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" | |
45741a9c | 22 | #include "infrun.h" |
c906108c SS |
23 | #include <ctype.h> |
24 | #include "symtab.h" | |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "breakpoint.h" | |
c906108c SS |
28 | #include "gdbcore.h" |
29 | #include "gdbcmd.h" | |
30 | #include "target.h" | |
31 | #include "gdbthread.h" | |
32 | #include "annotate.h" | |
1adeb98a | 33 | #include "symfile.h" |
7a292a7a | 34 | #include "top.h" |
2acceee2 | 35 | #include "inf-loop.h" |
4e052eda | 36 | #include "regcache.h" |
fd0407d6 | 37 | #include "value.h" |
76727919 | 38 | #include "observable.h" |
f636b87d | 39 | #include "language.h" |
a77053c2 | 40 | #include "solib.h" |
f17517ea | 41 | #include "main.h" |
186c406b | 42 | #include "block.h" |
034dad6f | 43 | #include "mi/mi-common.h" |
4f8d22e3 | 44 | #include "event-top.h" |
96429cc8 | 45 | #include "record.h" |
d02ed0bb | 46 | #include "record-full.h" |
edb3359d | 47 | #include "inline-frame.h" |
4efc6507 | 48 | #include "jit.h" |
06cd862c | 49 | #include "tracepoint.h" |
1bfeeb0f | 50 | #include "skip.h" |
28106bc2 SDJ |
51 | #include "probe.h" |
52 | #include "objfiles.h" | |
de0bea00 | 53 | #include "completer.h" |
9107fc8d | 54 | #include "target-descriptions.h" |
f15cb84a | 55 | #include "target-dcache.h" |
d83ad864 | 56 | #include "terminal.h" |
ff862be4 | 57 | #include "solist.h" |
372316f1 | 58 | #include "event-loop.h" |
243a9253 | 59 | #include "thread-fsm.h" |
268a13a5 | 60 | #include "gdbsupport/enum-flags.h" |
5ed8105e | 61 | #include "progspace-and-thread.h" |
268a13a5 | 62 | #include "gdbsupport/gdb_optional.h" |
46a62268 | 63 | #include "arch-utils.h" |
268a13a5 TT |
64 | #include "gdbsupport/scope-exit.h" |
65 | #include "gdbsupport/forward-scope-exit.h" | |
5b6d1e4f PA |
66 | #include "gdb_select.h" |
67 | #include <unordered_map> | |
c906108c SS |
68 | |
69 | /* Prototypes for local functions */ | |
70 | ||
2ea28649 | 71 | static void sig_print_info (enum gdb_signal); |
c906108c | 72 | |
96baa820 | 73 | static void sig_print_header (void); |
c906108c | 74 | |
4ef3f3be | 75 | static int follow_fork (void); |
96baa820 | 76 | |
d83ad864 DB |
77 | static int follow_fork_inferior (int follow_child, int detach_fork); |
78 | ||
79 | static void follow_inferior_reset_breakpoints (void); | |
80 | ||
a289b8f6 JK |
81 | static int currently_stepping (struct thread_info *tp); |
82 | ||
2c03e5be | 83 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
84 | |
85 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
86 | ||
2484c66b UW |
87 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
88 | ||
8550d3b3 YQ |
89 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
90 | ||
aff4e175 AB |
91 | static void resume (gdb_signal sig); |
92 | ||
5b6d1e4f PA |
93 | static void wait_for_inferior (inferior *inf); |
94 | ||
372316f1 PA |
95 | /* Asynchronous signal handler registered as event loop source for |
96 | when we have pending events ready to be passed to the core. */ | |
97 | static struct async_event_handler *infrun_async_inferior_event_token; | |
98 | ||
99 | /* Stores whether infrun_async was previously enabled or disabled. | |
100 | Starts off as -1, indicating "never enabled/disabled". */ | |
101 | static int infrun_is_async = -1; | |
102 | ||
103 | /* See infrun.h. */ | |
104 | ||
105 | void | |
106 | infrun_async (int enable) | |
107 | { | |
108 | if (infrun_is_async != enable) | |
109 | { | |
110 | infrun_is_async = enable; | |
111 | ||
112 | if (debug_infrun) | |
113 | fprintf_unfiltered (gdb_stdlog, | |
114 | "infrun: infrun_async(%d)\n", | |
115 | enable); | |
116 | ||
117 | if (enable) | |
118 | mark_async_event_handler (infrun_async_inferior_event_token); | |
119 | else | |
120 | clear_async_event_handler (infrun_async_inferior_event_token); | |
121 | } | |
122 | } | |
123 | ||
0b333c5e PA |
124 | /* See infrun.h. */ |
125 | ||
126 | void | |
127 | mark_infrun_async_event_handler (void) | |
128 | { | |
129 | mark_async_event_handler (infrun_async_inferior_event_token); | |
130 | } | |
131 | ||
5fbbeb29 CF |
132 | /* When set, stop the 'step' command if we enter a function which has |
133 | no line number information. The normal behavior is that we step | |
134 | over such function. */ | |
491144b5 | 135 | bool step_stop_if_no_debug = false; |
920d2a44 AC |
136 | static void |
137 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
138 | struct cmd_list_element *c, const char *value) | |
139 | { | |
140 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
141 | } | |
5fbbeb29 | 142 | |
b9f437de PA |
143 | /* proceed and normal_stop use this to notify the user when the |
144 | inferior stopped in a different thread than it had been running | |
145 | in. */ | |
96baa820 | 146 | |
39f77062 | 147 | static ptid_t previous_inferior_ptid; |
7a292a7a | 148 | |
07107ca6 LM |
149 | /* If set (default for legacy reasons), when following a fork, GDB |
150 | will detach from one of the fork branches, child or parent. | |
151 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
152 | setting. */ | |
153 | ||
491144b5 | 154 | static bool detach_fork = true; |
6c95b8df | 155 | |
491144b5 | 156 | bool debug_displaced = false; |
237fc4c9 PA |
157 | static void |
158 | show_debug_displaced (struct ui_file *file, int from_tty, | |
159 | struct cmd_list_element *c, const char *value) | |
160 | { | |
161 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
162 | } | |
163 | ||
ccce17b0 | 164 | unsigned int debug_infrun = 0; |
920d2a44 AC |
165 | static void |
166 | show_debug_infrun (struct ui_file *file, int from_tty, | |
167 | struct cmd_list_element *c, const char *value) | |
168 | { | |
169 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
170 | } | |
527159b7 | 171 | |
03583c20 UW |
172 | |
173 | /* Support for disabling address space randomization. */ | |
174 | ||
491144b5 | 175 | bool disable_randomization = true; |
03583c20 UW |
176 | |
177 | static void | |
178 | show_disable_randomization (struct ui_file *file, int from_tty, | |
179 | struct cmd_list_element *c, const char *value) | |
180 | { | |
181 | if (target_supports_disable_randomization ()) | |
182 | fprintf_filtered (file, | |
183 | _("Disabling randomization of debuggee's " | |
184 | "virtual address space is %s.\n"), | |
185 | value); | |
186 | else | |
187 | fputs_filtered (_("Disabling randomization of debuggee's " | |
188 | "virtual address space is unsupported on\n" | |
189 | "this platform.\n"), file); | |
190 | } | |
191 | ||
192 | static void | |
eb4c3f4a | 193 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
194 | struct cmd_list_element *c) |
195 | { | |
196 | if (!target_supports_disable_randomization ()) | |
197 | error (_("Disabling randomization of debuggee's " | |
198 | "virtual address space is unsupported on\n" | |
199 | "this platform.")); | |
200 | } | |
201 | ||
d32dc48e PA |
202 | /* User interface for non-stop mode. */ |
203 | ||
491144b5 CB |
204 | bool non_stop = false; |
205 | static bool non_stop_1 = false; | |
d32dc48e PA |
206 | |
207 | static void | |
eb4c3f4a | 208 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
209 | struct cmd_list_element *c) |
210 | { | |
211 | if (target_has_execution) | |
212 | { | |
213 | non_stop_1 = non_stop; | |
214 | error (_("Cannot change this setting while the inferior is running.")); | |
215 | } | |
216 | ||
217 | non_stop = non_stop_1; | |
218 | } | |
219 | ||
220 | static void | |
221 | show_non_stop (struct ui_file *file, int from_tty, | |
222 | struct cmd_list_element *c, const char *value) | |
223 | { | |
224 | fprintf_filtered (file, | |
225 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
226 | value); | |
227 | } | |
228 | ||
d914c394 SS |
229 | /* "Observer mode" is somewhat like a more extreme version of |
230 | non-stop, in which all GDB operations that might affect the | |
231 | target's execution have been disabled. */ | |
232 | ||
491144b5 CB |
233 | bool observer_mode = false; |
234 | static bool observer_mode_1 = false; | |
d914c394 SS |
235 | |
236 | static void | |
eb4c3f4a | 237 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
238 | struct cmd_list_element *c) |
239 | { | |
d914c394 SS |
240 | if (target_has_execution) |
241 | { | |
242 | observer_mode_1 = observer_mode; | |
243 | error (_("Cannot change this setting while the inferior is running.")); | |
244 | } | |
245 | ||
246 | observer_mode = observer_mode_1; | |
247 | ||
248 | may_write_registers = !observer_mode; | |
249 | may_write_memory = !observer_mode; | |
250 | may_insert_breakpoints = !observer_mode; | |
251 | may_insert_tracepoints = !observer_mode; | |
252 | /* We can insert fast tracepoints in or out of observer mode, | |
253 | but enable them if we're going into this mode. */ | |
254 | if (observer_mode) | |
491144b5 | 255 | may_insert_fast_tracepoints = true; |
d914c394 SS |
256 | may_stop = !observer_mode; |
257 | update_target_permissions (); | |
258 | ||
259 | /* Going *into* observer mode we must force non-stop, then | |
260 | going out we leave it that way. */ | |
261 | if (observer_mode) | |
262 | { | |
d914c394 | 263 | pagination_enabled = 0; |
491144b5 | 264 | non_stop = non_stop_1 = true; |
d914c394 SS |
265 | } |
266 | ||
267 | if (from_tty) | |
268 | printf_filtered (_("Observer mode is now %s.\n"), | |
269 | (observer_mode ? "on" : "off")); | |
270 | } | |
271 | ||
272 | static void | |
273 | show_observer_mode (struct ui_file *file, int from_tty, | |
274 | struct cmd_list_element *c, const char *value) | |
275 | { | |
276 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
277 | } | |
278 | ||
279 | /* This updates the value of observer mode based on changes in | |
280 | permissions. Note that we are deliberately ignoring the values of | |
281 | may-write-registers and may-write-memory, since the user may have | |
282 | reason to enable these during a session, for instance to turn on a | |
283 | debugging-related global. */ | |
284 | ||
285 | void | |
286 | update_observer_mode (void) | |
287 | { | |
491144b5 CB |
288 | bool newval = (!may_insert_breakpoints |
289 | && !may_insert_tracepoints | |
290 | && may_insert_fast_tracepoints | |
291 | && !may_stop | |
292 | && non_stop); | |
d914c394 SS |
293 | |
294 | /* Let the user know if things change. */ | |
295 | if (newval != observer_mode) | |
296 | printf_filtered (_("Observer mode is now %s.\n"), | |
297 | (newval ? "on" : "off")); | |
298 | ||
299 | observer_mode = observer_mode_1 = newval; | |
300 | } | |
c2c6d25f | 301 | |
c906108c SS |
302 | /* Tables of how to react to signals; the user sets them. */ |
303 | ||
adc6a863 PA |
304 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
305 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
306 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 307 | |
ab04a2af TT |
308 | /* Table of signals that are registered with "catch signal". A |
309 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
310 | signal" command. */ |
311 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 312 | |
2455069d UW |
313 | /* Table of signals that the target may silently handle. |
314 | This is automatically determined from the flags above, | |
315 | and simply cached here. */ | |
adc6a863 | 316 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 317 | |
c906108c SS |
318 | #define SET_SIGS(nsigs,sigs,flags) \ |
319 | do { \ | |
320 | int signum = (nsigs); \ | |
321 | while (signum-- > 0) \ | |
322 | if ((sigs)[signum]) \ | |
323 | (flags)[signum] = 1; \ | |
324 | } while (0) | |
325 | ||
326 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
327 | do { \ | |
328 | int signum = (nsigs); \ | |
329 | while (signum-- > 0) \ | |
330 | if ((sigs)[signum]) \ | |
331 | (flags)[signum] = 0; \ | |
332 | } while (0) | |
333 | ||
9b224c5e PA |
334 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
335 | this function is to avoid exporting `signal_program'. */ | |
336 | ||
337 | void | |
338 | update_signals_program_target (void) | |
339 | { | |
adc6a863 | 340 | target_program_signals (signal_program); |
9b224c5e PA |
341 | } |
342 | ||
1777feb0 | 343 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 344 | |
edb3359d | 345 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
346 | |
347 | /* Command list pointer for the "stop" placeholder. */ | |
348 | ||
349 | static struct cmd_list_element *stop_command; | |
350 | ||
c906108c SS |
351 | /* Nonzero if we want to give control to the user when we're notified |
352 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 353 | int stop_on_solib_events; |
f9e14852 GB |
354 | |
355 | /* Enable or disable optional shared library event breakpoints | |
356 | as appropriate when the above flag is changed. */ | |
357 | ||
358 | static void | |
eb4c3f4a TT |
359 | set_stop_on_solib_events (const char *args, |
360 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
361 | { |
362 | update_solib_breakpoints (); | |
363 | } | |
364 | ||
920d2a44 AC |
365 | static void |
366 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
367 | struct cmd_list_element *c, const char *value) | |
368 | { | |
369 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
370 | value); | |
371 | } | |
c906108c | 372 | |
c906108c SS |
373 | /* Nonzero after stop if current stack frame should be printed. */ |
374 | ||
375 | static int stop_print_frame; | |
376 | ||
5b6d1e4f PA |
377 | /* This is a cached copy of the target/ptid/waitstatus of the last |
378 | event returned by target_wait()/deprecated_target_wait_hook(). | |
379 | This information is returned by get_last_target_status(). */ | |
380 | static process_stratum_target *target_last_proc_target; | |
39f77062 | 381 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
382 | static struct target_waitstatus target_last_waitstatus; |
383 | ||
4e1c45ea | 384 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 385 | |
53904c9e AC |
386 | static const char follow_fork_mode_child[] = "child"; |
387 | static const char follow_fork_mode_parent[] = "parent"; | |
388 | ||
40478521 | 389 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
390 | follow_fork_mode_child, |
391 | follow_fork_mode_parent, | |
392 | NULL | |
ef346e04 | 393 | }; |
c906108c | 394 | |
53904c9e | 395 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
396 | static void |
397 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
398 | struct cmd_list_element *c, const char *value) | |
399 | { | |
3e43a32a MS |
400 | fprintf_filtered (file, |
401 | _("Debugger response to a program " | |
402 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
403 | value); |
404 | } | |
c906108c SS |
405 | \f |
406 | ||
d83ad864 DB |
407 | /* Handle changes to the inferior list based on the type of fork, |
408 | which process is being followed, and whether the other process | |
409 | should be detached. On entry inferior_ptid must be the ptid of | |
410 | the fork parent. At return inferior_ptid is the ptid of the | |
411 | followed inferior. */ | |
412 | ||
413 | static int | |
414 | follow_fork_inferior (int follow_child, int detach_fork) | |
415 | { | |
416 | int has_vforked; | |
79639e11 | 417 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
418 | |
419 | has_vforked = (inferior_thread ()->pending_follow.kind | |
420 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
421 | parent_ptid = inferior_ptid; |
422 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
423 | |
424 | if (has_vforked | |
425 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 426 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
427 | && !(follow_child || detach_fork || sched_multi)) |
428 | { | |
429 | /* The parent stays blocked inside the vfork syscall until the | |
430 | child execs or exits. If we don't let the child run, then | |
431 | the parent stays blocked. If we're telling the parent to run | |
432 | in the foreground, the user will not be able to ctrl-c to get | |
433 | back the terminal, effectively hanging the debug session. */ | |
434 | fprintf_filtered (gdb_stderr, _("\ | |
435 | Can not resume the parent process over vfork in the foreground while\n\ | |
436 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
437 | \"set schedule-multiple\".\n")); | |
d83ad864 DB |
438 | return 1; |
439 | } | |
440 | ||
441 | if (!follow_child) | |
442 | { | |
443 | /* Detach new forked process? */ | |
444 | if (detach_fork) | |
445 | { | |
d83ad864 DB |
446 | /* Before detaching from the child, remove all breakpoints |
447 | from it. If we forked, then this has already been taken | |
448 | care of by infrun.c. If we vforked however, any | |
449 | breakpoint inserted in the parent is visible in the | |
450 | child, even those added while stopped in a vfork | |
451 | catchpoint. This will remove the breakpoints from the | |
452 | parent also, but they'll be reinserted below. */ | |
453 | if (has_vforked) | |
454 | { | |
455 | /* Keep breakpoints list in sync. */ | |
00431a78 | 456 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
457 | } |
458 | ||
f67c0c91 | 459 | if (print_inferior_events) |
d83ad864 | 460 | { |
8dd06f7a | 461 | /* Ensure that we have a process ptid. */ |
e99b03dc | 462 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 463 | |
223ffa71 | 464 | target_terminal::ours_for_output (); |
d83ad864 | 465 | fprintf_filtered (gdb_stdlog, |
f67c0c91 | 466 | _("[Detaching after %s from child %s]\n"), |
6f259a23 | 467 | has_vforked ? "vfork" : "fork", |
a068643d | 468 | target_pid_to_str (process_ptid).c_str ()); |
d83ad864 DB |
469 | } |
470 | } | |
471 | else | |
472 | { | |
473 | struct inferior *parent_inf, *child_inf; | |
d83ad864 DB |
474 | |
475 | /* Add process to GDB's tables. */ | |
e99b03dc | 476 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
477 | |
478 | parent_inf = current_inferior (); | |
479 | child_inf->attach_flag = parent_inf->attach_flag; | |
480 | copy_terminal_info (child_inf, parent_inf); | |
481 | child_inf->gdbarch = parent_inf->gdbarch; | |
482 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
483 | ||
5ed8105e | 484 | scoped_restore_current_pspace_and_thread restore_pspace_thread; |
d83ad864 | 485 | |
2a00d7ce | 486 | set_current_inferior (child_inf); |
5b6d1e4f | 487 | switch_to_no_thread (); |
d83ad864 | 488 | child_inf->symfile_flags = SYMFILE_NO_READ; |
5b6d1e4f PA |
489 | push_target (parent_inf->process_target ()); |
490 | add_thread_silent (child_inf->process_target (), child_ptid); | |
491 | inferior_ptid = child_ptid; | |
d83ad864 DB |
492 | |
493 | /* If this is a vfork child, then the address-space is | |
494 | shared with the parent. */ | |
495 | if (has_vforked) | |
496 | { | |
497 | child_inf->pspace = parent_inf->pspace; | |
498 | child_inf->aspace = parent_inf->aspace; | |
499 | ||
5b6d1e4f PA |
500 | exec_on_vfork (); |
501 | ||
d83ad864 DB |
502 | /* The parent will be frozen until the child is done |
503 | with the shared region. Keep track of the | |
504 | parent. */ | |
505 | child_inf->vfork_parent = parent_inf; | |
506 | child_inf->pending_detach = 0; | |
507 | parent_inf->vfork_child = child_inf; | |
508 | parent_inf->pending_detach = 0; | |
509 | } | |
510 | else | |
511 | { | |
512 | child_inf->aspace = new_address_space (); | |
564b1e3f | 513 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
514 | child_inf->removable = 1; |
515 | set_current_program_space (child_inf->pspace); | |
516 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
517 | ||
518 | /* Let the shared library layer (e.g., solib-svr4) learn | |
519 | about this new process, relocate the cloned exec, pull | |
520 | in shared libraries, and install the solib event | |
521 | breakpoint. If a "cloned-VM" event was propagated | |
522 | better throughout the core, this wouldn't be | |
523 | required. */ | |
524 | solib_create_inferior_hook (0); | |
525 | } | |
d83ad864 DB |
526 | } |
527 | ||
528 | if (has_vforked) | |
529 | { | |
530 | struct inferior *parent_inf; | |
531 | ||
532 | parent_inf = current_inferior (); | |
533 | ||
534 | /* If we detached from the child, then we have to be careful | |
535 | to not insert breakpoints in the parent until the child | |
536 | is done with the shared memory region. However, if we're | |
537 | staying attached to the child, then we can and should | |
538 | insert breakpoints, so that we can debug it. A | |
539 | subsequent child exec or exit is enough to know when does | |
540 | the child stops using the parent's address space. */ | |
541 | parent_inf->waiting_for_vfork_done = detach_fork; | |
542 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
543 | } | |
544 | } | |
545 | else | |
546 | { | |
547 | /* Follow the child. */ | |
548 | struct inferior *parent_inf, *child_inf; | |
549 | struct program_space *parent_pspace; | |
550 | ||
f67c0c91 | 551 | if (print_inferior_events) |
d83ad864 | 552 | { |
f67c0c91 SDJ |
553 | std::string parent_pid = target_pid_to_str (parent_ptid); |
554 | std::string child_pid = target_pid_to_str (child_ptid); | |
555 | ||
223ffa71 | 556 | target_terminal::ours_for_output (); |
6f259a23 | 557 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
558 | _("[Attaching after %s %s to child %s]\n"), |
559 | parent_pid.c_str (), | |
6f259a23 | 560 | has_vforked ? "vfork" : "fork", |
f67c0c91 | 561 | child_pid.c_str ()); |
d83ad864 DB |
562 | } |
563 | ||
564 | /* Add the new inferior first, so that the target_detach below | |
565 | doesn't unpush the target. */ | |
566 | ||
e99b03dc | 567 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
568 | |
569 | parent_inf = current_inferior (); | |
570 | child_inf->attach_flag = parent_inf->attach_flag; | |
571 | copy_terminal_info (child_inf, parent_inf); | |
572 | child_inf->gdbarch = parent_inf->gdbarch; | |
573 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
574 | ||
575 | parent_pspace = parent_inf->pspace; | |
576 | ||
5b6d1e4f | 577 | process_stratum_target *target = parent_inf->process_target (); |
d83ad864 | 578 | |
5b6d1e4f PA |
579 | { |
580 | /* Hold a strong reference to the target while (maybe) | |
581 | detaching the parent. Otherwise detaching could close the | |
582 | target. */ | |
583 | auto target_ref = target_ops_ref::new_reference (target); | |
584 | ||
585 | /* If we're vforking, we want to hold on to the parent until | |
586 | the child exits or execs. At child exec or exit time we | |
587 | can remove the old breakpoints from the parent and detach | |
588 | or resume debugging it. Otherwise, detach the parent now; | |
589 | we'll want to reuse it's program/address spaces, but we | |
590 | can't set them to the child before removing breakpoints | |
591 | from the parent, otherwise, the breakpoints module could | |
592 | decide to remove breakpoints from the wrong process (since | |
593 | they'd be assigned to the same address space). */ | |
594 | ||
595 | if (has_vforked) | |
596 | { | |
597 | gdb_assert (child_inf->vfork_parent == NULL); | |
598 | gdb_assert (parent_inf->vfork_child == NULL); | |
599 | child_inf->vfork_parent = parent_inf; | |
600 | child_inf->pending_detach = 0; | |
601 | parent_inf->vfork_child = child_inf; | |
602 | parent_inf->pending_detach = detach_fork; | |
603 | parent_inf->waiting_for_vfork_done = 0; | |
604 | } | |
605 | else if (detach_fork) | |
606 | { | |
607 | if (print_inferior_events) | |
608 | { | |
609 | /* Ensure that we have a process ptid. */ | |
610 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
611 | ||
612 | target_terminal::ours_for_output (); | |
613 | fprintf_filtered (gdb_stdlog, | |
614 | _("[Detaching after fork from " | |
615 | "parent %s]\n"), | |
616 | target_pid_to_str (process_ptid).c_str ()); | |
617 | } | |
8dd06f7a | 618 | |
5b6d1e4f PA |
619 | target_detach (parent_inf, 0); |
620 | parent_inf = NULL; | |
621 | } | |
6f259a23 | 622 | |
5b6d1e4f | 623 | /* Note that the detach above makes PARENT_INF dangling. */ |
d83ad864 | 624 | |
5b6d1e4f PA |
625 | /* Add the child thread to the appropriate lists, and switch |
626 | to this new thread, before cloning the program space, and | |
627 | informing the solib layer about this new process. */ | |
d83ad864 | 628 | |
5b6d1e4f PA |
629 | set_current_inferior (child_inf); |
630 | push_target (target); | |
631 | } | |
d83ad864 | 632 | |
5b6d1e4f | 633 | add_thread_silent (target, child_ptid); |
79639e11 | 634 | inferior_ptid = child_ptid; |
d83ad864 DB |
635 | |
636 | /* If this is a vfork child, then the address-space is shared | |
637 | with the parent. If we detached from the parent, then we can | |
638 | reuse the parent's program/address spaces. */ | |
639 | if (has_vforked || detach_fork) | |
640 | { | |
641 | child_inf->pspace = parent_pspace; | |
642 | child_inf->aspace = child_inf->pspace->aspace; | |
5b6d1e4f PA |
643 | |
644 | exec_on_vfork (); | |
d83ad864 DB |
645 | } |
646 | else | |
647 | { | |
648 | child_inf->aspace = new_address_space (); | |
564b1e3f | 649 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
650 | child_inf->removable = 1; |
651 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
652 | set_current_program_space (child_inf->pspace); | |
653 | clone_program_space (child_inf->pspace, parent_pspace); | |
654 | ||
655 | /* Let the shared library layer (e.g., solib-svr4) learn | |
656 | about this new process, relocate the cloned exec, pull in | |
657 | shared libraries, and install the solib event breakpoint. | |
658 | If a "cloned-VM" event was propagated better throughout | |
659 | the core, this wouldn't be required. */ | |
660 | solib_create_inferior_hook (0); | |
661 | } | |
662 | } | |
663 | ||
664 | return target_follow_fork (follow_child, detach_fork); | |
665 | } | |
666 | ||
e58b0e63 PA |
667 | /* Tell the target to follow the fork we're stopped at. Returns true |
668 | if the inferior should be resumed; false, if the target for some | |
669 | reason decided it's best not to resume. */ | |
670 | ||
6604731b | 671 | static int |
4ef3f3be | 672 | follow_fork (void) |
c906108c | 673 | { |
ea1dd7bc | 674 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
675 | int should_resume = 1; |
676 | struct thread_info *tp; | |
677 | ||
678 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
679 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
680 | parent thread structure's run control related fields, not just these. |
681 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
682 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 683 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
684 | CORE_ADDR step_range_start = 0; |
685 | CORE_ADDR step_range_end = 0; | |
686 | struct frame_id step_frame_id = { 0 }; | |
8980e177 | 687 | struct thread_fsm *thread_fsm = NULL; |
e58b0e63 PA |
688 | |
689 | if (!non_stop) | |
690 | { | |
5b6d1e4f | 691 | process_stratum_target *wait_target; |
e58b0e63 PA |
692 | ptid_t wait_ptid; |
693 | struct target_waitstatus wait_status; | |
694 | ||
695 | /* Get the last target status returned by target_wait(). */ | |
5b6d1e4f | 696 | get_last_target_status (&wait_target, &wait_ptid, &wait_status); |
e58b0e63 PA |
697 | |
698 | /* If not stopped at a fork event, then there's nothing else to | |
699 | do. */ | |
700 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
701 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
702 | return 1; | |
703 | ||
704 | /* Check if we switched over from WAIT_PTID, since the event was | |
705 | reported. */ | |
00431a78 | 706 | if (wait_ptid != minus_one_ptid |
5b6d1e4f PA |
707 | && (current_inferior ()->process_target () != wait_target |
708 | || inferior_ptid != wait_ptid)) | |
e58b0e63 PA |
709 | { |
710 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
711 | target to follow it (in either direction). We'll | |
712 | afterwards refuse to resume, and inform the user what | |
713 | happened. */ | |
5b6d1e4f | 714 | thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid); |
00431a78 | 715 | switch_to_thread (wait_thread); |
e58b0e63 PA |
716 | should_resume = 0; |
717 | } | |
718 | } | |
719 | ||
720 | tp = inferior_thread (); | |
721 | ||
722 | /* If there were any forks/vforks that were caught and are now to be | |
723 | followed, then do so now. */ | |
724 | switch (tp->pending_follow.kind) | |
725 | { | |
726 | case TARGET_WAITKIND_FORKED: | |
727 | case TARGET_WAITKIND_VFORKED: | |
728 | { | |
729 | ptid_t parent, child; | |
730 | ||
731 | /* If the user did a next/step, etc, over a fork call, | |
732 | preserve the stepping state in the fork child. */ | |
733 | if (follow_child && should_resume) | |
734 | { | |
8358c15c JK |
735 | step_resume_breakpoint = clone_momentary_breakpoint |
736 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
737 | step_range_start = tp->control.step_range_start; |
738 | step_range_end = tp->control.step_range_end; | |
739 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
740 | exception_resume_breakpoint |
741 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 742 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
743 | |
744 | /* For now, delete the parent's sr breakpoint, otherwise, | |
745 | parent/child sr breakpoints are considered duplicates, | |
746 | and the child version will not be installed. Remove | |
747 | this when the breakpoints module becomes aware of | |
748 | inferiors and address spaces. */ | |
749 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
750 | tp->control.step_range_start = 0; |
751 | tp->control.step_range_end = 0; | |
752 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 753 | delete_exception_resume_breakpoint (tp); |
8980e177 | 754 | tp->thread_fsm = NULL; |
e58b0e63 PA |
755 | } |
756 | ||
757 | parent = inferior_ptid; | |
758 | child = tp->pending_follow.value.related_pid; | |
759 | ||
5b6d1e4f | 760 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
761 | /* Set up inferior(s) as specified by the caller, and tell the |
762 | target to do whatever is necessary to follow either parent | |
763 | or child. */ | |
764 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
765 | { |
766 | /* Target refused to follow, or there's some other reason | |
767 | we shouldn't resume. */ | |
768 | should_resume = 0; | |
769 | } | |
770 | else | |
771 | { | |
772 | /* This pending follow fork event is now handled, one way | |
773 | or another. The previous selected thread may be gone | |
774 | from the lists by now, but if it is still around, need | |
775 | to clear the pending follow request. */ | |
5b6d1e4f | 776 | tp = find_thread_ptid (parent_targ, parent); |
e58b0e63 PA |
777 | if (tp) |
778 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
779 | ||
780 | /* This makes sure we don't try to apply the "Switched | |
781 | over from WAIT_PID" logic above. */ | |
782 | nullify_last_target_wait_ptid (); | |
783 | ||
1777feb0 | 784 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
785 | if (follow_child) |
786 | { | |
5b6d1e4f | 787 | thread_info *child_thr = find_thread_ptid (parent_targ, child); |
00431a78 | 788 | switch_to_thread (child_thr); |
e58b0e63 PA |
789 | |
790 | /* ... and preserve the stepping state, in case the | |
791 | user was stepping over the fork call. */ | |
792 | if (should_resume) | |
793 | { | |
794 | tp = inferior_thread (); | |
8358c15c JK |
795 | tp->control.step_resume_breakpoint |
796 | = step_resume_breakpoint; | |
16c381f0 JK |
797 | tp->control.step_range_start = step_range_start; |
798 | tp->control.step_range_end = step_range_end; | |
799 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
800 | tp->control.exception_resume_breakpoint |
801 | = exception_resume_breakpoint; | |
8980e177 | 802 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
803 | } |
804 | else | |
805 | { | |
806 | /* If we get here, it was because we're trying to | |
807 | resume from a fork catchpoint, but, the user | |
808 | has switched threads away from the thread that | |
809 | forked. In that case, the resume command | |
810 | issued is most likely not applicable to the | |
811 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 812 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 813 | "before following fork child.")); |
e58b0e63 PA |
814 | } |
815 | ||
816 | /* Reset breakpoints in the child as appropriate. */ | |
817 | follow_inferior_reset_breakpoints (); | |
818 | } | |
e58b0e63 PA |
819 | } |
820 | } | |
821 | break; | |
822 | case TARGET_WAITKIND_SPURIOUS: | |
823 | /* Nothing to follow. */ | |
824 | break; | |
825 | default: | |
826 | internal_error (__FILE__, __LINE__, | |
827 | "Unexpected pending_follow.kind %d\n", | |
828 | tp->pending_follow.kind); | |
829 | break; | |
830 | } | |
c906108c | 831 | |
e58b0e63 | 832 | return should_resume; |
c906108c SS |
833 | } |
834 | ||
d83ad864 | 835 | static void |
6604731b | 836 | follow_inferior_reset_breakpoints (void) |
c906108c | 837 | { |
4e1c45ea PA |
838 | struct thread_info *tp = inferior_thread (); |
839 | ||
6604731b DJ |
840 | /* Was there a step_resume breakpoint? (There was if the user |
841 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
842 | thread number. Cloned step_resume breakpoints are disabled on |
843 | creation, so enable it here now that it is associated with the | |
844 | correct thread. | |
6604731b DJ |
845 | |
846 | step_resumes are a form of bp that are made to be per-thread. | |
847 | Since we created the step_resume bp when the parent process | |
848 | was being debugged, and now are switching to the child process, | |
849 | from the breakpoint package's viewpoint, that's a switch of | |
850 | "threads". We must update the bp's notion of which thread | |
851 | it is for, or it'll be ignored when it triggers. */ | |
852 | ||
8358c15c | 853 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
854 | { |
855 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
856 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
857 | } | |
6604731b | 858 | |
a1aa2221 | 859 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 860 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
861 | { |
862 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
863 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
864 | } | |
186c406b | 865 | |
6604731b DJ |
866 | /* Reinsert all breakpoints in the child. The user may have set |
867 | breakpoints after catching the fork, in which case those | |
868 | were never set in the child, but only in the parent. This makes | |
869 | sure the inserted breakpoints match the breakpoint list. */ | |
870 | ||
871 | breakpoint_re_set (); | |
872 | insert_breakpoints (); | |
c906108c | 873 | } |
c906108c | 874 | |
6c95b8df PA |
875 | /* The child has exited or execed: resume threads of the parent the |
876 | user wanted to be executing. */ | |
877 | ||
878 | static int | |
879 | proceed_after_vfork_done (struct thread_info *thread, | |
880 | void *arg) | |
881 | { | |
882 | int pid = * (int *) arg; | |
883 | ||
00431a78 PA |
884 | if (thread->ptid.pid () == pid |
885 | && thread->state == THREAD_RUNNING | |
886 | && !thread->executing | |
6c95b8df | 887 | && !thread->stop_requested |
a493e3e2 | 888 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df PA |
889 | { |
890 | if (debug_infrun) | |
891 | fprintf_unfiltered (gdb_stdlog, | |
892 | "infrun: resuming vfork parent thread %s\n", | |
a068643d | 893 | target_pid_to_str (thread->ptid).c_str ()); |
6c95b8df | 894 | |
00431a78 | 895 | switch_to_thread (thread); |
70509625 | 896 | clear_proceed_status (0); |
64ce06e4 | 897 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
898 | } |
899 | ||
900 | return 0; | |
901 | } | |
902 | ||
5ed8105e PA |
903 | /* Save/restore inferior_ptid, current program space and current |
904 | inferior. Only use this if the current context points at an exited | |
905 | inferior (and therefore there's no current thread to save). */ | |
906 | class scoped_restore_exited_inferior | |
907 | { | |
908 | public: | |
909 | scoped_restore_exited_inferior () | |
910 | : m_saved_ptid (&inferior_ptid) | |
911 | {} | |
912 | ||
913 | private: | |
914 | scoped_restore_tmpl<ptid_t> m_saved_ptid; | |
915 | scoped_restore_current_program_space m_pspace; | |
916 | scoped_restore_current_inferior m_inferior; | |
917 | }; | |
918 | ||
6c95b8df PA |
919 | /* Called whenever we notice an exec or exit event, to handle |
920 | detaching or resuming a vfork parent. */ | |
921 | ||
922 | static void | |
923 | handle_vfork_child_exec_or_exit (int exec) | |
924 | { | |
925 | struct inferior *inf = current_inferior (); | |
926 | ||
927 | if (inf->vfork_parent) | |
928 | { | |
929 | int resume_parent = -1; | |
930 | ||
931 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
932 | between the parent and the child. Break the bonds. */ |
933 | inferior *vfork_parent = inf->vfork_parent; | |
934 | inf->vfork_parent->vfork_child = NULL; | |
935 | inf->vfork_parent = NULL; | |
6c95b8df | 936 | |
b73715df TV |
937 | /* If the user wanted to detach from the parent, now is the |
938 | time. */ | |
939 | if (vfork_parent->pending_detach) | |
6c95b8df PA |
940 | { |
941 | struct thread_info *tp; | |
6c95b8df PA |
942 | struct program_space *pspace; |
943 | struct address_space *aspace; | |
944 | ||
1777feb0 | 945 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 946 | |
b73715df | 947 | vfork_parent->pending_detach = 0; |
68c9da30 | 948 | |
5ed8105e PA |
949 | gdb::optional<scoped_restore_exited_inferior> |
950 | maybe_restore_inferior; | |
951 | gdb::optional<scoped_restore_current_pspace_and_thread> | |
952 | maybe_restore_thread; | |
953 | ||
954 | /* If we're handling a child exit, then inferior_ptid points | |
955 | at the inferior's pid, not to a thread. */ | |
f50f4e56 | 956 | if (!exec) |
5ed8105e | 957 | maybe_restore_inferior.emplace (); |
f50f4e56 | 958 | else |
5ed8105e | 959 | maybe_restore_thread.emplace (); |
6c95b8df PA |
960 | |
961 | /* We're letting loose of the parent. */ | |
b73715df | 962 | tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 963 | switch_to_thread (tp); |
6c95b8df PA |
964 | |
965 | /* We're about to detach from the parent, which implicitly | |
966 | removes breakpoints from its address space. There's a | |
967 | catch here: we want to reuse the spaces for the child, | |
968 | but, parent/child are still sharing the pspace at this | |
969 | point, although the exec in reality makes the kernel give | |
970 | the child a fresh set of new pages. The problem here is | |
971 | that the breakpoints module being unaware of this, would | |
972 | likely chose the child process to write to the parent | |
973 | address space. Swapping the child temporarily away from | |
974 | the spaces has the desired effect. Yes, this is "sort | |
975 | of" a hack. */ | |
976 | ||
977 | pspace = inf->pspace; | |
978 | aspace = inf->aspace; | |
979 | inf->aspace = NULL; | |
980 | inf->pspace = NULL; | |
981 | ||
f67c0c91 | 982 | if (print_inferior_events) |
6c95b8df | 983 | { |
a068643d | 984 | std::string pidstr |
b73715df | 985 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 986 | |
223ffa71 | 987 | target_terminal::ours_for_output (); |
6c95b8df PA |
988 | |
989 | if (exec) | |
6f259a23 DB |
990 | { |
991 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 992 | _("[Detaching vfork parent %s " |
a068643d | 993 | "after child exec]\n"), pidstr.c_str ()); |
6f259a23 | 994 | } |
6c95b8df | 995 | else |
6f259a23 DB |
996 | { |
997 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 998 | _("[Detaching vfork parent %s " |
a068643d | 999 | "after child exit]\n"), pidstr.c_str ()); |
6f259a23 | 1000 | } |
6c95b8df PA |
1001 | } |
1002 | ||
b73715df | 1003 | target_detach (vfork_parent, 0); |
6c95b8df PA |
1004 | |
1005 | /* Put it back. */ | |
1006 | inf->pspace = pspace; | |
1007 | inf->aspace = aspace; | |
6c95b8df PA |
1008 | } |
1009 | else if (exec) | |
1010 | { | |
1011 | /* We're staying attached to the parent, so, really give the | |
1012 | child a new address space. */ | |
564b1e3f | 1013 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
1014 | inf->aspace = inf->pspace->aspace; |
1015 | inf->removable = 1; | |
1016 | set_current_program_space (inf->pspace); | |
1017 | ||
b73715df | 1018 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1019 | } |
1020 | else | |
1021 | { | |
6c95b8df PA |
1022 | struct program_space *pspace; |
1023 | ||
1024 | /* If this is a vfork child exiting, then the pspace and | |
1025 | aspaces were shared with the parent. Since we're | |
1026 | reporting the process exit, we'll be mourning all that is | |
1027 | found in the address space, and switching to null_ptid, | |
1028 | preparing to start a new inferior. But, since we don't | |
1029 | want to clobber the parent's address/program spaces, we | |
1030 | go ahead and create a new one for this exiting | |
1031 | inferior. */ | |
1032 | ||
5ed8105e PA |
1033 | /* Switch to null_ptid while running clone_program_space, so |
1034 | that clone_program_space doesn't want to read the | |
1035 | selected frame of a dead process. */ | |
1036 | scoped_restore restore_ptid | |
1037 | = make_scoped_restore (&inferior_ptid, null_ptid); | |
6c95b8df PA |
1038 | |
1039 | /* This inferior is dead, so avoid giving the breakpoints | |
1040 | module the option to write through to it (cloning a | |
1041 | program space resets breakpoints). */ | |
1042 | inf->aspace = NULL; | |
1043 | inf->pspace = NULL; | |
564b1e3f | 1044 | pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
1045 | set_current_program_space (pspace); |
1046 | inf->removable = 1; | |
7dcd53a0 | 1047 | inf->symfile_flags = SYMFILE_NO_READ; |
b73715df | 1048 | clone_program_space (pspace, vfork_parent->pspace); |
6c95b8df PA |
1049 | inf->pspace = pspace; |
1050 | inf->aspace = pspace->aspace; | |
1051 | ||
b73715df | 1052 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1053 | } |
1054 | ||
6c95b8df PA |
1055 | gdb_assert (current_program_space == inf->pspace); |
1056 | ||
1057 | if (non_stop && resume_parent != -1) | |
1058 | { | |
1059 | /* If the user wanted the parent to be running, let it go | |
1060 | free now. */ | |
5ed8105e | 1061 | scoped_restore_current_thread restore_thread; |
6c95b8df PA |
1062 | |
1063 | if (debug_infrun) | |
3e43a32a MS |
1064 | fprintf_unfiltered (gdb_stdlog, |
1065 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
1066 | resume_parent); |
1067 | ||
1068 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1069 | } |
1070 | } | |
1071 | } | |
1072 | ||
eb6c553b | 1073 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1074 | |
1075 | static const char follow_exec_mode_new[] = "new"; | |
1076 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1077 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1078 | { |
1079 | follow_exec_mode_new, | |
1080 | follow_exec_mode_same, | |
1081 | NULL, | |
1082 | }; | |
1083 | ||
1084 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1085 | static void | |
1086 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1087 | struct cmd_list_element *c, const char *value) | |
1088 | { | |
1089 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1090 | } | |
1091 | ||
ecf45d2c | 1092 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1093 | |
c906108c | 1094 | static void |
4ca51187 | 1095 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1096 | { |
6c95b8df | 1097 | struct inferior *inf = current_inferior (); |
e99b03dc | 1098 | int pid = ptid.pid (); |
94585166 | 1099 | ptid_t process_ptid; |
7a292a7a | 1100 | |
65d2b333 PW |
1101 | /* Switch terminal for any messages produced e.g. by |
1102 | breakpoint_re_set. */ | |
1103 | target_terminal::ours_for_output (); | |
1104 | ||
c906108c SS |
1105 | /* This is an exec event that we actually wish to pay attention to. |
1106 | Refresh our symbol table to the newly exec'd program, remove any | |
1107 | momentary bp's, etc. | |
1108 | ||
1109 | If there are breakpoints, they aren't really inserted now, | |
1110 | since the exec() transformed our inferior into a fresh set | |
1111 | of instructions. | |
1112 | ||
1113 | We want to preserve symbolic breakpoints on the list, since | |
1114 | we have hopes that they can be reset after the new a.out's | |
1115 | symbol table is read. | |
1116 | ||
1117 | However, any "raw" breakpoints must be removed from the list | |
1118 | (e.g., the solib bp's), since their address is probably invalid | |
1119 | now. | |
1120 | ||
1121 | And, we DON'T want to call delete_breakpoints() here, since | |
1122 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1123 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1124 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1125 | |
1126 | mark_breakpoints_out (); | |
1127 | ||
95e50b27 PA |
1128 | /* The target reports the exec event to the main thread, even if |
1129 | some other thread does the exec, and even if the main thread was | |
1130 | stopped or already gone. We may still have non-leader threads of | |
1131 | the process on our list. E.g., on targets that don't have thread | |
1132 | exit events (like remote); or on native Linux in non-stop mode if | |
1133 | there were only two threads in the inferior and the non-leader | |
1134 | one is the one that execs (and nothing forces an update of the | |
1135 | thread list up to here). When debugging remotely, it's best to | |
1136 | avoid extra traffic, when possible, so avoid syncing the thread | |
1137 | list with the target, and instead go ahead and delete all threads | |
1138 | of the process but one that reported the event. Note this must | |
1139 | be done before calling update_breakpoints_after_exec, as | |
1140 | otherwise clearing the threads' resources would reference stale | |
1141 | thread breakpoints -- it may have been one of these threads that | |
1142 | stepped across the exec. We could just clear their stepping | |
1143 | states, but as long as we're iterating, might as well delete | |
1144 | them. Deleting them now rather than at the next user-visible | |
1145 | stop provides a nicer sequence of events for user and MI | |
1146 | notifications. */ | |
08036331 | 1147 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1148 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1149 | delete_thread (th); |
95e50b27 PA |
1150 | |
1151 | /* We also need to clear any left over stale state for the | |
1152 | leader/event thread. E.g., if there was any step-resume | |
1153 | breakpoint or similar, it's gone now. We cannot truly | |
1154 | step-to-next statement through an exec(). */ | |
08036331 | 1155 | thread_info *th = inferior_thread (); |
8358c15c | 1156 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1157 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1158 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1159 | th->control.step_range_start = 0; |
1160 | th->control.step_range_end = 0; | |
c906108c | 1161 | |
95e50b27 PA |
1162 | /* The user may have had the main thread held stopped in the |
1163 | previous image (e.g., schedlock on, or non-stop). Release | |
1164 | it now. */ | |
a75724bc PA |
1165 | th->stop_requested = 0; |
1166 | ||
95e50b27 PA |
1167 | update_breakpoints_after_exec (); |
1168 | ||
1777feb0 | 1169 | /* What is this a.out's name? */ |
f2907e49 | 1170 | process_ptid = ptid_t (pid); |
6c95b8df | 1171 | printf_unfiltered (_("%s is executing new program: %s\n"), |
a068643d | 1172 | target_pid_to_str (process_ptid).c_str (), |
ecf45d2c | 1173 | exec_file_target); |
c906108c SS |
1174 | |
1175 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1176 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1177 | |
6ca15a4b | 1178 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1179 | |
797bc1cb TT |
1180 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1181 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1182 | |
ecf45d2c SL |
1183 | /* If we were unable to map the executable target pathname onto a host |
1184 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1185 | is confusing. Maybe it would even be better to stop at this point | |
1186 | so that the user can specify a file manually before continuing. */ | |
1187 | if (exec_file_host == NULL) | |
1188 | warning (_("Could not load symbols for executable %s.\n" | |
1189 | "Do you need \"set sysroot\"?"), | |
1190 | exec_file_target); | |
c906108c | 1191 | |
cce9b6bf PA |
1192 | /* Reset the shared library package. This ensures that we get a |
1193 | shlib event when the child reaches "_start", at which point the | |
1194 | dld will have had a chance to initialize the child. */ | |
1195 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1196 | we don't want those to be satisfied by the libraries of the | |
1197 | previous incarnation of this process. */ | |
1198 | no_shared_libraries (NULL, 0); | |
1199 | ||
6c95b8df PA |
1200 | if (follow_exec_mode_string == follow_exec_mode_new) |
1201 | { | |
6c95b8df PA |
1202 | /* The user wants to keep the old inferior and program spaces |
1203 | around. Create a new fresh one, and switch to it. */ | |
1204 | ||
35ed81d4 SM |
1205 | /* Do exit processing for the original inferior before setting the new |
1206 | inferior's pid. Having two inferiors with the same pid would confuse | |
1207 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1208 | old to the new inferior. */ | |
1209 | inf = add_inferior_with_spaces (); | |
1210 | swap_terminal_info (inf, current_inferior ()); | |
057302ce | 1211 | exit_inferior_silent (current_inferior ()); |
17d8546e | 1212 | |
94585166 | 1213 | inf->pid = pid; |
ecf45d2c | 1214 | target_follow_exec (inf, exec_file_target); |
6c95b8df | 1215 | |
5b6d1e4f PA |
1216 | inferior *org_inferior = current_inferior (); |
