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" | |
e088209c | 22 | #include "displaced-stepping.h" |
4100594e SM |
23 | #include "gdbsupport/common-defs.h" |
24 | #include "gdbsupport/common-utils.h" | |
45741a9c | 25 | #include "infrun.h" |
c906108c SS |
26 | #include <ctype.h> |
27 | #include "symtab.h" | |
28 | #include "frame.h" | |
29 | #include "inferior.h" | |
30 | #include "breakpoint.h" | |
c906108c SS |
31 | #include "gdbcore.h" |
32 | #include "gdbcmd.h" | |
33 | #include "target.h" | |
2f4fcf00 | 34 | #include "target-connection.h" |
c906108c SS |
35 | #include "gdbthread.h" |
36 | #include "annotate.h" | |
1adeb98a | 37 | #include "symfile.h" |
7a292a7a | 38 | #include "top.h" |
2acceee2 | 39 | #include "inf-loop.h" |
4e052eda | 40 | #include "regcache.h" |
e088209c | 41 | #include "utils.h" |
fd0407d6 | 42 | #include "value.h" |
76727919 | 43 | #include "observable.h" |
f636b87d | 44 | #include "language.h" |
a77053c2 | 45 | #include "solib.h" |
f17517ea | 46 | #include "main.h" |
186c406b | 47 | #include "block.h" |
034dad6f | 48 | #include "mi/mi-common.h" |
4f8d22e3 | 49 | #include "event-top.h" |
96429cc8 | 50 | #include "record.h" |
d02ed0bb | 51 | #include "record-full.h" |
edb3359d | 52 | #include "inline-frame.h" |
4efc6507 | 53 | #include "jit.h" |
06cd862c | 54 | #include "tracepoint.h" |
1bfeeb0f | 55 | #include "skip.h" |
28106bc2 SDJ |
56 | #include "probe.h" |
57 | #include "objfiles.h" | |
de0bea00 | 58 | #include "completer.h" |
9107fc8d | 59 | #include "target-descriptions.h" |
f15cb84a | 60 | #include "target-dcache.h" |
d83ad864 | 61 | #include "terminal.h" |
ff862be4 | 62 | #include "solist.h" |
400b5eca | 63 | #include "gdbsupport/event-loop.h" |
243a9253 | 64 | #include "thread-fsm.h" |
268a13a5 | 65 | #include "gdbsupport/enum-flags.h" |
5ed8105e | 66 | #include "progspace-and-thread.h" |
268a13a5 | 67 | #include "gdbsupport/gdb_optional.h" |
46a62268 | 68 | #include "arch-utils.h" |
268a13a5 TT |
69 | #include "gdbsupport/scope-exit.h" |
70 | #include "gdbsupport/forward-scope-exit.h" | |
06cc9596 | 71 | #include "gdbsupport/gdb_select.h" |
5b6d1e4f | 72 | #include <unordered_map> |
93b54c8e | 73 | #include "async-event.h" |
c906108c SS |
74 | |
75 | /* Prototypes for local functions */ | |
76 | ||
2ea28649 | 77 | static void sig_print_info (enum gdb_signal); |
c906108c | 78 | |
96baa820 | 79 | static void sig_print_header (void); |
c906108c | 80 | |
d83ad864 DB |
81 | static void follow_inferior_reset_breakpoints (void); |
82 | ||
a289b8f6 JK |
83 | static int currently_stepping (struct thread_info *tp); |
84 | ||
2c03e5be | 85 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
86 | |
87 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
88 | ||
2484c66b UW |
89 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
90 | ||
8550d3b3 YQ |
91 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
92 | ||
aff4e175 AB |
93 | static void resume (gdb_signal sig); |
94 | ||
5b6d1e4f PA |
95 | static void wait_for_inferior (inferior *inf); |
96 | ||
372316f1 PA |
97 | /* Asynchronous signal handler registered as event loop source for |
98 | when we have pending events ready to be passed to the core. */ | |
99 | static struct async_event_handler *infrun_async_inferior_event_token; | |
100 | ||
101 | /* Stores whether infrun_async was previously enabled or disabled. | |
102 | Starts off as -1, indicating "never enabled/disabled". */ | |
103 | static int infrun_is_async = -1; | |
104 | ||
4100594e SM |
105 | #define infrun_log_debug(fmt, args...) \ |
106 | infrun_log_debug_1 (__LINE__, __func__, fmt, ##args) | |
107 | ||
108 | static void ATTRIBUTE_PRINTF(3, 4) | |
109 | infrun_log_debug_1 (int line, const char *func, | |
110 | const char *fmt, ...) | |
111 | { | |
112 | if (debug_infrun) | |
113 | { | |
114 | va_list args; | |
115 | va_start (args, fmt); | |
116 | std::string msg = string_vprintf (fmt, args); | |
117 | va_end (args); | |
118 | ||
119 | fprintf_unfiltered (gdb_stdout, "infrun: %s: %s\n", func, msg.c_str ()); | |
120 | } | |
121 | } | |
122 | ||
372316f1 PA |
123 | /* See infrun.h. */ |
124 | ||
125 | void | |
126 | infrun_async (int enable) | |
127 | { | |
128 | if (infrun_is_async != enable) | |
129 | { | |
130 | infrun_is_async = enable; | |
131 | ||
4100594e | 132 | infrun_log_debug ("enable=%d", enable); |
372316f1 PA |
133 | |
134 | if (enable) | |
135 | mark_async_event_handler (infrun_async_inferior_event_token); | |
136 | else | |
137 | clear_async_event_handler (infrun_async_inferior_event_token); | |
138 | } | |
139 | } | |
140 | ||
0b333c5e PA |
141 | /* See infrun.h. */ |
142 | ||
143 | void | |
144 | mark_infrun_async_event_handler (void) | |
145 | { | |
146 | mark_async_event_handler (infrun_async_inferior_event_token); | |
147 | } | |
148 | ||
5fbbeb29 CF |
149 | /* When set, stop the 'step' command if we enter a function which has |
150 | no line number information. The normal behavior is that we step | |
151 | over such function. */ | |
491144b5 | 152 | bool step_stop_if_no_debug = false; |
920d2a44 AC |
153 | static void |
154 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
155 | struct cmd_list_element *c, const char *value) | |
156 | { | |
157 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
158 | } | |
5fbbeb29 | 159 | |
b9f437de PA |
160 | /* proceed and normal_stop use this to notify the user when the |
161 | inferior stopped in a different thread than it had been running | |
162 | in. */ | |
96baa820 | 163 | |
39f77062 | 164 | static ptid_t previous_inferior_ptid; |
7a292a7a | 165 | |
07107ca6 LM |
166 | /* If set (default for legacy reasons), when following a fork, GDB |
167 | will detach from one of the fork branches, child or parent. | |
168 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
169 | setting. */ | |
170 | ||
491144b5 | 171 | static bool detach_fork = true; |
6c95b8df | 172 | |
491144b5 | 173 | bool debug_displaced = false; |
237fc4c9 PA |
174 | static void |
175 | show_debug_displaced (struct ui_file *file, int from_tty, | |
176 | struct cmd_list_element *c, const char *value) | |
177 | { | |
178 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
179 | } | |
180 | ||
ccce17b0 | 181 | unsigned int debug_infrun = 0; |
920d2a44 AC |
182 | static void |
183 | show_debug_infrun (struct ui_file *file, int from_tty, | |
184 | struct cmd_list_element *c, const char *value) | |
185 | { | |
186 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
187 | } | |
527159b7 | 188 | |
03583c20 UW |
189 | |
190 | /* Support for disabling address space randomization. */ | |
191 | ||
491144b5 | 192 | bool disable_randomization = true; |
03583c20 UW |
193 | |
194 | static void | |
195 | show_disable_randomization (struct ui_file *file, int from_tty, | |
196 | struct cmd_list_element *c, const char *value) | |
197 | { | |
198 | if (target_supports_disable_randomization ()) | |
199 | fprintf_filtered (file, | |
200 | _("Disabling randomization of debuggee's " | |
201 | "virtual address space is %s.\n"), | |
202 | value); | |
203 | else | |
204 | fputs_filtered (_("Disabling randomization of debuggee's " | |
205 | "virtual address space is unsupported on\n" | |
206 | "this platform.\n"), file); | |
207 | } | |
208 | ||
209 | static void | |
eb4c3f4a | 210 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
211 | struct cmd_list_element *c) |
212 | { | |
213 | if (!target_supports_disable_randomization ()) | |
214 | error (_("Disabling randomization of debuggee's " | |
215 | "virtual address space is unsupported on\n" | |
216 | "this platform.")); | |
217 | } | |
218 | ||
d32dc48e PA |
219 | /* User interface for non-stop mode. */ |
220 | ||
491144b5 CB |
221 | bool non_stop = false; |
222 | static bool non_stop_1 = false; | |
d32dc48e PA |
223 | |
224 | static void | |
eb4c3f4a | 225 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
226 | struct cmd_list_element *c) |
227 | { | |
228 | if (target_has_execution) | |
229 | { | |
230 | non_stop_1 = non_stop; | |
231 | error (_("Cannot change this setting while the inferior is running.")); | |
232 | } | |
233 | ||
234 | non_stop = non_stop_1; | |
235 | } | |
236 | ||
237 | static void | |
238 | show_non_stop (struct ui_file *file, int from_tty, | |
239 | struct cmd_list_element *c, const char *value) | |
240 | { | |
241 | fprintf_filtered (file, | |
242 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
243 | value); | |
244 | } | |
245 | ||
d914c394 SS |
246 | /* "Observer mode" is somewhat like a more extreme version of |
247 | non-stop, in which all GDB operations that might affect the | |
248 | target's execution have been disabled. */ | |
249 | ||
491144b5 CB |
250 | bool observer_mode = false; |
251 | static bool observer_mode_1 = false; | |
d914c394 SS |
252 | |
253 | static void | |
eb4c3f4a | 254 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
255 | struct cmd_list_element *c) |
256 | { | |
d914c394 SS |
257 | if (target_has_execution) |
258 | { | |
259 | observer_mode_1 = observer_mode; | |
260 | error (_("Cannot change this setting while the inferior is running.")); | |
261 | } | |
262 | ||
263 | observer_mode = observer_mode_1; | |
264 | ||
265 | may_write_registers = !observer_mode; | |
266 | may_write_memory = !observer_mode; | |
267 | may_insert_breakpoints = !observer_mode; | |
268 | may_insert_tracepoints = !observer_mode; | |
269 | /* We can insert fast tracepoints in or out of observer mode, | |
270 | but enable them if we're going into this mode. */ | |
271 | if (observer_mode) | |
491144b5 | 272 | may_insert_fast_tracepoints = true; |
d914c394 SS |
273 | may_stop = !observer_mode; |
274 | update_target_permissions (); | |
275 | ||
276 | /* Going *into* observer mode we must force non-stop, then | |
277 | going out we leave it that way. */ | |
278 | if (observer_mode) | |
279 | { | |
d914c394 | 280 | pagination_enabled = 0; |
491144b5 | 281 | non_stop = non_stop_1 = true; |
d914c394 SS |
282 | } |
283 | ||
284 | if (from_tty) | |
285 | printf_filtered (_("Observer mode is now %s.\n"), | |
286 | (observer_mode ? "on" : "off")); | |
287 | } | |
288 | ||
289 | static void | |
290 | show_observer_mode (struct ui_file *file, int from_tty, | |
291 | struct cmd_list_element *c, const char *value) | |
292 | { | |
293 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
294 | } | |
295 | ||
296 | /* This updates the value of observer mode based on changes in | |
297 | permissions. Note that we are deliberately ignoring the values of | |
298 | may-write-registers and may-write-memory, since the user may have | |
299 | reason to enable these during a session, for instance to turn on a | |
300 | debugging-related global. */ | |
301 | ||
302 | void | |
303 | update_observer_mode (void) | |
304 | { | |
491144b5 CB |
305 | bool newval = (!may_insert_breakpoints |
306 | && !may_insert_tracepoints | |
307 | && may_insert_fast_tracepoints | |
308 | && !may_stop | |
309 | && non_stop); | |
d914c394 SS |
310 | |
311 | /* Let the user know if things change. */ | |
312 | if (newval != observer_mode) | |
313 | printf_filtered (_("Observer mode is now %s.\n"), | |
314 | (newval ? "on" : "off")); | |
315 | ||
316 | observer_mode = observer_mode_1 = newval; | |
317 | } | |
c2c6d25f | 318 | |
c906108c SS |
319 | /* Tables of how to react to signals; the user sets them. */ |
320 | ||
adc6a863 PA |
321 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
322 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
323 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 324 | |
ab04a2af TT |
325 | /* Table of signals that are registered with "catch signal". A |
326 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
327 | signal" command. */ |
328 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 329 | |
2455069d UW |
330 | /* Table of signals that the target may silently handle. |
331 | This is automatically determined from the flags above, | |
332 | and simply cached here. */ | |
adc6a863 | 333 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 334 | |
c906108c SS |
335 | #define SET_SIGS(nsigs,sigs,flags) \ |
336 | do { \ | |
337 | int signum = (nsigs); \ | |
338 | while (signum-- > 0) \ | |
339 | if ((sigs)[signum]) \ | |
340 | (flags)[signum] = 1; \ | |
341 | } while (0) | |
342 | ||
343 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
344 | do { \ | |
345 | int signum = (nsigs); \ | |
346 | while (signum-- > 0) \ | |
347 | if ((sigs)[signum]) \ | |
348 | (flags)[signum] = 0; \ | |
349 | } while (0) | |
350 | ||
9b224c5e PA |
351 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
352 | this function is to avoid exporting `signal_program'. */ | |
353 | ||
354 | void | |
355 | update_signals_program_target (void) | |
356 | { | |
adc6a863 | 357 | target_program_signals (signal_program); |
9b224c5e PA |
358 | } |
359 | ||
1777feb0 | 360 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 361 | |
edb3359d | 362 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
363 | |
364 | /* Command list pointer for the "stop" placeholder. */ | |
365 | ||
366 | static struct cmd_list_element *stop_command; | |
367 | ||
c906108c SS |
368 | /* Nonzero if we want to give control to the user when we're notified |
369 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 370 | int stop_on_solib_events; |
f9e14852 GB |
371 | |
372 | /* Enable or disable optional shared library event breakpoints | |
373 | as appropriate when the above flag is changed. */ | |
374 | ||
375 | static void | |
eb4c3f4a TT |
376 | set_stop_on_solib_events (const char *args, |
377 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
378 | { |
379 | update_solib_breakpoints (); | |
380 | } | |
381 | ||
920d2a44 AC |
382 | static void |
383 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
384 | struct cmd_list_element *c, const char *value) | |
385 | { | |
386 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
387 | value); | |
388 | } | |
c906108c | 389 | |
c906108c SS |
390 | /* Nonzero after stop if current stack frame should be printed. */ |
391 | ||
392 | static int stop_print_frame; | |
393 | ||
5b6d1e4f PA |
394 | /* This is a cached copy of the target/ptid/waitstatus of the last |
395 | event returned by target_wait()/deprecated_target_wait_hook(). | |
396 | This information is returned by get_last_target_status(). */ | |
397 | static process_stratum_target *target_last_proc_target; | |
39f77062 | 398 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
399 | static struct target_waitstatus target_last_waitstatus; |
400 | ||
4e1c45ea | 401 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 402 | |
53904c9e AC |
403 | static const char follow_fork_mode_child[] = "child"; |
404 | static const char follow_fork_mode_parent[] = "parent"; | |
405 | ||
40478521 | 406 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
407 | follow_fork_mode_child, |
408 | follow_fork_mode_parent, | |
409 | NULL | |
ef346e04 | 410 | }; |
c906108c | 411 | |
53904c9e | 412 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
413 | static void |
414 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
415 | struct cmd_list_element *c, const char *value) | |
416 | { | |
3e43a32a MS |
417 | fprintf_filtered (file, |
418 | _("Debugger response to a program " | |
419 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
420 | value); |
421 | } | |
c906108c SS |
422 | \f |
423 | ||
d83ad864 DB |
424 | /* Handle changes to the inferior list based on the type of fork, |
425 | which process is being followed, and whether the other process | |
426 | should be detached. On entry inferior_ptid must be the ptid of | |
427 | the fork parent. At return inferior_ptid is the ptid of the | |
428 | followed inferior. */ | |
429 | ||
5ab2fbf1 SM |
430 | static bool |
431 | follow_fork_inferior (bool follow_child, bool detach_fork) | |
d83ad864 DB |
432 | { |
433 | int has_vforked; | |
79639e11 | 434 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
435 | |
436 | has_vforked = (inferior_thread ()->pending_follow.kind | |
437 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
438 | parent_ptid = inferior_ptid; |
439 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
440 | |
441 | if (has_vforked | |
442 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 443 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
444 | && !(follow_child || detach_fork || sched_multi)) |
445 | { | |
446 | /* The parent stays blocked inside the vfork syscall until the | |
447 | child execs or exits. If we don't let the child run, then | |
448 | the parent stays blocked. If we're telling the parent to run | |
449 | in the foreground, the user will not be able to ctrl-c to get | |
450 | back the terminal, effectively hanging the debug session. */ | |
451 | fprintf_filtered (gdb_stderr, _("\ | |
452 | Can not resume the parent process over vfork in the foreground while\n\ | |
453 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
454 | \"set schedule-multiple\".\n")); | |
d83ad864 DB |
455 | return 1; |
456 | } | |
457 | ||
458 | if (!follow_child) | |
459 | { | |
460 | /* Detach new forked process? */ | |
461 | if (detach_fork) | |
462 | { | |
d83ad864 DB |
463 | /* Before detaching from the child, remove all breakpoints |
464 | from it. If we forked, then this has already been taken | |
465 | care of by infrun.c. If we vforked however, any | |
466 | breakpoint inserted in the parent is visible in the | |
467 | child, even those added while stopped in a vfork | |
468 | catchpoint. This will remove the breakpoints from the | |
469 | parent also, but they'll be reinserted below. */ | |
470 | if (has_vforked) | |
471 | { | |
472 | /* Keep breakpoints list in sync. */ | |
00431a78 | 473 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
474 | } |
475 | ||
f67c0c91 | 476 | if (print_inferior_events) |
d83ad864 | 477 | { |
8dd06f7a | 478 | /* Ensure that we have a process ptid. */ |
e99b03dc | 479 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 480 | |
223ffa71 | 481 | target_terminal::ours_for_output (); |
d83ad864 | 482 | fprintf_filtered (gdb_stdlog, |
f67c0c91 | 483 | _("[Detaching after %s from child %s]\n"), |
6f259a23 | 484 | has_vforked ? "vfork" : "fork", |
a068643d | 485 | target_pid_to_str (process_ptid).c_str ()); |
d83ad864 DB |
486 | } |
487 | } | |
488 | else | |
489 | { | |
490 | struct inferior *parent_inf, *child_inf; | |
d83ad864 DB |
491 | |
492 | /* Add process to GDB's tables. */ | |
e99b03dc | 493 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
494 | |
495 | parent_inf = current_inferior (); | |
496 | child_inf->attach_flag = parent_inf->attach_flag; | |
497 | copy_terminal_info (child_inf, parent_inf); | |
498 | child_inf->gdbarch = parent_inf->gdbarch; | |
499 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
500 | ||
5ed8105e | 501 | scoped_restore_current_pspace_and_thread restore_pspace_thread; |
d83ad864 | 502 | |
2a00d7ce | 503 | set_current_inferior (child_inf); |
5b6d1e4f | 504 | switch_to_no_thread (); |
d83ad864 | 505 | child_inf->symfile_flags = SYMFILE_NO_READ; |
5b6d1e4f PA |
506 | push_target (parent_inf->process_target ()); |
507 | add_thread_silent (child_inf->process_target (), child_ptid); | |
508 | inferior_ptid = child_ptid; | |
d83ad864 DB |
509 | |
510 | /* If this is a vfork child, then the address-space is | |
511 | shared with the parent. */ | |
512 | if (has_vforked) | |
513 | { | |
514 | child_inf->pspace = parent_inf->pspace; | |
515 | child_inf->aspace = parent_inf->aspace; | |
516 | ||
5b6d1e4f PA |
517 | exec_on_vfork (); |
518 | ||
d83ad864 DB |
519 | /* The parent will be frozen until the child is done |
520 | with the shared region. Keep track of the | |
521 | parent. */ | |
522 | child_inf->vfork_parent = parent_inf; | |
523 | child_inf->pending_detach = 0; | |
524 | parent_inf->vfork_child = child_inf; | |
525 | parent_inf->pending_detach = 0; | |
526 | } | |
527 | else | |
528 | { | |
529 | child_inf->aspace = new_address_space (); | |
564b1e3f | 530 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
531 | child_inf->removable = 1; |
532 | set_current_program_space (child_inf->pspace); | |
533 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
534 | ||
535 | /* Let the shared library layer (e.g., solib-svr4) learn | |
536 | about this new process, relocate the cloned exec, pull | |
537 | in shared libraries, and install the solib event | |
538 | breakpoint. If a "cloned-VM" event was propagated | |
539 | better throughout the core, this wouldn't be | |
540 | required. */ | |
541 | solib_create_inferior_hook (0); | |
542 | } | |
d83ad864 DB |
543 | } |
544 | ||
545 | if (has_vforked) | |
546 | { | |
547 | struct inferior *parent_inf; | |
548 | ||
549 | parent_inf = current_inferior (); | |
550 | ||
551 | /* If we detached from the child, then we have to be careful | |
552 | to not insert breakpoints in the parent until the child | |
553 | is done with the shared memory region. However, if we're | |
554 | staying attached to the child, then we can and should | |
555 | insert breakpoints, so that we can debug it. A | |
556 | subsequent child exec or exit is enough to know when does | |
557 | the child stops using the parent's address space. */ | |
558 | parent_inf->waiting_for_vfork_done = detach_fork; | |
559 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
560 | } | |
561 | } | |
562 | else | |
563 | { | |
564 | /* Follow the child. */ | |
565 | struct inferior *parent_inf, *child_inf; | |
566 | struct program_space *parent_pspace; | |
567 | ||
f67c0c91 | 568 | if (print_inferior_events) |
d83ad864 | 569 | { |
f67c0c91 SDJ |
570 | std::string parent_pid = target_pid_to_str (parent_ptid); |
571 | std::string child_pid = target_pid_to_str (child_ptid); | |
572 | ||
223ffa71 | 573 | target_terminal::ours_for_output (); |
6f259a23 | 574 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
575 | _("[Attaching after %s %s to child %s]\n"), |
576 | parent_pid.c_str (), | |
6f259a23 | 577 | has_vforked ? "vfork" : "fork", |
f67c0c91 | 578 | child_pid.c_str ()); |
d83ad864 DB |
579 | } |
580 | ||
581 | /* Add the new inferior first, so that the target_detach below | |
582 | doesn't unpush the target. */ | |
583 | ||
e99b03dc | 584 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
585 | |
586 | parent_inf = current_inferior (); | |
587 | child_inf->attach_flag = parent_inf->attach_flag; | |
588 | copy_terminal_info (child_inf, parent_inf); | |
589 | child_inf->gdbarch = parent_inf->gdbarch; | |
590 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
591 | ||
592 | parent_pspace = parent_inf->pspace; | |
593 | ||
5b6d1e4f | 594 | process_stratum_target *target = parent_inf->process_target (); |
d83ad864 | 595 | |
5b6d1e4f PA |
596 | { |
597 | /* Hold a strong reference to the target while (maybe) | |
598 | detaching the parent. Otherwise detaching could close the | |
599 | target. */ | |
600 | auto target_ref = target_ops_ref::new_reference (target); | |
601 | ||
602 | /* If we're vforking, we want to hold on to the parent until | |
603 | the child exits or execs. At child exec or exit time we | |
604 | can remove the old breakpoints from the parent and detach | |
605 | or resume debugging it. Otherwise, detach the parent now; | |
606 | we'll want to reuse it's program/address spaces, but we | |
607 | can't set them to the child before removing breakpoints | |
608 | from the parent, otherwise, the breakpoints module could | |
609 | decide to remove breakpoints from the wrong process (since | |
610 | they'd be assigned to the same address space). */ | |
611 | ||
612 | if (has_vforked) | |
613 | { | |
614 | gdb_assert (child_inf->vfork_parent == NULL); | |
615 | gdb_assert (parent_inf->vfork_child == NULL); | |
616 | child_inf->vfork_parent = parent_inf; | |
617 | child_inf->pending_detach = 0; | |
618 | parent_inf->vfork_child = child_inf; | |
619 | parent_inf->pending_detach = detach_fork; | |
620 | parent_inf->waiting_for_vfork_done = 0; | |
621 | } | |
622 | else if (detach_fork) | |
623 | { | |
624 | if (print_inferior_events) | |
625 | { | |
626 | /* Ensure that we have a process ptid. */ | |
627 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
628 | ||
629 | target_terminal::ours_for_output (); | |
630 | fprintf_filtered (gdb_stdlog, | |
631 | _("[Detaching after fork from " | |
632 | "parent %s]\n"), | |
633 | target_pid_to_str (process_ptid).c_str ()); | |
634 | } | |
8dd06f7a | 635 | |
5b6d1e4f PA |
636 | target_detach (parent_inf, 0); |
637 | parent_inf = NULL; | |
638 | } | |
6f259a23 | 639 | |
5b6d1e4f | 640 | /* Note that the detach above makes PARENT_INF dangling. */ |
d83ad864 | 641 | |
5b6d1e4f PA |
642 | /* Add the child thread to the appropriate lists, and switch |
643 | to this new thread, before cloning the program space, and | |
644 | informing the solib layer about this new process. */ | |
d83ad864 | 645 | |
5b6d1e4f PA |
646 | set_current_inferior (child_inf); |
647 | push_target (target); | |
648 | } | |
d83ad864 | 649 | |
5b6d1e4f | 650 | add_thread_silent (target, child_ptid); |
79639e11 | 651 | inferior_ptid = child_ptid; |
d83ad864 DB |
652 | |
653 | /* If this is a vfork child, then the address-space is shared | |
654 | with the parent. If we detached from the parent, then we can | |
655 | reuse the parent's program/address spaces. */ | |
656 | if (has_vforked || detach_fork) | |
657 | { | |
658 | child_inf->pspace = parent_pspace; | |
659 | child_inf->aspace = child_inf->pspace->aspace; | |
5b6d1e4f PA |
660 | |
661 | exec_on_vfork (); | |
d83ad864 DB |
662 | } |
663 | else | |
664 | { | |
665 | child_inf->aspace = new_address_space (); | |
564b1e3f | 666 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
667 | child_inf->removable = 1; |
668 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
669 | set_current_program_space (child_inf->pspace); | |
670 | clone_program_space (child_inf->pspace, parent_pspace); | |
671 | ||
672 | /* Let the shared library layer (e.g., solib-svr4) learn | |
673 | about this new process, relocate the cloned exec, pull in | |
674 | shared libraries, and install the solib event breakpoint. | |
675 | If a "cloned-VM" event was propagated better throughout | |
676 | the core, this wouldn't be required. */ | |
677 | solib_create_inferior_hook (0); | |
678 | } | |
679 | } | |
680 | ||
681 | return target_follow_fork (follow_child, detach_fork); | |
682 | } | |
683 | ||
e58b0e63 PA |
684 | /* Tell the target to follow the fork we're stopped at. Returns true |
685 | if the inferior should be resumed; false, if the target for some | |
686 | reason decided it's best not to resume. */ | |
687 | ||
5ab2fbf1 SM |
688 | static bool |
689 | follow_fork () | |
c906108c | 690 | { |
5ab2fbf1 SM |
691 | bool follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
692 | bool should_resume = true; | |
e58b0e63 PA |
693 | struct thread_info *tp; |
694 | ||
695 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
696 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
697 | parent thread structure's run control related fields, not just these. |
698 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
699 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 700 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
701 | CORE_ADDR step_range_start = 0; |
702 | CORE_ADDR step_range_end = 0; | |
bf4cb9be TV |
703 | int current_line = 0; |
704 | symtab *current_symtab = NULL; | |
4e3990f4 | 705 | struct frame_id step_frame_id = { 0 }; |
8980e177 | 706 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
707 | |
708 | if (!non_stop) | |
709 | { | |
5b6d1e4f | 710 | process_stratum_target *wait_target; |
e58b0e63 PA |
711 | ptid_t wait_ptid; |
712 | struct target_waitstatus wait_status; | |
713 | ||
714 | /* Get the last target status returned by target_wait(). */ | |
5b6d1e4f | 715 | get_last_target_status (&wait_target, &wait_ptid, &wait_status); |
e58b0e63 PA |
716 | |
717 | /* If not stopped at a fork event, then there's nothing else to | |
718 | do. */ | |
719 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
720 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
721 | return 1; | |
722 | ||
723 | /* Check if we switched over from WAIT_PTID, since the event was | |
724 | reported. */ | |
00431a78 | 725 | if (wait_ptid != minus_one_ptid |
5b6d1e4f PA |
726 | && (current_inferior ()->process_target () != wait_target |
727 | || inferior_ptid != wait_ptid)) | |
e58b0e63 PA |
728 | { |
729 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
730 | target to follow it (in either direction). We'll | |
731 | afterwards refuse to resume, and inform the user what | |
732 | happened. */ | |
5b6d1e4f | 733 | thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid); |
00431a78 | 734 | switch_to_thread (wait_thread); |
5ab2fbf1 | 735 | should_resume = false; |
e58b0e63 PA |
736 | } |
737 | } | |
738 | ||
739 | tp = inferior_thread (); | |
740 | ||
741 | /* If there were any forks/vforks that were caught and are now to be | |
742 | followed, then do so now. */ | |
743 | switch (tp->pending_follow.kind) | |
744 | { | |
745 | case TARGET_WAITKIND_FORKED: | |
746 | case TARGET_WAITKIND_VFORKED: | |
747 | { | |
748 | ptid_t parent, child; | |
749 | ||
750 | /* If the user did a next/step, etc, over a fork call, | |
751 | preserve the stepping state in the fork child. */ | |
752 | if (follow_child && should_resume) | |
753 | { | |
8358c15c JK |
754 | step_resume_breakpoint = clone_momentary_breakpoint |
755 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
756 | step_range_start = tp->control.step_range_start; |
757 | step_range_end = tp->control.step_range_end; | |
bf4cb9be TV |
758 | current_line = tp->current_line; |
759 | current_symtab = tp->current_symtab; | |
16c381f0 | 760 | step_frame_id = tp->control.step_frame_id; |
186c406b TT |
761 | exception_resume_breakpoint |
762 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 763 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
764 | |
765 | /* For now, delete the parent's sr breakpoint, otherwise, | |
766 | parent/child sr breakpoints are considered duplicates, | |
767 | and the child version will not be installed. Remove | |
768 | this when the breakpoints module becomes aware of | |
769 | inferiors and address spaces. */ | |
770 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
771 | tp->control.step_range_start = 0; |
772 | tp->control.step_range_end = 0; | |
773 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 774 | delete_exception_resume_breakpoint (tp); |
8980e177 | 775 | tp->thread_fsm = NULL; |
e58b0e63 PA |
776 | } |
777 | ||
778 | parent = inferior_ptid; | |
779 | child = tp->pending_follow.value.related_pid; | |
780 | ||
5b6d1e4f | 781 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
782 | /* Set up inferior(s) as specified by the caller, and tell the |
783 | target to do whatever is necessary to follow either parent | |
784 | or child. */ | |
785 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
786 | { |
787 | /* Target refused to follow, or there's some other reason | |
788 | we shouldn't resume. */ | |
789 | should_resume = 0; | |
790 | } | |
791 | else | |
792 | { | |
793 | /* This pending follow fork event is now handled, one way | |
794 | or another. The previous selected thread may be gone | |
795 | from the lists by now, but if it is still around, need | |
796 | to clear the pending follow request. */ | |
5b6d1e4f | 797 | tp = find_thread_ptid (parent_targ, parent); |
e58b0e63 PA |
798 | if (tp) |
799 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
800 | ||
801 | /* This makes sure we don't try to apply the "Switched | |
802 | over from WAIT_PID" logic above. */ | |
803 | nullify_last_target_wait_ptid (); | |
804 | ||
1777feb0 | 805 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
806 | if (follow_child) |
807 | { | |
5b6d1e4f | 808 | thread_info *child_thr = find_thread_ptid (parent_targ, child); |
00431a78 | 809 | switch_to_thread (child_thr); |
e58b0e63 PA |
810 | |
811 | /* ... and preserve the stepping state, in case the | |
812 | user was stepping over the fork call. */ | |
813 | if (should_resume) | |
814 | { | |
815 | tp = inferior_thread (); | |
8358c15c JK |
816 | tp->control.step_resume_breakpoint |
817 | = step_resume_breakpoint; | |
16c381f0 JK |
818 | tp->control.step_range_start = step_range_start; |
819 | tp->control.step_range_end = step_range_end; | |
bf4cb9be TV |
820 | tp->current_line = current_line; |
821 | tp->current_symtab = current_symtab; | |
16c381f0 | 822 | tp->control.step_frame_id = step_frame_id; |
186c406b TT |
823 | tp->control.exception_resume_breakpoint |
824 | = exception_resume_breakpoint; | |
8980e177 | 825 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
826 | } |
827 | else | |
828 | { | |
829 | /* If we get here, it was because we're trying to | |
830 | resume from a fork catchpoint, but, the user | |
831 | has switched threads away from the thread that | |
832 | forked. In that case, the resume command | |
833 | issued is most likely not applicable to the | |
834 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 835 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 836 | "before following fork child.")); |
e58b0e63 PA |
837 | } |
838 | ||
839 | /* Reset breakpoints in the child as appropriate. */ | |
840 | follow_inferior_reset_breakpoints (); | |
841 | } | |
e58b0e63 PA |
842 | } |
843 | } | |
844 | break; | |
845 | case TARGET_WAITKIND_SPURIOUS: | |
846 | /* Nothing to follow. */ | |
847 | break; | |
848 | default: | |
849 | internal_error (__FILE__, __LINE__, | |
850 | "Unexpected pending_follow.kind %d\n", | |
851 | tp->pending_follow.kind); | |
852 | break; | |
853 | } | |
c906108c | 854 | |
e58b0e63 | 855 | return should_resume; |
c906108c SS |
856 | } |
857 | ||
d83ad864 | 858 | static void |
6604731b | 859 | follow_inferior_reset_breakpoints (void) |
c906108c | 860 | { |
4e1c45ea PA |
861 | struct thread_info *tp = inferior_thread (); |
862 | ||
6604731b DJ |
863 | /* Was there a step_resume breakpoint? (There was if the user |
864 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
865 | thread number. Cloned step_resume breakpoints are disabled on |
866 | creation, so enable it here now that it is associated with the | |
867 | correct thread. | |
6604731b DJ |
868 | |
869 | step_resumes are a form of bp that are made to be per-thread. | |
870 | Since we created the step_resume bp when the parent process | |
871 | was being debugged, and now are switching to the child process, | |
872 | from the breakpoint package's viewpoint, that's a switch of | |
873 | "threads". We must update the bp's notion of which thread | |
874 | it is for, or it'll be ignored when it triggers. */ | |
875 | ||
8358c15c | 876 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
877 | { |
878 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
879 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
880 | } | |
6604731b | 881 | |
a1aa2221 | 882 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 883 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
884 | { |
885 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
886 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
887 | } | |
186c406b | 888 | |
6604731b DJ |
889 | /* Reinsert all breakpoints in the child. The user may have set |
890 | breakpoints after catching the fork, in which case those | |
891 | were never set in the child, but only in the parent. This makes | |
892 | sure the inserted breakpoints match the breakpoint list. */ | |
893 | ||
894 | breakpoint_re_set (); | |
895 | insert_breakpoints (); | |
c906108c | 896 | } |
c906108c | 897 | |
6c95b8df PA |
898 | /* The child has exited or execed: resume threads of the parent the |
899 | user wanted to be executing. */ | |
900 | ||
901 | static int | |
902 | proceed_after_vfork_done (struct thread_info *thread, | |
903 | void *arg) | |
904 | { | |
905 | int pid = * (int *) arg; | |
906 | ||
00431a78 PA |
907 | if (thread->ptid.pid () == pid |
908 | && thread->state == THREAD_RUNNING | |
909 | && !thread->executing | |
6c95b8df | 910 | && !thread->stop_requested |
a493e3e2 | 911 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df | 912 | { |
4100594e SM |
913 | infrun_log_debug ("resuming vfork parent thread %s", |
914 | target_pid_to_str (thread->ptid).c_str ()); | |
6c95b8df | 915 | |
00431a78 | 916 | switch_to_thread (thread); |
70509625 | 917 | clear_proceed_status (0); |
64ce06e4 | 918 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
919 | } |
920 | ||
921 | return 0; | |
922 | } | |
923 | ||
5ed8105e PA |
924 | /* Save/restore inferior_ptid, current program space and current |
925 | inferior. Only use this if the current context points at an exited | |
926 | inferior (and therefore there's no current thread to save). */ | |
927 | class scoped_restore_exited_inferior | |
928 | { | |
929 | public: | |
930 | scoped_restore_exited_inferior () | |
931 | : m_saved_ptid (&inferior_ptid) | |
932 | {} | |
933 | ||
934 | private: | |
935 | scoped_restore_tmpl<ptid_t> m_saved_ptid; | |
936 | scoped_restore_current_program_space m_pspace; | |
937 | scoped_restore_current_inferior m_inferior; | |
938 | }; | |
939 | ||
6c95b8df PA |
940 | /* Called whenever we notice an exec or exit event, to handle |
941 | detaching or resuming a vfork parent. */ | |
942 | ||
943 | static void | |
944 | handle_vfork_child_exec_or_exit (int exec) | |
945 | { | |
946 | struct inferior *inf = current_inferior (); | |
947 | ||
948 | if (inf->vfork_parent) | |
949 | { | |
950 | int resume_parent = -1; | |
951 | ||
952 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
953 | between the parent and the child. Break the bonds. */ |
954 | inferior *vfork_parent = inf->vfork_parent; | |
955 | inf->vfork_parent->vfork_child = NULL; | |
956 | inf->vfork_parent = NULL; | |
6c95b8df | 957 | |
b73715df TV |
958 | /* If the user wanted to detach from the parent, now is the |
959 | time. */ | |
960 | if (vfork_parent->pending_detach) | |
6c95b8df PA |
961 | { |
962 | struct thread_info *tp; | |
6c95b8df PA |
963 | struct program_space *pspace; |
964 | struct address_space *aspace; | |
965 | ||
1777feb0 | 966 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 967 | |
b73715df | 968 | vfork_parent->pending_detach = 0; |
68c9da30 | 969 | |
5ed8105e PA |
970 | gdb::optional<scoped_restore_exited_inferior> |
971 | maybe_restore_inferior; | |
972 | gdb::optional<scoped_restore_current_pspace_and_thread> | |
973 | maybe_restore_thread; | |
974 | ||
975 | /* If we're handling a child exit, then inferior_ptid points | |
976 | at the inferior's pid, not to a thread. */ | |
f50f4e56 | 977 | if (!exec) |
5ed8105e | 978 | maybe_restore_inferior.emplace (); |
f50f4e56 | 979 | else |
5ed8105e | 980 | maybe_restore_thread.emplace (); |
6c95b8df PA |
981 | |
982 | /* We're letting loose of the parent. */ | |
b73715df | 983 | tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 984 | switch_to_thread (tp); |
6c95b8df PA |
985 | |
986 | /* We're about to detach from the parent, which implicitly | |
987 | removes breakpoints from its address space. There's a | |
988 | catch here: we want to reuse the spaces for the child, | |
989 | but, parent/child are still sharing the pspace at this | |
990 | point, although the exec in reality makes the kernel give | |
991 | the child a fresh set of new pages. The problem here is | |
992 | that the breakpoints module being unaware of this, would | |
993 | likely chose the child process to write to the parent | |
994 | address space. Swapping the child temporarily away from | |
995 | the spaces has the desired effect. Yes, this is "sort | |
996 | of" a hack. */ | |
997 | ||
998 | pspace = inf->pspace; | |
999 | aspace = inf->aspace; | |
1000 | inf->aspace = NULL; | |
1001 | inf->pspace = NULL; | |
1002 | ||
f67c0c91 | 1003 | if (print_inferior_events) |
6c95b8df | 1004 | { |
a068643d | 1005 | std::string pidstr |
b73715df | 1006 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 1007 | |
223ffa71 | 1008 | target_terminal::ours_for_output (); |
6c95b8df PA |
1009 | |
1010 | if (exec) | |
6f259a23 DB |
1011 | { |
1012 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 1013 | _("[Detaching vfork parent %s " |
a068643d | 1014 | "after child exec]\n"), pidstr.c_str ()); |
6f259a23 | 1015 | } |
6c95b8df | 1016 | else |
6f259a23 DB |
1017 | { |
1018 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 1019 | _("[Detaching vfork parent %s " |
a068643d | 1020 | "after child exit]\n"), pidstr.c_str ()); |
6f259a23 | 1021 | } |
6c95b8df PA |
1022 | } |
1023 | ||
b73715df | 1024 | target_detach (vfork_parent, 0); |
6c95b8df PA |
1025 | |
1026 | /* Put it back. */ | |
1027 | inf->pspace = pspace; | |
1028 | inf->aspace = aspace; | |
6c95b8df PA |
1029 | } |
1030 | else if (exec) | |
1031 | { | |
1032 | /* We're staying attached to the parent, so, really give the | |
1033 | child a new address space. */ | |
564b1e3f | 1034 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
1035 | inf->aspace = inf->pspace->aspace; |
1036 | inf->removable = 1; | |
1037 | set_current_program_space (inf->pspace); | |
1038 | ||
b73715df | 1039 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1040 | } |
1041 | else | |
1042 | { | |
6c95b8df PA |
1043 | /* If this is a vfork child exiting, then the pspace and |
1044 | aspaces were shared with the parent. Since we're | |
1045 | reporting the process exit, we'll be mourning all that is | |
1046 | found in the address space, and switching to null_ptid, | |
1047 | preparing to start a new inferior. But, since we don't | |
1048 | want to clobber the parent's address/program spaces, we | |
1049 | go ahead and create a new one for this exiting | |
1050 | inferior. */ | |
1051 | ||
5ed8105e PA |
1052 | /* Switch to null_ptid while running clone_program_space, so |
1053 | that clone_program_space doesn't want to read the | |
1054 | selected frame of a dead process. */ | |
1055 | scoped_restore restore_ptid | |
1056 | = make_scoped_restore (&inferior_ptid, null_ptid); | |
6c95b8df | 1057 | |
53af73bf PA |
1058 | inf->pspace = new program_space (maybe_new_address_space ()); |
1059 | inf->aspace = inf->pspace->aspace; | |
1060 | set_current_program_space (inf->pspace); | |
6c95b8df | 1061 | inf->removable = 1; |
7dcd53a0 | 1062 | inf->symfile_flags = SYMFILE_NO_READ; |
53af73bf | 1063 | clone_program_space (inf->pspace, vfork_parent->pspace); |
6c95b8df | 1064 | |
b73715df | 1065 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1066 | } |
1067 | ||
6c95b8df PA |
1068 | gdb_assert (current_program_space == inf->pspace); |
1069 | ||
1070 | if (non_stop && resume_parent != -1) | |
1071 | { | |
1072 | /* If the user wanted the parent to be running, let it go | |
1073 | free now. */ | |
5ed8105e | 1074 | scoped_restore_current_thread restore_thread; |
6c95b8df | 1075 | |
4100594e SM |
1076 | infrun_log_debug ("resuming vfork parent process %d", |
1077 | resume_parent); | |
6c95b8df PA |
1078 | |
1079 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1080 | } |
1081 | } | |
1082 | } | |
1083 | ||
eb6c553b | 1084 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1085 | |
1086 | static const char follow_exec_mode_new[] = "new"; | |
1087 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1088 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1089 | { |
1090 | follow_exec_mode_new, | |
1091 | follow_exec_mode_same, | |
1092 | NULL, | |
1093 | }; | |
1094 | ||
1095 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1096 | static void | |
1097 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1098 | struct cmd_list_element *c, const char *value) | |
1099 | { | |
1100 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1101 | } | |
1102 | ||
ecf45d2c | 1103 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1104 | |
c906108c | 1105 | static void |
4ca51187 | 1106 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1107 | { |
6c95b8df | 1108 | struct inferior *inf = current_inferior (); |
e99b03dc | 1109 | int pid = ptid.pid (); |
94585166 | 1110 | ptid_t process_ptid; |
7a292a7a | 1111 | |
65d2b333 PW |
1112 | /* Switch terminal for any messages produced e.g. by |
1113 | breakpoint_re_set. */ | |
1114 | target_terminal::ours_for_output (); | |
1115 | ||
c906108c SS |
1116 | /* This is an exec event that we actually wish to pay attention to. |
1117 | Refresh our symbol table to the newly exec'd program, remove any | |
1118 | momentary bp's, etc. | |
1119 | ||
1120 | If there are breakpoints, they aren't really inserted now, | |
1121 | since the exec() transformed our inferior into a fresh set | |
1122 | of instructions. | |
1123 | ||
1124 | We want to preserve symbolic breakpoints on the list, since | |
1125 | we have hopes that they can be reset after the new a.out's | |
1126 | symbol table is read. | |
1127 | ||
1128 | However, any "raw" breakpoints must be removed from the list | |
1129 | (e.g., the solib bp's), since their address is probably invalid | |
1130 | now. | |
1131 | ||
1132 | And, we DON'T want to call delete_breakpoints() here, since | |
1133 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1134 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1135 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1136 | |
1137 | mark_breakpoints_out (); | |
1138 | ||
95e50b27 PA |
1139 | /* The target reports the exec event to the main thread, even if |
1140 | some other thread does the exec, and even if the main thread was | |
1141 | stopped or already gone. We may still have non-leader threads of | |
1142 | the process on our list. E.g., on targets that don't have thread | |
1143 | exit events (like remote); or on native Linux in non-stop mode if | |
1144 | there were only two threads in the inferior and the non-leader | |
1145 | one is the one that execs (and nothing forces an update of the | |
1146 | thread list up to here). When debugging remotely, it's best to | |
1147 | avoid extra traffic, when possible, so avoid syncing the thread | |
1148 | list with the target, and instead go ahead and delete all threads | |
1149 | of the process but one that reported the event. Note this must | |
1150 | be done before calling update_breakpoints_after_exec, as | |
1151 | otherwise clearing the threads' resources would reference stale | |
1152 | thread breakpoints -- it may have been one of these threads that | |
1153 | stepped across the exec. We could just clear their stepping | |
1154 | states, but as long as we're iterating, might as well delete | |
1155 | them. Deleting them now rather than at the next user-visible | |
1156 | stop provides a nicer sequence of events for user and MI | |
1157 | notifications. */ | |
08036331 | 1158 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1159 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1160 | delete_thread (th); |
95e50b27 PA |
1161 | |
1162 | /* We also need to clear any left over stale state for the | |
1163 | leader/event thread. E.g., if there was any step-resume | |
1164 | breakpoint or similar, it's gone now. We cannot truly | |
1165 | step-to-next statement through an exec(). */ | |
08036331 | 1166 | thread_info *th = inferior_thread (); |
8358c15c | 1167 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1168 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1169 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1170 | th->control.step_range_start = 0; |
1171 | th->control.step_range_end = 0; | |
c906108c | 1172 | |
95e50b27 PA |
1173 | /* The user may have had the main thread held stopped in the |
1174 | previous image (e.g., schedlock on, or non-stop). Release | |
1175 | it now. */ | |
a75724bc PA |
1176 | th->stop_requested = 0; |
1177 | ||
95e50b27 PA |
1178 | update_breakpoints_after_exec (); |
1179 | ||
1777feb0 | 1180 | /* What is this a.out's name? */ |
f2907e49 | 1181 | process_ptid = ptid_t (pid); |
6c95b8df | 1182 | printf_unfiltered (_("%s is executing new program: %s\n"), |
a068643d | 1183 | target_pid_to_str (process_ptid).c_str (), |
ecf45d2c | 1184 | exec_file_target); |
c906108c SS |
1185 | |
1186 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1187 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1188 | |
6ca15a4b | 1189 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1190 | |
797bc1cb TT |
1191 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1192 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1193 | |
ecf45d2c SL |
1194 | /* If we were unable to map the executable target pathname onto a host |
1195 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1196 | is confusing. Maybe it would even be better to stop at this point | |
1197 | so that the user can specify a file manually before continuing. */ | |
1198 | if (exec_file_host == NULL) | |
1199 | warning (_("Could not load symbols for executable %s.\n" | |
1200 | "Do you need \"set sysroot\"?"), | |
1201 | exec_file_target); | |
c906108c | 1202 | |
cce9b6bf PA |
1203 | /* Reset the shared library package. This ensures that we get a |
1204 | shlib event when the child reaches "_start", at which point the | |
1205 | dld will have had a chance to initialize the child. */ | |
1206 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1207 | we don't want those to be satisfied by the libraries of the | |
1208 | previous incarnation of this process. */ | |
1209 | no_shared_libraries (NULL, 0); | |
1210 | ||
6c95b8df PA |
1211 | if (follow_exec_mode_string == follow_exec_mode_new) |
1212 | { | |
6c95b8df PA |
1213 | /* The user wants to keep the old inferior and program spaces |
1214 | around. Create a new fresh one, and switch to it. */ | |
1215 | ||
35ed81d4 SM |
