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" | |
2f4fcf00 | 31 | #include "target-connection.h" |
c906108c SS |
32 | #include "gdbthread.h" |
33 | #include "annotate.h" | |
1adeb98a | 34 | #include "symfile.h" |
7a292a7a | 35 | #include "top.h" |
2acceee2 | 36 | #include "inf-loop.h" |
4e052eda | 37 | #include "regcache.h" |
fd0407d6 | 38 | #include "value.h" |
76727919 | 39 | #include "observable.h" |
f636b87d | 40 | #include "language.h" |
a77053c2 | 41 | #include "solib.h" |
f17517ea | 42 | #include "main.h" |
186c406b | 43 | #include "block.h" |
034dad6f | 44 | #include "mi/mi-common.h" |
4f8d22e3 | 45 | #include "event-top.h" |
96429cc8 | 46 | #include "record.h" |
d02ed0bb | 47 | #include "record-full.h" |
edb3359d | 48 | #include "inline-frame.h" |
4efc6507 | 49 | #include "jit.h" |
06cd862c | 50 | #include "tracepoint.h" |
1bfeeb0f | 51 | #include "skip.h" |
28106bc2 SDJ |
52 | #include "probe.h" |
53 | #include "objfiles.h" | |
de0bea00 | 54 | #include "completer.h" |
9107fc8d | 55 | #include "target-descriptions.h" |
f15cb84a | 56 | #include "target-dcache.h" |
d83ad864 | 57 | #include "terminal.h" |
ff862be4 | 58 | #include "solist.h" |
400b5eca | 59 | #include "gdbsupport/event-loop.h" |
243a9253 | 60 | #include "thread-fsm.h" |
268a13a5 | 61 | #include "gdbsupport/enum-flags.h" |
5ed8105e | 62 | #include "progspace-and-thread.h" |
268a13a5 | 63 | #include "gdbsupport/gdb_optional.h" |
46a62268 | 64 | #include "arch-utils.h" |
268a13a5 TT |
65 | #include "gdbsupport/scope-exit.h" |
66 | #include "gdbsupport/forward-scope-exit.h" | |
06cc9596 | 67 | #include "gdbsupport/gdb_select.h" |
5b6d1e4f | 68 | #include <unordered_map> |
93b54c8e | 69 | #include "async-event.h" |
c906108c SS |
70 | |
71 | /* Prototypes for local functions */ | |
72 | ||
2ea28649 | 73 | static void sig_print_info (enum gdb_signal); |
c906108c | 74 | |
96baa820 | 75 | static void sig_print_header (void); |
c906108c | 76 | |
d83ad864 DB |
77 | static void follow_inferior_reset_breakpoints (void); |
78 | ||
a289b8f6 JK |
79 | static int currently_stepping (struct thread_info *tp); |
80 | ||
2c03e5be | 81 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
82 | |
83 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
84 | ||
2484c66b UW |
85 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
86 | ||
8550d3b3 YQ |
87 | static int maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc); |
88 | ||
aff4e175 AB |
89 | static void resume (gdb_signal sig); |
90 | ||
5b6d1e4f PA |
91 | static void wait_for_inferior (inferior *inf); |
92 | ||
372316f1 PA |
93 | /* Asynchronous signal handler registered as event loop source for |
94 | when we have pending events ready to be passed to the core. */ | |
95 | static struct async_event_handler *infrun_async_inferior_event_token; | |
96 | ||
97 | /* Stores whether infrun_async was previously enabled or disabled. | |
98 | Starts off as -1, indicating "never enabled/disabled". */ | |
99 | static int infrun_is_async = -1; | |
100 | ||
101 | /* See infrun.h. */ | |
102 | ||
103 | void | |
104 | infrun_async (int enable) | |
105 | { | |
106 | if (infrun_is_async != enable) | |
107 | { | |
108 | infrun_is_async = enable; | |
109 | ||
110 | if (debug_infrun) | |
111 | fprintf_unfiltered (gdb_stdlog, | |
112 | "infrun: infrun_async(%d)\n", | |
113 | enable); | |
114 | ||
115 | if (enable) | |
116 | mark_async_event_handler (infrun_async_inferior_event_token); | |
117 | else | |
118 | clear_async_event_handler (infrun_async_inferior_event_token); | |
119 | } | |
120 | } | |
121 | ||
0b333c5e PA |
122 | /* See infrun.h. */ |
123 | ||
124 | void | |
125 | mark_infrun_async_event_handler (void) | |
126 | { | |
127 | mark_async_event_handler (infrun_async_inferior_event_token); | |
128 | } | |
129 | ||
5fbbeb29 CF |
130 | /* When set, stop the 'step' command if we enter a function which has |
131 | no line number information. The normal behavior is that we step | |
132 | over such function. */ | |
491144b5 | 133 | bool step_stop_if_no_debug = false; |
920d2a44 AC |
134 | static void |
135 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
136 | struct cmd_list_element *c, const char *value) | |
137 | { | |
138 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
139 | } | |
5fbbeb29 | 140 | |
b9f437de PA |
141 | /* proceed and normal_stop use this to notify the user when the |
142 | inferior stopped in a different thread than it had been running | |
143 | in. */ | |
96baa820 | 144 | |
39f77062 | 145 | static ptid_t previous_inferior_ptid; |
7a292a7a | 146 | |
07107ca6 LM |
147 | /* If set (default for legacy reasons), when following a fork, GDB |
148 | will detach from one of the fork branches, child or parent. | |
149 | Exactly which branch is detached depends on 'set follow-fork-mode' | |
150 | setting. */ | |
151 | ||
491144b5 | 152 | static bool detach_fork = true; |
6c95b8df | 153 | |
491144b5 | 154 | bool debug_displaced = false; |
237fc4c9 PA |
155 | static void |
156 | show_debug_displaced (struct ui_file *file, int from_tty, | |
157 | struct cmd_list_element *c, const char *value) | |
158 | { | |
159 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
160 | } | |
161 | ||
ccce17b0 | 162 | unsigned int debug_infrun = 0; |
920d2a44 AC |
163 | static void |
164 | show_debug_infrun (struct ui_file *file, int from_tty, | |
165 | struct cmd_list_element *c, const char *value) | |
166 | { | |
167 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
168 | } | |
527159b7 | 169 | |
03583c20 UW |
170 | |
171 | /* Support for disabling address space randomization. */ | |
172 | ||
491144b5 | 173 | bool disable_randomization = true; |
03583c20 UW |
174 | |
175 | static void | |
176 | show_disable_randomization (struct ui_file *file, int from_tty, | |
177 | struct cmd_list_element *c, const char *value) | |
178 | { | |
179 | if (target_supports_disable_randomization ()) | |
180 | fprintf_filtered (file, | |
181 | _("Disabling randomization of debuggee's " | |
182 | "virtual address space is %s.\n"), | |
183 | value); | |
184 | else | |
185 | fputs_filtered (_("Disabling randomization of debuggee's " | |
186 | "virtual address space is unsupported on\n" | |
187 | "this platform.\n"), file); | |
188 | } | |
189 | ||
190 | static void | |
eb4c3f4a | 191 | set_disable_randomization (const char *args, int from_tty, |
03583c20 UW |
192 | struct cmd_list_element *c) |
193 | { | |
194 | if (!target_supports_disable_randomization ()) | |
195 | error (_("Disabling randomization of debuggee's " | |
196 | "virtual address space is unsupported on\n" | |
197 | "this platform.")); | |
198 | } | |
199 | ||
d32dc48e PA |
200 | /* User interface for non-stop mode. */ |
201 | ||
491144b5 CB |
202 | bool non_stop = false; |
203 | static bool non_stop_1 = false; | |
d32dc48e PA |
204 | |
205 | static void | |
eb4c3f4a | 206 | set_non_stop (const char *args, int from_tty, |
d32dc48e PA |
207 | struct cmd_list_element *c) |
208 | { | |
209 | if (target_has_execution) | |
210 | { | |
211 | non_stop_1 = non_stop; | |
212 | error (_("Cannot change this setting while the inferior is running.")); | |
213 | } | |
214 | ||
215 | non_stop = non_stop_1; | |
216 | } | |
217 | ||
218 | static void | |
219 | show_non_stop (struct ui_file *file, int from_tty, | |
220 | struct cmd_list_element *c, const char *value) | |
221 | { | |
222 | fprintf_filtered (file, | |
223 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
224 | value); | |
225 | } | |
226 | ||
d914c394 SS |
227 | /* "Observer mode" is somewhat like a more extreme version of |
228 | non-stop, in which all GDB operations that might affect the | |
229 | target's execution have been disabled. */ | |
230 | ||
491144b5 CB |
231 | bool observer_mode = false; |
232 | static bool observer_mode_1 = false; | |
d914c394 SS |
233 | |
234 | static void | |
eb4c3f4a | 235 | set_observer_mode (const char *args, int from_tty, |
d914c394 SS |
236 | struct cmd_list_element *c) |
237 | { | |
d914c394 SS |
238 | if (target_has_execution) |
239 | { | |
240 | observer_mode_1 = observer_mode; | |
241 | error (_("Cannot change this setting while the inferior is running.")); | |
242 | } | |
243 | ||
244 | observer_mode = observer_mode_1; | |
245 | ||
246 | may_write_registers = !observer_mode; | |
247 | may_write_memory = !observer_mode; | |
248 | may_insert_breakpoints = !observer_mode; | |
249 | may_insert_tracepoints = !observer_mode; | |
250 | /* We can insert fast tracepoints in or out of observer mode, | |
251 | but enable them if we're going into this mode. */ | |
252 | if (observer_mode) | |
491144b5 | 253 | may_insert_fast_tracepoints = true; |
d914c394 SS |
254 | may_stop = !observer_mode; |
255 | update_target_permissions (); | |
256 | ||
257 | /* Going *into* observer mode we must force non-stop, then | |
258 | going out we leave it that way. */ | |
259 | if (observer_mode) | |
260 | { | |
d914c394 | 261 | pagination_enabled = 0; |
491144b5 | 262 | non_stop = non_stop_1 = true; |
d914c394 SS |
263 | } |
264 | ||
265 | if (from_tty) | |
266 | printf_filtered (_("Observer mode is now %s.\n"), | |
267 | (observer_mode ? "on" : "off")); | |
268 | } | |
269 | ||
270 | static void | |
271 | show_observer_mode (struct ui_file *file, int from_tty, | |
272 | struct cmd_list_element *c, const char *value) | |
273 | { | |
274 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
275 | } | |
276 | ||
277 | /* This updates the value of observer mode based on changes in | |
278 | permissions. Note that we are deliberately ignoring the values of | |
279 | may-write-registers and may-write-memory, since the user may have | |
280 | reason to enable these during a session, for instance to turn on a | |
281 | debugging-related global. */ | |
282 | ||
283 | void | |
284 | update_observer_mode (void) | |
285 | { | |
491144b5 CB |
286 | bool newval = (!may_insert_breakpoints |
287 | && !may_insert_tracepoints | |
288 | && may_insert_fast_tracepoints | |
289 | && !may_stop | |
290 | && non_stop); | |
d914c394 SS |
291 | |
292 | /* Let the user know if things change. */ | |
293 | if (newval != observer_mode) | |
294 | printf_filtered (_("Observer mode is now %s.\n"), | |
295 | (newval ? "on" : "off")); | |
296 | ||
297 | observer_mode = observer_mode_1 = newval; | |
298 | } | |
c2c6d25f | 299 | |
c906108c SS |
300 | /* Tables of how to react to signals; the user sets them. */ |
301 | ||
adc6a863 PA |
302 | static unsigned char signal_stop[GDB_SIGNAL_LAST]; |
303 | static unsigned char signal_print[GDB_SIGNAL_LAST]; | |
304 | static unsigned char signal_program[GDB_SIGNAL_LAST]; | |
c906108c | 305 | |
ab04a2af TT |
306 | /* Table of signals that are registered with "catch signal". A |
307 | non-zero entry indicates that the signal is caught by some "catch | |
adc6a863 PA |
308 | signal" command. */ |
309 | static unsigned char signal_catch[GDB_SIGNAL_LAST]; | |
ab04a2af | 310 | |
2455069d UW |
311 | /* Table of signals that the target may silently handle. |
312 | This is automatically determined from the flags above, | |
313 | and simply cached here. */ | |
adc6a863 | 314 | static unsigned char signal_pass[GDB_SIGNAL_LAST]; |
2455069d | 315 | |
c906108c SS |
316 | #define SET_SIGS(nsigs,sigs,flags) \ |
317 | do { \ | |
318 | int signum = (nsigs); \ | |
319 | while (signum-- > 0) \ | |
320 | if ((sigs)[signum]) \ | |
321 | (flags)[signum] = 1; \ | |
322 | } while (0) | |
323 | ||
324 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
325 | do { \ | |
326 | int signum = (nsigs); \ | |
327 | while (signum-- > 0) \ | |
328 | if ((sigs)[signum]) \ | |
329 | (flags)[signum] = 0; \ | |
330 | } while (0) | |
331 | ||
9b224c5e PA |
332 | /* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of |
333 | this function is to avoid exporting `signal_program'. */ | |
334 | ||
335 | void | |
336 | update_signals_program_target (void) | |
337 | { | |
adc6a863 | 338 | target_program_signals (signal_program); |
9b224c5e PA |
339 | } |
340 | ||
1777feb0 | 341 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 342 | |
edb3359d | 343 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
344 | |
345 | /* Command list pointer for the "stop" placeholder. */ | |
346 | ||
347 | static struct cmd_list_element *stop_command; | |
348 | ||
c906108c SS |
349 | /* Nonzero if we want to give control to the user when we're notified |
350 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 351 | int stop_on_solib_events; |
f9e14852 GB |
352 | |
353 | /* Enable or disable optional shared library event breakpoints | |
354 | as appropriate when the above flag is changed. */ | |
355 | ||
356 | static void | |
eb4c3f4a TT |
357 | set_stop_on_solib_events (const char *args, |
358 | int from_tty, struct cmd_list_element *c) | |
f9e14852 GB |
359 | { |
360 | update_solib_breakpoints (); | |
361 | } | |
362 | ||
920d2a44 AC |
363 | static void |
364 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
365 | struct cmd_list_element *c, const char *value) | |
366 | { | |
367 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
368 | value); | |
369 | } | |
c906108c | 370 | |
c906108c SS |
371 | /* Nonzero after stop if current stack frame should be printed. */ |
372 | ||
373 | static int stop_print_frame; | |
374 | ||
5b6d1e4f PA |
375 | /* This is a cached copy of the target/ptid/waitstatus of the last |
376 | event returned by target_wait()/deprecated_target_wait_hook(). | |
377 | This information is returned by get_last_target_status(). */ | |
378 | static process_stratum_target *target_last_proc_target; | |
39f77062 | 379 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
380 | static struct target_waitstatus target_last_waitstatus; |
381 | ||
4e1c45ea | 382 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 | 383 | |
53904c9e AC |
384 | static const char follow_fork_mode_child[] = "child"; |
385 | static const char follow_fork_mode_parent[] = "parent"; | |
386 | ||
40478521 | 387 | static const char *const follow_fork_mode_kind_names[] = { |
53904c9e AC |
388 | follow_fork_mode_child, |
389 | follow_fork_mode_parent, | |
390 | NULL | |
ef346e04 | 391 | }; |
c906108c | 392 | |
53904c9e | 393 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
394 | static void |
395 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
396 | struct cmd_list_element *c, const char *value) | |
397 | { | |
3e43a32a MS |
398 | fprintf_filtered (file, |
399 | _("Debugger response to a program " | |
400 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
401 | value); |
402 | } | |
c906108c SS |
403 | \f |
404 | ||
d83ad864 DB |
405 | /* Handle changes to the inferior list based on the type of fork, |
406 | which process is being followed, and whether the other process | |
407 | should be detached. On entry inferior_ptid must be the ptid of | |
408 | the fork parent. At return inferior_ptid is the ptid of the | |
409 | followed inferior. */ | |
410 | ||
5ab2fbf1 SM |
411 | static bool |
412 | follow_fork_inferior (bool follow_child, bool detach_fork) | |
d83ad864 DB |
413 | { |
414 | int has_vforked; | |
79639e11 | 415 | ptid_t parent_ptid, child_ptid; |
d83ad864 DB |
416 | |
417 | has_vforked = (inferior_thread ()->pending_follow.kind | |
418 | == TARGET_WAITKIND_VFORKED); | |
79639e11 PA |
419 | parent_ptid = inferior_ptid; |
420 | child_ptid = inferior_thread ()->pending_follow.value.related_pid; | |
d83ad864 DB |
421 | |
422 | if (has_vforked | |
423 | && !non_stop /* Non-stop always resumes both branches. */ | |
3b12939d | 424 | && current_ui->prompt_state == PROMPT_BLOCKED |
d83ad864 DB |
425 | && !(follow_child || detach_fork || sched_multi)) |
426 | { | |
427 | /* The parent stays blocked inside the vfork syscall until the | |
428 | child execs or exits. If we don't let the child run, then | |
429 | the parent stays blocked. If we're telling the parent to run | |
430 | in the foreground, the user will not be able to ctrl-c to get | |
431 | back the terminal, effectively hanging the debug session. */ | |
432 | fprintf_filtered (gdb_stderr, _("\ | |
433 | Can not resume the parent process over vfork in the foreground while\n\ | |
434 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
435 | \"set schedule-multiple\".\n")); | |
d83ad864 DB |
436 | return 1; |
437 | } | |
438 | ||
439 | if (!follow_child) | |
440 | { | |
441 | /* Detach new forked process? */ | |
442 | if (detach_fork) | |
443 | { | |
d83ad864 DB |
444 | /* Before detaching from the child, remove all breakpoints |
445 | from it. If we forked, then this has already been taken | |
446 | care of by infrun.c. If we vforked however, any | |
447 | breakpoint inserted in the parent is visible in the | |
448 | child, even those added while stopped in a vfork | |
449 | catchpoint. This will remove the breakpoints from the | |
450 | parent also, but they'll be reinserted below. */ | |
451 | if (has_vforked) | |
452 | { | |
453 | /* Keep breakpoints list in sync. */ | |
00431a78 | 454 | remove_breakpoints_inf (current_inferior ()); |
d83ad864 DB |
455 | } |
456 | ||
f67c0c91 | 457 | if (print_inferior_events) |
d83ad864 | 458 | { |
8dd06f7a | 459 | /* Ensure that we have a process ptid. */ |
e99b03dc | 460 | ptid_t process_ptid = ptid_t (child_ptid.pid ()); |
8dd06f7a | 461 | |
223ffa71 | 462 | target_terminal::ours_for_output (); |
d83ad864 | 463 | fprintf_filtered (gdb_stdlog, |
f67c0c91 | 464 | _("[Detaching after %s from child %s]\n"), |
6f259a23 | 465 | has_vforked ? "vfork" : "fork", |
a068643d | 466 | target_pid_to_str (process_ptid).c_str ()); |
d83ad864 DB |
467 | } |
468 | } | |
469 | else | |
470 | { | |
471 | struct inferior *parent_inf, *child_inf; | |
d83ad864 DB |
472 | |
473 | /* Add process to GDB's tables. */ | |
e99b03dc | 474 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
475 | |
476 | parent_inf = current_inferior (); | |
477 | child_inf->attach_flag = parent_inf->attach_flag; | |
478 | copy_terminal_info (child_inf, parent_inf); | |
479 | child_inf->gdbarch = parent_inf->gdbarch; | |
480 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
481 | ||
5ed8105e | 482 | scoped_restore_current_pspace_and_thread restore_pspace_thread; |
d83ad864 | 483 | |
2a00d7ce | 484 | set_current_inferior (child_inf); |
5b6d1e4f | 485 | switch_to_no_thread (); |
d83ad864 | 486 | child_inf->symfile_flags = SYMFILE_NO_READ; |
5b6d1e4f PA |
487 | push_target (parent_inf->process_target ()); |
488 | add_thread_silent (child_inf->process_target (), child_ptid); | |
489 | inferior_ptid = child_ptid; | |
d83ad864 DB |
490 | |
491 | /* If this is a vfork child, then the address-space is | |
492 | shared with the parent. */ | |
493 | if (has_vforked) | |
494 | { | |
495 | child_inf->pspace = parent_inf->pspace; | |
496 | child_inf->aspace = parent_inf->aspace; | |
497 | ||
5b6d1e4f PA |
498 | exec_on_vfork (); |
499 | ||
d83ad864 DB |
500 | /* The parent will be frozen until the child is done |
501 | with the shared region. Keep track of the | |
502 | parent. */ | |
503 | child_inf->vfork_parent = parent_inf; | |
504 | child_inf->pending_detach = 0; | |
505 | parent_inf->vfork_child = child_inf; | |
506 | parent_inf->pending_detach = 0; | |
507 | } | |
508 | else | |
509 | { | |
510 | child_inf->aspace = new_address_space (); | |
564b1e3f | 511 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
512 | child_inf->removable = 1; |
513 | set_current_program_space (child_inf->pspace); | |
514 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
515 | ||
516 | /* Let the shared library layer (e.g., solib-svr4) learn | |
517 | about this new process, relocate the cloned exec, pull | |
518 | in shared libraries, and install the solib event | |
519 | breakpoint. If a "cloned-VM" event was propagated | |
520 | better throughout the core, this wouldn't be | |
521 | required. */ | |
522 | solib_create_inferior_hook (0); | |
523 | } | |
d83ad864 DB |
524 | } |
525 | ||
526 | if (has_vforked) | |
527 | { | |
528 | struct inferior *parent_inf; | |
529 | ||
530 | parent_inf = current_inferior (); | |
531 | ||
532 | /* If we detached from the child, then we have to be careful | |
533 | to not insert breakpoints in the parent until the child | |
534 | is done with the shared memory region. However, if we're | |
535 | staying attached to the child, then we can and should | |
536 | insert breakpoints, so that we can debug it. A | |
537 | subsequent child exec or exit is enough to know when does | |
538 | the child stops using the parent's address space. */ | |
539 | parent_inf->waiting_for_vfork_done = detach_fork; | |
540 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; | |
541 | } | |
542 | } | |
543 | else | |
544 | { | |
545 | /* Follow the child. */ | |
546 | struct inferior *parent_inf, *child_inf; | |
547 | struct program_space *parent_pspace; | |
548 | ||
f67c0c91 | 549 | if (print_inferior_events) |
d83ad864 | 550 | { |
f67c0c91 SDJ |
551 | std::string parent_pid = target_pid_to_str (parent_ptid); |
552 | std::string child_pid = target_pid_to_str (child_ptid); | |
553 | ||
223ffa71 | 554 | target_terminal::ours_for_output (); |
6f259a23 | 555 | fprintf_filtered (gdb_stdlog, |
f67c0c91 SDJ |
556 | _("[Attaching after %s %s to child %s]\n"), |
557 | parent_pid.c_str (), | |
6f259a23 | 558 | has_vforked ? "vfork" : "fork", |
f67c0c91 | 559 | child_pid.c_str ()); |
d83ad864 DB |
560 | } |
561 | ||
562 | /* Add the new inferior first, so that the target_detach below | |
563 | doesn't unpush the target. */ | |
564 | ||
e99b03dc | 565 | child_inf = add_inferior (child_ptid.pid ()); |
d83ad864 DB |
566 | |
567 | parent_inf = current_inferior (); | |
568 | child_inf->attach_flag = parent_inf->attach_flag; | |
569 | copy_terminal_info (child_inf, parent_inf); | |
570 | child_inf->gdbarch = parent_inf->gdbarch; | |
571 | copy_inferior_target_desc_info (child_inf, parent_inf); | |
572 | ||
573 | parent_pspace = parent_inf->pspace; | |
574 | ||
5b6d1e4f | 575 | process_stratum_target *target = parent_inf->process_target (); |
d83ad864 | 576 | |
5b6d1e4f PA |
577 | { |
578 | /* Hold a strong reference to the target while (maybe) | |
579 | detaching the parent. Otherwise detaching could close the | |
580 | target. */ | |
581 | auto target_ref = target_ops_ref::new_reference (target); | |
582 | ||
583 | /* If we're vforking, we want to hold on to the parent until | |
584 | the child exits or execs. At child exec or exit time we | |
585 | can remove the old breakpoints from the parent and detach | |
586 | or resume debugging it. Otherwise, detach the parent now; | |
587 | we'll want to reuse it's program/address spaces, but we | |
588 | can't set them to the child before removing breakpoints | |
589 | from the parent, otherwise, the breakpoints module could | |
590 | decide to remove breakpoints from the wrong process (since | |
591 | they'd be assigned to the same address space). */ | |
592 | ||
593 | if (has_vforked) | |
594 | { | |
595 | gdb_assert (child_inf->vfork_parent == NULL); | |
596 | gdb_assert (parent_inf->vfork_child == NULL); | |
597 | child_inf->vfork_parent = parent_inf; | |
598 | child_inf->pending_detach = 0; | |
599 | parent_inf->vfork_child = child_inf; | |
600 | parent_inf->pending_detach = detach_fork; | |
601 | parent_inf->waiting_for_vfork_done = 0; | |
602 | } | |
603 | else if (detach_fork) | |
604 | { | |
605 | if (print_inferior_events) | |
606 | { | |
607 | /* Ensure that we have a process ptid. */ | |
608 | ptid_t process_ptid = ptid_t (parent_ptid.pid ()); | |
609 | ||
610 | target_terminal::ours_for_output (); | |
611 | fprintf_filtered (gdb_stdlog, | |
612 | _("[Detaching after fork from " | |
613 | "parent %s]\n"), | |
614 | target_pid_to_str (process_ptid).c_str ()); | |
615 | } | |
8dd06f7a | 616 | |
5b6d1e4f PA |
617 | target_detach (parent_inf, 0); |
618 | parent_inf = NULL; | |
619 | } | |
6f259a23 | 620 | |
5b6d1e4f | 621 | /* Note that the detach above makes PARENT_INF dangling. */ |
d83ad864 | 622 | |
5b6d1e4f PA |
623 | /* Add the child thread to the appropriate lists, and switch |
624 | to this new thread, before cloning the program space, and | |
625 | informing the solib layer about this new process. */ | |
d83ad864 | 626 | |
5b6d1e4f PA |
627 | set_current_inferior (child_inf); |
628 | push_target (target); | |
629 | } | |
d83ad864 | 630 | |
5b6d1e4f | 631 | add_thread_silent (target, child_ptid); |
79639e11 | 632 | inferior_ptid = child_ptid; |
d83ad864 DB |
633 | |
634 | /* If this is a vfork child, then the address-space is shared | |
635 | with the parent. If we detached from the parent, then we can | |
636 | reuse the parent's program/address spaces. */ | |
637 | if (has_vforked || detach_fork) | |
638 | { | |
639 | child_inf->pspace = parent_pspace; | |
640 | child_inf->aspace = child_inf->pspace->aspace; | |
5b6d1e4f PA |
641 | |
642 | exec_on_vfork (); | |
d83ad864 DB |
643 | } |
644 | else | |
645 | { | |
646 | child_inf->aspace = new_address_space (); | |
564b1e3f | 647 | child_inf->pspace = new program_space (child_inf->aspace); |
d83ad864 DB |
648 | child_inf->removable = 1; |
649 | child_inf->symfile_flags = SYMFILE_NO_READ; | |
650 | set_current_program_space (child_inf->pspace); | |
651 | clone_program_space (child_inf->pspace, parent_pspace); | |
652 | ||
653 | /* Let the shared library layer (e.g., solib-svr4) learn | |
654 | about this new process, relocate the cloned exec, pull in | |
655 | shared libraries, and install the solib event breakpoint. | |
656 | If a "cloned-VM" event was propagated better throughout | |
657 | the core, this wouldn't be required. */ | |
658 | solib_create_inferior_hook (0); | |
659 | } | |
660 | } | |
661 | ||
662 | return target_follow_fork (follow_child, detach_fork); | |
663 | } | |
664 | ||
e58b0e63 PA |
665 | /* Tell the target to follow the fork we're stopped at. Returns true |
666 | if the inferior should be resumed; false, if the target for some | |
667 | reason decided it's best not to resume. */ | |
668 | ||
5ab2fbf1 SM |
669 | static bool |
670 | follow_fork () | |
c906108c | 671 | { |
5ab2fbf1 SM |
672 | bool follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
673 | bool should_resume = true; | |
e58b0e63 PA |
674 | struct thread_info *tp; |
675 | ||
676 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
677 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
678 | parent thread structure's run control related fields, not just these. |
679 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
680 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 681 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
682 | CORE_ADDR step_range_start = 0; |
683 | CORE_ADDR step_range_end = 0; | |
bf4cb9be TV |
684 | int current_line = 0; |
685 | symtab *current_symtab = NULL; | |
4e3990f4 | 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); |
5ab2fbf1 | 716 | should_resume = false; |
e58b0e63 PA |
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; | |
bf4cb9be TV |
739 | current_line = tp->current_line; |
740 | current_symtab = tp->current_symtab; | |
16c381f0 | 741 | step_frame_id = tp->control.step_frame_id; |
186c406b TT |
742 | exception_resume_breakpoint |
743 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
8980e177 | 744 | thread_fsm = tp->thread_fsm; |
e58b0e63 PA |
745 | |
746 | /* For now, delete the parent's sr breakpoint, otherwise, | |
747 | parent/child sr breakpoints are considered duplicates, | |
748 | and the child version will not be installed. Remove | |
749 | this when the breakpoints module becomes aware of | |
750 | inferiors and address spaces. */ | |
751 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
752 | tp->control.step_range_start = 0; |
753 | tp->control.step_range_end = 0; | |
754 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 755 | delete_exception_resume_breakpoint (tp); |
8980e177 | 756 | tp->thread_fsm = NULL; |
e58b0e63 PA |
757 | } |
758 | ||
759 | parent = inferior_ptid; | |
760 | child = tp->pending_follow.value.related_pid; | |
761 | ||
5b6d1e4f | 762 | process_stratum_target *parent_targ = tp->inf->process_target (); |
d83ad864 DB |
763 | /* Set up inferior(s) as specified by the caller, and tell the |
764 | target to do whatever is necessary to follow either parent | |
765 | or child. */ | |
766 | if (follow_fork_inferior (follow_child, detach_fork)) | |
e58b0e63 PA |
767 | { |
768 | /* Target refused to follow, or there's some other reason | |
769 | we shouldn't resume. */ | |
770 | should_resume = 0; | |
771 | } | |
772 | else | |
773 | { | |
774 | /* This pending follow fork event is now handled, one way | |
775 | or another. The previous selected thread may be gone | |
776 | from the lists by now, but if it is still around, need | |
777 | to clear the pending follow request. */ | |
5b6d1e4f | 778 | tp = find_thread_ptid (parent_targ, parent); |
e58b0e63 PA |
779 | if (tp) |
780 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
781 | ||
782 | /* This makes sure we don't try to apply the "Switched | |
783 | over from WAIT_PID" logic above. */ | |
784 | nullify_last_target_wait_ptid (); | |
785 | ||
1777feb0 | 786 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
787 | if (follow_child) |
788 | { | |
5b6d1e4f | 789 | thread_info *child_thr = find_thread_ptid (parent_targ, child); |
00431a78 | 790 | switch_to_thread (child_thr); |
e58b0e63 PA |
791 | |
792 | /* ... and preserve the stepping state, in case the | |
793 | user was stepping over the fork call. */ | |
794 | if (should_resume) | |
795 | { | |
796 | tp = inferior_thread (); | |
8358c15c JK |
797 | tp->control.step_resume_breakpoint |
798 | = step_resume_breakpoint; | |
16c381f0 JK |
799 | tp->control.step_range_start = step_range_start; |
800 | tp->control.step_range_end = step_range_end; | |
bf4cb9be TV |
801 | tp->current_line = current_line; |
802 | tp->current_symtab = current_symtab; | |
16c381f0 | 803 | tp->control.step_frame_id = step_frame_id; |
186c406b TT |
804 | tp->control.exception_resume_breakpoint |
805 | = exception_resume_breakpoint; | |
8980e177 | 806 | tp->thread_fsm = thread_fsm; |
e58b0e63 PA |
807 | } |
808 | else | |
809 | { | |
810 | /* If we get here, it was because we're trying to | |
811 | resume from a fork catchpoint, but, the user | |
812 | has switched threads away from the thread that | |
813 | forked. In that case, the resume command | |
814 | issued is most likely not applicable to the | |
815 | child, so just warn, and refuse to resume. */ | |
3e43a32a | 816 | warning (_("Not resuming: switched threads " |
fd7dcb94 | 817 | "before following fork child.")); |
e58b0e63 PA |
818 | } |
819 | ||
820 | /* Reset breakpoints in the child as appropriate. */ | |
821 | follow_inferior_reset_breakpoints (); | |
822 | } | |
e58b0e63 PA |
823 | } |
824 | } | |
825 | break; | |
826 | case TARGET_WAITKIND_SPURIOUS: | |
827 | /* Nothing to follow. */ | |
828 | break; | |
829 | default: | |
830 | internal_error (__FILE__, __LINE__, | |
831 | "Unexpected pending_follow.kind %d\n", | |
832 | tp->pending_follow.kind); | |
833 | break; | |
834 | } | |
c906108c | 835 | |
e58b0e63 | 836 | return should_resume; |
c906108c SS |
837 | } |
838 | ||
d83ad864 | 839 | static void |
6604731b | 840 | follow_inferior_reset_breakpoints (void) |
c906108c | 841 | { |
4e1c45ea PA |
842 | struct thread_info *tp = inferior_thread (); |
843 | ||
6604731b DJ |
844 | /* Was there a step_resume breakpoint? (There was if the user |
845 | did a "next" at the fork() call.) If so, explicitly reset its | |
a1aa2221 LM |
846 | thread number. Cloned step_resume breakpoints are disabled on |
847 | creation, so enable it here now that it is associated with the | |
848 | correct thread. | |
6604731b DJ |
849 | |
850 | step_resumes are a form of bp that are made to be per-thread. | |
851 | Since we created the step_resume bp when the parent process | |
852 | was being debugged, and now are switching to the child process, | |
853 | from the breakpoint package's viewpoint, that's a switch of | |
854 | "threads". We must update the bp's notion of which thread | |
855 | it is for, or it'll be ignored when it triggers. */ | |
856 | ||
8358c15c | 857 | if (tp->control.step_resume_breakpoint) |
a1aa2221 LM |
858 | { |
859 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
860 | tp->control.step_resume_breakpoint->loc->enabled = 1; | |
861 | } | |
6604731b | 862 | |
a1aa2221 | 863 | /* Treat exception_resume breakpoints like step_resume breakpoints. */ |
186c406b | 864 | if (tp->control.exception_resume_breakpoint) |
a1aa2221 LM |
865 | { |
866 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
867 | tp->control.exception_resume_breakpoint->loc->enabled = 1; | |
868 | } | |
186c406b | 869 | |
6604731b DJ |
870 | /* Reinsert all breakpoints in the child. The user may have set |
871 | breakpoints after catching the fork, in which case those | |
872 | were never set in the child, but only in the parent. This makes | |
873 | sure the inserted breakpoints match the breakpoint list. */ | |
874 | ||
875 | breakpoint_re_set (); | |
876 | insert_breakpoints (); | |
c906108c | 877 | } |
c906108c | 878 | |
6c95b8df PA |
879 | /* The child has exited or execed: resume threads of the parent the |
880 | user wanted to be executing. */ | |
881 | ||
882 | static int | |
883 | proceed_after_vfork_done (struct thread_info *thread, | |
884 | void *arg) | |
885 | { | |
886 | int pid = * (int *) arg; | |
887 | ||
00431a78 PA |
888 | if (thread->ptid.pid () == pid |
889 | && thread->state == THREAD_RUNNING | |
890 | && !thread->executing | |
6c95b8df | 891 | && !thread->stop_requested |
a493e3e2 | 892 | && thread->suspend.stop_signal == GDB_SIGNAL_0) |
6c95b8df PA |
893 | { |
894 | if (debug_infrun) | |
895 | fprintf_unfiltered (gdb_stdlog, | |
896 | "infrun: resuming vfork parent thread %s\n", | |
a068643d | 897 | target_pid_to_str (thread->ptid).c_str ()); |
6c95b8df | 898 | |
00431a78 | 899 | switch_to_thread (thread); |
70509625 | 900 | clear_proceed_status (0); |
64ce06e4 | 901 | proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT); |
6c95b8df PA |
902 | } |
903 | ||
904 | return 0; | |
905 | } | |
906 | ||
5ed8105e PA |
907 | /* Save/restore inferior_ptid, current program space and current |
908 | inferior. Only use this if the current context points at an exited | |
909 | inferior (and therefore there's no current thread to save). */ | |
910 | class scoped_restore_exited_inferior | |
911 | { | |
912 | public: | |
913 | scoped_restore_exited_inferior () | |
914 | : m_saved_ptid (&inferior_ptid) | |
915 | {} | |
916 | ||
917 | private: | |
918 | scoped_restore_tmpl<ptid_t> m_saved_ptid; | |
919 | scoped_restore_current_program_space m_pspace; | |
920 | scoped_restore_current_inferior m_inferior; | |
921 | }; | |
922 | ||
6c95b8df PA |
923 | /* Called whenever we notice an exec or exit event, to handle |
924 | detaching or resuming a vfork parent. */ | |
925 | ||
926 | static void | |
927 | handle_vfork_child_exec_or_exit (int exec) | |
928 | { | |
929 | struct inferior *inf = current_inferior (); | |
930 | ||
931 | if (inf->vfork_parent) | |
932 | { | |
933 | int resume_parent = -1; | |
934 | ||
935 | /* This exec or exit marks the end of the shared memory region | |
b73715df TV |
936 | between the parent and the child. Break the bonds. */ |
937 | inferior *vfork_parent = inf->vfork_parent; | |
938 | inf->vfork_parent->vfork_child = NULL; | |
939 | inf->vfork_parent = NULL; | |
6c95b8df | 940 | |
b73715df TV |
941 | /* If the user wanted to detach from the parent, now is the |
942 | time. */ | |
943 | if (vfork_parent->pending_detach) | |
6c95b8df PA |
944 | { |
945 | struct thread_info *tp; | |
6c95b8df PA |
946 | struct program_space *pspace; |
947 | struct address_space *aspace; | |
948 | ||
1777feb0 | 949 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df | 950 | |
b73715df | 951 | vfork_parent->pending_detach = 0; |
68c9da30 | 952 | |
5ed8105e PA |
953 | gdb::optional<scoped_restore_exited_inferior> |
954 | maybe_restore_inferior; | |
955 | gdb::optional<scoped_restore_current_pspace_and_thread> | |
956 | maybe_restore_thread; | |
957 | ||
958 | /* If we're handling a child exit, then inferior_ptid points | |
959 | at the inferior's pid, not to a thread. */ | |
f50f4e56 | 960 | if (!exec) |
5ed8105e | 961 | maybe_restore_inferior.emplace (); |
f50f4e56 | 962 | else |
5ed8105e | 963 | maybe_restore_thread.emplace (); |
6c95b8df PA |
964 | |
965 | /* We're letting loose of the parent. */ | |
b73715df | 966 | tp = any_live_thread_of_inferior (vfork_parent); |
00431a78 | 967 | switch_to_thread (tp); |
6c95b8df PA |
968 | |
969 | /* We're about to detach from the parent, which implicitly | |
970 | removes breakpoints from its address space. There's a | |
971 | catch here: we want to reuse the spaces for the child, | |
972 | but, parent/child are still sharing the pspace at this | |
973 | point, although the exec in reality makes the kernel give | |
974 | the child a fresh set of new pages. The problem here is | |
975 | that the breakpoints module being unaware of this, would | |
976 | likely chose the child process to write to the parent | |
977 | address space. Swapping the child temporarily away from | |
978 | the spaces has the desired effect. Yes, this is "sort | |
979 | of" a hack. */ | |
980 | ||
981 | pspace = inf->pspace; | |
982 | aspace = inf->aspace; | |
983 | inf->aspace = NULL; | |
984 | inf->pspace = NULL; | |
985 | ||
f67c0c91 | 986 | if (print_inferior_events) |
6c95b8df | 987 | { |
a068643d | 988 | std::string pidstr |
b73715df | 989 | = target_pid_to_str (ptid_t (vfork_parent->pid)); |
f67c0c91 | 990 | |
223ffa71 | 991 | target_terminal::ours_for_output (); |
6c95b8df PA |
992 | |
993 | if (exec) | |
6f259a23 DB |
994 | { |
995 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 996 | _("[Detaching vfork parent %s " |
a068643d | 997 | "after child exec]\n"), pidstr.c_str ()); |
6f259a23 | 998 | } |
6c95b8df | 999 | else |
6f259a23 DB |
1000 | { |
1001 | fprintf_filtered (gdb_stdlog, | |
f67c0c91 | 1002 | _("[Detaching vfork parent %s " |
a068643d | 1003 | "after child exit]\n"), pidstr.c_str ()); |
6f259a23 | 1004 | } |
6c95b8df PA |
1005 | } |
1006 | ||
b73715df | 1007 | target_detach (vfork_parent, 0); |
6c95b8df PA |
1008 | |
1009 | /* Put it back. */ | |
1010 | inf->pspace = pspace; | |
1011 | inf->aspace = aspace; | |
6c95b8df PA |
1012 | } |
1013 | else if (exec) | |
1014 | { | |
1015 | /* We're staying attached to the parent, so, really give the | |
1016 | child a new address space. */ | |
564b1e3f | 1017 | inf->pspace = new program_space (maybe_new_address_space ()); |
6c95b8df PA |
1018 | inf->aspace = inf->pspace->aspace; |
1019 | inf->removable = 1; | |
1020 | set_current_program_space (inf->pspace); | |
1021 | ||
b73715df | 1022 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1023 | } |
1024 | else | |
1025 | { | |
6c95b8df PA |
1026 | /* If this is a vfork child exiting, then the pspace and |
1027 | aspaces were shared with the parent. Since we're | |
1028 | reporting the process exit, we'll be mourning all that is | |
1029 | found in the address space, and switching to null_ptid, | |
1030 | preparing to start a new inferior. But, since we don't | |
1031 | want to clobber the parent's address/program spaces, we | |
1032 | go ahead and create a new one for this exiting | |
1033 | inferior. */ | |
1034 | ||
5ed8105e PA |
1035 | /* Switch to null_ptid while running clone_program_space, so |
1036 | that clone_program_space doesn't want to read the | |
1037 | selected frame of a dead process. */ | |
1038 | scoped_restore restore_ptid | |
1039 | = make_scoped_restore (&inferior_ptid, null_ptid); | |
6c95b8df | 1040 | |
53af73bf PA |
1041 | inf->pspace = new program_space (maybe_new_address_space ()); |
1042 | inf->aspace = inf->pspace->aspace; | |
1043 | set_current_program_space (inf->pspace); | |
6c95b8df | 1044 | inf->removable = 1; |
7dcd53a0 | 1045 | inf->symfile_flags = SYMFILE_NO_READ; |
53af73bf | 1046 | clone_program_space (inf->pspace, vfork_parent->pspace); |
6c95b8df | 1047 | |
b73715df | 1048 | resume_parent = vfork_parent->pid; |
6c95b8df PA |
1049 | } |
1050 | ||
6c95b8df PA |
1051 | gdb_assert (current_program_space == inf->pspace); |
1052 | ||
1053 | if (non_stop && resume_parent != -1) | |
1054 | { | |
1055 | /* If the user wanted the parent to be running, let it go | |
1056 | free now. */ | |
5ed8105e | 1057 | scoped_restore_current_thread restore_thread; |
6c95b8df PA |
1058 | |
1059 | if (debug_infrun) | |
3e43a32a MS |
1060 | fprintf_unfiltered (gdb_stdlog, |
1061 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
1062 | resume_parent); |
1063 | ||
1064 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
6c95b8df PA |
1065 | } |
1066 | } | |
1067 | } | |
1068 | ||
eb6c553b | 1069 | /* Enum strings for "set|show follow-exec-mode". */ |
6c95b8df PA |
1070 | |
1071 | static const char follow_exec_mode_new[] = "new"; | |
1072 | static const char follow_exec_mode_same[] = "same"; | |
40478521 | 1073 | static const char *const follow_exec_mode_names[] = |
6c95b8df PA |
1074 | { |
1075 | follow_exec_mode_new, | |
1076 | follow_exec_mode_same, | |
1077 | NULL, | |
1078 | }; | |
1079 | ||
1080 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
1081 | static void | |
1082 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
1083 | struct cmd_list_element *c, const char *value) | |
1084 | { | |
1085 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
1086 | } | |
1087 | ||
ecf45d2c | 1088 | /* EXEC_FILE_TARGET is assumed to be non-NULL. */ |
1adeb98a | 1089 | |
c906108c | 1090 | static void |
4ca51187 | 1091 | follow_exec (ptid_t ptid, const char *exec_file_target) |
c906108c | 1092 | { |
6c95b8df | 1093 | struct inferior *inf = current_inferior (); |
e99b03dc | 1094 | int pid = ptid.pid (); |
94585166 | 1095 | ptid_t process_ptid; |
7a292a7a | 1096 | |
65d2b333 PW |
1097 | /* Switch terminal for any messages produced e.g. by |
1098 | breakpoint_re_set. */ | |
1099 | target_terminal::ours_for_output (); | |
1100 | ||
c906108c SS |
1101 | /* This is an exec event that we actually wish to pay attention to. |
1102 | Refresh our symbol table to the newly exec'd program, remove any | |
1103 | momentary bp's, etc. | |
1104 | ||
1105 | If there are breakpoints, they aren't really inserted now, | |
1106 | since the exec() transformed our inferior into a fresh set | |
1107 | of instructions. | |
1108 | ||
1109 | We want to preserve symbolic breakpoints on the list, since | |
1110 | we have hopes that they can be reset after the new a.out's | |
1111 | symbol table is read. | |
1112 | ||
1113 | However, any "raw" breakpoints must be removed from the list | |
1114 | (e.g., the solib bp's), since their address is probably invalid | |
1115 | now. | |
1116 | ||
1117 | And, we DON'T want to call delete_breakpoints() here, since | |
1118 | that may write the bp's "shadow contents" (the instruction | |
85102364 | 1119 | value that was overwritten with a TRAP instruction). Since |
1777feb0 | 1120 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
1121 | |
1122 | mark_breakpoints_out (); | |
1123 | ||
95e50b27 PA |
1124 | /* The target reports the exec event to the main thread, even if |
1125 | some other thread does the exec, and even if the main thread was | |
1126 | stopped or already gone. We may still have non-leader threads of | |
1127 | the process on our list. E.g., on targets that don't have thread | |
1128 | exit events (like remote); or on native Linux in non-stop mode if | |
1129 | there were only two threads in the inferior and the non-leader | |
1130 | one is the one that execs (and nothing forces an update of the | |
1131 | thread list up to here). When debugging remotely, it's best to | |
1132 | avoid extra traffic, when possible, so avoid syncing the thread | |
1133 | list with the target, and instead go ahead and delete all threads | |
1134 | of the process but one that reported the event. Note this must | |
1135 | be done before calling update_breakpoints_after_exec, as | |
1136 | otherwise clearing the threads' resources would reference stale | |
1137 | thread breakpoints -- it may have been one of these threads that | |
1138 | stepped across the exec. We could just clear their stepping | |
1139 | states, but as long as we're iterating, might as well delete | |
1140 | them. Deleting them now rather than at the next user-visible | |
1141 | stop provides a nicer sequence of events for user and MI | |
1142 | notifications. */ | |
08036331 | 1143 | for (thread_info *th : all_threads_safe ()) |
d7e15655 | 1144 | if (th->ptid.pid () == pid && th->ptid != ptid) |
00431a78 | 1145 | delete_thread (th); |
95e50b27 PA |
1146 | |
1147 | /* We also need to clear any left over stale state for the | |
1148 | leader/event thread. E.g., if there was any step-resume | |
1149 | breakpoint or similar, it's gone now. We cannot truly | |
1150 | step-to-next statement through an exec(). */ | |
08036331 | 1151 | thread_info *th = inferior_thread (); |
8358c15c | 1152 | th->control.step_resume_breakpoint = NULL; |
186c406b | 1153 | th->control.exception_resume_breakpoint = NULL; |
34b7e8a6 | 1154 | th->control.single_step_breakpoints = NULL; |
16c381f0 JK |
1155 | th->control.step_range_start = 0; |
1156 | th->control.step_range_end = 0; | |
c906108c | 1157 | |
95e50b27 PA |
1158 | /* The user may have had the main thread held stopped in the |
1159 | previous image (e.g., schedlock on, or non-stop). Release | |
1160 | it now. */ | |
a75724bc PA |
1161 | th->stop_requested = 0; |
1162 | ||
95e50b27 PA |
1163 | update_breakpoints_after_exec (); |
1164 | ||
1777feb0 | 1165 | /* What is this a.out's name? */ |
f2907e49 | 1166 | process_ptid = ptid_t (pid); |
6c95b8df | 1167 | printf_unfiltered (_("%s is executing new program: %s\n"), |
a068643d | 1168 | target_pid_to_str (process_ptid).c_str (), |
ecf45d2c | 1169 | exec_file_target); |
c906108c SS |
1170 | |
1171 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 1172 | inferior has essentially been killed & reborn. */ |
7a292a7a | 1173 | |
6ca15a4b | 1174 | breakpoint_init_inferior (inf_execd); |
e85a822c | 1175 | |
797bc1cb TT |
1176 | gdb::unique_xmalloc_ptr<char> exec_file_host |
1177 | = exec_file_find (exec_file_target, NULL); | |
ff862be4 | 1178 | |
ecf45d2c SL |
1179 | /* If we were unable to map the executable target pathname onto a host |
1180 | pathname, tell the user that. Otherwise GDB's subsequent behavior | |
1181 | is confusing. Maybe it would even be better to stop at this point | |
1182 | so that the user can specify a file manually before continuing. */ | |
1183 | if (exec_file_host == NULL) | |
1184 | warning (_("Could not load symbols for executable %s.\n" | |
1185 | "Do you need \"set sysroot\"?"), | |
1186 | exec_file_target); | |
c906108c | 1187 | |
cce9b6bf PA |
1188 | /* Reset the shared library package. This ensures that we get a |
1189 | shlib event when the child reaches "_start", at which point the | |
1190 | dld will have had a chance to initialize the child. */ | |
1191 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
1192 | we don't want those to be satisfied by the libraries of the | |
1193 | previous incarnation of this process. */ | |
1194 | no_shared_libraries (NULL, 0); | |
1195 | ||
6c95b8df PA |
1196 | if (follow_exec_mode_string == follow_exec_mode_new) |
1197 | { | |
6c95b8df PA |
1198 | /* The user wants to keep the old inferior and program spaces |
1199 | around. Create a new fresh one, and switch to it. */ | |
1200 | ||
35ed81d4 SM |
1201 | /* Do exit processing for the original inferior before setting the new |
1202 | inferior's pid. Having two inferiors with the same pid would confuse | |
1203 | find_inferior_p(t)id. Transfer the terminal state and info from the | |
1204 | old to the new inferior. */ | |
1205 | inf = add_inferior_with_spaces (); | |
1206 | swap_terminal_info (inf, current_inferior ()); | |
057302ce | 1207 | exit_inferior_silent (current_inferior ()); |
17d8546e | 1208 | |
94585166 | 1209 | inf->pid = pid; |
ecf45d2c | 1210 | target_follow_exec (inf, exec_file_target); |
6c95b8df | 1211 | |
5b6d1e4f PA |
1212 | inferior *org_inferior = current_inferior (); |
1213 | switch_to_inferior_no_thread (inf); | |
1214 | push_target (org_inferior->process_target ()); | |
1215 | thread_info *thr = add_thread (inf->process_target (), ptid); | |
1216 | switch_to_thread (thr); | |
6c95b8df | 1217 | } |
9107fc8d PA |
1218 | else |
1219 | { | |
1220 | /* The old description may no longer be fit for the new image. | |
1221 | E.g, a 64-bit process exec'ed a 32-bit process. Clear the | |
1222 | old description; we'll read a new one below. No need to do | |
1223 | this on "follow-exec-mode new", as the old inferior stays | |
1224 | around (its description is later cleared/refetched on | |
1225 | restart). */ | |
1226 | target_clear_description (); | |
1227 | } | |
6c95b8df PA |
1228 | |
1229 | gdb_assert (current_program_space == inf->pspace); | |
1230 | ||
ecf45d2c SL |
1231 | /* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used |
1232 | because the proper displacement for a PIE (Position Independent | |
1233 | Executable) main symbol file will only be computed by | |
1234 | solib_create_inferior_hook below. breakpoint_re_set would fail | |
1235 | to insert the breakpoints with the zero displacement. */ | |
797bc1cb | 1236 | try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET); |
c906108c | 1237 | |
9107fc8d PA |
1238 | /* If the target can specify a description, read it. Must do this |
1239 | after flipping to the new executable (because the target supplied | |
1240 | description must be compatible with the executable's | |
1241 | architecture, and the old executable may e.g., be 32-bit, while | |
1242 | the new one 64-bit), and before anything involving memory or | |
1243 | registers. */ | |
1244 | target_find_description (); | |
1245 | ||
268a4a75 | 1246 | solib_create_inferior_hook (0); |
c906108c | 1247 | |
4efc6507 DE |
1248 | jit_inferior_created_hook (); |
1249 | ||
c1e56572 JK |
1250 | breakpoint_re_set (); |
1251 | ||
c906108c SS |
1252 | /* Reinsert all breakpoints. (Those which were symbolic have |
1253 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 1254 | to symbol_file_command...). */ |
c906108c SS |
1255 | insert_breakpoints (); |
1256 | ||
1257 | /* The next resume of this inferior should bring it to the shlib | |
1258 | startup breakpoints. (If the user had also set bp's on | |
1259 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 1260 | matically get reset there in the new process.). */ |
c906108c SS |
1261 | } |
1262 | ||
c2829269 PA |
1263 | /* The queue of threads that need to do a step-over operation to get |
1264 | past e.g., a breakpoint. What technique is used to step over the | |
1265 | breakpoint/watchpoint does not matter -- all threads end up in the | |
1266 | same queue, to maintain rough temporal order of execution, in order | |
1267 | to avoid starvation, otherwise, we could e.g., find ourselves | |
1268 | constantly stepping the same couple threads past their breakpoints | |
1269 | over and over, if the single-step finish fast enough. */ | |
1270 | struct thread_info *step_over_queue_head; | |
1271 | ||
6c4cfb24 PA |
1272 | /* Bit flags indicating what the thread needs to step over. */ |
1273 | ||
8d297bbf | 1274 | enum step_over_what_flag |
6c4cfb24 PA |
1275 | { |
1276 | /* Step over a breakpoint. */ | |
1277 | STEP_OVER_BREAKPOINT = 1, | |
1278 | ||
1279 | /* Step past a non-continuable watchpoint, in order to let the | |
1280 | instruction execute so we can evaluate the watchpoint | |
