Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
b811d2c2 | 4 | Copyright (C) 1986-2020 Free Software Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 11 | (at your option) any later version. |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | #include "defs.h" | |
4100594e SM |
22 | #include "gdbsupport/common-defs.h" |
23 | #include "gdbsupport/common-utils.h" | |
45741a9c | 24 | #include "infrun.h" |
c906108c SS |
25 | #include <ctype.h> |
26 | #include "symtab.h" | |
27 | #include "frame.h" | |
28 | #include "inferior.h" | |
29 | #include "breakpoint.h" | |
c906108c SS |
30 | #include "gdbcore.h" |
31 | #include "gdbcmd.h" | |
32 | #include "target.h" | |
2f4fcf00 | 33 | #include "target-connection.h" |
c906108c SS |
34 | #include "gdbthread.h" |
35 | #include "annotate.h" | |
1adeb98a | 36 | #include "symfile.h" |
7a292a7a | 37 | #include "top.h" |
2acceee2 | 38 | #include "inf-loop.h" |
4e052eda | 39 | #include "regcache.h" |
fd0407d6 | 40 | #include "value.h" |
76727919 | 41 | #include "observable.h" |
f636b87d | 42 | #include "language.h" |
a77053c2 | 43 | #include "solib.h" |
f17517ea | 44 | #include "main.h" |
186c406b | 45 | #include "block.h" |
034dad6f | 46 | #include "mi/mi-common.h" |
4f8d22e3 | 47 | #include "event-top.h" |
96429cc8 | 48 | #include "record.h" |
d02ed0bb | 49 | #include "record-full.h" |
edb3359d | 50 | #include "inline-frame.h" |
4efc6507 | 51 | #include "jit.h" |
06cd862c | 52 | #include "tracepoint.h" |
1bfeeb0f | 53 | #include "skip.h" |
28106bc2 SDJ |
54 | #include "probe.h" |
55 | #include "objfiles.h" | |
de0bea00 | 56 | #include "completer.h" |
9107fc8d | 57 | #include "target-descriptions.h" |
f15cb84a | 58 | #include "target-dcache.h" |
d83ad864 | 59 | #include "terminal.h" |
ff862be4 | 60 | #include "solist.h" |
400b5eca | 61 | #include "gdbsupport/event-loop.h" |
243a9253 | 62 | #include "thread-fsm.h" |
268a13a5 | 63 | #include "gdbsupport/enum-flags.h" |
5ed8105e | 64 | #include "progspace-and-thread.h" |
268a13a5 | 65 | #include "gdbsupport/gdb_optional.h" |
46a62268 | 66 | #include "arch-utils.h" |
268a13a5 TT |
67 | #include "gdbsupport/scope-exit.h" |
68 | #include "gdbsupport/forward-scope-exit.h" | |
06cc9596 | 69 | #include "gdbsupport/gdb_select.h" |
5b6d1e4f | 70 | #include <unordered_map> |
93b54c8e | 71 | #include "async-event.h" |
c906108c SS |
72 | |
73 | /* Prototypes for local functions */ | |
74 | ||
2ea28649 | 75 | static void sig_print_info (enum gdb_signal); |
c906108c | 76 | |
96baa820 | 77 | static void sig_print_header (void); |
c906108c | 78 | |
d83ad864 DB |
79 | static void follow_inferior_reset_breakpoints (void); |
80 | ||
a289b8f6 JK |
81 | static int currently_stepping (struct thread_info *tp); |
82 | ||
2c03e5be | 83 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
84 | |
85 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
86 | ||
2484c66b UW |
87 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
88 | ||
8550d3b3 YQ |
89 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
90 | ||
aff4e175 AB |
91 | static void resume (gdb_signal sig); |
92 | ||
5b6d1e4f PA |
93 | static void wait_for_inferior (inferior *inf); |
94 | ||
372316f1 PA |
95 | /* Asynchronous signal handler registered as event loop source for |
96 | when we have pending events ready to be passed to the core. */ | |
97 | static struct async_event_handler *infrun_async_inferior_event_token; | |
98 | ||
99 | /* Stores whether infrun_async was previously enabled or disabled. | |
100 | Starts off as -1, indicating "never enabled/disabled". */ | |
101 | static int infrun_is_async = -1; | |
102 | ||
4100594e SM |
103 | #define infrun_log_debug(fmt, args...) \ |
104 | infrun_log_debug_1 (__LINE__, __func__, fmt, ##args) | |
105 | ||
106 | static void ATTRIBUTE_PRINTF(3, 4) | |
107 | infrun_log_debug_1 (int line, const char *func, | |
108 | const char *fmt, ...) | |
109 | { | |
110 | if (debug_infrun) | |
111 | { | |
112 | va_list args; | |
113 | va_start (args, fmt); | |
114 | std::string msg = string_vprintf (fmt, args); | |
115 | va_end (args); | |
116 | ||
117 | fprintf_unfiltered (gdb_stdout, "infrun: %s: %s\n", func, msg.c_str ()); | |
118 | } | |
119 | } | |
120 | ||
372316f1 PA |
121 | /* See infrun.h. */ |
122 | ||
123 | void | |
124 | infrun_async (int enable) | |
125 | { | |
126 | if (infrun_is_async != enable) | |
127 | { | |
128 | infrun_is_async = enable; | |
129 | ||
4100594e | 130 | infrun_log_debug ("enable=%d", enable); |
372316f1 PA |
131 | |
132 | if (enable) | |
133 | mark_async_event_handler (infrun_async_inferior_event_token); | |
134 | else | |
135 | clear_async_event_handler (infrun_async_inferior_event_token); | |
136 | } | |
137 | } | |
138 | ||
0b333c5e PA |
139 | /* See infrun.h. */ |
140 | ||
141 | void | |
142 | mark_infrun_async_event_handler (void) | |
143 | { | |
144 | mark_async_event_handler (infrun_async_inferior_event_token); | |
145 | } | |
146 | ||
5fbbeb29 CF |
147 | /* When set, stop the 'step' command if we enter a function which has |
148 | no line number information. The normal behavior is that we step | |
149 | over such function. */ | |
491144b5 | 150 | bool step_stop_if_no_debug = false; |
920d2a44 AC |
151 | static void |
152 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
153 | struct cmd_list_element *c, const char *value) | |
154 | { | |
155 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
156 | } | |
5fbbeb29 | 157 | |
b9f437de PA |
158 | /* proceed and normal_stop use this to notify the user when the |
159 | inferior stopped in a different thread than it had been running | |
160 | in. */ | |
96baa820 | 161 | |
39f77062 | 162 | static ptid_t previous_inferior_ptid; |
7a292a7a | 163 | |
07107ca6 LM |
164 | /* If set (default for legacy reasons), when following a fork, GDB |
165 | will detach from one of the fork branches, child or parent. | |
166 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
167 | setting. */ | |
168 | ||
491144b5 | 169 | static bool detach_fork = true; |
6c95b8df | 170 | |
491144b5 | 171 | bool debug_displaced = false; |
237fc4c9 PA |
172 | static void |
173 | show_debug_displaced (struct ui_file *file, int from_tty, | |
174 | struct cmd_list_element *c, const char *value) | |
175 | { | |
176 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
177 | } | |
178 | ||
ccce17b0 | 179 | unsigned int debug_infrun = 0; |
920d2a44 AC |
180 | static void |
181 | show_debug_infrun (struct ui_file *file, int from_tty, | |
182 | struct cmd_list_element *c, const char *value) | |
183 | { | |
184 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
185 | } | |
527159b7 | 186 | |
03583c20 UW |
187 | |
188 | /* Support for disabling address space randomization. */ | |
189 | ||
491144b5 | 190 | bool disable_randomization = true; |
03583c20 UW |
191 | |
192 | static void | |
193 | show_disable_randomization (struct ui_file *file, int from_tty, | |
194 | struct cmd_list_element *c, const char *value) | |
195 | { | |
196 | if (target_supports_disable_randomization ()) | |
197 | fprintf_filtered (file, | |
198 | _("Disabling randomization of debuggee's " | |
199 | "virtual address space is %s.\n"), | |
200 | value); | |
201 | else | |
202 | fputs_filtered (_("Disabling randomization of debuggee's " | |
203 | "virtual address space is unsupported on\n" | |
204 | "this platform.\n"), file); | |
205 | } | |
206 | ||
207 | static void | |
eb4c3f4a | 208 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
209 | struct cmd_list_element *c) |
210 | { | |
211 | if (!target_supports_disable_randomization ()) | |
212 | error (_("Disabling randomization of debuggee's " | |
213 | "virtual address space is unsupported on\n" | |
214 | "this platform.")); | |
215 | } | |
216 | ||
d32dc48e PA |
217 | /* User interface for non-stop mode. */ |
218 | ||
491144b5 CB |
219 | bool non_stop = false; |
220 | static bool non_stop_1 = false; | |
d32dc48e PA |
221 | |
222 | static void | |
eb4c3f4a | 223 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
224 | struct cmd_list_element *c) |
225 | { | |
226 | if (target_has_execution) | |
227 | { | |
228 | non_stop_1 = non_stop; | |
229 | error (_("Cannot change this setting while the inferior is running.")); | |
230 | } | |
231 | ||
232 | non_stop = non_stop_1; | |
233 | } | |
234 | ||
235 | static void | |
236 | show_non_stop (struct ui_file *file, int from_tty, | |
237 | struct cmd_list_element *c, const char *value) | |
238 | { | |
239 | fprintf_filtered (file, | |
240 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
241 | value); | |
242 | } | |
243 | ||
d914c394 SS |
244 | /* "Observer mode" is somewhat like a more extreme version of |
245 | non-stop, in which all GDB operations that might affect the | |
246 | target's execution have been disabled. */ | |
247 | ||
491144b5 CB |
248 | bool observer_mode = false; |
249 | static bool observer_mode_1 = false; | |
d914c394 SS |
250 | |
251 | static void | |
eb4c3f4a | 252 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
253 | struct cmd_list_element *c) |
254 | { | |
d914c394 SS |
255 | if (target_has_execution) |
256 | { | |
257 | observer_mode_1 = observer_mode; | |
258 | error (_("Cannot change this setting while the inferior is running.")); | |
259 | } | |
260 | ||
261 | observer_mode = observer_mode_1; | |
262 | ||
263 | may_write_registers = !observer_mode; | |
264 | may_write_memory = !observer_mode; | |
265 | may_insert_breakpoints = !observer_mode; | |
266 | may_insert_tracepoints = !observer_mode; | |
267 | /* We can insert fast tracepoints in or out of observer mode, | |
268 | but enable them if we're going into this mode. */ | |
269 | if (observer_mode) | |
491144b5 | 270 | may_insert_fast_tracepoints = true; |
d914c394 SS |
271 | may_stop = !observer_mode; |
272 | update_target_permissions (); | |
273 | ||
274 | /* Going *into* observer mode we must force non-stop, then | |
275 | going out we leave it that way. */ | |
276 | if (observer_mode) | |
277 | { | |
d914c394 | 278 | pagination_enabled = 0; |
491144b5 | 279 | non_stop = non_stop_1 = true; |
d914c394 SS |
280 | } |
281 | ||
282 | if (from_tty) | |
283 | printf_filtered (_("Observer mode is now %s.\n"), | |
284 | (observer_mode ? "on" : "off")); | |
285 | } | |
286 | ||
287 | static void | |
288 | show_observer_mode (struct ui_file *file, int from_tty, | |
289 | struct cmd_list_element *c, const char *value) | |
290 | { | |
291 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
292 | } | |
293 | ||
294 | /* This updates the value of observer mode based on changes in | |
295 | permissions. Note that we are deliberately ignoring the values of | |
296 | may-write-registers and may-write-memory, since the user may have | |
297 | reason to enable these during a session, for instance to turn on a | |
298 | debugging-related global. */ | |
299 | ||
300 | void | |
301 | update_observer_mode (void) | |
302 | { | |
491144b5 CB |
303 | bool newval = (!may_insert_breakpoints |
304 | && !may_insert_tracepoints | |
305 | && may_insert_fast_tracepoints | |
306 | && !may_stop | |
307 | && non_stop); | |
d914c394 SS |
308 | |
309 | /* Let the user know if things change. */ | |
310 | if (newval != observer_mode) | |
311 | printf_filtered (_("Observer mode is now %s.\n"), | |
312 | (newval ? "on" : "off")); | |
313 | ||
314 | observer_mode = observer_mode_1 = newval; | |
315 | } | |
c2c6d25f | 316 | |
c906108c SS |
317 | /* Tables of how to react to signals; the user sets them. */ |
318 | ||
adc6a863 PA |
319 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
320 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
321 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 322 | |
ab04a2af TT |
323 | /* Table of signals that are registered with "catch signal". A |
324 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
325 | signal" command. */ |
326 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 327 | |
2455069d UW |
328 | /* Table of signals that the target may silently handle. |
329 | This is automatically determined from the flags above, | |
330 | and simply cached here. */ | |
adc6a863 | 331 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 332 | |
c906108c SS |
333 | #define SET_SIGS(nsigs,sigs,flags) \ |
334 | do { \ | |
335 | int signum = (nsigs); \ | |
336 | while (signum-- > 0) \ | |
337 | if ((sigs)[signum]) \ | |
338 | (flags)[signum] = 1; \ | |
339 | } while (0) | |
340 | ||
341 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
342 | do { \ | |
343 | int signum = (nsigs); \ | |
344 | while (signum-- > 0) \ | |
345 | if ((sigs)[signum]) \ | |
346 | (flags)[signum] = 0; \ | |
347 | } while (0) | |
348 | ||
9b224c5e PA |
349 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
350 | this function is to avoid exporting `signal_program'. */ | |
351 | ||
352 | void | |
353 | update_signals_program_target (void) | |
354 | { | |
adc6a863 | 355 | target_program_signals (signal_program); |
9b224c5e PA |
356 | } |
357 | ||
1777feb0 | 358 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 359 | |
edb3359d | 360 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
361 | |
362 | /* Command list pointer for the "stop" placeholder. */ | |
363 | ||
364 | static struct cmd_list_element *stop_command; | |
365 | ||
c906108c SS |
366 | /* Nonzero if we want to give control to the user when we're notified |
367 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 368 | int stop_on_solib_events; |
f9e14852 GB |
369 | |
370 | /* Enable or disable optional shared library event breakpoints | |
371 | as appropriate when the above flag is changed. */ | |
372 | ||
373 | static void | |
eb4c3f4a TT |
374 | set_stop_on_solib_events (const char *args, |
375 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
376 | { |
377 | update_solib_breakpoints (); | |
378 | } | |
379 | ||
920d2a44 AC |
380 | static void |
381 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
382 | struct cmd_list_element *c, const char *value) | |
383 | { | |
384 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
385 | value); | |
386 | } | |
c906108c | 387 | |
c906108c SS |
388 | /* Nonzero after stop if current stack frame should be printed. */ |
389 | ||
390 | static int stop_print_frame; | |
391 | ||
5b6d1e4f PA |
392 | /* This is a cached copy of the target/ptid/waitstatus of the last |
393 | event returned by target_wait()/deprecated_target_wait_hook(). | |
394 | This information is returned by get_last_target_status(). */ | |
395 | static process_stratum_target *target_last_proc_target; | |
39f77062 | 396 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
397 | static struct target_waitstatus target_last_waitstatus; |
398 | ||
4e1c45ea | 399 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 400 | |
53904c9e AC |
401 | static const char follow_fork_mode_child[] = "child"; |
402 | static const char follow_fork_mode_parent[] = "parent"; | |
403 | ||
40478521 | 404 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
405 | follow_fork_mode_child, |
406 | follow_fork_mode_parent, | |
407 | NULL | |
ef346e04 | 408 | }; |
c906108c | 409 | |
53904c9e | 410 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
411 | static void |
412 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
413 | struct cmd_list_element *c, const char *value) | |
414 | { | |
3e43a32a MS |
415 | fprintf_filtered (file, |
416 | _("Debugger response to a program " | |
417 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
418 | value); |
419 | } | |
c906108c SS |
420 | \f |
421 | ||
d83ad864 DB |
422 | /* Handle changes to the inferior list based on the type of fork, |
423 | which process is being followed, and whether the other process | |
424 | should be detached. On entry inferior_ptid must be the ptid of | |
425 | the fork parent. At return inferior_ptid is the ptid of the | |
426 | followed inferior. */ | |
427 | ||
5ab2fbf1 SM |
428 | static bool |
429 | follow_fork_inferior (bool follow_child, bool detach_fork) | |
d83ad864 DB |
430 | { |
431 | int has_vforked; | |
79639e11 | 432 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
433 | |
434 | has_vforked = (inferior_thread ()->pending_follow.kind | |
435 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
436 | parent_ptid = inferior_ptid; |
437 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
438 | |
439 | if (has_vforked | |
440 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 441 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
442 | && !(follow_child || detach_fork || sched_multi)) |
443 | { | |
444 | /* The parent stays blocked inside the vfork syscall until the | |
445 | child execs or exits. If we don't let the child run, then | |
446 | the parent stays blocked. If we're telling the parent to run | |
447 | in the foreground, the user will not be able to ctrl-c to get | |
448 | back the terminal, effectively hanging the debug session. */ | |
449 | fprintf_filtered (gdb_stderr, _("\ | |
450 | Can not resume the parent process over vfork in the foreground while\n\ | |
451 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
452 | \"set schedule-multiple\".\n")); | |
d83ad864 DB |
453 | return 1; |
454 | } | |
455 | ||
456 | if (!follow_child) | |
457 | { | |
458 | /* Detach new forked process? */ | |
459 | if (detach_fork) | |
460 | { | |
d83ad864 DB |
461 | /* Before detaching from the child, remove all breakpoints |
462 | from it. If we forked, then this has already been taken | |
463 | care of by infrun.c. If we vforked however, any | |
464 | breakpoint inserted in the parent is visible in the | |
465 | child, even those added while stopped in a vfork | |
466 | catchpoint. This will remove the breakpoints from the | |
467 | parent also, but they'll be reinserted below. */ | |
468 | if (has_vforked) | |
469 | { | |
470 | /* Keep breakpoints list in sync. */ | |
00431a78 | 471 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
472 | } |
473 | ||
f67c0c91 | 474 | if (print_inferior_events) |
d83ad864 | 475 | { |
8dd06f7a | 476 | /* Ensure that we have a process ptid. */ |
e99b03dc | 477 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 478 | |
223ffa71 | 479 | target_terminal::ours_for_output (); |
d83ad864 | 480 | fprintf_filtered (gdb_stdlog, |
f67c0c91 | 481 | _("[Detaching after %s from child %s]\n"), |
6f259a23 | 482 | has_vforked ? "vfork" : "fork", |
a068643d | 483 | target_pid_to_str (process_ptid).c_str ()); |
d83ad864 DB |
484 | } |
485 | } | |
486 | else | |
487 | { | |
488 | struct inferior *parent_inf, *child_inf; | |
d83ad864 DB |
489 | |
490 | /* Add process to GDB's tables. */ | |
e99b03dc | 491 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
492 | |
493 | parent_inf = current_inferior (); | |
494 | child_inf->attach_flag = parent_inf->attach_flag; | |
495 | copy_terminal_info (child_inf, parent_inf); | |
496 | child_inf->gdbarch = parent_inf->gdbarch; | |
497 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
498 | ||
5ed8105e | 499 | scoped_restore_current_pspace_and_thread restore_pspace_thread; |
d83ad864 | 500 | |
2a00d7ce | 501 | set_current_inferior (child_inf); |
5b6d1e4f | 502 | switch_to_no_thread (); |
d83ad864 | 503 | child_inf->symfile_flags = SYMFILE_NO_READ; |
5b6d1e4f PA |
504 | push_target (parent_inf->process_target ()); |
505 | add_thread_silent (child_inf->process_target (), child_ptid); | |
506 | inferior_ptid = child_ptid; | |
d83ad864 DB |
507 | |
508 | /* If this is a vfork child, then the address-space is | |
509 | shared with the parent. */ | |
510 | if (has_vforked) | |
511 | { | |
512 | child_inf->pspace = parent_inf->pspace; | |
513 | child_inf->aspace = parent_inf->aspace; | |
514 | ||
5b6d1e4f PA |
515 | exec_on_vfork (); |
516 | ||
d83ad864 DB |
517 | /* The parent will be frozen until the child is done |
518 | with the shared region. Keep track of the | |
519 | parent. */ | |
520 | child_inf->vfork_parent = parent_inf; | |
521 | child_inf->pending_detach = 0; | |
522 | parent_inf->vfork_child = child_inf; | |
523 | parent_inf->pending_detach = 0; | |
524 | } | |
525 | else | |
526 | { | |
527 | child_inf->aspace = new_address_space (); | |
564b1e3f | 528 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
529 | child_inf->removable = 1; |
530 | set_current_program_space (child_inf->pspace); | |
531 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
532 | ||
533 | /* Let the shared library layer (e.g., solib-svr4) learn | |
534 | about this new process, relocate the cloned exec, pull | |
535 | in shared libraries, and install the solib event | |
536 | breakpoint. If a "cloned-VM" event was propagated | |
537 | better throughout the core, this wouldn't be | |
538 | required. */ | |
539 | solib_create_inferior_hook (0); | |
540 | } | |
d83ad864 DB |
541 | } |
542 | ||
543 | if (has_vforked) | |
544 | { | |
545 | struct inferior *parent_inf; | |
546 | ||
547 | parent_inf = current_inferior (); | |
548 | ||
549 | /* If we detached from the child, then we have to be careful | |
550 | to not insert breakpoints in the parent until the child | |
551 | is done with the shared memory region. However, if we're | |
552 | staying attached to the child, then we can and should | |
553 | insert breakpoints, so that we can debug it. A | |
554 | subsequent child exec or exit is enough to know when does | |
555 | the child stops using the parent's address space. */ | |
556 | parent_inf->waiting_for_vfork_done = detach_fork; | |
557 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
558 | } | |
559 | } | |
560 | else | |
561 | { | |
562 | /* Follow the child. */ | |
563 | struct inferior *parent_inf, *child_inf; | |
564 | struct program_space *parent_pspace; | |
565 | ||
f67c0c91 | 566 | if (print_inferior_events) |
d83ad864 | 567 | { |
f67c0c91 SDJ |
568 | std::string parent_pid = target_pid_to_str (parent_ptid); |
569 | std::string child_pid = target_pid_to_str (child_ptid); | |
570 | ||
223ffa71 | 571 | target_terminal::ours_for_output (); |
6f259a23 | 572 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
573 | _("[Attaching after %s %s to child %s]\n"), |
574 | parent_pid.c_str (), | |
6f259a23 | 575 | has_vforked ? "vfork" : "fork", |
f67c0c91 | 576 | child_pid.c_str ()); |
d83ad864 DB |
577 | } |
578 | ||
579 | /* Add the new inferior first, so that the target_detach below | |
580 | doesn't unpush the target. */ | |
581 | ||
e99b03dc | 582 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
583 | |
584 | parent_inf = current_inferior (); | |
585 | child_inf->attach_flag = parent_inf->attach_flag; | |
586 | copy_terminal_info (child_inf, parent_inf); | |
587 | child_inf->gdbarch = parent_inf->gdbarch; | |
588 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
589 | ||
590 | parent_pspace = parent_inf->pspace; | |
591 | ||
5b6d1e4f | 592 | process_stratum_target *target = parent_inf->process_target (); |
d83ad864 | 593 | |
5b6d1e4f PA |
594 | { |
595 | /* Hold a strong reference to the target while (maybe) | |
596 | detaching the parent. Otherwise detaching could close the | |
597 | target. */ | |
598 | auto target_ref = target_ops_ref::new_reference (target); | |
599 | ||
600 | /* If we're vforking, we want to hold on to the parent until | |
601 | the child exits or execs. At child exec or exit time we | |
602 | can remove the old breakpoints from the parent and detach | |
603 | or resume debugging it. Otherwise, detach the parent now; | |
604 | we'll want to reuse it's program/address spaces, but we | |
605 | can't set them to the child before removing breakpoints | |
606 | from the parent, otherwise, the breakpoints module could | |
607 | decide to remove breakpoints from the wrong process (since | |
608 | they'd be assigned to the same address space). */ | |
609 | ||
610 | if (has_vforked) | |
611 | { | |
612 | gdb_assert (child_inf->vfork_parent == NULL); | |
613 | gdb_assert (parent_inf->vfork_child == NULL); | |
614 | child_inf->vfork_parent = parent_inf; | |
615 | child_inf->pending_detach = 0; | |
616 | parent_inf->vfork_child = child_inf; | |
617 | parent_inf->pending_detach = detach_fork; | |
618 | parent_inf->waiting_for_vfork_done = 0; | |
619 | } | |
620 | else if (detach_fork) | |
621 | { | |
622 | if (print_inferior_events) | |
623 | { | |
624 | /* Ensure that we have a process ptid. */ | |
625 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
626 | ||
627 | target_terminal::ours_for_output (); | |
628 | fprintf_filtered (gdb_stdlog, | |
629 | _("[Detaching after fork from " | |
630 | "parent %s]\n"), | |
631 | target_pid_to_str (process_ptid).c_str ()); | |
632 | } | |
8dd06f7a | 633 | |
5b6d1e4f PA |
634 | target_detach (parent_inf, 0); |
635 | parent_inf = NULL; | |
636 | } | |
6f259a23 | 637 | |
5b6d1e4f | 638 | /* Note that the detach above makes PARENT_INF dangling. */ |
d83ad864 | 639 | |
5b6d1e4f PA |
640 | /* Add the child thread to the appropriate lists, and switch |
641 | to this new thread, before cloning the program space, and | |
642 | informing the solib layer about this new process. */ | |
d83ad864 | 643 | |
5b6d1e4f PA |
644 | set_current_inferior (child_inf); |
645 | push_target (target); | |
646 | } | |
d83ad864 | 647 | |
5b6d1e4f | 648 | add_thread_silent (target, child_ptid); |
79639e11 | 649 | inferior_ptid = child_ptid; |
d83ad864 DB |
650 | |
651 | /* If this is a vfork child, then the address-space is shared | |
652 | with the parent. If we detached from the parent, then we can | |
653 | reuse the parent's program/address spaces. */ | |
654 | if (has_vforked || detach_fork) | |
655 | { | |
656 | child_inf->pspace = parent_pspace; | |
657 | child_inf->aspace = child_inf->pspace->aspace; | |
5b6d1e4f PA |
658 | |
659 | exec_on_vfork (); | |
d83ad864 DB |
660 | } |
661 | else | |
662 | { | |
663 | child_inf->aspace = new_address_space (); | |
564b1e3f | 664 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
665 | child_inf->removable = 1; |
666 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
667 | set_current_program_space (child_inf->pspace); | |
668 | clone_program_space (child_inf->pspace, parent_pspace); | |
669 | ||
670 | /* Let the shared library layer (e.g., solib-svr4) learn | |
671 | about this new process, relocate the cloned exec, pull in | |
672 | shared libraries, and install the solib event breakpoint. | |
673 | If a "cloned-VM" event was propagated better throughout | |
674 | the core, this wouldn't be required. */ | |
675 | solib_create_inferior_hook (0); | |
676 | } | |
677 | } | |
678 | ||
679 | return target_follow_fork (follow_child, detach_fork); | |
680 | } | |
681 | ||
e58b0e63 PA |
682 | /* Tell the target to follow the fork we're stopped at. Returns true |
683 | if the inferior should be resumed; false, if the target for some | |
684 | reason decided it's best not to resume. */ | |
685 | ||
5ab2fbf1 SM |
686 | static bool |
687 | follow_fork () | |
c906108c | 688 | { |
5ab2fbf1 SM |
689 | bool follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
690 | bool should_resume = true; | |
e58b0e63 PA |
691 | struct thread_info *tp; |
692 | ||
693 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
694 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
695 | parent thread structure's run control related fields, not just these. |
696 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
697 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 698 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
699 | CORE_ADDR step_range_start = 0; |
700 | CORE_ADDR step_range_end = 0; | |
bf4cb9be TV |
701 | int current_line = 0; |
702 | symtab *current_symtab = NULL; | |
4e3990f4 | 703 | struct frame_id step_frame_id = { 0 }; |
8980e177 | 704 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
705 | |
706 | if (!non_stop) | |
707 | { | |
5b6d1e4f | 708 | process_stratum_target *wait_target; |
e58b0e63 PA |
709 | ptid_t wait_ptid; |
710 | struct target_waitstatus wait_status; | |
711 | ||
712 | /* Get the last target status returned by target_wait(). */ | |
5b6d1e4f | 713 | get_last_target_status (&wait_target, &wait_ptid, &wait_status); |
e58b0e63 PA |
714 | |
715 | /* If not stopped at a fork event, then there's nothing else to | |
716 | do. */ | |
717 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
718 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
719 | return 1; | |
720 | ||
721 | /* Check if we switched over from WAIT_PTID, since the event was | |
722 | reported. */ | |
00431a78 | 723 | if (wait_ptid != minus_one_ptid |
5b6d1e4f PA |
724 | && (current_inferior ()->process_target () != wait_target |
725 | || inferior_ptid != wait_ptid)) | |
e58b0e63 PA |
726 | { |
727 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
728 | target to follow it (in either direction). We'll | |
729 | afterwards refuse to resume, and inform the user what | |
730 | happened. */ | |
5b6d1e4f | 731 | thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid); |
00431a78 | 732 | switch_to_thread (wait_thread); |
5ab2fbf1 | 733 | should_resume = false; |
e58b0e63 PA |
734 | } |
735 | } | |
736 | ||
737 | tp = inferior_thread (); | |
738 | ||
739 | /* If there were any forks/vforks that were caught and are now to be | |
740 | followed, then do so now. */ | |
741 | switch (tp->pending_follow.kind) | |
742 | { | |
743 | case TARGET_WAITKIND_FORKED: | |
744 | case TARGET_WAITKIND_VFORKED: | |
745 | { | |
746 | ptid_t parent, child; | |
747 | ||
748 | /* If the user did a next/step, etc, over a fork call, | |
749 | preserve the stepping state in the fork child. */ | |
750 | if (follow_child && should_resume) | |
751 | { | |
8358c15c JK |
752 | step_resume_breakpoint = clone_momentary_breakpoint |
753 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
754 | step_range_start = tp->control.step_range_start; |
755 | step_range_end = tp->control.step_range_end; | |
bf4cb9be TV |
756 | current_line = tp->current_line; |
757 | current_symtab = tp->current_symtab; | |
16c381f0 | 758 | step_frame_id = tp->control.step_frame_id; |
186c406b TT |
759 | exception_resume_breakpoint |
760 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 761 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
762 | |
763 | /* For now, delete the parent's sr breakpoint, otherwise, | |
764 | parent/child sr breakpoints are considered duplicates, | |
765 | and the child version will not be installed. Remove | |
766 | this when the breakpoints module becomes aware of | |
767 | inferiors and address spaces. */ | |
768 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
769 | tp->control.step_range_start = 0; |
770 | tp->control.step_range_end = 0; | |
771 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 772 | delete_exception_resume_breakpoint (tp); |
8980e177 | 773 | tp->thread_fsm = NULL; |
e58b0e63 PA |
774 | } |
775 | ||
776 | parent = inferior_ptid; | |
777 | child = tp->pending_follow.value.related_pid; | |
778 | ||
5b6d1e4f | 779 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
780 | /* Set up inferior(s) as specified by the caller, and tell the |
781 | target to do whatever is necessary to follow either parent | |
782 | or child. */ | |
783 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
784 | { |
785 | /* Target refused to follow, or there's some other reason | |
786 | we shouldn't resume. */ | |
787 | should_resume = 0; | |
788 | } | |
789 | else | |
790 | { | |
791 | /* This pending follow fork event is now handled, one way | |
792 | or another. The previous selected thread may be gone | |
793 | from the lists by now, but if it is still around, need | |
794 | to clear the pending follow request. */ | |
5b6d1e4f | 795 | tp = find_thread_ptid (parent_targ, parent); |
e58b0e63 PA |
796 | if (tp) |
797 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
798 | ||
799 | /* This makes sure we don't try to apply the "Switched | |
800 | over from WAIT_PID" logic above. */ | |
801 | nullify_last_target_wait_ptid (); | |
802 | ||
1777feb0 | 803 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
804 | if (follow_child) |
805 | { | |
5b6d1e4f | 806 | thread_info *child_thr = find_thread_ptid (parent_targ, child); |
00431a78 | 807 | switch_to_thread (child_thr); |
e58b0e63 PA |
808 | |
809 | /* ... and preserve the stepping state, in case the | |
810 | user was stepping over the fork call. */ | |
811 | if (should_resume) | |
812 | { | |
813 | tp = inferior_thread (); | |
8358c15c JK |
814 | tp->control.step_resume_breakpoint |
815 | = step_resume_breakpoint; | |
16c381f0 JK |
816 | tp->control.step_range_start = step_range_start; |
817 | tp->control.step_range_end = step_range_end; | |
bf4cb9be TV |
818 | tp->current_line = current_line; |
819 | tp->current_symtab = current_symtab; | |
16c381f0 | 820 | tp->control.step_frame_id = step_frame_id; |
186c406b TT |
821 | tp->control.exception_resume_breakpoint |
822 | = exception_resume_breakpoint; | |
8980e177 | 823 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
824 | } |
825 | else | |
826 | { | |
827 | /* If we get here, it was because we're trying to | |
828 | resume from a fork catchpoint, but, the user | |
829 | has switched threads away from the thread that | |
830 | forked. In that case, the resume command | |
831 | issued is most likely not applicable to the | |
832 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 833 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 834 | "before following fork child.")); |
e58b0e63 PA |
835 | } |
836 | ||
837 | /* Reset breakpoints in the child as appropriate. */ | |
838 | follow_inferior_reset_breakpoints (); | |
839 | } | |
e58b0e63 PA |
840 | } |
841 | } | |
842 | break; | |
843 | case TARGET_WAITKIND_SPURIOUS: | |
844 | /* Nothing to follow. */ | |
845 | break; | |
846 | default: | |
847 | internal_error (__FILE__, __LINE__, | |
848 | "Unexpected pending_follow.kind %d\n", | |
849 | tp->pending_follow.kind); | |
850 | break; | |
851 | } | |
c906108c | 852 | |
e58b0e63 | 853 | return should_resume; |
c906108c SS |
854 | } |
855 | ||
d83ad864 | 856 | static void |
6604731b | 857 | follow_inferior_reset_breakpoints (void) |
c906108c | 858 | { |
4e1c45ea PA |
859 | struct thread_info *tp = inferior_thread (); |
860 | ||
6604731b DJ |
861 | /* Was there a step_resume breakpoint? (There was if the user |
862 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
863 | thread number. Cloned step_resume breakpoints are disabled on |
864 | creation, so enable it here now that it is associated with the | |
865 | correct thread. | |
6604731b DJ |
866 | |
867 | step_resumes are a form of bp that are made to be per-thread. | |
868 | Since we created the step_resume bp when the parent process | |
869 | was being debugged, and now are switching to the child process, | |
870 | from the breakpoint package's viewpoint, that's a switch of | |
871 | "threads". We must update the bp's notion of which thread | |
872 | it is for, or it'll be ignored when it triggers. */ | |
873 | ||
8358c15c | 874 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
875 | { |
876 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
877 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
878 | } | |
6604731b | 879 | |
a1aa2221 | 880 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 881 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
882 | { |
883 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
884 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
885 | } | |
186c406b | 886 | |
6604731b DJ |
887 | /* Reinsert all breakpoints in the child. The user may have set |
888 | breakpoints after catching the fork, in which case those | |
889 | were never set in the child, but only in the parent. This makes | |
890 | sure the inserted breakpoints match the breakpoint list. */ | |
891 | ||
892 | breakpoint_re_set (); | |
893 | insert_breakpoints (); | |
c906108c | 894 | } |
c906108c | 895 | |
6c95b8df PA |
896 | /* The child has exited or execed: resume threads of the parent the |
897 | user wanted to be executing. */ | |
898 | ||
899 | static int | |
900 | proceed_after_vfork_done (struct thread_info *thread, | |
901 | void *arg) | |
902 | { | |
903 | int pid = * (int *) arg; | |
904 | ||
00431a78 PA |
905 | if (thread->ptid.pid () == pid |
906 | && thread->state == THREAD_RUNNING | |
907 | && !thread->executing | |
6c95b8df | 908 | && !thread->stop_requested |
a493e3e2 | 909 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df | 910 | { |
4100594e SM |
911 | infrun_log_debug ("resuming vfork parent thread %s", |
912 | target_pid_to_str (thread->ptid).c_str ()); | |
6c95b8df | 913 | |
00431a78 | 914 | switch_to_thread (thread); |
70509625 | 915 | clear_proceed_status (0); |
64ce06e4 | 916 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
917 | } |
918 | ||
919 | return 0; | |
920 | } | |
921 | ||
5ed8105e PA |
922 | /* Save/restore inferior_ptid, current program space and current |
923 | inferior. Only use this if the current context points at an exited | |
924 | inferior (and therefore there's no current thread to save). */ | |
925 | class scoped_restore_exited_inferior | |
926 | { | |
927 | public: | |
928 | scoped_restore_exited_inferior () | |
929 | : m_saved_ptid (&inferior_ptid) | |
930 | {} | |
931 | ||
932 | private: | |
933 | scoped_restore_tmpl<ptid_t> m_saved_ptid; | |
934 | scoped_restore_current_program_space m_pspace; | |
935 | scoped_restore_current_inferior m_inferior; | |
936 | }; | |
937 | ||
6c95b8df PA |
938 | /* Called whenever we notice an exec or exit event, to handle |
939 | detaching or resuming a vfork parent. */ | |
940 | ||
941 | static void | |
942 | handle_vfork_child_exec_or_exit (int exec) | |
943 | { | |
944 | struct inferior *inf = current_inferior (); | |
945 | ||
946 | if (inf->vfork_parent) | |
947 | { | |
948 | int resume_parent = -1; | |
949 | ||
950 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
951 | between the parent and the child. Break the bonds. */ |
952 | inferior *vfork_parent = inf->vfork_parent; | |
953 | inf->vfork_parent->vfork_child = NULL; | |
954 | inf->vfork_parent = NULL; | |
6c95b8df | 955 | |
b73715df TV |
956 | /* If the user wanted to detach from the parent, now is the |
957 | time. */ | |
958 | if (vfork_parent->pending_detach) | |
6c95b8df PA |
959 | { |
960 | struct thread_info *tp; | |
6c95b8df PA |
961 | struct program_space *pspace; |
962 | struct address_space *aspace; | |
963 | ||
1777feb0 | 964 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 965 | |
b73715df | 966 | vfork_parent->pending_detach = 0; |
68c9da30 | 967 | |
5ed8105e PA |
968 | gdb::optional<scoped_restore_exited_inferior> |
969 | maybe_restore_inferior; | |
970 | gdb::optional<scoped_restore_current_pspace_and_thread> | |
971 | maybe_restore_thread; | |
972 | ||
973 | /* If we're handling a child exit, then inferior_ptid points | |
974 | at the inferior's pid, not to a thread. */ | |
f50f4e56 | 975 | if (!exec) |
5ed8105e | 976 | maybe_restore_inferior.emplace (); |
f50f4e56 | 977 | else |
5ed8105e | 978 | maybe_restore_thread.emplace (); |
6c95b8df PA |
979 | |
980 | /* We're letting loose of the parent. */ | |
b73715df | 981 | tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 982 | switch_to_thread (tp); |
6c95b8df PA |
983 | |
984 | /* We're about to detach from the parent, which implicitly | |
985 | removes breakpoints from its address space. There's a | |
986 | catch here: we want to reuse the spaces for the child, | |
987 | but, parent/child are still sharing the pspace at this | |
988 | point, although the exec in reality makes the kernel give | |
989 | the child a fresh set of new pages. The problem here is | |
990 | that the breakpoints module being unaware of this, would | |
991 | likely chose the child process to write to the parent | |
992 | address space. Swapping the child temporarily away from | |
993 | the spaces has the desired effect. Yes, this is "sort | |
994 | of" a hack. */ | |
995 | ||
996 | pspace = inf->pspace; | |
997 | aspace = inf->aspace; | |
998 | inf->aspace = NULL; | |
999 | inf->pspace = NULL; | |
1000 | ||
f67c0c91 | 1001 | if (print_inferior_events) |
6c95b8df | 1002 | { |
a068643d | 1003 | std::string pidstr |
b73715df | 1004 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 1005 | |
223ffa71 | 1006 | target_terminal::ours_for_output (); |
6c95b8df PA |
1007 | |
1008 | if (exec) | |
6f259a23 DB |
1009 | { |
1010 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 1011 | _("[Detaching vfork parent %s " |
a068643d | 1012 | "after child exec]\n"), pidstr.c_str ()); |
6f259a23 | 1013 | } |
6c95b8df | 1014 | else |
6f259a23 DB |
1015 | { |
1016 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 1017 | _("[Detaching vfork parent %s " |
a068643d | 1018 | "after child exit]\n"), pidstr.c_str ()); |
6f259a23 | 1019 | } |
6c95b8df PA |
1020 | } |
1021 | ||
b73715df | 1022 | target_detach (vfork_parent, 0); |
6c95b8df PA |
1023 | |
1024 | /* Put it back. */ | |
1025 | inf->pspace = pspace; | |
1026 | inf->aspace = aspace; | |
6c95b8df PA |
1027 | } |
1028 | else if (exec) | |
1029 | { | |
1030 | /* We're staying attached to the parent, so, really give the | |
1031 | child a new address space. */ | |
564b1e3f | 1032 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
1033 | inf->aspace = inf->pspace->aspace; |
1034 | inf->removable = 1; | |
1035 | set_current_program_space (inf->pspace); | |
1036 | ||
b73715df | 1037 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1038 | } |
1039 | else | |
1040 | { | |
6c95b8df PA |
1041 | /* If this is a vfork child exiting, then the pspace and |
1042 | aspaces were shared with the parent. Since we're | |
1043 | reporting the process exit, we'll be mourning all that is | |
1044 | found in the address space, and switching to null_ptid, | |
1045 | preparing to start a new inferior. But, since we don't | |
1046 | want to clobber the parent's address/program spaces, we | |
1047 | go ahead and create a new one for this exiting | |
1048 | inferior. */ | |
1049 | ||
5ed8105e PA |
1050 | /* Switch to null_ptid while running clone_program_space, so |
1051 | that clone_program_space doesn't want to read the | |
1052 | selected frame of a dead process. */ | |
1053 | scoped_restore restore_ptid | |
1054 | = make_scoped_restore (&inferior_ptid, null_ptid); | |
6c95b8df | 1055 | |
53af73bf PA |
1056 | inf->pspace = new program_space (maybe_new_address_space ()); |
1057 | inf->aspace = inf->pspace->aspace; | |
1058 | set_current_program_space (inf->pspace); | |
6c95b8df | 1059 | inf->removable = 1; |
7dcd53a0 | 1060 | inf->symfile_flags = SYMFILE_NO_READ; |
53af73bf | 1061 | clone_program_space (inf->pspace, vfork_parent->pspace); |
6c95b8df | 1062 | |
b73715df | 1063 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1064 | } |
1065 | ||
6c95b8df PA |
1066 | gdb_assert (current_program_space == inf->pspace); |
1067 | ||
1068 | if (non_stop && resume_parent != -1) | |
1069 | { | |
1070 | /* If the user wanted the parent to be running, let it go | |
1071 | free now. */ | |
5ed8105e | 1072 | scoped_restore_current_thread restore_thread; |
6c95b8df | 1073 | |
4100594e SM |
1074 | infrun_log_debug ("resuming vfork parent process %d", |
1075 | resume_parent); | |
6c95b8df PA |
1076 | |
1077 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1078 | } |
1079 | } | |
1080 | } | |
1081 | ||
eb6c553b | 1082 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1083 | |
1084 | static const char follow_exec_mode_new[] = "new"; | |
1085 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1086 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1087 | { |
1088 | follow_exec_mode_new, | |
1089 | follow_exec_mode_same, | |
1090 | NULL, | |
1091 | }; | |
1092 | ||
1093 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1094 | static void | |
1095 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1096 | struct cmd_list_element *c, const char *value) | |
1097 | { | |
1098 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1099 | } | |
1100 | ||
ecf45d2c | 1101 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1102 | |
c906108c | 1103 | static void |
4ca51187 | 1104 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1105 | { |
6c95b8df | 1106 | struct inferior *inf = current_inferior (); |
e99b03dc | 1107 | int pid = ptid.pid (); |
94585166 | 1108 | ptid_t process_ptid; |
7a292a7a | 1109 | |
65d2b333 PW |
1110 | /* Switch terminal for any messages produced e.g. by |
1111 | breakpoint_re_set. */ | |
1112 | target_terminal::ours_for_output (); | |
1113 | ||
c906108c SS |
1114 | /* This is an exec event that we actually wish to pay attention to. |
1115 | Refresh our symbol table to the newly exec'd program, remove any | |
1116 | momentary bp's, etc. | |
1117 | ||
1118 | If there are breakpoints, they aren't really inserted now, | |
1119 | since the exec() transformed our inferior into a fresh set | |
1120 | of instructions. | |
1121 | ||
1122 | We want to preserve symbolic breakpoints on the list, since | |
1123 | we have hopes that they can be reset after the new a.out's | |
1124 | symbol table is read. | |
1125 | ||
1126 | However, any "raw" breakpoints must be removed from the list | |
1127 | (e.g., the solib bp's), since their address is probably invalid | |
1128 | now. | |
1129 | ||
1130 | And, we DON'T want to call delete_breakpoints() here, since | |
1131 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1132 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1133 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1134 | |
1135 | mark_breakpoints_out (); | |
1136 | ||
95e50b27 PA |
1137 | /* The target reports the exec event to the main thread, even if |
1138 | some other thread does the exec, and even if the main thread was | |
1139 | stopped or already gone. We may still have non-leader threads of | |
1140 | the process on our list. E.g., on targets that don't have thread | |
1141 | exit events (like remote); or on native Linux in non-stop mode if | |
1142 | there were only two threads in the inferior and the non-leader | |
1143 | one is the one that execs (and nothing forces an update of the | |
1144 | thread list up to here). When debugging remotely, it's best to | |
1145 | avoid extra traffic, when possible, so avoid syncing the thread | |
1146 | list with the target, and instead go ahead and delete all threads | |
1147 | of the process but one that reported the event. Note this must | |
1148 | be done before calling update_breakpoints_after_exec, as | |
1149 | otherwise clearing the threads' resources would reference stale | |
1150 | thread breakpoints -- it may have been one of these threads that | |
1151 | stepped across the exec. We could just clear their stepping | |
1152 | states, but as long as we're iterating, might as well delete | |
1153 | them. Deleting them now rather than at the next user-visible | |
1154 | stop provides a nicer sequence of events for user and MI | |
1155 | notifications. */ | |
08036331 | 1156 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1157 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1158 | delete_thread (th); |
95e50b27 PA |
1159 | |
1160 | /* We also need to clear any left over stale state for the | |
1161 | leader/event thread. E.g., if there was any step-resume | |
1162 | breakpoint or similar, it's gone now. We cannot truly | |
1163 | step-to-next statement through an exec(). */ | |
08036331 | 1164 | thread_info *th = inferior_thread (); |
8358c15c | 1165 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1166 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1167 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1168 | th->control.step_range_start = 0; |
1169 | th->control.step_range_end = 0; | |
c906108c | 1170 | |
95e50b27 PA |
1171 | /* The user may have had the main thread held stopped in the |
1172 | previous image (e.g., schedlock on, or non-stop). Release | |
1173 | it now. */ | |
a75724bc PA |
1174 | th->stop_requested = 0; |
1175 | ||
95e50b27 PA |
1176 | update_breakpoints_after_exec (); |
1177 | ||
1777feb0 | 1178 | /* What is this a.out's name? */ |
f2907e49 | 1179 | process_ptid = ptid_t (pid); |
6c95b8df | 1180 | printf_unfiltered (_("%s is executing new program: %s\n"), |
a068643d | 1181 | target_pid_to_str (process_ptid).c_str (), |
ecf45d2c | 1182 | exec_file_target); |
c906108c SS |
1183 | |
1184 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1185 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1186 | |
6ca15a4b | 1187 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1188 | |
797bc1cb TT |
1189 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1190 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1191 | |
ecf45d2c SL |
1192 | /* If we were unable to map the executable target pathname onto a host |
1193 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1194 | is confusing. Maybe it would even be better to stop at this point | |
1195 | so that the user can specify a file manually before continuing. */ | |
1196 | if (exec_file_host == NULL) | |
1197 | warning (_("Could not load symbols for executable %s.\n" | |
1198 | "Do you need \"set sysroot\"?"), | |
1199 | exec_file_target); | |
c906108c | 1200 | |
cce9b6bf PA |
1201 | /* Reset the shared library package. This ensures that we get a |
1202 | shlib event when the child reaches "_start", at which point the | |
1203 | dld will have had a chance to initialize the child. */ | |
1204 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1205 | we don't want those to be satisfied by the libraries of the | |
1206 | previous incarnation of this process. */ | |
1207 | no_shared_libraries (NULL, 0); | |
1208 | ||
6c95b8df PA |
1209 | if (follow_exec_mode_string == follow_exec_mode_new) |
1210 | { | |
6c95b8df PA |
1211 | /* The user wants to keep the old inferior and program spaces |
