removing breakpoints, |
8254 | update the thread list so we can tell whether there are threads | |
8255 | running on the target. With target remote, for example, we can | |
8256 | only learn about new threads when we explicitly update the thread | |
8257 | list. Do this before notifying the interpreters about signal | |
8258 | stops, end of stepping ranges, etc., so that the "new thread" | |
8259 | output is emitted before e.g., "Program received signal FOO", | |
8260 | instead of after. */ | |
8261 | update_thread_list (); | |
8262 | ||
8263 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 8264 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 8265 | |
c906108c SS |
8266 | /* As with the notification of thread events, we want to delay |
8267 | notifying the user that we've switched thread context until | |
8268 | the inferior actually stops. | |
8269 | ||
73b65bb0 DJ |
8270 | There's no point in saying anything if the inferior has exited. |
8271 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8272 | "received a signal". |
8273 | ||
8274 | Also skip saying anything in non-stop mode. In that mode, as we | |
8275 | don't want GDB to switch threads behind the user's back, to avoid | |
8276 | races where the user is typing a command to apply to thread x, | |
8277 | but GDB switches to thread y before the user finishes entering | |
8278 | the command, fetch_inferior_event installs a cleanup to restore | |
8279 | the current thread back to the thread the user had selected right | |
8280 | after this event is handled, so we're not really switching, only | |
8281 | informing of a stop. */ | |
4f8d22e3 | 8282 | if (!non_stop |
731f534f | 8283 | && previous_inferior_ptid != inferior_ptid |
55f6301a | 8284 | && target_has_execution () |
73b65bb0 | 8285 | && last.kind != TARGET_WAITKIND_SIGNALLED |
0e5bf2a8 PA |
8286 | && last.kind != TARGET_WAITKIND_EXITED |
8287 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8288 | { |
0e454242 | 8289 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8290 | { |
223ffa71 | 8291 | target_terminal::ours_for_output (); |
3b12939d | 8292 | printf_filtered (_("[Switching to %s]\n"), |
a068643d | 8293 | target_pid_to_str (inferior_ptid).c_str ()); |
3b12939d PA |
8294 | annotate_thread_changed (); |
8295 | } | |
39f77062 | 8296 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8297 | } |
c906108c | 8298 | |
0e5bf2a8 PA |
8299 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8300 | { | |
0e454242 | 8301 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8302 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8303 | { | |
223ffa71 | 8304 | target_terminal::ours_for_output (); |
3b12939d PA |
8305 | printf_filtered (_("No unwaited-for children left.\n")); |
8306 | } | |
0e5bf2a8 PA |
8307 | } |
8308 | ||
b57bacec | 8309 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8310 | maybe_remove_breakpoints (); |
c906108c | 8311 | |
c906108c SS |
8312 | /* If an auto-display called a function and that got a signal, |
8313 | delete that auto-display to avoid an infinite recursion. */ | |
8314 | ||
8315 | if (stopped_by_random_signal) | |
8316 | disable_current_display (); | |
8317 | ||
0e454242 | 8318 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8319 | { |
8320 | async_enable_stdin (); | |
8321 | } | |
c906108c | 8322 | |
388a7084 | 8323 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8324 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8325 | |
8326 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8327 | and current location is based on that. Handle the case where the | |
8328 | dummy call is returning after being stopped. E.g. the dummy call | |
8329 | previously hit a breakpoint. (If the dummy call returns | |
8330 | normally, we won't reach here.) Do this before the stop hook is | |
8331 | run, so that it doesn't get to see the temporary dummy frame, | |
8332 | which is not where we'll present the stop. */ | |
8333 | if (has_stack_frames ()) | |
8334 | { | |
8335 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8336 | { | |
8337 | /* Pop the empty frame that contains the stack dummy. This | |
8338 | also restores inferior state prior to the call (struct | |
8339 | infcall_suspend_state). */ | |
8340 | struct frame_info *frame = get_current_frame (); | |
8341 | ||
8342 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8343 | frame_pop (frame); | |
8344 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8345 | does which means there's now no selected frame. */ | |
8346 | } | |
8347 | ||
8348 | select_frame (get_current_frame ()); | |
8349 | ||
8350 | /* Set the current source location. */ | |
8351 | set_current_sal_from_frame (get_current_frame ()); | |
8352 | } | |
dd7e2d2b PA |
8353 | |
8354 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8355 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8356 | if (stop_command != NULL) |
8357 | { | |
2d844eaf | 8358 | stop_context saved_context; |
4c2f2a79 | 8359 | |
a70b8144 | 8360 | try |
bf469271 PA |
8361 | { |
8362 | execute_cmd_pre_hook (stop_command); | |
8363 | } | |
230d2906 | 8364 | catch (const gdb_exception &ex) |
bf469271 PA |
8365 | { |
8366 | exception_fprintf (gdb_stderr, ex, | |
8367 | "Error while running hook_stop:\n"); | |
8368 | } | |
4c2f2a79 PA |
8369 | |
8370 | /* If the stop hook resumes the target, then there's no point in | |
8371 | trying to notify about the previous stop; its context is | |
8372 | gone. Likewise if the command switches thread or inferior -- | |
8373 | the observers would print a stop for the wrong | |
8374 | thread/inferior. */ | |
2d844eaf TT |
8375 | if (saved_context.changed ()) |
8376 | return 1; | |
4c2f2a79 | 8377 | } |
dd7e2d2b | 8378 | |
388a7084 PA |
8379 | /* Notify observers about the stop. This is where the interpreters |
8380 | print the stop event. */ | |
d7e15655 | 8381 | if (inferior_ptid != null_ptid) |
76727919 | 8382 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
24a7f1b5 | 8383 | stop_print_frame); |
388a7084 | 8384 | else |
76727919 | 8385 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8386 | |
243a9253 PA |
8387 | annotate_stopped (); |
8388 | ||
55f6301a | 8389 | if (target_has_execution ()) |
48844aa6 PA |
8390 | { |
8391 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
fe726667 PA |
8392 | && last.kind != TARGET_WAITKIND_EXITED |
8393 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8394 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8395 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8396 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8397 | } |
