Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
6aba47ca | 4 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
9b254dd1 | 5 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
7b6bb8da | 6 | 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
c906108c | 7 | |
c5aa993b | 8 | This file is part of GDB. |
c906108c | 9 | |
c5aa993b JM |
10 | This program is free software; you can redistribute it and/or modify |
11 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 12 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 13 | (at your option) any later version. |
c906108c | 14 | |
c5aa993b JM |
15 | This program is distributed in the hope that it will be useful, |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
c906108c | 19 | |
c5aa993b | 20 | You should have received a copy of the GNU General Public License |
a9762ec7 | 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "gdb_string.h" | |
25 | #include <ctype.h> | |
26 | #include "symtab.h" | |
27 | #include "frame.h" | |
28 | #include "inferior.h" | |
60250e8b | 29 | #include "exceptions.h" |
c906108c | 30 | #include "breakpoint.h" |
03f2053f | 31 | #include "gdb_wait.h" |
c906108c SS |
32 | #include "gdbcore.h" |
33 | #include "gdbcmd.h" | |
210661e7 | 34 | #include "cli/cli-script.h" |
c906108c SS |
35 | #include "target.h" |
36 | #include "gdbthread.h" | |
37 | #include "annotate.h" | |
1adeb98a | 38 | #include "symfile.h" |
7a292a7a | 39 | #include "top.h" |
c906108c | 40 | #include <signal.h> |
2acceee2 | 41 | #include "inf-loop.h" |
4e052eda | 42 | #include "regcache.h" |
fd0407d6 | 43 | #include "value.h" |
06600e06 | 44 | #include "observer.h" |
f636b87d | 45 | #include "language.h" |
a77053c2 | 46 | #include "solib.h" |
f17517ea | 47 | #include "main.h" |
186c406b TT |
48 | #include "dictionary.h" |
49 | #include "block.h" | |
9f976b41 | 50 | #include "gdb_assert.h" |
034dad6f | 51 | #include "mi/mi-common.h" |
4f8d22e3 | 52 | #include "event-top.h" |
96429cc8 | 53 | #include "record.h" |
edb3359d | 54 | #include "inline-frame.h" |
4efc6507 | 55 | #include "jit.h" |
06cd862c | 56 | #include "tracepoint.h" |
be34f849 | 57 | #include "continuations.h" |
b4a14fd0 | 58 | #include "interps.h" |
1bfeeb0f | 59 | #include "skip.h" |
c906108c SS |
60 | |
61 | /* Prototypes for local functions */ | |
62 | ||
96baa820 | 63 | static void signals_info (char *, int); |
c906108c | 64 | |
96baa820 | 65 | static void handle_command (char *, int); |
c906108c | 66 | |
96baa820 | 67 | static void sig_print_info (enum target_signal); |
c906108c | 68 | |
96baa820 | 69 | static void sig_print_header (void); |
c906108c | 70 | |
74b7792f | 71 | static void resume_cleanups (void *); |
c906108c | 72 | |
96baa820 | 73 | static int hook_stop_stub (void *); |
c906108c | 74 | |
96baa820 JM |
75 | static int restore_selected_frame (void *); |
76 | ||
4ef3f3be | 77 | static int follow_fork (void); |
96baa820 JM |
78 | |
79 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 80 | struct cmd_list_element *c); |
96baa820 | 81 | |
a289b8f6 JK |
82 | static int currently_stepping (struct thread_info *tp); |
83 | ||
b3444185 PA |
84 | static int currently_stepping_or_nexting_callback (struct thread_info *tp, |
85 | void *data); | |
a7212384 | 86 | |
96baa820 JM |
87 | static void xdb_handle_command (char *args, int from_tty); |
88 | ||
6a6b96b9 | 89 | static int prepare_to_proceed (int); |
ea67f13b | 90 | |
33d62d64 JK |
91 | static void print_exited_reason (int exitstatus); |
92 | ||
93 | static void print_signal_exited_reason (enum target_signal siggnal); | |
94 | ||
95 | static void print_no_history_reason (void); | |
96 | ||
97 | static void print_signal_received_reason (enum target_signal siggnal); | |
98 | ||
99 | static void print_end_stepping_range_reason (void); | |
100 | ||
96baa820 | 101 | void _initialize_infrun (void); |
43ff13b4 | 102 | |
e58b0e63 PA |
103 | void nullify_last_target_wait_ptid (void); |
104 | ||
2c03e5be | 105 | static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *); |
2484c66b UW |
106 | |
107 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); | |
108 | ||
2484c66b UW |
109 | static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR); |
110 | ||
5fbbeb29 CF |
111 | /* When set, stop the 'step' command if we enter a function which has |
112 | no line number information. The normal behavior is that we step | |
113 | over such function. */ | |
114 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
115 | static void |
116 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
117 | struct cmd_list_element *c, const char *value) | |
118 | { | |
119 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
120 | } | |
5fbbeb29 | 121 | |
1777feb0 | 122 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 123 | |
43ff13b4 JM |
124 | int sync_execution = 0; |
125 | ||
c906108c SS |
126 | /* wait_for_inferior and normal_stop use this to notify the user |
127 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
128 | running in. */ |
129 | ||
39f77062 | 130 | static ptid_t previous_inferior_ptid; |
7a292a7a | 131 | |
6c95b8df PA |
132 | /* Default behavior is to detach newly forked processes (legacy). */ |
133 | int detach_fork = 1; | |
134 | ||
237fc4c9 PA |
135 | int debug_displaced = 0; |
136 | static void | |
137 | show_debug_displaced (struct ui_file *file, int from_tty, | |
138 | struct cmd_list_element *c, const char *value) | |
139 | { | |
140 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
141 | } | |
142 | ||
628fe4e4 | 143 | int debug_infrun = 0; |
920d2a44 AC |
144 | static void |
145 | show_debug_infrun (struct ui_file *file, int from_tty, | |
146 | struct cmd_list_element *c, const char *value) | |
147 | { | |
148 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
149 | } | |
527159b7 | 150 | |
03583c20 UW |
151 | |
152 | /* Support for disabling address space randomization. */ | |
153 | ||
154 | int disable_randomization = 1; | |
155 | ||
156 | static void | |
157 | show_disable_randomization (struct ui_file *file, int from_tty, | |
158 | struct cmd_list_element *c, const char *value) | |
159 | { | |
160 | if (target_supports_disable_randomization ()) | |
161 | fprintf_filtered (file, | |
162 | _("Disabling randomization of debuggee's " | |
163 | "virtual address space is %s.\n"), | |
164 | value); | |
165 | else | |
166 | fputs_filtered (_("Disabling randomization of debuggee's " | |
167 | "virtual address space is unsupported on\n" | |
168 | "this platform.\n"), file); | |
169 | } | |
170 | ||
171 | static void | |
172 | set_disable_randomization (char *args, int from_tty, | |
173 | struct cmd_list_element *c) | |
174 | { | |
175 | if (!target_supports_disable_randomization ()) | |
176 | error (_("Disabling randomization of debuggee's " | |
177 | "virtual address space is unsupported on\n" | |
178 | "this platform.")); | |
179 | } | |
180 | ||
181 | ||
d4f3574e SS |
182 | /* If the program uses ELF-style shared libraries, then calls to |
183 | functions in shared libraries go through stubs, which live in a | |
184 | table called the PLT (Procedure Linkage Table). The first time the | |
185 | function is called, the stub sends control to the dynamic linker, | |
186 | which looks up the function's real address, patches the stub so | |
187 | that future calls will go directly to the function, and then passes | |
188 | control to the function. | |
189 | ||
190 | If we are stepping at the source level, we don't want to see any of | |
191 | this --- we just want to skip over the stub and the dynamic linker. | |
192 | The simple approach is to single-step until control leaves the | |
193 | dynamic linker. | |
194 | ||
ca557f44 AC |
195 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
196 | dynamic linker calls functions in the shared C library, so you | |
197 | can't tell from the PC alone whether the dynamic linker is still | |
198 | running. In this case, we use a step-resume breakpoint to get us | |
199 | past the dynamic linker, as if we were using "next" to step over a | |
200 | function call. | |
d4f3574e | 201 | |
cfd8ab24 | 202 | in_solib_dynsym_resolve_code() says whether we're in the dynamic |
d4f3574e SS |
203 | linker code or not. Normally, this means we single-step. However, |
204 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
205 | address where we can place a step-resume breakpoint to get past the | |
206 | linker's symbol resolution function. | |
207 | ||
cfd8ab24 | 208 | in_solib_dynsym_resolve_code() can generally be implemented in a |
d4f3574e SS |
209 | pretty portable way, by comparing the PC against the address ranges |
210 | of the dynamic linker's sections. | |
211 | ||
212 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
213 | it depends on internal details of the dynamic linker. It's usually | |
214 | not too hard to figure out where to put a breakpoint, but it | |
215 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
216 | sanity checking. If it can't figure things out, returning zero and | |
217 | getting the (possibly confusing) stepping behavior is better than | |
218 | signalling an error, which will obscure the change in the | |
219 | inferior's state. */ | |
c906108c | 220 | |
c906108c SS |
221 | /* This function returns TRUE if pc is the address of an instruction |
222 | that lies within the dynamic linker (such as the event hook, or the | |
223 | dld itself). | |
224 | ||
225 | This function must be used only when a dynamic linker event has | |
226 | been caught, and the inferior is being stepped out of the hook, or | |
227 | undefined results are guaranteed. */ | |
228 | ||
229 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
230 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
231 | #endif | |
232 | ||
d914c394 SS |
233 | /* "Observer mode" is somewhat like a more extreme version of |
234 | non-stop, in which all GDB operations that might affect the | |
235 | target's execution have been disabled. */ | |
236 | ||
237 | static int non_stop_1 = 0; | |
238 | ||
239 | int observer_mode = 0; | |
240 | static int observer_mode_1 = 0; | |
241 | ||
242 | static void | |
243 | set_observer_mode (char *args, int from_tty, | |
244 | struct cmd_list_element *c) | |
245 | { | |
246 | extern int pagination_enabled; | |
247 | ||
248 | if (target_has_execution) | |
249 | { | |
250 | observer_mode_1 = observer_mode; | |
251 | error (_("Cannot change this setting while the inferior is running.")); | |
252 | } | |
253 | ||
254 | observer_mode = observer_mode_1; | |
255 | ||
256 | may_write_registers = !observer_mode; | |
257 | may_write_memory = !observer_mode; | |
258 | may_insert_breakpoints = !observer_mode; | |
259 | may_insert_tracepoints = !observer_mode; | |
260 | /* We can insert fast tracepoints in or out of observer mode, | |
261 | but enable them if we're going into this mode. */ | |
262 | if (observer_mode) | |
263 | may_insert_fast_tracepoints = 1; | |
264 | may_stop = !observer_mode; | |
265 | update_target_permissions (); | |
266 | ||
267 | /* Going *into* observer mode we must force non-stop, then | |
268 | going out we leave it that way. */ | |
269 | if (observer_mode) | |
270 | { | |
271 | target_async_permitted = 1; | |
272 | pagination_enabled = 0; | |
273 | non_stop = non_stop_1 = 1; | |
274 | } | |
275 | ||
276 | if (from_tty) | |
277 | printf_filtered (_("Observer mode is now %s.\n"), | |
278 | (observer_mode ? "on" : "off")); | |
279 | } | |
280 | ||
281 | static void | |
282 | show_observer_mode (struct ui_file *file, int from_tty, | |
283 | struct cmd_list_element *c, const char *value) | |
284 | { | |
285 | fprintf_filtered (file, _("Observer mode is %s.\n"), value); | |
286 | } | |
287 | ||
288 | /* This updates the value of observer mode based on changes in | |
289 | permissions. Note that we are deliberately ignoring the values of | |
290 | may-write-registers and may-write-memory, since the user may have | |
291 | reason to enable these during a session, for instance to turn on a | |
292 | debugging-related global. */ | |
293 | ||
294 | void | |
295 | update_observer_mode (void) | |
296 | { | |
297 | int newval; | |
298 | ||
299 | newval = (!may_insert_breakpoints | |
300 | && !may_insert_tracepoints | |
301 | && may_insert_fast_tracepoints | |
302 | && !may_stop | |
303 | && non_stop); | |
304 | ||
305 | /* Let the user know if things change. */ | |
306 | if (newval != observer_mode) | |
307 | printf_filtered (_("Observer mode is now %s.\n"), | |
308 | (newval ? "on" : "off")); | |
309 | ||
310 | observer_mode = observer_mode_1 = newval; | |
311 | } | |
c2c6d25f | 312 | |
c906108c SS |
313 | /* Tables of how to react to signals; the user sets them. */ |
314 | ||
315 | static unsigned char *signal_stop; | |
316 | static unsigned char *signal_print; | |
317 | static unsigned char *signal_program; | |
318 | ||
2455069d UW |
319 | /* Table of signals that the target may silently handle. |
320 | This is automatically determined from the flags above, | |
321 | and simply cached here. */ | |
322 | static unsigned char *signal_pass; | |
323 | ||
c906108c SS |
324 | #define SET_SIGS(nsigs,sigs,flags) \ |
325 | do { \ | |
326 | int signum = (nsigs); \ | |
327 | while (signum-- > 0) \ | |
328 | if ((sigs)[signum]) \ | |
329 | (flags)[signum] = 1; \ | |
330 | } while (0) | |
331 | ||
332 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
333 | do { \ | |
334 | int signum = (nsigs); \ | |
335 | while (signum-- > 0) \ | |
336 | if ((sigs)[signum]) \ | |
337 | (flags)[signum] = 0; \ | |
338 | } while (0) | |
339 | ||
1777feb0 | 340 | /* Value to pass to target_resume() to cause all threads to resume. */ |
39f77062 | 341 | |
edb3359d | 342 | #define RESUME_ALL minus_one_ptid |
c906108c SS |
343 | |
344 | /* Command list pointer for the "stop" placeholder. */ | |
345 | ||
346 | static struct cmd_list_element *stop_command; | |
347 | ||
c906108c SS |
348 | /* Function inferior was in as of last step command. */ |
349 | ||
350 | static struct symbol *step_start_function; | |
351 | ||
c906108c SS |
352 | /* Nonzero if we want to give control to the user when we're notified |
353 | of shared library events by the dynamic linker. */ | |
628fe4e4 | 354 | int stop_on_solib_events; |
920d2a44 AC |
355 | static void |
356 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
357 | struct cmd_list_element *c, const char *value) | |
358 | { | |
359 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
360 | value); | |
361 | } | |
c906108c | 362 | |
c906108c SS |
363 | /* Nonzero means expecting a trace trap |
364 | and should stop the inferior and return silently when it happens. */ | |
365 | ||
366 | int stop_after_trap; | |
367 | ||
642fd101 DE |
368 | /* Save register contents here when executing a "finish" command or are |
369 | about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set. | |
c906108c SS |
370 | Thus this contains the return value from the called function (assuming |
371 | values are returned in a register). */ | |
372 | ||
72cec141 | 373 | struct regcache *stop_registers; |
c906108c | 374 | |
c906108c SS |
375 | /* Nonzero after stop if current stack frame should be printed. */ |
376 | ||
377 | static int stop_print_frame; | |
378 | ||
e02bc4cc | 379 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
380 | returned by target_wait()/deprecated_target_wait_hook(). This |
381 | information is returned by get_last_target_status(). */ | |
39f77062 | 382 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
383 | static struct target_waitstatus target_last_waitstatus; |
384 | ||
0d1e5fa7 PA |
385 | static void context_switch (ptid_t ptid); |
386 | ||
4e1c45ea | 387 | void init_thread_stepping_state (struct thread_info *tss); |
0d1e5fa7 PA |
388 | |
389 | void init_infwait_state (void); | |
a474d7c2 | 390 | |
53904c9e AC |
391 | static const char follow_fork_mode_child[] = "child"; |
392 | static const char follow_fork_mode_parent[] = "parent"; | |
393 | ||
488f131b | 394 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e AC |
395 | follow_fork_mode_child, |
396 | follow_fork_mode_parent, | |
397 | NULL | |
ef346e04 | 398 | }; |
c906108c | 399 | |
53904c9e | 400 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
401 | static void |
402 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
403 | struct cmd_list_element *c, const char *value) | |
404 | { | |
3e43a32a MS |
405 | fprintf_filtered (file, |
406 | _("Debugger response to a program " | |
407 | "call of fork or vfork is \"%s\".\n"), | |
920d2a44 AC |
408 | value); |
409 | } | |
c906108c SS |
410 | \f |
411 | ||
e58b0e63 PA |
412 | /* Tell the target to follow the fork we're stopped at. Returns true |
413 | if the inferior should be resumed; false, if the target for some | |
414 | reason decided it's best not to resume. */ | |
415 | ||
6604731b | 416 | static int |
4ef3f3be | 417 | follow_fork (void) |
c906108c | 418 | { |
ea1dd7bc | 419 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
e58b0e63 PA |
420 | int should_resume = 1; |
421 | struct thread_info *tp; | |
422 | ||
423 | /* Copy user stepping state to the new inferior thread. FIXME: the | |
424 | followed fork child thread should have a copy of most of the | |
4e3990f4 DE |
425 | parent thread structure's run control related fields, not just these. |
426 | Initialized to avoid "may be used uninitialized" warnings from gcc. */ | |
427 | struct breakpoint *step_resume_breakpoint = NULL; | |
186c406b | 428 | struct breakpoint *exception_resume_breakpoint = NULL; |
4e3990f4 DE |
429 | CORE_ADDR step_range_start = 0; |
430 | CORE_ADDR step_range_end = 0; | |
431 | struct frame_id step_frame_id = { 0 }; | |
e58b0e63 PA |
432 | |
433 | if (!non_stop) | |
434 | { | |
435 | ptid_t wait_ptid; | |
436 | struct target_waitstatus wait_status; | |
437 | ||
438 | /* Get the last target status returned by target_wait(). */ | |
439 | get_last_target_status (&wait_ptid, &wait_status); | |
440 | ||
441 | /* If not stopped at a fork event, then there's nothing else to | |
442 | do. */ | |
443 | if (wait_status.kind != TARGET_WAITKIND_FORKED | |
444 | && wait_status.kind != TARGET_WAITKIND_VFORKED) | |
445 | return 1; | |
446 | ||
447 | /* Check if we switched over from WAIT_PTID, since the event was | |
448 | reported. */ | |
449 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
450 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
451 | { | |
452 | /* We did. Switch back to WAIT_PTID thread, to tell the | |
453 | target to follow it (in either direction). We'll | |
454 | afterwards refuse to resume, and inform the user what | |
455 | happened. */ | |
456 | switch_to_thread (wait_ptid); | |
457 | should_resume = 0; | |
458 | } | |
459 | } | |
460 | ||
461 | tp = inferior_thread (); | |
462 | ||
463 | /* If there were any forks/vforks that were caught and are now to be | |
464 | followed, then do so now. */ | |
465 | switch (tp->pending_follow.kind) | |
466 | { | |
467 | case TARGET_WAITKIND_FORKED: | |
468 | case TARGET_WAITKIND_VFORKED: | |
469 | { | |
470 | ptid_t parent, child; | |
471 | ||
472 | /* If the user did a next/step, etc, over a fork call, | |
473 | preserve the stepping state in the fork child. */ | |
474 | if (follow_child && should_resume) | |
475 | { | |
8358c15c JK |
476 | step_resume_breakpoint = clone_momentary_breakpoint |
477 | (tp->control.step_resume_breakpoint); | |
16c381f0 JK |
478 | step_range_start = tp->control.step_range_start; |
479 | step_range_end = tp->control.step_range_end; | |
480 | step_frame_id = tp->control.step_frame_id; | |
186c406b TT |
481 | exception_resume_breakpoint |
482 | = clone_momentary_breakpoint (tp->control.exception_resume_breakpoint); | |
e58b0e63 PA |
483 | |
484 | /* For now, delete the parent's sr breakpoint, otherwise, | |
485 | parent/child sr breakpoints are considered duplicates, | |
486 | and the child version will not be installed. Remove | |
487 | this when the breakpoints module becomes aware of | |
488 | inferiors and address spaces. */ | |
489 | delete_step_resume_breakpoint (tp); | |
16c381f0 JK |
490 | tp->control.step_range_start = 0; |
491 | tp->control.step_range_end = 0; | |
492 | tp->control.step_frame_id = null_frame_id; | |
186c406b | 493 | delete_exception_resume_breakpoint (tp); |
e58b0e63 PA |
494 | } |
495 | ||
496 | parent = inferior_ptid; | |
497 | child = tp->pending_follow.value.related_pid; | |
498 | ||
499 | /* Tell the target to do whatever is necessary to follow | |
500 | either parent or child. */ | |
501 | if (target_follow_fork (follow_child)) | |
502 | { | |
503 | /* Target refused to follow, or there's some other reason | |
504 | we shouldn't resume. */ | |
505 | should_resume = 0; | |
506 | } | |
507 | else | |
508 | { | |
509 | /* This pending follow fork event is now handled, one way | |
510 | or another. The previous selected thread may be gone | |
511 | from the lists by now, but if it is still around, need | |
512 | to clear the pending follow request. */ | |
e09875d4 | 513 | tp = find_thread_ptid (parent); |
e58b0e63 PA |
514 | if (tp) |
515 | tp->pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
516 | ||
517 | /* This makes sure we don't try to apply the "Switched | |
518 | over from WAIT_PID" logic above. */ | |
519 | nullify_last_target_wait_ptid (); | |
520 | ||
1777feb0 | 521 | /* If we followed the child, switch to it... */ |
e58b0e63 PA |
522 | if (follow_child) |
523 | { | |
524 | switch_to_thread (child); | |
525 | ||
526 | /* ... and preserve the stepping state, in case the | |
527 | user was stepping over the fork call. */ | |
528 | if (should_resume) | |
529 | { | |
530 | tp = inferior_thread (); | |
8358c15c JK |
531 | tp->control.step_resume_breakpoint |
532 | = step_resume_breakpoint; | |
16c381f0 JK |
533 | tp->control.step_range_start = step_range_start; |
534 | tp->control.step_range_end = step_range_end; | |
535 | tp->control.step_frame_id = step_frame_id; | |
186c406b TT |
536 | tp->control.exception_resume_breakpoint |
537 | = exception_resume_breakpoint; | |
e58b0e63 PA |
538 | } |
539 | else | |
540 | { | |
541 | /* If we get here, it was because we're trying to | |
542 | resume from a fork catchpoint, but, the user | |
543 | has switched threads away from the thread that | |
544 | forked. In that case, the resume command | |
545 | issued is most likely not applicable to the | |
546 | child, so just warn, and refuse to resume. */ | |
3e43a32a MS |
547 | warning (_("Not resuming: switched threads " |
548 | "before following fork child.\n")); | |
e58b0e63 PA |
549 | } |
550 | ||
551 | /* Reset breakpoints in the child as appropriate. */ | |
552 | follow_inferior_reset_breakpoints (); | |
553 | } | |
554 | else | |
555 | switch_to_thread (parent); | |
556 | } | |
557 | } | |
558 | break; | |
559 | case TARGET_WAITKIND_SPURIOUS: | |
560 | /* Nothing to follow. */ | |
561 | break; | |
562 | default: | |
563 | internal_error (__FILE__, __LINE__, | |
564 | "Unexpected pending_follow.kind %d\n", | |
565 | tp->pending_follow.kind); | |
566 | break; | |
567 | } | |
c906108c | 568 | |
e58b0e63 | 569 | return should_resume; |
c906108c SS |
570 | } |
571 | ||
6604731b DJ |
572 | void |
573 | follow_inferior_reset_breakpoints (void) | |
c906108c | 574 | { |
4e1c45ea PA |
575 | struct thread_info *tp = inferior_thread (); |
576 | ||
6604731b DJ |
577 | /* Was there a step_resume breakpoint? (There was if the user |
578 | did a "next" at the fork() call.) If so, explicitly reset its | |
579 | thread number. | |
580 | ||
581 | step_resumes are a form of bp that are made to be per-thread. | |
582 | Since we created the step_resume bp when the parent process | |
583 | was being debugged, and now are switching to the child process, | |
584 | from the breakpoint package's viewpoint, that's a switch of | |
585 | "threads". We must update the bp's notion of which thread | |
586 | it is for, or it'll be ignored when it triggers. */ | |
587 | ||
8358c15c JK |
588 | if (tp->control.step_resume_breakpoint) |
589 | breakpoint_re_set_thread (tp->control.step_resume_breakpoint); | |
6604731b | 590 | |
186c406b TT |
591 | if (tp->control.exception_resume_breakpoint) |
592 | breakpoint_re_set_thread (tp->control.exception_resume_breakpoint); | |
593 | ||
6604731b DJ |
594 | /* Reinsert all breakpoints in the child. The user may have set |
595 | breakpoints after catching the fork, in which case those | |
596 | were never set in the child, but only in the parent. This makes | |
597 | sure the inserted breakpoints match the breakpoint list. */ | |
598 | ||
599 | breakpoint_re_set (); | |
600 | insert_breakpoints (); | |
c906108c | 601 | } |
c906108c | 602 | |
6c95b8df PA |
603 | /* The child has exited or execed: resume threads of the parent the |
604 | user wanted to be executing. */ | |
605 | ||
606 | static int | |
607 | proceed_after_vfork_done (struct thread_info *thread, | |
608 | void *arg) | |
609 | { | |
610 | int pid = * (int *) arg; | |
611 | ||
612 | if (ptid_get_pid (thread->ptid) == pid | |
613 | && is_running (thread->ptid) | |
614 | && !is_executing (thread->ptid) | |
615 | && !thread->stop_requested | |
16c381f0 | 616 | && thread->suspend.stop_signal == TARGET_SIGNAL_0) |
6c95b8df PA |
617 | { |
618 | if (debug_infrun) | |
619 | fprintf_unfiltered (gdb_stdlog, | |
620 | "infrun: resuming vfork parent thread %s\n", | |
621 | target_pid_to_str (thread->ptid)); | |
622 | ||
623 | switch_to_thread (thread->ptid); | |
624 | clear_proceed_status (); | |
625 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_DEFAULT, 0); | |
626 | } | |
627 | ||
628 | return 0; | |
629 | } | |
630 | ||
631 | /* Called whenever we notice an exec or exit event, to handle | |
632 | detaching or resuming a vfork parent. */ | |
633 | ||
634 | static void | |
635 | handle_vfork_child_exec_or_exit (int exec) | |
636 | { | |
637 | struct inferior *inf = current_inferior (); | |
638 | ||
639 | if (inf->vfork_parent) | |
640 | { | |
641 | int resume_parent = -1; | |
642 | ||
643 | /* This exec or exit marks the end of the shared memory region | |
644 | between the parent and the child. If the user wanted to | |
645 | detach from the parent, now is the time. */ | |
646 | ||
647 | if (inf->vfork_parent->pending_detach) | |
648 | { | |
649 | struct thread_info *tp; | |
650 | struct cleanup *old_chain; | |
651 | struct program_space *pspace; | |
652 | struct address_space *aspace; | |
653 | ||
1777feb0 | 654 | /* follow-fork child, detach-on-fork on. */ |
6c95b8df PA |
655 | |
656 | old_chain = make_cleanup_restore_current_thread (); | |
657 | ||
658 | /* We're letting loose of the parent. */ | |
659 | tp = any_live_thread_of_process (inf->vfork_parent->pid); | |
660 | switch_to_thread (tp->ptid); | |
661 | ||
662 | /* We're about to detach from the parent, which implicitly | |
663 | removes breakpoints from its address space. There's a | |
664 | catch here: we want to reuse the spaces for the child, | |
665 | but, parent/child are still sharing the pspace at this | |
666 | point, although the exec in reality makes the kernel give | |
667 | the child a fresh set of new pages. The problem here is | |
668 | that the breakpoints module being unaware of this, would | |
669 | likely chose the child process to write to the parent | |
670 | address space. Swapping the child temporarily away from | |
671 | the spaces has the desired effect. Yes, this is "sort | |
672 | of" a hack. */ | |
673 | ||
674 | pspace = inf->pspace; | |
675 | aspace = inf->aspace; | |
676 | inf->aspace = NULL; | |
677 | inf->pspace = NULL; | |
678 | ||
679 | if (debug_infrun || info_verbose) | |
680 | { | |
681 | target_terminal_ours (); | |
682 | ||
683 | if (exec) | |
684 | fprintf_filtered (gdb_stdlog, | |
3e43a32a MS |
685 | "Detaching vfork parent process " |
686 | "%d after child exec.\n", | |
6c95b8df PA |
687 | inf->vfork_parent->pid); |
688 | else | |
689 | fprintf_filtered (gdb_stdlog, | |
3e43a32a MS |
690 | "Detaching vfork parent process " |
691 | "%d after child exit.\n", | |
6c95b8df PA |
692 | inf->vfork_parent->pid); |
693 | } | |
694 | ||
695 | target_detach (NULL, 0); | |
696 | ||
697 | /* Put it back. */ | |
698 | inf->pspace = pspace; | |
699 | inf->aspace = aspace; | |
700 | ||
701 | do_cleanups (old_chain); | |
702 | } | |
703 | else if (exec) | |
704 | { | |
705 | /* We're staying attached to the parent, so, really give the | |
706 | child a new address space. */ | |
707 | inf->pspace = add_program_space (maybe_new_address_space ()); | |
708 | inf->aspace = inf->pspace->aspace; | |
709 | inf->removable = 1; | |
710 | set_current_program_space (inf->pspace); | |
711 | ||
712 | resume_parent = inf->vfork_parent->pid; | |
713 | ||
714 | /* Break the bonds. */ | |
715 | inf->vfork_parent->vfork_child = NULL; | |
716 | } | |
717 | else | |
718 | { | |
719 | struct cleanup *old_chain; | |
720 | struct program_space *pspace; | |
721 | ||
722 | /* If this is a vfork child exiting, then the pspace and | |
723 | aspaces were shared with the parent. Since we're | |
724 | reporting the process exit, we'll be mourning all that is | |
725 | found in the address space, and switching to null_ptid, | |
726 | preparing to start a new inferior. But, since we don't | |
727 | want to clobber the parent's address/program spaces, we | |
728 | go ahead and create a new one for this exiting | |
729 | inferior. */ | |
730 | ||
731 | /* Switch to null_ptid, so that clone_program_space doesn't want | |
732 | to read the selected frame of a dead process. */ | |
733 | old_chain = save_inferior_ptid (); | |
734 | inferior_ptid = null_ptid; | |
735 | ||
736 | /* This inferior is dead, so avoid giving the breakpoints | |
737 | module the option to write through to it (cloning a | |
738 | program space resets breakpoints). */ | |
739 | inf->aspace = NULL; | |
740 | inf->pspace = NULL; | |
741 | pspace = add_program_space (maybe_new_address_space ()); | |
742 | set_current_program_space (pspace); | |
743 | inf->removable = 1; | |
744 | clone_program_space (pspace, inf->vfork_parent->pspace); | |
745 | inf->pspace = pspace; | |
746 | inf->aspace = pspace->aspace; | |
747 | ||
748 | /* Put back inferior_ptid. We'll continue mourning this | |
1777feb0 | 749 | inferior. */ |
6c95b8df PA |
750 | do_cleanups (old_chain); |
751 | ||
752 | resume_parent = inf->vfork_parent->pid; | |
753 | /* Break the bonds. */ | |
754 | inf->vfork_parent->vfork_child = NULL; | |
755 | } | |
756 | ||
757 | inf->vfork_parent = NULL; | |
758 | ||
759 | gdb_assert (current_program_space == inf->pspace); | |
760 | ||
761 | if (non_stop && resume_parent != -1) | |
762 | { | |
763 | /* If the user wanted the parent to be running, let it go | |
764 | free now. */ | |
765 | struct cleanup *old_chain = make_cleanup_restore_current_thread (); | |
766 | ||
767 | if (debug_infrun) | |
3e43a32a MS |
768 | fprintf_unfiltered (gdb_stdlog, |
769 | "infrun: resuming vfork parent process %d\n", | |
6c95b8df PA |
770 | resume_parent); |
771 | ||
772 | iterate_over_threads (proceed_after_vfork_done, &resume_parent); | |
773 | ||
774 | do_cleanups (old_chain); | |
775 | } | |
776 | } | |
777 | } | |
778 | ||
779 | /* Enum strings for "set|show displaced-stepping". */ | |
780 | ||
781 | static const char follow_exec_mode_new[] = "new"; | |
782 | static const char follow_exec_mode_same[] = "same"; | |
783 | static const char *follow_exec_mode_names[] = | |
784 | { | |
785 | follow_exec_mode_new, | |
786 | follow_exec_mode_same, | |
787 | NULL, | |
788 | }; | |
789 | ||
790 | static const char *follow_exec_mode_string = follow_exec_mode_same; | |
791 | static void | |
792 | show_follow_exec_mode_string (struct ui_file *file, int from_tty, | |
793 | struct cmd_list_element *c, const char *value) | |
794 | { | |
795 | fprintf_filtered (file, _("Follow exec mode is \"%s\".\n"), value); | |
796 | } | |
797 | ||
1777feb0 | 798 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
1adeb98a | 799 | |
c906108c | 800 | static void |
3a3e9ee3 | 801 | follow_exec (ptid_t pid, char *execd_pathname) |
c906108c | 802 | { |
4e1c45ea | 803 | struct thread_info *th = inferior_thread (); |
6c95b8df | 804 | struct inferior *inf = current_inferior (); |
7a292a7a | 805 | |
c906108c SS |
806 | /* This is an exec event that we actually wish to pay attention to. |
807 | Refresh our symbol table to the newly exec'd program, remove any | |
808 | momentary bp's, etc. | |
809 | ||
810 | If there are breakpoints, they aren't really inserted now, | |
811 | since the exec() transformed our inferior into a fresh set | |
812 | of instructions. | |
813 | ||
814 | We want to preserve symbolic breakpoints on the list, since | |
815 | we have hopes that they can be reset after the new a.out's | |
816 | symbol table is read. | |
817 | ||
818 | However, any "raw" breakpoints must be removed from the list | |
819 | (e.g., the solib bp's), since their address is probably invalid | |
820 | now. | |
821 | ||
822 | And, we DON'T want to call delete_breakpoints() here, since | |
823 | that may write the bp's "shadow contents" (the instruction | |
824 | value that was overwritten witha TRAP instruction). Since | |
1777feb0 | 825 | we now have a new a.out, those shadow contents aren't valid. */ |
6c95b8df PA |
826 | |
827 | mark_breakpoints_out (); | |
828 | ||
c906108c SS |
829 | update_breakpoints_after_exec (); |
830 | ||
831 | /* If there was one, it's gone now. We cannot truly step-to-next | |
1777feb0 | 832 | statement through an exec(). */ |
8358c15c | 833 | th->control.step_resume_breakpoint = NULL; |
186c406b | 834 | th->control.exception_resume_breakpoint = NULL; |
16c381f0 JK |
835 | th->control.step_range_start = 0; |
836 | th->control.step_range_end = 0; | |
c906108c | 837 | |
a75724bc PA |
838 | /* The target reports the exec event to the main thread, even if |
839 | some other thread does the exec, and even if the main thread was | |
840 | already stopped --- if debugging in non-stop mode, it's possible | |