1216 | /* Do exit processing for the original inferior before setting the new |
1217 | inferior's pid. Having two inferiors with the same pid would confuse | |
1218 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1219 | old to the new inferior. */ | |
1220 | inf = add_inferior_with_spaces (); | |
1221 | swap_terminal_info (inf, current_inferior ()); | |
057302ce | 1222 | exit_inferior_silent (current_inferior ()); |
17d8546e | 1223 | |
94585166 | 1224 | inf->pid = pid; |
ecf45d2c | 1225 | target_follow_exec (inf, exec_file_target); |
6c95b8df | 1226 | |
5b6d1e4f PA |
1227 | inferior *org_inferior = current_inferior (); |
1228 | switch_to_inferior_no_thread (inf); | |
1229 | push_target (org_inferior->process_target ()); | |
1230 | thread_info *thr = add_thread (inf->process_target (), ptid); | |
1231 | switch_to_thread (thr); | |
6c95b8df | 1232 | } |
9107fc8d PA |
1233 | else |
1234 | { | |
1235 | /* The old description may no longer be fit for the new image. | |
1236 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1237 | old description; we'll read a new one below. No need to do | |
1238 | this on "follow-exec-mode new", as the old inferior stays | |
1239 | around (its description is later cleared/refetched on | |
1240 | restart). */ | |
1241 | target_clear_description (); | |
1242 | } | |
6c95b8df PA |
1243 | |
1244 | gdb_assert (current_program_space == inf->pspace); | |
1245 | ||
ecf45d2c SL |
1246 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1247 | because the proper displacement for a PIE (Position Independent | |
1248 | Executable) main symbol file will only be computed by | |
1249 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1250 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1251 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1252 | |
9107fc8d PA |
1253 | /* If the target can specify a description, read it. Must do this |
1254 | after flipping to the new executable (because the target supplied | |
1255 | description must be compatible with the executable's | |
1256 | architecture, and the old executable may e.g., be 32-bit, while | |
1257 | the new one 64-bit), and before anything involving memory or | |
1258 | registers. */ | |
1259 | target_find_description (); | |
1260 | ||
268a4a75 | 1261 | solib_create_inferior_hook (0); |
c906108c | 1262 | |
4efc6507 DE |
1263 | jit_inferior_created_hook (); |
1264 | ||
c1e56572 JK |
1265 | breakpoint_re_set (); |
1266 | ||
c906108c SS |
1267 | /* Reinsert all breakpoints. (Those which were symbolic have |
1268 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1269 | to symbol_file_command...). */ |
c906108c SS |
1270 | insert_breakpoints (); |
1271 | ||
c0fdb45e SM |
1272 | gdb::observers::inferior_execd.notify (inf); |
1273 | ||
c906108c SS |
1274 | /* The next resume of this inferior should bring it to the shlib |
1275 | startup breakpoints. (If the user had also set bp's on | |
1276 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1277 | matically get reset there in the new process.). */ |
c906108c SS |
1278 | } |
1279 | ||
c2829269 PA |
1280 | /* The queue of threads that need to do a step-over operation to get |
1281 | past e.g., a breakpoint. What technique is used to step over the | |
1282 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1283 | same queue, to maintain rough temporal order of execution, in order | |
1284 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1285 | constantly stepping the same couple threads past their breakpoints | |
1286 | over and over, if the single-step finish fast enough. */ | |
bb88694d | 1287 | struct thread_info *global_thread_step_over_chain_head; |
c2829269 | 1288 | |
6c4cfb24 PA |
1289 | /* Bit flags indicating what the thread needs to step over. */ |
1290 | ||
8d297bbf | 1291 | enum step_over_what_flag |
6c4cfb24 PA |
1292 | { |
1293 | /* Step over a breakpoint. */ | |
1294 | STEP_OVER_BREAKPOINT = 1, | |
1295 | ||
1296 | /* Step past a non-continuable watchpoint, in order to let the | |
1297 | instruction execute so we can evaluate the watchpoint | |
1298 | expression. */ | |
1299 | STEP_OVER_WATCHPOINT = 2 | |
1300 | }; | |
8d297bbf | 1301 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1302 | |
963f9c80 | 1303 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1304 | |
1305 | struct step_over_info | |
1306 | { | |
963f9c80 PA |
1307 | /* If we're stepping past a breakpoint, this is the address space |
1308 | and address of the instruction the breakpoint is set at. We'll | |
1309 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1310 | non-NULL. */ | |
8b86c959 | 1311 | const address_space *aspace; |
31e77af2 | 1312 | CORE_ADDR address; |
963f9c80 PA |
1313 | |
1314 | /* The instruction being stepped over triggers a nonsteppable | |
1315 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1316 | int nonsteppable_watchpoint_p; | |
21edc42f YQ |
1317 | |
1318 | /* The thread's global number. */ | |
1319 | int thread; | |
31e77af2 PA |
1320 | }; |
1321 | ||
1322 | /* The step-over info of the location that is being stepped over. | |
1323 | ||
1324 | Note that with async/breakpoint always-inserted mode, a user might | |
1325 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1326 | being stepped over. As setting a new breakpoint inserts all | |
1327 | breakpoints, we need to make sure the breakpoint being stepped over | |
1328 | isn't inserted then. We do that by only clearing the step-over | |
1329 | info when the step-over is actually finished (or aborted). | |
1330 | ||
1331 | Presently GDB can only step over one breakpoint at any given time. | |
1332 | Given threads that can't run code in the same address space as the | |
1333 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1334 | to step-over at most one breakpoint per address space (so this info | |
1335 | could move to the address space object if/when GDB is extended). | |
1336 | The set of breakpoints being stepped over will normally be much | |
1337 | smaller than the set of all breakpoints, so a flag in the | |
1338 | breakpoint location structure would be wasteful. A separate list | |
1339 | also saves complexity and run-time, as otherwise we'd have to go | |
1340 | through all breakpoint locations clearing their flag whenever we | |
1341 | start a new sequence. Similar considerations weigh against storing | |
1342 | this info in the thread object. Plus, not all step overs actually | |
1343 | have breakpoint locations -- e.g., stepping past a single-step | |
1344 | breakpoint, or stepping to complete a non-continuable | |
1345 | watchpoint. */ | |
1346 | static struct step_over_info step_over_info; | |
1347 | ||
1348 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1349 | stepping over. |
1350 | N.B. We record the aspace and address now, instead of say just the thread, | |
1351 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1352 | |
1353 | static void | |
8b86c959 | 1354 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1355 | int nonsteppable_watchpoint_p, |
1356 | int thread) | |
31e77af2 PA |
1357 | { |
1358 | step_over_info.aspace = aspace; | |
1359 | step_over_info.address = address; | |
963f9c80 | 1360 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1361 | step_over_info.thread = thread; |
31e77af2 PA |
1362 | } |
1363 | ||
1364 | /* Called when we're not longer stepping over a breakpoint / an | |
1365 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1366 | ||
1367 | static void | |
1368 | clear_step_over_info (void) | |
1369 | { | |
4100594e | 1370 | infrun_log_debug ("clearing step over info"); |
31e77af2 PA |
1371 | step_over_info.aspace = NULL; |
1372 | step_over_info.address = 0; | |
963f9c80 | 1373 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1374 | step_over_info.thread = -1; |
31e77af2 PA |
1375 | } |
1376 | ||
7f89fd65 | 1377 | /* See infrun.h. */ |
31e77af2 PA |
1378 | |
1379 | int | |
1380 | stepping_past_instruction_at (struct address_space *aspace, | |
1381 | CORE_ADDR address) | |
1382 | { | |
1383 | return (step_over_info.aspace != NULL | |
1384 | && breakpoint_address_match (aspace, address, | |
1385 | step_over_info.aspace, | |
1386 | step_over_info.address)); | |
1387 | } | |
1388 | ||
963f9c80 PA |
1389 | /* See infrun.h. */ |
1390 | ||
21edc42f YQ |
1391 | int |
1392 | thread_is_stepping_over_breakpoint (int thread) | |
1393 | { | |
1394 | return (step_over_info.thread != -1 | |
1395 | && thread == step_over_info.thread); | |
1396 | } | |
1397 | ||
1398 | /* See infrun.h. */ | |
1399 | ||
963f9c80 PA |
1400 | int |
1401 | stepping_past_nonsteppable_watchpoint (void) | |
1402 | { | |
1403 | return step_over_info.nonsteppable_watchpoint_p; | |
1404 | } | |
1405 | ||
6cc83d2a PA |
1406 | /* Returns true if step-over info is valid. */ |
1407 | ||
1408 | static int | |
1409 | step_over_info_valid_p (void) | |
1410 | { | |
963f9c80 PA |
1411 | return (step_over_info.aspace != NULL |
1412 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1413 | } |
1414 | ||
c906108c | 1415 | \f |
237fc4c9 PA |
1416 | /* Displaced stepping. */ |
1417 | ||
1418 | /* In non-stop debugging mode, we must take special care to manage | |
1419 | breakpoints properly; in particular, the traditional strategy for | |
1420 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1421 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1422 | breakpoint it has hit while ensuring that other threads running | |
1423 | concurrently will hit the breakpoint as they should. | |
1424 | ||
1425 | The traditional way to step a thread T off a breakpoint in a | |
1426 | multi-threaded program in all-stop mode is as follows: | |
1427 | ||
1428 | a0) Initially, all threads are stopped, and breakpoints are not | |
1429 | inserted. | |
1430 | a1) We single-step T, leaving breakpoints uninserted. | |
1431 | a2) We insert breakpoints, and resume all threads. | |
1432 | ||
1433 | In non-stop debugging, however, this strategy is unsuitable: we | |
1434 | don't want to have to stop all threads in the system in order to | |
1435 | continue or step T past a breakpoint. Instead, we use displaced | |
1436 | stepping: | |
1437 | ||
1438 | n0) Initially, T is stopped, other threads are running, and | |
1439 | breakpoints are inserted. | |
1440 | n1) We copy the instruction "under" the breakpoint to a separate | |
1441 | location, outside the main code stream, making any adjustments | |
1442 | to the instruction, register, and memory state as directed by | |
1443 | T's architecture. | |
1444 | n2) We single-step T over the instruction at its new location. | |
1445 | n3) We adjust the resulting register and memory state as directed | |
1446 | by T's architecture. This includes resetting T's PC to point | |
1447 | back into the main instruction stream. | |
1448 | n4) We resume T. | |
1449 | ||
1450 | This approach depends on the following gdbarch methods: | |
1451 | ||
1452 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1453 | indicate where to copy the instruction, and how much space must | |
1454 | be reserved there. We use these in step n1. | |
1455 | ||
1456 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1457 | address, and makes any necessary adjustments to the instruction, | |
1458 | register contents, and memory. We use this in step n1. | |
1459 | ||
1460 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1461 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1462 | same effect the instruction would have had if we had executed it |
1463 | at its original address. We use this in step n3. | |
1464 | ||
237fc4c9 PA |
1465 | The gdbarch_displaced_step_copy_insn and |
1466 | gdbarch_displaced_step_fixup functions must be written so that | |
1467 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1468 | single-stepping across the copied instruction, and then applying | |
1469 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1470 | thread's memory and registers as stepping the instruction in place | |
1471 | would have. Exactly which responsibilities fall to the copy and | |
1472 | which fall to the fixup is up to the author of those functions. | |
1473 | ||
1474 | See the comments in gdbarch.sh for details. | |
1475 | ||
1476 | Note that displaced stepping and software single-step cannot | |
1477 | currently be used in combination, although with some care I think | |
1478 | they could be made to. Software single-step works by placing | |
1479 | breakpoints on all possible subsequent instructions; if the | |
1480 | displaced instruction is a PC-relative jump, those breakpoints | |
1481 | could fall in very strange places --- on pages that aren't | |
1482 | executable, or at addresses that are not proper instruction | |
1483 | boundaries. (We do generally let other threads run while we wait | |
1484 | to hit the software single-step breakpoint, and they might | |
1485 | encounter such a corrupted instruction.) One way to work around | |
1486 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1487 | simulate the effect of PC-relative instructions (and return NULL) | |
1488 | on architectures that use software single-stepping. | |
1489 | ||
1490 | In non-stop mode, we can have independent and simultaneous step | |
1491 | requests, so more than one thread may need to simultaneously step | |
1492 | over a breakpoint. The current implementation assumes there is | |
1493 | only one scratch space per process. In this case, we have to | |
1494 | serialize access to the scratch space. If thread A wants to step | |
1495 | over a breakpoint, but we are currently waiting for some other | |
1496 | thread to complete a displaced step, we leave thread A stopped and | |
1497 | place it in the displaced_step_request_queue. Whenever a displaced | |
1498 | step finishes, we pick the next thread in the queue and start a new | |
1499 | displaced step operation on it. See displaced_step_prepare and | |
1500 | displaced_step_fixup for details. */ | |
1501 | ||
e088209c | 1502 | /* Get the displaced stepping state of inferior INF. */ |
fc1cf338 | 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 | ||
e088209c | 1510 | /* Get the displaced stepping state of thread THREAD. */ |
372316f1 | 1511 | |
e088209c SM |
1512 | static displaced_step_thread_state * |
1513 | get_displaced_stepping_state (thread_info *thread) | |
372316f1 | 1514 | { |
e088209c | 1515 | return &thread->displaced_step_state; |
372316f1 PA |
1516 | } |
1517 | ||
e088209c | 1518 | /* Return true if the given thread is doing a displaced step. */ |
c0987663 | 1519 | |
e088209c SM |
1520 | static bool |
1521 | displaced_step_in_progress (thread_info *thread) | |
c0987663 | 1522 | { |
00431a78 | 1523 | gdb_assert (thread != NULL); |
c0987663 | 1524 | |
e088209c | 1525 | return get_displaced_stepping_state (thread)->in_progress (); |
c0987663 YQ |
1526 | } |
1527 | ||
e088209c | 1528 | /* Return true if any thread of this inferior is doing a displaced step. */ |
8f572e5c | 1529 | |
e088209c | 1530 | static bool |
00431a78 | 1531 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1532 | { |
e088209c SM |
1533 | for (thread_info *thread : inf->non_exited_threads ()) |
1534 | { | |
1535 | if (displaced_step_in_progress (thread)) | |
1536 | return true; | |
1537 | } | |
1538 | ||
1539 | return false; | |
1540 | } | |
1541 | ||
1542 | /* Return true if any thread is doing a displaced step. */ | |
1543 | ||
1544 | static bool | |
1545 | displaced_step_in_progress_any_thread () | |
1546 | { | |
1547 | for (thread_info *thread : all_non_exited_threads ()) | |
1548 | { | |
1549 | if (displaced_step_in_progress (thread)) | |
1550 | return true; | |
1551 | } | |
1552 | ||
1553 | return false; | |
fc1cf338 PA |
1554 | } |
1555 | ||
a42244db | 1556 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
588de28a | 1557 | of copy area, return corresponding displaced_step_copy_insn_closure. Otherwise, |
a42244db YQ |
1558 | return NULL. */ |
1559 | ||
588de28a SM |
1560 | struct displaced_step_copy_insn_closure * |
1561 | get_displaced_step_copy_insn_closure_by_addr (CORE_ADDR addr) | |
a42244db | 1562 | { |
e088209c SM |
1563 | // FIXME: implement me (only needed on ARM). |
1564 | // displaced_step_inferior_state *displaced | |
1565 | // = get_displaced_stepping_state (current_inferior ()); | |
1566 | // | |
1567 | // /* If checking the mode of displaced instruction in copy area. */ | |
1568 | // if (displaced->step_thread != nullptr | |
1569 | // && displaced->step_copy == addr) | |
1570 | // return displaced->step_closure.get (); | |
1571 | // | |
a42244db YQ |
1572 | return NULL; |
1573 | } | |
1574 | ||
fc1cf338 PA |
1575 | static void |
1576 | infrun_inferior_exit (struct inferior *inf) | |
1577 | { | |
d20172fc | 1578 | inf->displaced_step_state.reset (); |
fc1cf338 | 1579 | } |
237fc4c9 | 1580 | |
fff08868 HZ |
1581 | /* If ON, and the architecture supports it, GDB will use displaced |
1582 | stepping to step over breakpoints. If OFF, or if the architecture | |
1583 | doesn't support it, GDB will instead use the traditional | |
1584 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1585 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1586 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1587 | |
72d0e2c5 | 1588 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1589 | |
237fc4c9 PA |
1590 | static void |
1591 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1592 | struct cmd_list_element *c, | |
1593 | const char *value) | |
1594 | { | |
72d0e2c5 | 1595 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1596 | fprintf_filtered (file, |
1597 | _("Debugger's willingness to use displaced stepping " | |
1598 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1599 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1600 | else |
3e43a32a MS |
1601 | fprintf_filtered (file, |
1602 | _("Debugger's willingness to use displaced stepping " | |
1603 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1604 | } |
1605 | ||
65a7e4d6 | 1606 | /* Return true if the target behing THREAD supports displaced stepping. */ |
9822cb57 SM |
1607 | |
1608 | static bool | |
65a7e4d6 | 1609 | target_supports_displaced_stepping (thread_info *thread) |
9822cb57 | 1610 | { |
65a7e4d6 SM |
1611 | inferior *inf = thread->inf; |
1612 | target_ops *target = inf->top_target (); | |
1613 | ||
1614 | return target->supports_displaced_step (thread); | |
9822cb57 SM |
1615 | } |
1616 | ||
fff08868 | 1617 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1618 | over breakpoints of thread TP. */ |
fff08868 | 1619 | |
9822cb57 SM |
1620 | static bool |
1621 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1622 | { |
9822cb57 SM |
1623 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1624 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1625 | return false; | |
1626 | ||
1627 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1628 | way. */ | |
1629 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1630 | && !target_is_non_stop_p ()) | |
1631 | return false; | |
1632 | ||
65a7e4d6 SM |
1633 | /* If the target doesn't support displaced stepping, don't use it. */ |
1634 | if (!target_supports_displaced_stepping (tp)) | |
9822cb57 SM |
1635 | return false; |
1636 | ||
1637 | /* If recording, don't use displaced stepping. */ | |
1638 | if (find_record_target () != nullptr) | |
1639 | return false; | |
1640 | ||
d20172fc SM |
1641 | displaced_step_inferior_state *displaced_state |
1642 | = get_displaced_stepping_state (tp->inf); | |
3fc8eb30 | 1643 | |
9822cb57 SM |
1644 | /* If displaced stepping failed before for this inferior, don't bother trying |
1645 | again. */ | |
1646 | if (displaced_state->failed_before) | |
1647 | return false; | |
1648 | ||
1649 | return true; | |
237fc4c9 PA |
1650 | } |
1651 | ||
e088209c | 1652 | /* Simple function wrapper around displaced_step_thread_state::reset. */ |
d8d83535 | 1653 | |
237fc4c9 | 1654 | static void |
e088209c | 1655 | displaced_step_reset (displaced_step_thread_state *displaced) |
237fc4c9 | 1656 | { |
d8d83535 | 1657 | displaced->reset (); |
237fc4c9 PA |
1658 | } |
1659 | ||
d8d83535 SM |
1660 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1661 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1662 | ||
1663 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 PA |
1664 | |
1665 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1666 | void | |
1667 | displaced_step_dump_bytes (struct ui_file *file, | |
1668 | const gdb_byte *buf, | |
1669 | size_t len) | |
1670 | { | |
1671 | int i; | |
1672 | ||
1673 | for (i = 0; i < len; i++) | |
1674 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1675 | fputs_unfiltered ("\n", file); | |
1676 | } | |
1677 | ||
1678 | /* Prepare to single-step, using displaced stepping. | |
1679 | ||
1680 | Note that we cannot use displaced stepping when we have a signal to | |
1681 | deliver. If we have a signal to deliver and an instruction to step | |
1682 | over, then after the step, there will be no indication from the | |
1683 | target whether the thread entered a signal handler or ignored the | |
1684 | signal and stepped over the instruction successfully --- both cases | |
1685 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1686 | fixup, and in the second case we must --- but we can't tell which. | |
1687 | Comments in the code for 'random signals' in handle_inferior_event | |
1688 | explain how we handle this case instead. | |
1689 | ||
1690 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1691 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1692 | if this instruction can't be displaced stepped. */ | |
1693 | ||
e088209c | 1694 | static displaced_step_prepare_status |
00431a78 | 1695 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1696 | { |
00431a78 | 1697 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1698 | struct gdbarch *gdbarch = regcache->arch (); |
e088209c SM |
1699 | displaced_step_thread_state *thread_disp_step_state |
1700 | = get_displaced_stepping_state (tp); | |
237fc4c9 | 1701 | |
65a7e4d6 | 1702 | /* We should never reach this function if the target does not |
237fc4c9 | 1703 | support displaced stepping. */ |
65a7e4d6 | 1704 | gdb_assert (target_supports_displaced_stepping (tp)); |
237fc4c9 | 1705 | |
c2829269 PA |
1706 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1707 | gdb_assert (tp->control.trap_expected); | |
1708 | ||
c1e36e3e PA |
1709 | /* Disable range stepping while executing in the scratch pad. We |
1710 | want a single-step even if executing the displaced instruction in | |
1711 | the scratch buffer lands within the stepping range (e.g., a | |
1712 | jump/branch). */ | |
1713 | tp->control.may_range_step = 0; | |
1714 | ||
e088209c SM |
1715 | /* We are about to start a displaced step for this thread, if one is already |
1716 | in progress, we goofed up somewhere. */ | |
1717 | gdb_assert (!thread_disp_step_state->in_progress ()); | |
237fc4c9 | 1718 | |
e088209c | 1719 | scoped_restore_current_thread restore_thread; |
fc1cf338 | 1720 | |
e088209c SM |
1721 | switch_to_thread (tp); |
1722 | ||
1723 | CORE_ADDR original_pc = regcache_read_pc (regcache); | |
237fc4c9 | 1724 | |
e088209c | 1725 | displaced_step_prepare_status status = |
348a832d | 1726 | tp->inf->top_target ()->displaced_step_prepare (tp); |
e088209c SM |
1727 | |
1728 | if (status == DISPLACED_STEP_PREPARE_STATUS_ERROR) | |
1729 | { | |
237fc4c9 PA |
1730 | if (debug_displaced) |
1731 | fprintf_unfiltered (gdb_stdlog, | |
e088209c | 1732 | "displaced: failed to prepare (%s)", |
a068643d | 1733 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 | 1734 | |
e088209c | 1735 | return DISPLACED_STEP_PREPARE_STATUS_ERROR; |
237fc4c9 | 1736 | } |
e088209c | 1737 | else if (status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
237fc4c9 | 1738 | { |
e088209c SM |
1739 | /* Not enough displaced stepping resources available, defer this |
1740 | request by placing it the queue. */ | |
1741 | ||
237fc4c9 PA |
1742 | if (debug_displaced) |
1743 | fprintf_unfiltered (gdb_stdlog, | |
e088209c SM |
1744 | "displaced: not enough resources available, " |
1745 | "deferring step of %s\n", | |
a068643d | 1746 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 | 1747 | |
e088209c | 1748 | global_thread_step_over_chain_enqueue (tp); |
d6864985 | 1749 | tp->inf->displaced_step_state.unavailable = true; |
d35ae833 | 1750 | |
e088209c | 1751 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; |
d35ae833 PA |
1752 | } |
1753 | ||
e088209c SM |
1754 | gdb_assert (status == DISPLACED_STEP_PREPARE_STATUS_OK); |
1755 | ||
1756 | // FIXME: Should probably replicated in the arch implementation now. | |
1757 | // | |
1758 | // if (breakpoint_in_range_p (aspace, copy, len)) | |
1759 | // { | |
1760 | // /* There's a breakpoint set in the scratch pad location range | |
1761 | // (which is usually around the entry point). We'd either | |
1762 | // install it before resuming, which would overwrite/corrupt the | |
1763 | // scratch pad, or if it was already inserted, this displaced | |
1764 | // step would overwrite it. The latter is OK in the sense that | |
1765 | // we already assume that no thread is going to execute the code | |
1766 | // in the scratch pad range (after initial startup) anyway, but | |
1767 | // the former is unacceptable. Simply punt and fallback to | |
1768 | // stepping over this breakpoint in-line. */ | |
1769 | // if (debug_displaced) | |
1770 | // { | |
1771 | // fprintf_unfiltered (gdb_stdlog, | |
1772 | // "displaced: breakpoint set in scratch pad. " | |
1773 | // "Stepping over breakpoint in-line instead.\n"); | |
1774 | // } | |
1775 | // | |
1776 | // gdb_assert (false); | |
1777 | // gdbarch_displaced_step_release_location (gdbarch, copy); | |
1778 | // | |
1779 | // return -1; | |
1780 | // } | |
237fc4c9 | 1781 | |
9f5a595d UW |
1782 | /* Save the information we need to fix things up if the step |
1783 | succeeds. */ | |
e088209c | 1784 | thread_disp_step_state->set (gdbarch); |
237fc4c9 | 1785 | |
e088209c SM |
1786 | // FIXME: get it from _prepare? |
1787 | CORE_ADDR displaced_pc = 0; | |
ad53cd71 | 1788 | |
237fc4c9 | 1789 | if (debug_displaced) |
e088209c SM |
1790 | fprintf_unfiltered (gdb_stdlog, |
1791 | "displaced: prepared successfully thread=%s, " | |
1792 | "original_pc=%s, displaced_pc=%s\n", | |
1793 | target_pid_to_str (tp->ptid).c_str (), | |
1794 | paddress (gdbarch, original_pc), | |
1795 | paddress (gdbarch, displaced_pc)); | |
1796 | ||
1797 | return DISPLACED_STEP_PREPARE_STATUS_OK; | |
237fc4c9 PA |
1798 | } |
1799 | ||
3fc8eb30 PA |
1800 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1801 | attempts at displaced stepping if we get a memory error. */ | |
1802 | ||
e088209c | 1803 | static displaced_step_prepare_status |
00431a78 | 1804 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 | 1805 | { |
e088209c SM |
1806 | displaced_step_prepare_status status |
1807 | = DISPLACED_STEP_PREPARE_STATUS_ERROR; | |
3fc8eb30 | 1808 | |
a70b8144 | 1809 | try |
3fc8eb30 | 1810 | { |
e088209c | 1811 | status = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1812 | } |
230d2906 | 1813 | catch (const gdb_exception_error &ex) |
3fc8eb30 PA |
1814 | { |
1815 | struct displaced_step_inferior_state *displaced_state; | |
1816 | ||
16b41842 PA |
1817 | if (ex.error != MEMORY_ERROR |
1818 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1819 | throw; |
3fc8eb30 | 1820 | |
4100594e SM |
1821 | infrun_log_debug ("caught exception, disabling displaced stepping: %s", |
1822 | ex.what ()); | |
3fc8eb30 PA |
1823 | |
1824 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1825 | "auto". */ | |
1826 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1827 | { | |
fd7dcb94 | 1828 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1829 | ex.what ()); |
3fc8eb30 PA |
1830 | } |
1831 | ||
1832 | /* Disable further displaced stepping attempts. */ | |
1833 | displaced_state | |
00431a78 | 1834 | = get_displaced_stepping_state (thread->inf); |
3fc8eb30 PA |
1835 | displaced_state->failed_before = 1; |
1836 | } | |
3fc8eb30 | 1837 | |
e088209c | 1838 | return status; |
e2d96639 YQ |
1839 | } |
1840 | ||
372316f1 PA |
1841 | /* If we displaced stepped an instruction successfully, adjust |
1842 | registers and memory to yield the same effect the instruction would | |
1843 | have had if we had executed it at its original address, and return | |
1844 | 1. If the instruction didn't complete, relocate the PC and return | |
1845 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1846 | ||
1847 | static int | |
e088209c | 1848 | displaced_step_finish (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1849 | { |
e088209c SM |
1850 | displaced_step_thread_state *displaced |
1851 | = get_displaced_stepping_state (event_thread); | |
fc1cf338 | 1852 | |
e088209c SM |
1853 | /* Was this thread performing a displaced step? */ |
1854 | if (!displaced->in_progress ()) | |
372316f1 | 1855 | return 0; |
237fc4c9 | 1856 | |
e088209c SM |
1857 | displaced_step_reset_cleanup cleanup (displaced); |
1858 | ||
cb71640d PA |
1859 | /* Fixup may need to read memory/registers. Switch to the thread |
1860 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
d43b7a2d TBA |
1861 | the current thread, and displaced_step_restore performs ptid-dependent |
1862 | memory accesses using current_inferior() and current_top_target(). */ | |
00431a78 | 1863 | switch_to_thread (event_thread); |
cb71640d | 1864 | |
e088209c SM |
1865 | /* Do the fixup, and release the resources acquired to do the displaced |
1866 | step. */ | |
1867 | displaced_step_finish_status finish_status = | |
348a832d SM |
1868 | event_thread->inf->top_target ()->displaced_step_finish (event_thread, |
1869 | signal); | |
d43b7a2d | 1870 | |
e088209c SM |
1871 | if (finish_status == DISPLACED_STEP_FINISH_STATUS_OK) |
1872 | return 1; | |
237fc4c9 | 1873 | else |
e088209c | 1874 | return -1; |
c2829269 | 1875 | } |
1c5cfe86 | 1876 | |
4d9d9d04 PA |
1877 | /* Data to be passed around while handling an event. This data is |
1878 | discarded between events. */ | |
1879 | struct execution_control_state | |
1880 | { | |
5b6d1e4f | 1881 | process_stratum_target *target; |
4d9d9d04 PA |
1882 | ptid_t ptid; |
1883 | /* The thread that got the event, if this was a thread event; NULL | |
1884 | otherwise. */ | |
1885 | struct thread_info *event_thread; | |
1886 | ||
1887 | struct target_waitstatus ws; | |
1888 | int stop_func_filled_in; | |
1889 | CORE_ADDR stop_func_start; | |
1890 | CORE_ADDR stop_func_end; | |
1891 | const char *stop_func_name; | |
1892 | int wait_some_more; | |
1893 | ||
1894 | /* True if the event thread hit the single-step breakpoint of | |
1895 | another thread. Thus the event doesn't cause a stop, the thread | |
1896 | needs to be single-stepped past the single-step breakpoint before | |
1897 | we can switch back to the original stepping thread. */ | |
1898 | int hit_singlestep_breakpoint; | |
1899 | }; | |
1900 | ||
1901 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1902 | |
1903 | static void | |
4d9d9d04 PA |
1904 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1905 | { | |
1906 | memset (ecs, 0, sizeof (*ecs)); | |
1907 | ecs->event_thread = tp; | |
1908 | ecs->ptid = tp->ptid; | |
1909 | } | |
1910 | ||
1911 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1912 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 1913 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1914 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1915 | |
1916 | /* Are there any pending step-over requests? If so, run all we can | |
1917 | now and return true. Otherwise, return false. */ | |
1918 | ||
1919 | static int | |
c2829269 PA |
1920 | start_step_over (void) |
1921 | { | |
1922 | struct thread_info *tp, *next; | |
e088209c | 1923 | int started = 0; |
c2829269 | 1924 | |
372316f1 PA |
1925 | /* Don't start a new step-over if we already have an in-line |
1926 | step-over operation ongoing. */ | |
1927 | if (step_over_info_valid_p ()) | |
e088209c SM |
1928 | return started; |
1929 | ||
1930 | /* Steal the global thread step over chain. */ | |
1931 | thread_info *threads_to_step = global_thread_step_over_chain_head; | |
1932 | global_thread_step_over_chain_head = NULL; | |
1933 | ||
1934 | if (debug_infrun) | |
1935 | fprintf_unfiltered (gdb_stdlog, | |
1936 | "infrun: stealing list of %d threads to step from global queue\n", | |
1937 | thread_step_over_chain_length (threads_to_step)); | |
372316f1 | 1938 | |
d6864985 SM |
1939 | for (inferior *inf : all_inferiors ()) |
1940 | inf->displaced_step_state.unavailable = false; | |
1941 | ||
e088209c | 1942 | for (tp = threads_to_step; tp != NULL; tp = next) |
237fc4c9 | 1943 | { |
4d9d9d04 PA |
1944 | struct execution_control_state ecss; |
1945 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1946 | step_over_what step_what; |
372316f1 | 1947 | int must_be_in_line; |
c2829269 | 1948 | |
c65d6b55 PA |
1949 | gdb_assert (!tp->stop_requested); |
1950 | ||
e088209c | 1951 | next = thread_step_over_chain_next (threads_to_step, tp); |
c2829269 | 1952 | |
372316f1 PA |
1953 | step_what = thread_still_needs_step_over (tp); |
1954 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1955 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1956 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1957 | |
1958 | /* We currently stop all threads of all processes to step-over | |
1959 | in-line. If we need to start a new in-line step-over, let | |
1960 | any pending displaced steps finish first. */ | |
e088209c SM |
1961 | if (must_be_in_line && displaced_step_in_progress_any_thread ()) |
1962 | continue; | |
c2829269 | 1963 | |
e088209c | 1964 | thread_step_over_chain_remove (&threads_to_step, tp); |
c2829269 | 1965 | |
372316f1 PA |
1966 | if (tp->control.trap_expected |
1967 | || tp->resumed | |
1968 | || tp->executing) | |
ad53cd71 | 1969 | { |
4d9d9d04 PA |
1970 | internal_error (__FILE__, __LINE__, |
1971 | "[%s] has inconsistent state: " | |
372316f1 | 1972 | "trap_expected=%d, resumed=%d, executing=%d\n", |
a068643d | 1973 | target_pid_to_str (tp->ptid).c_str (), |
4d9d9d04 | 1974 | tp->control.trap_expected, |
372316f1 | 1975 | tp->resumed, |
4d9d9d04 | 1976 | tp->executing); |
ad53cd71 | 1977 | } |
1c5cfe86 | 1978 | |
4100594e SM |
1979 | infrun_log_debug ("resuming [%s] for step-over", |
1980 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 PA |
1981 | |
1982 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
1983 | is no longer inserted. In all-stop, we want to keep looking | |
1984 | for a thread that needs a step-over instead of resuming TP, | |
1985 | because we wouldn't be able to resume anything else until the | |
1986 | target stops again. In non-stop, the resume always resumes | |
1987 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 1988 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 1989 | continue; |
8550d3b3 | 1990 | |
d6864985 SM |
1991 | if (tp->inf->displaced_step_state.unavailable) |
1992 | { | |
1993 | global_thread_step_over_chain_enqueue (tp); | |
1994 | continue; | |
1995 | } | |
1996 | ||
00431a78 | 1997 | switch_to_thread (tp); |
4d9d9d04 PA |
1998 | reset_ecs (ecs, tp); |
1999 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2000 | |
4d9d9d04 PA |
2001 | if (!ecs->wait_some_more) |
2002 | error (_("Command aborted.")); | |
1c5cfe86 | 2003 | |
e088209c SM |
2004 | /* If the thread's step over could not be initiated, it was re-added |
2005 | to the global step over chain. */ | |
2006 | if (tp->resumed) | |
2007 | { | |
2008 | infrun_log_debug ("start_step_over: [%s] was resumed.\n", | |
2009 | target_pid_to_str (tp->ptid).c_str ()); | |
2010 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
2011 | } | |
2012 | else | |
2013 | { | |
2014 | infrun_log_debug ("infrun: start_step_over: [%s] was NOT resumed.\n", | |
2015 | target_pid_to_str (tp->ptid).c_str ()); | |
2016 | gdb_assert (thread_is_in_step_over_chain (tp)); | |
2017 | ||
2018 | } | |
372316f1 PA |
2019 | |
2020 | /* If we started a new in-line step-over, we're done. */ | |
2021 | if (step_over_info_valid_p ()) | |
2022 | { | |
2023 | gdb_assert (tp->control.trap_expected); | |
e088209c SM |
2024 | started = 1; |
2025 | break; | |
372316f1 PA |
2026 | } |
2027 | ||
fbea99ea | 2028 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2029 | { |
2030 | /* On all-stop, shouldn't have resumed unless we needed a | |
2031 | step over. */ | |
2032 | gdb_assert (tp->control.trap_expected | |
2033 | || tp->step_after_step_resume_breakpoint); | |
2034 | ||
2035 | /* With remote targets (at least), in all-stop, we can't | |
2036 | issue any further remote commands until the program stops | |
2037 | again. */ | |
e088209c SM |
2038 | started = 1; |
2039 | break; | |
1c5cfe86 | 2040 | } |
c2829269 | 2041 | |
4d9d9d04 PA |
2042 | /* Either the thread no longer needed a step-over, or a new |
2043 | displaced stepping sequence started. Even in the latter | |
2044 | case, continue looking. Maybe we can also start another | |
2045 | displaced step on a thread of other process. */ | |
237fc4c9 | 2046 | } |
4d9d9d04 | 2047 | |
e088209c SM |
2048 | /* If there are threads left in the THREADS_TO_STEP list, but we have |
2049 | detected that we can't start anything more, put back these threads | |
2050 | in the global list. */ | |
2051 | if (threads_to_step == NULL) | |
2052 | { | |
2053 | if (debug_infrun) | |
2054 | fprintf_unfiltered (gdb_stdlog, | |
2055 | "infrun: step-over queue now empty\n"); | |
2056 | } | |
2057 | else | |
2058 | { | |
2059 | if (debug_infrun) | |
2060 | fprintf_unfiltered (gdb_stdlog, | |
2061 | "infrun: putting back %d threads to step in global queue\n", | |
2062 | thread_step_over_chain_length (threads_to_step)); | |
2063 | while (threads_to_step != nullptr) | |
2064 | { | |
2065 | thread_info *thread = threads_to_step; | |
2066 | ||
2067 | /* Remove from that list. */ | |
2068 | thread_step_over_chain_remove (&threads_to_step, thread); | |
2069 | ||
2070 | /* Add to global list. */ | |
2071 | global_thread_step_over_chain_enqueue (thread); | |
2072 | ||
2073 | } | |
2074 | } | |
2075 | ||
2076 | return started; | |
237fc4c9 PA |
2077 | } |
2078 | ||
5231c1fd PA |
2079 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2080 | holding OLD_PTID. */ | |
2081 | static void | |
2082 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2083 | { | |
d7e15655 | 2084 | if (inferior_ptid == old_ptid) |
5231c1fd | 2085 | inferior_ptid = new_ptid; |
5231c1fd PA |
2086 | } |
2087 | ||
237fc4c9 | 2088 | \f |
c906108c | 2089 | |
53904c9e AC |
2090 | static const char schedlock_off[] = "off"; |
2091 | static const char schedlock_on[] = "on"; | |
2092 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2093 | static const char schedlock_replay[] = "replay"; |
40478521 | 2094 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2095 | schedlock_off, |
2096 | schedlock_on, | |
2097 | schedlock_step, | |
f2665db5 | 2098 | schedlock_replay, |
ef346e04 AC |
2099 | NULL |
2100 | }; | |
f2665db5 | 2101 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2102 | static void |
2103 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2104 | struct cmd_list_element *c, const char *value) | |
2105 | { | |
3e43a32a MS |
2106 | fprintf_filtered (file, |
2107 | _("Mode for locking scheduler " | |
2108 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2109 | value); |
2110 | } | |
c906108c SS |
2111 | |
2112 | static void | |
eb4c3f4a | 2113 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2114 | { |
eefe576e AC |
2115 | if (!target_can_lock_scheduler) |
2116 | { | |
2117 | scheduler_mode = schedlock_off; | |
2118 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2119 | } | |
c906108c SS |
2120 | } |
2121 | ||
d4db2f36 PA |
2122 | /* True if execution commands resume all threads of all processes by |
2123 | default; otherwise, resume only threads of the current inferior | |
2124 | process. */ | |
491144b5 | 2125 | bool sched_multi = false; |
d4db2f36 | 2126 | |
2facfe5c DD |
2127 | /* Try to setup for software single stepping over the specified location. |
2128 | Return 1 if target_resume() should use hardware single step. | |
2129 | ||
2130 | GDBARCH the current gdbarch. | |
2131 | PC the location to step over. */ | |
2132 | ||
2133 | static int | |
2134 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2135 | { | |
2136 | int hw_step = 1; | |
2137 | ||
f02253f1 | 2138 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2139 | && gdbarch_software_single_step_p (gdbarch)) |
2140 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2141 | ||
2facfe5c DD |
2142 | return hw_step; |
2143 | } | |
c906108c | 2144 | |
f3263aa4 PA |
2145 | /* See infrun.h. */ |
2146 | ||
09cee04b PA |
2147 | ptid_t |
2148 | user_visible_resume_ptid (int step) | |
2149 | { | |
f3263aa4 | 2150 | ptid_t resume_ptid; |
09cee04b | 2151 | |
09cee04b PA |
2152 | if (non_stop) |
2153 | { | |
2154 | /* With non-stop mode on, threads are always handled | |
2155 | individually. */ | |
2156 | resume_ptid = inferior_ptid; | |
2157 | } | |
2158 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2159 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2160 | { |
f3263aa4 PA |
2161 | /* User-settable 'scheduler' mode requires solo thread |
2162 | resume. */ | |
09cee04b PA |
2163 | resume_ptid = inferior_ptid; |
2164 | } | |
f2665db5 MM |
2165 | else if ((scheduler_mode == schedlock_replay) |
2166 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2167 | { | |
2168 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2169 | mode. */ | |
2170 | resume_ptid = inferior_ptid; | |
2171 | } | |
f3263aa4 PA |
2172 | else if (!sched_multi && target_supports_multi_process ()) |
2173 | { | |
2174 | /* Resume all threads of the current process (and none of other | |
2175 | processes). */ | |
e99b03dc | 2176 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2177 | } |
2178 | else | |
2179 | { | |
2180 | /* Resume all threads of all processes. */ | |
2181 | resume_ptid = RESUME_ALL; | |
2182 | } | |
09cee04b PA |
2183 | |
2184 | return resume_ptid; | |
2185 | } | |
2186 | ||
5b6d1e4f PA |
2187 | /* See infrun.h. */ |
2188 | ||
2189 | process_stratum_target * | |
2190 | user_visible_resume_target (ptid_t resume_ptid) | |
2191 | { | |
2192 | return (resume_ptid == minus_one_ptid && sched_multi | |
2193 | ? NULL | |
2194 | : current_inferior ()->process_target ()); | |
2195 | } | |
2196 | ||
fbea99ea PA |
2197 | /* Return a ptid representing the set of threads that we will resume, |
2198 | in the perspective of the target, assuming run control handling | |
2199 | does not require leaving some threads stopped (e.g., stepping past | |
2200 | breakpoint). USER_STEP indicates whether we're about to start the | |
2201 | target for a stepping command. */ | |
2202 | ||
2203 | static ptid_t | |
2204 | internal_resume_ptid (int user_step) | |
2205 | { | |
2206 | /* In non-stop, we always control threads individually. Note that | |
2207 | the target may always work in non-stop mode even with "set | |
2208 | non-stop off", in which case user_visible_resume_ptid could | |
2209 | return a wildcard ptid. */ | |
2210 | if (target_is_non_stop_p ()) | |
2211 | return inferior_ptid; | |
2212 | else | |
2213 | return user_visible_resume_ptid (user_step); | |
2214 | } | |
2215 | ||
64ce06e4 PA |
2216 | /* Wrapper for target_resume, that handles infrun-specific |
2217 | bookkeeping. */ | |
2218 | ||
2219 | static void | |
2220 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2221 | { | |
2222 | struct thread_info *tp = inferior_thread (); | |
2223 | ||
c65d6b55 PA |
2224 | gdb_assert (!tp->stop_requested); |
2225 | ||
64ce06e4 | 2226 | /* Install inferior's terminal modes. */ |
223ffa71 | 2227 | target_terminal::inferior (); |
64ce06e4 PA |
2228 | |
2229 | /* Avoid confusing the next resume, if the next stop/resume | |
2230 | happens to apply to another thread. */ | |
2231 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2232 | ||
8f572e5c PA |
2233 | /* Advise target which signals may be handled silently. |
2234 | ||
2235 | If we have removed breakpoints because we are stepping over one | |
2236 | in-line (in any thread), we need to receive all signals to avoid | |
2237 | accidentally skipping a breakpoint during execution of a signal | |
2238 | handler. | |
2239 | ||
2240 | Likewise if we're displaced stepping, otherwise a trap for a | |
2241 | breakpoint in a signal handler might be confused with the | |
2242 | displaced step finishing. We don't make the displaced_step_fixup | |
2243 | step distinguish the cases instead, because: | |
2244 | ||
2245 | - a backtrace while stopped in the signal handler would show the | |
2246 | scratch pad as frame older than the signal handler, instead of | |
2247 | the real mainline code. | |
2248 | ||
2249 | - when the thread is later resumed, the signal handler would | |
2250 | return to the scratch pad area, which would no longer be | |
2251 | valid. */ | |
2252 | if (step_over_info_valid_p () | |
00431a78 | 2253 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2254 | target_pass_signals ({}); |
64ce06e4 | 2255 | else |
adc6a863 | 2256 | target_pass_signals (signal_pass); |
64ce06e4 PA |
2257 | |
2258 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2259 | |
2260 | target_commit_resume (); | |
5b6d1e4f PA |
2261 | |
2262 | if (target_can_async_p ()) | |
2263 | target_async (1); | |
64ce06e4 PA |
2264 | } |
2265 | ||
d930703d | 2266 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2267 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2268 | call 'resume', which handles exceptions. */ | |
c906108c | 2269 | |
71d378ae PA |
2270 | static void |
2271 | resume_1 (enum gdb_signal sig) | |
c906108c | 2272 | { |
515630c5 | 2273 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2274 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2275 | struct thread_info *tp = inferior_thread (); |
8b86c959 | 2276 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2277 | ptid_t resume_ptid; |
856e7dd6 PA |
2278 | /* This represents the user's step vs continue request. When |
2279 | deciding whether "set scheduler-locking step" applies, it's the | |
2280 | user's intention that counts. */ | |
2281 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2282 | /* This represents what we'll actually request the target to do. |
2283 | This can decay from a step to a continue, if e.g., we need to | |
2284 | implement single-stepping with breakpoints (software | |
2285 | single-step). */ | |
6b403daa | 2286 | int step; |
c7e8a53c | 2287 | |
c65d6b55 | 2288 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2289 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2290 | ||
372316f1 PA |
2291 | if (tp->suspend.waitstatus_pending_p) |
2292 | { | |
4100594e SM |
2293 | infrun_log_debug |
2294 | ("thread %s has pending wait " | |
2295 | "status %s (currently_stepping=%d).", | |
2296 | target_pid_to_str (tp->ptid).c_str (), | |
2297 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2298 | currently_stepping (tp)); | |
372316f1 | 2299 | |
5b6d1e4f | 2300 | tp->inf->process_target ()->threads_executing = true; |
719546c4 | 2301 | tp->resumed = true; |
372316f1 PA |
2302 | |
2303 | /* FIXME: What should we do if we are supposed to resume this | |
2304 | thread with a signal? Maybe we should maintain a queue of | |
2305 | pending signals to deliver. */ | |
2306 | if (sig != GDB_SIGNAL_0) | |
2307 | { | |
fd7dcb94 | 2308 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d TT |
2309 | gdb_signal_to_name (sig), |
2310 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2311 | } |
2312 | ||
2313 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2314 | |
2315 | if (target_can_async_p ()) | |
9516f85a AB |
2316 | { |
2317 | target_async (1); | |
2318 | /* Tell the event loop we have an event to process. */ | |
2319 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2320 | } | |
372316f1 PA |
2321 | return; |
2322 | } | |
2323 | ||
2324 | tp->stepped_breakpoint = 0; | |
2325 | ||
6b403daa PA |
2326 | /* Depends on stepped_breakpoint. */ |
2327 | step = currently_stepping (tp); | |
2328 | ||
74609e71 YQ |
2329 | if (current_inferior ()->waiting_for_vfork_done) |
2330 | { | |
48f9886d PA |
2331 | /* Don't try to single-step a vfork parent that is waiting for |
2332 | the child to get out of the shared memory region (by exec'ing | |
2333 | or exiting). This is particularly important on software | |
2334 | single-step archs, as the child process would trip on the | |
2335 | software single step breakpoint inserted for the parent | |
2336 | process. Since the parent will not actually execute any | |
2337 | instruction until the child is out of the shared region (such | |
2338 | are vfork's semantics), it is safe to simply continue it. | |
2339 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2340 | the parent, and tell it to `keep_going', which automatically | |
2341 | re-sets it stepping. */ | |
4100594e | 2342 | infrun_log_debug ("resume : clear step"); |
a09dd441 | 2343 | step = 0; |
74609e71 YQ |
2344 | } |
2345 | ||
7ca9b62a TBA |
2346 | CORE_ADDR pc = regcache_read_pc (regcache); |
2347 | ||
4100594e SM |
2348 | infrun_log_debug ("step=%d, signal=%s, trap_expected=%d, " |
2349 | "current thread [%s] at %s", | |
2350 | step, gdb_signal_to_symbol_string (sig), | |
2351 | tp->control.trap_expected, | |
2352 | target_pid_to_str (inferior_ptid).c_str (), | |
2353 | paddress (gdbarch, pc)); | |
c906108c | 2354 | |
c2c6d25f JM |
2355 | /* Normally, by the time we reach `resume', the breakpoints are either |
2356 | removed or inserted, as appropriate. The exception is if we're sitting | |
