Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
b811d2c2 | 4 | Copyright (C) 1986-2020 Free Software Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 11 | (at your option) any later version. |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | #include "defs.h" | |
e088209c | 22 | #include "displaced-stepping.h" |
4100594e SM |
23 | #include "gdbsupport/common-defs.h" |
24 | #include "gdbsupport/common-utils.h" | |
45741a9c | 25 | #include "infrun.h" |
c906108c SS |
26 | #include <ctype.h> |
27 | #include "symtab.h" | |
28 | #include "frame.h" | |
29 | #include "inferior.h" | |
30 | #include "breakpoint.h" | |
c906108c SS |
31 | #include "gdbcore.h" |
32 | #include "gdbcmd.h" | |
33 | #include "target.h" | |
2f4fcf00 | 34 | #include "target-connection.h" |
c906108c SS |
35 | #include "gdbthread.h" |
36 | #include "annotate.h" | |
1adeb98a | 37 | #include "symfile.h" |
7a292a7a | 38 | #include "top.h" |
2acceee2 | 39 | #include "inf-loop.h" |
4e052eda | 40 | #include "regcache.h" |
e088209c | 41 | #include "utils.h" |
fd0407d6 | 42 | #include "value.h" |
76727919 | 43 | #include "observable.h" |
f636b87d | 44 | #include "language.h" |
a77053c2 | 45 | #include "solib.h" |
f17517ea | 46 | #include "main.h" |
186c406b | 47 | #include "block.h" |
034dad6f | 48 | #include "mi/mi-common.h" |
4f8d22e3 | 49 | #include "event-top.h" |
96429cc8 | 50 | #include "record.h" |
d02ed0bb | 51 | #include "record-full.h" |
edb3359d | 52 | #include "inline-frame.h" |
4efc6507 | 53 | #include "jit.h" |
06cd862c | 54 | #include "tracepoint.h" |
1bfeeb0f | 55 | #include "skip.h" |
28106bc2 SDJ |
56 | #include "probe.h" |
57 | #include "objfiles.h" | |
de0bea00 | 58 | #include "completer.h" |
9107fc8d | 59 | #include "target-descriptions.h" |
f15cb84a | 60 | #include "target-dcache.h" |
d83ad864 | 61 | #include "terminal.h" |
ff862be4 | 62 | #include "solist.h" |
400b5eca | 63 | #include "gdbsupport/event-loop.h" |
243a9253 | 64 | #include "thread-fsm.h" |
268a13a5 | 65 | #include "gdbsupport/enum-flags.h" |
5ed8105e | 66 | #include "progspace-and-thread.h" |
268a13a5 | 67 | #include "gdbsupport/gdb_optional.h" |
46a62268 | 68 | #include "arch-utils.h" |
268a13a5 TT |
69 | #include "gdbsupport/scope-exit.h" |
70 | #include "gdbsupport/forward-scope-exit.h" | |
06cc9596 | 71 | #include "gdbsupport/gdb_select.h" |
5b6d1e4f | 72 | #include <unordered_map> |
93b54c8e | 73 | #include "async-event.h" |
c906108c SS |
74 | |
75 | /* Prototypes for local functions */ | |
76 | ||
2ea28649 | 77 | static void sig_print_info (enum gdb_signal); |
c906108c | 78 | |
96baa820 | 79 | static void sig_print_header (void); |
c906108c | 80 | |
d83ad864 DB |
81 | static void follow_inferior_reset_breakpoints (void); |
82 | ||
a289b8f6 JK |
83 | static int currently_stepping (struct thread_info *tp); |
84 | ||
2c03e5be | 85 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
86 | |
87 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
88 | ||
2484c66b UW |
89 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
90 | ||
8550d3b3 YQ |
91 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
92 | ||
aff4e175 AB |
93 | static void resume (gdb_signal sig); |
94 | ||
5b6d1e4f PA |
95 | static void wait_for_inferior (inferior *inf); |
96 | ||
372316f1 PA |
97 | /* Asynchronous signal handler registered as event loop source for |
98 | when we have pending events ready to be passed to the core. */ | |
99 | static struct async_event_handler *infrun_async_inferior_event_token; | |
100 | ||
101 | /* Stores whether infrun_async was previously enabled or disabled. | |
102 | Starts off as -1, indicating "never enabled/disabled". */ | |
103 | static int infrun_is_async = -1; | |
104 | ||
4100594e SM |
105 | #define infrun_log_debug(fmt, args...) \ |
106 | infrun_log_debug_1 (__LINE__, __func__, fmt, ##args) | |
107 | ||
108 | static void ATTRIBUTE_PRINTF(3, 4) | |
109 | infrun_log_debug_1 (int line, const char *func, | |
110 | const char *fmt, ...) | |
111 | { | |
112 | if (debug_infrun) | |
113 | { | |
114 | va_list args; | |
115 | va_start (args, fmt); | |
116 | std::string msg = string_vprintf (fmt, args); | |
117 | va_end (args); | |
118 | ||
119 | fprintf_unfiltered (gdb_stdout, "infrun: %s: %s\n", func, msg.c_str ()); | |
120 | } | |
121 | } | |
122 | ||
372316f1 PA |
123 | /* See infrun.h. */ |
124 | ||
125 | void | |
126 | infrun_async (int enable) | |
127 | { | |
128 | if (infrun_is_async != enable) | |
129 | { | |
130 | infrun_is_async = enable; | |
131 | ||
4100594e | 132 | infrun_log_debug ("enable=%d", enable); |
372316f1 PA |
133 | |
134 | if (enable) | |
135 | mark_async_event_handler (infrun_async_inferior_event_token); | |
136 | else | |
137 | clear_async_event_handler (infrun_async_inferior_event_token); | |
138 | } | |
139 | } | |
140 | ||
0b333c5e PA |
141 | /* See infrun.h. */ |
142 | ||
143 | void | |
144 | mark_infrun_async_event_handler (void) | |
145 | { | |
146 | mark_async_event_handler (infrun_async_inferior_event_token); | |
147 | } | |
148 | ||
5fbbeb29 CF |
149 | /* When set, stop the 'step' command if we enter a function which has |
150 | no line number information. The normal behavior is that we step | |
151 | over such function. */ | |
491144b5 | 152 | bool step_stop_if_no_debug = false; |
920d2a44 AC |
153 | static void |
154 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
155 | struct cmd_list_element *c, const char *value) | |
156 | { | |
157 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
158 | } | |
5fbbeb29 | 159 | |
b9f437de PA |
160 | /* proceed and normal_stop use this to notify the user when the |
161 | inferior stopped in a different thread than it had been running | |
162 | in. */ | |
96baa820 | 163 | |
39f77062 | 164 | static ptid_t previous_inferior_ptid; |
7a292a7a | 165 | |
07107ca6 LM |
166 | /* If set (default for legacy reasons), when following a fork, GDB |
167 | will detach from one of the fork branches, child or parent. | |
168 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
169 | setting. */ | |
170 | ||
491144b5 | 171 | static bool detach_fork = true; |
6c95b8df | 172 | |
491144b5 | 173 | bool debug_displaced = false; |
237fc4c9 PA |
174 | static void |
175 | show_debug_displaced (struct ui_file *file, int from_tty, | |
176 | struct cmd_list_element *c, const char *value) | |
177 | { | |
178 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
179 | } | |
180 | ||
ccce17b0 | 181 | unsigned int debug_infrun = 0; |
920d2a44 AC |
182 | static void |
183 | show_debug_infrun (struct ui_file *file, int from_tty, | |
184 | struct cmd_list_element *c, const char *value) | |
185 | { | |
186 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
187 | } | |
527159b7 | 188 | |
03583c20 UW |
189 | |
190 | /* Support for disabling address space randomization. */ | |
191 | ||
491144b5 | 192 | bool disable_randomization = true; |
03583c20 UW |
193 | |
194 | static void | |
195 | show_disable_randomization (struct ui_file *file, int from_tty, | |
196 | struct cmd_list_element *c, const char *value) | |
197 | { | |
198 | if (target_supports_disable_randomization ()) | |
199 | fprintf_filtered (file, | |
200 | _("Disabling randomization of debuggee's " | |
201 | "virtual address space is %s.\n"), | |
202 | value); | |
203 | else | |
204 | fputs_filtered (_("Disabling randomization of debuggee's " | |
205 | "virtual address space is unsupported on\n" | |
206 | "this platform.\n"), file); | |
207 | } | |
208 | ||
209 | static void | |
eb4c3f4a | 210 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
211 | struct cmd_list_element *c) |
212 | { | |
213 | if (!target_supports_disable_randomization ()) | |
214 | error (_("Disabling randomization of debuggee's " | |
215 | "virtual address space is unsupported on\n" | |
216 | "this platform.")); | |
217 | } | |
218 | ||
d32dc48e PA |
219 | /* User interface for non-stop mode. */ |
220 | ||
491144b5 CB |
221 | bool non_stop = false; |
222 | static bool non_stop_1 = false; | |
d32dc48e PA |
223 | |
224 | static void | |
eb4c3f4a | 225 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
226 | struct cmd_list_element *c) |
227 | { | |
228 | if (target_has_execution) | |
229 | { | |
230 | non_stop_1 = non_stop; | |
231 | error (_("Cannot change this setting while the inferior is running.")); | |
232 | } | |
233 | ||
234 | non_stop = non_stop_1; | |
235 | } | |
236 | ||
237 | static void | |
238 | show_non_stop (struct ui_file *file, int from_tty, | |
239 | struct cmd_list_element *c, const char *value) | |
240 | { | |
241 | fprintf_filtered (file, | |
242 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
243 | value); | |
244 | } | |
245 | ||
d914c394 SS |
246 | /* "Observer mode" is somewhat like a more extreme version of |
247 | non-stop, in which all GDB operations that might affect the | |
248 | target's execution have been disabled. */ | |
249 | ||
491144b5 CB |
250 | bool observer_mode = false; |
251 | static bool observer_mode_1 = false; | |
d914c394 SS |
252 | |
253 | static void | |
eb4c3f4a | 254 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
255 | struct cmd_list_element *c) |
256 | { | |
d914c394 SS |
257 | if (target_has_execution) |
258 | { | |
259 | observer_mode_1 = observer_mode; | |
260 | error (_("Cannot change this setting while the inferior is running.")); | |
261 | } | |
262 | ||
263 | observer_mode = observer_mode_1; | |
264 | ||
265 | may_write_registers = !observer_mode; | |
266 | may_write_memory = !observer_mode; | |
267 | may_insert_breakpoints = !observer_mode; | |
268 | may_insert_tracepoints = !observer_mode; | |
269 | /* We can insert fast tracepoints in or out of observer mode, | |
270 | but enable them if we're going into this mode. */ | |
271 | if (observer_mode) | |
491144b5 | 272 | may_insert_fast_tracepoints = true; |
d914c394 SS |
273 | may_stop = !observer_mode; |
274 | update_target_permissions (); | |
275 | ||
276 | /* Going *into* observer mode we must force non-stop, then | |
277 | going out we leave it that way. */ | |
278 | if (observer_mode) | |
279 | { | |
d914c394 | 280 | pagination_enabled = 0; |
491144b5 | 281 | non_stop = non_stop_1 = true; |
d914c394 SS |
282 | } |
283 | ||
284 | if (from_tty) | |
285 | printf_filtered (_("Observer mode is now %s.\n"), | |
286 | (observer_mode ? "on" : "off")); | |
287 | } | |
288 | ||
289 | static void | |
290 | show_observer_mode (struct ui_file *file, int from_tty, | |
291 | struct cmd_list_element *c, const char *value) | |
292 | { | |
293 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
294 | } | |
295 | ||
296 | /* This updates the value of observer mode based on changes in | |
297 | permissions. Note that we are deliberately ignoring the values of | |
298 | may-write-registers and may-write-memory, since the user may have | |
299 | reason to enable these during a session, for instance to turn on a | |
300 | debugging-related global. */ | |
301 | ||
302 | void | |
303 | update_observer_mode (void) | |
304 | { | |
491144b5 CB |
305 | bool newval = (!may_insert_breakpoints |
306 | && !may_insert_tracepoints | |
307 | && may_insert_fast_tracepoints | |
308 | && !may_stop | |
309 | && non_stop); | |
d914c394 SS |
310 | |
311 | /* Let the user know if things change. */ | |
312 | if (newval != observer_mode) | |
313 | printf_filtered (_("Observer mode is now %s.\n"), | |
314 | (newval ? "on" : "off")); | |
315 | ||
316 | observer_mode = observer_mode_1 = newval; | |
317 | } | |
c2c6d25f | 318 | |
c906108c SS |
319 | /* Tables of how to react to signals; the user sets them. */ |
320 | ||
adc6a863 PA |
321 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
322 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
323 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 324 | |
ab04a2af TT |
325 | /* Table of signals that are registered with "catch signal". A |
326 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
327 | signal" command. */ |
328 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 329 | |
2455069d UW |
330 | /* Table of signals that the target may silently handle. |
331 | This is automatically determined from the flags above, | |
332 | and simply cached here. */ | |
adc6a863 | 333 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 334 | |
c906108c SS |
335 | #define SET_SIGS(nsigs,sigs,flags) \ |
336 | do { \ | |
337 | int signum = (nsigs); \ | |
338 | while (signum-- > 0) \ | |
339 | if ((sigs)[signum]) \ | |
340 | (flags)[signum] = 1; \ | |
341 | } while (0) | |
342 | ||
343 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
344 | do { \ | |
345 | int signum = (nsigs); \ | |
346 | while (signum-- > 0) \ | |
347 | if ((sigs)[signum]) \ | |
348 | (flags)[signum] = 0; \ | |
349 | } while (0) | |
350 | ||
9b224c5e PA |
351 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
352 | this function is to avoid exporting `signal_program'. */ | |
353 | ||
354 | void | |
355 | update_signals_program_target (void) | |
356 | { | |
adc6a863 | 357 | target_program_signals (signal_program); |
9b224c5e PA |
358 | } |
359 | ||
1777feb0 | 360 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 361 | |
edb3359d | 362 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
363 | |
364 | /* Command list pointer for the "stop" placeholder. */ | |
365 | ||
366 | static struct cmd_list_element *stop_command; | |
367 | ||
c906108c SS |
368 | /* Nonzero if we want to give control to the user when we're notified |
369 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 370 | int stop_on_solib_events; |
f9e14852 GB |
371 | |
372 | /* Enable or disable optional shared library event breakpoints | |
373 | as appropriate when the above flag is changed. */ | |
374 | ||
375 | static void | |
eb4c3f4a TT |
376 | set_stop_on_solib_events (const char *args, |
377 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
378 | { |
379 | update_solib_breakpoints (); | |
380 | } | |
381 | ||
920d2a44 AC |
382 | static void |
383 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
384 | struct cmd_list_element *c, const char *value) | |
385 | { | |
386 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
387 | value); | |
388 | } | |
c906108c | 389 | |
c906108c SS |
390 | /* Nonzero after stop if current stack frame should be printed. */ |
391 | ||
392 | static int stop_print_frame; | |
393 | ||
5b6d1e4f PA |
394 | /* This is a cached copy of the target/ptid/waitstatus of the last |
395 | event returned by target_wait()/deprecated_target_wait_hook(). | |
396 | This information is returned by get_last_target_status(). */ | |
397 | static process_stratum_target *target_last_proc_target; | |
39f77062 | 398 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
399 | static struct target_waitstatus target_last_waitstatus; |
400 | ||
4e1c45ea | 401 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 402 | |
53904c9e AC |
403 | static const char follow_fork_mode_child[] = "child"; |
404 | static const char follow_fork_mode_parent[] = "parent"; | |
405 | ||
40478521 | 406 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
407 | follow_fork_mode_child, |
408 | follow_fork_mode_parent, | |
409 | NULL | |
ef346e04 | 410 | }; |
c906108c | 411 | |
53904c9e | 412 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
413 | static void |
414 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
415 | struct cmd_list_element *c, const char *value) | |
416 | { | |
3e43a32a MS |
417 | fprintf_filtered (file, |
418 | _("Debugger response to a program " | |
419 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
420 | value); |
421 | } | |
c906108c SS |
422 | \f |
423 | ||
d83ad864 DB |
424 | /* Handle changes to the inferior list based on the type of fork, |
425 | which process is being followed, and whether the other process | |
426 | should be detached. On entry inferior_ptid must be the ptid of | |
427 | the fork parent. At return inferior_ptid is the ptid of the | |
428 | followed inferior. */ | |
429 | ||
5ab2fbf1 SM |
430 | static bool |
431 | follow_fork_inferior (bool follow_child, bool detach_fork) | |
d83ad864 DB |
432 | { |
433 | int has_vforked; | |
79639e11 | 434 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
435 | |
436 | has_vforked = (inferior_thread ()->pending_follow.kind | |
437 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
438 | parent_ptid = inferior_ptid; |
439 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
440 | |
441 | if (has_vforked | |
442 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 443 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
444 | && !(follow_child || detach_fork || sched_multi)) |
445 | { | |
446 | /* The parent stays blocked inside the vfork syscall until the | |
447 | child execs or exits. If we don't let the child run, then | |
448 | the parent stays blocked. If we're telling the parent to run | |
449 | in the foreground, the user will not be able to ctrl-c to get | |
450 | back the terminal, effectively hanging the debug session. */ | |
451 | fprintf_filtered (gdb_stderr, _("\ | |
452 | Can not resume the parent process over vfork in the foreground while\n\ | |
453 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
454 | \"set schedule-multiple\".\n")); | |
d83ad864 DB |
455 | return 1; |
456 | } | |
457 | ||
458 | if (!follow_child) | |
459 | { | |
460 | /* Detach new forked process? */ | |
461 | if (detach_fork) | |
462 | { | |
d83ad864 DB |
463 | /* Before detaching from the child, remove all breakpoints |
464 | from it. If we forked, then this has already been taken | |
465 | care of by infrun.c. If we vforked however, any | |
466 | breakpoint inserted in the parent is visible in the | |
467 | child, even those added while stopped in a vfork | |
468 | catchpoint. This will remove the breakpoints from the | |
469 | parent also, but they'll be reinserted below. */ | |
470 | if (has_vforked) | |
471 | { | |
472 | /* Keep breakpoints list in sync. */ | |
00431a78 | 473 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
474 | } |
475 | ||
f67c0c91 | 476 | if (print_inferior_events) |
d83ad864 | 477 | { |
8dd06f7a | 478 | /* Ensure that we have a process ptid. */ |
e99b03dc | 479 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 480 | |
223ffa71 | 481 | target_terminal::ours_for_output (); |
d83ad864 | 482 | fprintf_filtered (gdb_stdlog, |
f67c0c91 | 483 | _("[Detaching after %s from child %s]\n"), |
6f259a23 | 484 | has_vforked ? "vfork" : "fork", |
a068643d | 485 | target_pid_to_str (process_ptid).c_str ()); |
d83ad864 DB |
486 | } |
487 | } | |
488 | else | |
489 | { | |
490 | struct inferior *parent_inf, *child_inf; | |
d83ad864 DB |
491 | |
492 | /* Add process to GDB's tables. */ | |
e99b03dc | 493 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
494 | |
495 | parent_inf = current_inferior (); | |
496 | child_inf->attach_flag = parent_inf->attach_flag; | |
497 | copy_terminal_info (child_inf, parent_inf); | |
498 | child_inf->gdbarch = parent_inf->gdbarch; | |
499 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
500 | ||
5ed8105e | 501 | scoped_restore_current_pspace_and_thread restore_pspace_thread; |
d83ad864 | 502 | |
2a00d7ce | 503 | set_current_inferior (child_inf); |
5b6d1e4f | 504 | switch_to_no_thread (); |
d83ad864 | 505 | child_inf->symfile_flags = SYMFILE_NO_READ; |
5b6d1e4f PA |
506 | push_target (parent_inf->process_target ()); |
507 | add_thread_silent (child_inf->process_target (), child_ptid); | |
508 | inferior_ptid = child_ptid; | |
d83ad864 DB |
509 | |
510 | /* If this is a vfork child, then the address-space is | |
511 | shared with the parent. */ | |
512 | if (has_vforked) | |
513 | { | |
514 | child_inf->pspace = parent_inf->pspace; | |
515 | child_inf->aspace = parent_inf->aspace; | |
516 | ||
5b6d1e4f PA |
517 | exec_on_vfork (); |
518 | ||
d83ad864 DB |
519 | /* The parent will be frozen until the child is done |
520 | with the shared region. Keep track of the | |
521 | parent. */ | |
522 | child_inf->vfork_parent = parent_inf; | |
523 | child_inf->pending_detach = 0; | |
524 | parent_inf->vfork_child = child_inf; | |
525 | parent_inf->pending_detach = 0; | |
526 | } | |
527 | else | |
528 | { | |
529 | child_inf->aspace = new_address_space (); | |
564b1e3f | 530 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
531 | child_inf->removable = 1; |
532 | set_current_program_space (child_inf->pspace); | |
533 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
534 | ||
535 | /* Let the shared library layer (e.g., solib-svr4) learn | |
536 | about this new process, relocate the cloned exec, pull | |
537 | in shared libraries, and install the solib event | |
538 | breakpoint. If a "cloned-VM" event was propagated | |
539 | better throughout the core, this wouldn't be | |
540 | required. */ | |
541 | solib_create_inferior_hook (0); | |
542 | } | |
d83ad864 DB |
543 | } |
544 | ||
545 | if (has_vforked) | |
546 | { | |
547 | struct inferior *parent_inf; | |
548 | ||
549 | parent_inf = current_inferior (); | |
550 | ||
551 | /* If we detached from the child, then we have to be careful | |
552 | to not insert breakpoints in the parent until the child | |
553 | is done with the shared memory region. However, if we're | |
554 | staying attached to the child, then we can and should | |
555 | insert breakpoints, so that we can debug it. A | |
556 | subsequent child exec or exit is enough to know when does | |
557 | the child stops using the parent's address space. */ | |
558 | parent_inf->waiting_for_vfork_done = detach_fork; | |
559 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
560 | } | |
561 | } | |
562 | else | |
563 | { | |
564 | /* Follow the child. */ | |
565 | struct inferior *parent_inf, *child_inf; | |
566 | struct program_space *parent_pspace; | |
567 | ||
f67c0c91 | 568 | if (print_inferior_events) |
d83ad864 | 569 | { |
f67c0c91 SDJ |
570 | std::string parent_pid = target_pid_to_str (parent_ptid); |
571 | std::string child_pid = target_pid_to_str (child_ptid); | |
572 | ||
223ffa71 | 573 | target_terminal::ours_for_output (); |
6f259a23 | 574 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
575 | _("[Attaching after %s %s to child %s]\n"), |
576 | parent_pid.c_str (), | |
6f259a23 | 577 | has_vforked ? "vfork" : "fork", |
f67c0c91 | 578 | child_pid.c_str ()); |
d83ad864 DB |
579 | } |
580 | ||
581 | /* Add the new inferior first, so that the target_detach below | |
582 | doesn't unpush the target. */ | |
583 | ||
e99b03dc | 584 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
585 | |
586 | parent_inf = current_inferior (); | |
587 | child_inf->attach_flag = parent_inf->attach_flag; | |
588 | copy_terminal_info (child_inf, parent_inf); | |
589 | child_inf->gdbarch = parent_inf->gdbarch; | |
590 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
591 | ||
592 | parent_pspace = parent_inf->pspace; | |
593 | ||
5b6d1e4f | 594 | process_stratum_target *target = parent_inf->process_target (); |
d83ad864 | 595 | |
5b6d1e4f PA |
596 | { |
597 | /* Hold a strong reference to the target while (maybe) | |
598 | detaching the parent. Otherwise detaching could close the | |
599 | target. */ | |
600 | auto target_ref = target_ops_ref::new_reference (target); | |
601 | ||
602 | /* If we're vforking, we want to hold on to the parent until | |
603 | the child exits or execs. At child exec or exit time we | |
604 | can remove the old breakpoints from the parent and detach | |
605 | or resume debugging it. Otherwise, detach the parent now; | |
606 | we'll want to reuse it's program/address spaces, but we | |
607 | can't set them to the child before removing breakpoints | |
608 | from the parent, otherwise, the breakpoints module could | |
609 | decide to remove breakpoints from the wrong process (since | |
610 | they'd be assigned to the same address space). */ | |
611 | ||
612 | if (has_vforked) | |
613 | { | |
614 | gdb_assert (child_inf->vfork_parent == NULL); | |
615 | gdb_assert (parent_inf->vfork_child == NULL); | |
616 | child_inf->vfork_parent = parent_inf; | |
617 | child_inf->pending_detach = 0; | |
618 | parent_inf->vfork_child = child_inf; | |
619 | parent_inf->pending_detach = detach_fork; | |
620 | parent_inf->waiting_for_vfork_done = 0; | |
621 | } | |
622 | else if (detach_fork) | |
623 | { | |
624 | if (print_inferior_events) | |
625 | { | |
626 | /* Ensure that we have a process ptid. */ | |
627 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
628 | ||
629 | target_terminal::ours_for_output (); | |
630 | fprintf_filtered (gdb_stdlog, | |
631 | _("[Detaching after fork from " | |
632 | "parent %s]\n"), | |
633 | target_pid_to_str (process_ptid).c_str ()); | |
634 | } | |
8dd06f7a | 635 | |
5b6d1e4f PA |
636 | target_detach (parent_inf, 0); |
637 | parent_inf = NULL; | |
638 | } | |
6f259a23 | 639 | |
5b6d1e4f | 640 | /* Note that the detach above makes PARENT_INF dangling. */ |
d83ad864 | 641 | |
5b6d1e4f PA |
642 | /* Add the child thread to the appropriate lists, and switch |
643 | to this new thread, before cloning the program space, and | |
644 | informing the solib layer about this new process. */ | |
d83ad864 | 645 | |
5b6d1e4f PA |
646 | set_current_inferior (child_inf); |
647 | push_target (target); | |
648 | } | |
d83ad864 | 649 | |
5b6d1e4f | 650 | add_thread_silent (target, child_ptid); |
79639e11 | 651 | inferior_ptid = child_ptid; |
d83ad864 DB |
652 | |
653 | /* If this is a vfork child, then the address-space is shared | |
654 | with the parent. If we detached from the parent, then we can | |
655 | reuse the parent's program/address spaces. */ | |
656 | if (has_vforked || detach_fork) | |
657 | { | |
658 | child_inf->pspace = parent_pspace; | |
659 | child_inf->aspace = child_inf->pspace->aspace; | |
5b6d1e4f PA |
660 | |
661 | exec_on_vfork (); | |
d83ad864 DB |
662 | } |
663 | else | |
664 | { | |
665 | child_inf->aspace = new_address_space (); | |
564b1e3f | 666 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
667 | child_inf->removable = 1; |
668 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
669 | set_current_program_space (child_inf->pspace); | |
670 | clone_program_space (child_inf->pspace, parent_pspace); | |
671 | ||
672 | /* Let the shared library layer (e.g., solib-svr4) learn | |
673 | about this new process, relocate the cloned exec, pull in | |
674 | shared libraries, and install the solib event breakpoint. | |
675 | If a "cloned-VM" event was propagated better throughout | |
676 | the core, this wouldn't be required. */ | |
677 | solib_create_inferior_hook (0); | |
678 | } | |
679 | } | |
680 | ||
681 | return target_follow_fork (follow_child, detach_fork); | |
682 | } | |
683 | ||
e58b0e63 PA |
684 | /* Tell the target to follow the fork we're stopped at. Returns true |
685 | if the inferior should be resumed; false, if the target for some | |
686 | reason decided it's best not to resume. */ | |
687 | ||
5ab2fbf1 SM |
688 | static bool |
689 | follow_fork () | |
c906108c | 690 | { |
5ab2fbf1 SM |
691 | bool follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
692 | bool should_resume = true; | |
e58b0e63 PA |
693 | struct thread_info *tp; |
694 | ||
695 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
696 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
697 | parent thread structure's run control related fields, not just these. |
698 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
699 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 700 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
701 | CORE_ADDR step_range_start = 0; |
702 | CORE_ADDR step_range_end = 0; | |
bf4cb9be TV |
703 | int current_line = 0; |
704 | symtab *current_symtab = NULL; | |
4e3990f4 | 705 | struct frame_id step_frame_id = { 0 }; |
8980e177 | 706 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
707 | |
708 | if (!non_stop) | |
709 | { | |
5b6d1e4f | 710 | process_stratum_target *wait_target; |
e58b0e63 PA |
711 | ptid_t wait_ptid; |
712 | struct target_waitstatus wait_status; | |
713 | ||
714 | /* Get the last target status returned by target_wait(). */ | |
5b6d1e4f | 715 | get_last_target_status (&wait_target, &wait_ptid, &wait_status); |
e58b0e63 PA |
716 | |
717 | /* If not stopped at a fork event, then there's nothing else to | |
718 | do. */ | |
719 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
720 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
721 | return 1; | |
722 | ||
723 | /* Check if we switched over from WAIT_PTID, since the event was | |
724 | reported. */ | |
00431a78 | 725 | if (wait_ptid != minus_one_ptid |
5b6d1e4f PA |
726 | && (current_inferior ()->process_target () != wait_target |
727 | || inferior_ptid != wait_ptid)) | |
e58b0e63 PA |
728 | { |
729 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
730 | target to follow it (in either direction). We'll | |
731 | afterwards refuse to resume, and inform the user what | |
732 | happened. */ | |
5b6d1e4f | 733 | thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid); |
00431a78 | 734 | switch_to_thread (wait_thread); |
5ab2fbf1 | 735 | should_resume = false; |
e58b0e63 PA |
736 | } |
737 | } | |
738 | ||
739 | tp = inferior_thread (); | |
740 | ||
741 | /* If there were any forks/vforks that were caught and are now to be | |
742 | followed, then do so now. */ | |
743 | switch (tp->pending_follow.kind) | |
744 | { | |
745 | case TARGET_WAITKIND_FORKED: | |
746 | case TARGET_WAITKIND_VFORKED: | |
747 | { | |
748 | ptid_t parent, child; | |
749 | ||
750 | /* If the user did a next/step, etc, over a fork call, | |
751 | preserve the stepping state in the fork child. */ | |
752 | if (follow_child && should_resume) | |
753 | { | |
8358c15c JK |
754 | step_resume_breakpoint = clone_momentary_breakpoint |
755 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
756 | step_range_start = tp->control.step_range_start; |
757 | step_range_end = tp->control.step_range_end; | |
bf4cb9be TV |
758 | current_line = tp->current_line; |
759 | current_symtab = tp->current_symtab; | |
16c381f0 | 760 | step_frame_id = tp->control.step_frame_id; |
186c406b TT |
761 | exception_resume_breakpoint |
762 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 763 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
764 | |
765 | /* For now, delete the parent's sr breakpoint, otherwise, | |
766 | parent/child sr breakpoints are considered duplicates, | |
767 | and the child version will not be installed. Remove | |
768 | this when the breakpoints module becomes aware of | |
769 | inferiors and address spaces. */ | |
770 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
771 | tp->control.step_range_start = 0; |
772 | tp->control.step_range_end = 0; | |
773 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 774 | delete_exception_resume_breakpoint (tp); |
8980e177 | 775 | tp->thread_fsm = NULL; |
e58b0e63 PA |
776 | } |
777 | ||
778 | parent = inferior_ptid; | |
779 | child = tp->pending_follow.value.related_pid; | |
780 | ||
5b6d1e4f | 781 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
782 | /* Set up inferior(s) as specified by the caller, and tell the |
783 | target to do whatever is necessary to follow either parent | |
784 | or child. */ | |
785 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
786 | { |
787 | /* Target refused to follow, or there's some other reason | |
788 | we shouldn't resume. */ | |
789 | should_resume = 0; | |
790 | } | |
791 | else | |
792 | { | |
793 | /* This pending follow fork event is now handled, one way | |
794 | or another. The previous selected thread may be gone | |
795 | from the lists by now, but if it is still around, need | |
796 | to clear the pending follow request. */ | |
5b6d1e4f | 797 | tp = find_thread_ptid (parent_targ, parent); |
e58b0e63 PA |
798 | if (tp) |
799 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
800 | ||
801 | /* This makes sure we don't try to apply the "Switched | |
802 | over from WAIT_PID" logic above. */ | |
803 | nullify_last_target_wait_ptid (); | |
804 | ||
1777feb0 | 805 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
806 | if (follow_child) |
807 | { | |
5b6d1e4f | 808 | thread_info *child_thr = find_thread_ptid (parent_targ, child); |
00431a78 | 809 | switch_to_thread (child_thr); |
e58b0e63 PA |
810 | |
811 | /* ... and preserve the stepping state, in case the | |
812 | user was stepping over the fork call. */ | |
813 | if (should_resume) | |
814 | { | |
815 | tp = inferior_thread (); | |
8358c15c JK |
816 | tp->control.step_resume_breakpoint |
817 | = step_resume_breakpoint; | |
16c381f0 JK |
818 | tp->control.step_range_start = step_range_start; |
819 | tp->control.step_range_end = step_range_end; | |
bf4cb9be TV |
820 | tp->current_line = current_line; |
821 | tp->current_symtab = current_symtab; | |
16c381f0 | 822 | tp->control.step_frame_id = step_frame_id; |
186c406b TT |
823 | tp->control.exception_resume_breakpoint |
824 | = exception_resume_breakpoint; | |
8980e177 | 825 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
826 | } |
827 | else | |
828 | { | |
829 | /* If we get here, it was because we're trying to | |
830 | resume from a fork catchpoint, but, the user | |
831 | has switched threads away from the thread that | |
832 | forked. In that case, the resume command | |
833 | issued is most likely not applicable to the | |
834 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 835 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 836 | "before following fork child.")); |
e58b0e63 PA |
837 | } |
838 | ||
839 | /* Reset breakpoints in the child as appropriate. */ | |
840 | follow_inferior_reset_breakpoints (); | |
841 | } | |
e58b0e63 PA |
842 | } |
843 | } | |
844 | break; | |
845 | case TARGET_WAITKIND_SPURIOUS: | |
846 | /* Nothing to follow. */ | |
847 | break; | |
848 | default: | |
849 | internal_error (__FILE__, __LINE__, | |
850 | "Unexpected pending_follow.kind %d\n", | |
851 | tp->pending_follow.kind); | |
852 | break; | |
853 | } | |
c906108c | 854 | |
e58b0e63 | 855 | return should_resume; |
c906108c SS |
856 | } |
857 | ||
d83ad864 | 858 | static void |
6604731b | 859 | follow_inferior_reset_breakpoints (void) |
c906108c | 860 | { |
4e1c45ea PA |
861 | struct thread_info *tp = inferior_thread (); |
862 | ||
6604731b DJ |
863 | /* Was there a step_resume breakpoint? (There was if the user |
864 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
865 | thread number. Cloned step_resume breakpoints are disabled on |
866 | creation, so enable it here now that it is associated with the | |
867 | correct thread. | |
6604731b DJ |
868 | |
869 | step_resumes are a form of bp that are made to be per-thread. | |
870 | Since we created the step_resume bp when the parent process | |
871 | was being debugged, and now are switching to the child process, | |
872 | from the breakpoint package's viewpoint, that's a switch of | |
873 | "threads". We must update the bp's notion of which thread | |
874 | it is for, or it'll be ignored when it triggers. */ | |
875 | ||
8358c15c | 876 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
877 | { |
878 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
879 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
880 | } | |
6604731b | 881 | |
a1aa2221 | 882 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 883 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
884 | { |
885 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
886 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
887 | } | |
186c406b | 888 | |
6604731b DJ |
889 | /* Reinsert all breakpoints in the child. The user may have set |
890 | breakpoints after catching the fork, in which case those | |
891 | were never set in the child, but only in the parent. This makes | |
892 | sure the inserted breakpoints match the breakpoint list. */ | |
893 | ||
894 | breakpoint_re_set (); | |
895 | insert_breakpoints (); | |
c906108c | 896 | } |
c906108c | 897 | |
6c95b8df PA |
898 | /* The child has exited or execed: resume threads of the parent the |
899 | user wanted to be executing. */ | |
900 | ||
901 | static int | |
902 | proceed_after_vfork_done (struct thread_info *thread, | |
903 | void *arg) | |
904 | { | |
905 | int pid = * (int *) arg; | |
906 | ||
00431a78 PA |
907 | if (thread->ptid.pid () == pid |
908 | && thread->state == THREAD_RUNNING | |
909 | && !thread->executing | |
6c95b8df | 910 | && !thread->stop_requested |
a493e3e2 | 911 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df | 912 | { |
4100594e SM |
913 | infrun_log_debug ("resuming vfork parent thread %s", |
914 | target_pid_to_str (thread->ptid).c_str ()); | |
6c95b8df | 915 | |
00431a78 | 916 | switch_to_thread (thread); |
70509625 | 917 | clear_proceed_status (0); |
64ce06e4 | 918 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
919 | } |
920 | ||
921 | return 0; | |
922 | } | |
923 | ||
5ed8105e PA |
924 | /* Save/restore inferior_ptid, current program space and current |
925 | inferior. Only use this if the current context points at an exited | |
926 | inferior (and therefore there's no current thread to save). */ | |
927 | class scoped_restore_exited_inferior | |
928 | { | |
929 | public: | |
930 | scoped_restore_exited_inferior () | |
931 | : m_saved_ptid (&inferior_ptid) | |
932 | {} | |
933 | ||
934 | private: | |
935 | scoped_restore_tmpl<ptid_t> m_saved_ptid; | |
936 | scoped_restore_current_program_space m_pspace; | |
937 | scoped_restore_current_inferior m_inferior; | |
938 | }; | |
939 | ||
6c95b8df PA |
940 | /* Called whenever we notice an exec or exit event, to handle |
941 | detaching or resuming a vfork parent. */ | |
942 | ||
943 | static void | |
944 | handle_vfork_child_exec_or_exit (int exec) | |
945 | { | |
946 | struct inferior *inf = current_inferior (); | |
947 | ||
948 | if (inf->vfork_parent) | |
949 | { | |
950 | int resume_parent = -1; | |
951 | ||
952 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
953 | between the parent and the child. Break the bonds. */ |
954 | inferior *vfork_parent = inf->vfork_parent; | |
955 | inf->vfork_parent->vfork_child = NULL; | |
956 | inf->vfork_parent = NULL; | |
6c95b8df | 957 | |
b73715df TV |
958 | /* If the user wanted to detach from the parent, now is the |
959 | time. */ | |
960 | if (vfork_parent->pending_detach) | |
6c95b8df PA |
961 | { |
962 | struct thread_info *tp; | |
6c95b8df PA |
963 | struct program_space *pspace; |
964 | struct address_space *aspace; | |
965 | ||
1777feb0 | 966 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 967 | |
b73715df | 968 | vfork_parent->pending_detach = 0; |
68c9da30 | 969 | |
5ed8105e PA |
970 | gdb::optional<scoped_restore_exited_inferior> |
971 | maybe_restore_inferior; | |
972 | gdb::optional<scoped_restore_current_pspace_and_thread> | |
973 | maybe_restore_thread; | |
974 | ||
975 | /* If we're handling a child exit, then inferior_ptid points | |
976 | at the inferior's pid, not to a thread. */ | |
f50f4e56 | 977 | if (!exec) |
5ed8105e | 978 | maybe_restore_inferior.emplace (); |
f50f4e56 | 979 | else |
5ed8105e | 980 | maybe_restore_thread.emplace (); |
6c95b8df PA |
981 | |
982 | /* We're letting loose of the parent. */ | |
b73715df | 983 | tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 984 | switch_to_thread (tp); |
6c95b8df PA |
985 | |
986 | /* We're about to detach from the parent, which implicitly | |
987 | removes breakpoints from its address space. There's a | |
988 | catch here: we want to reuse the spaces for the child, | |
989 | but, parent/child are still sharing the pspace at this | |
990 | point, although the exec in reality makes the kernel give | |
991 | the child a fresh set of new pages. The problem here is | |
992 | that the breakpoints module being unaware of this, would | |
993 | likely chose the child process to write to the parent | |
994 | address space. Swapping the child temporarily away from | |
995 | the spaces has the desired effect. Yes, this is "sort | |
996 | of" a hack. */ | |
997 | ||
998 | pspace = inf->pspace; | |
999 | aspace = inf->aspace; | |
1000 | inf->aspace = NULL; | |
1001 | inf->pspace = NULL; | |
1002 | ||
f67c0c91 | 1003 | if (print_inferior_events) |
6c95b8df | 1004 | { |
a068643d | 1005 | std::string pidstr |
b73715df | 1006 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 1007 | |
223ffa71 | 1008 | target_terminal::ours_for_output (); |
6c95b8df PA |
1009 | |
1010 | if (exec) | |
6f259a23 DB |
1011 | { |
1012 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 1013 | _("[Detaching vfork parent %s " |
a068643d | 1014 | "after child exec]\n"), pidstr.c_str ()); |
6f259a23 | 1015 | } |
6c95b8df | 1016 | else |
6f259a23 DB |
1017 | { |
1018 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 1019 | _("[Detaching vfork parent %s " |
a068643d | 1020 | "after child exit]\n"), pidstr.c_str ()); |
6f259a23 | 1021 | } |
6c95b8df PA |
1022 | } |
1023 | ||
b73715df | 1024 | target_detach (vfork_parent, 0); |
6c95b8df PA |
1025 | |
1026 | /* Put it back. */ | |
1027 | inf->pspace = pspace; | |
1028 | inf->aspace = aspace; | |
6c95b8df PA |
1029 | } |
1030 | else if (exec) | |
1031 | { | |
1032 | /* We're staying attached to the parent, so, really give the | |
1033 | child a new address space. */ | |
564b1e3f | 1034 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
1035 | inf->aspace = inf->pspace->aspace; |
1036 | inf->removable = 1; | |
1037 | set_current_program_space (inf->pspace); | |
1038 | ||
b73715df | 1039 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1040 | } |
1041 | else | |
1042 | { | |
6c95b8df PA |
1043 | /* If this is a vfork child exiting, then the pspace and |
1044 | aspaces were shared with the parent. Since we're | |
1045 | reporting the process exit, we'll be mourning all that is | |
1046 | found in the address space, and switching to null_ptid, | |
1047 | preparing to start a new inferior. But, since we don't | |
1048 | want to clobber the parent's address/program spaces, we | |
1049 | go ahead and create a new one for this exiting | |
1050 | inferior. */ | |
1051 | ||
5ed8105e PA |
1052 | /* Switch to null_ptid while running clone_program_space, so |
1053 | that clone_program_space doesn't want to read the | |
1054 | selected frame of a dead process. */ | |
1055 | scoped_restore restore_ptid | |
1056 | = make_scoped_restore (&inferior_ptid, null_ptid); | |
6c95b8df | 1057 | |
53af73bf PA |
1058 | inf->pspace = new program_space (maybe_new_address_space ()); |
1059 | inf->aspace = inf->pspace->aspace; | |
1060 | set_current_program_space (inf->pspace); | |
6c95b8df | 1061 | inf->removable = 1; |
7dcd53a0 | 1062 | inf->symfile_flags = SYMFILE_NO_READ; |
53af73bf | 1063 | clone_program_space (inf->pspace, vfork_parent->pspace); |
6c95b8df | 1064 | |
b73715df | 1065 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1066 | } |
1067 | ||
6c95b8df PA |
1068 | gdb_assert (current_program_space == inf->pspace); |
1069 | ||
1070 | if (non_stop && resume_parent != -1) | |
1071 | { | |
1072 | /* If the user wanted the parent to be running, let it go | |
1073 | free now. */ | |
5ed8105e | 1074 | scoped_restore_current_thread restore_thread; |
6c95b8df | 1075 | |
4100594e SM |
1076 | infrun_log_debug ("resuming vfork parent process %d", |
1077 | resume_parent); | |
6c95b8df PA |
1078 | |
1079 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1080 | } |
1081 | } | |
1082 | } | |
1083 | ||
eb6c553b | 1084 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1085 | |
1086 | static const char follow_exec_mode_new[] = "new"; | |
1087 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1088 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1089 | { |
1090 | follow_exec_mode_new, | |
1091 | follow_exec_mode_same, | |
1092 | NULL, | |
1093 | }; | |
1094 | ||
1095 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1096 | static void | |
1097 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1098 | struct cmd_list_element *c, const char *value) | |
1099 | { | |
1100 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1101 | } | |
1102 | ||
ecf45d2c | 1103 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1104 | |
c906108c | 1105 | static void |
4ca51187 | 1106 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1107 | { |
6c95b8df | 1108 | struct inferior *inf = current_inferior (); |
e99b03dc | 1109 | int pid = ptid.pid (); |
94585166 | 1110 | ptid_t process_ptid; |
7a292a7a | 1111 | |
65d2b333 PW |
1112 | /* Switch terminal for any messages produced e.g. by |
1113 | breakpoint_re_set. */ | |
1114 | target_terminal::ours_for_output (); | |
1115 | ||
c906108c SS |
1116 | /* This is an exec event that we actually wish to pay attention to. |
1117 | Refresh our symbol table to the newly exec'd program, remove any | |
1118 | momentary bp's, etc. | |
1119 | ||
1120 | If there are breakpoints, they aren't really inserted now, | |
1121 | since the exec() transformed our inferior into a fresh set | |
1122 | of instructions. | |
1123 | ||
1124 | We want to preserve symbolic breakpoints on the list, since | |
1125 | we have hopes that they can be reset after the new a.out's | |
1126 | symbol table is read. | |
1127 | ||
1128 | However, any "raw" breakpoints must be removed from the list | |
1129 | (e.g., the solib bp's), since their address is probably invalid | |
1130 | now. | |
1131 | ||
1132 | And, we DON'T want to call delete_breakpoints() here, since | |
1133 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1134 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1135 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1136 | |
1137 | mark_breakpoints_out (); | |
1138 | ||
95e50b27 PA |
1139 | /* The target reports the exec event to the main thread, even if |
1140 | some other thread does the exec, and even if the main thread was | |
1141 | stopped or already gone. We may still have non-leader threads of | |
1142 | the process on our list. E.g., on targets that don't have thread | |
1143 | exit events (like remote); or on native Linux in non-stop mode if | |
1144 | there were only two threads in the inferior and the non-leader | |
1145 | one is the one that execs (and nothing forces an update of the | |
1146 | thread list up to here). When debugging remotely, it's best to | |
1147 | avoid extra traffic, when possible, so avoid syncing the thread | |
1148 | list with the target, and instead go ahead and delete all threads | |
1149 | of the process but one that reported the event. Note this must | |
1150 | be done before calling update_breakpoints_after_exec, as | |
1151 | otherwise clearing the threads' resources would reference stale | |
1152 | thread breakpoints -- it may have been one of these threads that | |
1153 | stepped across the exec. We could just clear their stepping | |
1154 | states, but as long as we're iterating, might as well delete | |
1155 | them. Deleting them now rather than at the next user-visible | |
1156 | stop provides a nicer sequence of events for user and MI | |
1157 | notifications. */ | |
08036331 | 1158 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1159 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1160 | delete_thread (th); |
95e50b27 PA |
1161 | |
1162 | /* We also need to clear any left over stale state for the | |
1163 | leader/event thread. E.g., if there was any step-resume | |
1164 | breakpoint or similar, it's gone now. We cannot truly | |
1165 | step-to-next statement through an exec(). */ | |
08036331 | 1166 | thread_info *th = inferior_thread (); |
8358c15c | 1167 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1168 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1169 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1170 | th->control.step_range_start = 0; |
1171 | th->control.step_range_end = 0; | |
c906108c | 1172 | |
95e50b27 PA |
1173 | /* The user may have had the main thread held stopped in the |
1174 | previous image (e.g., schedlock on, or non-stop). Release | |
1175 | it now. */ | |
a75724bc PA |
1176 | th->stop_requested = 0; |
1177 | ||
95e50b27 PA |
1178 | update_breakpoints_after_exec (); |
1179 | ||
1777feb0 | 1180 | /* What is this a.out's name? */ |
f2907e49 | 1181 | process_ptid = ptid_t (pid); |
6c95b8df | 1182 | printf_unfiltered (_("%s is executing new program: %s\n"), |
a068643d | 1183 | target_pid_to_str (process_ptid).c_str (), |
ecf45d2c | 1184 | exec_file_target); |
c906108c SS |
1185 | |
1186 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1187 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1188 | |
6ca15a4b | 1189 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1190 | |
797bc1cb TT |
1191 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1192 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1193 | |
ecf45d2c SL |
1194 | /* If we were unable to map the executable target pathname onto a host |
1195 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1196 | is confusing. Maybe it would even be better to stop at this point | |
1197 | so that the user can specify a file manually before continuing. */ | |
1198 | if (exec_file_host == NULL) | |
1199 | warning (_("Could not load symbols for executable %s.\n" | |
1200 | "Do you need \"set sysroot\"?"), | |
1201 | exec_file_target); | |
c906108c | 1202 | |
cce9b6bf PA |
1203 | /* Reset the shared library package. This ensures that we get a |
1204 | shlib event when the child reaches "_start", at which point the | |
1205 | dld will have had a chance to initialize the child. */ | |
1206 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1207 | we don't want those to be satisfied by the libraries of the | |
1208 | previous incarnation of this process. */ | |
1209 | no_shared_libraries (NULL, 0); | |
1210 | ||
6c95b8df PA |
1211 | if (follow_exec_mode_string == follow_exec_mode_new) |
1212 | { | |
6c95b8df PA |
1213 | /* The user wants to keep the old inferior and program spaces |