1281 | expression. */ | |
1282 | STEP_OVER_WATCHPOINT = 2 | |
1283 | }; | |
8d297bbf | 1284 | DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what); |
6c4cfb24 | 1285 | |
963f9c80 | 1286 | /* Info about an instruction that is being stepped over. */ |
31e77af2 PA |
1287 | |
1288 | struct step_over_info | |
1289 | { | |
963f9c80 PA |
1290 | /* If we're stepping past a breakpoint, this is the address space |
1291 | and address of the instruction the breakpoint is set at. We'll | |
1292 | skip inserting all breakpoints here. Valid iff ASPACE is | |
1293 | non-NULL. */ | |
8b86c959 | 1294 | const address_space *aspace; |
31e77af2 | 1295 | CORE_ADDR address; |
963f9c80 PA |
1296 | |
1297 | /* The instruction being stepped over triggers a nonsteppable | |
1298 | watchpoint. If true, we'll skip inserting watchpoints. */ | |
1299 | int nonsteppable_watchpoint_p; | |
21edc42f YQ |
1300 | |
1301 | /* The thread's global number. */ | |
1302 | int thread; | |
31e77af2 PA |
1303 | }; |
1304 | ||
1305 | /* The step-over info of the location that is being stepped over. | |
1306 | ||
1307 | Note that with async/breakpoint always-inserted mode, a user might | |
1308 | set a new breakpoint/watchpoint/etc. exactly while a breakpoint is | |
1309 | being stepped over. As setting a new breakpoint inserts all | |
1310 | breakpoints, we need to make sure the breakpoint being stepped over | |
1311 | isn't inserted then. We do that by only clearing the step-over | |
1312 | info when the step-over is actually finished (or aborted). | |
1313 | ||
1314 | Presently GDB can only step over one breakpoint at any given time. | |
1315 | Given threads that can't run code in the same address space as the | |
1316 | breakpoint's can't really miss the breakpoint, GDB could be taught | |
1317 | to step-over at most one breakpoint per address space (so this info | |
1318 | could move to the address space object if/when GDB is extended). | |
1319 | The set of breakpoints being stepped over will normally be much | |
1320 | smaller than the set of all breakpoints, so a flag in the | |
1321 | breakpoint location structure would be wasteful. A separate list | |
1322 | also saves complexity and run-time, as otherwise we'd have to go | |
1323 | through all breakpoint locations clearing their flag whenever we | |
1324 | start a new sequence. Similar considerations weigh against storing | |
1325 | this info in the thread object. Plus, not all step overs actually | |
1326 | have breakpoint locations -- e.g., stepping past a single-step | |
1327 | breakpoint, or stepping to complete a non-continuable | |
1328 | watchpoint. */ | |
1329 | static struct step_over_info step_over_info; | |
1330 | ||
1331 | /* Record the address of the breakpoint/instruction we're currently | |
ce0db137 DE |
1332 | stepping over. |
1333 | N.B. We record the aspace and address now, instead of say just the thread, | |
1334 | because when we need the info later the thread may be running. */ | |
31e77af2 PA |
1335 | |
1336 | static void | |
8b86c959 | 1337 | set_step_over_info (const address_space *aspace, CORE_ADDR address, |
21edc42f YQ |
1338 | int nonsteppable_watchpoint_p, |
1339 | int thread) | |
31e77af2 PA |
1340 | { |
1341 | step_over_info.aspace = aspace; | |
1342 | step_over_info.address = address; | |
963f9c80 | 1343 | step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p; |
21edc42f | 1344 | step_over_info.thread = thread; |
31e77af2 PA |
1345 | } |
1346 | ||
1347 | /* Called when we're not longer stepping over a breakpoint / an | |
1348 | instruction, so all breakpoints are free to be (re)inserted. */ | |
1349 | ||
1350 | static void | |
1351 | clear_step_over_info (void) | |
1352 | { | |
372316f1 PA |
1353 | if (debug_infrun) |
1354 | fprintf_unfiltered (gdb_stdlog, | |
1355 | "infrun: clear_step_over_info\n"); | |
31e77af2 PA |
1356 | step_over_info.aspace = NULL; |
1357 | step_over_info.address = 0; | |
963f9c80 | 1358 | step_over_info.nonsteppable_watchpoint_p = 0; |
21edc42f | 1359 | step_over_info.thread = -1; |
31e77af2 PA |
1360 | } |
1361 | ||
7f89fd65 | 1362 | /* See infrun.h. */ |
31e77af2 PA |
1363 | |
1364 | int | |
1365 | stepping_past_instruction_at (struct address_space *aspace, | |
1366 | CORE_ADDR address) | |
1367 | { | |
1368 | return (step_over_info.aspace != NULL | |
1369 | && breakpoint_address_match (aspace, address, | |
1370 | step_over_info.aspace, | |
1371 | step_over_info.address)); | |
1372 | } | |
1373 | ||
963f9c80 PA |
1374 | /* See infrun.h. */ |
1375 | ||
21edc42f YQ |
1376 | int |
1377 | thread_is_stepping_over_breakpoint (int thread) | |
1378 | { | |
1379 | return (step_over_info.thread != -1 | |
1380 | && thread == step_over_info.thread); | |
1381 | } | |
1382 | ||
1383 | /* See infrun.h. */ | |
1384 | ||
963f9c80 PA |
1385 | int |
1386 | stepping_past_nonsteppable_watchpoint (void) | |
1387 | { | |
1388 | return step_over_info.nonsteppable_watchpoint_p; | |
1389 | } | |
1390 | ||
6cc83d2a PA |
1391 | /* Returns true if step-over info is valid. */ |
1392 | ||
1393 | static int | |
1394 | step_over_info_valid_p (void) | |
1395 | { | |
963f9c80 PA |
1396 | return (step_over_info.aspace != NULL |
1397 | || stepping_past_nonsteppable_watchpoint ()); | |
6cc83d2a PA |
1398 | } |
1399 | ||
c906108c | 1400 | \f |
237fc4c9 PA |
1401 | /* Displaced stepping. */ |
1402 | ||
1403 | /* In non-stop debugging mode, we must take special care to manage | |
1404 | breakpoints properly; in particular, the traditional strategy for | |
1405 | stepping a thread past a breakpoint it has hit is unsuitable. | |
1406 | 'Displaced stepping' is a tactic for stepping one thread past a | |
1407 | breakpoint it has hit while ensuring that other threads running | |
1408 | concurrently will hit the breakpoint as they should. | |
1409 | ||
1410 | The traditional way to step a thread T off a breakpoint in a | |
1411 | multi-threaded program in all-stop mode is as follows: | |
1412 | ||
1413 | a0) Initially, all threads are stopped, and breakpoints are not | |
1414 | inserted. | |
1415 | a1) We single-step T, leaving breakpoints uninserted. | |
1416 | a2) We insert breakpoints, and resume all threads. | |
1417 | ||
1418 | In non-stop debugging, however, this strategy is unsuitable: we | |
1419 | don't want to have to stop all threads in the system in order to | |
1420 | continue or step T past a breakpoint. Instead, we use displaced | |
1421 | stepping: | |
1422 | ||
1423 | n0) Initially, T is stopped, other threads are running, and | |
1424 | breakpoints are inserted. | |
1425 | n1) We copy the instruction "under" the breakpoint to a separate | |
1426 | location, outside the main code stream, making any adjustments | |
1427 | to the instruction, register, and memory state as directed by | |
1428 | T's architecture. | |
1429 | n2) We single-step T over the instruction at its new location. | |
1430 | n3) We adjust the resulting register and memory state as directed | |
1431 | by T's architecture. This includes resetting T's PC to point | |
1432 | back into the main instruction stream. | |
1433 | n4) We resume T. | |
1434 | ||
1435 | This approach depends on the following gdbarch methods: | |
1436 | ||
1437 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
1438 | indicate where to copy the instruction, and how much space must | |
1439 | be reserved there. We use these in step n1. | |
1440 | ||
1441 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
1442 | address, and makes any necessary adjustments to the instruction, | |
1443 | register contents, and memory. We use this in step n1. | |
1444 | ||
1445 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
85102364 | 1446 | we have successfully single-stepped the instruction, to yield the |
237fc4c9 PA |
1447 | same effect the instruction would have had if we had executed it |
1448 | at its original address. We use this in step n3. | |
1449 | ||
237fc4c9 PA |
1450 | The gdbarch_displaced_step_copy_insn and |
1451 | gdbarch_displaced_step_fixup functions must be written so that | |
1452 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1453 | single-stepping across the copied instruction, and then applying | |
1454 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1455 | thread's memory and registers as stepping the instruction in place | |
1456 | would have. Exactly which responsibilities fall to the copy and | |
1457 | which fall to the fixup is up to the author of those functions. | |
1458 | ||
1459 | See the comments in gdbarch.sh for details. | |
1460 | ||
1461 | Note that displaced stepping and software single-step cannot | |
1462 | currently be used in combination, although with some care I think | |
1463 | they could be made to. Software single-step works by placing | |
1464 | breakpoints on all possible subsequent instructions; if the | |
1465 | displaced instruction is a PC-relative jump, those breakpoints | |
1466 | could fall in very strange places --- on pages that aren't | |
1467 | executable, or at addresses that are not proper instruction | |
1468 | boundaries. (We do generally let other threads run while we wait | |
1469 | to hit the software single-step breakpoint, and they might | |
1470 | encounter such a corrupted instruction.) One way to work around | |
1471 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1472 | simulate the effect of PC-relative instructions (and return NULL) | |
1473 | on architectures that use software single-stepping. | |
1474 | ||
1475 | In non-stop mode, we can have independent and simultaneous step | |
1476 | requests, so more than one thread may need to simultaneously step | |
1477 | over a breakpoint. The current implementation assumes there is | |
1478 | only one scratch space per process. In this case, we have to | |
1479 | serialize access to the scratch space. If thread A wants to step | |
1480 | over a breakpoint, but we are currently waiting for some other | |
1481 | thread to complete a displaced step, we leave thread A stopped and | |
1482 | place it in the displaced_step_request_queue. Whenever a displaced | |
1483 | step finishes, we pick the next thread in the queue and start a new | |
1484 | displaced step operation on it. See displaced_step_prepare and | |
1485 | displaced_step_fixup for details. */ | |
1486 | ||
cfba9872 SM |
1487 | /* Default destructor for displaced_step_closure. */ |
1488 | ||
1489 | displaced_step_closure::~displaced_step_closure () = default; | |
1490 | ||
fc1cf338 PA |
1491 | /* Get the displaced stepping state of process PID. */ |
1492 | ||
39a36629 | 1493 | static displaced_step_inferior_state * |
00431a78 | 1494 | get_displaced_stepping_state (inferior *inf) |
fc1cf338 | 1495 | { |
d20172fc | 1496 | return &inf->displaced_step_state; |
fc1cf338 PA |
1497 | } |
1498 | ||
372316f1 PA |
1499 | /* Returns true if any inferior has a thread doing a displaced |
1500 | step. */ | |
1501 | ||
39a36629 SM |
1502 | static bool |
1503 | displaced_step_in_progress_any_inferior () | |
372316f1 | 1504 | { |
d20172fc | 1505 | for (inferior *i : all_inferiors ()) |
39a36629 | 1506 | { |
d20172fc | 1507 | if (i->displaced_step_state.step_thread != nullptr) |
39a36629 SM |
1508 | return true; |
1509 | } | |
372316f1 | 1510 | |
39a36629 | 1511 | return false; |
372316f1 PA |
1512 | } |
1513 | ||
c0987663 YQ |
1514 | /* Return true if thread represented by PTID is doing a displaced |
1515 | step. */ | |
1516 | ||
1517 | static int | |
00431a78 | 1518 | displaced_step_in_progress_thread (thread_info *thread) |
c0987663 | 1519 | { |
00431a78 | 1520 | gdb_assert (thread != NULL); |
c0987663 | 1521 | |
d20172fc | 1522 | return get_displaced_stepping_state (thread->inf)->step_thread == thread; |
c0987663 YQ |
1523 | } |
1524 | ||
8f572e5c PA |
1525 | /* Return true if process PID has a thread doing a displaced step. */ |
1526 | ||
1527 | static int | |
00431a78 | 1528 | displaced_step_in_progress (inferior *inf) |
8f572e5c | 1529 | { |
d20172fc | 1530 | return get_displaced_stepping_state (inf)->step_thread != nullptr; |
fc1cf338 PA |
1531 | } |
1532 | ||
a42244db YQ |
1533 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1534 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1535 | return NULL. */ | |
1536 | ||
1537 | struct displaced_step_closure* | |
1538 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1539 | { | |
d20172fc | 1540 | displaced_step_inferior_state *displaced |
00431a78 | 1541 | = get_displaced_stepping_state (current_inferior ()); |
a42244db YQ |
1542 | |
1543 | /* If checking the mode of displaced instruction in copy area. */ | |
d20172fc | 1544 | if (displaced->step_thread != nullptr |
00431a78 | 1545 | && displaced->step_copy == addr) |
d8d83535 | 1546 | return displaced->step_closure.get (); |
a42244db YQ |
1547 | |
1548 | return NULL; | |
1549 | } | |
1550 | ||
fc1cf338 PA |
1551 | static void |
1552 | infrun_inferior_exit (struct inferior *inf) | |
1553 | { | |
d20172fc | 1554 | inf->displaced_step_state.reset (); |
fc1cf338 | 1555 | } |
237fc4c9 | 1556 | |
fff08868 HZ |
1557 | /* If ON, and the architecture supports it, GDB will use displaced |
1558 | stepping to step over breakpoints. If OFF, or if the architecture | |
1559 | doesn't support it, GDB will instead use the traditional | |
1560 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1561 | decide which technique to use to step over breakpoints depending on | |
9822cb57 | 1562 | whether the target works in a non-stop way (see use_displaced_stepping). */ |
fff08868 | 1563 | |
72d0e2c5 | 1564 | static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO; |
fff08868 | 1565 | |
237fc4c9 PA |
1566 | static void |
1567 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1568 | struct cmd_list_element *c, | |
1569 | const char *value) | |
1570 | { | |
72d0e2c5 | 1571 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO) |
3e43a32a MS |
1572 | fprintf_filtered (file, |
1573 | _("Debugger's willingness to use displaced stepping " | |
1574 | "to step over breakpoints is %s (currently %s).\n"), | |
fbea99ea | 1575 | value, target_is_non_stop_p () ? "on" : "off"); |
fff08868 | 1576 | else |
3e43a32a MS |
1577 | fprintf_filtered (file, |
1578 | _("Debugger's willingness to use displaced stepping " | |
1579 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1580 | } |
1581 | ||
9822cb57 SM |
1582 | /* Return true if the gdbarch implements the required methods to use |
1583 | displaced stepping. */ | |
1584 | ||
1585 | static bool | |
1586 | gdbarch_supports_displaced_stepping (gdbarch *arch) | |
1587 | { | |
1588 | /* Only check for the presence of step_copy_insn. Other required methods | |
1589 | are checked by the gdbarch validation. */ | |
1590 | return gdbarch_displaced_step_copy_insn_p (arch); | |
1591 | } | |
1592 | ||
fff08868 | 1593 | /* Return non-zero if displaced stepping can/should be used to step |
3fc8eb30 | 1594 | over breakpoints of thread TP. */ |
fff08868 | 1595 | |
9822cb57 SM |
1596 | static bool |
1597 | use_displaced_stepping (thread_info *tp) | |
237fc4c9 | 1598 | { |
9822cb57 SM |
1599 | /* If the user disabled it explicitly, don't use displaced stepping. */ |
1600 | if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE) | |
1601 | return false; | |
1602 | ||
1603 | /* If "auto", only use displaced stepping if the target operates in a non-stop | |
1604 | way. */ | |
1605 | if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO | |
1606 | && !target_is_non_stop_p ()) | |
1607 | return false; | |
1608 | ||
1609 | gdbarch *gdbarch = get_thread_regcache (tp)->arch (); | |
1610 | ||
1611 | /* If the architecture doesn't implement displaced stepping, don't use | |
1612 | it. */ | |
1613 | if (!gdbarch_supports_displaced_stepping (gdbarch)) | |
1614 | return false; | |
1615 | ||
1616 | /* If recording, don't use displaced stepping. */ | |
1617 | if (find_record_target () != nullptr) | |
1618 | return false; | |
1619 | ||
d20172fc SM |
1620 | displaced_step_inferior_state *displaced_state |
1621 | = get_displaced_stepping_state (tp->inf); | |
3fc8eb30 | 1622 | |
9822cb57 SM |
1623 | /* If displaced stepping failed before for this inferior, don't bother trying |
1624 | again. */ | |
1625 | if (displaced_state->failed_before) | |
1626 | return false; | |
1627 | ||
1628 | return true; | |
237fc4c9 PA |
1629 | } |
1630 | ||
d8d83535 SM |
1631 | /* Simple function wrapper around displaced_step_inferior_state::reset. */ |
1632 | ||
237fc4c9 | 1633 | static void |
d8d83535 | 1634 | displaced_step_reset (displaced_step_inferior_state *displaced) |
237fc4c9 | 1635 | { |
d8d83535 | 1636 | displaced->reset (); |
237fc4c9 PA |
1637 | } |
1638 | ||
d8d83535 SM |
1639 | /* A cleanup that wraps displaced_step_reset. We use this instead of, say, |
1640 | SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */ | |
1641 | ||
1642 | using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset); | |
237fc4c9 PA |
1643 | |
1644 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1645 | void | |
1646 | displaced_step_dump_bytes (struct ui_file *file, | |
1647 | const gdb_byte *buf, | |
1648 | size_t len) | |
1649 | { | |
1650 | int i; | |
1651 | ||
1652 | for (i = 0; i < len; i++) | |
1653 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1654 | fputs_unfiltered ("\n", file); | |
1655 | } | |
1656 | ||
1657 | /* Prepare to single-step, using displaced stepping. | |
1658 | ||
1659 | Note that we cannot use displaced stepping when we have a signal to | |
1660 | deliver. If we have a signal to deliver and an instruction to step | |
1661 | over, then after the step, there will be no indication from the | |
1662 | target whether the thread entered a signal handler or ignored the | |
1663 | signal and stepped over the instruction successfully --- both cases | |
1664 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1665 | fixup, and in the second case we must --- but we can't tell which. | |
1666 | Comments in the code for 'random signals' in handle_inferior_event | |
1667 | explain how we handle this case instead. | |
1668 | ||
1669 | Returns 1 if preparing was successful -- this thread is going to be | |
7f03bd92 PA |
1670 | stepped now; 0 if displaced stepping this thread got queued; or -1 |
1671 | if this instruction can't be displaced stepped. */ | |
1672 | ||
237fc4c9 | 1673 | static int |
00431a78 | 1674 | displaced_step_prepare_throw (thread_info *tp) |
237fc4c9 | 1675 | { |
00431a78 | 1676 | regcache *regcache = get_thread_regcache (tp); |
ac7936df | 1677 | struct gdbarch *gdbarch = regcache->arch (); |
8b86c959 | 1678 | const address_space *aspace = regcache->aspace (); |
237fc4c9 PA |
1679 | CORE_ADDR original, copy; |
1680 | ULONGEST len; | |
9e529e1d | 1681 | int status; |
237fc4c9 PA |
1682 | |
1683 | /* We should never reach this function if the architecture does not | |
1684 | support displaced stepping. */ | |
9822cb57 | 1685 | gdb_assert (gdbarch_supports_displaced_stepping (gdbarch)); |
237fc4c9 | 1686 | |
c2829269 PA |
1687 | /* Nor if the thread isn't meant to step over a breakpoint. */ |
1688 | gdb_assert (tp->control.trap_expected); | |
1689 | ||
c1e36e3e PA |
1690 | /* Disable range stepping while executing in the scratch pad. We |
1691 | want a single-step even if executing the displaced instruction in | |
1692 | the scratch buffer lands within the stepping range (e.g., a | |
1693 | jump/branch). */ | |
1694 | tp->control.may_range_step = 0; | |
1695 | ||
fc1cf338 PA |
1696 | /* We have to displaced step one thread at a time, as we only have |
1697 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1698 | |
d20172fc SM |
1699 | displaced_step_inferior_state *displaced |
1700 | = get_displaced_stepping_state (tp->inf); | |
fc1cf338 | 1701 | |
00431a78 | 1702 | if (displaced->step_thread != nullptr) |
237fc4c9 PA |
1703 | { |
1704 | /* Already waiting for a displaced step to finish. Defer this | |
1705 | request and place in queue. */ | |
237fc4c9 PA |
1706 | |
1707 | if (debug_displaced) | |
1708 | fprintf_unfiltered (gdb_stdlog, | |
c2829269 | 1709 | "displaced: deferring step of %s\n", |
a068643d | 1710 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 | 1711 | |
c2829269 | 1712 | thread_step_over_chain_enqueue (tp); |
237fc4c9 PA |
1713 | return 0; |
1714 | } | |
1715 | else | |
1716 | { | |
1717 | if (debug_displaced) | |
1718 | fprintf_unfiltered (gdb_stdlog, | |
1719 | "displaced: stepping %s now\n", | |
a068643d | 1720 | target_pid_to_str (tp->ptid).c_str ()); |
237fc4c9 PA |
1721 | } |
1722 | ||
d8d83535 | 1723 | displaced_step_reset (displaced); |
237fc4c9 | 1724 | |
00431a78 PA |
1725 | scoped_restore_current_thread restore_thread; |
1726 | ||
1727 | switch_to_thread (tp); | |
ad53cd71 | 1728 | |
515630c5 | 1729 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1730 | |
1731 | copy = gdbarch_displaced_step_location (gdbarch); | |
1732 | len = gdbarch_max_insn_length (gdbarch); | |
1733 | ||
d35ae833 PA |
1734 | if (breakpoint_in_range_p (aspace, copy, len)) |
1735 | { | |
1736 | /* There's a breakpoint set in the scratch pad location range | |
1737 | (which is usually around the entry point). We'd either | |
1738 | install it before resuming, which would overwrite/corrupt the | |
1739 | scratch pad, or if it was already inserted, this displaced | |
1740 | step would overwrite it. The latter is OK in the sense that | |
1741 | we already assume that no thread is going to execute the code | |
1742 | in the scratch pad range (after initial startup) anyway, but | |
1743 | the former is unacceptable. Simply punt and fallback to | |
1744 | stepping over this breakpoint in-line. */ | |
1745 | if (debug_displaced) | |
1746 | { | |
1747 | fprintf_unfiltered (gdb_stdlog, | |
1748 | "displaced: breakpoint set in scratch pad. " | |
1749 | "Stepping over breakpoint in-line instead.\n"); | |
1750 | } | |
1751 | ||
d35ae833 PA |
1752 | return -1; |
1753 | } | |
1754 | ||
237fc4c9 | 1755 | /* Save the original contents of the copy area. */ |
d20172fc SM |
1756 | displaced->step_saved_copy.resize (len); |
1757 | status = target_read_memory (copy, displaced->step_saved_copy.data (), len); | |
9e529e1d JK |
1758 | if (status != 0) |
1759 | throw_error (MEMORY_ERROR, | |
1760 | _("Error accessing memory address %s (%s) for " | |
1761 | "displaced-stepping scratch space."), | |
1762 | paddress (gdbarch, copy), safe_strerror (status)); | |
237fc4c9 PA |
1763 | if (debug_displaced) |
1764 | { | |
5af949e3 UW |
1765 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1766 | paddress (gdbarch, copy)); | |
fc1cf338 | 1767 | displaced_step_dump_bytes (gdb_stdlog, |
d20172fc | 1768 | displaced->step_saved_copy.data (), |
fc1cf338 | 1769 | len); |
237fc4c9 PA |
1770 | }; |
1771 | ||
e8217e61 SM |
1772 | displaced->step_closure |
1773 | = gdbarch_displaced_step_copy_insn (gdbarch, original, copy, regcache); | |
1774 | if (displaced->step_closure == NULL) | |
7f03bd92 PA |
1775 | { |
1776 | /* The architecture doesn't know how or want to displaced step | |
1777 | this instruction or instruction sequence. Fallback to | |
1778 | stepping over the breakpoint in-line. */ | |
7f03bd92 PA |
1779 | return -1; |
1780 | } | |
237fc4c9 | 1781 | |
9f5a595d UW |
1782 | /* Save the information we need to fix things up if the step |
1783 | succeeds. */ | |
00431a78 | 1784 | displaced->step_thread = tp; |
fc1cf338 | 1785 | displaced->step_gdbarch = gdbarch; |
fc1cf338 PA |
1786 | displaced->step_original = original; |
1787 | displaced->step_copy = copy; | |
9f5a595d | 1788 | |
9799571e | 1789 | { |
d8d83535 | 1790 | displaced_step_reset_cleanup cleanup (displaced); |
237fc4c9 | 1791 | |
9799571e TT |
1792 | /* Resume execution at the copy. */ |
1793 | regcache_write_pc (regcache, copy); | |
237fc4c9 | 1794 | |
9799571e TT |
1795 | cleanup.release (); |
1796 | } | |
ad53cd71 | 1797 | |
237fc4c9 | 1798 | if (debug_displaced) |
5af949e3 UW |
1799 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1800 | paddress (gdbarch, copy)); | |
237fc4c9 | 1801 | |
237fc4c9 PA |
1802 | return 1; |
1803 | } | |
1804 | ||
3fc8eb30 PA |
1805 | /* Wrapper for displaced_step_prepare_throw that disabled further |
1806 | attempts at displaced stepping if we get a memory error. */ | |
1807 | ||
1808 | static int | |
00431a78 | 1809 | displaced_step_prepare (thread_info *thread) |
3fc8eb30 PA |
1810 | { |
1811 | int prepared = -1; | |
1812 | ||
a70b8144 | 1813 | try |
3fc8eb30 | 1814 | { |
00431a78 | 1815 | prepared = displaced_step_prepare_throw (thread); |
3fc8eb30 | 1816 | } |
230d2906 | 1817 | catch (const gdb_exception_error &ex) |
3fc8eb30 PA |
1818 | { |
1819 | struct displaced_step_inferior_state *displaced_state; | |
1820 | ||
16b41842 PA |
1821 | if (ex.error != MEMORY_ERROR |
1822 | && ex.error != NOT_SUPPORTED_ERROR) | |
eedc3f4f | 1823 | throw; |
3fc8eb30 PA |
1824 | |
1825 | if (debug_infrun) | |
1826 | { | |
1827 | fprintf_unfiltered (gdb_stdlog, | |
1828 | "infrun: disabling displaced stepping: %s\n", | |
3d6e9d23 | 1829 | ex.what ()); |
3fc8eb30 PA |
1830 | } |
1831 | ||
1832 | /* Be verbose if "set displaced-stepping" is "on", silent if | |
1833 | "auto". */ | |
1834 | if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE) | |
1835 | { | |
fd7dcb94 | 1836 | warning (_("disabling displaced stepping: %s"), |
3d6e9d23 | 1837 | ex.what ()); |
3fc8eb30 PA |
1838 | } |
1839 | ||
1840 | /* Disable further displaced stepping attempts. */ | |
1841 | displaced_state | |
00431a78 | 1842 | = get_displaced_stepping_state (thread->inf); |
3fc8eb30 PA |
1843 | displaced_state->failed_before = 1; |
1844 | } | |
3fc8eb30 PA |
1845 | |
1846 | return prepared; | |
1847 | } | |
1848 | ||
237fc4c9 | 1849 | static void |
3e43a32a MS |
1850 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1851 | const gdb_byte *myaddr, int len) | |
237fc4c9 | 1852 | { |
2989a365 | 1853 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
abbb1732 | 1854 | |
237fc4c9 PA |
1855 | inferior_ptid = ptid; |
1856 | write_memory (memaddr, myaddr, len); | |
237fc4c9 PA |
1857 | } |
1858 | ||
e2d96639 YQ |
1859 | /* Restore the contents of the copy area for thread PTID. */ |
1860 | ||
1861 | static void | |
1862 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1863 | ptid_t ptid) | |
1864 | { | |
1865 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1866 | ||
1867 | write_memory_ptid (ptid, displaced->step_copy, | |
d20172fc | 1868 | displaced->step_saved_copy.data (), len); |
e2d96639 YQ |
1869 | if (debug_displaced) |
1870 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
a068643d | 1871 | target_pid_to_str (ptid).c_str (), |
e2d96639 YQ |
1872 | paddress (displaced->step_gdbarch, |
1873 | displaced->step_copy)); | |
1874 | } | |
1875 | ||
372316f1 PA |
1876 | /* If we displaced stepped an instruction successfully, adjust |
1877 | registers and memory to yield the same effect the instruction would | |
1878 | have had if we had executed it at its original address, and return | |
1879 | 1. If the instruction didn't complete, relocate the PC and return | |
1880 | -1. If the thread wasn't displaced stepping, return 0. */ | |
1881 | ||
1882 | static int | |
00431a78 | 1883 | displaced_step_fixup (thread_info *event_thread, enum gdb_signal signal) |
237fc4c9 | 1884 | { |
fc1cf338 | 1885 | struct displaced_step_inferior_state *displaced |
00431a78 | 1886 | = get_displaced_stepping_state (event_thread->inf); |
372316f1 | 1887 | int ret; |
fc1cf338 | 1888 | |
00431a78 PA |
1889 | /* Was this event for the thread we displaced? */ |
1890 | if (displaced->step_thread != event_thread) | |
372316f1 | 1891 | return 0; |
237fc4c9 | 1892 | |
cb71640d PA |
1893 | /* Fixup may need to read memory/registers. Switch to the thread |
1894 | that we're fixing up. Also, target_stopped_by_watchpoint checks | |
d43b7a2d TBA |
1895 | the current thread, and displaced_step_restore performs ptid-dependent |
1896 | memory accesses using current_inferior() and current_top_target(). */ | |
00431a78 | 1897 | switch_to_thread (event_thread); |
cb71640d | 1898 | |
d43b7a2d TBA |
1899 | displaced_step_reset_cleanup cleanup (displaced); |
1900 | ||
1901 | displaced_step_restore (displaced, displaced->step_thread->ptid); | |
1902 | ||
237fc4c9 | 1903 | /* Did the instruction complete successfully? */ |
cb71640d PA |
1904 | if (signal == GDB_SIGNAL_TRAP |
1905 | && !(target_stopped_by_watchpoint () | |
1906 | && (gdbarch_have_nonsteppable_watchpoint (displaced->step_gdbarch) | |
1907 | || target_have_steppable_watchpoint))) | |
237fc4c9 PA |
1908 | { |
1909 | /* Fix up the resulting state. */ | |
fc1cf338 | 1910 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
d8d83535 | 1911 | displaced->step_closure.get (), |
fc1cf338 PA |
1912 | displaced->step_original, |
1913 | displaced->step_copy, | |
00431a78 | 1914 | get_thread_regcache (displaced->step_thread)); |
372316f1 | 1915 | ret = 1; |
237fc4c9 PA |
1916 | } |
1917 | else | |
1918 | { | |
1919 | /* Since the instruction didn't complete, all we can do is | |
1920 | relocate the PC. */ | |
00431a78 | 1921 | struct regcache *regcache = get_thread_regcache (event_thread); |
515630c5 | 1922 | CORE_ADDR pc = regcache_read_pc (regcache); |
abbb1732 | 1923 | |
fc1cf338 | 1924 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1925 | regcache_write_pc (regcache, pc); |
372316f1 | 1926 | ret = -1; |
237fc4c9 PA |
1927 | } |
1928 | ||
372316f1 | 1929 | return ret; |
c2829269 | 1930 | } |
1c5cfe86 | 1931 | |
4d9d9d04 PA |
1932 | /* Data to be passed around while handling an event. This data is |
1933 | discarded between events. */ | |
1934 | struct execution_control_state | |
1935 | { | |
5b6d1e4f | 1936 | process_stratum_target *target; |
4d9d9d04 PA |
1937 | ptid_t ptid; |
1938 | /* The thread that got the event, if this was a thread event; NULL | |
1939 | otherwise. */ | |
1940 | struct thread_info *event_thread; | |
1941 | ||
1942 | struct target_waitstatus ws; | |
1943 | int stop_func_filled_in; | |
1944 | CORE_ADDR stop_func_start; | |
1945 | CORE_ADDR stop_func_end; | |
1946 | const char *stop_func_name; | |
1947 | int wait_some_more; | |
1948 | ||
1949 | /* True if the event thread hit the single-step breakpoint of | |
1950 | another thread. Thus the event doesn't cause a stop, the thread | |
1951 | needs to be single-stepped past the single-step breakpoint before | |
1952 | we can switch back to the original stepping thread. */ | |
1953 | int hit_singlestep_breakpoint; | |
1954 | }; | |
1955 | ||
1956 | /* Clear ECS and set it to point at TP. */ | |
c2829269 PA |
1957 | |
1958 | static void | |
4d9d9d04 PA |
1959 | reset_ecs (struct execution_control_state *ecs, struct thread_info *tp) |
1960 | { | |
1961 | memset (ecs, 0, sizeof (*ecs)); | |
1962 | ecs->event_thread = tp; | |
1963 | ecs->ptid = tp->ptid; | |
1964 | } | |
1965 | ||
1966 | static void keep_going_pass_signal (struct execution_control_state *ecs); | |
1967 | static void prepare_to_wait (struct execution_control_state *ecs); | |
2ac7589c | 1968 | static int keep_going_stepped_thread (struct thread_info *tp); |
8d297bbf | 1969 | static step_over_what thread_still_needs_step_over (struct thread_info *tp); |
4d9d9d04 PA |
1970 | |
1971 | /* Are there any pending step-over requests? If so, run all we can | |
1972 | now and return true. Otherwise, return false. */ | |
1973 | ||
1974 | static int | |
c2829269 PA |
1975 | start_step_over (void) |
1976 | { | |
1977 | struct thread_info *tp, *next; | |
1978 | ||
372316f1 PA |
1979 | /* Don't start a new step-over if we already have an in-line |
1980 | step-over operation ongoing. */ | |
1981 | if (step_over_info_valid_p ()) | |
1982 | return 0; | |
1983 | ||
c2829269 | 1984 | for (tp = step_over_queue_head; tp != NULL; tp = next) |
237fc4c9 | 1985 | { |
4d9d9d04 PA |
1986 | struct execution_control_state ecss; |
1987 | struct execution_control_state *ecs = &ecss; | |
8d297bbf | 1988 | step_over_what step_what; |
372316f1 | 1989 | int must_be_in_line; |
c2829269 | 1990 | |
c65d6b55 PA |
1991 | gdb_assert (!tp->stop_requested); |
1992 | ||
c2829269 | 1993 | next = thread_step_over_chain_next (tp); |
237fc4c9 | 1994 | |
c2829269 PA |
1995 | /* If this inferior already has a displaced step in process, |
1996 | don't start a new one. */ | |
00431a78 | 1997 | if (displaced_step_in_progress (tp->inf)) |
c2829269 PA |
1998 | continue; |
1999 | ||
372316f1 PA |
2000 | step_what = thread_still_needs_step_over (tp); |
2001 | must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT) | |
2002 | || ((step_what & STEP_OVER_BREAKPOINT) | |
3fc8eb30 | 2003 | && !use_displaced_stepping (tp))); |
372316f1 PA |
2004 | |
2005 | /* We currently stop all threads of all processes to step-over | |
2006 | in-line. If we need to start a new in-line step-over, let | |
2007 | any pending displaced steps finish first. */ | |
2008 | if (must_be_in_line && displaced_step_in_progress_any_inferior ()) | |
2009 | return 0; | |
2010 | ||
c2829269 PA |
2011 | thread_step_over_chain_remove (tp); |
2012 | ||
2013 | if (step_over_queue_head == NULL) | |
2014 | { | |
2015 | if (debug_infrun) | |
2016 | fprintf_unfiltered (gdb_stdlog, | |
2017 | "infrun: step-over queue now empty\n"); | |
2018 | } | |
2019 | ||
372316f1 PA |
2020 | if (tp->control.trap_expected |
2021 | || tp->resumed | |
2022 | || tp->executing) | |
ad53cd71 | 2023 | { |
4d9d9d04 PA |
2024 | internal_error (__FILE__, __LINE__, |
2025 | "[%s] has inconsistent state: " | |
372316f1 | 2026 | "trap_expected=%d, resumed=%d, executing=%d\n", |
a068643d | 2027 | target_pid_to_str (tp->ptid).c_str (), |
4d9d9d04 | 2028 | tp->control.trap_expected, |
372316f1 | 2029 | tp->resumed, |
4d9d9d04 | 2030 | tp->executing); |
ad53cd71 | 2031 | } |
1c5cfe86 | 2032 | |
4d9d9d04 PA |
2033 | if (debug_infrun) |
2034 | fprintf_unfiltered (gdb_stdlog, | |
2035 | "infrun: resuming [%s] for step-over\n", | |
a068643d | 2036 | target_pid_to_str (tp->ptid).c_str ()); |
4d9d9d04 PA |
2037 | |
2038 | /* keep_going_pass_signal skips the step-over if the breakpoint | |
2039 | is no longer inserted. In all-stop, we want to keep looking | |
2040 | for a thread that needs a step-over instead of resuming TP, | |
2041 | because we wouldn't be able to resume anything else until the | |
2042 | target stops again. In non-stop, the resume always resumes | |
2043 | only TP, so it's OK to let the thread resume freely. */ | |
fbea99ea | 2044 | if (!target_is_non_stop_p () && !step_what) |
4d9d9d04 | 2045 | continue; |
8550d3b3 | 2046 | |
00431a78 | 2047 | switch_to_thread (tp); |
4d9d9d04 PA |
2048 | reset_ecs (ecs, tp); |
2049 | keep_going_pass_signal (ecs); | |
1c5cfe86 | 2050 | |
4d9d9d04 PA |
2051 | if (!ecs->wait_some_more) |
2052 | error (_("Command aborted.")); | |
1c5cfe86 | 2053 | |
372316f1 PA |
2054 | gdb_assert (tp->resumed); |
2055 | ||
2056 | /* If we started a new in-line step-over, we're done. */ | |
2057 | if (step_over_info_valid_p ()) | |
2058 | { | |
2059 | gdb_assert (tp->control.trap_expected); | |
2060 | return 1; | |
2061 | } | |
2062 | ||
fbea99ea | 2063 | if (!target_is_non_stop_p ()) |
4d9d9d04 PA |
2064 | { |
2065 | /* On all-stop, shouldn't have resumed unless we needed a | |
2066 | step over. */ | |
2067 | gdb_assert (tp->control.trap_expected | |
2068 | || tp->step_after_step_resume_breakpoint); | |
2069 | ||
2070 | /* With remote targets (at least), in all-stop, we can't | |
2071 | issue any further remote commands until the program stops | |
2072 | again. */ | |
2073 | return 1; | |
1c5cfe86 | 2074 | } |
c2829269 | 2075 | |
4d9d9d04 PA |
2076 | /* Either the thread no longer needed a step-over, or a new |
2077 | displaced stepping sequence started. Even in the latter | |
2078 | case, continue looking. Maybe we can also start another | |
2079 | displaced step on a thread of other process. */ | |
237fc4c9 | 2080 | } |
4d9d9d04 PA |
2081 | |
2082 | return 0; | |
237fc4c9 PA |
2083 | } |
2084 | ||
5231c1fd PA |
2085 | /* Update global variables holding ptids to hold NEW_PTID if they were |
2086 | holding OLD_PTID. */ | |
2087 | static void | |
2088 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
2089 | { | |
d7e15655 | 2090 | if (inferior_ptid == old_ptid) |
5231c1fd | 2091 | inferior_ptid = new_ptid; |
5231c1fd PA |
2092 | } |
2093 | ||
237fc4c9 | 2094 | \f |
c906108c | 2095 | |
53904c9e AC |
2096 | static const char schedlock_off[] = "off"; |
2097 | static const char schedlock_on[] = "on"; | |
2098 | static const char schedlock_step[] = "step"; | |
f2665db5 | 2099 | static const char schedlock_replay[] = "replay"; |
40478521 | 2100 | static const char *const scheduler_enums[] = { |
ef346e04 AC |
2101 | schedlock_off, |
2102 | schedlock_on, | |
2103 | schedlock_step, | |
f2665db5 | 2104 | schedlock_replay, |
ef346e04 AC |
2105 | NULL |
2106 | }; | |
f2665db5 | 2107 | static const char *scheduler_mode = schedlock_replay; |
920d2a44 AC |
2108 | static void |
2109 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
2110 | struct cmd_list_element *c, const char *value) | |
2111 | { | |
3e43a32a MS |
2112 | fprintf_filtered (file, |
2113 | _("Mode for locking scheduler " | |
2114 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
2115 | value); |
2116 | } | |
c906108c SS |
2117 | |
2118 | static void | |
eb4c3f4a | 2119 | set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 2120 | { |
eefe576e AC |
2121 | if (!target_can_lock_scheduler) |
2122 | { | |
2123 | scheduler_mode = schedlock_off; | |
2124 | error (_("Target '%s' cannot support this command."), target_shortname); | |
2125 | } | |
c906108c SS |
2126 | } |
2127 | ||
d4db2f36 PA |
2128 | /* True if execution commands resume all threads of all processes by |
2129 | default; otherwise, resume only threads of the current inferior | |
2130 | process. */ | |
491144b5 | 2131 | bool sched_multi = false; |
d4db2f36 | 2132 | |
2facfe5c DD |
2133 | /* Try to setup for software single stepping over the specified location. |
2134 | Return 1 if target_resume() should use hardware single step. | |
2135 | ||
2136 | GDBARCH the current gdbarch. | |
2137 | PC the location to step over. */ | |
2138 | ||
2139 | static int | |
2140 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
2141 | { | |
2142 | int hw_step = 1; | |
2143 | ||
f02253f1 | 2144 | if (execution_direction == EXEC_FORWARD |
93f9a11f YQ |
2145 | && gdbarch_software_single_step_p (gdbarch)) |
2146 | hw_step = !insert_single_step_breakpoints (gdbarch); | |
2147 | ||
2facfe5c DD |
2148 | return hw_step; |
2149 | } | |
c906108c | 2150 | |
f3263aa4 PA |
2151 | /* See infrun.h. */ |
2152 | ||
09cee04b PA |
2153 | ptid_t |
2154 | user_visible_resume_ptid (int step) | |
2155 | { | |
f3263aa4 | 2156 | ptid_t resume_ptid; |
09cee04b | 2157 | |
09cee04b PA |
2158 | if (non_stop) |
2159 | { | |
2160 | /* With non-stop mode on, threads are always handled | |
2161 | individually. */ | |
2162 | resume_ptid = inferior_ptid; | |
2163 | } | |
2164 | else if ((scheduler_mode == schedlock_on) | |
03d46957 | 2165 | || (scheduler_mode == schedlock_step && step)) |
09cee04b | 2166 | { |
f3263aa4 PA |
2167 | /* User-settable 'scheduler' mode requires solo thread |
2168 | resume. */ | |
09cee04b PA |
2169 | resume_ptid = inferior_ptid; |
2170 | } | |
f2665db5 MM |
2171 | else if ((scheduler_mode == schedlock_replay) |
2172 | && target_record_will_replay (minus_one_ptid, execution_direction)) | |
2173 | { | |
2174 | /* User-settable 'scheduler' mode requires solo thread resume in replay | |
2175 | mode. */ | |
2176 | resume_ptid = inferior_ptid; | |
2177 | } | |
f3263aa4 PA |
2178 | else if (!sched_multi && target_supports_multi_process ()) |
2179 | { | |
2180 | /* Resume all threads of the current process (and none of other | |
2181 | processes). */ | |
e99b03dc | 2182 | resume_ptid = ptid_t (inferior_ptid.pid ()); |
f3263aa4 PA |
2183 | } |
2184 | else | |
2185 | { | |
2186 | /* Resume all threads of all processes. */ | |
2187 | resume_ptid = RESUME_ALL; | |
2188 | } | |
09cee04b PA |
2189 | |
2190 | return resume_ptid; | |
2191 | } | |
2192 | ||
5b6d1e4f PA |
2193 | /* See infrun.h. */ |
2194 | ||
2195 | process_stratum_target * | |
2196 | user_visible_resume_target (ptid_t resume_ptid) | |
2197 | { | |
2198 | return (resume_ptid == minus_one_ptid && sched_multi | |
2199 | ? NULL | |
2200 | : current_inferior ()->process_target ()); | |
2201 | } | |
2202 | ||
fbea99ea PA |
2203 | /* Return a ptid representing the set of threads that we will resume, |
2204 | in the perspective of the target, assuming run control handling | |
2205 | does not require leaving some threads stopped (e.g., stepping past | |
2206 | breakpoint). USER_STEP indicates whether we're about to start the | |
2207 | target for a stepping command. */ | |
2208 | ||
2209 | static ptid_t | |
2210 | internal_resume_ptid (int user_step) | |
2211 | { | |
2212 | /* In non-stop, we always control threads individually. Note that | |
2213 | the target may always work in non-stop mode even with "set | |
2214 | non-stop off", in which case user_visible_resume_ptid could | |
2215 | return a wildcard ptid. */ | |
2216 | if (target_is_non_stop_p ()) | |
2217 | return inferior_ptid; | |
2218 | else | |
2219 | return user_visible_resume_ptid (user_step); | |
2220 | } | |
2221 | ||
64ce06e4 PA |
2222 | /* Wrapper for target_resume, that handles infrun-specific |
2223 | bookkeeping. */ | |
2224 | ||
2225 | static void | |
2226 | do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig) | |
2227 | { | |
2228 | struct thread_info *tp = inferior_thread (); | |
2229 | ||
c65d6b55 PA |
2230 | gdb_assert (!tp->stop_requested); |
2231 | ||
64ce06e4 | 2232 | /* Install inferior's terminal modes. */ |
223ffa71 | 2233 | target_terminal::inferior (); |
64ce06e4 PA |
2234 | |
2235 | /* Avoid confusing the next resume, if the next stop/resume | |
2236 | happens to apply to another thread. */ | |
2237 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2238 | ||
8f572e5c PA |
2239 | /* Advise target which signals may be handled silently. |
2240 | ||
2241 | If we have removed breakpoints because we are stepping over one | |
2242 | in-line (in any thread), we need to receive all signals to avoid | |
2243 | accidentally skipping a breakpoint during execution of a signal | |
2244 | handler. | |
2245 | ||
2246 | Likewise if we're displaced stepping, otherwise a trap for a | |
2247 | breakpoint in a signal handler might be confused with the | |
2248 | displaced step finishing. We don't make the displaced_step_fixup | |
2249 | step distinguish the cases instead, because: | |
2250 | ||
2251 | - a backtrace while stopped in the signal handler would show the | |
2252 | scratch pad as frame older than the signal handler, instead of | |
2253 | the real mainline code. | |
2254 | ||
2255 | - when the thread is later resumed, the signal handler would | |
2256 | return to the scratch pad area, which would no longer be | |
2257 | valid. */ | |
2258 | if (step_over_info_valid_p () | |
00431a78 | 2259 | || displaced_step_in_progress (tp->inf)) |
adc6a863 | 2260 | target_pass_signals ({}); |
64ce06e4 | 2261 | else |
adc6a863 | 2262 | target_pass_signals (signal_pass); |
64ce06e4 PA |
2263 | |
2264 | target_resume (resume_ptid, step, sig); | |
85ad3aaf PA |
2265 | |
2266 | target_commit_resume (); | |
5b6d1e4f PA |
2267 | |
2268 | if (target_can_async_p ()) | |
2269 | target_async (1); | |
64ce06e4 PA |
2270 | } |
2271 | ||
d930703d | 2272 | /* Resume the inferior. SIG is the signal to give the inferior |
71d378ae PA |
2273 | (GDB_SIGNAL_0 for none). Note: don't call this directly; instead |
2274 | call 'resume', which handles exceptions. */ | |
c906108c | 2275 | |
71d378ae PA |
2276 | static void |
2277 | resume_1 (enum gdb_signal sig) | |
c906108c | 2278 | { |
515630c5 | 2279 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 2280 | struct gdbarch *gdbarch = regcache->arch (); |
4e1c45ea | 2281 | struct thread_info *tp = inferior_thread (); |
8b86c959 | 2282 | const address_space *aspace = regcache->aspace (); |
b0f16a3e | 2283 | ptid_t resume_ptid; |
856e7dd6 PA |
2284 | /* This represents the user's step vs continue request. When |
2285 | deciding whether "set scheduler-locking step" applies, it's the | |
2286 | user's intention that counts. */ | |
2287 | const int user_step = tp->control.stepping_command; | |
64ce06e4 PA |
2288 | /* This represents what we'll actually request the target to do. |
2289 | This can decay from a step to a continue, if e.g., we need to | |
2290 | implement single-stepping with breakpoints (software | |
2291 | single-step). */ | |
6b403daa | 2292 | int step; |
c7e8a53c | 2293 | |
c65d6b55 | 2294 | gdb_assert (!tp->stop_requested); |
c2829269 PA |
2295 | gdb_assert (!thread_is_in_step_over_chain (tp)); |
2296 | ||
372316f1 PA |
2297 | if (tp->suspend.waitstatus_pending_p) |
2298 | { | |
2299 | if (debug_infrun) | |
2300 | { | |
23fdd69e SM |
2301 | std::string statstr |
2302 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2303 | |
372316f1 | 2304 | fprintf_unfiltered (gdb_stdlog, |
23fdd69e SM |
2305 | "infrun: resume: thread %s has pending wait " |
2306 | "status %s (currently_stepping=%d).\n", | |
a068643d TT |
2307 | target_pid_to_str (tp->ptid).c_str (), |
2308 | statstr.c_str (), | |
372316f1 | 2309 | currently_stepping (tp)); |
372316f1 PA |
2310 | } |
2311 | ||
5b6d1e4f | 2312 | tp->inf->process_target ()->threads_executing = true; |
719546c4 | 2313 | tp->resumed = true; |
372316f1 PA |
2314 | |
2315 | /* FIXME: What should we do if we are supposed to resume this | |
2316 | thread with a signal? Maybe we should maintain a queue of | |
2317 | pending signals to deliver. */ | |
2318 | if (sig != GDB_SIGNAL_0) | |
2319 | { | |
fd7dcb94 | 2320 | warning (_("Couldn't deliver signal %s to %s."), |
a068643d TT |
2321 | gdb_signal_to_name (sig), |
2322 | target_pid_to_str (tp->ptid).c_str ()); | |
372316f1 PA |
2323 | } |
2324 | ||
2325 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
372316f1 PA |
2326 | |
2327 | if (target_can_async_p ()) | |
9516f85a AB |
2328 | { |
2329 | target_async (1); | |
2330 | /* Tell the event loop we have an event to process. */ | |
2331 | mark_async_event_handler (infrun_async_inferior_event_token); | |
2332 | } | |
372316f1 PA |
2333 | return; |
2334 | } | |
2335 | ||
2336 | tp->stepped_breakpoint = 0; | |
2337 | ||
6b403daa PA |
2338 | /* Depends on stepped_breakpoint. */ |
2339 | step = currently_stepping (tp); | |
2340 | ||
74609e71 YQ |
2341 | if (current_inferior ()->waiting_for_vfork_done) |
2342 | { | |
48f9886d PA |
2343 | /* Don't try to single-step a vfork parent that is waiting for |
2344 | the child to get out of the shared memory region (by exec'ing | |
2345 | or exiting). This is particularly important on software | |
2346 | single-step archs, as the child process would trip on the | |
2347 | software single step breakpoint inserted for the parent | |
2348 | process. Since the parent will not actually execute any | |
2349 | instruction until the child is out of the shared region (such | |
2350 | are vfork's semantics), it is safe to simply continue it. | |
2351 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
2352 | the parent, and tell it to `keep_going', which automatically | |
2353 | re-sets it stepping. */ | |
74609e71 YQ |
2354 | if (debug_infrun) |
2355 | fprintf_unfiltered (gdb_stdlog, | |
2356 | "infrun: resume : clear step\n"); | |
a09dd441 | 2357 | step = 0; |
74609e71 YQ |
2358 | } |
2359 | ||
7ca9b62a TBA |
2360 | CORE_ADDR pc = regcache_read_pc (regcache); |
2361 | ||
527159b7 | 2362 | if (debug_infrun) |
237fc4c9 | 2363 | fprintf_unfiltered (gdb_stdlog, |
c9737c08 | 2364 | "infrun: resume (step=%d, signal=%s), " |
0d9a9a5f | 2365 | "trap_expected=%d, current thread [%s] at %s\n", |
c9737c08 PA |
2366 | step, gdb_signal_to_symbol_string (sig), |
2367 | tp->control.trap_expected, | |
a068643d | 2368 | target_pid_to_str (inferior_ptid).c_str (), |
0d9a9a5f | 2369 | paddress (gdbarch, pc)); |
c906108c | 2370 | |
c2c6d25f JM |
2371 | /* Normally, by the time we reach `resume', the breakpoints are either |
2372 | removed or inserted, as appropriate. The exception is if we're sitting | |
2373 | at a permanent breakpoint; we need to step over it, but permanent | |
2374 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 2375 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 2376 | { |
af48d08f PA |
2377 | if (sig != GDB_SIGNAL_0) |
2378 | { | |
2379 | /* We have a signal to pass to the inferior. The resume | |
2380 | may, or may not take us to the signal handler. If this | |
2381 | is a step, we'll need to stop in the signal handler, if | |
2382 | there's one, (if the target supports stepping into | |
2383 | handlers), or in the next mainline instruction, if | |
2384 | there's no handler. If this is a continue, we need to be | |
2385 | sure to run the handler with all breakpoints inserted. | |
2386 | In all cases, set a breakpoint at the current address | |
2387 | (where the handler returns to), and once that breakpoint | |
2388 | is hit, resume skipping the permanent breakpoint. If | |
2389 | that breakpoint isn't hit, then we've stepped into the | |
2390 | signal handler (or hit some other event). We'll delete | |
2391 | the step-resume breakpoint then. */ | |
2392 | ||
2393 | if (debug_infrun) | |
2394 | fprintf_unfiltered (gdb_stdlog, | |
2395 | "infrun: resume: skipping permanent breakpoint, " | |
2396 | "deliver signal first\n"); | |
2397 | ||
2398 | clear_step_over_info (); | |
2399 | tp->control.trap_expected = 0; | |
2400 | ||
2401 | if (tp->control.step_resume_breakpoint == NULL) | |
2402 | { | |
2403 | /* Set a "high-priority" step-resume, as we don't want | |
2404 | user breakpoints at PC to trigger (again) when this | |
2405 | hits. */ | |
2406 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); | |
2407 | gdb_assert (tp->control.step_resume_breakpoint->loc->permanent); | |
2408 | ||
2409 | tp->step_after_step_resume_breakpoint = step; | |
2410 | } | |
2411 | ||
2412 | insert_breakpoints (); | |
2413 | } | |
2414 | else | |
2415 | { | |
2416 | /* There's no signal to pass, we can go ahead and skip the | |
2417 | permanent breakpoint manually. */ | |
2418 | if (debug_infrun) | |
2419 | fprintf_unfiltered (gdb_stdlog, | |
2420 | "infrun: resume: skipping permanent breakpoint\n"); | |
2421 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
2422 | /* Update pc to reflect the new address from which we will | |
2423 | execute instructions. */ | |
2424 | pc = regcache_read_pc (regcache); | |
2425 | ||
2426 | if (step) | |
2427 | { | |
2428 | /* We've already advanced the PC, so the stepping part | |
2429 | is done. Now we need to arrange for a trap to be | |
2430 | reported to handle_inferior_event. Set a breakpoint | |
2431 | at the current PC, and run to it. Don't update | |
2432 | prev_pc, because if we end in | |
44a1ee51 PA |
2433 | switch_back_to_stepped_thread, we want the "expected |
2434 | thread advanced also" branch to be taken. IOW, we | |
2435 | don't want this thread to step further from PC | |
af48d08f | 2436 | (overstep). */ |
1ac806b8 | 2437 | gdb_assert (!step_over_info_valid_p ()); |
af48d08f PA |
2438 | insert_single_step_breakpoint (gdbarch, aspace, pc); |
2439 | insert_breakpoints (); | |
2440 | ||
fbea99ea | 2441 | resume_ptid = internal_resume_ptid (user_step); |
1ac806b8 | 2442 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
719546c4 | 2443 | tp->resumed = true; |
af48d08f PA |
2444 | return; |
2445 | } | |
2446 | } | |
6d350bb5 | 2447 | } |
c2c6d25f | 2448 | |
c1e36e3e PA |
2449 | /* If we have a breakpoint to step over, make sure to do a single |