1217 | switch_to_inferior_no_thread (inf); | |
1218 | push_target (org_inferior->process_target ()); | |
1219 | thread_info *thr = add_thread (inf->process_target (), ptid); | |
1220 | switch_to_thread (thr); | |
6c95b8df | 1221 | } |
9107fc8d PA |
1222 | else |
1223 | { | |
1224 | /* The old description may no longer be fit for the new image. | |
1225 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1226 | old description; we'll read a new one below. No need to do | |
1227 | this on "follow-exec-mode new", as the old inferior stays | |
1228 | around (its description is later cleared/refetched on | |
1229 | restart). */ | |
1230 | target_clear_description (); | |
1231 | } | |
6c95b8df PA |
1232 | |
1233 | gdb_assert (current_program_space == inf->pspace); | |
1234 | ||
ecf45d2c SL |
1235 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1236 | because the proper displacement for a PIE (Position Independent | |
1237 | Executable) main symbol file will only be computed by | |
1238 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1239 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1240 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1241 | |
9107fc8d PA |
1242 | /* If the target can specify a description, read it. Must do this |
1243 | after flipping to the new executable (because the target supplied | |
1244 | description must be compatible with the executable's | |
1245 | architecture, and the old executable may e.g., be 32-bit, while | |
1246 | the new one 64-bit), and before anything involving memory or | |
1247 | registers. */ | |
1248 | target_find_description (); | |
1249 | ||
268a4a75 | 1250 | solib_create_inferior_hook (0); |
c906108c | 1251 | |
4efc6507 DE |
1252 | jit_inferior_created_hook (); |
1253 | ||
c1e56572 JK |
1254 | breakpoint_re_set (); |
1255 | ||
c906108c SS |
1256 | /* Reinsert all breakpoints. (Those which were symbolic have |
1257 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1258 | to symbol_file_command...). */ |
c906108c SS |
1259 | insert_breakpoints (); |
1260 | ||
1261 | /* The next resume of this inferior should bring it to the shlib | |
1262 | startup breakpoints. (If the user had also set bp's on | |
1263 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1264 | matically get reset there in the new process.). */ |
c906108c SS |
1265 | } |
1266 | ||
c2829269 PA |
1267 | /* The queue of threads that need to do a step-over operation to get |
1268 | past e.g., a breakpoint. What technique is used to step over the | |
1269 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1270 | same queue, to maintain rough temporal order of execution, in order | |
1271 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1272 | constantly stepping the same couple threads past their breakpoints | |
1273 | over and over, if the single-step finish fast enough. */ | |
1274 | struct thread_info *step_over_queue_head; | |
1275 | ||
6c4cfb24 PA |
1276 | /* Bit flags indicating what the thread needs to step over. */ |
1277 | ||
8d297bbf | 1278 | enum step_over_what_flag |
6c4cfb24 PA |
1279 | { |
1280 | /* Step over a breakpoint. */ | |
1281 | STEP_OVER_BREAKPOINT = 1, | |
1282 | ||
1283 | /* Step past a non-continuable watchpoint, in order to let the | |
1284 | instruction execute so we can evaluate the watchpoint | |
1285 | expression. */ | |
1286 | STEP_OVER_WATCHPOINT = 2 | |
1287 | }; | |
8d297bbf | 1288 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1289 | |
963f9c80 | 1290 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1291 | |
1292 | struct step_over_info | |
1293 | { | |
963f9c80 PA |
1294 | /* If we're stepping past a breakpoint, this is the address space |
1295 | and address of the instruction the breakpoint is set at. We'll | |
1296 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1297 | non-NULL. */ | |
8b86c959 | 1298 | const address_space *aspace; |
31e77af2 | 1299 | CORE_ADDR address; |
963f9c80 PA |
1300 | |
1301 | /* The instruction being stepped over triggers a nonsteppable | |
1302 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1303 | int nonsteppable_watchpoint_p; | |
21edc42f YQ |
1304 | |
1305 | /* The thread's global number. */ | |
1306 | int thread; | |
31e77af2 PA |
1307 | }; |
1308 | ||
1309 | /* The step-over info of the location that is being stepped over. | |
1310 | ||
1311 | Note that with async/breakpoint always-inserted mode, a user might | |
1312 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1313 | being stepped over. As setting a new breakpoint inserts all | |
1314 | breakpoints, we need to make sure the breakpoint being stepped over | |
1315 | isn't inserted then. We do that by only clearing the step-over | |
1316 | info when the step-over is actually finished (or aborted). | |
1317 | ||
1318 | Presently GDB can only step over one breakpoint at any given time. | |
1319 | Given threads that can't run code in the same address space as the | |
1320 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1321 | to step-over at most one breakpoint per address space (so this info | |
1322 | could move to the address space object if/when GDB is extended). | |
1323 | The set of breakpoints being stepped over will normally be much | |
1324 | smaller than the set of all breakpoints, so a flag in the | |
1325 | breakpoint location structure would be wasteful. A separate list | |
1326 | also saves complexity and run-time, as otherwise we'd have to go | |
1327 | through all breakpoint locations clearing their flag whenever we | |
1328 | start a new sequence. Similar considerations weigh against storing | |
1329 | this info in the thread object. Plus, not all step overs actually | |
1330 | have breakpoint locations -- e.g., stepping past a single-step | |
1331 | breakpoint, or stepping to complete a non-continuable | |
1332 | watchpoint. */ | |
1333 | static struct step_over_info step_over_info; | |
1334 | ||
1335 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1336 | stepping over. |
1337 | N.B. We record the aspace and address now, instead of say just the thread, | |
1338 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1339 | |
1340 | static void | |
8b86c959 | 1341 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1342 | int nonsteppable_watchpoint_p, |
1343 | int thread) | |
31e77af2 PA |
1344 | { |
1345 | step_over_info.aspace = aspace; | |
1346 | step_over_info.address = address; | |
963f9c80 | 1347 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1348 | step_over_info.thread = thread; |
31e77af2 PA |
1349 | } |
1350 | ||
1351 | /* Called when we're not longer stepping over a breakpoint / an | |
1352 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1353 | ||
1354 | static void | |
1355 | clear_step_over_info (void) | |
1356 | { | |
372316f1 PA |
1357 | if (debug_infrun) |
1358 | fprintf_unfiltered (gdb_stdlog, | |
1359 | "infrun: clear_step_over_info\n"); | |
31e77af2 PA |
1360 | step_over_info.aspace = NULL; |
1361 | step_over_info.address = 0; | |
963f9c80 | 1362 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1363 | step_over_info.thread = -1; |
31e77af2 PA |
1364 | } |
1365 | ||
7f89fd65 | 1366 | /* See infrun.h. */ |
31e77af2 PA |
1367 | |
1368 | int | |
1369 | stepping_past_instruction_at (struct address_space *aspace, | |
1370 | CORE_ADDR address) | |
1371 | { | |
1372 | return (step_over_info.aspace != NULL | |
1373 | && breakpoint_address_match (aspace, address, | |
1374 | step_over_info.aspace, | |
1375 | step_over_info.address)); | |
1376 | } | |
1377 | ||
963f9c80 PA |
1378 | /* See infrun.h. */ |
1379 | ||
21edc42f YQ |
1380 | int |
1381 | thread_is_stepping_over_breakpoint (int thread) | |
1382 | { | |
1383 | return (step_over_info.thread != -1 | |
1384 | && thread == step_over_info.thread); | |
1385 | } | |
1386 | ||
1387 | /* See infrun.h. */ | |
1388 | ||
963f9c80 PA |
1389 | int |
1390 | stepping_past_nonsteppable_watchpoint (void) | |
1391 | { | |
1392 | return step_over_info.nonsteppable_watchpoint_p; | |
1393 | } | |
1394 | ||
6cc83d2a PA |
1395 | /* Returns true if step-over info is valid. */ |
1396 | ||
1397 | static int | |
1398 | step_over_info_valid_p (void) | |
1399 | { | |
963f9c80 PA |
1400 | return (step_over_info.aspace != NULL |
1401 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1402 | } |
1403 | ||
c906108c | 1404 | \f |
237fc4c9 PA |
1405 | /* Displaced stepping. */ |
1406 | ||
1407 | /* In non-stop debugging mode, we must take special care to manage | |
1408 | breakpoints properly; in particular, the traditional strategy for | |
1409 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1410 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1411 | breakpoint it has hit while ensuring that other threads running | |
1412 | concurrently will hit the breakpoint as they should. | |
1413 | ||
1414 | The traditional way to step a thread T off a breakpoint in a | |
1415 | multi-threaded program in all-stop mode is as follows: | |
1416 | ||
1417 | a0) Initially, all threads are stopped, and breakpoints are not | |
1418 | inserted. | |
1419 | a1) We single-step T, leaving breakpoints uninserted. | |
1420 | a2) We insert breakpoints, and resume all threads. | |
1421 | ||
1422 | In non-stop debugging, however, this strategy is unsuitable: we | |
1423 | don't want to have to stop all threads in the system in order to | |
1424 | continue or step T past a breakpoint. Instead, we use displaced | |
1425 | stepping: | |
1426 | ||
1427 | n0) Initially, T is stopped, other threads are running, and | |
1428 | breakpoints are inserted. | |
1429 | n1) We copy the instruction "under" the breakpoint to a separate | |
1430 | location, outside the main code stream, making any adjustments | |
1431 | to the instruction, register, and memory state as directed by | |
1432 | T's architecture. | |
1433 | n2) We single-step T over the instruction at its new location. | |
1434 | n3) We adjust the resulting register and memory state as directed | |
1435 | by T's architecture. This includes resetting T's PC to point | |
1436 | back into the main instruction stream. | |
1437 | n4) We resume T. | |
1438 | ||
1439 | This approach depends on the following gdbarch methods: | |
1440 | ||
1441 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1442 | indicate where to copy the instruction, and how much space must | |
1443 | be reserved there. We use these in step n1. | |
1444 | ||
1445 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1446 | address, and makes any necessary adjustments to the instruction, | |
1447 | register contents, and memory. We use this in step n1. | |
1448 | ||
1449 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1450 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1451 | same effect the instruction would have had if we had executed it |
1452 | at its original address. We use this in step n3. | |
1453 | ||
237fc4c9 PA |
1454 | The gdbarch_displaced_step_copy_insn and |
1455 | gdbarch_displaced_step_fixup functions must be written so that | |
1456 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1457 | single-stepping across the copied instruction, and then applying | |
1458 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1459 | thread's memory and registers as stepping the instruction in place | |
1460 | would have. Exactly which responsibilities fall to the copy and | |
1461 | which fall to the fixup is up to the author of those functions. | |
1462 | ||
1463 | See the comments in gdbarch.sh for details. | |
1464 | ||
1465 | Note that displaced stepping and software single-step cannot | |
1466 | currently be used in combination, although with some care I think | |
1467 | they could be made to. Software single-step works by placing | |
1468 | breakpoints on all possible subsequent instructions; if the | |
1469 | displaced instruction is a PC-relative jump, those breakpoints | |
1470 | could fall in very strange places --- on pages that aren't | |
1471 | executable, or at addresses that are not proper instruction | |
1472 | boundaries. (We do generally let other threads run while we wait | |
1473 | to hit the software single-step breakpoint, and they might | |
1474 | encounter such a corrupted instruction.) One way to work around | |
1475 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1476 | simulate the effect of PC-relative instructions (and return NULL) | |
1477 | on architectures that use software single-stepping. | |
1478 | ||
1479 | In non-stop mode, we can have independent and simultaneous step | |
1480 | requests, so more than one thread may need to simultaneously step | |
1481 | over a breakpoint. The current implementation assumes there is | |
1482 | only one scratch space per process. In this case, we have to | |
1483 | serialize access to the scratch space. If thread A wants to step | |
1484 | over a breakpoint, but we are currently waiting for some other | |
1485 | thread to complete a displaced step, we leave thread A stopped and | |
1486 | place it in the displaced_step_request_queue. Whenever a displaced | |
1487 | step finishes, we pick the next thread in the queue and start a new | |
1488 | displaced step operation on it. See displaced_step_prepare and | |
1489 | displaced_step_fixup for details. */ | |
1490 | ||
cfba9872 SM |
1491 | /* Default destructor for displaced_step_closure. */ |
1492 | ||
1493 | displaced_step_closure::~displaced_step_closure () = default; | |
1494 | ||
fc1cf338 PA |
1495 | /* Get the displaced stepping state of process PID. */ |
1496 | ||
39a36629 | 1497 | static displaced_step_inferior_state * |
00431a78 | 1498 | get_displaced_stepping_state (inferior *inf) |
fc1cf338 | 1499 | { |
d20172fc | 1500 | return &inf->displaced_step_state; |
fc1cf338 PA |
1501 | } |
1502 | ||
372316f1 PA |
1503 | /* Returns true if any inferior has a thread doing a displaced |
1504 | step. */ | |
1505 | ||
39a36629 SM |
1506 | static bool |
1507 | displaced_step_in_progress_any_inferior () | |
372316f1 | 1508 | { |
d20172fc | 1509 | for (inferior *i : all_inferiors ()) |
39a36629 | 1510 | { |
d20172fc | 1511 | if (i->displaced_step_state.step_thread != nullptr) |
39a36629 SM |
1512 | return true; |
1513 | } | |
372316f1 | 1514 | |
39a36629 | 1515 | return false; |
372316f1 PA |
1516 | } |
1517 | ||
c0987663 YQ |
1518 | /* Return true if thread represented by PTID is doing a displaced |
1519 | step. */ | |
1520 | ||
1521 | static int | |
00431a78 | 1522 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1523 | { |
00431a78 | 1524 | gdb_assert (thread != NULL); |
c0987663 | 1525 | |
d20172fc | 1526 | return get_displaced_stepping_state (thread->inf)->step_thread == thread; |
c0987663 YQ |
1527 | } |
1528 | ||
8f572e5c PA |
1529 | /* Return true if process PID has a thread doing a displaced step. */ |
1530 | ||
1531 | static int | |
00431a78 | 1532 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1533 | { |
d20172fc | 1534 | return get_displaced_stepping_state (inf)->step_thread != nullptr; |
fc1cf338 PA |
1535 | } |
1536 | ||
a42244db YQ |
1537 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1538 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1539 | return NULL. */ | |
1540 | ||
1541 | struct displaced_step_closure* | |
1542 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1543 | { | |
d20172fc | 1544 | displaced_step_inferior_state *displaced |
00431a78 | 1545 | = get_displaced_stepping_state (current_inferior ()); |
a42244db YQ |
1546 | |
1547 | /* If checking the mode of displaced instruction in copy area. */ | |
d20172fc | 1548 | if (displaced->step_thread != nullptr |
00431a78 | 1549 | && displaced->step_copy == addr) |
a42244db YQ |
1550 | return displaced->step_closure; |
1551 | ||
1552 | return NULL; | |
1553 | } | |
1554 | ||
fc1cf338 PA |
1555 | static void |
1556 | infrun_inferior_exit (struct inferior *inf) | |
1557 | { | |
d20172fc | 1558 | inf->displaced_step_state.reset (); |
fc1cf338 | 1559 | } |
237fc4c9 | 1560 | |
fff08868 HZ |
1561 | /* If ON, and the architecture supports it, GDB will use displaced |
1562 | stepping to step over breakpoints. If OFF, or if the architecture | |
1563 | doesn't support it, GDB will instead use the traditional | |
1564 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1565 | decide which technique to use to step over breakpoints depending on | |
1566 | which of all-stop or non-stop mode is active --- displaced stepping | |
1567 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1568 | ||
72d0e2c5 | 1569 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1570 | |
237fc4c9 PA |
1571 | static void |
1572 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1573 | struct cmd_list_element *c, | |
1574 | const char *value) | |
1575 | { | |
72d0e2c5 | 1576 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1577 | fprintf_filtered (file, |
1578 | _("Debugger's willingness to use displaced stepping " | |
1579 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1580 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1581 | else |
3e43a32a MS |
1582 | fprintf_filtered (file, |
1583 | _("Debugger's willingness to use displaced stepping " | |
1584 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1585 | } |
1586 | ||
fff08868 | 1587 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1588 | over breakpoints of thread TP. */ |
fff08868 | 1589 | |
237fc4c9 | 1590 | static int |
3fc8eb30 | 1591 | use_displaced_stepping (struct thread_info *tp) |
237fc4c9 | 1592 | { |
00431a78 | 1593 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1594 | struct gdbarch *gdbarch = regcache->arch (); |
d20172fc SM |
1595 | displaced_step_inferior_state *displaced_state |
1596 | = get_displaced_stepping_state (tp->inf); | |
3fc8eb30 | 1597 | |
fbea99ea PA |
1598 | return (((can_use_displaced_stepping == AUTO_BOOLEAN_AUTO |
1599 | && target_is_non_stop_p ()) | |
72d0e2c5 | 1600 | || can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) |
96429cc8 | 1601 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
3fc8eb30 | 1602 | && find_record_target () == NULL |
d20172fc | 1603 | && !displaced_state->failed_before); |
237fc4c9 PA |
1604 | } |
1605 | ||
1606 | /* Clean out any stray displaced stepping state. */ | |
1607 | static void | |
fc1cf338 | 1608 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1609 | { |
1610 | /* Indicate that there is no cleanup pending. */ | |
00431a78 | 1611 | displaced->step_thread = nullptr; |
237fc4c9 | 1612 | |
cfba9872 | 1613 | delete displaced->step_closure; |
6d45d4b4 | 1614 | displaced->step_closure = NULL; |
237fc4c9 PA |
1615 | } |
1616 | ||
9799571e TT |
1617 | /* A cleanup that wraps displaced_step_clear. */ |
1618 | using displaced_step_clear_cleanup | |
1619 | = FORWARD_SCOPE_EXIT (displaced_step_clear); | |
237fc4c9 PA |
1620 | |
1621 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1622 | void | |
1623 | displaced_step_dump_bytes (struct ui_file *file, | |
1624 | const gdb_byte *buf, | |
1625 | size_t len) | |
1626 | { | |
1627 | int i; | |
1628 | ||
1629 | for (i = 0; i < len; i++) | |
1630 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1631 | fputs_unfiltered ("\n", file); | |
1632 | } | |
1633 | ||
1634 | /* Prepare to single-step, using displaced stepping. | |
1635 | ||
1636 | Note that we cannot use displaced stepping when we have a signal to | |
1637 | deliver. If we have a signal to deliver and an instruction to step | |
1638 | over, then after the step, there will be no indication from the | |
1639 | target whether the thread entered a signal handler or ignored the | |
1640 | signal and stepped over the instruction successfully --- both cases | |
1641 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1642 | fixup, and in the second case we must --- but we can't tell which. | |
1643 | Comments in the code for 'random signals' in handle_inferior_event | |
1644 | explain how we handle this case instead. | |
1645 | ||
1646 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1647 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1648 | if this instruction can't be displaced stepped. */ | |
1649 | ||
237fc4c9 | 1650 | static int |
00431a78 | 1651 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1652 | { |
00431a78 | 1653 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1654 | struct gdbarch *gdbarch = regcache->arch (); |
8b86c959 | 1655 | const address_space *aspace = regcache->aspace (); |
237fc4c9 PA |
1656 | CORE_ADDR original, copy; |
1657 | ULONGEST len; | |
1658 | struct displaced_step_closure *closure; | |
9e529e1d | 1659 | int status; |
237fc4c9 PA |
1660 | |
1661 | /* We should never reach this function if the architecture does not | |
1662 | support displaced stepping. */ | |
1663 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1664 | ||
c2829269 PA |
1665 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1666 | gdb_assert (tp->control.trap_expected); | |
1667 | ||
c1e36e3e PA |
1668 | /* Disable range stepping while executing in the scratch pad. We |
1669 | want a single-step even if executing the displaced instruction in | |
1670 | the scratch buffer lands within the stepping range (e.g., a | |
1671 | jump/branch). */ | |
1672 | tp->control.may_range_step = 0; | |
1673 | ||
fc1cf338 PA |
1674 | /* We have to displaced step one thread at a time, as we only have |
1675 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1676 | |
d20172fc SM |
1677 | displaced_step_inferior_state *displaced |
1678 | = get_displaced_stepping_state (tp->inf); | |
fc1cf338 | 1679 | |
00431a78 | 1680 | if (displaced->step_thread != nullptr) |
237fc4c9 PA |
1681 | { |
1682 | /* Already waiting for a displaced step to finish. Defer this | |
1683 | request and place in queue. */ | |
237fc4c9 PA |
1684 | |
1685 | if (debug_displaced) | |
1686 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1687 | "displaced: deferring step of %s\n", |
a068643d | 1688 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 | 1689 | |
c2829269 | 1690 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1691 | return 0; |
1692 | } | |
1693 | else | |
1694 | { | |
1695 | if (debug_displaced) | |
1696 | fprintf_unfiltered (gdb_stdlog, | |
1697 | "displaced: stepping %s now\n", | |
a068643d | 1698 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 PA |
1699 | } |
1700 | ||
fc1cf338 | 1701 | displaced_step_clear (displaced); |
237fc4c9 | 1702 | |
00431a78 PA |
1703 | scoped_restore_current_thread restore_thread; |
1704 | ||
1705 | switch_to_thread (tp); | |
ad53cd71 | 1706 | |
515630c5 | 1707 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1708 | |
1709 | copy = gdbarch_displaced_step_location (gdbarch); | |
1710 | len = gdbarch_max_insn_length (gdbarch); | |
1711 | ||
d35ae833 PA |
1712 | if (breakpoint_in_range_p (aspace, copy, len)) |
1713 | { | |
1714 | /* There's a breakpoint set in the scratch pad location range | |
1715 | (which is usually around the entry point). We'd either | |
1716 | install it before resuming, which would overwrite/corrupt the | |
1717 | scratch pad, or if it was already inserted, this displaced | |
1718 | step would overwrite it. The latter is OK in the sense that | |
1719 | we already assume that no thread is going to execute the code | |
1720 | in the scratch pad range (after initial startup) anyway, but | |
1721 | the former is unacceptable. Simply punt and fallback to | |
1722 | stepping over this breakpoint in-line. */ | |
1723 | if (debug_displaced) | |
1724 | { | |
1725 | fprintf_unfiltered (gdb_stdlog, | |
1726 | "displaced: breakpoint set in scratch pad. " | |
1727 | "Stepping over breakpoint in-line instead.\n"); | |
1728 | } | |
1729 | ||
d35ae833 PA |
1730 | return -1; |
1731 | } | |
1732 | ||
237fc4c9 | 1733 | /* Save the original contents of the copy area. */ |
d20172fc SM |
1734 | displaced->step_saved_copy.resize (len); |
1735 | status = target_read_memory (copy, displaced->step_saved_copy.data (), len); | |
9e529e1d JK |
1736 | if (status != 0) |
1737 | throw_error (MEMORY_ERROR, | |
1738 | _("Error accessing memory address %s (%s) for " | |
1739 | "displaced-stepping scratch space."), | |
1740 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1741 | if (debug_displaced) |
1742 | { | |
5af949e3 UW |
1743 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1744 | paddress (gdbarch, copy)); | |
fc1cf338 | 1745 | displaced_step_dump_bytes (gdb_stdlog, |
d20172fc | 1746 | displaced->step_saved_copy.data (), |
fc1cf338 | 1747 | len); |
237fc4c9 PA |
1748 | }; |
1749 | ||
1750 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1751 | original, copy, regcache); |
7f03bd92 PA |
1752 | if (closure == NULL) |
1753 | { | |
1754 | /* The architecture doesn't know how or want to displaced step | |
1755 | this instruction or instruction sequence. Fallback to | |
1756 | stepping over the breakpoint in-line. */ | |
7f03bd92 PA |
1757 | return -1; |
1758 | } | |
237fc4c9 | 1759 | |
9f5a595d UW |
1760 | /* Save the information we need to fix things up if the step |
1761 | succeeds. */ | |
00431a78 | 1762 | displaced->step_thread = tp; |
fc1cf338 PA |
1763 | displaced->step_gdbarch = gdbarch; |
1764 | displaced->step_closure = closure; | |
1765 | displaced->step_original = original; | |
1766 | displaced->step_copy = copy; | |
9f5a595d | 1767 | |
9799571e TT |
1768 | { |
1769 | displaced_step_clear_cleanup cleanup (displaced); | |
237fc4c9 | 1770 | |
9799571e TT |
1771 | /* Resume execution at the copy. */ |
1772 | regcache_write_pc (regcache, copy); | |
237fc4c9 | 1773 | |
9799571e TT |
1774 | cleanup.release (); |
1775 | } | |
ad53cd71 | 1776 | |
237fc4c9 | 1777 | if (debug_displaced) |
5af949e3 UW |
1778 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1779 | paddress (gdbarch, copy)); | |
237fc4c9 | 1780 | |
237fc4c9 PA |
1781 | return 1; |
1782 | } | |
1783 | ||
3fc8eb30 PA |
1784 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1785 | attempts at displaced stepping if we get a memory error. */ | |
1786 | ||
1787 | static int | |
00431a78 | 1788 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 PA |
1789 | { |
1790 | int prepared = -1; | |
1791 | ||
a70b8144 | 1792 | try |
3fc8eb30 | 1793 | { |
00431a78 | 1794 | prepared = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1795 | } |
230d2906 | 1796 | catch (const gdb_exception_error &ex) |
3fc8eb30 PA |
1797 | { |
1798 | struct displaced_step_inferior_state *displaced_state; | |
1799 | ||
16b41842 PA |
1800 | if (ex.error != MEMORY_ERROR |
1801 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1802 | throw; |
3fc8eb30 PA |
1803 | |
1804 | if (debug_infrun) | |
1805 | { | |
1806 | fprintf_unfiltered (gdb_stdlog, | |
1807 | "infrun: disabling displaced stepping: %s\n", | |
3d6e9d23 | 1808 | ex.what ()); |
3fc8eb30 PA |
1809 | } |
1810 | ||
1811 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1812 | "auto". */ | |
1813 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1814 | { | |
fd7dcb94 | 1815 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1816 | ex.what ()); |
3fc8eb30 PA |
1817 | } |
1818 | ||
1819 | /* Disable further displaced stepping attempts. */ | |
1820 | displaced_state | |
00431a78 | 1821 | = get_displaced_stepping_state (thread->inf); |
3fc8eb30 PA |
1822 | displaced_state->failed_before = 1; |
1823 | } | |
3fc8eb30 PA |
1824 | |
1825 | return prepared; | |
1826 | } | |
1827 | ||
237fc4c9 | 1828 | static void |
3e43a32a MS |
1829 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1830 | const gdb_byte *myaddr, int len) | |
237fc4c9 | 1831 | { |
2989a365 | 1832 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
abbb1732 | 1833 | |
237fc4c9 PA |
1834 | inferior_ptid = ptid; |
1835 | write_memory (memaddr, myaddr, len); | |
237fc4c9 PA |
1836 | } |
1837 | ||
e2d96639 YQ |
1838 | /* Restore the contents of the copy area for thread PTID. */ |
1839 | ||
1840 | static void | |
1841 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1842 | ptid_t ptid) | |
1843 | { | |
1844 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1845 | ||
1846 | write_memory_ptid (ptid, displaced->step_copy, | |
d20172fc | 1847 | displaced->step_saved_copy.data (), len); |
e2d96639 YQ |
1848 | if (debug_displaced) |
1849 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
a068643d | 1850 | target_pid_to_str (ptid).c_str (), |
e2d96639 YQ |
1851 | paddress (displaced->step_gdbarch, |
1852 | displaced->step_copy)); | |
1853 | } | |
1854 | ||
372316f1 PA |
1855 | /* If we displaced stepped an instruction successfully, adjust |
1856 | registers and memory to yield the same effect the instruction would | |
1857 | have had if we had executed it at its original address, and return | |
1858 | 1. If the instruction didn't complete, relocate the PC and return | |
1859 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1860 | ||
1861 | static int | |
00431a78 | 1862 | displaced_step_fixup (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1863 | { |
fc1cf338 | 1864 | struct displaced_step_inferior_state *displaced |
00431a78 | 1865 | = get_displaced_stepping_state (event_thread->inf); |
372316f1 | 1866 | int ret; |
fc1cf338 | 1867 | |
00431a78 PA |
1868 | /* Was this event for the thread we displaced? */ |
1869 | if (displaced->step_thread != event_thread) | |
372316f1 | 1870 | return 0; |
237fc4c9 | 1871 | |
9799571e | 1872 | displaced_step_clear_cleanup cleanup (displaced); |
237fc4c9 | 1873 | |
00431a78 | 1874 | displaced_step_restore (displaced, displaced->step_thread->ptid); |
237fc4c9 | 1875 | |
cb71640d PA |
1876 | /* Fixup may need to read memory/registers. Switch to the thread |
1877 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
1878 | the current thread. */ | |
00431a78 | 1879 | switch_to_thread (event_thread); |
cb71640d | 1880 | |
237fc4c9 | 1881 | /* Did the instruction complete successfully? */ |
cb71640d PA |
1882 | if (signal == GDB_SIGNAL_TRAP |
1883 | && !(target_stopped_by_watchpoint () | |
1884 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
1885 | || target_have_steppable_watchpoint))) | |
237fc4c9 PA |
1886 | { |
1887 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
1888 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
1889 | displaced->step_closure, | |
1890 | displaced->step_original, | |
1891 | displaced->step_copy, | |
00431a78 | 1892 | get_thread_regcache (displaced->step_thread)); |
372316f1 | 1893 | ret = 1; |
237fc4c9 PA |
1894 | } |
1895 | else | |
1896 | { | |
1897 | /* Since the instruction didn't complete, all we can do is | |
1898 | relocate the PC. */ | |
00431a78 | 1899 | struct regcache *regcache = get_thread_regcache (event_thread); |
515630c5 | 1900 | CORE_ADDR pc = regcache_read_pc (regcache); |
abbb1732 | 1901 | |
fc1cf338 | 1902 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1903 | regcache_write_pc (regcache, pc); |
372316f1 | 1904 | ret = -1; |
237fc4c9 PA |
1905 | } |
1906 | ||
372316f1 | 1907 | return ret; |
c2829269 | 1908 | } |
1c5cfe86 | 1909 | |
4d9d9d04 PA |
1910 | /* Data to be passed around while handling an event. This data is |
1911 | discarded between events. */ | |
1912 | struct execution_control_state | |
1913 | { | |
5b6d1e4f | 1914 | process_stratum_target *target; |
4d9d9d04 PA |
1915 | ptid_t ptid; |
1916 | /* The thread that got the event, if this was a thread event; NULL | |
1917 | otherwise. */ | |
1918 | struct thread_info *event_thread; | |
1919 | ||
1920 | struct target_waitstatus ws; | |
1921 | int stop_func_filled_in; | |
1922 | CORE_ADDR stop_func_start; | |
1923 | CORE_ADDR stop_func_end; | |
1924 | const char *stop_func_name; | |
1925 | int wait_some_more; | |
1926 | ||
1927 | /* True if the event thread hit the single-step breakpoint of | |
1928 | another thread. Thus the event doesn't cause a stop, the thread | |
1929 | needs to be single-stepped past the single-step breakpoint before | |
1930 | we can switch back to the original stepping thread. */ | |
1931 | int hit_singlestep_breakpoint; | |
1932 | }; | |
1933 | ||
1934 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1935 | |
1936 | static void | |
4d9d9d04 PA |
1937 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1938 | { | |
1939 | memset (ecs, 0, sizeof (*ecs)); | |
1940 | ecs->event_thread = tp; | |
1941 | ecs->ptid = tp->ptid; | |
1942 | } | |
1943 | ||
1944 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1945 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 1946 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1947 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1948 | |
1949 | /* Are there any pending step-over requests? If so, run all we can | |
1950 | now and return true. Otherwise, return false. */ | |
1951 | ||
1952 | static int | |
c2829269 PA |
1953 | start_step_over (void) |
1954 | { | |
1955 | struct thread_info *tp, *next; | |
1956 | ||
372316f1 PA |
1957 | /* Don't start a new step-over if we already have an in-line |
1958 | step-over operation ongoing. */ | |
1959 | if (step_over_info_valid_p ()) | |
1960 | return 0; | |
1961 | ||
c2829269 | 1962 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 1963 | { |
4d9d9d04 PA |
1964 | struct execution_control_state ecss; |
1965 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1966 | step_over_what step_what; |
372316f1 | 1967 | int must_be_in_line; |
c2829269 | 1968 | |
c65d6b55 PA |
1969 | gdb_assert (!tp->stop_requested); |
1970 | ||
c2829269 | 1971 | next = thread_step_over_chain_next (tp); |
237fc4c9 | 1972 | |
c2829269 PA |
1973 | /* If this inferior already has a displaced step in process, |
1974 | don't start a new one. */ | |
00431a78 | 1975 | if (displaced_step_in_progress (tp->inf)) |
c2829269 PA |
1976 | continue; |
1977 | ||
372316f1 PA |
1978 | step_what = thread_still_needs_step_over (tp); |
1979 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
1980 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 1981 | && !use_displaced_stepping (tp))); |
372316f1 PA |
1982 | |
1983 | /* We currently stop all threads of all processes to step-over | |
1984 | in-line. If we need to start a new in-line step-over, let | |
1985 | any pending displaced steps finish first. */ | |
1986 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
1987 | return 0; | |
1988 | ||
c2829269 PA |
1989 | thread_step_over_chain_remove (tp); |
1990 | ||
1991 | if (step_over_queue_head == NULL) | |
1992 | { | |
1993 | if (debug_infrun) | |
1994 | fprintf_unfiltered (gdb_stdlog, | |
1995 | "infrun: step-over queue now empty\n"); | |
1996 | } | |
1997 | ||
372316f1 PA |
1998 | if (tp->control.trap_expected |
1999 | || tp->resumed | |
2000 | || tp->executing) | |
ad53cd71 | 2001 | { |
4d9d9d04 PA |
2002 | internal_error (__FILE__, __LINE__, |
2003 | "[%s] has inconsistent state: " | |
372316f1 | 2004 | "trap_expected=%d, resumed=%d, executing=%d\n", |
a068643d | 2005 | target_pid_to_str (tp->ptid).c_str (), |
4d9d9d04 | 2006 | tp->control.trap_expected, |
372316f1 | 2007 | tp->resumed, |
4d9d9d04 | 2008 | tp->executing); |
ad53cd71 | 2009 | } |
1c5cfe86 | 2010 | |
4d9d9d04 PA |
2011 | if (debug_infrun) |
2012 | fprintf_unfiltered (gdb_stdlog, | |
2013 | "infrun: resuming [%s] for step-over\n", | |
a068643d | 2014 | target_pid_to_str (tp->ptid).c_str ()); |
4d9d9d04 PA |
2015 | |
2016 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2017 | is no longer inserted. In all-stop, we want to keep looking | |
2018 | for a thread that needs a step-over instead of resuming TP, | |
2019 | because we wouldn't be able to resume anything else until the | |
2020 | target stops again. In non-stop, the resume always resumes | |
2021 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2022 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2023 | continue; |
8550d3b3 | 2024 | |
00431a78 | 2025 | switch_to_thread (tp); |
4d9d9d04 PA |
2026 | reset_ecs (ecs, tp); |
2027 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2028 | |
4d9d9d04 PA |
2029 | if (!ecs->wait_some_more) |
2030 | error (_("Command aborted.")); | |
1c5cfe86 | 2031 | |
372316f1 PA |
2032 | gdb_assert (tp->resumed); |
2033 | ||
2034 | /* If we started a new in-line step-over, we're done. */ | |
2035 | if (step_over_info_valid_p ()) | |
2036 | { | |
2037 | gdb_assert (tp->control.trap_expected); | |
2038 | return 1; | |
2039 | } | |
2040 | ||
fbea99ea | 2041 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2042 | { |
2043 | /* On all-stop, shouldn't have resumed unless we needed a | |
2044 | step over. */ | |
2045 | gdb_assert (tp->control.trap_expected | |
2046 | || tp->step_after_step_resume_breakpoint); | |
2047 | ||
2048 | /* With remote targets (at least), in all-stop, we can't | |
2049 | issue any further remote commands until the program stops | |
2050 | again. */ | |
2051 | return 1; | |
1c5cfe86 | 2052 | } |
c2829269 | 2053 | |
4d9d9d04 PA |
2054 | /* Either the thread no longer needed a step-over, or a new |
2055 | displaced stepping sequence started. Even in the latter | |
2056 | case, continue looking. Maybe we can also start another | |
2057 | displaced step on a thread of other process. */ | |
237fc4c9 | 2058 | } |
4d9d9d04 PA |
2059 | |
2060 | return 0; | |
237fc4c9 PA |
2061 | } |
2062 | ||
5231c1fd PA |
2063 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2064 | holding OLD_PTID. */ | |
2065 | static void | |
2066 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2067 | { | |
d7e15655 | 2068 | if (inferior_ptid == old_ptid) |
5231c1fd | 2069 | inferior_ptid = new_ptid; |
5231c1fd PA |
2070 | } |
2071 | ||
237fc4c9 | 2072 | \f |
c906108c | 2073 | |
53904c9e AC |
2074 | static const char schedlock_off[] = "off"; |
2075 | static const char schedlock_on[] = "on"; | |
2076 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2077 | static const char schedlock_replay[] = "replay"; |
40478521 | 2078 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2079 | schedlock_off, |
2080 | schedlock_on, | |
2081 | schedlock_step, | |
f2665db5 | 2082 | schedlock_replay, |
ef346e04 AC |
2083 | NULL |
2084 | }; | |
f2665db5 | 2085 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2086 | static void |
2087 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2088 | struct cmd_list_element *c, const char *value) | |
2089 | { | |
3e43a32a MS |
2090 | fprintf_filtered (file, |
2091 | _("Mode for locking scheduler " | |
2092 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2093 | value); |
2094 | } | |
c906108c SS |
2095 | |
2096 | static void | |
eb4c3f4a | 2097 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2098 | { |
eefe576e AC |
2099 | if (!target_can_lock_scheduler) |
2100 | { | |
2101 | scheduler_mode = schedlock_off; | |
2102 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2103 | } | |
c906108c SS |
2104 | } |
2105 | ||
d4db2f36 PA |
2106 | /* True if execution commands resume all threads of all processes by |
2107 | default; otherwise, resume only threads of the current inferior | |
2108 | process. */ | |
491144b5 | 2109 | bool sched_multi = false; |
d4db2f36 | 2110 | |
2facfe5c DD |
2111 | /* Try to setup for software single stepping over the specified location. |
2112 | Return 1 if target_resume() should use hardware single step. | |
2113 | ||
2114 | GDBARCH the current gdbarch. | |
2115 | PC the location to step over. */ | |
2116 | ||
2117 | static int | |
2118 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2119 | { | |
2120 | int hw_step = 1; | |
2121 | ||
f02253f1 | 2122 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2123 | && gdbarch_software_single_step_p (gdbarch)) |
2124 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2125 | ||
2facfe5c DD |
2126 | return hw_step; |
2127 | } | |
c906108c | 2128 | |
f3263aa4 PA |
2129 | /* See infrun.h. */ |
2130 | ||
09cee04b PA |
2131 | ptid_t |
2132 | user_visible_resume_ptid (int step) | |
2133 | { | |
f3263aa4 | 2134 | ptid_t resume_ptid; |
09cee04b | 2135 | |
09cee04b PA |
2136 | if (non_stop) |
2137 | { | |
2138 | /* With non-stop mode on, threads are always handled | |
2139 | individually. */ | |
2140 | resume_ptid = inferior_ptid; | |
2141 | } | |
2142 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2143 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2144 | { |
f3263aa4 PA |
2145 | /* User-settable 'scheduler' mode requires solo thread |
2146 | resume. */ | |
09cee04b PA |
2147 | resume_ptid = inferior_ptid; |
2148 | } | |
f2665db5 MM |
2149 | else if ((scheduler_mode == schedlock_replay) |
2150 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2151 | { | |
2152 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2153 | mode. */ | |
2154 | resume_ptid = inferior_ptid; | |
2155 | } | |
f3263aa4 PA |
2156 | else if (!sched_multi && target_supports_multi_process ()) |
2157 | { | |
2158 | /* Resume all threads of the current process (and none of other | |
2159 | processes). */ | |
e99b03dc | 2160 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2161 | } |
2162 | else | |
2163 | { | |
2164 | /* Resume all threads of all processes. */ | |
2165 | resume_ptid = RESUME_ALL; | |
2166 | } | |
09cee04b PA |
2167 | |
2168 | return resume_ptid; | |
2169 | } | |
2170 | ||
5b6d1e4f PA |
2171 | /* See infrun.h. */ |
2172 | ||
2173 | process_stratum_target * | |
2174 | user_visible_resume_target (ptid_t resume_ptid) | |
2175 | { | |
2176 | return (resume_ptid == minus_one_ptid && sched_multi | |
2177 | ? NULL | |
2178 | : current_inferior ()->process_target ()); | |
2179 | } | |
2180 | ||
fbea99ea PA |
2181 | /* Return a ptid representing the set of threads that we will resume, |
2182 | in the perspective of the target, assuming run control handling | |
2183 | does not require leaving some threads stopped (e.g., stepping past | |
2184 | breakpoint). USER_STEP indicates whether we're about to start the | |
2185 | target for a stepping command. */ | |
2186 | ||
2187 | static ptid_t | |
2188 | internal_resume_ptid (int user_step) | |
2189 | { | |
2190 | /* In non-stop, we always control threads individually. Note that | |
2191 | the target may always work in non-stop mode even with "set | |
2192 | non-stop off", in which case user_visible_resume_ptid could | |
2193 | return a wildcard ptid. */ | |
2194 | if (target_is_non_stop_p ()) | |
2195 | return inferior_ptid; | |
2196 | else | |
2197 | return user_visible_resume_ptid (user_step); | |
2198 | } | |
2199 | ||
64ce06e4 PA |
2200 | /* Wrapper for target_resume, that handles infrun-specific |
2201 | bookkeeping. */ | |
2202 | ||
2203 | static void | |
2204 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2205 | { | |
2206 | struct thread_info *tp = inferior_thread (); | |
2207 | ||
c65d6b55 PA |
2208 | gdb_assert (!tp->stop_requested); |
2209 | ||
64ce06e4 | 2210 | /* Install inferior's terminal modes. */ |
223ffa71 | 2211 | target_terminal::inferior (); |
64ce06e4 PA |
2212 | |
2213 | /* Avoid confusing the next resume, if the next stop/resume | |
2214 | happens to apply to another thread. */ | |
2215 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2216 | ||
8f572e5c PA |
2217 | /* Advise target which signals may be handled silently. |
2218 | ||
2219 | If we have removed breakpoints because we are stepping over one | |
2220 | in-line (in any thread), we need to receive all signals to avoid | |
2221 | accidentally skipping a breakpoint during execution of a signal | |
2222 | handler. | |
2223 | ||
2224 | Likewise if we're displaced stepping, otherwise a trap for a | |
2225 | breakpoint in a signal handler might be confused with the | |
2226 | displaced step finishing. We don't make the displaced_step_fixup | |
2227 | step distinguish the cases instead, because: | |
2228 | ||
2229 | - a backtrace while stopped in the signal handler would show the | |
2230 | scratch pad as frame older than the signal handler, instead of | |
2231 | the real mainline code. | |
2232 | ||
2233 | - when the thread is later resumed, the signal handler would | |
2234 | return to the scratch pad area, which would no longer be | |
2235 | valid. */ | |
2236 | if (step_over_info_valid_p () | |
00431a78 | 2237 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2238 | target_pass_signals ({}); |
64ce06e4 | 2239 | else |
adc6a863 | 2240 | target_pass_signals (signal_pass); |
64ce06e4 PA |
2241 | |
2242 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2243 | |
2244 | target_commit_resume (); | |
5b6d1e4f PA |
2245 | |
2246 | if (target_can_async_p ()) | |
2247 | target_async (1); | |
64ce06e4 PA |
2248 | } |
2249 | ||
d930703d | 2250 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2251 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2252 | call 'resume', which handles exceptions. */ | |
c906108c | 2253 | |
71d378ae PA |
2254 | static void |
2255 | resume_1 (enum gdb_signal sig) | |
c906108c | 2256 | { |
515630c5 | 2257 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2258 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2259 | struct thread_info *tp = inferior_thread (); |
515630c5 | 2260 | CORE_ADDR pc = regcache_read_pc (regcache); |
8b86c959 | 2261 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2262 | ptid_t resume_ptid; |
856e7dd6 PA |
2263 | /* This represents the user's step vs continue request. When |
2264 | deciding whether "set scheduler-locking step" applies, it's the | |
2265 | user's intention that counts. */ | |
2266 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2267 | /* This represents what we'll actually request the target to do. |
2268 | This can decay from a step to a continue, if e.g., we need to | |
2269 | implement single-stepping with breakpoints (software | |
2270 | single-step). */ | |
6b403daa | 2271 | int step; |
c7e8a53c | 2272 | |
c65d6b55 | 2273 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2274 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2275 | ||
372316f1 PA |
2276 | if (tp->suspend.waitstatus_pending_p) |
2277 | { | |
2278 | if (debug_infrun) | |
2279 | { | |
23fdd69e SM |
2280 | std::string statstr |
2281 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2282 | |
372316f1 | 2283 | fprintf_unfiltered (gdb_stdlog, |
23fdd69e SM |
2284 | "infrun: resume: thread %s has pending wait " |
2285 | "status %s (currently_stepping=%d).\n", | |
a068643d TT |
2286 | target_pid_to_str (tp->ptid).c_str (), |
2287 | statstr.c_str (), | |
372316f1 | 2288 | currently_stepping (tp)); |
372316f1 PA |
2289 | } |
2290 | ||
5b6d1e4f | 2291 | tp->inf->process_target ()->threads_executing = true; |
372316f1 PA |
2292 | tp->resumed = 1; |
2293 | ||
2294 | /* FIXME: What should we do if we are supposed to resume this | |
2295 | thread with a signal? Maybe we should maintain a queue of | |
2296 | pending signals to deliver. */ | |
2297 | if (sig != GDB_SIGNAL_0) | |
2298 | { | |
fd7dcb94 | 2299 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d TT |
2300 | gdb_signal_to_name (sig), |
2301 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2302 | } |
2303 | ||
2304 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2305 | |
2306 | if (target_can_async_p ()) | |
9516f85a AB |
2307 | { |
2308 | target_async (1); | |
2309 | /* Tell the event loop we have an event to process. */ | |
2310 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2311 | } | |
372316f1 PA |
2312 | return; |
2313 | } | |
2314 | ||
2315 | tp->stepped_breakpoint = 0; | |
2316 | ||
6b403daa PA |
2317 | /* Depends on stepped_breakpoint. */ |
2318 | step = currently_stepping (tp); | |
2319 | ||
74609e71 YQ |
2320 | if (current_inferior ()->waiting_for_vfork_done) |
2321 | { | |
48f9886d PA |
2322 | /* Don't try to single-step a vfork parent that is waiting for |
2323 | the child to get out of the shared memory region (by exec'ing | |
2324 | or exiting). This is particularly important on software | |
2325 | single-step archs, as the child process would trip on the | |
2326 | software single step breakpoint inserted for the parent | |
2327 | process. Since the parent will not actually execute any | |
2328 | instruction until the child is out of the shared region (such | |
2329 | are vfork's semantics), it is safe to simply continue it. | |
2330 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2331 | the parent, and tell it to `keep_going', which automatically | |
2332 | re-sets it stepping. */ | |
74609e71 YQ |
2333 | if (debug_infrun) |
2334 | fprintf_unfiltered (gdb_stdlog, | |
2335 | "infrun: resume : clear step\n"); | |
a09dd441 | 2336 | step = 0; |
74609e71 YQ |
2337 | } |
2338 | ||
527159b7 | 2339 | if (debug_infrun) |
237fc4c9 | 2340 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 2341 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 2342 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
2343 | step, gdb_signal_to_symbol_string (sig), |
2344 | tp->control.trap_expected, | |
a068643d | 2345 | target_pid_to_str (inferior_ptid).c_str (), |
0d9a9a5f | 2346 | paddress (gdbarch, pc)); |
c906108c | 2347 | |
c2c6d25f JM |
2348 | /* Normally, by the time we reach `resume', the breakpoints are either |
2349 | removed or inserted, as appropriate. The exception is if we're sitting | |
2350 | at a permanent breakpoint; we need to step over it, but permanent | |
2351 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2352 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2353 | { |
af48d08f PA |
2354 | if (sig != GDB_SIGNAL_0) |
2355 | { | |
2356 | /* We have a signal to pass to the inferior. The resume | |
2357 | may, or may not take us to the signal handler. If this | |
2358 | is a step, we'll need to stop in the signal handler, if | |
2359 | there's one, (if the target supports stepping into | |
2360 | handlers), or in the next mainline instruction, if | |