1214 | around. Create a new fresh one, and switch to it. */ | |
1215 | ||
35ed81d4 SM |
1216 | /* Do exit processing for the original inferior before setting the new |
1217 | inferior's pid. Having two inferiors with the same pid would confuse | |
1218 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1219 | old to the new inferior. */ | |
1220 | inf = add_inferior_with_spaces (); | |
1221 | swap_terminal_info (inf, current_inferior ()); | |
057302ce | 1222 | exit_inferior_silent (current_inferior ()); |
17d8546e | 1223 | |
94585166 | 1224 | inf->pid = pid; |
ecf45d2c | 1225 | target_follow_exec (inf, exec_file_target); |
6c95b8df | 1226 | |
5b6d1e4f PA |
1227 | inferior *org_inferior = current_inferior (); |
1228 | switch_to_inferior_no_thread (inf); | |
1229 | push_target (org_inferior->process_target ()); | |
1230 | thread_info *thr = add_thread (inf->process_target (), ptid); | |
1231 | switch_to_thread (thr); | |
6c95b8df | 1232 | } |
9107fc8d PA |
1233 | else |
1234 | { | |
1235 | /* The old description may no longer be fit for the new image. | |
1236 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1237 | old description; we'll read a new one below. No need to do | |
1238 | this on "follow-exec-mode new", as the old inferior stays | |
1239 | around (its description is later cleared/refetched on | |
1240 | restart). */ | |
1241 | target_clear_description (); | |
1242 | } | |
6c95b8df PA |
1243 | |
1244 | gdb_assert (current_program_space == inf->pspace); | |
1245 | ||
ecf45d2c SL |
1246 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1247 | because the proper displacement for a PIE (Position Independent | |
1248 | Executable) main symbol file will only be computed by | |
1249 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1250 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1251 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1252 | |
9107fc8d PA |
1253 | /* If the target can specify a description, read it. Must do this |
1254 | after flipping to the new executable (because the target supplied | |
1255 | description must be compatible with the executable's | |
1256 | architecture, and the old executable may e.g., be 32-bit, while | |
1257 | the new one 64-bit), and before anything involving memory or | |
1258 | registers. */ | |
1259 | target_find_description (); | |
1260 | ||
268a4a75 | 1261 | solib_create_inferior_hook (0); |
c906108c | 1262 | |
4efc6507 DE |
1263 | jit_inferior_created_hook (); |
1264 | ||
c1e56572 JK |
1265 | breakpoint_re_set (); |
1266 | ||
c906108c SS |
1267 | /* Reinsert all breakpoints. (Those which were symbolic have |
1268 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1269 | to symbol_file_command...). */ |
c906108c SS |
1270 | insert_breakpoints (); |
1271 | ||
c0fdb45e SM |
1272 | gdb::observers::inferior_execd.notify (inf); |
1273 | ||
c906108c SS |
1274 | /* The next resume of this inferior should bring it to the shlib |
1275 | startup breakpoints. (If the user had also set bp's on | |
1276 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1277 | matically get reset there in the new process.). */ |
c906108c SS |
1278 | } |
1279 | ||
c2829269 PA |
1280 | /* The queue of threads that need to do a step-over operation to get |
1281 | past e.g., a breakpoint. What technique is used to step over the | |
1282 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1283 | same queue, to maintain rough temporal order of execution, in order | |
1284 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1285 | constantly stepping the same couple threads past their breakpoints | |
1286 | over and over, if the single-step finish fast enough. */ | |
bb88694d | 1287 | struct thread_info *global_thread_step_over_chain_head; |
c2829269 | 1288 | |
6c4cfb24 PA |
1289 | /* Bit flags indicating what the thread needs to step over. */ |
1290 | ||
8d297bbf | 1291 | enum step_over_what_flag |
6c4cfb24 PA |
1292 | { |
1293 | /* Step over a breakpoint. */ | |
1294 | STEP_OVER_BREAKPOINT = 1, | |
1295 | ||
1296 | /* Step past a non-continuable watchpoint, in order to let the | |
1297 | instruction execute so we can evaluate the watchpoint | |
1298 | expression. */ | |
1299 | STEP_OVER_WATCHPOINT = 2 | |
1300 | }; | |
8d297bbf | 1301 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1302 | |
963f9c80 | 1303 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1304 | |
1305 | struct step_over_info | |
1306 | { | |
963f9c80 PA |
1307 | /* If we're stepping past a breakpoint, this is the address space |
1308 | and address of the instruction the breakpoint is set at. We'll | |
1309 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1310 | non-NULL. */ | |
8b86c959 | 1311 | const address_space *aspace; |
31e77af2 | 1312 | CORE_ADDR address; |
963f9c80 PA |
1313 | |
1314 | /* The instruction being stepped over triggers a nonsteppable | |
1315 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1316 | int nonsteppable_watchpoint_p; | |
21edc42f YQ |
1317 | |
1318 | /* The thread's global number. */ | |
1319 | int thread; | |
31e77af2 PA |
1320 | }; |
1321 | ||
1322 | /* The step-over info of the location that is being stepped over. | |
1323 | ||
1324 | Note that with async/breakpoint always-inserted mode, a user might | |
1325 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1326 | being stepped over. As setting a new breakpoint inserts all | |
1327 | breakpoints, we need to make sure the breakpoint being stepped over | |
1328 | isn't inserted then. We do that by only clearing the step-over | |
1329 | info when the step-over is actually finished (or aborted). | |
1330 | ||
1331 | Presently GDB can only step over one breakpoint at any given time. | |
1332 | Given threads that can't run code in the same address space as the | |
1333 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1334 | to step-over at most one breakpoint per address space (so this info | |
1335 | could move to the address space object if/when GDB is extended). | |
1336 | The set of breakpoints being stepped over will normally be much | |
1337 | smaller than the set of all breakpoints, so a flag in the | |
1338 | breakpoint location structure would be wasteful. A separate list | |
1339 | also saves complexity and run-time, as otherwise we'd have to go | |
1340 | through all breakpoint locations clearing their flag whenever we | |
1341 | start a new sequence. Similar considerations weigh against storing | |
1342 | this info in the thread object. Plus, not all step overs actually | |
1343 | have breakpoint locations -- e.g., stepping past a single-step | |
1344 | breakpoint, or stepping to complete a non-continuable | |
1345 | watchpoint. */ | |
1346 | static struct step_over_info step_over_info; | |
1347 | ||
1348 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1349 | stepping over. |
1350 | N.B. We record the aspace and address now, instead of say just the thread, | |
1351 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1352 | |
1353 | static void | |
8b86c959 | 1354 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1355 | int nonsteppable_watchpoint_p, |
1356 | int thread) | |
31e77af2 PA |
1357 | { |
1358 | step_over_info.aspace = aspace; | |
1359 | step_over_info.address = address; | |
963f9c80 | 1360 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1361 | step_over_info.thread = thread; |
31e77af2 PA |
1362 | } |
1363 | ||
1364 | /* Called when we're not longer stepping over a breakpoint / an | |
1365 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1366 | ||
1367 | static void | |
1368 | clear_step_over_info (void) | |
1369 | { | |
4100594e | 1370 | infrun_log_debug ("clearing step over info"); |
31e77af2 PA |
1371 | step_over_info.aspace = NULL; |
1372 | step_over_info.address = 0; | |
963f9c80 | 1373 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1374 | step_over_info.thread = -1; |
31e77af2 PA |
1375 | } |
1376 | ||
7f89fd65 | 1377 | /* See infrun.h. */ |
31e77af2 PA |
1378 | |
1379 | int | |
1380 | stepping_past_instruction_at (struct address_space *aspace, | |
1381 | CORE_ADDR address) | |
1382 | { | |
1383 | return (step_over_info.aspace != NULL | |
1384 | && breakpoint_address_match (aspace, address, | |
1385 | step_over_info.aspace, | |
1386 | step_over_info.address)); | |
1387 | } | |
1388 | ||
963f9c80 PA |
1389 | /* See infrun.h. */ |
1390 | ||
21edc42f YQ |
1391 | int |
1392 | thread_is_stepping_over_breakpoint (int thread) | |
1393 | { | |
1394 | return (step_over_info.thread != -1 | |
1395 | && thread == step_over_info.thread); | |
1396 | } | |
1397 | ||
1398 | /* See infrun.h. */ | |
1399 | ||
963f9c80 PA |
1400 | int |
1401 | stepping_past_nonsteppable_watchpoint (void) | |
1402 | { | |
1403 | return step_over_info.nonsteppable_watchpoint_p; | |
1404 | } | |
1405 | ||
6cc83d2a PA |
1406 | /* Returns true if step-over info is valid. */ |
1407 | ||
1408 | static int | |
1409 | step_over_info_valid_p (void) | |
1410 | { | |
963f9c80 PA |
1411 | return (step_over_info.aspace != NULL |
1412 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1413 | } |
1414 | ||
c906108c | 1415 | \f |
237fc4c9 PA |
1416 | /* Displaced stepping. */ |
1417 | ||
1418 | /* In non-stop debugging mode, we must take special care to manage | |
1419 | breakpoints properly; in particular, the traditional strategy for | |
1420 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1421 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1422 | breakpoint it has hit while ensuring that other threads running | |
1423 | concurrently will hit the breakpoint as they should. | |
1424 | ||
1425 | The traditional way to step a thread T off a breakpoint in a | |
1426 | multi-threaded program in all-stop mode is as follows: | |
1427 | ||
1428 | a0) Initially, all threads are stopped, and breakpoints are not | |
1429 | inserted. | |
1430 | a1) We single-step T, leaving breakpoints uninserted. | |
1431 | a2) We insert breakpoints, and resume all threads. | |
1432 | ||
1433 | In non-stop debugging, however, this strategy is unsuitable: we | |
1434 | don't want to have to stop all threads in the system in order to | |
1435 | continue or step T past a breakpoint. Instead, we use displaced | |
1436 | stepping: | |
1437 | ||
1438 | n0) Initially, T is stopped, other threads are running, and | |
1439 | breakpoints are inserted. | |
1440 | n1) We copy the instruction "under" the breakpoint to a separate | |
1441 | location, outside the main code stream, making any adjustments | |
1442 | to the instruction, register, and memory state as directed by | |
1443 | T's architecture. | |
1444 | n2) We single-step T over the instruction at its new location. | |
1445 | n3) We adjust the resulting register and memory state as directed | |
1446 | by T's architecture. This includes resetting T's PC to point | |
1447 | back into the main instruction stream. | |
1448 | n4) We resume T. | |
1449 | ||
1450 | This approach depends on the following gdbarch methods: | |
1451 | ||
1452 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1453 | indicate where to copy the instruction, and how much space must | |
1454 | be reserved there. We use these in step n1. | |
1455 | ||
1456 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1457 | address, and makes any necessary adjustments to the instruction, | |
1458 | register contents, and memory. We use this in step n1. | |
1459 | ||
1460 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1461 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1462 | same effect the instruction would have had if we had executed it |
1463 | at its original address. We use this in step n3. | |
1464 | ||
237fc4c9 PA |
1465 | The gdbarch_displaced_step_copy_insn and |
1466 | gdbarch_displaced_step_fixup functions must be written so that | |
1467 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1468 | single-stepping across the copied instruction, and then applying | |
1469 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1470 | thread's memory and registers as stepping the instruction in place | |
1471 | would have. Exactly which responsibilities fall to the copy and | |
1472 | which fall to the fixup is up to the author of those functions. | |
1473 | ||
1474 | See the comments in gdbarch.sh for details. | |
1475 | ||
1476 | Note that displaced stepping and software single-step cannot | |
1477 | currently be used in combination, although with some care I think | |
1478 | they could be made to. Software single-step works by placing | |
1479 | breakpoints on all possible subsequent instructions; if the | |
1480 | displaced instruction is a PC-relative jump, those breakpoints | |
1481 | could fall in very strange places --- on pages that aren't | |
1482 | executable, or at addresses that are not proper instruction | |
1483 | boundaries. (We do generally let other threads run while we wait | |
1484 | to hit the software single-step breakpoint, and they might | |
1485 | encounter such a corrupted instruction.) One way to work around | |
1486 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1487 | simulate the effect of PC-relative instructions (and return NULL) | |
1488 | on architectures that use software single-stepping. | |
1489 | ||
1490 | In non-stop mode, we can have independent and simultaneous step | |
1491 | requests, so more than one thread may need to simultaneously step | |
1492 | over a breakpoint. The current implementation assumes there is | |
1493 | only one scratch space per process. In this case, we have to | |
1494 | serialize access to the scratch space. If thread A wants to step | |
1495 | over a breakpoint, but we are currently waiting for some other | |
1496 | thread to complete a displaced step, we leave thread A stopped and | |
1497 | place it in the displaced_step_request_queue. Whenever a displaced | |
1498 | step finishes, we pick the next thread in the queue and start a new | |
1499 | displaced step operation on it. See displaced_step_prepare and | |
1500 | displaced_step_fixup for details. */ | |
1501 | ||
e088209c | 1502 | /* Get the displaced stepping state of inferior INF. */ |
fc1cf338 | 1503 | |
39a36629 | 1504 | static displaced_step_inferior_state * |
00431a78 | 1505 | get_displaced_stepping_state (inferior *inf) |
fc1cf338 | 1506 | { |
d20172fc | 1507 | return &inf->displaced_step_state; |
fc1cf338 PA |
1508 | } |
1509 | ||
e088209c | 1510 | /* Get the displaced stepping state of thread THREAD. */ |
372316f1 | 1511 | |
e088209c SM |
1512 | static displaced_step_thread_state * |
1513 | get_displaced_stepping_state (thread_info *thread) | |
372316f1 | 1514 | { |
e088209c | 1515 | return &thread->displaced_step_state; |
372316f1 PA |
1516 | } |
1517 | ||
e088209c | 1518 | /* Return true if the given thread is doing a displaced step. */ |
c0987663 | 1519 | |
e088209c SM |
1520 | static bool |
1521 | displaced_step_in_progress (thread_info *thread) | |
c0987663 | 1522 | { |
00431a78 | 1523 | gdb_assert (thread != NULL); |
c0987663 | 1524 | |
e088209c | 1525 | return get_displaced_stepping_state (thread)->in_progress (); |
c0987663 YQ |
1526 | } |
1527 | ||
e088209c | 1528 | /* Return true if any thread of this inferior is doing a displaced step. */ |
8f572e5c | 1529 | |
e088209c | 1530 | static bool |
00431a78 | 1531 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1532 | { |
e088209c SM |
1533 | for (thread_info *thread : inf->non_exited_threads ()) |
1534 | { | |
1535 | if (displaced_step_in_progress (thread)) | |
1536 | return true; | |
1537 | } | |
1538 | ||
1539 | return false; | |
1540 | } | |
1541 | ||
1542 | /* Return true if any thread is doing a displaced step. */ | |
1543 | ||
1544 | static bool | |
1545 | displaced_step_in_progress_any_thread () | |
1546 | { | |
1547 | for (thread_info *thread : all_non_exited_threads ()) | |
1548 | { | |
1549 | if (displaced_step_in_progress (thread)) | |
1550 | return true; | |
1551 | } | |
1552 | ||
1553 | return false; | |
fc1cf338 PA |
1554 | } |
1555 | ||
a42244db | 1556 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
588de28a | 1557 | of copy area, return corresponding displaced_step_copy_insn_closure. Otherwise, |
a42244db YQ |
1558 | return NULL. */ |
1559 | ||
588de28a SM |
1560 | struct displaced_step_copy_insn_closure * |
1561 | get_displaced_step_copy_insn_closure_by_addr (CORE_ADDR addr) | |
a42244db | 1562 | { |
e088209c SM |
1563 | // FIXME: implement me (only needed on ARM). |
1564 | // displaced_step_inferior_state *displaced | |
1565 | // = get_displaced_stepping_state (current_inferior ()); | |
1566 | // | |
1567 | // /* If checking the mode of displaced instruction in copy area. */ | |
1568 | // if (displaced->step_thread != nullptr | |
1569 | // && displaced->step_copy == addr) | |
1570 | // return displaced->step_closure.get (); | |
1571 | // | |
a42244db YQ |
1572 | return NULL; |
1573 | } | |
1574 | ||
fc1cf338 PA |
1575 | static void |
1576 | infrun_inferior_exit (struct inferior *inf) | |
1577 | { | |
d20172fc | 1578 | inf->displaced_step_state.reset (); |
fc1cf338 | 1579 | } |
237fc4c9 | 1580 | |
fff08868 HZ |
1581 | /* If ON, and the architecture supports it, GDB will use displaced |
1582 | stepping to step over breakpoints. If OFF, or if the architecture | |
1583 | doesn't support it, GDB will instead use the traditional | |
1584 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1585 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1586 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1587 | |
72d0e2c5 | 1588 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1589 | |
237fc4c9 PA |
1590 | static void |
1591 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1592 | struct cmd_list_element *c, | |
1593 | const char *value) | |
1594 | { | |
72d0e2c5 | 1595 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1596 | fprintf_filtered (file, |
1597 | _("Debugger's willingness to use displaced stepping " | |
1598 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1599 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1600 | else |
3e43a32a MS |
1601 | fprintf_filtered (file, |
1602 | _("Debugger's willingness to use displaced stepping " | |
1603 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1604 | } |
1605 | ||
9822cb57 SM |
1606 | /* Return true if the gdbarch implements the required methods to use |
1607 | displaced stepping. */ | |
1608 | ||
1609 | static bool | |
1610 | gdbarch_supports_displaced_stepping (gdbarch *arch) | |
1611 | { | |
5514706f SM |
1612 | /* Only check for the presence of `prepare`. `finish` is required by the |
1613 | gdbarch verification to be provided if `prepare` is provided. */ | |
1614 | return gdbarch_displaced_step_prepare_p (arch); | |
9822cb57 SM |
1615 | } |
1616 | ||
fff08868 | 1617 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1618 | over breakpoints of thread TP. */ |
fff08868 | 1619 | |
9822cb57 SM |
1620 | static bool |
1621 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1622 | { |
9822cb57 SM |
1623 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1624 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1625 | return false; | |
1626 | ||
1627 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1628 | way. */ | |
1629 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1630 | && !target_is_non_stop_p ()) | |
1631 | return false; | |
1632 | ||
1633 | gdbarch *gdbarch = get_thread_regcache (tp)->arch (); | |
1634 | ||
1635 | /* If the architecture doesn't implement displaced stepping, don't use | |
1636 | it. */ | |
1637 | if (!gdbarch_supports_displaced_stepping (gdbarch)) | |
1638 | return false; | |
1639 | ||
1640 | /* If recording, don't use displaced stepping. */ | |
1641 | if (find_record_target () != nullptr) | |
1642 | return false; | |
1643 | ||
d20172fc SM |
1644 | displaced_step_inferior_state *displaced_state |
1645 | = get_displaced_stepping_state (tp->inf); | |
3fc8eb30 | 1646 | |
9822cb57 SM |
1647 | /* If displaced stepping failed before for this inferior, don't bother trying |
1648 | again. */ | |
1649 | if (displaced_state->failed_before) | |
1650 | return false; | |
1651 | ||
1652 | return true; | |
237fc4c9 PA |
1653 | } |
1654 | ||
e088209c | 1655 | /* Simple function wrapper around displaced_step_thread_state::reset. */ |
d8d83535 | 1656 | |
237fc4c9 | 1657 | static void |
e088209c | 1658 | displaced_step_reset (displaced_step_thread_state *displaced) |
237fc4c9 | 1659 | { |
d8d83535 | 1660 | displaced->reset (); |
237fc4c9 PA |
1661 | } |
1662 | ||
d8d83535 SM |
1663 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1664 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1665 | ||
1666 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 PA |
1667 | |
1668 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1669 | void | |
1670 | displaced_step_dump_bytes (struct ui_file *file, | |
1671 | const gdb_byte *buf, | |
1672 | size_t len) | |
1673 | { | |
1674 | int i; | |
1675 | ||
1676 | for (i = 0; i < len; i++) | |
1677 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1678 | fputs_unfiltered ("\n", file); | |
1679 | } | |
1680 | ||
1681 | /* Prepare to single-step, using displaced stepping. | |
1682 | ||
1683 | Note that we cannot use displaced stepping when we have a signal to | |
1684 | deliver. If we have a signal to deliver and an instruction to step | |
1685 | over, then after the step, there will be no indication from the | |
1686 | target whether the thread entered a signal handler or ignored the | |
1687 | signal and stepped over the instruction successfully --- both cases | |
1688 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1689 | fixup, and in the second case we must --- but we can't tell which. | |
1690 | Comments in the code for 'random signals' in handle_inferior_event | |
1691 | explain how we handle this case instead. | |
1692 | ||
1693 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1694 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1695 | if this instruction can't be displaced stepped. */ | |
1696 | ||
e088209c | 1697 | static displaced_step_prepare_status |
00431a78 | 1698 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1699 | { |
00431a78 | 1700 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1701 | struct gdbarch *gdbarch = regcache->arch (); |
e088209c SM |
1702 | displaced_step_thread_state *thread_disp_step_state |
1703 | = get_displaced_stepping_state (tp); | |
237fc4c9 PA |
1704 | |
1705 | /* We should never reach this function if the architecture does not | |
1706 | support displaced stepping. */ | |
9822cb57 | 1707 | gdb_assert (gdbarch_supports_displaced_stepping (gdbarch)); |
237fc4c9 | 1708 | |
c2829269 PA |
1709 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1710 | gdb_assert (tp->control.trap_expected); | |
1711 | ||
c1e36e3e PA |
1712 | /* Disable range stepping while executing in the scratch pad. We |
1713 | want a single-step even if executing the displaced instruction in | |
1714 | the scratch buffer lands within the stepping range (e.g., a | |
1715 | jump/branch). */ | |
1716 | tp->control.may_range_step = 0; | |
1717 | ||
e088209c SM |
1718 | /* We are about to start a displaced step for this thread, if one is already |
1719 | in progress, we goofed up somewhere. */ | |
1720 | gdb_assert (!thread_disp_step_state->in_progress ()); | |
237fc4c9 | 1721 | |
e088209c | 1722 | scoped_restore_current_thread restore_thread; |
fc1cf338 | 1723 | |
e088209c SM |
1724 | switch_to_thread (tp); |
1725 | ||
1726 | CORE_ADDR original_pc = regcache_read_pc (regcache); | |
237fc4c9 | 1727 | |
e088209c | 1728 | displaced_step_prepare_status status = |
348a832d | 1729 | tp->inf->top_target ()->displaced_step_prepare (tp); |
e088209c SM |
1730 | |
1731 | if (status == DISPLACED_STEP_PREPARE_STATUS_ERROR) | |
1732 | { | |
237fc4c9 PA |
1733 | if (debug_displaced) |
1734 | fprintf_unfiltered (gdb_stdlog, | |
e088209c | 1735 | "displaced: failed to prepare (%s)", |
a068643d | 1736 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 | 1737 | |
e088209c | 1738 | return DISPLACED_STEP_PREPARE_STATUS_ERROR; |
237fc4c9 | 1739 | } |
e088209c | 1740 | else if (status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
237fc4c9 | 1741 | { |
e088209c SM |
1742 | /* Not enough displaced stepping resources available, defer this |
1743 | request by placing it the queue. */ | |
1744 | ||
237fc4c9 PA |
1745 | if (debug_displaced) |
1746 | fprintf_unfiltered (gdb_stdlog, | |
e088209c SM |
1747 | "displaced: not enough resources available, " |
1748 | "deferring step of %s\n", | |
a068643d | 1749 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 | 1750 | |
e088209c | 1751 | global_thread_step_over_chain_enqueue (tp); |
d6864985 | 1752 | tp->inf->displaced_step_state.unavailable = true; |
d35ae833 | 1753 | |
e088209c | 1754 | return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE; |
d35ae833 PA |
1755 | } |
1756 | ||
e088209c SM |
1757 | gdb_assert (status == DISPLACED_STEP_PREPARE_STATUS_OK); |
1758 | ||
1759 | // FIXME: Should probably replicated in the arch implementation now. | |
1760 | // | |
1761 | // if (breakpoint_in_range_p (aspace, copy, len)) | |
1762 | // { | |
1763 | // /* There's a breakpoint set in the scratch pad location range | |
1764 | // (which is usually around the entry point). We'd either | |
1765 | // install it before resuming, which would overwrite/corrupt the | |
1766 | // scratch pad, or if it was already inserted, this displaced | |
1767 | // step would overwrite it. The latter is OK in the sense that | |
1768 | // we already assume that no thread is going to execute the code | |
1769 | // in the scratch pad range (after initial startup) anyway, but | |
1770 | // the former is unacceptable. Simply punt and fallback to | |
1771 | // stepping over this breakpoint in-line. */ | |
1772 | // if (debug_displaced) | |
1773 | // { | |
1774 | // fprintf_unfiltered (gdb_stdlog, | |
1775 | // "displaced: breakpoint set in scratch pad. " | |
1776 | // "Stepping over breakpoint in-line instead.\n"); | |
1777 | // } | |
1778 | // | |
1779 | // gdb_assert (false); | |
1780 | // gdbarch_displaced_step_release_location (gdbarch, copy); | |
1781 | // | |
1782 | // return -1; | |
1783 | // } | |
237fc4c9 | 1784 | |
9f5a595d UW |
1785 | /* Save the information we need to fix things up if the step |
1786 | succeeds. */ | |
e088209c | 1787 | thread_disp_step_state->set (gdbarch); |
237fc4c9 | 1788 | |
e088209c SM |
1789 | // FIXME: get it from _prepare? |
1790 | CORE_ADDR displaced_pc = 0; | |
ad53cd71 | 1791 | |
237fc4c9 | 1792 | if (debug_displaced) |
e088209c SM |
1793 | fprintf_unfiltered (gdb_stdlog, |
1794 | "displaced: prepared successfully thread=%s, " | |
1795 | "original_pc=%s, displaced_pc=%s\n", | |
1796 | target_pid_to_str (tp->ptid).c_str (), | |
1797 | paddress (gdbarch, original_pc), | |
1798 | paddress (gdbarch, displaced_pc)); | |
1799 | ||
1800 | return DISPLACED_STEP_PREPARE_STATUS_OK; | |
237fc4c9 PA |
1801 | } |
1802 | ||
3fc8eb30 PA |
1803 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1804 | attempts at displaced stepping if we get a memory error. */ | |
1805 | ||
e088209c | 1806 | static displaced_step_prepare_status |
00431a78 | 1807 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 | 1808 | { |
e088209c SM |
1809 | displaced_step_prepare_status status |
1810 | = DISPLACED_STEP_PREPARE_STATUS_ERROR; | |
3fc8eb30 | 1811 | |
a70b8144 | 1812 | try |
3fc8eb30 | 1813 | { |
e088209c | 1814 | status = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1815 | } |
230d2906 | 1816 | catch (const gdb_exception_error &ex) |
3fc8eb30 PA |
1817 | { |
1818 | struct displaced_step_inferior_state *displaced_state; | |
1819 | ||
16b41842 PA |
1820 | if (ex.error != MEMORY_ERROR |
1821 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1822 | throw; |
3fc8eb30 | 1823 | |
4100594e SM |
1824 | infrun_log_debug ("caught exception, disabling displaced stepping: %s", |
1825 | ex.what ()); | |
3fc8eb30 PA |
1826 | |
1827 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1828 | "auto". */ | |
1829 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1830 | { | |
fd7dcb94 | 1831 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1832 | ex.what ()); |
3fc8eb30 PA |
1833 | } |
1834 | ||
1835 | /* Disable further displaced stepping attempts. */ | |
1836 | displaced_state | |
00431a78 | 1837 | = get_displaced_stepping_state (thread->inf); |
3fc8eb30 PA |
1838 | displaced_state->failed_before = 1; |
1839 | } | |
3fc8eb30 | 1840 | |
e088209c | 1841 | return status; |
e2d96639 YQ |
1842 | } |
1843 | ||
372316f1 PA |
1844 | /* If we displaced stepped an instruction successfully, adjust |
1845 | registers and memory to yield the same effect the instruction would | |
1846 | have had if we had executed it at its original address, and return | |
1847 | 1. If the instruction didn't complete, relocate the PC and return | |
1848 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1849 | ||
1850 | static int | |
e088209c | 1851 | displaced_step_finish (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1852 | { |
e088209c SM |
1853 | displaced_step_thread_state *displaced |
1854 | = get_displaced_stepping_state (event_thread); | |
fc1cf338 | 1855 | |
e088209c SM |
1856 | /* Was this thread performing a displaced step? */ |
1857 | if (!displaced->in_progress ()) | |
372316f1 | 1858 | return 0; |
237fc4c9 | 1859 | |
e088209c SM |
1860 | displaced_step_reset_cleanup cleanup (displaced); |
1861 | ||
cb71640d PA |
1862 | /* Fixup may need to read memory/registers. Switch to the thread |
1863 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
d43b7a2d TBA |
1864 | the current thread, and displaced_step_restore performs ptid-dependent |
1865 | memory accesses using current_inferior() and current_top_target(). */ | |
00431a78 | 1866 | switch_to_thread (event_thread); |
cb71640d | 1867 | |
e088209c SM |
1868 | /* Do the fixup, and release the resources acquired to do the displaced |
1869 | step. */ | |
1870 | displaced_step_finish_status finish_status = | |
348a832d SM |
1871 | event_thread->inf->top_target ()->displaced_step_finish (event_thread, |
1872 | signal); | |
d43b7a2d | 1873 | |
e088209c SM |
1874 | if (finish_status == DISPLACED_STEP_FINISH_STATUS_OK) |
1875 | return 1; | |
237fc4c9 | 1876 | else |
e088209c | 1877 | return -1; |
c2829269 | 1878 | } |
1c5cfe86 | 1879 | |
4d9d9d04 PA |
1880 | /* Data to be passed around while handling an event. This data is |
1881 | discarded between events. */ | |
1882 | struct execution_control_state | |
1883 | { | |
5b6d1e4f | 1884 | process_stratum_target *target; |
4d9d9d04 PA |
1885 | ptid_t ptid; |
1886 | /* The thread that got the event, if this was a thread event; NULL | |
1887 | otherwise. */ | |
1888 | struct thread_info *event_thread; | |
1889 | ||
1890 | struct target_waitstatus ws; | |
1891 | int stop_func_filled_in; | |
1892 | CORE_ADDR stop_func_start; | |
1893 | CORE_ADDR stop_func_end; | |
1894 | const char *stop_func_name; | |
1895 | int wait_some_more; | |
1896 | ||
1897 | /* True if the event thread hit the single-step breakpoint of | |
1898 | another thread. Thus the event doesn't cause a stop, the thread | |
1899 | needs to be single-stepped past the single-step breakpoint before | |
1900 | we can switch back to the original stepping thread. */ | |
1901 | int hit_singlestep_breakpoint; | |
1902 | }; | |
1903 | ||
1904 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1905 | |
1906 | static void | |
4d9d9d04 PA |
1907 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1908 | { | |
1909 | memset (ecs, 0, sizeof (*ecs)); | |
1910 | ecs->event_thread = tp; | |
1911 | ecs->ptid = tp->ptid; | |
1912 | } | |
1913 | ||
1914 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1915 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 1916 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1917 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1918 | |
1919 | /* Are there any pending step-over requests? If so, run all we can | |
1920 | now and return true. Otherwise, return false. */ | |
1921 | ||
1922 | static int | |
c2829269 PA |
1923 | start_step_over (void) |
1924 | { | |
1925 | struct thread_info *tp, *next; | |
e088209c | 1926 | int started = 0; |
c2829269 | 1927 | |
372316f1 PA |
1928 | /* Don't start a new step-over if we already have an in-line |
1929 | step-over operation ongoing. */ | |
1930 | if (step_over_info_valid_p ()) | |
e088209c SM |
1931 | return started; |
1932 | ||
1933 | /* Steal the global thread step over chain. */ | |
1934 | thread_info *threads_to_step = global_thread_step_over_chain_head; | |
1935 | global_thread_step_over_chain_head = NULL; | |
1936 | ||
1937 | if (debug_infrun) | |
1938 | fprintf_unfiltered (gdb_stdlog, | |
1939 | "infrun: stealing list of %d threads to step from global queue\n", | |
1940 | thread_step_over_chain_length (threads_to_step)); | |
372316f1 | 1941 | |
d6864985 SM |
1942 | for (inferior *inf : all_inferiors ()) |
1943 | inf->displaced_step_state.unavailable = false; | |
1944 | ||
e088209c | 1945 | for (tp = threads_to_step; tp != NULL; tp = next) |
237fc4c9 | 1946 | { |
4d9d9d04 PA |
1947 | struct execution_control_state ecss; |
1948 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1949 | step_over_what step_what; |
372316f1 | 1950 | int must_be_in_line; |
c2829269 | 1951 | |
c65d6b55 PA |
1952 | gdb_assert (!tp->stop_requested); |
1953 | ||
e088209c | 1954 | next = thread_step_over_chain_next (threads_to_step, tp); |
c2829269 | 1955 | |
372316f1 PA |
1956 | step_what = thread_still_needs_step_over (tp); |
1957 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1958 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1959 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1960 | |
1961 | /* We currently stop all threads of all processes to step-over | |
1962 | in-line. If we need to start a new in-line step-over, let | |
1963 | any pending displaced steps finish first. */ | |
e088209c SM |
1964 | if (must_be_in_line && displaced_step_in_progress_any_thread ()) |
1965 | continue; | |
c2829269 | 1966 | |
e088209c | 1967 | thread_step_over_chain_remove (&threads_to_step, tp); |
c2829269 | 1968 | |
372316f1 PA |
1969 | if (tp->control.trap_expected |
1970 | || tp->resumed | |
1971 | || tp->executing) | |
ad53cd71 | 1972 | { |
4d9d9d04 PA |
1973 | internal_error (__FILE__, __LINE__, |
1974 | "[%s] has inconsistent state: " | |
372316f1 | 1975 | "trap_expected=%d, resumed=%d, executing=%d\n", |
a068643d | 1976 | target_pid_to_str (tp->ptid).c_str (), |
4d9d9d04 | 1977 | tp->control.trap_expected, |
372316f1 | 1978 | tp->resumed, |
4d9d9d04 | 1979 | tp->executing); |
ad53cd71 | 1980 | } |
1c5cfe86 | 1981 | |
4100594e SM |
1982 | infrun_log_debug ("resuming [%s] for step-over", |
1983 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 PA |
1984 | |
1985 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
1986 | is no longer inserted. In all-stop, we want to keep looking | |
1987 | for a thread that needs a step-over instead of resuming TP, | |
1988 | because we wouldn't be able to resume anything else until the | |
1989 | target stops again. In non-stop, the resume always resumes | |
1990 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 1991 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 1992 | continue; |
8550d3b3 | 1993 | |
d6864985 SM |
1994 | if (tp->inf->displaced_step_state.unavailable) |
1995 | { | |
1996 | global_thread_step_over_chain_enqueue (tp); | |
1997 | continue; | |
1998 | } | |
1999 | ||
00431a78 | 2000 | switch_to_thread (tp); |
4d9d9d04 PA |
2001 | reset_ecs (ecs, tp); |
2002 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2003 | |
4d9d9d04 PA |
2004 | if (!ecs->wait_some_more) |
2005 | error (_("Command aborted.")); | |
1c5cfe86 | 2006 | |
e088209c SM |
2007 | /* If the thread's step over could not be initiated, it was re-added |
2008 | to the global step over chain. */ | |
2009 | if (tp->resumed) | |
2010 | { | |
2011 | infrun_log_debug ("start_step_over: [%s] was resumed.\n", | |
2012 | target_pid_to_str (tp->ptid).c_str ()); | |
2013 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
2014 | } | |
2015 | else | |
2016 | { | |
2017 | infrun_log_debug ("infrun: start_step_over: [%s] was NOT resumed.\n", | |
2018 | target_pid_to_str (tp->ptid).c_str ()); | |
2019 | gdb_assert (thread_is_in_step_over_chain (tp)); | |
2020 | ||
2021 | } | |
372316f1 PA |
2022 | |
2023 | /* If we started a new in-line step-over, we're done. */ | |
2024 | if (step_over_info_valid_p ()) | |
2025 | { | |
2026 | gdb_assert (tp->control.trap_expected); | |
e088209c SM |
2027 | started = 1; |
2028 | break; | |
372316f1 PA |
2029 | } |
2030 | ||
fbea99ea | 2031 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2032 | { |
2033 | /* On all-stop, shouldn't have resumed unless we needed a | |
2034 | step over. */ | |
2035 | gdb_assert (tp->control.trap_expected | |
2036 | || tp->step_after_step_resume_breakpoint); | |
2037 | ||
2038 | /* With remote targets (at least), in all-stop, we can't | |
2039 | issue any further remote commands until the program stops | |
2040 | again. */ | |
e088209c SM |
2041 | started = 1; |
2042 | break; | |
1c5cfe86 | 2043 | } |
c2829269 | 2044 | |
4d9d9d04 PA |
2045 | /* Either the thread no longer needed a step-over, or a new |
2046 | displaced stepping sequence started. Even in the latter | |
2047 | case, continue looking. Maybe we can also start another | |
2048 | displaced step on a thread of other process. */ | |
237fc4c9 | 2049 | } |
4d9d9d04 | 2050 | |
e088209c SM |
2051 | /* If there are threads left in the THREADS_TO_STEP list, but we have |
2052 | detected that we can't start anything more, put back these threads | |
2053 | in the global list. */ | |
2054 | if (threads_to_step == NULL) | |
2055 | { | |
2056 | if (debug_infrun) | |
2057 | fprintf_unfiltered (gdb_stdlog, | |
2058 | "infrun: step-over queue now empty\n"); | |
2059 | } | |
2060 | else | |
2061 | { | |
2062 | if (debug_infrun) | |
2063 | fprintf_unfiltered (gdb_stdlog, | |
2064 | "infrun: putting back %d threads to step in global queue\n", | |
2065 | thread_step_over_chain_length (threads_to_step)); | |
2066 | while (threads_to_step != nullptr) | |
2067 | { | |
2068 | thread_info *thread = threads_to_step; | |
2069 | ||
2070 | /* Remove from that list. */ | |
2071 | thread_step_over_chain_remove (&threads_to_step, thread); | |
2072 | ||
2073 | /* Add to global list. */ | |
2074 | global_thread_step_over_chain_enqueue (thread); | |
2075 | ||
2076 | } | |
2077 | } | |
2078 | ||
2079 | return started; | |
237fc4c9 PA |
2080 | } |
2081 | ||
5231c1fd PA |
2082 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2083 | holding OLD_PTID. */ | |
2084 | static void | |
2085 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2086 | { | |
d7e15655 | 2087 | if (inferior_ptid == old_ptid) |
5231c1fd | 2088 | inferior_ptid = new_ptid; |
5231c1fd PA |
2089 | } |
2090 | ||
237fc4c9 | 2091 | \f |
c906108c | 2092 | |
53904c9e AC |
2093 | static const char schedlock_off[] = "off"; |
2094 | static const char schedlock_on[] = "on"; | |
2095 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2096 | static const char schedlock_replay[] = "replay"; |
40478521 | 2097 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2098 | schedlock_off, |
2099 | schedlock_on, | |
2100 | schedlock_step, | |
f2665db5 | 2101 | schedlock_replay, |
ef346e04 AC |
2102 | NULL |
2103 | }; | |
f2665db5 | 2104 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2105 | static void |
2106 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2107 | struct cmd_list_element *c, const char *value) | |
2108 | { | |
3e43a32a MS |
2109 | fprintf_filtered (file, |
2110 | _("Mode for locking scheduler " | |
2111 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2112 | value); |
2113 | } | |
c906108c SS |
2114 | |
2115 | static void | |
eb4c3f4a | 2116 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2117 | { |
eefe576e AC |
2118 | if (!target_can_lock_scheduler) |
2119 | { | |
2120 | scheduler_mode = schedlock_off; | |
2121 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2122 | } | |
c906108c SS |
2123 | } |
2124 | ||
d4db2f36 PA |
2125 | /* True if execution commands resume all threads of all processes by |
2126 | default; otherwise, resume only threads of the current inferior | |
2127 | process. */ | |
491144b5 | 2128 | bool sched_multi = false; |
d4db2f36 | 2129 | |
2facfe5c DD |
2130 | /* Try to setup for software single stepping over the specified location. |
2131 | Return 1 if target_resume() should use hardware single step. | |
2132 | ||
2133 | GDBARCH the current gdbarch. | |
2134 | PC the location to step over. */ | |
2135 | ||
2136 | static int | |
2137 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2138 | { | |
2139 | int hw_step = 1; | |
2140 | ||
f02253f1 | 2141 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2142 | && gdbarch_software_single_step_p (gdbarch)) |
2143 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2144 | ||
2facfe5c DD |
2145 | return hw_step; |
2146 | } | |
c906108c | 2147 | |
f3263aa4 PA |
2148 | /* See infrun.h. */ |
2149 | ||
09cee04b PA |
2150 | ptid_t |
2151 | user_visible_resume_ptid (int step) | |
2152 | { | |
f3263aa4 | 2153 | ptid_t resume_ptid; |
09cee04b | 2154 | |
09cee04b PA |
2155 | if (non_stop) |
2156 | { | |
2157 | /* With non-stop mode on, threads are always handled | |
2158 | individually. */ | |
2159 | resume_ptid = inferior_ptid; | |
2160 | } | |
2161 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2162 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2163 | { |
f3263aa4 PA |
2164 | /* User-settable 'scheduler' mode requires solo thread |
2165 | resume. */ | |
09cee04b PA |
2166 | resume_ptid = inferior_ptid; |
2167 | } | |
f2665db5 MM |
2168 | else if ((scheduler_mode == schedlock_replay) |
2169 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2170 | { | |
2171 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2172 | mode. */ | |
2173 | resume_ptid = inferior_ptid; | |
2174 | } | |
f3263aa4 PA |
2175 | else if (!sched_multi && target_supports_multi_process ()) |
2176 | { | |
2177 | /* Resume all threads of the current process (and none of other | |
2178 | processes). */ | |
e99b03dc | 2179 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2180 | } |
2181 | else | |
2182 | { | |
2183 | /* Resume all threads of all processes. */ | |
2184 | resume_ptid = RESUME_ALL; | |
2185 | } | |
09cee04b PA |
2186 | |
2187 | return resume_ptid; | |
2188 | } | |
2189 | ||
5b6d1e4f PA |
2190 | /* See infrun.h. */ |
2191 | ||
2192 | process_stratum_target * | |
2193 | user_visible_resume_target (ptid_t resume_ptid) | |
2194 | { | |
2195 | return (resume_ptid == minus_one_ptid && sched_multi | |
2196 | ? NULL | |
2197 | : current_inferior ()->process_target ()); | |
2198 | } | |
2199 | ||
fbea99ea PA |
2200 | /* Return a ptid representing the set of threads that we will resume, |
2201 | in the perspective of the target, assuming run control handling | |
2202 | does not require leaving some threads stopped (e.g., stepping past | |
2203 | breakpoint). USER_STEP indicates whether we're about to start the | |
2204 | target for a stepping command. */ | |
2205 | ||
2206 | static ptid_t | |
2207 | internal_resume_ptid (int user_step) | |
2208 | { | |
2209 | /* In non-stop, we always control threads individually. Note that | |
2210 | the target may always work in non-stop mode even with "set | |
2211 | non-stop off", in which case user_visible_resume_ptid could | |
2212 | return a wildcard ptid. */ | |
2213 | if (target_is_non_stop_p ()) | |
2214 | return inferior_ptid; | |
2215 | else | |
2216 | return user_visible_resume_ptid (user_step); | |
2217 | } | |
2218 | ||
64ce06e4 PA |
2219 | /* Wrapper for target_resume, that handles infrun-specific |
2220 | bookkeeping. */ | |
2221 | ||
2222 | static void | |
2223 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2224 | { | |
2225 | struct thread_info *tp = inferior_thread (); | |
2226 | ||
c65d6b55 PA |
2227 | gdb_assert (!tp->stop_requested); |
2228 | ||
64ce06e4 | 2229 | /* Install inferior's terminal modes. */ |
223ffa71 | 2230 | target_terminal::inferior (); |
64ce06e4 PA |
2231 | |
2232 | /* Avoid confusing the next resume, if the next stop/resume | |
2233 | happens to apply to another thread. */ | |
2234 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2235 | ||
8f572e5c PA |
2236 | /* Advise target which signals may be handled silently. |
2237 | ||
2238 | If we have removed breakpoints because we are stepping over one | |
2239 | in-line (in any thread), we need to receive all signals to avoid | |
2240 | accidentally skipping a breakpoint during execution of a signal | |
2241 | handler. | |
2242 | ||
2243 | Likewise if we're displaced stepping, otherwise a trap for a | |
2244 | breakpoint in a signal handler might be confused with the | |
2245 | displaced step finishing. We don't make the displaced_step_fixup | |
2246 | step distinguish the cases instead, because: | |
2247 | ||
2248 | - a backtrace while stopped in the signal handler would show the | |
2249 | scratch pad as frame older than the signal handler, instead of | |
2250 | the real mainline code. | |
2251 | ||
2252 | - when the thread is later resumed, the signal handler would | |
2253 | return to the scratch pad area, which would no longer be | |
2254 | valid. */ | |
2255 | if (step_over_info_valid_p () | |
00431a78 | 2256 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2257 | target_pass_signals ({}); |
64ce06e4 | 2258 | else |
adc6a863 | 2259 | target_pass_signals (signal_pass); |
64ce06e4 PA |
2260 | |
2261 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2262 | |
2263 | target_commit_resume (); | |
5b6d1e4f PA |
2264 | |
2265 | if (target_can_async_p ()) | |
2266 | target_async (1); | |
64ce06e4 PA |
2267 | } |
2268 | ||
d930703d | 2269 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2270 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2271 | call 'resume', which handles exceptions. */ | |
c906108c | 2272 | |
71d378ae PA |
2273 | static void |
2274 | resume_1 (enum gdb_signal sig) | |
c906108c | 2275 | { |
515630c5 | 2276 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2277 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2278 | struct thread_info *tp = inferior_thread (); |
8b86c959 | 2279 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2280 | ptid_t resume_ptid; |
856e7dd6 PA |
2281 | /* This represents the user's step vs continue request. When |
2282 | deciding whether "set scheduler-locking step" applies, it's the | |
2283 | user's intention that counts. */ | |
2284 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2285 | /* This represents what we'll actually request the target to do. |
2286 | This can decay from a step to a continue, if e.g., we need to | |
2287 | implement single-stepping with breakpoints (software | |
2288 | single-step). */ | |
6b403daa | 2289 | int step; |
c7e8a53c | 2290 | |
c65d6b55 | 2291 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2292 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2293 | ||
372316f1 PA |
2294 | if (tp->suspend.waitstatus_pending_p) |
2295 | { | |
4100594e SM |
2296 | infrun_log_debug |
2297 | ("thread %s has pending wait " | |
2298 | "status %s (currently_stepping=%d).", | |
2299 | target_pid_to_str (tp->ptid).c_str (), | |
2300 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2301 | currently_stepping (tp)); | |
372316f1 | 2302 | |
5b6d1e4f | 2303 | tp->inf->process_target ()->threads_executing = true; |
719546c4 | 2304 | tp->resumed = true; |
372316f1 PA |
2305 | |
2306 | /* FIXME: What should we do if we are supposed to resume this | |
2307 | thread with a signal? Maybe we should maintain a queue of | |
2308 | pending signals to deliver. */ | |
2309 | if (sig != GDB_SIGNAL_0) | |
2310 | { | |
fd7dcb94 | 2311 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d TT |
2312 | gdb_signal_to_name (sig), |
2313 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2314 | } |
2315 | ||
2316 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2317 | |
2318 | if (target_can_async_p ()) | |
9516f85a AB |
2319 | { |
2320 | target_async (1); | |
2321 | /* Tell the event loop we have an event to process. */ | |
2322 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2323 | } | |
372316f1 PA |
2324 | return; |
2325 | } | |
2326 | ||
2327 | tp->stepped_breakpoint = 0; | |
2328 | ||
6b403daa PA |
2329 | /* Depends on stepped_breakpoint. */ |
2330 | step = currently_stepping (tp); | |
2331 | ||
74609e71 YQ |
2332 | if (current_inferior ()->waiting_for_vfork_done) |
2333 | { | |
48f9886d PA |
2334 | /* Don't try to single-step a vfork parent that is waiting for |
2335 | the child to get out of the shared memory region (by exec'ing | |
2336 | or exiting). This is particularly important on software | |
2337 | single-step archs, as the child process would trip on the | |
2338 | software single step breakpoint inserted for the parent | |
2339 | process. Since the parent will not actually execute any | |
2340 | instruction until the child is out of the shared region (such | |
2341 | are vfork's semantics), it is safe to simply continue it. | |
2342 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2343 | the parent, and tell it to `keep_going', which automatically | |
2344 | re-sets it stepping. */ | |
4100594e | 2345 | infrun_log_debug ("resume : clear step"); |
a09dd441 | 2346 | step = 0; |
74609e71 YQ |
2347 | } |
2348 | ||
7ca9b62a TBA |
2349 | CORE_ADDR pc = regcache_read_pc (regcache); |
2350 | ||
4100594e SM |
2351 | infrun_log_debug ("step=%d, signal=%s, trap_expected=%d, " |
2352 | "current thread [%s] at %s", | |