1212 | around. Create a new fresh one, and switch to it. */ | |
1213 | ||
35ed81d4 SM |
1214 | /* Do exit processing for the original inferior before setting the new |
1215 | inferior's pid. Having two inferiors with the same pid would confuse | |
1216 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1217 | old to the new inferior. */ | |
1218 | inf = add_inferior_with_spaces (); | |
1219 | swap_terminal_info (inf, current_inferior ()); | |
057302ce | 1220 | exit_inferior_silent (current_inferior ()); |
17d8546e | 1221 | |
94585166 | 1222 | inf->pid = pid; |
ecf45d2c | 1223 | target_follow_exec (inf, exec_file_target); |
6c95b8df | 1224 | |
5b6d1e4f PA |
1225 | inferior *org_inferior = current_inferior (); |
1226 | switch_to_inferior_no_thread (inf); | |
1227 | push_target (org_inferior->process_target ()); | |
1228 | thread_info *thr = add_thread (inf->process_target (), ptid); | |
1229 | switch_to_thread (thr); | |
6c95b8df | 1230 | } |
9107fc8d PA |
1231 | else |
1232 | { | |
1233 | /* The old description may no longer be fit for the new image. | |
1234 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1235 | old description; we'll read a new one below. No need to do | |
1236 | this on "follow-exec-mode new", as the old inferior stays | |
1237 | around (its description is later cleared/refetched on | |
1238 | restart). */ | |
1239 | target_clear_description (); | |
1240 | } | |
6c95b8df PA |
1241 | |
1242 | gdb_assert (current_program_space == inf->pspace); | |
1243 | ||
ecf45d2c SL |
1244 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1245 | because the proper displacement for a PIE (Position Independent | |
1246 | Executable) main symbol file will only be computed by | |
1247 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1248 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1249 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1250 | |
9107fc8d PA |
1251 | /* If the target can specify a description, read it. Must do this |
1252 | after flipping to the new executable (because the target supplied | |
1253 | description must be compatible with the executable's | |
1254 | architecture, and the old executable may e.g., be 32-bit, while | |
1255 | the new one 64-bit), and before anything involving memory or | |
1256 | registers. */ | |
1257 | target_find_description (); | |
1258 | ||
268a4a75 | 1259 | solib_create_inferior_hook (0); |
c906108c | 1260 | |
4efc6507 DE |
1261 | jit_inferior_created_hook (); |
1262 | ||
c1e56572 JK |
1263 | breakpoint_re_set (); |
1264 | ||
c906108c SS |
1265 | /* Reinsert all breakpoints. (Those which were symbolic have |
1266 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1267 | to symbol_file_command...). */ |
c906108c SS |
1268 | insert_breakpoints (); |
1269 | ||
1270 | /* The next resume of this inferior should bring it to the shlib | |
1271 | startup breakpoints. (If the user had also set bp's on | |
1272 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1273 | matically get reset there in the new process.). */ |
c906108c SS |
1274 | } |
1275 | ||
c2829269 PA |
1276 | /* The queue of threads that need to do a step-over operation to get |
1277 | past e.g., a breakpoint. What technique is used to step over the | |
1278 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1279 | same queue, to maintain rough temporal order of execution, in order | |
1280 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1281 | constantly stepping the same couple threads past their breakpoints | |
1282 | over and over, if the single-step finish fast enough. */ | |
1283 | struct thread_info *step_over_queue_head; | |
1284 | ||
6c4cfb24 PA |
1285 | /* Bit flags indicating what the thread needs to step over. */ |
1286 | ||
8d297bbf | 1287 | enum step_over_what_flag |
6c4cfb24 PA |
1288 | { |
1289 | /* Step over a breakpoint. */ | |
1290 | STEP_OVER_BREAKPOINT = 1, | |
1291 | ||
1292 | /* Step past a non-continuable watchpoint, in order to let the | |
1293 | instruction execute so we can evaluate the watchpoint | |
1294 | expression. */ | |
1295 | STEP_OVER_WATCHPOINT = 2 | |
1296 | }; | |
8d297bbf | 1297 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1298 | |
963f9c80 | 1299 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1300 | |
1301 | struct step_over_info | |
1302 | { | |
963f9c80 PA |
1303 | /* If we're stepping past a breakpoint, this is the address space |
1304 | and address of the instruction the breakpoint is set at. We'll | |
1305 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1306 | non-NULL. */ | |
8b86c959 | 1307 | const address_space *aspace; |
31e77af2 | 1308 | CORE_ADDR address; |
963f9c80 PA |
1309 | |
1310 | /* The instruction being stepped over triggers a nonsteppable | |
1311 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1312 | int nonsteppable_watchpoint_p; | |
21edc42f YQ |
1313 | |
1314 | /* The thread's global number. */ | |
1315 | int thread; | |
31e77af2 PA |
1316 | }; |
1317 | ||
1318 | /* The step-over info of the location that is being stepped over. | |
1319 | ||
1320 | Note that with async/breakpoint always-inserted mode, a user might | |
1321 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1322 | being stepped over. As setting a new breakpoint inserts all | |
1323 | breakpoints, we need to make sure the breakpoint being stepped over | |
1324 | isn't inserted then. We do that by only clearing the step-over | |
1325 | info when the step-over is actually finished (or aborted). | |
1326 | ||
1327 | Presently GDB can only step over one breakpoint at any given time. | |
1328 | Given threads that can't run code in the same address space as the | |
1329 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1330 | to step-over at most one breakpoint per address space (so this info | |
1331 | could move to the address space object if/when GDB is extended). | |
1332 | The set of breakpoints being stepped over will normally be much | |
1333 | smaller than the set of all breakpoints, so a flag in the | |
1334 | breakpoint location structure would be wasteful. A separate list | |
1335 | also saves complexity and run-time, as otherwise we'd have to go | |
1336 | through all breakpoint locations clearing their flag whenever we | |
1337 | start a new sequence. Similar considerations weigh against storing | |
1338 | this info in the thread object. Plus, not all step overs actually | |
1339 | have breakpoint locations -- e.g., stepping past a single-step | |
1340 | breakpoint, or stepping to complete a non-continuable | |
1341 | watchpoint. */ | |
1342 | static struct step_over_info step_over_info; | |
1343 | ||
1344 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1345 | stepping over. |
1346 | N.B. We record the aspace and address now, instead of say just the thread, | |
1347 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1348 | |
1349 | static void | |
8b86c959 | 1350 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1351 | int nonsteppable_watchpoint_p, |
1352 | int thread) | |
31e77af2 PA |
1353 | { |
1354 | step_over_info.aspace = aspace; | |
1355 | step_over_info.address = address; | |
963f9c80 | 1356 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1357 | step_over_info.thread = thread; |
31e77af2 PA |
1358 | } |
1359 | ||
1360 | /* Called when we're not longer stepping over a breakpoint / an | |
1361 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1362 | ||
1363 | static void | |
1364 | clear_step_over_info (void) | |
1365 | { | |
4100594e | 1366 | infrun_log_debug ("clearing step over info"); |
31e77af2 PA |
1367 | step_over_info.aspace = NULL; |
1368 | step_over_info.address = 0; | |
963f9c80 | 1369 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1370 | step_over_info.thread = -1; |
31e77af2 PA |
1371 | } |
1372 | ||
7f89fd65 | 1373 | /* See infrun.h. */ |
31e77af2 PA |
1374 | |
1375 | int | |
1376 | stepping_past_instruction_at (struct address_space *aspace, | |
1377 | CORE_ADDR address) | |
1378 | { | |
1379 | return (step_over_info.aspace != NULL | |
1380 | && breakpoint_address_match (aspace, address, | |
1381 | step_over_info.aspace, | |
1382 | step_over_info.address)); | |
1383 | } | |
1384 | ||
963f9c80 PA |
1385 | /* See infrun.h. */ |
1386 | ||
21edc42f YQ |
1387 | int |
1388 | thread_is_stepping_over_breakpoint (int thread) | |
1389 | { | |
1390 | return (step_over_info.thread != -1 | |
1391 | && thread == step_over_info.thread); | |
1392 | } | |
1393 | ||
1394 | /* See infrun.h. */ | |
1395 | ||
963f9c80 PA |
1396 | int |
1397 | stepping_past_nonsteppable_watchpoint (void) | |
1398 | { | |
1399 | return step_over_info.nonsteppable_watchpoint_p; | |
1400 | } | |
1401 | ||
6cc83d2a PA |
1402 | /* Returns true if step-over info is valid. */ |
1403 | ||
1404 | static int | |
1405 | step_over_info_valid_p (void) | |
1406 | { | |
963f9c80 PA |
1407 | return (step_over_info.aspace != NULL |
1408 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1409 | } |
1410 | ||
c906108c | 1411 | \f |
237fc4c9 PA |
1412 | /* Displaced stepping. */ |
1413 | ||
1414 | /* In non-stop debugging mode, we must take special care to manage | |
1415 | breakpoints properly; in particular, the traditional strategy for | |
1416 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1417 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1418 | breakpoint it has hit while ensuring that other threads running | |
1419 | concurrently will hit the breakpoint as they should. | |
1420 | ||
1421 | The traditional way to step a thread T off a breakpoint in a | |
1422 | multi-threaded program in all-stop mode is as follows: | |
1423 | ||
1424 | a0) Initially, all threads are stopped, and breakpoints are not | |
1425 | inserted. | |
1426 | a1) We single-step T, leaving breakpoints uninserted. | |
1427 | a2) We insert breakpoints, and resume all threads. | |
1428 | ||
1429 | In non-stop debugging, however, this strategy is unsuitable: we | |
1430 | don't want to have to stop all threads in the system in order to | |
1431 | continue or step T past a breakpoint. Instead, we use displaced | |
1432 | stepping: | |
1433 | ||
1434 | n0) Initially, T is stopped, other threads are running, and | |
1435 | breakpoints are inserted. | |
1436 | n1) We copy the instruction "under" the breakpoint to a separate | |
1437 | location, outside the main code stream, making any adjustments | |
1438 | to the instruction, register, and memory state as directed by | |
1439 | T's architecture. | |
1440 | n2) We single-step T over the instruction at its new location. | |
1441 | n3) We adjust the resulting register and memory state as directed | |
1442 | by T's architecture. This includes resetting T's PC to point | |
1443 | back into the main instruction stream. | |
1444 | n4) We resume T. | |
1445 | ||
1446 | This approach depends on the following gdbarch methods: | |
1447 | ||
1448 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1449 | indicate where to copy the instruction, and how much space must | |
1450 | be reserved there. We use these in step n1. | |
1451 | ||
1452 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1453 | address, and makes any necessary adjustments to the instruction, | |
1454 | register contents, and memory. We use this in step n1. | |
1455 | ||
1456 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1457 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1458 | same effect the instruction would have had if we had executed it |
1459 | at its original address. We use this in step n3. | |
1460 | ||
237fc4c9 PA |
1461 | The gdbarch_displaced_step_copy_insn and |
1462 | gdbarch_displaced_step_fixup functions must be written so that | |
1463 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1464 | single-stepping across the copied instruction, and then applying | |
1465 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1466 | thread's memory and registers as stepping the instruction in place | |
1467 | would have. Exactly which responsibilities fall to the copy and | |
1468 | which fall to the fixup is up to the author of those functions. | |
1469 | ||
1470 | See the comments in gdbarch.sh for details. | |
1471 | ||
1472 | Note that displaced stepping and software single-step cannot | |
1473 | currently be used in combination, although with some care I think | |
1474 | they could be made to. Software single-step works by placing | |
1475 | breakpoints on all possible subsequent instructions; if the | |
1476 | displaced instruction is a PC-relative jump, those breakpoints | |
1477 | could fall in very strange places --- on pages that aren't | |
1478 | executable, or at addresses that are not proper instruction | |
1479 | boundaries. (We do generally let other threads run while we wait | |
1480 | to hit the software single-step breakpoint, and they might | |
1481 | encounter such a corrupted instruction.) One way to work around | |
1482 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1483 | simulate the effect of PC-relative instructions (and return NULL) | |
1484 | on architectures that use software single-stepping. | |
1485 | ||
1486 | In non-stop mode, we can have independent and simultaneous step | |
1487 | requests, so more than one thread may need to simultaneously step | |
1488 | over a breakpoint. The current implementation assumes there is | |
1489 | only one scratch space per process. In this case, we have to | |
1490 | serialize access to the scratch space. If thread A wants to step | |
1491 | over a breakpoint, but we are currently waiting for some other | |
1492 | thread to complete a displaced step, we leave thread A stopped and | |
1493 | place it in the displaced_step_request_queue. Whenever a displaced | |
1494 | step finishes, we pick the next thread in the queue and start a new | |
1495 | displaced step operation on it. See displaced_step_prepare and | |
1496 | displaced_step_fixup for details. */ | |
1497 | ||
cfba9872 SM |
1498 | /* Default destructor for displaced_step_closure. */ |
1499 | ||
1500 | displaced_step_closure::~displaced_step_closure () = default; | |
1501 | ||
fc1cf338 PA |
1502 | /* Get the displaced stepping state of process PID. */ |
1503 | ||
39a36629 | 1504 | static displaced_step_inferior_state * |
00431a78 | 1505 | get_displaced_stepping_state (inferior *inf) |
fc1cf338 | 1506 | { |
d20172fc | 1507 | return &inf->displaced_step_state; |
fc1cf338 PA |
1508 | } |
1509 | ||
372316f1 PA |
1510 | /* Returns true if any inferior has a thread doing a displaced |
1511 | step. */ | |
1512 | ||
39a36629 SM |
1513 | static bool |
1514 | displaced_step_in_progress_any_inferior () | |
372316f1 | 1515 | { |
d20172fc | 1516 | for (inferior *i : all_inferiors ()) |
39a36629 | 1517 | { |
d20172fc | 1518 | if (i->displaced_step_state.step_thread != nullptr) |
39a36629 SM |
1519 | return true; |
1520 | } | |
372316f1 | 1521 | |
39a36629 | 1522 | return false; |
372316f1 PA |
1523 | } |
1524 | ||
c0987663 YQ |
1525 | /* Return true if thread represented by PTID is doing a displaced |
1526 | step. */ | |
1527 | ||
1528 | static int | |
00431a78 | 1529 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1530 | { |
00431a78 | 1531 | gdb_assert (thread != NULL); |
c0987663 | 1532 | |
d20172fc | 1533 | return get_displaced_stepping_state (thread->inf)->step_thread == thread; |
c0987663 YQ |
1534 | } |
1535 | ||
8f572e5c PA |
1536 | /* Return true if process PID has a thread doing a displaced step. */ |
1537 | ||
1538 | static int | |
00431a78 | 1539 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1540 | { |
d20172fc | 1541 | return get_displaced_stepping_state (inf)->step_thread != nullptr; |
fc1cf338 PA |
1542 | } |
1543 | ||
a42244db YQ |
1544 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1545 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1546 | return NULL. */ | |
1547 | ||
1548 | struct displaced_step_closure* | |
1549 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1550 | { | |
d20172fc | 1551 | displaced_step_inferior_state *displaced |
00431a78 | 1552 | = get_displaced_stepping_state (current_inferior ()); |
a42244db YQ |
1553 | |
1554 | /* If checking the mode of displaced instruction in copy area. */ | |
d20172fc | 1555 | if (displaced->step_thread != nullptr |
00431a78 | 1556 | && displaced->step_copy == addr) |
d8d83535 | 1557 | return displaced->step_closure.get (); |
a42244db YQ |
1558 | |
1559 | return NULL; | |
1560 | } | |
1561 | ||
fc1cf338 PA |
1562 | static void |
1563 | infrun_inferior_exit (struct inferior *inf) | |
1564 | { | |
d20172fc | 1565 | inf->displaced_step_state.reset (); |
fc1cf338 | 1566 | } |
237fc4c9 | 1567 | |
fff08868 HZ |
1568 | /* If ON, and the architecture supports it, GDB will use displaced |
1569 | stepping to step over breakpoints. If OFF, or if the architecture | |
1570 | doesn't support it, GDB will instead use the traditional | |
1571 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1572 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1573 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1574 | |
72d0e2c5 | 1575 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1576 | |
237fc4c9 PA |
1577 | static void |
1578 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1579 | struct cmd_list_element *c, | |
1580 | const char *value) | |
1581 | { | |
72d0e2c5 | 1582 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1583 | fprintf_filtered (file, |
1584 | _("Debugger's willingness to use displaced stepping " | |
1585 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1586 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1587 | else |
3e43a32a MS |
1588 | fprintf_filtered (file, |
1589 | _("Debugger's willingness to use displaced stepping " | |
1590 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1591 | } |
1592 | ||
9822cb57 SM |
1593 | /* Return true if the gdbarch implements the required methods to use |
1594 | displaced stepping. */ | |
1595 | ||
1596 | static bool | |
1597 | gdbarch_supports_displaced_stepping (gdbarch *arch) | |
1598 | { | |
1599 | /* Only check for the presence of step_copy_insn. Other required methods | |
1600 | are checked by the gdbarch validation. */ | |
1601 | return gdbarch_displaced_step_copy_insn_p (arch); | |
1602 | } | |
1603 | ||
fff08868 | 1604 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1605 | over breakpoints of thread TP. */ |
fff08868 | 1606 | |
9822cb57 SM |
1607 | static bool |
1608 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1609 | { |
9822cb57 SM |
1610 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1611 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1612 | return false; | |
1613 | ||
1614 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1615 | way. */ | |
1616 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1617 | && !target_is_non_stop_p ()) | |
1618 | return false; | |
1619 | ||
1620 | gdbarch *gdbarch = get_thread_regcache (tp)->arch (); | |
1621 | ||
1622 | /* If the architecture doesn't implement displaced stepping, don't use | |
1623 | it. */ | |
1624 | if (!gdbarch_supports_displaced_stepping (gdbarch)) | |
1625 | return false; | |
1626 | ||
1627 | /* If recording, don't use displaced stepping. */ | |
1628 | if (find_record_target () != nullptr) | |
1629 | return false; | |
1630 | ||
d20172fc SM |
1631 | displaced_step_inferior_state *displaced_state |
1632 | = get_displaced_stepping_state (tp->inf); | |
3fc8eb30 | 1633 | |
9822cb57 SM |
1634 | /* If displaced stepping failed before for this inferior, don't bother trying |
1635 | again. */ | |
1636 | if (displaced_state->failed_before) | |
1637 | return false; | |
1638 | ||
1639 | return true; | |
237fc4c9 PA |
1640 | } |
1641 | ||
d8d83535 SM |
1642 | /* Simple function wrapper around displaced_step_inferior_state::reset. */ |
1643 | ||
237fc4c9 | 1644 | static void |
d8d83535 | 1645 | displaced_step_reset (displaced_step_inferior_state *displaced) |
237fc4c9 | 1646 | { |
d8d83535 | 1647 | displaced->reset (); |
237fc4c9 PA |
1648 | } |
1649 | ||
d8d83535 SM |
1650 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1651 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1652 | ||
1653 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 PA |
1654 | |
1655 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1656 | void | |
1657 | displaced_step_dump_bytes (struct ui_file *file, | |
1658 | const gdb_byte *buf, | |
1659 | size_t len) | |
1660 | { | |
1661 | int i; | |
1662 | ||
1663 | for (i = 0; i < len; i++) | |
1664 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1665 | fputs_unfiltered ("\n", file); | |
1666 | } | |
1667 | ||
1668 | /* Prepare to single-step, using displaced stepping. | |
1669 | ||
1670 | Note that we cannot use displaced stepping when we have a signal to | |
1671 | deliver. If we have a signal to deliver and an instruction to step | |
1672 | over, then after the step, there will be no indication from the | |
1673 | target whether the thread entered a signal handler or ignored the | |
1674 | signal and stepped over the instruction successfully --- both cases | |
1675 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1676 | fixup, and in the second case we must --- but we can't tell which. | |
1677 | Comments in the code for 'random signals' in handle_inferior_event | |
1678 | explain how we handle this case instead. | |
1679 | ||
1680 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1681 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1682 | if this instruction can't be displaced stepped. */ | |
1683 | ||
237fc4c9 | 1684 | static int |
00431a78 | 1685 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1686 | { |
00431a78 | 1687 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1688 | struct gdbarch *gdbarch = regcache->arch (); |
8b86c959 | 1689 | const address_space *aspace = regcache->aspace (); |
237fc4c9 PA |
1690 | CORE_ADDR original, copy; |
1691 | ULONGEST len; | |
9e529e1d | 1692 | int status; |
237fc4c9 PA |
1693 | |
1694 | /* We should never reach this function if the architecture does not | |
1695 | support displaced stepping. */ | |
9822cb57 | 1696 | gdb_assert (gdbarch_supports_displaced_stepping (gdbarch)); |
237fc4c9 | 1697 | |
c2829269 PA |
1698 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1699 | gdb_assert (tp->control.trap_expected); | |
1700 | ||
c1e36e3e PA |
1701 | /* Disable range stepping while executing in the scratch pad. We |
1702 | want a single-step even if executing the displaced instruction in | |
1703 | the scratch buffer lands within the stepping range (e.g., a | |
1704 | jump/branch). */ | |
1705 | tp->control.may_range_step = 0; | |
1706 | ||
fc1cf338 PA |
1707 | /* We have to displaced step one thread at a time, as we only have |
1708 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1709 | |
d20172fc SM |
1710 | displaced_step_inferior_state *displaced |
1711 | = get_displaced_stepping_state (tp->inf); | |
fc1cf338 | 1712 | |
00431a78 | 1713 | if (displaced->step_thread != nullptr) |
237fc4c9 PA |
1714 | { |
1715 | /* Already waiting for a displaced step to finish. Defer this | |
1716 | request and place in queue. */ | |
237fc4c9 PA |
1717 | |
1718 | if (debug_displaced) | |
1719 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1720 | "displaced: deferring step of %s\n", |
a068643d | 1721 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 | 1722 | |
c2829269 | 1723 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1724 | return 0; |
1725 | } | |
1726 | else | |
1727 | { | |
1728 | if (debug_displaced) | |
1729 | fprintf_unfiltered (gdb_stdlog, | |
1730 | "displaced: stepping %s now\n", | |
a068643d | 1731 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 PA |
1732 | } |
1733 | ||
d8d83535 | 1734 | displaced_step_reset (displaced); |
237fc4c9 | 1735 | |
00431a78 PA |
1736 | scoped_restore_current_thread restore_thread; |
1737 | ||
1738 | switch_to_thread (tp); | |
ad53cd71 | 1739 | |
515630c5 | 1740 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1741 | |
1742 | copy = gdbarch_displaced_step_location (gdbarch); | |
1743 | len = gdbarch_max_insn_length (gdbarch); | |
1744 | ||
d35ae833 PA |
1745 | if (breakpoint_in_range_p (aspace, copy, len)) |
1746 | { | |
1747 | /* There's a breakpoint set in the scratch pad location range | |
1748 | (which is usually around the entry point). We'd either | |
1749 | install it before resuming, which would overwrite/corrupt the | |
1750 | scratch pad, or if it was already inserted, this displaced | |
1751 | step would overwrite it. The latter is OK in the sense that | |
1752 | we already assume that no thread is going to execute the code | |
1753 | in the scratch pad range (after initial startup) anyway, but | |
1754 | the former is unacceptable. Simply punt and fallback to | |
1755 | stepping over this breakpoint in-line. */ | |
1756 | if (debug_displaced) | |
1757 | { | |
1758 | fprintf_unfiltered (gdb_stdlog, | |
1759 | "displaced: breakpoint set in scratch pad. " | |
1760 | "Stepping over breakpoint in-line instead.\n"); | |
1761 | } | |
1762 | ||
d35ae833 PA |
1763 | return -1; |
1764 | } | |
1765 | ||
237fc4c9 | 1766 | /* Save the original contents of the copy area. */ |
d20172fc SM |
1767 | displaced->step_saved_copy.resize (len); |
1768 | status = target_read_memory (copy, displaced->step_saved_copy.data (), len); | |
9e529e1d JK |
1769 | if (status != 0) |
1770 | throw_error (MEMORY_ERROR, | |
1771 | _("Error accessing memory address %s (%s) for " | |
1772 | "displaced-stepping scratch space."), | |
1773 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1774 | if (debug_displaced) |
1775 | { | |
5af949e3 UW |
1776 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1777 | paddress (gdbarch, copy)); | |
fc1cf338 | 1778 | displaced_step_dump_bytes (gdb_stdlog, |
d20172fc | 1779 | displaced->step_saved_copy.data (), |
fc1cf338 | 1780 | len); |
237fc4c9 PA |
1781 | }; |
1782 | ||
e8217e61 SM |
1783 | displaced->step_closure |
1784 | = gdbarch_displaced_step_copy_insn (gdbarch, original, copy, regcache); | |
1785 | if (displaced->step_closure == NULL) | |
7f03bd92 PA |
1786 | { |
1787 | /* The architecture doesn't know how or want to displaced step | |
1788 | this instruction or instruction sequence. Fallback to | |
1789 | stepping over the breakpoint in-line. */ | |
7f03bd92 PA |
1790 | return -1; |
1791 | } | |
237fc4c9 | 1792 | |
9f5a595d UW |
1793 | /* Save the information we need to fix things up if the step |
1794 | succeeds. */ | |
00431a78 | 1795 | displaced->step_thread = tp; |
fc1cf338 | 1796 | displaced->step_gdbarch = gdbarch; |
fc1cf338 PA |
1797 | displaced->step_original = original; |
1798 | displaced->step_copy = copy; | |
9f5a595d | 1799 | |
9799571e | 1800 | { |
d8d83535 | 1801 | displaced_step_reset_cleanup cleanup (displaced); |
237fc4c9 | 1802 | |
9799571e TT |
1803 | /* Resume execution at the copy. */ |
1804 | regcache_write_pc (regcache, copy); | |
237fc4c9 | 1805 | |
9799571e TT |
1806 | cleanup.release (); |
1807 | } | |
ad53cd71 | 1808 | |
237fc4c9 | 1809 | if (debug_displaced) |
5af949e3 UW |
1810 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1811 | paddress (gdbarch, copy)); | |
237fc4c9 | 1812 | |
237fc4c9 PA |
1813 | return 1; |
1814 | } | |
1815 | ||
3fc8eb30 PA |
1816 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1817 | attempts at displaced stepping if we get a memory error. */ | |
1818 | ||
1819 | static int | |
00431a78 | 1820 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 PA |
1821 | { |
1822 | int prepared = -1; | |
1823 | ||
a70b8144 | 1824 | try |
3fc8eb30 | 1825 | { |
00431a78 | 1826 | prepared = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1827 | } |
230d2906 | 1828 | catch (const gdb_exception_error &ex) |
3fc8eb30 PA |
1829 | { |
1830 | struct displaced_step_inferior_state *displaced_state; | |
1831 | ||
16b41842 PA |
1832 | if (ex.error != MEMORY_ERROR |
1833 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1834 | throw; |
3fc8eb30 | 1835 | |
4100594e SM |
1836 | infrun_log_debug ("caught exception, disabling displaced stepping: %s", |
1837 | ex.what ()); | |
3fc8eb30 PA |
1838 | |
1839 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1840 | "auto". */ | |
1841 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1842 | { | |
fd7dcb94 | 1843 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1844 | ex.what ()); |
3fc8eb30 PA |
1845 | } |
1846 | ||
1847 | /* Disable further displaced stepping attempts. */ | |
1848 | displaced_state | |
00431a78 | 1849 | = get_displaced_stepping_state (thread->inf); |
3fc8eb30 PA |
1850 | displaced_state->failed_before = 1; |
1851 | } | |
3fc8eb30 PA |
1852 | |
1853 | return prepared; | |
1854 | } | |
1855 | ||
237fc4c9 | 1856 | static void |
3e43a32a MS |
1857 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1858 | const gdb_byte *myaddr, int len) | |
237fc4c9 | 1859 | { |
2989a365 | 1860 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
abbb1732 | 1861 | |
237fc4c9 PA |
1862 | inferior_ptid = ptid; |
1863 | write_memory (memaddr, myaddr, len); | |
237fc4c9 PA |
1864 | } |
1865 | ||
e2d96639 YQ |
1866 | /* Restore the contents of the copy area for thread PTID. */ |
1867 | ||
1868 | static void | |
1869 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1870 | ptid_t ptid) | |
1871 | { | |
1872 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1873 | ||
1874 | write_memory_ptid (ptid, displaced->step_copy, | |
d20172fc | 1875 | displaced->step_saved_copy.data (), len); |
e2d96639 YQ |
1876 | if (debug_displaced) |
1877 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
a068643d | 1878 | target_pid_to_str (ptid).c_str (), |
e2d96639 YQ |
1879 | paddress (displaced->step_gdbarch, |
1880 | displaced->step_copy)); | |
1881 | } | |
1882 | ||
372316f1 PA |
1883 | /* If we displaced stepped an instruction successfully, adjust |
1884 | registers and memory to yield the same effect the instruction would | |
1885 | have had if we had executed it at its original address, and return | |
1886 | 1. If the instruction didn't complete, relocate the PC and return | |
1887 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1888 | ||
1889 | static int | |
00431a78 | 1890 | displaced_step_fixup (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1891 | { |
fc1cf338 | 1892 | struct displaced_step_inferior_state *displaced |
00431a78 | 1893 | = get_displaced_stepping_state (event_thread->inf); |
372316f1 | 1894 | int ret; |
fc1cf338 | 1895 | |
00431a78 PA |
1896 | /* Was this event for the thread we displaced? */ |
1897 | if (displaced->step_thread != event_thread) | |
372316f1 | 1898 | return 0; |
237fc4c9 | 1899 | |
cb71640d PA |
1900 | /* Fixup may need to read memory/registers. Switch to the thread |
1901 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
d43b7a2d TBA |
1902 | the current thread, and displaced_step_restore performs ptid-dependent |
1903 | memory accesses using current_inferior() and current_top_target(). */ | |
00431a78 | 1904 | switch_to_thread (event_thread); |
cb71640d | 1905 | |
d43b7a2d TBA |
1906 | displaced_step_reset_cleanup cleanup (displaced); |
1907 | ||
1908 | displaced_step_restore (displaced, displaced->step_thread->ptid); | |
1909 | ||
237fc4c9 | 1910 | /* Did the instruction complete successfully? */ |
cb71640d PA |
1911 | if (signal == GDB_SIGNAL_TRAP |
1912 | && !(target_stopped_by_watchpoint () | |
1913 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
1914 | || target_have_steppable_watchpoint))) | |
237fc4c9 PA |
1915 | { |
1916 | /* Fix up the resulting state. */ | |
fc1cf338 | 1917 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
d8d83535 | 1918 | displaced->step_closure.get (), |
fc1cf338 PA |
1919 | displaced->step_original, |
1920 | displaced->step_copy, | |
00431a78 | 1921 | get_thread_regcache (displaced->step_thread)); |
372316f1 | 1922 | ret = 1; |
237fc4c9 PA |
1923 | } |
1924 | else | |
1925 | { | |
1926 | /* Since the instruction didn't complete, all we can do is | |
1927 | relocate the PC. */ | |
00431a78 | 1928 | struct regcache *regcache = get_thread_regcache (event_thread); |
515630c5 | 1929 | CORE_ADDR pc = regcache_read_pc (regcache); |
abbb1732 | 1930 | |
fc1cf338 | 1931 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1932 | regcache_write_pc (regcache, pc); |
372316f1 | 1933 | ret = -1; |
237fc4c9 PA |
1934 | } |
1935 | ||
372316f1 | 1936 | return ret; |
c2829269 | 1937 | } |
1c5cfe86 | 1938 | |
4d9d9d04 PA |
1939 | /* Data to be passed around while handling an event. This data is |
1940 | discarded between events. */ | |
1941 | struct execution_control_state | |
1942 | { | |
5b6d1e4f | 1943 | process_stratum_target *target; |
4d9d9d04 PA |
1944 | ptid_t ptid; |
1945 | /* The thread that got the event, if this was a thread event; NULL | |
1946 | otherwise. */ | |
1947 | struct thread_info *event_thread; | |
1948 | ||
1949 | struct target_waitstatus ws; | |
1950 | int stop_func_filled_in; | |
1951 | CORE_ADDR stop_func_start; | |
1952 | CORE_ADDR stop_func_end; | |
1953 | const char *stop_func_name; | |
1954 | int wait_some_more; | |
1955 | ||
1956 | /* True if the event thread hit the single-step breakpoint of | |
1957 | another thread. Thus the event doesn't cause a stop, the thread | |
1958 | needs to be single-stepped past the single-step breakpoint before | |
1959 | we can switch back to the original stepping thread. */ | |
1960 | int hit_singlestep_breakpoint; | |
1961 | }; | |
1962 | ||
1963 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1964 | |
1965 | static void | |
4d9d9d04 PA |
1966 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1967 | { | |
1968 | memset (ecs, 0, sizeof (*ecs)); | |
1969 | ecs->event_thread = tp; | |
1970 | ecs->ptid = tp->ptid; | |
1971 | } | |
1972 | ||
1973 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1974 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 1975 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1976 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1977 | |
1978 | /* Are there any pending step-over requests? If so, run all we can | |
1979 | now and return true. Otherwise, return false. */ | |
1980 | ||
1981 | static int | |
c2829269 PA |
1982 | start_step_over (void) |
1983 | { | |
1984 | struct thread_info *tp, *next; | |
1985 | ||
372316f1 PA |
1986 | /* Don't start a new step-over if we already have an in-line |
1987 | step-over operation ongoing. */ | |
1988 | if (step_over_info_valid_p ()) | |
1989 | return 0; | |
1990 | ||
c2829269 | 1991 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 1992 | { |
4d9d9d04 PA |
1993 | struct execution_control_state ecss; |
1994 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1995 | step_over_what step_what; |
372316f1 | 1996 | int must_be_in_line; |
c2829269 | 1997 | |
c65d6b55 PA |
1998 | gdb_assert (!tp->stop_requested); |
1999 | ||
c2829269 | 2000 | next = thread_step_over_chain_next (tp); |
237fc4c9 | 2001 | |
c2829269 PA |
2002 | /* If this inferior already has a displaced step in process, |
2003 | don't start a new one. */ | |
00431a78 | 2004 | if (displaced_step_in_progress (tp->inf)) |
c2829269 PA |
2005 | continue; |
2006 | ||
372316f1 PA |
2007 | step_what = thread_still_needs_step_over (tp); |
2008 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
2009 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 2010 | && !use_displaced_stepping (tp))); |
372316f1 PA |
2011 | |
2012 | /* We currently stop all threads of all processes to step-over | |
2013 | in-line. If we need to start a new in-line step-over, let | |
2014 | any pending displaced steps finish first. */ | |
2015 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
2016 | return 0; | |
2017 | ||
c2829269 PA |
2018 | thread_step_over_chain_remove (tp); |
2019 | ||
2020 | if (step_over_queue_head == NULL) | |
4100594e | 2021 | infrun_log_debug ("step-over queue now empty"); |
c2829269 | 2022 | |
372316f1 PA |
2023 | if (tp->control.trap_expected |
2024 | || tp->resumed | |
2025 | || tp->executing) | |
ad53cd71 | 2026 | { |
4d9d9d04 PA |
2027 | internal_error (__FILE__, __LINE__, |
2028 | "[%s] has inconsistent state: " | |
372316f1 | 2029 | "trap_expected=%d, resumed=%d, executing=%d\n", |
a068643d | 2030 | target_pid_to_str (tp->ptid).c_str (), |
4d9d9d04 | 2031 | tp->control.trap_expected, |
372316f1 | 2032 | tp->resumed, |
4d9d9d04 | 2033 | tp->executing); |
ad53cd71 | 2034 | } |
1c5cfe86 | 2035 | |
4100594e SM |
2036 | infrun_log_debug ("resuming [%s] for step-over", |
2037 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 PA |
2038 | |
2039 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2040 | is no longer inserted. In all-stop, we want to keep looking | |
2041 | for a thread that needs a step-over instead of resuming TP, | |
2042 | because we wouldn't be able to resume anything else until the | |
2043 | target stops again. In non-stop, the resume always resumes | |
2044 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2045 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2046 | continue; |
8550d3b3 | 2047 | |
00431a78 | 2048 | switch_to_thread (tp); |
4d9d9d04 PA |
2049 | reset_ecs (ecs, tp); |
2050 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2051 | |
4d9d9d04 PA |
2052 | if (!ecs->wait_some_more) |
2053 | error (_("Command aborted.")); | |
1c5cfe86 | 2054 | |
372316f1 PA |
2055 | gdb_assert (tp->resumed); |
2056 | ||
2057 | /* If we started a new in-line step-over, we're done. */ | |
2058 | if (step_over_info_valid_p ()) | |
2059 | { | |
2060 | gdb_assert (tp->control.trap_expected); | |
2061 | return 1; | |
2062 | } | |
2063 | ||
fbea99ea | 2064 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2065 | { |
2066 | /* On all-stop, shouldn't have resumed unless we needed a | |
2067 | step over. */ | |
2068 | gdb_assert (tp->control.trap_expected | |
2069 | || tp->step_after_step_resume_breakpoint); | |
2070 | ||
2071 | /* With remote targets (at least), in all-stop, we can't | |
2072 | issue any further remote commands until the program stops | |
2073 | again. */ | |
2074 | return 1; | |
1c5cfe86 | 2075 | } |
c2829269 | 2076 | |
4d9d9d04 PA |
2077 | /* Either the thread no longer needed a step-over, or a new |
2078 | displaced stepping sequence started. Even in the latter | |
2079 | case, continue looking. Maybe we can also start another | |
2080 | displaced step on a thread of other process. */ | |
237fc4c9 | 2081 | } |
4d9d9d04 PA |
2082 | |
2083 | return 0; | |
237fc4c9 PA |
2084 | } |
2085 | ||
5231c1fd PA |
2086 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2087 | holding OLD_PTID. */ | |
2088 | static void | |
2089 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2090 | { | |
d7e15655 | 2091 | if (inferior_ptid == old_ptid) |
5231c1fd | 2092 | inferior_ptid = new_ptid; |
5231c1fd PA |
2093 | } |
2094 | ||
237fc4c9 | 2095 | \f |
c906108c | 2096 | |
53904c9e AC |
2097 | static const char schedlock_off[] = "off"; |
2098 | static const char schedlock_on[] = "on"; | |
2099 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2100 | static const char schedlock_replay[] = "replay"; |
40478521 | 2101 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2102 | schedlock_off, |
2103 | schedlock_on, | |
2104 | schedlock_step, | |
f2665db5 | 2105 | schedlock_replay, |
ef346e04 AC |
2106 | NULL |
2107 | }; | |
f2665db5 | 2108 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2109 | static void |
2110 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2111 | struct cmd_list_element *c, const char *value) | |
2112 | { | |
3e43a32a MS |
2113 | fprintf_filtered (file, |
2114 | _("Mode for locking scheduler " | |
2115 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2116 | value); |
2117 | } | |
c906108c SS |
2118 | |
2119 | static void | |
eb4c3f4a | 2120 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2121 | { |
eefe576e AC |
2122 | if (!target_can_lock_scheduler) |
2123 | { | |
2124 | scheduler_mode = schedlock_off; | |
2125 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2126 | } | |
c906108c SS |
2127 | } |
2128 | ||
d4db2f36 PA |
2129 | /* True if execution commands resume all threads of all processes by |
2130 | default; otherwise, resume only threads of the current inferior | |
2131 | process. */ | |
491144b5 | 2132 | bool sched_multi = false; |
d4db2f36 | 2133 | |
2facfe5c DD |
2134 | /* Try to setup for software single stepping over the specified location. |
2135 | Return 1 if target_resume() should use hardware single step. | |
2136 | ||
2137 | GDBARCH the current gdbarch. | |
2138 | PC the location to step over. */ | |
2139 | ||
2140 | static int | |
2141 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2142 | { | |
2143 | int hw_step = 1; | |
2144 | ||
f02253f1 | 2145 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2146 | && gdbarch_software_single_step_p (gdbarch)) |
2147 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2148 | ||
2facfe5c DD |
2149 | return hw_step; |
2150 | } | |
c906108c | 2151 | |
f3263aa4 PA |
2152 | /* See infrun.h. */ |
2153 | ||
09cee04b PA |
2154 | ptid_t |
2155 | user_visible_resume_ptid (int step) | |
2156 | { | |
f3263aa4 | 2157 | ptid_t resume_ptid; |
09cee04b | 2158 | |
09cee04b PA |
2159 | if (non_stop) |
2160 | { | |
2161 | /* With non-stop mode on, threads are always handled | |
2162 | individually. */ | |
2163 | resume_ptid = inferior_ptid; | |
2164 | } | |
2165 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2166 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2167 | { |
f3263aa4 PA |
2168 | /* User-settable 'scheduler' mode requires solo thread |
2169 | resume. */ | |
09cee04b PA |
2170 | resume_ptid = inferior_ptid; |
2171 | } | |
f2665db5 MM |
2172 | else if ((scheduler_mode == schedlock_replay) |
2173 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2174 | { | |
2175 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2176 | mode. */ | |
2177 | resume_ptid = inferior_ptid; | |
2178 | } | |
f3263aa4 PA |
2179 | else if (!sched_multi && target_supports_multi_process ()) |
2180 | { | |
2181 | /* Resume all threads of the current process (and none of other | |
2182 | processes). */ | |
e99b03dc | 2183 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2184 | } |
2185 | else | |
2186 | { | |
2187 | /* Resume all threads of all processes. */ | |
2188 | resume_ptid = RESUME_ALL; | |
2189 | } | |
09cee04b PA |
2190 | |
2191 | return resume_ptid; | |
2192 | } | |
2193 | ||
5b6d1e4f PA |
2194 | /* See infrun.h. */ |
2195 | ||
2196 | process_stratum_target * | |
2197 | user_visible_resume_target (ptid_t resume_ptid) | |
2198 | { | |
2199 | return (resume_ptid == minus_one_ptid && sched_multi | |
2200 | ? NULL | |
2201 | : current_inferior ()->process_target ()); | |
2202 | } | |
2203 | ||
fbea99ea PA |
2204 | /* Return a ptid representing the set of threads that we will resume, |
2205 | in the perspective of the target, assuming run control handling | |
2206 | does not require leaving some threads stopped (e.g., stepping past | |
2207 | breakpoint). USER_STEP indicates whether we're about to start the | |
2208 | target for a stepping command. */ | |
2209 | ||
2210 | static ptid_t | |
2211 | internal_resume_ptid (int user_step) | |
2212 | { | |
2213 | /* In non-stop, we always control threads individually. Note that | |
2214 | the target may always work in non-stop mode even with "set | |
2215 | non-stop off", in which case user_visible_resume_ptid could | |
2216 | return a wildcard ptid. */ | |
2217 | if (target_is_non_stop_p ()) | |
2218 | return inferior_ptid; | |
2219 | else | |
2220 | return user_visible_resume_ptid (user_step); | |
2221 | } | |
2222 | ||
64ce06e4 PA |
2223 | /* Wrapper for target_resume, that handles infrun-specific |
2224 | bookkeeping. */ | |
2225 | ||
2226 | static void | |
2227 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2228 | { | |
2229 | struct thread_info *tp = inferior_thread (); | |
2230 | ||
c65d6b55 PA |
2231 | gdb_assert (!tp->stop_requested); |
2232 | ||
64ce06e4 | 2233 | /* Install inferior's terminal modes. */ |
223ffa71 | 2234 | target_terminal::inferior (); |
64ce06e4 PA |
2235 | |
2236 | /* Avoid confusing the next resume, if the next stop/resume | |
2237 | happens to apply to another thread. */ | |
2238 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2239 | ||
8f572e5c PA |
2240 | /* Advise target which signals may be handled silently. |
2241 | ||
2242 | If we have removed breakpoints because we are stepping over one | |
2243 | in-line (in any thread), we need to receive all signals to avoid | |
2244 | accidentally skipping a breakpoint during execution of a signal | |
2245 | handler. | |
2246 | ||
2247 | Likewise if we're displaced stepping, otherwise a trap for a | |
2248 | breakpoint in a signal handler might be confused with the | |
2249 | displaced step finishing. We don't make the displaced_step_fixup | |
2250 | step distinguish the cases instead, because: | |
2251 | ||
2252 | - a backtrace while stopped in the signal handler would show the | |
2253 | scratch pad as frame older than the signal handler, instead of | |
2254 | the real mainline code. | |
2255 | ||
2256 | - when the thread is later resumed, the signal handler would | |
2257 | return to the scratch pad area, which would no longer be | |
2258 | valid. */ | |
2259 | if (step_over_info_valid_p () | |
00431a78 | 2260 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2261 | target_pass_signals ({}); |
64ce06e4 | 2262 | else |
adc6a863 | 2263 | target_pass_signals (signal_pass); |
64ce06e4 PA |
2264 | |
2265 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2266 | |
2267 | target_commit_resume (); | |
5b6d1e4f PA |
2268 | |
2269 | if (target_can_async_p ()) | |
2270 | target_async (1); | |
64ce06e4 PA |
2271 | } |
2272 | ||
d930703d | 2273 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2274 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2275 | call 'resume', which handles exceptions. */ | |
c906108c | 2276 | |
71d378ae PA |
2277 | static void |
2278 | resume_1 (enum gdb_signal sig) | |
c906108c | 2279 | { |
515630c5 | 2280 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2281 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2282 | struct thread_info *tp = inferior_thread (); |
8b86c959 | 2283 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2284 | ptid_t resume_ptid; |
856e7dd6 PA |
2285 | /* This represents the user's step vs continue request. When |
2286 | deciding whether "set scheduler-locking step" applies, it's the | |
2287 | user's intention that counts. */ | |
2288 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2289 | /* This represents what we'll actually request the target to do. |
2290 | This can decay from a step to a continue, if e.g., we need to | |
2291 | implement single-stepping with breakpoints (software | |
2292 | single-step). */ | |
6b403daa | 2293 | int step; |
c7e8a53c | 2294 | |
c65d6b55 | 2295 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2296 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2297 | ||
372316f1 PA |
2298 | if (tp->suspend.waitstatus_pending_p) |
2299 | { | |
4100594e SM |
2300 | infrun_log_debug |
2301 | ("thread %s has pending wait " | |
2302 | "status %s (currently_stepping=%d).", | |
2303 | target_pid_to_str (tp->ptid).c_str (), | |
2304 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2305 | currently_stepping (tp)); | |
372316f1 | 2306 | |
5b6d1e4f | 2307 | tp->inf->process_target ()->threads_executing = true; |
719546c4 | 2308 | tp->resumed = true; |
372316f1 PA |
2309 | |
2310 | /* FIXME: What should we do if we are supposed to resume this | |
2311 | thread with a signal? Maybe we should maintain a queue of | |
2312 | pending signals to deliver. */ | |
2313 | if (sig != GDB_SIGNAL_0) | |
2314 | { | |
fd7dcb94 | 2315 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d TT |
2316 | gdb_signal_to_name (sig), |
2317 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2318 | } |
2319 | ||
2320 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2321 | |
2322 | if (target_can_async_p ()) | |
9516f85a AB |
2323 | { |
2324 | target_async (1); | |
2325 | /* Tell the event loop we have an event to process. */ | |
2326 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2327 | } | |
372316f1 PA |
2328 | return; |
2329 | } | |
2330 | ||
2331 | tp->stepped_breakpoint = 0; | |
2332 | ||
6b403daa PA |
2333 | /* Depends on stepped_breakpoint. */ |
2334 | step = currently_stepping (tp); | |
2335 | ||
74609e71 YQ |
2336 | if (current_inferior ()->waiting_for_vfork_done) |
2337 | { | |
48f9886d PA |
2338 | /* Don't try to single-step a vfork parent that is waiting for |
2339 | the child to get out of the shared memory region (by exec'ing | |
2340 | or exiting). This is particularly important on software | |
2341 | single-step archs, as the child process would trip on the | |
2342 | software single step breakpoint inserted for the parent | |
2343 | process. Since the parent will not actually execute any | |
2344 | instruction until the child is out of the shared region (such | |
2345 | are vfork's semantics), it is safe to simply continue it. | |
2346 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2347 | the parent, and tell it to `keep_going', which automatically | |
2348 | re-sets it stepping. */ | |
4100594e | 2349 | infrun_log_debug ("resume : clear step"); |
a09dd441 | 2350 | step = 0; |
74609e71 YQ |
2351 | } |
2352 | ||
7ca9b62a TBA |
2353 | CORE_ADDR pc = regcache_read_pc (regcache); |
2354 | ||
4100594e SM |
2355 | infrun_log_debug ("step=%d, signal=%s, trap_expected=%d, " |
2356 | "current thread [%s] at %s", | |
2357 | step, gdb_signal_to_symbol_string (sig), | |
2358 | tp->control.trap_expected, | |
2359 | target_pid_to_str (inferior_ptid).c_str (), | |
