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 | ||
0dda35b4 SM |
1255 | gdb::observers::inferior_execd.notify (inf); |
1256 | ||
c906108c SS |
1257 | /* The next resume of this inferior should bring it to the shlib |
1258 | startup breakpoints. (If the user had also set bp's on | |
1259 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1260 | matically get reset there in the new process.). */ |
c906108c SS |
1261 | } |
1262 | ||
c2829269 PA |
1263 | /* The queue of threads that need to do a step-over operation to get |
1264 | past e.g., a breakpoint. What technique is used to step over the | |
1265 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1266 | same queue, to maintain rough temporal order of execution, in order | |
1267 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1268 | constantly stepping the same couple threads past their breakpoints | |
1269 | over and over, if the single-step finish fast enough. */ | |
7bd43605 | 1270 | struct thread_info *global_thread_step_over_chain_head; |
c2829269 | 1271 | |
6c4cfb24 PA |
1272 | /* Bit flags indicating what the thread needs to step over. */ |
1273 | ||
8d297bbf | 1274 | enum step_over_what_flag |
6c4cfb24 PA |
1275 | { |
1276 | /* Step over a breakpoint. */ | |
1277 | STEP_OVER_BREAKPOINT = 1, | |
1278 | ||
1279 | /* Step past a non-continuable watchpoint, in order to let the | |
1280 | instruction execute so we can evaluate the watchpoint | |
1281 | expression. */ | |
1282 | STEP_OVER_WATCHPOINT = 2 | |
1283 | }; | |
8d297bbf | 1284 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1285 | |
963f9c80 | 1286 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1287 | |
1288 | struct step_over_info | |
1289 | { | |
963f9c80 PA |
1290 | /* If we're stepping past a breakpoint, this is the address space |
1291 | and address of the instruction the breakpoint is set at. We'll | |
1292 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1293 | non-NULL. */ | |
8b86c959 | 1294 | const address_space *aspace; |
31e77af2 | 1295 | CORE_ADDR address; |
963f9c80 PA |
1296 | |
1297 | /* The instruction being stepped over triggers a nonsteppable | |
1298 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1299 | int nonsteppable_watchpoint_p; | |
21edc42f YQ |
1300 | |
1301 | /* The thread's global number. */ | |
1302 | int thread; | |
31e77af2 PA |
1303 | }; |
1304 | ||
1305 | /* The step-over info of the location that is being stepped over. | |
1306 | ||
1307 | Note that with async/breakpoint always-inserted mode, a user might | |
1308 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1309 | being stepped over. As setting a new breakpoint inserts all | |
1310 | breakpoints, we need to make sure the breakpoint being stepped over | |
1311 | isn't inserted then. We do that by only clearing the step-over | |
1312 | info when the step-over is actually finished (or aborted). | |
1313 | ||
1314 | Presently GDB can only step over one breakpoint at any given time. | |
1315 | Given threads that can't run code in the same address space as the | |
1316 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1317 | to step-over at most one breakpoint per address space (so this info | |
1318 | could move to the address space object if/when GDB is extended). | |
1319 | The set of breakpoints being stepped over will normally be much | |
1320 | smaller than the set of all breakpoints, so a flag in the | |
1321 | breakpoint location structure would be wasteful. A separate list | |
1322 | also saves complexity and run-time, as otherwise we'd have to go | |
1323 | through all breakpoint locations clearing their flag whenever we | |
1324 | start a new sequence. Similar considerations weigh against storing | |
1325 | this info in the thread object. Plus, not all step overs actually | |
1326 | have breakpoint locations -- e.g., stepping past a single-step | |
1327 | breakpoint, or stepping to complete a non-continuable | |
1328 | watchpoint. */ | |
1329 | static struct step_over_info step_over_info; | |
1330 | ||
1331 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1332 | stepping over. |
1333 | N.B. We record the aspace and address now, instead of say just the thread, | |
1334 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1335 | |
1336 | static void | |
8b86c959 | 1337 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1338 | int nonsteppable_watchpoint_p, |
1339 | int thread) | |
31e77af2 PA |
1340 | { |
1341 | step_over_info.aspace = aspace; | |
1342 | step_over_info.address = address; | |
963f9c80 | 1343 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1344 | step_over_info.thread = thread; |
31e77af2 PA |
1345 | } |
1346 | ||
1347 | /* Called when we're not longer stepping over a breakpoint / an | |
1348 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1349 | ||
1350 | static void | |
1351 | clear_step_over_info (void) | |
1352 | { | |
edbcda09 | 1353 | infrun_log_debug ("clearing step over info"); |
31e77af2 PA |
1354 | step_over_info.aspace = NULL; |
1355 | step_over_info.address = 0; | |
963f9c80 | 1356 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1357 | step_over_info.thread = -1; |
31e77af2 PA |
1358 | } |
1359 | ||
7f89fd65 | 1360 | /* See infrun.h. */ |
31e77af2 PA |
1361 | |
1362 | int | |
1363 | stepping_past_instruction_at (struct address_space *aspace, | |
1364 | CORE_ADDR address) | |
1365 | { | |
1366 | return (step_over_info.aspace != NULL | |
1367 | && breakpoint_address_match (aspace, address, | |
1368 | step_over_info.aspace, | |
1369 | step_over_info.address)); | |
1370 | } | |
1371 | ||
963f9c80 PA |
1372 | /* See infrun.h. */ |
1373 | ||
21edc42f YQ |
1374 | int |
1375 | thread_is_stepping_over_breakpoint (int thread) | |
1376 | { | |
1377 | return (step_over_info.thread != -1 | |
1378 | && thread == step_over_info.thread); | |
1379 | } | |
1380 | ||
1381 | /* See infrun.h. */ | |
1382 | ||
963f9c80 PA |
1383 | int |
1384 | stepping_past_nonsteppable_watchpoint (void) | |
1385 | { | |
1386 | return step_over_info.nonsteppable_watchpoint_p; | |
1387 | } | |
1388 | ||
6cc83d2a PA |
1389 | /* Returns true if step-over info is valid. */ |
1390 | ||
1391 | static int | |
1392 | step_over_info_valid_p (void) | |
1393 | { | |
963f9c80 PA |
1394 | return (step_over_info.aspace != NULL |
1395 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1396 | } |
1397 | ||
c906108c | 1398 | \f |
237fc4c9 PA |
1399 | /* Displaced stepping. */ |
1400 | ||
1401 | /* In non-stop debugging mode, we must take special care to manage | |
1402 | breakpoints properly; in particular, the traditional strategy for | |
1403 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1404 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1405 | breakpoint it has hit while ensuring that other threads running | |
1406 | concurrently will hit the breakpoint as they should. | |
1407 | ||
1408 | The traditional way to step a thread T off a breakpoint in a | |
1409 | multi-threaded program in all-stop mode is as follows: | |
1410 | ||
1411 | a0) Initially, all threads are stopped, and breakpoints are not | |
1412 | inserted. | |
1413 | a1) We single-step T, leaving breakpoints uninserted. | |
1414 | a2) We insert breakpoints, and resume all threads. | |
1415 | ||
1416 | In non-stop debugging, however, this strategy is unsuitable: we | |
1417 | don't want to have to stop all threads in the system in order to | |
1418 | continue or step T past a breakpoint. Instead, we use displaced | |
1419 | stepping: | |
1420 | ||
1421 | n0) Initially, T is stopped, other threads are running, and | |
1422 | breakpoints are inserted. | |
1423 | n1) We copy the instruction "under" the breakpoint to a separate | |
1424 | location, outside the main code stream, making any adjustments | |
1425 | to the instruction, register, and memory state as directed by | |
1426 | T's architecture. | |
1427 | n2) We single-step T over the instruction at its new location. | |
1428 | n3) We adjust the resulting register and memory state as directed | |
1429 | by T's architecture. This includes resetting T's PC to point | |
1430 | back into the main instruction stream. | |
1431 | n4) We resume T. | |
1432 | ||
1433 | This approach depends on the following gdbarch methods: | |
1434 | ||
1435 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1436 | indicate where to copy the instruction, and how much space must | |
1437 | be reserved there. We use these in step n1. | |
1438 | ||
1439 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1440 | address, and makes any necessary adjustments to the instruction, | |
1441 | register contents, and memory. We use this in step n1. | |
1442 | ||
1443 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1444 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1445 | same effect the instruction would have had if we had executed it |
1446 | at its original address. We use this in step n3. | |
1447 | ||
237fc4c9 PA |
1448 | The gdbarch_displaced_step_copy_insn and |
1449 | gdbarch_displaced_step_fixup functions must be written so that | |
1450 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1451 | single-stepping across the copied instruction, and then applying | |
1452 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1453 | thread's memory and registers as stepping the instruction in place | |
1454 | would have. Exactly which responsibilities fall to the copy and | |
1455 | which fall to the fixup is up to the author of those functions. | |
1456 | ||
1457 | See the comments in gdbarch.sh for details. | |
1458 | ||
1459 | Note that displaced stepping and software single-step cannot | |
1460 | currently be used in combination, although with some care I think | |
1461 | they could be made to. Software single-step works by placing | |
1462 | breakpoints on all possible subsequent instructions; if the | |
1463 | displaced instruction is a PC-relative jump, those breakpoints | |
1464 | could fall in very strange places --- on pages that aren't | |
1465 | executable, or at addresses that are not proper instruction | |
1466 | boundaries. (We do generally let other threads run while we wait | |
1467 | to hit the software single-step breakpoint, and they might | |
1468 | encounter such a corrupted instruction.) One way to work around | |
1469 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1470 | simulate the effect of PC-relative instructions (and return NULL) | |
1471 | on architectures that use software single-stepping. | |
1472 | ||
1473 | In non-stop mode, we can have independent and simultaneous step | |
1474 | requests, so more than one thread may need to simultaneously step | |
1475 | over a breakpoint. The current implementation assumes there is | |
1476 | only one scratch space per process. In this case, we have to | |
1477 | serialize access to the scratch space. If thread A wants to step | |
1478 | over a breakpoint, but we are currently waiting for some other | |
1479 | thread to complete a displaced step, we leave thread A stopped and | |
1480 | place it in the displaced_step_request_queue. Whenever a displaced | |
1481 | step finishes, we pick the next thread in the queue and start a new | |
1482 | displaced step operation on it. See displaced_step_prepare and | |
1483 | displaced_step_fixup for details. */ | |
1484 | ||
9844051a | 1485 | /* Get the displaced stepping state of inferior INF. */ |
fc1cf338 | 1486 | |
39a36629 | 1487 | static displaced_step_inferior_state * |
00431a78 | 1488 | get_displaced_stepping_state (inferior *inf) |
fc1cf338 | 1489 | { |
d20172fc | 1490 | return &inf->displaced_step_state; |
fc1cf338 PA |
1491 | } |
1492 | ||
9844051a | 1493 | /* Get the displaced stepping state of thread THREAD. */ |
372316f1 | 1494 | |
9844051a SM |
1495 | static displaced_step_thread_state * |
1496 | get_displaced_stepping_state (thread_info *thread) | |
372316f1 | 1497 | { |
9844051a | 1498 | return &thread->displaced_step_state; |
372316f1 PA |
1499 | } |
1500 | ||
9844051a | 1501 | /* Return true if the given thread is doing a displaced step. */ |
c0987663 | 1502 | |
9844051a SM |
1503 | static bool |
1504 | displaced_step_in_progress (thread_info *thread) | |
c0987663 | 1505 | { |
00431a78 | 1506 | gdb_assert (thread != NULL); |
c0987663 | 1507 | |
9844051a | 1508 | return get_displaced_stepping_state (thread)->in_progress (); |
c0987663 YQ |
1509 | } |
1510 | ||
9844051a | 1511 | /* Return true if any thread of this inferior is doing a displaced step. */ |
8f572e5c | 1512 | |
9844051a | 1513 | static bool |
00431a78 | 1514 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1515 | { |
9844051a SM |
1516 | for (thread_info *thread : inf->non_exited_threads ()) |
1517 | { | |
1518 | if (displaced_step_in_progress (thread)) | |
1519 | return true; | |
1520 | } | |
1521 | ||
1522 | return false; | |
1523 | } | |
1524 | ||
1525 | /* Return true if any thread is doing a displaced step. */ | |
1526 | ||
1527 | static bool | |
1528 | displaced_step_in_progress_any_thread () | |
1529 | { | |
1530 | for (thread_info *thread : all_non_exited_threads ()) | |
1531 | { | |
1532 | if (displaced_step_in_progress (thread)) | |
1533 | return true; | |
1534 | } | |
1535 | ||
1536 | return false; | |
fc1cf338 PA |
1537 | } |
1538 | ||
a42244db | 1539 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
7ccba087 | 1540 | of copy area, return corresponding displaced_step_copy_insn_closure. Otherwise, |
a42244db YQ |
1541 | return NULL. */ |
1542 | ||
7ccba087 SM |
1543 | struct displaced_step_copy_insn_closure * |
1544 | get_displaced_step_copy_insn_closure_by_addr (CORE_ADDR addr) | |
a42244db | 1545 | { |
9844051a SM |
1546 | // FIXME: implement me (only needed on ARM). |
1547 | // displaced_step_inferior_state *displaced | |
1548 | // = get_displaced_stepping_state (current_inferior ()); | |
1549 | // | |
1550 | // /* If checking the mode of displaced instruction in copy area. */ | |
1551 | // if (displaced->step_thread != nullptr | |
1552 | // && displaced->step_copy == addr) | |
1553 | // return displaced->step_closure.get (); | |
1554 | // | |
a42244db YQ |
1555 | return NULL; |
1556 | } | |
1557 | ||
fc1cf338 PA |
1558 | static void |
1559 | infrun_inferior_exit (struct inferior *inf) | |
1560 | { | |
d20172fc | 1561 | inf->displaced_step_state.reset (); |
fc1cf338 | 1562 | } |
237fc4c9 | 1563 | |
fff08868 HZ |
1564 | /* If ON, and the architecture supports it, GDB will use displaced |
1565 | stepping to step over breakpoints. If OFF, or if the architecture | |
1566 | doesn't support it, GDB will instead use the traditional | |
1567 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1568 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1569 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1570 | |
72d0e2c5 | 1571 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1572 | |
237fc4c9 PA |
1573 | static void |
1574 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1575 | struct cmd_list_element *c, | |
1576 | const char *value) | |
1577 | { | |
72d0e2c5 | 1578 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1579 | fprintf_filtered (file, |
1580 | _("Debugger's willingness to use displaced stepping " | |
1581 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1582 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1583 | else |
3e43a32a MS |
1584 | fprintf_filtered (file, |
1585 | _("Debugger's willingness to use displaced stepping " | |
1586 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1587 | } |
1588 | ||
5f38b1b8 | 1589 | /* Return true if the target behing THREAD supports displaced stepping. */ |
9822cb57 SM |
1590 | |
1591 | static bool | |
5f38b1b8 | 1592 | target_supports_displaced_stepping (thread_info *thread) |
9822cb57 | 1593 | { |
5f38b1b8 SM |
1594 | inferior *inf = thread->inf; |
1595 | target_ops *target = inf->top_target (); | |
1596 | ||
1597 | return target->supports_displaced_step (thread); | |
9822cb57 SM |
1598 | } |
1599 | ||
fff08868 | 1600 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1601 | over breakpoints of thread TP. */ |
fff08868 | 1602 | |
9822cb57 SM |
1603 | static bool |
1604 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1605 | { |
9822cb57 SM |
1606 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1607 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1608 | return false; | |
1609 | ||
1610 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1611 | way. */ | |
1612 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1613 | && !target_is_non_stop_p ()) | |
1614 | return false; | |
1615 | ||
5f38b1b8 SM |
1616 | /* If the target doesn't support displaced stepping, don't use it. */ |
1617 | if (!target_supports_displaced_stepping (tp)) | |
9822cb57 SM |
1618 | return false; |
1619 | ||
1620 | /* If recording, don't use displaced stepping. */ | |
1621 | if (find_record_target () != nullptr) | |
1622 | return false; | |
1623 | ||
d20172fc SM |
1624 | displaced_step_inferior_state *displaced_state |
1625 | = get_displaced_stepping_state (tp->inf); | |
3fc8eb30 | 1626 | |
9822cb57 SM |
1627 | /* If displaced stepping failed before for this inferior, don't bother trying |
1628 | again. */ | |
1629 | if (displaced_state->failed_before) | |
1630 | return false; | |
1631 | ||
1632 | return true; | |
237fc4c9 PA |
1633 | } |
1634 | ||
9844051a | 1635 | /* Simple function wrapper around displaced_step_thread_state::reset. */ |
d8d83535 | 1636 | |
237fc4c9 | 1637 | static void |
9844051a | 1638 | displaced_step_reset (displaced_step_thread_state *displaced) |
237fc4c9 | 1639 | { |
d8d83535 | 1640 | displaced->reset (); |
237fc4c9 PA |
1641 | } |
1642 | ||
d8d83535 SM |
1643 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1644 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1645 | ||
1646 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 PA |
1647 | |
1648 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1649 | void | |
1650 | displaced_step_dump_bytes (struct ui_file *file, | |
1651 | const gdb_byte *buf, | |
1652 | size_t len) | |
1653 | { | |
1654 | int i; | |
1655 | ||
1656 | for (i = 0; i < len; i++) | |
1657 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1658 | fputs_unfiltered ("\n", file); | |
1659 | } | |
1660 | ||
1661 | /* Prepare to single-step, using displaced stepping. | |
1662 | ||
1663 | Note that we cannot use displaced stepping when we have a signal to | |
1664 | deliver. If we have a signal to deliver and an instruction to step | |
1665 | over, then after the step, there will be no indication from the | |
1666 | target whether the thread entered a signal handler or ignored the | |
1667 | signal and stepped over the instruction successfully --- both cases | |
1668 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1669 | fixup, and in the second case we must --- but we can't tell which. | |
1670 | Comments in the code for 'random signals' in handle_inferior_event | |
1671 | explain how we handle this case instead. | |
1672 | ||
1673 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1674 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1675 | if this instruction can't be displaced stepped. */ | |
1676 | ||
9844051a | 1677 | static displaced_step_prepare_status |
00431a78 | 1678 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1679 | { |
00431a78 | 1680 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1681 | struct gdbarch *gdbarch = regcache->arch (); |
9844051a SM |
1682 | displaced_step_thread_state *thread_disp_step_state |
1683 | = get_displaced_stepping_state (tp); | |
237fc4c9 | 1684 | |
5f38b1b8 | 1685 | /* We should never reach this function if the target does not |
237fc4c9 | 1686 | support displaced stepping. */ |
5f38b1b8 | 1687 | gdb_assert (target_supports_displaced_stepping (tp)); |
237fc4c9 | 1688 | |
c2829269 PA |
1689 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1690 | gdb_assert (tp->control.trap_expected); | |
1691 | ||
c1e36e3e PA |
1692 | /* Disable range stepping while executing in the scratch pad. We |
1693 | want a single-step even if executing the displaced instruction in | |
1694 | the scratch buffer lands within the stepping range (e.g., a | |
1695 | jump/branch). */ | |
1696 | tp->control.may_range_step = 0; | |
1697 | ||
9844051a SM |
1698 | /* We are about to start a displaced step for this thread, if one is already |
1699 | in progress, we goofed up somewhere. */ | |
1700 | gdb_assert (!thread_disp_step_state->in_progress ()); | |
237fc4c9 | 1701 | |
9844051a | 1702 | scoped_restore_current_thread restore_thread; |
fc1cf338 | 1703 | |
9844051a SM |
1704 | switch_to_thread (tp); |
1705 | ||
1706 | CORE_ADDR original_pc = regcache_read_pc (regcache); | |
1707 | ||
1708 | displaced_step_prepare_status status = | |
768e1fd2 | 1709 | tp->inf->top_target ()->displaced_step_prepare (tp); |
237fc4c9 | 1710 | |
9844051a SM |
1711 | if (status == DISPLACED_STEP_PREPARE_STATUS_ERROR) |
1712 | { | |
237fc4c9 PA |
1713 | if (debug_displaced) |
1714 | fprintf_unfiltered (gdb_stdlog, | |
9844051a | 1715 | "displaced: failed to prepare (%s)", |
a068643d | 1716 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 | 1717 | |
9844051a | 1718 | return DISPLACED_STEP_PREPARE_STATUS_ERROR; |
237fc4c9 | 1719 | } |
9844051a | 1720 | else if (status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
237fc4c9 | 1721 | { |
9844051a SM |
1722 | /* Not enough displaced stepping resources available, defer this |
1723 | request by placing it the queue. */ | |
1724 | ||
237fc4c9 PA |
1725 | if (debug_displaced) |
1726 | fprintf_unfiltered (gdb_stdlog, | |
9844051a SM |
1727 | "displaced: not enough resources available, " |
1728 | "deferring step of %s\n", | |
a068643d | 1729 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 | 1730 | |
9844051a | 1731 | global_thread_step_over_chain_enqueue (tp); |
effb9843 | 1732 | tp->inf->displaced_step_state.unavailable = true; |
d35ae833 | 1733 | |
9844051a | 1734 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; |
d35ae833 PA |
1735 | } |
1736 | ||
9844051a SM |
1737 | gdb_assert (status == DISPLACED_STEP_PREPARE_STATUS_OK); |
1738 | ||
1739 | // FIXME: Should probably replicated in the arch implementation now. | |
1740 | // | |
1741 | // if (breakpoint_in_range_p (aspace, copy, len)) | |
1742 | // { | |
1743 | // /* There's a breakpoint set in the scratch pad location range | |
1744 | // (which is usually around the entry point). We'd either | |
1745 | // install it before resuming, which would overwrite/corrupt the | |
1746 | // scratch pad, or if it was already inserted, this displaced | |
1747 | // step would overwrite it. The latter is OK in the sense that | |
1748 | // we already assume that no thread is going to execute the code | |
1749 | // in the scratch pad range (after initial startup) anyway, but | |
1750 | // the former is unacceptable. Simply punt and fallback to | |
1751 | // stepping over this breakpoint in-line. */ | |
1752 | // if (debug_displaced) | |
1753 | // { | |
1754 | // fprintf_unfiltered (gdb_stdlog, | |
1755 | // "displaced: breakpoint set in scratch pad. " | |
1756 | // "Stepping over breakpoint in-line instead.\n"); | |
1757 | // } | |
1758 | // | |
1759 | // gdb_assert (false); | |
1760 | // gdbarch_displaced_step_release_location (gdbarch, copy); | |
1761 | // | |
1762 | // return -1; | |
1763 | // } | |
237fc4c9 | 1764 | |
9f5a595d UW |
1765 | /* Save the information we need to fix things up if the step |
1766 | succeeds. */ | |
9844051a | 1767 | thread_disp_step_state->set (gdbarch); |
9f5a595d | 1768 | |
9844051a SM |
1769 | // FIXME: get it from _prepare? |
1770 | CORE_ADDR displaced_pc = 0; | |
ad53cd71 | 1771 | |
237fc4c9 | 1772 | if (debug_displaced) |
9844051a SM |
1773 | fprintf_unfiltered (gdb_stdlog, |
1774 | "displaced: prepared successfully thread=%s, " | |
1775 | "original_pc=%s, displaced_pc=%s\n", | |
1776 | target_pid_to_str (tp->ptid).c_str (), | |
1777 | paddress (gdbarch, original_pc), | |
1778 | paddress (gdbarch, displaced_pc)); | |
1779 | ||
1780 | return DISPLACED_STEP_PREPARE_STATUS_OK; | |
237fc4c9 PA |
1781 | } |
1782 | ||
3fc8eb30 PA |
1783 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1784 | attempts at displaced stepping if we get a memory error. */ | |
1785 | ||
9844051a | 1786 | static displaced_step_prepare_status |
00431a78 | 1787 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 | 1788 | { |
9844051a SM |
1789 | displaced_step_prepare_status status |
1790 | = DISPLACED_STEP_PREPARE_STATUS_ERROR; | |
3fc8eb30 | 1791 | |
a70b8144 | 1792 | try |
3fc8eb30 | 1793 | { |
9844051a | 1794 | status = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1795 | } |
230d2906 | 1796 | catch (const gdb_exception_error &ex) |
3fc8eb30 PA |
1797 | { |
1798 | struct displaced_step_inferior_state *displaced_state; | |
1799 | ||
16b41842 PA |
1800 | if (ex.error != MEMORY_ERROR |
1801 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1802 | throw; |
3fc8eb30 | 1803 | |
edbcda09 SM |
1804 | infrun_log_debug ("caught exception, disabling displaced stepping: %s", |
1805 | ex.what ()); | |
3fc8eb30 PA |
1806 | |
1807 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1808 | "auto". */ | |
1809 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1810 | { | |
fd7dcb94 | 1811 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1812 | ex.what ()); |
3fc8eb30 PA |
1813 | } |
1814 | ||
1815 | /* Disable further displaced stepping attempts. */ | |
1816 | displaced_state | |
00431a78 | 1817 | = get_displaced_stepping_state (thread->inf); |
3fc8eb30 PA |
1818 | displaced_state->failed_before = 1; |
1819 | } | |
3fc8eb30 | 1820 | |
9844051a | 1821 | return status; |
e2d96639 YQ |
1822 | } |
1823 | ||
372316f1 PA |
1824 | /* If we displaced stepped an instruction successfully, adjust |
1825 | registers and memory to yield the same effect the instruction would | |
1826 | have had if we had executed it at its original address, and return | |
1827 | 1. If the instruction didn't complete, relocate the PC and return | |
1828 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1829 | ||
1830 | static int | |
9844051a | 1831 | displaced_step_finish (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1832 | { |
9844051a SM |
1833 | displaced_step_thread_state *displaced |
1834 | = get_displaced_stepping_state (event_thread); | |
fc1cf338 | 1835 | |
9844051a SM |
1836 | /* Was this thread performing a displaced step? */ |
1837 | if (!displaced->in_progress ()) | |
372316f1 | 1838 | return 0; |
237fc4c9 | 1839 | |
9844051a SM |
1840 | displaced_step_reset_cleanup cleanup (displaced); |
1841 | ||
cb71640d PA |
1842 | /* Fixup may need to read memory/registers. Switch to the thread |
1843 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
d43b7a2d TBA |
1844 | the current thread, and displaced_step_restore performs ptid-dependent |
1845 | memory accesses using current_inferior() and current_top_target(). */ | |
00431a78 | 1846 | switch_to_thread (event_thread); |
cb71640d | 1847 | |
9844051a SM |
1848 | /* Do the fixup, and release the resources acquired to do the displaced |
1849 | step. */ | |
1850 | displaced_step_finish_status finish_status = | |
768e1fd2 SM |
1851 | event_thread->inf->top_target ()->displaced_step_finish (event_thread, |
1852 | signal); | |
d43b7a2d | 1853 | |
9844051a SM |
1854 | if (finish_status == DISPLACED_STEP_FINISH_STATUS_OK) |
1855 | return 1; | |
237fc4c9 | 1856 | else |
9844051a | 1857 | return -1; |
c2829269 | 1858 | } |
1c5cfe86 | 1859 | |
4d9d9d04 PA |
1860 | /* Data to be passed around while handling an event. This data is |
1861 | discarded between events. */ | |
1862 | struct execution_control_state | |
1863 | { | |
5b6d1e4f | 1864 | process_stratum_target *target; |
4d9d9d04 PA |
1865 | ptid_t ptid; |
1866 | /* The thread that got the event, if this was a thread event; NULL | |
1867 | otherwise. */ | |
1868 | struct thread_info *event_thread; | |
1869 | ||
1870 | struct target_waitstatus ws; | |
1871 | int stop_func_filled_in; | |
1872 | CORE_ADDR stop_func_start; | |
1873 | CORE_ADDR stop_func_end; | |
1874 | const char *stop_func_name; | |
1875 | int wait_some_more; | |
1876 | ||
1877 | /* True if the event thread hit the single-step breakpoint of | |
1878 | another thread. Thus the event doesn't cause a stop, the thread | |
1879 | needs to be single-stepped past the single-step breakpoint before | |
1880 | we can switch back to the original stepping thread. */ | |
1881 | int hit_singlestep_breakpoint; | |
1882 | }; | |
1883 | ||
1884 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1885 | |
1886 | static void | |
4d9d9d04 PA |
1887 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1888 | { | |
1889 | memset (ecs, 0, sizeof (*ecs)); | |
1890 | ecs->event_thread = tp; | |
1891 | ecs->ptid = tp->ptid; | |
1892 | } | |
1893 | ||
1894 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1895 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 1896 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1897 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1898 | |
1899 | /* Are there any pending step-over requests? If so, run all we can | |
1900 | now and return true. Otherwise, return false. */ | |
1901 | ||
1902 | static int | |
c2829269 PA |
1903 | start_step_over (void) |
1904 | { | |
1905 | struct thread_info *tp, *next; | |
9844051a | 1906 | int started = 0; |
c2829269 | 1907 | |
372316f1 PA |
1908 | /* Don't start a new step-over if we already have an in-line |
1909 | step-over operation ongoing. */ | |
1910 | if (step_over_info_valid_p ()) | |
9844051a SM |
1911 | return started; |
1912 | ||
1913 | /* Steal the global thread step over chain. */ | |
1914 | thread_info *threads_to_step = global_thread_step_over_chain_head; | |
1915 | global_thread_step_over_chain_head = NULL; | |
1916 | ||
1917 | if (debug_infrun) | |
1918 | fprintf_unfiltered (gdb_stdlog, | |
1919 | "infrun: stealing list of %d threads to step from global queue\n", | |
1920 | thread_step_over_chain_length (threads_to_step)); | |
372316f1 | 1921 | |
effb9843 SM |
1922 | for (inferior *inf : all_inferiors ()) |
1923 | inf->displaced_step_state.unavailable = false; | |
1924 | ||
9844051a | 1925 | for (tp = threads_to_step; tp != NULL; tp = next) |
237fc4c9 | 1926 | { |
4d9d9d04 PA |
1927 | struct execution_control_state ecss; |
1928 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1929 | step_over_what step_what; |
372316f1 | 1930 | int must_be_in_line; |
c2829269 | 1931 | |
c65d6b55 PA |
1932 | gdb_assert (!tp->stop_requested); |
1933 | ||
9844051a | 1934 | next = thread_step_over_chain_next (threads_to_step, tp); |
c2829269 | 1935 | |
372316f1 PA |
1936 | step_what = thread_still_needs_step_over (tp); |
1937 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1938 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1939 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1940 | |
1941 | /* We currently stop all threads of all processes to step-over | |
1942 | in-line. If we need to start a new in-line step-over, let | |
1943 | any pending displaced steps finish first. */ | |
9844051a SM |
1944 | if (must_be_in_line && displaced_step_in_progress_any_thread ()) |
1945 | continue; | |
c2829269 | 1946 | |
9844051a | 1947 | thread_step_over_chain_remove (&threads_to_step, tp); |
c2829269 | 1948 | |
372316f1 PA |
1949 | if (tp->control.trap_expected |
1950 | || tp->resumed | |
1951 | || tp->executing) | |
ad53cd71 | 1952 | { |
4d9d9d04 PA |
1953 | internal_error (__FILE__, __LINE__, |
1954 | "[%s] has inconsistent state: " | |
372316f1 | 1955 | "trap_expected=%d, resumed=%d, executing=%d\n", |
a068643d | 1956 | target_pid_to_str (tp->ptid).c_str (), |
4d9d9d04 | 1957 | tp->control.trap_expected, |
372316f1 | 1958 | tp->resumed, |
4d9d9d04 | 1959 | tp->executing); |
ad53cd71 | 1960 | } |
1c5cfe86 | 1961 | |
edbcda09 SM |
1962 | infrun_log_debug ("resuming [%s] for step-over", |
1963 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 PA |
1964 | |
1965 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
1966 | is no longer inserted. In all-stop, we want to keep looking | |
1967 | for a thread that needs a step-over instead of resuming TP, | |
1968 | because we wouldn't be able to resume anything else until the | |
1969 | target stops again. In non-stop, the resume always resumes | |
1970 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 1971 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 1972 | continue; |
8550d3b3 | 1973 | |
effb9843 SM |
1974 | if (tp->inf->displaced_step_state.unavailable) |
1975 | { | |
1976 | global_thread_step_over_chain_enqueue (tp); | |
1977 | continue; | |
1978 | } | |
1979 | ||
00431a78 | 1980 | switch_to_thread (tp); |
4d9d9d04 PA |
1981 | reset_ecs (ecs, tp); |
1982 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 1983 | |
4d9d9d04 PA |
1984 | if (!ecs->wait_some_more) |
1985 | error (_("Command aborted.")); | |
1c5cfe86 | 1986 | |
9844051a SM |
1987 | /* If the thread's step over could not be initiated, it was re-added |
1988 | to the global step over chain. */ | |
1989 | if (tp->resumed) | |
1990 | { | |
1991 | infrun_log_debug ("start_step_over: [%s] was resumed.\n", | |
1992 | target_pid_to_str (tp->ptid).c_str ()); | |
1993 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
1994 | } | |
1995 | else | |
1996 | { | |
1997 | infrun_log_debug ("infrun: start_step_over: [%s] was NOT resumed.\n", | |
1998 | target_pid_to_str (tp->ptid).c_str ()); | |
1999 | gdb_assert (thread_is_in_step_over_chain (tp)); | |
2000 | ||
2001 | } | |
372316f1 PA |
2002 | |
2003 | /* If we started a new in-line step-over, we're done. */ | |
2004 | if (step_over_info_valid_p ()) | |
2005 | { | |
2006 | gdb_assert (tp->control.trap_expected); | |
9844051a SM |
2007 | started = 1; |
2008 | break; | |
372316f1 PA |
2009 | } |
2010 | ||
fbea99ea | 2011 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2012 | { |
2013 | /* On all-stop, shouldn't have resumed unless we needed a | |
2014 | step over. */ | |
2015 | gdb_assert (tp->control.trap_expected | |
2016 | || tp->step_after_step_resume_breakpoint); | |
2017 | ||
2018 | /* With remote targets (at least), in all-stop, we can't | |
2019 | issue any further remote commands until the program stops | |
2020 | again. */ | |
9844051a SM |
2021 | started = 1; |
2022 | break; | |
1c5cfe86 | 2023 | } |
c2829269 | 2024 | |
4d9d9d04 PA |
2025 | /* Either the thread no longer needed a step-over, or a new |
2026 | displaced stepping sequence started. Even in the latter | |
2027 | case, continue looking. Maybe we can also start another | |
2028 | displaced step on a thread of other process. */ | |
237fc4c9 | 2029 | } |
4d9d9d04 | 2030 | |
9844051a SM |
2031 | /* If there are threads left in the THREADS_TO_STEP list, but we have |
2032 | detected that we can't start anything more, put back these threads | |
2033 | in the global list. */ | |
2034 | if (threads_to_step == NULL) | |
2035 | { | |
2036 | if (debug_infrun) | |
2037 | fprintf_unfiltered (gdb_stdlog, | |
2038 | "infrun: step-over queue now empty\n"); | |
2039 | } | |
2040 | else | |
2041 | { | |
2042 | if (debug_infrun) | |
2043 | fprintf_unfiltered (gdb_stdlog, | |
2044 | "infrun: putting back %d threads to step in global queue\n", | |
2045 | thread_step_over_chain_length (threads_to_step)); | |
2046 | while (threads_to_step != nullptr) | |
2047 | { | |
2048 | thread_info *thread = threads_to_step; | |
2049 | ||
2050 | /* Remove from that list. */ | |
2051 | thread_step_over_chain_remove (&threads_to_step, thread); | |
2052 | ||
2053 | /* Add to global list. */ | |
2054 | global_thread_step_over_chain_enqueue (thread); | |
2055 | ||
2056 | } | |
2057 | } | |
2058 | ||
2059 | return started; | |
237fc4c9 PA |
2060 | } |
2061 | ||
5231c1fd PA |
2062 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2063 | holding OLD_PTID. */ | |
2064 | static void | |
2065 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2066 | { | |
d7e15655 | 2067 | if (inferior_ptid == old_ptid) |
5231c1fd | 2068 | inferior_ptid = new_ptid; |
5231c1fd PA |
2069 | } |
2070 | ||
237fc4c9 | 2071 | \f |
c906108c | 2072 | |
53904c9e AC |
2073 | static const char schedlock_off[] = "off"; |
2074 | static const char schedlock_on[] = "on"; | |
2075 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2076 | static const char schedlock_replay[] = "replay"; |
40478521 | 2077 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2078 | schedlock_off, |
2079 | schedlock_on, | |
2080 | schedlock_step, | |
f2665db5 | 2081 | schedlock_replay, |
ef346e04 AC |
2082 | NULL |
2083 | }; | |
f2665db5 | 2084 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2085 | static void |
2086 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2087 | struct cmd_list_element *c, const char *value) | |
2088 | { | |
3e43a32a MS |
2089 | fprintf_filtered (file, |
2090 | _("Mode for locking scheduler " | |
2091 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2092 | value); |
2093 | } | |
c906108c SS |
2094 | |
2095 | static void | |
eb4c3f4a | 2096 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2097 | { |
eefe576e AC |
2098 | if (!target_can_lock_scheduler) |
2099 | { | |
2100 | scheduler_mode = schedlock_off; | |
2101 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2102 | } | |
c906108c SS |
2103 | } |
2104 | ||
d4db2f36 PA |
2105 | /* True if execution commands resume all threads of all processes by |
2106 | default; otherwise, resume only threads of the current inferior | |
2107 | process. */ | |
491144b5 | 2108 | bool sched_multi = false; |
d4db2f36 | 2109 | |
2facfe5c DD |
2110 | /* Try to setup for software single stepping over the specified location. |
2111 | Return 1 if target_resume() should use hardware single step. | |
2112 | ||
2113 | GDBARCH the current gdbarch. | |
2114 | PC the location to step over. */ | |
2115 | ||
2116 | static int | |
2117 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2118 | { | |
2119 | int hw_step = 1; | |
2120 | ||
f02253f1 | 2121 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2122 | && gdbarch_software_single_step_p (gdbarch)) |
2123 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2124 | ||
2facfe5c DD |
2125 | return hw_step; |
2126 | } | |
c906108c | 2127 | |
f3263aa4 PA |
2128 | /* See infrun.h. */ |
2129 | ||
09cee04b PA |
2130 | ptid_t |
2131 | user_visible_resume_ptid (int step) | |
2132 | { | |
f3263aa4 | 2133 | ptid_t resume_ptid; |
09cee04b | 2134 | |
09cee04b PA |
2135 | if (non_stop) |
2136 | { | |
2137 | /* With non-stop mode on, threads are always handled | |
2138 | individually. */ | |
2139 | resume_ptid = inferior_ptid; | |
2140 | } | |
2141 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2142 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2143 | { |
f3263aa4 PA |
2144 | /* User-settable 'scheduler' mode requires solo thread |
2145 | resume. */ | |
09cee04b PA |
2146 | resume_ptid = inferior_ptid; |
2147 | } | |
f2665db5 MM |
2148 | else if ((scheduler_mode == schedlock_replay) |
2149 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2150 | { | |
2151 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2152 | mode. */ | |
2153 | resume_ptid = inferior_ptid; | |
2154 | } | |
f3263aa4 PA |
2155 | else if (!sched_multi && target_supports_multi_process ()) |
2156 | { | |
2157 | /* Resume all threads of the current process (and none of other | |
2158 | processes). */ | |
e99b03dc | 2159 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2160 | } |
2161 | else | |
2162 | { | |
2163 | /* Resume all threads of all processes. */ | |
2164 | resume_ptid = RESUME_ALL; | |
2165 | } | |
09cee04b PA |
2166 | |
2167 | return resume_ptid; | |
2168 | } | |
2169 | ||
5b6d1e4f PA |
2170 | /* See infrun.h. */ |
2171 | ||
2172 | process_stratum_target * | |
2173 | user_visible_resume_target (ptid_t resume_ptid) | |
2174 | { | |
2175 | return (resume_ptid == minus_one_ptid && sched_multi | |
2176 | ? NULL | |
2177 | : current_inferior ()->process_target ()); | |
2178 | } | |
2179 | ||
fbea99ea PA |
2180 | /* Return a ptid representing the set of threads that we will resume, |
2181 | in the perspective of the target, assuming run control handling | |
2182 | does not require leaving some threads stopped (e.g., stepping past | |
2183 | breakpoint). USER_STEP indicates whether we're about to start the | |
2184 | target for a stepping command. */ | |
2185 | ||
2186 | static ptid_t | |
2187 | internal_resume_ptid (int user_step) | |
2188 | { | |
2189 | /* In non-stop, we always control threads individually. Note that | |
2190 | the target may always work in non-stop mode even with "set | |
2191 | non-stop off", in which case user_visible_resume_ptid could | |
2192 | return a wildcard ptid. */ | |
2193 | if (target_is_non_stop_p ()) | |
2194 | return inferior_ptid; | |
2195 | else | |
2196 | return user_visible_resume_ptid (user_step); | |
2197 | } | |
2198 | ||
64ce06e4 PA |
2199 | /* Wrapper for target_resume, that handles infrun-specific |
2200 | bookkeeping. */ | |
2201 | ||
2202 | static void | |
2203 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2204 | { | |
2205 | struct thread_info *tp = inferior_thread (); | |
2206 | ||
c65d6b55 PA |
2207 | gdb_assert (!tp->stop_requested); |
2208 | ||
64ce06e4 | 2209 | /* Install inferior's terminal modes. */ |
223ffa71 | 2210 | target_terminal::inferior (); |
64ce06e4 PA |
2211 | |
2212 | /* Avoid confusing the next resume, if the next stop/resume | |
2213 | happens to apply to another thread. */ | |
2214 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2215 | ||
8f572e5c PA |
2216 | /* Advise target which signals may be handled silently. |
2217 | ||
2218 | If we have removed breakpoints because we are stepping over one | |
2219 | in-line (in any thread), we need to receive all signals to avoid | |
2220 | accidentally skipping a breakpoint during execution of a signal | |
2221 | handler. | |
2222 | ||
2223 | Likewise if we're displaced stepping, otherwise a trap for a | |
2224 | breakpoint in a signal handler might be confused with the | |
2225 | displaced step finishing. We don't make the displaced_step_fixup | |
2226 | step distinguish the cases instead, because: | |
2227 | ||
2228 | - a backtrace while stopped in the signal handler would show the | |
2229 | scratch pad as frame older than the signal handler, instead of | |
2230 | the real mainline code. | |
2231 | ||
2232 | - when the thread is later resumed, the signal handler would | |
2233 | return to the scratch pad area, which would no longer be | |
2234 | valid. */ | |
2235 | if (step_over_info_valid_p () | |
00431a78 | 2236 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2237 | target_pass_signals ({}); |
64ce06e4 | 2238 | else |
adc6a863 | 2239 | target_pass_signals (signal_pass); |
64ce06e4 PA |
2240 | |
2241 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2242 | |
2243 | target_commit_resume (); | |
5b6d1e4f PA |
2244 | |
2245 | if (target_can_async_p ()) | |
2246 | target_async (1); | |
64ce06e4 PA |
2247 | } |
2248 | ||
d930703d | 2249 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2250 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2251 | call 'resume', which handles exceptions. */ | |
c906108c | 2252 | |
71d378ae PA |
2253 | static void |
2254 | resume_1 (enum gdb_signal sig) | |
c906108c | 2255 | { |
515630c5 | 2256 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2257 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2258 | struct thread_info *tp = inferior_thread (); |