2357 | at a permanent breakpoint; we need to step over it, but permanent | |
2358 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2359 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2360 | { |
af48d08f PA |
2361 | if (sig != GDB_SIGNAL_0) |
2362 | { | |
2363 | /* We have a signal to pass to the inferior. The resume | |
2364 | may, or may not take us to the signal handler. If this | |
2365 | is a step, we'll need to stop in the signal handler, if | |
2366 | there's one, (if the target supports stepping into | |
2367 | handlers), or in the next mainline instruction, if | |
2368 | there's no handler. If this is a continue, we need to be | |
2369 | sure to run the handler with all breakpoints inserted. | |
2370 | In all cases, set a breakpoint at the current address | |
2371 | (where the handler returns to), and once that breakpoint | |
2372 | is hit, resume skipping the permanent breakpoint. If | |
2373 | that breakpoint isn't hit, then we've stepped into the | |
2374 | signal handler (or hit some other event). We'll delete | |
2375 | the step-resume breakpoint then. */ | |
2376 | ||
4100594e SM |
2377 | infrun_log_debug ("resume: skipping permanent breakpoint, " |
2378 | "deliver signal first"); | |
af48d08f PA |
2379 | |
2380 | clear_step_over_info (); | |
2381 | tp->control.trap_expected = 0; | |
2382 | ||
2383 | if (tp->control.step_resume_breakpoint == NULL) | |
2384 | { | |
2385 | /* Set a "high-priority" step-resume, as we don't want | |
2386 | user breakpoints at PC to trigger (again) when this | |
2387 | hits. */ | |
2388 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2389 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2390 | ||
2391 | tp->step_after_step_resume_breakpoint = step; | |
2392 | } | |
2393 | ||
2394 | insert_breakpoints (); | |
2395 | } | |
2396 | else | |
2397 | { | |
2398 | /* There's no signal to pass, we can go ahead and skip the | |
2399 | permanent breakpoint manually. */ | |
4100594e | 2400 | infrun_log_debug ("skipping permanent breakpoint"); |
af48d08f PA |
2401 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); |
2402 | /* Update pc to reflect the new address from which we will | |
2403 | execute instructions. */ | |
2404 | pc = regcache_read_pc (regcache); | |
2405 | ||
2406 | if (step) | |
2407 | { | |
2408 | /* We've already advanced the PC, so the stepping part | |
2409 | is done. Now we need to arrange for a trap to be | |
2410 | reported to handle_inferior_event. Set a breakpoint | |
2411 | at the current PC, and run to it. Don't update | |
2412 | prev_pc, because if we end in | |
44a1ee51 PA |
2413 | switch_back_to_stepped_thread, we want the "expected |
2414 | thread advanced also" branch to be taken. IOW, we | |
2415 | don't want this thread to step further from PC | |
af48d08f | 2416 | (overstep). */ |
1ac806b8 | 2417 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2418 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2419 | insert_breakpoints (); | |
2420 | ||
fbea99ea | 2421 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2422 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
719546c4 | 2423 | tp->resumed = true; |
af48d08f PA |
2424 | return; |
2425 | } | |
2426 | } | |
6d350bb5 | 2427 | } |
c2c6d25f | 2428 | |
c1e36e3e PA |
2429 | /* If we have a breakpoint to step over, make sure to do a single |
2430 | step only. Same if we have software watchpoints. */ | |
2431 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2432 | tp->control.may_range_step = 0; | |
2433 | ||
7da6a5b9 LM |
2434 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2435 | copy of the instruction at a different address. | |
237fc4c9 PA |
2436 | |
2437 | We can't use displaced stepping when we have a signal to deliver; | |
2438 | the comments for displaced_step_prepare explain why. The | |
2439 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2440 | signals' explain what we do instead. |
2441 | ||
2442 | We can't use displaced stepping when we are waiting for vfork_done | |
2443 | event, displaced stepping breaks the vfork child similarly as single | |
2444 | step software breakpoint. */ | |
3fc8eb30 PA |
2445 | if (tp->control.trap_expected |
2446 | && use_displaced_stepping (tp) | |
cb71640d | 2447 | && !step_over_info_valid_p () |
a493e3e2 | 2448 | && sig == GDB_SIGNAL_0 |
74609e71 | 2449 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2450 | { |
e088209c SM |
2451 | displaced_step_prepare_status prepare_status |
2452 | = displaced_step_prepare (tp); | |
fc1cf338 | 2453 | |
e088209c | 2454 | if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
d56b7306 | 2455 | { |
4100594e | 2456 | infrun_log_debug ("Got placed in step-over queue"); |
4d9d9d04 PA |
2457 | |
2458 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2459 | return; |
2460 | } | |
e088209c | 2461 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_ERROR) |
3fc8eb30 PA |
2462 | { |
2463 | /* Fallback to stepping over the breakpoint in-line. */ | |
2464 | ||
2465 | if (target_is_non_stop_p ()) | |
2466 | stop_all_threads (); | |
2467 | ||
a01bda52 | 2468 | set_step_over_info (regcache->aspace (), |
21edc42f | 2469 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2470 | |
2471 | step = maybe_software_singlestep (gdbarch, pc); | |
2472 | ||
2473 | insert_breakpoints (); | |
2474 | } | |
e088209c | 2475 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_OK) |
3fc8eb30 | 2476 | { |
e088209c | 2477 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, NULL); |
3fc8eb30 | 2478 | } |
e088209c SM |
2479 | else |
2480 | gdb_assert_not_reached ("invalid displaced_step_prepare_status value"); | |
237fc4c9 PA |
2481 | } |
2482 | ||
2facfe5c | 2483 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2484 | else if (step) |
2facfe5c | 2485 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2486 | |
30852783 UW |
2487 | /* Currently, our software single-step implementation leads to different |
2488 | results than hardware single-stepping in one situation: when stepping | |
2489 | into delivering a signal which has an associated signal handler, | |
2490 | hardware single-step will stop at the first instruction of the handler, | |
2491 | while software single-step will simply skip execution of the handler. | |
2492 | ||
2493 | For now, this difference in behavior is accepted since there is no | |
2494 | easy way to actually implement single-stepping into a signal handler | |
2495 | without kernel support. | |
2496 | ||
2497 | However, there is one scenario where this difference leads to follow-on | |
2498 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2499 | and then single-stepping. In this case, the software single-step | |
2500 | behavior means that even if there is a *breakpoint* in the signal | |
2501 | handler, GDB still would not stop. | |
2502 | ||
2503 | Fortunately, we can at least fix this particular issue. We detect | |
2504 | here the case where we are about to deliver a signal while software | |
2505 | single-stepping with breakpoints removed. In this situation, we | |
2506 | revert the decisions to remove all breakpoints and insert single- | |
2507 | step breakpoints, and instead we install a step-resume breakpoint | |
2508 | at the current address, deliver the signal without stepping, and | |
2509 | once we arrive back at the step-resume breakpoint, actually step | |
2510 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2511 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2512 | && sig != GDB_SIGNAL_0 |
2513 | && step_over_info_valid_p ()) | |
30852783 UW |
2514 | { |
2515 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2516 | immediately after a handler returns, might already have |
30852783 UW |
2517 | a step-resume breakpoint set on the earlier handler. We cannot |
2518 | set another step-resume breakpoint; just continue on until the | |
2519 | original breakpoint is hit. */ | |
2520 | if (tp->control.step_resume_breakpoint == NULL) | |
2521 | { | |
2c03e5be | 2522 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2523 | tp->step_after_step_resume_breakpoint = 1; |
2524 | } | |
2525 | ||
34b7e8a6 | 2526 | delete_single_step_breakpoints (tp); |
30852783 | 2527 | |
31e77af2 | 2528 | clear_step_over_info (); |
30852783 | 2529 | tp->control.trap_expected = 0; |
31e77af2 PA |
2530 | |
2531 | insert_breakpoints (); | |
30852783 UW |
2532 | } |
2533 | ||
b0f16a3e SM |
2534 | /* If STEP is set, it's a request to use hardware stepping |
2535 | facilities. But in that case, we should never | |
2536 | use singlestep breakpoint. */ | |
34b7e8a6 | 2537 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2538 | |
fbea99ea | 2539 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2540 | if (tp->control.trap_expected) |
b0f16a3e SM |
2541 | { |
2542 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2543 | hit, either by single-stepping the thread with the breakpoint |
2544 | removed, or by displaced stepping, with the breakpoint inserted. | |
2545 | In the former case, we need to single-step only this thread, | |
2546 | and keep others stopped, as they can miss this breakpoint if | |
2547 | allowed to run. That's not really a problem for displaced | |
2548 | stepping, but, we still keep other threads stopped, in case | |
2549 | another thread is also stopped for a breakpoint waiting for | |
2550 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2551 | resume_ptid = inferior_ptid; |
2552 | } | |
fbea99ea PA |
2553 | else |
2554 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2555 | |
7f5ef605 PA |
2556 | if (execution_direction != EXEC_REVERSE |
2557 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2558 | { |
372316f1 PA |
2559 | /* There are two cases where we currently need to step a |
2560 | breakpoint instruction when we have a signal to deliver: | |
2561 | ||
2562 | - See handle_signal_stop where we handle random signals that | |
2563 | could take out us out of the stepping range. Normally, in | |
2564 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2565 | signal handler with a breakpoint at PC, but there are cases |
2566 | where we should _always_ single-step, even if we have a | |
2567 | step-resume breakpoint, like when a software watchpoint is | |
2568 | set. Assuming single-stepping and delivering a signal at the | |
2569 | same time would takes us to the signal handler, then we could | |
2570 | have removed the breakpoint at PC to step over it. However, | |
2571 | some hardware step targets (like e.g., Mac OS) can't step | |
2572 | into signal handlers, and for those, we need to leave the | |
2573 | breakpoint at PC inserted, as otherwise if the handler | |
2574 | recurses and executes PC again, it'll miss the breakpoint. | |
2575 | So we leave the breakpoint inserted anyway, but we need to | |
2576 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2577 | that adjust_pc_after_break doesn't end up confused. |
2578 | ||
2579 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2580 | in one thread after another thread that was stepping had been | |
2581 | momentarily paused for a step-over. When we re-resume the | |
2582 | stepping thread, it may be resumed from that address with a | |
2583 | breakpoint that hasn't trapped yet. Seen with | |
2584 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2585 | do displaced stepping. */ | |
2586 | ||
4100594e SM |
2587 | infrun_log_debug ("resume: [%s] stepped breakpoint", |
2588 | target_pid_to_str (tp->ptid).c_str ()); | |
7f5ef605 PA |
2589 | |
2590 | tp->stepped_breakpoint = 1; | |
2591 | ||
b0f16a3e SM |
2592 | /* Most targets can step a breakpoint instruction, thus |
2593 | executing it normally. But if this one cannot, just | |
2594 | continue and we will hit it anyway. */ | |
7f5ef605 | 2595 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2596 | step = 0; |
2597 | } | |
ef5cf84e | 2598 | |
b0f16a3e | 2599 | if (debug_displaced |
cb71640d | 2600 | && tp->control.trap_expected |
3fc8eb30 | 2601 | && use_displaced_stepping (tp) |
cb71640d | 2602 | && !step_over_info_valid_p ()) |
b0f16a3e | 2603 | { |
00431a78 | 2604 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2605 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2606 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2607 | gdb_byte buf[4]; | |
2608 | ||
2609 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2610 | paddress (resume_gdbarch, actual_pc)); | |
2611 | read_memory (actual_pc, buf, sizeof (buf)); | |
2612 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2613 | } | |
237fc4c9 | 2614 | |
b0f16a3e SM |
2615 | if (tp->control.may_range_step) |
2616 | { | |
2617 | /* If we're resuming a thread with the PC out of the step | |
2618 | range, then we're doing some nested/finer run control | |
2619 | operation, like stepping the thread out of the dynamic | |
2620 | linker or the displaced stepping scratch pad. We | |
2621 | shouldn't have allowed a range step then. */ | |
2622 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2623 | } | |
c1e36e3e | 2624 | |
64ce06e4 | 2625 | do_target_resume (resume_ptid, step, sig); |
719546c4 | 2626 | tp->resumed = true; |
c906108c | 2627 | } |
71d378ae PA |
2628 | |
2629 | /* Resume the inferior. SIG is the signal to give the inferior | |
2630 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2631 | rolls back state on error. */ | |
2632 | ||
aff4e175 | 2633 | static void |
71d378ae PA |
2634 | resume (gdb_signal sig) |
2635 | { | |
a70b8144 | 2636 | try |
71d378ae PA |
2637 | { |
2638 | resume_1 (sig); | |
2639 | } | |
230d2906 | 2640 | catch (const gdb_exception &ex) |
71d378ae PA |
2641 | { |
2642 | /* If resuming is being aborted for any reason, delete any | |
2643 | single-step breakpoint resume_1 may have created, to avoid | |
2644 | confusing the following resumption, and to avoid leaving | |
2645 | single-step breakpoints perturbing other threads, in case | |
2646 | we're running in non-stop mode. */ | |
2647 | if (inferior_ptid != null_ptid) | |
2648 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2649 | throw; |
71d378ae | 2650 | } |
71d378ae PA |
2651 | } |
2652 | ||
c906108c | 2653 | \f |
237fc4c9 | 2654 | /* Proceeding. */ |
c906108c | 2655 | |
4c2f2a79 PA |
2656 | /* See infrun.h. */ |
2657 | ||
2658 | /* Counter that tracks number of user visible stops. This can be used | |
2659 | to tell whether a command has proceeded the inferior past the | |
2660 | current location. This allows e.g., inferior function calls in | |
2661 | breakpoint commands to not interrupt the command list. When the | |
2662 | call finishes successfully, the inferior is standing at the same | |
2663 | breakpoint as if nothing happened (and so we don't call | |
2664 | normal_stop). */ | |
2665 | static ULONGEST current_stop_id; | |
2666 | ||
2667 | /* See infrun.h. */ | |
2668 | ||
2669 | ULONGEST | |
2670 | get_stop_id (void) | |
2671 | { | |
2672 | return current_stop_id; | |
2673 | } | |
2674 | ||
2675 | /* Called when we report a user visible stop. */ | |
2676 | ||
2677 | static void | |
2678 | new_stop_id (void) | |
2679 | { | |
2680 | current_stop_id++; | |
2681 | } | |
2682 | ||
c906108c SS |
2683 | /* Clear out all variables saying what to do when inferior is continued. |
2684 | First do this, then set the ones you want, then call `proceed'. */ | |
2685 | ||
a7212384 UW |
2686 | static void |
2687 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2688 | { |
4100594e | 2689 | infrun_log_debug ("%s", target_pid_to_str (tp->ptid).c_str ()); |
d6b48e9c | 2690 | |
372316f1 PA |
2691 | /* If we're starting a new sequence, then the previous finished |
2692 | single-step is no longer relevant. */ | |
2693 | if (tp->suspend.waitstatus_pending_p) | |
2694 | { | |
2695 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2696 | { | |
4100594e SM |
2697 | infrun_log_debug ("pending event of %s was a finished step. " |
2698 | "Discarding.", | |
2699 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2700 | |
2701 | tp->suspend.waitstatus_pending_p = 0; | |
2702 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2703 | } | |
4100594e | 2704 | else |
372316f1 | 2705 | { |
4100594e SM |
2706 | infrun_log_debug |
2707 | ("thread %s has pending wait status %s (currently_stepping=%d).", | |
2708 | target_pid_to_str (tp->ptid).c_str (), | |
2709 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2710 | currently_stepping (tp)); | |
372316f1 PA |
2711 | } |
2712 | } | |
2713 | ||
70509625 PA |
2714 | /* If this signal should not be seen by program, give it zero. |
2715 | Used for debugging signals. */ | |
2716 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2717 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2718 | ||
46e3ed7f | 2719 | delete tp->thread_fsm; |
243a9253 PA |
2720 | tp->thread_fsm = NULL; |
2721 | ||
16c381f0 JK |
2722 | tp->control.trap_expected = 0; |
2723 | tp->control.step_range_start = 0; | |
2724 | tp->control.step_range_end = 0; | |
c1e36e3e | 2725 | tp->control.may_range_step = 0; |
16c381f0 JK |
2726 | tp->control.step_frame_id = null_frame_id; |
2727 | tp->control.step_stack_frame_id = null_frame_id; | |
2728 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2729 | tp->control.step_start_function = NULL; |
a7212384 | 2730 | tp->stop_requested = 0; |
4e1c45ea | 2731 | |
16c381f0 | 2732 | tp->control.stop_step = 0; |
32400beb | 2733 | |
16c381f0 | 2734 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2735 | |
856e7dd6 | 2736 | tp->control.stepping_command = 0; |
17b2616c | 2737 | |
a7212384 | 2738 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2739 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2740 | } |
32400beb | 2741 | |
a7212384 | 2742 | void |
70509625 | 2743 | clear_proceed_status (int step) |
a7212384 | 2744 | { |
f2665db5 MM |
2745 | /* With scheduler-locking replay, stop replaying other threads if we're |
2746 | not replaying the user-visible resume ptid. | |
2747 | ||
2748 | This is a convenience feature to not require the user to explicitly | |
2749 | stop replaying the other threads. We're assuming that the user's | |
2750 | intent is to resume tracing the recorded process. */ | |
2751 | if (!non_stop && scheduler_mode == schedlock_replay | |
2752 | && target_record_is_replaying (minus_one_ptid) | |
2753 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2754 | execution_direction)) | |
2755 | target_record_stop_replaying (); | |
2756 | ||
08036331 | 2757 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2758 | { |
08036331 | 2759 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2760 | process_stratum_target *resume_target |
2761 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2762 | |
2763 | /* In all-stop mode, delete the per-thread status of all threads | |
2764 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2765 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2766 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2767 | } |
2768 | ||
d7e15655 | 2769 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2770 | { |
2771 | struct inferior *inferior; | |
2772 | ||
2773 | if (non_stop) | |
2774 | { | |
6c95b8df PA |
2775 | /* If in non-stop mode, only delete the per-thread status of |
2776 | the current thread. */ | |
a7212384 UW |
2777 | clear_proceed_status_thread (inferior_thread ()); |
2778 | } | |
6c95b8df | 2779 | |
d6b48e9c | 2780 | inferior = current_inferior (); |
16c381f0 | 2781 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2782 | } |
2783 | ||
76727919 | 2784 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2785 | } |
2786 | ||
99619bea PA |
2787 | /* Returns true if TP is still stopped at a breakpoint that needs |
2788 | stepping-over in order to make progress. If the breakpoint is gone | |
2789 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2790 | |
2791 | static int | |
6c4cfb24 | 2792 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2793 | { |
2794 | if (tp->stepping_over_breakpoint) | |
2795 | { | |
00431a78 | 2796 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2797 | |
a01bda52 | 2798 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2799 | regcache_read_pc (regcache)) |
2800 | == ordinary_breakpoint_here) | |
99619bea PA |
2801 | return 1; |
2802 | ||
2803 | tp->stepping_over_breakpoint = 0; | |
2804 | } | |
2805 | ||
2806 | return 0; | |
2807 | } | |
2808 | ||
6c4cfb24 PA |
2809 | /* Check whether thread TP still needs to start a step-over in order |
2810 | to make progress when resumed. Returns an bitwise or of enum | |
2811 | step_over_what bits, indicating what needs to be stepped over. */ | |
2812 | ||
8d297bbf | 2813 | static step_over_what |
6c4cfb24 PA |
2814 | thread_still_needs_step_over (struct thread_info *tp) |
2815 | { | |
8d297bbf | 2816 | step_over_what what = 0; |
6c4cfb24 PA |
2817 | |
2818 | if (thread_still_needs_step_over_bp (tp)) | |
2819 | what |= STEP_OVER_BREAKPOINT; | |
2820 | ||
2821 | if (tp->stepping_over_watchpoint | |
2822 | && !target_have_steppable_watchpoint) | |
2823 | what |= STEP_OVER_WATCHPOINT; | |
2824 | ||
2825 | return what; | |
2826 | } | |
2827 | ||
483805cf PA |
2828 | /* Returns true if scheduler locking applies. STEP indicates whether |
2829 | we're about to do a step/next-like command to a thread. */ | |
2830 | ||
2831 | static int | |
856e7dd6 | 2832 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2833 | { |
2834 | return (scheduler_mode == schedlock_on | |
2835 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2836 | && tp->control.stepping_command) |
2837 | || (scheduler_mode == schedlock_replay | |
2838 | && target_record_will_replay (minus_one_ptid, | |
2839 | execution_direction))); | |
483805cf PA |
2840 | } |
2841 | ||
5b6d1e4f PA |
2842 | /* Calls target_commit_resume on all targets. */ |
2843 | ||
2844 | static void | |
2845 | commit_resume_all_targets () | |
2846 | { | |
2847 | scoped_restore_current_thread restore_thread; | |
2848 | ||
2849 | /* Map between process_target and a representative inferior. This | |
2850 | is to avoid committing a resume in the same target more than | |
2851 | once. Resumptions must be idempotent, so this is an | |
2852 | optimization. */ | |
2853 | std::unordered_map<process_stratum_target *, inferior *> conn_inf; | |
2854 | ||
2855 | for (inferior *inf : all_non_exited_inferiors ()) | |
2856 | if (inf->has_execution ()) | |
2857 | conn_inf[inf->process_target ()] = inf; | |
2858 | ||
2859 | for (const auto &ci : conn_inf) | |
2860 | { | |
2861 | inferior *inf = ci.second; | |
2862 | switch_to_inferior_no_thread (inf); | |
2863 | target_commit_resume (); | |
2864 | } | |
2865 | } | |
2866 | ||
2f4fcf00 PA |
2867 | /* Check that all the targets we're about to resume are in non-stop |
2868 | mode. Ideally, we'd only care whether all targets support | |
2869 | target-async, but we're not there yet. E.g., stop_all_threads | |
2870 | doesn't know how to handle all-stop targets. Also, the remote | |
2871 | protocol in all-stop mode is synchronous, irrespective of | |
2872 | target-async, which means that things like a breakpoint re-set | |
2873 | triggered by one target would try to read memory from all targets | |
2874 | and fail. */ | |
2875 | ||
2876 | static void | |
2877 | check_multi_target_resumption (process_stratum_target *resume_target) | |
2878 | { | |
2879 | if (!non_stop && resume_target == nullptr) | |
2880 | { | |
2881 | scoped_restore_current_thread restore_thread; | |
2882 | ||
2883 | /* This is used to track whether we're resuming more than one | |
2884 | target. */ | |
2885 | process_stratum_target *first_connection = nullptr; | |
2886 | ||
2887 | /* The first inferior we see with a target that does not work in | |
2888 | always-non-stop mode. */ | |
2889 | inferior *first_not_non_stop = nullptr; | |
2890 | ||
2891 | for (inferior *inf : all_non_exited_inferiors (resume_target)) | |
2892 | { | |
2893 | switch_to_inferior_no_thread (inf); | |
2894 | ||
2895 | if (!target_has_execution) | |
2896 | continue; | |
2897 | ||
2898 | process_stratum_target *proc_target | |
2899 | = current_inferior ()->process_target(); | |
2900 | ||
2901 | if (!target_is_non_stop_p ()) | |
2902 | first_not_non_stop = inf; | |
2903 | ||
2904 | if (first_connection == nullptr) | |
2905 | first_connection = proc_target; | |
2906 | else if (first_connection != proc_target | |
2907 | && first_not_non_stop != nullptr) | |
2908 | { | |
2909 | switch_to_inferior_no_thread (first_not_non_stop); | |
2910 | ||
2911 | proc_target = current_inferior ()->process_target(); | |
2912 | ||
2913 | error (_("Connection %d (%s) does not support " | |
2914 | "multi-target resumption."), | |
2915 | proc_target->connection_number, | |
2916 | make_target_connection_string (proc_target).c_str ()); | |
2917 | } | |
2918 | } | |
2919 | } | |
2920 | } | |
2921 | ||
c906108c SS |
2922 | /* Basic routine for continuing the program in various fashions. |
2923 | ||
2924 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
2925 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
2926 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
2927 | |
2928 | You should call clear_proceed_status before calling proceed. */ | |
2929 | ||
2930 | void | |
64ce06e4 | 2931 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2932 | { |
e58b0e63 PA |
2933 | struct regcache *regcache; |
2934 | struct gdbarch *gdbarch; | |
e58b0e63 | 2935 | CORE_ADDR pc; |
4d9d9d04 PA |
2936 | struct execution_control_state ecss; |
2937 | struct execution_control_state *ecs = &ecss; | |
4d9d9d04 | 2938 | int started; |
c906108c | 2939 | |
e58b0e63 PA |
2940 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2941 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2942 | resuming the current thread. */ | |
2943 | if (!follow_fork ()) | |
2944 | { | |
2945 | /* The target for some reason decided not to resume. */ | |
2946 | normal_stop (); | |
f148b27e PA |
2947 | if (target_can_async_p ()) |
2948 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2949 | return; |
2950 | } | |
2951 | ||
842951eb PA |
2952 | /* We'll update this if & when we switch to a new thread. */ |
2953 | previous_inferior_ptid = inferior_ptid; | |
2954 | ||
e58b0e63 | 2955 | regcache = get_current_regcache (); |
ac7936df | 2956 | gdbarch = regcache->arch (); |
8b86c959 YQ |
2957 | const address_space *aspace = regcache->aspace (); |
2958 | ||
fc75c28b TBA |
2959 | pc = regcache_read_pc_protected (regcache); |
2960 | ||
08036331 | 2961 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 2962 | |
99619bea | 2963 | /* Fill in with reasonable starting values. */ |
08036331 | 2964 | init_thread_stepping_state (cur_thr); |
99619bea | 2965 | |
08036331 | 2966 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 2967 | |
5b6d1e4f PA |
2968 | ptid_t resume_ptid |
2969 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
2970 | process_stratum_target *resume_target | |
2971 | = user_visible_resume_target (resume_ptid); | |
2972 | ||
2f4fcf00 PA |
2973 | check_multi_target_resumption (resume_target); |
2974 | ||
2acceee2 | 2975 | if (addr == (CORE_ADDR) -1) |
c906108c | 2976 | { |
08036331 | 2977 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 2978 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 2979 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2980 | /* There is a breakpoint at the address we will resume at, |
2981 | step one instruction before inserting breakpoints so that | |
2982 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2983 | breakpoint). |
2984 | ||
2985 | Note, we don't do this in reverse, because we won't | |
2986 | actually be executing the breakpoint insn anyway. | |
2987 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 2988 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
2989 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2990 | && gdbarch_single_step_through_delay (gdbarch, | |
2991 | get_current_frame ())) | |
3352ef37 AC |
2992 | /* We stepped onto an instruction that needs to be stepped |
2993 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 2994 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
2995 | } |
2996 | else | |
2997 | { | |
515630c5 | 2998 | regcache_write_pc (regcache, addr); |
c906108c SS |
2999 | } |
3000 | ||
70509625 | 3001 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 3002 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 3003 | |
4d9d9d04 PA |
3004 | /* If an exception is thrown from this point on, make sure to |
3005 | propagate GDB's knowledge of the executing state to the | |
3006 | frontend/user running state. */ | |
5b6d1e4f | 3007 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
3008 | |
3009 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3010 | threads (e.g., we might need to set threads stepping over | |
3011 | breakpoints first), from the user/frontend's point of view, all | |
3012 | threads in RESUME_PTID are now running. Unless we're calling an | |
3013 | inferior function, as in that case we pretend the inferior | |
3014 | doesn't run at all. */ | |
08036331 | 3015 | if (!cur_thr->control.in_infcall) |
719546c4 | 3016 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3017 | |
4100594e SM |
3018 | infrun_log_debug ("addr=%s, signal=%s", paddress (gdbarch, addr), |
3019 | gdb_signal_to_symbol_string (siggnal)); | |
527159b7 | 3020 | |
4d9d9d04 PA |
3021 | annotate_starting (); |
3022 | ||
3023 | /* Make sure that output from GDB appears before output from the | |
3024 | inferior. */ | |
3025 | gdb_flush (gdb_stdout); | |
3026 | ||
d930703d PA |
3027 | /* Since we've marked the inferior running, give it the terminal. A |
3028 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3029 | still detect attempts to unblock a stuck connection with repeated | |
3030 | Ctrl-C from within target_pass_ctrlc). */ | |
3031 | target_terminal::inferior (); | |
3032 | ||
4d9d9d04 PA |
3033 | /* In a multi-threaded task we may select another thread and |
3034 | then continue or step. | |
3035 | ||
3036 | But if a thread that we're resuming had stopped at a breakpoint, | |
3037 | it will immediately cause another breakpoint stop without any | |
3038 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3039 | we must step over it first. | |
3040 | ||
3041 | Look for threads other than the current (TP) that reported a | |
3042 | breakpoint hit and haven't been resumed yet since. */ | |
3043 | ||
3044 | /* If scheduler locking applies, we can avoid iterating over all | |
3045 | threads. */ | |
08036331 | 3046 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3047 | { |
5b6d1e4f PA |
3048 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3049 | resume_ptid)) | |
08036331 | 3050 | { |
f3f8ece4 PA |
3051 | switch_to_thread_no_regs (tp); |
3052 | ||
4d9d9d04 PA |
3053 | /* Ignore the current thread here. It's handled |
3054 | afterwards. */ | |
08036331 | 3055 | if (tp == cur_thr) |
4d9d9d04 | 3056 | continue; |
c906108c | 3057 | |
4d9d9d04 PA |
3058 | if (!thread_still_needs_step_over (tp)) |
3059 | continue; | |
3060 | ||
3061 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3062 | |
4100594e SM |
3063 | infrun_log_debug ("need to step-over [%s] first", |
3064 | target_pid_to_str (tp->ptid).c_str ()); | |
99619bea | 3065 | |
bb88694d | 3066 | global_thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3067 | } |
f3f8ece4 PA |
3068 | |
3069 | switch_to_thread (cur_thr); | |
30852783 UW |
3070 | } |
3071 | ||
4d9d9d04 PA |
3072 | /* Enqueue the current thread last, so that we move all other |
3073 | threads over their breakpoints first. */ | |
08036331 | 3074 | if (cur_thr->stepping_over_breakpoint) |
bb88694d | 3075 | global_thread_step_over_chain_enqueue (cur_thr); |
30852783 | 3076 | |
4d9d9d04 PA |
3077 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3078 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3079 | advanced. Must do this before resuming any thread, as in | |
3080 | all-stop/remote, once we resume we can't send any other packet | |
3081 | until the target stops again. */ | |
fc75c28b | 3082 | cur_thr->prev_pc = regcache_read_pc_protected (regcache); |
99619bea | 3083 | |
a9bc57b9 TT |
3084 | { |
3085 | scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume (); | |
85ad3aaf | 3086 | |
a9bc57b9 | 3087 | started = start_step_over (); |
c906108c | 3088 | |
a9bc57b9 TT |
3089 | if (step_over_info_valid_p ()) |
3090 | { | |
3091 | /* Either this thread started a new in-line step over, or some | |
3092 | other thread was already doing one. In either case, don't | |
3093 | resume anything else until the step-over is finished. */ | |
3094 | } | |
3095 | else if (started && !target_is_non_stop_p ()) | |
3096 | { | |
3097 | /* A new displaced stepping sequence was started. In all-stop, | |
3098 | we can't talk to the target anymore until it next stops. */ | |
3099 | } | |
3100 | else if (!non_stop && target_is_non_stop_p ()) | |
3101 | { | |
3102 | /* In all-stop, but the target is always in non-stop mode. | |
3103 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3104 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3105 | resume_ptid)) | |
3106 | { | |
3107 | switch_to_thread_no_regs (tp); | |
3108 | ||
f9fac3c8 SM |
3109 | if (!tp->inf->has_execution ()) |
3110 | { | |
4100594e SM |
3111 | infrun_log_debug ("[%s] target has no execution", |
3112 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3113 | continue; |
3114 | } | |
f3f8ece4 | 3115 | |
f9fac3c8 SM |
3116 | if (tp->resumed) |
3117 | { | |
4100594e SM |
3118 | infrun_log_debug ("[%s] resumed", |
3119 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3120 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
3121 | continue; | |
3122 | } | |
fbea99ea | 3123 | |
f9fac3c8 SM |
3124 | if (thread_is_in_step_over_chain (tp)) |
3125 | { | |
4100594e SM |
3126 | infrun_log_debug ("[%s] needs step-over", |
3127 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3128 | continue; |
3129 | } | |
fbea99ea | 3130 | |
4100594e SM |
3131 | infrun_log_debug ("resuming %s", |
3132 | target_pid_to_str (tp->ptid).c_str ()); | |
fbea99ea | 3133 | |
f9fac3c8 SM |
3134 | reset_ecs (ecs, tp); |
3135 | switch_to_thread (tp); | |
3136 | keep_going_pass_signal (ecs); | |
3137 | if (!ecs->wait_some_more) | |
3138 | error (_("Command aborted.")); | |
3139 | } | |
a9bc57b9 | 3140 | } |
08036331 | 3141 | else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3142 | { |
3143 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3144 | reset_ecs (ecs, cur_thr); |
3145 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3146 | keep_going_pass_signal (ecs); |
3147 | if (!ecs->wait_some_more) | |
3148 | error (_("Command aborted.")); | |
3149 | } | |
3150 | } | |
c906108c | 3151 | |
5b6d1e4f | 3152 | commit_resume_all_targets (); |
85ad3aaf | 3153 | |
731f534f | 3154 | finish_state.release (); |
c906108c | 3155 | |
873657b9 PA |
3156 | /* If we've switched threads above, switch back to the previously |
3157 | current thread. We don't want the user to see a different | |
3158 | selected thread. */ | |
3159 | switch_to_thread (cur_thr); | |
3160 | ||
0b333c5e PA |
3161 | /* Tell the event loop to wait for it to stop. If the target |
3162 | supports asynchronous execution, it'll do this from within | |
3163 | target_resume. */ | |
362646f5 | 3164 | if (!target_can_async_p ()) |
0b333c5e | 3165 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3166 | } |
c906108c SS |
3167 | \f |
3168 | ||
3169 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3170 | |
c906108c | 3171 | void |
8621d6a9 | 3172 | start_remote (int from_tty) |
c906108c | 3173 | { |
5b6d1e4f PA |
3174 | inferior *inf = current_inferior (); |
3175 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3176 | |
1777feb0 | 3177 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3178 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3179 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3180 | nothing is returned (instead of just blocking). Because of this, |
3181 | targets expecting an immediate response need to, internally, set | |
3182 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3183 | timeout. */ |
6426a772 JM |
3184 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3185 | differentiate to its caller what the state of the target is after | |
3186 | the initial open has been performed. Here we're assuming that | |
3187 | the target has stopped. It should be possible to eventually have | |
3188 | target_open() return to the caller an indication that the target | |
3189 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3190 | for an async run. */ |
5b6d1e4f | 3191 | wait_for_inferior (inf); |
8621d6a9 DJ |
3192 | |
3193 | /* Now that the inferior has stopped, do any bookkeeping like | |
3194 | loading shared libraries. We want to do this before normal_stop, | |
3195 | so that the displayed frame is up to date. */ | |
8b88a78e | 3196 | post_create_inferior (current_top_target (), from_tty); |
8621d6a9 | 3197 | |
6426a772 | 3198 | normal_stop (); |
c906108c SS |
3199 | } |
3200 | ||
3201 | /* Initialize static vars when a new inferior begins. */ | |
3202 | ||
3203 | void | |
96baa820 | 3204 | init_wait_for_inferior (void) |
c906108c SS |
3205 | { |
3206 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3207 | |
c906108c SS |
3208 | breakpoint_init_inferior (inf_starting); |
3209 | ||
70509625 | 3210 | clear_proceed_status (0); |
9f976b41 | 3211 | |
ab1ddbcf | 3212 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3213 | |
842951eb | 3214 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3215 | } |
237fc4c9 | 3216 | |
c906108c | 3217 | \f |
488f131b | 3218 | |
ec9499be | 3219 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3220 | |
568d6575 UW |
3221 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3222 | struct execution_control_state *ecs); | |
3223 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3224 | struct execution_control_state *ecs); | |
4f5d7f63 | 3225 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3226 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3227 | struct frame_info *); |
611c83ae | 3228 | |
bdc36728 | 3229 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3230 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3231 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3232 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3233 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3234 | |
252fbfc8 PA |
3235 | /* This function is attached as a "thread_stop_requested" observer. |
3236 | Cleanup local state that assumed the PTID was to be resumed, and | |
3237 | report the stop to the frontend. */ | |
3238 | ||
2c0b251b | 3239 | static void |
252fbfc8 PA |
3240 | infrun_thread_stop_requested (ptid_t ptid) |
3241 | { | |
5b6d1e4f PA |
3242 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3243 | ||
c65d6b55 PA |
3244 | /* PTID was requested to stop. If the thread was already stopped, |
3245 | but the user/frontend doesn't know about that yet (e.g., the | |
3246 | thread had been temporarily paused for some step-over), set up | |
3247 | for reporting the stop now. */ | |
5b6d1e4f | 3248 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3249 | { |
3250 | if (tp->state != THREAD_RUNNING) | |
3251 | continue; | |
3252 | if (tp->executing) | |
3253 | continue; | |
c65d6b55 | 3254 | |
08036331 PA |
3255 | /* Remove matching threads from the step-over queue, so |
3256 | start_step_over doesn't try to resume them | |
3257 | automatically. */ | |
3258 | if (thread_is_in_step_over_chain (tp)) | |
bb88694d | 3259 | global_thread_step_over_chain_remove (tp); |
c65d6b55 | 3260 | |
08036331 PA |
3261 | /* If the thread is stopped, but the user/frontend doesn't |
3262 | know about that yet, queue a pending event, as if the | |
3263 | thread had just stopped now. Unless the thread already had | |
3264 | a pending event. */ | |
3265 | if (!tp->suspend.waitstatus_pending_p) | |
3266 | { | |
3267 | tp->suspend.waitstatus_pending_p = 1; | |
3268 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3269 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3270 | } | |
c65d6b55 | 3271 | |
08036331 PA |
3272 | /* Clear the inline-frame state, since we're re-processing the |
3273 | stop. */ | |
5b6d1e4f | 3274 | clear_inline_frame_state (tp); |
c65d6b55 | 3275 | |
08036331 PA |
3276 | /* If this thread was paused because some other thread was |
3277 | doing an inline-step over, let that finish first. Once | |
3278 | that happens, we'll restart all threads and consume pending | |
3279 | stop events then. */ | |
3280 | if (step_over_info_valid_p ()) | |
3281 | continue; | |
3282 | ||
3283 | /* Otherwise we can process the (new) pending event now. Set | |
3284 | it so this pending event is considered by | |
3285 | do_target_wait. */ | |
719546c4 | 3286 | tp->resumed = true; |
08036331 | 3287 | } |
252fbfc8 PA |
3288 | } |
3289 | ||
a07daef3 PA |
3290 | static void |
3291 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3292 | { | |
5b6d1e4f PA |
3293 | if (target_last_proc_target == tp->inf->process_target () |
3294 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3295 | nullify_last_target_wait_ptid (); |
3296 | } | |
3297 | ||
0cbcdb96 PA |
3298 | /* Delete the step resume, single-step and longjmp/exception resume |
3299 | breakpoints of TP. */ | |
4e1c45ea | 3300 | |
0cbcdb96 PA |
3301 | static void |
3302 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3303 | { |
0cbcdb96 PA |
3304 | delete_step_resume_breakpoint (tp); |
3305 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3306 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3307 | } |
3308 | ||
0cbcdb96 PA |
3309 | /* If the target still has execution, call FUNC for each thread that |
3310 | just stopped. In all-stop, that's all the non-exited threads; in | |
3311 | non-stop, that's the current thread, only. */ | |
3312 | ||
3313 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3314 | (struct thread_info *tp); | |
4e1c45ea PA |
3315 | |
3316 | static void | |
0cbcdb96 | 3317 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3318 | { |
d7e15655 | 3319 | if (!target_has_execution || inferior_ptid == null_ptid) |
4e1c45ea PA |
3320 | return; |
3321 | ||
fbea99ea | 3322 | if (target_is_non_stop_p ()) |
4e1c45ea | 3323 | { |
0cbcdb96 PA |
3324 | /* If in non-stop mode, only the current thread stopped. */ |
3325 | func (inferior_thread ()); | |
4e1c45ea PA |
3326 | } |
3327 | else | |
0cbcdb96 | 3328 | { |
0cbcdb96 | 3329 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3330 | for (thread_info *tp : all_non_exited_threads ()) |
3331 | func (tp); | |
0cbcdb96 PA |
3332 | } |
3333 | } | |
3334 | ||
3335 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3336 | the threads that just stopped. */ | |
3337 | ||
3338 | static void | |
3339 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3340 | { | |
3341 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3342 | } |
3343 | ||
3344 | /* Delete the single-step breakpoints of the threads that just | |
3345 | stopped. */ | |
7c16b83e | 3346 | |
34b7e8a6 PA |
3347 | static void |
3348 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3349 | { | |
3350 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3351 | } |
3352 | ||
221e1a37 | 3353 | /* See infrun.h. */ |
223698f8 | 3354 | |
221e1a37 | 3355 | void |
223698f8 DE |
3356 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3357 | const struct target_waitstatus *ws) | |
3358 | { | |
23fdd69e | 3359 | std::string status_string = target_waitstatus_to_string (ws); |
d7e74731 | 3360 | string_file stb; |
223698f8 DE |
3361 | |
3362 | /* The text is split over several lines because it was getting too long. | |
3363 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3364 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3365 | is set. */ | |
3366 | ||
d7e74731 | 3367 | stb.printf ("infrun: target_wait (%d.%ld.%ld", |
e99b03dc | 3368 | waiton_ptid.pid (), |
e38504b3 | 3369 | waiton_ptid.lwp (), |
cc6bcb54 | 3370 | waiton_ptid.tid ()); |
e99b03dc | 3371 | if (waiton_ptid.pid () != -1) |
a068643d | 3372 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid).c_str ()); |
d7e74731 PA |
3373 | stb.printf (", status) =\n"); |
3374 | stb.printf ("infrun: %d.%ld.%ld [%s],\n", | |
e99b03dc | 3375 | result_ptid.pid (), |
e38504b3 | 3376 | result_ptid.lwp (), |
cc6bcb54 | 3377 | result_ptid.tid (), |
a068643d | 3378 | target_pid_to_str (result_ptid).c_str ()); |
23fdd69e | 3379 | stb.printf ("infrun: %s\n", status_string.c_str ()); |
223698f8 DE |
3380 | |
3381 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3382 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3383 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3384 | } |
3385 | ||
372316f1 PA |
3386 | /* Select a thread at random, out of those which are resumed and have |
3387 | had events. */ | |
3388 | ||
3389 | static struct thread_info * | |
5b6d1e4f | 3390 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3391 | { |
372316f1 | 3392 | int num_events = 0; |
08036331 | 3393 | |
5b6d1e4f | 3394 | auto has_event = [&] (thread_info *tp) |
08036331 | 3395 | { |
5b6d1e4f PA |
3396 | return (tp->ptid.matches (waiton_ptid) |
3397 | && tp->resumed | |
08036331 PA |
3398 | && tp->suspend.waitstatus_pending_p); |
3399 | }; | |
372316f1 PA |
3400 | |
3401 | /* First see how many events we have. Count only resumed threads | |
3402 | that have an event pending. */ | |
5b6d1e4f | 3403 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3404 | if (has_event (tp)) |
372316f1 PA |
3405 | num_events++; |
3406 | ||
3407 | if (num_events == 0) | |
3408 | return NULL; | |
3409 | ||
3410 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3411 | int random_selector = (int) ((num_events * (double) rand ()) |
3412 | / (RAND_MAX + 1.0)); | |
372316f1 | 3413 | |
4100594e SM |
3414 | if (num_events > 1) |
3415 | infrun_log_debug ("Found %d events, selecting #%d", | |
3416 | num_events, random_selector); | |
372316f1 PA |
3417 | |
3418 | /* Select the Nth thread that has had an event. */ | |
5b6d1e4f | 3419 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3420 | if (has_event (tp)) |
372316f1 | 3421 | if (random_selector-- == 0) |
08036331 | 3422 | return tp; |
372316f1 | 3423 | |
08036331 | 3424 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3425 | } |
3426 | ||
3427 | /* Wrapper for target_wait that first checks whether threads have | |
3428 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3429 | more events. INF is the inferior we're using to call target_wait |
3430 | on. */ | |
372316f1 PA |
3431 | |
3432 | static ptid_t | |
5b6d1e4f PA |
3433 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
3434 | target_waitstatus *status, int options) | |
372316f1 PA |
3435 | { |
3436 | ptid_t event_ptid; | |
3437 | struct thread_info *tp; | |
3438 | ||
24ed6739 AB |
3439 | /* We know that we are looking for an event in the target of inferior |
3440 | INF, but we don't know which thread the event might come from. As | |
3441 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3442 | the wait code relies on it - doing so is always a mistake. */ | |
3443 | switch_to_inferior_no_thread (inf); | |
3444 | ||
372316f1 PA |
3445 | /* First check if there is a resumed thread with a wait status |
3446 | pending. */ | |
d7e15655 | 3447 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3448 | { |
5b6d1e4f | 3449 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3450 | } |
3451 | else | |
3452 | { | |
4100594e SM |
3453 | infrun_log_debug ("Waiting for specific thread %s.", |
3454 | target_pid_to_str (ptid).c_str ()); | |
372316f1 PA |
3455 | |
3456 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3457 | tp = find_thread_ptid (inf, ptid); |
372316f1 PA |
3458 | gdb_assert (tp != NULL); |
3459 | if (!tp->suspend.waitstatus_pending_p) | |
3460 | tp = NULL; | |
3461 | } | |
3462 | ||
3463 | if (tp != NULL | |
3464 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3465 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3466 | { | |
00431a78 | 3467 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3468 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3469 | CORE_ADDR pc; |
3470 | int discard = 0; | |
3471 | ||
3472 | pc = regcache_read_pc (regcache); | |
3473 | ||
3474 | if (pc != tp->suspend.stop_pc) | |
3475 | { | |
4100594e SM |
3476 | infrun_log_debug ("PC of %s changed. was=%s, now=%s", |
3477 | target_pid_to_str (tp->ptid).c_str (), | |
3478 | paddress (gdbarch, tp->suspend.stop_pc), | |
3479 | paddress (gdbarch, pc)); | |
372316f1 PA |
3480 | discard = 1; |
3481 | } | |
a01bda52 | 3482 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 | 3483 | { |
4100594e SM |
3484 | infrun_log_debug ("previous breakpoint of %s, at %s gone", |
3485 | target_pid_to_str (tp->ptid).c_str (), | |
3486 | paddress (gdbarch, pc)); | |
372316f1 PA |
3487 | |
3488 | discard = 1; | |
3489 | } | |
3490 | ||
3491 | if (discard) | |
3492 | { | |
4100594e SM |
3493 | infrun_log_debug ("pending event of %s cancelled.", |
3494 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3495 | |
3496 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3497 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3498 | } | |
3499 | } | |
3500 | ||
3501 | if (tp != NULL) | |
3502 | { | |
4100594e SM |
3503 | infrun_log_debug ("Using pending wait status %s for %s.", |
3504 | target_waitstatus_to_string | |
3505 | (&tp->suspend.waitstatus).c_str (), | |
3506 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3507 | |
3508 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3509 | if it was a software breakpoint (and the target doesn't | |
3510 | always adjust the PC itself). */ | |