2360 | paddress (gdbarch, pc)); | |
c906108c | 2361 | |
c2c6d25f JM |
2362 | /* Normally, by the time we reach `resume', the breakpoints are either |
2363 | removed or inserted, as appropriate. The exception is if we're sitting | |
2364 | at a permanent breakpoint; we need to step over it, but permanent | |
2365 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2366 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2367 | { |
af48d08f PA |
2368 | if (sig != GDB_SIGNAL_0) |
2369 | { | |
2370 | /* We have a signal to pass to the inferior. The resume | |
2371 | may, or may not take us to the signal handler. If this | |
2372 | is a step, we'll need to stop in the signal handler, if | |
2373 | there's one, (if the target supports stepping into | |
2374 | handlers), or in the next mainline instruction, if | |
2375 | there's no handler. If this is a continue, we need to be | |
2376 | sure to run the handler with all breakpoints inserted. | |
2377 | In all cases, set a breakpoint at the current address | |
2378 | (where the handler returns to), and once that breakpoint | |
2379 | is hit, resume skipping the permanent breakpoint. If | |
2380 | that breakpoint isn't hit, then we've stepped into the | |
2381 | signal handler (or hit some other event). We'll delete | |
2382 | the step-resume breakpoint then. */ | |
2383 | ||
4100594e SM |
2384 | infrun_log_debug ("resume: skipping permanent breakpoint, " |
2385 | "deliver signal first"); | |
af48d08f PA |
2386 | |
2387 | clear_step_over_info (); | |
2388 | tp->control.trap_expected = 0; | |
2389 | ||
2390 | if (tp->control.step_resume_breakpoint == NULL) | |
2391 | { | |
2392 | /* Set a "high-priority" step-resume, as we don't want | |
2393 | user breakpoints at PC to trigger (again) when this | |
2394 | hits. */ | |
2395 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2396 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2397 | ||
2398 | tp->step_after_step_resume_breakpoint = step; | |
2399 | } | |
2400 | ||
2401 | insert_breakpoints (); | |
2402 | } | |
2403 | else | |
2404 | { | |
2405 | /* There's no signal to pass, we can go ahead and skip the | |
2406 | permanent breakpoint manually. */ | |
4100594e | 2407 | infrun_log_debug ("skipping permanent breakpoint"); |
af48d08f PA |
2408 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); |
2409 | /* Update pc to reflect the new address from which we will | |
2410 | execute instructions. */ | |
2411 | pc = regcache_read_pc (regcache); | |
2412 | ||
2413 | if (step) | |
2414 | { | |
2415 | /* We've already advanced the PC, so the stepping part | |
2416 | is done. Now we need to arrange for a trap to be | |
2417 | reported to handle_inferior_event. Set a breakpoint | |
2418 | at the current PC, and run to it. Don't update | |
2419 | prev_pc, because if we end in | |
44a1ee51 PA |
2420 | switch_back_to_stepped_thread, we want the "expected |
2421 | thread advanced also" branch to be taken. IOW, we | |
2422 | don't want this thread to step further from PC | |
af48d08f | 2423 | (overstep). */ |
1ac806b8 | 2424 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2425 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2426 | insert_breakpoints (); | |
2427 | ||
fbea99ea | 2428 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2429 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
719546c4 | 2430 | tp->resumed = true; |
af48d08f PA |
2431 | return; |
2432 | } | |
2433 | } | |
6d350bb5 | 2434 | } |
c2c6d25f | 2435 | |
c1e36e3e PA |
2436 | /* If we have a breakpoint to step over, make sure to do a single |
2437 | step only. Same if we have software watchpoints. */ | |
2438 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2439 | tp->control.may_range_step = 0; | |
2440 | ||
7da6a5b9 LM |
2441 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2442 | copy of the instruction at a different address. | |
237fc4c9 PA |
2443 | |
2444 | We can't use displaced stepping when we have a signal to deliver; | |
2445 | the comments for displaced_step_prepare explain why. The | |
2446 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2447 | signals' explain what we do instead. |
2448 | ||
2449 | We can't use displaced stepping when we are waiting for vfork_done | |
2450 | event, displaced stepping breaks the vfork child similarly as single | |
2451 | step software breakpoint. */ | |
3fc8eb30 PA |
2452 | if (tp->control.trap_expected |
2453 | && use_displaced_stepping (tp) | |
cb71640d | 2454 | && !step_over_info_valid_p () |
a493e3e2 | 2455 | && sig == GDB_SIGNAL_0 |
74609e71 | 2456 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2457 | { |
00431a78 | 2458 | int prepared = displaced_step_prepare (tp); |
fc1cf338 | 2459 | |
3fc8eb30 | 2460 | if (prepared == 0) |
d56b7306 | 2461 | { |
4100594e | 2462 | infrun_log_debug ("Got placed in step-over queue"); |
4d9d9d04 PA |
2463 | |
2464 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2465 | return; |
2466 | } | |
3fc8eb30 PA |
2467 | else if (prepared < 0) |
2468 | { | |
2469 | /* Fallback to stepping over the breakpoint in-line. */ | |
2470 | ||
2471 | if (target_is_non_stop_p ()) | |
2472 | stop_all_threads (); | |
2473 | ||
a01bda52 | 2474 | set_step_over_info (regcache->aspace (), |
21edc42f | 2475 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2476 | |
2477 | step = maybe_software_singlestep (gdbarch, pc); | |
2478 | ||
2479 | insert_breakpoints (); | |
2480 | } | |
2481 | else if (prepared > 0) | |
2482 | { | |
2483 | struct displaced_step_inferior_state *displaced; | |
99e40580 | 2484 | |
3fc8eb30 PA |
2485 | /* Update pc to reflect the new address from which we will |
2486 | execute instructions due to displaced stepping. */ | |
00431a78 | 2487 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2488 | |
00431a78 | 2489 | displaced = get_displaced_stepping_state (tp->inf); |
d8d83535 SM |
2490 | step = gdbarch_displaced_step_hw_singlestep |
2491 | (gdbarch, displaced->step_closure.get ()); | |
3fc8eb30 | 2492 | } |
237fc4c9 PA |
2493 | } |
2494 | ||
2facfe5c | 2495 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2496 | else if (step) |
2facfe5c | 2497 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2498 | |
30852783 UW |
2499 | /* Currently, our software single-step implementation leads to different |
2500 | results than hardware single-stepping in one situation: when stepping | |
2501 | into delivering a signal which has an associated signal handler, | |
2502 | hardware single-step will stop at the first instruction of the handler, | |
2503 | while software single-step will simply skip execution of the handler. | |
2504 | ||
2505 | For now, this difference in behavior is accepted since there is no | |
2506 | easy way to actually implement single-stepping into a signal handler | |
2507 | without kernel support. | |
2508 | ||
2509 | However, there is one scenario where this difference leads to follow-on | |
2510 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2511 | and then single-stepping. In this case, the software single-step | |
2512 | behavior means that even if there is a *breakpoint* in the signal | |
2513 | handler, GDB still would not stop. | |
2514 | ||
2515 | Fortunately, we can at least fix this particular issue. We detect | |
2516 | here the case where we are about to deliver a signal while software | |
2517 | single-stepping with breakpoints removed. In this situation, we | |
2518 | revert the decisions to remove all breakpoints and insert single- | |
2519 | step breakpoints, and instead we install a step-resume breakpoint | |
2520 | at the current address, deliver the signal without stepping, and | |
2521 | once we arrive back at the step-resume breakpoint, actually step | |
2522 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2523 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2524 | && sig != GDB_SIGNAL_0 |
2525 | && step_over_info_valid_p ()) | |
30852783 UW |
2526 | { |
2527 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2528 | immediately after a handler returns, might already have |
30852783 UW |
2529 | a step-resume breakpoint set on the earlier handler. We cannot |
2530 | set another step-resume breakpoint; just continue on until the | |
2531 | original breakpoint is hit. */ | |
2532 | if (tp->control.step_resume_breakpoint == NULL) | |
2533 | { | |
2c03e5be | 2534 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2535 | tp->step_after_step_resume_breakpoint = 1; |
2536 | } | |
2537 | ||
34b7e8a6 | 2538 | delete_single_step_breakpoints (tp); |
30852783 | 2539 | |
31e77af2 | 2540 | clear_step_over_info (); |
30852783 | 2541 | tp->control.trap_expected = 0; |
31e77af2 PA |
2542 | |
2543 | insert_breakpoints (); | |
30852783 UW |
2544 | } |
2545 | ||
b0f16a3e SM |
2546 | /* If STEP is set, it's a request to use hardware stepping |
2547 | facilities. But in that case, we should never | |
2548 | use singlestep breakpoint. */ | |
34b7e8a6 | 2549 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2550 | |
fbea99ea | 2551 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2552 | if (tp->control.trap_expected) |
b0f16a3e SM |
2553 | { |
2554 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2555 | hit, either by single-stepping the thread with the breakpoint |
2556 | removed, or by displaced stepping, with the breakpoint inserted. | |
2557 | In the former case, we need to single-step only this thread, | |
2558 | and keep others stopped, as they can miss this breakpoint if | |
2559 | allowed to run. That's not really a problem for displaced | |
2560 | stepping, but, we still keep other threads stopped, in case | |
2561 | another thread is also stopped for a breakpoint waiting for | |
2562 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2563 | resume_ptid = inferior_ptid; |
2564 | } | |
fbea99ea PA |
2565 | else |
2566 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2567 | |
7f5ef605 PA |
2568 | if (execution_direction != EXEC_REVERSE |
2569 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2570 | { |
372316f1 PA |
2571 | /* There are two cases where we currently need to step a |
2572 | breakpoint instruction when we have a signal to deliver: | |
2573 | ||
2574 | - See handle_signal_stop where we handle random signals that | |
2575 | could take out us out of the stepping range. Normally, in | |
2576 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2577 | signal handler with a breakpoint at PC, but there are cases |
2578 | where we should _always_ single-step, even if we have a | |
2579 | step-resume breakpoint, like when a software watchpoint is | |
2580 | set. Assuming single-stepping and delivering a signal at the | |
2581 | same time would takes us to the signal handler, then we could | |
2582 | have removed the breakpoint at PC to step over it. However, | |
2583 | some hardware step targets (like e.g., Mac OS) can't step | |
2584 | into signal handlers, and for those, we need to leave the | |
2585 | breakpoint at PC inserted, as otherwise if the handler | |
2586 | recurses and executes PC again, it'll miss the breakpoint. | |
2587 | So we leave the breakpoint inserted anyway, but we need to | |
2588 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2589 | that adjust_pc_after_break doesn't end up confused. |
2590 | ||
2591 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2592 | in one thread after another thread that was stepping had been | |
2593 | momentarily paused for a step-over. When we re-resume the | |
2594 | stepping thread, it may be resumed from that address with a | |
2595 | breakpoint that hasn't trapped yet. Seen with | |
2596 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2597 | do displaced stepping. */ | |
2598 | ||
4100594e SM |
2599 | infrun_log_debug ("resume: [%s] stepped breakpoint", |
2600 | target_pid_to_str (tp->ptid).c_str ()); | |
7f5ef605 PA |
2601 | |
2602 | tp->stepped_breakpoint = 1; | |
2603 | ||
b0f16a3e SM |
2604 | /* Most targets can step a breakpoint instruction, thus |
2605 | executing it normally. But if this one cannot, just | |
2606 | continue and we will hit it anyway. */ | |
7f5ef605 | 2607 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2608 | step = 0; |
2609 | } | |
ef5cf84e | 2610 | |
b0f16a3e | 2611 | if (debug_displaced |
cb71640d | 2612 | && tp->control.trap_expected |
3fc8eb30 | 2613 | && use_displaced_stepping (tp) |
cb71640d | 2614 | && !step_over_info_valid_p ()) |
b0f16a3e | 2615 | { |
00431a78 | 2616 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2617 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2618 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2619 | gdb_byte buf[4]; | |
2620 | ||
2621 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2622 | paddress (resume_gdbarch, actual_pc)); | |
2623 | read_memory (actual_pc, buf, sizeof (buf)); | |
2624 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2625 | } | |
237fc4c9 | 2626 | |
b0f16a3e SM |
2627 | if (tp->control.may_range_step) |
2628 | { | |
2629 | /* If we're resuming a thread with the PC out of the step | |
2630 | range, then we're doing some nested/finer run control | |
2631 | operation, like stepping the thread out of the dynamic | |
2632 | linker or the displaced stepping scratch pad. We | |
2633 | shouldn't have allowed a range step then. */ | |
2634 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2635 | } | |
c1e36e3e | 2636 | |
64ce06e4 | 2637 | do_target_resume (resume_ptid, step, sig); |
719546c4 | 2638 | tp->resumed = true; |
c906108c | 2639 | } |
71d378ae PA |
2640 | |
2641 | /* Resume the inferior. SIG is the signal to give the inferior | |
2642 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2643 | rolls back state on error. */ | |
2644 | ||
aff4e175 | 2645 | static void |
71d378ae PA |
2646 | resume (gdb_signal sig) |
2647 | { | |
a70b8144 | 2648 | try |
71d378ae PA |
2649 | { |
2650 | resume_1 (sig); | |
2651 | } | |
230d2906 | 2652 | catch (const gdb_exception &ex) |
71d378ae PA |
2653 | { |
2654 | /* If resuming is being aborted for any reason, delete any | |
2655 | single-step breakpoint resume_1 may have created, to avoid | |
2656 | confusing the following resumption, and to avoid leaving | |
2657 | single-step breakpoints perturbing other threads, in case | |
2658 | we're running in non-stop mode. */ | |
2659 | if (inferior_ptid != null_ptid) | |
2660 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2661 | throw; |
71d378ae | 2662 | } |
71d378ae PA |
2663 | } |
2664 | ||
c906108c | 2665 | \f |
237fc4c9 | 2666 | /* Proceeding. */ |
c906108c | 2667 | |
4c2f2a79 PA |
2668 | /* See infrun.h. */ |
2669 | ||
2670 | /* Counter that tracks number of user visible stops. This can be used | |
2671 | to tell whether a command has proceeded the inferior past the | |
2672 | current location. This allows e.g., inferior function calls in | |
2673 | breakpoint commands to not interrupt the command list. When the | |
2674 | call finishes successfully, the inferior is standing at the same | |
2675 | breakpoint as if nothing happened (and so we don't call | |
2676 | normal_stop). */ | |
2677 | static ULONGEST current_stop_id; | |
2678 | ||
2679 | /* See infrun.h. */ | |
2680 | ||
2681 | ULONGEST | |
2682 | get_stop_id (void) | |
2683 | { | |
2684 | return current_stop_id; | |
2685 | } | |
2686 | ||
2687 | /* Called when we report a user visible stop. */ | |
2688 | ||
2689 | static void | |
2690 | new_stop_id (void) | |
2691 | { | |
2692 | current_stop_id++; | |
2693 | } | |
2694 | ||
c906108c SS |
2695 | /* Clear out all variables saying what to do when inferior is continued. |
2696 | First do this, then set the ones you want, then call `proceed'. */ | |
2697 | ||
a7212384 UW |
2698 | static void |
2699 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2700 | { |
4100594e | 2701 | infrun_log_debug ("%s", target_pid_to_str (tp->ptid).c_str ()); |
d6b48e9c | 2702 | |
372316f1 PA |
2703 | /* If we're starting a new sequence, then the previous finished |
2704 | single-step is no longer relevant. */ | |
2705 | if (tp->suspend.waitstatus_pending_p) | |
2706 | { | |
2707 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2708 | { | |
4100594e SM |
2709 | infrun_log_debug ("pending event of %s was a finished step. " |
2710 | "Discarding.", | |
2711 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2712 | |
2713 | tp->suspend.waitstatus_pending_p = 0; | |
2714 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2715 | } | |
4100594e | 2716 | else |
372316f1 | 2717 | { |
4100594e SM |
2718 | infrun_log_debug |
2719 | ("thread %s has pending wait status %s (currently_stepping=%d).", | |
2720 | target_pid_to_str (tp->ptid).c_str (), | |
2721 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2722 | currently_stepping (tp)); | |
372316f1 PA |
2723 | } |
2724 | } | |
2725 | ||
70509625 PA |
2726 | /* If this signal should not be seen by program, give it zero. |
2727 | Used for debugging signals. */ | |
2728 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2729 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2730 | ||
46e3ed7f | 2731 | delete tp->thread_fsm; |
243a9253 PA |
2732 | tp->thread_fsm = NULL; |
2733 | ||
16c381f0 JK |
2734 | tp->control.trap_expected = 0; |
2735 | tp->control.step_range_start = 0; | |
2736 | tp->control.step_range_end = 0; | |
c1e36e3e | 2737 | tp->control.may_range_step = 0; |
16c381f0 JK |
2738 | tp->control.step_frame_id = null_frame_id; |
2739 | tp->control.step_stack_frame_id = null_frame_id; | |
2740 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2741 | tp->control.step_start_function = NULL; |
a7212384 | 2742 | tp->stop_requested = 0; |
4e1c45ea | 2743 | |
16c381f0 | 2744 | tp->control.stop_step = 0; |
32400beb | 2745 | |
16c381f0 | 2746 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2747 | |
856e7dd6 | 2748 | tp->control.stepping_command = 0; |
17b2616c | 2749 | |
a7212384 | 2750 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2751 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2752 | } |
32400beb | 2753 | |
a7212384 | 2754 | void |
70509625 | 2755 | clear_proceed_status (int step) |
a7212384 | 2756 | { |
f2665db5 MM |
2757 | /* With scheduler-locking replay, stop replaying other threads if we're |
2758 | not replaying the user-visible resume ptid. | |
2759 | ||
2760 | This is a convenience feature to not require the user to explicitly | |
2761 | stop replaying the other threads. We're assuming that the user's | |
2762 | intent is to resume tracing the recorded process. */ | |
2763 | if (!non_stop && scheduler_mode == schedlock_replay | |
2764 | && target_record_is_replaying (minus_one_ptid) | |
2765 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2766 | execution_direction)) | |
2767 | target_record_stop_replaying (); | |
2768 | ||
08036331 | 2769 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2770 | { |
08036331 | 2771 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2772 | process_stratum_target *resume_target |
2773 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2774 | |
2775 | /* In all-stop mode, delete the per-thread status of all threads | |
2776 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2777 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2778 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2779 | } |
2780 | ||
d7e15655 | 2781 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2782 | { |
2783 | struct inferior *inferior; | |
2784 | ||
2785 | if (non_stop) | |
2786 | { | |
6c95b8df PA |
2787 | /* If in non-stop mode, only delete the per-thread status of |
2788 | the current thread. */ | |
a7212384 UW |
2789 | clear_proceed_status_thread (inferior_thread ()); |
2790 | } | |
6c95b8df | 2791 | |
d6b48e9c | 2792 | inferior = current_inferior (); |
16c381f0 | 2793 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2794 | } |
2795 | ||
76727919 | 2796 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2797 | } |
2798 | ||
99619bea PA |
2799 | /* Returns true if TP is still stopped at a breakpoint that needs |
2800 | stepping-over in order to make progress. If the breakpoint is gone | |
2801 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2802 | |
2803 | static int | |
6c4cfb24 | 2804 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2805 | { |
2806 | if (tp->stepping_over_breakpoint) | |
2807 | { | |
00431a78 | 2808 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2809 | |
a01bda52 | 2810 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2811 | regcache_read_pc (regcache)) |
2812 | == ordinary_breakpoint_here) | |
99619bea PA |
2813 | return 1; |
2814 | ||
2815 | tp->stepping_over_breakpoint = 0; | |
2816 | } | |
2817 | ||
2818 | return 0; | |
2819 | } | |
2820 | ||
6c4cfb24 PA |
2821 | /* Check whether thread TP still needs to start a step-over in order |
2822 | to make progress when resumed. Returns an bitwise or of enum | |
2823 | step_over_what bits, indicating what needs to be stepped over. */ | |
2824 | ||
8d297bbf | 2825 | static step_over_what |
6c4cfb24 PA |
2826 | thread_still_needs_step_over (struct thread_info *tp) |
2827 | { | |
8d297bbf | 2828 | step_over_what what = 0; |
6c4cfb24 PA |
2829 | |
2830 | if (thread_still_needs_step_over_bp (tp)) | |
2831 | what |= STEP_OVER_BREAKPOINT; | |
2832 | ||
2833 | if (tp->stepping_over_watchpoint | |
2834 | && !target_have_steppable_watchpoint) | |
2835 | what |= STEP_OVER_WATCHPOINT; | |
2836 | ||
2837 | return what; | |
2838 | } | |
2839 | ||
483805cf PA |
2840 | /* Returns true if scheduler locking applies. STEP indicates whether |
2841 | we're about to do a step/next-like command to a thread. */ | |
2842 | ||
2843 | static int | |
856e7dd6 | 2844 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2845 | { |
2846 | return (scheduler_mode == schedlock_on | |
2847 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2848 | && tp->control.stepping_command) |
2849 | || (scheduler_mode == schedlock_replay | |
2850 | && target_record_will_replay (minus_one_ptid, | |
2851 | execution_direction))); | |
483805cf PA |
2852 | } |
2853 | ||
5b6d1e4f PA |
2854 | /* Calls target_commit_resume on all targets. */ |
2855 | ||
2856 | static void | |
2857 | commit_resume_all_targets () | |
2858 | { | |
2859 | scoped_restore_current_thread restore_thread; | |
2860 | ||
2861 | /* Map between process_target and a representative inferior. This | |
2862 | is to avoid committing a resume in the same target more than | |
2863 | once. Resumptions must be idempotent, so this is an | |
2864 | optimization. */ | |
2865 | std::unordered_map<process_stratum_target *, inferior *> conn_inf; | |
2866 | ||
2867 | for (inferior *inf : all_non_exited_inferiors ()) | |
2868 | if (inf->has_execution ()) | |
2869 | conn_inf[inf->process_target ()] = inf; | |
2870 | ||
2871 | for (const auto &ci : conn_inf) | |
2872 | { | |
2873 | inferior *inf = ci.second; | |
2874 | switch_to_inferior_no_thread (inf); | |
2875 | target_commit_resume (); | |
2876 | } | |
2877 | } | |
2878 | ||
2f4fcf00 PA |
2879 | /* Check that all the targets we're about to resume are in non-stop |
2880 | mode. Ideally, we'd only care whether all targets support | |
2881 | target-async, but we're not there yet. E.g., stop_all_threads | |
2882 | doesn't know how to handle all-stop targets. Also, the remote | |
2883 | protocol in all-stop mode is synchronous, irrespective of | |
2884 | target-async, which means that things like a breakpoint re-set | |
2885 | triggered by one target would try to read memory from all targets | |
2886 | and fail. */ | |
2887 | ||
2888 | static void | |
2889 | check_multi_target_resumption (process_stratum_target *resume_target) | |
2890 | { | |
2891 | if (!non_stop && resume_target == nullptr) | |
2892 | { | |
2893 | scoped_restore_current_thread restore_thread; | |
2894 | ||
2895 | /* This is used to track whether we're resuming more than one | |
2896 | target. */ | |
2897 | process_stratum_target *first_connection = nullptr; | |
2898 | ||
2899 | /* The first inferior we see with a target that does not work in | |
2900 | always-non-stop mode. */ | |
2901 | inferior *first_not_non_stop = nullptr; | |
2902 | ||
2903 | for (inferior *inf : all_non_exited_inferiors (resume_target)) | |
2904 | { | |
2905 | switch_to_inferior_no_thread (inf); | |
2906 | ||
2907 | if (!target_has_execution) | |
2908 | continue; | |
2909 | ||
2910 | process_stratum_target *proc_target | |
2911 | = current_inferior ()->process_target(); | |
2912 | ||
2913 | if (!target_is_non_stop_p ()) | |
2914 | first_not_non_stop = inf; | |
2915 | ||
2916 | if (first_connection == nullptr) | |
2917 | first_connection = proc_target; | |
2918 | else if (first_connection != proc_target | |
2919 | && first_not_non_stop != nullptr) | |
2920 | { | |
2921 | switch_to_inferior_no_thread (first_not_non_stop); | |
2922 | ||
2923 | proc_target = current_inferior ()->process_target(); | |
2924 | ||
2925 | error (_("Connection %d (%s) does not support " | |
2926 | "multi-target resumption."), | |
2927 | proc_target->connection_number, | |
2928 | make_target_connection_string (proc_target).c_str ()); | |
2929 | } | |
2930 | } | |
2931 | } | |
2932 | } | |
2933 | ||
c906108c SS |
2934 | /* Basic routine for continuing the program in various fashions. |
2935 | ||
2936 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
2937 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
2938 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
2939 | |
2940 | You should call clear_proceed_status before calling proceed. */ | |
2941 | ||
2942 | void | |
64ce06e4 | 2943 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2944 | { |
e58b0e63 PA |
2945 | struct regcache *regcache; |
2946 | struct gdbarch *gdbarch; | |
e58b0e63 | 2947 | CORE_ADDR pc; |
4d9d9d04 PA |
2948 | struct execution_control_state ecss; |
2949 | struct execution_control_state *ecs = &ecss; | |
4d9d9d04 | 2950 | int started; |
c906108c | 2951 | |
e58b0e63 PA |
2952 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2953 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2954 | resuming the current thread. */ | |
2955 | if (!follow_fork ()) | |
2956 | { | |
2957 | /* The target for some reason decided not to resume. */ | |
2958 | normal_stop (); | |
f148b27e PA |
2959 | if (target_can_async_p ()) |
2960 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2961 | return; |
2962 | } | |
2963 | ||
842951eb PA |
2964 | /* We'll update this if & when we switch to a new thread. */ |
2965 | previous_inferior_ptid = inferior_ptid; | |
2966 | ||
e58b0e63 | 2967 | regcache = get_current_regcache (); |
ac7936df | 2968 | gdbarch = regcache->arch (); |
8b86c959 YQ |
2969 | const address_space *aspace = regcache->aspace (); |
2970 | ||
fc75c28b TBA |
2971 | pc = regcache_read_pc_protected (regcache); |
2972 | ||
08036331 | 2973 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 2974 | |
99619bea | 2975 | /* Fill in with reasonable starting values. */ |
08036331 | 2976 | init_thread_stepping_state (cur_thr); |
99619bea | 2977 | |
08036331 | 2978 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 2979 | |
5b6d1e4f PA |
2980 | ptid_t resume_ptid |
2981 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
2982 | process_stratum_target *resume_target | |
2983 | = user_visible_resume_target (resume_ptid); | |
2984 | ||
2f4fcf00 PA |
2985 | check_multi_target_resumption (resume_target); |
2986 | ||
2acceee2 | 2987 | if (addr == (CORE_ADDR) -1) |
c906108c | 2988 | { |
08036331 | 2989 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 2990 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 2991 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2992 | /* There is a breakpoint at the address we will resume at, |
2993 | step one instruction before inserting breakpoints so that | |
2994 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2995 | breakpoint). |
2996 | ||
2997 | Note, we don't do this in reverse, because we won't | |
2998 | actually be executing the breakpoint insn anyway. | |
2999 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 3000 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
3001 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3002 | && gdbarch_single_step_through_delay (gdbarch, | |
3003 | get_current_frame ())) | |
3352ef37 AC |
3004 | /* We stepped onto an instruction that needs to be stepped |
3005 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 3006 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
3007 | } |
3008 | else | |
3009 | { | |
515630c5 | 3010 | regcache_write_pc (regcache, addr); |
c906108c SS |
3011 | } |
3012 | ||
70509625 | 3013 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 3014 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 3015 | |
4d9d9d04 PA |
3016 | /* If an exception is thrown from this point on, make sure to |
3017 | propagate GDB's knowledge of the executing state to the | |
3018 | frontend/user running state. */ | |
5b6d1e4f | 3019 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
3020 | |
3021 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3022 | threads (e.g., we might need to set threads stepping over | |
3023 | breakpoints first), from the user/frontend's point of view, all | |
3024 | threads in RESUME_PTID are now running. Unless we're calling an | |
3025 | inferior function, as in that case we pretend the inferior | |
3026 | doesn't run at all. */ | |
08036331 | 3027 | if (!cur_thr->control.in_infcall) |
719546c4 | 3028 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3029 | |
4100594e SM |
3030 | infrun_log_debug ("addr=%s, signal=%s", paddress (gdbarch, addr), |
3031 | gdb_signal_to_symbol_string (siggnal)); | |
527159b7 | 3032 | |
4d9d9d04 PA |
3033 | annotate_starting (); |
3034 | ||
3035 | /* Make sure that output from GDB appears before output from the | |
3036 | inferior. */ | |
3037 | gdb_flush (gdb_stdout); | |
3038 | ||
d930703d PA |
3039 | /* Since we've marked the inferior running, give it the terminal. A |
3040 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3041 | still detect attempts to unblock a stuck connection with repeated | |
3042 | Ctrl-C from within target_pass_ctrlc). */ | |
3043 | target_terminal::inferior (); | |
3044 | ||
4d9d9d04 PA |
3045 | /* In a multi-threaded task we may select another thread and |
3046 | then continue or step. | |
3047 | ||
3048 | But if a thread that we're resuming had stopped at a breakpoint, | |
3049 | it will immediately cause another breakpoint stop without any | |
3050 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3051 | we must step over it first. | |
3052 | ||
3053 | Look for threads other than the current (TP) that reported a | |
3054 | breakpoint hit and haven't been resumed yet since. */ | |
3055 | ||
3056 | /* If scheduler locking applies, we can avoid iterating over all | |
3057 | threads. */ | |
08036331 | 3058 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3059 | { |
5b6d1e4f PA |
3060 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3061 | resume_ptid)) | |
08036331 | 3062 | { |
f3f8ece4 PA |
3063 | switch_to_thread_no_regs (tp); |
3064 | ||
4d9d9d04 PA |
3065 | /* Ignore the current thread here. It's handled |
3066 | afterwards. */ | |
08036331 | 3067 | if (tp == cur_thr) |
4d9d9d04 | 3068 | continue; |
c906108c | 3069 | |
4d9d9d04 PA |
3070 | if (!thread_still_needs_step_over (tp)) |
3071 | continue; | |
3072 | ||
3073 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3074 | |
4100594e SM |
3075 | infrun_log_debug ("need to step-over [%s] first", |
3076 | target_pid_to_str (tp->ptid).c_str ()); | |
99619bea | 3077 | |
4d9d9d04 | 3078 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3079 | } |
f3f8ece4 PA |
3080 | |
3081 | switch_to_thread (cur_thr); | |
30852783 UW |
3082 | } |
3083 | ||
4d9d9d04 PA |
3084 | /* Enqueue the current thread last, so that we move all other |
3085 | threads over their breakpoints first. */ | |
08036331 PA |
3086 | if (cur_thr->stepping_over_breakpoint) |
3087 | thread_step_over_chain_enqueue (cur_thr); | |
30852783 | 3088 | |
4d9d9d04 PA |
3089 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3090 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3091 | advanced. Must do this before resuming any thread, as in | |
3092 | all-stop/remote, once we resume we can't send any other packet | |
3093 | until the target stops again. */ | |
fc75c28b | 3094 | cur_thr->prev_pc = regcache_read_pc_protected (regcache); |
99619bea | 3095 | |
a9bc57b9 TT |
3096 | { |
3097 | scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume (); | |
85ad3aaf | 3098 | |
a9bc57b9 | 3099 | started = start_step_over (); |
c906108c | 3100 | |
a9bc57b9 TT |
3101 | if (step_over_info_valid_p ()) |
3102 | { | |
3103 | /* Either this thread started a new in-line step over, or some | |
3104 | other thread was already doing one. In either case, don't | |
3105 | resume anything else until the step-over is finished. */ | |
3106 | } | |
3107 | else if (started && !target_is_non_stop_p ()) | |
3108 | { | |
3109 | /* A new displaced stepping sequence was started. In all-stop, | |
3110 | we can't talk to the target anymore until it next stops. */ | |
3111 | } | |
3112 | else if (!non_stop && target_is_non_stop_p ()) | |
3113 | { | |
3114 | /* In all-stop, but the target is always in non-stop mode. | |
3115 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3116 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3117 | resume_ptid)) | |
3118 | { | |
3119 | switch_to_thread_no_regs (tp); | |
3120 | ||
f9fac3c8 SM |
3121 | if (!tp->inf->has_execution ()) |
3122 | { | |
4100594e SM |
3123 | infrun_log_debug ("[%s] target has no execution", |
3124 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3125 | continue; |
3126 | } | |
f3f8ece4 | 3127 | |
f9fac3c8 SM |
3128 | if (tp->resumed) |
3129 | { | |
4100594e SM |
3130 | infrun_log_debug ("[%s] resumed", |
3131 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3132 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
3133 | continue; | |
3134 | } | |
fbea99ea | 3135 | |
f9fac3c8 SM |
3136 | if (thread_is_in_step_over_chain (tp)) |
3137 | { | |
4100594e SM |
3138 | infrun_log_debug ("[%s] needs step-over", |
3139 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3140 | continue; |
3141 | } | |
fbea99ea | 3142 | |
4100594e SM |
3143 | infrun_log_debug ("resuming %s", |
3144 | target_pid_to_str (tp->ptid).c_str ()); | |
fbea99ea | 3145 | |
f9fac3c8 SM |
3146 | reset_ecs (ecs, tp); |
3147 | switch_to_thread (tp); | |
3148 | keep_going_pass_signal (ecs); | |
3149 | if (!ecs->wait_some_more) | |
3150 | error (_("Command aborted.")); | |
3151 | } | |
a9bc57b9 | 3152 | } |
08036331 | 3153 | else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3154 | { |
3155 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3156 | reset_ecs (ecs, cur_thr); |
3157 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3158 | keep_going_pass_signal (ecs); |
3159 | if (!ecs->wait_some_more) | |
3160 | error (_("Command aborted.")); | |
3161 | } | |
3162 | } | |
c906108c | 3163 | |
5b6d1e4f | 3164 | commit_resume_all_targets (); |
85ad3aaf | 3165 | |
731f534f | 3166 | finish_state.release (); |
c906108c | 3167 | |
873657b9 PA |
3168 | /* If we've switched threads above, switch back to the previously |
3169 | current thread. We don't want the user to see a different | |
3170 | selected thread. */ | |
3171 | switch_to_thread (cur_thr); | |
3172 | ||
0b333c5e PA |
3173 | /* Tell the event loop to wait for it to stop. If the target |
3174 | supports asynchronous execution, it'll do this from within | |
3175 | target_resume. */ | |
362646f5 | 3176 | if (!target_can_async_p ()) |
0b333c5e | 3177 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3178 | } |
c906108c SS |
3179 | \f |
3180 | ||
3181 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3182 | |
c906108c | 3183 | void |
8621d6a9 | 3184 | start_remote (int from_tty) |
c906108c | 3185 | { |
5b6d1e4f PA |
3186 | inferior *inf = current_inferior (); |
3187 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3188 | |
1777feb0 | 3189 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3190 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3191 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3192 | nothing is returned (instead of just blocking). Because of this, |
3193 | targets expecting an immediate response need to, internally, set | |
3194 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3195 | timeout. */ |
6426a772 JM |
3196 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3197 | differentiate to its caller what the state of the target is after | |
3198 | the initial open has been performed. Here we're assuming that | |
3199 | the target has stopped. It should be possible to eventually have | |
3200 | target_open() return to the caller an indication that the target | |
3201 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3202 | for an async run. */ |
5b6d1e4f | 3203 | wait_for_inferior (inf); |
8621d6a9 DJ |
3204 | |
3205 | /* Now that the inferior has stopped, do any bookkeeping like | |
3206 | loading shared libraries. We want to do this before normal_stop, | |
3207 | so that the displayed frame is up to date. */ | |
8b88a78e | 3208 | post_create_inferior (current_top_target (), from_tty); |
8621d6a9 | 3209 | |
6426a772 | 3210 | normal_stop (); |
c906108c SS |
3211 | } |
3212 | ||
3213 | /* Initialize static vars when a new inferior begins. */ | |
3214 | ||
3215 | void | |
96baa820 | 3216 | init_wait_for_inferior (void) |
c906108c SS |
3217 | { |
3218 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3219 | |
c906108c SS |
3220 | breakpoint_init_inferior (inf_starting); |
3221 | ||
70509625 | 3222 | clear_proceed_status (0); |
9f976b41 | 3223 | |
ab1ddbcf | 3224 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3225 | |
842951eb | 3226 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3227 | } |
237fc4c9 | 3228 | |
c906108c | 3229 | \f |
488f131b | 3230 | |
ec9499be | 3231 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3232 | |
568d6575 UW |
3233 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3234 | struct execution_control_state *ecs); | |
3235 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3236 | struct execution_control_state *ecs); | |
4f5d7f63 | 3237 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3238 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3239 | struct frame_info *); |
611c83ae | 3240 | |
bdc36728 | 3241 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3242 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3243 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3244 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3245 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3246 | |
252fbfc8 PA |
3247 | /* This function is attached as a "thread_stop_requested" observer. |
3248 | Cleanup local state that assumed the PTID was to be resumed, and | |
3249 | report the stop to the frontend. */ | |
3250 | ||
2c0b251b | 3251 | static void |
252fbfc8 PA |
3252 | infrun_thread_stop_requested (ptid_t ptid) |
3253 | { | |
5b6d1e4f PA |
3254 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3255 | ||
c65d6b55 PA |
3256 | /* PTID was requested to stop. If the thread was already stopped, |
3257 | but the user/frontend doesn't know about that yet (e.g., the | |
3258 | thread had been temporarily paused for some step-over), set up | |
3259 | for reporting the stop now. */ | |
5b6d1e4f | 3260 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3261 | { |
3262 | if (tp->state != THREAD_RUNNING) | |
3263 | continue; | |
3264 | if (tp->executing) | |
3265 | continue; | |
c65d6b55 | 3266 | |
08036331 PA |
3267 | /* Remove matching threads from the step-over queue, so |
3268 | start_step_over doesn't try to resume them | |
3269 | automatically. */ | |
3270 | if (thread_is_in_step_over_chain (tp)) | |
3271 | thread_step_over_chain_remove (tp); | |
c65d6b55 | 3272 | |
08036331 PA |
3273 | /* If the thread is stopped, but the user/frontend doesn't |
3274 | know about that yet, queue a pending event, as if the | |
3275 | thread had just stopped now. Unless the thread already had | |
3276 | a pending event. */ | |
3277 | if (!tp->suspend.waitstatus_pending_p) | |
3278 | { | |
3279 | tp->suspend.waitstatus_pending_p = 1; | |
3280 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3281 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3282 | } | |
c65d6b55 | 3283 | |
08036331 PA |
3284 | /* Clear the inline-frame state, since we're re-processing the |
3285 | stop. */ | |
5b6d1e4f | 3286 | clear_inline_frame_state (tp); |
c65d6b55 | 3287 | |
08036331 PA |
3288 | /* If this thread was paused because some other thread was |
3289 | doing an inline-step over, let that finish first. Once | |
3290 | that happens, we'll restart all threads and consume pending | |
3291 | stop events then. */ | |
3292 | if (step_over_info_valid_p ()) | |
3293 | continue; | |
3294 | ||
3295 | /* Otherwise we can process the (new) pending event now. Set | |
3296 | it so this pending event is considered by | |
3297 | do_target_wait. */ | |
719546c4 | 3298 | tp->resumed = true; |
08036331 | 3299 | } |
252fbfc8 PA |
3300 | } |
3301 | ||
a07daef3 PA |
3302 | static void |
3303 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3304 | { | |
5b6d1e4f PA |
3305 | if (target_last_proc_target == tp->inf->process_target () |
3306 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3307 | nullify_last_target_wait_ptid (); |
3308 | } | |
3309 | ||
0cbcdb96 PA |
3310 | /* Delete the step resume, single-step and longjmp/exception resume |
3311 | breakpoints of TP. */ | |
4e1c45ea | 3312 | |
0cbcdb96 PA |
3313 | static void |
3314 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3315 | { |
0cbcdb96 PA |
3316 | delete_step_resume_breakpoint (tp); |
3317 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3318 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3319 | } |
3320 | ||
0cbcdb96 PA |
3321 | /* If the target still has execution, call FUNC for each thread that |
3322 | just stopped. In all-stop, that's all the non-exited threads; in | |
3323 | non-stop, that's the current thread, only. */ | |
3324 | ||
3325 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3326 | (struct thread_info *tp); | |
4e1c45ea PA |
3327 | |
3328 | static void | |
0cbcdb96 | 3329 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3330 | { |
d7e15655 | 3331 | if (!target_has_execution || inferior_ptid == null_ptid) |
4e1c45ea PA |
3332 | return; |
3333 | ||
fbea99ea | 3334 | if (target_is_non_stop_p ()) |
4e1c45ea | 3335 | { |
0cbcdb96 PA |
3336 | /* If in non-stop mode, only the current thread stopped. */ |
3337 | func (inferior_thread ()); | |
4e1c45ea PA |
3338 | } |
3339 | else | |
0cbcdb96 | 3340 | { |
0cbcdb96 | 3341 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3342 | for (thread_info *tp : all_non_exited_threads ()) |
3343 | func (tp); | |
0cbcdb96 PA |
3344 | } |
3345 | } | |
3346 | ||
3347 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3348 | the threads that just stopped. */ | |
3349 | ||
3350 | static void | |
3351 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3352 | { | |
3353 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3354 | } |
3355 | ||
3356 | /* Delete the single-step breakpoints of the threads that just | |
3357 | stopped. */ | |
7c16b83e | 3358 | |
34b7e8a6 PA |
3359 | static void |
3360 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3361 | { | |
3362 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3363 | } |
3364 | ||
221e1a37 | 3365 | /* See infrun.h. */ |
223698f8 | 3366 | |
221e1a37 | 3367 | void |
223698f8 DE |
3368 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3369 | const struct target_waitstatus *ws) | |
3370 | { | |
23fdd69e | 3371 | std::string status_string = target_waitstatus_to_string (ws); |
d7e74731 | 3372 | string_file stb; |
223698f8 DE |
3373 | |
3374 | /* The text is split over several lines because it was getting too long. | |
3375 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3376 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3377 | is set. */ | |
3378 | ||
d7e74731 | 3379 | stb.printf ("infrun: target_wait (%d.%ld.%ld", |
e99b03dc | 3380 | waiton_ptid.pid (), |
e38504b3 | 3381 | waiton_ptid.lwp (), |
cc6bcb54 | 3382 | waiton_ptid.tid ()); |
e99b03dc | 3383 | if (waiton_ptid.pid () != -1) |
a068643d | 3384 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid).c_str ()); |
d7e74731 PA |
3385 | stb.printf (", status) =\n"); |
3386 | stb.printf ("infrun: %d.%ld.%ld [%s],\n", | |
e99b03dc | 3387 | result_ptid.pid (), |
e38504b3 | 3388 | result_ptid.lwp (), |
cc6bcb54 | 3389 | result_ptid.tid (), |
a068643d | 3390 | target_pid_to_str (result_ptid).c_str ()); |
23fdd69e | 3391 | stb.printf ("infrun: %s\n", status_string.c_str ()); |
223698f8 DE |
3392 | |
3393 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3394 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3395 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3396 | } |
3397 | ||
372316f1 PA |
3398 | /* Select a thread at random, out of those which are resumed and have |
3399 | had events. */ | |
3400 | ||
3401 | static struct thread_info * | |
5b6d1e4f | 3402 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3403 | { |
372316f1 | 3404 | int num_events = 0; |
08036331 | 3405 | |
5b6d1e4f | 3406 | auto has_event = [&] (thread_info *tp) |
08036331 | 3407 | { |
5b6d1e4f PA |
3408 | return (tp->ptid.matches (waiton_ptid) |
3409 | && tp->resumed | |
08036331 PA |
3410 | && tp->suspend.waitstatus_pending_p); |
3411 | }; | |
372316f1 PA |
3412 | |
3413 | /* First see how many events we have. Count only resumed threads | |
3414 | that have an event pending. */ | |
5b6d1e4f | 3415 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3416 | if (has_event (tp)) |
372316f1 PA |
3417 | num_events++; |
3418 | ||
3419 | if (num_events == 0) | |
3420 | return NULL; | |
3421 | ||
3422 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3423 | int random_selector = (int) ((num_events * (double) rand ()) |
3424 | / (RAND_MAX + 1.0)); | |
372316f1 | 3425 | |
4100594e SM |
3426 | if (num_events > 1) |
3427 | infrun_log_debug ("Found %d events, selecting #%d", | |
3428 | num_events, random_selector); | |
372316f1 PA |
3429 | |
3430 | /* Select the Nth thread that has had an event. */ | |
5b6d1e4f | 3431 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3432 | if (has_event (tp)) |
372316f1 | 3433 | if (random_selector-- == 0) |
08036331 | 3434 | return tp; |
372316f1 | 3435 | |
08036331 | 3436 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3437 | } |
3438 | ||
3439 | /* Wrapper for target_wait that first checks whether threads have | |
3440 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3441 | more events. INF is the inferior we're using to call target_wait |
3442 | on. */ | |
372316f1 PA |
3443 | |
3444 | static ptid_t | |
5b6d1e4f PA |
3445 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
3446 | target_waitstatus *status, int options) | |
372316f1 PA |
3447 | { |
3448 | ptid_t event_ptid; | |
3449 | struct thread_info *tp; | |
3450 | ||
24ed6739 AB |
3451 | /* We know that we are looking for an event in the target of inferior |
3452 | INF, but we don't know which thread the event might come from. As | |
3453 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3454 | the wait code relies on it - doing so is always a mistake. */ | |
3455 | switch_to_inferior_no_thread (inf); | |
3456 | ||
372316f1 PA |
3457 | /* First check if there is a resumed thread with a wait status |
3458 | pending. */ | |
d7e15655 | 3459 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3460 | { |
5b6d1e4f | 3461 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3462 | } |
3463 | else | |
3464 | { | |
4100594e SM |
3465 | infrun_log_debug ("Waiting for specific thread %s.", |
3466 | target_pid_to_str (ptid).c_str ()); | |
372316f1 PA |
3467 | |
3468 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3469 | tp = find_thread_ptid (inf, ptid); |
372316f1 PA |
3470 | gdb_assert (tp != NULL); |
3471 | if (!tp->suspend.waitstatus_pending_p) | |
3472 | tp = NULL; | |
3473 | } | |
3474 | ||
3475 | if (tp != NULL | |
3476 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3477 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3478 | { | |
00431a78 | 3479 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3480 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3481 | CORE_ADDR pc; |
3482 | int discard = 0; | |
3483 | ||
3484 | pc = regcache_read_pc (regcache); | |
3485 | ||
3486 | if (pc != tp->suspend.stop_pc) | |
3487 | { | |
4100594e SM |
3488 | infrun_log_debug ("PC of %s changed. was=%s, now=%s", |
3489 | target_pid_to_str (tp->ptid).c_str (), | |
3490 | paddress (gdbarch, tp->suspend.stop_pc), | |
3491 | paddress (gdbarch, pc)); | |
372316f1 PA |
3492 | discard = 1; |
3493 | } | |
a01bda52 | 3494 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 | 3495 | { |
4100594e SM |
3496 | infrun_log_debug ("previous breakpoint of %s, at %s gone", |
3497 | target_pid_to_str (tp->ptid).c_str (), | |
3498 | paddress (gdbarch, pc)); | |
372316f1 PA |
3499 | |
3500 | discard = 1; | |
3501 | } | |
3502 | ||
3503 | if (discard) | |
3504 | { | |
4100594e SM |
3505 | infrun_log_debug ("pending event of %s cancelled.", |
3506 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3507 | |
3508 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3509 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3510 | } | |
3511 | } | |
3512 | ||
3513 | if (tp != NULL) | |
3514 | { | |
4100594e SM |
3515 | infrun_log_debug ("Using pending wait status %s for %s.", |