2353 | step, gdb_signal_to_symbol_string (sig), | |
2354 | tp->control.trap_expected, | |
2355 | target_pid_to_str (inferior_ptid).c_str (), | |
2356 | paddress (gdbarch, pc)); | |
c906108c | 2357 | |
c2c6d25f JM |
2358 | /* Normally, by the time we reach `resume', the breakpoints are either |
2359 | removed or inserted, as appropriate. The exception is if we're sitting | |
2360 | at a permanent breakpoint; we need to step over it, but permanent | |
2361 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2362 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2363 | { |
af48d08f PA |
2364 | if (sig != GDB_SIGNAL_0) |
2365 | { | |
2366 | /* We have a signal to pass to the inferior. The resume | |
2367 | may, or may not take us to the signal handler. If this | |
2368 | is a step, we'll need to stop in the signal handler, if | |
2369 | there's one, (if the target supports stepping into | |
2370 | handlers), or in the next mainline instruction, if | |
2371 | there's no handler. If this is a continue, we need to be | |
2372 | sure to run the handler with all breakpoints inserted. | |
2373 | In all cases, set a breakpoint at the current address | |
2374 | (where the handler returns to), and once that breakpoint | |
2375 | is hit, resume skipping the permanent breakpoint. If | |
2376 | that breakpoint isn't hit, then we've stepped into the | |
2377 | signal handler (or hit some other event). We'll delete | |
2378 | the step-resume breakpoint then. */ | |
2379 | ||
4100594e SM |
2380 | infrun_log_debug ("resume: skipping permanent breakpoint, " |
2381 | "deliver signal first"); | |
af48d08f PA |
2382 | |
2383 | clear_step_over_info (); | |
2384 | tp->control.trap_expected = 0; | |
2385 | ||
2386 | if (tp->control.step_resume_breakpoint == NULL) | |
2387 | { | |
2388 | /* Set a "high-priority" step-resume, as we don't want | |
2389 | user breakpoints at PC to trigger (again) when this | |
2390 | hits. */ | |
2391 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2392 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2393 | ||
2394 | tp->step_after_step_resume_breakpoint = step; | |
2395 | } | |
2396 | ||
2397 | insert_breakpoints (); | |
2398 | } | |
2399 | else | |
2400 | { | |
2401 | /* There's no signal to pass, we can go ahead and skip the | |
2402 | permanent breakpoint manually. */ | |
4100594e | 2403 | infrun_log_debug ("skipping permanent breakpoint"); |
af48d08f PA |
2404 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); |
2405 | /* Update pc to reflect the new address from which we will | |
2406 | execute instructions. */ | |
2407 | pc = regcache_read_pc (regcache); | |
2408 | ||
2409 | if (step) | |
2410 | { | |
2411 | /* We've already advanced the PC, so the stepping part | |
2412 | is done. Now we need to arrange for a trap to be | |
2413 | reported to handle_inferior_event. Set a breakpoint | |
2414 | at the current PC, and run to it. Don't update | |
2415 | prev_pc, because if we end in | |
44a1ee51 PA |
2416 | switch_back_to_stepped_thread, we want the "expected |
2417 | thread advanced also" branch to be taken. IOW, we | |
2418 | don't want this thread to step further from PC | |
af48d08f | 2419 | (overstep). */ |
1ac806b8 | 2420 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2421 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2422 | insert_breakpoints (); | |
2423 | ||
fbea99ea | 2424 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2425 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
719546c4 | 2426 | tp->resumed = true; |
af48d08f PA |
2427 | return; |
2428 | } | |
2429 | } | |
6d350bb5 | 2430 | } |
c2c6d25f | 2431 | |
c1e36e3e PA |
2432 | /* If we have a breakpoint to step over, make sure to do a single |
2433 | step only. Same if we have software watchpoints. */ | |
2434 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2435 | tp->control.may_range_step = 0; | |
2436 | ||
7da6a5b9 LM |
2437 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2438 | copy of the instruction at a different address. | |
237fc4c9 PA |
2439 | |
2440 | We can't use displaced stepping when we have a signal to deliver; | |
2441 | the comments for displaced_step_prepare explain why. The | |
2442 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2443 | signals' explain what we do instead. |
2444 | ||
2445 | We can't use displaced stepping when we are waiting for vfork_done | |
2446 | event, displaced stepping breaks the vfork child similarly as single | |
2447 | step software breakpoint. */ | |
3fc8eb30 PA |
2448 | if (tp->control.trap_expected |
2449 | && use_displaced_stepping (tp) | |
cb71640d | 2450 | && !step_over_info_valid_p () |
a493e3e2 | 2451 | && sig == GDB_SIGNAL_0 |
74609e71 | 2452 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2453 | { |
e088209c SM |
2454 | displaced_step_prepare_status prepare_status |
2455 | = displaced_step_prepare (tp); | |
fc1cf338 | 2456 | |
e088209c | 2457 | if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE) |
d56b7306 | 2458 | { |
4100594e | 2459 | infrun_log_debug ("Got placed in step-over queue"); |
4d9d9d04 PA |
2460 | |
2461 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2462 | return; |
2463 | } | |
e088209c | 2464 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_ERROR) |
3fc8eb30 PA |
2465 | { |
2466 | /* Fallback to stepping over the breakpoint in-line. */ | |
2467 | ||
2468 | if (target_is_non_stop_p ()) | |
2469 | stop_all_threads (); | |
2470 | ||
a01bda52 | 2471 | set_step_over_info (regcache->aspace (), |
21edc42f | 2472 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2473 | |
2474 | step = maybe_software_singlestep (gdbarch, pc); | |
2475 | ||
2476 | insert_breakpoints (); | |
2477 | } | |
e088209c | 2478 | else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_OK) |
3fc8eb30 | 2479 | { |
e088209c | 2480 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, NULL); |
3fc8eb30 | 2481 | } |
e088209c SM |
2482 | else |
2483 | gdb_assert_not_reached ("invalid displaced_step_prepare_status value"); | |
237fc4c9 PA |
2484 | } |
2485 | ||
2facfe5c | 2486 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2487 | else if (step) |
2facfe5c | 2488 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2489 | |
30852783 UW |
2490 | /* Currently, our software single-step implementation leads to different |
2491 | results than hardware single-stepping in one situation: when stepping | |
2492 | into delivering a signal which has an associated signal handler, | |
2493 | hardware single-step will stop at the first instruction of the handler, | |
2494 | while software single-step will simply skip execution of the handler. | |
2495 | ||
2496 | For now, this difference in behavior is accepted since there is no | |
2497 | easy way to actually implement single-stepping into a signal handler | |
2498 | without kernel support. | |
2499 | ||
2500 | However, there is one scenario where this difference leads to follow-on | |
2501 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2502 | and then single-stepping. In this case, the software single-step | |
2503 | behavior means that even if there is a *breakpoint* in the signal | |
2504 | handler, GDB still would not stop. | |
2505 | ||
2506 | Fortunately, we can at least fix this particular issue. We detect | |
2507 | here the case where we are about to deliver a signal while software | |
2508 | single-stepping with breakpoints removed. In this situation, we | |
2509 | revert the decisions to remove all breakpoints and insert single- | |
2510 | step breakpoints, and instead we install a step-resume breakpoint | |
2511 | at the current address, deliver the signal without stepping, and | |
2512 | once we arrive back at the step-resume breakpoint, actually step | |
2513 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2514 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2515 | && sig != GDB_SIGNAL_0 |
2516 | && step_over_info_valid_p ()) | |
30852783 UW |
2517 | { |
2518 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2519 | immediately after a handler returns, might already have |
30852783 UW |
2520 | a step-resume breakpoint set on the earlier handler. We cannot |
2521 | set another step-resume breakpoint; just continue on until the | |
2522 | original breakpoint is hit. */ | |
2523 | if (tp->control.step_resume_breakpoint == NULL) | |
2524 | { | |
2c03e5be | 2525 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2526 | tp->step_after_step_resume_breakpoint = 1; |
2527 | } | |
2528 | ||
34b7e8a6 | 2529 | delete_single_step_breakpoints (tp); |
30852783 | 2530 | |
31e77af2 | 2531 | clear_step_over_info (); |
30852783 | 2532 | tp->control.trap_expected = 0; |
31e77af2 PA |
2533 | |
2534 | insert_breakpoints (); | |
30852783 UW |
2535 | } |
2536 | ||
b0f16a3e SM |
2537 | /* If STEP is set, it's a request to use hardware stepping |
2538 | facilities. But in that case, we should never | |
2539 | use singlestep breakpoint. */ | |
34b7e8a6 | 2540 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2541 | |
fbea99ea | 2542 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2543 | if (tp->control.trap_expected) |
b0f16a3e SM |
2544 | { |
2545 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2546 | hit, either by single-stepping the thread with the breakpoint |
2547 | removed, or by displaced stepping, with the breakpoint inserted. | |
2548 | In the former case, we need to single-step only this thread, | |
2549 | and keep others stopped, as they can miss this breakpoint if | |
2550 | allowed to run. That's not really a problem for displaced | |
2551 | stepping, but, we still keep other threads stopped, in case | |
2552 | another thread is also stopped for a breakpoint waiting for | |
2553 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2554 | resume_ptid = inferior_ptid; |
2555 | } | |
fbea99ea PA |
2556 | else |
2557 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2558 | |
7f5ef605 PA |
2559 | if (execution_direction != EXEC_REVERSE |
2560 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2561 | { |
372316f1 PA |
2562 | /* There are two cases where we currently need to step a |
2563 | breakpoint instruction when we have a signal to deliver: | |
2564 | ||
2565 | - See handle_signal_stop where we handle random signals that | |
2566 | could take out us out of the stepping range. Normally, in | |
2567 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2568 | signal handler with a breakpoint at PC, but there are cases |
2569 | where we should _always_ single-step, even if we have a | |
2570 | step-resume breakpoint, like when a software watchpoint is | |
2571 | set. Assuming single-stepping and delivering a signal at the | |
2572 | same time would takes us to the signal handler, then we could | |
2573 | have removed the breakpoint at PC to step over it. However, | |
2574 | some hardware step targets (like e.g., Mac OS) can't step | |
2575 | into signal handlers, and for those, we need to leave the | |
2576 | breakpoint at PC inserted, as otherwise if the handler | |
2577 | recurses and executes PC again, it'll miss the breakpoint. | |
2578 | So we leave the breakpoint inserted anyway, but we need to | |
2579 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2580 | that adjust_pc_after_break doesn't end up confused. |
2581 | ||
2582 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2583 | in one thread after another thread that was stepping had been | |
2584 | momentarily paused for a step-over. When we re-resume the | |
2585 | stepping thread, it may be resumed from that address with a | |
2586 | breakpoint that hasn't trapped yet. Seen with | |
2587 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2588 | do displaced stepping. */ | |
2589 | ||
4100594e SM |
2590 | infrun_log_debug ("resume: [%s] stepped breakpoint", |
2591 | target_pid_to_str (tp->ptid).c_str ()); | |
7f5ef605 PA |
2592 | |
2593 | tp->stepped_breakpoint = 1; | |
2594 | ||
b0f16a3e SM |
2595 | /* Most targets can step a breakpoint instruction, thus |
2596 | executing it normally. But if this one cannot, just | |
2597 | continue and we will hit it anyway. */ | |
7f5ef605 | 2598 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2599 | step = 0; |
2600 | } | |
ef5cf84e | 2601 | |
b0f16a3e | 2602 | if (debug_displaced |
cb71640d | 2603 | && tp->control.trap_expected |
3fc8eb30 | 2604 | && use_displaced_stepping (tp) |
cb71640d | 2605 | && !step_over_info_valid_p ()) |
b0f16a3e | 2606 | { |
00431a78 | 2607 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2608 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2609 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2610 | gdb_byte buf[4]; | |
2611 | ||
2612 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2613 | paddress (resume_gdbarch, actual_pc)); | |
2614 | read_memory (actual_pc, buf, sizeof (buf)); | |
2615 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2616 | } | |
237fc4c9 | 2617 | |
b0f16a3e SM |
2618 | if (tp->control.may_range_step) |
2619 | { | |
2620 | /* If we're resuming a thread with the PC out of the step | |
2621 | range, then we're doing some nested/finer run control | |
2622 | operation, like stepping the thread out of the dynamic | |
2623 | linker or the displaced stepping scratch pad. We | |
2624 | shouldn't have allowed a range step then. */ | |
2625 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2626 | } | |
c1e36e3e | 2627 | |
64ce06e4 | 2628 | do_target_resume (resume_ptid, step, sig); |
719546c4 | 2629 | tp->resumed = true; |
c906108c | 2630 | } |
71d378ae PA |
2631 | |
2632 | /* Resume the inferior. SIG is the signal to give the inferior | |
2633 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2634 | rolls back state on error. */ | |
2635 | ||
aff4e175 | 2636 | static void |
71d378ae PA |
2637 | resume (gdb_signal sig) |
2638 | { | |
a70b8144 | 2639 | try |
71d378ae PA |
2640 | { |
2641 | resume_1 (sig); | |
2642 | } | |
230d2906 | 2643 | catch (const gdb_exception &ex) |
71d378ae PA |
2644 | { |
2645 | /* If resuming is being aborted for any reason, delete any | |
2646 | single-step breakpoint resume_1 may have created, to avoid | |
2647 | confusing the following resumption, and to avoid leaving | |
2648 | single-step breakpoints perturbing other threads, in case | |
2649 | we're running in non-stop mode. */ | |
2650 | if (inferior_ptid != null_ptid) | |
2651 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2652 | throw; |
71d378ae | 2653 | } |
71d378ae PA |
2654 | } |
2655 | ||
c906108c | 2656 | \f |
237fc4c9 | 2657 | /* Proceeding. */ |
c906108c | 2658 | |
4c2f2a79 PA |
2659 | /* See infrun.h. */ |
2660 | ||
2661 | /* Counter that tracks number of user visible stops. This can be used | |
2662 | to tell whether a command has proceeded the inferior past the | |
2663 | current location. This allows e.g., inferior function calls in | |
2664 | breakpoint commands to not interrupt the command list. When the | |
2665 | call finishes successfully, the inferior is standing at the same | |
2666 | breakpoint as if nothing happened (and so we don't call | |
2667 | normal_stop). */ | |
2668 | static ULONGEST current_stop_id; | |
2669 | ||
2670 | /* See infrun.h. */ | |
2671 | ||
2672 | ULONGEST | |
2673 | get_stop_id (void) | |
2674 | { | |
2675 | return current_stop_id; | |
2676 | } | |
2677 | ||
2678 | /* Called when we report a user visible stop. */ | |
2679 | ||
2680 | static void | |
2681 | new_stop_id (void) | |
2682 | { | |
2683 | current_stop_id++; | |
2684 | } | |
2685 | ||
c906108c SS |
2686 | /* Clear out all variables saying what to do when inferior is continued. |
2687 | First do this, then set the ones you want, then call `proceed'. */ | |
2688 | ||
a7212384 UW |
2689 | static void |
2690 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2691 | { |
4100594e | 2692 | infrun_log_debug ("%s", target_pid_to_str (tp->ptid).c_str ()); |
d6b48e9c | 2693 | |
372316f1 PA |
2694 | /* If we're starting a new sequence, then the previous finished |
2695 | single-step is no longer relevant. */ | |
2696 | if (tp->suspend.waitstatus_pending_p) | |
2697 | { | |
2698 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2699 | { | |
4100594e SM |
2700 | infrun_log_debug ("pending event of %s was a finished step. " |
2701 | "Discarding.", | |
2702 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2703 | |
2704 | tp->suspend.waitstatus_pending_p = 0; | |
2705 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2706 | } | |
4100594e | 2707 | else |
372316f1 | 2708 | { |
4100594e SM |
2709 | infrun_log_debug |
2710 | ("thread %s has pending wait status %s (currently_stepping=%d).", | |
2711 | target_pid_to_str (tp->ptid).c_str (), | |
2712 | target_waitstatus_to_string (&tp->suspend.waitstatus).c_str (), | |
2713 | currently_stepping (tp)); | |
372316f1 PA |
2714 | } |
2715 | } | |
2716 | ||
70509625 PA |
2717 | /* If this signal should not be seen by program, give it zero. |
2718 | Used for debugging signals. */ | |
2719 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2720 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2721 | ||
46e3ed7f | 2722 | delete tp->thread_fsm; |
243a9253 PA |
2723 | tp->thread_fsm = NULL; |
2724 | ||
16c381f0 JK |
2725 | tp->control.trap_expected = 0; |
2726 | tp->control.step_range_start = 0; | |
2727 | tp->control.step_range_end = 0; | |
c1e36e3e | 2728 | tp->control.may_range_step = 0; |
16c381f0 JK |
2729 | tp->control.step_frame_id = null_frame_id; |
2730 | tp->control.step_stack_frame_id = null_frame_id; | |
2731 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2732 | tp->control.step_start_function = NULL; |
a7212384 | 2733 | tp->stop_requested = 0; |
4e1c45ea | 2734 | |
16c381f0 | 2735 | tp->control.stop_step = 0; |
32400beb | 2736 | |
16c381f0 | 2737 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2738 | |
856e7dd6 | 2739 | tp->control.stepping_command = 0; |
17b2616c | 2740 | |
a7212384 | 2741 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2742 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2743 | } |
32400beb | 2744 | |
a7212384 | 2745 | void |
70509625 | 2746 | clear_proceed_status (int step) |
a7212384 | 2747 | { |
f2665db5 MM |
2748 | /* With scheduler-locking replay, stop replaying other threads if we're |
2749 | not replaying the user-visible resume ptid. | |
2750 | ||
2751 | This is a convenience feature to not require the user to explicitly | |
2752 | stop replaying the other threads. We're assuming that the user's | |
2753 | intent is to resume tracing the recorded process. */ | |
2754 | if (!non_stop && scheduler_mode == schedlock_replay | |
2755 | && target_record_is_replaying (minus_one_ptid) | |
2756 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2757 | execution_direction)) | |
2758 | target_record_stop_replaying (); | |
2759 | ||
08036331 | 2760 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2761 | { |
08036331 | 2762 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2763 | process_stratum_target *resume_target |
2764 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2765 | |
2766 | /* In all-stop mode, delete the per-thread status of all threads | |
2767 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2768 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2769 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2770 | } |
2771 | ||
d7e15655 | 2772 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2773 | { |
2774 | struct inferior *inferior; | |
2775 | ||
2776 | if (non_stop) | |
2777 | { | |
6c95b8df PA |
2778 | /* If in non-stop mode, only delete the per-thread status of |
2779 | the current thread. */ | |
a7212384 UW |
2780 | clear_proceed_status_thread (inferior_thread ()); |
2781 | } | |
6c95b8df | 2782 | |
d6b48e9c | 2783 | inferior = current_inferior (); |
16c381f0 | 2784 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2785 | } |
2786 | ||
76727919 | 2787 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2788 | } |
2789 | ||
99619bea PA |
2790 | /* Returns true if TP is still stopped at a breakpoint that needs |
2791 | stepping-over in order to make progress. If the breakpoint is gone | |
2792 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2793 | |
2794 | static int | |
6c4cfb24 | 2795 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2796 | { |
2797 | if (tp->stepping_over_breakpoint) | |
2798 | { | |
00431a78 | 2799 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2800 | |
a01bda52 | 2801 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2802 | regcache_read_pc (regcache)) |
2803 | == ordinary_breakpoint_here) | |
99619bea PA |
2804 | return 1; |
2805 | ||
2806 | tp->stepping_over_breakpoint = 0; | |
2807 | } | |
2808 | ||
2809 | return 0; | |
2810 | } | |
2811 | ||
6c4cfb24 PA |
2812 | /* Check whether thread TP still needs to start a step-over in order |
2813 | to make progress when resumed. Returns an bitwise or of enum | |
2814 | step_over_what bits, indicating what needs to be stepped over. */ | |
2815 | ||
8d297bbf | 2816 | static step_over_what |
6c4cfb24 PA |
2817 | thread_still_needs_step_over (struct thread_info *tp) |
2818 | { | |
8d297bbf | 2819 | step_over_what what = 0; |
6c4cfb24 PA |
2820 | |
2821 | if (thread_still_needs_step_over_bp (tp)) | |
2822 | what |= STEP_OVER_BREAKPOINT; | |
2823 | ||
2824 | if (tp->stepping_over_watchpoint | |
2825 | && !target_have_steppable_watchpoint) | |
2826 | what |= STEP_OVER_WATCHPOINT; | |
2827 | ||
2828 | return what; | |
2829 | } | |
2830 | ||
483805cf PA |
2831 | /* Returns true if scheduler locking applies. STEP indicates whether |
2832 | we're about to do a step/next-like command to a thread. */ | |
2833 | ||
2834 | static int | |
856e7dd6 | 2835 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2836 | { |
2837 | return (scheduler_mode == schedlock_on | |
2838 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2839 | && tp->control.stepping_command) |
2840 | || (scheduler_mode == schedlock_replay | |
2841 | && target_record_will_replay (minus_one_ptid, | |
2842 | execution_direction))); | |
483805cf PA |
2843 | } |
2844 | ||
5b6d1e4f PA |
2845 | /* Calls target_commit_resume on all targets. */ |
2846 | ||
2847 | static void | |
2848 | commit_resume_all_targets () | |
2849 | { | |
2850 | scoped_restore_current_thread restore_thread; | |
2851 | ||
2852 | /* Map between process_target and a representative inferior. This | |
2853 | is to avoid committing a resume in the same target more than | |
2854 | once. Resumptions must be idempotent, so this is an | |
2855 | optimization. */ | |
2856 | std::unordered_map<process_stratum_target *, inferior *> conn_inf; | |
2857 | ||
2858 | for (inferior *inf : all_non_exited_inferiors ()) | |
2859 | if (inf->has_execution ()) | |
2860 | conn_inf[inf->process_target ()] = inf; | |
2861 | ||
2862 | for (const auto &ci : conn_inf) | |
2863 | { | |
2864 | inferior *inf = ci.second; | |
2865 | switch_to_inferior_no_thread (inf); | |
2866 | target_commit_resume (); | |
2867 | } | |
2868 | } | |
2869 | ||
2f4fcf00 PA |
2870 | /* Check that all the targets we're about to resume are in non-stop |
2871 | mode. Ideally, we'd only care whether all targets support | |
2872 | target-async, but we're not there yet. E.g., stop_all_threads | |
2873 | doesn't know how to handle all-stop targets. Also, the remote | |
2874 | protocol in all-stop mode is synchronous, irrespective of | |
2875 | target-async, which means that things like a breakpoint re-set | |
2876 | triggered by one target would try to read memory from all targets | |
2877 | and fail. */ | |
2878 | ||
2879 | static void | |
2880 | check_multi_target_resumption (process_stratum_target *resume_target) | |
2881 | { | |
2882 | if (!non_stop && resume_target == nullptr) | |
2883 | { | |
2884 | scoped_restore_current_thread restore_thread; | |
2885 | ||
2886 | /* This is used to track whether we're resuming more than one | |
2887 | target. */ | |
2888 | process_stratum_target *first_connection = nullptr; | |
2889 | ||
2890 | /* The first inferior we see with a target that does not work in | |
2891 | always-non-stop mode. */ | |
2892 | inferior *first_not_non_stop = nullptr; | |
2893 | ||
2894 | for (inferior *inf : all_non_exited_inferiors (resume_target)) | |
2895 | { | |
2896 | switch_to_inferior_no_thread (inf); | |
2897 | ||
2898 | if (!target_has_execution) | |
2899 | continue; | |
2900 | ||
2901 | process_stratum_target *proc_target | |
2902 | = current_inferior ()->process_target(); | |
2903 | ||
2904 | if (!target_is_non_stop_p ()) | |
2905 | first_not_non_stop = inf; | |
2906 | ||
2907 | if (first_connection == nullptr) | |
2908 | first_connection = proc_target; | |
2909 | else if (first_connection != proc_target | |
2910 | && first_not_non_stop != nullptr) | |
2911 | { | |
2912 | switch_to_inferior_no_thread (first_not_non_stop); | |
2913 | ||
2914 | proc_target = current_inferior ()->process_target(); | |
2915 | ||
2916 | error (_("Connection %d (%s) does not support " | |
2917 | "multi-target resumption."), | |
2918 | proc_target->connection_number, | |
2919 | make_target_connection_string (proc_target).c_str ()); | |
2920 | } | |
2921 | } | |
2922 | } | |
2923 | } | |
2924 | ||
c906108c SS |
2925 | /* Basic routine for continuing the program in various fashions. |
2926 | ||
2927 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
2928 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
2929 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
2930 | |
2931 | You should call clear_proceed_status before calling proceed. */ | |
2932 | ||
2933 | void | |
64ce06e4 | 2934 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2935 | { |
e58b0e63 PA |
2936 | struct regcache *regcache; |
2937 | struct gdbarch *gdbarch; | |
e58b0e63 | 2938 | CORE_ADDR pc; |
4d9d9d04 PA |
2939 | struct execution_control_state ecss; |
2940 | struct execution_control_state *ecs = &ecss; | |
4d9d9d04 | 2941 | int started; |
c906108c | 2942 | |
e58b0e63 PA |
2943 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2944 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2945 | resuming the current thread. */ | |
2946 | if (!follow_fork ()) | |
2947 | { | |
2948 | /* The target for some reason decided not to resume. */ | |
2949 | normal_stop (); | |
f148b27e PA |
2950 | if (target_can_async_p ()) |
2951 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2952 | return; |
2953 | } | |
2954 | ||
842951eb PA |
2955 | /* We'll update this if & when we switch to a new thread. */ |
2956 | previous_inferior_ptid = inferior_ptid; | |
2957 | ||
e58b0e63 | 2958 | regcache = get_current_regcache (); |
ac7936df | 2959 | gdbarch = regcache->arch (); |
8b86c959 YQ |
2960 | const address_space *aspace = regcache->aspace (); |
2961 | ||
fc75c28b TBA |
2962 | pc = regcache_read_pc_protected (regcache); |
2963 | ||
08036331 | 2964 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 2965 | |
99619bea | 2966 | /* Fill in with reasonable starting values. */ |
08036331 | 2967 | init_thread_stepping_state (cur_thr); |
99619bea | 2968 | |
08036331 | 2969 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 2970 | |
5b6d1e4f PA |
2971 | ptid_t resume_ptid |
2972 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
2973 | process_stratum_target *resume_target | |
2974 | = user_visible_resume_target (resume_ptid); | |
2975 | ||
2f4fcf00 PA |
2976 | check_multi_target_resumption (resume_target); |
2977 | ||
2acceee2 | 2978 | if (addr == (CORE_ADDR) -1) |
c906108c | 2979 | { |
08036331 | 2980 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 2981 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 2982 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2983 | /* There is a breakpoint at the address we will resume at, |
2984 | step one instruction before inserting breakpoints so that | |
2985 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2986 | breakpoint). |
2987 | ||
2988 | Note, we don't do this in reverse, because we won't | |
2989 | actually be executing the breakpoint insn anyway. | |
2990 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 2991 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
2992 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2993 | && gdbarch_single_step_through_delay (gdbarch, | |
2994 | get_current_frame ())) | |
3352ef37 AC |
2995 | /* We stepped onto an instruction that needs to be stepped |
2996 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 2997 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
2998 | } |
2999 | else | |
3000 | { | |
515630c5 | 3001 | regcache_write_pc (regcache, addr); |
c906108c SS |
3002 | } |
3003 | ||
70509625 | 3004 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 3005 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 3006 | |
4d9d9d04 PA |
3007 | /* If an exception is thrown from this point on, make sure to |
3008 | propagate GDB's knowledge of the executing state to the | |
3009 | frontend/user running state. */ | |
5b6d1e4f | 3010 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
3011 | |
3012 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3013 | threads (e.g., we might need to set threads stepping over | |
3014 | breakpoints first), from the user/frontend's point of view, all | |
3015 | threads in RESUME_PTID are now running. Unless we're calling an | |
3016 | inferior function, as in that case we pretend the inferior | |
3017 | doesn't run at all. */ | |
08036331 | 3018 | if (!cur_thr->control.in_infcall) |
719546c4 | 3019 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3020 | |
4100594e SM |
3021 | infrun_log_debug ("addr=%s, signal=%s", paddress (gdbarch, addr), |
3022 | gdb_signal_to_symbol_string (siggnal)); | |
527159b7 | 3023 | |
4d9d9d04 PA |
3024 | annotate_starting (); |
3025 | ||
3026 | /* Make sure that output from GDB appears before output from the | |
3027 | inferior. */ | |
3028 | gdb_flush (gdb_stdout); | |
3029 | ||
d930703d PA |
3030 | /* Since we've marked the inferior running, give it the terminal. A |
3031 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3032 | still detect attempts to unblock a stuck connection with repeated | |
3033 | Ctrl-C from within target_pass_ctrlc). */ | |
3034 | target_terminal::inferior (); | |
3035 | ||
4d9d9d04 PA |
3036 | /* In a multi-threaded task we may select another thread and |
3037 | then continue or step. | |
3038 | ||
3039 | But if a thread that we're resuming had stopped at a breakpoint, | |
3040 | it will immediately cause another breakpoint stop without any | |
3041 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3042 | we must step over it first. | |
3043 | ||
3044 | Look for threads other than the current (TP) that reported a | |
3045 | breakpoint hit and haven't been resumed yet since. */ | |
3046 | ||
3047 | /* If scheduler locking applies, we can avoid iterating over all | |
3048 | threads. */ | |
08036331 | 3049 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3050 | { |
5b6d1e4f PA |
3051 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3052 | resume_ptid)) | |
08036331 | 3053 | { |
f3f8ece4 PA |
3054 | switch_to_thread_no_regs (tp); |
3055 | ||
4d9d9d04 PA |
3056 | /* Ignore the current thread here. It's handled |
3057 | afterwards. */ | |
08036331 | 3058 | if (tp == cur_thr) |
4d9d9d04 | 3059 | continue; |
c906108c | 3060 | |
4d9d9d04 PA |
3061 | if (!thread_still_needs_step_over (tp)) |
3062 | continue; | |
3063 | ||
3064 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3065 | |
4100594e SM |
3066 | infrun_log_debug ("need to step-over [%s] first", |
3067 | target_pid_to_str (tp->ptid).c_str ()); | |
99619bea | 3068 | |
bb88694d | 3069 | global_thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3070 | } |
f3f8ece4 PA |
3071 | |
3072 | switch_to_thread (cur_thr); | |
30852783 UW |
3073 | } |
3074 | ||
4d9d9d04 PA |
3075 | /* Enqueue the current thread last, so that we move all other |
3076 | threads over their breakpoints first. */ | |
08036331 | 3077 | if (cur_thr->stepping_over_breakpoint) |
bb88694d | 3078 | global_thread_step_over_chain_enqueue (cur_thr); |
30852783 | 3079 | |
4d9d9d04 PA |
3080 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3081 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3082 | advanced. Must do this before resuming any thread, as in | |
3083 | all-stop/remote, once we resume we can't send any other packet | |
3084 | until the target stops again. */ | |
fc75c28b | 3085 | cur_thr->prev_pc = regcache_read_pc_protected (regcache); |
99619bea | 3086 | |
a9bc57b9 TT |
3087 | { |
3088 | scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume (); | |
85ad3aaf | 3089 | |
a9bc57b9 | 3090 | started = start_step_over (); |
c906108c | 3091 | |
a9bc57b9 TT |
3092 | if (step_over_info_valid_p ()) |
3093 | { | |
3094 | /* Either this thread started a new in-line step over, or some | |
3095 | other thread was already doing one. In either case, don't | |
3096 | resume anything else until the step-over is finished. */ | |
3097 | } | |
3098 | else if (started && !target_is_non_stop_p ()) | |
3099 | { | |
3100 | /* A new displaced stepping sequence was started. In all-stop, | |
3101 | we can't talk to the target anymore until it next stops. */ | |
3102 | } | |
3103 | else if (!non_stop && target_is_non_stop_p ()) | |
3104 | { | |
3105 | /* In all-stop, but the target is always in non-stop mode. | |
3106 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3107 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3108 | resume_ptid)) | |
3109 | { | |
3110 | switch_to_thread_no_regs (tp); | |
3111 | ||
f9fac3c8 SM |
3112 | if (!tp->inf->has_execution ()) |
3113 | { | |
4100594e SM |
3114 | infrun_log_debug ("[%s] target has no execution", |
3115 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3116 | continue; |
3117 | } | |
f3f8ece4 | 3118 | |
f9fac3c8 SM |
3119 | if (tp->resumed) |
3120 | { | |
4100594e SM |
3121 | infrun_log_debug ("[%s] resumed", |
3122 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3123 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
3124 | continue; | |
3125 | } | |
fbea99ea | 3126 | |
f9fac3c8 SM |
3127 | if (thread_is_in_step_over_chain (tp)) |
3128 | { | |
4100594e SM |
3129 | infrun_log_debug ("[%s] needs step-over", |
3130 | target_pid_to_str (tp->ptid).c_str ()); | |
f9fac3c8 SM |
3131 | continue; |
3132 | } | |
fbea99ea | 3133 | |
4100594e SM |
3134 | infrun_log_debug ("resuming %s", |
3135 | target_pid_to_str (tp->ptid).c_str ()); | |
fbea99ea | 3136 | |
f9fac3c8 SM |
3137 | reset_ecs (ecs, tp); |
3138 | switch_to_thread (tp); | |
3139 | keep_going_pass_signal (ecs); | |
3140 | if (!ecs->wait_some_more) | |
3141 | error (_("Command aborted.")); | |
3142 | } | |
a9bc57b9 | 3143 | } |
08036331 | 3144 | else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3145 | { |
3146 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3147 | reset_ecs (ecs, cur_thr); |
3148 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3149 | keep_going_pass_signal (ecs); |
3150 | if (!ecs->wait_some_more) | |
3151 | error (_("Command aborted.")); | |
3152 | } | |
3153 | } | |
c906108c | 3154 | |
5b6d1e4f | 3155 | commit_resume_all_targets (); |
85ad3aaf | 3156 | |
731f534f | 3157 | finish_state.release (); |
c906108c | 3158 | |
873657b9 PA |
3159 | /* If we've switched threads above, switch back to the previously |
3160 | current thread. We don't want the user to see a different | |
3161 | selected thread. */ | |
3162 | switch_to_thread (cur_thr); | |
3163 | ||
0b333c5e PA |
3164 | /* Tell the event loop to wait for it to stop. If the target |
3165 | supports asynchronous execution, it'll do this from within | |
3166 | target_resume. */ | |
362646f5 | 3167 | if (!target_can_async_p ()) |
0b333c5e | 3168 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3169 | } |
c906108c SS |
3170 | \f |
3171 | ||
3172 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3173 | |
c906108c | 3174 | void |
8621d6a9 | 3175 | start_remote (int from_tty) |
c906108c | 3176 | { |
5b6d1e4f PA |
3177 | inferior *inf = current_inferior (); |
3178 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3179 | |
1777feb0 | 3180 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3181 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3182 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3183 | nothing is returned (instead of just blocking). Because of this, |
3184 | targets expecting an immediate response need to, internally, set | |
3185 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3186 | timeout. */ |
6426a772 JM |
3187 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3188 | differentiate to its caller what the state of the target is after | |
3189 | the initial open has been performed. Here we're assuming that | |
3190 | the target has stopped. It should be possible to eventually have | |
3191 | target_open() return to the caller an indication that the target | |
3192 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3193 | for an async run. */ |
5b6d1e4f | 3194 | wait_for_inferior (inf); |
8621d6a9 DJ |
3195 | |
3196 | /* Now that the inferior has stopped, do any bookkeeping like | |
3197 | loading shared libraries. We want to do this before normal_stop, | |
3198 | so that the displayed frame is up to date. */ | |
8b88a78e | 3199 | post_create_inferior (current_top_target (), from_tty); |
8621d6a9 | 3200 | |
6426a772 | 3201 | normal_stop (); |
c906108c SS |
3202 | } |
3203 | ||
3204 | /* Initialize static vars when a new inferior begins. */ | |
3205 | ||
3206 | void | |
96baa820 | 3207 | init_wait_for_inferior (void) |
c906108c SS |
3208 | { |
3209 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3210 | |
c906108c SS |
3211 | breakpoint_init_inferior (inf_starting); |
3212 | ||
70509625 | 3213 | clear_proceed_status (0); |
9f976b41 | 3214 | |
ab1ddbcf | 3215 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3216 | |
842951eb | 3217 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3218 | } |
237fc4c9 | 3219 | |
c906108c | 3220 | \f |
488f131b | 3221 | |
ec9499be | 3222 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3223 | |
568d6575 UW |
3224 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3225 | struct execution_control_state *ecs); | |
3226 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3227 | struct execution_control_state *ecs); | |
4f5d7f63 | 3228 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3229 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3230 | struct frame_info *); |
611c83ae | 3231 | |
bdc36728 | 3232 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3233 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3234 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3235 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3236 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3237 | |
252fbfc8 PA |
3238 | /* This function is attached as a "thread_stop_requested" observer. |
3239 | Cleanup local state that assumed the PTID was to be resumed, and | |
3240 | report the stop to the frontend. */ | |
3241 | ||
2c0b251b | 3242 | static void |
252fbfc8 PA |
3243 | infrun_thread_stop_requested (ptid_t ptid) |
3244 | { | |
5b6d1e4f PA |
3245 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3246 | ||
c65d6b55 PA |
3247 | /* PTID was requested to stop. If the thread was already stopped, |
3248 | but the user/frontend doesn't know about that yet (e.g., the | |
3249 | thread had been temporarily paused for some step-over), set up | |
3250 | for reporting the stop now. */ | |
5b6d1e4f | 3251 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3252 | { |
3253 | if (tp->state != THREAD_RUNNING) | |
3254 | continue; | |
3255 | if (tp->executing) | |
3256 | continue; | |
c65d6b55 | 3257 | |
08036331 PA |
3258 | /* Remove matching threads from the step-over queue, so |
3259 | start_step_over doesn't try to resume them | |
3260 | automatically. */ | |
3261 | if (thread_is_in_step_over_chain (tp)) | |
bb88694d | 3262 | global_thread_step_over_chain_remove (tp); |
c65d6b55 | 3263 | |
08036331 PA |
3264 | /* If the thread is stopped, but the user/frontend doesn't |
3265 | know about that yet, queue a pending event, as if the | |
3266 | thread had just stopped now. Unless the thread already had | |
3267 | a pending event. */ | |
3268 | if (!tp->suspend.waitstatus_pending_p) | |
3269 | { | |
3270 | tp->suspend.waitstatus_pending_p = 1; | |
3271 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3272 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3273 | } | |
c65d6b55 | 3274 | |
08036331 PA |
3275 | /* Clear the inline-frame state, since we're re-processing the |
3276 | stop. */ | |
5b6d1e4f | 3277 | clear_inline_frame_state (tp); |
c65d6b55 | 3278 | |
08036331 PA |
3279 | /* If this thread was paused because some other thread was |
3280 | doing an inline-step over, let that finish first. Once | |
3281 | that happens, we'll restart all threads and consume pending | |
3282 | stop events then. */ | |
3283 | if (step_over_info_valid_p ()) | |
3284 | continue; | |
3285 | ||
3286 | /* Otherwise we can process the (new) pending event now. Set | |
3287 | it so this pending event is considered by | |
3288 | do_target_wait. */ | |
719546c4 | 3289 | tp->resumed = true; |
08036331 | 3290 | } |
252fbfc8 PA |
3291 | } |
3292 | ||
a07daef3 PA |
3293 | static void |
3294 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3295 | { | |
5b6d1e4f PA |
3296 | if (target_last_proc_target == tp->inf->process_target () |
3297 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3298 | nullify_last_target_wait_ptid (); |
3299 | } | |
3300 | ||
0cbcdb96 PA |
3301 | /* Delete the step resume, single-step and longjmp/exception resume |
3302 | breakpoints of TP. */ | |
4e1c45ea | 3303 | |
0cbcdb96 PA |
3304 | static void |
3305 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3306 | { |
0cbcdb96 PA |
3307 | delete_step_resume_breakpoint (tp); |
3308 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3309 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3310 | } |
3311 | ||
0cbcdb96 PA |
3312 | /* If the target still has execution, call FUNC for each thread that |
3313 | just stopped. In all-stop, that's all the non-exited threads; in | |
3314 | non-stop, that's the current thread, only. */ | |
3315 | ||
3316 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3317 | (struct thread_info *tp); | |
4e1c45ea PA |
3318 | |
3319 | static void | |
0cbcdb96 | 3320 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3321 | { |
d7e15655 | 3322 | if (!target_has_execution || inferior_ptid == null_ptid) |
4e1c45ea PA |
3323 | return; |
3324 | ||
fbea99ea | 3325 | if (target_is_non_stop_p ()) |
4e1c45ea | 3326 | { |
0cbcdb96 PA |
3327 | /* If in non-stop mode, only the current thread stopped. */ |
3328 | func (inferior_thread ()); | |
4e1c45ea PA |
3329 | } |
3330 | else | |
0cbcdb96 | 3331 | { |
0cbcdb96 | 3332 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3333 | for (thread_info *tp : all_non_exited_threads ()) |
3334 | func (tp); | |
0cbcdb96 PA |
3335 | } |
3336 | } | |
3337 | ||
3338 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3339 | the threads that just stopped. */ | |
3340 | ||
3341 | static void | |
3342 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3343 | { | |
3344 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3345 | } |
3346 | ||
3347 | /* Delete the single-step breakpoints of the threads that just | |
3348 | stopped. */ | |
7c16b83e | 3349 | |
34b7e8a6 PA |
3350 | static void |
3351 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3352 | { | |
3353 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3354 | } |
3355 | ||
221e1a37 | 3356 | /* See infrun.h. */ |
223698f8 | 3357 | |
221e1a37 | 3358 | void |
223698f8 DE |
3359 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3360 | const struct target_waitstatus *ws) | |
3361 | { | |
23fdd69e | 3362 | std::string status_string = target_waitstatus_to_string (ws); |
d7e74731 | 3363 | string_file stb; |
223698f8 DE |
3364 | |
3365 | /* The text is split over several lines because it was getting too long. | |
3366 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3367 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3368 | is set. */ | |
3369 | ||
d7e74731 | 3370 | stb.printf ("infrun: target_wait (%d.%ld.%ld", |
e99b03dc | 3371 | waiton_ptid.pid (), |
e38504b3 | 3372 | waiton_ptid.lwp (), |
cc6bcb54 | 3373 | waiton_ptid.tid ()); |
e99b03dc | 3374 | if (waiton_ptid.pid () != -1) |
a068643d | 3375 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid).c_str ()); |
d7e74731 PA |
3376 | stb.printf (", status) =\n"); |
3377 | stb.printf ("infrun: %d.%ld.%ld [%s],\n", | |
e99b03dc | 3378 | result_ptid.pid (), |
e38504b3 | 3379 | result_ptid.lwp (), |
cc6bcb54 | 3380 | result_ptid.tid (), |
a068643d | 3381 | target_pid_to_str (result_ptid).c_str ()); |
23fdd69e | 3382 | stb.printf ("infrun: %s\n", status_string.c_str ()); |
223698f8 DE |
3383 | |
3384 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3385 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3386 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3387 | } |
3388 | ||
372316f1 PA |
3389 | /* Select a thread at random, out of those which are resumed and have |
3390 | had events. */ | |
3391 | ||
3392 | static struct thread_info * | |
5b6d1e4f | 3393 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3394 | { |
372316f1 | 3395 | int num_events = 0; |
08036331 | 3396 | |
5b6d1e4f | 3397 | auto has_event = [&] (thread_info *tp) |
08036331 | 3398 | { |
5b6d1e4f PA |
3399 | return (tp->ptid.matches (waiton_ptid) |
3400 | && tp->resumed | |
08036331 PA |
3401 | && tp->suspend.waitstatus_pending_p); |
3402 | }; | |
372316f1 PA |
3403 | |
3404 | /* First see how many events we have. Count only resumed threads | |
3405 | that have an event pending. */ | |
5b6d1e4f | 3406 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3407 | if (has_event (tp)) |
372316f1 PA |
3408 | num_events++; |
3409 | ||
3410 | if (num_events == 0) | |
3411 | return NULL; | |
3412 | ||
3413 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3414 | int random_selector = (int) ((num_events * (double) rand ()) |
3415 | / (RAND_MAX + 1.0)); | |
372316f1 | 3416 | |
4100594e SM |
3417 | if (num_events > 1) |
3418 | infrun_log_debug ("Found %d events, selecting #%d", | |
3419 | num_events, random_selector); | |
372316f1 PA |
3420 | |
3421 | /* Select the Nth thread that has had an event. */ | |
5b6d1e4f | 3422 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3423 | if (has_event (tp)) |
372316f1 | 3424 | if (random_selector-- == 0) |
08036331 | 3425 | return tp; |
372316f1 | 3426 | |
08036331 | 3427 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3428 | } |
3429 | ||
3430 | /* Wrapper for target_wait that first checks whether threads have | |
3431 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3432 | more events. INF is the inferior we're using to call target_wait |
3433 | on. */ | |
372316f1 PA |
3434 | |
3435 | static ptid_t | |
5b6d1e4f PA |
3436 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
3437 | target_waitstatus *status, int options) | |
372316f1 PA |
3438 | { |
3439 | ptid_t event_ptid; | |
3440 | struct thread_info *tp; | |
3441 | ||
24ed6739 AB |
3442 | /* We know that we are looking for an event in the target of inferior |
3443 | INF, but we don't know which thread the event might come from. As | |
3444 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3445 | the wait code relies on it - doing so is always a mistake. */ | |
3446 | switch_to_inferior_no_thread (inf); | |
3447 | ||
372316f1 PA |
3448 | /* First check if there is a resumed thread with a wait status |
3449 | pending. */ | |
d7e15655 | 3450 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3451 | { |
5b6d1e4f | 3452 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3453 | } |
3454 | else | |
3455 | { | |
4100594e SM |
3456 | infrun_log_debug ("Waiting for specific thread %s.", |
3457 | target_pid_to_str (ptid).c_str ()); | |
372316f1 PA |
3458 | |
3459 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3460 | tp = find_thread_ptid (inf, ptid); |
372316f1 PA |
3461 | gdb_assert (tp != NULL); |
3462 | if (!tp->suspend.waitstatus_pending_p) | |
3463 | tp = NULL; | |
3464 | } | |
3465 | ||
3466 | if (tp != NULL | |
3467 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3468 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3469 | { | |
00431a78 | 3470 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3471 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3472 | CORE_ADDR pc; |
3473 | int discard = 0; | |
3474 | ||
3475 | pc = regcache_read_pc (regcache); | |
3476 | ||
3477 | if (pc != tp->suspend.stop_pc) | |
3478 | { | |
4100594e SM |
3479 | infrun_log_debug ("PC of %s changed. was=%s, now=%s", |
3480 | target_pid_to_str (tp->ptid).c_str (), | |
3481 | paddress (gdbarch, tp->suspend.stop_pc), | |
3482 | paddress (gdbarch, pc)); | |
372316f1 PA |
3483 | discard = 1; |
3484 | } | |
a01bda52 | 3485 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 | 3486 | { |
4100594e SM |
3487 | infrun_log_debug ("previous breakpoint of %s, at %s gone", |
3488 | target_pid_to_str (tp->ptid).c_str (), | |
3489 | paddress (gdbarch, pc)); | |
372316f1 PA |
3490 | |
3491 | discard = 1; | |
3492 | } | |
3493 | ||
3494 | if (discard) | |
3495 | { | |
4100594e SM |
3496 | infrun_log_debug ("pending event of %s cancelled.", |
3497 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3498 | |
3499 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3500 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3501 | } | |
3502 | } | |
3503 | ||
3504 | if (tp != NULL) | |
3505 | { | |
4100594e SM |
3506 | infrun_log_debug ("Using pending wait status %s for %s.", |