3511 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3512 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3513 | { | |
3514 | struct regcache *regcache; | |
3515 | struct gdbarch *gdbarch; | |
3516 | int decr_pc; | |
3517 | ||
00431a78 | 3518 | regcache = get_thread_regcache (tp); |
ac7936df | 3519 | gdbarch = regcache->arch (); |
372316f1 PA |
3520 | |
3521 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3522 | if (decr_pc != 0) | |
3523 | { | |
3524 | CORE_ADDR pc; | |
3525 | ||
3526 | pc = regcache_read_pc (regcache); | |
3527 | regcache_write_pc (regcache, pc + decr_pc); | |
3528 | } | |
3529 | } | |
3530 | ||
3531 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3532 | *status = tp->suspend.waitstatus; | |
3533 | tp->suspend.waitstatus_pending_p = 0; | |
3534 | ||
3535 | /* Wake up the event loop again, until all pending events are | |
3536 | processed. */ | |
3537 | if (target_is_async_p ()) | |
3538 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3539 | return tp->ptid; | |
3540 | } | |
3541 | ||
3542 | /* But if we don't find one, we'll have to wait. */ | |
3543 | ||
3544 | if (deprecated_target_wait_hook) | |
3545 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3546 | else | |
3547 | event_ptid = target_wait (ptid, status, options); | |
3548 | ||
3549 | return event_ptid; | |
3550 | } | |
3551 | ||
5b6d1e4f PA |
3552 | /* Returns true if INF has any resumed thread with a status |
3553 | pending. */ | |
3554 | ||
3555 | static bool | |
3556 | threads_are_resumed_pending_p (inferior *inf) | |
3557 | { | |
3558 | for (thread_info *tp : inf->non_exited_threads ()) | |
3559 | if (tp->resumed | |
3560 | && tp->suspend.waitstatus_pending_p) | |
3561 | return true; | |
3562 | ||
3563 | return false; | |
3564 | } | |
3565 | ||
3566 | /* Wrapper for target_wait that first checks whether threads have | |
3567 | pending statuses to report before actually asking the target for | |
3568 | more events. Polls for events from all inferiors/targets. */ | |
3569 | ||
3570 | static bool | |
3571 | do_target_wait (ptid_t wait_ptid, execution_control_state *ecs, int options) | |
3572 | { | |
3573 | int num_inferiors = 0; | |
3574 | int random_selector; | |
3575 | ||
3576 | /* For fairness, we pick the first inferior/target to poll at | |
3577 | random, and then continue polling the rest of the inferior list | |
3578 | starting from that one in a circular fashion until the whole list | |
3579 | is polled once. */ | |
3580 | ||
3581 | auto inferior_matches = [&wait_ptid] (inferior *inf) | |
3582 | { | |
3583 | return (inf->process_target () != NULL | |
3584 | && (threads_are_executing (inf->process_target ()) | |
3585 | || threads_are_resumed_pending_p (inf)) | |
3586 | && ptid_t (inf->pid).matches (wait_ptid)); | |
3587 | }; | |
3588 | ||
3589 | /* First see how many resumed inferiors we have. */ | |
3590 | for (inferior *inf : all_inferiors ()) | |
3591 | if (inferior_matches (inf)) | |
3592 | num_inferiors++; | |
3593 | ||
3594 | if (num_inferiors == 0) | |
3595 | { | |
3596 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3597 | return false; | |
3598 | } | |
3599 | ||
3600 | /* Now randomly pick an inferior out of those that were resumed. */ | |
3601 | random_selector = (int) | |
3602 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3603 | ||
4100594e SM |
3604 | if (num_inferiors > 1) |
3605 | infrun_log_debug ("Found %d inferiors, starting at #%d", | |
3606 | num_inferiors, random_selector); | |
5b6d1e4f PA |
3607 | |
3608 | /* Select the Nth inferior that was resumed. */ | |
3609 | ||
3610 | inferior *selected = nullptr; | |
3611 | ||
3612 | for (inferior *inf : all_inferiors ()) | |
3613 | if (inferior_matches (inf)) | |
3614 | if (random_selector-- == 0) | |
3615 | { | |
3616 | selected = inf; | |
3617 | break; | |
3618 | } | |
3619 | ||
3620 | /* Now poll for events out of each of the resumed inferior's | |
3621 | targets, starting from the selected one. */ | |
3622 | ||
3623 | auto do_wait = [&] (inferior *inf) | |
3624 | { | |
5b6d1e4f PA |
3625 | ecs->ptid = do_target_wait_1 (inf, wait_ptid, &ecs->ws, options); |
3626 | ecs->target = inf->process_target (); | |
3627 | return (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3628 | }; | |
3629 | ||
3630 | /* Needed in all-stop+target-non-stop mode, because we end up here | |
3631 | spuriously after the target is all stopped and we've already | |
3632 | reported the stop to the user, polling for events. */ | |
3633 | scoped_restore_current_thread restore_thread; | |
3634 | ||
3635 | int inf_num = selected->num; | |
3636 | for (inferior *inf = selected; inf != NULL; inf = inf->next) | |
3637 | if (inferior_matches (inf)) | |
3638 | if (do_wait (inf)) | |
3639 | return true; | |
3640 | ||
3641 | for (inferior *inf = inferior_list; | |
3642 | inf != NULL && inf->num < inf_num; | |
3643 | inf = inf->next) | |
3644 | if (inferior_matches (inf)) | |
3645 | if (do_wait (inf)) | |
3646 | return true; | |
3647 | ||
3648 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3649 | return false; | |
3650 | } | |
3651 | ||
24291992 PA |
3652 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3653 | detaching while a thread is displaced stepping is a recipe for | |
3654 | crashing it, as nothing would readjust the PC out of the scratch | |
3655 | pad. */ | |
3656 | ||
3657 | void | |
3658 | prepare_for_detach (void) | |
3659 | { | |
3660 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3661 | ptid_t pid_ptid = ptid_t (inf->pid); |
24291992 | 3662 | |
e088209c | 3663 | // displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf); |
24291992 PA |
3664 | |
3665 | /* Is any thread of this process displaced stepping? If not, | |
3666 | there's nothing else to do. */ | |
e088209c | 3667 | if (displaced_step_in_progress (inf)) |
24291992 PA |
3668 | return; |
3669 | ||
4100594e | 3670 | infrun_log_debug ("displaced-stepping in-process while detaching"); |
24291992 | 3671 | |
9bcb1f16 | 3672 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3673 | |
e088209c SM |
3674 | // FIXME |
3675 | while (false) | |
24291992 | 3676 | { |
24291992 PA |
3677 | struct execution_control_state ecss; |
3678 | struct execution_control_state *ecs; | |
3679 | ||
3680 | ecs = &ecss; | |
3681 | memset (ecs, 0, sizeof (*ecs)); | |
3682 | ||
3683 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3684 | /* Flush target cache before starting to handle each event. |
3685 | Target was running and cache could be stale. This is just a | |
3686 | heuristic. Running threads may modify target memory, but we | |
3687 | don't get any event. */ | |
3688 | target_dcache_invalidate (); | |
24291992 | 3689 | |
5b6d1e4f | 3690 | do_target_wait (pid_ptid, ecs, 0); |
24291992 PA |
3691 | |
3692 | if (debug_infrun) | |
3693 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3694 | ||
3695 | /* If an error happens while handling the event, propagate GDB's | |
3696 | knowledge of the executing state to the frontend/user running | |
3697 | state. */ | |
5b6d1e4f PA |
3698 | scoped_finish_thread_state finish_state (inf->process_target (), |
3699 | minus_one_ptid); | |
24291992 PA |
3700 | |
3701 | /* Now figure out what to do with the result of the result. */ | |
3702 | handle_inferior_event (ecs); | |
3703 | ||
3704 | /* No error, don't finish the state yet. */ | |
731f534f | 3705 | finish_state.release (); |
24291992 PA |
3706 | |
3707 | /* Breakpoints and watchpoints are not installed on the target | |
3708 | at this point, and signals are passed directly to the | |
3709 | inferior, so this must mean the process is gone. */ | |
3710 | if (!ecs->wait_some_more) | |
3711 | { | |
9bcb1f16 | 3712 | restore_detaching.release (); |
24291992 PA |
3713 | error (_("Program exited while detaching")); |
3714 | } | |
3715 | } | |
3716 | ||
9bcb1f16 | 3717 | restore_detaching.release (); |
24291992 PA |
3718 | } |
3719 | ||
cd0fc7c3 | 3720 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3721 | |
cd0fc7c3 SS |
3722 | If inferior gets a signal, we may decide to start it up again |
3723 | instead of returning. That is why there is a loop in this function. | |
3724 | When this function actually returns it means the inferior | |
3725 | should be left stopped and GDB should read more commands. */ | |
3726 | ||
5b6d1e4f PA |
3727 | static void |
3728 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3729 | { |
4100594e | 3730 | infrun_log_debug ("wait_for_inferior ()"); |
527159b7 | 3731 | |
4c41382a | 3732 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3733 | |
e6f5c25b PA |
3734 | /* If an error happens while handling the event, propagate GDB's |
3735 | knowledge of the executing state to the frontend/user running | |
3736 | state. */ | |
5b6d1e4f PA |
3737 | scoped_finish_thread_state finish_state |
3738 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 3739 | |
c906108c SS |
3740 | while (1) |
3741 | { | |
ae25568b PA |
3742 | struct execution_control_state ecss; |
3743 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 3744 | |
ae25568b PA |
3745 | memset (ecs, 0, sizeof (*ecs)); |
3746 | ||
ec9499be | 3747 | overlay_cache_invalid = 1; |
ec9499be | 3748 | |
f15cb84a YQ |
3749 | /* Flush target cache before starting to handle each event. |
3750 | Target was running and cache could be stale. This is just a | |
3751 | heuristic. Running threads may modify target memory, but we | |
3752 | don't get any event. */ | |
3753 | target_dcache_invalidate (); | |
3754 | ||
5b6d1e4f PA |
3755 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
3756 | ecs->target = inf->process_target (); | |
c906108c | 3757 | |
f00150c9 | 3758 | if (debug_infrun) |
5b6d1e4f | 3759 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3760 | |
cd0fc7c3 SS |
3761 | /* Now figure out what to do with the result of the result. */ |
3762 | handle_inferior_event (ecs); | |
c906108c | 3763 | |
cd0fc7c3 SS |
3764 | if (!ecs->wait_some_more) |
3765 | break; | |
3766 | } | |
4e1c45ea | 3767 | |
e6f5c25b | 3768 | /* No error, don't finish the state yet. */ |
731f534f | 3769 | finish_state.release (); |
cd0fc7c3 | 3770 | } |
c906108c | 3771 | |
d3d4baed PA |
3772 | /* Cleanup that reinstalls the readline callback handler, if the |
3773 | target is running in the background. If while handling the target | |
3774 | event something triggered a secondary prompt, like e.g., a | |
3775 | pagination prompt, we'll have removed the callback handler (see | |
3776 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3777 | event loop, ready to process further input. Note this has no | |
3778 | effect if the handler hasn't actually been removed, because calling | |
3779 | rl_callback_handler_install resets the line buffer, thus losing | |
3780 | input. */ | |
3781 | ||
3782 | static void | |
d238133d | 3783 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 3784 | { |
3b12939d PA |
3785 | struct ui *ui = current_ui; |
3786 | ||
3787 | if (!ui->async) | |
6c400b59 PA |
3788 | { |
3789 | /* We're not going back to the top level event loop yet. Don't | |
3790 | install the readline callback, as it'd prep the terminal, | |
3791 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3792 | it the next time the prompt is displayed, when we're ready | |
3793 | for input. */ | |
3794 | return; | |
3795 | } | |
3796 | ||
3b12939d | 3797 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3798 | gdb_rl_callback_handler_reinstall (); |
3799 | } | |
3800 | ||
243a9253 PA |
3801 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3802 | that's just the event thread. In all-stop, that's all threads. */ | |
3803 | ||
3804 | static void | |
3805 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3806 | { | |
08036331 PA |
3807 | if (ecs->event_thread != NULL |
3808 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 3809 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
3810 | |
3811 | if (!non_stop) | |
3812 | { | |
08036331 | 3813 | for (thread_info *thr : all_non_exited_threads ()) |
243a9253 PA |
3814 | { |
3815 | if (thr->thread_fsm == NULL) | |
3816 | continue; | |
3817 | if (thr == ecs->event_thread) | |
3818 | continue; | |
3819 | ||
00431a78 | 3820 | switch_to_thread (thr); |
46e3ed7f | 3821 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
3822 | } |
3823 | ||
3824 | if (ecs->event_thread != NULL) | |
00431a78 | 3825 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3826 | } |
3827 | } | |
3828 | ||
3b12939d PA |
3829 | /* Helper for all_uis_check_sync_execution_done that works on the |
3830 | current UI. */ | |
3831 | ||
3832 | static void | |
3833 | check_curr_ui_sync_execution_done (void) | |
3834 | { | |
3835 | struct ui *ui = current_ui; | |
3836 | ||
3837 | if (ui->prompt_state == PROMPT_NEEDED | |
3838 | && ui->async | |
3839 | && !gdb_in_secondary_prompt_p (ui)) | |
3840 | { | |
223ffa71 | 3841 | target_terminal::ours (); |
76727919 | 3842 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3843 | ui_register_input_event_handler (ui); |
3b12939d PA |
3844 | } |
3845 | } | |
3846 | ||
3847 | /* See infrun.h. */ | |
3848 | ||
3849 | void | |
3850 | all_uis_check_sync_execution_done (void) | |
3851 | { | |
0e454242 | 3852 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3853 | { |
3854 | check_curr_ui_sync_execution_done (); | |
3855 | } | |
3856 | } | |
3857 | ||
a8836c93 PA |
3858 | /* See infrun.h. */ |
3859 | ||
3860 | void | |
3861 | all_uis_on_sync_execution_starting (void) | |
3862 | { | |
0e454242 | 3863 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3864 | { |
3865 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3866 | async_disable_stdin (); | |
3867 | } | |
3868 | } | |
3869 | ||
1777feb0 | 3870 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3871 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3872 | descriptor corresponding to the target. It can be called more than |
3873 | once to complete a single execution command. In such cases we need | |
3874 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3875 | that this function is called for a single execution command, then |
3876 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3877 | necessary cleanups. */ |
43ff13b4 JM |
3878 | |
3879 | void | |
fba45db2 | 3880 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3881 | { |
0d1e5fa7 | 3882 | struct execution_control_state ecss; |
a474d7c2 | 3883 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 3884 | int cmd_done = 0; |
43ff13b4 | 3885 | |
0d1e5fa7 PA |
3886 | memset (ecs, 0, sizeof (*ecs)); |
3887 | ||
c61db772 PA |
3888 | /* Events are always processed with the main UI as current UI. This |
3889 | way, warnings, debug output, etc. are always consistently sent to | |
3890 | the main console. */ | |
4b6749b9 | 3891 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3892 | |
d3d4baed | 3893 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
3894 | { |
3895 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
3896 | ||
3897 | /* We're handling a live event, so make sure we're doing live | |
3898 | debugging. If we're looking at traceframes while the target is | |
3899 | running, we're going to need to get back to that mode after | |
3900 | handling the event. */ | |
3901 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
3902 | if (non_stop) | |
3903 | { | |
3904 | maybe_restore_traceframe.emplace (); | |
3905 | set_current_traceframe (-1); | |
3906 | } | |
43ff13b4 | 3907 | |
873657b9 PA |
3908 | /* The user/frontend should not notice a thread switch due to |
3909 | internal events. Make sure we revert to the user selected | |
3910 | thread and frame after handling the event and running any | |
3911 | breakpoint commands. */ | |
3912 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
3913 | |
3914 | overlay_cache_invalid = 1; | |
3915 | /* Flush target cache before starting to handle each event. Target | |
3916 | was running and cache could be stale. This is just a heuristic. | |
3917 | Running threads may modify target memory, but we don't get any | |
3918 | event. */ | |
3919 | target_dcache_invalidate (); | |
3920 | ||
3921 | scoped_restore save_exec_dir | |
3922 | = make_scoped_restore (&execution_direction, | |
3923 | target_execution_direction ()); | |
3924 | ||
5b6d1e4f PA |
3925 | if (!do_target_wait (minus_one_ptid, ecs, TARGET_WNOHANG)) |
3926 | return; | |
3927 | ||
3928 | gdb_assert (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3929 | ||
3930 | /* Switch to the target that generated the event, so we can do | |
3931 | target calls. Any inferior bound to the target will do, so we | |
3932 | just switch to the first we find. */ | |
3933 | for (inferior *inf : all_inferiors (ecs->target)) | |
3934 | { | |
3935 | switch_to_inferior_no_thread (inf); | |
3936 | break; | |
3937 | } | |
d238133d TT |
3938 | |
3939 | if (debug_infrun) | |
5b6d1e4f | 3940 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
d238133d TT |
3941 | |
3942 | /* If an error happens while handling the event, propagate GDB's | |
3943 | knowledge of the executing state to the frontend/user running | |
3944 | state. */ | |
3945 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 3946 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 3947 | |
979a0d13 | 3948 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
3949 | still for the thread which has thrown the exception. */ |
3950 | auto defer_bpstat_clear | |
3951 | = make_scope_exit (bpstat_clear_actions); | |
3952 | auto defer_delete_threads | |
3953 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
3954 | ||
3955 | /* Now figure out what to do with the result of the result. */ | |
3956 | handle_inferior_event (ecs); | |
3957 | ||
3958 | if (!ecs->wait_some_more) | |
3959 | { | |
5b6d1e4f | 3960 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
d238133d TT |
3961 | int should_stop = 1; |
3962 | struct thread_info *thr = ecs->event_thread; | |
d6b48e9c | 3963 | |
d238133d | 3964 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3965 | |
d238133d TT |
3966 | if (thr != NULL) |
3967 | { | |
3968 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 3969 | |
d238133d | 3970 | if (thread_fsm != NULL) |
46e3ed7f | 3971 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 3972 | } |
243a9253 | 3973 | |
d238133d TT |
3974 | if (!should_stop) |
3975 | { | |
3976 | keep_going (ecs); | |
3977 | } | |
3978 | else | |
3979 | { | |
46e3ed7f | 3980 | bool should_notify_stop = true; |
d238133d | 3981 | int proceeded = 0; |
1840d81a | 3982 | |
d238133d | 3983 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 3984 | |
d238133d | 3985 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 3986 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 3987 | |
d238133d TT |
3988 | if (should_notify_stop) |
3989 | { | |
3990 | /* We may not find an inferior if this was a process exit. */ | |
3991 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
3992 | proceeded = normal_stop (); | |
3993 | } | |
243a9253 | 3994 | |
d238133d TT |
3995 | if (!proceeded) |
3996 | { | |
3997 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
3998 | cmd_done = 1; | |
3999 | } | |
873657b9 PA |
4000 | |
4001 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
4002 | previously selected thread is gone. We have two | |
4003 | choices - switch to no thread selected, or restore the | |
4004 | previously selected thread (now exited). We chose the | |
4005 | later, just because that's what GDB used to do. After | |
4006 | this, "info threads" says "The current thread <Thread | |
4007 | ID 2> has terminated." instead of "No thread | |
4008 | selected.". */ | |
4009 | if (!non_stop | |
4010 | && cmd_done | |
4011 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
4012 | restore_thread.dont_restore (); | |
d238133d TT |
4013 | } |
4014 | } | |
4f8d22e3 | 4015 | |
d238133d TT |
4016 | defer_delete_threads.release (); |
4017 | defer_bpstat_clear.release (); | |
29f49a6a | 4018 | |
d238133d TT |
4019 | /* No error, don't finish the thread states yet. */ |
4020 | finish_state.release (); | |
731f534f | 4021 | |
d238133d TT |
4022 | /* This scope is used to ensure that readline callbacks are |
4023 | reinstalled here. */ | |
4024 | } | |
4f8d22e3 | 4025 | |
3b12939d PA |
4026 | /* If a UI was in sync execution mode, and now isn't, restore its |
4027 | prompt (a synchronous execution command has finished, and we're | |
4028 | ready for input). */ | |
4029 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4030 | |
4031 | if (cmd_done | |
0f641c01 | 4032 | && exec_done_display_p |
00431a78 PA |
4033 | && (inferior_ptid == null_ptid |
4034 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 4035 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
4036 | } |
4037 | ||
29734269 SM |
4038 | /* See infrun.h. */ |
4039 | ||
edb3359d | 4040 | void |
29734269 SM |
4041 | set_step_info (thread_info *tp, struct frame_info *frame, |
4042 | struct symtab_and_line sal) | |
edb3359d | 4043 | { |
29734269 SM |
4044 | /* This can be removed once this function no longer implicitly relies on the |
4045 | inferior_ptid value. */ | |
4046 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4047 | |
16c381f0 JK |
4048 | tp->control.step_frame_id = get_frame_id (frame); |
4049 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4050 | |
4051 | tp->current_symtab = sal.symtab; | |
4052 | tp->current_line = sal.line; | |
4053 | } | |
4054 | ||
0d1e5fa7 PA |
4055 | /* Clear context switchable stepping state. */ |
4056 | ||
4057 | void | |
4e1c45ea | 4058 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4059 | { |
7f5ef605 | 4060 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4061 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4062 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4063 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4064 | } |
4065 | ||
ab1ddbcf | 4066 | /* See infrun.h. */ |
c32c64b7 | 4067 | |
6efcd9a8 | 4068 | void |
5b6d1e4f PA |
4069 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
4070 | target_waitstatus status) | |
c32c64b7 | 4071 | { |
5b6d1e4f | 4072 | target_last_proc_target = target; |
c32c64b7 DE |
4073 | target_last_wait_ptid = ptid; |
4074 | target_last_waitstatus = status; | |
4075 | } | |
4076 | ||
ab1ddbcf | 4077 | /* See infrun.h. */ |
e02bc4cc DS |
4078 | |
4079 | void | |
5b6d1e4f PA |
4080 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4081 | target_waitstatus *status) | |
e02bc4cc | 4082 | { |
5b6d1e4f PA |
4083 | if (target != nullptr) |
4084 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4085 | if (ptid != nullptr) |
4086 | *ptid = target_last_wait_ptid; | |
4087 | if (status != nullptr) | |
4088 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4089 | } |
4090 | ||
ab1ddbcf PA |
4091 | /* See infrun.h. */ |
4092 | ||
ac264b3b MS |
4093 | void |
4094 | nullify_last_target_wait_ptid (void) | |
4095 | { | |
5b6d1e4f | 4096 | target_last_proc_target = nullptr; |
ac264b3b | 4097 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4098 | target_last_waitstatus = {}; |
ac264b3b MS |
4099 | } |
4100 | ||
dcf4fbde | 4101 | /* Switch thread contexts. */ |
dd80620e MS |
4102 | |
4103 | static void | |
00431a78 | 4104 | context_switch (execution_control_state *ecs) |
dd80620e | 4105 | { |
4100594e | 4106 | if (ecs->ptid != inferior_ptid |
5b6d1e4f PA |
4107 | && (inferior_ptid == null_ptid |
4108 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 | 4109 | { |
4100594e SM |
4110 | infrun_log_debug ("Switching context from %s to %s", |
4111 | target_pid_to_str (inferior_ptid).c_str (), | |
4112 | target_pid_to_str (ecs->ptid).c_str ()); | |
fd48f117 DJ |
4113 | } |
4114 | ||
00431a78 | 4115 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4116 | } |
4117 | ||
d8dd4d5f PA |
4118 | /* If the target can't tell whether we've hit breakpoints |
4119 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4120 | check whether that could have been caused by a breakpoint. If so, | |
4121 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4122 | ||
4fa8626c | 4123 | static void |
d8dd4d5f PA |
4124 | adjust_pc_after_break (struct thread_info *thread, |
4125 | struct target_waitstatus *ws) | |
4fa8626c | 4126 | { |
24a73cce UW |
4127 | struct regcache *regcache; |
4128 | struct gdbarch *gdbarch; | |
118e6252 | 4129 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4130 | |
4fa8626c DJ |
4131 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4132 | we aren't, just return. | |
9709f61c DJ |
4133 | |
4134 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4135 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4136 | implemented by software breakpoints should be handled through the normal | |
4137 | breakpoint layer. | |
8fb3e588 | 4138 | |
4fa8626c DJ |
4139 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4140 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4141 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4142 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4143 | generates these signals at breakpoints (the code has been in GDB since at | |
4144 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4145 | |
e6cf7916 UW |
4146 | In earlier versions of GDB, a target with |
4147 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4148 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4149 | target with both of these set in GDB history, and it seems unlikely to be | |
4150 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4151 | |
d8dd4d5f | 4152 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4153 | return; |
4154 | ||
d8dd4d5f | 4155 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4156 | return; |
4157 | ||
4058b839 PA |
4158 | /* In reverse execution, when a breakpoint is hit, the instruction |
4159 | under it has already been de-executed. The reported PC always | |
4160 | points at the breakpoint address, so adjusting it further would | |
4161 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4162 | architecture: | |
4163 | ||
4164 | B1 0x08000000 : INSN1 | |
4165 | B2 0x08000001 : INSN2 | |
4166 | 0x08000002 : INSN3 | |
4167 | PC -> 0x08000003 : INSN4 | |
4168 | ||
4169 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4170 | from that point should hit B2 as below. Reading the PC when the | |
4171 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4172 | been de-executed already. | |
4173 | ||
4174 | B1 0x08000000 : INSN1 | |
4175 | B2 PC -> 0x08000001 : INSN2 | |
4176 | 0x08000002 : INSN3 | |
4177 | 0x08000003 : INSN4 | |
4178 | ||
4179 | We can't apply the same logic as for forward execution, because | |
4180 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4181 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4182 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4183 | behaviour. */ | |
4184 | if (execution_direction == EXEC_REVERSE) | |
4185 | return; | |
4186 | ||
1cf4d951 PA |
4187 | /* If the target can tell whether the thread hit a SW breakpoint, |
4188 | trust it. Targets that can tell also adjust the PC | |
4189 | themselves. */ | |
4190 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4191 | return; | |
4192 | ||
4193 | /* Note that relying on whether a breakpoint is planted in memory to | |
4194 | determine this can fail. E.g,. the breakpoint could have been | |
4195 | removed since. Or the thread could have been told to step an | |
4196 | instruction the size of a breakpoint instruction, and only | |
4197 | _after_ was a breakpoint inserted at its address. */ | |
4198 | ||
24a73cce UW |
4199 | /* If this target does not decrement the PC after breakpoints, then |
4200 | we have nothing to do. */ | |
00431a78 | 4201 | regcache = get_thread_regcache (thread); |
ac7936df | 4202 | gdbarch = regcache->arch (); |
118e6252 | 4203 | |
527a273a | 4204 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4205 | if (decr_pc == 0) |
24a73cce UW |
4206 | return; |
4207 | ||
8b86c959 | 4208 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4209 | |
8aad930b AC |
4210 | /* Find the location where (if we've hit a breakpoint) the |
4211 | breakpoint would be. */ | |
118e6252 | 4212 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4213 | |
1cf4d951 PA |
4214 | /* If the target can't tell whether a software breakpoint triggered, |
4215 | fallback to figuring it out based on breakpoints we think were | |
4216 | inserted in the target, and on whether the thread was stepped or | |
4217 | continued. */ | |
4218 | ||
1c5cfe86 PA |
4219 | /* Check whether there actually is a software breakpoint inserted at |
4220 | that location. | |
4221 | ||
4222 | If in non-stop mode, a race condition is possible where we've | |
4223 | removed a breakpoint, but stop events for that breakpoint were | |
4224 | already queued and arrive later. To suppress those spurious | |
4225 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4226 | and retire them after a number of stop events are reported. Note |
4227 | this is an heuristic and can thus get confused. The real fix is | |
4228 | to get the "stopped by SW BP and needs adjustment" info out of | |
4229 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4230 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4231 | || (target_is_non_stop_p () |
4232 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4233 | { |
07036511 | 4234 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4235 | |
8213266a | 4236 | if (record_full_is_used ()) |
07036511 TT |
4237 | restore_operation_disable.emplace |
4238 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4239 | |
1c0fdd0e UW |
4240 | /* When using hardware single-step, a SIGTRAP is reported for both |
4241 | a completed single-step and a software breakpoint. Need to | |
4242 | differentiate between the two, as the latter needs adjusting | |
4243 | but the former does not. | |
4244 | ||
4245 | The SIGTRAP can be due to a completed hardware single-step only if | |
4246 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4247 | - this thread is currently being stepped |
4248 | ||
4249 | If any of these events did not occur, we must have stopped due | |
4250 | to hitting a software breakpoint, and have to back up to the | |
4251 | breakpoint address. | |
4252 | ||
4253 | As a special case, we could have hardware single-stepped a | |
4254 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4255 | we also need to back up to the breakpoint address. */ | |
4256 | ||
d8dd4d5f PA |
4257 | if (thread_has_single_step_breakpoints_set (thread) |
4258 | || !currently_stepping (thread) | |
4259 | || (thread->stepped_breakpoint | |
4260 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4261 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4262 | } |
4fa8626c DJ |
4263 | } |
4264 | ||
edb3359d DJ |
4265 | static int |
4266 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4267 | { | |
4268 | for (frame = get_prev_frame (frame); | |
4269 | frame != NULL; | |
4270 | frame = get_prev_frame (frame)) | |
4271 | { | |
4272 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4273 | return 1; | |
4274 | if (get_frame_type (frame) != INLINE_FRAME) | |
4275 | break; | |
4276 | } | |
4277 | ||
4278 | return 0; | |
4279 | } | |
4280 | ||
4a4c04f1 BE |
4281 | /* Look for an inline frame that is marked for skip. |
4282 | If PREV_FRAME is TRUE start at the previous frame, | |
4283 | otherwise start at the current frame. Stop at the | |
4284 | first non-inline frame, or at the frame where the | |
4285 | step started. */ | |
4286 | ||
4287 | static bool | |
4288 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4289 | { | |
4290 | struct frame_info *frame = get_current_frame (); | |
4291 | ||
4292 | if (prev_frame) | |
4293 | frame = get_prev_frame (frame); | |
4294 | ||
4295 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4296 | { | |
4297 | const char *fn = NULL; | |
4298 | symtab_and_line sal; | |
4299 | struct symbol *sym; | |
4300 | ||
4301 | if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id)) | |
4302 | break; | |
4303 | if (get_frame_type (frame) != INLINE_FRAME) | |
4304 | break; | |
4305 | ||
4306 | sal = find_frame_sal (frame); | |
4307 | sym = get_frame_function (frame); | |
4308 | ||
4309 | if (sym != NULL) | |
4310 | fn = sym->print_name (); | |
4311 | ||
4312 | if (sal.line != 0 | |
4313 | && function_name_is_marked_for_skip (fn, sal)) | |
4314 | return true; | |
4315 | } | |
4316 | ||
4317 | return false; | |
4318 | } | |
4319 | ||
c65d6b55 PA |
4320 | /* If the event thread has the stop requested flag set, pretend it |
4321 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4322 | target_stop). */ | |
4323 | ||
4324 | static bool | |
4325 | handle_stop_requested (struct execution_control_state *ecs) | |
4326 | { | |
4327 | if (ecs->event_thread->stop_requested) | |
4328 | { | |
4329 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4330 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4331 | handle_signal_stop (ecs); | |
4332 | return true; | |
4333 | } | |
4334 | return false; | |
4335 | } | |
4336 | ||
a96d9b2e SDJ |
4337 | /* Auxiliary function that handles syscall entry/return events. |
4338 | It returns 1 if the inferior should keep going (and GDB | |
4339 | should ignore the event), or 0 if the event deserves to be | |
4340 | processed. */ | |
ca2163eb | 4341 | |
a96d9b2e | 4342 | static int |
ca2163eb | 4343 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4344 | { |
ca2163eb | 4345 | struct regcache *regcache; |
ca2163eb PA |
4346 | int syscall_number; |
4347 | ||
00431a78 | 4348 | context_switch (ecs); |
ca2163eb | 4349 | |
00431a78 | 4350 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4351 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4352 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4353 | |
a96d9b2e SDJ |
4354 | if (catch_syscall_enabled () > 0 |
4355 | && catching_syscall_number (syscall_number) > 0) | |
4356 | { | |
4100594e | 4357 | infrun_log_debug ("syscall number=%d", syscall_number); |
a96d9b2e | 4358 | |
16c381f0 | 4359 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4360 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4361 | ecs->event_thread->suspend.stop_pc, |
4362 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4363 | |
c65d6b55 PA |
4364 | if (handle_stop_requested (ecs)) |
4365 | return 0; | |
4366 | ||
ce12b012 | 4367 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4368 | { |
4369 | /* Catchpoint hit. */ | |
ca2163eb PA |
4370 | return 0; |
4371 | } | |
a96d9b2e | 4372 | } |
ca2163eb | 4373 | |
c65d6b55 PA |
4374 | if (handle_stop_requested (ecs)) |
4375 | return 0; | |
4376 | ||
ca2163eb | 4377 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb PA |
4378 | keep_going (ecs); |
4379 | return 1; | |
a96d9b2e SDJ |
4380 | } |
4381 | ||
7e324e48 GB |
4382 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4383 | ||
4384 | static void | |
4385 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4386 | struct execution_control_state *ecs) | |
4387 | { | |
4388 | if (!ecs->stop_func_filled_in) | |
4389 | { | |
98a617f8 KB |
4390 | const block *block; |
4391 | ||
7e324e48 GB |
4392 | /* Don't care about return value; stop_func_start and stop_func_name |
4393 | will both be 0 if it doesn't work. */ | |
98a617f8 KB |
4394 | find_pc_partial_function (ecs->event_thread->suspend.stop_pc, |
4395 | &ecs->stop_func_name, | |
4396 | &ecs->stop_func_start, | |
4397 | &ecs->stop_func_end, | |
4398 | &block); | |
4399 | ||
4400 | /* The call to find_pc_partial_function, above, will set | |
4401 | stop_func_start and stop_func_end to the start and end | |
4402 | of the range containing the stop pc. If this range | |
4403 | contains the entry pc for the block (which is always the | |
4404 | case for contiguous blocks), advance stop_func_start past | |
4405 | the function's start offset and entrypoint. Note that | |
4406 | stop_func_start is NOT advanced when in a range of a | |
4407 | non-contiguous block that does not contain the entry pc. */ | |
4408 | if (block != nullptr | |
4409 | && ecs->stop_func_start <= BLOCK_ENTRY_PC (block) | |
4410 | && BLOCK_ENTRY_PC (block) < ecs->stop_func_end) | |
4411 | { | |
4412 | ecs->stop_func_start | |
4413 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4414 | ||
4415 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4416 | ecs->stop_func_start | |
4417 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4418 | } | |
591a12a1 | 4419 | |
7e324e48 GB |
4420 | ecs->stop_func_filled_in = 1; |
4421 | } | |
4422 | } | |
4423 | ||
4f5d7f63 | 4424 | |
00431a78 | 4425 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4426 | |
4427 | static enum stop_kind | |
00431a78 | 4428 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4429 | { |
5b6d1e4f | 4430 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4431 | |
4432 | gdb_assert (inf != NULL); | |
4433 | return inf->control.stop_soon; | |
4434 | } | |
4435 | ||
5b6d1e4f PA |
4436 | /* Poll for one event out of the current target. Store the resulting |
4437 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4438 | |
4439 | static ptid_t | |
5b6d1e4f | 4440 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4441 | { |
4442 | ptid_t event_ptid; | |
372316f1 PA |
4443 | |
4444 | overlay_cache_invalid = 1; | |
4445 | ||
4446 | /* Flush target cache before starting to handle each event. | |
4447 | Target was running and cache could be stale. This is just a | |
4448 | heuristic. Running threads may modify target memory, but we | |
4449 | don't get any event. */ | |
4450 | target_dcache_invalidate (); | |
4451 | ||
4452 | if (deprecated_target_wait_hook) | |
5b6d1e4f | 4453 | event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 | 4454 | else |
5b6d1e4f | 4455 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4456 | |
4457 | if (debug_infrun) | |
5b6d1e4f | 4458 | print_target_wait_results (minus_one_ptid, event_ptid, ws); |
372316f1 PA |
4459 | |
4460 | return event_ptid; | |
4461 | } | |
4462 | ||
5b6d1e4f PA |
4463 | /* An event reported by wait_one. */ |
4464 | ||
4465 | struct wait_one_event | |
4466 | { | |
4467 | /* The target the event came out of. */ | |
4468 | process_stratum_target *target; | |
4469 | ||
4470 | /* The PTID the event was for. */ | |
4471 | ptid_t ptid; | |
4472 | ||
4473 | /* The waitstatus. */ | |
4474 | target_waitstatus ws; | |
4475 | }; | |
4476 | ||
4477 | /* Wait for one event out of any target. */ | |
4478 | ||
4479 | static wait_one_event | |
4480 | wait_one () | |
4481 | { | |
4482 | while (1) | |
4483 | { | |
4484 | for (inferior *inf : all_inferiors ()) | |
4485 | { | |
4486 | process_stratum_target *target = inf->process_target (); | |
4487 | if (target == NULL | |
4488 | || !target->is_async_p () | |
4489 | || !target->threads_executing) | |
4490 | continue; | |
4491 | ||
4492 | switch_to_inferior_no_thread (inf); | |
4493 | ||
4494 | wait_one_event event; | |
4495 | event.target = target; | |
4496 | event.ptid = poll_one_curr_target (&event.ws); | |
4497 | ||
4498 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4499 | { | |
4500 | /* If nothing is resumed, remove the target from the | |
4501 | event loop. */ | |
4502 | target_async (0); | |
4503 | } | |
4504 | else if (event.ws.kind != TARGET_WAITKIND_IGNORE) | |
4505 | return event; | |
4506 | } | |
4507 | ||
4508 | /* Block waiting for some event. */ | |
4509 | ||
4510 | fd_set readfds; | |
4511 | int nfds = 0; | |
4512 | ||
4513 | FD_ZERO (&readfds); | |
4514 | ||
4515 | for (inferior *inf : all_inferiors ()) | |
4516 | { | |
4517 | process_stratum_target *target = inf->process_target (); | |
4518 | if (target == NULL | |
4519 | || !target->is_async_p () | |
4520 | || !target->threads_executing) | |
4521 | continue; | |
4522 | ||
4523 | int fd = target->async_wait_fd (); | |
4524 | FD_SET (fd, &readfds); | |
4525 | if (nfds <= fd) | |
4526 | nfds = fd + 1; | |
4527 | } | |
4528 | ||
4529 | if (nfds == 0) | |
4530 | { | |
4531 | /* No waitable targets left. All must be stopped. */ | |
4532 | return {NULL, minus_one_ptid, {TARGET_WAITKIND_NO_RESUMED}}; | |
4533 | } | |
4534 | ||
4535 | QUIT; | |
4536 | ||
4537 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4538 | if (numfds < 0) | |
4539 | { | |
4540 | if (errno == EINTR) | |
4541 | continue; | |
4542 | else | |
4543 | perror_with_name ("interruptible_select"); | |
4544 | } | |
4545 | } | |
4546 | } | |
4547 | ||
372316f1 PA |
4548 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID |
4549 | instead of the current thread. */ | |
4550 | #define THREAD_STOPPED_BY(REASON) \ | |
4551 | static int \ | |
4552 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4553 | { \ | |
2989a365 | 4554 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); \ |
372316f1 PA |
4555 | inferior_ptid = ptid; \ |
4556 | \ | |
2989a365 | 4557 | return target_stopped_by_ ## REASON (); \ |
372316f1 PA |
4558 | } |
4559 | ||
4560 | /* Generate thread_stopped_by_watchpoint. */ | |
4561 | THREAD_STOPPED_BY (watchpoint) | |
4562 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4563 | THREAD_STOPPED_BY (sw_breakpoint) | |
4564 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4565 | THREAD_STOPPED_BY (hw_breakpoint) | |
4566 | ||
372316f1 PA |
4567 | /* Save the thread's event and stop reason to process it later. */ |
4568 | ||
4569 | static void | |
5b6d1e4f | 4570 | save_waitstatus (struct thread_info *tp, const target_waitstatus *ws) |
372316f1 | 4571 | { |
4100594e SM |
4572 | infrun_log_debug ("saving status %s for %d.%ld.%ld", |
4573 | target_waitstatus_to_string (ws).c_str (), | |
4574 | tp->ptid.pid (), | |
4575 | tp->ptid.lwp (), | |
4576 | tp->ptid.tid ()); | |
372316f1 PA |
4577 | |
4578 | /* Record for later. */ | |
4579 | tp->suspend.waitstatus = *ws; | |
4580 | tp->suspend.waitstatus_pending_p = 1; | |
4581 | ||
00431a78 | 4582 | struct regcache *regcache = get_thread_regcache (tp); |
8b86c959 | 4583 | const address_space *aspace = regcache->aspace (); |
372316f1 PA |
4584 | |
4585 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4586 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4587 | { | |
4588 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4589 | ||
4590 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4591 | ||
4592 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4593 | { | |
4594 | tp->suspend.stop_reason | |
4595 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4596 | } | |
4597 | else if (target_supports_stopped_by_sw_breakpoint () | |
4598 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4599 | { | |
4600 | tp->suspend.stop_reason | |
4601 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4602 | } | |
4603 | else if (target_supports_stopped_by_hw_breakpoint () | |
4604 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4605 | { | |
4606 | tp->suspend.stop_reason | |
4607 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4608 | } | |
4609 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4610 | && hardware_breakpoint_inserted_here_p (aspace, | |
4611 | pc)) | |
4612 | { | |
4613 | tp->suspend.stop_reason | |
4614 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4615 | } | |
4616 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4617 | && software_breakpoint_inserted_here_p (aspace, | |
4618 | pc)) | |
4619 | { | |
4620 | tp->suspend.stop_reason | |
4621 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4622 | } | |
4623 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4624 | && currently_stepping (tp)) | |
4625 | { | |
4626 | tp->suspend.stop_reason | |
4627 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4628 | } | |
4629 | } | |
4630 | } | |
4631 | ||
293b3ebc TBA |
4632 | /* Mark the non-executing threads accordingly. In all-stop, all |
4633 | threads of all processes are stopped when we get any event | |
4634 | reported. In non-stop mode, only the event thread stops. */ | |
4635 | ||
4636 | static void | |
4637 | mark_non_executing_threads (process_stratum_target *target, | |
4638 | ptid_t event_ptid, | |
4639 | struct target_waitstatus ws) | |
4640 | { | |
4641 | ptid_t mark_ptid; | |
4642 | ||
4643 | if (!target_is_non_stop_p ()) | |
4644 | mark_ptid = minus_one_ptid; | |
4645 | else if (ws.kind == TARGET_WAITKIND_SIGNALLED | |
4646 | || ws.kind == TARGET_WAITKIND_EXITED) | |
4647 | { | |
4648 | /* If we're handling a process exit in non-stop mode, even | |
4649 | though threads haven't been deleted yet, one would think | |
4650 | that there is nothing to do, as threads of the dead process | |
4651 | will be soon deleted, and threads of any other process were | |
4652 | left running. However, on some targets, threads survive a | |
4653 | process exit event. E.g., for the "checkpoint" command, | |
4654 | when the current checkpoint/fork exits, linux-fork.c | |
4655 | automatically switches to another fork from within | |
4656 | target_mourn_inferior, by associating the same | |
4657 | inferior/thread to another fork. We haven't mourned yet at | |
4658 | this point, but we must mark any threads left in the | |
4659 | process as not-executing so that finish_thread_state marks | |
4660 | them stopped (in the user's perspective) if/when we present | |
4661 | the stop to the user. */ | |
4662 | mark_ptid = ptid_t (event_ptid.pid ()); | |
4663 | } | |
4664 | else | |
4665 | mark_ptid = event_ptid; | |
4666 | ||
4667 | set_executing (target, mark_ptid, false); | |
4668 | ||
4669 | /* Likewise the resumed flag. */ | |
4670 | set_resumed (target, mark_ptid, false); | |
4671 | } | |
4672 | ||
6efcd9a8 | 4673 | /* See infrun.h. */ |
372316f1 | 4674 | |
6efcd9a8 | 4675 | void |
372316f1 PA |
4676 | stop_all_threads (void) |
4677 | { | |
4678 | /* We may need multiple passes to discover all threads. */ | |
4679 | int pass; | |
4680 | int iterations = 0; | |
372316f1 | 4681 | |
53cccef1 | 4682 | gdb_assert (exists_non_stop_target ()); |
372316f1 | 4683 | |
4100594e | 4684 | infrun_log_debug ("stop_all_threads"); |
372316f1 | 4685 | |
00431a78 | 4686 | scoped_restore_current_thread restore_thread; |
372316f1 | 4687 | |
6ad82919 TBA |
4688 | /* Enable thread events of all targets. */ |
4689 | for (auto *target : all_non_exited_process_targets ()) | |
4690 | { | |
4691 | switch_to_target_no_thread (target); | |
4692 | target_thread_events (true); | |
4693 | } | |
4694 | ||
4695 | SCOPE_EXIT | |
4696 | { | |
4697 | /* Disable thread events of all targets. */ | |
4698 | for (auto *target : all_non_exited_process_targets ()) | |
4699 | { | |
4700 | switch_to_target_no_thread (target); | |
4701 | target_thread_events (false); | |
4702 | } | |
4703 | ||
4100594e SM |
4704 | |
4705 | infrun_log_debug ("stop_all_threads done"); | |
6ad82919 | 4706 | }; |
65706a29 | 4707 | |
372316f1 PA |
4708 | /* Request threads to stop, and then wait for the stops. Because |
4709 | threads we already know about can spawn more threads while we're | |
4710 | trying to stop them, and we only learn about new threads when we | |
4711 | update the thread list, do this in a loop, and keep iterating | |
4712 | until two passes find no threads that need to be stopped. */ | |
4713 | for (pass = 0; pass < 2; pass++, iterations++) | |
4714 | { | |
4100594e SM |
4715 | infrun_log_debug ("stop_all_threads, pass=%d, iterations=%d", |
4716 | pass, iterations); | |
372316f1 PA |
4717 | while (1) |
4718 | { | |
29d6859f | 4719 | int waits_needed = 0; |
372316f1 | 4720 | |
a05575d3 TBA |
4721 | for (auto *target : all_non_exited_process_targets ()) |
4722 | { | |
4723 | switch_to_target_no_thread (target); | |
4724 | update_thread_list (); | |
4725 | } | |
372316f1 PA |
4726 | |
4727 | /* Go through all threads looking for threads that we need | |
4728 | to tell the target to stop. */ | |
08036331 | 4729 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 4730 | { |
53cccef1 TBA |
4731 | /* For a single-target setting with an all-stop target, |
4732 | we would not even arrive here. For a multi-target | |
4733 | setting, until GDB is able to handle a mixture of | |
4734 | all-stop and non-stop targets, simply skip all-stop | |
4735 | targets' threads. This should be fine due to the | |
4736 | protection of 'check_multi_target_resumption'. */ | |
4737 | ||
4738 | switch_to_thread_no_regs (t); | |
4739 | if (!target_is_non_stop_p ()) | |
4740 | continue; | |
4741 | ||
372316f1 PA |
4742 | if (t->executing) |
4743 | { | |
4744 | /* If already stopping, don't request a stop again. | |
4745 | We just haven't seen the notification yet. */ | |
4746 | if (!t->stop_requested) | |
4747 | { | |
4100594e SM |
4748 | infrun_log_debug (" %s executing, need stop", |
4749 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4750 | target_stop (t->ptid); |
4751 | t->stop_requested = 1; | |
4752 | } | |
4753 | else | |
4754 | { | |
4100594e SM |
4755 | infrun_log_debug (" %s executing, already stopping", |
4756 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4757 | } |
4758 | ||
4759 | if (t->stop_requested) | |
29d6859f | 4760 | waits_needed++; |
372316f1 PA |
4761 | } |
4762 | else | |
4763 | { | |
4100594e SM |
4764 | infrun_log_debug (" %s not executing", |
4765 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4766 | |
4767 | /* The thread may be not executing, but still be | |
4768 | resumed with a pending status to process. */ | |
719546c4 | 4769 | t->resumed = false; |
372316f1 PA |
4770 | } |
4771 | } | |
4772 | ||
29d6859f | 4773 | if (waits_needed == 0) |
372316f1 PA |
4774 | break; |
4775 | ||
4776 | /* If we find new threads on the second iteration, restart | |
4777 | over. We want to see two iterations in a row with all | |
4778 | threads stopped. */ | |
4779 | if (pass > 0) | |
4780 | pass = -1; | |
4781 | ||
29d6859f | 4782 | for (int i = 0; i < waits_needed; i++) |