3516 | target_waitstatus_to_string | |
3517 | (&tp->suspend.waitstatus).c_str (), | |
3518 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3519 | |
3520 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3521 | if it was a software breakpoint (and the target doesn't | |
3522 | always adjust the PC itself). */ | |
3523 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3524 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3525 | { | |
3526 | struct regcache *regcache; | |
3527 | struct gdbarch *gdbarch; | |
3528 | int decr_pc; | |
3529 | ||
00431a78 | 3530 | regcache = get_thread_regcache (tp); |
ac7936df | 3531 | gdbarch = regcache->arch (); |
372316f1 PA |
3532 | |
3533 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3534 | if (decr_pc != 0) | |
3535 | { | |
3536 | CORE_ADDR pc; | |
3537 | ||
3538 | pc = regcache_read_pc (regcache); | |
3539 | regcache_write_pc (regcache, pc + decr_pc); | |
3540 | } | |
3541 | } | |
3542 | ||
3543 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3544 | *status = tp->suspend.waitstatus; | |
3545 | tp->suspend.waitstatus_pending_p = 0; | |
3546 | ||
3547 | /* Wake up the event loop again, until all pending events are | |
3548 | processed. */ | |
3549 | if (target_is_async_p ()) | |
3550 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3551 | return tp->ptid; | |
3552 | } | |
3553 | ||
3554 | /* But if we don't find one, we'll have to wait. */ | |
3555 | ||
3556 | if (deprecated_target_wait_hook) | |
3557 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3558 | else | |
3559 | event_ptid = target_wait (ptid, status, options); | |
3560 | ||
3561 | return event_ptid; | |
3562 | } | |
3563 | ||
5b6d1e4f PA |
3564 | /* Returns true if INF has any resumed thread with a status |
3565 | pending. */ | |
3566 | ||
3567 | static bool | |
3568 | threads_are_resumed_pending_p (inferior *inf) | |
3569 | { | |
3570 | for (thread_info *tp : inf->non_exited_threads ()) | |
3571 | if (tp->resumed | |
3572 | && tp->suspend.waitstatus_pending_p) | |
3573 | return true; | |
3574 | ||
3575 | return false; | |
3576 | } | |
3577 | ||
3578 | /* Wrapper for target_wait that first checks whether threads have | |
3579 | pending statuses to report before actually asking the target for | |
3580 | more events. Polls for events from all inferiors/targets. */ | |
3581 | ||
3582 | static bool | |
3583 | do_target_wait (ptid_t wait_ptid, execution_control_state *ecs, int options) | |
3584 | { | |
3585 | int num_inferiors = 0; | |
3586 | int random_selector; | |
3587 | ||
3588 | /* For fairness, we pick the first inferior/target to poll at | |
3589 | random, and then continue polling the rest of the inferior list | |
3590 | starting from that one in a circular fashion until the whole list | |
3591 | is polled once. */ | |
3592 | ||
3593 | auto inferior_matches = [&wait_ptid] (inferior *inf) | |
3594 | { | |
3595 | return (inf->process_target () != NULL | |
3596 | && (threads_are_executing (inf->process_target ()) | |
3597 | || threads_are_resumed_pending_p (inf)) | |
3598 | && ptid_t (inf->pid).matches (wait_ptid)); | |
3599 | }; | |
3600 | ||
3601 | /* First see how many resumed inferiors we have. */ | |
3602 | for (inferior *inf : all_inferiors ()) | |
3603 | if (inferior_matches (inf)) | |
3604 | num_inferiors++; | |
3605 | ||
3606 | if (num_inferiors == 0) | |
3607 | { | |
3608 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3609 | return false; | |
3610 | } | |
3611 | ||
3612 | /* Now randomly pick an inferior out of those that were resumed. */ | |
3613 | random_selector = (int) | |
3614 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3615 | ||
4100594e SM |
3616 | if (num_inferiors > 1) |
3617 | infrun_log_debug ("Found %d inferiors, starting at #%d", | |
3618 | num_inferiors, random_selector); | |
5b6d1e4f PA |
3619 | |
3620 | /* Select the Nth inferior that was resumed. */ | |
3621 | ||
3622 | inferior *selected = nullptr; | |
3623 | ||
3624 | for (inferior *inf : all_inferiors ()) | |
3625 | if (inferior_matches (inf)) | |
3626 | if (random_selector-- == 0) | |
3627 | { | |
3628 | selected = inf; | |
3629 | break; | |
3630 | } | |
3631 | ||
3632 | /* Now poll for events out of each of the resumed inferior's | |
3633 | targets, starting from the selected one. */ | |
3634 | ||
3635 | auto do_wait = [&] (inferior *inf) | |
3636 | { | |
5b6d1e4f PA |
3637 | ecs->ptid = do_target_wait_1 (inf, wait_ptid, &ecs->ws, options); |
3638 | ecs->target = inf->process_target (); | |
3639 | return (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3640 | }; | |
3641 | ||
3642 | /* Needed in all-stop+target-non-stop mode, because we end up here | |
3643 | spuriously after the target is all stopped and we've already | |
3644 | reported the stop to the user, polling for events. */ | |
3645 | scoped_restore_current_thread restore_thread; | |
3646 | ||
3647 | int inf_num = selected->num; | |
3648 | for (inferior *inf = selected; inf != NULL; inf = inf->next) | |
3649 | if (inferior_matches (inf)) | |
3650 | if (do_wait (inf)) | |
3651 | return true; | |
3652 | ||
3653 | for (inferior *inf = inferior_list; | |
3654 | inf != NULL && inf->num < inf_num; | |
3655 | inf = inf->next) | |
3656 | if (inferior_matches (inf)) | |
3657 | if (do_wait (inf)) | |
3658 | return true; | |
3659 | ||
3660 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3661 | return false; | |
3662 | } | |
3663 | ||
24291992 PA |
3664 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3665 | detaching while a thread is displaced stepping is a recipe for | |
3666 | crashing it, as nothing would readjust the PC out of the scratch | |
3667 | pad. */ | |
3668 | ||
3669 | void | |
3670 | prepare_for_detach (void) | |
3671 | { | |
3672 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3673 | ptid_t pid_ptid = ptid_t (inf->pid); |
24291992 | 3674 | |
00431a78 | 3675 | displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf); |
24291992 PA |
3676 | |
3677 | /* Is any thread of this process displaced stepping? If not, | |
3678 | there's nothing else to do. */ | |
d20172fc | 3679 | if (displaced->step_thread == nullptr) |
24291992 PA |
3680 | return; |
3681 | ||
4100594e | 3682 | infrun_log_debug ("displaced-stepping in-process while detaching"); |
24291992 | 3683 | |
9bcb1f16 | 3684 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3685 | |
00431a78 | 3686 | while (displaced->step_thread != nullptr) |
24291992 | 3687 | { |
24291992 PA |
3688 | struct execution_control_state ecss; |
3689 | struct execution_control_state *ecs; | |
3690 | ||
3691 | ecs = &ecss; | |
3692 | memset (ecs, 0, sizeof (*ecs)); | |
3693 | ||
3694 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3695 | /* Flush target cache before starting to handle each event. |
3696 | Target was running and cache could be stale. This is just a | |
3697 | heuristic. Running threads may modify target memory, but we | |
3698 | don't get any event. */ | |
3699 | target_dcache_invalidate (); | |
24291992 | 3700 | |
5b6d1e4f | 3701 | do_target_wait (pid_ptid, ecs, 0); |
24291992 PA |
3702 | |
3703 | if (debug_infrun) | |
3704 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3705 | ||
3706 | /* If an error happens while handling the event, propagate GDB's | |
3707 | knowledge of the executing state to the frontend/user running | |
3708 | state. */ | |
5b6d1e4f PA |
3709 | scoped_finish_thread_state finish_state (inf->process_target (), |
3710 | minus_one_ptid); | |
24291992 PA |
3711 | |
3712 | /* Now figure out what to do with the result of the result. */ | |
3713 | handle_inferior_event (ecs); | |
3714 | ||
3715 | /* No error, don't finish the state yet. */ | |
731f534f | 3716 | finish_state.release (); |
24291992 PA |
3717 | |
3718 | /* Breakpoints and watchpoints are not installed on the target | |
3719 | at this point, and signals are passed directly to the | |
3720 | inferior, so this must mean the process is gone. */ | |
3721 | if (!ecs->wait_some_more) | |
3722 | { | |
9bcb1f16 | 3723 | restore_detaching.release (); |
24291992 PA |
3724 | error (_("Program exited while detaching")); |
3725 | } | |
3726 | } | |
3727 | ||
9bcb1f16 | 3728 | restore_detaching.release (); |
24291992 PA |
3729 | } |
3730 | ||
cd0fc7c3 | 3731 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3732 | |
cd0fc7c3 SS |
3733 | If inferior gets a signal, we may decide to start it up again |
3734 | instead of returning. That is why there is a loop in this function. | |
3735 | When this function actually returns it means the inferior | |
3736 | should be left stopped and GDB should read more commands. */ | |
3737 | ||
5b6d1e4f PA |
3738 | static void |
3739 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3740 | { |
4100594e | 3741 | infrun_log_debug ("wait_for_inferior ()"); |
527159b7 | 3742 | |
4c41382a | 3743 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3744 | |
e6f5c25b PA |
3745 | /* If an error happens while handling the event, propagate GDB's |
3746 | knowledge of the executing state to the frontend/user running | |
3747 | state. */ | |
5b6d1e4f PA |
3748 | scoped_finish_thread_state finish_state |
3749 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 3750 | |
c906108c SS |
3751 | while (1) |
3752 | { | |
ae25568b PA |
3753 | struct execution_control_state ecss; |
3754 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 3755 | |
ae25568b PA |
3756 | memset (ecs, 0, sizeof (*ecs)); |
3757 | ||
ec9499be | 3758 | overlay_cache_invalid = 1; |
ec9499be | 3759 | |
f15cb84a YQ |
3760 | /* Flush target cache before starting to handle each event. |
3761 | Target was running and cache could be stale. This is just a | |
3762 | heuristic. Running threads may modify target memory, but we | |
3763 | don't get any event. */ | |
3764 | target_dcache_invalidate (); | |
3765 | ||
5b6d1e4f PA |
3766 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
3767 | ecs->target = inf->process_target (); | |
c906108c | 3768 | |
f00150c9 | 3769 | if (debug_infrun) |
5b6d1e4f | 3770 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3771 | |
cd0fc7c3 SS |
3772 | /* Now figure out what to do with the result of the result. */ |
3773 | handle_inferior_event (ecs); | |
c906108c | 3774 | |
cd0fc7c3 SS |
3775 | if (!ecs->wait_some_more) |
3776 | break; | |
3777 | } | |
4e1c45ea | 3778 | |
e6f5c25b | 3779 | /* No error, don't finish the state yet. */ |
731f534f | 3780 | finish_state.release (); |
cd0fc7c3 | 3781 | } |
c906108c | 3782 | |
d3d4baed PA |
3783 | /* Cleanup that reinstalls the readline callback handler, if the |
3784 | target is running in the background. If while handling the target | |
3785 | event something triggered a secondary prompt, like e.g., a | |
3786 | pagination prompt, we'll have removed the callback handler (see | |
3787 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3788 | event loop, ready to process further input. Note this has no | |
3789 | effect if the handler hasn't actually been removed, because calling | |
3790 | rl_callback_handler_install resets the line buffer, thus losing | |
3791 | input. */ | |
3792 | ||
3793 | static void | |
d238133d | 3794 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 3795 | { |
3b12939d PA |
3796 | struct ui *ui = current_ui; |
3797 | ||
3798 | if (!ui->async) | |
6c400b59 PA |
3799 | { |
3800 | /* We're not going back to the top level event loop yet. Don't | |
3801 | install the readline callback, as it'd prep the terminal, | |
3802 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3803 | it the next time the prompt is displayed, when we're ready | |
3804 | for input. */ | |
3805 | return; | |
3806 | } | |
3807 | ||
3b12939d | 3808 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3809 | gdb_rl_callback_handler_reinstall (); |
3810 | } | |
3811 | ||
243a9253 PA |
3812 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3813 | that's just the event thread. In all-stop, that's all threads. */ | |
3814 | ||
3815 | static void | |
3816 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3817 | { | |
08036331 PA |
3818 | if (ecs->event_thread != NULL |
3819 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 3820 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
3821 | |
3822 | if (!non_stop) | |
3823 | { | |
08036331 | 3824 | for (thread_info *thr : all_non_exited_threads ()) |
243a9253 PA |
3825 | { |
3826 | if (thr->thread_fsm == NULL) | |
3827 | continue; | |
3828 | if (thr == ecs->event_thread) | |
3829 | continue; | |
3830 | ||
00431a78 | 3831 | switch_to_thread (thr); |
46e3ed7f | 3832 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
3833 | } |
3834 | ||
3835 | if (ecs->event_thread != NULL) | |
00431a78 | 3836 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3837 | } |
3838 | } | |
3839 | ||
3b12939d PA |
3840 | /* Helper for all_uis_check_sync_execution_done that works on the |
3841 | current UI. */ | |
3842 | ||
3843 | static void | |
3844 | check_curr_ui_sync_execution_done (void) | |
3845 | { | |
3846 | struct ui *ui = current_ui; | |
3847 | ||
3848 | if (ui->prompt_state == PROMPT_NEEDED | |
3849 | && ui->async | |
3850 | && !gdb_in_secondary_prompt_p (ui)) | |
3851 | { | |
223ffa71 | 3852 | target_terminal::ours (); |
76727919 | 3853 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3854 | ui_register_input_event_handler (ui); |
3b12939d PA |
3855 | } |
3856 | } | |
3857 | ||
3858 | /* See infrun.h. */ | |
3859 | ||
3860 | void | |
3861 | all_uis_check_sync_execution_done (void) | |
3862 | { | |
0e454242 | 3863 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3864 | { |
3865 | check_curr_ui_sync_execution_done (); | |
3866 | } | |
3867 | } | |
3868 | ||
a8836c93 PA |
3869 | /* See infrun.h. */ |
3870 | ||
3871 | void | |
3872 | all_uis_on_sync_execution_starting (void) | |
3873 | { | |
0e454242 | 3874 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3875 | { |
3876 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3877 | async_disable_stdin (); | |
3878 | } | |
3879 | } | |
3880 | ||
1777feb0 | 3881 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3882 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3883 | descriptor corresponding to the target. It can be called more than |
3884 | once to complete a single execution command. In such cases we need | |
3885 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3886 | that this function is called for a single execution command, then |
3887 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3888 | necessary cleanups. */ |
43ff13b4 JM |
3889 | |
3890 | void | |
fba45db2 | 3891 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3892 | { |
0d1e5fa7 | 3893 | struct execution_control_state ecss; |
a474d7c2 | 3894 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 3895 | int cmd_done = 0; |
43ff13b4 | 3896 | |
0d1e5fa7 PA |
3897 | memset (ecs, 0, sizeof (*ecs)); |
3898 | ||
c61db772 PA |
3899 | /* Events are always processed with the main UI as current UI. This |
3900 | way, warnings, debug output, etc. are always consistently sent to | |
3901 | the main console. */ | |
4b6749b9 | 3902 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3903 | |
d3d4baed | 3904 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
3905 | { |
3906 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
3907 | ||
3908 | /* We're handling a live event, so make sure we're doing live | |
3909 | debugging. If we're looking at traceframes while the target is | |
3910 | running, we're going to need to get back to that mode after | |
3911 | handling the event. */ | |
3912 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
3913 | if (non_stop) | |
3914 | { | |
3915 | maybe_restore_traceframe.emplace (); | |
3916 | set_current_traceframe (-1); | |
3917 | } | |
43ff13b4 | 3918 | |
873657b9 PA |
3919 | /* The user/frontend should not notice a thread switch due to |
3920 | internal events. Make sure we revert to the user selected | |
3921 | thread and frame after handling the event and running any | |
3922 | breakpoint commands. */ | |
3923 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
3924 | |
3925 | overlay_cache_invalid = 1; | |
3926 | /* Flush target cache before starting to handle each event. Target | |
3927 | was running and cache could be stale. This is just a heuristic. | |
3928 | Running threads may modify target memory, but we don't get any | |
3929 | event. */ | |
3930 | target_dcache_invalidate (); | |
3931 | ||
3932 | scoped_restore save_exec_dir | |
3933 | = make_scoped_restore (&execution_direction, | |
3934 | target_execution_direction ()); | |
3935 | ||
5b6d1e4f PA |
3936 | if (!do_target_wait (minus_one_ptid, ecs, TARGET_WNOHANG)) |
3937 | return; | |
3938 | ||
3939 | gdb_assert (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3940 | ||
3941 | /* Switch to the target that generated the event, so we can do | |
3942 | target calls. Any inferior bound to the target will do, so we | |
3943 | just switch to the first we find. */ | |
3944 | for (inferior *inf : all_inferiors (ecs->target)) | |
3945 | { | |
3946 | switch_to_inferior_no_thread (inf); | |
3947 | break; | |
3948 | } | |
d238133d TT |
3949 | |
3950 | if (debug_infrun) | |
5b6d1e4f | 3951 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
d238133d TT |
3952 | |
3953 | /* If an error happens while handling the event, propagate GDB's | |
3954 | knowledge of the executing state to the frontend/user running | |
3955 | state. */ | |
3956 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 3957 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 3958 | |
979a0d13 | 3959 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
3960 | still for the thread which has thrown the exception. */ |
3961 | auto defer_bpstat_clear | |
3962 | = make_scope_exit (bpstat_clear_actions); | |
3963 | auto defer_delete_threads | |
3964 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
3965 | ||
3966 | /* Now figure out what to do with the result of the result. */ | |
3967 | handle_inferior_event (ecs); | |
3968 | ||
3969 | if (!ecs->wait_some_more) | |
3970 | { | |
5b6d1e4f | 3971 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
d238133d TT |
3972 | int should_stop = 1; |
3973 | struct thread_info *thr = ecs->event_thread; | |
d6b48e9c | 3974 | |
d238133d | 3975 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3976 | |
d238133d TT |
3977 | if (thr != NULL) |
3978 | { | |
3979 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 3980 | |
d238133d | 3981 | if (thread_fsm != NULL) |
46e3ed7f | 3982 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 3983 | } |
243a9253 | 3984 | |
d238133d TT |
3985 | if (!should_stop) |
3986 | { | |
3987 | keep_going (ecs); | |
3988 | } | |
3989 | else | |
3990 | { | |
46e3ed7f | 3991 | bool should_notify_stop = true; |
d238133d | 3992 | int proceeded = 0; |
1840d81a | 3993 | |
d238133d | 3994 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 3995 | |
d238133d | 3996 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 3997 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 3998 | |
d238133d TT |
3999 | if (should_notify_stop) |
4000 | { | |
4001 | /* We may not find an inferior if this was a process exit. */ | |
4002 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
4003 | proceeded = normal_stop (); | |
4004 | } | |
243a9253 | 4005 | |
d238133d TT |
4006 | if (!proceeded) |
4007 | { | |
4008 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
4009 | cmd_done = 1; | |
4010 | } | |
873657b9 PA |
4011 | |
4012 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
4013 | previously selected thread is gone. We have two | |
4014 | choices - switch to no thread selected, or restore the | |
4015 | previously selected thread (now exited). We chose the | |
4016 | later, just because that's what GDB used to do. After | |
4017 | this, "info threads" says "The current thread <Thread | |
4018 | ID 2> has terminated." instead of "No thread | |
4019 | selected.". */ | |
4020 | if (!non_stop | |
4021 | && cmd_done | |
4022 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
4023 | restore_thread.dont_restore (); | |
d238133d TT |
4024 | } |
4025 | } | |
4f8d22e3 | 4026 | |
d238133d TT |
4027 | defer_delete_threads.release (); |
4028 | defer_bpstat_clear.release (); | |
29f49a6a | 4029 | |
d238133d TT |
4030 | /* No error, don't finish the thread states yet. */ |
4031 | finish_state.release (); | |
731f534f | 4032 | |
d238133d TT |
4033 | /* This scope is used to ensure that readline callbacks are |
4034 | reinstalled here. */ | |
4035 | } | |
4f8d22e3 | 4036 | |
3b12939d PA |
4037 | /* If a UI was in sync execution mode, and now isn't, restore its |
4038 | prompt (a synchronous execution command has finished, and we're | |
4039 | ready for input). */ | |
4040 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4041 | |
4042 | if (cmd_done | |
0f641c01 | 4043 | && exec_done_display_p |
00431a78 PA |
4044 | && (inferior_ptid == null_ptid |
4045 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 4046 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
4047 | } |
4048 | ||
29734269 SM |
4049 | /* See infrun.h. */ |
4050 | ||
edb3359d | 4051 | void |
29734269 SM |
4052 | set_step_info (thread_info *tp, struct frame_info *frame, |
4053 | struct symtab_and_line sal) | |
edb3359d | 4054 | { |
29734269 SM |
4055 | /* This can be removed once this function no longer implicitly relies on the |
4056 | inferior_ptid value. */ | |
4057 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4058 | |
16c381f0 JK |
4059 | tp->control.step_frame_id = get_frame_id (frame); |
4060 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4061 | |
4062 | tp->current_symtab = sal.symtab; | |
4063 | tp->current_line = sal.line; | |
4064 | } | |
4065 | ||
0d1e5fa7 PA |
4066 | /* Clear context switchable stepping state. */ |
4067 | ||
4068 | void | |
4e1c45ea | 4069 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4070 | { |
7f5ef605 | 4071 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4072 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4073 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4074 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4075 | } |
4076 | ||
ab1ddbcf | 4077 | /* See infrun.h. */ |
c32c64b7 | 4078 | |
6efcd9a8 | 4079 | void |
5b6d1e4f PA |
4080 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
4081 | target_waitstatus status) | |
c32c64b7 | 4082 | { |
5b6d1e4f | 4083 | target_last_proc_target = target; |
c32c64b7 DE |
4084 | target_last_wait_ptid = ptid; |
4085 | target_last_waitstatus = status; | |
4086 | } | |
4087 | ||
ab1ddbcf | 4088 | /* See infrun.h. */ |
e02bc4cc DS |
4089 | |
4090 | void | |
5b6d1e4f PA |
4091 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4092 | target_waitstatus *status) | |
e02bc4cc | 4093 | { |
5b6d1e4f PA |
4094 | if (target != nullptr) |
4095 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4096 | if (ptid != nullptr) |
4097 | *ptid = target_last_wait_ptid; | |
4098 | if (status != nullptr) | |
4099 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4100 | } |
4101 | ||
ab1ddbcf PA |
4102 | /* See infrun.h. */ |
4103 | ||
ac264b3b MS |
4104 | void |
4105 | nullify_last_target_wait_ptid (void) | |
4106 | { | |
5b6d1e4f | 4107 | target_last_proc_target = nullptr; |
ac264b3b | 4108 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4109 | target_last_waitstatus = {}; |
ac264b3b MS |
4110 | } |
4111 | ||
dcf4fbde | 4112 | /* Switch thread contexts. */ |
dd80620e MS |
4113 | |
4114 | static void | |
00431a78 | 4115 | context_switch (execution_control_state *ecs) |
dd80620e | 4116 | { |
4100594e | 4117 | if (ecs->ptid != inferior_ptid |
5b6d1e4f PA |
4118 | && (inferior_ptid == null_ptid |
4119 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 | 4120 | { |
4100594e SM |
4121 | infrun_log_debug ("Switching context from %s to %s", |
4122 | target_pid_to_str (inferior_ptid).c_str (), | |
4123 | target_pid_to_str (ecs->ptid).c_str ()); | |
fd48f117 DJ |
4124 | } |
4125 | ||
00431a78 | 4126 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4127 | } |
4128 | ||
d8dd4d5f PA |
4129 | /* If the target can't tell whether we've hit breakpoints |
4130 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4131 | check whether that could have been caused by a breakpoint. If so, | |
4132 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4133 | ||
4fa8626c | 4134 | static void |
d8dd4d5f PA |
4135 | adjust_pc_after_break (struct thread_info *thread, |
4136 | struct target_waitstatus *ws) | |
4fa8626c | 4137 | { |
24a73cce UW |
4138 | struct regcache *regcache; |
4139 | struct gdbarch *gdbarch; | |
118e6252 | 4140 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4141 | |
4fa8626c DJ |
4142 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4143 | we aren't, just return. | |
9709f61c DJ |
4144 | |
4145 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4146 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4147 | implemented by software breakpoints should be handled through the normal | |
4148 | breakpoint layer. | |
8fb3e588 | 4149 | |
4fa8626c DJ |
4150 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4151 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4152 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4153 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4154 | generates these signals at breakpoints (the code has been in GDB since at | |
4155 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4156 | |
e6cf7916 UW |
4157 | In earlier versions of GDB, a target with |
4158 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4159 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4160 | target with both of these set in GDB history, and it seems unlikely to be | |
4161 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4162 | |
d8dd4d5f | 4163 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4164 | return; |
4165 | ||
d8dd4d5f | 4166 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4167 | return; |
4168 | ||
4058b839 PA |
4169 | /* In reverse execution, when a breakpoint is hit, the instruction |
4170 | under it has already been de-executed. The reported PC always | |
4171 | points at the breakpoint address, so adjusting it further would | |
4172 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4173 | architecture: | |
4174 | ||
4175 | B1 0x08000000 : INSN1 | |
4176 | B2 0x08000001 : INSN2 | |
4177 | 0x08000002 : INSN3 | |
4178 | PC -> 0x08000003 : INSN4 | |
4179 | ||
4180 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4181 | from that point should hit B2 as below. Reading the PC when the | |
4182 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4183 | been de-executed already. | |
4184 | ||
4185 | B1 0x08000000 : INSN1 | |
4186 | B2 PC -> 0x08000001 : INSN2 | |
4187 | 0x08000002 : INSN3 | |
4188 | 0x08000003 : INSN4 | |
4189 | ||
4190 | We can't apply the same logic as for forward execution, because | |
4191 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4192 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4193 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4194 | behaviour. */ | |
4195 | if (execution_direction == EXEC_REVERSE) | |
4196 | return; | |
4197 | ||
1cf4d951 PA |
4198 | /* If the target can tell whether the thread hit a SW breakpoint, |
4199 | trust it. Targets that can tell also adjust the PC | |
4200 | themselves. */ | |
4201 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4202 | return; | |
4203 | ||
4204 | /* Note that relying on whether a breakpoint is planted in memory to | |
4205 | determine this can fail. E.g,. the breakpoint could have been | |
4206 | removed since. Or the thread could have been told to step an | |
4207 | instruction the size of a breakpoint instruction, and only | |
4208 | _after_ was a breakpoint inserted at its address. */ | |
4209 | ||
24a73cce UW |
4210 | /* If this target does not decrement the PC after breakpoints, then |
4211 | we have nothing to do. */ | |
00431a78 | 4212 | regcache = get_thread_regcache (thread); |
ac7936df | 4213 | gdbarch = regcache->arch (); |
118e6252 | 4214 | |
527a273a | 4215 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4216 | if (decr_pc == 0) |
24a73cce UW |
4217 | return; |
4218 | ||
8b86c959 | 4219 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4220 | |
8aad930b AC |
4221 | /* Find the location where (if we've hit a breakpoint) the |
4222 | breakpoint would be. */ | |
118e6252 | 4223 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4224 | |
1cf4d951 PA |
4225 | /* If the target can't tell whether a software breakpoint triggered, |
4226 | fallback to figuring it out based on breakpoints we think were | |
4227 | inserted in the target, and on whether the thread was stepped or | |
4228 | continued. */ | |
4229 | ||
1c5cfe86 PA |
4230 | /* Check whether there actually is a software breakpoint inserted at |
4231 | that location. | |
4232 | ||
4233 | If in non-stop mode, a race condition is possible where we've | |
4234 | removed a breakpoint, but stop events for that breakpoint were | |
4235 | already queued and arrive later. To suppress those spurious | |
4236 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4237 | and retire them after a number of stop events are reported. Note |
4238 | this is an heuristic and can thus get confused. The real fix is | |
4239 | to get the "stopped by SW BP and needs adjustment" info out of | |
4240 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4241 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4242 | || (target_is_non_stop_p () |
4243 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4244 | { |
07036511 | 4245 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4246 | |
8213266a | 4247 | if (record_full_is_used ()) |
07036511 TT |
4248 | restore_operation_disable.emplace |
4249 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4250 | |
1c0fdd0e UW |
4251 | /* When using hardware single-step, a SIGTRAP is reported for both |
4252 | a completed single-step and a software breakpoint. Need to | |
4253 | differentiate between the two, as the latter needs adjusting | |
4254 | but the former does not. | |
4255 | ||
4256 | The SIGTRAP can be due to a completed hardware single-step only if | |
4257 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4258 | - this thread is currently being stepped |
4259 | ||
4260 | If any of these events did not occur, we must have stopped due | |
4261 | to hitting a software breakpoint, and have to back up to the | |
4262 | breakpoint address. | |
4263 | ||
4264 | As a special case, we could have hardware single-stepped a | |
4265 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4266 | we also need to back up to the breakpoint address. */ | |
4267 | ||
d8dd4d5f PA |
4268 | if (thread_has_single_step_breakpoints_set (thread) |
4269 | || !currently_stepping (thread) | |
4270 | || (thread->stepped_breakpoint | |
4271 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4272 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4273 | } |
4fa8626c DJ |
4274 | } |
4275 | ||
edb3359d DJ |
4276 | static int |
4277 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4278 | { | |
4279 | for (frame = get_prev_frame (frame); | |
4280 | frame != NULL; | |
4281 | frame = get_prev_frame (frame)) | |
4282 | { | |
4283 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4284 | return 1; | |
4285 | if (get_frame_type (frame) != INLINE_FRAME) | |
4286 | break; | |
4287 | } | |
4288 | ||
4289 | return 0; | |
4290 | } | |
4291 | ||
4a4c04f1 BE |
4292 | /* Look for an inline frame that is marked for skip. |
4293 | If PREV_FRAME is TRUE start at the previous frame, | |
4294 | otherwise start at the current frame. Stop at the | |
4295 | first non-inline frame, or at the frame where the | |
4296 | step started. */ | |
4297 | ||
4298 | static bool | |
4299 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4300 | { | |
4301 | struct frame_info *frame = get_current_frame (); | |
4302 | ||
4303 | if (prev_frame) | |
4304 | frame = get_prev_frame (frame); | |
4305 | ||
4306 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4307 | { | |
4308 | const char *fn = NULL; | |
4309 | symtab_and_line sal; | |
4310 | struct symbol *sym; | |
4311 | ||
4312 | if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id)) | |
4313 | break; | |
4314 | if (get_frame_type (frame) != INLINE_FRAME) | |
4315 | break; | |
4316 | ||
4317 | sal = find_frame_sal (frame); | |
4318 | sym = get_frame_function (frame); | |
4319 | ||
4320 | if (sym != NULL) | |
4321 | fn = sym->print_name (); | |
4322 | ||
4323 | if (sal.line != 0 | |
4324 | && function_name_is_marked_for_skip (fn, sal)) | |
4325 | return true; | |
4326 | } | |
4327 | ||
4328 | return false; | |
4329 | } | |
4330 | ||
c65d6b55 PA |
4331 | /* If the event thread has the stop requested flag set, pretend it |
4332 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4333 | target_stop). */ | |
4334 | ||
4335 | static bool | |
4336 | handle_stop_requested (struct execution_control_state *ecs) | |
4337 | { | |
4338 | if (ecs->event_thread->stop_requested) | |
4339 | { | |
4340 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4341 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4342 | handle_signal_stop (ecs); | |
4343 | return true; | |
4344 | } | |
4345 | return false; | |
4346 | } | |
4347 | ||
a96d9b2e SDJ |
4348 | /* Auxiliary function that handles syscall entry/return events. |
4349 | It returns 1 if the inferior should keep going (and GDB | |
4350 | should ignore the event), or 0 if the event deserves to be | |
4351 | processed. */ | |
ca2163eb | 4352 | |
a96d9b2e | 4353 | static int |
ca2163eb | 4354 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4355 | { |
ca2163eb | 4356 | struct regcache *regcache; |
ca2163eb PA |
4357 | int syscall_number; |
4358 | ||
00431a78 | 4359 | context_switch (ecs); |
ca2163eb | 4360 | |
00431a78 | 4361 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4362 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4363 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4364 | |
a96d9b2e SDJ |
4365 | if (catch_syscall_enabled () > 0 |
4366 | && catching_syscall_number (syscall_number) > 0) | |
4367 | { | |
4100594e | 4368 | infrun_log_debug ("syscall number=%d", syscall_number); |
a96d9b2e | 4369 | |
16c381f0 | 4370 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4371 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4372 | ecs->event_thread->suspend.stop_pc, |
4373 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4374 | |
c65d6b55 PA |
4375 | if (handle_stop_requested (ecs)) |
4376 | return 0; | |
4377 | ||
ce12b012 | 4378 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4379 | { |
4380 | /* Catchpoint hit. */ | |
ca2163eb PA |
4381 | return 0; |
4382 | } | |
a96d9b2e | 4383 | } |
ca2163eb | 4384 | |
c65d6b55 PA |
4385 | if (handle_stop_requested (ecs)) |
4386 | return 0; | |
4387 | ||
ca2163eb | 4388 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb PA |
4389 | keep_going (ecs); |
4390 | return 1; | |
a96d9b2e SDJ |
4391 | } |
4392 | ||
7e324e48 GB |
4393 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4394 | ||
4395 | static void | |
4396 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4397 | struct execution_control_state *ecs) | |
4398 | { | |
4399 | if (!ecs->stop_func_filled_in) | |
4400 | { | |
98a617f8 KB |
4401 | const block *block; |
4402 | ||
7e324e48 GB |
4403 | /* Don't care about return value; stop_func_start and stop_func_name |
4404 | will both be 0 if it doesn't work. */ | |
98a617f8 KB |
4405 | find_pc_partial_function (ecs->event_thread->suspend.stop_pc, |
4406 | &ecs->stop_func_name, | |
4407 | &ecs->stop_func_start, | |
4408 | &ecs->stop_func_end, | |
4409 | &block); | |
4410 | ||
4411 | /* The call to find_pc_partial_function, above, will set | |
4412 | stop_func_start and stop_func_end to the start and end | |
4413 | of the range containing the stop pc. If this range | |
4414 | contains the entry pc for the block (which is always the | |
4415 | case for contiguous blocks), advance stop_func_start past | |
4416 | the function's start offset and entrypoint. Note that | |
4417 | stop_func_start is NOT advanced when in a range of a | |
4418 | non-contiguous block that does not contain the entry pc. */ | |
4419 | if (block != nullptr | |
4420 | && ecs->stop_func_start <= BLOCK_ENTRY_PC (block) | |
4421 | && BLOCK_ENTRY_PC (block) < ecs->stop_func_end) | |
4422 | { | |
4423 | ecs->stop_func_start | |
4424 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4425 | ||
4426 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4427 | ecs->stop_func_start | |
4428 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4429 | } | |
591a12a1 | 4430 | |
7e324e48 GB |
4431 | ecs->stop_func_filled_in = 1; |
4432 | } | |
4433 | } | |
4434 | ||
4f5d7f63 | 4435 | |
00431a78 | 4436 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4437 | |
4438 | static enum stop_kind | |
00431a78 | 4439 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4440 | { |
5b6d1e4f | 4441 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4442 | |
4443 | gdb_assert (inf != NULL); | |
4444 | return inf->control.stop_soon; | |
4445 | } | |
4446 | ||
5b6d1e4f PA |
4447 | /* Poll for one event out of the current target. Store the resulting |
4448 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4449 | |
4450 | static ptid_t | |
5b6d1e4f | 4451 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4452 | { |
4453 | ptid_t event_ptid; | |
372316f1 PA |
4454 | |
4455 | overlay_cache_invalid = 1; | |
4456 | ||
4457 | /* Flush target cache before starting to handle each event. | |
4458 | Target was running and cache could be stale. This is just a | |
4459 | heuristic. Running threads may modify target memory, but we | |
4460 | don't get any event. */ | |
4461 | target_dcache_invalidate (); | |
4462 | ||
4463 | if (deprecated_target_wait_hook) | |
5b6d1e4f | 4464 | event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 | 4465 | else |
5b6d1e4f | 4466 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4467 | |
4468 | if (debug_infrun) | |
5b6d1e4f | 4469 | print_target_wait_results (minus_one_ptid, event_ptid, ws); |
372316f1 PA |
4470 | |
4471 | return event_ptid; | |
4472 | } | |
4473 | ||
5b6d1e4f PA |
4474 | /* An event reported by wait_one. */ |
4475 | ||
4476 | struct wait_one_event | |
4477 | { | |
4478 | /* The target the event came out of. */ | |
4479 | process_stratum_target *target; | |
4480 | ||
4481 | /* The PTID the event was for. */ | |
4482 | ptid_t ptid; | |
4483 | ||
4484 | /* The waitstatus. */ | |
4485 | target_waitstatus ws; | |
4486 | }; | |
4487 | ||
4488 | /* Wait for one event out of any target. */ | |
4489 | ||
4490 | static wait_one_event | |
4491 | wait_one () | |
4492 | { | |
4493 | while (1) | |
4494 | { | |
4495 | for (inferior *inf : all_inferiors ()) | |
4496 | { | |
4497 | process_stratum_target *target = inf->process_target (); | |
4498 | if (target == NULL | |
4499 | || !target->is_async_p () | |
4500 | || !target->threads_executing) | |
4501 | continue; | |
4502 | ||
4503 | switch_to_inferior_no_thread (inf); | |
4504 | ||
4505 | wait_one_event event; | |
4506 | event.target = target; | |
4507 | event.ptid = poll_one_curr_target (&event.ws); | |
4508 | ||
4509 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4510 | { | |
4511 | /* If nothing is resumed, remove the target from the | |
4512 | event loop. */ | |
4513 | target_async (0); | |
4514 | } | |
4515 | else if (event.ws.kind != TARGET_WAITKIND_IGNORE) | |
4516 | return event; | |
4517 | } | |
4518 | ||
4519 | /* Block waiting for some event. */ | |
4520 | ||
4521 | fd_set readfds; | |
4522 | int nfds = 0; | |
4523 | ||
4524 | FD_ZERO (&readfds); | |
4525 | ||
4526 | for (inferior *inf : all_inferiors ()) | |
4527 | { | |
4528 | process_stratum_target *target = inf->process_target (); | |
4529 | if (target == NULL | |
4530 | || !target->is_async_p () | |
4531 | || !target->threads_executing) | |
4532 | continue; | |
4533 | ||
4534 | int fd = target->async_wait_fd (); | |
4535 | FD_SET (fd, &readfds); | |
4536 | if (nfds <= fd) | |
4537 | nfds = fd + 1; | |
4538 | } | |
4539 | ||
4540 | if (nfds == 0) | |
4541 | { | |
4542 | /* No waitable targets left. All must be stopped. */ | |
4543 | return {NULL, minus_one_ptid, {TARGET_WAITKIND_NO_RESUMED}}; | |
4544 | } | |
4545 | ||
4546 | QUIT; | |
4547 | ||
4548 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4549 | if (numfds < 0) | |
4550 | { | |
4551 | if (errno == EINTR) | |
4552 | continue; | |
4553 | else | |
4554 | perror_with_name ("interruptible_select"); | |
4555 | } | |
4556 | } | |
4557 | } | |
4558 | ||
372316f1 PA |
4559 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID |
4560 | instead of the current thread. */ | |
4561 | #define THREAD_STOPPED_BY(REASON) \ | |
4562 | static int \ | |
4563 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4564 | { \ | |
2989a365 | 4565 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); \ |
372316f1 PA |
4566 | inferior_ptid = ptid; \ |
4567 | \ | |
2989a365 | 4568 | return target_stopped_by_ ## REASON (); \ |
372316f1 PA |
4569 | } |
4570 | ||
4571 | /* Generate thread_stopped_by_watchpoint. */ | |
4572 | THREAD_STOPPED_BY (watchpoint) | |
4573 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4574 | THREAD_STOPPED_BY (sw_breakpoint) | |
4575 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4576 | THREAD_STOPPED_BY (hw_breakpoint) | |
4577 | ||
372316f1 PA |
4578 | /* Save the thread's event and stop reason to process it later. */ |
4579 | ||
4580 | static void | |
5b6d1e4f | 4581 | save_waitstatus (struct thread_info *tp, const target_waitstatus *ws) |
372316f1 | 4582 | { |
4100594e SM |
4583 | infrun_log_debug ("saving status %s for %d.%ld.%ld", |
4584 | target_waitstatus_to_string (ws).c_str (), | |
4585 | tp->ptid.pid (), | |
4586 | tp->ptid.lwp (), | |
4587 | tp->ptid.tid ()); | |
372316f1 PA |
4588 | |
4589 | /* Record for later. */ | |
4590 | tp->suspend.waitstatus = *ws; | |
4591 | tp->suspend.waitstatus_pending_p = 1; | |
4592 | ||
00431a78 | 4593 | struct regcache *regcache = get_thread_regcache (tp); |
8b86c959 | 4594 | const address_space *aspace = regcache->aspace (); |
372316f1 PA |
4595 | |
4596 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4597 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4598 | { | |
4599 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4600 | ||
4601 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4602 | ||
4603 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4604 | { | |
4605 | tp->suspend.stop_reason | |
4606 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4607 | } | |
4608 | else if (target_supports_stopped_by_sw_breakpoint () | |
4609 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4610 | { | |
4611 | tp->suspend.stop_reason | |
4612 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4613 | } | |
4614 | else if (target_supports_stopped_by_hw_breakpoint () | |
4615 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4616 | { | |
4617 | tp->suspend.stop_reason | |
4618 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4619 | } | |
4620 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4621 | && hardware_breakpoint_inserted_here_p (aspace, | |
4622 | pc)) | |
4623 | { | |
4624 | tp->suspend.stop_reason | |
4625 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4626 | } | |
4627 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4628 | && software_breakpoint_inserted_here_p (aspace, | |
4629 | pc)) | |
4630 | { | |
4631 | tp->suspend.stop_reason | |
4632 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4633 | } | |
4634 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4635 | && currently_stepping (tp)) | |
4636 | { | |
4637 | tp->suspend.stop_reason | |
4638 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4639 | } | |
4640 | } | |
4641 | } | |
4642 | ||
293b3ebc TBA |
4643 | /* Mark the non-executing threads accordingly. In all-stop, all |
4644 | threads of all processes are stopped when we get any event | |
4645 | reported. In non-stop mode, only the event thread stops. */ | |
4646 | ||
4647 | static void | |
4648 | mark_non_executing_threads (process_stratum_target *target, | |
4649 | ptid_t event_ptid, | |
4650 | struct target_waitstatus ws) | |
4651 | { | |
4652 | ptid_t mark_ptid; | |
4653 | ||
4654 | if (!target_is_non_stop_p ()) | |
4655 | mark_ptid = minus_one_ptid; | |
4656 | else if (ws.kind == TARGET_WAITKIND_SIGNALLED | |
4657 | || ws.kind == TARGET_WAITKIND_EXITED) | |
4658 | { | |
4659 | /* If we're handling a process exit in non-stop mode, even | |
4660 | though threads haven't been deleted yet, one would think | |
4661 | that there is nothing to do, as threads of the dead process | |
4662 | will be soon deleted, and threads of any other process were | |
4663 | left running. However, on some targets, threads survive a | |
4664 | process exit event. E.g., for the "checkpoint" command, | |
4665 | when the current checkpoint/fork exits, linux-fork.c | |
4666 | automatically switches to another fork from within | |
4667 | target_mourn_inferior, by associating the same | |
4668 | inferior/thread to another fork. We haven't mourned yet at | |
4669 | this point, but we must mark any threads left in the | |
4670 | process as not-executing so that finish_thread_state marks | |
4671 | them stopped (in the user's perspective) if/when we present | |
4672 | the stop to the user. */ | |
4673 | mark_ptid = ptid_t (event_ptid.pid ()); | |
4674 | } | |
4675 | else | |
4676 | mark_ptid = event_ptid; | |
4677 | ||
4678 | set_executing (target, mark_ptid, false); | |
4679 | ||
4680 | /* Likewise the resumed flag. */ | |
4681 | set_resumed (target, mark_ptid, false); | |
4682 | } | |
4683 | ||
6efcd9a8 | 4684 | /* See infrun.h. */ |
372316f1 | 4685 | |
6efcd9a8 | 4686 | void |
372316f1 PA |
4687 | stop_all_threads (void) |
4688 | { | |
4689 | /* We may need multiple passes to discover all threads. */ | |
4690 | int pass; | |
4691 | int iterations = 0; | |
372316f1 | 4692 | |
53cccef1 | 4693 | gdb_assert (exists_non_stop_target ()); |
372316f1 | 4694 | |
4100594e | 4695 | infrun_log_debug ("stop_all_threads"); |
372316f1 | 4696 | |
00431a78 | 4697 | scoped_restore_current_thread restore_thread; |
372316f1 | 4698 | |
6ad82919 TBA |
4699 | /* Enable thread events of all targets. */ |
4700 | for (auto *target : all_non_exited_process_targets ()) | |
4701 | { | |
4702 | switch_to_target_no_thread (target); | |
4703 | target_thread_events (true); | |
4704 | } | |
4705 | ||
4706 | SCOPE_EXIT | |
4707 | { | |
4708 | /* Disable thread events of all targets. */ | |
4709 | for (auto *target : all_non_exited_process_targets ()) | |
4710 | { | |
4711 | switch_to_target_no_thread (target); | |
4712 | target_thread_events (false); | |
4713 | } | |
4714 | ||
4100594e SM |
4715 | |
4716 | infrun_log_debug ("stop_all_threads done"); | |
6ad82919 | 4717 | }; |
65706a29 | 4718 | |
372316f1 PA |
4719 | /* Request threads to stop, and then wait for the stops. Because |
4720 | threads we already know about can spawn more threads while we're | |
4721 | trying to stop them, and we only learn about new threads when we | |
4722 | update the thread list, do this in a loop, and keep iterating | |
4723 | until two passes find no threads that need to be stopped. */ | |
4724 | for (pass = 0; pass < 2; pass++, iterations++) | |
4725 | { | |
4100594e SM |
4726 | infrun_log_debug ("stop_all_threads, pass=%d, iterations=%d", |
4727 | pass, iterations); | |
372316f1 PA |
4728 | while (1) |
4729 | { | |
29d6859f | 4730 | int waits_needed = 0; |
372316f1 | 4731 | |
a05575d3 TBA |
4732 | for (auto *target : all_non_exited_process_targets ()) |
4733 | { | |
4734 | switch_to_target_no_thread (target); | |
4735 | update_thread_list (); | |
4736 | } | |
372316f1 PA |
4737 | |
4738 | /* Go through all threads looking for threads that we need | |
4739 | to tell the target to stop. */ | |
08036331 | 4740 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 4741 | { |
53cccef1 TBA |
4742 | /* For a single-target setting with an all-stop target, |
4743 | we would not even arrive here. For a multi-target | |
4744 | setting, until GDB is able to handle a mixture of | |
4745 | all-stop and non-stop targets, simply skip all-stop | |
4746 | targets' threads. This should be fine due to the | |
4747 | protection of 'check_multi_target_resumption'. */ | |
4748 | ||
4749 | switch_to_thread_no_regs (t); | |
4750 | if (!target_is_non_stop_p ()) | |
4751 | continue; | |
4752 | ||
372316f1 PA |
4753 | if (t->executing) |
4754 | { | |
4755 | /* If already stopping, don't request a stop again. | |
4756 | We just haven't seen the notification yet. */ | |
4757 | if (!t->stop_requested) | |
4758 | { | |
4100594e SM |
4759 | infrun_log_debug (" %s executing, need stop", |
4760 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4761 | target_stop (t->ptid); |
4762 | t->stop_requested = 1; | |
4763 | } | |
4764 | else | |
4765 | { | |
4100594e SM |
4766 | infrun_log_debug (" %s executing, already stopping", |
4767 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4768 | } |
4769 | ||
4770 | if (t->stop_requested) | |
29d6859f | 4771 | waits_needed++; |
372316f1 PA |
4772 | } |
4773 | else | |
4774 | { | |
4100594e SM |
4775 | infrun_log_debug (" %s not executing", |
4776 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4777 | |
4778 | /* The thread may be not executing, but still be | |
4779 | resumed with a pending status to process. */ | |
719546c4 | 4780 | t->resumed = false; |
372316f1 PA |
4781 | } |
4782 | } | |
4783 | ||
29d6859f | 4784 | if (waits_needed == 0) |