6c95b8df PA |
8398 | |
8399 | /* Try to get rid of automatically added inferiors that are no | |
8400 | longer needed. Keeping those around slows down things linearly. | |
8401 | Note that this never removes the current inferior. */ | |
8402 | prune_inferiors (); | |
4c2f2a79 PA |
8403 | |
8404 | return 0; | |
c906108c | 8405 | } |
c906108c | 8406 | \f |
c5aa993b | 8407 | int |
96baa820 | 8408 | signal_stop_state (int signo) |
c906108c | 8409 | { |
d6b48e9c | 8410 | return signal_stop[signo]; |
c906108c SS |
8411 | } |
8412 | ||
c5aa993b | 8413 | int |
96baa820 | 8414 | signal_print_state (int signo) |
c906108c SS |
8415 | { |
8416 | return signal_print[signo]; | |
8417 | } | |
8418 | ||
c5aa993b | 8419 | int |
96baa820 | 8420 | signal_pass_state (int signo) |
c906108c SS |
8421 | { |
8422 | return signal_program[signo]; | |
8423 | } | |
8424 | ||
2455069d UW |
8425 | static void |
8426 | signal_cache_update (int signo) | |
8427 | { | |
8428 | if (signo == -1) | |
8429 | { | |
a493e3e2 | 8430 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8431 | signal_cache_update (signo); |
8432 | ||
8433 | return; | |
8434 | } | |
8435 | ||
8436 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8437 | && signal_print[signo] == 0 | |
ab04a2af TT |
8438 | && signal_program[signo] == 1 |
8439 | && signal_catch[signo] == 0); | |
2455069d UW |
8440 | } |
8441 | ||
488f131b | 8442 | int |
7bda5e4a | 8443 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8444 | { |
8445 | int ret = signal_stop[signo]; | |
abbb1732 | 8446 | |
d4f3574e | 8447 | signal_stop[signo] = state; |
2455069d | 8448 | signal_cache_update (signo); |
d4f3574e SS |
8449 | return ret; |
8450 | } | |
8451 | ||
488f131b | 8452 | int |
7bda5e4a | 8453 | signal_print_update (int signo, int state) |
d4f3574e SS |
8454 | { |
8455 | int ret = signal_print[signo]; | |
abbb1732 | 8456 | |
d4f3574e | 8457 | signal_print[signo] = state; |
2455069d | 8458 | signal_cache_update (signo); |
d4f3574e SS |
8459 | return ret; |
8460 | } | |
8461 | ||
488f131b | 8462 | int |
7bda5e4a | 8463 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8464 | { |
8465 | int ret = signal_program[signo]; | |
abbb1732 | 8466 | |
d4f3574e | 8467 | signal_program[signo] = state; |
2455069d | 8468 | signal_cache_update (signo); |
d4f3574e SS |
8469 | return ret; |
8470 | } | |
8471 | ||
ab04a2af TT |
8472 | /* Update the global 'signal_catch' from INFO and notify the |
8473 | target. */ | |
8474 | ||
8475 | void | |
8476 | signal_catch_update (const unsigned int *info) | |
8477 | { | |
8478 | int i; | |
8479 | ||
8480 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8481 | signal_catch[i] = info[i] > 0; | |
8482 | signal_cache_update (-1); | |
adc6a863 | 8483 | target_pass_signals (signal_pass); |
ab04a2af TT |
8484 | } |
8485 | ||
c906108c | 8486 | static void |
96baa820 | 8487 | sig_print_header (void) |
c906108c | 8488 | { |
3e43a32a MS |
8489 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8490 | "to program\tDescription\n")); | |
c906108c SS |
8491 | } |
8492 | ||
8493 | static void | |
2ea28649 | 8494 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8495 | { |
2ea28649 | 8496 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8497 | int name_padding = 13 - strlen (name); |
96baa820 | 8498 | |
c906108c SS |
8499 | if (name_padding <= 0) |
8500 | name_padding = 0; | |
8501 | ||
8502 | printf_filtered ("%s", name); | |
488f131b | 8503 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8504 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8505 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8506 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8507 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8508 | } |
8509 | ||
8510 | /* Specify how various signals in the inferior should be handled. */ | |
8511 | ||
8512 | static void | |
0b39b52e | 8513 | handle_command (const char *args, int from_tty) |
c906108c | 8514 | { |
c906108c | 8515 | int digits, wordlen; |
b926417a | 8516 | int sigfirst, siglast; |
2ea28649 | 8517 | enum gdb_signal oursig; |
c906108c | 8518 | int allsigs; |
c906108c SS |
8519 | |
8520 | if (args == NULL) | |
8521 | { | |
e2e0b3e5 | 8522 | error_no_arg (_("signal to handle")); |
c906108c SS |
8523 | } |
8524 | ||
1777feb0 | 8525 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8526 | |
adc6a863 PA |
8527 | const size_t nsigs = GDB_SIGNAL_LAST; |
8528 | unsigned char sigs[nsigs] {}; | |
c906108c | 8529 | |
1777feb0 | 8530 | /* Break the command line up into args. */ |
c906108c | 8531 | |
773a1edc | 8532 | gdb_argv built_argv (args); |
c906108c SS |
8533 | |
8534 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8535 | actions. Signal numbers and signal names may be interspersed with | |
8536 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8537 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8538 | |
773a1edc | 8539 | for (char *arg : built_argv) |
c906108c | 8540 | { |
773a1edc TT |
8541 | wordlen = strlen (arg); |
8542 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8543 | {; |
8544 | } | |
8545 | allsigs = 0; | |
8546 | sigfirst = siglast = -1; | |
8547 | ||
773a1edc | 8548 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8549 | { |
8550 | /* Apply action to all signals except those used by the | |
1777feb0 | 8551 | debugger. Silently skip those. */ |
c906108c SS |
8552 | allsigs = 1; |
8553 | sigfirst = 0; | |
8554 | siglast = nsigs - 1; | |
8555 | } | |
773a1edc | 8556 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8557 | { |
8558 | SET_SIGS (nsigs, sigs, signal_stop); | |
8559 | SET_SIGS (nsigs, sigs, signal_print); | |
8560 | } | |
773a1edc | 8561 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8562 | { |
8563 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8564 | } | |
773a1edc | 8565 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8566 | { |
8567 | SET_SIGS (nsigs, sigs, signal_print); | |
8568 | } | |
773a1edc | 8569 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8570 | { |
8571 | SET_SIGS (nsigs, sigs, signal_program); | |
8572 | } | |
773a1edc | 8573 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8574 | { |
8575 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8576 | } | |
773a1edc | 8577 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8578 | { |
8579 | SET_SIGS (nsigs, sigs, signal_program); | |
8580 | } | |
773a1edc | 8581 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8582 | { |
8583 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8584 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8585 | } | |
