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" | |
9844051a | 22 | #include "displaced-stepping.h" |
edbcda09 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" |
9844051a | 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 | ||
edbcda09 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 | ||
edbcda09 | 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 | 506 | push_target (parent_inf->process_target ()); |
18493a00 PA |
507 | thread_info *child_thr |
508 | = add_thread_silent (child_inf->process_target (), 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; | |
18493a00 PA |
526 | |
527 | /* Now that the inferiors and program spaces are all | |
528 | wired up, we can switch to the child thread (which | |
529 | switches inferior and program space too). */ | |
530 | switch_to_thread (child_thr); | |
d83ad864 DB |
531 | } |
532 | else | |
533 | { | |
534 | child_inf->aspace = new_address_space (); | |
564b1e3f | 535 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
536 | child_inf->removable = 1; |
537 | set_current_program_space (child_inf->pspace); | |
538 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
539 | ||
18493a00 PA |
540 | /* solib_create_inferior_hook relies on the current |
541 | thread. */ | |
542 | switch_to_thread (child_thr); | |
543 | ||
d83ad864 DB |
544 | /* Let the shared library layer (e.g., solib-svr4) learn |
545 | about this new process, relocate the cloned exec, pull | |
546 | in shared libraries, and install the solib event | |
547 | breakpoint. If a "cloned-VM" event was propagated | |
548 | better throughout the core, this wouldn't be | |
549 | required. */ | |
550 | solib_create_inferior_hook (0); | |
551 | } | |
d83ad864 DB |
552 | } |
553 | ||
554 | if (has_vforked) | |
555 | { | |
556 | struct inferior *parent_inf; | |
557 | ||
558 | parent_inf = current_inferior (); | |
559 | ||
560 | /* If we detached from the child, then we have to be careful | |
561 | to not insert breakpoints in the parent until the child | |
562 | is done with the shared memory region. However, if we're | |
563 | staying attached to the child, then we can and should | |
564 | insert breakpoints, so that we can debug it. A | |
565 | subsequent child exec or exit is enough to know when does | |
566 | the child stops using the parent's address space. */ | |
567 | parent_inf->waiting_for_vfork_done = detach_fork; | |
568 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
569 | } | |
570 | } | |
571 | else | |
572 | { | |
573 | /* Follow the child. */ | |
574 | struct inferior *parent_inf, *child_inf; | |
575 | struct program_space *parent_pspace; | |
576 | ||
f67c0c91 | 577 | if (print_inferior_events) |
d83ad864 | 578 | { |
f67c0c91 SDJ |
579 | std::string parent_pid = target_pid_to_str (parent_ptid); |
580 | std::string child_pid = target_pid_to_str (child_ptid); | |
581 | ||
223ffa71 | 582 | target_terminal::ours_for_output (); |
6f259a23 | 583 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
584 | _("[Attaching after %s %s to child %s]\n"), |
585 | parent_pid.c_str (), | |
6f259a23 | 586 | has_vforked ? "vfork" : "fork", |
f67c0c91 | 587 | child_pid.c_str ()); |
d83ad864 DB |
588 | } |
589 | ||
590 | /* Add the new inferior first, so that the target_detach below | |
591 | doesn't unpush the target. */ | |
592 | ||
e99b03dc | 593 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
594 | |
595 | parent_inf = current_inferior (); | |
596 | child_inf->attach_flag = parent_inf->attach_flag; | |
597 | copy_terminal_info (child_inf, parent_inf); | |
598 | child_inf->gdbarch = parent_inf->gdbarch; | |
599 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
600 | ||
601 | parent_pspace = parent_inf->pspace; | |
602 | ||
5b6d1e4f | 603 | process_stratum_target *target = parent_inf->process_target (); |
d83ad864 | 604 | |
5b6d1e4f PA |
605 | { |
606 | /* Hold a strong reference to the target while (maybe) | |
607 | detaching the parent. Otherwise detaching could close the | |
608 | target. */ | |
609 | auto target_ref = target_ops_ref::new_reference (target); | |
610 | ||
611 | /* If we're vforking, we want to hold on to the parent until | |
612 | the child exits or execs. At child exec or exit time we | |
613 | can remove the old breakpoints from the parent and detach | |
614 | or resume debugging it. Otherwise, detach the parent now; | |
615 | we'll want to reuse it's program/address spaces, but we | |
616 | can't set them to the child before removing breakpoints | |
617 | from the parent, otherwise, the breakpoints module could | |
618 | decide to remove breakpoints from the wrong process (since | |
619 | they'd be assigned to the same address space). */ | |
620 | ||
621 | if (has_vforked) | |
622 | { | |
623 | gdb_assert (child_inf->vfork_parent == NULL); | |
624 | gdb_assert (parent_inf->vfork_child == NULL); | |
625 | child_inf->vfork_parent = parent_inf; | |
626 | child_inf->pending_detach = 0; | |
627 | parent_inf->vfork_child = child_inf; | |
628 | parent_inf->pending_detach = detach_fork; | |
629 | parent_inf->waiting_for_vfork_done = 0; | |
630 | } | |
631 | else if (detach_fork) | |
632 | { | |
633 | if (print_inferior_events) | |
634 | { | |
635 | /* Ensure that we have a process ptid. */ | |
636 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
637 | ||
638 | target_terminal::ours_for_output (); | |
639 | fprintf_filtered (gdb_stdlog, | |
640 | _("[Detaching after fork from " | |
641 | "parent %s]\n"), | |
642 | target_pid_to_str (process_ptid).c_str ()); | |
643 | } | |
8dd06f7a | 644 | |
5b6d1e4f PA |
645 | target_detach (parent_inf, 0); |
646 | parent_inf = NULL; | |
647 | } | |
6f259a23 | 648 | |
5b6d1e4f | 649 | /* Note that the detach above makes PARENT_INF dangling. */ |
d83ad864 | 650 | |
5b6d1e4f PA |
651 | /* Add the child thread to the appropriate lists, and switch |
652 | to this new thread, before cloning the program space, and | |
653 | informing the solib layer about this new process. */ | |
d83ad864 | 654 | |
5b6d1e4f PA |
655 | set_current_inferior (child_inf); |
656 | push_target (target); | |
657 | } | |
d83ad864 | 658 | |
18493a00 | 659 | thread_info *child_thr = add_thread_silent (target, child_ptid); |
d83ad864 DB |
660 | |
661 | /* If this is a vfork child, then the address-space is shared | |
662 | with the parent. If we detached from the parent, then we can | |
663 | reuse the parent's program/address spaces. */ | |
664 | if (has_vforked || detach_fork) | |
665 | { | |
666 | child_inf->pspace = parent_pspace; | |
667 | child_inf->aspace = child_inf->pspace->aspace; | |
5b6d1e4f PA |
668 | |
669 | exec_on_vfork (); | |
d83ad864 DB |
670 | } |
671 | else | |
672 | { | |
673 | child_inf->aspace = new_address_space (); | |
564b1e3f | 674 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
675 | child_inf->removable = 1; |
676 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
677 | set_current_program_space (child_inf->pspace); | |
678 | clone_program_space (child_inf->pspace, parent_pspace); | |
679 | ||
680 | /* Let the shared library layer (e.g., solib-svr4) learn | |
681 | about this new process, relocate the cloned exec, pull in | |
682 | shared libraries, and install the solib event breakpoint. | |
683 | If a "cloned-VM" event was propagated better throughout | |
684 | the core, this wouldn't be required. */ | |
685 | solib_create_inferior_hook (0); | |
686 | } | |
18493a00 PA |
687 | |
688 | switch_to_thread (child_thr); | |
d83ad864 DB |
689 | } |
690 | ||
691 | return target_follow_fork (follow_child, detach_fork); | |
692 | } | |
693 | ||
e58b0e63 PA |
694 | /* Tell the target to follow the fork we're stopped at. Returns true |
695 | if the inferior should be resumed; false, if the target for some | |
696 | reason decided it's best not to resume. */ | |
697 | ||
5ab2fbf1 SM |
698 | static bool |
699 | follow_fork () | |
c906108c | 700 | { |
5ab2fbf1 SM |
701 | bool follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
702 | bool should_resume = true; | |
e58b0e63 PA |
703 | struct thread_info *tp; |
704 | ||
705 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
706 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
707 | parent thread structure's run control related fields, not just these. |
708 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
709 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 710 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
711 | CORE_ADDR step_range_start = 0; |
712 | CORE_ADDR step_range_end = 0; | |
bf4cb9be TV |
713 | int current_line = 0; |
714 | symtab *current_symtab = NULL; | |
4e3990f4 | 715 | struct frame_id step_frame_id = { 0 }; |
8980e177 | 716 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
717 | |
718 | if (!non_stop) | |
719 | { | |
5b6d1e4f | 720 | process_stratum_target *wait_target; |
e58b0e63 PA |
721 | ptid_t wait_ptid; |
722 | struct target_waitstatus wait_status; | |
723 | ||
724 | /* Get the last target status returned by target_wait(). */ | |
5b6d1e4f | 725 | get_last_target_status (&wait_target, &wait_ptid, &wait_status); |
e58b0e63 PA |
726 | |
727 | /* If not stopped at a fork event, then there's nothing else to | |
728 | do. */ | |
729 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
730 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
731 | return 1; | |
732 | ||
733 | /* Check if we switched over from WAIT_PTID, since the event was | |
734 | reported. */ | |
00431a78 | 735 | if (wait_ptid != minus_one_ptid |
5b6d1e4f PA |
736 | && (current_inferior ()->process_target () != wait_target |
737 | || inferior_ptid != wait_ptid)) | |
e58b0e63 PA |
738 | { |
739 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
740 | target to follow it (in either direction). We'll | |
741 | afterwards refuse to resume, and inform the user what | |
742 | happened. */ | |
5b6d1e4f | 743 | thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid); |
00431a78 | 744 | switch_to_thread (wait_thread); |
5ab2fbf1 | 745 | should_resume = false; |
e58b0e63 PA |
746 | } |
747 | } | |
748 | ||
749 | tp = inferior_thread (); | |
750 | ||
751 | /* If there were any forks/vforks that were caught and are now to be | |
752 | followed, then do so now. */ | |
753 | switch (tp->pending_follow.kind) | |
754 | { | |
755 | case TARGET_WAITKIND_FORKED: | |
756 | case TARGET_WAITKIND_VFORKED: | |
757 | { | |
758 | ptid_t parent, child; | |
759 | ||
760 | /* If the user did a next/step, etc, over a fork call, | |
761 | preserve the stepping state in the fork child. */ | |
762 | if (follow_child && should_resume) | |
763 | { | |
8358c15c JK |
764 | step_resume_breakpoint = clone_momentary_breakpoint |
765 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
766 | step_range_start = tp->control.step_range_start; |
767 | step_range_end = tp->control.step_range_end; | |
bf4cb9be TV |
768 | current_line = tp->current_line; |
769 | current_symtab = tp->current_symtab; | |
16c381f0 | 770 | step_frame_id = tp->control.step_frame_id; |
186c406b TT |
771 | exception_resume_breakpoint |
772 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 773 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
774 | |
775 | /* For now, delete the parent's sr breakpoint, otherwise, | |
776 | parent/child sr breakpoints are considered duplicates, | |
777 | and the child version will not be installed. Remove | |
778 | this when the breakpoints module becomes aware of | |
779 | inferiors and address spaces. */ | |
780 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
781 | tp->control.step_range_start = 0; |
782 | tp->control.step_range_end = 0; | |
783 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 784 | delete_exception_resume_breakpoint (tp); |
8980e177 | 785 | tp->thread_fsm = NULL; |
e58b0e63 PA |
786 | } |
787 | ||
788 | parent = inferior_ptid; | |
789 | child = tp->pending_follow.value.related_pid; | |
790 | ||
5b6d1e4f | 791 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
792 | /* Set up inferior(s) as specified by the caller, and tell the |
793 | target to do whatever is necessary to follow either parent | |
794 | or child. */ | |
795 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
796 | { |
797 | /* Target refused to follow, or there's some other reason | |
798 | we shouldn't resume. */ | |
799 | should_resume = 0; | |
800 | } | |
801 | else | |
802 | { | |
803 | /* This pending follow fork event is now handled, one way | |
804 | or another. The previous selected thread may be gone | |
805 | from the lists by now, but if it is still around, need | |
806 | to clear the pending follow request. */ | |
5b6d1e4f | 807 | tp = find_thread_ptid (parent_targ, parent); |
e58b0e63 PA |
808 | if (tp) |
809 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
810 | ||
811 | /* This makes sure we don't try to apply the "Switched | |
812 | over from WAIT_PID" logic above. */ | |
813 | nullify_last_target_wait_ptid (); | |
814 | ||
1777feb0 | 815 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
816 | if (follow_child) |
817 | { | |
5b6d1e4f | 818 | thread_info *child_thr = find_thread_ptid (parent_targ, child); |
00431a78 | 819 | switch_to_thread (child_thr); |
e58b0e63 PA |
820 | |
821 | /* ... and preserve the stepping state, in case the | |
822 | user was stepping over the fork call. */ | |
823 | if (should_resume) | |
824 | { | |
825 | tp = inferior_thread (); | |
8358c15c JK |
826 | tp->control.step_resume_breakpoint |
827 | = step_resume_breakpoint; | |
16c381f0 JK |
828 | tp->control.step_range_start = step_range_start; |
829 | tp->control.step_range_end = step_range_end; | |
bf4cb9be TV |
830 | tp->current_line = current_line; |
831 | tp->current_symtab = current_symtab; | |
16c381f0 | 832 | tp->control.step_frame_id = step_frame_id; |
186c406b TT |
833 | tp->control.exception_resume_breakpoint |
834 | = exception_resume_breakpoint; | |
8980e177 | 835 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
836 | } |
837 | else | |
838 | { | |
839 | /* If we get here, it was because we're trying to | |
840 | resume from a fork catchpoint, but, the user | |
841 | has switched threads away from the thread that | |
842 | forked. In that case, the resume command | |
843 | issued is most likely not applicable to the | |
844 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 845 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 846 | "before following fork child.")); |
e58b0e63 PA |
847 | } |
848 | ||
849 | /* Reset breakpoints in the child as appropriate. */ | |
850 | follow_inferior_reset_breakpoints (); | |
851 | } | |
e58b0e63 PA |
852 | } |
853 | } | |
854 | break; | |
855 | case TARGET_WAITKIND_SPURIOUS: | |
856 | /* Nothing to follow. */ | |
857 | break; | |
858 | default: | |
859 | internal_error (__FILE__, __LINE__, | |
860 | "Unexpected pending_follow.kind %d\n", | |
861 | tp->pending_follow.kind); | |
862 | break; | |
863 | } | |
c906108c | 864 | |
e58b0e63 | 865 | return should_resume; |
c906108c SS |
866 | } |
867 | ||
d83ad864 | 868 | static void |
6604731b | 869 | follow_inferior_reset_breakpoints (void) |
c906108c | 870 | { |
4e1c45ea PA |
871 | struct thread_info *tp = inferior_thread (); |
872 | ||
6604731b DJ |
873 | /* Was there a step_resume breakpoint? (There was if the user |
874 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
875 | thread number. Cloned step_resume breakpoints are disabled on |
876 | creation, so enable it here now that it is associated with the | |
877 | correct thread. | |
6604731b DJ |
878 | |
879 | step_resumes are a form of bp that are made to be per-thread. | |
880 | Since we created the step_resume bp when the parent process | |
881 | was being debugged, and now are switching to the child process, | |
882 | from the breakpoint package's viewpoint, that's a switch of | |
883 | "threads". We must update the bp's notion of which thread | |
884 | it is for, or it'll be ignored when it triggers. */ | |
885 | ||
8358c15c | 886 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
887 | { |
888 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
889 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
890 | } | |
6604731b | 891 | |
a1aa2221 | 892 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 893 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
894 | { |
895 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
896 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
897 | } | |
186c406b | 898 | |
6604731b DJ |
899 | /* Reinsert all breakpoints in the child. The user may have set |
900 | breakpoints after catching the fork, in which case those | |
901 | were never set in the child, but only in the parent. This makes | |
902 | sure the inserted breakpoints match the breakpoint list. */ | |
903 | ||
904 | breakpoint_re_set (); | |
905 | insert_breakpoints (); | |
c906108c | 906 | } |
c906108c | 907 | |
6c95b8df PA |
908 | /* The child has exited or execed: resume threads of the parent the |
909 | user wanted to be executing. */ | |
910 | ||
911 | static int | |
912 | proceed_after_vfork_done (struct thread_info *thread, | |
913 | void *arg) | |
914 | { | |
915 | int pid = * (int *) arg; | |
916 | ||
00431a78 PA |
917 | if (thread->ptid.pid () == pid |
918 | && thread->state == THREAD_RUNNING | |
919 | && !thread->executing | |
6c95b8df | 920 | && !thread->stop_requested |
a493e3e2 | 921 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df | 922 | { |
edbcda09 SM |
923 | infrun_log_debug ("resuming vfork parent thread %s", |
924 | target_pid_to_str (thread->ptid).c_str ()); | |
6c95b8df | 925 | |
00431a78 | 926 | switch_to_thread (thread); |
70509625 | 927 | clear_proceed_status (0); |
64ce06e4 | 928 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
929 | } |
930 | ||
931 | return 0; | |
932 | } | |
933 | ||
934 | /* Called whenever we notice an exec or exit event, to handle | |
935 | detaching or resuming a vfork parent. */ | |
936 | ||
937 | static void | |
938 | handle_vfork_child_exec_or_exit (int exec) | |
939 | { | |
940 | struct inferior *inf = current_inferior (); | |
941 | ||
942 | if (inf->vfork_parent) | |
943 | { | |
944 | int resume_parent = -1; | |
945 | ||
946 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
947 | between the parent and the child. Break the bonds. */ |
948 | inferior *vfork_parent = inf->vfork_parent; | |
949 | inf->vfork_parent->vfork_child = NULL; | |
950 | inf->vfork_parent = NULL; | |
6c95b8df | 951 | |
b73715df TV |
952 | /* If the user wanted to detach from the parent, now is the |
953 | time. */ | |
954 | if (vfork_parent->pending_detach) | |
6c95b8df | 955 | { |
6c95b8df PA |
956 | struct program_space *pspace; |
957 | struct address_space *aspace; | |
958 | ||
1777feb0 | 959 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 960 | |
b73715df | 961 | vfork_parent->pending_detach = 0; |
68c9da30 | 962 | |
18493a00 | 963 | scoped_restore_current_pspace_and_thread restore_thread; |
6c95b8df PA |
964 | |
965 | /* We're letting loose of the parent. */ | |
18493a00 | 966 | thread_info *tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 967 | switch_to_thread (tp); |
6c95b8df PA |
968 | |
969 | /* We're about to detach from the parent, which implicitly | |
970 | removes breakpoints from its address space. There's a | |
971 | catch here: we want to reuse the spaces for the child, | |
972 | but, parent/child are still sharing the pspace at this | |
973 | point, although the exec in reality makes the kernel give | |
974 | the child a fresh set of new pages. The problem here is | |
975 | that the breakpoints module being unaware of this, would | |
976 | likely chose the child process to write to the parent | |
977 | address space. Swapping the child temporarily away from | |
978 | the spaces has the desired effect. Yes, this is "sort | |
979 | of" a hack. */ | |
980 | ||
981 | pspace = inf->pspace; | |
982 | aspace = inf->aspace; | |
983 | inf->aspace = NULL; | |
984 | inf->pspace = NULL; | |
985 | ||
f67c0c91 | 986 | if (print_inferior_events) |
6c95b8df | 987 | { |
a068643d | 988 | std::string pidstr |
b73715df | 989 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 990 | |
223ffa71 | 991 | target_terminal::ours_for_output (); |
6c95b8df PA |
992 | |
993 | if (exec) | |
6f259a23 DB |
994 | { |
995 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 996 | _("[Detaching vfork parent %s " |
a068643d | 997 | "after child exec]\n"), pidstr.c_str ()); |
6f259a23 | 998 | } |
6c95b8df | 999 | else |
6f259a23 DB |
1000 | { |
1001 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 1002 | _("[Detaching vfork parent %s " |
a068643d | 1003 | "after child exit]\n"), pidstr.c_str ()); |
6f259a23 | 1004 | } |
6c95b8df PA |
1005 | } |
1006 | ||
b73715df | 1007 | target_detach (vfork_parent, 0); |
6c95b8df PA |
1008 | |
1009 | /* Put it back. */ | |
1010 | inf->pspace = pspace; | |
1011 | inf->aspace = aspace; | |
6c95b8df PA |
1012 | } |
1013 | else if (exec) | |
1014 | { | |
1015 | /* We're staying attached to the parent, so, really give the | |
1016 | child a new address space. */ | |
564b1e3f | 1017 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
1018 | inf->aspace = inf->pspace->aspace; |
1019 | inf->removable = 1; | |
1020 | set_current_program_space (inf->pspace); | |
1021 | ||
b73715df | 1022 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1023 | } |
1024 | else | |
1025 | { | |
6c95b8df PA |
1026 | /* If this is a vfork child exiting, then the pspace and |
1027 | aspaces were shared with the parent. Since we're | |
1028 | reporting the process exit, we'll be mourning all that is | |
1029 | found in the address space, and switching to null_ptid, | |
1030 | preparing to start a new inferior. But, since we don't | |
1031 | want to clobber the parent's address/program spaces, we | |
1032 | go ahead and create a new one for this exiting | |
1033 | inferior. */ | |
1034 | ||
18493a00 | 1035 | /* Switch to no-thread while running clone_program_space, so |
5ed8105e PA |
1036 | that clone_program_space doesn't want to read the |
1037 | selected frame of a dead process. */ | |
18493a00 PA |
1038 | scoped_restore_current_thread restore_thread; |
1039 | switch_to_no_thread (); | |
6c95b8df | 1040 | |
53af73bf PA |
1041 | inf->pspace = new program_space (maybe_new_address_space ()); |
1042 | inf->aspace = inf->pspace->aspace; | |
1043 | set_current_program_space (inf->pspace); | |
6c95b8df | 1044 | inf->removable = 1; |
7dcd53a0 | 1045 | inf->symfile_flags = SYMFILE_NO_READ; |
53af73bf | 1046 | clone_program_space (inf->pspace, vfork_parent->pspace); |
6c95b8df | 1047 | |
b73715df | 1048 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1049 | } |
1050 | ||
6c95b8df PA |
1051 | gdb_assert (current_program_space == inf->pspace); |
1052 | ||
1053 | if (non_stop && resume_parent != -1) | |
1054 | { | |
1055 | /* If the user wanted the parent to be running, let it go | |
1056 | free now. */ | |
5ed8105e | 1057 | scoped_restore_current_thread restore_thread; |
6c95b8df | 1058 | |
edbcda09 SM |
1059 | infrun_log_debug ("resuming vfork parent process %d", |
1060 | resume_parent); | |
6c95b8df PA |
1061 | |
1062 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1063 | } |
1064 | } | |
1065 | } | |
1066 | ||
eb6c553b | 1067 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1068 | |
1069 | static const char follow_exec_mode_new[] = "new"; | |
1070 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1071 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1072 | { |
1073 | follow_exec_mode_new, | |
1074 | follow_exec_mode_same, | |
1075 | NULL, | |
1076 | }; | |
1077 | ||
1078 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1079 | static void | |
1080 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1081 | struct cmd_list_element *c, const char *value) | |
1082 | { | |
1083 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1084 | } | |
1085 | ||
ecf45d2c | 1086 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1087 | |
c906108c | 1088 | static void |
4ca51187 | 1089 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1090 | { |
6c95b8df | 1091 | struct inferior *inf = current_inferior (); |
e99b03dc | 1092 | int pid = ptid.pid (); |
94585166 | 1093 | ptid_t process_ptid; |
7a292a7a | 1094 | |
65d2b333 PW |
1095 | /* Switch terminal for any messages produced e.g. by |
1096 | breakpoint_re_set. */ | |
1097 | target_terminal::ours_for_output (); | |
1098 | ||
c906108c SS |
1099 | /* This is an exec event that we actually wish to pay attention to. |
1100 | Refresh our symbol table to the newly exec'd program, remove any | |
1101 | momentary bp's, etc. | |
1102 | ||
1103 | If there are breakpoints, they aren't really inserted now, | |
1104 | since the exec() transformed our inferior into a fresh set | |
1105 | of instructions. | |
1106 | ||
1107 | We want to preserve symbolic breakpoints on the list, since | |
1108 | we have hopes that they can be reset after the new a.out's | |
1109 | symbol table is read. | |
1110 | ||
1111 | However, any "raw" breakpoints must be removed from the list | |
1112 | (e.g., the solib bp's), since their address is probably invalid | |
1113 | now. | |
1114 | ||
1115 | And, we DON'T want to call delete_breakpoints() here, since | |
1116 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1117 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1118 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1119 | |
1120 | mark_breakpoints_out (); | |
1121 | ||
95e50b27 PA |
1122 | /* The target reports the exec event to the main thread, even if |
1123 | some other thread does the exec, and even if the main thread was | |
1124 | stopped or already gone. We may still have non-leader threads of | |
1125 | the process on our list. E.g., on targets that don't have thread | |
1126 | exit events (like remote); or on native Linux in non-stop mode if | |
1127 | there were only two threads in the inferior and the non-leader | |
1128 | one is the one that execs (and nothing forces an update of the | |
1129 | thread list up to here). When debugging remotely, it's best to | |
1130 | avoid extra traffic, when possible, so avoid syncing the thread | |
1131 | list with the target, and instead go ahead and delete all threads | |
1132 | of the process but one that reported the event. Note this must | |
1133 | be done before calling update_breakpoints_after_exec, as | |
1134 | otherwise clearing the threads' resources would reference stale | |
1135 | thread breakpoints -- it may have been one of these threads that | |
1136 | stepped across the exec. We could just clear their stepping | |
1137 | states, but as long as we're iterating, might as well delete | |
1138 | them. Deleting them now rather than at the next user-visible | |
1139 | stop provides a nicer sequence of events for user and MI | |
1140 | notifications. */ | |
08036331 | 1141 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1142 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1143 | delete_thread (th); |
95e50b27 PA |
1144 | |
1145 | /* We also need to clear any left over stale state for the | |
1146 | leader/event thread. E.g., if there was any step-resume | |
1147 | breakpoint or similar, it's gone now. We cannot truly | |
1148 | step-to-next statement through an exec(). */ | |
08036331 | 1149 | thread_info *th = inferior_thread (); |
8358c15c | 1150 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1151 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1152 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1153 | th->control.step_range_start = 0; |
1154 | th->control.step_range_end = 0; | |
c906108c | 1155 | |
95e50b27 PA |
1156 | /* The user may have had the main thread held stopped in the |
1157 | previous image (e.g., schedlock on, or non-stop). Release | |
1158 | it now. */ | |
a75724bc PA |
1159 | th->stop_requested = 0; |
1160 | ||
95e50b27 PA |
1161 | update_breakpoints_after_exec (); |
1162 | ||
1777feb0 | 1163 | /* What is this a.out's name? */ |
f2907e49 | 1164 | process_ptid = ptid_t (pid); |
6c95b8df | 1165 | printf_unfiltered (_("%s is executing new program: %s\n"), |
a068643d | 1166 | target_pid_to_str (process_ptid).c_str (), |
ecf45d2c | 1167 | exec_file_target); |
c906108c SS |
1168 | |
1169 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1170 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1171 | |
6ca15a4b | 1172 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1173 | |
797bc1cb TT |
1174 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1175 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1176 | |
ecf45d2c SL |
1177 | /* If we were unable to map the executable target pathname onto a host |
1178 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1179 | is confusing. Maybe it would even be better to stop at this point | |
1180 | so that the user can specify a file manually before continuing. */ | |
1181 | if (exec_file_host == NULL) | |
1182 | warning (_("Could not load symbols for executable %s.\n" | |
1183 | "Do you need \"set sysroot\"?"), | |
1184 | exec_file_target); | |
c906108c | 1185 | |
cce9b6bf PA |
1186 | /* Reset the shared library package. This ensures that we get a |
1187 | shlib event when the child reaches "_start", at which point the | |
1188 | dld will have had a chance to initialize the child. */ | |
1189 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1190 | we don't want those to be satisfied by the libraries of the | |
1191 | previous incarnation of this process. */ | |
1192 | no_shared_libraries (NULL, 0); | |
1193 | ||
6c95b8df PA |
1194 | if (follow_exec_mode_string == follow_exec_mode_new) |
1195 | { | |
6c95b8df PA |
1196 | /* The user wants to keep the old inferior and program spaces |
1197 | around. Create a new fresh one, and switch to it. */ | |
1198 | ||
35ed81d4 SM |
1199 | /* Do exit processing for the original inferior before setting the new |
1200 | inferior's pid. Having two inferiors with the same pid would confuse | |
1201 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1202 | old to the new inferior. */ | |
1203 | inf = add_inferior_with_spaces (); | |
1204 | swap_terminal_info (inf, current_inferior ()); | |
057302ce | 1205 | exit_inferior_silent (current_inferior ()); |
17d8546e | 1206 | |
94585166 | 1207 | inf->pid = pid; |
ecf45d2c | 1208 | target_follow_exec (inf, exec_file_target); |
6c95b8df | 1209 | |
5b6d1e4f PA |
1210 | inferior *org_inferior = current_inferior (); |
1211 | switch_to_inferior_no_thread (inf); | |
1212 | push_target (org_inferior->process_target ()); | |
1213 | thread_info *thr = add_thread (inf->process_target (), ptid); | |
1214 | switch_to_thread (thr); | |
6c95b8df | 1215 | } |
9107fc8d PA |
1216 | else |
1217 | { | |
1218 | /* The old description may no longer be fit for the new image. | |
1219 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1220 | old description; we'll read a new one below. No need to do | |
1221 | this on "follow-exec-mode new", as the old inferior stays | |
1222 | around (its description is later cleared/refetched on | |
1223 | restart). */ | |
1224 | target_clear_description (); | |
1225 | } | |
6c95b8df PA |
1226 | |
1227 | gdb_assert (current_program_space == inf->pspace); | |
1228 | ||
ecf45d2c SL |
1229 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1230 | because the proper displacement for a PIE (Position Independent | |
1231 | Executable) main symbol file will only be computed by | |
1232 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1233 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1234 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1235 | |
9107fc8d PA |
1236 | /* If the target can specify a description, read it. Must do this |
1237 | after flipping to the new executable (because the target supplied | |
1238 | description must be compatible with the executable's | |
1239 | architecture, and the old executable may e.g., be 32-bit, while | |
1240 | the new one 64-bit), and before anything involving memory or | |
1241 | registers. */ | |
1242 | target_find_description (); | |
1243 | ||
268a4a75 | 1244 | solib_create_inferior_hook (0); |
c906108c | 1245 | |
4efc6507 DE |
1246 | jit_inferior_created_hook (); |
1247 | ||
c1e56572 JK |
1248 | breakpoint_re_set (); |
1249 | ||
c906108c SS |
1250 | /* Reinsert all breakpoints. (Those which were symbolic have |
1251 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1252 | to symbol_file_command...). */ |
c906108c SS |
1253 | insert_breakpoints (); |
1254 | ||
1255 | /* The next resume of this inferior should bring it to the shlib | |
1256 | startup breakpoints. (If the user had also set bp's on | |
1257 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1258 | matically get reset there in the new process.). */ |
c906108c SS |
1259 | } |
1260 | ||
c2829269 PA |
1261 | /* The queue of threads that need to do a step-over operation to get |
1262 | past e.g., a breakpoint. What technique is used to step over the | |
1263 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1264 | same queue, to maintain rough temporal order of execution, in order | |
1265 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1266 | constantly stepping the same couple threads past their breakpoints | |
1267 | over and over, if the single-step finish fast enough. */ | |
7bd43605 | 1268 | struct thread_info *global_thread_step_over_chain_head; |
c2829269 | 1269 | |
6c4cfb24 PA |
1270 | /* Bit flags indicating what the thread needs to step over. */ |
1271 | ||
8d297bbf | 1272 | enum step_over_what_flag |
6c4cfb24 PA |
1273 | { |
1274 | /* Step over a breakpoint. */ | |
1275 | STEP_OVER_BREAKPOINT = 1, | |
1276 | ||
1277 | /* Step past a non-continuable watchpoint, in order to let the | |
1278 | instruction execute so we can evaluate the watchpoint | |
1279 | expression. */ | |
1280 | STEP_OVER_WATCHPOINT = 2 | |
1281 | }; | |
8d297bbf | 1282 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1283 | |
963f9c80 | 1284 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1285 | |
1286 | struct step_over_info | |
1287 | { | |
963f9c80 PA |
1288 | /* If we're stepping past a breakpoint, this is the address space |
1289 | and address of the instruction the breakpoint is set at. We'll | |
1290 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1291 | non-NULL. */ | |
8b86c959 | 1292 | const address_space *aspace; |
31e77af2 | 1293 | CORE_ADDR address; |
963f9c80 PA |
1294 | |
1295 | /* The instruction being stepped over triggers a nonsteppable | |
1296 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1297 | int nonsteppable_watchpoint_p; | |
21edc42f YQ |
1298 | |
1299 | /* The thread's global number. */ | |
1300 | int thread; | |
31e77af2 PA |
1301 | }; |
1302 | ||
1303 | /* The step-over info of the location that is being stepped over. | |
1304 | ||
1305 | Note that with async/breakpoint always-inserted mode, a user might | |
1306 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1307 | being stepped over. As setting a new breakpoint inserts all | |
1308 | breakpoints, we need to make sure the breakpoint being stepped over | |
1309 | isn't inserted then. We do that by only clearing the step-over | |
1310 | info when the step-over is actually finished (or aborted). | |
1311 | ||
1312 | Presently GDB can only step over one breakpoint at any given time. | |
1313 | Given threads that can't run code in the same address space as the | |
1314 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1315 | to step-over at most one breakpoint per address space (so this info | |
1316 | could move to the address space object if/when GDB is extended). | |
1317 | The set of breakpoints being stepped over will normally be much | |
1318 | smaller than the set of all breakpoints, so a flag in the | |
1319 | breakpoint location structure would be wasteful. A separate list | |
1320 | also saves complexity and run-time, as otherwise we'd have to go | |
1321 | through all breakpoint locations clearing their flag whenever we | |
1322 | start a new sequence. Similar considerations weigh against storing | |
1323 | this info in the thread object. Plus, not all step overs actually | |
1324 | have breakpoint locations -- e.g., stepping past a single-step | |
1325 | breakpoint, or stepping to complete a non-continuable | |
1326 | watchpoint. */ | |
1327 | static struct step_over_info step_over_info; | |
1328 | ||
1329 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1330 | stepping over. |
1331 | N.B. We record the aspace and address now, instead of say just the thread, | |
1332 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1333 | |
1334 | static void | |
8b86c959 | 1335 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1336 | int nonsteppable_watchpoint_p, |
1337 | int thread) | |
31e77af2 PA |
1338 | { |
1339 | step_over_info.aspace = aspace; | |
1340 | step_over_info.address = address; | |
963f9c80 | 1341 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1342 | step_over_info.thread = thread; |
31e77af2 PA |
1343 | } |
1344 | ||
1345 | /* Called when we're not longer stepping over a breakpoint / an | |
1346 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1347 | ||
1348 | static void | |
1349 | clear_step_over_info (void) | |
1350 | { | |
edbcda09 | 1351 | infrun_log_debug ("clearing step over info"); |
31e77af2 PA |
1352 | step_over_info.aspace = NULL; |
1353 | step_over_info.address = 0; | |
963f9c80 | 1354 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1355 | step_over_info.thread = -1; |
31e77af2 PA |
1356 | } |
1357 | ||
7f89fd65 | 1358 | /* See infrun.h. */ |
31e77af2 PA |
1359 | |
1360 | int | |
1361 | stepping_past_instruction_at (struct address_space *aspace, | |
1362 | CORE_ADDR address) | |
1363 | { | |
1364 | return (step_over_info.aspace != NULL | |
1365 | && breakpoint_address_match (aspace, address, | |
1366 | step_over_info.aspace, | |
1367 | step_over_info.address)); | |
1368 | } | |
1369 | ||
963f9c80 PA |
1370 | /* See infrun.h. */ |
1371 | ||
21edc42f YQ |
1372 | int |
1373 | thread_is_stepping_over_breakpoint (int thread) | |
1374 | { | |
1375 | return (step_over_info.thread != -1 | |
1376 | && thread == step_over_info.thread); | |
1377 | } | |
1378 | ||
1379 | /* See infrun.h. */ | |
1380 | ||
963f9c80 PA |
1381 | int |
1382 | stepping_past_nonsteppable_watchpoint (void) | |
1383 | { | |
1384 | return step_over_info.nonsteppable_watchpoint_p; | |
1385 | } | |
1386 | ||
6cc83d2a PA |
1387 | /* Returns true if step-over info is valid. */ |
1388 | ||
1389 | static int | |
1390 | step_over_info_valid_p (void) | |
1391 | { | |
963f9c80 PA |
1392 | return (step_over_info.aspace != NULL |
1393 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1394 | } |
1395 | ||
c906108c | 1396 | \f |
237fc4c9 PA |
1397 | /* Displaced stepping. */ |
1398 | ||
1399 | /* In non-stop debugging mode, we must take special care to manage | |
1400 | breakpoints properly; in particular, the traditional strategy for | |
1401 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1402 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1403 | breakpoint it has hit while ensuring that other threads running | |
1404 | concurrently will hit the breakpoint as they should. | |
1405 | ||
1406 | The traditional way to step a thread T off a breakpoint in a | |
1407 | multi-threaded program in all-stop mode is as follows: | |
1408 | ||
1409 | a0) Initially, all threads are stopped, and breakpoints are not | |
1410 | inserted. | |
1411 | a1) We single-step T, leaving breakpoints uninserted. | |
1412 | a2) We insert breakpoints, and resume all threads. | |
1413 | ||
1414 | In non-stop debugging, however, this strategy is unsuitable: we | |
1415 | don't want to have to stop all threads in the system in order to | |
1416 | continue or step T past a breakpoint. Instead, we use displaced | |
1417 | stepping: | |
1418 | ||
1419 | n0) Initially, T is stopped, other threads are running, and | |
1420 | breakpoints are inserted. | |
1421 | n1) We copy the instruction "under" the breakpoint to a separate | |
1422 | location, outside the main code stream, making any adjustments | |
1423 | to the instruction, register, and memory state as directed by | |
1424 | T's architecture. | |
1425 | n2) We single-step T over the instruction at its new location. | |
1426 | n3) We adjust the resulting register and memory state as directed | |
1427 | by T's architecture. This includes resetting T's PC to point | |
1428 | back into the main instruction stream. | |
1429 | n4) We resume T. | |
1430 | ||
1431 | This approach depends on the following gdbarch methods: | |
1432 | ||
1433 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1434 | indicate where to copy the instruction, and how much space must | |
1435 | be reserved there. We use these in step n1. | |
1436 | ||
1437 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1438 | address, and makes any necessary adjustments to the instruction, | |
1439 | register contents, and memory. We use this in step n1. | |
1440 | ||
1441 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1442 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1443 | same effect the instruction would have had if we had executed it |
1444 | at its original address. We use this in step n3. | |
1445 | ||
237fc4c9 PA |
1446 | The gdbarch_displaced_step_copy_insn and |
1447 | gdbarch_displaced_step_fixup functions must be written so that | |
1448 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1449 | single-stepping across the copied instruction, and then applying | |
1450 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1451 | thread's memory and registers as stepping the instruction in place | |
1452 | would have. Exactly which responsibilities fall to the copy and | |
1453 | which fall to the fixup is up to the author of those functions. | |
1454 | ||
1455 | See the comments in gdbarch.sh for details. | |
1456 | ||
1457 | Note that displaced stepping and software single-step cannot | |
1458 | currently be used in combination, although with some care I think | |
1459 | they could be made to. Software single-step works by placing | |
1460 | breakpoints on all possible subsequent instructions; if the | |
1461 | displaced instruction is a PC-relative jump, those breakpoints | |
1462 | could fall in very strange places --- on pages that aren't | |
1463 | executable, or at addresses that are not proper instruction | |
1464 | boundaries. (We do generally let other threads run while we wait | |
1465 | to hit the software single-step breakpoint, and they might | |
1466 | encounter such a corrupted instruction.) One way to work around | |
1467 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1468 | simulate the effect of PC-relative instructions (and return NULL) | |
1469 | on architectures that use software single-stepping. | |
1470 | ||
1471 | In non-stop mode, we can have independent and simultaneous step | |
1472 | requests, so more than one thread may need to simultaneously step | |
1473 | over a breakpoint. The current implementation assumes there is | |
1474 | only one scratch space per process. In this case, we have to | |
1475 | serialize access to the scratch space. If thread A wants to step | |
1476 | over a breakpoint, but we are currently waiting for some other | |
1477 | thread to complete a displaced step, we leave thread A stopped and | |
1478 | place it in the displaced_step_request_queue. Whenever a displaced | |
1479 | step finishes, we pick the next thread in the queue and start a new | |
1480 | displaced step operation on it. See displaced_step_prepare and | |
1481 | displaced_step_fixup for details. */ | |
1482 | ||
9844051a | 1483 | /* Get the displaced stepping state of inferior INF. */ |
fc1cf338 | 1484 | |
39a36629 | 1485 | static displaced_step_inferior_state * |
00431a78 | 1486 | get_displaced_stepping_state (inferior *inf) |
fc1cf338 | 1487 | { |
d20172fc | 1488 | return &inf->displaced_step_state; |
fc1cf338 PA |
1489 | } |
1490 | ||
9844051a | 1491 | /* Get the displaced stepping state of thread THREAD. */ |
372316f1 | 1492 | |
9844051a SM |
1493 | static displaced_step_thread_state * |
1494 | get_displaced_stepping_state (thread_info *thread) | |
372316f1 | 1495 | { |
9844051a | 1496 | return &thread->displaced_step_state; |
372316f1 PA |
1497 | } |
1498 | ||
9844051a | 1499 | /* Return true if the given thread is doing a displaced step. */ |
c0987663 | 1500 | |
9844051a SM |
1501 | static bool |
1502 | displaced_step_in_progress (thread_info *thread) | |
c0987663 | 1503 | { |
00431a78 | 1504 | gdb_assert (thread != NULL); |
c0987663 | 1505 | |
9844051a | 1506 | return get_displaced_stepping_state (thread)->in_progress (); |
c0987663 YQ |
1507 | } |
1508 | ||
9844051a | 1509 | /* Return true if any thread of this inferior is doing a displaced step. */ |
8f572e5c | 1510 | |
9844051a | 1511 | static bool |
00431a78 | 1512 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1513 | { |
9844051a SM |
1514 | for (thread_info *thread : inf->non_exited_threads ()) |
1515 | { | |
1516 | if (displaced_step_in_progress (thread)) | |
1517 | return true; | |
1518 | } | |
1519 | ||
1520 | return false; | |
1521 | } | |
1522 | ||
1523 | /* Return true if any thread is doing a displaced step. */ | |
1524 | ||
1525 | static bool | |
1526 | displaced_step_in_progress_any_thread () | |
1527 | { | |
1528 | for (thread_info *thread : all_non_exited_threads ()) | |
1529 | { | |
1530 | if (displaced_step_in_progress (thread)) | |
1531 | return true; | |
1532 | } | |
1533 | ||
1534 | return false; | |
fc1cf338 PA |
1535 | } |
1536 | ||
a42244db | 1537 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
7ccba087 | 1538 | of copy area, return corresponding displaced_step_copy_insn_closure. Otherwise, |
a42244db YQ |
1539 | return NULL. */ |
1540 | ||
7ccba087 SM |
1541 | struct displaced_step_copy_insn_closure * |
1542 | get_displaced_step_copy_insn_closure_by_addr (CORE_ADDR addr) | |
a42244db | 1543 | { |
9844051a SM |
1544 | // FIXME: implement me (only needed on ARM). |
1545 | // displaced_step_inferior_state *displaced | |
1546 | // = get_displaced_stepping_state (current_inferior ()); | |
1547 | // | |
1548 | // /* If checking the mode of displaced instruction in copy area. */ | |
1549 | // if (displaced->step_thread != nullptr | |
1550 | // && displaced->step_copy == addr) | |
1551 | // return displaced->step_closure.get (); | |
1552 | // | |
a42244db YQ |
1553 | return NULL; |
1554 | } | |
1555 | ||
fc1cf338 PA |
1556 | static void |
1557 | infrun_inferior_exit (struct inferior *inf) | |
1558 | { | |
d20172fc | 1559 | inf->displaced_step_state.reset (); |
fc1cf338 | 1560 | } |
237fc4c9 | 1561 | |
fff08868 HZ |
1562 | /* If ON, and the architecture supports it, GDB will use displaced |
1563 | stepping to step over breakpoints. If OFF, or if the architecture | |
1564 | doesn't support it, GDB will instead use the traditional | |
1565 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1566 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1567 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1568 | |
72d0e2c5 | 1569 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1570 | |
237fc4c9 PA |
1571 | static void |
1572 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1573 | struct cmd_list_element *c, | |
1574 | const char *value) | |
1575 | { | |
72d0e2c5 | 1576 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1577 | fprintf_filtered (file, |