372316f1 PA |
4785 | break; |
4786 | ||
4787 | /* If we find new threads on the second iteration, restart | |
4788 | over. We want to see two iterations in a row with all | |
4789 | threads stopped. */ | |
4790 | if (pass > 0) | |
4791 | pass = -1; | |
4792 | ||
29d6859f | 4793 | for (int i = 0; i < waits_needed; i++) |
c29705b7 | 4794 | { |
29d6859f | 4795 | wait_one_event event = wait_one (); |
a05575d3 | 4796 | |
4100594e SM |
4797 | infrun_log_debug ("%s %s\n", |
4798 | target_waitstatus_to_string (&event.ws).c_str (), | |
4799 | target_pid_to_str (event.ptid).c_str ()); | |
a05575d3 | 4800 | |
29d6859f | 4801 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) |
a05575d3 | 4802 | { |
29d6859f LM |
4803 | /* All resumed threads exited. */ |
4804 | break; | |
a05575d3 | 4805 | } |
29d6859f LM |
4806 | else if (event.ws.kind == TARGET_WAITKIND_THREAD_EXITED |
4807 | || event.ws.kind == TARGET_WAITKIND_EXITED | |
4808 | || event.ws.kind == TARGET_WAITKIND_SIGNALLED) | |
6efcd9a8 | 4809 | { |
29d6859f | 4810 | /* One thread/process exited/signalled. */ |
6efcd9a8 | 4811 | |
29d6859f | 4812 | thread_info *t = nullptr; |
372316f1 | 4813 | |
29d6859f LM |
4814 | /* The target may have reported just a pid. If so, try |
4815 | the first non-exited thread. */ | |
4816 | if (event.ptid.is_pid ()) | |
372316f1 | 4817 | { |
29d6859f LM |
4818 | int pid = event.ptid.pid (); |
4819 | inferior *inf = find_inferior_pid (event.target, pid); | |
4820 | for (thread_info *tp : inf->non_exited_threads ()) | |
372316f1 | 4821 | { |
29d6859f LM |
4822 | t = tp; |
4823 | break; | |
372316f1 | 4824 | } |
29d6859f LM |
4825 | |
4826 | /* If there is no available thread, the event would | |
4827 | have to be appended to a per-inferior event list, | |
4828 | which does not exist (and if it did, we'd have | |
4829 | to adjust run control command to be able to | |
4830 | resume such an inferior). We assert here instead | |
4831 | of going into an infinite loop. */ | |
4832 | gdb_assert (t != nullptr); | |
4833 | ||
4100594e SM |
4834 | infrun_log_debug ("using %s\n", |
4835 | target_pid_to_str (t->ptid).c_str ()); | |
29d6859f LM |
4836 | } |
4837 | else | |
4838 | { | |
4839 | t = find_thread_ptid (event.target, event.ptid); | |
4840 | /* Check if this is the first time we see this thread. | |
4841 | Don't bother adding if it individually exited. */ | |
4842 | if (t == nullptr | |
4843 | && event.ws.kind != TARGET_WAITKIND_THREAD_EXITED) | |
4844 | t = add_thread (event.target, event.ptid); | |
4845 | } | |
4846 | ||
4847 | if (t != nullptr) | |
4848 | { | |
4849 | /* Set the threads as non-executing to avoid | |
4850 | another stop attempt on them. */ | |
4851 | switch_to_thread_no_regs (t); | |
4852 | mark_non_executing_threads (event.target, event.ptid, | |
4853 | event.ws); | |
4854 | save_waitstatus (t, &event.ws); | |
4855 | t->stop_requested = false; | |
372316f1 PA |
4856 | } |
4857 | } | |
4858 | else | |
4859 | { | |
29d6859f LM |
4860 | thread_info *t = find_thread_ptid (event.target, event.ptid); |
4861 | if (t == NULL) | |
4862 | t = add_thread (event.target, event.ptid); | |
372316f1 | 4863 | |
29d6859f LM |
4864 | t->stop_requested = 0; |
4865 | t->executing = 0; | |
4866 | t->resumed = false; | |
4867 | t->control.may_range_step = 0; | |
4868 | ||
4869 | /* This may be the first time we see the inferior report | |
4870 | a stop. */ | |
4871 | inferior *inf = find_inferior_ptid (event.target, event.ptid); | |
4872 | if (inf->needs_setup) | |
372316f1 | 4873 | { |
29d6859f LM |
4874 | switch_to_thread_no_regs (t); |
4875 | setup_inferior (0); | |
372316f1 PA |
4876 | } |
4877 | ||
29d6859f LM |
4878 | if (event.ws.kind == TARGET_WAITKIND_STOPPED |
4879 | && event.ws.value.sig == GDB_SIGNAL_0) | |
372316f1 | 4880 | { |
29d6859f LM |
4881 | /* We caught the event that we intended to catch, so |
4882 | there's no event pending. */ | |
4883 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4884 | t->suspend.waitstatus_pending_p = 0; | |
4885 | ||
4886 | if (displaced_step_fixup (t, GDB_SIGNAL_0) < 0) | |
4887 | { | |
4888 | /* Add it back to the step-over queue. */ | |
4100594e SM |
4889 | infrun_log_debug ("displaced-step of %s " |
4890 | "canceled: adding back to the " | |
4891 | "step-over queue\n", | |
4892 | target_pid_to_str (t->ptid).c_str ()); | |
4893 | ||
29d6859f LM |
4894 | t->control.trap_expected = 0; |
4895 | thread_step_over_chain_enqueue (t); | |
4896 | } | |
372316f1 | 4897 | } |
29d6859f LM |
4898 | else |
4899 | { | |
4900 | enum gdb_signal sig; | |
4901 | struct regcache *regcache; | |
372316f1 | 4902 | |
29d6859f LM |
4903 | if (debug_infrun) |
4904 | { | |
4905 | std::string statstr = target_waitstatus_to_string (&event.ws); | |
372316f1 | 4906 | |
4100594e SM |
4907 | infrun_log_debug ("target_wait %s, saving " |
4908 | "status for %d.%ld.%ld\n", | |
4909 | statstr.c_str (), | |
4910 | t->ptid.pid (), | |
4911 | t->ptid.lwp (), | |
4912 | t->ptid.tid ()); | |
29d6859f LM |
4913 | } |
4914 | ||
4915 | /* Record for later. */ | |
4916 | save_waitstatus (t, &event.ws); | |
4917 | ||
4918 | sig = (event.ws.kind == TARGET_WAITKIND_STOPPED | |
4919 | ? event.ws.value.sig : GDB_SIGNAL_0); | |
4920 | ||
4921 | if (displaced_step_fixup (t, sig) < 0) | |
4922 | { | |
4923 | /* Add it back to the step-over queue. */ | |
4924 | t->control.trap_expected = 0; | |
4925 | thread_step_over_chain_enqueue (t); | |
4926 | } | |
4927 | ||
4928 | regcache = get_thread_regcache (t); | |
4929 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4930 | ||
4100594e SM |
4931 | infrun_log_debug ("saved stop_pc=%s for %s " |
4932 | "(currently_stepping=%d)\n", | |
4933 | paddress (target_gdbarch (), | |
4934 | t->suspend.stop_pc), | |
4935 | target_pid_to_str (t->ptid).c_str (), | |
4936 | currently_stepping (t)); | |
372316f1 PA |
4937 | } |
4938 | } | |
4939 | } | |
4940 | } | |
4941 | } | |
372316f1 PA |
4942 | } |
4943 | ||
f4836ba9 PA |
4944 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4945 | ||
4946 | static int | |
4947 | handle_no_resumed (struct execution_control_state *ecs) | |
4948 | { | |
3b12939d | 4949 | if (target_can_async_p ()) |
f4836ba9 | 4950 | { |
3b12939d | 4951 | int any_sync = 0; |
f4836ba9 | 4952 | |
2dab0c7b | 4953 | for (ui *ui : all_uis ()) |
3b12939d PA |
4954 | { |
4955 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4956 | { | |
4957 | any_sync = 1; | |
4958 | break; | |
4959 | } | |
4960 | } | |
4961 | if (!any_sync) | |
4962 | { | |
4963 | /* There were no unwaited-for children left in the target, but, | |
4964 | we're not synchronously waiting for events either. Just | |
4965 | ignore. */ | |
4966 | ||
4100594e | 4967 | infrun_log_debug ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)"); |
3b12939d PA |
4968 | prepare_to_wait (ecs); |
4969 | return 1; | |
4970 | } | |
f4836ba9 PA |
4971 | } |
4972 | ||
4973 | /* Otherwise, if we were running a synchronous execution command, we | |
4974 | may need to cancel it and give the user back the terminal. | |
4975 | ||
4976 | In non-stop mode, the target can't tell whether we've already | |
4977 | consumed previous stop events, so it can end up sending us a | |
4978 | no-resumed event like so: | |
4979 | ||
4980 | #0 - thread 1 is left stopped | |
4981 | ||
4982 | #1 - thread 2 is resumed and hits breakpoint | |
4983 | -> TARGET_WAITKIND_STOPPED | |
4984 | ||
4985 | #2 - thread 3 is resumed and exits | |
4986 | this is the last resumed thread, so | |
4987 | -> TARGET_WAITKIND_NO_RESUMED | |
4988 | ||
4989 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4990 | it. | |
4991 | ||
4992 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4993 | thread 2 is now resumed, so the event should be ignored. | |
4994 | ||
4995 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4996 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4997 | event. But it could be that the event meant that thread 2 itself | |
4998 | (or whatever other thread was the last resumed thread) exited. | |
4999 | ||
5000 | To address this we refresh the thread list and check whether we | |
5001 | have resumed threads _now_. In the example above, this removes | |
5002 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
5003 | ignore this event. If we find no thread resumed, then we cancel | |
5004 | the synchronous command show "no unwaited-for " to the user. */ | |
5005 | update_thread_list (); | |
5006 | ||
5b6d1e4f | 5007 | for (thread_info *thread : all_non_exited_threads (ecs->target)) |
f4836ba9 PA |
5008 | { |
5009 | if (thread->executing | |
5010 | || thread->suspend.waitstatus_pending_p) | |
5011 | { | |
5012 | /* There were no unwaited-for children left in the target at | |
5013 | some point, but there are now. Just ignore. */ | |
4100594e SM |
5014 | infrun_log_debug ("TARGET_WAITKIND_NO_RESUMED " |
5015 | "(ignoring: found resumed)"); | |
f4836ba9 PA |
5016 | prepare_to_wait (ecs); |
5017 | return 1; | |
f4836ba9 PA |
5018 | } |
5019 | } | |
5020 | ||
5021 | /* Go ahead and report the event. */ | |
5022 | return 0; | |
5023 | } | |
5024 | ||
05ba8510 PA |
5025 | /* Given an execution control state that has been freshly filled in by |
5026 | an event from the inferior, figure out what it means and take | |
5027 | appropriate action. | |
5028 | ||
5029 | The alternatives are: | |
5030 | ||
22bcd14b | 5031 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5032 | debugger. |
5033 | ||
5034 | 2) keep_going and return; to wait for the next event (set | |
5035 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5036 | once). */ | |
c906108c | 5037 | |
ec9499be | 5038 | static void |
595915c1 | 5039 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5040 | { |
595915c1 TT |
5041 | /* Make sure that all temporary struct value objects that were |
5042 | created during the handling of the event get deleted at the | |
5043 | end. */ | |
5044 | scoped_value_mark free_values; | |
5045 | ||
d6b48e9c PA |
5046 | enum stop_kind stop_soon; |
5047 | ||
4100594e | 5048 | infrun_log_debug ("%s", target_waitstatus_to_string (&ecs->ws).c_str ()); |
c29705b7 | 5049 | |
28736962 PA |
5050 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
5051 | { | |
5052 | /* We had an event in the inferior, but we are not interested in | |
5053 | handling it at this level. The lower layers have already | |
5054 | done what needs to be done, if anything. | |
5055 | ||
5056 | One of the possible circumstances for this is when the | |
5057 | inferior produces output for the console. The inferior has | |
5058 | not stopped, and we are ignoring the event. Another possible | |
5059 | circumstance is any event which the lower level knows will be | |
5060 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5061 | prepare_to_wait (ecs); |
5062 | return; | |
5063 | } | |
5064 | ||
65706a29 PA |
5065 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
5066 | { | |
65706a29 PA |
5067 | prepare_to_wait (ecs); |
5068 | return; | |
5069 | } | |
5070 | ||
0e5bf2a8 | 5071 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5072 | && handle_no_resumed (ecs)) |
5073 | return; | |
0e5bf2a8 | 5074 | |
5b6d1e4f PA |
5075 | /* Cache the last target/ptid/waitstatus. */ |
5076 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5077 | |
ca005067 | 5078 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5079 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5080 | |
0e5bf2a8 PA |
5081 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
5082 | { | |
5083 | /* No unwaited-for children left. IOW, all resumed children | |
5084 | have exited. */ | |
0e5bf2a8 | 5085 | stop_print_frame = 0; |
22bcd14b | 5086 | stop_waiting (ecs); |
0e5bf2a8 PA |
5087 | return; |
5088 | } | |
5089 | ||
8c90c137 | 5090 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 5091 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 | 5092 | { |
5b6d1e4f | 5093 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5094 | /* If it's a new thread, add it to the thread database. */ |
5095 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5096 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5097 | |
5098 | /* Disable range stepping. If the next step request could use a | |
5099 | range, this will be end up re-enabled then. */ | |
5100 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5101 | } |
88ed393a JK |
5102 | |
5103 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 5104 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
5105 | |
5106 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5107 | reinit_frame_cache (); | |
5108 | ||
28736962 PA |
5109 | breakpoint_retire_moribund (); |
5110 | ||
2b009048 DJ |
5111 | /* First, distinguish signals caused by the debugger from signals |
5112 | that have to do with the program's own actions. Note that | |
5113 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5114 | on the operating system version. Here we detect when a SIGILL or | |
5115 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5116 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5117 | when we're trying to execute a breakpoint instruction on a | |
5118 | non-executable stack. This happens for call dummy breakpoints | |
5119 | for architectures like SPARC that place call dummies on the | |
5120 | stack. */ | |
2b009048 | 5121 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
5122 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
5123 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
5124 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 5125 | { |
00431a78 | 5126 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5127 | |
a01bda52 | 5128 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5129 | regcache_read_pc (regcache))) |
5130 | { | |
4100594e | 5131 | infrun_log_debug ("Treating signal as SIGTRAP"); |
a493e3e2 | 5132 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 5133 | } |
2b009048 DJ |
5134 | } |
5135 | ||
293b3ebc | 5136 | mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws); |
8c90c137 | 5137 | |
488f131b JB |
5138 | switch (ecs->ws.kind) |
5139 | { | |
5140 | case TARGET_WAITKIND_LOADED: | |
00431a78 | 5141 | context_switch (ecs); |
b0f4b84b DJ |
5142 | /* Ignore gracefully during startup of the inferior, as it might |
5143 | be the shell which has just loaded some objects, otherwise | |
5144 | add the symbols for the newly loaded objects. Also ignore at | |
5145 | the beginning of an attach or remote session; we will query | |
5146 | the full list of libraries once the connection is | |
5147 | established. */ | |
4f5d7f63 | 5148 | |
00431a78 | 5149 | stop_soon = get_inferior_stop_soon (ecs); |
c0236d92 | 5150 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 5151 | { |
edcc5120 TT |
5152 | struct regcache *regcache; |
5153 | ||
00431a78 | 5154 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 TT |
5155 | |
5156 | handle_solib_event (); | |
5157 | ||
5158 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 5159 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
5160 | ecs->event_thread->suspend.stop_pc, |
5161 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 5162 | |
c65d6b55 PA |
5163 | if (handle_stop_requested (ecs)) |
5164 | return; | |
5165 | ||
ce12b012 | 5166 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
5167 | { |
5168 | /* A catchpoint triggered. */ | |
94c57d6a PA |
5169 | process_event_stop_test (ecs); |
5170 | return; | |
edcc5120 | 5171 | } |
488f131b | 5172 | |
b0f4b84b DJ |
5173 | /* If requested, stop when the dynamic linker notifies |
5174 | gdb of events. This allows the user to get control | |
5175 | and place breakpoints in initializer routines for | |
5176 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 5177 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
5178 | if (stop_on_solib_events) |
5179 | { | |
55409f9d DJ |
5180 | /* Make sure we print "Stopped due to solib-event" in |
5181 | normal_stop. */ | |
5182 | stop_print_frame = 1; | |
5183 | ||
22bcd14b | 5184 | stop_waiting (ecs); |
b0f4b84b DJ |
5185 | return; |
5186 | } | |
488f131b | 5187 | } |
b0f4b84b DJ |
5188 | |
5189 | /* If we are skipping through a shell, or through shared library | |
5190 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 5191 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
5192 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
5193 | { | |
74960c60 VP |
5194 | /* Loading of shared libraries might have changed breakpoint |
5195 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 5196 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 5197 | insert_breakpoints (); |
64ce06e4 | 5198 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
5199 | prepare_to_wait (ecs); |
5200 | return; | |
5201 | } | |
5202 | ||
5c09a2c5 PA |
5203 | /* But stop if we're attaching or setting up a remote |
5204 | connection. */ | |
5205 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5206 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5207 | { | |
4100594e | 5208 | infrun_log_debug ("quietly stopped"); |
22bcd14b | 5209 | stop_waiting (ecs); |
5c09a2c5 PA |
5210 | return; |
5211 | } | |
5212 | ||
5213 | internal_error (__FILE__, __LINE__, | |
5214 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 5215 | |
488f131b | 5216 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5217 | if (handle_stop_requested (ecs)) |
5218 | return; | |
00431a78 | 5219 | context_switch (ecs); |
64ce06e4 | 5220 | resume (GDB_SIGNAL_0); |
488f131b JB |
5221 | prepare_to_wait (ecs); |
5222 | return; | |
c5aa993b | 5223 | |
65706a29 | 5224 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5225 | if (handle_stop_requested (ecs)) |
5226 | return; | |
00431a78 | 5227 | context_switch (ecs); |
65706a29 PA |
5228 | if (!switch_back_to_stepped_thread (ecs)) |
5229 | keep_going (ecs); | |
5230 | return; | |
5231 | ||
488f131b | 5232 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5233 | case TARGET_WAITKIND_SIGNALLED: |
fb66883a | 5234 | inferior_ptid = ecs->ptid; |
5b6d1e4f | 5235 | set_current_inferior (find_inferior_ptid (ecs->target, ecs->ptid)); |
6c95b8df PA |
5236 | set_current_program_space (current_inferior ()->pspace); |
5237 | handle_vfork_child_exec_or_exit (0); | |
223ffa71 | 5238 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5239 | |
0c557179 SDJ |
5240 | /* Clearing any previous state of convenience variables. */ |
5241 | clear_exit_convenience_vars (); | |
5242 | ||
940c3c06 PA |
5243 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5244 | { | |
5245 | /* Record the exit code in the convenience variable $_exitcode, so | |
5246 | that the user can inspect this again later. */ | |
5247 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5248 | (LONGEST) ecs->ws.value.integer); | |
5249 | ||
5250 | /* Also record this in the inferior itself. */ | |
5251 | current_inferior ()->has_exit_code = 1; | |
5252 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5253 | |
98eb56a4 PA |
5254 | /* Support the --return-child-result option. */ |
5255 | return_child_result_value = ecs->ws.value.integer; | |
5256 | ||
76727919 | 5257 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
5258 | } |
5259 | else | |
0c557179 | 5260 | { |
00431a78 | 5261 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5262 | |
5263 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5264 | { | |
5265 | /* Set the value of the internal variable $_exitsignal, | |
5266 | which holds the signal uncaught by the inferior. */ | |
5267 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5268 | gdbarch_gdb_signal_to_target (gdbarch, | |
5269 | ecs->ws.value.sig)); | |
5270 | } | |
5271 | else | |
5272 | { | |
5273 | /* We don't have access to the target's method used for | |
5274 | converting between signal numbers (GDB's internal | |
5275 | representation <-> target's representation). | |
5276 | Therefore, we cannot do a good job at displaying this | |
5277 | information to the user. It's better to just warn | |
5278 | her about it (if infrun debugging is enabled), and | |
5279 | give up. */ | |
4100594e SM |
5280 | infrun_log_debug ("Cannot fill $_exitsignal with the correct " |
5281 | "signal number."); | |
0c557179 SDJ |
5282 | } |
5283 | ||
76727919 | 5284 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 5285 | } |
8cf64490 | 5286 | |
488f131b | 5287 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5288 | target_mourn_inferior (inferior_ptid); |
488f131b | 5289 | stop_print_frame = 0; |
22bcd14b | 5290 | stop_waiting (ecs); |
488f131b | 5291 | return; |
c5aa993b | 5292 | |
488f131b | 5293 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5294 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5295 | /* Check whether the inferior is displaced stepping. */ |
5296 | { | |
00431a78 | 5297 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5298 | struct gdbarch *gdbarch = regcache->arch (); |
e2d96639 YQ |
5299 | |
5300 | /* If checking displaced stepping is supported, and thread | |
5301 | ecs->ptid is displaced stepping. */ | |
00431a78 | 5302 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 YQ |
5303 | { |
5304 | struct inferior *parent_inf | |
5b6d1e4f | 5305 | = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 YQ |
5306 | struct regcache *child_regcache; |
5307 | CORE_ADDR parent_pc; | |
5308 | ||
d8d83535 SM |
5309 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) |
5310 | { | |
5311 | struct displaced_step_inferior_state *displaced | |
5312 | = get_displaced_stepping_state (parent_inf); | |
5313 | ||
5314 | /* Restore scratch pad for child process. */ | |
5315 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
5316 | } | |
5317 | ||
e2d96639 YQ |
5318 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, |
5319 | indicating that the displaced stepping of syscall instruction | |
5320 | has been done. Perform cleanup for parent process here. Note | |
5321 | that this operation also cleans up the child process for vfork, | |
5322 | because their pages are shared. */ | |
00431a78 | 5323 | displaced_step_fixup (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5324 | /* Start a new step-over in another thread if there's one |
5325 | that needs it. */ | |
5326 | start_step_over (); | |
e2d96639 | 5327 | |
e2d96639 YQ |
5328 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5329 | the child's PC is also within the scratchpad. Set the child's PC | |
5330 | to the parent's PC value, which has already been fixed up. | |
5331 | FIXME: we use the parent's aspace here, although we're touching | |
5332 | the child, because the child hasn't been added to the inferior | |
5333 | list yet at this point. */ | |
5334 | ||
5335 | child_regcache | |
5b6d1e4f PA |
5336 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
5337 | ecs->ws.value.related_pid, | |
e2d96639 YQ |
5338 | gdbarch, |
5339 | parent_inf->aspace); | |
5340 | /* Read PC value of parent process. */ | |
5341 | parent_pc = regcache_read_pc (regcache); | |
5342 | ||
5343 | if (debug_displaced) | |
5344 | fprintf_unfiltered (gdb_stdlog, | |
5345 | "displaced: write child pc from %s to %s\n", | |
5346 | paddress (gdbarch, | |
5347 | regcache_read_pc (child_regcache)), | |
5348 | paddress (gdbarch, parent_pc)); | |
5349 | ||
5350 | regcache_write_pc (child_regcache, parent_pc); | |
5351 | } | |
5352 | } | |
5353 | ||
00431a78 | 5354 | context_switch (ecs); |
5a2901d9 | 5355 | |
b242c3c2 PA |
5356 | /* Immediately detach breakpoints from the child before there's |
5357 | any chance of letting the user delete breakpoints from the | |
5358 | breakpoint lists. If we don't do this early, it's easy to | |
5359 | leave left over traps in the child, vis: "break foo; catch | |
5360 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5361 | the fork on the last `continue', and by that time the | |
5362 | breakpoint at "foo" is long gone from the breakpoint table. | |
5363 | If we vforked, then we don't need to unpatch here, since both | |
5364 | parent and child are sharing the same memory pages; we'll | |
5365 | need to unpatch at follow/detach time instead to be certain | |
5366 | that new breakpoints added between catchpoint hit time and | |
5367 | vfork follow are detached. */ | |
5368 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5369 | { | |
b242c3c2 PA |
5370 | /* This won't actually modify the breakpoint list, but will |
5371 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5372 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5373 | } |
5374 | ||
34b7e8a6 | 5375 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5376 | |
e58b0e63 PA |
5377 | /* In case the event is caught by a catchpoint, remember that |
5378 | the event is to be followed at the next resume of the thread, | |
5379 | and not immediately. */ | |
5380 | ecs->event_thread->pending_follow = ecs->ws; | |
5381 | ||
f2ffa92b PA |
5382 | ecs->event_thread->suspend.stop_pc |
5383 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 5384 | |
16c381f0 | 5385 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5386 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5387 | ecs->event_thread->suspend.stop_pc, |
5388 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 5389 | |
c65d6b55 PA |
5390 | if (handle_stop_requested (ecs)) |
5391 | return; | |
5392 | ||
ce12b012 PA |
5393 | /* If no catchpoint triggered for this, then keep going. Note |
5394 | that we're interested in knowing the bpstat actually causes a | |
5395 | stop, not just if it may explain the signal. Software | |
5396 | watchpoints, for example, always appear in the bpstat. */ | |
5397 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5398 | { |
5ab2fbf1 | 5399 | bool follow_child |
3e43a32a | 5400 | = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 5401 | |
a493e3e2 | 5402 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 | 5403 | |
5b6d1e4f PA |
5404 | process_stratum_target *targ |
5405 | = ecs->event_thread->inf->process_target (); | |
5406 | ||
5ab2fbf1 | 5407 | bool should_resume = follow_fork (); |
e58b0e63 | 5408 | |
5b6d1e4f PA |
5409 | /* Note that one of these may be an invalid pointer, |
5410 | depending on detach_fork. */ | |
00431a78 | 5411 | thread_info *parent = ecs->event_thread; |
5b6d1e4f PA |
5412 | thread_info *child |
5413 | = find_thread_ptid (targ, ecs->ws.value.related_pid); | |
6c95b8df | 5414 | |
a2077e25 PA |
5415 | /* At this point, the parent is marked running, and the |
5416 | child is marked stopped. */ | |
5417 | ||
5418 | /* If not resuming the parent, mark it stopped. */ | |
5419 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5420 | parent->set_running (false); |
a2077e25 PA |
5421 | |
5422 | /* If resuming the child, mark it running. */ | |
5423 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5424 | child->set_running (true); |
a2077e25 | 5425 | |
6c95b8df | 5426 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5427 | if (!detach_fork && (non_stop |
5428 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5429 | { |
5430 | if (follow_child) | |
5431 | switch_to_thread (parent); | |
5432 | else | |
5433 | switch_to_thread (child); | |
5434 | ||
5435 | ecs->event_thread = inferior_thread (); | |
5436 | ecs->ptid = inferior_ptid; | |
5437 | keep_going (ecs); | |
5438 | } | |
5439 | ||
5440 | if (follow_child) | |
5441 | switch_to_thread (child); | |
5442 | else | |
5443 | switch_to_thread (parent); | |
5444 | ||
e58b0e63 PA |
5445 | ecs->event_thread = inferior_thread (); |
5446 | ecs->ptid = inferior_ptid; | |
5447 | ||
5448 | if (should_resume) | |
5449 | keep_going (ecs); | |
5450 | else | |
22bcd14b | 5451 | stop_waiting (ecs); |
04e68871 DJ |
5452 | return; |
5453 | } | |
94c57d6a PA |
5454 | process_event_stop_test (ecs); |
5455 | return; | |
488f131b | 5456 | |
6c95b8df PA |
5457 | case TARGET_WAITKIND_VFORK_DONE: |
5458 | /* Done with the shared memory region. Re-insert breakpoints in | |
5459 | the parent, and keep going. */ | |
5460 | ||
00431a78 | 5461 | context_switch (ecs); |
6c95b8df PA |
5462 | |
5463 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5464 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5465 | |
5466 | if (handle_stop_requested (ecs)) | |
5467 | return; | |
5468 | ||
6c95b8df PA |
5469 | /* This also takes care of reinserting breakpoints in the |
5470 | previously locked inferior. */ | |
5471 | keep_going (ecs); | |
5472 | return; | |
5473 | ||
488f131b | 5474 | case TARGET_WAITKIND_EXECD: |
488f131b | 5475 | |
cbd2b4e3 PA |
5476 | /* Note we can't read registers yet (the stop_pc), because we |
5477 | don't yet know the inferior's post-exec architecture. | |
5478 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5479 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5480 | |
6c95b8df PA |
5481 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5482 | handle_vfork_child_exec_or_exit (1); | |
5483 | ||
795e548f PA |
5484 | /* This causes the eventpoints and symbol table to be reset. |
5485 | Must do this now, before trying to determine whether to | |
5486 | stop. */ | |
71b43ef8 | 5487 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5488 | |
17d8546e DB |
5489 | /* In follow_exec we may have deleted the original thread and |
5490 | created a new one. Make sure that the event thread is the | |
5491 | execd thread for that case (this is a nop otherwise). */ | |
5492 | ecs->event_thread = inferior_thread (); | |
5493 | ||
f2ffa92b PA |
5494 | ecs->event_thread->suspend.stop_pc |
5495 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5496 | |
16c381f0 | 5497 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5498 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5499 | ecs->event_thread->suspend.stop_pc, |
5500 | ecs->event_thread, &ecs->ws); | |
795e548f | 5501 | |
71b43ef8 PA |
5502 | /* Note that this may be referenced from inside |
5503 | bpstat_stop_status above, through inferior_has_execd. */ | |
5504 | xfree (ecs->ws.value.execd_pathname); | |
5505 | ecs->ws.value.execd_pathname = NULL; | |
5506 | ||
c65d6b55 PA |
5507 | if (handle_stop_requested (ecs)) |
5508 | return; | |
5509 | ||
04e68871 | 5510 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5511 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5512 | { |
a493e3e2 | 5513 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5514 | keep_going (ecs); |
5515 | return; | |
5516 | } | |
94c57d6a PA |
5517 | process_event_stop_test (ecs); |
5518 | return; | |
488f131b | 5519 | |
b4dc5ffa MK |
5520 | /* Be careful not to try to gather much state about a thread |
5521 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5522 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5523 | /* Getting the current syscall number. */ |
94c57d6a PA |
5524 | if (handle_syscall_event (ecs) == 0) |
5525 | process_event_stop_test (ecs); | |
5526 | return; | |
c906108c | 5527 | |
488f131b JB |
5528 | /* Before examining the threads further, step this thread to |
5529 | get it entirely out of the syscall. (We get notice of the | |
5530 | event when the thread is just on the verge of exiting a | |
5531 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5532 | into user code.) */ |
488f131b | 5533 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5534 | if (handle_syscall_event (ecs) == 0) |
5535 | process_event_stop_test (ecs); | |
5536 | return; | |
c906108c | 5537 | |
488f131b | 5538 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5539 | handle_signal_stop (ecs); |
5540 | return; | |
c906108c | 5541 | |
b2175913 MS |
5542 | case TARGET_WAITKIND_NO_HISTORY: |
5543 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5544 | |
d1988021 | 5545 | /* Switch to the stopped thread. */ |
00431a78 | 5546 | context_switch (ecs); |
4100594e | 5547 | infrun_log_debug ("stopped"); |
d1988021 | 5548 | |
34b7e8a6 | 5549 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5550 | ecs->event_thread->suspend.stop_pc |
5551 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5552 | |
5553 | if (handle_stop_requested (ecs)) | |
5554 | return; | |
5555 | ||
76727919 | 5556 | gdb::observers::no_history.notify (); |
22bcd14b | 5557 | stop_waiting (ecs); |
b2175913 | 5558 | return; |
488f131b | 5559 | } |
4f5d7f63 PA |
5560 | } |
5561 | ||
372316f1 PA |
5562 | /* Restart threads back to what they were trying to do back when we |
5563 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5564 | ignored. */ | |
4d9d9d04 PA |
5565 | |
5566 | static void | |
372316f1 PA |
5567 | restart_threads (struct thread_info *event_thread) |
5568 | { | |
372316f1 PA |
5569 | /* In case the instruction just stepped spawned a new thread. */ |
5570 | update_thread_list (); | |
5571 | ||
08036331 | 5572 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5573 | { |
f3f8ece4 PA |
5574 | switch_to_thread_no_regs (tp); |
5575 | ||
372316f1 PA |
5576 | if (tp == event_thread) |
5577 | { | |
4100594e SM |
5578 | infrun_log_debug ("restart threads: [%s] is event thread", |
5579 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5580 | continue; |
5581 | } | |
5582 | ||
5583 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5584 | { | |
4100594e SM |
5585 | infrun_log_debug ("restart threads: [%s] not meant to be running", |
5586 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5587 | continue; |
5588 | } | |
5589 | ||
5590 | if (tp->resumed) | |
5591 | { | |
4100594e SM |
5592 | infrun_log_debug ("restart threads: [%s] resumed", |
5593 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5594 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
5595 | continue; | |
5596 | } | |
5597 | ||
5598 | if (thread_is_in_step_over_chain (tp)) | |
5599 | { | |
4100594e SM |
5600 | infrun_log_debug ("restart threads: [%s] needs step-over", |
5601 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5602 | gdb_assert (!tp->resumed); |
5603 | continue; | |
5604 | } | |
5605 | ||
5606 | ||
5607 | if (tp->suspend.waitstatus_pending_p) | |
5608 | { | |
4100594e SM |
5609 | infrun_log_debug ("restart threads: [%s] has pending status", |
5610 | target_pid_to_str (tp->ptid).c_str ()); | |
719546c4 | 5611 | tp->resumed = true; |
372316f1 PA |
5612 | continue; |
5613 | } | |
5614 | ||
c65d6b55 PA |
5615 | gdb_assert (!tp->stop_requested); |
5616 | ||
372316f1 PA |
5617 | /* If some thread needs to start a step-over at this point, it |
5618 | should still be in the step-over queue, and thus skipped | |
5619 | above. */ | |
5620 | if (thread_still_needs_step_over (tp)) | |
5621 | { | |
5622 | internal_error (__FILE__, __LINE__, | |
5623 | "thread [%s] needs a step-over, but not in " | |
5624 | "step-over queue\n", | |
a068643d | 5625 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5626 | } |
5627 | ||
5628 | if (currently_stepping (tp)) | |
5629 | { | |
4100594e SM |
5630 | infrun_log_debug ("restart threads: [%s] was stepping", |
5631 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5632 | keep_going_stepped_thread (tp); |
5633 | } | |
5634 | else | |
5635 | { | |
5636 | struct execution_control_state ecss; | |
5637 | struct execution_control_state *ecs = &ecss; | |
5638 | ||
4100594e SM |
5639 | infrun_log_debug ("restart threads: [%s] continuing", |
5640 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 5641 | reset_ecs (ecs, tp); |
00431a78 | 5642 | switch_to_thread (tp); |
372316f1 PA |
5643 | keep_going_pass_signal (ecs); |
5644 | } | |
5645 | } | |
5646 | } | |
5647 | ||
5648 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5649 | a pending waitstatus. */ | |
5650 | ||
5651 | static int | |
5652 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5653 | void *arg) | |
5654 | { | |
5655 | return (tp->resumed | |
5656 | && tp->suspend.waitstatus_pending_p); | |
5657 | } | |
5658 | ||
5659 | /* Called when we get an event that may finish an in-line or | |
5660 | out-of-line (displaced stepping) step-over started previously. | |
5661 | Return true if the event is processed and we should go back to the | |
5662 | event loop; false if the caller should continue processing the | |
5663 | event. */ | |
5664 | ||
5665 | static int | |
4d9d9d04 PA |
5666 | finish_step_over (struct execution_control_state *ecs) |
5667 | { | |
372316f1 PA |
5668 | int had_step_over_info; |
5669 | ||
00431a78 | 5670 | displaced_step_fixup (ecs->event_thread, |
4d9d9d04 PA |
5671 | ecs->event_thread->suspend.stop_signal); |
5672 | ||
372316f1 PA |
5673 | had_step_over_info = step_over_info_valid_p (); |
5674 | ||
5675 | if (had_step_over_info) | |
4d9d9d04 PA |
5676 | { |
5677 | /* If we're stepping over a breakpoint with all threads locked, | |
5678 | then only the thread that was stepped should be reporting | |
5679 | back an event. */ | |
5680 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5681 | ||
c65d6b55 | 5682 | clear_step_over_info (); |
4d9d9d04 PA |
5683 | } |
5684 | ||
fbea99ea | 5685 | if (!target_is_non_stop_p ()) |
372316f1 | 5686 | return 0; |
4d9d9d04 PA |
5687 | |
5688 | /* Start a new step-over in another thread if there's one that | |
5689 | needs it. */ | |
5690 | start_step_over (); | |
372316f1 PA |
5691 | |
5692 | /* If we were stepping over a breakpoint before, and haven't started | |
5693 | a new in-line step-over sequence, then restart all other threads | |
5694 | (except the event thread). We can't do this in all-stop, as then | |
5695 | e.g., we wouldn't be able to issue any other remote packet until | |
5696 | these other threads stop. */ | |
5697 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5698 | { | |
5699 | struct thread_info *pending; | |
5700 | ||
5701 | /* If we only have threads with pending statuses, the restart | |
5702 | below won't restart any thread and so nothing re-inserts the | |
5703 | breakpoint we just stepped over. But we need it inserted | |
5704 | when we later process the pending events, otherwise if | |
5705 | another thread has a pending event for this breakpoint too, | |
5706 | we'd discard its event (because the breakpoint that | |
5707 | originally caused the event was no longer inserted). */ | |
00431a78 | 5708 | context_switch (ecs); |
372316f1 PA |
5709 | insert_breakpoints (); |
5710 | ||
5711 | restart_threads (ecs->event_thread); | |
5712 | ||
5713 | /* If we have events pending, go through handle_inferior_event | |
5714 | again, picking up a pending event at random. This avoids | |
5715 | thread starvation. */ | |
5716 | ||
5717 | /* But not if we just stepped over a watchpoint in order to let | |
5718 | the instruction execute so we can evaluate its expression. | |
5719 | The set of watchpoints that triggered is recorded in the | |
5720 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5721 | If we processed another event first, that other event could | |
5722 | clobber this info. */ | |
5723 | if (ecs->event_thread->stepping_over_watchpoint) | |
5724 | return 0; | |
5725 | ||
5726 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5727 | NULL); | |
5728 | if (pending != NULL) | |
5729 | { | |
5730 | struct thread_info *tp = ecs->event_thread; | |
5731 | struct regcache *regcache; | |
5732 | ||
4100594e SM |
5733 | infrun_log_debug ("found resumed threads with " |
5734 | "pending events, saving status"); | |
372316f1 PA |
5735 | |
5736 | gdb_assert (pending != tp); | |
5737 | ||
5738 | /* Record the event thread's event for later. */ | |
5739 | save_waitstatus (tp, &ecs->ws); | |
5740 | /* This was cleared early, by handle_inferior_event. Set it | |
5741 | so this pending event is considered by | |
5742 | do_target_wait. */ | |
719546c4 | 5743 | tp->resumed = true; |
372316f1 PA |
5744 | |
5745 | gdb_assert (!tp->executing); | |
5746 | ||
00431a78 | 5747 | regcache = get_thread_regcache (tp); |
372316f1 PA |
5748 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
5749 | ||
4100594e SM |
5750 | infrun_log_debug ("saved stop_pc=%s for %s " |
5751 | "(currently_stepping=%d)\n", | |
5752 | paddress (target_gdbarch (), | |
5753 | tp->suspend.stop_pc), | |
5754 | target_pid_to_str (tp->ptid).c_str (), | |
5755 | currently_stepping (tp)); | |
372316f1 PA |
5756 | |
5757 | /* This in-line step-over finished; clear this so we won't | |
5758 | start a new one. This is what handle_signal_stop would | |
5759 | do, if we returned false. */ | |
5760 | tp->stepping_over_breakpoint = 0; | |
5761 | ||
5762 | /* Wake up the event loop again. */ | |
5763 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5764 | ||
5765 | prepare_to_wait (ecs); | |
5766 | return 1; | |
5767 | } | |
5768 | } | |
5769 | ||
5770 | return 0; | |
4d9d9d04 PA |
5771 | } |
5772 | ||
4f5d7f63 PA |
5773 | /* Come here when the program has stopped with a signal. */ |
5774 | ||
5775 | static void | |
5776 | handle_signal_stop (struct execution_control_state *ecs) | |
5777 | { | |
5778 | struct frame_info *frame; | |
5779 | struct gdbarch *gdbarch; | |
5780 | int stopped_by_watchpoint; | |
5781 | enum stop_kind stop_soon; | |
5782 | int random_signal; | |
c906108c | 5783 | |
f0407826 DE |
5784 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5785 | ||
c65d6b55 PA |
5786 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5787 | ||
f0407826 DE |
5788 | /* Do we need to clean up the state of a thread that has |
5789 | completed a displaced single-step? (Doing so usually affects | |
5790 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5791 | if (finish_step_over (ecs)) |
5792 | return; | |
f0407826 DE |
5793 | |
5794 | /* If we either finished a single-step or hit a breakpoint, but | |
5795 | the user wanted this thread to be stopped, pretend we got a | |
5796 | SIG0 (generic unsignaled stop). */ | |
5797 | if (ecs->event_thread->stop_requested | |
5798 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5799 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5800 | |
f2ffa92b PA |
5801 | ecs->event_thread->suspend.stop_pc |
5802 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 5803 | |
527159b7 | 5804 | if (debug_infrun) |
237fc4c9 | 5805 | { |
00431a78 | 5806 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 5807 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 5808 | |
f3f8ece4 | 5809 | switch_to_thread (ecs->event_thread); |
5af949e3 | 5810 | |
4100594e SM |
5811 | infrun_log_debug ("stop_pc=%s", |
5812 | paddress (reg_gdbarch, | |
5813 | ecs->event_thread->suspend.stop_pc)); | |
d92524f1 | 5814 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5815 | { |
5816 | CORE_ADDR addr; | |
abbb1732 | 5817 | |
4100594e | 5818 | infrun_log_debug ("stopped by watchpoint"); |
237fc4c9 | 5819 | |
8b88a78e | 5820 | if (target_stopped_data_address (current_top_target (), &addr)) |
4100594e SM |
5821 | infrun_log_debug ("stopped data address=%s", |
5822 | paddress (reg_gdbarch, addr)); | |
237fc4c9 | 5823 | else |
4100594e | 5824 | infrun_log_debug ("(no data address available)"); |
237fc4c9 PA |
5825 | } |
5826 | } | |
527159b7 | 5827 | |
36fa8042 PA |
5828 | /* This is originated from start_remote(), start_inferior() and |
5829 | shared libraries hook functions. */ | |
00431a78 | 5830 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
5831 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
5832 | { | |
00431a78 | 5833 | context_switch (ecs); |
4100594e | 5834 | infrun_log_debug ("quietly stopped"); |
36fa8042 | 5835 | stop_print_frame = 1; |
22bcd14b | 5836 | stop_waiting (ecs); |
36fa8042 PA |
5837 | return; |
5838 | } | |
5839 | ||
36fa8042 PA |
5840 | /* This originates from attach_command(). We need to overwrite |
5841 | the stop_signal here, because some kernels don't ignore a | |
5842 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5843 | See more comments in inferior.h. On the other hand, if we | |
5844 | get a non-SIGSTOP, report it to the user - assume the backend | |
5845 | will handle the SIGSTOP if it should show up later. | |
5846 | ||
5847 | Also consider that the attach is complete when we see a | |
5848 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5849 | target extended-remote report it instead of a SIGSTOP | |
5850 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5851 | signal, so this is no exception. | |
5852 | ||
5853 | Also consider that the attach is complete when we see a | |
5854 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5855 | the target to stop all threads of the inferior, in case the | |
5856 | low level attach operation doesn't stop them implicitly. If | |
5857 | they weren't stopped implicitly, then the stub will report a | |
5858 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5859 | other than GDB's request. */ | |
5860 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5861 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5862 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5863 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5864 | { | |
5865 | stop_print_frame = 1; | |
22bcd14b | 5866 | stop_waiting (ecs); |
36fa8042 PA |
5867 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5868 | return; | |
5869 | } | |
5870 | ||
488f131b | 5871 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 | 5872 | so, then switch to that thread. */ |
d7e15655 | 5873 | if (ecs->ptid != inferior_ptid) |
488f131b | 5874 | { |
4100594e | 5875 | infrun_log_debug ("context switch"); |
527159b7 | 5876 | |
00431a78 | 5877 | context_switch (ecs); |
c5aa993b | 5878 | |
9a4105ab | 5879 | if (deprecated_context_hook) |
00431a78 | 5880 | deprecated_context_hook (ecs->event_thread->global_num); |
488f131b | 5881 | } |
c906108c | 5882 | |
568d6575 UW |
5883 | /* At this point, get hold of the now-current thread's frame. */ |
5884 | frame = get_current_frame (); | |
5885 | gdbarch = get_frame_arch (frame); | |
5886 | ||
2adfaa28 | 5887 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5888 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5889 | { |
af48d08f | 5890 | struct regcache *regcache; |
af48d08f | 5891 | CORE_ADDR pc; |
2adfaa28 | 5892 | |
00431a78 | 5893 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
5894 | const address_space *aspace = regcache->aspace (); |
5895 | ||
af48d08f | 5896 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 5897 | |
af48d08f PA |
5898 | /* However, before doing so, if this single-step breakpoint was |
5899 | actually for another thread, set this thread up for moving | |
5900 | past it. */ | |
5901 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5902 | aspace, pc)) | |
5903 | { | |
5904 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 | 5905 | { |
4100594e SM |
5906 | infrun_log_debug ("[%s] hit another thread's single-step " |
5907 | "breakpoint", | |
5908 | target_pid_to_str (ecs->ptid).c_str ()); | |
af48d08f PA |
5909 | ecs->hit_singlestep_breakpoint = 1; |
5910 | } | |
5911 | } | |
5912 | else | |
5913 | { | |
4100594e SM |
5914 | infrun_log_debug ("[%s] hit its single-step breakpoint", |
5915 | target_pid_to_str (ecs->ptid).c_str ()); | |
2adfaa28 | 5916 | } |
488f131b | 5917 | } |
af48d08f | 5918 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5919 | |
963f9c80 PA |
5920 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5921 | && ecs->event_thread->control.trap_expected | |
5922 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5923 | stopped_by_watchpoint = 0; |
5924 | else | |
5925 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5926 | ||
5927 | /* If necessary, step over this watchpoint. We'll be back to display | |
5928 | it in a moment. */ | |
5929 | if (stopped_by_watchpoint | |
d92524f1 | 5930 | && (target_have_steppable_watchpoint |
568d6575 | 5931 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5932 | { |
488f131b JB |
5933 | /* At this point, we are stopped at an instruction which has |
5934 | attempted to write to a piece of memory under control of | |
5935 | a watchpoint. The instruction hasn't actually executed | |
5936 | yet. If we were to evaluate the watchpoint expression | |
5937 | now, we would get the old value, and therefore no change | |
5938 | would seem to have occurred. | |
5939 | ||
5940 | In order to make watchpoints work `right', we really need | |
5941 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5942 | watchpoint expression. We do this by single-stepping the |
5943 | target. | |
5944 | ||
7f89fd65 | 5945 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5946 | it. For example, the PA can (with some kernel cooperation) |
5947 | single step over a watchpoint without disabling the watchpoint. | |
5948 | ||
5949 | It is far more common to need to disable a watchpoint to step | |
5950 | the inferior over it. If we have non-steppable watchpoints, | |
5951 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5952 | disable all watchpoints. |
5953 | ||
5954 | Any breakpoint at PC must also be stepped over -- if there's | |
5955 | one, it will have already triggered before the watchpoint | |
5956 | triggered, and we either already reported it to the user, or | |
5957 | it didn't cause a stop and we called keep_going. In either | |
5958 | case, if there was a breakpoint at PC, we must be trying to | |
5959 | step past it. */ | |
5960 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5961 | keep_going (ecs); | |
488f131b JB |
5962 | return; |
5963 | } | |
5964 | ||
4e1c45ea | 5965 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5966 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5967 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5968 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5969 | stop_print_frame = 1; |
488f131b | 5970 | stopped_by_random_signal = 0; |
ddfe970e | 5971 | bpstat stop_chain = NULL; |
488f131b | 5972 | |
edb3359d DJ |
5973 | /* Hide inlined functions starting here, unless we just performed stepi or |
5974 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5975 | inline function call sites). */ | |