8b86c959 | 2259 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2260 | ptid_t resume_ptid; |
856e7dd6 PA |
2261 | /* This represents the user's step vs continue request. When |
2262 | deciding whether "set scheduler-locking step" applies, it's the | |
2263 | user's intention that counts. */ | |
2264 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2265 | /* This represents what we'll actually request the target to do. |
2266 | This can decay from a step to a continue, if e.g., we need to | |
2267 | implement single-stepping with breakpoints (software | |
2268 | single-step). */ | |
6b403daa | 2269 | int step; |
c7e8a53c | 2270 | |
c65d6b55 | 2271 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2272 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2273 | ||
372316f1 PA |
2274 | if (tp->suspend.waitstatus_pending_p) |
2275 | { | |
edbcda09 SM |
2276 | infrun_log_debug |
2277 | ("thread %s has pending wait " | |
2278 | "status %s (currently_stepping=%d).", | |
2279 | target_pid_to_str (tp->ptid).c_str (), | |
2280 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2281 | currently_stepping (tp)); | |
372316f1 | 2282 | |
5b6d1e4f | 2283 | tp->inf->process_target ()->threads_executing = true; |
719546c4 | 2284 | tp->resumed = true; |
372316f1 PA |
2285 | |
2286 | /* FIXME: What should we do if we are supposed to resume this | |
2287 | thread with a signal? Maybe we should maintain a queue of | |
2288 | pending signals to deliver. */ | |
2289 | if (sig != GDB_SIGNAL_0) | |
2290 | { | |
fd7dcb94 | 2291 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d TT |
2292 | gdb_signal_to_name (sig), |
2293 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2294 | } |
2295 | ||
2296 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2297 | |
2298 | if (target_can_async_p ()) | |
9516f85a AB |
2299 | { |
2300 | target_async (1); | |
2301 | /* Tell the event loop we have an event to process. */ | |
2302 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2303 | } | |
372316f1 PA |
2304 | return; |
2305 | } | |
2306 | ||
2307 | tp->stepped_breakpoint = 0; | |
2308 | ||
6b403daa PA |
2309 | /* Depends on stepped_breakpoint. */ |
2310 | step = currently_stepping (tp); | |
2311 | ||
74609e71 YQ |
2312 | if (current_inferior ()->waiting_for_vfork_done) |
2313 | { | |
48f9886d PA |
2314 | /* Don't try to single-step a vfork parent that is waiting for |
2315 | the child to get out of the shared memory region (by exec'ing | |
2316 | or exiting). This is particularly important on software | |
2317 | single-step archs, as the child process would trip on the | |
2318 | software single step breakpoint inserted for the parent | |
2319 | process. Since the parent will not actually execute any | |
2320 | instruction until the child is out of the shared region (such | |
2321 | are vfork's semantics), it is safe to simply continue it. | |
2322 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2323 | the parent, and tell it to `keep_going', which automatically | |
2324 | re-sets it stepping. */ | |
edbcda09 | 2325 | infrun_log_debug ("resume : clear step"); |
a09dd441 | 2326 | step = 0; |
74609e71 YQ |
2327 | } |
2328 | ||
7ca9b62a TBA |
2329 | CORE_ADDR pc = regcache_read_pc (regcache); |
2330 | ||
edbcda09 SM |
2331 | infrun_log_debug ("step=%d, signal=%s, trap_expected=%d, " |
2332 | "current thread [%s] at %s", | |
2333 | step, gdb_signal_to_symbol_string (sig), | |
2334 | tp->control.trap_expected, | |
2335 | target_pid_to_str (inferior_ptid).c_str (), | |
2336 | paddress (gdbarch, pc)); | |
c906108c | 2337 | |
c2c6d25f JM |
2338 | /* Normally, by the time we reach `resume', the breakpoints are either |
2339 | removed or inserted, as appropriate. The exception is if we're sitting | |
2340 | at a permanent breakpoint; we need to step over it, but permanent | |
2341 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2342 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2343 | { |
af48d08f PA |
2344 | if (sig != GDB_SIGNAL_0) |
2345 | { | |
2346 | /* We have a signal to pass to the inferior. The resume | |
2347 | may, or may not take us to the signal handler. If this | |
2348 | is a step, we'll need to stop in the signal handler, if | |
2349 | there's one, (if the target supports stepping into | |
2350 | handlers), or in the next mainline instruction, if | |
2351 | there's no handler. If this is a continue, we need to be | |
2352 | sure to run the handler with all breakpoints inserted. | |
2353 | In all cases, set a breakpoint at the current address | |
2354 | (where the handler returns to), and once that breakpoint | |
2355 | is hit, resume skipping the permanent breakpoint. If | |
2356 | that breakpoint isn't hit, then we've stepped into the | |
2357 | signal handler (or hit some other event). We'll delete | |
2358 | the step-resume breakpoint then. */ | |
2359 | ||
edbcda09 SM |
2360 | infrun_log_debug ("resume: skipping permanent breakpoint, " |
2361 | "deliver signal first"); | |
af48d08f PA |
2362 | |
2363 | clear_step_over_info (); | |
2364 | tp->control.trap_expected = 0; | |
2365 | ||
2366 | if (tp->control.step_resume_breakpoint == NULL) | |
2367 | { | |
2368 | /* Set a "high-priority" step-resume, as we don't want | |
2369 | user breakpoints at PC to trigger (again) when this | |
2370 | hits. */ | |
2371 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2372 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2373 | ||
2374 | tp->step_after_step_resume_breakpoint = step; | |
2375 | } | |
2376 | ||
2377 | insert_breakpoints (); | |
2378 | } | |
2379 | else | |
2380 | { | |
2381 | /* There's no signal to pass, we can go ahead and skip the | |
2382 | permanent breakpoint manually. */ | |
edbcda09 | 2383 | infrun_log_debug ("skipping permanent breakpoint"); |
af48d08f PA |
2384 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); |
2385 | /* Update pc to reflect the new address from which we will | |
2386 | execute instructions. */ | |
2387 | pc = regcache_read_pc (regcache); | |
2388 | ||
2389 | if (step) | |
2390 | { | |
2391 | /* We've already advanced the PC, so the stepping part | |
2392 | is done. Now we need to arrange for a trap to be | |
2393 | reported to handle_inferior_event. Set a breakpoint | |
2394 | at the current PC, and run to it. Don't update | |
2395 | prev_pc, because if we end in | |
44a1ee51 PA |
2396 | switch_back_to_stepped_thread, we want the "expected |
2397 | thread advanced also" branch to be taken. IOW, we | |
2398 | don't want this thread to step further from PC | |
af48d08f | 2399 | (overstep). */ |
1ac806b8 | 2400 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2401 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2402 | insert_breakpoints (); | |
2403 | ||
fbea99ea | 2404 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2405 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
719546c4 | 2406 | tp->resumed = true; |
af48d08f PA |
2407 | return; |
2408 | } | |
2409 | } | |
6d350bb5 | 2410 | } |
c2c6d25f | 2411 | |
c1e36e3e PA |
2412 | /* If we have a breakpoint to step over, make sure to do a single |
2413 | step only. Same if we have software watchpoints. */ | |
2414 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2415 | tp->control.may_range_step = 0; | |
2416 | ||
7da6a5b9 LM |
2417 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2418 | copy of the instruction at a different address. | |
237fc4c9 PA |
2419 | |
2420 | We can't use displaced stepping when we have a signal to deliver; | |
2421 | the comments for displaced_step_prepare explain why. The | |
2422 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2423 | signals' explain what we do instead. |
2424 | ||
2425 | We can't use displaced stepping when we are waiting for vfork_done | |
2426 | event, displaced stepping breaks the vfork child similarly as single | |
2427 | step software breakpoint. */ | |
3fc8eb30 PA |
2428 | if (tp->control.trap_expected |
2429 | && use_displaced_stepping (tp) | |
cb71640d | 2430 | && !step_over_info_valid_p () |
a493e3e2 | 2431 | && sig == GDB_SIGNAL_0 |
74609e71 | 2432 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2433 | { |
9844051a SM |
2434 | displaced_step_prepare_status prepare_status |
2435 | = displaced_step_prepare (tp); | |
fc1cf338 | 2436 | |
9844051a | 2437 | if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
d56b7306 | 2438 | { |
edbcda09 | 2439 | infrun_log_debug ("Got placed in step-over queue"); |
4d9d9d04 PA |
2440 | |
2441 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2442 | return; |
2443 | } | |
9844051a | 2444 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_ERROR) |
3fc8eb30 PA |
2445 | { |
2446 | /* Fallback to stepping over the breakpoint in-line. */ | |
2447 | ||
2448 | if (target_is_non_stop_p ()) | |
2449 | stop_all_threads (); | |
2450 | ||
a01bda52 | 2451 | set_step_over_info (regcache->aspace (), |
21edc42f | 2452 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2453 | |
2454 | step = maybe_software_singlestep (gdbarch, pc); | |
2455 | ||
2456 | insert_breakpoints (); | |
2457 | } | |
9844051a | 2458 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_OK) |
3fc8eb30 | 2459 | { |
9844051a | 2460 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, NULL); |
3fc8eb30 | 2461 | } |
9844051a SM |
2462 | else |
2463 | gdb_assert_not_reached ("invalid displaced_step_prepare_status value"); | |
237fc4c9 PA |
2464 | } |
2465 | ||
2facfe5c | 2466 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2467 | else if (step) |
2facfe5c | 2468 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2469 | |
30852783 UW |
2470 | /* Currently, our software single-step implementation leads to different |
2471 | results than hardware single-stepping in one situation: when stepping | |
2472 | into delivering a signal which has an associated signal handler, | |
2473 | hardware single-step will stop at the first instruction of the handler, | |
2474 | while software single-step will simply skip execution of the handler. | |
2475 | ||
2476 | For now, this difference in behavior is accepted since there is no | |
2477 | easy way to actually implement single-stepping into a signal handler | |
2478 | without kernel support. | |
2479 | ||
2480 | However, there is one scenario where this difference leads to follow-on | |
2481 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2482 | and then single-stepping. In this case, the software single-step | |
2483 | behavior means that even if there is a *breakpoint* in the signal | |
2484 | handler, GDB still would not stop. | |
2485 | ||
2486 | Fortunately, we can at least fix this particular issue. We detect | |
2487 | here the case where we are about to deliver a signal while software | |
2488 | single-stepping with breakpoints removed. In this situation, we | |
2489 | revert the decisions to remove all breakpoints and insert single- | |
2490 | step breakpoints, and instead we install a step-resume breakpoint | |
2491 | at the current address, deliver the signal without stepping, and | |
2492 | once we arrive back at the step-resume breakpoint, actually step | |
2493 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2494 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2495 | && sig != GDB_SIGNAL_0 |
2496 | && step_over_info_valid_p ()) | |
30852783 UW |
2497 | { |
2498 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2499 | immediately after a handler returns, might already have |
30852783 UW |
2500 | a step-resume breakpoint set on the earlier handler. We cannot |
2501 | set another step-resume breakpoint; just continue on until the | |
2502 | original breakpoint is hit. */ | |
2503 | if (tp->control.step_resume_breakpoint == NULL) | |
2504 | { | |
2c03e5be | 2505 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2506 | tp->step_after_step_resume_breakpoint = 1; |
2507 | } | |
2508 | ||
34b7e8a6 | 2509 | delete_single_step_breakpoints (tp); |
30852783 | 2510 | |
31e77af2 | 2511 | clear_step_over_info (); |
30852783 | 2512 | tp->control.trap_expected = 0; |
31e77af2 PA |
2513 | |
2514 | insert_breakpoints (); | |
30852783 UW |
2515 | } |
2516 | ||
b0f16a3e SM |
2517 | /* If STEP is set, it's a request to use hardware stepping |
2518 | facilities. But in that case, we should never | |
2519 | use singlestep breakpoint. */ | |
34b7e8a6 | 2520 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2521 | |
fbea99ea | 2522 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2523 | if (tp->control.trap_expected) |
b0f16a3e SM |
2524 | { |
2525 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2526 | hit, either by single-stepping the thread with the breakpoint |
2527 | removed, or by displaced stepping, with the breakpoint inserted. | |
2528 | In the former case, we need to single-step only this thread, | |
2529 | and keep others stopped, as they can miss this breakpoint if | |
2530 | allowed to run. That's not really a problem for displaced | |
2531 | stepping, but, we still keep other threads stopped, in case | |
2532 | another thread is also stopped for a breakpoint waiting for | |
2533 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2534 | resume_ptid = inferior_ptid; |
2535 | } | |
fbea99ea PA |
2536 | else |
2537 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2538 | |
7f5ef605 PA |
2539 | if (execution_direction != EXEC_REVERSE |
2540 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2541 | { |
372316f1 PA |
2542 | /* There are two cases where we currently need to step a |
2543 | breakpoint instruction when we have a signal to deliver: | |
2544 | ||
2545 | - See handle_signal_stop where we handle random signals that | |
2546 | could take out us out of the stepping range. Normally, in | |
2547 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2548 | signal handler with a breakpoint at PC, but there are cases |
2549 | where we should _always_ single-step, even if we have a | |
2550 | step-resume breakpoint, like when a software watchpoint is | |
2551 | set. Assuming single-stepping and delivering a signal at the | |
2552 | same time would takes us to the signal handler, then we could | |
2553 | have removed the breakpoint at PC to step over it. However, | |
2554 | some hardware step targets (like e.g., Mac OS) can't step | |
2555 | into signal handlers, and for those, we need to leave the | |
2556 | breakpoint at PC inserted, as otherwise if the handler | |
2557 | recurses and executes PC again, it'll miss the breakpoint. | |
2558 | So we leave the breakpoint inserted anyway, but we need to | |
2559 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2560 | that adjust_pc_after_break doesn't end up confused. |
2561 | ||
2562 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2563 | in one thread after another thread that was stepping had been | |
2564 | momentarily paused for a step-over. When we re-resume the | |
2565 | stepping thread, it may be resumed from that address with a | |
2566 | breakpoint that hasn't trapped yet. Seen with | |
2567 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2568 | do displaced stepping. */ | |
2569 | ||
edbcda09 SM |
2570 | infrun_log_debug ("resume: [%s] stepped breakpoint", |
2571 | target_pid_to_str (tp->ptid).c_str ()); | |
7f5ef605 PA |
2572 | |
2573 | tp->stepped_breakpoint = 1; | |
2574 | ||
b0f16a3e SM |
2575 | /* Most targets can step a breakpoint instruction, thus |
2576 | executing it normally. But if this one cannot, just | |
2577 | continue and we will hit it anyway. */ | |
7f5ef605 | 2578 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2579 | step = 0; |
2580 | } | |
ef5cf84e | 2581 | |
b0f16a3e | 2582 | if (debug_displaced |
cb71640d | 2583 | && tp->control.trap_expected |
3fc8eb30 | 2584 | && use_displaced_stepping (tp) |
cb71640d | 2585 | && !step_over_info_valid_p ()) |
b0f16a3e | 2586 | { |
00431a78 | 2587 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2588 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2589 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2590 | gdb_byte buf[4]; | |
2591 | ||
2592 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2593 | paddress (resume_gdbarch, actual_pc)); | |
2594 | read_memory (actual_pc, buf, sizeof (buf)); | |
2595 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2596 | } | |
237fc4c9 | 2597 | |
b0f16a3e SM |
2598 | if (tp->control.may_range_step) |
2599 | { | |
2600 | /* If we're resuming a thread with the PC out of the step | |
2601 | range, then we're doing some nested/finer run control | |
2602 | operation, like stepping the thread out of the dynamic | |
2603 | linker or the displaced stepping scratch pad. We | |
2604 | shouldn't have allowed a range step then. */ | |
2605 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2606 | } | |
c1e36e3e | 2607 | |
64ce06e4 | 2608 | do_target_resume (resume_ptid, step, sig); |
719546c4 | 2609 | tp->resumed = true; |
c906108c | 2610 | } |
71d378ae PA |
2611 | |
2612 | /* Resume the inferior. SIG is the signal to give the inferior | |
2613 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2614 | rolls back state on error. */ | |
2615 | ||
aff4e175 | 2616 | static void |
71d378ae PA |
2617 | resume (gdb_signal sig) |
2618 | { | |
a70b8144 | 2619 | try |
71d378ae PA |
2620 | { |
2621 | resume_1 (sig); | |
2622 | } | |
230d2906 | 2623 | catch (const gdb_exception &ex) |
71d378ae PA |
2624 | { |
2625 | /* If resuming is being aborted for any reason, delete any | |
2626 | single-step breakpoint resume_1 may have created, to avoid | |
2627 | confusing the following resumption, and to avoid leaving | |
2628 | single-step breakpoints perturbing other threads, in case | |
2629 | we're running in non-stop mode. */ | |
2630 | if (inferior_ptid != null_ptid) | |
2631 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2632 | throw; |
71d378ae | 2633 | } |
71d378ae PA |
2634 | } |
2635 | ||
c906108c | 2636 | \f |
237fc4c9 | 2637 | /* Proceeding. */ |
c906108c | 2638 | |
4c2f2a79 PA |
2639 | /* See infrun.h. */ |
2640 | ||
2641 | /* Counter that tracks number of user visible stops. This can be used | |
2642 | to tell whether a command has proceeded the inferior past the | |
2643 | current location. This allows e.g., inferior function calls in | |
2644 | breakpoint commands to not interrupt the command list. When the | |
2645 | call finishes successfully, the inferior is standing at the same | |
2646 | breakpoint as if nothing happened (and so we don't call | |
2647 | normal_stop). */ | |
2648 | static ULONGEST current_stop_id; | |
2649 | ||
2650 | /* See infrun.h. */ | |
2651 | ||
2652 | ULONGEST | |
2653 | get_stop_id (void) | |
2654 | { | |
2655 | return current_stop_id; | |
2656 | } | |
2657 | ||
2658 | /* Called when we report a user visible stop. */ | |
2659 | ||
2660 | static void | |
2661 | new_stop_id (void) | |
2662 | { | |
2663 | current_stop_id++; | |
2664 | } | |
2665 | ||
c906108c SS |
2666 | /* Clear out all variables saying what to do when inferior is continued. |
2667 | First do this, then set the ones you want, then call `proceed'. */ | |
2668 | ||
a7212384 UW |
2669 | static void |
2670 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2671 | { |
edbcda09 | 2672 | infrun_log_debug ("%s", target_pid_to_str (tp->ptid).c_str ()); |
d6b48e9c | 2673 | |
372316f1 PA |
2674 | /* If we're starting a new sequence, then the previous finished |
2675 | single-step is no longer relevant. */ | |
2676 | if (tp->suspend.waitstatus_pending_p) | |
2677 | { | |
2678 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2679 | { | |
edbcda09 SM |
2680 | infrun_log_debug ("pending event of %s was a finished step. " |
2681 | "Discarding.", | |
2682 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2683 | |
2684 | tp->suspend.waitstatus_pending_p = 0; | |
2685 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2686 | } | |
edbcda09 | 2687 | else |
372316f1 | 2688 | { |
edbcda09 SM |
2689 | infrun_log_debug |
2690 | ("thread %s has pending wait status %s (currently_stepping=%d).", | |
2691 | target_pid_to_str (tp->ptid).c_str (), | |
2692 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2693 | currently_stepping (tp)); | |
372316f1 PA |
2694 | } |
2695 | } | |
2696 | ||
70509625 PA |
2697 | /* If this signal should not be seen by program, give it zero. |
2698 | Used for debugging signals. */ | |
2699 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2700 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2701 | ||
46e3ed7f | 2702 | delete tp->thread_fsm; |
243a9253 PA |
2703 | tp->thread_fsm = NULL; |
2704 | ||
16c381f0 JK |
2705 | tp->control.trap_expected = 0; |
2706 | tp->control.step_range_start = 0; | |
2707 | tp->control.step_range_end = 0; | |
c1e36e3e | 2708 | tp->control.may_range_step = 0; |
16c381f0 JK |
2709 | tp->control.step_frame_id = null_frame_id; |
2710 | tp->control.step_stack_frame_id = null_frame_id; | |
2711 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2712 | tp->control.step_start_function = NULL; |
a7212384 | 2713 | tp->stop_requested = 0; |
4e1c45ea | 2714 | |
16c381f0 | 2715 | tp->control.stop_step = 0; |
32400beb | 2716 | |
16c381f0 | 2717 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2718 | |
856e7dd6 | 2719 | tp->control.stepping_command = 0; |
17b2616c | 2720 | |
a7212384 | 2721 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2722 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2723 | } |
32400beb | 2724 | |
a7212384 | 2725 | void |
70509625 | 2726 | clear_proceed_status (int step) |
a7212384 | 2727 | { |
f2665db5 MM |
2728 | /* With scheduler-locking replay, stop replaying other threads if we're |
2729 | not replaying the user-visible resume ptid. | |
2730 | ||
2731 | This is a convenience feature to not require the user to explicitly | |
2732 | stop replaying the other threads. We're assuming that the user's | |
2733 | intent is to resume tracing the recorded process. */ | |
2734 | if (!non_stop && scheduler_mode == schedlock_replay | |
2735 | && target_record_is_replaying (minus_one_ptid) | |
2736 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2737 | execution_direction)) | |
2738 | target_record_stop_replaying (); | |
2739 | ||
08036331 | 2740 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2741 | { |
08036331 | 2742 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2743 | process_stratum_target *resume_target |
2744 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2745 | |
2746 | /* In all-stop mode, delete the per-thread status of all threads | |
2747 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2748 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2749 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2750 | } |
2751 | ||
d7e15655 | 2752 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2753 | { |
2754 | struct inferior *inferior; | |
2755 | ||
2756 | if (non_stop) | |
2757 | { | |
6c95b8df PA |
2758 | /* If in non-stop mode, only delete the per-thread status of |
2759 | the current thread. */ | |
a7212384 UW |
2760 | clear_proceed_status_thread (inferior_thread ()); |
2761 | } | |
6c95b8df | 2762 | |
d6b48e9c | 2763 | inferior = current_inferior (); |
16c381f0 | 2764 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2765 | } |
2766 | ||
76727919 | 2767 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2768 | } |
2769 | ||
99619bea PA |
2770 | /* Returns true if TP is still stopped at a breakpoint that needs |
2771 | stepping-over in order to make progress. If the breakpoint is gone | |
2772 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2773 | |
2774 | static int | |
6c4cfb24 | 2775 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2776 | { |
2777 | if (tp->stepping_over_breakpoint) | |
2778 | { | |
00431a78 | 2779 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2780 | |
a01bda52 | 2781 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2782 | regcache_read_pc (regcache)) |
2783 | == ordinary_breakpoint_here) | |
99619bea PA |
2784 | return 1; |
2785 | ||
2786 | tp->stepping_over_breakpoint = 0; | |
2787 | } | |
2788 | ||
2789 | return 0; | |
2790 | } | |
2791 | ||
6c4cfb24 PA |
2792 | /* Check whether thread TP still needs to start a step-over in order |
2793 | to make progress when resumed. Returns an bitwise or of enum | |
2794 | step_over_what bits, indicating what needs to be stepped over. */ | |
2795 | ||
8d297bbf | 2796 | static step_over_what |
6c4cfb24 PA |
2797 | thread_still_needs_step_over (struct thread_info *tp) |
2798 | { | |
8d297bbf | 2799 | step_over_what what = 0; |
6c4cfb24 PA |
2800 | |
2801 | if (thread_still_needs_step_over_bp (tp)) | |
2802 | what |= STEP_OVER_BREAKPOINT; | |
2803 | ||
2804 | if (tp->stepping_over_watchpoint | |
2805 | && !target_have_steppable_watchpoint) | |
2806 | what |= STEP_OVER_WATCHPOINT; | |
2807 | ||
2808 | return what; | |
2809 | } | |
2810 | ||
483805cf PA |
2811 | /* Returns true if scheduler locking applies. STEP indicates whether |
2812 | we're about to do a step/next-like command to a thread. */ | |
2813 | ||
2814 | static int | |
856e7dd6 | 2815 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2816 | { |
2817 | return (scheduler_mode == schedlock_on | |
2818 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2819 | && tp->control.stepping_command) |
2820 | || (scheduler_mode == schedlock_replay | |
2821 | && target_record_will_replay (minus_one_ptid, | |
2822 | execution_direction))); | |
483805cf PA |
2823 | } |
2824 | ||
5b6d1e4f PA |
2825 | /* Calls target_commit_resume on all targets. */ |
2826 | ||
2827 | static void | |
2828 | commit_resume_all_targets () | |
2829 | { | |
2830 | scoped_restore_current_thread restore_thread; | |
2831 | ||
2832 | /* Map between process_target and a representative inferior. This | |
2833 | is to avoid committing a resume in the same target more than | |
2834 | once. Resumptions must be idempotent, so this is an | |
2835 | optimization. */ | |
2836 | std::unordered_map<process_stratum_target *, inferior *> conn_inf; | |
2837 | ||
2838 | for (inferior *inf : all_non_exited_inferiors ()) | |
2839 | if (inf->has_execution ()) | |
2840 | conn_inf[inf->process_target ()] = inf; | |
2841 | ||
2842 | for (const auto &ci : conn_inf) | |
2843 | { | |
2844 | inferior *inf = ci.second; | |
2845 | switch_to_inferior_no_thread (inf); | |
2846 | target_commit_resume (); | |
2847 | } | |
2848 | } | |
2849 | ||
2f4fcf00 PA |
2850 | /* Check that all the targets we're about to resume are in non-stop |
2851 | mode. Ideally, we'd only care whether all targets support | |
2852 | target-async, but we're not there yet. E.g., stop_all_threads | |
2853 | doesn't know how to handle all-stop targets. Also, the remote | |
2854 | protocol in all-stop mode is synchronous, irrespective of | |
2855 | target-async, which means that things like a breakpoint re-set | |
2856 | triggered by one target would try to read memory from all targets | |
2857 | and fail. */ | |
2858 | ||
2859 | static void | |
2860 | check_multi_target_resumption (process_stratum_target *resume_target) | |
2861 | { | |
2862 | if (!non_stop && resume_target == nullptr) | |
2863 | { | |
2864 | scoped_restore_current_thread restore_thread; | |
2865 | ||
2866 | /* This is used to track whether we're resuming more than one | |
2867 | target. */ | |
2868 | process_stratum_target *first_connection = nullptr; | |
2869 | ||
2870 | /* The first inferior we see with a target that does not work in | |
2871 | always-non-stop mode. */ | |
2872 | inferior *first_not_non_stop = nullptr; | |
2873 | ||
2874 | for (inferior *inf : all_non_exited_inferiors (resume_target)) | |
2875 | { | |
2876 | switch_to_inferior_no_thread (inf); | |
2877 | ||
2878 | if (!target_has_execution) | |
2879 | continue; | |
2880 | ||
2881 | process_stratum_target *proc_target | |
2882 | = current_inferior ()->process_target(); | |
2883 | ||
2884 | if (!target_is_non_stop_p ()) | |
2885 | first_not_non_stop = inf; | |
2886 | ||
2887 | if (first_connection == nullptr) | |
2888 | first_connection = proc_target; | |
2889 | else if (first_connection != proc_target | |
2890 | && first_not_non_stop != nullptr) | |
2891 | { | |
2892 | switch_to_inferior_no_thread (first_not_non_stop); | |
2893 | ||
2894 | proc_target = current_inferior ()->process_target(); | |
2895 | ||
2896 | error (_("Connection %d (%s) does not support " | |
2897 | "multi-target resumption."), | |
2898 | proc_target->connection_number, | |
2899 | make_target_connection_string (proc_target).c_str ()); | |
2900 | } | |
2901 | } | |
2902 | } | |
2903 | } | |
2904 | ||
c906108c SS |
2905 | /* Basic routine for continuing the program in various fashions. |
2906 | ||
2907 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
2908 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
2909 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
2910 | |
2911 | You should call clear_proceed_status before calling proceed. */ | |
2912 | ||
2913 | void | |
64ce06e4 | 2914 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2915 | { |
e58b0e63 PA |
2916 | struct regcache *regcache; |
2917 | struct gdbarch *gdbarch; | |
e58b0e63 | 2918 | CORE_ADDR pc; |
4d9d9d04 PA |
2919 | struct execution_control_state ecss; |
2920 | struct execution_control_state *ecs = &ecss; | |
4d9d9d04 | 2921 | int started; |
c906108c | 2922 | |
e58b0e63 PA |
2923 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2924 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2925 | resuming the current thread. */ | |
2926 | if (!follow_fork ()) | |
2927 | { | |
2928 | /* The target for some reason decided not to resume. */ | |
2929 | normal_stop (); | |
f148b27e | 2930 | if (target_can_async_p ()) |
b1a35af2 | 2931 | inferior_event_handler (INF_EXEC_COMPLETE); |
e58b0e63 PA |
2932 | return; |
2933 | } | |
2934 | ||
842951eb PA |
2935 | /* We'll update this if & when we switch to a new thread. */ |
2936 | previous_inferior_ptid = inferior_ptid; | |
2937 | ||
e58b0e63 | 2938 | regcache = get_current_regcache (); |
ac7936df | 2939 | gdbarch = regcache->arch (); |
8b86c959 YQ |
2940 | const address_space *aspace = regcache->aspace (); |
2941 | ||
fc75c28b TBA |
2942 | pc = regcache_read_pc_protected (regcache); |
2943 | ||
08036331 | 2944 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 2945 | |
99619bea | 2946 | /* Fill in with reasonable starting values. */ |
08036331 | 2947 | init_thread_stepping_state (cur_thr); |
99619bea | 2948 | |
08036331 | 2949 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 2950 | |
5b6d1e4f PA |
2951 | ptid_t resume_ptid |
2952 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
2953 | process_stratum_target *resume_target | |
2954 | = user_visible_resume_target (resume_ptid); | |
2955 | ||
2f4fcf00 PA |
2956 | check_multi_target_resumption (resume_target); |
2957 | ||
2acceee2 | 2958 | if (addr == (CORE_ADDR) -1) |
c906108c | 2959 | { |
08036331 | 2960 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 2961 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 2962 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2963 | /* There is a breakpoint at the address we will resume at, |
2964 | step one instruction before inserting breakpoints so that | |
2965 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2966 | breakpoint). |
2967 | ||
2968 | Note, we don't do this in reverse, because we won't | |
2969 | actually be executing the breakpoint insn anyway. | |
2970 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 2971 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
2972 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2973 | && gdbarch_single_step_through_delay (gdbarch, | |
2974 | get_current_frame ())) | |
3352ef37 AC |
2975 | /* We stepped onto an instruction that needs to be stepped |
2976 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 2977 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
2978 | } |
2979 | else | |
2980 | { | |
515630c5 | 2981 | regcache_write_pc (regcache, addr); |
c906108c SS |
2982 | } |
2983 | ||
70509625 | 2984 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 2985 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 2986 | |
4d9d9d04 PA |
2987 | /* If an exception is thrown from this point on, make sure to |
2988 | propagate GDB's knowledge of the executing state to the | |
2989 | frontend/user running state. */ | |
5b6d1e4f | 2990 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
2991 | |
2992 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
2993 | threads (e.g., we might need to set threads stepping over | |
2994 | breakpoints first), from the user/frontend's point of view, all | |
2995 | threads in RESUME_PTID are now running. Unless we're calling an | |
2996 | inferior function, as in that case we pretend the inferior | |
2997 | doesn't run at all. */ | |
08036331 | 2998 | if (!cur_thr->control.in_infcall) |
719546c4 | 2999 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3000 | |
edbcda09 SM |
3001 | infrun_log_debug ("addr=%s, signal=%s", paddress (gdbarch, addr), |
3002 | gdb_signal_to_symbol_string (siggnal)); | |
527159b7 | 3003 | |
4d9d9d04 PA |
3004 | annotate_starting (); |
3005 | ||
3006 | /* Make sure that output from GDB appears before output from the | |
3007 | inferior. */ | |
3008 | gdb_flush (gdb_stdout); | |
3009 | ||
d930703d PA |
3010 | /* Since we've marked the inferior running, give it the terminal. A |
3011 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3012 | still detect attempts to unblock a stuck connection with repeated | |
3013 | Ctrl-C from within target_pass_ctrlc). */ | |
3014 | target_terminal::inferior (); | |
3015 | ||
4d9d9d04 PA |
3016 | /* In a multi-threaded task we may select another thread and |
3017 | then continue or step. | |
3018 | ||
3019 | But if a thread that we're resuming had stopped at a breakpoint, | |
3020 | it will immediately cause another breakpoint stop without any | |
3021 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3022 | we must step over it first. | |
3023 | ||
3024 | Look for threads other than the current (TP) that reported a | |
3025 | breakpoint hit and haven't been resumed yet since. */ | |
3026 | ||
3027 | /* If scheduler locking applies, we can avoid iterating over all | |
3028 | threads. */ | |
08036331 | 3029 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3030 | { |
5b6d1e4f PA |
3031 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3032 | resume_ptid)) | |
08036331 | 3033 | { |
f3f8ece4 PA |
3034 | switch_to_thread_no_regs (tp); |
3035 | ||
4d9d9d04 PA |
3036 | /* Ignore the current thread here. It's handled |
3037 | afterwards. */ | |
08036331 | 3038 | if (tp == cur_thr) |
4d9d9d04 | 3039 | continue; |
c906108c | 3040 | |
4d9d9d04 PA |
3041 | if (!thread_still_needs_step_over (tp)) |
3042 | continue; | |
3043 | ||
3044 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3045 | |
edbcda09 SM |
3046 | infrun_log_debug ("need to step-over [%s] first", |
3047 | target_pid_to_str (tp->ptid).c_str ()); | |
99619bea | 3048 | |
7bd43605 | 3049 | global_thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3050 | } |
f3f8ece4 PA |
3051 | |
3052 | switch_to_thread (cur_thr); | |
30852783 UW |
3053 | } |
3054 | ||
4d9d9d04 PA |
3055 | /* Enqueue the current thread last, so that we move all other |
3056 | threads over their breakpoints first. */ | |
08036331 | 3057 | if (cur_thr->stepping_over_breakpoint) |
7bd43605 | 3058 | global_thread_step_over_chain_enqueue (cur_thr); |
30852783 | 3059 | |
4d9d9d04 PA |
3060 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3061 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3062 | advanced. Must do this before resuming any thread, as in | |
3063 | all-stop/remote, once we resume we can't send any other packet | |
3064 | until the target stops again. */ | |
fc75c28b | 3065 | cur_thr->prev_pc = regcache_read_pc_protected (regcache); |
99619bea | 3066 | |
a9bc57b9 TT |
3067 | { |
3068 | scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume (); | |
85ad3aaf | 3069 | |
a9bc57b9 | 3070 | started = start_step_over (); |
c906108c | 3071 | |
a9bc57b9 TT |
3072 | if (step_over_info_valid_p ()) |
3073 | { | |
3074 | /* Either this thread started a new in-line step over, or some | |
3075 | other thread was already doing one. In either case, don't | |
3076 | resume anything else until the step-over is finished. */ | |
3077 | } | |
3078 | else if (started && !target_is_non_stop_p ()) | |
3079 | { | |
3080 | /* A new displaced stepping sequence was started. In all-stop, | |
3081 | we can't talk to the target anymore until it next stops. */ | |
3082 | } | |
3083 | else if (!non_stop && target_is_non_stop_p ()) | |
3084 | { | |
3085 | /* In all-stop, but the target is always in non-stop mode. | |
3086 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3087 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3088 | resume_ptid)) | |
3089 | { | |
3090 | switch_to_thread_no_regs (tp); | |
3091 | ||
f9fac3c8 SM |
3092 | if (!tp->inf->has_execution ()) |
3093 | { | |
edbcda09 SM |
3094 | infrun_log_debug ("[%s] target has no execution", |
3095 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3096 | continue; |
3097 | } | |
f3f8ece4 | 3098 | |
f9fac3c8 SM |
3099 | if (tp->resumed) |
3100 | { | |
edbcda09 SM |
3101 | infrun_log_debug ("[%s] resumed", |
3102 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3103 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
3104 | continue; | |
3105 | } | |
fbea99ea | 3106 | |
f9fac3c8 SM |
3107 | if (thread_is_in_step_over_chain (tp)) |
3108 | { | |
edbcda09 SM |
3109 | infrun_log_debug ("[%s] needs step-over", |
3110 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3111 | continue; |
3112 | } | |
fbea99ea | 3113 | |
edbcda09 SM |
3114 | infrun_log_debug ("resuming %s", |
3115 | target_pid_to_str (tp->ptid).c_str ()); | |
fbea99ea | 3116 | |
f9fac3c8 SM |
3117 | reset_ecs (ecs, tp); |
3118 | switch_to_thread (tp); | |
3119 | keep_going_pass_signal (ecs); | |
3120 | if (!ecs->wait_some_more) | |
3121 | error (_("Command aborted.")); | |
3122 | } | |
a9bc57b9 | 3123 | } |
08036331 | 3124 | else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3125 | { |
3126 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3127 | reset_ecs (ecs, cur_thr); |
3128 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3129 | keep_going_pass_signal (ecs); |
3130 | if (!ecs->wait_some_more) | |
3131 | error (_("Command aborted.")); | |
3132 | } | |
3133 | } | |
c906108c | 3134 | |
5b6d1e4f | 3135 | commit_resume_all_targets (); |
85ad3aaf | 3136 | |
731f534f | 3137 | finish_state.release (); |
c906108c | 3138 | |
873657b9 PA |
3139 | /* If we've switched threads above, switch back to the previously |
3140 | current thread. We don't want the user to see a different | |
3141 | selected thread. */ | |
3142 | switch_to_thread (cur_thr); | |
3143 | ||
0b333c5e PA |
3144 | /* Tell the event loop to wait for it to stop. If the target |
3145 | supports asynchronous execution, it'll do this from within | |
3146 | target_resume. */ | |
362646f5 | 3147 | if (!target_can_async_p ()) |
0b333c5e | 3148 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3149 | } |
c906108c SS |
3150 | \f |
3151 | ||
3152 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3153 | |
c906108c | 3154 | void |
8621d6a9 | 3155 | start_remote (int from_tty) |
c906108c | 3156 | { |
5b6d1e4f PA |
3157 | inferior *inf = current_inferior (); |
3158 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3159 | |
1777feb0 | 3160 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3161 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3162 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3163 | nothing is returned (instead of just blocking). Because of this, |
3164 | targets expecting an immediate response need to, internally, set | |
3165 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3166 | timeout. */ |
6426a772 JM |
3167 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3168 | differentiate to its caller what the state of the target is after | |
3169 | the initial open has been performed. Here we're assuming that | |
3170 | the target has stopped. It should be possible to eventually have | |
3171 | target_open() return to the caller an indication that the target | |
3172 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3173 | for an async run. */ |
5b6d1e4f | 3174 | wait_for_inferior (inf); |
8621d6a9 DJ |
3175 | |
3176 | /* Now that the inferior has stopped, do any bookkeeping like | |
3177 | loading shared libraries. We want to do this before normal_stop, | |
3178 | so that the displayed frame is up to date. */ | |
8b88a78e | 3179 | post_create_inferior (current_top_target (), from_tty); |
8621d6a9 | 3180 | |
6426a772 | 3181 | normal_stop (); |
c906108c SS |
3182 | } |
3183 | ||
3184 | /* Initialize static vars when a new inferior begins. */ | |
3185 | ||
3186 | void | |
96baa820 | 3187 | init_wait_for_inferior (void) |
c906108c SS |
3188 | { |
3189 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3190 | |
c906108c SS |
3191 | breakpoint_init_inferior (inf_starting); |
3192 | ||
70509625 | 3193 | clear_proceed_status (0); |
9f976b41 | 3194 | |
ab1ddbcf | 3195 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3196 | |
842951eb | 3197 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3198 | } |
237fc4c9 | 3199 | |
c906108c | 3200 | \f |
488f131b | 3201 | |
ec9499be | 3202 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3203 | |
568d6575 UW |
3204 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3205 | struct execution_control_state *ecs); | |
3206 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3207 | struct execution_control_state *ecs); | |
4f5d7f63 | 3208 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3209 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3210 | struct frame_info *); |
611c83ae | 3211 | |
bdc36728 | 3212 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3213 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3214 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3215 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3216 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3217 | |
252fbfc8 PA |
3218 | /* This function is attached as a "thread_stop_requested" observer. |
3219 | Cleanup local state that assumed the PTID was to be resumed, and | |
3220 | report the stop to the frontend. */ | |
3221 | ||
2c0b251b | 3222 | static void |
252fbfc8 PA |
3223 | infrun_thread_stop_requested (ptid_t ptid) |
3224 | { | |
5b6d1e4f PA |
3225 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3226 | ||
c65d6b55 PA |
3227 | /* PTID was requested to stop. If the thread was already stopped, |
3228 | but the user/frontend doesn't know about that yet (e.g., the | |
3229 | thread had been temporarily paused for some step-over), set up | |
3230 | for reporting the stop now. */ | |
5b6d1e4f | 3231 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3232 | { |
3233 | if (tp->state != THREAD_RUNNING) | |
3234 | continue; | |
3235 | if (tp->executing) | |
3236 | continue; | |
c65d6b55 | 3237 | |
08036331 PA |
3238 | /* Remove matching threads from the step-over queue, so |
3239 | start_step_over doesn't try to resume them | |
3240 | automatically. */ | |
3241 | if (thread_is_in_step_over_chain (tp)) | |
7bd43605 | 3242 | global_thread_step_over_chain_remove (tp); |
c65d6b55 | 3243 | |
08036331 PA |
3244 | /* If the thread is stopped, but the user/frontend doesn't |
3245 | know about that yet, queue a pending event, as if the | |