1578 | _("Debugger's willingness to use displaced stepping " | |
1579 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1580 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1581 | else |
3e43a32a MS |
1582 | fprintf_filtered (file, |
1583 | _("Debugger's willingness to use displaced stepping " | |
1584 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1585 | } |
1586 | ||
9822cb57 SM |
1587 | /* Return true if the gdbarch implements the required methods to use |
1588 | displaced stepping. */ | |
1589 | ||
1590 | static bool | |
1591 | gdbarch_supports_displaced_stepping (gdbarch *arch) | |
1592 | { | |
9844051a SM |
1593 | /* Only check for the presence of copy_insn. Other required methods |
1594 | are checked by the gdbarch validation to be provided if copy_insn is | |
1595 | provided. */ | |
9822cb57 SM |
1596 | return gdbarch_displaced_step_copy_insn_p (arch); |
1597 | } | |
1598 | ||
fff08868 | 1599 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1600 | over breakpoints of thread TP. */ |
fff08868 | 1601 | |
9822cb57 SM |
1602 | static bool |
1603 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1604 | { |
9822cb57 SM |
1605 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1606 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1607 | return false; | |
1608 | ||
1609 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1610 | way. */ | |
1611 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1612 | && !target_is_non_stop_p ()) | |
1613 | return false; | |
1614 | ||
1615 | gdbarch *gdbarch = get_thread_regcache (tp)->arch (); | |
1616 | ||
1617 | /* If the architecture doesn't implement displaced stepping, don't use | |
1618 | it. */ | |
1619 | if (!gdbarch_supports_displaced_stepping (gdbarch)) | |
1620 | return false; | |
1621 | ||
1622 | /* If recording, don't use displaced stepping. */ | |
1623 | if (find_record_target () != nullptr) | |
1624 | return false; | |
1625 | ||
d20172fc SM |
1626 | displaced_step_inferior_state *displaced_state |
1627 | = get_displaced_stepping_state (tp->inf); | |
3fc8eb30 | 1628 | |
9822cb57 SM |
1629 | /* If displaced stepping failed before for this inferior, don't bother trying |
1630 | again. */ | |
1631 | if (displaced_state->failed_before) | |
1632 | return false; | |
1633 | ||
1634 | return true; | |
237fc4c9 PA |
1635 | } |
1636 | ||
9844051a | 1637 | /* Simple function wrapper around displaced_step_thread_state::reset. */ |
d8d83535 | 1638 | |
237fc4c9 | 1639 | static void |
9844051a | 1640 | displaced_step_reset (displaced_step_thread_state *displaced) |
237fc4c9 | 1641 | { |
d8d83535 | 1642 | displaced->reset (); |
237fc4c9 PA |
1643 | } |
1644 | ||
d8d83535 SM |
1645 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1646 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1647 | ||
1648 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 PA |
1649 | |
1650 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1651 | void | |
1652 | displaced_step_dump_bytes (struct ui_file *file, | |
1653 | const gdb_byte *buf, | |
1654 | size_t len) | |
1655 | { | |
1656 | int i; | |
1657 | ||
1658 | for (i = 0; i < len; i++) | |
1659 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1660 | fputs_unfiltered ("\n", file); | |
1661 | } | |
1662 | ||
1663 | /* Prepare to single-step, using displaced stepping. | |
1664 | ||
1665 | Note that we cannot use displaced stepping when we have a signal to | |
1666 | deliver. If we have a signal to deliver and an instruction to step | |
1667 | over, then after the step, there will be no indication from the | |
1668 | target whether the thread entered a signal handler or ignored the | |
1669 | signal and stepped over the instruction successfully --- both cases | |
1670 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1671 | fixup, and in the second case we must --- but we can't tell which. | |
1672 | Comments in the code for 'random signals' in handle_inferior_event | |
1673 | explain how we handle this case instead. | |
1674 | ||
1675 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1676 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1677 | if this instruction can't be displaced stepped. */ | |
1678 | ||
9844051a | 1679 | static displaced_step_prepare_status |
00431a78 | 1680 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1681 | { |
00431a78 | 1682 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1683 | struct gdbarch *gdbarch = regcache->arch (); |
9844051a SM |
1684 | displaced_step_thread_state *thread_disp_step_state |
1685 | = get_displaced_stepping_state (tp); | |
237fc4c9 PA |
1686 | |
1687 | /* We should never reach this function if the architecture does not | |
1688 | support displaced stepping. */ | |
9822cb57 | 1689 | gdb_assert (gdbarch_supports_displaced_stepping (gdbarch)); |
237fc4c9 | 1690 | |
c2829269 PA |
1691 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1692 | gdb_assert (tp->control.trap_expected); | |
1693 | ||
c1e36e3e PA |
1694 | /* Disable range stepping while executing in the scratch pad. We |
1695 | want a single-step even if executing the displaced instruction in | |
1696 | the scratch buffer lands within the stepping range (e.g., a | |
1697 | jump/branch). */ | |
1698 | tp->control.may_range_step = 0; | |
1699 | ||
9844051a SM |
1700 | /* We are about to start a displaced step for this thread, if one is already |
1701 | in progress, we goofed up somewhere. */ | |
1702 | gdb_assert (!thread_disp_step_state->in_progress ()); | |
237fc4c9 | 1703 | |
9844051a | 1704 | scoped_restore_current_thread restore_thread; |
fc1cf338 | 1705 | |
9844051a SM |
1706 | switch_to_thread (tp); |
1707 | ||
1708 | CORE_ADDR original_pc = regcache_read_pc (regcache); | |
1709 | ||
1710 | displaced_step_prepare_status status = | |
1711 | gdbarch_displaced_step_prepare (gdbarch, tp); | |
237fc4c9 | 1712 | |
9844051a SM |
1713 | if (status == DISPLACED_STEP_PREPARE_STATUS_ERROR) |
1714 | { | |
237fc4c9 PA |
1715 | if (debug_displaced) |
1716 | fprintf_unfiltered (gdb_stdlog, | |
9844051a | 1717 | "displaced: failed to prepare (%s)", |
a068643d | 1718 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 | 1719 | |
9844051a | 1720 | return DISPLACED_STEP_PREPARE_STATUS_ERROR; |
237fc4c9 | 1721 | } |
9844051a | 1722 | else if (status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
237fc4c9 | 1723 | { |
9844051a SM |
1724 | /* Not enough displaced stepping resources available, defer this |
1725 | request by placing it the queue. */ | |
1726 | ||
237fc4c9 PA |
1727 | if (debug_displaced) |
1728 | fprintf_unfiltered (gdb_stdlog, | |
9844051a SM |
1729 | "displaced: not enough resources available, " |
1730 | "deferring step of %s\n", | |
a068643d | 1731 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 | 1732 | |
9844051a | 1733 | global_thread_step_over_chain_enqueue (tp); |
effb9843 | 1734 | tp->inf->displaced_step_state.unavailable = true; |
d35ae833 | 1735 | |
9844051a | 1736 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; |
d35ae833 PA |
1737 | } |
1738 | ||
9844051a SM |
1739 | gdb_assert (status == DISPLACED_STEP_PREPARE_STATUS_OK); |
1740 | ||
1741 | // FIXME: Should probably replicated in the arch implementation now. | |
1742 | // | |
1743 | // if (breakpoint_in_range_p (aspace, copy, len)) | |
1744 | // { | |
1745 | // /* There's a breakpoint set in the scratch pad location range | |
1746 | // (which is usually around the entry point). We'd either | |
1747 | // install it before resuming, which would overwrite/corrupt the | |
1748 | // scratch pad, or if it was already inserted, this displaced | |
1749 | // step would overwrite it. The latter is OK in the sense that | |
1750 | // we already assume that no thread is going to execute the code | |
1751 | // in the scratch pad range (after initial startup) anyway, but | |
1752 | // the former is unacceptable. Simply punt and fallback to | |
1753 | // stepping over this breakpoint in-line. */ | |
1754 | // if (debug_displaced) | |
1755 | // { | |
1756 | // fprintf_unfiltered (gdb_stdlog, | |
1757 | // "displaced: breakpoint set in scratch pad. " | |
1758 | // "Stepping over breakpoint in-line instead.\n"); | |
1759 | // } | |
1760 | // | |
1761 | // gdb_assert (false); | |
1762 | // gdbarch_displaced_step_release_location (gdbarch, copy); | |
1763 | // | |
1764 | // return -1; | |
1765 | // } | |
237fc4c9 | 1766 | |
9f5a595d UW |
1767 | /* Save the information we need to fix things up if the step |
1768 | succeeds. */ | |
9844051a | 1769 | thread_disp_step_state->set (gdbarch); |
9f5a595d | 1770 | |
9844051a SM |
1771 | // FIXME: get it from _prepare? |
1772 | CORE_ADDR displaced_pc = 0; | |
ad53cd71 | 1773 | |
237fc4c9 | 1774 | if (debug_displaced) |
9844051a SM |
1775 | fprintf_unfiltered (gdb_stdlog, |
1776 | "displaced: prepared successfully thread=%s, " | |
1777 | "original_pc=%s, displaced_pc=%s\n", | |
1778 | target_pid_to_str (tp->ptid).c_str (), | |
1779 | paddress (gdbarch, original_pc), | |
1780 | paddress (gdbarch, displaced_pc)); | |
1781 | ||
1782 | return DISPLACED_STEP_PREPARE_STATUS_OK; | |
237fc4c9 PA |
1783 | } |
1784 | ||
3fc8eb30 PA |
1785 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1786 | attempts at displaced stepping if we get a memory error. */ | |
1787 | ||
9844051a | 1788 | static displaced_step_prepare_status |
00431a78 | 1789 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 | 1790 | { |
9844051a SM |
1791 | displaced_step_prepare_status status |
1792 | = DISPLACED_STEP_PREPARE_STATUS_ERROR; | |
3fc8eb30 | 1793 | |
a70b8144 | 1794 | try |
3fc8eb30 | 1795 | { |
9844051a | 1796 | status = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1797 | } |
230d2906 | 1798 | catch (const gdb_exception_error &ex) |
3fc8eb30 PA |
1799 | { |
1800 | struct displaced_step_inferior_state *displaced_state; | |
1801 | ||
16b41842 PA |
1802 | if (ex.error != MEMORY_ERROR |
1803 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1804 | throw; |
3fc8eb30 | 1805 | |
edbcda09 SM |
1806 | infrun_log_debug ("caught exception, disabling displaced stepping: %s", |
1807 | ex.what ()); | |
3fc8eb30 PA |
1808 | |
1809 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1810 | "auto". */ | |
1811 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1812 | { | |
fd7dcb94 | 1813 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1814 | ex.what ()); |
3fc8eb30 PA |
1815 | } |
1816 | ||
1817 | /* Disable further displaced stepping attempts. */ | |
1818 | displaced_state | |
00431a78 | 1819 | = get_displaced_stepping_state (thread->inf); |
3fc8eb30 PA |
1820 | displaced_state->failed_before = 1; |
1821 | } | |
3fc8eb30 | 1822 | |
9844051a | 1823 | return status; |
e2d96639 YQ |
1824 | } |
1825 | ||
372316f1 PA |
1826 | /* If we displaced stepped an instruction successfully, adjust |
1827 | registers and memory to yield the same effect the instruction would | |
1828 | have had if we had executed it at its original address, and return | |
1829 | 1. If the instruction didn't complete, relocate the PC and return | |
1830 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1831 | ||
1832 | static int | |
9844051a | 1833 | displaced_step_finish (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1834 | { |
9844051a SM |
1835 | displaced_step_thread_state *displaced |
1836 | = get_displaced_stepping_state (event_thread); | |
fc1cf338 | 1837 | |
9844051a SM |
1838 | /* Was this thread performing a displaced step? */ |
1839 | if (!displaced->in_progress ()) | |
372316f1 | 1840 | return 0; |
237fc4c9 | 1841 | |
9844051a SM |
1842 | displaced_step_reset_cleanup cleanup (displaced); |
1843 | ||
cb71640d PA |
1844 | /* Fixup may need to read memory/registers. Switch to the thread |
1845 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
d43b7a2d TBA |
1846 | the current thread, and displaced_step_restore performs ptid-dependent |
1847 | memory accesses using current_inferior() and current_top_target(). */ | |
00431a78 | 1848 | switch_to_thread (event_thread); |
cb71640d | 1849 | |
9844051a SM |
1850 | /* Do the fixup, and release the resources acquired to do the displaced |
1851 | step. */ | |
1852 | displaced_step_finish_status finish_status = | |
1853 | gdbarch_displaced_step_finish (displaced->get_original_gdbarch (), | |
1854 | event_thread, signal); | |
d43b7a2d | 1855 | |
9844051a SM |
1856 | if (finish_status == DISPLACED_STEP_FINISH_STATUS_OK) |
1857 | return 1; | |
237fc4c9 | 1858 | else |
9844051a | 1859 | return -1; |
c2829269 | 1860 | } |
1c5cfe86 | 1861 | |
4d9d9d04 PA |
1862 | /* Data to be passed around while handling an event. This data is |
1863 | discarded between events. */ | |
1864 | struct execution_control_state | |
1865 | { | |
5b6d1e4f | 1866 | process_stratum_target *target; |
4d9d9d04 PA |
1867 | ptid_t ptid; |
1868 | /* The thread that got the event, if this was a thread event; NULL | |
1869 | otherwise. */ | |
1870 | struct thread_info *event_thread; | |
1871 | ||
1872 | struct target_waitstatus ws; | |
1873 | int stop_func_filled_in; | |
1874 | CORE_ADDR stop_func_start; | |
1875 | CORE_ADDR stop_func_end; | |
1876 | const char *stop_func_name; | |
1877 | int wait_some_more; | |
1878 | ||
1879 | /* True if the event thread hit the single-step breakpoint of | |
1880 | another thread. Thus the event doesn't cause a stop, the thread | |
1881 | needs to be single-stepped past the single-step breakpoint before | |
1882 | we can switch back to the original stepping thread. */ | |
1883 | int hit_singlestep_breakpoint; | |
1884 | }; | |
1885 | ||
1886 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1887 | |
1888 | static void | |
4d9d9d04 PA |
1889 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1890 | { | |
1891 | memset (ecs, 0, sizeof (*ecs)); | |
1892 | ecs->event_thread = tp; | |
1893 | ecs->ptid = tp->ptid; | |
1894 | } | |
1895 | ||
1896 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1897 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 1898 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1899 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1900 | |
1901 | /* Are there any pending step-over requests? If so, run all we can | |
1902 | now and return true. Otherwise, return false. */ | |
1903 | ||
1904 | static int | |
c2829269 PA |
1905 | start_step_over (void) |
1906 | { | |
1907 | struct thread_info *tp, *next; | |
9844051a | 1908 | int started = 0; |
c2829269 | 1909 | |
372316f1 PA |
1910 | /* Don't start a new step-over if we already have an in-line |
1911 | step-over operation ongoing. */ | |
1912 | if (step_over_info_valid_p ()) | |
9844051a SM |
1913 | return started; |
1914 | ||
1915 | /* Steal the global thread step over chain. */ | |
1916 | thread_info *threads_to_step = global_thread_step_over_chain_head; | |
1917 | global_thread_step_over_chain_head = NULL; | |
1918 | ||
1919 | if (debug_infrun) | |
1920 | fprintf_unfiltered (gdb_stdlog, | |
1921 | "infrun: stealing list of %d threads to step from global queue\n", | |
1922 | thread_step_over_chain_length (threads_to_step)); | |
372316f1 | 1923 | |
effb9843 SM |
1924 | for (inferior *inf : all_inferiors ()) |
1925 | inf->displaced_step_state.unavailable = false; | |
1926 | ||
9844051a | 1927 | for (tp = threads_to_step; tp != NULL; tp = next) |
237fc4c9 | 1928 | { |
4d9d9d04 PA |
1929 | struct execution_control_state ecss; |
1930 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1931 | step_over_what step_what; |
372316f1 | 1932 | int must_be_in_line; |
c2829269 | 1933 | |
c65d6b55 PA |
1934 | gdb_assert (!tp->stop_requested); |
1935 | ||
9844051a | 1936 | next = thread_step_over_chain_next (threads_to_step, tp); |
c2829269 | 1937 | |
372316f1 PA |
1938 | step_what = thread_still_needs_step_over (tp); |
1939 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1940 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1941 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1942 | |
1943 | /* We currently stop all threads of all processes to step-over | |
1944 | in-line. If we need to start a new in-line step-over, let | |
1945 | any pending displaced steps finish first. */ | |
9844051a SM |
1946 | if (must_be_in_line && displaced_step_in_progress_any_thread ()) |
1947 | continue; | |
c2829269 | 1948 | |
9844051a | 1949 | thread_step_over_chain_remove (&threads_to_step, tp); |
c2829269 | 1950 | |
372316f1 PA |
1951 | if (tp->control.trap_expected |
1952 | || tp->resumed | |
1953 | || tp->executing) | |
ad53cd71 | 1954 | { |
4d9d9d04 PA |
1955 | internal_error (__FILE__, __LINE__, |
1956 | "[%s] has inconsistent state: " | |
372316f1 | 1957 | "trap_expected=%d, resumed=%d, executing=%d\n", |
a068643d | 1958 | target_pid_to_str (tp->ptid).c_str (), |
4d9d9d04 | 1959 | tp->control.trap_expected, |
372316f1 | 1960 | tp->resumed, |
4d9d9d04 | 1961 | tp->executing); |
ad53cd71 | 1962 | } |
1c5cfe86 | 1963 | |
edbcda09 SM |
1964 | infrun_log_debug ("resuming [%s] for step-over", |
1965 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 PA |
1966 | |
1967 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
1968 | is no longer inserted. In all-stop, we want to keep looking | |
1969 | for a thread that needs a step-over instead of resuming TP, | |
1970 | because we wouldn't be able to resume anything else until the | |
1971 | target stops again. In non-stop, the resume always resumes | |
1972 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 1973 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 1974 | continue; |
8550d3b3 | 1975 | |
effb9843 SM |
1976 | if (tp->inf->displaced_step_state.unavailable) |
1977 | { | |
1978 | global_thread_step_over_chain_enqueue (tp); | |
1979 | continue; | |
1980 | } | |
1981 | ||
00431a78 | 1982 | switch_to_thread (tp); |
4d9d9d04 PA |
1983 | reset_ecs (ecs, tp); |
1984 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 1985 | |
4d9d9d04 PA |
1986 | if (!ecs->wait_some_more) |
1987 | error (_("Command aborted.")); | |
1c5cfe86 | 1988 | |
9844051a SM |
1989 | /* If the thread's step over could not be initiated, it was re-added |
1990 | to the global step over chain. */ | |
1991 | if (tp->resumed) | |
1992 | { | |
1993 | infrun_log_debug ("start_step_over: [%s] was resumed.\n", | |
1994 | target_pid_to_str (tp->ptid).c_str ()); | |
1995 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
1996 | } | |
1997 | else | |
1998 | { | |
1999 | infrun_log_debug ("infrun: start_step_over: [%s] was NOT resumed.\n", | |
2000 | target_pid_to_str (tp->ptid).c_str ()); | |
2001 | gdb_assert (thread_is_in_step_over_chain (tp)); | |
2002 | ||
2003 | } | |
372316f1 PA |
2004 | |
2005 | /* If we started a new in-line step-over, we're done. */ | |
2006 | if (step_over_info_valid_p ()) | |
2007 | { | |
2008 | gdb_assert (tp->control.trap_expected); | |
9844051a SM |
2009 | started = 1; |
2010 | break; | |
372316f1 PA |
2011 | } |
2012 | ||
fbea99ea | 2013 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2014 | { |
2015 | /* On all-stop, shouldn't have resumed unless we needed a | |
2016 | step over. */ | |
2017 | gdb_assert (tp->control.trap_expected | |
2018 | || tp->step_after_step_resume_breakpoint); | |
2019 | ||
2020 | /* With remote targets (at least), in all-stop, we can't | |
2021 | issue any further remote commands until the program stops | |
2022 | again. */ | |
9844051a SM |
2023 | started = 1; |
2024 | break; | |
1c5cfe86 | 2025 | } |
c2829269 | 2026 | |
4d9d9d04 PA |
2027 | /* Either the thread no longer needed a step-over, or a new |
2028 | displaced stepping sequence started. Even in the latter | |
2029 | case, continue looking. Maybe we can also start another | |
2030 | displaced step on a thread of other process. */ | |
237fc4c9 | 2031 | } |
4d9d9d04 | 2032 | |
9844051a SM |
2033 | /* If there are threads left in the THREADS_TO_STEP list, but we have |
2034 | detected that we can't start anything more, put back these threads | |
2035 | in the global list. */ | |
2036 | if (threads_to_step == NULL) | |
2037 | { | |
2038 | if (debug_infrun) | |
2039 | fprintf_unfiltered (gdb_stdlog, | |
2040 | "infrun: step-over queue now empty\n"); | |
2041 | } | |
2042 | else | |
2043 | { | |
2044 | if (debug_infrun) | |
2045 | fprintf_unfiltered (gdb_stdlog, | |
2046 | "infrun: putting back %d threads to step in global queue\n", | |
2047 | thread_step_over_chain_length (threads_to_step)); | |
2048 | while (threads_to_step != nullptr) | |
2049 | { | |
2050 | thread_info *thread = threads_to_step; | |
2051 | ||
2052 | /* Remove from that list. */ | |
2053 | thread_step_over_chain_remove (&threads_to_step, thread); | |
2054 | ||
2055 | /* Add to global list. */ | |
2056 | global_thread_step_over_chain_enqueue (thread); | |
2057 | ||
2058 | } | |
2059 | } | |
2060 | ||
2061 | return started; | |
237fc4c9 PA |
2062 | } |
2063 | ||
5231c1fd PA |
2064 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2065 | holding OLD_PTID. */ | |
2066 | static void | |
2067 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2068 | { | |
d7e15655 | 2069 | if (inferior_ptid == old_ptid) |
5231c1fd | 2070 | inferior_ptid = new_ptid; |
5231c1fd PA |
2071 | } |
2072 | ||
237fc4c9 | 2073 | \f |
c906108c | 2074 | |
53904c9e AC |
2075 | static const char schedlock_off[] = "off"; |
2076 | static const char schedlock_on[] = "on"; | |
2077 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2078 | static const char schedlock_replay[] = "replay"; |
40478521 | 2079 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2080 | schedlock_off, |
2081 | schedlock_on, | |
2082 | schedlock_step, | |
f2665db5 | 2083 | schedlock_replay, |
ef346e04 AC |
2084 | NULL |
2085 | }; | |
f2665db5 | 2086 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2087 | static void |
2088 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2089 | struct cmd_list_element *c, const char *value) | |
2090 | { | |
3e43a32a MS |
2091 | fprintf_filtered (file, |
2092 | _("Mode for locking scheduler " | |
2093 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2094 | value); |
2095 | } | |
c906108c SS |
2096 | |
2097 | static void | |
eb4c3f4a | 2098 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2099 | { |
eefe576e AC |
2100 | if (!target_can_lock_scheduler) |
2101 | { | |
2102 | scheduler_mode = schedlock_off; | |
2103 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2104 | } | |
c906108c SS |
2105 | } |
2106 | ||
d4db2f36 PA |
2107 | /* True if execution commands resume all threads of all processes by |
2108 | default; otherwise, resume only threads of the current inferior | |
2109 | process. */ | |
491144b5 | 2110 | bool sched_multi = false; |
d4db2f36 | 2111 | |
2facfe5c DD |
2112 | /* Try to setup for software single stepping over the specified location. |
2113 | Return 1 if target_resume() should use hardware single step. | |
2114 | ||
2115 | GDBARCH the current gdbarch. | |
2116 | PC the location to step over. */ | |
2117 | ||
2118 | static int | |
2119 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2120 | { | |
2121 | int hw_step = 1; | |
2122 | ||
f02253f1 | 2123 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2124 | && gdbarch_software_single_step_p (gdbarch)) |
2125 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2126 | ||
2facfe5c DD |
2127 | return hw_step; |
2128 | } | |
c906108c | 2129 | |
f3263aa4 PA |
2130 | /* See infrun.h. */ |
2131 | ||
09cee04b PA |
2132 | ptid_t |
2133 | user_visible_resume_ptid (int step) | |
2134 | { | |
f3263aa4 | 2135 | ptid_t resume_ptid; |
09cee04b | 2136 | |
09cee04b PA |
2137 | if (non_stop) |
2138 | { | |
2139 | /* With non-stop mode on, threads are always handled | |
2140 | individually. */ | |
2141 | resume_ptid = inferior_ptid; | |
2142 | } | |
2143 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2144 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2145 | { |
f3263aa4 PA |
2146 | /* User-settable 'scheduler' mode requires solo thread |
2147 | resume. */ | |
09cee04b PA |
2148 | resume_ptid = inferior_ptid; |
2149 | } | |
f2665db5 MM |
2150 | else if ((scheduler_mode == schedlock_replay) |
2151 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2152 | { | |
2153 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2154 | mode. */ | |
2155 | resume_ptid = inferior_ptid; | |
2156 | } | |
f3263aa4 PA |
2157 | else if (!sched_multi && target_supports_multi_process ()) |
2158 | { | |
2159 | /* Resume all threads of the current process (and none of other | |
2160 | processes). */ | |
e99b03dc | 2161 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2162 | } |
2163 | else | |
2164 | { | |
2165 | /* Resume all threads of all processes. */ | |
2166 | resume_ptid = RESUME_ALL; | |
2167 | } | |
09cee04b PA |
2168 | |
2169 | return resume_ptid; | |
2170 | } | |
2171 | ||
5b6d1e4f PA |
2172 | /* See infrun.h. */ |
2173 | ||
2174 | process_stratum_target * | |
2175 | user_visible_resume_target (ptid_t resume_ptid) | |
2176 | { | |
2177 | return (resume_ptid == minus_one_ptid && sched_multi | |
2178 | ? NULL | |
2179 | : current_inferior ()->process_target ()); | |
2180 | } | |
2181 | ||
fbea99ea PA |
2182 | /* Return a ptid representing the set of threads that we will resume, |
2183 | in the perspective of the target, assuming run control handling | |
2184 | does not require leaving some threads stopped (e.g., stepping past | |
2185 | breakpoint). USER_STEP indicates whether we're about to start the | |
2186 | target for a stepping command. */ | |
2187 | ||
2188 | static ptid_t | |
2189 | internal_resume_ptid (int user_step) | |
2190 | { | |
2191 | /* In non-stop, we always control threads individually. Note that | |
2192 | the target may always work in non-stop mode even with "set | |
2193 | non-stop off", in which case user_visible_resume_ptid could | |
2194 | return a wildcard ptid. */ | |
2195 | if (target_is_non_stop_p ()) | |
2196 | return inferior_ptid; | |
2197 | else | |
2198 | return user_visible_resume_ptid (user_step); | |
2199 | } | |
2200 | ||
64ce06e4 PA |
2201 | /* Wrapper for target_resume, that handles infrun-specific |
2202 | bookkeeping. */ | |
2203 | ||
2204 | static void | |
2205 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2206 | { | |
2207 | struct thread_info *tp = inferior_thread (); | |
2208 | ||
c65d6b55 PA |
2209 | gdb_assert (!tp->stop_requested); |
2210 | ||
64ce06e4 | 2211 | /* Install inferior's terminal modes. */ |
223ffa71 | 2212 | target_terminal::inferior (); |
64ce06e4 PA |
2213 | |
2214 | /* Avoid confusing the next resume, if the next stop/resume | |
2215 | happens to apply to another thread. */ | |
2216 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2217 | ||
8f572e5c PA |
2218 | /* Advise target which signals may be handled silently. |
2219 | ||
2220 | If we have removed breakpoints because we are stepping over one | |
2221 | in-line (in any thread), we need to receive all signals to avoid | |
2222 | accidentally skipping a breakpoint during execution of a signal | |
2223 | handler. | |
2224 | ||
2225 | Likewise if we're displaced stepping, otherwise a trap for a | |
2226 | breakpoint in a signal handler might be confused with the | |
2227 | displaced step finishing. We don't make the displaced_step_fixup | |
2228 | step distinguish the cases instead, because: | |
2229 | ||
2230 | - a backtrace while stopped in the signal handler would show the | |
2231 | scratch pad as frame older than the signal handler, instead of | |
2232 | the real mainline code. | |
2233 | ||
2234 | - when the thread is later resumed, the signal handler would | |
2235 | return to the scratch pad area, which would no longer be | |
2236 | valid. */ | |
2237 | if (step_over_info_valid_p () | |
00431a78 | 2238 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2239 | target_pass_signals ({}); |
64ce06e4 | 2240 | else |
adc6a863 | 2241 | target_pass_signals (signal_pass); |
64ce06e4 PA |
2242 | |
2243 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2244 | |
2245 | target_commit_resume (); | |
5b6d1e4f PA |
2246 | |
2247 | if (target_can_async_p ()) | |
2248 | target_async (1); | |
64ce06e4 PA |
2249 | } |
2250 | ||
d930703d | 2251 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2252 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2253 | call 'resume', which handles exceptions. */ | |
c906108c | 2254 | |
71d378ae PA |
2255 | static void |
2256 | resume_1 (enum gdb_signal sig) | |
c906108c | 2257 | { |
515630c5 | 2258 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2259 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2260 | struct thread_info *tp = inferior_thread (); |
8b86c959 | 2261 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2262 | ptid_t resume_ptid; |
856e7dd6 PA |
2263 | /* This represents the user's step vs continue request. When |
2264 | deciding whether "set scheduler-locking step" applies, it's the | |
2265 | user's intention that counts. */ | |
2266 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2267 | /* This represents what we'll actually request the target to do. |
2268 | This can decay from a step to a continue, if e.g., we need to | |
2269 | implement single-stepping with breakpoints (software | |
2270 | single-step). */ | |
6b403daa | 2271 | int step; |
c7e8a53c | 2272 | |
c65d6b55 | 2273 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2274 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2275 | ||
372316f1 PA |
2276 | if (tp->suspend.waitstatus_pending_p) |
2277 | { | |
edbcda09 SM |
2278 | infrun_log_debug |
2279 | ("thread %s has pending wait " | |
2280 | "status %s (currently_stepping=%d).", | |
2281 | target_pid_to_str (tp->ptid).c_str (), | |
2282 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2283 | currently_stepping (tp)); | |
372316f1 | 2284 | |
5b6d1e4f | 2285 | tp->inf->process_target ()->threads_executing = true; |
719546c4 | 2286 | tp->resumed = true; |
372316f1 PA |
2287 | |
2288 | /* FIXME: What should we do if we are supposed to resume this | |
2289 | thread with a signal? Maybe we should maintain a queue of | |
2290 | pending signals to deliver. */ | |
2291 | if (sig != GDB_SIGNAL_0) | |
2292 | { | |
fd7dcb94 | 2293 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d TT |
2294 | gdb_signal_to_name (sig), |
2295 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2296 | } |
2297 | ||
2298 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2299 | |
2300 | if (target_can_async_p ()) | |
9516f85a AB |
2301 | { |
2302 | target_async (1); | |
2303 | /* Tell the event loop we have an event to process. */ | |
2304 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2305 | } | |
372316f1 PA |
2306 | return; |
2307 | } | |
2308 | ||
2309 | tp->stepped_breakpoint = 0; | |
2310 | ||
6b403daa PA |
2311 | /* Depends on stepped_breakpoint. */ |
2312 | step = currently_stepping (tp); | |
2313 | ||
74609e71 YQ |
2314 | if (current_inferior ()->waiting_for_vfork_done) |
2315 | { | |
48f9886d PA |
2316 | /* Don't try to single-step a vfork parent that is waiting for |
2317 | the child to get out of the shared memory region (by exec'ing | |
2318 | or exiting). This is particularly important on software | |
2319 | single-step archs, as the child process would trip on the | |
2320 | software single step breakpoint inserted for the parent | |
2321 | process. Since the parent will not actually execute any | |
2322 | instruction until the child is out of the shared region (such | |
2323 | are vfork's semantics), it is safe to simply continue it. | |
2324 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2325 | the parent, and tell it to `keep_going', which automatically | |
2326 | re-sets it stepping. */ | |
edbcda09 | 2327 | infrun_log_debug ("resume : clear step"); |
a09dd441 | 2328 | step = 0; |
74609e71 YQ |
2329 | } |
2330 | ||
7ca9b62a TBA |
2331 | CORE_ADDR pc = regcache_read_pc (regcache); |
2332 | ||
edbcda09 SM |
2333 | infrun_log_debug ("step=%d, signal=%s, trap_expected=%d, " |
2334 | "current thread [%s] at %s", | |
2335 | step, gdb_signal_to_symbol_string (sig), | |
2336 | tp->control.trap_expected, | |
2337 | target_pid_to_str (inferior_ptid).c_str (), | |
2338 | paddress (gdbarch, pc)); | |
c906108c | 2339 | |
c2c6d25f JM |
2340 | /* Normally, by the time we reach `resume', the breakpoints are either |
2341 | removed or inserted, as appropriate. The exception is if we're sitting | |
2342 | at a permanent breakpoint; we need to step over it, but permanent | |
2343 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2344 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2345 | { |
af48d08f PA |
2346 | if (sig != GDB_SIGNAL_0) |
2347 | { | |
2348 | /* We have a signal to pass to the inferior. The resume | |
2349 | may, or may not take us to the signal handler. If this | |
2350 | is a step, we'll need to stop in the signal handler, if | |
2351 | there's one, (if the target supports stepping into | |
2352 | handlers), or in the next mainline instruction, if | |
2353 | there's no handler. If this is a continue, we need to be | |
2354 | sure to run the handler with all breakpoints inserted. | |
2355 | In all cases, set a breakpoint at the current address | |
2356 | (where the handler returns to), and once that breakpoint | |
2357 | is hit, resume skipping the permanent breakpoint. If | |
2358 | that breakpoint isn't hit, then we've stepped into the | |
2359 | signal handler (or hit some other event). We'll delete | |
2360 | the step-resume breakpoint then. */ | |
2361 | ||
edbcda09 SM |
2362 | infrun_log_debug ("resume: skipping permanent breakpoint, " |
2363 | "deliver signal first"); | |
af48d08f PA |
2364 | |
2365 | clear_step_over_info (); | |
2366 | tp->control.trap_expected = 0; | |
2367 | ||
2368 | if (tp->control.step_resume_breakpoint == NULL) | |
2369 | { | |
2370 | /* Set a "high-priority" step-resume, as we don't want | |
2371 | user breakpoints at PC to trigger (again) when this | |
2372 | hits. */ | |
2373 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2374 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2375 | ||
2376 | tp->step_after_step_resume_breakpoint = step; | |
2377 | } | |
2378 | ||
2379 | insert_breakpoints (); | |
2380 | } | |
2381 | else | |
2382 | { | |
2383 | /* There's no signal to pass, we can go ahead and skip the | |
2384 | permanent breakpoint manually. */ | |
edbcda09 | 2385 | infrun_log_debug ("skipping permanent breakpoint"); |
af48d08f PA |
2386 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); |
2387 | /* Update pc to reflect the new address from which we will | |
2388 | execute instructions. */ | |
2389 | pc = regcache_read_pc (regcache); | |
2390 | ||
2391 | if (step) | |
2392 | { | |
2393 | /* We've already advanced the PC, so the stepping part | |
2394 | is done. Now we need to arrange for a trap to be | |
2395 | reported to handle_inferior_event. Set a breakpoint | |
2396 | at the current PC, and run to it. Don't update | |
2397 | prev_pc, because if we end in | |
44a1ee51 PA |
2398 | switch_back_to_stepped_thread, we want the "expected |
2399 | thread advanced also" branch to be taken. IOW, we | |
2400 | don't want this thread to step further from PC | |
af48d08f | 2401 | (overstep). */ |
1ac806b8 | 2402 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2403 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2404 | insert_breakpoints (); | |
2405 | ||
fbea99ea | 2406 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2407 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
719546c4 | 2408 | tp->resumed = true; |
af48d08f PA |
2409 | return; |
2410 | } | |
2411 | } | |
6d350bb5 | 2412 | } |
c2c6d25f | 2413 | |
c1e36e3e PA |
2414 | /* If we have a breakpoint to step over, make sure to do a single |
2415 | step only. Same if we have software watchpoints. */ | |
2416 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2417 | tp->control.may_range_step = 0; | |
2418 | ||
7da6a5b9 LM |
2419 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2420 | copy of the instruction at a different address. | |
237fc4c9 PA |
2421 | |
2422 | We can't use displaced stepping when we have a signal to deliver; | |
2423 | the comments for displaced_step_prepare explain why. The | |
2424 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2425 | signals' explain what we do instead. |
2426 | ||
2427 | We can't use displaced stepping when we are waiting for vfork_done | |
2428 | event, displaced stepping breaks the vfork child similarly as single | |
2429 | step software breakpoint. */ | |
3fc8eb30 PA |
2430 | if (tp->control.trap_expected |
2431 | && use_displaced_stepping (tp) | |
cb71640d | 2432 | && !step_over_info_valid_p () |
a493e3e2 | 2433 | && sig == GDB_SIGNAL_0 |
74609e71 | 2434 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2435 | { |
9844051a SM |
2436 | displaced_step_prepare_status prepare_status |
2437 | = displaced_step_prepare (tp); | |
fc1cf338 | 2438 | |
9844051a | 2439 | if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
d56b7306 | 2440 | { |
edbcda09 | 2441 | infrun_log_debug ("Got placed in step-over queue"); |
4d9d9d04 PA |
2442 | |
2443 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2444 | return; |
2445 | } | |
9844051a | 2446 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_ERROR) |
3fc8eb30 PA |
2447 | { |
2448 | /* Fallback to stepping over the breakpoint in-line. */ | |
2449 | ||
2450 | if (target_is_non_stop_p ()) | |
2451 | stop_all_threads (); | |
2452 | ||
a01bda52 | 2453 | set_step_over_info (regcache->aspace (), |
21edc42f | 2454 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2455 | |
2456 | step = maybe_software_singlestep (gdbarch, pc); | |
2457 | ||
2458 | insert_breakpoints (); | |
2459 | } | |
9844051a | 2460 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_OK) |
3fc8eb30 | 2461 | { |
9844051a | 2462 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, NULL); |
3fc8eb30 | 2463 | } |
9844051a SM |
2464 | else |
2465 | gdb_assert_not_reached ("invalid displaced_step_prepare_status value"); | |
237fc4c9 PA |
2466 | } |
2467 | ||
2facfe5c | 2468 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2469 | else if (step) |
2facfe5c | 2470 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2471 | |
30852783 UW |
2472 | /* Currently, our software single-step implementation leads to different |
2473 | results than hardware single-stepping in one situation: when stepping | |
2474 | into delivering a signal which has an associated signal handler, | |
2475 | hardware single-step will stop at the first instruction of the handler, | |
2476 | while software single-step will simply skip execution of the handler. | |
2477 | ||
2478 | For now, this difference in behavior is accepted since there is no | |
2479 | easy way to actually implement single-stepping into a signal handler | |
2480 | without kernel support. | |
2481 | ||
2482 | However, there is one scenario where this difference leads to follow-on | |
2483 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2484 | and then single-stepping. In this case, the software single-step | |
2485 | behavior means that even if there is a *breakpoint* in the signal | |
2486 | handler, GDB still would not stop. | |
2487 | ||
2488 | Fortunately, we can at least fix this particular issue. We detect | |
2489 | here the case where we are about to deliver a signal while software | |
2490 | single-stepping with breakpoints removed. In this situation, we | |
2491 | revert the decisions to remove all breakpoints and insert single- | |
2492 | step breakpoints, and instead we install a step-resume breakpoint | |
2493 | at the current address, deliver the signal without stepping, and | |
2494 | once we arrive back at the step-resume breakpoint, actually step | |
2495 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2496 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2497 | && sig != GDB_SIGNAL_0 |
2498 | && step_over_info_valid_p ()) | |
30852783 UW |
2499 | { |
2500 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2501 | immediately after a handler returns, might already have |
30852783 UW |
2502 | a step-resume breakpoint set on the earlier handler. We cannot |
2503 | set another step-resume breakpoint; just continue on until the | |
2504 | original breakpoint is hit. */ | |
2505 | if (tp->control.step_resume_breakpoint == NULL) | |
2506 | { | |
2c03e5be | 2507 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2508 | tp->step_after_step_resume_breakpoint = 1; |
2509 | } | |
2510 | ||
34b7e8a6 | 2511 | delete_single_step_breakpoints (tp); |
30852783 | 2512 | |
31e77af2 | 2513 | clear_step_over_info (); |
30852783 | 2514 | tp->control.trap_expected = 0; |
31e77af2 PA |
2515 | |
2516 | insert_breakpoints (); | |
30852783 UW |
2517 | } |
2518 | ||
b0f16a3e SM |
2519 | /* If STEP is set, it's a request to use hardware stepping |
2520 | facilities. But in that case, we should never | |
2521 | use singlestep breakpoint. */ | |
34b7e8a6 | 2522 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2523 | |
fbea99ea | 2524 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2525 | if (tp->control.trap_expected) |
b0f16a3e SM |
2526 | { |
2527 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2528 | hit, either by single-stepping the thread with the breakpoint |
2529 | removed, or by displaced stepping, with the breakpoint inserted. | |
2530 | In the former case, we need to single-step only this thread, | |
2531 | and keep others stopped, as they can miss this breakpoint if | |
2532 | allowed to run. That's not really a problem for displaced | |
2533 | stepping, but, we still keep other threads stopped, in case | |
2534 | another thread is also stopped for a breakpoint waiting for | |
2535 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2536 | resume_ptid = inferior_ptid; |
2537 | } | |
fbea99ea PA |
2538 | else |
2539 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2540 | |
7f5ef605 PA |
2541 | if (execution_direction != EXEC_REVERSE |
2542 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2543 | { |
372316f1 PA |
2544 | /* There are two cases where we currently need to step a |
2545 | breakpoint instruction when we have a signal to deliver: | |
2546 | ||
2547 | - See handle_signal_stop where we handle random signals that | |
2548 | could take out us out of the stepping range. Normally, in | |
2549 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2550 | signal handler with a breakpoint at PC, but there are cases |
2551 | where we should _always_ single-step, even if we have a | |
2552 | step-resume breakpoint, like when a software watchpoint is | |
2553 | set. Assuming single-stepping and delivering a signal at the | |
2554 | same time would takes us to the signal handler, then we could | |
2555 | have removed the breakpoint at PC to step over it. However, | |
2556 | some hardware step targets (like e.g., Mac OS) can't step | |
2557 | into signal handlers, and for those, we need to leave the | |
2558 | breakpoint at PC inserted, as otherwise if the handler | |
2559 | recurses and executes PC again, it'll miss the breakpoint. | |
2560 | So we leave the breakpoint inserted anyway, but we need to | |
2561 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2562 | that adjust_pc_after_break doesn't end up confused. |
2563 | ||
2564 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2565 | in one thread after another thread that was stepping had been | |
2566 | momentarily paused for a step-over. When we re-resume the | |
2567 | stepping thread, it may be resumed from that address with a | |
2568 | breakpoint that hasn't trapped yet. Seen with | |
2569 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2570 | do displaced stepping. */ | |
2571 | ||
edbcda09 SM |
2572 | infrun_log_debug ("resume: [%s] stepped breakpoint", |
2573 | target_pid_to_str (tp->ptid).c_str ()); | |
7f5ef605 PA |
2574 | |
2575 | tp->stepped_breakpoint = 1; | |
2576 | ||
b0f16a3e SM |
2577 | /* Most targets can step a breakpoint instruction, thus |
2578 | executing it normally. But if this one cannot, just | |
2579 | continue and we will hit it anyway. */ | |
7f5ef605 | 2580 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2581 | step = 0; |
2582 | } | |
ef5cf84e | 2583 | |
b0f16a3e | 2584 | if (debug_displaced |
cb71640d | 2585 | && tp->control.trap_expected |
3fc8eb30 | 2586 | && use_displaced_stepping (tp) |
cb71640d | 2587 | && !step_over_info_valid_p ()) |
b0f16a3e | 2588 | { |
00431a78 | 2589 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2590 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2591 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2592 | gdb_byte buf[4]; | |
2593 | ||
2594 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2595 | paddress (resume_gdbarch, actual_pc)); | |
2596 | read_memory (actual_pc, buf, sizeof (buf)); | |
2597 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2598 | } | |
237fc4c9 | 2599 | |
b0f16a3e SM |
2600 | if (tp->control.may_range_step) |
2601 | { | |
2602 | /* If we're resuming a thread with the PC out of the step | |
2603 | range, then we're doing some nested/finer run control | |
2604 | operation, like stepping the thread out of the dynamic | |
2605 | linker or the displaced stepping scratch pad. We | |
2606 | shouldn't have allowed a range step then. */ | |
2607 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2608 | } | |
c1e36e3e | 2609 | |
64ce06e4 | 2610 | do_target_resume (resume_ptid, step, sig); |
719546c4 | 2611 | tp->resumed = true; |
c906108c | 2612 | } |
71d378ae PA |
2613 | |
2614 | /* Resume the inferior. SIG is the signal to give the inferior | |
2615 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2616 | rolls back state on error. */ | |
2617 | ||
aff4e175 | 2618 | static void |
71d378ae PA |
2619 | resume (gdb_signal sig) |
2620 | { | |
a70b8144 | 2621 | try |
71d378ae PA |
2622 | { |
2623 | resume_1 (sig); | |
2624 | } | |
230d2906 | 2625 | catch (const gdb_exception &ex) |
71d378ae PA |
2626 | { |
2627 | /* If resuming is being aborted for any reason, delete any | |
2628 | single-step breakpoint resume_1 may have created, to avoid | |
2629 | confusing the following resumption, and to avoid leaving | |
2630 | single-step breakpoints perturbing other threads, in case | |
2631 | we're running in non-stop mode. */ | |
2632 | if (inferior_ptid != null_ptid) | |
2633 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2634 | throw; |
71d378ae | 2635 | } |
71d378ae PA |
2636 | } |
2637 | ||
c906108c | 2638 | \f |
237fc4c9 | 2639 | /* Proceeding. */ |
c906108c | 2640 | |
4c2f2a79 PA |
2641 | /* See infrun.h. */ |
2642 | ||
2643 | /* Counter that tracks number of user visible stops. This can be used | |
2644 | to tell whether a command has proceeded the inferior past the | |
2645 | current location. This allows e.g., inferior function calls in | |
2646 | breakpoint commands to not interrupt the command list. When the | |
2647 | call finishes successfully, the inferior is standing at the same | |
2648 | breakpoint as if nothing happened (and so we don't call | |
2649 | normal_stop). */ | |
2650 | static ULONGEST current_stop_id; | |
2651 | ||
2652 | /* See infrun.h. */ | |
2653 | ||
2654 | ULONGEST | |
2655 | get_stop_id (void) | |
2656 | { | |
2657 | return current_stop_id; | |
2658 | } | |
2659 | ||
2660 | /* Called when we report a user visible stop. */ | |
2661 | ||
2662 | static void | |
2663 | new_stop_id (void) | |
2664 | { | |
2665 | current_stop_id++; | |
2666 | } | |