841 | the user had the main thread held stopped in the previous image | |
842 | --- release it now. This is the same behavior as step-over-exec | |
843 | with scheduler-locking on in all-stop mode. */ | |
844 | th->stop_requested = 0; | |
845 | ||
1777feb0 | 846 | /* What is this a.out's name? */ |
6c95b8df PA |
847 | printf_unfiltered (_("%s is executing new program: %s\n"), |
848 | target_pid_to_str (inferior_ptid), | |
849 | execd_pathname); | |
c906108c SS |
850 | |
851 | /* We've followed the inferior through an exec. Therefore, the | |
1777feb0 | 852 | inferior has essentially been killed & reborn. */ |
7a292a7a | 853 | |
c906108c | 854 | gdb_flush (gdb_stdout); |
6ca15a4b PA |
855 | |
856 | breakpoint_init_inferior (inf_execd); | |
e85a822c DJ |
857 | |
858 | if (gdb_sysroot && *gdb_sysroot) | |
859 | { | |
860 | char *name = alloca (strlen (gdb_sysroot) | |
861 | + strlen (execd_pathname) | |
862 | + 1); | |
abbb1732 | 863 | |
e85a822c DJ |
864 | strcpy (name, gdb_sysroot); |
865 | strcat (name, execd_pathname); | |
866 | execd_pathname = name; | |
867 | } | |
c906108c | 868 | |
cce9b6bf PA |
869 | /* Reset the shared library package. This ensures that we get a |
870 | shlib event when the child reaches "_start", at which point the | |
871 | dld will have had a chance to initialize the child. */ | |
872 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
873 | we don't want those to be satisfied by the libraries of the | |
874 | previous incarnation of this process. */ | |
875 | no_shared_libraries (NULL, 0); | |
876 | ||
6c95b8df PA |
877 | if (follow_exec_mode_string == follow_exec_mode_new) |
878 | { | |
879 | struct program_space *pspace; | |
6c95b8df PA |
880 | |
881 | /* The user wants to keep the old inferior and program spaces | |
882 | around. Create a new fresh one, and switch to it. */ | |
883 | ||
884 | inf = add_inferior (current_inferior ()->pid); | |
885 | pspace = add_program_space (maybe_new_address_space ()); | |
886 | inf->pspace = pspace; | |
887 | inf->aspace = pspace->aspace; | |
888 | ||
889 | exit_inferior_num_silent (current_inferior ()->num); | |
890 | ||
891 | set_current_inferior (inf); | |
892 | set_current_program_space (pspace); | |
893 | } | |
894 | ||
895 | gdb_assert (current_program_space == inf->pspace); | |
896 | ||
1777feb0 | 897 | /* That a.out is now the one to use. */ |
6c95b8df PA |
898 | exec_file_attach (execd_pathname, 0); |
899 | ||
c1e56572 JK |
900 | /* SYMFILE_DEFER_BP_RESET is used as the proper displacement for PIE |
901 | (Position Independent Executable) main symbol file will get applied by | |
902 | solib_create_inferior_hook below. breakpoint_re_set would fail to insert | |
903 | the breakpoints with the zero displacement. */ | |
904 | ||
905 | symbol_file_add (execd_pathname, SYMFILE_MAINLINE | SYMFILE_DEFER_BP_RESET, | |
906 | NULL, 0); | |
907 | ||
908 | set_initial_language (); | |
c906108c | 909 | |
7a292a7a | 910 | #ifdef SOLIB_CREATE_INFERIOR_HOOK |
39f77062 | 911 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
a77053c2 | 912 | #else |
268a4a75 | 913 | solib_create_inferior_hook (0); |
7a292a7a | 914 | #endif |
c906108c | 915 | |
4efc6507 DE |
916 | jit_inferior_created_hook (); |
917 | ||
c1e56572 JK |
918 | breakpoint_re_set (); |
919 | ||
c906108c SS |
920 | /* Reinsert all breakpoints. (Those which were symbolic have |
921 | been reset to the proper address in the new a.out, thanks | |
1777feb0 | 922 | to symbol_file_command...). */ |
c906108c SS |
923 | insert_breakpoints (); |
924 | ||
925 | /* The next resume of this inferior should bring it to the shlib | |
926 | startup breakpoints. (If the user had also set bp's on | |
927 | "main" from the old (parent) process, then they'll auto- | |
1777feb0 | 928 | matically get reset there in the new process.). */ |
c906108c SS |
929 | } |
930 | ||
931 | /* Non-zero if we just simulating a single-step. This is needed | |
932 | because we cannot remove the breakpoints in the inferior process | |
933 | until after the `wait' in `wait_for_inferior'. */ | |
934 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
935 | |
936 | /* The thread we inserted single-step breakpoints for. */ | |
937 | static ptid_t singlestep_ptid; | |
938 | ||
fd48f117 DJ |
939 | /* PC when we started this single-step. */ |
940 | static CORE_ADDR singlestep_pc; | |
941 | ||
9f976b41 DJ |
942 | /* If another thread hit the singlestep breakpoint, we save the original |
943 | thread here so that we can resume single-stepping it later. */ | |
944 | static ptid_t saved_singlestep_ptid; | |
945 | static int stepping_past_singlestep_breakpoint; | |
6a6b96b9 | 946 | |
ca67fcb8 VP |
947 | /* If not equal to null_ptid, this means that after stepping over breakpoint |
948 | is finished, we need to switch to deferred_step_ptid, and step it. | |
949 | ||
950 | The use case is when one thread has hit a breakpoint, and then the user | |
1777feb0 | 951 | has switched to another thread and issued 'step'. We need to step over |
ca67fcb8 VP |
952 | breakpoint in the thread which hit the breakpoint, but then continue |
953 | stepping the thread user has selected. */ | |
954 | static ptid_t deferred_step_ptid; | |
c906108c | 955 | \f |
237fc4c9 PA |
956 | /* Displaced stepping. */ |
957 | ||
958 | /* In non-stop debugging mode, we must take special care to manage | |
959 | breakpoints properly; in particular, the traditional strategy for | |
960 | stepping a thread past a breakpoint it has hit is unsuitable. | |
961 | 'Displaced stepping' is a tactic for stepping one thread past a | |
962 | breakpoint it has hit while ensuring that other threads running | |
963 | concurrently will hit the breakpoint as they should. | |
964 | ||
965 | The traditional way to step a thread T off a breakpoint in a | |
966 | multi-threaded program in all-stop mode is as follows: | |
967 | ||
968 | a0) Initially, all threads are stopped, and breakpoints are not | |
969 | inserted. | |
970 | a1) We single-step T, leaving breakpoints uninserted. | |
971 | a2) We insert breakpoints, and resume all threads. | |
972 | ||
973 | In non-stop debugging, however, this strategy is unsuitable: we | |
974 | don't want to have to stop all threads in the system in order to | |
975 | continue or step T past a breakpoint. Instead, we use displaced | |
976 | stepping: | |
977 | ||
978 | n0) Initially, T is stopped, other threads are running, and | |
979 | breakpoints are inserted. | |
980 | n1) We copy the instruction "under" the breakpoint to a separate | |
981 | location, outside the main code stream, making any adjustments | |
982 | to the instruction, register, and memory state as directed by | |
983 | T's architecture. | |
984 | n2) We single-step T over the instruction at its new location. | |
985 | n3) We adjust the resulting register and memory state as directed | |
986 | by T's architecture. This includes resetting T's PC to point | |
987 | back into the main instruction stream. | |
988 | n4) We resume T. | |
989 | ||
990 | This approach depends on the following gdbarch methods: | |
991 | ||
992 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
993 | indicate where to copy the instruction, and how much space must | |
994 | be reserved there. We use these in step n1. | |
995 | ||
996 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
997 | address, and makes any necessary adjustments to the instruction, | |
998 | register contents, and memory. We use this in step n1. | |
999 | ||
1000 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
1001 | we have successfuly single-stepped the instruction, to yield the | |
1002 | same effect the instruction would have had if we had executed it | |
1003 | at its original address. We use this in step n3. | |
1004 | ||
1005 | - gdbarch_displaced_step_free_closure provides cleanup. | |
1006 | ||
1007 | The gdbarch_displaced_step_copy_insn and | |
1008 | gdbarch_displaced_step_fixup functions must be written so that | |
1009 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
1010 | single-stepping across the copied instruction, and then applying | |
1011 | gdbarch_displaced_insn_fixup should have the same effects on the | |
1012 | thread's memory and registers as stepping the instruction in place | |
1013 | would have. Exactly which responsibilities fall to the copy and | |
1014 | which fall to the fixup is up to the author of those functions. | |
1015 | ||
1016 | See the comments in gdbarch.sh for details. | |
1017 | ||
1018 | Note that displaced stepping and software single-step cannot | |
1019 | currently be used in combination, although with some care I think | |
1020 | they could be made to. Software single-step works by placing | |
1021 | breakpoints on all possible subsequent instructions; if the | |
1022 | displaced instruction is a PC-relative jump, those breakpoints | |
1023 | could fall in very strange places --- on pages that aren't | |
1024 | executable, or at addresses that are not proper instruction | |
1025 | boundaries. (We do generally let other threads run while we wait | |
1026 | to hit the software single-step breakpoint, and they might | |
1027 | encounter such a corrupted instruction.) One way to work around | |
1028 | this would be to have gdbarch_displaced_step_copy_insn fully | |
1029 | simulate the effect of PC-relative instructions (and return NULL) | |
1030 | on architectures that use software single-stepping. | |
1031 | ||
1032 | In non-stop mode, we can have independent and simultaneous step | |
1033 | requests, so more than one thread may need to simultaneously step | |
1034 | over a breakpoint. The current implementation assumes there is | |
1035 | only one scratch space per process. In this case, we have to | |
1036 | serialize access to the scratch space. If thread A wants to step | |
1037 | over a breakpoint, but we are currently waiting for some other | |
1038 | thread to complete a displaced step, we leave thread A stopped and | |
1039 | place it in the displaced_step_request_queue. Whenever a displaced | |
1040 | step finishes, we pick the next thread in the queue and start a new | |
1041 | displaced step operation on it. See displaced_step_prepare and | |
1042 | displaced_step_fixup for details. */ | |
1043 | ||
237fc4c9 PA |
1044 | struct displaced_step_request |
1045 | { | |
1046 | ptid_t ptid; | |
1047 | struct displaced_step_request *next; | |
1048 | }; | |
1049 | ||
fc1cf338 PA |
1050 | /* Per-inferior displaced stepping state. */ |
1051 | struct displaced_step_inferior_state | |
1052 | { | |
1053 | /* Pointer to next in linked list. */ | |
1054 | struct displaced_step_inferior_state *next; | |
1055 | ||
1056 | /* The process this displaced step state refers to. */ | |
1057 | int pid; | |
1058 | ||
1059 | /* A queue of pending displaced stepping requests. One entry per | |
1060 | thread that needs to do a displaced step. */ | |
1061 | struct displaced_step_request *step_request_queue; | |
1062 | ||
1063 | /* If this is not null_ptid, this is the thread carrying out a | |
1064 | displaced single-step in process PID. This thread's state will | |
1065 | require fixing up once it has completed its step. */ | |
1066 | ptid_t step_ptid; | |
1067 | ||
1068 | /* The architecture the thread had when we stepped it. */ | |
1069 | struct gdbarch *step_gdbarch; | |
1070 | ||
1071 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
1072 | for post-step cleanup. */ | |
1073 | struct displaced_step_closure *step_closure; | |
1074 | ||
1075 | /* The address of the original instruction, and the copy we | |
1076 | made. */ | |
1077 | CORE_ADDR step_original, step_copy; | |
1078 | ||
1079 | /* Saved contents of copy area. */ | |
1080 | gdb_byte *step_saved_copy; | |
1081 | }; | |
1082 | ||
1083 | /* The list of states of processes involved in displaced stepping | |
1084 | presently. */ | |
1085 | static struct displaced_step_inferior_state *displaced_step_inferior_states; | |
1086 | ||
1087 | /* Get the displaced stepping state of process PID. */ | |
1088 | ||
1089 | static struct displaced_step_inferior_state * | |
1090 | get_displaced_stepping_state (int pid) | |
1091 | { | |
1092 | struct displaced_step_inferior_state *state; | |
1093 | ||
1094 | for (state = displaced_step_inferior_states; | |
1095 | state != NULL; | |
1096 | state = state->next) | |
1097 | if (state->pid == pid) | |
1098 | return state; | |
1099 | ||
1100 | return NULL; | |
1101 | } | |
1102 | ||
1103 | /* Add a new displaced stepping state for process PID to the displaced | |
1104 | stepping state list, or return a pointer to an already existing | |
1105 | entry, if it already exists. Never returns NULL. */ | |
1106 | ||
1107 | static struct displaced_step_inferior_state * | |
1108 | add_displaced_stepping_state (int pid) | |
1109 | { | |
1110 | struct displaced_step_inferior_state *state; | |
1111 | ||
1112 | for (state = displaced_step_inferior_states; | |
1113 | state != NULL; | |
1114 | state = state->next) | |
1115 | if (state->pid == pid) | |
1116 | return state; | |
237fc4c9 | 1117 | |
fc1cf338 PA |
1118 | state = xcalloc (1, sizeof (*state)); |
1119 | state->pid = pid; | |
1120 | state->next = displaced_step_inferior_states; | |
1121 | displaced_step_inferior_states = state; | |
237fc4c9 | 1122 | |
fc1cf338 PA |
1123 | return state; |
1124 | } | |
1125 | ||
a42244db YQ |
1126 | /* If inferior is in displaced stepping, and ADDR equals to starting address |
1127 | of copy area, return corresponding displaced_step_closure. Otherwise, | |
1128 | return NULL. */ | |
1129 | ||
1130 | struct displaced_step_closure* | |
1131 | get_displaced_step_closure_by_addr (CORE_ADDR addr) | |
1132 | { | |
1133 | struct displaced_step_inferior_state *displaced | |
1134 | = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); | |
1135 | ||
1136 | /* If checking the mode of displaced instruction in copy area. */ | |
1137 | if (displaced && !ptid_equal (displaced->step_ptid, null_ptid) | |
1138 | && (displaced->step_copy == addr)) | |
1139 | return displaced->step_closure; | |
1140 | ||
1141 | return NULL; | |
1142 | } | |
1143 | ||
fc1cf338 | 1144 | /* Remove the displaced stepping state of process PID. */ |
237fc4c9 | 1145 | |
fc1cf338 PA |
1146 | static void |
1147 | remove_displaced_stepping_state (int pid) | |
1148 | { | |
1149 | struct displaced_step_inferior_state *it, **prev_next_p; | |
237fc4c9 | 1150 | |
fc1cf338 PA |
1151 | gdb_assert (pid != 0); |
1152 | ||
1153 | it = displaced_step_inferior_states; | |
1154 | prev_next_p = &displaced_step_inferior_states; | |
1155 | while (it) | |
1156 | { | |
1157 | if (it->pid == pid) | |
1158 | { | |
1159 | *prev_next_p = it->next; | |
1160 | xfree (it); | |
1161 | return; | |
1162 | } | |
1163 | ||
1164 | prev_next_p = &it->next; | |
1165 | it = *prev_next_p; | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | static void | |
1170 | infrun_inferior_exit (struct inferior *inf) | |
1171 | { | |
1172 | remove_displaced_stepping_state (inf->pid); | |
1173 | } | |
237fc4c9 | 1174 | |
fff08868 HZ |
1175 | /* Enum strings for "set|show displaced-stepping". */ |
1176 | ||
1177 | static const char can_use_displaced_stepping_auto[] = "auto"; | |
1178 | static const char can_use_displaced_stepping_on[] = "on"; | |
1179 | static const char can_use_displaced_stepping_off[] = "off"; | |
1180 | static const char *can_use_displaced_stepping_enum[] = | |
1181 | { | |
1182 | can_use_displaced_stepping_auto, | |
1183 | can_use_displaced_stepping_on, | |
1184 | can_use_displaced_stepping_off, | |
1185 | NULL, | |
1186 | }; | |
1187 | ||
1188 | /* If ON, and the architecture supports it, GDB will use displaced | |
1189 | stepping to step over breakpoints. If OFF, or if the architecture | |
1190 | doesn't support it, GDB will instead use the traditional | |
1191 | hold-and-step approach. If AUTO (which is the default), GDB will | |
1192 | decide which technique to use to step over breakpoints depending on | |
1193 | which of all-stop or non-stop mode is active --- displaced stepping | |
1194 | in non-stop mode; hold-and-step in all-stop mode. */ | |
1195 | ||
1196 | static const char *can_use_displaced_stepping = | |
1197 | can_use_displaced_stepping_auto; | |
1198 | ||
237fc4c9 PA |
1199 | static void |
1200 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
1201 | struct cmd_list_element *c, | |
1202 | const char *value) | |
1203 | { | |
fff08868 | 1204 | if (can_use_displaced_stepping == can_use_displaced_stepping_auto) |
3e43a32a MS |
1205 | fprintf_filtered (file, |
1206 | _("Debugger's willingness to use displaced stepping " | |
1207 | "to step over breakpoints is %s (currently %s).\n"), | |
fff08868 HZ |
1208 | value, non_stop ? "on" : "off"); |
1209 | else | |
3e43a32a MS |
1210 | fprintf_filtered (file, |
1211 | _("Debugger's willingness to use displaced stepping " | |
1212 | "to step over breakpoints is %s.\n"), value); | |
237fc4c9 PA |
1213 | } |
1214 | ||
fff08868 HZ |
1215 | /* Return non-zero if displaced stepping can/should be used to step |
1216 | over breakpoints. */ | |
1217 | ||
237fc4c9 PA |
1218 | static int |
1219 | use_displaced_stepping (struct gdbarch *gdbarch) | |
1220 | { | |
fff08868 HZ |
1221 | return (((can_use_displaced_stepping == can_use_displaced_stepping_auto |
1222 | && non_stop) | |
1223 | || can_use_displaced_stepping == can_use_displaced_stepping_on) | |
96429cc8 HZ |
1224 | && gdbarch_displaced_step_copy_insn_p (gdbarch) |
1225 | && !RECORD_IS_USED); | |
237fc4c9 PA |
1226 | } |
1227 | ||
1228 | /* Clean out any stray displaced stepping state. */ | |
1229 | static void | |
fc1cf338 | 1230 | displaced_step_clear (struct displaced_step_inferior_state *displaced) |
237fc4c9 PA |
1231 | { |
1232 | /* Indicate that there is no cleanup pending. */ | |
fc1cf338 | 1233 | displaced->step_ptid = null_ptid; |
237fc4c9 | 1234 | |
fc1cf338 | 1235 | if (displaced->step_closure) |
237fc4c9 | 1236 | { |
fc1cf338 PA |
1237 | gdbarch_displaced_step_free_closure (displaced->step_gdbarch, |
1238 | displaced->step_closure); | |
1239 | displaced->step_closure = NULL; | |
237fc4c9 PA |
1240 | } |
1241 | } | |
1242 | ||
1243 | static void | |
fc1cf338 | 1244 | displaced_step_clear_cleanup (void *arg) |
237fc4c9 | 1245 | { |
fc1cf338 PA |
1246 | struct displaced_step_inferior_state *state = arg; |
1247 | ||
1248 | displaced_step_clear (state); | |
237fc4c9 PA |
1249 | } |
1250 | ||
1251 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
1252 | void | |
1253 | displaced_step_dump_bytes (struct ui_file *file, | |
1254 | const gdb_byte *buf, | |
1255 | size_t len) | |
1256 | { | |
1257 | int i; | |
1258 | ||
1259 | for (i = 0; i < len; i++) | |
1260 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
1261 | fputs_unfiltered ("\n", file); | |
1262 | } | |
1263 | ||
1264 | /* Prepare to single-step, using displaced stepping. | |
1265 | ||
1266 | Note that we cannot use displaced stepping when we have a signal to | |
1267 | deliver. If we have a signal to deliver and an instruction to step | |
1268 | over, then after the step, there will be no indication from the | |
1269 | target whether the thread entered a signal handler or ignored the | |
1270 | signal and stepped over the instruction successfully --- both cases | |
1271 | result in a simple SIGTRAP. In the first case we mustn't do a | |
1272 | fixup, and in the second case we must --- but we can't tell which. | |
1273 | Comments in the code for 'random signals' in handle_inferior_event | |
1274 | explain how we handle this case instead. | |
1275 | ||
1276 | Returns 1 if preparing was successful -- this thread is going to be | |
1277 | stepped now; or 0 if displaced stepping this thread got queued. */ | |
1278 | static int | |
1279 | displaced_step_prepare (ptid_t ptid) | |
1280 | { | |
ad53cd71 | 1281 | struct cleanup *old_cleanups, *ignore_cleanups; |
237fc4c9 PA |
1282 | struct regcache *regcache = get_thread_regcache (ptid); |
1283 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1284 | CORE_ADDR original, copy; | |
1285 | ULONGEST len; | |
1286 | struct displaced_step_closure *closure; | |
fc1cf338 | 1287 | struct displaced_step_inferior_state *displaced; |
237fc4c9 PA |
1288 | |
1289 | /* We should never reach this function if the architecture does not | |
1290 | support displaced stepping. */ | |
1291 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
1292 | ||
fc1cf338 PA |
1293 | /* We have to displaced step one thread at a time, as we only have |
1294 | access to a single scratch space per inferior. */ | |
237fc4c9 | 1295 | |
fc1cf338 PA |
1296 | displaced = add_displaced_stepping_state (ptid_get_pid (ptid)); |
1297 | ||
1298 | if (!ptid_equal (displaced->step_ptid, null_ptid)) | |
237fc4c9 PA |
1299 | { |
1300 | /* Already waiting for a displaced step to finish. Defer this | |
1301 | request and place in queue. */ | |
1302 | struct displaced_step_request *req, *new_req; | |
1303 | ||
1304 | if (debug_displaced) | |
1305 | fprintf_unfiltered (gdb_stdlog, | |
1306 | "displaced: defering step of %s\n", | |
1307 | target_pid_to_str (ptid)); | |
1308 | ||
1309 | new_req = xmalloc (sizeof (*new_req)); | |
1310 | new_req->ptid = ptid; | |
1311 | new_req->next = NULL; | |
1312 | ||
fc1cf338 | 1313 | if (displaced->step_request_queue) |
237fc4c9 | 1314 | { |
fc1cf338 | 1315 | for (req = displaced->step_request_queue; |
237fc4c9 PA |
1316 | req && req->next; |
1317 | req = req->next) | |
1318 | ; | |
1319 | req->next = new_req; | |
1320 | } | |
1321 | else | |
fc1cf338 | 1322 | displaced->step_request_queue = new_req; |
237fc4c9 PA |
1323 | |
1324 | return 0; | |
1325 | } | |
1326 | else | |
1327 | { | |
1328 | if (debug_displaced) | |
1329 | fprintf_unfiltered (gdb_stdlog, | |
1330 | "displaced: stepping %s now\n", | |
1331 | target_pid_to_str (ptid)); | |
1332 | } | |
1333 | ||
fc1cf338 | 1334 | displaced_step_clear (displaced); |
237fc4c9 | 1335 | |
ad53cd71 PA |
1336 | old_cleanups = save_inferior_ptid (); |
1337 | inferior_ptid = ptid; | |
1338 | ||
515630c5 | 1339 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
1340 | |
1341 | copy = gdbarch_displaced_step_location (gdbarch); | |
1342 | len = gdbarch_max_insn_length (gdbarch); | |
1343 | ||
1344 | /* Save the original contents of the copy area. */ | |
fc1cf338 | 1345 | displaced->step_saved_copy = xmalloc (len); |
ad53cd71 | 1346 | ignore_cleanups = make_cleanup (free_current_contents, |
fc1cf338 PA |
1347 | &displaced->step_saved_copy); |
1348 | read_memory (copy, displaced->step_saved_copy, len); | |
237fc4c9 PA |
1349 | if (debug_displaced) |
1350 | { | |
5af949e3 UW |
1351 | fprintf_unfiltered (gdb_stdlog, "displaced: saved %s: ", |
1352 | paddress (gdbarch, copy)); | |
fc1cf338 PA |
1353 | displaced_step_dump_bytes (gdb_stdlog, |
1354 | displaced->step_saved_copy, | |
1355 | len); | |
237fc4c9 PA |
1356 | }; |
1357 | ||
1358 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
ad53cd71 | 1359 | original, copy, regcache); |
237fc4c9 PA |
1360 | |
1361 | /* We don't support the fully-simulated case at present. */ | |
1362 | gdb_assert (closure); | |
1363 | ||
9f5a595d UW |
1364 | /* Save the information we need to fix things up if the step |
1365 | succeeds. */ | |
fc1cf338 PA |
1366 | displaced->step_ptid = ptid; |
1367 | displaced->step_gdbarch = gdbarch; | |
1368 | displaced->step_closure = closure; | |
1369 | displaced->step_original = original; | |
1370 | displaced->step_copy = copy; | |
9f5a595d | 1371 | |
fc1cf338 | 1372 | make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 PA |
1373 | |
1374 | /* Resume execution at the copy. */ | |
515630c5 | 1375 | regcache_write_pc (regcache, copy); |
237fc4c9 | 1376 | |
ad53cd71 PA |
1377 | discard_cleanups (ignore_cleanups); |
1378 | ||
1379 | do_cleanups (old_cleanups); | |
237fc4c9 PA |
1380 | |
1381 | if (debug_displaced) | |
5af949e3 UW |
1382 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to %s\n", |
1383 | paddress (gdbarch, copy)); | |
237fc4c9 | 1384 | |
237fc4c9 PA |
1385 | return 1; |
1386 | } | |
1387 | ||
237fc4c9 | 1388 | static void |
3e43a32a MS |
1389 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, |
1390 | const gdb_byte *myaddr, int len) | |
237fc4c9 PA |
1391 | { |
1392 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
abbb1732 | 1393 | |
237fc4c9 PA |
1394 | inferior_ptid = ptid; |
1395 | write_memory (memaddr, myaddr, len); | |
1396 | do_cleanups (ptid_cleanup); | |
1397 | } | |
1398 | ||
e2d96639 YQ |
1399 | /* Restore the contents of the copy area for thread PTID. */ |
1400 | ||
1401 | static void | |
1402 | displaced_step_restore (struct displaced_step_inferior_state *displaced, | |
1403 | ptid_t ptid) | |
1404 | { | |
1405 | ULONGEST len = gdbarch_max_insn_length (displaced->step_gdbarch); | |
1406 | ||
1407 | write_memory_ptid (ptid, displaced->step_copy, | |
1408 | displaced->step_saved_copy, len); | |
1409 | if (debug_displaced) | |
1410 | fprintf_unfiltered (gdb_stdlog, "displaced: restored %s %s\n", | |
1411 | target_pid_to_str (ptid), | |
1412 | paddress (displaced->step_gdbarch, | |
1413 | displaced->step_copy)); | |
1414 | } | |
1415 | ||
237fc4c9 PA |
1416 | static void |
1417 | displaced_step_fixup (ptid_t event_ptid, enum target_signal signal) | |
1418 | { | |
1419 | struct cleanup *old_cleanups; | |
fc1cf338 PA |
1420 | struct displaced_step_inferior_state *displaced |
1421 | = get_displaced_stepping_state (ptid_get_pid (event_ptid)); | |
1422 | ||
1423 | /* Was any thread of this process doing a displaced step? */ | |
1424 | if (displaced == NULL) | |
1425 | return; | |
237fc4c9 PA |
1426 | |
1427 | /* Was this event for the pid we displaced? */ | |
fc1cf338 PA |
1428 | if (ptid_equal (displaced->step_ptid, null_ptid) |
1429 | || ! ptid_equal (displaced->step_ptid, event_ptid)) | |
237fc4c9 PA |
1430 | return; |
1431 | ||
fc1cf338 | 1432 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, displaced); |
237fc4c9 | 1433 | |
e2d96639 | 1434 | displaced_step_restore (displaced, displaced->step_ptid); |
237fc4c9 PA |
1435 | |
1436 | /* Did the instruction complete successfully? */ | |
1437 | if (signal == TARGET_SIGNAL_TRAP) | |
1438 | { | |
1439 | /* Fix up the resulting state. */ | |
fc1cf338 PA |
1440 | gdbarch_displaced_step_fixup (displaced->step_gdbarch, |
1441 | displaced->step_closure, | |
1442 | displaced->step_original, | |
1443 | displaced->step_copy, | |
1444 | get_thread_regcache (displaced->step_ptid)); | |
237fc4c9 PA |
1445 | } |
1446 | else | |
1447 | { | |
1448 | /* Since the instruction didn't complete, all we can do is | |
1449 | relocate the PC. */ | |
515630c5 UW |
1450 | struct regcache *regcache = get_thread_regcache (event_ptid); |
1451 | CORE_ADDR pc = regcache_read_pc (regcache); | |
abbb1732 | 1452 | |
fc1cf338 | 1453 | pc = displaced->step_original + (pc - displaced->step_copy); |
515630c5 | 1454 | regcache_write_pc (regcache, pc); |
237fc4c9 PA |
1455 | } |
1456 | ||
1457 | do_cleanups (old_cleanups); | |
1458 | ||
fc1cf338 | 1459 | displaced->step_ptid = null_ptid; |
1c5cfe86 | 1460 | |
237fc4c9 | 1461 | /* Are there any pending displaced stepping requests? If so, run |
fc1cf338 PA |
1462 | one now. Leave the state object around, since we're likely to |
1463 | need it again soon. */ | |
1464 | while (displaced->step_request_queue) | |
237fc4c9 PA |
1465 | { |
1466 | struct displaced_step_request *head; | |
1467 | ptid_t ptid; | |
5af949e3 | 1468 | struct regcache *regcache; |
929dfd4f | 1469 | struct gdbarch *gdbarch; |
1c5cfe86 | 1470 | CORE_ADDR actual_pc; |
6c95b8df | 1471 | struct address_space *aspace; |
237fc4c9 | 1472 | |
fc1cf338 | 1473 | head = displaced->step_request_queue; |
237fc4c9 | 1474 | ptid = head->ptid; |
fc1cf338 | 1475 | displaced->step_request_queue = head->next; |
237fc4c9 PA |
1476 | xfree (head); |
1477 | ||
ad53cd71 PA |
1478 | context_switch (ptid); |
1479 | ||
5af949e3 UW |
1480 | regcache = get_thread_regcache (ptid); |
1481 | actual_pc = regcache_read_pc (regcache); | |
6c95b8df | 1482 | aspace = get_regcache_aspace (regcache); |
1c5cfe86 | 1483 | |
6c95b8df | 1484 | if (breakpoint_here_p (aspace, actual_pc)) |
ad53cd71 | 1485 | { |
1c5cfe86 PA |
1486 | if (debug_displaced) |
1487 | fprintf_unfiltered (gdb_stdlog, | |
1488 | "displaced: stepping queued %s now\n", | |
1489 | target_pid_to_str (ptid)); | |
1490 | ||
1491 | displaced_step_prepare (ptid); | |
1492 | ||
929dfd4f JB |
1493 | gdbarch = get_regcache_arch (regcache); |
1494 | ||
1c5cfe86 PA |
1495 | if (debug_displaced) |
1496 | { | |
929dfd4f | 1497 | CORE_ADDR actual_pc = regcache_read_pc (regcache); |
1c5cfe86 PA |
1498 | gdb_byte buf[4]; |
1499 | ||
5af949e3 UW |
1500 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", |
1501 | paddress (gdbarch, actual_pc)); | |
1c5cfe86 PA |
1502 | read_memory (actual_pc, buf, sizeof (buf)); |
1503 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1504 | } | |
1505 | ||
fc1cf338 PA |
1506 | if (gdbarch_displaced_step_hw_singlestep (gdbarch, |
1507 | displaced->step_closure)) | |
929dfd4f | 1508 | target_resume (ptid, 1, TARGET_SIGNAL_0); |
99e40580 UW |
1509 | else |
1510 | target_resume (ptid, 0, TARGET_SIGNAL_0); | |
1c5cfe86 PA |
1511 | |
1512 | /* Done, we're stepping a thread. */ | |
1513 | break; | |
ad53cd71 | 1514 | } |
1c5cfe86 PA |
1515 | else |
1516 | { | |
1517 | int step; | |
1518 | struct thread_info *tp = inferior_thread (); | |
1519 | ||
1520 | /* The breakpoint we were sitting under has since been | |
1521 | removed. */ | |
16c381f0 | 1522 | tp->control.trap_expected = 0; |
1c5cfe86 PA |
1523 | |
1524 | /* Go back to what we were trying to do. */ | |
1525 | step = currently_stepping (tp); | |
ad53cd71 | 1526 | |
1c5cfe86 | 1527 | if (debug_displaced) |
3e43a32a MS |
1528 | fprintf_unfiltered (gdb_stdlog, |
1529 | "breakpoint is gone %s: step(%d)\n", | |
1c5cfe86 PA |
1530 | target_pid_to_str (tp->ptid), step); |
1531 | ||
1532 | target_resume (ptid, step, TARGET_SIGNAL_0); | |
16c381f0 | 1533 | tp->suspend.stop_signal = TARGET_SIGNAL_0; |
1c5cfe86 PA |
1534 | |
1535 | /* This request was discarded. See if there's any other | |
1536 | thread waiting for its turn. */ | |
1537 | } | |
237fc4c9 PA |
1538 | } |
1539 | } | |
1540 | ||
5231c1fd PA |
1541 | /* Update global variables holding ptids to hold NEW_PTID if they were |
1542 | holding OLD_PTID. */ | |
1543 | static void | |
1544 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
1545 | { | |
1546 | struct displaced_step_request *it; | |
fc1cf338 | 1547 | struct displaced_step_inferior_state *displaced; |
5231c1fd PA |
1548 | |
1549 | if (ptid_equal (inferior_ptid, old_ptid)) | |
1550 | inferior_ptid = new_ptid; | |
1551 | ||
1552 | if (ptid_equal (singlestep_ptid, old_ptid)) | |
1553 | singlestep_ptid = new_ptid; | |
1554 | ||
5231c1fd PA |
1555 | if (ptid_equal (deferred_step_ptid, old_ptid)) |
1556 | deferred_step_ptid = new_ptid; | |
1557 | ||
fc1cf338 PA |
1558 | for (displaced = displaced_step_inferior_states; |
1559 | displaced; | |
1560 | displaced = displaced->next) | |
1561 | { | |
1562 | if (ptid_equal (displaced->step_ptid, old_ptid)) | |
1563 | displaced->step_ptid = new_ptid; | |
1564 | ||
1565 | for (it = displaced->step_request_queue; it; it = it->next) | |
1566 | if (ptid_equal (it->ptid, old_ptid)) | |
1567 | it->ptid = new_ptid; | |
1568 | } | |
5231c1fd PA |
1569 | } |
1570 | ||
237fc4c9 PA |
1571 | \f |
1572 | /* Resuming. */ | |
c906108c SS |
1573 | |
1574 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 1575 | static void |
74b7792f | 1576 | resume_cleanups (void *ignore) |
c906108c SS |
1577 | { |
1578 | normal_stop (); | |
1579 | } | |
1580 | ||
53904c9e AC |
1581 | static const char schedlock_off[] = "off"; |
1582 | static const char schedlock_on[] = "on"; | |
1583 | static const char schedlock_step[] = "step"; | |
488f131b | 1584 | static const char *scheduler_enums[] = { |
ef346e04 AC |
1585 | schedlock_off, |
1586 | schedlock_on, | |
1587 | schedlock_step, | |
1588 | NULL | |
1589 | }; | |
920d2a44 AC |
1590 | static const char *scheduler_mode = schedlock_off; |
1591 | static void | |
1592 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
1593 | struct cmd_list_element *c, const char *value) | |
1594 | { | |
3e43a32a MS |
1595 | fprintf_filtered (file, |
1596 | _("Mode for locking scheduler " | |
1597 | "during execution is \"%s\".\n"), | |
920d2a44 AC |
1598 | value); |
1599 | } | |
c906108c SS |
1600 | |
1601 | static void | |
96baa820 | 1602 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 1603 | { |
eefe576e AC |
1604 | if (!target_can_lock_scheduler) |
1605 | { | |
1606 | scheduler_mode = schedlock_off; | |
1607 | error (_("Target '%s' cannot support this command."), target_shortname); | |
1608 | } | |
c906108c SS |
1609 | } |
1610 | ||
d4db2f36 PA |
1611 | /* True if execution commands resume all threads of all processes by |
1612 | default; otherwise, resume only threads of the current inferior | |
1613 | process. */ | |
1614 | int sched_multi = 0; | |
1615 | ||
2facfe5c DD |
1616 | /* Try to setup for software single stepping over the specified location. |
1617 | Return 1 if target_resume() should use hardware single step. | |
1618 | ||
1619 | GDBARCH the current gdbarch. | |
1620 | PC the location to step over. */ | |
1621 | ||
1622 | static int | |
1623 | maybe_software_singlestep (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1624 | { | |
1625 | int hw_step = 1; | |
1626 | ||
f02253f1 HZ |
1627 | if (execution_direction == EXEC_FORWARD |
1628 | && gdbarch_software_single_step_p (gdbarch) | |
99e40580 | 1629 | && gdbarch_software_single_step (gdbarch, get_current_frame ())) |
2facfe5c | 1630 | { |
99e40580 UW |
1631 | hw_step = 0; |
1632 | /* Do not pull these breakpoints until after a `wait' in | |
1777feb0 | 1633 | `wait_for_inferior'. */ |
99e40580 UW |
1634 | singlestep_breakpoints_inserted_p = 1; |
1635 | singlestep_ptid = inferior_ptid; | |