3246 | thread had just stopped now. Unless the thread already had | |
3247 | a pending event. */ | |
3248 | if (!tp->suspend.waitstatus_pending_p) | |
3249 | { | |
3250 | tp->suspend.waitstatus_pending_p = 1; | |
3251 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3252 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3253 | } | |
c65d6b55 | 3254 | |
08036331 PA |
3255 | /* Clear the inline-frame state, since we're re-processing the |
3256 | stop. */ | |
5b6d1e4f | 3257 | clear_inline_frame_state (tp); |
c65d6b55 | 3258 | |
08036331 PA |
3259 | /* If this thread was paused because some other thread was |
3260 | doing an inline-step over, let that finish first. Once | |
3261 | that happens, we'll restart all threads and consume pending | |
3262 | stop events then. */ | |
3263 | if (step_over_info_valid_p ()) | |
3264 | continue; | |
3265 | ||
3266 | /* Otherwise we can process the (new) pending event now. Set | |
3267 | it so this pending event is considered by | |
3268 | do_target_wait. */ | |
719546c4 | 3269 | tp->resumed = true; |
08036331 | 3270 | } |
252fbfc8 PA |
3271 | } |
3272 | ||
a07daef3 PA |
3273 | static void |
3274 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3275 | { | |
5b6d1e4f PA |
3276 | if (target_last_proc_target == tp->inf->process_target () |
3277 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3278 | nullify_last_target_wait_ptid (); |
3279 | } | |
3280 | ||
0cbcdb96 PA |
3281 | /* Delete the step resume, single-step and longjmp/exception resume |
3282 | breakpoints of TP. */ | |
4e1c45ea | 3283 | |
0cbcdb96 PA |
3284 | static void |
3285 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3286 | { |
0cbcdb96 PA |
3287 | delete_step_resume_breakpoint (tp); |
3288 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3289 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3290 | } |
3291 | ||
0cbcdb96 PA |
3292 | /* If the target still has execution, call FUNC for each thread that |
3293 | just stopped. In all-stop, that's all the non-exited threads; in | |
3294 | non-stop, that's the current thread, only. */ | |
3295 | ||
3296 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3297 | (struct thread_info *tp); | |
4e1c45ea PA |
3298 | |
3299 | static void | |
0cbcdb96 | 3300 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3301 | { |
d7e15655 | 3302 | if (!target_has_execution || inferior_ptid == null_ptid) |
4e1c45ea PA |
3303 | return; |
3304 | ||
fbea99ea | 3305 | if (target_is_non_stop_p ()) |
4e1c45ea | 3306 | { |
0cbcdb96 PA |
3307 | /* If in non-stop mode, only the current thread stopped. */ |
3308 | func (inferior_thread ()); | |
4e1c45ea PA |
3309 | } |
3310 | else | |
0cbcdb96 | 3311 | { |
0cbcdb96 | 3312 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3313 | for (thread_info *tp : all_non_exited_threads ()) |
3314 | func (tp); | |
0cbcdb96 PA |
3315 | } |
3316 | } | |
3317 | ||
3318 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3319 | the threads that just stopped. */ | |
3320 | ||
3321 | static void | |
3322 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3323 | { | |
3324 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3325 | } |
3326 | ||
3327 | /* Delete the single-step breakpoints of the threads that just | |
3328 | stopped. */ | |
7c16b83e | 3329 | |
34b7e8a6 PA |
3330 | static void |
3331 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3332 | { | |
3333 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3334 | } |
3335 | ||
221e1a37 | 3336 | /* See infrun.h. */ |
223698f8 | 3337 | |
221e1a37 | 3338 | void |
223698f8 DE |
3339 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3340 | const struct target_waitstatus *ws) | |
3341 | { | |
23fdd69e | 3342 | std::string status_string = target_waitstatus_to_string (ws); |
d7e74731 | 3343 | string_file stb; |
223698f8 DE |
3344 | |
3345 | /* The text is split over several lines because it was getting too long. | |
3346 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3347 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3348 | is set. */ | |
3349 | ||
d7e74731 | 3350 | stb.printf ("infrun: target_wait (%d.%ld.%ld", |
e99b03dc | 3351 | waiton_ptid.pid (), |
e38504b3 | 3352 | waiton_ptid.lwp (), |
cc6bcb54 | 3353 | waiton_ptid.tid ()); |
e99b03dc | 3354 | if (waiton_ptid.pid () != -1) |
a068643d | 3355 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid).c_str ()); |
d7e74731 PA |
3356 | stb.printf (", status) =\n"); |
3357 | stb.printf ("infrun: %d.%ld.%ld [%s],\n", | |
e99b03dc | 3358 | result_ptid.pid (), |
e38504b3 | 3359 | result_ptid.lwp (), |
cc6bcb54 | 3360 | result_ptid.tid (), |
a068643d | 3361 | target_pid_to_str (result_ptid).c_str ()); |
23fdd69e | 3362 | stb.printf ("infrun: %s\n", status_string.c_str ()); |
223698f8 DE |
3363 | |
3364 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3365 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3366 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3367 | } |
3368 | ||
372316f1 PA |
3369 | /* Select a thread at random, out of those which are resumed and have |
3370 | had events. */ | |
3371 | ||
3372 | static struct thread_info * | |
5b6d1e4f | 3373 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3374 | { |
372316f1 | 3375 | int num_events = 0; |
08036331 | 3376 | |
5b6d1e4f | 3377 | auto has_event = [&] (thread_info *tp) |
08036331 | 3378 | { |
5b6d1e4f PA |
3379 | return (tp->ptid.matches (waiton_ptid) |
3380 | && tp->resumed | |
08036331 PA |
3381 | && tp->suspend.waitstatus_pending_p); |
3382 | }; | |
372316f1 PA |
3383 | |
3384 | /* First see how many events we have. Count only resumed threads | |
3385 | that have an event pending. */ | |
5b6d1e4f | 3386 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3387 | if (has_event (tp)) |
372316f1 PA |
3388 | num_events++; |
3389 | ||
3390 | if (num_events == 0) | |
3391 | return NULL; | |
3392 | ||
3393 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3394 | int random_selector = (int) ((num_events * (double) rand ()) |
3395 | / (RAND_MAX + 1.0)); | |
372316f1 | 3396 | |
edbcda09 SM |
3397 | if (num_events > 1) |
3398 | infrun_log_debug ("Found %d events, selecting #%d", | |
3399 | num_events, random_selector); | |
372316f1 PA |
3400 | |
3401 | /* Select the Nth thread that has had an event. */ | |
5b6d1e4f | 3402 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3403 | if (has_event (tp)) |
372316f1 | 3404 | if (random_selector-- == 0) |
08036331 | 3405 | return tp; |
372316f1 | 3406 | |
08036331 | 3407 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3408 | } |
3409 | ||
3410 | /* Wrapper for target_wait that first checks whether threads have | |
3411 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3412 | more events. INF is the inferior we're using to call target_wait |
3413 | on. */ | |
372316f1 PA |
3414 | |
3415 | static ptid_t | |
5b6d1e4f PA |
3416 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
3417 | target_waitstatus *status, int options) | |
372316f1 PA |
3418 | { |
3419 | ptid_t event_ptid; | |
3420 | struct thread_info *tp; | |
3421 | ||
24ed6739 AB |
3422 | /* We know that we are looking for an event in the target of inferior |
3423 | INF, but we don't know which thread the event might come from. As | |
3424 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3425 | the wait code relies on it - doing so is always a mistake. */ | |
3426 | switch_to_inferior_no_thread (inf); | |
3427 | ||
372316f1 PA |
3428 | /* First check if there is a resumed thread with a wait status |
3429 | pending. */ | |
d7e15655 | 3430 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3431 | { |
5b6d1e4f | 3432 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3433 | } |
3434 | else | |
3435 | { | |
edbcda09 SM |
3436 | infrun_log_debug ("Waiting for specific thread %s.", |
3437 | target_pid_to_str (ptid).c_str ()); | |
372316f1 PA |
3438 | |
3439 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3440 | tp = find_thread_ptid (inf, ptid); |
372316f1 PA |
3441 | gdb_assert (tp != NULL); |
3442 | if (!tp->suspend.waitstatus_pending_p) | |
3443 | tp = NULL; | |
3444 | } | |
3445 | ||
3446 | if (tp != NULL | |
3447 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3448 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3449 | { | |
00431a78 | 3450 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3451 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3452 | CORE_ADDR pc; |
3453 | int discard = 0; | |
3454 | ||
3455 | pc = regcache_read_pc (regcache); | |
3456 | ||
3457 | if (pc != tp->suspend.stop_pc) | |
3458 | { | |
edbcda09 SM |
3459 | infrun_log_debug ("PC of %s changed. was=%s, now=%s", |
3460 | target_pid_to_str (tp->ptid).c_str (), | |
3461 | paddress (gdbarch, tp->suspend.stop_pc), | |
3462 | paddress (gdbarch, pc)); | |
372316f1 PA |
3463 | discard = 1; |
3464 | } | |
a01bda52 | 3465 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 | 3466 | { |
edbcda09 SM |
3467 | infrun_log_debug ("previous breakpoint of %s, at %s gone", |
3468 | target_pid_to_str (tp->ptid).c_str (), | |
3469 | paddress (gdbarch, pc)); | |
372316f1 PA |
3470 | |
3471 | discard = 1; | |
3472 | } | |
3473 | ||
3474 | if (discard) | |
3475 | { | |
edbcda09 SM |
3476 | infrun_log_debug ("pending event of %s cancelled.", |
3477 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3478 | |
3479 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3480 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3481 | } | |
3482 | } | |
3483 | ||
3484 | if (tp != NULL) | |
3485 | { | |
edbcda09 SM |
3486 | infrun_log_debug ("Using pending wait status %s for %s.", |
3487 | target_waitstatus_to_string | |
3488 | (&tp->suspend.waitstatus).c_str (), | |
3489 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3490 | |
3491 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3492 | if it was a software breakpoint (and the target doesn't | |
3493 | always adjust the PC itself). */ | |
3494 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3495 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3496 | { | |
3497 | struct regcache *regcache; | |
3498 | struct gdbarch *gdbarch; | |
3499 | int decr_pc; | |
3500 | ||
00431a78 | 3501 | regcache = get_thread_regcache (tp); |
ac7936df | 3502 | gdbarch = regcache->arch (); |
372316f1 PA |
3503 | |
3504 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3505 | if (decr_pc != 0) | |
3506 | { | |
3507 | CORE_ADDR pc; | |
3508 | ||
3509 | pc = regcache_read_pc (regcache); | |
3510 | regcache_write_pc (regcache, pc + decr_pc); | |
3511 | } | |
3512 | } | |
3513 | ||
3514 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3515 | *status = tp->suspend.waitstatus; | |
3516 | tp->suspend.waitstatus_pending_p = 0; | |
3517 | ||
3518 | /* Wake up the event loop again, until all pending events are | |
3519 | processed. */ | |
3520 | if (target_is_async_p ()) | |
3521 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3522 | return tp->ptid; | |
3523 | } | |
3524 | ||
3525 | /* But if we don't find one, we'll have to wait. */ | |
3526 | ||
3527 | if (deprecated_target_wait_hook) | |
3528 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3529 | else | |
3530 | event_ptid = target_wait (ptid, status, options); | |
3531 | ||
3532 | return event_ptid; | |
3533 | } | |
3534 | ||
5b6d1e4f PA |
3535 | /* Wrapper for target_wait that first checks whether threads have |
3536 | pending statuses to report before actually asking the target for | |
cad90433 | 3537 | more events. Polls for events from all inferiors/targets. */ |
5b6d1e4f PA |
3538 | |
3539 | static bool | |
3540 | do_target_wait (ptid_t wait_ptid, execution_control_state *ecs, int options) | |
3541 | { | |
3542 | int num_inferiors = 0; | |
3543 | int random_selector; | |
3544 | ||
cad90433 SM |
3545 | /* For fairness, we pick the first inferior/target to poll at random |
3546 | out of all inferiors that may report events, and then continue | |
3547 | polling the rest of the inferior list starting from that one in a | |
3548 | circular fashion until the whole list is polled once. */ | |
5b6d1e4f PA |
3549 | |
3550 | auto inferior_matches = [&wait_ptid] (inferior *inf) | |
3551 | { | |
3552 | return (inf->process_target () != NULL | |
5b6d1e4f PA |
3553 | && ptid_t (inf->pid).matches (wait_ptid)); |
3554 | }; | |
3555 | ||
cad90433 | 3556 | /* First see how many matching inferiors we have. */ |
5b6d1e4f PA |
3557 | for (inferior *inf : all_inferiors ()) |
3558 | if (inferior_matches (inf)) | |
3559 | num_inferiors++; | |
3560 | ||
3561 | if (num_inferiors == 0) | |
3562 | { | |
3563 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3564 | return false; | |
3565 | } | |
3566 | ||
cad90433 | 3567 | /* Now randomly pick an inferior out of those that matched. */ |
5b6d1e4f PA |
3568 | random_selector = (int) |
3569 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3570 | ||
edbcda09 SM |
3571 | if (num_inferiors > 1) |
3572 | infrun_log_debug ("Found %d inferiors, starting at #%d", | |
3573 | num_inferiors, random_selector); | |
5b6d1e4f | 3574 | |
cad90433 | 3575 | /* Select the Nth inferior that matched. */ |
5b6d1e4f PA |
3576 | |
3577 | inferior *selected = nullptr; | |
3578 | ||
3579 | for (inferior *inf : all_inferiors ()) | |
3580 | if (inferior_matches (inf)) | |
3581 | if (random_selector-- == 0) | |
3582 | { | |
3583 | selected = inf; | |
3584 | break; | |
3585 | } | |
3586 | ||
cad90433 | 3587 | /* Now poll for events out of each of the matching inferior's |
5b6d1e4f PA |
3588 | targets, starting from the selected one. */ |
3589 | ||
3590 | auto do_wait = [&] (inferior *inf) | |
3591 | { | |
5b6d1e4f PA |
3592 | ecs->ptid = do_target_wait_1 (inf, wait_ptid, &ecs->ws, options); |
3593 | ecs->target = inf->process_target (); | |
3594 | return (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3595 | }; | |
3596 | ||
cad90433 SM |
3597 | /* Needed in 'all-stop + target-non-stop' mode, because we end up |
3598 | here spuriously after the target is all stopped and we've already | |
5b6d1e4f PA |
3599 | reported the stop to the user, polling for events. */ |
3600 | scoped_restore_current_thread restore_thread; | |
3601 | ||
3602 | int inf_num = selected->num; | |
3603 | for (inferior *inf = selected; inf != NULL; inf = inf->next) | |
3604 | if (inferior_matches (inf)) | |
3605 | if (do_wait (inf)) | |
3606 | return true; | |
3607 | ||
3608 | for (inferior *inf = inferior_list; | |
3609 | inf != NULL && inf->num < inf_num; | |
3610 | inf = inf->next) | |
3611 | if (inferior_matches (inf)) | |
3612 | if (do_wait (inf)) | |
3613 | return true; | |
3614 | ||
3615 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3616 | return false; | |
3617 | } | |
3618 | ||
24291992 PA |
3619 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3620 | detaching while a thread is displaced stepping is a recipe for | |
3621 | crashing it, as nothing would readjust the PC out of the scratch | |
3622 | pad. */ | |
3623 | ||
3624 | void | |
3625 | prepare_for_detach (void) | |
3626 | { | |
3627 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3628 | ptid_t pid_ptid = ptid_t (inf->pid); |
24291992 | 3629 | |
9844051a | 3630 | // displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf); |
24291992 PA |
3631 | |
3632 | /* Is any thread of this process displaced stepping? If not, | |
3633 | there's nothing else to do. */ | |
9844051a | 3634 | if (displaced_step_in_progress (inf)) |
24291992 PA |
3635 | return; |
3636 | ||
edbcda09 | 3637 | infrun_log_debug ("displaced-stepping in-process while detaching"); |
24291992 | 3638 | |
9bcb1f16 | 3639 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3640 | |
9844051a SM |
3641 | // FIXME |
3642 | while (false) | |
24291992 | 3643 | { |
24291992 PA |
3644 | struct execution_control_state ecss; |
3645 | struct execution_control_state *ecs; | |
3646 | ||
3647 | ecs = &ecss; | |
3648 | memset (ecs, 0, sizeof (*ecs)); | |
3649 | ||
3650 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3651 | /* Flush target cache before starting to handle each event. |
3652 | Target was running and cache could be stale. This is just a | |
3653 | heuristic. Running threads may modify target memory, but we | |
3654 | don't get any event. */ | |
3655 | target_dcache_invalidate (); | |
24291992 | 3656 | |
5b6d1e4f | 3657 | do_target_wait (pid_ptid, ecs, 0); |
24291992 PA |
3658 | |
3659 | if (debug_infrun) | |
3660 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3661 | ||
3662 | /* If an error happens while handling the event, propagate GDB's | |
3663 | knowledge of the executing state to the frontend/user running | |
3664 | state. */ | |
5b6d1e4f PA |
3665 | scoped_finish_thread_state finish_state (inf->process_target (), |
3666 | minus_one_ptid); | |
24291992 PA |
3667 | |
3668 | /* Now figure out what to do with the result of the result. */ | |
3669 | handle_inferior_event (ecs); | |
3670 | ||
3671 | /* No error, don't finish the state yet. */ | |
731f534f | 3672 | finish_state.release (); |
24291992 PA |
3673 | |
3674 | /* Breakpoints and watchpoints are not installed on the target | |
3675 | at this point, and signals are passed directly to the | |
3676 | inferior, so this must mean the process is gone. */ | |
3677 | if (!ecs->wait_some_more) | |
3678 | { | |
9bcb1f16 | 3679 | restore_detaching.release (); |
24291992 PA |
3680 | error (_("Program exited while detaching")); |
3681 | } | |
3682 | } | |
3683 | ||
9bcb1f16 | 3684 | restore_detaching.release (); |
24291992 PA |
3685 | } |
3686 | ||
cd0fc7c3 | 3687 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3688 | |
cd0fc7c3 SS |
3689 | If inferior gets a signal, we may decide to start it up again |
3690 | instead of returning. That is why there is a loop in this function. | |
3691 | When this function actually returns it means the inferior | |
3692 | should be left stopped and GDB should read more commands. */ | |
3693 | ||
5b6d1e4f PA |
3694 | static void |
3695 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3696 | { |
edbcda09 | 3697 | infrun_log_debug ("wait_for_inferior ()"); |
527159b7 | 3698 | |
4c41382a | 3699 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3700 | |
e6f5c25b PA |
3701 | /* If an error happens while handling the event, propagate GDB's |
3702 | knowledge of the executing state to the frontend/user running | |
3703 | state. */ | |
5b6d1e4f PA |
3704 | scoped_finish_thread_state finish_state |
3705 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 3706 | |
c906108c SS |
3707 | while (1) |
3708 | { | |
ae25568b PA |
3709 | struct execution_control_state ecss; |
3710 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 3711 | |
ae25568b PA |
3712 | memset (ecs, 0, sizeof (*ecs)); |
3713 | ||
ec9499be | 3714 | overlay_cache_invalid = 1; |
ec9499be | 3715 | |
f15cb84a YQ |
3716 | /* Flush target cache before starting to handle each event. |
3717 | Target was running and cache could be stale. This is just a | |
3718 | heuristic. Running threads may modify target memory, but we | |
3719 | don't get any event. */ | |
3720 | target_dcache_invalidate (); | |
3721 | ||
5b6d1e4f PA |
3722 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
3723 | ecs->target = inf->process_target (); | |
c906108c | 3724 | |
f00150c9 | 3725 | if (debug_infrun) |
5b6d1e4f | 3726 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3727 | |
cd0fc7c3 SS |
3728 | /* Now figure out what to do with the result of the result. */ |
3729 | handle_inferior_event (ecs); | |
c906108c | 3730 | |
cd0fc7c3 SS |
3731 | if (!ecs->wait_some_more) |
3732 | break; | |
3733 | } | |
4e1c45ea | 3734 | |
e6f5c25b | 3735 | /* No error, don't finish the state yet. */ |
731f534f | 3736 | finish_state.release (); |
cd0fc7c3 | 3737 | } |
c906108c | 3738 | |
d3d4baed PA |
3739 | /* Cleanup that reinstalls the readline callback handler, if the |
3740 | target is running in the background. If while handling the target | |
3741 | event something triggered a secondary prompt, like e.g., a | |
3742 | pagination prompt, we'll have removed the callback handler (see | |
3743 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3744 | event loop, ready to process further input. Note this has no | |
3745 | effect if the handler hasn't actually been removed, because calling | |
3746 | rl_callback_handler_install resets the line buffer, thus losing | |
3747 | input. */ | |
3748 | ||
3749 | static void | |
d238133d | 3750 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 3751 | { |
3b12939d PA |
3752 | struct ui *ui = current_ui; |
3753 | ||
3754 | if (!ui->async) | |
6c400b59 PA |
3755 | { |
3756 | /* We're not going back to the top level event loop yet. Don't | |
3757 | install the readline callback, as it'd prep the terminal, | |
3758 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3759 | it the next time the prompt is displayed, when we're ready | |
3760 | for input. */ | |
3761 | return; | |
3762 | } | |
3763 | ||
3b12939d | 3764 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3765 | gdb_rl_callback_handler_reinstall (); |
3766 | } | |
3767 | ||
243a9253 PA |
3768 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3769 | that's just the event thread. In all-stop, that's all threads. */ | |
3770 | ||
3771 | static void | |
3772 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3773 | { | |
08036331 PA |
3774 | if (ecs->event_thread != NULL |
3775 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 3776 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
3777 | |
3778 | if (!non_stop) | |
3779 | { | |
08036331 | 3780 | for (thread_info *thr : all_non_exited_threads ()) |
243a9253 PA |
3781 | { |
3782 | if (thr->thread_fsm == NULL) | |
3783 | continue; | |
3784 | if (thr == ecs->event_thread) | |
3785 | continue; | |
3786 | ||
00431a78 | 3787 | switch_to_thread (thr); |
46e3ed7f | 3788 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
3789 | } |
3790 | ||
3791 | if (ecs->event_thread != NULL) | |
00431a78 | 3792 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3793 | } |
3794 | } | |
3795 | ||
3b12939d PA |
3796 | /* Helper for all_uis_check_sync_execution_done that works on the |
3797 | current UI. */ | |
3798 | ||
3799 | static void | |
3800 | check_curr_ui_sync_execution_done (void) | |
3801 | { | |
3802 | struct ui *ui = current_ui; | |
3803 | ||
3804 | if (ui->prompt_state == PROMPT_NEEDED | |
3805 | && ui->async | |
3806 | && !gdb_in_secondary_prompt_p (ui)) | |
3807 | { | |
223ffa71 | 3808 | target_terminal::ours (); |
76727919 | 3809 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3810 | ui_register_input_event_handler (ui); |
3b12939d PA |
3811 | } |
3812 | } | |
3813 | ||
3814 | /* See infrun.h. */ | |
3815 | ||
3816 | void | |
3817 | all_uis_check_sync_execution_done (void) | |
3818 | { | |
0e454242 | 3819 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3820 | { |
3821 | check_curr_ui_sync_execution_done (); | |
3822 | } | |
3823 | } | |
3824 | ||
a8836c93 PA |
3825 | /* See infrun.h. */ |
3826 | ||
3827 | void | |
3828 | all_uis_on_sync_execution_starting (void) | |
3829 | { | |
0e454242 | 3830 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3831 | { |
3832 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3833 | async_disable_stdin (); | |
3834 | } | |
3835 | } | |
3836 | ||
1777feb0 | 3837 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3838 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3839 | descriptor corresponding to the target. It can be called more than |
3840 | once to complete a single execution command. In such cases we need | |
3841 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3842 | that this function is called for a single execution command, then |
3843 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3844 | necessary cleanups. */ |
43ff13b4 JM |
3845 | |
3846 | void | |
b1a35af2 | 3847 | fetch_inferior_event () |
43ff13b4 | 3848 | { |
0d1e5fa7 | 3849 | struct execution_control_state ecss; |
a474d7c2 | 3850 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 3851 | int cmd_done = 0; |
43ff13b4 | 3852 | |
0d1e5fa7 PA |
3853 | memset (ecs, 0, sizeof (*ecs)); |
3854 | ||
c61db772 PA |
3855 | /* Events are always processed with the main UI as current UI. This |
3856 | way, warnings, debug output, etc. are always consistently sent to | |
3857 | the main console. */ | |
4b6749b9 | 3858 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3859 | |
d3d4baed | 3860 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
3861 | { |
3862 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
3863 | ||
3864 | /* We're handling a live event, so make sure we're doing live | |
3865 | debugging. If we're looking at traceframes while the target is | |
3866 | running, we're going to need to get back to that mode after | |
3867 | handling the event. */ | |
3868 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
3869 | if (non_stop) | |
3870 | { | |
3871 | maybe_restore_traceframe.emplace (); | |
3872 | set_current_traceframe (-1); | |
3873 | } | |
43ff13b4 | 3874 | |
873657b9 PA |
3875 | /* The user/frontend should not notice a thread switch due to |
3876 | internal events. Make sure we revert to the user selected | |
3877 | thread and frame after handling the event and running any | |
3878 | breakpoint commands. */ | |
3879 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
3880 | |
3881 | overlay_cache_invalid = 1; | |
3882 | /* Flush target cache before starting to handle each event. Target | |
3883 | was running and cache could be stale. This is just a heuristic. | |
3884 | Running threads may modify target memory, but we don't get any | |
3885 | event. */ | |
3886 | target_dcache_invalidate (); | |
3887 | ||
3888 | scoped_restore save_exec_dir | |
3889 | = make_scoped_restore (&execution_direction, | |
3890 | target_execution_direction ()); | |
3891 | ||
a33d4569 SM |
3892 | /* Hold the resume commands until we are done consuming all immediately |
3893 | available target events. */ | |
3894 | static gdb::optional<scoped_restore_tmpl<int>> restore_defer_commit_resume; | |
3895 | if (!restore_defer_commit_resume.has_value ()) | |
3896 | restore_defer_commit_resume.emplace (make_scoped_defer_target_commit_resume ()); | |
3897 | ||
5b6d1e4f | 3898 | if (!do_target_wait (minus_one_ptid, ecs, TARGET_WNOHANG)) |
0e342892 SM |
3899 | { |
3900 | infrun_log_debug ("do_target_wait returned false"); | |
a33d4569 SM |
3901 | |
3902 | /* No more events to process, let the resume commands free. */ | |
3903 | restore_defer_commit_resume.reset (); | |
3904 | commit_resume_all_targets(); | |
0e342892 SM |
3905 | return; |
3906 | } | |
3907 | ||
3908 | infrun_log_debug ("do_target_wait returned true"); | |
5b6d1e4f PA |
3909 | |
3910 | gdb_assert (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3911 | ||
3912 | /* Switch to the target that generated the event, so we can do | |
3913 | target calls. Any inferior bound to the target will do, so we | |
3914 | just switch to the first we find. */ | |
3915 | for (inferior *inf : all_inferiors (ecs->target)) | |
3916 | { | |
3917 | switch_to_inferior_no_thread (inf); | |
3918 | break; | |
3919 | } | |
d238133d TT |
3920 | |
3921 | if (debug_infrun) | |
5b6d1e4f | 3922 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
d238133d TT |
3923 | |
3924 | /* If an error happens while handling the event, propagate GDB's | |
3925 | knowledge of the executing state to the frontend/user running | |
3926 | state. */ | |
3927 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 3928 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 3929 | |
979a0d13 | 3930 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
3931 | still for the thread which has thrown the exception. */ |
3932 | auto defer_bpstat_clear | |
3933 | = make_scope_exit (bpstat_clear_actions); | |
3934 | auto defer_delete_threads | |
3935 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
3936 | ||
3937 | /* Now figure out what to do with the result of the result. */ | |
3938 | handle_inferior_event (ecs); | |
3939 | ||
3940 | if (!ecs->wait_some_more) | |
3941 | { | |
5b6d1e4f | 3942 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
d238133d TT |
3943 | int should_stop = 1; |
3944 | struct thread_info *thr = ecs->event_thread; | |
d6b48e9c | 3945 | |
d238133d | 3946 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3947 | |
d238133d TT |
3948 | if (thr != NULL) |
3949 | { | |
3950 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 3951 | |
d238133d | 3952 | if (thread_fsm != NULL) |
46e3ed7f | 3953 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 3954 | } |
243a9253 | 3955 | |
d238133d TT |
3956 | if (!should_stop) |
3957 | { | |
3958 | keep_going (ecs); | |
3959 | } | |
3960 | else | |
3961 | { | |
46e3ed7f | 3962 | bool should_notify_stop = true; |
d238133d | 3963 | int proceeded = 0; |
1840d81a | 3964 | |
d238133d | 3965 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 3966 | |
d238133d | 3967 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 3968 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 3969 | |
d238133d TT |
3970 | if (should_notify_stop) |
3971 | { | |
3972 | /* We may not find an inferior if this was a process exit. */ | |
3973 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
3974 | proceeded = normal_stop (); | |
3975 | } | |
243a9253 | 3976 | |
d238133d TT |
3977 | if (!proceeded) |
3978 | { | |
b1a35af2 | 3979 | inferior_event_handler (INF_EXEC_COMPLETE); |
d238133d TT |
3980 | cmd_done = 1; |
3981 | } | |
873657b9 PA |
3982 | |
3983 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
3984 | previously selected thread is gone. We have two | |
3985 | choices - switch to no thread selected, or restore the | |
3986 | previously selected thread (now exited). We chose the | |
3987 | later, just because that's what GDB used to do. After | |
3988 | this, "info threads" says "The current thread <Thread | |
3989 | ID 2> has terminated." instead of "No thread | |
3990 | selected.". */ | |
3991 | if (!non_stop | |
3992 | && cmd_done | |
3993 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
3994 | restore_thread.dont_restore (); | |
d238133d TT |
3995 | } |
3996 | } | |
4f8d22e3 | 3997 | |
d238133d TT |
3998 | defer_delete_threads.release (); |
3999 | defer_bpstat_clear.release (); | |
29f49a6a | 4000 | |
d238133d TT |
4001 | /* No error, don't finish the thread states yet. */ |
4002 | finish_state.release (); | |
731f534f | 4003 | |
a33d4569 SM |
4004 | mark_infrun_async_event_handler (); |
4005 | ||
d238133d TT |
4006 | /* This scope is used to ensure that readline callbacks are |
4007 | reinstalled here. */ | |
4008 | } | |
4f8d22e3 | 4009 | |
3b12939d PA |
4010 | /* If a UI was in sync execution mode, and now isn't, restore its |
4011 | prompt (a synchronous execution command has finished, and we're | |
4012 | ready for input). */ | |
4013 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4014 | |
4015 | if (cmd_done | |
0f641c01 | 4016 | && exec_done_display_p |
00431a78 PA |
4017 | && (inferior_ptid == null_ptid |
4018 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 4019 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
4020 | } |
4021 | ||
29734269 SM |
4022 | /* See infrun.h. */ |
4023 | ||
edb3359d | 4024 | void |
29734269 SM |
4025 | set_step_info (thread_info *tp, struct frame_info *frame, |
4026 | struct symtab_and_line sal) | |
edb3359d | 4027 | { |
29734269 SM |
4028 | /* This can be removed once this function no longer implicitly relies on the |
4029 | inferior_ptid value. */ | |
4030 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4031 | |
16c381f0 JK |
4032 | tp->control.step_frame_id = get_frame_id (frame); |
4033 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4034 | |
4035 | tp->current_symtab = sal.symtab; | |
4036 | tp->current_line = sal.line; | |
4037 | } | |
4038 | ||
0d1e5fa7 PA |
4039 | /* Clear context switchable stepping state. */ |
4040 | ||
4041 | void | |
4e1c45ea | 4042 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4043 | { |
7f5ef605 | 4044 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4045 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4046 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4047 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4048 | } |
4049 | ||
ab1ddbcf | 4050 | /* See infrun.h. */ |
c32c64b7 | 4051 | |
6efcd9a8 | 4052 | void |
5b6d1e4f PA |
4053 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
4054 | target_waitstatus status) | |
c32c64b7 | 4055 | { |
5b6d1e4f | 4056 | target_last_proc_target = target; |
c32c64b7 DE |
4057 | target_last_wait_ptid = ptid; |
4058 | target_last_waitstatus = status; | |
4059 | } | |
4060 | ||
ab1ddbcf | 4061 | /* See infrun.h. */ |
e02bc4cc DS |
4062 | |
4063 | void | |
5b6d1e4f PA |
4064 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4065 | target_waitstatus *status) | |
e02bc4cc | 4066 | { |
5b6d1e4f PA |
4067 | if (target != nullptr) |
4068 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4069 | if (ptid != nullptr) |
4070 | *ptid = target_last_wait_ptid; | |
4071 | if (status != nullptr) | |
4072 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4073 | } |
4074 | ||
ab1ddbcf PA |
4075 | /* See infrun.h. */ |
4076 | ||
ac264b3b MS |
4077 | void |
4078 | nullify_last_target_wait_ptid (void) | |
4079 | { | |
5b6d1e4f | 4080 | target_last_proc_target = nullptr; |
ac264b3b | 4081 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4082 | target_last_waitstatus = {}; |
ac264b3b MS |
4083 | } |
4084 | ||
dcf4fbde | 4085 | /* Switch thread contexts. */ |
dd80620e MS |
4086 | |
4087 | static void | |
00431a78 | 4088 | context_switch (execution_control_state *ecs) |
dd80620e | 4089 | { |
edbcda09 | 4090 | if (ecs->ptid != inferior_ptid |
5b6d1e4f PA |
4091 | && (inferior_ptid == null_ptid |
4092 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 | 4093 | { |
edbcda09 SM |
4094 | infrun_log_debug ("Switching context from %s to %s", |
4095 | target_pid_to_str (inferior_ptid).c_str (), | |
4096 | target_pid_to_str (ecs->ptid).c_str ()); | |
fd48f117 DJ |
4097 | } |
4098 | ||
00431a78 | 4099 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4100 | } |
4101 | ||
d8dd4d5f PA |
4102 | /* If the target can't tell whether we've hit breakpoints |
4103 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4104 | check whether that could have been caused by a breakpoint. If so, | |
4105 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4106 | ||
4fa8626c | 4107 | static void |
d8dd4d5f PA |
4108 | adjust_pc_after_break (struct thread_info *thread, |
4109 | struct target_waitstatus *ws) | |
4fa8626c | 4110 | { |
24a73cce UW |
4111 | struct regcache *regcache; |
4112 | struct gdbarch *gdbarch; | |
118e6252 | 4113 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4114 | |
4fa8626c DJ |
4115 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4116 | we aren't, just return. | |
9709f61c DJ |
4117 | |
4118 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4119 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4120 | implemented by software breakpoints should be handled through the normal | |
4121 | breakpoint layer. | |
8fb3e588 | 4122 | |
4fa8626c DJ |
4123 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4124 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4125 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4126 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4127 | generates these signals at breakpoints (the code has been in GDB since at | |
4128 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4129 | |
e6cf7916 UW |
4130 | In earlier versions of GDB, a target with |
4131 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4132 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4133 | target with both of these set in GDB history, and it seems unlikely to be | |
4134 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4135 | |
d8dd4d5f | 4136 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4137 | return; |
4138 | ||
d8dd4d5f | 4139 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4140 | return; |
4141 | ||
4058b839 PA |
4142 | /* In reverse execution, when a breakpoint is hit, the instruction |
4143 | under it has already been de-executed. The reported PC always | |
4144 | points at the breakpoint address, so adjusting it further would | |
4145 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4146 | architecture: | |
4147 | ||
4148 | B1 0x08000000 : INSN1 | |
4149 | B2 0x08000001 : INSN2 | |
4150 | 0x08000002 : INSN3 | |
4151 | PC -> 0x08000003 : INSN4 | |
4152 | ||
4153 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4154 | from that point should hit B2 as below. Reading the PC when the | |
4155 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4156 | been de-executed already. | |
4157 | ||
4158 | B1 0x08000000 : INSN1 | |
4159 | B2 PC -> 0x08000001 : INSN2 | |
4160 | 0x08000002 : INSN3 | |
4161 | 0x08000003 : INSN4 | |
4162 | ||
4163 | We can't apply the same logic as for forward execution, because | |
4164 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4165 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4166 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4167 | behaviour. */ | |
4168 | if (execution_direction == EXEC_REVERSE) | |
4169 | return; | |
4170 | ||
1cf4d951 PA |
4171 | /* If the target can tell whether the thread hit a SW breakpoint, |
4172 | trust it. Targets that can tell also adjust the PC | |
4173 | themselves. */ | |
4174 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4175 | return; | |
4176 | ||
4177 | /* Note that relying on whether a breakpoint is planted in memory to | |
4178 | determine this can fail. E.g,. the breakpoint could have been | |
4179 | removed since. Or the thread could have been told to step an | |
4180 | instruction the size of a breakpoint instruction, and only | |
4181 | _after_ was a breakpoint inserted at its address. */ | |
4182 | ||
24a73cce UW |
4183 | /* If this target does not decrement the PC after breakpoints, then |
4184 | we have nothing to do. */ | |
00431a78 | 4185 | regcache = get_thread_regcache (thread); |
ac7936df | 4186 | gdbarch = regcache->arch (); |
118e6252 | 4187 | |
527a273a | 4188 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4189 | if (decr_pc == 0) |
24a73cce UW |
4190 | return; |
4191 | ||
8b86c959 | 4192 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4193 | |
8aad930b AC |
4194 | /* Find the location where (if we've hit a breakpoint) the |
4195 | breakpoint would be. */ | |
118e6252 | 4196 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4197 | |
1cf4d951 PA |
4198 | /* If the target can't tell whether a software breakpoint triggered, |
4199 | fallback to figuring it out based on breakpoints we think were | |
4200 | inserted in the target, and on whether the thread was stepped or | |
4201 | continued. */ | |
4202 | ||
1c5cfe86 PA |
4203 | /* Check whether there actually is a software breakpoint inserted at |
4204 | that location. | |
4205 | ||
4206 | If in non-stop mode, a race condition is possible where we've | |
4207 | removed a breakpoint, but stop events for that breakpoint were | |
4208 | already queued and arrive later. To suppress those spurious | |
4209 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4210 | and retire them after a number of stop events are reported. Note |
4211 | this is an heuristic and can thus get confused. The real fix is | |
4212 | to get the "stopped by SW BP and needs adjustment" info out of | |
4213 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4214 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4215 | || (target_is_non_stop_p () |
4216 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4217 | { |
07036511 | 4218 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4219 | |
8213266a | 4220 | if (record_full_is_used ()) |
07036511 TT |
4221 | restore_operation_disable.emplace |
4222 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4223 | |
1c0fdd0e UW |
4224 | /* When using hardware single-step, a SIGTRAP is reported for both |
4225 | a completed single-step and a software breakpoint. Need to | |
4226 | differentiate between the two, as the latter needs adjusting | |
4227 | but the former does not. | |
4228 | ||
4229 | The SIGTRAP can be due to a completed hardware single-step only if | |
4230 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4231 | - this thread is currently being stepped |
4232 | ||
4233 | If any of these events did not occur, we must have stopped due | |
4234 | to hitting a software breakpoint, and have to back up to the | |
4235 | breakpoint address. | |
4236 | ||
4237 | As a special case, we could have hardware single-stepped a | |
4238 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4239 | we also need to back up to the breakpoint address. */ | |
4240 | ||
d8dd4d5f PA |
4241 | if (thread_has_single_step_breakpoints_set (thread) |
4242 | || !currently_stepping (thread) | |
4243 | || (thread->stepped_breakpoint | |
4244 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4245 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4246 | } |
4fa8626c DJ |
4247 | } |
4248 | ||
edb3359d DJ |
4249 | static int |
4250 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4251 | { | |
4252 | for (frame = get_prev_frame (frame); | |
4253 | frame != NULL; | |
4254 | frame = get_prev_frame (frame)) | |
4255 | { | |
4256 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4257 | return 1; | |
4258 | if (get_frame_type (frame) != INLINE_FRAME) | |
4259 | break; | |
4260 | } | |
4261 | ||
4262 | return 0; | |
4263 | } | |
4264 | ||
4a4c04f1 BE |
4265 | /* Look for an inline frame that is marked for skip. |
4266 | If PREV_FRAME is TRUE start at the previous frame, | |
4267 | otherwise start at the current frame. Stop at the | |
4268 | first non-inline frame, or at the frame where the | |
4269 | step started. */ | |
4270 | ||
4271 | static bool | |
4272 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4273 | { | |
4274 | struct frame_info *frame = get_current_frame (); | |
4275 | ||
4276 | if (prev_frame) | |
4277 | frame = get_prev_frame (frame); | |
4278 | ||
4279 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4280 | { | |
4281 | const char *fn = NULL; | |
4282 | symtab_and_line sal; | |
4283 | struct symbol *sym; | |
4284 | ||
4285 | if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id)) | |
4286 | break; | |
4287 | if (get_frame_type (frame) != INLINE_FRAME) | |
4288 | break; | |
4289 | ||
4290 | sal = find_frame_sal (frame); | |
4291 | sym = get_frame_function (frame); | |
4292 | ||
4293 | if (sym != NULL) | |
4294 | fn = sym->print_name (); | |
4295 | ||
4296 | if (sal.line != 0 | |
4297 | && function_name_is_marked_for_skip (fn, sal)) | |
4298 | return true; | |
4299 | } | |
4300 | ||
4301 | return false; | |
4302 | } | |
4303 | ||
c65d6b55 PA |
4304 | /* If the event thread has the stop requested flag set, pretend it |
4305 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4306 | target_stop). */ | |
4307 | ||
4308 | static bool | |
4309 | handle_stop_requested (struct execution_control_state *ecs) | |
4310 | { | |
4311 | if (ecs->event_thread->stop_requested) | |
4312 | { | |
4313 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4314 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4315 | handle_signal_stop (ecs); | |
4316 | return true; | |
4317 | } | |
4318 | return false; | |
4319 | } | |
4320 | ||
a96d9b2e SDJ |