2667 | ||
c906108c SS |
2668 | /* Clear out all variables saying what to do when inferior is continued. |
2669 | First do this, then set the ones you want, then call `proceed'. */ | |
2670 | ||
a7212384 UW |
2671 | static void |
2672 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2673 | { |
edbcda09 | 2674 | infrun_log_debug ("%s", target_pid_to_str (tp->ptid).c_str ()); |
d6b48e9c | 2675 | |
372316f1 PA |
2676 | /* If we're starting a new sequence, then the previous finished |
2677 | single-step is no longer relevant. */ | |
2678 | if (tp->suspend.waitstatus_pending_p) | |
2679 | { | |
2680 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2681 | { | |
edbcda09 SM |
2682 | infrun_log_debug ("pending event of %s was a finished step. " |
2683 | "Discarding.", | |
2684 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2685 | |
2686 | tp->suspend.waitstatus_pending_p = 0; | |
2687 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2688 | } | |
edbcda09 | 2689 | else |
372316f1 | 2690 | { |
edbcda09 SM |
2691 | infrun_log_debug |
2692 | ("thread %s has pending wait status %s (currently_stepping=%d).", | |
2693 | target_pid_to_str (tp->ptid).c_str (), | |
2694 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2695 | currently_stepping (tp)); | |
372316f1 PA |
2696 | } |
2697 | } | |
2698 | ||
70509625 PA |
2699 | /* If this signal should not be seen by program, give it zero. |
2700 | Used for debugging signals. */ | |
2701 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2702 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2703 | ||
46e3ed7f | 2704 | delete tp->thread_fsm; |
243a9253 PA |
2705 | tp->thread_fsm = NULL; |
2706 | ||
16c381f0 JK |
2707 | tp->control.trap_expected = 0; |
2708 | tp->control.step_range_start = 0; | |
2709 | tp->control.step_range_end = 0; | |
c1e36e3e | 2710 | tp->control.may_range_step = 0; |
16c381f0 JK |
2711 | tp->control.step_frame_id = null_frame_id; |
2712 | tp->control.step_stack_frame_id = null_frame_id; | |
2713 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2714 | tp->control.step_start_function = NULL; |
a7212384 | 2715 | tp->stop_requested = 0; |
4e1c45ea | 2716 | |
16c381f0 | 2717 | tp->control.stop_step = 0; |
32400beb | 2718 | |
16c381f0 | 2719 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2720 | |
856e7dd6 | 2721 | tp->control.stepping_command = 0; |
17b2616c | 2722 | |
a7212384 | 2723 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2724 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2725 | } |
32400beb | 2726 | |
a7212384 | 2727 | void |
70509625 | 2728 | clear_proceed_status (int step) |
a7212384 | 2729 | { |
f2665db5 MM |
2730 | /* With scheduler-locking replay, stop replaying other threads if we're |
2731 | not replaying the user-visible resume ptid. | |
2732 | ||
2733 | This is a convenience feature to not require the user to explicitly | |
2734 | stop replaying the other threads. We're assuming that the user's | |
2735 | intent is to resume tracing the recorded process. */ | |
2736 | if (!non_stop && scheduler_mode == schedlock_replay | |
2737 | && target_record_is_replaying (minus_one_ptid) | |
2738 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2739 | execution_direction)) | |
2740 | target_record_stop_replaying (); | |
2741 | ||
08036331 | 2742 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2743 | { |
08036331 | 2744 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2745 | process_stratum_target *resume_target |
2746 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2747 | |
2748 | /* In all-stop mode, delete the per-thread status of all threads | |
2749 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2750 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2751 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2752 | } |
2753 | ||
d7e15655 | 2754 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2755 | { |
2756 | struct inferior *inferior; | |
2757 | ||
2758 | if (non_stop) | |
2759 | { | |
6c95b8df PA |
2760 | /* If in non-stop mode, only delete the per-thread status of |
2761 | the current thread. */ | |
a7212384 UW |
2762 | clear_proceed_status_thread (inferior_thread ()); |
2763 | } | |
6c95b8df | 2764 | |
d6b48e9c | 2765 | inferior = current_inferior (); |
16c381f0 | 2766 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2767 | } |
2768 | ||
76727919 | 2769 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2770 | } |
2771 | ||
99619bea PA |
2772 | /* Returns true if TP is still stopped at a breakpoint that needs |
2773 | stepping-over in order to make progress. If the breakpoint is gone | |
2774 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2775 | |
2776 | static int | |
6c4cfb24 | 2777 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2778 | { |
2779 | if (tp->stepping_over_breakpoint) | |
2780 | { | |
00431a78 | 2781 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2782 | |
a01bda52 | 2783 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2784 | regcache_read_pc (regcache)) |
2785 | == ordinary_breakpoint_here) | |
99619bea PA |
2786 | return 1; |
2787 | ||
2788 | tp->stepping_over_breakpoint = 0; | |
2789 | } | |
2790 | ||
2791 | return 0; | |
2792 | } | |
2793 | ||
6c4cfb24 PA |
2794 | /* Check whether thread TP still needs to start a step-over in order |
2795 | to make progress when resumed. Returns an bitwise or of enum | |
2796 | step_over_what bits, indicating what needs to be stepped over. */ | |
2797 | ||
8d297bbf | 2798 | static step_over_what |
6c4cfb24 PA |
2799 | thread_still_needs_step_over (struct thread_info *tp) |
2800 | { | |
8d297bbf | 2801 | step_over_what what = 0; |
6c4cfb24 PA |
2802 | |
2803 | if (thread_still_needs_step_over_bp (tp)) | |
2804 | what |= STEP_OVER_BREAKPOINT; | |
2805 | ||
2806 | if (tp->stepping_over_watchpoint | |
2807 | && !target_have_steppable_watchpoint) | |
2808 | what |= STEP_OVER_WATCHPOINT; | |
2809 | ||
2810 | return what; | |
2811 | } | |
2812 | ||
483805cf PA |
2813 | /* Returns true if scheduler locking applies. STEP indicates whether |
2814 | we're about to do a step/next-like command to a thread. */ | |
2815 | ||
2816 | static int | |
856e7dd6 | 2817 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2818 | { |
2819 | return (scheduler_mode == schedlock_on | |
2820 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2821 | && tp->control.stepping_command) |
2822 | || (scheduler_mode == schedlock_replay | |
2823 | && target_record_will_replay (minus_one_ptid, | |
2824 | execution_direction))); | |
483805cf PA |
2825 | } |
2826 | ||
5b6d1e4f PA |
2827 | /* Calls target_commit_resume on all targets. */ |
2828 | ||
2829 | static void | |
2830 | commit_resume_all_targets () | |
2831 | { | |
2832 | scoped_restore_current_thread restore_thread; | |
2833 | ||
2834 | /* Map between process_target and a representative inferior. This | |
2835 | is to avoid committing a resume in the same target more than | |
2836 | once. Resumptions must be idempotent, so this is an | |
2837 | optimization. */ | |
2838 | std::unordered_map<process_stratum_target *, inferior *> conn_inf; | |
2839 | ||
2840 | for (inferior *inf : all_non_exited_inferiors ()) | |
2841 | if (inf->has_execution ()) | |
2842 | conn_inf[inf->process_target ()] = inf; | |
2843 | ||
2844 | for (const auto &ci : conn_inf) | |
2845 | { | |
2846 | inferior *inf = ci.second; | |
2847 | switch_to_inferior_no_thread (inf); | |
2848 | target_commit_resume (); | |
2849 | } | |
2850 | } | |
2851 | ||
2f4fcf00 PA |
2852 | /* Check that all the targets we're about to resume are in non-stop |
2853 | mode. Ideally, we'd only care whether all targets support | |
2854 | target-async, but we're not there yet. E.g., stop_all_threads | |
2855 | doesn't know how to handle all-stop targets. Also, the remote | |
2856 | protocol in all-stop mode is synchronous, irrespective of | |
2857 | target-async, which means that things like a breakpoint re-set | |
2858 | triggered by one target would try to read memory from all targets | |
2859 | and fail. */ | |
2860 | ||
2861 | static void | |
2862 | check_multi_target_resumption (process_stratum_target *resume_target) | |
2863 | { | |
2864 | if (!non_stop && resume_target == nullptr) | |
2865 | { | |
2866 | scoped_restore_current_thread restore_thread; | |
2867 | ||
2868 | /* This is used to track whether we're resuming more than one | |
2869 | target. */ | |
2870 | process_stratum_target *first_connection = nullptr; | |
2871 | ||
2872 | /* The first inferior we see with a target that does not work in | |
2873 | always-non-stop mode. */ | |
2874 | inferior *first_not_non_stop = nullptr; | |
2875 | ||
2876 | for (inferior *inf : all_non_exited_inferiors (resume_target)) | |
2877 | { | |
2878 | switch_to_inferior_no_thread (inf); | |
2879 | ||
2880 | if (!target_has_execution) | |
2881 | continue; | |
2882 | ||
2883 | process_stratum_target *proc_target | |
2884 | = current_inferior ()->process_target(); | |
2885 | ||
2886 | if (!target_is_non_stop_p ()) | |
2887 | first_not_non_stop = inf; | |
2888 | ||
2889 | if (first_connection == nullptr) | |
2890 | first_connection = proc_target; | |
2891 | else if (first_connection != proc_target | |
2892 | && first_not_non_stop != nullptr) | |
2893 | { | |
2894 | switch_to_inferior_no_thread (first_not_non_stop); | |
2895 | ||
2896 | proc_target = current_inferior ()->process_target(); | |
2897 | ||
2898 | error (_("Connection %d (%s) does not support " | |
2899 | "multi-target resumption."), | |
2900 | proc_target->connection_number, | |
2901 | make_target_connection_string (proc_target).c_str ()); | |
2902 | } | |
2903 | } | |
2904 | } | |
2905 | } | |
2906 | ||
c906108c SS |
2907 | /* Basic routine for continuing the program in various fashions. |
2908 | ||
2909 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
2910 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
2911 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
2912 | |
2913 | You should call clear_proceed_status before calling proceed. */ | |
2914 | ||
2915 | void | |
64ce06e4 | 2916 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2917 | { |
e58b0e63 PA |
2918 | struct regcache *regcache; |
2919 | struct gdbarch *gdbarch; | |
e58b0e63 | 2920 | CORE_ADDR pc; |
4d9d9d04 PA |
2921 | struct execution_control_state ecss; |
2922 | struct execution_control_state *ecs = &ecss; | |
4d9d9d04 | 2923 | int started; |
c906108c | 2924 | |
e58b0e63 PA |
2925 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2926 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2927 | resuming the current thread. */ | |
2928 | if (!follow_fork ()) | |
2929 | { | |
2930 | /* The target for some reason decided not to resume. */ | |
2931 | normal_stop (); | |
f148b27e | 2932 | if (target_can_async_p ()) |
b1a35af2 | 2933 | inferior_event_handler (INF_EXEC_COMPLETE); |
e58b0e63 PA |
2934 | return; |
2935 | } | |
2936 | ||
842951eb PA |
2937 | /* We'll update this if & when we switch to a new thread. */ |
2938 | previous_inferior_ptid = inferior_ptid; | |
2939 | ||
e58b0e63 | 2940 | regcache = get_current_regcache (); |
ac7936df | 2941 | gdbarch = regcache->arch (); |
8b86c959 YQ |
2942 | const address_space *aspace = regcache->aspace (); |
2943 | ||
fc75c28b TBA |
2944 | pc = regcache_read_pc_protected (regcache); |
2945 | ||
08036331 | 2946 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 2947 | |
99619bea | 2948 | /* Fill in with reasonable starting values. */ |
08036331 | 2949 | init_thread_stepping_state (cur_thr); |
99619bea | 2950 | |
08036331 | 2951 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 2952 | |
5b6d1e4f PA |
2953 | ptid_t resume_ptid |
2954 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
2955 | process_stratum_target *resume_target | |
2956 | = user_visible_resume_target (resume_ptid); | |
2957 | ||
2f4fcf00 PA |
2958 | check_multi_target_resumption (resume_target); |
2959 | ||
2acceee2 | 2960 | if (addr == (CORE_ADDR) -1) |
c906108c | 2961 | { |
08036331 | 2962 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 2963 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 2964 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2965 | /* There is a breakpoint at the address we will resume at, |
2966 | step one instruction before inserting breakpoints so that | |
2967 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2968 | breakpoint). |
2969 | ||
2970 | Note, we don't do this in reverse, because we won't | |
2971 | actually be executing the breakpoint insn anyway. | |
2972 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 2973 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
2974 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2975 | && gdbarch_single_step_through_delay (gdbarch, | |
2976 | get_current_frame ())) | |
3352ef37 AC |
2977 | /* We stepped onto an instruction that needs to be stepped |
2978 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 2979 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
2980 | } |
2981 | else | |
2982 | { | |
515630c5 | 2983 | regcache_write_pc (regcache, addr); |
c906108c SS |
2984 | } |
2985 | ||
70509625 | 2986 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 2987 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 2988 | |
4d9d9d04 PA |
2989 | /* If an exception is thrown from this point on, make sure to |
2990 | propagate GDB's knowledge of the executing state to the | |
2991 | frontend/user running state. */ | |
5b6d1e4f | 2992 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
2993 | |
2994 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
2995 | threads (e.g., we might need to set threads stepping over | |
2996 | breakpoints first), from the user/frontend's point of view, all | |
2997 | threads in RESUME_PTID are now running. Unless we're calling an | |
2998 | inferior function, as in that case we pretend the inferior | |
2999 | doesn't run at all. */ | |
08036331 | 3000 | if (!cur_thr->control.in_infcall) |
719546c4 | 3001 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3002 | |
edbcda09 SM |
3003 | infrun_log_debug ("addr=%s, signal=%s", paddress (gdbarch, addr), |
3004 | gdb_signal_to_symbol_string (siggnal)); | |
527159b7 | 3005 | |
4d9d9d04 PA |
3006 | annotate_starting (); |
3007 | ||
3008 | /* Make sure that output from GDB appears before output from the | |
3009 | inferior. */ | |
3010 | gdb_flush (gdb_stdout); | |
3011 | ||
d930703d PA |
3012 | /* Since we've marked the inferior running, give it the terminal. A |
3013 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3014 | still detect attempts to unblock a stuck connection with repeated | |
3015 | Ctrl-C from within target_pass_ctrlc). */ | |
3016 | target_terminal::inferior (); | |
3017 | ||
4d9d9d04 PA |
3018 | /* In a multi-threaded task we may select another thread and |
3019 | then continue or step. | |
3020 | ||
3021 | But if a thread that we're resuming had stopped at a breakpoint, | |
3022 | it will immediately cause another breakpoint stop without any | |
3023 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3024 | we must step over it first. | |
3025 | ||
3026 | Look for threads other than the current (TP) that reported a | |
3027 | breakpoint hit and haven't been resumed yet since. */ | |
3028 | ||
3029 | /* If scheduler locking applies, we can avoid iterating over all | |
3030 | threads. */ | |
08036331 | 3031 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3032 | { |
5b6d1e4f PA |
3033 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3034 | resume_ptid)) | |
08036331 | 3035 | { |
f3f8ece4 PA |
3036 | switch_to_thread_no_regs (tp); |
3037 | ||
4d9d9d04 PA |
3038 | /* Ignore the current thread here. It's handled |
3039 | afterwards. */ | |
08036331 | 3040 | if (tp == cur_thr) |
4d9d9d04 | 3041 | continue; |
c906108c | 3042 | |
4d9d9d04 PA |
3043 | if (!thread_still_needs_step_over (tp)) |
3044 | continue; | |
3045 | ||
3046 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3047 | |
edbcda09 SM |
3048 | infrun_log_debug ("need to step-over [%s] first", |
3049 | target_pid_to_str (tp->ptid).c_str ()); | |
99619bea | 3050 | |
7bd43605 | 3051 | global_thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3052 | } |
f3f8ece4 PA |
3053 | |
3054 | switch_to_thread (cur_thr); | |
30852783 UW |
3055 | } |
3056 | ||
4d9d9d04 PA |
3057 | /* Enqueue the current thread last, so that we move all other |
3058 | threads over their breakpoints first. */ | |
08036331 | 3059 | if (cur_thr->stepping_over_breakpoint) |
7bd43605 | 3060 | global_thread_step_over_chain_enqueue (cur_thr); |
30852783 | 3061 | |
4d9d9d04 PA |
3062 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3063 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3064 | advanced. Must do this before resuming any thread, as in | |
3065 | all-stop/remote, once we resume we can't send any other packet | |
3066 | until the target stops again. */ | |
fc75c28b | 3067 | cur_thr->prev_pc = regcache_read_pc_protected (regcache); |
99619bea | 3068 | |
a9bc57b9 TT |
3069 | { |
3070 | scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume (); | |
85ad3aaf | 3071 | |
a9bc57b9 | 3072 | started = start_step_over (); |
c906108c | 3073 | |
a9bc57b9 TT |
3074 | if (step_over_info_valid_p ()) |
3075 | { | |
3076 | /* Either this thread started a new in-line step over, or some | |
3077 | other thread was already doing one. In either case, don't | |
3078 | resume anything else until the step-over is finished. */ | |
3079 | } | |
3080 | else if (started && !target_is_non_stop_p ()) | |
3081 | { | |
3082 | /* A new displaced stepping sequence was started. In all-stop, | |
3083 | we can't talk to the target anymore until it next stops. */ | |
3084 | } | |
3085 | else if (!non_stop && target_is_non_stop_p ()) | |
3086 | { | |
3087 | /* In all-stop, but the target is always in non-stop mode. | |
3088 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3089 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3090 | resume_ptid)) | |
3091 | { | |
3092 | switch_to_thread_no_regs (tp); | |
3093 | ||
f9fac3c8 SM |
3094 | if (!tp->inf->has_execution ()) |
3095 | { | |
edbcda09 SM |
3096 | infrun_log_debug ("[%s] target has no execution", |
3097 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3098 | continue; |
3099 | } | |
f3f8ece4 | 3100 | |
f9fac3c8 SM |
3101 | if (tp->resumed) |
3102 | { | |
edbcda09 SM |
3103 | infrun_log_debug ("[%s] resumed", |
3104 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3105 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
3106 | continue; | |
3107 | } | |
fbea99ea | 3108 | |
f9fac3c8 SM |
3109 | if (thread_is_in_step_over_chain (tp)) |
3110 | { | |
edbcda09 SM |
3111 | infrun_log_debug ("[%s] needs step-over", |
3112 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3113 | continue; |
3114 | } | |
fbea99ea | 3115 | |
edbcda09 SM |
3116 | infrun_log_debug ("resuming %s", |
3117 | target_pid_to_str (tp->ptid).c_str ()); | |
fbea99ea | 3118 | |
f9fac3c8 SM |
3119 | reset_ecs (ecs, tp); |
3120 | switch_to_thread (tp); | |
3121 | keep_going_pass_signal (ecs); | |
3122 | if (!ecs->wait_some_more) | |
3123 | error (_("Command aborted.")); | |
3124 | } | |
a9bc57b9 | 3125 | } |
08036331 | 3126 | else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3127 | { |
3128 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3129 | reset_ecs (ecs, cur_thr); |
3130 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3131 | keep_going_pass_signal (ecs); |
3132 | if (!ecs->wait_some_more) | |
3133 | error (_("Command aborted.")); | |
3134 | } | |
3135 | } | |
c906108c | 3136 | |
5b6d1e4f | 3137 | commit_resume_all_targets (); |
85ad3aaf | 3138 | |
731f534f | 3139 | finish_state.release (); |
c906108c | 3140 | |
873657b9 PA |
3141 | /* If we've switched threads above, switch back to the previously |
3142 | current thread. We don't want the user to see a different | |
3143 | selected thread. */ | |
3144 | switch_to_thread (cur_thr); | |
3145 | ||
0b333c5e PA |
3146 | /* Tell the event loop to wait for it to stop. If the target |
3147 | supports asynchronous execution, it'll do this from within | |
3148 | target_resume. */ | |
362646f5 | 3149 | if (!target_can_async_p ()) |
0b333c5e | 3150 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3151 | } |
c906108c SS |
3152 | \f |
3153 | ||
3154 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3155 | |
c906108c | 3156 | void |
8621d6a9 | 3157 | start_remote (int from_tty) |
c906108c | 3158 | { |
5b6d1e4f PA |
3159 | inferior *inf = current_inferior (); |
3160 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3161 | |
1777feb0 | 3162 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3163 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3164 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3165 | nothing is returned (instead of just blocking). Because of this, |
3166 | targets expecting an immediate response need to, internally, set | |
3167 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3168 | timeout. */ |
6426a772 JM |
3169 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3170 | differentiate to its caller what the state of the target is after | |
3171 | the initial open has been performed. Here we're assuming that | |
3172 | the target has stopped. It should be possible to eventually have | |
3173 | target_open() return to the caller an indication that the target | |
3174 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3175 | for an async run. */ |
5b6d1e4f | 3176 | wait_for_inferior (inf); |
8621d6a9 DJ |
3177 | |
3178 | /* Now that the inferior has stopped, do any bookkeeping like | |
3179 | loading shared libraries. We want to do this before normal_stop, | |
3180 | so that the displayed frame is up to date. */ | |
8b88a78e | 3181 | post_create_inferior (current_top_target (), from_tty); |
8621d6a9 | 3182 | |
6426a772 | 3183 | normal_stop (); |
c906108c SS |
3184 | } |
3185 | ||
3186 | /* Initialize static vars when a new inferior begins. */ | |
3187 | ||
3188 | void | |
96baa820 | 3189 | init_wait_for_inferior (void) |
c906108c SS |
3190 | { |
3191 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3192 | |
c906108c SS |
3193 | breakpoint_init_inferior (inf_starting); |
3194 | ||
70509625 | 3195 | clear_proceed_status (0); |
9f976b41 | 3196 | |
ab1ddbcf | 3197 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3198 | |
842951eb | 3199 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3200 | } |
237fc4c9 | 3201 | |
c906108c | 3202 | \f |
488f131b | 3203 | |
ec9499be | 3204 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3205 | |
568d6575 UW |
3206 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3207 | struct execution_control_state *ecs); | |
3208 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3209 | struct execution_control_state *ecs); | |
4f5d7f63 | 3210 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3211 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3212 | struct frame_info *); |
611c83ae | 3213 | |
bdc36728 | 3214 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3215 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3216 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3217 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3218 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3219 | |
252fbfc8 PA |
3220 | /* This function is attached as a "thread_stop_requested" observer. |
3221 | Cleanup local state that assumed the PTID was to be resumed, and | |
3222 | report the stop to the frontend. */ | |
3223 | ||
2c0b251b | 3224 | static void |
252fbfc8 PA |
3225 | infrun_thread_stop_requested (ptid_t ptid) |
3226 | { | |
5b6d1e4f PA |
3227 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3228 | ||
c65d6b55 PA |
3229 | /* PTID was requested to stop. If the thread was already stopped, |
3230 | but the user/frontend doesn't know about that yet (e.g., the | |
3231 | thread had been temporarily paused for some step-over), set up | |
3232 | for reporting the stop now. */ | |
5b6d1e4f | 3233 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3234 | { |
3235 | if (tp->state != THREAD_RUNNING) | |
3236 | continue; | |
3237 | if (tp->executing) | |
3238 | continue; | |
c65d6b55 | 3239 | |
08036331 PA |
3240 | /* Remove matching threads from the step-over queue, so |
3241 | start_step_over doesn't try to resume them | |
3242 | automatically. */ | |
3243 | if (thread_is_in_step_over_chain (tp)) | |
7bd43605 | 3244 | global_thread_step_over_chain_remove (tp); |
c65d6b55 | 3245 | |
08036331 PA |
3246 | /* If the thread is stopped, but the user/frontend doesn't |
3247 | know about that yet, queue a pending event, as if the | |
3248 | thread had just stopped now. Unless the thread already had | |
3249 | a pending event. */ | |
3250 | if (!tp->suspend.waitstatus_pending_p) | |
3251 | { | |
3252 | tp->suspend.waitstatus_pending_p = 1; | |
3253 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3254 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3255 | } | |
c65d6b55 | 3256 | |
08036331 PA |
3257 | /* Clear the inline-frame state, since we're re-processing the |
3258 | stop. */ | |
5b6d1e4f | 3259 | clear_inline_frame_state (tp); |
c65d6b55 | 3260 | |
08036331 PA |
3261 | /* If this thread was paused because some other thread was |
3262 | doing an inline-step over, let that finish first. Once | |
3263 | that happens, we'll restart all threads and consume pending | |
3264 | stop events then. */ | |
3265 | if (step_over_info_valid_p ()) | |
3266 | continue; | |
3267 | ||
3268 | /* Otherwise we can process the (new) pending event now. Set | |
3269 | it so this pending event is considered by | |
3270 | do_target_wait. */ | |
719546c4 | 3271 | tp->resumed = true; |
08036331 | 3272 | } |
252fbfc8 PA |
3273 | } |
3274 | ||
a07daef3 PA |
3275 | static void |
3276 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3277 | { | |
5b6d1e4f PA |
3278 | if (target_last_proc_target == tp->inf->process_target () |
3279 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3280 | nullify_last_target_wait_ptid (); |
3281 | } | |
3282 | ||
0cbcdb96 PA |
3283 | /* Delete the step resume, single-step and longjmp/exception resume |
3284 | breakpoints of TP. */ | |
4e1c45ea | 3285 | |
0cbcdb96 PA |
3286 | static void |
3287 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3288 | { |
0cbcdb96 PA |
3289 | delete_step_resume_breakpoint (tp); |
3290 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3291 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3292 | } |
3293 | ||
0cbcdb96 PA |
3294 | /* If the target still has execution, call FUNC for each thread that |
3295 | just stopped. In all-stop, that's all the non-exited threads; in | |
3296 | non-stop, that's the current thread, only. */ | |
3297 | ||
3298 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3299 | (struct thread_info *tp); | |
4e1c45ea PA |
3300 | |
3301 | static void | |
0cbcdb96 | 3302 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3303 | { |
d7e15655 | 3304 | if (!target_has_execution || inferior_ptid == null_ptid) |
4e1c45ea PA |
3305 | return; |
3306 | ||
fbea99ea | 3307 | if (target_is_non_stop_p ()) |
4e1c45ea | 3308 | { |
0cbcdb96 PA |
3309 | /* If in non-stop mode, only the current thread stopped. */ |
3310 | func (inferior_thread ()); | |
4e1c45ea PA |
3311 | } |
3312 | else | |
0cbcdb96 | 3313 | { |
0cbcdb96 | 3314 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3315 | for (thread_info *tp : all_non_exited_threads ()) |
3316 | func (tp); | |
0cbcdb96 PA |
3317 | } |
3318 | } | |
3319 | ||
3320 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3321 | the threads that just stopped. */ | |
3322 | ||
3323 | static void | |
3324 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3325 | { | |
3326 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3327 | } |
3328 | ||
3329 | /* Delete the single-step breakpoints of the threads that just | |
3330 | stopped. */ | |
7c16b83e | 3331 | |
34b7e8a6 PA |
3332 | static void |
3333 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3334 | { | |
3335 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3336 | } |
3337 | ||
221e1a37 | 3338 | /* See infrun.h. */ |
223698f8 | 3339 | |
221e1a37 | 3340 | void |
223698f8 DE |
3341 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3342 | const struct target_waitstatus *ws) | |
3343 | { | |
23fdd69e | 3344 | std::string status_string = target_waitstatus_to_string (ws); |
d7e74731 | 3345 | string_file stb; |
223698f8 DE |
3346 | |
3347 | /* The text is split over several lines because it was getting too long. | |
3348 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3349 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3350 | is set. */ | |
3351 | ||
d7e74731 | 3352 | stb.printf ("infrun: target_wait (%d.%ld.%ld", |
e99b03dc | 3353 | waiton_ptid.pid (), |
e38504b3 | 3354 | waiton_ptid.lwp (), |
cc6bcb54 | 3355 | waiton_ptid.tid ()); |
e99b03dc | 3356 | if (waiton_ptid.pid () != -1) |
a068643d | 3357 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid).c_str ()); |
d7e74731 PA |
3358 | stb.printf (", status) =\n"); |
3359 | stb.printf ("infrun: %d.%ld.%ld [%s],\n", | |
e99b03dc | 3360 | result_ptid.pid (), |
e38504b3 | 3361 | result_ptid.lwp (), |
cc6bcb54 | 3362 | result_ptid.tid (), |
a068643d | 3363 | target_pid_to_str (result_ptid).c_str ()); |
23fdd69e | 3364 | stb.printf ("infrun: %s\n", status_string.c_str ()); |
223698f8 DE |
3365 | |
3366 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3367 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3368 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3369 | } |
3370 | ||
372316f1 PA |
3371 | /* Select a thread at random, out of those which are resumed and have |
3372 | had events. */ | |
3373 | ||
3374 | static struct thread_info * | |
5b6d1e4f | 3375 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3376 | { |
372316f1 | 3377 | int num_events = 0; |
08036331 | 3378 | |
5b6d1e4f | 3379 | auto has_event = [&] (thread_info *tp) |
08036331 | 3380 | { |
5b6d1e4f PA |
3381 | return (tp->ptid.matches (waiton_ptid) |
3382 | && tp->resumed | |
08036331 PA |
3383 | && tp->suspend.waitstatus_pending_p); |
3384 | }; | |
372316f1 PA |
3385 | |
3386 | /* First see how many events we have. Count only resumed threads | |
3387 | that have an event pending. */ | |
5b6d1e4f | 3388 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3389 | if (has_event (tp)) |
372316f1 PA |
3390 | num_events++; |
3391 | ||
3392 | if (num_events == 0) | |
3393 | return NULL; | |
3394 | ||
3395 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3396 | int random_selector = (int) ((num_events * (double) rand ()) |
3397 | / (RAND_MAX + 1.0)); | |
372316f1 | 3398 | |
edbcda09 SM |
3399 | if (num_events > 1) |
3400 | infrun_log_debug ("Found %d events, selecting #%d", | |
3401 | num_events, random_selector); | |
372316f1 PA |
3402 | |
3403 | /* Select the Nth thread that has had an event. */ | |
5b6d1e4f | 3404 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3405 | if (has_event (tp)) |
372316f1 | 3406 | if (random_selector-- == 0) |
08036331 | 3407 | return tp; |
372316f1 | 3408 | |
08036331 | 3409 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3410 | } |
3411 | ||
3412 | /* Wrapper for target_wait that first checks whether threads have | |
3413 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3414 | more events. INF is the inferior we're using to call target_wait |
3415 | on. */ | |
372316f1 PA |
3416 | |
3417 | static ptid_t | |
5b6d1e4f PA |
3418 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
3419 | target_waitstatus *status, int options) | |
372316f1 PA |
3420 | { |
3421 | ptid_t event_ptid; | |
3422 | struct thread_info *tp; | |
3423 | ||
24ed6739 AB |
3424 | /* We know that we are looking for an event in the target of inferior |
3425 | INF, but we don't know which thread the event might come from. As | |
3426 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3427 | the wait code relies on it - doing so is always a mistake. */ | |
3428 | switch_to_inferior_no_thread (inf); | |
3429 | ||
372316f1 PA |
3430 | /* First check if there is a resumed thread with a wait status |
3431 | pending. */ | |
d7e15655 | 3432 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3433 | { |
5b6d1e4f | 3434 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3435 | } |
3436 | else | |
3437 | { | |
edbcda09 SM |
3438 | infrun_log_debug ("Waiting for specific thread %s.", |
3439 | target_pid_to_str (ptid).c_str ()); | |
372316f1 PA |
3440 | |
3441 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3442 | tp = find_thread_ptid (inf, ptid); |
372316f1 PA |
3443 | gdb_assert (tp != NULL); |
3444 | if (!tp->suspend.waitstatus_pending_p) | |
3445 | tp = NULL; | |
3446 | } | |
3447 | ||
3448 | if (tp != NULL | |
3449 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3450 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3451 | { | |
00431a78 | 3452 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3453 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3454 | CORE_ADDR pc; |
3455 | int discard = 0; | |
3456 | ||
3457 | pc = regcache_read_pc (regcache); | |
3458 | ||
3459 | if (pc != tp->suspend.stop_pc) | |
3460 | { | |
edbcda09 SM |
3461 | infrun_log_debug ("PC of %s changed. was=%s, now=%s", |
3462 | target_pid_to_str (tp->ptid).c_str (), | |
3463 | paddress (gdbarch, tp->suspend.stop_pc), | |
3464 | paddress (gdbarch, pc)); | |
372316f1 PA |
3465 | discard = 1; |
3466 | } | |
a01bda52 | 3467 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 | 3468 | { |
edbcda09 SM |
3469 | infrun_log_debug ("previous breakpoint of %s, at %s gone", |
3470 | target_pid_to_str (tp->ptid).c_str (), | |
3471 | paddress (gdbarch, pc)); | |
372316f1 PA |
3472 | |
3473 | discard = 1; | |
3474 | } | |
3475 | ||
3476 | if (discard) | |
3477 | { | |
edbcda09 SM |
3478 | infrun_log_debug ("pending event of %s cancelled.", |
3479 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3480 | |
3481 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3482 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3483 | } | |
3484 | } | |
3485 | ||
3486 | if (tp != NULL) | |
3487 | { | |
edbcda09 SM |
3488 | infrun_log_debug ("Using pending wait status %s for %s.", |
3489 | target_waitstatus_to_string | |
3490 | (&tp->suspend.waitstatus).c_str (), | |
3491 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3492 | |
3493 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3494 | if it was a software breakpoint (and the target doesn't | |
3495 | always adjust the PC itself). */ | |
3496 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3497 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3498 | { | |
3499 | struct regcache *regcache; | |
3500 | struct gdbarch *gdbarch; | |
3501 | int decr_pc; | |
3502 | ||
00431a78 | 3503 | regcache = get_thread_regcache (tp); |
ac7936df | 3504 | gdbarch = regcache->arch (); |
372316f1 PA |
3505 | |
3506 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3507 | if (decr_pc != 0) | |
3508 | { | |
3509 | CORE_ADDR pc; | |
3510 | ||
3511 | pc = regcache_read_pc (regcache); | |
3512 | regcache_write_pc (regcache, pc + decr_pc); | |
3513 | } | |
3514 | } | |
3515 | ||
3516 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3517 | *status = tp->suspend.waitstatus; | |
3518 | tp->suspend.waitstatus_pending_p = 0; | |
3519 | ||
3520 | /* Wake up the event loop again, until all pending events are | |
3521 | processed. */ | |
3522 | if (target_is_async_p ()) | |
3523 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3524 | return tp->ptid; | |
3525 | } | |
3526 | ||
3527 | /* But if we don't find one, we'll have to wait. */ | |
3528 | ||
3529 | if (deprecated_target_wait_hook) | |
3530 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3531 | else | |
3532 | event_ptid = target_wait (ptid, status, options); | |
3533 | ||
3534 | return event_ptid; | |
3535 | } | |
3536 | ||
5b6d1e4f PA |
3537 | /* Wrapper for target_wait that first checks whether threads have |
3538 | pending statuses to report before actually asking the target for | |
cad90433 | 3539 | more events. Polls for events from all inferiors/targets. */ |
5b6d1e4f PA |
3540 | |
3541 | static bool | |
3542 | do_target_wait (ptid_t wait_ptid, execution_control_state *ecs, int options) | |
3543 | { | |
3544 | int num_inferiors = 0; | |
3545 | int random_selector; | |
3546 | ||
cad90433 SM |
3547 | /* For fairness, we pick the first inferior/target to poll at random |
3548 | out of all inferiors that may report events, and then continue | |
3549 | polling the rest of the inferior list starting from that one in a | |
3550 | circular fashion until the whole list is polled once. */ | |
5b6d1e4f PA |
3551 | |
3552 | auto inferior_matches = [&wait_ptid] (inferior *inf) | |
3553 | { | |
3554 | return (inf->process_target () != NULL | |
5b6d1e4f PA |
3555 | && ptid_t (inf->pid).matches (wait_ptid)); |
3556 | }; | |
3557 | ||
cad90433 | 3558 | /* First see how many matching inferiors we have. */ |
5b6d1e4f PA |
3559 | for (inferior *inf : all_inferiors ()) |
3560 | if (inferior_matches (inf)) | |
3561 | num_inferiors++; | |
3562 | ||
3563 | if (num_inferiors == 0) | |
3564 | { | |
3565 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3566 | return false; | |
3567 | } | |
3568 | ||
cad90433 | 3569 | /* Now randomly pick an inferior out of those that matched. */ |
5b6d1e4f PA |
3570 | random_selector = (int) |
3571 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3572 | ||
edbcda09 SM |
3573 | if (num_inferiors > 1) |
3574 | infrun_log_debug ("Found %d inferiors, starting at #%d", | |
3575 | num_inferiors, random_selector); | |
5b6d1e4f | 3576 | |
cad90433 | 3577 | /* Select the Nth inferior that matched. */ |
5b6d1e4f PA |
3578 | |
3579 | inferior *selected = nullptr; | |
3580 | ||
3581 | for (inferior *inf : all_inferiors ()) | |
3582 | if (inferior_matches (inf)) | |
3583 | if (random_selector-- == 0) | |
3584 | { | |
3585 | selected = inf; | |
3586 | break; | |
3587 | } | |
3588 | ||
cad90433 | 3589 | /* Now poll for events out of each of the matching inferior's |
5b6d1e4f PA |
3590 | targets, starting from the selected one. */ |
3591 | ||
3592 | auto do_wait = [&] (inferior *inf) | |
3593 | { | |
5b6d1e4f PA |
3594 | ecs->ptid = do_target_wait_1 (inf, wait_ptid, &ecs->ws, options); |
3595 | ecs->target = inf->process_target (); | |
3596 | return (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3597 | }; | |
3598 | ||
cad90433 SM |
3599 | /* Needed in 'all-stop + target-non-stop' mode, because we end up |
3600 | here spuriously after the target is all stopped and we've already | |
5b6d1e4f PA |
3601 | reported the stop to the user, polling for events. */ |
3602 | scoped_restore_current_thread restore_thread; | |
3603 | ||
3604 | int inf_num = selected->num; | |
3605 | for (inferior *inf = selected; inf != NULL; inf = inf->next) | |
3606 | if (inferior_matches (inf)) | |
3607 | if (do_wait (inf)) | |
3608 | return true; | |
3609 | ||
3610 | for (inferior *inf = inferior_list; | |
3611 | inf != NULL && inf->num < inf_num; | |
3612 | inf = inf->next) | |
3613 | if (inferior_matches (inf)) | |
3614 | if (do_wait (inf)) | |
3615 | return true; | |
3616 | ||
3617 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3618 | return false; | |
3619 | } | |
3620 | ||
24291992 PA |
3621 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3622 | detaching while a thread is displaced stepping is a recipe for | |
3623 | crashing it, as nothing would readjust the PC out of the scratch | |
3624 | pad. */ | |
3625 | ||
3626 | void | |
3627 | prepare_for_detach (void) | |
3628 | { | |
3629 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3630 | ptid_t pid_ptid = ptid_t (inf->pid); |
24291992 | 3631 | |
9844051a | 3632 | // displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf); |
24291992 PA |
3633 | |
3634 | /* Is any thread of this process displaced stepping? If not, | |
3635 | there's nothing else to do. */ | |
9844051a | 3636 | if (displaced_step_in_progress (inf)) |
24291992 PA |
3637 | return; |
3638 | ||
edbcda09 | 3639 | infrun_log_debug ("displaced-stepping in-process while detaching"); |
24291992 | 3640 | |
9bcb1f16 | 3641 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3642 | |
9844051a SM |
3643 | // FIXME |
3644 | while (false) | |
24291992 | 3645 | { |
24291992 PA |
3646 | struct execution_control_state ecss; |
3647 | struct execution_control_state *ecs; | |
3648 | ||
3649 | ecs = &ecss; | |
3650 | memset (ecs, 0, sizeof (*ecs)); | |
3651 | ||
3652 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3653 | /* Flush target cache before starting to handle each event. |
3654 | Target was running and cache could be stale. This is just a | |
3655 | heuristic. Running threads may modify target memory, but we | |
3656 | don't get any event. */ | |
3657 | target_dcache_invalidate (); | |
24291992 | 3658 | |
5b6d1e4f | 3659 | do_target_wait (pid_ptid, ecs, 0); |
24291992 PA |
3660 | |
3661 | if (debug_infrun) | |
3662 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3663 | ||
3664 | /* If an error happens while handling the event, propagate GDB's | |
3665 | knowledge of the executing state to the frontend/user running | |
3666 | state. */ | |
5b6d1e4f PA |
3667 | scoped_finish_thread_state finish_state (inf->process_target (), |
3668 | minus_one_ptid); | |
24291992 PA |
3669 | |
3670 | /* Now figure out what to do with the result of the result. */ | |
3671 | handle_inferior_event (ecs); | |
3672 | ||
3673 | /* No error, don't finish the state yet. */ | |
731f534f | 3674 | finish_state.release (); |
24291992 PA |
3675 | |
3676 | /* Breakpoints and watchpoints are not installed on the target | |
3677 | at this point, and signals are passed directly to the | |
3678 | inferior, so this must mean the process is gone. */ | |
3679 | if (!ecs->wait_some_more) | |
3680 | { | |
9bcb1f16 | 3681 | restore_detaching.release (); |
24291992 PA |
3682 | error (_("Program exited while detaching")); |
3683 | } | |
3684 | } | |
3685 | ||
9bcb1f16 | 3686 | restore_detaching.release (); |
24291992 PA |
3687 | } |
3688 | ||
cd0fc7c3 | 3689 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3690 | |
cd0fc7c3 SS |
3691 | If inferior gets a signal, we may decide to start it up again |
3692 | instead of returning. That is why there is a loop in this function. | |
3693 | When this function actually returns it means the inferior | |
3694 | should be left stopped and GDB should read more commands. */ | |
3695 | ||
5b6d1e4f PA |
3696 | static void |
3697 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3698 | { |
edbcda09 | 3699 | infrun_log_debug ("wait_for_inferior ()"); |
527159b7 | 3700 | |
4c41382a | 3701 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3702 | |
e6f5c25b PA |
3703 | /* If an error happens while handling the event, propagate GDB's |
3704 | knowledge of the executing state to the frontend/user running | |
3705 | state. */ | |
5b6d1e4f PA |
3706 | scoped_finish_thread_state finish_state |
3707 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 3708 | |
c906108c SS |
3709 | while (1) |
3710 | { | |
ae25568b PA |
3711 | struct execution_control_state ecss; |
3712 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 3713 | |
ae25568b PA |
3714 | memset (ecs, 0, sizeof (*ecs)); |
3715 | ||
ec9499be | 3716 | overlay_cache_invalid = 1; |
ec9499be | 3717 | |
f15cb84a YQ |
3718 | /* Flush target cache before starting to handle each event. |
3719 | Target was running and cache could be stale. This is just a | |
3720 | heuristic. Running threads may modify target memory, but we | |
3721 | don't get any event. */ | |
3722 | target_dcache_invalidate (); | |
3723 | ||
5b6d1e4f PA |
3724 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
3725 | ecs->target = inf->process_target (); | |
c906108c | 3726 | |
f00150c9 | 3727 | if (debug_infrun) |
5b6d1e4f | 3728 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3729 | |
cd0fc7c3 SS |
3730 | /* Now figure out what to do with the result of the result. */ |
3731 | handle_inferior_event (ecs); | |
c906108c | 3732 | |
cd0fc7c3 SS |
3733 | if (!ecs->wait_some_more) |
3734 | break; | |
3735 | } | |
4e1c45ea | 3736 | |
e6f5c25b | 3737 | /* No error, don't finish the state yet. */ |
731f534f | 3738 | finish_state.release (); |
cd0fc7c3 | 3739 | } |
c906108c | 3740 | |
d3d4baed PA |
3741 | /* Cleanup that reinstalls the readline callback handler, if the |
3742 | target is running in the background. If while handling the target | |
3743 | event something triggered a secondary prompt, like e.g., a | |
3744 | pagination prompt, we'll have removed the callback handler (see | |
3745 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3746 | event loop, ready to process further input. Note this has no | |
3747 | effect if the handler hasn't actually been removed, because calling | |
3748 | rl_callback_handler_install resets the line buffer, thus losing | |
3749 | input. */ | |
3750 | ||
3751 | static void | |
d238133d | 3752 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 3753 | { |
3b12939d PA |
3754 | struct ui *ui = current_ui; |
3755 | ||
3756 | if (!ui->async) | |
6c400b59 PA |
3757 | { |
3758 | /* We're not going back to the top level event loop yet. Don't | |
3759 | install the readline callback, as it'd prep the terminal, | |
3760 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3761 | it the next time the prompt is displayed, when we're ready | |
3762 | for input. */ | |
3763 | return; | |
3764 | } | |
3765 | ||
3b12939d | 3766 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3767 | gdb_rl_callback_handler_reinstall (); |
3768 | } | |
3769 | ||
243a9253 PA |
3770 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3771 | that's just the event thread. In all-stop, that's all threads. */ | |
3772 | ||
3773 | static void | |
3774 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3775 | { | |
08036331 PA |
3776 | if (ecs->event_thread != NULL |
3777 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 3778 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
3779 | |
3780 | if (!non_stop) | |
3781 | { | |
08036331 | 3782 | for (thread_info *thr : all_non_exited_threads ()) |
243a9253 PA |
3783 | { |
3784 | if (thr->thread_fsm == NULL) | |
3785 | continue; | |
3786 | if (thr == ecs->event_thread) | |
3787 | continue; | |
3788 | ||
00431a78 | 3789 | switch_to_thread (thr); |
46e3ed7f | 3790 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
3791 | } |
3792 | ||
3793 | if (ecs->event_thread != NULL) | |
00431a78 | 3794 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3795 | } |
3796 | } | |
3797 | ||
3b12939d PA |
3798 | /* Helper for all_uis_check_sync_execution_done that works on the |
3799 | current UI. */ | |
3800 | ||
3801 | static void | |
3802 | check_curr_ui_sync_execution_done (void) | |
3803 | { | |
3804 | struct ui *ui = current_ui; | |
3805 | ||
3806 | if (ui->prompt_state == PROMPT_NEEDED | |
3807 | && ui->async | |
3808 | && !gdb_in_secondary_prompt_p (ui)) | |
3809 | { | |
223ffa71 | 3810 | target_terminal::ours (); |
76727919 | 3811 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3812 | ui_register_input_event_handler (ui); |
3b12939d PA |
3813 | } |
3814 | } | |
3815 | ||
3816 | /* See infrun.h. */ | |
3817 | ||
3818 | void | |
3819 | all_uis_check_sync_execution_done (void) | |