2361 | there's no handler. If this is a continue, we need to be | |
2362 | sure to run the handler with all breakpoints inserted. | |
2363 | In all cases, set a breakpoint at the current address | |
2364 | (where the handler returns to), and once that breakpoint | |
2365 | is hit, resume skipping the permanent breakpoint. If | |
2366 | that breakpoint isn't hit, then we've stepped into the | |
2367 | signal handler (or hit some other event). We'll delete | |
2368 | the step-resume breakpoint then. */ | |
2369 | ||
2370 | if (debug_infrun) | |
2371 | fprintf_unfiltered (gdb_stdlog, | |
2372 | "infrun: resume: skipping permanent breakpoint, " | |
2373 | "deliver signal first\n"); | |
2374 | ||
2375 | clear_step_over_info (); | |
2376 | tp->control.trap_expected = 0; | |
2377 | ||
2378 | if (tp->control.step_resume_breakpoint == NULL) | |
2379 | { | |
2380 | /* Set a "high-priority" step-resume, as we don't want | |
2381 | user breakpoints at PC to trigger (again) when this | |
2382 | hits. */ | |
2383 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2384 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2385 | ||
2386 | tp->step_after_step_resume_breakpoint = step; | |
2387 | } | |
2388 | ||
2389 | insert_breakpoints (); | |
2390 | } | |
2391 | else | |
2392 | { | |
2393 | /* There's no signal to pass, we can go ahead and skip the | |
2394 | permanent breakpoint manually. */ | |
2395 | if (debug_infrun) | |
2396 | fprintf_unfiltered (gdb_stdlog, | |
2397 | "infrun: resume: skipping permanent breakpoint\n"); | |
2398 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
2399 | /* Update pc to reflect the new address from which we will | |
2400 | execute instructions. */ | |
2401 | pc = regcache_read_pc (regcache); | |
2402 | ||
2403 | if (step) | |
2404 | { | |
2405 | /* We've already advanced the PC, so the stepping part | |
2406 | is done. Now we need to arrange for a trap to be | |
2407 | reported to handle_inferior_event. Set a breakpoint | |
2408 | at the current PC, and run to it. Don't update | |
2409 | prev_pc, because if we end in | |
44a1ee51 PA |
2410 | switch_back_to_stepped_thread, we want the "expected |
2411 | thread advanced also" branch to be taken. IOW, we | |
2412 | don't want this thread to step further from PC | |
af48d08f | 2413 | (overstep). */ |
1ac806b8 | 2414 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2415 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2416 | insert_breakpoints (); | |
2417 | ||
fbea99ea | 2418 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2419 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
372316f1 | 2420 | tp->resumed = 1; |
af48d08f PA |
2421 | return; |
2422 | } | |
2423 | } | |
6d350bb5 | 2424 | } |
c2c6d25f | 2425 | |
c1e36e3e PA |
2426 | /* If we have a breakpoint to step over, make sure to do a single |
2427 | step only. Same if we have software watchpoints. */ | |
2428 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2429 | tp->control.may_range_step = 0; | |
2430 | ||
237fc4c9 PA |
2431 | /* If enabled, step over breakpoints by executing a copy of the |
2432 | instruction at a different address. | |
2433 | ||
2434 | We can't use displaced stepping when we have a signal to deliver; | |
2435 | the comments for displaced_step_prepare explain why. The | |
2436 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2437 | signals' explain what we do instead. |
2438 | ||
2439 | We can't use displaced stepping when we are waiting for vfork_done | |
2440 | event, displaced stepping breaks the vfork child similarly as single | |
2441 | step software breakpoint. */ | |
3fc8eb30 PA |
2442 | if (tp->control.trap_expected |
2443 | && use_displaced_stepping (tp) | |
cb71640d | 2444 | && !step_over_info_valid_p () |
a493e3e2 | 2445 | && sig == GDB_SIGNAL_0 |
74609e71 | 2446 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2447 | { |
00431a78 | 2448 | int prepared = displaced_step_prepare (tp); |
fc1cf338 | 2449 | |
3fc8eb30 | 2450 | if (prepared == 0) |
d56b7306 | 2451 | { |
4d9d9d04 PA |
2452 | if (debug_infrun) |
2453 | fprintf_unfiltered (gdb_stdlog, | |
2454 | "Got placed in step-over queue\n"); | |
2455 | ||
2456 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2457 | return; |
2458 | } | |
3fc8eb30 PA |
2459 | else if (prepared < 0) |
2460 | { | |
2461 | /* Fallback to stepping over the breakpoint in-line. */ | |
2462 | ||
2463 | if (target_is_non_stop_p ()) | |
2464 | stop_all_threads (); | |
2465 | ||
a01bda52 | 2466 | set_step_over_info (regcache->aspace (), |
21edc42f | 2467 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2468 | |
2469 | step = maybe_software_singlestep (gdbarch, pc); | |
2470 | ||
2471 | insert_breakpoints (); | |
2472 | } | |
2473 | else if (prepared > 0) | |
2474 | { | |
2475 | struct displaced_step_inferior_state *displaced; | |
99e40580 | 2476 | |
3fc8eb30 PA |
2477 | /* Update pc to reflect the new address from which we will |
2478 | execute instructions due to displaced stepping. */ | |
00431a78 | 2479 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2480 | |
00431a78 | 2481 | displaced = get_displaced_stepping_state (tp->inf); |
3fc8eb30 PA |
2482 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, |
2483 | displaced->step_closure); | |
2484 | } | |
237fc4c9 PA |
2485 | } |
2486 | ||
2facfe5c | 2487 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2488 | else if (step) |
2facfe5c | 2489 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2490 | |
30852783 UW |
2491 | /* Currently, our software single-step implementation leads to different |
2492 | results than hardware single-stepping in one situation: when stepping | |
2493 | into delivering a signal which has an associated signal handler, | |
2494 | hardware single-step will stop at the first instruction of the handler, | |
2495 | while software single-step will simply skip execution of the handler. | |
2496 | ||
2497 | For now, this difference in behavior is accepted since there is no | |
2498 | easy way to actually implement single-stepping into a signal handler | |
2499 | without kernel support. | |
2500 | ||
2501 | However, there is one scenario where this difference leads to follow-on | |
2502 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2503 | and then single-stepping. In this case, the software single-step | |
2504 | behavior means that even if there is a *breakpoint* in the signal | |
2505 | handler, GDB still would not stop. | |
2506 | ||
2507 | Fortunately, we can at least fix this particular issue. We detect | |
2508 | here the case where we are about to deliver a signal while software | |
2509 | single-stepping with breakpoints removed. In this situation, we | |
2510 | revert the decisions to remove all breakpoints and insert single- | |
2511 | step breakpoints, and instead we install a step-resume breakpoint | |
2512 | at the current address, deliver the signal without stepping, and | |
2513 | once we arrive back at the step-resume breakpoint, actually step | |
2514 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2515 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2516 | && sig != GDB_SIGNAL_0 |
2517 | && step_over_info_valid_p ()) | |
30852783 UW |
2518 | { |
2519 | /* If we have nested signals or a pending signal is delivered | |
2520 | immediately after a handler returns, might might already have | |
2521 | a step-resume breakpoint set on the earlier handler. We cannot | |
2522 | set another step-resume breakpoint; just continue on until the | |
2523 | original breakpoint is hit. */ | |
2524 | if (tp->control.step_resume_breakpoint == NULL) | |
2525 | { | |
2c03e5be | 2526 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2527 | tp->step_after_step_resume_breakpoint = 1; |
2528 | } | |
2529 | ||
34b7e8a6 | 2530 | delete_single_step_breakpoints (tp); |
30852783 | 2531 | |
31e77af2 | 2532 | clear_step_over_info (); |
30852783 | 2533 | tp->control.trap_expected = 0; |
31e77af2 PA |
2534 | |
2535 | insert_breakpoints (); | |
30852783 UW |
2536 | } |
2537 | ||
b0f16a3e SM |
2538 | /* If STEP is set, it's a request to use hardware stepping |
2539 | facilities. But in that case, we should never | |
2540 | use singlestep breakpoint. */ | |
34b7e8a6 | 2541 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2542 | |
fbea99ea | 2543 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2544 | if (tp->control.trap_expected) |
b0f16a3e SM |
2545 | { |
2546 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2547 | hit, either by single-stepping the thread with the breakpoint |
2548 | removed, or by displaced stepping, with the breakpoint inserted. | |
2549 | In the former case, we need to single-step only this thread, | |
2550 | and keep others stopped, as they can miss this breakpoint if | |
2551 | allowed to run. That's not really a problem for displaced | |
2552 | stepping, but, we still keep other threads stopped, in case | |
2553 | another thread is also stopped for a breakpoint waiting for | |
2554 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2555 | resume_ptid = inferior_ptid; |
2556 | } | |
fbea99ea PA |
2557 | else |
2558 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2559 | |
7f5ef605 PA |
2560 | if (execution_direction != EXEC_REVERSE |
2561 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2562 | { |
372316f1 PA |
2563 | /* There are two cases where we currently need to step a |
2564 | breakpoint instruction when we have a signal to deliver: | |
2565 | ||
2566 | - See handle_signal_stop where we handle random signals that | |
2567 | could take out us out of the stepping range. Normally, in | |
2568 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2569 | signal handler with a breakpoint at PC, but there are cases |
2570 | where we should _always_ single-step, even if we have a | |
2571 | step-resume breakpoint, like when a software watchpoint is | |
2572 | set. Assuming single-stepping and delivering a signal at the | |
2573 | same time would takes us to the signal handler, then we could | |
2574 | have removed the breakpoint at PC to step over it. However, | |
2575 | some hardware step targets (like e.g., Mac OS) can't step | |
2576 | into signal handlers, and for those, we need to leave the | |
2577 | breakpoint at PC inserted, as otherwise if the handler | |
2578 | recurses and executes PC again, it'll miss the breakpoint. | |
2579 | So we leave the breakpoint inserted anyway, but we need to | |
2580 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2581 | that adjust_pc_after_break doesn't end up confused. |
2582 | ||
2583 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2584 | in one thread after another thread that was stepping had been | |
2585 | momentarily paused for a step-over. When we re-resume the | |
2586 | stepping thread, it may be resumed from that address with a | |
2587 | breakpoint that hasn't trapped yet. Seen with | |
2588 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2589 | do displaced stepping. */ | |
2590 | ||
2591 | if (debug_infrun) | |
2592 | fprintf_unfiltered (gdb_stdlog, | |
2593 | "infrun: resume: [%s] stepped breakpoint\n", | |
a068643d | 2594 | target_pid_to_str (tp->ptid).c_str ()); |
7f5ef605 PA |
2595 | |
2596 | tp->stepped_breakpoint = 1; | |
2597 | ||
b0f16a3e SM |
2598 | /* Most targets can step a breakpoint instruction, thus |
2599 | executing it normally. But if this one cannot, just | |
2600 | continue and we will hit it anyway. */ | |
7f5ef605 | 2601 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2602 | step = 0; |
2603 | } | |
ef5cf84e | 2604 | |
b0f16a3e | 2605 | if (debug_displaced |
cb71640d | 2606 | && tp->control.trap_expected |
3fc8eb30 | 2607 | && use_displaced_stepping (tp) |
cb71640d | 2608 | && !step_over_info_valid_p ()) |
b0f16a3e | 2609 | { |
00431a78 | 2610 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2611 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2612 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2613 | gdb_byte buf[4]; | |
2614 | ||
2615 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2616 | paddress (resume_gdbarch, actual_pc)); | |
2617 | read_memory (actual_pc, buf, sizeof (buf)); | |
2618 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2619 | } | |
237fc4c9 | 2620 | |
b0f16a3e SM |
2621 | if (tp->control.may_range_step) |
2622 | { | |
2623 | /* If we're resuming a thread with the PC out of the step | |
2624 | range, then we're doing some nested/finer run control | |
2625 | operation, like stepping the thread out of the dynamic | |
2626 | linker or the displaced stepping scratch pad. We | |
2627 | shouldn't have allowed a range step then. */ | |
2628 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2629 | } | |
c1e36e3e | 2630 | |
64ce06e4 | 2631 | do_target_resume (resume_ptid, step, sig); |
372316f1 | 2632 | tp->resumed = 1; |
c906108c | 2633 | } |
71d378ae PA |
2634 | |
2635 | /* Resume the inferior. SIG is the signal to give the inferior | |
2636 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2637 | rolls back state on error. */ | |
2638 | ||
aff4e175 | 2639 | static void |
71d378ae PA |
2640 | resume (gdb_signal sig) |
2641 | { | |
a70b8144 | 2642 | try |
71d378ae PA |
2643 | { |
2644 | resume_1 (sig); | |
2645 | } | |
230d2906 | 2646 | catch (const gdb_exception &ex) |
71d378ae PA |
2647 | { |
2648 | /* If resuming is being aborted for any reason, delete any | |
2649 | single-step breakpoint resume_1 may have created, to avoid | |
2650 | confusing the following resumption, and to avoid leaving | |
2651 | single-step breakpoints perturbing other threads, in case | |
2652 | we're running in non-stop mode. */ | |
2653 | if (inferior_ptid != null_ptid) | |
2654 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2655 | throw; |
71d378ae | 2656 | } |
71d378ae PA |
2657 | } |
2658 | ||
c906108c | 2659 | \f |
237fc4c9 | 2660 | /* Proceeding. */ |
c906108c | 2661 | |
4c2f2a79 PA |
2662 | /* See infrun.h. */ |
2663 | ||
2664 | /* Counter that tracks number of user visible stops. This can be used | |
2665 | to tell whether a command has proceeded the inferior past the | |
2666 | current location. This allows e.g., inferior function calls in | |
2667 | breakpoint commands to not interrupt the command list. When the | |
2668 | call finishes successfully, the inferior is standing at the same | |
2669 | breakpoint as if nothing happened (and so we don't call | |
2670 | normal_stop). */ | |
2671 | static ULONGEST current_stop_id; | |
2672 | ||
2673 | /* See infrun.h. */ | |
2674 | ||
2675 | ULONGEST | |
2676 | get_stop_id (void) | |
2677 | { | |
2678 | return current_stop_id; | |
2679 | } | |
2680 | ||
2681 | /* Called when we report a user visible stop. */ | |
2682 | ||
2683 | static void | |
2684 | new_stop_id (void) | |
2685 | { | |
2686 | current_stop_id++; | |
2687 | } | |
2688 | ||
c906108c SS |
2689 | /* Clear out all variables saying what to do when inferior is continued. |
2690 | First do this, then set the ones you want, then call `proceed'. */ | |
2691 | ||
a7212384 UW |
2692 | static void |
2693 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2694 | { |
a7212384 UW |
2695 | if (debug_infrun) |
2696 | fprintf_unfiltered (gdb_stdlog, | |
2697 | "infrun: clear_proceed_status_thread (%s)\n", | |
a068643d | 2698 | target_pid_to_str (tp->ptid).c_str ()); |
d6b48e9c | 2699 | |
372316f1 PA |
2700 | /* If we're starting a new sequence, then the previous finished |
2701 | single-step is no longer relevant. */ | |
2702 | if (tp->suspend.waitstatus_pending_p) | |
2703 | { | |
2704 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2705 | { | |
2706 | if (debug_infrun) | |
2707 | fprintf_unfiltered (gdb_stdlog, | |
2708 | "infrun: clear_proceed_status: pending " | |
2709 | "event of %s was a finished step. " | |
2710 | "Discarding.\n", | |
a068643d | 2711 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
2712 | |
2713 | tp->suspend.waitstatus_pending_p = 0; | |
2714 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2715 | } | |
2716 | else if (debug_infrun) | |
2717 | { | |
23fdd69e SM |
2718 | std::string statstr |
2719 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2720 | |
372316f1 PA |
2721 | fprintf_unfiltered (gdb_stdlog, |
2722 | "infrun: clear_proceed_status_thread: thread %s " | |
2723 | "has pending wait status %s " | |
2724 | "(currently_stepping=%d).\n", | |
a068643d TT |
2725 | target_pid_to_str (tp->ptid).c_str (), |
2726 | statstr.c_str (), | |
372316f1 | 2727 | currently_stepping (tp)); |
372316f1 PA |
2728 | } |
2729 | } | |
2730 | ||
70509625 PA |
2731 | /* If this signal should not be seen by program, give it zero. |
2732 | Used for debugging signals. */ | |
2733 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2734 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2735 | ||
46e3ed7f | 2736 | delete tp->thread_fsm; |
243a9253 PA |
2737 | tp->thread_fsm = NULL; |
2738 | ||
16c381f0 JK |
2739 | tp->control.trap_expected = 0; |
2740 | tp->control.step_range_start = 0; | |
2741 | tp->control.step_range_end = 0; | |
c1e36e3e | 2742 | tp->control.may_range_step = 0; |
16c381f0 JK |
2743 | tp->control.step_frame_id = null_frame_id; |
2744 | tp->control.step_stack_frame_id = null_frame_id; | |
2745 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2746 | tp->control.step_start_function = NULL; |
a7212384 | 2747 | tp->stop_requested = 0; |
4e1c45ea | 2748 | |
16c381f0 | 2749 | tp->control.stop_step = 0; |
32400beb | 2750 | |
16c381f0 | 2751 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2752 | |
856e7dd6 | 2753 | tp->control.stepping_command = 0; |
17b2616c | 2754 | |
a7212384 | 2755 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2756 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2757 | } |
32400beb | 2758 | |
a7212384 | 2759 | void |
70509625 | 2760 | clear_proceed_status (int step) |
a7212384 | 2761 | { |
f2665db5 MM |
2762 | /* With scheduler-locking replay, stop replaying other threads if we're |
2763 | not replaying the user-visible resume ptid. | |
2764 | ||
2765 | This is a convenience feature to not require the user to explicitly | |
2766 | stop replaying the other threads. We're assuming that the user's | |
2767 | intent is to resume tracing the recorded process. */ | |
2768 | if (!non_stop && scheduler_mode == schedlock_replay | |
2769 | && target_record_is_replaying (minus_one_ptid) | |
2770 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2771 | execution_direction)) | |
2772 | target_record_stop_replaying (); | |
2773 | ||
08036331 | 2774 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2775 | { |
08036331 | 2776 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2777 | process_stratum_target *resume_target |
2778 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2779 | |
2780 | /* In all-stop mode, delete the per-thread status of all threads | |
2781 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2782 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2783 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2784 | } |
2785 | ||
d7e15655 | 2786 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2787 | { |
2788 | struct inferior *inferior; | |
2789 | ||
2790 | if (non_stop) | |
2791 | { | |
6c95b8df PA |
2792 | /* If in non-stop mode, only delete the per-thread status of |
2793 | the current thread. */ | |
a7212384 UW |
2794 | clear_proceed_status_thread (inferior_thread ()); |
2795 | } | |
6c95b8df | 2796 | |
d6b48e9c | 2797 | inferior = current_inferior (); |
16c381f0 | 2798 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2799 | } |
2800 | ||
76727919 | 2801 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2802 | } |
2803 | ||
99619bea PA |
2804 | /* Returns true if TP is still stopped at a breakpoint that needs |
2805 | stepping-over in order to make progress. If the breakpoint is gone | |
2806 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2807 | |
2808 | static int | |
6c4cfb24 | 2809 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2810 | { |
2811 | if (tp->stepping_over_breakpoint) | |
2812 | { | |
00431a78 | 2813 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2814 | |
a01bda52 | 2815 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2816 | regcache_read_pc (regcache)) |
2817 | == ordinary_breakpoint_here) | |
99619bea PA |
2818 | return 1; |
2819 | ||
2820 | tp->stepping_over_breakpoint = 0; | |
2821 | } | |
2822 | ||
2823 | return 0; | |
2824 | } | |
2825 | ||
6c4cfb24 PA |
2826 | /* Check whether thread TP still needs to start a step-over in order |
2827 | to make progress when resumed. Returns an bitwise or of enum | |
2828 | step_over_what bits, indicating what needs to be stepped over. */ | |
2829 | ||
8d297bbf | 2830 | static step_over_what |
6c4cfb24 PA |
2831 | thread_still_needs_step_over (struct thread_info *tp) |
2832 | { | |
8d297bbf | 2833 | step_over_what what = 0; |
6c4cfb24 PA |
2834 | |
2835 | if (thread_still_needs_step_over_bp (tp)) | |
2836 | what |= STEP_OVER_BREAKPOINT; | |
2837 | ||
2838 | if (tp->stepping_over_watchpoint | |
2839 | && !target_have_steppable_watchpoint) | |
2840 | what |= STEP_OVER_WATCHPOINT; | |
2841 | ||
2842 | return what; | |
2843 | } | |
2844 | ||
483805cf PA |
2845 | /* Returns true if scheduler locking applies. STEP indicates whether |
2846 | we're about to do a step/next-like command to a thread. */ | |
2847 | ||
2848 | static int | |
856e7dd6 | 2849 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2850 | { |
2851 | return (scheduler_mode == schedlock_on | |
2852 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2853 | && tp->control.stepping_command) |
2854 | || (scheduler_mode == schedlock_replay | |
2855 | && target_record_will_replay (minus_one_ptid, | |
2856 | execution_direction))); | |
483805cf PA |
2857 | } |
2858 | ||
5b6d1e4f PA |
2859 | /* Calls target_commit_resume on all targets. */ |
2860 | ||
2861 | static void | |
2862 | commit_resume_all_targets () | |
2863 | { | |
2864 | scoped_restore_current_thread restore_thread; | |
2865 | ||
2866 | /* Map between process_target and a representative inferior. This | |
2867 | is to avoid committing a resume in the same target more than | |
2868 | once. Resumptions must be idempotent, so this is an | |
2869 | optimization. */ | |
2870 | std::unordered_map<process_stratum_target *, inferior *> conn_inf; | |
2871 | ||
2872 | for (inferior *inf : all_non_exited_inferiors ()) | |
2873 | if (inf->has_execution ()) | |
2874 | conn_inf[inf->process_target ()] = inf; | |
2875 | ||
2876 | for (const auto &ci : conn_inf) | |
2877 | { | |
2878 | inferior *inf = ci.second; | |
2879 | switch_to_inferior_no_thread (inf); | |
2880 | target_commit_resume (); | |
2881 | } | |
2882 | } | |
2883 | ||
c906108c SS |
2884 | /* Basic routine for continuing the program in various fashions. |
2885 | ||
2886 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
2887 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
2888 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
2889 | |
2890 | You should call clear_proceed_status before calling proceed. */ | |
2891 | ||
2892 | void | |
64ce06e4 | 2893 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2894 | { |
e58b0e63 PA |
2895 | struct regcache *regcache; |
2896 | struct gdbarch *gdbarch; | |
e58b0e63 | 2897 | CORE_ADDR pc; |
4d9d9d04 PA |
2898 | struct execution_control_state ecss; |
2899 | struct execution_control_state *ecs = &ecss; | |
4d9d9d04 | 2900 | int started; |
c906108c | 2901 | |
e58b0e63 PA |
2902 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2903 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2904 | resuming the current thread. */ | |
2905 | if (!follow_fork ()) | |
2906 | { | |
2907 | /* The target for some reason decided not to resume. */ | |
2908 | normal_stop (); | |
f148b27e PA |
2909 | if (target_can_async_p ()) |
2910 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2911 | return; |
2912 | } | |
2913 | ||
842951eb PA |
2914 | /* We'll update this if & when we switch to a new thread. */ |
2915 | previous_inferior_ptid = inferior_ptid; | |
2916 | ||
e58b0e63 | 2917 | regcache = get_current_regcache (); |
ac7936df | 2918 | gdbarch = regcache->arch (); |
8b86c959 YQ |
2919 | const address_space *aspace = regcache->aspace (); |
2920 | ||
e58b0e63 | 2921 | pc = regcache_read_pc (regcache); |
08036331 | 2922 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 2923 | |
99619bea | 2924 | /* Fill in with reasonable starting values. */ |
08036331 | 2925 | init_thread_stepping_state (cur_thr); |
99619bea | 2926 | |
08036331 | 2927 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 2928 | |
5b6d1e4f PA |
2929 | ptid_t resume_ptid |
2930 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
2931 | process_stratum_target *resume_target | |
2932 | = user_visible_resume_target (resume_ptid); | |
2933 | ||
2acceee2 | 2934 | if (addr == (CORE_ADDR) -1) |
c906108c | 2935 | { |
08036331 | 2936 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 2937 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 2938 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2939 | /* There is a breakpoint at the address we will resume at, |
2940 | step one instruction before inserting breakpoints so that | |
2941 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2942 | breakpoint). |
2943 | ||
2944 | Note, we don't do this in reverse, because we won't | |
2945 | actually be executing the breakpoint insn anyway. | |
2946 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 2947 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
2948 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2949 | && gdbarch_single_step_through_delay (gdbarch, | |
2950 | get_current_frame ())) | |
3352ef37 AC |
2951 | /* We stepped onto an instruction that needs to be stepped |
2952 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 2953 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
2954 | } |
2955 | else | |
2956 | { | |
515630c5 | 2957 | regcache_write_pc (regcache, addr); |
c906108c SS |
2958 | } |
2959 | ||
70509625 | 2960 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 2961 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 2962 | |
4d9d9d04 PA |
2963 | /* If an exception is thrown from this point on, make sure to |
2964 | propagate GDB's knowledge of the executing state to the | |
2965 | frontend/user running state. */ | |
5b6d1e4f | 2966 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
2967 | |
2968 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
2969 | threads (e.g., we might need to set threads stepping over | |
2970 | breakpoints first), from the user/frontend's point of view, all | |
2971 | threads in RESUME_PTID are now running. Unless we're calling an | |
2972 | inferior function, as in that case we pretend the inferior | |
2973 | doesn't run at all. */ | |
08036331 | 2974 | if (!cur_thr->control.in_infcall) |
5b6d1e4f | 2975 | set_running (resume_target, resume_ptid, 1); |
17b2616c | 2976 | |
527159b7 | 2977 | if (debug_infrun) |
8a9de0e4 | 2978 | fprintf_unfiltered (gdb_stdlog, |
64ce06e4 | 2979 | "infrun: proceed (addr=%s, signal=%s)\n", |
c9737c08 | 2980 | paddress (gdbarch, addr), |
64ce06e4 | 2981 | gdb_signal_to_symbol_string (siggnal)); |
527159b7 | 2982 | |
4d9d9d04 PA |
2983 | annotate_starting (); |
2984 | ||
2985 | /* Make sure that output from GDB appears before output from the | |
2986 | inferior. */ | |
2987 | gdb_flush (gdb_stdout); | |
2988 | ||
d930703d PA |
2989 | /* Since we've marked the inferior running, give it the terminal. A |
2990 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
2991 | still detect attempts to unblock a stuck connection with repeated | |
2992 | Ctrl-C from within target_pass_ctrlc). */ | |
2993 | target_terminal::inferior (); | |
2994 | ||
4d9d9d04 PA |
2995 | /* In a multi-threaded task we may select another thread and |
2996 | then continue or step. | |
2997 | ||
2998 | But if a thread that we're resuming had stopped at a breakpoint, | |
2999 | it will immediately cause another breakpoint stop without any | |
3000 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3001 | we must step over it first. | |
3002 | ||
3003 | Look for threads other than the current (TP) that reported a | |
3004 | breakpoint hit and haven't been resumed yet since. */ | |
3005 | ||
3006 | /* If scheduler locking applies, we can avoid iterating over all | |
3007 | threads. */ | |
08036331 | 3008 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3009 | { |
5b6d1e4f PA |
3010 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3011 | resume_ptid)) | |
08036331 | 3012 | { |
f3f8ece4 PA |
3013 | switch_to_thread_no_regs (tp); |
3014 | ||
4d9d9d04 PA |
3015 | /* Ignore the current thread here. It's handled |
3016 | afterwards. */ | |
08036331 | 3017 | if (tp == cur_thr) |
4d9d9d04 | 3018 | continue; |
c906108c | 3019 | |
4d9d9d04 PA |
3020 | if (!thread_still_needs_step_over (tp)) |
3021 | continue; | |
3022 | ||
3023 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3024 | |
99619bea PA |
3025 | if (debug_infrun) |
3026 | fprintf_unfiltered (gdb_stdlog, | |
3027 | "infrun: need to step-over [%s] first\n", | |
a068643d | 3028 | target_pid_to_str (tp->ptid).c_str ()); |
99619bea | 3029 | |
4d9d9d04 | 3030 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3031 | } |
f3f8ece4 PA |
3032 | |
3033 | switch_to_thread (cur_thr); | |
30852783 UW |
3034 | } |
3035 | ||
4d9d9d04 PA |
3036 | /* Enqueue the current thread last, so that we move all other |
3037 | threads over their breakpoints first. */ | |
08036331 PA |
3038 | if (cur_thr->stepping_over_breakpoint) |
3039 | thread_step_over_chain_enqueue (cur_thr); | |
30852783 | 3040 | |
4d9d9d04 PA |
3041 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3042 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3043 | advanced. Must do this before resuming any thread, as in | |
3044 | all-stop/remote, once we resume we can't send any other packet | |
3045 | until the target stops again. */ | |
08036331 | 3046 | cur_thr->prev_pc = regcache_read_pc (regcache); |
99619bea | 3047 | |
a9bc57b9 TT |
3048 | { |
3049 | scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume (); | |
85ad3aaf | 3050 | |
a9bc57b9 | 3051 | started = start_step_over (); |
c906108c | 3052 | |
a9bc57b9 TT |
3053 | if (step_over_info_valid_p ()) |
3054 | { | |
3055 | /* Either this thread started a new in-line step over, or some | |
3056 | other thread was already doing one. In either case, don't | |
3057 | resume anything else until the step-over is finished. */ | |
3058 | } | |
3059 | else if (started && !target_is_non_stop_p ()) | |
3060 | { | |
3061 | /* A new displaced stepping sequence was started. In all-stop, | |
3062 | we can't talk to the target anymore until it next stops. */ | |
3063 | } | |
3064 | else if (!non_stop && target_is_non_stop_p ()) | |
3065 | { | |
3066 | /* In all-stop, but the target is always in non-stop mode. | |
3067 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3068 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3069 | resume_ptid)) | |
3070 | { | |
3071 | switch_to_thread_no_regs (tp); | |
3072 | ||
3073 | if (!tp->inf->has_execution ()) | |
3074 | { | |
3075 | if (debug_infrun) | |
3076 | fprintf_unfiltered (gdb_stdlog, | |
3077 | "infrun: proceed: [%s] target has " | |
3078 | "no execution\n", | |
3079 | target_pid_to_str (tp->ptid).c_str ()); | |
3080 | continue; | |
3081 | } | |
f3f8ece4 | 3082 | |
fbea99ea PA |
3083 | if (tp->resumed) |
3084 | { | |
3085 | if (debug_infrun) | |
3086 | fprintf_unfiltered (gdb_stdlog, | |
3087 | "infrun: proceed: [%s] resumed\n", | |
a068643d | 3088 | target_pid_to_str (tp->ptid).c_str ()); |
fbea99ea PA |
3089 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
3090 | continue; | |
3091 | } | |
3092 | ||
3093 | if (thread_is_in_step_over_chain (tp)) | |
3094 | { | |
3095 | if (debug_infrun) | |
3096 | fprintf_unfiltered (gdb_stdlog, | |
3097 | "infrun: proceed: [%s] needs step-over\n", | |
a068643d | 3098 | target_pid_to_str (tp->ptid).c_str ()); |
fbea99ea PA |
3099 | continue; |
3100 | } | |
3101 | ||
3102 | if (debug_infrun) | |
3103 | fprintf_unfiltered (gdb_stdlog, | |
3104 | "infrun: proceed: resuming %s\n", | |
a068643d | 3105 | target_pid_to_str (tp->ptid).c_str ()); |
fbea99ea PA |
3106 | |
3107 | reset_ecs (ecs, tp); | |
00431a78 | 3108 | switch_to_thread (tp); |
fbea99ea PA |
3109 | keep_going_pass_signal (ecs); |
3110 | if (!ecs->wait_some_more) | |
fd7dcb94 | 3111 | error (_("Command aborted.")); |
fbea99ea | 3112 | } |
a9bc57b9 | 3113 | } |
08036331 | 3114 | else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3115 | { |
3116 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3117 | reset_ecs (ecs, cur_thr); |
3118 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3119 | keep_going_pass_signal (ecs); |
3120 | if (!ecs->wait_some_more) | |
3121 | error (_("Command aborted.")); | |
3122 | } | |
3123 | } | |
c906108c | 3124 | |
5b6d1e4f | 3125 | commit_resume_all_targets (); |
85ad3aaf | 3126 | |
731f534f | 3127 | finish_state.release (); |
c906108c | 3128 | |
873657b9 PA |
3129 | /* If we've switched threads above, switch back to the previously |
3130 | current thread. We don't want the user to see a different | |
3131 | selected thread. */ | |
3132 | switch_to_thread (cur_thr); | |
3133 | ||
0b333c5e PA |
3134 | /* Tell the event loop to wait for it to stop. If the target |
3135 | supports asynchronous execution, it'll do this from within | |
3136 | target_resume. */ | |
362646f5 | 3137 | if (!target_can_async_p ()) |
0b333c5e | 3138 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3139 | } |
c906108c SS |
3140 | \f |
3141 | ||
3142 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3143 | |
c906108c | 3144 | void |
8621d6a9 | 3145 | start_remote (int from_tty) |
c906108c | 3146 | { |
5b6d1e4f PA |
3147 | inferior *inf = current_inferior (); |
3148 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3149 | |
1777feb0 | 3150 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3151 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3152 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3153 | nothing is returned (instead of just blocking). Because of this, |
3154 | targets expecting an immediate response need to, internally, set | |
3155 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3156 | timeout. */ |
6426a772 JM |
3157 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3158 | differentiate to its caller what the state of the target is after | |
3159 | the initial open has been performed. Here we're assuming that | |
3160 | the target has stopped. It should be possible to eventually have | |
3161 | target_open() return to the caller an indication that the target | |
3162 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3163 | for an async run. */ |
5b6d1e4f | 3164 | wait_for_inferior (inf); |
8621d6a9 DJ |
3165 | |
3166 | /* Now that the inferior has stopped, do any bookkeeping like | |
3167 | loading shared libraries. We want to do this before normal_stop, | |
3168 | so that the displayed frame is up to date. */ | |
8b88a78e | 3169 | post_create_inferior (current_top_target (), from_tty); |
8621d6a9 | 3170 | |
6426a772 | 3171 | normal_stop (); |
c906108c SS |
3172 | } |
3173 | ||
3174 | /* Initialize static vars when a new inferior begins. */ | |
3175 | ||
3176 | void | |
96baa820 | 3177 | init_wait_for_inferior (void) |
c906108c SS |
3178 | { |
3179 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3180 | |
c906108c SS |
3181 | breakpoint_init_inferior (inf_starting); |
3182 | ||
70509625 | 3183 | clear_proceed_status (0); |
9f976b41 | 3184 | |
ab1ddbcf | 3185 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3186 | |
842951eb | 3187 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3188 | } |
237fc4c9 | 3189 | |
c906108c | 3190 | \f |
488f131b | 3191 | |
ec9499be | 3192 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3193 | |
568d6575 UW |
3194 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3195 | struct execution_control_state *ecs); | |
3196 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3197 | struct execution_control_state *ecs); | |
4f5d7f63 | 3198 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3199 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3200 | struct frame_info *); |
611c83ae | 3201 | |
bdc36728 | 3202 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3203 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3204 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3205 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3206 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3207 | |
252fbfc8 PA |
3208 | /* This function is attached as a "thread_stop_requested" observer. |
3209 | Cleanup local state that assumed the PTID was to be resumed, and | |
3210 | report the stop to the frontend. */ | |
3211 | ||
2c0b251b | 3212 | static void |
252fbfc8 PA |
3213 | infrun_thread_stop_requested (ptid_t ptid) |
3214 | { | |
5b6d1e4f PA |
3215 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3216 | ||
c65d6b55 PA |
3217 | /* PTID was requested to stop. If the thread was already stopped, |
3218 | but the user/frontend doesn't know about that yet (e.g., the | |
3219 | thread had been temporarily paused for some step-over), set up | |
3220 | for reporting the stop now. */ | |
5b6d1e4f | 3221 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3222 | { |
3223 | if (tp->state != THREAD_RUNNING) | |
3224 | continue; | |
3225 | if (tp->executing) | |
3226 | continue; | |
c65d6b55 | 3227 | |
08036331 PA |
3228 | /* Remove matching threads from the step-over queue, so |
3229 | start_step_over doesn't try to resume them | |
3230 | automatically. */ | |
3231 | if (thread_is_in_step_over_chain (tp)) | |
3232 | thread_step_over_chain_remove (tp); | |
c65d6b55 | 3233 | |
08036331 PA |
3234 | /* If the thread is stopped, but the user/frontend doesn't |
3235 | know about that yet, queue a pending event, as if the | |
3236 | thread had just stopped now. Unless the thread already had | |
3237 | a pending event. */ | |
3238 | if (!tp->suspend.waitstatus_pending_p) | |
3239 | { | |
3240 | tp->suspend.waitstatus_pending_p = 1; | |
3241 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3242 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3243 | } | |
c65d6b55 | 3244 | |
08036331 PA |
3245 | /* Clear the inline-frame state, since we're re-processing the |
3246 | stop. */ | |
5b6d1e4f | 3247 | clear_inline_frame_state (tp); |
c65d6b55 | 3248 | |
08036331 PA |
3249 | /* If this thread was paused because some other thread was |
3250 | doing an inline-step over, let that finish first. Once | |
3251 | that happens, we'll restart all threads and consume pending | |
3252 | stop events then. */ | |
3253 | if (step_over_info_valid_p ()) | |
3254 | continue; | |
3255 | ||
3256 | /* Otherwise we can process the (new) pending event now. Set | |
3257 | it so this pending event is considered by | |
3258 | do_target_wait. */ | |
3259 | tp->resumed = 1; | |
3260 | } | |
252fbfc8 PA |
3261 | } |
3262 | ||
a07daef3 PA |
3263 | static void |
3264 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3265 | { | |
5b6d1e4f PA |
3266 | if (target_last_proc_target == tp->inf->process_target () |
3267 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3268 | nullify_last_target_wait_ptid (); |
3269 | } | |
3270 | ||
0cbcdb96 PA |
3271 | /* Delete the step resume, single-step and longjmp/exception resume |
3272 | breakpoints of TP. */ | |
4e1c45ea | 3273 | |
0cbcdb96 PA |
3274 | static void |
3275 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3276 | { |
0cbcdb96 PA |
3277 | delete_step_resume_breakpoint (tp); |
3278 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3279 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3280 | } |
3281 | ||
0cbcdb96 PA |
3282 | /* If the target still has execution, call FUNC for each thread that |
3283 | just stopped. In all-stop, that's all the non-exited threads; in | |
3284 | non-stop, that's the current thread, only. */ | |
3285 | ||
3286 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3287 | (struct thread_info *tp); | |
4e1c45ea PA |
3288 | |
3289 | static void | |
0cbcdb96 | 3290 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3291 | { |
d7e15655 | 3292 | if (!target_has_execution || inferior_ptid == null_ptid) |
4e1c45ea PA |
3293 | return; |
3294 | ||
fbea99ea | 3295 | if (target_is_non_stop_p ()) |
4e1c45ea | 3296 | { |
0cbcdb96 PA |
3297 | /* If in non-stop mode, only the current thread stopped. */ |
3298 | func (inferior_thread ()); | |
4e1c45ea PA |
3299 | } |
3300 | else | |
0cbcdb96 | 3301 | { |
0cbcdb96 | 3302 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3303 | for (thread_info *tp : all_non_exited_threads ()) |
3304 | func (tp); | |
0cbcdb96 PA |
3305 | } |
3306 | } | |
3307 | ||
3308 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3309 | the threads that just stopped. */ | |
3310 | ||
3311 | static void | |
3312 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3313 | { | |
3314 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3315 | } |
3316 | ||
3317 | /* Delete the single-step breakpoints of the threads that just | |
3318 | stopped. */ | |
7c16b83e | 3319 | |
34b7e8a6 PA |
3320 | static void |
3321 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3322 | { | |
3323 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3324 | } |
3325 | ||
221e1a37 | 3326 | /* See infrun.h. */ |
223698f8 | 3327 | |
221e1a37 | 3328 | void |
223698f8 DE |
3329 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3330 | const struct target_waitstatus *ws) | |
3331 | { | |
23fdd69e | 3332 | std::string status_string = target_waitstatus_to_string (ws); |
d7e74731 | 3333 | string_file stb; |
223698f8 DE |
3334 | |
3335 | /* The text is split over several lines because it was getting too long. | |
3336 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3337 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3338 | is set. */ | |
3339 | ||
d7e74731 | 3340 | stb.printf ("infrun: target_wait (%d.%ld.%ld", |
e99b03dc | 3341 | waiton_ptid.pid (), |
e38504b3 | 3342 | waiton_ptid.lwp (), |
cc6bcb54 | 3343 | waiton_ptid.tid ()); |
e99b03dc | 3344 | if (waiton_ptid.pid () != -1) |
a068643d | 3345 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid).c_str ()); |
d7e74731 PA |
3346 | stb.printf (", status) =\n"); |
3347 | stb.printf ("infrun: %d.%ld.%ld [%s],\n", | |
e99b03dc | 3348 | result_ptid.pid (), |
e38504b3 | 3349 | result_ptid.lwp (), |
cc6bcb54 | 3350 | result_ptid.tid (), |
a068643d | 3351 | target_pid_to_str (result_ptid).c_str ()); |
23fdd69e | 3352 | stb.printf ("infrun: %s\n", status_string.c_str ()); |
223698f8 DE |
3353 | |
3354 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3355 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3356 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3357 | } |
3358 | ||
372316f1 PA |
3359 | /* Select a thread at random, out of those which are resumed and have |
3360 | had events. */ | |
3361 | ||
3362 | static struct thread_info * | |
5b6d1e4f | 3363 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3364 | { |
372316f1 | 3365 | int num_events = 0; |
08036331 | 3366 | |
5b6d1e4f | 3367 | auto has_event = [&] (thread_info *tp) |
08036331 | 3368 | { |
5b6d1e4f PA |
3369 | return (tp->ptid.matches (waiton_ptid) |
3370 | && tp->resumed | |
08036331 PA |
3371 | && tp->suspend.waitstatus_pending_p); |
3372 | }; | |
372316f1 PA |
3373 | |
3374 | /* First see how many events we have. Count only resumed threads | |
3375 | that have an event pending. */ | |
5b6d1e4f | 3376 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3377 | if (has_event (tp)) |
372316f1 PA |
3378 | num_events++; |
3379 | ||
3380 | if (num_events == 0) | |
3381 | return NULL; | |
3382 | ||
3383 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3384 | int random_selector = (int) ((num_events * (double) rand ()) |
3385 | / (RAND_MAX + 1.0)); | |
372316f1 PA |
3386 | |
3387 | if (debug_infrun && num_events > 1) | |
3388 | fprintf_unfiltered (gdb_stdlog, | |
3389 | "infrun: Found %d events, selecting #%d\n", | |
3390 | num_events, random_selector); | |
3391 | ||
3392 | /* Select the Nth thread that has had an event. */ | |
5b6d1e4f | 3393 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3394 | if (has_event (tp)) |
372316f1 | 3395 | if (random_selector-- == 0) |
08036331 | 3396 | return tp; |
372316f1 | 3397 | |
08036331 | 3398 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3399 | } |
3400 | ||
3401 | /* Wrapper for target_wait that first checks whether threads have | |
3402 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3403 | more events. INF is the inferior we're using to call target_wait |
3404 | on. */ | |
372316f1 PA |
3405 | |
3406 | static ptid_t | |
5b6d1e4f PA |
3407 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
3408 | target_waitstatus *status, int options) | |
372316f1 PA |
3409 | { |
3410 | ptid_t event_ptid; | |
3411 | struct thread_info *tp; | |
3412 | ||
3413 | /* First check if there is a resumed thread with a wait status | |
3414 | pending. */ | |
d7e15655 | 3415 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3416 | { |
5b6d1e4f | 3417 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3418 | } |
3419 | else | |
3420 | { | |
3421 | if (debug_infrun) | |
3422 | fprintf_unfiltered (gdb_stdlog, | |
3423 | "infrun: Waiting for specific thread %s.\n", | |
a068643d | 3424 | target_pid_to_str (ptid).c_str ()); |
372316f1 PA |
3425 | |
3426 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3427 | tp = find_thread_ptid (inf, ptid); |
372316f1 PA |
3428 | gdb_assert (tp != NULL); |
3429 | if (!tp->suspend.waitstatus_pending_p) | |
3430 | tp = NULL; | |
3431 | } | |
3432 | ||
3433 | if (tp != NULL | |
3434 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3435 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3436 | { | |
00431a78 | 3437 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3438 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3439 | CORE_ADDR pc; |
3440 | int discard = 0; | |
3441 | ||
3442 | pc = regcache_read_pc (regcache); | |
3443 | ||
3444 | if (pc != tp->suspend.stop_pc) | |
3445 | { | |
3446 | if (debug_infrun) | |
3447 | fprintf_unfiltered (gdb_stdlog, | |
3448 | "infrun: PC of %s changed. was=%s, now=%s\n", | |
a068643d | 3449 | target_pid_to_str (tp->ptid).c_str (), |
defd2172 | 3450 | paddress (gdbarch, tp->suspend.stop_pc), |
372316f1 PA |
3451 | paddress (gdbarch, pc)); |
3452 | discard = 1; | |
3453 | } | |
a01bda52 | 3454 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 PA |
3455 | { |
3456 | if (debug_infrun) | |
3457 | fprintf_unfiltered (gdb_stdlog, | |
3458 | "infrun: previous breakpoint of %s, at %s gone\n", | |
a068643d | 3459 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
3460 | paddress (gdbarch, pc)); |
3461 | ||
3462 | discard = 1; | |
3463 | } | |
3464 | ||
3465 | if (discard) | |
3466 | { | |
3467 | if (debug_infrun) | |
3468 | fprintf_unfiltered (gdb_stdlog, | |
3469 | "infrun: pending event of %s cancelled.\n", | |
a068643d | 3470 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
3471 | |
3472 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3473 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3474 | } | |
3475 | } | |
3476 | ||
3477 | if (tp != NULL) | |
3478 | { | |
3479 | if (debug_infrun) | |
3480 | { | |
23fdd69e SM |
3481 | std::string statstr |
3482 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 3483 | |
372316f1 PA |
3484 | fprintf_unfiltered (gdb_stdlog, |
3485 | "infrun: Using pending wait status %s for %s.\n", | |
23fdd69e | 3486 | statstr.c_str (), |
a068643d | 3487 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
3488 | } |
3489 | ||
3490 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3491 | if it was a software breakpoint (and the target doesn't | |
3492 | always adjust the PC itself). */ | |
3493 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3494 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3495 | { | |
3496 | struct regcache *regcache; | |
3497 | struct gdbarch *gdbarch; | |
3498 | int decr_pc; | |
3499 | ||
00431a78 | 3500 | regcache = get_thread_regcache (tp); |
ac7936df | 3501 | gdbarch = regcache->arch (); |
372316f1 PA |
3502 | |
3503 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3504 | if (decr_pc != 0) | |
3505 | { | |
3506 | CORE_ADDR pc; | |
3507 | ||
3508 | pc = regcache_read_pc (regcache); | |
3509 | regcache_write_pc (regcache, pc + decr_pc); | |
3510 | } | |
3511 | } | |
3512 | ||
3513 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3514 | *status = tp->suspend.waitstatus; | |
3515 | tp->suspend.waitstatus_pending_p = 0; | |
3516 | ||
3517 | /* Wake up the event loop again, until all pending events are | |
3518 | processed. */ | |
3519 | if (target_is_async_p ()) | |
3520 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3521 | return tp->ptid; | |
3522 | } | |
3523 | ||
3524 | /* But if we don't find one, we'll have to wait. */ | |
3525 | ||
3526 | if (deprecated_target_wait_hook) | |
3527 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3528 | else | |
3529 | event_ptid = target_wait (ptid, status, options); | |
3530 | ||
3531 | return event_ptid; | |
3532 | } | |
3533 | ||
5b6d1e4f PA |
3534 | /* Returns true if INF has any resumed thread with a status |
3535 | pending. */ | |
3536 | ||
3537 | static bool | |
3538 | threads_are_resumed_pending_p (inferior *inf) | |