3507 | target_waitstatus_to_string | |
3508 | (&tp->suspend.waitstatus).c_str (), | |
3509 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
3510 | |
3511 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3512 | if it was a software breakpoint (and the target doesn't | |
3513 | always adjust the PC itself). */ | |
3514 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3515 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3516 | { | |
3517 | struct regcache *regcache; | |
3518 | struct gdbarch *gdbarch; | |
3519 | int decr_pc; | |
3520 | ||
00431a78 | 3521 | regcache = get_thread_regcache (tp); |
ac7936df | 3522 | gdbarch = regcache->arch (); |
372316f1 PA |
3523 | |
3524 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3525 | if (decr_pc != 0) | |
3526 | { | |
3527 | CORE_ADDR pc; | |
3528 | ||
3529 | pc = regcache_read_pc (regcache); | |
3530 | regcache_write_pc (regcache, pc + decr_pc); | |
3531 | } | |
3532 | } | |
3533 | ||
3534 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3535 | *status = tp->suspend.waitstatus; | |
3536 | tp->suspend.waitstatus_pending_p = 0; | |
3537 | ||
3538 | /* Wake up the event loop again, until all pending events are | |
3539 | processed. */ | |
3540 | if (target_is_async_p ()) | |
3541 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3542 | return tp->ptid; | |
3543 | } | |
3544 | ||
3545 | /* But if we don't find one, we'll have to wait. */ | |
3546 | ||
3547 | if (deprecated_target_wait_hook) | |
3548 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3549 | else | |
3550 | event_ptid = target_wait (ptid, status, options); | |
3551 | ||
3552 | return event_ptid; | |
3553 | } | |
3554 | ||
5b6d1e4f PA |
3555 | /* Returns true if INF has any resumed thread with a status |
3556 | pending. */ | |
3557 | ||
3558 | static bool | |
3559 | threads_are_resumed_pending_p (inferior *inf) | |
3560 | { | |
3561 | for (thread_info *tp : inf->non_exited_threads ()) | |
3562 | if (tp->resumed | |
3563 | && tp->suspend.waitstatus_pending_p) | |
3564 | return true; | |
3565 | ||
3566 | return false; | |
3567 | } | |
3568 | ||
3569 | /* Wrapper for target_wait that first checks whether threads have | |
3570 | pending statuses to report before actually asking the target for | |
3571 | more events. Polls for events from all inferiors/targets. */ | |
3572 | ||
3573 | static bool | |
3574 | do_target_wait (ptid_t wait_ptid, execution_control_state *ecs, int options) | |
3575 | { | |
3576 | int num_inferiors = 0; | |
3577 | int random_selector; | |
3578 | ||
3579 | /* For fairness, we pick the first inferior/target to poll at | |
3580 | random, and then continue polling the rest of the inferior list | |
3581 | starting from that one in a circular fashion until the whole list | |
3582 | is polled once. */ | |
3583 | ||
3584 | auto inferior_matches = [&wait_ptid] (inferior *inf) | |
3585 | { | |
3586 | return (inf->process_target () != NULL | |
3587 | && (threads_are_executing (inf->process_target ()) | |
3588 | || threads_are_resumed_pending_p (inf)) | |
3589 | && ptid_t (inf->pid).matches (wait_ptid)); | |
3590 | }; | |
3591 | ||
3592 | /* First see how many resumed inferiors we have. */ | |
3593 | for (inferior *inf : all_inferiors ()) | |
3594 | if (inferior_matches (inf)) | |
3595 | num_inferiors++; | |
3596 | ||
3597 | if (num_inferiors == 0) | |
3598 | { | |
3599 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3600 | return false; | |
3601 | } | |
3602 | ||
3603 | /* Now randomly pick an inferior out of those that were resumed. */ | |
3604 | random_selector = (int) | |
3605 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3606 | ||
4100594e SM |
3607 | if (num_inferiors > 1) |
3608 | infrun_log_debug ("Found %d inferiors, starting at #%d", | |
3609 | num_inferiors, random_selector); | |
5b6d1e4f PA |
3610 | |
3611 | /* Select the Nth inferior that was resumed. */ | |
3612 | ||
3613 | inferior *selected = nullptr; | |
3614 | ||
3615 | for (inferior *inf : all_inferiors ()) | |
3616 | if (inferior_matches (inf)) | |
3617 | if (random_selector-- == 0) | |
3618 | { | |
3619 | selected = inf; | |
3620 | break; | |
3621 | } | |
3622 | ||
3623 | /* Now poll for events out of each of the resumed inferior's | |
3624 | targets, starting from the selected one. */ | |
3625 | ||
3626 | auto do_wait = [&] (inferior *inf) | |
3627 | { | |
5b6d1e4f PA |
3628 | ecs->ptid = do_target_wait_1 (inf, wait_ptid, &ecs->ws, options); |
3629 | ecs->target = inf->process_target (); | |
3630 | return (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3631 | }; | |
3632 | ||
3633 | /* Needed in all-stop+target-non-stop mode, because we end up here | |
3634 | spuriously after the target is all stopped and we've already | |
3635 | reported the stop to the user, polling for events. */ | |
3636 | scoped_restore_current_thread restore_thread; | |
3637 | ||
3638 | int inf_num = selected->num; | |
3639 | for (inferior *inf = selected; inf != NULL; inf = inf->next) | |
3640 | if (inferior_matches (inf)) | |
3641 | if (do_wait (inf)) | |
3642 | return true; | |
3643 | ||
3644 | for (inferior *inf = inferior_list; | |
3645 | inf != NULL && inf->num < inf_num; | |
3646 | inf = inf->next) | |
3647 | if (inferior_matches (inf)) | |
3648 | if (do_wait (inf)) | |
3649 | return true; | |
3650 | ||
3651 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3652 | return false; | |
3653 | } | |
3654 | ||
24291992 PA |
3655 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3656 | detaching while a thread is displaced stepping is a recipe for | |
3657 | crashing it, as nothing would readjust the PC out of the scratch | |
3658 | pad. */ | |
3659 | ||
3660 | void | |
3661 | prepare_for_detach (void) | |
3662 | { | |
3663 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3664 | ptid_t pid_ptid = ptid_t (inf->pid); |
24291992 | 3665 | |
e088209c | 3666 | // displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf); |
24291992 PA |
3667 | |
3668 | /* Is any thread of this process displaced stepping? If not, | |
3669 | there's nothing else to do. */ | |
e088209c | 3670 | if (displaced_step_in_progress (inf)) |
24291992 PA |
3671 | return; |
3672 | ||
4100594e | 3673 | infrun_log_debug ("displaced-stepping in-process while detaching"); |
24291992 | 3674 | |
9bcb1f16 | 3675 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3676 | |
e088209c SM |
3677 | // FIXME |
3678 | while (false) | |
24291992 | 3679 | { |
24291992 PA |
3680 | struct execution_control_state ecss; |
3681 | struct execution_control_state *ecs; | |
3682 | ||
3683 | ecs = &ecss; | |
3684 | memset (ecs, 0, sizeof (*ecs)); | |
3685 | ||
3686 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3687 | /* Flush target cache before starting to handle each event. |
3688 | Target was running and cache could be stale. This is just a | |
3689 | heuristic. Running threads may modify target memory, but we | |
3690 | don't get any event. */ | |
3691 | target_dcache_invalidate (); | |
24291992 | 3692 | |
5b6d1e4f | 3693 | do_target_wait (pid_ptid, ecs, 0); |
24291992 PA |
3694 | |
3695 | if (debug_infrun) | |
3696 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3697 | ||
3698 | /* If an error happens while handling the event, propagate GDB's | |
3699 | knowledge of the executing state to the frontend/user running | |
3700 | state. */ | |
5b6d1e4f PA |
3701 | scoped_finish_thread_state finish_state (inf->process_target (), |
3702 | minus_one_ptid); | |
24291992 PA |
3703 | |
3704 | /* Now figure out what to do with the result of the result. */ | |
3705 | handle_inferior_event (ecs); | |
3706 | ||
3707 | /* No error, don't finish the state yet. */ | |
731f534f | 3708 | finish_state.release (); |
24291992 PA |
3709 | |
3710 | /* Breakpoints and watchpoints are not installed on the target | |
3711 | at this point, and signals are passed directly to the | |
3712 | inferior, so this must mean the process is gone. */ | |
3713 | if (!ecs->wait_some_more) | |
3714 | { | |
9bcb1f16 | 3715 | restore_detaching.release (); |
24291992 PA |
3716 | error (_("Program exited while detaching")); |
3717 | } | |
3718 | } | |
3719 | ||
9bcb1f16 | 3720 | restore_detaching.release (); |
24291992 PA |
3721 | } |
3722 | ||
cd0fc7c3 | 3723 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3724 | |
cd0fc7c3 SS |
3725 | If inferior gets a signal, we may decide to start it up again |
3726 | instead of returning. That is why there is a loop in this function. | |
3727 | When this function actually returns it means the inferior | |
3728 | should be left stopped and GDB should read more commands. */ | |
3729 | ||
5b6d1e4f PA |
3730 | static void |
3731 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3732 | { |
4100594e | 3733 | infrun_log_debug ("wait_for_inferior ()"); |
527159b7 | 3734 | |
4c41382a | 3735 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3736 | |
e6f5c25b PA |
3737 | /* If an error happens while handling the event, propagate GDB's |
3738 | knowledge of the executing state to the frontend/user running | |
3739 | state. */ | |
5b6d1e4f PA |
3740 | scoped_finish_thread_state finish_state |
3741 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 3742 | |
c906108c SS |
3743 | while (1) |
3744 | { | |
ae25568b PA |
3745 | struct execution_control_state ecss; |
3746 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 3747 | |
ae25568b PA |
3748 | memset (ecs, 0, sizeof (*ecs)); |
3749 | ||
ec9499be | 3750 | overlay_cache_invalid = 1; |
ec9499be | 3751 | |
f15cb84a YQ |
3752 | /* Flush target cache before starting to handle each event. |
3753 | Target was running and cache could be stale. This is just a | |
3754 | heuristic. Running threads may modify target memory, but we | |
3755 | don't get any event. */ | |
3756 | target_dcache_invalidate (); | |
3757 | ||
5b6d1e4f PA |
3758 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
3759 | ecs->target = inf->process_target (); | |
c906108c | 3760 | |
f00150c9 | 3761 | if (debug_infrun) |
5b6d1e4f | 3762 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3763 | |
cd0fc7c3 SS |
3764 | /* Now figure out what to do with the result of the result. */ |
3765 | handle_inferior_event (ecs); | |
c906108c | 3766 | |
cd0fc7c3 SS |
3767 | if (!ecs->wait_some_more) |
3768 | break; | |
3769 | } | |
4e1c45ea | 3770 | |
e6f5c25b | 3771 | /* No error, don't finish the state yet. */ |
731f534f | 3772 | finish_state.release (); |
cd0fc7c3 | 3773 | } |
c906108c | 3774 | |
d3d4baed PA |
3775 | /* Cleanup that reinstalls the readline callback handler, if the |
3776 | target is running in the background. If while handling the target | |
3777 | event something triggered a secondary prompt, like e.g., a | |
3778 | pagination prompt, we'll have removed the callback handler (see | |
3779 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3780 | event loop, ready to process further input. Note this has no | |
3781 | effect if the handler hasn't actually been removed, because calling | |
3782 | rl_callback_handler_install resets the line buffer, thus losing | |
3783 | input. */ | |
3784 | ||
3785 | static void | |
d238133d | 3786 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 3787 | { |
3b12939d PA |
3788 | struct ui *ui = current_ui; |
3789 | ||
3790 | if (!ui->async) | |
6c400b59 PA |
3791 | { |
3792 | /* We're not going back to the top level event loop yet. Don't | |
3793 | install the readline callback, as it'd prep the terminal, | |
3794 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3795 | it the next time the prompt is displayed, when we're ready | |
3796 | for input. */ | |
3797 | return; | |
3798 | } | |
3799 | ||
3b12939d | 3800 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3801 | gdb_rl_callback_handler_reinstall (); |
3802 | } | |
3803 | ||
243a9253 PA |
3804 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3805 | that's just the event thread. In all-stop, that's all threads. */ | |
3806 | ||
3807 | static void | |
3808 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3809 | { | |
08036331 PA |
3810 | if (ecs->event_thread != NULL |
3811 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 3812 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
3813 | |
3814 | if (!non_stop) | |
3815 | { | |
08036331 | 3816 | for (thread_info *thr : all_non_exited_threads ()) |
243a9253 PA |
3817 | { |
3818 | if (thr->thread_fsm == NULL) | |
3819 | continue; | |
3820 | if (thr == ecs->event_thread) | |
3821 | continue; | |
3822 | ||
00431a78 | 3823 | switch_to_thread (thr); |
46e3ed7f | 3824 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
3825 | } |
3826 | ||
3827 | if (ecs->event_thread != NULL) | |
00431a78 | 3828 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3829 | } |
3830 | } | |
3831 | ||
3b12939d PA |
3832 | /* Helper for all_uis_check_sync_execution_done that works on the |
3833 | current UI. */ | |
3834 | ||
3835 | static void | |
3836 | check_curr_ui_sync_execution_done (void) | |
3837 | { | |
3838 | struct ui *ui = current_ui; | |
3839 | ||
3840 | if (ui->prompt_state == PROMPT_NEEDED | |
3841 | && ui->async | |
3842 | && !gdb_in_secondary_prompt_p (ui)) | |
3843 | { | |
223ffa71 | 3844 | target_terminal::ours (); |
76727919 | 3845 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3846 | ui_register_input_event_handler (ui); |
3b12939d PA |
3847 | } |
3848 | } | |
3849 | ||
3850 | /* See infrun.h. */ | |
3851 | ||
3852 | void | |
3853 | all_uis_check_sync_execution_done (void) | |
3854 | { | |
0e454242 | 3855 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3856 | { |
3857 | check_curr_ui_sync_execution_done (); | |
3858 | } | |
3859 | } | |
3860 | ||
a8836c93 PA |
3861 | /* See infrun.h. */ |
3862 | ||
3863 | void | |
3864 | all_uis_on_sync_execution_starting (void) | |
3865 | { | |
0e454242 | 3866 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3867 | { |
3868 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3869 | async_disable_stdin (); | |
3870 | } | |
3871 | } | |
3872 | ||
1777feb0 | 3873 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3874 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3875 | descriptor corresponding to the target. It can be called more than |
3876 | once to complete a single execution command. In such cases we need | |
3877 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3878 | that this function is called for a single execution command, then |
3879 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3880 | necessary cleanups. */ |
43ff13b4 JM |
3881 | |
3882 | void | |
fba45db2 | 3883 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3884 | { |
0d1e5fa7 | 3885 | struct execution_control_state ecss; |
a474d7c2 | 3886 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 3887 | int cmd_done = 0; |
43ff13b4 | 3888 | |
0d1e5fa7 PA |
3889 | memset (ecs, 0, sizeof (*ecs)); |
3890 | ||
c61db772 PA |
3891 | /* Events are always processed with the main UI as current UI. This |
3892 | way, warnings, debug output, etc. are always consistently sent to | |
3893 | the main console. */ | |
4b6749b9 | 3894 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3895 | |
d3d4baed | 3896 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
3897 | { |
3898 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
3899 | ||
3900 | /* We're handling a live event, so make sure we're doing live | |
3901 | debugging. If we're looking at traceframes while the target is | |
3902 | running, we're going to need to get back to that mode after | |
3903 | handling the event. */ | |
3904 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
3905 | if (non_stop) | |
3906 | { | |
3907 | maybe_restore_traceframe.emplace (); | |
3908 | set_current_traceframe (-1); | |
3909 | } | |
43ff13b4 | 3910 | |
873657b9 PA |
3911 | /* The user/frontend should not notice a thread switch due to |
3912 | internal events. Make sure we revert to the user selected | |
3913 | thread and frame after handling the event and running any | |
3914 | breakpoint commands. */ | |
3915 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
3916 | |
3917 | overlay_cache_invalid = 1; | |
3918 | /* Flush target cache before starting to handle each event. Target | |
3919 | was running and cache could be stale. This is just a heuristic. | |
3920 | Running threads may modify target memory, but we don't get any | |
3921 | event. */ | |
3922 | target_dcache_invalidate (); | |
3923 | ||
3924 | scoped_restore save_exec_dir | |
3925 | = make_scoped_restore (&execution_direction, | |
3926 | target_execution_direction ()); | |
3927 | ||
5b6d1e4f PA |
3928 | if (!do_target_wait (minus_one_ptid, ecs, TARGET_WNOHANG)) |
3929 | return; | |
3930 | ||
3931 | gdb_assert (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3932 | ||
3933 | /* Switch to the target that generated the event, so we can do | |
3934 | target calls. Any inferior bound to the target will do, so we | |
3935 | just switch to the first we find. */ | |
3936 | for (inferior *inf : all_inferiors (ecs->target)) | |
3937 | { | |
3938 | switch_to_inferior_no_thread (inf); | |
3939 | break; | |
3940 | } | |
d238133d TT |
3941 | |
3942 | if (debug_infrun) | |
5b6d1e4f | 3943 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
d238133d TT |
3944 | |
3945 | /* If an error happens while handling the event, propagate GDB's | |
3946 | knowledge of the executing state to the frontend/user running | |
3947 | state. */ | |
3948 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 3949 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 3950 | |
979a0d13 | 3951 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
3952 | still for the thread which has thrown the exception. */ |
3953 | auto defer_bpstat_clear | |
3954 | = make_scope_exit (bpstat_clear_actions); | |
3955 | auto defer_delete_threads | |
3956 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
3957 | ||
3958 | /* Now figure out what to do with the result of the result. */ | |
3959 | handle_inferior_event (ecs); | |
3960 | ||
3961 | if (!ecs->wait_some_more) | |
3962 | { | |
5b6d1e4f | 3963 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
d238133d TT |
3964 | int should_stop = 1; |
3965 | struct thread_info *thr = ecs->event_thread; | |
d6b48e9c | 3966 | |
d238133d | 3967 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3968 | |
d238133d TT |
3969 | if (thr != NULL) |
3970 | { | |
3971 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 3972 | |
d238133d | 3973 | if (thread_fsm != NULL) |
46e3ed7f | 3974 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 3975 | } |
243a9253 | 3976 | |
d238133d TT |
3977 | if (!should_stop) |
3978 | { | |
3979 | keep_going (ecs); | |
3980 | } | |
3981 | else | |
3982 | { | |
46e3ed7f | 3983 | bool should_notify_stop = true; |
d238133d | 3984 | int proceeded = 0; |
1840d81a | 3985 | |
d238133d | 3986 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 3987 | |
d238133d | 3988 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 3989 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 3990 | |
d238133d TT |
3991 | if (should_notify_stop) |
3992 | { | |
3993 | /* We may not find an inferior if this was a process exit. */ | |
3994 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
3995 | proceeded = normal_stop (); | |
3996 | } | |
243a9253 | 3997 | |
d238133d TT |
3998 | if (!proceeded) |
3999 | { | |
4000 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
4001 | cmd_done = 1; | |
4002 | } | |
873657b9 PA |
4003 | |
4004 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
4005 | previously selected thread is gone. We have two | |
4006 | choices - switch to no thread selected, or restore the | |
4007 | previously selected thread (now exited). We chose the | |
4008 | later, just because that's what GDB used to do. After | |
4009 | this, "info threads" says "The current thread <Thread | |
4010 | ID 2> has terminated." instead of "No thread | |
4011 | selected.". */ | |
4012 | if (!non_stop | |
4013 | && cmd_done | |
4014 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
4015 | restore_thread.dont_restore (); | |
d238133d TT |
4016 | } |
4017 | } | |
4f8d22e3 | 4018 | |
d238133d TT |
4019 | defer_delete_threads.release (); |
4020 | defer_bpstat_clear.release (); | |
29f49a6a | 4021 | |
d238133d TT |
4022 | /* No error, don't finish the thread states yet. */ |
4023 | finish_state.release (); | |
731f534f | 4024 | |
d238133d TT |
4025 | /* This scope is used to ensure that readline callbacks are |
4026 | reinstalled here. */ | |
4027 | } | |
4f8d22e3 | 4028 | |
3b12939d PA |
4029 | /* If a UI was in sync execution mode, and now isn't, restore its |
4030 | prompt (a synchronous execution command has finished, and we're | |
4031 | ready for input). */ | |
4032 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4033 | |
4034 | if (cmd_done | |
0f641c01 | 4035 | && exec_done_display_p |
00431a78 PA |
4036 | && (inferior_ptid == null_ptid |
4037 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 4038 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
4039 | } |
4040 | ||
29734269 SM |
4041 | /* See infrun.h. */ |
4042 | ||
edb3359d | 4043 | void |
29734269 SM |
4044 | set_step_info (thread_info *tp, struct frame_info *frame, |
4045 | struct symtab_and_line sal) | |
edb3359d | 4046 | { |
29734269 SM |
4047 | /* This can be removed once this function no longer implicitly relies on the |
4048 | inferior_ptid value. */ | |
4049 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4050 | |
16c381f0 JK |
4051 | tp->control.step_frame_id = get_frame_id (frame); |
4052 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4053 | |
4054 | tp->current_symtab = sal.symtab; | |
4055 | tp->current_line = sal.line; | |
4056 | } | |
4057 | ||
0d1e5fa7 PA |
4058 | /* Clear context switchable stepping state. */ |
4059 | ||
4060 | void | |
4e1c45ea | 4061 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4062 | { |
7f5ef605 | 4063 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4064 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4065 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4066 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4067 | } |
4068 | ||
ab1ddbcf | 4069 | /* See infrun.h. */ |
c32c64b7 | 4070 | |
6efcd9a8 | 4071 | void |
5b6d1e4f PA |
4072 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
4073 | target_waitstatus status) | |
c32c64b7 | 4074 | { |
5b6d1e4f | 4075 | target_last_proc_target = target; |
c32c64b7 DE |
4076 | target_last_wait_ptid = ptid; |
4077 | target_last_waitstatus = status; | |
4078 | } | |
4079 | ||
ab1ddbcf | 4080 | /* See infrun.h. */ |
e02bc4cc DS |
4081 | |
4082 | void | |
5b6d1e4f PA |
4083 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4084 | target_waitstatus *status) | |
e02bc4cc | 4085 | { |
5b6d1e4f PA |
4086 | if (target != nullptr) |
4087 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4088 | if (ptid != nullptr) |
4089 | *ptid = target_last_wait_ptid; | |
4090 | if (status != nullptr) | |
4091 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4092 | } |
4093 | ||
ab1ddbcf PA |
4094 | /* See infrun.h. */ |
4095 | ||
ac264b3b MS |
4096 | void |
4097 | nullify_last_target_wait_ptid (void) | |
4098 | { | |
5b6d1e4f | 4099 | target_last_proc_target = nullptr; |
ac264b3b | 4100 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4101 | target_last_waitstatus = {}; |
ac264b3b MS |
4102 | } |
4103 | ||
dcf4fbde | 4104 | /* Switch thread contexts. */ |
dd80620e MS |
4105 | |
4106 | static void | |
00431a78 | 4107 | context_switch (execution_control_state *ecs) |
dd80620e | 4108 | { |
4100594e | 4109 | if (ecs->ptid != inferior_ptid |
5b6d1e4f PA |
4110 | && (inferior_ptid == null_ptid |
4111 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 | 4112 | { |
4100594e SM |
4113 | infrun_log_debug ("Switching context from %s to %s", |
4114 | target_pid_to_str (inferior_ptid).c_str (), | |
4115 | target_pid_to_str (ecs->ptid).c_str ()); | |
fd48f117 DJ |
4116 | } |
4117 | ||
00431a78 | 4118 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4119 | } |
4120 | ||
d8dd4d5f PA |
4121 | /* If the target can't tell whether we've hit breakpoints |
4122 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4123 | check whether that could have been caused by a breakpoint. If so, | |
4124 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4125 | ||
4fa8626c | 4126 | static void |
d8dd4d5f PA |
4127 | adjust_pc_after_break (struct thread_info *thread, |
4128 | struct target_waitstatus *ws) | |
4fa8626c | 4129 | { |
24a73cce UW |
4130 | struct regcache *regcache; |
4131 | struct gdbarch *gdbarch; | |
118e6252 | 4132 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4133 | |
4fa8626c DJ |
4134 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4135 | we aren't, just return. | |
9709f61c DJ |
4136 | |
4137 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4138 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4139 | implemented by software breakpoints should be handled through the normal | |
4140 | breakpoint layer. | |
8fb3e588 | 4141 | |
4fa8626c DJ |
4142 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4143 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4144 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4145 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4146 | generates these signals at breakpoints (the code has been in GDB since at | |
4147 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4148 | |
e6cf7916 UW |
4149 | In earlier versions of GDB, a target with |
4150 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4151 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4152 | target with both of these set in GDB history, and it seems unlikely to be | |
4153 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4154 | |
d8dd4d5f | 4155 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4156 | return; |
4157 | ||
d8dd4d5f | 4158 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4159 | return; |
4160 | ||
4058b839 PA |
4161 | /* In reverse execution, when a breakpoint is hit, the instruction |
4162 | under it has already been de-executed. The reported PC always | |
4163 | points at the breakpoint address, so adjusting it further would | |
4164 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4165 | architecture: | |
4166 | ||
4167 | B1 0x08000000 : INSN1 | |
4168 | B2 0x08000001 : INSN2 | |
4169 | 0x08000002 : INSN3 | |
4170 | PC -> 0x08000003 : INSN4 | |
4171 | ||
4172 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4173 | from that point should hit B2 as below. Reading the PC when the | |
4174 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4175 | been de-executed already. | |
4176 | ||
4177 | B1 0x08000000 : INSN1 | |
4178 | B2 PC -> 0x08000001 : INSN2 | |
4179 | 0x08000002 : INSN3 | |
4180 | 0x08000003 : INSN4 | |
4181 | ||
4182 | We can't apply the same logic as for forward execution, because | |
4183 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4184 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4185 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4186 | behaviour. */ | |
4187 | if (execution_direction == EXEC_REVERSE) | |
4188 | return; | |
4189 | ||
1cf4d951 PA |
4190 | /* If the target can tell whether the thread hit a SW breakpoint, |
4191 | trust it. Targets that can tell also adjust the PC | |
4192 | themselves. */ | |
4193 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4194 | return; | |
4195 | ||
4196 | /* Note that relying on whether a breakpoint is planted in memory to | |
4197 | determine this can fail. E.g,. the breakpoint could have been | |
4198 | removed since. Or the thread could have been told to step an | |
4199 | instruction the size of a breakpoint instruction, and only | |
4200 | _after_ was a breakpoint inserted at its address. */ | |
4201 | ||
24a73cce UW |
4202 | /* If this target does not decrement the PC after breakpoints, then |
4203 | we have nothing to do. */ | |
00431a78 | 4204 | regcache = get_thread_regcache (thread); |
ac7936df | 4205 | gdbarch = regcache->arch (); |
118e6252 | 4206 | |
527a273a | 4207 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4208 | if (decr_pc == 0) |
24a73cce UW |
4209 | return; |
4210 | ||
8b86c959 | 4211 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4212 | |
8aad930b AC |
4213 | /* Find the location where (if we've hit a breakpoint) the |
4214 | breakpoint would be. */ | |
118e6252 | 4215 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4216 | |
1cf4d951 PA |
4217 | /* If the target can't tell whether a software breakpoint triggered, |
4218 | fallback to figuring it out based on breakpoints we think were | |
4219 | inserted in the target, and on whether the thread was stepped or | |
4220 | continued. */ | |
4221 | ||
1c5cfe86 PA |
4222 | /* Check whether there actually is a software breakpoint inserted at |
4223 | that location. | |
4224 | ||
4225 | If in non-stop mode, a race condition is possible where we've | |
4226 | removed a breakpoint, but stop events for that breakpoint were | |
4227 | already queued and arrive later. To suppress those spurious | |
4228 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4229 | and retire them after a number of stop events are reported. Note |
4230 | this is an heuristic and can thus get confused. The real fix is | |
4231 | to get the "stopped by SW BP and needs adjustment" info out of | |
4232 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4233 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4234 | || (target_is_non_stop_p () |
4235 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4236 | { |
07036511 | 4237 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4238 | |
8213266a | 4239 | if (record_full_is_used ()) |
07036511 TT |
4240 | restore_operation_disable.emplace |
4241 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4242 | |
1c0fdd0e UW |
4243 | /* When using hardware single-step, a SIGTRAP is reported for both |
4244 | a completed single-step and a software breakpoint. Need to | |
4245 | differentiate between the two, as the latter needs adjusting | |
4246 | but the former does not. | |
4247 | ||
4248 | The SIGTRAP can be due to a completed hardware single-step only if | |
4249 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4250 | - this thread is currently being stepped |
4251 | ||
4252 | If any of these events did not occur, we must have stopped due | |
4253 | to hitting a software breakpoint, and have to back up to the | |
4254 | breakpoint address. | |
4255 | ||
4256 | As a special case, we could have hardware single-stepped a | |
4257 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4258 | we also need to back up to the breakpoint address. */ | |
4259 | ||
d8dd4d5f PA |
4260 | if (thread_has_single_step_breakpoints_set (thread) |
4261 | || !currently_stepping (thread) | |
4262 | || (thread->stepped_breakpoint | |
4263 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4264 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4265 | } |
4fa8626c DJ |
4266 | } |
4267 | ||
edb3359d DJ |
4268 | static int |
4269 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4270 | { | |
4271 | for (frame = get_prev_frame (frame); | |
4272 | frame != NULL; | |
4273 | frame = get_prev_frame (frame)) | |
4274 | { | |
4275 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4276 | return 1; | |
4277 | if (get_frame_type (frame) != INLINE_FRAME) | |
4278 | break; | |
4279 | } | |
4280 | ||
4281 | return 0; | |
4282 | } | |
4283 | ||
4a4c04f1 BE |
4284 | /* Look for an inline frame that is marked for skip. |
4285 | If PREV_FRAME is TRUE start at the previous frame, | |
4286 | otherwise start at the current frame. Stop at the | |
4287 | first non-inline frame, or at the frame where the | |
4288 | step started. */ | |
4289 | ||
4290 | static bool | |
4291 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4292 | { | |
4293 | struct frame_info *frame = get_current_frame (); | |
4294 | ||
4295 | if (prev_frame) | |
4296 | frame = get_prev_frame (frame); | |
4297 | ||
4298 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4299 | { | |
4300 | const char *fn = NULL; | |
4301 | symtab_and_line sal; | |
4302 | struct symbol *sym; | |
4303 | ||
4304 | if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id)) | |
4305 | break; | |
4306 | if (get_frame_type (frame) != INLINE_FRAME) | |
4307 | break; | |
4308 | ||
4309 | sal = find_frame_sal (frame); | |
4310 | sym = get_frame_function (frame); | |
4311 | ||
4312 | if (sym != NULL) | |
4313 | fn = sym->print_name (); | |
4314 | ||
4315 | if (sal.line != 0 | |
4316 | && function_name_is_marked_for_skip (fn, sal)) | |
4317 | return true; | |
4318 | } | |
4319 | ||
4320 | return false; | |
4321 | } | |
4322 | ||
c65d6b55 PA |
4323 | /* If the event thread has the stop requested flag set, pretend it |
4324 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4325 | target_stop). */ | |
4326 | ||
4327 | static bool | |
4328 | handle_stop_requested (struct execution_control_state *ecs) | |
4329 | { | |
4330 | if (ecs->event_thread->stop_requested) | |
4331 | { | |
4332 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4333 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4334 | handle_signal_stop (ecs); | |
4335 | return true; | |
4336 | } | |
4337 | return false; | |
4338 | } | |
4339 | ||
a96d9b2e SDJ |
4340 | /* Auxiliary function that handles syscall entry/return events. |
4341 | It returns 1 if the inferior should keep going (and GDB | |
4342 | should ignore the event), or 0 if the event deserves to be | |
4343 | processed. */ | |
ca2163eb | 4344 | |
a96d9b2e | 4345 | static int |
ca2163eb | 4346 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4347 | { |
ca2163eb | 4348 | struct regcache *regcache; |
ca2163eb PA |
4349 | int syscall_number; |
4350 | ||
00431a78 | 4351 | context_switch (ecs); |
ca2163eb | 4352 | |
00431a78 | 4353 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4354 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4355 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4356 | |
a96d9b2e SDJ |
4357 | if (catch_syscall_enabled () > 0 |
4358 | && catching_syscall_number (syscall_number) > 0) | |
4359 | { | |
4100594e | 4360 | infrun_log_debug ("syscall number=%d", syscall_number); |
a96d9b2e | 4361 | |
16c381f0 | 4362 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4363 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4364 | ecs->event_thread->suspend.stop_pc, |
4365 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4366 | |
c65d6b55 PA |
4367 | if (handle_stop_requested (ecs)) |
4368 | return 0; | |
4369 | ||
ce12b012 | 4370 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4371 | { |
4372 | /* Catchpoint hit. */ | |
ca2163eb PA |
4373 | return 0; |
4374 | } | |
a96d9b2e | 4375 | } |
ca2163eb | 4376 | |
c65d6b55 PA |
4377 | if (handle_stop_requested (ecs)) |
4378 | return 0; | |
4379 | ||
ca2163eb | 4380 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb PA |
4381 | keep_going (ecs); |
4382 | return 1; | |
a96d9b2e SDJ |
4383 | } |
4384 | ||
7e324e48 GB |
4385 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4386 | ||
4387 | static void | |
4388 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4389 | struct execution_control_state *ecs) | |
4390 | { | |
4391 | if (!ecs->stop_func_filled_in) | |
4392 | { | |
98a617f8 KB |
4393 | const block *block; |
4394 | ||
7e324e48 GB |
4395 | /* Don't care about return value; stop_func_start and stop_func_name |
4396 | will both be 0 if it doesn't work. */ | |
98a617f8 KB |
4397 | find_pc_partial_function (ecs->event_thread->suspend.stop_pc, |
4398 | &ecs->stop_func_name, | |
4399 | &ecs->stop_func_start, | |
4400 | &ecs->stop_func_end, | |
4401 | &block); | |
4402 | ||
4403 | /* The call to find_pc_partial_function, above, will set | |
4404 | stop_func_start and stop_func_end to the start and end | |
4405 | of the range containing the stop pc. If this range | |
4406 | contains the entry pc for the block (which is always the | |
4407 | case for contiguous blocks), advance stop_func_start past | |
4408 | the function's start offset and entrypoint. Note that | |
4409 | stop_func_start is NOT advanced when in a range of a | |
4410 | non-contiguous block that does not contain the entry pc. */ | |
4411 | if (block != nullptr | |
4412 | && ecs->stop_func_start <= BLOCK_ENTRY_PC (block) | |
4413 | && BLOCK_ENTRY_PC (block) < ecs->stop_func_end) | |
4414 | { | |
4415 | ecs->stop_func_start | |
4416 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4417 | ||
4418 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4419 | ecs->stop_func_start | |
4420 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4421 | } | |
591a12a1 | 4422 | |
7e324e48 GB |
4423 | ecs->stop_func_filled_in = 1; |
4424 | } | |
4425 | } | |
4426 | ||
4f5d7f63 | 4427 | |
00431a78 | 4428 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4429 | |
4430 | static enum stop_kind | |
00431a78 | 4431 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4432 | { |
5b6d1e4f | 4433 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4434 | |
4435 | gdb_assert (inf != NULL); | |
4436 | return inf->control.stop_soon; | |
4437 | } | |
4438 | ||
5b6d1e4f PA |
4439 | /* Poll for one event out of the current target. Store the resulting |
4440 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4441 | |
4442 | static ptid_t | |
5b6d1e4f | 4443 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4444 | { |
4445 | ptid_t event_ptid; | |
372316f1 PA |
4446 | |
4447 | overlay_cache_invalid = 1; | |
4448 | ||
4449 | /* Flush target cache before starting to handle each event. | |
4450 | Target was running and cache could be stale. This is just a | |
4451 | heuristic. Running threads may modify target memory, but we | |
4452 | don't get any event. */ | |
4453 | target_dcache_invalidate (); | |
4454 | ||
4455 | if (deprecated_target_wait_hook) | |
5b6d1e4f | 4456 | event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 | 4457 | else |
5b6d1e4f | 4458 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4459 | |
4460 | if (debug_infrun) | |
5b6d1e4f | 4461 | print_target_wait_results (minus_one_ptid, event_ptid, ws); |
372316f1 PA |
4462 | |
4463 | return event_ptid; | |
4464 | } | |
4465 | ||
5b6d1e4f PA |
4466 | /* An event reported by wait_one. */ |
4467 | ||
4468 | struct wait_one_event | |
4469 | { | |
4470 | /* The target the event came out of. */ | |
4471 | process_stratum_target *target; | |
4472 | ||
4473 | /* The PTID the event was for. */ | |
4474 | ptid_t ptid; | |
4475 | ||
4476 | /* The waitstatus. */ | |
4477 | target_waitstatus ws; | |
4478 | }; | |
4479 | ||
4480 | /* Wait for one event out of any target. */ | |
4481 | ||
4482 | static wait_one_event | |
4483 | wait_one () | |
4484 | { | |
4485 | while (1) | |
4486 | { | |
4487 | for (inferior *inf : all_inferiors ()) | |
4488 | { | |
4489 | process_stratum_target *target = inf->process_target (); | |
4490 | if (target == NULL | |
4491 | || !target->is_async_p () | |
4492 | || !target->threads_executing) | |
4493 | continue; | |
4494 | ||
4495 | switch_to_inferior_no_thread (inf); | |
4496 | ||
4497 | wait_one_event event; | |
4498 | event.target = target; | |
4499 | event.ptid = poll_one_curr_target (&event.ws); | |
4500 | ||
4501 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4502 | { | |
4503 | /* If nothing is resumed, remove the target from the | |
4504 | event loop. */ | |
4505 | target_async (0); | |
4506 | } | |
4507 | else if (event.ws.kind != TARGET_WAITKIND_IGNORE) | |
4508 | return event; | |
4509 | } | |
4510 | ||
4511 | /* Block waiting for some event. */ | |
4512 | ||
4513 | fd_set readfds; | |
4514 | int nfds = 0; | |
4515 | ||
4516 | FD_ZERO (&readfds); | |
4517 | ||
4518 | for (inferior *inf : all_inferiors ()) | |
4519 | { | |
4520 | process_stratum_target *target = inf->process_target (); | |
4521 | if (target == NULL | |
4522 | || !target->is_async_p () | |
4523 | || !target->threads_executing) | |
4524 | continue; | |
4525 | ||
4526 | int fd = target->async_wait_fd (); | |
4527 | FD_SET (fd, &readfds); | |
4528 | if (nfds <= fd) | |
4529 | nfds = fd + 1; | |
4530 | } | |
4531 | ||
4532 | if (nfds == 0) | |
4533 | { | |
4534 | /* No waitable targets left. All must be stopped. */ | |
4535 | return {NULL, minus_one_ptid, {TARGET_WAITKIND_NO_RESUMED}}; | |
4536 | } | |
4537 | ||
4538 | QUIT; | |
4539 | ||
4540 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4541 | if (numfds < 0) | |
4542 | { | |
4543 | if (errno == EINTR) | |
4544 | continue; | |
4545 | else | |
4546 | perror_with_name ("interruptible_select"); | |
4547 | } | |
4548 | } | |
4549 | } | |
4550 | ||
372316f1 PA |
4551 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID |
4552 | instead of the current thread. */ | |
4553 | #define THREAD_STOPPED_BY(REASON) \ | |
4554 | static int \ | |
4555 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4556 | { \ | |
2989a365 | 4557 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); \ |
372316f1 PA |
4558 | inferior_ptid = ptid; \ |
4559 | \ | |
2989a365 | 4560 | return target_stopped_by_ ## REASON (); \ |
372316f1 PA |
4561 | } |
4562 | ||
4563 | /* Generate thread_stopped_by_watchpoint. */ | |
4564 | THREAD_STOPPED_BY (watchpoint) | |
4565 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4566 | THREAD_STOPPED_BY (sw_breakpoint) | |
4567 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4568 | THREAD_STOPPED_BY (hw_breakpoint) | |
4569 | ||
372316f1 PA |
4570 | /* Save the thread's event and stop reason to process it later. */ |
4571 | ||
4572 | static void | |
5b6d1e4f | 4573 | save_waitstatus (struct thread_info *tp, const target_waitstatus *ws) |
372316f1 | 4574 | { |
4100594e SM |
4575 | infrun_log_debug ("saving status %s for %d.%ld.%ld", |
4576 | target_waitstatus_to_string (ws).c_str (), | |
4577 | tp->ptid.pid (), | |
4578 | tp->ptid.lwp (), | |
4579 | tp->ptid.tid ()); | |
372316f1 PA |
4580 | |
4581 | /* Record for later. */ | |
4582 | tp->suspend.waitstatus = *ws; | |
4583 | tp->suspend.waitstatus_pending_p = 1; | |
4584 | ||
00431a78 | 4585 | struct regcache *regcache = get_thread_regcache (tp); |
8b86c959 | 4586 | const address_space *aspace = regcache->aspace (); |
372316f1 PA |
4587 | |
4588 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4589 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4590 | { | |
4591 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4592 | ||
4593 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4594 | ||
4595 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4596 | { | |
4597 | tp->suspend.stop_reason | |
4598 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4599 | } | |
4600 | else if (target_supports_stopped_by_sw_breakpoint () | |
4601 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4602 | { | |
4603 | tp->suspend.stop_reason | |
4604 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4605 | } | |
4606 | else if (target_supports_stopped_by_hw_breakpoint () | |
4607 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4608 | { | |
4609 | tp->suspend.stop_reason | |
4610 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4611 | } | |
4612 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4613 | && hardware_breakpoint_inserted_here_p (aspace, | |
4614 | pc)) | |
4615 | { | |
4616 | tp->suspend.stop_reason | |
4617 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4618 | } | |
4619 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4620 | && software_breakpoint_inserted_here_p (aspace, | |
4621 | pc)) | |
4622 | { | |
4623 | tp->suspend.stop_reason | |
4624 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4625 | } | |
4626 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4627 | && currently_stepping (tp)) | |
4628 | { | |
4629 | tp->suspend.stop_reason | |
4630 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4631 | } | |
4632 | } | |
4633 | } | |
4634 | ||
293b3ebc TBA |
4635 | /* Mark the non-executing threads accordingly. In all-stop, all |
4636 | threads of all processes are stopped when we get any event | |
4637 | reported. In non-stop mode, only the event thread stops. */ | |
4638 | ||
4639 | static void | |
4640 | mark_non_executing_threads (process_stratum_target *target, | |
4641 | ptid_t event_ptid, | |
4642 | struct target_waitstatus ws) | |
4643 | { | |
4644 | ptid_t mark_ptid; | |
4645 | ||
4646 | if (!target_is_non_stop_p ()) | |
4647 | mark_ptid = minus_one_ptid; | |
4648 | else if (ws.kind == TARGET_WAITKIND_SIGNALLED | |
4649 | || ws.kind == TARGET_WAITKIND_EXITED) | |
4650 | { | |
4651 | /* If we're handling a process exit in non-stop mode, even | |
4652 | though threads haven't been deleted yet, one would think | |
4653 | that there is nothing to do, as threads of the dead process | |
4654 | will be soon deleted, and threads of any other process were | |
4655 | left running. However, on some targets, threads survive a | |
4656 | process exit event. E.g., for the "checkpoint" command, | |
4657 | when the current checkpoint/fork exits, linux-fork.c | |
4658 | automatically switches to another fork from within | |
4659 | target_mourn_inferior, by associating the same | |
4660 | inferior/thread to another fork. We haven't mourned yet at | |
4661 | this point, but we must mark any threads left in the | |
4662 | process as not-executing so that finish_thread_state marks | |
4663 | them stopped (in the user's perspective) if/when we present | |
4664 | the stop to the user. */ | |
4665 | mark_ptid = ptid_t (event_ptid.pid ()); | |
4666 | } | |
4667 | else | |
4668 | mark_ptid = event_ptid; | |
4669 | ||
4670 | set_executing (target, mark_ptid, false); | |
4671 | ||
4672 | /* Likewise the resumed flag. */ | |
4673 | set_resumed (target, mark_ptid, false); | |
4674 | } | |
4675 | ||
6efcd9a8 | 4676 | /* See infrun.h. */ |
372316f1 | 4677 | |
6efcd9a8 | 4678 | void |
372316f1 PA |
4679 | stop_all_threads (void) |
4680 | { | |
4681 | /* We may need multiple passes to discover all threads. */ | |
4682 | int pass; | |
4683 | int iterations = 0; | |
372316f1 | 4684 | |
53cccef1 | 4685 | gdb_assert (exists_non_stop_target ()); |
372316f1 | 4686 | |
4100594e | 4687 | infrun_log_debug ("stop_all_threads"); |
372316f1 | 4688 | |
00431a78 | 4689 | scoped_restore_current_thread restore_thread; |
372316f1 | 4690 | |
6ad82919 TBA |
4691 | /* Enable thread events of all targets. */ |
4692 | for (auto *target : all_non_exited_process_targets ()) | |
4693 | { | |
4694 | switch_to_target_no_thread (target); | |
4695 | target_thread_events (true); | |
4696 | } | |
4697 | ||
4698 | SCOPE_EXIT | |
4699 | { | |
4700 | /* Disable thread events of all targets. */ | |
4701 | for (auto *target : all_non_exited_process_targets ()) | |
4702 | { | |
4703 | switch_to_target_no_thread (target); | |
4704 | target_thread_events (false); | |
4705 | } | |
4706 | ||
4100594e SM |
4707 | |
4708 | infrun_log_debug ("stop_all_threads done"); | |
6ad82919 | 4709 | }; |
65706a29 | 4710 | |
372316f1 PA |
4711 | /* Request threads to stop, and then wait for the stops. Because |
4712 | threads we already know about can spawn more threads while we're | |
4713 | trying to stop them, and we only learn about new threads when we | |
4714 | update the thread list, do this in a loop, and keep iterating | |
4715 | until two passes find no threads that need to be stopped. */ | |
4716 | for (pass = 0; pass < 2; pass++, iterations++) | |
4717 | { | |
4100594e SM |
4718 | infrun_log_debug ("stop_all_threads, pass=%d, iterations=%d", |
4719 | pass, iterations); | |
372316f1 PA |
4720 | while (1) |
4721 | { | |
29d6859f | 4722 | int waits_needed = 0; |
372316f1 | 4723 | |
a05575d3 TBA |
4724 | for (auto *target : all_non_exited_process_targets ()) |
4725 | { | |
4726 | switch_to_target_no_thread (target); | |
4727 | update_thread_list (); | |
4728 | } | |
372316f1 PA |
4729 | |
4730 | /* Go through all threads looking for threads that we need | |
4731 | to tell the target to stop. */ | |
08036331 | 4732 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 4733 | { |
53cccef1 TBA |
4734 | /* For a single-target setting with an all-stop target, |
4735 | we would not even arrive here. For a multi-target | |
4736 | setting, until GDB is able to handle a mixture of | |
4737 | all-stop and non-stop targets, simply skip all-stop | |
4738 | targets' threads. This should be fine due to the | |
4739 | protection of 'check_multi_target_resumption'. */ | |
4740 | ||
4741 | switch_to_thread_no_regs (t); | |
4742 | if (!target_is_non_stop_p ()) | |
4743 | continue; | |
4744 | ||
372316f1 PA |
4745 | if (t->executing) |
4746 | { | |
4747 | /* If already stopping, don't request a stop again. | |
4748 | We just haven't seen the notification yet. */ | |
4749 | if (!t->stop_requested) | |
4750 | { | |
4100594e SM |
4751 | infrun_log_debug (" %s executing, need stop", |
4752 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4753 | target_stop (t->ptid); |
4754 | t->stop_requested = 1; | |
4755 | } | |
4756 | else | |
4757 | { | |
4100594e SM |
4758 | infrun_log_debug (" %s executing, already stopping", |
4759 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4760 | } |
4761 | ||
4762 | if (t->stop_requested) | |
29d6859f | 4763 | waits_needed++; |
372316f1 PA |
4764 | } |
4765 | else | |
4766 | { | |
4100594e SM |
4767 | infrun_log_debug (" %s not executing", |
4768 | target_pid_to_str (t->ptid).c_str ()); | |
372316f1 PA |
4769 | |
4770 | /* The thread may be not executing, but still be | |
4771 | resumed with a pending status to process. */ | |
719546c4 | 4772 | t->resumed = false; |
372316f1 PA |
4773 | } |
4774 | } | |
4775 | ||
29d6859f | 4776 | if (waits_needed == 0) |
372316f1 PA |
4777 | break; |
4778 | ||