773a1edc | 8586 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8587 | { |
8588 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8589 | } | |
8590 | else if (digits > 0) | |
8591 | { | |
8592 | /* It is numeric. The numeric signal refers to our own | |
8593 | internal signal numbering from target.h, not to host/target | |
8594 | signal number. This is a feature; users really should be | |
8595 | using symbolic names anyway, and the common ones like | |
8596 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8597 | ||
8598 | sigfirst = siglast = (int) | |
773a1edc TT |
8599 | gdb_signal_from_command (atoi (arg)); |
8600 | if (arg[digits] == '-') | |
c906108c SS |
8601 | { |
8602 | siglast = (int) | |
773a1edc | 8603 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8604 | } |
8605 | if (sigfirst > siglast) | |
8606 | { | |
1777feb0 | 8607 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8608 | std::swap (sigfirst, siglast); |
c906108c SS |
8609 | } |
8610 | } | |
8611 | else | |
8612 | { | |
773a1edc | 8613 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8614 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8615 | { |
8616 | sigfirst = siglast = (int) oursig; | |
8617 | } | |
8618 | else | |
8619 | { | |
8620 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8621 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8622 | } |
8623 | } | |
8624 | ||
8625 | /* If any signal numbers or symbol names were found, set flags for | |
dda83cd7 | 8626 | which signals to apply actions to. */ |
c906108c | 8627 | |
b926417a | 8628 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8629 | { |
2ea28649 | 8630 | switch ((enum gdb_signal) signum) |
c906108c | 8631 | { |
a493e3e2 PA |
8632 | case GDB_SIGNAL_TRAP: |
8633 | case GDB_SIGNAL_INT: | |
c906108c SS |
8634 | if (!allsigs && !sigs[signum]) |
8635 | { | |
9e2f0ad4 | 8636 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8637 | Are you sure you want to change it? "), |
2ea28649 | 8638 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8639 | { |
8640 | sigs[signum] = 1; | |
8641 | } | |
8642 | else | |
c119e040 | 8643 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8644 | } |
8645 | break; | |
a493e3e2 PA |
8646 | case GDB_SIGNAL_0: |
8647 | case GDB_SIGNAL_DEFAULT: | |
8648 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8649 | /* Make sure that "all" doesn't print these. */ |
8650 | break; | |
8651 | default: | |
8652 | sigs[signum] = 1; | |
8653 | break; | |
8654 | } | |
8655 | } | |
c906108c SS |
8656 | } |
8657 | ||
b926417a | 8658 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8659 | if (sigs[signum]) |
8660 | { | |
2455069d | 8661 | signal_cache_update (-1); |
adc6a863 PA |
8662 | target_pass_signals (signal_pass); |
8663 | target_program_signals (signal_program); | |
c906108c | 8664 | |
3a031f65 PA |
8665 | if (from_tty) |
8666 | { | |
8667 | /* Show the results. */ | |
8668 | sig_print_header (); | |
8669 | for (; signum < nsigs; signum++) | |
8670 | if (sigs[signum]) | |
aead7601 | 8671 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8672 | } |
8673 | ||
8674 | break; | |
8675 | } | |
c906108c SS |
8676 | } |
8677 | ||
de0bea00 MF |
8678 | /* Complete the "handle" command. */ |
8679 | ||
eb3ff9a5 | 8680 | static void |
de0bea00 | 8681 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8682 | completion_tracker &tracker, |
6f937416 | 8683 | const char *text, const char *word) |
de0bea00 | 8684 | { |
de0bea00 MF |
8685 | static const char * const keywords[] = |
8686 | { | |
8687 | "all", | |
8688 | "stop", | |
8689 | "ignore", | |
8690 | "print", | |
8691 | "pass", | |
8692 | "nostop", | |
8693 | "noignore", | |
8694 | "noprint", | |
8695 | "nopass", | |
8696 | NULL, | |
8697 | }; | |
8698 | ||
eb3ff9a5 PA |
8699 | signal_completer (ignore, tracker, text, word); |
8700 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8701 | } |
8702 | ||
2ea28649 PA |
8703 | enum gdb_signal |
8704 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8705 | { |
8706 | if (num >= 1 && num <= 15) | |
2ea28649 | 8707 | return (enum gdb_signal) num; |
ed01b82c PA |
8708 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8709 | Use \"info signals\" for a list of symbolic signals.")); | |
8710 | } | |
8711 | ||
c906108c SS |
8712 | /* Print current contents of the tables set by the handle command. |
8713 | It is possible we should just be printing signals actually used | |
8714 | by the current target (but for things to work right when switching | |
8715 | targets, all signals should be in the signal tables). */ | |
8716 | ||
8717 | static void | |
1d12d88f | 8718 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8719 | { |
2ea28649 | 8720 | enum gdb_signal oursig; |
abbb1732 | 8721 | |
c906108c SS |
8722 | sig_print_header (); |
8723 | ||
8724 | if (signum_exp) | |
8725 | { | |
8726 | /* First see if this is a symbol name. */ | |
2ea28649 | 8727 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8728 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8729 | { |
8730 | /* No, try numeric. */ | |
8731 | oursig = | |
2ea28649 | 8732 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8733 | } |
8734 | sig_print_info (oursig); | |
8735 | return; | |
8736 | } | |
8737 | ||
8738 | printf_filtered ("\n"); | |
8739 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8740 | for (oursig = GDB_SIGNAL_FIRST; |
8741 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8742 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8743 | { |
8744 | QUIT; | |
8745 | ||
a493e3e2 PA |
8746 | if (oursig != GDB_SIGNAL_UNKNOWN |
8747 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8748 | sig_print_info (oursig); |
8749 | } | |
8750 | ||
3e43a32a MS |
8751 | printf_filtered (_("\nUse the \"handle\" command " |
8752 | "to change these tables.\n")); | |
c906108c | 8753 | } |
4aa995e1 PA |
8754 | |
8755 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8756 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8757 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8758 | also dependent on which thread you have selected. |
8759 | ||
8760 | 1. making $_siginfo be an internalvar that creates a new value on | |
8761 | access. | |
8762 | ||
8763 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8764 | ||
8765 | /* This function implements the lval_computed support for reading a | |
8766 | $_siginfo value. */ | |
8767 | ||
8768 | static void | |
8769 | siginfo_value_read (struct value *v) | |
8770 | { | |
8771 | LONGEST transferred; | |
8772 | ||
a911d87a PA |