3539 | { | |
3540 | for (thread_info *tp : inf->non_exited_threads ()) | |
3541 | if (tp->resumed | |
3542 | && tp->suspend.waitstatus_pending_p) | |
3543 | return true; | |
3544 | ||
3545 | return false; | |
3546 | } | |
3547 | ||
3548 | /* Wrapper for target_wait that first checks whether threads have | |
3549 | pending statuses to report before actually asking the target for | |
3550 | more events. Polls for events from all inferiors/targets. */ | |
3551 | ||
3552 | static bool | |
3553 | do_target_wait (ptid_t wait_ptid, execution_control_state *ecs, int options) | |
3554 | { | |
3555 | int num_inferiors = 0; | |
3556 | int random_selector; | |
3557 | ||
3558 | /* For fairness, we pick the first inferior/target to poll at | |
3559 | random, and then continue polling the rest of the inferior list | |
3560 | starting from that one in a circular fashion until the whole list | |
3561 | is polled once. */ | |
3562 | ||
3563 | auto inferior_matches = [&wait_ptid] (inferior *inf) | |
3564 | { | |
3565 | return (inf->process_target () != NULL | |
3566 | && (threads_are_executing (inf->process_target ()) | |
3567 | || threads_are_resumed_pending_p (inf)) | |
3568 | && ptid_t (inf->pid).matches (wait_ptid)); | |
3569 | }; | |
3570 | ||
3571 | /* First see how many resumed inferiors we have. */ | |
3572 | for (inferior *inf : all_inferiors ()) | |
3573 | if (inferior_matches (inf)) | |
3574 | num_inferiors++; | |
3575 | ||
3576 | if (num_inferiors == 0) | |
3577 | { | |
3578 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3579 | return false; | |
3580 | } | |
3581 | ||
3582 | /* Now randomly pick an inferior out of those that were resumed. */ | |
3583 | random_selector = (int) | |
3584 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3585 | ||
3586 | if (debug_infrun && num_inferiors > 1) | |
3587 | fprintf_unfiltered (gdb_stdlog, | |
3588 | "infrun: Found %d inferiors, starting at #%d\n", | |
3589 | num_inferiors, random_selector); | |
3590 | ||
3591 | /* Select the Nth inferior that was resumed. */ | |
3592 | ||
3593 | inferior *selected = nullptr; | |
3594 | ||
3595 | for (inferior *inf : all_inferiors ()) | |
3596 | if (inferior_matches (inf)) | |
3597 | if (random_selector-- == 0) | |
3598 | { | |
3599 | selected = inf; | |
3600 | break; | |
3601 | } | |
3602 | ||
3603 | /* Now poll for events out of each of the resumed inferior's | |
3604 | targets, starting from the selected one. */ | |
3605 | ||
3606 | auto do_wait = [&] (inferior *inf) | |
3607 | { | |
3608 | switch_to_inferior_no_thread (inf); | |
3609 | ||
3610 | ecs->ptid = do_target_wait_1 (inf, wait_ptid, &ecs->ws, options); | |
3611 | ecs->target = inf->process_target (); | |
3612 | return (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3613 | }; | |
3614 | ||
3615 | /* Needed in all-stop+target-non-stop mode, because we end up here | |
3616 | spuriously after the target is all stopped and we've already | |
3617 | reported the stop to the user, polling for events. */ | |
3618 | scoped_restore_current_thread restore_thread; | |
3619 | ||
3620 | int inf_num = selected->num; | |
3621 | for (inferior *inf = selected; inf != NULL; inf = inf->next) | |
3622 | if (inferior_matches (inf)) | |
3623 | if (do_wait (inf)) | |
3624 | return true; | |
3625 | ||
3626 | for (inferior *inf = inferior_list; | |
3627 | inf != NULL && inf->num < inf_num; | |
3628 | inf = inf->next) | |
3629 | if (inferior_matches (inf)) | |
3630 | if (do_wait (inf)) | |
3631 | return true; | |
3632 | ||
3633 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3634 | return false; | |
3635 | } | |
3636 | ||
24291992 PA |
3637 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3638 | detaching while a thread is displaced stepping is a recipe for | |
3639 | crashing it, as nothing would readjust the PC out of the scratch | |
3640 | pad. */ | |
3641 | ||
3642 | void | |
3643 | prepare_for_detach (void) | |
3644 | { | |
3645 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3646 | ptid_t pid_ptid = ptid_t (inf->pid); |
24291992 | 3647 | |
00431a78 | 3648 | displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf); |
24291992 PA |
3649 | |
3650 | /* Is any thread of this process displaced stepping? If not, | |
3651 | there's nothing else to do. */ | |
d20172fc | 3652 | if (displaced->step_thread == nullptr) |
24291992 PA |
3653 | return; |
3654 | ||
3655 | if (debug_infrun) | |
3656 | fprintf_unfiltered (gdb_stdlog, | |
3657 | "displaced-stepping in-process while detaching"); | |
3658 | ||
9bcb1f16 | 3659 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3660 | |
00431a78 | 3661 | while (displaced->step_thread != nullptr) |
24291992 | 3662 | { |
24291992 PA |
3663 | struct execution_control_state ecss; |
3664 | struct execution_control_state *ecs; | |
3665 | ||
3666 | ecs = &ecss; | |
3667 | memset (ecs, 0, sizeof (*ecs)); | |
3668 | ||
3669 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3670 | /* Flush target cache before starting to handle each event. |
3671 | Target was running and cache could be stale. This is just a | |
3672 | heuristic. Running threads may modify target memory, but we | |
3673 | don't get any event. */ | |
3674 | target_dcache_invalidate (); | |
24291992 | 3675 | |
5b6d1e4f | 3676 | do_target_wait (pid_ptid, ecs, 0); |
24291992 PA |
3677 | |
3678 | if (debug_infrun) | |
3679 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3680 | ||
3681 | /* If an error happens while handling the event, propagate GDB's | |
3682 | knowledge of the executing state to the frontend/user running | |
3683 | state. */ | |
5b6d1e4f PA |
3684 | scoped_finish_thread_state finish_state (inf->process_target (), |
3685 | minus_one_ptid); | |
24291992 PA |
3686 | |
3687 | /* Now figure out what to do with the result of the result. */ | |
3688 | handle_inferior_event (ecs); | |
3689 | ||
3690 | /* No error, don't finish the state yet. */ | |
731f534f | 3691 | finish_state.release (); |
24291992 PA |
3692 | |
3693 | /* Breakpoints and watchpoints are not installed on the target | |
3694 | at this point, and signals are passed directly to the | |
3695 | inferior, so this must mean the process is gone. */ | |
3696 | if (!ecs->wait_some_more) | |
3697 | { | |
9bcb1f16 | 3698 | restore_detaching.release (); |
24291992 PA |
3699 | error (_("Program exited while detaching")); |
3700 | } | |
3701 | } | |
3702 | ||
9bcb1f16 | 3703 | restore_detaching.release (); |
24291992 PA |
3704 | } |
3705 | ||
cd0fc7c3 | 3706 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3707 | |
cd0fc7c3 SS |
3708 | If inferior gets a signal, we may decide to start it up again |
3709 | instead of returning. That is why there is a loop in this function. | |
3710 | When this function actually returns it means the inferior | |
3711 | should be left stopped and GDB should read more commands. */ | |
3712 | ||
5b6d1e4f PA |
3713 | static void |
3714 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3715 | { |
527159b7 | 3716 | if (debug_infrun) |
ae123ec6 | 3717 | fprintf_unfiltered |
e4c8541f | 3718 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3719 | |
4c41382a | 3720 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3721 | |
e6f5c25b PA |
3722 | /* If an error happens while handling the event, propagate GDB's |
3723 | knowledge of the executing state to the frontend/user running | |
3724 | state. */ | |
5b6d1e4f PA |
3725 | scoped_finish_thread_state finish_state |
3726 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 3727 | |
c906108c SS |
3728 | while (1) |
3729 | { | |
ae25568b PA |
3730 | struct execution_control_state ecss; |
3731 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 3732 | |
ae25568b PA |
3733 | memset (ecs, 0, sizeof (*ecs)); |
3734 | ||
ec9499be | 3735 | overlay_cache_invalid = 1; |
ec9499be | 3736 | |
f15cb84a YQ |
3737 | /* Flush target cache before starting to handle each event. |
3738 | Target was running and cache could be stale. This is just a | |
3739 | heuristic. Running threads may modify target memory, but we | |
3740 | don't get any event. */ | |
3741 | target_dcache_invalidate (); | |
3742 | ||
5b6d1e4f PA |
3743 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
3744 | ecs->target = inf->process_target (); | |
c906108c | 3745 | |
f00150c9 | 3746 | if (debug_infrun) |
5b6d1e4f | 3747 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3748 | |
cd0fc7c3 SS |
3749 | /* Now figure out what to do with the result of the result. */ |
3750 | handle_inferior_event (ecs); | |
c906108c | 3751 | |
cd0fc7c3 SS |
3752 | if (!ecs->wait_some_more) |
3753 | break; | |
3754 | } | |
4e1c45ea | 3755 | |
e6f5c25b | 3756 | /* No error, don't finish the state yet. */ |
731f534f | 3757 | finish_state.release (); |
cd0fc7c3 | 3758 | } |
c906108c | 3759 | |
d3d4baed PA |
3760 | /* Cleanup that reinstalls the readline callback handler, if the |
3761 | target is running in the background. If while handling the target | |
3762 | event something triggered a secondary prompt, like e.g., a | |
3763 | pagination prompt, we'll have removed the callback handler (see | |
3764 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3765 | event loop, ready to process further input. Note this has no | |
3766 | effect if the handler hasn't actually been removed, because calling | |
3767 | rl_callback_handler_install resets the line buffer, thus losing | |
3768 | input. */ | |
3769 | ||
3770 | static void | |
d238133d | 3771 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 3772 | { |
3b12939d PA |
3773 | struct ui *ui = current_ui; |
3774 | ||
3775 | if (!ui->async) | |
6c400b59 PA |
3776 | { |
3777 | /* We're not going back to the top level event loop yet. Don't | |
3778 | install the readline callback, as it'd prep the terminal, | |
3779 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3780 | it the next time the prompt is displayed, when we're ready | |
3781 | for input. */ | |
3782 | return; | |
3783 | } | |
3784 | ||
3b12939d | 3785 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3786 | gdb_rl_callback_handler_reinstall (); |
3787 | } | |
3788 | ||
243a9253 PA |
3789 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3790 | that's just the event thread. In all-stop, that's all threads. */ | |
3791 | ||
3792 | static void | |
3793 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3794 | { | |
08036331 PA |
3795 | if (ecs->event_thread != NULL |
3796 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 3797 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
3798 | |
3799 | if (!non_stop) | |
3800 | { | |
08036331 | 3801 | for (thread_info *thr : all_non_exited_threads ()) |
243a9253 PA |
3802 | { |
3803 | if (thr->thread_fsm == NULL) | |
3804 | continue; | |
3805 | if (thr == ecs->event_thread) | |
3806 | continue; | |
3807 | ||
00431a78 | 3808 | switch_to_thread (thr); |
46e3ed7f | 3809 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
3810 | } |
3811 | ||
3812 | if (ecs->event_thread != NULL) | |
00431a78 | 3813 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3814 | } |
3815 | } | |
3816 | ||
3b12939d PA |
3817 | /* Helper for all_uis_check_sync_execution_done that works on the |
3818 | current UI. */ | |
3819 | ||
3820 | static void | |
3821 | check_curr_ui_sync_execution_done (void) | |
3822 | { | |
3823 | struct ui *ui = current_ui; | |
3824 | ||
3825 | if (ui->prompt_state == PROMPT_NEEDED | |
3826 | && ui->async | |
3827 | && !gdb_in_secondary_prompt_p (ui)) | |
3828 | { | |
223ffa71 | 3829 | target_terminal::ours (); |
76727919 | 3830 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3831 | ui_register_input_event_handler (ui); |
3b12939d PA |
3832 | } |
3833 | } | |
3834 | ||
3835 | /* See infrun.h. */ | |
3836 | ||
3837 | void | |
3838 | all_uis_check_sync_execution_done (void) | |
3839 | { | |
0e454242 | 3840 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3841 | { |
3842 | check_curr_ui_sync_execution_done (); | |
3843 | } | |
3844 | } | |
3845 | ||
a8836c93 PA |
3846 | /* See infrun.h. */ |
3847 | ||
3848 | void | |
3849 | all_uis_on_sync_execution_starting (void) | |
3850 | { | |
0e454242 | 3851 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3852 | { |
3853 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3854 | async_disable_stdin (); | |
3855 | } | |
3856 | } | |
3857 | ||
1777feb0 | 3858 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3859 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3860 | descriptor corresponding to the target. It can be called more than |
3861 | once to complete a single execution command. In such cases we need | |
3862 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3863 | that this function is called for a single execution command, then |
3864 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3865 | necessary cleanups. */ |
43ff13b4 JM |
3866 | |
3867 | void | |
fba45db2 | 3868 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3869 | { |
0d1e5fa7 | 3870 | struct execution_control_state ecss; |
a474d7c2 | 3871 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 3872 | int cmd_done = 0; |
43ff13b4 | 3873 | |
0d1e5fa7 PA |
3874 | memset (ecs, 0, sizeof (*ecs)); |
3875 | ||
c61db772 PA |
3876 | /* Events are always processed with the main UI as current UI. This |
3877 | way, warnings, debug output, etc. are always consistently sent to | |
3878 | the main console. */ | |
4b6749b9 | 3879 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3880 | |
d3d4baed | 3881 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
3882 | { |
3883 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
3884 | ||
3885 | /* We're handling a live event, so make sure we're doing live | |
3886 | debugging. If we're looking at traceframes while the target is | |
3887 | running, we're going to need to get back to that mode after | |
3888 | handling the event. */ | |
3889 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
3890 | if (non_stop) | |
3891 | { | |
3892 | maybe_restore_traceframe.emplace (); | |
3893 | set_current_traceframe (-1); | |
3894 | } | |
43ff13b4 | 3895 | |
873657b9 PA |
3896 | /* The user/frontend should not notice a thread switch due to |
3897 | internal events. Make sure we revert to the user selected | |
3898 | thread and frame after handling the event and running any | |
3899 | breakpoint commands. */ | |
3900 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
3901 | |
3902 | overlay_cache_invalid = 1; | |
3903 | /* Flush target cache before starting to handle each event. Target | |
3904 | was running and cache could be stale. This is just a heuristic. | |
3905 | Running threads may modify target memory, but we don't get any | |
3906 | event. */ | |
3907 | target_dcache_invalidate (); | |
3908 | ||
3909 | scoped_restore save_exec_dir | |
3910 | = make_scoped_restore (&execution_direction, | |
3911 | target_execution_direction ()); | |
3912 | ||
5b6d1e4f PA |
3913 | if (!do_target_wait (minus_one_ptid, ecs, TARGET_WNOHANG)) |
3914 | return; | |
3915 | ||
3916 | gdb_assert (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3917 | ||
3918 | /* Switch to the target that generated the event, so we can do | |
3919 | target calls. Any inferior bound to the target will do, so we | |
3920 | just switch to the first we find. */ | |
3921 | for (inferior *inf : all_inferiors (ecs->target)) | |
3922 | { | |
3923 | switch_to_inferior_no_thread (inf); | |
3924 | break; | |
3925 | } | |
d238133d TT |
3926 | |
3927 | if (debug_infrun) | |
5b6d1e4f | 3928 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
d238133d TT |
3929 | |
3930 | /* If an error happens while handling the event, propagate GDB's | |
3931 | knowledge of the executing state to the frontend/user running | |
3932 | state. */ | |
3933 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 3934 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 3935 | |
979a0d13 | 3936 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
3937 | still for the thread which has thrown the exception. */ |
3938 | auto defer_bpstat_clear | |
3939 | = make_scope_exit (bpstat_clear_actions); | |
3940 | auto defer_delete_threads | |
3941 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
3942 | ||
3943 | /* Now figure out what to do with the result of the result. */ | |
3944 | handle_inferior_event (ecs); | |
3945 | ||
3946 | if (!ecs->wait_some_more) | |
3947 | { | |
5b6d1e4f | 3948 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
d238133d TT |
3949 | int should_stop = 1; |
3950 | struct thread_info *thr = ecs->event_thread; | |
d6b48e9c | 3951 | |
d238133d | 3952 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 3953 | |
d238133d TT |
3954 | if (thr != NULL) |
3955 | { | |
3956 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 3957 | |
d238133d | 3958 | if (thread_fsm != NULL) |
46e3ed7f | 3959 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 3960 | } |
243a9253 | 3961 | |
d238133d TT |
3962 | if (!should_stop) |
3963 | { | |
3964 | keep_going (ecs); | |
3965 | } | |
3966 | else | |
3967 | { | |
46e3ed7f | 3968 | bool should_notify_stop = true; |
d238133d | 3969 | int proceeded = 0; |
1840d81a | 3970 | |
d238133d | 3971 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 3972 | |
d238133d | 3973 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 3974 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 3975 | |
d238133d TT |
3976 | if (should_notify_stop) |
3977 | { | |
3978 | /* We may not find an inferior if this was a process exit. */ | |
3979 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
3980 | proceeded = normal_stop (); | |
3981 | } | |
243a9253 | 3982 | |
d238133d TT |
3983 | if (!proceeded) |
3984 | { | |
3985 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
3986 | cmd_done = 1; | |
3987 | } | |
873657b9 PA |
3988 | |
3989 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
3990 | previously selected thread is gone. We have two | |
3991 | choices - switch to no thread selected, or restore the | |
3992 | previously selected thread (now exited). We chose the | |
3993 | later, just because that's what GDB used to do. After | |
3994 | this, "info threads" says "The current thread <Thread | |
3995 | ID 2> has terminated." instead of "No thread | |
3996 | selected.". */ | |
3997 | if (!non_stop | |
3998 | && cmd_done | |
3999 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
4000 | restore_thread.dont_restore (); | |
d238133d TT |
4001 | } |
4002 | } | |
4f8d22e3 | 4003 | |
d238133d TT |
4004 | defer_delete_threads.release (); |
4005 | defer_bpstat_clear.release (); | |
29f49a6a | 4006 | |
d238133d TT |
4007 | /* No error, don't finish the thread states yet. */ |
4008 | finish_state.release (); | |
731f534f | 4009 | |
d238133d TT |
4010 | /* This scope is used to ensure that readline callbacks are |
4011 | reinstalled here. */ | |
4012 | } | |
4f8d22e3 | 4013 | |
3b12939d PA |
4014 | /* If a UI was in sync execution mode, and now isn't, restore its |
4015 | prompt (a synchronous execution command has finished, and we're | |
4016 | ready for input). */ | |
4017 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4018 | |
4019 | if (cmd_done | |
0f641c01 | 4020 | && exec_done_display_p |
00431a78 PA |
4021 | && (inferior_ptid == null_ptid |
4022 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 4023 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
4024 | } |
4025 | ||
edb3359d DJ |
4026 | /* Record the frame and location we're currently stepping through. */ |
4027 | void | |
4028 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
4029 | { | |
4030 | struct thread_info *tp = inferior_thread (); | |
4031 | ||
16c381f0 JK |
4032 | tp->control.step_frame_id = get_frame_id (frame); |
4033 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4034 | |
4035 | tp->current_symtab = sal.symtab; | |
4036 | tp->current_line = sal.line; | |
4037 | } | |
4038 | ||
0d1e5fa7 PA |
4039 | /* Clear context switchable stepping state. */ |
4040 | ||
4041 | void | |
4e1c45ea | 4042 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4043 | { |
7f5ef605 | 4044 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4045 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4046 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4047 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4048 | } |
4049 | ||
ab1ddbcf | 4050 | /* See infrun.h. */ |
c32c64b7 | 4051 | |
6efcd9a8 | 4052 | void |
5b6d1e4f PA |
4053 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
4054 | target_waitstatus status) | |
c32c64b7 | 4055 | { |
5b6d1e4f | 4056 | target_last_proc_target = target; |
c32c64b7 DE |
4057 | target_last_wait_ptid = ptid; |
4058 | target_last_waitstatus = status; | |
4059 | } | |
4060 | ||
ab1ddbcf | 4061 | /* See infrun.h. */ |
e02bc4cc DS |
4062 | |
4063 | void | |
5b6d1e4f PA |
4064 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4065 | target_waitstatus *status) | |
e02bc4cc | 4066 | { |
5b6d1e4f PA |
4067 | if (target != nullptr) |
4068 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4069 | if (ptid != nullptr) |
4070 | *ptid = target_last_wait_ptid; | |
4071 | if (status != nullptr) | |
4072 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4073 | } |
4074 | ||
ab1ddbcf PA |
4075 | /* See infrun.h. */ |
4076 | ||
ac264b3b MS |
4077 | void |
4078 | nullify_last_target_wait_ptid (void) | |
4079 | { | |
5b6d1e4f | 4080 | target_last_proc_target = nullptr; |
ac264b3b | 4081 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4082 | target_last_waitstatus = {}; |
ac264b3b MS |
4083 | } |
4084 | ||
dcf4fbde | 4085 | /* Switch thread contexts. */ |
dd80620e MS |
4086 | |
4087 | static void | |
00431a78 | 4088 | context_switch (execution_control_state *ecs) |
dd80620e | 4089 | { |
00431a78 PA |
4090 | if (debug_infrun |
4091 | && ecs->ptid != inferior_ptid | |
5b6d1e4f PA |
4092 | && (inferior_ptid == null_ptid |
4093 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 DJ |
4094 | { |
4095 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
a068643d | 4096 | target_pid_to_str (inferior_ptid).c_str ()); |
fd48f117 | 4097 | fprintf_unfiltered (gdb_stdlog, "to %s\n", |
a068643d | 4098 | target_pid_to_str (ecs->ptid).c_str ()); |
fd48f117 DJ |
4099 | } |
4100 | ||
00431a78 | 4101 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4102 | } |
4103 | ||
d8dd4d5f PA |
4104 | /* If the target can't tell whether we've hit breakpoints |
4105 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4106 | check whether that could have been caused by a breakpoint. If so, | |
4107 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4108 | ||
4fa8626c | 4109 | static void |
d8dd4d5f PA |
4110 | adjust_pc_after_break (struct thread_info *thread, |
4111 | struct target_waitstatus *ws) | |
4fa8626c | 4112 | { |
24a73cce UW |
4113 | struct regcache *regcache; |
4114 | struct gdbarch *gdbarch; | |
118e6252 | 4115 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4116 | |
4fa8626c DJ |
4117 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4118 | we aren't, just return. | |
9709f61c DJ |
4119 | |
4120 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4121 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4122 | implemented by software breakpoints should be handled through the normal | |
4123 | breakpoint layer. | |
8fb3e588 | 4124 | |
4fa8626c DJ |
4125 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4126 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4127 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4128 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4129 | generates these signals at breakpoints (the code has been in GDB since at | |
4130 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4131 | |
e6cf7916 UW |
4132 | In earlier versions of GDB, a target with |
4133 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4134 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4135 | target with both of these set in GDB history, and it seems unlikely to be | |
4136 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4137 | |
d8dd4d5f | 4138 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4139 | return; |
4140 | ||
d8dd4d5f | 4141 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4142 | return; |
4143 | ||
4058b839 PA |
4144 | /* In reverse execution, when a breakpoint is hit, the instruction |
4145 | under it has already been de-executed. The reported PC always | |
4146 | points at the breakpoint address, so adjusting it further would | |
4147 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4148 | architecture: | |
4149 | ||
4150 | B1 0x08000000 : INSN1 | |
4151 | B2 0x08000001 : INSN2 | |
4152 | 0x08000002 : INSN3 | |
4153 | PC -> 0x08000003 : INSN4 | |
4154 | ||
4155 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4156 | from that point should hit B2 as below. Reading the PC when the | |
4157 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4158 | been de-executed already. | |
4159 | ||
4160 | B1 0x08000000 : INSN1 | |
4161 | B2 PC -> 0x08000001 : INSN2 | |
4162 | 0x08000002 : INSN3 | |
4163 | 0x08000003 : INSN4 | |
4164 | ||
4165 | We can't apply the same logic as for forward execution, because | |
4166 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4167 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4168 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4169 | behaviour. */ | |
4170 | if (execution_direction == EXEC_REVERSE) | |
4171 | return; | |
4172 | ||
1cf4d951 PA |
4173 | /* If the target can tell whether the thread hit a SW breakpoint, |
4174 | trust it. Targets that can tell also adjust the PC | |
4175 | themselves. */ | |
4176 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4177 | return; | |
4178 | ||
4179 | /* Note that relying on whether a breakpoint is planted in memory to | |
4180 | determine this can fail. E.g,. the breakpoint could have been | |
4181 | removed since. Or the thread could have been told to step an | |
4182 | instruction the size of a breakpoint instruction, and only | |
4183 | _after_ was a breakpoint inserted at its address. */ | |
4184 | ||
24a73cce UW |
4185 | /* If this target does not decrement the PC after breakpoints, then |
4186 | we have nothing to do. */ | |
00431a78 | 4187 | regcache = get_thread_regcache (thread); |
ac7936df | 4188 | gdbarch = regcache->arch (); |
118e6252 | 4189 | |
527a273a | 4190 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4191 | if (decr_pc == 0) |
24a73cce UW |
4192 | return; |
4193 | ||
8b86c959 | 4194 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4195 | |
8aad930b AC |
4196 | /* Find the location where (if we've hit a breakpoint) the |
4197 | breakpoint would be. */ | |
118e6252 | 4198 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4199 | |
1cf4d951 PA |
4200 | /* If the target can't tell whether a software breakpoint triggered, |
4201 | fallback to figuring it out based on breakpoints we think were | |
4202 | inserted in the target, and on whether the thread was stepped or | |
4203 | continued. */ | |
4204 | ||
1c5cfe86 PA |
4205 | /* Check whether there actually is a software breakpoint inserted at |
4206 | that location. | |
4207 | ||
4208 | If in non-stop mode, a race condition is possible where we've | |
4209 | removed a breakpoint, but stop events for that breakpoint were | |
4210 | already queued and arrive later. To suppress those spurious | |
4211 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4212 | and retire them after a number of stop events are reported. Note |
4213 | this is an heuristic and can thus get confused. The real fix is | |
4214 | to get the "stopped by SW BP and needs adjustment" info out of | |
4215 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4216 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4217 | || (target_is_non_stop_p () |
4218 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4219 | { |
07036511 | 4220 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4221 | |
8213266a | 4222 | if (record_full_is_used ()) |
07036511 TT |
4223 | restore_operation_disable.emplace |
4224 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4225 | |
1c0fdd0e UW |
4226 | /* When using hardware single-step, a SIGTRAP is reported for both |
4227 | a completed single-step and a software breakpoint. Need to | |
4228 | differentiate between the two, as the latter needs adjusting | |
4229 | but the former does not. | |
4230 | ||
4231 | The SIGTRAP can be due to a completed hardware single-step only if | |
4232 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4233 | - this thread is currently being stepped |
4234 | ||
4235 | If any of these events did not occur, we must have stopped due | |
4236 | to hitting a software breakpoint, and have to back up to the | |
4237 | breakpoint address. | |
4238 | ||
4239 | As a special case, we could have hardware single-stepped a | |
4240 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4241 | we also need to back up to the breakpoint address. */ | |
4242 | ||
d8dd4d5f PA |
4243 | if (thread_has_single_step_breakpoints_set (thread) |
4244 | || !currently_stepping (thread) | |
4245 | || (thread->stepped_breakpoint | |
4246 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4247 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4248 | } |
4fa8626c DJ |
4249 | } |
4250 | ||
edb3359d DJ |
4251 | static int |
4252 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4253 | { | |
4254 | for (frame = get_prev_frame (frame); | |
4255 | frame != NULL; | |
4256 | frame = get_prev_frame (frame)) | |
4257 | { | |
4258 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4259 | return 1; | |
4260 | if (get_frame_type (frame) != INLINE_FRAME) | |
4261 | break; | |
4262 | } | |
4263 | ||
4264 | return 0; | |
4265 | } | |
4266 | ||
4a4c04f1 BE |
4267 | /* Look for an inline frame that is marked for skip. |
4268 | If PREV_FRAME is TRUE start at the previous frame, | |
4269 | otherwise start at the current frame. Stop at the | |
4270 | first non-inline frame, or at the frame where the | |
4271 | step started. */ | |
4272 | ||
4273 | static bool | |
4274 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4275 | { | |
4276 | struct frame_info *frame = get_current_frame (); | |
4277 | ||
4278 | if (prev_frame) | |
4279 | frame = get_prev_frame (frame); | |
4280 | ||
4281 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4282 | { | |
4283 | const char *fn = NULL; | |
4284 | symtab_and_line sal; | |
4285 | struct symbol *sym; | |
4286 | ||
4287 | if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id)) | |
4288 | break; | |
4289 | if (get_frame_type (frame) != INLINE_FRAME) | |
4290 | break; | |
4291 | ||
4292 | sal = find_frame_sal (frame); | |
4293 | sym = get_frame_function (frame); | |
4294 | ||
4295 | if (sym != NULL) | |
4296 | fn = sym->print_name (); | |
4297 | ||
4298 | if (sal.line != 0 | |
4299 | && function_name_is_marked_for_skip (fn, sal)) | |
4300 | return true; | |
4301 | } | |
4302 | ||
4303 | return false; | |
4304 | } | |
4305 | ||
c65d6b55 PA |
4306 | /* If the event thread has the stop requested flag set, pretend it |
4307 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4308 | target_stop). */ | |
4309 | ||
4310 | static bool | |
4311 | handle_stop_requested (struct execution_control_state *ecs) | |
4312 | { | |
4313 | if (ecs->event_thread->stop_requested) | |
4314 | { | |
4315 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4316 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4317 | handle_signal_stop (ecs); | |
4318 | return true; | |
4319 | } | |
4320 | return false; | |
4321 | } | |
4322 | ||
a96d9b2e SDJ |
4323 | /* Auxiliary function that handles syscall entry/return events. |
4324 | It returns 1 if the inferior should keep going (and GDB | |
4325 | should ignore the event), or 0 if the event deserves to be | |
4326 | processed. */ | |
ca2163eb | 4327 | |
a96d9b2e | 4328 | static int |
ca2163eb | 4329 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4330 | { |
ca2163eb | 4331 | struct regcache *regcache; |
ca2163eb PA |
4332 | int syscall_number; |
4333 | ||
00431a78 | 4334 | context_switch (ecs); |
ca2163eb | 4335 | |
00431a78 | 4336 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4337 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4338 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4339 | |
a96d9b2e SDJ |
4340 | if (catch_syscall_enabled () > 0 |
4341 | && catching_syscall_number (syscall_number) > 0) | |
4342 | { | |
4343 | if (debug_infrun) | |
4344 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
4345 | syscall_number); | |
a96d9b2e | 4346 | |
16c381f0 | 4347 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4348 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4349 | ecs->event_thread->suspend.stop_pc, |
4350 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4351 | |
c65d6b55 PA |
4352 | if (handle_stop_requested (ecs)) |
4353 | return 0; | |
4354 | ||
ce12b012 | 4355 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4356 | { |
4357 | /* Catchpoint hit. */ | |
ca2163eb PA |
4358 | return 0; |
4359 | } | |
a96d9b2e | 4360 | } |
ca2163eb | 4361 | |
c65d6b55 PA |
4362 | if (handle_stop_requested (ecs)) |
4363 | return 0; | |
4364 | ||
ca2163eb | 4365 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb PA |
4366 | keep_going (ecs); |
4367 | return 1; | |
a96d9b2e SDJ |
4368 | } |
4369 | ||
7e324e48 GB |
4370 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4371 | ||
4372 | static void | |
4373 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4374 | struct execution_control_state *ecs) | |
4375 | { | |
4376 | if (!ecs->stop_func_filled_in) | |
4377 | { | |
98a617f8 KB |
4378 | const block *block; |
4379 | ||
7e324e48 GB |
4380 | /* Don't care about return value; stop_func_start and stop_func_name |
4381 | will both be 0 if it doesn't work. */ | |
98a617f8 KB |
4382 | find_pc_partial_function (ecs->event_thread->suspend.stop_pc, |
4383 | &ecs->stop_func_name, | |
4384 | &ecs->stop_func_start, | |
4385 | &ecs->stop_func_end, | |
4386 | &block); | |
4387 | ||
4388 | /* The call to find_pc_partial_function, above, will set | |
4389 | stop_func_start and stop_func_end to the start and end | |
4390 | of the range containing the stop pc. If this range | |
4391 | contains the entry pc for the block (which is always the | |
4392 | case for contiguous blocks), advance stop_func_start past | |
4393 | the function's start offset and entrypoint. Note that | |
4394 | stop_func_start is NOT advanced when in a range of a | |
4395 | non-contiguous block that does not contain the entry pc. */ | |
4396 | if (block != nullptr | |
4397 | && ecs->stop_func_start <= BLOCK_ENTRY_PC (block) | |
4398 | && BLOCK_ENTRY_PC (block) < ecs->stop_func_end) | |
4399 | { | |
4400 | ecs->stop_func_start | |
4401 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4402 | ||
4403 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4404 | ecs->stop_func_start | |
4405 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4406 | } | |
591a12a1 | 4407 | |
7e324e48 GB |
4408 | ecs->stop_func_filled_in = 1; |
4409 | } | |
4410 | } | |
4411 | ||
4f5d7f63 | 4412 | |
00431a78 | 4413 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4414 | |
4415 | static enum stop_kind | |
00431a78 | 4416 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4417 | { |
5b6d1e4f | 4418 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4419 | |
4420 | gdb_assert (inf != NULL); | |
4421 | return inf->control.stop_soon; | |
4422 | } | |
4423 | ||
5b6d1e4f PA |
4424 | /* Poll for one event out of the current target. Store the resulting |
4425 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4426 | |
4427 | static ptid_t | |
5b6d1e4f | 4428 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4429 | { |
4430 | ptid_t event_ptid; | |
372316f1 PA |
4431 | |
4432 | overlay_cache_invalid = 1; | |
4433 | ||
4434 | /* Flush target cache before starting to handle each event. | |
4435 | Target was running and cache could be stale. This is just a | |
4436 | heuristic. Running threads may modify target memory, but we | |
4437 | don't get any event. */ | |
4438 | target_dcache_invalidate (); | |
4439 | ||
4440 | if (deprecated_target_wait_hook) | |
5b6d1e4f | 4441 | event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 | 4442 | else |
5b6d1e4f | 4443 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4444 | |
4445 | if (debug_infrun) | |
5b6d1e4f | 4446 | print_target_wait_results (minus_one_ptid, event_ptid, ws); |
372316f1 PA |
4447 | |
4448 | return event_ptid; | |
4449 | } | |
4450 | ||
5b6d1e4f PA |
4451 | /* An event reported by wait_one. */ |
4452 | ||
4453 | struct wait_one_event | |
4454 | { | |
4455 | /* The target the event came out of. */ | |
4456 | process_stratum_target *target; | |
4457 | ||
4458 | /* The PTID the event was for. */ | |
4459 | ptid_t ptid; | |
4460 | ||
4461 | /* The waitstatus. */ | |
4462 | target_waitstatus ws; | |
4463 | }; | |
4464 | ||
4465 | /* Wait for one event out of any target. */ | |
4466 | ||
4467 | static wait_one_event | |
4468 | wait_one () | |
4469 | { | |
4470 | while (1) | |
4471 | { | |
4472 | for (inferior *inf : all_inferiors ()) | |
4473 | { | |
4474 | process_stratum_target *target = inf->process_target (); | |
4475 | if (target == NULL | |
4476 | || !target->is_async_p () | |
4477 | || !target->threads_executing) | |
4478 | continue; | |
4479 | ||
4480 | switch_to_inferior_no_thread (inf); | |
4481 | ||
4482 | wait_one_event event; | |
4483 | event.target = target; | |
4484 | event.ptid = poll_one_curr_target (&event.ws); | |
4485 | ||
4486 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4487 | { | |
4488 | /* If nothing is resumed, remove the target from the | |
4489 | event loop. */ | |
4490 | target_async (0); | |
4491 | } | |
4492 | else if (event.ws.kind != TARGET_WAITKIND_IGNORE) | |
4493 | return event; | |
4494 | } | |
4495 | ||
4496 | /* Block waiting for some event. */ | |
4497 | ||
4498 | fd_set readfds; | |
4499 | int nfds = 0; | |
4500 | ||
4501 | FD_ZERO (&readfds); | |
4502 | ||
4503 | for (inferior *inf : all_inferiors ()) | |
4504 | { | |
4505 | process_stratum_target *target = inf->process_target (); | |
4506 | if (target == NULL | |
4507 | || !target->is_async_p () | |
4508 | || !target->threads_executing) | |
4509 | continue; | |
4510 | ||
4511 | int fd = target->async_wait_fd (); | |
4512 | FD_SET (fd, &readfds); | |
4513 | if (nfds <= fd) | |
4514 | nfds = fd + 1; | |
4515 | } | |
4516 | ||
4517 | if (nfds == 0) | |
4518 | { | |
4519 | /* No waitable targets left. All must be stopped. */ | |
4520 | return {NULL, minus_one_ptid, {TARGET_WAITKIND_NO_RESUMED}}; | |
4521 | } | |
4522 | ||
4523 | QUIT; | |
4524 | ||
4525 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4526 | if (numfds < 0) | |
4527 | { | |
4528 | if (errno == EINTR) | |
4529 | continue; | |
4530 | else | |
4531 | perror_with_name ("interruptible_select"); | |
4532 | } | |
4533 | } | |
4534 | } | |
4535 | ||
372316f1 PA |
4536 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID |
4537 | instead of the current thread. */ | |
4538 | #define THREAD_STOPPED_BY(REASON) \ | |
4539 | static int \ | |
4540 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4541 | { \ | |
2989a365 | 4542 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); \ |
372316f1 PA |
4543 | inferior_ptid = ptid; \ |
4544 | \ | |
2989a365 | 4545 | return target_stopped_by_ ## REASON (); \ |
372316f1 PA |
4546 | } |
4547 | ||
4548 | /* Generate thread_stopped_by_watchpoint. */ | |
4549 | THREAD_STOPPED_BY (watchpoint) | |
4550 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4551 | THREAD_STOPPED_BY (sw_breakpoint) | |
4552 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4553 | THREAD_STOPPED_BY (hw_breakpoint) | |
4554 | ||
372316f1 PA |
4555 | /* Save the thread's event and stop reason to process it later. */ |
4556 | ||
4557 | static void | |
5b6d1e4f | 4558 | save_waitstatus (struct thread_info *tp, const target_waitstatus *ws) |
372316f1 | 4559 | { |
372316f1 PA |
4560 | if (debug_infrun) |
4561 | { | |
23fdd69e | 4562 | std::string statstr = target_waitstatus_to_string (ws); |
372316f1 | 4563 | |
372316f1 PA |
4564 | fprintf_unfiltered (gdb_stdlog, |
4565 | "infrun: saving status %s for %d.%ld.%ld\n", | |
23fdd69e | 4566 | statstr.c_str (), |
e99b03dc | 4567 | tp->ptid.pid (), |
e38504b3 | 4568 | tp->ptid.lwp (), |
cc6bcb54 | 4569 | tp->ptid.tid ()); |
372316f1 PA |
4570 | } |
4571 | ||
4572 | /* Record for later. */ | |
4573 | tp->suspend.waitstatus = *ws; | |
4574 | tp->suspend.waitstatus_pending_p = 1; | |
4575 | ||
00431a78 | 4576 | struct regcache *regcache = get_thread_regcache (tp); |
8b86c959 | 4577 | const address_space *aspace = regcache->aspace (); |
372316f1 PA |
4578 | |
4579 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4580 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4581 | { | |
4582 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4583 | ||
4584 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4585 | ||
4586 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4587 | { | |
4588 | tp->suspend.stop_reason | |
4589 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4590 | } | |
4591 | else if (target_supports_stopped_by_sw_breakpoint () | |
4592 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4593 | { | |
4594 | tp->suspend.stop_reason | |
4595 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4596 | } | |
4597 | else if (target_supports_stopped_by_hw_breakpoint () | |
4598 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4599 | { | |
4600 | tp->suspend.stop_reason | |
4601 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4602 | } | |
4603 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4604 | && hardware_breakpoint_inserted_here_p (aspace, | |
4605 | pc)) | |
4606 | { | |
4607 | tp->suspend.stop_reason | |
4608 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4609 | } | |
4610 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4611 | && software_breakpoint_inserted_here_p (aspace, | |
4612 | pc)) | |
4613 | { | |
4614 | tp->suspend.stop_reason | |
4615 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4616 | } | |
4617 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4618 | && currently_stepping (tp)) | |
4619 | { | |
4620 | tp->suspend.stop_reason | |
4621 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4622 | } | |
4623 | } | |
4624 | } | |
4625 | ||
6efcd9a8 | 4626 | /* See infrun.h. */ |
372316f1 | 4627 | |
6efcd9a8 | 4628 | void |
372316f1 PA |
4629 | stop_all_threads (void) |
4630 | { | |
4631 | /* We may need multiple passes to discover all threads. */ | |
4632 | int pass; | |
4633 | int iterations = 0; | |
372316f1 | 4634 | |
fbea99ea | 4635 | gdb_assert (target_is_non_stop_p ()); |
372316f1 PA |
4636 | |
4637 | if (debug_infrun) | |
4638 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n"); | |
4639 | ||
00431a78 | 4640 | scoped_restore_current_thread restore_thread; |
372316f1 | 4641 | |
65706a29 | 4642 | target_thread_events (1); |
9885e6bb | 4643 | SCOPE_EXIT { target_thread_events (0); }; |
65706a29 | 4644 | |
372316f1 PA |
4645 | /* Request threads to stop, and then wait for the stops. Because |
4646 | threads we already know about can spawn more threads while we're | |
4647 | trying to stop them, and we only learn about new threads when we | |
4648 | update the thread list, do this in a loop, and keep iterating | |
4649 | until two passes find no threads that need to be stopped. */ | |
4650 | for (pass = 0; pass < 2; pass++, iterations++) | |
4651 | { | |
4652 | if (debug_infrun) | |
4653 | fprintf_unfiltered (gdb_stdlog, | |
4654 | "infrun: stop_all_threads, pass=%d, " | |
4655 | "iterations=%d\n", pass, iterations); | |
4656 | while (1) | |
4657 | { | |
372316f1 | 4658 | int need_wait = 0; |
372316f1 PA |
4659 | |
4660 | update_thread_list (); | |
4661 | ||
4662 | /* Go through all threads looking for threads that we need | |
4663 | to tell the target to stop. */ | |
08036331 | 4664 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 PA |
4665 | { |
4666 | if (t->executing) | |
4667 | { | |
4668 | /* If already stopping, don't request a stop again. | |
4669 | We just haven't seen the notification yet. */ | |
4670 | if (!t->stop_requested) | |
4671 | { | |
4672 | if (debug_infrun) | |
4673 | fprintf_unfiltered (gdb_stdlog, | |
4674 | "infrun: %s executing, " | |
4675 | "need stop\n", | |
a068643d | 4676 | target_pid_to_str (t->ptid).c_str ()); |
f3f8ece4 | 4677 | switch_to_thread_no_regs (t); |
372316f1 PA |
4678 | target_stop (t->ptid); |
4679 | t->stop_requested = 1; | |
4680 | } | |
4681 | else | |
4682 | { | |
4683 | if (debug_infrun) | |
4684 | fprintf_unfiltered (gdb_stdlog, | |
4685 | "infrun: %s executing, " | |
4686 | "already stopping\n", | |
a068643d | 4687 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4688 | } |
4689 | ||
4690 | if (t->stop_requested) | |
4691 | need_wait = 1; | |
4692 | } | |
4693 | else | |
4694 | { | |
4695 | if (debug_infrun) | |
4696 | fprintf_unfiltered (gdb_stdlog, | |
4697 | "infrun: %s not executing\n", | |
a068643d | 4698 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4699 | |
4700 | /* The thread may be not executing, but still be | |
4701 | resumed with a pending status to process. */ | |
4702 | t->resumed = 0; | |
4703 | } | |
4704 | } | |
4705 | ||
4706 | if (!need_wait) | |
4707 | break; | |
4708 | ||
4709 | /* If we find new threads on the second iteration, restart | |
4710 | over. We want to see two iterations in a row with all | |
4711 | threads stopped. */ | |
4712 | if (pass > 0) | |
4713 | pass = -1; | |
4714 | ||
5b6d1e4f PA |
4715 | wait_one_event event = wait_one (); |
4716 | ||
c29705b7 | 4717 | if (debug_infrun) |
372316f1 | 4718 | { |
c29705b7 PW |
4719 | fprintf_unfiltered (gdb_stdlog, |
4720 | "infrun: stop_all_threads %s %s\n", | |
5b6d1e4f PA |
4721 | target_waitstatus_to_string (&event.ws).c_str (), |
4722 | target_pid_to_str (event.ptid).c_str ()); | |
372316f1 | 4723 | } |
372316f1 | 4724 | |
5b6d1e4f PA |
4725 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED |
4726 | || event.ws.kind == TARGET_WAITKIND_THREAD_EXITED | |
4727 | || event.ws.kind == TARGET_WAITKIND_EXITED | |
4728 | || event.ws.kind == TARGET_WAITKIND_SIGNALLED) | |
c29705b7 PW |
4729 | { |
4730 | /* All resumed threads exited | |
4731 | or one thread/process exited/signalled. */ | |
372316f1 PA |
4732 | } |
4733 | else | |
4734 | { | |
5b6d1e4f | 4735 | thread_info *t = find_thread_ptid (event.target, event.ptid); |
372316f1 | 4736 | if (t == NULL) |
5b6d1e4f | 4737 | t = add_thread (event.target, event.ptid); |
372316f1 PA |
4738 | |
4739 | t->stop_requested = 0; | |
4740 | t->executing = 0; | |
4741 | t->resumed = 0; | |
4742 | t->control.may_range_step = 0; | |
4743 | ||
6efcd9a8 PA |
4744 | /* This may be the first time we see the inferior report |
4745 | a stop. */ | |
5b6d1e4f | 4746 | inferior *inf = find_inferior_ptid (event.target, event.ptid); |
6efcd9a8 PA |
4747 | if (inf->needs_setup) |
4748 | { | |
4749 | switch_to_thread_no_regs (t); | |
4750 | setup_inferior (0); | |
4751 | } | |
4752 | ||
5b6d1e4f PA |
4753 | if (event.ws.kind == TARGET_WAITKIND_STOPPED |
4754 | && event.ws.value.sig == GDB_SIGNAL_0) | |
372316f1 PA |
4755 | { |
4756 | /* We caught the event that we intended to catch, so | |
4757 | there's no event pending. */ | |
4758 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4759 | t->suspend.waitstatus_pending_p = 0; | |
4760 | ||
00431a78 | 4761 | if (displaced_step_fixup (t, GDB_SIGNAL_0) < 0) |
372316f1 PA |
4762 | { |
4763 | /* Add it back to the step-over queue. */ | |
4764 | if (debug_infrun) | |
4765 | { | |
4766 | fprintf_unfiltered (gdb_stdlog, | |
4767 | "infrun: displaced-step of %s " | |
4768 | "canceled: adding back to the " | |
4769 | "step-over queue\n", | |
a068643d | 4770 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4771 | } |
4772 | t->control.trap_expected = 0; | |
4773 | thread_step_over_chain_enqueue (t); | |
4774 | } | |
4775 | } | |
4776 | else | |
4777 | { | |
4778 | enum gdb_signal sig; | |
4779 | struct regcache *regcache; | |
372316f1 PA |
4780 | |
4781 | if (debug_infrun) | |
4782 | { | |
5b6d1e4f | 4783 | std::string statstr = target_waitstatus_to_string (&event.ws); |
372316f1 | 4784 | |
372316f1 PA |
4785 | fprintf_unfiltered (gdb_stdlog, |
4786 | "infrun: target_wait %s, saving " | |
4787 | "status for %d.%ld.%ld\n", | |
23fdd69e | 4788 | statstr.c_str (), |
e99b03dc | 4789 | t->ptid.pid (), |
e38504b3 | 4790 | t->ptid.lwp (), |
cc6bcb54 | 4791 | t->ptid.tid ()); |
372316f1 PA |
4792 | } |
4793 | ||
4794 | /* Record for later. */ | |
5b6d1e4f | 4795 | save_waitstatus (t, &event.ws); |
372316f1 | 4796 | |
5b6d1e4f PA |
4797 | sig = (event.ws.kind == TARGET_WAITKIND_STOPPED |
4798 | ? event.ws.value.sig : GDB_SIGNAL_0); | |
372316f1 | 4799 | |
00431a78 | 4800 | if (displaced_step_fixup (t, sig) < 0) |
372316f1 PA |
4801 | { |
4802 | /* Add it back to the step-over queue. */ | |
4803 | t->control.trap_expected = 0; | |
4804 | thread_step_over_chain_enqueue (t); | |
4805 | } | |
4806 | ||
00431a78 | 4807 | regcache = get_thread_regcache (t); |
372316f1 PA |
4808 | t->suspend.stop_pc = regcache_read_pc (regcache); |
4809 | ||
4810 | if (debug_infrun) | |
4811 | { | |
4812 | fprintf_unfiltered (gdb_stdlog, | |
4813 | "infrun: saved stop_pc=%s for %s " | |
4814 | "(currently_stepping=%d)\n", | |
4815 | paddress (target_gdbarch (), | |
4816 | t->suspend.stop_pc), | |