16c381f0 | 5976 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 5977 | { |
00431a78 PA |
5978 | const address_space *aspace |
5979 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
5980 | |
5981 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5982 | determine that the address is one where functions cannot have | |
5983 | been inlined. This improves performance with inferiors that | |
5984 | load a lot of shared libraries, because the solib event | |
5985 | breakpoint is defined as the address of a function (i.e. not | |
5986 | inline). Note that we have to check the previous PC as well | |
5987 | as the current one to catch cases when we have just | |
5988 | single-stepped off a breakpoint prior to reinstating it. | |
5989 | Note that we're assuming that the code we single-step to is | |
5990 | not inline, but that's not definitive: there's nothing | |
5991 | preventing the event breakpoint function from containing | |
5992 | inlined code, and the single-step ending up there. If the | |
5993 | user had set a breakpoint on that inlined code, the missing | |
5994 | skip_inline_frames call would break things. Fortunately | |
5995 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
5996 | if (!pc_at_non_inline_function (aspace, |
5997 | ecs->event_thread->suspend.stop_pc, | |
5998 | &ecs->ws) | |
a210c238 MR |
5999 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
6000 | && ecs->event_thread->control.trap_expected | |
6001 | && pc_at_non_inline_function (aspace, | |
6002 | ecs->event_thread->prev_pc, | |
09ac7c10 | 6003 | &ecs->ws))) |
1c5a993e | 6004 | { |
f2ffa92b PA |
6005 | stop_chain = build_bpstat_chain (aspace, |
6006 | ecs->event_thread->suspend.stop_pc, | |
6007 | &ecs->ws); | |
00431a78 | 6008 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
6009 | |
6010 | /* Re-fetch current thread's frame in case that invalidated | |
6011 | the frame cache. */ | |
6012 | frame = get_current_frame (); | |
6013 | gdbarch = get_frame_arch (frame); | |
6014 | } | |
0574c78f | 6015 | } |
edb3359d | 6016 | |
a493e3e2 | 6017 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 6018 | && ecs->event_thread->control.trap_expected |
568d6575 | 6019 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6020 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6021 | { |
b50d7442 | 6022 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6023 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6024 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6025 | with a delay slot. It needs to be stepped twice, once for |
6026 | the instruction and once for the delay slot. */ | |
6027 | int step_through_delay | |
568d6575 | 6028 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6029 | |
4100594e SM |
6030 | if (step_through_delay) |
6031 | infrun_log_debug ("step through delay"); | |
6032 | ||
16c381f0 JK |
6033 | if (ecs->event_thread->control.step_range_end == 0 |
6034 | && step_through_delay) | |
3352ef37 AC |
6035 | { |
6036 | /* The user issued a continue when stopped at a breakpoint. | |
6037 | Set up for another trap and get out of here. */ | |
4e1c45ea | 6038 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6039 | keep_going (ecs); |
6040 | return; | |
6041 | } | |
6042 | else if (step_through_delay) | |
6043 | { | |
6044 | /* The user issued a step when stopped at a breakpoint. | |
6045 | Maybe we should stop, maybe we should not - the delay | |
6046 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6047 | case, don't decide that here, just set |
6048 | ecs->stepping_over_breakpoint, making sure we | |
6049 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6050 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6051 | } |
6052 | } | |
6053 | ||
ab04a2af TT |
6054 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6055 | handles this event. */ | |
6056 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6057 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
6058 | ecs->event_thread->suspend.stop_pc, |
6059 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 6060 | |
ab04a2af TT |
6061 | /* Following in case break condition called a |
6062 | function. */ | |
6063 | stop_print_frame = 1; | |
73dd234f | 6064 | |
ab04a2af TT |
6065 | /* This is where we handle "moribund" watchpoints. Unlike |
6066 | software breakpoints traps, hardware watchpoint traps are | |
6067 | always distinguishable from random traps. If no high-level | |
6068 | watchpoint is associated with the reported stop data address | |
6069 | anymore, then the bpstat does not explain the signal --- | |
6070 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6071 | set. */ | |
6072 | ||
4100594e | 6073 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
47591c29 | 6074 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6075 | GDB_SIGNAL_TRAP) |
ab04a2af | 6076 | && stopped_by_watchpoint) |
4100594e SM |
6077 | { |
6078 | infrun_log_debug ("no user watchpoint explains watchpoint SIGTRAP, " | |
6079 | "ignoring"); | |
6080 | } | |
73dd234f | 6081 | |
bac7d97b | 6082 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6083 | at one stage in the past included checks for an inferior |
6084 | function call's call dummy's return breakpoint. The original | |
6085 | comment, that went with the test, read: | |
03cebad2 | 6086 | |
ab04a2af TT |
6087 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6088 | another signal besides SIGTRAP, so check here as well as | |
6089 | above.'' | |
73dd234f | 6090 | |
ab04a2af TT |
6091 | If someone ever tries to get call dummys on a |
6092 | non-executable stack to work (where the target would stop | |
6093 | with something like a SIGSEGV), then those tests might need | |
6094 | to be re-instated. Given, however, that the tests were only | |
6095 | enabled when momentary breakpoints were not being used, I | |
6096 | suspect that it won't be the case. | |
488f131b | 6097 | |
ab04a2af TT |
6098 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6099 | be necessary for call dummies on a non-executable stack on | |
6100 | SPARC. */ | |
488f131b | 6101 | |
bac7d97b | 6102 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6103 | random_signal |
6104 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
6105 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 6106 | |
1cf4d951 PA |
6107 | /* Maybe this was a trap for a software breakpoint that has since |
6108 | been removed. */ | |
6109 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6110 | { | |
5133a315 LM |
6111 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
6112 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
6113 | { |
6114 | struct regcache *regcache; | |
6115 | int decr_pc; | |
6116 | ||
6117 | /* Re-adjust PC to what the program would see if GDB was not | |
6118 | debugging it. */ | |
00431a78 | 6119 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6120 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6121 | if (decr_pc != 0) |
6122 | { | |
07036511 TT |
6123 | gdb::optional<scoped_restore_tmpl<int>> |
6124 | restore_operation_disable; | |
1cf4d951 PA |
6125 | |
6126 | if (record_full_is_used ()) | |
07036511 TT |
6127 | restore_operation_disable.emplace |
6128 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6129 | |
f2ffa92b PA |
6130 | regcache_write_pc (regcache, |
6131 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
6132 | } |
6133 | } | |
6134 | else | |
6135 | { | |
6136 | /* A delayed software breakpoint event. Ignore the trap. */ | |
4100594e | 6137 | infrun_log_debug ("delayed software breakpoint trap, ignoring"); |
1cf4d951 PA |
6138 | random_signal = 0; |
6139 | } | |
6140 | } | |
6141 | ||
6142 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6143 | has since been removed. */ | |
6144 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6145 | { | |
6146 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
4100594e SM |
6147 | infrun_log_debug ("delayed hardware breakpoint/watchpoint " |
6148 | "trap, ignoring"); | |
1cf4d951 PA |
6149 | random_signal = 0; |
6150 | } | |
6151 | ||
bac7d97b PA |
6152 | /* If not, perhaps stepping/nexting can. */ |
6153 | if (random_signal) | |
6154 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6155 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6156 | |
2adfaa28 PA |
6157 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6158 | thread. Single-step breakpoints are transparent to the | |
6159 | breakpoints module. */ | |
6160 | if (random_signal) | |
6161 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6162 | ||
bac7d97b PA |
6163 | /* No? Perhaps we got a moribund watchpoint. */ |
6164 | if (random_signal) | |
6165 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6166 | |
c65d6b55 PA |
6167 | /* Always stop if the user explicitly requested this thread to |
6168 | remain stopped. */ | |
6169 | if (ecs->event_thread->stop_requested) | |
6170 | { | |
6171 | random_signal = 1; | |
4100594e | 6172 | infrun_log_debug ("user-requested stop"); |
c65d6b55 PA |
6173 | } |
6174 | ||
488f131b JB |
6175 | /* For the program's own signals, act according to |
6176 | the signal handling tables. */ | |
6177 | ||
ce12b012 | 6178 | if (random_signal) |
488f131b JB |
6179 | { |
6180 | /* Signal not for debugging purposes. */ | |
5b6d1e4f | 6181 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
c9737c08 | 6182 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6183 | |
4100594e SM |
6184 | infrun_log_debug ("random signal (%s)", |
6185 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6186 | |
488f131b JB |
6187 | stopped_by_random_signal = 1; |
6188 | ||
252fbfc8 PA |
6189 | /* Always stop on signals if we're either just gaining control |
6190 | of the program, or the user explicitly requested this thread | |
6191 | to remain stopped. */ | |
d6b48e9c | 6192 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6193 | || ecs->event_thread->stop_requested |
24291992 | 6194 | || (!inf->detaching |
16c381f0 | 6195 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 6196 | { |
22bcd14b | 6197 | stop_waiting (ecs); |
488f131b JB |
6198 | return; |
6199 | } | |
b57bacec PA |
6200 | |
6201 | /* Notify observers the signal has "handle print" set. Note we | |
6202 | returned early above if stopping; normal_stop handles the | |
6203 | printing in that case. */ | |
6204 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6205 | { | |
6206 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6207 | target_terminal::ours_for_output (); |
76727919 | 6208 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 6209 | target_terminal::inferior (); |
b57bacec | 6210 | } |
488f131b JB |
6211 | |
6212 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6213 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6214 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6215 | |
f2ffa92b | 6216 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 6217 | && ecs->event_thread->control.trap_expected |
8358c15c | 6218 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6219 | { |
6220 | /* We were just starting a new sequence, attempting to | |
6221 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6222 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6223 | of the stepping range so GDB needs to remember to, when |
6224 | the signal handler returns, resume stepping off that | |
6225 | breakpoint. */ | |
6226 | /* To simplify things, "continue" is forced to use the same | |
6227 | code paths as single-step - set a breakpoint at the | |
6228 | signal return address and then, once hit, step off that | |
6229 | breakpoint. */ | |
4100594e | 6230 | infrun_log_debug ("signal arrived while stepping over breakpoint"); |
d3169d93 | 6231 | |
2c03e5be | 6232 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6233 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6234 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6235 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6236 | |
6237 | /* If we were nexting/stepping some other thread, switch to | |
6238 | it, so that we don't continue it, losing control. */ | |
6239 | if (!switch_back_to_stepped_thread (ecs)) | |
6240 | keep_going (ecs); | |
9d799f85 | 6241 | return; |
68f53502 | 6242 | } |
9d799f85 | 6243 | |
e5f8a7cc | 6244 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
6245 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6246 | ecs->event_thread) | |
e5f8a7cc | 6247 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 6248 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6249 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6250 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6251 | { |
6252 | /* The inferior is about to take a signal that will take it | |
6253 | out of the single step range. Set a breakpoint at the | |
6254 | current PC (which is presumably where the signal handler | |
6255 | will eventually return) and then allow the inferior to | |
6256 | run free. | |
6257 | ||
6258 | Note that this is only needed for a signal delivered | |
6259 | while in the single-step range. Nested signals aren't a | |
6260 | problem as they eventually all return. */ | |
4100594e | 6261 | infrun_log_debug ("signal may take us out of single-step range"); |
237fc4c9 | 6262 | |
372316f1 | 6263 | clear_step_over_info (); |
2c03e5be | 6264 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6265 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6266 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6267 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6268 | keep_going (ecs); |
6269 | return; | |
d303a6c7 | 6270 | } |
9d799f85 | 6271 | |
85102364 | 6272 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6273 | when either there's a nested signal, or when there's a |
6274 | pending signal enabled just as the signal handler returns | |
6275 | (leaving the inferior at the step-resume-breakpoint without | |
6276 | actually executing it). Either way continue until the | |
6277 | breakpoint is really hit. */ | |
c447ac0b PA |
6278 | |
6279 | if (!switch_back_to_stepped_thread (ecs)) | |
6280 | { | |
4100594e | 6281 | infrun_log_debug ("random signal, keep going"); |
c447ac0b PA |
6282 | |
6283 | keep_going (ecs); | |
6284 | } | |
6285 | return; | |
488f131b | 6286 | } |
94c57d6a PA |
6287 | |
6288 | process_event_stop_test (ecs); | |
6289 | } | |
6290 | ||
6291 | /* Come here when we've got some debug event / signal we can explain | |
6292 | (IOW, not a random signal), and test whether it should cause a | |
6293 | stop, or whether we should resume the inferior (transparently). | |
6294 | E.g., could be a breakpoint whose condition evaluates false; we | |
6295 | could be still stepping within the line; etc. */ | |
6296 | ||
6297 | static void | |
6298 | process_event_stop_test (struct execution_control_state *ecs) | |
6299 | { | |
6300 | struct symtab_and_line stop_pc_sal; | |
6301 | struct frame_info *frame; | |
6302 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6303 | CORE_ADDR jmp_buf_pc; |
6304 | struct bpstat_what what; | |
94c57d6a | 6305 | |
cdaa5b73 | 6306 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6307 | |
cdaa5b73 PA |
6308 | frame = get_current_frame (); |
6309 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6310 | |
cdaa5b73 | 6311 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6312 | |
cdaa5b73 PA |
6313 | if (what.call_dummy) |
6314 | { | |
6315 | stop_stack_dummy = what.call_dummy; | |
6316 | } | |
186c406b | 6317 | |
243a9253 PA |
6318 | /* A few breakpoint types have callbacks associated (e.g., |
6319 | bp_jit_event). Run them now. */ | |
6320 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6321 | ||
cdaa5b73 PA |
6322 | /* If we hit an internal event that triggers symbol changes, the |
6323 | current frame will be invalidated within bpstat_what (e.g., if we | |
6324 | hit an internal solib event). Re-fetch it. */ | |
6325 | frame = get_current_frame (); | |
6326 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6327 | |
cdaa5b73 PA |
6328 | switch (what.main_action) |
6329 | { | |
6330 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6331 | /* If we hit the breakpoint at longjmp while stepping, we | |
6332 | install a momentary breakpoint at the target of the | |
6333 | jmp_buf. */ | |
186c406b | 6334 | |
4100594e | 6335 | infrun_log_debug ("BPSTAT_WHAT_SET_LONGJMP_RESUME"); |
186c406b | 6336 | |
cdaa5b73 | 6337 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6338 | |
cdaa5b73 PA |
6339 | if (what.is_longjmp) |
6340 | { | |
6341 | struct value *arg_value; | |
6342 | ||
6343 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6344 | then use it to extract the arguments. The destination PC | |
6345 | is the third argument to the probe. */ | |
6346 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6347 | if (arg_value) | |
8fa0c4f8 AA |
6348 | { |
6349 | jmp_buf_pc = value_as_address (arg_value); | |
6350 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6351 | } | |
cdaa5b73 PA |
6352 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6353 | || !gdbarch_get_longjmp_target (gdbarch, | |
6354 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6355 | { |
4100594e SM |
6356 | infrun_log_debug ("BPSTAT_WHAT_SET_LONGJMP_RESUME " |
6357 | "(!gdbarch_get_longjmp_target)"); | |
cdaa5b73 PA |
6358 | keep_going (ecs); |
6359 | return; | |
e2e4d78b | 6360 | } |
e2e4d78b | 6361 | |
cdaa5b73 PA |
6362 | /* Insert a breakpoint at resume address. */ |
6363 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6364 | } | |
6365 | else | |
6366 | check_exception_resume (ecs, frame); | |
6367 | keep_going (ecs); | |
6368 | return; | |
e81a37f7 | 6369 | |
cdaa5b73 PA |
6370 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6371 | { | |
6372 | struct frame_info *init_frame; | |
e81a37f7 | 6373 | |
cdaa5b73 | 6374 | /* There are several cases to consider. |
c906108c | 6375 | |
cdaa5b73 PA |
6376 | 1. The initiating frame no longer exists. In this case we |
6377 | must stop, because the exception or longjmp has gone too | |
6378 | far. | |
2c03e5be | 6379 | |
cdaa5b73 PA |
6380 | 2. The initiating frame exists, and is the same as the |
6381 | current frame. We stop, because the exception or longjmp | |
6382 | has been caught. | |
2c03e5be | 6383 | |
cdaa5b73 PA |
6384 | 3. The initiating frame exists and is different from the |
6385 | current frame. This means the exception or longjmp has | |
6386 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6387 | |
cdaa5b73 PA |
6388 | 4. longjmp breakpoint has been placed just to protect |
6389 | against stale dummy frames and user is not interested in | |
6390 | stopping around longjmps. */ | |
c5aa993b | 6391 | |
4100594e | 6392 | infrun_log_debug ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME"); |
c5aa993b | 6393 | |
cdaa5b73 PA |
6394 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6395 | != NULL); | |
6396 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6397 | |
cdaa5b73 PA |
6398 | if (what.is_longjmp) |
6399 | { | |
b67a2c6f | 6400 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6401 | |
cdaa5b73 | 6402 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6403 | { |
cdaa5b73 PA |
6404 | /* Case 4. */ |
6405 | keep_going (ecs); | |
6406 | return; | |
e5ef252a | 6407 | } |
cdaa5b73 | 6408 | } |
c5aa993b | 6409 | |
cdaa5b73 | 6410 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6411 | |
cdaa5b73 PA |
6412 | if (init_frame) |
6413 | { | |
6414 | struct frame_id current_id | |
6415 | = get_frame_id (get_current_frame ()); | |
6416 | if (frame_id_eq (current_id, | |
6417 | ecs->event_thread->initiating_frame)) | |
6418 | { | |
6419 | /* Case 2. Fall through. */ | |
6420 | } | |
6421 | else | |
6422 | { | |
6423 | /* Case 3. */ | |
6424 | keep_going (ecs); | |
6425 | return; | |
6426 | } | |
68f53502 | 6427 | } |
488f131b | 6428 | |
cdaa5b73 PA |
6429 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6430 | exists. */ | |
6431 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6432 | |
bdc36728 | 6433 | end_stepping_range (ecs); |
cdaa5b73 PA |
6434 | } |
6435 | return; | |
e5ef252a | 6436 | |
cdaa5b73 | 6437 | case BPSTAT_WHAT_SINGLE: |
4100594e | 6438 | infrun_log_debug ("BPSTAT_WHAT_SINGLE"); |
cdaa5b73 PA |
6439 | ecs->event_thread->stepping_over_breakpoint = 1; |
6440 | /* Still need to check other stuff, at least the case where we | |
6441 | are stepping and step out of the right range. */ | |
6442 | break; | |
e5ef252a | 6443 | |
cdaa5b73 | 6444 | case BPSTAT_WHAT_STEP_RESUME: |
4100594e | 6445 | infrun_log_debug ("BPSTAT_WHAT_STEP_RESUME"); |
e5ef252a | 6446 | |
cdaa5b73 PA |
6447 | delete_step_resume_breakpoint (ecs->event_thread); |
6448 | if (ecs->event_thread->control.proceed_to_finish | |
6449 | && execution_direction == EXEC_REVERSE) | |
6450 | { | |
6451 | struct thread_info *tp = ecs->event_thread; | |
6452 | ||
6453 | /* We are finishing a function in reverse, and just hit the | |
6454 | step-resume breakpoint at the start address of the | |
6455 | function, and we're almost there -- just need to back up | |
6456 | by one more single-step, which should take us back to the | |
6457 | function call. */ | |
6458 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6459 | keep_going (ecs); | |
e5ef252a | 6460 | return; |
cdaa5b73 PA |
6461 | } |
6462 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6463 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6464 | && execution_direction == EXEC_REVERSE) |
6465 | { | |
6466 | /* We are stepping over a function call in reverse, and just | |
6467 | hit the step-resume breakpoint at the start address of | |
6468 | the function. Go back to single-stepping, which should | |
6469 | take us back to the function call. */ | |
6470 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6471 | keep_going (ecs); | |
6472 | return; | |
6473 | } | |
6474 | break; | |
e5ef252a | 6475 | |
cdaa5b73 | 6476 | case BPSTAT_WHAT_STOP_NOISY: |
4100594e | 6477 | infrun_log_debug ("BPSTAT_WHAT_STOP_NOISY"); |
cdaa5b73 | 6478 | stop_print_frame = 1; |
e5ef252a | 6479 | |
99619bea PA |
6480 | /* Assume the thread stopped for a breapoint. We'll still check |
6481 | whether a/the breakpoint is there when the thread is next | |
6482 | resumed. */ | |
6483 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6484 | |
22bcd14b | 6485 | stop_waiting (ecs); |
cdaa5b73 | 6486 | return; |
e5ef252a | 6487 | |
cdaa5b73 | 6488 | case BPSTAT_WHAT_STOP_SILENT: |
4100594e | 6489 | infrun_log_debug ("BPSTAT_WHAT_STOP_SILENT"); |
cdaa5b73 | 6490 | stop_print_frame = 0; |
e5ef252a | 6491 | |
99619bea PA |
6492 | /* Assume the thread stopped for a breapoint. We'll still check |
6493 | whether a/the breakpoint is there when the thread is next | |
6494 | resumed. */ | |
6495 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6496 | stop_waiting (ecs); |
cdaa5b73 PA |
6497 | return; |
6498 | ||
6499 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
4100594e | 6500 | infrun_log_debug ("BPSTAT_WHAT_HP_STEP_RESUME"); |
cdaa5b73 PA |
6501 | |
6502 | delete_step_resume_breakpoint (ecs->event_thread); | |
6503 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6504 | { | |
6505 | /* Back when the step-resume breakpoint was inserted, we | |
6506 | were trying to single-step off a breakpoint. Go back to | |
6507 | doing that. */ | |
6508 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6509 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6510 | keep_going (ecs); | |
6511 | return; | |
e5ef252a | 6512 | } |
cdaa5b73 PA |
6513 | break; |
6514 | ||
6515 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6516 | break; | |
e5ef252a | 6517 | } |
c906108c | 6518 | |
af48d08f PA |
6519 | /* If we stepped a permanent breakpoint and we had a high priority |
6520 | step-resume breakpoint for the address we stepped, but we didn't | |
6521 | hit it, then we must have stepped into the signal handler. The | |
6522 | step-resume was only necessary to catch the case of _not_ | |
6523 | stepping into the handler, so delete it, and fall through to | |
6524 | checking whether the step finished. */ | |
6525 | if (ecs->event_thread->stepped_breakpoint) | |
6526 | { | |
6527 | struct breakpoint *sr_bp | |
6528 | = ecs->event_thread->control.step_resume_breakpoint; | |
6529 | ||
8d707a12 PA |
6530 | if (sr_bp != NULL |
6531 | && sr_bp->loc->permanent | |
af48d08f PA |
6532 | && sr_bp->type == bp_hp_step_resume |
6533 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6534 | { | |
4100594e | 6535 | infrun_log_debug ("stepped permanent breakpoint, stopped in handler"); |
af48d08f PA |
6536 | delete_step_resume_breakpoint (ecs->event_thread); |
6537 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6538 | } | |
6539 | } | |
6540 | ||
cdaa5b73 PA |
6541 | /* We come here if we hit a breakpoint but should not stop for it. |
6542 | Possibly we also were stepping and should stop for that. So fall | |
6543 | through and test for stepping. But, if not stepping, do not | |
6544 | stop. */ | |
c906108c | 6545 | |
a7212384 UW |
6546 | /* In all-stop mode, if we're currently stepping but have stopped in |
6547 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6548 | if (switch_back_to_stepped_thread (ecs)) |
6549 | return; | |
776f04fa | 6550 | |
8358c15c | 6551 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6552 | { |
4100594e | 6553 | infrun_log_debug ("step-resume breakpoint is inserted"); |
527159b7 | 6554 | |
488f131b JB |
6555 | /* Having a step-resume breakpoint overrides anything |
6556 | else having to do with stepping commands until | |
6557 | that breakpoint is reached. */ | |
488f131b JB |
6558 | keep_going (ecs); |
6559 | return; | |
6560 | } | |
c5aa993b | 6561 | |
16c381f0 | 6562 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6563 | { |
4100594e | 6564 | infrun_log_debug ("no stepping, continue"); |
488f131b | 6565 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6566 | keep_going (ecs); |
6567 | return; | |
6568 | } | |
c5aa993b | 6569 | |
4b7703ad JB |
6570 | /* Re-fetch current thread's frame in case the code above caused |
6571 | the frame cache to be re-initialized, making our FRAME variable | |
6572 | a dangling pointer. */ | |
6573 | frame = get_current_frame (); | |
628fe4e4 | 6574 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6575 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6576 | |
488f131b | 6577 | /* If stepping through a line, keep going if still within it. |
c906108c | 6578 | |
488f131b JB |
6579 | Note that step_range_end is the address of the first instruction |
6580 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6581 | within it! |
6582 | ||
6583 | Note also that during reverse execution, we may be stepping | |
6584 | through a function epilogue and therefore must detect when | |
6585 | the current-frame changes in the middle of a line. */ | |
6586 | ||
f2ffa92b PA |
6587 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6588 | ecs->event_thread) | |
31410e84 | 6589 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6590 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6591 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6592 | { |
4100594e SM |
6593 | infrun_log_debug |
6594 | ("stepping inside range [%s-%s]", | |
6595 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
6596 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6597 | |
c1e36e3e PA |
6598 | /* Tentatively re-enable range stepping; `resume' disables it if |
6599 | necessary (e.g., if we're stepping over a breakpoint or we | |
6600 | have software watchpoints). */ | |
6601 | ecs->event_thread->control.may_range_step = 1; | |
6602 | ||
b2175913 MS |
6603 | /* When stepping backward, stop at beginning of line range |
6604 | (unless it's the function entry point, in which case | |
6605 | keep going back to the call point). */ | |
f2ffa92b | 6606 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6607 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6608 | && stop_pc != ecs->stop_func_start |
6609 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6610 | end_stepping_range (ecs); |
b2175913 MS |
6611 | else |
6612 | keep_going (ecs); | |
6613 | ||
488f131b JB |
6614 | return; |
6615 | } | |
c5aa993b | 6616 | |
488f131b | 6617 | /* We stepped out of the stepping range. */ |
c906108c | 6618 | |
488f131b | 6619 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6620 | loader dynamic symbol resolution code... |
6621 | ||
6622 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6623 | time loader code and reach the callee's address. | |
6624 | ||
6625 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6626 | the runtime loader code is handled just like any other | |
6627 | undebuggable function call. Now we need only keep stepping | |
6628 | backward through the trampoline code, and that's handled further | |
6629 | down, so there is nothing for us to do here. */ | |
6630 | ||
6631 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6632 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6633 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6634 | { |
4c8c40e6 | 6635 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6636 | gdbarch_skip_solib_resolver (gdbarch, |
6637 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6638 | |
4100594e | 6639 | infrun_log_debug ("stepped into dynsym resolve code"); |
527159b7 | 6640 | |
488f131b JB |
6641 | if (pc_after_resolver) |
6642 | { | |
6643 | /* Set up a step-resume breakpoint at the address | |
6644 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6645 | symtab_and_line sr_sal; |
488f131b | 6646 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6647 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6648 | |
a6d9a66e UW |
6649 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6650 | sr_sal, null_frame_id); | |
c5aa993b | 6651 | } |
c906108c | 6652 | |
488f131b JB |
6653 | keep_going (ecs); |
6654 | return; | |
6655 | } | |
c906108c | 6656 | |
1d509aa6 MM |
6657 | /* Step through an indirect branch thunk. */ |
6658 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6659 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6660 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 | 6661 | { |
4100594e | 6662 | infrun_log_debug ("stepped into indirect branch thunk"); |
1d509aa6 MM |
6663 | keep_going (ecs); |
6664 | return; | |
6665 | } | |
6666 | ||
16c381f0 JK |
6667 | if (ecs->event_thread->control.step_range_end != 1 |
6668 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6669 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6670 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6671 | { |
4100594e | 6672 | infrun_log_debug ("stepped into signal trampoline"); |
42edda50 | 6673 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6674 | a signal trampoline (either by a signal being delivered or by |
6675 | the signal handler returning). Just single-step until the | |
6676 | inferior leaves the trampoline (either by calling the handler | |
6677 | or returning). */ | |
488f131b JB |
6678 | keep_going (ecs); |
6679 | return; | |
6680 | } | |
c906108c | 6681 | |
14132e89 MR |
6682 | /* If we're in the return path from a shared library trampoline, |
6683 | we want to proceed through the trampoline when stepping. */ | |
6684 | /* macro/2012-04-25: This needs to come before the subroutine | |
6685 | call check below as on some targets return trampolines look | |
6686 | like subroutine calls (MIPS16 return thunks). */ | |
6687 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
6688 | ecs->event_thread->suspend.stop_pc, |
6689 | ecs->stop_func_name) | |
14132e89 MR |
6690 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6691 | { | |
6692 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
6693 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6694 | CORE_ADDR real_stop_pc | |
6695 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 | 6696 | |
4100594e | 6697 | infrun_log_debug ("stepped into solib return tramp"); |
14132e89 MR |
6698 | |
6699 | /* Only proceed through if we know where it's going. */ | |
6700 | if (real_stop_pc) | |
6701 | { | |
6702 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6703 | symtab_and_line sr_sal; |
14132e89 MR |
6704 | sr_sal.pc = real_stop_pc; |
6705 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6706 | sr_sal.pspace = get_frame_program_space (frame); | |
6707 | ||
6708 | /* Do not specify what the fp should be when we stop since | |
6709 | on some machines the prologue is where the new fp value | |
6710 | is established. */ | |
6711 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6712 | sr_sal, null_frame_id); | |
6713 | ||
6714 | /* Restart without fiddling with the step ranges or | |
6715 | other state. */ | |
6716 | keep_going (ecs); | |
6717 | return; | |
6718 | } | |
6719 | } | |
6720 | ||
c17eaafe DJ |
6721 | /* Check for subroutine calls. The check for the current frame |
6722 | equalling the step ID is not necessary - the check of the | |
6723 | previous frame's ID is sufficient - but it is a common case and | |
6724 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6725 | |
6726 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6727 | being equal, so to get into this block, both the current and | |
6728 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6729 | /* The outer_frame_id check is a heuristic to detect stepping |
6730 | through startup code. If we step over an instruction which | |
6731 | sets the stack pointer from an invalid value to a valid value, | |
6732 | we may detect that as a subroutine call from the mythical | |
6733 | "outermost" function. This could be fixed by marking | |
6734 | outermost frames as !stack_p,code_p,special_p. Then the | |
6735 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6736 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6737 | for more. */ |
edb3359d | 6738 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6739 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6740 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6741 | ecs->event_thread->control.step_stack_frame_id) |
6742 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6743 | outer_frame_id) |
885eeb5b | 6744 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 6745 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 6746 | { |
f2ffa92b | 6747 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 6748 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6749 | |
4100594e | 6750 | infrun_log_debug ("stepped into subroutine"); |
527159b7 | 6751 | |
b7a084be | 6752 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6753 | { |
6754 | /* I presume that step_over_calls is only 0 when we're | |
6755 | supposed to be stepping at the assembly language level | |
6756 | ("stepi"). Just stop. */ | |
388a8562 | 6757 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6758 | end_stepping_range (ecs); |
95918acb AC |
6759 | return; |
6760 | } | |
8fb3e588 | 6761 | |
388a8562 MS |
6762 | /* Reverse stepping through solib trampolines. */ |
6763 | ||
6764 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6765 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6766 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6767 | || (ecs->stop_func_start == 0 | |
6768 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6769 | { | |
6770 | /* Any solib trampoline code can be handled in reverse | |
6771 | by simply continuing to single-step. We have already | |
6772 | executed the solib function (backwards), and a few | |
6773 | steps will take us back through the trampoline to the | |
6774 | caller. */ | |
6775 | keep_going (ecs); | |
6776 | return; | |
6777 | } | |
6778 | ||
16c381f0 | 6779 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6780 | { |
b2175913 MS |
6781 | /* We're doing a "next". |
6782 | ||
6783 | Normal (forward) execution: set a breakpoint at the | |
6784 | callee's return address (the address at which the caller | |
6785 | will resume). | |
6786 | ||
6787 | Reverse (backward) execution. set the step-resume | |
6788 | breakpoint at the start of the function that we just | |
6789 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6790 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6791 | |
6792 | if (execution_direction == EXEC_REVERSE) | |
6793 | { | |
acf9414f JK |
6794 | /* If we're already at the start of the function, we've either |
6795 | just stepped backward into a single instruction function, | |
6796 | or stepped back out of a signal handler to the first instruction | |
6797 | of the function. Just keep going, which will single-step back | |
6798 | to the caller. */ | |
58c48e72 | 6799 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6800 | { |
acf9414f | 6801 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6802 | symtab_and_line sr_sal; |
acf9414f JK |
6803 | sr_sal.pc = ecs->stop_func_start; |
6804 | sr_sal.pspace = get_frame_program_space (frame); | |
6805 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6806 | sr_sal, null_frame_id); | |
6807 | } | |
b2175913 MS |
6808 | } |
6809 | else | |
568d6575 | 6810 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6811 | |
8567c30f AC |
6812 | keep_going (ecs); |
6813 | return; | |
6814 | } | |
a53c66de | 6815 | |
95918acb | 6816 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6817 | calling routine and the real function), locate the real |
6818 | function. That's what tells us (a) whether we want to step | |
6819 | into it at all, and (b) what prologue we want to run to the | |
6820 | end of, if we do step into it. */ | |
568d6575 | 6821 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6822 | if (real_stop_pc == 0) |
568d6575 | 6823 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6824 | if (real_stop_pc != 0) |
6825 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6826 | |
db5f024e | 6827 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6828 | { |
51abb421 | 6829 | symtab_and_line sr_sal; |
1b2bfbb9 | 6830 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6831 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6832 | |
a6d9a66e UW |
6833 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6834 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6835 | keep_going (ecs); |
6836 | return; | |
1b2bfbb9 RC |
6837 | } |
6838 | ||
95918acb | 6839 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6840 | thinking of stepping into and the function isn't on the skip |
6841 | list, step into it. | |
95918acb | 6842 | |
8fb3e588 AC |
6843 | If there are several symtabs at that PC (e.g. with include |
6844 | files), just want to know whether *any* of them have line | |
6845 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6846 | { |
6847 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6848 | |
95918acb | 6849 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6850 | if (tmp_sal.line != 0 |
85817405 | 6851 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
6852 | tmp_sal) |
6853 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 6854 | { |
b2175913 | 6855 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6856 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6857 | else |
568d6575 | 6858 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6859 | return; |
6860 | } | |
6861 | } | |
6862 | ||
6863 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6864 | set, we stop the step so that the user has a chance to switch |
6865 | in assembly mode. */ | |
16c381f0 | 6866 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6867 | && step_stop_if_no_debug) |
95918acb | 6868 | { |
bdc36728 | 6869 | end_stepping_range (ecs); |
95918acb AC |
6870 | return; |
6871 | } | |
6872 | ||
b2175913 MS |
6873 | if (execution_direction == EXEC_REVERSE) |
6874 | { | |
acf9414f JK |
6875 | /* If we're already at the start of the function, we've either just |
6876 | stepped backward into a single instruction function without line | |
6877 | number info, or stepped back out of a signal handler to the first | |
6878 | instruction of the function without line number info. Just keep | |
6879 | going, which will single-step back to the caller. */ | |
6880 | if (ecs->stop_func_start != stop_pc) | |
6881 | { | |
6882 | /* Set a breakpoint at callee's start address. | |
6883 | From there we can step once and be back in the caller. */ | |
51abb421 | 6884 | symtab_and_line sr_sal; |
acf9414f JK |
6885 | sr_sal.pc = ecs->stop_func_start; |
6886 | sr_sal.pspace = get_frame_program_space (frame); | |
6887 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6888 | sr_sal, null_frame_id); | |
6889 | } | |
b2175913 MS |
6890 | } |
6891 | else | |
6892 | /* Set a breakpoint at callee's return address (the address | |
6893 | at which the caller will resume). */ | |
568d6575 | 6894 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6895 | |
95918acb | 6896 | keep_going (ecs); |
488f131b | 6897 | return; |
488f131b | 6898 | } |
c906108c | 6899 | |
fdd654f3 MS |
6900 | /* Reverse stepping through solib trampolines. */ |
6901 | ||
6902 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6903 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 6904 | { |
f2ffa92b PA |
6905 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6906 | ||
fdd654f3 MS |
6907 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6908 | || (ecs->stop_func_start == 0 | |
6909 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6910 | { | |
6911 | /* Any solib trampoline code can be handled in reverse | |
6912 | by simply continuing to single-step. We have already | |
6913 | executed the solib function (backwards), and a few | |
6914 | steps will take us back through the trampoline to the | |
6915 | caller. */ | |
6916 | keep_going (ecs); | |
6917 | return; | |
6918 | } | |
6919 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6920 | { | |
6921 | /* Stepped backward into the solib dynsym resolver. | |
6922 | Set a breakpoint at its start and continue, then | |
6923 | one more step will take us out. */ | |
51abb421 | 6924 | symtab_and_line sr_sal; |
fdd654f3 | 6925 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 6926 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6927 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6928 | sr_sal, null_frame_id); | |
6929 | keep_going (ecs); | |
6930 | return; | |
6931 | } | |
6932 | } | |
6933 | ||
8c95582d AB |
6934 | /* This always returns the sal for the inner-most frame when we are in a |
6935 | stack of inlined frames, even if GDB actually believes that it is in a | |
6936 | more outer frame. This is checked for below by calls to | |
6937 | inline_skipped_frames. */ | |
f2ffa92b | 6938 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 6939 | |
1b2bfbb9 RC |
6940 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6941 | the trampoline processing logic, however, there are some trampolines | |
6942 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6943 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6944 | && ecs->stop_func_name == NULL |
2afb61aa | 6945 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6946 | { |
4100594e | 6947 | infrun_log_debug ("stepped into undebuggable function"); |
527159b7 | 6948 | |
1b2bfbb9 | 6949 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6950 | undebuggable function (where there is no debugging information |
6951 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6952 | inferior stopped). Since we want to skip this kind of code, |
6953 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6954 | function - unless the user has asked us not to (via |
6955 | set step-mode) or we no longer know how to get back | |
6956 | to the call site. */ | |
6957 | if (step_stop_if_no_debug | |
c7ce8faa | 6958 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6959 | { |
6960 | /* If we have no line number and the step-stop-if-no-debug | |
6961 | is set, we stop the step so that the user has a chance to | |
6962 | switch in assembly mode. */ | |
bdc36728 | 6963 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6964 | return; |
6965 | } | |
6966 | else | |
6967 | { | |
6968 | /* Set a breakpoint at callee's return address (the address | |
6969 | at which the caller will resume). */ | |
568d6575 | 6970 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6971 | keep_going (ecs); |
6972 | return; | |
6973 | } | |
6974 | } | |
6975 | ||
16c381f0 | 6976 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6977 | { |
6978 | /* It is stepi or nexti. We always want to stop stepping after | |
6979 | one instruction. */ | |
4100594e | 6980 | infrun_log_debug ("stepi/nexti"); |
bdc36728 | 6981 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6982 | return; |
6983 | } | |
6984 | ||
2afb61aa | 6985 | if (stop_pc_sal.line == 0) |
488f131b JB |
6986 | { |
6987 | /* We have no line number information. That means to stop | |
6988 | stepping (does this always happen right after one instruction, | |
6989 | when we do "s" in a function with no line numbers, | |
6990 | or can this happen as a result of a return or longjmp?). */ | |
4100594e | 6991 | infrun_log_debug ("line number info"); |
bdc36728 | 6992 | end_stepping_range (ecs); |
488f131b JB |
6993 | return; |
6994 | } | |
c906108c | 6995 | |
edb3359d DJ |
6996 | /* Look for "calls" to inlined functions, part one. If the inline |
6997 | frame machinery detected some skipped call sites, we have entered | |
6998 | a new inline function. */ | |
6999 | ||
7000 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7001 | ecs->event_thread->control.step_frame_id) |
00431a78 | 7002 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 7003 | { |
4100594e | 7004 | infrun_log_debug ("stepped into inlined function"); |
edb3359d | 7005 | |
51abb421 | 7006 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 7007 | |
16c381f0 | 7008 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
7009 | { |
7010 | /* For "step", we're going to stop. But if the call site | |
7011 | for this inlined function is on the same source line as | |
7012 | we were previously stepping, go down into the function | |
7013 | first. Otherwise stop at the call site. */ | |
7014 | ||
7015 | if (call_sal.line == ecs->event_thread->current_line | |
7016 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7017 | { |
7018 | step_into_inline_frame (ecs->event_thread); | |
7019 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7020 | { | |
7021 | keep_going (ecs); | |
7022 | return; | |
7023 | } | |
7024 | } | |
edb3359d | 7025 | |
bdc36728 | 7026 | end_stepping_range (ecs); |
edb3359d DJ |
7027 | return; |
7028 | } | |
7029 | else | |
7030 | { | |
7031 | /* For "next", we should stop at the call site if it is on a | |
7032 | different source line. Otherwise continue through the | |
7033 | inlined function. */ | |
7034 | if (call_sal.line == ecs->event_thread->current_line | |
7035 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7036 | keep_going (ecs); | |
7037 | else | |
bdc36728 | 7038 | end_stepping_range (ecs); |
edb3359d DJ |
7039 | return; |
7040 | } | |
7041 | } | |
7042 | ||
7043 | /* Look for "calls" to inlined functions, part two. If we are still | |
7044 | in the same real function we were stepping through, but we have | |
7045 | to go further up to find the exact frame ID, we are stepping | |
7046 | through a more inlined call beyond its call site. */ | |
7047 | ||
7048 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
7049 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7050 | ecs->event_thread->control.step_frame_id) |
edb3359d | 7051 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7052 | ecs->event_thread->control.step_frame_id)) |
edb3359d | 7053 | { |
4100594e | 7054 | infrun_log_debug ("stepping through inlined function"); |
edb3359d | 7055 | |
4a4c04f1 BE |
7056 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7057 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7058 | keep_going (ecs); |
7059 | else | |
bdc36728 | 7060 | end_stepping_range (ecs); |
edb3359d DJ |
7061 | return; |
7062 | } | |
7063 | ||
8c95582d | 7064 | bool refresh_step_info = true; |
f2ffa92b | 7065 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
7066 | && (ecs->event_thread->current_line != stop_pc_sal.line |
7067 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b | 7068 | { |
8c95582d AB |
7069 | if (stop_pc_sal.is_stmt) |
7070 | { | |
7071 | /* We are at the start of a different line. So stop. Note that | |
7072 | we don't stop if we step into the middle of a different line. | |
7073 | That is said to make things like for (;;) statements work | |
7074 | better. */ | |
4100594e | 7075 | infrun_log_debug ("infrun: stepped to a different line\n"); |
8c95582d AB |
7076 | end_stepping_range (ecs); |
7077 | return; | |
7078 | } | |
7079 | else if (frame_id_eq (get_frame_id (get_current_frame ()), | |
7080 | ecs->event_thread->control.step_frame_id)) | |
7081 | { | |
7082 | /* We are at the start of a different line, however, this line is | |
7083 | not marked as a statement, and we have not changed frame. We | |
7084 | ignore this line table entry, and continue stepping forward, | |
7085 | looking for a better place to stop. */ | |
7086 | refresh_step_info = false; | |
4100594e SM |
7087 | infrun_log_debug ("infrun: stepped to a different line, but " |
7088 | "it's not the start of a statement\n"); | |
8c95582d | 7089 | } |
488f131b | 7090 | } |
c906108c | 7091 | |
488f131b | 7092 | /* We aren't done stepping. |
c906108c | 7093 | |
488f131b JB |
7094 | Optimize by setting the stepping range to the line. |
7095 | (We might not be in the original line, but if we entered a | |