2450 | step only. Same if we have software watchpoints. */ | |
2451 | if (tp->control.trap_expected || bpstat_should_step ()) | |
2452 | tp->control.may_range_step = 0; | |
2453 | ||
7da6a5b9 LM |
2454 | /* If displaced stepping is enabled, step over breakpoints by executing a |
2455 | copy of the instruction at a different address. | |
237fc4c9 PA |
2456 | |
2457 | We can't use displaced stepping when we have a signal to deliver; | |
2458 | the comments for displaced_step_prepare explain why. The | |
2459 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
2460 | signals' explain what we do instead. |
2461 | ||
2462 | We can't use displaced stepping when we are waiting for vfork_done | |
2463 | event, displaced stepping breaks the vfork child similarly as single | |
2464 | step software breakpoint. */ | |
3fc8eb30 PA |
2465 | if (tp->control.trap_expected |
2466 | && use_displaced_stepping (tp) | |
cb71640d | 2467 | && !step_over_info_valid_p () |
a493e3e2 | 2468 | && sig == GDB_SIGNAL_0 |
74609e71 | 2469 | && !current_inferior ()->waiting_for_vfork_done) |
237fc4c9 | 2470 | { |
00431a78 | 2471 | int prepared = displaced_step_prepare (tp); |
fc1cf338 | 2472 | |
3fc8eb30 | 2473 | if (prepared == 0) |
d56b7306 | 2474 | { |
4d9d9d04 PA |
2475 | if (debug_infrun) |
2476 | fprintf_unfiltered (gdb_stdlog, | |
2477 | "Got placed in step-over queue\n"); | |
2478 | ||
2479 | tp->control.trap_expected = 0; | |
d56b7306 VP |
2480 | return; |
2481 | } | |
3fc8eb30 PA |
2482 | else if (prepared < 0) |
2483 | { | |
2484 | /* Fallback to stepping over the breakpoint in-line. */ | |
2485 | ||
2486 | if (target_is_non_stop_p ()) | |
2487 | stop_all_threads (); | |
2488 | ||
a01bda52 | 2489 | set_step_over_info (regcache->aspace (), |
21edc42f | 2490 | regcache_read_pc (regcache), 0, tp->global_num); |
3fc8eb30 PA |
2491 | |
2492 | step = maybe_software_singlestep (gdbarch, pc); | |
2493 | ||
2494 | insert_breakpoints (); | |
2495 | } | |
2496 | else if (prepared > 0) | |
2497 | { | |
2498 | struct displaced_step_inferior_state *displaced; | |
99e40580 | 2499 | |
3fc8eb30 PA |
2500 | /* Update pc to reflect the new address from which we will |
2501 | execute instructions due to displaced stepping. */ | |
00431a78 | 2502 | pc = regcache_read_pc (get_thread_regcache (tp)); |
ca7781d2 | 2503 | |
00431a78 | 2504 | displaced = get_displaced_stepping_state (tp->inf); |
d8d83535 SM |
2505 | step = gdbarch_displaced_step_hw_singlestep |
2506 | (gdbarch, displaced->step_closure.get ()); | |
3fc8eb30 | 2507 | } |
237fc4c9 PA |
2508 | } |
2509 | ||
2facfe5c | 2510 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 2511 | else if (step) |
2facfe5c | 2512 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 2513 | |
30852783 UW |
2514 | /* Currently, our software single-step implementation leads to different |
2515 | results than hardware single-stepping in one situation: when stepping | |
2516 | into delivering a signal which has an associated signal handler, | |
2517 | hardware single-step will stop at the first instruction of the handler, | |
2518 | while software single-step will simply skip execution of the handler. | |
2519 | ||
2520 | For now, this difference in behavior is accepted since there is no | |
2521 | easy way to actually implement single-stepping into a signal handler | |
2522 | without kernel support. | |
2523 | ||
2524 | However, there is one scenario where this difference leads to follow-on | |
2525 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
2526 | and then single-stepping. In this case, the software single-step | |
2527 | behavior means that even if there is a *breakpoint* in the signal | |
2528 | handler, GDB still would not stop. | |
2529 | ||
2530 | Fortunately, we can at least fix this particular issue. We detect | |
2531 | here the case where we are about to deliver a signal while software | |
2532 | single-stepping with breakpoints removed. In this situation, we | |
2533 | revert the decisions to remove all breakpoints and insert single- | |
2534 | step breakpoints, and instead we install a step-resume breakpoint | |
2535 | at the current address, deliver the signal without stepping, and | |
2536 | once we arrive back at the step-resume breakpoint, actually step | |
2537 | over the breakpoint we originally wanted to step over. */ | |
34b7e8a6 | 2538 | if (thread_has_single_step_breakpoints_set (tp) |
6cc83d2a PA |
2539 | && sig != GDB_SIGNAL_0 |
2540 | && step_over_info_valid_p ()) | |
30852783 UW |
2541 | { |
2542 | /* If we have nested signals or a pending signal is delivered | |
7da6a5b9 | 2543 | immediately after a handler returns, might already have |
30852783 UW |
2544 | a step-resume breakpoint set on the earlier handler. We cannot |
2545 | set another step-resume breakpoint; just continue on until the | |
2546 | original breakpoint is hit. */ | |
2547 | if (tp->control.step_resume_breakpoint == NULL) | |
2548 | { | |
2c03e5be | 2549 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
2550 | tp->step_after_step_resume_breakpoint = 1; |
2551 | } | |
2552 | ||
34b7e8a6 | 2553 | delete_single_step_breakpoints (tp); |
30852783 | 2554 | |
31e77af2 | 2555 | clear_step_over_info (); |
30852783 | 2556 | tp->control.trap_expected = 0; |
31e77af2 PA |
2557 | |
2558 | insert_breakpoints (); | |
30852783 UW |
2559 | } |
2560 | ||
b0f16a3e SM |
2561 | /* If STEP is set, it's a request to use hardware stepping |
2562 | facilities. But in that case, we should never | |
2563 | use singlestep breakpoint. */ | |
34b7e8a6 | 2564 | gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step)); |
dfcd3bfb | 2565 | |
fbea99ea | 2566 | /* Decide the set of threads to ask the target to resume. */ |
1946c4cc | 2567 | if (tp->control.trap_expected) |
b0f16a3e SM |
2568 | { |
2569 | /* We're allowing a thread to run past a breakpoint it has | |
1946c4cc YQ |
2570 | hit, either by single-stepping the thread with the breakpoint |
2571 | removed, or by displaced stepping, with the breakpoint inserted. | |
2572 | In the former case, we need to single-step only this thread, | |
2573 | and keep others stopped, as they can miss this breakpoint if | |
2574 | allowed to run. That's not really a problem for displaced | |
2575 | stepping, but, we still keep other threads stopped, in case | |
2576 | another thread is also stopped for a breakpoint waiting for | |
2577 | its turn in the displaced stepping queue. */ | |
b0f16a3e SM |
2578 | resume_ptid = inferior_ptid; |
2579 | } | |
fbea99ea PA |
2580 | else |
2581 | resume_ptid = internal_resume_ptid (user_step); | |
d4db2f36 | 2582 | |
7f5ef605 PA |
2583 | if (execution_direction != EXEC_REVERSE |
2584 | && step && breakpoint_inserted_here_p (aspace, pc)) | |
b0f16a3e | 2585 | { |
372316f1 PA |
2586 | /* There are two cases where we currently need to step a |
2587 | breakpoint instruction when we have a signal to deliver: | |
2588 | ||
2589 | - See handle_signal_stop where we handle random signals that | |
2590 | could take out us out of the stepping range. Normally, in | |
2591 | that case we end up continuing (instead of stepping) over the | |
7f5ef605 PA |
2592 | signal handler with a breakpoint at PC, but there are cases |
2593 | where we should _always_ single-step, even if we have a | |
2594 | step-resume breakpoint, like when a software watchpoint is | |
2595 | set. Assuming single-stepping and delivering a signal at the | |
2596 | same time would takes us to the signal handler, then we could | |
2597 | have removed the breakpoint at PC to step over it. However, | |
2598 | some hardware step targets (like e.g., Mac OS) can't step | |
2599 | into signal handlers, and for those, we need to leave the | |
2600 | breakpoint at PC inserted, as otherwise if the handler | |
2601 | recurses and executes PC again, it'll miss the breakpoint. | |
2602 | So we leave the breakpoint inserted anyway, but we need to | |
2603 | record that we tried to step a breakpoint instruction, so | |
372316f1 PA |
2604 | that adjust_pc_after_break doesn't end up confused. |
2605 | ||
2606 | - In non-stop if we insert a breakpoint (e.g., a step-resume) | |
2607 | in one thread after another thread that was stepping had been | |
2608 | momentarily paused for a step-over. When we re-resume the | |
2609 | stepping thread, it may be resumed from that address with a | |
2610 | breakpoint that hasn't trapped yet. Seen with | |
2611 | gdb.threads/non-stop-fair-events.exp, on targets that don't | |
2612 | do displaced stepping. */ | |
2613 | ||
2614 | if (debug_infrun) | |
2615 | fprintf_unfiltered (gdb_stdlog, | |
2616 | "infrun: resume: [%s] stepped breakpoint\n", | |
a068643d | 2617 | target_pid_to_str (tp->ptid).c_str ()); |
7f5ef605 PA |
2618 | |
2619 | tp->stepped_breakpoint = 1; | |
2620 | ||
b0f16a3e SM |
2621 | /* Most targets can step a breakpoint instruction, thus |
2622 | executing it normally. But if this one cannot, just | |
2623 | continue and we will hit it anyway. */ | |
7f5ef605 | 2624 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
b0f16a3e SM |
2625 | step = 0; |
2626 | } | |
ef5cf84e | 2627 | |
b0f16a3e | 2628 | if (debug_displaced |
cb71640d | 2629 | && tp->control.trap_expected |
3fc8eb30 | 2630 | && use_displaced_stepping (tp) |
cb71640d | 2631 | && !step_over_info_valid_p ()) |
b0f16a3e | 2632 | { |
00431a78 | 2633 | struct regcache *resume_regcache = get_thread_regcache (tp); |
ac7936df | 2634 | struct gdbarch *resume_gdbarch = resume_regcache->arch (); |
b0f16a3e SM |
2635 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
2636 | gdb_byte buf[4]; | |
2637 | ||
2638 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", | |
2639 | paddress (resume_gdbarch, actual_pc)); | |
2640 | read_memory (actual_pc, buf, sizeof (buf)); | |
2641 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
2642 | } | |
237fc4c9 | 2643 | |
b0f16a3e SM |
2644 | if (tp->control.may_range_step) |
2645 | { | |
2646 | /* If we're resuming a thread with the PC out of the step | |
2647 | range, then we're doing some nested/finer run control | |
2648 | operation, like stepping the thread out of the dynamic | |
2649 | linker or the displaced stepping scratch pad. We | |
2650 | shouldn't have allowed a range step then. */ | |
2651 | gdb_assert (pc_in_thread_step_range (pc, tp)); | |
2652 | } | |
c1e36e3e | 2653 | |
64ce06e4 | 2654 | do_target_resume (resume_ptid, step, sig); |
719546c4 | 2655 | tp->resumed = true; |
c906108c | 2656 | } |
71d378ae PA |
2657 | |
2658 | /* Resume the inferior. SIG is the signal to give the inferior | |
2659 | (GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that | |
2660 | rolls back state on error. */ | |
2661 | ||
aff4e175 | 2662 | static void |
71d378ae PA |
2663 | resume (gdb_signal sig) |
2664 | { | |
a70b8144 | 2665 | try |
71d378ae PA |
2666 | { |
2667 | resume_1 (sig); | |
2668 | } | |
230d2906 | 2669 | catch (const gdb_exception &ex) |
71d378ae PA |
2670 | { |
2671 | /* If resuming is being aborted for any reason, delete any | |
2672 | single-step breakpoint resume_1 may have created, to avoid | |
2673 | confusing the following resumption, and to avoid leaving | |
2674 | single-step breakpoints perturbing other threads, in case | |
2675 | we're running in non-stop mode. */ | |
2676 | if (inferior_ptid != null_ptid) | |
2677 | delete_single_step_breakpoints (inferior_thread ()); | |
eedc3f4f | 2678 | throw; |
71d378ae | 2679 | } |
71d378ae PA |
2680 | } |
2681 | ||
c906108c | 2682 | \f |
237fc4c9 | 2683 | /* Proceeding. */ |
c906108c | 2684 | |
4c2f2a79 PA |
2685 | /* See infrun.h. */ |
2686 | ||
2687 | /* Counter that tracks number of user visible stops. This can be used | |
2688 | to tell whether a command has proceeded the inferior past the | |
2689 | current location. This allows e.g., inferior function calls in | |
2690 | breakpoint commands to not interrupt the command list. When the | |
2691 | call finishes successfully, the inferior is standing at the same | |
2692 | breakpoint as if nothing happened (and so we don't call | |
2693 | normal_stop). */ | |
2694 | static ULONGEST current_stop_id; | |
2695 | ||
2696 | /* See infrun.h. */ | |
2697 | ||
2698 | ULONGEST | |
2699 | get_stop_id (void) | |
2700 | { | |
2701 | return current_stop_id; | |
2702 | } | |
2703 | ||
2704 | /* Called when we report a user visible stop. */ | |
2705 | ||
2706 | static void | |
2707 | new_stop_id (void) | |
2708 | { | |
2709 | current_stop_id++; | |
2710 | } | |
2711 | ||
c906108c SS |
2712 | /* Clear out all variables saying what to do when inferior is continued. |
2713 | First do this, then set the ones you want, then call `proceed'. */ | |
2714 | ||
a7212384 UW |
2715 | static void |
2716 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 2717 | { |
a7212384 UW |
2718 | if (debug_infrun) |
2719 | fprintf_unfiltered (gdb_stdlog, | |
2720 | "infrun: clear_proceed_status_thread (%s)\n", | |
a068643d | 2721 | target_pid_to_str (tp->ptid).c_str ()); |
d6b48e9c | 2722 | |
372316f1 PA |
2723 | /* If we're starting a new sequence, then the previous finished |
2724 | single-step is no longer relevant. */ | |
2725 | if (tp->suspend.waitstatus_pending_p) | |
2726 | { | |
2727 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SINGLE_STEP) | |
2728 | { | |
2729 | if (debug_infrun) | |
2730 | fprintf_unfiltered (gdb_stdlog, | |
2731 | "infrun: clear_proceed_status: pending " | |
2732 | "event of %s was a finished step. " | |
2733 | "Discarding.\n", | |
a068643d | 2734 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
2735 | |
2736 | tp->suspend.waitstatus_pending_p = 0; | |
2737 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
2738 | } | |
2739 | else if (debug_infrun) | |
2740 | { | |
23fdd69e SM |
2741 | std::string statstr |
2742 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 2743 | |
372316f1 PA |
2744 | fprintf_unfiltered (gdb_stdlog, |
2745 | "infrun: clear_proceed_status_thread: thread %s " | |
2746 | "has pending wait status %s " | |
2747 | "(currently_stepping=%d).\n", | |
a068643d TT |
2748 | target_pid_to_str (tp->ptid).c_str (), |
2749 | statstr.c_str (), | |
372316f1 | 2750 | currently_stepping (tp)); |
372316f1 PA |
2751 | } |
2752 | } | |
2753 | ||
70509625 PA |
2754 | /* If this signal should not be seen by program, give it zero. |
2755 | Used for debugging signals. */ | |
2756 | if (!signal_pass_state (tp->suspend.stop_signal)) | |
2757 | tp->suspend.stop_signal = GDB_SIGNAL_0; | |
2758 | ||
46e3ed7f | 2759 | delete tp->thread_fsm; |
243a9253 PA |
2760 | tp->thread_fsm = NULL; |
2761 | ||
16c381f0 JK |
2762 | tp->control.trap_expected = 0; |
2763 | tp->control.step_range_start = 0; | |
2764 | tp->control.step_range_end = 0; | |
c1e36e3e | 2765 | tp->control.may_range_step = 0; |
16c381f0 JK |
2766 | tp->control.step_frame_id = null_frame_id; |
2767 | tp->control.step_stack_frame_id = null_frame_id; | |
2768 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
885eeb5b | 2769 | tp->control.step_start_function = NULL; |
a7212384 | 2770 | tp->stop_requested = 0; |
4e1c45ea | 2771 | |
16c381f0 | 2772 | tp->control.stop_step = 0; |
32400beb | 2773 | |
16c381f0 | 2774 | tp->control.proceed_to_finish = 0; |
414c69f7 | 2775 | |
856e7dd6 | 2776 | tp->control.stepping_command = 0; |
17b2616c | 2777 | |
a7212384 | 2778 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 2779 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 2780 | } |
32400beb | 2781 | |
a7212384 | 2782 | void |
70509625 | 2783 | clear_proceed_status (int step) |
a7212384 | 2784 | { |
f2665db5 MM |
2785 | /* With scheduler-locking replay, stop replaying other threads if we're |
2786 | not replaying the user-visible resume ptid. | |
2787 | ||
2788 | This is a convenience feature to not require the user to explicitly | |
2789 | stop replaying the other threads. We're assuming that the user's | |
2790 | intent is to resume tracing the recorded process. */ | |
2791 | if (!non_stop && scheduler_mode == schedlock_replay | |
2792 | && target_record_is_replaying (minus_one_ptid) | |
2793 | && !target_record_will_replay (user_visible_resume_ptid (step), | |
2794 | execution_direction)) | |
2795 | target_record_stop_replaying (); | |
2796 | ||
08036331 | 2797 | if (!non_stop && inferior_ptid != null_ptid) |
6c95b8df | 2798 | { |
08036331 | 2799 | ptid_t resume_ptid = user_visible_resume_ptid (step); |
5b6d1e4f PA |
2800 | process_stratum_target *resume_target |
2801 | = user_visible_resume_target (resume_ptid); | |
70509625 PA |
2802 | |
2803 | /* In all-stop mode, delete the per-thread status of all threads | |
2804 | we're about to resume, implicitly and explicitly. */ | |
5b6d1e4f | 2805 | for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid)) |
08036331 | 2806 | clear_proceed_status_thread (tp); |
6c95b8df PA |
2807 | } |
2808 | ||
d7e15655 | 2809 | if (inferior_ptid != null_ptid) |
a7212384 UW |
2810 | { |
2811 | struct inferior *inferior; | |
2812 | ||
2813 | if (non_stop) | |
2814 | { | |
6c95b8df PA |
2815 | /* If in non-stop mode, only delete the per-thread status of |
2816 | the current thread. */ | |
a7212384 UW |
2817 | clear_proceed_status_thread (inferior_thread ()); |
2818 | } | |
6c95b8df | 2819 | |
d6b48e9c | 2820 | inferior = current_inferior (); |
16c381f0 | 2821 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
2822 | } |
2823 | ||
76727919 | 2824 | gdb::observers::about_to_proceed.notify (); |
c906108c SS |
2825 | } |
2826 | ||
99619bea PA |
2827 | /* Returns true if TP is still stopped at a breakpoint that needs |
2828 | stepping-over in order to make progress. If the breakpoint is gone | |
2829 | meanwhile, we can skip the whole step-over dance. */ | |
ea67f13b DJ |
2830 | |
2831 | static int | |
6c4cfb24 | 2832 | thread_still_needs_step_over_bp (struct thread_info *tp) |
99619bea PA |
2833 | { |
2834 | if (tp->stepping_over_breakpoint) | |
2835 | { | |
00431a78 | 2836 | struct regcache *regcache = get_thread_regcache (tp); |
99619bea | 2837 | |
a01bda52 | 2838 | if (breakpoint_here_p (regcache->aspace (), |
af48d08f PA |
2839 | regcache_read_pc (regcache)) |
2840 | == ordinary_breakpoint_here) | |
99619bea PA |
2841 | return 1; |
2842 | ||
2843 | tp->stepping_over_breakpoint = 0; | |
2844 | } | |
2845 | ||
2846 | return 0; | |
2847 | } | |
2848 | ||
6c4cfb24 PA |
2849 | /* Check whether thread TP still needs to start a step-over in order |
2850 | to make progress when resumed. Returns an bitwise or of enum | |
2851 | step_over_what bits, indicating what needs to be stepped over. */ | |
2852 | ||
8d297bbf | 2853 | static step_over_what |
6c4cfb24 PA |
2854 | thread_still_needs_step_over (struct thread_info *tp) |
2855 | { | |
8d297bbf | 2856 | step_over_what what = 0; |
6c4cfb24 PA |
2857 | |
2858 | if (thread_still_needs_step_over_bp (tp)) | |
2859 | what |= STEP_OVER_BREAKPOINT; | |
2860 | ||
2861 | if (tp->stepping_over_watchpoint | |
2862 | && !target_have_steppable_watchpoint) | |
2863 | what |= STEP_OVER_WATCHPOINT; | |
2864 | ||
2865 | return what; | |
2866 | } | |
2867 | ||
483805cf PA |
2868 | /* Returns true if scheduler locking applies. STEP indicates whether |
2869 | we're about to do a step/next-like command to a thread. */ | |
2870 | ||
2871 | static int | |
856e7dd6 | 2872 | schedlock_applies (struct thread_info *tp) |
483805cf PA |
2873 | { |
2874 | return (scheduler_mode == schedlock_on | |
2875 | || (scheduler_mode == schedlock_step | |
f2665db5 MM |
2876 | && tp->control.stepping_command) |
2877 | || (scheduler_mode == schedlock_replay | |
2878 | && target_record_will_replay (minus_one_ptid, | |
2879 | execution_direction))); | |
483805cf PA |
2880 | } |
2881 | ||
5b6d1e4f PA |
2882 | /* Calls target_commit_resume on all targets. */ |
2883 | ||
2884 | static void | |
2885 | commit_resume_all_targets () | |
2886 | { | |
2887 | scoped_restore_current_thread restore_thread; | |
2888 | ||
2889 | /* Map between process_target and a representative inferior. This | |
2890 | is to avoid committing a resume in the same target more than | |
2891 | once. Resumptions must be idempotent, so this is an | |
2892 | optimization. */ | |
2893 | std::unordered_map<process_stratum_target *, inferior *> conn_inf; | |
2894 | ||
2895 | for (inferior *inf : all_non_exited_inferiors ()) | |
2896 | if (inf->has_execution ()) | |
2897 | conn_inf[inf->process_target ()] = inf; | |
2898 | ||
2899 | for (const auto &ci : conn_inf) | |
2900 | { | |
2901 | inferior *inf = ci.second; | |
2902 | switch_to_inferior_no_thread (inf); | |
2903 | target_commit_resume (); | |
2904 | } | |
2905 | } | |
2906 | ||
2f4fcf00 PA |
2907 | /* Check that all the targets we're about to resume are in non-stop |
2908 | mode. Ideally, we'd only care whether all targets support | |
2909 | target-async, but we're not there yet. E.g., stop_all_threads | |
2910 | doesn't know how to handle all-stop targets. Also, the remote | |
2911 | protocol in all-stop mode is synchronous, irrespective of | |
2912 | target-async, which means that things like a breakpoint re-set | |
2913 | triggered by one target would try to read memory from all targets | |
2914 | and fail. */ | |
2915 | ||
2916 | static void | |
2917 | check_multi_target_resumption (process_stratum_target *resume_target) | |
2918 | { | |
2919 | if (!non_stop && resume_target == nullptr) | |
2920 | { | |
2921 | scoped_restore_current_thread restore_thread; | |
2922 | ||
2923 | /* This is used to track whether we're resuming more than one | |
2924 | target. */ | |
2925 | process_stratum_target *first_connection = nullptr; | |
2926 | ||
2927 | /* The first inferior we see with a target that does not work in | |
2928 | always-non-stop mode. */ | |
2929 | inferior *first_not_non_stop = nullptr; | |
2930 | ||
2931 | for (inferior *inf : all_non_exited_inferiors (resume_target)) | |
2932 | { | |
2933 | switch_to_inferior_no_thread (inf); | |
2934 | ||
2935 | if (!target_has_execution) | |
2936 | continue; | |
2937 | ||
2938 | process_stratum_target *proc_target | |
2939 | = current_inferior ()->process_target(); | |
2940 | ||
2941 | if (!target_is_non_stop_p ()) | |
2942 | first_not_non_stop = inf; | |
2943 | ||
2944 | if (first_connection == nullptr) | |
2945 | first_connection = proc_target; | |
2946 | else if (first_connection != proc_target | |
2947 | && first_not_non_stop != nullptr) | |
2948 | { | |
2949 | switch_to_inferior_no_thread (first_not_non_stop); | |
2950 | ||
2951 | proc_target = current_inferior ()->process_target(); | |
2952 | ||
2953 | error (_("Connection %d (%s) does not support " | |
2954 | "multi-target resumption."), | |
2955 | proc_target->connection_number, | |
2956 | make_target_connection_string (proc_target).c_str ()); | |
2957 | } | |
2958 | } | |
2959 | } | |
2960 | } | |
2961 | ||
c906108c SS |
2962 | /* Basic routine for continuing the program in various fashions. |
2963 | ||
2964 | ADDR is the address to resume at, or -1 for resume where stopped. | |
aff4e175 AB |
2965 | SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none, |
2966 | or GDB_SIGNAL_DEFAULT for act according to how it stopped. | |
c906108c SS |
2967 | |
2968 | You should call clear_proceed_status before calling proceed. */ | |
2969 | ||
2970 | void | |
64ce06e4 | 2971 | proceed (CORE_ADDR addr, enum gdb_signal siggnal) |
c906108c | 2972 | { |
e58b0e63 PA |
2973 | struct regcache *regcache; |
2974 | struct gdbarch *gdbarch; | |
e58b0e63 | 2975 | CORE_ADDR pc; |
4d9d9d04 PA |
2976 | struct execution_control_state ecss; |
2977 | struct execution_control_state *ecs = &ecss; | |
4d9d9d04 | 2978 | int started; |
c906108c | 2979 | |
e58b0e63 PA |
2980 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2981 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2982 | resuming the current thread. */ | |
2983 | if (!follow_fork ()) | |
2984 | { | |
2985 | /* The target for some reason decided not to resume. */ | |
2986 | normal_stop (); | |
f148b27e PA |
2987 | if (target_can_async_p ()) |
2988 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2989 | return; |
2990 | } | |
2991 | ||
842951eb PA |
2992 | /* We'll update this if & when we switch to a new thread. */ |
2993 | previous_inferior_ptid = inferior_ptid; | |
2994 | ||
e58b0e63 | 2995 | regcache = get_current_regcache (); |
ac7936df | 2996 | gdbarch = regcache->arch (); |
8b86c959 YQ |
2997 | const address_space *aspace = regcache->aspace (); |
2998 | ||
fc75c28b TBA |
2999 | pc = regcache_read_pc_protected (regcache); |
3000 | ||
08036331 | 3001 | thread_info *cur_thr = inferior_thread (); |
e58b0e63 | 3002 | |
99619bea | 3003 | /* Fill in with reasonable starting values. */ |
08036331 | 3004 | init_thread_stepping_state (cur_thr); |
99619bea | 3005 | |
08036331 | 3006 | gdb_assert (!thread_is_in_step_over_chain (cur_thr)); |
c2829269 | 3007 | |
5b6d1e4f PA |
3008 | ptid_t resume_ptid |
3009 | = user_visible_resume_ptid (cur_thr->control.stepping_command); | |
3010 | process_stratum_target *resume_target | |
3011 | = user_visible_resume_target (resume_ptid); | |
3012 | ||
2f4fcf00 PA |
3013 | check_multi_target_resumption (resume_target); |
3014 | ||
2acceee2 | 3015 | if (addr == (CORE_ADDR) -1) |
c906108c | 3016 | { |
08036331 | 3017 | if (pc == cur_thr->suspend.stop_pc |
af48d08f | 3018 | && breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here |
b2175913 | 3019 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
3020 | /* There is a breakpoint at the address we will resume at, |
3021 | step one instruction before inserting breakpoints so that | |
3022 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
3023 | breakpoint). |
3024 | ||
3025 | Note, we don't do this in reverse, because we won't | |
3026 | actually be executing the breakpoint insn anyway. | |
3027 | We'll be (un-)executing the previous instruction. */ | |
08036331 | 3028 | cur_thr->stepping_over_breakpoint = 1; |
515630c5 UW |
3029 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
3030 | && gdbarch_single_step_through_delay (gdbarch, | |
3031 | get_current_frame ())) | |
3352ef37 AC |
3032 | /* We stepped onto an instruction that needs to be stepped |
3033 | again before re-inserting the breakpoint, do so. */ | |
08036331 | 3034 | cur_thr->stepping_over_breakpoint = 1; |
c906108c SS |
3035 | } |
3036 | else | |
3037 | { | |
515630c5 | 3038 | regcache_write_pc (regcache, addr); |
c906108c SS |
3039 | } |
3040 | ||
70509625 | 3041 | if (siggnal != GDB_SIGNAL_DEFAULT) |
08036331 | 3042 | cur_thr->suspend.stop_signal = siggnal; |
70509625 | 3043 | |
4d9d9d04 PA |
3044 | /* If an exception is thrown from this point on, make sure to |
3045 | propagate GDB's knowledge of the executing state to the | |
3046 | frontend/user running state. */ | |
5b6d1e4f | 3047 | scoped_finish_thread_state finish_state (resume_target, resume_ptid); |
4d9d9d04 PA |
3048 | |
3049 | /* Even if RESUME_PTID is a wildcard, and we end up resuming fewer | |
3050 | threads (e.g., we might need to set threads stepping over | |
3051 | breakpoints first), from the user/frontend's point of view, all | |
3052 | threads in RESUME_PTID are now running. Unless we're calling an | |
3053 | inferior function, as in that case we pretend the inferior | |
3054 | doesn't run at all. */ | |
08036331 | 3055 | if (!cur_thr->control.in_infcall) |
719546c4 | 3056 | set_running (resume_target, resume_ptid, true); |
17b2616c | 3057 | |
527159b7 | 3058 | if (debug_infrun) |
8a9de0e4 | 3059 | fprintf_unfiltered (gdb_stdlog, |
64ce06e4 | 3060 | "infrun: proceed (addr=%s, signal=%s)\n", |
c9737c08 | 3061 | paddress (gdbarch, addr), |
64ce06e4 | 3062 | gdb_signal_to_symbol_string (siggnal)); |
527159b7 | 3063 | |
4d9d9d04 PA |
3064 | annotate_starting (); |
3065 | ||
3066 | /* Make sure that output from GDB appears before output from the | |
3067 | inferior. */ | |
3068 | gdb_flush (gdb_stdout); | |
3069 | ||
d930703d PA |
3070 | /* Since we've marked the inferior running, give it the terminal. A |
3071 | QUIT/Ctrl-C from here on is forwarded to the target (which can | |
3072 | still detect attempts to unblock a stuck connection with repeated | |
3073 | Ctrl-C from within target_pass_ctrlc). */ | |
3074 | target_terminal::inferior (); | |
3075 | ||
4d9d9d04 PA |
3076 | /* In a multi-threaded task we may select another thread and |
3077 | then continue or step. | |
3078 | ||
3079 | But if a thread that we're resuming had stopped at a breakpoint, | |
3080 | it will immediately cause another breakpoint stop without any | |
3081 | execution (i.e. it will report a breakpoint hit incorrectly). So | |
3082 | we must step over it first. | |
3083 | ||
3084 | Look for threads other than the current (TP) that reported a | |
3085 | breakpoint hit and haven't been resumed yet since. */ | |
3086 | ||
3087 | /* If scheduler locking applies, we can avoid iterating over all | |
3088 | threads. */ | |
08036331 | 3089 | if (!non_stop && !schedlock_applies (cur_thr)) |
94cc34af | 3090 | { |
5b6d1e4f PA |
3091 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3092 | resume_ptid)) | |
08036331 | 3093 | { |
f3f8ece4 PA |
3094 | switch_to_thread_no_regs (tp); |
3095 | ||
4d9d9d04 PA |
3096 | /* Ignore the current thread here. It's handled |
3097 | afterwards. */ | |
08036331 | 3098 | if (tp == cur_thr) |
4d9d9d04 | 3099 | continue; |
c906108c | 3100 | |
4d9d9d04 PA |
3101 | if (!thread_still_needs_step_over (tp)) |
3102 | continue; | |
3103 | ||
3104 | gdb_assert (!thread_is_in_step_over_chain (tp)); | |
c906108c | 3105 | |
99619bea PA |
3106 | if (debug_infrun) |
3107 | fprintf_unfiltered (gdb_stdlog, | |
3108 | "infrun: need to step-over [%s] first\n", | |
a068643d | 3109 | target_pid_to_str (tp->ptid).c_str ()); |
99619bea | 3110 | |
4d9d9d04 | 3111 | thread_step_over_chain_enqueue (tp); |
2adfaa28 | 3112 | } |
f3f8ece4 PA |
3113 | |
3114 | switch_to_thread (cur_thr); | |
30852783 UW |
3115 | } |
3116 | ||
4d9d9d04 PA |
3117 | /* Enqueue the current thread last, so that we move all other |
3118 | threads over their breakpoints first. */ | |
08036331 PA |
3119 | if (cur_thr->stepping_over_breakpoint) |
3120 | thread_step_over_chain_enqueue (cur_thr); | |
30852783 | 3121 | |
4d9d9d04 PA |
3122 | /* If the thread isn't started, we'll still need to set its prev_pc, |
3123 | so that switch_back_to_stepped_thread knows the thread hasn't | |
3124 | advanced. Must do this before resuming any thread, as in | |
3125 | all-stop/remote, once we resume we can't send any other packet | |
3126 | until the target stops again. */ | |
fc75c28b | 3127 | cur_thr->prev_pc = regcache_read_pc_protected (regcache); |
99619bea | 3128 | |
a9bc57b9 TT |
3129 | { |
3130 | scoped_restore save_defer_tc = make_scoped_defer_target_commit_resume (); | |
85ad3aaf | 3131 | |
a9bc57b9 | 3132 | started = start_step_over (); |
c906108c | 3133 | |
a9bc57b9 TT |
3134 | if (step_over_info_valid_p ()) |
3135 | { | |
3136 | /* Either this thread started a new in-line step over, or some | |
3137 | other thread was already doing one. In either case, don't | |
3138 | resume anything else until the step-over is finished. */ | |
3139 | } | |
3140 | else if (started && !target_is_non_stop_p ()) | |
3141 | { | |
3142 | /* A new displaced stepping sequence was started. In all-stop, | |
3143 | we can't talk to the target anymore until it next stops. */ | |
3144 | } | |
3145 | else if (!non_stop && target_is_non_stop_p ()) | |
3146 | { | |
3147 | /* In all-stop, but the target is always in non-stop mode. | |
3148 | Start all other threads that are implicitly resumed too. */ | |
5b6d1e4f PA |
3149 | for (thread_info *tp : all_non_exited_threads (resume_target, |
3150 | resume_ptid)) | |
3151 | { | |
3152 | switch_to_thread_no_regs (tp); | |
3153 | ||
f9fac3c8 SM |
3154 | if (!tp->inf->has_execution ()) |
3155 | { | |
3156 | if (debug_infrun) | |
3157 | fprintf_unfiltered (gdb_stdlog, | |
3158 | "infrun: proceed: [%s] target has " | |
3159 | "no execution\n", | |
3160 | target_pid_to_str (tp->ptid).c_str ()); | |
3161 | continue; | |
3162 | } | |
f3f8ece4 | 3163 | |
f9fac3c8 SM |
3164 | if (tp->resumed) |
3165 | { | |
3166 | if (debug_infrun) | |
3167 | fprintf_unfiltered (gdb_stdlog, | |
3168 | "infrun: proceed: [%s] resumed\n", | |
3169 | target_pid_to_str (tp->ptid).c_str ()); | |
3170 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); | |
3171 | continue; | |
3172 | } | |
fbea99ea | 3173 | |
f9fac3c8 SM |
3174 | if (thread_is_in_step_over_chain (tp)) |
3175 | { | |
3176 | if (debug_infrun) | |
3177 | fprintf_unfiltered (gdb_stdlog, | |
3178 | "infrun: proceed: [%s] needs step-over\n", | |
3179 | target_pid_to_str (tp->ptid).c_str ()); | |
3180 | continue; | |
3181 | } | |
fbea99ea | 3182 | |
f9fac3c8 SM |
3183 | if (debug_infrun) |
3184 | fprintf_unfiltered (gdb_stdlog, | |
3185 | "infrun: proceed: resuming %s\n", | |
3186 | target_pid_to_str (tp->ptid).c_str ()); | |
fbea99ea | 3187 | |
f9fac3c8 SM |
3188 | reset_ecs (ecs, tp); |
3189 | switch_to_thread (tp); | |
3190 | keep_going_pass_signal (ecs); | |
3191 | if (!ecs->wait_some_more) | |
3192 | error (_("Command aborted.")); | |
3193 | } | |
a9bc57b9 | 3194 | } |
08036331 | 3195 | else if (!cur_thr->resumed && !thread_is_in_step_over_chain (cur_thr)) |
a9bc57b9 TT |
3196 | { |
3197 | /* The thread wasn't started, and isn't queued, run it now. */ | |
08036331 PA |
3198 | reset_ecs (ecs, cur_thr); |
3199 | switch_to_thread (cur_thr); | |
a9bc57b9 TT |
3200 | keep_going_pass_signal (ecs); |
3201 | if (!ecs->wait_some_more) | |
3202 | error (_("Command aborted.")); | |
3203 | } | |
3204 | } | |
c906108c | 3205 | |
5b6d1e4f | 3206 | commit_resume_all_targets (); |
85ad3aaf | 3207 | |
731f534f | 3208 | finish_state.release (); |
c906108c | 3209 | |
873657b9 PA |
3210 | /* If we've switched threads above, switch back to the previously |
3211 | current thread. We don't want the user to see a different | |
3212 | selected thread. */ | |
3213 | switch_to_thread (cur_thr); | |
3214 | ||
0b333c5e PA |
3215 | /* Tell the event loop to wait for it to stop. If the target |
3216 | supports asynchronous execution, it'll do this from within | |
3217 | target_resume. */ | |
362646f5 | 3218 | if (!target_can_async_p ()) |
0b333c5e | 3219 | mark_async_event_handler (infrun_async_inferior_event_token); |
c906108c | 3220 | } |
c906108c SS |
3221 | \f |
3222 | ||
3223 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 3224 | |
c906108c | 3225 | void |
8621d6a9 | 3226 | start_remote (int from_tty) |
c906108c | 3227 | { |
5b6d1e4f PA |
3228 | inferior *inf = current_inferior (); |
3229 | inf->control.stop_soon = STOP_QUIETLY_REMOTE; | |
43ff13b4 | 3230 | |
1777feb0 | 3231 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 3232 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 3233 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
3234 | nothing is returned (instead of just blocking). Because of this, |
3235 | targets expecting an immediate response need to, internally, set | |
3236 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 3237 | timeout. */ |
6426a772 JM |
3238 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
3239 | differentiate to its caller what the state of the target is after | |
3240 | the initial open has been performed. Here we're assuming that | |
3241 | the target has stopped. It should be possible to eventually have | |
3242 | target_open() return to the caller an indication that the target | |
3243 | is currently running and GDB state should be set to the same as | |
1777feb0 | 3244 | for an async run. */ |
5b6d1e4f | 3245 | wait_for_inferior (inf); |
8621d6a9 DJ |
3246 | |
3247 | /* Now that the inferior has stopped, do any bookkeeping like | |
3248 | loading shared libraries. We want to do this before normal_stop, | |
3249 | so that the displayed frame is up to date. */ | |
8b88a78e | 3250 | post_create_inferior (current_top_target (), from_tty); |
8621d6a9 | 3251 | |
6426a772 | 3252 | normal_stop (); |
c906108c SS |
3253 | } |
3254 | ||
3255 | /* Initialize static vars when a new inferior begins. */ | |
3256 | ||
3257 | void | |
96baa820 | 3258 | init_wait_for_inferior (void) |
c906108c SS |
3259 | { |
3260 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 3261 | |
c906108c SS |
3262 | breakpoint_init_inferior (inf_starting); |
3263 | ||
70509625 | 3264 | clear_proceed_status (0); |
9f976b41 | 3265 | |
ab1ddbcf | 3266 | nullify_last_target_wait_ptid (); |
237fc4c9 | 3267 | |
842951eb | 3268 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3269 | } |
237fc4c9 | 3270 | |
c906108c | 3271 | \f |
488f131b | 3272 | |
ec9499be | 3273 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 3274 | |
568d6575 UW |
3275 | static void handle_step_into_function (struct gdbarch *gdbarch, |
3276 | struct execution_control_state *ecs); | |
3277 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
3278 | struct execution_control_state *ecs); | |
4f5d7f63 | 3279 | static void handle_signal_stop (struct execution_control_state *ecs); |
186c406b | 3280 | static void check_exception_resume (struct execution_control_state *, |
28106bc2 | 3281 | struct frame_info *); |
611c83ae | 3282 | |
bdc36728 | 3283 | static void end_stepping_range (struct execution_control_state *ecs); |
22bcd14b | 3284 | static void stop_waiting (struct execution_control_state *ecs); |
d4f3574e | 3285 | static void keep_going (struct execution_control_state *ecs); |
94c57d6a | 3286 | static void process_event_stop_test (struct execution_control_state *ecs); |
c447ac0b | 3287 | static int switch_back_to_stepped_thread (struct execution_control_state *ecs); |
104c1213 | 3288 | |
252fbfc8 PA |
3289 | /* This function is attached as a "thread_stop_requested" observer. |
3290 | Cleanup local state that assumed the PTID was to be resumed, and | |
3291 | report the stop to the frontend. */ | |
3292 | ||
2c0b251b | 3293 | static void |
252fbfc8 PA |
3294 | infrun_thread_stop_requested (ptid_t ptid) |
3295 | { | |
5b6d1e4f PA |
3296 | process_stratum_target *curr_target = current_inferior ()->process_target (); |
3297 | ||
c65d6b55 PA |
3298 | /* PTID was requested to stop. If the thread was already stopped, |
3299 | but the user/frontend doesn't know about that yet (e.g., the | |
3300 | thread had been temporarily paused for some step-over), set up | |
3301 | for reporting the stop now. */ | |
5b6d1e4f | 3302 | for (thread_info *tp : all_threads (curr_target, ptid)) |
08036331 PA |
3303 | { |
3304 | if (tp->state != THREAD_RUNNING) | |
3305 | continue; | |
3306 | if (tp->executing) | |
3307 | continue; | |
c65d6b55 | 3308 | |
08036331 PA |
3309 | /* Remove matching threads from the step-over queue, so |
3310 | start_step_over doesn't try to resume them | |
3311 | automatically. */ | |
3312 | if (thread_is_in_step_over_chain (tp)) | |
3313 | thread_step_over_chain_remove (tp); | |
c65d6b55 | 3314 | |
08036331 PA |
3315 | /* If the thread is stopped, but the user/frontend doesn't |
3316 | know about that yet, queue a pending event, as if the | |
3317 | thread had just stopped now. Unless the thread already had | |
3318 | a pending event. */ | |
3319 | if (!tp->suspend.waitstatus_pending_p) | |
3320 | { | |
3321 | tp->suspend.waitstatus_pending_p = 1; | |
3322 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_STOPPED; | |
3323 | tp->suspend.waitstatus.value.sig = GDB_SIGNAL_0; | |
3324 | } | |
c65d6b55 | 3325 | |
08036331 PA |
3326 | /* Clear the inline-frame state, since we're re-processing the |
3327 | stop. */ | |
5b6d1e4f | 3328 | clear_inline_frame_state (tp); |
c65d6b55 | 3329 | |
08036331 PA |
3330 | /* If this thread was paused because some other thread was |
3331 | doing an inline-step over, let that finish first. Once | |
3332 | that happens, we'll restart all threads and consume pending | |
3333 | stop events then. */ | |
3334 | if (step_over_info_valid_p ()) | |
3335 | continue; | |
3336 | ||
3337 | /* Otherwise we can process the (new) pending event now. Set | |
3338 | it so this pending event is considered by | |
3339 | do_target_wait. */ | |
719546c4 | 3340 | tp->resumed = true; |
08036331 | 3341 | } |
252fbfc8 PA |
3342 | } |
3343 | ||
a07daef3 PA |
3344 | static void |
3345 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
3346 | { | |
5b6d1e4f PA |
3347 | if (target_last_proc_target == tp->inf->process_target () |
3348 | && target_last_wait_ptid == tp->ptid) | |
a07daef3 PA |
3349 | nullify_last_target_wait_ptid (); |
3350 | } | |
3351 | ||
0cbcdb96 PA |
3352 | /* Delete the step resume, single-step and longjmp/exception resume |
3353 | breakpoints of TP. */ | |
4e1c45ea | 3354 | |
0cbcdb96 PA |
3355 | static void |
3356 | delete_thread_infrun_breakpoints (struct thread_info *tp) | |
4e1c45ea | 3357 | { |
0cbcdb96 PA |
3358 | delete_step_resume_breakpoint (tp); |
3359 | delete_exception_resume_breakpoint (tp); | |
34b7e8a6 | 3360 | delete_single_step_breakpoints (tp); |
4e1c45ea PA |
3361 | } |
3362 | ||
0cbcdb96 PA |
3363 | /* If the target still has execution, call FUNC for each thread that |
3364 | just stopped. In all-stop, that's all the non-exited threads; in | |
3365 | non-stop, that's the current thread, only. */ | |
3366 | ||
3367 | typedef void (*for_each_just_stopped_thread_callback_func) | |
3368 | (struct thread_info *tp); | |
4e1c45ea PA |
3369 | |
3370 | static void | |
0cbcdb96 | 3371 | for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func) |
4e1c45ea | 3372 | { |
d7e15655 | 3373 | if (!target_has_execution || inferior_ptid == null_ptid) |
4e1c45ea PA |
3374 | return; |
3375 | ||
fbea99ea | 3376 | if (target_is_non_stop_p ()) |
4e1c45ea | 3377 | { |
0cbcdb96 PA |
3378 | /* If in non-stop mode, only the current thread stopped. */ |
3379 | func (inferior_thread ()); | |
4e1c45ea PA |
3380 | } |
3381 | else | |
0cbcdb96 | 3382 | { |
0cbcdb96 | 3383 | /* In all-stop mode, all threads have stopped. */ |
08036331 PA |
3384 | for (thread_info *tp : all_non_exited_threads ()) |
3385 | func (tp); | |
0cbcdb96 PA |
3386 | } |
3387 | } | |
3388 | ||
3389 | /* Delete the step resume and longjmp/exception resume breakpoints of | |
3390 | the threads that just stopped. */ | |
3391 | ||
3392 | static void | |
3393 | delete_just_stopped_threads_infrun_breakpoints (void) | |
3394 | { | |
3395 | for_each_just_stopped_thread (delete_thread_infrun_breakpoints); | |
34b7e8a6 PA |
3396 | } |
3397 | ||
3398 | /* Delete the single-step breakpoints of the threads that just | |
3399 | stopped. */ | |
7c16b83e | 3400 | |
34b7e8a6 PA |
3401 | static void |
3402 | delete_just_stopped_threads_single_step_breakpoints (void) | |
3403 | { | |
3404 | for_each_just_stopped_thread (delete_single_step_breakpoints); | |
4e1c45ea PA |
3405 | } |
3406 | ||
221e1a37 | 3407 | /* See infrun.h. */ |
223698f8 | 3408 | |
221e1a37 | 3409 | void |
223698f8 DE |
3410 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, |
3411 | const struct target_waitstatus *ws) | |
3412 | { | |
23fdd69e | 3413 | std::string status_string = target_waitstatus_to_string (ws); |
d7e74731 | 3414 | string_file stb; |
223698f8 DE |
3415 | |
3416 | /* The text is split over several lines because it was getting too long. | |
3417 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
3418 | output as a unit; we want only one timestamp printed if debug_timestamp | |
3419 | is set. */ | |
3420 | ||
d7e74731 | 3421 | stb.printf ("infrun: target_wait (%d.%ld.%ld", |
e99b03dc | 3422 | waiton_ptid.pid (), |
e38504b3 | 3423 | waiton_ptid.lwp (), |
cc6bcb54 | 3424 | waiton_ptid.tid ()); |
e99b03dc | 3425 | if (waiton_ptid.pid () != -1) |
a068643d | 3426 | stb.printf (" [%s]", target_pid_to_str (waiton_ptid).c_str ()); |
d7e74731 PA |
3427 | stb.printf (", status) =\n"); |
3428 | stb.printf ("infrun: %d.%ld.%ld [%s],\n", | |
e99b03dc | 3429 | result_ptid.pid (), |
e38504b3 | 3430 | result_ptid.lwp (), |
cc6bcb54 | 3431 | result_ptid.tid (), |
a068643d | 3432 | target_pid_to_str (result_ptid).c_str ()); |
23fdd69e | 3433 | stb.printf ("infrun: %s\n", status_string.c_str ()); |
223698f8 DE |
3434 | |
3435 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
3436 | a gcc error: the format attribute requires a string literal. */ | |
d7e74731 | 3437 | fprintf_unfiltered (gdb_stdlog, "%s", stb.c_str ()); |
223698f8 DE |
3438 | } |
3439 | ||
372316f1 PA |
3440 | /* Select a thread at random, out of those which are resumed and have |
3441 | had events. */ | |
3442 | ||
3443 | static struct thread_info * | |
5b6d1e4f | 3444 | random_pending_event_thread (inferior *inf, ptid_t waiton_ptid) |
372316f1 | 3445 | { |
372316f1 | 3446 | int num_events = 0; |
08036331 | 3447 | |
5b6d1e4f | 3448 | auto has_event = [&] (thread_info *tp) |
08036331 | 3449 | { |
5b6d1e4f PA |
3450 | return (tp->ptid.matches (waiton_ptid) |
3451 | && tp->resumed | |
08036331 PA |
3452 | && tp->suspend.waitstatus_pending_p); |
3453 | }; | |
372316f1 PA |
3454 | |
3455 | /* First see how many events we have. Count only resumed threads | |
3456 | that have an event pending. */ | |
5b6d1e4f | 3457 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3458 | if (has_event (tp)) |
372316f1 PA |
3459 | num_events++; |
3460 | ||
3461 | if (num_events == 0) | |
3462 | return NULL; | |
3463 | ||
3464 | /* Now randomly pick a thread out of those that have had events. */ | |
08036331 PA |
3465 | int random_selector = (int) ((num_events * (double) rand ()) |
3466 | / (RAND_MAX + 1.0)); | |
372316f1 PA |
3467 | |
3468 | if (debug_infrun && num_events > 1) | |
3469 | fprintf_unfiltered (gdb_stdlog, | |
3470 | "infrun: Found %d events, selecting #%d\n", | |
3471 | num_events, random_selector); | |
3472 | ||
3473 | /* Select the Nth thread that has had an event. */ | |
5b6d1e4f | 3474 | for (thread_info *tp : inf->non_exited_threads ()) |
08036331 | 3475 | if (has_event (tp)) |
372316f1 | 3476 | if (random_selector-- == 0) |
08036331 | 3477 | return tp; |
372316f1 | 3478 | |
08036331 | 3479 | gdb_assert_not_reached ("event thread not found"); |
372316f1 PA |
3480 | } |
3481 | ||
3482 | /* Wrapper for target_wait that first checks whether threads have | |
3483 | pending statuses to report before actually asking the target for | |
5b6d1e4f PA |
3484 | more events. INF is the inferior we're using to call target_wait |
3485 | on. */ | |
372316f1 PA |
3486 | |
3487 | static ptid_t | |
5b6d1e4f PA |
3488 | do_target_wait_1 (inferior *inf, ptid_t ptid, |
3489 | target_waitstatus *status, int options) | |
372316f1 PA |
3490 | { |
3491 | ptid_t event_ptid; | |
3492 | struct thread_info *tp; | |
3493 | ||
24ed6739 AB |
3494 | /* We know that we are looking for an event in the target of inferior |
3495 | INF, but we don't know which thread the event might come from. As | |
3496 | such we want to make sure that INFERIOR_PTID is reset so that none of | |
3497 | the wait code relies on it - doing so is always a mistake. */ | |
3498 | switch_to_inferior_no_thread (inf); | |
3499 | ||
372316f1 PA |
3500 | /* First check if there is a resumed thread with a wait status |
3501 | pending. */ | |
d7e15655 | 3502 | if (ptid == minus_one_ptid || ptid.is_pid ()) |
372316f1 | 3503 | { |
5b6d1e4f | 3504 | tp = random_pending_event_thread (inf, ptid); |
372316f1 PA |
3505 | } |
3506 | else | |
3507 | { | |
3508 | if (debug_infrun) | |
3509 | fprintf_unfiltered (gdb_stdlog, | |
3510 | "infrun: Waiting for specific thread %s.\n", | |
a068643d | 3511 | target_pid_to_str (ptid).c_str ()); |
372316f1 PA |
3512 | |
3513 | /* We have a specific thread to check. */ | |
5b6d1e4f | 3514 | tp = find_thread_ptid (inf, ptid); |
372316f1 PA |
3515 | gdb_assert (tp != NULL); |
3516 | if (!tp->suspend.waitstatus_pending_p) | |
3517 | tp = NULL; | |
3518 | } | |
3519 | ||
3520 | if (tp != NULL | |
3521 | && (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3522 | || tp->suspend.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT)) | |
3523 | { | |
00431a78 | 3524 | struct regcache *regcache = get_thread_regcache (tp); |
ac7936df | 3525 | struct gdbarch *gdbarch = regcache->arch (); |
372316f1 PA |
3526 | CORE_ADDR pc; |
3527 | int discard = 0; | |
3528 | ||
3529 | pc = regcache_read_pc (regcache); | |
3530 | ||
3531 | if (pc != tp->suspend.stop_pc) | |
3532 | { | |
3533 | if (debug_infrun) | |
3534 | fprintf_unfiltered (gdb_stdlog, | |
3535 | "infrun: PC of %s changed. was=%s, now=%s\n", | |
a068643d | 3536 | target_pid_to_str (tp->ptid).c_str (), |
defd2172 | 3537 | paddress (gdbarch, tp->suspend.stop_pc), |
372316f1 PA |
3538 | paddress (gdbarch, pc)); |
3539 | discard = 1; | |
3540 | } | |
a01bda52 | 3541 | else if (!breakpoint_inserted_here_p (regcache->aspace (), pc)) |
372316f1 PA |
3542 | { |
3543 | if (debug_infrun) | |
3544 | fprintf_unfiltered (gdb_stdlog, | |
3545 | "infrun: previous breakpoint of %s, at %s gone\n", | |
a068643d | 3546 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
3547 | paddress (gdbarch, pc)); |
3548 | ||
3549 | discard = 1; | |
3550 | } | |
3551 | ||
3552 | if (discard) | |
3553 | { | |
3554 | if (debug_infrun) | |
3555 | fprintf_unfiltered (gdb_stdlog, | |
3556 | "infrun: pending event of %s cancelled.\n", | |
a068643d | 3557 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
3558 | |
3559 | tp->suspend.waitstatus.kind = TARGET_WAITKIND_SPURIOUS; | |
3560 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3561 | } | |
3562 | } | |
3563 | ||
3564 | if (tp != NULL) | |
3565 | { | |
3566 | if (debug_infrun) | |
3567 | { | |
23fdd69e SM |
3568 | std::string statstr |
3569 | = target_waitstatus_to_string (&tp->suspend.waitstatus); | |
372316f1 | 3570 | |
372316f1 PA |
3571 | fprintf_unfiltered (gdb_stdlog, |
3572 | "infrun: Using pending wait status %s for %s.\n", | |
23fdd69e | 3573 | statstr.c_str (), |
a068643d | 3574 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
3575 | } |
3576 | ||
3577 | /* Now that we've selected our final event LWP, un-adjust its PC | |
3578 | if it was a software breakpoint (and the target doesn't | |
3579 | always adjust the PC itself). */ | |
3580 | if (tp->suspend.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT | |
3581 | && !target_supports_stopped_by_sw_breakpoint ()) | |
3582 | { | |
3583 | struct regcache *regcache; | |
3584 | struct gdbarch *gdbarch; | |
3585 | int decr_pc; | |
3586 | ||
00431a78 | 3587 | regcache = get_thread_regcache (tp); |
ac7936df | 3588 | gdbarch = regcache->arch (); |
372316f1 PA |
3589 | |
3590 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); | |
3591 | if (decr_pc != 0) | |
3592 | { | |
3593 | CORE_ADDR pc; | |
3594 | ||
3595 | pc = regcache_read_pc (regcache); | |
3596 | regcache_write_pc (regcache, pc + decr_pc); | |
3597 | } | |
3598 | } | |
3599 | ||
3600 | tp->suspend.stop_reason = TARGET_STOPPED_BY_NO_REASON; | |
3601 | *status = tp->suspend.waitstatus; | |
3602 | tp->suspend.waitstatus_pending_p = 0; | |
3603 | ||
3604 | /* Wake up the event loop again, until all pending events are | |
3605 | processed. */ | |
3606 | if (target_is_async_p ()) | |
3607 | mark_async_event_handler (infrun_async_inferior_event_token); | |
3608 | return tp->ptid; | |
3609 | } | |
3610 | ||
3611 | /* But if we don't find one, we'll have to wait. */ | |
3612 | ||
3613 | if (deprecated_target_wait_hook) | |
3614 | event_ptid = deprecated_target_wait_hook (ptid, status, options); | |
3615 | else | |
3616 | event_ptid = target_wait (ptid, status, options); | |
3617 | ||
3618 | return event_ptid; | |
3619 | } | |
3620 | ||
5b6d1e4f PA |
3621 | /* Returns true if INF has any resumed thread with a status |
3622 | pending. */ | |
3623 | ||
3624 | static bool | |
3625 | threads_are_resumed_pending_p (inferior *inf) | |
3626 | { | |
3627 | for (thread_info *tp : inf->non_exited_threads ()) | |
3628 | if (tp->resumed | |