a068643d | 4817 | target_pid_to_str (t->ptid).c_str (), |
372316f1 PA |
4818 | currently_stepping (t)); |
4819 | } | |
4820 | } | |
4821 | } | |
4822 | } | |
4823 | } | |
4824 | ||
372316f1 PA |
4825 | if (debug_infrun) |
4826 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n"); | |
4827 | } | |
4828 | ||
f4836ba9 PA |
4829 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4830 | ||
4831 | static int | |
4832 | handle_no_resumed (struct execution_control_state *ecs) | |
4833 | { | |
3b12939d | 4834 | if (target_can_async_p ()) |
f4836ba9 | 4835 | { |
3b12939d PA |
4836 | struct ui *ui; |
4837 | int any_sync = 0; | |
f4836ba9 | 4838 | |
3b12939d PA |
4839 | ALL_UIS (ui) |
4840 | { | |
4841 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4842 | { | |
4843 | any_sync = 1; | |
4844 | break; | |
4845 | } | |
4846 | } | |
4847 | if (!any_sync) | |
4848 | { | |
4849 | /* There were no unwaited-for children left in the target, but, | |
4850 | we're not synchronously waiting for events either. Just | |
4851 | ignore. */ | |
4852 | ||
4853 | if (debug_infrun) | |
4854 | fprintf_unfiltered (gdb_stdlog, | |
4855 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4856 | "(ignoring: bg)\n"); | |
4857 | prepare_to_wait (ecs); | |
4858 | return 1; | |
4859 | } | |
f4836ba9 PA |
4860 | } |
4861 | ||
4862 | /* Otherwise, if we were running a synchronous execution command, we | |
4863 | may need to cancel it and give the user back the terminal. | |
4864 | ||
4865 | In non-stop mode, the target can't tell whether we've already | |
4866 | consumed previous stop events, so it can end up sending us a | |
4867 | no-resumed event like so: | |
4868 | ||
4869 | #0 - thread 1 is left stopped | |
4870 | ||
4871 | #1 - thread 2 is resumed and hits breakpoint | |
4872 | -> TARGET_WAITKIND_STOPPED | |
4873 | ||
4874 | #2 - thread 3 is resumed and exits | |
4875 | this is the last resumed thread, so | |
4876 | -> TARGET_WAITKIND_NO_RESUMED | |
4877 | ||
4878 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4879 | it. | |
4880 | ||
4881 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4882 | thread 2 is now resumed, so the event should be ignored. | |
4883 | ||
4884 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4885 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4886 | event. But it could be that the event meant that thread 2 itself | |
4887 | (or whatever other thread was the last resumed thread) exited. | |
4888 | ||
4889 | To address this we refresh the thread list and check whether we | |
4890 | have resumed threads _now_. In the example above, this removes | |
4891 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4892 | ignore this event. If we find no thread resumed, then we cancel | |
4893 | the synchronous command show "no unwaited-for " to the user. */ | |
4894 | update_thread_list (); | |
4895 | ||
5b6d1e4f | 4896 | for (thread_info *thread : all_non_exited_threads (ecs->target)) |
f4836ba9 PA |
4897 | { |
4898 | if (thread->executing | |
4899 | || thread->suspend.waitstatus_pending_p) | |
4900 | { | |
4901 | /* There were no unwaited-for children left in the target at | |
4902 | some point, but there are now. Just ignore. */ | |
4903 | if (debug_infrun) | |
4904 | fprintf_unfiltered (gdb_stdlog, | |
4905 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4906 | "(ignoring: found resumed)\n"); | |
4907 | prepare_to_wait (ecs); | |
4908 | return 1; | |
4909 | } | |
4910 | } | |
4911 | ||
4912 | /* Note however that we may find no resumed thread because the whole | |
4913 | process exited meanwhile (thus updating the thread list results | |
4914 | in an empty thread list). In this case we know we'll be getting | |
4915 | a process exit event shortly. */ | |
5b6d1e4f | 4916 | for (inferior *inf : all_non_exited_inferiors (ecs->target)) |
f4836ba9 | 4917 | { |
08036331 | 4918 | thread_info *thread = any_live_thread_of_inferior (inf); |
f4836ba9 PA |
4919 | if (thread == NULL) |
4920 | { | |
4921 | if (debug_infrun) | |
4922 | fprintf_unfiltered (gdb_stdlog, | |
4923 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4924 | "(expect process exit)\n"); | |
4925 | prepare_to_wait (ecs); | |
4926 | return 1; | |
4927 | } | |
4928 | } | |
4929 | ||
4930 | /* Go ahead and report the event. */ | |
4931 | return 0; | |
4932 | } | |
4933 | ||
05ba8510 PA |
4934 | /* Given an execution control state that has been freshly filled in by |
4935 | an event from the inferior, figure out what it means and take | |
4936 | appropriate action. | |
4937 | ||
4938 | The alternatives are: | |
4939 | ||
22bcd14b | 4940 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
4941 | debugger. |
4942 | ||
4943 | 2) keep_going and return; to wait for the next event (set | |
4944 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
4945 | once). */ | |
c906108c | 4946 | |
ec9499be | 4947 | static void |
595915c1 | 4948 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 4949 | { |
595915c1 TT |
4950 | /* Make sure that all temporary struct value objects that were |
4951 | created during the handling of the event get deleted at the | |
4952 | end. */ | |
4953 | scoped_value_mark free_values; | |
4954 | ||
d6b48e9c PA |
4955 | enum stop_kind stop_soon; |
4956 | ||
c29705b7 PW |
4957 | if (debug_infrun) |
4958 | fprintf_unfiltered (gdb_stdlog, "infrun: handle_inferior_event %s\n", | |
4959 | target_waitstatus_to_string (&ecs->ws).c_str ()); | |
4960 | ||
28736962 PA |
4961 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
4962 | { | |
4963 | /* We had an event in the inferior, but we are not interested in | |
4964 | handling it at this level. The lower layers have already | |
4965 | done what needs to be done, if anything. | |
4966 | ||
4967 | One of the possible circumstances for this is when the | |
4968 | inferior produces output for the console. The inferior has | |
4969 | not stopped, and we are ignoring the event. Another possible | |
4970 | circumstance is any event which the lower level knows will be | |
4971 | reported multiple times without an intervening resume. */ | |
28736962 PA |
4972 | prepare_to_wait (ecs); |
4973 | return; | |
4974 | } | |
4975 | ||
65706a29 PA |
4976 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
4977 | { | |
65706a29 PA |
4978 | prepare_to_wait (ecs); |
4979 | return; | |
4980 | } | |
4981 | ||
0e5bf2a8 | 4982 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
4983 | && handle_no_resumed (ecs)) |
4984 | return; | |
0e5bf2a8 | 4985 | |
5b6d1e4f PA |
4986 | /* Cache the last target/ptid/waitstatus. */ |
4987 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 4988 | |
ca005067 | 4989 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 4990 | stop_stack_dummy = STOP_NONE; |
ca005067 | 4991 | |
0e5bf2a8 PA |
4992 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
4993 | { | |
4994 | /* No unwaited-for children left. IOW, all resumed children | |
4995 | have exited. */ | |
0e5bf2a8 | 4996 | stop_print_frame = 0; |
22bcd14b | 4997 | stop_waiting (ecs); |
0e5bf2a8 PA |
4998 | return; |
4999 | } | |
5000 | ||
8c90c137 | 5001 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 5002 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 | 5003 | { |
5b6d1e4f | 5004 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5005 | /* If it's a new thread, add it to the thread database. */ |
5006 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5007 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5008 | |
5009 | /* Disable range stepping. If the next step request could use a | |
5010 | range, this will be end up re-enabled then. */ | |
5011 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5012 | } |
88ed393a JK |
5013 | |
5014 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 5015 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
5016 | |
5017 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5018 | reinit_frame_cache (); | |
5019 | ||
28736962 PA |
5020 | breakpoint_retire_moribund (); |
5021 | ||
2b009048 DJ |
5022 | /* First, distinguish signals caused by the debugger from signals |
5023 | that have to do with the program's own actions. Note that | |
5024 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5025 | on the operating system version. Here we detect when a SIGILL or | |
5026 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5027 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5028 | when we're trying to execute a breakpoint instruction on a | |
5029 | non-executable stack. This happens for call dummy breakpoints | |
5030 | for architectures like SPARC that place call dummies on the | |
5031 | stack. */ | |
2b009048 | 5032 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
5033 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
5034 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
5035 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 5036 | { |
00431a78 | 5037 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5038 | |
a01bda52 | 5039 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5040 | regcache_read_pc (regcache))) |
5041 | { | |
5042 | if (debug_infrun) | |
5043 | fprintf_unfiltered (gdb_stdlog, | |
5044 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 5045 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 5046 | } |
2b009048 DJ |
5047 | } |
5048 | ||
28736962 PA |
5049 | /* Mark the non-executing threads accordingly. In all-stop, all |
5050 | threads of all processes are stopped when we get any event | |
e1316e60 | 5051 | reported. In non-stop mode, only the event thread stops. */ |
372316f1 PA |
5052 | { |
5053 | ptid_t mark_ptid; | |
5054 | ||
fbea99ea | 5055 | if (!target_is_non_stop_p ()) |
372316f1 PA |
5056 | mark_ptid = minus_one_ptid; |
5057 | else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED | |
5058 | || ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
5059 | { | |
5060 | /* If we're handling a process exit in non-stop mode, even | |
5061 | though threads haven't been deleted yet, one would think | |
5062 | that there is nothing to do, as threads of the dead process | |
5063 | will be soon deleted, and threads of any other process were | |
5064 | left running. However, on some targets, threads survive a | |
5065 | process exit event. E.g., for the "checkpoint" command, | |
5066 | when the current checkpoint/fork exits, linux-fork.c | |
5067 | automatically switches to another fork from within | |
5068 | target_mourn_inferior, by associating the same | |
5069 | inferior/thread to another fork. We haven't mourned yet at | |
5070 | this point, but we must mark any threads left in the | |
5071 | process as not-executing so that finish_thread_state marks | |
5072 | them stopped (in the user's perspective) if/when we present | |
5073 | the stop to the user. */ | |
e99b03dc | 5074 | mark_ptid = ptid_t (ecs->ptid.pid ()); |
372316f1 PA |
5075 | } |
5076 | else | |
5077 | mark_ptid = ecs->ptid; | |
5078 | ||
5b6d1e4f | 5079 | set_executing (ecs->target, mark_ptid, 0); |
372316f1 PA |
5080 | |
5081 | /* Likewise the resumed flag. */ | |
5b6d1e4f | 5082 | set_resumed (ecs->target, mark_ptid, 0); |
372316f1 | 5083 | } |
8c90c137 | 5084 | |
488f131b JB |
5085 | switch (ecs->ws.kind) |
5086 | { | |
5087 | case TARGET_WAITKIND_LOADED: | |
00431a78 | 5088 | context_switch (ecs); |
b0f4b84b DJ |
5089 | /* Ignore gracefully during startup of the inferior, as it might |
5090 | be the shell which has just loaded some objects, otherwise | |
5091 | add the symbols for the newly loaded objects. Also ignore at | |
5092 | the beginning of an attach or remote session; we will query | |
5093 | the full list of libraries once the connection is | |
5094 | established. */ | |
4f5d7f63 | 5095 | |
00431a78 | 5096 | stop_soon = get_inferior_stop_soon (ecs); |
c0236d92 | 5097 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 5098 | { |
edcc5120 TT |
5099 | struct regcache *regcache; |
5100 | ||
00431a78 | 5101 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 TT |
5102 | |
5103 | handle_solib_event (); | |
5104 | ||
5105 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 5106 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
5107 | ecs->event_thread->suspend.stop_pc, |
5108 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 5109 | |
c65d6b55 PA |
5110 | if (handle_stop_requested (ecs)) |
5111 | return; | |
5112 | ||
ce12b012 | 5113 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
5114 | { |
5115 | /* A catchpoint triggered. */ | |
94c57d6a PA |
5116 | process_event_stop_test (ecs); |
5117 | return; | |
edcc5120 | 5118 | } |
488f131b | 5119 | |
b0f4b84b DJ |
5120 | /* If requested, stop when the dynamic linker notifies |
5121 | gdb of events. This allows the user to get control | |
5122 | and place breakpoints in initializer routines for | |
5123 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 5124 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
5125 | if (stop_on_solib_events) |
5126 | { | |
55409f9d DJ |
5127 | /* Make sure we print "Stopped due to solib-event" in |
5128 | normal_stop. */ | |
5129 | stop_print_frame = 1; | |
5130 | ||
22bcd14b | 5131 | stop_waiting (ecs); |
b0f4b84b DJ |
5132 | return; |
5133 | } | |
488f131b | 5134 | } |
b0f4b84b DJ |
5135 | |
5136 | /* If we are skipping through a shell, or through shared library | |
5137 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 5138 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
5139 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
5140 | { | |
74960c60 VP |
5141 | /* Loading of shared libraries might have changed breakpoint |
5142 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 5143 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 5144 | insert_breakpoints (); |
64ce06e4 | 5145 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
5146 | prepare_to_wait (ecs); |
5147 | return; | |
5148 | } | |
5149 | ||
5c09a2c5 PA |
5150 | /* But stop if we're attaching or setting up a remote |
5151 | connection. */ | |
5152 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5153 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5154 | { | |
5155 | if (debug_infrun) | |
5156 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 5157 | stop_waiting (ecs); |
5c09a2c5 PA |
5158 | return; |
5159 | } | |
5160 | ||
5161 | internal_error (__FILE__, __LINE__, | |
5162 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 5163 | |
488f131b | 5164 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5165 | if (handle_stop_requested (ecs)) |
5166 | return; | |
00431a78 | 5167 | context_switch (ecs); |
64ce06e4 | 5168 | resume (GDB_SIGNAL_0); |
488f131b JB |
5169 | prepare_to_wait (ecs); |
5170 | return; | |
c5aa993b | 5171 | |
65706a29 | 5172 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5173 | if (handle_stop_requested (ecs)) |
5174 | return; | |
00431a78 | 5175 | context_switch (ecs); |
65706a29 PA |
5176 | if (!switch_back_to_stepped_thread (ecs)) |
5177 | keep_going (ecs); | |
5178 | return; | |
5179 | ||
488f131b | 5180 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5181 | case TARGET_WAITKIND_SIGNALLED: |
fb66883a | 5182 | inferior_ptid = ecs->ptid; |
5b6d1e4f | 5183 | set_current_inferior (find_inferior_ptid (ecs->target, ecs->ptid)); |
6c95b8df PA |
5184 | set_current_program_space (current_inferior ()->pspace); |
5185 | handle_vfork_child_exec_or_exit (0); | |
223ffa71 | 5186 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5187 | |
0c557179 SDJ |
5188 | /* Clearing any previous state of convenience variables. */ |
5189 | clear_exit_convenience_vars (); | |
5190 | ||
940c3c06 PA |
5191 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5192 | { | |
5193 | /* Record the exit code in the convenience variable $_exitcode, so | |
5194 | that the user can inspect this again later. */ | |
5195 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5196 | (LONGEST) ecs->ws.value.integer); | |
5197 | ||
5198 | /* Also record this in the inferior itself. */ | |
5199 | current_inferior ()->has_exit_code = 1; | |
5200 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5201 | |
98eb56a4 PA |
5202 | /* Support the --return-child-result option. */ |
5203 | return_child_result_value = ecs->ws.value.integer; | |
5204 | ||
76727919 | 5205 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
5206 | } |
5207 | else | |
0c557179 | 5208 | { |
00431a78 | 5209 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5210 | |
5211 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5212 | { | |
5213 | /* Set the value of the internal variable $_exitsignal, | |
5214 | which holds the signal uncaught by the inferior. */ | |
5215 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5216 | gdbarch_gdb_signal_to_target (gdbarch, | |
5217 | ecs->ws.value.sig)); | |
5218 | } | |
5219 | else | |
5220 | { | |
5221 | /* We don't have access to the target's method used for | |
5222 | converting between signal numbers (GDB's internal | |
5223 | representation <-> target's representation). | |
5224 | Therefore, we cannot do a good job at displaying this | |
5225 | information to the user. It's better to just warn | |
5226 | her about it (if infrun debugging is enabled), and | |
5227 | give up. */ | |
5228 | if (debug_infrun) | |
5229 | fprintf_filtered (gdb_stdlog, _("\ | |
5230 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
5231 | } | |
5232 | ||
76727919 | 5233 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 5234 | } |
8cf64490 | 5235 | |
488f131b | 5236 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5237 | target_mourn_inferior (inferior_ptid); |
488f131b | 5238 | stop_print_frame = 0; |
22bcd14b | 5239 | stop_waiting (ecs); |
488f131b | 5240 | return; |
c5aa993b | 5241 | |
488f131b | 5242 | /* The following are the only cases in which we keep going; |
1777feb0 | 5243 | the above cases end in a continue or goto. */ |
488f131b | 5244 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5245 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5246 | /* Check whether the inferior is displaced stepping. */ |
5247 | { | |
00431a78 | 5248 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5249 | struct gdbarch *gdbarch = regcache->arch (); |
e2d96639 YQ |
5250 | |
5251 | /* If checking displaced stepping is supported, and thread | |
5252 | ecs->ptid is displaced stepping. */ | |
00431a78 | 5253 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 YQ |
5254 | { |
5255 | struct inferior *parent_inf | |
5b6d1e4f | 5256 | = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 YQ |
5257 | struct regcache *child_regcache; |
5258 | CORE_ADDR parent_pc; | |
5259 | ||
5260 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
5261 | indicating that the displaced stepping of syscall instruction | |
5262 | has been done. Perform cleanup for parent process here. Note | |
5263 | that this operation also cleans up the child process for vfork, | |
5264 | because their pages are shared. */ | |
00431a78 | 5265 | displaced_step_fixup (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5266 | /* Start a new step-over in another thread if there's one |
5267 | that needs it. */ | |
5268 | start_step_over (); | |
e2d96639 YQ |
5269 | |
5270 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
5271 | { | |
c0987663 | 5272 | struct displaced_step_inferior_state *displaced |
00431a78 | 5273 | = get_displaced_stepping_state (parent_inf); |
c0987663 | 5274 | |
e2d96639 YQ |
5275 | /* Restore scratch pad for child process. */ |
5276 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
5277 | } | |
5278 | ||
5279 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
5280 | the child's PC is also within the scratchpad. Set the child's PC | |
5281 | to the parent's PC value, which has already been fixed up. | |
5282 | FIXME: we use the parent's aspace here, although we're touching | |
5283 | the child, because the child hasn't been added to the inferior | |
5284 | list yet at this point. */ | |
5285 | ||
5286 | child_regcache | |
5b6d1e4f PA |
5287 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
5288 | ecs->ws.value.related_pid, | |
e2d96639 YQ |
5289 | gdbarch, |
5290 | parent_inf->aspace); | |
5291 | /* Read PC value of parent process. */ | |
5292 | parent_pc = regcache_read_pc (regcache); | |
5293 | ||
5294 | if (debug_displaced) | |
5295 | fprintf_unfiltered (gdb_stdlog, | |
5296 | "displaced: write child pc from %s to %s\n", | |
5297 | paddress (gdbarch, | |
5298 | regcache_read_pc (child_regcache)), | |
5299 | paddress (gdbarch, parent_pc)); | |
5300 | ||
5301 | regcache_write_pc (child_regcache, parent_pc); | |
5302 | } | |
5303 | } | |
5304 | ||
00431a78 | 5305 | context_switch (ecs); |
5a2901d9 | 5306 | |
b242c3c2 PA |
5307 | /* Immediately detach breakpoints from the child before there's |
5308 | any chance of letting the user delete breakpoints from the | |
5309 | breakpoint lists. If we don't do this early, it's easy to | |
5310 | leave left over traps in the child, vis: "break foo; catch | |
5311 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5312 | the fork on the last `continue', and by that time the | |
5313 | breakpoint at "foo" is long gone from the breakpoint table. | |
5314 | If we vforked, then we don't need to unpatch here, since both | |
5315 | parent and child are sharing the same memory pages; we'll | |
5316 | need to unpatch at follow/detach time instead to be certain | |
5317 | that new breakpoints added between catchpoint hit time and | |
5318 | vfork follow are detached. */ | |
5319 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5320 | { | |
b242c3c2 PA |
5321 | /* This won't actually modify the breakpoint list, but will |
5322 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5323 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5324 | } |
5325 | ||
34b7e8a6 | 5326 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5327 | |
e58b0e63 PA |
5328 | /* In case the event is caught by a catchpoint, remember that |
5329 | the event is to be followed at the next resume of the thread, | |
5330 | and not immediately. */ | |
5331 | ecs->event_thread->pending_follow = ecs->ws; | |
5332 | ||
f2ffa92b PA |
5333 | ecs->event_thread->suspend.stop_pc |
5334 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 5335 | |
16c381f0 | 5336 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5337 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5338 | ecs->event_thread->suspend.stop_pc, |
5339 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 5340 | |
c65d6b55 PA |
5341 | if (handle_stop_requested (ecs)) |
5342 | return; | |
5343 | ||
ce12b012 PA |
5344 | /* If no catchpoint triggered for this, then keep going. Note |
5345 | that we're interested in knowing the bpstat actually causes a | |
5346 | stop, not just if it may explain the signal. Software | |
5347 | watchpoints, for example, always appear in the bpstat. */ | |
5348 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5349 | { |
e58b0e63 | 5350 | int should_resume; |
3e43a32a MS |
5351 | int follow_child |
5352 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 5353 | |
a493e3e2 | 5354 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 | 5355 | |
5b6d1e4f PA |
5356 | process_stratum_target *targ |
5357 | = ecs->event_thread->inf->process_target (); | |
5358 | ||
e58b0e63 PA |
5359 | should_resume = follow_fork (); |
5360 | ||
5b6d1e4f PA |
5361 | /* Note that one of these may be an invalid pointer, |
5362 | depending on detach_fork. */ | |
00431a78 | 5363 | thread_info *parent = ecs->event_thread; |
5b6d1e4f PA |
5364 | thread_info *child |
5365 | = find_thread_ptid (targ, ecs->ws.value.related_pid); | |
6c95b8df | 5366 | |
a2077e25 PA |
5367 | /* At this point, the parent is marked running, and the |
5368 | child is marked stopped. */ | |
5369 | ||
5370 | /* If not resuming the parent, mark it stopped. */ | |
5371 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5372 | parent->set_running (false); |
a2077e25 PA |
5373 | |
5374 | /* If resuming the child, mark it running. */ | |
5375 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5376 | child->set_running (true); |
a2077e25 | 5377 | |
6c95b8df | 5378 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5379 | if (!detach_fork && (non_stop |
5380 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5381 | { |
5382 | if (follow_child) | |
5383 | switch_to_thread (parent); | |
5384 | else | |
5385 | switch_to_thread (child); | |
5386 | ||
5387 | ecs->event_thread = inferior_thread (); | |
5388 | ecs->ptid = inferior_ptid; | |
5389 | keep_going (ecs); | |
5390 | } | |
5391 | ||
5392 | if (follow_child) | |
5393 | switch_to_thread (child); | |
5394 | else | |
5395 | switch_to_thread (parent); | |
5396 | ||
e58b0e63 PA |
5397 | ecs->event_thread = inferior_thread (); |
5398 | ecs->ptid = inferior_ptid; | |
5399 | ||
5400 | if (should_resume) | |
5401 | keep_going (ecs); | |
5402 | else | |
22bcd14b | 5403 | stop_waiting (ecs); |
04e68871 DJ |
5404 | return; |
5405 | } | |
94c57d6a PA |
5406 | process_event_stop_test (ecs); |
5407 | return; | |
488f131b | 5408 | |
6c95b8df PA |
5409 | case TARGET_WAITKIND_VFORK_DONE: |
5410 | /* Done with the shared memory region. Re-insert breakpoints in | |
5411 | the parent, and keep going. */ | |
5412 | ||
00431a78 | 5413 | context_switch (ecs); |
6c95b8df PA |
5414 | |
5415 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5416 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5417 | |
5418 | if (handle_stop_requested (ecs)) | |
5419 | return; | |
5420 | ||
6c95b8df PA |
5421 | /* This also takes care of reinserting breakpoints in the |
5422 | previously locked inferior. */ | |
5423 | keep_going (ecs); | |
5424 | return; | |
5425 | ||
488f131b | 5426 | case TARGET_WAITKIND_EXECD: |
488f131b | 5427 | |
cbd2b4e3 PA |
5428 | /* Note we can't read registers yet (the stop_pc), because we |
5429 | don't yet know the inferior's post-exec architecture. | |
5430 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5431 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5432 | |
6c95b8df PA |
5433 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5434 | handle_vfork_child_exec_or_exit (1); | |
5435 | ||
795e548f PA |
5436 | /* This causes the eventpoints and symbol table to be reset. |
5437 | Must do this now, before trying to determine whether to | |
5438 | stop. */ | |
71b43ef8 | 5439 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5440 | |
17d8546e DB |
5441 | /* In follow_exec we may have deleted the original thread and |
5442 | created a new one. Make sure that the event thread is the | |
5443 | execd thread for that case (this is a nop otherwise). */ | |
5444 | ecs->event_thread = inferior_thread (); | |
5445 | ||
f2ffa92b PA |
5446 | ecs->event_thread->suspend.stop_pc |
5447 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5448 | |
16c381f0 | 5449 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5450 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5451 | ecs->event_thread->suspend.stop_pc, |
5452 | ecs->event_thread, &ecs->ws); | |
795e548f | 5453 | |
71b43ef8 PA |
5454 | /* Note that this may be referenced from inside |
5455 | bpstat_stop_status above, through inferior_has_execd. */ | |
5456 | xfree (ecs->ws.value.execd_pathname); | |
5457 | ecs->ws.value.execd_pathname = NULL; | |
5458 | ||
c65d6b55 PA |
5459 | if (handle_stop_requested (ecs)) |
5460 | return; | |
5461 | ||
04e68871 | 5462 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5463 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5464 | { |
a493e3e2 | 5465 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5466 | keep_going (ecs); |
5467 | return; | |
5468 | } | |
94c57d6a PA |
5469 | process_event_stop_test (ecs); |
5470 | return; | |
488f131b | 5471 | |
b4dc5ffa MK |
5472 | /* Be careful not to try to gather much state about a thread |
5473 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5474 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5475 | /* Getting the current syscall number. */ |
94c57d6a PA |
5476 | if (handle_syscall_event (ecs) == 0) |
5477 | process_event_stop_test (ecs); | |
5478 | return; | |
c906108c | 5479 | |
488f131b JB |
5480 | /* Before examining the threads further, step this thread to |
5481 | get it entirely out of the syscall. (We get notice of the | |
5482 | event when the thread is just on the verge of exiting a | |
5483 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5484 | into user code.) */ |
488f131b | 5485 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5486 | if (handle_syscall_event (ecs) == 0) |
5487 | process_event_stop_test (ecs); | |
5488 | return; | |
c906108c | 5489 | |
488f131b | 5490 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5491 | handle_signal_stop (ecs); |
5492 | return; | |
c906108c | 5493 | |
b2175913 MS |
5494 | case TARGET_WAITKIND_NO_HISTORY: |
5495 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5496 | |
d1988021 | 5497 | /* Switch to the stopped thread. */ |
00431a78 | 5498 | context_switch (ecs); |
d1988021 MM |
5499 | if (debug_infrun) |
5500 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
5501 | ||
34b7e8a6 | 5502 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5503 | ecs->event_thread->suspend.stop_pc |
5504 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5505 | |
5506 | if (handle_stop_requested (ecs)) | |
5507 | return; | |
5508 | ||
76727919 | 5509 | gdb::observers::no_history.notify (); |
22bcd14b | 5510 | stop_waiting (ecs); |
b2175913 | 5511 | return; |
488f131b | 5512 | } |
4f5d7f63 PA |
5513 | } |
5514 | ||
372316f1 PA |
5515 | /* Restart threads back to what they were trying to do back when we |
5516 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5517 | ignored. */ | |
4d9d9d04 PA |
5518 | |
5519 | static void | |
372316f1 PA |
5520 | restart_threads (struct thread_info *event_thread) |
5521 | { | |
372316f1 PA |
5522 | /* In case the instruction just stepped spawned a new thread. */ |
5523 | update_thread_list (); | |
5524 | ||
08036331 | 5525 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5526 | { |
f3f8ece4 PA |
5527 | switch_to_thread_no_regs (tp); |
5528 | ||
372316f1 PA |
5529 | if (tp == event_thread) |
5530 | { | |
5531 | if (debug_infrun) | |
5532 | fprintf_unfiltered (gdb_stdlog, | |
5533 | "infrun: restart threads: " | |
5534 | "[%s] is event thread\n", | |
a068643d | 5535 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5536 | continue; |
5537 | } | |
5538 | ||
5539 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5540 | { | |
5541 | if (debug_infrun) | |
5542 | fprintf_unfiltered (gdb_stdlog, | |
5543 | "infrun: restart threads: " | |
5544 | "[%s] not meant to be running\n", | |
a068643d | 5545 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5546 | continue; |
5547 | } | |
5548 | ||
5549 | if (tp->resumed) | |
5550 | { | |
5551 | if (debug_infrun) | |
5552 | fprintf_unfiltered (gdb_stdlog, | |
5553 | "infrun: restart threads: [%s] resumed\n", | |
a068643d | 5554 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5555 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
5556 | continue; | |
5557 | } | |
5558 | ||
5559 | if (thread_is_in_step_over_chain (tp)) | |
5560 | { | |
5561 | if (debug_infrun) | |
5562 | fprintf_unfiltered (gdb_stdlog, | |
5563 | "infrun: restart threads: " | |
5564 | "[%s] needs step-over\n", | |
a068643d | 5565 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5566 | gdb_assert (!tp->resumed); |
5567 | continue; | |
5568 | } | |
5569 | ||
5570 | ||
5571 | if (tp->suspend.waitstatus_pending_p) | |
5572 | { | |
5573 | if (debug_infrun) | |
5574 | fprintf_unfiltered (gdb_stdlog, | |
5575 | "infrun: restart threads: " | |
5576 | "[%s] has pending status\n", | |
a068643d | 5577 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5578 | tp->resumed = 1; |
5579 | continue; | |
5580 | } | |
5581 | ||
c65d6b55 PA |
5582 | gdb_assert (!tp->stop_requested); |
5583 | ||
372316f1 PA |
5584 | /* If some thread needs to start a step-over at this point, it |
5585 | should still be in the step-over queue, and thus skipped | |
5586 | above. */ | |
5587 | if (thread_still_needs_step_over (tp)) | |
5588 | { | |
5589 | internal_error (__FILE__, __LINE__, | |
5590 | "thread [%s] needs a step-over, but not in " | |
5591 | "step-over queue\n", | |
a068643d | 5592 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5593 | } |
5594 | ||
5595 | if (currently_stepping (tp)) | |
5596 | { | |
5597 | if (debug_infrun) | |
5598 | fprintf_unfiltered (gdb_stdlog, | |
5599 | "infrun: restart threads: [%s] was stepping\n", | |
a068643d | 5600 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5601 | keep_going_stepped_thread (tp); |
5602 | } | |
5603 | else | |
5604 | { | |
5605 | struct execution_control_state ecss; | |
5606 | struct execution_control_state *ecs = &ecss; | |
5607 | ||
5608 | if (debug_infrun) | |
5609 | fprintf_unfiltered (gdb_stdlog, | |
5610 | "infrun: restart threads: [%s] continuing\n", | |
a068643d | 5611 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 | 5612 | reset_ecs (ecs, tp); |
00431a78 | 5613 | switch_to_thread (tp); |
372316f1 PA |
5614 | keep_going_pass_signal (ecs); |
5615 | } | |
5616 | } | |
5617 | } | |
5618 | ||
5619 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5620 | a pending waitstatus. */ | |
5621 | ||
5622 | static int | |
5623 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5624 | void *arg) | |
5625 | { | |
5626 | return (tp->resumed | |
5627 | && tp->suspend.waitstatus_pending_p); | |
5628 | } | |
5629 | ||
5630 | /* Called when we get an event that may finish an in-line or | |
5631 | out-of-line (displaced stepping) step-over started previously. | |
5632 | Return true if the event is processed and we should go back to the | |
5633 | event loop; false if the caller should continue processing the | |
5634 | event. */ | |
5635 | ||
5636 | static int | |
4d9d9d04 PA |
5637 | finish_step_over (struct execution_control_state *ecs) |
5638 | { | |
372316f1 PA |
5639 | int had_step_over_info; |
5640 | ||
00431a78 | 5641 | displaced_step_fixup (ecs->event_thread, |
4d9d9d04 PA |
5642 | ecs->event_thread->suspend.stop_signal); |
5643 | ||
372316f1 PA |
5644 | had_step_over_info = step_over_info_valid_p (); |
5645 | ||
5646 | if (had_step_over_info) | |
4d9d9d04 PA |
5647 | { |
5648 | /* If we're stepping over a breakpoint with all threads locked, | |
5649 | then only the thread that was stepped should be reporting | |
5650 | back an event. */ | |
5651 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5652 | ||
c65d6b55 | 5653 | clear_step_over_info (); |
4d9d9d04 PA |
5654 | } |
5655 | ||
fbea99ea | 5656 | if (!target_is_non_stop_p ()) |
372316f1 | 5657 | return 0; |
4d9d9d04 PA |
5658 | |
5659 | /* Start a new step-over in another thread if there's one that | |
5660 | needs it. */ | |
5661 | start_step_over (); | |
372316f1 PA |
5662 | |
5663 | /* If we were stepping over a breakpoint before, and haven't started | |
5664 | a new in-line step-over sequence, then restart all other threads | |
5665 | (except the event thread). We can't do this in all-stop, as then | |
5666 | e.g., we wouldn't be able to issue any other remote packet until | |
5667 | these other threads stop. */ | |
5668 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5669 | { | |
5670 | struct thread_info *pending; | |
5671 | ||
5672 | /* If we only have threads with pending statuses, the restart | |
5673 | below won't restart any thread and so nothing re-inserts the | |
5674 | breakpoint we just stepped over. But we need it inserted | |
5675 | when we later process the pending events, otherwise if | |
5676 | another thread has a pending event for this breakpoint too, | |
5677 | we'd discard its event (because the breakpoint that | |
5678 | originally caused the event was no longer inserted). */ | |
00431a78 | 5679 | context_switch (ecs); |
372316f1 PA |
5680 | insert_breakpoints (); |
5681 | ||
5682 | restart_threads (ecs->event_thread); | |
5683 | ||
5684 | /* If we have events pending, go through handle_inferior_event | |
5685 | again, picking up a pending event at random. This avoids | |
5686 | thread starvation. */ | |
5687 | ||
5688 | /* But not if we just stepped over a watchpoint in order to let | |
5689 | the instruction execute so we can evaluate its expression. | |
5690 | The set of watchpoints that triggered is recorded in the | |
5691 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5692 | If we processed another event first, that other event could | |
5693 | clobber this info. */ | |
5694 | if (ecs->event_thread->stepping_over_watchpoint) | |
5695 | return 0; | |
5696 | ||
5697 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5698 | NULL); | |
5699 | if (pending != NULL) | |
5700 | { | |
5701 | struct thread_info *tp = ecs->event_thread; | |
5702 | struct regcache *regcache; | |
5703 | ||
5704 | if (debug_infrun) | |
5705 | { | |
5706 | fprintf_unfiltered (gdb_stdlog, | |
5707 | "infrun: found resumed threads with " | |
5708 | "pending events, saving status\n"); | |
5709 | } | |
5710 | ||
5711 | gdb_assert (pending != tp); | |
5712 | ||
5713 | /* Record the event thread's event for later. */ | |
5714 | save_waitstatus (tp, &ecs->ws); | |
5715 | /* This was cleared early, by handle_inferior_event. Set it | |
5716 | so this pending event is considered by | |
5717 | do_target_wait. */ | |
5718 | tp->resumed = 1; | |
5719 | ||
5720 | gdb_assert (!tp->executing); | |
5721 | ||
00431a78 | 5722 | regcache = get_thread_regcache (tp); |
372316f1 PA |
5723 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
5724 | ||
5725 | if (debug_infrun) | |
5726 | { | |
5727 | fprintf_unfiltered (gdb_stdlog, | |
5728 | "infrun: saved stop_pc=%s for %s " | |
5729 | "(currently_stepping=%d)\n", | |
5730 | paddress (target_gdbarch (), | |
5731 | tp->suspend.stop_pc), | |
a068643d | 5732 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
5733 | currently_stepping (tp)); |
5734 | } | |
5735 | ||
5736 | /* This in-line step-over finished; clear this so we won't | |
5737 | start a new one. This is what handle_signal_stop would | |
5738 | do, if we returned false. */ | |
5739 | tp->stepping_over_breakpoint = 0; | |
5740 | ||
5741 | /* Wake up the event loop again. */ | |
5742 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5743 | ||
5744 | prepare_to_wait (ecs); | |
5745 | return 1; | |
5746 | } | |
5747 | } | |
5748 | ||
5749 | return 0; | |
4d9d9d04 PA |
5750 | } |
5751 | ||
4f5d7f63 PA |
5752 | /* Come here when the program has stopped with a signal. */ |
5753 | ||
5754 | static void | |
5755 | handle_signal_stop (struct execution_control_state *ecs) | |
5756 | { | |
5757 | struct frame_info *frame; | |
5758 | struct gdbarch *gdbarch; | |
5759 | int stopped_by_watchpoint; | |
5760 | enum stop_kind stop_soon; | |
5761 | int random_signal; | |
c906108c | 5762 | |
f0407826 DE |
5763 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5764 | ||
c65d6b55 PA |
5765 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5766 | ||
f0407826 DE |
5767 | /* Do we need to clean up the state of a thread that has |
5768 | completed a displaced single-step? (Doing so usually affects | |
5769 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5770 | if (finish_step_over (ecs)) |
5771 | return; | |
f0407826 DE |
5772 | |
5773 | /* If we either finished a single-step or hit a breakpoint, but | |
5774 | the user wanted this thread to be stopped, pretend we got a | |
5775 | SIG0 (generic unsignaled stop). */ | |
5776 | if (ecs->event_thread->stop_requested | |
5777 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5778 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5779 | |
f2ffa92b PA |
5780 | ecs->event_thread->suspend.stop_pc |
5781 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 5782 | |
527159b7 | 5783 | if (debug_infrun) |
237fc4c9 | 5784 | { |
00431a78 | 5785 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 5786 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 5787 | |
f3f8ece4 | 5788 | switch_to_thread (ecs->event_thread); |
5af949e3 UW |
5789 | |
5790 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
b926417a | 5791 | paddress (reg_gdbarch, |
f2ffa92b | 5792 | ecs->event_thread->suspend.stop_pc)); |
d92524f1 | 5793 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5794 | { |
5795 | CORE_ADDR addr; | |
abbb1732 | 5796 | |
237fc4c9 PA |
5797 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
5798 | ||
8b88a78e | 5799 | if (target_stopped_data_address (current_top_target (), &addr)) |
237fc4c9 | 5800 | fprintf_unfiltered (gdb_stdlog, |
5af949e3 | 5801 | "infrun: stopped data address = %s\n", |
b926417a | 5802 | paddress (reg_gdbarch, addr)); |
237fc4c9 PA |
5803 | else |
5804 | fprintf_unfiltered (gdb_stdlog, | |
5805 | "infrun: (no data address available)\n"); | |
5806 | } | |
5807 | } | |
527159b7 | 5808 | |
36fa8042 PA |
5809 | /* This is originated from start_remote(), start_inferior() and |
5810 | shared libraries hook functions. */ | |
00431a78 | 5811 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
5812 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
5813 | { | |
00431a78 | 5814 | context_switch (ecs); |
36fa8042 PA |
5815 | if (debug_infrun) |
5816 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
5817 | stop_print_frame = 1; | |
22bcd14b | 5818 | stop_waiting (ecs); |
36fa8042 PA |
5819 | return; |
5820 | } | |
5821 | ||
36fa8042 PA |
5822 | /* This originates from attach_command(). We need to overwrite |
5823 | the stop_signal here, because some kernels don't ignore a | |
5824 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5825 | See more comments in inferior.h. On the other hand, if we | |
5826 | get a non-SIGSTOP, report it to the user - assume the backend | |
5827 | will handle the SIGSTOP if it should show up later. | |
5828 | ||
5829 | Also consider that the attach is complete when we see a | |
5830 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5831 | target extended-remote report it instead of a SIGSTOP | |
5832 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5833 | signal, so this is no exception. | |
5834 | ||
5835 | Also consider that the attach is complete when we see a | |
5836 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5837 | the target to stop all threads of the inferior, in case the | |
5838 | low level attach operation doesn't stop them implicitly. If | |
5839 | they weren't stopped implicitly, then the stub will report a | |
5840 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5841 | other than GDB's request. */ | |
5842 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5843 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5844 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5845 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5846 | { | |
5847 | stop_print_frame = 1; | |
22bcd14b | 5848 | stop_waiting (ecs); |
36fa8042 PA |
5849 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5850 | return; | |
5851 | } | |
5852 | ||
488f131b | 5853 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 | 5854 | so, then switch to that thread. */ |
d7e15655 | 5855 | if (ecs->ptid != inferior_ptid) |
488f131b | 5856 | { |
527159b7 | 5857 | if (debug_infrun) |
8a9de0e4 | 5858 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 5859 | |
00431a78 | 5860 | context_switch (ecs); |
c5aa993b | 5861 | |
9a4105ab | 5862 | if (deprecated_context_hook) |
00431a78 | 5863 | deprecated_context_hook (ecs->event_thread->global_num); |
488f131b | 5864 | } |
c906108c | 5865 | |
568d6575 UW |
5866 | /* At this point, get hold of the now-current thread's frame. */ |
5867 | frame = get_current_frame (); | |
5868 | gdbarch = get_frame_arch (frame); | |
5869 | ||
2adfaa28 | 5870 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5871 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5872 | { |
af48d08f | 5873 | struct regcache *regcache; |
af48d08f | 5874 | CORE_ADDR pc; |
2adfaa28 | 5875 | |
00431a78 | 5876 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
5877 | const address_space *aspace = regcache->aspace (); |
5878 | ||
af48d08f | 5879 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 5880 | |
af48d08f PA |
5881 | /* However, before doing so, if this single-step breakpoint was |
5882 | actually for another thread, set this thread up for moving | |
5883 | past it. */ | |
5884 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5885 | aspace, pc)) | |
5886 | { | |
5887 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
5888 | { |
5889 | if (debug_infrun) | |
5890 | { | |
5891 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 5892 | "infrun: [%s] hit another thread's " |
34b7e8a6 | 5893 | "single-step breakpoint\n", |
a068643d | 5894 | target_pid_to_str (ecs->ptid).c_str ()); |
2adfaa28 | 5895 | } |
af48d08f PA |
5896 | ecs->hit_singlestep_breakpoint = 1; |
5897 | } | |
5898 | } | |
5899 | else | |
5900 | { | |
5901 | if (debug_infrun) | |
5902 | { | |
5903 | fprintf_unfiltered (gdb_stdlog, | |
5904 | "infrun: [%s] hit its " | |
5905 | "single-step breakpoint\n", | |
a068643d | 5906 | target_pid_to_str (ecs->ptid).c_str ()); |
2adfaa28 PA |
5907 | } |
5908 | } | |
488f131b | 5909 | } |
af48d08f | 5910 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 5911 | |
963f9c80 PA |
5912 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5913 | && ecs->event_thread->control.trap_expected | |
5914 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
5915 | stopped_by_watchpoint = 0; |
5916 | else | |
5917 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
5918 | ||
5919 | /* If necessary, step over this watchpoint. We'll be back to display | |
5920 | it in a moment. */ | |
5921 | if (stopped_by_watchpoint | |
d92524f1 | 5922 | && (target_have_steppable_watchpoint |
568d6575 | 5923 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 5924 | { |
488f131b JB |
5925 | /* At this point, we are stopped at an instruction which has |
5926 | attempted to write to a piece of memory under control of | |
5927 | a watchpoint. The instruction hasn't actually executed | |
5928 | yet. If we were to evaluate the watchpoint expression | |
5929 | now, we would get the old value, and therefore no change | |
5930 | would seem to have occurred. | |
5931 | ||
5932 | In order to make watchpoints work `right', we really need | |
5933 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
5934 | watchpoint expression. We do this by single-stepping the |
5935 | target. | |
5936 | ||
7f89fd65 | 5937 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
5938 | it. For example, the PA can (with some kernel cooperation) |
5939 | single step over a watchpoint without disabling the watchpoint. | |
5940 | ||
5941 | It is far more common to need to disable a watchpoint to step | |
5942 | the inferior over it. If we have non-steppable watchpoints, | |
5943 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
5944 | disable all watchpoints. |
5945 | ||
5946 | Any breakpoint at PC must also be stepped over -- if there's | |
5947 | one, it will have already triggered before the watchpoint | |
5948 | triggered, and we either already reported it to the user, or | |
5949 | it didn't cause a stop and we called keep_going. In either | |
5950 | case, if there was a breakpoint at PC, we must be trying to | |
5951 | step past it. */ | |
5952 | ecs->event_thread->stepping_over_watchpoint = 1; | |
5953 | keep_going (ecs); | |
488f131b JB |
5954 | return; |
5955 | } | |
5956 | ||
4e1c45ea | 5957 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 5958 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
5959 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
5960 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 5961 | stop_print_frame = 1; |
488f131b | 5962 | stopped_by_random_signal = 0; |
ddfe970e | 5963 | bpstat stop_chain = NULL; |
488f131b | 5964 | |
edb3359d DJ |
5965 | /* Hide inlined functions starting here, unless we just performed stepi or |
5966 | nexti. After stepi and nexti, always show the innermost frame (not any | |
5967 | inline function call sites). */ | |
16c381f0 | 5968 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 5969 | { |
00431a78 PA |
5970 | const address_space *aspace |
5971 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
5972 | |
5973 | /* skip_inline_frames is expensive, so we avoid it if we can | |
5974 | determine that the address is one where functions cannot have | |
5975 | been inlined. This improves performance with inferiors that | |
5976 | load a lot of shared libraries, because the solib event | |
5977 | breakpoint is defined as the address of a function (i.e. not | |
5978 | inline). Note that we have to check the previous PC as well | |
5979 | as the current one to catch cases when we have just | |
5980 | single-stepped off a breakpoint prior to reinstating it. | |
5981 | Note that we're assuming that the code we single-step to is | |
5982 | not inline, but that's not definitive: there's nothing | |
5983 | preventing the event breakpoint function from containing | |
5984 | inlined code, and the single-step ending up there. If the | |
5985 | user had set a breakpoint on that inlined code, the missing | |
5986 | skip_inline_frames call would break things. Fortunately | |
5987 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
5988 | if (!pc_at_non_inline_function (aspace, |
5989 | ecs->event_thread->suspend.stop_pc, | |
5990 | &ecs->ws) | |
a210c238 MR |
5991 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