4779 | /* If we find new threads on the second iteration, restart | |
4780 | over. We want to see two iterations in a row with all | |
4781 | threads stopped. */ | |
4782 | if (pass > 0) | |
4783 | pass = -1; | |
4784 | ||
29d6859f | 4785 | for (int i = 0; i < waits_needed; i++) |
c29705b7 | 4786 | { |
29d6859f | 4787 | wait_one_event event = wait_one (); |
a05575d3 | 4788 | |
4100594e SM |
4789 | infrun_log_debug ("%s %s\n", |
4790 | target_waitstatus_to_string (&event.ws).c_str (), | |
4791 | target_pid_to_str (event.ptid).c_str ()); | |
a05575d3 | 4792 | |
29d6859f | 4793 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) |
a05575d3 | 4794 | { |
29d6859f LM |
4795 | /* All resumed threads exited. */ |
4796 | break; | |
a05575d3 | 4797 | } |
29d6859f LM |
4798 | else if (event.ws.kind == TARGET_WAITKIND_THREAD_EXITED |
4799 | || event.ws.kind == TARGET_WAITKIND_EXITED | |
4800 | || event.ws.kind == TARGET_WAITKIND_SIGNALLED) | |
6efcd9a8 | 4801 | { |
29d6859f | 4802 | /* One thread/process exited/signalled. */ |
6efcd9a8 | 4803 | |
29d6859f | 4804 | thread_info *t = nullptr; |
372316f1 | 4805 | |
29d6859f LM |
4806 | /* The target may have reported just a pid. If so, try |
4807 | the first non-exited thread. */ | |
4808 | if (event.ptid.is_pid ()) | |
372316f1 | 4809 | { |
29d6859f LM |
4810 | int pid = event.ptid.pid (); |
4811 | inferior *inf = find_inferior_pid (event.target, pid); | |
4812 | for (thread_info *tp : inf->non_exited_threads ()) | |
372316f1 | 4813 | { |
29d6859f LM |
4814 | t = tp; |
4815 | break; | |
372316f1 | 4816 | } |
29d6859f LM |
4817 | |
4818 | /* If there is no available thread, the event would | |
4819 | have to be appended to a per-inferior event list, | |
4820 | which does not exist (and if it did, we'd have | |
4821 | to adjust run control command to be able to | |
4822 | resume such an inferior). We assert here instead | |
4823 | of going into an infinite loop. */ | |
4824 | gdb_assert (t != nullptr); | |
4825 | ||
4100594e SM |
4826 | infrun_log_debug ("using %s\n", |
4827 | target_pid_to_str (t->ptid).c_str ()); | |
29d6859f LM |
4828 | } |
4829 | else | |
4830 | { | |
4831 | t = find_thread_ptid (event.target, event.ptid); | |
4832 | /* Check if this is the first time we see this thread. | |
4833 | Don't bother adding if it individually exited. */ | |
4834 | if (t == nullptr | |
4835 | && event.ws.kind != TARGET_WAITKIND_THREAD_EXITED) | |
4836 | t = add_thread (event.target, event.ptid); | |
4837 | } | |
4838 | ||
4839 | if (t != nullptr) | |
4840 | { | |
4841 | /* Set the threads as non-executing to avoid | |
4842 | another stop attempt on them. */ | |
4843 | switch_to_thread_no_regs (t); | |
4844 | mark_non_executing_threads (event.target, event.ptid, | |
4845 | event.ws); | |
4846 | save_waitstatus (t, &event.ws); | |
4847 | t->stop_requested = false; | |
372316f1 PA |
4848 | } |
4849 | } | |
4850 | else | |
4851 | { | |
29d6859f LM |
4852 | thread_info *t = find_thread_ptid (event.target, event.ptid); |
4853 | if (t == NULL) | |
4854 | t = add_thread (event.target, event.ptid); | |
372316f1 | 4855 | |
29d6859f LM |
4856 | t->stop_requested = 0; |
4857 | t->executing = 0; | |
4858 | t->resumed = false; | |
4859 | t->control.may_range_step = 0; | |
4860 | ||
4861 | /* This may be the first time we see the inferior report | |
4862 | a stop. */ | |
4863 | inferior *inf = find_inferior_ptid (event.target, event.ptid); | |
4864 | if (inf->needs_setup) | |
372316f1 | 4865 | { |
29d6859f LM |
4866 | switch_to_thread_no_regs (t); |
4867 | setup_inferior (0); | |
372316f1 PA |
4868 | } |
4869 | ||
29d6859f LM |
4870 | if (event.ws.kind == TARGET_WAITKIND_STOPPED |
4871 | && event.ws.value.sig == GDB_SIGNAL_0) | |
372316f1 | 4872 | { |
29d6859f LM |
4873 | /* We caught the event that we intended to catch, so |
4874 | there's no event pending. */ | |
4875 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4876 | t->suspend.waitstatus_pending_p = 0; | |
4877 | ||
e088209c | 4878 | if (displaced_step_finish (t, GDB_SIGNAL_0) < 0) |
29d6859f LM |
4879 | { |
4880 | /* Add it back to the step-over queue. */ | |
4100594e SM |
4881 | infrun_log_debug ("displaced-step of %s " |
4882 | "canceled: adding back to the " | |
4883 | "step-over queue\n", | |
4884 | target_pid_to_str (t->ptid).c_str ()); | |
4885 | ||
29d6859f | 4886 | t->control.trap_expected = 0; |
bb88694d | 4887 | global_thread_step_over_chain_enqueue (t); |
29d6859f | 4888 | } |
372316f1 | 4889 | } |
29d6859f LM |
4890 | else |
4891 | { | |
4892 | enum gdb_signal sig; | |
4893 | struct regcache *regcache; | |
372316f1 | 4894 | |
29d6859f LM |
4895 | if (debug_infrun) |
4896 | { | |
4897 | std::string statstr = target_waitstatus_to_string (&event.ws); | |
372316f1 | 4898 | |
4100594e SM |
4899 | infrun_log_debug ("target_wait %s, saving " |
4900 | "status for %d.%ld.%ld\n", | |
4901 | statstr.c_str (), | |
4902 | t->ptid.pid (), | |
4903 | t->ptid.lwp (), | |
4904 | t->ptid.tid ()); | |
29d6859f LM |
4905 | } |
4906 | ||
4907 | /* Record for later. */ | |
4908 | save_waitstatus (t, &event.ws); | |
4909 | ||
4910 | sig = (event.ws.kind == TARGET_WAITKIND_STOPPED | |
4911 | ? event.ws.value.sig : GDB_SIGNAL_0); | |
4912 | ||
e088209c | 4913 | if (displaced_step_finish (t, sig) < 0) |
29d6859f LM |
4914 | { |
4915 | /* Add it back to the step-over queue. */ | |
4916 | t->control.trap_expected = 0; | |
bb88694d | 4917 | global_thread_step_over_chain_enqueue (t); |
29d6859f LM |
4918 | } |
4919 | ||
4920 | regcache = get_thread_regcache (t); | |
4921 | t->suspend.stop_pc = regcache_read_pc (regcache); | |
4922 | ||
4100594e SM |
4923 | infrun_log_debug ("saved stop_pc=%s for %s " |
4924 | "(currently_stepping=%d)\n", | |
4925 | paddress (target_gdbarch (), | |
4926 | t->suspend.stop_pc), | |
4927 | target_pid_to_str (t->ptid).c_str (), | |
4928 | currently_stepping (t)); | |
372316f1 PA |
4929 | } |
4930 | } | |
4931 | } | |
4932 | } | |
4933 | } | |
372316f1 PA |
4934 | } |
4935 | ||
f4836ba9 PA |
4936 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4937 | ||
4938 | static int | |
4939 | handle_no_resumed (struct execution_control_state *ecs) | |
4940 | { | |
3b12939d | 4941 | if (target_can_async_p ()) |
f4836ba9 | 4942 | { |
3b12939d | 4943 | int any_sync = 0; |
f4836ba9 | 4944 | |
2dab0c7b | 4945 | for (ui *ui : all_uis ()) |
3b12939d PA |
4946 | { |
4947 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4948 | { | |
4949 | any_sync = 1; | |
4950 | break; | |
4951 | } | |
4952 | } | |
4953 | if (!any_sync) | |
4954 | { | |
4955 | /* There were no unwaited-for children left in the target, but, | |
4956 | we're not synchronously waiting for events either. Just | |
4957 | ignore. */ | |
4958 | ||
4100594e | 4959 | infrun_log_debug ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)"); |
3b12939d PA |
4960 | prepare_to_wait (ecs); |
4961 | return 1; | |
4962 | } | |
f4836ba9 PA |
4963 | } |
4964 | ||
4965 | /* Otherwise, if we were running a synchronous execution command, we | |
4966 | may need to cancel it and give the user back the terminal. | |
4967 | ||
4968 | In non-stop mode, the target can't tell whether we've already | |
4969 | consumed previous stop events, so it can end up sending us a | |
4970 | no-resumed event like so: | |
4971 | ||
4972 | #0 - thread 1 is left stopped | |
4973 | ||
4974 | #1 - thread 2 is resumed and hits breakpoint | |
4975 | -> TARGET_WAITKIND_STOPPED | |
4976 | ||
4977 | #2 - thread 3 is resumed and exits | |
4978 | this is the last resumed thread, so | |
4979 | -> TARGET_WAITKIND_NO_RESUMED | |
4980 | ||
4981 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4982 | it. | |
4983 | ||
4984 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4985 | thread 2 is now resumed, so the event should be ignored. | |
4986 | ||
4987 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4988 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4989 | event. But it could be that the event meant that thread 2 itself | |
4990 | (or whatever other thread was the last resumed thread) exited. | |
4991 | ||
4992 | To address this we refresh the thread list and check whether we | |
4993 | have resumed threads _now_. In the example above, this removes | |
4994 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4995 | ignore this event. If we find no thread resumed, then we cancel | |
4996 | the synchronous command show "no unwaited-for " to the user. */ | |
4997 | update_thread_list (); | |
4998 | ||
5b6d1e4f | 4999 | for (thread_info *thread : all_non_exited_threads (ecs->target)) |
f4836ba9 PA |
5000 | { |
5001 | if (thread->executing | |
5002 | || thread->suspend.waitstatus_pending_p) | |
5003 | { | |
5004 | /* There were no unwaited-for children left in the target at | |
5005 | some point, but there are now. Just ignore. */ | |
4100594e SM |
5006 | infrun_log_debug ("TARGET_WAITKIND_NO_RESUMED " |
5007 | "(ignoring: found resumed)"); | |
f4836ba9 PA |
5008 | prepare_to_wait (ecs); |
5009 | return 1; | |
f4836ba9 PA |
5010 | } |
5011 | } | |
5012 | ||
5013 | /* Go ahead and report the event. */ | |
5014 | return 0; | |
5015 | } | |
5016 | ||
05ba8510 PA |
5017 | /* Given an execution control state that has been freshly filled in by |
5018 | an event from the inferior, figure out what it means and take | |
5019 | appropriate action. | |
5020 | ||
5021 | The alternatives are: | |
5022 | ||
22bcd14b | 5023 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5024 | debugger. |
5025 | ||
5026 | 2) keep_going and return; to wait for the next event (set | |
5027 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5028 | once). */ | |
c906108c | 5029 | |
ec9499be | 5030 | static void |
595915c1 | 5031 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5032 | { |
595915c1 TT |
5033 | /* Make sure that all temporary struct value objects that were |
5034 | created during the handling of the event get deleted at the | |
5035 | end. */ | |
5036 | scoped_value_mark free_values; | |
5037 | ||
d6b48e9c PA |
5038 | enum stop_kind stop_soon; |
5039 | ||
4100594e | 5040 | infrun_log_debug ("%s", target_waitstatus_to_string (&ecs->ws).c_str ()); |
c29705b7 | 5041 | |
28736962 PA |
5042 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
5043 | { | |
5044 | /* We had an event in the inferior, but we are not interested in | |
5045 | handling it at this level. The lower layers have already | |
5046 | done what needs to be done, if anything. | |
5047 | ||
5048 | One of the possible circumstances for this is when the | |
5049 | inferior produces output for the console. The inferior has | |
5050 | not stopped, and we are ignoring the event. Another possible | |
5051 | circumstance is any event which the lower level knows will be | |
5052 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5053 | prepare_to_wait (ecs); |
5054 | return; | |
5055 | } | |
5056 | ||
65706a29 PA |
5057 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
5058 | { | |
65706a29 PA |
5059 | prepare_to_wait (ecs); |
5060 | return; | |
5061 | } | |
5062 | ||
0e5bf2a8 | 5063 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5064 | && handle_no_resumed (ecs)) |
5065 | return; | |
0e5bf2a8 | 5066 | |
5b6d1e4f PA |
5067 | /* Cache the last target/ptid/waitstatus. */ |
5068 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5069 | |
ca005067 | 5070 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5071 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5072 | |
0e5bf2a8 PA |
5073 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
5074 | { | |
5075 | /* No unwaited-for children left. IOW, all resumed children | |
5076 | have exited. */ | |
0e5bf2a8 | 5077 | stop_print_frame = 0; |
22bcd14b | 5078 | stop_waiting (ecs); |
0e5bf2a8 PA |
5079 | return; |
5080 | } | |
5081 | ||
8c90c137 | 5082 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 5083 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 | 5084 | { |
5b6d1e4f | 5085 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5086 | /* If it's a new thread, add it to the thread database. */ |
5087 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5088 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5089 | |
5090 | /* Disable range stepping. If the next step request could use a | |
5091 | range, this will be end up re-enabled then. */ | |
5092 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5093 | } |
88ed393a JK |
5094 | |
5095 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 5096 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
5097 | |
5098 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5099 | reinit_frame_cache (); | |
5100 | ||
28736962 PA |
5101 | breakpoint_retire_moribund (); |
5102 | ||
2b009048 DJ |
5103 | /* First, distinguish signals caused by the debugger from signals |
5104 | that have to do with the program's own actions. Note that | |
5105 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5106 | on the operating system version. Here we detect when a SIGILL or | |
5107 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5108 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5109 | when we're trying to execute a breakpoint instruction on a | |
5110 | non-executable stack. This happens for call dummy breakpoints | |
5111 | for architectures like SPARC that place call dummies on the | |
5112 | stack. */ | |
2b009048 | 5113 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
5114 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
5115 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
5116 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 5117 | { |
00431a78 | 5118 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5119 | |
a01bda52 | 5120 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5121 | regcache_read_pc (regcache))) |
5122 | { | |
4100594e | 5123 | infrun_log_debug ("Treating signal as SIGTRAP"); |
a493e3e2 | 5124 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 5125 | } |
2b009048 DJ |
5126 | } |
5127 | ||
293b3ebc | 5128 | mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws); |
8c90c137 | 5129 | |
488f131b JB |
5130 | switch (ecs->ws.kind) |
5131 | { | |
5132 | case TARGET_WAITKIND_LOADED: | |
00431a78 | 5133 | context_switch (ecs); |
b0f4b84b DJ |
5134 | /* Ignore gracefully during startup of the inferior, as it might |
5135 | be the shell which has just loaded some objects, otherwise | |
5136 | add the symbols for the newly loaded objects. Also ignore at | |
5137 | the beginning of an attach or remote session; we will query | |
5138 | the full list of libraries once the connection is | |
5139 | established. */ | |
4f5d7f63 | 5140 | |
00431a78 | 5141 | stop_soon = get_inferior_stop_soon (ecs); |
c0236d92 | 5142 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 5143 | { |
edcc5120 TT |
5144 | struct regcache *regcache; |
5145 | ||
00431a78 | 5146 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 TT |
5147 | |
5148 | handle_solib_event (); | |
5149 | ||
5150 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 5151 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
5152 | ecs->event_thread->suspend.stop_pc, |
5153 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 5154 | |
c65d6b55 PA |
5155 | if (handle_stop_requested (ecs)) |
5156 | return; | |
5157 | ||
ce12b012 | 5158 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
5159 | { |
5160 | /* A catchpoint triggered. */ | |
94c57d6a PA |
5161 | process_event_stop_test (ecs); |
5162 | return; | |
edcc5120 | 5163 | } |
488f131b | 5164 | |
b0f4b84b DJ |
5165 | /* If requested, stop when the dynamic linker notifies |
5166 | gdb of events. This allows the user to get control | |
5167 | and place breakpoints in initializer routines for | |
5168 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 5169 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
5170 | if (stop_on_solib_events) |
5171 | { | |
55409f9d DJ |
5172 | /* Make sure we print "Stopped due to solib-event" in |
5173 | normal_stop. */ | |
5174 | stop_print_frame = 1; | |
5175 | ||
22bcd14b | 5176 | stop_waiting (ecs); |
b0f4b84b DJ |
5177 | return; |
5178 | } | |
488f131b | 5179 | } |
b0f4b84b DJ |
5180 | |
5181 | /* If we are skipping through a shell, or through shared library | |
5182 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 5183 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
5184 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
5185 | { | |
74960c60 VP |
5186 | /* Loading of shared libraries might have changed breakpoint |
5187 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 5188 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 5189 | insert_breakpoints (); |
64ce06e4 | 5190 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
5191 | prepare_to_wait (ecs); |
5192 | return; | |
5193 | } | |
5194 | ||
5c09a2c5 PA |
5195 | /* But stop if we're attaching or setting up a remote |
5196 | connection. */ | |
5197 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5198 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5199 | { | |
4100594e | 5200 | infrun_log_debug ("quietly stopped"); |
22bcd14b | 5201 | stop_waiting (ecs); |
5c09a2c5 PA |
5202 | return; |
5203 | } | |
5204 | ||
5205 | internal_error (__FILE__, __LINE__, | |
5206 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 5207 | |
488f131b | 5208 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5209 | if (handle_stop_requested (ecs)) |
5210 | return; | |
00431a78 | 5211 | context_switch (ecs); |
64ce06e4 | 5212 | resume (GDB_SIGNAL_0); |
488f131b JB |
5213 | prepare_to_wait (ecs); |
5214 | return; | |
c5aa993b | 5215 | |
65706a29 | 5216 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5217 | if (handle_stop_requested (ecs)) |
5218 | return; | |
00431a78 | 5219 | context_switch (ecs); |
65706a29 PA |
5220 | if (!switch_back_to_stepped_thread (ecs)) |
5221 | keep_going (ecs); | |
5222 | return; | |
5223 | ||
488f131b | 5224 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5225 | case TARGET_WAITKIND_SIGNALLED: |
fb66883a | 5226 | inferior_ptid = ecs->ptid; |
5b6d1e4f | 5227 | set_current_inferior (find_inferior_ptid (ecs->target, ecs->ptid)); |
6c95b8df PA |
5228 | set_current_program_space (current_inferior ()->pspace); |
5229 | handle_vfork_child_exec_or_exit (0); | |
223ffa71 | 5230 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5231 | |
0c557179 SDJ |
5232 | /* Clearing any previous state of convenience variables. */ |
5233 | clear_exit_convenience_vars (); | |
5234 | ||
940c3c06 PA |
5235 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5236 | { | |
5237 | /* Record the exit code in the convenience variable $_exitcode, so | |
5238 | that the user can inspect this again later. */ | |
5239 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5240 | (LONGEST) ecs->ws.value.integer); | |
5241 | ||
5242 | /* Also record this in the inferior itself. */ | |
5243 | current_inferior ()->has_exit_code = 1; | |
5244 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5245 | |
98eb56a4 PA |
5246 | /* Support the --return-child-result option. */ |
5247 | return_child_result_value = ecs->ws.value.integer; | |
5248 | ||
76727919 | 5249 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
5250 | } |
5251 | else | |
0c557179 | 5252 | { |
00431a78 | 5253 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5254 | |
5255 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5256 | { | |
5257 | /* Set the value of the internal variable $_exitsignal, | |
5258 | which holds the signal uncaught by the inferior. */ | |
5259 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5260 | gdbarch_gdb_signal_to_target (gdbarch, | |
5261 | ecs->ws.value.sig)); | |
5262 | } | |
5263 | else | |
5264 | { | |
5265 | /* We don't have access to the target's method used for | |
5266 | converting between signal numbers (GDB's internal | |
5267 | representation <-> target's representation). | |
5268 | Therefore, we cannot do a good job at displaying this | |
5269 | information to the user. It's better to just warn | |
5270 | her about it (if infrun debugging is enabled), and | |
5271 | give up. */ | |
4100594e SM |
5272 | infrun_log_debug ("Cannot fill $_exitsignal with the correct " |
5273 | "signal number."); | |
0c557179 SDJ |
5274 | } |
5275 | ||
76727919 | 5276 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 5277 | } |
8cf64490 | 5278 | |
488f131b | 5279 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5280 | target_mourn_inferior (inferior_ptid); |
488f131b | 5281 | stop_print_frame = 0; |
22bcd14b | 5282 | stop_waiting (ecs); |
488f131b | 5283 | return; |
c5aa993b | 5284 | |
488f131b | 5285 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5286 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5287 | /* Check whether the inferior is displaced stepping. */ |
5288 | { | |
00431a78 | 5289 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5290 | struct gdbarch *gdbarch = regcache->arch (); |
e2d96639 YQ |
5291 | |
5292 | /* If checking displaced stepping is supported, and thread | |
5293 | ecs->ptid is displaced stepping. */ | |
e088209c | 5294 | if (displaced_step_in_progress (ecs->event_thread)) |
e2d96639 YQ |
5295 | { |
5296 | struct inferior *parent_inf | |
5b6d1e4f | 5297 | = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 YQ |
5298 | struct regcache *child_regcache; |
5299 | CORE_ADDR parent_pc; | |
5300 | ||
d8d83535 SM |
5301 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) |
5302 | { | |
e088209c SM |
5303 | // struct displaced_step_inferior_state *displaced |
5304 | // = get_displaced_stepping_state (parent_inf); | |
d8d83535 SM |
5305 | |
5306 | /* Restore scratch pad for child process. */ | |
e088209c SM |
5307 | //displaced_step_restore (displaced, ecs->ws.value.related_pid); |
5308 | // FIXME: we should restore all the buffers that were currently in use | |
d8d83535 SM |
5309 | } |
5310 | ||
e2d96639 YQ |
5311 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, |
5312 | indicating that the displaced stepping of syscall instruction | |
5313 | has been done. Perform cleanup for parent process here. Note | |
5314 | that this operation also cleans up the child process for vfork, | |
5315 | because their pages are shared. */ | |
e088209c | 5316 | displaced_step_finish (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5317 | /* Start a new step-over in another thread if there's one |
5318 | that needs it. */ | |
5319 | start_step_over (); | |
e2d96639 | 5320 | |
e2d96639 YQ |
5321 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5322 | the child's PC is also within the scratchpad. Set the child's PC | |
5323 | to the parent's PC value, which has already been fixed up. | |
5324 | FIXME: we use the parent's aspace here, although we're touching | |
5325 | the child, because the child hasn't been added to the inferior | |
5326 | list yet at this point. */ | |
5327 | ||
5328 | child_regcache | |
5b6d1e4f PA |
5329 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
5330 | ecs->ws.value.related_pid, | |
e2d96639 YQ |
5331 | gdbarch, |
5332 | parent_inf->aspace); | |
5333 | /* Read PC value of parent process. */ | |
5334 | parent_pc = regcache_read_pc (regcache); | |
5335 | ||
5336 | if (debug_displaced) | |
5337 | fprintf_unfiltered (gdb_stdlog, | |
5338 | "displaced: write child pc from %s to %s\n", | |
5339 | paddress (gdbarch, | |
5340 | regcache_read_pc (child_regcache)), | |
5341 | paddress (gdbarch, parent_pc)); | |
5342 | ||
5343 | regcache_write_pc (child_regcache, parent_pc); | |
5344 | } | |
5345 | } | |
5346 | ||
00431a78 | 5347 | context_switch (ecs); |
5a2901d9 | 5348 | |
b242c3c2 PA |
5349 | /* Immediately detach breakpoints from the child before there's |
5350 | any chance of letting the user delete breakpoints from the | |
5351 | breakpoint lists. If we don't do this early, it's easy to | |
5352 | leave left over traps in the child, vis: "break foo; catch | |
5353 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5354 | the fork on the last `continue', and by that time the | |
5355 | breakpoint at "foo" is long gone from the breakpoint table. | |
5356 | If we vforked, then we don't need to unpatch here, since both | |
5357 | parent and child are sharing the same memory pages; we'll | |
5358 | need to unpatch at follow/detach time instead to be certain | |
5359 | that new breakpoints added between catchpoint hit time and | |
5360 | vfork follow are detached. */ | |
5361 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5362 | { | |
b242c3c2 PA |
5363 | /* This won't actually modify the breakpoint list, but will |
5364 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5365 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5366 | } |
5367 | ||
34b7e8a6 | 5368 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5369 | |
e58b0e63 PA |
5370 | /* In case the event is caught by a catchpoint, remember that |
5371 | the event is to be followed at the next resume of the thread, | |
5372 | and not immediately. */ | |
5373 | ecs->event_thread->pending_follow = ecs->ws; | |
5374 | ||
f2ffa92b PA |
5375 | ecs->event_thread->suspend.stop_pc |
5376 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 5377 | |
16c381f0 | 5378 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5379 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5380 | ecs->event_thread->suspend.stop_pc, |
5381 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 5382 | |
c65d6b55 PA |
5383 | if (handle_stop_requested (ecs)) |
5384 | return; | |
5385 | ||
ce12b012 PA |
5386 | /* If no catchpoint triggered for this, then keep going. Note |
5387 | that we're interested in knowing the bpstat actually causes a | |
5388 | stop, not just if it may explain the signal. Software | |
5389 | watchpoints, for example, always appear in the bpstat. */ | |
5390 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5391 | { |
5ab2fbf1 | 5392 | bool follow_child |
3e43a32a | 5393 | = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 5394 | |
a493e3e2 | 5395 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 | 5396 | |
5b6d1e4f PA |
5397 | process_stratum_target *targ |
5398 | = ecs->event_thread->inf->process_target (); | |
5399 | ||
5ab2fbf1 | 5400 | bool should_resume = follow_fork (); |
e58b0e63 | 5401 | |
5b6d1e4f PA |
5402 | /* Note that one of these may be an invalid pointer, |
5403 | depending on detach_fork. */ | |
00431a78 | 5404 | thread_info *parent = ecs->event_thread; |
5b6d1e4f PA |
5405 | thread_info *child |
5406 | = find_thread_ptid (targ, ecs->ws.value.related_pid); | |
6c95b8df | 5407 | |
a2077e25 PA |
5408 | /* At this point, the parent is marked running, and the |
5409 | child is marked stopped. */ | |
5410 | ||
5411 | /* If not resuming the parent, mark it stopped. */ | |
5412 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5413 | parent->set_running (false); |
a2077e25 PA |
5414 | |
5415 | /* If resuming the child, mark it running. */ | |
5416 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5417 | child->set_running (true); |
a2077e25 | 5418 | |
6c95b8df | 5419 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5420 | if (!detach_fork && (non_stop |
5421 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5422 | { |
5423 | if (follow_child) | |
5424 | switch_to_thread (parent); | |
5425 | else | |
5426 | switch_to_thread (child); | |
5427 | ||
5428 | ecs->event_thread = inferior_thread (); | |
5429 | ecs->ptid = inferior_ptid; | |
5430 | keep_going (ecs); | |
5431 | } | |
5432 | ||
5433 | if (follow_child) | |
5434 | switch_to_thread (child); | |
5435 | else | |
5436 | switch_to_thread (parent); | |
5437 | ||
e58b0e63 PA |
5438 | ecs->event_thread = inferior_thread (); |
5439 | ecs->ptid = inferior_ptid; | |
5440 | ||
5441 | if (should_resume) | |
5442 | keep_going (ecs); | |
5443 | else | |
22bcd14b | 5444 | stop_waiting (ecs); |
04e68871 DJ |
5445 | return; |
5446 | } | |
94c57d6a PA |
5447 | process_event_stop_test (ecs); |
5448 | return; | |
488f131b | 5449 | |
6c95b8df PA |
5450 | case TARGET_WAITKIND_VFORK_DONE: |
5451 | /* Done with the shared memory region. Re-insert breakpoints in | |
5452 | the parent, and keep going. */ | |
5453 | ||
00431a78 | 5454 | context_switch (ecs); |
6c95b8df PA |
5455 | |
5456 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5457 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5458 | |
5459 | if (handle_stop_requested (ecs)) | |
5460 | return; | |
5461 | ||
6c95b8df PA |
5462 | /* This also takes care of reinserting breakpoints in the |
5463 | previously locked inferior. */ | |
5464 | keep_going (ecs); | |
5465 | return; | |
5466 | ||
488f131b | 5467 | case TARGET_WAITKIND_EXECD: |
488f131b | 5468 | |
cbd2b4e3 PA |
5469 | /* Note we can't read registers yet (the stop_pc), because we |
5470 | don't yet know the inferior's post-exec architecture. | |
5471 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5472 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5473 | |
6c95b8df PA |
5474 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5475 | handle_vfork_child_exec_or_exit (1); | |
5476 | ||
795e548f PA |
5477 | /* This causes the eventpoints and symbol table to be reset. |
5478 | Must do this now, before trying to determine whether to | |
5479 | stop. */ | |
71b43ef8 | 5480 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5481 | |
17d8546e DB |
5482 | /* In follow_exec we may have deleted the original thread and |
5483 | created a new one. Make sure that the event thread is the | |
5484 | execd thread for that case (this is a nop otherwise). */ | |
5485 | ecs->event_thread = inferior_thread (); | |
5486 | ||
f2ffa92b PA |
5487 | ecs->event_thread->suspend.stop_pc |
5488 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5489 | |
16c381f0 | 5490 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5491 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5492 | ecs->event_thread->suspend.stop_pc, |
5493 | ecs->event_thread, &ecs->ws); | |
795e548f | 5494 | |
71b43ef8 PA |
5495 | /* Note that this may be referenced from inside |
5496 | bpstat_stop_status above, through inferior_has_execd. */ | |
5497 | xfree (ecs->ws.value.execd_pathname); | |
5498 | ecs->ws.value.execd_pathname = NULL; | |
5499 | ||
c65d6b55 PA |
5500 | if (handle_stop_requested (ecs)) |
5501 | return; | |
5502 | ||
04e68871 | 5503 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5504 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5505 | { |
a493e3e2 | 5506 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5507 | keep_going (ecs); |
5508 | return; | |
5509 | } | |
94c57d6a PA |
5510 | process_event_stop_test (ecs); |
5511 | return; | |
488f131b | 5512 | |
b4dc5ffa MK |
5513 | /* Be careful not to try to gather much state about a thread |
5514 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5515 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5516 | /* Getting the current syscall number. */ |
94c57d6a PA |
5517 | if (handle_syscall_event (ecs) == 0) |
5518 | process_event_stop_test (ecs); | |
5519 | return; | |
c906108c | 5520 | |
488f131b JB |
5521 | /* Before examining the threads further, step this thread to |
5522 | get it entirely out of the syscall. (We get notice of the | |
5523 | event when the thread is just on the verge of exiting a | |
5524 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5525 | into user code.) */ |
488f131b | 5526 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5527 | if (handle_syscall_event (ecs) == 0) |
5528 | process_event_stop_test (ecs); | |
5529 | return; | |
c906108c | 5530 | |
488f131b | 5531 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5532 | handle_signal_stop (ecs); |
5533 | return; | |
c906108c | 5534 | |
b2175913 MS |
5535 | case TARGET_WAITKIND_NO_HISTORY: |
5536 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5537 | |
d1988021 | 5538 | /* Switch to the stopped thread. */ |
00431a78 | 5539 | context_switch (ecs); |
4100594e | 5540 | infrun_log_debug ("stopped"); |
d1988021 | 5541 | |
34b7e8a6 | 5542 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5543 | ecs->event_thread->suspend.stop_pc |
5544 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5545 | |
5546 | if (handle_stop_requested (ecs)) | |
5547 | return; | |
5548 | ||
76727919 | 5549 | gdb::observers::no_history.notify (); |
22bcd14b | 5550 | stop_waiting (ecs); |
b2175913 | 5551 | return; |
488f131b | 5552 | } |
4f5d7f63 PA |
5553 | } |
5554 | ||
372316f1 PA |
5555 | /* Restart threads back to what they were trying to do back when we |
5556 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5557 | ignored. */ | |
4d9d9d04 PA |
5558 | |
5559 | static void | |
372316f1 PA |
5560 | restart_threads (struct thread_info *event_thread) |
5561 | { | |
372316f1 PA |
5562 | /* In case the instruction just stepped spawned a new thread. */ |
5563 | update_thread_list (); | |
5564 | ||
08036331 | 5565 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5566 | { |
f3f8ece4 PA |
5567 | switch_to_thread_no_regs (tp); |
5568 | ||
372316f1 PA |
5569 | if (tp == event_thread) |
5570 | { | |
4100594e SM |
5571 | infrun_log_debug ("restart threads: [%s] is event thread", |
5572 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5573 | continue; |
5574 | } | |
5575 | ||
5576 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5577 | { | |
4100594e SM |
5578 | infrun_log_debug ("restart threads: [%s] not meant to be running", |
5579 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5580 | continue; |
5581 | } | |
5582 | ||
5583 | if (tp->resumed) | |
5584 | { | |
4100594e SM |
5585 | infrun_log_debug ("restart threads: [%s] resumed", |
5586 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5587 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
5588 | continue; | |
5589 | } | |
5590 | ||
5591 | if (thread_is_in_step_over_chain (tp)) | |
5592 | { | |
4100594e SM |
5593 | infrun_log_debug ("restart threads: [%s] needs step-over", |
5594 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5595 | gdb_assert (!tp->resumed); |
5596 | continue; | |
5597 | } | |
5598 | ||
5599 | ||
5600 | if (tp->suspend.waitstatus_pending_p) | |
5601 | { | |
4100594e SM |
5602 | infrun_log_debug ("restart threads: [%s] has pending status", |
5603 | target_pid_to_str (tp->ptid).c_str ()); | |
719546c4 | 5604 | tp->resumed = true; |
372316f1 PA |
5605 | continue; |
5606 | } | |
5607 | ||
c65d6b55 PA |
5608 | gdb_assert (!tp->stop_requested); |
5609 | ||
372316f1 PA |
5610 | /* If some thread needs to start a step-over at this point, it |
5611 | should still be in the step-over queue, and thus skipped | |
5612 | above. */ | |
5613 | if (thread_still_needs_step_over (tp)) | |
5614 | { | |
5615 | internal_error (__FILE__, __LINE__, | |
5616 | "thread [%s] needs a step-over, but not in " | |
5617 | "step-over queue\n", | |
a068643d | 5618 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5619 | } |
5620 | ||
5621 | if (currently_stepping (tp)) | |
5622 | { | |
4100594e SM |
5623 | infrun_log_debug ("restart threads: [%s] was stepping", |
5624 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
5625 | keep_going_stepped_thread (tp); |
5626 | } | |
5627 | else | |
5628 | { | |
5629 | struct execution_control_state ecss; | |
5630 | struct execution_control_state *ecs = &ecss; | |
5631 | ||
4100594e SM |
5632 | infrun_log_debug ("restart threads: [%s] continuing", |
5633 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 5634 | reset_ecs (ecs, tp); |
00431a78 | 5635 | switch_to_thread (tp); |
372316f1 PA |
5636 | keep_going_pass_signal (ecs); |
5637 | } | |
5638 | } | |
5639 | } | |
5640 | ||
5641 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5642 | a pending waitstatus. */ | |
5643 | ||
5644 | static int | |
5645 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5646 | void *arg) | |
5647 | { | |
5648 | return (tp->resumed | |
5649 | && tp->suspend.waitstatus_pending_p); | |
5650 | } | |
5651 | ||
5652 | /* Called when we get an event that may finish an in-line or | |
5653 | out-of-line (displaced stepping) step-over started previously. | |
5654 | Return true if the event is processed and we should go back to the | |
5655 | event loop; false if the caller should continue processing the | |
5656 | event. */ | |
5657 | ||
5658 | static int | |
4d9d9d04 PA |
5659 | finish_step_over (struct execution_control_state *ecs) |
5660 | { | |
372316f1 PA |
5661 | int had_step_over_info; |
5662 | ||
e088209c SM |
5663 | displaced_step_finish (ecs->event_thread, |
5664 | ecs->event_thread->suspend.stop_signal); | |
4d9d9d04 | 5665 | |
372316f1 PA |
5666 | had_step_over_info = step_over_info_valid_p (); |
5667 | ||
5668 | if (had_step_over_info) | |
4d9d9d04 PA |
5669 | { |
5670 | /* If we're stepping over a breakpoint with all threads locked, | |
5671 | then only the thread that was stepped should be reporting | |
5672 | back an event. */ | |
5673 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5674 | ||
c65d6b55 | 5675 | clear_step_over_info (); |
4d9d9d04 PA |
5676 | } |
5677 | ||
fbea99ea | 5678 | if (!target_is_non_stop_p ()) |
372316f1 | 5679 | return 0; |
4d9d9d04 PA |
5680 | |
5681 | /* Start a new step-over in another thread if there's one that | |
5682 | needs it. */ | |
5683 | start_step_over (); | |
372316f1 PA |
5684 | |
5685 | /* If we were stepping over a breakpoint before, and haven't started | |
5686 | a new in-line step-over sequence, then restart all other threads | |
5687 | (except the event thread). We can't do this in all-stop, as then | |
5688 | e.g., we wouldn't be able to issue any other remote packet until | |
5689 | these other threads stop. */ | |
5690 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5691 | { | |
5692 | struct thread_info *pending; | |
5693 | ||
5694 | /* If we only have threads with pending statuses, the restart | |
5695 | below won't restart any thread and so nothing re-inserts the | |
5696 | breakpoint we just stepped over. But we need it inserted | |
5697 | when we later process the pending events, otherwise if | |
5698 | another thread has a pending event for this breakpoint too, | |
5699 | we'd discard its event (because the breakpoint that | |
5700 | originally caused the event was no longer inserted). */ | |
00431a78 | 5701 | context_switch (ecs); |
372316f1 PA |
5702 | insert_breakpoints (); |
5703 | ||
5704 | restart_threads (ecs->event_thread); | |
5705 | ||
5706 | /* If we have events pending, go through handle_inferior_event | |
5707 | again, picking up a pending event at random. This avoids | |
5708 | thread starvation. */ | |
5709 | ||
5710 | /* But not if we just stepped over a watchpoint in order to let | |
5711 | the instruction execute so we can evaluate its expression. | |
5712 | The set of watchpoints that triggered is recorded in the | |
5713 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5714 | If we processed another event first, that other event could | |
5715 | clobber this info. */ | |
5716 | if (ecs->event_thread->stepping_over_watchpoint) | |
5717 | return 0; | |
5718 | ||
5719 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5720 | NULL); | |
5721 | if (pending != NULL) | |
5722 | { | |
5723 | struct thread_info *tp = ecs->event_thread; | |
5724 | struct regcache *regcache; | |
5725 | ||
4100594e SM |
5726 | infrun_log_debug ("found resumed threads with " |
5727 | "pending events, saving status"); | |
372316f1 PA |
5728 | |
5729 | gdb_assert (pending != tp); | |
5730 | ||
5731 | /* Record the event thread's event for later. */ | |
5732 | save_waitstatus (tp, &ecs->ws); | |
5733 | /* This was cleared early, by handle_inferior_event. Set it | |
5734 | so this pending event is considered by | |
5735 | do_target_wait. */ | |
719546c4 | 5736 | tp->resumed = true; |
372316f1 PA |
5737 | |
5738 | gdb_assert (!tp->executing); | |
5739 | ||
00431a78 | 5740 | regcache = get_thread_regcache (tp); |
372316f1 PA |
5741 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
5742 | ||
4100594e SM |
5743 | infrun_log_debug ("saved stop_pc=%s for %s " |
5744 | "(currently_stepping=%d)\n", | |
5745 | paddress (target_gdbarch (), | |
5746 | tp->suspend.stop_pc), | |
5747 | target_pid_to_str (tp->ptid).c_str (), | |
5748 | currently_stepping (tp)); | |
372316f1 PA |
5749 | |
5750 | /* This in-line step-over finished; clear this so we won't | |
5751 | start a new one. This is what handle_signal_stop would | |
5752 | do, if we returned false. */ | |
5753 | tp->stepping_over_breakpoint = 0; | |
5754 | ||
5755 | /* Wake up the event loop again. */ | |
5756 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5757 | ||
5758 | prepare_to_wait (ecs); | |
5759 | return 1; | |
5760 | } | |
5761 | } | |
5762 | ||
5763 | return 0; | |
4d9d9d04 PA |
5764 | } |
5765 | ||
4f5d7f63 PA |
5766 | /* Come here when the program has stopped with a signal. */ |
5767 | ||
5768 | static void | |
5769 | handle_signal_stop (struct execution_control_state *ecs) | |
5770 | { | |
5771 | struct frame_info *frame; | |
5772 | struct gdbarch *gdbarch; | |
5773 | int stopped_by_watchpoint; | |
5774 | enum stop_kind stop_soon; | |
5775 | int random_signal; | |
c906108c | 5776 | |
f0407826 DE |
5777 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5778 | ||
c65d6b55 PA |
5779 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5780 | ||
f0407826 DE |
5781 | /* Do we need to clean up the state of a thread that has |
5782 | completed a displaced single-step? (Doing so usually affects | |
5783 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5784 | if (finish_step_over (ecs)) |
5785 | return; | |
f0407826 DE |
5786 | |
5787 | /* If we either finished a single-step or hit a breakpoint, but | |
5788 | the user wanted this thread to be stopped, pretend we got a | |
5789 | SIG0 (generic unsignaled stop). */ | |
5790 | if (ecs->event_thread->stop_requested | |
5791 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5792 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5793 | |
f2ffa92b PA |
5794 | ecs->event_thread->suspend.stop_pc |
5795 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 5796 | |
527159b7 | 5797 | if (debug_infrun) |
237fc4c9 | 5798 | { |
00431a78 | 5799 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 5800 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 5801 | |
f3f8ece4 | 5802 | switch_to_thread (ecs->event_thread); |
5af949e3 | 5803 | |
4100594e SM |
5804 | infrun_log_debug ("stop_pc=%s", |
5805 | paddress (reg_gdbarch, | |
5806 | ecs->event_thread->suspend.stop_pc)); | |
d92524f1 | 5807 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5808 | { |
5809 | CORE_ADDR addr; | |
abbb1732 | 5810 | |
4100594e | 5811 | infrun_log_debug ("stopped by watchpoint"); |
237fc4c9 | 5812 | |
8b88a78e | 5813 | if (target_stopped_data_address (current_top_target (), &addr)) |
4100594e SM |
5814 | infrun_log_debug ("stopped data address=%s", |
5815 | paddress (reg_gdbarch, addr)); | |
237fc4c9 | 5816 | else |
4100594e | 5817 | infrun_log_debug ("(no data address available)"); |
237fc4c9 PA |
5818 | } |
5819 | } | |
527159b7 | 5820 | |
36fa8042 PA |
5821 | /* This is originated from start_remote(), start_inferior() and |
5822 | shared libraries hook functions. */ | |
00431a78 | 5823 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
5824 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
5825 | { | |
00431a78 | 5826 | context_switch (ecs); |
4100594e | 5827 | infrun_log_debug ("quietly stopped"); |
36fa8042 | 5828 | stop_print_frame = 1; |
22bcd14b | 5829 | stop_waiting (ecs); |
36fa8042 PA |
5830 | return; |
5831 | } | |
5832 | ||
36fa8042 PA |
5833 | /* This originates from attach_command(). We need to overwrite |
5834 | the stop_signal here, because some kernels don't ignore a | |
5835 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5836 | See more comments in inferior.h. On the other hand, if we | |
5837 | get a non-SIGSTOP, report it to the user - assume the backend | |
5838 | will handle the SIGSTOP if it should show up later. | |
5839 | ||
5840 | Also consider that the attach is complete when we see a | |
5841 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5842 | target extended-remote report it instead of a SIGSTOP | |
5843 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5844 | signal, so this is no exception. | |
5845 | ||
5846 | Also consider that the attach is complete when we see a | |
5847 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5848 | the target to stop all threads of the inferior, in case the | |
5849 | low level attach operation doesn't stop them implicitly. If | |
5850 | they weren't stopped implicitly, then the stub will report a | |
5851 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5852 | other than GDB's request. */ | |
5853 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5854 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5855 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5856 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5857 | { | |
5858 | stop_print_frame = 1; | |
22bcd14b | 5859 | stop_waiting (ecs); |
36fa8042 PA |
5860 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5861 | return; | |
5862 | } | |
5863 | ||
488f131b | 5864 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 | 5865 | so, then switch to that thread. */ |
d7e15655 | 5866 | if (ecs->ptid != inferior_ptid) |
488f131b | 5867 | { |
4100594e | 5868 | infrun_log_debug ("context switch"); |
527159b7 | 5869 | |
00431a78 | 5870 | context_switch (ecs); |
c5aa993b | 5871 | |
9a4105ab | 5872 | if (deprecated_context_hook) |
00431a78 | 5873 | deprecated_context_hook (ecs->event_thread->global_num); |
488f131b | 5874 | } |
c906108c | 5875 | |
568d6575 UW |
5876 | /* At this point, get hold of the now-current thread's frame. */ |
5877 | frame = get_current_frame (); | |
5878 | gdbarch = get_frame_arch (frame); | |
5879 | ||
2adfaa28 | 5880 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5881 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5882 | { |
af48d08f | 5883 | struct regcache *regcache; |
af48d08f | 5884 | CORE_ADDR pc; |
2adfaa28 | 5885 | |
00431a78 | 5886 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
5887 | const address_space *aspace = regcache->aspace (); |
5888 | ||
af48d08f | 5889 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 5890 | |
af48d08f PA |
5891 | /* However, before doing so, if this single-step breakpoint was |
5892 | actually for another thread, set this thread up for moving | |
5893 | past it. */ | |
5894 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5895 | aspace, pc)) | |
5896 | { | |
5897 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 | 5898 | { |
4100594e SM |
5899 | infrun_log_debug ("[%s] hit another thread's single-step " |
5900 | "breakpoint", | |
5901 | target_pid_to_str (ecs->ptid).c_str ()); | |
af48d08f PA |
5902 | ecs->hit_singlestep_breakpoint = 1; |
5903 | } | |
5904 | } | |
5905 | else | |
5906 | { | |
4100594e SM |
5907 | infrun_log_debug ("[%s] hit its single-step breakpoint", |
5908 | target_pid_to_str (ecs->ptid).c_str ()); | |
2adfaa28 | 5909 | } |
488f131b | 5910 | } |
af48d08f | 5911 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5912 | |
963f9c80 PA |
5913 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5914 | && ecs->event_thread->control.trap_expected | |
5915 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5916 | stopped_by_watchpoint = 0; |
5917 | else | |
5918 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5919 | ||
5920 | /* If necessary, step over this watchpoint. We'll be back to display | |
5921 | it in a moment. */ | |
5922 | if (stopped_by_watchpoint | |
d92524f1 | 5923 | && (target_have_steppable_watchpoint |
568d6575 | 5924 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5925 | { |
488f131b JB |
5926 | /* At this point, we are stopped at an instruction which has |
5927 | attempted to write to a piece of memory under control of | |
5928 | a watchpoint. The instruction hasn't actually executed | |
5929 | yet. If we were to evaluate the watchpoint expression | |
5930 | now, we would get the old value, and therefore no change | |
5931 | would seem to have occurred. | |
5932 | ||
5933 | In order to make watchpoints work `right', we really need | |
5934 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5935 | watchpoint expression. We do this by single-stepping the |
5936 | target. | |
5937 | ||
7f89fd65 | 5938 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5939 | it. For example, the PA can (with some kernel cooperation) |
5940 | single step over a watchpoint without disabling the watchpoint. | |
5941 | ||
5942 | It is far more common to need to disable a watchpoint to step | |
5943 | the inferior over it. If we have non-steppable watchpoints, | |
5944 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5945 | disable all watchpoints. |
5946 | ||
5947 | Any breakpoint at PC must also be stepped over -- if there's | |
5948 | one, it will have already triggered before the watchpoint | |
5949 | triggered, and we either already reported it to the user, or | |
5950 | it didn't cause a stop and we called keep_going. In either | |
5951 | case, if there was a breakpoint at PC, we must be trying to | |
5952 | step past it. */ | |
5953 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5954 | keep_going (ecs); | |
488f131b JB |
5955 | return; |
5956 | } | |
5957 | ||
4e1c45ea | 5958 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5959 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5960 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5961 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5962 | stop_print_frame = 1; |
488f131b | 5963 | stopped_by_random_signal = 0; |
ddfe970e | 5964 | bpstat stop_chain = NULL; |
488f131b | 5965 | |
edb3359d DJ |