3629 | && tp->suspend.waitstatus_pending_p) | |
3630 | return true; | |
3631 | ||
3632 | return false; | |
3633 | } | |
3634 | ||
3635 | /* Wrapper for target_wait that first checks whether threads have | |
3636 | pending statuses to report before actually asking the target for | |
3637 | more events. Polls for events from all inferiors/targets. */ | |
3638 | ||
3639 | static bool | |
3640 | do_target_wait (ptid_t wait_ptid, execution_control_state *ecs, int options) | |
3641 | { | |
3642 | int num_inferiors = 0; | |
3643 | int random_selector; | |
3644 | ||
3645 | /* For fairness, we pick the first inferior/target to poll at | |
3646 | random, and then continue polling the rest of the inferior list | |
3647 | starting from that one in a circular fashion until the whole list | |
3648 | is polled once. */ | |
3649 | ||
3650 | auto inferior_matches = [&wait_ptid] (inferior *inf) | |
3651 | { | |
3652 | return (inf->process_target () != NULL | |
3653 | && (threads_are_executing (inf->process_target ()) | |
3654 | || threads_are_resumed_pending_p (inf)) | |
3655 | && ptid_t (inf->pid).matches (wait_ptid)); | |
3656 | }; | |
3657 | ||
3658 | /* First see how many resumed inferiors we have. */ | |
3659 | for (inferior *inf : all_inferiors ()) | |
3660 | if (inferior_matches (inf)) | |
3661 | num_inferiors++; | |
3662 | ||
3663 | if (num_inferiors == 0) | |
3664 | { | |
3665 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3666 | return false; | |
3667 | } | |
3668 | ||
3669 | /* Now randomly pick an inferior out of those that were resumed. */ | |
3670 | random_selector = (int) | |
3671 | ((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0)); | |
3672 | ||
3673 | if (debug_infrun && num_inferiors > 1) | |
3674 | fprintf_unfiltered (gdb_stdlog, | |
3675 | "infrun: Found %d inferiors, starting at #%d\n", | |
3676 | num_inferiors, random_selector); | |
3677 | ||
3678 | /* Select the Nth inferior that was resumed. */ | |
3679 | ||
3680 | inferior *selected = nullptr; | |
3681 | ||
3682 | for (inferior *inf : all_inferiors ()) | |
3683 | if (inferior_matches (inf)) | |
3684 | if (random_selector-- == 0) | |
3685 | { | |
3686 | selected = inf; | |
3687 | break; | |
3688 | } | |
3689 | ||
3690 | /* Now poll for events out of each of the resumed inferior's | |
3691 | targets, starting from the selected one. */ | |
3692 | ||
3693 | auto do_wait = [&] (inferior *inf) | |
3694 | { | |
5b6d1e4f PA |
3695 | ecs->ptid = do_target_wait_1 (inf, wait_ptid, &ecs->ws, options); |
3696 | ecs->target = inf->process_target (); | |
3697 | return (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
3698 | }; | |
3699 | ||
3700 | /* Needed in all-stop+target-non-stop mode, because we end up here | |
3701 | spuriously after the target is all stopped and we've already | |
3702 | reported the stop to the user, polling for events. */ | |
3703 | scoped_restore_current_thread restore_thread; | |
3704 | ||
3705 | int inf_num = selected->num; | |
3706 | for (inferior *inf = selected; inf != NULL; inf = inf->next) | |
3707 | if (inferior_matches (inf)) | |
3708 | if (do_wait (inf)) | |
3709 | return true; | |
3710 | ||
3711 | for (inferior *inf = inferior_list; | |
3712 | inf != NULL && inf->num < inf_num; | |
3713 | inf = inf->next) | |
3714 | if (inferior_matches (inf)) | |
3715 | if (do_wait (inf)) | |
3716 | return true; | |
3717 | ||
3718 | ecs->ws.kind = TARGET_WAITKIND_IGNORE; | |
3719 | return false; | |
3720 | } | |
3721 | ||
24291992 PA |
3722 | /* Prepare and stabilize the inferior for detaching it. E.g., |
3723 | detaching while a thread is displaced stepping is a recipe for | |
3724 | crashing it, as nothing would readjust the PC out of the scratch | |
3725 | pad. */ | |
3726 | ||
3727 | void | |
3728 | prepare_for_detach (void) | |
3729 | { | |
3730 | struct inferior *inf = current_inferior (); | |
f2907e49 | 3731 | ptid_t pid_ptid = ptid_t (inf->pid); |
24291992 | 3732 | |
00431a78 | 3733 | displaced_step_inferior_state *displaced = get_displaced_stepping_state (inf); |
24291992 PA |
3734 | |
3735 | /* Is any thread of this process displaced stepping? If not, | |
3736 | there's nothing else to do. */ | |
d20172fc | 3737 | if (displaced->step_thread == nullptr) |
24291992 PA |
3738 | return; |
3739 | ||
3740 | if (debug_infrun) | |
3741 | fprintf_unfiltered (gdb_stdlog, | |
3742 | "displaced-stepping in-process while detaching"); | |
3743 | ||
9bcb1f16 | 3744 | scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true); |
24291992 | 3745 | |
00431a78 | 3746 | while (displaced->step_thread != nullptr) |
24291992 | 3747 | { |
24291992 PA |
3748 | struct execution_control_state ecss; |
3749 | struct execution_control_state *ecs; | |
3750 | ||
3751 | ecs = &ecss; | |
3752 | memset (ecs, 0, sizeof (*ecs)); | |
3753 | ||
3754 | overlay_cache_invalid = 1; | |
f15cb84a YQ |
3755 | /* Flush target cache before starting to handle each event. |
3756 | Target was running and cache could be stale. This is just a | |
3757 | heuristic. Running threads may modify target memory, but we | |
3758 | don't get any event. */ | |
3759 | target_dcache_invalidate (); | |
24291992 | 3760 | |
5b6d1e4f | 3761 | do_target_wait (pid_ptid, ecs, 0); |
24291992 PA |
3762 | |
3763 | if (debug_infrun) | |
3764 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
3765 | ||
3766 | /* If an error happens while handling the event, propagate GDB's | |
3767 | knowledge of the executing state to the frontend/user running | |
3768 | state. */ | |
5b6d1e4f PA |
3769 | scoped_finish_thread_state finish_state (inf->process_target (), |
3770 | minus_one_ptid); | |
24291992 PA |
3771 | |
3772 | /* Now figure out what to do with the result of the result. */ | |
3773 | handle_inferior_event (ecs); | |
3774 | ||
3775 | /* No error, don't finish the state yet. */ | |
731f534f | 3776 | finish_state.release (); |
24291992 PA |
3777 | |
3778 | /* Breakpoints and watchpoints are not installed on the target | |
3779 | at this point, and signals are passed directly to the | |
3780 | inferior, so this must mean the process is gone. */ | |
3781 | if (!ecs->wait_some_more) | |
3782 | { | |
9bcb1f16 | 3783 | restore_detaching.release (); |
24291992 PA |
3784 | error (_("Program exited while detaching")); |
3785 | } | |
3786 | } | |
3787 | ||
9bcb1f16 | 3788 | restore_detaching.release (); |
24291992 PA |
3789 | } |
3790 | ||
cd0fc7c3 | 3791 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 3792 | |
cd0fc7c3 SS |
3793 | If inferior gets a signal, we may decide to start it up again |
3794 | instead of returning. That is why there is a loop in this function. | |
3795 | When this function actually returns it means the inferior | |
3796 | should be left stopped and GDB should read more commands. */ | |
3797 | ||
5b6d1e4f PA |
3798 | static void |
3799 | wait_for_inferior (inferior *inf) | |
cd0fc7c3 | 3800 | { |
527159b7 | 3801 | if (debug_infrun) |
ae123ec6 | 3802 | fprintf_unfiltered |
e4c8541f | 3803 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 3804 | |
4c41382a | 3805 | SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); }; |
cd0fc7c3 | 3806 | |
e6f5c25b PA |
3807 | /* If an error happens while handling the event, propagate GDB's |
3808 | knowledge of the executing state to the frontend/user running | |
3809 | state. */ | |
5b6d1e4f PA |
3810 | scoped_finish_thread_state finish_state |
3811 | (inf->process_target (), minus_one_ptid); | |
e6f5c25b | 3812 | |
c906108c SS |
3813 | while (1) |
3814 | { | |
ae25568b PA |
3815 | struct execution_control_state ecss; |
3816 | struct execution_control_state *ecs = &ecss; | |
29f49a6a | 3817 | |
ae25568b PA |
3818 | memset (ecs, 0, sizeof (*ecs)); |
3819 | ||
ec9499be | 3820 | overlay_cache_invalid = 1; |
ec9499be | 3821 | |
f15cb84a YQ |
3822 | /* Flush target cache before starting to handle each event. |
3823 | Target was running and cache could be stale. This is just a | |
3824 | heuristic. Running threads may modify target memory, but we | |
3825 | don't get any event. */ | |
3826 | target_dcache_invalidate (); | |
3827 | ||
5b6d1e4f PA |
3828 | ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0); |
3829 | ecs->target = inf->process_target (); | |
c906108c | 3830 | |
f00150c9 | 3831 | if (debug_infrun) |
5b6d1e4f | 3832 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 3833 | |
cd0fc7c3 SS |
3834 | /* Now figure out what to do with the result of the result. */ |
3835 | handle_inferior_event (ecs); | |
c906108c | 3836 | |
cd0fc7c3 SS |
3837 | if (!ecs->wait_some_more) |
3838 | break; | |
3839 | } | |
4e1c45ea | 3840 | |
e6f5c25b | 3841 | /* No error, don't finish the state yet. */ |
731f534f | 3842 | finish_state.release (); |
cd0fc7c3 | 3843 | } |
c906108c | 3844 | |
d3d4baed PA |
3845 | /* Cleanup that reinstalls the readline callback handler, if the |
3846 | target is running in the background. If while handling the target | |
3847 | event something triggered a secondary prompt, like e.g., a | |
3848 | pagination prompt, we'll have removed the callback handler (see | |
3849 | gdb_readline_wrapper_line). Need to do this as we go back to the | |
3850 | event loop, ready to process further input. Note this has no | |
3851 | effect if the handler hasn't actually been removed, because calling | |
3852 | rl_callback_handler_install resets the line buffer, thus losing | |
3853 | input. */ | |
3854 | ||
3855 | static void | |
d238133d | 3856 | reinstall_readline_callback_handler_cleanup () |
d3d4baed | 3857 | { |
3b12939d PA |
3858 | struct ui *ui = current_ui; |
3859 | ||
3860 | if (!ui->async) | |
6c400b59 PA |
3861 | { |
3862 | /* We're not going back to the top level event loop yet. Don't | |
3863 | install the readline callback, as it'd prep the terminal, | |
3864 | readline-style (raw, noecho) (e.g., --batch). We'll install | |
3865 | it the next time the prompt is displayed, when we're ready | |
3866 | for input. */ | |
3867 | return; | |
3868 | } | |
3869 | ||
3b12939d | 3870 | if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED) |
d3d4baed PA |
3871 | gdb_rl_callback_handler_reinstall (); |
3872 | } | |
3873 | ||
243a9253 PA |
3874 | /* Clean up the FSMs of threads that are now stopped. In non-stop, |
3875 | that's just the event thread. In all-stop, that's all threads. */ | |
3876 | ||
3877 | static void | |
3878 | clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs) | |
3879 | { | |
08036331 PA |
3880 | if (ecs->event_thread != NULL |
3881 | && ecs->event_thread->thread_fsm != NULL) | |
46e3ed7f | 3882 | ecs->event_thread->thread_fsm->clean_up (ecs->event_thread); |
243a9253 PA |
3883 | |
3884 | if (!non_stop) | |
3885 | { | |
08036331 | 3886 | for (thread_info *thr : all_non_exited_threads ()) |
243a9253 PA |
3887 | { |
3888 | if (thr->thread_fsm == NULL) | |
3889 | continue; | |
3890 | if (thr == ecs->event_thread) | |
3891 | continue; | |
3892 | ||
00431a78 | 3893 | switch_to_thread (thr); |
46e3ed7f | 3894 | thr->thread_fsm->clean_up (thr); |
243a9253 PA |
3895 | } |
3896 | ||
3897 | if (ecs->event_thread != NULL) | |
00431a78 | 3898 | switch_to_thread (ecs->event_thread); |
243a9253 PA |
3899 | } |
3900 | } | |
3901 | ||
3b12939d PA |
3902 | /* Helper for all_uis_check_sync_execution_done that works on the |
3903 | current UI. */ | |
3904 | ||
3905 | static void | |
3906 | check_curr_ui_sync_execution_done (void) | |
3907 | { | |
3908 | struct ui *ui = current_ui; | |
3909 | ||
3910 | if (ui->prompt_state == PROMPT_NEEDED | |
3911 | && ui->async | |
3912 | && !gdb_in_secondary_prompt_p (ui)) | |
3913 | { | |
223ffa71 | 3914 | target_terminal::ours (); |
76727919 | 3915 | gdb::observers::sync_execution_done.notify (); |
3eb7562a | 3916 | ui_register_input_event_handler (ui); |
3b12939d PA |
3917 | } |
3918 | } | |
3919 | ||
3920 | /* See infrun.h. */ | |
3921 | ||
3922 | void | |
3923 | all_uis_check_sync_execution_done (void) | |
3924 | { | |
0e454242 | 3925 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
3926 | { |
3927 | check_curr_ui_sync_execution_done (); | |
3928 | } | |
3929 | } | |
3930 | ||
a8836c93 PA |
3931 | /* See infrun.h. */ |
3932 | ||
3933 | void | |
3934 | all_uis_on_sync_execution_starting (void) | |
3935 | { | |
0e454242 | 3936 | SWITCH_THRU_ALL_UIS () |
a8836c93 PA |
3937 | { |
3938 | if (current_ui->prompt_state == PROMPT_NEEDED) | |
3939 | async_disable_stdin (); | |
3940 | } | |
3941 | } | |
3942 | ||
1777feb0 | 3943 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 3944 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
3945 | descriptor corresponding to the target. It can be called more than |
3946 | once to complete a single execution command. In such cases we need | |
3947 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
3948 | that this function is called for a single execution command, then |
3949 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 3950 | necessary cleanups. */ |
43ff13b4 JM |
3951 | |
3952 | void | |
fba45db2 | 3953 | fetch_inferior_event (void *client_data) |
43ff13b4 | 3954 | { |
0d1e5fa7 | 3955 | struct execution_control_state ecss; |
a474d7c2 | 3956 | struct execution_control_state *ecs = &ecss; |
0f641c01 | 3957 | int cmd_done = 0; |
43ff13b4 | 3958 | |
0d1e5fa7 PA |
3959 | memset (ecs, 0, sizeof (*ecs)); |
3960 | ||
c61db772 PA |
3961 | /* Events are always processed with the main UI as current UI. This |
3962 | way, warnings, debug output, etc. are always consistently sent to | |
3963 | the main console. */ | |
4b6749b9 | 3964 | scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui); |
c61db772 | 3965 | |
d3d4baed | 3966 | /* End up with readline processing input, if necessary. */ |
d238133d TT |
3967 | { |
3968 | SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); }; | |
3969 | ||
3970 | /* We're handling a live event, so make sure we're doing live | |
3971 | debugging. If we're looking at traceframes while the target is | |
3972 | running, we're going to need to get back to that mode after | |
3973 | handling the event. */ | |
3974 | gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe; | |
3975 | if (non_stop) | |
3976 | { | |
3977 | maybe_restore_traceframe.emplace (); | |
3978 | set_current_traceframe (-1); | |
3979 | } | |
43ff13b4 | 3980 | |
873657b9 PA |
3981 | /* The user/frontend should not notice a thread switch due to |
3982 | internal events. Make sure we revert to the user selected | |
3983 | thread and frame after handling the event and running any | |
3984 | breakpoint commands. */ | |
3985 | scoped_restore_current_thread restore_thread; | |
d238133d TT |
3986 | |
3987 | overlay_cache_invalid = 1; | |
3988 | /* Flush target cache before starting to handle each event. Target | |
3989 | was running and cache could be stale. This is just a heuristic. | |
3990 | Running threads may modify target memory, but we don't get any | |
3991 | event. */ | |
3992 | target_dcache_invalidate (); | |
3993 | ||
3994 | scoped_restore save_exec_dir | |
3995 | = make_scoped_restore (&execution_direction, | |
3996 | target_execution_direction ()); | |
3997 | ||
5b6d1e4f PA |
3998 | if (!do_target_wait (minus_one_ptid, ecs, TARGET_WNOHANG)) |
3999 | return; | |
4000 | ||
4001 | gdb_assert (ecs->ws.kind != TARGET_WAITKIND_IGNORE); | |
4002 | ||
4003 | /* Switch to the target that generated the event, so we can do | |
4004 | target calls. Any inferior bound to the target will do, so we | |
4005 | just switch to the first we find. */ | |
4006 | for (inferior *inf : all_inferiors (ecs->target)) | |
4007 | { | |
4008 | switch_to_inferior_no_thread (inf); | |
4009 | break; | |
4010 | } | |
d238133d TT |
4011 | |
4012 | if (debug_infrun) | |
5b6d1e4f | 4013 | print_target_wait_results (minus_one_ptid, ecs->ptid, &ecs->ws); |
d238133d TT |
4014 | |
4015 | /* If an error happens while handling the event, propagate GDB's | |
4016 | knowledge of the executing state to the frontend/user running | |
4017 | state. */ | |
4018 | ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid; | |
5b6d1e4f | 4019 | scoped_finish_thread_state finish_state (ecs->target, finish_ptid); |
d238133d | 4020 | |
979a0d13 | 4021 | /* Get executed before scoped_restore_current_thread above to apply |
d238133d TT |
4022 | still for the thread which has thrown the exception. */ |
4023 | auto defer_bpstat_clear | |
4024 | = make_scope_exit (bpstat_clear_actions); | |
4025 | auto defer_delete_threads | |
4026 | = make_scope_exit (delete_just_stopped_threads_infrun_breakpoints); | |
4027 | ||
4028 | /* Now figure out what to do with the result of the result. */ | |
4029 | handle_inferior_event (ecs); | |
4030 | ||
4031 | if (!ecs->wait_some_more) | |
4032 | { | |
5b6d1e4f | 4033 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
d238133d TT |
4034 | int should_stop = 1; |
4035 | struct thread_info *thr = ecs->event_thread; | |
d6b48e9c | 4036 | |
d238133d | 4037 | delete_just_stopped_threads_infrun_breakpoints (); |
f107f563 | 4038 | |
d238133d TT |
4039 | if (thr != NULL) |
4040 | { | |
4041 | struct thread_fsm *thread_fsm = thr->thread_fsm; | |
243a9253 | 4042 | |
d238133d | 4043 | if (thread_fsm != NULL) |
46e3ed7f | 4044 | should_stop = thread_fsm->should_stop (thr); |
d238133d | 4045 | } |
243a9253 | 4046 | |
d238133d TT |
4047 | if (!should_stop) |
4048 | { | |
4049 | keep_going (ecs); | |
4050 | } | |
4051 | else | |
4052 | { | |
46e3ed7f | 4053 | bool should_notify_stop = true; |
d238133d | 4054 | int proceeded = 0; |
1840d81a | 4055 | |
d238133d | 4056 | clean_up_just_stopped_threads_fsms (ecs); |
243a9253 | 4057 | |
d238133d | 4058 | if (thr != NULL && thr->thread_fsm != NULL) |
46e3ed7f | 4059 | should_notify_stop = thr->thread_fsm->should_notify_stop (); |
388a7084 | 4060 | |
d238133d TT |
4061 | if (should_notify_stop) |
4062 | { | |
4063 | /* We may not find an inferior if this was a process exit. */ | |
4064 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) | |
4065 | proceeded = normal_stop (); | |
4066 | } | |
243a9253 | 4067 | |
d238133d TT |
4068 | if (!proceeded) |
4069 | { | |
4070 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
4071 | cmd_done = 1; | |
4072 | } | |
873657b9 PA |
4073 | |
4074 | /* If we got a TARGET_WAITKIND_NO_RESUMED event, then the | |
4075 | previously selected thread is gone. We have two | |
4076 | choices - switch to no thread selected, or restore the | |
4077 | previously selected thread (now exited). We chose the | |
4078 | later, just because that's what GDB used to do. After | |
4079 | this, "info threads" says "The current thread <Thread | |
4080 | ID 2> has terminated." instead of "No thread | |
4081 | selected.". */ | |
4082 | if (!non_stop | |
4083 | && cmd_done | |
4084 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
4085 | restore_thread.dont_restore (); | |
d238133d TT |
4086 | } |
4087 | } | |
4f8d22e3 | 4088 | |
d238133d TT |
4089 | defer_delete_threads.release (); |
4090 | defer_bpstat_clear.release (); | |
29f49a6a | 4091 | |
d238133d TT |
4092 | /* No error, don't finish the thread states yet. */ |
4093 | finish_state.release (); | |
731f534f | 4094 | |
d238133d TT |
4095 | /* This scope is used to ensure that readline callbacks are |
4096 | reinstalled here. */ | |
4097 | } | |
4f8d22e3 | 4098 | |
3b12939d PA |
4099 | /* If a UI was in sync execution mode, and now isn't, restore its |
4100 | prompt (a synchronous execution command has finished, and we're | |
4101 | ready for input). */ | |
4102 | all_uis_check_sync_execution_done (); | |
0f641c01 PA |
4103 | |
4104 | if (cmd_done | |
0f641c01 | 4105 | && exec_done_display_p |
00431a78 PA |
4106 | && (inferior_ptid == null_ptid |
4107 | || inferior_thread ()->state != THREAD_RUNNING)) | |
0f641c01 | 4108 | printf_unfiltered (_("completed.\n")); |
43ff13b4 JM |
4109 | } |
4110 | ||
29734269 SM |
4111 | /* See infrun.h. */ |
4112 | ||
edb3359d | 4113 | void |
29734269 SM |
4114 | set_step_info (thread_info *tp, struct frame_info *frame, |
4115 | struct symtab_and_line sal) | |
edb3359d | 4116 | { |
29734269 SM |
4117 | /* This can be removed once this function no longer implicitly relies on the |
4118 | inferior_ptid value. */ | |
4119 | gdb_assert (inferior_ptid == tp->ptid); | |
edb3359d | 4120 | |
16c381f0 JK |
4121 | tp->control.step_frame_id = get_frame_id (frame); |
4122 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
4123 | |
4124 | tp->current_symtab = sal.symtab; | |
4125 | tp->current_line = sal.line; | |
4126 | } | |
4127 | ||
0d1e5fa7 PA |
4128 | /* Clear context switchable stepping state. */ |
4129 | ||
4130 | void | |
4e1c45ea | 4131 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 | 4132 | { |
7f5ef605 | 4133 | tss->stepped_breakpoint = 0; |
0d1e5fa7 | 4134 | tss->stepping_over_breakpoint = 0; |
963f9c80 | 4135 | tss->stepping_over_watchpoint = 0; |
0d1e5fa7 | 4136 | tss->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 SS |
4137 | } |
4138 | ||
ab1ddbcf | 4139 | /* See infrun.h. */ |
c32c64b7 | 4140 | |
6efcd9a8 | 4141 | void |
5b6d1e4f PA |
4142 | set_last_target_status (process_stratum_target *target, ptid_t ptid, |
4143 | target_waitstatus status) | |
c32c64b7 | 4144 | { |
5b6d1e4f | 4145 | target_last_proc_target = target; |
c32c64b7 DE |
4146 | target_last_wait_ptid = ptid; |
4147 | target_last_waitstatus = status; | |
4148 | } | |
4149 | ||
ab1ddbcf | 4150 | /* See infrun.h. */ |
e02bc4cc DS |
4151 | |
4152 | void | |
5b6d1e4f PA |
4153 | get_last_target_status (process_stratum_target **target, ptid_t *ptid, |
4154 | target_waitstatus *status) | |
e02bc4cc | 4155 | { |
5b6d1e4f PA |
4156 | if (target != nullptr) |
4157 | *target = target_last_proc_target; | |
ab1ddbcf PA |
4158 | if (ptid != nullptr) |
4159 | *ptid = target_last_wait_ptid; | |
4160 | if (status != nullptr) | |
4161 | *status = target_last_waitstatus; | |
e02bc4cc DS |
4162 | } |
4163 | ||
ab1ddbcf PA |
4164 | /* See infrun.h. */ |
4165 | ||
ac264b3b MS |
4166 | void |
4167 | nullify_last_target_wait_ptid (void) | |
4168 | { | |
5b6d1e4f | 4169 | target_last_proc_target = nullptr; |
ac264b3b | 4170 | target_last_wait_ptid = minus_one_ptid; |
ab1ddbcf | 4171 | target_last_waitstatus = {}; |
ac264b3b MS |
4172 | } |
4173 | ||
dcf4fbde | 4174 | /* Switch thread contexts. */ |
dd80620e MS |
4175 | |
4176 | static void | |
00431a78 | 4177 | context_switch (execution_control_state *ecs) |
dd80620e | 4178 | { |
00431a78 PA |
4179 | if (debug_infrun |
4180 | && ecs->ptid != inferior_ptid | |
5b6d1e4f PA |
4181 | && (inferior_ptid == null_ptid |
4182 | || ecs->event_thread != inferior_thread ())) | |
fd48f117 DJ |
4183 | { |
4184 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
a068643d | 4185 | target_pid_to_str (inferior_ptid).c_str ()); |
fd48f117 | 4186 | fprintf_unfiltered (gdb_stdlog, "to %s\n", |
a068643d | 4187 | target_pid_to_str (ecs->ptid).c_str ()); |
fd48f117 DJ |
4188 | } |
4189 | ||
00431a78 | 4190 | switch_to_thread (ecs->event_thread); |
dd80620e MS |
4191 | } |
4192 | ||
d8dd4d5f PA |
4193 | /* If the target can't tell whether we've hit breakpoints |
4194 | (target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP, | |
4195 | check whether that could have been caused by a breakpoint. If so, | |
4196 | adjust the PC, per gdbarch_decr_pc_after_break. */ | |
4197 | ||
4fa8626c | 4198 | static void |
d8dd4d5f PA |
4199 | adjust_pc_after_break (struct thread_info *thread, |
4200 | struct target_waitstatus *ws) | |
4fa8626c | 4201 | { |
24a73cce UW |
4202 | struct regcache *regcache; |
4203 | struct gdbarch *gdbarch; | |
118e6252 | 4204 | CORE_ADDR breakpoint_pc, decr_pc; |
4fa8626c | 4205 | |
4fa8626c DJ |
4206 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
4207 | we aren't, just return. | |
9709f61c DJ |
4208 | |
4209 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
4210 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
4211 | implemented by software breakpoints should be handled through the normal | |
4212 | breakpoint layer. | |
8fb3e588 | 4213 | |
4fa8626c DJ |
4214 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
4215 | different signals (SIGILL or SIGEMT for instance), but it is less | |
4216 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
4217 | gdbarch_decr_pc_after_break. I don't know any specific target that |
4218 | generates these signals at breakpoints (the code has been in GDB since at | |
4219 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 4220 | |
e6cf7916 UW |
4221 | In earlier versions of GDB, a target with |
4222 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
4223 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
4224 | target with both of these set in GDB history, and it seems unlikely to be | |
4225 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c | 4226 | |
d8dd4d5f | 4227 | if (ws->kind != TARGET_WAITKIND_STOPPED) |
4fa8626c DJ |
4228 | return; |
4229 | ||
d8dd4d5f | 4230 | if (ws->value.sig != GDB_SIGNAL_TRAP) |
4fa8626c DJ |
4231 | return; |
4232 | ||
4058b839 PA |
4233 | /* In reverse execution, when a breakpoint is hit, the instruction |
4234 | under it has already been de-executed. The reported PC always | |
4235 | points at the breakpoint address, so adjusting it further would | |
4236 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
4237 | architecture: | |
4238 | ||
4239 | B1 0x08000000 : INSN1 | |
4240 | B2 0x08000001 : INSN2 | |
4241 | 0x08000002 : INSN3 | |
4242 | PC -> 0x08000003 : INSN4 | |
4243 | ||
4244 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
4245 | from that point should hit B2 as below. Reading the PC when the | |
4246 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
4247 | been de-executed already. | |
4248 | ||
4249 | B1 0x08000000 : INSN1 | |
4250 | B2 PC -> 0x08000001 : INSN2 | |
4251 | 0x08000002 : INSN3 | |
4252 | 0x08000003 : INSN4 | |
4253 | ||
4254 | We can't apply the same logic as for forward execution, because | |
4255 | we would wrongly adjust the PC to 0x08000000, since there's a | |
4256 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
4257 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
4258 | behaviour. */ | |
4259 | if (execution_direction == EXEC_REVERSE) | |
4260 | return; | |
4261 | ||
1cf4d951 PA |
4262 | /* If the target can tell whether the thread hit a SW breakpoint, |
4263 | trust it. Targets that can tell also adjust the PC | |
4264 | themselves. */ | |
4265 | if (target_supports_stopped_by_sw_breakpoint ()) | |
4266 | return; | |
4267 | ||
4268 | /* Note that relying on whether a breakpoint is planted in memory to | |
4269 | determine this can fail. E.g,. the breakpoint could have been | |
4270 | removed since. Or the thread could have been told to step an | |
4271 | instruction the size of a breakpoint instruction, and only | |
4272 | _after_ was a breakpoint inserted at its address. */ | |
4273 | ||
24a73cce UW |
4274 | /* If this target does not decrement the PC after breakpoints, then |
4275 | we have nothing to do. */ | |
00431a78 | 4276 | regcache = get_thread_regcache (thread); |
ac7936df | 4277 | gdbarch = regcache->arch (); |
118e6252 | 4278 | |
527a273a | 4279 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
118e6252 | 4280 | if (decr_pc == 0) |
24a73cce UW |
4281 | return; |
4282 | ||
8b86c959 | 4283 | const address_space *aspace = regcache->aspace (); |
6c95b8df | 4284 | |
8aad930b AC |
4285 | /* Find the location where (if we've hit a breakpoint) the |
4286 | breakpoint would be. */ | |
118e6252 | 4287 | breakpoint_pc = regcache_read_pc (regcache) - decr_pc; |
8aad930b | 4288 | |
1cf4d951 PA |
4289 | /* If the target can't tell whether a software breakpoint triggered, |
4290 | fallback to figuring it out based on breakpoints we think were | |
4291 | inserted in the target, and on whether the thread was stepped or | |
4292 | continued. */ | |
4293 | ||
1c5cfe86 PA |
4294 | /* Check whether there actually is a software breakpoint inserted at |
4295 | that location. | |
4296 | ||
4297 | If in non-stop mode, a race condition is possible where we've | |
4298 | removed a breakpoint, but stop events for that breakpoint were | |
4299 | already queued and arrive later. To suppress those spurious | |
4300 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
1cf4d951 PA |
4301 | and retire them after a number of stop events are reported. Note |
4302 | this is an heuristic and can thus get confused. The real fix is | |
4303 | to get the "stopped by SW BP and needs adjustment" info out of | |
4304 | the target/kernel (and thus never reach here; see above). */ | |
6c95b8df | 4305 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
fbea99ea PA |
4306 | || (target_is_non_stop_p () |
4307 | && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 4308 | { |
07036511 | 4309 | gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable; |
abbb1732 | 4310 | |
8213266a | 4311 | if (record_full_is_used ()) |
07036511 TT |
4312 | restore_operation_disable.emplace |
4313 | (record_full_gdb_operation_disable_set ()); | |
96429cc8 | 4314 | |
1c0fdd0e UW |
4315 | /* When using hardware single-step, a SIGTRAP is reported for both |
4316 | a completed single-step and a software breakpoint. Need to | |
4317 | differentiate between the two, as the latter needs adjusting | |
4318 | but the former does not. | |
4319 | ||
4320 | The SIGTRAP can be due to a completed hardware single-step only if | |
4321 | - we didn't insert software single-step breakpoints | |
1c0fdd0e UW |
4322 | - this thread is currently being stepped |
4323 | ||
4324 | If any of these events did not occur, we must have stopped due | |
4325 | to hitting a software breakpoint, and have to back up to the | |
4326 | breakpoint address. | |
4327 | ||
4328 | As a special case, we could have hardware single-stepped a | |
4329 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
4330 | we also need to back up to the breakpoint address. */ | |
4331 | ||
d8dd4d5f PA |
4332 | if (thread_has_single_step_breakpoints_set (thread) |
4333 | || !currently_stepping (thread) | |
4334 | || (thread->stepped_breakpoint | |
4335 | && thread->prev_pc == breakpoint_pc)) | |
515630c5 | 4336 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 4337 | } |
4fa8626c DJ |
4338 | } |
4339 | ||
edb3359d DJ |
4340 | static int |
4341 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
4342 | { | |
4343 | for (frame = get_prev_frame (frame); | |
4344 | frame != NULL; | |
4345 | frame = get_prev_frame (frame)) | |
4346 | { | |
4347 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
4348 | return 1; | |
4349 | if (get_frame_type (frame) != INLINE_FRAME) | |
4350 | break; | |
4351 | } | |
4352 | ||
4353 | return 0; | |
4354 | } | |
4355 | ||
4a4c04f1 BE |
4356 | /* Look for an inline frame that is marked for skip. |
4357 | If PREV_FRAME is TRUE start at the previous frame, | |
4358 | otherwise start at the current frame. Stop at the | |
4359 | first non-inline frame, or at the frame where the | |
4360 | step started. */ | |
4361 | ||
4362 | static bool | |
4363 | inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp) | |
4364 | { | |
4365 | struct frame_info *frame = get_current_frame (); | |
4366 | ||
4367 | if (prev_frame) | |
4368 | frame = get_prev_frame (frame); | |
4369 | ||
4370 | for (; frame != NULL; frame = get_prev_frame (frame)) | |
4371 | { | |
4372 | const char *fn = NULL; | |
4373 | symtab_and_line sal; | |
4374 | struct symbol *sym; | |
4375 | ||
4376 | if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id)) | |
4377 | break; | |
4378 | if (get_frame_type (frame) != INLINE_FRAME) | |
4379 | break; | |
4380 | ||
4381 | sal = find_frame_sal (frame); | |
4382 | sym = get_frame_function (frame); | |
4383 | ||
4384 | if (sym != NULL) | |
4385 | fn = sym->print_name (); | |
4386 | ||
4387 | if (sal.line != 0 | |
4388 | && function_name_is_marked_for_skip (fn, sal)) | |
4389 | return true; | |
4390 | } | |
4391 | ||
4392 | return false; | |
4393 | } | |
4394 | ||
c65d6b55 PA |
4395 | /* If the event thread has the stop requested flag set, pretend it |
4396 | stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to | |
4397 | target_stop). */ | |
4398 | ||
4399 | static bool | |
4400 | handle_stop_requested (struct execution_control_state *ecs) | |
4401 | { | |
4402 | if (ecs->event_thread->stop_requested) | |
4403 | { | |
4404 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
4405 | ecs->ws.value.sig = GDB_SIGNAL_0; | |
4406 | handle_signal_stop (ecs); | |
4407 | return true; | |
4408 | } | |
4409 | return false; | |
4410 | } | |
4411 | ||
a96d9b2e SDJ |
4412 | /* Auxiliary function that handles syscall entry/return events. |
4413 | It returns 1 if the inferior should keep going (and GDB | |
4414 | should ignore the event), or 0 if the event deserves to be | |
4415 | processed. */ | |
ca2163eb | 4416 | |
a96d9b2e | 4417 | static int |
ca2163eb | 4418 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 4419 | { |
ca2163eb | 4420 | struct regcache *regcache; |
ca2163eb PA |
4421 | int syscall_number; |
4422 | ||
00431a78 | 4423 | context_switch (ecs); |
ca2163eb | 4424 | |
00431a78 | 4425 | regcache = get_thread_regcache (ecs->event_thread); |
f90263c1 | 4426 | syscall_number = ecs->ws.value.syscall_number; |
f2ffa92b | 4427 | ecs->event_thread->suspend.stop_pc = regcache_read_pc (regcache); |
ca2163eb | 4428 | |
a96d9b2e SDJ |
4429 | if (catch_syscall_enabled () > 0 |
4430 | && catching_syscall_number (syscall_number) > 0) | |
4431 | { | |
4432 | if (debug_infrun) | |
4433 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
4434 | syscall_number); | |
a96d9b2e | 4435 | |
16c381f0 | 4436 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 4437 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
4438 | ecs->event_thread->suspend.stop_pc, |
4439 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 4440 | |
c65d6b55 PA |
4441 | if (handle_stop_requested (ecs)) |
4442 | return 0; | |
4443 | ||
ce12b012 | 4444 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
ca2163eb PA |
4445 | { |
4446 | /* Catchpoint hit. */ | |
ca2163eb PA |
4447 | return 0; |
4448 | } | |
a96d9b2e | 4449 | } |
ca2163eb | 4450 | |
c65d6b55 PA |
4451 | if (handle_stop_requested (ecs)) |
4452 | return 0; | |
4453 | ||
ca2163eb | 4454 | /* If no catchpoint triggered for this, then keep going. */ |
ca2163eb PA |
4455 | keep_going (ecs); |
4456 | return 1; | |
a96d9b2e SDJ |
4457 | } |
4458 | ||
7e324e48 GB |
4459 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ |
4460 | ||
4461 | static void | |
4462 | fill_in_stop_func (struct gdbarch *gdbarch, | |
4463 | struct execution_control_state *ecs) | |
4464 | { | |
4465 | if (!ecs->stop_func_filled_in) | |
4466 | { | |
98a617f8 KB |
4467 | const block *block; |
4468 | ||
7e324e48 GB |
4469 | /* Don't care about return value; stop_func_start and stop_func_name |
4470 | will both be 0 if it doesn't work. */ | |
98a617f8 KB |
4471 | find_pc_partial_function (ecs->event_thread->suspend.stop_pc, |
4472 | &ecs->stop_func_name, | |
4473 | &ecs->stop_func_start, | |
4474 | &ecs->stop_func_end, | |
4475 | &block); | |
4476 | ||
4477 | /* The call to find_pc_partial_function, above, will set | |
4478 | stop_func_start and stop_func_end to the start and end | |
4479 | of the range containing the stop pc. If this range | |
4480 | contains the entry pc for the block (which is always the | |
4481 | case for contiguous blocks), advance stop_func_start past | |
4482 | the function's start offset and entrypoint. Note that | |
4483 | stop_func_start is NOT advanced when in a range of a | |
4484 | non-contiguous block that does not contain the entry pc. */ | |
4485 | if (block != nullptr | |
4486 | && ecs->stop_func_start <= BLOCK_ENTRY_PC (block) | |
4487 | && BLOCK_ENTRY_PC (block) < ecs->stop_func_end) | |
4488 | { | |
4489 | ecs->stop_func_start | |
4490 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
4491 | ||
4492 | if (gdbarch_skip_entrypoint_p (gdbarch)) | |
4493 | ecs->stop_func_start | |
4494 | = gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start); | |
4495 | } | |
591a12a1 | 4496 | |
7e324e48 GB |
4497 | ecs->stop_func_filled_in = 1; |
4498 | } | |
4499 | } | |
4500 | ||
4f5d7f63 | 4501 | |
00431a78 | 4502 | /* Return the STOP_SOON field of the inferior pointed at by ECS. */ |
4f5d7f63 PA |
4503 | |
4504 | static enum stop_kind | |
00431a78 | 4505 | get_inferior_stop_soon (execution_control_state *ecs) |
4f5d7f63 | 4506 | { |
5b6d1e4f | 4507 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
4f5d7f63 PA |
4508 | |
4509 | gdb_assert (inf != NULL); | |
4510 | return inf->control.stop_soon; | |
4511 | } | |
4512 | ||
5b6d1e4f PA |
4513 | /* Poll for one event out of the current target. Store the resulting |
4514 | waitstatus in WS, and return the event ptid. Does not block. */ | |
372316f1 PA |
4515 | |
4516 | static ptid_t | |
5b6d1e4f | 4517 | poll_one_curr_target (struct target_waitstatus *ws) |
372316f1 PA |
4518 | { |
4519 | ptid_t event_ptid; | |
372316f1 PA |
4520 | |
4521 | overlay_cache_invalid = 1; | |
4522 | ||
4523 | /* Flush target cache before starting to handle each event. | |
4524 | Target was running and cache could be stale. This is just a | |
4525 | heuristic. Running threads may modify target memory, but we | |
4526 | don't get any event. */ | |
4527 | target_dcache_invalidate (); | |
4528 | ||
4529 | if (deprecated_target_wait_hook) | |
5b6d1e4f | 4530 | event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 | 4531 | else |
5b6d1e4f | 4532 | event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); |
372316f1 PA |
4533 | |
4534 | if (debug_infrun) | |
5b6d1e4f | 4535 | print_target_wait_results (minus_one_ptid, event_ptid, ws); |
372316f1 PA |
4536 | |
4537 | return event_ptid; | |
4538 | } | |
4539 | ||
5b6d1e4f PA |
4540 | /* An event reported by wait_one. */ |
4541 | ||
4542 | struct wait_one_event | |
4543 | { | |
4544 | /* The target the event came out of. */ | |
4545 | process_stratum_target *target; | |
4546 | ||
4547 | /* The PTID the event was for. */ | |
4548 | ptid_t ptid; | |
4549 | ||
4550 | /* The waitstatus. */ | |
4551 | target_waitstatus ws; | |
4552 | }; | |
4553 | ||
4554 | /* Wait for one event out of any target. */ | |
4555 | ||
4556 | static wait_one_event | |
4557 | wait_one () | |
4558 | { | |
4559 | while (1) | |
4560 | { | |
4561 | for (inferior *inf : all_inferiors ()) | |
4562 | { | |
4563 | process_stratum_target *target = inf->process_target (); | |
4564 | if (target == NULL | |
4565 | || !target->is_async_p () | |
4566 | || !target->threads_executing) | |
4567 | continue; | |
4568 | ||
4569 | switch_to_inferior_no_thread (inf); | |
4570 | ||
4571 | wait_one_event event; | |
4572 | event.target = target; | |
4573 | event.ptid = poll_one_curr_target (&event.ws); | |
4574 | ||
4575 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED) | |
4576 | { | |
4577 | /* If nothing is resumed, remove the target from the | |
4578 | event loop. */ | |
4579 | target_async (0); | |
4580 | } | |
4581 | else if (event.ws.kind != TARGET_WAITKIND_IGNORE) | |
4582 | return event; | |
4583 | } | |
4584 | ||
4585 | /* Block waiting for some event. */ | |
4586 | ||
4587 | fd_set readfds; | |
4588 | int nfds = 0; | |
4589 | ||
4590 | FD_ZERO (&readfds); | |
4591 | ||
4592 | for (inferior *inf : all_inferiors ()) | |
4593 | { | |
4594 | process_stratum_target *target = inf->process_target (); | |
4595 | if (target == NULL | |
4596 | || !target->is_async_p () | |
4597 | || !target->threads_executing) | |
4598 | continue; | |
4599 | ||
4600 | int fd = target->async_wait_fd (); | |
4601 | FD_SET (fd, &readfds); | |
4602 | if (nfds <= fd) | |
4603 | nfds = fd + 1; | |
4604 | } | |
4605 | ||
4606 | if (nfds == 0) | |
4607 | { | |
4608 | /* No waitable targets left. All must be stopped. */ | |
4609 | return {NULL, minus_one_ptid, {TARGET_WAITKIND_NO_RESUMED}}; | |
4610 | } | |
4611 | ||
4612 | QUIT; | |
4613 | ||
4614 | int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0); | |
4615 | if (numfds < 0) | |
4616 | { | |
4617 | if (errno == EINTR) | |
4618 | continue; | |
4619 | else | |
4620 | perror_with_name ("interruptible_select"); | |
4621 | } | |
4622 | } | |
4623 | } | |
4624 | ||
372316f1 PA |
4625 | /* Generate a wrapper for target_stopped_by_REASON that works on PTID |
4626 | instead of the current thread. */ | |
4627 | #define THREAD_STOPPED_BY(REASON) \ | |
4628 | static int \ | |
4629 | thread_stopped_by_ ## REASON (ptid_t ptid) \ | |
4630 | { \ | |
2989a365 | 4631 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); \ |
372316f1 PA |
4632 | inferior_ptid = ptid; \ |
4633 | \ | |
2989a365 | 4634 | return target_stopped_by_ ## REASON (); \ |
372316f1 PA |
4635 | } |
4636 | ||
4637 | /* Generate thread_stopped_by_watchpoint. */ | |
4638 | THREAD_STOPPED_BY (watchpoint) | |
4639 | /* Generate thread_stopped_by_sw_breakpoint. */ | |
4640 | THREAD_STOPPED_BY (sw_breakpoint) | |
4641 | /* Generate thread_stopped_by_hw_breakpoint. */ | |
4642 | THREAD_STOPPED_BY (hw_breakpoint) | |
4643 | ||
372316f1 PA |
4644 | /* Save the thread's event and stop reason to process it later. */ |
4645 | ||
4646 | static void | |
5b6d1e4f | 4647 | save_waitstatus (struct thread_info *tp, const target_waitstatus *ws) |
372316f1 | 4648 | { |
372316f1 PA |
4649 | if (debug_infrun) |
4650 | { | |
23fdd69e | 4651 | std::string statstr = target_waitstatus_to_string (ws); |
372316f1 | 4652 | |
372316f1 PA |
4653 | fprintf_unfiltered (gdb_stdlog, |
4654 | "infrun: saving status %s for %d.%ld.%ld\n", | |
23fdd69e | 4655 | statstr.c_str (), |
e99b03dc | 4656 | tp->ptid.pid (), |
e38504b3 | 4657 | tp->ptid.lwp (), |
cc6bcb54 | 4658 | tp->ptid.tid ()); |
372316f1 PA |
4659 | } |
4660 | ||
4661 | /* Record for later. */ | |
4662 | tp->suspend.waitstatus = *ws; | |
4663 | tp->suspend.waitstatus_pending_p = 1; | |
4664 | ||
00431a78 | 4665 | struct regcache *regcache = get_thread_regcache (tp); |
8b86c959 | 4666 | const address_space *aspace = regcache->aspace (); |
372316f1 PA |
4667 | |
4668 | if (ws->kind == TARGET_WAITKIND_STOPPED | |
4669 | && ws->value.sig == GDB_SIGNAL_TRAP) | |
4670 | { | |
4671 | CORE_ADDR pc = regcache_read_pc (regcache); | |
4672 | ||
4673 | adjust_pc_after_break (tp, &tp->suspend.waitstatus); | |
4674 | ||
4675 | if (thread_stopped_by_watchpoint (tp->ptid)) | |
4676 | { | |
4677 | tp->suspend.stop_reason | |
4678 | = TARGET_STOPPED_BY_WATCHPOINT; | |
4679 | } | |
4680 | else if (target_supports_stopped_by_sw_breakpoint () | |
4681 | && thread_stopped_by_sw_breakpoint (tp->ptid)) | |
4682 | { | |
4683 | tp->suspend.stop_reason | |
4684 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4685 | } | |
4686 | else if (target_supports_stopped_by_hw_breakpoint () | |
4687 | && thread_stopped_by_hw_breakpoint (tp->ptid)) | |
4688 | { | |
4689 | tp->suspend.stop_reason | |
4690 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4691 | } | |
4692 | else if (!target_supports_stopped_by_hw_breakpoint () | |
4693 | && hardware_breakpoint_inserted_here_p (aspace, | |
4694 | pc)) | |
4695 | { | |
4696 | tp->suspend.stop_reason | |
4697 | = TARGET_STOPPED_BY_HW_BREAKPOINT; | |
4698 | } | |
4699 | else if (!target_supports_stopped_by_sw_breakpoint () | |
4700 | && software_breakpoint_inserted_here_p (aspace, | |
4701 | pc)) | |
4702 | { | |
4703 | tp->suspend.stop_reason | |
4704 | = TARGET_STOPPED_BY_SW_BREAKPOINT; | |
4705 | } | |
4706 | else if (!thread_has_single_step_breakpoints_set (tp) | |
4707 | && currently_stepping (tp)) | |
4708 | { | |
4709 | tp->suspend.stop_reason | |
4710 | = TARGET_STOPPED_BY_SINGLE_STEP; | |
4711 | } | |
4712 | } | |
4713 | } | |
4714 | ||
6efcd9a8 | 4715 | /* See infrun.h. */ |
372316f1 | 4716 | |
6efcd9a8 | 4717 | void |
372316f1 PA |
4718 | stop_all_threads (void) |
4719 | { | |
4720 | /* We may need multiple passes to discover all threads. */ | |
4721 | int pass; | |
4722 | int iterations = 0; | |
372316f1 | 4723 | |
53cccef1 | 4724 | gdb_assert (exists_non_stop_target ()); |
372316f1 PA |
4725 | |
4726 | if (debug_infrun) | |
4727 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads\n"); | |
4728 | ||
00431a78 | 4729 | scoped_restore_current_thread restore_thread; |
372316f1 | 4730 | |
65706a29 | 4731 | target_thread_events (1); |
9885e6bb | 4732 | SCOPE_EXIT { target_thread_events (0); }; |
65706a29 | 4733 | |
372316f1 PA |
4734 | /* Request threads to stop, and then wait for the stops. Because |
4735 | threads we already know about can spawn more threads while we're | |
4736 | trying to stop them, and we only learn about new threads when we | |
4737 | update the thread list, do this in a loop, and keep iterating | |
4738 | until two passes find no threads that need to be stopped. */ | |
4739 | for (pass = 0; pass < 2; pass++, iterations++) | |
4740 | { | |
4741 | if (debug_infrun) | |
4742 | fprintf_unfiltered (gdb_stdlog, | |
4743 | "infrun: stop_all_threads, pass=%d, " | |
4744 | "iterations=%d\n", pass, iterations); | |
4745 | while (1) | |
4746 | { | |
372316f1 | 4747 | int need_wait = 0; |
372316f1 PA |
4748 | |
4749 | update_thread_list (); | |
4750 | ||
4751 | /* Go through all threads looking for threads that we need | |
4752 | to tell the target to stop. */ | |
08036331 | 4753 | for (thread_info *t : all_non_exited_threads ()) |
372316f1 | 4754 | { |
53cccef1 TBA |
4755 | /* For a single-target setting with an all-stop target, |
4756 | we would not even arrive here. For a multi-target | |
4757 | setting, until GDB is able to handle a mixture of | |
4758 | all-stop and non-stop targets, simply skip all-stop | |
4759 | targets' threads. This should be fine due to the | |
4760 | protection of 'check_multi_target_resumption'. */ | |
4761 | ||
4762 | switch_to_thread_no_regs (t); | |
4763 | if (!target_is_non_stop_p ()) | |
4764 | continue; | |
4765 | ||
372316f1 PA |
4766 | if (t->executing) |
4767 | { | |
4768 | /* If already stopping, don't request a stop again. | |
4769 | We just haven't seen the notification yet. */ | |
4770 | if (!t->stop_requested) | |
4771 | { | |
4772 | if (debug_infrun) | |
4773 | fprintf_unfiltered (gdb_stdlog, | |
4774 | "infrun: %s executing, " | |
4775 | "need stop\n", | |
a068643d | 4776 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4777 | target_stop (t->ptid); |
4778 | t->stop_requested = 1; | |
4779 | } | |
4780 | else | |
4781 | { | |
4782 | if (debug_infrun) | |
4783 | fprintf_unfiltered (gdb_stdlog, | |
4784 | "infrun: %s executing, " | |
4785 | "already stopping\n", | |
a068643d | 4786 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4787 | } |
4788 | ||
4789 | if (t->stop_requested) | |
4790 | need_wait = 1; | |
4791 | } | |
4792 | else | |
4793 | { | |
4794 | if (debug_infrun) | |
4795 | fprintf_unfiltered (gdb_stdlog, | |
4796 | "infrun: %s not executing\n", | |
a068643d | 4797 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4798 | |
4799 | /* The thread may be not executing, but still be | |
4800 | resumed with a pending status to process. */ | |
719546c4 | 4801 | t->resumed = false; |
372316f1 PA |
4802 | } |
4803 | } | |
4804 | ||
4805 | if (!need_wait) | |
4806 | break; | |
4807 | ||
4808 | /* If we find new threads on the second iteration, restart | |
4809 | over. We want to see two iterations in a row with all | |
4810 | threads stopped. */ | |
4811 | if (pass > 0) | |
4812 | pass = -1; | |
4813 | ||
5b6d1e4f PA |
4814 | wait_one_event event = wait_one (); |
4815 | ||
c29705b7 | 4816 | if (debug_infrun) |
372316f1 | 4817 | { |
c29705b7 PW |
4818 | fprintf_unfiltered (gdb_stdlog, |
4819 | "infrun: stop_all_threads %s %s\n", | |
5b6d1e4f PA |
4820 | target_waitstatus_to_string (&event.ws).c_str (), |
4821 | target_pid_to_str (event.ptid).c_str ()); | |
372316f1 | 4822 | } |
372316f1 | 4823 | |
5b6d1e4f PA |
4824 | if (event.ws.kind == TARGET_WAITKIND_NO_RESUMED |
4825 | || event.ws.kind == TARGET_WAITKIND_THREAD_EXITED | |
4826 | || event.ws.kind == TARGET_WAITKIND_EXITED | |
4827 | || event.ws.kind == TARGET_WAITKIND_SIGNALLED) | |
c29705b7 PW |
4828 | { |
4829 | /* All resumed threads exited | |
4830 | or one thread/process exited/signalled. */ | |
372316f1 PA |
4831 | } |
4832 | else | |
4833 | { | |
5b6d1e4f | 4834 | thread_info *t = find_thread_ptid (event.target, event.ptid); |
372316f1 | 4835 | if (t == NULL) |
5b6d1e4f | 4836 | t = add_thread (event.target, event.ptid); |
372316f1 PA |
4837 | |
4838 | t->stop_requested = 0; | |
4839 | t->executing = 0; | |
719546c4 | 4840 | t->resumed = false; |
372316f1 PA |
4841 | t->control.may_range_step = 0; |
4842 | ||
6efcd9a8 PA |
4843 | /* This may be the first time we see the inferior report |
4844 | a stop. */ | |
5b6d1e4f | 4845 | inferior *inf = find_inferior_ptid (event.target, event.ptid); |
6efcd9a8 PA |
4846 | if (inf->needs_setup) |
4847 | { | |
4848 | switch_to_thread_no_regs (t); | |
4849 | setup_inferior (0); | |
4850 | } | |
4851 | ||
5b6d1e4f PA |
4852 | if (event.ws.kind == TARGET_WAITKIND_STOPPED |
4853 | && event.ws.value.sig == GDB_SIGNAL_0) | |
372316f1 PA |
4854 | { |
4855 | /* We caught the event that we intended to catch, so | |
4856 | there's no event pending. */ | |
4857 | t->suspend.waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
4858 | t->suspend.waitstatus_pending_p = 0; | |
4859 | ||
00431a78 | 4860 | if (displaced_step_fixup (t, GDB_SIGNAL_0) < 0) |
372316f1 PA |
4861 | { |
4862 | /* Add it back to the step-over queue. */ | |
4863 | if (debug_infrun) | |
4864 | { | |
4865 | fprintf_unfiltered (gdb_stdlog, | |
4866 | "infrun: displaced-step of %s " | |
4867 | "canceled: adding back to the " | |
4868 | "step-over queue\n", | |
a068643d | 4869 | target_pid_to_str (t->ptid).c_str ()); |
372316f1 PA |
4870 | } |
4871 | t->control.trap_expected = 0; | |
4872 | thread_step_over_chain_enqueue (t); | |
4873 | } | |
4874 | } | |
4875 | else | |
4876 | { | |
4877 | enum gdb_signal sig; | |
4878 | struct regcache *regcache; | |
372316f1 PA |
4879 | |
4880 | if (debug_infrun) | |
4881 | { | |
5b6d1e4f | 4882 | std::string statstr = target_waitstatus_to_string (&event.ws); |
372316f1 | 4883 | |
372316f1 PA |
4884 | fprintf_unfiltered (gdb_stdlog, |
4885 | "infrun: target_wait %s, saving " | |
4886 | "status for %d.%ld.%ld\n", | |
23fdd69e | 4887 | statstr.c_str (), |
e99b03dc | 4888 | t->ptid.pid (), |
e38504b3 | 4889 | t->ptid.lwp (), |
cc6bcb54 | 4890 | t->ptid.tid ()); |
372316f1 PA |
4891 | } |
4892 | ||
4893 | /* Record for later. */ | |
5b6d1e4f | 4894 | save_waitstatus (t, &event.ws); |
372316f1 | 4895 | |
5b6d1e4f PA |
4896 | sig = (event.ws.kind == TARGET_WAITKIND_STOPPED |
4897 | ? event.ws.value.sig : GDB_SIGNAL_0); | |
372316f1 | 4898 | |
00431a78 | 4899 | if (displaced_step_fixup (t, sig) < 0) |
372316f1 PA |
4900 | { |
4901 | /* Add it back to the step-over queue. */ | |
4902 | t->control.trap_expected = 0; | |
4903 | thread_step_over_chain_enqueue (t); | |
4904 | } | |
4905 | ||
00431a78 | 4906 | regcache = get_thread_regcache (t); |
372316f1 PA |
4907 | t->suspend.stop_pc = regcache_read_pc (regcache); |
4908 | ||
4909 | if (debug_infrun) | |
4910 | { | |
4911 | fprintf_unfiltered (gdb_stdlog, | |
4912 | "infrun: saved stop_pc=%s for %s " | |
4913 | "(currently_stepping=%d)\n", | |
4914 | paddress (target_gdbarch (), | |
4915 | t->suspend.stop_pc), | |
a068643d | 4916 | target_pid_to_str (t->ptid).c_str (), |
372316f1 PA |
4917 | currently_stepping (t)); |
4918 | } | |
4919 | } | |
4920 | } | |
4921 | } | |
4922 | } | |
4923 | ||
372316f1 PA |
4924 | if (debug_infrun) |
4925 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_all_threads done\n"); | |
4926 | } | |
4927 | ||
f4836ba9 PA |
4928 | /* Handle a TARGET_WAITKIND_NO_RESUMED event. */ |
4929 | ||