1636 | singlestep_pc = pc; | |
2facfe5c DD |
1637 | } |
1638 | return hw_step; | |
1639 | } | |
c906108c | 1640 | |
09cee04b PA |
1641 | /* Return a ptid representing the set of threads that we will proceed, |
1642 | in the perspective of the user/frontend. We may actually resume | |
1643 | fewer threads at first, e.g., if a thread is stopped at a | |
b136cd05 PA |
1644 | breakpoint that needs stepping-off, but that should not be visible |
1645 | to the user/frontend, and neither should the frontend/user be | |
1646 | allowed to proceed any of the threads that happen to be stopped for | |
09cee04b PA |
1647 | internal run control handling, if a previous command wanted them |
1648 | resumed. */ | |
1649 | ||
1650 | ptid_t | |
1651 | user_visible_resume_ptid (int step) | |
1652 | { | |
1653 | /* By default, resume all threads of all processes. */ | |
1654 | ptid_t resume_ptid = RESUME_ALL; | |
1655 | ||
1656 | /* Maybe resume only all threads of the current process. */ | |
1657 | if (!sched_multi && target_supports_multi_process ()) | |
1658 | { | |
1659 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
1660 | } | |
1661 | ||
1662 | /* Maybe resume a single thread after all. */ | |
1663 | if (non_stop) | |
1664 | { | |
1665 | /* With non-stop mode on, threads are always handled | |
1666 | individually. */ | |
1667 | resume_ptid = inferior_ptid; | |
1668 | } | |
1669 | else if ((scheduler_mode == schedlock_on) | |
1670 | || (scheduler_mode == schedlock_step | |
1671 | && (step || singlestep_breakpoints_inserted_p))) | |
1672 | { | |
1673 | /* User-settable 'scheduler' mode requires solo thread resume. */ | |
1674 | resume_ptid = inferior_ptid; | |
1675 | } | |
1676 | ||
1677 | return resume_ptid; | |
1678 | } | |
1679 | ||
c906108c SS |
1680 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
1681 | wants to interrupt some lengthy single-stepping operation | |
1682 | (for child processes, the SIGINT goes to the inferior, and so | |
1683 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
1684 | other targets, that's not true). | |
1685 | ||
1686 | STEP nonzero if we should step (zero to continue instead). | |
1687 | SIG is the signal to give the inferior (zero for none). */ | |
1688 | void | |
96baa820 | 1689 | resume (int step, enum target_signal sig) |
c906108c SS |
1690 | { |
1691 | int should_resume = 1; | |
74b7792f | 1692 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
1693 | struct regcache *regcache = get_current_regcache (); |
1694 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4e1c45ea | 1695 | struct thread_info *tp = inferior_thread (); |
515630c5 | 1696 | CORE_ADDR pc = regcache_read_pc (regcache); |
6c95b8df | 1697 | struct address_space *aspace = get_regcache_aspace (regcache); |
c7e8a53c | 1698 | |
c906108c SS |
1699 | QUIT; |
1700 | ||
74609e71 YQ |
1701 | if (current_inferior ()->waiting_for_vfork_done) |
1702 | { | |
48f9886d PA |
1703 | /* Don't try to single-step a vfork parent that is waiting for |
1704 | the child to get out of the shared memory region (by exec'ing | |
1705 | or exiting). This is particularly important on software | |
1706 | single-step archs, as the child process would trip on the | |
1707 | software single step breakpoint inserted for the parent | |
1708 | process. Since the parent will not actually execute any | |
1709 | instruction until the child is out of the shared region (such | |
1710 | are vfork's semantics), it is safe to simply continue it. | |
1711 | Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for | |
1712 | the parent, and tell it to `keep_going', which automatically | |
1713 | re-sets it stepping. */ | |
74609e71 YQ |
1714 | if (debug_infrun) |
1715 | fprintf_unfiltered (gdb_stdlog, | |
1716 | "infrun: resume : clear step\n"); | |
1717 | step = 0; | |
1718 | } | |
1719 | ||
527159b7 | 1720 | if (debug_infrun) |
237fc4c9 PA |
1721 | fprintf_unfiltered (gdb_stdlog, |
1722 | "infrun: resume (step=%d, signal=%d), " | |
0d9a9a5f PA |
1723 | "trap_expected=%d, current thread [%s] at %s\n", |
1724 | step, sig, tp->control.trap_expected, | |
1725 | target_pid_to_str (inferior_ptid), | |
1726 | paddress (gdbarch, pc)); | |
c906108c | 1727 | |
c2c6d25f JM |
1728 | /* Normally, by the time we reach `resume', the breakpoints are either |
1729 | removed or inserted, as appropriate. The exception is if we're sitting | |
1730 | at a permanent breakpoint; we need to step over it, but permanent | |
1731 | breakpoints can't be removed. So we have to test for it here. */ | |
6c95b8df | 1732 | if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here) |
6d350bb5 | 1733 | { |
515630c5 UW |
1734 | if (gdbarch_skip_permanent_breakpoint_p (gdbarch)) |
1735 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
6d350bb5 | 1736 | else |
ac74f770 MS |
1737 | error (_("\ |
1738 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
1739 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
1740 | a command like `return' or `jump' to continue execution.")); | |
6d350bb5 | 1741 | } |
c2c6d25f | 1742 | |
237fc4c9 PA |
1743 | /* If enabled, step over breakpoints by executing a copy of the |
1744 | instruction at a different address. | |
1745 | ||
1746 | We can't use displaced stepping when we have a signal to deliver; | |
1747 | the comments for displaced_step_prepare explain why. The | |
1748 | comments in the handle_inferior event for dealing with 'random | |
74609e71 YQ |
1749 | signals' explain what we do instead. |
1750 | ||
1751 | We can't use displaced stepping when we are waiting for vfork_done | |
1752 | event, displaced stepping breaks the vfork child similarly as single | |
1753 | step software breakpoint. */ | |
515630c5 | 1754 | if (use_displaced_stepping (gdbarch) |
16c381f0 | 1755 | && (tp->control.trap_expected |
929dfd4f | 1756 | || (step && gdbarch_software_single_step_p (gdbarch))) |
74609e71 YQ |
1757 | && sig == TARGET_SIGNAL_0 |
1758 | && !current_inferior ()->waiting_for_vfork_done) | |
237fc4c9 | 1759 | { |
fc1cf338 PA |
1760 | struct displaced_step_inferior_state *displaced; |
1761 | ||
237fc4c9 | 1762 | if (!displaced_step_prepare (inferior_ptid)) |
d56b7306 VP |
1763 | { |
1764 | /* Got placed in displaced stepping queue. Will be resumed | |
1765 | later when all the currently queued displaced stepping | |
7f7efbd9 VP |
1766 | requests finish. The thread is not executing at this point, |
1767 | and the call to set_executing will be made later. But we | |
1768 | need to call set_running here, since from frontend point of view, | |
1769 | the thread is running. */ | |
1770 | set_running (inferior_ptid, 1); | |
d56b7306 VP |
1771 | discard_cleanups (old_cleanups); |
1772 | return; | |
1773 | } | |
99e40580 | 1774 | |
fc1cf338 PA |
1775 | displaced = get_displaced_stepping_state (ptid_get_pid (inferior_ptid)); |
1776 | step = gdbarch_displaced_step_hw_singlestep (gdbarch, | |
1777 | displaced->step_closure); | |
237fc4c9 PA |
1778 | } |
1779 | ||
2facfe5c | 1780 | /* Do we need to do it the hard way, w/temp breakpoints? */ |
99e40580 | 1781 | else if (step) |
2facfe5c | 1782 | step = maybe_software_singlestep (gdbarch, pc); |
c906108c | 1783 | |
30852783 UW |
1784 | /* Currently, our software single-step implementation leads to different |
1785 | results than hardware single-stepping in one situation: when stepping | |
1786 | into delivering a signal which has an associated signal handler, | |
1787 | hardware single-step will stop at the first instruction of the handler, | |
1788 | while software single-step will simply skip execution of the handler. | |
1789 | ||
1790 | For now, this difference in behavior is accepted since there is no | |
1791 | easy way to actually implement single-stepping into a signal handler | |
1792 | without kernel support. | |
1793 | ||
1794 | However, there is one scenario where this difference leads to follow-on | |
1795 | problems: if we're stepping off a breakpoint by removing all breakpoints | |
1796 | and then single-stepping. In this case, the software single-step | |
1797 | behavior means that even if there is a *breakpoint* in the signal | |
1798 | handler, GDB still would not stop. | |
1799 | ||
1800 | Fortunately, we can at least fix this particular issue. We detect | |
1801 | here the case where we are about to deliver a signal while software | |
1802 | single-stepping with breakpoints removed. In this situation, we | |
1803 | revert the decisions to remove all breakpoints and insert single- | |
1804 | step breakpoints, and instead we install a step-resume breakpoint | |
1805 | at the current address, deliver the signal without stepping, and | |
1806 | once we arrive back at the step-resume breakpoint, actually step | |
1807 | over the breakpoint we originally wanted to step over. */ | |
1808 | if (singlestep_breakpoints_inserted_p | |
1809 | && tp->control.trap_expected && sig != TARGET_SIGNAL_0) | |
1810 | { | |
1811 | /* If we have nested signals or a pending signal is delivered | |
1812 | immediately after a handler returns, might might already have | |
1813 | a step-resume breakpoint set on the earlier handler. We cannot | |
1814 | set another step-resume breakpoint; just continue on until the | |
1815 | original breakpoint is hit. */ | |
1816 | if (tp->control.step_resume_breakpoint == NULL) | |
1817 | { | |
2c03e5be | 1818 | insert_hp_step_resume_breakpoint_at_frame (get_current_frame ()); |
30852783 UW |
1819 | tp->step_after_step_resume_breakpoint = 1; |
1820 | } | |
1821 | ||
1822 | remove_single_step_breakpoints (); | |
1823 | singlestep_breakpoints_inserted_p = 0; | |
1824 | ||
1825 | insert_breakpoints (); | |
1826 | tp->control.trap_expected = 0; | |
1827 | } | |
1828 | ||
c906108c SS |
1829 | if (should_resume) |
1830 | { | |
39f77062 | 1831 | ptid_t resume_ptid; |
dfcd3bfb | 1832 | |
cd76b0b7 VP |
1833 | /* If STEP is set, it's a request to use hardware stepping |
1834 | facilities. But in that case, we should never | |
1835 | use singlestep breakpoint. */ | |
1836 | gdb_assert (!(singlestep_breakpoints_inserted_p && step)); | |
1837 | ||
d4db2f36 PA |
1838 | /* Decide the set of threads to ask the target to resume. Start |
1839 | by assuming everything will be resumed, than narrow the set | |
1840 | by applying increasingly restricting conditions. */ | |
09cee04b | 1841 | resume_ptid = user_visible_resume_ptid (step); |
d4db2f36 PA |
1842 | |
1843 | /* Maybe resume a single thread after all. */ | |
cd76b0b7 VP |
1844 | if (singlestep_breakpoints_inserted_p |
1845 | && stepping_past_singlestep_breakpoint) | |
c906108c | 1846 | { |
cd76b0b7 VP |
1847 | /* The situation here is as follows. In thread T1 we wanted to |
1848 | single-step. Lacking hardware single-stepping we've | |
1849 | set breakpoint at the PC of the next instruction -- call it | |
1850 | P. After resuming, we've hit that breakpoint in thread T2. | |
1851 | Now we've removed original breakpoint, inserted breakpoint | |
1852 | at P+1, and try to step to advance T2 past breakpoint. | |
1853 | We need to step only T2, as if T1 is allowed to freely run, | |
1854 | it can run past P, and if other threads are allowed to run, | |
1855 | they can hit breakpoint at P+1, and nested hits of single-step | |
1856 | breakpoints is not something we'd want -- that's complicated | |
1857 | to support, and has no value. */ | |
1858 | resume_ptid = inferior_ptid; | |
1859 | } | |
d4db2f36 | 1860 | else if ((step || singlestep_breakpoints_inserted_p) |
16c381f0 | 1861 | && tp->control.trap_expected) |
cd76b0b7 | 1862 | { |
74960c60 VP |
1863 | /* We're allowing a thread to run past a breakpoint it has |
1864 | hit, by single-stepping the thread with the breakpoint | |
1865 | removed. In which case, we need to single-step only this | |
1866 | thread, and keep others stopped, as they can miss this | |
1867 | breakpoint if allowed to run. | |
1868 | ||
1869 | The current code actually removes all breakpoints when | |
1870 | doing this, not just the one being stepped over, so if we | |
1871 | let other threads run, we can actually miss any | |
1872 | breakpoint, not just the one at PC. */ | |
ef5cf84e | 1873 | resume_ptid = inferior_ptid; |
c906108c | 1874 | } |
ef5cf84e | 1875 | |
515630c5 | 1876 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4ed33b9 AC |
1877 | { |
1878 | /* Most targets can step a breakpoint instruction, thus | |
1879 | executing it normally. But if this one cannot, just | |
1880 | continue and we will hit it anyway. */ | |
6c95b8df | 1881 | if (step && breakpoint_inserted_here_p (aspace, pc)) |
c4ed33b9 AC |
1882 | step = 0; |
1883 | } | |
237fc4c9 PA |
1884 | |
1885 | if (debug_displaced | |
515630c5 | 1886 | && use_displaced_stepping (gdbarch) |
16c381f0 | 1887 | && tp->control.trap_expected) |
237fc4c9 | 1888 | { |
515630c5 | 1889 | struct regcache *resume_regcache = get_thread_regcache (resume_ptid); |
5af949e3 | 1890 | struct gdbarch *resume_gdbarch = get_regcache_arch (resume_regcache); |
515630c5 | 1891 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); |
237fc4c9 PA |
1892 | gdb_byte buf[4]; |
1893 | ||
5af949e3 UW |
1894 | fprintf_unfiltered (gdb_stdlog, "displaced: run %s: ", |
1895 | paddress (resume_gdbarch, actual_pc)); | |
237fc4c9 PA |
1896 | read_memory (actual_pc, buf, sizeof (buf)); |
1897 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1898 | } | |
1899 | ||
e58b0e63 PA |
1900 | /* Install inferior's terminal modes. */ |
1901 | target_terminal_inferior (); | |
1902 | ||
2020b7ab PA |
1903 | /* Avoid confusing the next resume, if the next stop/resume |
1904 | happens to apply to another thread. */ | |
16c381f0 | 1905 | tp->suspend.stop_signal = TARGET_SIGNAL_0; |
607cecd2 | 1906 | |
2455069d UW |
1907 | /* Advise target which signals may be handled silently. If we have |
1908 | removed breakpoints because we are stepping over one (which can | |
1909 | happen only if we are not using displaced stepping), we need to | |
1910 | receive all signals to avoid accidentally skipping a breakpoint | |
1911 | during execution of a signal handler. */ | |
1912 | if ((step || singlestep_breakpoints_inserted_p) | |
1913 | && tp->control.trap_expected | |
1914 | && !use_displaced_stepping (gdbarch)) | |
1915 | target_pass_signals (0, NULL); | |
1916 | else | |
1917 | target_pass_signals ((int) TARGET_SIGNAL_LAST, signal_pass); | |
1918 | ||
607cecd2 | 1919 | target_resume (resume_ptid, step, sig); |
c906108c SS |
1920 | } |
1921 | ||
1922 | discard_cleanups (old_cleanups); | |
1923 | } | |
1924 | \f | |
237fc4c9 | 1925 | /* Proceeding. */ |
c906108c SS |
1926 | |
1927 | /* Clear out all variables saying what to do when inferior is continued. | |
1928 | First do this, then set the ones you want, then call `proceed'. */ | |
1929 | ||
a7212384 UW |
1930 | static void |
1931 | clear_proceed_status_thread (struct thread_info *tp) | |
c906108c | 1932 | { |
a7212384 UW |
1933 | if (debug_infrun) |
1934 | fprintf_unfiltered (gdb_stdlog, | |
1935 | "infrun: clear_proceed_status_thread (%s)\n", | |
1936 | target_pid_to_str (tp->ptid)); | |
d6b48e9c | 1937 | |
16c381f0 JK |
1938 | tp->control.trap_expected = 0; |
1939 | tp->control.step_range_start = 0; | |
1940 | tp->control.step_range_end = 0; | |
1941 | tp->control.step_frame_id = null_frame_id; | |
1942 | tp->control.step_stack_frame_id = null_frame_id; | |
1943 | tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE; | |
a7212384 | 1944 | tp->stop_requested = 0; |
4e1c45ea | 1945 | |
16c381f0 | 1946 | tp->control.stop_step = 0; |
32400beb | 1947 | |
16c381f0 | 1948 | tp->control.proceed_to_finish = 0; |
414c69f7 | 1949 | |
a7212384 | 1950 | /* Discard any remaining commands or status from previous stop. */ |
16c381f0 | 1951 | bpstat_clear (&tp->control.stop_bpstat); |
a7212384 | 1952 | } |
32400beb | 1953 | |
a7212384 UW |
1954 | static int |
1955 | clear_proceed_status_callback (struct thread_info *tp, void *data) | |
1956 | { | |
1957 | if (is_exited (tp->ptid)) | |
1958 | return 0; | |
d6b48e9c | 1959 | |
a7212384 UW |
1960 | clear_proceed_status_thread (tp); |
1961 | return 0; | |
1962 | } | |
1963 | ||
1964 | void | |
1965 | clear_proceed_status (void) | |
1966 | { | |
6c95b8df PA |
1967 | if (!non_stop) |
1968 | { | |
1969 | /* In all-stop mode, delete the per-thread status of all | |
1970 | threads, even if inferior_ptid is null_ptid, there may be | |
1971 | threads on the list. E.g., we may be launching a new | |
1972 | process, while selecting the executable. */ | |
1973 | iterate_over_threads (clear_proceed_status_callback, NULL); | |
1974 | } | |
1975 | ||
a7212384 UW |
1976 | if (!ptid_equal (inferior_ptid, null_ptid)) |
1977 | { | |
1978 | struct inferior *inferior; | |
1979 | ||
1980 | if (non_stop) | |
1981 | { | |
6c95b8df PA |
1982 | /* If in non-stop mode, only delete the per-thread status of |
1983 | the current thread. */ | |
a7212384 UW |
1984 | clear_proceed_status_thread (inferior_thread ()); |
1985 | } | |
6c95b8df | 1986 | |
d6b48e9c | 1987 | inferior = current_inferior (); |
16c381f0 | 1988 | inferior->control.stop_soon = NO_STOP_QUIETLY; |
4e1c45ea PA |
1989 | } |
1990 | ||
c906108c | 1991 | stop_after_trap = 0; |
f3b1572e PA |
1992 | |
1993 | observer_notify_about_to_proceed (); | |
c906108c | 1994 | |
d5c31457 UW |
1995 | if (stop_registers) |
1996 | { | |
1997 | regcache_xfree (stop_registers); | |
1998 | stop_registers = NULL; | |
1999 | } | |
c906108c SS |
2000 | } |
2001 | ||
5a437975 DE |
2002 | /* Check the current thread against the thread that reported the most recent |
2003 | event. If a step-over is required return TRUE and set the current thread | |
2004 | to the old thread. Otherwise return FALSE. | |
2005 | ||
1777feb0 | 2006 | This should be suitable for any targets that support threads. */ |
ea67f13b DJ |
2007 | |
2008 | static int | |
6a6b96b9 | 2009 | prepare_to_proceed (int step) |
ea67f13b DJ |
2010 | { |
2011 | ptid_t wait_ptid; | |
2012 | struct target_waitstatus wait_status; | |
5a437975 DE |
2013 | int schedlock_enabled; |
2014 | ||
2015 | /* With non-stop mode on, threads are always handled individually. */ | |
2016 | gdb_assert (! non_stop); | |
ea67f13b DJ |
2017 | |
2018 | /* Get the last target status returned by target_wait(). */ | |
2019 | get_last_target_status (&wait_ptid, &wait_status); | |
2020 | ||
6a6b96b9 | 2021 | /* Make sure we were stopped at a breakpoint. */ |
ea67f13b | 2022 | if (wait_status.kind != TARGET_WAITKIND_STOPPED |
2b009048 DJ |
2023 | || (wait_status.value.sig != TARGET_SIGNAL_TRAP |
2024 | && wait_status.value.sig != TARGET_SIGNAL_ILL | |
2025 | && wait_status.value.sig != TARGET_SIGNAL_SEGV | |
2026 | && wait_status.value.sig != TARGET_SIGNAL_EMT)) | |
ea67f13b DJ |
2027 | { |
2028 | return 0; | |
2029 | } | |
2030 | ||
5a437975 DE |
2031 | schedlock_enabled = (scheduler_mode == schedlock_on |
2032 | || (scheduler_mode == schedlock_step | |
2033 | && step)); | |
2034 | ||
d4db2f36 PA |
2035 | /* Don't switch over to WAIT_PTID if scheduler locking is on. */ |
2036 | if (schedlock_enabled) | |
2037 | return 0; | |
2038 | ||
2039 | /* Don't switch over if we're about to resume some other process | |
2040 | other than WAIT_PTID's, and schedule-multiple is off. */ | |
2041 | if (!sched_multi | |
2042 | && ptid_get_pid (wait_ptid) != ptid_get_pid (inferior_ptid)) | |
2043 | return 0; | |
2044 | ||
6a6b96b9 | 2045 | /* Switched over from WAIT_PID. */ |
ea67f13b | 2046 | if (!ptid_equal (wait_ptid, minus_one_ptid) |
d4db2f36 | 2047 | && !ptid_equal (inferior_ptid, wait_ptid)) |
ea67f13b | 2048 | { |
515630c5 UW |
2049 | struct regcache *regcache = get_thread_regcache (wait_ptid); |
2050 | ||
6c95b8df PA |
2051 | if (breakpoint_here_p (get_regcache_aspace (regcache), |
2052 | regcache_read_pc (regcache))) | |
ea67f13b | 2053 | { |
515630c5 UW |
2054 | /* If stepping, remember current thread to switch back to. */ |
2055 | if (step) | |
2056 | deferred_step_ptid = inferior_ptid; | |
ea67f13b | 2057 | |
515630c5 UW |
2058 | /* Switch back to WAIT_PID thread. */ |
2059 | switch_to_thread (wait_ptid); | |
6a6b96b9 | 2060 | |
0d9a9a5f PA |
2061 | if (debug_infrun) |
2062 | fprintf_unfiltered (gdb_stdlog, | |
2063 | "infrun: prepare_to_proceed (step=%d), " | |
2064 | "switched to [%s]\n", | |
2065 | step, target_pid_to_str (inferior_ptid)); | |
2066 | ||
515630c5 UW |
2067 | /* We return 1 to indicate that there is a breakpoint here, |
2068 | so we need to step over it before continuing to avoid | |
1777feb0 | 2069 | hitting it straight away. */ |
515630c5 UW |
2070 | return 1; |
2071 | } | |
ea67f13b DJ |
2072 | } |
2073 | ||
2074 | return 0; | |
ea67f13b | 2075 | } |
e4846b08 | 2076 | |
c906108c SS |
2077 | /* Basic routine for continuing the program in various fashions. |
2078 | ||
2079 | ADDR is the address to resume at, or -1 for resume where stopped. | |
2080 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 2081 | or -1 for act according to how it stopped. |
c906108c | 2082 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
2083 | -1 means return after that and print nothing. |
2084 | You should probably set various step_... variables | |
2085 | before calling here, if you are stepping. | |
c906108c SS |
2086 | |
2087 | You should call clear_proceed_status before calling proceed. */ | |
2088 | ||
2089 | void | |
96baa820 | 2090 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c | 2091 | { |
e58b0e63 PA |
2092 | struct regcache *regcache; |
2093 | struct gdbarch *gdbarch; | |
4e1c45ea | 2094 | struct thread_info *tp; |
e58b0e63 | 2095 | CORE_ADDR pc; |
6c95b8df | 2096 | struct address_space *aspace; |
c906108c SS |
2097 | int oneproc = 0; |
2098 | ||
e58b0e63 PA |
2099 | /* If we're stopped at a fork/vfork, follow the branch set by the |
2100 | "set follow-fork-mode" command; otherwise, we'll just proceed | |
2101 | resuming the current thread. */ | |
2102 | if (!follow_fork ()) | |
2103 | { | |
2104 | /* The target for some reason decided not to resume. */ | |
2105 | normal_stop (); | |
f148b27e PA |
2106 | if (target_can_async_p ()) |
2107 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
e58b0e63 PA |
2108 | return; |
2109 | } | |
2110 | ||
842951eb PA |
2111 | /* We'll update this if & when we switch to a new thread. */ |
2112 | previous_inferior_ptid = inferior_ptid; | |
2113 | ||
e58b0e63 PA |
2114 | regcache = get_current_regcache (); |
2115 | gdbarch = get_regcache_arch (regcache); | |
6c95b8df | 2116 | aspace = get_regcache_aspace (regcache); |
e58b0e63 PA |
2117 | pc = regcache_read_pc (regcache); |
2118 | ||
c906108c | 2119 | if (step > 0) |
515630c5 | 2120 | step_start_function = find_pc_function (pc); |
c906108c SS |
2121 | if (step < 0) |
2122 | stop_after_trap = 1; | |
2123 | ||
2acceee2 | 2124 | if (addr == (CORE_ADDR) -1) |
c906108c | 2125 | { |
6c95b8df | 2126 | if (pc == stop_pc && breakpoint_here_p (aspace, pc) |
b2175913 | 2127 | && execution_direction != EXEC_REVERSE) |
3352ef37 AC |
2128 | /* There is a breakpoint at the address we will resume at, |
2129 | step one instruction before inserting breakpoints so that | |
2130 | we do not stop right away (and report a second hit at this | |
b2175913 MS |
2131 | breakpoint). |
2132 | ||
2133 | Note, we don't do this in reverse, because we won't | |
2134 | actually be executing the breakpoint insn anyway. | |
2135 | We'll be (un-)executing the previous instruction. */ | |
2136 | ||
c906108c | 2137 | oneproc = 1; |
515630c5 UW |
2138 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
2139 | && gdbarch_single_step_through_delay (gdbarch, | |
2140 | get_current_frame ())) | |
3352ef37 AC |
2141 | /* We stepped onto an instruction that needs to be stepped |
2142 | again before re-inserting the breakpoint, do so. */ | |
c906108c SS |
2143 | oneproc = 1; |
2144 | } | |
2145 | else | |
2146 | { | |
515630c5 | 2147 | regcache_write_pc (regcache, addr); |
c906108c SS |
2148 | } |
2149 | ||
527159b7 | 2150 | if (debug_infrun) |
8a9de0e4 | 2151 | fprintf_unfiltered (gdb_stdlog, |
5af949e3 UW |
2152 | "infrun: proceed (addr=%s, signal=%d, step=%d)\n", |
2153 | paddress (gdbarch, addr), siggnal, step); | |
527159b7 | 2154 | |
94cc34af PA |
2155 | if (non_stop) |
2156 | /* In non-stop, each thread is handled individually. The context | |
2157 | must already be set to the right thread here. */ | |
2158 | ; | |
2159 | else | |
2160 | { | |
2161 | /* In a multi-threaded task we may select another thread and | |
2162 | then continue or step. | |
c906108c | 2163 | |
94cc34af PA |
2164 | But if the old thread was stopped at a breakpoint, it will |
2165 | immediately cause another breakpoint stop without any | |
2166 | execution (i.e. it will report a breakpoint hit incorrectly). | |
2167 | So we must step over it first. | |
c906108c | 2168 | |
94cc34af PA |
2169 | prepare_to_proceed checks the current thread against the |
2170 | thread that reported the most recent event. If a step-over | |
2171 | is required it returns TRUE and sets the current thread to | |
1777feb0 | 2172 | the old thread. */ |
94cc34af PA |
2173 | if (prepare_to_proceed (step)) |
2174 | oneproc = 1; | |
2175 | } | |
c906108c | 2176 | |
4e1c45ea PA |
2177 | /* prepare_to_proceed may change the current thread. */ |
2178 | tp = inferior_thread (); | |
2179 | ||
30852783 UW |
2180 | if (oneproc) |
2181 | { | |
2182 | tp->control.trap_expected = 1; | |
2183 | /* If displaced stepping is enabled, we can step over the | |
2184 | breakpoint without hitting it, so leave all breakpoints | |
2185 | inserted. Otherwise we need to disable all breakpoints, step | |
2186 | one instruction, and then re-add them when that step is | |
2187 | finished. */ | |
2188 | if (!use_displaced_stepping (gdbarch)) | |
2189 | remove_breakpoints (); | |
2190 | } | |
2191 | ||
2192 | /* We can insert breakpoints if we're not trying to step over one, | |
2193 | or if we are stepping over one but we're using displaced stepping | |
2194 | to do so. */ | |
2195 | if (! tp->control.trap_expected || use_displaced_stepping (gdbarch)) | |
2196 | insert_breakpoints (); | |
2197 | ||
2020b7ab PA |
2198 | if (!non_stop) |
2199 | { | |
2200 | /* Pass the last stop signal to the thread we're resuming, | |
2201 | irrespective of whether the current thread is the thread that | |
2202 | got the last event or not. This was historically GDB's | |
2203 | behaviour before keeping a stop_signal per thread. */ | |
2204 | ||
2205 | struct thread_info *last_thread; | |
2206 | ptid_t last_ptid; | |
2207 | struct target_waitstatus last_status; | |
2208 | ||
2209 | get_last_target_status (&last_ptid, &last_status); | |
2210 | if (!ptid_equal (inferior_ptid, last_ptid) | |
2211 | && !ptid_equal (last_ptid, null_ptid) | |
2212 | && !ptid_equal (last_ptid, minus_one_ptid)) | |
2213 | { | |
e09875d4 | 2214 | last_thread = find_thread_ptid (last_ptid); |
2020b7ab PA |
2215 | if (last_thread) |
2216 | { | |
16c381f0 JK |
2217 | tp->suspend.stop_signal = last_thread->suspend.stop_signal; |
2218 | last_thread->suspend.stop_signal = TARGET_SIGNAL_0; | |
2020b7ab PA |
2219 | } |
2220 | } | |
2221 | } | |
2222 | ||
c906108c | 2223 | if (siggnal != TARGET_SIGNAL_DEFAULT) |
16c381f0 | 2224 | tp->suspend.stop_signal = siggnal; |
c906108c SS |
2225 | /* If this signal should not be seen by program, |
2226 | give it zero. Used for debugging signals. */ | |
16c381f0 JK |
2227 | else if (!signal_program[tp->suspend.stop_signal]) |
2228 | tp->suspend.stop_signal = TARGET_SIGNAL_0; | |
c906108c SS |
2229 | |
2230 | annotate_starting (); | |
2231 | ||
2232 | /* Make sure that output from GDB appears before output from the | |
2233 | inferior. */ | |
2234 | gdb_flush (gdb_stdout); | |
2235 | ||
e4846b08 JJ |
2236 | /* Refresh prev_pc value just prior to resuming. This used to be |
2237 | done in stop_stepping, however, setting prev_pc there did not handle | |
2238 | scenarios such as inferior function calls or returning from | |
2239 | a function via the return command. In those cases, the prev_pc | |
2240 | value was not set properly for subsequent commands. The prev_pc value | |
2241 | is used to initialize the starting line number in the ecs. With an | |
2242 | invalid value, the gdb next command ends up stopping at the position | |
2243 | represented by the next line table entry past our start position. | |
2244 | On platforms that generate one line table entry per line, this | |
2245 | is not a problem. However, on the ia64, the compiler generates | |
2246 | extraneous line table entries that do not increase the line number. | |
2247 | When we issue the gdb next command on the ia64 after an inferior call | |
2248 | or a return command, we often end up a few instructions forward, still | |
2249 | within the original line we started. | |
2250 | ||
d5cd6034 JB |
2251 | An attempt was made to refresh the prev_pc at the same time the |
2252 | execution_control_state is initialized (for instance, just before | |
2253 | waiting for an inferior event). But this approach did not work | |
2254 | because of platforms that use ptrace, where the pc register cannot | |
2255 | be read unless the inferior is stopped. At that point, we are not | |
2256 | guaranteed the inferior is stopped and so the regcache_read_pc() call | |
2257 | can fail. Setting the prev_pc value here ensures the value is updated | |
2258 | correctly when the inferior is stopped. */ | |
4e1c45ea | 2259 | tp->prev_pc = regcache_read_pc (get_current_regcache ()); |
e4846b08 | 2260 | |
59f0d5d9 | 2261 | /* Fill in with reasonable starting values. */ |
4e1c45ea | 2262 | init_thread_stepping_state (tp); |
59f0d5d9 | 2263 | |
59f0d5d9 PA |
2264 | /* Reset to normal state. */ |
2265 | init_infwait_state (); | |
2266 | ||
c906108c | 2267 | /* Resume inferior. */ |
16c381f0 | 2268 | resume (oneproc || step || bpstat_should_step (), tp->suspend.stop_signal); |
c906108c SS |
2269 | |
2270 | /* Wait for it to stop (if not standalone) | |
2271 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 | 2272 | /* Do this only if we are not using the event loop, or if the target |
1777feb0 | 2273 | does not support asynchronous execution. */ |
362646f5 | 2274 | if (!target_can_async_p ()) |
43ff13b4 | 2275 | { |
e4c8541f | 2276 | wait_for_inferior (); |
43ff13b4 JM |
2277 | normal_stop (); |
2278 | } | |
c906108c | 2279 | } |
c906108c SS |
2280 | \f |
2281 | ||
2282 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 2283 | |
c906108c | 2284 | void |
8621d6a9 | 2285 | start_remote (int from_tty) |
c906108c | 2286 | { |
d6b48e9c | 2287 | struct inferior *inferior; |
d6b48e9c PA |
2288 | |
2289 | inferior = current_inferior (); | |
16c381f0 | 2290 | inferior->control.stop_soon = STOP_QUIETLY_REMOTE; |
43ff13b4 | 2291 | |
1777feb0 | 2292 | /* Always go on waiting for the target, regardless of the mode. */ |
6426a772 | 2293 | /* FIXME: cagney/1999-09-23: At present it isn't possible to |
7e73cedf | 2294 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
2295 | nothing is returned (instead of just blocking). Because of this, |
2296 | targets expecting an immediate response need to, internally, set | |
2297 | things up so that the target_wait() is forced to eventually | |
1777feb0 | 2298 | timeout. */ |
6426a772 JM |
2299 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to |
2300 | differentiate to its caller what the state of the target is after | |
2301 | the initial open has been performed. Here we're assuming that | |
2302 | the target has stopped. It should be possible to eventually have | |
2303 | target_open() return to the caller an indication that the target | |
2304 | is currently running and GDB state should be set to the same as | |
1777feb0 | 2305 | for an async run. */ |
e4c8541f | 2306 | wait_for_inferior (); |
8621d6a9 DJ |
2307 | |
2308 | /* Now that the inferior has stopped, do any bookkeeping like | |
2309 | loading shared libraries. We want to do this before normal_stop, | |
2310 | so that the displayed frame is up to date. */ | |
2311 | post_create_inferior (¤t_target, from_tty); | |
2312 | ||
6426a772 | 2313 | normal_stop (); |
c906108c SS |
2314 | } |
2315 | ||
2316 | /* Initialize static vars when a new inferior begins. */ | |
2317 | ||
2318 | void | |
96baa820 | 2319 | init_wait_for_inferior (void) |
c906108c SS |
2320 | { |
2321 | /* These are meaningless until the first time through wait_for_inferior. */ | |
c906108c | 2322 | |
c906108c SS |
2323 | breakpoint_init_inferior (inf_starting); |
2324 | ||
c906108c | 2325 | clear_proceed_status (); |
9f976b41 DJ |
2326 | |
2327 | stepping_past_singlestep_breakpoint = 0; | |
ca67fcb8 | 2328 | deferred_step_ptid = null_ptid; |
ca005067 DJ |
2329 | |
2330 | target_last_wait_ptid = minus_one_ptid; | |
237fc4c9 | 2331 | |
842951eb | 2332 | previous_inferior_ptid = inferior_ptid; |
0d1e5fa7 PA |
2333 | init_infwait_state (); |
2334 | ||
edb3359d DJ |
2335 | /* Discard any skipped inlined frames. */ |
2336 | clear_inline_frame_state (minus_one_ptid); | |
c906108c | 2337 | } |
237fc4c9 | 2338 | |
c906108c | 2339 | \f |
b83266a0 SS |
2340 | /* This enum encodes possible reasons for doing a target_wait, so that |
2341 | wfi can call target_wait in one place. (Ultimately the call will be | |
2342 | moved out of the infinite loop entirely.) */ | |
2343 | ||
c5aa993b JM |
2344 | enum infwait_states |
2345 | { | |
cd0fc7c3 SS |
2346 | infwait_normal_state, |
2347 | infwait_thread_hop_state, | |
d983da9c | 2348 | infwait_step_watch_state, |
cd0fc7c3 | 2349 | infwait_nonstep_watch_state |
b83266a0 SS |
2350 | }; |
2351 | ||
0d1e5fa7 PA |
2352 | /* The PTID we'll do a target_wait on.*/ |
2353 | ptid_t waiton_ptid; | |
2354 | ||
2355 | /* Current inferior wait state. */ | |
2356 | enum infwait_states infwait_state; | |
cd0fc7c3 | 2357 | |
0d1e5fa7 PA |
2358 | /* Data to be passed around while handling an event. This data is |
2359 | discarded between events. */ | |
c5aa993b | 2360 | struct execution_control_state |