5992 | && ecs->event_thread->control.trap_expected | |
5993 | && pc_at_non_inline_function (aspace, | |
5994 | ecs->event_thread->prev_pc, | |
09ac7c10 | 5995 | &ecs->ws))) |
1c5a993e | 5996 | { |
f2ffa92b PA |
5997 | stop_chain = build_bpstat_chain (aspace, |
5998 | ecs->event_thread->suspend.stop_pc, | |
5999 | &ecs->ws); | |
00431a78 | 6000 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
6001 | |
6002 | /* Re-fetch current thread's frame in case that invalidated | |
6003 | the frame cache. */ | |
6004 | frame = get_current_frame (); | |
6005 | gdbarch = get_frame_arch (frame); | |
6006 | } | |
0574c78f | 6007 | } |
edb3359d | 6008 | |
a493e3e2 | 6009 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 6010 | && ecs->event_thread->control.trap_expected |
568d6575 | 6011 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6012 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6013 | { |
b50d7442 | 6014 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6015 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6016 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6017 | with a delay slot. It needs to be stepped twice, once for |
6018 | the instruction and once for the delay slot. */ | |
6019 | int step_through_delay | |
568d6575 | 6020 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6021 | |
527159b7 | 6022 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 6023 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
6024 | if (ecs->event_thread->control.step_range_end == 0 |
6025 | && step_through_delay) | |
3352ef37 AC |
6026 | { |
6027 | /* The user issued a continue when stopped at a breakpoint. | |
6028 | Set up for another trap and get out of here. */ | |
4e1c45ea | 6029 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6030 | keep_going (ecs); |
6031 | return; | |
6032 | } | |
6033 | else if (step_through_delay) | |
6034 | { | |
6035 | /* The user issued a step when stopped at a breakpoint. | |
6036 | Maybe we should stop, maybe we should not - the delay | |
6037 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6038 | case, don't decide that here, just set |
6039 | ecs->stepping_over_breakpoint, making sure we | |
6040 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6041 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6042 | } |
6043 | } | |
6044 | ||
ab04a2af TT |
6045 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6046 | handles this event. */ | |
6047 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6048 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
6049 | ecs->event_thread->suspend.stop_pc, |
6050 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 6051 | |
ab04a2af TT |
6052 | /* Following in case break condition called a |
6053 | function. */ | |
6054 | stop_print_frame = 1; | |
73dd234f | 6055 | |
ab04a2af TT |
6056 | /* This is where we handle "moribund" watchpoints. Unlike |
6057 | software breakpoints traps, hardware watchpoint traps are | |
6058 | always distinguishable from random traps. If no high-level | |
6059 | watchpoint is associated with the reported stop data address | |
6060 | anymore, then the bpstat does not explain the signal --- | |
6061 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6062 | set. */ | |
6063 | ||
6064 | if (debug_infrun | |
6065 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 6066 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6067 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
6068 | && stopped_by_watchpoint) |
6069 | fprintf_unfiltered (gdb_stdlog, | |
6070 | "infrun: no user watchpoint explains " | |
6071 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 6072 | |
bac7d97b | 6073 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6074 | at one stage in the past included checks for an inferior |
6075 | function call's call dummy's return breakpoint. The original | |
6076 | comment, that went with the test, read: | |
03cebad2 | 6077 | |
ab04a2af TT |
6078 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6079 | another signal besides SIGTRAP, so check here as well as | |
6080 | above.'' | |
73dd234f | 6081 | |
ab04a2af TT |
6082 | If someone ever tries to get call dummys on a |
6083 | non-executable stack to work (where the target would stop | |
6084 | with something like a SIGSEGV), then those tests might need | |
6085 | to be re-instated. Given, however, that the tests were only | |
6086 | enabled when momentary breakpoints were not being used, I | |
6087 | suspect that it won't be the case. | |
488f131b | 6088 | |
ab04a2af TT |
6089 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6090 | be necessary for call dummies on a non-executable stack on | |
6091 | SPARC. */ | |
488f131b | 6092 | |
bac7d97b | 6093 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6094 | random_signal |
6095 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
6096 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 6097 | |
1cf4d951 PA |
6098 | /* Maybe this was a trap for a software breakpoint that has since |
6099 | been removed. */ | |
6100 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6101 | { | |
f2ffa92b PA |
6102 | if (program_breakpoint_here_p (gdbarch, |
6103 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
6104 | { |
6105 | struct regcache *regcache; | |
6106 | int decr_pc; | |
6107 | ||
6108 | /* Re-adjust PC to what the program would see if GDB was not | |
6109 | debugging it. */ | |
00431a78 | 6110 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6111 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6112 | if (decr_pc != 0) |
6113 | { | |
07036511 TT |
6114 | gdb::optional<scoped_restore_tmpl<int>> |
6115 | restore_operation_disable; | |
1cf4d951 PA |
6116 | |
6117 | if (record_full_is_used ()) | |
07036511 TT |
6118 | restore_operation_disable.emplace |
6119 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6120 | |
f2ffa92b PA |
6121 | regcache_write_pc (regcache, |
6122 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
6123 | } |
6124 | } | |
6125 | else | |
6126 | { | |
6127 | /* A delayed software breakpoint event. Ignore the trap. */ | |
6128 | if (debug_infrun) | |
6129 | fprintf_unfiltered (gdb_stdlog, | |
6130 | "infrun: delayed software breakpoint " | |
6131 | "trap, ignoring\n"); | |
6132 | random_signal = 0; | |
6133 | } | |
6134 | } | |
6135 | ||
6136 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6137 | has since been removed. */ | |
6138 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6139 | { | |
6140 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
6141 | if (debug_infrun) | |
6142 | fprintf_unfiltered (gdb_stdlog, | |
6143 | "infrun: delayed hardware breakpoint/watchpoint " | |
6144 | "trap, ignoring\n"); | |
6145 | random_signal = 0; | |
6146 | } | |
6147 | ||
bac7d97b PA |
6148 | /* If not, perhaps stepping/nexting can. */ |
6149 | if (random_signal) | |
6150 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6151 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6152 | |
2adfaa28 PA |
6153 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6154 | thread. Single-step breakpoints are transparent to the | |
6155 | breakpoints module. */ | |
6156 | if (random_signal) | |
6157 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6158 | ||
bac7d97b PA |
6159 | /* No? Perhaps we got a moribund watchpoint. */ |
6160 | if (random_signal) | |
6161 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6162 | |
c65d6b55 PA |
6163 | /* Always stop if the user explicitly requested this thread to |
6164 | remain stopped. */ | |
6165 | if (ecs->event_thread->stop_requested) | |
6166 | { | |
6167 | random_signal = 1; | |
6168 | if (debug_infrun) | |
6169 | fprintf_unfiltered (gdb_stdlog, "infrun: user-requested stop\n"); | |
6170 | } | |
6171 | ||
488f131b JB |
6172 | /* For the program's own signals, act according to |
6173 | the signal handling tables. */ | |
6174 | ||
ce12b012 | 6175 | if (random_signal) |
488f131b JB |
6176 | { |
6177 | /* Signal not for debugging purposes. */ | |
5b6d1e4f | 6178 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
c9737c08 | 6179 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6180 | |
527159b7 | 6181 | if (debug_infrun) |
c9737c08 PA |
6182 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
6183 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6184 | |
488f131b JB |
6185 | stopped_by_random_signal = 1; |
6186 | ||
252fbfc8 PA |
6187 | /* Always stop on signals if we're either just gaining control |
6188 | of the program, or the user explicitly requested this thread | |
6189 | to remain stopped. */ | |
d6b48e9c | 6190 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6191 | || ecs->event_thread->stop_requested |
24291992 | 6192 | || (!inf->detaching |
16c381f0 | 6193 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 6194 | { |
22bcd14b | 6195 | stop_waiting (ecs); |
488f131b JB |
6196 | return; |
6197 | } | |
b57bacec PA |
6198 | |
6199 | /* Notify observers the signal has "handle print" set. Note we | |
6200 | returned early above if stopping; normal_stop handles the | |
6201 | printing in that case. */ | |
6202 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6203 | { | |
6204 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6205 | target_terminal::ours_for_output (); |
76727919 | 6206 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 6207 | target_terminal::inferior (); |
b57bacec | 6208 | } |
488f131b JB |
6209 | |
6210 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6211 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6212 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6213 | |
f2ffa92b | 6214 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 6215 | && ecs->event_thread->control.trap_expected |
8358c15c | 6216 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6217 | { |
6218 | /* We were just starting a new sequence, attempting to | |
6219 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6220 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6221 | of the stepping range so GDB needs to remember to, when |
6222 | the signal handler returns, resume stepping off that | |
6223 | breakpoint. */ | |
6224 | /* To simplify things, "continue" is forced to use the same | |
6225 | code paths as single-step - set a breakpoint at the | |
6226 | signal return address and then, once hit, step off that | |
6227 | breakpoint. */ | |
237fc4c9 PA |
6228 | if (debug_infrun) |
6229 | fprintf_unfiltered (gdb_stdlog, | |
6230 | "infrun: signal arrived while stepping over " | |
6231 | "breakpoint\n"); | |
d3169d93 | 6232 | |
2c03e5be | 6233 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6234 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6235 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6236 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6237 | |
6238 | /* If we were nexting/stepping some other thread, switch to | |
6239 | it, so that we don't continue it, losing control. */ | |
6240 | if (!switch_back_to_stepped_thread (ecs)) | |
6241 | keep_going (ecs); | |
9d799f85 | 6242 | return; |
68f53502 | 6243 | } |
9d799f85 | 6244 | |
e5f8a7cc | 6245 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
6246 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6247 | ecs->event_thread) | |
e5f8a7cc | 6248 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 6249 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6250 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6251 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6252 | { |
6253 | /* The inferior is about to take a signal that will take it | |
6254 | out of the single step range. Set a breakpoint at the | |
6255 | current PC (which is presumably where the signal handler | |
6256 | will eventually return) and then allow the inferior to | |
6257 | run free. | |
6258 | ||
6259 | Note that this is only needed for a signal delivered | |
6260 | while in the single-step range. Nested signals aren't a | |
6261 | problem as they eventually all return. */ | |
237fc4c9 PA |
6262 | if (debug_infrun) |
6263 | fprintf_unfiltered (gdb_stdlog, | |
6264 | "infrun: signal may take us out of " | |
6265 | "single-step range\n"); | |
6266 | ||
372316f1 | 6267 | clear_step_over_info (); |
2c03e5be | 6268 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6269 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6270 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6271 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6272 | keep_going (ecs); |
6273 | return; | |
d303a6c7 | 6274 | } |
9d799f85 | 6275 | |
85102364 | 6276 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6277 | when either there's a nested signal, or when there's a |
6278 | pending signal enabled just as the signal handler returns | |
6279 | (leaving the inferior at the step-resume-breakpoint without | |
6280 | actually executing it). Either way continue until the | |
6281 | breakpoint is really hit. */ | |
c447ac0b PA |
6282 | |
6283 | if (!switch_back_to_stepped_thread (ecs)) | |
6284 | { | |
6285 | if (debug_infrun) | |
6286 | fprintf_unfiltered (gdb_stdlog, | |
6287 | "infrun: random signal, keep going\n"); | |
6288 | ||
6289 | keep_going (ecs); | |
6290 | } | |
6291 | return; | |
488f131b | 6292 | } |
94c57d6a PA |
6293 | |
6294 | process_event_stop_test (ecs); | |
6295 | } | |
6296 | ||
6297 | /* Come here when we've got some debug event / signal we can explain | |
6298 | (IOW, not a random signal), and test whether it should cause a | |
6299 | stop, or whether we should resume the inferior (transparently). | |
6300 | E.g., could be a breakpoint whose condition evaluates false; we | |
6301 | could be still stepping within the line; etc. */ | |
6302 | ||
6303 | static void | |
6304 | process_event_stop_test (struct execution_control_state *ecs) | |
6305 | { | |
6306 | struct symtab_and_line stop_pc_sal; | |
6307 | struct frame_info *frame; | |
6308 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6309 | CORE_ADDR jmp_buf_pc; |
6310 | struct bpstat_what what; | |
94c57d6a | 6311 | |
cdaa5b73 | 6312 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6313 | |
cdaa5b73 PA |
6314 | frame = get_current_frame (); |
6315 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6316 | |
cdaa5b73 | 6317 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6318 | |
cdaa5b73 PA |
6319 | if (what.call_dummy) |
6320 | { | |
6321 | stop_stack_dummy = what.call_dummy; | |
6322 | } | |
186c406b | 6323 | |
243a9253 PA |
6324 | /* A few breakpoint types have callbacks associated (e.g., |
6325 | bp_jit_event). Run them now. */ | |
6326 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6327 | ||
cdaa5b73 PA |
6328 | /* If we hit an internal event that triggers symbol changes, the |
6329 | current frame will be invalidated within bpstat_what (e.g., if we | |
6330 | hit an internal solib event). Re-fetch it. */ | |
6331 | frame = get_current_frame (); | |
6332 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6333 | |
cdaa5b73 PA |
6334 | switch (what.main_action) |
6335 | { | |
6336 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6337 | /* If we hit the breakpoint at longjmp while stepping, we | |
6338 | install a momentary breakpoint at the target of the | |
6339 | jmp_buf. */ | |
186c406b | 6340 | |
cdaa5b73 PA |
6341 | if (debug_infrun) |
6342 | fprintf_unfiltered (gdb_stdlog, | |
6343 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 6344 | |
cdaa5b73 | 6345 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6346 | |
cdaa5b73 PA |
6347 | if (what.is_longjmp) |
6348 | { | |
6349 | struct value *arg_value; | |
6350 | ||
6351 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6352 | then use it to extract the arguments. The destination PC | |
6353 | is the third argument to the probe. */ | |
6354 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6355 | if (arg_value) | |
8fa0c4f8 AA |
6356 | { |
6357 | jmp_buf_pc = value_as_address (arg_value); | |
6358 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6359 | } | |
cdaa5b73 PA |
6360 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6361 | || !gdbarch_get_longjmp_target (gdbarch, | |
6362 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6363 | { |
cdaa5b73 PA |
6364 | if (debug_infrun) |
6365 | fprintf_unfiltered (gdb_stdlog, | |
6366 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
6367 | "(!gdbarch_get_longjmp_target)\n"); | |
6368 | keep_going (ecs); | |
6369 | return; | |
e2e4d78b | 6370 | } |
e2e4d78b | 6371 | |
cdaa5b73 PA |
6372 | /* Insert a breakpoint at resume address. */ |
6373 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6374 | } | |
6375 | else | |
6376 | check_exception_resume (ecs, frame); | |
6377 | keep_going (ecs); | |
6378 | return; | |
e81a37f7 | 6379 | |
cdaa5b73 PA |
6380 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6381 | { | |
6382 | struct frame_info *init_frame; | |
e81a37f7 | 6383 | |
cdaa5b73 | 6384 | /* There are several cases to consider. |
c906108c | 6385 | |
cdaa5b73 PA |
6386 | 1. The initiating frame no longer exists. In this case we |
6387 | must stop, because the exception or longjmp has gone too | |
6388 | far. | |
2c03e5be | 6389 | |
cdaa5b73 PA |
6390 | 2. The initiating frame exists, and is the same as the |
6391 | current frame. We stop, because the exception or longjmp | |
6392 | has been caught. | |
2c03e5be | 6393 | |
cdaa5b73 PA |
6394 | 3. The initiating frame exists and is different from the |
6395 | current frame. This means the exception or longjmp has | |
6396 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6397 | |
cdaa5b73 PA |
6398 | 4. longjmp breakpoint has been placed just to protect |
6399 | against stale dummy frames and user is not interested in | |
6400 | stopping around longjmps. */ | |
c5aa993b | 6401 | |
cdaa5b73 PA |
6402 | if (debug_infrun) |
6403 | fprintf_unfiltered (gdb_stdlog, | |
6404 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 6405 | |
cdaa5b73 PA |
6406 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6407 | != NULL); | |
6408 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6409 | |
cdaa5b73 PA |
6410 | if (what.is_longjmp) |
6411 | { | |
b67a2c6f | 6412 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6413 | |
cdaa5b73 | 6414 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6415 | { |
cdaa5b73 PA |
6416 | /* Case 4. */ |
6417 | keep_going (ecs); | |
6418 | return; | |
e5ef252a | 6419 | } |
cdaa5b73 | 6420 | } |
c5aa993b | 6421 | |
cdaa5b73 | 6422 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6423 | |
cdaa5b73 PA |
6424 | if (init_frame) |
6425 | { | |
6426 | struct frame_id current_id | |
6427 | = get_frame_id (get_current_frame ()); | |
6428 | if (frame_id_eq (current_id, | |
6429 | ecs->event_thread->initiating_frame)) | |
6430 | { | |
6431 | /* Case 2. Fall through. */ | |
6432 | } | |
6433 | else | |
6434 | { | |
6435 | /* Case 3. */ | |
6436 | keep_going (ecs); | |
6437 | return; | |
6438 | } | |
68f53502 | 6439 | } |
488f131b | 6440 | |
cdaa5b73 PA |
6441 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6442 | exists. */ | |
6443 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6444 | |
bdc36728 | 6445 | end_stepping_range (ecs); |
cdaa5b73 PA |
6446 | } |
6447 | return; | |
e5ef252a | 6448 | |
cdaa5b73 PA |
6449 | case BPSTAT_WHAT_SINGLE: |
6450 | if (debug_infrun) | |
6451 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
6452 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6453 | /* Still need to check other stuff, at least the case where we | |
6454 | are stepping and step out of the right range. */ | |
6455 | break; | |
e5ef252a | 6456 | |
cdaa5b73 PA |
6457 | case BPSTAT_WHAT_STEP_RESUME: |
6458 | if (debug_infrun) | |
6459 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 6460 | |
cdaa5b73 PA |
6461 | delete_step_resume_breakpoint (ecs->event_thread); |
6462 | if (ecs->event_thread->control.proceed_to_finish | |
6463 | && execution_direction == EXEC_REVERSE) | |
6464 | { | |
6465 | struct thread_info *tp = ecs->event_thread; | |
6466 | ||
6467 | /* We are finishing a function in reverse, and just hit the | |
6468 | step-resume breakpoint at the start address of the | |
6469 | function, and we're almost there -- just need to back up | |
6470 | by one more single-step, which should take us back to the | |
6471 | function call. */ | |
6472 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6473 | keep_going (ecs); | |
e5ef252a | 6474 | return; |
cdaa5b73 PA |
6475 | } |
6476 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6477 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6478 | && execution_direction == EXEC_REVERSE) |
6479 | { | |
6480 | /* We are stepping over a function call in reverse, and just | |
6481 | hit the step-resume breakpoint at the start address of | |
6482 | the function. Go back to single-stepping, which should | |
6483 | take us back to the function call. */ | |
6484 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6485 | keep_going (ecs); | |
6486 | return; | |
6487 | } | |
6488 | break; | |
e5ef252a | 6489 | |
cdaa5b73 PA |
6490 | case BPSTAT_WHAT_STOP_NOISY: |
6491 | if (debug_infrun) | |
6492 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
6493 | stop_print_frame = 1; | |
e5ef252a | 6494 | |
99619bea PA |
6495 | /* Assume the thread stopped for a breapoint. We'll still check |
6496 | whether a/the breakpoint is there when the thread is next | |
6497 | resumed. */ | |
6498 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6499 | |
22bcd14b | 6500 | stop_waiting (ecs); |
cdaa5b73 | 6501 | return; |
e5ef252a | 6502 | |
cdaa5b73 PA |
6503 | case BPSTAT_WHAT_STOP_SILENT: |
6504 | if (debug_infrun) | |
6505 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
6506 | stop_print_frame = 0; | |
e5ef252a | 6507 | |
99619bea PA |
6508 | /* Assume the thread stopped for a breapoint. We'll still check |
6509 | whether a/the breakpoint is there when the thread is next | |
6510 | resumed. */ | |
6511 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6512 | stop_waiting (ecs); |
cdaa5b73 PA |
6513 | return; |
6514 | ||
6515 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
6516 | if (debug_infrun) | |
6517 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
6518 | ||
6519 | delete_step_resume_breakpoint (ecs->event_thread); | |
6520 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6521 | { | |
6522 | /* Back when the step-resume breakpoint was inserted, we | |
6523 | were trying to single-step off a breakpoint. Go back to | |
6524 | doing that. */ | |
6525 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6526 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6527 | keep_going (ecs); | |
6528 | return; | |
e5ef252a | 6529 | } |
cdaa5b73 PA |
6530 | break; |
6531 | ||
6532 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6533 | break; | |
e5ef252a | 6534 | } |
c906108c | 6535 | |
af48d08f PA |
6536 | /* If we stepped a permanent breakpoint and we had a high priority |
6537 | step-resume breakpoint for the address we stepped, but we didn't | |
6538 | hit it, then we must have stepped into the signal handler. The | |
6539 | step-resume was only necessary to catch the case of _not_ | |
6540 | stepping into the handler, so delete it, and fall through to | |
6541 | checking whether the step finished. */ | |
6542 | if (ecs->event_thread->stepped_breakpoint) | |
6543 | { | |
6544 | struct breakpoint *sr_bp | |
6545 | = ecs->event_thread->control.step_resume_breakpoint; | |
6546 | ||
8d707a12 PA |
6547 | if (sr_bp != NULL |
6548 | && sr_bp->loc->permanent | |
af48d08f PA |
6549 | && sr_bp->type == bp_hp_step_resume |
6550 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6551 | { | |
6552 | if (debug_infrun) | |
6553 | fprintf_unfiltered (gdb_stdlog, | |
6554 | "infrun: stepped permanent breakpoint, stopped in " | |
6555 | "handler\n"); | |
6556 | delete_step_resume_breakpoint (ecs->event_thread); | |
6557 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6558 | } | |
6559 | } | |
6560 | ||
cdaa5b73 PA |
6561 | /* We come here if we hit a breakpoint but should not stop for it. |
6562 | Possibly we also were stepping and should stop for that. So fall | |
6563 | through and test for stepping. But, if not stepping, do not | |
6564 | stop. */ | |
c906108c | 6565 | |
a7212384 UW |
6566 | /* In all-stop mode, if we're currently stepping but have stopped in |
6567 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6568 | if (switch_back_to_stepped_thread (ecs)) |
6569 | return; | |
776f04fa | 6570 | |
8358c15c | 6571 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6572 | { |
527159b7 | 6573 | if (debug_infrun) |
d3169d93 DJ |
6574 | fprintf_unfiltered (gdb_stdlog, |
6575 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 6576 | |
488f131b JB |
6577 | /* Having a step-resume breakpoint overrides anything |
6578 | else having to do with stepping commands until | |
6579 | that breakpoint is reached. */ | |
488f131b JB |
6580 | keep_going (ecs); |
6581 | return; | |
6582 | } | |
c5aa993b | 6583 | |
16c381f0 | 6584 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6585 | { |
527159b7 | 6586 | if (debug_infrun) |
8a9de0e4 | 6587 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 6588 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6589 | keep_going (ecs); |
6590 | return; | |
6591 | } | |
c5aa993b | 6592 | |
4b7703ad JB |
6593 | /* Re-fetch current thread's frame in case the code above caused |
6594 | the frame cache to be re-initialized, making our FRAME variable | |
6595 | a dangling pointer. */ | |
6596 | frame = get_current_frame (); | |
628fe4e4 | 6597 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6598 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6599 | |
488f131b | 6600 | /* If stepping through a line, keep going if still within it. |
c906108c | 6601 | |
488f131b JB |
6602 | Note that step_range_end is the address of the first instruction |
6603 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6604 | within it! |
6605 | ||
6606 | Note also that during reverse execution, we may be stepping | |
6607 | through a function epilogue and therefore must detect when | |
6608 | the current-frame changes in the middle of a line. */ | |
6609 | ||
f2ffa92b PA |
6610 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6611 | ecs->event_thread) | |
31410e84 | 6612 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6613 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6614 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6615 | { |
527159b7 | 6616 | if (debug_infrun) |
5af949e3 UW |
6617 | fprintf_unfiltered |
6618 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
6619 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
6620 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6621 | |
c1e36e3e PA |
6622 | /* Tentatively re-enable range stepping; `resume' disables it if |
6623 | necessary (e.g., if we're stepping over a breakpoint or we | |
6624 | have software watchpoints). */ | |
6625 | ecs->event_thread->control.may_range_step = 1; | |
6626 | ||
b2175913 MS |
6627 | /* When stepping backward, stop at beginning of line range |
6628 | (unless it's the function entry point, in which case | |
6629 | keep going back to the call point). */ | |
f2ffa92b | 6630 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6631 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6632 | && stop_pc != ecs->stop_func_start |
6633 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6634 | end_stepping_range (ecs); |
b2175913 MS |
6635 | else |
6636 | keep_going (ecs); | |
6637 | ||
488f131b JB |
6638 | return; |
6639 | } | |
c5aa993b | 6640 | |
488f131b | 6641 | /* We stepped out of the stepping range. */ |
c906108c | 6642 | |
488f131b | 6643 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6644 | loader dynamic symbol resolution code... |
6645 | ||
6646 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6647 | time loader code and reach the callee's address. | |
6648 | ||
6649 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6650 | the runtime loader code is handled just like any other | |
6651 | undebuggable function call. Now we need only keep stepping | |
6652 | backward through the trampoline code, and that's handled further | |
6653 | down, so there is nothing for us to do here. */ | |
6654 | ||
6655 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6656 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6657 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6658 | { |
4c8c40e6 | 6659 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6660 | gdbarch_skip_solib_resolver (gdbarch, |
6661 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6662 | |
527159b7 | 6663 | if (debug_infrun) |
3e43a32a MS |
6664 | fprintf_unfiltered (gdb_stdlog, |
6665 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 6666 | |
488f131b JB |
6667 | if (pc_after_resolver) |
6668 | { | |
6669 | /* Set up a step-resume breakpoint at the address | |
6670 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6671 | symtab_and_line sr_sal; |
488f131b | 6672 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6673 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6674 | |
a6d9a66e UW |
6675 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6676 | sr_sal, null_frame_id); | |
c5aa993b | 6677 | } |
c906108c | 6678 | |
488f131b JB |
6679 | keep_going (ecs); |
6680 | return; | |
6681 | } | |
c906108c | 6682 | |
1d509aa6 MM |
6683 | /* Step through an indirect branch thunk. */ |
6684 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6685 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6686 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 MM |
6687 | { |
6688 | if (debug_infrun) | |
6689 | fprintf_unfiltered (gdb_stdlog, | |
6690 | "infrun: stepped into indirect branch thunk\n"); | |
6691 | keep_going (ecs); | |
6692 | return; | |
6693 | } | |
6694 | ||
16c381f0 JK |
6695 | if (ecs->event_thread->control.step_range_end != 1 |
6696 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6697 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6698 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6699 | { |
527159b7 | 6700 | if (debug_infrun) |
3e43a32a MS |
6701 | fprintf_unfiltered (gdb_stdlog, |
6702 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 6703 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6704 | a signal trampoline (either by a signal being delivered or by |
6705 | the signal handler returning). Just single-step until the | |
6706 | inferior leaves the trampoline (either by calling the handler | |
6707 | or returning). */ | |
488f131b JB |
6708 | keep_going (ecs); |
6709 | return; | |
6710 | } | |
c906108c | 6711 | |
14132e89 MR |
6712 | /* If we're in the return path from a shared library trampoline, |
6713 | we want to proceed through the trampoline when stepping. */ | |
6714 | /* macro/2012-04-25: This needs to come before the subroutine | |
6715 | call check below as on some targets return trampolines look | |
6716 | like subroutine calls (MIPS16 return thunks). */ | |
6717 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
6718 | ecs->event_thread->suspend.stop_pc, |
6719 | ecs->stop_func_name) | |
14132e89 MR |
6720 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6721 | { | |
6722 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
6723 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6724 | CORE_ADDR real_stop_pc | |
6725 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 MR |
6726 | |
6727 | if (debug_infrun) | |
6728 | fprintf_unfiltered (gdb_stdlog, | |
6729 | "infrun: stepped into solib return tramp\n"); | |
6730 | ||
6731 | /* Only proceed through if we know where it's going. */ | |
6732 | if (real_stop_pc) | |
6733 | { | |
6734 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6735 | symtab_and_line sr_sal; |
14132e89 MR |
6736 | sr_sal.pc = real_stop_pc; |
6737 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6738 | sr_sal.pspace = get_frame_program_space (frame); | |
6739 | ||
6740 | /* Do not specify what the fp should be when we stop since | |
6741 | on some machines the prologue is where the new fp value | |
6742 | is established. */ | |
6743 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6744 | sr_sal, null_frame_id); | |
6745 | ||
6746 | /* Restart without fiddling with the step ranges or | |
6747 | other state. */ | |
6748 | keep_going (ecs); | |
6749 | return; | |
6750 | } | |
6751 | } | |
6752 | ||
c17eaafe DJ |
6753 | /* Check for subroutine calls. The check for the current frame |
6754 | equalling the step ID is not necessary - the check of the | |
6755 | previous frame's ID is sufficient - but it is a common case and | |
6756 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6757 | |
6758 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6759 | being equal, so to get into this block, both the current and | |
6760 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6761 | /* The outer_frame_id check is a heuristic to detect stepping |
6762 | through startup code. If we step over an instruction which | |
6763 | sets the stack pointer from an invalid value to a valid value, | |
6764 | we may detect that as a subroutine call from the mythical | |
6765 | "outermost" function. This could be fixed by marking | |
6766 | outermost frames as !stack_p,code_p,special_p. Then the | |
6767 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6768 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6769 | for more. */ |
edb3359d | 6770 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6771 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6772 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6773 | ecs->event_thread->control.step_stack_frame_id) |
6774 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6775 | outer_frame_id) |
885eeb5b | 6776 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 6777 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 6778 | { |
f2ffa92b | 6779 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 6780 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6781 | |
527159b7 | 6782 | if (debug_infrun) |
8a9de0e4 | 6783 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 6784 | |
b7a084be | 6785 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6786 | { |
6787 | /* I presume that step_over_calls is only 0 when we're | |
6788 | supposed to be stepping at the assembly language level | |
6789 | ("stepi"). Just stop. */ | |
388a8562 | 6790 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6791 | end_stepping_range (ecs); |
95918acb AC |
6792 | return; |
6793 | } | |
8fb3e588 | 6794 | |
388a8562 MS |
6795 | /* Reverse stepping through solib trampolines. */ |
6796 | ||
6797 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6798 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6799 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6800 | || (ecs->stop_func_start == 0 | |
6801 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6802 | { | |
6803 | /* Any solib trampoline code can be handled in reverse | |
6804 | by simply continuing to single-step. We have already | |
6805 | executed the solib function (backwards), and a few | |
6806 | steps will take us back through the trampoline to the | |
6807 | caller. */ | |
6808 | keep_going (ecs); | |
6809 | return; | |
6810 | } | |
6811 | ||
16c381f0 | 6812 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6813 | { |
b2175913 MS |
6814 | /* We're doing a "next". |
6815 | ||
6816 | Normal (forward) execution: set a breakpoint at the | |
6817 | callee's return address (the address at which the caller | |
6818 | will resume). | |
6819 | ||
6820 | Reverse (backward) execution. set the step-resume | |
6821 | breakpoint at the start of the function that we just | |
6822 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6823 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6824 | |
6825 | if (execution_direction == EXEC_REVERSE) | |
6826 | { | |
acf9414f JK |
6827 | /* If we're already at the start of the function, we've either |
6828 | just stepped backward into a single instruction function, | |
6829 | or stepped back out of a signal handler to the first instruction | |
6830 | of the function. Just keep going, which will single-step back | |
6831 | to the caller. */ | |
58c48e72 | 6832 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6833 | { |
acf9414f | 6834 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6835 | symtab_and_line sr_sal; |
acf9414f JK |
6836 | sr_sal.pc = ecs->stop_func_start; |
6837 | sr_sal.pspace = get_frame_program_space (frame); | |
6838 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6839 | sr_sal, null_frame_id); | |
6840 | } | |
b2175913 MS |
6841 | } |
6842 | else | |
568d6575 | 6843 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6844 | |
8567c30f AC |
6845 | keep_going (ecs); |
6846 | return; | |
6847 | } | |
a53c66de | 6848 | |
95918acb | 6849 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6850 | calling routine and the real function), locate the real |
6851 | function. That's what tells us (a) whether we want to step | |
6852 | into it at all, and (b) what prologue we want to run to the | |
6853 | end of, if we do step into it. */ | |
568d6575 | 6854 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6855 | if (real_stop_pc == 0) |
568d6575 | 6856 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6857 | if (real_stop_pc != 0) |
6858 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6859 | |
db5f024e | 6860 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6861 | { |
51abb421 | 6862 | symtab_and_line sr_sal; |
1b2bfbb9 | 6863 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6864 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6865 | |
a6d9a66e UW |
6866 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6867 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6868 | keep_going (ecs); |
6869 | return; | |
1b2bfbb9 RC |
6870 | } |
6871 | ||
95918acb | 6872 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6873 | thinking of stepping into and the function isn't on the skip |
6874 | list, step into it. | |
95918acb | 6875 | |
8fb3e588 AC |
6876 | If there are several symtabs at that PC (e.g. with include |
6877 | files), just want to know whether *any* of them have line | |
6878 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6879 | { |
6880 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6881 | |
95918acb | 6882 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6883 | if (tmp_sal.line != 0 |
85817405 | 6884 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
6885 | tmp_sal) |
6886 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 6887 | { |
b2175913 | 6888 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6889 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6890 | else |
568d6575 | 6891 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6892 | return; |
6893 | } | |
6894 | } | |
6895 | ||
6896 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6897 | set, we stop the step so that the user has a chance to switch |
6898 | in assembly mode. */ | |
16c381f0 | 6899 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6900 | && step_stop_if_no_debug) |
95918acb | 6901 | { |
bdc36728 | 6902 | end_stepping_range (ecs); |
95918acb AC |
6903 | return; |
6904 | } | |
6905 | ||
b2175913 MS |
6906 | if (execution_direction == EXEC_REVERSE) |
6907 | { | |
acf9414f JK |
6908 | /* If we're already at the start of the function, we've either just |
6909 | stepped backward into a single instruction function without line | |
6910 | number info, or stepped back out of a signal handler to the first | |
6911 | instruction of the function without line number info. Just keep | |
6912 | going, which will single-step back to the caller. */ | |
6913 | if (ecs->stop_func_start != stop_pc) | |
6914 | { | |
6915 | /* Set a breakpoint at callee's start address. | |
6916 | From there we can step once and be back in the caller. */ | |
51abb421 | 6917 | symtab_and_line sr_sal; |
acf9414f JK |
6918 | sr_sal.pc = ecs->stop_func_start; |
6919 | sr_sal.pspace = get_frame_program_space (frame); | |
6920 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6921 | sr_sal, null_frame_id); | |
6922 | } | |
b2175913 MS |
6923 | } |
6924 | else | |
6925 | /* Set a breakpoint at callee's return address (the address | |
6926 | at which the caller will resume). */ | |
568d6575 | 6927 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6928 | |
95918acb | 6929 | keep_going (ecs); |
488f131b | 6930 | return; |
488f131b | 6931 | } |
c906108c | 6932 | |
fdd654f3 MS |
6933 | /* Reverse stepping through solib trampolines. */ |
6934 | ||
6935 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6936 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 6937 | { |
f2ffa92b PA |
6938 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6939 | ||
fdd654f3 MS |
6940 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6941 | || (ecs->stop_func_start == 0 | |
6942 | && in_solib_dynsym_resolve_code (stop_pc))) | |
6943 | { | |
6944 | /* Any solib trampoline code can be handled in reverse | |
6945 | by simply continuing to single-step. We have already | |
6946 | executed the solib function (backwards), and a few | |
6947 | steps will take us back through the trampoline to the | |
6948 | caller. */ | |
6949 | keep_going (ecs); | |
6950 | return; | |
6951 | } | |
6952 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
6953 | { | |
6954 | /* Stepped backward into the solib dynsym resolver. | |
6955 | Set a breakpoint at its start and continue, then | |
6956 | one more step will take us out. */ | |
51abb421 | 6957 | symtab_and_line sr_sal; |
fdd654f3 | 6958 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 6959 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
6960 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6961 | sr_sal, null_frame_id); | |
6962 | keep_going (ecs); | |
6963 | return; | |
6964 | } | |
6965 | } | |
6966 | ||
f2ffa92b | 6967 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 6968 | |
1b2bfbb9 RC |
6969 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
6970 | the trampoline processing logic, however, there are some trampolines | |
6971 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 6972 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 6973 | && ecs->stop_func_name == NULL |
2afb61aa | 6974 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 6975 | { |
527159b7 | 6976 | if (debug_infrun) |
3e43a32a MS |
6977 | fprintf_unfiltered (gdb_stdlog, |
6978 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 6979 | |
1b2bfbb9 | 6980 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
6981 | undebuggable function (where there is no debugging information |
6982 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
6983 | inferior stopped). Since we want to skip this kind of code, |
6984 | we keep going until the inferior returns from this | |
14e60db5 DJ |
6985 | function - unless the user has asked us not to (via |
6986 | set step-mode) or we no longer know how to get back | |
6987 | to the call site. */ | |
6988 | if (step_stop_if_no_debug | |
c7ce8faa | 6989 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
6990 | { |
6991 | /* If we have no line number and the step-stop-if-no-debug | |
6992 | is set, we stop the step so that the user has a chance to | |
6993 | switch in assembly mode. */ | |
bdc36728 | 6994 | end_stepping_range (ecs); |
1b2bfbb9 RC |
6995 | return; |
6996 | } | |
6997 | else | |
6998 | { | |
6999 | /* Set a breakpoint at callee's return address (the address | |
7000 | at which the caller will resume). */ | |
568d6575 | 7001 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
7002 | keep_going (ecs); |
7003 | return; | |
7004 | } | |
7005 | } | |
7006 | ||
16c381f0 | 7007 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
7008 | { |
7009 | /* It is stepi or nexti. We always want to stop stepping after | |
7010 | one instruction. */ | |
527159b7 | 7011 | if (debug_infrun) |
8a9de0e4 | 7012 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 7013 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7014 | return; |
7015 | } | |
7016 | ||
2afb61aa | 7017 | if (stop_pc_sal.line == 0) |
488f131b JB |
7018 | { |
7019 | /* We have no line number information. That means to stop | |
7020 | stepping (does this always happen right after one instruction, | |
7021 | when we do "s" in a function with no line numbers, | |
7022 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 7023 | if (debug_infrun) |
8a9de0e4 | 7024 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 7025 | end_stepping_range (ecs); |
488f131b JB |
7026 | return; |
7027 | } | |
c906108c | 7028 | |
edb3359d DJ |
7029 | /* Look for "calls" to inlined functions, part one. If the inline |
7030 | frame machinery detected some skipped call sites, we have entered | |
7031 | a new inline function. */ | |
7032 | ||
7033 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7034 | ecs->event_thread->control.step_frame_id) |
00431a78 | 7035 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 7036 | { |
edb3359d DJ |
7037 | if (debug_infrun) |
7038 | fprintf_unfiltered (gdb_stdlog, | |
7039 | "infrun: stepped into inlined function\n"); | |
7040 | ||
51abb421 | 7041 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 7042 | |
16c381f0 | 7043 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
7044 | { |
7045 | /* For "step", we're going to stop. But if the call site | |
7046 | for this inlined function is on the same source line as | |
7047 | we were previously stepping, go down into the function | |
7048 | first. Otherwise stop at the call site. */ | |
7049 | ||
7050 | if (call_sal.line == ecs->event_thread->current_line | |
7051 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7052 | { |
7053 | step_into_inline_frame (ecs->event_thread); | |
7054 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7055 | { | |
7056 | keep_going (ecs); | |
7057 | return; | |
7058 | } | |
7059 | } | |
edb3359d | 7060 | |
bdc36728 | 7061 | end_stepping_range (ecs); |
edb3359d DJ |
7062 | return; |
7063 | } | |
7064 | else | |
7065 | { | |
7066 | /* For "next", we should stop at the call site if it is on a | |
7067 | different source line. Otherwise continue through the | |
7068 | inlined function. */ | |
7069 | if (call_sal.line == ecs->event_thread->current_line | |
7070 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7071 | keep_going (ecs); | |
7072 | else | |
bdc36728 | 7073 | end_stepping_range (ecs); |
edb3359d DJ |
7074 | return; |
7075 | } | |
7076 | } | |
7077 | ||
7078 | /* Look for "calls" to inlined functions, part two. If we are still | |
7079 | in the same real function we were stepping through, but we have | |
7080 | to go further up to find the exact frame ID, we are stepping | |
7081 | through a more inlined call beyond its call site. */ | |
7082 | ||
7083 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
7084 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7085 | ecs->event_thread->control.step_frame_id) |
edb3359d | 7086 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7087 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
7088 | { |
7089 | if (debug_infrun) | |
7090 | fprintf_unfiltered (gdb_stdlog, | |
7091 | "infrun: stepping through inlined function\n"); | |
7092 | ||
4a4c04f1 BE |
7093 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7094 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7095 | keep_going (ecs); |
7096 | else | |
bdc36728 | 7097 | end_stepping_range (ecs); |
edb3359d DJ |
7098 | return; |
7099 | } | |
7100 | ||
f2ffa92b | 7101 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
7102 | && (ecs->event_thread->current_line != stop_pc_sal.line |
7103 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
7104 | { |
7105 | /* We are at the start of a different line. So stop. Note that | |
7106 | we don't stop if we step into the middle of a different line. | |
7107 | That is said to make things like for (;;) statements work | |
7108 | better. */ | |
527159b7 | 7109 | if (debug_infrun) |
3e43a32a MS |
7110 | fprintf_unfiltered (gdb_stdlog, |
7111 | "infrun: stepped to a different line\n"); | |
bdc36728 | 7112 | end_stepping_range (ecs); |
488f131b JB |
7113 | return; |
7114 | } | |
c906108c | 7115 | |
488f131b | 7116 | /* We aren't done stepping. |
c906108c | 7117 | |
488f131b JB |
7118 | Optimize by setting the stepping range to the line. |
7119 | (We might not be in the original line, but if we entered a | |
7120 | new line in mid-statement, we continue stepping. This makes | |
7121 | things like for(;;) statements work better.) */ | |
c906108c | 7122 | |
16c381f0 JK |
7123 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7124 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7125 | ecs->event_thread->control.may_range_step = 1; |
edb3359d | 7126 | set_step_info (frame, stop_pc_sal); |
488f131b | 7127 | |
527159b7 | 7128 | if (debug_infrun) |
8a9de0e4 | 7129 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 7130 | keep_going (ecs); |
104c1213 JM |
7131 | } |
7132 | ||
c447ac0b PA |
7133 | /* In all-stop mode, if we're currently stepping but have stopped in |
7134 | some other thread, we may need to switch back to the stepped | |
7135 | thread. Returns true we set the inferior running, false if we left | |
7136 | it stopped (and the event needs further processing). */ | |
7137 | ||
7138 | static int | |