4930 | static int | |
4931 | handle_no_resumed (struct execution_control_state *ecs) | |
4932 | { | |
3b12939d | 4933 | if (target_can_async_p ()) |
f4836ba9 | 4934 | { |
3b12939d PA |
4935 | struct ui *ui; |
4936 | int any_sync = 0; | |
f4836ba9 | 4937 | |
3b12939d PA |
4938 | ALL_UIS (ui) |
4939 | { | |
4940 | if (ui->prompt_state == PROMPT_BLOCKED) | |
4941 | { | |
4942 | any_sync = 1; | |
4943 | break; | |
4944 | } | |
4945 | } | |
4946 | if (!any_sync) | |
4947 | { | |
4948 | /* There were no unwaited-for children left in the target, but, | |
4949 | we're not synchronously waiting for events either. Just | |
4950 | ignore. */ | |
4951 | ||
4952 | if (debug_infrun) | |
4953 | fprintf_unfiltered (gdb_stdlog, | |
4954 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
4955 | "(ignoring: bg)\n"); | |
4956 | prepare_to_wait (ecs); | |
4957 | return 1; | |
4958 | } | |
f4836ba9 PA |
4959 | } |
4960 | ||
4961 | /* Otherwise, if we were running a synchronous execution command, we | |
4962 | may need to cancel it and give the user back the terminal. | |
4963 | ||
4964 | In non-stop mode, the target can't tell whether we've already | |
4965 | consumed previous stop events, so it can end up sending us a | |
4966 | no-resumed event like so: | |
4967 | ||
4968 | #0 - thread 1 is left stopped | |
4969 | ||
4970 | #1 - thread 2 is resumed and hits breakpoint | |
4971 | -> TARGET_WAITKIND_STOPPED | |
4972 | ||
4973 | #2 - thread 3 is resumed and exits | |
4974 | this is the last resumed thread, so | |
4975 | -> TARGET_WAITKIND_NO_RESUMED | |
4976 | ||
4977 | #3 - gdb processes stop for thread 2 and decides to re-resume | |
4978 | it. | |
4979 | ||
4980 | #4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event. | |
4981 | thread 2 is now resumed, so the event should be ignored. | |
4982 | ||
4983 | IOW, if the stop for thread 2 doesn't end a foreground command, | |
4984 | then we need to ignore the following TARGET_WAITKIND_NO_RESUMED | |
4985 | event. But it could be that the event meant that thread 2 itself | |
4986 | (or whatever other thread was the last resumed thread) exited. | |
4987 | ||
4988 | To address this we refresh the thread list and check whether we | |
4989 | have resumed threads _now_. In the example above, this removes | |
4990 | thread 3 from the thread list. If thread 2 was re-resumed, we | |
4991 | ignore this event. If we find no thread resumed, then we cancel | |
4992 | the synchronous command show "no unwaited-for " to the user. */ | |
4993 | update_thread_list (); | |
4994 | ||
5b6d1e4f | 4995 | for (thread_info *thread : all_non_exited_threads (ecs->target)) |
f4836ba9 PA |
4996 | { |
4997 | if (thread->executing | |
4998 | || thread->suspend.waitstatus_pending_p) | |
4999 | { | |
5000 | /* There were no unwaited-for children left in the target at | |
5001 | some point, but there are now. Just ignore. */ | |
5002 | if (debug_infrun) | |
5003 | fprintf_unfiltered (gdb_stdlog, | |
5004 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
5005 | "(ignoring: found resumed)\n"); | |
5006 | prepare_to_wait (ecs); | |
5007 | return 1; | |
5008 | } | |
5009 | } | |
5010 | ||
5011 | /* Note however that we may find no resumed thread because the whole | |
5012 | process exited meanwhile (thus updating the thread list results | |
5013 | in an empty thread list). In this case we know we'll be getting | |
5014 | a process exit event shortly. */ | |
5b6d1e4f | 5015 | for (inferior *inf : all_non_exited_inferiors (ecs->target)) |
f4836ba9 | 5016 | { |
08036331 | 5017 | thread_info *thread = any_live_thread_of_inferior (inf); |
f4836ba9 PA |
5018 | if (thread == NULL) |
5019 | { | |
5020 | if (debug_infrun) | |
5021 | fprintf_unfiltered (gdb_stdlog, | |
5022 | "infrun: TARGET_WAITKIND_NO_RESUMED " | |
5023 | "(expect process exit)\n"); | |
5024 | prepare_to_wait (ecs); | |
5025 | return 1; | |
5026 | } | |
5027 | } | |
5028 | ||
5029 | /* Go ahead and report the event. */ | |
5030 | return 0; | |
5031 | } | |
5032 | ||
05ba8510 PA |
5033 | /* Given an execution control state that has been freshly filled in by |
5034 | an event from the inferior, figure out what it means and take | |
5035 | appropriate action. | |
5036 | ||
5037 | The alternatives are: | |
5038 | ||
22bcd14b | 5039 | 1) stop_waiting and return; to really stop and return to the |
05ba8510 PA |
5040 | debugger. |
5041 | ||
5042 | 2) keep_going and return; to wait for the next event (set | |
5043 | ecs->event_thread->stepping_over_breakpoint to 1 to single step | |
5044 | once). */ | |
c906108c | 5045 | |
ec9499be | 5046 | static void |
595915c1 | 5047 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 5048 | { |
595915c1 TT |
5049 | /* Make sure that all temporary struct value objects that were |
5050 | created during the handling of the event get deleted at the | |
5051 | end. */ | |
5052 | scoped_value_mark free_values; | |
5053 | ||
d6b48e9c PA |
5054 | enum stop_kind stop_soon; |
5055 | ||
c29705b7 PW |
5056 | if (debug_infrun) |
5057 | fprintf_unfiltered (gdb_stdlog, "infrun: handle_inferior_event %s\n", | |
5058 | target_waitstatus_to_string (&ecs->ws).c_str ()); | |
5059 | ||
28736962 PA |
5060 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
5061 | { | |
5062 | /* We had an event in the inferior, but we are not interested in | |
5063 | handling it at this level. The lower layers have already | |
5064 | done what needs to be done, if anything. | |
5065 | ||
5066 | One of the possible circumstances for this is when the | |
5067 | inferior produces output for the console. The inferior has | |
5068 | not stopped, and we are ignoring the event. Another possible | |
5069 | circumstance is any event which the lower level knows will be | |
5070 | reported multiple times without an intervening resume. */ | |
28736962 PA |
5071 | prepare_to_wait (ecs); |
5072 | return; | |
5073 | } | |
5074 | ||
65706a29 PA |
5075 | if (ecs->ws.kind == TARGET_WAITKIND_THREAD_EXITED) |
5076 | { | |
65706a29 PA |
5077 | prepare_to_wait (ecs); |
5078 | return; | |
5079 | } | |
5080 | ||
0e5bf2a8 | 5081 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
f4836ba9 PA |
5082 | && handle_no_resumed (ecs)) |
5083 | return; | |
0e5bf2a8 | 5084 | |
5b6d1e4f PA |
5085 | /* Cache the last target/ptid/waitstatus. */ |
5086 | set_last_target_status (ecs->target, ecs->ptid, ecs->ws); | |
e02bc4cc | 5087 | |
ca005067 | 5088 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 5089 | stop_stack_dummy = STOP_NONE; |
ca005067 | 5090 | |
0e5bf2a8 PA |
5091 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
5092 | { | |
5093 | /* No unwaited-for children left. IOW, all resumed children | |
5094 | have exited. */ | |
0e5bf2a8 | 5095 | stop_print_frame = 0; |
22bcd14b | 5096 | stop_waiting (ecs); |
0e5bf2a8 PA |
5097 | return; |
5098 | } | |
5099 | ||
8c90c137 | 5100 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
64776a0b | 5101 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) |
359f5fe6 | 5102 | { |
5b6d1e4f | 5103 | ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid); |
359f5fe6 PA |
5104 | /* If it's a new thread, add it to the thread database. */ |
5105 | if (ecs->event_thread == NULL) | |
5b6d1e4f | 5106 | ecs->event_thread = add_thread (ecs->target, ecs->ptid); |
c1e36e3e PA |
5107 | |
5108 | /* Disable range stepping. If the next step request could use a | |
5109 | range, this will be end up re-enabled then. */ | |
5110 | ecs->event_thread->control.may_range_step = 0; | |
359f5fe6 | 5111 | } |
88ed393a JK |
5112 | |
5113 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
d8dd4d5f | 5114 | adjust_pc_after_break (ecs->event_thread, &ecs->ws); |
88ed393a JK |
5115 | |
5116 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
5117 | reinit_frame_cache (); | |
5118 | ||
28736962 PA |
5119 | breakpoint_retire_moribund (); |
5120 | ||
2b009048 DJ |
5121 | /* First, distinguish signals caused by the debugger from signals |
5122 | that have to do with the program's own actions. Note that | |
5123 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
5124 | on the operating system version. Here we detect when a SIGILL or | |
5125 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
5126 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
5127 | when we're trying to execute a breakpoint instruction on a | |
5128 | non-executable stack. This happens for call dummy breakpoints | |
5129 | for architectures like SPARC that place call dummies on the | |
5130 | stack. */ | |
2b009048 | 5131 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
a493e3e2 PA |
5132 | && (ecs->ws.value.sig == GDB_SIGNAL_ILL |
5133 | || ecs->ws.value.sig == GDB_SIGNAL_SEGV | |
5134 | || ecs->ws.value.sig == GDB_SIGNAL_EMT)) | |
2b009048 | 5135 | { |
00431a78 | 5136 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
de0a0249 | 5137 | |
a01bda52 | 5138 | if (breakpoint_inserted_here_p (regcache->aspace (), |
de0a0249 UW |
5139 | regcache_read_pc (regcache))) |
5140 | { | |
5141 | if (debug_infrun) | |
5142 | fprintf_unfiltered (gdb_stdlog, | |
5143 | "infrun: Treating signal as SIGTRAP\n"); | |
a493e3e2 | 5144 | ecs->ws.value.sig = GDB_SIGNAL_TRAP; |
de0a0249 | 5145 | } |
2b009048 DJ |
5146 | } |
5147 | ||
28736962 PA |
5148 | /* Mark the non-executing threads accordingly. In all-stop, all |
5149 | threads of all processes are stopped when we get any event | |
e1316e60 | 5150 | reported. In non-stop mode, only the event thread stops. */ |
372316f1 PA |
5151 | { |
5152 | ptid_t mark_ptid; | |
5153 | ||
fbea99ea | 5154 | if (!target_is_non_stop_p ()) |
372316f1 PA |
5155 | mark_ptid = minus_one_ptid; |
5156 | else if (ecs->ws.kind == TARGET_WAITKIND_SIGNALLED | |
5157 | || ecs->ws.kind == TARGET_WAITKIND_EXITED) | |
5158 | { | |
5159 | /* If we're handling a process exit in non-stop mode, even | |
5160 | though threads haven't been deleted yet, one would think | |
5161 | that there is nothing to do, as threads of the dead process | |
5162 | will be soon deleted, and threads of any other process were | |
5163 | left running. However, on some targets, threads survive a | |
5164 | process exit event. E.g., for the "checkpoint" command, | |
5165 | when the current checkpoint/fork exits, linux-fork.c | |
5166 | automatically switches to another fork from within | |
5167 | target_mourn_inferior, by associating the same | |
5168 | inferior/thread to another fork. We haven't mourned yet at | |
5169 | this point, but we must mark any threads left in the | |
5170 | process as not-executing so that finish_thread_state marks | |
5171 | them stopped (in the user's perspective) if/when we present | |
5172 | the stop to the user. */ | |
e99b03dc | 5173 | mark_ptid = ptid_t (ecs->ptid.pid ()); |
372316f1 PA |
5174 | } |
5175 | else | |
5176 | mark_ptid = ecs->ptid; | |
5177 | ||
719546c4 | 5178 | set_executing (ecs->target, mark_ptid, false); |
372316f1 PA |
5179 | |
5180 | /* Likewise the resumed flag. */ | |
719546c4 | 5181 | set_resumed (ecs->target, mark_ptid, false); |
372316f1 | 5182 | } |
8c90c137 | 5183 | |
488f131b JB |
5184 | switch (ecs->ws.kind) |
5185 | { | |
5186 | case TARGET_WAITKIND_LOADED: | |
00431a78 | 5187 | context_switch (ecs); |
b0f4b84b DJ |
5188 | /* Ignore gracefully during startup of the inferior, as it might |
5189 | be the shell which has just loaded some objects, otherwise | |
5190 | add the symbols for the newly loaded objects. Also ignore at | |
5191 | the beginning of an attach or remote session; we will query | |
5192 | the full list of libraries once the connection is | |
5193 | established. */ | |
4f5d7f63 | 5194 | |
00431a78 | 5195 | stop_soon = get_inferior_stop_soon (ecs); |
c0236d92 | 5196 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 5197 | { |
edcc5120 TT |
5198 | struct regcache *regcache; |
5199 | ||
00431a78 | 5200 | regcache = get_thread_regcache (ecs->event_thread); |
edcc5120 TT |
5201 | |
5202 | handle_solib_event (); | |
5203 | ||
5204 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 5205 | = bpstat_stop_status (regcache->aspace (), |
f2ffa92b PA |
5206 | ecs->event_thread->suspend.stop_pc, |
5207 | ecs->event_thread, &ecs->ws); | |
ab04a2af | 5208 | |
c65d6b55 PA |
5209 | if (handle_stop_requested (ecs)) |
5210 | return; | |
5211 | ||
ce12b012 | 5212 | if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
edcc5120 TT |
5213 | { |
5214 | /* A catchpoint triggered. */ | |
94c57d6a PA |
5215 | process_event_stop_test (ecs); |
5216 | return; | |
edcc5120 | 5217 | } |
488f131b | 5218 | |
b0f4b84b DJ |
5219 | /* If requested, stop when the dynamic linker notifies |
5220 | gdb of events. This allows the user to get control | |
5221 | and place breakpoints in initializer routines for | |
5222 | dynamically loaded objects (among other things). */ | |
a493e3e2 | 5223 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
b0f4b84b DJ |
5224 | if (stop_on_solib_events) |
5225 | { | |
55409f9d DJ |
5226 | /* Make sure we print "Stopped due to solib-event" in |
5227 | normal_stop. */ | |
5228 | stop_print_frame = 1; | |
5229 | ||
22bcd14b | 5230 | stop_waiting (ecs); |
b0f4b84b DJ |
5231 | return; |
5232 | } | |
488f131b | 5233 | } |
b0f4b84b DJ |
5234 | |
5235 | /* If we are skipping through a shell, or through shared library | |
5236 | loading that we aren't interested in, resume the program. If | |
5c09a2c5 | 5237 | we're running the program normally, also resume. */ |
b0f4b84b DJ |
5238 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) |
5239 | { | |
74960c60 VP |
5240 | /* Loading of shared libraries might have changed breakpoint |
5241 | addresses. Make sure new breakpoints are inserted. */ | |
a25a5a45 | 5242 | if (stop_soon == NO_STOP_QUIETLY) |
74960c60 | 5243 | insert_breakpoints (); |
64ce06e4 | 5244 | resume (GDB_SIGNAL_0); |
b0f4b84b DJ |
5245 | prepare_to_wait (ecs); |
5246 | return; | |
5247 | } | |
5248 | ||
5c09a2c5 PA |
5249 | /* But stop if we're attaching or setting up a remote |
5250 | connection. */ | |
5251 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5252 | || stop_soon == STOP_QUIETLY_REMOTE) | |
5253 | { | |
5254 | if (debug_infrun) | |
5255 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
22bcd14b | 5256 | stop_waiting (ecs); |
5c09a2c5 PA |
5257 | return; |
5258 | } | |
5259 | ||
5260 | internal_error (__FILE__, __LINE__, | |
5261 | _("unhandled stop_soon: %d"), (int) stop_soon); | |
c5aa993b | 5262 | |
488f131b | 5263 | case TARGET_WAITKIND_SPURIOUS: |
c65d6b55 PA |
5264 | if (handle_stop_requested (ecs)) |
5265 | return; | |
00431a78 | 5266 | context_switch (ecs); |
64ce06e4 | 5267 | resume (GDB_SIGNAL_0); |
488f131b JB |
5268 | prepare_to_wait (ecs); |
5269 | return; | |
c5aa993b | 5270 | |
65706a29 | 5271 | case TARGET_WAITKIND_THREAD_CREATED: |
c65d6b55 PA |
5272 | if (handle_stop_requested (ecs)) |
5273 | return; | |
00431a78 | 5274 | context_switch (ecs); |
65706a29 PA |
5275 | if (!switch_back_to_stepped_thread (ecs)) |
5276 | keep_going (ecs); | |
5277 | return; | |
5278 | ||
488f131b | 5279 | case TARGET_WAITKIND_EXITED: |
940c3c06 | 5280 | case TARGET_WAITKIND_SIGNALLED: |
fb66883a | 5281 | inferior_ptid = ecs->ptid; |
5b6d1e4f | 5282 | set_current_inferior (find_inferior_ptid (ecs->target, ecs->ptid)); |
6c95b8df PA |
5283 | set_current_program_space (current_inferior ()->pspace); |
5284 | handle_vfork_child_exec_or_exit (0); | |
223ffa71 | 5285 | target_terminal::ours (); /* Must do this before mourn anyway. */ |
488f131b | 5286 | |
0c557179 SDJ |
5287 | /* Clearing any previous state of convenience variables. */ |
5288 | clear_exit_convenience_vars (); | |
5289 | ||
940c3c06 PA |
5290 | if (ecs->ws.kind == TARGET_WAITKIND_EXITED) |
5291 | { | |
5292 | /* Record the exit code in the convenience variable $_exitcode, so | |
5293 | that the user can inspect this again later. */ | |
5294 | set_internalvar_integer (lookup_internalvar ("_exitcode"), | |
5295 | (LONGEST) ecs->ws.value.integer); | |
5296 | ||
5297 | /* Also record this in the inferior itself. */ | |
5298 | current_inferior ()->has_exit_code = 1; | |
5299 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
8cf64490 | 5300 | |
98eb56a4 PA |
5301 | /* Support the --return-child-result option. */ |
5302 | return_child_result_value = ecs->ws.value.integer; | |
5303 | ||
76727919 | 5304 | gdb::observers::exited.notify (ecs->ws.value.integer); |
940c3c06 PA |
5305 | } |
5306 | else | |
0c557179 | 5307 | { |
00431a78 | 5308 | struct gdbarch *gdbarch = current_inferior ()->gdbarch; |
0c557179 SDJ |
5309 | |
5310 | if (gdbarch_gdb_signal_to_target_p (gdbarch)) | |
5311 | { | |
5312 | /* Set the value of the internal variable $_exitsignal, | |
5313 | which holds the signal uncaught by the inferior. */ | |
5314 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
5315 | gdbarch_gdb_signal_to_target (gdbarch, | |
5316 | ecs->ws.value.sig)); | |
5317 | } | |
5318 | else | |
5319 | { | |
5320 | /* We don't have access to the target's method used for | |
5321 | converting between signal numbers (GDB's internal | |
5322 | representation <-> target's representation). | |
5323 | Therefore, we cannot do a good job at displaying this | |
5324 | information to the user. It's better to just warn | |
5325 | her about it (if infrun debugging is enabled), and | |
5326 | give up. */ | |
5327 | if (debug_infrun) | |
5328 | fprintf_filtered (gdb_stdlog, _("\ | |
5329 | Cannot fill $_exitsignal with the correct signal number.\n")); | |
5330 | } | |
5331 | ||
76727919 | 5332 | gdb::observers::signal_exited.notify (ecs->ws.value.sig); |
0c557179 | 5333 | } |
8cf64490 | 5334 | |
488f131b | 5335 | gdb_flush (gdb_stdout); |
bc1e6c81 | 5336 | target_mourn_inferior (inferior_ptid); |
488f131b | 5337 | stop_print_frame = 0; |
22bcd14b | 5338 | stop_waiting (ecs); |
488f131b | 5339 | return; |
c5aa993b | 5340 | |
488f131b | 5341 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 5342 | case TARGET_WAITKIND_VFORKED: |
e2d96639 YQ |
5343 | /* Check whether the inferior is displaced stepping. */ |
5344 | { | |
00431a78 | 5345 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
ac7936df | 5346 | struct gdbarch *gdbarch = regcache->arch (); |
e2d96639 YQ |
5347 | |
5348 | /* If checking displaced stepping is supported, and thread | |
5349 | ecs->ptid is displaced stepping. */ | |
00431a78 | 5350 | if (displaced_step_in_progress_thread (ecs->event_thread)) |
e2d96639 YQ |
5351 | { |
5352 | struct inferior *parent_inf | |
5b6d1e4f | 5353 | = find_inferior_ptid (ecs->target, ecs->ptid); |
e2d96639 YQ |
5354 | struct regcache *child_regcache; |
5355 | CORE_ADDR parent_pc; | |
5356 | ||
d8d83535 SM |
5357 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) |
5358 | { | |
5359 | struct displaced_step_inferior_state *displaced | |
5360 | = get_displaced_stepping_state (parent_inf); | |
5361 | ||
5362 | /* Restore scratch pad for child process. */ | |
5363 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
5364 | } | |
5365 | ||
e2d96639 YQ |
5366 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, |
5367 | indicating that the displaced stepping of syscall instruction | |
5368 | has been done. Perform cleanup for parent process here. Note | |
5369 | that this operation also cleans up the child process for vfork, | |
5370 | because their pages are shared. */ | |
00431a78 | 5371 | displaced_step_fixup (ecs->event_thread, GDB_SIGNAL_TRAP); |
c2829269 PA |
5372 | /* Start a new step-over in another thread if there's one |
5373 | that needs it. */ | |
5374 | start_step_over (); | |
e2d96639 | 5375 | |
e2d96639 YQ |
5376 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, |
5377 | the child's PC is also within the scratchpad. Set the child's PC | |
5378 | to the parent's PC value, which has already been fixed up. | |
5379 | FIXME: we use the parent's aspace here, although we're touching | |
5380 | the child, because the child hasn't been added to the inferior | |
5381 | list yet at this point. */ | |
5382 | ||
5383 | child_regcache | |
5b6d1e4f PA |
5384 | = get_thread_arch_aspace_regcache (parent_inf->process_target (), |
5385 | ecs->ws.value.related_pid, | |
e2d96639 YQ |
5386 | gdbarch, |
5387 | parent_inf->aspace); | |
5388 | /* Read PC value of parent process. */ | |
5389 | parent_pc = regcache_read_pc (regcache); | |
5390 | ||
5391 | if (debug_displaced) | |
5392 | fprintf_unfiltered (gdb_stdlog, | |
5393 | "displaced: write child pc from %s to %s\n", | |
5394 | paddress (gdbarch, | |
5395 | regcache_read_pc (child_regcache)), | |
5396 | paddress (gdbarch, parent_pc)); | |
5397 | ||
5398 | regcache_write_pc (child_regcache, parent_pc); | |
5399 | } | |
5400 | } | |
5401 | ||
00431a78 | 5402 | context_switch (ecs); |
5a2901d9 | 5403 | |
b242c3c2 PA |
5404 | /* Immediately detach breakpoints from the child before there's |
5405 | any chance of letting the user delete breakpoints from the | |
5406 | breakpoint lists. If we don't do this early, it's easy to | |
5407 | leave left over traps in the child, vis: "break foo; catch | |
5408 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
5409 | the fork on the last `continue', and by that time the | |
5410 | breakpoint at "foo" is long gone from the breakpoint table. | |
5411 | If we vforked, then we don't need to unpatch here, since both | |
5412 | parent and child are sharing the same memory pages; we'll | |
5413 | need to unpatch at follow/detach time instead to be certain | |
5414 | that new breakpoints added between catchpoint hit time and | |
5415 | vfork follow are detached. */ | |
5416 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
5417 | { | |
b242c3c2 PA |
5418 | /* This won't actually modify the breakpoint list, but will |
5419 | physically remove the breakpoints from the child. */ | |
d80ee84f | 5420 | detach_breakpoints (ecs->ws.value.related_pid); |
b242c3c2 PA |
5421 | } |
5422 | ||
34b7e8a6 | 5423 | delete_just_stopped_threads_single_step_breakpoints (); |
d03285ec | 5424 | |
e58b0e63 PA |
5425 | /* In case the event is caught by a catchpoint, remember that |
5426 | the event is to be followed at the next resume of the thread, | |
5427 | and not immediately. */ | |
5428 | ecs->event_thread->pending_follow = ecs->ws; | |
5429 | ||
f2ffa92b PA |
5430 | ecs->event_thread->suspend.stop_pc |
5431 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
675bf4cb | 5432 | |
16c381f0 | 5433 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5434 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5435 | ecs->event_thread->suspend.stop_pc, |
5436 | ecs->event_thread, &ecs->ws); | |
675bf4cb | 5437 | |
c65d6b55 PA |
5438 | if (handle_stop_requested (ecs)) |
5439 | return; | |
5440 | ||
ce12b012 PA |
5441 | /* If no catchpoint triggered for this, then keep going. Note |
5442 | that we're interested in knowing the bpstat actually causes a | |
5443 | stop, not just if it may explain the signal. Software | |
5444 | watchpoints, for example, always appear in the bpstat. */ | |
5445 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) | |
04e68871 | 5446 | { |
5ab2fbf1 | 5447 | bool follow_child |
3e43a32a | 5448 | = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 | 5449 | |
a493e3e2 | 5450 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
e58b0e63 | 5451 | |
5b6d1e4f PA |
5452 | process_stratum_target *targ |
5453 | = ecs->event_thread->inf->process_target (); | |
5454 | ||
5ab2fbf1 | 5455 | bool should_resume = follow_fork (); |
e58b0e63 | 5456 | |
5b6d1e4f PA |
5457 | /* Note that one of these may be an invalid pointer, |
5458 | depending on detach_fork. */ | |
00431a78 | 5459 | thread_info *parent = ecs->event_thread; |
5b6d1e4f PA |
5460 | thread_info *child |
5461 | = find_thread_ptid (targ, ecs->ws.value.related_pid); | |
6c95b8df | 5462 | |
a2077e25 PA |
5463 | /* At this point, the parent is marked running, and the |
5464 | child is marked stopped. */ | |
5465 | ||
5466 | /* If not resuming the parent, mark it stopped. */ | |
5467 | if (follow_child && !detach_fork && !non_stop && !sched_multi) | |
00431a78 | 5468 | parent->set_running (false); |
a2077e25 PA |
5469 | |
5470 | /* If resuming the child, mark it running. */ | |
5471 | if (follow_child || (!detach_fork && (non_stop || sched_multi))) | |
00431a78 | 5472 | child->set_running (true); |
a2077e25 | 5473 | |
6c95b8df | 5474 | /* In non-stop mode, also resume the other branch. */ |
fbea99ea PA |
5475 | if (!detach_fork && (non_stop |
5476 | || (sched_multi && target_is_non_stop_p ()))) | |
6c95b8df PA |
5477 | { |
5478 | if (follow_child) | |
5479 | switch_to_thread (parent); | |
5480 | else | |
5481 | switch_to_thread (child); | |
5482 | ||
5483 | ecs->event_thread = inferior_thread (); | |
5484 | ecs->ptid = inferior_ptid; | |
5485 | keep_going (ecs); | |
5486 | } | |
5487 | ||
5488 | if (follow_child) | |
5489 | switch_to_thread (child); | |
5490 | else | |
5491 | switch_to_thread (parent); | |
5492 | ||
e58b0e63 PA |
5493 | ecs->event_thread = inferior_thread (); |
5494 | ecs->ptid = inferior_ptid; | |
5495 | ||
5496 | if (should_resume) | |
5497 | keep_going (ecs); | |
5498 | else | |
22bcd14b | 5499 | stop_waiting (ecs); |
04e68871 DJ |
5500 | return; |
5501 | } | |
94c57d6a PA |
5502 | process_event_stop_test (ecs); |
5503 | return; | |
488f131b | 5504 | |
6c95b8df PA |
5505 | case TARGET_WAITKIND_VFORK_DONE: |
5506 | /* Done with the shared memory region. Re-insert breakpoints in | |
5507 | the parent, and keep going. */ | |
5508 | ||
00431a78 | 5509 | context_switch (ecs); |
6c95b8df PA |
5510 | |
5511 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 5512 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
c65d6b55 PA |
5513 | |
5514 | if (handle_stop_requested (ecs)) | |
5515 | return; | |
5516 | ||
6c95b8df PA |
5517 | /* This also takes care of reinserting breakpoints in the |
5518 | previously locked inferior. */ | |
5519 | keep_going (ecs); | |
5520 | return; | |
5521 | ||
488f131b | 5522 | case TARGET_WAITKIND_EXECD: |
488f131b | 5523 | |
cbd2b4e3 PA |
5524 | /* Note we can't read registers yet (the stop_pc), because we |
5525 | don't yet know the inferior's post-exec architecture. | |
5526 | 'stop_pc' is explicitly read below instead. */ | |
00431a78 | 5527 | switch_to_thread_no_regs (ecs->event_thread); |
5a2901d9 | 5528 | |
6c95b8df PA |
5529 | /* Do whatever is necessary to the parent branch of the vfork. */ |
5530 | handle_vfork_child_exec_or_exit (1); | |
5531 | ||
795e548f PA |
5532 | /* This causes the eventpoints and symbol table to be reset. |
5533 | Must do this now, before trying to determine whether to | |
5534 | stop. */ | |
71b43ef8 | 5535 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 5536 | |
17d8546e DB |
5537 | /* In follow_exec we may have deleted the original thread and |
5538 | created a new one. Make sure that the event thread is the | |
5539 | execd thread for that case (this is a nop otherwise). */ | |
5540 | ecs->event_thread = inferior_thread (); | |
5541 | ||
f2ffa92b PA |
5542 | ecs->event_thread->suspend.stop_pc |
5543 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
ecdc3a72 | 5544 | |
16c381f0 | 5545 | ecs->event_thread->control.stop_bpstat |
a01bda52 | 5546 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
5547 | ecs->event_thread->suspend.stop_pc, |
5548 | ecs->event_thread, &ecs->ws); | |
795e548f | 5549 | |
71b43ef8 PA |
5550 | /* Note that this may be referenced from inside |
5551 | bpstat_stop_status above, through inferior_has_execd. */ | |
5552 | xfree (ecs->ws.value.execd_pathname); | |
5553 | ecs->ws.value.execd_pathname = NULL; | |
5554 | ||
c65d6b55 PA |
5555 | if (handle_stop_requested (ecs)) |
5556 | return; | |
5557 | ||
04e68871 | 5558 | /* If no catchpoint triggered for this, then keep going. */ |
ce12b012 | 5559 | if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat)) |
04e68871 | 5560 | { |
a493e3e2 | 5561 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
04e68871 DJ |
5562 | keep_going (ecs); |
5563 | return; | |
5564 | } | |
94c57d6a PA |
5565 | process_event_stop_test (ecs); |
5566 | return; | |
488f131b | 5567 | |
b4dc5ffa MK |
5568 | /* Be careful not to try to gather much state about a thread |
5569 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 5570 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
1777feb0 | 5571 | /* Getting the current syscall number. */ |
94c57d6a PA |
5572 | if (handle_syscall_event (ecs) == 0) |
5573 | process_event_stop_test (ecs); | |
5574 | return; | |
c906108c | 5575 | |
488f131b JB |
5576 | /* Before examining the threads further, step this thread to |
5577 | get it entirely out of the syscall. (We get notice of the | |
5578 | event when the thread is just on the verge of exiting a | |
5579 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 5580 | into user code.) */ |
488f131b | 5581 | case TARGET_WAITKIND_SYSCALL_RETURN: |
94c57d6a PA |
5582 | if (handle_syscall_event (ecs) == 0) |
5583 | process_event_stop_test (ecs); | |
5584 | return; | |
c906108c | 5585 | |
488f131b | 5586 | case TARGET_WAITKIND_STOPPED: |
4f5d7f63 PA |
5587 | handle_signal_stop (ecs); |
5588 | return; | |
c906108c | 5589 | |
b2175913 MS |
5590 | case TARGET_WAITKIND_NO_HISTORY: |
5591 | /* Reverse execution: target ran out of history info. */ | |
eab402df | 5592 | |
d1988021 | 5593 | /* Switch to the stopped thread. */ |
00431a78 | 5594 | context_switch (ecs); |
d1988021 MM |
5595 | if (debug_infrun) |
5596 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); | |
5597 | ||
34b7e8a6 | 5598 | delete_just_stopped_threads_single_step_breakpoints (); |
f2ffa92b PA |
5599 | ecs->event_thread->suspend.stop_pc |
5600 | = regcache_read_pc (get_thread_regcache (inferior_thread ())); | |
c65d6b55 PA |
5601 | |
5602 | if (handle_stop_requested (ecs)) | |
5603 | return; | |
5604 | ||
76727919 | 5605 | gdb::observers::no_history.notify (); |
22bcd14b | 5606 | stop_waiting (ecs); |
b2175913 | 5607 | return; |
488f131b | 5608 | } |
4f5d7f63 PA |
5609 | } |
5610 | ||
372316f1 PA |
5611 | /* Restart threads back to what they were trying to do back when we |
5612 | paused them for an in-line step-over. The EVENT_THREAD thread is | |
5613 | ignored. */ | |
4d9d9d04 PA |
5614 | |
5615 | static void | |
372316f1 PA |
5616 | restart_threads (struct thread_info *event_thread) |
5617 | { | |
372316f1 PA |
5618 | /* In case the instruction just stepped spawned a new thread. */ |
5619 | update_thread_list (); | |
5620 | ||
08036331 | 5621 | for (thread_info *tp : all_non_exited_threads ()) |
372316f1 | 5622 | { |
f3f8ece4 PA |
5623 | switch_to_thread_no_regs (tp); |
5624 | ||
372316f1 PA |
5625 | if (tp == event_thread) |
5626 | { | |
5627 | if (debug_infrun) | |
5628 | fprintf_unfiltered (gdb_stdlog, | |
5629 | "infrun: restart threads: " | |
5630 | "[%s] is event thread\n", | |
a068643d | 5631 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5632 | continue; |
5633 | } | |
5634 | ||
5635 | if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall)) | |
5636 | { | |
5637 | if (debug_infrun) | |
5638 | fprintf_unfiltered (gdb_stdlog, | |
5639 | "infrun: restart threads: " | |
5640 | "[%s] not meant to be running\n", | |
a068643d | 5641 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5642 | continue; |
5643 | } | |
5644 | ||
5645 | if (tp->resumed) | |
5646 | { | |
5647 | if (debug_infrun) | |
5648 | fprintf_unfiltered (gdb_stdlog, | |
5649 | "infrun: restart threads: [%s] resumed\n", | |
a068643d | 5650 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5651 | gdb_assert (tp->executing || tp->suspend.waitstatus_pending_p); |
5652 | continue; | |
5653 | } | |
5654 | ||
5655 | if (thread_is_in_step_over_chain (tp)) | |
5656 | { | |
5657 | if (debug_infrun) | |
5658 | fprintf_unfiltered (gdb_stdlog, | |
5659 | "infrun: restart threads: " | |
5660 | "[%s] needs step-over\n", | |
a068643d | 5661 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5662 | gdb_assert (!tp->resumed); |
5663 | continue; | |
5664 | } | |
5665 | ||
5666 | ||
5667 | if (tp->suspend.waitstatus_pending_p) | |
5668 | { | |
5669 | if (debug_infrun) | |
5670 | fprintf_unfiltered (gdb_stdlog, | |
5671 | "infrun: restart threads: " | |
5672 | "[%s] has pending status\n", | |
a068643d | 5673 | target_pid_to_str (tp->ptid).c_str ()); |
719546c4 | 5674 | tp->resumed = true; |
372316f1 PA |
5675 | continue; |
5676 | } | |
5677 | ||
c65d6b55 PA |
5678 | gdb_assert (!tp->stop_requested); |
5679 | ||
372316f1 PA |
5680 | /* If some thread needs to start a step-over at this point, it |
5681 | should still be in the step-over queue, and thus skipped | |
5682 | above. */ | |
5683 | if (thread_still_needs_step_over (tp)) | |
5684 | { | |
5685 | internal_error (__FILE__, __LINE__, | |
5686 | "thread [%s] needs a step-over, but not in " | |
5687 | "step-over queue\n", | |
a068643d | 5688 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5689 | } |
5690 | ||
5691 | if (currently_stepping (tp)) | |
5692 | { | |
5693 | if (debug_infrun) | |
5694 | fprintf_unfiltered (gdb_stdlog, | |
5695 | "infrun: restart threads: [%s] was stepping\n", | |
a068643d | 5696 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
5697 | keep_going_stepped_thread (tp); |
5698 | } | |
5699 | else | |
5700 | { | |
5701 | struct execution_control_state ecss; | |
5702 | struct execution_control_state *ecs = &ecss; | |
5703 | ||
5704 | if (debug_infrun) | |
5705 | fprintf_unfiltered (gdb_stdlog, | |
5706 | "infrun: restart threads: [%s] continuing\n", | |
a068643d | 5707 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 | 5708 | reset_ecs (ecs, tp); |
00431a78 | 5709 | switch_to_thread (tp); |
372316f1 PA |
5710 | keep_going_pass_signal (ecs); |
5711 | } | |
5712 | } | |
5713 | } | |
5714 | ||
5715 | /* Callback for iterate_over_threads. Find a resumed thread that has | |
5716 | a pending waitstatus. */ | |
5717 | ||
5718 | static int | |
5719 | resumed_thread_with_pending_status (struct thread_info *tp, | |
5720 | void *arg) | |
5721 | { | |
5722 | return (tp->resumed | |
5723 | && tp->suspend.waitstatus_pending_p); | |
5724 | } | |
5725 | ||
5726 | /* Called when we get an event that may finish an in-line or | |
5727 | out-of-line (displaced stepping) step-over started previously. | |
5728 | Return true if the event is processed and we should go back to the | |
5729 | event loop; false if the caller should continue processing the | |
5730 | event. */ | |
5731 | ||
5732 | static int | |
4d9d9d04 PA |
5733 | finish_step_over (struct execution_control_state *ecs) |
5734 | { | |
372316f1 PA |
5735 | int had_step_over_info; |
5736 | ||
00431a78 | 5737 | displaced_step_fixup (ecs->event_thread, |
4d9d9d04 PA |
5738 | ecs->event_thread->suspend.stop_signal); |
5739 | ||
372316f1 PA |
5740 | had_step_over_info = step_over_info_valid_p (); |
5741 | ||
5742 | if (had_step_over_info) | |
4d9d9d04 PA |
5743 | { |
5744 | /* If we're stepping over a breakpoint with all threads locked, | |
5745 | then only the thread that was stepped should be reporting | |
5746 | back an event. */ | |
5747 | gdb_assert (ecs->event_thread->control.trap_expected); | |
5748 | ||
c65d6b55 | 5749 | clear_step_over_info (); |
4d9d9d04 PA |
5750 | } |
5751 | ||
fbea99ea | 5752 | if (!target_is_non_stop_p ()) |
372316f1 | 5753 | return 0; |
4d9d9d04 PA |
5754 | |
5755 | /* Start a new step-over in another thread if there's one that | |
5756 | needs it. */ | |
5757 | start_step_over (); | |
372316f1 PA |
5758 | |
5759 | /* If we were stepping over a breakpoint before, and haven't started | |
5760 | a new in-line step-over sequence, then restart all other threads | |
5761 | (except the event thread). We can't do this in all-stop, as then | |
5762 | e.g., we wouldn't be able to issue any other remote packet until | |
5763 | these other threads stop. */ | |
5764 | if (had_step_over_info && !step_over_info_valid_p ()) | |
5765 | { | |
5766 | struct thread_info *pending; | |
5767 | ||
5768 | /* If we only have threads with pending statuses, the restart | |
5769 | below won't restart any thread and so nothing re-inserts the | |
5770 | breakpoint we just stepped over. But we need it inserted | |
5771 | when we later process the pending events, otherwise if | |
5772 | another thread has a pending event for this breakpoint too, | |
5773 | we'd discard its event (because the breakpoint that | |
5774 | originally caused the event was no longer inserted). */ | |
00431a78 | 5775 | context_switch (ecs); |
372316f1 PA |
5776 | insert_breakpoints (); |
5777 | ||
5778 | restart_threads (ecs->event_thread); | |
5779 | ||
5780 | /* If we have events pending, go through handle_inferior_event | |
5781 | again, picking up a pending event at random. This avoids | |
5782 | thread starvation. */ | |
5783 | ||
5784 | /* But not if we just stepped over a watchpoint in order to let | |
5785 | the instruction execute so we can evaluate its expression. | |
5786 | The set of watchpoints that triggered is recorded in the | |
5787 | breakpoint objects themselves (see bp->watchpoint_triggered). | |
5788 | If we processed another event first, that other event could | |
5789 | clobber this info. */ | |
5790 | if (ecs->event_thread->stepping_over_watchpoint) | |
5791 | return 0; | |
5792 | ||
5793 | pending = iterate_over_threads (resumed_thread_with_pending_status, | |
5794 | NULL); | |
5795 | if (pending != NULL) | |
5796 | { | |
5797 | struct thread_info *tp = ecs->event_thread; | |
5798 | struct regcache *regcache; | |
5799 | ||
5800 | if (debug_infrun) | |
5801 | { | |
5802 | fprintf_unfiltered (gdb_stdlog, | |
5803 | "infrun: found resumed threads with " | |
5804 | "pending events, saving status\n"); | |
5805 | } | |
5806 | ||
5807 | gdb_assert (pending != tp); | |
5808 | ||
5809 | /* Record the event thread's event for later. */ | |
5810 | save_waitstatus (tp, &ecs->ws); | |
5811 | /* This was cleared early, by handle_inferior_event. Set it | |
5812 | so this pending event is considered by | |
5813 | do_target_wait. */ | |
719546c4 | 5814 | tp->resumed = true; |
372316f1 PA |
5815 | |
5816 | gdb_assert (!tp->executing); | |
5817 | ||
00431a78 | 5818 | regcache = get_thread_regcache (tp); |
372316f1 PA |
5819 | tp->suspend.stop_pc = regcache_read_pc (regcache); |
5820 | ||
5821 | if (debug_infrun) | |
5822 | { | |
5823 | fprintf_unfiltered (gdb_stdlog, | |
5824 | "infrun: saved stop_pc=%s for %s " | |
5825 | "(currently_stepping=%d)\n", | |
5826 | paddress (target_gdbarch (), | |
5827 | tp->suspend.stop_pc), | |
a068643d | 5828 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
5829 | currently_stepping (tp)); |
5830 | } | |
5831 | ||
5832 | /* This in-line step-over finished; clear this so we won't | |
5833 | start a new one. This is what handle_signal_stop would | |
5834 | do, if we returned false. */ | |
5835 | tp->stepping_over_breakpoint = 0; | |
5836 | ||
5837 | /* Wake up the event loop again. */ | |
5838 | mark_async_event_handler (infrun_async_inferior_event_token); | |
5839 | ||
5840 | prepare_to_wait (ecs); | |
5841 | return 1; | |
5842 | } | |
5843 | } | |
5844 | ||
5845 | return 0; | |
4d9d9d04 PA |
5846 | } |
5847 | ||
4f5d7f63 PA |
5848 | /* Come here when the program has stopped with a signal. */ |
5849 | ||
5850 | static void | |
5851 | handle_signal_stop (struct execution_control_state *ecs) | |
5852 | { | |
5853 | struct frame_info *frame; | |
5854 | struct gdbarch *gdbarch; | |
5855 | int stopped_by_watchpoint; | |
5856 | enum stop_kind stop_soon; | |
5857 | int random_signal; | |
c906108c | 5858 | |
f0407826 DE |
5859 | gdb_assert (ecs->ws.kind == TARGET_WAITKIND_STOPPED); |
5860 | ||
c65d6b55 PA |
5861 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
5862 | ||
f0407826 DE |
5863 | /* Do we need to clean up the state of a thread that has |
5864 | completed a displaced single-step? (Doing so usually affects | |
5865 | the PC, so do it here, before we set stop_pc.) */ | |
372316f1 PA |
5866 | if (finish_step_over (ecs)) |
5867 | return; | |
f0407826 DE |
5868 | |
5869 | /* If we either finished a single-step or hit a breakpoint, but | |
5870 | the user wanted this thread to be stopped, pretend we got a | |
5871 | SIG0 (generic unsignaled stop). */ | |
5872 | if (ecs->event_thread->stop_requested | |
5873 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
5874 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
237fc4c9 | 5875 | |
f2ffa92b PA |
5876 | ecs->event_thread->suspend.stop_pc |
5877 | = regcache_read_pc (get_thread_regcache (ecs->event_thread)); | |
488f131b | 5878 | |
527159b7 | 5879 | if (debug_infrun) |
237fc4c9 | 5880 | { |
00431a78 | 5881 | struct regcache *regcache = get_thread_regcache (ecs->event_thread); |
b926417a | 5882 | struct gdbarch *reg_gdbarch = regcache->arch (); |
7f82dfc7 | 5883 | |
f3f8ece4 | 5884 | switch_to_thread (ecs->event_thread); |
5af949e3 UW |
5885 | |
5886 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
b926417a | 5887 | paddress (reg_gdbarch, |
f2ffa92b | 5888 | ecs->event_thread->suspend.stop_pc)); |
d92524f1 | 5889 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
5890 | { |
5891 | CORE_ADDR addr; | |
abbb1732 | 5892 | |
237fc4c9 PA |
5893 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
5894 | ||
8b88a78e | 5895 | if (target_stopped_data_address (current_top_target (), &addr)) |
237fc4c9 | 5896 | fprintf_unfiltered (gdb_stdlog, |
5af949e3 | 5897 | "infrun: stopped data address = %s\n", |
b926417a | 5898 | paddress (reg_gdbarch, addr)); |
237fc4c9 PA |
5899 | else |
5900 | fprintf_unfiltered (gdb_stdlog, | |
5901 | "infrun: (no data address available)\n"); | |
5902 | } | |
5903 | } | |
527159b7 | 5904 | |
36fa8042 PA |
5905 | /* This is originated from start_remote(), start_inferior() and |
5906 | shared libraries hook functions. */ | |
00431a78 | 5907 | stop_soon = get_inferior_stop_soon (ecs); |
36fa8042 PA |
5908 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
5909 | { | |
00431a78 | 5910 | context_switch (ecs); |
36fa8042 PA |
5911 | if (debug_infrun) |
5912 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); | |
5913 | stop_print_frame = 1; | |
22bcd14b | 5914 | stop_waiting (ecs); |
36fa8042 PA |
5915 | return; |
5916 | } | |
5917 | ||
36fa8042 PA |
5918 | /* This originates from attach_command(). We need to overwrite |
5919 | the stop_signal here, because some kernels don't ignore a | |
5920 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
5921 | See more comments in inferior.h. On the other hand, if we | |
5922 | get a non-SIGSTOP, report it to the user - assume the backend | |
5923 | will handle the SIGSTOP if it should show up later. | |
5924 | ||
5925 | Also consider that the attach is complete when we see a | |
5926 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
5927 | target extended-remote report it instead of a SIGSTOP | |
5928 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
5929 | signal, so this is no exception. | |
5930 | ||
5931 | Also consider that the attach is complete when we see a | |
5932 | GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
5933 | the target to stop all threads of the inferior, in case the | |
5934 | low level attach operation doesn't stop them implicitly. If | |
5935 | they weren't stopped implicitly, then the stub will report a | |
5936 | GDB_SIGNAL_0, meaning: stopped for no particular reason | |
5937 | other than GDB's request. */ | |
5938 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP | |
5939 | && (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_STOP | |
5940 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
5941 | || ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_0)) | |
5942 | { | |
5943 | stop_print_frame = 1; | |
22bcd14b | 5944 | stop_waiting (ecs); |
36fa8042 PA |
5945 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
5946 | return; | |
5947 | } | |
5948 | ||
488f131b | 5949 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 | 5950 | so, then switch to that thread. */ |
d7e15655 | 5951 | if (ecs->ptid != inferior_ptid) |
488f131b | 5952 | { |
527159b7 | 5953 | if (debug_infrun) |
8a9de0e4 | 5954 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 5955 | |
00431a78 | 5956 | context_switch (ecs); |
c5aa993b | 5957 | |
9a4105ab | 5958 | if (deprecated_context_hook) |
00431a78 | 5959 | deprecated_context_hook (ecs->event_thread->global_num); |
488f131b | 5960 | } |
c906108c | 5961 | |
568d6575 UW |
5962 | /* At this point, get hold of the now-current thread's frame. */ |
5963 | frame = get_current_frame (); | |
5964 | gdbarch = get_frame_arch (frame); | |
5965 | ||
2adfaa28 | 5966 | /* Pull the single step breakpoints out of the target. */ |
af48d08f | 5967 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) |
488f131b | 5968 | { |
af48d08f | 5969 | struct regcache *regcache; |
af48d08f | 5970 | CORE_ADDR pc; |
2adfaa28 | 5971 | |
00431a78 | 5972 | regcache = get_thread_regcache (ecs->event_thread); |
8b86c959 YQ |
5973 | const address_space *aspace = regcache->aspace (); |
5974 | ||
af48d08f | 5975 | pc = regcache_read_pc (regcache); |
34b7e8a6 | 5976 | |
af48d08f PA |
5977 | /* However, before doing so, if this single-step breakpoint was |
5978 | actually for another thread, set this thread up for moving | |
5979 | past it. */ | |
5980 | if (!thread_has_single_step_breakpoint_here (ecs->event_thread, | |
5981 | aspace, pc)) | |
5982 | { | |
5983 | if (single_step_breakpoint_inserted_here_p (aspace, pc)) | |
2adfaa28 PA |
5984 | { |
5985 | if (debug_infrun) | |
5986 | { | |
5987 | fprintf_unfiltered (gdb_stdlog, | |
af48d08f | 5988 | "infrun: [%s] hit another thread's " |
34b7e8a6 | 5989 | "single-step breakpoint\n", |
a068643d | 5990 | target_pid_to_str (ecs->ptid).c_str ()); |
2adfaa28 | 5991 | } |
af48d08f PA |
5992 | ecs->hit_singlestep_breakpoint = 1; |
5993 | } | |
5994 | } | |
5995 | else | |
5996 | { | |
5997 | if (debug_infrun) | |
5998 | { | |
5999 | fprintf_unfiltered (gdb_stdlog, | |
6000 | "infrun: [%s] hit its " | |
6001 | "single-step breakpoint\n", | |
a068643d | 6002 | target_pid_to_str (ecs->ptid).c_str ()); |
2adfaa28 PA |
6003 | } |
6004 | } | |
488f131b | 6005 | } |
af48d08f | 6006 | delete_just_stopped_threads_single_step_breakpoints (); |
c906108c | 6007 | |
963f9c80 PA |
6008 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
6009 | && ecs->event_thread->control.trap_expected | |
6010 | && ecs->event_thread->stepping_over_watchpoint) | |
d983da9c DJ |
6011 | stopped_by_watchpoint = 0; |
6012 | else | |
6013 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
6014 | ||
6015 | /* If necessary, step over this watchpoint. We'll be back to display | |
6016 | it in a moment. */ | |
6017 | if (stopped_by_watchpoint | |
d92524f1 | 6018 | && (target_have_steppable_watchpoint |
568d6575 | 6019 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 6020 | { |
488f131b JB |
6021 | /* At this point, we are stopped at an instruction which has |
6022 | attempted to write to a piece of memory under control of | |
6023 | a watchpoint. The instruction hasn't actually executed | |
6024 | yet. If we were to evaluate the watchpoint expression | |
6025 | now, we would get the old value, and therefore no change | |
6026 | would seem to have occurred. | |
6027 | ||
6028 | In order to make watchpoints work `right', we really need | |
6029 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
6030 | watchpoint expression. We do this by single-stepping the |
6031 | target. | |
6032 | ||
7f89fd65 | 6033 | It may not be necessary to disable the watchpoint to step over |
d983da9c DJ |
6034 | it. For example, the PA can (with some kernel cooperation) |
6035 | single step over a watchpoint without disabling the watchpoint. | |
6036 | ||
6037 | It is far more common to need to disable a watchpoint to step | |
6038 | the inferior over it. If we have non-steppable watchpoints, | |
6039 | we must disable the current watchpoint; it's simplest to | |
963f9c80 PA |
6040 | disable all watchpoints. |
6041 | ||
6042 | Any breakpoint at PC must also be stepped over -- if there's | |
6043 | one, it will have already triggered before the watchpoint | |
6044 | triggered, and we either already reported it to the user, or | |
6045 | it didn't cause a stop and we called keep_going. In either | |
6046 | case, if there was a breakpoint at PC, we must be trying to | |
6047 | step past it. */ | |
6048 | ecs->event_thread->stepping_over_watchpoint = 1; | |
6049 | keep_going (ecs); | |
488f131b JB |
6050 | return; |
6051 | } | |
6052 | ||
4e1c45ea | 6053 | ecs->event_thread->stepping_over_breakpoint = 0; |
963f9c80 | 6054 | ecs->event_thread->stepping_over_watchpoint = 0; |
16c381f0 JK |
6055 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
6056 | ecs->event_thread->control.stop_step = 0; | |
488f131b | 6057 | stop_print_frame = 1; |
488f131b | 6058 | stopped_by_random_signal = 0; |
ddfe970e | 6059 | bpstat stop_chain = NULL; |
488f131b | 6060 | |
edb3359d DJ |
6061 | /* Hide inlined functions starting here, unless we just performed stepi or |
6062 | nexti. After stepi and nexti, always show the innermost frame (not any | |
6063 | inline function call sites). */ | |
16c381f0 | 6064 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f | 6065 | { |
00431a78 PA |
6066 | const address_space *aspace |
6067 | = get_thread_regcache (ecs->event_thread)->aspace (); | |
0574c78f GB |
6068 | |
6069 | /* skip_inline_frames is expensive, so we avoid it if we can | |
6070 | determine that the address is one where functions cannot have | |
6071 | been inlined. This improves performance with inferiors that | |
6072 | load a lot of shared libraries, because the solib event | |
6073 | breakpoint is defined as the address of a function (i.e. not | |
6074 | inline). Note that we have to check the previous PC as well | |
6075 | as the current one to catch cases when we have just | |
6076 | single-stepped off a breakpoint prior to reinstating it. | |
6077 | Note that we're assuming that the code we single-step to is | |
6078 | not inline, but that's not definitive: there's nothing | |
6079 | preventing the event breakpoint function from containing | |
6080 | inlined code, and the single-step ending up there. If the | |
6081 | user had set a breakpoint on that inlined code, the missing | |
6082 | skip_inline_frames call would break things. Fortunately | |
6083 | that's an extremely unlikely scenario. */ | |
f2ffa92b PA |
6084 | if (!pc_at_non_inline_function (aspace, |
6085 | ecs->event_thread->suspend.stop_pc, | |
6086 | &ecs->ws) | |
a210c238 MR |
6087 | && !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
6088 | && ecs->event_thread->control.trap_expected | |
6089 | && pc_at_non_inline_function (aspace, | |
6090 | ecs->event_thread->prev_pc, | |
09ac7c10 | 6091 | &ecs->ws))) |
1c5a993e | 6092 | { |
f2ffa92b PA |
6093 | stop_chain = build_bpstat_chain (aspace, |
6094 | ecs->event_thread->suspend.stop_pc, | |
6095 | &ecs->ws); | |
00431a78 | 6096 | skip_inline_frames (ecs->event_thread, stop_chain); |
1c5a993e MR |
6097 | |
6098 | /* Re-fetch current thread's frame in case that invalidated | |
6099 | the frame cache. */ | |
6100 | frame = get_current_frame (); | |
6101 | gdbarch = get_frame_arch (frame); | |
6102 | } | |
0574c78f | 6103 | } |
edb3359d | 6104 | |
a493e3e2 | 6105 | if (ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP |
16c381f0 | 6106 | && ecs->event_thread->control.trap_expected |
568d6575 | 6107 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 6108 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 6109 | { |
b50d7442 | 6110 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 6111 | also on an instruction that needs to be stepped multiple |