4321 | /* Auxiliary function that handles syscall entry/return events. |
4322 | It returns 1 if the inferior should keep going (and GDB | |
4323 | should ignore the event), or 0 if the event deserves to be | |
4324 | processed. */ | |
ca2163eb | 4325 | |
a96d9b2e | 4326 | static int |
ca2163eb | 4327 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4328 | { |
ca2163eb | 4329 | struct regcache *regcache; |
ca2163eb PA |
4330 | int syscall_number; |
4331 | ||
00431a78 | 4332 | context_switch (ecs); |
ca2163eb | 4333 | |
00431a78 | 4334 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4335 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4336 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4337 | |
a96d9b2e SDJ |
4338 | if (catch_syscall_enabled () > 0 |
4339 | && catching_syscall_number (syscall_number) > 0) | |
4340 | { | |
edbcda09 | 4341 | infrun_log_debug ("syscall number=%d", syscall_number); |
a96d9b2e | 4342 | |
16c381f0 | 4343 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4344 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4345 | ecs->event_thread->suspend.stop_pc, |
4346 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4347 | |
c65d6b55 PA |
4348 | if (handle_stop_requested (ecs)) |
4349 | return 0; | |
4350 | ||
ce12b012 | 4351 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4352 | { |
4353 | /* Catchpoint hit. */ | |
ca2163eb PA |
4354 | return 0; |
4355 | } | |
a96d9b2e | 4356 | } |
ca2163eb | 4357 | |
c65d6b55 PA |
4358 | if (handle_stop_requested (ecs)) |
4359 | return 0; | |
4360 | ||
ca2163eb | 4361 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb PA |
4362 | keep_going (ecs); |
4363 | return 1; | |
a96d9b2e SDJ |
4364 | } |
4365 | ||
7e324e48 GB |
4366 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4367 | ||
4368 | static void | |
4369 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4370 | struct execution_control_state *ecs) | |
4371 | { | |
4372 | if (!ecs->stop_func_filled_in) | |
4373 | { | |
98a617f8 KB |
4374 | const block *block; |
4375 | ||
7e324e48 GB |
4376 | /* Don't care about return value; stop_func_start and stop_func_name |
4377 | will both be 0 if it doesn't work. */ | |
98a617f8 KB |
4378 | find_pc_partial_function (ecs->event_thread->suspend.stop_pc, |
4379 | &ecs->stop_func_name, | |
4380 | &ecs->stop_func_start, | |
4381 | &ecs->stop_func_end, | |
4382 | &block); | |
4383 | ||
4384 | /* The call to find_pc_partial_function, above, will set | |
4385 | stop_func_start and stop_func_end to the start and end | |
4386 | of the range containing the stop pc. If this range | |
4387 | contains the entry pc for the block (which is always the | |
4388 | case for contiguous blocks), advance stop_func_start past | |
4389 | the function's start offset and entrypoint. Note that | |
4390 | stop_func_start is NOT advanced when in a range of a | |
4391 | non-contiguous block that does not contain the entry pc. */ | |
4392 | if (block != nullptr | |
4393 | && ecs->stop_func_start <= BLOCK_ENTRY_PC (block) | |
4394 | && BLOCK_ENTRY_PC (block) < ecs->stop_func_end) | |
4395 | { | |
4396 | ecs->stop_func_start | |
4397 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4398 | ||
4399 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4400 | ecs->stop_func_start | |
4401 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4402 | } | |
591a12a1 | 4403 | |
7e324e48 GB |
4404 | ecs->stop_func_filled_in = 1; |
4405 | } | |
4406 | } | |
4407 | ||
4f5d7f63 | 4408 | |
00431a78 | 4409 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4410 | |
4411 | static enum stop_kind | |
00431a78 | 4412 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4413 | { |
5b6d1e4f | 4414 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4415 | |
4416 | gdb_assert (inf != NULL); | |
4417 | return inf->control.stop_soon; | |
4418 | } | |
4419 | ||
5b6d1e4f PA |
4420 | /* Poll for one event out of the current target. Store the resulting |
4421 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4422 | |
4423 | static ptid_t | |
5b6d1e4f | 4424 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4425 | { |
4426 | ptid_t event_ptid; | |
372316f1 PA |
4427 | |
4428 | overlay_cache_invalid = 1; | |
4429 | ||
4430 | /* Flush target cache before starting to handle each event. | |
4431 | Target was running and cache could be stale. This is just a | |
4432 | heuristic. Running threads may modify target memory, but we | |
4433 | don't get any event. */ | |
4434 | target_dcache_invalidate (); | |
4435 | ||
4436 | if (deprecated_target_wait_hook) | |
5b6d1e4f | 4437 | event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 | 4438 | else |
5b6d1e4f | 4439 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4440 | |
4441 | if (debug_infrun) | |
5b6d1e4f | 4442 | print_target_wait_results (minus_one_ptid, event_ptid, ws); |
372316f1 PA |
4443 | |
4444 | return event_ptid; | |
4445 | } | |
4446 | ||
5b6d1e4f PA |
4447 | /* An event reported by wait_one. */ |
4448 | ||
4449 | struct wait_one_event | |
4450 | { | |
4451 | /* The target the event came out of. */ | |
4452 | process_stratum_target *target; | |
4453 | ||
4454 | /* The PTID the event was for. */ | |
4455 | ptid_t ptid; | |
4456 | ||
4457 | /* The waitstatus. */ | |
4458 | target_waitstatus ws; | |
4459 | }; | |
4460 | ||
4461 | /* Wait for one event out of any target. */ | |
4462 | ||
4463 | static wait_one_event | |
4464 | wait_one () | |
4465 | { | |
4466 | while (1) | |
4467 | { | |
4468 | for (inferior *inf : all_inferiors ()) | |
4469 | { | |
4470 | process_stratum_target *target = inf->process_target (); | |
4471 | if (target == NULL | |
4472 | || !target->is_async_p () | |
4473 | || !target->threads_executing) | |
4474 | continue; | |
4475 | ||
4476 | switch_to_inferior_no_thread (inf); | |
4477 | ||
4478 | wait_one_event event; | |
4479 | event.target = target; | |
4480 | event.ptid = poll_one_curr_target (&event.ws); | |
4481 | ||
4482 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4483 | { | |
4484 | /* If nothing is resumed, remove the target from the | |
4485 | event loop. */ | |
4486 | target_async (0); | |
4487 | } | |
4488 | else if (event.ws.kind != TARGET_WAITKIND_IGNORE) | |
4489 | return event; | |
4490 | } | |
4491 | ||
4492 | /* Block waiting for some event. */ | |
4493 | ||
4494 | fd_set readfds; | |
4495 | int nfds = 0; | |
4496 | ||
4497 | FD_ZERO (&readfds); | |
4498 | ||
4499 | for (inferior *inf : all_inferiors ()) | |
4500 | { | |
4501 | process_stratum_target *target = inf->process_target (); | |
4502 | if (target == NULL | |
4503 | || !target->is_async_p () | |
4504 | || !target->threads_executing) | |
4505 | continue; | |
4506 | ||
4507 | int fd = target->async_wait_fd (); | |
4508 | FD_SET (fd, &readfds); | |
4509 | if (nfds <= fd) | |
4510 | nfds = fd + 1; | |
4511 | } | |
4512 | ||
4513 | if (nfds == 0) | |
4514 | { | |
4515 | /* No waitable targets left. All must be stopped. */ | |
4516 | return {NULL, minus_one_ptid, {TARGET_WAITKIND_NO_RESUMED}}; | |
4517 | } | |
4518 | ||
4519 | QUIT; | |
4520 | ||
4521 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4522 | if (numfds < 0) | |
4523 | { | |
4524 | if (errno == EINTR) | |
4525 | continue; | |
4526 | else | |
4527 | perror_with_name ("interruptible_select"); | |
4528 | } | |
4529 | } | |
4530 | } | |
4531 | ||
372316f1 PA |
4532 | /* Save the thread's event and stop reason to process it later. */ |
4533 | ||
4534 | static void | |
5b6d1e4f | 4535 | save_waitstatus (struct thread_info *tp, const target_waitstatus *ws) |
372316f1 | 4536 | { |
edbcda09 SM |
4537 | infrun_log_debug ("saving status %s for %d.%ld.%ld", |
4538 | target_waitstatus_to_string (ws).c_str (), | |
4539 | tp->ptid.pid (), | |
4540 | tp->ptid.lwp (), | |
4541 | tp->ptid.tid ()); | |
372316f1 PA |
4542 | |
4543 | /* Record for later. */ | |
4544 | tp->suspend.waitstatus = *ws; | |
4545 | tp->suspend.waitstatus_pending_p = 1; | |
4546 | ||
00431a78 | 4547 | struct regcache *regcache = get_thread_regcache (tp); |
8b86c959 | 4548 | const address_space *aspace = regcache->aspace (); |
372316f1 PA |
4549 | |
4550 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4551 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4552 | { | |
4553 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4554 | ||
4555 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4556 | ||
18493a00 PA |
4557 | scoped_restore_current_thread restore_thread; |
4558 | switch_to_thread (tp); | |
4559 | ||
4560 | if (target_stopped_by_watchpoint ()) | |
372316f1 PA |
4561 | { |
4562 | tp->suspend.stop_reason | |
4563 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4564 | } | |
4565 | else if (target_supports_stopped_by_sw_breakpoint () | |
18493a00 | 4566 | && target_stopped_by_sw_breakpoint ()) |
372316f1 PA |
4567 | { |
4568 | tp->suspend.stop_reason | |
4569 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4570 | } | |
4571 | else if (target_supports_stopped_by_hw_breakpoint () | |
18493a00 | 4572 | && target_stopped_by_hw_breakpoint ()) |
372316f1 PA |
4573 | { |
4574 | tp->suspend.stop_reason | |
4575 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4576 | } | |
4577 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4578 | && hardware_breakpoint_inserted_here_p (aspace, | |
4579 | pc)) | |
4580 | { | |
4581 | tp->suspend.stop_reason | |
4582 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4583 | } | |
4584 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4585 | && software_breakpoint_inserted_here_p (aspace, | |
4586 | pc)) | |
4587 | { | |
4588 | tp->suspend.stop_reason | |
4589 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4590 | } | |
4591 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4592 | && currently_stepping (tp)) | |
4593 | { | |
4594 | tp->suspend.stop_reason | |
4595 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4596 | } | |
4597 | } | |
4598 | } | |
4599 | ||
293b3ebc TBA |
4600 | /* Mark the non-executing threads accordingly. In all-stop, all |
4601 | threads of all processes are stopped when we get any event | |
4602 | reported. In non-stop mode, only the event thread stops. */ | |
4603 | ||
4604 | static void | |
4605 | mark_non_executing_threads (process_stratum_target *target, | |
4606 | ptid_t event_ptid, | |
4607 | struct target_waitstatus ws) | |
4608 | { | |
4609 | ptid_t mark_ptid; | |
4610 | ||
4611 | if (!target_is_non_stop_p ()) | |
4612 | mark_ptid = minus_one_ptid; | |
4613 | else if (ws.kind == TARGET_WAITKIND_SIGNALLED | |
4614 | || ws.kind == TARGET_WAITKIND_EXITED) | |
4615 | { | |
4616 | /* If we're handling a process exit in non-stop mode, even | |
4617 | though threads haven't been deleted yet, one would think | |
4618 | that there is nothing to do, as threads of the dead process | |
4619 | will be soon deleted, and threads of any other process were | |
4620 | left running. However, on some targets, threads survive a | |
4621 | process exit event. E.g., for the "checkpoint" command, | |
4622 | when the current checkpoint/fork exits, linux-fork.c | |
4623 | automatically switches to another fork from within | |
4624 | target_mourn_inferior, by associating the same | |
4625 | inferior/thread to another fork. We haven't mourned yet at | |
4626 | this point, but we must mark any threads left in the | |
4627 | process as not-executing so that finish_thread_state marks | |
4628 | them stopped (in the user's perspective) if/when we present | |
4629 | the stop to the user. */ | |
4630 | mark_ptid = ptid_t (event_ptid.pid ()); | |
4631 | } | |
4632 | else | |
4633 | mark_ptid = event_ptid; | |
4634 | ||
4635 | set_executing (target, mark_ptid, false); | |
4636 | ||
4637 | /* Likewise the resumed flag. */ | |
4638 | set_resumed (target, mark_ptid, false); | |
4639 | } | |
4640 | ||
6efcd9a8 | 4641 | /* See infrun.h. */ |
372316f1 | 4642 | |
6efcd9a8 | 4643 | void |
372316f1 PA |
4644 | stop_all_threads (void) |
4645 | { | |
4646 | /* We may need multiple passes to discover all threads. */ | |
4647 | int pass; | |
4648 | int iterations = 0; | |
372316f1 | 4649 | |
53cccef1 | 4650 | gdb_assert (exists_non_stop_target ()); |
372316f1 | 4651 | |
edbcda09 | 4652 | infrun_log_debug ("stop_all_threads"); |
372316f1 | 4653 | |
00431a78 | 4654 | scoped_restore_current_thread restore_thread; |
372316f1 | 4655 | |
6ad82919 TBA |
4656 | /* Enable thread events of all targets. */ |
4657 | for (auto *target : all_non_exited_process_targets ()) | |
4658 | { | |
4659 | switch_to_target_no_thread (target); | |
4660 | target_thread_events (true); | |
4661 | } | |
4662 | ||
4663 | SCOPE_EXIT | |
4664 | { | |
4665 | /* Disable thread events of all targets. */ | |
4666 | for (auto *target : all_non_exited_process_targets ()) | |
4667 | { | |
4668 | switch_to_target_no_thread (target); | |
4669 | target_thread_events (false); | |
4670 | } | |
4671 | ||
edbcda09 SM |
4672 | |
4673 | infrun_log_debug ("stop_all_threads done"); | |
6ad82919 | 4674 | }; |
65706a29 | 4675 | |
372316f1 PA |
4676 | /* Request threads to stop, and then wait for the stops. Because |
4677 | threads we already know about can spawn more threads while we're | |
4678 | trying to stop them, and we only learn about new threads when we | |
4679 | update the thread list, do this in a loop, and keep iterating | |
4680 | until two passes find no threads that need to be stopped. */ | |
4681 | for (pass = 0; pass < 2; pass++, iterations++) | |
4682 | { | |
edbcda09 SM |
4683 | infrun_log_debug ("stop_all_threads, pass=%d, iterations=%d", |
4684 | pass, iterations); | |
372316f1 PA |
4685 | while (1) |
4686 | { | |
29d6859f | 4687 | int waits_needed = 0; |
372316f1 | 4688 | |
a05575d3 TBA |
4689 | for (auto *target : all_non_exited_process_targets ()) |
4690 | { | |
4691 | switch_to_target_no_thread (target); | |
4692 | update_thread_list (); | |
4693 | } | |
372316f1 PA |
4694 | |
4695 | /* Go through all threads looking for threads that we need | |
4696 | to tell the target to stop. */ | |
08036331 | 4697 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 4698 | { |
53cccef1 TBA |
4699 | /* For a single-target setting with an all-stop target, |
4700 | we would not even arrive here. For a multi-target | |
4701 | setting, until GDB is able to handle a mixture of | |
4702 | all-stop and non-stop targets, simply skip all-stop | |
4703 | targets' threads. This should be fine due to the | |
4704 | protection of 'check_multi_target_resumption'. */ | |
4705 | ||
4706 | switch_to_thread_no_regs (t); | |
4707 | if (!target_is_non_stop_p ()) | |
4708 | continue; | |
4709 | ||
372316f1 PA |
4710 | if (t->executing) |
4711 | { | |
4712 | /* If already stopping, don't request a stop again. | |
4713 | We just haven't seen the notification yet. */ | |
4714 | if (!t->stop_requested) | |
4715 | { | |
edbcda09 SM |
4716 | infrun_log_debug (" %s executing, need stop", |
4717 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4718 | target_stop (t->ptid); |
4719 | t->stop_requested = 1; | |
4720 | } | |
4721 | else | |
4722 | { | |
edbcda09 SM |
4723 | infrun_log_debug (" %s executing, already stopping", |
4724 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4725 | } |
4726 | ||
4727 | if (t->stop_requested) | |
29d6859f | 4728 | waits_needed++; |
372316f1 PA |
4729 | } |
4730 | else | |
4731 | { | |
edbcda09 SM |
4732 | infrun_log_debug (" %s not executing", |
4733 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4734 | |
4735 | /* The thread may be not executing, but still be | |
4736 | resumed with a pending status to process. */ | |
719546c4 | 4737 | t->resumed = false; |
372316f1 PA |
4738 | } |
4739 | } | |
4740 | ||
29d6859f | 4741 | if (waits_needed == 0) |
372316f1 PA |
4742 | break; |
4743 | ||
4744 | /* If we find new threads on the second iteration, restart | |
4745 | over. We want to see two iterations in a row with all | |
4746 | threads stopped. */ | |
4747 | if (pass > 0) | |
4748 | pass = -1; | |
4749 | ||
29d6859f | 4750 | for (int i = 0; i < waits_needed; i++) |
c29705b7 | 4751 | { |
29d6859f | 4752 | wait_one_event event = wait_one (); |
a05575d3 | 4753 | |
edbcda09 SM |
4754 | infrun_log_debug ("%s %s\n", |
4755 | target_waitstatus_to_string (&event.ws).c_str (), | |
4756 | target_pid_to_str (event.ptid).c_str ()); | |
a05575d3 | 4757 | |
29d6859f | 4758 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) |
a05575d3 | 4759 | { |
29d6859f LM |
4760 | /* All resumed threads exited. */ |
4761 | break; | |
a05575d3 | 4762 | } |
29d6859f LM |
4763 | else if (event.ws.kind == TARGET_WAITKIND_THREAD_EXITED |
4764 | || event.ws.kind == TARGET_WAITKIND_EXITED | |
4765 | || event.ws.kind == TARGET_WAITKIND_SIGNALLED) | |
6efcd9a8 | 4766 | { |
29d6859f | 4767 | /* One thread/process exited/signalled. */ |
6efcd9a8 | 4768 | |
29d6859f | 4769 | thread_info *t = nullptr; |
372316f1 | 4770 | |
29d6859f LM |
4771 | /* The target may have reported just a pid. If so, try |
4772 | the first non-exited thread. */ | |
4773 | if (event.ptid.is_pid ()) | |
372316f1 | 4774 | { |
29d6859f LM |
4775 | int pid = event.ptid.pid (); |
4776 | inferior *inf = find_inferior_pid (event.target, pid); | |
4777 | for (thread_info *tp : inf->non_exited_threads ()) | |
372316f1 | 4778 | { |
29d6859f LM |
4779 | t = tp; |
4780 | break; | |
372316f1 | 4781 | } |
29d6859f LM |
4782 | |
4783 | /* If there is no available thread, the event would | |
4784 | have to be appended to a per-inferior event list, | |
4785 | which does not exist (and if it did, we'd have | |
4786 | to adjust run control command to be able to | |
4787 | resume such an inferior). We assert here instead | |
4788 | of going into an infinite loop. */ | |
4789 | gdb_assert (t != nullptr); | |
4790 | ||
edbcda09 SM |
4791 | infrun_log_debug ("using %s\n", |
4792 | target_pid_to_str (t->ptid).c_str ()); | |
29d6859f LM |
4793 | } |
4794 | else | |
4795 | { | |
4796 | t = find_thread_ptid (event.target, event.ptid); | |
4797 | /* Check if this is the first time we see this thread. | |
4798 | Don't bother adding if it individually exited. */ | |
4799 | if (t == nullptr | |
4800 | && event.ws.kind != TARGET_WAITKIND_THREAD_EXITED) | |
4801 | t = add_thread (event.target, event.ptid); | |
4802 | } | |
4803 | ||
4804 | if (t != nullptr) | |
4805 | { | |
4806 | /* Set the threads as non-executing to avoid | |
4807 | another stop attempt on them. */ | |
4808 | switch_to_thread_no_regs (t); | |
4809 | mark_non_executing_threads (event.target, event.ptid, | |
4810 | event.ws); | |
4811 | save_waitstatus (t, &event.ws); | |
4812 | t->stop_requested = false; | |
372316f1 PA |
4813 | } |
4814 | } | |
4815 | else | |
4816 | { | |
29d6859f LM |
4817 | thread_info *t = find_thread_ptid (event.target, event.ptid); |
4818 | if (t == NULL) | |
4819 | t = add_thread (event.target, event.ptid); | |
372316f1 | 4820 | |
29d6859f LM |
4821 | t->stop_requested = 0; |
4822 | t->executing = 0; | |
4823 | t->resumed = false; | |
4824 | t->control.may_range_step = 0; | |
4825 | ||
4826 | /* This may be the first time we see the inferior report | |
4827 | a stop. */ | |
4828 | inferior *inf = find_inferior_ptid (event.target, event.ptid); | |
4829 | if (inf->needs_setup) | |
372316f1 | 4830 | { |
29d6859f LM |
4831 | switch_to_thread_no_regs (t); |
4832 | setup_inferior (0); | |
372316f1 PA |
4833 | } |
4834 | ||
29d6859f LM |
4835 | if (event.ws.kind == TARGET_WAITKIND_STOPPED |
4836 | && event.ws.value.sig == GDB_SIGNAL_0) | |
372316f1 | 4837 | { |
29d6859f LM |
4838 | /* We caught the event that we intended to catch, so |
4839 | there's no event pending. */ | |
4840 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4841 | t->suspend.waitstatus_pending_p = 0; | |
4842 | ||
9844051a | 4843 | if (displaced_step_finish (t, GDB_SIGNAL_0) < 0) |
29d6859f LM |
4844 | { |
4845 | /* Add it back to the step-over queue. */ | |
edbcda09 SM |
4846 | infrun_log_debug ("displaced-step of %s " |
4847 | "canceled: adding back to the " | |
4848 | "step-over queue\n", | |
4849 | target_pid_to_str (t->ptid).c_str ()); | |
4850 | ||
29d6859f | 4851 | t->control.trap_expected = 0; |
7bd43605 | 4852 | global_thread_step_over_chain_enqueue (t); |
29d6859f | 4853 | } |
372316f1 | 4854 | } |
29d6859f LM |
4855 | else |
4856 | { | |
4857 | enum gdb_signal sig; | |
4858 | struct regcache *regcache; | |
372316f1 | 4859 | |
29d6859f LM |
4860 | if (debug_infrun) |
4861 | { | |
4862 | std::string statstr = target_waitstatus_to_string (&event.ws); | |
372316f1 | 4863 | |
edbcda09 SM |
4864 | infrun_log_debug ("target_wait %s, saving " |
4865 | "status for %d.%ld.%ld\n", | |
4866 | statstr.c_str (), | |
4867 | t->ptid.pid (), | |
4868 | t->ptid.lwp (), | |
4869 | t->ptid.tid ()); | |
29d6859f LM |
4870 | } |
4871 | ||
4872 | /* Record for later. */ | |
4873 | save_waitstatus (t, &event.ws); | |
4874 | ||
4875 | sig = (event.ws.kind == TARGET_WAITKIND_STOPPED | |
4876 | ? event.ws.value.sig : GDB_SIGNAL_0); | |
4877 | ||
9844051a | 4878 | if (displaced_step_finish (t, sig) < 0) |
29d6859f LM |
4879 | { |
4880 | /* Add it back to the step-over queue. */ | |
4881 | t->control.trap_expected = 0; | |
7bd43605 | 4882 | global_thread_step_over_chain_enqueue (t); |
29d6859f LM |
4883 | } |
4884 | ||
4885 | regcache = get_thread_regcache (t); | |
4886 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4887 | ||
edbcda09 SM |
4888 | infrun_log_debug ("saved stop_pc=%s for %s " |
4889 | "(currently_stepping=%d)\n", | |
4890 | paddress (target_gdbarch (), | |
4891 | t->suspend.stop_pc), | |
4892 | target_pid_to_str (t->ptid).c_str (), | |
4893 | currently_stepping (t)); | |
372316f1 PA |
4894 | } |
4895 | } | |
4896 | } | |
4897 | } | |
4898 | } | |
372316f1 PA |
4899 | } |
4900 | ||
f4836ba9 PA |
4901 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4902 | ||
4903 | static int | |
4904 | handle_no_resumed (struct execution_control_state *ecs) | |
4905 | { | |
3b12939d | 4906 | if (target_can_async_p ()) |
f4836ba9 | 4907 | { |
3b12939d | 4908 | int any_sync = 0; |
f4836ba9 | 4909 | |
2dab0c7b | 4910 | for (ui *ui : all_uis ()) |
3b12939d PA |
4911 | { |
4912 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4913 | { | |
4914 | any_sync = 1; | |
4915 | break; | |
4916 | } | |
4917 | } | |
4918 | if (!any_sync) | |
4919 | { | |
4920 | /* There were no unwaited-for children left in the target, but, | |
4921 | we're not synchronously waiting for events either. Just | |
4922 | ignore. */ | |
4923 | ||
edbcda09 | 4924 | infrun_log_debug ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)"); |
3b12939d PA |
4925 | prepare_to_wait (ecs); |
4926 | return 1; | |
4927 | } | |
f4836ba9 PA |
4928 | } |
4929 | ||
4930 | /* Otherwise, if we were running a synchronous execution command, we | |
4931 | may need to cancel it and give the user back the terminal. | |
4932 | ||
4933 | In non-stop mode, the target can't tell whether we've already | |
4934 | consumed previous stop events, so it can end up sending us a | |
4935 | no-resumed event like so: | |
4936 | ||
4937 | #0 - thread 1 is left stopped | |
4938 | ||
4939 | #1 - thread 2 is resumed and hits breakpoint | |
4940 | -> TARGET_WAITKIND_STOPPED | |
4941 | ||
4942 | #2 - thread 3 is resumed and exits | |
4943 | this is the last resumed thread, so | |
4944 | -> TARGET_WAITKIND_NO_RESUMED | |
4945 | ||
4946 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4947 | it. | |
4948 | ||
4949 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4950 | thread 2 is now resumed, so the event should be ignored. | |
4951 | ||
4952 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4953 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4954 | event. But it could be that the event meant that thread 2 itself | |
4955 | (or whatever other thread was the last resumed thread) exited. | |
4956 | ||
4957 | To address this we refresh the thread list and check whether we | |
4958 | have resumed threads _now_. In the example above, this removes | |
4959 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4960 | ignore this event. If we find no thread resumed, then we cancel | |
2ec0f7ff PA |
4961 | the synchronous command and show "no unwaited-for " to the |
4962 | user. */ | |
f4836ba9 | 4963 | |
aecd6cb8 | 4964 | inferior *curr_inf = current_inferior (); |
2ec0f7ff | 4965 | |
aecd6cb8 PA |
4966 | scoped_restore_current_thread restore_thread; |
4967 | ||
4968 | for (auto *target : all_non_exited_process_targets ()) | |
4969 | { | |
4970 | switch_to_target_no_thread (target); | |
4971 | update_thread_list (); | |
4972 | } | |
4973 | ||
4974 | /* If: | |
4975 | ||
4976 | - the current target has no thread executing, and | |
4977 | - the current inferior is native, and | |
4978 | - the current inferior is the one which has the terminal, and | |
4979 | - we did nothing, | |
4980 | ||
4981 | then a Ctrl-C from this point on would remain stuck in the | |
4982 | kernel, until a thread resumes and dequeues it. That would | |
4983 | result in the GDB CLI not reacting to Ctrl-C, not able to | |
4984 | interrupt the program. To address this, if the current inferior | |
4985 | no longer has any thread executing, we give the terminal to some | |
4986 | other inferior that has at least one thread executing. */ | |
4987 | bool swap_terminal = true; | |
4988 | ||
4989 | /* Whether to ignore this TARGET_WAITKIND_NO_RESUMED event, or | |
4990 | whether to report it to the user. */ | |
4991 | bool ignore_event = false; | |
2ec0f7ff PA |
4992 | |
4993 | for (thread_info *thread : all_non_exited_threads ()) | |
f4836ba9 | 4994 | { |
aecd6cb8 PA |
4995 | if (swap_terminal && thread->executing) |
4996 | { | |
4997 | if (thread->inf != curr_inf) | |
4998 | { | |
4999 | target_terminal::ours (); | |
5000 | ||
5001 | switch_to_thread (thread); | |
5002 | target_terminal::inferior (); | |
5003 | } | |
5004 | swap_terminal = false; | |
5005 | } | |
5006 | ||
5007 | if (!ignore_event | |
5008 | && (thread->executing | |
5009 | || thread->suspend.waitstatus_pending_p)) | |
f4836ba9 | 5010 | { |
2ec0f7ff PA |
5011 | /* Either there were no unwaited-for children left in the |
5012 | target at some point, but there are now, or some target | |
5013 | other than the eventing one has unwaited-for children | |
5014 | left. Just ignore. */ | |
edbcda09 SM |
5015 | infrun_log_debug ("TARGET_WAITKIND_NO_RESUMED " |
5016 | "(ignoring: found resumed)\n"); | |
aecd6cb8 PA |
5017 | |
5018 | ignore_event = true; | |
f4836ba9 | 5019 | } |
aecd6cb8 PA |
5020 | |
5021 | if (ignore_event && !swap_terminal) | |
5022 | break; | |
5023 | } | |
5024 | ||
5025 | if (ignore_event) | |
5026 | { | |
5027 | switch_to_inferior_no_thread (curr_inf); | |
5028 | prepare_to_wait (ecs); | |
5029 | return 1; | |
f4836ba9 PA |
5030 | } |
5031 | ||
5032 | /* Go ahead and report the event. */ | |
5033 | return 0; | |
5034 | } | |
5035 | ||
05ba8510 PA |
5036 | /* Given an execution control state that has been freshly filled in by |
5037 | an event from the inferior, figure out what it means and take | |
5038 | appropriate action. | |
5039 | ||
5040 | The alternatives are: | |
5041 | ||
22bcd14b | 5042 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5043 | debugger. |
5044 | ||
5045 | 2) keep_going and return; to wait for the next event (set | |
5046 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5047 | once). */ | |
c906108c | 5048 | |
ec9499be | 5049 | static void |
595915c1 | 5050 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5051 | { |
595915c1 TT |
5052 | /* Make sure that all temporary struct value objects that were |
5053 | created during the handling of the event get deleted at the | |
5054 | end. */ | |
5055 | scoped_value_mark free_values; | |
5056 | ||
d6b48e9c PA |
5057 | enum stop_kind stop_soon; |
5058 | ||
edbcda09 | 5059 | infrun_log_debug ("%s", target_waitstatus_to_string (&ecs->ws).c_str ()); |
c29705b7 | 5060 | |
28736962 PA |
5061 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
5062 | { | |
5063 | /* We had an event in the inferior, but we are not interested in | |
5064 | handling it at this level. The lower layers have already | |
5065 | done what needs to be done, if anything. | |
5066 | ||
5067 | One of the possible circumstances for this is when the | |
5068 | inferior produces output for the console. The inferior has | |
5069 | not stopped, and we are ignoring the event. Another possible | |
5070 | circumstance is any event which the lower level knows will be | |
5071 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5072 | prepare_to_wait (ecs); |
5073 | return; | |
5074 | } | |
5075 | ||
65706a29 PA |
5076 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
5077 | { | |
65706a29 PA |
5078 | prepare_to_wait (ecs); |
5079 | return; | |
5080 | } | |
5081 | ||
0e5bf2a8 | 5082 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5083 | && handle_no_resumed (ecs)) |
5084 | return; | |
0e5bf2a8 | 5085 | |
5b6d1e4f PA |
5086 | /* Cache the last target/ptid/waitstatus. */ |
5087 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5088 | |
ca005067 | 5089 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5090 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5091 | |
0e5bf2a8 PA |
5092 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
5093 | { | |
5094 | /* No unwaited-for children left. IOW, all resumed children | |
5095 | have exited. */ | |
0e5bf2a8 | 5096 | stop_print_frame = 0; |
22bcd14b | 5097 | stop_waiting (ecs); |
0e5bf2a8 PA |
5098 | return; |
5099 | } | |
5100 | ||
8c90c137 | 5101 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 5102 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 | 5103 | { |
5b6d1e4f | 5104 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5105 | /* If it's a new thread, add it to the thread database. */ |
5106 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5107 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5108 | |
5109 | /* Disable range stepping. If the next step request could use a | |
5110 | range, this will be end up re-enabled then. */ | |
5111 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5112 | } |
88ed393a JK |
5113 | |
5114 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 5115 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
5116 | |
5117 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5118 | reinit_frame_cache (); | |
5119 | ||
28736962 PA |
5120 | breakpoint_retire_moribund (); |
5121 | ||
2b009048 DJ |
5122 | /* First, distinguish signals caused by the debugger from signals |
5123 | that have to do with the program's own actions. Note that | |
5124 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5125 | on the operating system version. Here we detect when a SIGILL or | |
5126 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5127 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5128 | when we're trying to execute a breakpoint instruction on a | |
5129 | non-executable stack. This happens for call dummy breakpoints | |
5130 | for architectures like SPARC that place call dummies on the | |
5131 | stack. */ | |
2b009048 | 5132 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
5133 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
5134 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
5135 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 5136 | { |
00431a78 | 5137 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5138 | |
a01bda52 | 5139 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5140 | regcache_read_pc (regcache))) |
5141 | { | |
edbcda09 | 5142 | infrun_log_debug ("Treating signal as SIGTRAP"); |
a493e3e2 | 5143 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 5144 | } |
2b009048 DJ |
5145 | } |
5146 | ||
293b3ebc | 5147 | mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws); |
8c90c137 | 5148 | |
488f131b JB |
5149 | switch (ecs->ws.kind) |
5150 | { | |
5151 | case TARGET_WAITKIND_LOADED: | |
00431a78 | 5152 | context_switch (ecs); |
b0f4b84b DJ |
5153 | /* Ignore gracefully during startup of the inferior, as it might |
5154 | be the shell which has just loaded some objects, otherwise | |
5155 | add the symbols for the newly loaded objects. Also ignore at | |
5156 | the beginning of an attach or remote session; we will query | |
5157 | the full list of libraries once the connection is | |
5158 | established. */ | |
4f5d7f63 | 5159 | |
00431a78 | 5160 | stop_soon = get_inferior_stop_soon (ecs); |
c0236d92 | 5161 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 5162 | { |
edcc5120 TT |
5163 | struct regcache *regcache; |
5164 | ||
00431a78 | 5165 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 TT |
5166 | |
5167 | handle_solib_event (); | |
5168 | ||
5169 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 5170 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
5171 | ecs->event_thread->suspend.stop_pc, |
5172 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 5173 | |
c65d6b55 PA |
5174 | if (handle_stop_requested (ecs)) |
5175 | return; | |
5176 | ||
ce12b012 | 5177 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
5178 | { |
5179 | /* A catchpoint triggered. */ | |
94c57d6a PA |
5180 | process_event_stop_test (ecs); |
5181 | return; | |
edcc5120 | 5182 | } |
488f131b | 5183 | |
b0f4b84b DJ |
5184 | /* If requested, stop when the dynamic linker notifies |
5185 | gdb of events. This allows the user to get control | |
5186 | and place breakpoints in initializer routines for | |
5187 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 5188 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
5189 | if (stop_on_solib_events) |
5190 | { | |
55409f9d DJ |
5191 | /* Make sure we print "Stopped due to solib-event" in |
5192 | normal_stop. */ | |
5193 | stop_print_frame = 1; | |
5194 | ||
22bcd14b | 5195 | stop_waiting (ecs); |
b0f4b84b DJ |
5196 | return; |
5197 | } | |
488f131b | 5198 | } |
b0f4b84b DJ |
5199 | |
5200 | /* If we are skipping through a shell, or through shared library | |
5201 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 5202 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
5203 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
5204 | { | |
74960c60 VP |
5205 | /* Loading of shared libraries might have changed breakpoint |
5206 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 5207 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 5208 | insert_breakpoints (); |
64ce06e4 | 5209 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
5210 | prepare_to_wait (ecs); |
5211 | return; | |
5212 | } | |
5213 | ||
5c09a2c5 PA |
5214 | /* But stop if we're attaching or setting up a remote |
5215 | connection. */ | |
5216 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5217 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5218 | { | |
edbcda09 | 5219 | infrun_log_debug ("quietly stopped"); |
22bcd14b | 5220 | stop_waiting (ecs); |
5c09a2c5 PA |
5221 | return; |
5222 | } | |
5223 | ||
5224 | internal_error (__FILE__, __LINE__, | |
5225 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 5226 | |
488f131b | 5227 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5228 | if (handle_stop_requested (ecs)) |
5229 | return; | |
00431a78 | 5230 | context_switch (ecs); |
64ce06e4 | 5231 | resume (GDB_SIGNAL_0); |
488f131b JB |
5232 | prepare_to_wait (ecs); |
5233 | return; | |
c5aa993b | 5234 | |
65706a29 | 5235 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5236 | if (handle_stop_requested (ecs)) |
5237 | return; | |
00431a78 | 5238 | context_switch (ecs); |
65706a29 PA |
5239 | if (!switch_back_to_stepped_thread (ecs)) |
5240 | keep_going (ecs); | |
5241 | return; | |
5242 | ||
488f131b | 5243 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5244 | case TARGET_WAITKIND_SIGNALLED: |
18493a00 PA |
5245 | { |
5246 | /* Depending on the system, ecs->ptid may point to a thread or | |
5247 | to a process. On some targets, target_mourn_inferior may | |
5248 | need to have access to the just-exited thread. That is the | |
5249 | case of GNU/Linux's "checkpoint" support, for example. | |
5250 | Call the switch_to_xxx routine as appropriate. */ | |
5251 | thread_info *thr = find_thread_ptid (ecs->target, ecs->ptid); | |
5252 | if (thr != nullptr) | |
5253 | switch_to_thread (thr); | |
5254 | else | |
5255 | { | |
5256 | inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); | |
5257 | switch_to_inferior_no_thread (inf); | |
5258 | } | |
5259 | } | |
6c95b8df | 5260 | handle_vfork_child_exec_or_exit (0); |
223ffa71 | 5261 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5262 | |
0c557179 SDJ |
5263 | /* Clearing any previous state of convenience variables. */ |
5264 | clear_exit_convenience_vars (); | |
5265 | ||
940c3c06 PA |
5266 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5267 | { | |
5268 | /* Record the exit code in the convenience variable $_exitcode, so | |
5269 | that the user can inspect this again later. */ | |
5270 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5271 | (LONGEST) ecs->ws.value.integer); | |
5272 | ||
5273 | /* Also record this in the inferior itself. */ | |
5274 | current_inferior ()->has_exit_code = 1; | |
5275 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5276 | |
98eb56a4 PA |
5277 | /* Support the --return-child-result option. */ |
5278 | return_child_result_value = ecs->ws.value.integer; | |
5279 | ||
76727919 | 5280 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
5281 | } |
5282 | else | |
0c557179 | 5283 | { |
00431a78 | 5284 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5285 | |
5286 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5287 | { | |
5288 | /* Set the value of the internal variable $_exitsignal, | |
5289 | which holds the signal uncaught by the inferior. */ | |
5290 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5291 | gdbarch_gdb_signal_to_target (gdbarch, | |
5292 | ecs->ws.value.sig)); | |
5293 | } | |
5294 | else | |
5295 | { | |
5296 | /* We don't have access to the target's method used for | |
5297 | converting between signal numbers (GDB's internal | |
5298 | representation <-> target's representation). | |
5299 | Therefore, we cannot do a good job at displaying this | |
5300 | information to the user. It's better to just warn | |
5301 | her about it (if infrun debugging is enabled), and | |
5302 | give up. */ | |
edbcda09 SM |
5303 | infrun_log_debug ("Cannot fill $_exitsignal with the correct " |
5304 | "signal number."); | |
0c557179 SDJ |
5305 | } |
5306 | ||
76727919 | 5307 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 5308 | } |
8cf64490 | 5309 | |
488f131b | 5310 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5311 | target_mourn_inferior (inferior_ptid); |
488f131b | 5312 | stop_print_frame = 0; |
22bcd14b | 5313 | stop_waiting (ecs); |
488f131b | 5314 | return; |
c5aa993b | 5315 | |
488f131b | 5316 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5317 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5318 | /* Check whether the inferior is displaced stepping. */ |
5319 | { | |
00431a78 | 5320 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5321 | struct gdbarch *gdbarch = regcache->arch (); |
e2d96639 YQ |
5322 | |
5323 | /* If checking displaced stepping is supported, and thread | |
5324 | ecs->ptid is displaced stepping. */ | |
9844051a | 5325 | if (displaced_step_in_progress (ecs->event_thread)) |
e2d96639 YQ |
5326 | { |
5327 | struct inferior *parent_inf | |
5b6d1e4f | 5328 | = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 YQ |
5329 | struct regcache *child_regcache; |
5330 | CORE_ADDR parent_pc; | |
5331 | ||
d8d83535 SM |
5332 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) |
5333 | { | |
9844051a SM |
5334 | // struct displaced_step_inferior_state *displaced |
5335 | // = get_displaced_stepping_state (parent_inf); | |
d8d83535 SM |
5336 | |
5337 | /* Restore scratch pad for child process. */ | |
9844051a SM |
5338 | //displaced_step_restore (displaced, ecs->ws.value.related_pid); |
5339 | // FIXME: we should restore all the buffers that were currently in use | |
d8d83535 SM |
5340 | } |
5341 | ||
e2d96639 YQ |
5342 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, |
5343 | indicating that the displaced stepping of syscall instruction | |
5344 | has been done. Perform cleanup for parent process here. Note | |
5345 | that this operation also cleans up the child process for vfork, | |
5346 | because their pages are shared. */ | |
9844051a | 5347 | displaced_step_finish (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5348 | /* Start a new step-over in another thread if there's one |
5349 | that needs it. */ | |
5350 | start_step_over (); | |
e2d96639 | 5351 | |
e2d96639 YQ |
5352 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5353 | the child's PC is also within the scratchpad. Set the child's PC | |
5354 | to the parent's PC value, which has already been fixed up. | |
5355 | FIXME: we use the parent's aspace here, although we're touching | |
5356 | the child, because the child hasn't been added to the inferior | |
5357 | list yet at this point. */ | |
5358 | ||
5359 | child_regcache | |
5b6d1e4f PA |
5360 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
5361 | ecs->ws.value.related_pid, | |
e2d96639 YQ |
5362 | gdbarch, |
5363 | parent_inf->aspace); | |
5364 | /* Read PC value of parent process. */ | |
5365 | parent_pc = regcache_read_pc (regcache); | |
5366 | ||
5367 | if (debug_displaced) | |
5368 | fprintf_unfiltered (gdb_stdlog, | |
5369 | "displaced: write child pc from %s to %s\n", | |
5370 | paddress (gdbarch, | |
5371 | regcache_read_pc (child_regcache)), | |
5372 | paddress (gdbarch, parent_pc)); | |
5373 | ||
5374 | regcache_write_pc (child_regcache, parent_pc); | |
5375 | } | |
5376 | } | |
5377 | ||
00431a78 | 5378 | context_switch (ecs); |
5a2901d9 | 5379 | |
b242c3c2 PA |
5380 | /* Immediately detach breakpoints from the child before there's |
5381 | any chance of letting the user delete breakpoints from the | |
5382 | breakpoint lists. If we don't do this early, it's easy to | |
5383 | leave left over traps in the child, vis: "break foo; catch | |
5384 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5385 | the fork on the last `continue', and by that time the | |
5386 | breakpoint at "foo" is long gone from the breakpoint table. | |
5387 | If we vforked, then we don't need to unpatch here, since both | |
5388 | parent and child are sharing the same memory pages; we'll | |
5389 | need to unpatch at follow/detach time instead to be certain | |
5390 | that new breakpoints added between catchpoint hit time and | |
5391 | vfork follow are detached. */ | |
5392 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5393 | { | |
b242c3c2 PA |
5394 | /* This won't actually modify the breakpoint list, but will |
5395 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5396 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5397 | } |
5398 | ||
34b7e8a6 | 5399 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5400 | |
e58b0e63 PA |
5401 | /* In case the event is caught by a catchpoint, remember that |
5402 | the event is to be followed at the next resume of the thread, | |
5403 | and not immediately. */ | |
5404 | ecs->event_thread->pending_follow = ecs->ws; | |
5405 | ||
f2ffa92b PA |
5406 | ecs->event_thread->suspend.stop_pc |
5407 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 5408 | |
16c381f0 | 5409 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5410 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5411 | ecs->event_thread->suspend.stop_pc, |