8773 | /* If we can access registers, so can we access $_siginfo. Likewise |
8774 | vice versa. */ | |
8775 | validate_registers_access (); | |
c709acd1 | 8776 | |
4aa995e1 | 8777 | transferred = |
8b88a78e | 8778 | target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, |
4aa995e1 PA |
8779 | NULL, |
8780 | value_contents_all_raw (v), | |
8781 | value_offset (v), | |
8782 | TYPE_LENGTH (value_type (v))); | |
8783 | ||
8784 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8785 | error (_("Unable to read siginfo")); | |
8786 | } | |
8787 | ||
8788 | /* This function implements the lval_computed support for writing a | |
8789 | $_siginfo value. */ | |
8790 | ||
8791 | static void | |
8792 | siginfo_value_write (struct value *v, struct value *fromval) | |
8793 | { | |
8794 | LONGEST transferred; | |
8795 | ||
a911d87a PA |
8796 | /* If we can access registers, so can we access $_siginfo. Likewise |
8797 | vice versa. */ | |
8798 | validate_registers_access (); | |
c709acd1 | 8799 | |
8b88a78e | 8800 | transferred = target_write (current_top_target (), |
4aa995e1 PA |
8801 | TARGET_OBJECT_SIGNAL_INFO, |
8802 | NULL, | |
8803 | value_contents_all_raw (fromval), | |
8804 | value_offset (v), | |
8805 | TYPE_LENGTH (value_type (fromval))); | |
8806 | ||
8807 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8808 | error (_("Unable to write siginfo")); | |
8809 | } | |
8810 | ||
c8f2448a | 8811 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8812 | { |
8813 | siginfo_value_read, | |
8814 | siginfo_value_write | |
8815 | }; | |
8816 | ||
8817 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8818 | the current thread using architecture GDBARCH. Return a void value |
8819 | if there's no object available. */ | |
4aa995e1 | 8820 | |
2c0b251b | 8821 | static struct value * |
22d2b532 SDJ |
8822 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8823 | void *ignore) | |
4aa995e1 | 8824 | { |
841de120 | 8825 | if (target_has_stack () |
d7e15655 | 8826 | && inferior_ptid != null_ptid |
78267919 | 8827 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 8828 | { |
78267919 | 8829 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8830 | |
78267919 | 8831 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8832 | } |
8833 | ||
78267919 | 8834 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8835 | } |
8836 | ||
c906108c | 8837 | \f |
16c381f0 JK |
8838 | /* infcall_suspend_state contains state about the program itself like its |
8839 | registers and any signal it received when it last stopped. | |
8840 | This state must be restored regardless of how the inferior function call | |
8841 | ends (either successfully, or after it hits a breakpoint or signal) | |
8842 | if the program is to properly continue where it left off. */ | |
8843 | ||
6bf78e29 | 8844 | class infcall_suspend_state |
7a292a7a | 8845 | { |
6bf78e29 AB |
8846 | public: |
8847 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
8848 | once the inferior function call has finished. */ | |
8849 | infcall_suspend_state (struct gdbarch *gdbarch, | |
dda83cd7 SM |
8850 | const struct thread_info *tp, |
8851 | struct regcache *regcache) | |
6bf78e29 AB |
8852 | : m_thread_suspend (tp->suspend), |
8853 | m_registers (new readonly_detached_regcache (*regcache)) | |
8854 | { | |
8855 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
8856 | ||
8857 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8858 | { | |
dda83cd7 SM |
8859 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
8860 | size_t len = TYPE_LENGTH (type); | |
6bf78e29 | 8861 | |
dda83cd7 | 8862 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); |
6bf78e29 | 8863 | |
dda83cd7 SM |
8864 | if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, |
8865 | siginfo_data.get (), 0, len) != len) | |
8866 | { | |
8867 | /* Errors ignored. */ | |
8868 | siginfo_data.reset (nullptr); | |
8869 | } | |
6bf78e29 AB |
8870 | } |
8871 | ||
8872 | if (siginfo_data) | |
8873 | { | |
dda83cd7 SM |
8874 | m_siginfo_gdbarch = gdbarch; |
8875 | m_siginfo_data = std::move (siginfo_data); | |
6bf78e29 AB |
8876 | } |
8877 | } | |
8878 | ||
8879 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 8880 | |
6bf78e29 AB |
8881 | readonly_detached_regcache *registers () const |
8882 | { | |
8883 | return m_registers.get (); | |
8884 | } | |
8885 | ||
8886 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
8887 | ||
8888 | void restore (struct gdbarch *gdbarch, | |
dda83cd7 SM |
8889 | struct thread_info *tp, |
8890 | struct regcache *regcache) const | |
6bf78e29 AB |
8891 | { |
8892 | tp->suspend = m_thread_suspend; | |
8893 | ||
8894 | if (m_siginfo_gdbarch == gdbarch) | |
8895 | { | |
dda83cd7 | 8896 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
6bf78e29 | 8897 | |
dda83cd7 SM |
8898 | /* Errors ignored. */ |
8899 | target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8900 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); | |
6bf78e29 AB |
8901 | } |
8902 | ||
8903 | /* The inferior can be gone if the user types "print exit(0)" | |
8904 | (and perhaps other times). */ | |
55f6301a | 8905 | if (target_has_execution ()) |
6bf78e29 AB |
8906 | /* NB: The register write goes through to the target. */ |
8907 | regcache->restore (registers ()); | |
8908 | } | |
8909 | ||
8910 | private: | |
8911 | /* How the current thread stopped before the inferior function call was | |
8912 | executed. */ | |
8913 | struct thread_suspend_state m_thread_suspend; | |
8914 | ||
8915 | /* The registers before the inferior function call was executed. */ | |
8916 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 8917 | |
35515841 | 8918 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 8919 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
8920 | |
8921 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8922 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8923 | content would be invalid. */ | |
6bf78e29 | 8924 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
8925 | }; |
8926 | ||
cb524840 TT |
8927 | infcall_suspend_state_up |
8928 | save_infcall_suspend_state () | |
b89667eb | 8929 | { |
b89667eb | 8930 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 8931 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8932 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 8933 | |
6bf78e29 AB |
8934 | infcall_suspend_state_up inf_state |
8935 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 8936 | |
6bf78e29 AB |
8937 | /* Having saved the current state, adjust the thread state, discarding |
8938 | any stop signal information. The stop signal is not useful when | |