1777feb0 | 6112 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
6113 | with a delay slot. It needs to be stepped twice, once for |
6114 | the instruction and once for the delay slot. */ | |
6115 | int step_through_delay | |
568d6575 | 6116 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 6117 | |
527159b7 | 6118 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 6119 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
6120 | if (ecs->event_thread->control.step_range_end == 0 |
6121 | && step_through_delay) | |
3352ef37 AC |
6122 | { |
6123 | /* The user issued a continue when stopped at a breakpoint. | |
6124 | Set up for another trap and get out of here. */ | |
4e1c45ea | 6125 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6126 | keep_going (ecs); |
6127 | return; | |
6128 | } | |
6129 | else if (step_through_delay) | |
6130 | { | |
6131 | /* The user issued a step when stopped at a breakpoint. | |
6132 | Maybe we should stop, maybe we should not - the delay | |
6133 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
6134 | case, don't decide that here, just set |
6135 | ecs->stepping_over_breakpoint, making sure we | |
6136 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 6137 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
6138 | } |
6139 | } | |
6140 | ||
ab04a2af TT |
6141 | /* See if there is a breakpoint/watchpoint/catchpoint/etc. that |
6142 | handles this event. */ | |
6143 | ecs->event_thread->control.stop_bpstat | |
a01bda52 | 6144 | = bpstat_stop_status (get_current_regcache ()->aspace (), |
f2ffa92b PA |
6145 | ecs->event_thread->suspend.stop_pc, |
6146 | ecs->event_thread, &ecs->ws, stop_chain); | |
db82e815 | 6147 | |
ab04a2af TT |
6148 | /* Following in case break condition called a |
6149 | function. */ | |
6150 | stop_print_frame = 1; | |
73dd234f | 6151 | |
ab04a2af TT |
6152 | /* This is where we handle "moribund" watchpoints. Unlike |
6153 | software breakpoints traps, hardware watchpoint traps are | |
6154 | always distinguishable from random traps. If no high-level | |
6155 | watchpoint is associated with the reported stop data address | |
6156 | anymore, then the bpstat does not explain the signal --- | |
6157 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
6158 | set. */ | |
6159 | ||
6160 | if (debug_infrun | |
6161 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
47591c29 | 6162 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, |
427cd150 | 6163 | GDB_SIGNAL_TRAP) |
ab04a2af TT |
6164 | && stopped_by_watchpoint) |
6165 | fprintf_unfiltered (gdb_stdlog, | |
6166 | "infrun: no user watchpoint explains " | |
6167 | "watchpoint SIGTRAP, ignoring\n"); | |
73dd234f | 6168 | |
bac7d97b | 6169 | /* NOTE: cagney/2003-03-29: These checks for a random signal |
ab04a2af TT |
6170 | at one stage in the past included checks for an inferior |
6171 | function call's call dummy's return breakpoint. The original | |
6172 | comment, that went with the test, read: | |
03cebad2 | 6173 | |
ab04a2af TT |
6174 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
6175 | another signal besides SIGTRAP, so check here as well as | |
6176 | above.'' | |
73dd234f | 6177 | |
ab04a2af TT |
6178 | If someone ever tries to get call dummys on a |
6179 | non-executable stack to work (where the target would stop | |
6180 | with something like a SIGSEGV), then those tests might need | |
6181 | to be re-instated. Given, however, that the tests were only | |
6182 | enabled when momentary breakpoints were not being used, I | |
6183 | suspect that it won't be the case. | |
488f131b | 6184 | |
ab04a2af TT |
6185 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
6186 | be necessary for call dummies on a non-executable stack on | |
6187 | SPARC. */ | |
488f131b | 6188 | |
bac7d97b | 6189 | /* See if the breakpoints module can explain the signal. */ |
47591c29 PA |
6190 | random_signal |
6191 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat, | |
6192 | ecs->event_thread->suspend.stop_signal); | |
bac7d97b | 6193 | |
1cf4d951 PA |
6194 | /* Maybe this was a trap for a software breakpoint that has since |
6195 | been removed. */ | |
6196 | if (random_signal && target_stopped_by_sw_breakpoint ()) | |
6197 | { | |
5133a315 LM |
6198 | if (gdbarch_program_breakpoint_here_p (gdbarch, |
6199 | ecs->event_thread->suspend.stop_pc)) | |
1cf4d951 PA |
6200 | { |
6201 | struct regcache *regcache; | |
6202 | int decr_pc; | |
6203 | ||
6204 | /* Re-adjust PC to what the program would see if GDB was not | |
6205 | debugging it. */ | |
00431a78 | 6206 | regcache = get_thread_regcache (ecs->event_thread); |
527a273a | 6207 | decr_pc = gdbarch_decr_pc_after_break (gdbarch); |
1cf4d951 PA |
6208 | if (decr_pc != 0) |
6209 | { | |
07036511 TT |
6210 | gdb::optional<scoped_restore_tmpl<int>> |
6211 | restore_operation_disable; | |
1cf4d951 PA |
6212 | |
6213 | if (record_full_is_used ()) | |
07036511 TT |
6214 | restore_operation_disable.emplace |
6215 | (record_full_gdb_operation_disable_set ()); | |
1cf4d951 | 6216 | |
f2ffa92b PA |
6217 | regcache_write_pc (regcache, |
6218 | ecs->event_thread->suspend.stop_pc + decr_pc); | |
1cf4d951 PA |
6219 | } |
6220 | } | |
6221 | else | |
6222 | { | |
6223 | /* A delayed software breakpoint event. Ignore the trap. */ | |
6224 | if (debug_infrun) | |
6225 | fprintf_unfiltered (gdb_stdlog, | |
6226 | "infrun: delayed software breakpoint " | |
6227 | "trap, ignoring\n"); | |
6228 | random_signal = 0; | |
6229 | } | |
6230 | } | |
6231 | ||
6232 | /* Maybe this was a trap for a hardware breakpoint/watchpoint that | |
6233 | has since been removed. */ | |
6234 | if (random_signal && target_stopped_by_hw_breakpoint ()) | |
6235 | { | |
6236 | /* A delayed hardware breakpoint event. Ignore the trap. */ | |
6237 | if (debug_infrun) | |
6238 | fprintf_unfiltered (gdb_stdlog, | |
6239 | "infrun: delayed hardware breakpoint/watchpoint " | |
6240 | "trap, ignoring\n"); | |
6241 | random_signal = 0; | |
6242 | } | |
6243 | ||
bac7d97b PA |
6244 | /* If not, perhaps stepping/nexting can. */ |
6245 | if (random_signal) | |
6246 | random_signal = !(ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP | |
6247 | && currently_stepping (ecs->event_thread)); | |
ab04a2af | 6248 | |
2adfaa28 PA |
6249 | /* Perhaps the thread hit a single-step breakpoint of _another_ |
6250 | thread. Single-step breakpoints are transparent to the | |
6251 | breakpoints module. */ | |
6252 | if (random_signal) | |
6253 | random_signal = !ecs->hit_singlestep_breakpoint; | |
6254 | ||
bac7d97b PA |
6255 | /* No? Perhaps we got a moribund watchpoint. */ |
6256 | if (random_signal) | |
6257 | random_signal = !stopped_by_watchpoint; | |
ab04a2af | 6258 | |
c65d6b55 PA |
6259 | /* Always stop if the user explicitly requested this thread to |
6260 | remain stopped. */ | |
6261 | if (ecs->event_thread->stop_requested) | |
6262 | { | |
6263 | random_signal = 1; | |
6264 | if (debug_infrun) | |
6265 | fprintf_unfiltered (gdb_stdlog, "infrun: user-requested stop\n"); | |
6266 | } | |
6267 | ||
488f131b JB |
6268 | /* For the program's own signals, act according to |
6269 | the signal handling tables. */ | |
6270 | ||
ce12b012 | 6271 | if (random_signal) |
488f131b JB |
6272 | { |
6273 | /* Signal not for debugging purposes. */ | |
5b6d1e4f | 6274 | struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid); |
c9737c08 | 6275 | enum gdb_signal stop_signal = ecs->event_thread->suspend.stop_signal; |
488f131b | 6276 | |
527159b7 | 6277 | if (debug_infrun) |
c9737c08 PA |
6278 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal (%s)\n", |
6279 | gdb_signal_to_symbol_string (stop_signal)); | |
527159b7 | 6280 | |
488f131b JB |
6281 | stopped_by_random_signal = 1; |
6282 | ||
252fbfc8 PA |
6283 | /* Always stop on signals if we're either just gaining control |
6284 | of the program, or the user explicitly requested this thread | |
6285 | to remain stopped. */ | |
d6b48e9c | 6286 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 6287 | || ecs->event_thread->stop_requested |
24291992 | 6288 | || (!inf->detaching |
16c381f0 | 6289 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b | 6290 | { |
22bcd14b | 6291 | stop_waiting (ecs); |
488f131b JB |
6292 | return; |
6293 | } | |
b57bacec PA |
6294 | |
6295 | /* Notify observers the signal has "handle print" set. Note we | |
6296 | returned early above if stopping; normal_stop handles the | |
6297 | printing in that case. */ | |
6298 | if (signal_print[ecs->event_thread->suspend.stop_signal]) | |
6299 | { | |
6300 | /* The signal table tells us to print about this signal. */ | |
223ffa71 | 6301 | target_terminal::ours_for_output (); |
76727919 | 6302 | gdb::observers::signal_received.notify (ecs->event_thread->suspend.stop_signal); |
223ffa71 | 6303 | target_terminal::inferior (); |
b57bacec | 6304 | } |
488f131b JB |
6305 | |
6306 | /* Clear the signal if it should not be passed. */ | |
16c381f0 | 6307 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
a493e3e2 | 6308 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; |
488f131b | 6309 | |
f2ffa92b | 6310 | if (ecs->event_thread->prev_pc == ecs->event_thread->suspend.stop_pc |
16c381f0 | 6311 | && ecs->event_thread->control.trap_expected |
8358c15c | 6312 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
6313 | { |
6314 | /* We were just starting a new sequence, attempting to | |
6315 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 6316 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
6317 | of the stepping range so GDB needs to remember to, when |
6318 | the signal handler returns, resume stepping off that | |
6319 | breakpoint. */ | |
6320 | /* To simplify things, "continue" is forced to use the same | |
6321 | code paths as single-step - set a breakpoint at the | |
6322 | signal return address and then, once hit, step off that | |
6323 | breakpoint. */ | |
237fc4c9 PA |
6324 | if (debug_infrun) |
6325 | fprintf_unfiltered (gdb_stdlog, | |
6326 | "infrun: signal arrived while stepping over " | |
6327 | "breakpoint\n"); | |
d3169d93 | 6328 | |
2c03e5be | 6329 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 6330 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6331 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6332 | ecs->event_thread->control.trap_expected = 0; | |
d137e6dc PA |
6333 | |
6334 | /* If we were nexting/stepping some other thread, switch to | |
6335 | it, so that we don't continue it, losing control. */ | |
6336 | if (!switch_back_to_stepped_thread (ecs)) | |
6337 | keep_going (ecs); | |
9d799f85 | 6338 | return; |
68f53502 | 6339 | } |
9d799f85 | 6340 | |
e5f8a7cc | 6341 | if (ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_0 |
f2ffa92b PA |
6342 | && (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6343 | ecs->event_thread) | |
e5f8a7cc | 6344 | || ecs->event_thread->control.step_range_end == 1) |
edb3359d | 6345 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6346 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 6347 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
6348 | { |
6349 | /* The inferior is about to take a signal that will take it | |
6350 | out of the single step range. Set a breakpoint at the | |
6351 | current PC (which is presumably where the signal handler | |
6352 | will eventually return) and then allow the inferior to | |
6353 | run free. | |
6354 | ||
6355 | Note that this is only needed for a signal delivered | |
6356 | while in the single-step range. Nested signals aren't a | |
6357 | problem as they eventually all return. */ | |
237fc4c9 PA |
6358 | if (debug_infrun) |
6359 | fprintf_unfiltered (gdb_stdlog, | |
6360 | "infrun: signal may take us out of " | |
6361 | "single-step range\n"); | |
6362 | ||
372316f1 | 6363 | clear_step_over_info (); |
2c03e5be | 6364 | insert_hp_step_resume_breakpoint_at_frame (frame); |
e5f8a7cc | 6365 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
6366 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
6367 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
6368 | keep_going (ecs); |
6369 | return; | |
d303a6c7 | 6370 | } |
9d799f85 | 6371 | |
85102364 | 6372 | /* Note: step_resume_breakpoint may be non-NULL. This occurs |
9d799f85 AC |
6373 | when either there's a nested signal, or when there's a |
6374 | pending signal enabled just as the signal handler returns | |
6375 | (leaving the inferior at the step-resume-breakpoint without | |
6376 | actually executing it). Either way continue until the | |
6377 | breakpoint is really hit. */ | |
c447ac0b PA |
6378 | |
6379 | if (!switch_back_to_stepped_thread (ecs)) | |
6380 | { | |
6381 | if (debug_infrun) | |
6382 | fprintf_unfiltered (gdb_stdlog, | |
6383 | "infrun: random signal, keep going\n"); | |
6384 | ||
6385 | keep_going (ecs); | |
6386 | } | |
6387 | return; | |
488f131b | 6388 | } |
94c57d6a PA |
6389 | |
6390 | process_event_stop_test (ecs); | |
6391 | } | |
6392 | ||
6393 | /* Come here when we've got some debug event / signal we can explain | |
6394 | (IOW, not a random signal), and test whether it should cause a | |
6395 | stop, or whether we should resume the inferior (transparently). | |
6396 | E.g., could be a breakpoint whose condition evaluates false; we | |
6397 | could be still stepping within the line; etc. */ | |
6398 | ||
6399 | static void | |
6400 | process_event_stop_test (struct execution_control_state *ecs) | |
6401 | { | |
6402 | struct symtab_and_line stop_pc_sal; | |
6403 | struct frame_info *frame; | |
6404 | struct gdbarch *gdbarch; | |
cdaa5b73 PA |
6405 | CORE_ADDR jmp_buf_pc; |
6406 | struct bpstat_what what; | |
94c57d6a | 6407 | |
cdaa5b73 | 6408 | /* Handle cases caused by hitting a breakpoint. */ |
611c83ae | 6409 | |
cdaa5b73 PA |
6410 | frame = get_current_frame (); |
6411 | gdbarch = get_frame_arch (frame); | |
fcf3daef | 6412 | |
cdaa5b73 | 6413 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
611c83ae | 6414 | |
cdaa5b73 PA |
6415 | if (what.call_dummy) |
6416 | { | |
6417 | stop_stack_dummy = what.call_dummy; | |
6418 | } | |
186c406b | 6419 | |
243a9253 PA |
6420 | /* A few breakpoint types have callbacks associated (e.g., |
6421 | bp_jit_event). Run them now. */ | |
6422 | bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat); | |
6423 | ||
cdaa5b73 PA |
6424 | /* If we hit an internal event that triggers symbol changes, the |
6425 | current frame will be invalidated within bpstat_what (e.g., if we | |
6426 | hit an internal solib event). Re-fetch it. */ | |
6427 | frame = get_current_frame (); | |
6428 | gdbarch = get_frame_arch (frame); | |
e2e4d78b | 6429 | |
cdaa5b73 PA |
6430 | switch (what.main_action) |
6431 | { | |
6432 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: | |
6433 | /* If we hit the breakpoint at longjmp while stepping, we | |
6434 | install a momentary breakpoint at the target of the | |
6435 | jmp_buf. */ | |
186c406b | 6436 | |
cdaa5b73 PA |
6437 | if (debug_infrun) |
6438 | fprintf_unfiltered (gdb_stdlog, | |
6439 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
186c406b | 6440 | |
cdaa5b73 | 6441 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 6442 | |
cdaa5b73 PA |
6443 | if (what.is_longjmp) |
6444 | { | |
6445 | struct value *arg_value; | |
6446 | ||
6447 | /* If we set the longjmp breakpoint via a SystemTap probe, | |
6448 | then use it to extract the arguments. The destination PC | |
6449 | is the third argument to the probe. */ | |
6450 | arg_value = probe_safe_evaluate_at_pc (frame, 2); | |
6451 | if (arg_value) | |
8fa0c4f8 AA |
6452 | { |
6453 | jmp_buf_pc = value_as_address (arg_value); | |
6454 | jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc); | |
6455 | } | |
cdaa5b73 PA |
6456 | else if (!gdbarch_get_longjmp_target_p (gdbarch) |
6457 | || !gdbarch_get_longjmp_target (gdbarch, | |
6458 | frame, &jmp_buf_pc)) | |
e2e4d78b | 6459 | { |
cdaa5b73 PA |
6460 | if (debug_infrun) |
6461 | fprintf_unfiltered (gdb_stdlog, | |
6462 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
6463 | "(!gdbarch_get_longjmp_target)\n"); | |
6464 | keep_going (ecs); | |
6465 | return; | |
e2e4d78b | 6466 | } |
e2e4d78b | 6467 | |
cdaa5b73 PA |
6468 | /* Insert a breakpoint at resume address. */ |
6469 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
6470 | } | |
6471 | else | |
6472 | check_exception_resume (ecs, frame); | |
6473 | keep_going (ecs); | |
6474 | return; | |
e81a37f7 | 6475 | |
cdaa5b73 PA |
6476 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
6477 | { | |
6478 | struct frame_info *init_frame; | |
e81a37f7 | 6479 | |
cdaa5b73 | 6480 | /* There are several cases to consider. |
c906108c | 6481 | |
cdaa5b73 PA |
6482 | 1. The initiating frame no longer exists. In this case we |
6483 | must stop, because the exception or longjmp has gone too | |
6484 | far. | |
2c03e5be | 6485 | |
cdaa5b73 PA |
6486 | 2. The initiating frame exists, and is the same as the |
6487 | current frame. We stop, because the exception or longjmp | |
6488 | has been caught. | |
2c03e5be | 6489 | |
cdaa5b73 PA |
6490 | 3. The initiating frame exists and is different from the |
6491 | current frame. This means the exception or longjmp has | |
6492 | been caught beneath the initiating frame, so keep going. | |
c906108c | 6493 | |
cdaa5b73 PA |
6494 | 4. longjmp breakpoint has been placed just to protect |
6495 | against stale dummy frames and user is not interested in | |
6496 | stopping around longjmps. */ | |
c5aa993b | 6497 | |
cdaa5b73 PA |
6498 | if (debug_infrun) |
6499 | fprintf_unfiltered (gdb_stdlog, | |
6500 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
c5aa993b | 6501 | |
cdaa5b73 PA |
6502 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint |
6503 | != NULL); | |
6504 | delete_exception_resume_breakpoint (ecs->event_thread); | |
c5aa993b | 6505 | |
cdaa5b73 PA |
6506 | if (what.is_longjmp) |
6507 | { | |
b67a2c6f | 6508 | check_longjmp_breakpoint_for_call_dummy (ecs->event_thread); |
c5aa993b | 6509 | |
cdaa5b73 | 6510 | if (!frame_id_p (ecs->event_thread->initiating_frame)) |
e5ef252a | 6511 | { |
cdaa5b73 PA |
6512 | /* Case 4. */ |
6513 | keep_going (ecs); | |
6514 | return; | |
e5ef252a | 6515 | } |
cdaa5b73 | 6516 | } |
c5aa993b | 6517 | |
cdaa5b73 | 6518 | init_frame = frame_find_by_id (ecs->event_thread->initiating_frame); |
527159b7 | 6519 | |
cdaa5b73 PA |
6520 | if (init_frame) |
6521 | { | |
6522 | struct frame_id current_id | |
6523 | = get_frame_id (get_current_frame ()); | |
6524 | if (frame_id_eq (current_id, | |
6525 | ecs->event_thread->initiating_frame)) | |
6526 | { | |
6527 | /* Case 2. Fall through. */ | |
6528 | } | |
6529 | else | |
6530 | { | |
6531 | /* Case 3. */ | |
6532 | keep_going (ecs); | |
6533 | return; | |
6534 | } | |
68f53502 | 6535 | } |
488f131b | 6536 | |
cdaa5b73 PA |
6537 | /* For Cases 1 and 2, remove the step-resume breakpoint, if it |
6538 | exists. */ | |
6539 | delete_step_resume_breakpoint (ecs->event_thread); | |
e5ef252a | 6540 | |
bdc36728 | 6541 | end_stepping_range (ecs); |
cdaa5b73 PA |
6542 | } |
6543 | return; | |
e5ef252a | 6544 | |
cdaa5b73 PA |
6545 | case BPSTAT_WHAT_SINGLE: |
6546 | if (debug_infrun) | |
6547 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); | |
6548 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6549 | /* Still need to check other stuff, at least the case where we | |
6550 | are stepping and step out of the right range. */ | |
6551 | break; | |
e5ef252a | 6552 | |
cdaa5b73 PA |
6553 | case BPSTAT_WHAT_STEP_RESUME: |
6554 | if (debug_infrun) | |
6555 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
e5ef252a | 6556 | |
cdaa5b73 PA |
6557 | delete_step_resume_breakpoint (ecs->event_thread); |
6558 | if (ecs->event_thread->control.proceed_to_finish | |
6559 | && execution_direction == EXEC_REVERSE) | |
6560 | { | |
6561 | struct thread_info *tp = ecs->event_thread; | |
6562 | ||
6563 | /* We are finishing a function in reverse, and just hit the | |
6564 | step-resume breakpoint at the start address of the | |
6565 | function, and we're almost there -- just need to back up | |
6566 | by one more single-step, which should take us back to the | |
6567 | function call. */ | |
6568 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
6569 | keep_going (ecs); | |
e5ef252a | 6570 | return; |
cdaa5b73 PA |
6571 | } |
6572 | fill_in_stop_func (gdbarch, ecs); | |
f2ffa92b | 6573 | if (ecs->event_thread->suspend.stop_pc == ecs->stop_func_start |
cdaa5b73 PA |
6574 | && execution_direction == EXEC_REVERSE) |
6575 | { | |
6576 | /* We are stepping over a function call in reverse, and just | |
6577 | hit the step-resume breakpoint at the start address of | |
6578 | the function. Go back to single-stepping, which should | |
6579 | take us back to the function call. */ | |
6580 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6581 | keep_going (ecs); | |
6582 | return; | |
6583 | } | |
6584 | break; | |
e5ef252a | 6585 | |
cdaa5b73 PA |
6586 | case BPSTAT_WHAT_STOP_NOISY: |
6587 | if (debug_infrun) | |
6588 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); | |
6589 | stop_print_frame = 1; | |
e5ef252a | 6590 | |
99619bea PA |
6591 | /* Assume the thread stopped for a breapoint. We'll still check |
6592 | whether a/the breakpoint is there when the thread is next | |
6593 | resumed. */ | |
6594 | ecs->event_thread->stepping_over_breakpoint = 1; | |
e5ef252a | 6595 | |
22bcd14b | 6596 | stop_waiting (ecs); |
cdaa5b73 | 6597 | return; |
e5ef252a | 6598 | |
cdaa5b73 PA |
6599 | case BPSTAT_WHAT_STOP_SILENT: |
6600 | if (debug_infrun) | |
6601 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); | |
6602 | stop_print_frame = 0; | |
e5ef252a | 6603 | |
99619bea PA |
6604 | /* Assume the thread stopped for a breapoint. We'll still check |
6605 | whether a/the breakpoint is there when the thread is next | |
6606 | resumed. */ | |
6607 | ecs->event_thread->stepping_over_breakpoint = 1; | |
22bcd14b | 6608 | stop_waiting (ecs); |
cdaa5b73 PA |
6609 | return; |
6610 | ||
6611 | case BPSTAT_WHAT_HP_STEP_RESUME: | |
6612 | if (debug_infrun) | |
6613 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); | |
6614 | ||
6615 | delete_step_resume_breakpoint (ecs->event_thread); | |
6616 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
6617 | { | |
6618 | /* Back when the step-resume breakpoint was inserted, we | |
6619 | were trying to single-step off a breakpoint. Go back to | |
6620 | doing that. */ | |
6621 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6622 | ecs->event_thread->stepping_over_breakpoint = 1; | |
6623 | keep_going (ecs); | |
6624 | return; | |
e5ef252a | 6625 | } |
cdaa5b73 PA |
6626 | break; |
6627 | ||
6628 | case BPSTAT_WHAT_KEEP_CHECKING: | |
6629 | break; | |
e5ef252a | 6630 | } |
c906108c | 6631 | |
af48d08f PA |
6632 | /* If we stepped a permanent breakpoint and we had a high priority |
6633 | step-resume breakpoint for the address we stepped, but we didn't | |
6634 | hit it, then we must have stepped into the signal handler. The | |
6635 | step-resume was only necessary to catch the case of _not_ | |
6636 | stepping into the handler, so delete it, and fall through to | |
6637 | checking whether the step finished. */ | |
6638 | if (ecs->event_thread->stepped_breakpoint) | |
6639 | { | |
6640 | struct breakpoint *sr_bp | |
6641 | = ecs->event_thread->control.step_resume_breakpoint; | |
6642 | ||
8d707a12 PA |
6643 | if (sr_bp != NULL |
6644 | && sr_bp->loc->permanent | |
af48d08f PA |
6645 | && sr_bp->type == bp_hp_step_resume |
6646 | && sr_bp->loc->address == ecs->event_thread->prev_pc) | |
6647 | { | |
6648 | if (debug_infrun) | |
6649 | fprintf_unfiltered (gdb_stdlog, | |
6650 | "infrun: stepped permanent breakpoint, stopped in " | |
6651 | "handler\n"); | |
6652 | delete_step_resume_breakpoint (ecs->event_thread); | |
6653 | ecs->event_thread->step_after_step_resume_breakpoint = 0; | |
6654 | } | |
6655 | } | |
6656 | ||
cdaa5b73 PA |
6657 | /* We come here if we hit a breakpoint but should not stop for it. |
6658 | Possibly we also were stepping and should stop for that. So fall | |
6659 | through and test for stepping. But, if not stepping, do not | |
6660 | stop. */ | |
c906108c | 6661 | |
a7212384 UW |
6662 | /* In all-stop mode, if we're currently stepping but have stopped in |
6663 | some other thread, we need to switch back to the stepped thread. */ | |
c447ac0b PA |
6664 | if (switch_back_to_stepped_thread (ecs)) |
6665 | return; | |
776f04fa | 6666 | |
8358c15c | 6667 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 6668 | { |
527159b7 | 6669 | if (debug_infrun) |
d3169d93 DJ |
6670 | fprintf_unfiltered (gdb_stdlog, |
6671 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 6672 | |
488f131b JB |
6673 | /* Having a step-resume breakpoint overrides anything |
6674 | else having to do with stepping commands until | |
6675 | that breakpoint is reached. */ | |
488f131b JB |
6676 | keep_going (ecs); |
6677 | return; | |
6678 | } | |
c5aa993b | 6679 | |
16c381f0 | 6680 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 6681 | { |
527159b7 | 6682 | if (debug_infrun) |
8a9de0e4 | 6683 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 6684 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
6685 | keep_going (ecs); |
6686 | return; | |
6687 | } | |
c5aa993b | 6688 | |
4b7703ad JB |
6689 | /* Re-fetch current thread's frame in case the code above caused |
6690 | the frame cache to be re-initialized, making our FRAME variable | |
6691 | a dangling pointer. */ | |
6692 | frame = get_current_frame (); | |
628fe4e4 | 6693 | gdbarch = get_frame_arch (frame); |
7e324e48 | 6694 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 6695 | |
488f131b | 6696 | /* If stepping through a line, keep going if still within it. |
c906108c | 6697 | |
488f131b JB |
6698 | Note that step_range_end is the address of the first instruction |
6699 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
6700 | within it! |
6701 | ||
6702 | Note also that during reverse execution, we may be stepping | |
6703 | through a function epilogue and therefore must detect when | |
6704 | the current-frame changes in the middle of a line. */ | |
6705 | ||
f2ffa92b PA |
6706 | if (pc_in_thread_step_range (ecs->event_thread->suspend.stop_pc, |
6707 | ecs->event_thread) | |
31410e84 | 6708 | && (execution_direction != EXEC_REVERSE |
388a8562 | 6709 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 6710 | ecs->event_thread->control.step_frame_id))) |
488f131b | 6711 | { |
527159b7 | 6712 | if (debug_infrun) |
5af949e3 UW |
6713 | fprintf_unfiltered |
6714 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
6715 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
6716 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 | 6717 | |
c1e36e3e PA |
6718 | /* Tentatively re-enable range stepping; `resume' disables it if |
6719 | necessary (e.g., if we're stepping over a breakpoint or we | |
6720 | have software watchpoints). */ | |
6721 | ecs->event_thread->control.may_range_step = 1; | |
6722 | ||
b2175913 MS |
6723 | /* When stepping backward, stop at beginning of line range |
6724 | (unless it's the function entry point, in which case | |
6725 | keep going back to the call point). */ | |
f2ffa92b | 6726 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
16c381f0 | 6727 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
6728 | && stop_pc != ecs->stop_func_start |
6729 | && execution_direction == EXEC_REVERSE) | |
bdc36728 | 6730 | end_stepping_range (ecs); |
b2175913 MS |
6731 | else |
6732 | keep_going (ecs); | |
6733 | ||
488f131b JB |
6734 | return; |
6735 | } | |
c5aa993b | 6736 | |
488f131b | 6737 | /* We stepped out of the stepping range. */ |
c906108c | 6738 | |
488f131b | 6739 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
6740 | loader dynamic symbol resolution code... |
6741 | ||
6742 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
6743 | time loader code and reach the callee's address. | |
6744 | ||
6745 | EXEC_REVERSE: we've already executed the callee (backward), and | |
6746 | the runtime loader code is handled just like any other | |
6747 | undebuggable function call. Now we need only keep stepping | |
6748 | backward through the trampoline code, and that's handled further | |
6749 | down, so there is nothing for us to do here. */ | |
6750 | ||
6751 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 6752 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
f2ffa92b | 6753 | && in_solib_dynsym_resolve_code (ecs->event_thread->suspend.stop_pc)) |
488f131b | 6754 | { |
4c8c40e6 | 6755 | CORE_ADDR pc_after_resolver = |
f2ffa92b PA |
6756 | gdbarch_skip_solib_resolver (gdbarch, |
6757 | ecs->event_thread->suspend.stop_pc); | |
c906108c | 6758 | |
527159b7 | 6759 | if (debug_infrun) |
3e43a32a MS |
6760 | fprintf_unfiltered (gdb_stdlog, |
6761 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 6762 | |
488f131b JB |
6763 | if (pc_after_resolver) |
6764 | { | |
6765 | /* Set up a step-resume breakpoint at the address | |
6766 | indicated by SKIP_SOLIB_RESOLVER. */ | |
51abb421 | 6767 | symtab_and_line sr_sal; |
488f131b | 6768 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 6769 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 6770 | |
a6d9a66e UW |
6771 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6772 | sr_sal, null_frame_id); | |
c5aa993b | 6773 | } |
c906108c | 6774 | |
488f131b JB |
6775 | keep_going (ecs); |
6776 | return; | |
6777 | } | |
c906108c | 6778 | |
1d509aa6 MM |
6779 | /* Step through an indirect branch thunk. */ |
6780 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE | |
f2ffa92b PA |
6781 | && gdbarch_in_indirect_branch_thunk (gdbarch, |
6782 | ecs->event_thread->suspend.stop_pc)) | |
1d509aa6 MM |
6783 | { |
6784 | if (debug_infrun) | |
6785 | fprintf_unfiltered (gdb_stdlog, | |
6786 | "infrun: stepped into indirect branch thunk\n"); | |
6787 | keep_going (ecs); | |
6788 | return; | |
6789 | } | |
6790 | ||
16c381f0 JK |
6791 | if (ecs->event_thread->control.step_range_end != 1 |
6792 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
6793 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 6794 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 6795 | { |
527159b7 | 6796 | if (debug_infrun) |
3e43a32a MS |
6797 | fprintf_unfiltered (gdb_stdlog, |
6798 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 6799 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
6800 | a signal trampoline (either by a signal being delivered or by |
6801 | the signal handler returning). Just single-step until the | |
6802 | inferior leaves the trampoline (either by calling the handler | |
6803 | or returning). */ | |
488f131b JB |
6804 | keep_going (ecs); |
6805 | return; | |
6806 | } | |
c906108c | 6807 | |
14132e89 MR |
6808 | /* If we're in the return path from a shared library trampoline, |
6809 | we want to proceed through the trampoline when stepping. */ | |
6810 | /* macro/2012-04-25: This needs to come before the subroutine | |
6811 | call check below as on some targets return trampolines look | |
6812 | like subroutine calls (MIPS16 return thunks). */ | |
6813 | if (gdbarch_in_solib_return_trampoline (gdbarch, | |
f2ffa92b PA |
6814 | ecs->event_thread->suspend.stop_pc, |
6815 | ecs->stop_func_name) | |
14132e89 MR |
6816 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
6817 | { | |
6818 | /* Determine where this trampoline returns. */ | |
f2ffa92b PA |
6819 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
6820 | CORE_ADDR real_stop_pc | |
6821 | = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); | |
14132e89 MR |
6822 | |
6823 | if (debug_infrun) | |
6824 | fprintf_unfiltered (gdb_stdlog, | |
6825 | "infrun: stepped into solib return tramp\n"); | |
6826 | ||
6827 | /* Only proceed through if we know where it's going. */ | |
6828 | if (real_stop_pc) | |
6829 | { | |
6830 | /* And put the step-breakpoint there and go until there. */ | |
51abb421 | 6831 | symtab_and_line sr_sal; |
14132e89 MR |
6832 | sr_sal.pc = real_stop_pc; |
6833 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
6834 | sr_sal.pspace = get_frame_program_space (frame); | |
6835 | ||
6836 | /* Do not specify what the fp should be when we stop since | |
6837 | on some machines the prologue is where the new fp value | |
6838 | is established. */ | |
6839 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6840 | sr_sal, null_frame_id); | |
6841 | ||
6842 | /* Restart without fiddling with the step ranges or | |
6843 | other state. */ | |
6844 | keep_going (ecs); | |
6845 | return; | |
6846 | } | |
6847 | } | |
6848 | ||
c17eaafe DJ |
6849 | /* Check for subroutine calls. The check for the current frame |
6850 | equalling the step ID is not necessary - the check of the | |
6851 | previous frame's ID is sufficient - but it is a common case and | |
6852 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
6853 | |
6854 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
6855 | being equal, so to get into this block, both the current and | |
6856 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
6857 | /* The outer_frame_id check is a heuristic to detect stepping |
6858 | through startup code. If we step over an instruction which | |
6859 | sets the stack pointer from an invalid value to a valid value, | |
6860 | we may detect that as a subroutine call from the mythical | |
6861 | "outermost" function. This could be fixed by marking | |
6862 | outermost frames as !stack_p,code_p,special_p. Then the | |
6863 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 6864 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 6865 | for more. */ |
edb3359d | 6866 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 6867 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 6868 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
6869 | ecs->event_thread->control.step_stack_frame_id) |
6870 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a | 6871 | outer_frame_id) |
885eeb5b | 6872 | || (ecs->event_thread->control.step_start_function |
f2ffa92b | 6873 | != find_pc_function (ecs->event_thread->suspend.stop_pc))))) |
488f131b | 6874 | { |
f2ffa92b | 6875 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
95918acb | 6876 | CORE_ADDR real_stop_pc; |
8fb3e588 | 6877 | |
527159b7 | 6878 | if (debug_infrun) |
8a9de0e4 | 6879 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 6880 | |
b7a084be | 6881 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
95918acb AC |
6882 | { |
6883 | /* I presume that step_over_calls is only 0 when we're | |
6884 | supposed to be stepping at the assembly language level | |
6885 | ("stepi"). Just stop. */ | |
388a8562 | 6886 | /* And this works the same backward as frontward. MVS */ |
bdc36728 | 6887 | end_stepping_range (ecs); |
95918acb AC |
6888 | return; |
6889 | } | |
8fb3e588 | 6890 | |
388a8562 MS |
6891 | /* Reverse stepping through solib trampolines. */ |
6892 | ||
6893 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 6894 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
6895 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
6896 | || (ecs->stop_func_start == 0 | |
6897 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
6898 | { | |
6899 | /* Any solib trampoline code can be handled in reverse | |
6900 | by simply continuing to single-step. We have already | |
6901 | executed the solib function (backwards), and a few | |
6902 | steps will take us back through the trampoline to the | |
6903 | caller. */ | |
6904 | keep_going (ecs); | |
6905 | return; | |
6906 | } | |
6907 | ||
16c381f0 | 6908 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 6909 | { |
b2175913 MS |
6910 | /* We're doing a "next". |
6911 | ||
6912 | Normal (forward) execution: set a breakpoint at the | |
6913 | callee's return address (the address at which the caller | |
6914 | will resume). | |
6915 | ||
6916 | Reverse (backward) execution. set the step-resume | |
6917 | breakpoint at the start of the function that we just | |
6918 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 6919 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
6920 | |
6921 | if (execution_direction == EXEC_REVERSE) | |
6922 | { | |
acf9414f JK |
6923 | /* If we're already at the start of the function, we've either |
6924 | just stepped backward into a single instruction function, | |
6925 | or stepped back out of a signal handler to the first instruction | |
6926 | of the function. Just keep going, which will single-step back | |
6927 | to the caller. */ | |
58c48e72 | 6928 | if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0) |
acf9414f | 6929 | { |
acf9414f | 6930 | /* Normal function call return (static or dynamic). */ |
51abb421 | 6931 | symtab_and_line sr_sal; |
acf9414f JK |
6932 | sr_sal.pc = ecs->stop_func_start; |
6933 | sr_sal.pspace = get_frame_program_space (frame); | |
6934 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
6935 | sr_sal, null_frame_id); | |
6936 | } | |
b2175913 MS |
6937 | } |
6938 | else | |
568d6575 | 6939 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 6940 | |
8567c30f AC |
6941 | keep_going (ecs); |
6942 | return; | |
6943 | } | |
a53c66de | 6944 | |
95918acb | 6945 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
6946 | calling routine and the real function), locate the real |
6947 | function. That's what tells us (a) whether we want to step | |
6948 | into it at all, and (b) what prologue we want to run to the | |
6949 | end of, if we do step into it. */ | |
568d6575 | 6950 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 6951 | if (real_stop_pc == 0) |
568d6575 | 6952 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
6953 | if (real_stop_pc != 0) |
6954 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 6955 | |
db5f024e | 6956 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 | 6957 | { |
51abb421 | 6958 | symtab_and_line sr_sal; |
1b2bfbb9 | 6959 | sr_sal.pc = ecs->stop_func_start; |
6c95b8df | 6960 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 6961 | |
a6d9a66e UW |
6962 | insert_step_resume_breakpoint_at_sal (gdbarch, |
6963 | sr_sal, null_frame_id); | |
8fb3e588 AC |
6964 | keep_going (ecs); |
6965 | return; | |
1b2bfbb9 RC |
6966 | } |
6967 | ||
95918acb | 6968 | /* If we have line number information for the function we are |
1bfeeb0f JL |
6969 | thinking of stepping into and the function isn't on the skip |
6970 | list, step into it. | |
95918acb | 6971 | |
8fb3e588 AC |
6972 | If there are several symtabs at that PC (e.g. with include |
6973 | files), just want to know whether *any* of them have line | |
6974 | numbers. find_pc_line handles this. */ | |
95918acb AC |
6975 | { |
6976 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 6977 | |
95918acb | 6978 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 | 6979 | if (tmp_sal.line != 0 |
85817405 | 6980 | && !function_name_is_marked_for_skip (ecs->stop_func_name, |
4a4c04f1 BE |
6981 | tmp_sal) |
6982 | && !inline_frame_is_marked_for_skip (true, ecs->event_thread)) | |
95918acb | 6983 | { |
b2175913 | 6984 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 6985 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 6986 | else |
568d6575 | 6987 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
6988 | return; |
6989 | } | |
6990 | } | |
6991 | ||
6992 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
6993 | set, we stop the step so that the user has a chance to switch |
6994 | in assembly mode. */ | |
16c381f0 | 6995 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 6996 | && step_stop_if_no_debug) |
95918acb | 6997 | { |
bdc36728 | 6998 | end_stepping_range (ecs); |
95918acb AC |
6999 | return; |
7000 | } | |
7001 | ||
b2175913 MS |
7002 | if (execution_direction == EXEC_REVERSE) |
7003 | { | |
acf9414f JK |
7004 | /* If we're already at the start of the function, we've either just |
7005 | stepped backward into a single instruction function without line | |
7006 | number info, or stepped back out of a signal handler to the first | |
7007 | instruction of the function without line number info. Just keep | |
7008 | going, which will single-step back to the caller. */ | |
7009 | if (ecs->stop_func_start != stop_pc) | |
7010 | { | |
7011 | /* Set a breakpoint at callee's start address. | |
7012 | From there we can step once and be back in the caller. */ | |
51abb421 | 7013 | symtab_and_line sr_sal; |
acf9414f JK |
7014 | sr_sal.pc = ecs->stop_func_start; |
7015 | sr_sal.pspace = get_frame_program_space (frame); | |
7016 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
7017 | sr_sal, null_frame_id); | |
7018 | } | |
b2175913 MS |
7019 | } |
7020 | else | |
7021 | /* Set a breakpoint at callee's return address (the address | |
7022 | at which the caller will resume). */ | |
568d6575 | 7023 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 7024 | |
95918acb | 7025 | keep_going (ecs); |
488f131b | 7026 | return; |
488f131b | 7027 | } |
c906108c | 7028 | |
fdd654f3 MS |
7029 | /* Reverse stepping through solib trampolines. */ |
7030 | ||
7031 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 7032 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 | 7033 | { |
f2ffa92b PA |
7034 | CORE_ADDR stop_pc = ecs->event_thread->suspend.stop_pc; |
7035 | ||
fdd654f3 MS |
7036 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
7037 | || (ecs->stop_func_start == 0 | |
7038 | && in_solib_dynsym_resolve_code (stop_pc))) | |
7039 | { | |
7040 | /* Any solib trampoline code can be handled in reverse | |
7041 | by simply continuing to single-step. We have already | |
7042 | executed the solib function (backwards), and a few | |
7043 | steps will take us back through the trampoline to the | |
7044 | caller. */ | |
7045 | keep_going (ecs); | |
7046 | return; | |
7047 | } | |
7048 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
7049 | { | |
7050 | /* Stepped backward into the solib dynsym resolver. | |
7051 | Set a breakpoint at its start and continue, then | |
7052 | one more step will take us out. */ | |
51abb421 | 7053 | symtab_and_line sr_sal; |
fdd654f3 | 7054 | sr_sal.pc = ecs->stop_func_start; |
9d1807c3 | 7055 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
7056 | insert_step_resume_breakpoint_at_sal (gdbarch, |
7057 | sr_sal, null_frame_id); | |
7058 | keep_going (ecs); | |
7059 | return; | |
7060 | } | |
7061 | } | |
7062 | ||
8c95582d AB |
7063 | /* This always returns the sal for the inner-most frame when we are in a |
7064 | stack of inlined frames, even if GDB actually believes that it is in a | |
7065 | more outer frame. This is checked for below by calls to | |
7066 | inline_skipped_frames. */ | |
f2ffa92b | 7067 | stop_pc_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
7ed0fe66 | 7068 | |
1b2bfbb9 RC |
7069 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
7070 | the trampoline processing logic, however, there are some trampolines | |
7071 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 7072 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 7073 | && ecs->stop_func_name == NULL |
2afb61aa | 7074 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 7075 | { |
527159b7 | 7076 | if (debug_infrun) |
3e43a32a MS |
7077 | fprintf_unfiltered (gdb_stdlog, |
7078 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 7079 | |
1b2bfbb9 | 7080 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
7081 | undebuggable function (where there is no debugging information |
7082 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
7083 | inferior stopped). Since we want to skip this kind of code, |
7084 | we keep going until the inferior returns from this | |
14e60db5 DJ |
7085 | function - unless the user has asked us not to (via |
7086 | set step-mode) or we no longer know how to get back | |
7087 | to the call site. */ | |
7088 | if (step_stop_if_no_debug | |
c7ce8faa | 7089 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
7090 | { |
7091 | /* If we have no line number and the step-stop-if-no-debug | |
7092 | is set, we stop the step so that the user has a chance to | |
7093 | switch in assembly mode. */ | |
bdc36728 | 7094 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7095 | return; |
7096 | } | |
7097 | else | |
7098 | { | |
7099 | /* Set a breakpoint at callee's return address (the address | |
7100 | at which the caller will resume). */ | |
568d6575 | 7101 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
7102 | keep_going (ecs); |
7103 | return; | |
7104 | } | |
7105 | } | |
7106 | ||
16c381f0 | 7107 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
7108 | { |
7109 | /* It is stepi or nexti. We always want to stop stepping after | |
7110 | one instruction. */ | |
527159b7 | 7111 | if (debug_infrun) |
8a9de0e4 | 7112 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
bdc36728 | 7113 | end_stepping_range (ecs); |
1b2bfbb9 RC |
7114 | return; |
7115 | } | |
7116 | ||
2afb61aa | 7117 | if (stop_pc_sal.line == 0) |
488f131b JB |
7118 | { |
7119 | /* We have no line number information. That means to stop | |
7120 | stepping (does this always happen right after one instruction, | |
7121 | when we do "s" in a function with no line numbers, | |
7122 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 7123 | if (debug_infrun) |
8a9de0e4 | 7124 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
bdc36728 | 7125 | end_stepping_range (ecs); |
488f131b JB |
7126 | return; |
7127 | } | |
c906108c | 7128 | |
edb3359d DJ |
7129 | /* Look for "calls" to inlined functions, part one. If the inline |
7130 | frame machinery detected some skipped call sites, we have entered | |
7131 | a new inline function. */ | |
7132 | ||
7133 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7134 | ecs->event_thread->control.step_frame_id) |
00431a78 | 7135 | && inline_skipped_frames (ecs->event_thread)) |
edb3359d | 7136 | { |
edb3359d DJ |
7137 | if (debug_infrun) |
7138 | fprintf_unfiltered (gdb_stdlog, | |
7139 | "infrun: stepped into inlined function\n"); | |
7140 | ||
51abb421 | 7141 | symtab_and_line call_sal = find_frame_sal (get_current_frame ()); |
edb3359d | 7142 | |
16c381f0 | 7143 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
7144 | { |
7145 | /* For "step", we're going to stop. But if the call site | |
7146 | for this inlined function is on the same source line as | |
7147 | we were previously stepping, go down into the function | |
7148 | first. Otherwise stop at the call site. */ | |
7149 | ||
7150 | if (call_sal.line == ecs->event_thread->current_line | |
7151 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
4a4c04f1 BE |
7152 | { |
7153 | step_into_inline_frame (ecs->event_thread); | |
7154 | if (inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
7155 | { | |
7156 | keep_going (ecs); | |
7157 | return; | |
7158 | } | |
7159 | } | |
edb3359d | 7160 | |
bdc36728 | 7161 | end_stepping_range (ecs); |
edb3359d DJ |
7162 | return; |
7163 | } | |
7164 | else | |
7165 | { | |
7166 | /* For "next", we should stop at the call site if it is on a | |
7167 | different source line. Otherwise continue through the | |
7168 | inlined function. */ | |
7169 | if (call_sal.line == ecs->event_thread->current_line | |
7170 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
7171 | keep_going (ecs); | |
7172 | else | |
bdc36728 | 7173 | end_stepping_range (ecs); |
edb3359d DJ |
7174 | return; |
7175 | } | |
7176 | } | |
7177 | ||
7178 | /* Look for "calls" to inlined functions, part two. If we are still | |
7179 | in the same real function we were stepping through, but we have | |
7180 | to go further up to find the exact frame ID, we are stepping | |
7181 | through a more inlined call beyond its call site. */ | |
7182 | ||
7183 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
7184 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 7185 | ecs->event_thread->control.step_frame_id) |
edb3359d | 7186 | && stepped_in_from (get_current_frame (), |
16c381f0 | 7187 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
7188 | { |
7189 | if (debug_infrun) | |
7190 | fprintf_unfiltered (gdb_stdlog, | |
7191 | "infrun: stepping through inlined function\n"); | |
7192 | ||
4a4c04f1 BE |
7193 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL |
7194 | || inline_frame_is_marked_for_skip (false, ecs->event_thread)) | |
edb3359d DJ |
7195 | keep_going (ecs); |
7196 | else | |
bdc36728 | 7197 | end_stepping_range (ecs); |
edb3359d DJ |
7198 | return; |
7199 | } | |
7200 | ||
8c95582d | 7201 | bool refresh_step_info = true; |
f2ffa92b | 7202 | if ((ecs->event_thread->suspend.stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
7203 | && (ecs->event_thread->current_line != stop_pc_sal.line |
7204 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b | 7205 | { |
8c95582d AB |
7206 | if (stop_pc_sal.is_stmt) |
7207 | { | |
7208 | /* We are at the start of a different line. So stop. Note that | |
7209 | we don't stop if we step into the middle of a different line. | |
7210 | That is said to make things like for (;;) statements work | |
7211 | better. */ | |
7212 | if (debug_infrun) | |
7213 | fprintf_unfiltered (gdb_stdlog, | |
7214 | "infrun: stepped to a different line\n"); | |
7215 | end_stepping_range (ecs); | |
7216 | return; | |
7217 | } | |
7218 | else if (frame_id_eq (get_frame_id (get_current_frame ()), | |
7219 | ecs->event_thread->control.step_frame_id)) | |
7220 | { | |
7221 | /* We are at the start of a different line, however, this line is | |
7222 | not marked as a statement, and we have not changed frame. We | |
7223 | ignore this line table entry, and continue stepping forward, | |
7224 | looking for a better place to stop. */ | |
7225 | refresh_step_info = false; | |
7226 | if (debug_infrun) | |
7227 | fprintf_unfiltered (gdb_stdlog, | |
7228 | "infrun: stepped to a different line, but " | |
7229 | "it's not the start of a statement\n"); | |
7230 | } | |
488f131b | 7231 | } |
c906108c | 7232 | |
488f131b | 7233 | /* We aren't done stepping. |
c906108c | 7234 | |
488f131b JB |
7235 | Optimize by setting the stepping range to the line. |
7236 | (We might not be in the original line, but if we entered a | |
7237 | new line in mid-statement, we continue stepping. This makes | |
8c95582d AB |
7238 | things like for(;;) statements work better.) |
7239 | ||
7240 | If we entered a SAL that indicates a non-statement line table entry, | |
7241 | then we update the stepping range, but we don't update the step info, | |
7242 | which includes things like the line number we are stepping away from. | |
7243 | This means we will stop when we find a line table entry that is marked | |
7244 | as is-statement, even if it matches the non-statement one we just | |
7245 | stepped into. */ | |
c906108c | 7246 | |
16c381f0 JK |
7247 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
7248 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
c1e36e3e | 7249 | ecs->event_thread->control.may_range_step = 1; |
8c95582d AB |
7250 | if (refresh_step_info) |
7251 | set_step_info (ecs->event_thread, frame, stop_pc_sal); | |
488f131b | 7252 | |
527159b7 | 7253 | if (debug_infrun) |
8a9de0e4 | 7254 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 7255 | keep_going (ecs); |
104c1213 JM |
7256 | } |
7257 | ||
c447ac0b PA |
7258 | /* In all-stop mode, if we're currently stepping but have stopped in |
7259 | some other thread, we may need to switch back to the stepped | |
7260 | thread. Returns true we set the inferior running, false if we left | |
7261 | it stopped (and the event needs further processing). */ | |
7262 | ||