488f131b | 2361 | { |
0d1e5fa7 | 2362 | ptid_t ptid; |
4e1c45ea PA |
2363 | /* The thread that got the event, if this was a thread event; NULL |
2364 | otherwise. */ | |
2365 | struct thread_info *event_thread; | |
2366 | ||
488f131b | 2367 | struct target_waitstatus ws; |
488f131b | 2368 | int random_signal; |
7e324e48 | 2369 | int stop_func_filled_in; |
488f131b JB |
2370 | CORE_ADDR stop_func_start; |
2371 | CORE_ADDR stop_func_end; | |
2372 | char *stop_func_name; | |
488f131b | 2373 | int new_thread_event; |
488f131b JB |
2374 | int wait_some_more; |
2375 | }; | |
2376 | ||
ec9499be | 2377 | static void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 2378 | |
568d6575 UW |
2379 | static void handle_step_into_function (struct gdbarch *gdbarch, |
2380 | struct execution_control_state *ecs); | |
2381 | static void handle_step_into_function_backward (struct gdbarch *gdbarch, | |
2382 | struct execution_control_state *ecs); | |
186c406b TT |
2383 | static void check_exception_resume (struct execution_control_state *, |
2384 | struct frame_info *, struct symbol *); | |
611c83ae | 2385 | |
104c1213 JM |
2386 | static void stop_stepping (struct execution_control_state *ecs); |
2387 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 2388 | static void keep_going (struct execution_control_state *ecs); |
104c1213 | 2389 | |
252fbfc8 PA |
2390 | /* Callback for iterate over threads. If the thread is stopped, but |
2391 | the user/frontend doesn't know about that yet, go through | |
2392 | normal_stop, as if the thread had just stopped now. ARG points at | |
2393 | a ptid. If PTID is MINUS_ONE_PTID, applies to all threads. If | |
2394 | ptid_is_pid(PTID) is true, applies to all threads of the process | |
2395 | pointed at by PTID. Otherwise, apply only to the thread pointed by | |
2396 | PTID. */ | |
2397 | ||
2398 | static int | |
2399 | infrun_thread_stop_requested_callback (struct thread_info *info, void *arg) | |
2400 | { | |
2401 | ptid_t ptid = * (ptid_t *) arg; | |
2402 | ||
2403 | if ((ptid_equal (info->ptid, ptid) | |
2404 | || ptid_equal (minus_one_ptid, ptid) | |
2405 | || (ptid_is_pid (ptid) | |
2406 | && ptid_get_pid (ptid) == ptid_get_pid (info->ptid))) | |
2407 | && is_running (info->ptid) | |
2408 | && !is_executing (info->ptid)) | |
2409 | { | |
2410 | struct cleanup *old_chain; | |
2411 | struct execution_control_state ecss; | |
2412 | struct execution_control_state *ecs = &ecss; | |
2413 | ||
2414 | memset (ecs, 0, sizeof (*ecs)); | |
2415 | ||
2416 | old_chain = make_cleanup_restore_current_thread (); | |
2417 | ||
2418 | switch_to_thread (info->ptid); | |
2419 | ||
2420 | /* Go through handle_inferior_event/normal_stop, so we always | |
2421 | have consistent output as if the stop event had been | |
2422 | reported. */ | |
2423 | ecs->ptid = info->ptid; | |
e09875d4 | 2424 | ecs->event_thread = find_thread_ptid (info->ptid); |
252fbfc8 PA |
2425 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; |
2426 | ecs->ws.value.sig = TARGET_SIGNAL_0; | |
2427 | ||
2428 | handle_inferior_event (ecs); | |
2429 | ||
2430 | if (!ecs->wait_some_more) | |
2431 | { | |
2432 | struct thread_info *tp; | |
2433 | ||
2434 | normal_stop (); | |
2435 | ||
fa4cd53f | 2436 | /* Finish off the continuations. */ |
252fbfc8 | 2437 | tp = inferior_thread (); |
fa4cd53f PA |
2438 | do_all_intermediate_continuations_thread (tp, 1); |
2439 | do_all_continuations_thread (tp, 1); | |
252fbfc8 PA |
2440 | } |
2441 | ||
2442 | do_cleanups (old_chain); | |
2443 | } | |
2444 | ||
2445 | return 0; | |
2446 | } | |
2447 | ||
2448 | /* This function is attached as a "thread_stop_requested" observer. | |
2449 | Cleanup local state that assumed the PTID was to be resumed, and | |
2450 | report the stop to the frontend. */ | |
2451 | ||
2c0b251b | 2452 | static void |
252fbfc8 PA |
2453 | infrun_thread_stop_requested (ptid_t ptid) |
2454 | { | |
fc1cf338 | 2455 | struct displaced_step_inferior_state *displaced; |
252fbfc8 PA |
2456 | |
2457 | /* PTID was requested to stop. Remove it from the displaced | |
2458 | stepping queue, so we don't try to resume it automatically. */ | |
fc1cf338 PA |
2459 | |
2460 | for (displaced = displaced_step_inferior_states; | |
2461 | displaced; | |
2462 | displaced = displaced->next) | |
252fbfc8 | 2463 | { |
fc1cf338 | 2464 | struct displaced_step_request *it, **prev_next_p; |
252fbfc8 | 2465 | |
fc1cf338 PA |
2466 | it = displaced->step_request_queue; |
2467 | prev_next_p = &displaced->step_request_queue; | |
2468 | while (it) | |
252fbfc8 | 2469 | { |
fc1cf338 PA |
2470 | if (ptid_match (it->ptid, ptid)) |
2471 | { | |
2472 | *prev_next_p = it->next; | |
2473 | it->next = NULL; | |
2474 | xfree (it); | |
2475 | } | |
252fbfc8 | 2476 | else |
fc1cf338 PA |
2477 | { |
2478 | prev_next_p = &it->next; | |
2479 | } | |
252fbfc8 | 2480 | |
fc1cf338 | 2481 | it = *prev_next_p; |
252fbfc8 | 2482 | } |
252fbfc8 PA |
2483 | } |
2484 | ||
2485 | iterate_over_threads (infrun_thread_stop_requested_callback, &ptid); | |
2486 | } | |
2487 | ||
a07daef3 PA |
2488 | static void |
2489 | infrun_thread_thread_exit (struct thread_info *tp, int silent) | |
2490 | { | |
2491 | if (ptid_equal (target_last_wait_ptid, tp->ptid)) | |
2492 | nullify_last_target_wait_ptid (); | |
2493 | } | |
2494 | ||
4e1c45ea PA |
2495 | /* Callback for iterate_over_threads. */ |
2496 | ||
2497 | static int | |
2498 | delete_step_resume_breakpoint_callback (struct thread_info *info, void *data) | |
2499 | { | |
2500 | if (is_exited (info->ptid)) | |
2501 | return 0; | |
2502 | ||
2503 | delete_step_resume_breakpoint (info); | |
186c406b | 2504 | delete_exception_resume_breakpoint (info); |
4e1c45ea PA |
2505 | return 0; |
2506 | } | |
2507 | ||
2508 | /* In all-stop, delete the step resume breakpoint of any thread that | |
2509 | had one. In non-stop, delete the step resume breakpoint of the | |
2510 | thread that just stopped. */ | |
2511 | ||
2512 | static void | |
2513 | delete_step_thread_step_resume_breakpoint (void) | |
2514 | { | |
2515 | if (!target_has_execution | |
2516 | || ptid_equal (inferior_ptid, null_ptid)) | |
2517 | /* If the inferior has exited, we have already deleted the step | |
2518 | resume breakpoints out of GDB's lists. */ | |
2519 | return; | |
2520 | ||
2521 | if (non_stop) | |
2522 | { | |
2523 | /* If in non-stop mode, only delete the step-resume or | |
2524 | longjmp-resume breakpoint of the thread that just stopped | |
2525 | stepping. */ | |
2526 | struct thread_info *tp = inferior_thread (); | |
abbb1732 | 2527 | |
4e1c45ea | 2528 | delete_step_resume_breakpoint (tp); |
186c406b | 2529 | delete_exception_resume_breakpoint (tp); |
4e1c45ea PA |
2530 | } |
2531 | else | |
2532 | /* In all-stop mode, delete all step-resume and longjmp-resume | |
2533 | breakpoints of any thread that had them. */ | |
2534 | iterate_over_threads (delete_step_resume_breakpoint_callback, NULL); | |
2535 | } | |
2536 | ||
1777feb0 | 2537 | /* A cleanup wrapper. */ |
4e1c45ea PA |
2538 | |
2539 | static void | |
2540 | delete_step_thread_step_resume_breakpoint_cleanup (void *arg) | |
2541 | { | |
2542 | delete_step_thread_step_resume_breakpoint (); | |
2543 | } | |
2544 | ||
223698f8 DE |
2545 | /* Pretty print the results of target_wait, for debugging purposes. */ |
2546 | ||
2547 | static void | |
2548 | print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid, | |
2549 | const struct target_waitstatus *ws) | |
2550 | { | |
2551 | char *status_string = target_waitstatus_to_string (ws); | |
2552 | struct ui_file *tmp_stream = mem_fileopen (); | |
2553 | char *text; | |
223698f8 DE |
2554 | |
2555 | /* The text is split over several lines because it was getting too long. | |
2556 | Call fprintf_unfiltered (gdb_stdlog) once so that the text is still | |
2557 | output as a unit; we want only one timestamp printed if debug_timestamp | |
2558 | is set. */ | |
2559 | ||
2560 | fprintf_unfiltered (tmp_stream, | |
2561 | "infrun: target_wait (%d", PIDGET (waiton_ptid)); | |
2562 | if (PIDGET (waiton_ptid) != -1) | |
2563 | fprintf_unfiltered (tmp_stream, | |
2564 | " [%s]", target_pid_to_str (waiton_ptid)); | |
2565 | fprintf_unfiltered (tmp_stream, ", status) =\n"); | |
2566 | fprintf_unfiltered (tmp_stream, | |
2567 | "infrun: %d [%s],\n", | |
2568 | PIDGET (result_ptid), target_pid_to_str (result_ptid)); | |
2569 | fprintf_unfiltered (tmp_stream, | |
2570 | "infrun: %s\n", | |
2571 | status_string); | |
2572 | ||
759ef836 | 2573 | text = ui_file_xstrdup (tmp_stream, NULL); |
223698f8 DE |
2574 | |
2575 | /* This uses %s in part to handle %'s in the text, but also to avoid | |
2576 | a gcc error: the format attribute requires a string literal. */ | |
2577 | fprintf_unfiltered (gdb_stdlog, "%s", text); | |
2578 | ||
2579 | xfree (status_string); | |
2580 | xfree (text); | |
2581 | ui_file_delete (tmp_stream); | |
2582 | } | |
2583 | ||
24291992 PA |
2584 | /* Prepare and stabilize the inferior for detaching it. E.g., |
2585 | detaching while a thread is displaced stepping is a recipe for | |
2586 | crashing it, as nothing would readjust the PC out of the scratch | |
2587 | pad. */ | |
2588 | ||
2589 | void | |
2590 | prepare_for_detach (void) | |
2591 | { | |
2592 | struct inferior *inf = current_inferior (); | |
2593 | ptid_t pid_ptid = pid_to_ptid (inf->pid); | |
2594 | struct cleanup *old_chain_1; | |
2595 | struct displaced_step_inferior_state *displaced; | |
2596 | ||
2597 | displaced = get_displaced_stepping_state (inf->pid); | |
2598 | ||
2599 | /* Is any thread of this process displaced stepping? If not, | |
2600 | there's nothing else to do. */ | |
2601 | if (displaced == NULL || ptid_equal (displaced->step_ptid, null_ptid)) | |
2602 | return; | |
2603 | ||
2604 | if (debug_infrun) | |
2605 | fprintf_unfiltered (gdb_stdlog, | |
2606 | "displaced-stepping in-process while detaching"); | |
2607 | ||
2608 | old_chain_1 = make_cleanup_restore_integer (&inf->detaching); | |
2609 | inf->detaching = 1; | |
2610 | ||
2611 | while (!ptid_equal (displaced->step_ptid, null_ptid)) | |
2612 | { | |
2613 | struct cleanup *old_chain_2; | |
2614 | struct execution_control_state ecss; | |
2615 | struct execution_control_state *ecs; | |
2616 | ||
2617 | ecs = &ecss; | |
2618 | memset (ecs, 0, sizeof (*ecs)); | |
2619 | ||
2620 | overlay_cache_invalid = 1; | |
2621 | ||
24291992 PA |
2622 | if (deprecated_target_wait_hook) |
2623 | ecs->ptid = deprecated_target_wait_hook (pid_ptid, &ecs->ws, 0); | |
2624 | else | |
2625 | ecs->ptid = target_wait (pid_ptid, &ecs->ws, 0); | |
2626 | ||
2627 | if (debug_infrun) | |
2628 | print_target_wait_results (pid_ptid, ecs->ptid, &ecs->ws); | |
2629 | ||
2630 | /* If an error happens while handling the event, propagate GDB's | |
2631 | knowledge of the executing state to the frontend/user running | |
2632 | state. */ | |
3e43a32a MS |
2633 | old_chain_2 = make_cleanup (finish_thread_state_cleanup, |
2634 | &minus_one_ptid); | |
24291992 | 2635 | |
4d533103 PA |
2636 | /* In non-stop mode, each thread is handled individually. |
2637 | Switch early, so the global state is set correctly for this | |
2638 | thread. */ | |
2639 | if (non_stop | |
2640 | && ecs->ws.kind != TARGET_WAITKIND_EXITED | |
2641 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) | |
2642 | context_switch (ecs->ptid); | |
2643 | ||
24291992 PA |
2644 | /* Now figure out what to do with the result of the result. */ |
2645 | handle_inferior_event (ecs); | |
2646 | ||
2647 | /* No error, don't finish the state yet. */ | |
2648 | discard_cleanups (old_chain_2); | |
2649 | ||
2650 | /* Breakpoints and watchpoints are not installed on the target | |
2651 | at this point, and signals are passed directly to the | |
2652 | inferior, so this must mean the process is gone. */ | |
2653 | if (!ecs->wait_some_more) | |
2654 | { | |
2655 | discard_cleanups (old_chain_1); | |
2656 | error (_("Program exited while detaching")); | |
2657 | } | |
2658 | } | |
2659 | ||
2660 | discard_cleanups (old_chain_1); | |
2661 | } | |
2662 | ||
cd0fc7c3 | 2663 | /* Wait for control to return from inferior to debugger. |
ae123ec6 | 2664 | |
cd0fc7c3 SS |
2665 | If inferior gets a signal, we may decide to start it up again |
2666 | instead of returning. That is why there is a loop in this function. | |
2667 | When this function actually returns it means the inferior | |
2668 | should be left stopped and GDB should read more commands. */ | |
2669 | ||
2670 | void | |
e4c8541f | 2671 | wait_for_inferior (void) |
cd0fc7c3 SS |
2672 | { |
2673 | struct cleanup *old_cleanups; | |
0d1e5fa7 | 2674 | struct execution_control_state ecss; |
cd0fc7c3 | 2675 | struct execution_control_state *ecs; |
c906108c | 2676 | |
527159b7 | 2677 | if (debug_infrun) |
ae123ec6 | 2678 | fprintf_unfiltered |
e4c8541f | 2679 | (gdb_stdlog, "infrun: wait_for_inferior ()\n"); |
527159b7 | 2680 | |
4e1c45ea PA |
2681 | old_cleanups = |
2682 | make_cleanup (delete_step_thread_step_resume_breakpoint_cleanup, NULL); | |
cd0fc7c3 | 2683 | |
cd0fc7c3 | 2684 | ecs = &ecss; |
0d1e5fa7 PA |
2685 | memset (ecs, 0, sizeof (*ecs)); |
2686 | ||
c906108c SS |
2687 | while (1) |
2688 | { | |
29f49a6a PA |
2689 | struct cleanup *old_chain; |
2690 | ||
ec9499be | 2691 | overlay_cache_invalid = 1; |
ec9499be | 2692 | |
9a4105ab | 2693 | if (deprecated_target_wait_hook) |
47608cb1 | 2694 | ecs->ptid = deprecated_target_wait_hook (waiton_ptid, &ecs->ws, 0); |
cd0fc7c3 | 2695 | else |
47608cb1 | 2696 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, 0); |
c906108c | 2697 | |
f00150c9 | 2698 | if (debug_infrun) |
223698f8 | 2699 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 2700 | |
29f49a6a PA |
2701 | /* If an error happens while handling the event, propagate GDB's |
2702 | knowledge of the executing state to the frontend/user running | |
2703 | state. */ | |
2704 | old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2705 | ||
a96d9b2e SDJ |
2706 | if (ecs->ws.kind == TARGET_WAITKIND_SYSCALL_ENTRY |
2707 | || ecs->ws.kind == TARGET_WAITKIND_SYSCALL_RETURN) | |
2708 | ecs->ws.value.syscall_number = UNKNOWN_SYSCALL; | |
2709 | ||
cd0fc7c3 SS |
2710 | /* Now figure out what to do with the result of the result. */ |
2711 | handle_inferior_event (ecs); | |
c906108c | 2712 | |
29f49a6a PA |
2713 | /* No error, don't finish the state yet. */ |
2714 | discard_cleanups (old_chain); | |
2715 | ||
cd0fc7c3 SS |
2716 | if (!ecs->wait_some_more) |
2717 | break; | |
2718 | } | |
4e1c45ea | 2719 | |
cd0fc7c3 SS |
2720 | do_cleanups (old_cleanups); |
2721 | } | |
c906108c | 2722 | |
1777feb0 | 2723 | /* Asynchronous version of wait_for_inferior. It is called by the |
43ff13b4 | 2724 | event loop whenever a change of state is detected on the file |
1777feb0 MS |
2725 | descriptor corresponding to the target. It can be called more than |
2726 | once to complete a single execution command. In such cases we need | |
2727 | to keep the state in a global variable ECSS. If it is the last time | |
a474d7c2 PA |
2728 | that this function is called for a single execution command, then |
2729 | report to the user that the inferior has stopped, and do the | |
1777feb0 | 2730 | necessary cleanups. */ |
43ff13b4 JM |
2731 | |
2732 | void | |
fba45db2 | 2733 | fetch_inferior_event (void *client_data) |
43ff13b4 | 2734 | { |
0d1e5fa7 | 2735 | struct execution_control_state ecss; |
a474d7c2 | 2736 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 | 2737 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
29f49a6a | 2738 | struct cleanup *ts_old_chain; |
4f8d22e3 | 2739 | int was_sync = sync_execution; |
0f641c01 | 2740 | int cmd_done = 0; |
43ff13b4 | 2741 | |
0d1e5fa7 PA |
2742 | memset (ecs, 0, sizeof (*ecs)); |
2743 | ||
c5187ac6 PA |
2744 | /* We're handling a live event, so make sure we're doing live |
2745 | debugging. If we're looking at traceframes while the target is | |
2746 | running, we're going to need to get back to that mode after | |
2747 | handling the event. */ | |
2748 | if (non_stop) | |
2749 | { | |
2750 | make_cleanup_restore_current_traceframe (); | |
e6e4e701 | 2751 | set_current_traceframe (-1); |
c5187ac6 PA |
2752 | } |
2753 | ||
4f8d22e3 PA |
2754 | if (non_stop) |
2755 | /* In non-stop mode, the user/frontend should not notice a thread | |
2756 | switch due to internal events. Make sure we reverse to the | |
2757 | user selected thread and frame after handling the event and | |
2758 | running any breakpoint commands. */ | |
2759 | make_cleanup_restore_current_thread (); | |
2760 | ||
ec9499be | 2761 | overlay_cache_invalid = 1; |
3dd5b83d | 2762 | |
32231432 PA |
2763 | make_cleanup_restore_integer (&execution_direction); |
2764 | execution_direction = target_execution_direction (); | |
2765 | ||
9a4105ab | 2766 | if (deprecated_target_wait_hook) |
a474d7c2 | 2767 | ecs->ptid = |
47608cb1 | 2768 | deprecated_target_wait_hook (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 2769 | else |
47608cb1 | 2770 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws, TARGET_WNOHANG); |
43ff13b4 | 2771 | |
f00150c9 | 2772 | if (debug_infrun) |
223698f8 | 2773 | print_target_wait_results (waiton_ptid, ecs->ptid, &ecs->ws); |
f00150c9 | 2774 | |
94cc34af PA |
2775 | if (non_stop |
2776 | && ecs->ws.kind != TARGET_WAITKIND_IGNORE | |
0e5bf2a8 | 2777 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED |
94cc34af PA |
2778 | && ecs->ws.kind != TARGET_WAITKIND_EXITED |
2779 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) | |
2780 | /* In non-stop mode, each thread is handled individually. Switch | |
2781 | early, so the global state is set correctly for this | |
2782 | thread. */ | |
2783 | context_switch (ecs->ptid); | |
2784 | ||
29f49a6a PA |
2785 | /* If an error happens while handling the event, propagate GDB's |
2786 | knowledge of the executing state to the frontend/user running | |
2787 | state. */ | |
2788 | if (!non_stop) | |
2789 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
2790 | else | |
2791 | ts_old_chain = make_cleanup (finish_thread_state_cleanup, &ecs->ptid); | |
2792 | ||
353d1d73 JK |
2793 | /* Get executed before make_cleanup_restore_current_thread above to apply |
2794 | still for the thread which has thrown the exception. */ | |
2795 | make_bpstat_clear_actions_cleanup (); | |
2796 | ||
43ff13b4 | 2797 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 2798 | handle_inferior_event (ecs); |
43ff13b4 | 2799 | |
a474d7c2 | 2800 | if (!ecs->wait_some_more) |
43ff13b4 | 2801 | { |
d6b48e9c PA |
2802 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); |
2803 | ||
4e1c45ea | 2804 | delete_step_thread_step_resume_breakpoint (); |
f107f563 | 2805 | |
d6b48e9c | 2806 | /* We may not find an inferior if this was a process exit. */ |
16c381f0 | 2807 | if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY) |
83c265ab PA |
2808 | normal_stop (); |
2809 | ||
af679fd0 | 2810 | if (target_has_execution |
0e5bf2a8 | 2811 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED |
af679fd0 PA |
2812 | && ecs->ws.kind != TARGET_WAITKIND_EXITED |
2813 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
2814 | && ecs->event_thread->step_multi | |
16c381f0 | 2815 | && ecs->event_thread->control.stop_step) |
c2d11a7d JM |
2816 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); |
2817 | else | |
0f641c01 PA |
2818 | { |
2819 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
2820 | cmd_done = 1; | |
2821 | } | |
43ff13b4 | 2822 | } |
4f8d22e3 | 2823 | |
29f49a6a PA |
2824 | /* No error, don't finish the thread states yet. */ |
2825 | discard_cleanups (ts_old_chain); | |
2826 | ||
4f8d22e3 PA |
2827 | /* Revert thread and frame. */ |
2828 | do_cleanups (old_chain); | |
2829 | ||
2830 | /* If the inferior was in sync execution mode, and now isn't, | |
0f641c01 PA |
2831 | restore the prompt (a synchronous execution command has finished, |
2832 | and we're ready for input). */ | |
b4a14fd0 | 2833 | if (interpreter_async && was_sync && !sync_execution) |
4f8d22e3 | 2834 | display_gdb_prompt (0); |
0f641c01 PA |
2835 | |
2836 | if (cmd_done | |
2837 | && !was_sync | |
2838 | && exec_done_display_p | |
2839 | && (ptid_equal (inferior_ptid, null_ptid) | |
2840 | || !is_running (inferior_ptid))) | |
2841 | printf_unfiltered (_("completed.\n")); | |
43ff13b4 JM |
2842 | } |
2843 | ||
edb3359d DJ |
2844 | /* Record the frame and location we're currently stepping through. */ |
2845 | void | |
2846 | set_step_info (struct frame_info *frame, struct symtab_and_line sal) | |
2847 | { | |
2848 | struct thread_info *tp = inferior_thread (); | |
2849 | ||
16c381f0 JK |
2850 | tp->control.step_frame_id = get_frame_id (frame); |
2851 | tp->control.step_stack_frame_id = get_stack_frame_id (frame); | |
edb3359d DJ |
2852 | |
2853 | tp->current_symtab = sal.symtab; | |
2854 | tp->current_line = sal.line; | |
2855 | } | |
2856 | ||
0d1e5fa7 PA |
2857 | /* Clear context switchable stepping state. */ |
2858 | ||
2859 | void | |
4e1c45ea | 2860 | init_thread_stepping_state (struct thread_info *tss) |
0d1e5fa7 PA |
2861 | { |
2862 | tss->stepping_over_breakpoint = 0; | |
2863 | tss->step_after_step_resume_breakpoint = 0; | |
cd0fc7c3 SS |
2864 | } |
2865 | ||
e02bc4cc | 2866 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
2867 | target_wait()/deprecated_target_wait_hook(). The data is actually |
2868 | cached by handle_inferior_event(), which gets called immediately | |
2869 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
2870 | |
2871 | void | |
488f131b | 2872 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 2873 | { |
39f77062 | 2874 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
2875 | *status = target_last_waitstatus; |
2876 | } | |
2877 | ||
ac264b3b MS |
2878 | void |
2879 | nullify_last_target_wait_ptid (void) | |
2880 | { | |
2881 | target_last_wait_ptid = minus_one_ptid; | |
2882 | } | |
2883 | ||
dcf4fbde | 2884 | /* Switch thread contexts. */ |
dd80620e MS |
2885 | |
2886 | static void | |
0d1e5fa7 | 2887 | context_switch (ptid_t ptid) |
dd80620e | 2888 | { |
4b51d87b | 2889 | if (debug_infrun && !ptid_equal (ptid, inferior_ptid)) |
fd48f117 DJ |
2890 | { |
2891 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
2892 | target_pid_to_str (inferior_ptid)); | |
2893 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 2894 | target_pid_to_str (ptid)); |
fd48f117 DJ |
2895 | } |
2896 | ||
0d1e5fa7 | 2897 | switch_to_thread (ptid); |
dd80620e MS |
2898 | } |
2899 | ||
4fa8626c DJ |
2900 | static void |
2901 | adjust_pc_after_break (struct execution_control_state *ecs) | |
2902 | { | |
24a73cce UW |
2903 | struct regcache *regcache; |
2904 | struct gdbarch *gdbarch; | |
6c95b8df | 2905 | struct address_space *aspace; |
8aad930b | 2906 | CORE_ADDR breakpoint_pc; |
4fa8626c | 2907 | |
4fa8626c DJ |
2908 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If |
2909 | we aren't, just return. | |
9709f61c DJ |
2910 | |
2911 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
2912 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
2913 | implemented by software breakpoints should be handled through the normal | |
2914 | breakpoint layer. | |
8fb3e588 | 2915 | |
4fa8626c DJ |
2916 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
2917 | different signals (SIGILL or SIGEMT for instance), but it is less | |
2918 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
2919 | gdbarch_decr_pc_after_break. I don't know any specific target that |
2920 | generates these signals at breakpoints (the code has been in GDB since at | |
2921 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 2922 | |
e6cf7916 UW |
2923 | In earlier versions of GDB, a target with |
2924 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
2925 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
2926 | target with both of these set in GDB history, and it seems unlikely to be | |
2927 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c DJ |
2928 | |
2929 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
2930 | return; | |
2931 | ||
2932 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
2933 | return; | |
2934 | ||
4058b839 PA |
2935 | /* In reverse execution, when a breakpoint is hit, the instruction |
2936 | under it has already been de-executed. The reported PC always | |
2937 | points at the breakpoint address, so adjusting it further would | |
2938 | be wrong. E.g., consider this case on a decr_pc_after_break == 1 | |
2939 | architecture: | |
2940 | ||
2941 | B1 0x08000000 : INSN1 | |
2942 | B2 0x08000001 : INSN2 | |
2943 | 0x08000002 : INSN3 | |
2944 | PC -> 0x08000003 : INSN4 | |
2945 | ||
2946 | Say you're stopped at 0x08000003 as above. Reverse continuing | |
2947 | from that point should hit B2 as below. Reading the PC when the | |
2948 | SIGTRAP is reported should read 0x08000001 and INSN2 should have | |
2949 | been de-executed already. | |
2950 | ||
2951 | B1 0x08000000 : INSN1 | |
2952 | B2 PC -> 0x08000001 : INSN2 | |
2953 | 0x08000002 : INSN3 | |
2954 | 0x08000003 : INSN4 | |
2955 | ||
2956 | We can't apply the same logic as for forward execution, because | |
2957 | we would wrongly adjust the PC to 0x08000000, since there's a | |
2958 | breakpoint at PC - 1. We'd then report a hit on B1, although | |
2959 | INSN1 hadn't been de-executed yet. Doing nothing is the correct | |
2960 | behaviour. */ | |
2961 | if (execution_direction == EXEC_REVERSE) | |
2962 | return; | |
2963 | ||
24a73cce UW |
2964 | /* If this target does not decrement the PC after breakpoints, then |
2965 | we have nothing to do. */ | |
2966 | regcache = get_thread_regcache (ecs->ptid); | |
2967 | gdbarch = get_regcache_arch (regcache); | |
2968 | if (gdbarch_decr_pc_after_break (gdbarch) == 0) | |
2969 | return; | |
2970 | ||
6c95b8df PA |
2971 | aspace = get_regcache_aspace (regcache); |
2972 | ||
8aad930b AC |
2973 | /* Find the location where (if we've hit a breakpoint) the |
2974 | breakpoint would be. */ | |
515630c5 UW |
2975 | breakpoint_pc = regcache_read_pc (regcache) |
2976 | - gdbarch_decr_pc_after_break (gdbarch); | |
8aad930b | 2977 | |
1c5cfe86 PA |
2978 | /* Check whether there actually is a software breakpoint inserted at |
2979 | that location. | |
2980 | ||
2981 | If in non-stop mode, a race condition is possible where we've | |
2982 | removed a breakpoint, but stop events for that breakpoint were | |
2983 | already queued and arrive later. To suppress those spurious | |
2984 | SIGTRAPs, we keep a list of such breakpoint locations for a bit, | |
2985 | and retire them after a number of stop events are reported. */ | |
6c95b8df PA |
2986 | if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc) |
2987 | || (non_stop && moribund_breakpoint_here_p (aspace, breakpoint_pc))) | |
8aad930b | 2988 | { |
96429cc8 | 2989 | struct cleanup *old_cleanups = NULL; |
abbb1732 | 2990 | |
96429cc8 HZ |
2991 | if (RECORD_IS_USED) |
2992 | old_cleanups = record_gdb_operation_disable_set (); | |
2993 | ||
1c0fdd0e UW |
2994 | /* When using hardware single-step, a SIGTRAP is reported for both |
2995 | a completed single-step and a software breakpoint. Need to | |
2996 | differentiate between the two, as the latter needs adjusting | |
2997 | but the former does not. | |
2998 | ||
2999 | The SIGTRAP can be due to a completed hardware single-step only if | |
3000 | - we didn't insert software single-step breakpoints | |
3001 | - the thread to be examined is still the current thread | |
3002 | - this thread is currently being stepped | |
3003 | ||
3004 | If any of these events did not occur, we must have stopped due | |
3005 | to hitting a software breakpoint, and have to back up to the | |
3006 | breakpoint address. | |
3007 | ||
3008 | As a special case, we could have hardware single-stepped a | |
3009 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
3010 | we also need to back up to the breakpoint address. */ | |
3011 | ||
3012 | if (singlestep_breakpoints_inserted_p | |
3013 | || !ptid_equal (ecs->ptid, inferior_ptid) | |
4e1c45ea PA |
3014 | || !currently_stepping (ecs->event_thread) |
3015 | || ecs->event_thread->prev_pc == breakpoint_pc) | |
515630c5 | 3016 | regcache_write_pc (regcache, breakpoint_pc); |
96429cc8 HZ |
3017 | |
3018 | if (RECORD_IS_USED) | |
3019 | do_cleanups (old_cleanups); | |
8aad930b | 3020 | } |
4fa8626c DJ |
3021 | } |
3022 | ||
0d1e5fa7 PA |
3023 | void |
3024 | init_infwait_state (void) | |
3025 | { | |
3026 | waiton_ptid = pid_to_ptid (-1); | |
3027 | infwait_state = infwait_normal_state; | |
3028 | } | |
3029 | ||
94cc34af PA |
3030 | void |
3031 | error_is_running (void) | |
3032 | { | |
3e43a32a MS |
3033 | error (_("Cannot execute this command while " |
3034 | "the selected thread is running.")); | |
94cc34af PA |
3035 | } |
3036 | ||
3037 | void | |
3038 | ensure_not_running (void) | |
3039 | { | |
3040 | if (is_running (inferior_ptid)) | |
3041 | error_is_running (); | |
3042 | } | |
3043 | ||
edb3359d DJ |
3044 | static int |
3045 | stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id) | |
3046 | { | |
3047 | for (frame = get_prev_frame (frame); | |
3048 | frame != NULL; | |
3049 | frame = get_prev_frame (frame)) | |
3050 | { | |
3051 | if (frame_id_eq (get_frame_id (frame), step_frame_id)) | |
3052 | return 1; | |
3053 | if (get_frame_type (frame) != INLINE_FRAME) | |
3054 | break; | |
3055 | } | |
3056 | ||
3057 | return 0; | |
3058 | } | |
3059 | ||
a96d9b2e SDJ |
3060 | /* Auxiliary function that handles syscall entry/return events. |
3061 | It returns 1 if the inferior should keep going (and GDB | |
3062 | should ignore the event), or 0 if the event deserves to be | |
3063 | processed. */ | |
ca2163eb | 3064 | |
a96d9b2e | 3065 | static int |
ca2163eb | 3066 | handle_syscall_event (struct execution_control_state *ecs) |
a96d9b2e | 3067 | { |
ca2163eb PA |
3068 | struct regcache *regcache; |
3069 | struct gdbarch *gdbarch; | |
3070 | int syscall_number; | |
3071 | ||
3072 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3073 | context_switch (ecs->ptid); | |
3074 | ||
3075 | regcache = get_thread_regcache (ecs->ptid); | |
3076 | gdbarch = get_regcache_arch (regcache); | |
3077 | syscall_number = gdbarch_get_syscall_number (gdbarch, ecs->ptid); | |
3078 | stop_pc = regcache_read_pc (regcache); | |
3079 | ||
a96d9b2e SDJ |
3080 | target_last_waitstatus.value.syscall_number = syscall_number; |
3081 | ||
3082 | if (catch_syscall_enabled () > 0 | |
3083 | && catching_syscall_number (syscall_number) > 0) | |
3084 | { | |
3085 | if (debug_infrun) | |
3086 | fprintf_unfiltered (gdb_stdlog, "infrun: syscall number = '%d'\n", | |
3087 | syscall_number); | |
a96d9b2e | 3088 | |
16c381f0 | 3089 | ecs->event_thread->control.stop_bpstat |
6c95b8df PA |
3090 | = bpstat_stop_status (get_regcache_aspace (regcache), |
3091 | stop_pc, ecs->ptid); | |
16c381f0 JK |
3092 | ecs->random_signal |
3093 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat); | |
a96d9b2e | 3094 | |
ca2163eb PA |
3095 | if (!ecs->random_signal) |
3096 | { | |
3097 | /* Catchpoint hit. */ | |
16c381f0 | 3098 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_TRAP; |
ca2163eb PA |
3099 | return 0; |
3100 | } | |
a96d9b2e | 3101 | } |
ca2163eb PA |
3102 | |
3103 | /* If no catchpoint triggered for this, then keep going. */ | |
16c381f0 | 3104 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; |
ca2163eb PA |
3105 | keep_going (ecs); |
3106 | return 1; | |
a96d9b2e SDJ |
3107 | } |
3108 | ||
7e324e48 GB |
3109 | /* Clear the supplied execution_control_state's stop_func_* fields. */ |
3110 | ||
3111 | static void | |
3112 | clear_stop_func (struct execution_control_state *ecs) | |
3113 | { | |
3114 | ecs->stop_func_filled_in = 0; | |
3115 | ecs->stop_func_start = 0; | |
3116 | ecs->stop_func_end = 0; | |
3117 | ecs->stop_func_name = NULL; | |
3118 | } | |
3119 | ||
3120 | /* Lazily fill in the execution_control_state's stop_func_* fields. */ | |
3121 | ||
3122 | static void | |
3123 | fill_in_stop_func (struct gdbarch *gdbarch, | |
3124 | struct execution_control_state *ecs) | |
3125 | { | |
3126 | if (!ecs->stop_func_filled_in) | |
3127 | { | |
3128 | /* Don't care about return value; stop_func_start and stop_func_name | |
3129 | will both be 0 if it doesn't work. */ | |
3130 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
3131 | &ecs->stop_func_start, &ecs->stop_func_end); | |
3132 | ecs->stop_func_start | |
3133 | += gdbarch_deprecated_function_start_offset (gdbarch); | |
3134 | ||
3135 | ecs->stop_func_filled_in = 1; | |
3136 | } | |
3137 | } | |
3138 | ||
cd0fc7c3 SS |
3139 | /* Given an execution control state that has been freshly filled in |
3140 | by an event from the inferior, figure out what it means and take | |
3141 | appropriate action. */ | |
c906108c | 3142 | |
ec9499be | 3143 | static void |
96baa820 | 3144 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 3145 | { |
568d6575 UW |
3146 | struct frame_info *frame; |
3147 | struct gdbarch *gdbarch; | |
d983da9c DJ |
3148 | int stopped_by_watchpoint; |
3149 | int stepped_after_stopped_by_watchpoint = 0; | |
2afb61aa | 3150 | struct symtab_and_line stop_pc_sal; |
d6b48e9c PA |
3151 | enum stop_kind stop_soon; |
3152 | ||
28736962 PA |
3153 | if (ecs->ws.kind == TARGET_WAITKIND_IGNORE) |
3154 | { | |
3155 | /* We had an event in the inferior, but we are not interested in | |
3156 | handling it at this level. The lower layers have already | |
3157 | done what needs to be done, if anything. | |
3158 | ||
3159 | One of the possible circumstances for this is when the | |
3160 | inferior produces output for the console. The inferior has | |
3161 | not stopped, and we are ignoring the event. Another possible | |
3162 | circumstance is any event which the lower level knows will be | |
3163 | reported multiple times without an intervening resume. */ | |
3164 | if (debug_infrun) | |
3165 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); | |