5412 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 5413 | |
c65d6b55 PA |
5414 | if (handle_stop_requested (ecs)) |
5415 | return; | |
5416 | ||
ce12b012 PA |
5417 | /* If no catchpoint triggered for this, then keep going. Note |
5418 | that we're interested in knowing the bpstat actually causes a | |
5419 | stop, not just if it may explain the signal. Software | |
5420 | watchpoints, for example, always appear in the bpstat. */ | |
5421 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5422 | { |
5ab2fbf1 | 5423 | bool follow_child |
3e43a32a | 5424 | = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 5425 | |
a493e3e2 | 5426 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 | 5427 | |
5b6d1e4f PA |
5428 | process_stratum_target *targ |
5429 | = ecs->event_thread->inf->process_target (); | |
5430 | ||
5ab2fbf1 | 5431 | bool should_resume = follow_fork (); |
e58b0e63 | 5432 | |
5b6d1e4f PA |
5433 | /* Note that one of these may be an invalid pointer, |
5434 | depending on detach_fork. */ | |
00431a78 | 5435 | thread_info *parent = ecs->event_thread; |
5b6d1e4f PA |
5436 | thread_info *child |
5437 | = find_thread_ptid (targ, ecs->ws.value.related_pid); | |
6c95b8df | 5438 | |
a2077e25 PA |
5439 | /* At this point, the parent is marked running, and the |
5440 | child is marked stopped. */ | |
5441 | ||
5442 | /* If not resuming the parent, mark it stopped. */ | |
5443 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5444 | parent->set_running (false); |
a2077e25 PA |
5445 | |
5446 | /* If resuming the child, mark it running. */ | |
5447 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5448 | child->set_running (true); |
a2077e25 | 5449 | |
6c95b8df | 5450 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5451 | if (!detach_fork && (non_stop |
5452 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5453 | { |
5454 | if (follow_child) | |
5455 | switch_to_thread (parent); | |
5456 | else | |
5457 | switch_to_thread (child); | |
5458 | ||
5459 | ecs->event_thread = inferior_thread (); | |
5460 | ecs->ptid = inferior_ptid; | |
5461 | keep_going (ecs); | |
5462 | } | |
5463 | ||
5464 | if (follow_child) | |
5465 | switch_to_thread (child); | |
5466 | else | |
5467 | switch_to_thread (parent); | |
5468 | ||
e58b0e63 PA |
5469 | ecs->event_thread = inferior_thread (); |
5470 | ecs->ptid = inferior_ptid; | |
5471 | ||
5472 | if (should_resume) | |
5473 | keep_going (ecs); | |
5474 | else | |
22bcd14b | 5475 | stop_waiting (ecs); |
04e68871 DJ |
5476 | return; |
5477 | } | |
94c57d6a PA |
5478 | process_event_stop_test (ecs); |
5479 | return; | |
488f131b | 5480 | |
6c95b8df PA |
5481 | case TARGET_WAITKIND_VFORK_DONE: |
5482 | /* Done with the shared memory region. Re-insert breakpoints in | |
5483 | the parent, and keep going. */ | |
5484 | ||
00431a78 | 5485 | context_switch (ecs); |
6c95b8df PA |
5486 | |
5487 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5488 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5489 | |
5490 | if (handle_stop_requested (ecs)) | |
5491 | return; | |
5492 | ||
6c95b8df PA |
5493 | /* This also takes care of reinserting breakpoints in the |
5494 | previously locked inferior. */ | |
5495 | keep_going (ecs); | |
5496 | return; | |
5497 | ||
488f131b | 5498 | case TARGET_WAITKIND_EXECD: |
488f131b | 5499 | |
cbd2b4e3 PA |
5500 | /* Note we can't read registers yet (the stop_pc), because we |
5501 | don't yet know the inferior's post-exec architecture. | |
5502 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5503 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5504 | |
6c95b8df PA |
5505 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5506 | handle_vfork_child_exec_or_exit (1); | |
5507 | ||
795e548f PA |
5508 | /* This causes the eventpoints and symbol table to be reset. |
5509 | Must do this now, before trying to determine whether to | |
5510 | stop. */ | |
71b43ef8 | 5511 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5512 | |
17d8546e DB |
5513 | /* In follow_exec we may have deleted the original thread and |
5514 | created a new one. Make sure that the event thread is the | |
5515 | execd thread for that case (this is a nop otherwise). */ | |
5516 | ecs->event_thread = inferior_thread (); | |
5517 | ||
f2ffa92b PA |
5518 | ecs->event_thread->suspend.stop_pc |
5519 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5520 | |
16c381f0 | 5521 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5522 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5523 | ecs->event_thread->suspend.stop_pc, |
5524 | ecs->event_thread, &ecs->ws); | |
795e548f | 5525 | |
71b43ef8 PA |
5526 | /* Note that this may be referenced from inside |
5527 | bpstat_stop_status above, through inferior_has_execd. */ | |
5528 | xfree (ecs->ws.value.execd_pathname); | |
5529 | ecs->ws.value.execd_pathname = NULL; | |
5530 | ||
c65d6b55 PA |
5531 | if (handle_stop_requested (ecs)) |
5532 | return; | |
5533 | ||
04e68871 | 5534 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5535 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5536 | { |
a493e3e2 | 5537 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5538 | keep_going (ecs); |
5539 | return; | |
5540 | } | |
94c57d6a PA |
5541 | process_event_stop_test (ecs); |
5542 | return; | |
488f131b | 5543 | |
b4dc5ffa MK |
5544 | /* Be careful not to try to gather much state about a thread |
5545 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5546 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5547 | /* Getting the current syscall number. */ |
94c57d6a PA |
5548 | if (handle_syscall_event (ecs) == 0) |
5549 | process_event_stop_test (ecs); | |
5550 | return; | |
c906108c | 5551 | |
488f131b JB |
5552 | /* Before examining the threads further, step this thread to |
5553 | get it entirely out of the syscall. (We get notice of the | |
5554 | event when the thread is just on the verge of exiting a | |
5555 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5556 | into user code.) */ |
488f131b | 5557 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5558 | if (handle_syscall_event (ecs) == 0) |
5559 | process_event_stop_test (ecs); | |
5560 | return; | |
c906108c | 5561 | |
488f131b | 5562 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5563 | handle_signal_stop (ecs); |
5564 | return; | |
c906108c | 5565 | |
b2175913 MS |
5566 | case TARGET_WAITKIND_NO_HISTORY: |
5567 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5568 | |
d1988021 | 5569 | /* Switch to the stopped thread. */ |
00431a78 | 5570 | context_switch (ecs); |
edbcda09 | 5571 | infrun_log_debug ("stopped"); |
d1988021 | 5572 | |
34b7e8a6 | 5573 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5574 | ecs->event_thread->suspend.stop_pc |
5575 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5576 | |
5577 | if (handle_stop_requested (ecs)) | |
5578 | return; | |
5579 | ||
76727919 | 5580 | gdb::observers::no_history.notify (); |
22bcd14b | 5581 | stop_waiting (ecs); |
b2175913 | 5582 | return; |
488f131b | 5583 | } |
4f5d7f63 PA |
5584 | } |
5585 | ||
372316f1 PA |
5586 | /* Restart threads back to what they were trying to do back when we |
5587 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5588 | ignored. */ | |
4d9d9d04 PA |
5589 | |
5590 | static void | |
372316f1 PA |
5591 | restart_threads (struct thread_info *event_thread) |
5592 | { | |
372316f1 PA |
5593 | /* In case the instruction just stepped spawned a new thread. */ |
5594 | update_thread_list (); | |
5595 | ||
08036331 | 5596 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5597 | { |
f3f8ece4 PA |
5598 | switch_to_thread_no_regs (tp); |
5599 | ||
372316f1 PA |
5600 | if (tp == event_thread) |
5601 | { | |
edbcda09 SM |
5602 | infrun_log_debug ("restart threads: [%s] is event thread", |
5603 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5604 | continue; |
5605 | } | |
5606 | ||
5607 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5608 | { | |
edbcda09 SM |
5609 | infrun_log_debug ("restart threads: [%s] not meant to be running", |
5610 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5611 | continue; |
5612 | } | |
5613 | ||
5614 | if (tp->resumed) | |
5615 | { | |
edbcda09 SM |
5616 | infrun_log_debug ("restart threads: [%s] resumed", |
5617 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5618 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
5619 | continue; | |
5620 | } | |
5621 | ||
5622 | if (thread_is_in_step_over_chain (tp)) | |
5623 | { | |
edbcda09 SM |
5624 | infrun_log_debug ("restart threads: [%s] needs step-over", |
5625 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5626 | gdb_assert (!tp->resumed); |
5627 | continue; | |
5628 | } | |
5629 | ||
5630 | ||
5631 | if (tp->suspend.waitstatus_pending_p) | |
5632 | { | |
edbcda09 SM |
5633 | infrun_log_debug ("restart threads: [%s] has pending status", |
5634 | target_pid_to_str (tp->ptid).c_str ()); | |
719546c4 | 5635 | tp->resumed = true; |
372316f1 PA |
5636 | continue; |
5637 | } | |
5638 | ||
c65d6b55 PA |
5639 | gdb_assert (!tp->stop_requested); |
5640 | ||
372316f1 PA |
5641 | /* If some thread needs to start a step-over at this point, it |
5642 | should still be in the step-over queue, and thus skipped | |
5643 | above. */ | |
5644 | if (thread_still_needs_step_over (tp)) | |
5645 | { | |
5646 | internal_error (__FILE__, __LINE__, | |
5647 | "thread [%s] needs a step-over, but not in " | |
5648 | "step-over queue\n", | |
a068643d | 5649 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5650 | } |
5651 | ||
5652 | if (currently_stepping (tp)) | |
5653 | { | |
edbcda09 SM |
5654 | infrun_log_debug ("restart threads: [%s] was stepping", |
5655 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5656 | keep_going_stepped_thread (tp); |
5657 | } | |
5658 | else | |
5659 | { | |
5660 | struct execution_control_state ecss; | |
5661 | struct execution_control_state *ecs = &ecss; | |
5662 | ||
edbcda09 SM |
5663 | infrun_log_debug ("restart threads: [%s] continuing", |
5664 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 5665 | reset_ecs (ecs, tp); |
00431a78 | 5666 | switch_to_thread (tp); |
372316f1 PA |
5667 | keep_going_pass_signal (ecs); |
5668 | } | |
5669 | } | |
5670 | } | |
5671 | ||
5672 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5673 | a pending waitstatus. */ | |
5674 | ||
5675 | static int | |
5676 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5677 | void *arg) | |
5678 | { | |
5679 | return (tp->resumed | |
5680 | && tp->suspend.waitstatus_pending_p); | |
5681 | } | |
5682 | ||
5683 | /* Called when we get an event that may finish an in-line or | |
5684 | out-of-line (displaced stepping) step-over started previously. | |
5685 | Return true if the event is processed and we should go back to the | |
5686 | event loop; false if the caller should continue processing the | |
5687 | event. */ | |
5688 | ||
5689 | static int | |
4d9d9d04 PA |
5690 | finish_step_over (struct execution_control_state *ecs) |
5691 | { | |
372316f1 PA |
5692 | int had_step_over_info; |
5693 | ||
9844051a SM |
5694 | displaced_step_finish (ecs->event_thread, |
5695 | ecs->event_thread->suspend.stop_signal); | |
4d9d9d04 | 5696 | |
372316f1 PA |
5697 | had_step_over_info = step_over_info_valid_p (); |
5698 | ||
5699 | if (had_step_over_info) | |
4d9d9d04 PA |
5700 | { |
5701 | /* If we're stepping over a breakpoint with all threads locked, | |
5702 | then only the thread that was stepped should be reporting | |
5703 | back an event. */ | |
5704 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5705 | ||
c65d6b55 | 5706 | clear_step_over_info (); |
4d9d9d04 PA |
5707 | } |
5708 | ||
fbea99ea | 5709 | if (!target_is_non_stop_p ()) |
372316f1 | 5710 | return 0; |
4d9d9d04 PA |
5711 | |
5712 | /* Start a new step-over in another thread if there's one that | |
5713 | needs it. */ | |
5714 | start_step_over (); | |
372316f1 PA |
5715 | |
5716 | /* If we were stepping over a breakpoint before, and haven't started | |
5717 | a new in-line step-over sequence, then restart all other threads | |
5718 | (except the event thread). We can't do this in all-stop, as then | |
5719 | e.g., we wouldn't be able to issue any other remote packet until | |
5720 | these other threads stop. */ | |
5721 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5722 | { | |
5723 | struct thread_info *pending; | |
5724 | ||
5725 | /* If we only have threads with pending statuses, the restart | |
5726 | below won't restart any thread and so nothing re-inserts the | |
5727 | breakpoint we just stepped over. But we need it inserted | |
5728 | when we later process the pending events, otherwise if | |
5729 | another thread has a pending event for this breakpoint too, | |
5730 | we'd discard its event (because the breakpoint that | |
5731 | originally caused the event was no longer inserted). */ | |
00431a78 | 5732 | context_switch (ecs); |
372316f1 PA |
5733 | insert_breakpoints (); |
5734 | ||
5735 | restart_threads (ecs->event_thread); | |
5736 | ||
5737 | /* If we have events pending, go through handle_inferior_event | |
5738 | again, picking up a pending event at random. This avoids | |
5739 | thread starvation. */ | |
5740 | ||
5741 | /* But not if we just stepped over a watchpoint in order to let | |
5742 | the instruction execute so we can evaluate its expression. | |
5743 | The set of watchpoints that triggered is recorded in the | |
5744 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5745 | If we processed another event first, that other event could | |
5746 | clobber this info. */ | |
5747 | if (ecs->event_thread->stepping_over_watchpoint) | |
5748 | return 0; | |
5749 | ||
5750 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5751 | NULL); | |
5752 | if (pending != NULL) | |
5753 | { | |
5754 | struct thread_info *tp = ecs->event_thread; | |
5755 | struct regcache *regcache; | |
5756 | ||
edbcda09 SM |
5757 | infrun_log_debug ("found resumed threads with " |
5758 | "pending events, saving status"); | |
372316f1 PA |
5759 | |
5760 | gdb_assert (pending != tp); | |
5761 | ||
5762 | /* Record the event thread's event for later. */ | |
5763 | save_waitstatus (tp, &ecs->ws); | |
5764 | /* This was cleared early, by handle_inferior_event. Set it | |
5765 | so this pending event is considered by | |
5766 | do_target_wait. */ | |
719546c4 | 5767 | tp->resumed = true; |
372316f1 PA |
5768 | |
5769 | gdb_assert (!tp->executing); | |
5770 | ||
00431a78 | 5771 | regcache = get_thread_regcache (tp); |
372316f1 PA |
5772 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
5773 | ||
edbcda09 SM |
5774 | infrun_log_debug ("saved stop_pc=%s for %s " |
5775 | "(currently_stepping=%d)\n", | |
5776 | paddress (target_gdbarch (), | |
5777 | tp->suspend.stop_pc), | |
5778 | target_pid_to_str (tp->ptid).c_str (), | |
5779 | currently_stepping (tp)); | |
372316f1 PA |
5780 | |
5781 | /* This in-line step-over finished; clear this so we won't | |
5782 | start a new one. This is what handle_signal_stop would | |
5783 | do, if we returned false. */ | |
5784 | tp->stepping_over_breakpoint = 0; | |
5785 | ||
5786 | /* Wake up the event loop again. */ | |
5787 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5788 | ||
5789 | prepare_to_wait (ecs); | |
5790 | return 1; | |
5791 | } | |
5792 | } | |
5793 | ||
5794 | return 0; | |
4d9d9d04 PA |
5795 | } |
5796 | ||
4f5d7f63 PA |
5797 | /* Come here when the program has stopped with a signal. */ |
5798 | ||
5799 | static void | |
5800 | handle_signal_stop (struct execution_control_state *ecs) | |
5801 | { | |
5802 | struct frame_info *frame; | |
5803 | struct gdbarch *gdbarch; | |
5804 | int stopped_by_watchpoint; | |
5805 | enum stop_kind stop_soon; | |
5806 | int random_signal; | |
c906108c | 5807 | |
f0407826 DE |
5808 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5809 | ||
c65d6b55 PA |
5810 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5811 | ||
f0407826 DE |
5812 | /* Do we need to clean up the state of a thread that has |
5813 | completed a displaced single-step? (Doing so usually affects | |
5814 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5815 | if (finish_step_over (ecs)) |
5816 | return; | |
f0407826 DE |
5817 | |
5818 | /* If we either finished a single-step or hit a breakpoint, but | |
5819 | the user wanted this thread to be stopped, pretend we got a | |
5820 | SIG0 (generic unsignaled stop). */ | |
5821 | if (ecs->event_thread->stop_requested | |
5822 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5823 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5824 | |
f2ffa92b PA |
5825 | ecs->event_thread->suspend.stop_pc |
5826 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 5827 | |
527159b7 | 5828 | if (debug_infrun) |
237fc4c9 | 5829 | { |
00431a78 | 5830 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 5831 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 5832 | |
f3f8ece4 | 5833 | switch_to_thread (ecs->event_thread); |
5af949e3 | 5834 | |
edbcda09 SM |
5835 | infrun_log_debug ("stop_pc=%s", |
5836 | paddress (reg_gdbarch, | |
5837 | ecs->event_thread->suspend.stop_pc)); | |
d92524f1 | 5838 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5839 | { |
5840 | CORE_ADDR addr; | |
abbb1732 | 5841 | |
edbcda09 | 5842 | infrun_log_debug ("stopped by watchpoint"); |
237fc4c9 | 5843 | |
8b88a78e | 5844 | if (target_stopped_data_address (current_top_target (), &addr)) |
edbcda09 SM |
5845 | infrun_log_debug ("stopped data address=%s", |
5846 | paddress (reg_gdbarch, addr)); | |
237fc4c9 | 5847 | else |
edbcda09 | 5848 | infrun_log_debug ("(no data address available)"); |
237fc4c9 PA |
5849 | } |
5850 | } | |
527159b7 | 5851 | |
36fa8042 PA |
5852 | /* This is originated from start_remote(), start_inferior() and |
5853 | shared libraries hook functions. */ | |
00431a78 | 5854 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
5855 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
5856 | { | |
00431a78 | 5857 | context_switch (ecs); |
edbcda09 | 5858 | infrun_log_debug ("quietly stopped"); |
36fa8042 | 5859 | stop_print_frame = 1; |
22bcd14b | 5860 | stop_waiting (ecs); |
36fa8042 PA |
5861 | return; |
5862 | } | |
5863 | ||
36fa8042 PA |
5864 | /* This originates from attach_command(). We need to overwrite |
5865 | the stop_signal here, because some kernels don't ignore a | |
5866 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5867 | See more comments in inferior.h. On the other hand, if we | |
5868 | get a non-SIGSTOP, report it to the user - assume the backend | |
5869 | will handle the SIGSTOP if it should show up later. | |
5870 | ||
5871 | Also consider that the attach is complete when we see a | |
5872 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5873 | target extended-remote report it instead of a SIGSTOP | |
5874 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5875 | signal, so this is no exception. | |
5876 | ||
5877 | Also consider that the attach is complete when we see a | |
5878 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5879 | the target to stop all threads of the inferior, in case the | |
5880 | low level attach operation doesn't stop them implicitly. If | |
5881 | they weren't stopped implicitly, then the stub will report a | |
5882 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5883 | other than GDB's request. */ | |
5884 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5885 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5886 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5887 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5888 | { | |
5889 | stop_print_frame = 1; | |
22bcd14b | 5890 | stop_waiting (ecs); |
36fa8042 PA |
5891 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5892 | return; | |
5893 | } | |
5894 | ||
488f131b | 5895 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 | 5896 | so, then switch to that thread. */ |
d7e15655 | 5897 | if (ecs->ptid != inferior_ptid) |
488f131b | 5898 | { |
edbcda09 | 5899 | infrun_log_debug ("context switch"); |
527159b7 | 5900 | |
00431a78 | 5901 | context_switch (ecs); |
c5aa993b | 5902 | |
9a4105ab | 5903 | if (deprecated_context_hook) |
00431a78 | 5904 | deprecated_context_hook (ecs->event_thread->global_num); |
488f131b | 5905 | } |
c906108c | 5906 | |
568d6575 UW |
5907 | /* At this point, get hold of the now-current thread's frame. */ |
5908 | frame = get_current_frame (); | |
5909 | gdbarch = get_frame_arch (frame); | |
5910 | ||
2adfaa28 | 5911 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5912 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5913 | { |
af48d08f | 5914 | struct regcache *regcache; |
af48d08f | 5915 | CORE_ADDR pc; |
2adfaa28 | 5916 | |
00431a78 | 5917 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
5918 | const address_space *aspace = regcache->aspace (); |
5919 | ||
af48d08f | 5920 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 5921 | |
af48d08f PA |
5922 | /* However, before doing so, if this single-step breakpoint was |
5923 | actually for another thread, set this thread up for moving | |
5924 | past it. */ | |
5925 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5926 | aspace, pc)) | |
5927 | { | |
5928 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 | 5929 | { |
edbcda09 SM |
5930 | infrun_log_debug ("[%s] hit another thread's single-step " |
5931 | "breakpoint", | |
5932 | target_pid_to_str (ecs->ptid).c_str ()); | |
af48d08f PA |
5933 | ecs->hit_singlestep_breakpoint = 1; |
5934 | } | |
5935 | } | |
5936 | else | |
5937 | { | |
edbcda09 SM |
5938 | infrun_log_debug ("[%s] hit its single-step breakpoint", |
5939 | target_pid_to_str (ecs->ptid).c_str ()); | |
2adfaa28 | 5940 | } |
488f131b | 5941 | } |
af48d08f | 5942 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5943 | |
963f9c80 PA |
5944 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5945 | && ecs->event_thread->control.trap_expected | |
5946 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5947 | stopped_by_watchpoint = 0; |
5948 | else | |
5949 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5950 | ||
5951 | /* If necessary, step over this watchpoint. We'll be back to display | |
5952 | it in a moment. */ | |
5953 | if (stopped_by_watchpoint | |
d92524f1 | 5954 | && (target_have_steppable_watchpoint |
568d6575 | 5955 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5956 | { |
488f131b JB |
5957 | /* At this point, we are stopped at an instruction which has |
5958 | attempted to write to a piece of memory under control of | |
5959 | a watchpoint. The instruction hasn't actually executed | |
5960 | yet. If we were to evaluate the watchpoint expression | |
5961 | now, we would get the old value, and therefore no change | |
5962 | would seem to have occurred. | |
5963 | ||
5964 | In order to make watchpoints work `right', we really need | |
5965 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5966 | watchpoint expression. We do this by single-stepping the |
5967 | target. | |
5968 | ||
7f89fd65 | 5969 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5970 | it. For example, the PA can (with some kernel cooperation) |
5971 | single step over a watchpoint without disabling the watchpoint. | |
5972 | ||
5973 | It is far more common to need to disable a watchpoint to step | |
5974 | the inferior over it. If we have non-steppable watchpoints, | |
5975 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5976 | disable all watchpoints. |
5977 | ||
5978 | Any breakpoint at PC must also be stepped over -- if there's | |
5979 | one, it will have already triggered before the watchpoint | |
5980 | triggered, and we either already reported it to the user, or | |
5981 | it didn't cause a stop and we called keep_going. In either | |
5982 | case, if there was a breakpoint at PC, we must be trying to | |
5983 | step past it. */ | |
5984 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5985 | keep_going (ecs); | |
488f131b JB |
5986 | return; |
5987 | } | |
5988 | ||
4e1c45ea | 5989 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5990 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5991 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5992 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5993 | stop_print_frame = 1; |
488f131b | 5994 | stopped_by_random_signal = 0; |
ddfe970e | 5995 | bpstat stop_chain = NULL; |
488f131b | 5996 | |
edb3359d DJ |
5997 | /* Hide inlined functions starting here, unless we just performed stepi or |
5998 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5999 | inline function call sites). */ | |
16c381f0 | 6000 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 6001 | { |
00431a78 PA |
6002 | const address_space *aspace |
6003 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
6004 | |
6005 | /* skip_inline_frames is expensive, so we avoid it if we can | |
6006 | determine that the address is one where functions cannot have | |
6007 | been inlined. This improves performance with inferiors that | |
6008 | load a lot of shared libraries, because the solib event | |
6009 | breakpoint is defined as the address of a function (i.e. not | |
6010 | inline). Note that we have to check the previous PC as well | |
6011 | as the current one to catch cases when we have just | |
6012 | single-stepped off a breakpoint prior to reinstating it. | |
6013 | Note that we're assuming that the code we single-step to is | |
6014 | not inline, but that's not definitive: there's nothing | |
6015 | preventing the event breakpoint function from containing | |
6016 | inlined code, and the single-step ending up there. If the | |
6017 | user had set a breakpoint on that inlined code, the missing | |
6018 | skip_inline_frames call would break things. Fortunately | |
6019 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
6020 | if (!pc_at_non_inline_function (aspace, |
6021 | ecs->event_thread->suspend.stop_pc, | |
6022 | &ecs->ws) | |
a210c238 MR |
6023 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
6024 | && ecs->event_thread->control.trap_expected | |
6025 | && pc_at_non_inline_function (aspace, | |
6026 | ecs->event_thread->prev_pc, | |
09ac7c10 | 6027 | &ecs->ws))) |
1c5a993e | 6028 | { |
f2ffa92b PA |
6029 | stop_chain = build_bpstat_chain (aspace, |
6030 | ecs->event_thread->suspend.stop_pc, | |
6031 | &ecs->ws); | |
00431a78 | 6032 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
6033 | |
6034 | /* Re-fetch current thread's frame in case that invalidated | |
6035 | the frame cache. */ | |
6036 | frame = get_current_frame (); | |
6037 | gdbarch = get_frame_arch (frame); | |
6038 | } | |
0574c78f | 6039 | } |
edb3359d | 6040 | |
a493e3e2 | 6041 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 6042 | && ecs->event_thread->control.trap_expected |
568d6575 | 6043 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6044 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6045 | { |
b50d7442 | 6046 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6047 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6048 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6049 | with a delay slot. It needs to be stepped twice, once for |
6050 | the instruction and once for the delay slot. */ | |
6051 | int step_through_delay | |
568d6575 | 6052 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6053 | |
edbcda09 SM |
6054 | if (step_through_delay) |
6055 | infrun_log_debug ("step through delay"); | |
6056 | ||
16c381f0 JK |
6057 | if (ecs->event_thread->control.step_range_end == 0 |
6058 | && step_through_delay) | |
3352ef37 AC |
6059 | { |
6060 | /* The user issued a continue when stopped at a breakpoint. | |
6061 | Set up for another trap and get out of here. */ | |
4e1c45ea | 6062 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6063 | keep_going (ecs); |
6064 | return; | |
6065 | } | |
6066 | else if (step_through_delay) | |
6067 | { | |
6068 | /* The user issued a step when stopped at a breakpoint. | |
6069 | Maybe we should stop, maybe we should not - the delay | |
6070 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6071 | case, don't decide that here, just set |
6072 | ecs->stepping_over_breakpoint, making sure we | |
6073 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6074 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6075 | } |
6076 | } | |
6077 | ||
ab04a2af TT |
6078 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6079 | handles this event. */ | |
6080 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6081 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
6082 | ecs->event_thread->suspend.stop_pc, |
6083 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 6084 | |
ab04a2af TT |
6085 | /* Following in case break condition called a |
6086 | function. */ | |
6087 | stop_print_frame = 1; | |
73dd234f | 6088 | |
ab04a2af TT |
6089 | /* This is where we handle "moribund" watchpoints. Unlike |
6090 | software breakpoints traps, hardware watchpoint traps are | |
6091 | always distinguishable from random traps. If no high-level | |
6092 | watchpoint is associated with the reported stop data address | |
6093 | anymore, then the bpstat does not explain the signal --- | |
6094 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6095 | set. */ | |
6096 | ||
edbcda09 | 6097 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
47591c29 | 6098 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6099 | GDB_SIGNAL_TRAP) |
ab04a2af | 6100 | && stopped_by_watchpoint) |
edbcda09 SM |
6101 | { |
6102 | infrun_log_debug ("no user watchpoint explains watchpoint SIGTRAP, " | |
6103 | "ignoring"); | |
6104 | } | |
73dd234f | 6105 | |
bac7d97b | 6106 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6107 | at one stage in the past included checks for an inferior |
6108 | function call's call dummy's return breakpoint. The original | |
6109 | comment, that went with the test, read: | |
03cebad2 | 6110 | |
ab04a2af TT |
6111 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6112 | another signal besides SIGTRAP, so check here as well as | |
6113 | above.'' | |
73dd234f | 6114 | |
ab04a2af TT |
6115 | If someone ever tries to get call dummys on a |
6116 | non-executable stack to work (where the target would stop | |
6117 | with something like a SIGSEGV), then those tests might need | |
6118 | to be re-instated. Given, however, that the tests were only | |
6119 | enabled when momentary breakpoints were not being used, I | |
6120 | suspect that it won't be the case. | |
488f131b | 6121 | |
ab04a2af TT |
6122 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6123 | be necessary for call dummies on a non-executable stack on | |
6124 | SPARC. */ | |
488f131b | 6125 | |
bac7d97b | 6126 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6127 | random_signal |
6128 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
6129 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 6130 | |
1cf4d951 PA |
6131 | /* Maybe this was a trap for a software breakpoint that has since |
6132 | been removed. */ | |
6133 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6134 | { | |
5133a315 LM |
6135 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
6136 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
6137 | { |
6138 | struct regcache *regcache; | |
6139 | int decr_pc; | |
6140 | ||
6141 | /* Re-adjust PC to what the program would see if GDB was not | |
6142 | debugging it. */ | |
00431a78 | 6143 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6144 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6145 | if (decr_pc != 0) |
6146 | { | |
07036511 TT |
6147 | gdb::optional<scoped_restore_tmpl<int>> |
6148 | restore_operation_disable; | |
1cf4d951 PA |
6149 | |
6150 | if (record_full_is_used ()) | |
07036511 TT |
6151 | restore_operation_disable.emplace |
6152 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6153 | |
f2ffa92b PA |
6154 | regcache_write_pc (regcache, |
6155 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
6156 | } |
6157 | } | |
6158 | else | |
6159 | { | |
6160 | /* A delayed software breakpoint event. Ignore the trap. */ | |
edbcda09 | 6161 | infrun_log_debug ("delayed software breakpoint trap, ignoring"); |
1cf4d951 PA |
6162 | random_signal = 0; |
6163 | } | |
6164 | } | |
6165 | ||
6166 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6167 | has since been removed. */ | |
6168 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6169 | { | |
6170 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
edbcda09 SM |
6171 | infrun_log_debug ("delayed hardware breakpoint/watchpoint " |
6172 | "trap, ignoring"); | |
1cf4d951 PA |
6173 | random_signal = 0; |
6174 | } | |
6175 | ||
bac7d97b PA |
6176 | /* If not, perhaps stepping/nexting can. */ |
6177 | if (random_signal) | |
6178 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6179 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6180 | |
2adfaa28 PA |
6181 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6182 | thread. Single-step breakpoints are transparent to the | |
6183 | breakpoints module. */ | |
6184 | if (random_signal) | |
6185 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6186 | ||
bac7d97b PA |
6187 | /* No? Perhaps we got a moribund watchpoint. */ |
6188 | if (random_signal) | |
6189 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6190 | |
c65d6b55 PA |
6191 | /* Always stop if the user explicitly requested this thread to |
6192 | remain stopped. */ | |
6193 | if (ecs->event_thread->stop_requested) | |
6194 | { | |
6195 | random_signal = 1; | |
edbcda09 | 6196 | infrun_log_debug ("user-requested stop"); |
c65d6b55 PA |
6197 | } |
6198 | ||
488f131b JB |
6199 | /* For the program's own signals, act according to |
6200 | the signal handling tables. */ | |
6201 | ||
ce12b012 | 6202 | if (random_signal) |
488f131b JB |
6203 | { |
6204 | /* Signal not for debugging purposes. */ | |
5b6d1e4f | 6205 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
c9737c08 | 6206 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6207 | |
edbcda09 SM |
6208 | infrun_log_debug ("random signal (%s)", |
6209 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6210 | |
488f131b JB |
6211 | stopped_by_random_signal = 1; |
6212 | ||
252fbfc8 PA |
6213 | /* Always stop on signals if we're either just gaining control |
6214 | of the program, or the user explicitly requested this thread | |
6215 | to remain stopped. */ | |
d6b48e9c | 6216 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6217 | || ecs->event_thread->stop_requested |
24291992 | 6218 | || (!inf->detaching |
16c381f0 | 6219 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 6220 | { |
22bcd14b | 6221 | stop_waiting (ecs); |
488f131b JB |
6222 | return; |
6223 | } | |
b57bacec PA |
6224 | |
6225 | /* Notify observers the signal has "handle print" set. Note we | |
6226 | returned early above if stopping; normal_stop handles the | |
6227 | printing in that case. */ | |
6228 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6229 | { | |
6230 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6231 | target_terminal::ours_for_output (); |
76727919 | 6232 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 6233 | target_terminal::inferior (); |
b57bacec | 6234 | } |
488f131b JB |
6235 | |
6236 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6237 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6238 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6239 | |
f2ffa92b | 6240 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 6241 | && ecs->event_thread->control.trap_expected |
8358c15c | 6242 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6243 | { |
6244 | /* We were just starting a new sequence, attempting to | |
6245 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6246 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6247 | of the stepping range so GDB needs to remember to, when |
6248 | the signal handler returns, resume stepping off that | |
6249 | breakpoint. */ | |
6250 | /* To simplify things, "continue" is forced to use the same | |
6251 | code paths as single-step - set a breakpoint at the | |
6252 | signal return address and then, once hit, step off that | |
6253 | breakpoint. */ | |
edbcda09 | 6254 | infrun_log_debug ("signal arrived while stepping over breakpoint"); |
d3169d93 | 6255 | |
2c03e5be | 6256 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6257 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6258 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6259 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6260 | |
6261 | /* If we were nexting/stepping some other thread, switch to | |
6262 | it, so that we don't continue it, losing control. */ | |
6263 | if (!switch_back_to_stepped_thread (ecs)) | |
6264 | keep_going (ecs); | |
9d799f85 | 6265 | return; |
68f53502 | 6266 | } |
9d799f85 | 6267 | |
e5f8a7cc | 6268 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
6269 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6270 | ecs->event_thread) | |
e5f8a7cc | 6271 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 6272 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6273 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6274 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6275 | { |
6276 | /* The inferior is about to take a signal that will take it | |
6277 | out of the single step range. Set a breakpoint at the | |
6278 | current PC (which is presumably where the signal handler | |
6279 | will eventually return) and then allow the inferior to | |
6280 | run free. | |
6281 | ||
6282 | Note that this is only needed for a signal delivered | |
6283 | while in the single-step range. Nested signals aren't a | |
6284 | problem as they eventually all return. */ | |
edbcda09 | 6285 | infrun_log_debug ("signal may take us out of single-step range"); |
237fc4c9 | 6286 | |
372316f1 | 6287 | clear_step_over_info (); |
2c03e5be | 6288 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6289 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6290 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6291 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6292 | keep_going (ecs); |
6293 | return; | |
d303a6c7 | 6294 | } |
9d799f85 | 6295 | |
85102364 | 6296 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6297 | when either there's a nested signal, or when there's a |
6298 | pending signal enabled just as the signal handler returns | |
6299 | (leaving the inferior at the step-resume-breakpoint without | |
6300 | actually executing it). Either way continue until the | |
6301 | breakpoint is really hit. */ | |
c447ac0b PA |
6302 | |
6303 | if (!switch_back_to_stepped_thread (ecs)) | |
6304 | { | |
edbcda09 | 6305 | infrun_log_debug ("random signal, keep going"); |
c447ac0b PA |
6306 | |
6307 | keep_going (ecs); | |
6308 | } | |
6309 | return; | |
488f131b | 6310 | } |
94c57d6a PA |
6311 | |
6312 | process_event_stop_test (ecs); | |
6313 | } | |
6314 | ||
6315 | /* Come here when we've got some debug event / signal we can explain | |
6316 | (IOW, not a random signal), and test whether it should cause a | |
6317 | stop, or whether we should resume the inferior (transparently). | |
6318 | E.g., could be a breakpoint whose condition evaluates false; we | |
6319 | could be still stepping within the line; etc. */ | |
6320 | ||
6321 | static void | |
6322 | process_event_stop_test (struct execution_control_state *ecs) | |
6323 | { | |
6324 | struct symtab_and_line stop_pc_sal; | |
6325 | struct frame_info *frame; | |
6326 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6327 | CORE_ADDR jmp_buf_pc; |
6328 | struct bpstat_what what; | |
94c57d6a | 6329 | |
cdaa5b73 | 6330 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6331 | |
cdaa5b73 PA |
6332 | frame = get_current_frame (); |
6333 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6334 | |
cdaa5b73 | 6335 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6336 | |
cdaa5b73 PA |
6337 | if (what.call_dummy) |
6338 | { | |
6339 | stop_stack_dummy = what.call_dummy; | |
6340 | } | |
186c406b | 6341 | |
243a9253 PA |
6342 | /* A few breakpoint types have callbacks associated (e.g., |
6343 | bp_jit_event). Run them now. */ | |
6344 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6345 | ||
cdaa5b73 PA |
6346 | /* If we hit an internal event that triggers symbol changes, the |
6347 | current frame will be invalidated within bpstat_what (e.g., if we | |
6348 | hit an internal solib event). Re-fetch it. */ | |
6349 | frame = get_current_frame (); | |
6350 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6351 | |
cdaa5b73 PA |
6352 | switch (what.main_action) |
6353 | { | |
6354 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6355 | /* If we hit the breakpoint at longjmp while stepping, we | |
6356 | install a momentary breakpoint at the target of the | |
6357 | jmp_buf. */ | |
186c406b | 6358 | |
edbcda09 | 6359 | infrun_log_debug ("BPSTAT_WHAT_SET_LONGJMP_RESUME"); |
186c406b | 6360 | |
cdaa5b73 | 6361 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6362 | |
cdaa5b73 PA |
6363 | if (what.is_longjmp) |
6364 | { | |
6365 | struct value *arg_value; | |
6366 | ||
6367 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6368 | then use it to extract the arguments. The destination PC | |
6369 | is the third argument to the probe. */ | |
6370 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6371 | if (arg_value) | |
8fa0c4f8 AA |
6372 | { |
6373 | jmp_buf_pc = value_as_address (arg_value); | |
6374 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6375 | } | |
cdaa5b73 PA |
6376 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6377 | || !gdbarch_get_longjmp_target (gdbarch, | |
6378 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6379 | { |
edbcda09 SM |
6380 | infrun_log_debug ("BPSTAT_WHAT_SET_LONGJMP_RESUME " |
6381 | "(!gdbarch_get_longjmp_target)"); | |
cdaa5b73 PA |
6382 | keep_going (ecs); |
6383 | return; | |
e2e4d78b | 6384 | } |
e2e4d78b | 6385 | |
cdaa5b73 PA |
6386 | /* Insert a breakpoint at resume address. */ |
6387 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6388 | } | |
6389 | else | |
6390 | check_exception_resume (ecs, frame); | |
6391 | keep_going (ecs); | |
6392 | return; | |
e81a37f7 | 6393 | |
cdaa5b73 PA |
6394 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6395 | { | |
6396 | struct frame_info *init_frame; | |
e81a37f7 | 6397 | |
cdaa5b73 | 6398 | /* There are several cases to consider. |
c906108c | 6399 | |
cdaa5b73 PA |
6400 | 1. The initiating frame no longer exists. In this case we |
6401 | must stop, because the exception or longjmp has gone too | |
6402 | far. | |
2c03e5be | 6403 | |
cdaa5b73 PA |
6404 | 2. The initiating frame exists, and is the same as the |
6405 | current frame. We stop, because the exception or longjmp | |
6406 | has been caught. | |
2c03e5be | 6407 | |
cdaa5b73 PA |
6408 | 3. The initiating frame exists and is different from the |
6409 | current frame. This means the exception or longjmp has | |
6410 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6411 | |
cdaa5b73 PA |
6412 | 4. longjmp breakpoint has been placed just to protect |
6413 | against stale dummy frames and user is not interested in | |
6414 | stopping around longjmps. */ | |
c5aa993b | 6415 | |
edbcda09 | 6416 | infrun_log_debug ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME"); |
c5aa993b | 6417 | |
cdaa5b73 PA |
6418 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6419 | != NULL); | |