c29705b7 | 4783 | { |
29d6859f | 4784 | wait_one_event event = wait_one (); |
a05575d3 | 4785 | |
4100594e SM |
4786 | infrun_log_debug ("%s %s\n", |
4787 | target_waitstatus_to_string (&event.ws).c_str (), | |
4788 | target_pid_to_str (event.ptid).c_str ()); | |
a05575d3 | 4789 | |
29d6859f | 4790 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) |
a05575d3 | 4791 | { |
29d6859f LM |
4792 | /* All resumed threads exited. */ |
4793 | break; | |
a05575d3 | 4794 | } |
29d6859f LM |
4795 | else if (event.ws.kind == TARGET_WAITKIND_THREAD_EXITED |
4796 | || event.ws.kind == TARGET_WAITKIND_EXITED | |
4797 | || event.ws.kind == TARGET_WAITKIND_SIGNALLED) | |
6efcd9a8 | 4798 | { |
29d6859f | 4799 | /* One thread/process exited/signalled. */ |
6efcd9a8 | 4800 | |
29d6859f | 4801 | thread_info *t = nullptr; |
372316f1 | 4802 | |
29d6859f LM |
4803 | /* The target may have reported just a pid. If so, try |
4804 | the first non-exited thread. */ | |
4805 | if (event.ptid.is_pid ()) | |
372316f1 | 4806 | { |
29d6859f LM |
4807 | int pid = event.ptid.pid (); |
4808 | inferior *inf = find_inferior_pid (event.target, pid); | |
4809 | for (thread_info *tp : inf->non_exited_threads ()) | |
372316f1 | 4810 | { |
29d6859f LM |
4811 | t = tp; |
4812 | break; | |
372316f1 | 4813 | } |
29d6859f LM |
4814 | |
4815 | /* If there is no available thread, the event would | |
4816 | have to be appended to a per-inferior event list, | |
4817 | which does not exist (and if it did, we'd have | |
4818 | to adjust run control command to be able to | |
4819 | resume such an inferior). We assert here instead | |
4820 | of going into an infinite loop. */ | |
4821 | gdb_assert (t != nullptr); | |
4822 | ||
4100594e SM |
4823 | infrun_log_debug ("using %s\n", |
4824 | target_pid_to_str (t->ptid).c_str ()); | |
29d6859f LM |
4825 | } |
4826 | else | |
4827 | { | |
4828 | t = find_thread_ptid (event.target, event.ptid); | |
4829 | /* Check if this is the first time we see this thread. | |
4830 | Don't bother adding if it individually exited. */ | |
4831 | if (t == nullptr | |
4832 | && event.ws.kind != TARGET_WAITKIND_THREAD_EXITED) | |
4833 | t = add_thread (event.target, event.ptid); | |
4834 | } | |
4835 | ||
4836 | if (t != nullptr) | |
4837 | { | |
4838 | /* Set the threads as non-executing to avoid | |
4839 | another stop attempt on them. */ | |
4840 | switch_to_thread_no_regs (t); | |
4841 | mark_non_executing_threads (event.target, event.ptid, | |
4842 | event.ws); | |
4843 | save_waitstatus (t, &event.ws); | |
4844 | t->stop_requested = false; | |
372316f1 PA |
4845 | } |
4846 | } | |
4847 | else | |
4848 | { | |
29d6859f LM |
4849 | thread_info *t = find_thread_ptid (event.target, event.ptid); |
4850 | if (t == NULL) | |
4851 | t = add_thread (event.target, event.ptid); | |
372316f1 | 4852 | |
29d6859f LM |
4853 | t->stop_requested = 0; |
4854 | t->executing = 0; | |
4855 | t->resumed = false; | |
4856 | t->control.may_range_step = 0; | |
4857 | ||
4858 | /* This may be the first time we see the inferior report | |
4859 | a stop. */ | |
4860 | inferior *inf = find_inferior_ptid (event.target, event.ptid); | |
4861 | if (inf->needs_setup) | |
372316f1 | 4862 | { |
29d6859f LM |
4863 | switch_to_thread_no_regs (t); |
4864 | setup_inferior (0); | |
372316f1 PA |
4865 | } |
4866 | ||
29d6859f LM |
4867 | if (event.ws.kind == TARGET_WAITKIND_STOPPED |
4868 | && event.ws.value.sig == GDB_SIGNAL_0) | |
372316f1 | 4869 | { |
29d6859f LM |
4870 | /* We caught the event that we intended to catch, so |
4871 | there's no event pending. */ | |
4872 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4873 | t->suspend.waitstatus_pending_p = 0; | |
4874 | ||
e088209c | 4875 | if (displaced_step_finish (t, GDB_SIGNAL_0) < 0) |
29d6859f LM |
4876 | { |
4877 | /* Add it back to the step-over queue. */ | |
4100594e SM |
4878 | infrun_log_debug ("displaced-step of %s " |
4879 | "canceled: adding back to the " | |
4880 | "step-over queue\n", | |
4881 | target_pid_to_str (t->ptid).c_str ()); | |
4882 | ||
29d6859f | 4883 | t->control.trap_expected = 0; |
bb88694d | 4884 | global_thread_step_over_chain_enqueue (t); |
29d6859f | 4885 | } |
372316f1 | 4886 | } |
29d6859f LM |
4887 | else |
4888 | { | |
4889 | enum gdb_signal sig; | |
4890 | struct regcache *regcache; | |
372316f1 | 4891 | |
29d6859f LM |
4892 | if (debug_infrun) |
4893 | { | |
4894 | std::string statstr = target_waitstatus_to_string (&event.ws); | |
372316f1 | 4895 | |
4100594e SM |
4896 | infrun_log_debug ("target_wait %s, saving " |
4897 | "status for %d.%ld.%ld\n", | |
4898 | statstr.c_str (), | |
4899 | t->ptid.pid (), | |
4900 | t->ptid.lwp (), | |
4901 | t->ptid.tid ()); | |
29d6859f LM |
4902 | } |
4903 | ||
4904 | /* Record for later. */ | |
4905 | save_waitstatus (t, &event.ws); | |
4906 | ||
4907 | sig = (event.ws.kind == TARGET_WAITKIND_STOPPED | |
4908 | ? event.ws.value.sig : GDB_SIGNAL_0); | |
4909 | ||
e088209c | 4910 | if (displaced_step_finish (t, sig) < 0) |
29d6859f LM |
4911 | { |
4912 | /* Add it back to the step-over queue. */ | |
4913 | t->control.trap_expected = 0; | |
bb88694d | 4914 | global_thread_step_over_chain_enqueue (t); |
29d6859f LM |
4915 | } |
4916 | ||
4917 | regcache = get_thread_regcache (t); | |
4918 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4919 | ||
4100594e SM |
4920 | infrun_log_debug ("saved stop_pc=%s for %s " |
4921 | "(currently_stepping=%d)\n", | |
4922 | paddress (target_gdbarch (), | |
4923 | t->suspend.stop_pc), | |
4924 | target_pid_to_str (t->ptid).c_str (), | |
4925 | currently_stepping (t)); | |
372316f1 PA |
4926 | } |
4927 | } | |
4928 | } | |
4929 | } | |
4930 | } | |
372316f1 PA |
4931 | } |
4932 | ||
f4836ba9 PA |
4933 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4934 | ||
4935 | static int | |
4936 | handle_no_resumed (struct execution_control_state *ecs) | |
4937 | { | |
3b12939d | 4938 | if (target_can_async_p ()) |
f4836ba9 | 4939 | { |
3b12939d | 4940 | int any_sync = 0; |
f4836ba9 | 4941 | |
2dab0c7b | 4942 | for (ui *ui : all_uis ()) |
3b12939d PA |
4943 | { |
4944 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4945 | { | |
4946 | any_sync = 1; | |
4947 | break; | |
4948 | } | |
4949 | } | |
4950 | if (!any_sync) | |
4951 | { | |
4952 | /* There were no unwaited-for children left in the target, but, | |
4953 | we're not synchronously waiting for events either. Just | |
4954 | ignore. */ | |
4955 | ||
4100594e | 4956 | infrun_log_debug ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)"); |
3b12939d PA |
4957 | prepare_to_wait (ecs); |
4958 | return 1; | |
4959 | } | |
f4836ba9 PA |
4960 | } |
4961 | ||
4962 | /* Otherwise, if we were running a synchronous execution command, we | |
4963 | may need to cancel it and give the user back the terminal. | |
4964 | ||
4965 | In non-stop mode, the target can't tell whether we've already | |
4966 | consumed previous stop events, so it can end up sending us a | |
4967 | no-resumed event like so: | |
4968 | ||
4969 | #0 - thread 1 is left stopped | |
4970 | ||
4971 | #1 - thread 2 is resumed and hits breakpoint | |
4972 | -> TARGET_WAITKIND_STOPPED | |
4973 | ||
4974 | #2 - thread 3 is resumed and exits | |
4975 | this is the last resumed thread, so | |
4976 | -> TARGET_WAITKIND_NO_RESUMED | |
4977 | ||
4978 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4979 | it. | |
4980 | ||
4981 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4982 | thread 2 is now resumed, so the event should be ignored. | |
4983 | ||
4984 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4985 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4986 | event. But it could be that the event meant that thread 2 itself | |
4987 | (or whatever other thread was the last resumed thread) exited. | |
4988 | ||
4989 | To address this we refresh the thread list and check whether we | |
4990 | have resumed threads _now_. In the example above, this removes | |
4991 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4992 | ignore this event. If we find no thread resumed, then we cancel | |
4993 | the synchronous command show "no unwaited-for " to the user. */ | |
4994 | update_thread_list (); | |
4995 | ||
5b6d1e4f | 4996 | for (thread_info *thread : all_non_exited_threads (ecs->target)) |
f4836ba9 PA |
4997 | { |
4998 | if (thread->executing | |
4999 | || thread->suspend.waitstatus_pending_p) | |
5000 | { | |
5001 | /* There were no unwaited-for children left in the target at | |
5002 | some point, but there are now. Just ignore. */ | |
4100594e SM |
5003 | infrun_log_debug ("TARGET_WAITKIND_NO_RESUMED " |
5004 | "(ignoring: found resumed)"); | |
f4836ba9 PA |
5005 | prepare_to_wait (ecs); |
5006 | return 1; | |
f4836ba9 PA |
5007 | } |
5008 | } | |
5009 | ||
5010 | /* Go ahead and report the event. */ | |
5011 | return 0; | |
5012 | } | |
5013 | ||
05ba8510 PA |
5014 | /* Given an execution control state that has been freshly filled in by |
5015 | an event from the inferior, figure out what it means and take | |
5016 | appropriate action. | |
5017 | ||
5018 | The alternatives are: | |
5019 | ||
22bcd14b | 5020 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5021 | debugger. |
5022 | ||
5023 | 2) keep_going and return; to wait for the next event (set | |
5024 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5025 | once). */ | |
c906108c | 5026 | |
ec9499be | 5027 | static void |
595915c1 | 5028 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5029 | { |
595915c1 TT |
5030 | /* Make sure that all temporary struct value objects that were |
5031 | created during the handling of the event get deleted at the | |
5032 | end. */ | |
5033 | scoped_value_mark free_values; | |
5034 | ||
d6b48e9c PA |
5035 | enum stop_kind stop_soon; |
5036 | ||
4100594e | 5037 | infrun_log_debug ("%s", target_waitstatus_to_string (&ecs->ws).c_str ()); |
c29705b7 | 5038 | |
28736962 PA |
5039 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
5040 | { | |
5041 | /* We had an event in the inferior, but we are not interested in | |
5042 | handling it at this level. The lower layers have already | |
5043 | done what needs to be done, if anything. | |
5044 | ||
5045 | One of the possible circumstances for this is when the | |
5046 | inferior produces output for the console. The inferior has | |
5047 | not stopped, and we are ignoring the event. Another possible | |
5048 | circumstance is any event which the lower level knows will be | |
5049 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5050 | prepare_to_wait (ecs); |
5051 | return; | |
5052 | } | |
5053 | ||
65706a29 PA |
5054 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
5055 | { | |
65706a29 PA |
5056 | prepare_to_wait (ecs); |
5057 | return; | |
5058 | } | |
5059 | ||
0e5bf2a8 | 5060 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5061 | && handle_no_resumed (ecs)) |
5062 | return; | |
0e5bf2a8 | 5063 | |
5b6d1e4f PA |
5064 | /* Cache the last target/ptid/waitstatus. */ |
5065 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5066 | |
ca005067 | 5067 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5068 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5069 | |
0e5bf2a8 PA |
5070 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
5071 | { | |
5072 | /* No unwaited-for children left. IOW, all resumed children | |
5073 | have exited. */ | |
0e5bf2a8 | 5074 | stop_print_frame = 0; |
22bcd14b | 5075 | stop_waiting (ecs); |
0e5bf2a8 PA |
5076 | return; |
5077 | } | |
5078 | ||
8c90c137 | 5079 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 5080 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 | 5081 | { |
5b6d1e4f | 5082 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5083 | /* If it's a new thread, add it to the thread database. */ |
5084 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5085 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5086 | |
5087 | /* Disable range stepping. If the next step request could use a | |
5088 | range, this will be end up re-enabled then. */ | |
5089 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5090 | } |
88ed393a JK |
5091 | |
5092 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 5093 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
5094 | |
5095 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5096 | reinit_frame_cache (); | |
5097 | ||
28736962 PA |
5098 | breakpoint_retire_moribund (); |
5099 | ||
2b009048 DJ |
5100 | /* First, distinguish signals caused by the debugger from signals |
5101 | that have to do with the program's own actions. Note that | |
5102 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5103 | on the operating system version. Here we detect when a SIGILL or | |
5104 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5105 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5106 | when we're trying to execute a breakpoint instruction on a | |
5107 | non-executable stack. This happens for call dummy breakpoints | |
5108 | for architectures like SPARC that place call dummies on the | |
5109 | stack. */ | |
2b009048 | 5110 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
5111 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
5112 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
5113 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 5114 | { |
00431a78 | 5115 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5116 | |
a01bda52 | 5117 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5118 | regcache_read_pc (regcache))) |
5119 | { | |
4100594e | 5120 | infrun_log_debug ("Treating signal as SIGTRAP"); |
a493e3e2 | 5121 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 5122 | } |
2b009048 DJ |
5123 | } |
5124 | ||
293b3ebc | 5125 | mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws); |
8c90c137 | 5126 | |
488f131b JB |
5127 | switch (ecs->ws.kind) |
5128 | { | |
5129 | case TARGET_WAITKIND_LOADED: | |
00431a78 | 5130 | context_switch (ecs); |
b0f4b84b DJ |
5131 | /* Ignore gracefully during startup of the inferior, as it might |
5132 | be the shell which has just loaded some objects, otherwise | |
5133 | add the symbols for the newly loaded objects. Also ignore at | |
5134 | the beginning of an attach or remote session; we will query | |
5135 | the full list of libraries once the connection is | |
5136 | established. */ | |
4f5d7f63 | 5137 | |
00431a78 | 5138 | stop_soon = get_inferior_stop_soon (ecs); |
c0236d92 | 5139 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 5140 | { |
edcc5120 TT |
5141 | struct regcache *regcache; |
5142 | ||
00431a78 | 5143 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 TT |
5144 | |
5145 | handle_solib_event (); | |
5146 | ||
5147 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 5148 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
5149 | ecs->event_thread->suspend.stop_pc, |
5150 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 5151 | |
c65d6b55 PA |
5152 | if (handle_stop_requested (ecs)) |
5153 | return; | |
5154 | ||
ce12b012 | 5155 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
5156 | { |
5157 | /* A catchpoint triggered. */ | |
94c57d6a PA |
5158 | process_event_stop_test (ecs); |
5159 | return; | |
edcc5120 | 5160 | } |
488f131b | 5161 | |
b0f4b84b DJ |
5162 | /* If requested, stop when the dynamic linker notifies |
5163 | gdb of events. This allows the user to get control | |
5164 | and place breakpoints in initializer routines for | |
5165 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 5166 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
5167 | if (stop_on_solib_events) |
5168 | { | |
55409f9d DJ |
5169 | /* Make sure we print "Stopped due to solib-event" in |
5170 | normal_stop. */ | |
5171 | stop_print_frame = 1; | |
5172 | ||
22bcd14b | 5173 | stop_waiting (ecs); |
b0f4b84b DJ |
5174 | return; |
5175 | } | |
488f131b | 5176 | } |
b0f4b84b DJ |
5177 | |
5178 | /* If we are skipping through a shell, or through shared library | |
5179 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 5180 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
5181 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
5182 | { | |
74960c60 VP |
5183 | /* Loading of shared libraries might have changed breakpoint |
5184 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 5185 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 5186 | insert_breakpoints (); |
64ce06e4 | 5187 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
5188 | prepare_to_wait (ecs); |
5189 | return; | |
5190 | } | |
5191 | ||
5c09a2c5 PA |
5192 | /* But stop if we're attaching or setting up a remote |
5193 | connection. */ | |
5194 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5195 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5196 | { | |
4100594e | 5197 | infrun_log_debug ("quietly stopped"); |
22bcd14b | 5198 | stop_waiting (ecs); |
5c09a2c5 PA |
5199 | return; |
5200 | } | |
5201 | ||
5202 | internal_error (__FILE__, __LINE__, | |
5203 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 5204 | |
488f131b | 5205 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5206 | if (handle_stop_requested (ecs)) |
5207 | return; | |
00431a78 | 5208 | context_switch (ecs); |
64ce06e4 | 5209 | resume (GDB_SIGNAL_0); |
488f131b JB |
5210 | prepare_to_wait (ecs); |
5211 | return; | |
c5aa993b | 5212 | |
65706a29 | 5213 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5214 | if (handle_stop_requested (ecs)) |
5215 | return; | |
00431a78 | 5216 | context_switch (ecs); |
65706a29 PA |
5217 | if (!switch_back_to_stepped_thread (ecs)) |
5218 | keep_going (ecs); | |
5219 | return; | |
5220 | ||
488f131b | 5221 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5222 | case TARGET_WAITKIND_SIGNALLED: |
fb66883a | 5223 | inferior_ptid = ecs->ptid; |
5b6d1e4f | 5224 | set_current_inferior (find_inferior_ptid (ecs->target, ecs->ptid)); |
6c95b8df PA |
5225 | set_current_program_space (current_inferior ()->pspace); |
5226 | handle_vfork_child_exec_or_exit (0); | |
223ffa71 | 5227 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5228 | |
0c557179 SDJ |
5229 | /* Clearing any previous state of convenience variables. */ |
5230 | clear_exit_convenience_vars (); | |
5231 | ||
940c3c06 PA |
5232 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5233 | { | |
5234 | /* Record the exit code in the convenience variable $_exitcode, so | |
5235 | that the user can inspect this again later. */ | |
5236 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5237 | (LONGEST) ecs->ws.value.integer); | |
5238 | ||
5239 | /* Also record this in the inferior itself. */ | |
5240 | current_inferior ()->has_exit_code = 1; | |
5241 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5242 | |
98eb56a4 PA |
5243 | /* Support the --return-child-result option. */ |
5244 | return_child_result_value = ecs->ws.value.integer; | |
5245 | ||
76727919 | 5246 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
5247 | } |
5248 | else | |
0c557179 | 5249 | { |
00431a78 | 5250 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5251 | |
5252 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5253 | { | |
5254 | /* Set the value of the internal variable $_exitsignal, | |
5255 | which holds the signal uncaught by the inferior. */ | |
5256 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5257 | gdbarch_gdb_signal_to_target (gdbarch, | |
5258 | ecs->ws.value.sig)); | |
5259 | } | |
5260 | else | |
5261 | { | |
5262 | /* We don't have access to the target's method used for | |
5263 | converting between signal numbers (GDB's internal | |
5264 | representation <-> target's representation). | |
5265 | Therefore, we cannot do a good job at displaying this | |
5266 | information to the user. It's better to just warn | |
5267 | her about it (if infrun debugging is enabled), and | |
5268 | give up. */ | |
4100594e SM |
5269 | infrun_log_debug ("Cannot fill $_exitsignal with the correct " |
5270 | "signal number."); | |
0c557179 SDJ |
5271 | } |
5272 | ||
76727919 | 5273 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 5274 | } |
8cf64490 | 5275 | |
488f131b | 5276 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5277 | target_mourn_inferior (inferior_ptid); |
488f131b | 5278 | stop_print_frame = 0; |
22bcd14b | 5279 | stop_waiting (ecs); |
488f131b | 5280 | return; |
c5aa993b | 5281 | |
488f131b | 5282 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5283 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5284 | /* Check whether the inferior is displaced stepping. */ |
5285 | { | |
00431a78 | 5286 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5287 | struct gdbarch *gdbarch = regcache->arch (); |
e2d96639 YQ |
5288 | |
5289 | /* If checking displaced stepping is supported, and thread | |
5290 | ecs->ptid is displaced stepping. */ | |
e088209c | 5291 | if (displaced_step_in_progress (ecs->event_thread)) |
e2d96639 YQ |
5292 | { |
5293 | struct inferior *parent_inf | |
5b6d1e4f | 5294 | = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 YQ |
5295 | struct regcache *child_regcache; |
5296 | CORE_ADDR parent_pc; | |
5297 | ||
d8d83535 SM |
5298 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) |
5299 | { | |
e088209c SM |
5300 | // struct displaced_step_inferior_state *displaced |
5301 | // = get_displaced_stepping_state (parent_inf); | |
d8d83535 SM |
5302 | |
5303 | /* Restore scratch pad for child process. */ | |
e088209c SM |
5304 | //displaced_step_restore (displaced, ecs->ws.value.related_pid); |
5305 | // FIXME: we should restore all the buffers that were currently in use | |
d8d83535 SM |
5306 | } |
5307 | ||
e2d96639 YQ |
5308 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, |
5309 | indicating that the displaced stepping of syscall instruction | |
5310 | has been done. Perform cleanup for parent process here. Note | |
5311 | that this operation also cleans up the child process for vfork, | |
5312 | because their pages are shared. */ | |
e088209c | 5313 | displaced_step_finish (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5314 | /* Start a new step-over in another thread if there's one |
5315 | that needs it. */ | |
5316 | start_step_over (); | |
e2d96639 | 5317 | |
e2d96639 YQ |
5318 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5319 | the child's PC is also within the scratchpad. Set the child's PC | |
5320 | to the parent's PC value, which has already been fixed up. | |
5321 | FIXME: we use the parent's aspace here, although we're touching | |
5322 | the child, because the child hasn't been added to the inferior | |
5323 | list yet at this point. */ | |
5324 | ||
5325 | child_regcache | |
5b6d1e4f PA |
5326 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
5327 | ecs->ws.value.related_pid, | |
e2d96639 YQ |
5328 | gdbarch, |
5329 | parent_inf->aspace); | |
5330 | /* Read PC value of parent process. */ | |
5331 | parent_pc = regcache_read_pc (regcache); | |
5332 | ||
5333 | if (debug_displaced) | |
5334 | fprintf_unfiltered (gdb_stdlog, | |
5335 | "displaced: write child pc from %s to %s\n", | |
5336 | paddress (gdbarch, | |
5337 | regcache_read_pc (child_regcache)), | |
5338 | paddress (gdbarch, parent_pc)); | |
5339 | ||
5340 | regcache_write_pc (child_regcache, parent_pc); | |
5341 | } | |
5342 | } | |
5343 | ||
00431a78 | 5344 | context_switch (ecs); |
5a2901d9 | 5345 | |
b242c3c2 PA |
5346 | /* Immediately detach breakpoints from the child before there's |
5347 | any chance of letting the user delete breakpoints from the | |
5348 | breakpoint lists. If we don't do this early, it's easy to | |
5349 | leave left over traps in the child, vis: "break foo; catch | |
5350 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5351 | the fork on the last `continue', and by that time the | |
5352 | breakpoint at "foo" is long gone from the breakpoint table. | |
5353 | If we vforked, then we don't need to unpatch here, since both | |
5354 | parent and child are sharing the same memory pages; we'll | |
5355 | need to unpatch at follow/detach time instead to be certain | |
5356 | that new breakpoints added between catchpoint hit time and | |
5357 | vfork follow are detached. */ | |
5358 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5359 | { | |
b242c3c2 PA |
5360 | /* This won't actually modify the breakpoint list, but will |
5361 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5362 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5363 | } |
5364 | ||
34b7e8a6 | 5365 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5366 | |
e58b0e63 PA |
5367 | /* In case the event is caught by a catchpoint, remember that |
5368 | the event is to be followed at the next resume of the thread, | |
5369 | and not immediately. */ | |
5370 | ecs->event_thread->pending_follow = ecs->ws; | |
5371 | ||
f2ffa92b PA |
5372 | ecs->event_thread->suspend.stop_pc |
5373 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 5374 | |
16c381f0 | 5375 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5376 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5377 | ecs->event_thread->suspend.stop_pc, |
5378 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 5379 | |
c65d6b55 PA |
5380 | if (handle_stop_requested (ecs)) |
5381 | return; | |
5382 | ||
ce12b012 PA |
5383 | /* If no catchpoint triggered for this, then keep going. Note |
5384 | that we're interested in knowing the bpstat actually causes a | |
5385 | stop, not just if it may explain the signal. Software | |
5386 | watchpoints, for example, always appear in the bpstat. */ | |
5387 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5388 | { |
5ab2fbf1 | 5389 | bool follow_child |
3e43a32a | 5390 | = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 5391 | |
a493e3e2 | 5392 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 | 5393 | |
5b6d1e4f PA |
5394 | process_stratum_target *targ |
5395 | = ecs->event_thread->inf->process_target (); | |
5396 | ||
5ab2fbf1 | 5397 | bool should_resume = follow_fork (); |
e58b0e63 | 5398 | |
5b6d1e4f PA |
5399 | /* Note that one of these may be an invalid pointer, |
5400 | depending on detach_fork. */ | |
00431a78 | 5401 | thread_info *parent = ecs->event_thread; |
5b6d1e4f PA |
5402 | thread_info *child |
5403 | = find_thread_ptid (targ, ecs->ws.value.related_pid); | |
6c95b8df | 5404 | |
a2077e25 PA |
5405 | /* At this point, the parent is marked running, and the |
5406 | child is marked stopped. */ | |
5407 | ||
5408 | /* If not resuming the parent, mark it stopped. */ | |
5409 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5410 | parent->set_running (false); |
a2077e25 PA |
5411 | |
5412 | /* If resuming the child, mark it running. */ | |
5413 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5414 | child->set_running (true); |
a2077e25 | 5415 | |
6c95b8df | 5416 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5417 | if (!detach_fork && (non_stop |
5418 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5419 | { |
5420 | if (follow_child) | |
5421 | switch_to_thread (parent); | |
5422 | else | |
5423 | switch_to_thread (child); | |
5424 | ||
5425 | ecs->event_thread = inferior_thread (); | |
5426 | ecs->ptid = inferior_ptid; | |
5427 | keep_going (ecs); | |
5428 | } | |
5429 | ||
5430 | if (follow_child) | |
5431 | switch_to_thread (child); | |
5432 | else | |
5433 | switch_to_thread (parent); | |
5434 | ||
e58b0e63 PA |
5435 | ecs->event_thread = inferior_thread (); |
5436 | ecs->ptid = inferior_ptid; | |
5437 | ||
5438 | if (should_resume) | |
5439 | keep_going (ecs); | |
5440 | else | |
22bcd14b | 5441 | stop_waiting (ecs); |
04e68871 DJ |
5442 | return; |
5443 | } | |
94c57d6a PA |
5444 | process_event_stop_test (ecs); |
5445 | return; | |
488f131b | 5446 | |
6c95b8df PA |
5447 | case TARGET_WAITKIND_VFORK_DONE: |
5448 | /* Done with the shared memory region. Re-insert breakpoints in | |
5449 | the parent, and keep going. */ | |
5450 | ||
00431a78 | 5451 | context_switch (ecs); |
6c95b8df PA |
5452 | |
5453 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5454 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5455 | |
5456 | if (handle_stop_requested (ecs)) | |
5457 | return; | |
5458 | ||
6c95b8df PA |
5459 | /* This also takes care of reinserting breakpoints in the |
5460 | previously locked inferior. */ | |
5461 | keep_going (ecs); | |
5462 | return; | |
5463 | ||
488f131b | 5464 | case TARGET_WAITKIND_EXECD: |
488f131b | 5465 | |
cbd2b4e3 PA |
5466 | /* Note we can't read registers yet (the stop_pc), because we |
5467 | don't yet know the inferior's post-exec architecture. | |
5468 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5469 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5470 | |
6c95b8df PA |
5471 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5472 | handle_vfork_child_exec_or_exit (1); | |
5473 | ||
795e548f PA |
5474 | /* This causes the eventpoints and symbol table to be reset. |
5475 | Must do this now, before trying to determine whether to | |
5476 | stop. */ | |
71b43ef8 | 5477 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5478 | |
17d8546e DB |
5479 | /* In follow_exec we may have deleted the original thread and |
5480 | created a new one. Make sure that the event thread is the | |
5481 | execd thread for that case (this is a nop otherwise). */ | |
5482 | ecs->event_thread = inferior_thread (); | |
5483 | ||
f2ffa92b PA |
5484 | ecs->event_thread->suspend.stop_pc |
5485 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5486 | |
16c381f0 | 5487 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5488 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5489 | ecs->event_thread->suspend.stop_pc, |
5490 | ecs->event_thread, &ecs->ws); | |
795e548f | 5491 | |
71b43ef8 PA |
5492 | /* Note that this may be referenced from inside |
5493 | bpstat_stop_status above, through inferior_has_execd. */ | |
5494 | xfree (ecs->ws.value.execd_pathname); | |
5495 | ecs->ws.value.execd_pathname = NULL; | |
5496 | ||
c65d6b55 PA |
5497 | if (handle_stop_requested (ecs)) |
5498 | return; | |
5499 | ||
04e68871 | 5500 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5501 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5502 | { |
a493e3e2 | 5503 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5504 | keep_going (ecs); |
5505 | return; | |
5506 | } | |
94c57d6a PA |
5507 | process_event_stop_test (ecs); |
5508 | return; | |
488f131b | 5509 | |
b4dc5ffa MK |
5510 | /* Be careful not to try to gather much state about a thread |
5511 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5512 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5513 | /* Getting the current syscall number. */ |
94c57d6a PA |
5514 | if (handle_syscall_event (ecs) == 0) |
5515 | process_event_stop_test (ecs); | |
5516 | return; | |
c906108c | 5517 | |
488f131b JB |
5518 | /* Before examining the threads further, step this thread to |
5519 | get it entirely out of the syscall. (We get notice of the | |
5520 | event when the thread is just on the verge of exiting a | |
5521 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5522 | into user code.) */ |
488f131b | 5523 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5524 | if (handle_syscall_event (ecs) == 0) |
5525 | process_event_stop_test (ecs); | |
5526 | return; | |
c906108c | 5527 | |
488f131b | 5528 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5529 | handle_signal_stop (ecs); |
5530 | return; | |
c906108c | 5531 | |
b2175913 MS |
5532 | case TARGET_WAITKIND_NO_HISTORY: |
5533 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5534 | |
d1988021 | 5535 | /* Switch to the stopped thread. */ |
00431a78 | 5536 | context_switch (ecs); |
4100594e | 5537 | infrun_log_debug ("stopped"); |
d1988021 | 5538 | |
34b7e8a6 | 5539 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5540 | ecs->event_thread->suspend.stop_pc |
5541 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5542 | |
5543 | if (handle_stop_requested (ecs)) | |
5544 | return; | |
5545 | ||
76727919 | 5546 | gdb::observers::no_history.notify (); |
22bcd14b | 5547 | stop_waiting (ecs); |
b2175913 | 5548 | return; |
488f131b | 5549 | } |
4f5d7f63 PA |
5550 | } |
5551 | ||
372316f1 PA |
5552 | /* Restart threads back to what they were trying to do back when we |
5553 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5554 | ignored. */ | |
4d9d9d04 PA |
5555 | |
5556 | static void | |
372316f1 PA |
5557 | restart_threads (struct thread_info *event_thread) |
5558 | { | |
372316f1 PA |
5559 | /* In case the instruction just stepped spawned a new thread. */ |
5560 | update_thread_list (); | |
5561 | ||
08036331 | 5562 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5563 | { |
f3f8ece4 PA |
5564 | switch_to_thread_no_regs (tp); |
5565 | ||
372316f1 PA |
5566 | if (tp == event_thread) |
5567 | { | |
4100594e SM |
5568 | infrun_log_debug ("restart threads: [%s] is event thread", |
5569 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5570 | continue; |
5571 | } | |
5572 | ||
5573 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5574 | { | |
4100594e SM |
5575 | infrun_log_debug ("restart threads: [%s] not meant to be running", |
5576 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5577 | continue; |
5578 | } | |
5579 | ||
5580 | if (tp->resumed) | |
5581 | { | |
4100594e SM |
5582 | infrun_log_debug ("restart threads: [%s] resumed", |
5583 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5584 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
5585 | continue; | |
5586 | } | |
5587 | ||
5588 | if (thread_is_in_step_over_chain (tp)) | |
5589 | { | |
4100594e SM |
5590 | infrun_log_debug ("restart threads: [%s] needs step-over", |
5591 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5592 | gdb_assert (!tp->resumed); |
5593 | continue; | |
5594 | } | |
5595 | ||
5596 | ||
5597 | if (tp->suspend.waitstatus_pending_p) | |
5598 | { | |
4100594e SM |
5599 | infrun_log_debug ("restart threads: [%s] has pending status", |
5600 | target_pid_to_str (tp->ptid).c_str ()); | |
719546c4 | 5601 | tp->resumed = true; |
372316f1 PA |
5602 | continue; |
5603 | } | |
5604 | ||
c65d6b55 PA |
5605 | gdb_assert (!tp->stop_requested); |
5606 | ||
372316f1 PA |
5607 | /* If some thread needs to start a step-over at this point, it |
5608 | should still be in the step-over queue, and thus skipped | |
5609 | above. */ | |
5610 | if (thread_still_needs_step_over (tp)) | |
5611 | { | |
5612 | internal_error (__FILE__, __LINE__, | |
5613 | "thread [%s] needs a step-over, but not in " | |
5614 | "step-over queue\n", | |
a068643d | 5615 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5616 | } |
5617 | ||
5618 | if (currently_stepping (tp)) | |
5619 | { | |
4100594e SM |
5620 | infrun_log_debug ("restart threads: [%s] was stepping", |
5621 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5622 | keep_going_stepped_thread (tp); |
5623 | } | |
5624 | else | |
5625 | { | |
5626 | struct execution_control_state ecss; | |
5627 | struct execution_control_state *ecs = &ecss; | |
5628 | ||
4100594e SM |
5629 | infrun_log_debug ("restart threads: [%s] continuing", |
5630 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 5631 | reset_ecs (ecs, tp); |
00431a78 | 5632 | switch_to_thread (tp); |
372316f1 PA |
5633 | keep_going_pass_signal (ecs); |
5634 | } | |
5635 | } | |
5636 | } | |
5637 | ||
5638 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5639 | a pending waitstatus. */ | |
5640 | ||
5641 | static int | |
5642 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5643 | void *arg) | |
5644 | { | |
5645 | return (tp->resumed | |
5646 | && tp->suspend.waitstatus_pending_p); | |
5647 | } | |
5648 | ||
5649 | /* Called when we get an event that may finish an in-line or | |
5650 | out-of-line (displaced stepping) step-over started previously. | |
5651 | Return true if the event is processed and we should go back to the | |
5652 | event loop; false if the caller should continue processing the | |
5653 | event. */ | |
5654 | ||
5655 | static int | |
4d9d9d04 PA |
5656 | finish_step_over (struct execution_control_state *ecs) |
5657 | { | |
372316f1 PA |
5658 | int had_step_over_info; |
5659 | ||
e088209c SM |
5660 | displaced_step_finish (ecs->event_thread, |
5661 | ecs->event_thread->suspend.stop_signal); | |
4d9d9d04 | 5662 | |
372316f1 PA |
5663 | had_step_over_info = step_over_info_valid_p (); |
5664 | ||
5665 | if (had_step_over_info) | |
4d9d9d04 PA |
5666 | { |
5667 | /* If we're stepping over a breakpoint with all threads locked, | |
5668 | then only the thread that was stepped should be reporting | |
5669 | back an event. */ | |
5670 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5671 | ||
c65d6b55 | 5672 | clear_step_over_info (); |
4d9d9d04 PA |
5673 | } |
5674 | ||
fbea99ea | 5675 | if (!target_is_non_stop_p ()) |
372316f1 | 5676 | return 0; |
4d9d9d04 PA |
5677 | |
5678 | /* Start a new step-over in another thread if there's one that | |
5679 | needs it. */ | |
5680 | start_step_over (); | |
372316f1 PA |
5681 | |
5682 | /* If we were stepping over a breakpoint before, and haven't started | |
5683 | a new in-line step-over sequence, then restart all other threads | |
5684 | (except the event thread). We can't do this in all-stop, as then | |
5685 | e.g., we wouldn't be able to issue any other remote packet until | |
5686 | these other threads stop. */ | |
5687 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5688 | { | |
5689 | struct thread_info *pending; | |
5690 | ||
5691 | /* If we only have threads with pending statuses, the restart | |
5692 | below won't restart any thread and so nothing re-inserts the | |
5693 | breakpoint we just stepped over. But we need it inserted | |
5694 | when we later process the pending events, otherwise if | |
5695 | another thread has a pending event for this breakpoint too, | |
5696 | we'd discard its event (because the breakpoint that | |
5697 | originally caused the event was no longer inserted). */ | |
00431a78 | 5698 | context_switch (ecs); |
372316f1 PA |
5699 | insert_breakpoints (); |
5700 | ||
5701 | restart_threads (ecs->event_thread); | |
5702 | ||
5703 | /* If we have events pending, go through handle_inferior_event | |
5704 | again, picking up a pending event at random. This avoids | |
5705 | thread starvation. */ | |
5706 | ||
5707 | /* But not if we just stepped over a watchpoint in order to let | |
5708 | the instruction execute so we can evaluate its expression. | |
5709 | The set of watchpoints that triggered is recorded in the | |
5710 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5711 | If we processed another event first, that other event could | |
5712 | clobber this info. */ | |
5713 | if (ecs->event_thread->stepping_over_watchpoint) | |
5714 | return 0; | |
5715 | ||
5716 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5717 | NULL); | |
5718 | if (pending != NULL) | |
5719 | { | |
5720 | struct thread_info *tp = ecs->event_thread; | |
5721 | struct regcache *regcache; | |
5722 | ||
4100594e SM |
5723 | infrun_log_debug ("found resumed threads with " |
5724 | "pending events, saving status"); | |
372316f1 PA |
5725 | |
5726 | gdb_assert (pending != tp); | |
5727 | ||
5728 | /* Record the event thread's event for later. */ | |
5729 | save_waitstatus (tp, &ecs->ws); | |
5730 | /* This was cleared early, by handle_inferior_event. Set it | |
5731 | so this pending event is considered by | |
5732 | do_target_wait. */ | |
719546c4 | 5733 | tp->resumed = true; |
372316f1 PA |
5734 | |
5735 | gdb_assert (!tp->executing); | |
5736 | ||
00431a78 | 5737 | regcache = get_thread_regcache (tp); |
372316f1 PA |
5738 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
5739 | ||
4100594e SM |
5740 | infrun_log_debug ("saved stop_pc=%s for %s " |
5741 | "(currently_stepping=%d)\n", | |
5742 | paddress (target_gdbarch (), | |
5743 | tp->suspend.stop_pc), | |
5744 | target_pid_to_str (tp->ptid).c_str (), | |
5745 | currently_stepping (tp)); | |
372316f1 PA |
5746 | |
5747 | /* This in-line step-over finished; clear this so we won't | |
5748 | start a new one. This is what handle_signal_stop would | |
5749 | do, if we returned false. */ | |
5750 | tp->stepping_over_breakpoint = 0; | |
5751 | ||
5752 | /* Wake up the event loop again. */ | |
5753 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5754 | ||
5755 | prepare_to_wait (ecs); | |
5756 | return 1; | |
5757 | } | |
5758 | } | |
5759 | ||
5760 | return 0; | |
4d9d9d04 PA |
5761 | } |
5762 | ||
4f5d7f63 PA |
5763 | /* Come here when the program has stopped with a signal. */ |
5764 | ||
5765 | static void | |
5766 | handle_signal_stop (struct execution_control_state *ecs) | |
5767 | { | |
5768 | struct frame_info *frame; | |
5769 | struct gdbarch *gdbarch; | |
5770 | int stopped_by_watchpoint; | |
5771 | enum stop_kind stop_soon; | |
5772 | int random_signal; | |
c906108c | 5773 | |
f0407826 DE |
5774 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5775 | ||
c65d6b55 PA |
5776 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5777 | ||
f0407826 DE |
5778 | /* Do we need to clean up the state of a thread that has |
5779 | completed a displaced single-step? (Doing so usually affects | |
5780 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5781 | if (finish_step_over (ecs)) |
5782 | return; | |
f0407826 DE |
5783 | |
5784 | /* If we either finished a single-step or hit a breakpoint, but | |
5785 | the user wanted this thread to be stopped, pretend we got a | |
5786 | SIG0 (generic unsignaled stop). */ | |
5787 | if (ecs->event_thread->stop_requested | |
5788 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5789 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5790 | |
f2ffa92b PA |
5791 | ecs->event_thread->suspend.stop_pc |
5792 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 5793 | |
527159b7 | 5794 | if (debug_infrun) |
237fc4c9 | 5795 | { |
00431a78 | 5796 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 5797 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 5798 | |
f3f8ece4 | 5799 | switch_to_thread (ecs->event_thread); |
5af949e3 | 5800 | |
4100594e SM |
5801 | infrun_log_debug ("stop_pc=%s", |
5802 | paddress (reg_gdbarch, | |
5803 | ecs->event_thread->suspend.stop_pc)); | |
d92524f1 | 5804 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5805 | { |
5806 | CORE_ADDR addr; | |
abbb1732 | 5807 | |
4100594e | 5808 | infrun_log_debug ("stopped by watchpoint"); |
237fc4c9 | 5809 | |
8b88a78e | 5810 | if (target_stopped_data_address (current_top_target (), &addr)) |
4100594e SM |
5811 | infrun_log_debug ("stopped data address=%s", |
5812 | paddress (reg_gdbarch, addr)); | |
237fc4c9 | 5813 | else |
4100594e | 5814 | infrun_log_debug ("(no data address available)"); |
237fc4c9 PA |
5815 | } |
5816 | } | |
527159b7 | 5817 | |
36fa8042 PA |
5818 | /* This is originated from start_remote(), start_inferior() and |
5819 | shared libraries hook functions. */ | |
00431a78 | 5820 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
5821 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
5822 | { | |
00431a78 | 5823 | context_switch (ecs); |
4100594e | 5824 | infrun_log_debug ("quietly stopped"); |
36fa8042 | 5825 | stop_print_frame = 1; |
22bcd14b | 5826 | stop_waiting (ecs); |
36fa8042 PA |
5827 | return; |
5828 | } | |
5829 | ||
36fa8042 PA |
5830 | /* This originates from attach_command(). We need to overwrite |
5831 | the stop_signal here, because some kernels don't ignore a | |
5832 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5833 | See more comments in inferior.h. On the other hand, if we | |
5834 | get a non-SIGSTOP, report it to the user - assume the backend | |
5835 | will handle the SIGSTOP if it should show up later. | |
5836 | ||
5837 | Also consider that the attach is complete when we see a | |
5838 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5839 | target extended-remote report it instead of a SIGSTOP | |
5840 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5841 | signal, so this is no exception. | |
5842 | ||
5843 | Also consider that the attach is complete when we see a | |
5844 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5845 | the target to stop all threads of the inferior, in case the | |
5846 | low level attach operation doesn't stop them implicitly. If | |
5847 | they weren't stopped implicitly, then the stub will report a | |
5848 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5849 | other than GDB's request. */ | |
5850 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5851 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5852 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5853 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5854 | { | |
5855 | stop_print_frame = 1; | |
22bcd14b | 5856 | stop_waiting (ecs); |
36fa8042 PA |
5857 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5858 | return; | |
5859 | } | |
5860 | ||
488f131b | 5861 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 | 5862 | so, then switch to that thread. */ |
d7e15655 | 5863 | if (ecs->ptid != inferior_ptid) |
488f131b | 5864 | { |
4100594e | 5865 | infrun_log_debug ("context switch"); |
527159b7 | 5866 | |
00431a78 | 5867 | context_switch (ecs); |
c5aa993b | 5868 | |
9a4105ab | 5869 | if (deprecated_context_hook) |
00431a78 | 5870 | deprecated_context_hook (ecs->event_thread->global_num); |
488f131b | 5871 | } |
c906108c | 5872 | |
568d6575 UW |
5873 | /* At this point, get hold of the now-current thread's frame. */ |
5874 | frame = get_current_frame (); | |
5875 | gdbarch = get_frame_arch (frame); | |
5876 | ||
2adfaa28 | 5877 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5878 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5879 | { |
af48d08f | 5880 | struct regcache *regcache; |
af48d08f | 5881 | CORE_ADDR pc; |
2adfaa28 | 5882 | |
00431a78 | 5883 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
5884 | const address_space *aspace = regcache->aspace (); |
5885 | ||
af48d08f | 5886 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 5887 | |
af48d08f PA |
5888 | /* However, before doing so, if this single-step breakpoint was |
5889 | actually for another thread, set this thread up for moving | |
5890 | past it. */ | |
5891 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5892 | aspace, pc)) | |
5893 | { | |
5894 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 | 5895 | { |
4100594e SM |
5896 | infrun_log_debug ("[%s] hit another thread's single-step " |
5897 | "breakpoint", | |
5898 | target_pid_to_str (ecs->ptid).c_str ()); | |
af48d08f PA |
5899 | ecs->hit_singlestep_breakpoint = 1; |
5900 | } | |
5901 | } | |
5902 | else | |
5903 | { | |
4100594e SM |
5904 | infrun_log_debug ("[%s] hit its single-step breakpoint", |
5905 | target_pid_to_str (ecs->ptid).c_str ()); | |
2adfaa28 | 5906 | } |
488f131b | 5907 | } |
af48d08f | 5908 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5909 | |
963f9c80 PA |
5910 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5911 | && ecs->event_thread->control.trap_expected | |
5912 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5913 | stopped_by_watchpoint = 0; |
5914 | else | |
5915 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5916 | ||
5917 | /* If necessary, step over this watchpoint. We'll be back to display | |
5918 | it in a moment. */ | |
5919 | if (stopped_by_watchpoint | |
d92524f1 | 5920 | && (target_have_steppable_watchpoint |
568d6575 | 5921 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5922 | { |
488f131b JB |
5923 | /* At this point, we are stopped at an instruction which has |
5924 | attempted to write to a piece of memory under control of | |
5925 | a watchpoint. The instruction hasn't actually executed | |
5926 | yet. If we were to evaluate the watchpoint expression | |
5927 | now, we would get the old value, and therefore no change | |
5928 | would seem to have occurred. | |
5929 | ||
5930 | In order to make watchpoints work `right', we really need | |
5931 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5932 | watchpoint expression. We do this by single-stepping the |
5933 | target. | |
5934 | ||
7f89fd65 | 5935 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5936 | it. For example, the PA can (with some kernel cooperation) |
5937 | single step over a watchpoint without disabling the watchpoint. | |
5938 | ||
5939 | It is far more common to need to disable a watchpoint to step | |
5940 | the inferior over it. If we have non-steppable watchpoints, | |
5941 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5942 | disable all watchpoints. |
5943 | ||
5944 | Any breakpoint at PC must also be stepped over -- if there's | |
5945 | one, it will have already triggered before the watchpoint | |
5946 | triggered, and we either already reported it to the user, or | |
5947 | it didn't cause a stop and we called keep_going. In either | |
5948 | case, if there was a breakpoint at PC, we must be trying to | |
5949 | step past it. */ | |
5950 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5951 | keep_going (ecs); | |
488f131b JB |
5952 | return; |
5953 | } | |
5954 | ||
4e1c45ea | 5955 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5956 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5957 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5958 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5959 | stop_print_frame = 1; |
488f131b | 5960 | stopped_by_random_signal = 0; |
ddfe970e | 5961 | bpstat stop_chain = NULL; |
488f131b | 5962 | |
edb3359d DJ |
5963 | /* Hide inlined functions starting here, unless we just performed stepi or |
5964 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5965 | inline function call sites). */ | |