7263 | static int | |
7264 | switch_back_to_stepped_thread (struct execution_control_state *ecs) | |
7265 | { | |
fbea99ea | 7266 | if (!target_is_non_stop_p ()) |
c447ac0b | 7267 | { |
99619bea PA |
7268 | struct thread_info *stepping_thread; |
7269 | ||
7270 | /* If any thread is blocked on some internal breakpoint, and we | |
7271 | simply need to step over that breakpoint to get it going | |
7272 | again, do that first. */ | |
7273 | ||
7274 | /* However, if we see an event for the stepping thread, then we | |
7275 | know all other threads have been moved past their breakpoints | |
7276 | already. Let the caller check whether the step is finished, | |
7277 | etc., before deciding to move it past a breakpoint. */ | |
7278 | if (ecs->event_thread->control.step_range_end != 0) | |
7279 | return 0; | |
7280 | ||
7281 | /* Check if the current thread is blocked on an incomplete | |
7282 | step-over, interrupted by a random signal. */ | |
7283 | if (ecs->event_thread->control.trap_expected | |
7284 | && ecs->event_thread->suspend.stop_signal != GDB_SIGNAL_TRAP) | |
c447ac0b | 7285 | { |
99619bea PA |
7286 | if (debug_infrun) |
7287 | { | |
7288 | fprintf_unfiltered (gdb_stdlog, | |
7289 | "infrun: need to finish step-over of [%s]\n", | |
a068643d | 7290 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); |
99619bea PA |
7291 | } |
7292 | keep_going (ecs); | |
7293 | return 1; | |
7294 | } | |
2adfaa28 | 7295 | |
99619bea PA |
7296 | /* Check if the current thread is blocked by a single-step |
7297 | breakpoint of another thread. */ | |
7298 | if (ecs->hit_singlestep_breakpoint) | |
7299 | { | |
7300 | if (debug_infrun) | |
7301 | { | |
7302 | fprintf_unfiltered (gdb_stdlog, | |
7303 | "infrun: need to step [%s] over single-step " | |
7304 | "breakpoint\n", | |
a068643d | 7305 | target_pid_to_str (ecs->ptid).c_str ()); |
99619bea PA |
7306 | } |
7307 | keep_going (ecs); | |
7308 | return 1; | |
7309 | } | |
7310 | ||
4d9d9d04 PA |
7311 | /* If this thread needs yet another step-over (e.g., stepping |
7312 | through a delay slot), do it first before moving on to | |
7313 | another thread. */ | |
7314 | if (thread_still_needs_step_over (ecs->event_thread)) | |
7315 | { | |
7316 | if (debug_infrun) | |
7317 | { | |
7318 | fprintf_unfiltered (gdb_stdlog, | |
7319 | "infrun: thread [%s] still needs step-over\n", | |
a068643d | 7320 | target_pid_to_str (ecs->event_thread->ptid).c_str ()); |
4d9d9d04 PA |
7321 | } |
7322 | keep_going (ecs); | |
7323 | return 1; | |
7324 | } | |
70509625 | 7325 | |
483805cf PA |
7326 | /* If scheduler locking applies even if not stepping, there's no |
7327 | need to walk over threads. Above we've checked whether the | |
7328 | current thread is stepping. If some other thread not the | |
7329 | event thread is stepping, then it must be that scheduler | |
7330 | locking is not in effect. */ | |
856e7dd6 | 7331 | if (schedlock_applies (ecs->event_thread)) |
483805cf PA |
7332 | return 0; |
7333 | ||
4d9d9d04 PA |
7334 | /* Otherwise, we no longer expect a trap in the current thread. |
7335 | Clear the trap_expected flag before switching back -- this is | |
7336 | what keep_going does as well, if we call it. */ | |
7337 | ecs->event_thread->control.trap_expected = 0; | |
7338 | ||
7339 | /* Likewise, clear the signal if it should not be passed. */ | |
7340 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
7341 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
7342 | ||
7343 | /* Do all pending step-overs before actually proceeding with | |
483805cf | 7344 | step/next/etc. */ |
4d9d9d04 PA |
7345 | if (start_step_over ()) |
7346 | { | |
7347 | prepare_to_wait (ecs); | |
7348 | return 1; | |
7349 | } | |
7350 | ||
7351 | /* Look for the stepping/nexting thread. */ | |
483805cf | 7352 | stepping_thread = NULL; |
4d9d9d04 | 7353 | |
08036331 | 7354 | for (thread_info *tp : all_non_exited_threads ()) |
483805cf | 7355 | { |
f3f8ece4 PA |
7356 | switch_to_thread_no_regs (tp); |
7357 | ||
fbea99ea PA |
7358 | /* Ignore threads of processes the caller is not |
7359 | resuming. */ | |
483805cf | 7360 | if (!sched_multi |
5b6d1e4f PA |
7361 | && (tp->inf->process_target () != ecs->target |
7362 | || tp->inf->pid != ecs->ptid.pid ())) | |
483805cf PA |
7363 | continue; |
7364 | ||
7365 | /* When stepping over a breakpoint, we lock all threads | |
7366 | except the one that needs to move past the breakpoint. | |
7367 | If a non-event thread has this set, the "incomplete | |
7368 | step-over" check above should have caught it earlier. */ | |
372316f1 PA |
7369 | if (tp->control.trap_expected) |
7370 | { | |
7371 | internal_error (__FILE__, __LINE__, | |
7372 | "[%s] has inconsistent state: " | |
7373 | "trap_expected=%d\n", | |
a068643d | 7374 | target_pid_to_str (tp->ptid).c_str (), |
372316f1 PA |
7375 | tp->control.trap_expected); |
7376 | } | |
483805cf PA |
7377 | |
7378 | /* Did we find the stepping thread? */ | |
7379 | if (tp->control.step_range_end) | |
7380 | { | |
7381 | /* Yep. There should only one though. */ | |
7382 | gdb_assert (stepping_thread == NULL); | |
7383 | ||
7384 | /* The event thread is handled at the top, before we | |
7385 | enter this loop. */ | |
7386 | gdb_assert (tp != ecs->event_thread); | |
7387 | ||
7388 | /* If some thread other than the event thread is | |
7389 | stepping, then scheduler locking can't be in effect, | |
7390 | otherwise we wouldn't have resumed the current event | |
7391 | thread in the first place. */ | |
856e7dd6 | 7392 | gdb_assert (!schedlock_applies (tp)); |
483805cf PA |
7393 | |
7394 | stepping_thread = tp; | |
7395 | } | |
99619bea PA |
7396 | } |
7397 | ||
483805cf | 7398 | if (stepping_thread != NULL) |
99619bea | 7399 | { |
c447ac0b PA |
7400 | if (debug_infrun) |
7401 | fprintf_unfiltered (gdb_stdlog, | |
7402 | "infrun: switching back to stepped thread\n"); | |
7403 | ||
2ac7589c PA |
7404 | if (keep_going_stepped_thread (stepping_thread)) |
7405 | { | |
7406 | prepare_to_wait (ecs); | |
7407 | return 1; | |
7408 | } | |
7409 | } | |
f3f8ece4 PA |
7410 | |
7411 | switch_to_thread (ecs->event_thread); | |
2ac7589c | 7412 | } |
2adfaa28 | 7413 | |
2ac7589c PA |
7414 | return 0; |
7415 | } | |
2adfaa28 | 7416 | |
2ac7589c PA |
7417 | /* Set a previously stepped thread back to stepping. Returns true on |
7418 | success, false if the resume is not possible (e.g., the thread | |
7419 | vanished). */ | |
7420 | ||
7421 | static int | |
7422 | keep_going_stepped_thread (struct thread_info *tp) | |
7423 | { | |
7424 | struct frame_info *frame; | |
2ac7589c PA |
7425 | struct execution_control_state ecss; |
7426 | struct execution_control_state *ecs = &ecss; | |
2adfaa28 | 7427 | |
2ac7589c PA |
7428 | /* If the stepping thread exited, then don't try to switch back and |
7429 | resume it, which could fail in several different ways depending | |
7430 | on the target. Instead, just keep going. | |
2adfaa28 | 7431 | |
2ac7589c PA |
7432 | We can find a stepping dead thread in the thread list in two |
7433 | cases: | |
2adfaa28 | 7434 | |
2ac7589c PA |
7435 | - The target supports thread exit events, and when the target |
7436 | tries to delete the thread from the thread list, inferior_ptid | |
7437 | pointed at the exiting thread. In such case, calling | |
7438 | delete_thread does not really remove the thread from the list; | |
7439 | instead, the thread is left listed, with 'exited' state. | |
64ce06e4 | 7440 | |
2ac7589c PA |
7441 | - The target's debug interface does not support thread exit |
7442 | events, and so we have no idea whatsoever if the previously | |
7443 | stepping thread is still alive. For that reason, we need to | |
7444 | synchronously query the target now. */ | |
2adfaa28 | 7445 | |
00431a78 | 7446 | if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid)) |
2ac7589c PA |
7447 | { |
7448 | if (debug_infrun) | |
7449 | fprintf_unfiltered (gdb_stdlog, | |
7450 | "infrun: not resuming previously " | |
7451 | "stepped thread, it has vanished\n"); | |
7452 | ||
00431a78 | 7453 | delete_thread (tp); |
2ac7589c | 7454 | return 0; |
c447ac0b | 7455 | } |
2ac7589c PA |
7456 | |
7457 | if (debug_infrun) | |
7458 | fprintf_unfiltered (gdb_stdlog, | |
7459 | "infrun: resuming previously stepped thread\n"); | |
7460 | ||
7461 | reset_ecs (ecs, tp); | |
00431a78 | 7462 | switch_to_thread (tp); |
2ac7589c | 7463 | |
f2ffa92b | 7464 | tp->suspend.stop_pc = regcache_read_pc (get_thread_regcache (tp)); |
2ac7589c | 7465 | frame = get_current_frame (); |
2ac7589c PA |
7466 | |
7467 | /* If the PC of the thread we were trying to single-step has | |
7468 | changed, then that thread has trapped or been signaled, but the | |
7469 | event has not been reported to GDB yet. Re-poll the target | |
7470 | looking for this particular thread's event (i.e. temporarily | |
7471 | enable schedlock) by: | |
7472 | ||
7473 | - setting a break at the current PC | |
7474 | - resuming that particular thread, only (by setting trap | |
7475 | expected) | |
7476 | ||
7477 | This prevents us continuously moving the single-step breakpoint | |
7478 | forward, one instruction at a time, overstepping. */ | |
7479 | ||
f2ffa92b | 7480 | if (tp->suspend.stop_pc != tp->prev_pc) |
2ac7589c PA |
7481 | { |
7482 | ptid_t resume_ptid; | |
7483 | ||
7484 | if (debug_infrun) | |
7485 | fprintf_unfiltered (gdb_stdlog, | |
7486 | "infrun: expected thread advanced also (%s -> %s)\n", | |
7487 | paddress (target_gdbarch (), tp->prev_pc), | |
f2ffa92b | 7488 | paddress (target_gdbarch (), tp->suspend.stop_pc)); |
2ac7589c PA |
7489 | |
7490 | /* Clear the info of the previous step-over, as it's no longer | |
7491 | valid (if the thread was trying to step over a breakpoint, it | |
7492 | has already succeeded). It's what keep_going would do too, | |
7493 | if we called it. Do this before trying to insert the sss | |
7494 | breakpoint, otherwise if we were previously trying to step | |
7495 | over this exact address in another thread, the breakpoint is | |
7496 | skipped. */ | |
7497 | clear_step_over_info (); | |
7498 | tp->control.trap_expected = 0; | |
7499 | ||
7500 | insert_single_step_breakpoint (get_frame_arch (frame), | |
7501 | get_frame_address_space (frame), | |
f2ffa92b | 7502 | tp->suspend.stop_pc); |
2ac7589c | 7503 | |
719546c4 | 7504 | tp->resumed = true; |
fbea99ea | 7505 | resume_ptid = internal_resume_ptid (tp->control.stepping_command); |
2ac7589c PA |
7506 | do_target_resume (resume_ptid, 0, GDB_SIGNAL_0); |
7507 | } | |
7508 | else | |
7509 | { | |
7510 | if (debug_infrun) | |
7511 | fprintf_unfiltered (gdb_stdlog, | |
7512 | "infrun: expected thread still hasn't advanced\n"); | |
7513 | ||
7514 | keep_going_pass_signal (ecs); | |
7515 | } | |
7516 | return 1; | |
c447ac0b PA |
7517 | } |
7518 | ||
8b061563 PA |
7519 | /* Is thread TP in the middle of (software or hardware) |
7520 | single-stepping? (Note the result of this function must never be | |
7521 | passed directly as target_resume's STEP parameter.) */ | |
104c1213 | 7522 | |
a289b8f6 | 7523 | static int |
b3444185 | 7524 | currently_stepping (struct thread_info *tp) |
a7212384 | 7525 | { |
8358c15c JK |
7526 | return ((tp->control.step_range_end |
7527 | && tp->control.step_resume_breakpoint == NULL) | |
7528 | || tp->control.trap_expected | |
af48d08f | 7529 | || tp->stepped_breakpoint |
8358c15c | 7530 | || bpstat_should_step ()); |
a7212384 UW |
7531 | } |
7532 | ||
b2175913 MS |
7533 | /* Inferior has stepped into a subroutine call with source code that |
7534 | we should not step over. Do step to the first line of code in | |
7535 | it. */ | |
c2c6d25f JM |
7536 | |
7537 | static void | |
568d6575 UW |
7538 | handle_step_into_function (struct gdbarch *gdbarch, |
7539 | struct execution_control_state *ecs) | |
c2c6d25f | 7540 | { |
7e324e48 GB |
7541 | fill_in_stop_func (gdbarch, ecs); |
7542 | ||
f2ffa92b PA |
7543 | compunit_symtab *cust |
7544 | = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); | |
43f3e411 | 7545 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7546 | ecs->stop_func_start |
7547 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
c2c6d25f | 7548 | |
51abb421 | 7549 | symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
7550 | /* Use the step_resume_break to step until the end of the prologue, |
7551 | even if that involves jumps (as it seems to on the vax under | |
7552 | 4.2). */ | |
7553 | /* If the prologue ends in the middle of a source line, continue to | |
7554 | the end of that source line (if it is still within the function). | |
7555 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
7556 | if (stop_func_sal.end |
7557 | && stop_func_sal.pc != ecs->stop_func_start | |
7558 | && stop_func_sal.end < ecs->stop_func_end) | |
7559 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 7560 | |
2dbd5e30 KB |
7561 | /* Architectures which require breakpoint adjustment might not be able |
7562 | to place a breakpoint at the computed address. If so, the test | |
7563 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
7564 | ecs->stop_func_start to an address at which a breakpoint may be | |
7565 | legitimately placed. | |
8fb3e588 | 7566 | |
2dbd5e30 KB |
7567 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
7568 | made, GDB will enter an infinite loop when stepping through | |
7569 | optimized code consisting of VLIW instructions which contain | |
7570 | subinstructions corresponding to different source lines. On | |
7571 | FR-V, it's not permitted to place a breakpoint on any but the | |
7572 | first subinstruction of a VLIW instruction. When a breakpoint is | |
7573 | set, GDB will adjust the breakpoint address to the beginning of | |
7574 | the VLIW instruction. Thus, we need to make the corresponding | |
7575 | adjustment here when computing the stop address. */ | |
8fb3e588 | 7576 | |
568d6575 | 7577 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
7578 | { |
7579 | ecs->stop_func_start | |
568d6575 | 7580 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 7581 | ecs->stop_func_start); |
2dbd5e30 KB |
7582 | } |
7583 | ||
f2ffa92b | 7584 | if (ecs->stop_func_start == ecs->event_thread->suspend.stop_pc) |
c2c6d25f JM |
7585 | { |
7586 | /* We are already there: stop now. */ | |
bdc36728 | 7587 | end_stepping_range (ecs); |
c2c6d25f JM |
7588 | return; |
7589 | } | |
7590 | else | |
7591 | { | |
7592 | /* Put the step-breakpoint there and go until there. */ | |
51abb421 | 7593 | symtab_and_line sr_sal; |
c2c6d25f JM |
7594 | sr_sal.pc = ecs->stop_func_start; |
7595 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 7596 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 7597 | |
c2c6d25f | 7598 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
7599 | some machines the prologue is where the new fp value is |
7600 | established. */ | |
a6d9a66e | 7601 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
7602 | |
7603 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
7604 | ecs->event_thread->control.step_range_end |
7605 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
7606 | } |
7607 | keep_going (ecs); | |
7608 | } | |
d4f3574e | 7609 | |
b2175913 MS |
7610 | /* Inferior has stepped backward into a subroutine call with source |
7611 | code that we should not step over. Do step to the beginning of the | |
7612 | last line of code in it. */ | |
7613 | ||
7614 | static void | |
568d6575 UW |
7615 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
7616 | struct execution_control_state *ecs) | |
b2175913 | 7617 | { |
43f3e411 | 7618 | struct compunit_symtab *cust; |
167e4384 | 7619 | struct symtab_and_line stop_func_sal; |
b2175913 | 7620 | |
7e324e48 GB |
7621 | fill_in_stop_func (gdbarch, ecs); |
7622 | ||
f2ffa92b | 7623 | cust = find_pc_compunit_symtab (ecs->event_thread->suspend.stop_pc); |
43f3e411 | 7624 | if (cust != NULL && compunit_language (cust) != language_asm) |
46a62268 YQ |
7625 | ecs->stop_func_start |
7626 | = gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start); | |
b2175913 | 7627 | |
f2ffa92b | 7628 | stop_func_sal = find_pc_line (ecs->event_thread->suspend.stop_pc, 0); |
b2175913 MS |
7629 | |
7630 | /* OK, we're just going to keep stepping here. */ | |
f2ffa92b | 7631 | if (stop_func_sal.pc == ecs->event_thread->suspend.stop_pc) |
b2175913 MS |
7632 | { |
7633 | /* We're there already. Just stop stepping now. */ | |
bdc36728 | 7634 | end_stepping_range (ecs); |
b2175913 MS |
7635 | } |
7636 | else | |
7637 | { | |
7638 | /* Else just reset the step range and keep going. | |
7639 | No step-resume breakpoint, they don't work for | |
7640 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
7641 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
7642 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
7643 | keep_going (ecs); |
7644 | } | |
7645 | return; | |
7646 | } | |
7647 | ||
d3169d93 | 7648 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
7649 | This is used to both functions and to skip over code. */ |
7650 | ||
7651 | static void | |
2c03e5be PA |
7652 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
7653 | struct symtab_and_line sr_sal, | |
7654 | struct frame_id sr_id, | |
7655 | enum bptype sr_type) | |
44cbf7b5 | 7656 | { |
611c83ae PA |
7657 | /* There should never be more than one step-resume or longjmp-resume |
7658 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 7659 | step_resume_breakpoint when one is already active. */ |
8358c15c | 7660 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 7661 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
7662 | |
7663 | if (debug_infrun) | |
7664 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7665 | "infrun: inserting step-resume breakpoint at %s\n", |
7666 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 7667 | |
8358c15c | 7668 | inferior_thread ()->control.step_resume_breakpoint |
454dafbd | 7669 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release (); |
2c03e5be PA |
7670 | } |
7671 | ||
9da8c2a0 | 7672 | void |
2c03e5be PA |
7673 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
7674 | struct symtab_and_line sr_sal, | |
7675 | struct frame_id sr_id) | |
7676 | { | |
7677 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
7678 | sr_sal, sr_id, | |
7679 | bp_step_resume); | |
44cbf7b5 | 7680 | } |
7ce450bd | 7681 | |
2c03e5be PA |
7682 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
7683 | This is used to skip a potential signal handler. | |
7ce450bd | 7684 | |
14e60db5 DJ |
7685 | This is called with the interrupted function's frame. The signal |
7686 | handler, when it returns, will resume the interrupted function at | |
7687 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
7688 | |
7689 | static void | |
2c03e5be | 7690 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 | 7691 | { |
f4c1edd8 | 7692 | gdb_assert (return_frame != NULL); |
d303a6c7 | 7693 | |
51abb421 PA |
7694 | struct gdbarch *gdbarch = get_frame_arch (return_frame); |
7695 | ||
7696 | symtab_and_line sr_sal; | |
568d6575 | 7697 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 7698 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7699 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 7700 | |
2c03e5be PA |
7701 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
7702 | get_stack_frame_id (return_frame), | |
7703 | bp_hp_step_resume); | |
d303a6c7 AC |
7704 | } |
7705 | ||
2c03e5be PA |
7706 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
7707 | is used to skip a function after stepping into it (for "next" or if | |
7708 | the called function has no debugging information). | |
14e60db5 DJ |
7709 | |
7710 | The current function has almost always been reached by single | |
7711 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
7712 | current function, and the breakpoint will be set at the caller's | |
7713 | resume address. | |
7714 | ||
7715 | This is a separate function rather than reusing | |
2c03e5be | 7716 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 7717 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 7718 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
7719 | |
7720 | static void | |
7721 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
7722 | { | |
14e60db5 DJ |
7723 | /* We shouldn't have gotten here if we don't know where the call site |
7724 | is. */ | |
c7ce8faa | 7725 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 | 7726 | |
51abb421 | 7727 | struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame); |
14e60db5 | 7728 | |
51abb421 | 7729 | symtab_and_line sr_sal; |
c7ce8faa DJ |
7730 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
7731 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 7732 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 7733 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 7734 | |
a6d9a66e | 7735 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 7736 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
7737 | } |
7738 | ||
611c83ae PA |
7739 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
7740 | new breakpoint at the target of a jmp_buf. The handling of | |
7741 | longjmp-resume uses the same mechanisms used for handling | |
7742 | "step-resume" breakpoints. */ | |
7743 | ||
7744 | static void | |
a6d9a66e | 7745 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae | 7746 | { |
e81a37f7 TT |
7747 | /* There should never be more than one longjmp-resume breakpoint per |
7748 | thread, so we should never be setting a new | |
611c83ae | 7749 | longjmp_resume_breakpoint when one is already active. */ |
e81a37f7 | 7750 | gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL); |
611c83ae PA |
7751 | |
7752 | if (debug_infrun) | |
7753 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
7754 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
7755 | paddress (gdbarch, pc)); | |
611c83ae | 7756 | |
e81a37f7 | 7757 | inferior_thread ()->control.exception_resume_breakpoint = |
454dafbd | 7758 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release (); |
611c83ae PA |
7759 | } |
7760 | ||
186c406b TT |
7761 | /* Insert an exception resume breakpoint. TP is the thread throwing |
7762 | the exception. The block B is the block of the unwinder debug hook | |
7763 | function. FRAME is the frame corresponding to the call to this | |
7764 | function. SYM is the symbol of the function argument holding the | |
7765 | target PC of the exception. */ | |
7766 | ||
7767 | static void | |
7768 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
3977b71f | 7769 | const struct block *b, |
186c406b TT |
7770 | struct frame_info *frame, |
7771 | struct symbol *sym) | |
7772 | { | |
a70b8144 | 7773 | try |
186c406b | 7774 | { |
63e43d3a | 7775 | struct block_symbol vsym; |
186c406b TT |
7776 | struct value *value; |
7777 | CORE_ADDR handler; | |
7778 | struct breakpoint *bp; | |
7779 | ||
987012b8 | 7780 | vsym = lookup_symbol_search_name (sym->search_name (), |
de63c46b | 7781 | b, VAR_DOMAIN); |
63e43d3a | 7782 | value = read_var_value (vsym.symbol, vsym.block, frame); |
186c406b TT |
7783 | /* If the value was optimized out, revert to the old behavior. */ |
7784 | if (! value_optimized_out (value)) | |
7785 | { | |
7786 | handler = value_as_address (value); | |
7787 | ||
7788 | if (debug_infrun) | |
7789 | fprintf_unfiltered (gdb_stdlog, | |
7790 | "infrun: exception resume at %lx\n", | |
7791 | (unsigned long) handler); | |
7792 | ||
7793 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd TT |
7794 | handler, |
7795 | bp_exception_resume).release (); | |
c70a6932 JK |
7796 | |
7797 | /* set_momentary_breakpoint_at_pc invalidates FRAME. */ | |
7798 | frame = NULL; | |
7799 | ||
5d5658a1 | 7800 | bp->thread = tp->global_num; |
186c406b TT |
7801 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7802 | } | |
7803 | } | |
230d2906 | 7804 | catch (const gdb_exception_error &e) |
492d29ea PA |
7805 | { |
7806 | /* We want to ignore errors here. */ | |
7807 | } | |
186c406b TT |
7808 | } |
7809 | ||
28106bc2 SDJ |
7810 | /* A helper for check_exception_resume that sets an |
7811 | exception-breakpoint based on a SystemTap probe. */ | |
7812 | ||
7813 | static void | |
7814 | insert_exception_resume_from_probe (struct thread_info *tp, | |
729662a5 | 7815 | const struct bound_probe *probe, |
28106bc2 SDJ |
7816 | struct frame_info *frame) |
7817 | { | |
7818 | struct value *arg_value; | |
7819 | CORE_ADDR handler; | |
7820 | struct breakpoint *bp; | |
7821 | ||
7822 | arg_value = probe_safe_evaluate_at_pc (frame, 1); | |
7823 | if (!arg_value) | |
7824 | return; | |
7825 | ||
7826 | handler = value_as_address (arg_value); | |
7827 | ||
7828 | if (debug_infrun) | |
7829 | fprintf_unfiltered (gdb_stdlog, | |
7830 | "infrun: exception resume at %s\n", | |
08feed99 | 7831 | paddress (probe->objfile->arch (), |
28106bc2 SDJ |
7832 | handler)); |
7833 | ||
7834 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
454dafbd | 7835 | handler, bp_exception_resume).release (); |
5d5658a1 | 7836 | bp->thread = tp->global_num; |
28106bc2 SDJ |
7837 | inferior_thread ()->control.exception_resume_breakpoint = bp; |
7838 | } | |
7839 | ||
186c406b TT |
7840 | /* This is called when an exception has been intercepted. Check to |
7841 | see whether the exception's destination is of interest, and if so, | |
7842 | set an exception resume breakpoint there. */ | |
7843 | ||
7844 | static void | |
7845 | check_exception_resume (struct execution_control_state *ecs, | |
28106bc2 | 7846 | struct frame_info *frame) |
186c406b | 7847 | { |
729662a5 | 7848 | struct bound_probe probe; |
28106bc2 SDJ |
7849 | struct symbol *func; |
7850 | ||
7851 | /* First see if this exception unwinding breakpoint was set via a | |
7852 | SystemTap probe point. If so, the probe has two arguments: the | |
7853 | CFA and the HANDLER. We ignore the CFA, extract the handler, and | |
7854 | set a breakpoint there. */ | |
6bac7473 | 7855 | probe = find_probe_by_pc (get_frame_pc (frame)); |
935676c9 | 7856 | if (probe.prob) |
28106bc2 | 7857 | { |
729662a5 | 7858 | insert_exception_resume_from_probe (ecs->event_thread, &probe, frame); |
28106bc2 SDJ |
7859 | return; |
7860 | } | |
7861 | ||
7862 | func = get_frame_function (frame); | |
7863 | if (!func) | |
7864 | return; | |
186c406b | 7865 | |
a70b8144 | 7866 | try |
186c406b | 7867 | { |
3977b71f | 7868 | const struct block *b; |
8157b174 | 7869 | struct block_iterator iter; |
186c406b TT |
7870 | struct symbol *sym; |
7871 | int argno = 0; | |
7872 | ||
7873 | /* The exception breakpoint is a thread-specific breakpoint on | |
7874 | the unwinder's debug hook, declared as: | |
7875 | ||
7876 | void _Unwind_DebugHook (void *cfa, void *handler); | |
7877 | ||
7878 | The CFA argument indicates the frame to which control is | |
7879 | about to be transferred. HANDLER is the destination PC. | |
7880 | ||
7881 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
7882 | This is not extremely efficient but it avoids issues in gdb | |
7883 | with computing the DWARF CFA, and it also works even in weird | |
7884 | cases such as throwing an exception from inside a signal | |
7885 | handler. */ | |
7886 | ||
7887 | b = SYMBOL_BLOCK_VALUE (func); | |
7888 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
7889 | { | |
7890 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
7891 | continue; | |
7892 | ||
7893 | if (argno == 0) | |
7894 | ++argno; | |
7895 | else | |
7896 | { | |
7897 | insert_exception_resume_breakpoint (ecs->event_thread, | |
7898 | b, frame, sym); | |
7899 | break; | |
7900 | } | |
7901 | } | |
7902 | } | |
230d2906 | 7903 | catch (const gdb_exception_error &e) |
492d29ea PA |
7904 | { |
7905 | } | |
186c406b TT |
7906 | } |
7907 | ||
104c1213 | 7908 | static void |
22bcd14b | 7909 | stop_waiting (struct execution_control_state *ecs) |
104c1213 | 7910 | { |
527159b7 | 7911 | if (debug_infrun) |
22bcd14b | 7912 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_waiting\n"); |
527159b7 | 7913 | |
cd0fc7c3 SS |
7914 | /* Let callers know we don't want to wait for the inferior anymore. */ |
7915 | ecs->wait_some_more = 0; | |
fbea99ea | 7916 | |
53cccef1 | 7917 | /* If all-stop, but there exists a non-stop target, stop all |
fbea99ea | 7918 | threads now that we're presenting the stop to the user. */ |
53cccef1 | 7919 | if (!non_stop && exists_non_stop_target ()) |
fbea99ea | 7920 | stop_all_threads (); |
cd0fc7c3 SS |
7921 | } |
7922 | ||
4d9d9d04 PA |
7923 | /* Like keep_going, but passes the signal to the inferior, even if the |
7924 | signal is set to nopass. */ | |
d4f3574e SS |
7925 | |
7926 | static void | |
4d9d9d04 | 7927 | keep_going_pass_signal (struct execution_control_state *ecs) |
d4f3574e | 7928 | { |
d7e15655 | 7929 | gdb_assert (ecs->event_thread->ptid == inferior_ptid); |
372316f1 | 7930 | gdb_assert (!ecs->event_thread->resumed); |
4d9d9d04 | 7931 | |
d4f3574e | 7932 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b | 7933 | ecs->event_thread->prev_pc |
fc75c28b | 7934 | = regcache_read_pc_protected (get_thread_regcache (ecs->event_thread)); |
d4f3574e | 7935 | |
4d9d9d04 | 7936 | if (ecs->event_thread->control.trap_expected) |
d4f3574e | 7937 | { |
4d9d9d04 PA |
7938 | struct thread_info *tp = ecs->event_thread; |
7939 | ||
7940 | if (debug_infrun) | |
7941 | fprintf_unfiltered (gdb_stdlog, | |
7942 | "infrun: %s has trap_expected set, " | |
7943 | "resuming to collect trap\n", | |
a068643d | 7944 | target_pid_to_str (tp->ptid).c_str ()); |
4d9d9d04 | 7945 | |
a9ba6bae PA |
7946 | /* We haven't yet gotten our trap, and either: intercepted a |
7947 | non-signal event (e.g., a fork); or took a signal which we | |
7948 | are supposed to pass through to the inferior. Simply | |
7949 | continue. */ | |
64ce06e4 | 7950 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e | 7951 | } |
372316f1 PA |
7952 | else if (step_over_info_valid_p ()) |
7953 | { | |
7954 | /* Another thread is stepping over a breakpoint in-line. If | |
7955 | this thread needs a step-over too, queue the request. In | |
7956 | either case, this resume must be deferred for later. */ | |
7957 | struct thread_info *tp = ecs->event_thread; | |
7958 | ||
7959 | if (ecs->hit_singlestep_breakpoint | |
7960 | || thread_still_needs_step_over (tp)) | |
7961 | { | |
7962 | if (debug_infrun) | |
7963 | fprintf_unfiltered (gdb_stdlog, | |
7964 | "infrun: step-over already in progress: " | |
7965 | "step-over for %s deferred\n", | |
a068643d | 7966 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 PA |
7967 | thread_step_over_chain_enqueue (tp); |
7968 | } | |
7969 | else | |
7970 | { | |
7971 | if (debug_infrun) | |
7972 | fprintf_unfiltered (gdb_stdlog, | |
7973 | "infrun: step-over in progress: " | |
7974 | "resume of %s deferred\n", | |
a068643d | 7975 | target_pid_to_str (tp->ptid).c_str ()); |
372316f1 | 7976 | } |
372316f1 | 7977 | } |
d4f3574e SS |
7978 | else |
7979 | { | |
31e77af2 | 7980 | struct regcache *regcache = get_current_regcache (); |
963f9c80 PA |
7981 | int remove_bp; |
7982 | int remove_wps; | |
8d297bbf | 7983 | step_over_what step_what; |
31e77af2 | 7984 | |
d4f3574e | 7985 | /* Either the trap was not expected, but we are continuing |
a9ba6bae PA |
7986 | anyway (if we got a signal, the user asked it be passed to |
7987 | the child) | |
7988 | -- or -- | |
7989 | We got our expected trap, but decided we should resume from | |
7990 | it. | |
d4f3574e | 7991 | |
a9ba6bae | 7992 | We're going to run this baby now! |
d4f3574e | 7993 | |
c36b740a VP |
7994 | Note that insert_breakpoints won't try to re-insert |
7995 | already inserted breakpoints. Therefore, we don't | |
7996 | care if breakpoints were already inserted, or not. */ | |
a9ba6bae | 7997 | |
31e77af2 PA |
7998 | /* If we need to step over a breakpoint, and we're not using |
7999 | displaced stepping to do so, insert all breakpoints | |
8000 | (watchpoints, etc.) but the one we're stepping over, step one | |
8001 | instruction, and then re-insert the breakpoint when that step | |
8002 | is finished. */ | |
963f9c80 | 8003 | |
6c4cfb24 PA |
8004 | step_what = thread_still_needs_step_over (ecs->event_thread); |
8005 | ||
963f9c80 | 8006 | remove_bp = (ecs->hit_singlestep_breakpoint |
6c4cfb24 PA |
8007 | || (step_what & STEP_OVER_BREAKPOINT)); |
8008 | remove_wps = (step_what & STEP_OVER_WATCHPOINT); | |
963f9c80 | 8009 | |
cb71640d PA |
8010 | /* We can't use displaced stepping if we need to step past a |
8011 | watchpoint. The instruction copied to the scratch pad would | |
8012 | still trigger the watchpoint. */ | |
8013 | if (remove_bp | |
3fc8eb30 | 8014 | && (remove_wps || !use_displaced_stepping (ecs->event_thread))) |
45e8c884 | 8015 | { |
a01bda52 | 8016 | set_step_over_info (regcache->aspace (), |
21edc42f YQ |
8017 | regcache_read_pc (regcache), remove_wps, |
8018 | ecs->event_thread->global_num); | |
45e8c884 | 8019 | } |
963f9c80 | 8020 | else if (remove_wps) |
21edc42f | 8021 | set_step_over_info (NULL, 0, remove_wps, -1); |
372316f1 PA |
8022 | |
8023 | /* If we now need to do an in-line step-over, we need to stop | |
8024 | all other threads. Note this must be done before | |
8025 | insert_breakpoints below, because that removes the breakpoint | |
8026 | we're about to step over, otherwise other threads could miss | |
8027 | it. */ | |
fbea99ea | 8028 | if (step_over_info_valid_p () && target_is_non_stop_p ()) |
372316f1 | 8029 | stop_all_threads (); |
abbb1732 | 8030 | |
31e77af2 | 8031 | /* Stop stepping if inserting breakpoints fails. */ |
a70b8144 | 8032 | try |
31e77af2 PA |
8033 | { |
8034 | insert_breakpoints (); | |
8035 | } | |
230d2906 | 8036 | catch (const gdb_exception_error &e) |
31e77af2 PA |
8037 | { |
8038 | exception_print (gdb_stderr, e); | |
22bcd14b | 8039 | stop_waiting (ecs); |
bdf2a94a | 8040 | clear_step_over_info (); |
31e77af2 | 8041 | return; |
d4f3574e SS |
8042 | } |
8043 | ||
963f9c80 | 8044 | ecs->event_thread->control.trap_expected = (remove_bp || remove_wps); |
d4f3574e | 8045 | |
64ce06e4 | 8046 | resume (ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
8047 | } |
8048 | ||
488f131b | 8049 | prepare_to_wait (ecs); |
d4f3574e SS |
8050 | } |
8051 | ||
4d9d9d04 PA |
8052 | /* Called when we should continue running the inferior, because the |
8053 | current event doesn't cause a user visible stop. This does the | |
8054 | resuming part; waiting for the next event is done elsewhere. */ | |
8055 | ||
8056 | static void | |
8057 | keep_going (struct execution_control_state *ecs) | |
8058 | { | |
8059 | if (ecs->event_thread->control.trap_expected | |
8060 | && ecs->event_thread->suspend.stop_signal == GDB_SIGNAL_TRAP) | |
8061 | ecs->event_thread->control.trap_expected = 0; | |
8062 | ||
8063 | if (!signal_program[ecs->event_thread->suspend.stop_signal]) | |
8064 | ecs->event_thread->suspend.stop_signal = GDB_SIGNAL_0; | |
8065 | keep_going_pass_signal (ecs); | |
8066 | } | |
8067 | ||
104c1213 JM |
8068 | /* This function normally comes after a resume, before |
8069 | handle_inferior_event exits. It takes care of any last bits of | |
8070 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 8071 | |
104c1213 JM |
8072 | static void |
8073 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 8074 | { |
527159b7 | 8075 | if (debug_infrun) |
8a9de0e4 | 8076 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 8077 | |
104c1213 | 8078 | ecs->wait_some_more = 1; |
0b333c5e PA |
8079 | |
8080 | if (!target_is_async_p ()) | |
8081 | mark_infrun_async_event_handler (); | |
c906108c | 8082 | } |
11cf8741 | 8083 | |
fd664c91 | 8084 | /* We are done with the step range of a step/next/si/ni command. |
b57bacec | 8085 | Called once for each n of a "step n" operation. */ |
fd664c91 PA |
8086 | |
8087 | static void | |
bdc36728 | 8088 | end_stepping_range (struct execution_control_state *ecs) |
fd664c91 | 8089 | { |
bdc36728 | 8090 | ecs->event_thread->control.stop_step = 1; |
bdc36728 | 8091 | stop_waiting (ecs); |
fd664c91 PA |
8092 | } |
8093 | ||
33d62d64 JK |
8094 | /* Several print_*_reason functions to print why the inferior has stopped. |
8095 | We always print something when the inferior exits, or receives a signal. | |
8096 | The rest of the cases are dealt with later on in normal_stop and | |
8097 | print_it_typical. Ideally there should be a call to one of these | |
8098 | print_*_reason functions functions from handle_inferior_event each time | |
22bcd14b | 8099 | stop_waiting is called. |
33d62d64 | 8100 | |
fd664c91 PA |
8101 | Note that we don't call these directly, instead we delegate that to |
8102 | the interpreters, through observers. Interpreters then call these | |
8103 | with whatever uiout is right. */ | |
33d62d64 | 8104 | |
fd664c91 PA |
8105 | void |
8106 | print_end_stepping_range_reason (struct ui_out *uiout) | |
33d62d64 | 8107 | { |
fd664c91 | 8108 | /* For CLI-like interpreters, print nothing. */ |
33d62d64 | 8109 | |
112e8700 | 8110 | if (uiout->is_mi_like_p ()) |
fd664c91 | 8111 | { |
112e8700 | 8112 | uiout->field_string ("reason", |
fd664c91 PA |
8113 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
8114 | } | |
8115 | } | |
33d62d64 | 8116 | |
fd664c91 PA |
8117 | void |
8118 | print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
11cf8741 | 8119 | { |
33d62d64 | 8120 | annotate_signalled (); |
112e8700 SM |
8121 | if (uiout->is_mi_like_p ()) |
8122 | uiout->field_string | |
8123 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8124 | uiout->text ("\nProgram terminated with signal "); | |
33d62d64 | 8125 | annotate_signal_name (); |
112e8700 | 8126 | uiout->field_string ("signal-name", |
2ea28649 | 8127 | gdb_signal_to_name (siggnal)); |
33d62d64 | 8128 | annotate_signal_name_end (); |
112e8700 | 8129 | uiout->text (", "); |
33d62d64 | 8130 | annotate_signal_string (); |
112e8700 | 8131 | uiout->field_string ("signal-meaning", |
2ea28649 | 8132 | gdb_signal_to_string (siggnal)); |
33d62d64 | 8133 | annotate_signal_string_end (); |
112e8700 SM |
8134 | uiout->text (".\n"); |
8135 | uiout->text ("The program no longer exists.\n"); | |
33d62d64 JK |
8136 | } |
8137 | ||
fd664c91 PA |
8138 | void |
8139 | print_exited_reason (struct ui_out *uiout, int exitstatus) | |
33d62d64 | 8140 | { |
fda326dd | 8141 | struct inferior *inf = current_inferior (); |
a068643d | 8142 | std::string pidstr = target_pid_to_str (ptid_t (inf->pid)); |
fda326dd | 8143 | |
33d62d64 JK |
8144 | annotate_exited (exitstatus); |
8145 | if (exitstatus) | |
8146 | { | |
112e8700 SM |
8147 | if (uiout->is_mi_like_p ()) |
8148 | uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED)); | |
6a831f06 PA |
8149 | std::string exit_code_str |
8150 | = string_printf ("0%o", (unsigned int) exitstatus); | |
8151 | uiout->message ("[Inferior %s (%s) exited with code %pF]\n", | |
8152 | plongest (inf->num), pidstr.c_str (), | |
8153 | string_field ("exit-code", exit_code_str.c_str ())); | |
33d62d64 JK |
8154 | } |
8155 | else | |
11cf8741 | 8156 | { |
112e8700 SM |
8157 | if (uiout->is_mi_like_p ()) |
8158 | uiout->field_string | |
8159 | ("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
6a831f06 PA |
8160 | uiout->message ("[Inferior %s (%s) exited normally]\n", |
8161 | plongest (inf->num), pidstr.c_str ()); | |
33d62d64 | 8162 | } |
33d62d64 JK |
8163 | } |
8164 | ||
012b3a21 WT |
8165 | /* Some targets/architectures can do extra processing/display of |
8166 | segmentation faults. E.g., Intel MPX boundary faults. | |
8167 | Call the architecture dependent function to handle the fault. */ | |
8168 | ||
8169 | static void | |
8170 | handle_segmentation_fault (struct ui_out *uiout) | |
8171 | { | |
8172 | struct regcache *regcache = get_current_regcache (); | |
ac7936df | 8173 | struct gdbarch *gdbarch = regcache->arch (); |
012b3a21 WT |
8174 | |
8175 | if (gdbarch_handle_segmentation_fault_p (gdbarch)) | |
8176 | gdbarch_handle_segmentation_fault (gdbarch, uiout); | |
8177 | } | |
8178 | ||
fd664c91 PA |
8179 | void |
8180 | print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal) | |
33d62d64 | 8181 | { |
f303dbd6 PA |
8182 | struct thread_info *thr = inferior_thread (); |
8183 | ||
33d62d64 JK |
8184 | annotate_signal (); |
8185 | ||
112e8700 | 8186 | if (uiout->is_mi_like_p ()) |
f303dbd6 PA |
8187 | ; |
8188 | else if (show_thread_that_caused_stop ()) | |
33d62d64 | 8189 | { |
f303dbd6 | 8190 | const char *name; |
33d62d64 | 8191 | |
112e8700 | 8192 | uiout->text ("\nThread "); |
33eca680 | 8193 | uiout->field_string ("thread-id", print_thread_id (thr)); |
f303dbd6 PA |
8194 | |
8195 | name = thr->name != NULL ? thr->name : target_thread_name (thr); | |
8196 | if (name != NULL) | |
8197 | { | |
112e8700 | 8198 | uiout->text (" \""); |
33eca680 | 8199 | uiout->field_string ("name", name); |
112e8700 | 8200 | uiout->text ("\""); |
f303dbd6 | 8201 | } |
33d62d64 | 8202 | } |
f303dbd6 | 8203 | else |
112e8700 | 8204 | uiout->text ("\nProgram"); |
f303dbd6 | 8205 | |
112e8700 SM |
8206 | if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ()) |
8207 | uiout->text (" stopped"); | |
33d62d64 JK |
8208 | else |
8209 | { | |
112e8700 | 8210 | uiout->text (" received signal "); |
8b93c638 | 8211 | annotate_signal_name (); |
112e8700 SM |
8212 | if (uiout->is_mi_like_p ()) |
8213 | uiout->field_string | |
8214 | ("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
8215 | uiout->field_string ("signal-name", gdb_signal_to_name (siggnal)); | |
8b93c638 | 8216 | annotate_signal_name_end (); |
112e8700 | 8217 | uiout->text (", "); |
8b93c638 | 8218 | annotate_signal_string (); |
112e8700 | 8219 | uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal)); |
012b3a21 WT |
8220 | |
8221 | if (siggnal == GDB_SIGNAL_SEGV) | |
8222 | handle_segmentation_fault (uiout); | |
8223 | ||
8b93c638 | 8224 | annotate_signal_string_end (); |
33d62d64 | 8225 | } |
112e8700 | 8226 | uiout->text (".\n"); |
33d62d64 | 8227 | } |
252fbfc8 | 8228 | |
fd664c91 PA |
8229 | void |
8230 | print_no_history_reason (struct ui_out *uiout) | |
33d62d64 | 8231 | { |
112e8700 | 8232 | uiout->text ("\nNo more reverse-execution history.\n"); |
11cf8741 | 8233 | } |
43ff13b4 | 8234 | |
0c7e1a46 PA |
8235 | /* Print current location without a level number, if we have changed |
8236 | functions or hit a breakpoint. Print source line if we have one. | |
8237 | bpstat_print contains the logic deciding in detail what to print, | |
8238 | based on the event(s) that just occurred. */ | |
8239 | ||
243a9253 PA |
8240 | static void |
8241 | print_stop_location (struct target_waitstatus *ws) | |
0c7e1a46 PA |
8242 | { |
8243 | int bpstat_ret; | |
f486487f | 8244 | enum print_what source_flag; |
0c7e1a46 PA |
8245 | int do_frame_printing = 1; |
8246 | struct thread_info *tp = inferior_thread (); | |
8247 | ||
8248 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws->kind); | |
8249 | switch (bpstat_ret) | |
8250 | { | |
8251 | case PRINT_UNKNOWN: | |
8252 | /* FIXME: cagney/2002-12-01: Given that a frame ID does (or | |
8253 | should) carry around the function and does (or should) use | |
8254 | that when doing a frame comparison. */ | |
8255 | if (tp->control.stop_step | |
8256 | && frame_id_eq (tp->control.step_frame_id, | |
8257 | get_frame_id (get_current_frame ())) | |
f2ffa92b PA |
8258 | && (tp->control.step_start_function |
8259 | == find_pc_function (tp->suspend.stop_pc))) | |
0c7e1a46 PA |
8260 | { |
8261 | /* Finished step, just print source line. */ | |
8262 | source_flag = SRC_LINE; | |
8263 | } | |
8264 | else | |
8265 | { | |
8266 | /* Print location and source line. */ | |
8267 | source_flag = SRC_AND_LOC; | |
8268 | } | |
8269 | break; | |
8270 | case PRINT_SRC_AND_LOC: | |
8271 | /* Print location and source line. */ | |
8272 | source_flag = SRC_AND_LOC; | |
8273 | break; | |
8274 | case PRINT_SRC_ONLY: | |
8275 | source_flag = SRC_LINE; | |
8276 | break; | |
8277 | case PRINT_NOTHING: | |
8278 | /* Something bogus. */ | |
8279 | source_flag = SRC_LINE; | |
8280 | do_frame_printing = 0; | |
8281 | break; | |
8282 | default: | |
8283 | internal_error (__FILE__, __LINE__, _("Unknown value.")); | |
8284 | } | |
8285 | ||
8286 | /* The behavior of this routine with respect to the source | |
8287 | flag is: | |
8288 | SRC_LINE: Print only source line | |
8289 | LOCATION: Print only location | |
8290 | SRC_AND_LOC: Print location and source line. */ | |
8291 | if (do_frame_printing) | |
8292 | print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1); | |
243a9253 PA |
8293 | } |
8294 | ||
243a9253 PA |
8295 | /* See infrun.h. */ |
8296 | ||
8297 | void | |
4c7d57e7 | 8298 | print_stop_event (struct ui_out *uiout, bool displays) |
243a9253 | 8299 | { |
243a9253 | 8300 | struct target_waitstatus last; |
243a9253 PA |
8301 | struct thread_info *tp; |
8302 | ||
5b6d1e4f | 8303 | get_last_target_status (nullptr, nullptr, &last); |
243a9253 | 8304 | |
67ad9399 TT |
8305 | { |
8306 | scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout); | |
0c7e1a46 | 8307 | |
67ad9399 | 8308 | print_stop_location (&last); |
243a9253 | 8309 | |
67ad9399 | 8310 | /* Display the auto-display expressions. */ |
4c7d57e7 TT |
8311 | if (displays) |
8312 | do_displays (); | |
67ad9399 | 8313 | } |
243a9253 PA |
8314 | |
8315 | tp = inferior_thread (); | |
8316 | if (tp->thread_fsm != NULL | |
46e3ed7f | 8317 | && tp->thread_fsm->finished_p ()) |
243a9253 PA |
8318 | { |
8319 | struct return_value_info *rv; | |
8320 | ||
46e3ed7f | 8321 | rv = tp->thread_fsm->return_value (); |
243a9253 PA |
8322 | if (rv != NULL) |
8323 | print_return_value (uiout, rv); | |
8324 | } | |
0c7e1a46 PA |
8325 | } |
8326 | ||
388a7084 PA |
8327 | /* See infrun.h. */ |
8328 | ||
8329 | void | |
8330 | maybe_remove_breakpoints (void) | |
8331 | { | |
8332 | if (!breakpoints_should_be_inserted_now () && target_has_execution) | |
8333 | { | |
8334 | if (remove_breakpoints ()) | |
8335 | { | |
223ffa71 | 8336 | target_terminal::ours_for_output (); |
388a7084 PA |
8337 | printf_filtered (_("Cannot remove breakpoints because " |
8338 | "program is no longer writable.\nFurther " | |
8339 | "execution is probably impossible.\n")); | |
8340 | } | |
8341 | } | |
8342 | } | |
8343 | ||
4c2f2a79 PA |
8344 | /* The execution context that just caused a normal stop. */ |
8345 | ||
8346 | struct stop_context | |
8347 | { | |
2d844eaf TT |
8348 | stop_context (); |
8349 | ~stop_context (); | |
8350 | ||
8351 | DISABLE_COPY_AND_ASSIGN (stop_context); | |
8352 | ||
8353 | bool changed () const; | |
8354 | ||
4c2f2a79 PA |
8355 | /* The stop ID. */ |
8356 | ULONGEST stop_id; | |
c906108c | 8357 | |
4c2f2a79 | 8358 | /* The event PTID. */ |
c906108c | 8359 | |
4c2f2a79 PA |
8360 | ptid_t ptid; |
8361 | ||
8362 | /* If stopp for a thread event, this is the thread that caused the | |
8363 | stop. */ | |
8364 | struct thread_info *thread; | |
8365 | ||
8366 | /* The inferior that caused the stop. */ | |
8367 | int inf_num; | |
8368 | }; | |
8369 | ||
2d844eaf | 8370 | /* Initializes a new stop context. If stopped for a thread event, this |
4c2f2a79 PA |
8371 | takes a strong reference to the thread. */ |
8372 | ||
2d844eaf | 8373 | stop_context::stop_context () |
4c2f2a79 | 8374 | { |
2d844eaf TT |
8375 | stop_id = get_stop_id (); |
8376 | ptid = inferior_ptid; | |
8377 | inf_num = current_inferior ()->num; | |
4c2f2a79 | 8378 | |
d7e15655 | 8379 | if (inferior_ptid != null_ptid) |
4c2f2a79 PA |
8380 | { |
8381 | /* Take a strong reference so that the thread can't be deleted | |
8382 | yet. */ | |
2d844eaf TT |
8383 | thread = inferior_thread (); |
8384 | thread->incref (); | |
4c2f2a79 PA |
8385 | } |
8386 | else | |
2d844eaf | 8387 | thread = NULL; |
4c2f2a79 PA |
8388 | } |
8389 | ||
8390 | /* Release a stop context previously created with save_stop_context. | |
8391 | Releases the strong reference to the thread as well. */ | |
8392 | ||
2d844eaf | 8393 | stop_context::~stop_context () |
4c2f2a79 | 8394 | { |
2d844eaf TT |
8395 | if (thread != NULL) |
8396 | thread->decref (); | |
4c2f2a79 PA |
8397 | } |
8398 | ||
8399 | /* Return true if the current context no longer matches the saved stop | |
8400 | context. */ | |
8401 | ||
2d844eaf TT |
8402 | bool |
8403 | stop_context::changed () const | |
8404 | { | |
8405 | if (ptid != inferior_ptid) | |
8406 | return true; | |
8407 | if (inf_num != current_inferior ()->num) | |
8408 | return true; | |
8409 | if (thread != NULL && thread->state != THREAD_STOPPED) | |
8410 | return true; | |
8411 | if (get_stop_id () != stop_id) | |
8412 | return true; | |
8413 | return false; | |
4c2f2a79 PA |
8414 | } |
8415 | ||
8416 | /* See infrun.h. */ | |
8417 | ||
8418 | int | |
96baa820 | 8419 | normal_stop (void) |
c906108c | 8420 | { |
73b65bb0 | 8421 | struct target_waitstatus last; |
73b65bb0 | 8422 | |
5b6d1e4f | 8423 | get_last_target_status (nullptr, nullptr, &last); |
73b65bb0 | 8424 | |
4c2f2a79 PA |
8425 | new_stop_id (); |
8426 | ||
29f49a6a PA |
8427 | /* If an exception is thrown from this point on, make sure to |
8428 | propagate GDB's knowledge of the executing state to the | |
8429 | frontend/user running state. A QUIT is an easy exception to see | |
8430 | here, so do this before any filtered output. */ | |
731f534f | 8431 | |
5b6d1e4f | 8432 | ptid_t finish_ptid = null_ptid; |
731f534f | 8433 | |
c35b1492 | 8434 | if (!non_stop) |
5b6d1e4f | 8435 | finish_ptid = minus_one_ptid; |
e1316e60 PA |
8436 | else if (last.kind == TARGET_WAITKIND_SIGNALLED |
8437 | || last.kind == TARGET_WAITKIND_EXITED) | |
8438 | { | |
8439 | /* On some targets, we may still have live threads in the | |
8440 | inferior when we get a process exit event. E.g., for | |
8441 | "checkpoint", when the current checkpoint/fork exits, | |
8442 | linux-fork.c automatically switches to another fork from | |
8443 | within target_mourn_inferior. */ | |
731f534f | 8444 | if (inferior_ptid != null_ptid) |
5b6d1e4f | 8445 | finish_ptid = ptid_t (inferior_ptid.pid ()); |
e1316e60 PA |
8446 | } |
8447 | else if (last.kind != TARGET_WAITKIND_NO_RESUMED) | |
5b6d1e4f PA |
8448 | finish_ptid = inferior_ptid; |
8449 | ||
8450 | gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state; | |
8451 | if (finish_ptid != null_ptid) | |
8452 | { | |
8453 | maybe_finish_thread_state.emplace | |
8454 | (user_visible_resume_target (finish_ptid), finish_ptid); | |
8455 | } | |
29f49a6a | 8456 | |
b57bacec PA |
8457 | /* As we're presenting a stop, and potentially removing breakpoints, |
8458 | update the thread list so we can tell whether there are threads | |
8459 | running on the target. With target remote, for example, we can | |
8460 | only learn about new threads when we explicitly update the thread | |
8461 | list. Do this before notifying the interpreters about signal | |
8462 | stops, end of stepping ranges, etc., so that the "new thread" | |
8463 | output is emitted before e.g., "Program received signal FOO", | |
8464 | instead of after. */ | |
8465 | update_thread_list (); | |
8466 | ||
8467 | if (last.kind == TARGET_WAITKIND_STOPPED && stopped_by_random_signal) | |
76727919 | 8468 | gdb::observers::signal_received.notify (inferior_thread ()->suspend.stop_signal); |
b57bacec | 8469 | |
c906108c SS |
8470 | /* As with the notification of thread events, we want to delay |
8471 | notifying the user that we've switched thread context until | |
8472 | the inferior actually stops. | |
8473 | ||
73b65bb0 DJ |
8474 | There's no point in saying anything if the inferior has exited. |
8475 | Note that SIGNALLED here means "exited with a signal", not | |
b65dc60b PA |
8476 | "received a signal". |
8477 | ||