3820 | { | |
0e454242 | 3821 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3822 | { |
3823 | check_curr_ui_sync_execution_done (); | |
3824 | } | |
3825 | } | |
3826 | ||
a8836c93 PA |
3827 | /* See infrun.h. */ |
3828 | ||
3829 | void | |
3830 | all_uis_on_sync_execution_starting (void) | |
3831 | { | |
0e454242 | 3832 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3833 | { |
3834 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3835 | async_disable_stdin (); | |
3836 | } | |
3837 | } | |
3838 | ||
1777feb0 | 3839 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3840 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3841 | descriptor corresponding to the target. It can be called more than |
3842 | once to complete a single execution command. In such cases we need | |
3843 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3844 | that this function is called for a single execution command, then |
3845 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3846 | necessary cleanups. */ |
43ff13b4 JM |
3847 | |
3848 | void | |
b1a35af2 | 3849 | fetch_inferior_event () |
43ff13b4 | 3850 | { |
0d1e5fa7 | 3851 | struct execution_control_state ecss; |
a474d7c2 | 3852 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 3853 | int cmd_done = 0; |
43ff13b4 | 3854 | |
0d1e5fa7 PA |
3855 | memset (ecs, 0, sizeof (*ecs)); |
3856 | ||
c61db772 PA |
3857 | /* Events are always processed with the main UI as current UI. This |
3858 | way, warnings, debug output, etc. are always consistently sent to | |
3859 | the main console. */ | |
4b6749b9 | 3860 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3861 | |
d3d4baed | 3862 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
3863 | { |
3864 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
3865 | ||
3866 | /* We're handling a live event, so make sure we're doing live | |
3867 | debugging. If we're looking at traceframes while the target is | |
3868 | running, we're going to need to get back to that mode after | |
3869 | handling the event. */ | |
3870 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
3871 | if (non_stop) | |
3872 | { | |
3873 | maybe_restore_traceframe.emplace (); | |
3874 | set_current_traceframe (-1); | |
3875 | } | |
43ff13b4 | 3876 | |
873657b9 PA |
3877 | /* The user/frontend should not notice a thread switch due to |
3878 | internal events. Make sure we revert to the user selected | |
3879 | thread and frame after handling the event and running any | |
3880 | breakpoint commands. */ | |
3881 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
3882 | |
3883 | overlay_cache_invalid = 1; | |
3884 | /* Flush target cache before starting to handle each event. Target | |
3885 | was running and cache could be stale. This is just a heuristic. | |
3886 | Running threads may modify target memory, but we don't get any | |
3887 | event. */ | |
3888 | target_dcache_invalidate (); | |
3889 | ||
3890 | scoped_restore save_exec_dir | |
3891 | = make_scoped_restore (&execution_direction, | |
3892 | target_execution_direction ()); | |
3893 | ||
5b6d1e4f PA |
3894 | if (!do_target_wait (minus_one_ptid, ecs, TARGET_WNOHANG)) |
3895 | return; | |
3896 | ||
3897 | gdb_assert (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3898 | ||
3899 | /* Switch to the target that generated the event, so we can do | |
3900 | target calls. Any inferior bound to the target will do, so we | |
3901 | just switch to the first we find. */ | |
3902 | for (inferior *inf : all_inferiors (ecs->target)) | |
3903 | { | |
3904 | switch_to_inferior_no_thread (inf); | |
3905 | break; | |
3906 | } | |
d238133d TT |
3907 | |
3908 | if (debug_infrun) | |
5b6d1e4f | 3909 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
d238133d TT |
3910 | |
3911 | /* If an error happens while handling the event, propagate GDB's | |
3912 | knowledge of the executing state to the frontend/user running | |
3913 | state. */ | |
3914 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 3915 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 3916 | |
979a0d13 | 3917 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
3918 | still for the thread which has thrown the exception. */ |
3919 | auto defer_bpstat_clear | |
3920 | = make_scope_exit (bpstat_clear_actions); | |
3921 | auto defer_delete_threads | |
3922 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
3923 | ||
3924 | /* Now figure out what to do with the result of the result. */ | |
3925 | handle_inferior_event (ecs); | |
3926 | ||
3927 | if (!ecs->wait_some_more) | |
3928 | { | |
5b6d1e4f | 3929 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
d238133d TT |
3930 | int should_stop = 1; |
3931 | struct thread_info *thr = ecs->event_thread; | |
d6b48e9c | 3932 | |
d238133d | 3933 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3934 | |
d238133d TT |
3935 | if (thr != NULL) |
3936 | { | |
3937 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 3938 | |
d238133d | 3939 | if (thread_fsm != NULL) |
46e3ed7f | 3940 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 3941 | } |
243a9253 | 3942 | |
d238133d TT |
3943 | if (!should_stop) |
3944 | { | |
3945 | keep_going (ecs); | |
3946 | } | |
3947 | else | |
3948 | { | |
46e3ed7f | 3949 | bool should_notify_stop = true; |
d238133d | 3950 | int proceeded = 0; |
1840d81a | 3951 | |
d238133d | 3952 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 3953 | |
d238133d | 3954 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 3955 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 3956 | |
d238133d TT |
3957 | if (should_notify_stop) |
3958 | { | |
3959 | /* We may not find an inferior if this was a process exit. */ | |
3960 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
3961 | proceeded = normal_stop (); | |
3962 | } | |
243a9253 | 3963 | |
d238133d TT |
3964 | if (!proceeded) |
3965 | { | |
b1a35af2 | 3966 | inferior_event_handler (INF_EXEC_COMPLETE); |
d238133d TT |
3967 | cmd_done = 1; |
3968 | } | |
873657b9 PA |
3969 | |
3970 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
3971 | previously selected thread is gone. We have two | |
3972 | choices - switch to no thread selected, or restore the | |
3973 | previously selected thread (now exited). We chose the | |
3974 | later, just because that's what GDB used to do. After | |
3975 | this, "info threads" says "The current thread <Thread | |
3976 | ID 2> has terminated." instead of "No thread | |
3977 | selected.". */ | |
3978 | if (!non_stop | |
3979 | && cmd_done | |
3980 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
3981 | restore_thread.dont_restore (); | |
d238133d TT |
3982 | } |
3983 | } | |
4f8d22e3 | 3984 | |
d238133d TT |
3985 | defer_delete_threads.release (); |
3986 | defer_bpstat_clear.release (); | |
29f49a6a | 3987 | |
d238133d TT |
3988 | /* No error, don't finish the thread states yet. */ |
3989 | finish_state.release (); | |
731f534f | 3990 | |
d238133d TT |
3991 | /* This scope is used to ensure that readline callbacks are |
3992 | reinstalled here. */ | |
3993 | } | |
4f8d22e3 | 3994 | |
3b12939d PA |
3995 | /* If a UI was in sync execution mode, and now isn't, restore its |
3996 | prompt (a synchronous execution command has finished, and we're | |
3997 | ready for input). */ | |
3998 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
3999 | |
4000 | if (cmd_done | |
0f641c01 | 4001 | && exec_done_display_p |
00431a78 PA |
4002 | && (inferior_ptid == null_ptid |
4003 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 4004 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
4005 | } |
4006 | ||
29734269 SM |
4007 | /* See infrun.h. */ |
4008 | ||
edb3359d | 4009 | void |
29734269 SM |
4010 | set_step_info (thread_info *tp, struct frame_info *frame, |
4011 | struct symtab_and_line sal) | |
edb3359d | 4012 | { |
29734269 SM |
4013 | /* This can be removed once this function no longer implicitly relies on the |
4014 | inferior_ptid value. */ | |
4015 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4016 | |
16c381f0 JK |
4017 | tp->control.step_frame_id = get_frame_id (frame); |
4018 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4019 | |
4020 | tp->current_symtab = sal.symtab; | |
4021 | tp->current_line = sal.line; | |
4022 | } | |
4023 | ||
0d1e5fa7 PA |
4024 | /* Clear context switchable stepping state. */ |
4025 | ||
4026 | void | |
4e1c45ea | 4027 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4028 | { |
7f5ef605 | 4029 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4030 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4031 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4032 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4033 | } |
4034 | ||
ab1ddbcf | 4035 | /* See infrun.h. */ |
c32c64b7 | 4036 | |
6efcd9a8 | 4037 | void |
5b6d1e4f PA |
4038 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
4039 | target_waitstatus status) | |
c32c64b7 | 4040 | { |
5b6d1e4f | 4041 | target_last_proc_target = target; |
c32c64b7 DE |
4042 | target_last_wait_ptid = ptid; |
4043 | target_last_waitstatus = status; | |
4044 | } | |
4045 | ||
ab1ddbcf | 4046 | /* See infrun.h. */ |
e02bc4cc DS |
4047 | |
4048 | void | |
5b6d1e4f PA |
4049 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4050 | target_waitstatus *status) | |
e02bc4cc | 4051 | { |
5b6d1e4f PA |
4052 | if (target != nullptr) |
4053 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4054 | if (ptid != nullptr) |
4055 | *ptid = target_last_wait_ptid; | |
4056 | if (status != nullptr) | |
4057 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4058 | } |
4059 | ||
ab1ddbcf PA |
4060 | /* See infrun.h. */ |
4061 | ||
ac264b3b MS |
4062 | void |
4063 | nullify_last_target_wait_ptid (void) | |
4064 | { | |
5b6d1e4f | 4065 | target_last_proc_target = nullptr; |
ac264b3b | 4066 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4067 | target_last_waitstatus = {}; |
ac264b3b MS |
4068 | } |
4069 | ||
dcf4fbde | 4070 | /* Switch thread contexts. */ |
dd80620e MS |
4071 | |
4072 | static void | |
00431a78 | 4073 | context_switch (execution_control_state *ecs) |
dd80620e | 4074 | { |
edbcda09 | 4075 | if (ecs->ptid != inferior_ptid |
5b6d1e4f PA |
4076 | && (inferior_ptid == null_ptid |
4077 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 | 4078 | { |
edbcda09 SM |
4079 | infrun_log_debug ("Switching context from %s to %s", |
4080 | target_pid_to_str (inferior_ptid).c_str (), | |
4081 | target_pid_to_str (ecs->ptid).c_str ()); | |
fd48f117 DJ |
4082 | } |
4083 | ||
00431a78 | 4084 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4085 | } |
4086 | ||
d8dd4d5f PA |
4087 | /* If the target can't tell whether we've hit breakpoints |
4088 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4089 | check whether that could have been caused by a breakpoint. If so, | |
4090 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4091 | ||
4fa8626c | 4092 | static void |
d8dd4d5f PA |
4093 | adjust_pc_after_break (struct thread_info *thread, |
4094 | struct target_waitstatus *ws) | |
4fa8626c | 4095 | { |
24a73cce UW |
4096 | struct regcache *regcache; |
4097 | struct gdbarch *gdbarch; | |
118e6252 | 4098 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4099 | |
4fa8626c DJ |
4100 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4101 | we aren't, just return. | |
9709f61c DJ |
4102 | |
4103 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4104 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4105 | implemented by software breakpoints should be handled through the normal | |
4106 | breakpoint layer. | |
8fb3e588 | 4107 | |
4fa8626c DJ |
4108 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4109 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4110 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4111 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4112 | generates these signals at breakpoints (the code has been in GDB since at | |
4113 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4114 | |
e6cf7916 UW |
4115 | In earlier versions of GDB, a target with |
4116 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4117 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4118 | target with both of these set in GDB history, and it seems unlikely to be | |
4119 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4120 | |
d8dd4d5f | 4121 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4122 | return; |
4123 | ||
d8dd4d5f | 4124 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4125 | return; |
4126 | ||
4058b839 PA |
4127 | /* In reverse execution, when a breakpoint is hit, the instruction |
4128 | under it has already been de-executed. The reported PC always | |
4129 | points at the breakpoint address, so adjusting it further would | |
4130 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4131 | architecture: | |
4132 | ||
4133 | B1 0x08000000 : INSN1 | |
4134 | B2 0x08000001 : INSN2 | |
4135 | 0x08000002 : INSN3 | |
4136 | PC -> 0x08000003 : INSN4 | |
4137 | ||
4138 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4139 | from that point should hit B2 as below. Reading the PC when the | |
4140 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4141 | been de-executed already. | |
4142 | ||
4143 | B1 0x08000000 : INSN1 | |
4144 | B2 PC -> 0x08000001 : INSN2 | |
4145 | 0x08000002 : INSN3 | |
4146 | 0x08000003 : INSN4 | |
4147 | ||
4148 | We can't apply the same logic as for forward execution, because | |
4149 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4150 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4151 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4152 | behaviour. */ | |
4153 | if (execution_direction == EXEC_REVERSE) | |
4154 | return; | |
4155 | ||
1cf4d951 PA |
4156 | /* If the target can tell whether the thread hit a SW breakpoint, |
4157 | trust it. Targets that can tell also adjust the PC | |
4158 | themselves. */ | |
4159 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4160 | return; | |
4161 | ||
4162 | /* Note that relying on whether a breakpoint is planted in memory to | |
4163 | determine this can fail. E.g,. the breakpoint could have been | |
4164 | removed since. Or the thread could have been told to step an | |
4165 | instruction the size of a breakpoint instruction, and only | |
4166 | _after_ was a breakpoint inserted at its address. */ | |
4167 | ||
24a73cce UW |
4168 | /* If this target does not decrement the PC after breakpoints, then |
4169 | we have nothing to do. */ | |
00431a78 | 4170 | regcache = get_thread_regcache (thread); |
ac7936df | 4171 | gdbarch = regcache->arch (); |
118e6252 | 4172 | |
527a273a | 4173 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4174 | if (decr_pc == 0) |
24a73cce UW |
4175 | return; |
4176 | ||
8b86c959 | 4177 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4178 | |
8aad930b AC |
4179 | /* Find the location where (if we've hit a breakpoint) the |
4180 | breakpoint would be. */ | |
118e6252 | 4181 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4182 | |
1cf4d951 PA |
4183 | /* If the target can't tell whether a software breakpoint triggered, |
4184 | fallback to figuring it out based on breakpoints we think were | |
4185 | inserted in the target, and on whether the thread was stepped or | |
4186 | continued. */ | |
4187 | ||
1c5cfe86 PA |
4188 | /* Check whether there actually is a software breakpoint inserted at |
4189 | that location. | |
4190 | ||
4191 | If in non-stop mode, a race condition is possible where we've | |
4192 | removed a breakpoint, but stop events for that breakpoint were | |
4193 | already queued and arrive later. To suppress those spurious | |
4194 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4195 | and retire them after a number of stop events are reported. Note |
4196 | this is an heuristic and can thus get confused. The real fix is | |
4197 | to get the "stopped by SW BP and needs adjustment" info out of | |
4198 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4199 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4200 | || (target_is_non_stop_p () |
4201 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4202 | { |
07036511 | 4203 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4204 | |
8213266a | 4205 | if (record_full_is_used ()) |
07036511 TT |
4206 | restore_operation_disable.emplace |
4207 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4208 | |
1c0fdd0e UW |
4209 | /* When using hardware single-step, a SIGTRAP is reported for both |
4210 | a completed single-step and a software breakpoint. Need to | |
4211 | differentiate between the two, as the latter needs adjusting | |
4212 | but the former does not. | |
4213 | ||
4214 | The SIGTRAP can be due to a completed hardware single-step only if | |
4215 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4216 | - this thread is currently being stepped |
4217 | ||
4218 | If any of these events did not occur, we must have stopped due | |
4219 | to hitting a software breakpoint, and have to back up to the | |
4220 | breakpoint address. | |
4221 | ||
4222 | As a special case, we could have hardware single-stepped a | |
4223 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4224 | we also need to back up to the breakpoint address. */ | |
4225 | ||
d8dd4d5f PA |
4226 | if (thread_has_single_step_breakpoints_set (thread) |
4227 | || !currently_stepping (thread) | |
4228 | || (thread->stepped_breakpoint | |
4229 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4230 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4231 | } |
4fa8626c DJ |
4232 | } |
4233 | ||
edb3359d DJ |
4234 | static int |
4235 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4236 | { | |
4237 | for (frame = get_prev_frame (frame); | |
4238 | frame != NULL; | |
4239 | frame = get_prev_frame (frame)) | |
4240 | { | |
4241 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4242 | return 1; | |
4243 | if (get_frame_type (frame) != INLINE_FRAME) | |
4244 | break; | |
4245 | } | |
4246 | ||
4247 | return 0; | |
4248 | } | |
4249 | ||
4a4c04f1 BE |
4250 | /* Look for an inline frame that is marked for skip. |
4251 | If PREV_FRAME is TRUE start at the previous frame, | |
4252 | otherwise start at the current frame. Stop at the | |
4253 | first non-inline frame, or at the frame where the | |
4254 | step started. */ | |
4255 | ||
4256 | static bool | |
4257 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4258 | { | |
4259 | struct frame_info *frame = get_current_frame (); | |
4260 | ||
4261 | if (prev_frame) | |
4262 | frame = get_prev_frame (frame); | |
4263 | ||
4264 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4265 | { | |
4266 | const char *fn = NULL; | |
4267 | symtab_and_line sal; | |
4268 | struct symbol *sym; | |
4269 | ||
4270 | if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id)) | |
4271 | break; | |
4272 | if (get_frame_type (frame) != INLINE_FRAME) | |
4273 | break; | |
4274 | ||
4275 | sal = find_frame_sal (frame); | |
4276 | sym = get_frame_function (frame); | |
4277 | ||
4278 | if (sym != NULL) | |
4279 | fn = sym->print_name (); | |
4280 | ||
4281 | if (sal.line != 0 | |
4282 | && function_name_is_marked_for_skip (fn, sal)) | |
4283 | return true; | |
4284 | } | |
4285 | ||
4286 | return false; | |
4287 | } | |
4288 | ||
c65d6b55 PA |
4289 | /* If the event thread has the stop requested flag set, pretend it |
4290 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4291 | target_stop). */ | |
4292 | ||
4293 | static bool | |
4294 | handle_stop_requested (struct execution_control_state *ecs) | |
4295 | { | |
4296 | if (ecs->event_thread->stop_requested) | |
4297 | { | |
4298 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4299 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4300 | handle_signal_stop (ecs); | |
4301 | return true; | |
4302 | } | |
4303 | return false; | |
4304 | } | |
4305 | ||
a96d9b2e SDJ |
4306 | /* Auxiliary function that handles syscall entry/return events. |
4307 | It returns 1 if the inferior should keep going (and GDB | |
4308 | should ignore the event), or 0 if the event deserves to be | |
4309 | processed. */ | |
ca2163eb | 4310 | |
a96d9b2e | 4311 | static int |
ca2163eb | 4312 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4313 | { |
ca2163eb | 4314 | struct regcache *regcache; |
ca2163eb PA |
4315 | int syscall_number; |
4316 | ||
00431a78 | 4317 | context_switch (ecs); |
ca2163eb | 4318 | |
00431a78 | 4319 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4320 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4321 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4322 | |
a96d9b2e SDJ |
4323 | if (catch_syscall_enabled () > 0 |
4324 | && catching_syscall_number (syscall_number) > 0) | |
4325 | { | |
edbcda09 | 4326 | infrun_log_debug ("syscall number=%d", syscall_number); |
a96d9b2e | 4327 | |
16c381f0 | 4328 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4329 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4330 | ecs->event_thread->suspend.stop_pc, |
4331 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4332 | |
c65d6b55 PA |
4333 | if (handle_stop_requested (ecs)) |
4334 | return 0; | |
4335 | ||
ce12b012 | 4336 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4337 | { |
4338 | /* Catchpoint hit. */ | |
ca2163eb PA |
4339 | return 0; |
4340 | } | |
a96d9b2e | 4341 | } |
ca2163eb | 4342 | |
c65d6b55 PA |
4343 | if (handle_stop_requested (ecs)) |
4344 | return 0; | |
4345 | ||
ca2163eb | 4346 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb PA |
4347 | keep_going (ecs); |
4348 | return 1; | |
a96d9b2e SDJ |
4349 | } |
4350 | ||
7e324e48 GB |
4351 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4352 | ||
4353 | static void | |
4354 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4355 | struct execution_control_state *ecs) | |
4356 | { | |
4357 | if (!ecs->stop_func_filled_in) | |
4358 | { | |
98a617f8 KB |
4359 | const block *block; |
4360 | ||
7e324e48 GB |
4361 | /* Don't care about return value; stop_func_start and stop_func_name |
4362 | will both be 0 if it doesn't work. */ | |
98a617f8 KB |
4363 | find_pc_partial_function (ecs->event_thread->suspend.stop_pc, |
4364 | &ecs->stop_func_name, | |
4365 | &ecs->stop_func_start, | |
4366 | &ecs->stop_func_end, | |
4367 | &block); | |
4368 | ||
4369 | /* The call to find_pc_partial_function, above, will set | |
4370 | stop_func_start and stop_func_end to the start and end | |
4371 | of the range containing the stop pc. If this range | |
4372 | contains the entry pc for the block (which is always the | |
4373 | case for contiguous blocks), advance stop_func_start past | |
4374 | the function's start offset and entrypoint. Note that | |
4375 | stop_func_start is NOT advanced when in a range of a | |
4376 | non-contiguous block that does not contain the entry pc. */ | |
4377 | if (block != nullptr | |
4378 | && ecs->stop_func_start <= BLOCK_ENTRY_PC (block) | |
4379 | && BLOCK_ENTRY_PC (block) < ecs->stop_func_end) | |
4380 | { | |
4381 | ecs->stop_func_start | |
4382 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4383 | ||
4384 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4385 | ecs->stop_func_start | |
4386 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4387 | } | |
591a12a1 | 4388 | |
7e324e48 GB |
4389 | ecs->stop_func_filled_in = 1; |
4390 | } | |
4391 | } | |
4392 | ||
4f5d7f63 | 4393 | |
00431a78 | 4394 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4395 | |
4396 | static enum stop_kind | |
00431a78 | 4397 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4398 | { |
5b6d1e4f | 4399 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4400 | |
4401 | gdb_assert (inf != NULL); | |
4402 | return inf->control.stop_soon; | |
4403 | } | |
4404 | ||
5b6d1e4f PA |
4405 | /* Poll for one event out of the current target. Store the resulting |
4406 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4407 | |
4408 | static ptid_t | |
5b6d1e4f | 4409 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4410 | { |
4411 | ptid_t event_ptid; | |
372316f1 PA |
4412 | |
4413 | overlay_cache_invalid = 1; | |
4414 | ||
4415 | /* Flush target cache before starting to handle each event. | |
4416 | Target was running and cache could be stale. This is just a | |
4417 | heuristic. Running threads may modify target memory, but we | |
4418 | don't get any event. */ | |
4419 | target_dcache_invalidate (); | |
4420 | ||
4421 | if (deprecated_target_wait_hook) | |
5b6d1e4f | 4422 | event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 | 4423 | else |
5b6d1e4f | 4424 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4425 | |
4426 | if (debug_infrun) | |
5b6d1e4f | 4427 | print_target_wait_results (minus_one_ptid, event_ptid, ws); |
372316f1 PA |
4428 | |
4429 | return event_ptid; | |
4430 | } | |
4431 | ||
5b6d1e4f PA |
4432 | /* An event reported by wait_one. */ |
4433 | ||
4434 | struct wait_one_event | |
4435 | { | |
4436 | /* The target the event came out of. */ | |
4437 | process_stratum_target *target; | |
4438 | ||
4439 | /* The PTID the event was for. */ | |
4440 | ptid_t ptid; | |
4441 | ||
4442 | /* The waitstatus. */ | |
4443 | target_waitstatus ws; | |
4444 | }; | |
4445 | ||
4446 | /* Wait for one event out of any target. */ | |
4447 | ||
4448 | static wait_one_event | |
4449 | wait_one () | |
4450 | { | |
4451 | while (1) | |
4452 | { | |
4453 | for (inferior *inf : all_inferiors ()) | |
4454 | { | |
4455 | process_stratum_target *target = inf->process_target (); | |
4456 | if (target == NULL | |
4457 | || !target->is_async_p () | |
4458 | || !target->threads_executing) | |
4459 | continue; | |
4460 | ||
4461 | switch_to_inferior_no_thread (inf); | |
4462 | ||
4463 | wait_one_event event; | |
4464 | event.target = target; | |
4465 | event.ptid = poll_one_curr_target (&event.ws); | |
4466 | ||
4467 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4468 | { | |
4469 | /* If nothing is resumed, remove the target from the | |
4470 | event loop. */ | |
4471 | target_async (0); | |
4472 | } | |
4473 | else if (event.ws.kind != TARGET_WAITKIND_IGNORE) | |
4474 | return event; | |
4475 | } | |
4476 | ||
4477 | /* Block waiting for some event. */ | |
4478 | ||
4479 | fd_set readfds; | |
4480 | int nfds = 0; | |
4481 | ||
4482 | FD_ZERO (&readfds); | |
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 | int fd = target->async_wait_fd (); | |
4493 | FD_SET (fd, &readfds); | |
4494 | if (nfds <= fd) | |
4495 | nfds = fd + 1; | |
4496 | } | |
4497 | ||
4498 | if (nfds == 0) | |
4499 | { | |
4500 | /* No waitable targets left. All must be stopped. */ | |
4501 | return {NULL, minus_one_ptid, {TARGET_WAITKIND_NO_RESUMED}}; | |
4502 | } | |
4503 | ||
4504 | QUIT; | |
4505 | ||
4506 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4507 | if (numfds < 0) | |
4508 | { | |
4509 | if (errno == EINTR) | |
4510 | continue; | |
4511 | else | |
4512 | perror_with_name ("interruptible_select"); | |
4513 | } | |
4514 | } | |
4515 | } | |
4516 | ||
372316f1 PA |
4517 | /* Save the thread's event and stop reason to process it later. */ |
4518 | ||
4519 | static void | |
5b6d1e4f | 4520 | save_waitstatus (struct thread_info *tp, const target_waitstatus *ws) |
372316f1 | 4521 | { |
edbcda09 SM |
4522 | infrun_log_debug ("saving status %s for %d.%ld.%ld", |
4523 | target_waitstatus_to_string (ws).c_str (), | |
4524 | tp->ptid.pid (), | |
4525 | tp->ptid.lwp (), | |
4526 | tp->ptid.tid ()); | |
372316f1 PA |
4527 | |
4528 | /* Record for later. */ | |
4529 | tp->suspend.waitstatus = *ws; | |
4530 | tp->suspend.waitstatus_pending_p = 1; | |
4531 | ||
00431a78 | 4532 | struct regcache *regcache = get_thread_regcache (tp); |
8b86c959 | 4533 | const address_space *aspace = regcache->aspace (); |
372316f1 PA |
4534 | |
4535 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4536 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4537 | { | |
4538 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4539 | ||
4540 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4541 | ||
18493a00 PA |
4542 | scoped_restore_current_thread restore_thread; |
4543 | switch_to_thread (tp); | |
4544 | ||
4545 | if (target_stopped_by_watchpoint ()) | |
372316f1 PA |
4546 | { |
4547 | tp->suspend.stop_reason | |
4548 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4549 | } | |
4550 | else if (target_supports_stopped_by_sw_breakpoint () | |
18493a00 | 4551 | && target_stopped_by_sw_breakpoint ()) |
372316f1 PA |
4552 | { |
4553 | tp->suspend.stop_reason | |
4554 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4555 | } | |
4556 | else if (target_supports_stopped_by_hw_breakpoint () | |
18493a00 | 4557 | && target_stopped_by_hw_breakpoint ()) |
372316f1 PA |
4558 | { |
4559 | tp->suspend.stop_reason | |
4560 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4561 | } | |
4562 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4563 | && hardware_breakpoint_inserted_here_p (aspace, | |
4564 | pc)) | |
4565 | { | |
4566 | tp->suspend.stop_reason | |
4567 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4568 | } | |
4569 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4570 | && software_breakpoint_inserted_here_p (aspace, | |
4571 | pc)) | |
4572 | { | |
4573 | tp->suspend.stop_reason | |
4574 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4575 | } | |
4576 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4577 | && currently_stepping (tp)) | |
4578 | { | |
4579 | tp->suspend.stop_reason | |
4580 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4581 | } | |
4582 | } | |
4583 | } | |
4584 | ||
293b3ebc TBA |
4585 | /* Mark the non-executing threads accordingly. In all-stop, all |
4586 | threads of all processes are stopped when we get any event | |
4587 | reported. In non-stop mode, only the event thread stops. */ | |
4588 | ||
4589 | static void | |
4590 | mark_non_executing_threads (process_stratum_target *target, | |
4591 | ptid_t event_ptid, | |
4592 | struct target_waitstatus ws) | |
4593 | { | |
4594 | ptid_t mark_ptid; | |
4595 | ||
4596 | if (!target_is_non_stop_p ()) | |
4597 | mark_ptid = minus_one_ptid; | |
4598 | else if (ws.kind == TARGET_WAITKIND_SIGNALLED | |
4599 | || ws.kind == TARGET_WAITKIND_EXITED) | |
4600 | { | |
4601 | /* If we're handling a process exit in non-stop mode, even | |
4602 | though threads haven't been deleted yet, one would think | |
4603 | that there is nothing to do, as threads of the dead process | |
4604 | will be soon deleted, and threads of any other process were | |
4605 | left running. However, on some targets, threads survive a | |
4606 | process exit event. E.g., for the "checkpoint" command, | |
4607 | when the current checkpoint/fork exits, linux-fork.c | |
4608 | automatically switches to another fork from within | |
4609 | target_mourn_inferior, by associating the same | |
4610 | inferior/thread to another fork. We haven't mourned yet at | |
4611 | this point, but we must mark any threads left in the | |
4612 | process as not-executing so that finish_thread_state marks | |
4613 | them stopped (in the user's perspective) if/when we present | |
4614 | the stop to the user. */ | |
4615 | mark_ptid = ptid_t (event_ptid.pid ()); | |
4616 | } | |
4617 | else | |
4618 | mark_ptid = event_ptid; | |
4619 | ||
4620 | set_executing (target, mark_ptid, false); | |
4621 | ||
4622 | /* Likewise the resumed flag. */ | |
4623 | set_resumed (target, mark_ptid, false); | |
4624 | } | |
4625 | ||
6efcd9a8 | 4626 | /* See infrun.h. */ |
372316f1 | 4627 | |
6efcd9a8 | 4628 | void |
372316f1 PA |
4629 | stop_all_threads (void) |
4630 | { | |
4631 | /* We may need multiple passes to discover all threads. */ | |
4632 | int pass; | |
4633 | int iterations = 0; | |
372316f1 | 4634 | |
53cccef1 | 4635 | gdb_assert (exists_non_stop_target ()); |
372316f1 | 4636 | |
edbcda09 | 4637 | infrun_log_debug ("stop_all_threads"); |
372316f1 | 4638 | |
00431a78 | 4639 | scoped_restore_current_thread restore_thread; |
372316f1 | 4640 | |
6ad82919 TBA |
4641 | /* Enable thread events of all targets. */ |
4642 | for (auto *target : all_non_exited_process_targets ()) | |
4643 | { | |
4644 | switch_to_target_no_thread (target); | |
4645 | target_thread_events (true); | |
4646 | } | |
4647 | ||
4648 | SCOPE_EXIT | |
4649 | { | |
4650 | /* Disable thread events of all targets. */ | |
4651 | for (auto *target : all_non_exited_process_targets ()) | |
4652 | { | |
4653 | switch_to_target_no_thread (target); | |
4654 | target_thread_events (false); | |
4655 | } | |
4656 | ||
edbcda09 SM |
4657 | |
4658 | infrun_log_debug ("stop_all_threads done"); | |
6ad82919 | 4659 | }; |
65706a29 | 4660 | |
372316f1 PA |
4661 | /* Request threads to stop, and then wait for the stops. Because |
4662 | threads we already know about can spawn more threads while we're | |
4663 | trying to stop them, and we only learn about new threads when we | |
4664 | update the thread list, do this in a loop, and keep iterating | |
4665 | until two passes find no threads that need to be stopped. */ | |
4666 | for (pass = 0; pass < 2; pass++, iterations++) | |
4667 | { | |
edbcda09 SM |
4668 | infrun_log_debug ("stop_all_threads, pass=%d, iterations=%d", |
4669 | pass, iterations); | |
372316f1 PA |
4670 | while (1) |
4671 | { | |
29d6859f | 4672 | int waits_needed = 0; |
372316f1 | 4673 | |
a05575d3 TBA |
4674 | for (auto *target : all_non_exited_process_targets ()) |
4675 | { | |
4676 | switch_to_target_no_thread (target); | |
4677 | update_thread_list (); | |
4678 | } | |
372316f1 PA |
4679 | |
4680 | /* Go through all threads looking for threads that we need | |
4681 | to tell the target to stop. */ | |
08036331 | 4682 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 4683 | { |
53cccef1 TBA |
4684 | /* For a single-target setting with an all-stop target, |
4685 | we would not even arrive here. For a multi-target | |
4686 | setting, until GDB is able to handle a mixture of | |
4687 | all-stop and non-stop targets, simply skip all-stop | |
4688 | targets' threads. This should be fine due to the | |
4689 | protection of 'check_multi_target_resumption'. */ | |
4690 | ||
4691 | switch_to_thread_no_regs (t); | |
4692 | if (!target_is_non_stop_p ()) | |
4693 | continue; | |
4694 | ||
372316f1 PA |
4695 | if (t->executing) |
4696 | { | |
4697 | /* If already stopping, don't request a stop again. | |
4698 | We just haven't seen the notification yet. */ | |
4699 | if (!t->stop_requested) | |
4700 | { | |
edbcda09 SM |
4701 | infrun_log_debug (" %s executing, need stop", |
4702 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4703 | target_stop (t->ptid); |
4704 | t->stop_requested = 1; | |
4705 | } | |
4706 | else | |
4707 | { | |
edbcda09 SM |
4708 | infrun_log_debug (" %s executing, already stopping", |
4709 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4710 | } |
4711 | ||
4712 | if (t->stop_requested) | |
29d6859f | 4713 | waits_needed++; |
372316f1 PA |
4714 | } |
4715 | else | |
4716 | { | |
edbcda09 SM |
4717 | infrun_log_debug (" %s not executing", |
4718 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4719 | |
4720 | /* The thread may be not executing, but still be | |
4721 | resumed with a pending status to process. */ | |
719546c4 | 4722 | t->resumed = false; |
372316f1 PA |
4723 | } |
4724 | } | |
4725 | ||
29d6859f | 4726 | if (waits_needed == 0) |
372316f1 PA |
4727 | break; |
4728 | ||
4729 | /* If we find new threads on the second iteration, restart | |
4730 | over. We want to see two iterations in a row with all | |
4731 | threads stopped. */ | |
4732 | if (pass > 0) | |
4733 | pass = -1; | |
4734 | ||
29d6859f | 4735 | for (int i = 0; i < waits_needed; i++) |
c29705b7 | 4736 | { |
29d6859f | 4737 | wait_one_event event = wait_one (); |
a05575d3 | 4738 | |
edbcda09 SM |
4739 | infrun_log_debug ("%s %s\n", |
4740 | target_waitstatus_to_string (&event.ws).c_str (), | |
4741 | target_pid_to_str (event.ptid).c_str ()); | |
a05575d3 | 4742 | |
29d6859f | 4743 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) |
a05575d3 | 4744 | { |
29d6859f LM |
4745 | /* All resumed threads exited. */ |
4746 | break; | |
a05575d3 | 4747 | } |
29d6859f LM |
4748 | else if (event.ws.kind == TARGET_WAITKIND_THREAD_EXITED |
4749 | || event.ws.kind == TARGET_WAITKIND_EXITED | |
4750 | || event.ws.kind == TARGET_WAITKIND_SIGNALLED) | |
6efcd9a8 | 4751 | { |
29d6859f | 4752 | /* One thread/process exited/signalled. */ |
6efcd9a8 | 4753 | |
29d6859f | 4754 | thread_info *t = nullptr; |
372316f1 | 4755 | |
29d6859f LM |
4756 | /* The target may have reported just a pid. If so, try |
4757 | the first non-exited thread. */ | |
4758 | if (event.ptid.is_pid ()) | |
372316f1 | 4759 | { |
29d6859f LM |
4760 | int pid = event.ptid.pid (); |
4761 | inferior *inf = find_inferior_pid (event.target, pid); | |
4762 | for (thread_info *tp : inf->non_exited_threads ()) | |
372316f1 | 4763 | { |
29d6859f LM |
4764 | t = tp; |
4765 | break; | |
372316f1 | 4766 | } |
29d6859f LM |
4767 | |
4768 | /* If there is no available thread, the event would | |
4769 | have to be appended to a per-inferior event list, | |
4770 | which does not exist (and if it did, we'd have | |
4771 | to adjust run control command to be able to | |
4772 | resume such an inferior). We assert here instead | |
4773 | of going into an infinite loop. */ | |
4774 | gdb_assert (t != nullptr); | |
4775 | ||
edbcda09 SM |
4776 | infrun_log_debug ("using %s\n", |
4777 | target_pid_to_str (t->ptid).c_str ()); | |
29d6859f LM |
4778 | } |
4779 | else | |
4780 | { | |
4781 | t = find_thread_ptid (event.target, event.ptid); | |
4782 | /* Check if this is the first time we see this thread. | |
4783 | Don't bother adding if it individually exited. */ | |
4784 | if (t == nullptr | |
4785 | && event.ws.kind != TARGET_WAITKIND_THREAD_EXITED) | |
4786 | t = add_thread (event.target, event.ptid); | |
4787 | } | |
4788 | ||
4789 | if (t != nullptr) | |
4790 | { | |
4791 | /* Set the threads as non-executing to avoid | |
4792 | another stop attempt on them. */ | |
4793 | switch_to_thread_no_regs (t); | |
4794 | mark_non_executing_threads (event.target, event.ptid, | |
4795 | event.ws); | |
4796 | save_waitstatus (t, &event.ws); | |
4797 | t->stop_requested = false; | |
372316f1 PA |
4798 | } |
4799 | } | |
4800 | else | |
4801 | { | |
29d6859f LM |
4802 | thread_info *t = find_thread_ptid (event.target, event.ptid); |
4803 | if (t == NULL) | |
4804 | t = add_thread (event.target, event.ptid); | |
372316f1 | 4805 | |
29d6859f LM |
4806 | t->stop_requested = 0; |
4807 | t->executing = 0; | |
4808 | t->resumed = false; | |
4809 | t->control.may_range_step = 0; | |
4810 | ||
4811 | /* This may be the first time we see the inferior report | |
4812 | a stop. */ | |
4813 | inferior *inf = find_inferior_ptid (event.target, event.ptid); | |
4814 | if (inf->needs_setup) | |
372316f1 | 4815 | { |
29d6859f LM |
4816 | switch_to_thread_no_regs (t); |
4817 | setup_inferior (0); | |
372316f1 PA |
4818 | } |
4819 | ||
29d6859f LM |
4820 | if (event.ws.kind == TARGET_WAITKIND_STOPPED |
4821 | && event.ws.value.sig == GDB_SIGNAL_0) | |
372316f1 | 4822 | { |
29d6859f LM |
4823 | /* We caught the event that we intended to catch, so |
4824 | there's no event pending. */ | |
4825 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4826 | t->suspend.waitstatus_pending_p = 0; | |
4827 | ||
9844051a | 4828 | if (displaced_step_finish (t, GDB_SIGNAL_0) < 0) |
29d6859f LM |
4829 | { |
4830 | /* Add it back to the step-over queue. */ | |
edbcda09 SM |
4831 | infrun_log_debug ("displaced-step of %s " |
4832 | "canceled: adding back to the " | |
4833 | "step-over queue\n", | |
4834 | target_pid_to_str (t->ptid).c_str ()); | |
4835 | ||
29d6859f | 4836 | t->control.trap_expected = 0; |
7bd43605 | 4837 | global_thread_step_over_chain_enqueue (t); |
29d6859f | 4838 | } |
372316f1 | 4839 | } |
29d6859f LM |
4840 | else |
4841 | { | |
4842 | enum gdb_signal sig; | |
4843 | struct regcache *regcache; | |
372316f1 | 4844 | |
29d6859f LM |
4845 | if (debug_infrun) |
4846 | { | |
4847 | std::string statstr = target_waitstatus_to_string (&event.ws); | |
372316f1 | 4848 | |
edbcda09 SM |
4849 | infrun_log_debug ("target_wait %s, saving " |
4850 | "status for %d.%ld.%ld\n", | |
4851 | statstr.c_str (), | |
4852 | t->ptid.pid (), | |
4853 | t->ptid.lwp (), | |
4854 | t->ptid.tid ()); | |
29d6859f LM |
4855 | } |
4856 | ||
4857 | /* Record for later. */ | |
4858 | save_waitstatus (t, &event.ws); | |
4859 | ||
4860 | sig = (event.ws.kind == TARGET_WAITKIND_STOPPED | |
4861 | ? event.ws.value.sig : GDB_SIGNAL_0); | |
4862 | ||
9844051a | 4863 | if (displaced_step_finish (t, sig) < 0) |
29d6859f LM |
4864 | { |
4865 | /* Add it back to the step-over queue. */ | |
4866 | t->control.trap_expected = 0; | |
7bd43605 | 4867 | global_thread_step_over_chain_enqueue (t); |
29d6859f LM |
4868 | } |
4869 | ||
4870 | regcache = get_thread_regcache (t); | |
4871 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4872 | ||
edbcda09 SM |
4873 | infrun_log_debug ("saved stop_pc=%s for %s " |
4874 | "(currently_stepping=%d)\n", | |
4875 | paddress (target_gdbarch (), | |
4876 | t->suspend.stop_pc), | |
4877 | target_pid_to_str (t->ptid).c_str (), | |
4878 | currently_stepping (t)); | |
372316f1 PA |
4879 | } |
4880 | } | |
4881 | } | |
4882 | } | |
4883 | } | |
372316f1 PA |
4884 | } |
4885 | ||
f4836ba9 PA |
4886 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4887 | ||
4888 | static int | |
4889 | handle_no_resumed (struct execution_control_state *ecs) | |
4890 | { | |
3b12939d | 4891 | if (target_can_async_p ()) |
f4836ba9 | 4892 | { |
3b12939d | 4893 | int any_sync = 0; |
f4836ba9 | 4894 | |
2dab0c7b | 4895 | for (ui *ui : all_uis ()) |
3b12939d PA |
4896 | { |
4897 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4898 | { | |
4899 | any_sync = 1; | |
4900 | break; | |
4901 | } | |
4902 | } | |
4903 | if (!any_sync) | |
4904 | { | |
4905 | /* There were no unwaited-for children left in the target, but, | |
4906 | we're not synchronously waiting for events either. Just | |
4907 | ignore. */ | |
4908 | ||
edbcda09 | 4909 | infrun_log_debug ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)"); |
3b12939d PA |
4910 | prepare_to_wait (ecs); |
4911 | return 1; | |
4912 | } | |
f4836ba9 PA |
4913 | } |
4914 | ||
4915 | /* Otherwise, if we were running a synchronous execution command, we | |
4916 | may need to cancel it and give the user back the terminal. | |
4917 | ||
4918 | In non-stop mode, the target can't tell whether we've already | |
4919 | consumed previous stop events, so it can end up sending us a | |
4920 | no-resumed event like so: | |
4921 | ||
4922 | #0 - thread 1 is left stopped | |
4923 | ||
4924 | #1 - thread 2 is resumed and hits breakpoint | |
4925 | -> TARGET_WAITKIND_STOPPED | |
4926 | ||
4927 | #2 - thread 3 is resumed and exits | |
4928 | this is the last resumed thread, so | |
4929 | -> TARGET_WAITKIND_NO_RESUMED | |
4930 | ||
4931 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4932 | it. | |
4933 | ||
4934 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4935 | thread 2 is now resumed, so the event should be ignored. | |
4936 | ||
4937 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4938 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4939 | event. But it could be that the event meant that thread 2 itself | |
4940 | (or whatever other thread was the last resumed thread) exited. | |
4941 | ||
4942 | To address this we refresh the thread list and check whether we | |
4943 | have resumed threads _now_. In the example above, this removes | |
4944 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4945 | ignore this event. If we find no thread resumed, then we cancel | |
2ec0f7ff PA |
4946 | the synchronous command and show "no unwaited-for " to the |
4947 | user. */ | |
f4836ba9 | 4948 | |
aecd6cb8 | 4949 | inferior *curr_inf = current_inferior (); |
2ec0f7ff | 4950 | |
aecd6cb8 PA |
4951 | scoped_restore_current_thread restore_thread; |
4952 | ||
4953 | for (auto *target : all_non_exited_process_targets ()) | |
4954 | { | |
4955 | switch_to_target_no_thread (target); | |
4956 | update_thread_list (); | |
4957 | } | |
4958 | ||
4959 | /* If: | |
4960 | ||
4961 | - the current target has no thread executing, and | |
4962 | - the current inferior is native, and | |
4963 | - the current inferior is the one which has the terminal, and | |
4964 | - we did nothing, | |
4965 | ||
4966 | then a Ctrl-C from this point on would remain stuck in the | |
4967 | kernel, until a thread resumes and dequeues it. That would | |
4968 | result in the GDB CLI not reacting to Ctrl-C, not able to | |
4969 | interrupt the program. To address this, if the current inferior | |
4970 | no longer has any thread executing, we give the terminal to some | |
4971 | other inferior that has at least one thread executing. */ | |
4972 | bool swap_terminal = true; | |
4973 | ||
4974 | /* Whether to ignore this TARGET_WAITKIND_NO_RESUMED event, or | |
4975 | whether to report it to the user. */ | |
4976 | bool ignore_event = false; | |
2ec0f7ff PA |
4977 | |
4978 | for (thread_info *thread : all_non_exited_threads ()) | |
f4836ba9 | 4979 | { |
aecd6cb8 PA |
4980 | if (swap_terminal && thread->executing) |
4981 | { | |
4982 | if (thread->inf != curr_inf) | |
4983 | { | |
4984 | target_terminal::ours (); | |
4985 | ||
4986 | switch_to_thread (thread); | |
4987 | target_terminal::inferior (); | |
4988 | } | |
4989 | swap_terminal = false; | |
4990 | } | |
4991 | ||
4992 | if (!ignore_event | |
4993 | && (thread->executing | |
4994 | || thread->suspend.waitstatus_pending_p)) | |
f4836ba9 | 4995 | { |
2ec0f7ff PA |
4996 | /* Either there were no unwaited-for children left in the |
4997 | target at some point, but there are now, or some target | |
4998 | other than the eventing one has unwaited-for children | |
4999 | left. Just ignore. */ | |
edbcda09 SM |
5000 | infrun_log_debug ("TARGET_WAITKIND_NO_RESUMED " |
5001 | "(ignoring: found resumed)\n"); | |
aecd6cb8 PA |
5002 | |
5003 | ignore_event = true; | |
f4836ba9 | 5004 | } |
aecd6cb8 PA |
5005 | |
5006 | if (ignore_event && !swap_terminal) | |
5007 | break; | |
5008 | } | |
5009 | ||
5010 | if (ignore_event) | |
5011 | { | |
5012 | switch_to_inferior_no_thread (curr_inf); | |
5013 | prepare_to_wait (ecs); | |
5014 | return 1; | |
f4836ba9 PA |
5015 | } |
5016 | ||
5017 | /* Go ahead and report the event. */ | |
5018 | return 0; | |
5019 | } | |
5020 | ||
05ba8510 PA |
5021 | /* Given an execution control state that has been freshly filled in by |
5022 | an event from the inferior, figure out what it means and take | |
5023 | appropriate action. | |
5024 | ||
5025 | The alternatives are: | |
5026 | ||
22bcd14b | 5027 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5028 | debugger. |
5029 | ||
5030 | 2) keep_going and return; to wait for the next event (set | |
5031 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5032 | once). */ | |
c906108c | 5033 | |
ec9499be | 5034 | static void |
595915c1 | 5035 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5036 | { |
595915c1 TT |
5037 | /* Make sure that all temporary struct value objects that were |
5038 | created during the handling of the event get deleted at the | |
5039 | end. */ | |
5040 | scoped_value_mark free_values; | |
5041 | ||
d6b48e9c PA |
5042 | enum stop_kind stop_soon; |