16c381f0 | 5966 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 5967 | { |
00431a78 PA |
5968 | const address_space *aspace |
5969 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
5970 | |
5971 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5972 | determine that the address is one where functions cannot have | |
5973 | been inlined. This improves performance with inferiors that | |
5974 | load a lot of shared libraries, because the solib event | |
5975 | breakpoint is defined as the address of a function (i.e. not | |
5976 | inline). Note that we have to check the previous PC as well | |
5977 | as the current one to catch cases when we have just | |
5978 | single-stepped off a breakpoint prior to reinstating it. | |
5979 | Note that we're assuming that the code we single-step to is | |
5980 | not inline, but that's not definitive: there's nothing | |
5981 | preventing the event breakpoint function from containing | |
5982 | inlined code, and the single-step ending up there. If the | |
5983 | user had set a breakpoint on that inlined code, the missing | |
5984 | skip_inline_frames call would break things. Fortunately | |
5985 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
5986 | if (!pc_at_non_inline_function (aspace, |
5987 | ecs->event_thread->suspend.stop_pc, | |
5988 | &ecs->ws) | |
a210c238 MR |
5989 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5990 | && ecs->event_thread->control.trap_expected | |
5991 | && pc_at_non_inline_function (aspace, | |
5992 | ecs->event_thread->prev_pc, | |
09ac7c10 | 5993 | &ecs->ws))) |
1c5a993e | 5994 | { |
f2ffa92b PA |
5995 | stop_chain = build_bpstat_chain (aspace, |
5996 | ecs->event_thread->suspend.stop_pc, | |
5997 | &ecs->ws); | |
00431a78 | 5998 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
5999 | |
6000 | /* Re-fetch current thread's frame in case that invalidated | |
6001 | the frame cache. */ | |
6002 | frame = get_current_frame (); | |
6003 | gdbarch = get_frame_arch (frame); | |
6004 | } | |
0574c78f | 6005 | } |
edb3359d | 6006 | |
a493e3e2 | 6007 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 6008 | && ecs->event_thread->control.trap_expected |
568d6575 | 6009 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6010 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6011 | { |
b50d7442 | 6012 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6013 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6014 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6015 | with a delay slot. It needs to be stepped twice, once for |
6016 | the instruction and once for the delay slot. */ | |
6017 | int step_through_delay | |
568d6575 | 6018 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6019 | |
4100594e SM |
6020 | if (step_through_delay) |
6021 | infrun_log_debug ("step through delay"); | |
6022 | ||
16c381f0 JK |
6023 | if (ecs->event_thread->control.step_range_end == 0 |
6024 | && step_through_delay) | |
3352ef37 AC |
6025 | { |
6026 | /* The user issued a continue when stopped at a breakpoint. | |
6027 | Set up for another trap and get out of here. */ | |
4e1c45ea | 6028 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6029 | keep_going (ecs); |
6030 | return; | |
6031 | } | |
6032 | else if (step_through_delay) | |
6033 | { | |
6034 | /* The user issued a step when stopped at a breakpoint. | |
6035 | Maybe we should stop, maybe we should not - the delay | |
6036 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6037 | case, don't decide that here, just set |
6038 | ecs->stepping_over_breakpoint, making sure we | |
6039 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6040 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6041 | } |
6042 | } | |
6043 | ||
ab04a2af TT |
6044 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6045 | handles this event. */ | |
6046 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6047 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
6048 | ecs->event_thread->suspend.stop_pc, |
6049 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 6050 | |
ab04a2af TT |
6051 | /* Following in case break condition called a |
6052 | function. */ | |
6053 | stop_print_frame = 1; | |
73dd234f | 6054 | |
ab04a2af TT |
6055 | /* This is where we handle "moribund" watchpoints. Unlike |
6056 | software breakpoints traps, hardware watchpoint traps are | |
6057 | always distinguishable from random traps. If no high-level | |
6058 | watchpoint is associated with the reported stop data address | |
6059 | anymore, then the bpstat does not explain the signal --- | |
6060 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6061 | set. */ | |
6062 | ||
4100594e | 6063 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
47591c29 | 6064 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6065 | GDB_SIGNAL_TRAP) |
ab04a2af | 6066 | && stopped_by_watchpoint) |
4100594e SM |
6067 | { |
6068 | infrun_log_debug ("no user watchpoint explains watchpoint SIGTRAP, " | |
6069 | "ignoring"); | |
6070 | } | |
73dd234f | 6071 | |
bac7d97b | 6072 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6073 | at one stage in the past included checks for an inferior |
6074 | function call's call dummy's return breakpoint. The original | |
6075 | comment, that went with the test, read: | |
03cebad2 | 6076 | |
ab04a2af TT |
6077 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6078 | another signal besides SIGTRAP, so check here as well as | |
6079 | above.'' | |
73dd234f | 6080 | |
ab04a2af TT |
6081 | If someone ever tries to get call dummys on a |
6082 | non-executable stack to work (where the target would stop | |
6083 | with something like a SIGSEGV), then those tests might need | |
6084 | to be re-instated. Given, however, that the tests were only | |
6085 | enabled when momentary breakpoints were not being used, I | |
6086 | suspect that it won't be the case. | |
488f131b | 6087 | |
ab04a2af TT |
6088 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6089 | be necessary for call dummies on a non-executable stack on | |
6090 | SPARC. */ | |
488f131b | 6091 | |
bac7d97b | 6092 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6093 | random_signal |
6094 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
6095 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 6096 | |
1cf4d951 PA |
6097 | /* Maybe this was a trap for a software breakpoint that has since |
6098 | been removed. */ | |
6099 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6100 | { | |
5133a315 LM |
6101 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
6102 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
6103 | { |
6104 | struct regcache *regcache; | |
6105 | int decr_pc; | |
6106 | ||
6107 | /* Re-adjust PC to what the program would see if GDB was not | |
6108 | debugging it. */ | |
00431a78 | 6109 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6110 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6111 | if (decr_pc != 0) |
6112 | { | |
07036511 TT |
6113 | gdb::optional<scoped_restore_tmpl<int>> |
6114 | restore_operation_disable; | |
1cf4d951 PA |
6115 | |
6116 | if (record_full_is_used ()) | |
07036511 TT |
6117 | restore_operation_disable.emplace |
6118 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6119 | |
f2ffa92b PA |
6120 | regcache_write_pc (regcache, |
6121 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
6122 | } |
6123 | } | |
6124 | else | |
6125 | { | |
6126 | /* A delayed software breakpoint event. Ignore the trap. */ | |
4100594e | 6127 | infrun_log_debug ("delayed software breakpoint trap, ignoring"); |
1cf4d951 PA |
6128 | random_signal = 0; |
6129 | } | |
6130 | } | |
6131 | ||
6132 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6133 | has since been removed. */ | |
6134 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6135 | { | |
6136 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
4100594e SM |
6137 | infrun_log_debug ("delayed hardware breakpoint/watchpoint " |
6138 | "trap, ignoring"); | |
1cf4d951 PA |
6139 | random_signal = 0; |
6140 | } | |
6141 | ||
bac7d97b PA |
6142 | /* If not, perhaps stepping/nexting can. */ |
6143 | if (random_signal) | |
6144 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6145 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6146 | |
2adfaa28 PA |
6147 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6148 | thread. Single-step breakpoints are transparent to the | |
6149 | breakpoints module. */ | |
6150 | if (random_signal) | |
6151 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6152 | ||
bac7d97b PA |
6153 | /* No? Perhaps we got a moribund watchpoint. */ |
6154 | if (random_signal) | |
6155 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6156 | |
c65d6b55 PA |
6157 | /* Always stop if the user explicitly requested this thread to |
6158 | remain stopped. */ | |
6159 | if (ecs->event_thread->stop_requested) | |
6160 | { | |
6161 | random_signal = 1; | |
4100594e | 6162 | infrun_log_debug ("user-requested stop"); |
c65d6b55 PA |
6163 | } |
6164 | ||
488f131b JB |
6165 | /* For the program's own signals, act according to |
6166 | the signal handling tables. */ | |
6167 | ||
ce12b012 | 6168 | if (random_signal) |
488f131b JB |
6169 | { |
6170 | /* Signal not for debugging purposes. */ | |
5b6d1e4f | 6171 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
c9737c08 | 6172 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6173 | |
4100594e SM |
6174 | infrun_log_debug ("random signal (%s)", |
6175 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6176 | |
488f131b JB |
6177 | stopped_by_random_signal = 1; |
6178 | ||
252fbfc8 PA |
6179 | /* Always stop on signals if we're either just gaining control |
6180 | of the program, or the user explicitly requested this thread | |
6181 | to remain stopped. */ | |
d6b48e9c | 6182 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6183 | || ecs->event_thread->stop_requested |
24291992 | 6184 | || (!inf->detaching |
16c381f0 | 6185 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 6186 | { |
22bcd14b | 6187 | stop_waiting (ecs); |
488f131b JB |
6188 | return; |
6189 | } | |
b57bacec PA |
6190 | |
6191 | /* Notify observers the signal has "handle print" set. Note we | |
6192 | returned early above if stopping; normal_stop handles the | |
6193 | printing in that case. */ | |
6194 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6195 | { | |
6196 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6197 | target_terminal::ours_for_output (); |
76727919 | 6198 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 6199 | target_terminal::inferior (); |
b57bacec | 6200 | } |
488f131b JB |
6201 | |
6202 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6203 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6204 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6205 | |
f2ffa92b | 6206 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 6207 | && ecs->event_thread->control.trap_expected |
8358c15c | 6208 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6209 | { |
6210 | /* We were just starting a new sequence, attempting to | |
6211 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6212 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6213 | of the stepping range so GDB needs to remember to, when |
6214 | the signal handler returns, resume stepping off that | |
6215 | breakpoint. */ | |
6216 | /* To simplify things, "continue" is forced to use the same | |
6217 | code paths as single-step - set a breakpoint at the | |
6218 | signal return address and then, once hit, step off that | |
6219 | breakpoint. */ | |
4100594e | 6220 | infrun_log_debug ("signal arrived while stepping over breakpoint"); |
d3169d93 | 6221 | |
2c03e5be | 6222 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6223 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6224 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6225 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6226 | |
6227 | /* If we were nexting/stepping some other thread, switch to | |
6228 | it, so that we don't continue it, losing control. */ | |
6229 | if (!switch_back_to_stepped_thread (ecs)) | |
6230 | keep_going (ecs); | |
9d799f85 | 6231 | return; |
68f53502 | 6232 | } |
9d799f85 | 6233 | |
e5f8a7cc | 6234 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
6235 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6236 | ecs->event_thread) | |
e5f8a7cc | 6237 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 6238 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6239 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6240 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6241 | { |
6242 | /* The inferior is about to take a signal that will take it | |
6243 | out of the single step range. Set a breakpoint at the | |
6244 | current PC (which is presumably where the signal handler | |
6245 | will eventually return) and then allow the inferior to | |
6246 | run free. | |
6247 | ||
6248 | Note that this is only needed for a signal delivered | |
6249 | while in the single-step range. Nested signals aren't a | |
6250 | problem as they eventually all return. */ | |
4100594e | 6251 | infrun_log_debug ("signal may take us out of single-step range"); |
237fc4c9 | 6252 | |
372316f1 | 6253 | clear_step_over_info (); |
2c03e5be | 6254 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6255 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6256 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6257 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6258 | keep_going (ecs); |
6259 | return; | |
d303a6c7 | 6260 | } |
9d799f85 | 6261 | |
85102364 | 6262 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6263 | when either there's a nested signal, or when there's a |
6264 | pending signal enabled just as the signal handler returns | |
6265 | (leaving the inferior at the step-resume-breakpoint without | |
6266 | actually executing it). Either way continue until the | |
6267 | breakpoint is really hit. */ | |
c447ac0b PA |
6268 | |
6269 | if (!switch_back_to_stepped_thread (ecs)) | |
6270 | { | |
4100594e | 6271 | infrun_log_debug ("random signal, keep going"); |
c447ac0b PA |
6272 | |
6273 | keep_going (ecs); | |
6274 | } | |
6275 | return; | |
488f131b | 6276 | } |
94c57d6a PA |
6277 | |
6278 | process_event_stop_test (ecs); | |
6279 | } | |
6280 | ||
6281 | /* Come here when we've got some debug event / signal we can explain | |
6282 | (IOW, not a random signal), and test whether it should cause a | |
6283 | stop, or whether we should resume the inferior (transparently). | |
6284 | E.g., could be a breakpoint whose condition evaluates false; we | |
6285 | could be still stepping within the line; etc. */ | |
6286 | ||
6287 | static void | |
6288 | process_event_stop_test (struct execution_control_state *ecs) | |
6289 | { | |
6290 | struct symtab_and_line stop_pc_sal; | |
6291 | struct frame_info *frame; | |
6292 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6293 | CORE_ADDR jmp_buf_pc; |
6294 | struct bpstat_what what; | |
94c57d6a | 6295 | |
cdaa5b73 | 6296 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6297 | |
cdaa5b73 PA |
6298 | frame = get_current_frame (); |
6299 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6300 | |
cdaa5b73 | 6301 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6302 | |
cdaa5b73 PA |
6303 | if (what.call_dummy) |
6304 | { | |
6305 | stop_stack_dummy = what.call_dummy; | |
6306 | } | |
186c406b | 6307 | |
243a9253 PA |
6308 | /* A few breakpoint types have callbacks associated (e.g., |
6309 | bp_jit_event). Run them now. */ | |
6310 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6311 | ||
cdaa5b73 PA |
6312 | /* If we hit an internal event that triggers symbol changes, the |
6313 | current frame will be invalidated within bpstat_what (e.g., if we | |
6314 | hit an internal solib event). Re-fetch it. */ | |
6315 | frame = get_current_frame (); | |
6316 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6317 | |
cdaa5b73 PA |
6318 | switch (what.main_action) |
6319 | { | |
6320 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6321 | /* If we hit the breakpoint at longjmp while stepping, we | |
6322 | install a momentary breakpoint at the target of the | |
6323 | jmp_buf. */ | |
186c406b | 6324 | |
4100594e | 6325 | infrun_log_debug ("BPSTAT_WHAT_SET_LONGJMP_RESUME"); |
186c406b | 6326 | |
cdaa5b73 | 6327 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6328 | |
cdaa5b73 PA |
6329 | if (what.is_longjmp) |
6330 | { | |
6331 | struct value *arg_value; | |
6332 | ||
6333 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6334 | then use it to extract the arguments. The destination PC | |
6335 | is the third argument to the probe. */ | |
6336 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6337 | if (arg_value) | |
8fa0c4f8 AA |
6338 | { |
6339 | jmp_buf_pc = value_as_address (arg_value); | |
6340 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6341 | } | |
cdaa5b73 PA |
6342 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6343 | || !gdbarch_get_longjmp_target (gdbarch, | |
6344 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6345 | { |
4100594e SM |
6346 | infrun_log_debug ("BPSTAT_WHAT_SET_LONGJMP_RESUME " |
6347 | "(!gdbarch_get_longjmp_target)"); | |
cdaa5b73 PA |
6348 | keep_going (ecs); |
6349 | return; | |
e2e4d78b | 6350 | } |
e2e4d78b | 6351 | |
cdaa5b73 PA |
6352 | /* Insert a breakpoint at resume address. */ |
6353 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6354 | } | |
6355 | else | |
6356 | check_exception_resume (ecs, frame); | |
6357 | keep_going (ecs); | |
6358 | return; | |
e81a37f7 | 6359 | |
cdaa5b73 PA |
6360 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6361 | { | |
6362 | struct frame_info *init_frame; | |
e81a37f7 | 6363 | |
cdaa5b73 | 6364 | /* There are several cases to consider. |
c906108c | 6365 | |
cdaa5b73 PA |
6366 | 1. The initiating frame no longer exists. In this case we |
6367 | must stop, because the exception or longjmp has gone too | |
6368 | far. | |
2c03e5be | 6369 | |
cdaa5b73 PA |
6370 | 2. The initiating frame exists, and is the same as the |
6371 | current frame. We stop, because the exception or longjmp | |
6372 | has been caught. | |
2c03e5be | 6373 | |
cdaa5b73 PA |
6374 | 3. The initiating frame exists and is different from the |
6375 | current frame. This means the exception or longjmp has | |
6376 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6377 | |
cdaa5b73 PA |
6378 | 4. longjmp breakpoint has been placed just to protect |
6379 | against stale dummy frames and user is not interested in | |
6380 | stopping around longjmps. */ | |
c5aa993b | 6381 | |
4100594e | 6382 | infrun_log_debug ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME"); |
c5aa993b | 6383 | |
cdaa5b73 PA |
6384 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6385 | != NULL); | |
6386 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6387 | |
cdaa5b73 PA |
6388 | if (what.is_longjmp) |
6389 | { | |
b67a2c6f | 6390 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6391 | |
cdaa5b73 | 6392 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6393 | { |
cdaa5b73 PA |
6394 | /* Case 4. */ |
6395 | keep_going (ecs); | |
6396 | return; | |
e5ef252a | 6397 | } |
cdaa5b73 | 6398 | } |
c5aa993b | 6399 | |
cdaa5b73 | 6400 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6401 | |
cdaa5b73 PA |
6402 | if (init_frame) |
6403 | { | |
6404 | struct frame_id current_id | |
6405 | = get_frame_id (get_current_frame ()); | |
6406 | if (frame_id_eq (current_id, | |
6407 | ecs->event_thread->initiating_frame)) | |
6408 | { | |
6409 | /* Case 2. Fall through. */ | |
6410 | } | |
6411 | else | |
6412 | { | |
6413 | /* Case 3. */ | |
6414 | keep_going (ecs); | |
6415 | return; | |
6416 | } | |
68f53502 | 6417 | } |
488f131b | 6418 | |
cdaa5b73 PA |
6419 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6420 | exists. */ | |
6421 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6422 | |
bdc36728 | 6423 | end_stepping_range (ecs); |
cdaa5b73 PA |
6424 | } |
6425 | return; | |
e5ef252a | 6426 | |
cdaa5b73 | 6427 | case BPSTAT_WHAT_SINGLE: |
4100594e | 6428 | infrun_log_debug ("BPSTAT_WHAT_SINGLE"); |
cdaa5b73 PA |
6429 | ecs->event_thread->stepping_over_breakpoint = 1; |
6430 | /* Still need to check other stuff, at least the case where we | |
6431 | are stepping and step out of the right range. */ | |
6432 | break; | |
e5ef252a | 6433 | |
cdaa5b73 | 6434 | case BPSTAT_WHAT_STEP_RESUME: |
4100594e | 6435 | infrun_log_debug ("BPSTAT_WHAT_STEP_RESUME"); |
e5ef252a | 6436 | |
cdaa5b73 PA |
6437 | delete_step_resume_breakpoint (ecs->event_thread); |
6438 | if (ecs->event_thread->control.proceed_to_finish | |
6439 | && execution_direction == EXEC_REVERSE) | |
6440 | { | |
6441 | struct thread_info *tp = ecs->event_thread; | |
6442 | ||
6443 | /* We are finishing a function in reverse, and just hit the | |
6444 | step-resume breakpoint at the start address of the | |
6445 | function, and we're almost there -- just need to back up | |
6446 | by one more single-step, which should take us back to the | |
6447 | function call. */ | |
6448 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6449 | keep_going (ecs); | |
e5ef252a | 6450 | return; |
cdaa5b73 PA |
6451 | } |
6452 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6453 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6454 | && execution_direction == EXEC_REVERSE) |
6455 | { | |
6456 | /* We are stepping over a function call in reverse, and just | |
6457 | hit the step-resume breakpoint at the start address of | |
6458 | the function. Go back to single-stepping, which should | |
6459 | take us back to the function call. */ | |
6460 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6461 | keep_going (ecs); | |
6462 | return; | |
6463 | } | |
6464 | break; | |
e5ef252a | 6465 | |
cdaa5b73 | 6466 | case BPSTAT_WHAT_STOP_NOISY: |
4100594e | 6467 | infrun_log_debug ("BPSTAT_WHAT_STOP_NOISY"); |
cdaa5b73 | 6468 | stop_print_frame = 1; |
e5ef252a | 6469 | |
99619bea PA |
6470 | /* Assume the thread stopped for a breapoint. We'll still check |
6471 | whether a/the breakpoint is there when the thread is next | |
6472 | resumed. */ | |
6473 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6474 | |
22bcd14b | 6475 | stop_waiting (ecs); |
cdaa5b73 | 6476 | return; |
e5ef252a | 6477 | |
cdaa5b73 | 6478 | case BPSTAT_WHAT_STOP_SILENT: |
4100594e | 6479 | infrun_log_debug ("BPSTAT_WHAT_STOP_SILENT"); |
cdaa5b73 | 6480 | stop_print_frame = 0; |
e5ef252a | 6481 | |
99619bea PA |
6482 | /* Assume the thread stopped for a breapoint. We'll still check |
6483 | whether a/the breakpoint is there when the thread is next | |
6484 | resumed. */ | |
6485 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6486 | stop_waiting (ecs); |
cdaa5b73 PA |
6487 | return; |
6488 | ||
6489 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
4100594e | 6490 | infrun_log_debug ("BPSTAT_WHAT_HP_STEP_RESUME"); |
cdaa5b73 PA |
6491 | |
6492 | delete_step_resume_breakpoint (ecs->event_thread); | |
6493 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6494 | { | |
6495 | /* Back when the step-resume breakpoint was inserted, we | |
6496 | were trying to single-step off a breakpoint. Go back to | |
6497 | doing that. */ | |
6498 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6499 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6500 | keep_going (ecs); | |
6501 | return; | |
e5ef252a | 6502 | } |
cdaa5b73 PA |
6503 | break; |
6504 | ||
6505 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6506 | break; | |
e5ef252a | 6507 | } |
c906108c | 6508 | |
af48d08f PA |
6509 | /* If we stepped a permanent breakpoint and we had a high priority |
6510 | step-resume breakpoint for the address we stepped, but we didn't | |
6511 | hit it, then we must have stepped into the signal handler. The | |
6512 | step-resume was only necessary to catch the case of _not_ | |
6513 | stepping into the handler, so delete it, and fall through to | |
6514 | checking whether the step finished. */ | |
6515 | if (ecs->event_thread->stepped_breakpoint) | |
6516 | { | |
6517 | struct breakpoint *sr_bp | |
6518 | = ecs->event_thread->control.step_resume_breakpoint; | |
6519 | ||
8d707a12 PA |
6520 | if (sr_bp != NULL |
6521 | && sr_bp->loc->permanent | |
af48d08f PA |
6522 | && sr_bp->type == bp_hp_step_resume |
6523 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6524 | { | |
4100594e | 6525 | infrun_log_debug ("stepped permanent breakpoint, stopped in handler"); |
af48d08f PA |
6526 | delete_step_resume_breakpoint (ecs->event_thread); |
6527 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6528 | } | |
6529 | } | |
6530 | ||
cdaa5b73 PA |
6531 | /* We come here if we hit a breakpoint but should not stop for it. |
6532 | Possibly we also were stepping and should stop for that. So fall | |
6533 | through and test for stepping. But, if not stepping, do not | |
6534 | stop. */ | |
c906108c | 6535 | |
a7212384 UW |
6536 | /* In all-stop mode, if we're currently stepping but have stopped in |
6537 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6538 | if (switch_back_to_stepped_thread (ecs)) |
6539 | return; | |
776f04fa | 6540 | |
8358c15c | 6541 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6542 | { |
4100594e | 6543 | infrun_log_debug ("step-resume breakpoint is inserted"); |
527159b7 | 6544 | |
488f131b JB |
6545 | /* Having a step-resume breakpoint overrides anything |
6546 | else having to do with stepping commands until | |
6547 | that breakpoint is reached. */ | |
488f131b JB |
6548 | keep_going (ecs); |
6549 | return; | |
6550 | } | |
c5aa993b | 6551 | |
16c381f0 | 6552 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6553 | { |
4100594e | 6554 | infrun_log_debug ("no stepping, continue"); |
488f131b | 6555 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6556 | keep_going (ecs); |
6557 | return; | |
6558 | } | |
c5aa993b | 6559 | |
4b7703ad JB |
6560 | /* Re-fetch current thread's frame in case the code above caused |
6561 | the frame cache to be re-initialized, making our FRAME variable | |
6562 | a dangling pointer. */ | |
6563 | frame = get_current_frame (); | |
628fe4e4 | 6564 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6565 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6566 | |
488f131b | 6567 | /* If stepping through a line, keep going if still within it. |
c906108c | 6568 | |
488f131b JB |
6569 | Note that step_range_end is the address of the first instruction |
6570 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6571 | within it! |
6572 | ||
6573 | Note also that during reverse execution, we may be stepping | |
6574 | through a function epilogue and therefore must detect when | |
6575 | the current-frame changes in the middle of a line. */ | |
6576 | ||
f2ffa92b PA |
6577 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6578 | ecs->event_thread) | |
31410e84 | 6579 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6580 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6581 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6582 | { |
4100594e SM |
6583 | infrun_log_debug |
6584 | ("stepping inside range [%s-%s]", | |
6585 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
6586 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6587 | |
c1e36e3e PA |
6588 | /* Tentatively re-enable range stepping; `resume' disables it if |
6589 | necessary (e.g., if we're stepping over a breakpoint or we | |
6590 | have software watchpoints). */ | |
6591 | ecs->event_thread->control.may_range_step = 1; | |
6592 | ||
b2175913 MS |
6593 | /* When stepping backward, stop at beginning of line range |
6594 | (unless it's the function entry point, in which case | |
6595 | keep going back to the call point). */ | |
f2ffa92b | 6596 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6597 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6598 | && stop_pc != ecs->stop_func_start |
6599 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6600 | end_stepping_range (ecs); |
b2175913 MS |
6601 | else |
6602 | keep_going (ecs); | |
6603 | ||
488f131b JB |
6604 | return; |
6605 | } | |
c5aa993b | 6606 | |
488f131b | 6607 | /* We stepped out of the stepping range. */ |
c906108c | 6608 | |
488f131b | 6609 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6610 | loader dynamic symbol resolution code... |
6611 | ||
6612 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6613 | time loader code and reach the callee's address. | |
6614 | ||
6615 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6616 | the runtime loader code is handled just like any other | |
6617 | undebuggable function call. Now we need only keep stepping | |
6618 | backward through the trampoline code, and that's handled further | |
6619 | down, so there is nothing for us to do here. */ | |
6620 | ||
6621 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6622 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6623 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6624 | { |
4c8c40e6 | 6625 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6626 | gdbarch_skip_solib_resolver (gdbarch, |
6627 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6628 | |
4100594e | 6629 | infrun_log_debug ("stepped into dynsym resolve code"); |
527159b7 | 6630 | |
488f131b JB |
6631 | if (pc_after_resolver) |
6632 | { | |
6633 | /* Set up a step-resume breakpoint at the address | |
6634 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6635 | symtab_and_line sr_sal; |
488f131b | 6636 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6637 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6638 | |
a6d9a66e UW |
6639 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6640 | sr_sal, null_frame_id); | |
c5aa993b | 6641 | } |
c906108c | 6642 | |
488f131b JB |
6643 | keep_going (ecs); |
6644 | return; | |
6645 | } | |
c906108c | 6646 | |
1d509aa6 MM |
6647 | /* Step through an indirect branch thunk. */ |
6648 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6649 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6650 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 | 6651 | { |
4100594e | 6652 | infrun_log_debug ("stepped into indirect branch thunk"); |
1d509aa6 MM |
6653 | keep_going (ecs); |
6654 | return; | |
6655 | } | |
6656 | ||
16c381f0 JK |
6657 | if (ecs->event_thread->control.step_range_end != 1 |
6658 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6659 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6660 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6661 | { |
4100594e | 6662 | infrun_log_debug ("stepped into signal trampoline"); |
42edda50 | 6663 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6664 | a signal trampoline (either by a signal being delivered or by |
6665 | the signal handler returning). Just single-step until the | |
6666 | inferior leaves the trampoline (either by calling the handler | |
6667 | or returning). */ | |
488f131b JB |
6668 | keep_going (ecs); |
6669 | return; | |
6670 | } | |
c906108c | 6671 | |
14132e89 MR |
6672 | /* If we're in the return path from a shared library trampoline, |
6673 | we want to proceed through the trampoline when stepping. */ | |
6674 | /* macro/2012-04-25: This needs to come before the subroutine | |
6675 | call check below as on some targets return trampolines look | |
6676 | like subroutine calls (MIPS16 return thunks). */ | |
6677 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
6678 | ecs->event_thread->suspend.stop_pc, |
6679 | ecs->stop_func_name) | |
14132e89 MR |
6680 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6681 | { | |
6682 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
6683 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6684 | CORE_ADDR real_stop_pc | |
6685 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 | 6686 | |
4100594e | 6687 | infrun_log_debug ("stepped into solib return tramp"); |
14132e89 MR |
6688 | |
6689 | /* Only proceed through if we know where it's going. */ | |
6690 | if (real_stop_pc) | |
6691 | { | |
6692 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6693 | symtab_and_line sr_sal; |
14132e89 MR |
6694 | sr_sal.pc = real_stop_pc; |
6695 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6696 | sr_sal.pspace = get_frame_program_space (frame); | |
6697 | ||
6698 | /* Do not specify what the fp should be when we stop since | |
6699 | on some machines the prologue is where the new fp value | |
6700 | is established. */ | |
6701 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6702 | sr_sal, null_frame_id); | |
6703 | ||
6704 | /* Restart without fiddling with the step ranges or | |
6705 | other state. */ | |
6706 | keep_going (ecs); | |
6707 | return; | |
6708 | } | |
6709 | } | |
6710 | ||
c17eaafe DJ |
6711 | /* Check for subroutine calls. The check for the current frame |
6712 | equalling the step ID is not necessary - the check of the | |
6713 | previous frame's ID is sufficient - but it is a common case and | |
6714 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6715 | |
6716 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6717 | being equal, so to get into this block, both the current and | |
6718 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6719 | /* The outer_frame_id check is a heuristic to detect stepping |
6720 | through startup code. If we step over an instruction which | |
6721 | sets the stack pointer from an invalid value to a valid value, | |
6722 | we may detect that as a subroutine call from the mythical | |
6723 | "outermost" function. This could be fixed by marking | |
6724 | outermost frames as !stack_p,code_p,special_p. Then the | |
6725 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6726 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6727 | for more. */ |
edb3359d | 6728 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6729 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6730 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6731 | ecs->event_thread->control.step_stack_frame_id) |
6732 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6733 | outer_frame_id) |
885eeb5b | 6734 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 6735 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 6736 | { |
f2ffa92b | 6737 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 6738 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6739 | |
4100594e | 6740 | infrun_log_debug ("stepped into subroutine"); |
527159b7 | 6741 | |
b7a084be | 6742 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6743 | { |
6744 | /* I presume that step_over_calls is only 0 when we're | |
6745 | supposed to be stepping at the assembly language level | |
6746 | ("stepi"). Just stop. */ | |
388a8562 | 6747 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6748 | end_stepping_range (ecs); |
95918acb AC |
6749 | return; |
6750 | } | |
8fb3e588 | 6751 | |
388a8562 MS |
6752 | /* Reverse stepping through solib trampolines. */ |
6753 | ||
6754 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6755 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6756 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6757 | || (ecs->stop_func_start == 0 | |
6758 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6759 | { | |
6760 | /* Any solib trampoline code can be handled in reverse | |
6761 | by simply continuing to single-step. We have already | |
6762 | executed the solib function (backwards), and a few | |
6763 | steps will take us back through the trampoline to the | |
6764 | caller. */ | |
6765 | keep_going (ecs); | |
6766 | return; | |
6767 | } | |
6768 | ||
16c381f0 | 6769 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6770 | { |
b2175913 MS |
6771 | /* We're doing a "next". |
6772 | ||
6773 | Normal (forward) execution: set a breakpoint at the | |
6774 | callee's return address (the address at which the caller | |
6775 | will resume). | |
6776 | ||
6777 | Reverse (backward) execution. set the step-resume | |
6778 | breakpoint at the start of the function that we just | |
6779 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6780 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6781 | |
6782 | if (execution_direction == EXEC_REVERSE) | |
6783 | { | |
acf9414f JK |
6784 | /* If we're already at the start of the function, we've either |
6785 | just stepped backward into a single instruction function, | |
6786 | or stepped back out of a signal handler to the first instruction | |
6787 | of the function. Just keep going, which will single-step back | |
6788 | to the caller. */ | |
58c48e72 | 6789 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6790 | { |
acf9414f | 6791 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6792 | symtab_and_line sr_sal; |
acf9414f JK |
6793 | sr_sal.pc = ecs->stop_func_start; |
6794 | sr_sal.pspace = get_frame_program_space (frame); | |
6795 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6796 | sr_sal, null_frame_id); | |
6797 | } | |
b2175913 MS |
6798 | } |
6799 | else | |
568d6575 | 6800 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6801 | |
8567c30f AC |
6802 | keep_going (ecs); |
6803 | return; | |
6804 | } | |
a53c66de | 6805 | |
95918acb | 6806 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6807 | calling routine and the real function), locate the real |
6808 | function. That's what tells us (a) whether we want to step | |
6809 | into it at all, and (b) what prologue we want to run to the | |
6810 | end of, if we do step into it. */ | |
568d6575 | 6811 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6812 | if (real_stop_pc == 0) |
568d6575 | 6813 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6814 | if (real_stop_pc != 0) |
6815 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6816 | |
db5f024e | 6817 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6818 | { |
51abb421 | 6819 | symtab_and_line sr_sal; |
1b2bfbb9 | 6820 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6821 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6822 | |
a6d9a66e UW |
6823 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6824 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6825 | keep_going (ecs); |
6826 | return; | |
1b2bfbb9 RC |
6827 | } |
6828 | ||
95918acb | 6829 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6830 | thinking of stepping into and the function isn't on the skip |
6831 | list, step into it. | |
95918acb | 6832 | |
8fb3e588 AC |
6833 | If there are several symtabs at that PC (e.g. with include |
6834 | files), just want to know whether *any* of them have line | |
6835 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6836 | { |
6837 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6838 | |
95918acb | 6839 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6840 | if (tmp_sal.line != 0 |
85817405 | 6841 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
6842 | tmp_sal) |
6843 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 6844 | { |
b2175913 | 6845 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6846 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6847 | else |
568d6575 | 6848 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6849 | return; |
6850 | } | |
6851 | } | |
6852 | ||
6853 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6854 | set, we stop the step so that the user has a chance to switch |
6855 | in assembly mode. */ | |
16c381f0 | 6856 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6857 | && step_stop_if_no_debug) |
95918acb | 6858 | { |
bdc36728 | 6859 | end_stepping_range (ecs); |
95918acb AC |
6860 | return; |
6861 | } | |
6862 | ||
b2175913 MS |
6863 | if (execution_direction == EXEC_REVERSE) |
6864 | { | |
acf9414f JK |
6865 | /* If we're already at the start of the function, we've either just |
6866 | stepped backward into a single instruction function without line | |
6867 | number info, or stepped back out of a signal handler to the first | |
6868 | instruction of the function without line number info. Just keep | |
6869 | going, which will single-step back to the caller. */ | |
6870 | if (ecs->stop_func_start != stop_pc) | |
6871 | { | |
6872 | /* Set a breakpoint at callee's start address. | |
6873 | From there we can step once and be back in the caller. */ | |
51abb421 | 6874 | symtab_and_line sr_sal; |
acf9414f JK |
6875 | sr_sal.pc = ecs->stop_func_start; |
6876 | sr_sal.pspace = get_frame_program_space (frame); | |
6877 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6878 | sr_sal, null_frame_id); | |
6879 | } | |
b2175913 MS |
6880 | } |
6881 | else | |
6882 | /* Set a breakpoint at callee's return address (the address | |
6883 | at which the caller will resume). */ | |
568d6575 | 6884 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6885 | |
95918acb | 6886 | keep_going (ecs); |
488f131b | 6887 | return; |
488f131b | 6888 | } |
c906108c | 6889 | |
fdd654f3 MS |
6890 | /* Reverse stepping through solib trampolines. */ |
6891 | ||
6892 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6893 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 6894 | { |
f2ffa92b PA |
6895 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6896 | ||
fdd654f3 MS |
6897 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6898 | || (ecs->stop_func_start == 0 | |
6899 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6900 | { | |
6901 | /* Any solib trampoline code can be handled in reverse | |
6902 | by simply continuing to single-step. We have already | |
6903 | executed the solib function (backwards), and a few | |
6904 | steps will take us back through the trampoline to the | |
6905 | caller. */ | |
6906 | keep_going (ecs); | |
6907 | return; | |
6908 | } | |
6909 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6910 | { | |
6911 | /* Stepped backward into the solib dynsym resolver. | |
6912 | Set a breakpoint at its start and continue, then | |
6913 | one more step will take us out. */ | |
51abb421 | 6914 | symtab_and_line sr_sal; |
fdd654f3 | 6915 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 6916 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6917 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6918 | sr_sal, null_frame_id); | |
6919 | keep_going (ecs); | |
6920 | return; | |
6921 | } | |
6922 | } | |
6923 | ||
8c95582d AB |
6924 | /* This always returns the sal for the inner-most frame when we are in a |
6925 | stack of inlined frames, even if GDB actually believes that it is in a | |
6926 | more outer frame. This is checked for below by calls to | |
6927 | inline_skipped_frames. */ | |
f2ffa92b | 6928 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 6929 | |
1b2bfbb9 RC |
6930 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6931 | the trampoline processing logic, however, there are some trampolines | |
6932 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6933 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6934 | && ecs->stop_func_name == NULL |
2afb61aa | 6935 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6936 | { |
4100594e | 6937 | infrun_log_debug ("stepped into undebuggable function"); |
527159b7 | 6938 | |
1b2bfbb9 | 6939 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6940 | undebuggable function (where there is no debugging information |
6941 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6942 | inferior stopped). Since we want to skip this kind of code, |
6943 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6944 | function - unless the user has asked us not to (via |
6945 | set step-mode) or we no longer know how to get back | |
6946 | to the call site. */ | |
6947 | if (step_stop_if_no_debug | |
c7ce8faa | 6948 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6949 | { |
6950 | /* If we have no line number and the step-stop-if-no-debug | |
6951 | is set, we stop the step so that the user has a chance to | |
6952 | switch in assembly mode. */ | |
bdc36728 | 6953 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6954 | return; |
6955 | } | |
6956 | else | |
6957 | { | |
6958 | /* Set a breakpoint at callee's return address (the address | |
6959 | at which the caller will resume). */ | |
568d6575 | 6960 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6961 | keep_going (ecs); |
6962 | return; | |
6963 | } | |
6964 | } | |
6965 | ||
16c381f0 | 6966 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6967 | { |
6968 | /* It is stepi or nexti. We always want to stop stepping after | |
6969 | one instruction. */ | |
4100594e | 6970 | infrun_log_debug ("stepi/nexti"); |
bdc36728 | 6971 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6972 | return; |
6973 | } | |
6974 | ||
2afb61aa | 6975 | if (stop_pc_sal.line == 0) |
488f131b JB |
6976 | { |
6977 | /* We have no line number information. That means to stop | |
6978 | stepping (does this always happen right after one instruction, | |
6979 | when we do "s" in a function with no line numbers, | |
6980 | or can this happen as a result of a return or longjmp?). */ | |
4100594e | 6981 | infrun_log_debug ("line number info"); |
bdc36728 | 6982 | end_stepping_range (ecs); |
488f131b JB |
6983 | return; |
6984 | } | |
c906108c | 6985 | |
edb3359d DJ |
6986 | /* Look for "calls" to inlined functions, part one. If the inline |
6987 | frame machinery detected some skipped call sites, we have entered | |
6988 | a new inline function. */ | |
6989 | ||
6990 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6991 | ecs->event_thread->control.step_frame_id) |
00431a78 | 6992 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 6993 | { |
4100594e | 6994 | infrun_log_debug ("stepped into inlined function"); |
edb3359d | 6995 | |
51abb421 | 6996 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 6997 | |
16c381f0 | 6998 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
6999 | { |
7000 | /* For "step", we're going to stop. But if the call site | |
7001 | for this inlined function is on the same source line as | |
7002 | we were previously stepping, go down into the function | |
7003 | first. Otherwise stop at the call site. */ | |
7004 | ||
7005 | if (call_sal.line == ecs->event_thread->current_line | |
7006 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7007 | { |
7008 | step_into_inline_frame (ecs->event_thread); | |
7009 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7010 | { | |
7011 | keep_going (ecs); | |
7012 | return; | |
7013 | } | |
7014 | } | |
edb3359d | 7015 | |
bdc36728 | 7016 | end_stepping_range (ecs); |
edb3359d DJ |
7017 | return; |
7018 | } | |
7019 | else | |
7020 | { | |
7021 | /* For "next", we should stop at the call site if it is on a | |
7022 | different source line. Otherwise continue through the | |
7023 | inlined function. */ | |
7024 | if (call_sal.line == ecs->event_thread->current_line | |
7025 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7026 | keep_going (ecs); | |
7027 | else | |
bdc36728 | 7028 | end_stepping_range (ecs); |
edb3359d DJ |
7029 | return; |
7030 | } | |
7031 | } | |
7032 | ||
7033 | /* Look for "calls" to inlined functions, part two. If we are still | |
7034 | in the same real function we were stepping through, but we have | |
7035 | to go further up to find the exact frame ID, we are stepping | |
7036 | through a more inlined call beyond its call site. */ | |
7037 | ||
7038 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
7039 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7040 | ecs->event_thread->control.step_frame_id) |
edb3359d | 7041 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7042 | ecs->event_thread->control.step_frame_id)) |
edb3359d | 7043 | { |
4100594e | 7044 | infrun_log_debug ("stepping through inlined function"); |
edb3359d | 7045 | |
4a4c04f1 BE |
7046 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7047 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7048 | keep_going (ecs); |
7049 | else | |
bdc36728 | 7050 | end_stepping_range (ecs); |
edb3359d DJ |
7051 | return; |
7052 | } | |
7053 | ||
8c95582d | 7054 | bool refresh_step_info = true; |
f2ffa92b | 7055 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
7056 | && (ecs->event_thread->current_line != stop_pc_sal.line |
7057 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b | 7058 | { |
8c95582d AB |
7059 | if (stop_pc_sal.is_stmt) |
7060 | { | |
7061 | /* We are at the start of a different line. So stop. Note that | |
7062 | we don't stop if we step into the middle of a different line. | |
7063 | That is said to make things like for (;;) statements work | |
7064 | better. */ | |
4100594e | 7065 | infrun_log_debug ("infrun: stepped to a different line\n"); |
8c95582d AB |
7066 | end_stepping_range (ecs); |
7067 | return; | |
7068 | } | |
7069 | else if (frame_id_eq (get_frame_id (get_current_frame ()), | |
7070 | ecs->event_thread->control.step_frame_id)) | |
7071 | { | |
7072 | /* We are at the start of a different line, however, this line is | |
7073 | not marked as a statement, and we have not changed frame. We | |
7074 | ignore this line table entry, and continue stepping forward, | |
7075 | looking for a better place to stop. */ | |
7076 | refresh_step_info = false; | |
4100594e SM |
7077 | infrun_log_debug ("infrun: stepped to a different line, but " |
7078 | "it's not the start of a statement\n"); | |
8c95582d | 7079 | } |
488f131b | 7080 | } |
c906108c | 7081 | |
488f131b | 7082 | /* We aren't done stepping. |
c906108c | 7083 | |
488f131b JB |
7084 | Optimize by setting the stepping range to the line. |
7085 | (We might not be in the original line, but if we entered a | |