7139 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
7140 | { | |
fbea99ea | 7141 | if (!target_is_non_stop_p ()) |
c447ac0b | 7142 | { |
99619bea PA |
7143 | struct thread_info *stepping_thread; |
7144 | ||
7145 | /* If any thread is blocked on some internal breakpoint, and we | |
7146 | simply need to step over that breakpoint to get it going | |
7147 | again, do that first. */ | |
7148 | ||
7149 | /* However, if we see an event for the stepping thread, then we | |
7150 | know all other threads have been moved past their breakpoints | |
7151 | already. Let the caller check whether the step is finished, | |
7152 | etc., before deciding to move it past a breakpoint. */ | |
7153 | if (ecs->event_thread->control.step_range_end != 0) | |
7154 | return 0; | |
7155 | ||
7156 | /* Check if the current thread is blocked on an incomplete | |
7157 | step-over, interrupted by a random signal. */ | |
7158 | if (ecs->event_thread->control.trap_expected | |
7159 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7160 | { |
99619bea PA |
7161 | if (debug_infrun) |
7162 | { | |
7163 | fprintf_unfiltered (gdb_stdlog, | |
7164 | "infrun: need to finish step-over of [%s]\n", | |
a068643d | 7165 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); |
99619bea PA |
7166 | } |
7167 | keep_going (ecs); | |
7168 | return 1; | |
7169 | } | |
2adfaa28 | 7170 | |
99619bea PA |
7171 | /* Check if the current thread is blocked by a single-step |
7172 | breakpoint of another thread. */ | |
7173 | if (ecs->hit_singlestep_breakpoint) | |
7174 | { | |
7175 | if (debug_infrun) | |
7176 | { | |
7177 | fprintf_unfiltered (gdb_stdlog, | |
7178 | "infrun: need to step [%s] over single-step " | |
7179 | "breakpoint\n", | |
a068643d | 7180 | target_pid_to_str (ecs->ptid).c_str ()); |
99619bea PA |
7181 | } |
7182 | keep_going (ecs); | |
7183 | return 1; | |
7184 | } | |
7185 | ||
4d9d9d04 PA |
7186 | /* If this thread needs yet another step-over (e.g., stepping |
7187 | through a delay slot), do it first before moving on to | |
7188 | another thread. */ | |
7189 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7190 | { | |
7191 | if (debug_infrun) | |
7192 | { | |
7193 | fprintf_unfiltered (gdb_stdlog, | |
7194 | "infrun: thread [%s] still needs step-over\n", | |
a068643d | 7195 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); |
4d9d9d04 PA |
7196 | } |
7197 | keep_going (ecs); | |
7198 | return 1; | |
7199 | } | |
70509625 | 7200 | |
483805cf PA |
7201 | /* If scheduler locking applies even if not stepping, there's no |
7202 | need to walk over threads. Above we've checked whether the | |
7203 | current thread is stepping. If some other thread not the | |
7204 | event thread is stepping, then it must be that scheduler | |
7205 | locking is not in effect. */ | |
856e7dd6 | 7206 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
7207 | return 0; |
7208 | ||
4d9d9d04 PA |
7209 | /* Otherwise, we no longer expect a trap in the current thread. |
7210 | Clear the trap_expected flag before switching back -- this is | |
7211 | what keep_going does as well, if we call it. */ | |
7212 | ecs->event_thread->control.trap_expected = 0; | |
7213 | ||
7214 | /* Likewise, clear the signal if it should not be passed. */ | |
7215 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7216 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7217 | ||
7218 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 7219 | step/next/etc. */ |
4d9d9d04 PA |
7220 | if (start_step_over ()) |
7221 | { | |
7222 | prepare_to_wait (ecs); | |
7223 | return 1; | |
7224 | } | |
7225 | ||
7226 | /* Look for the stepping/nexting thread. */ | |
483805cf | 7227 | stepping_thread = NULL; |
4d9d9d04 | 7228 | |
08036331 | 7229 | for (thread_info *tp : all_non_exited_threads ()) |
483805cf | 7230 | { |
f3f8ece4 PA |
7231 | switch_to_thread_no_regs (tp); |
7232 | ||
fbea99ea PA |
7233 | /* Ignore threads of processes the caller is not |
7234 | resuming. */ | |
483805cf | 7235 | if (!sched_multi |
5b6d1e4f PA |
7236 | && (tp->inf->process_target () != ecs->target |
7237 | || tp->inf->pid != ecs->ptid.pid ())) | |
483805cf PA |
7238 | continue; |
7239 | ||
7240 | /* When stepping over a breakpoint, we lock all threads | |
7241 | except the one that needs to move past the breakpoint. | |
7242 | If a non-event thread has this set, the "incomplete | |
7243 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
7244 | if (tp->control.trap_expected) |
7245 | { | |
7246 | internal_error (__FILE__, __LINE__, | |
7247 | "[%s] has inconsistent state: " | |
7248 | "trap_expected=%d\n", | |
a068643d | 7249 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
7250 | tp->control.trap_expected); |
7251 | } | |
483805cf PA |
7252 | |
7253 | /* Did we find the stepping thread? */ | |
7254 | if (tp->control.step_range_end) | |
7255 | { | |
7256 | /* Yep. There should only one though. */ | |
7257 | gdb_assert (stepping_thread == NULL); | |
7258 | ||
7259 | /* The event thread is handled at the top, before we | |
7260 | enter this loop. */ | |
7261 | gdb_assert (tp != ecs->event_thread); | |
7262 | ||
7263 | /* If some thread other than the event thread is | |
7264 | stepping, then scheduler locking can't be in effect, | |
7265 | otherwise we wouldn't have resumed the current event | |
7266 | thread in the first place. */ | |
856e7dd6 | 7267 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
7268 | |
7269 | stepping_thread = tp; | |
7270 | } | |
99619bea PA |
7271 | } |
7272 | ||
483805cf | 7273 | if (stepping_thread != NULL) |
99619bea | 7274 | { |
c447ac0b PA |
7275 | if (debug_infrun) |
7276 | fprintf_unfiltered (gdb_stdlog, | |
7277 | "infrun: switching back to stepped thread\n"); | |
7278 | ||
2ac7589c PA |
7279 | if (keep_going_stepped_thread (stepping_thread)) |
7280 | { | |
7281 | prepare_to_wait (ecs); | |
7282 | return 1; | |
7283 | } | |
7284 | } | |
f3f8ece4 PA |
7285 | |
7286 | switch_to_thread (ecs->event_thread); | |
2ac7589c | 7287 | } |
2adfaa28 | 7288 | |
2ac7589c PA |
7289 | return 0; |
7290 | } | |
2adfaa28 | 7291 | |
2ac7589c PA |
7292 | /* Set a previously stepped thread back to stepping. Returns true on |
7293 | success, false if the resume is not possible (e.g., the thread | |
7294 | vanished). */ | |
7295 | ||
7296 | static int | |
7297 | keep_going_stepped_thread (struct thread_info *tp) | |
7298 | { | |
7299 | struct frame_info *frame; | |
2ac7589c PA |
7300 | struct execution_control_state ecss; |
7301 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7302 | |
2ac7589c PA |
7303 | /* If the stepping thread exited, then don't try to switch back and |
7304 | resume it, which could fail in several different ways depending | |
7305 | on the target. Instead, just keep going. | |
2adfaa28 | 7306 | |
2ac7589c PA |
7307 | We can find a stepping dead thread in the thread list in two |
7308 | cases: | |
2adfaa28 | 7309 | |
2ac7589c PA |
7310 | - The target supports thread exit events, and when the target |
7311 | tries to delete the thread from the thread list, inferior_ptid | |
7312 | pointed at the exiting thread. In such case, calling | |
7313 | delete_thread does not really remove the thread from the list; | |
7314 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7315 | |
2ac7589c PA |
7316 | - The target's debug interface does not support thread exit |
7317 | events, and so we have no idea whatsoever if the previously | |
7318 | stepping thread is still alive. For that reason, we need to | |
7319 | synchronously query the target now. */ | |
2adfaa28 | 7320 | |
00431a78 | 7321 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c PA |
7322 | { |
7323 | if (debug_infrun) | |
7324 | fprintf_unfiltered (gdb_stdlog, | |
7325 | "infrun: not resuming previously " | |
7326 | "stepped thread, it has vanished\n"); | |
7327 | ||
00431a78 | 7328 | delete_thread (tp); |
2ac7589c | 7329 | return 0; |
c447ac0b | 7330 | } |
2ac7589c PA |
7331 | |
7332 | if (debug_infrun) | |
7333 | fprintf_unfiltered (gdb_stdlog, | |
7334 | "infrun: resuming previously stepped thread\n"); | |
7335 | ||
7336 | reset_ecs (ecs, tp); | |
00431a78 | 7337 | switch_to_thread (tp); |
2ac7589c | 7338 | |
f2ffa92b | 7339 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 7340 | frame = get_current_frame (); |
2ac7589c PA |
7341 | |
7342 | /* If the PC of the thread we were trying to single-step has | |
7343 | changed, then that thread has trapped or been signaled, but the | |
7344 | event has not been reported to GDB yet. Re-poll the target | |
7345 | looking for this particular thread's event (i.e. temporarily | |
7346 | enable schedlock) by: | |
7347 | ||
7348 | - setting a break at the current PC | |
7349 | - resuming that particular thread, only (by setting trap | |
7350 | expected) | |
7351 | ||
7352 | This prevents us continuously moving the single-step breakpoint | |
7353 | forward, one instruction at a time, overstepping. */ | |
7354 | ||
f2ffa92b | 7355 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
7356 | { |
7357 | ptid_t resume_ptid; | |
7358 | ||
7359 | if (debug_infrun) | |
7360 | fprintf_unfiltered (gdb_stdlog, | |
7361 | "infrun: expected thread advanced also (%s -> %s)\n", | |
7362 | paddress (target_gdbarch (), tp->prev_pc), | |
f2ffa92b | 7363 | paddress (target_gdbarch (), tp->suspend.stop_pc)); |
2ac7589c PA |
7364 | |
7365 | /* Clear the info of the previous step-over, as it's no longer | |
7366 | valid (if the thread was trying to step over a breakpoint, it | |
7367 | has already succeeded). It's what keep_going would do too, | |
7368 | if we called it. Do this before trying to insert the sss | |
7369 | breakpoint, otherwise if we were previously trying to step | |
7370 | over this exact address in another thread, the breakpoint is | |
7371 | skipped. */ | |
7372 | clear_step_over_info (); | |
7373 | tp->control.trap_expected = 0; | |
7374 | ||
7375 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7376 | get_frame_address_space (frame), | |
f2ffa92b | 7377 | tp->suspend.stop_pc); |
2ac7589c | 7378 | |
372316f1 | 7379 | tp->resumed = 1; |
fbea99ea | 7380 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7381 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7382 | } | |
7383 | else | |
7384 | { | |
7385 | if (debug_infrun) | |
7386 | fprintf_unfiltered (gdb_stdlog, | |
7387 | "infrun: expected thread still hasn't advanced\n"); | |
7388 | ||
7389 | keep_going_pass_signal (ecs); | |
7390 | } | |
7391 | return 1; | |
c447ac0b PA |
7392 | } |
7393 | ||
8b061563 PA |
7394 | /* Is thread TP in the middle of (software or hardware) |
7395 | single-stepping? (Note the result of this function must never be | |
7396 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7397 | |
a289b8f6 | 7398 | static int |
b3444185 | 7399 | currently_stepping (struct thread_info *tp) |
a7212384 | 7400 | { |
8358c15c JK |
7401 | return ((tp->control.step_range_end |
7402 | && tp->control.step_resume_breakpoint == NULL) | |
7403 | || tp->control.trap_expected | |
af48d08f | 7404 | || tp->stepped_breakpoint |
8358c15c | 7405 | || bpstat_should_step ()); |
a7212384 UW |
7406 | } |
7407 | ||
b2175913 MS |
7408 | /* Inferior has stepped into a subroutine call with source code that |
7409 | we should not step over. Do step to the first line of code in | |
7410 | it. */ | |
c2c6d25f JM |
7411 | |
7412 | static void | |
568d6575 UW |
7413 | handle_step_into_function (struct gdbarch *gdbarch, |
7414 | struct execution_control_state *ecs) | |
c2c6d25f | 7415 | { |
7e324e48 GB |
7416 | fill_in_stop_func (gdbarch, ecs); |
7417 | ||
f2ffa92b PA |
7418 | compunit_symtab *cust |
7419 | = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); | |
43f3e411 | 7420 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7421 | ecs->stop_func_start |
7422 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7423 | |
51abb421 | 7424 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7425 | /* Use the step_resume_break to step until the end of the prologue, |
7426 | even if that involves jumps (as it seems to on the vax under | |
7427 | 4.2). */ | |
7428 | /* If the prologue ends in the middle of a source line, continue to | |
7429 | the end of that source line (if it is still within the function). | |
7430 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7431 | if (stop_func_sal.end |
7432 | && stop_func_sal.pc != ecs->stop_func_start | |
7433 | && stop_func_sal.end < ecs->stop_func_end) | |
7434 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7435 | |
2dbd5e30 KB |
7436 | /* Architectures which require breakpoint adjustment might not be able |
7437 | to place a breakpoint at the computed address. If so, the test | |
7438 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7439 | ecs->stop_func_start to an address at which a breakpoint may be | |
7440 | legitimately placed. | |
8fb3e588 | 7441 | |
2dbd5e30 KB |
7442 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7443 | made, GDB will enter an infinite loop when stepping through | |
7444 | optimized code consisting of VLIW instructions which contain | |
7445 | subinstructions corresponding to different source lines. On | |
7446 | FR-V, it's not permitted to place a breakpoint on any but the | |
7447 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7448 | set, GDB will adjust the breakpoint address to the beginning of | |
7449 | the VLIW instruction. Thus, we need to make the corresponding | |
7450 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7451 | |
568d6575 | 7452 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7453 | { |
7454 | ecs->stop_func_start | |
568d6575 | 7455 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7456 | ecs->stop_func_start); |
2dbd5e30 KB |
7457 | } |
7458 | ||
f2ffa92b | 7459 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7460 | { |
7461 | /* We are already there: stop now. */ | |
bdc36728 | 7462 | end_stepping_range (ecs); |
c2c6d25f JM |
7463 | return; |
7464 | } | |
7465 | else | |
7466 | { | |
7467 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7468 | symtab_and_line sr_sal; |
c2c6d25f JM |
7469 | sr_sal.pc = ecs->stop_func_start; |
7470 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7471 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7472 | |
c2c6d25f | 7473 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7474 | some machines the prologue is where the new fp value is |
7475 | established. */ | |
a6d9a66e | 7476 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7477 | |
7478 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7479 | ecs->event_thread->control.step_range_end |
7480 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7481 | } |
7482 | keep_going (ecs); | |
7483 | } | |
d4f3574e | 7484 | |
b2175913 MS |
7485 | /* Inferior has stepped backward into a subroutine call with source |
7486 | code that we should not step over. Do step to the beginning of the | |
7487 | last line of code in it. */ | |
7488 | ||
7489 | static void | |
568d6575 UW |
7490 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7491 | struct execution_control_state *ecs) | |
b2175913 | 7492 | { |
43f3e411 | 7493 | struct compunit_symtab *cust; |
167e4384 | 7494 | struct symtab_and_line stop_func_sal; |
b2175913 | 7495 | |
7e324e48 GB |
7496 | fill_in_stop_func (gdbarch, ecs); |
7497 | ||
f2ffa92b | 7498 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7499 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7500 | ecs->stop_func_start |
7501 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7502 | |
f2ffa92b | 7503 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7504 | |
7505 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7506 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7507 | { |
7508 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7509 | end_stepping_range (ecs); |
b2175913 MS |
7510 | } |
7511 | else | |
7512 | { | |
7513 | /* Else just reset the step range and keep going. | |
7514 | No step-resume breakpoint, they don't work for | |
7515 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7516 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7517 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7518 | keep_going (ecs); |
7519 | } | |
7520 | return; | |
7521 | } | |
7522 | ||
d3169d93 | 7523 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7524 | This is used to both functions and to skip over code. */ |
7525 | ||
7526 | static void | |
2c03e5be PA |
7527 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7528 | struct symtab_and_line sr_sal, | |
7529 | struct frame_id sr_id, | |
7530 | enum bptype sr_type) | |
44cbf7b5 | 7531 | { |
611c83ae PA |
7532 | /* There should never be more than one step-resume or longjmp-resume |
7533 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7534 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7535 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7536 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
7537 | |
7538 | if (debug_infrun) | |
7539 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7540 | "infrun: inserting step-resume breakpoint at %s\n", |
7541 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7542 | |
8358c15c | 7543 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7544 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7545 | } |
7546 | ||
9da8c2a0 | 7547 | void |
2c03e5be PA |
7548 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7549 | struct symtab_and_line sr_sal, | |
7550 | struct frame_id sr_id) | |
7551 | { | |
7552 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7553 | sr_sal, sr_id, | |
7554 | bp_step_resume); | |
44cbf7b5 | 7555 | } |
7ce450bd | 7556 | |
2c03e5be PA |
7557 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7558 | This is used to skip a potential signal handler. | |
7ce450bd | 7559 | |
14e60db5 DJ |
7560 | This is called with the interrupted function's frame. The signal |
7561 | handler, when it returns, will resume the interrupted function at | |
7562 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7563 | |
7564 | static void | |
2c03e5be | 7565 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7566 | { |
f4c1edd8 | 7567 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7568 | |
51abb421 PA |
7569 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7570 | ||
7571 | symtab_and_line sr_sal; | |
568d6575 | 7572 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7573 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7574 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7575 | |
2c03e5be PA |
7576 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7577 | get_stack_frame_id (return_frame), | |
7578 | bp_hp_step_resume); | |
d303a6c7 AC |
7579 | } |
7580 | ||
2c03e5be PA |
7581 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7582 | is used to skip a function after stepping into it (for "next" or if | |
7583 | the called function has no debugging information). | |
14e60db5 DJ |
7584 | |
7585 | The current function has almost always been reached by single | |
7586 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7587 | current function, and the breakpoint will be set at the caller's | |
7588 | resume address. | |
7589 | ||
7590 | This is a separate function rather than reusing | |
2c03e5be | 7591 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7592 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7593 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7594 | |
7595 | static void | |
7596 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7597 | { | |
14e60db5 DJ |
7598 | /* We shouldn't have gotten here if we don't know where the call site |
7599 | is. */ | |
c7ce8faa | 7600 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7601 | |
51abb421 | 7602 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7603 | |
51abb421 | 7604 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7605 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7606 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7607 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7608 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7609 | |
a6d9a66e | 7610 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7611 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7612 | } |
7613 | ||
611c83ae PA |
7614 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7615 | new breakpoint at the target of a jmp_buf. The handling of | |
7616 | longjmp-resume uses the same mechanisms used for handling | |
7617 | "step-resume" breakpoints. */ | |
7618 | ||
7619 | static void | |
a6d9a66e | 7620 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7621 | { |
e81a37f7 TT |
7622 | /* There should never be more than one longjmp-resume breakpoint per |
7623 | thread, so we should never be setting a new | |
611c83ae | 7624 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7625 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
7626 | |
7627 | if (debug_infrun) | |
7628 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7629 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
7630 | paddress (gdbarch, pc)); | |
611c83ae | 7631 | |
e81a37f7 | 7632 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7633 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7634 | } |
7635 | ||
186c406b TT |
7636 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7637 | the exception. The block B is the block of the unwinder debug hook | |
7638 | function. FRAME is the frame corresponding to the call to this | |
7639 | function. SYM is the symbol of the function argument holding the | |
7640 | target PC of the exception. */ | |
7641 | ||
7642 | static void | |
7643 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7644 | const struct block *b, |
186c406b TT |
7645 | struct frame_info *frame, |
7646 | struct symbol *sym) | |
7647 | { | |
a70b8144 | 7648 | try |
186c406b | 7649 | { |
63e43d3a | 7650 | struct block_symbol vsym; |
186c406b TT |
7651 | struct value *value; |
7652 | CORE_ADDR handler; | |
7653 | struct breakpoint *bp; | |
7654 | ||
987012b8 | 7655 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 7656 | b, VAR_DOMAIN); |
63e43d3a | 7657 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7658 | /* If the value was optimized out, revert to the old behavior. */ |
7659 | if (! value_optimized_out (value)) | |
7660 | { | |
7661 | handler = value_as_address (value); | |
7662 | ||
7663 | if (debug_infrun) | |
7664 | fprintf_unfiltered (gdb_stdlog, | |
7665 | "infrun: exception resume at %lx\n", | |
7666 | (unsigned long) handler); | |
7667 | ||
7668 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7669 | handler, |
7670 | bp_exception_resume).release (); | |
c70a6932 JK |
7671 | |
7672 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7673 | frame = NULL; | |
7674 | ||
5d5658a1 | 7675 | bp->thread = tp->global_num; |
186c406b TT |
7676 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7677 | } | |
7678 | } | |
230d2906 | 7679 | catch (const gdb_exception_error &e) |
492d29ea PA |
7680 | { |
7681 | /* We want to ignore errors here. */ | |
7682 | } | |
186c406b TT |
7683 | } |
7684 | ||
28106bc2 SDJ |
7685 | /* A helper for check_exception_resume that sets an |
7686 | exception-breakpoint based on a SystemTap probe. */ | |
7687 | ||
7688 | static void | |
7689 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7690 | const struct bound_probe *probe, |
28106bc2 SDJ |
7691 | struct frame_info *frame) |
7692 | { | |
7693 | struct value *arg_value; | |
7694 | CORE_ADDR handler; | |
7695 | struct breakpoint *bp; | |
7696 | ||
7697 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7698 | if (!arg_value) | |
7699 | return; | |
7700 | ||
7701 | handler = value_as_address (arg_value); | |
7702 | ||
7703 | if (debug_infrun) | |
7704 | fprintf_unfiltered (gdb_stdlog, | |
7705 | "infrun: exception resume at %s\n", | |
6bac7473 | 7706 | paddress (get_objfile_arch (probe->objfile), |
28106bc2 SDJ |
7707 | handler)); |
7708 | ||
7709 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7710 | handler, bp_exception_resume).release (); |
5d5658a1 | 7711 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7712 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7713 | } | |
7714 | ||
186c406b TT |
7715 | /* This is called when an exception has been intercepted. Check to |
7716 | see whether the exception's destination is of interest, and if so, | |
7717 | set an exception resume breakpoint there. */ | |
7718 | ||
7719 | static void | |
7720 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7721 | struct frame_info *frame) |
186c406b | 7722 | { |
729662a5 | 7723 | struct bound_probe probe; |
28106bc2 SDJ |
7724 | struct symbol *func; |
7725 | ||
7726 | /* First see if this exception unwinding breakpoint was set via a | |
7727 | SystemTap probe point. If so, the probe has two arguments: the | |
7728 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7729 | set a breakpoint there. */ | |
6bac7473 | 7730 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7731 | if (probe.prob) |
28106bc2 | 7732 | { |
729662a5 | 7733 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7734 | return; |
7735 | } | |
7736 | ||
7737 | func = get_frame_function (frame); | |
7738 | if (!func) | |
7739 | return; | |
186c406b | 7740 | |
a70b8144 | 7741 | try |
186c406b | 7742 | { |
3977b71f | 7743 | const struct block *b; |
8157b174 | 7744 | struct block_iterator iter; |
186c406b TT |
7745 | struct symbol *sym; |
7746 | int argno = 0; | |
7747 | ||
7748 | /* The exception breakpoint is a thread-specific breakpoint on | |
7749 | the unwinder's debug hook, declared as: | |
7750 | ||
7751 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7752 | ||
7753 | The CFA argument indicates the frame to which control is | |
7754 | about to be transferred. HANDLER is the destination PC. | |
7755 | ||
7756 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7757 | This is not extremely efficient but it avoids issues in gdb | |
7758 | with computing the DWARF CFA, and it also works even in weird | |
7759 | cases such as throwing an exception from inside a signal | |
7760 | handler. */ | |
7761 | ||
7762 | b = SYMBOL_BLOCK_VALUE (func); | |
7763 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7764 | { | |
7765 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7766 | continue; | |
7767 | ||
7768 | if (argno == 0) | |
7769 | ++argno; | |
7770 | else | |
7771 | { | |
7772 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7773 | b, frame, sym); | |
7774 | break; | |
7775 | } | |
7776 | } | |
7777 | } | |
230d2906 | 7778 | catch (const gdb_exception_error &e) |
492d29ea PA |
7779 | { |
7780 | } | |
186c406b TT |
7781 | } |
7782 | ||
104c1213 | 7783 | static void |
22bcd14b | 7784 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7785 | { |
527159b7 | 7786 | if (debug_infrun) |
22bcd14b | 7787 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 7788 | |
cd0fc7c3 SS |
7789 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7790 | ecs->wait_some_more = 0; | |
fbea99ea PA |
7791 | |
7792 | /* If all-stop, but the target is always in non-stop mode, stop all | |
7793 | threads now that we're presenting the stop to the user. */ | |
7794 | if (!non_stop && target_is_non_stop_p ()) | |
7795 | stop_all_threads (); | |
cd0fc7c3 SS |
7796 | } |
7797 | ||
4d9d9d04 PA |
7798 | /* Like keep_going, but passes the signal to the inferior, even if the |
7799 | signal is set to nopass. */ | |
d4f3574e SS |
7800 | |
7801 | static void | |
4d9d9d04 | 7802 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7803 | { |
d7e15655 | 7804 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 7805 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7806 | |
d4f3574e | 7807 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 7808 | ecs->event_thread->prev_pc |
00431a78 | 7809 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 7810 | |
4d9d9d04 | 7811 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7812 | { |
4d9d9d04 PA |
7813 | struct thread_info *tp = ecs->event_thread; |
7814 | ||
7815 | if (debug_infrun) | |
7816 | fprintf_unfiltered (gdb_stdlog, | |
7817 | "infrun: %s has trap_expected set, " | |
7818 | "resuming to collect trap\n", | |
a068643d | 7819 | target_pid_to_str (tp->ptid).c_str ()); |
4d9d9d04 | 7820 | |
a9ba6bae PA |
7821 | /* We haven't yet gotten our trap, and either: intercepted a |
7822 | non-signal event (e.g., a fork); or took a signal which we | |
7823 | are supposed to pass through to the inferior. Simply | |
7824 | continue. */ | |
64ce06e4 | 7825 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7826 | } |
372316f1 PA |
7827 | else if (step_over_info_valid_p ()) |
7828 | { | |
7829 | /* Another thread is stepping over a breakpoint in-line. If | |
7830 | this thread needs a step-over too, queue the request. In | |
7831 | either case, this resume must be deferred for later. */ | |
7832 | struct thread_info *tp = ecs->event_thread; | |
7833 | ||
7834 | if (ecs->hit_singlestep_breakpoint | |
7835 | || thread_still_needs_step_over (tp)) | |
7836 | { | |
7837 | if (debug_infrun) | |
7838 | fprintf_unfiltered (gdb_stdlog, | |
7839 | "infrun: step-over already in progress: " | |
7840 | "step-over for %s deferred\n", | |
a068643d | 7841 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
7842 | thread_step_over_chain_enqueue (tp); |
7843 | } | |
7844 | else | |
7845 | { | |
7846 | if (debug_infrun) | |
7847 | fprintf_unfiltered (gdb_stdlog, | |
7848 | "infrun: step-over in progress: " | |
7849 | "resume of %s deferred\n", | |
a068643d | 7850 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 | 7851 | } |
372316f1 | 7852 | } |
d4f3574e SS |
7853 | else |
7854 | { | |
31e77af2 | 7855 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7856 | int remove_bp; |
7857 | int remove_wps; | |
8d297bbf | 7858 | step_over_what step_what; |
31e77af2 | 7859 | |
d4f3574e | 7860 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7861 | anyway (if we got a signal, the user asked it be passed to |
7862 | the child) | |
7863 | -- or -- | |
7864 | We got our expected trap, but decided we should resume from | |
7865 | it. | |
d4f3574e | 7866 | |
a9ba6bae | 7867 | We're going to run this baby now! |
d4f3574e | 7868 | |
c36b740a VP |
7869 | Note that insert_breakpoints won't try to re-insert |
7870 | already inserted breakpoints. Therefore, we don't | |
7871 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7872 | |
31e77af2 PA |
7873 | /* If we need to step over a breakpoint, and we're not using |
7874 | displaced stepping to do so, insert all breakpoints | |
7875 | (watchpoints, etc.) but the one we're stepping over, step one | |
7876 | instruction, and then re-insert the breakpoint when that step | |
7877 | is finished. */ | |
963f9c80 | 7878 | |
6c4cfb24 PA |
7879 | step_what = thread_still_needs_step_over (ecs->event_thread); |
7880 | ||
963f9c80 | 7881 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
7882 | || (step_what & STEP_OVER_BREAKPOINT)); |
7883 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 7884 | |
cb71640d PA |
7885 | /* We can't use displaced stepping if we need to step past a |
7886 | watchpoint. The instruction copied to the scratch pad would | |
7887 | still trigger the watchpoint. */ | |
7888 | if (remove_bp | |
3fc8eb30 | 7889 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 7890 | { |
a01bda52 | 7891 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
7892 | regcache_read_pc (regcache), remove_wps, |
7893 | ecs->event_thread->global_num); | |
45e8c884 | 7894 | } |
963f9c80 | 7895 | else if (remove_wps) |
21edc42f | 7896 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
7897 | |
7898 | /* If we now need to do an in-line step-over, we need to stop | |
7899 | all other threads. Note this must be done before | |
7900 | insert_breakpoints below, because that removes the breakpoint | |
7901 | we're about to step over, otherwise other threads could miss | |
7902 | it. */ | |
fbea99ea | 7903 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 7904 | stop_all_threads (); |
abbb1732 | 7905 | |
31e77af2 | 7906 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 7907 | try |
31e77af2 PA |
7908 | { |
7909 | insert_breakpoints (); | |
7910 | } | |
230d2906 | 7911 | catch (const gdb_exception_error &e) |
31e77af2 PA |
7912 | { |
7913 | exception_print (gdb_stderr, e); | |
22bcd14b | 7914 | stop_waiting (ecs); |
bdf2a94a | 7915 | clear_step_over_info (); |
31e77af2 | 7916 | return; |
d4f3574e SS |
7917 | } |
7918 | ||
963f9c80 | 7919 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 7920 | |
64ce06e4 | 7921 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
7922 | } |
7923 | ||
488f131b | 7924 | prepare_to_wait (ecs); |
d4f3574e SS |
7925 | } |
7926 | ||
4d9d9d04 PA |
7927 | /* Called when we should continue running the inferior, because the |
7928 | current event doesn't cause a user visible stop. This does the | |
7929 | resuming part; waiting for the next event is done elsewhere. */ | |
7930 | ||
7931 | static void | |
7932 | keep_going (struct execution_control_state *ecs) | |
7933 | { | |
7934 | if (ecs->event_thread->control.trap_expected | |
7935 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
7936 | ecs->event_thread->control.trap_expected = 0; | |
7937 | ||
7938 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7939 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7940 | keep_going_pass_signal (ecs); | |
7941 | } | |
7942 | ||
104c1213 JM |
7943 | /* This function normally comes after a resume, before |
7944 | handle_inferior_event exits. It takes care of any last bits of | |
7945 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 7946 | |
104c1213 JM |
7947 | static void |
7948 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 7949 | { |
527159b7 | 7950 | if (debug_infrun) |
8a9de0e4 | 7951 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 7952 | |
104c1213 | 7953 | ecs->wait_some_more = 1; |
0b333c5e PA |
7954 | |
7955 | if (!target_is_async_p ()) | |
7956 | mark_infrun_async_event_handler (); | |
c906108c | 7957 | } |
11cf8741 | 7958 | |
fd664c91 | 7959 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 7960 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
7961 | |
7962 | static void | |
bdc36728 | 7963 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 7964 | { |
bdc36728 | 7965 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 7966 | stop_waiting (ecs); |
fd664c91 PA |
7967 | } |
7968 | ||
33d62d64 JK |
7969 | /* Several print_*_reason functions to print why the inferior has stopped. |
7970 | We always print something when the inferior exits, or receives a signal. | |
7971 | The rest of the cases are dealt with later on in normal_stop and | |
7972 | print_it_typical. Ideally there should be a call to one of these | |
7973 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 7974 | stop_waiting is called. |
33d62d64 | 7975 | |
fd664c91 PA |
7976 | Note that we don't call these directly, instead we delegate that to |
7977 | the interpreters, through observers. Interpreters then call these | |
7978 | with whatever uiout is right. */ | |
33d62d64 | 7979 | |
fd664c91 PA |
7980 | void |
7981 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 7982 | { |
fd664c91 | 7983 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 7984 | |
112e8700 | 7985 | if (uiout->is_mi_like_p ()) |
fd664c91 | 7986 | { |
112e8700 | 7987 | uiout->field_string ("reason", |
fd664c91 PA |
7988 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
7989 | } | |
7990 | } | |
33d62d64 | 7991 | |
fd664c91 PA |
7992 | void |
7993 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 7994 | { |
33d62d64 | 7995 | annotate_signalled (); |
112e8700 SM |
7996 | if (uiout->is_mi_like_p ()) |
7997 | uiout->field_string | |
7998 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
7999 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 8000 | annotate_signal_name (); |
112e8700 | 8001 | uiout->field_string ("signal-name", |
2ea28649 | 8002 | gdb_signal_to_name (siggnal)); |
33d62d64 | 8003 | annotate_signal_name_end (); |
112e8700 | 8004 | uiout->text (", "); |
33d62d64 | 8005 | annotate_signal_string (); |
112e8700 | 8006 | uiout->field_string ("signal-meaning", |
2ea28649 | 8007 | gdb_signal_to_string (siggnal)); |
33d62d64 | 8008 | annotate_signal_string_end (); |
112e8700 SM |
8009 | uiout->text (".\n"); |
8010 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
8011 | } |
8012 | ||
fd664c91 PA |
8013 | void |
8014 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 8015 | { |
fda326dd | 8016 | struct inferior *inf = current_inferior (); |
a068643d | 8017 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 8018 | |
33d62d64 JK |
8019 | annotate_exited (exitstatus); |
8020 | if (exitstatus) | |
8021 | { | |
112e8700 SM |
8022 | if (uiout->is_mi_like_p ()) |
8023 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
8024 | std::string exit_code_str |
8025 | = string_printf ("0%o", (unsigned int) exitstatus); | |
8026 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
8027 | plongest (inf->num), pidstr.c_str (), | |
8028 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
8029 | } |
8030 | else | |
11cf8741 | 8031 | { |
112e8700 SM |
8032 | if (uiout->is_mi_like_p ()) |
8033 | uiout->field_string | |
8034 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
8035 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
8036 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 8037 | } |
33d62d64 JK |
8038 | } |
8039 | ||
012b3a21 WT |
8040 | /* Some targets/architectures can do extra processing/display of |
8041 | segmentation faults. E.g., Intel MPX boundary faults. | |
8042 | Call the architecture dependent function to handle the fault. */ | |
8043 | ||
8044 | static void | |
8045 | handle_segmentation_fault (struct ui_out *uiout) | |
8046 | { | |
8047 | struct regcache *regcache = get_current_regcache (); | |
ac7936df | 8048 | struct gdbarch *gdbarch = regcache->arch (); |
012b3a21 WT |
8049 | |
8050 | if (gdbarch_handle_segmentation_fault_p (gdbarch)) | |
8051 | gdbarch_handle_segmentation_fault (gdbarch, uiout); | |
8052 | } | |
8053 | ||
fd664c91 PA |
8054 | void |
8055 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 8056 | { |
f303dbd6 PA |
8057 | struct thread_info *thr = inferior_thread (); |
8058 | ||
33d62d64 JK |
8059 | annotate_signal (); |
8060 | ||
112e8700 | 8061 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
8062 | ; |
8063 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 8064 | { |
f303dbd6 | 8065 | const char *name; |
33d62d64 | 8066 | |
112e8700 | 8067 | uiout->text ("\nThread "); |
33eca680 | 8068 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 PA |
8069 | |
8070 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
8071 | if (name != NULL) | |
8072 | { | |
112e8700 | 8073 | uiout->text (" \""); |
33eca680 | 8074 | uiout->field_string ("name", name); |
112e8700 | 8075 | uiout->text ("\""); |
f303dbd6 | 8076 | } |
33d62d64 | 8077 | } |
f303dbd6 | 8078 | else |
112e8700 | 8079 | uiout->text ("\nProgram"); |
f303dbd6 | 8080 | |
112e8700 SM |
8081 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8082 | uiout->text (" stopped"); | |
33d62d64 JK |
8083 | else |
8084 | { | |
112e8700 | 8085 | uiout->text (" received signal "); |
8b93c638 | 8086 | annotate_signal_name (); |
112e8700 SM |
8087 | if (uiout->is_mi_like_p ()) |
8088 | uiout->field_string | |
8089 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8090 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8091 | annotate_signal_name_end (); |
112e8700 | 8092 | uiout->text (", "); |
8b93c638 | 8093 | annotate_signal_string (); |
112e8700 | 8094 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 WT |
8095 | |
8096 | if (siggnal == GDB_SIGNAL_SEGV) | |
8097 | handle_segmentation_fault (uiout); | |
8098 | ||
8b93c638 | 8099 | annotate_signal_string_end (); |
33d62d64 | 8100 | } |
112e8700 | 8101 | uiout->text (".\n"); |
33d62d64 | 8102 | } |
252fbfc8 | 8103 | |
fd664c91 PA |
8104 | void |
8105 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8106 | { |
112e8700 | 8107 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8108 | } |
43ff13b4 | 8109 | |
0c7e1a46 PA |
8110 | /* Print current location without a level number, if we have changed |
8111 | functions or hit a breakpoint. Print source line if we have one. | |
8112 | bpstat_print contains the logic deciding in detail what to print, | |
8113 | based on the event(s) that just occurred. */ | |
8114 | ||
243a9253 PA |
8115 | static void |
8116 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8117 | { |
8118 | int bpstat_ret; | |
f486487f | 8119 | enum print_what source_flag; |
0c7e1a46 PA |
8120 | int do_frame_printing = 1; |
8121 | struct thread_info *tp = inferior_thread (); | |
8122 | ||
8123 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8124 | switch (bpstat_ret) | |
8125 | { | |
8126 | case PRINT_UNKNOWN: | |
8127 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8128 | should) carry around the function and does (or should) use | |
8129 | that when doing a frame comparison. */ | |
8130 | if (tp->control.stop_step | |
8131 | && frame_id_eq (tp->control.step_frame_id, | |
8132 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
8133 | && (tp->control.step_start_function |
8134 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
8135 | { |
8136 | /* Finished step, just print source line. */ | |
8137 | source_flag = SRC_LINE; | |
8138 | } | |
8139 | else | |
8140 | { | |
8141 | /* Print location and source line. */ | |
8142 | source_flag = SRC_AND_LOC; | |
8143 | } | |
8144 | break; | |
8145 | case PRINT_SRC_AND_LOC: | |
8146 | /* Print location and source line. */ | |
8147 | source_flag = SRC_AND_LOC; | |
8148 | break; | |
8149 | case PRINT_SRC_ONLY: | |
8150 | source_flag = SRC_LINE; | |
8151 | break; | |
8152 | case PRINT_NOTHING: | |
8153 | /* Something bogus. */ | |
8154 | source_flag = SRC_LINE; | |
8155 | do_frame_printing = 0; | |
8156 | break; | |
8157 | default: | |
8158 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8159 | } | |
8160 | ||
8161 | /* The behavior of this routine with respect to the source | |
8162 | flag is: | |
8163 | SRC_LINE: Print only source line | |
8164 | LOCATION: Print only location | |
8165 | SRC_AND_LOC: Print location and source line. */ | |
8166 | if (do_frame_printing) | |
8167 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8168 | } |
8169 | ||
243a9253 PA |
8170 | /* See infrun.h. */ |
8171 | ||
8172 | void | |
4c7d57e7 | 8173 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8174 | { |
243a9253 | 8175 | struct target_waitstatus last; |
243a9253 PA |
8176 | struct thread_info *tp; |
8177 | ||
5b6d1e4f | 8178 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8179 | |
67ad9399 TT |
8180 | { |
8181 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8182 | |
67ad9399 | 8183 | print_stop_location (&last); |
243a9253 | 8184 | |
67ad9399 | 8185 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8186 | if (displays) |
8187 | do_displays (); | |
67ad9399 | 8188 | } |
243a9253 PA |
8189 | |
8190 | tp = inferior_thread (); | |
8191 | if (tp->thread_fsm != NULL | |
46e3ed7f | 8192 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
8193 | { |
8194 | struct return_value_info *rv; | |
8195 | ||
46e3ed7f | 8196 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
8197 | if (rv != NULL) |
8198 | print_return_value (uiout, rv); | |
8199 | } | |
0c7e1a46 PA |
8200 | } |
8201 | ||
388a7084 PA |
8202 | /* See infrun.h. */ |
8203 | ||
8204 | void | |
8205 | maybe_remove_breakpoints (void) | |
8206 | { | |
8207 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
8208 | { | |
8209 | if (remove_breakpoints ()) | |
8210 | { | |
223ffa71 | 8211 | target_terminal::ours_for_output (); |
388a7084 PA |
8212 | printf_filtered (_("Cannot remove breakpoints because " |
8213 | "program is no longer writable.\nFurther " | |
8214 | "execution is probably impossible.\n")); | |
8215 | } | |
8216 | } | |
8217 | } | |
8218 | ||
4c2f2a79 PA |
8219 | /* The execution context that just caused a normal stop. */ |
8220 | ||
8221 | struct stop_context | |
8222 | { | |
2d844eaf TT |
8223 | stop_context (); |
8224 | ~stop_context (); | |
8225 | ||
8226 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8227 | ||
8228 | bool changed () const; | |
8229 | ||
4c2f2a79 PA |
8230 | /* The stop ID. */ |
8231 | ULONGEST stop_id; | |
c906108c | 8232 | |
4c2f2a79 | 8233 | /* The event PTID. */ |
c906108c | 8234 | |
4c2f2a79 PA |
8235 | ptid_t ptid; |
8236 | ||
8237 | /* If stopp for a thread event, this is the thread that caused the | |
8238 | stop. */ | |
8239 | struct thread_info *thread; | |
8240 | ||
8241 | /* The inferior that caused the stop. */ | |
8242 | int inf_num; | |
8243 | }; | |
8244 | ||
2d844eaf | 8245 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8246 | takes a strong reference to the thread. */ |
8247 | ||
2d844eaf | 8248 | stop_context::stop_context () |
4c2f2a79 | 8249 | { |
2d844eaf TT |
8250 | stop_id = get_stop_id (); |
8251 | ptid = inferior_ptid; | |
8252 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8253 | |
d7e15655 | 8254 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8255 | { |
8256 | /* Take a strong reference so that the thread can't be deleted | |
8257 | yet. */ | |
2d844eaf TT |
8258 | thread = inferior_thread (); |
8259 | thread->incref (); | |
4c2f2a79 PA |
8260 | } |
8261 | else | |
2d844eaf | 8262 | thread = NULL; |
4c2f2a79 PA |
8263 | } |
8264 | ||
8265 | /* Release a stop context previously created with save_stop_context. | |
8266 | Releases the strong reference to the thread as well. */ | |
8267 | ||
2d844eaf | 8268 | stop_context::~stop_context () |
4c2f2a79 | 8269 | { |
2d844eaf TT |
8270 | if (thread != NULL) |
8271 | thread->decref (); | |
4c2f2a79 PA |
8272 | } |
8273 | ||
8274 | /* Return true if the current context no longer matches the saved stop | |
8275 | context. */ | |
8276 | ||
2d844eaf TT |
8277 | bool |
8278 | stop_context::changed () const | |
8279 | { | |
8280 | if (ptid != inferior_ptid) | |
8281 | return true; | |
8282 | if (inf_num != current_inferior ()->num) | |
8283 | return true; | |
8284 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8285 | return true; | |
8286 | if (get_stop_id () != stop_id) | |
8287 | return true; | |
8288 | return false; | |
4c2f2a79 PA |
8289 | } |
8290 | ||
8291 | /* See infrun.h. */ | |
8292 | ||
8293 | int | |
96baa820 | 8294 | normal_stop (void) |
c906108c | 8295 | { |
73b65bb0 | 8296 | struct target_waitstatus last; |
73b65bb0 | 8297 | |
5b6d1e4f | 8298 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8299 | |
4c2f2a79 PA |
8300 | new_stop_id (); |
8301 | ||
29f49a6a PA |
8302 | /* If an exception is thrown from this point on, make sure to |
8303 | propagate GDB's knowledge of the executing state to the | |
8304 | frontend/user running state. A QUIT is an easy exception to see | |
8305 | here, so do this before any filtered output. */ | |
731f534f | 8306 | |
5b6d1e4f | 8307 | ptid_t finish_ptid = null_ptid; |
731f534f | 8308 | |
c35b1492 | 8309 | if (!non_stop) |
5b6d1e4f | 8310 | finish_ptid = minus_one_ptid; |
e1316e60 PA |
8311 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8312 | || last.kind == TARGET_WAITKIND_EXITED) | |
8313 | { | |
8314 | /* On some targets, we may still have live threads in the | |
8315 | inferior when we get a process exit event. E.g., for | |
8316 | "checkpoint", when the current checkpoint/fork exits, | |
8317 | linux-fork.c automatically switches to another fork from | |
8318 | within target_mourn_inferior. */ | |
731f534f | 8319 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8320 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 PA |
8321 | } |
8322 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5b6d1e4f PA |
8323 | finish_ptid = inferior_ptid; |
8324 | ||
8325 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8326 | if (finish_ptid != null_ptid) | |
8327 | { | |
8328 | maybe_finish_thread_state.emplace | |
8329 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8330 | } | |
29f49a6a | 8331 | |
b57bacec PA |
8332 | /* As we're presenting a stop, and potentially removing breakpoints, |
8333 | update the thread list so we can tell whether there are threads | |
8334 | running on the target. With target remote, for example, we can | |
8335 | only learn about new threads when we explicitly update the thread | |
8336 | list. Do this before notifying the interpreters about signal | |
8337 | stops, end of stepping ranges, etc., so that the "new thread" | |
8338 | output is emitted before e.g., "Program received signal FOO", | |
8339 | instead of after. */ | |
8340 | update_thread_list (); | |
8341 | ||
8342 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 8343 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 8344 | |
c906108c SS |
8345 | /* As with the notification of thread events, we want to delay |
8346 | notifying the user that we've switched thread context until | |
8347 | the inferior actually stops. | |
8348 | ||
73b65bb0 DJ |
8349 | There's no point in saying anything if the inferior has exited. |
8350 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8351 | "received a signal". |
8352 | ||
8353 | Also skip saying anything in non-stop mode. In that mode, as we | |
8354 | don't want GDB to switch threads behind the user's back, to avoid | |
8355 | races where the user is typing a command to apply to thread x, | |