5043 | ||
edbcda09 | 5044 | infrun_log_debug ("%s", target_waitstatus_to_string (&ecs->ws).c_str ()); |
c29705b7 | 5045 | |
28736962 PA |
5046 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
5047 | { | |
5048 | /* We had an event in the inferior, but we are not interested in | |
5049 | handling it at this level. The lower layers have already | |
5050 | done what needs to be done, if anything. | |
5051 | ||
5052 | One of the possible circumstances for this is when the | |
5053 | inferior produces output for the console. The inferior has | |
5054 | not stopped, and we are ignoring the event. Another possible | |
5055 | circumstance is any event which the lower level knows will be | |
5056 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5057 | prepare_to_wait (ecs); |
5058 | return; | |
5059 | } | |
5060 | ||
65706a29 PA |
5061 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
5062 | { | |
65706a29 PA |
5063 | prepare_to_wait (ecs); |
5064 | return; | |
5065 | } | |
5066 | ||
0e5bf2a8 | 5067 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5068 | && handle_no_resumed (ecs)) |
5069 | return; | |
0e5bf2a8 | 5070 | |
5b6d1e4f PA |
5071 | /* Cache the last target/ptid/waitstatus. */ |
5072 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5073 | |
ca005067 | 5074 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5075 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5076 | |
0e5bf2a8 PA |
5077 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
5078 | { | |
5079 | /* No unwaited-for children left. IOW, all resumed children | |
5080 | have exited. */ | |
0e5bf2a8 | 5081 | stop_print_frame = 0; |
22bcd14b | 5082 | stop_waiting (ecs); |
0e5bf2a8 PA |
5083 | return; |
5084 | } | |
5085 | ||
8c90c137 | 5086 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 5087 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 | 5088 | { |
5b6d1e4f | 5089 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5090 | /* If it's a new thread, add it to the thread database. */ |
5091 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5092 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5093 | |
5094 | /* Disable range stepping. If the next step request could use a | |
5095 | range, this will be end up re-enabled then. */ | |
5096 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5097 | } |
88ed393a JK |
5098 | |
5099 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 5100 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
5101 | |
5102 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5103 | reinit_frame_cache (); | |
5104 | ||
28736962 PA |
5105 | breakpoint_retire_moribund (); |
5106 | ||
2b009048 DJ |
5107 | /* First, distinguish signals caused by the debugger from signals |
5108 | that have to do with the program's own actions. Note that | |
5109 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5110 | on the operating system version. Here we detect when a SIGILL or | |
5111 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5112 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5113 | when we're trying to execute a breakpoint instruction on a | |
5114 | non-executable stack. This happens for call dummy breakpoints | |
5115 | for architectures like SPARC that place call dummies on the | |
5116 | stack. */ | |
2b009048 | 5117 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
5118 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
5119 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
5120 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 5121 | { |
00431a78 | 5122 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5123 | |
a01bda52 | 5124 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5125 | regcache_read_pc (regcache))) |
5126 | { | |
edbcda09 | 5127 | infrun_log_debug ("Treating signal as SIGTRAP"); |
a493e3e2 | 5128 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 5129 | } |
2b009048 DJ |
5130 | } |
5131 | ||
293b3ebc | 5132 | mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws); |
8c90c137 | 5133 | |
488f131b JB |
5134 | switch (ecs->ws.kind) |
5135 | { | |
5136 | case TARGET_WAITKIND_LOADED: | |
00431a78 | 5137 | context_switch (ecs); |
b0f4b84b DJ |
5138 | /* Ignore gracefully during startup of the inferior, as it might |
5139 | be the shell which has just loaded some objects, otherwise | |
5140 | add the symbols for the newly loaded objects. Also ignore at | |
5141 | the beginning of an attach or remote session; we will query | |
5142 | the full list of libraries once the connection is | |
5143 | established. */ | |
4f5d7f63 | 5144 | |
00431a78 | 5145 | stop_soon = get_inferior_stop_soon (ecs); |
c0236d92 | 5146 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 5147 | { |
edcc5120 TT |
5148 | struct regcache *regcache; |
5149 | ||
00431a78 | 5150 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 TT |
5151 | |
5152 | handle_solib_event (); | |
5153 | ||
5154 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 5155 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
5156 | ecs->event_thread->suspend.stop_pc, |
5157 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 5158 | |
c65d6b55 PA |
5159 | if (handle_stop_requested (ecs)) |
5160 | return; | |
5161 | ||
ce12b012 | 5162 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
5163 | { |
5164 | /* A catchpoint triggered. */ | |
94c57d6a PA |
5165 | process_event_stop_test (ecs); |
5166 | return; | |
edcc5120 | 5167 | } |
488f131b | 5168 | |
b0f4b84b DJ |
5169 | /* If requested, stop when the dynamic linker notifies |
5170 | gdb of events. This allows the user to get control | |
5171 | and place breakpoints in initializer routines for | |
5172 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 5173 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
5174 | if (stop_on_solib_events) |
5175 | { | |
55409f9d DJ |
5176 | /* Make sure we print "Stopped due to solib-event" in |
5177 | normal_stop. */ | |
5178 | stop_print_frame = 1; | |
5179 | ||
22bcd14b | 5180 | stop_waiting (ecs); |
b0f4b84b DJ |
5181 | return; |
5182 | } | |
488f131b | 5183 | } |
b0f4b84b DJ |
5184 | |
5185 | /* If we are skipping through a shell, or through shared library | |
5186 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 5187 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
5188 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
5189 | { | |
74960c60 VP |
5190 | /* Loading of shared libraries might have changed breakpoint |
5191 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 5192 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 5193 | insert_breakpoints (); |
64ce06e4 | 5194 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
5195 | prepare_to_wait (ecs); |
5196 | return; | |
5197 | } | |
5198 | ||
5c09a2c5 PA |
5199 | /* But stop if we're attaching or setting up a remote |
5200 | connection. */ | |
5201 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5202 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5203 | { | |
edbcda09 | 5204 | infrun_log_debug ("quietly stopped"); |
22bcd14b | 5205 | stop_waiting (ecs); |
5c09a2c5 PA |
5206 | return; |
5207 | } | |
5208 | ||
5209 | internal_error (__FILE__, __LINE__, | |
5210 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 5211 | |
488f131b | 5212 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5213 | if (handle_stop_requested (ecs)) |
5214 | return; | |
00431a78 | 5215 | context_switch (ecs); |
64ce06e4 | 5216 | resume (GDB_SIGNAL_0); |
488f131b JB |
5217 | prepare_to_wait (ecs); |
5218 | return; | |
c5aa993b | 5219 | |
65706a29 | 5220 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5221 | if (handle_stop_requested (ecs)) |
5222 | return; | |
00431a78 | 5223 | context_switch (ecs); |
65706a29 PA |
5224 | if (!switch_back_to_stepped_thread (ecs)) |
5225 | keep_going (ecs); | |
5226 | return; | |
5227 | ||
488f131b | 5228 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5229 | case TARGET_WAITKIND_SIGNALLED: |
18493a00 PA |
5230 | { |
5231 | /* Depending on the system, ecs->ptid may point to a thread or | |
5232 | to a process. On some targets, target_mourn_inferior may | |
5233 | need to have access to the just-exited thread. That is the | |
5234 | case of GNU/Linux's "checkpoint" support, for example. | |
5235 | Call the switch_to_xxx routine as appropriate. */ | |
5236 | thread_info *thr = find_thread_ptid (ecs->target, ecs->ptid); | |
5237 | if (thr != nullptr) | |
5238 | switch_to_thread (thr); | |
5239 | else | |
5240 | { | |
5241 | inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); | |
5242 | switch_to_inferior_no_thread (inf); | |
5243 | } | |
5244 | } | |
6c95b8df | 5245 | handle_vfork_child_exec_or_exit (0); |
223ffa71 | 5246 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5247 | |
0c557179 SDJ |
5248 | /* Clearing any previous state of convenience variables. */ |
5249 | clear_exit_convenience_vars (); | |
5250 | ||
940c3c06 PA |
5251 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5252 | { | |
5253 | /* Record the exit code in the convenience variable $_exitcode, so | |
5254 | that the user can inspect this again later. */ | |
5255 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5256 | (LONGEST) ecs->ws.value.integer); | |
5257 | ||
5258 | /* Also record this in the inferior itself. */ | |
5259 | current_inferior ()->has_exit_code = 1; | |
5260 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5261 | |
98eb56a4 PA |
5262 | /* Support the --return-child-result option. */ |
5263 | return_child_result_value = ecs->ws.value.integer; | |
5264 | ||
76727919 | 5265 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
5266 | } |
5267 | else | |
0c557179 | 5268 | { |
00431a78 | 5269 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5270 | |
5271 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5272 | { | |
5273 | /* Set the value of the internal variable $_exitsignal, | |
5274 | which holds the signal uncaught by the inferior. */ | |
5275 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5276 | gdbarch_gdb_signal_to_target (gdbarch, | |
5277 | ecs->ws.value.sig)); | |
5278 | } | |
5279 | else | |
5280 | { | |
5281 | /* We don't have access to the target's method used for | |
5282 | converting between signal numbers (GDB's internal | |
5283 | representation <-> target's representation). | |
5284 | Therefore, we cannot do a good job at displaying this | |
5285 | information to the user. It's better to just warn | |
5286 | her about it (if infrun debugging is enabled), and | |
5287 | give up. */ | |
edbcda09 SM |
5288 | infrun_log_debug ("Cannot fill $_exitsignal with the correct " |
5289 | "signal number."); | |
0c557179 SDJ |
5290 | } |
5291 | ||
76727919 | 5292 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 5293 | } |
8cf64490 | 5294 | |
488f131b | 5295 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5296 | target_mourn_inferior (inferior_ptid); |
488f131b | 5297 | stop_print_frame = 0; |
22bcd14b | 5298 | stop_waiting (ecs); |
488f131b | 5299 | return; |
c5aa993b | 5300 | |
488f131b | 5301 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5302 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5303 | /* Check whether the inferior is displaced stepping. */ |
5304 | { | |
00431a78 | 5305 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5306 | struct gdbarch *gdbarch = regcache->arch (); |
e2d96639 YQ |
5307 | |
5308 | /* If checking displaced stepping is supported, and thread | |
5309 | ecs->ptid is displaced stepping. */ | |
9844051a | 5310 | if (displaced_step_in_progress (ecs->event_thread)) |
e2d96639 YQ |
5311 | { |
5312 | struct inferior *parent_inf | |
5b6d1e4f | 5313 | = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 YQ |
5314 | struct regcache *child_regcache; |
5315 | CORE_ADDR parent_pc; | |
5316 | ||
d8d83535 SM |
5317 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) |
5318 | { | |
9844051a SM |
5319 | // struct displaced_step_inferior_state *displaced |
5320 | // = get_displaced_stepping_state (parent_inf); | |
d8d83535 SM |
5321 | |
5322 | /* Restore scratch pad for child process. */ | |
9844051a SM |
5323 | //displaced_step_restore (displaced, ecs->ws.value.related_pid); |
5324 | // FIXME: we should restore all the buffers that were currently in use | |
d8d83535 SM |
5325 | } |
5326 | ||
e2d96639 YQ |
5327 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, |
5328 | indicating that the displaced stepping of syscall instruction | |
5329 | has been done. Perform cleanup for parent process here. Note | |
5330 | that this operation also cleans up the child process for vfork, | |
5331 | because their pages are shared. */ | |
9844051a | 5332 | displaced_step_finish (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5333 | /* Start a new step-over in another thread if there's one |
5334 | that needs it. */ | |
5335 | start_step_over (); | |
e2d96639 | 5336 | |
e2d96639 YQ |
5337 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5338 | the child's PC is also within the scratchpad. Set the child's PC | |
5339 | to the parent's PC value, which has already been fixed up. | |
5340 | FIXME: we use the parent's aspace here, although we're touching | |
5341 | the child, because the child hasn't been added to the inferior | |
5342 | list yet at this point. */ | |
5343 | ||
5344 | child_regcache | |
5b6d1e4f PA |
5345 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
5346 | ecs->ws.value.related_pid, | |
e2d96639 YQ |
5347 | gdbarch, |
5348 | parent_inf->aspace); | |
5349 | /* Read PC value of parent process. */ | |
5350 | parent_pc = regcache_read_pc (regcache); | |
5351 | ||
5352 | if (debug_displaced) | |
5353 | fprintf_unfiltered (gdb_stdlog, | |
5354 | "displaced: write child pc from %s to %s\n", | |
5355 | paddress (gdbarch, | |
5356 | regcache_read_pc (child_regcache)), | |
5357 | paddress (gdbarch, parent_pc)); | |
5358 | ||
5359 | regcache_write_pc (child_regcache, parent_pc); | |
5360 | } | |
5361 | } | |
5362 | ||
00431a78 | 5363 | context_switch (ecs); |
5a2901d9 | 5364 | |
b242c3c2 PA |
5365 | /* Immediately detach breakpoints from the child before there's |
5366 | any chance of letting the user delete breakpoints from the | |
5367 | breakpoint lists. If we don't do this early, it's easy to | |
5368 | leave left over traps in the child, vis: "break foo; catch | |
5369 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5370 | the fork on the last `continue', and by that time the | |
5371 | breakpoint at "foo" is long gone from the breakpoint table. | |
5372 | If we vforked, then we don't need to unpatch here, since both | |
5373 | parent and child are sharing the same memory pages; we'll | |
5374 | need to unpatch at follow/detach time instead to be certain | |
5375 | that new breakpoints added between catchpoint hit time and | |
5376 | vfork follow are detached. */ | |
5377 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5378 | { | |
b242c3c2 PA |
5379 | /* This won't actually modify the breakpoint list, but will |
5380 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5381 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5382 | } |
5383 | ||
34b7e8a6 | 5384 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5385 | |
e58b0e63 PA |
5386 | /* In case the event is caught by a catchpoint, remember that |
5387 | the event is to be followed at the next resume of the thread, | |
5388 | and not immediately. */ | |
5389 | ecs->event_thread->pending_follow = ecs->ws; | |
5390 | ||
f2ffa92b PA |
5391 | ecs->event_thread->suspend.stop_pc |
5392 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 5393 | |
16c381f0 | 5394 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5395 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5396 | ecs->event_thread->suspend.stop_pc, |
5397 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 5398 | |
c65d6b55 PA |
5399 | if (handle_stop_requested (ecs)) |
5400 | return; | |
5401 | ||
ce12b012 PA |
5402 | /* If no catchpoint triggered for this, then keep going. Note |
5403 | that we're interested in knowing the bpstat actually causes a | |
5404 | stop, not just if it may explain the signal. Software | |
5405 | watchpoints, for example, always appear in the bpstat. */ | |
5406 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5407 | { |
5ab2fbf1 | 5408 | bool follow_child |
3e43a32a | 5409 | = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 5410 | |
a493e3e2 | 5411 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 | 5412 | |
5b6d1e4f PA |
5413 | process_stratum_target *targ |
5414 | = ecs->event_thread->inf->process_target (); | |
5415 | ||
5ab2fbf1 | 5416 | bool should_resume = follow_fork (); |
e58b0e63 | 5417 | |
5b6d1e4f PA |
5418 | /* Note that one of these may be an invalid pointer, |
5419 | depending on detach_fork. */ | |
00431a78 | 5420 | thread_info *parent = ecs->event_thread; |
5b6d1e4f PA |
5421 | thread_info *child |
5422 | = find_thread_ptid (targ, ecs->ws.value.related_pid); | |
6c95b8df | 5423 | |
a2077e25 PA |
5424 | /* At this point, the parent is marked running, and the |
5425 | child is marked stopped. */ | |
5426 | ||
5427 | /* If not resuming the parent, mark it stopped. */ | |
5428 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5429 | parent->set_running (false); |
a2077e25 PA |
5430 | |
5431 | /* If resuming the child, mark it running. */ | |
5432 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5433 | child->set_running (true); |
a2077e25 | 5434 | |
6c95b8df | 5435 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5436 | if (!detach_fork && (non_stop |
5437 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5438 | { |
5439 | if (follow_child) | |
5440 | switch_to_thread (parent); | |
5441 | else | |
5442 | switch_to_thread (child); | |
5443 | ||
5444 | ecs->event_thread = inferior_thread (); | |
5445 | ecs->ptid = inferior_ptid; | |
5446 | keep_going (ecs); | |
5447 | } | |
5448 | ||
5449 | if (follow_child) | |
5450 | switch_to_thread (child); | |
5451 | else | |
5452 | switch_to_thread (parent); | |
5453 | ||
e58b0e63 PA |
5454 | ecs->event_thread = inferior_thread (); |
5455 | ecs->ptid = inferior_ptid; | |
5456 | ||
5457 | if (should_resume) | |
5458 | keep_going (ecs); | |
5459 | else | |
22bcd14b | 5460 | stop_waiting (ecs); |
04e68871 DJ |
5461 | return; |
5462 | } | |
94c57d6a PA |
5463 | process_event_stop_test (ecs); |
5464 | return; | |
488f131b | 5465 | |
6c95b8df PA |
5466 | case TARGET_WAITKIND_VFORK_DONE: |
5467 | /* Done with the shared memory region. Re-insert breakpoints in | |
5468 | the parent, and keep going. */ | |
5469 | ||
00431a78 | 5470 | context_switch (ecs); |
6c95b8df PA |
5471 | |
5472 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5473 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5474 | |
5475 | if (handle_stop_requested (ecs)) | |
5476 | return; | |
5477 | ||
6c95b8df PA |
5478 | /* This also takes care of reinserting breakpoints in the |
5479 | previously locked inferior. */ | |
5480 | keep_going (ecs); | |
5481 | return; | |
5482 | ||
488f131b | 5483 | case TARGET_WAITKIND_EXECD: |
488f131b | 5484 | |
cbd2b4e3 PA |
5485 | /* Note we can't read registers yet (the stop_pc), because we |
5486 | don't yet know the inferior's post-exec architecture. | |
5487 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5488 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5489 | |
6c95b8df PA |
5490 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5491 | handle_vfork_child_exec_or_exit (1); | |
5492 | ||
795e548f PA |
5493 | /* This causes the eventpoints and symbol table to be reset. |
5494 | Must do this now, before trying to determine whether to | |
5495 | stop. */ | |
71b43ef8 | 5496 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5497 | |
17d8546e DB |
5498 | /* In follow_exec we may have deleted the original thread and |
5499 | created a new one. Make sure that the event thread is the | |
5500 | execd thread for that case (this is a nop otherwise). */ | |
5501 | ecs->event_thread = inferior_thread (); | |
5502 | ||
f2ffa92b PA |
5503 | ecs->event_thread->suspend.stop_pc |
5504 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5505 | |
16c381f0 | 5506 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5507 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5508 | ecs->event_thread->suspend.stop_pc, |
5509 | ecs->event_thread, &ecs->ws); | |
795e548f | 5510 | |
71b43ef8 PA |
5511 | /* Note that this may be referenced from inside |
5512 | bpstat_stop_status above, through inferior_has_execd. */ | |
5513 | xfree (ecs->ws.value.execd_pathname); | |
5514 | ecs->ws.value.execd_pathname = NULL; | |
5515 | ||
c65d6b55 PA |
5516 | if (handle_stop_requested (ecs)) |
5517 | return; | |
5518 | ||
04e68871 | 5519 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5520 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5521 | { |
a493e3e2 | 5522 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5523 | keep_going (ecs); |
5524 | return; | |
5525 | } | |
94c57d6a PA |
5526 | process_event_stop_test (ecs); |
5527 | return; | |
488f131b | 5528 | |
b4dc5ffa MK |
5529 | /* Be careful not to try to gather much state about a thread |
5530 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5531 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5532 | /* Getting the current syscall number. */ |
94c57d6a PA |
5533 | if (handle_syscall_event (ecs) == 0) |
5534 | process_event_stop_test (ecs); | |
5535 | return; | |
c906108c | 5536 | |
488f131b JB |
5537 | /* Before examining the threads further, step this thread to |
5538 | get it entirely out of the syscall. (We get notice of the | |
5539 | event when the thread is just on the verge of exiting a | |
5540 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5541 | into user code.) */ |
488f131b | 5542 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5543 | if (handle_syscall_event (ecs) == 0) |
5544 | process_event_stop_test (ecs); | |
5545 | return; | |
c906108c | 5546 | |
488f131b | 5547 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5548 | handle_signal_stop (ecs); |
5549 | return; | |
c906108c | 5550 | |
b2175913 MS |
5551 | case TARGET_WAITKIND_NO_HISTORY: |
5552 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5553 | |
d1988021 | 5554 | /* Switch to the stopped thread. */ |
00431a78 | 5555 | context_switch (ecs); |
edbcda09 | 5556 | infrun_log_debug ("stopped"); |
d1988021 | 5557 | |
34b7e8a6 | 5558 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5559 | ecs->event_thread->suspend.stop_pc |
5560 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5561 | |
5562 | if (handle_stop_requested (ecs)) | |
5563 | return; | |
5564 | ||
76727919 | 5565 | gdb::observers::no_history.notify (); |
22bcd14b | 5566 | stop_waiting (ecs); |
b2175913 | 5567 | return; |
488f131b | 5568 | } |
4f5d7f63 PA |
5569 | } |
5570 | ||
372316f1 PA |
5571 | /* Restart threads back to what they were trying to do back when we |
5572 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5573 | ignored. */ | |
4d9d9d04 PA |
5574 | |
5575 | static void | |
372316f1 PA |
5576 | restart_threads (struct thread_info *event_thread) |
5577 | { | |
372316f1 PA |
5578 | /* In case the instruction just stepped spawned a new thread. */ |
5579 | update_thread_list (); | |
5580 | ||
08036331 | 5581 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5582 | { |
f3f8ece4 PA |
5583 | switch_to_thread_no_regs (tp); |
5584 | ||
372316f1 PA |
5585 | if (tp == event_thread) |
5586 | { | |
edbcda09 SM |
5587 | infrun_log_debug ("restart threads: [%s] is event thread", |
5588 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5589 | continue; |
5590 | } | |
5591 | ||
5592 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5593 | { | |
edbcda09 SM |
5594 | infrun_log_debug ("restart threads: [%s] not meant to be running", |
5595 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5596 | continue; |
5597 | } | |
5598 | ||
5599 | if (tp->resumed) | |
5600 | { | |
edbcda09 SM |
5601 | infrun_log_debug ("restart threads: [%s] resumed", |
5602 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5603 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
5604 | continue; | |
5605 | } | |
5606 | ||
5607 | if (thread_is_in_step_over_chain (tp)) | |
5608 | { | |
edbcda09 SM |
5609 | infrun_log_debug ("restart threads: [%s] needs step-over", |
5610 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5611 | gdb_assert (!tp->resumed); |
5612 | continue; | |
5613 | } | |
5614 | ||
5615 | ||
5616 | if (tp->suspend.waitstatus_pending_p) | |
5617 | { | |
edbcda09 SM |
5618 | infrun_log_debug ("restart threads: [%s] has pending status", |
5619 | target_pid_to_str (tp->ptid).c_str ()); | |
719546c4 | 5620 | tp->resumed = true; |
372316f1 PA |
5621 | continue; |
5622 | } | |
5623 | ||
c65d6b55 PA |
5624 | gdb_assert (!tp->stop_requested); |
5625 | ||
372316f1 PA |
5626 | /* If some thread needs to start a step-over at this point, it |
5627 | should still be in the step-over queue, and thus skipped | |
5628 | above. */ | |
5629 | if (thread_still_needs_step_over (tp)) | |
5630 | { | |
5631 | internal_error (__FILE__, __LINE__, | |
5632 | "thread [%s] needs a step-over, but not in " | |
5633 | "step-over queue\n", | |
a068643d | 5634 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5635 | } |
5636 | ||
5637 | if (currently_stepping (tp)) | |
5638 | { | |
edbcda09 SM |
5639 | infrun_log_debug ("restart threads: [%s] was stepping", |
5640 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5641 | keep_going_stepped_thread (tp); |
5642 | } | |
5643 | else | |
5644 | { | |
5645 | struct execution_control_state ecss; | |
5646 | struct execution_control_state *ecs = &ecss; | |
5647 | ||
edbcda09 SM |
5648 | infrun_log_debug ("restart threads: [%s] continuing", |
5649 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 5650 | reset_ecs (ecs, tp); |
00431a78 | 5651 | switch_to_thread (tp); |
372316f1 PA |
5652 | keep_going_pass_signal (ecs); |
5653 | } | |
5654 | } | |
5655 | } | |
5656 | ||
5657 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5658 | a pending waitstatus. */ | |
5659 | ||
5660 | static int | |
5661 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5662 | void *arg) | |
5663 | { | |
5664 | return (tp->resumed | |
5665 | && tp->suspend.waitstatus_pending_p); | |
5666 | } | |
5667 | ||
5668 | /* Called when we get an event that may finish an in-line or | |
5669 | out-of-line (displaced stepping) step-over started previously. | |
5670 | Return true if the event is processed and we should go back to the | |
5671 | event loop; false if the caller should continue processing the | |
5672 | event. */ | |
5673 | ||
5674 | static int | |
4d9d9d04 PA |
5675 | finish_step_over (struct execution_control_state *ecs) |
5676 | { | |
372316f1 PA |
5677 | int had_step_over_info; |
5678 | ||
9844051a SM |
5679 | displaced_step_finish (ecs->event_thread, |
5680 | ecs->event_thread->suspend.stop_signal); | |
4d9d9d04 | 5681 | |
372316f1 PA |
5682 | had_step_over_info = step_over_info_valid_p (); |
5683 | ||
5684 | if (had_step_over_info) | |
4d9d9d04 PA |
5685 | { |
5686 | /* If we're stepping over a breakpoint with all threads locked, | |
5687 | then only the thread that was stepped should be reporting | |
5688 | back an event. */ | |
5689 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5690 | ||
c65d6b55 | 5691 | clear_step_over_info (); |
4d9d9d04 PA |
5692 | } |
5693 | ||
fbea99ea | 5694 | if (!target_is_non_stop_p ()) |
372316f1 | 5695 | return 0; |
4d9d9d04 PA |
5696 | |
5697 | /* Start a new step-over in another thread if there's one that | |
5698 | needs it. */ | |
5699 | start_step_over (); | |
372316f1 PA |
5700 | |
5701 | /* If we were stepping over a breakpoint before, and haven't started | |
5702 | a new in-line step-over sequence, then restart all other threads | |
5703 | (except the event thread). We can't do this in all-stop, as then | |
5704 | e.g., we wouldn't be able to issue any other remote packet until | |
5705 | these other threads stop. */ | |
5706 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5707 | { | |
5708 | struct thread_info *pending; | |
5709 | ||
5710 | /* If we only have threads with pending statuses, the restart | |
5711 | below won't restart any thread and so nothing re-inserts the | |
5712 | breakpoint we just stepped over. But we need it inserted | |
5713 | when we later process the pending events, otherwise if | |
5714 | another thread has a pending event for this breakpoint too, | |
5715 | we'd discard its event (because the breakpoint that | |
5716 | originally caused the event was no longer inserted). */ | |
00431a78 | 5717 | context_switch (ecs); |
372316f1 PA |
5718 | insert_breakpoints (); |
5719 | ||
5720 | restart_threads (ecs->event_thread); | |
5721 | ||
5722 | /* If we have events pending, go through handle_inferior_event | |
5723 | again, picking up a pending event at random. This avoids | |
5724 | thread starvation. */ | |
5725 | ||
5726 | /* But not if we just stepped over a watchpoint in order to let | |
5727 | the instruction execute so we can evaluate its expression. | |
5728 | The set of watchpoints that triggered is recorded in the | |
5729 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5730 | If we processed another event first, that other event could | |
5731 | clobber this info. */ | |
5732 | if (ecs->event_thread->stepping_over_watchpoint) | |
5733 | return 0; | |
5734 | ||
5735 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5736 | NULL); | |
5737 | if (pending != NULL) | |
5738 | { | |
5739 | struct thread_info *tp = ecs->event_thread; | |
5740 | struct regcache *regcache; | |
5741 | ||
edbcda09 SM |
5742 | infrun_log_debug ("found resumed threads with " |
5743 | "pending events, saving status"); | |
372316f1 PA |
5744 | |
5745 | gdb_assert (pending != tp); | |
5746 | ||
5747 | /* Record the event thread's event for later. */ | |
5748 | save_waitstatus (tp, &ecs->ws); | |
5749 | /* This was cleared early, by handle_inferior_event. Set it | |
5750 | so this pending event is considered by | |
5751 | do_target_wait. */ | |
719546c4 | 5752 | tp->resumed = true; |
372316f1 PA |
5753 | |
5754 | gdb_assert (!tp->executing); | |
5755 | ||
00431a78 | 5756 | regcache = get_thread_regcache (tp); |
372316f1 PA |
5757 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
5758 | ||
edbcda09 SM |
5759 | infrun_log_debug ("saved stop_pc=%s for %s " |
5760 | "(currently_stepping=%d)\n", | |
5761 | paddress (target_gdbarch (), | |
5762 | tp->suspend.stop_pc), | |
5763 | target_pid_to_str (tp->ptid).c_str (), | |
5764 | currently_stepping (tp)); | |
372316f1 PA |
5765 | |
5766 | /* This in-line step-over finished; clear this so we won't | |
5767 | start a new one. This is what handle_signal_stop would | |
5768 | do, if we returned false. */ | |
5769 | tp->stepping_over_breakpoint = 0; | |
5770 | ||
5771 | /* Wake up the event loop again. */ | |
5772 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5773 | ||
5774 | prepare_to_wait (ecs); | |
5775 | return 1; | |
5776 | } | |
5777 | } | |
5778 | ||
5779 | return 0; | |
4d9d9d04 PA |
5780 | } |
5781 | ||
4f5d7f63 PA |
5782 | /* Come here when the program has stopped with a signal. */ |
5783 | ||
5784 | static void | |
5785 | handle_signal_stop (struct execution_control_state *ecs) | |
5786 | { | |
5787 | struct frame_info *frame; | |
5788 | struct gdbarch *gdbarch; | |
5789 | int stopped_by_watchpoint; | |
5790 | enum stop_kind stop_soon; | |
5791 | int random_signal; | |
c906108c | 5792 | |
f0407826 DE |
5793 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5794 | ||
c65d6b55 PA |
5795 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5796 | ||
f0407826 DE |
5797 | /* Do we need to clean up the state of a thread that has |
5798 | completed a displaced single-step? (Doing so usually affects | |
5799 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5800 | if (finish_step_over (ecs)) |
5801 | return; | |
f0407826 DE |
5802 | |
5803 | /* If we either finished a single-step or hit a breakpoint, but | |
5804 | the user wanted this thread to be stopped, pretend we got a | |
5805 | SIG0 (generic unsignaled stop). */ | |
5806 | if (ecs->event_thread->stop_requested | |
5807 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5808 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5809 | |
f2ffa92b PA |
5810 | ecs->event_thread->suspend.stop_pc |
5811 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 5812 | |
527159b7 | 5813 | if (debug_infrun) |
237fc4c9 | 5814 | { |
00431a78 | 5815 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 5816 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 5817 | |
f3f8ece4 | 5818 | switch_to_thread (ecs->event_thread); |
5af949e3 | 5819 | |
edbcda09 SM |
5820 | infrun_log_debug ("stop_pc=%s", |
5821 | paddress (reg_gdbarch, | |
5822 | ecs->event_thread->suspend.stop_pc)); | |
d92524f1 | 5823 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5824 | { |
5825 | CORE_ADDR addr; | |
abbb1732 | 5826 | |
edbcda09 | 5827 | infrun_log_debug ("stopped by watchpoint"); |
237fc4c9 | 5828 | |
8b88a78e | 5829 | if (target_stopped_data_address (current_top_target (), &addr)) |
edbcda09 SM |
5830 | infrun_log_debug ("stopped data address=%s", |
5831 | paddress (reg_gdbarch, addr)); | |
237fc4c9 | 5832 | else |
edbcda09 | 5833 | infrun_log_debug ("(no data address available)"); |
237fc4c9 PA |
5834 | } |
5835 | } | |
527159b7 | 5836 | |
36fa8042 PA |
5837 | /* This is originated from start_remote(), start_inferior() and |
5838 | shared libraries hook functions. */ | |
00431a78 | 5839 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
5840 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
5841 | { | |
00431a78 | 5842 | context_switch (ecs); |
edbcda09 | 5843 | infrun_log_debug ("quietly stopped"); |
36fa8042 | 5844 | stop_print_frame = 1; |
22bcd14b | 5845 | stop_waiting (ecs); |
36fa8042 PA |
5846 | return; |
5847 | } | |
5848 | ||
36fa8042 PA |
5849 | /* This originates from attach_command(). We need to overwrite |
5850 | the stop_signal here, because some kernels don't ignore a | |
5851 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5852 | See more comments in inferior.h. On the other hand, if we | |
5853 | get a non-SIGSTOP, report it to the user - assume the backend | |
5854 | will handle the SIGSTOP if it should show up later. | |
5855 | ||
5856 | Also consider that the attach is complete when we see a | |
5857 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5858 | target extended-remote report it instead of a SIGSTOP | |
5859 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5860 | signal, so this is no exception. | |
5861 | ||
5862 | Also consider that the attach is complete when we see a | |
5863 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5864 | the target to stop all threads of the inferior, in case the | |
5865 | low level attach operation doesn't stop them implicitly. If | |
5866 | they weren't stopped implicitly, then the stub will report a | |
5867 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5868 | other than GDB's request. */ | |
5869 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5870 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5871 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5872 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5873 | { | |
5874 | stop_print_frame = 1; | |
22bcd14b | 5875 | stop_waiting (ecs); |
36fa8042 PA |
5876 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5877 | return; | |
5878 | } | |
5879 | ||
488f131b | 5880 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 | 5881 | so, then switch to that thread. */ |
d7e15655 | 5882 | if (ecs->ptid != inferior_ptid) |
488f131b | 5883 | { |
edbcda09 | 5884 | infrun_log_debug ("context switch"); |
527159b7 | 5885 | |
00431a78 | 5886 | context_switch (ecs); |
c5aa993b | 5887 | |
9a4105ab | 5888 | if (deprecated_context_hook) |
00431a78 | 5889 | deprecated_context_hook (ecs->event_thread->global_num); |
488f131b | 5890 | } |
c906108c | 5891 | |
568d6575 UW |
5892 | /* At this point, get hold of the now-current thread's frame. */ |
5893 | frame = get_current_frame (); | |
5894 | gdbarch = get_frame_arch (frame); | |
5895 | ||
2adfaa28 | 5896 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5897 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5898 | { |
af48d08f | 5899 | struct regcache *regcache; |
af48d08f | 5900 | CORE_ADDR pc; |
2adfaa28 | 5901 | |
00431a78 | 5902 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
5903 | const address_space *aspace = regcache->aspace (); |
5904 | ||
af48d08f | 5905 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 5906 | |
af48d08f PA |
5907 | /* However, before doing so, if this single-step breakpoint was |
5908 | actually for another thread, set this thread up for moving | |
5909 | past it. */ | |
5910 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5911 | aspace, pc)) | |
5912 | { | |
5913 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 | 5914 | { |
edbcda09 SM |
5915 | infrun_log_debug ("[%s] hit another thread's single-step " |
5916 | "breakpoint", | |
5917 | target_pid_to_str (ecs->ptid).c_str ()); | |
af48d08f PA |
5918 | ecs->hit_singlestep_breakpoint = 1; |
5919 | } | |
5920 | } | |
5921 | else | |
5922 | { | |
edbcda09 SM |
5923 | infrun_log_debug ("[%s] hit its single-step breakpoint", |
5924 | target_pid_to_str (ecs->ptid).c_str ()); | |
2adfaa28 | 5925 | } |
488f131b | 5926 | } |
af48d08f | 5927 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5928 | |
963f9c80 PA |
5929 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5930 | && ecs->event_thread->control.trap_expected | |
5931 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5932 | stopped_by_watchpoint = 0; |
5933 | else | |
5934 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5935 | ||
5936 | /* If necessary, step over this watchpoint. We'll be back to display | |
5937 | it in a moment. */ | |
5938 | if (stopped_by_watchpoint | |
d92524f1 | 5939 | && (target_have_steppable_watchpoint |
568d6575 | 5940 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5941 | { |
488f131b JB |
5942 | /* At this point, we are stopped at an instruction which has |
5943 | attempted to write to a piece of memory under control of | |
5944 | a watchpoint. The instruction hasn't actually executed | |
5945 | yet. If we were to evaluate the watchpoint expression | |
5946 | now, we would get the old value, and therefore no change | |
5947 | would seem to have occurred. | |
5948 | ||
5949 | In order to make watchpoints work `right', we really need | |
5950 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5951 | watchpoint expression. We do this by single-stepping the |
5952 | target. | |
5953 | ||
7f89fd65 | 5954 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5955 | it. For example, the PA can (with some kernel cooperation) |
5956 | single step over a watchpoint without disabling the watchpoint. | |
5957 | ||
5958 | It is far more common to need to disable a watchpoint to step | |
5959 | the inferior over it. If we have non-steppable watchpoints, | |
5960 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5961 | disable all watchpoints. |
5962 | ||
5963 | Any breakpoint at PC must also be stepped over -- if there's | |
5964 | one, it will have already triggered before the watchpoint | |
5965 | triggered, and we either already reported it to the user, or | |
5966 | it didn't cause a stop and we called keep_going. In either | |
5967 | case, if there was a breakpoint at PC, we must be trying to | |
5968 | step past it. */ | |
5969 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5970 | keep_going (ecs); | |
488f131b JB |
5971 | return; |
5972 | } | |
5973 | ||
4e1c45ea | 5974 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5975 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5976 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5977 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5978 | stop_print_frame = 1; |
488f131b | 5979 | stopped_by_random_signal = 0; |
ddfe970e | 5980 | bpstat stop_chain = NULL; |
488f131b | 5981 | |
edb3359d DJ |
5982 | /* Hide inlined functions starting here, unless we just performed stepi or |
5983 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5984 | inline function call sites). */ | |
16c381f0 | 5985 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 5986 | { |
00431a78 PA |
5987 | const address_space *aspace |
5988 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
5989 | |
5990 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5991 | determine that the address is one where functions cannot have | |
5992 | been inlined. This improves performance with inferiors that | |
5993 | load a lot of shared libraries, because the solib event | |
5994 | breakpoint is defined as the address of a function (i.e. not | |
5995 | inline). Note that we have to check the previous PC as well | |
5996 | as the current one to catch cases when we have just | |
5997 | single-stepped off a breakpoint prior to reinstating it. | |
5998 | Note that we're assuming that the code we single-step to is | |
5999 | not inline, but that's not definitive: there's nothing | |
6000 | preventing the event breakpoint function from containing | |
6001 | inlined code, and the single-step ending up there. If the | |
6002 | user had set a breakpoint on that inlined code, the missing | |
6003 | skip_inline_frames call would break things. Fortunately | |
6004 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
6005 | if (!pc_at_non_inline_function (aspace, |
6006 | ecs->event_thread->suspend.stop_pc, | |
6007 | &ecs->ws) | |
a210c238 MR |
6008 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
6009 | && ecs->event_thread->control.trap_expected | |
6010 | && pc_at_non_inline_function (aspace, | |
6011 | ecs->event_thread->prev_pc, | |
09ac7c10 | 6012 | &ecs->ws))) |
1c5a993e | 6013 | { |
f2ffa92b PA |
6014 | stop_chain = build_bpstat_chain (aspace, |
6015 | ecs->event_thread->suspend.stop_pc, | |
6016 | &ecs->ws); | |
00431a78 | 6017 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
6018 | |
6019 | /* Re-fetch current thread's frame in case that invalidated | |
6020 | the frame cache. */ | |
6021 | frame = get_current_frame (); | |
6022 | gdbarch = get_frame_arch (frame); | |
6023 | } | |
0574c78f | 6024 | } |
edb3359d | 6025 | |
a493e3e2 | 6026 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 6027 | && ecs->event_thread->control.trap_expected |
568d6575 | 6028 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6029 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6030 | { |
b50d7442 | 6031 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6032 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6033 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6034 | with a delay slot. It needs to be stepped twice, once for |
6035 | the instruction and once for the delay slot. */ | |
6036 | int step_through_delay | |
568d6575 | 6037 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6038 | |
edbcda09 SM |
6039 | if (step_through_delay) |
6040 | infrun_log_debug ("step through delay"); | |
6041 | ||
16c381f0 JK |
6042 | if (ecs->event_thread->control.step_range_end == 0 |
6043 | && step_through_delay) | |
3352ef37 AC |
6044 | { |
6045 | /* The user issued a continue when stopped at a breakpoint. | |
6046 | Set up for another trap and get out of here. */ | |
4e1c45ea | 6047 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6048 | keep_going (ecs); |
6049 | return; | |
6050 | } | |
6051 | else if (step_through_delay) | |
6052 | { | |
6053 | /* The user issued a step when stopped at a breakpoint. | |
6054 | Maybe we should stop, maybe we should not - the delay | |
6055 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6056 | case, don't decide that here, just set |
6057 | ecs->stepping_over_breakpoint, making sure we | |
6058 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6059 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6060 | } |
6061 | } | |
6062 | ||
ab04a2af TT |
6063 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6064 | handles this event. */ | |
6065 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6066 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
6067 | ecs->event_thread->suspend.stop_pc, |
6068 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 6069 | |
ab04a2af TT |
6070 | /* Following in case break condition called a |
6071 | function. */ | |
6072 | stop_print_frame = 1; | |
73dd234f | 6073 | |
ab04a2af TT |
6074 | /* This is where we handle "moribund" watchpoints. Unlike |
6075 | software breakpoints traps, hardware watchpoint traps are | |
6076 | always distinguishable from random traps. If no high-level | |
6077 | watchpoint is associated with the reported stop data address | |
6078 | anymore, then the bpstat does not explain the signal --- | |
6079 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6080 | set. */ | |
6081 | ||
edbcda09 | 6082 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
47591c29 | 6083 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6084 | GDB_SIGNAL_TRAP) |
ab04a2af | 6085 | && stopped_by_watchpoint) |
edbcda09 SM |
6086 | { |
6087 | infrun_log_debug ("no user watchpoint explains watchpoint SIGTRAP, " | |
6088 | "ignoring"); | |
6089 | } | |
73dd234f | 6090 | |
bac7d97b | 6091 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6092 | at one stage in the past included checks for an inferior |
6093 | function call's call dummy's return breakpoint. The original | |
6094 | comment, that went with the test, read: | |
03cebad2 | 6095 | |
ab04a2af TT |
6096 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6097 | another signal besides SIGTRAP, so check here as well as | |
6098 | above.'' | |
73dd234f | 6099 | |
ab04a2af TT |
6100 | If someone ever tries to get call dummys on a |
6101 | non-executable stack to work (where the target would stop | |
6102 | with something like a SIGSEGV), then those tests might need | |
6103 | to be re-instated. Given, however, that the tests were only | |
6104 | enabled when momentary breakpoints were not being used, I | |
6105 | suspect that it won't be the case. | |
488f131b | 6106 | |
ab04a2af TT |
6107 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6108 | be necessary for call dummies on a non-executable stack on | |
6109 | SPARC. */ | |
488f131b | 6110 | |
bac7d97b | 6111 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6112 | random_signal |
6113 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
6114 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 6115 | |
1cf4d951 PA |
6116 | /* Maybe this was a trap for a software breakpoint that has since |
6117 | been removed. */ | |
6118 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6119 | { | |
5133a315 LM |
6120 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
6121 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
6122 | { |
6123 | struct regcache *regcache; | |
6124 | int decr_pc; | |
6125 | ||
6126 | /* Re-adjust PC to what the program would see if GDB was not | |
6127 | debugging it. */ | |
00431a78 | 6128 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6129 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6130 | if (decr_pc != 0) |
6131 | { | |
07036511 TT |