3166 | prepare_to_wait (ecs); | |
3167 | return; | |
3168 | } | |
3169 | ||
0e5bf2a8 PA |
3170 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED |
3171 | && target_can_async_p () && !sync_execution) | |
3172 | { | |
3173 | /* There were no unwaited-for children left in the target, but, | |
3174 | we're not synchronously waiting for events either. Just | |
3175 | ignore. Otherwise, if we were running a synchronous | |
3176 | execution command, we need to cancel it and give the user | |
3177 | back the terminal. */ | |
3178 | if (debug_infrun) | |
3179 | fprintf_unfiltered (gdb_stdlog, | |
3180 | "infrun: TARGET_WAITKIND_NO_RESUMED (ignoring)\n"); | |
3181 | prepare_to_wait (ecs); | |
3182 | return; | |
3183 | } | |
3184 | ||
d6b48e9c | 3185 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
0e5bf2a8 PA |
3186 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED |
3187 | && ecs->ws.kind != TARGET_WAITKIND_NO_RESUMED) | |
d6b48e9c PA |
3188 | { |
3189 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); | |
abbb1732 | 3190 | |
d6b48e9c | 3191 | gdb_assert (inf); |
16c381f0 | 3192 | stop_soon = inf->control.stop_soon; |
d6b48e9c PA |
3193 | } |
3194 | else | |
3195 | stop_soon = NO_STOP_QUIETLY; | |
cd0fc7c3 | 3196 | |
1777feb0 | 3197 | /* Cache the last pid/waitstatus. */ |
39f77062 | 3198 | target_last_wait_ptid = ecs->ptid; |
0d1e5fa7 | 3199 | target_last_waitstatus = ecs->ws; |
e02bc4cc | 3200 | |
ca005067 | 3201 | /* Always clear state belonging to the previous time we stopped. */ |
aa7d318d | 3202 | stop_stack_dummy = STOP_NONE; |
ca005067 | 3203 | |
0e5bf2a8 PA |
3204 | if (ecs->ws.kind == TARGET_WAITKIND_NO_RESUMED) |
3205 | { | |
3206 | /* No unwaited-for children left. IOW, all resumed children | |
3207 | have exited. */ | |
3208 | if (debug_infrun) | |
3209 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_RESUMED\n"); | |
3210 | ||
3211 | stop_print_frame = 0; | |
3212 | stop_stepping (ecs); | |
3213 | return; | |
3214 | } | |
3215 | ||
1777feb0 | 3216 | /* If it's a new process, add it to the thread database. */ |
8c90c137 LM |
3217 | |
3218 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) | |
3219 | && !ptid_equal (ecs->ptid, minus_one_ptid) | |
3220 | && !in_thread_list (ecs->ptid)); | |
3221 | ||
3222 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
3223 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
3224 | add_thread (ecs->ptid); | |
3225 | ||
e09875d4 | 3226 | ecs->event_thread = find_thread_ptid (ecs->ptid); |
88ed393a JK |
3227 | |
3228 | /* Dependent on valid ECS->EVENT_THREAD. */ | |
3229 | adjust_pc_after_break (ecs); | |
3230 | ||
3231 | /* Dependent on the current PC value modified by adjust_pc_after_break. */ | |
3232 | reinit_frame_cache (); | |
3233 | ||
28736962 PA |
3234 | breakpoint_retire_moribund (); |
3235 | ||
2b009048 DJ |
3236 | /* First, distinguish signals caused by the debugger from signals |
3237 | that have to do with the program's own actions. Note that | |
3238 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
3239 | on the operating system version. Here we detect when a SIGILL or | |
3240 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
3241 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
3242 | when we're trying to execute a breakpoint instruction on a | |
3243 | non-executable stack. This happens for call dummy breakpoints | |
3244 | for architectures like SPARC that place call dummies on the | |
3245 | stack. */ | |
2b009048 DJ |
3246 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED |
3247 | && (ecs->ws.value.sig == TARGET_SIGNAL_ILL | |
3248 | || ecs->ws.value.sig == TARGET_SIGNAL_SEGV | |
de0a0249 | 3249 | || ecs->ws.value.sig == TARGET_SIGNAL_EMT)) |
2b009048 | 3250 | { |
de0a0249 UW |
3251 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
3252 | ||
3253 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), | |
3254 | regcache_read_pc (regcache))) | |
3255 | { | |
3256 | if (debug_infrun) | |
3257 | fprintf_unfiltered (gdb_stdlog, | |
3258 | "infrun: Treating signal as SIGTRAP\n"); | |
3259 | ecs->ws.value.sig = TARGET_SIGNAL_TRAP; | |
3260 | } | |
2b009048 DJ |
3261 | } |
3262 | ||
28736962 PA |
3263 | /* Mark the non-executing threads accordingly. In all-stop, all |
3264 | threads of all processes are stopped when we get any event | |
3265 | reported. In non-stop mode, only the event thread stops. If | |
3266 | we're handling a process exit in non-stop mode, there's nothing | |
3267 | to do, as threads of the dead process are gone, and threads of | |
3268 | any other process were left running. */ | |
3269 | if (!non_stop) | |
3270 | set_executing (minus_one_ptid, 0); | |
3271 | else if (ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
3272 | && ecs->ws.kind != TARGET_WAITKIND_EXITED) | |
7aee8dc2 | 3273 | set_executing (ecs->ptid, 0); |
8c90c137 | 3274 | |
0d1e5fa7 | 3275 | switch (infwait_state) |
488f131b JB |
3276 | { |
3277 | case infwait_thread_hop_state: | |
527159b7 | 3278 | if (debug_infrun) |
8a9de0e4 | 3279 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); |
65e82032 | 3280 | break; |
b83266a0 | 3281 | |
488f131b | 3282 | case infwait_normal_state: |
527159b7 | 3283 | if (debug_infrun) |
8a9de0e4 | 3284 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
d983da9c DJ |
3285 | break; |
3286 | ||
3287 | case infwait_step_watch_state: | |
3288 | if (debug_infrun) | |
3289 | fprintf_unfiltered (gdb_stdlog, | |
3290 | "infrun: infwait_step_watch_state\n"); | |
3291 | ||
3292 | stepped_after_stopped_by_watchpoint = 1; | |
488f131b | 3293 | break; |
b83266a0 | 3294 | |
488f131b | 3295 | case infwait_nonstep_watch_state: |
527159b7 | 3296 | if (debug_infrun) |
8a9de0e4 AC |
3297 | fprintf_unfiltered (gdb_stdlog, |
3298 | "infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 3299 | insert_breakpoints (); |
c906108c | 3300 | |
488f131b JB |
3301 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
3302 | handle things like signals arriving and other things happening | |
3303 | in combination correctly? */ | |
3304 | stepped_after_stopped_by_watchpoint = 1; | |
3305 | break; | |
65e82032 AC |
3306 | |
3307 | default: | |
e2e0b3e5 | 3308 | internal_error (__FILE__, __LINE__, _("bad switch")); |
488f131b | 3309 | } |
ec9499be | 3310 | |
0d1e5fa7 | 3311 | infwait_state = infwait_normal_state; |
ec9499be | 3312 | waiton_ptid = pid_to_ptid (-1); |
c906108c | 3313 | |
488f131b JB |
3314 | switch (ecs->ws.kind) |
3315 | { | |
3316 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 3317 | if (debug_infrun) |
8a9de0e4 | 3318 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
b0f4b84b DJ |
3319 | /* Ignore gracefully during startup of the inferior, as it might |
3320 | be the shell which has just loaded some objects, otherwise | |
3321 | add the symbols for the newly loaded objects. Also ignore at | |
3322 | the beginning of an attach or remote session; we will query | |
3323 | the full list of libraries once the connection is | |
3324 | established. */ | |
c0236d92 | 3325 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 3326 | { |
488f131b JB |
3327 | /* Check for any newly added shared libraries if we're |
3328 | supposed to be adding them automatically. Switch | |
3329 | terminal for any messages produced by | |
3330 | breakpoint_re_set. */ | |
3331 | target_terminal_ours_for_output (); | |
aff6338a | 3332 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
3333 | stack's section table is kept up-to-date. Architectures, |
3334 | (e.g., PPC64), use the section table to perform | |
3335 | operations such as address => section name and hence | |
3336 | require the table to contain all sections (including | |
3337 | those found in shared libraries). */ | |
b0f4b84b | 3338 | #ifdef SOLIB_ADD |
aff6338a | 3339 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
b0f4b84b DJ |
3340 | #else |
3341 | solib_add (NULL, 0, ¤t_target, auto_solib_add); | |
3342 | #endif | |
488f131b JB |
3343 | target_terminal_inferior (); |
3344 | ||
b0f4b84b DJ |
3345 | /* If requested, stop when the dynamic linker notifies |
3346 | gdb of events. This allows the user to get control | |
3347 | and place breakpoints in initializer routines for | |
3348 | dynamically loaded objects (among other things). */ | |
3349 | if (stop_on_solib_events) | |
3350 | { | |
55409f9d DJ |
3351 | /* Make sure we print "Stopped due to solib-event" in |
3352 | normal_stop. */ | |
3353 | stop_print_frame = 1; | |
3354 | ||
b0f4b84b DJ |
3355 | stop_stepping (ecs); |
3356 | return; | |
3357 | } | |
3358 | ||
3359 | /* NOTE drow/2007-05-11: This might be a good place to check | |
3360 | for "catch load". */ | |
488f131b | 3361 | } |
b0f4b84b DJ |
3362 | |
3363 | /* If we are skipping through a shell, or through shared library | |
3364 | loading that we aren't interested in, resume the program. If | |
3365 | we're running the program normally, also resume. But stop if | |
3366 | we're attaching or setting up a remote connection. */ | |
3367 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
3368 | { | |
74960c60 VP |
3369 | /* Loading of shared libraries might have changed breakpoint |
3370 | addresses. Make sure new breakpoints are inserted. */ | |
0b02b92d UW |
3371 | if (stop_soon == NO_STOP_QUIETLY |
3372 | && !breakpoints_always_inserted_mode ()) | |
74960c60 | 3373 | insert_breakpoints (); |
b0f4b84b DJ |
3374 | resume (0, TARGET_SIGNAL_0); |
3375 | prepare_to_wait (ecs); | |
3376 | return; | |
3377 | } | |
3378 | ||
3379 | break; | |
c5aa993b | 3380 | |
488f131b | 3381 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 3382 | if (debug_infrun) |
8a9de0e4 | 3383 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
488f131b JB |
3384 | resume (0, TARGET_SIGNAL_0); |
3385 | prepare_to_wait (ecs); | |
3386 | return; | |
c5aa993b | 3387 | |
488f131b | 3388 | case TARGET_WAITKIND_EXITED: |
527159b7 | 3389 | if (debug_infrun) |
8a9de0e4 | 3390 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n"); |
fb66883a | 3391 | inferior_ptid = ecs->ptid; |
6c95b8df PA |
3392 | set_current_inferior (find_inferior_pid (ptid_get_pid (ecs->ptid))); |
3393 | set_current_program_space (current_inferior ()->pspace); | |
3394 | handle_vfork_child_exec_or_exit (0); | |
1777feb0 | 3395 | target_terminal_ours (); /* Must do this before mourn anyway. */ |
33d62d64 | 3396 | print_exited_reason (ecs->ws.value.integer); |
488f131b JB |
3397 | |
3398 | /* Record the exit code in the convenience variable $_exitcode, so | |
3399 | that the user can inspect this again later. */ | |
4fa62494 UW |
3400 | set_internalvar_integer (lookup_internalvar ("_exitcode"), |
3401 | (LONGEST) ecs->ws.value.integer); | |
8cf64490 TT |
3402 | |
3403 | /* Also record this in the inferior itself. */ | |
3404 | current_inferior ()->has_exit_code = 1; | |
3405 | current_inferior ()->exit_code = (LONGEST) ecs->ws.value.integer; | |
3406 | ||
488f131b JB |
3407 | gdb_flush (gdb_stdout); |
3408 | target_mourn_inferior (); | |
1c0fdd0e | 3409 | singlestep_breakpoints_inserted_p = 0; |
d03285ec | 3410 | cancel_single_step_breakpoints (); |
488f131b JB |
3411 | stop_print_frame = 0; |
3412 | stop_stepping (ecs); | |
3413 | return; | |
c5aa993b | 3414 | |
488f131b | 3415 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 3416 | if (debug_infrun) |
8a9de0e4 | 3417 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n"); |
fb66883a | 3418 | inferior_ptid = ecs->ptid; |
6c95b8df PA |
3419 | set_current_inferior (find_inferior_pid (ptid_get_pid (ecs->ptid))); |
3420 | set_current_program_space (current_inferior ()->pspace); | |
3421 | handle_vfork_child_exec_or_exit (0); | |
488f131b | 3422 | stop_print_frame = 0; |
1777feb0 | 3423 | target_terminal_ours (); /* Must do this before mourn anyway. */ |
c5aa993b | 3424 | |
488f131b JB |
3425 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
3426 | reach here unless the inferior is dead. However, for years | |
3427 | target_kill() was called here, which hints that fatal signals aren't | |
3428 | really fatal on some systems. If that's true, then some changes | |
1777feb0 | 3429 | may be needed. */ |
488f131b | 3430 | target_mourn_inferior (); |
c906108c | 3431 | |
33d62d64 | 3432 | print_signal_exited_reason (ecs->ws.value.sig); |
1c0fdd0e | 3433 | singlestep_breakpoints_inserted_p = 0; |
d03285ec | 3434 | cancel_single_step_breakpoints (); |
488f131b JB |
3435 | stop_stepping (ecs); |
3436 | return; | |
c906108c | 3437 | |
488f131b | 3438 | /* The following are the only cases in which we keep going; |
1777feb0 | 3439 | the above cases end in a continue or goto. */ |
488f131b | 3440 | case TARGET_WAITKIND_FORKED: |
deb3b17b | 3441 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 3442 | if (debug_infrun) |
8a9de0e4 | 3443 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); |
c906108c | 3444 | |
e2d96639 YQ |
3445 | /* Check whether the inferior is displaced stepping. */ |
3446 | { | |
3447 | struct regcache *regcache = get_thread_regcache (ecs->ptid); | |
3448 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3449 | struct displaced_step_inferior_state *displaced | |
3450 | = get_displaced_stepping_state (ptid_get_pid (ecs->ptid)); | |
3451 | ||
3452 | /* If checking displaced stepping is supported, and thread | |
3453 | ecs->ptid is displaced stepping. */ | |
3454 | if (displaced && ptid_equal (displaced->step_ptid, ecs->ptid)) | |
3455 | { | |
3456 | struct inferior *parent_inf | |
3457 | = find_inferior_pid (ptid_get_pid (ecs->ptid)); | |
3458 | struct regcache *child_regcache; | |
3459 | CORE_ADDR parent_pc; | |
3460 | ||
3461 | /* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED, | |
3462 | indicating that the displaced stepping of syscall instruction | |
3463 | has been done. Perform cleanup for parent process here. Note | |
3464 | that this operation also cleans up the child process for vfork, | |
3465 | because their pages are shared. */ | |
3466 | displaced_step_fixup (ecs->ptid, TARGET_SIGNAL_TRAP); | |
3467 | ||
3468 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
3469 | { | |
3470 | /* Restore scratch pad for child process. */ | |
3471 | displaced_step_restore (displaced, ecs->ws.value.related_pid); | |
3472 | } | |
3473 | ||
3474 | /* Since the vfork/fork syscall instruction was executed in the scratchpad, | |
3475 | the child's PC is also within the scratchpad. Set the child's PC | |
3476 | to the parent's PC value, which has already been fixed up. | |
3477 | FIXME: we use the parent's aspace here, although we're touching | |
3478 | the child, because the child hasn't been added to the inferior | |
3479 | list yet at this point. */ | |
3480 | ||
3481 | child_regcache | |
3482 | = get_thread_arch_aspace_regcache (ecs->ws.value.related_pid, | |
3483 | gdbarch, | |
3484 | parent_inf->aspace); | |
3485 | /* Read PC value of parent process. */ | |
3486 | parent_pc = regcache_read_pc (regcache); | |
3487 | ||
3488 | if (debug_displaced) | |
3489 | fprintf_unfiltered (gdb_stdlog, | |
3490 | "displaced: write child pc from %s to %s\n", | |
3491 | paddress (gdbarch, | |
3492 | regcache_read_pc (child_regcache)), | |
3493 | paddress (gdbarch, parent_pc)); | |
3494 | ||
3495 | regcache_write_pc (child_regcache, parent_pc); | |
3496 | } | |
3497 | } | |
3498 | ||
5a2901d9 DJ |
3499 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3500 | { | |
0d1e5fa7 | 3501 | context_switch (ecs->ptid); |
35f196d9 | 3502 | reinit_frame_cache (); |
5a2901d9 DJ |
3503 | } |
3504 | ||
b242c3c2 PA |
3505 | /* Immediately detach breakpoints from the child before there's |
3506 | any chance of letting the user delete breakpoints from the | |
3507 | breakpoint lists. If we don't do this early, it's easy to | |
3508 | leave left over traps in the child, vis: "break foo; catch | |
3509 | fork; c; <fork>; del; c; <child calls foo>". We only follow | |
3510 | the fork on the last `continue', and by that time the | |
3511 | breakpoint at "foo" is long gone from the breakpoint table. | |
3512 | If we vforked, then we don't need to unpatch here, since both | |
3513 | parent and child are sharing the same memory pages; we'll | |
3514 | need to unpatch at follow/detach time instead to be certain | |
3515 | that new breakpoints added between catchpoint hit time and | |
3516 | vfork follow are detached. */ | |
3517 | if (ecs->ws.kind != TARGET_WAITKIND_VFORKED) | |
3518 | { | |
3519 | int child_pid = ptid_get_pid (ecs->ws.value.related_pid); | |
3520 | ||
3521 | /* This won't actually modify the breakpoint list, but will | |
3522 | physically remove the breakpoints from the child. */ | |
3523 | detach_breakpoints (child_pid); | |
3524 | } | |
3525 | ||
d03285ec UW |
3526 | if (singlestep_breakpoints_inserted_p) |
3527 | { | |
1777feb0 | 3528 | /* Pull the single step breakpoints out of the target. */ |
d03285ec UW |
3529 | remove_single_step_breakpoints (); |
3530 | singlestep_breakpoints_inserted_p = 0; | |
3531 | } | |
3532 | ||
e58b0e63 PA |
3533 | /* In case the event is caught by a catchpoint, remember that |
3534 | the event is to be followed at the next resume of the thread, | |
3535 | and not immediately. */ | |
3536 | ecs->event_thread->pending_follow = ecs->ws; | |
3537 | ||
fb14de7b | 3538 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 3539 | |
16c381f0 | 3540 | ecs->event_thread->control.stop_bpstat |
6c95b8df PA |
3541 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
3542 | stop_pc, ecs->ptid); | |
675bf4cb | 3543 | |
67822962 PA |
3544 | /* Note that we're interested in knowing the bpstat actually |
3545 | causes a stop, not just if it may explain the signal. | |
3546 | Software watchpoints, for example, always appear in the | |
3547 | bpstat. */ | |
16c381f0 JK |
3548 | ecs->random_signal |
3549 | = !bpstat_causes_stop (ecs->event_thread->control.stop_bpstat); | |
04e68871 DJ |
3550 | |
3551 | /* If no catchpoint triggered for this, then keep going. */ | |
3552 | if (ecs->random_signal) | |
3553 | { | |
6c95b8df PA |
3554 | ptid_t parent; |
3555 | ptid_t child; | |
e58b0e63 | 3556 | int should_resume; |
3e43a32a MS |
3557 | int follow_child |
3558 | = (follow_fork_mode_string == follow_fork_mode_child); | |
e58b0e63 | 3559 | |
16c381f0 | 3560 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; |
e58b0e63 PA |
3561 | |
3562 | should_resume = follow_fork (); | |
3563 | ||
6c95b8df PA |
3564 | parent = ecs->ptid; |
3565 | child = ecs->ws.value.related_pid; | |
3566 | ||
3567 | /* In non-stop mode, also resume the other branch. */ | |
3568 | if (non_stop && !detach_fork) | |
3569 | { | |
3570 | if (follow_child) | |
3571 | switch_to_thread (parent); | |
3572 | else | |
3573 | switch_to_thread (child); | |
3574 | ||
3575 | ecs->event_thread = inferior_thread (); | |
3576 | ecs->ptid = inferior_ptid; | |
3577 | keep_going (ecs); | |
3578 | } | |
3579 | ||
3580 | if (follow_child) | |
3581 | switch_to_thread (child); | |
3582 | else | |
3583 | switch_to_thread (parent); | |
3584 | ||
e58b0e63 PA |
3585 | ecs->event_thread = inferior_thread (); |
3586 | ecs->ptid = inferior_ptid; | |
3587 | ||
3588 | if (should_resume) | |
3589 | keep_going (ecs); | |
3590 | else | |
3591 | stop_stepping (ecs); | |
04e68871 DJ |
3592 | return; |
3593 | } | |
16c381f0 | 3594 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_TRAP; |
488f131b JB |
3595 | goto process_event_stop_test; |
3596 | ||
6c95b8df PA |
3597 | case TARGET_WAITKIND_VFORK_DONE: |
3598 | /* Done with the shared memory region. Re-insert breakpoints in | |
3599 | the parent, and keep going. */ | |
3600 | ||
3601 | if (debug_infrun) | |
3e43a32a MS |
3602 | fprintf_unfiltered (gdb_stdlog, |
3603 | "infrun: TARGET_WAITKIND_VFORK_DONE\n"); | |
6c95b8df PA |
3604 | |
3605 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
3606 | context_switch (ecs->ptid); | |
3607 | ||
3608 | current_inferior ()->waiting_for_vfork_done = 0; | |
56710373 | 3609 | current_inferior ()->pspace->breakpoints_not_allowed = 0; |
6c95b8df PA |
3610 | /* This also takes care of reinserting breakpoints in the |
3611 | previously locked inferior. */ | |
3612 | keep_going (ecs); | |
3613 | return; | |
3614 | ||
488f131b | 3615 | case TARGET_WAITKIND_EXECD: |
527159b7 | 3616 | if (debug_infrun) |
fc5261f2 | 3617 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b | 3618 | |
5a2901d9 DJ |
3619 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3620 | { | |
0d1e5fa7 | 3621 | context_switch (ecs->ptid); |
35f196d9 | 3622 | reinit_frame_cache (); |
5a2901d9 DJ |
3623 | } |
3624 | ||
d03285ec UW |
3625 | singlestep_breakpoints_inserted_p = 0; |
3626 | cancel_single_step_breakpoints (); | |
3627 | ||
fb14de7b | 3628 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
795e548f | 3629 | |
6c95b8df PA |
3630 | /* Do whatever is necessary to the parent branch of the vfork. */ |
3631 | handle_vfork_child_exec_or_exit (1); | |
3632 | ||
795e548f PA |
3633 | /* This causes the eventpoints and symbol table to be reset. |
3634 | Must do this now, before trying to determine whether to | |
3635 | stop. */ | |
71b43ef8 | 3636 | follow_exec (inferior_ptid, ecs->ws.value.execd_pathname); |
795e548f | 3637 | |
16c381f0 | 3638 | ecs->event_thread->control.stop_bpstat |
6c95b8df PA |
3639 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
3640 | stop_pc, ecs->ptid); | |
16c381f0 JK |
3641 | ecs->random_signal |
3642 | = !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat); | |
795e548f | 3643 | |
71b43ef8 PA |
3644 | /* Note that this may be referenced from inside |
3645 | bpstat_stop_status above, through inferior_has_execd. */ | |
3646 | xfree (ecs->ws.value.execd_pathname); | |
3647 | ecs->ws.value.execd_pathname = NULL; | |
3648 | ||
04e68871 DJ |
3649 | /* If no catchpoint triggered for this, then keep going. */ |
3650 | if (ecs->random_signal) | |
3651 | { | |
16c381f0 | 3652 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; |
04e68871 DJ |
3653 | keep_going (ecs); |
3654 | return; | |
3655 | } | |
16c381f0 | 3656 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_TRAP; |
488f131b JB |
3657 | goto process_event_stop_test; |
3658 | ||
b4dc5ffa MK |
3659 | /* Be careful not to try to gather much state about a thread |
3660 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 3661 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 3662 | if (debug_infrun) |
3e43a32a MS |
3663 | fprintf_unfiltered (gdb_stdlog, |
3664 | "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); | |
1777feb0 | 3665 | /* Getting the current syscall number. */ |
ca2163eb | 3666 | if (handle_syscall_event (ecs) != 0) |
a96d9b2e SDJ |
3667 | return; |
3668 | goto process_event_stop_test; | |
c906108c | 3669 | |
488f131b JB |
3670 | /* Before examining the threads further, step this thread to |
3671 | get it entirely out of the syscall. (We get notice of the | |
3672 | event when the thread is just on the verge of exiting a | |
3673 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 3674 | into user code.) */ |
488f131b | 3675 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 3676 | if (debug_infrun) |
3e43a32a MS |
3677 | fprintf_unfiltered (gdb_stdlog, |
3678 | "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); | |
ca2163eb | 3679 | if (handle_syscall_event (ecs) != 0) |
a96d9b2e SDJ |
3680 | return; |
3681 | goto process_event_stop_test; | |
c906108c | 3682 | |
488f131b | 3683 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 3684 | if (debug_infrun) |
8a9de0e4 | 3685 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
16c381f0 | 3686 | ecs->event_thread->suspend.stop_signal = ecs->ws.value.sig; |
488f131b | 3687 | break; |
c906108c | 3688 | |
b2175913 | 3689 | case TARGET_WAITKIND_NO_HISTORY: |
4b4e080e PA |
3690 | if (debug_infrun) |
3691 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_NO_HISTORY\n"); | |
b2175913 | 3692 | /* Reverse execution: target ran out of history info. */ |
fb14de7b | 3693 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
33d62d64 | 3694 | print_no_history_reason (); |
b2175913 MS |
3695 | stop_stepping (ecs); |
3696 | return; | |
488f131b | 3697 | } |
c906108c | 3698 | |
488f131b JB |
3699 | if (ecs->new_thread_event) |
3700 | { | |
94cc34af PA |
3701 | if (non_stop) |
3702 | /* Non-stop assumes that the target handles adding new threads | |
3703 | to the thread list. */ | |
3e43a32a MS |
3704 | internal_error (__FILE__, __LINE__, |
3705 | "targets should add new threads to the thread " | |
3706 | "list themselves in non-stop mode."); | |
94cc34af PA |
3707 | |
3708 | /* We may want to consider not doing a resume here in order to | |
3709 | give the user a chance to play with the new thread. It might | |
3710 | be good to make that a user-settable option. */ | |
3711 | ||
3712 | /* At this point, all threads are stopped (happens automatically | |
3713 | in either the OS or the native code). Therefore we need to | |
3714 | continue all threads in order to make progress. */ | |
3715 | ||
173853dc PA |
3716 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
3717 | context_switch (ecs->ptid); | |
488f131b JB |
3718 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); |
3719 | prepare_to_wait (ecs); | |
3720 | return; | |
3721 | } | |
c906108c | 3722 | |
2020b7ab | 3723 | if (ecs->ws.kind == TARGET_WAITKIND_STOPPED) |
252fbfc8 PA |
3724 | { |
3725 | /* Do we need to clean up the state of a thread that has | |
3726 | completed a displaced single-step? (Doing so usually affects | |
3727 | the PC, so do it here, before we set stop_pc.) */ | |
16c381f0 JK |
3728 | displaced_step_fixup (ecs->ptid, |
3729 | ecs->event_thread->suspend.stop_signal); | |
252fbfc8 PA |
3730 | |
3731 | /* If we either finished a single-step or hit a breakpoint, but | |
3732 | the user wanted this thread to be stopped, pretend we got a | |
3733 | SIG0 (generic unsignaled stop). */ | |
3734 | ||
3735 | if (ecs->event_thread->stop_requested | |
16c381f0 JK |
3736 | && ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP) |
3737 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; | |
252fbfc8 | 3738 | } |
237fc4c9 | 3739 | |
515630c5 | 3740 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 3741 | |
527159b7 | 3742 | if (debug_infrun) |
237fc4c9 | 3743 | { |
5af949e3 UW |
3744 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
3745 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
7f82dfc7 JK |
3746 | struct cleanup *old_chain = save_inferior_ptid (); |
3747 | ||
3748 | inferior_ptid = ecs->ptid; | |
5af949e3 UW |
3749 | |
3750 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = %s\n", | |
3751 | paddress (gdbarch, stop_pc)); | |
d92524f1 | 3752 | if (target_stopped_by_watchpoint ()) |
237fc4c9 PA |
3753 | { |
3754 | CORE_ADDR addr; | |
abbb1732 | 3755 | |
237fc4c9 PA |
3756 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); |
3757 | ||
3758 | if (target_stopped_data_address (¤t_target, &addr)) | |
3759 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
3760 | "infrun: stopped data address = %s\n", |
3761 | paddress (gdbarch, addr)); | |
237fc4c9 PA |
3762 | else |
3763 | fprintf_unfiltered (gdb_stdlog, | |
3764 | "infrun: (no data address available)\n"); | |
3765 | } | |
7f82dfc7 JK |
3766 | |
3767 | do_cleanups (old_chain); | |
237fc4c9 | 3768 | } |
527159b7 | 3769 | |
9f976b41 DJ |
3770 | if (stepping_past_singlestep_breakpoint) |
3771 | { | |
1c0fdd0e | 3772 | gdb_assert (singlestep_breakpoints_inserted_p); |
9f976b41 DJ |
3773 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
3774 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
3775 | ||
3776 | stepping_past_singlestep_breakpoint = 0; | |
3777 | ||
3778 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
3779 | breakpoint, or stopped for some other reason. It would be nice if |
3780 | we could tell, but we can't reliably. */ | |
16c381f0 | 3781 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP) |
8fb3e588 | 3782 | { |
527159b7 | 3783 | if (debug_infrun) |
3e43a32a MS |
3784 | fprintf_unfiltered (gdb_stdlog, |
3785 | "infrun: stepping_past_" | |
3786 | "singlestep_breakpoint\n"); | |
9f976b41 | 3787 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 3788 | remove_single_step_breakpoints (); |
9f976b41 DJ |
3789 | singlestep_breakpoints_inserted_p = 0; |
3790 | ||
3791 | ecs->random_signal = 0; | |
16c381f0 | 3792 | ecs->event_thread->control.trap_expected = 0; |
9f976b41 | 3793 | |
0d1e5fa7 | 3794 | context_switch (saved_singlestep_ptid); |
9a4105ab AC |
3795 | if (deprecated_context_hook) |
3796 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
3797 | |
3798 | resume (1, TARGET_SIGNAL_0); | |
3799 | prepare_to_wait (ecs); | |
3800 | return; | |
3801 | } | |
3802 | } | |
3803 | ||
ca67fcb8 | 3804 | if (!ptid_equal (deferred_step_ptid, null_ptid)) |
6a6b96b9 | 3805 | { |
94cc34af PA |
3806 | /* In non-stop mode, there's never a deferred_step_ptid set. */ |
3807 | gdb_assert (!non_stop); | |
3808 | ||
6a6b96b9 UW |
3809 | /* If we stopped for some other reason than single-stepping, ignore |
3810 | the fact that we were supposed to switch back. */ | |
16c381f0 | 3811 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP) |
6a6b96b9 UW |
3812 | { |
3813 | if (debug_infrun) | |
3814 | fprintf_unfiltered (gdb_stdlog, | |
ca67fcb8 | 3815 | "infrun: handling deferred step\n"); |
6a6b96b9 UW |
3816 | |
3817 | /* Pull the single step breakpoints out of the target. */ | |
3818 | if (singlestep_breakpoints_inserted_p) | |
3819 | { | |
3820 | remove_single_step_breakpoints (); | |
3821 | singlestep_breakpoints_inserted_p = 0; | |
3822 | } | |
3823 | ||
cd3da28e PA |
3824 | ecs->event_thread->control.trap_expected = 0; |
3825 | ||
6a6b96b9 UW |
3826 | /* Note: We do not call context_switch at this point, as the |
3827 | context is already set up for stepping the original thread. */ | |
ca67fcb8 VP |
3828 | switch_to_thread (deferred_step_ptid); |
3829 | deferred_step_ptid = null_ptid; | |
6a6b96b9 UW |
3830 | /* Suppress spurious "Switching to ..." message. */ |
3831 | previous_inferior_ptid = inferior_ptid; | |
3832 | ||
3833 | resume (1, TARGET_SIGNAL_0); | |
3834 | prepare_to_wait (ecs); | |
3835 | return; | |
3836 | } | |
ca67fcb8 VP |
3837 | |
3838 | deferred_step_ptid = null_ptid; | |
6a6b96b9 UW |
3839 | } |
3840 | ||
488f131b JB |
3841 | /* See if a thread hit a thread-specific breakpoint that was meant for |
3842 | another thread. If so, then step that thread past the breakpoint, | |
3843 | and continue it. */ | |
3844 | ||
16c381f0 | 3845 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP) |
488f131b | 3846 | { |
9f976b41 | 3847 | int thread_hop_needed = 0; |
cf00dfa7 VP |
3848 | struct address_space *aspace = |
3849 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
9f976b41 | 3850 | |
f8d40ec8 | 3851 | /* Check if a regular breakpoint has been hit before checking |
1777feb0 | 3852 | for a potential single step breakpoint. Otherwise, GDB will |
f8d40ec8 | 3853 | not see this breakpoint hit when stepping onto breakpoints. */ |
6c95b8df | 3854 | if (regular_breakpoint_inserted_here_p (aspace, stop_pc)) |
488f131b | 3855 | { |
c5aa993b | 3856 | ecs->random_signal = 0; |
6c95b8df | 3857 | if (!breakpoint_thread_match (aspace, stop_pc, ecs->ptid)) |
9f976b41 DJ |
3858 | thread_hop_needed = 1; |
3859 | } | |
1c0fdd0e | 3860 | else if (singlestep_breakpoints_inserted_p) |
9f976b41 | 3861 | { |
fd48f117 DJ |
3862 | /* We have not context switched yet, so this should be true |
3863 | no matter which thread hit the singlestep breakpoint. */ | |
3864 | gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid)); | |
3865 | if (debug_infrun) | |
3866 | fprintf_unfiltered (gdb_stdlog, "infrun: software single step " | |
3867 | "trap for %s\n", | |
3868 | target_pid_to_str (ecs->ptid)); | |
3869 | ||
9f976b41 DJ |
3870 | ecs->random_signal = 0; |
3871 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
3872 | change when we go from single-threaded to multi-threaded. If | |
3873 | the singlestep_ptid is still in the list, assume that it is | |
3874 | really different from ecs->ptid. */ | |
3875 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
3876 | && in_thread_list (singlestep_ptid)) | |
3877 | { | |
fd48f117 DJ |
3878 | /* If the PC of the thread we were trying to single-step |
3879 | has changed, discard this event (which we were going | |
3880 | to ignore anyway), and pretend we saw that thread | |
3881 | trap. This prevents us continuously moving the | |
3882 | single-step breakpoint forward, one instruction at a | |
3883 | time. If the PC has changed, then the thread we were | |
3884 | trying to single-step has trapped or been signalled, | |
3885 | but the event has not been reported to GDB yet. | |
3886 | ||
3887 | There might be some cases where this loses signal | |
3888 | information, if a signal has arrived at exactly the | |
3889 | same time that the PC changed, but this is the best | |
3890 | we can do with the information available. Perhaps we | |
3891 | should arrange to report all events for all threads | |
3892 | when they stop, or to re-poll the remote looking for | |
3893 | this particular thread (i.e. temporarily enable | |
3894 | schedlock). */ | |
515630c5 UW |
3895 | |
3896 | CORE_ADDR new_singlestep_pc | |
3897 | = regcache_read_pc (get_thread_regcache (singlestep_ptid)); | |
3898 | ||
3899 | if (new_singlestep_pc != singlestep_pc) | |
fd48f117 | 3900 | { |
2020b7ab PA |
3901 | enum target_signal stop_signal; |
3902 | ||
fd48f117 DJ |
3903 | if (debug_infrun) |
3904 | fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread," | |
3905 | " but expected thread advanced also\n"); | |
3906 | ||
3907 | /* The current context still belongs to | |
3908 | singlestep_ptid. Don't swap here, since that's | |
3909 | the context we want to use. Just fudge our | |
3910 | state and continue. */ | |
16c381f0 JK |
3911 | stop_signal = ecs->event_thread->suspend.stop_signal; |