6420 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6421 | |
cdaa5b73 PA |
6422 | if (what.is_longjmp) |
6423 | { | |
b67a2c6f | 6424 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6425 | |
cdaa5b73 | 6426 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6427 | { |
cdaa5b73 PA |
6428 | /* Case 4. */ |
6429 | keep_going (ecs); | |
6430 | return; | |
e5ef252a | 6431 | } |
cdaa5b73 | 6432 | } |
c5aa993b | 6433 | |
cdaa5b73 | 6434 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6435 | |
cdaa5b73 PA |
6436 | if (init_frame) |
6437 | { | |
6438 | struct frame_id current_id | |
6439 | = get_frame_id (get_current_frame ()); | |
6440 | if (frame_id_eq (current_id, | |
6441 | ecs->event_thread->initiating_frame)) | |
6442 | { | |
6443 | /* Case 2. Fall through. */ | |
6444 | } | |
6445 | else | |
6446 | { | |
6447 | /* Case 3. */ | |
6448 | keep_going (ecs); | |
6449 | return; | |
6450 | } | |
68f53502 | 6451 | } |
488f131b | 6452 | |
cdaa5b73 PA |
6453 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6454 | exists. */ | |
6455 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6456 | |
bdc36728 | 6457 | end_stepping_range (ecs); |
cdaa5b73 PA |
6458 | } |
6459 | return; | |
e5ef252a | 6460 | |
cdaa5b73 | 6461 | case BPSTAT_WHAT_SINGLE: |
edbcda09 | 6462 | infrun_log_debug ("BPSTAT_WHAT_SINGLE"); |
cdaa5b73 PA |
6463 | ecs->event_thread->stepping_over_breakpoint = 1; |
6464 | /* Still need to check other stuff, at least the case where we | |
6465 | are stepping and step out of the right range. */ | |
6466 | break; | |
e5ef252a | 6467 | |
cdaa5b73 | 6468 | case BPSTAT_WHAT_STEP_RESUME: |
edbcda09 | 6469 | infrun_log_debug ("BPSTAT_WHAT_STEP_RESUME"); |
e5ef252a | 6470 | |
cdaa5b73 PA |
6471 | delete_step_resume_breakpoint (ecs->event_thread); |
6472 | if (ecs->event_thread->control.proceed_to_finish | |
6473 | && execution_direction == EXEC_REVERSE) | |
6474 | { | |
6475 | struct thread_info *tp = ecs->event_thread; | |
6476 | ||
6477 | /* We are finishing a function in reverse, and just hit the | |
6478 | step-resume breakpoint at the start address of the | |
6479 | function, and we're almost there -- just need to back up | |
6480 | by one more single-step, which should take us back to the | |
6481 | function call. */ | |
6482 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6483 | keep_going (ecs); | |
e5ef252a | 6484 | return; |
cdaa5b73 PA |
6485 | } |
6486 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6487 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6488 | && execution_direction == EXEC_REVERSE) |
6489 | { | |
6490 | /* We are stepping over a function call in reverse, and just | |
6491 | hit the step-resume breakpoint at the start address of | |
6492 | the function. Go back to single-stepping, which should | |
6493 | take us back to the function call. */ | |
6494 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6495 | keep_going (ecs); | |
6496 | return; | |
6497 | } | |
6498 | break; | |
e5ef252a | 6499 | |
cdaa5b73 | 6500 | case BPSTAT_WHAT_STOP_NOISY: |
edbcda09 | 6501 | infrun_log_debug ("BPSTAT_WHAT_STOP_NOISY"); |
cdaa5b73 | 6502 | stop_print_frame = 1; |
e5ef252a | 6503 | |
99619bea PA |
6504 | /* Assume the thread stopped for a breapoint. We'll still check |
6505 | whether a/the breakpoint is there when the thread is next | |
6506 | resumed. */ | |
6507 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6508 | |
22bcd14b | 6509 | stop_waiting (ecs); |
cdaa5b73 | 6510 | return; |
e5ef252a | 6511 | |
cdaa5b73 | 6512 | case BPSTAT_WHAT_STOP_SILENT: |
edbcda09 | 6513 | infrun_log_debug ("BPSTAT_WHAT_STOP_SILENT"); |
cdaa5b73 | 6514 | stop_print_frame = 0; |
e5ef252a | 6515 | |
99619bea PA |
6516 | /* Assume the thread stopped for a breapoint. We'll still check |
6517 | whether a/the breakpoint is there when the thread is next | |
6518 | resumed. */ | |
6519 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6520 | stop_waiting (ecs); |
cdaa5b73 PA |
6521 | return; |
6522 | ||
6523 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
edbcda09 | 6524 | infrun_log_debug ("BPSTAT_WHAT_HP_STEP_RESUME"); |
cdaa5b73 PA |
6525 | |
6526 | delete_step_resume_breakpoint (ecs->event_thread); | |
6527 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6528 | { | |
6529 | /* Back when the step-resume breakpoint was inserted, we | |
6530 | were trying to single-step off a breakpoint. Go back to | |
6531 | doing that. */ | |
6532 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6533 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6534 | keep_going (ecs); | |
6535 | return; | |
e5ef252a | 6536 | } |
cdaa5b73 PA |
6537 | break; |
6538 | ||
6539 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6540 | break; | |
e5ef252a | 6541 | } |
c906108c | 6542 | |
af48d08f PA |
6543 | /* If we stepped a permanent breakpoint and we had a high priority |
6544 | step-resume breakpoint for the address we stepped, but we didn't | |
6545 | hit it, then we must have stepped into the signal handler. The | |
6546 | step-resume was only necessary to catch the case of _not_ | |
6547 | stepping into the handler, so delete it, and fall through to | |
6548 | checking whether the step finished. */ | |
6549 | if (ecs->event_thread->stepped_breakpoint) | |
6550 | { | |
6551 | struct breakpoint *sr_bp | |
6552 | = ecs->event_thread->control.step_resume_breakpoint; | |
6553 | ||
8d707a12 PA |
6554 | if (sr_bp != NULL |
6555 | && sr_bp->loc->permanent | |
af48d08f PA |
6556 | && sr_bp->type == bp_hp_step_resume |
6557 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6558 | { | |
edbcda09 | 6559 | infrun_log_debug ("stepped permanent breakpoint, stopped in handler"); |
af48d08f PA |
6560 | delete_step_resume_breakpoint (ecs->event_thread); |
6561 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6562 | } | |
6563 | } | |
6564 | ||
cdaa5b73 PA |
6565 | /* We come here if we hit a breakpoint but should not stop for it. |
6566 | Possibly we also were stepping and should stop for that. So fall | |
6567 | through and test for stepping. But, if not stepping, do not | |
6568 | stop. */ | |
c906108c | 6569 | |
a7212384 UW |
6570 | /* In all-stop mode, if we're currently stepping but have stopped in |
6571 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6572 | if (switch_back_to_stepped_thread (ecs)) |
6573 | return; | |
776f04fa | 6574 | |
8358c15c | 6575 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6576 | { |
edbcda09 | 6577 | infrun_log_debug ("step-resume breakpoint is inserted"); |
527159b7 | 6578 | |
488f131b JB |
6579 | /* Having a step-resume breakpoint overrides anything |
6580 | else having to do with stepping commands until | |
6581 | that breakpoint is reached. */ | |
488f131b JB |
6582 | keep_going (ecs); |
6583 | return; | |
6584 | } | |
c5aa993b | 6585 | |
16c381f0 | 6586 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6587 | { |
edbcda09 | 6588 | infrun_log_debug ("no stepping, continue"); |
488f131b | 6589 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6590 | keep_going (ecs); |
6591 | return; | |
6592 | } | |
c5aa993b | 6593 | |
4b7703ad JB |
6594 | /* Re-fetch current thread's frame in case the code above caused |
6595 | the frame cache to be re-initialized, making our FRAME variable | |
6596 | a dangling pointer. */ | |
6597 | frame = get_current_frame (); | |
628fe4e4 | 6598 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6599 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6600 | |
488f131b | 6601 | /* If stepping through a line, keep going if still within it. |
c906108c | 6602 | |
488f131b JB |
6603 | Note that step_range_end is the address of the first instruction |
6604 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6605 | within it! |
6606 | ||
6607 | Note also that during reverse execution, we may be stepping | |
6608 | through a function epilogue and therefore must detect when | |
6609 | the current-frame changes in the middle of a line. */ | |
6610 | ||
f2ffa92b PA |
6611 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6612 | ecs->event_thread) | |
31410e84 | 6613 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6614 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6615 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6616 | { |
edbcda09 SM |
6617 | infrun_log_debug |
6618 | ("stepping inside range [%s-%s]", | |
6619 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
6620 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6621 | |
c1e36e3e PA |
6622 | /* Tentatively re-enable range stepping; `resume' disables it if |
6623 | necessary (e.g., if we're stepping over a breakpoint or we | |
6624 | have software watchpoints). */ | |
6625 | ecs->event_thread->control.may_range_step = 1; | |
6626 | ||
b2175913 MS |
6627 | /* When stepping backward, stop at beginning of line range |
6628 | (unless it's the function entry point, in which case | |
6629 | keep going back to the call point). */ | |
f2ffa92b | 6630 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6631 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6632 | && stop_pc != ecs->stop_func_start |
6633 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6634 | end_stepping_range (ecs); |
b2175913 MS |
6635 | else |
6636 | keep_going (ecs); | |
6637 | ||
488f131b JB |
6638 | return; |
6639 | } | |
c5aa993b | 6640 | |
488f131b | 6641 | /* We stepped out of the stepping range. */ |
c906108c | 6642 | |
488f131b | 6643 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6644 | loader dynamic symbol resolution code... |
6645 | ||
6646 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6647 | time loader code and reach the callee's address. | |
6648 | ||
6649 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6650 | the runtime loader code is handled just like any other | |
6651 | undebuggable function call. Now we need only keep stepping | |
6652 | backward through the trampoline code, and that's handled further | |
6653 | down, so there is nothing for us to do here. */ | |
6654 | ||
6655 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6656 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6657 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6658 | { |
4c8c40e6 | 6659 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6660 | gdbarch_skip_solib_resolver (gdbarch, |
6661 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6662 | |
edbcda09 | 6663 | infrun_log_debug ("stepped into dynsym resolve code"); |
527159b7 | 6664 | |
488f131b JB |
6665 | if (pc_after_resolver) |
6666 | { | |
6667 | /* Set up a step-resume breakpoint at the address | |
6668 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6669 | symtab_and_line sr_sal; |
488f131b | 6670 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6671 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6672 | |
a6d9a66e UW |
6673 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6674 | sr_sal, null_frame_id); | |
c5aa993b | 6675 | } |
c906108c | 6676 | |
488f131b JB |
6677 | keep_going (ecs); |
6678 | return; | |
6679 | } | |
c906108c | 6680 | |
1d509aa6 MM |
6681 | /* Step through an indirect branch thunk. */ |
6682 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6683 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6684 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 | 6685 | { |
edbcda09 | 6686 | infrun_log_debug ("stepped into indirect branch thunk"); |
1d509aa6 MM |
6687 | keep_going (ecs); |
6688 | return; | |
6689 | } | |
6690 | ||
16c381f0 JK |
6691 | if (ecs->event_thread->control.step_range_end != 1 |
6692 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6693 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6694 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6695 | { |
edbcda09 | 6696 | infrun_log_debug ("stepped into signal trampoline"); |
42edda50 | 6697 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6698 | a signal trampoline (either by a signal being delivered or by |
6699 | the signal handler returning). Just single-step until the | |
6700 | inferior leaves the trampoline (either by calling the handler | |
6701 | or returning). */ | |
488f131b JB |
6702 | keep_going (ecs); |
6703 | return; | |
6704 | } | |
c906108c | 6705 | |
14132e89 MR |
6706 | /* If we're in the return path from a shared library trampoline, |
6707 | we want to proceed through the trampoline when stepping. */ | |
6708 | /* macro/2012-04-25: This needs to come before the subroutine | |
6709 | call check below as on some targets return trampolines look | |
6710 | like subroutine calls (MIPS16 return thunks). */ | |
6711 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
6712 | ecs->event_thread->suspend.stop_pc, |
6713 | ecs->stop_func_name) | |
14132e89 MR |
6714 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6715 | { | |
6716 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
6717 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6718 | CORE_ADDR real_stop_pc | |
6719 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 | 6720 | |
edbcda09 | 6721 | infrun_log_debug ("stepped into solib return tramp"); |
14132e89 MR |
6722 | |
6723 | /* Only proceed through if we know where it's going. */ | |
6724 | if (real_stop_pc) | |
6725 | { | |
6726 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6727 | symtab_and_line sr_sal; |
14132e89 MR |
6728 | sr_sal.pc = real_stop_pc; |
6729 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6730 | sr_sal.pspace = get_frame_program_space (frame); | |
6731 | ||
6732 | /* Do not specify what the fp should be when we stop since | |
6733 | on some machines the prologue is where the new fp value | |
6734 | is established. */ | |
6735 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6736 | sr_sal, null_frame_id); | |
6737 | ||
6738 | /* Restart without fiddling with the step ranges or | |
6739 | other state. */ | |
6740 | keep_going (ecs); | |
6741 | return; | |
6742 | } | |
6743 | } | |
6744 | ||
c17eaafe DJ |
6745 | /* Check for subroutine calls. The check for the current frame |
6746 | equalling the step ID is not necessary - the check of the | |
6747 | previous frame's ID is sufficient - but it is a common case and | |
6748 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6749 | |
6750 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6751 | being equal, so to get into this block, both the current and | |
6752 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6753 | /* The outer_frame_id check is a heuristic to detect stepping |
6754 | through startup code. If we step over an instruction which | |
6755 | sets the stack pointer from an invalid value to a valid value, | |
6756 | we may detect that as a subroutine call from the mythical | |
6757 | "outermost" function. This could be fixed by marking | |
6758 | outermost frames as !stack_p,code_p,special_p. Then the | |
6759 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6760 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6761 | for more. */ |
edb3359d | 6762 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6763 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6764 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6765 | ecs->event_thread->control.step_stack_frame_id) |
6766 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6767 | outer_frame_id) |
885eeb5b | 6768 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 6769 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 6770 | { |
f2ffa92b | 6771 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 6772 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6773 | |
edbcda09 | 6774 | infrun_log_debug ("stepped into subroutine"); |
527159b7 | 6775 | |
b7a084be | 6776 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6777 | { |
6778 | /* I presume that step_over_calls is only 0 when we're | |
6779 | supposed to be stepping at the assembly language level | |
6780 | ("stepi"). Just stop. */ | |
388a8562 | 6781 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6782 | end_stepping_range (ecs); |
95918acb AC |
6783 | return; |
6784 | } | |
8fb3e588 | 6785 | |
388a8562 MS |
6786 | /* Reverse stepping through solib trampolines. */ |
6787 | ||
6788 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6789 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6790 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6791 | || (ecs->stop_func_start == 0 | |
6792 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6793 | { | |
6794 | /* Any solib trampoline code can be handled in reverse | |
6795 | by simply continuing to single-step. We have already | |
6796 | executed the solib function (backwards), and a few | |
6797 | steps will take us back through the trampoline to the | |
6798 | caller. */ | |
6799 | keep_going (ecs); | |
6800 | return; | |
6801 | } | |
6802 | ||
16c381f0 | 6803 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6804 | { |
b2175913 MS |
6805 | /* We're doing a "next". |
6806 | ||
6807 | Normal (forward) execution: set a breakpoint at the | |
6808 | callee's return address (the address at which the caller | |
6809 | will resume). | |
6810 | ||
6811 | Reverse (backward) execution. set the step-resume | |
6812 | breakpoint at the start of the function that we just | |
6813 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6814 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6815 | |
6816 | if (execution_direction == EXEC_REVERSE) | |
6817 | { | |
acf9414f JK |
6818 | /* If we're already at the start of the function, we've either |
6819 | just stepped backward into a single instruction function, | |
6820 | or stepped back out of a signal handler to the first instruction | |
6821 | of the function. Just keep going, which will single-step back | |
6822 | to the caller. */ | |
58c48e72 | 6823 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6824 | { |
acf9414f | 6825 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6826 | symtab_and_line sr_sal; |
acf9414f JK |
6827 | sr_sal.pc = ecs->stop_func_start; |
6828 | sr_sal.pspace = get_frame_program_space (frame); | |
6829 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6830 | sr_sal, null_frame_id); | |
6831 | } | |
b2175913 MS |
6832 | } |
6833 | else | |
568d6575 | 6834 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6835 | |
8567c30f AC |
6836 | keep_going (ecs); |
6837 | return; | |
6838 | } | |
a53c66de | 6839 | |
95918acb | 6840 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6841 | calling routine and the real function), locate the real |
6842 | function. That's what tells us (a) whether we want to step | |
6843 | into it at all, and (b) what prologue we want to run to the | |
6844 | end of, if we do step into it. */ | |
568d6575 | 6845 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6846 | if (real_stop_pc == 0) |
568d6575 | 6847 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6848 | if (real_stop_pc != 0) |
6849 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6850 | |
db5f024e | 6851 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6852 | { |
51abb421 | 6853 | symtab_and_line sr_sal; |
1b2bfbb9 | 6854 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6855 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6856 | |
a6d9a66e UW |
6857 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6858 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6859 | keep_going (ecs); |
6860 | return; | |
1b2bfbb9 RC |
6861 | } |
6862 | ||
95918acb | 6863 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6864 | thinking of stepping into and the function isn't on the skip |
6865 | list, step into it. | |
95918acb | 6866 | |
8fb3e588 AC |
6867 | If there are several symtabs at that PC (e.g. with include |
6868 | files), just want to know whether *any* of them have line | |
6869 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6870 | { |
6871 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6872 | |
95918acb | 6873 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6874 | if (tmp_sal.line != 0 |
85817405 | 6875 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
6876 | tmp_sal) |
6877 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 6878 | { |
b2175913 | 6879 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6880 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6881 | else |
568d6575 | 6882 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6883 | return; |
6884 | } | |
6885 | } | |
6886 | ||
6887 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6888 | set, we stop the step so that the user has a chance to switch |
6889 | in assembly mode. */ | |
16c381f0 | 6890 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6891 | && step_stop_if_no_debug) |
95918acb | 6892 | { |
bdc36728 | 6893 | end_stepping_range (ecs); |
95918acb AC |
6894 | return; |
6895 | } | |
6896 | ||
b2175913 MS |
6897 | if (execution_direction == EXEC_REVERSE) |
6898 | { | |
acf9414f JK |
6899 | /* If we're already at the start of the function, we've either just |
6900 | stepped backward into a single instruction function without line | |
6901 | number info, or stepped back out of a signal handler to the first | |
6902 | instruction of the function without line number info. Just keep | |
6903 | going, which will single-step back to the caller. */ | |
6904 | if (ecs->stop_func_start != stop_pc) | |
6905 | { | |
6906 | /* Set a breakpoint at callee's start address. | |
6907 | From there we can step once and be back in the caller. */ | |
51abb421 | 6908 | symtab_and_line sr_sal; |
acf9414f JK |
6909 | sr_sal.pc = ecs->stop_func_start; |
6910 | sr_sal.pspace = get_frame_program_space (frame); | |
6911 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6912 | sr_sal, null_frame_id); | |
6913 | } | |
b2175913 MS |
6914 | } |
6915 | else | |
6916 | /* Set a breakpoint at callee's return address (the address | |
6917 | at which the caller will resume). */ | |
568d6575 | 6918 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6919 | |
95918acb | 6920 | keep_going (ecs); |
488f131b | 6921 | return; |
488f131b | 6922 | } |
c906108c | 6923 | |
fdd654f3 MS |
6924 | /* Reverse stepping through solib trampolines. */ |
6925 | ||
6926 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6927 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 6928 | { |
f2ffa92b PA |
6929 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6930 | ||
fdd654f3 MS |
6931 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6932 | || (ecs->stop_func_start == 0 | |
6933 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6934 | { | |
6935 | /* Any solib trampoline code can be handled in reverse | |
6936 | by simply continuing to single-step. We have already | |
6937 | executed the solib function (backwards), and a few | |
6938 | steps will take us back through the trampoline to the | |
6939 | caller. */ | |
6940 | keep_going (ecs); | |
6941 | return; | |
6942 | } | |
6943 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6944 | { | |
6945 | /* Stepped backward into the solib dynsym resolver. | |
6946 | Set a breakpoint at its start and continue, then | |
6947 | one more step will take us out. */ | |
51abb421 | 6948 | symtab_and_line sr_sal; |
fdd654f3 | 6949 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 6950 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6951 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6952 | sr_sal, null_frame_id); | |
6953 | keep_going (ecs); | |
6954 | return; | |
6955 | } | |
6956 | } | |
6957 | ||
8c95582d AB |
6958 | /* This always returns the sal for the inner-most frame when we are in a |
6959 | stack of inlined frames, even if GDB actually believes that it is in a | |
6960 | more outer frame. This is checked for below by calls to | |
6961 | inline_skipped_frames. */ | |
f2ffa92b | 6962 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 6963 | |
1b2bfbb9 RC |
6964 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6965 | the trampoline processing logic, however, there are some trampolines | |
6966 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6967 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6968 | && ecs->stop_func_name == NULL |
2afb61aa | 6969 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6970 | { |
edbcda09 | 6971 | infrun_log_debug ("stepped into undebuggable function"); |
527159b7 | 6972 | |
1b2bfbb9 | 6973 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6974 | undebuggable function (where there is no debugging information |
6975 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6976 | inferior stopped). Since we want to skip this kind of code, |
6977 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6978 | function - unless the user has asked us not to (via |
6979 | set step-mode) or we no longer know how to get back | |
6980 | to the call site. */ | |
6981 | if (step_stop_if_no_debug | |
c7ce8faa | 6982 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6983 | { |
6984 | /* If we have no line number and the step-stop-if-no-debug | |
6985 | is set, we stop the step so that the user has a chance to | |
6986 | switch in assembly mode. */ | |
bdc36728 | 6987 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6988 | return; |
6989 | } | |
6990 | else | |
6991 | { | |
6992 | /* Set a breakpoint at callee's return address (the address | |
6993 | at which the caller will resume). */ | |
568d6575 | 6994 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6995 | keep_going (ecs); |
6996 | return; | |
6997 | } | |
6998 | } | |
6999 | ||
16c381f0 | 7000 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
7001 | { |
7002 | /* It is stepi or nexti. We always want to stop stepping after | |
7003 | one instruction. */ | |
edbcda09 | 7004 | infrun_log_debug ("stepi/nexti"); |
bdc36728 | 7005 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7006 | return; |
7007 | } | |
7008 | ||
2afb61aa | 7009 | if (stop_pc_sal.line == 0) |
488f131b JB |
7010 | { |
7011 | /* We have no line number information. That means to stop | |
7012 | stepping (does this always happen right after one instruction, | |
7013 | when we do "s" in a function with no line numbers, | |
7014 | or can this happen as a result of a return or longjmp?). */ | |
edbcda09 | 7015 | infrun_log_debug ("line number info"); |
bdc36728 | 7016 | end_stepping_range (ecs); |
488f131b JB |
7017 | return; |
7018 | } | |
c906108c | 7019 | |
edb3359d DJ |
7020 | /* Look for "calls" to inlined functions, part one. If the inline |
7021 | frame machinery detected some skipped call sites, we have entered | |
7022 | a new inline function. */ | |
7023 | ||
7024 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7025 | ecs->event_thread->control.step_frame_id) |
00431a78 | 7026 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 7027 | { |
edbcda09 | 7028 | infrun_log_debug ("stepped into inlined function"); |
edb3359d | 7029 | |
51abb421 | 7030 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 7031 | |
16c381f0 | 7032 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
7033 | { |
7034 | /* For "step", we're going to stop. But if the call site | |
7035 | for this inlined function is on the same source line as | |
7036 | we were previously stepping, go down into the function | |
7037 | first. Otherwise stop at the call site. */ | |
7038 | ||
7039 | if (call_sal.line == ecs->event_thread->current_line | |
7040 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7041 | { |
7042 | step_into_inline_frame (ecs->event_thread); | |
7043 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7044 | { | |
7045 | keep_going (ecs); | |
7046 | return; | |
7047 | } | |
7048 | } | |
edb3359d | 7049 | |
bdc36728 | 7050 | end_stepping_range (ecs); |
edb3359d DJ |
7051 | return; |
7052 | } | |
7053 | else | |
7054 | { | |
7055 | /* For "next", we should stop at the call site if it is on a | |
7056 | different source line. Otherwise continue through the | |
7057 | inlined function. */ | |
7058 | if (call_sal.line == ecs->event_thread->current_line | |
7059 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7060 | keep_going (ecs); | |
7061 | else | |
bdc36728 | 7062 | end_stepping_range (ecs); |
edb3359d DJ |
7063 | return; |
7064 | } | |
7065 | } | |
7066 | ||
7067 | /* Look for "calls" to inlined functions, part two. If we are still | |
7068 | in the same real function we were stepping through, but we have | |
7069 | to go further up to find the exact frame ID, we are stepping | |
7070 | through a more inlined call beyond its call site. */ | |
7071 | ||
7072 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
7073 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7074 | ecs->event_thread->control.step_frame_id) |
edb3359d | 7075 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7076 | ecs->event_thread->control.step_frame_id)) |
edb3359d | 7077 | { |
edbcda09 | 7078 | infrun_log_debug ("stepping through inlined function"); |
edb3359d | 7079 | |
4a4c04f1 BE |
7080 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7081 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7082 | keep_going (ecs); |
7083 | else | |
bdc36728 | 7084 | end_stepping_range (ecs); |
edb3359d DJ |
7085 | return; |
7086 | } | |
7087 | ||
8c95582d | 7088 | bool refresh_step_info = true; |
f2ffa92b | 7089 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
7090 | && (ecs->event_thread->current_line != stop_pc_sal.line |
7091 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b | 7092 | { |
8c95582d AB |
7093 | if (stop_pc_sal.is_stmt) |
7094 | { | |
7095 | /* We are at the start of a different line. So stop. Note that | |
7096 | we don't stop if we step into the middle of a different line. | |
7097 | That is said to make things like for (;;) statements work | |
7098 | better. */ | |
edbcda09 | 7099 | infrun_log_debug ("infrun: stepped to a different line\n"); |
8c95582d AB |
7100 | end_stepping_range (ecs); |
7101 | return; | |
7102 | } | |
7103 | else if (frame_id_eq (get_frame_id (get_current_frame ()), | |
7104 | ecs->event_thread->control.step_frame_id)) | |
7105 | { | |
7106 | /* We are at the start of a different line, however, this line is | |
7107 | not marked as a statement, and we have not changed frame. We | |
7108 | ignore this line table entry, and continue stepping forward, | |
7109 | looking for a better place to stop. */ | |
7110 | refresh_step_info = false; | |
edbcda09 SM |
7111 | infrun_log_debug ("infrun: stepped to a different line, but " |
7112 | "it's not the start of a statement\n"); | |
8c95582d | 7113 | } |
488f131b | 7114 | } |
c906108c | 7115 | |
488f131b | 7116 | /* We aren't done stepping. |
c906108c | 7117 | |
488f131b JB |
7118 | Optimize by setting the stepping range to the line. |
7119 | (We might not be in the original line, but if we entered a | |
7120 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7121 | things like for(;;) statements work better.) |
7122 | ||
7123 | If we entered a SAL that indicates a non-statement line table entry, | |
7124 | then we update the stepping range, but we don't update the step info, | |
7125 | which includes things like the line number we are stepping away from. | |
7126 | This means we will stop when we find a line table entry that is marked | |
7127 | as is-statement, even if it matches the non-statement one we just | |
7128 | stepped into. */ | |
c906108c | 7129 | |
16c381f0 JK |
7130 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7131 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7132 | ecs->event_thread->control.may_range_step = 1; |
8c95582d AB |
7133 | if (refresh_step_info) |
7134 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7135 | |
edbcda09 | 7136 | infrun_log_debug ("keep going"); |
488f131b | 7137 | keep_going (ecs); |
104c1213 JM |
7138 | } |
7139 | ||
c447ac0b PA |
7140 | /* In all-stop mode, if we're currently stepping but have stopped in |
7141 | some other thread, we may need to switch back to the stepped | |
7142 | thread. Returns true we set the inferior running, false if we left | |
7143 | it stopped (and the event needs further processing). */ | |
7144 | ||
7145 | static int | |
7146 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
7147 | { | |
fbea99ea | 7148 | if (!target_is_non_stop_p ()) |
c447ac0b | 7149 | { |
99619bea PA |
7150 | struct thread_info *stepping_thread; |
7151 | ||
7152 | /* If any thread is blocked on some internal breakpoint, and we | |
7153 | simply need to step over that breakpoint to get it going | |
7154 | again, do that first. */ | |
7155 | ||
7156 | /* However, if we see an event for the stepping thread, then we | |
7157 | know all other threads have been moved past their breakpoints | |
7158 | already. Let the caller check whether the step is finished, | |
7159 | etc., before deciding to move it past a breakpoint. */ | |
7160 | if (ecs->event_thread->control.step_range_end != 0) | |
7161 | return 0; | |
7162 | ||
7163 | /* Check if the current thread is blocked on an incomplete | |
7164 | step-over, interrupted by a random signal. */ | |
7165 | if (ecs->event_thread->control.trap_expected | |
7166 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7167 | { |
edbcda09 SM |
7168 | infrun_log_debug ("need to finish step-over of [%s]", |
7169 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
99619bea PA |
7170 | keep_going (ecs); |
7171 | return 1; | |
7172 | } | |
2adfaa28 | 7173 | |
99619bea PA |
7174 | /* Check if the current thread is blocked by a single-step |
7175 | breakpoint of another thread. */ | |
7176 | if (ecs->hit_singlestep_breakpoint) | |
7177 | { | |
edbcda09 SM |
7178 | infrun_log_debug ("need to step [%s] over single-step breakpoint", |
7179 | target_pid_to_str (ecs->ptid).c_str ()); | |
99619bea PA |
7180 | keep_going (ecs); |
7181 | return 1; | |
7182 | } | |
7183 | ||
4d9d9d04 PA |
7184 | /* If this thread needs yet another step-over (e.g., stepping |
7185 | through a delay slot), do it first before moving on to | |
7186 | another thread. */ | |
7187 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7188 | { | |
edbcda09 SM |
7189 | infrun_log_debug |
7190 | ("thread [%s] still needs step-over", | |
7191 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
4d9d9d04 PA |
7192 | keep_going (ecs); |
7193 | return 1; | |
7194 | } | |
70509625 | 7195 | |
483805cf PA |
7196 | /* If scheduler locking applies even if not stepping, there's no |
7197 | need to walk over threads. Above we've checked whether the | |
7198 | current thread is stepping. If some other thread not the | |
7199 | event thread is stepping, then it must be that scheduler | |
7200 | locking is not in effect. */ | |
856e7dd6 | 7201 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
7202 | return 0; |
7203 | ||
4d9d9d04 PA |
7204 | /* Otherwise, we no longer expect a trap in the current thread. |
7205 | Clear the trap_expected flag before switching back -- this is | |
7206 | what keep_going does as well, if we call it. */ | |
7207 | ecs->event_thread->control.trap_expected = 0; | |
7208 | ||
7209 | /* Likewise, clear the signal if it should not be passed. */ | |
7210 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7211 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7212 | ||
7213 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 7214 | step/next/etc. */ |
4d9d9d04 PA |
7215 | if (start_step_over ()) |
7216 | { | |
7217 | prepare_to_wait (ecs); | |
7218 | return 1; | |
7219 | } | |
7220 | ||
7221 | /* Look for the stepping/nexting thread. */ | |
483805cf | 7222 | stepping_thread = NULL; |
4d9d9d04 | 7223 | |
08036331 | 7224 | for (thread_info *tp : all_non_exited_threads ()) |
483805cf | 7225 | { |
f3f8ece4 PA |
7226 | switch_to_thread_no_regs (tp); |
7227 | ||
fbea99ea PA |
7228 | /* Ignore threads of processes the caller is not |
7229 | resuming. */ | |
483805cf | 7230 | if (!sched_multi |
5b6d1e4f PA |
7231 | && (tp->inf->process_target () != ecs->target |
7232 | || tp->inf->pid != ecs->ptid.pid ())) | |
483805cf PA |
7233 | continue; |
7234 | ||
7235 | /* When stepping over a breakpoint, we lock all threads | |
7236 | except the one that needs to move past the breakpoint. | |
7237 | If a non-event thread has this set, the "incomplete | |
7238 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
7239 | if (tp->control.trap_expected) |
7240 | { | |
7241 | internal_error (__FILE__, __LINE__, | |
7242 | "[%s] has inconsistent state: " | |
7243 | "trap_expected=%d\n", | |
a068643d | 7244 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
7245 | tp->control.trap_expected); |
7246 | } | |
483805cf PA |
7247 | |
7248 | /* Did we find the stepping thread? */ | |
7249 | if (tp->control.step_range_end) | |
7250 | { | |
7251 | /* Yep. There should only one though. */ | |
7252 | gdb_assert (stepping_thread == NULL); | |
7253 | ||
7254 | /* The event thread is handled at the top, before we | |
7255 | enter this loop. */ | |
7256 | gdb_assert (tp != ecs->event_thread); | |
7257 | ||
7258 | /* If some thread other than the event thread is | |
7259 | stepping, then scheduler locking can't be in effect, | |
7260 | otherwise we wouldn't have resumed the current event | |
7261 | thread in the first place. */ | |
856e7dd6 | 7262 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
7263 | |
7264 | stepping_thread = tp; | |
7265 | } | |
99619bea PA |
7266 | } |
7267 | ||
483805cf | 7268 | if (stepping_thread != NULL) |
99619bea | 7269 | { |
edbcda09 | 7270 | infrun_log_debug ("switching back to stepped thread"); |
c447ac0b | 7271 | |
2ac7589c PA |
7272 | if (keep_going_stepped_thread (stepping_thread)) |
7273 | { | |
7274 | prepare_to_wait (ecs); | |
7275 | return 1; | |
7276 | } | |
7277 | } | |
f3f8ece4 PA |
7278 | |
7279 | switch_to_thread (ecs->event_thread); | |
2ac7589c | 7280 | } |
2adfaa28 | 7281 | |
2ac7589c PA |
7282 | return 0; |
7283 | } | |
2adfaa28 | 7284 | |
2ac7589c PA |
7285 | /* Set a previously stepped thread back to stepping. Returns true on |
7286 | success, false if the resume is not possible (e.g., the thread | |
7287 | vanished). */ | |
7288 | ||
7289 | static int | |
7290 | keep_going_stepped_thread (struct thread_info *tp) | |
7291 | { | |
7292 | struct frame_info *frame; | |
2ac7589c PA |
7293 | struct execution_control_state ecss; |
7294 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7295 | |
2ac7589c PA |
7296 | /* If the stepping thread exited, then don't try to switch back and |
7297 | resume it, which could fail in several different ways depending | |
7298 | on the target. Instead, just keep going. | |
2adfaa28 | 7299 | |
2ac7589c PA |
7300 | We can find a stepping dead thread in the thread list in two |
7301 | cases: | |
2adfaa28 | 7302 | |
2ac7589c PA |
7303 | - The target supports thread exit events, and when the target |
7304 | tries to delete the thread from the thread list, inferior_ptid | |
7305 | pointed at the exiting thread. In such case, calling | |
7306 | delete_thread does not really remove the thread from the list; | |
7307 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7308 | |
2ac7589c PA |
7309 | - The target's debug interface does not support thread exit |
7310 | events, and so we have no idea whatsoever if the previously | |
7311 | stepping thread is still alive. For that reason, we need to | |
7312 | synchronously query the target now. */ | |
2adfaa28 | 7313 | |
00431a78 | 7314 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c | 7315 | { |
edbcda09 SM |
7316 | infrun_log_debug ("not resuming previously stepped thread, it has " |
7317 | "vanished"); | |
2ac7589c | 7318 | |
00431a78 | 7319 | delete_thread (tp); |
2ac7589c | 7320 | return 0; |
c447ac0b | 7321 | } |
2ac7589c | 7322 | |
edbcda09 | 7323 | infrun_log_debug ("resuming previously stepped thread"); |
2ac7589c PA |
7324 | |
7325 | reset_ecs (ecs, tp); | |
00431a78 | 7326 | switch_to_thread (tp); |
2ac7589c | 7327 | |
f2ffa92b | 7328 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 7329 | frame = get_current_frame (); |
2ac7589c PA |
7330 | |
7331 | /* If the PC of the thread we were trying to single-step has | |
7332 | changed, then that thread has trapped or been signaled, but the | |
7333 | event has not been reported to GDB yet. Re-poll the target | |
7334 | looking for this particular thread's event (i.e. temporarily | |
7335 | enable schedlock) by: | |
7336 | ||
7337 | - setting a break at the current PC | |
7338 | - resuming that particular thread, only (by setting trap | |
7339 | expected) | |
7340 | ||
7341 | This prevents us continuously moving the single-step breakpoint | |
7342 | forward, one instruction at a time, overstepping. */ | |
7343 | ||
f2ffa92b | 7344 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
7345 | { |
7346 | ptid_t resume_ptid; | |
7347 | ||
edbcda09 SM |
7348 | infrun_log_debug ("expected thread advanced also (%s -> %s)", |
7349 | paddress (target_gdbarch (), tp->prev_pc), | |
7350 | paddress (target_gdbarch (), tp->suspend.stop_pc)); | |
2ac7589c PA |
7351 | |
7352 | /* Clear the info of the previous step-over, as it's no longer | |
7353 | valid (if the thread was trying to step over a breakpoint, it | |
7354 | has already succeeded). It's what keep_going would do too, | |
7355 | if we called it. Do this before trying to insert the sss | |
7356 | breakpoint, otherwise if we were previously trying to step | |
7357 | over this exact address in another thread, the breakpoint is | |
7358 | skipped. */ | |
7359 | clear_step_over_info (); | |
7360 | tp->control.trap_expected = 0; | |
7361 | ||
7362 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7363 | get_frame_address_space (frame), | |
f2ffa92b | 7364 | tp->suspend.stop_pc); |
2ac7589c | 7365 | |
719546c4 | 7366 | tp->resumed = true; |
fbea99ea | 7367 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7368 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7369 | } | |
7370 | else | |
7371 | { | |
edbcda09 | 7372 | infrun_log_debug ("expected thread still hasn't advanced"); |
2ac7589c PA |
7373 | |
7374 | keep_going_pass_signal (ecs); | |
7375 | } | |
7376 | return 1; | |
c447ac0b PA |
7377 | } |
7378 | ||
8b061563 PA |
7379 | /* Is thread TP in the middle of (software or hardware) |
7380 | single-stepping? (Note the result of this function must never be | |
7381 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7382 | |
a289b8f6 | 7383 | static int |
b3444185 | 7384 | currently_stepping (struct thread_info *tp) |
a7212384 | 7385 | { |
8358c15c JK |
7386 | return ((tp->control.step_range_end |
7387 | && tp->control.step_resume_breakpoint == NULL) | |
7388 | || tp->control.trap_expected | |
af48d08f | 7389 | || tp->stepped_breakpoint |
8358c15c | 7390 | || bpstat_should_step ()); |
a7212384 UW |
7391 | } |
7392 | ||
b2175913 MS |
7393 | /* Inferior has stepped into a subroutine call with source code that |
7394 | we should not step over. Do step to the first line of code in | |
7395 | it. */ | |
c2c6d25f JM |
7396 | |
7397 | static void | |
568d6575 UW |
7398 | handle_step_into_function (struct gdbarch *gdbarch, |
7399 | struct execution_control_state *ecs) | |
c2c6d25f | 7400 | { |
7e324e48 GB |
7401 | fill_in_stop_func (gdbarch, ecs); |
7402 | ||
f2ffa92b PA |
7403 | compunit_symtab *cust |
7404 | = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); | |
43f3e411 | 7405 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7406 | ecs->stop_func_start |
7407 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7408 | |