6132 | gdb::optional<scoped_restore_tmpl<int>> |
6133 | restore_operation_disable; | |
1cf4d951 PA |
6134 | |
6135 | if (record_full_is_used ()) | |
07036511 TT |
6136 | restore_operation_disable.emplace |
6137 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6138 | |
f2ffa92b PA |
6139 | regcache_write_pc (regcache, |
6140 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
6141 | } |
6142 | } | |
6143 | else | |
6144 | { | |
6145 | /* A delayed software breakpoint event. Ignore the trap. */ | |
edbcda09 | 6146 | infrun_log_debug ("delayed software breakpoint trap, ignoring"); |
1cf4d951 PA |
6147 | random_signal = 0; |
6148 | } | |
6149 | } | |
6150 | ||
6151 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6152 | has since been removed. */ | |
6153 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6154 | { | |
6155 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
edbcda09 SM |
6156 | infrun_log_debug ("delayed hardware breakpoint/watchpoint " |
6157 | "trap, ignoring"); | |
1cf4d951 PA |
6158 | random_signal = 0; |
6159 | } | |
6160 | ||
bac7d97b PA |
6161 | /* If not, perhaps stepping/nexting can. */ |
6162 | if (random_signal) | |
6163 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6164 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6165 | |
2adfaa28 PA |
6166 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6167 | thread. Single-step breakpoints are transparent to the | |
6168 | breakpoints module. */ | |
6169 | if (random_signal) | |
6170 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6171 | ||
bac7d97b PA |
6172 | /* No? Perhaps we got a moribund watchpoint. */ |
6173 | if (random_signal) | |
6174 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6175 | |
c65d6b55 PA |
6176 | /* Always stop if the user explicitly requested this thread to |
6177 | remain stopped. */ | |
6178 | if (ecs->event_thread->stop_requested) | |
6179 | { | |
6180 | random_signal = 1; | |
edbcda09 | 6181 | infrun_log_debug ("user-requested stop"); |
c65d6b55 PA |
6182 | } |
6183 | ||
488f131b JB |
6184 | /* For the program's own signals, act according to |
6185 | the signal handling tables. */ | |
6186 | ||
ce12b012 | 6187 | if (random_signal) |
488f131b JB |
6188 | { |
6189 | /* Signal not for debugging purposes. */ | |
5b6d1e4f | 6190 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
c9737c08 | 6191 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6192 | |
edbcda09 SM |
6193 | infrun_log_debug ("random signal (%s)", |
6194 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6195 | |
488f131b JB |
6196 | stopped_by_random_signal = 1; |
6197 | ||
252fbfc8 PA |
6198 | /* Always stop on signals if we're either just gaining control |
6199 | of the program, or the user explicitly requested this thread | |
6200 | to remain stopped. */ | |
d6b48e9c | 6201 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6202 | || ecs->event_thread->stop_requested |
24291992 | 6203 | || (!inf->detaching |
16c381f0 | 6204 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 6205 | { |
22bcd14b | 6206 | stop_waiting (ecs); |
488f131b JB |
6207 | return; |
6208 | } | |
b57bacec PA |
6209 | |
6210 | /* Notify observers the signal has "handle print" set. Note we | |
6211 | returned early above if stopping; normal_stop handles the | |
6212 | printing in that case. */ | |
6213 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6214 | { | |
6215 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6216 | target_terminal::ours_for_output (); |
76727919 | 6217 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 6218 | target_terminal::inferior (); |
b57bacec | 6219 | } |
488f131b JB |
6220 | |
6221 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6222 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6223 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6224 | |
f2ffa92b | 6225 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 6226 | && ecs->event_thread->control.trap_expected |
8358c15c | 6227 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6228 | { |
6229 | /* We were just starting a new sequence, attempting to | |
6230 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6231 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6232 | of the stepping range so GDB needs to remember to, when |
6233 | the signal handler returns, resume stepping off that | |
6234 | breakpoint. */ | |
6235 | /* To simplify things, "continue" is forced to use the same | |
6236 | code paths as single-step - set a breakpoint at the | |
6237 | signal return address and then, once hit, step off that | |
6238 | breakpoint. */ | |
edbcda09 | 6239 | infrun_log_debug ("signal arrived while stepping over breakpoint"); |
d3169d93 | 6240 | |
2c03e5be | 6241 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6242 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6243 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6244 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6245 | |
6246 | /* If we were nexting/stepping some other thread, switch to | |
6247 | it, so that we don't continue it, losing control. */ | |
6248 | if (!switch_back_to_stepped_thread (ecs)) | |
6249 | keep_going (ecs); | |
9d799f85 | 6250 | return; |
68f53502 | 6251 | } |
9d799f85 | 6252 | |
e5f8a7cc | 6253 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
6254 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6255 | ecs->event_thread) | |
e5f8a7cc | 6256 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 6257 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6258 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6259 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6260 | { |
6261 | /* The inferior is about to take a signal that will take it | |
6262 | out of the single step range. Set a breakpoint at the | |
6263 | current PC (which is presumably where the signal handler | |
6264 | will eventually return) and then allow the inferior to | |
6265 | run free. | |
6266 | ||
6267 | Note that this is only needed for a signal delivered | |
6268 | while in the single-step range. Nested signals aren't a | |
6269 | problem as they eventually all return. */ | |
edbcda09 | 6270 | infrun_log_debug ("signal may take us out of single-step range"); |
237fc4c9 | 6271 | |
372316f1 | 6272 | clear_step_over_info (); |
2c03e5be | 6273 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6274 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6275 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6276 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6277 | keep_going (ecs); |
6278 | return; | |
d303a6c7 | 6279 | } |
9d799f85 | 6280 | |
85102364 | 6281 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6282 | when either there's a nested signal, or when there's a |
6283 | pending signal enabled just as the signal handler returns | |
6284 | (leaving the inferior at the step-resume-breakpoint without | |
6285 | actually executing it). Either way continue until the | |
6286 | breakpoint is really hit. */ | |
c447ac0b PA |
6287 | |
6288 | if (!switch_back_to_stepped_thread (ecs)) | |
6289 | { | |
edbcda09 | 6290 | infrun_log_debug ("random signal, keep going"); |
c447ac0b PA |
6291 | |
6292 | keep_going (ecs); | |
6293 | } | |
6294 | return; | |
488f131b | 6295 | } |
94c57d6a PA |
6296 | |
6297 | process_event_stop_test (ecs); | |
6298 | } | |
6299 | ||
6300 | /* Come here when we've got some debug event / signal we can explain | |
6301 | (IOW, not a random signal), and test whether it should cause a | |
6302 | stop, or whether we should resume the inferior (transparently). | |
6303 | E.g., could be a breakpoint whose condition evaluates false; we | |
6304 | could be still stepping within the line; etc. */ | |
6305 | ||
6306 | static void | |
6307 | process_event_stop_test (struct execution_control_state *ecs) | |
6308 | { | |
6309 | struct symtab_and_line stop_pc_sal; | |
6310 | struct frame_info *frame; | |
6311 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6312 | CORE_ADDR jmp_buf_pc; |
6313 | struct bpstat_what what; | |
94c57d6a | 6314 | |
cdaa5b73 | 6315 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6316 | |
cdaa5b73 PA |
6317 | frame = get_current_frame (); |
6318 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6319 | |
cdaa5b73 | 6320 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6321 | |
cdaa5b73 PA |
6322 | if (what.call_dummy) |
6323 | { | |
6324 | stop_stack_dummy = what.call_dummy; | |
6325 | } | |
186c406b | 6326 | |
243a9253 PA |
6327 | /* A few breakpoint types have callbacks associated (e.g., |
6328 | bp_jit_event). Run them now. */ | |
6329 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6330 | ||
cdaa5b73 PA |
6331 | /* If we hit an internal event that triggers symbol changes, the |
6332 | current frame will be invalidated within bpstat_what (e.g., if we | |
6333 | hit an internal solib event). Re-fetch it. */ | |
6334 | frame = get_current_frame (); | |
6335 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6336 | |
cdaa5b73 PA |
6337 | switch (what.main_action) |
6338 | { | |
6339 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6340 | /* If we hit the breakpoint at longjmp while stepping, we | |
6341 | install a momentary breakpoint at the target of the | |
6342 | jmp_buf. */ | |
186c406b | 6343 | |
edbcda09 | 6344 | infrun_log_debug ("BPSTAT_WHAT_SET_LONGJMP_RESUME"); |
186c406b | 6345 | |
cdaa5b73 | 6346 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6347 | |
cdaa5b73 PA |
6348 | if (what.is_longjmp) |
6349 | { | |
6350 | struct value *arg_value; | |
6351 | ||
6352 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6353 | then use it to extract the arguments. The destination PC | |
6354 | is the third argument to the probe. */ | |
6355 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6356 | if (arg_value) | |
8fa0c4f8 AA |
6357 | { |
6358 | jmp_buf_pc = value_as_address (arg_value); | |
6359 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6360 | } | |
cdaa5b73 PA |
6361 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6362 | || !gdbarch_get_longjmp_target (gdbarch, | |
6363 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6364 | { |
edbcda09 SM |
6365 | infrun_log_debug ("BPSTAT_WHAT_SET_LONGJMP_RESUME " |
6366 | "(!gdbarch_get_longjmp_target)"); | |
cdaa5b73 PA |
6367 | keep_going (ecs); |
6368 | return; | |
e2e4d78b | 6369 | } |
e2e4d78b | 6370 | |
cdaa5b73 PA |
6371 | /* Insert a breakpoint at resume address. */ |
6372 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6373 | } | |
6374 | else | |
6375 | check_exception_resume (ecs, frame); | |
6376 | keep_going (ecs); | |
6377 | return; | |
e81a37f7 | 6378 | |
cdaa5b73 PA |
6379 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6380 | { | |
6381 | struct frame_info *init_frame; | |
e81a37f7 | 6382 | |
cdaa5b73 | 6383 | /* There are several cases to consider. |
c906108c | 6384 | |
cdaa5b73 PA |
6385 | 1. The initiating frame no longer exists. In this case we |
6386 | must stop, because the exception or longjmp has gone too | |
6387 | far. | |
2c03e5be | 6388 | |
cdaa5b73 PA |
6389 | 2. The initiating frame exists, and is the same as the |
6390 | current frame. We stop, because the exception or longjmp | |
6391 | has been caught. | |
2c03e5be | 6392 | |
cdaa5b73 PA |
6393 | 3. The initiating frame exists and is different from the |
6394 | current frame. This means the exception or longjmp has | |
6395 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6396 | |
cdaa5b73 PA |
6397 | 4. longjmp breakpoint has been placed just to protect |
6398 | against stale dummy frames and user is not interested in | |
6399 | stopping around longjmps. */ | |
c5aa993b | 6400 | |
edbcda09 | 6401 | infrun_log_debug ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME"); |
c5aa993b | 6402 | |
cdaa5b73 PA |
6403 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6404 | != NULL); | |
6405 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6406 | |
cdaa5b73 PA |
6407 | if (what.is_longjmp) |
6408 | { | |
b67a2c6f | 6409 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6410 | |
cdaa5b73 | 6411 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6412 | { |
cdaa5b73 PA |
6413 | /* Case 4. */ |
6414 | keep_going (ecs); | |
6415 | return; | |
e5ef252a | 6416 | } |
cdaa5b73 | 6417 | } |
c5aa993b | 6418 | |
cdaa5b73 | 6419 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6420 | |
cdaa5b73 PA |
6421 | if (init_frame) |
6422 | { | |
6423 | struct frame_id current_id | |
6424 | = get_frame_id (get_current_frame ()); | |
6425 | if (frame_id_eq (current_id, | |
6426 | ecs->event_thread->initiating_frame)) | |
6427 | { | |
6428 | /* Case 2. Fall through. */ | |
6429 | } | |
6430 | else | |
6431 | { | |
6432 | /* Case 3. */ | |
6433 | keep_going (ecs); | |
6434 | return; | |
6435 | } | |
68f53502 | 6436 | } |
488f131b | 6437 | |
cdaa5b73 PA |
6438 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6439 | exists. */ | |
6440 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6441 | |
bdc36728 | 6442 | end_stepping_range (ecs); |
cdaa5b73 PA |
6443 | } |
6444 | return; | |
e5ef252a | 6445 | |
cdaa5b73 | 6446 | case BPSTAT_WHAT_SINGLE: |
edbcda09 | 6447 | infrun_log_debug ("BPSTAT_WHAT_SINGLE"); |
cdaa5b73 PA |
6448 | ecs->event_thread->stepping_over_breakpoint = 1; |
6449 | /* Still need to check other stuff, at least the case where we | |
6450 | are stepping and step out of the right range. */ | |
6451 | break; | |
e5ef252a | 6452 | |
cdaa5b73 | 6453 | case BPSTAT_WHAT_STEP_RESUME: |
edbcda09 | 6454 | infrun_log_debug ("BPSTAT_WHAT_STEP_RESUME"); |
e5ef252a | 6455 | |
cdaa5b73 PA |
6456 | delete_step_resume_breakpoint (ecs->event_thread); |
6457 | if (ecs->event_thread->control.proceed_to_finish | |
6458 | && execution_direction == EXEC_REVERSE) | |
6459 | { | |
6460 | struct thread_info *tp = ecs->event_thread; | |
6461 | ||
6462 | /* We are finishing a function in reverse, and just hit the | |
6463 | step-resume breakpoint at the start address of the | |
6464 | function, and we're almost there -- just need to back up | |
6465 | by one more single-step, which should take us back to the | |
6466 | function call. */ | |
6467 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6468 | keep_going (ecs); | |
e5ef252a | 6469 | return; |
cdaa5b73 PA |
6470 | } |
6471 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6472 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6473 | && execution_direction == EXEC_REVERSE) |
6474 | { | |
6475 | /* We are stepping over a function call in reverse, and just | |
6476 | hit the step-resume breakpoint at the start address of | |
6477 | the function. Go back to single-stepping, which should | |
6478 | take us back to the function call. */ | |
6479 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6480 | keep_going (ecs); | |
6481 | return; | |
6482 | } | |
6483 | break; | |
e5ef252a | 6484 | |
cdaa5b73 | 6485 | case BPSTAT_WHAT_STOP_NOISY: |
edbcda09 | 6486 | infrun_log_debug ("BPSTAT_WHAT_STOP_NOISY"); |
cdaa5b73 | 6487 | stop_print_frame = 1; |
e5ef252a | 6488 | |
99619bea PA |
6489 | /* Assume the thread stopped for a breapoint. We'll still check |
6490 | whether a/the breakpoint is there when the thread is next | |
6491 | resumed. */ | |
6492 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6493 | |
22bcd14b | 6494 | stop_waiting (ecs); |
cdaa5b73 | 6495 | return; |
e5ef252a | 6496 | |
cdaa5b73 | 6497 | case BPSTAT_WHAT_STOP_SILENT: |
edbcda09 | 6498 | infrun_log_debug ("BPSTAT_WHAT_STOP_SILENT"); |
cdaa5b73 | 6499 | stop_print_frame = 0; |
e5ef252a | 6500 | |
99619bea PA |
6501 | /* Assume the thread stopped for a breapoint. We'll still check |
6502 | whether a/the breakpoint is there when the thread is next | |
6503 | resumed. */ | |
6504 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6505 | stop_waiting (ecs); |
cdaa5b73 PA |
6506 | return; |
6507 | ||
6508 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
edbcda09 | 6509 | infrun_log_debug ("BPSTAT_WHAT_HP_STEP_RESUME"); |
cdaa5b73 PA |
6510 | |
6511 | delete_step_resume_breakpoint (ecs->event_thread); | |
6512 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6513 | { | |
6514 | /* Back when the step-resume breakpoint was inserted, we | |
6515 | were trying to single-step off a breakpoint. Go back to | |
6516 | doing that. */ | |
6517 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6518 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6519 | keep_going (ecs); | |
6520 | return; | |
e5ef252a | 6521 | } |
cdaa5b73 PA |
6522 | break; |
6523 | ||
6524 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6525 | break; | |
e5ef252a | 6526 | } |
c906108c | 6527 | |
af48d08f PA |
6528 | /* If we stepped a permanent breakpoint and we had a high priority |
6529 | step-resume breakpoint for the address we stepped, but we didn't | |
6530 | hit it, then we must have stepped into the signal handler. The | |
6531 | step-resume was only necessary to catch the case of _not_ | |
6532 | stepping into the handler, so delete it, and fall through to | |
6533 | checking whether the step finished. */ | |
6534 | if (ecs->event_thread->stepped_breakpoint) | |
6535 | { | |
6536 | struct breakpoint *sr_bp | |
6537 | = ecs->event_thread->control.step_resume_breakpoint; | |
6538 | ||
8d707a12 PA |
6539 | if (sr_bp != NULL |
6540 | && sr_bp->loc->permanent | |
af48d08f PA |
6541 | && sr_bp->type == bp_hp_step_resume |
6542 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6543 | { | |
edbcda09 | 6544 | infrun_log_debug ("stepped permanent breakpoint, stopped in handler"); |
af48d08f PA |
6545 | delete_step_resume_breakpoint (ecs->event_thread); |
6546 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6547 | } | |
6548 | } | |
6549 | ||
cdaa5b73 PA |
6550 | /* We come here if we hit a breakpoint but should not stop for it. |
6551 | Possibly we also were stepping and should stop for that. So fall | |
6552 | through and test for stepping. But, if not stepping, do not | |
6553 | stop. */ | |
c906108c | 6554 | |
a7212384 UW |
6555 | /* In all-stop mode, if we're currently stepping but have stopped in |
6556 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6557 | if (switch_back_to_stepped_thread (ecs)) |
6558 | return; | |
776f04fa | 6559 | |
8358c15c | 6560 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6561 | { |
edbcda09 | 6562 | infrun_log_debug ("step-resume breakpoint is inserted"); |
527159b7 | 6563 | |
488f131b JB |
6564 | /* Having a step-resume breakpoint overrides anything |
6565 | else having to do with stepping commands until | |
6566 | that breakpoint is reached. */ | |
488f131b JB |
6567 | keep_going (ecs); |
6568 | return; | |
6569 | } | |
c5aa993b | 6570 | |
16c381f0 | 6571 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6572 | { |
edbcda09 | 6573 | infrun_log_debug ("no stepping, continue"); |
488f131b | 6574 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6575 | keep_going (ecs); |
6576 | return; | |
6577 | } | |
c5aa993b | 6578 | |
4b7703ad JB |
6579 | /* Re-fetch current thread's frame in case the code above caused |
6580 | the frame cache to be re-initialized, making our FRAME variable | |
6581 | a dangling pointer. */ | |
6582 | frame = get_current_frame (); | |
628fe4e4 | 6583 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6584 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6585 | |
488f131b | 6586 | /* If stepping through a line, keep going if still within it. |
c906108c | 6587 | |
488f131b JB |
6588 | Note that step_range_end is the address of the first instruction |
6589 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6590 | within it! |
6591 | ||
6592 | Note also that during reverse execution, we may be stepping | |
6593 | through a function epilogue and therefore must detect when | |
6594 | the current-frame changes in the middle of a line. */ | |
6595 | ||
f2ffa92b PA |
6596 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6597 | ecs->event_thread) | |
31410e84 | 6598 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6599 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6600 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6601 | { |
edbcda09 SM |
6602 | infrun_log_debug |
6603 | ("stepping inside range [%s-%s]", | |
6604 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
6605 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6606 | |
c1e36e3e PA |
6607 | /* Tentatively re-enable range stepping; `resume' disables it if |
6608 | necessary (e.g., if we're stepping over a breakpoint or we | |
6609 | have software watchpoints). */ | |
6610 | ecs->event_thread->control.may_range_step = 1; | |
6611 | ||
b2175913 MS |
6612 | /* When stepping backward, stop at beginning of line range |
6613 | (unless it's the function entry point, in which case | |
6614 | keep going back to the call point). */ | |
f2ffa92b | 6615 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6616 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6617 | && stop_pc != ecs->stop_func_start |
6618 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6619 | end_stepping_range (ecs); |
b2175913 MS |
6620 | else |
6621 | keep_going (ecs); | |
6622 | ||
488f131b JB |
6623 | return; |
6624 | } | |
c5aa993b | 6625 | |
488f131b | 6626 | /* We stepped out of the stepping range. */ |
c906108c | 6627 | |
488f131b | 6628 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6629 | loader dynamic symbol resolution code... |
6630 | ||
6631 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6632 | time loader code and reach the callee's address. | |
6633 | ||
6634 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6635 | the runtime loader code is handled just like any other | |
6636 | undebuggable function call. Now we need only keep stepping | |
6637 | backward through the trampoline code, and that's handled further | |
6638 | down, so there is nothing for us to do here. */ | |
6639 | ||
6640 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6641 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6642 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6643 | { |
4c8c40e6 | 6644 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6645 | gdbarch_skip_solib_resolver (gdbarch, |
6646 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6647 | |
edbcda09 | 6648 | infrun_log_debug ("stepped into dynsym resolve code"); |
527159b7 | 6649 | |
488f131b JB |
6650 | if (pc_after_resolver) |
6651 | { | |
6652 | /* Set up a step-resume breakpoint at the address | |
6653 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6654 | symtab_and_line sr_sal; |
488f131b | 6655 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6656 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6657 | |
a6d9a66e UW |
6658 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6659 | sr_sal, null_frame_id); | |
c5aa993b | 6660 | } |
c906108c | 6661 | |
488f131b JB |
6662 | keep_going (ecs); |
6663 | return; | |
6664 | } | |
c906108c | 6665 | |
1d509aa6 MM |
6666 | /* Step through an indirect branch thunk. */ |
6667 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6668 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6669 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 | 6670 | { |
edbcda09 | 6671 | infrun_log_debug ("stepped into indirect branch thunk"); |
1d509aa6 MM |
6672 | keep_going (ecs); |
6673 | return; | |
6674 | } | |
6675 | ||
16c381f0 JK |
6676 | if (ecs->event_thread->control.step_range_end != 1 |
6677 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6678 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6679 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6680 | { |
edbcda09 | 6681 | infrun_log_debug ("stepped into signal trampoline"); |
42edda50 | 6682 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6683 | a signal trampoline (either by a signal being delivered or by |
6684 | the signal handler returning). Just single-step until the | |
6685 | inferior leaves the trampoline (either by calling the handler | |
6686 | or returning). */ | |
488f131b JB |
6687 | keep_going (ecs); |
6688 | return; | |
6689 | } | |
c906108c | 6690 | |
14132e89 MR |
6691 | /* If we're in the return path from a shared library trampoline, |
6692 | we want to proceed through the trampoline when stepping. */ | |
6693 | /* macro/2012-04-25: This needs to come before the subroutine | |
6694 | call check below as on some targets return trampolines look | |
6695 | like subroutine calls (MIPS16 return thunks). */ | |
6696 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
6697 | ecs->event_thread->suspend.stop_pc, |
6698 | ecs->stop_func_name) | |
14132e89 MR |
6699 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6700 | { | |
6701 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
6702 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6703 | CORE_ADDR real_stop_pc | |
6704 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 | 6705 | |
edbcda09 | 6706 | infrun_log_debug ("stepped into solib return tramp"); |
14132e89 MR |
6707 | |
6708 | /* Only proceed through if we know where it's going. */ | |
6709 | if (real_stop_pc) | |
6710 | { | |
6711 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6712 | symtab_and_line sr_sal; |
14132e89 MR |
6713 | sr_sal.pc = real_stop_pc; |
6714 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6715 | sr_sal.pspace = get_frame_program_space (frame); | |
6716 | ||
6717 | /* Do not specify what the fp should be when we stop since | |
6718 | on some machines the prologue is where the new fp value | |
6719 | is established. */ | |
6720 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6721 | sr_sal, null_frame_id); | |
6722 | ||
6723 | /* Restart without fiddling with the step ranges or | |
6724 | other state. */ | |
6725 | keep_going (ecs); | |
6726 | return; | |
6727 | } | |
6728 | } | |
6729 | ||
c17eaafe DJ |
6730 | /* Check for subroutine calls. The check for the current frame |
6731 | equalling the step ID is not necessary - the check of the | |
6732 | previous frame's ID is sufficient - but it is a common case and | |
6733 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6734 | |
6735 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6736 | being equal, so to get into this block, both the current and | |
6737 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6738 | /* The outer_frame_id check is a heuristic to detect stepping |
6739 | through startup code. If we step over an instruction which | |
6740 | sets the stack pointer from an invalid value to a valid value, | |
6741 | we may detect that as a subroutine call from the mythical | |
6742 | "outermost" function. This could be fixed by marking | |
6743 | outermost frames as !stack_p,code_p,special_p. Then the | |
6744 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6745 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6746 | for more. */ |
edb3359d | 6747 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6748 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6749 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6750 | ecs->event_thread->control.step_stack_frame_id) |
6751 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6752 | outer_frame_id) |
885eeb5b | 6753 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 6754 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 6755 | { |
f2ffa92b | 6756 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 6757 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6758 | |
edbcda09 | 6759 | infrun_log_debug ("stepped into subroutine"); |
527159b7 | 6760 | |
b7a084be | 6761 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6762 | { |
6763 | /* I presume that step_over_calls is only 0 when we're | |
6764 | supposed to be stepping at the assembly language level | |
6765 | ("stepi"). Just stop. */ | |
388a8562 | 6766 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6767 | end_stepping_range (ecs); |
95918acb AC |
6768 | return; |
6769 | } | |
8fb3e588 | 6770 | |
388a8562 MS |
6771 | /* Reverse stepping through solib trampolines. */ |
6772 | ||
6773 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6774 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6775 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6776 | || (ecs->stop_func_start == 0 | |
6777 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6778 | { | |
6779 | /* Any solib trampoline code can be handled in reverse | |
6780 | by simply continuing to single-step. We have already | |
6781 | executed the solib function (backwards), and a few | |
6782 | steps will take us back through the trampoline to the | |
6783 | caller. */ | |
6784 | keep_going (ecs); | |
6785 | return; | |
6786 | } | |
6787 | ||
16c381f0 | 6788 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6789 | { |
b2175913 MS |
6790 | /* We're doing a "next". |
6791 | ||
6792 | Normal (forward) execution: set a breakpoint at the | |
6793 | callee's return address (the address at which the caller | |
6794 | will resume). | |
6795 | ||
6796 | Reverse (backward) execution. set the step-resume | |
6797 | breakpoint at the start of the function that we just | |
6798 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6799 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6800 | |
6801 | if (execution_direction == EXEC_REVERSE) | |
6802 | { | |
acf9414f JK |
6803 | /* If we're already at the start of the function, we've either |
6804 | just stepped backward into a single instruction function, | |
6805 | or stepped back out of a signal handler to the first instruction | |
6806 | of the function. Just keep going, which will single-step back | |
6807 | to the caller. */ | |
58c48e72 | 6808 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6809 | { |
acf9414f | 6810 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6811 | symtab_and_line sr_sal; |
acf9414f JK |
6812 | sr_sal.pc = ecs->stop_func_start; |
6813 | sr_sal.pspace = get_frame_program_space (frame); | |
6814 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6815 | sr_sal, null_frame_id); | |
6816 | } | |
b2175913 MS |
6817 | } |
6818 | else | |
568d6575 | 6819 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6820 | |
8567c30f AC |
6821 | keep_going (ecs); |
6822 | return; | |
6823 | } | |
a53c66de | 6824 | |
95918acb | 6825 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6826 | calling routine and the real function), locate the real |
6827 | function. That's what tells us (a) whether we want to step | |
6828 | into it at all, and (b) what prologue we want to run to the | |
6829 | end of, if we do step into it. */ | |
568d6575 | 6830 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6831 | if (real_stop_pc == 0) |
568d6575 | 6832 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6833 | if (real_stop_pc != 0) |
6834 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6835 | |
db5f024e | 6836 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6837 | { |
51abb421 | 6838 | symtab_and_line sr_sal; |
1b2bfbb9 | 6839 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6840 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6841 | |
a6d9a66e UW |
6842 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6843 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6844 | keep_going (ecs); |
6845 | return; | |
1b2bfbb9 RC |
6846 | } |
6847 | ||
95918acb | 6848 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6849 | thinking of stepping into and the function isn't on the skip |
6850 | list, step into it. | |
95918acb | 6851 | |
8fb3e588 AC |
6852 | If there are several symtabs at that PC (e.g. with include |
6853 | files), just want to know whether *any* of them have line | |
6854 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6855 | { |
6856 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6857 | |
95918acb | 6858 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6859 | if (tmp_sal.line != 0 |
85817405 | 6860 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
6861 | tmp_sal) |
6862 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 6863 | { |
b2175913 | 6864 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6865 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6866 | else |
568d6575 | 6867 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6868 | return; |
6869 | } | |
6870 | } | |
6871 | ||
6872 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6873 | set, we stop the step so that the user has a chance to switch |
6874 | in assembly mode. */ | |
16c381f0 | 6875 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6876 | && step_stop_if_no_debug) |
95918acb | 6877 | { |
bdc36728 | 6878 | end_stepping_range (ecs); |
95918acb AC |
6879 | return; |
6880 | } | |
6881 | ||
b2175913 MS |
6882 | if (execution_direction == EXEC_REVERSE) |
6883 | { | |
acf9414f JK |
6884 | /* If we're already at the start of the function, we've either just |
6885 | stepped backward into a single instruction function without line | |
6886 | number info, or stepped back out of a signal handler to the first | |
6887 | instruction of the function without line number info. Just keep | |
6888 | going, which will single-step back to the caller. */ | |
6889 | if (ecs->stop_func_start != stop_pc) | |
6890 | { | |
6891 | /* Set a breakpoint at callee's start address. | |
6892 | From there we can step once and be back in the caller. */ | |
51abb421 | 6893 | symtab_and_line sr_sal; |
acf9414f JK |
6894 | sr_sal.pc = ecs->stop_func_start; |
6895 | sr_sal.pspace = get_frame_program_space (frame); | |
6896 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6897 | sr_sal, null_frame_id); | |
6898 | } | |
b2175913 MS |
6899 | } |
6900 | else | |
6901 | /* Set a breakpoint at callee's return address (the address | |
6902 | at which the caller will resume). */ | |
568d6575 | 6903 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6904 | |
95918acb | 6905 | keep_going (ecs); |
488f131b | 6906 | return; |
488f131b | 6907 | } |
c906108c | 6908 | |
fdd654f3 MS |
6909 | /* Reverse stepping through solib trampolines. */ |
6910 | ||
6911 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6912 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 6913 | { |
f2ffa92b PA |
6914 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6915 | ||
fdd654f3 MS |
6916 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6917 | || (ecs->stop_func_start == 0 | |
6918 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6919 | { | |
6920 | /* Any solib trampoline code can be handled in reverse | |
6921 | by simply continuing to single-step. We have already | |
6922 | executed the solib function (backwards), and a few | |
6923 | steps will take us back through the trampoline to the | |
6924 | caller. */ | |
6925 | keep_going (ecs); | |
6926 | return; | |
6927 | } | |
6928 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6929 | { | |
6930 | /* Stepped backward into the solib dynsym resolver. | |
6931 | Set a breakpoint at its start and continue, then | |
6932 | one more step will take us out. */ | |
51abb421 | 6933 | symtab_and_line sr_sal; |
fdd654f3 | 6934 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 6935 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6936 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6937 | sr_sal, null_frame_id); | |
6938 | keep_going (ecs); | |
6939 | return; | |
6940 | } | |
6941 | } | |
6942 | ||
8c95582d AB |
6943 | /* This always returns the sal for the inner-most frame when we are in a |
6944 | stack of inlined frames, even if GDB actually believes that it is in a | |
6945 | more outer frame. This is checked for below by calls to | |
6946 | inline_skipped_frames. */ | |
f2ffa92b | 6947 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 6948 | |
1b2bfbb9 RC |
6949 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6950 | the trampoline processing logic, however, there are some trampolines | |
6951 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6952 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6953 | && ecs->stop_func_name == NULL |
2afb61aa | 6954 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6955 | { |
edbcda09 | 6956 | infrun_log_debug ("stepped into undebuggable function"); |
527159b7 | 6957 | |
1b2bfbb9 | 6958 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6959 | undebuggable function (where there is no debugging information |
6960 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6961 | inferior stopped). Since we want to skip this kind of code, |
6962 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6963 | function - unless the user has asked us not to (via |
6964 | set step-mode) or we no longer know how to get back | |
6965 | to the call site. */ | |
6966 | if (step_stop_if_no_debug | |
c7ce8faa | 6967 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6968 | { |
6969 | /* If we have no line number and the step-stop-if-no-debug | |
6970 | is set, we stop the step so that the user has a chance to | |
6971 | switch in assembly mode. */ | |
bdc36728 | 6972 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6973 | return; |
6974 | } | |
6975 | else | |
6976 | { | |
6977 | /* Set a breakpoint at callee's return address (the address | |
6978 | at which the caller will resume). */ | |
568d6575 | 6979 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6980 | keep_going (ecs); |
6981 | return; | |
6982 | } | |
6983 | } | |
6984 | ||
16c381f0 | 6985 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6986 | { |
6987 | /* It is stepi or nexti. We always want to stop stepping after | |
6988 | one instruction. */ | |
edbcda09 | 6989 | infrun_log_debug ("stepi/nexti"); |
bdc36728 | 6990 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6991 | return; |
6992 | } | |
6993 | ||
2afb61aa | 6994 | if (stop_pc_sal.line == 0) |
488f131b JB |
6995 | { |
6996 | /* We have no line number information. That means to stop | |
6997 | stepping (does this always happen right after one instruction, | |
6998 | when we do "s" in a function with no line numbers, | |
6999 | or can this happen as a result of a return or longjmp?). */ | |
edbcda09 | 7000 | infrun_log_debug ("line number info"); |
bdc36728 | 7001 | end_stepping_range (ecs); |
488f131b JB |
7002 | return; |
7003 | } | |
c906108c | 7004 | |
edb3359d DJ |
7005 | /* Look for "calls" to inlined functions, part one. If the inline |
7006 | frame machinery detected some skipped call sites, we have entered | |
7007 | a new inline function. */ | |
7008 | ||
7009 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7010 | ecs->event_thread->control.step_frame_id) |
00431a78 | 7011 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 7012 | { |
edbcda09 | 7013 | infrun_log_debug ("stepped into inlined function"); |
edb3359d | 7014 | |
51abb421 | 7015 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 7016 | |
16c381f0 | 7017 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
7018 | { |
7019 | /* For "step", we're going to stop. But if the call site | |
7020 | for this inlined function is on the same source line as | |
7021 | we were previously stepping, go down into the function | |
7022 | first. Otherwise stop at the call site. */ | |
7023 | ||
7024 | if (call_sal.line == ecs->event_thread->current_line | |
7025 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7026 | { |
7027 | step_into_inline_frame (ecs->event_thread); | |
7028 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7029 | { | |
7030 | keep_going (ecs); | |
7031 | return; | |
7032 | } | |
7033 | } | |
edb3359d | 7034 | |
bdc36728 | 7035 | end_stepping_range (ecs); |
edb3359d DJ |
7036 | return; |
7037 | } | |
7038 | else | |
7039 | { | |
7040 | /* For "next", we should stop at the call site if it is on a | |
7041 | different source line. Otherwise continue through the | |
7042 | inlined function. */ | |
7043 | if (call_sal.line == ecs->event_thread->current_line | |
7044 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7045 | keep_going (ecs); | |
7046 | else | |
bdc36728 | 7047 | end_stepping_range (ecs); |
edb3359d DJ |
7048 | return; |
7049 | } | |
7050 | } | |
7051 | ||
7052 | /* Look for "calls" to inlined functions, part two. If we are still | |
7053 | in the same real function we were stepping through, but we have | |
7054 | to go further up to find the exact frame ID, we are stepping | |
7055 | through a more inlined call beyond its call site. */ | |
7056 | ||
7057 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
7058 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7059 | ecs->event_thread->control.step_frame_id) |
edb3359d | 7060 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7061 | ecs->event_thread->control.step_frame_id)) |
edb3359d | 7062 | { |
edbcda09 | 7063 | infrun_log_debug ("stepping through inlined function"); |
edb3359d | 7064 | |
4a4c04f1 BE |
7065 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7066 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7067 | keep_going (ecs); |
7068 | else | |
bdc36728 | 7069 | end_stepping_range (ecs); |
edb3359d DJ |
7070 | return; |
7071 | } | |
7072 | ||
8c95582d | 7073 | bool refresh_step_info = true; |
f2ffa92b | 7074 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
7075 | && (ecs->event_thread->current_line != stop_pc_sal.line |
7076 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b | 7077 | { |
8c95582d AB |
7078 | if (stop_pc_sal.is_stmt) |
7079 | { | |
7080 | /* We are at the start of a different line. So stop. Note that | |
7081 | we don't stop if we step into the middle of a different line. | |
7082 | That is said to make things like for (;;) statements work | |
7083 | better. */ | |
edbcda09 | 7084 | infrun_log_debug ("infrun: stepped to a different line\n"); |
8c95582d AB |
7085 | end_stepping_range (ecs); |
7086 | return; | |
7087 | } | |
7088 | else if (frame_id_eq (get_frame_id (get_current_frame ()), | |
7089 | ecs->event_thread->control.step_frame_id)) | |
7090 | { | |
7091 | /* We are at the start of a different line, however, this line is | |
7092 | not marked as a statement, and we have not changed frame. We | |
7093 | ignore this line table entry, and continue stepping forward, | |
7094 | looking for a better place to stop. */ | |
7095 | refresh_step_info = false; | |
edbcda09 SM |
7096 | infrun_log_debug ("infrun: stepped to a different line, but " |
7097 | "it's not the start of a statement\n"); | |
8c95582d | 7098 | } |
488f131b | 7099 | } |
c906108c | 7100 | |
488f131b | 7101 | /* We aren't done stepping. |
c906108c | 7102 | |
488f131b JB |
7103 | Optimize by setting the stepping range to the line. |
7104 | (We might not be in the original line, but if we entered a | |
7105 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7106 | things like for(;;) statements work better.) |
7107 | ||
7108 | If we entered a SAL that indicates a non-statement line table entry, | |
7109 | then we update the stepping range, but we don't update the step info, | |
7110 | which includes things like the line number we are stepping away from. | |
7111 | This means we will stop when we find a line table entry that is marked | |
7112 | as is-statement, even if it matches the non-statement one we just | |
7113 | stepped into. */ | |
c906108c | 7114 | |
16c381f0 JK |
7115 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7116 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7117 | ecs->event_thread->control.may_range_step = 1; |
8c95582d AB |
7118 | if (refresh_step_info) |
7119 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7120 | |
edbcda09 | 7121 | infrun_log_debug ("keep going"); |
488f131b | 7122 | keep_going (ecs); |
104c1213 JM |
7123 | } |
7124 | ||
c447ac0b PA |
7125 | /* In all-stop mode, if we're currently stepping but have stopped in |
7126 | some other thread, we may need to switch back to the stepped | |
7127 | thread. Returns true we set the inferior running, false if we left | |
7128 | it stopped (and the event needs further processing). */ | |
7129 | ||
7130 | static int | |
7131 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
7132 | { | |
fbea99ea | 7133 | if (!target_is_non_stop_p ()) |
c447ac0b | 7134 | { |
99619bea PA |
7135 | struct thread_info *stepping_thread; |
7136 | ||
7137 | /* If any thread is blocked on some internal breakpoint, and we | |
7138 | simply need to step over that breakpoint to get it going | |
7139 | again, do that first. */ | |
7140 | ||
7141 | /* However, if we see an event for the stepping thread, then we | |
7142 | know all other threads have been moved past their breakpoints | |
7143 | already. Let the caller check whether the step is finished, | |
7144 | etc., before deciding to move it past a breakpoint. */ | |
7145 | if (ecs->event_thread->control.step_range_end != 0) | |
7146 | return 0; | |
7147 | ||
7148 | /* Check if the current thread is blocked on an incomplete | |
7149 | step-over, interrupted by a random signal. */ | |
7150 | if (ecs->event_thread->control.trap_expected | |
7151 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7152 | { |
edbcda09 SM |
7153 | infrun_log_debug ("need to finish step-over of [%s]", |
7154 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
99619bea PA |
7155 | keep_going (ecs); |
7156 | return 1; | |
7157 | } | |
2adfaa28 | 7158 | |
99619bea PA |
7159 | /* Check if the current thread is blocked by a single-step |
7160 | breakpoint of another thread. */ | |
7161 | if (ecs->hit_singlestep_breakpoint) | |
7162 | { | |
edbcda09 SM |
7163 | infrun_log_debug ("need to step [%s] over single-step breakpoint", |
7164 | target_pid_to_str (ecs->ptid).c_str ()); | |
99619bea PA |
7165 | keep_going (ecs); |
7166 | return 1; | |
7167 | } | |
7168 | ||
4d9d9d04 PA |
7169 | /* If this thread needs yet another step-over (e.g., stepping |
7170 | through a delay slot), do it first before moving on to | |
7171 | another thread. */ | |
7172 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7173 | { | |
edbcda09 SM |
7174 | infrun_log_debug |
7175 | ("thread [%s] still needs step-over", | |
7176 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
4d9d9d04 PA |
7177 | keep_going (ecs); |
7178 | return 1; | |
7179 | } | |
70509625 | 7180 | |
483805cf PA |
7181 | /* If scheduler locking applies even if not stepping, there's no |
7182 | need to walk over threads. Above we've checked whether the | |
7183 | current thread is stepping. If some other thread not the | |
7184 | event thread is stepping, then it must be that scheduler | |
7185 | locking is not in effect. */ | |
856e7dd6 | 7186 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
7187 | return 0; |
7188 | ||
4d9d9d04 PA |
7189 | /* Otherwise, we no longer expect a trap in the current thread. |
7190 | Clear the trap_expected flag before switching back -- this is | |
7191 | what keep_going does as well, if we call it. */ | |
7192 | ecs->event_thread->control.trap_expected = 0; | |
7193 | ||
7194 | /* Likewise, clear the signal if it should not be passed. */ | |
7195 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7196 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7197 | ||
7198 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 7199 | step/next/etc. */ |
4d9d9d04 PA |
7200 | if (start_step_over ()) |
7201 | { | |
7202 | prepare_to_wait (ecs); | |
7203 | return 1; | |
7204 | } | |
7205 | ||
7206 | /* Look for the stepping/nexting thread. */ | |
483805cf | 7207 | stepping_thread = NULL; |