8939 | starting an inferior function call, and run_inferior_call will not use | |
8940 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 8941 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 8942 | |
b89667eb DE |
8943 | return inf_state; |
8944 | } | |
8945 | ||
8946 | /* Restore inferior session state to INF_STATE. */ | |
8947 | ||
8948 | void | |
16c381f0 | 8949 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8950 | { |
8951 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 8952 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8953 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 8954 | |
6bf78e29 | 8955 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 8956 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8957 | } |
8958 | ||
b89667eb | 8959 | void |
16c381f0 | 8960 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 8961 | { |
dd848631 | 8962 | delete inf_state; |
b89667eb DE |
8963 | } |
8964 | ||
daf6667d | 8965 | readonly_detached_regcache * |
16c381f0 | 8966 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 8967 | { |
6bf78e29 | 8968 | return inf_state->registers (); |
b89667eb DE |
8969 | } |
8970 | ||
16c381f0 JK |
8971 | /* infcall_control_state contains state regarding gdb's control of the |
8972 | inferior itself like stepping control. It also contains session state like | |
8973 | the user's currently selected frame. */ | |
b89667eb | 8974 | |
16c381f0 | 8975 | struct infcall_control_state |
b89667eb | 8976 | { |
16c381f0 JK |
8977 | struct thread_control_state thread_control; |
8978 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
8979 | |
8980 | /* Other fields: */ | |
ee841dd8 TT |
8981 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
8982 | int stopped_by_random_signal = 0; | |
7a292a7a | 8983 | |
79952e69 PA |
8984 | /* ID and level of the selected frame when the inferior function |
8985 | call was made. */ | |
ee841dd8 | 8986 | struct frame_id selected_frame_id {}; |
79952e69 | 8987 | int selected_frame_level = -1; |
7a292a7a SS |
8988 | }; |
8989 | ||
c906108c | 8990 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 8991 | connection. */ |
c906108c | 8992 | |
cb524840 TT |
8993 | infcall_control_state_up |
8994 | save_infcall_control_state () | |
c906108c | 8995 | { |
cb524840 | 8996 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 8997 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 8998 | struct inferior *inf = current_inferior (); |
7a292a7a | 8999 | |
16c381f0 JK |
9000 | inf_status->thread_control = tp->control; |
9001 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9002 | |
8358c15c | 9003 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9004 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9005 | |
16c381f0 JK |
9006 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9007 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9008 | hand them back the original chain when restore_infcall_control_state is | |
9009 | called. */ | |
9010 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9011 | |
9012 | /* Other fields: */ | |
9013 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9014 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9015 | |
79952e69 PA |
9016 | save_selected_frame (&inf_status->selected_frame_id, |
9017 | &inf_status->selected_frame_level); | |
b89667eb | 9018 | |
7a292a7a | 9019 | return inf_status; |
c906108c SS |
9020 | } |
9021 | ||
b89667eb DE |
9022 | /* Restore inferior session state to INF_STATUS. */ |
9023 | ||
c906108c | 9024 | void |
16c381f0 | 9025 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9026 | { |
4e1c45ea | 9027 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9028 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9029 | |
8358c15c JK |
9030 | if (tp->control.step_resume_breakpoint) |
9031 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9032 | ||
5b79abe7 TT |
9033 | if (tp->control.exception_resume_breakpoint) |
9034 | tp->control.exception_resume_breakpoint->disposition | |
9035 | = disp_del_at_next_stop; | |
9036 | ||
d82142e2 | 9037 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9038 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9039 | |
16c381f0 JK |
9040 | tp->control = inf_status->thread_control; |
9041 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9042 | |
9043 | /* Other fields: */ | |
9044 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9045 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9046 | |
841de120 | 9047 | if (target_has_stack ()) |
c906108c | 9048 | { |
79952e69 PA |
9049 | restore_selected_frame (inf_status->selected_frame_id, |
9050 | inf_status->selected_frame_level); | |
c906108c | 9051 | } |
c906108c | 9052 | |
ee841dd8 | 9053 | delete inf_status; |
7a292a7a | 9054 | } |
c906108c SS |
9055 | |
9056 | void | |
16c381f0 | 9057 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9058 | { |
8358c15c JK |
9059 | if (inf_status->thread_control.step_resume_breakpoint) |
9060 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9061 | = disp_del_at_next_stop; | |
9062 | ||
5b79abe7 TT |
9063 | if (inf_status->thread_control.exception_resume_breakpoint) |
9064 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9065 | = disp_del_at_next_stop; | |
9066 | ||
1777feb0 | 9067 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9068 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9069 | |
ee841dd8 | 9070 | delete inf_status; |
7a292a7a | 9071 | } |
b89667eb | 9072 | \f |
7f89fd65 | 9073 | /* See infrun.h. */ |
0c557179 SDJ |
9074 | |
9075 | void | |
9076 | clear_exit_convenience_vars (void) | |
9077 | { | |
9078 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9079 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9080 | } | |
c5aa993b | 9081 | \f |
488f131b | 9082 | |
b2175913 MS |
9083 | /* User interface for reverse debugging: |
9084 | Set exec-direction / show exec-direction commands | |
9085 | (returns error unless target implements to_set_exec_direction method). */ | |
9086 | ||
170742de | 9087 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9088 | static const char exec_forward[] = "forward"; |
9089 | static const char exec_reverse[] = "reverse"; | |
9090 | static const char *exec_direction = exec_forward; | |
40478521 | 9091 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9092 | exec_forward, |
9093 | exec_reverse, | |
9094 | NULL | |
9095 | }; | |
9096 | ||
9097 | static void | |
eb4c3f4a | 9098 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9099 | struct cmd_list_element *cmd) |
9100 | { | |