8478 | Also skip saying anything in non-stop mode. In that mode, as we | |
8479 | don't want GDB to switch threads behind the user's back, to avoid | |
8480 | races where the user is typing a command to apply to thread x, | |
8481 | but GDB switches to thread y before the user finishes entering | |
8482 | the command, fetch_inferior_event installs a cleanup to restore | |
8483 | the current thread back to the thread the user had selected right | |
8484 | after this event is handled, so we're not really switching, only | |
8485 | informing of a stop. */ | |
4f8d22e3 | 8486 | if (!non_stop |
731f534f | 8487 | && previous_inferior_ptid != inferior_ptid |
73b65bb0 DJ |
8488 | && target_has_execution |
8489 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
8490 | && last.kind != TARGET_WAITKIND_EXITED |
8491 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c | 8492 | { |
0e454242 | 8493 | SWITCH_THRU_ALL_UIS () |
3b12939d | 8494 | { |
223ffa71 | 8495 | target_terminal::ours_for_output (); |
3b12939d | 8496 | printf_filtered (_("[Switching to %s]\n"), |
a068643d | 8497 | target_pid_to_str (inferior_ptid).c_str ()); |
3b12939d PA |
8498 | annotate_thread_changed (); |
8499 | } | |
39f77062 | 8500 | previous_inferior_ptid = inferior_ptid; |
c906108c | 8501 | } |
c906108c | 8502 | |
0e5bf2a8 PA |
8503 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
8504 | { | |
0e454242 | 8505 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8506 | if (current_ui->prompt_state == PROMPT_BLOCKED) |
8507 | { | |
223ffa71 | 8508 | target_terminal::ours_for_output (); |
3b12939d PA |
8509 | printf_filtered (_("No unwaited-for children left.\n")); |
8510 | } | |
0e5bf2a8 PA |
8511 | } |
8512 | ||
b57bacec | 8513 | /* Note: this depends on the update_thread_list call above. */ |
388a7084 | 8514 | maybe_remove_breakpoints (); |
c906108c | 8515 | |
c906108c SS |
8516 | /* If an auto-display called a function and that got a signal, |
8517 | delete that auto-display to avoid an infinite recursion. */ | |
8518 | ||
8519 | if (stopped_by_random_signal) | |
8520 | disable_current_display (); | |
8521 | ||
0e454242 | 8522 | SWITCH_THRU_ALL_UIS () |
3b12939d PA |
8523 | { |
8524 | async_enable_stdin (); | |
8525 | } | |
c906108c | 8526 | |
388a7084 | 8527 | /* Let the user/frontend see the threads as stopped. */ |
731f534f | 8528 | maybe_finish_thread_state.reset (); |
388a7084 PA |
8529 | |
8530 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
8531 | and current location is based on that. Handle the case where the | |
8532 | dummy call is returning after being stopped. E.g. the dummy call | |
8533 | previously hit a breakpoint. (If the dummy call returns | |
8534 | normally, we won't reach here.) Do this before the stop hook is | |
8535 | run, so that it doesn't get to see the temporary dummy frame, | |
8536 | which is not where we'll present the stop. */ | |
8537 | if (has_stack_frames ()) | |
8538 | { | |
8539 | if (stop_stack_dummy == STOP_STACK_DUMMY) | |
8540 | { | |
8541 | /* Pop the empty frame that contains the stack dummy. This | |
8542 | also restores inferior state prior to the call (struct | |
8543 | infcall_suspend_state). */ | |
8544 | struct frame_info *frame = get_current_frame (); | |
8545 | ||
8546 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); | |
8547 | frame_pop (frame); | |
8548 | /* frame_pop calls reinit_frame_cache as the last thing it | |
8549 | does which means there's now no selected frame. */ | |
8550 | } | |
8551 | ||
8552 | select_frame (get_current_frame ()); | |
8553 | ||
8554 | /* Set the current source location. */ | |
8555 | set_current_sal_from_frame (get_current_frame ()); | |
8556 | } | |
dd7e2d2b PA |
8557 | |
8558 | /* Look up the hook_stop and run it (CLI internally handles problem | |
8559 | of stop_command's pre-hook not existing). */ | |
4c2f2a79 PA |
8560 | if (stop_command != NULL) |
8561 | { | |
2d844eaf | 8562 | stop_context saved_context; |
4c2f2a79 | 8563 | |
a70b8144 | 8564 | try |
bf469271 PA |
8565 | { |
8566 | execute_cmd_pre_hook (stop_command); | |
8567 | } | |
230d2906 | 8568 | catch (const gdb_exception &ex) |
bf469271 PA |
8569 | { |
8570 | exception_fprintf (gdb_stderr, ex, | |
8571 | "Error while running hook_stop:\n"); | |
8572 | } | |
4c2f2a79 PA |
8573 | |
8574 | /* If the stop hook resumes the target, then there's no point in | |
8575 | trying to notify about the previous stop; its context is | |
8576 | gone. Likewise if the command switches thread or inferior -- | |
8577 | the observers would print a stop for the wrong | |
8578 | thread/inferior. */ | |
2d844eaf TT |
8579 | if (saved_context.changed ()) |
8580 | return 1; | |
4c2f2a79 | 8581 | } |
dd7e2d2b | 8582 | |
388a7084 PA |
8583 | /* Notify observers about the stop. This is where the interpreters |
8584 | print the stop event. */ | |
d7e15655 | 8585 | if (inferior_ptid != null_ptid) |
76727919 | 8586 | gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat, |
388a7084 PA |
8587 | stop_print_frame); |
8588 | else | |
76727919 | 8589 | gdb::observers::normal_stop.notify (NULL, stop_print_frame); |
347bddb7 | 8590 | |
243a9253 PA |
8591 | annotate_stopped (); |
8592 | ||
48844aa6 PA |
8593 | if (target_has_execution) |
8594 | { | |
8595 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
fe726667 PA |
8596 | && last.kind != TARGET_WAITKIND_EXITED |
8597 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
48844aa6 PA |
8598 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
8599 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 8600 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 8601 | } |
6c95b8df PA |
8602 | |
8603 | /* Try to get rid of automatically added inferiors that are no | |
8604 | longer needed. Keeping those around slows down things linearly. | |
8605 | Note that this never removes the current inferior. */ | |
8606 | prune_inferiors (); | |
4c2f2a79 PA |
8607 | |
8608 | return 0; | |
c906108c | 8609 | } |
c906108c | 8610 | \f |
c5aa993b | 8611 | int |
96baa820 | 8612 | signal_stop_state (int signo) |
c906108c | 8613 | { |
d6b48e9c | 8614 | return signal_stop[signo]; |
c906108c SS |
8615 | } |
8616 | ||
c5aa993b | 8617 | int |
96baa820 | 8618 | signal_print_state (int signo) |
c906108c SS |
8619 | { |
8620 | return signal_print[signo]; | |
8621 | } | |
8622 | ||
c5aa993b | 8623 | int |
96baa820 | 8624 | signal_pass_state (int signo) |
c906108c SS |
8625 | { |
8626 | return signal_program[signo]; | |
8627 | } | |
8628 | ||
2455069d UW |
8629 | static void |
8630 | signal_cache_update (int signo) | |
8631 | { | |
8632 | if (signo == -1) | |
8633 | { | |
a493e3e2 | 8634 | for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++) |
2455069d UW |
8635 | signal_cache_update (signo); |
8636 | ||
8637 | return; | |
8638 | } | |
8639 | ||
8640 | signal_pass[signo] = (signal_stop[signo] == 0 | |
8641 | && signal_print[signo] == 0 | |
ab04a2af TT |
8642 | && signal_program[signo] == 1 |
8643 | && signal_catch[signo] == 0); | |
2455069d UW |
8644 | } |
8645 | ||
488f131b | 8646 | int |
7bda5e4a | 8647 | signal_stop_update (int signo, int state) |
d4f3574e SS |
8648 | { |
8649 | int ret = signal_stop[signo]; | |
abbb1732 | 8650 | |
d4f3574e | 8651 | signal_stop[signo] = state; |
2455069d | 8652 | signal_cache_update (signo); |
d4f3574e SS |
8653 | return ret; |
8654 | } | |
8655 | ||
488f131b | 8656 | int |
7bda5e4a | 8657 | signal_print_update (int signo, int state) |
d4f3574e SS |
8658 | { |
8659 | int ret = signal_print[signo]; | |
abbb1732 | 8660 | |
d4f3574e | 8661 | signal_print[signo] = state; |
2455069d | 8662 | signal_cache_update (signo); |
d4f3574e SS |
8663 | return ret; |
8664 | } | |
8665 | ||
488f131b | 8666 | int |
7bda5e4a | 8667 | signal_pass_update (int signo, int state) |
d4f3574e SS |
8668 | { |
8669 | int ret = signal_program[signo]; | |
abbb1732 | 8670 | |
d4f3574e | 8671 | signal_program[signo] = state; |
2455069d | 8672 | signal_cache_update (signo); |
d4f3574e SS |
8673 | return ret; |
8674 | } | |
8675 | ||
ab04a2af TT |
8676 | /* Update the global 'signal_catch' from INFO and notify the |
8677 | target. */ | |
8678 | ||
8679 | void | |
8680 | signal_catch_update (const unsigned int *info) | |
8681 | { | |
8682 | int i; | |
8683 | ||
8684 | for (i = 0; i < GDB_SIGNAL_LAST; ++i) | |
8685 | signal_catch[i] = info[i] > 0; | |
8686 | signal_cache_update (-1); | |
adc6a863 | 8687 | target_pass_signals (signal_pass); |
ab04a2af TT |
8688 | } |
8689 | ||
c906108c | 8690 | static void |
96baa820 | 8691 | sig_print_header (void) |
c906108c | 8692 | { |
3e43a32a MS |
8693 | printf_filtered (_("Signal Stop\tPrint\tPass " |
8694 | "to program\tDescription\n")); | |
c906108c SS |
8695 | } |
8696 | ||
8697 | static void | |
2ea28649 | 8698 | sig_print_info (enum gdb_signal oursig) |
c906108c | 8699 | { |
2ea28649 | 8700 | const char *name = gdb_signal_to_name (oursig); |
c906108c | 8701 | int name_padding = 13 - strlen (name); |
96baa820 | 8702 | |
c906108c SS |
8703 | if (name_padding <= 0) |
8704 | name_padding = 0; | |
8705 | ||
8706 | printf_filtered ("%s", name); | |
488f131b | 8707 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
8708 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
8709 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
8710 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
2ea28649 | 8711 | printf_filtered ("%s\n", gdb_signal_to_string (oursig)); |
c906108c SS |
8712 | } |
8713 | ||
8714 | /* Specify how various signals in the inferior should be handled. */ | |
8715 | ||
8716 | static void | |
0b39b52e | 8717 | handle_command (const char *args, int from_tty) |
c906108c | 8718 | { |
c906108c | 8719 | int digits, wordlen; |
b926417a | 8720 | int sigfirst, siglast; |
2ea28649 | 8721 | enum gdb_signal oursig; |
c906108c | 8722 | int allsigs; |
c906108c SS |
8723 | |
8724 | if (args == NULL) | |
8725 | { | |
e2e0b3e5 | 8726 | error_no_arg (_("signal to handle")); |
c906108c SS |
8727 | } |
8728 | ||
1777feb0 | 8729 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c | 8730 | |
adc6a863 PA |
8731 | const size_t nsigs = GDB_SIGNAL_LAST; |
8732 | unsigned char sigs[nsigs] {}; | |
c906108c | 8733 | |
1777feb0 | 8734 | /* Break the command line up into args. */ |
c906108c | 8735 | |
773a1edc | 8736 | gdb_argv built_argv (args); |
c906108c SS |
8737 | |
8738 | /* Walk through the args, looking for signal oursigs, signal names, and | |
8739 | actions. Signal numbers and signal names may be interspersed with | |
8740 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 8741 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c | 8742 | |
773a1edc | 8743 | for (char *arg : built_argv) |
c906108c | 8744 | { |
773a1edc TT |
8745 | wordlen = strlen (arg); |
8746 | for (digits = 0; isdigit (arg[digits]); digits++) | |
c906108c SS |
8747 | {; |
8748 | } | |
8749 | allsigs = 0; | |
8750 | sigfirst = siglast = -1; | |
8751 | ||
773a1edc | 8752 | if (wordlen >= 1 && !strncmp (arg, "all", wordlen)) |
c906108c SS |
8753 | { |
8754 | /* Apply action to all signals except those used by the | |
1777feb0 | 8755 | debugger. Silently skip those. */ |
c906108c SS |
8756 | allsigs = 1; |
8757 | sigfirst = 0; | |
8758 | siglast = nsigs - 1; | |
8759 | } | |
773a1edc | 8760 | else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen)) |
c906108c SS |
8761 | { |
8762 | SET_SIGS (nsigs, sigs, signal_stop); | |
8763 | SET_SIGS (nsigs, sigs, signal_print); | |
8764 | } | |
773a1edc | 8765 | else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen)) |
c906108c SS |
8766 | { |
8767 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8768 | } | |
773a1edc | 8769 | else if (wordlen >= 2 && !strncmp (arg, "print", wordlen)) |
c906108c SS |
8770 | { |
8771 | SET_SIGS (nsigs, sigs, signal_print); | |
8772 | } | |
773a1edc | 8773 | else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen)) |
c906108c SS |
8774 | { |
8775 | SET_SIGS (nsigs, sigs, signal_program); | |
8776 | } | |
773a1edc | 8777 | else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen)) |
c906108c SS |
8778 | { |
8779 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8780 | } | |
773a1edc | 8781 | else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen)) |
c906108c SS |
8782 | { |
8783 | SET_SIGS (nsigs, sigs, signal_program); | |
8784 | } | |
773a1edc | 8785 | else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen)) |
c906108c SS |
8786 | { |
8787 | UNSET_SIGS (nsigs, sigs, signal_print); | |
8788 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
8789 | } | |
773a1edc | 8790 | else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen)) |
c906108c SS |
8791 | { |
8792 | UNSET_SIGS (nsigs, sigs, signal_program); | |
8793 | } | |
8794 | else if (digits > 0) | |
8795 | { | |
8796 | /* It is numeric. The numeric signal refers to our own | |
8797 | internal signal numbering from target.h, not to host/target | |
8798 | signal number. This is a feature; users really should be | |
8799 | using symbolic names anyway, and the common ones like | |
8800 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
8801 | ||
8802 | sigfirst = siglast = (int) | |
773a1edc TT |
8803 | gdb_signal_from_command (atoi (arg)); |
8804 | if (arg[digits] == '-') | |
c906108c SS |
8805 | { |
8806 | siglast = (int) | |
773a1edc | 8807 | gdb_signal_from_command (atoi (arg + digits + 1)); |
c906108c SS |
8808 | } |
8809 | if (sigfirst > siglast) | |
8810 | { | |
1777feb0 | 8811 | /* Bet he didn't figure we'd think of this case... */ |
b926417a | 8812 | std::swap (sigfirst, siglast); |
c906108c SS |
8813 | } |
8814 | } | |
8815 | else | |
8816 | { | |
773a1edc | 8817 | oursig = gdb_signal_from_name (arg); |
a493e3e2 | 8818 | if (oursig != GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8819 | { |
8820 | sigfirst = siglast = (int) oursig; | |
8821 | } | |
8822 | else | |
8823 | { | |
8824 | /* Not a number and not a recognized flag word => complain. */ | |
773a1edc | 8825 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg); |
c906108c SS |
8826 | } |
8827 | } | |
8828 | ||
8829 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 8830 | which signals to apply actions to. */ |
c906108c | 8831 | |
b926417a | 8832 | for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++) |
c906108c | 8833 | { |
2ea28649 | 8834 | switch ((enum gdb_signal) signum) |
c906108c | 8835 | { |
a493e3e2 PA |
8836 | case GDB_SIGNAL_TRAP: |
8837 | case GDB_SIGNAL_INT: | |
c906108c SS |
8838 | if (!allsigs && !sigs[signum]) |
8839 | { | |
9e2f0ad4 | 8840 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a | 8841 | Are you sure you want to change it? "), |
2ea28649 | 8842 | gdb_signal_to_name ((enum gdb_signal) signum))) |
c906108c SS |
8843 | { |
8844 | sigs[signum] = 1; | |
8845 | } | |
8846 | else | |
c119e040 | 8847 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
8848 | } |
8849 | break; | |
a493e3e2 PA |
8850 | case GDB_SIGNAL_0: |
8851 | case GDB_SIGNAL_DEFAULT: | |
8852 | case GDB_SIGNAL_UNKNOWN: | |
c906108c SS |
8853 | /* Make sure that "all" doesn't print these. */ |
8854 | break; | |
8855 | default: | |
8856 | sigs[signum] = 1; | |
8857 | break; | |
8858 | } | |
8859 | } | |
c906108c SS |
8860 | } |
8861 | ||
b926417a | 8862 | for (int signum = 0; signum < nsigs; signum++) |
3a031f65 PA |
8863 | if (sigs[signum]) |
8864 | { | |
2455069d | 8865 | signal_cache_update (-1); |
adc6a863 PA |
8866 | target_pass_signals (signal_pass); |
8867 | target_program_signals (signal_program); | |
c906108c | 8868 | |
3a031f65 PA |
8869 | if (from_tty) |
8870 | { | |
8871 | /* Show the results. */ | |
8872 | sig_print_header (); | |
8873 | for (; signum < nsigs; signum++) | |
8874 | if (sigs[signum]) | |
aead7601 | 8875 | sig_print_info ((enum gdb_signal) signum); |
3a031f65 PA |
8876 | } |
8877 | ||
8878 | break; | |
8879 | } | |
c906108c SS |
8880 | } |
8881 | ||
de0bea00 MF |
8882 | /* Complete the "handle" command. */ |
8883 | ||
eb3ff9a5 | 8884 | static void |
de0bea00 | 8885 | handle_completer (struct cmd_list_element *ignore, |
eb3ff9a5 | 8886 | completion_tracker &tracker, |
6f937416 | 8887 | const char *text, const char *word) |
de0bea00 | 8888 | { |
de0bea00 MF |
8889 | static const char * const keywords[] = |
8890 | { | |
8891 | "all", | |
8892 | "stop", | |
8893 | "ignore", | |
8894 | "print", | |
8895 | "pass", | |
8896 | "nostop", | |
8897 | "noignore", | |
8898 | "noprint", | |
8899 | "nopass", | |
8900 | NULL, | |
8901 | }; | |
8902 | ||
eb3ff9a5 PA |
8903 | signal_completer (ignore, tracker, text, word); |
8904 | complete_on_enum (tracker, keywords, word, word); | |
de0bea00 MF |
8905 | } |
8906 | ||
2ea28649 PA |
8907 | enum gdb_signal |
8908 | gdb_signal_from_command (int num) | |
ed01b82c PA |
8909 | { |
8910 | if (num >= 1 && num <= 15) | |
2ea28649 | 8911 | return (enum gdb_signal) num; |
ed01b82c PA |
8912 | error (_("Only signals 1-15 are valid as numeric signals.\n\ |
8913 | Use \"info signals\" for a list of symbolic signals.")); | |
8914 | } | |
8915 | ||
c906108c SS |
8916 | /* Print current contents of the tables set by the handle command. |
8917 | It is possible we should just be printing signals actually used | |
8918 | by the current target (but for things to work right when switching | |
8919 | targets, all signals should be in the signal tables). */ | |
8920 | ||
8921 | static void | |
1d12d88f | 8922 | info_signals_command (const char *signum_exp, int from_tty) |
c906108c | 8923 | { |
2ea28649 | 8924 | enum gdb_signal oursig; |
abbb1732 | 8925 | |
c906108c SS |
8926 | sig_print_header (); |
8927 | ||
8928 | if (signum_exp) | |
8929 | { | |
8930 | /* First see if this is a symbol name. */ | |
2ea28649 | 8931 | oursig = gdb_signal_from_name (signum_exp); |
a493e3e2 | 8932 | if (oursig == GDB_SIGNAL_UNKNOWN) |
c906108c SS |
8933 | { |
8934 | /* No, try numeric. */ | |
8935 | oursig = | |
2ea28649 | 8936 | gdb_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
8937 | } |
8938 | sig_print_info (oursig); | |
8939 | return; | |
8940 | } | |
8941 | ||
8942 | printf_filtered ("\n"); | |
8943 | /* These ugly casts brought to you by the native VAX compiler. */ | |
a493e3e2 PA |
8944 | for (oursig = GDB_SIGNAL_FIRST; |
8945 | (int) oursig < (int) GDB_SIGNAL_LAST; | |
2ea28649 | 8946 | oursig = (enum gdb_signal) ((int) oursig + 1)) |
c906108c SS |
8947 | { |
8948 | QUIT; | |
8949 | ||
a493e3e2 PA |
8950 | if (oursig != GDB_SIGNAL_UNKNOWN |
8951 | && oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0) | |
c906108c SS |
8952 | sig_print_info (oursig); |
8953 | } | |
8954 | ||
3e43a32a MS |
8955 | printf_filtered (_("\nUse the \"handle\" command " |
8956 | "to change these tables.\n")); | |
c906108c | 8957 | } |
4aa995e1 PA |
8958 | |
8959 | /* The $_siginfo convenience variable is a bit special. We don't know | |
8960 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 8961 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
8962 | also dependent on which thread you have selected. |
8963 | ||
8964 | 1. making $_siginfo be an internalvar that creates a new value on | |
8965 | access. | |
8966 | ||
8967 | 2. making the value of $_siginfo be an lval_computed value. */ | |
8968 | ||
8969 | /* This function implements the lval_computed support for reading a | |
8970 | $_siginfo value. */ | |
8971 | ||
8972 | static void | |
8973 | siginfo_value_read (struct value *v) | |
8974 | { | |
8975 | LONGEST transferred; | |
8976 | ||
a911d87a PA |
8977 | /* If we can access registers, so can we access $_siginfo. Likewise |
8978 | vice versa. */ | |
8979 | validate_registers_access (); | |
c709acd1 | 8980 | |
4aa995e1 | 8981 | transferred = |
8b88a78e | 8982 | target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, |
4aa995e1 PA |
8983 | NULL, |
8984 | value_contents_all_raw (v), | |
8985 | value_offset (v), | |
8986 | TYPE_LENGTH (value_type (v))); | |
8987 | ||
8988 | if (transferred != TYPE_LENGTH (value_type (v))) | |
8989 | error (_("Unable to read siginfo")); | |
8990 | } | |
8991 | ||
8992 | /* This function implements the lval_computed support for writing a | |
8993 | $_siginfo value. */ | |
8994 | ||
8995 | static void | |
8996 | siginfo_value_write (struct value *v, struct value *fromval) | |
8997 | { | |
8998 | LONGEST transferred; | |
8999 | ||
a911d87a PA |
9000 | /* If we can access registers, so can we access $_siginfo. Likewise |
9001 | vice versa. */ | |
9002 | validate_registers_access (); | |
c709acd1 | 9003 | |
8b88a78e | 9004 | transferred = target_write (current_top_target (), |
4aa995e1 PA |
9005 | TARGET_OBJECT_SIGNAL_INFO, |
9006 | NULL, | |
9007 | value_contents_all_raw (fromval), | |
9008 | value_offset (v), | |
9009 | TYPE_LENGTH (value_type (fromval))); | |
9010 | ||
9011 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
9012 | error (_("Unable to write siginfo")); | |
9013 | } | |
9014 | ||
c8f2448a | 9015 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
9016 | { |
9017 | siginfo_value_read, | |
9018 | siginfo_value_write | |
9019 | }; | |
9020 | ||
9021 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
9022 | the current thread using architecture GDBARCH. Return a void value |
9023 | if there's no object available. */ | |
4aa995e1 | 9024 | |
2c0b251b | 9025 | static struct value * |
22d2b532 SDJ |
9026 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var, |
9027 | void *ignore) | |
4aa995e1 | 9028 | { |
4aa995e1 | 9029 | if (target_has_stack |
d7e15655 | 9030 | && inferior_ptid != null_ptid |
78267919 | 9031 | && gdbarch_get_siginfo_type_p (gdbarch)) |
4aa995e1 | 9032 | { |
78267919 | 9033 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 9034 | |
78267919 | 9035 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
9036 | } |
9037 | ||
78267919 | 9038 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
9039 | } |
9040 | ||
c906108c | 9041 | \f |
16c381f0 JK |
9042 | /* infcall_suspend_state contains state about the program itself like its |
9043 | registers and any signal it received when it last stopped. | |
9044 | This state must be restored regardless of how the inferior function call | |
9045 | ends (either successfully, or after it hits a breakpoint or signal) | |
9046 | if the program is to properly continue where it left off. */ | |
9047 | ||
6bf78e29 | 9048 | class infcall_suspend_state |
7a292a7a | 9049 | { |
6bf78e29 AB |
9050 | public: |
9051 | /* Capture state from GDBARCH, TP, and REGCACHE that must be restored | |
9052 | once the inferior function call has finished. */ | |
9053 | infcall_suspend_state (struct gdbarch *gdbarch, | |
9054 | const struct thread_info *tp, | |
9055 | struct regcache *regcache) | |
9056 | : m_thread_suspend (tp->suspend), | |
9057 | m_registers (new readonly_detached_regcache (*regcache)) | |
9058 | { | |
9059 | gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data; | |
9060 | ||
9061 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
9062 | { | |
9063 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
9064 | size_t len = TYPE_LENGTH (type); | |
9065 | ||
9066 | siginfo_data.reset ((gdb_byte *) xmalloc (len)); | |
9067 | ||
9068 | if (target_read (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
9069 | siginfo_data.get (), 0, len) != len) | |
9070 | { | |
9071 | /* Errors ignored. */ | |
9072 | siginfo_data.reset (nullptr); | |
9073 | } | |
9074 | } | |
9075 | ||
9076 | if (siginfo_data) | |
9077 | { | |
9078 | m_siginfo_gdbarch = gdbarch; | |
9079 | m_siginfo_data = std::move (siginfo_data); | |
9080 | } | |
9081 | } | |
9082 | ||
9083 | /* Return a pointer to the stored register state. */ | |
16c381f0 | 9084 | |
6bf78e29 AB |
9085 | readonly_detached_regcache *registers () const |
9086 | { | |
9087 | return m_registers.get (); | |
9088 | } | |
9089 | ||
9090 | /* Restores the stored state into GDBARCH, TP, and REGCACHE. */ | |
9091 | ||
9092 | void restore (struct gdbarch *gdbarch, | |
9093 | struct thread_info *tp, | |
9094 | struct regcache *regcache) const | |
9095 | { | |
9096 | tp->suspend = m_thread_suspend; | |
9097 | ||
9098 | if (m_siginfo_gdbarch == gdbarch) | |
9099 | { | |
9100 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
9101 | ||
9102 | /* Errors ignored. */ | |
9103 | target_write (current_top_target (), TARGET_OBJECT_SIGNAL_INFO, NULL, | |
9104 | m_siginfo_data.get (), 0, TYPE_LENGTH (type)); | |
9105 | } | |
9106 | ||
9107 | /* The inferior can be gone if the user types "print exit(0)" | |
9108 | (and perhaps other times). */ | |
9109 | if (target_has_execution) | |
9110 | /* NB: The register write goes through to the target. */ | |
9111 | regcache->restore (registers ()); | |
9112 | } | |
9113 | ||
9114 | private: | |
9115 | /* How the current thread stopped before the inferior function call was | |
9116 | executed. */ | |
9117 | struct thread_suspend_state m_thread_suspend; | |
9118 | ||
9119 | /* The registers before the inferior function call was executed. */ | |
9120 | std::unique_ptr<readonly_detached_regcache> m_registers; | |
1736ad11 | 9121 | |
35515841 | 9122 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
6bf78e29 | 9123 | struct gdbarch *m_siginfo_gdbarch = nullptr; |
1736ad11 JK |
9124 | |
9125 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
9126 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
9127 | content would be invalid. */ | |
6bf78e29 | 9128 | gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data; |
b89667eb DE |
9129 | }; |
9130 | ||
cb524840 TT |
9131 | infcall_suspend_state_up |
9132 | save_infcall_suspend_state () | |
b89667eb | 9133 | { |
b89667eb | 9134 | struct thread_info *tp = inferior_thread (); |
1736ad11 | 9135 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9136 | struct gdbarch *gdbarch = regcache->arch (); |
1736ad11 | 9137 | |
6bf78e29 AB |
9138 | infcall_suspend_state_up inf_state |
9139 | (new struct infcall_suspend_state (gdbarch, tp, regcache)); | |
1736ad11 | 9140 | |
6bf78e29 AB |
9141 | /* Having saved the current state, adjust the thread state, discarding |
9142 | any stop signal information. The stop signal is not useful when | |
9143 | starting an inferior function call, and run_inferior_call will not use | |
9144 | the signal due to its `proceed' call with GDB_SIGNAL_0. */ | |
a493e3e2 | 9145 | tp->suspend.stop_signal = GDB_SIGNAL_0; |
35515841 | 9146 | |
b89667eb DE |
9147 | return inf_state; |
9148 | } | |
9149 | ||
9150 | /* Restore inferior session state to INF_STATE. */ | |
9151 | ||
9152 | void | |
16c381f0 | 9153 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
9154 | { |
9155 | struct thread_info *tp = inferior_thread (); | |
1736ad11 | 9156 | struct regcache *regcache = get_current_regcache (); |
ac7936df | 9157 | struct gdbarch *gdbarch = regcache->arch (); |
b89667eb | 9158 | |
6bf78e29 | 9159 | inf_state->restore (gdbarch, tp, regcache); |
16c381f0 | 9160 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
9161 | } |
9162 | ||
b89667eb | 9163 | void |
16c381f0 | 9164 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb | 9165 | { |
dd848631 | 9166 | delete inf_state; |
b89667eb DE |
9167 | } |
9168 | ||
daf6667d | 9169 | readonly_detached_regcache * |
16c381f0 | 9170 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb | 9171 | { |
6bf78e29 | 9172 | return inf_state->registers (); |
b89667eb DE |
9173 | } |
9174 | ||
16c381f0 JK |
9175 | /* infcall_control_state contains state regarding gdb's control of the |
9176 | inferior itself like stepping control. It also contains session state like | |
9177 | the user's currently selected frame. */ | |
b89667eb | 9178 | |
16c381f0 | 9179 | struct infcall_control_state |
b89667eb | 9180 | { |
16c381f0 JK |
9181 | struct thread_control_state thread_control; |
9182 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
9183 | |
9184 | /* Other fields: */ | |
ee841dd8 TT |
9185 | enum stop_stack_kind stop_stack_dummy = STOP_NONE; |
9186 | int stopped_by_random_signal = 0; | |
7a292a7a | 9187 | |
b89667eb | 9188 | /* ID if the selected frame when the inferior function call was made. */ |
ee841dd8 | 9189 | struct frame_id selected_frame_id {}; |
7a292a7a SS |
9190 | }; |
9191 | ||
c906108c | 9192 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 9193 | connection. */ |
c906108c | 9194 | |
cb524840 TT |
9195 | infcall_control_state_up |
9196 | save_infcall_control_state () | |
c906108c | 9197 | { |
cb524840 | 9198 | infcall_control_state_up inf_status (new struct infcall_control_state); |
4e1c45ea | 9199 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9200 | struct inferior *inf = current_inferior (); |
7a292a7a | 9201 | |
16c381f0 JK |
9202 | inf_status->thread_control = tp->control; |
9203 | inf_status->inferior_control = inf->control; | |
d82142e2 | 9204 | |
8358c15c | 9205 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 9206 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 9207 | |
16c381f0 JK |
9208 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
9209 | chain. If caller's caller is walking the chain, they'll be happier if we | |
9210 | hand them back the original chain when restore_infcall_control_state is | |
9211 | called. */ | |
9212 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
9213 | |
9214 | /* Other fields: */ | |
9215 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
9216 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
c5aa993b | 9217 | |
206415a3 | 9218 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 9219 | |
7a292a7a | 9220 | return inf_status; |
c906108c SS |
9221 | } |
9222 | ||
bf469271 PA |
9223 | static void |
9224 | restore_selected_frame (const frame_id &fid) | |
c906108c | 9225 | { |
bf469271 | 9226 | frame_info *frame = frame_find_by_id (fid); |
c906108c | 9227 | |
aa0cd9c1 AC |
9228 | /* If inf_status->selected_frame_id is NULL, there was no previously |
9229 | selected frame. */ | |
101dcfbe | 9230 | if (frame == NULL) |
c906108c | 9231 | { |
8a3fe4f8 | 9232 | warning (_("Unable to restore previously selected frame.")); |
bf469271 | 9233 | return; |
c906108c SS |
9234 | } |
9235 | ||
0f7d239c | 9236 | select_frame (frame); |
c906108c SS |
9237 | } |
9238 | ||
b89667eb DE |
9239 | /* Restore inferior session state to INF_STATUS. */ |
9240 | ||
c906108c | 9241 | void |
16c381f0 | 9242 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 9243 | { |
4e1c45ea | 9244 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 9245 | struct inferior *inf = current_inferior (); |
4e1c45ea | 9246 | |
8358c15c JK |
9247 | if (tp->control.step_resume_breakpoint) |
9248 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
9249 | ||
5b79abe7 TT |
9250 | if (tp->control.exception_resume_breakpoint) |
9251 | tp->control.exception_resume_breakpoint->disposition | |
9252 | = disp_del_at_next_stop; | |
9253 | ||
d82142e2 | 9254 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 9255 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 9256 | |
16c381f0 JK |
9257 | tp->control = inf_status->thread_control; |
9258 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
9259 | |
9260 | /* Other fields: */ | |
9261 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
9262 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
c906108c | 9263 | |
b89667eb | 9264 | if (target_has_stack) |
c906108c | 9265 | { |
bf469271 | 9266 | /* The point of the try/catch is that if the stack is clobbered, |
101dcfbe AC |
9267 | walking the stack might encounter a garbage pointer and |
9268 | error() trying to dereference it. */ | |
a70b8144 | 9269 | try |
bf469271 PA |
9270 | { |
9271 | restore_selected_frame (inf_status->selected_frame_id); | |
9272 | } | |
230d2906 | 9273 | catch (const gdb_exception_error &ex) |
bf469271 PA |
9274 | { |
9275 | exception_fprintf (gdb_stderr, ex, | |
9276 | "Unable to restore previously selected frame:\n"); | |
9277 | /* Error in restoring the selected frame. Select the | |
9278 | innermost frame. */ | |
9279 | select_frame (get_current_frame ()); | |
9280 | } | |
c906108c | 9281 | } |
c906108c | 9282 | |
ee841dd8 | 9283 | delete inf_status; |
7a292a7a | 9284 | } |
c906108c SS |
9285 | |
9286 | void | |
16c381f0 | 9287 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 9288 | { |
8358c15c JK |
9289 | if (inf_status->thread_control.step_resume_breakpoint) |
9290 | inf_status->thread_control.step_resume_breakpoint->disposition | |
9291 | = disp_del_at_next_stop; | |
9292 | ||
5b79abe7 TT |
9293 | if (inf_status->thread_control.exception_resume_breakpoint) |
9294 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
9295 | = disp_del_at_next_stop; | |
9296 | ||
1777feb0 | 9297 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 9298 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 9299 | |
ee841dd8 | 9300 | delete inf_status; |
7a292a7a | 9301 | } |
b89667eb | 9302 | \f |
7f89fd65 | 9303 | /* See infrun.h. */ |
0c557179 SDJ |
9304 | |
9305 | void | |
9306 | clear_exit_convenience_vars (void) | |
9307 | { | |
9308 | clear_internalvar (lookup_internalvar ("_exitsignal")); | |
9309 | clear_internalvar (lookup_internalvar ("_exitcode")); | |
9310 | } | |
c5aa993b | 9311 | \f |
488f131b | 9312 | |
b2175913 MS |
9313 | /* User interface for reverse debugging: |
9314 | Set exec-direction / show exec-direction commands | |
9315 | (returns error unless target implements to_set_exec_direction method). */ | |
9316 | ||
170742de | 9317 | enum exec_direction_kind execution_direction = EXEC_FORWARD; |
b2175913 MS |
9318 | static const char exec_forward[] = "forward"; |
9319 | static const char exec_reverse[] = "reverse"; | |
9320 | static const char *exec_direction = exec_forward; | |
40478521 | 9321 | static const char *const exec_direction_names[] = { |
b2175913 MS |
9322 | exec_forward, |
9323 | exec_reverse, | |
9324 | NULL | |
9325 | }; | |
9326 | ||
9327 | static void | |
eb4c3f4a | 9328 | set_exec_direction_func (const char *args, int from_tty, |
b2175913 MS |
9329 | struct cmd_list_element *cmd) |
9330 | { | |
9331 | if (target_can_execute_reverse) | |
9332 | { | |
9333 | if (!strcmp (exec_direction, exec_forward)) | |
9334 | execution_direction = EXEC_FORWARD; | |
9335 | else if (!strcmp (exec_direction, exec_reverse)) | |
9336 | execution_direction = EXEC_REVERSE; | |
9337 | } | |
8bbed405 MS |
9338 | else |
9339 | { | |
9340 | exec_direction = exec_forward; | |
9341 | error (_("Target does not support this operation.")); | |
9342 | } | |
b2175913 MS |
9343 | } |
9344 | ||
9345 | static void | |
9346 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
9347 | struct cmd_list_element *cmd, const char *value) | |
9348 | { | |
9349 | switch (execution_direction) { | |
9350 | case EXEC_FORWARD: | |
9351 | fprintf_filtered (out, _("Forward.\n")); | |
9352 | break; | |
9353 | case EXEC_REVERSE: | |
9354 | fprintf_filtered (out, _("Reverse.\n")); | |
9355 | break; | |
b2175913 | 9356 | default: |
d8b34453 PA |
9357 | internal_error (__FILE__, __LINE__, |
9358 | _("bogus execution_direction value: %d"), | |
9359 | (int) execution_direction); | |
b2175913 MS |
9360 | } |
9361 | } | |
9362 | ||
d4db2f36 PA |
9363 | static void |
9364 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
9365 | struct cmd_list_element *c, const char *value) | |
9366 | { | |
3e43a32a MS |
9367 | fprintf_filtered (file, _("Resuming the execution of threads " |
9368 | "of all processes is %s.\n"), value); | |
d4db2f36 | 9369 | } |
ad52ddc6 | 9370 | |
22d2b532 SDJ |
9371 | /* Implementation of `siginfo' variable. */ |
9372 | ||
9373 | static const struct internalvar_funcs siginfo_funcs = | |
9374 | { | |
9375 | siginfo_make_value, | |
9376 | NULL, | |
9377 | NULL | |
9378 | }; | |
9379 | ||
372316f1 PA |
9380 | /* Callback for infrun's target events source. This is marked when a |
9381 | thread has a pending status to process. */ | |
9382 | ||
9383 | static void | |
9384 | infrun_async_inferior_event_handler (gdb_client_data data) | |
9385 | { | |
372316f1 PA |
9386 | inferior_event_handler (INF_REG_EVENT, NULL); |
9387 | } | |
9388 | ||
6c265988 | 9389 | void _initialize_infrun (); |
c906108c | 9390 | void |
6c265988 | 9391 | _initialize_infrun () |
c906108c | 9392 | { |
de0bea00 | 9393 | struct cmd_list_element *c; |
c906108c | 9394 | |
372316f1 PA |
9395 | /* Register extra event sources in the event loop. */ |
9396 | infrun_async_inferior_event_token | |
9397 | = create_async_event_handler (infrun_async_inferior_event_handler, NULL); | |
9398 | ||
11db9430 | 9399 | add_info ("signals", info_signals_command, _("\ |
1bedd215 AC |
9400 | What debugger does when program gets various signals.\n\ |
9401 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
9402 | add_info_alias ("handle", "signals", 0); |
9403 | ||
de0bea00 | 9404 | c = add_com ("handle", class_run, handle_command, _("\ |
dfbd5e7b | 9405 | Specify how to handle signals.\n\ |
486c7739 | 9406 | Usage: handle SIGNAL [ACTIONS]\n\ |
c906108c | 9407 | Args are signals and actions to apply to those signals.\n\ |
dfbd5e7b | 9408 | If no actions are specified, the current settings for the specified signals\n\ |
486c7739 MF |
9409 | will be displayed instead.\n\ |
9410 | \n\ | |
c906108c SS |
9411 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ |
9412 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
9413 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
9414 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 9415 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
486c7739 | 9416 | \n\ |
1bedd215 | 9417 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
9418 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
9419 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
9420 | Print means print a message if this signal happens.\n\ | |
9421 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
9422 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
dfbd5e7b PA |
9423 | Pass and Stop may be combined.\n\ |
9424 | \n\ | |
9425 | Multiple signals may be specified. Signal numbers and signal names\n\ | |
9426 | may be interspersed with actions, with the actions being performed for\n\ | |
9427 | all signals cumulatively specified.")); | |
de0bea00 | 9428 | set_cmd_completer (c, handle_completer); |
486c7739 | 9429 | |
c906108c | 9430 | if (!dbx_commands) |
1a966eab AC |
9431 | stop_command = add_cmd ("stop", class_obscure, |
9432 | not_just_help_class_command, _("\ | |
9433 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 9434 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 9435 | of the program stops."), &cmdlist); |
c906108c | 9436 | |
ccce17b0 | 9437 | add_setshow_zuinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
85c07804 AC |
9438 | Set inferior debugging."), _("\ |
9439 | Show inferior debugging."), _("\ | |
9440 | When non-zero, inferior specific debugging is enabled."), | |
ccce17b0 YQ |
9441 | NULL, |
9442 | show_debug_infrun, | |
9443 | &setdebuglist, &showdebuglist); | |
527159b7 | 9444 | |
3e43a32a MS |
9445 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
9446 | &debug_displaced, _("\ | |
237fc4c9 PA |
9447 | Set displaced stepping debugging."), _("\ |
9448 | Show displaced stepping debugging."), _("\ | |
9449 | When non-zero, displaced stepping specific debugging is enabled."), | |
9450 | NULL, | |
9451 | show_debug_displaced, | |
9452 | &setdebuglist, &showdebuglist); | |
9453 | ||
ad52ddc6 PA |
9454 | add_setshow_boolean_cmd ("non-stop", no_class, |
9455 | &non_stop_1, _("\ | |
9456 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
9457 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
9458 | When debugging a multi-threaded program and this setting is\n\ | |
9459 | off (the default, also called all-stop mode), when one thread stops\n\ | |
9460 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
9461 | all other threads in the program while you interact with the thread of\n\ | |
9462 | interest. When you continue or step a thread, you can allow the other\n\ | |
9463 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
9464 | thread's state, all threads stop.\n\ | |
9465 | \n\ | |
9466 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
9467 | to run freely. You'll be able to step each thread independently,\n\ | |
9468 | leave it stopped or free to run as needed."), | |
9469 | set_non_stop, | |
9470 | show_non_stop, | |
9471 | &setlist, | |
9472 | &showlist); | |
9473 | ||
adc6a863 | 9474 | for (size_t i = 0; i < GDB_SIGNAL_LAST; i++) |
c906108c SS |
9475 | { |
9476 | signal_stop[i] = 1; | |
9477 | signal_print[i] = 1; | |
9478 | signal_program[i] = 1; | |
ab04a2af | 9479 | signal_catch[i] = 0; |
c906108c SS |
9480 | } |
9481 | ||
4d9d9d04 PA |
9482 | /* Signals caused by debugger's own actions should not be given to |
9483 | the program afterwards. | |
9484 | ||
9485 | Do not deliver GDB_SIGNAL_TRAP by default, except when the user | |
9486 | explicitly specifies that it should be delivered to the target | |
9487 | program. Typically, that would occur when a user is debugging a | |
9488 | target monitor on a simulator: the target monitor sets a | |
9489 | breakpoint; the simulator encounters this breakpoint and halts | |
9490 | the simulation handing control to GDB; GDB, noting that the stop | |
9491 | address doesn't map to any known breakpoint, returns control back | |
9492 | to the simulator; the simulator then delivers the hardware | |
9493 | equivalent of a GDB_SIGNAL_TRAP to the program being | |
9494 | debugged. */ | |
a493e3e2 PA |
9495 | signal_program[GDB_SIGNAL_TRAP] = 0; |
9496 | signal_program[GDB_SIGNAL_INT] = 0; | |
c906108c SS |
9497 | |
9498 | /* Signals that are not errors should not normally enter the debugger. */ | |
a493e3e2 PA |
9499 | signal_stop[GDB_SIGNAL_ALRM] = 0; |
9500 | signal_print[GDB_SIGNAL_ALRM] = 0; | |
9501 | signal_stop[GDB_SIGNAL_VTALRM] = 0; | |
9502 | signal_print[GDB_SIGNAL_VTALRM] = 0; | |
9503 | signal_stop[GDB_SIGNAL_PROF] = 0; | |
9504 | signal_print[GDB_SIGNAL_PROF] = 0; | |
9505 | signal_stop[GDB_SIGNAL_CHLD] = 0; | |
9506 | signal_print[GDB_SIGNAL_CHLD] = 0; | |
9507 | signal_stop[GDB_SIGNAL_IO] = 0; | |
9508 | signal_print[GDB_SIGNAL_IO] = 0; | |
9509 | signal_stop[GDB_SIGNAL_POLL] = 0; | |
9510 | signal_print[GDB_SIGNAL_POLL] = 0; | |
9511 | signal_stop[GDB_SIGNAL_URG] = 0; | |
9512 | signal_print[GDB_SIGNAL_URG] = 0; | |
9513 | signal_stop[GDB_SIGNAL_WINCH] = 0; | |
9514 | signal_print[GDB_SIGNAL_WINCH] = 0; | |
9515 | signal_stop[GDB_SIGNAL_PRIO] = 0; | |
9516 | signal_print[GDB_SIGNAL_PRIO] = 0; | |
c906108c | 9517 | |
cd0fc7c3 SS |
9518 | /* These signals are used internally by user-level thread |
9519 | implementations. (See signal(5) on Solaris.) Like the above | |
9520 | signals, a healthy program receives and handles them as part of | |
9521 | its normal operation. */ | |
a493e3e2 PA |
9522 | signal_stop[GDB_SIGNAL_LWP] = 0; |
9523 | signal_print[GDB_SIGNAL_LWP] = 0; | |
9524 | signal_stop[GDB_SIGNAL_WAITING] = 0; | |
9525 | signal_print[GDB_SIGNAL_WAITING] = 0; | |
9526 | signal_stop[GDB_SIGNAL_CANCEL] = 0; | |
9527 | signal_print[GDB_SIGNAL_CANCEL] = 0; | |
bc7b765a JB |
9528 | signal_stop[GDB_SIGNAL_LIBRT] = 0; |
9529 | signal_print[GDB_SIGNAL_LIBRT] = 0; | |
cd0fc7c3 | 9530 | |
2455069d UW |
9531 | /* Update cached state. */ |
9532 | signal_cache_update (-1); | |
9533 | ||
85c07804 AC |
9534 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
9535 | &stop_on_solib_events, _("\ | |
9536 | Set stopping for shared library events."), _("\ | |
9537 | Show stopping for shared library events."), _("\ | |
c906108c SS |
9538 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
9539 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 | 9540 | to the user would be loading/unloading of a new library."), |
f9e14852 | 9541 | set_stop_on_solib_events, |
920d2a44 | 9542 | show_stop_on_solib_events, |
85c07804 | 9543 | &setlist, &showlist); |
c906108c | 9544 | |
7ab04401 AC |
9545 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
9546 | follow_fork_mode_kind_names, | |
9547 | &follow_fork_mode_string, _("\ | |
9548 | Set debugger response to a program call of fork or vfork."), _("\ | |
9549 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
9550 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
9551 | parent - the original process is debugged after a fork\n\ | |
9552 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 9553 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
9554 | By default, the debugger will follow the parent process."), |
9555 | NULL, | |
920d2a44 | 9556 | show_follow_fork_mode_string, |
7ab04401 AC |
9557 | &setlist, &showlist); |
9558 | ||
6c95b8df PA |
9559 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
9560 | follow_exec_mode_names, | |
9561 | &follow_exec_mode_string, _("\ | |
9562 | Set debugger response to a program call of exec."), _("\ | |
9563 | Show debugger response to a program call of exec."), _("\ | |
9564 | An exec call replaces the program image of a process.\n\ | |
9565 | \n\ | |
9566 | follow-exec-mode can be:\n\ | |
9567 | \n\ | |
cce7e648 | 9568 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
9569 | to this new inferior. The program the process was running before\n\ |
9570 | the exec call can be restarted afterwards by restarting the original\n\ | |
9571 | inferior.\n\ | |
9572 | \n\ | |
9573 | same - the debugger keeps the process bound to the same inferior.\n\ | |
9574 | The new executable image replaces the previous executable loaded in\n\ | |
9575 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
9576 | the executable the process was running after the exec call.\n\ | |
9577 | \n\ | |
9578 | By default, the debugger will use the same inferior."), | |
9579 | NULL, | |
9580 | show_follow_exec_mode_string, | |
9581 | &setlist, &showlist); | |
9582 | ||
7ab04401 AC |
9583 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
9584 | scheduler_enums, &scheduler_mode, _("\ | |
9585 | Set mode for locking scheduler during execution."), _("\ | |
9586 | Show mode for locking scheduler during execution."), _("\ | |
f2665db5 MM |
9587 | off == no locking (threads may preempt at any time)\n\ |
9588 | on == full locking (no thread except the current thread may run)\n\ | |
9589 | This applies to both normal execution and replay mode.\n\ | |
9590 | step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\ | |
9591 | In this mode, other threads may run during other commands.\n\ | |
9592 | This applies to both normal execution and replay mode.\n\ | |
9593 | replay == scheduler locked in replay mode and unlocked during normal execution."), | |
7ab04401 | 9594 | set_schedlock_func, /* traps on target vector */ |
920d2a44 | 9595 | show_scheduler_mode, |
7ab04401 | 9596 | &setlist, &showlist); |
5fbbeb29 | 9597 | |
d4db2f36 PA |
9598 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
9599 | Set mode for resuming threads of all processes."), _("\ | |
9600 | Show mode for resuming threads of all processes."), _("\ | |
9601 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
9602 | threads of all processes. When off (which is the default), execution\n\ | |
9603 | commands only resume the threads of the current process. The set of\n\ | |
9604 | threads that are resumed is further refined by the scheduler-locking\n\ | |
9605 | mode (see help set scheduler-locking)."), | |
9606 | NULL, | |
9607 | show_schedule_multiple, | |
9608 | &setlist, &showlist); | |
9609 | ||
5bf193a2 AC |
9610 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
9611 | Set mode of the step operation."), _("\ | |
9612 | Show mode of the step operation."), _("\ | |
9613 | When set, doing a step over a function without debug line information\n\ | |
9614 | will stop at the first instruction of that function. Otherwise, the\n\ | |
9615 | function is skipped and the step command stops at a different source line."), | |
9616 | NULL, | |
920d2a44 | 9617 | show_step_stop_if_no_debug, |
5bf193a2 | 9618 | &setlist, &showlist); |
ca6724c1 | 9619 | |
72d0e2c5 YQ |
9620 | add_setshow_auto_boolean_cmd ("displaced-stepping", class_run, |
9621 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
9622 | Set debugger's willingness to use displaced stepping."), _("\ |
9623 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
9624 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
9625 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
9626 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
9627 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
9628 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
9629 | use it in all-stop mode (see help set non-stop)."), | |
72d0e2c5 YQ |
9630 | NULL, |
9631 | show_can_use_displaced_stepping, | |
9632 | &setlist, &showlist); | |
237fc4c9 | 9633 | |
b2175913 MS |
9634 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
9635 | &exec_direction, _("Set direction of execution.\n\ | |
9636 | Options are 'forward' or 'reverse'."), | |
9637 | _("Show direction of execution (forward/reverse)."), | |
9638 | _("Tells gdb whether to execute forward or backward."), | |
9639 | set_exec_direction_func, show_exec_direction_func, | |
9640 | &setlist, &showlist); | |
9641 | ||
6c95b8df PA |
9642 | /* Set/show detach-on-fork: user-settable mode. */ |
9643 | ||
9644 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
9645 | Set whether gdb will detach the child of a fork."), _("\ | |
9646 | Show whether gdb will detach the child of a fork."), _("\ | |
9647 | Tells gdb whether to detach the child of a fork."), | |
9648 | NULL, NULL, &setlist, &showlist); | |
9649 | ||
03583c20 UW |
9650 | /* Set/show disable address space randomization mode. */ |
9651 | ||
9652 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
9653 | &disable_randomization, _("\ | |
9654 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
9655 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
9656 | When this mode is on (which is the default), randomization of the virtual\n\ | |
9657 | address space is disabled. Standalone programs run with the randomization\n\ | |
9658 | enabled by default on some platforms."), | |
9659 | &set_disable_randomization, | |
9660 | &show_disable_randomization, | |
9661 | &setlist, &showlist); | |
9662 | ||
ca6724c1 | 9663 | /* ptid initializations */ |
ca6724c1 KB |
9664 | inferior_ptid = null_ptid; |
9665 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd | 9666 | |
76727919 TT |
9667 | gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed); |
9668 | gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested); | |
9669 | gdb::observers::thread_exit.attach (infrun_thread_thread_exit); | |
9670 | gdb::observers::inferior_exit.attach (infrun_inferior_exit); | |
4aa995e1 PA |
9671 | |
9672 | /* Explicitly create without lookup, since that tries to create a | |
9673 | value with a void typed value, and when we get here, gdbarch | |
9674 | isn't initialized yet. At this point, we're quite sure there | |
9675 | isn't another convenience variable of the same name. */ | |
22d2b532 | 9676 | create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL); |
d914c394 SS |
9677 | |
9678 | add_setshow_boolean_cmd ("observer", no_class, | |
9679 | &observer_mode_1, _("\ | |
9680 | Set whether gdb controls the inferior in observer mode."), _("\ | |
9681 | Show whether gdb controls the inferior in observer mode."), _("\ | |
9682 | In observer mode, GDB can get data from the inferior, but not\n\ | |
9683 | affect its execution. Registers and memory may not be changed,\n\ | |
9684 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
9685 | or signalled."), | |
9686 | set_observer_mode, | |
9687 | show_observer_mode, | |
9688 | &setlist, | |
9689 | &showlist); | |
c906108c | 9690 | } |