7096 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7097 | things like for(;;) statements work better.) |
7098 | ||
7099 | If we entered a SAL that indicates a non-statement line table entry, | |
7100 | then we update the stepping range, but we don't update the step info, | |
7101 | which includes things like the line number we are stepping away from. | |
7102 | This means we will stop when we find a line table entry that is marked | |
7103 | as is-statement, even if it matches the non-statement one we just | |
7104 | stepped into. */ | |
c906108c | 7105 | |
16c381f0 JK |
7106 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7107 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7108 | ecs->event_thread->control.may_range_step = 1; |
8c95582d AB |
7109 | if (refresh_step_info) |
7110 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7111 | |
4100594e | 7112 | infrun_log_debug ("keep going"); |
488f131b | 7113 | keep_going (ecs); |
104c1213 JM |
7114 | } |
7115 | ||
c447ac0b PA |
7116 | /* In all-stop mode, if we're currently stepping but have stopped in |
7117 | some other thread, we may need to switch back to the stepped | |
7118 | thread. Returns true we set the inferior running, false if we left | |
7119 | it stopped (and the event needs further processing). */ | |
7120 | ||
7121 | static int | |
7122 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
7123 | { | |
fbea99ea | 7124 | if (!target_is_non_stop_p ()) |
c447ac0b | 7125 | { |
99619bea PA |
7126 | struct thread_info *stepping_thread; |
7127 | ||
7128 | /* If any thread is blocked on some internal breakpoint, and we | |
7129 | simply need to step over that breakpoint to get it going | |
7130 | again, do that first. */ | |
7131 | ||
7132 | /* However, if we see an event for the stepping thread, then we | |
7133 | know all other threads have been moved past their breakpoints | |
7134 | already. Let the caller check whether the step is finished, | |
7135 | etc., before deciding to move it past a breakpoint. */ | |
7136 | if (ecs->event_thread->control.step_range_end != 0) | |
7137 | return 0; | |
7138 | ||
7139 | /* Check if the current thread is blocked on an incomplete | |
7140 | step-over, interrupted by a random signal. */ | |
7141 | if (ecs->event_thread->control.trap_expected | |
7142 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7143 | { |
4100594e SM |
7144 | infrun_log_debug ("need to finish step-over of [%s]", |
7145 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
99619bea PA |
7146 | keep_going (ecs); |
7147 | return 1; | |
7148 | } | |
2adfaa28 | 7149 | |
99619bea PA |
7150 | /* Check if the current thread is blocked by a single-step |
7151 | breakpoint of another thread. */ | |
7152 | if (ecs->hit_singlestep_breakpoint) | |
7153 | { | |
4100594e SM |
7154 | infrun_log_debug ("need to step [%s] over single-step breakpoint", |
7155 | target_pid_to_str (ecs->ptid).c_str ()); | |
99619bea PA |
7156 | keep_going (ecs); |
7157 | return 1; | |
7158 | } | |
7159 | ||
4d9d9d04 PA |
7160 | /* If this thread needs yet another step-over (e.g., stepping |
7161 | through a delay slot), do it first before moving on to | |
7162 | another thread. */ | |
7163 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7164 | { | |
4100594e SM |
7165 | infrun_log_debug |
7166 | ("thread [%s] still needs step-over", | |
7167 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
4d9d9d04 PA |
7168 | keep_going (ecs); |
7169 | return 1; | |
7170 | } | |
70509625 | 7171 | |
483805cf PA |
7172 | /* If scheduler locking applies even if not stepping, there's no |
7173 | need to walk over threads. Above we've checked whether the | |
7174 | current thread is stepping. If some other thread not the | |
7175 | event thread is stepping, then it must be that scheduler | |
7176 | locking is not in effect. */ | |
856e7dd6 | 7177 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
7178 | return 0; |
7179 | ||
4d9d9d04 PA |
7180 | /* Otherwise, we no longer expect a trap in the current thread. |
7181 | Clear the trap_expected flag before switching back -- this is | |
7182 | what keep_going does as well, if we call it. */ | |
7183 | ecs->event_thread->control.trap_expected = 0; | |
7184 | ||
7185 | /* Likewise, clear the signal if it should not be passed. */ | |
7186 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7187 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7188 | ||
7189 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 7190 | step/next/etc. */ |
4d9d9d04 PA |
7191 | if (start_step_over ()) |
7192 | { | |
7193 | prepare_to_wait (ecs); | |
7194 | return 1; | |
7195 | } | |
7196 | ||
7197 | /* Look for the stepping/nexting thread. */ | |
483805cf | 7198 | stepping_thread = NULL; |
4d9d9d04 | 7199 | |
08036331 | 7200 | for (thread_info *tp : all_non_exited_threads ()) |
483805cf | 7201 | { |
f3f8ece4 PA |
7202 | switch_to_thread_no_regs (tp); |
7203 | ||
fbea99ea PA |
7204 | /* Ignore threads of processes the caller is not |
7205 | resuming. */ | |
483805cf | 7206 | if (!sched_multi |
5b6d1e4f PA |
7207 | && (tp->inf->process_target () != ecs->target |
7208 | || tp->inf->pid != ecs->ptid.pid ())) | |
483805cf PA |
7209 | continue; |
7210 | ||
7211 | /* When stepping over a breakpoint, we lock all threads | |
7212 | except the one that needs to move past the breakpoint. | |
7213 | If a non-event thread has this set, the "incomplete | |
7214 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
7215 | if (tp->control.trap_expected) |
7216 | { | |
7217 | internal_error (__FILE__, __LINE__, | |
7218 | "[%s] has inconsistent state: " | |
7219 | "trap_expected=%d\n", | |
a068643d | 7220 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
7221 | tp->control.trap_expected); |
7222 | } | |
483805cf PA |
7223 | |
7224 | /* Did we find the stepping thread? */ | |
7225 | if (tp->control.step_range_end) | |
7226 | { | |
7227 | /* Yep. There should only one though. */ | |
7228 | gdb_assert (stepping_thread == NULL); | |
7229 | ||
7230 | /* The event thread is handled at the top, before we | |
7231 | enter this loop. */ | |
7232 | gdb_assert (tp != ecs->event_thread); | |
7233 | ||
7234 | /* If some thread other than the event thread is | |
7235 | stepping, then scheduler locking can't be in effect, | |
7236 | otherwise we wouldn't have resumed the current event | |
7237 | thread in the first place. */ | |
856e7dd6 | 7238 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
7239 | |
7240 | stepping_thread = tp; | |
7241 | } | |
99619bea PA |
7242 | } |
7243 | ||
483805cf | 7244 | if (stepping_thread != NULL) |
99619bea | 7245 | { |
4100594e | 7246 | infrun_log_debug ("switching back to stepped thread"); |
c447ac0b | 7247 | |
2ac7589c PA |
7248 | if (keep_going_stepped_thread (stepping_thread)) |
7249 | { | |
7250 | prepare_to_wait (ecs); | |
7251 | return 1; | |
7252 | } | |
7253 | } | |
f3f8ece4 PA |
7254 | |
7255 | switch_to_thread (ecs->event_thread); | |
2ac7589c | 7256 | } |
2adfaa28 | 7257 | |
2ac7589c PA |
7258 | return 0; |
7259 | } | |
2adfaa28 | 7260 | |
2ac7589c PA |
7261 | /* Set a previously stepped thread back to stepping. Returns true on |
7262 | success, false if the resume is not possible (e.g., the thread | |
7263 | vanished). */ | |
7264 | ||
7265 | static int | |
7266 | keep_going_stepped_thread (struct thread_info *tp) | |
7267 | { | |
7268 | struct frame_info *frame; | |
2ac7589c PA |
7269 | struct execution_control_state ecss; |
7270 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7271 | |
2ac7589c PA |
7272 | /* If the stepping thread exited, then don't try to switch back and |
7273 | resume it, which could fail in several different ways depending | |
7274 | on the target. Instead, just keep going. | |
2adfaa28 | 7275 | |
2ac7589c PA |
7276 | We can find a stepping dead thread in the thread list in two |
7277 | cases: | |
2adfaa28 | 7278 | |
2ac7589c PA |
7279 | - The target supports thread exit events, and when the target |
7280 | tries to delete the thread from the thread list, inferior_ptid | |
7281 | pointed at the exiting thread. In such case, calling | |
7282 | delete_thread does not really remove the thread from the list; | |
7283 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7284 | |
2ac7589c PA |
7285 | - The target's debug interface does not support thread exit |
7286 | events, and so we have no idea whatsoever if the previously | |
7287 | stepping thread is still alive. For that reason, we need to | |
7288 | synchronously query the target now. */ | |
2adfaa28 | 7289 | |
00431a78 | 7290 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c | 7291 | { |
4100594e SM |
7292 | infrun_log_debug ("not resuming previously stepped thread, it has " |
7293 | "vanished"); | |
2ac7589c | 7294 | |
00431a78 | 7295 | delete_thread (tp); |
2ac7589c | 7296 | return 0; |
c447ac0b | 7297 | } |
2ac7589c | 7298 | |
4100594e | 7299 | infrun_log_debug ("resuming previously stepped thread"); |
2ac7589c PA |
7300 | |
7301 | reset_ecs (ecs, tp); | |
00431a78 | 7302 | switch_to_thread (tp); |
2ac7589c | 7303 | |
f2ffa92b | 7304 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 7305 | frame = get_current_frame (); |
2ac7589c PA |
7306 | |
7307 | /* If the PC of the thread we were trying to single-step has | |
7308 | changed, then that thread has trapped or been signaled, but the | |
7309 | event has not been reported to GDB yet. Re-poll the target | |
7310 | looking for this particular thread's event (i.e. temporarily | |
7311 | enable schedlock) by: | |
7312 | ||
7313 | - setting a break at the current PC | |
7314 | - resuming that particular thread, only (by setting trap | |
7315 | expected) | |
7316 | ||
7317 | This prevents us continuously moving the single-step breakpoint | |
7318 | forward, one instruction at a time, overstepping. */ | |
7319 | ||
f2ffa92b | 7320 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
7321 | { |
7322 | ptid_t resume_ptid; | |
7323 | ||
4100594e SM |
7324 | infrun_log_debug ("expected thread advanced also (%s -> %s)", |
7325 | paddress (target_gdbarch (), tp->prev_pc), | |
7326 | paddress (target_gdbarch (), tp->suspend.stop_pc)); | |
2ac7589c PA |
7327 | |
7328 | /* Clear the info of the previous step-over, as it's no longer | |
7329 | valid (if the thread was trying to step over a breakpoint, it | |
7330 | has already succeeded). It's what keep_going would do too, | |
7331 | if we called it. Do this before trying to insert the sss | |
7332 | breakpoint, otherwise if we were previously trying to step | |
7333 | over this exact address in another thread, the breakpoint is | |
7334 | skipped. */ | |
7335 | clear_step_over_info (); | |
7336 | tp->control.trap_expected = 0; | |
7337 | ||
7338 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7339 | get_frame_address_space (frame), | |
f2ffa92b | 7340 | tp->suspend.stop_pc); |
2ac7589c | 7341 | |
719546c4 | 7342 | tp->resumed = true; |
fbea99ea | 7343 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7344 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7345 | } | |
7346 | else | |
7347 | { | |
4100594e | 7348 | infrun_log_debug ("expected thread still hasn't advanced"); |
2ac7589c PA |
7349 | |
7350 | keep_going_pass_signal (ecs); | |
7351 | } | |
7352 | return 1; | |
c447ac0b PA |
7353 | } |
7354 | ||
8b061563 PA |
7355 | /* Is thread TP in the middle of (software or hardware) |
7356 | single-stepping? (Note the result of this function must never be | |
7357 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7358 | |
a289b8f6 | 7359 | static int |
b3444185 | 7360 | currently_stepping (struct thread_info *tp) |
a7212384 | 7361 | { |
8358c15c JK |
7362 | return ((tp->control.step_range_end |
7363 | && tp->control.step_resume_breakpoint == NULL) | |
7364 | || tp->control.trap_expected | |
af48d08f | 7365 | || tp->stepped_breakpoint |
8358c15c | 7366 | || bpstat_should_step ()); |
a7212384 UW |
7367 | } |
7368 | ||
b2175913 MS |
7369 | /* Inferior has stepped into a subroutine call with source code that |
7370 | we should not step over. Do step to the first line of code in | |
7371 | it. */ | |
c2c6d25f JM |
7372 | |
7373 | static void | |
568d6575 UW |
7374 | handle_step_into_function (struct gdbarch *gdbarch, |
7375 | struct execution_control_state *ecs) | |
c2c6d25f | 7376 | { |
7e324e48 GB |
7377 | fill_in_stop_func (gdbarch, ecs); |
7378 | ||
f2ffa92b PA |
7379 | compunit_symtab *cust |
7380 | = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); | |
43f3e411 | 7381 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7382 | ecs->stop_func_start |
7383 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7384 | |
51abb421 | 7385 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7386 | /* Use the step_resume_break to step until the end of the prologue, |
7387 | even if that involves jumps (as it seems to on the vax under | |
7388 | 4.2). */ | |
7389 | /* If the prologue ends in the middle of a source line, continue to | |
7390 | the end of that source line (if it is still within the function). | |
7391 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7392 | if (stop_func_sal.end |
7393 | && stop_func_sal.pc != ecs->stop_func_start | |
7394 | && stop_func_sal.end < ecs->stop_func_end) | |
7395 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7396 | |
2dbd5e30 KB |
7397 | /* Architectures which require breakpoint adjustment might not be able |
7398 | to place a breakpoint at the computed address. If so, the test | |
7399 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7400 | ecs->stop_func_start to an address at which a breakpoint may be | |
7401 | legitimately placed. | |
8fb3e588 | 7402 | |
2dbd5e30 KB |
7403 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7404 | made, GDB will enter an infinite loop when stepping through | |
7405 | optimized code consisting of VLIW instructions which contain | |
7406 | subinstructions corresponding to different source lines. On | |
7407 | FR-V, it's not permitted to place a breakpoint on any but the | |
7408 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7409 | set, GDB will adjust the breakpoint address to the beginning of | |
7410 | the VLIW instruction. Thus, we need to make the corresponding | |
7411 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7412 | |
568d6575 | 7413 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7414 | { |
7415 | ecs->stop_func_start | |
568d6575 | 7416 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7417 | ecs->stop_func_start); |
2dbd5e30 KB |
7418 | } |
7419 | ||
f2ffa92b | 7420 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7421 | { |
7422 | /* We are already there: stop now. */ | |
bdc36728 | 7423 | end_stepping_range (ecs); |
c2c6d25f JM |
7424 | return; |
7425 | } | |
7426 | else | |
7427 | { | |
7428 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7429 | symtab_and_line sr_sal; |
c2c6d25f JM |
7430 | sr_sal.pc = ecs->stop_func_start; |
7431 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7432 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7433 | |
c2c6d25f | 7434 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7435 | some machines the prologue is where the new fp value is |
7436 | established. */ | |
a6d9a66e | 7437 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7438 | |
7439 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7440 | ecs->event_thread->control.step_range_end |
7441 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7442 | } |
7443 | keep_going (ecs); | |
7444 | } | |
d4f3574e | 7445 | |
b2175913 MS |
7446 | /* Inferior has stepped backward into a subroutine call with source |
7447 | code that we should not step over. Do step to the beginning of the | |
7448 | last line of code in it. */ | |
7449 | ||
7450 | static void | |
568d6575 UW |
7451 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7452 | struct execution_control_state *ecs) | |
b2175913 | 7453 | { |
43f3e411 | 7454 | struct compunit_symtab *cust; |
167e4384 | 7455 | struct symtab_and_line stop_func_sal; |
b2175913 | 7456 | |
7e324e48 GB |
7457 | fill_in_stop_func (gdbarch, ecs); |
7458 | ||
f2ffa92b | 7459 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7460 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7461 | ecs->stop_func_start |
7462 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7463 | |
f2ffa92b | 7464 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7465 | |
7466 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7467 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7468 | { |
7469 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7470 | end_stepping_range (ecs); |
b2175913 MS |
7471 | } |
7472 | else | |
7473 | { | |
7474 | /* Else just reset the step range and keep going. | |
7475 | No step-resume breakpoint, they don't work for | |
7476 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7477 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7478 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7479 | keep_going (ecs); |
7480 | } | |
7481 | return; | |
7482 | } | |
7483 | ||
d3169d93 | 7484 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7485 | This is used to both functions and to skip over code. */ |
7486 | ||
7487 | static void | |
2c03e5be PA |
7488 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7489 | struct symtab_and_line sr_sal, | |
7490 | struct frame_id sr_id, | |
7491 | enum bptype sr_type) | |
44cbf7b5 | 7492 | { |
611c83ae PA |
7493 | /* There should never be more than one step-resume or longjmp-resume |
7494 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7495 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7496 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7497 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 | 7498 | |
4100594e SM |
7499 | infrun_log_debug ("inserting step-resume breakpoint at %s", |
7500 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7501 | |
8358c15c | 7502 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7503 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7504 | } |
7505 | ||
9da8c2a0 | 7506 | void |
2c03e5be PA |
7507 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7508 | struct symtab_and_line sr_sal, | |
7509 | struct frame_id sr_id) | |
7510 | { | |
7511 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7512 | sr_sal, sr_id, | |
7513 | bp_step_resume); | |
44cbf7b5 | 7514 | } |
7ce450bd | 7515 | |
2c03e5be PA |
7516 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7517 | This is used to skip a potential signal handler. | |
7ce450bd | 7518 | |
14e60db5 DJ |
7519 | This is called with the interrupted function's frame. The signal |
7520 | handler, when it returns, will resume the interrupted function at | |
7521 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7522 | |
7523 | static void | |
2c03e5be | 7524 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7525 | { |
f4c1edd8 | 7526 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7527 | |
51abb421 PA |
7528 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7529 | ||
7530 | symtab_and_line sr_sal; | |
568d6575 | 7531 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7532 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7533 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7534 | |
2c03e5be PA |
7535 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7536 | get_stack_frame_id (return_frame), | |
7537 | bp_hp_step_resume); | |
d303a6c7 AC |
7538 | } |
7539 | ||
2c03e5be PA |
7540 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7541 | is used to skip a function after stepping into it (for "next" or if | |
7542 | the called function has no debugging information). | |
14e60db5 DJ |
7543 | |
7544 | The current function has almost always been reached by single | |
7545 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7546 | current function, and the breakpoint will be set at the caller's | |
7547 | resume address. | |
7548 | ||
7549 | This is a separate function rather than reusing | |
2c03e5be | 7550 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7551 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7552 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7553 | |
7554 | static void | |
7555 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7556 | { | |
14e60db5 DJ |
7557 | /* We shouldn't have gotten here if we don't know where the call site |
7558 | is. */ | |
c7ce8faa | 7559 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7560 | |
51abb421 | 7561 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7562 | |
51abb421 | 7563 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7564 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7565 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7566 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7567 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7568 | |
a6d9a66e | 7569 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7570 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7571 | } |
7572 | ||
611c83ae PA |
7573 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7574 | new breakpoint at the target of a jmp_buf. The handling of | |
7575 | longjmp-resume uses the same mechanisms used for handling | |
7576 | "step-resume" breakpoints. */ | |
7577 | ||
7578 | static void | |
a6d9a66e | 7579 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7580 | { |
e81a37f7 TT |
7581 | /* There should never be more than one longjmp-resume breakpoint per |
7582 | thread, so we should never be setting a new | |
611c83ae | 7583 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7584 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae | 7585 | |
4100594e SM |
7586 | infrun_log_debug ("inserting longjmp-resume breakpoint at %s", |
7587 | paddress (gdbarch, pc)); | |
611c83ae | 7588 | |
e81a37f7 | 7589 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7590 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7591 | } |
7592 | ||
186c406b TT |
7593 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7594 | the exception. The block B is the block of the unwinder debug hook | |
7595 | function. FRAME is the frame corresponding to the call to this | |
7596 | function. SYM is the symbol of the function argument holding the | |
7597 | target PC of the exception. */ | |
7598 | ||
7599 | static void | |
7600 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7601 | const struct block *b, |
186c406b TT |
7602 | struct frame_info *frame, |
7603 | struct symbol *sym) | |
7604 | { | |
a70b8144 | 7605 | try |
186c406b | 7606 | { |
63e43d3a | 7607 | struct block_symbol vsym; |
186c406b TT |
7608 | struct value *value; |
7609 | CORE_ADDR handler; | |
7610 | struct breakpoint *bp; | |
7611 | ||
987012b8 | 7612 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 7613 | b, VAR_DOMAIN); |
63e43d3a | 7614 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7615 | /* If the value was optimized out, revert to the old behavior. */ |
7616 | if (! value_optimized_out (value)) | |
7617 | { | |
7618 | handler = value_as_address (value); | |
7619 | ||
4100594e SM |
7620 | infrun_log_debug ("exception resume at %lx", |
7621 | (unsigned long) handler); | |
186c406b TT |
7622 | |
7623 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7624 | handler, |
7625 | bp_exception_resume).release (); | |
c70a6932 JK |
7626 | |
7627 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7628 | frame = NULL; | |
7629 | ||
5d5658a1 | 7630 | bp->thread = tp->global_num; |
186c406b TT |
7631 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7632 | } | |
7633 | } | |
230d2906 | 7634 | catch (const gdb_exception_error &e) |
492d29ea PA |
7635 | { |
7636 | /* We want to ignore errors here. */ | |
7637 | } | |
186c406b TT |
7638 | } |
7639 | ||
28106bc2 SDJ |
7640 | /* A helper for check_exception_resume that sets an |
7641 | exception-breakpoint based on a SystemTap probe. */ | |
7642 | ||
7643 | static void | |
7644 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7645 | const struct bound_probe *probe, |
28106bc2 SDJ |
7646 | struct frame_info *frame) |
7647 | { | |
7648 | struct value *arg_value; | |
7649 | CORE_ADDR handler; | |
7650 | struct breakpoint *bp; | |
7651 | ||
7652 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7653 | if (!arg_value) | |
7654 | return; | |
7655 | ||
7656 | handler = value_as_address (arg_value); | |
7657 | ||
4100594e SM |
7658 | infrun_log_debug ("exception resume at %s", |
7659 | paddress (probe->objfile->arch (), handler)); | |
28106bc2 SDJ |
7660 | |
7661 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7662 | handler, bp_exception_resume).release (); |
5d5658a1 | 7663 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7664 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7665 | } | |
7666 | ||
186c406b TT |
7667 | /* This is called when an exception has been intercepted. Check to |
7668 | see whether the exception's destination is of interest, and if so, | |
7669 | set an exception resume breakpoint there. */ | |
7670 | ||
7671 | static void | |
7672 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7673 | struct frame_info *frame) |
186c406b | 7674 | { |
729662a5 | 7675 | struct bound_probe probe; |
28106bc2 SDJ |
7676 | struct symbol *func; |
7677 | ||
7678 | /* First see if this exception unwinding breakpoint was set via a | |
7679 | SystemTap probe point. If so, the probe has two arguments: the | |
7680 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7681 | set a breakpoint there. */ | |
6bac7473 | 7682 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7683 | if (probe.prob) |
28106bc2 | 7684 | { |
729662a5 | 7685 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7686 | return; |
7687 | } | |
7688 | ||
7689 | func = get_frame_function (frame); | |
7690 | if (!func) | |
7691 | return; | |
186c406b | 7692 | |
a70b8144 | 7693 | try |
186c406b | 7694 | { |
3977b71f | 7695 | const struct block *b; |
8157b174 | 7696 | struct block_iterator iter; |
186c406b TT |
7697 | struct symbol *sym; |
7698 | int argno = 0; | |
7699 | ||
7700 | /* The exception breakpoint is a thread-specific breakpoint on | |
7701 | the unwinder's debug hook, declared as: | |
7702 | ||
7703 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7704 | ||
7705 | The CFA argument indicates the frame to which control is | |
7706 | about to be transferred. HANDLER is the destination PC. | |
7707 | ||
7708 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7709 | This is not extremely efficient but it avoids issues in gdb | |
7710 | with computing the DWARF CFA, and it also works even in weird | |
7711 | cases such as throwing an exception from inside a signal | |
7712 | handler. */ | |
7713 | ||
7714 | b = SYMBOL_BLOCK_VALUE (func); | |
7715 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7716 | { | |
7717 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7718 | continue; | |
7719 | ||
7720 | if (argno == 0) | |
7721 | ++argno; | |
7722 | else | |
7723 | { | |
7724 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7725 | b, frame, sym); | |
7726 | break; | |
7727 | } | |
7728 | } | |
7729 | } | |
230d2906 | 7730 | catch (const gdb_exception_error &e) |
492d29ea PA |
7731 | { |
7732 | } | |
186c406b TT |
7733 | } |
7734 | ||
104c1213 | 7735 | static void |
22bcd14b | 7736 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7737 | { |
4100594e | 7738 | infrun_log_debug ("stop_waiting"); |
527159b7 | 7739 | |
cd0fc7c3 SS |
7740 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7741 | ecs->wait_some_more = 0; | |
fbea99ea | 7742 | |
53cccef1 | 7743 | /* If all-stop, but there exists a non-stop target, stop all |
fbea99ea | 7744 | threads now that we're presenting the stop to the user. */ |
53cccef1 | 7745 | if (!non_stop && exists_non_stop_target ()) |
fbea99ea | 7746 | stop_all_threads (); |
cd0fc7c3 SS |
7747 | } |
7748 | ||
4d9d9d04 PA |
7749 | /* Like keep_going, but passes the signal to the inferior, even if the |
7750 | signal is set to nopass. */ | |
d4f3574e SS |
7751 | |
7752 | static void | |
4d9d9d04 | 7753 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7754 | { |
d7e15655 | 7755 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 7756 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7757 | |
d4f3574e | 7758 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 7759 | ecs->event_thread->prev_pc |
fc75c28b | 7760 | = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 7761 | |
4d9d9d04 | 7762 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7763 | { |
4d9d9d04 PA |
7764 | struct thread_info *tp = ecs->event_thread; |
7765 | ||
4100594e SM |
7766 | infrun_log_debug ("%s has trap_expected set, " |
7767 | "resuming to collect trap", | |
7768 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 | 7769 | |
a9ba6bae PA |
7770 | /* We haven't yet gotten our trap, and either: intercepted a |
7771 | non-signal event (e.g., a fork); or took a signal which we | |
7772 | are supposed to pass through to the inferior. Simply | |
7773 | continue. */ | |
64ce06e4 | 7774 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7775 | } |
372316f1 PA |
7776 | else if (step_over_info_valid_p ()) |
7777 | { | |
7778 | /* Another thread is stepping over a breakpoint in-line. If | |
7779 | this thread needs a step-over too, queue the request. In | |
7780 | either case, this resume must be deferred for later. */ | |
7781 | struct thread_info *tp = ecs->event_thread; | |
7782 | ||
7783 | if (ecs->hit_singlestep_breakpoint | |
7784 | || thread_still_needs_step_over (tp)) | |
7785 | { | |
4100594e SM |
7786 | infrun_log_debug ("step-over already in progress: " |
7787 | "step-over for %s deferred", | |
7788 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
7789 | thread_step_over_chain_enqueue (tp); |
7790 | } | |
7791 | else | |
7792 | { | |
4100594e SM |
7793 | infrun_log_debug ("step-over in progress: resume of %s deferred", |
7794 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 7795 | } |
372316f1 | 7796 | } |
d4f3574e SS |
7797 | else |
7798 | { | |
31e77af2 | 7799 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7800 | int remove_bp; |
7801 | int remove_wps; | |
8d297bbf | 7802 | step_over_what step_what; |
31e77af2 | 7803 | |
d4f3574e | 7804 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7805 | anyway (if we got a signal, the user asked it be passed to |
7806 | the child) | |
7807 | -- or -- | |
7808 | We got our expected trap, but decided we should resume from | |
7809 | it. | |
d4f3574e | 7810 | |
a9ba6bae | 7811 | We're going to run this baby now! |
d4f3574e | 7812 | |
c36b740a VP |
7813 | Note that insert_breakpoints won't try to re-insert |
7814 | already inserted breakpoints. Therefore, we don't | |
7815 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7816 | |
31e77af2 PA |
7817 | /* If we need to step over a breakpoint, and we're not using |
7818 | displaced stepping to do so, insert all breakpoints | |
7819 | (watchpoints, etc.) but the one we're stepping over, step one | |
7820 | instruction, and then re-insert the breakpoint when that step | |
7821 | is finished. */ | |
963f9c80 | 7822 | |
6c4cfb24 PA |
7823 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7824 | ||
963f9c80 | 7825 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7826 | || (step_what & STEP_OVER_BREAKPOINT)); |
7827 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7828 | |
cb71640d PA |
7829 | /* We can't use displaced stepping if we need to step past a |
7830 | watchpoint. The instruction copied to the scratch pad would | |
7831 | still trigger the watchpoint. */ | |
7832 | if (remove_bp | |
3fc8eb30 | 7833 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7834 | { |
a01bda52 | 7835 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
7836 | regcache_read_pc (regcache), remove_wps, |
7837 | ecs->event_thread->global_num); | |
45e8c884 | 7838 | } |
963f9c80 | 7839 | else if (remove_wps) |
21edc42f | 7840 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
7841 | |
7842 | /* If we now need to do an in-line step-over, we need to stop | |
7843 | all other threads. Note this must be done before | |
7844 | insert_breakpoints below, because that removes the breakpoint | |
7845 | we're about to step over, otherwise other threads could miss | |
7846 | it. */ | |
fbea99ea | 7847 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7848 | stop_all_threads (); |
abbb1732 | 7849 | |
31e77af2 | 7850 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 7851 | try |
31e77af2 PA |
7852 | { |
7853 | insert_breakpoints (); | |
7854 | } | |
230d2906 | 7855 | catch (const gdb_exception_error &e) |
31e77af2 PA |
7856 | { |
7857 | exception_print (gdb_stderr, e); | |
22bcd14b | 7858 | stop_waiting (ecs); |
bdf2a94a | 7859 | clear_step_over_info (); |
31e77af2 | 7860 | return; |
d4f3574e SS |
7861 | } |
7862 | ||
963f9c80 | 7863 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7864 | |
64ce06e4 | 7865 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7866 | } |
7867 | ||
488f131b | 7868 | prepare_to_wait (ecs); |
d4f3574e SS |
7869 | } |
7870 | ||
4d9d9d04 PA |
7871 | /* Called when we should continue running the inferior, because the |
7872 | current event doesn't cause a user visible stop. This does the | |
7873 | resuming part; waiting for the next event is done elsewhere. */ | |
7874 | ||
7875 | static void | |
7876 | keep_going (struct execution_control_state *ecs) | |
7877 | { | |
7878 | if (ecs->event_thread->control.trap_expected | |
7879 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7880 | ecs->event_thread->control.trap_expected = 0; | |
7881 | ||
7882 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7883 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7884 | keep_going_pass_signal (ecs); | |
7885 | } | |
7886 | ||
104c1213 JM |
7887 | /* This function normally comes after a resume, before |
7888 | handle_inferior_event exits. It takes care of any last bits of | |
7889 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7890 | |
104c1213 JM |
7891 | static void |
7892 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7893 | { |
4100594e | 7894 | infrun_log_debug ("prepare_to_wait"); |
104c1213 | 7895 | |
104c1213 | 7896 | ecs->wait_some_more = 1; |
0b333c5e PA |
7897 | |
7898 | if (!target_is_async_p ()) | |
7899 | mark_infrun_async_event_handler (); | |
c906108c | 7900 | } |
11cf8741 | 7901 | |
fd664c91 | 7902 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7903 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7904 | |
7905 | static void | |
bdc36728 | 7906 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7907 | { |
bdc36728 | 7908 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7909 | stop_waiting (ecs); |
fd664c91 PA |
7910 | } |
7911 | ||
33d62d64 JK |
7912 | /* Several print_*_reason functions to print why the inferior has stopped. |
7913 | We always print something when the inferior exits, or receives a signal. | |
7914 | The rest of the cases are dealt with later on in normal_stop and | |
7915 | print_it_typical. Ideally there should be a call to one of these | |
7916 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7917 | stop_waiting is called. |
33d62d64 | 7918 | |
fd664c91 PA |
7919 | Note that we don't call these directly, instead we delegate that to |
7920 | the interpreters, through observers. Interpreters then call these | |
7921 | with whatever uiout is right. */ | |
33d62d64 | 7922 | |
fd664c91 PA |
7923 | void |
7924 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7925 | { |
fd664c91 | 7926 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7927 | |
112e8700 | 7928 | if (uiout->is_mi_like_p ()) |
fd664c91 | 7929 | { |
112e8700 | 7930 | uiout->field_string ("reason", |
fd664c91 PA |
7931 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
7932 | } | |
7933 | } | |
33d62d64 | 7934 | |
fd664c91 PA |
7935 | void |
7936 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7937 | { |
33d62d64 | 7938 | annotate_signalled (); |
112e8700 SM |
7939 | if (uiout->is_mi_like_p ()) |
7940 | uiout->field_string | |
7941 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7942 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 7943 | annotate_signal_name (); |
112e8700 | 7944 | uiout->field_string ("signal-name", |
2ea28649 | 7945 | gdb_signal_to_name (siggnal)); |
33d62d64 | 7946 | annotate_signal_name_end (); |
112e8700 | 7947 | uiout->text (", "); |
33d62d64 | 7948 | annotate_signal_string (); |
112e8700 | 7949 | uiout->field_string ("signal-meaning", |
2ea28649 | 7950 | gdb_signal_to_string (siggnal)); |
33d62d64 | 7951 | annotate_signal_string_end (); |
112e8700 SM |
7952 | uiout->text (".\n"); |
7953 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
7954 | } |
7955 | ||
fd664c91 PA |
7956 | void |
7957 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7958 | { |
fda326dd | 7959 | struct inferior *inf = current_inferior (); |
a068643d | 7960 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 7961 | |
33d62d64 JK |
7962 | annotate_exited (exitstatus); |
7963 | if (exitstatus) | |
7964 | { | |
112e8700 SM |
7965 | if (uiout->is_mi_like_p ()) |
7966 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
7967 | std::string exit_code_str |
7968 | = string_printf ("0%o", (unsigned int) exitstatus); | |
7969 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
7970 | plongest (inf->num), pidstr.c_str (), | |
7971 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
7972 | } |
7973 | else | |
11cf8741 | 7974 | { |
112e8700 SM |
7975 | if (uiout->is_mi_like_p ()) |
7976 | uiout->field_string | |
7977 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
7978 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
7979 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 7980 | } |
33d62d64 JK |
7981 | } |
7982 | ||
012b3a21 WT |
7983 | /* Some targets/architectures can do extra processing/display of |
7984 | segmentation faults. E.g., Intel MPX boundary faults. | |
7985 | Call the architecture dependent function to handle the fault. */ | |
7986 | ||
7987 | static void | |
7988 | handle_segmentation_fault (struct ui_out *uiout) | |
7989 | { | |
7990 | struct regcache *regcache = get_current_regcache (); | |
ac7936df | 7991 | struct gdbarch *gdbarch = regcache->arch (); |
012b3a21 WT |
7992 | |
7993 | if (gdbarch_handle_segmentation_fault_p (gdbarch)) | |
7994 | gdbarch_handle_segmentation_fault (gdbarch, uiout); | |
7995 | } | |
7996 | ||
fd664c91 PA |
7997 | void |
7998 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 7999 | { |
f303dbd6 PA |
8000 | struct thread_info *thr = inferior_thread (); |
8001 | ||
33d62d64 JK |
8002 | annotate_signal (); |
8003 | ||
112e8700 | 8004 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
8005 | ; |
8006 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 8007 | { |
f303dbd6 | 8008 | const char *name; |
33d62d64 | 8009 | |
112e8700 | 8010 | uiout->text ("\nThread "); |
33eca680 | 8011 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 PA |
8012 | |
8013 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
8014 | if (name != NULL) | |
8015 | { | |
112e8700 | 8016 | uiout->text (" \""); |
33eca680 | 8017 | uiout->field_string ("name", name); |
112e8700 | 8018 | uiout->text ("\""); |
f303dbd6 | 8019 | } |
33d62d64 | 8020 | } |
f303dbd6 | 8021 | else |
112e8700 | 8022 | uiout->text ("\nProgram"); |
f303dbd6 | 8023 | |
112e8700 SM |
8024 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8025 | uiout->text (" stopped"); | |
33d62d64 JK |
8026 | else |
8027 | { | |
112e8700 | 8028 | uiout->text (" received signal "); |
8b93c638 | 8029 | annotate_signal_name (); |
112e8700 SM |
8030 | if (uiout->is_mi_like_p ()) |
8031 | uiout->field_string | |
8032 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8033 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8034 | annotate_signal_name_end (); |
112e8700 | 8035 | uiout->text (", "); |
8b93c638 | 8036 | annotate_signal_string (); |
112e8700 | 8037 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 WT |
8038 | |
8039 | if (siggnal == GDB_SIGNAL_SEGV) | |
8040 | handle_segmentation_fault (uiout); | |
8041 | ||
8b93c638 | 8042 | annotate_signal_string_end (); |
33d62d64 | 8043 | } |
112e8700 | 8044 | uiout->text (".\n"); |
33d62d64 | 8045 | } |
252fbfc8 | 8046 | |
fd664c91 PA |
8047 | void |
8048 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8049 | { |
112e8700 | 8050 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8051 | } |
43ff13b4 | 8052 | |
0c7e1a46 PA |
8053 | /* Print current location without a level number, if we have changed |
8054 | functions or hit a breakpoint. Print source line if we have one. | |
8055 | bpstat_print contains the logic deciding in detail what to print, | |
8056 | based on the event(s) that just occurred. */ | |
8057 | ||
243a9253 PA |
8058 | static void |
8059 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8060 | { |
8061 | int bpstat_ret; | |
f486487f | 8062 | enum print_what source_flag; |
0c7e1a46 PA |
8063 | int do_frame_printing = 1; |
8064 | struct thread_info *tp = inferior_thread (); | |
8065 | ||
8066 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8067 | switch (bpstat_ret) | |
8068 | { | |
8069 | case PRINT_UNKNOWN: | |
8070 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8071 | should) carry around the function and does (or should) use | |
8072 | that when doing a frame comparison. */ | |
8073 | if (tp->control.stop_step | |
8074 | && frame_id_eq (tp->control.step_frame_id, | |
8075 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
8076 | && (tp->control.step_start_function |
8077 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
8078 | { |
8079 | /* Finished step, just print source line. */ | |
8080 | source_flag = SRC_LINE; | |
8081 | } | |
8082 | else | |
8083 | { | |
8084 | /* Print location and source line. */ | |
8085 | source_flag = SRC_AND_LOC; | |
8086 | } | |
8087 | break; | |
8088 | case PRINT_SRC_AND_LOC: | |
8089 | /* Print location and source line. */ | |
8090 | source_flag = SRC_AND_LOC; | |
8091 | break; | |
8092 | case PRINT_SRC_ONLY: | |
8093 | source_flag = SRC_LINE; | |
8094 | break; | |
8095 | case PRINT_NOTHING: | |
8096 | /* Something bogus. */ | |
8097 | source_flag = SRC_LINE; | |
8098 | do_frame_printing = 0; | |
8099 | break; | |
8100 | default: | |
8101 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8102 | } | |
8103 | ||
8104 | /* The behavior of this routine with respect to the source | |
8105 | flag is: | |
8106 | SRC_LINE: Print only source line | |
8107 | LOCATION: Print only location | |
8108 | SRC_AND_LOC: Print location and source line. */ | |
8109 | if (do_frame_printing) | |
8110 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8111 | } |
8112 | ||
243a9253 PA |
8113 | /* See infrun.h. */ |
8114 | ||
8115 | void | |
4c7d57e7 | 8116 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8117 | { |
243a9253 | 8118 | struct target_waitstatus last; |
243a9253 PA |
8119 | struct thread_info *tp; |
8120 | ||
5b6d1e4f | 8121 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8122 | |
67ad9399 TT |
8123 | { |
8124 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8125 | |
67ad9399 | 8126 | print_stop_location (&last); |
243a9253 | 8127 | |
67ad9399 | 8128 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8129 | if (displays) |
8130 | do_displays (); | |
67ad9399 | 8131 | } |
243a9253 PA |
8132 | |
8133 | tp = inferior_thread (); | |
8134 | if (tp->thread_fsm != NULL | |
46e3ed7f | 8135 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
8136 | { |
8137 | struct return_value_info *rv; | |
8138 | ||
46e3ed7f | 8139 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
8140 | if (rv != NULL) |
8141 | print_return_value (uiout, rv); | |
8142 | } | |
0c7e1a46 PA |
8143 | } |
8144 | ||
388a7084 PA |
8145 | /* See infrun.h. */ |
8146 | ||
8147 | void | |
8148 | maybe_remove_breakpoints (void) | |
8149 | { | |
8150 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
8151 | { | |
8152 | if (remove_breakpoints ()) | |
8153 | { | |
223ffa71 | 8154 | target_terminal::ours_for_output (); |
388a7084 PA |
8155 | printf_filtered (_("Cannot remove breakpoints because " |
8156 | "program is no longer writable.\nFurther " | |
8157 | "execution is probably impossible.\n")); | |
8158 | } | |
8159 | } | |
8160 | } | |
8161 | ||
4c2f2a79 PA |
8162 | /* The execution context that just caused a normal stop. */ |
8163 | ||
8164 | struct stop_context | |
8165 | { | |
2d844eaf TT |
8166 | stop_context (); |
8167 | ~stop_context (); | |
8168 | ||
8169 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8170 | ||
8171 | bool changed () const; | |
8172 | ||
4c2f2a79 PA |
8173 | /* The stop ID. */ |
8174 | ULONGEST stop_id; | |
c906108c | 8175 | |
4c2f2a79 | 8176 | /* The event PTID. */ |
c906108c | 8177 | |
4c2f2a79 PA |
8178 | ptid_t ptid; |
8179 | ||
8180 | /* If stopp for a thread event, this is the thread that caused the | |
8181 | stop. */ | |
8182 | struct thread_info *thread; | |
8183 | ||
8184 | /* The inferior that caused the stop. */ | |
8185 | int inf_num; | |
8186 | }; | |
8187 | ||
2d844eaf | 8188 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8189 | takes a strong reference to the thread. */ |
8190 | ||
2d844eaf | 8191 | stop_context::stop_context () |
4c2f2a79 | 8192 | { |
2d844eaf TT |
8193 | stop_id = get_stop_id (); |
8194 | ptid = inferior_ptid; | |
8195 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8196 | |
d7e15655 | 8197 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8198 | { |
8199 | /* Take a strong reference so that the thread can't be deleted | |
8200 | yet. */ | |
2d844eaf TT |
8201 | thread = inferior_thread (); |
8202 | thread->incref (); | |
4c2f2a79 PA |
8203 | } |
8204 | else | |
2d844eaf | 8205 | thread = NULL; |
4c2f2a79 PA |
8206 | } |
8207 | ||
8208 | /* Release a stop context previously created with save_stop_context. | |
8209 | Releases the strong reference to the thread as well. */ | |
8210 | ||
2d844eaf | 8211 | stop_context::~stop_context () |
4c2f2a79 | 8212 | { |
2d844eaf TT |
8213 | if (thread != NULL) |
8214 | thread->decref (); | |
4c2f2a79 PA |
8215 | } |
8216 | ||
8217 | /* Return true if the current context no longer matches the saved stop | |
8218 | context. */ | |
8219 | ||
2d844eaf TT |
8220 | bool |
8221 | stop_context::changed () const | |
8222 | { | |
8223 | if (ptid != inferior_ptid) | |
8224 | return true; | |
8225 | if (inf_num != current_inferior ()->num) | |
8226 | return true; | |
8227 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8228 | return true; | |
8229 | if (get_stop_id () != stop_id) | |
8230 | return true; | |
8231 | return false; | |
4c2f2a79 PA |
8232 | } |
8233 | ||
8234 | /* See infrun.h. */ | |
8235 | ||
8236 | int | |
96baa820 | 8237 | normal_stop (void) |
c906108c | 8238 | { |
73b65bb0 | 8239 | struct target_waitstatus last; |
73b65bb0 | 8240 | |
5b6d1e4f | 8241 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8242 | |
4c2f2a79 PA |
8243 | new_stop_id (); |
8244 | ||
29f49a6a PA |
8245 | /* If an exception is thrown from this point on, make sure to |
8246 | propagate GDB's knowledge of the executing state to the | |
8247 | frontend/user running state. A QUIT is an easy exception to see | |
8248 | here, so do this before any filtered output. */ | |
731f534f | 8249 | |
5b6d1e4f | 8250 | ptid_t finish_ptid = null_ptid; |
731f534f | 8251 | |
c35b1492 | 8252 | if (!non_stop) |
5b6d1e4f | 8253 | finish_ptid = minus_one_ptid; |
e1316e60 PA |
8254 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8255 | || last.kind == TARGET_WAITKIND_EXITED) | |
8256 | { | |
8257 | /* On some targets, we may still have live threads in the | |
8258 | inferior when we get a process exit event. E.g., for | |
8259 | "checkpoint", when the current checkpoint/fork exits, | |
8260 | linux-fork.c automatically switches to another fork from | |
8261 | within target_mourn_inferior. */ | |
731f534f | 8262 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8263 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 PA |
8264 | } |
8265 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5b6d1e4f PA |
8266 | finish_ptid = inferior_ptid; |
8267 | ||
8268 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8269 | if (finish_ptid != null_ptid) | |
8270 | { | |
8271 | maybe_finish_thread_state.emplace | |
8272 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8273 | } | |
29f49a6a | 8274 | |
b57bacec PA |
8275 | /* As we're presenting a stop, and potentially removing breakpoints, |
8276 | update the thread list so we can tell whether there are threads | |
8277 | running on the target. With target remote, for example, we can | |
8278 | only learn about new threads when we explicitly update the thread | |
8279 | list. Do this before notifying the interpreters about signal | |
8280 | stops, end of stepping ranges, etc., so that the "new thread" | |
8281 | output is emitted before e.g., "Program received signal FOO", | |
8282 | instead of after. */ | |
8283 | update_thread_list (); | |
8284 | ||
8285 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 8286 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 8287 | |
c906108c SS |
8288 | /* As with the notification of thread events, we want to delay |
8289 | notifying the user that we've switched thread context until | |
8290 | the inferior actually stops. | |
8291 | ||
73b65bb0 DJ |
8292 | There's no point in saying anything if the inferior has exited. |
8293 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8294 | "received a signal". |
8295 | ||
8296 | Also skip saying anything in non-stop mode. In that mode, as we | |