05374cfd | 9101 | if (target_can_execute_reverse ()) |
b2175913 MS |
9102 | { |
9103 | if (!strcmp (exec_direction, exec_forward)) | |
9104 | execution_direction = EXEC_FORWARD; | |
9105 | else if (!strcmp (exec_direction, exec_reverse)) | |
9106 | execution_direction = EXEC_REVERSE; | |
9107 | } | |
8bbed405 MS |
9108 | else |
9109 | { | |
9110 | exec_direction = exec_forward; | |
9111 | error (_("Target does not support this operation.")); | |
9112 | } | |
b2175913 MS |
9113 | } |
9114 | ||
9115 | static void | |
9116 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9117 | struct cmd_list_element *cmd, const char *value) | |
9118 | { | |
9119 | switch (execution_direction) { | |
9120 | case EXEC_FORWARD: | |
9121 | fprintf_filtered (out, _("Forward.\n")); | |
9122 | break; | |
9123 | case EXEC_REVERSE: | |
9124 | fprintf_filtered (out, _("Reverse.\n")); | |
9125 | break; | |
b2175913 | 9126 | default: |
d8b34453 PA |
9127 | internal_error (__FILE__, __LINE__, |
9128 | _("bogus execution_direction value: %d"), | |
9129 | (int) execution_direction); | |
b2175913 MS |
9130 | } |
9131 | } | |
9132 | ||
d4db2f36 PA |
9133 | static void |
9134 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9135 | struct cmd_list_element *c, const char *value) | |
9136 | { | |
3e43a32a MS |
9137 | fprintf_filtered (file, _("Resuming the execution of threads " |
9138 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9139 | } |
ad52ddc6 | 9140 | |
22d2b532 SDJ |
9141 | /* Implementation of `siginfo' variable. */ |
9142 | ||
9143 | static const struct internalvar_funcs siginfo_funcs = | |
9144 | { | |
9145 | siginfo_make_value, | |
9146 | NULL, | |
9147 | NULL | |
9148 | }; | |
9149 | ||
372316f1 PA |
9150 | /* Callback for infrun's target events source. This is marked when a |
9151 | thread has a pending status to process. */ | |
9152 | ||
9153 | static void | |
9154 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9155 | { | |
b1a35af2 | 9156 | inferior_event_handler (INF_REG_EVENT); |
372316f1 PA |
9157 | } |
9158 | ||
8087c3fa | 9159 | #if GDB_SELF_TEST |
b161a60d SM |
9160 | namespace selftests |
9161 | { | |
9162 | ||
9163 | /* Verify that when two threads with the same ptid exist (from two different | |
9164 | targets) and one of them changes ptid, we only update inferior_ptid if | |
9165 | it is appropriate. */ | |
9166 | ||
9167 | static void | |
9168 | infrun_thread_ptid_changed () | |
9169 | { | |
9170 | gdbarch *arch = current_inferior ()->gdbarch; | |
9171 | ||
9172 | /* The thread which inferior_ptid represents changes ptid. */ | |
9173 | { | |
9174 | scoped_restore_current_pspace_and_thread restore; | |
9175 | ||
9176 | scoped_mock_context<test_target_ops> target1 (arch); | |
9177 | scoped_mock_context<test_target_ops> target2 (arch); | |
9178 | target2.mock_inferior.next = &target1.mock_inferior; | |
9179 | ||
9180 | ptid_t old_ptid (111, 222); | |
9181 | ptid_t new_ptid (111, 333); | |
9182 | ||
9183 | target1.mock_inferior.pid = old_ptid.pid (); | |
9184 | target1.mock_thread.ptid = old_ptid; | |
9185 | target2.mock_inferior.pid = old_ptid.pid (); | |
9186 | target2.mock_thread.ptid = old_ptid; | |
9187 | ||
9188 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
9189 | set_current_inferior (&target1.mock_inferior); | |
9190 | ||
9191 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9192 | ||
9193 | gdb_assert (inferior_ptid == new_ptid); | |
9194 | } | |
9195 | ||
9196 | /* A thread with the same ptid as inferior_ptid, but from another target, | |
9197 | changes ptid. */ | |
9198 | { | |
9199 | scoped_restore_current_pspace_and_thread restore; | |
9200 | ||
9201 | scoped_mock_context<test_target_ops> target1 (arch); | |
9202 | scoped_mock_context<test_target_ops> target2 (arch); | |
9203 | target2.mock_inferior.next = &target1.mock_inferior; | |
9204 | ||
9205 | ptid_t old_ptid (111, 222); | |
9206 | ptid_t new_ptid (111, 333); | |
9207 | ||
9208 | target1.mock_inferior.pid = old_ptid.pid (); | |
9209 | target1.mock_thread.ptid = old_ptid; | |
9210 | target2.mock_inferior.pid = old_ptid.pid (); | |
9211 | target2.mock_thread.ptid = old_ptid; | |
9212 | ||
9213 | auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid); | |
9214 | set_current_inferior (&target2.mock_inferior); | |
9215 | ||
9216 | thread_change_ptid (&target1.mock_target, old_ptid, new_ptid); | |
9217 | ||
9218 | gdb_assert (inferior_ptid == old_ptid); | |
9219 | } | |
9220 | } | |
9221 | ||
9222 | } /* namespace selftests */ | |
9223 | ||
8087c3fa JB |
9224 | #endif /* GDB_SELF_TEST */ |
9225 | ||
6c265988 | 9226 | void _initialize_infrun (); |
c906108c | 9227 | void |
6c265988 | 9228 | _initialize_infrun () |
c906108c | 9229 | { |
de0bea00 | 9230 | struct cmd_list_element *c; |
c906108c | 9231 | |
372316f1 PA |
9232 | /* Register extra event sources in the event loop. */ |
9233 | infrun_async_inferior_event_token | |
db20ebdf SM |
9234 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL, |
9235 | "infrun"); | |
372316f1 | 9236 | |
11db9430 | 9237 | add_info ("signals", info_signals_command, _("\ |
1bedd215 AC |
9238 | What debugger does when program gets various signals.\n\ |
9239 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9240 | add_info_alias ("handle", "signals", 0); |
9241 | ||
de0bea00 | 9242 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9243 | Specify how to handle signals.\n\ |
486c7739 | 9244 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9245 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9246 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9247 | will be displayed instead.\n\ |
9248 | \n\ | |
c906108c SS |
9249 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9250 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9251 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9252 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9253 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9254 | \n\ |
1bedd215 | 9255 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9256 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9257 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9258 | Print means print a message if this signal happens.\n\ | |
9259 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9260 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9261 | Pass and Stop may be combined.\n\ |
9262 | \n\ | |
9263 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9264 | may be interspersed with actions, with the actions being performed for\n\ | |
9265 | all signals cumulatively specified.")); | |
de0bea00 | 9266 | set_cmd_completer (c, handle_completer); |