51abb421 | 7409 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7410 | /* Use the step_resume_break to step until the end of the prologue, |
7411 | even if that involves jumps (as it seems to on the vax under | |
7412 | 4.2). */ | |
7413 | /* If the prologue ends in the middle of a source line, continue to | |
7414 | the end of that source line (if it is still within the function). | |
7415 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7416 | if (stop_func_sal.end |
7417 | && stop_func_sal.pc != ecs->stop_func_start | |
7418 | && stop_func_sal.end < ecs->stop_func_end) | |
7419 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7420 | |
2dbd5e30 KB |
7421 | /* Architectures which require breakpoint adjustment might not be able |
7422 | to place a breakpoint at the computed address. If so, the test | |
7423 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7424 | ecs->stop_func_start to an address at which a breakpoint may be | |
7425 | legitimately placed. | |
8fb3e588 | 7426 | |
2dbd5e30 KB |
7427 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7428 | made, GDB will enter an infinite loop when stepping through | |
7429 | optimized code consisting of VLIW instructions which contain | |
7430 | subinstructions corresponding to different source lines. On | |
7431 | FR-V, it's not permitted to place a breakpoint on any but the | |
7432 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7433 | set, GDB will adjust the breakpoint address to the beginning of | |
7434 | the VLIW instruction. Thus, we need to make the corresponding | |
7435 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7436 | |
568d6575 | 7437 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7438 | { |
7439 | ecs->stop_func_start | |
568d6575 | 7440 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7441 | ecs->stop_func_start); |
2dbd5e30 KB |
7442 | } |
7443 | ||
f2ffa92b | 7444 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7445 | { |
7446 | /* We are already there: stop now. */ | |
bdc36728 | 7447 | end_stepping_range (ecs); |
c2c6d25f JM |
7448 | return; |
7449 | } | |
7450 | else | |
7451 | { | |
7452 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7453 | symtab_and_line sr_sal; |
c2c6d25f JM |
7454 | sr_sal.pc = ecs->stop_func_start; |
7455 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7456 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7457 | |
c2c6d25f | 7458 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7459 | some machines the prologue is where the new fp value is |
7460 | established. */ | |
a6d9a66e | 7461 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7462 | |
7463 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7464 | ecs->event_thread->control.step_range_end |
7465 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7466 | } |
7467 | keep_going (ecs); | |
7468 | } | |
d4f3574e | 7469 | |
b2175913 MS |
7470 | /* Inferior has stepped backward into a subroutine call with source |
7471 | code that we should not step over. Do step to the beginning of the | |
7472 | last line of code in it. */ | |
7473 | ||
7474 | static void | |
568d6575 UW |
7475 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7476 | struct execution_control_state *ecs) | |
b2175913 | 7477 | { |
43f3e411 | 7478 | struct compunit_symtab *cust; |
167e4384 | 7479 | struct symtab_and_line stop_func_sal; |
b2175913 | 7480 | |
7e324e48 GB |
7481 | fill_in_stop_func (gdbarch, ecs); |
7482 | ||
f2ffa92b | 7483 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7484 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7485 | ecs->stop_func_start |
7486 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7487 | |
f2ffa92b | 7488 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7489 | |
7490 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7491 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7492 | { |
7493 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7494 | end_stepping_range (ecs); |
b2175913 MS |
7495 | } |
7496 | else | |
7497 | { | |
7498 | /* Else just reset the step range and keep going. | |
7499 | No step-resume breakpoint, they don't work for | |
7500 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7501 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7502 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7503 | keep_going (ecs); |
7504 | } | |
7505 | return; | |
7506 | } | |
7507 | ||
d3169d93 | 7508 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7509 | This is used to both functions and to skip over code. */ |
7510 | ||
7511 | static void | |
2c03e5be PA |
7512 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7513 | struct symtab_and_line sr_sal, | |
7514 | struct frame_id sr_id, | |
7515 | enum bptype sr_type) | |
44cbf7b5 | 7516 | { |
611c83ae PA |
7517 | /* There should never be more than one step-resume or longjmp-resume |
7518 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7519 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7520 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7521 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 | 7522 | |
edbcda09 SM |
7523 | infrun_log_debug ("inserting step-resume breakpoint at %s", |
7524 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7525 | |
8358c15c | 7526 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7527 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7528 | } |
7529 | ||
9da8c2a0 | 7530 | void |
2c03e5be PA |
7531 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7532 | struct symtab_and_line sr_sal, | |
7533 | struct frame_id sr_id) | |
7534 | { | |
7535 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7536 | sr_sal, sr_id, | |
7537 | bp_step_resume); | |
44cbf7b5 | 7538 | } |
7ce450bd | 7539 | |
2c03e5be PA |
7540 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7541 | This is used to skip a potential signal handler. | |
7ce450bd | 7542 | |
14e60db5 DJ |
7543 | This is called with the interrupted function's frame. The signal |
7544 | handler, when it returns, will resume the interrupted function at | |
7545 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7546 | |
7547 | static void | |
2c03e5be | 7548 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7549 | { |
f4c1edd8 | 7550 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7551 | |
51abb421 PA |
7552 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7553 | ||
7554 | symtab_and_line sr_sal; | |
568d6575 | 7555 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7556 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7557 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7558 | |
2c03e5be PA |
7559 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7560 | get_stack_frame_id (return_frame), | |
7561 | bp_hp_step_resume); | |
d303a6c7 AC |
7562 | } |
7563 | ||
2c03e5be PA |
7564 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7565 | is used to skip a function after stepping into it (for "next" or if | |
7566 | the called function has no debugging information). | |
14e60db5 DJ |
7567 | |
7568 | The current function has almost always been reached by single | |
7569 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7570 | current function, and the breakpoint will be set at the caller's | |
7571 | resume address. | |
7572 | ||
7573 | This is a separate function rather than reusing | |
2c03e5be | 7574 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7575 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7576 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7577 | |
7578 | static void | |
7579 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7580 | { | |
14e60db5 DJ |
7581 | /* We shouldn't have gotten here if we don't know where the call site |
7582 | is. */ | |
c7ce8faa | 7583 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7584 | |
51abb421 | 7585 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7586 | |
51abb421 | 7587 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7588 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7589 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7590 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7591 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7592 | |
a6d9a66e | 7593 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7594 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7595 | } |
7596 | ||
611c83ae PA |
7597 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7598 | new breakpoint at the target of a jmp_buf. The handling of | |
7599 | longjmp-resume uses the same mechanisms used for handling | |
7600 | "step-resume" breakpoints. */ | |
7601 | ||
7602 | static void | |
a6d9a66e | 7603 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7604 | { |
e81a37f7 TT |
7605 | /* There should never be more than one longjmp-resume breakpoint per |
7606 | thread, so we should never be setting a new | |
611c83ae | 7607 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7608 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae | 7609 | |
edbcda09 SM |
7610 | infrun_log_debug ("inserting longjmp-resume breakpoint at %s", |
7611 | paddress (gdbarch, pc)); | |
611c83ae | 7612 | |
e81a37f7 | 7613 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7614 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7615 | } |
7616 | ||
186c406b TT |
7617 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7618 | the exception. The block B is the block of the unwinder debug hook | |
7619 | function. FRAME is the frame corresponding to the call to this | |
7620 | function. SYM is the symbol of the function argument holding the | |
7621 | target PC of the exception. */ | |
7622 | ||
7623 | static void | |
7624 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7625 | const struct block *b, |
186c406b TT |
7626 | struct frame_info *frame, |
7627 | struct symbol *sym) | |
7628 | { | |
a70b8144 | 7629 | try |
186c406b | 7630 | { |
63e43d3a | 7631 | struct block_symbol vsym; |
186c406b TT |
7632 | struct value *value; |
7633 | CORE_ADDR handler; | |
7634 | struct breakpoint *bp; | |
7635 | ||
987012b8 | 7636 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 7637 | b, VAR_DOMAIN); |
63e43d3a | 7638 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7639 | /* If the value was optimized out, revert to the old behavior. */ |
7640 | if (! value_optimized_out (value)) | |
7641 | { | |
7642 | handler = value_as_address (value); | |
7643 | ||
edbcda09 SM |
7644 | infrun_log_debug ("exception resume at %lx", |
7645 | (unsigned long) handler); | |
186c406b TT |
7646 | |
7647 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7648 | handler, |
7649 | bp_exception_resume).release (); | |
c70a6932 JK |
7650 | |
7651 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7652 | frame = NULL; | |
7653 | ||
5d5658a1 | 7654 | bp->thread = tp->global_num; |
186c406b TT |
7655 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7656 | } | |
7657 | } | |
230d2906 | 7658 | catch (const gdb_exception_error &e) |
492d29ea PA |
7659 | { |
7660 | /* We want to ignore errors here. */ | |
7661 | } | |
186c406b TT |
7662 | } |
7663 | ||
28106bc2 SDJ |
7664 | /* A helper for check_exception_resume that sets an |
7665 | exception-breakpoint based on a SystemTap probe. */ | |
7666 | ||
7667 | static void | |
7668 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7669 | const struct bound_probe *probe, |
28106bc2 SDJ |
7670 | struct frame_info *frame) |
7671 | { | |
7672 | struct value *arg_value; | |
7673 | CORE_ADDR handler; | |
7674 | struct breakpoint *bp; | |
7675 | ||
7676 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7677 | if (!arg_value) | |
7678 | return; | |
7679 | ||
7680 | handler = value_as_address (arg_value); | |
7681 | ||
edbcda09 SM |
7682 | infrun_log_debug ("exception resume at %s", |
7683 | paddress (probe->objfile->arch (), handler)); | |
28106bc2 SDJ |
7684 | |
7685 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7686 | handler, bp_exception_resume).release (); |
5d5658a1 | 7687 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7688 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7689 | } | |
7690 | ||
186c406b TT |
7691 | /* This is called when an exception has been intercepted. Check to |
7692 | see whether the exception's destination is of interest, and if so, | |
7693 | set an exception resume breakpoint there. */ | |
7694 | ||
7695 | static void | |
7696 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7697 | struct frame_info *frame) |
186c406b | 7698 | { |
729662a5 | 7699 | struct bound_probe probe; |
28106bc2 SDJ |
7700 | struct symbol *func; |
7701 | ||
7702 | /* First see if this exception unwinding breakpoint was set via a | |
7703 | SystemTap probe point. If so, the probe has two arguments: the | |
7704 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7705 | set a breakpoint there. */ | |
6bac7473 | 7706 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7707 | if (probe.prob) |
28106bc2 | 7708 | { |
729662a5 | 7709 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7710 | return; |
7711 | } | |
7712 | ||
7713 | func = get_frame_function (frame); | |
7714 | if (!func) | |
7715 | return; | |
186c406b | 7716 | |
a70b8144 | 7717 | try |
186c406b | 7718 | { |
3977b71f | 7719 | const struct block *b; |
8157b174 | 7720 | struct block_iterator iter; |
186c406b TT |
7721 | struct symbol *sym; |
7722 | int argno = 0; | |
7723 | ||
7724 | /* The exception breakpoint is a thread-specific breakpoint on | |
7725 | the unwinder's debug hook, declared as: | |
7726 | ||
7727 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7728 | ||
7729 | The CFA argument indicates the frame to which control is | |
7730 | about to be transferred. HANDLER is the destination PC. | |
7731 | ||
7732 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7733 | This is not extremely efficient but it avoids issues in gdb | |
7734 | with computing the DWARF CFA, and it also works even in weird | |
7735 | cases such as throwing an exception from inside a signal | |
7736 | handler. */ | |
7737 | ||
7738 | b = SYMBOL_BLOCK_VALUE (func); | |
7739 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7740 | { | |
7741 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7742 | continue; | |
7743 | ||
7744 | if (argno == 0) | |
7745 | ++argno; | |
7746 | else | |
7747 | { | |
7748 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7749 | b, frame, sym); | |
7750 | break; | |
7751 | } | |
7752 | } | |
7753 | } | |
230d2906 | 7754 | catch (const gdb_exception_error &e) |
492d29ea PA |
7755 | { |
7756 | } | |
186c406b TT |
7757 | } |
7758 | ||
104c1213 | 7759 | static void |
22bcd14b | 7760 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7761 | { |
edbcda09 | 7762 | infrun_log_debug ("stop_waiting"); |
527159b7 | 7763 | |
cd0fc7c3 SS |
7764 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7765 | ecs->wait_some_more = 0; | |
fbea99ea | 7766 | |
53cccef1 | 7767 | /* If all-stop, but there exists a non-stop target, stop all |
fbea99ea | 7768 | threads now that we're presenting the stop to the user. */ |
53cccef1 | 7769 | if (!non_stop && exists_non_stop_target ()) |
fbea99ea | 7770 | stop_all_threads (); |
cd0fc7c3 SS |
7771 | } |
7772 | ||
4d9d9d04 PA |
7773 | /* Like keep_going, but passes the signal to the inferior, even if the |
7774 | signal is set to nopass. */ | |
d4f3574e SS |
7775 | |
7776 | static void | |
4d9d9d04 | 7777 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7778 | { |
d7e15655 | 7779 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 7780 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7781 | |
d4f3574e | 7782 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 7783 | ecs->event_thread->prev_pc |
fc75c28b | 7784 | = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 7785 | |
4d9d9d04 | 7786 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7787 | { |
4d9d9d04 PA |
7788 | struct thread_info *tp = ecs->event_thread; |
7789 | ||
edbcda09 SM |
7790 | infrun_log_debug ("%s has trap_expected set, " |
7791 | "resuming to collect trap", | |
7792 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 | 7793 | |
a9ba6bae PA |
7794 | /* We haven't yet gotten our trap, and either: intercepted a |
7795 | non-signal event (e.g., a fork); or took a signal which we | |
7796 | are supposed to pass through to the inferior. Simply | |
7797 | continue. */ | |
64ce06e4 | 7798 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7799 | } |
372316f1 PA |
7800 | else if (step_over_info_valid_p ()) |
7801 | { | |
7802 | /* Another thread is stepping over a breakpoint in-line. If | |
7803 | this thread needs a step-over too, queue the request. In | |
7804 | either case, this resume must be deferred for later. */ | |
7805 | struct thread_info *tp = ecs->event_thread; | |
7806 | ||
7807 | if (ecs->hit_singlestep_breakpoint | |
7808 | || thread_still_needs_step_over (tp)) | |
7809 | { | |
edbcda09 SM |
7810 | infrun_log_debug ("step-over already in progress: " |
7811 | "step-over for %s deferred", | |
7812 | target_pid_to_str (tp->ptid).c_str ()); | |
7bd43605 | 7813 | global_thread_step_over_chain_enqueue (tp); |
372316f1 PA |
7814 | } |
7815 | else | |
7816 | { | |
edbcda09 SM |
7817 | infrun_log_debug ("step-over in progress: resume of %s deferred", |
7818 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 7819 | } |
372316f1 | 7820 | } |
d4f3574e SS |
7821 | else |
7822 | { | |
31e77af2 | 7823 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7824 | int remove_bp; |
7825 | int remove_wps; | |
8d297bbf | 7826 | step_over_what step_what; |
31e77af2 | 7827 | |
d4f3574e | 7828 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7829 | anyway (if we got a signal, the user asked it be passed to |
7830 | the child) | |
7831 | -- or -- | |
7832 | We got our expected trap, but decided we should resume from | |
7833 | it. | |
d4f3574e | 7834 | |
a9ba6bae | 7835 | We're going to run this baby now! |
d4f3574e | 7836 | |
c36b740a VP |
7837 | Note that insert_breakpoints won't try to re-insert |
7838 | already inserted breakpoints. Therefore, we don't | |
7839 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7840 | |
31e77af2 PA |
7841 | /* If we need to step over a breakpoint, and we're not using |
7842 | displaced stepping to do so, insert all breakpoints | |
7843 | (watchpoints, etc.) but the one we're stepping over, step one | |
7844 | instruction, and then re-insert the breakpoint when that step | |
7845 | is finished. */ | |
963f9c80 | 7846 | |
6c4cfb24 PA |
7847 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7848 | ||
963f9c80 | 7849 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7850 | || (step_what & STEP_OVER_BREAKPOINT)); |
7851 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7852 | |
cb71640d PA |
7853 | /* We can't use displaced stepping if we need to step past a |
7854 | watchpoint. The instruction copied to the scratch pad would | |
7855 | still trigger the watchpoint. */ | |
7856 | if (remove_bp | |
3fc8eb30 | 7857 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7858 | { |
a01bda52 | 7859 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
7860 | regcache_read_pc (regcache), remove_wps, |
7861 | ecs->event_thread->global_num); | |
45e8c884 | 7862 | } |
963f9c80 | 7863 | else if (remove_wps) |
21edc42f | 7864 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
7865 | |
7866 | /* If we now need to do an in-line step-over, we need to stop | |
7867 | all other threads. Note this must be done before | |
7868 | insert_breakpoints below, because that removes the breakpoint | |
7869 | we're about to step over, otherwise other threads could miss | |
7870 | it. */ | |
fbea99ea | 7871 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7872 | stop_all_threads (); |
abbb1732 | 7873 | |
31e77af2 | 7874 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 7875 | try |
31e77af2 PA |
7876 | { |
7877 | insert_breakpoints (); | |
7878 | } | |
230d2906 | 7879 | catch (const gdb_exception_error &e) |
31e77af2 PA |
7880 | { |
7881 | exception_print (gdb_stderr, e); | |
22bcd14b | 7882 | stop_waiting (ecs); |
bdf2a94a | 7883 | clear_step_over_info (); |
31e77af2 | 7884 | return; |
d4f3574e SS |
7885 | } |
7886 | ||
963f9c80 | 7887 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7888 | |
64ce06e4 | 7889 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7890 | } |
7891 | ||
488f131b | 7892 | prepare_to_wait (ecs); |
d4f3574e SS |
7893 | } |
7894 | ||
4d9d9d04 PA |
7895 | /* Called when we should continue running the inferior, because the |
7896 | current event doesn't cause a user visible stop. This does the | |
7897 | resuming part; waiting for the next event is done elsewhere. */ | |
7898 | ||
7899 | static void | |
7900 | keep_going (struct execution_control_state *ecs) | |
7901 | { | |
7902 | if (ecs->event_thread->control.trap_expected | |
7903 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7904 | ecs->event_thread->control.trap_expected = 0; | |
7905 | ||
7906 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7907 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7908 | keep_going_pass_signal (ecs); | |
7909 | } | |
7910 | ||
104c1213 JM |
7911 | /* This function normally comes after a resume, before |
7912 | handle_inferior_event exits. It takes care of any last bits of | |
7913 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7914 | |
104c1213 JM |
7915 | static void |
7916 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7917 | { |
edbcda09 | 7918 | infrun_log_debug ("prepare_to_wait"); |
104c1213 | 7919 | |
104c1213 | 7920 | ecs->wait_some_more = 1; |
0b333c5e | 7921 | |
0e2dba2d PA |
7922 | /* If the target can't async, emulate it by marking the infrun event |
7923 | handler such that as soon as we get back to the event-loop, we | |
7924 | immediately end up in fetch_inferior_event again calling | |
7925 | target_wait. */ | |
7926 | if (!target_can_async_p ()) | |
0b333c5e | 7927 | mark_infrun_async_event_handler (); |
c906108c | 7928 | } |
11cf8741 | 7929 | |
fd664c91 | 7930 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7931 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7932 | |
7933 | static void | |
bdc36728 | 7934 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7935 | { |
bdc36728 | 7936 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7937 | stop_waiting (ecs); |
fd664c91 PA |
7938 | } |
7939 | ||
33d62d64 JK |
7940 | /* Several print_*_reason functions to print why the inferior has stopped. |
7941 | We always print something when the inferior exits, or receives a signal. | |
7942 | The rest of the cases are dealt with later on in normal_stop and | |
7943 | print_it_typical. Ideally there should be a call to one of these | |
7944 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7945 | stop_waiting is called. |
33d62d64 | 7946 | |
fd664c91 PA |
7947 | Note that we don't call these directly, instead we delegate that to |
7948 | the interpreters, through observers. Interpreters then call these | |
7949 | with whatever uiout is right. */ | |
33d62d64 | 7950 | |
fd664c91 PA |
7951 | void |
7952 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7953 | { |
fd664c91 | 7954 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7955 | |
112e8700 | 7956 | if (uiout->is_mi_like_p ()) |
fd664c91 | 7957 | { |
112e8700 | 7958 | uiout->field_string ("reason", |
fd664c91 PA |
7959 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
7960 | } | |
7961 | } | |
33d62d64 | 7962 | |
fd664c91 PA |
7963 | void |
7964 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7965 | { |
33d62d64 | 7966 | annotate_signalled (); |
112e8700 SM |
7967 | if (uiout->is_mi_like_p ()) |
7968 | uiout->field_string | |
7969 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7970 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 7971 | annotate_signal_name (); |
112e8700 | 7972 | uiout->field_string ("signal-name", |
2ea28649 | 7973 | gdb_signal_to_name (siggnal)); |
33d62d64 | 7974 | annotate_signal_name_end (); |
112e8700 | 7975 | uiout->text (", "); |
33d62d64 | 7976 | annotate_signal_string (); |
112e8700 | 7977 | uiout->field_string ("signal-meaning", |
2ea28649 | 7978 | gdb_signal_to_string (siggnal)); |
33d62d64 | 7979 | annotate_signal_string_end (); |
112e8700 SM |
7980 | uiout->text (".\n"); |
7981 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
7982 | } |
7983 | ||
fd664c91 PA |
7984 | void |
7985 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7986 | { |
fda326dd | 7987 | struct inferior *inf = current_inferior (); |
a068643d | 7988 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 7989 | |
33d62d64 JK |
7990 | annotate_exited (exitstatus); |
7991 | if (exitstatus) | |
7992 | { | |
112e8700 SM |
7993 | if (uiout->is_mi_like_p ()) |
7994 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
7995 | std::string exit_code_str |
7996 | = string_printf ("0%o", (unsigned int) exitstatus); | |
7997 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
7998 | plongest (inf->num), pidstr.c_str (), | |
7999 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
8000 | } |
8001 | else | |
11cf8741 | 8002 | { |
112e8700 SM |
8003 | if (uiout->is_mi_like_p ()) |
8004 | uiout->field_string | |
8005 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
8006 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
8007 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 8008 | } |
33d62d64 JK |
8009 | } |
8010 | ||
012b3a21 WT |
8011 | /* Some targets/architectures can do extra processing/display of |
8012 | segmentation faults. E.g., Intel MPX boundary faults. | |
8013 | Call the architecture dependent function to handle the fault. */ | |
8014 | ||
8015 | static void | |
8016 | handle_segmentation_fault (struct ui_out *uiout) | |
8017 | { | |
8018 | struct regcache *regcache = get_current_regcache (); | |
ac7936df | 8019 | struct gdbarch *gdbarch = regcache->arch (); |
012b3a21 WT |
8020 | |
8021 | if (gdbarch_handle_segmentation_fault_p (gdbarch)) | |
8022 | gdbarch_handle_segmentation_fault (gdbarch, uiout); | |
8023 | } | |
8024 | ||
fd664c91 PA |
8025 | void |
8026 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 8027 | { |
f303dbd6 PA |
8028 | struct thread_info *thr = inferior_thread (); |
8029 | ||
33d62d64 JK |
8030 | annotate_signal (); |
8031 | ||
112e8700 | 8032 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
8033 | ; |
8034 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 8035 | { |
f303dbd6 | 8036 | const char *name; |
33d62d64 | 8037 | |
112e8700 | 8038 | uiout->text ("\nThread "); |
33eca680 | 8039 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 PA |
8040 | |
8041 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
8042 | if (name != NULL) | |
8043 | { | |
112e8700 | 8044 | uiout->text (" \""); |
33eca680 | 8045 | uiout->field_string ("name", name); |
112e8700 | 8046 | uiout->text ("\""); |
f303dbd6 | 8047 | } |
33d62d64 | 8048 | } |
f303dbd6 | 8049 | else |
112e8700 | 8050 | uiout->text ("\nProgram"); |
f303dbd6 | 8051 | |
112e8700 SM |
8052 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8053 | uiout->text (" stopped"); | |
33d62d64 JK |
8054 | else |
8055 | { | |
112e8700 | 8056 | uiout->text (" received signal "); |
8b93c638 | 8057 | annotate_signal_name (); |
112e8700 SM |
8058 | if (uiout->is_mi_like_p ()) |
8059 | uiout->field_string | |
8060 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8061 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8062 | annotate_signal_name_end (); |
112e8700 | 8063 | uiout->text (", "); |
8b93c638 | 8064 | annotate_signal_string (); |
112e8700 | 8065 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 WT |
8066 | |
8067 | if (siggnal == GDB_SIGNAL_SEGV) | |
8068 | handle_segmentation_fault (uiout); | |
8069 | ||
8b93c638 | 8070 | annotate_signal_string_end (); |
33d62d64 | 8071 | } |
112e8700 | 8072 | uiout->text (".\n"); |
33d62d64 | 8073 | } |
252fbfc8 | 8074 | |
fd664c91 PA |
8075 | void |
8076 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8077 | { |
112e8700 | 8078 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8079 | } |
43ff13b4 | 8080 | |
0c7e1a46 PA |
8081 | /* Print current location without a level number, if we have changed |
8082 | functions or hit a breakpoint. Print source line if we have one. | |
8083 | bpstat_print contains the logic deciding in detail what to print, | |
8084 | based on the event(s) that just occurred. */ | |
8085 | ||
243a9253 PA |
8086 | static void |
8087 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8088 | { |
8089 | int bpstat_ret; | |
f486487f | 8090 | enum print_what source_flag; |
0c7e1a46 PA |
8091 | int do_frame_printing = 1; |
8092 | struct thread_info *tp = inferior_thread (); | |
8093 | ||
8094 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8095 | switch (bpstat_ret) | |
8096 | { | |
8097 | case PRINT_UNKNOWN: | |
8098 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8099 | should) carry around the function and does (or should) use | |
8100 | that when doing a frame comparison. */ | |
8101 | if (tp->control.stop_step | |
8102 | && frame_id_eq (tp->control.step_frame_id, | |
8103 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
8104 | && (tp->control.step_start_function |
8105 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
8106 | { |
8107 | /* Finished step, just print source line. */ | |
8108 | source_flag = SRC_LINE; | |
8109 | } | |
8110 | else | |
8111 | { | |
8112 | /* Print location and source line. */ | |
8113 | source_flag = SRC_AND_LOC; | |
8114 | } | |
8115 | break; | |
8116 | case PRINT_SRC_AND_LOC: | |
8117 | /* Print location and source line. */ | |
8118 | source_flag = SRC_AND_LOC; | |
8119 | break; | |
8120 | case PRINT_SRC_ONLY: | |
8121 | source_flag = SRC_LINE; | |
8122 | break; | |
8123 | case PRINT_NOTHING: | |
8124 | /* Something bogus. */ | |
8125 | source_flag = SRC_LINE; | |
8126 | do_frame_printing = 0; | |
8127 | break; | |
8128 | default: | |
8129 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8130 | } | |
8131 | ||
8132 | /* The behavior of this routine with respect to the source | |
8133 | flag is: | |
8134 | SRC_LINE: Print only source line | |
8135 | LOCATION: Print only location | |
8136 | SRC_AND_LOC: Print location and source line. */ | |
8137 | if (do_frame_printing) | |
8138 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8139 | } |
8140 | ||
243a9253 PA |
8141 | /* See infrun.h. */ |
8142 | ||
8143 | void | |
4c7d57e7 | 8144 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8145 | { |
243a9253 | 8146 | struct target_waitstatus last; |
243a9253 PA |
8147 | struct thread_info *tp; |
8148 | ||
5b6d1e4f | 8149 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8150 | |
67ad9399 TT |
8151 | { |
8152 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8153 | |
67ad9399 | 8154 | print_stop_location (&last); |
243a9253 | 8155 | |
67ad9399 | 8156 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8157 | if (displays) |
8158 | do_displays (); | |
67ad9399 | 8159 | } |
243a9253 PA |
8160 | |
8161 | tp = inferior_thread (); | |
8162 | if (tp->thread_fsm != NULL | |
46e3ed7f | 8163 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
8164 | { |
8165 | struct return_value_info *rv; | |
8166 | ||
46e3ed7f | 8167 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
8168 | if (rv != NULL) |
8169 | print_return_value (uiout, rv); | |
8170 | } | |
0c7e1a46 PA |
8171 | } |
8172 | ||
388a7084 PA |
8173 | /* See infrun.h. */ |
8174 | ||
8175 | void | |
8176 | maybe_remove_breakpoints (void) | |
8177 | { | |
8178 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
8179 | { | |
8180 | if (remove_breakpoints ()) | |
8181 | { | |
223ffa71 | 8182 | target_terminal::ours_for_output (); |
388a7084 PA |
8183 | printf_filtered (_("Cannot remove breakpoints because " |
8184 | "program is no longer writable.\nFurther " | |
8185 | "execution is probably impossible.\n")); | |
8186 | } | |
8187 | } | |
8188 | } | |
8189 | ||
4c2f2a79 PA |
8190 | /* The execution context that just caused a normal stop. */ |
8191 | ||
8192 | struct stop_context | |
8193 | { | |
2d844eaf TT |
8194 | stop_context (); |
8195 | ~stop_context (); | |
8196 | ||
8197 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8198 | ||
8199 | bool changed () const; | |
8200 | ||
4c2f2a79 PA |
8201 | /* The stop ID. */ |
8202 | ULONGEST stop_id; | |
c906108c | 8203 | |
4c2f2a79 | 8204 | /* The event PTID. */ |
c906108c | 8205 | |
4c2f2a79 PA |
8206 | ptid_t ptid; |
8207 | ||
8208 | /* If stopp for a thread event, this is the thread that caused the | |
8209 | stop. */ | |
8210 | struct thread_info *thread; | |
8211 | ||
8212 | /* The inferior that caused the stop. */ | |
8213 | int inf_num; | |
8214 | }; | |
8215 | ||
2d844eaf | 8216 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8217 | takes a strong reference to the thread. */ |
8218 | ||
2d844eaf | 8219 | stop_context::stop_context () |
4c2f2a79 | 8220 | { |
2d844eaf TT |
8221 | stop_id = get_stop_id (); |
8222 | ptid = inferior_ptid; | |
8223 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8224 | |
d7e15655 | 8225 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8226 | { |
8227 | /* Take a strong reference so that the thread can't be deleted | |
8228 | yet. */ | |
2d844eaf TT |
8229 | thread = inferior_thread (); |
8230 | thread->incref (); | |
4c2f2a79 PA |
8231 | } |
8232 | else | |
2d844eaf | 8233 | thread = NULL; |
4c2f2a79 PA |
8234 | } |
8235 | ||
8236 | /* Release a stop context previously created with save_stop_context. | |
8237 | Releases the strong reference to the thread as well. */ | |
8238 | ||
2d844eaf | 8239 | stop_context::~stop_context () |
4c2f2a79 | 8240 | { |
2d844eaf TT |
8241 | if (thread != NULL) |
8242 | thread->decref (); | |
4c2f2a79 PA |
8243 | } |
8244 | ||
8245 | /* Return true if the current context no longer matches the saved stop | |
8246 | context. */ | |
8247 | ||
2d844eaf TT |
8248 | bool |
8249 | stop_context::changed () const | |
8250 | { | |
8251 | if (ptid != inferior_ptid) | |
8252 | return true; | |
8253 | if (inf_num != current_inferior ()->num) | |
8254 | return true; | |
8255 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8256 | return true; | |
8257 | if (get_stop_id () != stop_id) | |
8258 | return true; | |
8259 | return false; | |
4c2f2a79 PA |
8260 | } |
8261 | ||
8262 | /* See infrun.h. */ | |
8263 | ||
8264 | int | |
96baa820 | 8265 | normal_stop (void) |
c906108c | 8266 | { |
73b65bb0 | 8267 | struct target_waitstatus last; |
73b65bb0 | 8268 | |
5b6d1e4f | 8269 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8270 | |
4c2f2a79 PA |
8271 | new_stop_id (); |
8272 | ||
29f49a6a PA |
8273 | /* If an exception is thrown from this point on, make sure to |
8274 | propagate GDB's knowledge of the executing state to the | |
8275 | frontend/user running state. A QUIT is an easy exception to see | |
8276 | here, so do this before any filtered output. */ | |
731f534f | 8277 | |
5b6d1e4f | 8278 | ptid_t finish_ptid = null_ptid; |
731f534f | 8279 | |
c35b1492 | 8280 | if (!non_stop) |
5b6d1e4f | 8281 | finish_ptid = minus_one_ptid; |
e1316e60 PA |
8282 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8283 | || last.kind == TARGET_WAITKIND_EXITED) | |
8284 | { | |
8285 | /* On some targets, we may still have live threads in the | |
8286 | inferior when we get a process exit event. E.g., for | |
8287 | "checkpoint", when the current checkpoint/fork exits, | |
8288 | linux-fork.c automatically switches to another fork from | |
8289 | within target_mourn_inferior. */ | |
731f534f | 8290 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8291 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 PA |
8292 | } |
8293 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5b6d1e4f PA |
8294 | finish_ptid = inferior_ptid; |
8295 | ||
8296 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8297 | if (finish_ptid != null_ptid) | |
8298 | { | |
8299 | maybe_finish_thread_state.emplace | |
8300 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8301 | } | |
29f49a6a | 8302 | |
b57bacec PA |
8303 | /* As we're presenting a stop, and potentially removing breakpoints, |
8304 | update the thread list so we can tell whether there are threads | |
8305 | running on the target. With target remote, for example, we can | |
8306 | only learn about new threads when we explicitly update the thread | |
8307 | list. Do this before notifying the interpreters about signal | |
8308 | stops, end of stepping ranges, etc., so that the "new thread" | |
8309 | output is emitted before e.g., "Program received signal FOO", | |
8310 | instead of after. */ | |
8311 | update_thread_list (); | |
8312 | ||
8313 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 8314 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 8315 | |
c906108c SS |
8316 | /* As with the notification of thread events, we want to delay |
8317 | notifying the user that we've switched thread context until | |
8318 | the inferior actually stops. | |
8319 | ||
73b65bb0 DJ |
8320 | There's no point in saying anything if the inferior has exited. |
8321 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8322 | "received a signal". |
8323 | ||
8324 | Also skip saying anything in non-stop mode. In that mode, as we | |
8325 | don't want GDB to switch threads behind the user's back, to avoid | |
8326 | races where the user is typing a command to apply to thread x, | |
8327 | but GDB switches to thread y before the user finishes entering | |
8328 | the command, fetch_inferior_event installs a cleanup to restore | |
8329 | the current thread back to the thread the user had selected right | |
8330 | after this event is handled, so we're not really switching, only | |
8331 | informing of a stop. */ | |
4f8d22e3 | 8332 | if (!non_stop |
731f534f | 8333 | && previous_inferior_ptid != inferior_ptid |
73b65bb0 DJ |
8334 | && target_has_execution |
8335 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8336 | && last.kind != TARGET_WAITKIND_EXITED |
8337 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8338 | { |
0e454242 | 8339 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8340 | { |
223ffa71 | 8341 | target_terminal::ours_for_output (); |
3b12939d | 8342 | printf_filtered (_("[Switching to %s]\n"), |
a068643d | 8343 | target_pid_to_str (inferior_ptid).c_str ()); |
3b12939d PA |
8344 | annotate_thread_changed (); |
8345 | } | |
39f77062 | 8346 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8347 | } |
c906108c | 8348 | |
0e5bf2a8 PA |
8349 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8350 | { | |
0e454242 | 8351 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8352 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8353 | { | |
223ffa71 | 8354 | target_terminal::ours_for_output (); |
3b12939d PA |
8355 | printf_filtered (_("No unwaited-for children left.\n")); |
8356 | } | |
0e5bf2a8 PA |
8357 | } |
8358 | ||
b57bacec | 8359 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8360 | maybe_remove_breakpoints (); |
c906108c | 8361 | |
c906108c SS |
8362 | /* If an auto-display called a function and that got a signal, |
8363 | delete that auto-display to avoid an infinite recursion. */ | |
8364 | ||
8365 | if (stopped_by_random_signal) | |
8366 | disable_current_display (); | |
8367 | ||
0e454242 | 8368 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8369 | { |
8370 | async_enable_stdin (); | |
8371 | } | |
c906108c | 8372 | |
388a7084 | 8373 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8374 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8375 | |
8376 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8377 | and current location is based on that. Handle the case where the | |
8378 | dummy call is returning after being stopped. E.g. the dummy call | |
8379 | previously hit a breakpoint. (If the dummy call returns | |
8380 | normally, we won't reach here.) Do this before the stop hook is | |
8381 | run, so that it doesn't get to see the temporary dummy frame, | |
8382 | which is not where we'll present the stop. */ | |
8383 | if (has_stack_frames ()) | |
8384 | { | |
8385 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8386 | { | |
8387 | /* Pop the empty frame that contains the stack dummy. This | |
8388 | also restores inferior state prior to the call (struct | |
8389 | infcall_suspend_state). */ | |
8390 | struct frame_info *frame = get_current_frame (); | |
8391 | ||
8392 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8393 | frame_pop (frame); | |
8394 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8395 | does which means there's now no selected frame. */ | |
8396 | } | |
8397 | ||
8398 | select_frame (get_current_frame ()); | |
8399 | ||
8400 | /* Set the current source location. */ | |
8401 | set_current_sal_from_frame (get_current_frame ()); | |
8402 | } | |
dd7e2d2b PA |
8403 | |
8404 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8405 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8406 | if (stop_command != NULL) |
8407 | { | |
2d844eaf | 8408 | stop_context saved_context; |
4c2f2a79 | 8409 | |
a70b8144 | 8410 | try |
bf469271 PA |
8411 | { |
8412 | execute_cmd_pre_hook (stop_command); | |
8413 | } | |
230d2906 | 8414 | catch (const gdb_exception &ex) |
bf469271 PA |
8415 | { |
8416 | exception_fprintf (gdb_stderr, ex, | |
8417 | "Error while running hook_stop:\n"); | |
8418 | } | |
4c2f2a79 PA |
8419 | |
8420 | /* If the stop hook resumes the target, then there's no point in | |
8421 | trying to notify about the previous stop; its context is | |
8422 | gone. Likewise if the command switches thread or inferior -- | |
8423 | the observers would print a stop for the wrong | |
8424 | thread/inferior. */ | |
2d844eaf TT |
8425 | if (saved_context.changed ()) |
8426 | return 1; | |
4c2f2a79 | 8427 | } |
dd7e2d2b | 8428 | |
388a7084 PA |
8429 | /* Notify observers about the stop. This is where the interpreters |
8430 | print the stop event. */ | |
d7e15655 | 8431 | if (inferior_ptid != null_ptid) |
76727919 | 8432 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
388a7084 PA |
8433 | stop_print_frame); |
8434 | else | |
76727919 | 8435 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8436 | |
243a9253 PA |
8437 | annotate_stopped (); |
8438 | ||
48844aa6 PA |
8439 | if (target_has_execution) |
8440 | { | |
8441 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
fe726667 PA |
8442 | && last.kind != TARGET_WAITKIND_EXITED |
8443 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8444 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8445 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8446 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8447 | } |
6c95b8df PA |
8448 | |
8449 | /* Try to get rid of automatically added inferiors that are no | |
8450 | longer needed. Keeping those around slows down things linearly. | |
8451 | Note that this never removes the current inferior. */ | |
8452 | prune_inferiors (); | |
4c2f2a79 PA |
8453 | |
8454 | return 0; | |
c906108c | 8455 | } |
c906108c | 8456 | \f |
c5aa993b | 8457 | int |
96baa820 | 8458 | signal_stop_state (int signo) |
c906108c | 8459 | { |
d6b48e9c | 8460 | return signal_stop[signo]; |
c906108c SS |
8461 | } |
8462 | ||
c5aa993b | 8463 | int |
96baa820 | 8464 | signal_print_state (int signo) |
c906108c SS |
8465 | { |
8466 | return signal_print[signo]; | |
8467 | } | |
8468 | ||
c5aa993b | 8469 | int |
96baa820 | 8470 | signal_pass_state (int signo) |
c906108c SS |
8471 | { |