7086 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7087 | things like for(;;) statements work better.) |
7088 | ||
7089 | If we entered a SAL that indicates a non-statement line table entry, | |
7090 | then we update the stepping range, but we don't update the step info, | |
7091 | which includes things like the line number we are stepping away from. | |
7092 | This means we will stop when we find a line table entry that is marked | |
7093 | as is-statement, even if it matches the non-statement one we just | |
7094 | stepped into. */ | |
c906108c | 7095 | |
16c381f0 JK |
7096 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7097 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7098 | ecs->event_thread->control.may_range_step = 1; |
8c95582d AB |
7099 | if (refresh_step_info) |
7100 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7101 | |
4100594e | 7102 | infrun_log_debug ("keep going"); |
488f131b | 7103 | keep_going (ecs); |
104c1213 JM |
7104 | } |
7105 | ||
c447ac0b PA |
7106 | /* In all-stop mode, if we're currently stepping but have stopped in |
7107 | some other thread, we may need to switch back to the stepped | |
7108 | thread. Returns true we set the inferior running, false if we left | |
7109 | it stopped (and the event needs further processing). */ | |
7110 | ||
7111 | static int | |
7112 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
7113 | { | |
fbea99ea | 7114 | if (!target_is_non_stop_p ()) |
c447ac0b | 7115 | { |
99619bea PA |
7116 | struct thread_info *stepping_thread; |
7117 | ||
7118 | /* If any thread is blocked on some internal breakpoint, and we | |
7119 | simply need to step over that breakpoint to get it going | |
7120 | again, do that first. */ | |
7121 | ||
7122 | /* However, if we see an event for the stepping thread, then we | |
7123 | know all other threads have been moved past their breakpoints | |
7124 | already. Let the caller check whether the step is finished, | |
7125 | etc., before deciding to move it past a breakpoint. */ | |
7126 | if (ecs->event_thread->control.step_range_end != 0) | |
7127 | return 0; | |
7128 | ||
7129 | /* Check if the current thread is blocked on an incomplete | |
7130 | step-over, interrupted by a random signal. */ | |
7131 | if (ecs->event_thread->control.trap_expected | |
7132 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7133 | { |
4100594e SM |
7134 | infrun_log_debug ("need to finish step-over of [%s]", |
7135 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
99619bea PA |
7136 | keep_going (ecs); |
7137 | return 1; | |
7138 | } | |
2adfaa28 | 7139 | |
99619bea PA |
7140 | /* Check if the current thread is blocked by a single-step |
7141 | breakpoint of another thread. */ | |
7142 | if (ecs->hit_singlestep_breakpoint) | |
7143 | { | |
4100594e SM |
7144 | infrun_log_debug ("need to step [%s] over single-step breakpoint", |
7145 | target_pid_to_str (ecs->ptid).c_str ()); | |
99619bea PA |
7146 | keep_going (ecs); |
7147 | return 1; | |
7148 | } | |
7149 | ||
4d9d9d04 PA |
7150 | /* If this thread needs yet another step-over (e.g., stepping |
7151 | through a delay slot), do it first before moving on to | |
7152 | another thread. */ | |
7153 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7154 | { | |
4100594e SM |
7155 | infrun_log_debug |
7156 | ("thread [%s] still needs step-over", | |
7157 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
4d9d9d04 PA |
7158 | keep_going (ecs); |
7159 | return 1; | |
7160 | } | |
70509625 | 7161 | |
483805cf PA |
7162 | /* If scheduler locking applies even if not stepping, there's no |
7163 | need to walk over threads. Above we've checked whether the | |
7164 | current thread is stepping. If some other thread not the | |
7165 | event thread is stepping, then it must be that scheduler | |
7166 | locking is not in effect. */ | |
856e7dd6 | 7167 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
7168 | return 0; |
7169 | ||
4d9d9d04 PA |
7170 | /* Otherwise, we no longer expect a trap in the current thread. |
7171 | Clear the trap_expected flag before switching back -- this is | |
7172 | what keep_going does as well, if we call it. */ | |
7173 | ecs->event_thread->control.trap_expected = 0; | |
7174 | ||
7175 | /* Likewise, clear the signal if it should not be passed. */ | |
7176 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7177 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7178 | ||
7179 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 7180 | step/next/etc. */ |
4d9d9d04 PA |
7181 | if (start_step_over ()) |
7182 | { | |
7183 | prepare_to_wait (ecs); | |
7184 | return 1; | |
7185 | } | |
7186 | ||
7187 | /* Look for the stepping/nexting thread. */ | |
483805cf | 7188 | stepping_thread = NULL; |
4d9d9d04 | 7189 | |
08036331 | 7190 | for (thread_info *tp : all_non_exited_threads ()) |
483805cf | 7191 | { |
f3f8ece4 PA |
7192 | switch_to_thread_no_regs (tp); |
7193 | ||
fbea99ea PA |
7194 | /* Ignore threads of processes the caller is not |
7195 | resuming. */ | |
483805cf | 7196 | if (!sched_multi |
5b6d1e4f PA |
7197 | && (tp->inf->process_target () != ecs->target |
7198 | || tp->inf->pid != ecs->ptid.pid ())) | |
483805cf PA |
7199 | continue; |
7200 | ||
7201 | /* When stepping over a breakpoint, we lock all threads | |
7202 | except the one that needs to move past the breakpoint. | |
7203 | If a non-event thread has this set, the "incomplete | |
7204 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
7205 | if (tp->control.trap_expected) |
7206 | { | |
7207 | internal_error (__FILE__, __LINE__, | |
7208 | "[%s] has inconsistent state: " | |
7209 | "trap_expected=%d\n", | |
a068643d | 7210 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
7211 | tp->control.trap_expected); |
7212 | } | |
483805cf PA |
7213 | |
7214 | /* Did we find the stepping thread? */ | |
7215 | if (tp->control.step_range_end) | |
7216 | { | |
7217 | /* Yep. There should only one though. */ | |
7218 | gdb_assert (stepping_thread == NULL); | |
7219 | ||
7220 | /* The event thread is handled at the top, before we | |
7221 | enter this loop. */ | |
7222 | gdb_assert (tp != ecs->event_thread); | |
7223 | ||
7224 | /* If some thread other than the event thread is | |
7225 | stepping, then scheduler locking can't be in effect, | |
7226 | otherwise we wouldn't have resumed the current event | |
7227 | thread in the first place. */ | |
856e7dd6 | 7228 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
7229 | |
7230 | stepping_thread = tp; | |
7231 | } | |
99619bea PA |
7232 | } |
7233 | ||
483805cf | 7234 | if (stepping_thread != NULL) |
99619bea | 7235 | { |
4100594e | 7236 | infrun_log_debug ("switching back to stepped thread"); |
c447ac0b | 7237 | |
2ac7589c PA |
7238 | if (keep_going_stepped_thread (stepping_thread)) |
7239 | { | |
7240 | prepare_to_wait (ecs); | |
7241 | return 1; | |
7242 | } | |
7243 | } | |
f3f8ece4 PA |
7244 | |
7245 | switch_to_thread (ecs->event_thread); | |
2ac7589c | 7246 | } |
2adfaa28 | 7247 | |
2ac7589c PA |
7248 | return 0; |
7249 | } | |
2adfaa28 | 7250 | |
2ac7589c PA |
7251 | /* Set a previously stepped thread back to stepping. Returns true on |
7252 | success, false if the resume is not possible (e.g., the thread | |
7253 | vanished). */ | |
7254 | ||
7255 | static int | |
7256 | keep_going_stepped_thread (struct thread_info *tp) | |
7257 | { | |
7258 | struct frame_info *frame; | |
2ac7589c PA |
7259 | struct execution_control_state ecss; |
7260 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7261 | |
2ac7589c PA |
7262 | /* If the stepping thread exited, then don't try to switch back and |
7263 | resume it, which could fail in several different ways depending | |
7264 | on the target. Instead, just keep going. | |
2adfaa28 | 7265 | |
2ac7589c PA |
7266 | We can find a stepping dead thread in the thread list in two |
7267 | cases: | |
2adfaa28 | 7268 | |
2ac7589c PA |
7269 | - The target supports thread exit events, and when the target |
7270 | tries to delete the thread from the thread list, inferior_ptid | |
7271 | pointed at the exiting thread. In such case, calling | |
7272 | delete_thread does not really remove the thread from the list; | |
7273 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7274 | |
2ac7589c PA |
7275 | - The target's debug interface does not support thread exit |
7276 | events, and so we have no idea whatsoever if the previously | |
7277 | stepping thread is still alive. For that reason, we need to | |
7278 | synchronously query the target now. */ | |
2adfaa28 | 7279 | |
00431a78 | 7280 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c | 7281 | { |
4100594e SM |
7282 | infrun_log_debug ("not resuming previously stepped thread, it has " |
7283 | "vanished"); | |
2ac7589c | 7284 | |
00431a78 | 7285 | delete_thread (tp); |
2ac7589c | 7286 | return 0; |
c447ac0b | 7287 | } |
2ac7589c | 7288 | |
4100594e | 7289 | infrun_log_debug ("resuming previously stepped thread"); |
2ac7589c PA |
7290 | |
7291 | reset_ecs (ecs, tp); | |
00431a78 | 7292 | switch_to_thread (tp); |
2ac7589c | 7293 | |
f2ffa92b | 7294 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 7295 | frame = get_current_frame (); |
2ac7589c PA |
7296 | |
7297 | /* If the PC of the thread we were trying to single-step has | |
7298 | changed, then that thread has trapped or been signaled, but the | |
7299 | event has not been reported to GDB yet. Re-poll the target | |
7300 | looking for this particular thread's event (i.e. temporarily | |
7301 | enable schedlock) by: | |
7302 | ||
7303 | - setting a break at the current PC | |
7304 | - resuming that particular thread, only (by setting trap | |
7305 | expected) | |
7306 | ||
7307 | This prevents us continuously moving the single-step breakpoint | |
7308 | forward, one instruction at a time, overstepping. */ | |
7309 | ||
f2ffa92b | 7310 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
7311 | { |
7312 | ptid_t resume_ptid; | |
7313 | ||
4100594e SM |
7314 | infrun_log_debug ("expected thread advanced also (%s -> %s)", |
7315 | paddress (target_gdbarch (), tp->prev_pc), | |
7316 | paddress (target_gdbarch (), tp->suspend.stop_pc)); | |
2ac7589c PA |
7317 | |
7318 | /* Clear the info of the previous step-over, as it's no longer | |
7319 | valid (if the thread was trying to step over a breakpoint, it | |
7320 | has already succeeded). It's what keep_going would do too, | |
7321 | if we called it. Do this before trying to insert the sss | |
7322 | breakpoint, otherwise if we were previously trying to step | |
7323 | over this exact address in another thread, the breakpoint is | |
7324 | skipped. */ | |
7325 | clear_step_over_info (); | |
7326 | tp->control.trap_expected = 0; | |
7327 | ||
7328 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7329 | get_frame_address_space (frame), | |
f2ffa92b | 7330 | tp->suspend.stop_pc); |
2ac7589c | 7331 | |
719546c4 | 7332 | tp->resumed = true; |
fbea99ea | 7333 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7334 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7335 | } | |
7336 | else | |
7337 | { | |
4100594e | 7338 | infrun_log_debug ("expected thread still hasn't advanced"); |
2ac7589c PA |
7339 | |
7340 | keep_going_pass_signal (ecs); | |
7341 | } | |
7342 | return 1; | |
c447ac0b PA |
7343 | } |
7344 | ||
8b061563 PA |
7345 | /* Is thread TP in the middle of (software or hardware) |
7346 | single-stepping? (Note the result of this function must never be | |
7347 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7348 | |
a289b8f6 | 7349 | static int |
b3444185 | 7350 | currently_stepping (struct thread_info *tp) |
a7212384 | 7351 | { |
8358c15c JK |
7352 | return ((tp->control.step_range_end |
7353 | && tp->control.step_resume_breakpoint == NULL) | |
7354 | || tp->control.trap_expected | |
af48d08f | 7355 | || tp->stepped_breakpoint |
8358c15c | 7356 | || bpstat_should_step ()); |
a7212384 UW |
7357 | } |
7358 | ||
b2175913 MS |
7359 | /* Inferior has stepped into a subroutine call with source code that |
7360 | we should not step over. Do step to the first line of code in | |
7361 | it. */ | |
c2c6d25f JM |
7362 | |
7363 | static void | |
568d6575 UW |
7364 | handle_step_into_function (struct gdbarch *gdbarch, |
7365 | struct execution_control_state *ecs) | |
c2c6d25f | 7366 | { |
7e324e48 GB |
7367 | fill_in_stop_func (gdbarch, ecs); |
7368 | ||
f2ffa92b PA |
7369 | compunit_symtab *cust |
7370 | = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); | |
43f3e411 | 7371 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7372 | ecs->stop_func_start |
7373 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7374 | |
51abb421 | 7375 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7376 | /* Use the step_resume_break to step until the end of the prologue, |
7377 | even if that involves jumps (as it seems to on the vax under | |
7378 | 4.2). */ | |
7379 | /* If the prologue ends in the middle of a source line, continue to | |
7380 | the end of that source line (if it is still within the function). | |
7381 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7382 | if (stop_func_sal.end |
7383 | && stop_func_sal.pc != ecs->stop_func_start | |
7384 | && stop_func_sal.end < ecs->stop_func_end) | |
7385 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7386 | |
2dbd5e30 KB |
7387 | /* Architectures which require breakpoint adjustment might not be able |
7388 | to place a breakpoint at the computed address. If so, the test | |
7389 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7390 | ecs->stop_func_start to an address at which a breakpoint may be | |
7391 | legitimately placed. | |
8fb3e588 | 7392 | |
2dbd5e30 KB |
7393 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7394 | made, GDB will enter an infinite loop when stepping through | |
7395 | optimized code consisting of VLIW instructions which contain | |
7396 | subinstructions corresponding to different source lines. On | |
7397 | FR-V, it's not permitted to place a breakpoint on any but the | |
7398 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7399 | set, GDB will adjust the breakpoint address to the beginning of | |
7400 | the VLIW instruction. Thus, we need to make the corresponding | |
7401 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7402 | |
568d6575 | 7403 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7404 | { |
7405 | ecs->stop_func_start | |
568d6575 | 7406 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7407 | ecs->stop_func_start); |
2dbd5e30 KB |
7408 | } |
7409 | ||
f2ffa92b | 7410 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7411 | { |
7412 | /* We are already there: stop now. */ | |
bdc36728 | 7413 | end_stepping_range (ecs); |
c2c6d25f JM |
7414 | return; |
7415 | } | |
7416 | else | |
7417 | { | |
7418 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7419 | symtab_and_line sr_sal; |
c2c6d25f JM |
7420 | sr_sal.pc = ecs->stop_func_start; |
7421 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7422 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7423 | |
c2c6d25f | 7424 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7425 | some machines the prologue is where the new fp value is |
7426 | established. */ | |
a6d9a66e | 7427 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7428 | |
7429 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7430 | ecs->event_thread->control.step_range_end |
7431 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7432 | } |
7433 | keep_going (ecs); | |
7434 | } | |
d4f3574e | 7435 | |
b2175913 MS |
7436 | /* Inferior has stepped backward into a subroutine call with source |
7437 | code that we should not step over. Do step to the beginning of the | |
7438 | last line of code in it. */ | |
7439 | ||
7440 | static void | |
568d6575 UW |
7441 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7442 | struct execution_control_state *ecs) | |
b2175913 | 7443 | { |
43f3e411 | 7444 | struct compunit_symtab *cust; |
167e4384 | 7445 | struct symtab_and_line stop_func_sal; |
b2175913 | 7446 | |
7e324e48 GB |
7447 | fill_in_stop_func (gdbarch, ecs); |
7448 | ||
f2ffa92b | 7449 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7450 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7451 | ecs->stop_func_start |
7452 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7453 | |
f2ffa92b | 7454 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7455 | |
7456 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7457 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7458 | { |
7459 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7460 | end_stepping_range (ecs); |
b2175913 MS |
7461 | } |
7462 | else | |
7463 | { | |
7464 | /* Else just reset the step range and keep going. | |
7465 | No step-resume breakpoint, they don't work for | |
7466 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7467 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7468 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7469 | keep_going (ecs); |
7470 | } | |
7471 | return; | |
7472 | } | |
7473 | ||
d3169d93 | 7474 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7475 | This is used to both functions and to skip over code. */ |
7476 | ||
7477 | static void | |
2c03e5be PA |
7478 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7479 | struct symtab_and_line sr_sal, | |
7480 | struct frame_id sr_id, | |
7481 | enum bptype sr_type) | |
44cbf7b5 | 7482 | { |
611c83ae PA |
7483 | /* There should never be more than one step-resume or longjmp-resume |
7484 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7485 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7486 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7487 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 | 7488 | |
4100594e SM |
7489 | infrun_log_debug ("inserting step-resume breakpoint at %s", |
7490 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7491 | |
8358c15c | 7492 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7493 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7494 | } |
7495 | ||
9da8c2a0 | 7496 | void |
2c03e5be PA |
7497 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7498 | struct symtab_and_line sr_sal, | |
7499 | struct frame_id sr_id) | |
7500 | { | |
7501 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7502 | sr_sal, sr_id, | |
7503 | bp_step_resume); | |
44cbf7b5 | 7504 | } |
7ce450bd | 7505 | |
2c03e5be PA |
7506 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7507 | This is used to skip a potential signal handler. | |
7ce450bd | 7508 | |
14e60db5 DJ |
7509 | This is called with the interrupted function's frame. The signal |
7510 | handler, when it returns, will resume the interrupted function at | |
7511 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7512 | |
7513 | static void | |
2c03e5be | 7514 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7515 | { |
f4c1edd8 | 7516 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7517 | |
51abb421 PA |
7518 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7519 | ||
7520 | symtab_and_line sr_sal; | |
568d6575 | 7521 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7522 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7523 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7524 | |
2c03e5be PA |
7525 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7526 | get_stack_frame_id (return_frame), | |
7527 | bp_hp_step_resume); | |
d303a6c7 AC |
7528 | } |
7529 | ||
2c03e5be PA |
7530 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7531 | is used to skip a function after stepping into it (for "next" or if | |
7532 | the called function has no debugging information). | |
14e60db5 DJ |
7533 | |
7534 | The current function has almost always been reached by single | |
7535 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7536 | current function, and the breakpoint will be set at the caller's | |
7537 | resume address. | |
7538 | ||
7539 | This is a separate function rather than reusing | |
2c03e5be | 7540 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7541 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7542 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7543 | |
7544 | static void | |
7545 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7546 | { | |
14e60db5 DJ |
7547 | /* We shouldn't have gotten here if we don't know where the call site |
7548 | is. */ | |
c7ce8faa | 7549 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7550 | |
51abb421 | 7551 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7552 | |
51abb421 | 7553 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7554 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7555 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7556 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7557 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7558 | |
a6d9a66e | 7559 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7560 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7561 | } |
7562 | ||
611c83ae PA |
7563 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7564 | new breakpoint at the target of a jmp_buf. The handling of | |
7565 | longjmp-resume uses the same mechanisms used for handling | |
7566 | "step-resume" breakpoints. */ | |
7567 | ||
7568 | static void | |
a6d9a66e | 7569 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7570 | { |
e81a37f7 TT |
7571 | /* There should never be more than one longjmp-resume breakpoint per |
7572 | thread, so we should never be setting a new | |
611c83ae | 7573 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7574 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae | 7575 | |
4100594e SM |
7576 | infrun_log_debug ("inserting longjmp-resume breakpoint at %s", |
7577 | paddress (gdbarch, pc)); | |
611c83ae | 7578 | |
e81a37f7 | 7579 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7580 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7581 | } |
7582 | ||
186c406b TT |
7583 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7584 | the exception. The block B is the block of the unwinder debug hook | |
7585 | function. FRAME is the frame corresponding to the call to this | |
7586 | function. SYM is the symbol of the function argument holding the | |
7587 | target PC of the exception. */ | |
7588 | ||
7589 | static void | |
7590 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7591 | const struct block *b, |
186c406b TT |
7592 | struct frame_info *frame, |
7593 | struct symbol *sym) | |
7594 | { | |
a70b8144 | 7595 | try |
186c406b | 7596 | { |
63e43d3a | 7597 | struct block_symbol vsym; |
186c406b TT |
7598 | struct value *value; |
7599 | CORE_ADDR handler; | |
7600 | struct breakpoint *bp; | |
7601 | ||
987012b8 | 7602 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 7603 | b, VAR_DOMAIN); |
63e43d3a | 7604 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7605 | /* If the value was optimized out, revert to the old behavior. */ |
7606 | if (! value_optimized_out (value)) | |
7607 | { | |
7608 | handler = value_as_address (value); | |
7609 | ||
4100594e SM |
7610 | infrun_log_debug ("exception resume at %lx", |
7611 | (unsigned long) handler); | |
186c406b TT |
7612 | |
7613 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7614 | handler, |
7615 | bp_exception_resume).release (); | |
c70a6932 JK |
7616 | |
7617 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7618 | frame = NULL; | |
7619 | ||
5d5658a1 | 7620 | bp->thread = tp->global_num; |
186c406b TT |
7621 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7622 | } | |
7623 | } | |
230d2906 | 7624 | catch (const gdb_exception_error &e) |
492d29ea PA |
7625 | { |
7626 | /* We want to ignore errors here. */ | |
7627 | } | |
186c406b TT |
7628 | } |
7629 | ||
28106bc2 SDJ |
7630 | /* A helper for check_exception_resume that sets an |
7631 | exception-breakpoint based on a SystemTap probe. */ | |
7632 | ||
7633 | static void | |
7634 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7635 | const struct bound_probe *probe, |
28106bc2 SDJ |
7636 | struct frame_info *frame) |
7637 | { | |
7638 | struct value *arg_value; | |
7639 | CORE_ADDR handler; | |
7640 | struct breakpoint *bp; | |
7641 | ||
7642 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7643 | if (!arg_value) | |
7644 | return; | |
7645 | ||
7646 | handler = value_as_address (arg_value); | |
7647 | ||
4100594e SM |
7648 | infrun_log_debug ("exception resume at %s", |
7649 | paddress (probe->objfile->arch (), handler)); | |
28106bc2 SDJ |
7650 | |
7651 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7652 | handler, bp_exception_resume).release (); |
5d5658a1 | 7653 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7654 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7655 | } | |
7656 | ||
186c406b TT |
7657 | /* This is called when an exception has been intercepted. Check to |
7658 | see whether the exception's destination is of interest, and if so, | |
7659 | set an exception resume breakpoint there. */ | |
7660 | ||
7661 | static void | |
7662 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7663 | struct frame_info *frame) |
186c406b | 7664 | { |
729662a5 | 7665 | struct bound_probe probe; |
28106bc2 SDJ |
7666 | struct symbol *func; |
7667 | ||
7668 | /* First see if this exception unwinding breakpoint was set via a | |
7669 | SystemTap probe point. If so, the probe has two arguments: the | |
7670 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7671 | set a breakpoint there. */ | |
6bac7473 | 7672 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7673 | if (probe.prob) |
28106bc2 | 7674 | { |
729662a5 | 7675 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7676 | return; |
7677 | } | |
7678 | ||
7679 | func = get_frame_function (frame); | |
7680 | if (!func) | |
7681 | return; | |
186c406b | 7682 | |
a70b8144 | 7683 | try |
186c406b | 7684 | { |
3977b71f | 7685 | const struct block *b; |
8157b174 | 7686 | struct block_iterator iter; |
186c406b TT |
7687 | struct symbol *sym; |
7688 | int argno = 0; | |
7689 | ||
7690 | /* The exception breakpoint is a thread-specific breakpoint on | |
7691 | the unwinder's debug hook, declared as: | |
7692 | ||
7693 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7694 | ||
7695 | The CFA argument indicates the frame to which control is | |
7696 | about to be transferred. HANDLER is the destination PC. | |
7697 | ||
7698 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7699 | This is not extremely efficient but it avoids issues in gdb | |
7700 | with computing the DWARF CFA, and it also works even in weird | |
7701 | cases such as throwing an exception from inside a signal | |
7702 | handler. */ | |
7703 | ||
7704 | b = SYMBOL_BLOCK_VALUE (func); | |
7705 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7706 | { | |
7707 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7708 | continue; | |
7709 | ||
7710 | if (argno == 0) | |
7711 | ++argno; | |
7712 | else | |
7713 | { | |
7714 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7715 | b, frame, sym); | |
7716 | break; | |
7717 | } | |
7718 | } | |
7719 | } | |
230d2906 | 7720 | catch (const gdb_exception_error &e) |
492d29ea PA |
7721 | { |
7722 | } | |
186c406b TT |
7723 | } |
7724 | ||
104c1213 | 7725 | static void |
22bcd14b | 7726 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7727 | { |
4100594e | 7728 | infrun_log_debug ("stop_waiting"); |
527159b7 | 7729 | |
cd0fc7c3 SS |
7730 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7731 | ecs->wait_some_more = 0; | |
fbea99ea | 7732 | |
53cccef1 | 7733 | /* If all-stop, but there exists a non-stop target, stop all |
fbea99ea | 7734 | threads now that we're presenting the stop to the user. */ |
53cccef1 | 7735 | if (!non_stop && exists_non_stop_target ()) |
fbea99ea | 7736 | stop_all_threads (); |
cd0fc7c3 SS |
7737 | } |
7738 | ||
4d9d9d04 PA |
7739 | /* Like keep_going, but passes the signal to the inferior, even if the |
7740 | signal is set to nopass. */ | |
d4f3574e SS |
7741 | |
7742 | static void | |
4d9d9d04 | 7743 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7744 | { |
d7e15655 | 7745 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 7746 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7747 | |
d4f3574e | 7748 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 7749 | ecs->event_thread->prev_pc |
fc75c28b | 7750 | = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 7751 | |
4d9d9d04 | 7752 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7753 | { |
4d9d9d04 PA |
7754 | struct thread_info *tp = ecs->event_thread; |
7755 | ||
4100594e SM |
7756 | infrun_log_debug ("%s has trap_expected set, " |
7757 | "resuming to collect trap", | |
7758 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 | 7759 | |
a9ba6bae PA |
7760 | /* We haven't yet gotten our trap, and either: intercepted a |
7761 | non-signal event (e.g., a fork); or took a signal which we | |
7762 | are supposed to pass through to the inferior. Simply | |
7763 | continue. */ | |
64ce06e4 | 7764 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7765 | } |
372316f1 PA |
7766 | else if (step_over_info_valid_p ()) |
7767 | { | |
7768 | /* Another thread is stepping over a breakpoint in-line. If | |
7769 | this thread needs a step-over too, queue the request. In | |
7770 | either case, this resume must be deferred for later. */ | |
7771 | struct thread_info *tp = ecs->event_thread; | |
7772 | ||
7773 | if (ecs->hit_singlestep_breakpoint | |
7774 | || thread_still_needs_step_over (tp)) | |
7775 | { | |
4100594e SM |
7776 | infrun_log_debug ("step-over already in progress: " |
7777 | "step-over for %s deferred", | |
7778 | target_pid_to_str (tp->ptid).c_str ()); | |
bb88694d | 7779 | global_thread_step_over_chain_enqueue (tp); |
372316f1 PA |
7780 | } |
7781 | else | |
7782 | { | |
4100594e SM |
7783 | infrun_log_debug ("step-over in progress: resume of %s deferred", |
7784 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 7785 | } |
372316f1 | 7786 | } |
d4f3574e SS |
7787 | else |
7788 | { | |
31e77af2 | 7789 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7790 | int remove_bp; |
7791 | int remove_wps; | |
8d297bbf | 7792 | step_over_what step_what; |
31e77af2 | 7793 | |
d4f3574e | 7794 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7795 | anyway (if we got a signal, the user asked it be passed to |
7796 | the child) | |
7797 | -- or -- | |
7798 | We got our expected trap, but decided we should resume from | |
7799 | it. | |
d4f3574e | 7800 | |
a9ba6bae | 7801 | We're going to run this baby now! |
d4f3574e | 7802 | |
c36b740a VP |
7803 | Note that insert_breakpoints won't try to re-insert |
7804 | already inserted breakpoints. Therefore, we don't | |
7805 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7806 | |
31e77af2 PA |
7807 | /* If we need to step over a breakpoint, and we're not using |
7808 | displaced stepping to do so, insert all breakpoints | |
7809 | (watchpoints, etc.) but the one we're stepping over, step one | |
7810 | instruction, and then re-insert the breakpoint when that step | |
7811 | is finished. */ | |
963f9c80 | 7812 | |
6c4cfb24 PA |
7813 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7814 | ||
963f9c80 | 7815 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7816 | || (step_what & STEP_OVER_BREAKPOINT)); |
7817 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7818 | |
cb71640d PA |
7819 | /* We can't use displaced stepping if we need to step past a |
7820 | watchpoint. The instruction copied to the scratch pad would | |
7821 | still trigger the watchpoint. */ | |
7822 | if (remove_bp | |
3fc8eb30 | 7823 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7824 | { |
a01bda52 | 7825 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
7826 | regcache_read_pc (regcache), remove_wps, |
7827 | ecs->event_thread->global_num); | |
45e8c884 | 7828 | } |
963f9c80 | 7829 | else if (remove_wps) |
21edc42f | 7830 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
7831 | |
7832 | /* If we now need to do an in-line step-over, we need to stop | |
7833 | all other threads. Note this must be done before | |
7834 | insert_breakpoints below, because that removes the breakpoint | |
7835 | we're about to step over, otherwise other threads could miss | |
7836 | it. */ | |
fbea99ea | 7837 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7838 | stop_all_threads (); |
abbb1732 | 7839 | |
31e77af2 | 7840 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 7841 | try |
31e77af2 PA |
7842 | { |
7843 | insert_breakpoints (); | |
7844 | } | |
230d2906 | 7845 | catch (const gdb_exception_error &e) |
31e77af2 PA |
7846 | { |
7847 | exception_print (gdb_stderr, e); | |
22bcd14b | 7848 | stop_waiting (ecs); |
bdf2a94a | 7849 | clear_step_over_info (); |
31e77af2 | 7850 | return; |
d4f3574e SS |
7851 | } |
7852 | ||
963f9c80 | 7853 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7854 | |
64ce06e4 | 7855 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7856 | } |
7857 | ||
488f131b | 7858 | prepare_to_wait (ecs); |
d4f3574e SS |
7859 | } |
7860 | ||
4d9d9d04 PA |
7861 | /* Called when we should continue running the inferior, because the |
7862 | current event doesn't cause a user visible stop. This does the | |
7863 | resuming part; waiting for the next event is done elsewhere. */ | |
7864 | ||
7865 | static void | |
7866 | keep_going (struct execution_control_state *ecs) | |
7867 | { | |
7868 | if (ecs->event_thread->control.trap_expected | |
7869 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7870 | ecs->event_thread->control.trap_expected = 0; | |
7871 | ||
7872 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7873 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7874 | keep_going_pass_signal (ecs); | |
7875 | } | |
7876 | ||
104c1213 JM |
7877 | /* This function normally comes after a resume, before |
7878 | handle_inferior_event exits. It takes care of any last bits of | |
7879 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7880 | |
104c1213 JM |
7881 | static void |
7882 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7883 | { |
4100594e | 7884 | infrun_log_debug ("prepare_to_wait"); |
104c1213 | 7885 | |
104c1213 | 7886 | ecs->wait_some_more = 1; |
0b333c5e PA |
7887 | |
7888 | if (!target_is_async_p ()) | |
7889 | mark_infrun_async_event_handler (); | |
c906108c | 7890 | } |
11cf8741 | 7891 | |
fd664c91 | 7892 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7893 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7894 | |
7895 | static void | |
bdc36728 | 7896 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7897 | { |
bdc36728 | 7898 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7899 | stop_waiting (ecs); |
fd664c91 PA |
7900 | } |
7901 | ||
33d62d64 JK |
7902 | /* Several print_*_reason functions to print why the inferior has stopped. |
7903 | We always print something when the inferior exits, or receives a signal. | |
7904 | The rest of the cases are dealt with later on in normal_stop and | |
7905 | print_it_typical. Ideally there should be a call to one of these | |
7906 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7907 | stop_waiting is called. |
33d62d64 | 7908 | |
fd664c91 PA |
7909 | Note that we don't call these directly, instead we delegate that to |
7910 | the interpreters, through observers. Interpreters then call these | |
7911 | with whatever uiout is right. */ | |
33d62d64 | 7912 | |
fd664c91 PA |
7913 | void |
7914 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7915 | { |
fd664c91 | 7916 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7917 | |
112e8700 | 7918 | if (uiout->is_mi_like_p ()) |
fd664c91 | 7919 | { |
112e8700 | 7920 | uiout->field_string ("reason", |
fd664c91 PA |
7921 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
7922 | } | |
7923 | } | |
33d62d64 | 7924 | |
fd664c91 PA |
7925 | void |
7926 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7927 | { |
33d62d64 | 7928 | annotate_signalled (); |
112e8700 SM |
7929 | if (uiout->is_mi_like_p ()) |
7930 | uiout->field_string | |
7931 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7932 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 7933 | annotate_signal_name (); |
112e8700 | 7934 | uiout->field_string ("signal-name", |
2ea28649 | 7935 | gdb_signal_to_name (siggnal)); |
33d62d64 | 7936 | annotate_signal_name_end (); |
112e8700 | 7937 | uiout->text (", "); |
33d62d64 | 7938 | annotate_signal_string (); |
112e8700 | 7939 | uiout->field_string ("signal-meaning", |
2ea28649 | 7940 | gdb_signal_to_string (siggnal)); |
33d62d64 | 7941 | annotate_signal_string_end (); |
112e8700 SM |
7942 | uiout->text (".\n"); |
7943 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
7944 | } |
7945 | ||
fd664c91 PA |
7946 | void |
7947 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7948 | { |
fda326dd | 7949 | struct inferior *inf = current_inferior (); |
a068643d | 7950 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 7951 | |
33d62d64 JK |
7952 | annotate_exited (exitstatus); |
7953 | if (exitstatus) | |
7954 | { | |
112e8700 SM |
7955 | if (uiout->is_mi_like_p ()) |
7956 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
7957 | std::string exit_code_str |
7958 | = string_printf ("0%o", (unsigned int) exitstatus); | |
7959 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
7960 | plongest (inf->num), pidstr.c_str (), | |
7961 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
7962 | } |
7963 | else | |
11cf8741 | 7964 | { |
112e8700 SM |
7965 | if (uiout->is_mi_like_p ()) |
7966 | uiout->field_string | |
7967 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
7968 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
7969 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 7970 | } |
33d62d64 JK |
7971 | } |
7972 | ||
012b3a21 WT |
7973 | /* Some targets/architectures can do extra processing/display of |
7974 | segmentation faults. E.g., Intel MPX boundary faults. | |
7975 | Call the architecture dependent function to handle the fault. */ | |
7976 | ||
7977 | static void | |
7978 | handle_segmentation_fault (struct ui_out *uiout) | |
7979 | { | |
7980 | struct regcache *regcache = get_current_regcache (); | |
ac7936df | 7981 | struct gdbarch *gdbarch = regcache->arch (); |
012b3a21 WT |
7982 | |
7983 | if (gdbarch_handle_segmentation_fault_p (gdbarch)) | |
7984 | gdbarch_handle_segmentation_fault (gdbarch, uiout); | |
7985 | } | |
7986 | ||
fd664c91 PA |
7987 | void |
7988 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 7989 | { |
f303dbd6 PA |
7990 | struct thread_info *thr = inferior_thread (); |
7991 | ||
33d62d64 JK |
7992 | annotate_signal (); |
7993 | ||
112e8700 | 7994 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
7995 | ; |
7996 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 7997 | { |
f303dbd6 | 7998 | const char *name; |
33d62d64 | 7999 | |
112e8700 | 8000 | uiout->text ("\nThread "); |
33eca680 | 8001 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 PA |
8002 | |
8003 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
8004 | if (name != NULL) | |
8005 | { | |
112e8700 | 8006 | uiout->text (" \""); |
33eca680 | 8007 | uiout->field_string ("name", name); |
112e8700 | 8008 | uiout->text ("\""); |
f303dbd6 | 8009 | } |
33d62d64 | 8010 | } |
f303dbd6 | 8011 | else |
112e8700 | 8012 | uiout->text ("\nProgram"); |
f303dbd6 | 8013 | |
112e8700 SM |
8014 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8015 | uiout->text (" stopped"); | |
33d62d64 JK |
8016 | else |
8017 | { | |
112e8700 | 8018 | uiout->text (" received signal "); |
8b93c638 | 8019 | annotate_signal_name (); |
112e8700 SM |
8020 | if (uiout->is_mi_like_p ()) |
8021 | uiout->field_string | |
8022 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8023 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8024 | annotate_signal_name_end (); |
112e8700 | 8025 | uiout->text (", "); |
8b93c638 | 8026 | annotate_signal_string (); |
112e8700 | 8027 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 WT |
8028 | |
8029 | if (siggnal == GDB_SIGNAL_SEGV) | |
8030 | handle_segmentation_fault (uiout); | |
8031 | ||
8b93c638 | 8032 | annotate_signal_string_end (); |
33d62d64 | 8033 | } |
112e8700 | 8034 | uiout->text (".\n"); |
33d62d64 | 8035 | } |
252fbfc8 | 8036 | |
fd664c91 PA |
8037 | void |
8038 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8039 | { |
112e8700 | 8040 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8041 | } |
43ff13b4 | 8042 | |
0c7e1a46 PA |
8043 | /* Print current location without a level number, if we have changed |
8044 | functions or hit a breakpoint. Print source line if we have one. | |
8045 | bpstat_print contains the logic deciding in detail what to print, | |
8046 | based on the event(s) that just occurred. */ | |
8047 | ||
243a9253 PA |
8048 | static void |
8049 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8050 | { |
8051 | int bpstat_ret; | |
f486487f | 8052 | enum print_what source_flag; |
0c7e1a46 PA |
8053 | int do_frame_printing = 1; |
8054 | struct thread_info *tp = inferior_thread (); | |
8055 | ||
8056 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8057 | switch (bpstat_ret) | |
8058 | { | |
8059 | case PRINT_UNKNOWN: | |
8060 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8061 | should) carry around the function and does (or should) use | |
8062 | that when doing a frame comparison. */ | |
8063 | if (tp->control.stop_step | |
8064 | && frame_id_eq (tp->control.step_frame_id, | |
8065 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
8066 | && (tp->control.step_start_function |
8067 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
8068 | { |
8069 | /* Finished step, just print source line. */ | |
8070 | source_flag = SRC_LINE; | |
8071 | } | |
8072 | else | |
8073 | { | |
8074 | /* Print location and source line. */ | |
8075 | source_flag = SRC_AND_LOC; | |
8076 | } | |
8077 | break; | |
8078 | case PRINT_SRC_AND_LOC: | |
8079 | /* Print location and source line. */ | |
8080 | source_flag = SRC_AND_LOC; | |
8081 | break; | |
8082 | case PRINT_SRC_ONLY: | |
8083 | source_flag = SRC_LINE; | |
8084 | break; | |
8085 | case PRINT_NOTHING: | |
8086 | /* Something bogus. */ | |
8087 | source_flag = SRC_LINE; | |
8088 | do_frame_printing = 0; | |
8089 | break; | |
8090 | default: | |
8091 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8092 | } | |
8093 | ||
8094 | /* The behavior of this routine with respect to the source | |
8095 | flag is: | |
8096 | SRC_LINE: Print only source line | |
8097 | LOCATION: Print only location | |
8098 | SRC_AND_LOC: Print location and source line. */ | |
8099 | if (do_frame_printing) | |
8100 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8101 | } |
8102 | ||
243a9253 PA |
8103 | /* See infrun.h. */ |
8104 | ||
8105 | void | |
4c7d57e7 | 8106 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8107 | { |
243a9253 | 8108 | struct target_waitstatus last; |
243a9253 PA |
8109 | struct thread_info *tp; |
8110 | ||
5b6d1e4f | 8111 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8112 | |
67ad9399 TT |
8113 | { |
8114 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8115 | |
67ad9399 | 8116 | print_stop_location (&last); |
243a9253 | 8117 | |
67ad9399 | 8118 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8119 | if (displays) |
8120 | do_displays (); | |
67ad9399 | 8121 | } |
243a9253 PA |
8122 | |
8123 | tp = inferior_thread (); | |
8124 | if (tp->thread_fsm != NULL | |
46e3ed7f | 8125 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
8126 | { |
8127 | struct return_value_info *rv; | |
8128 | ||
46e3ed7f | 8129 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
8130 | if (rv != NULL) |
8131 | print_return_value (uiout, rv); | |
8132 | } | |
0c7e1a46 PA |
8133 | } |
8134 | ||
388a7084 PA |
8135 | /* See infrun.h. */ |
8136 | ||
8137 | void | |
8138 | maybe_remove_breakpoints (void) | |
8139 | { | |
8140 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
8141 | { | |
8142 | if (remove_breakpoints ()) | |
8143 | { | |
223ffa71 | 8144 | target_terminal::ours_for_output (); |
388a7084 PA |
8145 | printf_filtered (_("Cannot remove breakpoints because " |
8146 | "program is no longer writable.\nFurther " | |
8147 | "execution is probably impossible.\n")); | |
8148 | } | |
8149 | } | |
8150 | } | |
8151 | ||
4c2f2a79 PA |
8152 | /* The execution context that just caused a normal stop. */ |
8153 | ||
8154 | struct stop_context | |
8155 | { | |
2d844eaf TT |
8156 | stop_context (); |
8157 | ~stop_context (); | |
8158 | ||
8159 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8160 | ||
8161 | bool changed () const; | |
8162 | ||
4c2f2a79 PA |
8163 | /* The stop ID. */ |
8164 | ULONGEST stop_id; | |
c906108c | 8165 | |
4c2f2a79 | 8166 | /* The event PTID. */ |
c906108c | 8167 | |
4c2f2a79 PA |
8168 | ptid_t ptid; |
8169 | ||
8170 | /* If stopp for a thread event, this is the thread that caused the | |
8171 | stop. */ | |
8172 | struct thread_info *thread; | |
8173 | ||
8174 | /* The inferior that caused the stop. */ | |
8175 | int inf_num; | |
8176 | }; | |
8177 | ||
2d844eaf | 8178 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8179 | takes a strong reference to the thread. */ |
8180 | ||
2d844eaf | 8181 | stop_context::stop_context () |
4c2f2a79 | 8182 | { |
2d844eaf TT |
8183 | stop_id = get_stop_id (); |
8184 | ptid = inferior_ptid; | |
8185 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8186 | |
d7e15655 | 8187 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8188 | { |
8189 | /* Take a strong reference so that the thread can't be deleted | |
8190 | yet. */ | |
2d844eaf TT |
8191 | thread = inferior_thread (); |
8192 | thread->incref (); | |
4c2f2a79 PA |
8193 | } |
8194 | else | |
2d844eaf | 8195 | thread = NULL; |
4c2f2a79 PA |
8196 | } |
8197 | ||
8198 | /* Release a stop context previously created with save_stop_context. | |
8199 | Releases the strong reference to the thread as well. */ | |
8200 | ||
2d844eaf | 8201 | stop_context::~stop_context () |
4c2f2a79 | 8202 | { |
2d844eaf TT |
8203 | if (thread != NULL) |
8204 | thread->decref (); | |
4c2f2a79 PA |
8205 | } |
8206 | ||
8207 | /* Return true if the current context no longer matches the saved stop | |
8208 | context. */ | |
8209 | ||
2d844eaf TT |
8210 | bool |
8211 | stop_context::changed () const | |
8212 | { | |
8213 | if (ptid != inferior_ptid) | |
8214 | return true; | |
8215 | if (inf_num != current_inferior ()->num) | |
8216 | return true; | |
8217 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8218 | return true; | |
8219 | if (get_stop_id () != stop_id) | |
8220 | return true; | |
8221 | return false; | |
4c2f2a79 PA |
8222 | } |
8223 | ||
8224 | /* See infrun.h. */ | |
8225 | ||
8226 | int | |
96baa820 | 8227 | normal_stop (void) |
c906108c | 8228 | { |
73b65bb0 | 8229 | struct target_waitstatus last; |
73b65bb0 | 8230 | |
5b6d1e4f | 8231 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8232 | |
4c2f2a79 PA |
8233 | new_stop_id (); |
8234 | ||
29f49a6a PA |
8235 | /* If an exception is thrown from this point on, make sure to |
8236 | propagate GDB's knowledge of the executing state to the | |
8237 | frontend/user running state. A QUIT is an easy exception to see | |
8238 | here, so do this before any filtered output. */ | |
731f534f | 8239 | |
5b6d1e4f | 8240 | ptid_t finish_ptid = null_ptid; |
731f534f | 8241 | |
c35b1492 | 8242 | if (!non_stop) |
5b6d1e4f | 8243 | finish_ptid = minus_one_ptid; |
e1316e60 PA |
8244 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8245 | || last.kind == TARGET_WAITKIND_EXITED) | |
8246 | { | |
8247 | /* On some targets, we may still have live threads in the | |
8248 | inferior when we get a process exit event. E.g., for | |
8249 | "checkpoint", when the current checkpoint/fork exits, | |
8250 | linux-fork.c automatically switches to another fork from | |
8251 | within target_mourn_inferior. */ | |
731f534f | 8252 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8253 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 PA |
8254 | } |
8255 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5b6d1e4f PA |
8256 | finish_ptid = inferior_ptid; |
8257 | ||
8258 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8259 | if (finish_ptid != null_ptid) | |
8260 | { | |
8261 | maybe_finish_thread_state.emplace | |
8262 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8263 | } | |
29f49a6a | 8264 | |
b57bacec PA |
8265 | /* As we're presenting a stop, and potentially removing breakpoints, |
8266 | update the thread list so we can tell whether there are threads | |
8267 | running on the target. With target remote, for example, we can | |
8268 | only learn about new threads when we explicitly update the thread | |
8269 | list. Do this before notifying the interpreters about signal | |
8270 | stops, end of stepping ranges, etc., so that the "new thread" | |
8271 | output is emitted before e.g., "Program received signal FOO", | |
8272 | instead of after. */ | |
8273 | update_thread_list (); | |
8274 | ||
8275 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 8276 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 8277 | |
c906108c SS |
8278 | /* As with the notification of thread events, we want to delay |
8279 | notifying the user that we've switched thread context until | |
8280 | the inferior actually stops. | |
8281 | ||
73b65bb0 DJ |
8282 | There's no point in saying anything if the inferior has exited. |
8283 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8284 | "received a signal". |
8285 | ||
8286 | Also skip saying anything in non-stop mode. In that mode, as we | |