486c7739 | 9267 | |
c906108c | 9268 | if (!dbx_commands) |
1a966eab AC |
9269 | stop_command = add_cmd ("stop", class_obscure, |
9270 | not_just_help_class_command, _("\ | |
9271 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9272 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9273 | of the program stops."), &cmdlist); |
c906108c | 9274 | |
94ba44a6 SM |
9275 | add_setshow_boolean_cmd |
9276 | ("infrun", class_maintenance, &debug_infrun, | |
9277 | _("Set inferior debugging."), | |
9278 | _("Show inferior debugging."), | |
9279 | _("When non-zero, inferior specific debugging is enabled."), | |
9280 | NULL, show_debug_infrun, &setdebuglist, &showdebuglist); | |
527159b7 | 9281 | |
ad52ddc6 PA |
9282 | add_setshow_boolean_cmd ("non-stop", no_class, |
9283 | &non_stop_1, _("\ | |
9284 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9285 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9286 | When debugging a multi-threaded program and this setting is\n\ | |
9287 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9288 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9289 | all other threads in the program while you interact with the thread of\n\ | |
9290 | interest. When you continue or step a thread, you can allow the other\n\ | |
9291 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9292 | thread's state, all threads stop.\n\ | |
9293 | \n\ | |
9294 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9295 | to run freely. You'll be able to step each thread independently,\n\ | |
9296 | leave it stopped or free to run as needed."), | |
9297 | set_non_stop, | |
9298 | show_non_stop, | |
9299 | &setlist, | |
9300 | &showlist); | |
9301 | ||
adc6a863 | 9302 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9303 | { |
9304 | signal_stop[i] = 1; | |
9305 | signal_print[i] = 1; | |
9306 | signal_program[i] = 1; | |
ab04a2af | 9307 | signal_catch[i] = 0; |
c906108c SS |
9308 | } |
9309 | ||
4d9d9d04 PA |
9310 | /* Signals caused by debugger's own actions should not be given to |
9311 | the program afterwards. | |
9312 | ||
9313 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9314 | explicitly specifies that it should be delivered to the target | |
9315 | program. Typically, that would occur when a user is debugging a | |
9316 | target monitor on a simulator: the target monitor sets a | |
9317 | breakpoint; the simulator encounters this breakpoint and halts | |
9318 | the simulation handing control to GDB; GDB, noting that the stop | |
9319 | address doesn't map to any known breakpoint, returns control back | |
9320 | to the simulator; the simulator then delivers the hardware | |
9321 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9322 | debugged. */ | |
a493e3e2 PA |
9323 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9324 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9325 | |
9326 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9327 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9328 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9329 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9330 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9331 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9332 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9333 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9334 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9335 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9336 | signal_print[GDB_SIGNAL_IO] = 0; | |
9337 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9338 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9339 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9340 | signal_print[GDB_SIGNAL_URG] = 0; | |
9341 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9342 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9343 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9344 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9345 | |
cd0fc7c3 SS |
9346 | /* These signals are used internally by user-level thread |
9347 | implementations. (See signal(5) on Solaris.) Like the above | |
9348 | signals, a healthy program receives and handles them as part of | |
9349 | its normal operation. */ | |
a493e3e2 PA |
9350 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9351 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9352 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9353 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9354 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9355 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9356 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9357 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9358 | |
2455069d UW |
9359 | /* Update cached state. */ |
9360 | signal_cache_update (-1); | |
9361 | ||
85c07804 AC |
9362 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9363 | &stop_on_solib_events, _("\ | |
9364 | Set stopping for shared library events."), _("\ | |
9365 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9366 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9367 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9368 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9369 | set_stop_on_solib_events, |
920d2a44 | 9370 | show_stop_on_solib_events, |
85c07804 | 9371 | &setlist, &showlist); |
c906108c | 9372 | |
7ab04401 AC |
9373 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9374 | follow_fork_mode_kind_names, | |
9375 | &follow_fork_mode_string, _("\ | |
9376 | Set debugger response to a program call of fork or vfork."), _("\ | |
9377 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9378 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9379 | parent - the original process is debugged after a fork\n\ | |
9380 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9381 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9382 | By default, the debugger will follow the parent process."), |
9383 | NULL, | |
920d2a44 | 9384 | show_follow_fork_mode_string, |
7ab04401 AC |
9385 | &setlist, &showlist); |
9386 | ||
6c95b8df PA |
9387 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9388 | follow_exec_mode_names, | |
9389 | &follow_exec_mode_string, _("\ | |
9390 | Set debugger response to a program call of exec."), _("\ | |
9391 | Show debugger response to a program call of exec."), _("\ | |
9392 | An exec call replaces the program image of a process.\n\ | |
9393 | \n\ | |
9394 | follow-exec-mode can be:\n\ | |
9395 | \n\ | |