3912 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; | |
fd48f117 | 3913 | ecs->ptid = singlestep_ptid; |
e09875d4 | 3914 | ecs->event_thread = find_thread_ptid (ecs->ptid); |
16c381f0 | 3915 | ecs->event_thread->suspend.stop_signal = stop_signal; |
515630c5 | 3916 | stop_pc = new_singlestep_pc; |
fd48f117 DJ |
3917 | } |
3918 | else | |
3919 | { | |
3920 | if (debug_infrun) | |
3921 | fprintf_unfiltered (gdb_stdlog, | |
3922 | "infrun: unexpected thread\n"); | |
3923 | ||
3924 | thread_hop_needed = 1; | |
3925 | stepping_past_singlestep_breakpoint = 1; | |
3926 | saved_singlestep_ptid = singlestep_ptid; | |
3927 | } | |
9f976b41 DJ |
3928 | } |
3929 | } | |
3930 | ||
3931 | if (thread_hop_needed) | |
8fb3e588 | 3932 | { |
9f5a595d | 3933 | struct regcache *thread_regcache; |
237fc4c9 | 3934 | int remove_status = 0; |
8fb3e588 | 3935 | |
527159b7 | 3936 | if (debug_infrun) |
8a9de0e4 | 3937 | fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); |
527159b7 | 3938 | |
b3444185 PA |
3939 | /* Switch context before touching inferior memory, the |
3940 | previous thread may have exited. */ | |
3941 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
3942 | context_switch (ecs->ptid); | |
3943 | ||
8fb3e588 | 3944 | /* Saw a breakpoint, but it was hit by the wrong thread. |
1777feb0 | 3945 | Just continue. */ |
8fb3e588 | 3946 | |
1c0fdd0e | 3947 | if (singlestep_breakpoints_inserted_p) |
488f131b | 3948 | { |
1777feb0 | 3949 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 3950 | remove_single_step_breakpoints (); |
8fb3e588 AC |
3951 | singlestep_breakpoints_inserted_p = 0; |
3952 | } | |
3953 | ||
237fc4c9 PA |
3954 | /* If the arch can displace step, don't remove the |
3955 | breakpoints. */ | |
9f5a595d UW |
3956 | thread_regcache = get_thread_regcache (ecs->ptid); |
3957 | if (!use_displaced_stepping (get_regcache_arch (thread_regcache))) | |
237fc4c9 PA |
3958 | remove_status = remove_breakpoints (); |
3959 | ||
8fb3e588 AC |
3960 | /* Did we fail to remove breakpoints? If so, try |
3961 | to set the PC past the bp. (There's at least | |
3962 | one situation in which we can fail to remove | |
3963 | the bp's: On HP-UX's that use ttrace, we can't | |
3964 | change the address space of a vforking child | |
3965 | process until the child exits (well, okay, not | |
1777feb0 | 3966 | then either :-) or execs. */ |
8fb3e588 | 3967 | if (remove_status != 0) |
9d9cd7ac | 3968 | error (_("Cannot step over breakpoint hit in wrong thread")); |
8fb3e588 AC |
3969 | else |
3970 | { /* Single step */ | |
94cc34af PA |
3971 | if (!non_stop) |
3972 | { | |
3973 | /* Only need to require the next event from this | |
3974 | thread in all-stop mode. */ | |
3975 | waiton_ptid = ecs->ptid; | |
3976 | infwait_state = infwait_thread_hop_state; | |
3977 | } | |
8fb3e588 | 3978 | |
4e1c45ea | 3979 | ecs->event_thread->stepping_over_breakpoint = 1; |
8fb3e588 | 3980 | keep_going (ecs); |
8fb3e588 AC |
3981 | return; |
3982 | } | |
488f131b | 3983 | } |
1c0fdd0e | 3984 | else if (singlestep_breakpoints_inserted_p) |
8fb3e588 | 3985 | { |
8fb3e588 AC |
3986 | ecs->random_signal = 0; |
3987 | } | |
488f131b JB |
3988 | } |
3989 | else | |
3990 | ecs->random_signal = 1; | |
c906108c | 3991 | |
488f131b | 3992 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
3993 | so, then switch to that thread. */ |
3994 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 3995 | { |
527159b7 | 3996 | if (debug_infrun) |
8a9de0e4 | 3997 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 3998 | |
0d1e5fa7 | 3999 | context_switch (ecs->ptid); |
c5aa993b | 4000 | |
9a4105ab AC |
4001 | if (deprecated_context_hook) |
4002 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 4003 | } |
c906108c | 4004 | |
568d6575 UW |
4005 | /* At this point, get hold of the now-current thread's frame. */ |
4006 | frame = get_current_frame (); | |
4007 | gdbarch = get_frame_arch (frame); | |
4008 | ||
1c0fdd0e | 4009 | if (singlestep_breakpoints_inserted_p) |
488f131b | 4010 | { |
1777feb0 | 4011 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 4012 | remove_single_step_breakpoints (); |
488f131b JB |
4013 | singlestep_breakpoints_inserted_p = 0; |
4014 | } | |
c906108c | 4015 | |
d983da9c DJ |
4016 | if (stepped_after_stopped_by_watchpoint) |
4017 | stopped_by_watchpoint = 0; | |
4018 | else | |
4019 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
4020 | ||
4021 | /* If necessary, step over this watchpoint. We'll be back to display | |
4022 | it in a moment. */ | |
4023 | if (stopped_by_watchpoint | |
d92524f1 | 4024 | && (target_have_steppable_watchpoint |
568d6575 | 4025 | || gdbarch_have_nonsteppable_watchpoint (gdbarch))) |
488f131b | 4026 | { |
488f131b JB |
4027 | /* At this point, we are stopped at an instruction which has |
4028 | attempted to write to a piece of memory under control of | |
4029 | a watchpoint. The instruction hasn't actually executed | |
4030 | yet. If we were to evaluate the watchpoint expression | |
4031 | now, we would get the old value, and therefore no change | |
4032 | would seem to have occurred. | |
4033 | ||
4034 | In order to make watchpoints work `right', we really need | |
4035 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
4036 | watchpoint expression. We do this by single-stepping the |
4037 | target. | |
4038 | ||
4039 | It may not be necessary to disable the watchpoint to stop over | |
4040 | it. For example, the PA can (with some kernel cooperation) | |
4041 | single step over a watchpoint without disabling the watchpoint. | |
4042 | ||
4043 | It is far more common to need to disable a watchpoint to step | |
4044 | the inferior over it. If we have non-steppable watchpoints, | |
4045 | we must disable the current watchpoint; it's simplest to | |
4046 | disable all watchpoints and breakpoints. */ | |
2facfe5c DD |
4047 | int hw_step = 1; |
4048 | ||
d92524f1 | 4049 | if (!target_have_steppable_watchpoint) |
2455069d UW |
4050 | { |
4051 | remove_breakpoints (); | |
4052 | /* See comment in resume why we need to stop bypassing signals | |
4053 | while breakpoints have been removed. */ | |
4054 | target_pass_signals (0, NULL); | |
4055 | } | |
2facfe5c | 4056 | /* Single step */ |
568d6575 | 4057 | hw_step = maybe_software_singlestep (gdbarch, stop_pc); |
2facfe5c | 4058 | target_resume (ecs->ptid, hw_step, TARGET_SIGNAL_0); |
0d1e5fa7 | 4059 | waiton_ptid = ecs->ptid; |
d92524f1 | 4060 | if (target_have_steppable_watchpoint) |
0d1e5fa7 | 4061 | infwait_state = infwait_step_watch_state; |
d983da9c | 4062 | else |
0d1e5fa7 | 4063 | infwait_state = infwait_nonstep_watch_state; |
488f131b JB |
4064 | prepare_to_wait (ecs); |
4065 | return; | |
4066 | } | |
4067 | ||
7e324e48 | 4068 | clear_stop_func (ecs); |
4e1c45ea | 4069 | ecs->event_thread->stepping_over_breakpoint = 0; |
16c381f0 JK |
4070 | bpstat_clear (&ecs->event_thread->control.stop_bpstat); |
4071 | ecs->event_thread->control.stop_step = 0; | |
488f131b JB |
4072 | stop_print_frame = 1; |
4073 | ecs->random_signal = 0; | |
4074 | stopped_by_random_signal = 0; | |
488f131b | 4075 | |
edb3359d DJ |
4076 | /* Hide inlined functions starting here, unless we just performed stepi or |
4077 | nexti. After stepi and nexti, always show the innermost frame (not any | |
4078 | inline function call sites). */ | |
16c381f0 | 4079 | if (ecs->event_thread->control.step_range_end != 1) |
0574c78f GB |
4080 | { |
4081 | struct address_space *aspace = | |
4082 | get_regcache_aspace (get_thread_regcache (ecs->ptid)); | |
4083 | ||
4084 | /* skip_inline_frames is expensive, so we avoid it if we can | |
4085 | determine that the address is one where functions cannot have | |
4086 | been inlined. This improves performance with inferiors that | |
4087 | load a lot of shared libraries, because the solib event | |
4088 | breakpoint is defined as the address of a function (i.e. not | |
4089 | inline). Note that we have to check the previous PC as well | |
4090 | as the current one to catch cases when we have just | |
4091 | single-stepped off a breakpoint prior to reinstating it. | |
4092 | Note that we're assuming that the code we single-step to is | |
4093 | not inline, but that's not definitive: there's nothing | |
4094 | preventing the event breakpoint function from containing | |
4095 | inlined code, and the single-step ending up there. If the | |
4096 | user had set a breakpoint on that inlined code, the missing | |
4097 | skip_inline_frames call would break things. Fortunately | |
4098 | that's an extremely unlikely scenario. */ | |
4099 | if (!pc_at_non_inline_function (aspace, stop_pc) | |
4100 | && !(ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP | |
4101 | && ecs->event_thread->control.trap_expected | |
4102 | && pc_at_non_inline_function (aspace, | |
4103 | ecs->event_thread->prev_pc))) | |
4104 | skip_inline_frames (ecs->ptid); | |
4105 | } | |
edb3359d | 4106 | |
16c381f0 JK |
4107 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP |
4108 | && ecs->event_thread->control.trap_expected | |
568d6575 | 4109 | && gdbarch_single_step_through_delay_p (gdbarch) |
4e1c45ea | 4110 | && currently_stepping (ecs->event_thread)) |
3352ef37 | 4111 | { |
b50d7442 | 4112 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 | 4113 | also on an instruction that needs to be stepped multiple |
1777feb0 | 4114 | times before it's been fully executing. E.g., architectures |
3352ef37 AC |
4115 | with a delay slot. It needs to be stepped twice, once for |
4116 | the instruction and once for the delay slot. */ | |
4117 | int step_through_delay | |
568d6575 | 4118 | = gdbarch_single_step_through_delay (gdbarch, frame); |
abbb1732 | 4119 | |
527159b7 | 4120 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 4121 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
16c381f0 JK |
4122 | if (ecs->event_thread->control.step_range_end == 0 |
4123 | && step_through_delay) | |
3352ef37 AC |
4124 | { |
4125 | /* The user issued a continue when stopped at a breakpoint. | |
4126 | Set up for another trap and get out of here. */ | |
4e1c45ea | 4127 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
4128 | keep_going (ecs); |
4129 | return; | |
4130 | } | |
4131 | else if (step_through_delay) | |
4132 | { | |
4133 | /* The user issued a step when stopped at a breakpoint. | |
4134 | Maybe we should stop, maybe we should not - the delay | |
4135 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
4136 | case, don't decide that here, just set |
4137 | ecs->stepping_over_breakpoint, making sure we | |
4138 | single-step again before breakpoints are re-inserted. */ | |
4e1c45ea | 4139 | ecs->event_thread->stepping_over_breakpoint = 1; |
3352ef37 AC |
4140 | } |
4141 | } | |
4142 | ||
488f131b JB |
4143 | /* Look at the cause of the stop, and decide what to do. |
4144 | The alternatives are: | |
0d1e5fa7 PA |
4145 | 1) stop_stepping and return; to really stop and return to the debugger, |
4146 | 2) keep_going and return to start up again | |
4e1c45ea | 4147 | (set ecs->event_thread->stepping_over_breakpoint to 1 to single step once) |
488f131b JB |
4148 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 |
4149 | will be made according to the signal handling tables. */ | |
4150 | ||
16c381f0 | 4151 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP |
b0f4b84b DJ |
4152 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP |
4153 | || stop_soon == STOP_QUIETLY_REMOTE) | |
488f131b | 4154 | { |
16c381f0 JK |
4155 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP |
4156 | && stop_after_trap) | |
488f131b | 4157 | { |
527159b7 | 4158 | if (debug_infrun) |
8a9de0e4 | 4159 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); |
488f131b JB |
4160 | stop_print_frame = 0; |
4161 | stop_stepping (ecs); | |
4162 | return; | |
4163 | } | |
c54cfec8 EZ |
4164 | |
4165 | /* This is originated from start_remote(), start_inferior() and | |
4166 | shared libraries hook functions. */ | |
b0f4b84b | 4167 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
488f131b | 4168 | { |
527159b7 | 4169 | if (debug_infrun) |
8a9de0e4 | 4170 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); |
488f131b JB |
4171 | stop_stepping (ecs); |
4172 | return; | |
4173 | } | |
4174 | ||
c54cfec8 | 4175 | /* This originates from attach_command(). We need to overwrite |
a0d21d28 PA |
4176 | the stop_signal here, because some kernels don't ignore a |
4177 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
4178 | See more comments in inferior.h. On the other hand, if we | |
a0ef4274 | 4179 | get a non-SIGSTOP, report it to the user - assume the backend |
a0d21d28 PA |
4180 | will handle the SIGSTOP if it should show up later. |
4181 | ||
4182 | Also consider that the attach is complete when we see a | |
4183 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
4184 | target extended-remote report it instead of a SIGSTOP | |
4185 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
e0ba6746 PA |
4186 | signal, so this is no exception. |
4187 | ||
4188 | Also consider that the attach is complete when we see a | |
4189 | TARGET_SIGNAL_0. In non-stop mode, GDB will explicitly tell | |
4190 | the target to stop all threads of the inferior, in case the | |
4191 | low level attach operation doesn't stop them implicitly. If | |
4192 | they weren't stopped implicitly, then the stub will report a | |
4193 | TARGET_SIGNAL_0, meaning: stopped for no particular reason | |
4194 | other than GDB's request. */ | |
a0ef4274 | 4195 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP |
16c381f0 JK |
4196 | && (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_STOP |
4197 | || ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP | |
4198 | || ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_0)) | |
c54cfec8 EZ |
4199 | { |
4200 | stop_stepping (ecs); | |
16c381f0 | 4201 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; |
c54cfec8 EZ |
4202 | return; |
4203 | } | |
4204 | ||
fba57f8f | 4205 | /* See if there is a breakpoint at the current PC. */ |
16c381f0 | 4206 | ecs->event_thread->control.stop_bpstat |
6c95b8df PA |
4207 | = bpstat_stop_status (get_regcache_aspace (get_current_regcache ()), |
4208 | stop_pc, ecs->ptid); | |
4209 | ||
fba57f8f VP |
4210 | /* Following in case break condition called a |
4211 | function. */ | |
4212 | stop_print_frame = 1; | |
488f131b | 4213 | |
db82e815 PA |
4214 | /* This is where we handle "moribund" watchpoints. Unlike |
4215 | software breakpoints traps, hardware watchpoint traps are | |
4216 | always distinguishable from random traps. If no high-level | |
4217 | watchpoint is associated with the reported stop data address | |
4218 | anymore, then the bpstat does not explain the signal --- | |
4219 | simply make sure to ignore it if `stopped_by_watchpoint' is | |
4220 | set. */ | |
4221 | ||
4222 | if (debug_infrun | |
16c381f0 JK |
4223 | && ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP |
4224 | && !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat) | |
db82e815 | 4225 | && stopped_by_watchpoint) |
3e43a32a MS |
4226 | fprintf_unfiltered (gdb_stdlog, |
4227 | "infrun: no user watchpoint explains " | |
4228 | "watchpoint SIGTRAP, ignoring\n"); | |
db82e815 | 4229 | |
73dd234f | 4230 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
4231 | at one stage in the past included checks for an inferior |
4232 | function call's call dummy's return breakpoint. The original | |
4233 | comment, that went with the test, read: | |
73dd234f | 4234 | |
8fb3e588 AC |
4235 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
4236 | another signal besides SIGTRAP, so check here as well as | |
4237 | above.'' | |
73dd234f | 4238 | |
8002d778 | 4239 | If someone ever tries to get call dummys on a |
73dd234f | 4240 | non-executable stack to work (where the target would stop |
03cebad2 MK |
4241 | with something like a SIGSEGV), then those tests might need |
4242 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 4243 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
4244 | suspect that it won't be the case. |
4245 | ||
8fb3e588 AC |
4246 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
4247 | be necessary for call dummies on a non-executable stack on | |
4248 | SPARC. */ | |
73dd234f | 4249 | |
16c381f0 | 4250 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP) |
488f131b | 4251 | ecs->random_signal |
16c381f0 | 4252 | = !(bpstat_explains_signal (ecs->event_thread->control.stop_bpstat) |
db82e815 | 4253 | || stopped_by_watchpoint |
16c381f0 JK |
4254 | || ecs->event_thread->control.trap_expected |
4255 | || (ecs->event_thread->control.step_range_end | |
8358c15c JK |
4256 | && (ecs->event_thread->control.step_resume_breakpoint |
4257 | == NULL))); | |
488f131b JB |
4258 | else |
4259 | { | |
16c381f0 JK |
4260 | ecs->random_signal = !bpstat_explains_signal |
4261 | (ecs->event_thread->control.stop_bpstat); | |
488f131b | 4262 | if (!ecs->random_signal) |
16c381f0 | 4263 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_TRAP; |
488f131b JB |
4264 | } |
4265 | } | |
4266 | ||
4267 | /* When we reach this point, we've pretty much decided | |
4268 | that the reason for stopping must've been a random | |
1777feb0 | 4269 | (unexpected) signal. */ |
488f131b JB |
4270 | |
4271 | else | |
4272 | ecs->random_signal = 1; | |
488f131b | 4273 | |
04e68871 | 4274 | process_event_stop_test: |
568d6575 UW |
4275 | |
4276 | /* Re-fetch current thread's frame in case we did a | |
4277 | "goto process_event_stop_test" above. */ | |
4278 | frame = get_current_frame (); | |
4279 | gdbarch = get_frame_arch (frame); | |
4280 | ||
488f131b JB |
4281 | /* For the program's own signals, act according to |
4282 | the signal handling tables. */ | |
4283 | ||
4284 | if (ecs->random_signal) | |
4285 | { | |
4286 | /* Signal not for debugging purposes. */ | |
4287 | int printed = 0; | |
24291992 | 4288 | struct inferior *inf = find_inferior_pid (ptid_get_pid (ecs->ptid)); |
488f131b | 4289 | |
527159b7 | 4290 | if (debug_infrun) |
2020b7ab | 4291 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", |
16c381f0 | 4292 | ecs->event_thread->suspend.stop_signal); |
527159b7 | 4293 | |
488f131b JB |
4294 | stopped_by_random_signal = 1; |
4295 | ||
16c381f0 | 4296 | if (signal_print[ecs->event_thread->suspend.stop_signal]) |
488f131b JB |
4297 | { |
4298 | printed = 1; | |
4299 | target_terminal_ours_for_output (); | |
16c381f0 JK |
4300 | print_signal_received_reason |
4301 | (ecs->event_thread->suspend.stop_signal); | |
488f131b | 4302 | } |
252fbfc8 PA |
4303 | /* Always stop on signals if we're either just gaining control |
4304 | of the program, or the user explicitly requested this thread | |
4305 | to remain stopped. */ | |
d6b48e9c | 4306 | if (stop_soon != NO_STOP_QUIETLY |
252fbfc8 | 4307 | || ecs->event_thread->stop_requested |
24291992 | 4308 | || (!inf->detaching |
16c381f0 | 4309 | && signal_stop_state (ecs->event_thread->suspend.stop_signal))) |
488f131b JB |
4310 | { |
4311 | stop_stepping (ecs); | |
4312 | return; | |
4313 | } | |
4314 | /* If not going to stop, give terminal back | |
4315 | if we took it away. */ | |
4316 | else if (printed) | |
4317 | target_terminal_inferior (); | |
4318 | ||
4319 | /* Clear the signal if it should not be passed. */ | |
16c381f0 JK |
4320 | if (signal_program[ecs->event_thread->suspend.stop_signal] == 0) |
4321 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; | |
488f131b | 4322 | |
fb14de7b | 4323 | if (ecs->event_thread->prev_pc == stop_pc |
16c381f0 | 4324 | && ecs->event_thread->control.trap_expected |
8358c15c | 4325 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
68f53502 AC |
4326 | { |
4327 | /* We were just starting a new sequence, attempting to | |
4328 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 4329 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
4330 | of the stepping range so GDB needs to remember to, when |
4331 | the signal handler returns, resume stepping off that | |
4332 | breakpoint. */ | |
4333 | /* To simplify things, "continue" is forced to use the same | |
4334 | code paths as single-step - set a breakpoint at the | |
4335 | signal return address and then, once hit, step off that | |
4336 | breakpoint. */ | |
237fc4c9 PA |
4337 | if (debug_infrun) |
4338 | fprintf_unfiltered (gdb_stdlog, | |
4339 | "infrun: signal arrived while stepping over " | |
4340 | "breakpoint\n"); | |
d3169d93 | 4341 | |
2c03e5be | 4342 | insert_hp_step_resume_breakpoint_at_frame (frame); |
4e1c45ea | 4343 | ecs->event_thread->step_after_step_resume_breakpoint = 1; |
2455069d UW |
4344 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
4345 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
4346 | keep_going (ecs); |
4347 | return; | |
68f53502 | 4348 | } |
9d799f85 | 4349 | |
16c381f0 JK |
4350 | if (ecs->event_thread->control.step_range_end != 0 |
4351 | && ecs->event_thread->suspend.stop_signal != TARGET_SIGNAL_0 | |
4352 | && (ecs->event_thread->control.step_range_start <= stop_pc | |
4353 | && stop_pc < ecs->event_thread->control.step_range_end) | |
edb3359d | 4354 | && frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 4355 | ecs->event_thread->control.step_stack_frame_id) |
8358c15c | 4356 | && ecs->event_thread->control.step_resume_breakpoint == NULL) |
d303a6c7 AC |
4357 | { |
4358 | /* The inferior is about to take a signal that will take it | |
4359 | out of the single step range. Set a breakpoint at the | |
4360 | current PC (which is presumably where the signal handler | |
4361 | will eventually return) and then allow the inferior to | |
4362 | run free. | |
4363 | ||
4364 | Note that this is only needed for a signal delivered | |
4365 | while in the single-step range. Nested signals aren't a | |
4366 | problem as they eventually all return. */ | |
237fc4c9 PA |
4367 | if (debug_infrun) |
4368 | fprintf_unfiltered (gdb_stdlog, | |
4369 | "infrun: signal may take us out of " | |
4370 | "single-step range\n"); | |
4371 | ||
2c03e5be | 4372 | insert_hp_step_resume_breakpoint_at_frame (frame); |
2455069d UW |
4373 | /* Reset trap_expected to ensure breakpoints are re-inserted. */ |
4374 | ecs->event_thread->control.trap_expected = 0; | |
9d799f85 AC |
4375 | keep_going (ecs); |
4376 | return; | |
d303a6c7 | 4377 | } |
9d799f85 AC |
4378 | |
4379 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
4380 | when either there's a nested signal, or when there's a | |
4381 | pending signal enabled just as the signal handler returns | |
4382 | (leaving the inferior at the step-resume-breakpoint without | |
4383 | actually executing it). Either way continue until the | |
4384 | breakpoint is really hit. */ | |
488f131b JB |
4385 | keep_going (ecs); |
4386 | return; | |
4387 | } | |
4388 | ||
4389 | /* Handle cases caused by hitting a breakpoint. */ | |
4390 | { | |
4391 | CORE_ADDR jmp_buf_pc; | |
4392 | struct bpstat_what what; | |
4393 | ||
16c381f0 | 4394 | what = bpstat_what (ecs->event_thread->control.stop_bpstat); |
488f131b JB |
4395 | |
4396 | if (what.call_dummy) | |
4397 | { | |
aa7d318d | 4398 | stop_stack_dummy = what.call_dummy; |
c5aa993b | 4399 | } |
c906108c | 4400 | |
628fe4e4 JK |
4401 | /* If we hit an internal event that triggers symbol changes, the |
4402 | current frame will be invalidated within bpstat_what (e.g., if | |
4403 | we hit an internal solib event). Re-fetch it. */ | |
4404 | frame = get_current_frame (); | |
4405 | gdbarch = get_frame_arch (frame); | |
4406 | ||
488f131b | 4407 | switch (what.main_action) |
c5aa993b | 4408 | { |
488f131b | 4409 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
611c83ae PA |
4410 | /* If we hit the breakpoint at longjmp while stepping, we |
4411 | install a momentary breakpoint at the target of the | |
4412 | jmp_buf. */ | |
4413 | ||
4414 | if (debug_infrun) | |
4415 | fprintf_unfiltered (gdb_stdlog, | |
4416 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
4417 | ||
4e1c45ea | 4418 | ecs->event_thread->stepping_over_breakpoint = 1; |
611c83ae | 4419 | |
186c406b | 4420 | if (what.is_longjmp) |
c5aa993b | 4421 | { |
186c406b TT |
4422 | if (!gdbarch_get_longjmp_target_p (gdbarch) |
4423 | || !gdbarch_get_longjmp_target (gdbarch, | |
4424 | frame, &jmp_buf_pc)) | |
4425 | { | |
4426 | if (debug_infrun) | |
3e43a32a MS |
4427 | fprintf_unfiltered (gdb_stdlog, |
4428 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME " | |
4429 | "(!gdbarch_get_longjmp_target)\n"); | |
186c406b TT |
4430 | keep_going (ecs); |
4431 | return; | |
4432 | } | |
488f131b | 4433 | |
186c406b TT |
4434 | /* We're going to replace the current step-resume breakpoint |
4435 | with a longjmp-resume breakpoint. */ | |
4436 | delete_step_resume_breakpoint (ecs->event_thread); | |
611c83ae | 4437 | |
186c406b TT |
4438 | /* Insert a breakpoint at resume address. */ |
4439 | insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc); | |
4440 | } | |
4441 | else | |
4442 | { | |
4443 | struct symbol *func = get_frame_function (frame); | |
c906108c | 4444 | |
186c406b TT |
4445 | if (func) |
4446 | check_exception_resume (ecs, frame, func); | |
4447 | } | |
488f131b JB |
4448 | keep_going (ecs); |
4449 | return; | |
c906108c | 4450 | |
488f131b | 4451 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
527159b7 | 4452 | if (debug_infrun) |
611c83ae PA |
4453 | fprintf_unfiltered (gdb_stdlog, |
4454 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
4455 | ||
186c406b TT |
4456 | if (what.is_longjmp) |
4457 | { | |
4458 | gdb_assert (ecs->event_thread->control.step_resume_breakpoint | |
4459 | != NULL); | |
4460 | delete_step_resume_breakpoint (ecs->event_thread); | |
4461 | } | |
4462 | else | |
4463 | { | |
4464 | /* There are several cases to consider. | |
4465 | ||
4466 | 1. The initiating frame no longer exists. In this case | |
4467 | we must stop, because the exception has gone too far. | |
4468 | ||
4469 | 2. The initiating frame exists, and is the same as the | |
4470 | current frame. We stop, because the exception has been | |
4471 | caught. | |
4472 | ||
4473 | 3. The initiating frame exists and is different from | |
4474 | the current frame. This means the exception has been | |
4475 | caught beneath the initiating frame, so keep going. */ | |
4476 | struct frame_info *init_frame | |
4477 | = frame_find_by_id (ecs->event_thread->initiating_frame); | |
4478 | ||
4479 | gdb_assert (ecs->event_thread->control.exception_resume_breakpoint | |
4480 | != NULL); | |
4481 | delete_exception_resume_breakpoint (ecs->event_thread); | |
4482 | ||
4483 | if (init_frame) | |
4484 | { | |
4485 | struct frame_id current_id | |
4486 | = get_frame_id (get_current_frame ()); | |
4487 | if (frame_id_eq (current_id, | |
4488 | ecs->event_thread->initiating_frame)) | |
4489 | { | |
4490 | /* Case 2. Fall through. */ | |
4491 | } | |
4492 | else | |
4493 | { | |
4494 | /* Case 3. */ | |
4495 | keep_going (ecs); | |
4496 | return; | |
4497 | } | |
4498 | } | |
4499 | ||
4500 | /* For Cases 1 and 2, remove the step-resume breakpoint, | |
4501 | if it exists. */ | |
4502 | delete_step_resume_breakpoint (ecs->event_thread); | |
4503 | } | |
611c83ae | 4504 | |
16c381f0 | 4505 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 4506 | print_end_stepping_range_reason (); |
611c83ae PA |
4507 | stop_stepping (ecs); |
4508 | return; | |
488f131b JB |
4509 | |
4510 | case BPSTAT_WHAT_SINGLE: | |
527159b7 | 4511 | if (debug_infrun) |
8802d8ed | 4512 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); |
4e1c45ea | 4513 | ecs->event_thread->stepping_over_breakpoint = 1; |
488f131b JB |
4514 | /* Still need to check other stuff, at least the case |
4515 | where we are stepping and step out of the right range. */ | |
4516 | break; | |
c906108c | 4517 | |
2c03e5be PA |
4518 | case BPSTAT_WHAT_STEP_RESUME: |
4519 | if (debug_infrun) | |
4520 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); | |
4521 | ||
4522 | delete_step_resume_breakpoint (ecs->event_thread); | |
9da8c2a0 PA |
4523 | if (ecs->event_thread->control.proceed_to_finish |
4524 | && execution_direction == EXEC_REVERSE) | |
4525 | { | |
4526 | struct thread_info *tp = ecs->event_thread; | |
4527 | ||
4528 | /* We are finishing a function in reverse, and just hit | |
4529 | the step-resume breakpoint at the start address of the | |
4530 | function, and we're almost there -- just need to back | |
4531 | up by one more single-step, which should take us back | |
4532 | to the function call. */ | |
4533 | tp->control.step_range_start = tp->control.step_range_end = 1; | |
4534 | keep_going (ecs); | |
4535 | return; | |
4536 | } | |
7e324e48 | 4537 | fill_in_stop_func (gdbarch, ecs); |
2c03e5be PA |
4538 | if (stop_pc == ecs->stop_func_start |
4539 | && execution_direction == EXEC_REVERSE) | |
4540 | { | |
4541 | /* We are stepping over a function call in reverse, and | |
4542 | just hit the step-resume breakpoint at the start | |
4543 | address of the function. Go back to single-stepping, | |
4544 | which should take us back to the function call. */ | |
4545 | ecs->event_thread->stepping_over_breakpoint = 1; | |
4546 | keep_going (ecs); | |
4547 | return; | |
4548 | } | |
4549 | break; | |
4550 | ||
488f131b | 4551 | case BPSTAT_WHAT_STOP_NOISY: |
527159b7 | 4552 | if (debug_infrun) |
8802d8ed | 4553 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); |
488f131b | 4554 | stop_print_frame = 1; |
c906108c | 4555 | |
d303a6c7 AC |
4556 | /* We are about to nuke the step_resume_breakpointt via the |
4557 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 4558 | |
488f131b JB |
4559 | stop_stepping (ecs); |
4560 | return; | |
c5aa993b | 4561 | |
488f131b | 4562 | case BPSTAT_WHAT_STOP_SILENT: |
527159b7 | 4563 | if (debug_infrun) |
8802d8ed | 4564 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); |
488f131b | 4565 | stop_print_frame = 0; |
c5aa993b | 4566 | |
d303a6c7 AC |
4567 | /* We are about to nuke the step_resume_breakpoin via the |
4568 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 4569 | |
488f131b | 4570 | stop_stepping (ecs); |
e441088d | 4571 | return; |
c5aa993b | 4572 | |
2c03e5be | 4573 | case BPSTAT_WHAT_HP_STEP_RESUME: |
527159b7 | 4574 | if (debug_infrun) |
2c03e5be | 4575 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_HP_STEP_RESUME\n"); |
527159b7 | 4576 | |
4e1c45ea PA |
4577 | delete_step_resume_breakpoint (ecs->event_thread); |
4578 | if (ecs->event_thread->step_after_step_resume_breakpoint) | |
68f53502 AC |
4579 | { |
4580 | /* Back when the step-resume breakpoint was inserted, we | |
4581 | were trying to single-step off a breakpoint. Go back | |
4582 | to doing that. */ | |
4e1c45ea PA |
4583 | ecs->event_thread->step_after_step_resume_breakpoint = 0; |
4584 | ecs->event_thread->stepping_over_breakpoint = 1; | |
68f53502 AC |
4585 | keep_going (ecs); |
4586 | return; | |
4587 | } | |
488f131b JB |
4588 | break; |
4589 | ||
488f131b JB |
4590 | case BPSTAT_WHAT_KEEP_CHECKING: |
4591 | break; | |
4592 | } | |
4593 | } | |
c906108c | 4594 | |
488f131b JB |
4595 | /* We come here if we hit a breakpoint but should not |
4596 | stop for it. Possibly we also were stepping | |
4597 | and should stop for that. So fall through and | |
4598 | test for stepping. But, if not stepping, | |
4599 | do not stop. */ | |
c906108c | 4600 | |
a7212384 UW |
4601 | /* In all-stop mode, if we're currently stepping but have stopped in |
4602 | some other thread, we need to switch back to the stepped thread. */ | |
4603 | if (!non_stop) | |
4604 | { | |
4605 | struct thread_info *tp; | |
abbb1732 | 4606 | |
b3444185 | 4607 | tp = iterate_over_threads (currently_stepping_or_nexting_callback, |
a7212384 UW |
4608 | ecs->event_thread); |
4609 | if (tp) | |
4610 | { | |
4611 | /* However, if the current thread is blocked on some internal | |
4612 | breakpoint, and we simply need to step over that breakpoint | |
4613 | to get it going again, do that first. */ | |
16c381f0 JK |
4614 | if ((ecs->event_thread->control.trap_expected |
4615 | && ecs->event_thread->suspend.stop_signal != TARGET_SIGNAL_TRAP) | |
a7212384 UW |
4616 | || ecs->event_thread->stepping_over_breakpoint) |
4617 | { | |
4618 | keep_going (ecs); | |
4619 | return; | |
4620 | } | |
4621 | ||
66852e9c PA |
4622 | /* If the stepping thread exited, then don't try to switch |
4623 | back and resume it, which could fail in several different | |
4624 | ways depending on the target. Instead, just keep going. | |
4625 | ||
4626 | We can find a stepping dead thread in the thread list in | |
4627 | two cases: | |
4628 | ||
4629 | - The target supports thread exit events, and when the | |
4630 | target tries to delete the thread from the thread list, | |
4631 | inferior_ptid pointed at the exiting thread. In such | |
4632 | case, calling delete_thread does not really remove the | |
4633 | thread from the list; instead, the thread is left listed, | |
4634 | with 'exited' state. | |
4635 | ||
4636 | - The target's debug interface does not support thread | |
4637 | exit events, and so we have no idea whatsoever if the | |
4638 | previously stepping thread is still alive. For that | |
4639 | reason, we need to synchronously query the target | |
4640 | now. */ | |
b3444185 PA |
4641 | if (is_exited (tp->ptid) |
4642 | || !target_thread_alive (tp->ptid)) | |
4643 | { | |
4644 | if (debug_infrun) | |
3e43a32a MS |
4645 | fprintf_unfiltered (gdb_stdlog, |
4646 | "infrun: not switching back to " | |
4647 | "stepped thread, it has vanished\n"); | |
b3444185 PA |
4648 | |
4649 | delete_thread (tp->ptid); | |
4650 | keep_going (ecs); | |
4651 | return; | |
4652 | } | |
4653 | ||
a7212384 UW |
4654 | /* Otherwise, we no longer expect a trap in the current thread. |
4655 | Clear the trap_expected flag before switching back -- this is | |
4656 | what keep_going would do as well, if we called it. */ | |