4d9d9d04 | 7208 | |
08036331 | 7209 | for (thread_info *tp : all_non_exited_threads ()) |
483805cf | 7210 | { |
f3f8ece4 PA |
7211 | switch_to_thread_no_regs (tp); |
7212 | ||
fbea99ea PA |
7213 | /* Ignore threads of processes the caller is not |
7214 | resuming. */ | |
483805cf | 7215 | if (!sched_multi |
5b6d1e4f PA |
7216 | && (tp->inf->process_target () != ecs->target |
7217 | || tp->inf->pid != ecs->ptid.pid ())) | |
483805cf PA |
7218 | continue; |
7219 | ||
7220 | /* When stepping over a breakpoint, we lock all threads | |
7221 | except the one that needs to move past the breakpoint. | |
7222 | If a non-event thread has this set, the "incomplete | |
7223 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
7224 | if (tp->control.trap_expected) |
7225 | { | |
7226 | internal_error (__FILE__, __LINE__, | |
7227 | "[%s] has inconsistent state: " | |
7228 | "trap_expected=%d\n", | |
a068643d | 7229 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
7230 | tp->control.trap_expected); |
7231 | } | |
483805cf PA |
7232 | |
7233 | /* Did we find the stepping thread? */ | |
7234 | if (tp->control.step_range_end) | |
7235 | { | |
7236 | /* Yep. There should only one though. */ | |
7237 | gdb_assert (stepping_thread == NULL); | |
7238 | ||
7239 | /* The event thread is handled at the top, before we | |
7240 | enter this loop. */ | |
7241 | gdb_assert (tp != ecs->event_thread); | |
7242 | ||
7243 | /* If some thread other than the event thread is | |
7244 | stepping, then scheduler locking can't be in effect, | |
7245 | otherwise we wouldn't have resumed the current event | |
7246 | thread in the first place. */ | |
856e7dd6 | 7247 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
7248 | |
7249 | stepping_thread = tp; | |
7250 | } | |
99619bea PA |
7251 | } |
7252 | ||
483805cf | 7253 | if (stepping_thread != NULL) |
99619bea | 7254 | { |
edbcda09 | 7255 | infrun_log_debug ("switching back to stepped thread"); |
c447ac0b | 7256 | |
2ac7589c PA |
7257 | if (keep_going_stepped_thread (stepping_thread)) |
7258 | { | |
7259 | prepare_to_wait (ecs); | |
7260 | return 1; | |
7261 | } | |
7262 | } | |
f3f8ece4 PA |
7263 | |
7264 | switch_to_thread (ecs->event_thread); | |
2ac7589c | 7265 | } |
2adfaa28 | 7266 | |
2ac7589c PA |
7267 | return 0; |
7268 | } | |
2adfaa28 | 7269 | |
2ac7589c PA |
7270 | /* Set a previously stepped thread back to stepping. Returns true on |
7271 | success, false if the resume is not possible (e.g., the thread | |
7272 | vanished). */ | |
7273 | ||
7274 | static int | |
7275 | keep_going_stepped_thread (struct thread_info *tp) | |
7276 | { | |
7277 | struct frame_info *frame; | |
2ac7589c PA |
7278 | struct execution_control_state ecss; |
7279 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7280 | |
2ac7589c PA |
7281 | /* If the stepping thread exited, then don't try to switch back and |
7282 | resume it, which could fail in several different ways depending | |
7283 | on the target. Instead, just keep going. | |
2adfaa28 | 7284 | |
2ac7589c PA |
7285 | We can find a stepping dead thread in the thread list in two |
7286 | cases: | |
2adfaa28 | 7287 | |
2ac7589c PA |
7288 | - The target supports thread exit events, and when the target |
7289 | tries to delete the thread from the thread list, inferior_ptid | |
7290 | pointed at the exiting thread. In such case, calling | |
7291 | delete_thread does not really remove the thread from the list; | |
7292 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7293 | |
2ac7589c PA |
7294 | - The target's debug interface does not support thread exit |
7295 | events, and so we have no idea whatsoever if the previously | |
7296 | stepping thread is still alive. For that reason, we need to | |
7297 | synchronously query the target now. */ | |
2adfaa28 | 7298 | |
00431a78 | 7299 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c | 7300 | { |
edbcda09 SM |
7301 | infrun_log_debug ("not resuming previously stepped thread, it has " |
7302 | "vanished"); | |
2ac7589c | 7303 | |
00431a78 | 7304 | delete_thread (tp); |
2ac7589c | 7305 | return 0; |
c447ac0b | 7306 | } |
2ac7589c | 7307 | |
edbcda09 | 7308 | infrun_log_debug ("resuming previously stepped thread"); |
2ac7589c PA |
7309 | |
7310 | reset_ecs (ecs, tp); | |
00431a78 | 7311 | switch_to_thread (tp); |
2ac7589c | 7312 | |
f2ffa92b | 7313 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 7314 | frame = get_current_frame (); |
2ac7589c PA |
7315 | |
7316 | /* If the PC of the thread we were trying to single-step has | |
7317 | changed, then that thread has trapped or been signaled, but the | |
7318 | event has not been reported to GDB yet. Re-poll the target | |
7319 | looking for this particular thread's event (i.e. temporarily | |
7320 | enable schedlock) by: | |
7321 | ||
7322 | - setting a break at the current PC | |
7323 | - resuming that particular thread, only (by setting trap | |
7324 | expected) | |
7325 | ||
7326 | This prevents us continuously moving the single-step breakpoint | |
7327 | forward, one instruction at a time, overstepping. */ | |
7328 | ||
f2ffa92b | 7329 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
7330 | { |
7331 | ptid_t resume_ptid; | |
7332 | ||
edbcda09 SM |
7333 | infrun_log_debug ("expected thread advanced also (%s -> %s)", |
7334 | paddress (target_gdbarch (), tp->prev_pc), | |
7335 | paddress (target_gdbarch (), tp->suspend.stop_pc)); | |
2ac7589c PA |
7336 | |
7337 | /* Clear the info of the previous step-over, as it's no longer | |
7338 | valid (if the thread was trying to step over a breakpoint, it | |
7339 | has already succeeded). It's what keep_going would do too, | |
7340 | if we called it. Do this before trying to insert the sss | |
7341 | breakpoint, otherwise if we were previously trying to step | |
7342 | over this exact address in another thread, the breakpoint is | |
7343 | skipped. */ | |
7344 | clear_step_over_info (); | |
7345 | tp->control.trap_expected = 0; | |
7346 | ||
7347 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7348 | get_frame_address_space (frame), | |
f2ffa92b | 7349 | tp->suspend.stop_pc); |
2ac7589c | 7350 | |
719546c4 | 7351 | tp->resumed = true; |
fbea99ea | 7352 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7353 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7354 | } | |
7355 | else | |
7356 | { | |
edbcda09 | 7357 | infrun_log_debug ("expected thread still hasn't advanced"); |
2ac7589c PA |
7358 | |
7359 | keep_going_pass_signal (ecs); | |
7360 | } | |
7361 | return 1; | |
c447ac0b PA |
7362 | } |
7363 | ||
8b061563 PA |
7364 | /* Is thread TP in the middle of (software or hardware) |
7365 | single-stepping? (Note the result of this function must never be | |
7366 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7367 | |
a289b8f6 | 7368 | static int |
b3444185 | 7369 | currently_stepping (struct thread_info *tp) |
a7212384 | 7370 | { |
8358c15c JK |
7371 | return ((tp->control.step_range_end |
7372 | && tp->control.step_resume_breakpoint == NULL) | |
7373 | || tp->control.trap_expected | |
af48d08f | 7374 | || tp->stepped_breakpoint |
8358c15c | 7375 | || bpstat_should_step ()); |
a7212384 UW |
7376 | } |
7377 | ||
b2175913 MS |
7378 | /* Inferior has stepped into a subroutine call with source code that |
7379 | we should not step over. Do step to the first line of code in | |
7380 | it. */ | |
c2c6d25f JM |
7381 | |
7382 | static void | |
568d6575 UW |
7383 | handle_step_into_function (struct gdbarch *gdbarch, |
7384 | struct execution_control_state *ecs) | |
c2c6d25f | 7385 | { |
7e324e48 GB |
7386 | fill_in_stop_func (gdbarch, ecs); |
7387 | ||
f2ffa92b PA |
7388 | compunit_symtab *cust |
7389 | = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); | |
43f3e411 | 7390 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7391 | ecs->stop_func_start |
7392 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7393 | |
51abb421 | 7394 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7395 | /* Use the step_resume_break to step until the end of the prologue, |
7396 | even if that involves jumps (as it seems to on the vax under | |
7397 | 4.2). */ | |
7398 | /* If the prologue ends in the middle of a source line, continue to | |
7399 | the end of that source line (if it is still within the function). | |
7400 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7401 | if (stop_func_sal.end |
7402 | && stop_func_sal.pc != ecs->stop_func_start | |
7403 | && stop_func_sal.end < ecs->stop_func_end) | |
7404 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7405 | |
2dbd5e30 KB |
7406 | /* Architectures which require breakpoint adjustment might not be able |
7407 | to place a breakpoint at the computed address. If so, the test | |
7408 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7409 | ecs->stop_func_start to an address at which a breakpoint may be | |
7410 | legitimately placed. | |
8fb3e588 | 7411 | |
2dbd5e30 KB |
7412 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7413 | made, GDB will enter an infinite loop when stepping through | |
7414 | optimized code consisting of VLIW instructions which contain | |
7415 | subinstructions corresponding to different source lines. On | |
7416 | FR-V, it's not permitted to place a breakpoint on any but the | |
7417 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7418 | set, GDB will adjust the breakpoint address to the beginning of | |
7419 | the VLIW instruction. Thus, we need to make the corresponding | |
7420 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7421 | |
568d6575 | 7422 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7423 | { |
7424 | ecs->stop_func_start | |
568d6575 | 7425 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7426 | ecs->stop_func_start); |
2dbd5e30 KB |
7427 | } |
7428 | ||
f2ffa92b | 7429 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7430 | { |
7431 | /* We are already there: stop now. */ | |
bdc36728 | 7432 | end_stepping_range (ecs); |
c2c6d25f JM |
7433 | return; |
7434 | } | |
7435 | else | |
7436 | { | |
7437 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7438 | symtab_and_line sr_sal; |
c2c6d25f JM |
7439 | sr_sal.pc = ecs->stop_func_start; |
7440 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7441 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7442 | |
c2c6d25f | 7443 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7444 | some machines the prologue is where the new fp value is |
7445 | established. */ | |
a6d9a66e | 7446 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7447 | |
7448 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7449 | ecs->event_thread->control.step_range_end |
7450 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7451 | } |
7452 | keep_going (ecs); | |
7453 | } | |
d4f3574e | 7454 | |
b2175913 MS |
7455 | /* Inferior has stepped backward into a subroutine call with source |
7456 | code that we should not step over. Do step to the beginning of the | |
7457 | last line of code in it. */ | |
7458 | ||
7459 | static void | |
568d6575 UW |
7460 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7461 | struct execution_control_state *ecs) | |
b2175913 | 7462 | { |
43f3e411 | 7463 | struct compunit_symtab *cust; |
167e4384 | 7464 | struct symtab_and_line stop_func_sal; |
b2175913 | 7465 | |
7e324e48 GB |
7466 | fill_in_stop_func (gdbarch, ecs); |
7467 | ||
f2ffa92b | 7468 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7469 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7470 | ecs->stop_func_start |
7471 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7472 | |
f2ffa92b | 7473 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7474 | |
7475 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7476 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7477 | { |
7478 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7479 | end_stepping_range (ecs); |
b2175913 MS |
7480 | } |
7481 | else | |
7482 | { | |
7483 | /* Else just reset the step range and keep going. | |
7484 | No step-resume breakpoint, they don't work for | |
7485 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7486 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7487 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7488 | keep_going (ecs); |
7489 | } | |
7490 | return; | |
7491 | } | |
7492 | ||
d3169d93 | 7493 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7494 | This is used to both functions and to skip over code. */ |
7495 | ||
7496 | static void | |
2c03e5be PA |
7497 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7498 | struct symtab_and_line sr_sal, | |
7499 | struct frame_id sr_id, | |
7500 | enum bptype sr_type) | |
44cbf7b5 | 7501 | { |
611c83ae PA |
7502 | /* There should never be more than one step-resume or longjmp-resume |
7503 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7504 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7505 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7506 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 | 7507 | |
edbcda09 SM |
7508 | infrun_log_debug ("inserting step-resume breakpoint at %s", |
7509 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7510 | |
8358c15c | 7511 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7512 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7513 | } |
7514 | ||
9da8c2a0 | 7515 | void |
2c03e5be PA |
7516 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7517 | struct symtab_and_line sr_sal, | |
7518 | struct frame_id sr_id) | |
7519 | { | |
7520 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7521 | sr_sal, sr_id, | |
7522 | bp_step_resume); | |
44cbf7b5 | 7523 | } |
7ce450bd | 7524 | |
2c03e5be PA |
7525 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7526 | This is used to skip a potential signal handler. | |
7ce450bd | 7527 | |
14e60db5 DJ |
7528 | This is called with the interrupted function's frame. The signal |
7529 | handler, when it returns, will resume the interrupted function at | |
7530 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7531 | |
7532 | static void | |
2c03e5be | 7533 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7534 | { |
f4c1edd8 | 7535 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7536 | |
51abb421 PA |
7537 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7538 | ||
7539 | symtab_and_line sr_sal; | |
568d6575 | 7540 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7541 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7542 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7543 | |
2c03e5be PA |
7544 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7545 | get_stack_frame_id (return_frame), | |
7546 | bp_hp_step_resume); | |
d303a6c7 AC |
7547 | } |
7548 | ||
2c03e5be PA |
7549 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7550 | is used to skip a function after stepping into it (for "next" or if | |
7551 | the called function has no debugging information). | |
14e60db5 DJ |
7552 | |
7553 | The current function has almost always been reached by single | |
7554 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7555 | current function, and the breakpoint will be set at the caller's | |
7556 | resume address. | |
7557 | ||
7558 | This is a separate function rather than reusing | |
2c03e5be | 7559 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7560 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7561 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7562 | |
7563 | static void | |
7564 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7565 | { | |
14e60db5 DJ |
7566 | /* We shouldn't have gotten here if we don't know where the call site |
7567 | is. */ | |
c7ce8faa | 7568 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7569 | |
51abb421 | 7570 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7571 | |
51abb421 | 7572 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7573 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7574 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7575 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7576 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7577 | |
a6d9a66e | 7578 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7579 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7580 | } |
7581 | ||
611c83ae PA |
7582 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7583 | new breakpoint at the target of a jmp_buf. The handling of | |
7584 | longjmp-resume uses the same mechanisms used for handling | |
7585 | "step-resume" breakpoints. */ | |
7586 | ||
7587 | static void | |
a6d9a66e | 7588 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7589 | { |
e81a37f7 TT |
7590 | /* There should never be more than one longjmp-resume breakpoint per |
7591 | thread, so we should never be setting a new | |
611c83ae | 7592 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7593 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae | 7594 | |
edbcda09 SM |
7595 | infrun_log_debug ("inserting longjmp-resume breakpoint at %s", |
7596 | paddress (gdbarch, pc)); | |
611c83ae | 7597 | |
e81a37f7 | 7598 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7599 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7600 | } |
7601 | ||
186c406b TT |
7602 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7603 | the exception. The block B is the block of the unwinder debug hook | |
7604 | function. FRAME is the frame corresponding to the call to this | |
7605 | function. SYM is the symbol of the function argument holding the | |
7606 | target PC of the exception. */ | |
7607 | ||
7608 | static void | |
7609 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7610 | const struct block *b, |
186c406b TT |
7611 | struct frame_info *frame, |
7612 | struct symbol *sym) | |
7613 | { | |
a70b8144 | 7614 | try |
186c406b | 7615 | { |
63e43d3a | 7616 | struct block_symbol vsym; |
186c406b TT |
7617 | struct value *value; |
7618 | CORE_ADDR handler; | |
7619 | struct breakpoint *bp; | |
7620 | ||
987012b8 | 7621 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 7622 | b, VAR_DOMAIN); |
63e43d3a | 7623 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7624 | /* If the value was optimized out, revert to the old behavior. */ |
7625 | if (! value_optimized_out (value)) | |
7626 | { | |
7627 | handler = value_as_address (value); | |
7628 | ||
edbcda09 SM |
7629 | infrun_log_debug ("exception resume at %lx", |
7630 | (unsigned long) handler); | |
186c406b TT |
7631 | |
7632 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7633 | handler, |
7634 | bp_exception_resume).release (); | |
c70a6932 JK |
7635 | |
7636 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7637 | frame = NULL; | |
7638 | ||
5d5658a1 | 7639 | bp->thread = tp->global_num; |
186c406b TT |
7640 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7641 | } | |
7642 | } | |
230d2906 | 7643 | catch (const gdb_exception_error &e) |
492d29ea PA |
7644 | { |
7645 | /* We want to ignore errors here. */ | |
7646 | } | |
186c406b TT |
7647 | } |
7648 | ||
28106bc2 SDJ |
7649 | /* A helper for check_exception_resume that sets an |
7650 | exception-breakpoint based on a SystemTap probe. */ | |
7651 | ||
7652 | static void | |
7653 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7654 | const struct bound_probe *probe, |
28106bc2 SDJ |
7655 | struct frame_info *frame) |
7656 | { | |
7657 | struct value *arg_value; | |
7658 | CORE_ADDR handler; | |
7659 | struct breakpoint *bp; | |
7660 | ||
7661 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7662 | if (!arg_value) | |
7663 | return; | |
7664 | ||
7665 | handler = value_as_address (arg_value); | |
7666 | ||
edbcda09 SM |
7667 | infrun_log_debug ("exception resume at %s", |
7668 | paddress (probe->objfile->arch (), handler)); | |
28106bc2 SDJ |
7669 | |
7670 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7671 | handler, bp_exception_resume).release (); |
5d5658a1 | 7672 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7673 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7674 | } | |
7675 | ||
186c406b TT |
7676 | /* This is called when an exception has been intercepted. Check to |
7677 | see whether the exception's destination is of interest, and if so, | |
7678 | set an exception resume breakpoint there. */ | |
7679 | ||
7680 | static void | |
7681 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7682 | struct frame_info *frame) |
186c406b | 7683 | { |
729662a5 | 7684 | struct bound_probe probe; |
28106bc2 SDJ |
7685 | struct symbol *func; |
7686 | ||
7687 | /* First see if this exception unwinding breakpoint was set via a | |
7688 | SystemTap probe point. If so, the probe has two arguments: the | |
7689 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7690 | set a breakpoint there. */ | |
6bac7473 | 7691 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7692 | if (probe.prob) |
28106bc2 | 7693 | { |
729662a5 | 7694 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7695 | return; |
7696 | } | |
7697 | ||
7698 | func = get_frame_function (frame); | |
7699 | if (!func) | |
7700 | return; | |
186c406b | 7701 | |
a70b8144 | 7702 | try |
186c406b | 7703 | { |
3977b71f | 7704 | const struct block *b; |
8157b174 | 7705 | struct block_iterator iter; |
186c406b TT |
7706 | struct symbol *sym; |
7707 | int argno = 0; | |
7708 | ||
7709 | /* The exception breakpoint is a thread-specific breakpoint on | |
7710 | the unwinder's debug hook, declared as: | |
7711 | ||
7712 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7713 | ||
7714 | The CFA argument indicates the frame to which control is | |
7715 | about to be transferred. HANDLER is the destination PC. | |
7716 | ||
7717 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7718 | This is not extremely efficient but it avoids issues in gdb | |
7719 | with computing the DWARF CFA, and it also works even in weird | |
7720 | cases such as throwing an exception from inside a signal | |
7721 | handler. */ | |
7722 | ||
7723 | b = SYMBOL_BLOCK_VALUE (func); | |
7724 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7725 | { | |
7726 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7727 | continue; | |
7728 | ||
7729 | if (argno == 0) | |
7730 | ++argno; | |
7731 | else | |
7732 | { | |
7733 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7734 | b, frame, sym); | |
7735 | break; | |
7736 | } | |
7737 | } | |
7738 | } | |
230d2906 | 7739 | catch (const gdb_exception_error &e) |
492d29ea PA |
7740 | { |
7741 | } | |
186c406b TT |
7742 | } |
7743 | ||
104c1213 | 7744 | static void |
22bcd14b | 7745 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7746 | { |
edbcda09 | 7747 | infrun_log_debug ("stop_waiting"); |
527159b7 | 7748 | |
cd0fc7c3 SS |
7749 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7750 | ecs->wait_some_more = 0; | |
fbea99ea | 7751 | |
53cccef1 | 7752 | /* If all-stop, but there exists a non-stop target, stop all |
fbea99ea | 7753 | threads now that we're presenting the stop to the user. */ |
53cccef1 | 7754 | if (!non_stop && exists_non_stop_target ()) |
fbea99ea | 7755 | stop_all_threads (); |
cd0fc7c3 SS |
7756 | } |
7757 | ||
4d9d9d04 PA |
7758 | /* Like keep_going, but passes the signal to the inferior, even if the |
7759 | signal is set to nopass. */ | |
d4f3574e SS |
7760 | |
7761 | static void | |
4d9d9d04 | 7762 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7763 | { |
d7e15655 | 7764 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 7765 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7766 | |
d4f3574e | 7767 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 7768 | ecs->event_thread->prev_pc |
fc75c28b | 7769 | = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 7770 | |
4d9d9d04 | 7771 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7772 | { |
4d9d9d04 PA |
7773 | struct thread_info *tp = ecs->event_thread; |
7774 | ||
edbcda09 SM |
7775 | infrun_log_debug ("%s has trap_expected set, " |
7776 | "resuming to collect trap", | |
7777 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 | 7778 | |
a9ba6bae PA |
7779 | /* We haven't yet gotten our trap, and either: intercepted a |
7780 | non-signal event (e.g., a fork); or took a signal which we | |
7781 | are supposed to pass through to the inferior. Simply | |
7782 | continue. */ | |
64ce06e4 | 7783 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7784 | } |
372316f1 PA |
7785 | else if (step_over_info_valid_p ()) |
7786 | { | |
7787 | /* Another thread is stepping over a breakpoint in-line. If | |
7788 | this thread needs a step-over too, queue the request. In | |
7789 | either case, this resume must be deferred for later. */ | |
7790 | struct thread_info *tp = ecs->event_thread; | |
7791 | ||
7792 | if (ecs->hit_singlestep_breakpoint | |
7793 | || thread_still_needs_step_over (tp)) | |
7794 | { | |
edbcda09 SM |
7795 | infrun_log_debug ("step-over already in progress: " |
7796 | "step-over for %s deferred", | |
7797 | target_pid_to_str (tp->ptid).c_str ()); | |
7bd43605 | 7798 | global_thread_step_over_chain_enqueue (tp); |
372316f1 PA |
7799 | } |
7800 | else | |
7801 | { | |
edbcda09 SM |
7802 | infrun_log_debug ("step-over in progress: resume of %s deferred", |
7803 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 7804 | } |
372316f1 | 7805 | } |
d4f3574e SS |
7806 | else |
7807 | { | |
31e77af2 | 7808 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7809 | int remove_bp; |
7810 | int remove_wps; | |
8d297bbf | 7811 | step_over_what step_what; |
31e77af2 | 7812 | |
d4f3574e | 7813 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7814 | anyway (if we got a signal, the user asked it be passed to |
7815 | the child) | |
7816 | -- or -- | |
7817 | We got our expected trap, but decided we should resume from | |
7818 | it. | |
d4f3574e | 7819 | |
a9ba6bae | 7820 | We're going to run this baby now! |
d4f3574e | 7821 | |
c36b740a VP |
7822 | Note that insert_breakpoints won't try to re-insert |
7823 | already inserted breakpoints. Therefore, we don't | |
7824 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7825 | |
31e77af2 PA |
7826 | /* If we need to step over a breakpoint, and we're not using |
7827 | displaced stepping to do so, insert all breakpoints | |
7828 | (watchpoints, etc.) but the one we're stepping over, step one | |
7829 | instruction, and then re-insert the breakpoint when that step | |
7830 | is finished. */ | |
963f9c80 | 7831 | |
6c4cfb24 PA |
7832 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7833 | ||
963f9c80 | 7834 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7835 | || (step_what & STEP_OVER_BREAKPOINT)); |
7836 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7837 | |
cb71640d PA |
7838 | /* We can't use displaced stepping if we need to step past a |
7839 | watchpoint. The instruction copied to the scratch pad would | |
7840 | still trigger the watchpoint. */ | |
7841 | if (remove_bp | |
3fc8eb30 | 7842 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7843 | { |
a01bda52 | 7844 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
7845 | regcache_read_pc (regcache), remove_wps, |
7846 | ecs->event_thread->global_num); | |
45e8c884 | 7847 | } |
963f9c80 | 7848 | else if (remove_wps) |
21edc42f | 7849 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
7850 | |
7851 | /* If we now need to do an in-line step-over, we need to stop | |
7852 | all other threads. Note this must be done before | |
7853 | insert_breakpoints below, because that removes the breakpoint | |
7854 | we're about to step over, otherwise other threads could miss | |
7855 | it. */ | |
fbea99ea | 7856 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7857 | stop_all_threads (); |
abbb1732 | 7858 | |
31e77af2 | 7859 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 7860 | try |
31e77af2 PA |
7861 | { |
7862 | insert_breakpoints (); | |
7863 | } | |
230d2906 | 7864 | catch (const gdb_exception_error &e) |
31e77af2 PA |
7865 | { |
7866 | exception_print (gdb_stderr, e); | |
22bcd14b | 7867 | stop_waiting (ecs); |
bdf2a94a | 7868 | clear_step_over_info (); |
31e77af2 | 7869 | return; |
d4f3574e SS |
7870 | } |
7871 | ||
963f9c80 | 7872 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7873 | |
64ce06e4 | 7874 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7875 | } |
7876 | ||
488f131b | 7877 | prepare_to_wait (ecs); |
d4f3574e SS |
7878 | } |
7879 | ||
4d9d9d04 PA |
7880 | /* Called when we should continue running the inferior, because the |
7881 | current event doesn't cause a user visible stop. This does the | |
7882 | resuming part; waiting for the next event is done elsewhere. */ | |
7883 | ||
7884 | static void | |
7885 | keep_going (struct execution_control_state *ecs) | |
7886 | { | |
7887 | if (ecs->event_thread->control.trap_expected | |
7888 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7889 | ecs->event_thread->control.trap_expected = 0; | |
7890 | ||
7891 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7892 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7893 | keep_going_pass_signal (ecs); | |
7894 | } | |
7895 | ||
104c1213 JM |
7896 | /* This function normally comes after a resume, before |
7897 | handle_inferior_event exits. It takes care of any last bits of | |
7898 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7899 | |
104c1213 JM |
7900 | static void |
7901 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7902 | { |
edbcda09 | 7903 | infrun_log_debug ("prepare_to_wait"); |
104c1213 | 7904 | |
104c1213 | 7905 | ecs->wait_some_more = 1; |
0b333c5e | 7906 | |
0e2dba2d PA |
7907 | /* If the target can't async, emulate it by marking the infrun event |
7908 | handler such that as soon as we get back to the event-loop, we | |
7909 | immediately end up in fetch_inferior_event again calling | |
7910 | target_wait. */ | |
7911 | if (!target_can_async_p ()) | |
0b333c5e | 7912 | mark_infrun_async_event_handler (); |
c906108c | 7913 | } |
11cf8741 | 7914 | |
fd664c91 | 7915 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7916 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7917 | |
7918 | static void | |
bdc36728 | 7919 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7920 | { |
bdc36728 | 7921 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7922 | stop_waiting (ecs); |
fd664c91 PA |
7923 | } |
7924 | ||
33d62d64 JK |
7925 | /* Several print_*_reason functions to print why the inferior has stopped. |
7926 | We always print something when the inferior exits, or receives a signal. | |
7927 | The rest of the cases are dealt with later on in normal_stop and | |
7928 | print_it_typical. Ideally there should be a call to one of these | |
7929 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7930 | stop_waiting is called. |
33d62d64 | 7931 | |
fd664c91 PA |
7932 | Note that we don't call these directly, instead we delegate that to |
7933 | the interpreters, through observers. Interpreters then call these | |
7934 | with whatever uiout is right. */ | |
33d62d64 | 7935 | |
fd664c91 PA |
7936 | void |
7937 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7938 | { |
fd664c91 | 7939 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7940 | |
112e8700 | 7941 | if (uiout->is_mi_like_p ()) |
fd664c91 | 7942 | { |
112e8700 | 7943 | uiout->field_string ("reason", |
fd664c91 PA |
7944 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
7945 | } | |
7946 | } | |
33d62d64 | 7947 | |
fd664c91 PA |
7948 | void |
7949 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7950 | { |
33d62d64 | 7951 | annotate_signalled (); |
112e8700 SM |
7952 | if (uiout->is_mi_like_p ()) |
7953 | uiout->field_string | |
7954 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7955 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 7956 | annotate_signal_name (); |
112e8700 | 7957 | uiout->field_string ("signal-name", |
2ea28649 | 7958 | gdb_signal_to_name (siggnal)); |
33d62d64 | 7959 | annotate_signal_name_end (); |
112e8700 | 7960 | uiout->text (", "); |
33d62d64 | 7961 | annotate_signal_string (); |
112e8700 | 7962 | uiout->field_string ("signal-meaning", |
2ea28649 | 7963 | gdb_signal_to_string (siggnal)); |
33d62d64 | 7964 | annotate_signal_string_end (); |
112e8700 SM |
7965 | uiout->text (".\n"); |
7966 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
7967 | } |
7968 | ||
fd664c91 PA |
7969 | void |
7970 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7971 | { |
fda326dd | 7972 | struct inferior *inf = current_inferior (); |
a068643d | 7973 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 7974 | |
33d62d64 JK |
7975 | annotate_exited (exitstatus); |
7976 | if (exitstatus) | |
7977 | { | |
112e8700 SM |
7978 | if (uiout->is_mi_like_p ()) |
7979 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
7980 | std::string exit_code_str |
7981 | = string_printf ("0%o", (unsigned int) exitstatus); | |
7982 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
7983 | plongest (inf->num), pidstr.c_str (), | |
7984 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
7985 | } |
7986 | else | |
11cf8741 | 7987 | { |
112e8700 SM |
7988 | if (uiout->is_mi_like_p ()) |
7989 | uiout->field_string | |
7990 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
7991 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
7992 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 7993 | } |
33d62d64 JK |
7994 | } |
7995 | ||
012b3a21 WT |
7996 | /* Some targets/architectures can do extra processing/display of |
7997 | segmentation faults. E.g., Intel MPX boundary faults. | |
7998 | Call the architecture dependent function to handle the fault. */ | |
7999 | ||
8000 | static void | |
8001 | handle_segmentation_fault (struct ui_out *uiout) | |
8002 | { | |
8003 | struct regcache *regcache = get_current_regcache (); | |
ac7936df | 8004 | struct gdbarch *gdbarch = regcache->arch (); |
012b3a21 WT |
8005 | |
8006 | if (gdbarch_handle_segmentation_fault_p (gdbarch)) | |
8007 | gdbarch_handle_segmentation_fault (gdbarch, uiout); | |
8008 | } | |
8009 | ||
fd664c91 PA |
8010 | void |
8011 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 8012 | { |
f303dbd6 PA |
8013 | struct thread_info *thr = inferior_thread (); |
8014 | ||
33d62d64 JK |
8015 | annotate_signal (); |
8016 | ||
112e8700 | 8017 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
8018 | ; |
8019 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 8020 | { |
f303dbd6 | 8021 | const char *name; |
33d62d64 | 8022 | |
112e8700 | 8023 | uiout->text ("\nThread "); |
33eca680 | 8024 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 PA |
8025 | |
8026 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
8027 | if (name != NULL) | |
8028 | { | |
112e8700 | 8029 | uiout->text (" \""); |
33eca680 | 8030 | uiout->field_string ("name", name); |
112e8700 | 8031 | uiout->text ("\""); |
f303dbd6 | 8032 | } |
33d62d64 | 8033 | } |
f303dbd6 | 8034 | else |
112e8700 | 8035 | uiout->text ("\nProgram"); |
f303dbd6 | 8036 | |
112e8700 SM |
8037 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8038 | uiout->text (" stopped"); | |
33d62d64 JK |
8039 | else |
8040 | { | |
112e8700 | 8041 | uiout->text (" received signal "); |
8b93c638 | 8042 | annotate_signal_name (); |
112e8700 SM |
8043 | if (uiout->is_mi_like_p ()) |
8044 | uiout->field_string | |
8045 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8046 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8047 | annotate_signal_name_end (); |
112e8700 | 8048 | uiout->text (", "); |
8b93c638 | 8049 | annotate_signal_string (); |
112e8700 | 8050 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 WT |
8051 | |
8052 | if (siggnal == GDB_SIGNAL_SEGV) | |
8053 | handle_segmentation_fault (uiout); | |
8054 | ||
8b93c638 | 8055 | annotate_signal_string_end (); |
33d62d64 | 8056 | } |
112e8700 | 8057 | uiout->text (".\n"); |
33d62d64 | 8058 | } |
252fbfc8 | 8059 | |
fd664c91 PA |
8060 | void |
8061 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8062 | { |
112e8700 | 8063 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8064 | } |
43ff13b4 | 8065 | |
0c7e1a46 PA |
8066 | /* Print current location without a level number, if we have changed |
8067 | functions or hit a breakpoint. Print source line if we have one. | |
8068 | bpstat_print contains the logic deciding in detail what to print, | |
8069 | based on the event(s) that just occurred. */ | |
8070 | ||
243a9253 PA |
8071 | static void |
8072 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8073 | { |
8074 | int bpstat_ret; | |
f486487f | 8075 | enum print_what source_flag; |
0c7e1a46 PA |
8076 | int do_frame_printing = 1; |
8077 | struct thread_info *tp = inferior_thread (); | |
8078 | ||
8079 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8080 | switch (bpstat_ret) | |
8081 | { | |
8082 | case PRINT_UNKNOWN: | |
8083 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8084 | should) carry around the function and does (or should) use | |
8085 | that when doing a frame comparison. */ | |
8086 | if (tp->control.stop_step | |
8087 | && frame_id_eq (tp->control.step_frame_id, | |
8088 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
8089 | && (tp->control.step_start_function |
8090 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
8091 | { |
8092 | /* Finished step, just print source line. */ | |
8093 | source_flag = SRC_LINE; | |
8094 | } | |
8095 | else | |
8096 | { | |
8097 | /* Print location and source line. */ | |
8098 | source_flag = SRC_AND_LOC; | |
8099 | } | |
8100 | break; | |
8101 | case PRINT_SRC_AND_LOC: | |
8102 | /* Print location and source line. */ | |
8103 | source_flag = SRC_AND_LOC; | |
8104 | break; | |
8105 | case PRINT_SRC_ONLY: | |
8106 | source_flag = SRC_LINE; | |
8107 | break; | |
8108 | case PRINT_NOTHING: | |
8109 | /* Something bogus. */ | |
8110 | source_flag = SRC_LINE; | |
8111 | do_frame_printing = 0; | |
8112 | break; | |
8113 | default: | |
8114 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8115 | } | |
8116 | ||
8117 | /* The behavior of this routine with respect to the source | |
8118 | flag is: | |
8119 | SRC_LINE: Print only source line | |
8120 | LOCATION: Print only location | |
8121 | SRC_AND_LOC: Print location and source line. */ | |
8122 | if (do_frame_printing) | |
8123 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8124 | } |
8125 | ||
243a9253 PA |
8126 | /* See infrun.h. */ |
8127 | ||
8128 | void | |
4c7d57e7 | 8129 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8130 | { |
243a9253 | 8131 | struct target_waitstatus last; |
243a9253 PA |
8132 | struct thread_info *tp; |
8133 | ||
5b6d1e4f | 8134 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8135 | |
67ad9399 TT |
8136 | { |
8137 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8138 | |
67ad9399 | 8139 | print_stop_location (&last); |
243a9253 | 8140 | |
67ad9399 | 8141 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8142 | if (displays) |
8143 | do_displays (); | |
67ad9399 | 8144 | } |
243a9253 PA |
8145 | |
8146 | tp = inferior_thread (); | |
8147 | if (tp->thread_fsm != NULL | |
46e3ed7f | 8148 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
8149 | { |
8150 | struct return_value_info *rv; | |
8151 | ||
46e3ed7f | 8152 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
8153 | if (rv != NULL) |
8154 | print_return_value (uiout, rv); | |
8155 | } | |
0c7e1a46 PA |
8156 | } |
8157 | ||
388a7084 PA |
8158 | /* See infrun.h. */ |
8159 | ||
8160 | void | |
8161 | maybe_remove_breakpoints (void) | |
8162 | { | |
8163 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
8164 | { | |
8165 | if (remove_breakpoints ()) | |
8166 | { | |
223ffa71 | 8167 | target_terminal::ours_for_output (); |
388a7084 PA |
8168 | printf_filtered (_("Cannot remove breakpoints because " |
8169 | "program is no longer writable.\nFurther " | |
8170 | "execution is probably impossible.\n")); | |
8171 | } | |
8172 | } | |
8173 | } | |
8174 | ||
4c2f2a79 PA |
8175 | /* The execution context that just caused a normal stop. */ |
8176 | ||
8177 | struct stop_context | |
8178 | { | |
2d844eaf TT |
8179 | stop_context (); |
8180 | ~stop_context (); | |
8181 | ||
8182 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8183 | ||
8184 | bool changed () const; | |
8185 | ||
4c2f2a79 PA |
8186 | /* The stop ID. */ |
8187 | ULONGEST stop_id; | |
c906108c | 8188 | |
4c2f2a79 | 8189 | /* The event PTID. */ |
c906108c | 8190 | |
4c2f2a79 PA |
8191 | ptid_t ptid; |
8192 | ||
8193 | /* If stopp for a thread event, this is the thread that caused the | |
8194 | stop. */ | |
8195 | struct thread_info *thread; | |
8196 | ||
8197 | /* The inferior that caused the stop. */ | |
8198 | int inf_num; | |
8199 | }; | |
8200 | ||
2d844eaf | 8201 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8202 | takes a strong reference to the thread. */ |
8203 | ||
2d844eaf | 8204 | stop_context::stop_context () |
4c2f2a79 | 8205 | { |
2d844eaf TT |
8206 | stop_id = get_stop_id (); |
8207 | ptid = inferior_ptid; | |
8208 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8209 | |
d7e15655 | 8210 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8211 | { |
8212 | /* Take a strong reference so that the thread can't be deleted | |
8213 | yet. */ | |
2d844eaf TT |
8214 | thread = inferior_thread (); |
8215 | thread->incref (); | |
4c2f2a79 PA |
8216 | } |
8217 | else | |
2d844eaf | 8218 | thread = NULL; |
4c2f2a79 PA |
8219 | } |
8220 | ||
8221 | /* Release a stop context previously created with save_stop_context. | |
8222 | Releases the strong reference to the thread as well. */ | |
8223 | ||
2d844eaf | 8224 | stop_context::~stop_context () |
4c2f2a79 | 8225 | { |
2d844eaf TT |
8226 | if (thread != NULL) |
8227 | thread->decref (); | |
4c2f2a79 PA |
8228 | } |
8229 | ||
8230 | /* Return true if the current context no longer matches the saved stop | |
8231 | context. */ | |
8232 | ||
2d844eaf TT |
8233 | bool |
8234 | stop_context::changed () const | |
8235 | { | |
8236 | if (ptid != inferior_ptid) | |
8237 | return true; | |
8238 | if (inf_num != current_inferior ()->num) | |
8239 | return true; | |
8240 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8241 | return true; | |
8242 | if (get_stop_id () != stop_id) | |
8243 | return true; | |
8244 | return false; | |
4c2f2a79 PA |
8245 | } |
8246 | ||
8247 | /* See infrun.h. */ | |
8248 | ||
8249 | int | |
96baa820 | 8250 | normal_stop (void) |
c906108c | 8251 | { |
73b65bb0 | 8252 | struct target_waitstatus last; |
73b65bb0 | 8253 | |
5b6d1e4f | 8254 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8255 | |
4c2f2a79 PA |
8256 | new_stop_id (); |
8257 | ||
29f49a6a PA |
8258 | /* If an exception is thrown from this point on, make sure to |
8259 | propagate GDB's knowledge of the executing state to the | |
8260 | frontend/user running state. A QUIT is an easy exception to see | |
8261 | here, so do this before any filtered output. */ | |
731f534f | 8262 | |
5b6d1e4f | 8263 | ptid_t finish_ptid = null_ptid; |
731f534f | 8264 | |
c35b1492 | 8265 | if (!non_stop) |
5b6d1e4f | 8266 | finish_ptid = minus_one_ptid; |
e1316e60 PA |
8267 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8268 | || last.kind == TARGET_WAITKIND_EXITED) | |
8269 | { | |
8270 | /* On some targets, we may still have live threads in the | |
8271 | inferior when we get a process exit event. E.g., for | |
8272 | "checkpoint", when the current checkpoint/fork exits, | |
8273 | linux-fork.c automatically switches to another fork from | |
8274 | within target_mourn_inferior. */ | |
731f534f | 8275 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8276 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 PA |
8277 | } |
8278 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5b6d1e4f PA |
8279 | finish_ptid = inferior_ptid; |
8280 | ||
8281 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8282 | if (finish_ptid != null_ptid) | |
8283 | { | |
8284 | maybe_finish_thread_state.emplace | |
8285 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8286 | } | |
29f49a6a | 8287 | |
b57bacec PA |
8288 | /* As we're presenting a stop, and potentially removing breakpoints, |
8289 | update the thread list so we can tell whether there are threads | |
8290 | running on the target. With target remote, for example, we can | |
8291 | only learn about new threads when we explicitly update the thread | |
8292 | list. Do this before notifying the interpreters about signal | |
8293 | stops, end of stepping ranges, etc., so that the "new thread" | |
8294 | output is emitted before e.g., "Program received signal FOO", | |
8295 | instead of after. */ | |
8296 | update_thread_list (); | |
8297 | ||
8298 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 8299 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 8300 | |
c906108c SS |
8301 | /* As with the notification of thread events, we want to delay |
8302 | notifying the user that we've switched thread context until | |
8303 | the inferior actually stops. | |
8304 | ||
73b65bb0 DJ |
8305 | There's no point in saying anything if the inferior has exited. |
8306 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8307 | "received a signal". |
8308 | ||
8309 | Also skip saying anything in non-stop mode. In that mode, as we | |
8310 | don't want GDB to switch threads behind the user's back, to avoid | |
8311 | races where the user is typing a command to apply to thread x, | |
8312 | but GDB switches to thread y before the user finishes entering | |
8313 | the command, fetch_inferior_event installs a cleanup to restore | |
8314 | the current thread back to the thread the user had selected right | |
8315 | after this event is handled, so we're not really switching, only | |
8316 | informing of a stop. */ | |
4f8d22e3 | 8317 | if (!non_stop |
731f534f | 8318 | && previous_inferior_ptid != inferior_ptid |
73b65bb0 DJ |
8319 | && target_has_execution |
8320 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8321 | && last.kind != TARGET_WAITKIND_EXITED |
8322 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8323 | { |
0e454242 | 8324 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8325 | { |
223ffa71 | 8326 | target_terminal::ours_for_output (); |
3b12939d | 8327 | printf_filtered (_("[Switching to %s]\n"), |
a068643d | 8328 | target_pid_to_str (inferior_ptid).c_str ()); |
3b12939d PA |
8329 | annotate_thread_changed (); |
8330 | } | |
39f77062 | 8331 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8332 | } |
c906108c | 8333 | |
0e5bf2a8 PA |
8334 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8335 | { | |
0e454242 | 8336 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8337 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8338 | { | |
223ffa71 | 8339 | target_terminal::ours_for_output (); |
3b12939d PA |
8340 | printf_filtered (_("No unwaited-for children left.\n")); |
8341 | } | |
0e5bf2a8 PA |
8342 | } |
8343 | ||
b57bacec | 8344 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8345 | maybe_remove_breakpoints (); |
c906108c | 8346 | |
c906108c SS |
8347 | /* If an auto-display called a function and that got a signal, |
8348 | delete that auto-display to avoid an infinite recursion. */ | |
8349 | ||
8350 | if (stopped_by_random_signal) | |
8351 | disable_current_display (); | |
8352 | ||
0e454242 | 8353 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8354 | { |
8355 | async_enable_stdin (); | |
8356 | } | |