5966 | /* Hide inlined functions starting here, unless we just performed stepi or |
5967 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5968 | inline function call sites). */ | |
16c381f0 | 5969 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 5970 | { |
00431a78 PA |
5971 | const address_space *aspace |
5972 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
5973 | |
5974 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5975 | determine that the address is one where functions cannot have | |
5976 | been inlined. This improves performance with inferiors that | |
5977 | load a lot of shared libraries, because the solib event | |
5978 | breakpoint is defined as the address of a function (i.e. not | |
5979 | inline). Note that we have to check the previous PC as well | |
5980 | as the current one to catch cases when we have just | |
5981 | single-stepped off a breakpoint prior to reinstating it. | |
5982 | Note that we're assuming that the code we single-step to is | |
5983 | not inline, but that's not definitive: there's nothing | |
5984 | preventing the event breakpoint function from containing | |
5985 | inlined code, and the single-step ending up there. If the | |
5986 | user had set a breakpoint on that inlined code, the missing | |
5987 | skip_inline_frames call would break things. Fortunately | |
5988 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
5989 | if (!pc_at_non_inline_function (aspace, |
5990 | ecs->event_thread->suspend.stop_pc, | |
5991 | &ecs->ws) | |
a210c238 MR |
5992 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5993 | && ecs->event_thread->control.trap_expected | |
5994 | && pc_at_non_inline_function (aspace, | |
5995 | ecs->event_thread->prev_pc, | |
09ac7c10 | 5996 | &ecs->ws))) |
1c5a993e | 5997 | { |
f2ffa92b PA |
5998 | stop_chain = build_bpstat_chain (aspace, |
5999 | ecs->event_thread->suspend.stop_pc, | |
6000 | &ecs->ws); | |
00431a78 | 6001 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
6002 | |
6003 | /* Re-fetch current thread's frame in case that invalidated | |
6004 | the frame cache. */ | |
6005 | frame = get_current_frame (); | |
6006 | gdbarch = get_frame_arch (frame); | |
6007 | } | |
0574c78f | 6008 | } |
edb3359d | 6009 | |
a493e3e2 | 6010 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 6011 | && ecs->event_thread->control.trap_expected |
568d6575 | 6012 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6013 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6014 | { |
b50d7442 | 6015 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6016 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6017 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6018 | with a delay slot. It needs to be stepped twice, once for |
6019 | the instruction and once for the delay slot. */ | |
6020 | int step_through_delay | |
568d6575 | 6021 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6022 | |
4100594e SM |
6023 | if (step_through_delay) |
6024 | infrun_log_debug ("step through delay"); | |
6025 | ||
16c381f0 JK |
6026 | if (ecs->event_thread->control.step_range_end == 0 |
6027 | && step_through_delay) | |
3352ef37 AC |
6028 | { |
6029 | /* The user issued a continue when stopped at a breakpoint. | |
6030 | Set up for another trap and get out of here. */ | |
4e1c45ea | 6031 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6032 | keep_going (ecs); |
6033 | return; | |
6034 | } | |
6035 | else if (step_through_delay) | |
6036 | { | |
6037 | /* The user issued a step when stopped at a breakpoint. | |
6038 | Maybe we should stop, maybe we should not - the delay | |
6039 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6040 | case, don't decide that here, just set |
6041 | ecs->stepping_over_breakpoint, making sure we | |
6042 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6043 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6044 | } |
6045 | } | |
6046 | ||
ab04a2af TT |
6047 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6048 | handles this event. */ | |
6049 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6050 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
6051 | ecs->event_thread->suspend.stop_pc, |
6052 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 6053 | |
ab04a2af TT |
6054 | /* Following in case break condition called a |
6055 | function. */ | |
6056 | stop_print_frame = 1; | |
73dd234f | 6057 | |
ab04a2af TT |
6058 | /* This is where we handle "moribund" watchpoints. Unlike |
6059 | software breakpoints traps, hardware watchpoint traps are | |
6060 | always distinguishable from random traps. If no high-level | |
6061 | watchpoint is associated with the reported stop data address | |
6062 | anymore, then the bpstat does not explain the signal --- | |
6063 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6064 | set. */ | |
6065 | ||
4100594e | 6066 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
47591c29 | 6067 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6068 | GDB_SIGNAL_TRAP) |
ab04a2af | 6069 | && stopped_by_watchpoint) |
4100594e SM |
6070 | { |
6071 | infrun_log_debug ("no user watchpoint explains watchpoint SIGTRAP, " | |
6072 | "ignoring"); | |
6073 | } | |
73dd234f | 6074 | |
bac7d97b | 6075 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6076 | at one stage in the past included checks for an inferior |
6077 | function call's call dummy's return breakpoint. The original | |
6078 | comment, that went with the test, read: | |
03cebad2 | 6079 | |
ab04a2af TT |
6080 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6081 | another signal besides SIGTRAP, so check here as well as | |
6082 | above.'' | |
73dd234f | 6083 | |
ab04a2af TT |
6084 | If someone ever tries to get call dummys on a |
6085 | non-executable stack to work (where the target would stop | |
6086 | with something like a SIGSEGV), then those tests might need | |
6087 | to be re-instated. Given, however, that the tests were only | |
6088 | enabled when momentary breakpoints were not being used, I | |
6089 | suspect that it won't be the case. | |
488f131b | 6090 | |
ab04a2af TT |
6091 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6092 | be necessary for call dummies on a non-executable stack on | |
6093 | SPARC. */ | |
488f131b | 6094 | |
bac7d97b | 6095 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6096 | random_signal |
6097 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
6098 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 6099 | |
1cf4d951 PA |
6100 | /* Maybe this was a trap for a software breakpoint that has since |
6101 | been removed. */ | |
6102 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6103 | { | |
5133a315 LM |
6104 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
6105 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
6106 | { |
6107 | struct regcache *regcache; | |
6108 | int decr_pc; | |
6109 | ||
6110 | /* Re-adjust PC to what the program would see if GDB was not | |
6111 | debugging it. */ | |
00431a78 | 6112 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6113 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6114 | if (decr_pc != 0) |
6115 | { | |
07036511 TT |
6116 | gdb::optional<scoped_restore_tmpl<int>> |
6117 | restore_operation_disable; | |
1cf4d951 PA |
6118 | |
6119 | if (record_full_is_used ()) | |
07036511 TT |
6120 | restore_operation_disable.emplace |
6121 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6122 | |
f2ffa92b PA |
6123 | regcache_write_pc (regcache, |
6124 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
6125 | } |
6126 | } | |
6127 | else | |
6128 | { | |
6129 | /* A delayed software breakpoint event. Ignore the trap. */ | |
4100594e | 6130 | infrun_log_debug ("delayed software breakpoint trap, ignoring"); |
1cf4d951 PA |
6131 | random_signal = 0; |
6132 | } | |
6133 | } | |
6134 | ||
6135 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6136 | has since been removed. */ | |
6137 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6138 | { | |
6139 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
4100594e SM |
6140 | infrun_log_debug ("delayed hardware breakpoint/watchpoint " |
6141 | "trap, ignoring"); | |
1cf4d951 PA |
6142 | random_signal = 0; |
6143 | } | |
6144 | ||
bac7d97b PA |
6145 | /* If not, perhaps stepping/nexting can. */ |
6146 | if (random_signal) | |
6147 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6148 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6149 | |
2adfaa28 PA |
6150 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6151 | thread. Single-step breakpoints are transparent to the | |
6152 | breakpoints module. */ | |
6153 | if (random_signal) | |
6154 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6155 | ||
bac7d97b PA |
6156 | /* No? Perhaps we got a moribund watchpoint. */ |
6157 | if (random_signal) | |
6158 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6159 | |
c65d6b55 PA |
6160 | /* Always stop if the user explicitly requested this thread to |
6161 | remain stopped. */ | |
6162 | if (ecs->event_thread->stop_requested) | |
6163 | { | |
6164 | random_signal = 1; | |
4100594e | 6165 | infrun_log_debug ("user-requested stop"); |
c65d6b55 PA |
6166 | } |
6167 | ||
488f131b JB |
6168 | /* For the program's own signals, act according to |
6169 | the signal handling tables. */ | |
6170 | ||
ce12b012 | 6171 | if (random_signal) |
488f131b JB |
6172 | { |
6173 | /* Signal not for debugging purposes. */ | |
5b6d1e4f | 6174 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
c9737c08 | 6175 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6176 | |
4100594e SM |
6177 | infrun_log_debug ("random signal (%s)", |
6178 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6179 | |
488f131b JB |
6180 | stopped_by_random_signal = 1; |
6181 | ||
252fbfc8 PA |
6182 | /* Always stop on signals if we're either just gaining control |
6183 | of the program, or the user explicitly requested this thread | |
6184 | to remain stopped. */ | |
d6b48e9c | 6185 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6186 | || ecs->event_thread->stop_requested |
24291992 | 6187 | || (!inf->detaching |
16c381f0 | 6188 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 6189 | { |
22bcd14b | 6190 | stop_waiting (ecs); |
488f131b JB |
6191 | return; |
6192 | } | |
b57bacec PA |
6193 | |
6194 | /* Notify observers the signal has "handle print" set. Note we | |
6195 | returned early above if stopping; normal_stop handles the | |
6196 | printing in that case. */ | |
6197 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6198 | { | |
6199 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6200 | target_terminal::ours_for_output (); |
76727919 | 6201 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 6202 | target_terminal::inferior (); |
b57bacec | 6203 | } |
488f131b JB |
6204 | |
6205 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6206 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6207 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6208 | |
f2ffa92b | 6209 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 6210 | && ecs->event_thread->control.trap_expected |
8358c15c | 6211 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6212 | { |
6213 | /* We were just starting a new sequence, attempting to | |
6214 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6215 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6216 | of the stepping range so GDB needs to remember to, when |
6217 | the signal handler returns, resume stepping off that | |
6218 | breakpoint. */ | |
6219 | /* To simplify things, "continue" is forced to use the same | |
6220 | code paths as single-step - set a breakpoint at the | |
6221 | signal return address and then, once hit, step off that | |
6222 | breakpoint. */ | |
4100594e | 6223 | infrun_log_debug ("signal arrived while stepping over breakpoint"); |
d3169d93 | 6224 | |
2c03e5be | 6225 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6226 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6227 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6228 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6229 | |
6230 | /* If we were nexting/stepping some other thread, switch to | |
6231 | it, so that we don't continue it, losing control. */ | |
6232 | if (!switch_back_to_stepped_thread (ecs)) | |
6233 | keep_going (ecs); | |
9d799f85 | 6234 | return; |
68f53502 | 6235 | } |
9d799f85 | 6236 | |
e5f8a7cc | 6237 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
6238 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6239 | ecs->event_thread) | |
e5f8a7cc | 6240 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 6241 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6242 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6243 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6244 | { |
6245 | /* The inferior is about to take a signal that will take it | |
6246 | out of the single step range. Set a breakpoint at the | |
6247 | current PC (which is presumably where the signal handler | |
6248 | will eventually return) and then allow the inferior to | |
6249 | run free. | |
6250 | ||
6251 | Note that this is only needed for a signal delivered | |
6252 | while in the single-step range. Nested signals aren't a | |
6253 | problem as they eventually all return. */ | |
4100594e | 6254 | infrun_log_debug ("signal may take us out of single-step range"); |
237fc4c9 | 6255 | |
372316f1 | 6256 | clear_step_over_info (); |
2c03e5be | 6257 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6258 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6259 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6260 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6261 | keep_going (ecs); |
6262 | return; | |
d303a6c7 | 6263 | } |
9d799f85 | 6264 | |
85102364 | 6265 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6266 | when either there's a nested signal, or when there's a |
6267 | pending signal enabled just as the signal handler returns | |
6268 | (leaving the inferior at the step-resume-breakpoint without | |
6269 | actually executing it). Either way continue until the | |
6270 | breakpoint is really hit. */ | |
c447ac0b PA |
6271 | |
6272 | if (!switch_back_to_stepped_thread (ecs)) | |
6273 | { | |
4100594e | 6274 | infrun_log_debug ("random signal, keep going"); |
c447ac0b PA |
6275 | |
6276 | keep_going (ecs); | |
6277 | } | |
6278 | return; | |
488f131b | 6279 | } |
94c57d6a PA |
6280 | |
6281 | process_event_stop_test (ecs); | |
6282 | } | |
6283 | ||
6284 | /* Come here when we've got some debug event / signal we can explain | |
6285 | (IOW, not a random signal), and test whether it should cause a | |
6286 | stop, or whether we should resume the inferior (transparently). | |
6287 | E.g., could be a breakpoint whose condition evaluates false; we | |
6288 | could be still stepping within the line; etc. */ | |
6289 | ||
6290 | static void | |
6291 | process_event_stop_test (struct execution_control_state *ecs) | |
6292 | { | |
6293 | struct symtab_and_line stop_pc_sal; | |
6294 | struct frame_info *frame; | |
6295 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6296 | CORE_ADDR jmp_buf_pc; |
6297 | struct bpstat_what what; | |
94c57d6a | 6298 | |
cdaa5b73 | 6299 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6300 | |
cdaa5b73 PA |
6301 | frame = get_current_frame (); |
6302 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6303 | |
cdaa5b73 | 6304 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6305 | |
cdaa5b73 PA |
6306 | if (what.call_dummy) |
6307 | { | |
6308 | stop_stack_dummy = what.call_dummy; | |
6309 | } | |
186c406b | 6310 | |
243a9253 PA |
6311 | /* A few breakpoint types have callbacks associated (e.g., |
6312 | bp_jit_event). Run them now. */ | |
6313 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6314 | ||
cdaa5b73 PA |
6315 | /* If we hit an internal event that triggers symbol changes, the |
6316 | current frame will be invalidated within bpstat_what (e.g., if we | |
6317 | hit an internal solib event). Re-fetch it. */ | |
6318 | frame = get_current_frame (); | |
6319 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6320 | |
cdaa5b73 PA |
6321 | switch (what.main_action) |
6322 | { | |
6323 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6324 | /* If we hit the breakpoint at longjmp while stepping, we | |
6325 | install a momentary breakpoint at the target of the | |
6326 | jmp_buf. */ | |
186c406b | 6327 | |
4100594e | 6328 | infrun_log_debug ("BPSTAT_WHAT_SET_LONGJMP_RESUME"); |
186c406b | 6329 | |
cdaa5b73 | 6330 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6331 | |
cdaa5b73 PA |
6332 | if (what.is_longjmp) |
6333 | { | |
6334 | struct value *arg_value; | |
6335 | ||
6336 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6337 | then use it to extract the arguments. The destination PC | |
6338 | is the third argument to the probe. */ | |
6339 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6340 | if (arg_value) | |
8fa0c4f8 AA |
6341 | { |
6342 | jmp_buf_pc = value_as_address (arg_value); | |
6343 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6344 | } | |
cdaa5b73 PA |
6345 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6346 | || !gdbarch_get_longjmp_target (gdbarch, | |
6347 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6348 | { |
4100594e SM |
6349 | infrun_log_debug ("BPSTAT_WHAT_SET_LONGJMP_RESUME " |
6350 | "(!gdbarch_get_longjmp_target)"); | |
cdaa5b73 PA |
6351 | keep_going (ecs); |
6352 | return; | |
e2e4d78b | 6353 | } |
e2e4d78b | 6354 | |
cdaa5b73 PA |
6355 | /* Insert a breakpoint at resume address. */ |
6356 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6357 | } | |
6358 | else | |
6359 | check_exception_resume (ecs, frame); | |
6360 | keep_going (ecs); | |
6361 | return; | |
e81a37f7 | 6362 | |
cdaa5b73 PA |
6363 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6364 | { | |
6365 | struct frame_info *init_frame; | |
e81a37f7 | 6366 | |
cdaa5b73 | 6367 | /* There are several cases to consider. |
c906108c | 6368 | |
cdaa5b73 PA |
6369 | 1. The initiating frame no longer exists. In this case we |
6370 | must stop, because the exception or longjmp has gone too | |
6371 | far. | |
2c03e5be | 6372 | |
cdaa5b73 PA |
6373 | 2. The initiating frame exists, and is the same as the |
6374 | current frame. We stop, because the exception or longjmp | |
6375 | has been caught. | |
2c03e5be | 6376 | |
cdaa5b73 PA |
6377 | 3. The initiating frame exists and is different from the |
6378 | current frame. This means the exception or longjmp has | |
6379 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6380 | |
cdaa5b73 PA |
6381 | 4. longjmp breakpoint has been placed just to protect |
6382 | against stale dummy frames and user is not interested in | |
6383 | stopping around longjmps. */ | |
c5aa993b | 6384 | |
4100594e | 6385 | infrun_log_debug ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME"); |
c5aa993b | 6386 | |
cdaa5b73 PA |
6387 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6388 | != NULL); | |
6389 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6390 | |
cdaa5b73 PA |
6391 | if (what.is_longjmp) |
6392 | { | |
b67a2c6f | 6393 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6394 | |
cdaa5b73 | 6395 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6396 | { |
cdaa5b73 PA |
6397 | /* Case 4. */ |
6398 | keep_going (ecs); | |
6399 | return; | |
e5ef252a | 6400 | } |
cdaa5b73 | 6401 | } |
c5aa993b | 6402 | |
cdaa5b73 | 6403 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6404 | |
cdaa5b73 PA |
6405 | if (init_frame) |
6406 | { | |
6407 | struct frame_id current_id | |
6408 | = get_frame_id (get_current_frame ()); | |
6409 | if (frame_id_eq (current_id, | |
6410 | ecs->event_thread->initiating_frame)) | |
6411 | { | |
6412 | /* Case 2. Fall through. */ | |
6413 | } | |
6414 | else | |
6415 | { | |
6416 | /* Case 3. */ | |
6417 | keep_going (ecs); | |
6418 | return; | |
6419 | } | |
68f53502 | 6420 | } |
488f131b | 6421 | |
cdaa5b73 PA |
6422 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6423 | exists. */ | |
6424 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6425 | |
bdc36728 | 6426 | end_stepping_range (ecs); |
cdaa5b73 PA |
6427 | } |
6428 | return; | |
e5ef252a | 6429 | |
cdaa5b73 | 6430 | case BPSTAT_WHAT_SINGLE: |
4100594e | 6431 | infrun_log_debug ("BPSTAT_WHAT_SINGLE"); |
cdaa5b73 PA |
6432 | ecs->event_thread->stepping_over_breakpoint = 1; |
6433 | /* Still need to check other stuff, at least the case where we | |
6434 | are stepping and step out of the right range. */ | |
6435 | break; | |
e5ef252a | 6436 | |
cdaa5b73 | 6437 | case BPSTAT_WHAT_STEP_RESUME: |
4100594e | 6438 | infrun_log_debug ("BPSTAT_WHAT_STEP_RESUME"); |
e5ef252a | 6439 | |
cdaa5b73 PA |
6440 | delete_step_resume_breakpoint (ecs->event_thread); |
6441 | if (ecs->event_thread->control.proceed_to_finish | |
6442 | && execution_direction == EXEC_REVERSE) | |
6443 | { | |
6444 | struct thread_info *tp = ecs->event_thread; | |
6445 | ||
6446 | /* We are finishing a function in reverse, and just hit the | |
6447 | step-resume breakpoint at the start address of the | |
6448 | function, and we're almost there -- just need to back up | |
6449 | by one more single-step, which should take us back to the | |
6450 | function call. */ | |
6451 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6452 | keep_going (ecs); | |
e5ef252a | 6453 | return; |
cdaa5b73 PA |
6454 | } |
6455 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6456 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6457 | && execution_direction == EXEC_REVERSE) |
6458 | { | |
6459 | /* We are stepping over a function call in reverse, and just | |
6460 | hit the step-resume breakpoint at the start address of | |
6461 | the function. Go back to single-stepping, which should | |
6462 | take us back to the function call. */ | |
6463 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6464 | keep_going (ecs); | |
6465 | return; | |
6466 | } | |
6467 | break; | |
e5ef252a | 6468 | |
cdaa5b73 | 6469 | case BPSTAT_WHAT_STOP_NOISY: |
4100594e | 6470 | infrun_log_debug ("BPSTAT_WHAT_STOP_NOISY"); |
cdaa5b73 | 6471 | stop_print_frame = 1; |
e5ef252a | 6472 | |
99619bea PA |
6473 | /* Assume the thread stopped for a breapoint. We'll still check |
6474 | whether a/the breakpoint is there when the thread is next | |
6475 | resumed. */ | |
6476 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6477 | |
22bcd14b | 6478 | stop_waiting (ecs); |
cdaa5b73 | 6479 | return; |
e5ef252a | 6480 | |
cdaa5b73 | 6481 | case BPSTAT_WHAT_STOP_SILENT: |
4100594e | 6482 | infrun_log_debug ("BPSTAT_WHAT_STOP_SILENT"); |
cdaa5b73 | 6483 | stop_print_frame = 0; |
e5ef252a | 6484 | |
99619bea PA |
6485 | /* Assume the thread stopped for a breapoint. We'll still check |
6486 | whether a/the breakpoint is there when the thread is next | |
6487 | resumed. */ | |
6488 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6489 | stop_waiting (ecs); |
cdaa5b73 PA |
6490 | return; |
6491 | ||
6492 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
4100594e | 6493 | infrun_log_debug ("BPSTAT_WHAT_HP_STEP_RESUME"); |
cdaa5b73 PA |
6494 | |
6495 | delete_step_resume_breakpoint (ecs->event_thread); | |
6496 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6497 | { | |
6498 | /* Back when the step-resume breakpoint was inserted, we | |
6499 | were trying to single-step off a breakpoint. Go back to | |
6500 | doing that. */ | |
6501 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6502 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6503 | keep_going (ecs); | |
6504 | return; | |
e5ef252a | 6505 | } |
cdaa5b73 PA |
6506 | break; |
6507 | ||
6508 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6509 | break; | |
e5ef252a | 6510 | } |
c906108c | 6511 | |
af48d08f PA |
6512 | /* If we stepped a permanent breakpoint and we had a high priority |
6513 | step-resume breakpoint for the address we stepped, but we didn't | |
6514 | hit it, then we must have stepped into the signal handler. The | |
6515 | step-resume was only necessary to catch the case of _not_ | |
6516 | stepping into the handler, so delete it, and fall through to | |
6517 | checking whether the step finished. */ | |
6518 | if (ecs->event_thread->stepped_breakpoint) | |
6519 | { | |
6520 | struct breakpoint *sr_bp | |
6521 | = ecs->event_thread->control.step_resume_breakpoint; | |
6522 | ||
8d707a12 PA |
6523 | if (sr_bp != NULL |
6524 | && sr_bp->loc->permanent | |
af48d08f PA |
6525 | && sr_bp->type == bp_hp_step_resume |
6526 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6527 | { | |
4100594e | 6528 | infrun_log_debug ("stepped permanent breakpoint, stopped in handler"); |
af48d08f PA |
6529 | delete_step_resume_breakpoint (ecs->event_thread); |
6530 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6531 | } | |
6532 | } | |
6533 | ||
cdaa5b73 PA |
6534 | /* We come here if we hit a breakpoint but should not stop for it. |
6535 | Possibly we also were stepping and should stop for that. So fall | |
6536 | through and test for stepping. But, if not stepping, do not | |
6537 | stop. */ | |
c906108c | 6538 | |
a7212384 UW |
6539 | /* In all-stop mode, if we're currently stepping but have stopped in |
6540 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6541 | if (switch_back_to_stepped_thread (ecs)) |
6542 | return; | |
776f04fa | 6543 | |
8358c15c | 6544 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6545 | { |
4100594e | 6546 | infrun_log_debug ("step-resume breakpoint is inserted"); |
527159b7 | 6547 | |
488f131b JB |
6548 | /* Having a step-resume breakpoint overrides anything |
6549 | else having to do with stepping commands until | |
6550 | that breakpoint is reached. */ | |
488f131b JB |
6551 | keep_going (ecs); |
6552 | return; | |
6553 | } | |
c5aa993b | 6554 | |
16c381f0 | 6555 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6556 | { |
4100594e | 6557 | infrun_log_debug ("no stepping, continue"); |
488f131b | 6558 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6559 | keep_going (ecs); |
6560 | return; | |
6561 | } | |
c5aa993b | 6562 | |
4b7703ad JB |
6563 | /* Re-fetch current thread's frame in case the code above caused |
6564 | the frame cache to be re-initialized, making our FRAME variable | |
6565 | a dangling pointer. */ | |
6566 | frame = get_current_frame (); | |
628fe4e4 | 6567 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6568 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6569 | |
488f131b | 6570 | /* If stepping through a line, keep going if still within it. |
c906108c | 6571 | |
488f131b JB |
6572 | Note that step_range_end is the address of the first instruction |
6573 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6574 | within it! |
6575 | ||
6576 | Note also that during reverse execution, we may be stepping | |
6577 | through a function epilogue and therefore must detect when | |
6578 | the current-frame changes in the middle of a line. */ | |
6579 | ||
f2ffa92b PA |
6580 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6581 | ecs->event_thread) | |
31410e84 | 6582 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6583 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6584 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6585 | { |
4100594e SM |
6586 | infrun_log_debug |
6587 | ("stepping inside range [%s-%s]", | |
6588 | paddress (gdbarch, ecs->event_thread->control.step_range_start), | |
6589 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6590 | |
c1e36e3e PA |
6591 | /* Tentatively re-enable range stepping; `resume' disables it if |
6592 | necessary (e.g., if we're stepping over a breakpoint or we | |
6593 | have software watchpoints). */ | |
6594 | ecs->event_thread->control.may_range_step = 1; | |
6595 | ||
b2175913 MS |
6596 | /* When stepping backward, stop at beginning of line range |
6597 | (unless it's the function entry point, in which case | |
6598 | keep going back to the call point). */ | |
f2ffa92b | 6599 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6600 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6601 | && stop_pc != ecs->stop_func_start |
6602 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6603 | end_stepping_range (ecs); |
b2175913 MS |
6604 | else |
6605 | keep_going (ecs); | |
6606 | ||
488f131b JB |
6607 | return; |
6608 | } | |
c5aa993b | 6609 | |
488f131b | 6610 | /* We stepped out of the stepping range. */ |
c906108c | 6611 | |
488f131b | 6612 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6613 | loader dynamic symbol resolution code... |
6614 | ||
6615 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6616 | time loader code and reach the callee's address. | |
6617 | ||
6618 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6619 | the runtime loader code is handled just like any other | |
6620 | undebuggable function call. Now we need only keep stepping | |
6621 | backward through the trampoline code, and that's handled further | |
6622 | down, so there is nothing for us to do here. */ | |
6623 | ||
6624 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6625 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6626 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6627 | { |
4c8c40e6 | 6628 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6629 | gdbarch_skip_solib_resolver (gdbarch, |
6630 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6631 | |
4100594e | 6632 | infrun_log_debug ("stepped into dynsym resolve code"); |
527159b7 | 6633 | |
488f131b JB |
6634 | if (pc_after_resolver) |
6635 | { | |
6636 | /* Set up a step-resume breakpoint at the address | |
6637 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6638 | symtab_and_line sr_sal; |
488f131b | 6639 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6640 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6641 | |
a6d9a66e UW |
6642 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6643 | sr_sal, null_frame_id); | |
c5aa993b | 6644 | } |
c906108c | 6645 | |
488f131b JB |
6646 | keep_going (ecs); |
6647 | return; | |
6648 | } | |
c906108c | 6649 | |
1d509aa6 MM |
6650 | /* Step through an indirect branch thunk. */ |
6651 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6652 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6653 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 | 6654 | { |
4100594e | 6655 | infrun_log_debug ("stepped into indirect branch thunk"); |
1d509aa6 MM |
6656 | keep_going (ecs); |
6657 | return; | |
6658 | } | |
6659 | ||
16c381f0 JK |
6660 | if (ecs->event_thread->control.step_range_end != 1 |
6661 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6662 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6663 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6664 | { |
4100594e | 6665 | infrun_log_debug ("stepped into signal trampoline"); |
42edda50 | 6666 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6667 | a signal trampoline (either by a signal being delivered or by |
6668 | the signal handler returning). Just single-step until the | |
6669 | inferior leaves the trampoline (either by calling the handler | |
6670 | or returning). */ | |
488f131b JB |
6671 | keep_going (ecs); |
6672 | return; | |
6673 | } | |
c906108c | 6674 | |
14132e89 MR |
6675 | /* If we're in the return path from a shared library trampoline, |
6676 | we want to proceed through the trampoline when stepping. */ | |
6677 | /* macro/2012-04-25: This needs to come before the subroutine | |
6678 | call check below as on some targets return trampolines look | |
6679 | like subroutine calls (MIPS16 return thunks). */ | |
6680 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
6681 | ecs->event_thread->suspend.stop_pc, |
6682 | ecs->stop_func_name) | |
14132e89 MR |
6683 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6684 | { | |
6685 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
6686 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6687 | CORE_ADDR real_stop_pc | |
6688 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 | 6689 | |
4100594e | 6690 | infrun_log_debug ("stepped into solib return tramp"); |
14132e89 MR |
6691 | |
6692 | /* Only proceed through if we know where it's going. */ | |
6693 | if (real_stop_pc) | |
6694 | { | |
6695 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6696 | symtab_and_line sr_sal; |
14132e89 MR |
6697 | sr_sal.pc = real_stop_pc; |
6698 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6699 | sr_sal.pspace = get_frame_program_space (frame); | |
6700 | ||
6701 | /* Do not specify what the fp should be when we stop since | |
6702 | on some machines the prologue is where the new fp value | |
6703 | is established. */ | |
6704 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6705 | sr_sal, null_frame_id); | |
6706 | ||
6707 | /* Restart without fiddling with the step ranges or | |
6708 | other state. */ | |
6709 | keep_going (ecs); | |
6710 | return; | |
6711 | } | |
6712 | } | |
6713 | ||
c17eaafe DJ |
6714 | /* Check for subroutine calls. The check for the current frame |
6715 | equalling the step ID is not necessary - the check of the | |
6716 | previous frame's ID is sufficient - but it is a common case and | |
6717 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6718 | |
6719 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6720 | being equal, so to get into this block, both the current and | |
6721 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6722 | /* The outer_frame_id check is a heuristic to detect stepping |
6723 | through startup code. If we step over an instruction which | |
6724 | sets the stack pointer from an invalid value to a valid value, | |
6725 | we may detect that as a subroutine call from the mythical | |
6726 | "outermost" function. This could be fixed by marking | |
6727 | outermost frames as !stack_p,code_p,special_p. Then the | |
6728 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6729 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6730 | for more. */ |
edb3359d | 6731 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6732 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6733 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6734 | ecs->event_thread->control.step_stack_frame_id) |
6735 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6736 | outer_frame_id) |
885eeb5b | 6737 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 6738 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 6739 | { |
f2ffa92b | 6740 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 6741 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6742 | |
4100594e | 6743 | infrun_log_debug ("stepped into subroutine"); |
527159b7 | 6744 | |
b7a084be | 6745 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6746 | { |
6747 | /* I presume that step_over_calls is only 0 when we're | |
6748 | supposed to be stepping at the assembly language level | |
6749 | ("stepi"). Just stop. */ | |
388a8562 | 6750 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6751 | end_stepping_range (ecs); |
95918acb AC |
6752 | return; |
6753 | } | |
8fb3e588 | 6754 | |
388a8562 MS |
6755 | /* Reverse stepping through solib trampolines. */ |
6756 | ||
6757 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6758 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6759 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6760 | || (ecs->stop_func_start == 0 | |
6761 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6762 | { | |
6763 | /* Any solib trampoline code can be handled in reverse | |
6764 | by simply continuing to single-step. We have already | |
6765 | executed the solib function (backwards), and a few | |
6766 | steps will take us back through the trampoline to the | |
6767 | caller. */ | |
6768 | keep_going (ecs); | |
6769 | return; | |
6770 | } | |
6771 | ||
16c381f0 | 6772 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6773 | { |
b2175913 MS |
6774 | /* We're doing a "next". |
6775 | ||
6776 | Normal (forward) execution: set a breakpoint at the | |
6777 | callee's return address (the address at which the caller | |
6778 | will resume). | |
6779 | ||
6780 | Reverse (backward) execution. set the step-resume | |
6781 | breakpoint at the start of the function that we just | |
6782 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6783 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6784 | |
6785 | if (execution_direction == EXEC_REVERSE) | |
6786 | { | |
acf9414f JK |
6787 | /* If we're already at the start of the function, we've either |
6788 | just stepped backward into a single instruction function, | |
6789 | or stepped back out of a signal handler to the first instruction | |
6790 | of the function. Just keep going, which will single-step back | |
6791 | to the caller. */ | |
58c48e72 | 6792 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6793 | { |
acf9414f | 6794 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6795 | symtab_and_line sr_sal; |
acf9414f JK |
6796 | sr_sal.pc = ecs->stop_func_start; |
6797 | sr_sal.pspace = get_frame_program_space (frame); | |
6798 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6799 | sr_sal, null_frame_id); | |
6800 | } | |
b2175913 MS |
6801 | } |
6802 | else | |
568d6575 | 6803 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6804 | |
8567c30f AC |
6805 | keep_going (ecs); |
6806 | return; | |
6807 | } | |
a53c66de | 6808 | |
95918acb | 6809 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6810 | calling routine and the real function), locate the real |
6811 | function. That's what tells us (a) whether we want to step | |
6812 | into it at all, and (b) what prologue we want to run to the | |
6813 | end of, if we do step into it. */ | |
568d6575 | 6814 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6815 | if (real_stop_pc == 0) |
568d6575 | 6816 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6817 | if (real_stop_pc != 0) |
6818 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6819 | |
db5f024e | 6820 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6821 | { |
51abb421 | 6822 | symtab_and_line sr_sal; |
1b2bfbb9 | 6823 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6824 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6825 | |
a6d9a66e UW |
6826 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6827 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6828 | keep_going (ecs); |
6829 | return; | |
1b2bfbb9 RC |
6830 | } |
6831 | ||
95918acb | 6832 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6833 | thinking of stepping into and the function isn't on the skip |
6834 | list, step into it. | |
95918acb | 6835 | |
8fb3e588 AC |
6836 | If there are several symtabs at that PC (e.g. with include |
6837 | files), just want to know whether *any* of them have line | |
6838 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6839 | { |
6840 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6841 | |
95918acb | 6842 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6843 | if (tmp_sal.line != 0 |
85817405 | 6844 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
6845 | tmp_sal) |
6846 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 6847 | { |
b2175913 | 6848 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6849 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6850 | else |
568d6575 | 6851 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6852 | return; |
6853 | } | |
6854 | } | |
6855 | ||
6856 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6857 | set, we stop the step so that the user has a chance to switch |
6858 | in assembly mode. */ | |
16c381f0 | 6859 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6860 | && step_stop_if_no_debug) |
95918acb | 6861 | { |
bdc36728 | 6862 | end_stepping_range (ecs); |
95918acb AC |
6863 | return; |
6864 | } | |
6865 | ||
b2175913 MS |
6866 | if (execution_direction == EXEC_REVERSE) |
6867 | { | |
acf9414f JK |
6868 | /* If we're already at the start of the function, we've either just |
6869 | stepped backward into a single instruction function without line | |
6870 | number info, or stepped back out of a signal handler to the first | |
6871 | instruction of the function without line number info. Just keep | |
6872 | going, which will single-step back to the caller. */ | |
6873 | if (ecs->stop_func_start != stop_pc) | |
6874 | { | |
6875 | /* Set a breakpoint at callee's start address. | |
6876 | From there we can step once and be back in the caller. */ | |
51abb421 | 6877 | symtab_and_line sr_sal; |
acf9414f JK |
6878 | sr_sal.pc = ecs->stop_func_start; |
6879 | sr_sal.pspace = get_frame_program_space (frame); | |
6880 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6881 | sr_sal, null_frame_id); | |
6882 | } | |
b2175913 MS |
6883 | } |
6884 | else | |
6885 | /* Set a breakpoint at callee's return address (the address | |
6886 | at which the caller will resume). */ | |
568d6575 | 6887 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6888 | |
95918acb | 6889 | keep_going (ecs); |
488f131b | 6890 | return; |
488f131b | 6891 | } |
c906108c | 6892 | |
fdd654f3 MS |
6893 | /* Reverse stepping through solib trampolines. */ |
6894 | ||
6895 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6896 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 6897 | { |
f2ffa92b PA |
6898 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6899 | ||
fdd654f3 MS |
6900 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6901 | || (ecs->stop_func_start == 0 | |
6902 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6903 | { | |
6904 | /* Any solib trampoline code can be handled in reverse | |
6905 | by simply continuing to single-step. We have already | |
6906 | executed the solib function (backwards), and a few | |
6907 | steps will take us back through the trampoline to the | |
6908 | caller. */ | |
6909 | keep_going (ecs); | |
6910 | return; | |
6911 | } | |
6912 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6913 | { | |
6914 | /* Stepped backward into the solib dynsym resolver. | |
6915 | Set a breakpoint at its start and continue, then | |
6916 | one more step will take us out. */ | |
51abb421 | 6917 | symtab_and_line sr_sal; |
fdd654f3 | 6918 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 6919 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6920 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6921 | sr_sal, null_frame_id); | |
6922 | keep_going (ecs); | |
6923 | return; | |
6924 | } | |
6925 | } | |
6926 | ||
8c95582d AB |
6927 | /* This always returns the sal for the inner-most frame when we are in a |
6928 | stack of inlined frames, even if GDB actually believes that it is in a | |
6929 | more outer frame. This is checked for below by calls to | |
6930 | inline_skipped_frames. */ | |
f2ffa92b | 6931 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 6932 | |
1b2bfbb9 RC |
6933 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6934 | the trampoline processing logic, however, there are some trampolines | |
6935 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6936 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6937 | && ecs->stop_func_name == NULL |
2afb61aa | 6938 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6939 | { |
4100594e | 6940 | infrun_log_debug ("stepped into undebuggable function"); |
527159b7 | 6941 | |
1b2bfbb9 | 6942 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6943 | undebuggable function (where there is no debugging information |
6944 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6945 | inferior stopped). Since we want to skip this kind of code, |
6946 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6947 | function - unless the user has asked us not to (via |
6948 | set step-mode) or we no longer know how to get back | |
6949 | to the call site. */ | |
6950 | if (step_stop_if_no_debug | |
c7ce8faa | 6951 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6952 | { |
6953 | /* If we have no line number and the step-stop-if-no-debug | |
6954 | is set, we stop the step so that the user has a chance to | |
6955 | switch in assembly mode. */ | |
bdc36728 | 6956 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6957 | return; |
6958 | } | |
6959 | else | |
6960 | { | |
6961 | /* Set a breakpoint at callee's return address (the address | |
6962 | at which the caller will resume). */ | |
568d6575 | 6963 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
6964 | keep_going (ecs); |
6965 | return; | |
6966 | } | |
6967 | } | |
6968 | ||
16c381f0 | 6969 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
6970 | { |
6971 | /* It is stepi or nexti. We always want to stop stepping after | |
6972 | one instruction. */ | |
4100594e | 6973 | infrun_log_debug ("stepi/nexti"); |
bdc36728 | 6974 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6975 | return; |
6976 | } | |
6977 | ||
2afb61aa | 6978 | if (stop_pc_sal.line == 0) |
488f131b JB |
6979 | { |
6980 | /* We have no line number information. That means to stop | |
6981 | stepping (does this always happen right after one instruction, | |
6982 | when we do "s" in a function with no line numbers, | |
6983 | or can this happen as a result of a return or longjmp?). */ | |
4100594e | 6984 | infrun_log_debug ("line number info"); |
bdc36728 | 6985 | end_stepping_range (ecs); |
488f131b JB |
6986 | return; |
6987 | } | |
c906108c | 6988 | |
edb3359d DJ |
6989 | /* Look for "calls" to inlined functions, part one. If the inline |
6990 | frame machinery detected some skipped call sites, we have entered | |
6991 | a new inline function. */ | |
6992 | ||
6993 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 6994 | ecs->event_thread->control.step_frame_id) |
00431a78 | 6995 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 6996 | { |
4100594e | 6997 | infrun_log_debug ("stepped into inlined function"); |
edb3359d | 6998 | |
51abb421 | 6999 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 7000 | |
16c381f0 | 7001 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
7002 | { |
7003 | /* For "step", we're going to stop. But if the call site | |
7004 | for this inlined function is on the same source line as | |
7005 | we were previously stepping, go down into the function | |
7006 | first. Otherwise stop at the call site. */ | |
7007 | ||
7008 | if (call_sal.line == ecs->event_thread->current_line | |
7009 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7010 | { |
7011 | step_into_inline_frame (ecs->event_thread); | |
7012 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7013 | { | |
7014 | keep_going (ecs); | |
7015 | return; | |
7016 | } | |
7017 | } | |
edb3359d | 7018 | |
bdc36728 | 7019 | end_stepping_range (ecs); |
edb3359d DJ |
7020 | return; |
7021 | } | |
7022 | else | |
7023 | { | |
7024 | /* For "next", we should stop at the call site if it is on a | |
7025 | different source line. Otherwise continue through the | |
7026 | inlined function. */ | |
7027 | if (call_sal.line == ecs->event_thread->current_line | |
7028 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7029 | keep_going (ecs); | |
7030 | else | |
bdc36728 | 7031 | end_stepping_range (ecs); |
edb3359d DJ |
7032 | return; |
7033 | } | |
7034 | } | |
7035 | ||
7036 | /* Look for "calls" to inlined functions, part two. If we are still | |
7037 | in the same real function we were stepping through, but we have | |
7038 | to go further up to find the exact frame ID, we are stepping | |
7039 | through a more inlined call beyond its call site. */ | |
7040 | ||
7041 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
7042 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7043 | ecs->event_thread->control.step_frame_id) |
edb3359d | 7044 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7045 | ecs->event_thread->control.step_frame_id)) |
edb3359d | 7046 | { |
4100594e | 7047 | infrun_log_debug ("stepping through inlined function"); |
edb3359d | 7048 | |
4a4c04f1 BE |
7049 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7050 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7051 | keep_going (ecs); |
7052 | else | |
bdc36728 | 7053 | end_stepping_range (ecs); |
edb3359d DJ |
7054 | return; |
7055 | } | |
7056 | ||
8c95582d | 7057 | bool refresh_step_info = true; |
f2ffa92b | 7058 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
7059 | && (ecs->event_thread->current_line != stop_pc_sal.line |
7060 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b | 7061 | { |
8c95582d AB |
7062 | if (stop_pc_sal.is_stmt) |
7063 | { | |
7064 | /* We are at the start of a different line. So stop. Note that | |
7065 | we don't stop if we step into the middle of a different line. | |
7066 | That is said to make things like for (;;) statements work | |
7067 | better. */ | |
4100594e | 7068 | infrun_log_debug ("infrun: stepped to a different line\n"); |
8c95582d AB |
7069 | end_stepping_range (ecs); |
7070 | return; | |
7071 | } | |
7072 | else if (frame_id_eq (get_frame_id (get_current_frame ()), | |
7073 | ecs->event_thread->control.step_frame_id)) | |
7074 | { | |
7075 | /* We are at the start of a different line, however, this line is | |
7076 | not marked as a statement, and we have not changed frame. We | |
7077 | ignore this line table entry, and continue stepping forward, | |
7078 | looking for a better place to stop. */ | |
7079 | refresh_step_info = false; | |
4100594e SM |
7080 | infrun_log_debug ("infrun: stepped to a different line, but " |
7081 | "it's not the start of a statement\n"); | |
8c95582d | 7082 | } |
488f131b | 7083 | } |
c906108c | 7084 | |
488f131b | 7085 | /* We aren't done stepping. |
c906108c | 7086 | |
488f131b JB |
7087 | Optimize by setting the stepping range to the line. |