16c381f0 | 4657 | ecs->event_thread->control.trap_expected = 0; |
a7212384 UW |
4658 | |
4659 | if (debug_infrun) | |
4660 | fprintf_unfiltered (gdb_stdlog, | |
4661 | "infrun: switching back to stepped thread\n"); | |
4662 | ||
4663 | ecs->event_thread = tp; | |
4664 | ecs->ptid = tp->ptid; | |
4665 | context_switch (ecs->ptid); | |
4666 | keep_going (ecs); | |
4667 | return; | |
4668 | } | |
4669 | } | |
4670 | ||
8358c15c | 4671 | if (ecs->event_thread->control.step_resume_breakpoint) |
488f131b | 4672 | { |
527159b7 | 4673 | if (debug_infrun) |
d3169d93 DJ |
4674 | fprintf_unfiltered (gdb_stdlog, |
4675 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 4676 | |
488f131b JB |
4677 | /* Having a step-resume breakpoint overrides anything |
4678 | else having to do with stepping commands until | |
4679 | that breakpoint is reached. */ | |
488f131b JB |
4680 | keep_going (ecs); |
4681 | return; | |
4682 | } | |
c5aa993b | 4683 | |
16c381f0 | 4684 | if (ecs->event_thread->control.step_range_end == 0) |
488f131b | 4685 | { |
527159b7 | 4686 | if (debug_infrun) |
8a9de0e4 | 4687 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 4688 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
4689 | keep_going (ecs); |
4690 | return; | |
4691 | } | |
c5aa993b | 4692 | |
4b7703ad JB |
4693 | /* Re-fetch current thread's frame in case the code above caused |
4694 | the frame cache to be re-initialized, making our FRAME variable | |
4695 | a dangling pointer. */ | |
4696 | frame = get_current_frame (); | |
628fe4e4 | 4697 | gdbarch = get_frame_arch (frame); |
7e324e48 | 4698 | fill_in_stop_func (gdbarch, ecs); |
4b7703ad | 4699 | |
488f131b | 4700 | /* If stepping through a line, keep going if still within it. |
c906108c | 4701 | |
488f131b JB |
4702 | Note that step_range_end is the address of the first instruction |
4703 | beyond the step range, and NOT the address of the last instruction | |
31410e84 MS |
4704 | within it! |
4705 | ||
4706 | Note also that during reverse execution, we may be stepping | |
4707 | through a function epilogue and therefore must detect when | |
4708 | the current-frame changes in the middle of a line. */ | |
4709 | ||
16c381f0 JK |
4710 | if (stop_pc >= ecs->event_thread->control.step_range_start |
4711 | && stop_pc < ecs->event_thread->control.step_range_end | |
31410e84 | 4712 | && (execution_direction != EXEC_REVERSE |
388a8562 | 4713 | || frame_id_eq (get_frame_id (frame), |
16c381f0 | 4714 | ecs->event_thread->control.step_frame_id))) |
488f131b | 4715 | { |
527159b7 | 4716 | if (debug_infrun) |
5af949e3 UW |
4717 | fprintf_unfiltered |
4718 | (gdb_stdlog, "infrun: stepping inside range [%s-%s]\n", | |
16c381f0 JK |
4719 | paddress (gdbarch, ecs->event_thread->control.step_range_start), |
4720 | paddress (gdbarch, ecs->event_thread->control.step_range_end)); | |
b2175913 MS |
4721 | |
4722 | /* When stepping backward, stop at beginning of line range | |
4723 | (unless it's the function entry point, in which case | |
4724 | keep going back to the call point). */ | |
16c381f0 | 4725 | if (stop_pc == ecs->event_thread->control.step_range_start |
b2175913 MS |
4726 | && stop_pc != ecs->stop_func_start |
4727 | && execution_direction == EXEC_REVERSE) | |
4728 | { | |
16c381f0 | 4729 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 4730 | print_end_stepping_range_reason (); |
b2175913 MS |
4731 | stop_stepping (ecs); |
4732 | } | |
4733 | else | |
4734 | keep_going (ecs); | |
4735 | ||
488f131b JB |
4736 | return; |
4737 | } | |
c5aa993b | 4738 | |
488f131b | 4739 | /* We stepped out of the stepping range. */ |
c906108c | 4740 | |
488f131b | 4741 | /* If we are stepping at the source level and entered the runtime |
388a8562 MS |
4742 | loader dynamic symbol resolution code... |
4743 | ||
4744 | EXEC_FORWARD: we keep on single stepping until we exit the run | |
4745 | time loader code and reach the callee's address. | |
4746 | ||
4747 | EXEC_REVERSE: we've already executed the callee (backward), and | |
4748 | the runtime loader code is handled just like any other | |
4749 | undebuggable function call. Now we need only keep stepping | |
4750 | backward through the trampoline code, and that's handled further | |
4751 | down, so there is nothing for us to do here. */ | |
4752 | ||
4753 | if (execution_direction != EXEC_REVERSE | |
16c381f0 | 4754 | && ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
cfd8ab24 | 4755 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 4756 | { |
4c8c40e6 | 4757 | CORE_ADDR pc_after_resolver = |
568d6575 | 4758 | gdbarch_skip_solib_resolver (gdbarch, stop_pc); |
c906108c | 4759 | |
527159b7 | 4760 | if (debug_infrun) |
3e43a32a MS |
4761 | fprintf_unfiltered (gdb_stdlog, |
4762 | "infrun: stepped into dynsym resolve code\n"); | |
527159b7 | 4763 | |
488f131b JB |
4764 | if (pc_after_resolver) |
4765 | { | |
4766 | /* Set up a step-resume breakpoint at the address | |
4767 | indicated by SKIP_SOLIB_RESOLVER. */ | |
4768 | struct symtab_and_line sr_sal; | |
abbb1732 | 4769 | |
fe39c653 | 4770 | init_sal (&sr_sal); |
488f131b | 4771 | sr_sal.pc = pc_after_resolver; |
6c95b8df | 4772 | sr_sal.pspace = get_frame_program_space (frame); |
488f131b | 4773 | |
a6d9a66e UW |
4774 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4775 | sr_sal, null_frame_id); | |
c5aa993b | 4776 | } |
c906108c | 4777 | |
488f131b JB |
4778 | keep_going (ecs); |
4779 | return; | |
4780 | } | |
c906108c | 4781 | |
16c381f0 JK |
4782 | if (ecs->event_thread->control.step_range_end != 1 |
4783 | && (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE | |
4784 | || ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) | |
568d6575 | 4785 | && get_frame_type (frame) == SIGTRAMP_FRAME) |
488f131b | 4786 | { |
527159b7 | 4787 | if (debug_infrun) |
3e43a32a MS |
4788 | fprintf_unfiltered (gdb_stdlog, |
4789 | "infrun: stepped into signal trampoline\n"); | |
42edda50 | 4790 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
4791 | a signal trampoline (either by a signal being delivered or by |
4792 | the signal handler returning). Just single-step until the | |
4793 | inferior leaves the trampoline (either by calling the handler | |
4794 | or returning). */ | |
488f131b JB |
4795 | keep_going (ecs); |
4796 | return; | |
4797 | } | |
c906108c | 4798 | |
c17eaafe DJ |
4799 | /* Check for subroutine calls. The check for the current frame |
4800 | equalling the step ID is not necessary - the check of the | |
4801 | previous frame's ID is sufficient - but it is a common case and | |
4802 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
4803 | |
4804 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
4805 | being equal, so to get into this block, both the current and | |
4806 | previous frame must have valid frame IDs. */ | |
005ca36a JB |
4807 | /* The outer_frame_id check is a heuristic to detect stepping |
4808 | through startup code. If we step over an instruction which | |
4809 | sets the stack pointer from an invalid value to a valid value, | |
4810 | we may detect that as a subroutine call from the mythical | |
4811 | "outermost" function. This could be fixed by marking | |
4812 | outermost frames as !stack_p,code_p,special_p. Then the | |
4813 | initial outermost frame, before sp was valid, would | |
ce6cca6d | 4814 | have code_addr == &_start. See the comment in frame_id_eq |
005ca36a | 4815 | for more. */ |
edb3359d | 4816 | if (!frame_id_eq (get_stack_frame_id (frame), |
16c381f0 | 4817 | ecs->event_thread->control.step_stack_frame_id) |
005ca36a | 4818 | && (frame_id_eq (frame_unwind_caller_id (get_current_frame ()), |
16c381f0 JK |
4819 | ecs->event_thread->control.step_stack_frame_id) |
4820 | && (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id, | |
005ca36a JB |
4821 | outer_frame_id) |
4822 | || step_start_function != find_pc_function (stop_pc)))) | |
488f131b | 4823 | { |
95918acb | 4824 | CORE_ADDR real_stop_pc; |
8fb3e588 | 4825 | |
527159b7 | 4826 | if (debug_infrun) |
8a9de0e4 | 4827 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 4828 | |
16c381f0 JK |
4829 | if ((ecs->event_thread->control.step_over_calls == STEP_OVER_NONE) |
4830 | || ((ecs->event_thread->control.step_range_end == 1) | |
d80b854b | 4831 | && in_prologue (gdbarch, ecs->event_thread->prev_pc, |
4e1c45ea | 4832 | ecs->stop_func_start))) |
95918acb AC |
4833 | { |
4834 | /* I presume that step_over_calls is only 0 when we're | |
4835 | supposed to be stepping at the assembly language level | |
4836 | ("stepi"). Just stop. */ | |
4837 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
4838 | thought it was a subroutine call but it was not. Stop as | |
4839 | well. FENN */ | |
388a8562 | 4840 | /* And this works the same backward as frontward. MVS */ |
16c381f0 | 4841 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 4842 | print_end_stepping_range_reason (); |
95918acb AC |
4843 | stop_stepping (ecs); |
4844 | return; | |
4845 | } | |
8fb3e588 | 4846 | |
388a8562 MS |
4847 | /* Reverse stepping through solib trampolines. */ |
4848 | ||
4849 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 4850 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE |
388a8562 MS |
4851 | && (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) |
4852 | || (ecs->stop_func_start == 0 | |
4853 | && in_solib_dynsym_resolve_code (stop_pc)))) | |
4854 | { | |
4855 | /* Any solib trampoline code can be handled in reverse | |
4856 | by simply continuing to single-step. We have already | |
4857 | executed the solib function (backwards), and a few | |
4858 | steps will take us back through the trampoline to the | |
4859 | caller. */ | |
4860 | keep_going (ecs); | |
4861 | return; | |
4862 | } | |
4863 | ||
16c381f0 | 4864 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
8567c30f | 4865 | { |
b2175913 MS |
4866 | /* We're doing a "next". |
4867 | ||
4868 | Normal (forward) execution: set a breakpoint at the | |
4869 | callee's return address (the address at which the caller | |
4870 | will resume). | |
4871 | ||
4872 | Reverse (backward) execution. set the step-resume | |
4873 | breakpoint at the start of the function that we just | |
4874 | stepped into (backwards), and continue to there. When we | |
6130d0b7 | 4875 | get there, we'll need to single-step back to the caller. */ |
b2175913 MS |
4876 | |
4877 | if (execution_direction == EXEC_REVERSE) | |
4878 | { | |
4879 | struct symtab_and_line sr_sal; | |
3067f6e5 | 4880 | |
388a8562 MS |
4881 | /* Normal function call return (static or dynamic). */ |
4882 | init_sal (&sr_sal); | |
4883 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df PA |
4884 | sr_sal.pspace = get_frame_program_space (frame); |
4885 | insert_step_resume_breakpoint_at_sal (gdbarch, | |
4886 | sr_sal, null_frame_id); | |
b2175913 MS |
4887 | } |
4888 | else | |
568d6575 | 4889 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 4890 | |
8567c30f AC |
4891 | keep_going (ecs); |
4892 | return; | |
4893 | } | |
a53c66de | 4894 | |
95918acb | 4895 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
4896 | calling routine and the real function), locate the real |
4897 | function. That's what tells us (a) whether we want to step | |
4898 | into it at all, and (b) what prologue we want to run to the | |
4899 | end of, if we do step into it. */ | |
568d6575 | 4900 | real_stop_pc = skip_language_trampoline (frame, stop_pc); |
95918acb | 4901 | if (real_stop_pc == 0) |
568d6575 | 4902 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
95918acb AC |
4903 | if (real_stop_pc != 0) |
4904 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 4905 | |
db5f024e | 4906 | if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc)) |
1b2bfbb9 RC |
4907 | { |
4908 | struct symtab_and_line sr_sal; | |
abbb1732 | 4909 | |
1b2bfbb9 RC |
4910 | init_sal (&sr_sal); |
4911 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 4912 | sr_sal.pspace = get_frame_program_space (frame); |
1b2bfbb9 | 4913 | |
a6d9a66e UW |
4914 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4915 | sr_sal, null_frame_id); | |
8fb3e588 AC |
4916 | keep_going (ecs); |
4917 | return; | |
1b2bfbb9 RC |
4918 | } |
4919 | ||
95918acb | 4920 | /* If we have line number information for the function we are |
1bfeeb0f JL |
4921 | thinking of stepping into and the function isn't on the skip |
4922 | list, step into it. | |
95918acb | 4923 | |
8fb3e588 AC |
4924 | If there are several symtabs at that PC (e.g. with include |
4925 | files), just want to know whether *any* of them have line | |
4926 | numbers. find_pc_line handles this. */ | |
95918acb AC |
4927 | { |
4928 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 4929 | |
95918acb | 4930 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2b914b52 JB |
4931 | if (tmp_sal.line != 0 |
4932 | && !function_pc_is_marked_for_skip (ecs->stop_func_start)) | |
95918acb | 4933 | { |
b2175913 | 4934 | if (execution_direction == EXEC_REVERSE) |
568d6575 | 4935 | handle_step_into_function_backward (gdbarch, ecs); |
b2175913 | 4936 | else |
568d6575 | 4937 | handle_step_into_function (gdbarch, ecs); |
95918acb AC |
4938 | return; |
4939 | } | |
4940 | } | |
4941 | ||
4942 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
4943 | set, we stop the step so that the user has a chance to switch |
4944 | in assembly mode. */ | |
16c381f0 | 4945 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
078130d0 | 4946 | && step_stop_if_no_debug) |
95918acb | 4947 | { |
16c381f0 | 4948 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 4949 | print_end_stepping_range_reason (); |
95918acb AC |
4950 | stop_stepping (ecs); |
4951 | return; | |
4952 | } | |
4953 | ||
b2175913 MS |
4954 | if (execution_direction == EXEC_REVERSE) |
4955 | { | |
4956 | /* Set a breakpoint at callee's start address. | |
4957 | From there we can step once and be back in the caller. */ | |
4958 | struct symtab_and_line sr_sal; | |
abbb1732 | 4959 | |
b2175913 MS |
4960 | init_sal (&sr_sal); |
4961 | sr_sal.pc = ecs->stop_func_start; | |
6c95b8df | 4962 | sr_sal.pspace = get_frame_program_space (frame); |
a6d9a66e UW |
4963 | insert_step_resume_breakpoint_at_sal (gdbarch, |
4964 | sr_sal, null_frame_id); | |
b2175913 MS |
4965 | } |
4966 | else | |
4967 | /* Set a breakpoint at callee's return address (the address | |
4968 | at which the caller will resume). */ | |
568d6575 | 4969 | insert_step_resume_breakpoint_at_caller (frame); |
b2175913 | 4970 | |
95918acb | 4971 | keep_going (ecs); |
488f131b | 4972 | return; |
488f131b | 4973 | } |
c906108c | 4974 | |
fdd654f3 MS |
4975 | /* Reverse stepping through solib trampolines. */ |
4976 | ||
4977 | if (execution_direction == EXEC_REVERSE | |
16c381f0 | 4978 | && ecs->event_thread->control.step_over_calls != STEP_OVER_NONE) |
fdd654f3 MS |
4979 | { |
4980 | if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc) | |
4981 | || (ecs->stop_func_start == 0 | |
4982 | && in_solib_dynsym_resolve_code (stop_pc))) | |
4983 | { | |
4984 | /* Any solib trampoline code can be handled in reverse | |
4985 | by simply continuing to single-step. We have already | |
4986 | executed the solib function (backwards), and a few | |
4987 | steps will take us back through the trampoline to the | |
4988 | caller. */ | |
4989 | keep_going (ecs); | |
4990 | return; | |
4991 | } | |
4992 | else if (in_solib_dynsym_resolve_code (stop_pc)) | |
4993 | { | |
4994 | /* Stepped backward into the solib dynsym resolver. | |
4995 | Set a breakpoint at its start and continue, then | |
4996 | one more step will take us out. */ | |
4997 | struct symtab_and_line sr_sal; | |
abbb1732 | 4998 | |
fdd654f3 MS |
4999 | init_sal (&sr_sal); |
5000 | sr_sal.pc = ecs->stop_func_start; | |
9d1807c3 | 5001 | sr_sal.pspace = get_frame_program_space (frame); |
fdd654f3 MS |
5002 | insert_step_resume_breakpoint_at_sal (gdbarch, |
5003 | sr_sal, null_frame_id); | |
5004 | keep_going (ecs); | |
5005 | return; | |
5006 | } | |
5007 | } | |
5008 | ||
488f131b JB |
5009 | /* If we're in the return path from a shared library trampoline, |
5010 | we want to proceed through the trampoline when stepping. */ | |
568d6575 | 5011 | if (gdbarch_in_solib_return_trampoline (gdbarch, |
e76f05fa | 5012 | stop_pc, ecs->stop_func_name)) |
488f131b | 5013 | { |
488f131b | 5014 | /* Determine where this trampoline returns. */ |
52f729a7 | 5015 | CORE_ADDR real_stop_pc; |
abbb1732 | 5016 | |
568d6575 | 5017 | real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc); |
c906108c | 5018 | |
527159b7 | 5019 | if (debug_infrun) |
3e43a32a MS |
5020 | fprintf_unfiltered (gdb_stdlog, |
5021 | "infrun: stepped into solib return tramp\n"); | |
527159b7 | 5022 | |
488f131b | 5023 | /* Only proceed through if we know where it's going. */ |
d764a824 | 5024 | if (real_stop_pc) |
488f131b | 5025 | { |
1777feb0 | 5026 | /* And put the step-breakpoint there and go until there. */ |
488f131b JB |
5027 | struct symtab_and_line sr_sal; |
5028 | ||
fe39c653 | 5029 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 5030 | sr_sal.pc = real_stop_pc; |
488f131b | 5031 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5032 | sr_sal.pspace = get_frame_program_space (frame); |
44cbf7b5 AC |
5033 | |
5034 | /* Do not specify what the fp should be when we stop since | |
5035 | on some machines the prologue is where the new fp value | |
5036 | is established. */ | |
a6d9a66e UW |
5037 | insert_step_resume_breakpoint_at_sal (gdbarch, |
5038 | sr_sal, null_frame_id); | |
c906108c | 5039 | |
488f131b JB |
5040 | /* Restart without fiddling with the step ranges or |
5041 | other state. */ | |
5042 | keep_going (ecs); | |
5043 | return; | |
5044 | } | |
5045 | } | |
c906108c | 5046 | |
2afb61aa | 5047 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 5048 | |
1b2bfbb9 RC |
5049 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
5050 | the trampoline processing logic, however, there are some trampolines | |
5051 | that have no names, so we should do trampoline handling first. */ | |
16c381f0 | 5052 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE |
7ed0fe66 | 5053 | && ecs->stop_func_name == NULL |
2afb61aa | 5054 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 5055 | { |
527159b7 | 5056 | if (debug_infrun) |
3e43a32a MS |
5057 | fprintf_unfiltered (gdb_stdlog, |
5058 | "infrun: stepped into undebuggable function\n"); | |
527159b7 | 5059 | |
1b2bfbb9 | 5060 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
5061 | undebuggable function (where there is no debugging information |
5062 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
5063 | inferior stopped). Since we want to skip this kind of code, |
5064 | we keep going until the inferior returns from this | |
14e60db5 DJ |
5065 | function - unless the user has asked us not to (via |
5066 | set step-mode) or we no longer know how to get back | |
5067 | to the call site. */ | |
5068 | if (step_stop_if_no_debug | |
c7ce8faa | 5069 | || !frame_id_p (frame_unwind_caller_id (frame))) |
1b2bfbb9 RC |
5070 | { |
5071 | /* If we have no line number and the step-stop-if-no-debug | |
5072 | is set, we stop the step so that the user has a chance to | |
5073 | switch in assembly mode. */ | |
16c381f0 | 5074 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5075 | print_end_stepping_range_reason (); |
1b2bfbb9 RC |
5076 | stop_stepping (ecs); |
5077 | return; | |
5078 | } | |
5079 | else | |
5080 | { | |
5081 | /* Set a breakpoint at callee's return address (the address | |
5082 | at which the caller will resume). */ | |
568d6575 | 5083 | insert_step_resume_breakpoint_at_caller (frame); |
1b2bfbb9 RC |
5084 | keep_going (ecs); |
5085 | return; | |
5086 | } | |
5087 | } | |
5088 | ||
16c381f0 | 5089 | if (ecs->event_thread->control.step_range_end == 1) |
1b2bfbb9 RC |
5090 | { |
5091 | /* It is stepi or nexti. We always want to stop stepping after | |
5092 | one instruction. */ | |
527159b7 | 5093 | if (debug_infrun) |
8a9de0e4 | 5094 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
16c381f0 | 5095 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5096 | print_end_stepping_range_reason (); |
1b2bfbb9 RC |
5097 | stop_stepping (ecs); |
5098 | return; | |
5099 | } | |
5100 | ||
2afb61aa | 5101 | if (stop_pc_sal.line == 0) |
488f131b JB |
5102 | { |
5103 | /* We have no line number information. That means to stop | |
5104 | stepping (does this always happen right after one instruction, | |
5105 | when we do "s" in a function with no line numbers, | |
5106 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 5107 | if (debug_infrun) |
8a9de0e4 | 5108 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
16c381f0 | 5109 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5110 | print_end_stepping_range_reason (); |
488f131b JB |
5111 | stop_stepping (ecs); |
5112 | return; | |
5113 | } | |
c906108c | 5114 | |
edb3359d DJ |
5115 | /* Look for "calls" to inlined functions, part one. If the inline |
5116 | frame machinery detected some skipped call sites, we have entered | |
5117 | a new inline function. */ | |
5118 | ||
5119 | if (frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 5120 | ecs->event_thread->control.step_frame_id) |
edb3359d DJ |
5121 | && inline_skipped_frames (ecs->ptid)) |
5122 | { | |
5123 | struct symtab_and_line call_sal; | |
5124 | ||
5125 | if (debug_infrun) | |
5126 | fprintf_unfiltered (gdb_stdlog, | |
5127 | "infrun: stepped into inlined function\n"); | |
5128 | ||
5129 | find_frame_sal (get_current_frame (), &call_sal); | |
5130 | ||
16c381f0 | 5131 | if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL) |
edb3359d DJ |
5132 | { |
5133 | /* For "step", we're going to stop. But if the call site | |
5134 | for this inlined function is on the same source line as | |
5135 | we were previously stepping, go down into the function | |
5136 | first. Otherwise stop at the call site. */ | |
5137 | ||
5138 | if (call_sal.line == ecs->event_thread->current_line | |
5139 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
5140 | step_into_inline_frame (ecs->ptid); | |
5141 | ||
16c381f0 | 5142 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5143 | print_end_stepping_range_reason (); |
edb3359d DJ |
5144 | stop_stepping (ecs); |
5145 | return; | |
5146 | } | |
5147 | else | |
5148 | { | |
5149 | /* For "next", we should stop at the call site if it is on a | |
5150 | different source line. Otherwise continue through the | |
5151 | inlined function. */ | |
5152 | if (call_sal.line == ecs->event_thread->current_line | |
5153 | && call_sal.symtab == ecs->event_thread->current_symtab) | |
5154 | keep_going (ecs); | |
5155 | else | |
5156 | { | |
16c381f0 | 5157 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5158 | print_end_stepping_range_reason (); |
edb3359d DJ |
5159 | stop_stepping (ecs); |
5160 | } | |
5161 | return; | |
5162 | } | |
5163 | } | |
5164 | ||
5165 | /* Look for "calls" to inlined functions, part two. If we are still | |
5166 | in the same real function we were stepping through, but we have | |
5167 | to go further up to find the exact frame ID, we are stepping | |
5168 | through a more inlined call beyond its call site. */ | |
5169 | ||
5170 | if (get_frame_type (get_current_frame ()) == INLINE_FRAME | |
5171 | && !frame_id_eq (get_frame_id (get_current_frame ()), | |
16c381f0 | 5172 | ecs->event_thread->control.step_frame_id) |
edb3359d | 5173 | && stepped_in_from (get_current_frame (), |
16c381f0 | 5174 | ecs->event_thread->control.step_frame_id)) |
edb3359d DJ |
5175 | { |
5176 | if (debug_infrun) | |
5177 | fprintf_unfiltered (gdb_stdlog, | |
5178 | "infrun: stepping through inlined function\n"); | |
5179 | ||
16c381f0 | 5180 | if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL) |
edb3359d DJ |
5181 | keep_going (ecs); |
5182 | else | |
5183 | { | |
16c381f0 | 5184 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5185 | print_end_stepping_range_reason (); |
edb3359d DJ |
5186 | stop_stepping (ecs); |
5187 | } | |
5188 | return; | |
5189 | } | |
5190 | ||
2afb61aa | 5191 | if ((stop_pc == stop_pc_sal.pc) |
4e1c45ea PA |
5192 | && (ecs->event_thread->current_line != stop_pc_sal.line |
5193 | || ecs->event_thread->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
5194 | { |
5195 | /* We are at the start of a different line. So stop. Note that | |
5196 | we don't stop if we step into the middle of a different line. | |
5197 | That is said to make things like for (;;) statements work | |
5198 | better. */ | |
527159b7 | 5199 | if (debug_infrun) |
3e43a32a MS |
5200 | fprintf_unfiltered (gdb_stdlog, |
5201 | "infrun: stepped to a different line\n"); | |
16c381f0 | 5202 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5203 | print_end_stepping_range_reason (); |
488f131b JB |
5204 | stop_stepping (ecs); |
5205 | return; | |
5206 | } | |
c906108c | 5207 | |
488f131b | 5208 | /* We aren't done stepping. |
c906108c | 5209 | |
488f131b JB |
5210 | Optimize by setting the stepping range to the line. |
5211 | (We might not be in the original line, but if we entered a | |
5212 | new line in mid-statement, we continue stepping. This makes | |
5213 | things like for(;;) statements work better.) */ | |
c906108c | 5214 | |
16c381f0 JK |
5215 | ecs->event_thread->control.step_range_start = stop_pc_sal.pc; |
5216 | ecs->event_thread->control.step_range_end = stop_pc_sal.end; | |
edb3359d | 5217 | set_step_info (frame, stop_pc_sal); |
488f131b | 5218 | |
527159b7 | 5219 | if (debug_infrun) |
8a9de0e4 | 5220 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 5221 | keep_going (ecs); |
104c1213 JM |
5222 | } |
5223 | ||
b3444185 | 5224 | /* Is thread TP in the middle of single-stepping? */ |
104c1213 | 5225 | |
a289b8f6 | 5226 | static int |
b3444185 | 5227 | currently_stepping (struct thread_info *tp) |
a7212384 | 5228 | { |
8358c15c JK |
5229 | return ((tp->control.step_range_end |
5230 | && tp->control.step_resume_breakpoint == NULL) | |
5231 | || tp->control.trap_expected | |
8358c15c | 5232 | || bpstat_should_step ()); |
a7212384 UW |
5233 | } |
5234 | ||
b3444185 PA |
5235 | /* Returns true if any thread *but* the one passed in "data" is in the |
5236 | middle of stepping or of handling a "next". */ | |
a7212384 | 5237 | |
104c1213 | 5238 | static int |
b3444185 | 5239 | currently_stepping_or_nexting_callback (struct thread_info *tp, void *data) |
104c1213 | 5240 | { |
b3444185 PA |
5241 | if (tp == data) |
5242 | return 0; | |
5243 | ||
16c381f0 | 5244 | return (tp->control.step_range_end |
ede1849f | 5245 | || tp->control.trap_expected); |
104c1213 | 5246 | } |
c906108c | 5247 | |
b2175913 MS |
5248 | /* Inferior has stepped into a subroutine call with source code that |
5249 | we should not step over. Do step to the first line of code in | |
5250 | it. */ | |
c2c6d25f JM |
5251 | |
5252 | static void | |
568d6575 UW |
5253 | handle_step_into_function (struct gdbarch *gdbarch, |
5254 | struct execution_control_state *ecs) | |
c2c6d25f JM |
5255 | { |
5256 | struct symtab *s; | |
2afb61aa | 5257 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f | 5258 | |
7e324e48 GB |
5259 | fill_in_stop_func (gdbarch, ecs); |
5260 | ||
c2c6d25f JM |
5261 | s = find_pc_symtab (stop_pc); |
5262 | if (s && s->language != language_asm) | |
568d6575 | 5263 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 | 5264 | ecs->stop_func_start); |
c2c6d25f | 5265 | |
2afb61aa | 5266 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
5267 | /* Use the step_resume_break to step until the end of the prologue, |
5268 | even if that involves jumps (as it seems to on the vax under | |
5269 | 4.2). */ | |
5270 | /* If the prologue ends in the middle of a source line, continue to | |
5271 | the end of that source line (if it is still within the function). | |
5272 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
5273 | if (stop_func_sal.end |
5274 | && stop_func_sal.pc != ecs->stop_func_start | |
5275 | && stop_func_sal.end < ecs->stop_func_end) | |
5276 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 5277 | |
2dbd5e30 KB |
5278 | /* Architectures which require breakpoint adjustment might not be able |
5279 | to place a breakpoint at the computed address. If so, the test | |
5280 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
5281 | ecs->stop_func_start to an address at which a breakpoint may be | |
5282 | legitimately placed. | |
8fb3e588 | 5283 | |
2dbd5e30 KB |
5284 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
5285 | made, GDB will enter an infinite loop when stepping through | |
5286 | optimized code consisting of VLIW instructions which contain | |
5287 | subinstructions corresponding to different source lines. On | |
5288 | FR-V, it's not permitted to place a breakpoint on any but the | |
5289 | first subinstruction of a VLIW instruction. When a breakpoint is | |
5290 | set, GDB will adjust the breakpoint address to the beginning of | |
5291 | the VLIW instruction. Thus, we need to make the corresponding | |
5292 | adjustment here when computing the stop address. */ | |
8fb3e588 | 5293 | |
568d6575 | 5294 | if (gdbarch_adjust_breakpoint_address_p (gdbarch)) |
2dbd5e30 KB |
5295 | { |
5296 | ecs->stop_func_start | |
568d6575 | 5297 | = gdbarch_adjust_breakpoint_address (gdbarch, |
8fb3e588 | 5298 | ecs->stop_func_start); |
2dbd5e30 KB |
5299 | } |
5300 | ||
c2c6d25f JM |
5301 | if (ecs->stop_func_start == stop_pc) |
5302 | { | |
5303 | /* We are already there: stop now. */ | |
16c381f0 | 5304 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5305 | print_end_stepping_range_reason (); |
c2c6d25f JM |
5306 | stop_stepping (ecs); |
5307 | return; | |
5308 | } | |
5309 | else | |
5310 | { | |
5311 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 5312 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
5313 | sr_sal.pc = ecs->stop_func_start; |
5314 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
6c95b8df | 5315 | sr_sal.pspace = get_frame_program_space (get_current_frame ()); |
44cbf7b5 | 5316 | |
c2c6d25f | 5317 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
5318 | some machines the prologue is where the new fp value is |
5319 | established. */ | |
a6d9a66e | 5320 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id); |
c2c6d25f JM |
5321 | |
5322 | /* And make sure stepping stops right away then. */ | |
16c381f0 JK |
5323 | ecs->event_thread->control.step_range_end |
5324 | = ecs->event_thread->control.step_range_start; | |
c2c6d25f JM |
5325 | } |
5326 | keep_going (ecs); | |
5327 | } | |
d4f3574e | 5328 | |
b2175913 MS |
5329 | /* Inferior has stepped backward into a subroutine call with source |
5330 | code that we should not step over. Do step to the beginning of the | |
5331 | last line of code in it. */ | |
5332 | ||
5333 | static void | |
568d6575 UW |
5334 | handle_step_into_function_backward (struct gdbarch *gdbarch, |
5335 | struct execution_control_state *ecs) | |
b2175913 MS |
5336 | { |
5337 | struct symtab *s; | |
167e4384 | 5338 | struct symtab_and_line stop_func_sal; |
b2175913 | 5339 | |
7e324e48 GB |
5340 | fill_in_stop_func (gdbarch, ecs); |
5341 | ||
b2175913 MS |
5342 | s = find_pc_symtab (stop_pc); |
5343 | if (s && s->language != language_asm) | |
568d6575 | 5344 | ecs->stop_func_start = gdbarch_skip_prologue (gdbarch, |
b2175913 MS |
5345 | ecs->stop_func_start); |
5346 | ||
5347 | stop_func_sal = find_pc_line (stop_pc, 0); | |
5348 | ||
5349 | /* OK, we're just going to keep stepping here. */ | |
5350 | if (stop_func_sal.pc == stop_pc) | |
5351 | { | |
5352 | /* We're there already. Just stop stepping now. */ | |
16c381f0 | 5353 | ecs->event_thread->control.stop_step = 1; |
33d62d64 | 5354 | print_end_stepping_range_reason (); |
b2175913 MS |
5355 | stop_stepping (ecs); |
5356 | } | |
5357 | else | |
5358 | { | |
5359 | /* Else just reset the step range and keep going. | |
5360 | No step-resume breakpoint, they don't work for | |
5361 | epilogues, which can have multiple entry paths. */ | |
16c381f0 JK |
5362 | ecs->event_thread->control.step_range_start = stop_func_sal.pc; |
5363 | ecs->event_thread->control.step_range_end = stop_func_sal.end; | |
b2175913 MS |
5364 | keep_going (ecs); |
5365 | } | |
5366 | return; | |
5367 | } | |
5368 | ||
d3169d93 | 5369 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
5370 | This is used to both functions and to skip over code. */ |
5371 | ||
5372 | static void | |
2c03e5be PA |
5373 | insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch, |
5374 | struct symtab_and_line sr_sal, | |
5375 | struct frame_id sr_id, | |
5376 | enum bptype sr_type) | |
44cbf7b5 | 5377 | { |
611c83ae PA |
5378 | /* There should never be more than one step-resume or longjmp-resume |
5379 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 | 5380 | step_resume_breakpoint when one is already active. */ |
8358c15c | 5381 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
2c03e5be | 5382 | gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume); |
d3169d93 DJ |
5383 | |
5384 | if (debug_infrun) | |
5385 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5386 | "infrun: inserting step-resume breakpoint at %s\n", |
5387 | paddress (gdbarch, sr_sal.pc)); | |
d3169d93 | 5388 | |
8358c15c | 5389 | inferior_thread ()->control.step_resume_breakpoint |
2c03e5be PA |
5390 | = set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type); |
5391 | } | |
5392 | ||
9da8c2a0 | 5393 | void |
2c03e5be PA |
5394 | insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch, |
5395 | struct symtab_and_line sr_sal, | |
5396 | struct frame_id sr_id) | |
5397 | { | |
5398 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, | |
5399 | sr_sal, sr_id, | |
5400 | bp_step_resume); | |
44cbf7b5 | 5401 | } |
7ce450bd | 5402 | |
2c03e5be PA |
5403 | /* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc. |
5404 | This is used to skip a potential signal handler. | |