8297 | don't want GDB to switch threads behind the user's back, to avoid | |
8298 | races where the user is typing a command to apply to thread x, | |
8299 | but GDB switches to thread y before the user finishes entering | |
8300 | the command, fetch_inferior_event installs a cleanup to restore | |
8301 | the current thread back to the thread the user had selected right | |
8302 | after this event is handled, so we're not really switching, only | |
8303 | informing of a stop. */ | |
4f8d22e3 | 8304 | if (!non_stop |
731f534f | 8305 | && previous_inferior_ptid != inferior_ptid |
73b65bb0 DJ |
8306 | && target_has_execution |
8307 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8308 | && last.kind != TARGET_WAITKIND_EXITED |
8309 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8310 | { |
0e454242 | 8311 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8312 | { |
223ffa71 | 8313 | target_terminal::ours_for_output (); |
3b12939d | 8314 | printf_filtered (_("[Switching to %s]\n"), |
a068643d | 8315 | target_pid_to_str (inferior_ptid).c_str ()); |
3b12939d PA |
8316 | annotate_thread_changed (); |
8317 | } | |
39f77062 | 8318 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8319 | } |
c906108c | 8320 | |
0e5bf2a8 PA |
8321 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8322 | { | |
0e454242 | 8323 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8324 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8325 | { | |
223ffa71 | 8326 | target_terminal::ours_for_output (); |
3b12939d PA |
8327 | printf_filtered (_("No unwaited-for children left.\n")); |
8328 | } | |
0e5bf2a8 PA |
8329 | } |
8330 | ||
b57bacec | 8331 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8332 | maybe_remove_breakpoints (); |
c906108c | 8333 | |
c906108c SS |
8334 | /* If an auto-display called a function and that got a signal, |
8335 | delete that auto-display to avoid an infinite recursion. */ | |
8336 | ||
8337 | if (stopped_by_random_signal) | |
8338 | disable_current_display (); | |
8339 | ||
0e454242 | 8340 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8341 | { |
8342 | async_enable_stdin (); | |
8343 | } | |
c906108c | 8344 | |
388a7084 | 8345 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8346 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8347 | |
8348 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8349 | and current location is based on that. Handle the case where the | |
8350 | dummy call is returning after being stopped. E.g. the dummy call | |
8351 | previously hit a breakpoint. (If the dummy call returns | |
8352 | normally, we won't reach here.) Do this before the stop hook is | |
8353 | run, so that it doesn't get to see the temporary dummy frame, | |
8354 | which is not where we'll present the stop. */ | |
8355 | if (has_stack_frames ()) | |
8356 | { | |
8357 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8358 | { | |
8359 | /* Pop the empty frame that contains the stack dummy. This | |
8360 | also restores inferior state prior to the call (struct | |
8361 | infcall_suspend_state). */ | |
8362 | struct frame_info *frame = get_current_frame (); | |
8363 | ||
8364 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8365 | frame_pop (frame); | |
8366 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8367 | does which means there's now no selected frame. */ | |
8368 | } | |
8369 | ||
8370 | select_frame (get_current_frame ()); | |
8371 | ||
8372 | /* Set the current source location. */ | |
8373 | set_current_sal_from_frame (get_current_frame ()); | |
8374 | } | |
dd7e2d2b PA |
8375 | |
8376 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8377 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8378 | if (stop_command != NULL) |
8379 | { | |
2d844eaf | 8380 | stop_context saved_context; |
4c2f2a79 | 8381 | |
a70b8144 | 8382 | try |
bf469271 PA |
8383 | { |
8384 | execute_cmd_pre_hook (stop_command); | |
8385 | } | |
230d2906 | 8386 | catch (const gdb_exception &ex) |
bf469271 PA |
8387 | { |
8388 | exception_fprintf (gdb_stderr, ex, | |
8389 | "Error while running hook_stop:\n"); | |
8390 | } | |
4c2f2a79 PA |
8391 | |
8392 | /* If the stop hook resumes the target, then there's no point in | |
8393 | trying to notify about the previous stop; its context is | |
8394 | gone. Likewise if the command switches thread or inferior -- | |
8395 | the observers would print a stop for the wrong | |
8396 | thread/inferior. */ | |
2d844eaf TT |
8397 | if (saved_context.changed ()) |
8398 | return 1; | |
4c2f2a79 | 8399 | } |
dd7e2d2b | 8400 | |
388a7084 PA |
8401 | /* Notify observers about the stop. This is where the interpreters |
8402 | print the stop event. */ | |
d7e15655 | 8403 | if (inferior_ptid != null_ptid) |
76727919 | 8404 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
388a7084 PA |
8405 | stop_print_frame); |
8406 | else | |
76727919 | 8407 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8408 | |
243a9253 PA |
8409 | annotate_stopped (); |
8410 | ||
48844aa6 PA |
8411 | if (target_has_execution) |
8412 | { | |
8413 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
fe726667 PA |
8414 | && last.kind != TARGET_WAITKIND_EXITED |
8415 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8416 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8417 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8418 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8419 | } |
6c95b8df PA |
8420 | |
8421 | /* Try to get rid of automatically added inferiors that are no | |
8422 | longer needed. Keeping those around slows down things linearly. | |
8423 | Note that this never removes the current inferior. */ | |
8424 | prune_inferiors (); | |
4c2f2a79 PA |
8425 | |
8426 | return 0; | |
c906108c | 8427 | } |
c906108c | 8428 | \f |
c5aa993b | 8429 | int |
96baa820 | 8430 | signal_stop_state (int signo) |
c906108c | 8431 | { |
d6b48e9c | 8432 | return signal_stop[signo]; |
c906108c SS |
8433 | } |
8434 | ||
c5aa993b | 8435 | int |
96baa820 | 8436 | signal_print_state (int signo) |
c906108c SS |
8437 | { |
8438 | return signal_print[signo]; | |
8439 | } | |
8440 | ||
c5aa993b | 8441 | int |
96baa820 | 8442 | signal_pass_state (int signo) |
c906108c SS |
8443 | { |
8444 | return signal_program[signo]; | |
8445 | } | |
8446 | ||
2455069d UW |
8447 | static void |
8448 | signal_cache_update (int signo) | |
8449 | { | |
8450 | if (signo == -1) | |
8451 | { | |
a493e3e2 | 8452 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8453 | signal_cache_update (signo); |
8454 | ||
8455 | return; | |
8456 | } | |
8457 | ||
8458 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8459 | && signal_print[signo] == 0 | |
ab04a2af TT |
8460 | && signal_program[signo] == 1 |
8461 | && signal_catch[signo] == 0); | |
2455069d UW |
8462 | } |
8463 | ||
488f131b | 8464 | int |
7bda5e4a | 8465 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8466 | { |
8467 | int ret = signal_stop[signo]; | |
abbb1732 | 8468 | |
d4f3574e | 8469 | signal_stop[signo] = state; |
2455069d | 8470 | signal_cache_update (signo); |
d4f3574e SS |
8471 | return ret; |
8472 | } | |
8473 | ||
488f131b | 8474 | int |
7bda5e4a | 8475 | signal_print_update (int signo, int state) |
d4f3574e SS |
8476 | { |
8477 | int ret = signal_print[signo]; | |
abbb1732 | 8478 | |
d4f3574e | 8479 | signal_print[signo] = state; |
2455069d | 8480 | signal_cache_update (signo); |
d4f3574e SS |
8481 | return ret; |
8482 | } | |
8483 | ||
488f131b | 8484 | int |
7bda5e4a | 8485 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8486 | { |
8487 | int ret = signal_program[signo]; | |
abbb1732 | 8488 | |
d4f3574e | 8489 | signal_program[signo] = state; |
2455069d | 8490 | signal_cache_update (signo); |
d4f3574e SS |
8491 | return ret; |
8492 | } | |
8493 | ||
ab04a2af TT |
8494 | /* Update the global 'signal_catch' from INFO and notify the |
8495 | target. */ | |
8496 | ||
8497 | void | |
8498 | signal_catch_update (const unsigned int *info) | |
8499 | { | |
8500 | int i; | |
8501 | ||
8502 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8503 | signal_catch[i] = info[i] > 0; | |
8504 | signal_cache_update (-1); | |
adc6a863 | 8505 | target_pass_signals (signal_pass); |
ab04a2af TT |
8506 | } |
8507 | ||
c906108c | 8508 | static void |
96baa820 | 8509 | sig_print_header (void) |
c906108c | 8510 | { |
3e43a32a MS |
8511 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8512 | "to program\tDescription\n")); | |
c906108c SS |
8513 | } |
8514 | ||
8515 | static void | |
2ea28649 | 8516 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8517 | { |
2ea28649 | 8518 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8519 | int name_padding = 13 - strlen (name); |
96baa820 | 8520 | |
c906108c SS |
8521 | if (name_padding <= 0) |
8522 | name_padding = 0; | |
8523 | ||
8524 | printf_filtered ("%s", name); | |
488f131b | 8525 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8526 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8527 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8528 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8529 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8530 | } |
8531 | ||
8532 | /* Specify how various signals in the inferior should be handled. */ | |
8533 | ||
8534 | static void | |
0b39b52e | 8535 | handle_command (const char *args, int from_tty) |
c906108c | 8536 | { |
c906108c | 8537 | int digits, wordlen; |
b926417a | 8538 | int sigfirst, siglast; |
2ea28649 | 8539 | enum gdb_signal oursig; |
c906108c | 8540 | int allsigs; |
c906108c SS |
8541 | |
8542 | if (args == NULL) | |
8543 | { | |
e2e0b3e5 | 8544 | error_no_arg (_("signal to handle")); |
c906108c SS |
8545 | } |
8546 | ||
1777feb0 | 8547 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8548 | |
adc6a863 PA |
8549 | const size_t nsigs = GDB_SIGNAL_LAST; |
8550 | unsigned char sigs[nsigs] {}; | |
c906108c | 8551 | |
1777feb0 | 8552 | /* Break the command line up into args. */ |
c906108c | 8553 | |
773a1edc | 8554 | gdb_argv built_argv (args); |
c906108c SS |
8555 | |
8556 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8557 | actions. Signal numbers and signal names may be interspersed with | |
8558 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8559 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8560 | |
773a1edc | 8561 | for (char *arg : built_argv) |
c906108c | 8562 | { |
773a1edc TT |
8563 | wordlen = strlen (arg); |
8564 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8565 | {; |
8566 | } | |
8567 | allsigs = 0; | |
8568 | sigfirst = siglast = -1; | |
8569 | ||
773a1edc | 8570 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8571 | { |
8572 | /* Apply action to all signals except those used by the | |
1777feb0 | 8573 | debugger. Silently skip those. */ |
c906108c SS |
8574 | allsigs = 1; |
8575 | sigfirst = 0; | |
8576 | siglast = nsigs - 1; | |
8577 | } | |
773a1edc | 8578 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8579 | { |
8580 | SET_SIGS (nsigs, sigs, signal_stop); | |
8581 | SET_SIGS (nsigs, sigs, signal_print); | |
8582 | } | |
773a1edc | 8583 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8584 | { |
8585 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8586 | } | |
773a1edc | 8587 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8588 | { |
8589 | SET_SIGS (nsigs, sigs, signal_print); | |
8590 | } | |
773a1edc | 8591 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8592 | { |
8593 | SET_SIGS (nsigs, sigs, signal_program); | |
8594 | } | |
773a1edc | 8595 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8596 | { |
8597 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8598 | } | |
773a1edc | 8599 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8600 | { |
8601 | SET_SIGS (nsigs, sigs, signal_program); | |
8602 | } | |
773a1edc | 8603 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8604 | { |
8605 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8606 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8607 | } | |
773a1edc | 8608 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8609 | { |
8610 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8611 | } | |
8612 | else if (digits > 0) | |
8613 | { | |
8614 | /* It is numeric. The numeric signal refers to our own | |
8615 | internal signal numbering from target.h, not to host/target | |
8616 | signal number. This is a feature; users really should be | |
8617 | using symbolic names anyway, and the common ones like | |
8618 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8619 | ||
8620 | sigfirst = siglast = (int) | |
773a1edc TT |
8621 | gdb_signal_from_command (atoi (arg)); |
8622 | if (arg[digits] == '-') | |
c906108c SS |
8623 | { |
8624 | siglast = (int) | |
773a1edc | 8625 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8626 | } |
8627 | if (sigfirst > siglast) | |
8628 | { | |
1777feb0 | 8629 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8630 | std::swap (sigfirst, siglast); |
c906108c SS |
8631 | } |
8632 | } | |
8633 | else | |
8634 | { | |
773a1edc | 8635 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8636 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8637 | { |
8638 | sigfirst = siglast = (int) oursig; | |
8639 | } | |
8640 | else | |
8641 | { | |
8642 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8643 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8644 | } |
8645 | } | |
8646 | ||
8647 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8648 | which signals to apply actions to. */ |
c906108c | 8649 | |
b926417a | 8650 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8651 | { |
2ea28649 | 8652 | switch ((enum gdb_signal) signum) |
c906108c | 8653 | { |
a493e3e2 PA |
8654 | case GDB_SIGNAL_TRAP: |
8655 | case GDB_SIGNAL_INT: | |
c906108c SS |
8656 | if (!allsigs && !sigs[signum]) |
8657 | { | |
9e2f0ad4 | 8658 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8659 | Are you sure you want to change it? "), |
2ea28649 | 8660 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8661 | { |
8662 | sigs[signum] = 1; | |
8663 | } | |
8664 | else | |
c119e040 | 8665 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8666 | } |
8667 | break; | |
a493e3e2 PA |
8668 | case GDB_SIGNAL_0: |
8669 | case GDB_SIGNAL_DEFAULT: | |
8670 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8671 | /* Make sure that "all" doesn't print these. */ |
8672 | break; | |
8673 | default: | |
8674 | sigs[signum] = 1; | |
8675 | break; | |
8676 | } | |
8677 | } | |
c906108c SS |
8678 | } |
8679 | ||
b926417a | 8680 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8681 | if (sigs[signum]) |
8682 | { | |
2455069d | 8683 | signal_cache_update (-1); |
adc6a863 PA |
8684 | target_pass_signals (signal_pass); |
8685 | target_program_signals (signal_program); | |
c906108c | 8686 | |
3a031f65 PA |
8687 | if (from_tty) |
8688 | { | |
8689 | /* Show the results. */ | |
8690 | sig_print_header (); | |
8691 | for (; signum < nsigs; signum++) | |
8692 | if (sigs[signum]) | |
aead7601 | 8693 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8694 | } |
8695 | ||
8696 | break; | |
8697 | } | |
c906108c SS |
8698 | } |
8699 | ||
de0bea00 MF |
8700 | /* Complete the "handle" command. */ |
8701 | ||
eb3ff9a5 | 8702 | static void |
de0bea00 | 8703 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8704 | completion_tracker &tracker, |
6f937416 | 8705 | const char *text, const char *word) |
de0bea00 | 8706 | { |
de0bea00 MF |
8707 | static const char * const keywords[] = |
8708 | { | |
8709 | "all", | |
8710 | "stop", | |
8711 | "ignore", | |
8712 | "print", | |
8713 | "pass", | |
8714 | "nostop", | |
8715 | "noignore", | |
8716 | "noprint", | |
8717 | "nopass", | |
8718 | NULL, | |
8719 | }; | |
8720 | ||
eb3ff9a5 PA |
8721 | signal_completer (ignore, tracker, text, word); |
8722 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8723 | } |
8724 | ||
2ea28649 PA |
8725 | enum gdb_signal |
8726 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8727 | { |
8728 | if (num >= 1 && num <= 15) | |
2ea28649 | 8729 | return (enum gdb_signal) num; |
ed01b82c PA |
8730 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8731 | Use \"info signals\" for a list of symbolic signals.")); | |
8732 | } | |
8733 | ||
c906108c SS |
8734 | /* Print current contents of the tables set by the handle command. |
8735 | It is possible we should just be printing signals actually used | |
8736 | by the current target (but for things to work right when switching | |
8737 | targets, all signals should be in the signal tables). */ | |
8738 | ||
8739 | static void | |
1d12d88f | 8740 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8741 | { |
2ea28649 | 8742 | enum gdb_signal oursig; |
abbb1732 | 8743 | |
c906108c SS |
8744 | sig_print_header (); |
8745 | ||
8746 | if (signum_exp) | |
8747 | { | |
8748 | /* First see if this is a symbol name. */ | |
2ea28649 | 8749 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8750 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8751 | { |
8752 | /* No, try numeric. */ | |
8753 | oursig = | |
2ea28649 | 8754 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8755 | } |
8756 | sig_print_info (oursig); | |
8757 | return; | |
8758 | } | |
8759 | ||
8760 | printf_filtered ("\n"); | |
8761 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8762 | for (oursig = GDB_SIGNAL_FIRST; |
8763 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8764 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8765 | { |
8766 | QUIT; | |
8767 | ||
a493e3e2 PA |
8768 | if (oursig != GDB_SIGNAL_UNKNOWN |
8769 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8770 | sig_print_info (oursig); |
8771 | } | |
8772 | ||
3e43a32a MS |
8773 | printf_filtered (_("\nUse the \"handle\" command " |
8774 | "to change these tables.\n")); | |
c906108c | 8775 | } |
4aa995e1 PA |
8776 | |
8777 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8778 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8779 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8780 | also dependent on which thread you have selected. |
8781 | ||
8782 | 1. making $_siginfo be an internalvar that creates a new value on | |
8783 | access. | |
8784 | ||
8785 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8786 | ||
8787 | /* This function implements the lval_computed support for reading a | |
8788 | $_siginfo value. */ | |
8789 | ||
8790 | static void | |
8791 | siginfo_value_read (struct value *v) | |
8792 | { | |
8793 | LONGEST transferred; | |
8794 | ||
a911d87a PA |
8795 | /* If we can access registers, so can we access $_siginfo. Likewise |
8796 | vice versa. */ | |
8797 | validate_registers_access (); | |
c709acd1 | 8798 | |
4aa995e1 | 8799 | transferred = |
8b88a78e | 8800 | target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, |
4aa995e1 PA |
8801 | NULL, |
8802 | value_contents_all_raw (v), | |
8803 | value_offset (v), | |
8804 | TYPE_LENGTH (value_type (v))); | |
8805 | ||
8806 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8807 | error (_("Unable to read siginfo")); | |
8808 | } | |
8809 | ||
8810 | /* This function implements the lval_computed support for writing a | |
8811 | $_siginfo value. */ | |
8812 | ||
8813 | static void | |
8814 | siginfo_value_write (struct value *v, struct value *fromval) | |
8815 | { | |
8816 | LONGEST transferred; | |
8817 | ||
a911d87a PA |
8818 | /* If we can access registers, so can we access $_siginfo. Likewise |
8819 | vice versa. */ | |
8820 | validate_registers_access (); | |
c709acd1 | 8821 | |
8b88a78e | 8822 | transferred = target_write (current_top_target (), |
4aa995e1 PA |
8823 | TARGET_OBJECT_SIGNAL_INFO, |
8824 | NULL, | |
8825 | value_contents_all_raw (fromval), | |
8826 | value_offset (v), | |
8827 | TYPE_LENGTH (value_type (fromval))); | |
8828 | ||
8829 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8830 | error (_("Unable to write siginfo")); | |
8831 | } | |
8832 | ||
c8f2448a | 8833 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8834 | { |
8835 | siginfo_value_read, | |
8836 | siginfo_value_write | |
8837 | }; | |
8838 | ||
8839 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8840 | the current thread using architecture GDBARCH. Return a void value |
8841 | if there's no object available. */ | |
4aa995e1 | 8842 | |
2c0b251b | 8843 | static struct value * |
22d2b532 SDJ |
8844 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8845 | void *ignore) | |
4aa995e1 | 8846 | { |
4aa995e1 | 8847 | if (target_has_stack |
d7e15655 | 8848 | && inferior_ptid != null_ptid |
78267919 | 8849 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 8850 | { |
78267919 | 8851 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8852 | |
78267919 | 8853 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8854 | } |
8855 | ||
78267919 | 8856 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8857 | } |
8858 | ||
c906108c | 8859 | \f |
16c381f0 JK |
8860 | /* infcall_suspend_state contains state about the program itself like its |
8861 | registers and any signal it received when it last stopped. | |
8862 | This state must be restored regardless of how the inferior function call | |
8863 | ends (either successfully, or after it hits a breakpoint or signal) | |
8864 | if the program is to properly continue where it left off. */ | |
8865 | ||
6bf78e29 | 8866 | class infcall_suspend_state |
7a292a7a | 8867 | { |
6bf78e29 AB |
8868 | public: |
8869 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
8870 | once the inferior function call has finished. */ | |
8871 | infcall_suspend_state (struct gdbarch *gdbarch, | |
8872 | const struct thread_info *tp, | |
8873 | struct regcache *regcache) | |
8874 | : m_thread_suspend (tp->suspend), | |
8875 | m_registers (new readonly_detached_regcache (*regcache)) | |
8876 | { | |
8877 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
8878 | ||
8879 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8880 | { | |
8881 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8882 | size_t len = TYPE_LENGTH (type); | |
8883 | ||
8884 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); | |
8885 | ||
8886 | if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8887 | siginfo_data.get (), 0, len) != len) | |
8888 | { | |
8889 | /* Errors ignored. */ | |
8890 | siginfo_data.reset (nullptr); | |
8891 | } | |
8892 | } | |
8893 | ||
8894 | if (siginfo_data) | |
8895 | { | |
8896 | m_siginfo_gdbarch = gdbarch; | |
8897 | m_siginfo_data = std::move (siginfo_data); | |
8898 | } | |
8899 | } | |
8900 | ||
8901 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 8902 | |
6bf78e29 AB |
8903 | readonly_detached_regcache *registers () const |
8904 | { | |
8905 | return m_registers.get (); | |
8906 | } | |
8907 | ||
8908 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
8909 | ||
8910 | void restore (struct gdbarch *gdbarch, | |
8911 | struct thread_info *tp, | |
8912 | struct regcache *regcache) const | |
8913 | { | |
8914 | tp->suspend = m_thread_suspend; | |
8915 | ||
8916 | if (m_siginfo_gdbarch == gdbarch) | |
8917 | { | |
8918 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8919 | ||
8920 | /* Errors ignored. */ | |
8921 | target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8922 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); | |
8923 | } | |
8924 | ||
8925 | /* The inferior can be gone if the user types "print exit(0)" | |
8926 | (and perhaps other times). */ | |
8927 | if (target_has_execution) | |
8928 | /* NB: The register write goes through to the target. */ | |
8929 | regcache->restore (registers ()); | |
8930 | } | |
8931 | ||
8932 | private: | |
8933 | /* How the current thread stopped before the inferior function call was | |
8934 | executed. */ | |
8935 | struct thread_suspend_state m_thread_suspend; | |
8936 | ||
8937 | /* The registers before the inferior function call was executed. */ | |
8938 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 8939 | |
35515841 | 8940 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 8941 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
8942 | |
8943 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8944 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8945 | content would be invalid. */ | |
6bf78e29 | 8946 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
8947 | }; |
8948 | ||
cb524840 TT |
8949 | infcall_suspend_state_up |
8950 | save_infcall_suspend_state () | |
b89667eb | 8951 | { |
b89667eb | 8952 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 8953 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8954 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 8955 | |
6bf78e29 AB |
8956 | infcall_suspend_state_up inf_state |
8957 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 8958 | |
6bf78e29 AB |
8959 | /* Having saved the current state, adjust the thread state, discarding |
8960 | any stop signal information. The stop signal is not useful when | |
8961 | starting an inferior function call, and run_inferior_call will not use | |
8962 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 8963 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 8964 | |
b89667eb DE |
8965 | return inf_state; |
8966 | } | |
8967 | ||
8968 | /* Restore inferior session state to INF_STATE. */ | |
8969 | ||
8970 | void | |
16c381f0 | 8971 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8972 | { |
8973 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 8974 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8975 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 8976 | |
6bf78e29 | 8977 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 8978 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8979 | } |
8980 | ||
b89667eb | 8981 | void |
16c381f0 | 8982 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 8983 | { |
dd848631 | 8984 | delete inf_state; |
b89667eb DE |
8985 | } |
8986 | ||
daf6667d | 8987 | readonly_detached_regcache * |
16c381f0 | 8988 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 8989 | { |
6bf78e29 | 8990 | return inf_state->registers (); |
b89667eb DE |
8991 | } |
8992 | ||
16c381f0 JK |
8993 | /* infcall_control_state contains state regarding gdb's control of the |
8994 | inferior itself like stepping control. It also contains session state like | |
8995 | the user's currently selected frame. */ | |
b89667eb | 8996 | |
16c381f0 | 8997 | struct infcall_control_state |
b89667eb | 8998 | { |
16c381f0 JK |
8999 | struct thread_control_state thread_control; |
9000 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
9001 | |
9002 | /* Other fields: */ | |
ee841dd8 TT |
9003 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
9004 | int stopped_by_random_signal = 0; | |
7a292a7a | 9005 | |
b89667eb | 9006 | /* ID if the selected frame when the inferior function call was made. */ |
ee841dd8 | 9007 | struct frame_id selected_frame_id {}; |
7a292a7a SS |
9008 | }; |
9009 | ||
c906108c | 9010 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9011 | connection. */ |
c906108c | 9012 | |
cb524840 TT |
9013 | infcall_control_state_up |
9014 | save_infcall_control_state () | |
c906108c | 9015 | { |
cb524840 | 9016 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9017 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9018 | struct inferior *inf = current_inferior (); |
7a292a7a | 9019 | |
16c381f0 JK |
9020 | inf_status->thread_control = tp->control; |
9021 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9022 | |
8358c15c | 9023 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9024 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9025 | |
16c381f0 JK |
9026 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9027 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9028 | hand them back the original chain when restore_infcall_control_state is | |
9029 | called. */ | |
9030 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9031 | |
9032 | /* Other fields: */ | |
9033 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9034 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9035 | |
206415a3 | 9036 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 9037 | |
7a292a7a | 9038 | return inf_status; |
c906108c SS |
9039 | } |
9040 | ||
bf469271 PA |
9041 | static void |
9042 | restore_selected_frame (const frame_id &fid) | |
c906108c | 9043 | { |
bf469271 | 9044 | frame_info *frame = frame_find_by_id (fid); |
c906108c | 9045 | |
aa0cd9c1 AC |
9046 | /* If inf_status->selected_frame_id is NULL, there was no previously |
9047 | selected frame. */ | |
101dcfbe | 9048 | if (frame == NULL) |
c906108c | 9049 | { |
8a3fe4f8 | 9050 | warning (_("Unable to restore previously selected frame.")); |
bf469271 | 9051 | return; |
c906108c SS |
9052 | } |
9053 | ||
0f7d239c | 9054 | select_frame (frame); |
c906108c SS |
9055 | } |
9056 | ||
b89667eb DE |
9057 | /* Restore inferior session state to INF_STATUS. */ |
9058 | ||
c906108c | 9059 | void |
16c381f0 | 9060 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9061 | { |
4e1c45ea | 9062 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9063 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9064 | |
8358c15c JK |
9065 | if (tp->control.step_resume_breakpoint) |
9066 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9067 | ||
5b79abe7 TT |
9068 | if (tp->control.exception_resume_breakpoint) |
9069 | tp->control.exception_resume_breakpoint->disposition | |
9070 | = disp_del_at_next_stop; | |
9071 | ||
d82142e2 | 9072 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9073 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9074 | |
16c381f0 JK |
9075 | tp->control = inf_status->thread_control; |
9076 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9077 | |
9078 | /* Other fields: */ | |
9079 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9080 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9081 | |
b89667eb | 9082 | if (target_has_stack) |
c906108c | 9083 | { |
bf469271 | 9084 | /* The point of the try/catch is that if the stack is clobbered, |
101dcfbe AC |
9085 | walking the stack might encounter a garbage pointer and |
9086 | error() trying to dereference it. */ | |
a70b8144 | 9087 | try |
bf469271 PA |
9088 | { |
9089 | restore_selected_frame (inf_status->selected_frame_id); | |
9090 | } | |
230d2906 | 9091 | catch (const gdb_exception_error &ex) |
bf469271 PA |
9092 | { |
9093 | exception_fprintf (gdb_stderr, ex, | |
9094 | "Unable to restore previously selected frame:\n"); | |
9095 | /* Error in restoring the selected frame. Select the | |
9096 | innermost frame. */ | |
9097 | select_frame (get_current_frame ()); | |
9098 | } | |
c906108c | 9099 | } |
c906108c | 9100 | |
ee841dd8 | 9101 | delete inf_status; |
7a292a7a | 9102 | } |
c906108c SS |
9103 | |
9104 | void | |
16c381f0 | 9105 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9106 | { |
8358c15c JK |
9107 | if (inf_status->thread_control.step_resume_breakpoint) |
9108 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9109 | = disp_del_at_next_stop; | |
9110 | ||
5b79abe7 TT |
9111 | if (inf_status->thread_control.exception_resume_breakpoint) |
9112 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9113 | = disp_del_at_next_stop; | |
9114 | ||
1777feb0 | 9115 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9116 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9117 | |
ee841dd8 | 9118 | delete inf_status; |
7a292a7a | 9119 | } |
b89667eb | 9120 | \f |
7f89fd65 | 9121 | /* See infrun.h. */ |
0c557179 SDJ |
9122 | |
9123 | void | |
9124 | clear_exit_convenience_vars (void) | |
9125 | { | |
9126 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9127 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9128 | } | |
c5aa993b | 9129 | \f |
488f131b | 9130 | |
b2175913 MS |
9131 | /* User interface for reverse debugging: |
9132 | Set exec-direction / show exec-direction commands | |
9133 | (returns error unless target implements to_set_exec_direction method). */ | |
9134 | ||
170742de | 9135 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9136 | static const char exec_forward[] = "forward"; |
9137 | static const char exec_reverse[] = "reverse"; | |
9138 | static const char *exec_direction = exec_forward; | |
40478521 | 9139 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9140 | exec_forward, |
9141 | exec_reverse, | |
9142 | NULL | |
9143 | }; | |
9144 | ||
9145 | static void | |
eb4c3f4a | 9146 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9147 | struct cmd_list_element *cmd) |
9148 | { | |
9149 | if (target_can_execute_reverse) | |
9150 | { | |
9151 | if (!strcmp (exec_direction, exec_forward)) | |
9152 | execution_direction = EXEC_FORWARD; | |
9153 | else if (!strcmp (exec_direction, exec_reverse)) | |
9154 | execution_direction = EXEC_REVERSE; | |
9155 | } | |
8bbed405 MS |
9156 | else |
9157 | { | |
9158 | exec_direction = exec_forward; | |
9159 | error (_("Target does not support this operation.")); | |
9160 | } | |
b2175913 MS |
9161 | } |
9162 | ||
9163 | static void | |
9164 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9165 | struct cmd_list_element *cmd, const char *value) | |
9166 | { | |
9167 | switch (execution_direction) { | |
9168 | case EXEC_FORWARD: | |
9169 | fprintf_filtered (out, _("Forward.\n")); | |
9170 | break; | |
9171 | case EXEC_REVERSE: | |
9172 | fprintf_filtered (out, _("Reverse.\n")); | |
9173 | break; | |
b2175913 | 9174 | default: |
d8b34453 PA |
9175 | internal_error (__FILE__, __LINE__, |
9176 | _("bogus execution_direction value: %d"), | |
9177 | (int) execution_direction); | |
b2175913 MS |
9178 | } |
9179 | } | |
9180 | ||
d4db2f36 PA |
9181 | static void |
9182 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9183 | struct cmd_list_element *c, const char *value) | |
9184 | { | |
3e43a32a MS |
9185 | fprintf_filtered (file, _("Resuming the execution of threads " |
9186 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9187 | } |
ad52ddc6 | 9188 | |
22d2b532 SDJ |
9189 | /* Implementation of `siginfo' variable. */ |
9190 | ||
9191 | static const struct internalvar_funcs siginfo_funcs = | |
9192 | { | |
9193 | siginfo_make_value, | |
9194 | NULL, | |
9195 | NULL | |
9196 | }; | |
9197 | ||
372316f1 PA |
9198 | /* Callback for infrun's target events source. This is marked when a |
9199 | thread has a pending status to process. */ | |
9200 | ||
9201 | static void | |
9202 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9203 | { | |
372316f1 PA |
9204 | inferior_event_handler (INF_REG_EVENT, NULL); |
9205 | } | |
9206 | ||
6c265988 | 9207 | void _initialize_infrun (); |
c906108c | 9208 | void |
6c265988 | 9209 | _initialize_infrun () |
c906108c | 9210 | { |
de0bea00 | 9211 | struct cmd_list_element *c; |
c906108c | 9212 | |
372316f1 PA |
9213 | /* Register extra event sources in the event loop. */ |
9214 | infrun_async_inferior_event_token | |
9215 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
9216 | ||
11db9430 | 9217 | add_info ("signals", info_signals_command, _("\ |
1bedd215 AC |
9218 | What debugger does when program gets various signals.\n\ |
9219 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9220 | add_info_alias ("handle", "signals", 0); |
9221 | ||
de0bea00 | 9222 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9223 | Specify how to handle signals.\n\ |
486c7739 | 9224 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9225 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9226 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9227 | will be displayed instead.\n\ |
9228 | \n\ | |
c906108c SS |
9229 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9230 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9231 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9232 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9233 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9234 | \n\ |
1bedd215 | 9235 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9236 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9237 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9238 | Print means print a message if this signal happens.\n\ | |
9239 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9240 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9241 | Pass and Stop may be combined.\n\ |
9242 | \n\ | |
9243 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9244 | may be interspersed with actions, with the actions being performed for\n\ | |
9245 | all signals cumulatively specified.")); | |
de0bea00 | 9246 | set_cmd_completer (c, handle_completer); |
486c7739 | 9247 | |
c906108c | 9248 | if (!dbx_commands) |
1a966eab AC |
9249 | stop_command = add_cmd ("stop", class_obscure, |
9250 | not_just_help_class_command, _("\ | |
9251 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9252 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9253 | of the program stops."), &cmdlist); |
c906108c | 9254 | |
ccce17b0 | 9255 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9256 | Set inferior debugging."), _("\ |
9257 | Show inferior debugging."), _("\ | |
9258 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9259 | NULL, |
9260 | show_debug_infrun, | |
9261 | &setdebuglist, &showdebuglist); | |
527159b7 | 9262 | |
3e43a32a MS |
9263 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9264 | &debug_displaced, _("\ | |
237fc4c9 PA |
9265 | Set displaced stepping debugging."), _("\ |
9266 | Show displaced stepping debugging."), _("\ | |
9267 | When non-zero, displaced stepping specific debugging is enabled."), | |
9268 | NULL, | |
9269 | show_debug_displaced, | |
9270 | &setdebuglist, &showdebuglist); | |
9271 | ||
ad52ddc6 PA |
9272 | add_setshow_boolean_cmd ("non-stop", no_class, |
9273 | &non_stop_1, _("\ | |
9274 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9275 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9276 | When debugging a multi-threaded program and this setting is\n\ | |
9277 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9278 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9279 | all other threads in the program while you interact with the thread of\n\ | |
9280 | interest. When you continue or step a thread, you can allow the other\n\ | |
9281 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9282 | thread's state, all threads stop.\n\ | |
9283 | \n\ | |
9284 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9285 | to run freely. You'll be able to step each thread independently,\n\ | |
9286 | leave it stopped or free to run as needed."), | |
9287 | set_non_stop, | |
9288 | show_non_stop, | |
9289 | &setlist, | |
9290 | &showlist); | |
9291 | ||
adc6a863 | 9292 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9293 | { |
9294 | signal_stop[i] = 1; | |
9295 | signal_print[i] = 1; | |
9296 | signal_program[i] = 1; | |
ab04a2af | 9297 | signal_catch[i] = 0; |
c906108c SS |
9298 | } |
9299 | ||
4d9d9d04 PA |
9300 | /* Signals caused by debugger's own actions should not be given to |
9301 | the program afterwards. | |
9302 | ||
9303 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9304 | explicitly specifies that it should be delivered to the target | |
9305 | program. Typically, that would occur when a user is debugging a | |
9306 | target monitor on a simulator: the target monitor sets a | |
9307 | breakpoint; the simulator encounters this breakpoint and halts | |
9308 | the simulation handing control to GDB; GDB, noting that the stop | |
9309 | address doesn't map to any known breakpoint, returns control back | |
9310 | to the simulator; the simulator then delivers the hardware | |
9311 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9312 | debugged. */ | |
a493e3e2 PA |
9313 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9314 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9315 | |
9316 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9317 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9318 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9319 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9320 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9321 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9322 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9323 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9324 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9325 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9326 | signal_print[GDB_SIGNAL_IO] = 0; | |
9327 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9328 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9329 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9330 | signal_print[GDB_SIGNAL_URG] = 0; | |
9331 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9332 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9333 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9334 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9335 | |
cd0fc7c3 SS |
9336 | /* These signals are used internally by user-level thread |
9337 | implementations. (See signal(5) on Solaris.) Like the above | |
9338 | signals, a healthy program receives and handles them as part of | |
9339 | its normal operation. */ | |
a493e3e2 PA |
9340 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9341 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9342 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9343 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9344 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9345 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9346 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9347 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9348 | |
2455069d UW |
9349 | /* Update cached state. */ |
9350 | signal_cache_update (-1); | |
9351 | ||
85c07804 AC |
9352 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9353 | &stop_on_solib_events, _("\ | |
9354 | Set stopping for shared library events."), _("\ | |
9355 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9356 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9357 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9358 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9359 | set_stop_on_solib_events, |
920d2a44 | 9360 | show_stop_on_solib_events, |
85c07804 | 9361 | &setlist, &showlist); |
c906108c | 9362 | |
7ab04401 AC |
9363 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9364 | follow_fork_mode_kind_names, | |
9365 | &follow_fork_mode_string, _("\ | |
9366 | Set debugger response to a program call of fork or vfork."), _("\ | |
9367 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9368 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9369 | parent - the original process is debugged after a fork\n\ | |
9370 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9371 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9372 | By default, the debugger will follow the parent process."), |
9373 | NULL, | |
920d2a44 | 9374 | show_follow_fork_mode_string, |
7ab04401 AC |
9375 | &setlist, &showlist); |
9376 | ||
6c95b8df PA |
9377 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9378 | follow_exec_mode_names, | |
9379 | &follow_exec_mode_string, _("\ | |
9380 | Set debugger response to a program call of exec."), _("\ | |
9381 | Show debugger response to a program call of exec."), _("\ | |
9382 | An exec call replaces the program image of a process.\n\ | |
9383 | \n\ | |
9384 | follow-exec-mode can be:\n\ | |
9385 | \n\ | |
cce7e648 | 9386 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9387 | to this new inferior. The program the process was running before\n\ |
9388 | the exec call can be restarted afterwards by restarting the original\n\ | |
9389 | inferior.\n\ | |
9390 | \n\ | |
9391 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9392 | The new executable image replaces the previous executable loaded in\n\ | |
9393 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9394 | the executable the process was running after the exec call.\n\ | |
9395 | \n\ | |
9396 | By default, the debugger will use the same inferior."), | |
9397 | NULL, | |
9398 | show_follow_exec_mode_string, | |
9399 | &setlist, &showlist); | |
9400 | ||
7ab04401 AC |
9401 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9402 | scheduler_enums, &scheduler_mode, _("\ | |
9403 | Set mode for locking scheduler during execution."), _("\ | |
9404 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9405 | off == no locking (threads may preempt at any time)\n\ |
9406 | on == full locking (no thread except the current thread may run)\n\ | |
9407 | This applies to both normal execution and replay mode.\n\ | |
9408 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9409 | In this mode, other threads may run during other commands.\n\ | |
9410 | This applies to both normal execution and replay mode.\n\ | |
9411 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9412 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9413 | show_scheduler_mode, |
7ab04401 | 9414 | &setlist, &showlist); |
5fbbeb29 | 9415 | |
d4db2f36 PA |
9416 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9417 | Set mode for resuming threads of all processes."), _("\ | |
9418 | Show mode for resuming threads of all processes."), _("\ | |
9419 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9420 | threads of all processes. When off (which is the default), execution\n\ | |
9421 | commands only resume the threads of the current process. The set of\n\ | |
9422 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9423 | mode (see help set scheduler-locking)."), | |
9424 | NULL, | |
9425 | show_schedule_multiple, | |
9426 | &setlist, &showlist); | |
9427 | ||
5bf193a2 AC |
9428 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9429 | Set mode of the step operation."), _("\ | |
9430 | Show mode of the step operation."), _("\ | |
9431 | When set, doing a step over a function without debug line information\n\ | |
9432 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9433 | function is skipped and the step command stops at a different source line."), | |
9434 | NULL, | |
920d2a44 | 9435 | show_step_stop_if_no_debug, |
5bf193a2 | 9436 | &setlist, &showlist); |
ca6724c1 | 9437 | |
72d0e2c5 YQ |
9438 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9439 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9440 | Set debugger's willingness to use displaced stepping."), _("\ |
9441 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9442 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9443 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9444 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9445 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9446 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9447 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9448 | NULL, |
9449 | show_can_use_displaced_stepping, | |
9450 | &setlist, &showlist); | |
237fc4c9 | 9451 | |
b2175913 MS |
9452 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9453 | &exec_direction, _("Set direction of execution.\n\ | |
9454 | Options are 'forward' or 'reverse'."), | |
9455 | _("Show direction of execution (forward/reverse)."), | |
9456 | _("Tells gdb whether to execute forward or backward."), | |
9457 | set_exec_direction_func, show_exec_direction_func, | |
9458 | &setlist, &showlist); | |
9459 | ||
6c95b8df PA |
9460 | /* Set/show detach-on-fork: user-settable mode. */ |
9461 | ||
9462 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9463 | Set whether gdb will detach the child of a fork."), _("\ | |
9464 | Show whether gdb will detach the child of a fork."), _("\ | |
9465 | Tells gdb whether to detach the child of a fork."), | |
9466 | NULL, NULL, &setlist, &showlist); | |
9467 | ||
03583c20 UW |
9468 | /* Set/show disable address space randomization mode. */ |
9469 | ||
9470 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9471 | &disable_randomization, _("\ | |
9472 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9473 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9474 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9475 | address space is disabled. Standalone programs run with the randomization\n\ | |
9476 | enabled by default on some platforms."), | |
9477 | &set_disable_randomization, | |
9478 | &show_disable_randomization, | |
9479 | &setlist, &showlist); | |
9480 | ||
ca6724c1 | 9481 | /* ptid initializations */ |
ca6724c1 KB |
9482 | inferior_ptid = null_ptid; |
9483 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9484 | |
76727919 TT |
9485 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed); |
9486 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested); | |
9487 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit); | |
9488 | gdb::observers::inferior_exit.attach (infrun_inferior_exit); | |
4aa995e1 PA |
9489 | |
9490 | /* Explicitly create without lookup, since that tries to create a | |
9491 | value with a void typed value, and when we get here, gdbarch | |
9492 | isn't initialized yet. At this point, we're quite sure there | |
9493 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9494 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9495 | |
9496 | add_setshow_boolean_cmd ("observer", no_class, | |
9497 | &observer_mode_1, _("\ | |
9498 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9499 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9500 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9501 | affect its execution. Registers and memory may not be changed,\n\ | |
9502 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9503 | or signalled."), | |
9504 | set_observer_mode, | |
9505 | show_observer_mode, | |
9506 | &setlist, | |
9507 | &showlist); | |
c906108c | 9508 | } |