8472 | return signal_program[signo]; | |
8473 | } | |
8474 | ||
2455069d UW |
8475 | static void |
8476 | signal_cache_update (int signo) | |
8477 | { | |
8478 | if (signo == -1) | |
8479 | { | |
a493e3e2 | 8480 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8481 | signal_cache_update (signo); |
8482 | ||
8483 | return; | |
8484 | } | |
8485 | ||
8486 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8487 | && signal_print[signo] == 0 | |
ab04a2af TT |
8488 | && signal_program[signo] == 1 |
8489 | && signal_catch[signo] == 0); | |
2455069d UW |
8490 | } |
8491 | ||
488f131b | 8492 | int |
7bda5e4a | 8493 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8494 | { |
8495 | int ret = signal_stop[signo]; | |
abbb1732 | 8496 | |
d4f3574e | 8497 | signal_stop[signo] = state; |
2455069d | 8498 | signal_cache_update (signo); |
d4f3574e SS |
8499 | return ret; |
8500 | } | |
8501 | ||
488f131b | 8502 | int |
7bda5e4a | 8503 | signal_print_update (int signo, int state) |
d4f3574e SS |
8504 | { |
8505 | int ret = signal_print[signo]; | |
abbb1732 | 8506 | |
d4f3574e | 8507 | signal_print[signo] = state; |
2455069d | 8508 | signal_cache_update (signo); |
d4f3574e SS |
8509 | return ret; |
8510 | } | |
8511 | ||
488f131b | 8512 | int |
7bda5e4a | 8513 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8514 | { |
8515 | int ret = signal_program[signo]; | |
abbb1732 | 8516 | |
d4f3574e | 8517 | signal_program[signo] = state; |
2455069d | 8518 | signal_cache_update (signo); |
d4f3574e SS |
8519 | return ret; |
8520 | } | |
8521 | ||
ab04a2af TT |
8522 | /* Update the global 'signal_catch' from INFO and notify the |
8523 | target. */ | |
8524 | ||
8525 | void | |
8526 | signal_catch_update (const unsigned int *info) | |
8527 | { | |
8528 | int i; | |
8529 | ||
8530 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8531 | signal_catch[i] = info[i] > 0; | |
8532 | signal_cache_update (-1); | |
adc6a863 | 8533 | target_pass_signals (signal_pass); |
ab04a2af TT |
8534 | } |
8535 | ||
c906108c | 8536 | static void |
96baa820 | 8537 | sig_print_header (void) |
c906108c | 8538 | { |
3e43a32a MS |
8539 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8540 | "to program\tDescription\n")); | |
c906108c SS |
8541 | } |
8542 | ||
8543 | static void | |
2ea28649 | 8544 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8545 | { |
2ea28649 | 8546 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8547 | int name_padding = 13 - strlen (name); |
96baa820 | 8548 | |
c906108c SS |
8549 | if (name_padding <= 0) |
8550 | name_padding = 0; | |
8551 | ||
8552 | printf_filtered ("%s", name); | |
488f131b | 8553 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8554 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8555 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8556 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8557 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8558 | } |
8559 | ||
8560 | /* Specify how various signals in the inferior should be handled. */ | |
8561 | ||
8562 | static void | |
0b39b52e | 8563 | handle_command (const char *args, int from_tty) |
c906108c | 8564 | { |
c906108c | 8565 | int digits, wordlen; |
b926417a | 8566 | int sigfirst, siglast; |
2ea28649 | 8567 | enum gdb_signal oursig; |
c906108c | 8568 | int allsigs; |
c906108c SS |
8569 | |
8570 | if (args == NULL) | |
8571 | { | |
e2e0b3e5 | 8572 | error_no_arg (_("signal to handle")); |
c906108c SS |
8573 | } |
8574 | ||
1777feb0 | 8575 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8576 | |
adc6a863 PA |
8577 | const size_t nsigs = GDB_SIGNAL_LAST; |
8578 | unsigned char sigs[nsigs] {}; | |
c906108c | 8579 | |
1777feb0 | 8580 | /* Break the command line up into args. */ |
c906108c | 8581 | |
773a1edc | 8582 | gdb_argv built_argv (args); |
c906108c SS |
8583 | |
8584 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8585 | actions. Signal numbers and signal names may be interspersed with | |
8586 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8587 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8588 | |
773a1edc | 8589 | for (char *arg : built_argv) |
c906108c | 8590 | { |
773a1edc TT |
8591 | wordlen = strlen (arg); |
8592 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8593 | {; |
8594 | } | |
8595 | allsigs = 0; | |
8596 | sigfirst = siglast = -1; | |
8597 | ||
773a1edc | 8598 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8599 | { |
8600 | /* Apply action to all signals except those used by the | |
1777feb0 | 8601 | debugger. Silently skip those. */ |
c906108c SS |
8602 | allsigs = 1; |
8603 | sigfirst = 0; | |
8604 | siglast = nsigs - 1; | |
8605 | } | |
773a1edc | 8606 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8607 | { |
8608 | SET_SIGS (nsigs, sigs, signal_stop); | |
8609 | SET_SIGS (nsigs, sigs, signal_print); | |
8610 | } | |
773a1edc | 8611 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8612 | { |
8613 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8614 | } | |
773a1edc | 8615 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8616 | { |
8617 | SET_SIGS (nsigs, sigs, signal_print); | |
8618 | } | |
773a1edc | 8619 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8620 | { |
8621 | SET_SIGS (nsigs, sigs, signal_program); | |
8622 | } | |
773a1edc | 8623 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8624 | { |
8625 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8626 | } | |
773a1edc | 8627 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8628 | { |
8629 | SET_SIGS (nsigs, sigs, signal_program); | |
8630 | } | |
773a1edc | 8631 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8632 | { |
8633 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8634 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8635 | } | |
773a1edc | 8636 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8637 | { |
8638 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8639 | } | |
8640 | else if (digits > 0) | |
8641 | { | |
8642 | /* It is numeric. The numeric signal refers to our own | |
8643 | internal signal numbering from target.h, not to host/target | |
8644 | signal number. This is a feature; users really should be | |
8645 | using symbolic names anyway, and the common ones like | |
8646 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8647 | ||
8648 | sigfirst = siglast = (int) | |
773a1edc TT |
8649 | gdb_signal_from_command (atoi (arg)); |
8650 | if (arg[digits] == '-') | |
c906108c SS |
8651 | { |
8652 | siglast = (int) | |
773a1edc | 8653 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8654 | } |
8655 | if (sigfirst > siglast) | |
8656 | { | |
1777feb0 | 8657 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8658 | std::swap (sigfirst, siglast); |
c906108c SS |
8659 | } |
8660 | } | |
8661 | else | |
8662 | { | |
773a1edc | 8663 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8664 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8665 | { |
8666 | sigfirst = siglast = (int) oursig; | |
8667 | } | |
8668 | else | |
8669 | { | |
8670 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8671 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8672 | } |
8673 | } | |
8674 | ||
8675 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8676 | which signals to apply actions to. */ |
c906108c | 8677 | |
b926417a | 8678 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8679 | { |
2ea28649 | 8680 | switch ((enum gdb_signal) signum) |
c906108c | 8681 | { |
a493e3e2 PA |
8682 | case GDB_SIGNAL_TRAP: |
8683 | case GDB_SIGNAL_INT: | |
c906108c SS |
8684 | if (!allsigs && !sigs[signum]) |
8685 | { | |
9e2f0ad4 | 8686 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8687 | Are you sure you want to change it? "), |
2ea28649 | 8688 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8689 | { |
8690 | sigs[signum] = 1; | |
8691 | } | |
8692 | else | |
c119e040 | 8693 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8694 | } |
8695 | break; | |
a493e3e2 PA |
8696 | case GDB_SIGNAL_0: |
8697 | case GDB_SIGNAL_DEFAULT: | |
8698 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8699 | /* Make sure that "all" doesn't print these. */ |
8700 | break; | |
8701 | default: | |
8702 | sigs[signum] = 1; | |
8703 | break; | |
8704 | } | |
8705 | } | |
c906108c SS |
8706 | } |
8707 | ||
b926417a | 8708 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8709 | if (sigs[signum]) |
8710 | { | |
2455069d | 8711 | signal_cache_update (-1); |
adc6a863 PA |
8712 | target_pass_signals (signal_pass); |
8713 | target_program_signals (signal_program); | |
c906108c | 8714 | |
3a031f65 PA |
8715 | if (from_tty) |
8716 | { | |
8717 | /* Show the results. */ | |
8718 | sig_print_header (); | |
8719 | for (; signum < nsigs; signum++) | |
8720 | if (sigs[signum]) | |
aead7601 | 8721 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8722 | } |
8723 | ||
8724 | break; | |
8725 | } | |
c906108c SS |
8726 | } |
8727 | ||
de0bea00 MF |
8728 | /* Complete the "handle" command. */ |
8729 | ||
eb3ff9a5 | 8730 | static void |
de0bea00 | 8731 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8732 | completion_tracker &tracker, |
6f937416 | 8733 | const char *text, const char *word) |
de0bea00 | 8734 | { |
de0bea00 MF |
8735 | static const char * const keywords[] = |
8736 | { | |
8737 | "all", | |
8738 | "stop", | |
8739 | "ignore", | |
8740 | "print", | |
8741 | "pass", | |
8742 | "nostop", | |
8743 | "noignore", | |
8744 | "noprint", | |
8745 | "nopass", | |
8746 | NULL, | |
8747 | }; | |
8748 | ||
eb3ff9a5 PA |
8749 | signal_completer (ignore, tracker, text, word); |
8750 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8751 | } |
8752 | ||
2ea28649 PA |
8753 | enum gdb_signal |
8754 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8755 | { |
8756 | if (num >= 1 && num <= 15) | |
2ea28649 | 8757 | return (enum gdb_signal) num; |
ed01b82c PA |
8758 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8759 | Use \"info signals\" for a list of symbolic signals.")); | |
8760 | } | |
8761 | ||
c906108c SS |
8762 | /* Print current contents of the tables set by the handle command. |
8763 | It is possible we should just be printing signals actually used | |
8764 | by the current target (but for things to work right when switching | |
8765 | targets, all signals should be in the signal tables). */ | |
8766 | ||
8767 | static void | |
1d12d88f | 8768 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8769 | { |
2ea28649 | 8770 | enum gdb_signal oursig; |
abbb1732 | 8771 | |
c906108c SS |
8772 | sig_print_header (); |
8773 | ||
8774 | if (signum_exp) | |
8775 | { | |
8776 | /* First see if this is a symbol name. */ | |
2ea28649 | 8777 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8778 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8779 | { |
8780 | /* No, try numeric. */ | |
8781 | oursig = | |
2ea28649 | 8782 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8783 | } |
8784 | sig_print_info (oursig); | |
8785 | return; | |
8786 | } | |
8787 | ||
8788 | printf_filtered ("\n"); | |
8789 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8790 | for (oursig = GDB_SIGNAL_FIRST; |
8791 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8792 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8793 | { |
8794 | QUIT; | |
8795 | ||
a493e3e2 PA |
8796 | if (oursig != GDB_SIGNAL_UNKNOWN |
8797 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8798 | sig_print_info (oursig); |
8799 | } | |
8800 | ||
3e43a32a MS |
8801 | printf_filtered (_("\nUse the \"handle\" command " |
8802 | "to change these tables.\n")); | |
c906108c | 8803 | } |
4aa995e1 PA |
8804 | |
8805 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8806 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8807 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8808 | also dependent on which thread you have selected. |
8809 | ||
8810 | 1. making $_siginfo be an internalvar that creates a new value on | |
8811 | access. | |
8812 | ||
8813 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8814 | ||
8815 | /* This function implements the lval_computed support for reading a | |
8816 | $_siginfo value. */ | |
8817 | ||
8818 | static void | |
8819 | siginfo_value_read (struct value *v) | |
8820 | { | |
8821 | LONGEST transferred; | |
8822 | ||
a911d87a PA |
8823 | /* If we can access registers, so can we access $_siginfo. Likewise |
8824 | vice versa. */ | |
8825 | validate_registers_access (); | |
c709acd1 | 8826 | |
4aa995e1 | 8827 | transferred = |
8b88a78e | 8828 | target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, |
4aa995e1 PA |
8829 | NULL, |
8830 | value_contents_all_raw (v), | |
8831 | value_offset (v), | |
8832 | TYPE_LENGTH (value_type (v))); | |
8833 | ||
8834 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8835 | error (_("Unable to read siginfo")); | |
8836 | } | |
8837 | ||
8838 | /* This function implements the lval_computed support for writing a | |
8839 | $_siginfo value. */ | |
8840 | ||
8841 | static void | |
8842 | siginfo_value_write (struct value *v, struct value *fromval) | |
8843 | { | |
8844 | LONGEST transferred; | |
8845 | ||
a911d87a PA |
8846 | /* If we can access registers, so can we access $_siginfo. Likewise |
8847 | vice versa. */ | |
8848 | validate_registers_access (); | |
c709acd1 | 8849 | |
8b88a78e | 8850 | transferred = target_write (current_top_target (), |
4aa995e1 PA |
8851 | TARGET_OBJECT_SIGNAL_INFO, |
8852 | NULL, | |
8853 | value_contents_all_raw (fromval), | |
8854 | value_offset (v), | |
8855 | TYPE_LENGTH (value_type (fromval))); | |
8856 | ||
8857 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8858 | error (_("Unable to write siginfo")); | |
8859 | } | |
8860 | ||
c8f2448a | 8861 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8862 | { |
8863 | siginfo_value_read, | |
8864 | siginfo_value_write | |
8865 | }; | |
8866 | ||
8867 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8868 | the current thread using architecture GDBARCH. Return a void value |
8869 | if there's no object available. */ | |
4aa995e1 | 8870 | |
2c0b251b | 8871 | static struct value * |
22d2b532 SDJ |
8872 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8873 | void *ignore) | |
4aa995e1 | 8874 | { |
4aa995e1 | 8875 | if (target_has_stack |
d7e15655 | 8876 | && inferior_ptid != null_ptid |
78267919 | 8877 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 8878 | { |
78267919 | 8879 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8880 | |
78267919 | 8881 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8882 | } |
8883 | ||
78267919 | 8884 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8885 | } |
8886 | ||
c906108c | 8887 | \f |
16c381f0 JK |
8888 | /* infcall_suspend_state contains state about the program itself like its |
8889 | registers and any signal it received when it last stopped. | |
8890 | This state must be restored regardless of how the inferior function call | |
8891 | ends (either successfully, or after it hits a breakpoint or signal) | |
8892 | if the program is to properly continue where it left off. */ | |
8893 | ||
6bf78e29 | 8894 | class infcall_suspend_state |
7a292a7a | 8895 | { |
6bf78e29 AB |
8896 | public: |
8897 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
8898 | once the inferior function call has finished. */ | |
8899 | infcall_suspend_state (struct gdbarch *gdbarch, | |
8900 | const struct thread_info *tp, | |
8901 | struct regcache *regcache) | |
8902 | : m_thread_suspend (tp->suspend), | |
8903 | m_registers (new readonly_detached_regcache (*regcache)) | |
8904 | { | |
8905 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
8906 | ||
8907 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8908 | { | |
8909 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8910 | size_t len = TYPE_LENGTH (type); | |
8911 | ||
8912 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); | |
8913 | ||
8914 | if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8915 | siginfo_data.get (), 0, len) != len) | |
8916 | { | |
8917 | /* Errors ignored. */ | |
8918 | siginfo_data.reset (nullptr); | |
8919 | } | |
8920 | } | |
8921 | ||
8922 | if (siginfo_data) | |
8923 | { | |
8924 | m_siginfo_gdbarch = gdbarch; | |
8925 | m_siginfo_data = std::move (siginfo_data); | |
8926 | } | |
8927 | } | |
8928 | ||
8929 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 8930 | |
6bf78e29 AB |
8931 | readonly_detached_regcache *registers () const |
8932 | { | |
8933 | return m_registers.get (); | |
8934 | } | |
8935 | ||
8936 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
8937 | ||
8938 | void restore (struct gdbarch *gdbarch, | |
8939 | struct thread_info *tp, | |
8940 | struct regcache *regcache) const | |
8941 | { | |
8942 | tp->suspend = m_thread_suspend; | |
8943 | ||
8944 | if (m_siginfo_gdbarch == gdbarch) | |
8945 | { | |
8946 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8947 | ||
8948 | /* Errors ignored. */ | |
8949 | target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8950 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); | |
8951 | } | |
8952 | ||
8953 | /* The inferior can be gone if the user types "print exit(0)" | |
8954 | (and perhaps other times). */ | |
8955 | if (target_has_execution) | |
8956 | /* NB: The register write goes through to the target. */ | |
8957 | regcache->restore (registers ()); | |
8958 | } | |
8959 | ||
8960 | private: | |
8961 | /* How the current thread stopped before the inferior function call was | |
8962 | executed. */ | |
8963 | struct thread_suspend_state m_thread_suspend; | |
8964 | ||
8965 | /* The registers before the inferior function call was executed. */ | |
8966 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 8967 | |
35515841 | 8968 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 8969 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
8970 | |
8971 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8972 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8973 | content would be invalid. */ | |
6bf78e29 | 8974 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
8975 | }; |
8976 | ||
cb524840 TT |
8977 | infcall_suspend_state_up |
8978 | save_infcall_suspend_state () | |
b89667eb | 8979 | { |
b89667eb | 8980 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 8981 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8982 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 8983 | |
6bf78e29 AB |
8984 | infcall_suspend_state_up inf_state |
8985 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 8986 | |
6bf78e29 AB |
8987 | /* Having saved the current state, adjust the thread state, discarding |
8988 | any stop signal information. The stop signal is not useful when | |
8989 | starting an inferior function call, and run_inferior_call will not use | |
8990 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 8991 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 8992 | |
b89667eb DE |
8993 | return inf_state; |
8994 | } | |
8995 | ||
8996 | /* Restore inferior session state to INF_STATE. */ | |
8997 | ||
8998 | void | |
16c381f0 | 8999 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
9000 | { |
9001 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 9002 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9003 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 9004 | |
6bf78e29 | 9005 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 9006 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
9007 | } |
9008 | ||
b89667eb | 9009 | void |
16c381f0 | 9010 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 9011 | { |
dd848631 | 9012 | delete inf_state; |
b89667eb DE |
9013 | } |
9014 | ||
daf6667d | 9015 | readonly_detached_regcache * |
16c381f0 | 9016 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 9017 | { |
6bf78e29 | 9018 | return inf_state->registers (); |
b89667eb DE |
9019 | } |
9020 | ||
16c381f0 JK |
9021 | /* infcall_control_state contains state regarding gdb's control of the |
9022 | inferior itself like stepping control. It also contains session state like | |
9023 | the user's currently selected frame. */ | |
b89667eb | 9024 | |
16c381f0 | 9025 | struct infcall_control_state |
b89667eb | 9026 | { |
16c381f0 JK |
9027 | struct thread_control_state thread_control; |
9028 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
9029 | |
9030 | /* Other fields: */ | |
ee841dd8 TT |
9031 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
9032 | int stopped_by_random_signal = 0; | |
7a292a7a | 9033 | |
b89667eb | 9034 | /* ID if the selected frame when the inferior function call was made. */ |
ee841dd8 | 9035 | struct frame_id selected_frame_id {}; |
7a292a7a SS |
9036 | }; |
9037 | ||
c906108c | 9038 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9039 | connection. */ |
c906108c | 9040 | |
cb524840 TT |
9041 | infcall_control_state_up |
9042 | save_infcall_control_state () | |
c906108c | 9043 | { |
cb524840 | 9044 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9045 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9046 | struct inferior *inf = current_inferior (); |
7a292a7a | 9047 | |
16c381f0 JK |
9048 | inf_status->thread_control = tp->control; |
9049 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9050 | |
8358c15c | 9051 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9052 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9053 | |
16c381f0 JK |
9054 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9055 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9056 | hand them back the original chain when restore_infcall_control_state is | |
9057 | called. */ | |
9058 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9059 | |
9060 | /* Other fields: */ | |
9061 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9062 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9063 | |
206415a3 | 9064 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 9065 | |
7a292a7a | 9066 | return inf_status; |
c906108c SS |
9067 | } |
9068 | ||
bf469271 PA |
9069 | static void |
9070 | restore_selected_frame (const frame_id &fid) | |
c906108c | 9071 | { |
bf469271 | 9072 | frame_info *frame = frame_find_by_id (fid); |
c906108c | 9073 | |
aa0cd9c1 AC |
9074 | /* If inf_status->selected_frame_id is NULL, there was no previously |
9075 | selected frame. */ | |
101dcfbe | 9076 | if (frame == NULL) |
c906108c | 9077 | { |
8a3fe4f8 | 9078 | warning (_("Unable to restore previously selected frame.")); |
bf469271 | 9079 | return; |
c906108c SS |
9080 | } |
9081 | ||
0f7d239c | 9082 | select_frame (frame); |
c906108c SS |
9083 | } |
9084 | ||
b89667eb DE |
9085 | /* Restore inferior session state to INF_STATUS. */ |
9086 | ||
c906108c | 9087 | void |
16c381f0 | 9088 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9089 | { |
4e1c45ea | 9090 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9091 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9092 | |
8358c15c JK |
9093 | if (tp->control.step_resume_breakpoint) |
9094 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9095 | ||
5b79abe7 TT |
9096 | if (tp->control.exception_resume_breakpoint) |
9097 | tp->control.exception_resume_breakpoint->disposition | |
9098 | = disp_del_at_next_stop; | |
9099 | ||
d82142e2 | 9100 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9101 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9102 | |
16c381f0 JK |
9103 | tp->control = inf_status->thread_control; |
9104 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9105 | |
9106 | /* Other fields: */ | |
9107 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9108 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9109 | |
b89667eb | 9110 | if (target_has_stack) |
c906108c | 9111 | { |
bf469271 | 9112 | /* The point of the try/catch is that if the stack is clobbered, |
101dcfbe AC |
9113 | walking the stack might encounter a garbage pointer and |
9114 | error() trying to dereference it. */ | |
a70b8144 | 9115 | try |
bf469271 PA |
9116 | { |
9117 | restore_selected_frame (inf_status->selected_frame_id); | |
9118 | } | |
230d2906 | 9119 | catch (const gdb_exception_error &ex) |
bf469271 PA |
9120 | { |
9121 | exception_fprintf (gdb_stderr, ex, | |
9122 | "Unable to restore previously selected frame:\n"); | |
9123 | /* Error in restoring the selected frame. Select the | |
9124 | innermost frame. */ | |
9125 | select_frame (get_current_frame ()); | |
9126 | } | |
c906108c | 9127 | } |
c906108c | 9128 | |
ee841dd8 | 9129 | delete inf_status; |
7a292a7a | 9130 | } |
c906108c SS |
9131 | |
9132 | void | |
16c381f0 | 9133 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9134 | { |
8358c15c JK |
9135 | if (inf_status->thread_control.step_resume_breakpoint) |
9136 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9137 | = disp_del_at_next_stop; | |
9138 | ||
5b79abe7 TT |
9139 | if (inf_status->thread_control.exception_resume_breakpoint) |
9140 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9141 | = disp_del_at_next_stop; | |
9142 | ||
1777feb0 | 9143 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9144 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9145 | |
ee841dd8 | 9146 | delete inf_status; |
7a292a7a | 9147 | } |
b89667eb | 9148 | \f |
7f89fd65 | 9149 | /* See infrun.h. */ |
0c557179 SDJ |
9150 | |
9151 | void | |
9152 | clear_exit_convenience_vars (void) | |
9153 | { | |
9154 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9155 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9156 | } | |
c5aa993b | 9157 | \f |
488f131b | 9158 | |
b2175913 MS |
9159 | /* User interface for reverse debugging: |
9160 | Set exec-direction / show exec-direction commands | |
9161 | (returns error unless target implements to_set_exec_direction method). */ | |
9162 | ||
170742de | 9163 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9164 | static const char exec_forward[] = "forward"; |
9165 | static const char exec_reverse[] = "reverse"; | |
9166 | static const char *exec_direction = exec_forward; | |
40478521 | 9167 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9168 | exec_forward, |
9169 | exec_reverse, | |
9170 | NULL | |
9171 | }; | |
9172 | ||
9173 | static void | |
eb4c3f4a | 9174 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9175 | struct cmd_list_element *cmd) |
9176 | { | |
9177 | if (target_can_execute_reverse) | |
9178 | { | |
9179 | if (!strcmp (exec_direction, exec_forward)) | |
9180 | execution_direction = EXEC_FORWARD; | |
9181 | else if (!strcmp (exec_direction, exec_reverse)) | |
9182 | execution_direction = EXEC_REVERSE; | |
9183 | } | |
8bbed405 MS |
9184 | else |
9185 | { | |
9186 | exec_direction = exec_forward; | |
9187 | error (_("Target does not support this operation.")); | |
9188 | } | |
b2175913 MS |
9189 | } |
9190 | ||
9191 | static void | |
9192 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9193 | struct cmd_list_element *cmd, const char *value) | |
9194 | { | |
9195 | switch (execution_direction) { | |
9196 | case EXEC_FORWARD: | |
9197 | fprintf_filtered (out, _("Forward.\n")); | |
9198 | break; | |
9199 | case EXEC_REVERSE: | |
9200 | fprintf_filtered (out, _("Reverse.\n")); | |
9201 | break; | |
b2175913 | 9202 | default: |
d8b34453 PA |
9203 | internal_error (__FILE__, __LINE__, |
9204 | _("bogus execution_direction value: %d"), | |
9205 | (int) execution_direction); | |
b2175913 MS |
9206 | } |
9207 | } | |
9208 | ||
d4db2f36 PA |
9209 | static void |
9210 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9211 | struct cmd_list_element *c, const char *value) | |
9212 | { | |
3e43a32a MS |
9213 | fprintf_filtered (file, _("Resuming the execution of threads " |
9214 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9215 | } |
ad52ddc6 | 9216 | |
22d2b532 SDJ |
9217 | /* Implementation of `siginfo' variable. */ |
9218 | ||
9219 | static const struct internalvar_funcs siginfo_funcs = | |
9220 | { | |
9221 | siginfo_make_value, | |
9222 | NULL, | |
9223 | NULL | |
9224 | }; | |
9225 | ||
372316f1 PA |
9226 | /* Callback for infrun's target events source. This is marked when a |
9227 | thread has a pending status to process. */ | |
9228 | ||
9229 | static void | |
9230 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9231 | { | |
b1a35af2 | 9232 | inferior_event_handler (INF_REG_EVENT); |
372316f1 PA |
9233 | } |
9234 | ||
6c265988 | 9235 | void _initialize_infrun (); |
c906108c | 9236 | void |
6c265988 | 9237 | _initialize_infrun () |
c906108c | 9238 | { |
de0bea00 | 9239 | struct cmd_list_element *c; |
c906108c | 9240 | |
372316f1 PA |
9241 | /* Register extra event sources in the event loop. */ |
9242 | infrun_async_inferior_event_token | |
9243 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
9244 | ||
11db9430 | 9245 | add_info ("signals", info_signals_command, _("\ |
1bedd215 AC |
9246 | What debugger does when program gets various signals.\n\ |
9247 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9248 | add_info_alias ("handle", "signals", 0); |
9249 | ||
de0bea00 | 9250 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9251 | Specify how to handle signals.\n\ |
486c7739 | 9252 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9253 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9254 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9255 | will be displayed instead.\n\ |
9256 | \n\ | |
c906108c SS |
9257 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9258 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9259 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9260 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9261 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9262 | \n\ |
1bedd215 | 9263 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9264 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9265 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9266 | Print means print a message if this signal happens.\n\ | |
9267 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9268 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9269 | Pass and Stop may be combined.\n\ |
9270 | \n\ | |
9271 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9272 | may be interspersed with actions, with the actions being performed for\n\ | |
9273 | all signals cumulatively specified.")); | |
de0bea00 | 9274 | set_cmd_completer (c, handle_completer); |
486c7739 | 9275 | |
c906108c | 9276 | if (!dbx_commands) |
1a966eab AC |
9277 | stop_command = add_cmd ("stop", class_obscure, |
9278 | not_just_help_class_command, _("\ | |
9279 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9280 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9281 | of the program stops."), &cmdlist); |
c906108c | 9282 | |
ccce17b0 | 9283 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9284 | Set inferior debugging."), _("\ |
9285 | Show inferior debugging."), _("\ | |
9286 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9287 | NULL, |
9288 | show_debug_infrun, | |
9289 | &setdebuglist, &showdebuglist); | |
527159b7 | 9290 | |
3e43a32a MS |
9291 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9292 | &debug_displaced, _("\ | |
237fc4c9 PA |
9293 | Set displaced stepping debugging."), _("\ |
9294 | Show displaced stepping debugging."), _("\ | |
9295 | When non-zero, displaced stepping specific debugging is enabled."), | |
9296 | NULL, | |
9297 | show_debug_displaced, | |
9298 | &setdebuglist, &showdebuglist); | |
9299 | ||
ad52ddc6 PA |
9300 | add_setshow_boolean_cmd ("non-stop", no_class, |
9301 | &non_stop_1, _("\ | |
9302 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9303 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9304 | When debugging a multi-threaded program and this setting is\n\ | |
9305 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9306 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9307 | all other threads in the program while you interact with the thread of\n\ | |
9308 | interest. When you continue or step a thread, you can allow the other\n\ | |
9309 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9310 | thread's state, all threads stop.\n\ | |
9311 | \n\ | |
9312 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9313 | to run freely. You'll be able to step each thread independently,\n\ | |
9314 | leave it stopped or free to run as needed."), | |
9315 | set_non_stop, | |
9316 | show_non_stop, | |
9317 | &setlist, | |
9318 | &showlist); | |
9319 | ||
adc6a863 | 9320 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9321 | { |
9322 | signal_stop[i] = 1; | |
9323 | signal_print[i] = 1; | |
9324 | signal_program[i] = 1; | |
ab04a2af | 9325 | signal_catch[i] = 0; |
c906108c SS |
9326 | } |
9327 | ||
4d9d9d04 PA |
9328 | /* Signals caused by debugger's own actions should not be given to |
9329 | the program afterwards. | |
9330 | ||
9331 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9332 | explicitly specifies that it should be delivered to the target | |
9333 | program. Typically, that would occur when a user is debugging a | |
9334 | target monitor on a simulator: the target monitor sets a | |
9335 | breakpoint; the simulator encounters this breakpoint and halts | |
9336 | the simulation handing control to GDB; GDB, noting that the stop | |
9337 | address doesn't map to any known breakpoint, returns control back | |
9338 | to the simulator; the simulator then delivers the hardware | |
9339 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9340 | debugged. */ | |
a493e3e2 PA |
9341 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9342 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9343 | |
9344 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9345 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9346 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9347 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9348 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9349 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9350 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9351 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9352 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9353 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9354 | signal_print[GDB_SIGNAL_IO] = 0; | |
9355 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9356 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9357 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9358 | signal_print[GDB_SIGNAL_URG] = 0; | |
9359 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9360 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9361 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9362 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9363 | |
cd0fc7c3 SS |
9364 | /* These signals are used internally by user-level thread |
9365 | implementations. (See signal(5) on Solaris.) Like the above | |
9366 | signals, a healthy program receives and handles them as part of | |
9367 | its normal operation. */ | |
a493e3e2 PA |
9368 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9369 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9370 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9371 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9372 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9373 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9374 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9375 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9376 | |
2455069d UW |
9377 | /* Update cached state. */ |
9378 | signal_cache_update (-1); | |
9379 | ||
85c07804 AC |
9380 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9381 | &stop_on_solib_events, _("\ | |
9382 | Set stopping for shared library events."), _("\ | |
9383 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9384 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9385 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9386 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9387 | set_stop_on_solib_events, |
920d2a44 | 9388 | show_stop_on_solib_events, |
85c07804 | 9389 | &setlist, &showlist); |
c906108c | 9390 | |
7ab04401 AC |
9391 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9392 | follow_fork_mode_kind_names, | |
9393 | &follow_fork_mode_string, _("\ | |
9394 | Set debugger response to a program call of fork or vfork."), _("\ | |
9395 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9396 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9397 | parent - the original process is debugged after a fork\n\ | |
9398 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9399 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9400 | By default, the debugger will follow the parent process."), |
9401 | NULL, | |
920d2a44 | 9402 | show_follow_fork_mode_string, |
7ab04401 AC |
9403 | &setlist, &showlist); |
9404 | ||
6c95b8df PA |
9405 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9406 | follow_exec_mode_names, | |
9407 | &follow_exec_mode_string, _("\ | |
9408 | Set debugger response to a program call of exec."), _("\ | |
9409 | Show debugger response to a program call of exec."), _("\ | |
9410 | An exec call replaces the program image of a process.\n\ | |
9411 | \n\ | |
9412 | follow-exec-mode can be:\n\ | |
9413 | \n\ | |
cce7e648 | 9414 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9415 | to this new inferior. The program the process was running before\n\ |
9416 | the exec call can be restarted afterwards by restarting the original\n\ | |
9417 | inferior.\n\ | |
9418 | \n\ | |
9419 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9420 | The new executable image replaces the previous executable loaded in\n\ | |
9421 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9422 | the executable the process was running after the exec call.\n\ | |
9423 | \n\ | |
9424 | By default, the debugger will use the same inferior."), | |
9425 | NULL, | |
9426 | show_follow_exec_mode_string, | |
9427 | &setlist, &showlist); | |
9428 | ||
7ab04401 AC |
9429 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9430 | scheduler_enums, &scheduler_mode, _("\ | |
9431 | Set mode for locking scheduler during execution."), _("\ | |
9432 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9433 | off == no locking (threads may preempt at any time)\n\ |
9434 | on == full locking (no thread except the current thread may run)\n\ | |
9435 | This applies to both normal execution and replay mode.\n\ | |
9436 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9437 | In this mode, other threads may run during other commands.\n\ | |
9438 | This applies to both normal execution and replay mode.\n\ | |
9439 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9440 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9441 | show_scheduler_mode, |
7ab04401 | 9442 | &setlist, &showlist); |
5fbbeb29 | 9443 | |
d4db2f36 PA |
9444 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9445 | Set mode for resuming threads of all processes."), _("\ | |
9446 | Show mode for resuming threads of all processes."), _("\ | |
9447 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9448 | threads of all processes. When off (which is the default), execution\n\ | |
9449 | commands only resume the threads of the current process. The set of\n\ | |
9450 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9451 | mode (see help set scheduler-locking)."), | |
9452 | NULL, | |
9453 | show_schedule_multiple, | |
9454 | &setlist, &showlist); | |
9455 | ||
5bf193a2 AC |
9456 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9457 | Set mode of the step operation."), _("\ | |
9458 | Show mode of the step operation."), _("\ | |
9459 | When set, doing a step over a function without debug line information\n\ | |
9460 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9461 | function is skipped and the step command stops at a different source line."), | |
9462 | NULL, | |
920d2a44 | 9463 | show_step_stop_if_no_debug, |
5bf193a2 | 9464 | &setlist, &showlist); |
ca6724c1 | 9465 | |
72d0e2c5 YQ |
9466 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9467 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9468 | Set debugger's willingness to use displaced stepping."), _("\ |
9469 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9470 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9471 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9472 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9473 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9474 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9475 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9476 | NULL, |
9477 | show_can_use_displaced_stepping, | |
9478 | &setlist, &showlist); | |
237fc4c9 | 9479 | |
b2175913 MS |
9480 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9481 | &exec_direction, _("Set direction of execution.\n\ | |
9482 | Options are 'forward' or 'reverse'."), | |
9483 | _("Show direction of execution (forward/reverse)."), | |
9484 | _("Tells gdb whether to execute forward or backward."), | |
9485 | set_exec_direction_func, show_exec_direction_func, | |
9486 | &setlist, &showlist); | |
9487 | ||
6c95b8df PA |
9488 | /* Set/show detach-on-fork: user-settable mode. */ |
9489 | ||
9490 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9491 | Set whether gdb will detach the child of a fork."), _("\ | |
9492 | Show whether gdb will detach the child of a fork."), _("\ | |
9493 | Tells gdb whether to detach the child of a fork."), | |
9494 | NULL, NULL, &setlist, &showlist); | |
9495 | ||
03583c20 UW |
9496 | /* Set/show disable address space randomization mode. */ |
9497 | ||
9498 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9499 | &disable_randomization, _("\ | |
9500 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9501 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9502 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9503 | address space is disabled. Standalone programs run with the randomization\n\ | |
9504 | enabled by default on some platforms."), | |
9505 | &set_disable_randomization, | |
9506 | &show_disable_randomization, | |
9507 | &setlist, &showlist); | |
9508 | ||
ca6724c1 | 9509 | /* ptid initializations */ |
ca6724c1 KB |
9510 | inferior_ptid = null_ptid; |
9511 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9512 | |
76727919 TT |
9513 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed); |
9514 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested); | |
9515 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit); | |
9516 | gdb::observers::inferior_exit.attach (infrun_inferior_exit); | |
4aa995e1 PA |
9517 | |
9518 | /* Explicitly create without lookup, since that tries to create a | |
9519 | value with a void typed value, and when we get here, gdbarch | |
9520 | isn't initialized yet. At this point, we're quite sure there | |
9521 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9522 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9523 | |
9524 | add_setshow_boolean_cmd ("observer", no_class, | |
9525 | &observer_mode_1, _("\ | |
9526 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9527 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9528 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9529 | affect its execution. Registers and memory may not be changed,\n\ | |
9530 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9531 | or signalled."), | |
9532 | set_observer_mode, | |
9533 | show_observer_mode, | |
9534 | &setlist, | |
9535 | &showlist); | |
c906108c | 9536 | } |