7088 | (We might not be in the original line, but if we entered a | |
7089 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7090 | things like for(;;) statements work better.) |
7091 | ||
7092 | If we entered a SAL that indicates a non-statement line table entry, | |
7093 | then we update the stepping range, but we don't update the step info, | |
7094 | which includes things like the line number we are stepping away from. | |
7095 | This means we will stop when we find a line table entry that is marked | |
7096 | as is-statement, even if it matches the non-statement one we just | |
7097 | stepped into. */ | |
c906108c | 7098 | |
16c381f0 JK |
7099 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7100 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7101 | ecs->event_thread->control.may_range_step = 1; |
8c95582d AB |
7102 | if (refresh_step_info) |
7103 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7104 | |
4100594e | 7105 | infrun_log_debug ("keep going"); |
488f131b | 7106 | keep_going (ecs); |
104c1213 JM |
7107 | } |
7108 | ||
c447ac0b PA |
7109 | /* In all-stop mode, if we're currently stepping but have stopped in |
7110 | some other thread, we may need to switch back to the stepped | |
7111 | thread. Returns true we set the inferior running, false if we left | |
7112 | it stopped (and the event needs further processing). */ | |
7113 | ||
7114 | static int | |
7115 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
7116 | { | |
fbea99ea | 7117 | if (!target_is_non_stop_p ()) |
c447ac0b | 7118 | { |
99619bea PA |
7119 | struct thread_info *stepping_thread; |
7120 | ||
7121 | /* If any thread is blocked on some internal breakpoint, and we | |
7122 | simply need to step over that breakpoint to get it going | |
7123 | again, do that first. */ | |
7124 | ||
7125 | /* However, if we see an event for the stepping thread, then we | |
7126 | know all other threads have been moved past their breakpoints | |
7127 | already. Let the caller check whether the step is finished, | |
7128 | etc., before deciding to move it past a breakpoint. */ | |
7129 | if (ecs->event_thread->control.step_range_end != 0) | |
7130 | return 0; | |
7131 | ||
7132 | /* Check if the current thread is blocked on an incomplete | |
7133 | step-over, interrupted by a random signal. */ | |
7134 | if (ecs->event_thread->control.trap_expected | |
7135 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7136 | { |
4100594e SM |
7137 | infrun_log_debug ("need to finish step-over of [%s]", |
7138 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
99619bea PA |
7139 | keep_going (ecs); |
7140 | return 1; | |
7141 | } | |
2adfaa28 | 7142 | |
99619bea PA |
7143 | /* Check if the current thread is blocked by a single-step |
7144 | breakpoint of another thread. */ | |
7145 | if (ecs->hit_singlestep_breakpoint) | |
7146 | { | |
4100594e SM |
7147 | infrun_log_debug ("need to step [%s] over single-step breakpoint", |
7148 | target_pid_to_str (ecs->ptid).c_str ()); | |
99619bea PA |
7149 | keep_going (ecs); |
7150 | return 1; | |
7151 | } | |
7152 | ||
4d9d9d04 PA |
7153 | /* If this thread needs yet another step-over (e.g., stepping |
7154 | through a delay slot), do it first before moving on to | |
7155 | another thread. */ | |
7156 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7157 | { | |
4100594e SM |
7158 | infrun_log_debug |
7159 | ("thread [%s] still needs step-over", | |
7160 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); | |
4d9d9d04 PA |
7161 | keep_going (ecs); |
7162 | return 1; | |
7163 | } | |
70509625 | 7164 | |
483805cf PA |
7165 | /* If scheduler locking applies even if not stepping, there's no |
7166 | need to walk over threads. Above we've checked whether the | |
7167 | current thread is stepping. If some other thread not the | |
7168 | event thread is stepping, then it must be that scheduler | |
7169 | locking is not in effect. */ | |
856e7dd6 | 7170 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
7171 | return 0; |
7172 | ||
4d9d9d04 PA |
7173 | /* Otherwise, we no longer expect a trap in the current thread. |
7174 | Clear the trap_expected flag before switching back -- this is | |
7175 | what keep_going does as well, if we call it. */ | |
7176 | ecs->event_thread->control.trap_expected = 0; | |
7177 | ||
7178 | /* Likewise, clear the signal if it should not be passed. */ | |
7179 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7180 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7181 | ||
7182 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 7183 | step/next/etc. */ |
4d9d9d04 PA |
7184 | if (start_step_over ()) |
7185 | { | |
7186 | prepare_to_wait (ecs); | |
7187 | return 1; | |
7188 | } | |
7189 | ||
7190 | /* Look for the stepping/nexting thread. */ | |
483805cf | 7191 | stepping_thread = NULL; |
4d9d9d04 | 7192 | |
08036331 | 7193 | for (thread_info *tp : all_non_exited_threads ()) |
483805cf | 7194 | { |
f3f8ece4 PA |
7195 | switch_to_thread_no_regs (tp); |
7196 | ||
fbea99ea PA |
7197 | /* Ignore threads of processes the caller is not |
7198 | resuming. */ | |
483805cf | 7199 | if (!sched_multi |
5b6d1e4f PA |
7200 | && (tp->inf->process_target () != ecs->target |
7201 | || tp->inf->pid != ecs->ptid.pid ())) | |
483805cf PA |
7202 | continue; |
7203 | ||
7204 | /* When stepping over a breakpoint, we lock all threads | |
7205 | except the one that needs to move past the breakpoint. | |
7206 | If a non-event thread has this set, the "incomplete | |
7207 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
7208 | if (tp->control.trap_expected) |
7209 | { | |
7210 | internal_error (__FILE__, __LINE__, | |
7211 | "[%s] has inconsistent state: " | |
7212 | "trap_expected=%d\n", | |
a068643d | 7213 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
7214 | tp->control.trap_expected); |
7215 | } | |
483805cf PA |
7216 | |
7217 | /* Did we find the stepping thread? */ | |
7218 | if (tp->control.step_range_end) | |
7219 | { | |
7220 | /* Yep. There should only one though. */ | |
7221 | gdb_assert (stepping_thread == NULL); | |
7222 | ||
7223 | /* The event thread is handled at the top, before we | |
7224 | enter this loop. */ | |
7225 | gdb_assert (tp != ecs->event_thread); | |
7226 | ||
7227 | /* If some thread other than the event thread is | |
7228 | stepping, then scheduler locking can't be in effect, | |
7229 | otherwise we wouldn't have resumed the current event | |
7230 | thread in the first place. */ | |
856e7dd6 | 7231 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
7232 | |
7233 | stepping_thread = tp; | |
7234 | } | |
99619bea PA |
7235 | } |
7236 | ||
483805cf | 7237 | if (stepping_thread != NULL) |
99619bea | 7238 | { |
4100594e | 7239 | infrun_log_debug ("switching back to stepped thread"); |
c447ac0b | 7240 | |
2ac7589c PA |
7241 | if (keep_going_stepped_thread (stepping_thread)) |
7242 | { | |
7243 | prepare_to_wait (ecs); | |
7244 | return 1; | |
7245 | } | |
7246 | } | |
f3f8ece4 PA |
7247 | |
7248 | switch_to_thread (ecs->event_thread); | |
2ac7589c | 7249 | } |
2adfaa28 | 7250 | |
2ac7589c PA |
7251 | return 0; |
7252 | } | |
2adfaa28 | 7253 | |
2ac7589c PA |
7254 | /* Set a previously stepped thread back to stepping. Returns true on |
7255 | success, false if the resume is not possible (e.g., the thread | |
7256 | vanished). */ | |
7257 | ||
7258 | static int | |
7259 | keep_going_stepped_thread (struct thread_info *tp) | |
7260 | { | |
7261 | struct frame_info *frame; | |
2ac7589c PA |
7262 | struct execution_control_state ecss; |
7263 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7264 | |
2ac7589c PA |
7265 | /* If the stepping thread exited, then don't try to switch back and |
7266 | resume it, which could fail in several different ways depending | |
7267 | on the target. Instead, just keep going. | |
2adfaa28 | 7268 | |
2ac7589c PA |
7269 | We can find a stepping dead thread in the thread list in two |
7270 | cases: | |
2adfaa28 | 7271 | |
2ac7589c PA |
7272 | - The target supports thread exit events, and when the target |
7273 | tries to delete the thread from the thread list, inferior_ptid | |
7274 | pointed at the exiting thread. In such case, calling | |
7275 | delete_thread does not really remove the thread from the list; | |
7276 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7277 | |
2ac7589c PA |
7278 | - The target's debug interface does not support thread exit |
7279 | events, and so we have no idea whatsoever if the previously | |
7280 | stepping thread is still alive. For that reason, we need to | |
7281 | synchronously query the target now. */ | |
2adfaa28 | 7282 | |
00431a78 | 7283 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c | 7284 | { |
4100594e SM |
7285 | infrun_log_debug ("not resuming previously stepped thread, it has " |
7286 | "vanished"); | |
2ac7589c | 7287 | |
00431a78 | 7288 | delete_thread (tp); |
2ac7589c | 7289 | return 0; |
c447ac0b | 7290 | } |
2ac7589c | 7291 | |
4100594e | 7292 | infrun_log_debug ("resuming previously stepped thread"); |
2ac7589c PA |
7293 | |
7294 | reset_ecs (ecs, tp); | |
00431a78 | 7295 | switch_to_thread (tp); |
2ac7589c | 7296 | |
f2ffa92b | 7297 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 7298 | frame = get_current_frame (); |
2ac7589c PA |
7299 | |
7300 | /* If the PC of the thread we were trying to single-step has | |
7301 | changed, then that thread has trapped or been signaled, but the | |
7302 | event has not been reported to GDB yet. Re-poll the target | |
7303 | looking for this particular thread's event (i.e. temporarily | |
7304 | enable schedlock) by: | |
7305 | ||
7306 | - setting a break at the current PC | |
7307 | - resuming that particular thread, only (by setting trap | |
7308 | expected) | |
7309 | ||
7310 | This prevents us continuously moving the single-step breakpoint | |
7311 | forward, one instruction at a time, overstepping. */ | |
7312 | ||
f2ffa92b | 7313 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
7314 | { |
7315 | ptid_t resume_ptid; | |
7316 | ||
4100594e SM |
7317 | infrun_log_debug ("expected thread advanced also (%s -> %s)", |
7318 | paddress (target_gdbarch (), tp->prev_pc), | |
7319 | paddress (target_gdbarch (), tp->suspend.stop_pc)); | |
2ac7589c PA |
7320 | |
7321 | /* Clear the info of the previous step-over, as it's no longer | |
7322 | valid (if the thread was trying to step over a breakpoint, it | |
7323 | has already succeeded). It's what keep_going would do too, | |
7324 | if we called it. Do this before trying to insert the sss | |
7325 | breakpoint, otherwise if we were previously trying to step | |
7326 | over this exact address in another thread, the breakpoint is | |
7327 | skipped. */ | |
7328 | clear_step_over_info (); | |
7329 | tp->control.trap_expected = 0; | |
7330 | ||
7331 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7332 | get_frame_address_space (frame), | |
f2ffa92b | 7333 | tp->suspend.stop_pc); |
2ac7589c | 7334 | |
719546c4 | 7335 | tp->resumed = true; |
fbea99ea | 7336 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7337 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7338 | } | |
7339 | else | |
7340 | { | |
4100594e | 7341 | infrun_log_debug ("expected thread still hasn't advanced"); |
2ac7589c PA |
7342 | |
7343 | keep_going_pass_signal (ecs); | |
7344 | } | |
7345 | return 1; | |
c447ac0b PA |
7346 | } |
7347 | ||
8b061563 PA |
7348 | /* Is thread TP in the middle of (software or hardware) |
7349 | single-stepping? (Note the result of this function must never be | |
7350 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7351 | |
a289b8f6 | 7352 | static int |
b3444185 | 7353 | currently_stepping (struct thread_info *tp) |
a7212384 | 7354 | { |
8358c15c JK |
7355 | return ((tp->control.step_range_end |
7356 | && tp->control.step_resume_breakpoint == NULL) | |
7357 | || tp->control.trap_expected | |
af48d08f | 7358 | || tp->stepped_breakpoint |
8358c15c | 7359 | || bpstat_should_step ()); |
a7212384 UW |
7360 | } |
7361 | ||
b2175913 MS |
7362 | /* Inferior has stepped into a subroutine call with source code that |
7363 | we should not step over. Do step to the first line of code in | |
7364 | it. */ | |
c2c6d25f JM |
7365 | |
7366 | static void | |
568d6575 UW |
7367 | handle_step_into_function (struct gdbarch *gdbarch, |
7368 | struct execution_control_state *ecs) | |
c2c6d25f | 7369 | { |
7e324e48 GB |
7370 | fill_in_stop_func (gdbarch, ecs); |
7371 | ||
f2ffa92b PA |
7372 | compunit_symtab *cust |
7373 | = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); | |
43f3e411 | 7374 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7375 | ecs->stop_func_start |
7376 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7377 | |
51abb421 | 7378 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7379 | /* Use the step_resume_break to step until the end of the prologue, |
7380 | even if that involves jumps (as it seems to on the vax under | |
7381 | 4.2). */ | |
7382 | /* If the prologue ends in the middle of a source line, continue to | |
7383 | the end of that source line (if it is still within the function). | |
7384 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7385 | if (stop_func_sal.end |
7386 | && stop_func_sal.pc != ecs->stop_func_start | |
7387 | && stop_func_sal.end < ecs->stop_func_end) | |
7388 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7389 | |
2dbd5e30 KB |
7390 | /* Architectures which require breakpoint adjustment might not be able |
7391 | to place a breakpoint at the computed address. If so, the test | |
7392 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7393 | ecs->stop_func_start to an address at which a breakpoint may be | |
7394 | legitimately placed. | |
8fb3e588 | 7395 | |
2dbd5e30 KB |
7396 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7397 | made, GDB will enter an infinite loop when stepping through | |
7398 | optimized code consisting of VLIW instructions which contain | |
7399 | subinstructions corresponding to different source lines. On | |
7400 | FR-V, it's not permitted to place a breakpoint on any but the | |
7401 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7402 | set, GDB will adjust the breakpoint address to the beginning of | |
7403 | the VLIW instruction. Thus, we need to make the corresponding | |
7404 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7405 | |
568d6575 | 7406 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7407 | { |
7408 | ecs->stop_func_start | |
568d6575 | 7409 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7410 | ecs->stop_func_start); |
2dbd5e30 KB |
7411 | } |
7412 | ||
f2ffa92b | 7413 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7414 | { |
7415 | /* We are already there: stop now. */ | |
bdc36728 | 7416 | end_stepping_range (ecs); |
c2c6d25f JM |
7417 | return; |
7418 | } | |
7419 | else | |
7420 | { | |
7421 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7422 | symtab_and_line sr_sal; |
c2c6d25f JM |
7423 | sr_sal.pc = ecs->stop_func_start; |
7424 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7425 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7426 | |
c2c6d25f | 7427 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7428 | some machines the prologue is where the new fp value is |
7429 | established. */ | |
a6d9a66e | 7430 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7431 | |
7432 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7433 | ecs->event_thread->control.step_range_end |
7434 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7435 | } |
7436 | keep_going (ecs); | |
7437 | } | |
d4f3574e | 7438 | |
b2175913 MS |
7439 | /* Inferior has stepped backward into a subroutine call with source |
7440 | code that we should not step over. Do step to the beginning of the | |
7441 | last line of code in it. */ | |
7442 | ||
7443 | static void | |
568d6575 UW |
7444 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7445 | struct execution_control_state *ecs) | |
b2175913 | 7446 | { |
43f3e411 | 7447 | struct compunit_symtab *cust; |
167e4384 | 7448 | struct symtab_and_line stop_func_sal; |
b2175913 | 7449 | |
7e324e48 GB |
7450 | fill_in_stop_func (gdbarch, ecs); |
7451 | ||
f2ffa92b | 7452 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7453 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7454 | ecs->stop_func_start |
7455 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7456 | |
f2ffa92b | 7457 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7458 | |
7459 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7460 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7461 | { |
7462 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7463 | end_stepping_range (ecs); |
b2175913 MS |
7464 | } |
7465 | else | |
7466 | { | |
7467 | /* Else just reset the step range and keep going. | |
7468 | No step-resume breakpoint, they don't work for | |
7469 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7470 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7471 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7472 | keep_going (ecs); |
7473 | } | |
7474 | return; | |
7475 | } | |
7476 | ||
d3169d93 | 7477 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7478 | This is used to both functions and to skip over code. */ |
7479 | ||
7480 | static void | |
2c03e5be PA |
7481 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7482 | struct symtab_and_line sr_sal, | |
7483 | struct frame_id sr_id, | |
7484 | enum bptype sr_type) | |
44cbf7b5 | 7485 | { |
611c83ae PA |
7486 | /* There should never be more than one step-resume or longjmp-resume |
7487 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7488 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7489 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7490 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 | 7491 | |
4100594e SM |
7492 | infrun_log_debug ("inserting step-resume breakpoint at %s", |
7493 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7494 | |
8358c15c | 7495 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7496 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7497 | } |
7498 | ||
9da8c2a0 | 7499 | void |
2c03e5be PA |
7500 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7501 | struct symtab_and_line sr_sal, | |
7502 | struct frame_id sr_id) | |
7503 | { | |
7504 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7505 | sr_sal, sr_id, | |
7506 | bp_step_resume); | |
44cbf7b5 | 7507 | } |
7ce450bd | 7508 | |
2c03e5be PA |
7509 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7510 | This is used to skip a potential signal handler. | |
7ce450bd | 7511 | |
14e60db5 DJ |
7512 | This is called with the interrupted function's frame. The signal |
7513 | handler, when it returns, will resume the interrupted function at | |
7514 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7515 | |
7516 | static void | |
2c03e5be | 7517 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7518 | { |
f4c1edd8 | 7519 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7520 | |
51abb421 PA |
7521 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7522 | ||
7523 | symtab_and_line sr_sal; | |
568d6575 | 7524 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7525 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7526 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7527 | |
2c03e5be PA |
7528 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7529 | get_stack_frame_id (return_frame), | |
7530 | bp_hp_step_resume); | |
d303a6c7 AC |
7531 | } |
7532 | ||
2c03e5be PA |
7533 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7534 | is used to skip a function after stepping into it (for "next" or if | |
7535 | the called function has no debugging information). | |
14e60db5 DJ |
7536 | |
7537 | The current function has almost always been reached by single | |
7538 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7539 | current function, and the breakpoint will be set at the caller's | |
7540 | resume address. | |
7541 | ||
7542 | This is a separate function rather than reusing | |
2c03e5be | 7543 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7544 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7545 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7546 | |
7547 | static void | |
7548 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7549 | { | |
14e60db5 DJ |
7550 | /* We shouldn't have gotten here if we don't know where the call site |
7551 | is. */ | |
c7ce8faa | 7552 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7553 | |
51abb421 | 7554 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7555 | |
51abb421 | 7556 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7557 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7558 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7559 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7560 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7561 | |
a6d9a66e | 7562 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7563 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7564 | } |
7565 | ||
611c83ae PA |
7566 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7567 | new breakpoint at the target of a jmp_buf. The handling of | |
7568 | longjmp-resume uses the same mechanisms used for handling | |
7569 | "step-resume" breakpoints. */ | |
7570 | ||
7571 | static void | |
a6d9a66e | 7572 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7573 | { |
e81a37f7 TT |
7574 | /* There should never be more than one longjmp-resume breakpoint per |
7575 | thread, so we should never be setting a new | |
611c83ae | 7576 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7577 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae | 7578 | |
4100594e SM |
7579 | infrun_log_debug ("inserting longjmp-resume breakpoint at %s", |
7580 | paddress (gdbarch, pc)); | |
611c83ae | 7581 | |
e81a37f7 | 7582 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7583 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7584 | } |
7585 | ||
186c406b TT |
7586 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7587 | the exception. The block B is the block of the unwinder debug hook | |
7588 | function. FRAME is the frame corresponding to the call to this | |
7589 | function. SYM is the symbol of the function argument holding the | |
7590 | target PC of the exception. */ | |
7591 | ||
7592 | static void | |
7593 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7594 | const struct block *b, |
186c406b TT |
7595 | struct frame_info *frame, |
7596 | struct symbol *sym) | |
7597 | { | |
a70b8144 | 7598 | try |
186c406b | 7599 | { |
63e43d3a | 7600 | struct block_symbol vsym; |
186c406b TT |
7601 | struct value *value; |
7602 | CORE_ADDR handler; | |
7603 | struct breakpoint *bp; | |
7604 | ||
987012b8 | 7605 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 7606 | b, VAR_DOMAIN); |
63e43d3a | 7607 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7608 | /* If the value was optimized out, revert to the old behavior. */ |
7609 | if (! value_optimized_out (value)) | |
7610 | { | |
7611 | handler = value_as_address (value); | |
7612 | ||
4100594e SM |
7613 | infrun_log_debug ("exception resume at %lx", |
7614 | (unsigned long) handler); | |
186c406b TT |
7615 | |
7616 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7617 | handler, |
7618 | bp_exception_resume).release (); | |
c70a6932 JK |
7619 | |
7620 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7621 | frame = NULL; | |
7622 | ||
5d5658a1 | 7623 | bp->thread = tp->global_num; |
186c406b TT |
7624 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7625 | } | |
7626 | } | |
230d2906 | 7627 | catch (const gdb_exception_error &e) |
492d29ea PA |
7628 | { |
7629 | /* We want to ignore errors here. */ | |
7630 | } | |
186c406b TT |
7631 | } |
7632 | ||
28106bc2 SDJ |
7633 | /* A helper for check_exception_resume that sets an |
7634 | exception-breakpoint based on a SystemTap probe. */ | |
7635 | ||
7636 | static void | |
7637 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7638 | const struct bound_probe *probe, |
28106bc2 SDJ |
7639 | struct frame_info *frame) |
7640 | { | |
7641 | struct value *arg_value; | |
7642 | CORE_ADDR handler; | |
7643 | struct breakpoint *bp; | |
7644 | ||
7645 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7646 | if (!arg_value) | |
7647 | return; | |
7648 | ||
7649 | handler = value_as_address (arg_value); | |
7650 | ||
4100594e SM |
7651 | infrun_log_debug ("exception resume at %s", |
7652 | paddress (probe->objfile->arch (), handler)); | |
28106bc2 SDJ |
7653 | |
7654 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7655 | handler, bp_exception_resume).release (); |
5d5658a1 | 7656 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7657 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7658 | } | |
7659 | ||
186c406b TT |
7660 | /* This is called when an exception has been intercepted. Check to |
7661 | see whether the exception's destination is of interest, and if so, | |
7662 | set an exception resume breakpoint there. */ | |
7663 | ||
7664 | static void | |
7665 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7666 | struct frame_info *frame) |
186c406b | 7667 | { |
729662a5 | 7668 | struct bound_probe probe; |
28106bc2 SDJ |
7669 | struct symbol *func; |
7670 | ||
7671 | /* First see if this exception unwinding breakpoint was set via a | |
7672 | SystemTap probe point. If so, the probe has two arguments: the | |
7673 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7674 | set a breakpoint there. */ | |
6bac7473 | 7675 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7676 | if (probe.prob) |
28106bc2 | 7677 | { |
729662a5 | 7678 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7679 | return; |
7680 | } | |
7681 | ||
7682 | func = get_frame_function (frame); | |
7683 | if (!func) | |
7684 | return; | |
186c406b | 7685 | |
a70b8144 | 7686 | try |
186c406b | 7687 | { |
3977b71f | 7688 | const struct block *b; |
8157b174 | 7689 | struct block_iterator iter; |
186c406b TT |
7690 | struct symbol *sym; |
7691 | int argno = 0; | |
7692 | ||
7693 | /* The exception breakpoint is a thread-specific breakpoint on | |
7694 | the unwinder's debug hook, declared as: | |
7695 | ||
7696 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7697 | ||
7698 | The CFA argument indicates the frame to which control is | |
7699 | about to be transferred. HANDLER is the destination PC. | |
7700 | ||
7701 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7702 | This is not extremely efficient but it avoids issues in gdb | |
7703 | with computing the DWARF CFA, and it also works even in weird | |
7704 | cases such as throwing an exception from inside a signal | |
7705 | handler. */ | |
7706 | ||
7707 | b = SYMBOL_BLOCK_VALUE (func); | |
7708 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7709 | { | |
7710 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7711 | continue; | |
7712 | ||
7713 | if (argno == 0) | |
7714 | ++argno; | |
7715 | else | |
7716 | { | |
7717 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7718 | b, frame, sym); | |
7719 | break; | |
7720 | } | |
7721 | } | |
7722 | } | |
230d2906 | 7723 | catch (const gdb_exception_error &e) |
492d29ea PA |
7724 | { |
7725 | } | |
186c406b TT |
7726 | } |
7727 | ||
104c1213 | 7728 | static void |
22bcd14b | 7729 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7730 | { |
4100594e | 7731 | infrun_log_debug ("stop_waiting"); |
527159b7 | 7732 | |
cd0fc7c3 SS |
7733 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7734 | ecs->wait_some_more = 0; | |
fbea99ea | 7735 | |
53cccef1 | 7736 | /* If all-stop, but there exists a non-stop target, stop all |
fbea99ea | 7737 | threads now that we're presenting the stop to the user. */ |
53cccef1 | 7738 | if (!non_stop && exists_non_stop_target ()) |
fbea99ea | 7739 | stop_all_threads (); |
cd0fc7c3 SS |
7740 | } |
7741 | ||
4d9d9d04 PA |
7742 | /* Like keep_going, but passes the signal to the inferior, even if the |
7743 | signal is set to nopass. */ | |
d4f3574e SS |
7744 | |
7745 | static void | |
4d9d9d04 | 7746 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7747 | { |
d7e15655 | 7748 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 7749 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7750 | |
d4f3574e | 7751 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 7752 | ecs->event_thread->prev_pc |
fc75c28b | 7753 | = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 7754 | |
4d9d9d04 | 7755 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7756 | { |
4d9d9d04 PA |
7757 | struct thread_info *tp = ecs->event_thread; |
7758 | ||
4100594e SM |
7759 | infrun_log_debug ("%s has trap_expected set, " |
7760 | "resuming to collect trap", | |
7761 | target_pid_to_str (tp->ptid).c_str ()); | |
4d9d9d04 | 7762 | |
a9ba6bae PA |
7763 | /* We haven't yet gotten our trap, and either: intercepted a |
7764 | non-signal event (e.g., a fork); or took a signal which we | |
7765 | are supposed to pass through to the inferior. Simply | |
7766 | continue. */ | |
64ce06e4 | 7767 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7768 | } |
372316f1 PA |
7769 | else if (step_over_info_valid_p ()) |
7770 | { | |
7771 | /* Another thread is stepping over a breakpoint in-line. If | |
7772 | this thread needs a step-over too, queue the request. In | |
7773 | either case, this resume must be deferred for later. */ | |
7774 | struct thread_info *tp = ecs->event_thread; | |
7775 | ||
7776 | if (ecs->hit_singlestep_breakpoint | |
7777 | || thread_still_needs_step_over (tp)) | |
7778 | { | |
4100594e SM |
7779 | infrun_log_debug ("step-over already in progress: " |
7780 | "step-over for %s deferred", | |
7781 | target_pid_to_str (tp->ptid).c_str ()); | |
bb88694d | 7782 | global_thread_step_over_chain_enqueue (tp); |
372316f1 PA |
7783 | } |
7784 | else | |
7785 | { | |
4100594e SM |
7786 | infrun_log_debug ("step-over in progress: resume of %s deferred", |
7787 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 | 7788 | } |
372316f1 | 7789 | } |
d4f3574e SS |
7790 | else |
7791 | { | |
31e77af2 | 7792 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7793 | int remove_bp; |
7794 | int remove_wps; | |
8d297bbf | 7795 | step_over_what step_what; |
31e77af2 | 7796 | |
d4f3574e | 7797 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7798 | anyway (if we got a signal, the user asked it be passed to |
7799 | the child) | |
7800 | -- or -- | |
7801 | We got our expected trap, but decided we should resume from | |
7802 | it. | |
d4f3574e | 7803 | |
a9ba6bae | 7804 | We're going to run this baby now! |
d4f3574e | 7805 | |
c36b740a VP |
7806 | Note that insert_breakpoints won't try to re-insert |
7807 | already inserted breakpoints. Therefore, we don't | |
7808 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7809 | |
31e77af2 PA |
7810 | /* If we need to step over a breakpoint, and we're not using |
7811 | displaced stepping to do so, insert all breakpoints | |
7812 | (watchpoints, etc.) but the one we're stepping over, step one | |
7813 | instruction, and then re-insert the breakpoint when that step | |
7814 | is finished. */ | |
963f9c80 | 7815 | |
6c4cfb24 PA |
7816 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7817 | ||
963f9c80 | 7818 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7819 | || (step_what & STEP_OVER_BREAKPOINT)); |
7820 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7821 | |
cb71640d PA |
7822 | /* We can't use displaced stepping if we need to step past a |
7823 | watchpoint. The instruction copied to the scratch pad would | |
7824 | still trigger the watchpoint. */ | |
7825 | if (remove_bp | |
3fc8eb30 | 7826 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7827 | { |
a01bda52 | 7828 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
7829 | regcache_read_pc (regcache), remove_wps, |
7830 | ecs->event_thread->global_num); | |
45e8c884 | 7831 | } |
963f9c80 | 7832 | else if (remove_wps) |
21edc42f | 7833 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
7834 | |
7835 | /* If we now need to do an in-line step-over, we need to stop | |
7836 | all other threads. Note this must be done before | |
7837 | insert_breakpoints below, because that removes the breakpoint | |
7838 | we're about to step over, otherwise other threads could miss | |
7839 | it. */ | |
fbea99ea | 7840 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7841 | stop_all_threads (); |
abbb1732 | 7842 | |
31e77af2 | 7843 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 7844 | try |
31e77af2 PA |
7845 | { |
7846 | insert_breakpoints (); | |
7847 | } | |
230d2906 | 7848 | catch (const gdb_exception_error &e) |
31e77af2 PA |
7849 | { |
7850 | exception_print (gdb_stderr, e); | |
22bcd14b | 7851 | stop_waiting (ecs); |
bdf2a94a | 7852 | clear_step_over_info (); |
31e77af2 | 7853 | return; |
d4f3574e SS |
7854 | } |
7855 | ||
963f9c80 | 7856 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7857 | |
64ce06e4 | 7858 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7859 | } |
7860 | ||
488f131b | 7861 | prepare_to_wait (ecs); |
d4f3574e SS |
7862 | } |
7863 | ||
4d9d9d04 PA |
7864 | /* Called when we should continue running the inferior, because the |
7865 | current event doesn't cause a user visible stop. This does the | |
7866 | resuming part; waiting for the next event is done elsewhere. */ | |
7867 | ||
7868 | static void | |
7869 | keep_going (struct execution_control_state *ecs) | |
7870 | { | |
7871 | if (ecs->event_thread->control.trap_expected | |
7872 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7873 | ecs->event_thread->control.trap_expected = 0; | |
7874 | ||
7875 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7876 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7877 | keep_going_pass_signal (ecs); | |
7878 | } | |
7879 | ||
104c1213 JM |
7880 | /* This function normally comes after a resume, before |
7881 | handle_inferior_event exits. It takes care of any last bits of | |
7882 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7883 | |
104c1213 JM |
7884 | static void |
7885 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7886 | { |
4100594e | 7887 | infrun_log_debug ("prepare_to_wait"); |
104c1213 | 7888 | |
104c1213 | 7889 | ecs->wait_some_more = 1; |
0b333c5e PA |
7890 | |
7891 | if (!target_is_async_p ()) | |
7892 | mark_infrun_async_event_handler (); | |
c906108c | 7893 | } |
11cf8741 | 7894 | |
fd664c91 | 7895 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7896 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7897 | |
7898 | static void | |
bdc36728 | 7899 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7900 | { |
bdc36728 | 7901 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7902 | stop_waiting (ecs); |
fd664c91 PA |
7903 | } |
7904 | ||
33d62d64 JK |
7905 | /* Several print_*_reason functions to print why the inferior has stopped. |
7906 | We always print something when the inferior exits, or receives a signal. | |
7907 | The rest of the cases are dealt with later on in normal_stop and | |
7908 | print_it_typical. Ideally there should be a call to one of these | |
7909 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7910 | stop_waiting is called. |
33d62d64 | 7911 | |
fd664c91 PA |
7912 | Note that we don't call these directly, instead we delegate that to |
7913 | the interpreters, through observers. Interpreters then call these | |
7914 | with whatever uiout is right. */ | |
33d62d64 | 7915 | |
fd664c91 PA |
7916 | void |
7917 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7918 | { |
fd664c91 | 7919 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7920 | |
112e8700 | 7921 | if (uiout->is_mi_like_p ()) |
fd664c91 | 7922 | { |
112e8700 | 7923 | uiout->field_string ("reason", |
fd664c91 PA |
7924 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
7925 | } | |
7926 | } | |
33d62d64 | 7927 | |
fd664c91 PA |
7928 | void |
7929 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7930 | { |
33d62d64 | 7931 | annotate_signalled (); |
112e8700 SM |
7932 | if (uiout->is_mi_like_p ()) |
7933 | uiout->field_string | |
7934 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7935 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 7936 | annotate_signal_name (); |
112e8700 | 7937 | uiout->field_string ("signal-name", |
2ea28649 | 7938 | gdb_signal_to_name (siggnal)); |
33d62d64 | 7939 | annotate_signal_name_end (); |
112e8700 | 7940 | uiout->text (", "); |
33d62d64 | 7941 | annotate_signal_string (); |
112e8700 | 7942 | uiout->field_string ("signal-meaning", |
2ea28649 | 7943 | gdb_signal_to_string (siggnal)); |
33d62d64 | 7944 | annotate_signal_string_end (); |
112e8700 SM |
7945 | uiout->text (".\n"); |
7946 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
7947 | } |
7948 | ||
fd664c91 PA |
7949 | void |
7950 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 7951 | { |
fda326dd | 7952 | struct inferior *inf = current_inferior (); |
a068643d | 7953 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 7954 | |
33d62d64 JK |
7955 | annotate_exited (exitstatus); |
7956 | if (exitstatus) | |
7957 | { | |
112e8700 SM |
7958 | if (uiout->is_mi_like_p ()) |
7959 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
7960 | std::string exit_code_str |
7961 | = string_printf ("0%o", (unsigned int) exitstatus); | |
7962 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
7963 | plongest (inf->num), pidstr.c_str (), | |
7964 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
7965 | } |
7966 | else | |
11cf8741 | 7967 | { |
112e8700 SM |
7968 | if (uiout->is_mi_like_p ()) |
7969 | uiout->field_string | |
7970 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
7971 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
7972 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 7973 | } |
33d62d64 JK |
7974 | } |
7975 | ||
012b3a21 WT |
7976 | /* Some targets/architectures can do extra processing/display of |
7977 | segmentation faults. E.g., Intel MPX boundary faults. | |
7978 | Call the architecture dependent function to handle the fault. */ | |
7979 | ||
7980 | static void | |
7981 | handle_segmentation_fault (struct ui_out *uiout) | |
7982 | { | |
7983 | struct regcache *regcache = get_current_regcache (); | |
ac7936df | 7984 | struct gdbarch *gdbarch = regcache->arch (); |
012b3a21 WT |
7985 | |
7986 | if (gdbarch_handle_segmentation_fault_p (gdbarch)) | |
7987 | gdbarch_handle_segmentation_fault (gdbarch, uiout); | |
7988 | } | |
7989 | ||
fd664c91 PA |
7990 | void |
7991 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 7992 | { |
f303dbd6 PA |
7993 | struct thread_info *thr = inferior_thread (); |
7994 | ||
33d62d64 JK |
7995 | annotate_signal (); |
7996 | ||
112e8700 | 7997 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
7998 | ; |
7999 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 8000 | { |
f303dbd6 | 8001 | const char *name; |
33d62d64 | 8002 | |
112e8700 | 8003 | uiout->text ("\nThread "); |
33eca680 | 8004 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 PA |
8005 | |
8006 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
8007 | if (name != NULL) | |
8008 | { | |
112e8700 | 8009 | uiout->text (" \""); |
33eca680 | 8010 | uiout->field_string ("name", name); |
112e8700 | 8011 | uiout->text ("\""); |
f303dbd6 | 8012 | } |
33d62d64 | 8013 | } |
f303dbd6 | 8014 | else |
112e8700 | 8015 | uiout->text ("\nProgram"); |
f303dbd6 | 8016 | |
112e8700 SM |
8017 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8018 | uiout->text (" stopped"); | |
33d62d64 JK |
8019 | else |
8020 | { | |
112e8700 | 8021 | uiout->text (" received signal "); |
8b93c638 | 8022 | annotate_signal_name (); |
112e8700 SM |
8023 | if (uiout->is_mi_like_p ()) |
8024 | uiout->field_string | |
8025 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8026 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8027 | annotate_signal_name_end (); |
112e8700 | 8028 | uiout->text (", "); |
8b93c638 | 8029 | annotate_signal_string (); |
112e8700 | 8030 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 WT |
8031 | |
8032 | if (siggnal == GDB_SIGNAL_SEGV) | |
8033 | handle_segmentation_fault (uiout); | |
8034 | ||
8b93c638 | 8035 | annotate_signal_string_end (); |
33d62d64 | 8036 | } |
112e8700 | 8037 | uiout->text (".\n"); |
33d62d64 | 8038 | } |
252fbfc8 | 8039 | |
fd664c91 PA |
8040 | void |
8041 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8042 | { |
112e8700 | 8043 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8044 | } |
43ff13b4 | 8045 | |
0c7e1a46 PA |
8046 | /* Print current location without a level number, if we have changed |
8047 | functions or hit a breakpoint. Print source line if we have one. | |
8048 | bpstat_print contains the logic deciding in detail what to print, | |
8049 | based on the event(s) that just occurred. */ | |
8050 | ||
243a9253 PA |
8051 | static void |
8052 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8053 | { |
8054 | int bpstat_ret; | |
f486487f | 8055 | enum print_what source_flag; |
0c7e1a46 PA |
8056 | int do_frame_printing = 1; |
8057 | struct thread_info *tp = inferior_thread (); | |
8058 | ||
8059 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8060 | switch (bpstat_ret) | |
8061 | { | |
8062 | case PRINT_UNKNOWN: | |
8063 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8064 | should) carry around the function and does (or should) use | |
8065 | that when doing a frame comparison. */ | |
8066 | if (tp->control.stop_step | |
8067 | && frame_id_eq (tp->control.step_frame_id, | |
8068 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
8069 | && (tp->control.step_start_function |
8070 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
8071 | { |
8072 | /* Finished step, just print source line. */ | |
8073 | source_flag = SRC_LINE; | |
8074 | } | |
8075 | else | |
8076 | { | |
8077 | /* Print location and source line. */ | |
8078 | source_flag = SRC_AND_LOC; | |
8079 | } | |
8080 | break; | |
8081 | case PRINT_SRC_AND_LOC: | |
8082 | /* Print location and source line. */ | |
8083 | source_flag = SRC_AND_LOC; | |
8084 | break; | |
8085 | case PRINT_SRC_ONLY: | |
8086 | source_flag = SRC_LINE; | |
8087 | break; | |
8088 | case PRINT_NOTHING: | |
8089 | /* Something bogus. */ | |
8090 | source_flag = SRC_LINE; | |
8091 | do_frame_printing = 0; | |
8092 | break; | |
8093 | default: | |
8094 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8095 | } | |
8096 | ||
8097 | /* The behavior of this routine with respect to the source | |
8098 | flag is: | |
8099 | SRC_LINE: Print only source line | |
8100 | LOCATION: Print only location | |
8101 | SRC_AND_LOC: Print location and source line. */ | |
8102 | if (do_frame_printing) | |
8103 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8104 | } |
8105 | ||
243a9253 PA |
8106 | /* See infrun.h. */ |
8107 | ||
8108 | void | |
4c7d57e7 | 8109 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8110 | { |
243a9253 | 8111 | struct target_waitstatus last; |
243a9253 PA |
8112 | struct thread_info *tp; |
8113 | ||
5b6d1e4f | 8114 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8115 | |
67ad9399 TT |
8116 | { |
8117 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8118 | |
67ad9399 | 8119 | print_stop_location (&last); |
243a9253 | 8120 | |
67ad9399 | 8121 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8122 | if (displays) |
8123 | do_displays (); | |
67ad9399 | 8124 | } |
243a9253 PA |
8125 | |
8126 | tp = inferior_thread (); | |
8127 | if (tp->thread_fsm != NULL | |
46e3ed7f | 8128 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
8129 | { |
8130 | struct return_value_info *rv; | |
8131 | ||
46e3ed7f | 8132 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
8133 | if (rv != NULL) |
8134 | print_return_value (uiout, rv); | |
8135 | } | |
0c7e1a46 PA |
8136 | } |
8137 | ||
388a7084 PA |
8138 | /* See infrun.h. */ |
8139 | ||
8140 | void | |
8141 | maybe_remove_breakpoints (void) | |
8142 | { | |
8143 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
8144 | { | |
8145 | if (remove_breakpoints ()) | |
8146 | { | |
223ffa71 | 8147 | target_terminal::ours_for_output (); |
388a7084 PA |
8148 | printf_filtered (_("Cannot remove breakpoints because " |
8149 | "program is no longer writable.\nFurther " | |
8150 | "execution is probably impossible.\n")); | |
8151 | } | |
8152 | } | |
8153 | } | |
8154 | ||
4c2f2a79 PA |
8155 | /* The execution context that just caused a normal stop. */ |
8156 | ||
8157 | struct stop_context | |
8158 | { | |
2d844eaf TT |
8159 | stop_context (); |
8160 | ~stop_context (); | |
8161 | ||
8162 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8163 | ||
8164 | bool changed () const; | |
8165 | ||
4c2f2a79 PA |
8166 | /* The stop ID. */ |
8167 | ULONGEST stop_id; | |
c906108c | 8168 | |
4c2f2a79 | 8169 | /* The event PTID. */ |
c906108c | 8170 | |
4c2f2a79 PA |
8171 | ptid_t ptid; |
8172 | ||
8173 | /* If stopp for a thread event, this is the thread that caused the | |
8174 | stop. */ | |
8175 | struct thread_info *thread; | |
8176 | ||
8177 | /* The inferior that caused the stop. */ | |
8178 | int inf_num; | |
8179 | }; | |
8180 | ||
2d844eaf | 8181 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8182 | takes a strong reference to the thread. */ |
8183 | ||
2d844eaf | 8184 | stop_context::stop_context () |
4c2f2a79 | 8185 | { |
2d844eaf TT |
8186 | stop_id = get_stop_id (); |
8187 | ptid = inferior_ptid; | |
8188 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8189 | |
d7e15655 | 8190 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8191 | { |
8192 | /* Take a strong reference so that the thread can't be deleted | |
8193 | yet. */ | |
2d844eaf TT |
8194 | thread = inferior_thread (); |
8195 | thread->incref (); | |
4c2f2a79 PA |
8196 | } |
8197 | else | |
2d844eaf | 8198 | thread = NULL; |
4c2f2a79 PA |
8199 | } |
8200 | ||
8201 | /* Release a stop context previously created with save_stop_context. | |
8202 | Releases the strong reference to the thread as well. */ | |
8203 | ||
2d844eaf | 8204 | stop_context::~stop_context () |
4c2f2a79 | 8205 | { |
2d844eaf TT |
8206 | if (thread != NULL) |
8207 | thread->decref (); | |
4c2f2a79 PA |
8208 | } |
8209 | ||
8210 | /* Return true if the current context no longer matches the saved stop | |
8211 | context. */ | |
8212 | ||
2d844eaf TT |
8213 | bool |
8214 | stop_context::changed () const | |
8215 | { | |
8216 | if (ptid != inferior_ptid) | |
8217 | return true; | |
8218 | if (inf_num != current_inferior ()->num) | |
8219 | return true; | |
8220 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8221 | return true; | |
8222 | if (get_stop_id () != stop_id) | |
8223 | return true; | |
8224 | return false; | |
4c2f2a79 PA |
8225 | } |
8226 | ||
8227 | /* See infrun.h. */ | |
8228 | ||
8229 | int | |
96baa820 | 8230 | normal_stop (void) |
c906108c | 8231 | { |
73b65bb0 | 8232 | struct target_waitstatus last; |
73b65bb0 | 8233 | |
5b6d1e4f | 8234 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8235 | |
4c2f2a79 PA |
8236 | new_stop_id (); |
8237 | ||
29f49a6a PA |
8238 | /* If an exception is thrown from this point on, make sure to |
8239 | propagate GDB's knowledge of the executing state to the | |
8240 | frontend/user running state. A QUIT is an easy exception to see | |
8241 | here, so do this before any filtered output. */ | |
731f534f | 8242 | |
5b6d1e4f | 8243 | ptid_t finish_ptid = null_ptid; |
731f534f | 8244 | |
c35b1492 | 8245 | if (!non_stop) |
5b6d1e4f | 8246 | finish_ptid = minus_one_ptid; |
e1316e60 PA |
8247 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8248 | || last.kind == TARGET_WAITKIND_EXITED) | |
8249 | { | |
8250 | /* On some targets, we may still have live threads in the | |
8251 | inferior when we get a process exit event. E.g., for | |
8252 | "checkpoint", when the current checkpoint/fork exits, | |
8253 | linux-fork.c automatically switches to another fork from | |
8254 | within target_mourn_inferior. */ | |
731f534f | 8255 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8256 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 PA |
8257 | } |
8258 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5b6d1e4f PA |
8259 | finish_ptid = inferior_ptid; |
8260 | ||
8261 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8262 | if (finish_ptid != null_ptid) | |
8263 | { | |
8264 | maybe_finish_thread_state.emplace | |
8265 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8266 | } | |
29f49a6a | 8267 | |
b57bacec PA |
8268 | /* As we're presenting a stop, and potentially removing breakpoints, |
8269 | update the thread list so we can tell whether there are threads | |
8270 | running on the target. With target remote, for example, we can | |
8271 | only learn about new threads when we explicitly update the thread | |
8272 | list. Do this before notifying the interpreters about signal | |
8273 | stops, end of stepping ranges, etc., so that the "new thread" | |
8274 | output is emitted before e.g., "Program received signal FOO", | |
8275 | instead of after. */ | |
8276 | update_thread_list (); | |
8277 | ||
8278 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 8279 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 8280 | |
c906108c SS |
8281 | /* As with the notification of thread events, we want to delay |
8282 | notifying the user that we've switched thread context until | |
8283 | the inferior actually stops. | |
8284 | ||
73b65bb0 DJ |
8285 | There's no point in saying anything if the inferior has exited. |
8286 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8287 | "received a signal". |
8288 | ||
8289 | Also skip saying anything in non-stop mode. In that mode, as we | |