8356 | but GDB switches to thread y before the user finishes entering | |
8357 | the command, fetch_inferior_event installs a cleanup to restore | |
8358 | the current thread back to the thread the user had selected right | |
8359 | after this event is handled, so we're not really switching, only | |
8360 | informing of a stop. */ | |
4f8d22e3 | 8361 | if (!non_stop |
731f534f | 8362 | && previous_inferior_ptid != inferior_ptid |
73b65bb0 DJ |
8363 | && target_has_execution |
8364 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8365 | && last.kind != TARGET_WAITKIND_EXITED |
8366 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8367 | { |
0e454242 | 8368 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8369 | { |
223ffa71 | 8370 | target_terminal::ours_for_output (); |
3b12939d | 8371 | printf_filtered (_("[Switching to %s]\n"), |
a068643d | 8372 | target_pid_to_str (inferior_ptid).c_str ()); |
3b12939d PA |
8373 | annotate_thread_changed (); |
8374 | } | |
39f77062 | 8375 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8376 | } |
c906108c | 8377 | |
0e5bf2a8 PA |
8378 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8379 | { | |
0e454242 | 8380 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8381 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8382 | { | |
223ffa71 | 8383 | target_terminal::ours_for_output (); |
3b12939d PA |
8384 | printf_filtered (_("No unwaited-for children left.\n")); |
8385 | } | |
0e5bf2a8 PA |
8386 | } |
8387 | ||
b57bacec | 8388 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8389 | maybe_remove_breakpoints (); |
c906108c | 8390 | |
c906108c SS |
8391 | /* If an auto-display called a function and that got a signal, |
8392 | delete that auto-display to avoid an infinite recursion. */ | |
8393 | ||
8394 | if (stopped_by_random_signal) | |
8395 | disable_current_display (); | |
8396 | ||
0e454242 | 8397 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8398 | { |
8399 | async_enable_stdin (); | |
8400 | } | |
c906108c | 8401 | |
388a7084 | 8402 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8403 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8404 | |
8405 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8406 | and current location is based on that. Handle the case where the | |
8407 | dummy call is returning after being stopped. E.g. the dummy call | |
8408 | previously hit a breakpoint. (If the dummy call returns | |
8409 | normally, we won't reach here.) Do this before the stop hook is | |
8410 | run, so that it doesn't get to see the temporary dummy frame, | |
8411 | which is not where we'll present the stop. */ | |
8412 | if (has_stack_frames ()) | |
8413 | { | |
8414 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8415 | { | |
8416 | /* Pop the empty frame that contains the stack dummy. This | |
8417 | also restores inferior state prior to the call (struct | |
8418 | infcall_suspend_state). */ | |
8419 | struct frame_info *frame = get_current_frame (); | |
8420 | ||
8421 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8422 | frame_pop (frame); | |
8423 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8424 | does which means there's now no selected frame. */ | |
8425 | } | |
8426 | ||
8427 | select_frame (get_current_frame ()); | |
8428 | ||
8429 | /* Set the current source location. */ | |
8430 | set_current_sal_from_frame (get_current_frame ()); | |
8431 | } | |
dd7e2d2b PA |
8432 | |
8433 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8434 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8435 | if (stop_command != NULL) |
8436 | { | |
2d844eaf | 8437 | stop_context saved_context; |
4c2f2a79 | 8438 | |
a70b8144 | 8439 | try |
bf469271 PA |
8440 | { |
8441 | execute_cmd_pre_hook (stop_command); | |
8442 | } | |
230d2906 | 8443 | catch (const gdb_exception &ex) |
bf469271 PA |
8444 | { |
8445 | exception_fprintf (gdb_stderr, ex, | |
8446 | "Error while running hook_stop:\n"); | |
8447 | } | |
4c2f2a79 PA |
8448 | |
8449 | /* If the stop hook resumes the target, then there's no point in | |
8450 | trying to notify about the previous stop; its context is | |
8451 | gone. Likewise if the command switches thread or inferior -- | |
8452 | the observers would print a stop for the wrong | |
8453 | thread/inferior. */ | |
2d844eaf TT |
8454 | if (saved_context.changed ()) |
8455 | return 1; | |
4c2f2a79 | 8456 | } |
dd7e2d2b | 8457 | |
388a7084 PA |
8458 | /* Notify observers about the stop. This is where the interpreters |
8459 | print the stop event. */ | |
d7e15655 | 8460 | if (inferior_ptid != null_ptid) |
76727919 | 8461 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
388a7084 PA |
8462 | stop_print_frame); |
8463 | else | |
76727919 | 8464 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8465 | |
243a9253 PA |
8466 | annotate_stopped (); |
8467 | ||
48844aa6 PA |
8468 | if (target_has_execution) |
8469 | { | |
8470 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
fe726667 PA |
8471 | && last.kind != TARGET_WAITKIND_EXITED |
8472 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8473 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8474 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8475 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8476 | } |
6c95b8df PA |
8477 | |
8478 | /* Try to get rid of automatically added inferiors that are no | |
8479 | longer needed. Keeping those around slows down things linearly. | |
8480 | Note that this never removes the current inferior. */ | |
8481 | prune_inferiors (); | |
4c2f2a79 PA |
8482 | |
8483 | return 0; | |
c906108c | 8484 | } |
c906108c | 8485 | \f |
c5aa993b | 8486 | int |
96baa820 | 8487 | signal_stop_state (int signo) |
c906108c | 8488 | { |
d6b48e9c | 8489 | return signal_stop[signo]; |
c906108c SS |
8490 | } |
8491 | ||
c5aa993b | 8492 | int |
96baa820 | 8493 | signal_print_state (int signo) |
c906108c SS |
8494 | { |
8495 | return signal_print[signo]; | |
8496 | } | |
8497 | ||
c5aa993b | 8498 | int |
96baa820 | 8499 | signal_pass_state (int signo) |
c906108c SS |
8500 | { |
8501 | return signal_program[signo]; | |
8502 | } | |
8503 | ||
2455069d UW |
8504 | static void |
8505 | signal_cache_update (int signo) | |
8506 | { | |
8507 | if (signo == -1) | |
8508 | { | |
a493e3e2 | 8509 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8510 | signal_cache_update (signo); |
8511 | ||
8512 | return; | |
8513 | } | |
8514 | ||
8515 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8516 | && signal_print[signo] == 0 | |
ab04a2af TT |
8517 | && signal_program[signo] == 1 |
8518 | && signal_catch[signo] == 0); | |
2455069d UW |
8519 | } |
8520 | ||
488f131b | 8521 | int |
7bda5e4a | 8522 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8523 | { |
8524 | int ret = signal_stop[signo]; | |
abbb1732 | 8525 | |
d4f3574e | 8526 | signal_stop[signo] = state; |
2455069d | 8527 | signal_cache_update (signo); |
d4f3574e SS |
8528 | return ret; |
8529 | } | |
8530 | ||
488f131b | 8531 | int |
7bda5e4a | 8532 | signal_print_update (int signo, int state) |
d4f3574e SS |
8533 | { |
8534 | int ret = signal_print[signo]; | |
abbb1732 | 8535 | |
d4f3574e | 8536 | signal_print[signo] = state; |
2455069d | 8537 | signal_cache_update (signo); |
d4f3574e SS |
8538 | return ret; |
8539 | } | |
8540 | ||
488f131b | 8541 | int |
7bda5e4a | 8542 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8543 | { |
8544 | int ret = signal_program[signo]; | |
abbb1732 | 8545 | |
d4f3574e | 8546 | signal_program[signo] = state; |
2455069d | 8547 | signal_cache_update (signo); |
d4f3574e SS |
8548 | return ret; |
8549 | } | |
8550 | ||
ab04a2af TT |
8551 | /* Update the global 'signal_catch' from INFO and notify the |
8552 | target. */ | |
8553 | ||
8554 | void | |
8555 | signal_catch_update (const unsigned int *info) | |
8556 | { | |
8557 | int i; | |
8558 | ||
8559 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8560 | signal_catch[i] = info[i] > 0; | |
8561 | signal_cache_update (-1); | |
adc6a863 | 8562 | target_pass_signals (signal_pass); |
ab04a2af TT |
8563 | } |
8564 | ||
c906108c | 8565 | static void |
96baa820 | 8566 | sig_print_header (void) |
c906108c | 8567 | { |
3e43a32a MS |
8568 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8569 | "to program\tDescription\n")); | |
c906108c SS |
8570 | } |
8571 | ||
8572 | static void | |
2ea28649 | 8573 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8574 | { |
2ea28649 | 8575 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8576 | int name_padding = 13 - strlen (name); |
96baa820 | 8577 | |
c906108c SS |
8578 | if (name_padding <= 0) |
8579 | name_padding = 0; | |
8580 | ||
8581 | printf_filtered ("%s", name); | |
488f131b | 8582 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8583 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8584 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8585 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8586 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8587 | } |
8588 | ||
8589 | /* Specify how various signals in the inferior should be handled. */ | |
8590 | ||
8591 | static void | |
0b39b52e | 8592 | handle_command (const char *args, int from_tty) |
c906108c | 8593 | { |
c906108c | 8594 | int digits, wordlen; |
b926417a | 8595 | int sigfirst, siglast; |
2ea28649 | 8596 | enum gdb_signal oursig; |
c906108c | 8597 | int allsigs; |
c906108c SS |
8598 | |
8599 | if (args == NULL) | |
8600 | { | |
e2e0b3e5 | 8601 | error_no_arg (_("signal to handle")); |
c906108c SS |
8602 | } |
8603 | ||
1777feb0 | 8604 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8605 | |
adc6a863 PA |
8606 | const size_t nsigs = GDB_SIGNAL_LAST; |
8607 | unsigned char sigs[nsigs] {}; | |
c906108c | 8608 | |
1777feb0 | 8609 | /* Break the command line up into args. */ |
c906108c | 8610 | |
773a1edc | 8611 | gdb_argv built_argv (args); |
c906108c SS |
8612 | |
8613 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8614 | actions. Signal numbers and signal names may be interspersed with | |
8615 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8616 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8617 | |
773a1edc | 8618 | for (char *arg : built_argv) |
c906108c | 8619 | { |
773a1edc TT |
8620 | wordlen = strlen (arg); |
8621 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8622 | {; |
8623 | } | |
8624 | allsigs = 0; | |
8625 | sigfirst = siglast = -1; | |
8626 | ||
773a1edc | 8627 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8628 | { |
8629 | /* Apply action to all signals except those used by the | |
1777feb0 | 8630 | debugger. Silently skip those. */ |
c906108c SS |
8631 | allsigs = 1; |
8632 | sigfirst = 0; | |
8633 | siglast = nsigs - 1; | |
8634 | } | |
773a1edc | 8635 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8636 | { |
8637 | SET_SIGS (nsigs, sigs, signal_stop); | |
8638 | SET_SIGS (nsigs, sigs, signal_print); | |
8639 | } | |
773a1edc | 8640 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8641 | { |
8642 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8643 | } | |
773a1edc | 8644 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8645 | { |
8646 | SET_SIGS (nsigs, sigs, signal_print); | |
8647 | } | |
773a1edc | 8648 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8649 | { |
8650 | SET_SIGS (nsigs, sigs, signal_program); | |
8651 | } | |
773a1edc | 8652 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8653 | { |
8654 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8655 | } | |
773a1edc | 8656 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8657 | { |
8658 | SET_SIGS (nsigs, sigs, signal_program); | |
8659 | } | |
773a1edc | 8660 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8661 | { |
8662 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8663 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8664 | } | |
773a1edc | 8665 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8666 | { |
8667 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8668 | } | |
8669 | else if (digits > 0) | |
8670 | { | |
8671 | /* It is numeric. The numeric signal refers to our own | |
8672 | internal signal numbering from target.h, not to host/target | |
8673 | signal number. This is a feature; users really should be | |
8674 | using symbolic names anyway, and the common ones like | |
8675 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8676 | ||
8677 | sigfirst = siglast = (int) | |
773a1edc TT |
8678 | gdb_signal_from_command (atoi (arg)); |
8679 | if (arg[digits] == '-') | |
c906108c SS |
8680 | { |
8681 | siglast = (int) | |
773a1edc | 8682 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8683 | } |
8684 | if (sigfirst > siglast) | |
8685 | { | |
1777feb0 | 8686 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8687 | std::swap (sigfirst, siglast); |
c906108c SS |
8688 | } |
8689 | } | |
8690 | else | |
8691 | { | |
773a1edc | 8692 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8693 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8694 | { |
8695 | sigfirst = siglast = (int) oursig; | |
8696 | } | |
8697 | else | |
8698 | { | |
8699 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8700 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8701 | } |
8702 | } | |
8703 | ||
8704 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8705 | which signals to apply actions to. */ |
c906108c | 8706 | |
b926417a | 8707 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8708 | { |
2ea28649 | 8709 | switch ((enum gdb_signal) signum) |
c906108c | 8710 | { |
a493e3e2 PA |
8711 | case GDB_SIGNAL_TRAP: |
8712 | case GDB_SIGNAL_INT: | |
c906108c SS |
8713 | if (!allsigs && !sigs[signum]) |
8714 | { | |
9e2f0ad4 | 8715 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8716 | Are you sure you want to change it? "), |
2ea28649 | 8717 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8718 | { |
8719 | sigs[signum] = 1; | |
8720 | } | |
8721 | else | |
c119e040 | 8722 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8723 | } |
8724 | break; | |
a493e3e2 PA |
8725 | case GDB_SIGNAL_0: |
8726 | case GDB_SIGNAL_DEFAULT: | |
8727 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8728 | /* Make sure that "all" doesn't print these. */ |
8729 | break; | |
8730 | default: | |
8731 | sigs[signum] = 1; | |
8732 | break; | |
8733 | } | |
8734 | } | |
c906108c SS |
8735 | } |
8736 | ||
b926417a | 8737 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8738 | if (sigs[signum]) |
8739 | { | |
2455069d | 8740 | signal_cache_update (-1); |
adc6a863 PA |
8741 | target_pass_signals (signal_pass); |
8742 | target_program_signals (signal_program); | |
c906108c | 8743 | |
3a031f65 PA |
8744 | if (from_tty) |
8745 | { | |
8746 | /* Show the results. */ | |
8747 | sig_print_header (); | |
8748 | for (; signum < nsigs; signum++) | |
8749 | if (sigs[signum]) | |
aead7601 | 8750 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8751 | } |
8752 | ||
8753 | break; | |
8754 | } | |
c906108c SS |
8755 | } |
8756 | ||
de0bea00 MF |
8757 | /* Complete the "handle" command. */ |
8758 | ||
eb3ff9a5 | 8759 | static void |
de0bea00 | 8760 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8761 | completion_tracker &tracker, |
6f937416 | 8762 | const char *text, const char *word) |
de0bea00 | 8763 | { |
de0bea00 MF |
8764 | static const char * const keywords[] = |
8765 | { | |
8766 | "all", | |
8767 | "stop", | |
8768 | "ignore", | |
8769 | "print", | |
8770 | "pass", | |
8771 | "nostop", | |
8772 | "noignore", | |
8773 | "noprint", | |
8774 | "nopass", | |
8775 | NULL, | |
8776 | }; | |
8777 | ||
eb3ff9a5 PA |
8778 | signal_completer (ignore, tracker, text, word); |
8779 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8780 | } |
8781 | ||
2ea28649 PA |
8782 | enum gdb_signal |
8783 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8784 | { |
8785 | if (num >= 1 && num <= 15) | |
2ea28649 | 8786 | return (enum gdb_signal) num; |
ed01b82c PA |
8787 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8788 | Use \"info signals\" for a list of symbolic signals.")); | |
8789 | } | |
8790 | ||
c906108c SS |
8791 | /* Print current contents of the tables set by the handle command. |
8792 | It is possible we should just be printing signals actually used | |
8793 | by the current target (but for things to work right when switching | |
8794 | targets, all signals should be in the signal tables). */ | |
8795 | ||
8796 | static void | |
1d12d88f | 8797 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8798 | { |
2ea28649 | 8799 | enum gdb_signal oursig; |
abbb1732 | 8800 | |
c906108c SS |
8801 | sig_print_header (); |
8802 | ||
8803 | if (signum_exp) | |
8804 | { | |
8805 | /* First see if this is a symbol name. */ | |
2ea28649 | 8806 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8807 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8808 | { |
8809 | /* No, try numeric. */ | |
8810 | oursig = | |
2ea28649 | 8811 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8812 | } |
8813 | sig_print_info (oursig); | |
8814 | return; | |
8815 | } | |
8816 | ||
8817 | printf_filtered ("\n"); | |
8818 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8819 | for (oursig = GDB_SIGNAL_FIRST; |
8820 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8821 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8822 | { |
8823 | QUIT; | |
8824 | ||
a493e3e2 PA |
8825 | if (oursig != GDB_SIGNAL_UNKNOWN |
8826 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8827 | sig_print_info (oursig); |
8828 | } | |
8829 | ||
3e43a32a MS |
8830 | printf_filtered (_("\nUse the \"handle\" command " |
8831 | "to change these tables.\n")); | |
c906108c | 8832 | } |
4aa995e1 PA |
8833 | |
8834 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8835 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8836 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8837 | also dependent on which thread you have selected. |
8838 | ||
8839 | 1. making $_siginfo be an internalvar that creates a new value on | |
8840 | access. | |
8841 | ||
8842 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8843 | ||
8844 | /* This function implements the lval_computed support for reading a | |
8845 | $_siginfo value. */ | |
8846 | ||
8847 | static void | |
8848 | siginfo_value_read (struct value *v) | |
8849 | { | |
8850 | LONGEST transferred; | |
8851 | ||
a911d87a PA |
8852 | /* If we can access registers, so can we access $_siginfo. Likewise |
8853 | vice versa. */ | |
8854 | validate_registers_access (); | |
c709acd1 | 8855 | |
4aa995e1 | 8856 | transferred = |
8b88a78e | 8857 | target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, |
4aa995e1 PA |
8858 | NULL, |
8859 | value_contents_all_raw (v), | |
8860 | value_offset (v), | |
8861 | TYPE_LENGTH (value_type (v))); | |
8862 | ||
8863 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8864 | error (_("Unable to read siginfo")); | |
8865 | } | |
8866 | ||
8867 | /* This function implements the lval_computed support for writing a | |
8868 | $_siginfo value. */ | |
8869 | ||
8870 | static void | |
8871 | siginfo_value_write (struct value *v, struct value *fromval) | |
8872 | { | |
8873 | LONGEST transferred; | |
8874 | ||
a911d87a PA |
8875 | /* If we can access registers, so can we access $_siginfo. Likewise |
8876 | vice versa. */ | |
8877 | validate_registers_access (); | |
c709acd1 | 8878 | |
8b88a78e | 8879 | transferred = target_write (current_top_target (), |
4aa995e1 PA |
8880 | TARGET_OBJECT_SIGNAL_INFO, |
8881 | NULL, | |
8882 | value_contents_all_raw (fromval), | |
8883 | value_offset (v), | |
8884 | TYPE_LENGTH (value_type (fromval))); | |
8885 | ||
8886 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
8887 | error (_("Unable to write siginfo")); | |
8888 | } | |
8889 | ||
c8f2448a | 8890 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
8891 | { |
8892 | siginfo_value_read, | |
8893 | siginfo_value_write | |
8894 | }; | |
8895 | ||
8896 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
8897 | the current thread using architecture GDBARCH. Return a void value |
8898 | if there's no object available. */ | |
4aa995e1 | 8899 | |
2c0b251b | 8900 | static struct value * |
22d2b532 SDJ |
8901 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
8902 | void *ignore) | |
4aa995e1 | 8903 | { |
4aa995e1 | 8904 | if (target_has_stack |
d7e15655 | 8905 | && inferior_ptid != null_ptid |
78267919 | 8906 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 8907 | { |
78267919 | 8908 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 8909 | |
78267919 | 8910 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
8911 | } |
8912 | ||
78267919 | 8913 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
8914 | } |
8915 | ||
c906108c | 8916 | \f |
16c381f0 JK |
8917 | /* infcall_suspend_state contains state about the program itself like its |
8918 | registers and any signal it received when it last stopped. | |
8919 | This state must be restored regardless of how the inferior function call | |
8920 | ends (either successfully, or after it hits a breakpoint or signal) | |
8921 | if the program is to properly continue where it left off. */ | |
8922 | ||
6bf78e29 | 8923 | class infcall_suspend_state |
7a292a7a | 8924 | { |
6bf78e29 AB |
8925 | public: |
8926 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
8927 | once the inferior function call has finished. */ | |
8928 | infcall_suspend_state (struct gdbarch *gdbarch, | |
8929 | const struct thread_info *tp, | |
8930 | struct regcache *regcache) | |
8931 | : m_thread_suspend (tp->suspend), | |
8932 | m_registers (new readonly_detached_regcache (*regcache)) | |
8933 | { | |
8934 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
8935 | ||
8936 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
8937 | { | |
8938 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8939 | size_t len = TYPE_LENGTH (type); | |
8940 | ||
8941 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); | |
8942 | ||
8943 | if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8944 | siginfo_data.get (), 0, len) != len) | |
8945 | { | |
8946 | /* Errors ignored. */ | |
8947 | siginfo_data.reset (nullptr); | |
8948 | } | |
8949 | } | |
8950 | ||
8951 | if (siginfo_data) | |
8952 | { | |
8953 | m_siginfo_gdbarch = gdbarch; | |
8954 | m_siginfo_data = std::move (siginfo_data); | |
8955 | } | |
8956 | } | |
8957 | ||
8958 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 8959 | |
6bf78e29 AB |
8960 | readonly_detached_regcache *registers () const |
8961 | { | |
8962 | return m_registers.get (); | |
8963 | } | |
8964 | ||
8965 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
8966 | ||
8967 | void restore (struct gdbarch *gdbarch, | |
8968 | struct thread_info *tp, | |
8969 | struct regcache *regcache) const | |
8970 | { | |
8971 | tp->suspend = m_thread_suspend; | |
8972 | ||
8973 | if (m_siginfo_gdbarch == gdbarch) | |
8974 | { | |
8975 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
8976 | ||
8977 | /* Errors ignored. */ | |
8978 | target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
8979 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); | |
8980 | } | |
8981 | ||
8982 | /* The inferior can be gone if the user types "print exit(0)" | |
8983 | (and perhaps other times). */ | |
8984 | if (target_has_execution) | |
8985 | /* NB: The register write goes through to the target. */ | |
8986 | regcache->restore (registers ()); | |
8987 | } | |
8988 | ||
8989 | private: | |
8990 | /* How the current thread stopped before the inferior function call was | |
8991 | executed. */ | |
8992 | struct thread_suspend_state m_thread_suspend; | |
8993 | ||
8994 | /* The registers before the inferior function call was executed. */ | |
8995 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 8996 | |
35515841 | 8997 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 8998 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
8999 | |
9000 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
9001 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
9002 | content would be invalid. */ | |
6bf78e29 | 9003 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
9004 | }; |
9005 | ||
cb524840 TT |
9006 | infcall_suspend_state_up |
9007 | save_infcall_suspend_state () | |
b89667eb | 9008 | { |
b89667eb | 9009 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 9010 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9011 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 9012 | |
6bf78e29 AB |
9013 | infcall_suspend_state_up inf_state |
9014 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 9015 | |
6bf78e29 AB |
9016 | /* Having saved the current state, adjust the thread state, discarding |
9017 | any stop signal information. The stop signal is not useful when | |
9018 | starting an inferior function call, and run_inferior_call will not use | |
9019 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 9020 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 9021 | |
b89667eb DE |
9022 | return inf_state; |
9023 | } | |
9024 | ||
9025 | /* Restore inferior session state to INF_STATE. */ | |
9026 | ||
9027 | void | |
16c381f0 | 9028 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
9029 | { |
9030 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 9031 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9032 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 9033 | |
6bf78e29 | 9034 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 9035 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
9036 | } |
9037 | ||
b89667eb | 9038 | void |
16c381f0 | 9039 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 9040 | { |
dd848631 | 9041 | delete inf_state; |
b89667eb DE |
9042 | } |
9043 | ||
daf6667d | 9044 | readonly_detached_regcache * |
16c381f0 | 9045 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 9046 | { |
6bf78e29 | 9047 | return inf_state->registers (); |
b89667eb DE |
9048 | } |
9049 | ||
16c381f0 JK |
9050 | /* infcall_control_state contains state regarding gdb's control of the |
9051 | inferior itself like stepping control. It also contains session state like | |
9052 | the user's currently selected frame. */ | |
b89667eb | 9053 | |
16c381f0 | 9054 | struct infcall_control_state |
b89667eb | 9055 | { |
16c381f0 JK |
9056 | struct thread_control_state thread_control; |
9057 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
9058 | |
9059 | /* Other fields: */ | |
ee841dd8 TT |
9060 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
9061 | int stopped_by_random_signal = 0; | |
7a292a7a | 9062 | |
b89667eb | 9063 | /* ID if the selected frame when the inferior function call was made. */ |
ee841dd8 | 9064 | struct frame_id selected_frame_id {}; |
7a292a7a SS |
9065 | }; |
9066 | ||
c906108c | 9067 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9068 | connection. */ |
c906108c | 9069 | |
cb524840 TT |
9070 | infcall_control_state_up |
9071 | save_infcall_control_state () | |
c906108c | 9072 | { |
cb524840 | 9073 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9074 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9075 | struct inferior *inf = current_inferior (); |
7a292a7a | 9076 | |
16c381f0 JK |
9077 | inf_status->thread_control = tp->control; |
9078 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9079 | |
8358c15c | 9080 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9081 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9082 | |
16c381f0 JK |
9083 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9084 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9085 | hand them back the original chain when restore_infcall_control_state is | |
9086 | called. */ | |
9087 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9088 | |
9089 | /* Other fields: */ | |
9090 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9091 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9092 | |
206415a3 | 9093 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 9094 | |
7a292a7a | 9095 | return inf_status; |
c906108c SS |
9096 | } |
9097 | ||
bf469271 PA |
9098 | static void |
9099 | restore_selected_frame (const frame_id &fid) | |
c906108c | 9100 | { |
bf469271 | 9101 | frame_info *frame = frame_find_by_id (fid); |
c906108c | 9102 | |
aa0cd9c1 AC |
9103 | /* If inf_status->selected_frame_id is NULL, there was no previously |
9104 | selected frame. */ | |
101dcfbe | 9105 | if (frame == NULL) |
c906108c | 9106 | { |
8a3fe4f8 | 9107 | warning (_("Unable to restore previously selected frame.")); |
bf469271 | 9108 | return; |
c906108c SS |
9109 | } |
9110 | ||
0f7d239c | 9111 | select_frame (frame); |
c906108c SS |
9112 | } |
9113 | ||
b89667eb DE |
9114 | /* Restore inferior session state to INF_STATUS. */ |
9115 | ||
c906108c | 9116 | void |
16c381f0 | 9117 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9118 | { |
4e1c45ea | 9119 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9120 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9121 | |
8358c15c JK |
9122 | if (tp->control.step_resume_breakpoint) |
9123 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9124 | ||
5b79abe7 TT |
9125 | if (tp->control.exception_resume_breakpoint) |
9126 | tp->control.exception_resume_breakpoint->disposition | |
9127 | = disp_del_at_next_stop; | |
9128 | ||
d82142e2 | 9129 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9130 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9131 | |
16c381f0 JK |
9132 | tp->control = inf_status->thread_control; |
9133 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9134 | |
9135 | /* Other fields: */ | |
9136 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9137 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9138 | |
b89667eb | 9139 | if (target_has_stack) |
c906108c | 9140 | { |
bf469271 | 9141 | /* The point of the try/catch is that if the stack is clobbered, |
101dcfbe AC |
9142 | walking the stack might encounter a garbage pointer and |
9143 | error() trying to dereference it. */ | |
a70b8144 | 9144 | try |
bf469271 PA |
9145 | { |
9146 | restore_selected_frame (inf_status->selected_frame_id); | |
9147 | } | |
230d2906 | 9148 | catch (const gdb_exception_error &ex) |
bf469271 PA |
9149 | { |
9150 | exception_fprintf (gdb_stderr, ex, | |
9151 | "Unable to restore previously selected frame:\n"); | |
9152 | /* Error in restoring the selected frame. Select the | |
9153 | innermost frame. */ | |
9154 | select_frame (get_current_frame ()); | |
9155 | } | |
c906108c | 9156 | } |
c906108c | 9157 | |
ee841dd8 | 9158 | delete inf_status; |
7a292a7a | 9159 | } |
c906108c SS |
9160 | |
9161 | void | |
16c381f0 | 9162 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9163 | { |
8358c15c JK |
9164 | if (inf_status->thread_control.step_resume_breakpoint) |
9165 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9166 | = disp_del_at_next_stop; | |
9167 | ||
5b79abe7 TT |
9168 | if (inf_status->thread_control.exception_resume_breakpoint) |
9169 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9170 | = disp_del_at_next_stop; | |
9171 | ||
1777feb0 | 9172 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9173 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9174 | |
ee841dd8 | 9175 | delete inf_status; |
7a292a7a | 9176 | } |
b89667eb | 9177 | \f |
7f89fd65 | 9178 | /* See infrun.h. */ |
0c557179 SDJ |
9179 | |
9180 | void | |
9181 | clear_exit_convenience_vars (void) | |
9182 | { | |
9183 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9184 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9185 | } | |
c5aa993b | 9186 | \f |
488f131b | 9187 | |
b2175913 MS |
9188 | /* User interface for reverse debugging: |
9189 | Set exec-direction / show exec-direction commands | |
9190 | (returns error unless target implements to_set_exec_direction method). */ | |
9191 | ||
170742de | 9192 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9193 | static const char exec_forward[] = "forward"; |
9194 | static const char exec_reverse[] = "reverse"; | |
9195 | static const char *exec_direction = exec_forward; | |
40478521 | 9196 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9197 | exec_forward, |
9198 | exec_reverse, | |
9199 | NULL | |
9200 | }; | |
9201 | ||
9202 | static void | |
eb4c3f4a | 9203 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9204 | struct cmd_list_element *cmd) |
9205 | { | |
9206 | if (target_can_execute_reverse) | |
9207 | { | |
9208 | if (!strcmp (exec_direction, exec_forward)) | |
9209 | execution_direction = EXEC_FORWARD; | |
9210 | else if (!strcmp (exec_direction, exec_reverse)) | |
9211 | execution_direction = EXEC_REVERSE; | |
9212 | } | |
8bbed405 MS |
9213 | else |
9214 | { | |
9215 | exec_direction = exec_forward; | |
9216 | error (_("Target does not support this operation.")); | |
9217 | } | |
b2175913 MS |
9218 | } |
9219 | ||
9220 | static void | |
9221 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9222 | struct cmd_list_element *cmd, const char *value) | |
9223 | { | |
9224 | switch (execution_direction) { | |
9225 | case EXEC_FORWARD: | |
9226 | fprintf_filtered (out, _("Forward.\n")); | |
9227 | break; | |
9228 | case EXEC_REVERSE: | |
9229 | fprintf_filtered (out, _("Reverse.\n")); | |
9230 | break; | |
b2175913 | 9231 | default: |
d8b34453 PA |
9232 | internal_error (__FILE__, __LINE__, |
9233 | _("bogus execution_direction value: %d"), | |
9234 | (int) execution_direction); | |
b2175913 MS |
9235 | } |
9236 | } | |
9237 | ||
d4db2f36 PA |
9238 | static void |
9239 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9240 | struct cmd_list_element *c, const char *value) | |
9241 | { | |
3e43a32a MS |
9242 | fprintf_filtered (file, _("Resuming the execution of threads " |
9243 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9244 | } |
ad52ddc6 | 9245 | |
22d2b532 SDJ |
9246 | /* Implementation of `siginfo' variable. */ |
9247 | ||
9248 | static const struct internalvar_funcs siginfo_funcs = | |
9249 | { | |
9250 | siginfo_make_value, | |
9251 | NULL, | |
9252 | NULL | |
9253 | }; | |
9254 | ||
372316f1 PA |
9255 | /* Callback for infrun's target events source. This is marked when a |
9256 | thread has a pending status to process. */ | |
9257 | ||
9258 | static void | |
9259 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9260 | { | |
372316f1 PA |
9261 | inferior_event_handler (INF_REG_EVENT, NULL); |
9262 | } | |
9263 | ||
c906108c | 9264 | void |
96baa820 | 9265 | _initialize_infrun (void) |
c906108c | 9266 | { |
de0bea00 | 9267 | struct cmd_list_element *c; |
c906108c | 9268 | |
372316f1 PA |
9269 | /* Register extra event sources in the event loop. */ |
9270 | infrun_async_inferior_event_token | |
9271 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
9272 | ||
11db9430 | 9273 | add_info ("signals", info_signals_command, _("\ |
1bedd215 AC |
9274 | What debugger does when program gets various signals.\n\ |
9275 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9276 | add_info_alias ("handle", "signals", 0); |
9277 | ||
de0bea00 | 9278 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9279 | Specify how to handle signals.\n\ |
486c7739 | 9280 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9281 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9282 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9283 | will be displayed instead.\n\ |
9284 | \n\ | |
c906108c SS |
9285 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9286 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9287 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9288 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9289 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9290 | \n\ |
1bedd215 | 9291 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9292 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9293 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9294 | Print means print a message if this signal happens.\n\ | |
9295 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9296 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9297 | Pass and Stop may be combined.\n\ |
9298 | \n\ | |
9299 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9300 | may be interspersed with actions, with the actions being performed for\n\ | |
9301 | all signals cumulatively specified.")); | |
de0bea00 | 9302 | set_cmd_completer (c, handle_completer); |
486c7739 | 9303 | |
c906108c | 9304 | if (!dbx_commands) |
1a966eab AC |
9305 | stop_command = add_cmd ("stop", class_obscure, |
9306 | not_just_help_class_command, _("\ | |
9307 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9308 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9309 | of the program stops."), &cmdlist); |
c906108c | 9310 | |
ccce17b0 | 9311 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9312 | Set inferior debugging."), _("\ |
9313 | Show inferior debugging."), _("\ | |
9314 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9315 | NULL, |
9316 | show_debug_infrun, | |
9317 | &setdebuglist, &showdebuglist); | |
527159b7 | 9318 | |
3e43a32a MS |
9319 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9320 | &debug_displaced, _("\ | |
237fc4c9 PA |
9321 | Set displaced stepping debugging."), _("\ |
9322 | Show displaced stepping debugging."), _("\ | |
9323 | When non-zero, displaced stepping specific debugging is enabled."), | |
9324 | NULL, | |
9325 | show_debug_displaced, | |
9326 | &setdebuglist, &showdebuglist); | |
9327 | ||
ad52ddc6 PA |
9328 | add_setshow_boolean_cmd ("non-stop", no_class, |
9329 | &non_stop_1, _("\ | |
9330 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9331 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9332 | When debugging a multi-threaded program and this setting is\n\ | |
9333 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9334 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9335 | all other threads in the program while you interact with the thread of\n\ | |
9336 | interest. When you continue or step a thread, you can allow the other\n\ | |
9337 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9338 | thread's state, all threads stop.\n\ | |
9339 | \n\ | |
9340 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9341 | to run freely. You'll be able to step each thread independently,\n\ | |
9342 | leave it stopped or free to run as needed."), | |
9343 | set_non_stop, | |
9344 | show_non_stop, | |
9345 | &setlist, | |
9346 | &showlist); | |
9347 | ||
adc6a863 | 9348 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9349 | { |
9350 | signal_stop[i] = 1; | |
9351 | signal_print[i] = 1; | |
9352 | signal_program[i] = 1; | |
ab04a2af | 9353 | signal_catch[i] = 0; |
c906108c SS |
9354 | } |
9355 | ||
4d9d9d04 PA |
9356 | /* Signals caused by debugger's own actions should not be given to |
9357 | the program afterwards. | |
9358 | ||
9359 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9360 | explicitly specifies that it should be delivered to the target | |
9361 | program. Typically, that would occur when a user is debugging a | |
9362 | target monitor on a simulator: the target monitor sets a | |
9363 | breakpoint; the simulator encounters this breakpoint and halts | |
9364 | the simulation handing control to GDB; GDB, noting that the stop | |
9365 | address doesn't map to any known breakpoint, returns control back | |
9366 | to the simulator; the simulator then delivers the hardware | |
9367 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9368 | debugged. */ | |
a493e3e2 PA |
9369 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9370 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9371 | |
9372 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9373 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9374 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9375 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9376 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9377 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9378 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9379 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9380 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9381 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9382 | signal_print[GDB_SIGNAL_IO] = 0; | |
9383 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9384 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9385 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9386 | signal_print[GDB_SIGNAL_URG] = 0; | |
9387 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9388 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9389 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9390 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9391 | |
cd0fc7c3 SS |
9392 | /* These signals are used internally by user-level thread |
9393 | implementations. (See signal(5) on Solaris.) Like the above | |
9394 | signals, a healthy program receives and handles them as part of | |
9395 | its normal operation. */ | |
a493e3e2 PA |
9396 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9397 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9398 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9399 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9400 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9401 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9402 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9403 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9404 | |
2455069d UW |
9405 | /* Update cached state. */ |
9406 | signal_cache_update (-1); | |
9407 | ||
85c07804 AC |
9408 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9409 | &stop_on_solib_events, _("\ | |
9410 | Set stopping for shared library events."), _("\ | |
9411 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9412 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9413 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9414 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9415 | set_stop_on_solib_events, |
920d2a44 | 9416 | show_stop_on_solib_events, |
85c07804 | 9417 | &setlist, &showlist); |
c906108c | 9418 | |
7ab04401 AC |
9419 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9420 | follow_fork_mode_kind_names, | |
9421 | &follow_fork_mode_string, _("\ | |
9422 | Set debugger response to a program call of fork or vfork."), _("\ | |
9423 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9424 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9425 | parent - the original process is debugged after a fork\n\ | |
9426 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9427 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9428 | By default, the debugger will follow the parent process."), |
9429 | NULL, | |
920d2a44 | 9430 | show_follow_fork_mode_string, |
7ab04401 AC |
9431 | &setlist, &showlist); |
9432 | ||
6c95b8df PA |
9433 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9434 | follow_exec_mode_names, | |
9435 | &follow_exec_mode_string, _("\ | |
9436 | Set debugger response to a program call of exec."), _("\ | |
9437 | Show debugger response to a program call of exec."), _("\ | |
9438 | An exec call replaces the program image of a process.\n\ | |
9439 | \n\ | |
9440 | follow-exec-mode can be:\n\ | |
9441 | \n\ | |
cce7e648 | 9442 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9443 | to this new inferior. The program the process was running before\n\ |
9444 | the exec call can be restarted afterwards by restarting the original\n\ | |
9445 | inferior.\n\ | |
9446 | \n\ | |
9447 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9448 | The new executable image replaces the previous executable loaded in\n\ | |
9449 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9450 | the executable the process was running after the exec call.\n\ | |
9451 | \n\ | |
9452 | By default, the debugger will use the same inferior."), | |
9453 | NULL, | |
9454 | show_follow_exec_mode_string, | |
9455 | &setlist, &showlist); | |
9456 | ||
7ab04401 AC |
9457 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9458 | scheduler_enums, &scheduler_mode, _("\ | |
9459 | Set mode for locking scheduler during execution."), _("\ | |
9460 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9461 | off == no locking (threads may preempt at any time)\n\ |
9462 | on == full locking (no thread except the current thread may run)\n\ | |
9463 | This applies to both normal execution and replay mode.\n\ | |
9464 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9465 | In this mode, other threads may run during other commands.\n\ | |
9466 | This applies to both normal execution and replay mode.\n\ | |
9467 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9468 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9469 | show_scheduler_mode, |
7ab04401 | 9470 | &setlist, &showlist); |
5fbbeb29 | 9471 | |
d4db2f36 PA |
9472 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9473 | Set mode for resuming threads of all processes."), _("\ | |
9474 | Show mode for resuming threads of all processes."), _("\ | |
9475 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9476 | threads of all processes. When off (which is the default), execution\n\ | |
9477 | commands only resume the threads of the current process. The set of\n\ | |
9478 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9479 | mode (see help set scheduler-locking)."), | |
9480 | NULL, | |
9481 | show_schedule_multiple, | |
9482 | &setlist, &showlist); | |
9483 | ||
5bf193a2 AC |
9484 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9485 | Set mode of the step operation."), _("\ | |
9486 | Show mode of the step operation."), _("\ | |
9487 | When set, doing a step over a function without debug line information\n\ | |
9488 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9489 | function is skipped and the step command stops at a different source line."), | |
9490 | NULL, | |
920d2a44 | 9491 | show_step_stop_if_no_debug, |
5bf193a2 | 9492 | &setlist, &showlist); |
ca6724c1 | 9493 | |
72d0e2c5 YQ |
9494 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9495 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9496 | Set debugger's willingness to use displaced stepping."), _("\ |
9497 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9498 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9499 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9500 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9501 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9502 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9503 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9504 | NULL, |
9505 | show_can_use_displaced_stepping, | |
9506 | &setlist, &showlist); | |
237fc4c9 | 9507 | |
b2175913 MS |
9508 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9509 | &exec_direction, _("Set direction of execution.\n\ | |
9510 | Options are 'forward' or 'reverse'."), | |
9511 | _("Show direction of execution (forward/reverse)."), | |
9512 | _("Tells gdb whether to execute forward or backward."), | |
9513 | set_exec_direction_func, show_exec_direction_func, | |
9514 | &setlist, &showlist); | |
9515 | ||
6c95b8df PA |
9516 | /* Set/show detach-on-fork: user-settable mode. */ |
9517 | ||
9518 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9519 | Set whether gdb will detach the child of a fork."), _("\ | |
9520 | Show whether gdb will detach the child of a fork."), _("\ | |
9521 | Tells gdb whether to detach the child of a fork."), | |
9522 | NULL, NULL, &setlist, &showlist); | |
9523 | ||
03583c20 UW |
9524 | /* Set/show disable address space randomization mode. */ |
9525 | ||
9526 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9527 | &disable_randomization, _("\ | |
9528 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9529 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9530 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9531 | address space is disabled. Standalone programs run with the randomization\n\ | |
9532 | enabled by default on some platforms."), | |
9533 | &set_disable_randomization, | |
9534 | &show_disable_randomization, | |
9535 | &setlist, &showlist); | |
9536 | ||
ca6724c1 | 9537 | /* ptid initializations */ |
ca6724c1 KB |
9538 | inferior_ptid = null_ptid; |
9539 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9540 | |
76727919 TT |
9541 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed); |
9542 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested); | |
9543 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit); | |
9544 | gdb::observers::inferior_exit.attach (infrun_inferior_exit); | |
4aa995e1 PA |
9545 | |
9546 | /* Explicitly create without lookup, since that tries to create a | |
9547 | value with a void typed value, and when we get here, gdbarch | |
9548 | isn't initialized yet. At this point, we're quite sure there | |
9549 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9550 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9551 | |
9552 | add_setshow_boolean_cmd ("observer", no_class, | |
9553 | &observer_mode_1, _("\ | |
9554 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9555 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9556 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9557 | affect its execution. Registers and memory may not be changed,\n\ | |
9558 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9559 | or signalled."), | |
9560 | set_observer_mode, | |
9561 | show_observer_mode, | |
9562 | &setlist, | |
9563 | &showlist); | |
c906108c | 9564 | } |