8287 | don't want GDB to switch threads behind the user's back, to avoid | |
8288 | races where the user is typing a command to apply to thread x, | |
8289 | but GDB switches to thread y before the user finishes entering | |
8290 | the command, fetch_inferior_event installs a cleanup to restore | |
8291 | the current thread back to the thread the user had selected right | |
8292 | after this event is handled, so we're not really switching, only | |
8293 | informing of a stop. */ | |
4f8d22e3 | 8294 | if (!non_stop |
731f534f | 8295 | && previous_inferior_ptid != inferior_ptid |
73b65bb0 DJ |
8296 | && target_has_execution |
8297 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8298 | && last.kind != TARGET_WAITKIND_EXITED |
8299 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8300 | { |
0e454242 | 8301 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8302 | { |
223ffa71 | 8303 | target_terminal::ours_for_output (); |
3b12939d | 8304 | printf_filtered (_("[Switching to %s]\n"), |
a068643d | 8305 | target_pid_to_str (inferior_ptid).c_str ()); |
3b12939d PA |
8306 | annotate_thread_changed (); |
8307 | } | |
39f77062 | 8308 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8309 | } |
c906108c | 8310 | |
0e5bf2a8 PA |
8311 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8312 | { | |
0e454242 | 8313 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8314 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8315 | { | |
223ffa71 | 8316 | target_terminal::ours_for_output (); |
3b12939d PA |
8317 | printf_filtered (_("No unwaited-for children left.\n")); |
8318 | } | |
0e5bf2a8 PA |
8319 | } |
8320 | ||
b57bacec | 8321 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8322 | maybe_remove_breakpoints (); |
c906108c | 8323 | |
c906108c SS |
8324 | /* If an auto-display called a function and that got a signal, |
8325 | delete that auto-display to avoid an infinite recursion. */ | |
8326 | ||
8327 | if (stopped_by_random_signal) | |
8328 | disable_current_display (); | |
8329 | ||
0e454242 | 8330 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8331 | { |
8332 | async_enable_stdin (); | |
8333 | } | |
c906108c | 8334 | |
388a7084 | 8335 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8336 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8337 | |
8338 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8339 | and current location is based on that. Handle the case where the | |
8340 | dummy call is returning after being stopped. E.g. the dummy call | |
8341 | previously hit a breakpoint. (If the dummy call returns | |
8342 | normally, we won't reach here.) Do this before the stop hook is | |
8343 | run, so that it doesn't get to see the temporary dummy frame, | |
8344 | which is not where we'll present the stop. */ | |
8345 | if (has_stack_frames ()) | |
8346 | { | |
8347 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8348 | { | |
8349 | /* Pop the empty frame that contains the stack dummy. This | |
8350 | also restores inferior state prior to the call (struct | |
8351 | infcall_suspend_state). */ | |
8352 | struct frame_info *frame = get_current_frame (); | |
8353 | ||
8354 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8355 | frame_pop (frame); | |
8356 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8357 | does which means there's now no selected frame. */ | |
8358 | } | |
8359 | ||
8360 | select_frame (get_current_frame ()); | |
8361 | ||
8362 | /* Set the current source location. */ | |
8363 | set_current_sal_from_frame (get_current_frame ()); | |
8364 | } | |
dd7e2d2b PA |
8365 | |
8366 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8367 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8368 | if (stop_command != NULL) |
8369 | { | |
2d844eaf | 8370 | stop_context saved_context; |
4c2f2a79 | 8371 | |
a70b8144 | 8372 | try |
bf469271 PA |
8373 | { |
8374 | execute_cmd_pre_hook (stop_command); | |
8375 | } | |
230d2906 | 8376 | catch (const gdb_exception &ex) |
bf469271 PA |
8377 | { |
8378 | exception_fprintf (gdb_stderr, ex, | |
8379 | "Error while running hook_stop:\n"); | |
8380 | } | |
4c2f2a79 PA |
8381 | |
8382 | /* If the stop hook resumes the target, then there's no point in | |
8383 | trying to notify about the previous stop; its context is | |
8384 | gone. Likewise if the command switches thread or inferior -- | |
8385 | the observers would print a stop for the wrong | |
8386 | thread/inferior. */ | |
2d844eaf TT |
8387 | if (saved_context.changed ()) |
8388 | return 1; | |
4c2f2a79 | 8389 | } |
dd7e2d2b | 8390 | |
388a7084 PA |
8391 | /* Notify observers about the stop. This is where the interpreters |
8392 | print the stop event. */ | |
d7e15655 | 8393 | if (inferior_ptid != null_ptid) |
76727919 | 8394 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
388a7084 PA |
8395 | stop_print_frame); |
8396 | else | |
76727919 | 8397 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8398 | |
243a9253 PA |
8399 | annotate_stopped (); |
8400 | ||
48844aa6 PA |
8401 | if (target_has_execution) |
8402 | { | |
8403 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
fe726667 PA |
8404 | && last.kind != TARGET_WAITKIND_EXITED |
8405 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8406 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8407 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8408 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8409 | } |
6c95b8df PA |
8410 | |
8411 | /* Try to get rid of automatically added inferiors that are no | |
8412 | longer needed. Keeping those around slows down things linearly. | |
8413 | Note that this never removes the current inferior. */ | |
8414 | prune_inferiors (); | |
4c2f2a79 PA |
8415 | |
8416 | return 0; | |
c906108c | 8417 | } |
c906108c | 8418 | \f |
c5aa993b | 8419 | int |
96baa820 | 8420 | signal_stop_state (int signo) |
c906108c | 8421 | { |
d6b48e9c | 8422 | return signal_stop[signo]; |
c906108c SS |
8423 | } |
8424 | ||
c5aa993b | 8425 | int |
96baa820 | 8426 | signal_print_state (int signo) |
c906108c SS |
8427 | { |
8428 | return signal_print[signo]; | |
8429 | } | |
8430 | ||
c5aa993b | 8431 | int |
96baa820 | 8432 | signal_pass_state (int signo) |
c906108c SS |
8433 | { |
8434 | return signal_program[signo]; | |
8435 | } | |
8436 | ||
2455069d UW |
8437 | static void |
8438 | signal_cache_update (int signo) | |
8439 | { | |
8440 | if (signo == -1) | |
8441 | { | |
a493e3e2 | 8442 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8443 | signal_cache_update (signo); |
8444 | ||
8445 | return; | |
8446 | } | |
8447 | ||
8448 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8449 | && signal_print[signo] == 0 | |
ab04a2af TT |
8450 | && signal_program[signo] == 1 |
8451 | && signal_catch[signo] == 0); | |
2455069d UW |
8452 | } |
8453 | ||
488f131b | 8454 | int |
7bda5e4a | 8455 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8456 | { |
8457 | int ret = signal_stop[signo]; | |
abbb1732 | 8458 | |
d4f3574e | 8459 | signal_stop[signo] = state; |
2455069d | 8460 | signal_cache_update (signo); |
d4f3574e SS |
8461 | return ret; |
8462 | } | |
8463 | ||
488f131b | 8464 | int |
7bda5e4a | 8465 | signal_print_update (int signo, int state) |
d4f3574e SS |
8466 | { |
8467 | int ret = signal_print[signo]; | |
abbb1732 | 8468 | |
d4f3574e | 8469 | signal_print[signo] = state; |
2455069d | 8470 | signal_cache_update (signo); |
d4f3574e SS |
8471 | return ret; |
8472 | } | |
8473 | ||
488f131b | 8474 | int |
7bda5e4a | 8475 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8476 | { |
8477 | int ret = signal_program[signo]; | |
abbb1732 | 8478 | |
d4f3574e | 8479 | signal_program[signo] = state; |
2455069d | 8480 | signal_cache_update (signo); |
d4f3574e SS |
8481 | return ret; |
8482 | } | |
8483 | ||
ab04a2af TT |
8484 | /* Update the global 'signal_catch' from INFO and notify the |
8485 | target. */ | |
8486 | ||
8487 | void | |
8488 | signal_catch_update (const unsigned int *info) | |
8489 | { | |
8490 | int i; | |
8491 | ||
8492 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8493 | signal_catch[i] = info[i] > 0; | |
8494 | signal_cache_update (-1); | |
adc6a863 | 8495 | target_pass_signals (signal_pass); |
ab04a2af TT |
8496 | } |
8497 | ||
c906108c | 8498 | static void |
96baa820 | 8499 | sig_print_header (void) |
c906108c | 8500 | { |
3e43a32a MS |
8501 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8502 | "to program\tDescription\n")); | |
c906108c SS |
8503 | } |
8504 | ||
8505 | static void | |
2ea28649 | 8506 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8507 | { |
2ea28649 | 8508 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8509 | int name_padding = 13 - strlen (name); |
96baa820 | 8510 | |
c906108c SS |
8511 | if (name_padding <= 0) |
8512 | name_padding = 0; | |
8513 | ||
8514 | printf_filtered ("%s", name); | |
488f131b | 8515 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8516 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8517 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8518 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8519 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8520 | } |
8521 | ||
8522 | /* Specify how various signals in the inferior should be handled. */ | |
8523 | ||
8524 | static void | |
0b39b52e | 8525 | handle_command (const char *args, int from_tty) |
c906108c | 8526 | { |
c906108c | 8527 | int digits, wordlen; |
b926417a | 8528 | int sigfirst, siglast; |
2ea28649 | 8529 | enum gdb_signal oursig; |
c906108c | 8530 | int allsigs; |
c906108c SS |
8531 | |
8532 | if (args == NULL) | |
8533 | { | |
e2e0b3e5 | 8534 | error_no_arg (_("signal to handle")); |
c906108c SS |
8535 | } |
8536 | ||
1777feb0 | 8537 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8538 | |
adc6a863 PA |
8539 | const size_t nsigs = GDB_SIGNAL_LAST; |
8540 | unsigned char sigs[nsigs] {}; | |
c906108c | 8541 | |
1777feb0 | 8542 | /* Break the command line up into args. */ |
c906108c | 8543 | |
773a1edc | 8544 | gdb_argv built_argv (args); |
c906108c SS |
8545 | |
8546 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8547 | actions. Signal numbers and signal names may be interspersed with | |
8548 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8549 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8550 | |
773a1edc | 8551 | for (char *arg : built_argv) |
c906108c | 8552 | { |
773a1edc TT |
8553 | wordlen = strlen (arg); |
8554 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8555 | {; |
8556 | } | |
8557 | allsigs = 0; | |
8558 | sigfirst = siglast = -1; | |
8559 | ||
773a1edc | 8560 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8561 | { |
8562 | /* Apply action to all signals except those used by the | |
1777feb0 | 8563 | debugger. Silently skip those. */ |
c906108c SS |
8564 | allsigs = 1; |
8565 | sigfirst = 0; | |
8566 | siglast = nsigs - 1; | |
8567 | } | |
773a1edc | 8568 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8569 | { |
8570 | SET_SIGS (nsigs, sigs, signal_stop); | |
8571 | SET_SIGS (nsigs, sigs, signal_print); | |
8572 | } | |
773a1edc | 8573 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8574 | { |
8575 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8576 | } | |
773a1edc | 8577 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8578 | { |
8579 | SET_SIGS (nsigs, sigs, signal_print); | |
8580 | } | |
773a1edc | 8581 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8582 | { |
8583 | SET_SIGS (nsigs, sigs, signal_program); | |
8584 | } | |
773a1edc | 8585 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8586 | { |
8587 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8588 | } | |
773a1edc | 8589 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8590 | { |
8591 | SET_SIGS (nsigs, sigs, signal_program); | |
8592 | } | |
773a1edc | 8593 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8594 | { |
8595 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8596 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8597 | } | |
773a1edc | 8598 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8599 | { |
8600 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8601 | } | |
8602 | else if (digits > 0) | |
8603 | { | |
8604 | /* It is numeric. The numeric signal refers to our own | |
8605 | internal signal numbering from target.h, not to host/target | |
8606 | signal number. This is a feature; users really should be | |
8607 | using symbolic names anyway, and the common ones like | |
8608 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8609 | ||
8610 | sigfirst = siglast = (int) | |
773a1edc TT |
8611 | gdb_signal_from_command (atoi (arg)); |
8612 | if (arg[digits] == '-') | |
c906108c SS |
8613 | { |
8614 | siglast = (int) | |
773a1edc | 8615 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8616 | } |
8617 | if (sigfirst > siglast) | |
8618 | { | |
1777feb0 | 8619 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8620 | std::swap (sigfirst, siglast); |
c906108c SS |
8621 | } |
8622 | } | |
8623 | else | |
8624 | { | |
773a1edc | 8625 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8626 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8627 | { |
8628 | sigfirst = siglast = (int) oursig; | |
8629 | } | |
8630 | else | |
8631 | { | |
8632 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8633 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8634 | } |
8635 | } | |
8636 | ||
8637 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8638 | which signals to apply actions to. */ |
c906108c | 8639 | |
b926417a | 8640 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8641 | { |
2ea28649 | 8642 | switch ((enum gdb_signal) signum) |
c906108c | 8643 | { |
a493e3e2 PA |
8644 | case GDB_SIGNAL_TRAP: |
8645 | case GDB_SIGNAL_INT: | |
c906108c SS |
8646 | if (!allsigs && !sigs[signum]) |
8647 | { | |
9e2f0ad4 | 8648 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8649 | Are you sure you want to change it? "), |
2ea28649 | 8650 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8651 | { |
8652 | sigs[signum] = 1; | |
8653 | } | |
8654 | else | |
c119e040 | 8655 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8656 | } |
8657 | break; | |
a493e3e2 PA |
8658 | case GDB_SIGNAL_0: |
8659 | case GDB_SIGNAL_DEFAULT: | |
8660 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8661 | /* Make sure that "all" doesn't print these. */ |
8662 | break; | |
8663 | default: | |
8664 | sigs[signum] = 1; | |
8665 | break; | |
8666 | } | |
8667 | } | |
c906108c SS |
8668 | } |
8669 | ||
b926417a | 8670 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8671 | if (sigs[signum]) |
8672 | { | |
2455069d | 8673 | signal_cache_update (-1); |
adc6a863 PA |
8674 | target_pass_signals (signal_pass); |
8675 | target_program_signals (signal_program); | |
c906108c | 8676 | |
3a031f65 PA |
8677 | if (from_tty) |
8678 | { | |
8679 | /* Show the results. */ | |
8680 | sig_print_header (); | |
8681 | for (; signum < nsigs; signum++) | |
8682 | if (sigs[signum]) | |
aead7601 | 8683 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8684 | } |
8685 | ||
8686 | break; | |
8687 | } | |
c906108c SS |
8688 | } |
8689 | ||
de0bea00 MF |
8690 | /* Complete the "handle" command. */ |
8691 | ||
eb3ff9a5 | 8692 | static void |
de0bea00 | 8693 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8694 | completion_tracker &tracker, |
6f937416 | 8695 | const char *text, const char *word) |
de0bea00 | 8696 | { |
de0bea00 MF |
8697 | static const char * const keywords[] = |
8698 | { | |
8699 | "all", | |
8700 | "stop", | |
8701 | "ignore", | |
8702 | "print", | |
8703 | "pass", | |
8704 | "nostop", | |
8705 | "noignore", | |
8706 | "noprint", | |
8707 | "nopass", | |
8708 | NULL, | |
8709 | }; | |
8710 | ||
eb3ff9a5 PA |
8711 | signal_completer (ignore, tracker, text, word); |
8712 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8713 | } |
8714 | ||
2ea28649 PA |
8715 | enum gdb_signal |
8716 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8717 | { |
8718 | if (num >= 1 && num <= 15) | |
2ea28649 | 8719 | return (enum gdb_signal) num; |
ed01b82c PA |
8720 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8721 | Use \"info signals\" for a list of symbolic signals.")); | |
8722 | } | |
8723 | ||
c906108c SS |
8724 | /* Print current contents of the tables set by the handle command. |
8725 | It is possible we should just be printing signals actually used | |
8726 | by the current target (but for things to work right when switching | |
8727 | targets, all signals should be in the signal tables). */ | |
8728 | ||
8729 | static void | |
1d12d88f | 8730 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8731 | { |
2ea28649 | 8732 | enum gdb_signal oursig; |
abbb1732 | 8733 | |
c906108c SS |
8734 | sig_print_header (); |
8735 | ||
8736 | if (signum_exp) | |
8737 | { | |
8738 | /* First see if this is a symbol name. */ | |
2ea28649 | 8739 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8740 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8741 | { |
8742 | /* No, try numeric. */ | |
8743 | oursig = | |
2ea28649 | 8744 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8745 | } |
8746 | sig_print_info (oursig); | |
8747 | return; | |
8748 | } | |
8749 | ||
8750 | printf_filtered ("\n"); | |
8751 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8752 | for (oursig = GDB_SIGNAL_FIRST; |
8753 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8754 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8755 | { |
8756 | QUIT; | |
8757 | ||
a493e3e2 PA |
8758 | if (oursig != GDB_SIGNAL_UNKNOWN |
8759 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8760 | sig_print_info (oursig); |
8761 | } | |
8762 | ||
3e43a32a MS |
8763 | printf_filtered (_("\nUse the \"handle\" command " |
8764 | "to change these tables.\n")); | |
c906108c | 8765 | } |
4aa995e1 PA |
8766 | |
8767 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8768 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8769 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8770 | also dependent on which thread you have selected. |
8771 | ||
8772 | 1. making $_siginfo be an internalvar that creates a new value on | |
8773 | access. | |
8774 | ||
8775 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8776 | ||
8777 | /* This function implements the lval_computed support for reading a | |
8778 | $_siginfo value. */ | |
8779 | ||
8780 | static void | |
8781 | siginfo_value_read (struct value *v) | |
8782 | { | |
8783 | LONGEST transferred; | |
8784 | ||
a911d87a PA |
8785 | /* If we can access registers, so can we access $_siginfo. Likewise |
8786 | vice versa. */ | |
8787 | validate_registers_access (); | |
c709acd1 | 8788 | |
4aa995e1 | 8789 | transferred = |
8b88a78e | 8790 | target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, |
4aa995e1 PA |
8791 | NULL, |
8792 | value_contents_all_raw (v), | |
8793 | value_offset (v), | |
8794 | TYPE_LENGTH (value_type (v))); | |
8795 | ||
8796 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8797 | error (_("Unable to read siginfo")); | |
8798 | } | |
8799 | ||
8800 | /* This function implements the lval_computed support for writing a | |
8801 | $_siginfo value. */ | |
8802 | ||
8803 | static void | |
8804 | siginfo_value_write (struct value *v, struct value *fromval) | |
8805 | { | |
8806 | LONGEST transferred; | |
8807 | ||
a911d87a PA |
8808 | /* If we can access registers, so can we access $_siginfo. Likewise |
8809 | vice versa. */ | |
8810 | validate_registers_access (); | |
c709acd1 | 8811 | |
8b88a78e | 8812 | transferred = target_write (current_top_target (), |
4aa995e1 PA |
8813 | TARGET_OBJECT_SIGNAL_INFO, |
8814 | NULL, | |
8815 | value_contents_all_raw (fromval), | |
8816 | value_offset (v), | |
8817 | TYPE_LENGTH (value_type (fromval))); | |
8818 | ||
8819 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8820 | error (_("Unable to write siginfo")); | |
8821 | } | |
8822 | ||
c8f2448a | 8823 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8824 | { |
8825 | siginfo_value_read, | |
8826 | siginfo_value_write | |
8827 | }; | |
8828 | ||
8829 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8830 | the current thread using architecture GDBARCH. Return a void value |
8831 | if there's no object available. */ | |
4aa995e1 | 8832 | |
2c0b251b | 8833 | static struct value * |
22d2b532 SDJ |
8834 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8835 | void *ignore) | |
4aa995e1 | 8836 | { |
4aa995e1 | 8837 | if (target_has_stack |
d7e15655 | 8838 | && inferior_ptid != null_ptid |
78267919 | 8839 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 8840 | { |
78267919 | 8841 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8842 | |
78267919 | 8843 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8844 | } |
8845 | ||
78267919 | 8846 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8847 | } |
8848 | ||
c906108c | 8849 | \f |
16c381f0 JK |
8850 | /* infcall_suspend_state contains state about the program itself like its |
8851 | registers and any signal it received when it last stopped. | |
8852 | This state must be restored regardless of how the inferior function call | |
8853 | ends (either successfully, or after it hits a breakpoint or signal) | |
8854 | if the program is to properly continue where it left off. */ | |
8855 | ||
6bf78e29 | 8856 | class infcall_suspend_state |
7a292a7a | 8857 | { |
6bf78e29 AB |
8858 | public: |
8859 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
8860 | once the inferior function call has finished. */ | |
8861 | infcall_suspend_state (struct gdbarch *gdbarch, | |
8862 | const struct thread_info *tp, | |
8863 | struct regcache *regcache) | |
8864 | : m_thread_suspend (tp->suspend), | |
8865 | m_registers (new readonly_detached_regcache (*regcache)) | |
8866 | { | |
8867 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
8868 | ||
8869 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8870 | { | |
8871 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8872 | size_t len = TYPE_LENGTH (type); | |
8873 | ||
8874 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); | |
8875 | ||
8876 | if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8877 | siginfo_data.get (), 0, len) != len) | |
8878 | { | |
8879 | /* Errors ignored. */ | |
8880 | siginfo_data.reset (nullptr); | |
8881 | } | |
8882 | } | |
8883 | ||
8884 | if (siginfo_data) | |
8885 | { | |
8886 | m_siginfo_gdbarch = gdbarch; | |
8887 | m_siginfo_data = std::move (siginfo_data); | |
8888 | } | |
8889 | } | |
8890 | ||
8891 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 8892 | |
6bf78e29 AB |
8893 | readonly_detached_regcache *registers () const |
8894 | { | |
8895 | return m_registers.get (); | |
8896 | } | |
8897 | ||
8898 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
8899 | ||
8900 | void restore (struct gdbarch *gdbarch, | |
8901 | struct thread_info *tp, | |
8902 | struct regcache *regcache) const | |
8903 | { | |
8904 | tp->suspend = m_thread_suspend; | |
8905 | ||
8906 | if (m_siginfo_gdbarch == gdbarch) | |
8907 | { | |
8908 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8909 | ||
8910 | /* Errors ignored. */ | |
8911 | target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8912 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); | |
8913 | } | |
8914 | ||
8915 | /* The inferior can be gone if the user types "print exit(0)" | |
8916 | (and perhaps other times). */ | |
8917 | if (target_has_execution) | |
8918 | /* NB: The register write goes through to the target. */ | |
8919 | regcache->restore (registers ()); | |
8920 | } | |
8921 | ||
8922 | private: | |
8923 | /* How the current thread stopped before the inferior function call was | |
8924 | executed. */ | |
8925 | struct thread_suspend_state m_thread_suspend; | |
8926 | ||
8927 | /* The registers before the inferior function call was executed. */ | |
8928 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 8929 | |
35515841 | 8930 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 8931 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
8932 | |
8933 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8934 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8935 | content would be invalid. */ | |
6bf78e29 | 8936 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
8937 | }; |
8938 | ||
cb524840 TT |
8939 | infcall_suspend_state_up |
8940 | save_infcall_suspend_state () | |
b89667eb | 8941 | { |
b89667eb | 8942 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 8943 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8944 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 8945 | |
6bf78e29 AB |
8946 | infcall_suspend_state_up inf_state |
8947 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 8948 | |
6bf78e29 AB |
8949 | /* Having saved the current state, adjust the thread state, discarding |
8950 | any stop signal information. The stop signal is not useful when | |
8951 | starting an inferior function call, and run_inferior_call will not use | |
8952 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 8953 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 8954 | |
b89667eb DE |
8955 | return inf_state; |
8956 | } | |
8957 | ||
8958 | /* Restore inferior session state to INF_STATE. */ | |
8959 | ||
8960 | void | |
16c381f0 | 8961 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8962 | { |
8963 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 8964 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8965 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 8966 | |
6bf78e29 | 8967 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 8968 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8969 | } |
8970 | ||
b89667eb | 8971 | void |
16c381f0 | 8972 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 8973 | { |
dd848631 | 8974 | delete inf_state; |
b89667eb DE |
8975 | } |
8976 | ||
daf6667d | 8977 | readonly_detached_regcache * |
16c381f0 | 8978 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 8979 | { |
6bf78e29 | 8980 | return inf_state->registers (); |
b89667eb DE |
8981 | } |
8982 | ||
16c381f0 JK |
8983 | /* infcall_control_state contains state regarding gdb's control of the |
8984 | inferior itself like stepping control. It also contains session state like | |
8985 | the user's currently selected frame. */ | |
b89667eb | 8986 | |
16c381f0 | 8987 | struct infcall_control_state |
b89667eb | 8988 | { |
16c381f0 JK |
8989 | struct thread_control_state thread_control; |
8990 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
8991 | |
8992 | /* Other fields: */ | |
ee841dd8 TT |
8993 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
8994 | int stopped_by_random_signal = 0; | |
7a292a7a | 8995 | |
b89667eb | 8996 | /* ID if the selected frame when the inferior function call was made. */ |
ee841dd8 | 8997 | struct frame_id selected_frame_id {}; |
7a292a7a SS |
8998 | }; |
8999 | ||
c906108c | 9000 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9001 | connection. */ |
c906108c | 9002 | |
cb524840 TT |
9003 | infcall_control_state_up |
9004 | save_infcall_control_state () | |
c906108c | 9005 | { |
cb524840 | 9006 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9007 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9008 | struct inferior *inf = current_inferior (); |
7a292a7a | 9009 | |
16c381f0 JK |
9010 | inf_status->thread_control = tp->control; |
9011 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9012 | |
8358c15c | 9013 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9014 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9015 | |
16c381f0 JK |
9016 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9017 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9018 | hand them back the original chain when restore_infcall_control_state is | |
9019 | called. */ | |
9020 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9021 | |
9022 | /* Other fields: */ | |
9023 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9024 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9025 | |
206415a3 | 9026 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 9027 | |
7a292a7a | 9028 | return inf_status; |
c906108c SS |
9029 | } |
9030 | ||
bf469271 PA |
9031 | static void |
9032 | restore_selected_frame (const frame_id &fid) | |
c906108c | 9033 | { |
bf469271 | 9034 | frame_info *frame = frame_find_by_id (fid); |
c906108c | 9035 | |
aa0cd9c1 AC |
9036 | /* If inf_status->selected_frame_id is NULL, there was no previously |
9037 | selected frame. */ | |
101dcfbe | 9038 | if (frame == NULL) |
c906108c | 9039 | { |
8a3fe4f8 | 9040 | warning (_("Unable to restore previously selected frame.")); |
bf469271 | 9041 | return; |
c906108c SS |
9042 | } |
9043 | ||
0f7d239c | 9044 | select_frame (frame); |
c906108c SS |
9045 | } |
9046 | ||
b89667eb DE |
9047 | /* Restore inferior session state to INF_STATUS. */ |
9048 | ||
c906108c | 9049 | void |
16c381f0 | 9050 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9051 | { |
4e1c45ea | 9052 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9053 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9054 | |
8358c15c JK |
9055 | if (tp->control.step_resume_breakpoint) |
9056 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9057 | ||
5b79abe7 TT |
9058 | if (tp->control.exception_resume_breakpoint) |
9059 | tp->control.exception_resume_breakpoint->disposition | |
9060 | = disp_del_at_next_stop; | |
9061 | ||
d82142e2 | 9062 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9063 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9064 | |
16c381f0 JK |
9065 | tp->control = inf_status->thread_control; |
9066 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9067 | |
9068 | /* Other fields: */ | |
9069 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9070 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9071 | |
b89667eb | 9072 | if (target_has_stack) |
c906108c | 9073 | { |
bf469271 | 9074 | /* The point of the try/catch is that if the stack is clobbered, |
101dcfbe AC |
9075 | walking the stack might encounter a garbage pointer and |
9076 | error() trying to dereference it. */ | |
a70b8144 | 9077 | try |
bf469271 PA |
9078 | { |
9079 | restore_selected_frame (inf_status->selected_frame_id); | |
9080 | } | |
230d2906 | 9081 | catch (const gdb_exception_error &ex) |
bf469271 PA |
9082 | { |
9083 | exception_fprintf (gdb_stderr, ex, | |
9084 | "Unable to restore previously selected frame:\n"); | |
9085 | /* Error in restoring the selected frame. Select the | |
9086 | innermost frame. */ | |
9087 | select_frame (get_current_frame ()); | |
9088 | } | |
c906108c | 9089 | } |
c906108c | 9090 | |
ee841dd8 | 9091 | delete inf_status; |
7a292a7a | 9092 | } |
c906108c SS |
9093 | |
9094 | void | |
16c381f0 | 9095 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9096 | { |
8358c15c JK |
9097 | if (inf_status->thread_control.step_resume_breakpoint) |
9098 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9099 | = disp_del_at_next_stop; | |
9100 | ||
5b79abe7 TT |
9101 | if (inf_status->thread_control.exception_resume_breakpoint) |
9102 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9103 | = disp_del_at_next_stop; | |
9104 | ||
1777feb0 | 9105 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9106 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9107 | |
ee841dd8 | 9108 | delete inf_status; |
7a292a7a | 9109 | } |
b89667eb | 9110 | \f |
7f89fd65 | 9111 | /* See infrun.h. */ |
0c557179 SDJ |
9112 | |
9113 | void | |
9114 | clear_exit_convenience_vars (void) | |
9115 | { | |
9116 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9117 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9118 | } | |
c5aa993b | 9119 | \f |
488f131b | 9120 | |
b2175913 MS |
9121 | /* User interface for reverse debugging: |
9122 | Set exec-direction / show exec-direction commands | |
9123 | (returns error unless target implements to_set_exec_direction method). */ | |
9124 | ||
170742de | 9125 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9126 | static const char exec_forward[] = "forward"; |
9127 | static const char exec_reverse[] = "reverse"; | |
9128 | static const char *exec_direction = exec_forward; | |
40478521 | 9129 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9130 | exec_forward, |
9131 | exec_reverse, | |
9132 | NULL | |
9133 | }; | |
9134 | ||
9135 | static void | |
eb4c3f4a | 9136 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9137 | struct cmd_list_element *cmd) |
9138 | { | |
9139 | if (target_can_execute_reverse) | |
9140 | { | |
9141 | if (!strcmp (exec_direction, exec_forward)) | |
9142 | execution_direction = EXEC_FORWARD; | |
9143 | else if (!strcmp (exec_direction, exec_reverse)) | |
9144 | execution_direction = EXEC_REVERSE; | |
9145 | } | |
8bbed405 MS |
9146 | else |
9147 | { | |
9148 | exec_direction = exec_forward; | |
9149 | error (_("Target does not support this operation.")); | |
9150 | } | |
b2175913 MS |
9151 | } |
9152 | ||
9153 | static void | |
9154 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9155 | struct cmd_list_element *cmd, const char *value) | |
9156 | { | |
9157 | switch (execution_direction) { | |
9158 | case EXEC_FORWARD: | |
9159 | fprintf_filtered (out, _("Forward.\n")); | |
9160 | break; | |
9161 | case EXEC_REVERSE: | |
9162 | fprintf_filtered (out, _("Reverse.\n")); | |
9163 | break; | |
b2175913 | 9164 | default: |
d8b34453 PA |
9165 | internal_error (__FILE__, __LINE__, |
9166 | _("bogus execution_direction value: %d"), | |
9167 | (int) execution_direction); | |
b2175913 MS |
9168 | } |
9169 | } | |
9170 | ||
d4db2f36 PA |
9171 | static void |
9172 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9173 | struct cmd_list_element *c, const char *value) | |
9174 | { | |
3e43a32a MS |
9175 | fprintf_filtered (file, _("Resuming the execution of threads " |
9176 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9177 | } |
ad52ddc6 | 9178 | |
22d2b532 SDJ |
9179 | /* Implementation of `siginfo' variable. */ |
9180 | ||
9181 | static const struct internalvar_funcs siginfo_funcs = | |
9182 | { | |
9183 | siginfo_make_value, | |
9184 | NULL, | |
9185 | NULL | |
9186 | }; | |
9187 | ||
372316f1 PA |
9188 | /* Callback for infrun's target events source. This is marked when a |
9189 | thread has a pending status to process. */ | |
9190 | ||
9191 | static void | |
9192 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9193 | { | |
372316f1 PA |
9194 | inferior_event_handler (INF_REG_EVENT, NULL); |
9195 | } | |
9196 | ||
6c265988 | 9197 | void _initialize_infrun (); |
c906108c | 9198 | void |
6c265988 | 9199 | _initialize_infrun () |
c906108c | 9200 | { |
de0bea00 | 9201 | struct cmd_list_element *c; |
c906108c | 9202 | |
372316f1 PA |
9203 | /* Register extra event sources in the event loop. */ |
9204 | infrun_async_inferior_event_token | |
9205 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
9206 | ||
11db9430 | 9207 | add_info ("signals", info_signals_command, _("\ |
1bedd215 AC |
9208 | What debugger does when program gets various signals.\n\ |
9209 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9210 | add_info_alias ("handle", "signals", 0); |
9211 | ||
de0bea00 | 9212 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9213 | Specify how to handle signals.\n\ |
486c7739 | 9214 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9215 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9216 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9217 | will be displayed instead.\n\ |
9218 | \n\ | |
c906108c SS |
9219 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9220 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9221 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9222 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9223 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9224 | \n\ |
1bedd215 | 9225 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9226 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9227 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9228 | Print means print a message if this signal happens.\n\ | |
9229 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9230 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9231 | Pass and Stop may be combined.\n\ |
9232 | \n\ | |
9233 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9234 | may be interspersed with actions, with the actions being performed for\n\ | |
9235 | all signals cumulatively specified.")); | |
de0bea00 | 9236 | set_cmd_completer (c, handle_completer); |
486c7739 | 9237 | |
c906108c | 9238 | if (!dbx_commands) |
1a966eab AC |
9239 | stop_command = add_cmd ("stop", class_obscure, |
9240 | not_just_help_class_command, _("\ | |
9241 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9242 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9243 | of the program stops."), &cmdlist); |
c906108c | 9244 | |
ccce17b0 | 9245 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9246 | Set inferior debugging."), _("\ |
9247 | Show inferior debugging."), _("\ | |
9248 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9249 | NULL, |
9250 | show_debug_infrun, | |
9251 | &setdebuglist, &showdebuglist); | |
527159b7 | 9252 | |
3e43a32a MS |
9253 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9254 | &debug_displaced, _("\ | |
237fc4c9 PA |
9255 | Set displaced stepping debugging."), _("\ |
9256 | Show displaced stepping debugging."), _("\ | |
9257 | When non-zero, displaced stepping specific debugging is enabled."), | |
9258 | NULL, | |
9259 | show_debug_displaced, | |
9260 | &setdebuglist, &showdebuglist); | |
9261 | ||
ad52ddc6 PA |
9262 | add_setshow_boolean_cmd ("non-stop", no_class, |
9263 | &non_stop_1, _("\ | |
9264 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9265 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9266 | When debugging a multi-threaded program and this setting is\n\ | |
9267 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9268 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9269 | all other threads in the program while you interact with the thread of\n\ | |
9270 | interest. When you continue or step a thread, you can allow the other\n\ | |
9271 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9272 | thread's state, all threads stop.\n\ | |
9273 | \n\ | |
9274 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9275 | to run freely. You'll be able to step each thread independently,\n\ | |
9276 | leave it stopped or free to run as needed."), | |
9277 | set_non_stop, | |
9278 | show_non_stop, | |
9279 | &setlist, | |
9280 | &showlist); | |
9281 | ||
adc6a863 | 9282 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9283 | { |
9284 | signal_stop[i] = 1; | |
9285 | signal_print[i] = 1; | |
9286 | signal_program[i] = 1; | |
ab04a2af | 9287 | signal_catch[i] = 0; |
c906108c SS |
9288 | } |
9289 | ||
4d9d9d04 PA |
9290 | /* Signals caused by debugger's own actions should not be given to |
9291 | the program afterwards. | |
9292 | ||
9293 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9294 | explicitly specifies that it should be delivered to the target | |
9295 | program. Typically, that would occur when a user is debugging a | |
9296 | target monitor on a simulator: the target monitor sets a | |
9297 | breakpoint; the simulator encounters this breakpoint and halts | |
9298 | the simulation handing control to GDB; GDB, noting that the stop | |
9299 | address doesn't map to any known breakpoint, returns control back | |
9300 | to the simulator; the simulator then delivers the hardware | |
9301 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9302 | debugged. */ | |
a493e3e2 PA |
9303 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9304 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9305 | |
9306 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9307 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9308 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9309 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9310 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9311 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9312 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9313 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9314 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9315 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9316 | signal_print[GDB_SIGNAL_IO] = 0; | |
9317 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9318 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9319 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9320 | signal_print[GDB_SIGNAL_URG] = 0; | |
9321 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9322 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9323 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9324 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9325 | |
cd0fc7c3 SS |
9326 | /* These signals are used internally by user-level thread |
9327 | implementations. (See signal(5) on Solaris.) Like the above | |
9328 | signals, a healthy program receives and handles them as part of | |
9329 | its normal operation. */ | |
a493e3e2 PA |
9330 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9331 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9332 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9333 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9334 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9335 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9336 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9337 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9338 | |
2455069d UW |
9339 | /* Update cached state. */ |
9340 | signal_cache_update (-1); | |
9341 | ||
85c07804 AC |
9342 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9343 | &stop_on_solib_events, _("\ | |
9344 | Set stopping for shared library events."), _("\ | |
9345 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9346 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9347 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9348 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9349 | set_stop_on_solib_events, |
920d2a44 | 9350 | show_stop_on_solib_events, |
85c07804 | 9351 | &setlist, &showlist); |
c906108c | 9352 | |
7ab04401 AC |
9353 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9354 | follow_fork_mode_kind_names, | |
9355 | &follow_fork_mode_string, _("\ | |
9356 | Set debugger response to a program call of fork or vfork."), _("\ | |
9357 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9358 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9359 | parent - the original process is debugged after a fork\n\ | |
9360 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9361 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9362 | By default, the debugger will follow the parent process."), |
9363 | NULL, | |
920d2a44 | 9364 | show_follow_fork_mode_string, |
7ab04401 AC |
9365 | &setlist, &showlist); |
9366 | ||
6c95b8df PA |
9367 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9368 | follow_exec_mode_names, | |
9369 | &follow_exec_mode_string, _("\ | |
9370 | Set debugger response to a program call of exec."), _("\ | |
9371 | Show debugger response to a program call of exec."), _("\ | |
9372 | An exec call replaces the program image of a process.\n\ | |
9373 | \n\ | |
9374 | follow-exec-mode can be:\n\ | |
9375 | \n\ | |
cce7e648 | 9376 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9377 | to this new inferior. The program the process was running before\n\ |
9378 | the exec call can be restarted afterwards by restarting the original\n\ | |
9379 | inferior.\n\ | |
9380 | \n\ | |
9381 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9382 | The new executable image replaces the previous executable loaded in\n\ | |
9383 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9384 | the executable the process was running after the exec call.\n\ | |
9385 | \n\ | |
9386 | By default, the debugger will use the same inferior."), | |
9387 | NULL, | |
9388 | show_follow_exec_mode_string, | |
9389 | &setlist, &showlist); | |
9390 | ||
7ab04401 AC |
9391 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9392 | scheduler_enums, &scheduler_mode, _("\ | |
9393 | Set mode for locking scheduler during execution."), _("\ | |
9394 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9395 | off == no locking (threads may preempt at any time)\n\ |
9396 | on == full locking (no thread except the current thread may run)\n\ | |
9397 | This applies to both normal execution and replay mode.\n\ | |
9398 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9399 | In this mode, other threads may run during other commands.\n\ | |
9400 | This applies to both normal execution and replay mode.\n\ | |
9401 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9402 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9403 | show_scheduler_mode, |
7ab04401 | 9404 | &setlist, &showlist); |
5fbbeb29 | 9405 | |
d4db2f36 PA |
9406 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9407 | Set mode for resuming threads of all processes."), _("\ | |
9408 | Show mode for resuming threads of all processes."), _("\ | |
9409 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9410 | threads of all processes. When off (which is the default), execution\n\ | |
9411 | commands only resume the threads of the current process. The set of\n\ | |
9412 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9413 | mode (see help set scheduler-locking)."), | |
9414 | NULL, | |
9415 | show_schedule_multiple, | |
9416 | &setlist, &showlist); | |
9417 | ||
5bf193a2 AC |
9418 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9419 | Set mode of the step operation."), _("\ | |
9420 | Show mode of the step operation."), _("\ | |
9421 | When set, doing a step over a function without debug line information\n\ | |
9422 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9423 | function is skipped and the step command stops at a different source line."), | |
9424 | NULL, | |
920d2a44 | 9425 | show_step_stop_if_no_debug, |
5bf193a2 | 9426 | &setlist, &showlist); |
ca6724c1 | 9427 | |
72d0e2c5 YQ |
9428 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9429 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9430 | Set debugger's willingness to use displaced stepping."), _("\ |
9431 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9432 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9433 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9434 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9435 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9436 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9437 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9438 | NULL, |
9439 | show_can_use_displaced_stepping, | |
9440 | &setlist, &showlist); | |
237fc4c9 | 9441 | |
b2175913 MS |
9442 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9443 | &exec_direction, _("Set direction of execution.\n\ | |
9444 | Options are 'forward' or 'reverse'."), | |
9445 | _("Show direction of execution (forward/reverse)."), | |
9446 | _("Tells gdb whether to execute forward or backward."), | |
9447 | set_exec_direction_func, show_exec_direction_func, | |
9448 | &setlist, &showlist); | |
9449 | ||
6c95b8df PA |
9450 | /* Set/show detach-on-fork: user-settable mode. */ |
9451 | ||
9452 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9453 | Set whether gdb will detach the child of a fork."), _("\ | |
9454 | Show whether gdb will detach the child of a fork."), _("\ | |
9455 | Tells gdb whether to detach the child of a fork."), | |
9456 | NULL, NULL, &setlist, &showlist); | |
9457 | ||
03583c20 UW |
9458 | /* Set/show disable address space randomization mode. */ |
9459 | ||
9460 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9461 | &disable_randomization, _("\ | |
9462 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9463 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9464 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9465 | address space is disabled. Standalone programs run with the randomization\n\ | |
9466 | enabled by default on some platforms."), | |
9467 | &set_disable_randomization, | |
9468 | &show_disable_randomization, | |
9469 | &setlist, &showlist); | |
9470 | ||
ca6724c1 | 9471 | /* ptid initializations */ |
ca6724c1 KB |
9472 | inferior_ptid = null_ptid; |
9473 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9474 | |
76727919 TT |
9475 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed); |
9476 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested); | |
9477 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit); | |
9478 | gdb::observers::inferior_exit.attach (infrun_inferior_exit); | |
4aa995e1 PA |
9479 | |
9480 | /* Explicitly create without lookup, since that tries to create a | |
9481 | value with a void typed value, and when we get here, gdbarch | |
9482 | isn't initialized yet. At this point, we're quite sure there | |
9483 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9484 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9485 | |
9486 | add_setshow_boolean_cmd ("observer", no_class, | |
9487 | &observer_mode_1, _("\ | |
9488 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9489 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9490 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9491 | affect its execution. Registers and memory may not be changed,\n\ | |
9492 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9493 | or signalled."), | |
9494 | set_observer_mode, | |
9495 | show_observer_mode, | |
9496 | &setlist, | |
9497 | &showlist); | |
c906108c | 9498 | } |