c906108c | 8357 | |
388a7084 | 8358 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8359 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8360 | |
8361 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8362 | and current location is based on that. Handle the case where the | |
8363 | dummy call is returning after being stopped. E.g. the dummy call | |
8364 | previously hit a breakpoint. (If the dummy call returns | |
8365 | normally, we won't reach here.) Do this before the stop hook is | |
8366 | run, so that it doesn't get to see the temporary dummy frame, | |
8367 | which is not where we'll present the stop. */ | |
8368 | if (has_stack_frames ()) | |
8369 | { | |
8370 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8371 | { | |
8372 | /* Pop the empty frame that contains the stack dummy. This | |
8373 | also restores inferior state prior to the call (struct | |
8374 | infcall_suspend_state). */ | |
8375 | struct frame_info *frame = get_current_frame (); | |
8376 | ||
8377 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8378 | frame_pop (frame); | |
8379 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8380 | does which means there's now no selected frame. */ | |
8381 | } | |
8382 | ||
8383 | select_frame (get_current_frame ()); | |
8384 | ||
8385 | /* Set the current source location. */ | |
8386 | set_current_sal_from_frame (get_current_frame ()); | |
8387 | } | |
dd7e2d2b PA |
8388 | |
8389 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8390 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8391 | if (stop_command != NULL) |
8392 | { | |
2d844eaf | 8393 | stop_context saved_context; |
4c2f2a79 | 8394 | |
a70b8144 | 8395 | try |
bf469271 PA |
8396 | { |
8397 | execute_cmd_pre_hook (stop_command); | |
8398 | } | |
230d2906 | 8399 | catch (const gdb_exception &ex) |
bf469271 PA |
8400 | { |
8401 | exception_fprintf (gdb_stderr, ex, | |
8402 | "Error while running hook_stop:\n"); | |
8403 | } | |
4c2f2a79 PA |
8404 | |
8405 | /* If the stop hook resumes the target, then there's no point in | |
8406 | trying to notify about the previous stop; its context is | |
8407 | gone. Likewise if the command switches thread or inferior -- | |
8408 | the observers would print a stop for the wrong | |
8409 | thread/inferior. */ | |
2d844eaf TT |
8410 | if (saved_context.changed ()) |
8411 | return 1; | |
4c2f2a79 | 8412 | } |
dd7e2d2b | 8413 | |
388a7084 PA |
8414 | /* Notify observers about the stop. This is where the interpreters |
8415 | print the stop event. */ | |
d7e15655 | 8416 | if (inferior_ptid != null_ptid) |
76727919 | 8417 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
388a7084 PA |
8418 | stop_print_frame); |
8419 | else | |
76727919 | 8420 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8421 | |
243a9253 PA |
8422 | annotate_stopped (); |
8423 | ||
48844aa6 PA |
8424 | if (target_has_execution) |
8425 | { | |
8426 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
fe726667 PA |
8427 | && last.kind != TARGET_WAITKIND_EXITED |
8428 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8429 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8430 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8431 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8432 | } |
6c95b8df PA |
8433 | |
8434 | /* Try to get rid of automatically added inferiors that are no | |
8435 | longer needed. Keeping those around slows down things linearly. | |
8436 | Note that this never removes the current inferior. */ | |
8437 | prune_inferiors (); | |
4c2f2a79 PA |
8438 | |
8439 | return 0; | |
c906108c | 8440 | } |
c906108c | 8441 | \f |
c5aa993b | 8442 | int |
96baa820 | 8443 | signal_stop_state (int signo) |
c906108c | 8444 | { |
d6b48e9c | 8445 | return signal_stop[signo]; |
c906108c SS |
8446 | } |
8447 | ||
c5aa993b | 8448 | int |
96baa820 | 8449 | signal_print_state (int signo) |
c906108c SS |
8450 | { |
8451 | return signal_print[signo]; | |
8452 | } | |
8453 | ||
c5aa993b | 8454 | int |
96baa820 | 8455 | signal_pass_state (int signo) |
c906108c SS |
8456 | { |
8457 | return signal_program[signo]; | |
8458 | } | |
8459 | ||
2455069d UW |
8460 | static void |
8461 | signal_cache_update (int signo) | |
8462 | { | |
8463 | if (signo == -1) | |
8464 | { | |
a493e3e2 | 8465 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8466 | signal_cache_update (signo); |
8467 | ||
8468 | return; | |
8469 | } | |
8470 | ||
8471 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8472 | && signal_print[signo] == 0 | |
ab04a2af TT |
8473 | && signal_program[signo] == 1 |
8474 | && signal_catch[signo] == 0); | |
2455069d UW |
8475 | } |
8476 | ||
488f131b | 8477 | int |
7bda5e4a | 8478 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8479 | { |
8480 | int ret = signal_stop[signo]; | |
abbb1732 | 8481 | |
d4f3574e | 8482 | signal_stop[signo] = state; |
2455069d | 8483 | signal_cache_update (signo); |
d4f3574e SS |
8484 | return ret; |
8485 | } | |
8486 | ||
488f131b | 8487 | int |
7bda5e4a | 8488 | signal_print_update (int signo, int state) |
d4f3574e SS |
8489 | { |
8490 | int ret = signal_print[signo]; | |
abbb1732 | 8491 | |
d4f3574e | 8492 | signal_print[signo] = state; |
2455069d | 8493 | signal_cache_update (signo); |
d4f3574e SS |
8494 | return ret; |
8495 | } | |
8496 | ||
488f131b | 8497 | int |
7bda5e4a | 8498 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8499 | { |
8500 | int ret = signal_program[signo]; | |
abbb1732 | 8501 | |
d4f3574e | 8502 | signal_program[signo] = state; |
2455069d | 8503 | signal_cache_update (signo); |
d4f3574e SS |
8504 | return ret; |
8505 | } | |
8506 | ||
ab04a2af TT |
8507 | /* Update the global 'signal_catch' from INFO and notify the |
8508 | target. */ | |
8509 | ||
8510 | void | |
8511 | signal_catch_update (const unsigned int *info) | |
8512 | { | |
8513 | int i; | |
8514 | ||
8515 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8516 | signal_catch[i] = info[i] > 0; | |
8517 | signal_cache_update (-1); | |
adc6a863 | 8518 | target_pass_signals (signal_pass); |
ab04a2af TT |
8519 | } |
8520 | ||
c906108c | 8521 | static void |
96baa820 | 8522 | sig_print_header (void) |
c906108c | 8523 | { |
3e43a32a MS |
8524 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8525 | "to program\tDescription\n")); | |
c906108c SS |
8526 | } |
8527 | ||
8528 | static void | |
2ea28649 | 8529 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8530 | { |
2ea28649 | 8531 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8532 | int name_padding = 13 - strlen (name); |
96baa820 | 8533 | |
c906108c SS |
8534 | if (name_padding <= 0) |
8535 | name_padding = 0; | |
8536 | ||
8537 | printf_filtered ("%s", name); | |
488f131b | 8538 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8539 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8540 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8541 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8542 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8543 | } |
8544 | ||
8545 | /* Specify how various signals in the inferior should be handled. */ | |
8546 | ||
8547 | static void | |
0b39b52e | 8548 | handle_command (const char *args, int from_tty) |
c906108c | 8549 | { |
c906108c | 8550 | int digits, wordlen; |
b926417a | 8551 | int sigfirst, siglast; |
2ea28649 | 8552 | enum gdb_signal oursig; |
c906108c | 8553 | int allsigs; |
c906108c SS |
8554 | |
8555 | if (args == NULL) | |
8556 | { | |
e2e0b3e5 | 8557 | error_no_arg (_("signal to handle")); |
c906108c SS |
8558 | } |
8559 | ||
1777feb0 | 8560 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8561 | |
adc6a863 PA |
8562 | const size_t nsigs = GDB_SIGNAL_LAST; |
8563 | unsigned char sigs[nsigs] {}; | |
c906108c | 8564 | |
1777feb0 | 8565 | /* Break the command line up into args. */ |
c906108c | 8566 | |
773a1edc | 8567 | gdb_argv built_argv (args); |
c906108c SS |
8568 | |
8569 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8570 | actions. Signal numbers and signal names may be interspersed with | |
8571 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8572 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8573 | |
773a1edc | 8574 | for (char *arg : built_argv) |
c906108c | 8575 | { |
773a1edc TT |
8576 | wordlen = strlen (arg); |
8577 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8578 | {; |
8579 | } | |
8580 | allsigs = 0; | |
8581 | sigfirst = siglast = -1; | |
8582 | ||
773a1edc | 8583 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8584 | { |
8585 | /* Apply action to all signals except those used by the | |
1777feb0 | 8586 | debugger. Silently skip those. */ |
c906108c SS |
8587 | allsigs = 1; |
8588 | sigfirst = 0; | |
8589 | siglast = nsigs - 1; | |
8590 | } | |
773a1edc | 8591 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8592 | { |
8593 | SET_SIGS (nsigs, sigs, signal_stop); | |
8594 | SET_SIGS (nsigs, sigs, signal_print); | |
8595 | } | |
773a1edc | 8596 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8597 | { |
8598 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8599 | } | |
773a1edc | 8600 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8601 | { |
8602 | SET_SIGS (nsigs, sigs, signal_print); | |
8603 | } | |
773a1edc | 8604 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8605 | { |
8606 | SET_SIGS (nsigs, sigs, signal_program); | |
8607 | } | |
773a1edc | 8608 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8609 | { |
8610 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8611 | } | |
773a1edc | 8612 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8613 | { |
8614 | SET_SIGS (nsigs, sigs, signal_program); | |
8615 | } | |
773a1edc | 8616 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8617 | { |
8618 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8619 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8620 | } | |
773a1edc | 8621 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8622 | { |
8623 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8624 | } | |
8625 | else if (digits > 0) | |
8626 | { | |
8627 | /* It is numeric. The numeric signal refers to our own | |
8628 | internal signal numbering from target.h, not to host/target | |
8629 | signal number. This is a feature; users really should be | |
8630 | using symbolic names anyway, and the common ones like | |
8631 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8632 | ||
8633 | sigfirst = siglast = (int) | |
773a1edc TT |
8634 | gdb_signal_from_command (atoi (arg)); |
8635 | if (arg[digits] == '-') | |
c906108c SS |
8636 | { |
8637 | siglast = (int) | |
773a1edc | 8638 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8639 | } |
8640 | if (sigfirst > siglast) | |
8641 | { | |
1777feb0 | 8642 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8643 | std::swap (sigfirst, siglast); |
c906108c SS |
8644 | } |
8645 | } | |
8646 | else | |
8647 | { | |
773a1edc | 8648 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8649 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8650 | { |
8651 | sigfirst = siglast = (int) oursig; | |
8652 | } | |
8653 | else | |
8654 | { | |
8655 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8656 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8657 | } |
8658 | } | |
8659 | ||
8660 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8661 | which signals to apply actions to. */ |
c906108c | 8662 | |
b926417a | 8663 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8664 | { |
2ea28649 | 8665 | switch ((enum gdb_signal) signum) |
c906108c | 8666 | { |
a493e3e2 PA |
8667 | case GDB_SIGNAL_TRAP: |
8668 | case GDB_SIGNAL_INT: | |
c906108c SS |
8669 | if (!allsigs && !sigs[signum]) |
8670 | { | |
9e2f0ad4 | 8671 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8672 | Are you sure you want to change it? "), |
2ea28649 | 8673 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8674 | { |
8675 | sigs[signum] = 1; | |
8676 | } | |
8677 | else | |
c119e040 | 8678 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8679 | } |
8680 | break; | |
a493e3e2 PA |
8681 | case GDB_SIGNAL_0: |
8682 | case GDB_SIGNAL_DEFAULT: | |
8683 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8684 | /* Make sure that "all" doesn't print these. */ |
8685 | break; | |
8686 | default: | |
8687 | sigs[signum] = 1; | |
8688 | break; | |
8689 | } | |
8690 | } | |
c906108c SS |
8691 | } |
8692 | ||
b926417a | 8693 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8694 | if (sigs[signum]) |
8695 | { | |
2455069d | 8696 | signal_cache_update (-1); |
adc6a863 PA |
8697 | target_pass_signals (signal_pass); |
8698 | target_program_signals (signal_program); | |
c906108c | 8699 | |
3a031f65 PA |
8700 | if (from_tty) |
8701 | { | |
8702 | /* Show the results. */ | |
8703 | sig_print_header (); | |
8704 | for (; signum < nsigs; signum++) | |
8705 | if (sigs[signum]) | |
aead7601 | 8706 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8707 | } |
8708 | ||
8709 | break; | |
8710 | } | |
c906108c SS |
8711 | } |
8712 | ||
de0bea00 MF |
8713 | /* Complete the "handle" command. */ |
8714 | ||
eb3ff9a5 | 8715 | static void |
de0bea00 | 8716 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8717 | completion_tracker &tracker, |
6f937416 | 8718 | const char *text, const char *word) |
de0bea00 | 8719 | { |
de0bea00 MF |
8720 | static const char * const keywords[] = |
8721 | { | |
8722 | "all", | |
8723 | "stop", | |
8724 | "ignore", | |
8725 | "print", | |
8726 | "pass", | |
8727 | "nostop", | |
8728 | "noignore", | |
8729 | "noprint", | |
8730 | "nopass", | |
8731 | NULL, | |
8732 | }; | |
8733 | ||
eb3ff9a5 PA |
8734 | signal_completer (ignore, tracker, text, word); |
8735 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8736 | } |
8737 | ||
2ea28649 PA |
8738 | enum gdb_signal |
8739 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8740 | { |
8741 | if (num >= 1 && num <= 15) | |
2ea28649 | 8742 | return (enum gdb_signal) num; |
ed01b82c PA |
8743 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8744 | Use \"info signals\" for a list of symbolic signals.")); | |
8745 | } | |
8746 | ||
c906108c SS |
8747 | /* Print current contents of the tables set by the handle command. |
8748 | It is possible we should just be printing signals actually used | |
8749 | by the current target (but for things to work right when switching | |
8750 | targets, all signals should be in the signal tables). */ | |
8751 | ||
8752 | static void | |
1d12d88f | 8753 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8754 | { |
2ea28649 | 8755 | enum gdb_signal oursig; |
abbb1732 | 8756 | |
c906108c SS |
8757 | sig_print_header (); |
8758 | ||
8759 | if (signum_exp) | |
8760 | { | |
8761 | /* First see if this is a symbol name. */ | |
2ea28649 | 8762 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8763 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8764 | { |
8765 | /* No, try numeric. */ | |
8766 | oursig = | |
2ea28649 | 8767 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8768 | } |
8769 | sig_print_info (oursig); | |
8770 | return; | |
8771 | } | |
8772 | ||
8773 | printf_filtered ("\n"); | |
8774 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8775 | for (oursig = GDB_SIGNAL_FIRST; |
8776 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8777 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8778 | { |
8779 | QUIT; | |
8780 | ||
a493e3e2 PA |
8781 | if (oursig != GDB_SIGNAL_UNKNOWN |
8782 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8783 | sig_print_info (oursig); |
8784 | } | |
8785 | ||
3e43a32a MS |
8786 | printf_filtered (_("\nUse the \"handle\" command " |
8787 | "to change these tables.\n")); | |
c906108c | 8788 | } |
4aa995e1 PA |
8789 | |
8790 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8791 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8792 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8793 | also dependent on which thread you have selected. |
8794 | ||
8795 | 1. making $_siginfo be an internalvar that creates a new value on | |
8796 | access. | |
8797 | ||
8798 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8799 | ||
8800 | /* This function implements the lval_computed support for reading a | |
8801 | $_siginfo value. */ | |
8802 | ||
8803 | static void | |
8804 | siginfo_value_read (struct value *v) | |
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 | |
4aa995e1 | 8812 | transferred = |
8b88a78e | 8813 | target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, |
4aa995e1 PA |
8814 | NULL, |
8815 | value_contents_all_raw (v), | |
8816 | value_offset (v), | |
8817 | TYPE_LENGTH (value_type (v))); | |
8818 | ||
8819 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8820 | error (_("Unable to read siginfo")); | |
8821 | } | |
8822 | ||
8823 | /* This function implements the lval_computed support for writing a | |
8824 | $_siginfo value. */ | |
8825 | ||
8826 | static void | |
8827 | siginfo_value_write (struct value *v, struct value *fromval) | |
8828 | { | |
8829 | LONGEST transferred; | |
8830 | ||
a911d87a PA |
8831 | /* If we can access registers, so can we access $_siginfo. Likewise |
8832 | vice versa. */ | |
8833 | validate_registers_access (); | |
c709acd1 | 8834 | |
8b88a78e | 8835 | transferred = target_write (current_top_target (), |
4aa995e1 PA |
8836 | TARGET_OBJECT_SIGNAL_INFO, |
8837 | NULL, | |
8838 | value_contents_all_raw (fromval), | |
8839 | value_offset (v), | |
8840 | TYPE_LENGTH (value_type (fromval))); | |
8841 | ||
8842 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8843 | error (_("Unable to write siginfo")); | |
8844 | } | |
8845 | ||
c8f2448a | 8846 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8847 | { |
8848 | siginfo_value_read, | |
8849 | siginfo_value_write | |
8850 | }; | |
8851 | ||
8852 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8853 | the current thread using architecture GDBARCH. Return a void value |
8854 | if there's no object available. */ | |
4aa995e1 | 8855 | |
2c0b251b | 8856 | static struct value * |
22d2b532 SDJ |
8857 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8858 | void *ignore) | |
4aa995e1 | 8859 | { |
4aa995e1 | 8860 | if (target_has_stack |
d7e15655 | 8861 | && inferior_ptid != null_ptid |
78267919 | 8862 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 8863 | { |
78267919 | 8864 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8865 | |
78267919 | 8866 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8867 | } |
8868 | ||
78267919 | 8869 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8870 | } |
8871 | ||
c906108c | 8872 | \f |
16c381f0 JK |
8873 | /* infcall_suspend_state contains state about the program itself like its |
8874 | registers and any signal it received when it last stopped. | |
8875 | This state must be restored regardless of how the inferior function call | |
8876 | ends (either successfully, or after it hits a breakpoint or signal) | |
8877 | if the program is to properly continue where it left off. */ | |
8878 | ||
6bf78e29 | 8879 | class infcall_suspend_state |
7a292a7a | 8880 | { |
6bf78e29 AB |
8881 | public: |
8882 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
8883 | once the inferior function call has finished. */ | |
8884 | infcall_suspend_state (struct gdbarch *gdbarch, | |
8885 | const struct thread_info *tp, | |
8886 | struct regcache *regcache) | |
8887 | : m_thread_suspend (tp->suspend), | |
8888 | m_registers (new readonly_detached_regcache (*regcache)) | |
8889 | { | |
8890 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
8891 | ||
8892 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8893 | { | |
8894 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8895 | size_t len = TYPE_LENGTH (type); | |
8896 | ||
8897 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); | |
8898 | ||
8899 | if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8900 | siginfo_data.get (), 0, len) != len) | |
8901 | { | |
8902 | /* Errors ignored. */ | |
8903 | siginfo_data.reset (nullptr); | |
8904 | } | |
8905 | } | |
8906 | ||
8907 | if (siginfo_data) | |
8908 | { | |
8909 | m_siginfo_gdbarch = gdbarch; | |
8910 | m_siginfo_data = std::move (siginfo_data); | |
8911 | } | |
8912 | } | |
8913 | ||
8914 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 8915 | |
6bf78e29 AB |
8916 | readonly_detached_regcache *registers () const |
8917 | { | |
8918 | return m_registers.get (); | |
8919 | } | |
8920 | ||
8921 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
8922 | ||
8923 | void restore (struct gdbarch *gdbarch, | |
8924 | struct thread_info *tp, | |
8925 | struct regcache *regcache) const | |
8926 | { | |
8927 | tp->suspend = m_thread_suspend; | |
8928 | ||
8929 | if (m_siginfo_gdbarch == gdbarch) | |
8930 | { | |
8931 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8932 | ||
8933 | /* Errors ignored. */ | |
8934 | target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8935 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); | |
8936 | } | |
8937 | ||
8938 | /* The inferior can be gone if the user types "print exit(0)" | |
8939 | (and perhaps other times). */ | |
8940 | if (target_has_execution) | |
8941 | /* NB: The register write goes through to the target. */ | |
8942 | regcache->restore (registers ()); | |
8943 | } | |
8944 | ||
8945 | private: | |
8946 | /* How the current thread stopped before the inferior function call was | |
8947 | executed. */ | |
8948 | struct thread_suspend_state m_thread_suspend; | |
8949 | ||
8950 | /* The registers before the inferior function call was executed. */ | |
8951 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 8952 | |
35515841 | 8953 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 8954 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
8955 | |
8956 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8957 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8958 | content would be invalid. */ | |
6bf78e29 | 8959 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
8960 | }; |
8961 | ||
cb524840 TT |
8962 | infcall_suspend_state_up |
8963 | save_infcall_suspend_state () | |
b89667eb | 8964 | { |
b89667eb | 8965 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 8966 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8967 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 8968 | |
6bf78e29 AB |
8969 | infcall_suspend_state_up inf_state |
8970 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 8971 | |
6bf78e29 AB |
8972 | /* Having saved the current state, adjust the thread state, discarding |
8973 | any stop signal information. The stop signal is not useful when | |
8974 | starting an inferior function call, and run_inferior_call will not use | |
8975 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 8976 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 8977 | |
b89667eb DE |
8978 | return inf_state; |
8979 | } | |
8980 | ||
8981 | /* Restore inferior session state to INF_STATE. */ | |
8982 | ||
8983 | void | |
16c381f0 | 8984 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8985 | { |
8986 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 8987 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8988 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 8989 | |
6bf78e29 | 8990 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 8991 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8992 | } |
8993 | ||
b89667eb | 8994 | void |
16c381f0 | 8995 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 8996 | { |
dd848631 | 8997 | delete inf_state; |
b89667eb DE |
8998 | } |
8999 | ||
daf6667d | 9000 | readonly_detached_regcache * |
16c381f0 | 9001 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 9002 | { |
6bf78e29 | 9003 | return inf_state->registers (); |
b89667eb DE |
9004 | } |
9005 | ||
16c381f0 JK |
9006 | /* infcall_control_state contains state regarding gdb's control of the |
9007 | inferior itself like stepping control. It also contains session state like | |
9008 | the user's currently selected frame. */ | |
b89667eb | 9009 | |
16c381f0 | 9010 | struct infcall_control_state |
b89667eb | 9011 | { |
16c381f0 JK |
9012 | struct thread_control_state thread_control; |
9013 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
9014 | |
9015 | /* Other fields: */ | |
ee841dd8 TT |
9016 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
9017 | int stopped_by_random_signal = 0; | |
7a292a7a | 9018 | |
b89667eb | 9019 | /* ID if the selected frame when the inferior function call was made. */ |
ee841dd8 | 9020 | struct frame_id selected_frame_id {}; |
7a292a7a SS |
9021 | }; |
9022 | ||
c906108c | 9023 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9024 | connection. */ |
c906108c | 9025 | |
cb524840 TT |
9026 | infcall_control_state_up |
9027 | save_infcall_control_state () | |
c906108c | 9028 | { |
cb524840 | 9029 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9030 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9031 | struct inferior *inf = current_inferior (); |
7a292a7a | 9032 | |
16c381f0 JK |
9033 | inf_status->thread_control = tp->control; |
9034 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9035 | |
8358c15c | 9036 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9037 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9038 | |
16c381f0 JK |
9039 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9040 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9041 | hand them back the original chain when restore_infcall_control_state is | |
9042 | called. */ | |
9043 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9044 | |
9045 | /* Other fields: */ | |
9046 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9047 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9048 | |
206415a3 | 9049 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 9050 | |
7a292a7a | 9051 | return inf_status; |
c906108c SS |
9052 | } |
9053 | ||
bf469271 PA |
9054 | static void |
9055 | restore_selected_frame (const frame_id &fid) | |
c906108c | 9056 | { |
bf469271 | 9057 | frame_info *frame = frame_find_by_id (fid); |
c906108c | 9058 | |
aa0cd9c1 AC |
9059 | /* If inf_status->selected_frame_id is NULL, there was no previously |
9060 | selected frame. */ | |
101dcfbe | 9061 | if (frame == NULL) |
c906108c | 9062 | { |
8a3fe4f8 | 9063 | warning (_("Unable to restore previously selected frame.")); |
bf469271 | 9064 | return; |
c906108c SS |
9065 | } |
9066 | ||
0f7d239c | 9067 | select_frame (frame); |
c906108c SS |
9068 | } |
9069 | ||
b89667eb DE |
9070 | /* Restore inferior session state to INF_STATUS. */ |
9071 | ||
c906108c | 9072 | void |
16c381f0 | 9073 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9074 | { |
4e1c45ea | 9075 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9076 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9077 | |
8358c15c JK |
9078 | if (tp->control.step_resume_breakpoint) |
9079 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9080 | ||
5b79abe7 TT |
9081 | if (tp->control.exception_resume_breakpoint) |
9082 | tp->control.exception_resume_breakpoint->disposition | |
9083 | = disp_del_at_next_stop; | |
9084 | ||
d82142e2 | 9085 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9086 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9087 | |
16c381f0 JK |
9088 | tp->control = inf_status->thread_control; |
9089 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9090 | |
9091 | /* Other fields: */ | |
9092 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9093 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9094 | |
b89667eb | 9095 | if (target_has_stack) |
c906108c | 9096 | { |
bf469271 | 9097 | /* The point of the try/catch is that if the stack is clobbered, |
101dcfbe AC |
9098 | walking the stack might encounter a garbage pointer and |
9099 | error() trying to dereference it. */ | |
a70b8144 | 9100 | try |
bf469271 PA |
9101 | { |
9102 | restore_selected_frame (inf_status->selected_frame_id); | |
9103 | } | |
230d2906 | 9104 | catch (const gdb_exception_error &ex) |
bf469271 PA |
9105 | { |
9106 | exception_fprintf (gdb_stderr, ex, | |
9107 | "Unable to restore previously selected frame:\n"); | |
9108 | /* Error in restoring the selected frame. Select the | |
9109 | innermost frame. */ | |
9110 | select_frame (get_current_frame ()); | |
9111 | } | |
c906108c | 9112 | } |
c906108c | 9113 | |
ee841dd8 | 9114 | delete inf_status; |
7a292a7a | 9115 | } |
c906108c SS |
9116 | |
9117 | void | |
16c381f0 | 9118 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9119 | { |
8358c15c JK |
9120 | if (inf_status->thread_control.step_resume_breakpoint) |
9121 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9122 | = disp_del_at_next_stop; | |
9123 | ||
5b79abe7 TT |
9124 | if (inf_status->thread_control.exception_resume_breakpoint) |
9125 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9126 | = disp_del_at_next_stop; | |
9127 | ||
1777feb0 | 9128 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9129 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9130 | |
ee841dd8 | 9131 | delete inf_status; |
7a292a7a | 9132 | } |
b89667eb | 9133 | \f |
7f89fd65 | 9134 | /* See infrun.h. */ |
0c557179 SDJ |
9135 | |
9136 | void | |
9137 | clear_exit_convenience_vars (void) | |
9138 | { | |
9139 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9140 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9141 | } | |
c5aa993b | 9142 | \f |
488f131b | 9143 | |
b2175913 MS |
9144 | /* User interface for reverse debugging: |
9145 | Set exec-direction / show exec-direction commands | |
9146 | (returns error unless target implements to_set_exec_direction method). */ | |
9147 | ||
170742de | 9148 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9149 | static const char exec_forward[] = "forward"; |
9150 | static const char exec_reverse[] = "reverse"; | |
9151 | static const char *exec_direction = exec_forward; | |
40478521 | 9152 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9153 | exec_forward, |
9154 | exec_reverse, | |
9155 | NULL | |
9156 | }; | |
9157 | ||
9158 | static void | |
eb4c3f4a | 9159 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9160 | struct cmd_list_element *cmd) |
9161 | { | |
9162 | if (target_can_execute_reverse) | |
9163 | { | |
9164 | if (!strcmp (exec_direction, exec_forward)) | |
9165 | execution_direction = EXEC_FORWARD; | |
9166 | else if (!strcmp (exec_direction, exec_reverse)) | |
9167 | execution_direction = EXEC_REVERSE; | |
9168 | } | |
8bbed405 MS |
9169 | else |
9170 | { | |
9171 | exec_direction = exec_forward; | |
9172 | error (_("Target does not support this operation.")); | |
9173 | } | |
b2175913 MS |
9174 | } |
9175 | ||
9176 | static void | |
9177 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9178 | struct cmd_list_element *cmd, const char *value) | |
9179 | { | |
9180 | switch (execution_direction) { | |
9181 | case EXEC_FORWARD: | |
9182 | fprintf_filtered (out, _("Forward.\n")); | |
9183 | break; | |
9184 | case EXEC_REVERSE: | |
9185 | fprintf_filtered (out, _("Reverse.\n")); | |
9186 | break; | |
b2175913 | 9187 | default: |
d8b34453 PA |
9188 | internal_error (__FILE__, __LINE__, |
9189 | _("bogus execution_direction value: %d"), | |
9190 | (int) execution_direction); | |
b2175913 MS |
9191 | } |
9192 | } | |
9193 | ||
d4db2f36 PA |
9194 | static void |
9195 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9196 | struct cmd_list_element *c, const char *value) | |
9197 | { | |
3e43a32a MS |
9198 | fprintf_filtered (file, _("Resuming the execution of threads " |
9199 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9200 | } |
ad52ddc6 | 9201 | |
22d2b532 SDJ |
9202 | /* Implementation of `siginfo' variable. */ |
9203 | ||
9204 | static const struct internalvar_funcs siginfo_funcs = | |
9205 | { | |
9206 | siginfo_make_value, | |
9207 | NULL, | |
9208 | NULL | |
9209 | }; | |
9210 | ||
372316f1 PA |
9211 | /* Callback for infrun's target events source. This is marked when a |
9212 | thread has a pending status to process. */ | |
9213 | ||
9214 | static void | |
9215 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9216 | { | |
b1a35af2 | 9217 | inferior_event_handler (INF_REG_EVENT); |
372316f1 PA |
9218 | } |
9219 | ||
6c265988 | 9220 | void _initialize_infrun (); |
c906108c | 9221 | void |
6c265988 | 9222 | _initialize_infrun () |
c906108c | 9223 | { |
de0bea00 | 9224 | struct cmd_list_element *c; |
c906108c | 9225 | |
372316f1 PA |
9226 | /* Register extra event sources in the event loop. */ |
9227 | infrun_async_inferior_event_token | |
9228 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
9229 | ||
11db9430 | 9230 | add_info ("signals", info_signals_command, _("\ |
1bedd215 AC |
9231 | What debugger does when program gets various signals.\n\ |
9232 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9233 | add_info_alias ("handle", "signals", 0); |
9234 | ||
de0bea00 | 9235 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9236 | Specify how to handle signals.\n\ |
486c7739 | 9237 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9238 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9239 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9240 | will be displayed instead.\n\ |
9241 | \n\ | |
c906108c SS |
9242 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9243 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9244 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9245 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9246 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9247 | \n\ |
1bedd215 | 9248 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9249 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9250 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9251 | Print means print a message if this signal happens.\n\ | |
9252 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9253 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9254 | Pass and Stop may be combined.\n\ |
9255 | \n\ | |
9256 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9257 | may be interspersed with actions, with the actions being performed for\n\ | |
9258 | all signals cumulatively specified.")); | |
de0bea00 | 9259 | set_cmd_completer (c, handle_completer); |
486c7739 | 9260 | |
c906108c | 9261 | if (!dbx_commands) |
1a966eab AC |
9262 | stop_command = add_cmd ("stop", class_obscure, |
9263 | not_just_help_class_command, _("\ | |
9264 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9265 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9266 | of the program stops."), &cmdlist); |
c906108c | 9267 | |
ccce17b0 | 9268 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9269 | Set inferior debugging."), _("\ |
9270 | Show inferior debugging."), _("\ | |
9271 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9272 | NULL, |
9273 | show_debug_infrun, | |
9274 | &setdebuglist, &showdebuglist); | |
527159b7 | 9275 | |
3e43a32a MS |
9276 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9277 | &debug_displaced, _("\ | |
237fc4c9 PA |
9278 | Set displaced stepping debugging."), _("\ |
9279 | Show displaced stepping debugging."), _("\ | |
9280 | When non-zero, displaced stepping specific debugging is enabled."), | |
9281 | NULL, | |
9282 | show_debug_displaced, | |
9283 | &setdebuglist, &showdebuglist); | |
9284 | ||
ad52ddc6 PA |
9285 | add_setshow_boolean_cmd ("non-stop", no_class, |
9286 | &non_stop_1, _("\ | |
9287 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9288 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9289 | When debugging a multi-threaded program and this setting is\n\ | |
9290 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9291 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9292 | all other threads in the program while you interact with the thread of\n\ | |
9293 | interest. When you continue or step a thread, you can allow the other\n\ | |
9294 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9295 | thread's state, all threads stop.\n\ | |
9296 | \n\ | |
9297 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9298 | to run freely. You'll be able to step each thread independently,\n\ | |
9299 | leave it stopped or free to run as needed."), | |
9300 | set_non_stop, | |
9301 | show_non_stop, | |
9302 | &setlist, | |
9303 | &showlist); | |
9304 | ||
adc6a863 | 9305 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9306 | { |
9307 | signal_stop[i] = 1; | |
9308 | signal_print[i] = 1; | |
9309 | signal_program[i] = 1; | |
ab04a2af | 9310 | signal_catch[i] = 0; |
c906108c SS |
9311 | } |
9312 | ||
4d9d9d04 PA |
9313 | /* Signals caused by debugger's own actions should not be given to |
9314 | the program afterwards. | |
9315 | ||
9316 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9317 | explicitly specifies that it should be delivered to the target | |
9318 | program. Typically, that would occur when a user is debugging a | |
9319 | target monitor on a simulator: the target monitor sets a | |
9320 | breakpoint; the simulator encounters this breakpoint and halts | |
9321 | the simulation handing control to GDB; GDB, noting that the stop | |
9322 | address doesn't map to any known breakpoint, returns control back | |
9323 | to the simulator; the simulator then delivers the hardware | |
9324 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9325 | debugged. */ | |
a493e3e2 PA |
9326 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9327 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9328 | |
9329 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9330 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9331 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9332 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9333 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9334 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9335 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9336 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9337 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9338 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9339 | signal_print[GDB_SIGNAL_IO] = 0; | |
9340 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9341 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9342 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9343 | signal_print[GDB_SIGNAL_URG] = 0; | |
9344 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9345 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9346 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9347 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9348 | |
cd0fc7c3 SS |
9349 | /* These signals are used internally by user-level thread |
9350 | implementations. (See signal(5) on Solaris.) Like the above | |
9351 | signals, a healthy program receives and handles them as part of | |
9352 | its normal operation. */ | |
a493e3e2 PA |
9353 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9354 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9355 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9356 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9357 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9358 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9359 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9360 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9361 | |
2455069d UW |
9362 | /* Update cached state. */ |
9363 | signal_cache_update (-1); | |
9364 | ||
85c07804 AC |
9365 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9366 | &stop_on_solib_events, _("\ | |
9367 | Set stopping for shared library events."), _("\ | |
9368 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9369 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9370 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9371 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9372 | set_stop_on_solib_events, |
920d2a44 | 9373 | show_stop_on_solib_events, |
85c07804 | 9374 | &setlist, &showlist); |
c906108c | 9375 | |
7ab04401 AC |
9376 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9377 | follow_fork_mode_kind_names, | |
9378 | &follow_fork_mode_string, _("\ | |
9379 | Set debugger response to a program call of fork or vfork."), _("\ | |
9380 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9381 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9382 | parent - the original process is debugged after a fork\n\ | |
9383 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9384 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9385 | By default, the debugger will follow the parent process."), |
9386 | NULL, | |
920d2a44 | 9387 | show_follow_fork_mode_string, |
7ab04401 AC |
9388 | &setlist, &showlist); |
9389 | ||
6c95b8df PA |
9390 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9391 | follow_exec_mode_names, | |
9392 | &follow_exec_mode_string, _("\ | |
9393 | Set debugger response to a program call of exec."), _("\ | |
9394 | Show debugger response to a program call of exec."), _("\ | |
9395 | An exec call replaces the program image of a process.\n\ | |
9396 | \n\ | |
9397 | follow-exec-mode can be:\n\ | |
9398 | \n\ | |
cce7e648 | 9399 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9400 | to this new inferior. The program the process was running before\n\ |
9401 | the exec call can be restarted afterwards by restarting the original\n\ | |
9402 | inferior.\n\ | |
9403 | \n\ | |
9404 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9405 | The new executable image replaces the previous executable loaded in\n\ | |
9406 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9407 | the executable the process was running after the exec call.\n\ | |
9408 | \n\ | |
9409 | By default, the debugger will use the same inferior."), | |
9410 | NULL, | |
9411 | show_follow_exec_mode_string, | |
9412 | &setlist, &showlist); | |
9413 | ||
7ab04401 AC |
9414 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9415 | scheduler_enums, &scheduler_mode, _("\ | |
9416 | Set mode for locking scheduler during execution."), _("\ | |
9417 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9418 | off == no locking (threads may preempt at any time)\n\ |
9419 | on == full locking (no thread except the current thread may run)\n\ | |
9420 | This applies to both normal execution and replay mode.\n\ | |
9421 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9422 | In this mode, other threads may run during other commands.\n\ | |
9423 | This applies to both normal execution and replay mode.\n\ | |
9424 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9425 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9426 | show_scheduler_mode, |
7ab04401 | 9427 | &setlist, &showlist); |
5fbbeb29 | 9428 | |
d4db2f36 PA |
9429 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9430 | Set mode for resuming threads of all processes."), _("\ | |
9431 | Show mode for resuming threads of all processes."), _("\ | |
9432 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9433 | threads of all processes. When off (which is the default), execution\n\ | |
9434 | commands only resume the threads of the current process. The set of\n\ | |
9435 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9436 | mode (see help set scheduler-locking)."), | |
9437 | NULL, | |
9438 | show_schedule_multiple, | |
9439 | &setlist, &showlist); | |
9440 | ||
5bf193a2 AC |
9441 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9442 | Set mode of the step operation."), _("\ | |
9443 | Show mode of the step operation."), _("\ | |
9444 | When set, doing a step over a function without debug line information\n\ | |
9445 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9446 | function is skipped and the step command stops at a different source line."), | |
9447 | NULL, | |
920d2a44 | 9448 | show_step_stop_if_no_debug, |
5bf193a2 | 9449 | &setlist, &showlist); |
ca6724c1 | 9450 | |
72d0e2c5 YQ |
9451 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9452 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9453 | Set debugger's willingness to use displaced stepping."), _("\ |
9454 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9455 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9456 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9457 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9458 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9459 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9460 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9461 | NULL, |
9462 | show_can_use_displaced_stepping, | |
9463 | &setlist, &showlist); | |
237fc4c9 | 9464 | |
b2175913 MS |
9465 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9466 | &exec_direction, _("Set direction of execution.\n\ | |
9467 | Options are 'forward' or 'reverse'."), | |
9468 | _("Show direction of execution (forward/reverse)."), | |
9469 | _("Tells gdb whether to execute forward or backward."), | |
9470 | set_exec_direction_func, show_exec_direction_func, | |
9471 | &setlist, &showlist); | |
9472 | ||
6c95b8df PA |
9473 | /* Set/show detach-on-fork: user-settable mode. */ |
9474 | ||
9475 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9476 | Set whether gdb will detach the child of a fork."), _("\ | |
9477 | Show whether gdb will detach the child of a fork."), _("\ | |
9478 | Tells gdb whether to detach the child of a fork."), | |
9479 | NULL, NULL, &setlist, &showlist); | |
9480 | ||
03583c20 UW |
9481 | /* Set/show disable address space randomization mode. */ |
9482 | ||
9483 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9484 | &disable_randomization, _("\ | |
9485 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9486 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9487 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9488 | address space is disabled. Standalone programs run with the randomization\n\ | |
9489 | enabled by default on some platforms."), | |
9490 | &set_disable_randomization, | |
9491 | &show_disable_randomization, | |
9492 | &setlist, &showlist); | |
9493 | ||
ca6724c1 | 9494 | /* ptid initializations */ |
ca6724c1 KB |
9495 | inferior_ptid = null_ptid; |
9496 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9497 | |
76727919 TT |
9498 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed); |
9499 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested); | |
9500 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit); | |
9501 | gdb::observers::inferior_exit.attach (infrun_inferior_exit); | |
4aa995e1 PA |
9502 | |
9503 | /* Explicitly create without lookup, since that tries to create a | |
9504 | value with a void typed value, and when we get here, gdbarch | |
9505 | isn't initialized yet. At this point, we're quite sure there | |
9506 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9507 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9508 | |
9509 | add_setshow_boolean_cmd ("observer", no_class, | |
9510 | &observer_mode_1, _("\ | |
9511 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9512 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9513 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9514 | affect its execution. Registers and memory may not be changed,\n\ | |
9515 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9516 | or signalled."), | |
9517 | set_observer_mode, | |
9518 | show_observer_mode, | |
9519 | &setlist, | |
9520 | &showlist); | |
c906108c | 9521 | } |