8290 | don't want GDB to switch threads behind the user's back, to avoid | |
8291 | races where the user is typing a command to apply to thread x, | |
8292 | but GDB switches to thread y before the user finishes entering | |
8293 | the command, fetch_inferior_event installs a cleanup to restore | |
8294 | the current thread back to the thread the user had selected right | |
8295 | after this event is handled, so we're not really switching, only | |
8296 | informing of a stop. */ | |
4f8d22e3 | 8297 | if (!non_stop |
731f534f | 8298 | && previous_inferior_ptid != inferior_ptid |
73b65bb0 DJ |
8299 | && target_has_execution |
8300 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8301 | && last.kind != TARGET_WAITKIND_EXITED |
8302 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8303 | { |
0e454242 | 8304 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8305 | { |
223ffa71 | 8306 | target_terminal::ours_for_output (); |
3b12939d | 8307 | printf_filtered (_("[Switching to %s]\n"), |
a068643d | 8308 | target_pid_to_str (inferior_ptid).c_str ()); |
3b12939d PA |
8309 | annotate_thread_changed (); |
8310 | } | |
39f77062 | 8311 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8312 | } |
c906108c | 8313 | |
0e5bf2a8 PA |
8314 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8315 | { | |
0e454242 | 8316 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8317 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8318 | { | |
223ffa71 | 8319 | target_terminal::ours_for_output (); |
3b12939d PA |
8320 | printf_filtered (_("No unwaited-for children left.\n")); |
8321 | } | |
0e5bf2a8 PA |
8322 | } |
8323 | ||
b57bacec | 8324 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8325 | maybe_remove_breakpoints (); |
c906108c | 8326 | |
c906108c SS |
8327 | /* If an auto-display called a function and that got a signal, |
8328 | delete that auto-display to avoid an infinite recursion. */ | |
8329 | ||
8330 | if (stopped_by_random_signal) | |
8331 | disable_current_display (); | |
8332 | ||
0e454242 | 8333 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8334 | { |
8335 | async_enable_stdin (); | |
8336 | } | |
c906108c | 8337 | |
388a7084 | 8338 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8339 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8340 | |
8341 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8342 | and current location is based on that. Handle the case where the | |
8343 | dummy call is returning after being stopped. E.g. the dummy call | |
8344 | previously hit a breakpoint. (If the dummy call returns | |
8345 | normally, we won't reach here.) Do this before the stop hook is | |
8346 | run, so that it doesn't get to see the temporary dummy frame, | |
8347 | which is not where we'll present the stop. */ | |
8348 | if (has_stack_frames ()) | |
8349 | { | |
8350 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8351 | { | |
8352 | /* Pop the empty frame that contains the stack dummy. This | |
8353 | also restores inferior state prior to the call (struct | |
8354 | infcall_suspend_state). */ | |
8355 | struct frame_info *frame = get_current_frame (); | |
8356 | ||
8357 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8358 | frame_pop (frame); | |
8359 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8360 | does which means there's now no selected frame. */ | |
8361 | } | |
8362 | ||
8363 | select_frame (get_current_frame ()); | |
8364 | ||
8365 | /* Set the current source location. */ | |
8366 | set_current_sal_from_frame (get_current_frame ()); | |
8367 | } | |
dd7e2d2b PA |
8368 | |
8369 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8370 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8371 | if (stop_command != NULL) |
8372 | { | |
2d844eaf | 8373 | stop_context saved_context; |
4c2f2a79 | 8374 | |
a70b8144 | 8375 | try |
bf469271 PA |
8376 | { |
8377 | execute_cmd_pre_hook (stop_command); | |
8378 | } | |
230d2906 | 8379 | catch (const gdb_exception &ex) |
bf469271 PA |
8380 | { |
8381 | exception_fprintf (gdb_stderr, ex, | |
8382 | "Error while running hook_stop:\n"); | |
8383 | } | |
4c2f2a79 PA |
8384 | |
8385 | /* If the stop hook resumes the target, then there's no point in | |
8386 | trying to notify about the previous stop; its context is | |
8387 | gone. Likewise if the command switches thread or inferior -- | |
8388 | the observers would print a stop for the wrong | |
8389 | thread/inferior. */ | |
2d844eaf TT |
8390 | if (saved_context.changed ()) |
8391 | return 1; | |
4c2f2a79 | 8392 | } |
dd7e2d2b | 8393 | |
388a7084 PA |
8394 | /* Notify observers about the stop. This is where the interpreters |
8395 | print the stop event. */ | |
d7e15655 | 8396 | if (inferior_ptid != null_ptid) |
76727919 | 8397 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
388a7084 PA |
8398 | stop_print_frame); |
8399 | else | |
76727919 | 8400 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8401 | |
243a9253 PA |
8402 | annotate_stopped (); |
8403 | ||
48844aa6 PA |
8404 | if (target_has_execution) |
8405 | { | |
8406 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
fe726667 PA |
8407 | && last.kind != TARGET_WAITKIND_EXITED |
8408 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8409 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8410 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8411 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8412 | } |
6c95b8df PA |
8413 | |
8414 | /* Try to get rid of automatically added inferiors that are no | |
8415 | longer needed. Keeping those around slows down things linearly. | |
8416 | Note that this never removes the current inferior. */ | |
8417 | prune_inferiors (); | |
4c2f2a79 PA |
8418 | |
8419 | return 0; | |
c906108c | 8420 | } |
c906108c | 8421 | \f |
c5aa993b | 8422 | int |
96baa820 | 8423 | signal_stop_state (int signo) |
c906108c | 8424 | { |
d6b48e9c | 8425 | return signal_stop[signo]; |
c906108c SS |
8426 | } |
8427 | ||
c5aa993b | 8428 | int |
96baa820 | 8429 | signal_print_state (int signo) |
c906108c SS |
8430 | { |
8431 | return signal_print[signo]; | |
8432 | } | |
8433 | ||
c5aa993b | 8434 | int |
96baa820 | 8435 | signal_pass_state (int signo) |
c906108c SS |
8436 | { |
8437 | return signal_program[signo]; | |
8438 | } | |
8439 | ||
2455069d UW |
8440 | static void |
8441 | signal_cache_update (int signo) | |
8442 | { | |
8443 | if (signo == -1) | |
8444 | { | |
a493e3e2 | 8445 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8446 | signal_cache_update (signo); |
8447 | ||
8448 | return; | |
8449 | } | |
8450 | ||
8451 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8452 | && signal_print[signo] == 0 | |
ab04a2af TT |
8453 | && signal_program[signo] == 1 |
8454 | && signal_catch[signo] == 0); | |
2455069d UW |
8455 | } |
8456 | ||
488f131b | 8457 | int |
7bda5e4a | 8458 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8459 | { |
8460 | int ret = signal_stop[signo]; | |
abbb1732 | 8461 | |
d4f3574e | 8462 | signal_stop[signo] = state; |
2455069d | 8463 | signal_cache_update (signo); |
d4f3574e SS |
8464 | return ret; |
8465 | } | |
8466 | ||
488f131b | 8467 | int |
7bda5e4a | 8468 | signal_print_update (int signo, int state) |
d4f3574e SS |
8469 | { |
8470 | int ret = signal_print[signo]; | |
abbb1732 | 8471 | |
d4f3574e | 8472 | signal_print[signo] = state; |
2455069d | 8473 | signal_cache_update (signo); |
d4f3574e SS |
8474 | return ret; |
8475 | } | |
8476 | ||
488f131b | 8477 | int |
7bda5e4a | 8478 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8479 | { |
8480 | int ret = signal_program[signo]; | |
abbb1732 | 8481 | |
d4f3574e | 8482 | signal_program[signo] = state; |
2455069d | 8483 | signal_cache_update (signo); |
d4f3574e SS |
8484 | return ret; |
8485 | } | |
8486 | ||
ab04a2af TT |
8487 | /* Update the global 'signal_catch' from INFO and notify the |
8488 | target. */ | |
8489 | ||
8490 | void | |
8491 | signal_catch_update (const unsigned int *info) | |
8492 | { | |
8493 | int i; | |
8494 | ||
8495 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8496 | signal_catch[i] = info[i] > 0; | |
8497 | signal_cache_update (-1); | |
adc6a863 | 8498 | target_pass_signals (signal_pass); |
ab04a2af TT |
8499 | } |
8500 | ||
c906108c | 8501 | static void |
96baa820 | 8502 | sig_print_header (void) |
c906108c | 8503 | { |
3e43a32a MS |
8504 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8505 | "to program\tDescription\n")); | |
c906108c SS |
8506 | } |
8507 | ||
8508 | static void | |
2ea28649 | 8509 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8510 | { |
2ea28649 | 8511 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8512 | int name_padding = 13 - strlen (name); |
96baa820 | 8513 | |
c906108c SS |
8514 | if (name_padding <= 0) |
8515 | name_padding = 0; | |
8516 | ||
8517 | printf_filtered ("%s", name); | |
488f131b | 8518 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8519 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8520 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8521 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8522 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8523 | } |
8524 | ||
8525 | /* Specify how various signals in the inferior should be handled. */ | |
8526 | ||
8527 | static void | |
0b39b52e | 8528 | handle_command (const char *args, int from_tty) |
c906108c | 8529 | { |
c906108c | 8530 | int digits, wordlen; |
b926417a | 8531 | int sigfirst, siglast; |
2ea28649 | 8532 | enum gdb_signal oursig; |
c906108c | 8533 | int allsigs; |
c906108c SS |
8534 | |
8535 | if (args == NULL) | |
8536 | { | |
e2e0b3e5 | 8537 | error_no_arg (_("signal to handle")); |
c906108c SS |
8538 | } |
8539 | ||
1777feb0 | 8540 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8541 | |
adc6a863 PA |
8542 | const size_t nsigs = GDB_SIGNAL_LAST; |
8543 | unsigned char sigs[nsigs] {}; | |
c906108c | 8544 | |
1777feb0 | 8545 | /* Break the command line up into args. */ |
c906108c | 8546 | |
773a1edc | 8547 | gdb_argv built_argv (args); |
c906108c SS |
8548 | |
8549 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8550 | actions. Signal numbers and signal names may be interspersed with | |
8551 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8552 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8553 | |
773a1edc | 8554 | for (char *arg : built_argv) |
c906108c | 8555 | { |
773a1edc TT |
8556 | wordlen = strlen (arg); |
8557 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8558 | {; |
8559 | } | |
8560 | allsigs = 0; | |
8561 | sigfirst = siglast = -1; | |
8562 | ||
773a1edc | 8563 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8564 | { |
8565 | /* Apply action to all signals except those used by the | |
1777feb0 | 8566 | debugger. Silently skip those. */ |
c906108c SS |
8567 | allsigs = 1; |
8568 | sigfirst = 0; | |
8569 | siglast = nsigs - 1; | |
8570 | } | |
773a1edc | 8571 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8572 | { |
8573 | SET_SIGS (nsigs, sigs, signal_stop); | |
8574 | SET_SIGS (nsigs, sigs, signal_print); | |
8575 | } | |
773a1edc | 8576 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8577 | { |
8578 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8579 | } | |
773a1edc | 8580 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8581 | { |
8582 | SET_SIGS (nsigs, sigs, signal_print); | |
8583 | } | |
773a1edc | 8584 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8585 | { |
8586 | SET_SIGS (nsigs, sigs, signal_program); | |
8587 | } | |
773a1edc | 8588 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8589 | { |
8590 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8591 | } | |
773a1edc | 8592 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8593 | { |
8594 | SET_SIGS (nsigs, sigs, signal_program); | |
8595 | } | |
773a1edc | 8596 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8597 | { |
8598 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8599 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8600 | } | |
773a1edc | 8601 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8602 | { |
8603 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8604 | } | |
8605 | else if (digits > 0) | |
8606 | { | |
8607 | /* It is numeric. The numeric signal refers to our own | |
8608 | internal signal numbering from target.h, not to host/target | |
8609 | signal number. This is a feature; users really should be | |
8610 | using symbolic names anyway, and the common ones like | |
8611 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8612 | ||
8613 | sigfirst = siglast = (int) | |
773a1edc TT |
8614 | gdb_signal_from_command (atoi (arg)); |
8615 | if (arg[digits] == '-') | |
c906108c SS |
8616 | { |
8617 | siglast = (int) | |
773a1edc | 8618 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8619 | } |
8620 | if (sigfirst > siglast) | |
8621 | { | |
1777feb0 | 8622 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8623 | std::swap (sigfirst, siglast); |
c906108c SS |
8624 | } |
8625 | } | |
8626 | else | |
8627 | { | |
773a1edc | 8628 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8629 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8630 | { |
8631 | sigfirst = siglast = (int) oursig; | |
8632 | } | |
8633 | else | |
8634 | { | |
8635 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8636 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8637 | } |
8638 | } | |
8639 | ||
8640 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8641 | which signals to apply actions to. */ |
c906108c | 8642 | |
b926417a | 8643 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8644 | { |
2ea28649 | 8645 | switch ((enum gdb_signal) signum) |
c906108c | 8646 | { |
a493e3e2 PA |
8647 | case GDB_SIGNAL_TRAP: |
8648 | case GDB_SIGNAL_INT: | |
c906108c SS |
8649 | if (!allsigs && !sigs[signum]) |
8650 | { | |
9e2f0ad4 | 8651 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8652 | Are you sure you want to change it? "), |
2ea28649 | 8653 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8654 | { |
8655 | sigs[signum] = 1; | |
8656 | } | |
8657 | else | |
c119e040 | 8658 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8659 | } |
8660 | break; | |
a493e3e2 PA |
8661 | case GDB_SIGNAL_0: |
8662 | case GDB_SIGNAL_DEFAULT: | |
8663 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8664 | /* Make sure that "all" doesn't print these. */ |
8665 | break; | |
8666 | default: | |
8667 | sigs[signum] = 1; | |
8668 | break; | |
8669 | } | |
8670 | } | |
c906108c SS |
8671 | } |
8672 | ||
b926417a | 8673 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8674 | if (sigs[signum]) |
8675 | { | |
2455069d | 8676 | signal_cache_update (-1); |
adc6a863 PA |
8677 | target_pass_signals (signal_pass); |
8678 | target_program_signals (signal_program); | |
c906108c | 8679 | |
3a031f65 PA |
8680 | if (from_tty) |
8681 | { | |
8682 | /* Show the results. */ | |
8683 | sig_print_header (); | |
8684 | for (; signum < nsigs; signum++) | |
8685 | if (sigs[signum]) | |
aead7601 | 8686 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8687 | } |
8688 | ||
8689 | break; | |
8690 | } | |
c906108c SS |
8691 | } |
8692 | ||
de0bea00 MF |
8693 | /* Complete the "handle" command. */ |
8694 | ||
eb3ff9a5 | 8695 | static void |
de0bea00 | 8696 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8697 | completion_tracker &tracker, |
6f937416 | 8698 | const char *text, const char *word) |
de0bea00 | 8699 | { |
de0bea00 MF |
8700 | static const char * const keywords[] = |
8701 | { | |
8702 | "all", | |
8703 | "stop", | |
8704 | "ignore", | |
8705 | "print", | |
8706 | "pass", | |
8707 | "nostop", | |
8708 | "noignore", | |
8709 | "noprint", | |
8710 | "nopass", | |
8711 | NULL, | |
8712 | }; | |
8713 | ||
eb3ff9a5 PA |
8714 | signal_completer (ignore, tracker, text, word); |
8715 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8716 | } |
8717 | ||
2ea28649 PA |
8718 | enum gdb_signal |
8719 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8720 | { |
8721 | if (num >= 1 && num <= 15) | |
2ea28649 | 8722 | return (enum gdb_signal) num; |
ed01b82c PA |
8723 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8724 | Use \"info signals\" for a list of symbolic signals.")); | |
8725 | } | |
8726 | ||
c906108c SS |
8727 | /* Print current contents of the tables set by the handle command. |
8728 | It is possible we should just be printing signals actually used | |
8729 | by the current target (but for things to work right when switching | |
8730 | targets, all signals should be in the signal tables). */ | |
8731 | ||
8732 | static void | |
1d12d88f | 8733 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8734 | { |
2ea28649 | 8735 | enum gdb_signal oursig; |
abbb1732 | 8736 | |
c906108c SS |
8737 | sig_print_header (); |
8738 | ||
8739 | if (signum_exp) | |
8740 | { | |
8741 | /* First see if this is a symbol name. */ | |
2ea28649 | 8742 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8743 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8744 | { |
8745 | /* No, try numeric. */ | |
8746 | oursig = | |
2ea28649 | 8747 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8748 | } |
8749 | sig_print_info (oursig); | |
8750 | return; | |
8751 | } | |
8752 | ||
8753 | printf_filtered ("\n"); | |
8754 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8755 | for (oursig = GDB_SIGNAL_FIRST; |
8756 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8757 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8758 | { |
8759 | QUIT; | |
8760 | ||
a493e3e2 PA |
8761 | if (oursig != GDB_SIGNAL_UNKNOWN |
8762 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8763 | sig_print_info (oursig); |
8764 | } | |
8765 | ||
3e43a32a MS |
8766 | printf_filtered (_("\nUse the \"handle\" command " |
8767 | "to change these tables.\n")); | |
c906108c | 8768 | } |
4aa995e1 PA |
8769 | |
8770 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8771 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8772 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8773 | also dependent on which thread you have selected. |
8774 | ||
8775 | 1. making $_siginfo be an internalvar that creates a new value on | |
8776 | access. | |
8777 | ||
8778 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8779 | ||
8780 | /* This function implements the lval_computed support for reading a | |
8781 | $_siginfo value. */ | |
8782 | ||
8783 | static void | |
8784 | siginfo_value_read (struct value *v) | |
8785 | { | |
8786 | LONGEST transferred; | |
8787 | ||
a911d87a PA |
8788 | /* If we can access registers, so can we access $_siginfo. Likewise |
8789 | vice versa. */ | |
8790 | validate_registers_access (); | |
c709acd1 | 8791 | |
4aa995e1 | 8792 | transferred = |
8b88a78e | 8793 | target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, |
4aa995e1 PA |
8794 | NULL, |
8795 | value_contents_all_raw (v), | |
8796 | value_offset (v), | |
8797 | TYPE_LENGTH (value_type (v))); | |
8798 | ||
8799 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8800 | error (_("Unable to read siginfo")); | |
8801 | } | |
8802 | ||
8803 | /* This function implements the lval_computed support for writing a | |
8804 | $_siginfo value. */ | |
8805 | ||
8806 | static void | |
8807 | siginfo_value_write (struct value *v, struct value *fromval) | |
8808 | { | |
8809 | LONGEST transferred; | |
8810 | ||
a911d87a PA |
8811 | /* If we can access registers, so can we access $_siginfo. Likewise |
8812 | vice versa. */ | |
8813 | validate_registers_access (); | |
c709acd1 | 8814 | |
8b88a78e | 8815 | transferred = target_write (current_top_target (), |
4aa995e1 PA |
8816 | TARGET_OBJECT_SIGNAL_INFO, |
8817 | NULL, | |
8818 | value_contents_all_raw (fromval), | |
8819 | value_offset (v), | |
8820 | TYPE_LENGTH (value_type (fromval))); | |
8821 | ||
8822 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8823 | error (_("Unable to write siginfo")); | |
8824 | } | |
8825 | ||
c8f2448a | 8826 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8827 | { |
8828 | siginfo_value_read, | |
8829 | siginfo_value_write | |
8830 | }; | |
8831 | ||
8832 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8833 | the current thread using architecture GDBARCH. Return a void value |
8834 | if there's no object available. */ | |
4aa995e1 | 8835 | |
2c0b251b | 8836 | static struct value * |
22d2b532 SDJ |
8837 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8838 | void *ignore) | |
4aa995e1 | 8839 | { |
4aa995e1 | 8840 | if (target_has_stack |
d7e15655 | 8841 | && inferior_ptid != null_ptid |
78267919 | 8842 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 8843 | { |
78267919 | 8844 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8845 | |
78267919 | 8846 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8847 | } |
8848 | ||
78267919 | 8849 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8850 | } |
8851 | ||
c906108c | 8852 | \f |
16c381f0 JK |
8853 | /* infcall_suspend_state contains state about the program itself like its |
8854 | registers and any signal it received when it last stopped. | |
8855 | This state must be restored regardless of how the inferior function call | |
8856 | ends (either successfully, or after it hits a breakpoint or signal) | |
8857 | if the program is to properly continue where it left off. */ | |
8858 | ||
6bf78e29 | 8859 | class infcall_suspend_state |
7a292a7a | 8860 | { |
6bf78e29 AB |
8861 | public: |
8862 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
8863 | once the inferior function call has finished. */ | |
8864 | infcall_suspend_state (struct gdbarch *gdbarch, | |
8865 | const struct thread_info *tp, | |
8866 | struct regcache *regcache) | |
8867 | : m_thread_suspend (tp->suspend), | |
8868 | m_registers (new readonly_detached_regcache (*regcache)) | |
8869 | { | |
8870 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
8871 | ||
8872 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8873 | { | |
8874 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8875 | size_t len = TYPE_LENGTH (type); | |
8876 | ||
8877 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); | |
8878 | ||
8879 | if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8880 | siginfo_data.get (), 0, len) != len) | |
8881 | { | |
8882 | /* Errors ignored. */ | |
8883 | siginfo_data.reset (nullptr); | |
8884 | } | |
8885 | } | |
8886 | ||
8887 | if (siginfo_data) | |
8888 | { | |
8889 | m_siginfo_gdbarch = gdbarch; | |
8890 | m_siginfo_data = std::move (siginfo_data); | |
8891 | } | |
8892 | } | |
8893 | ||
8894 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 8895 | |
6bf78e29 AB |
8896 | readonly_detached_regcache *registers () const |
8897 | { | |
8898 | return m_registers.get (); | |
8899 | } | |
8900 | ||
8901 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
8902 | ||
8903 | void restore (struct gdbarch *gdbarch, | |
8904 | struct thread_info *tp, | |
8905 | struct regcache *regcache) const | |
8906 | { | |
8907 | tp->suspend = m_thread_suspend; | |
8908 | ||
8909 | if (m_siginfo_gdbarch == gdbarch) | |
8910 | { | |
8911 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8912 | ||
8913 | /* Errors ignored. */ | |
8914 | target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8915 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); | |
8916 | } | |
8917 | ||
8918 | /* The inferior can be gone if the user types "print exit(0)" | |
8919 | (and perhaps other times). */ | |
8920 | if (target_has_execution) | |
8921 | /* NB: The register write goes through to the target. */ | |
8922 | regcache->restore (registers ()); | |
8923 | } | |
8924 | ||
8925 | private: | |
8926 | /* How the current thread stopped before the inferior function call was | |
8927 | executed. */ | |
8928 | struct thread_suspend_state m_thread_suspend; | |
8929 | ||
8930 | /* The registers before the inferior function call was executed. */ | |
8931 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 8932 | |
35515841 | 8933 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 8934 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
8935 | |
8936 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
8937 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
8938 | content would be invalid. */ | |
6bf78e29 | 8939 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
8940 | }; |
8941 | ||
cb524840 TT |
8942 | infcall_suspend_state_up |
8943 | save_infcall_suspend_state () | |
b89667eb | 8944 | { |
b89667eb | 8945 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 8946 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8947 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 8948 | |
6bf78e29 AB |
8949 | infcall_suspend_state_up inf_state |
8950 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 8951 | |
6bf78e29 AB |
8952 | /* Having saved the current state, adjust the thread state, discarding |
8953 | any stop signal information. The stop signal is not useful when | |
8954 | starting an inferior function call, and run_inferior_call will not use | |
8955 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 8956 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 8957 | |
b89667eb DE |
8958 | return inf_state; |
8959 | } | |
8960 | ||
8961 | /* Restore inferior session state to INF_STATE. */ | |
8962 | ||
8963 | void | |
16c381f0 | 8964 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
8965 | { |
8966 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 8967 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 8968 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 8969 | |
6bf78e29 | 8970 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 8971 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
8972 | } |
8973 | ||
b89667eb | 8974 | void |
16c381f0 | 8975 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 8976 | { |
dd848631 | 8977 | delete inf_state; |
b89667eb DE |
8978 | } |
8979 | ||
daf6667d | 8980 | readonly_detached_regcache * |
16c381f0 | 8981 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 8982 | { |
6bf78e29 | 8983 | return inf_state->registers (); |
b89667eb DE |
8984 | } |
8985 | ||
16c381f0 JK |
8986 | /* infcall_control_state contains state regarding gdb's control of the |
8987 | inferior itself like stepping control. It also contains session state like | |
8988 | the user's currently selected frame. */ | |
b89667eb | 8989 | |
16c381f0 | 8990 | struct infcall_control_state |
b89667eb | 8991 | { |
16c381f0 JK |
8992 | struct thread_control_state thread_control; |
8993 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
8994 | |
8995 | /* Other fields: */ | |
ee841dd8 TT |
8996 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
8997 | int stopped_by_random_signal = 0; | |
7a292a7a | 8998 | |
b89667eb | 8999 | /* ID if the selected frame when the inferior function call was made. */ |
ee841dd8 | 9000 | struct frame_id selected_frame_id {}; |
7a292a7a SS |
9001 | }; |
9002 | ||
c906108c | 9003 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9004 | connection. */ |
c906108c | 9005 | |
cb524840 TT |
9006 | infcall_control_state_up |
9007 | save_infcall_control_state () | |
c906108c | 9008 | { |
cb524840 | 9009 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9010 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9011 | struct inferior *inf = current_inferior (); |
7a292a7a | 9012 | |
16c381f0 JK |
9013 | inf_status->thread_control = tp->control; |
9014 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9015 | |
8358c15c | 9016 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9017 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9018 | |
16c381f0 JK |
9019 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9020 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9021 | hand them back the original chain when restore_infcall_control_state is | |
9022 | called. */ | |
9023 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9024 | |
9025 | /* Other fields: */ | |
9026 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9027 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9028 | |
206415a3 | 9029 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 9030 | |
7a292a7a | 9031 | return inf_status; |
c906108c SS |
9032 | } |
9033 | ||
bf469271 PA |
9034 | static void |
9035 | restore_selected_frame (const frame_id &fid) | |
c906108c | 9036 | { |
bf469271 | 9037 | frame_info *frame = frame_find_by_id (fid); |
c906108c | 9038 | |
aa0cd9c1 AC |
9039 | /* If inf_status->selected_frame_id is NULL, there was no previously |
9040 | selected frame. */ | |
101dcfbe | 9041 | if (frame == NULL) |
c906108c | 9042 | { |
8a3fe4f8 | 9043 | warning (_("Unable to restore previously selected frame.")); |
bf469271 | 9044 | return; |
c906108c SS |
9045 | } |
9046 | ||
0f7d239c | 9047 | select_frame (frame); |
c906108c SS |
9048 | } |
9049 | ||
b89667eb DE |
9050 | /* Restore inferior session state to INF_STATUS. */ |
9051 | ||
c906108c | 9052 | void |
16c381f0 | 9053 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9054 | { |
4e1c45ea | 9055 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9056 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9057 | |
8358c15c JK |
9058 | if (tp->control.step_resume_breakpoint) |
9059 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9060 | ||
5b79abe7 TT |
9061 | if (tp->control.exception_resume_breakpoint) |
9062 | tp->control.exception_resume_breakpoint->disposition | |
9063 | = disp_del_at_next_stop; | |
9064 | ||
d82142e2 | 9065 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9066 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9067 | |
16c381f0 JK |
9068 | tp->control = inf_status->thread_control; |
9069 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9070 | |
9071 | /* Other fields: */ | |
9072 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9073 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9074 | |
b89667eb | 9075 | if (target_has_stack) |
c906108c | 9076 | { |
bf469271 | 9077 | /* The point of the try/catch is that if the stack is clobbered, |
101dcfbe AC |
9078 | walking the stack might encounter a garbage pointer and |
9079 | error() trying to dereference it. */ | |
a70b8144 | 9080 | try |
bf469271 PA |
9081 | { |
9082 | restore_selected_frame (inf_status->selected_frame_id); | |
9083 | } | |
230d2906 | 9084 | catch (const gdb_exception_error &ex) |
bf469271 PA |
9085 | { |
9086 | exception_fprintf (gdb_stderr, ex, | |
9087 | "Unable to restore previously selected frame:\n"); | |
9088 | /* Error in restoring the selected frame. Select the | |
9089 | innermost frame. */ | |
9090 | select_frame (get_current_frame ()); | |
9091 | } | |
c906108c | 9092 | } |
c906108c | 9093 | |
ee841dd8 | 9094 | delete inf_status; |
7a292a7a | 9095 | } |
c906108c SS |
9096 | |
9097 | void | |
16c381f0 | 9098 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9099 | { |
8358c15c JK |
9100 | if (inf_status->thread_control.step_resume_breakpoint) |
9101 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9102 | = disp_del_at_next_stop; | |
9103 | ||
5b79abe7 TT |
9104 | if (inf_status->thread_control.exception_resume_breakpoint) |
9105 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9106 | = disp_del_at_next_stop; | |
9107 | ||
1777feb0 | 9108 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9109 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9110 | |
ee841dd8 | 9111 | delete inf_status; |
7a292a7a | 9112 | } |
b89667eb | 9113 | \f |
7f89fd65 | 9114 | /* See infrun.h. */ |
0c557179 SDJ |
9115 | |
9116 | void | |
9117 | clear_exit_convenience_vars (void) | |
9118 | { | |
9119 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9120 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9121 | } | |
c5aa993b | 9122 | \f |
488f131b | 9123 | |
b2175913 MS |
9124 | /* User interface for reverse debugging: |
9125 | Set exec-direction / show exec-direction commands | |
9126 | (returns error unless target implements to_set_exec_direction method). */ | |
9127 | ||
170742de | 9128 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9129 | static const char exec_forward[] = "forward"; |
9130 | static const char exec_reverse[] = "reverse"; | |
9131 | static const char *exec_direction = exec_forward; | |
40478521 | 9132 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9133 | exec_forward, |
9134 | exec_reverse, | |
9135 | NULL | |
9136 | }; | |
9137 | ||
9138 | static void | |
eb4c3f4a | 9139 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9140 | struct cmd_list_element *cmd) |
9141 | { | |
9142 | if (target_can_execute_reverse) | |
9143 | { | |
9144 | if (!strcmp (exec_direction, exec_forward)) | |
9145 | execution_direction = EXEC_FORWARD; | |
9146 | else if (!strcmp (exec_direction, exec_reverse)) | |
9147 | execution_direction = EXEC_REVERSE; | |
9148 | } | |
8bbed405 MS |
9149 | else |
9150 | { | |
9151 | exec_direction = exec_forward; | |
9152 | error (_("Target does not support this operation.")); | |
9153 | } | |
b2175913 MS |
9154 | } |
9155 | ||
9156 | static void | |
9157 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9158 | struct cmd_list_element *cmd, const char *value) | |
9159 | { | |
9160 | switch (execution_direction) { | |
9161 | case EXEC_FORWARD: | |
9162 | fprintf_filtered (out, _("Forward.\n")); | |
9163 | break; | |
9164 | case EXEC_REVERSE: | |
9165 | fprintf_filtered (out, _("Reverse.\n")); | |
9166 | break; | |
b2175913 | 9167 | default: |
d8b34453 PA |
9168 | internal_error (__FILE__, __LINE__, |
9169 | _("bogus execution_direction value: %d"), | |
9170 | (int) execution_direction); | |
b2175913 MS |
9171 | } |
9172 | } | |
9173 | ||
d4db2f36 PA |
9174 | static void |
9175 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9176 | struct cmd_list_element *c, const char *value) | |
9177 | { | |
3e43a32a MS |
9178 | fprintf_filtered (file, _("Resuming the execution of threads " |
9179 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9180 | } |
ad52ddc6 | 9181 | |
22d2b532 SDJ |
9182 | /* Implementation of `siginfo' variable. */ |
9183 | ||
9184 | static const struct internalvar_funcs siginfo_funcs = | |
9185 | { | |
9186 | siginfo_make_value, | |
9187 | NULL, | |
9188 | NULL | |
9189 | }; | |
9190 | ||
372316f1 PA |
9191 | /* Callback for infrun's target events source. This is marked when a |
9192 | thread has a pending status to process. */ | |
9193 | ||
9194 | static void | |
9195 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9196 | { | |
372316f1 PA |
9197 | inferior_event_handler (INF_REG_EVENT, NULL); |
9198 | } | |
9199 | ||
6c265988 | 9200 | void _initialize_infrun (); |
c906108c | 9201 | void |
6c265988 | 9202 | _initialize_infrun () |
c906108c | 9203 | { |
de0bea00 | 9204 | struct cmd_list_element *c; |
c906108c | 9205 | |
372316f1 PA |
9206 | /* Register extra event sources in the event loop. */ |
9207 | infrun_async_inferior_event_token | |
9208 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
9209 | ||
11db9430 | 9210 | add_info ("signals", info_signals_command, _("\ |
1bedd215 AC |
9211 | What debugger does when program gets various signals.\n\ |
9212 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9213 | add_info_alias ("handle", "signals", 0); |
9214 | ||
de0bea00 | 9215 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9216 | Specify how to handle signals.\n\ |
486c7739 | 9217 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9218 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9219 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9220 | will be displayed instead.\n\ |
9221 | \n\ | |
c906108c SS |
9222 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9223 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9224 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9225 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9226 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9227 | \n\ |
1bedd215 | 9228 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9229 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9230 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9231 | Print means print a message if this signal happens.\n\ | |
9232 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9233 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9234 | Pass and Stop may be combined.\n\ |
9235 | \n\ | |
9236 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9237 | may be interspersed with actions, with the actions being performed for\n\ | |
9238 | all signals cumulatively specified.")); | |
de0bea00 | 9239 | set_cmd_completer (c, handle_completer); |
486c7739 | 9240 | |
c906108c | 9241 | if (!dbx_commands) |
1a966eab AC |
9242 | stop_command = add_cmd ("stop", class_obscure, |
9243 | not_just_help_class_command, _("\ | |
9244 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9245 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9246 | of the program stops."), &cmdlist); |
c906108c | 9247 | |
ccce17b0 | 9248 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9249 | Set inferior debugging."), _("\ |
9250 | Show inferior debugging."), _("\ | |
9251 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9252 | NULL, |
9253 | show_debug_infrun, | |
9254 | &setdebuglist, &showdebuglist); | |
527159b7 | 9255 | |
3e43a32a MS |
9256 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9257 | &debug_displaced, _("\ | |
237fc4c9 PA |
9258 | Set displaced stepping debugging."), _("\ |
9259 | Show displaced stepping debugging."), _("\ | |
9260 | When non-zero, displaced stepping specific debugging is enabled."), | |
9261 | NULL, | |
9262 | show_debug_displaced, | |
9263 | &setdebuglist, &showdebuglist); | |
9264 | ||
ad52ddc6 PA |
9265 | add_setshow_boolean_cmd ("non-stop", no_class, |
9266 | &non_stop_1, _("\ | |
9267 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9268 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9269 | When debugging a multi-threaded program and this setting is\n\ | |
9270 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9271 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9272 | all other threads in the program while you interact with the thread of\n\ | |
9273 | interest. When you continue or step a thread, you can allow the other\n\ | |
9274 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9275 | thread's state, all threads stop.\n\ | |
9276 | \n\ | |
9277 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9278 | to run freely. You'll be able to step each thread independently,\n\ | |
9279 | leave it stopped or free to run as needed."), | |
9280 | set_non_stop, | |
9281 | show_non_stop, | |
9282 | &setlist, | |
9283 | &showlist); | |
9284 | ||
adc6a863 | 9285 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9286 | { |
9287 | signal_stop[i] = 1; | |
9288 | signal_print[i] = 1; | |
9289 | signal_program[i] = 1; | |
ab04a2af | 9290 | signal_catch[i] = 0; |
c906108c SS |
9291 | } |
9292 | ||
4d9d9d04 PA |
9293 | /* Signals caused by debugger's own actions should not be given to |
9294 | the program afterwards. | |
9295 | ||
9296 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9297 | explicitly specifies that it should be delivered to the target | |
9298 | program. Typically, that would occur when a user is debugging a | |
9299 | target monitor on a simulator: the target monitor sets a | |
9300 | breakpoint; the simulator encounters this breakpoint and halts | |
9301 | the simulation handing control to GDB; GDB, noting that the stop | |
9302 | address doesn't map to any known breakpoint, returns control back | |
9303 | to the simulator; the simulator then delivers the hardware | |
9304 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9305 | debugged. */ | |
a493e3e2 PA |
9306 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9307 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9308 | |
9309 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9310 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9311 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9312 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9313 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9314 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9315 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9316 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9317 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9318 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9319 | signal_print[GDB_SIGNAL_IO] = 0; | |
9320 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9321 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9322 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9323 | signal_print[GDB_SIGNAL_URG] = 0; | |
9324 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9325 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9326 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9327 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9328 | |
cd0fc7c3 SS |
9329 | /* These signals are used internally by user-level thread |
9330 | implementations. (See signal(5) on Solaris.) Like the above | |
9331 | signals, a healthy program receives and handles them as part of | |
9332 | its normal operation. */ | |
a493e3e2 PA |
9333 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9334 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9335 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9336 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9337 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9338 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9339 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9340 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9341 | |
2455069d UW |
9342 | /* Update cached state. */ |
9343 | signal_cache_update (-1); | |
9344 | ||
85c07804 AC |
9345 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9346 | &stop_on_solib_events, _("\ | |
9347 | Set stopping for shared library events."), _("\ | |
9348 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9349 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9350 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9351 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9352 | set_stop_on_solib_events, |
920d2a44 | 9353 | show_stop_on_solib_events, |
85c07804 | 9354 | &setlist, &showlist); |
c906108c | 9355 | |
7ab04401 AC |
9356 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9357 | follow_fork_mode_kind_names, | |
9358 | &follow_fork_mode_string, _("\ | |
9359 | Set debugger response to a program call of fork or vfork."), _("\ | |
9360 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9361 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9362 | parent - the original process is debugged after a fork\n\ | |
9363 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9364 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9365 | By default, the debugger will follow the parent process."), |
9366 | NULL, | |
920d2a44 | 9367 | show_follow_fork_mode_string, |
7ab04401 AC |
9368 | &setlist, &showlist); |
9369 | ||
6c95b8df PA |
9370 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9371 | follow_exec_mode_names, | |
9372 | &follow_exec_mode_string, _("\ | |
9373 | Set debugger response to a program call of exec."), _("\ | |
9374 | Show debugger response to a program call of exec."), _("\ | |
9375 | An exec call replaces the program image of a process.\n\ | |
9376 | \n\ | |
9377 | follow-exec-mode can be:\n\ | |
9378 | \n\ | |
cce7e648 | 9379 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9380 | to this new inferior. The program the process was running before\n\ |
9381 | the exec call can be restarted afterwards by restarting the original\n\ | |
9382 | inferior.\n\ | |
9383 | \n\ | |
9384 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9385 | The new executable image replaces the previous executable loaded in\n\ | |
9386 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9387 | the executable the process was running after the exec call.\n\ | |
9388 | \n\ | |
9389 | By default, the debugger will use the same inferior."), | |
9390 | NULL, | |
9391 | show_follow_exec_mode_string, | |
9392 | &setlist, &showlist); | |
9393 | ||
7ab04401 AC |
9394 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9395 | scheduler_enums, &scheduler_mode, _("\ | |
9396 | Set mode for locking scheduler during execution."), _("\ | |
9397 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9398 | off == no locking (threads may preempt at any time)\n\ |
9399 | on == full locking (no thread except the current thread may run)\n\ | |
9400 | This applies to both normal execution and replay mode.\n\ | |
9401 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9402 | In this mode, other threads may run during other commands.\n\ | |
9403 | This applies to both normal execution and replay mode.\n\ | |
9404 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9405 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9406 | show_scheduler_mode, |
7ab04401 | 9407 | &setlist, &showlist); |
5fbbeb29 | 9408 | |
d4db2f36 PA |
9409 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9410 | Set mode for resuming threads of all processes."), _("\ | |
9411 | Show mode for resuming threads of all processes."), _("\ | |
9412 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9413 | threads of all processes. When off (which is the default), execution\n\ | |
9414 | commands only resume the threads of the current process. The set of\n\ | |
9415 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9416 | mode (see help set scheduler-locking)."), | |
9417 | NULL, | |
9418 | show_schedule_multiple, | |
9419 | &setlist, &showlist); | |
9420 | ||
5bf193a2 AC |
9421 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9422 | Set mode of the step operation."), _("\ | |
9423 | Show mode of the step operation."), _("\ | |
9424 | When set, doing a step over a function without debug line information\n\ | |
9425 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9426 | function is skipped and the step command stops at a different source line."), | |
9427 | NULL, | |
920d2a44 | 9428 | show_step_stop_if_no_debug, |
5bf193a2 | 9429 | &setlist, &showlist); |
ca6724c1 | 9430 | |
72d0e2c5 YQ |
9431 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9432 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9433 | Set debugger's willingness to use displaced stepping."), _("\ |
9434 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9435 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9436 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9437 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9438 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9439 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9440 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9441 | NULL, |
9442 | show_can_use_displaced_stepping, | |
9443 | &setlist, &showlist); | |
237fc4c9 | 9444 | |
b2175913 MS |
9445 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9446 | &exec_direction, _("Set direction of execution.\n\ | |
9447 | Options are 'forward' or 'reverse'."), | |
9448 | _("Show direction of execution (forward/reverse)."), | |
9449 | _("Tells gdb whether to execute forward or backward."), | |
9450 | set_exec_direction_func, show_exec_direction_func, | |
9451 | &setlist, &showlist); | |
9452 | ||
6c95b8df PA |
9453 | /* Set/show detach-on-fork: user-settable mode. */ |
9454 | ||
9455 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9456 | Set whether gdb will detach the child of a fork."), _("\ | |
9457 | Show whether gdb will detach the child of a fork."), _("\ | |
9458 | Tells gdb whether to detach the child of a fork."), | |
9459 | NULL, NULL, &setlist, &showlist); | |
9460 | ||
03583c20 UW |
9461 | /* Set/show disable address space randomization mode. */ |
9462 | ||
9463 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9464 | &disable_randomization, _("\ | |
9465 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9466 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9467 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9468 | address space is disabled. Standalone programs run with the randomization\n\ | |
9469 | enabled by default on some platforms."), | |
9470 | &set_disable_randomization, | |
9471 | &show_disable_randomization, | |
9472 | &setlist, &showlist); | |
9473 | ||
ca6724c1 | 9474 | /* ptid initializations */ |
ca6724c1 KB |
9475 | inferior_ptid = null_ptid; |
9476 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9477 | |
76727919 TT |
9478 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed); |
9479 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested); | |
9480 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit); | |
9481 | gdb::observers::inferior_exit.attach (infrun_inferior_exit); | |
4aa995e1 PA |
9482 | |
9483 | /* Explicitly create without lookup, since that tries to create a | |
9484 | value with a void typed value, and when we get here, gdbarch | |
9485 | isn't initialized yet. At this point, we're quite sure there | |
9486 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9487 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9488 | |
9489 | add_setshow_boolean_cmd ("observer", no_class, | |
9490 | &observer_mode_1, _("\ | |
9491 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9492 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9493 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9494 | affect its execution. Registers and memory may not be changed,\n\ | |
9495 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9496 | or signalled."), | |
9497 | set_observer_mode, | |
9498 | show_observer_mode, | |
9499 | &setlist, | |
9500 | &showlist); | |
c906108c | 9501 | } |