cce7e648 | 9396 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9397 | to this new inferior. The program the process was running before\n\ |
9398 | the exec call can be restarted afterwards by restarting the original\n\ | |
9399 | inferior.\n\ | |
9400 | \n\ | |
9401 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9402 | The new executable image replaces the previous executable loaded in\n\ | |
9403 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9404 | the executable the process was running after the exec call.\n\ | |
9405 | \n\ | |
9406 | By default, the debugger will use the same inferior."), | |
9407 | NULL, | |
9408 | show_follow_exec_mode_string, | |
9409 | &setlist, &showlist); | |
9410 | ||
7ab04401 AC |
9411 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9412 | scheduler_enums, &scheduler_mode, _("\ | |
9413 | Set mode for locking scheduler during execution."), _("\ | |
9414 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9415 | off == no locking (threads may preempt at any time)\n\ |
9416 | on == full locking (no thread except the current thread may run)\n\ | |
dda83cd7 | 9417 | This applies to both normal execution and replay mode.\n\ |
f2665db5 | 9418 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ |
dda83cd7 SM |
9419 | In this mode, other threads may run during other commands.\n\ |
9420 | This applies to both normal execution and replay mode.\n\ | |
f2665db5 | 9421 | replay == scheduler locked in replay mode and unlocked during normal execution."), |
7ab04401 | 9422 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9423 | show_scheduler_mode, |
7ab04401 | 9424 | &setlist, &showlist); |
5fbbeb29 | 9425 | |
d4db2f36 PA |
9426 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9427 | Set mode for resuming threads of all processes."), _("\ | |
9428 | Show mode for resuming threads of all processes."), _("\ | |
9429 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9430 | threads of all processes. When off (which is the default), execution\n\ | |
9431 | commands only resume the threads of the current process. The set of\n\ | |
9432 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9433 | mode (see help set scheduler-locking)."), | |
9434 | NULL, | |
9435 | show_schedule_multiple, | |
9436 | &setlist, &showlist); | |
9437 | ||
5bf193a2 AC |
9438 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9439 | Set mode of the step operation."), _("\ | |
9440 | Show mode of the step operation."), _("\ | |
9441 | When set, doing a step over a function without debug line information\n\ | |
9442 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9443 | function is skipped and the step command stops at a different source line."), | |
9444 | NULL, | |
920d2a44 | 9445 | show_step_stop_if_no_debug, |
5bf193a2 | 9446 | &setlist, &showlist); |
ca6724c1 | 9447 | |
72d0e2c5 YQ |
9448 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9449 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9450 | Set debugger's willingness to use displaced stepping."), _("\ |
9451 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9452 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9453 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9454 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9455 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9456 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9457 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9458 | NULL, |
9459 | show_can_use_displaced_stepping, | |
9460 | &setlist, &showlist); | |
237fc4c9 | 9461 | |
b2175913 MS |
9462 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9463 | &exec_direction, _("Set direction of execution.\n\ | |
9464 | Options are 'forward' or 'reverse'."), | |
9465 | _("Show direction of execution (forward/reverse)."), | |
9466 | _("Tells gdb whether to execute forward or backward."), | |
9467 | set_exec_direction_func, show_exec_direction_func, | |
9468 | &setlist, &showlist); | |
9469 | ||
6c95b8df PA |
9470 | /* Set/show detach-on-fork: user-settable mode. */ |
9471 | ||
9472 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9473 | Set whether gdb will detach the child of a fork."), _("\ | |
9474 | Show whether gdb will detach the child of a fork."), _("\ | |
9475 | Tells gdb whether to detach the child of a fork."), | |
9476 | NULL, NULL, &setlist, &showlist); | |
9477 | ||
03583c20 UW |
9478 | /* Set/show disable address space randomization mode. */ |
9479 | ||
9480 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9481 | &disable_randomization, _("\ | |
9482 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9483 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9484 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9485 | address space is disabled. Standalone programs run with the randomization\n\ | |
9486 | enabled by default on some platforms."), | |
9487 | &set_disable_randomization, | |
9488 | &show_disable_randomization, | |
9489 | &setlist, &showlist); | |
9490 | ||
ca6724c1 | 9491 | /* ptid initializations */ |
ca6724c1 KB |
9492 | inferior_ptid = null_ptid; |
9493 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9494 | |
76727919 TT |
9495 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed); |
9496 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested); | |
9497 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit); | |
9498 | gdb::observers::inferior_exit.attach (infrun_inferior_exit); | |
3b7a962d | 9499 | gdb::observers::inferior_execd.attach (infrun_inferior_execd); |
4aa995e1 PA |
9500 | |
9501 | /* Explicitly create without lookup, since that tries to create a | |
9502 | value with a void typed value, and when we get here, gdbarch | |
9503 | isn't initialized yet. At this point, we're quite sure there | |
9504 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9505 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9506 | |
9507 | add_setshow_boolean_cmd ("observer", no_class, | |
9508 | &observer_mode_1, _("\ | |
9509 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9510 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9511 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9512 | affect its execution. Registers and memory may not be changed,\n\ | |
9513 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9514 | or signalled."), | |
9515 | set_observer_mode, | |
9516 | show_observer_mode, | |
9517 | &setlist, | |
9518 | &showlist); | |
b161a60d SM |
9519 | |
9520 | #if GDB_SELF_TEST | |
9521 | selftests::register_test ("infrun_thread_ptid_changed", | |
9522 | selftests::infrun_thread_ptid_changed); | |
9523 | #endif | |
c906108c | 9524 | } |