7ce450bd | 5405 | |
14e60db5 DJ |
5406 | This is called with the interrupted function's frame. The signal |
5407 | handler, when it returns, will resume the interrupted function at | |
5408 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
5409 | |
5410 | static void | |
2c03e5be | 5411 | insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
5412 | { |
5413 | struct symtab_and_line sr_sal; | |
a6d9a66e | 5414 | struct gdbarch *gdbarch; |
d303a6c7 | 5415 | |
f4c1edd8 | 5416 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
5417 | init_sal (&sr_sal); /* initialize to zeros */ |
5418 | ||
a6d9a66e | 5419 | gdbarch = get_frame_arch (return_frame); |
568d6575 | 5420 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame)); |
d303a6c7 | 5421 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5422 | sr_sal.pspace = get_frame_program_space (return_frame); |
d303a6c7 | 5423 | |
2c03e5be PA |
5424 | insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal, |
5425 | get_stack_frame_id (return_frame), | |
5426 | bp_hp_step_resume); | |
d303a6c7 AC |
5427 | } |
5428 | ||
2c03e5be PA |
5429 | /* Insert a "step-resume breakpoint" at the previous frame's PC. This |
5430 | is used to skip a function after stepping into it (for "next" or if | |
5431 | the called function has no debugging information). | |
14e60db5 DJ |
5432 | |
5433 | The current function has almost always been reached by single | |
5434 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
5435 | current function, and the breakpoint will be set at the caller's | |
5436 | resume address. | |
5437 | ||
5438 | This is a separate function rather than reusing | |
2c03e5be | 5439 | insert_hp_step_resume_breakpoint_at_frame in order to avoid |
14e60db5 | 5440 | get_prev_frame, which may stop prematurely (see the implementation |
c7ce8faa | 5441 | of frame_unwind_caller_id for an example). */ |
14e60db5 DJ |
5442 | |
5443 | static void | |
5444 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
5445 | { | |
5446 | struct symtab_and_line sr_sal; | |
a6d9a66e | 5447 | struct gdbarch *gdbarch; |
14e60db5 DJ |
5448 | |
5449 | /* We shouldn't have gotten here if we don't know where the call site | |
5450 | is. */ | |
c7ce8faa | 5451 | gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame))); |
14e60db5 DJ |
5452 | |
5453 | init_sal (&sr_sal); /* initialize to zeros */ | |
5454 | ||
a6d9a66e | 5455 | gdbarch = frame_unwind_caller_arch (next_frame); |
c7ce8faa DJ |
5456 | sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, |
5457 | frame_unwind_caller_pc (next_frame)); | |
14e60db5 | 5458 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
6c95b8df | 5459 | sr_sal.pspace = frame_unwind_program_space (next_frame); |
14e60db5 | 5460 | |
a6d9a66e | 5461 | insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, |
c7ce8faa | 5462 | frame_unwind_caller_id (next_frame)); |
14e60db5 DJ |
5463 | } |
5464 | ||
611c83ae PA |
5465 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
5466 | new breakpoint at the target of a jmp_buf. The handling of | |
5467 | longjmp-resume uses the same mechanisms used for handling | |
5468 | "step-resume" breakpoints. */ | |
5469 | ||
5470 | static void | |
a6d9a66e | 5471 | insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc) |
611c83ae PA |
5472 | { |
5473 | /* There should never be more than one step-resume or longjmp-resume | |
5474 | breakpoint per thread, so we should never be setting a new | |
5475 | longjmp_resume_breakpoint when one is already active. */ | |
8358c15c | 5476 | gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL); |
611c83ae PA |
5477 | |
5478 | if (debug_infrun) | |
5479 | fprintf_unfiltered (gdb_stdlog, | |
5af949e3 UW |
5480 | "infrun: inserting longjmp-resume breakpoint at %s\n", |
5481 | paddress (gdbarch, pc)); | |
611c83ae | 5482 | |
8358c15c | 5483 | inferior_thread ()->control.step_resume_breakpoint = |
a6d9a66e | 5484 | set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume); |
611c83ae PA |
5485 | } |
5486 | ||
186c406b TT |
5487 | /* Insert an exception resume breakpoint. TP is the thread throwing |
5488 | the exception. The block B is the block of the unwinder debug hook | |
5489 | function. FRAME is the frame corresponding to the call to this | |
5490 | function. SYM is the symbol of the function argument holding the | |
5491 | target PC of the exception. */ | |
5492 | ||
5493 | static void | |
5494 | insert_exception_resume_breakpoint (struct thread_info *tp, | |
5495 | struct block *b, | |
5496 | struct frame_info *frame, | |
5497 | struct symbol *sym) | |
5498 | { | |
5499 | struct gdb_exception e; | |
5500 | ||
5501 | /* We want to ignore errors here. */ | |
5502 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
5503 | { | |
5504 | struct symbol *vsym; | |
5505 | struct value *value; | |
5506 | CORE_ADDR handler; | |
5507 | struct breakpoint *bp; | |
5508 | ||
5509 | vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL); | |
5510 | value = read_var_value (vsym, frame); | |
5511 | /* If the value was optimized out, revert to the old behavior. */ | |
5512 | if (! value_optimized_out (value)) | |
5513 | { | |
5514 | handler = value_as_address (value); | |
5515 | ||
5516 | if (debug_infrun) | |
5517 | fprintf_unfiltered (gdb_stdlog, | |
5518 | "infrun: exception resume at %lx\n", | |
5519 | (unsigned long) handler); | |
5520 | ||
5521 | bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame), | |
5522 | handler, bp_exception_resume); | |
5523 | bp->thread = tp->num; | |
5524 | inferior_thread ()->control.exception_resume_breakpoint = bp; | |
5525 | } | |
5526 | } | |
5527 | } | |
5528 | ||
5529 | /* This is called when an exception has been intercepted. Check to | |
5530 | see whether the exception's destination is of interest, and if so, | |
5531 | set an exception resume breakpoint there. */ | |
5532 | ||
5533 | static void | |
5534 | check_exception_resume (struct execution_control_state *ecs, | |
5535 | struct frame_info *frame, struct symbol *func) | |
5536 | { | |
5537 | struct gdb_exception e; | |
5538 | ||
5539 | TRY_CATCH (e, RETURN_MASK_ERROR) | |
5540 | { | |
5541 | struct block *b; | |
5542 | struct dict_iterator iter; | |
5543 | struct symbol *sym; | |
5544 | int argno = 0; | |
5545 | ||
5546 | /* The exception breakpoint is a thread-specific breakpoint on | |
5547 | the unwinder's debug hook, declared as: | |
5548 | ||
5549 | void _Unwind_DebugHook (void *cfa, void *handler); | |
5550 | ||
5551 | The CFA argument indicates the frame to which control is | |
5552 | about to be transferred. HANDLER is the destination PC. | |
5553 | ||
5554 | We ignore the CFA and set a temporary breakpoint at HANDLER. | |
5555 | This is not extremely efficient but it avoids issues in gdb | |
5556 | with computing the DWARF CFA, and it also works even in weird | |
5557 | cases such as throwing an exception from inside a signal | |
5558 | handler. */ | |
5559 | ||
5560 | b = SYMBOL_BLOCK_VALUE (func); | |
5561 | ALL_BLOCK_SYMBOLS (b, iter, sym) | |
5562 | { | |
5563 | if (!SYMBOL_IS_ARGUMENT (sym)) | |
5564 | continue; | |
5565 | ||
5566 | if (argno == 0) | |
5567 | ++argno; | |
5568 | else | |
5569 | { | |
5570 | insert_exception_resume_breakpoint (ecs->event_thread, | |
5571 | b, frame, sym); | |
5572 | break; | |
5573 | } | |
5574 | } | |
5575 | } | |
5576 | } | |
5577 | ||
104c1213 JM |
5578 | static void |
5579 | stop_stepping (struct execution_control_state *ecs) | |
5580 | { | |
527159b7 | 5581 | if (debug_infrun) |
8a9de0e4 | 5582 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
527159b7 | 5583 | |
cd0fc7c3 SS |
5584 | /* Let callers know we don't want to wait for the inferior anymore. */ |
5585 | ecs->wait_some_more = 0; | |
5586 | } | |
5587 | ||
d4f3574e SS |
5588 | /* This function handles various cases where we need to continue |
5589 | waiting for the inferior. */ | |
1777feb0 | 5590 | /* (Used to be the keep_going: label in the old wait_for_inferior). */ |
d4f3574e SS |
5591 | |
5592 | static void | |
5593 | keep_going (struct execution_control_state *ecs) | |
5594 | { | |
c4dbc9af PA |
5595 | /* Make sure normal_stop is called if we get a QUIT handled before |
5596 | reaching resume. */ | |
5597 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); | |
5598 | ||
d4f3574e | 5599 | /* Save the pc before execution, to compare with pc after stop. */ |
fb14de7b UW |
5600 | ecs->event_thread->prev_pc |
5601 | = regcache_read_pc (get_thread_regcache (ecs->ptid)); | |
d4f3574e | 5602 | |
d4f3574e SS |
5603 | /* If we did not do break;, it means we should keep running the |
5604 | inferior and not return to debugger. */ | |
5605 | ||
16c381f0 JK |
5606 | if (ecs->event_thread->control.trap_expected |
5607 | && ecs->event_thread->suspend.stop_signal != TARGET_SIGNAL_TRAP) | |
d4f3574e SS |
5608 | { |
5609 | /* We took a signal (which we are supposed to pass through to | |
4e1c45ea PA |
5610 | the inferior, else we'd not get here) and we haven't yet |
5611 | gotten our trap. Simply continue. */ | |
c4dbc9af PA |
5612 | |
5613 | discard_cleanups (old_cleanups); | |
2020b7ab | 5614 | resume (currently_stepping (ecs->event_thread), |
16c381f0 | 5615 | ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
5616 | } |
5617 | else | |
5618 | { | |
5619 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
5620 | anyway (the user asked that this signal be passed to the |
5621 | child) | |
5622 | -- or -- | |
5623 | The signal was SIGTRAP, e.g. it was our signal, but we | |
5624 | decided we should resume from it. | |
d4f3574e | 5625 | |
c36b740a | 5626 | We're going to run this baby now! |
d4f3574e | 5627 | |
c36b740a VP |
5628 | Note that insert_breakpoints won't try to re-insert |
5629 | already inserted breakpoints. Therefore, we don't | |
5630 | care if breakpoints were already inserted, or not. */ | |
5631 | ||
4e1c45ea | 5632 | if (ecs->event_thread->stepping_over_breakpoint) |
45e8c884 | 5633 | { |
9f5a595d | 5634 | struct regcache *thread_regcache = get_thread_regcache (ecs->ptid); |
abbb1732 | 5635 | |
9f5a595d | 5636 | if (!use_displaced_stepping (get_regcache_arch (thread_regcache))) |
237fc4c9 PA |
5637 | /* Since we can't do a displaced step, we have to remove |
5638 | the breakpoint while we step it. To keep things | |
5639 | simple, we remove them all. */ | |
5640 | remove_breakpoints (); | |
45e8c884 VP |
5641 | } |
5642 | else | |
d4f3574e | 5643 | { |
e236ba44 | 5644 | struct gdb_exception e; |
abbb1732 | 5645 | |
569631c6 UW |
5646 | /* Stop stepping when inserting breakpoints |
5647 | has failed. */ | |
e236ba44 VP |
5648 | TRY_CATCH (e, RETURN_MASK_ERROR) |
5649 | { | |
5650 | insert_breakpoints (); | |
5651 | } | |
5652 | if (e.reason < 0) | |
d4f3574e | 5653 | { |
97bd5475 | 5654 | exception_print (gdb_stderr, e); |
d4f3574e SS |
5655 | stop_stepping (ecs); |
5656 | return; | |
5657 | } | |
d4f3574e SS |
5658 | } |
5659 | ||
16c381f0 JK |
5660 | ecs->event_thread->control.trap_expected |
5661 | = ecs->event_thread->stepping_over_breakpoint; | |
d4f3574e SS |
5662 | |
5663 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
5664 | specifies that such a signal should be delivered to the |
5665 | target program). | |
5666 | ||
5667 | Typically, this would occure when a user is debugging a | |
5668 | target monitor on a simulator: the target monitor sets a | |
5669 | breakpoint; the simulator encounters this break-point and | |
5670 | halts the simulation handing control to GDB; GDB, noteing | |
5671 | that the break-point isn't valid, returns control back to the | |
5672 | simulator; the simulator then delivers the hardware | |
1777feb0 | 5673 | equivalent of a SIGNAL_TRAP to the program being debugged. */ |
488f131b | 5674 | |
16c381f0 JK |
5675 | if (ecs->event_thread->suspend.stop_signal == TARGET_SIGNAL_TRAP |
5676 | && !signal_program[ecs->event_thread->suspend.stop_signal]) | |
5677 | ecs->event_thread->suspend.stop_signal = TARGET_SIGNAL_0; | |
d4f3574e | 5678 | |
c4dbc9af | 5679 | discard_cleanups (old_cleanups); |
2020b7ab | 5680 | resume (currently_stepping (ecs->event_thread), |
16c381f0 | 5681 | ecs->event_thread->suspend.stop_signal); |
d4f3574e SS |
5682 | } |
5683 | ||
488f131b | 5684 | prepare_to_wait (ecs); |
d4f3574e SS |
5685 | } |
5686 | ||
104c1213 JM |
5687 | /* This function normally comes after a resume, before |
5688 | handle_inferior_event exits. It takes care of any last bits of | |
5689 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 5690 | |
104c1213 JM |
5691 | static void |
5692 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 5693 | { |
527159b7 | 5694 | if (debug_infrun) |
8a9de0e4 | 5695 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 | 5696 | |
104c1213 JM |
5697 | /* This is the old end of the while loop. Let everybody know we |
5698 | want to wait for the inferior some more and get called again | |
5699 | soon. */ | |
5700 | ecs->wait_some_more = 1; | |
c906108c | 5701 | } |
11cf8741 | 5702 | |
33d62d64 JK |
5703 | /* Several print_*_reason functions to print why the inferior has stopped. |
5704 | We always print something when the inferior exits, or receives a signal. | |
5705 | The rest of the cases are dealt with later on in normal_stop and | |
5706 | print_it_typical. Ideally there should be a call to one of these | |
5707 | print_*_reason functions functions from handle_inferior_event each time | |
5708 | stop_stepping is called. */ | |
5709 | ||
5710 | /* Print why the inferior has stopped. | |
5711 | We are done with a step/next/si/ni command, print why the inferior has | |
5712 | stopped. For now print nothing. Print a message only if not in the middle | |
5713 | of doing a "step n" operation for n > 1. */ | |
5714 | ||
5715 | static void | |
5716 | print_end_stepping_range_reason (void) | |
5717 | { | |
16c381f0 JK |
5718 | if ((!inferior_thread ()->step_multi |
5719 | || !inferior_thread ()->control.stop_step) | |
79a45e25 PA |
5720 | && ui_out_is_mi_like_p (current_uiout)) |
5721 | ui_out_field_string (current_uiout, "reason", | |
33d62d64 JK |
5722 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); |
5723 | } | |
5724 | ||
5725 | /* The inferior was terminated by a signal, print why it stopped. */ | |
5726 | ||
11cf8741 | 5727 | static void |
33d62d64 | 5728 | print_signal_exited_reason (enum target_signal siggnal) |
11cf8741 | 5729 | { |
79a45e25 PA |
5730 | struct ui_out *uiout = current_uiout; |
5731 | ||
33d62d64 JK |
5732 | annotate_signalled (); |
5733 | if (ui_out_is_mi_like_p (uiout)) | |
5734 | ui_out_field_string | |
5735 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
5736 | ui_out_text (uiout, "\nProgram terminated with signal "); | |
5737 | annotate_signal_name (); | |
5738 | ui_out_field_string (uiout, "signal-name", | |
5739 | target_signal_to_name (siggnal)); | |
5740 | annotate_signal_name_end (); | |
5741 | ui_out_text (uiout, ", "); | |
5742 | annotate_signal_string (); | |
5743 | ui_out_field_string (uiout, "signal-meaning", | |
5744 | target_signal_to_string (siggnal)); | |
5745 | annotate_signal_string_end (); | |
5746 | ui_out_text (uiout, ".\n"); | |
5747 | ui_out_text (uiout, "The program no longer exists.\n"); | |
5748 | } | |
5749 | ||
5750 | /* The inferior program is finished, print why it stopped. */ | |
5751 | ||
5752 | static void | |
5753 | print_exited_reason (int exitstatus) | |
5754 | { | |
fda326dd TT |
5755 | struct inferior *inf = current_inferior (); |
5756 | const char *pidstr = target_pid_to_str (pid_to_ptid (inf->pid)); | |
79a45e25 | 5757 | struct ui_out *uiout = current_uiout; |
fda326dd | 5758 | |
33d62d64 JK |
5759 | annotate_exited (exitstatus); |
5760 | if (exitstatus) | |
5761 | { | |
5762 | if (ui_out_is_mi_like_p (uiout)) | |
5763 | ui_out_field_string (uiout, "reason", | |
5764 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
fda326dd TT |
5765 | ui_out_text (uiout, "[Inferior "); |
5766 | ui_out_text (uiout, plongest (inf->num)); | |
5767 | ui_out_text (uiout, " ("); | |
5768 | ui_out_text (uiout, pidstr); | |
5769 | ui_out_text (uiout, ") exited with code "); | |
33d62d64 | 5770 | ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) exitstatus); |
fda326dd | 5771 | ui_out_text (uiout, "]\n"); |
33d62d64 JK |
5772 | } |
5773 | else | |
11cf8741 | 5774 | { |
9dc5e2a9 | 5775 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f | 5776 | ui_out_field_string |
33d62d64 | 5777 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); |
fda326dd TT |
5778 | ui_out_text (uiout, "[Inferior "); |
5779 | ui_out_text (uiout, plongest (inf->num)); | |
5780 | ui_out_text (uiout, " ("); | |
5781 | ui_out_text (uiout, pidstr); | |
5782 | ui_out_text (uiout, ") exited normally]\n"); | |
33d62d64 JK |
5783 | } |
5784 | /* Support the --return-child-result option. */ | |
5785 | return_child_result_value = exitstatus; | |
5786 | } | |
5787 | ||
5788 | /* Signal received, print why the inferior has stopped. The signal table | |
1777feb0 | 5789 | tells us to print about it. */ |
33d62d64 JK |
5790 | |
5791 | static void | |
5792 | print_signal_received_reason (enum target_signal siggnal) | |
5793 | { | |
79a45e25 PA |
5794 | struct ui_out *uiout = current_uiout; |
5795 | ||
33d62d64 JK |
5796 | annotate_signal (); |
5797 | ||
5798 | if (siggnal == TARGET_SIGNAL_0 && !ui_out_is_mi_like_p (uiout)) | |
5799 | { | |
5800 | struct thread_info *t = inferior_thread (); | |
5801 | ||
5802 | ui_out_text (uiout, "\n["); | |
5803 | ui_out_field_string (uiout, "thread-name", | |
5804 | target_pid_to_str (t->ptid)); | |
5805 | ui_out_field_fmt (uiout, "thread-id", "] #%d", t->num); | |
5806 | ui_out_text (uiout, " stopped"); | |
5807 | } | |
5808 | else | |
5809 | { | |
5810 | ui_out_text (uiout, "\nProgram received signal "); | |
8b93c638 | 5811 | annotate_signal_name (); |
33d62d64 JK |
5812 | if (ui_out_is_mi_like_p (uiout)) |
5813 | ui_out_field_string | |
5814 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b | 5815 | ui_out_field_string (uiout, "signal-name", |
33d62d64 | 5816 | target_signal_to_name (siggnal)); |
8b93c638 JM |
5817 | annotate_signal_name_end (); |
5818 | ui_out_text (uiout, ", "); | |
5819 | annotate_signal_string (); | |
488f131b | 5820 | ui_out_field_string (uiout, "signal-meaning", |
33d62d64 | 5821 | target_signal_to_string (siggnal)); |
8b93c638 | 5822 | annotate_signal_string_end (); |
33d62d64 JK |
5823 | } |
5824 | ui_out_text (uiout, ".\n"); | |
5825 | } | |
252fbfc8 | 5826 | |
33d62d64 JK |
5827 | /* Reverse execution: target ran out of history info, print why the inferior |
5828 | has stopped. */ | |
252fbfc8 | 5829 | |
33d62d64 JK |
5830 | static void |
5831 | print_no_history_reason (void) | |
5832 | { | |
79a45e25 | 5833 | ui_out_text (current_uiout, "\nNo more reverse-execution history.\n"); |
11cf8741 | 5834 | } |
43ff13b4 | 5835 | |
c906108c SS |
5836 | /* Here to return control to GDB when the inferior stops for real. |
5837 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
5838 | ||
5839 | STOP_PRINT_FRAME nonzero means print the executing frame | |
5840 | (pc, function, args, file, line number and line text). | |
5841 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
5842 | attempting to insert breakpoints. */ | |
5843 | ||
5844 | void | |
96baa820 | 5845 | normal_stop (void) |
c906108c | 5846 | { |
73b65bb0 DJ |
5847 | struct target_waitstatus last; |
5848 | ptid_t last_ptid; | |
29f49a6a | 5849 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
73b65bb0 DJ |
5850 | |
5851 | get_last_target_status (&last_ptid, &last); | |
5852 | ||
29f49a6a PA |
5853 | /* If an exception is thrown from this point on, make sure to |
5854 | propagate GDB's knowledge of the executing state to the | |
5855 | frontend/user running state. A QUIT is an easy exception to see | |
5856 | here, so do this before any filtered output. */ | |
c35b1492 PA |
5857 | if (!non_stop) |
5858 | make_cleanup (finish_thread_state_cleanup, &minus_one_ptid); | |
5859 | else if (last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
5860 | && last.kind != TARGET_WAITKIND_EXITED |
5861 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c35b1492 | 5862 | make_cleanup (finish_thread_state_cleanup, &inferior_ptid); |
29f49a6a | 5863 | |
4f8d22e3 PA |
5864 | /* In non-stop mode, we don't want GDB to switch threads behind the |
5865 | user's back, to avoid races where the user is typing a command to | |
5866 | apply to thread x, but GDB switches to thread y before the user | |
5867 | finishes entering the command. */ | |
5868 | ||
c906108c SS |
5869 | /* As with the notification of thread events, we want to delay |
5870 | notifying the user that we've switched thread context until | |
5871 | the inferior actually stops. | |
5872 | ||
73b65bb0 DJ |
5873 | There's no point in saying anything if the inferior has exited. |
5874 | Note that SIGNALLED here means "exited with a signal", not | |
5875 | "received a signal". */ | |
4f8d22e3 PA |
5876 | if (!non_stop |
5877 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
5878 | && target_has_execution |
5879 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
0e5bf2a8 PA |
5880 | && last.kind != TARGET_WAITKIND_EXITED |
5881 | && last.kind != TARGET_WAITKIND_NO_RESUMED) | |
c906108c SS |
5882 | { |
5883 | target_terminal_ours_for_output (); | |
a3f17187 | 5884 | printf_filtered (_("[Switching to %s]\n"), |
c95310c6 | 5885 | target_pid_to_str (inferior_ptid)); |
b8fa951a | 5886 | annotate_thread_changed (); |
39f77062 | 5887 | previous_inferior_ptid = inferior_ptid; |
c906108c | 5888 | } |
c906108c | 5889 | |
0e5bf2a8 PA |
5890 | if (last.kind == TARGET_WAITKIND_NO_RESUMED) |
5891 | { | |
5892 | gdb_assert (sync_execution || !target_can_async_p ()); | |
5893 | ||
5894 | target_terminal_ours_for_output (); | |
5895 | printf_filtered (_("No unwaited-for children left.\n")); | |
5896 | } | |
5897 | ||
74960c60 | 5898 | if (!breakpoints_always_inserted_mode () && target_has_execution) |
c906108c SS |
5899 | { |
5900 | if (remove_breakpoints ()) | |
5901 | { | |
5902 | target_terminal_ours_for_output (); | |
3e43a32a MS |
5903 | printf_filtered (_("Cannot remove breakpoints because " |
5904 | "program is no longer writable.\nFurther " | |
5905 | "execution is probably impossible.\n")); | |
c906108c SS |
5906 | } |
5907 | } | |
c906108c | 5908 | |
c906108c SS |
5909 | /* If an auto-display called a function and that got a signal, |
5910 | delete that auto-display to avoid an infinite recursion. */ | |
5911 | ||
5912 | if (stopped_by_random_signal) | |
5913 | disable_current_display (); | |
5914 | ||
5915 | /* Don't print a message if in the middle of doing a "step n" | |
5916 | operation for n > 1 */ | |
af679fd0 PA |
5917 | if (target_has_execution |
5918 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
5919 | && last.kind != TARGET_WAITKIND_EXITED | |
5920 | && inferior_thread ()->step_multi | |
16c381f0 | 5921 | && inferior_thread ()->control.stop_step) |
c906108c SS |
5922 | goto done; |
5923 | ||
5924 | target_terminal_ours (); | |
0f641c01 | 5925 | async_enable_stdin (); |
c906108c | 5926 | |
7abfe014 DJ |
5927 | /* Set the current source location. This will also happen if we |
5928 | display the frame below, but the current SAL will be incorrect | |
5929 | during a user hook-stop function. */ | |
d729566a | 5930 | if (has_stack_frames () && !stop_stack_dummy) |
7abfe014 DJ |
5931 | set_current_sal_from_frame (get_current_frame (), 1); |
5932 | ||
dd7e2d2b PA |
5933 | /* Let the user/frontend see the threads as stopped. */ |
5934 | do_cleanups (old_chain); | |
5935 | ||
5936 | /* Look up the hook_stop and run it (CLI internally handles problem | |
5937 | of stop_command's pre-hook not existing). */ | |
5938 | if (stop_command) | |
5939 | catch_errors (hook_stop_stub, stop_command, | |
5940 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
5941 | ||
d729566a | 5942 | if (!has_stack_frames ()) |
d51fd4c8 | 5943 | goto done; |
c906108c | 5944 | |
32400beb PA |
5945 | if (last.kind == TARGET_WAITKIND_SIGNALLED |
5946 | || last.kind == TARGET_WAITKIND_EXITED) | |
5947 | goto done; | |
5948 | ||
c906108c SS |
5949 | /* Select innermost stack frame - i.e., current frame is frame 0, |
5950 | and current location is based on that. | |
5951 | Don't do this on return from a stack dummy routine, | |
1777feb0 | 5952 | or if the program has exited. */ |
c906108c SS |
5953 | |
5954 | if (!stop_stack_dummy) | |
5955 | { | |
0f7d239c | 5956 | select_frame (get_current_frame ()); |
c906108c SS |
5957 | |
5958 | /* Print current location without a level number, if | |
c5aa993b JM |
5959 | we have changed functions or hit a breakpoint. |
5960 | Print source line if we have one. | |
5961 | bpstat_print() contains the logic deciding in detail | |
1777feb0 | 5962 | what to print, based on the event(s) that just occurred. */ |
c906108c | 5963 | |
d01a8610 AS |
5964 | /* If --batch-silent is enabled then there's no need to print the current |
5965 | source location, and to try risks causing an error message about | |
5966 | missing source files. */ | |
5967 | if (stop_print_frame && !batch_silent) | |
c906108c SS |
5968 | { |
5969 | int bpstat_ret; | |
5970 | int source_flag; | |
917317f4 | 5971 | int do_frame_printing = 1; |
347bddb7 | 5972 | struct thread_info *tp = inferior_thread (); |
c906108c | 5973 | |
36dfb11c | 5974 | bpstat_ret = bpstat_print (tp->control.stop_bpstat, last.kind); |
917317f4 JM |
5975 | switch (bpstat_ret) |
5976 | { | |
5977 | case PRINT_UNKNOWN: | |
aa0cd9c1 | 5978 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
5979 | (or should) carry around the function and does (or |
5980 | should) use that when doing a frame comparison. */ | |
16c381f0 JK |
5981 | if (tp->control.stop_step |
5982 | && frame_id_eq (tp->control.step_frame_id, | |
aa0cd9c1 | 5983 | get_frame_id (get_current_frame ())) |
917317f4 | 5984 | && step_start_function == find_pc_function (stop_pc)) |
1777feb0 MS |
5985 | source_flag = SRC_LINE; /* Finished step, just |
5986 | print source line. */ | |
917317f4 | 5987 | else |
1777feb0 MS |
5988 | source_flag = SRC_AND_LOC; /* Print location and |
5989 | source line. */ | |
917317f4 JM |
5990 | break; |
5991 | case PRINT_SRC_AND_LOC: | |
1777feb0 MS |
5992 | source_flag = SRC_AND_LOC; /* Print location and |
5993 | source line. */ | |
917317f4 JM |
5994 | break; |
5995 | case PRINT_SRC_ONLY: | |
c5394b80 | 5996 | source_flag = SRC_LINE; |
917317f4 JM |
5997 | break; |
5998 | case PRINT_NOTHING: | |
488f131b | 5999 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
6000 | do_frame_printing = 0; |
6001 | break; | |
6002 | default: | |
e2e0b3e5 | 6003 | internal_error (__FILE__, __LINE__, _("Unknown value.")); |
917317f4 | 6004 | } |
c906108c SS |
6005 | |
6006 | /* The behavior of this routine with respect to the source | |
6007 | flag is: | |
c5394b80 JM |
6008 | SRC_LINE: Print only source line |
6009 | LOCATION: Print only location | |
1777feb0 | 6010 | SRC_AND_LOC: Print location and source line. */ |
917317f4 | 6011 | if (do_frame_printing) |
b04f3ab4 | 6012 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
6013 | |
6014 | /* Display the auto-display expressions. */ | |
6015 | do_displays (); | |
6016 | } | |
6017 | } | |
6018 | ||
6019 | /* Save the function value return registers, if we care. | |
6020 | We might be about to restore their previous contents. */ | |
9da8c2a0 PA |
6021 | if (inferior_thread ()->control.proceed_to_finish |
6022 | && execution_direction != EXEC_REVERSE) | |
d5c31457 UW |
6023 | { |
6024 | /* This should not be necessary. */ | |
6025 | if (stop_registers) | |
6026 | regcache_xfree (stop_registers); | |
6027 | ||
6028 | /* NB: The copy goes through to the target picking up the value of | |
6029 | all the registers. */ | |
6030 | stop_registers = regcache_dup (get_current_regcache ()); | |
6031 | } | |
c906108c | 6032 | |
aa7d318d | 6033 | if (stop_stack_dummy == STOP_STACK_DUMMY) |
c906108c | 6034 | { |
b89667eb DE |
6035 | /* Pop the empty frame that contains the stack dummy. |
6036 | This also restores inferior state prior to the call | |
16c381f0 | 6037 | (struct infcall_suspend_state). */ |
b89667eb | 6038 | struct frame_info *frame = get_current_frame (); |
abbb1732 | 6039 | |
b89667eb DE |
6040 | gdb_assert (get_frame_type (frame) == DUMMY_FRAME); |
6041 | frame_pop (frame); | |
3e43a32a MS |
6042 | /* frame_pop() calls reinit_frame_cache as the last thing it |
6043 | does which means there's currently no selected frame. We | |
6044 | don't need to re-establish a selected frame if the dummy call | |
6045 | returns normally, that will be done by | |
6046 | restore_infcall_control_state. However, we do have to handle | |
6047 | the case where the dummy call is returning after being | |
6048 | stopped (e.g. the dummy call previously hit a breakpoint). | |
6049 | We can't know which case we have so just always re-establish | |
6050 | a selected frame here. */ | |
0f7d239c | 6051 | select_frame (get_current_frame ()); |
c906108c SS |
6052 | } |
6053 | ||
c906108c SS |
6054 | done: |
6055 | annotate_stopped (); | |
41d2bdb4 PA |
6056 | |
6057 | /* Suppress the stop observer if we're in the middle of: | |
6058 | ||
6059 | - a step n (n > 1), as there still more steps to be done. | |
6060 | ||
6061 | - a "finish" command, as the observer will be called in | |
6062 | finish_command_continuation, so it can include the inferior | |
6063 | function's return value. | |
6064 | ||
6065 | - calling an inferior function, as we pretend we inferior didn't | |
6066 | run at all. The return value of the call is handled by the | |
6067 | expression evaluator, through call_function_by_hand. */ | |
6068 | ||
6069 | if (!target_has_execution | |
6070 | || last.kind == TARGET_WAITKIND_SIGNALLED | |
6071 | || last.kind == TARGET_WAITKIND_EXITED | |
0e5bf2a8 | 6072 | || last.kind == TARGET_WAITKIND_NO_RESUMED |
41d2bdb4 | 6073 | || (!inferior_thread ()->step_multi |
16c381f0 JK |
6074 | && !(inferior_thread ()->control.stop_bpstat |
6075 | && inferior_thread ()->control.proceed_to_finish) | |
6076 | && !inferior_thread ()->control.in_infcall)) | |
347bddb7 PA |
6077 | { |
6078 | if (!ptid_equal (inferior_ptid, null_ptid)) | |
16c381f0 | 6079 | observer_notify_normal_stop (inferior_thread ()->control.stop_bpstat, |
1d33d6ba | 6080 | stop_print_frame); |
347bddb7 | 6081 | else |
1d33d6ba | 6082 | observer_notify_normal_stop (NULL, stop_print_frame); |
347bddb7 | 6083 | } |
347bddb7 | 6084 | |
48844aa6 PA |
6085 | if (target_has_execution) |
6086 | { | |
6087 | if (last.kind != TARGET_WAITKIND_SIGNALLED | |
6088 | && last.kind != TARGET_WAITKIND_EXITED) | |
6089 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
6090 | Delete any breakpoint that is to be deleted at the next stop. */ | |
16c381f0 | 6091 | breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat); |
94cc34af | 6092 | } |
6c95b8df PA |
6093 | |
6094 | /* Try to get rid of automatically added inferiors that are no | |
6095 | longer needed. Keeping those around slows down things linearly. | |
6096 | Note that this never removes the current inferior. */ | |
6097 | prune_inferiors (); | |
c906108c SS |
6098 | } |
6099 | ||
6100 | static int | |
96baa820 | 6101 | hook_stop_stub (void *cmd) |
c906108c | 6102 | { |
5913bcb0 | 6103 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
6104 | return (0); |
6105 | } | |
6106 | \f | |
c5aa993b | 6107 | int |
96baa820 | 6108 | signal_stop_state (int signo) |
c906108c | 6109 | { |
d6b48e9c | 6110 | return signal_stop[signo]; |
c906108c SS |
6111 | } |
6112 | ||
c5aa993b | 6113 | int |
96baa820 | 6114 | signal_print_state (int signo) |
c906108c SS |
6115 | { |
6116 | return signal_print[signo]; | |
6117 | } | |
6118 | ||
c5aa993b | 6119 | int |
96baa820 | 6120 | signal_pass_state (int signo) |
c906108c SS |
6121 | { |
6122 | return signal_program[signo]; | |
6123 | } | |
6124 | ||
2455069d UW |
6125 | static void |
6126 | signal_cache_update (int signo) | |
6127 | { | |
6128 | if (signo == -1) | |
6129 | { | |
6130 | for (signo = 0; signo < (int) TARGET_SIGNAL_LAST; signo++) | |
6131 | signal_cache_update (signo); | |
6132 | ||
6133 | return; | |
6134 | } | |
6135 | ||
6136 | signal_pass[signo] = (signal_stop[signo] == 0 | |
6137 | && signal_print[signo] == 0 | |
6138 | && signal_program[signo] == 1); | |
6139 | } | |
6140 | ||
488f131b | 6141 | int |
7bda5e4a | 6142 | signal_stop_update (int signo, int state) |
d4f3574e SS |
6143 | { |
6144 | int ret = signal_stop[signo]; | |
abbb1732 | 6145 | |
d4f3574e | 6146 | signal_stop[signo] = state; |
2455069d | 6147 | signal_cache_update (signo); |
d4f3574e SS |
6148 | return ret; |
6149 | } | |
6150 | ||
488f131b | 6151 | int |
7bda5e4a | 6152 | signal_print_update (int signo, int state) |
d4f3574e SS |
6153 | { |
6154 | int ret = signal_print[signo]; | |
abbb1732 | 6155 | |
d4f3574e | 6156 | signal_print[signo] = state; |
2455069d | 6157 | signal_cache_update (signo); |
d4f3574e SS |
6158 | return ret; |
6159 | } | |
6160 | ||
488f131b | 6161 | int |
7bda5e4a | 6162 | signal_pass_update (int signo, int state) |
d4f3574e SS |
6163 | { |
6164 | int ret = signal_program[signo]; | |
abbb1732 | 6165 | |
d4f3574e | 6166 | signal_program[signo] = state; |
2455069d | 6167 | signal_cache_update (signo); |
d4f3574e SS |
6168 | return ret; |
6169 | } | |
6170 | ||
c906108c | 6171 | static void |
96baa820 | 6172 | sig_print_header (void) |
c906108c | 6173 | { |
3e43a32a MS |
6174 | printf_filtered (_("Signal Stop\tPrint\tPass " |
6175 | "to program\tDescription\n")); | |
c906108c SS |
6176 | } |
6177 | ||
6178 | static void | |
96baa820 | 6179 | sig_print_info (enum target_signal oursig) |
c906108c | 6180 | { |
54363045 | 6181 | const char *name = target_signal_to_name (oursig); |
c906108c | 6182 | int name_padding = 13 - strlen (name); |
96baa820 | 6183 | |
c906108c SS |
6184 | if (name_padding <= 0) |
6185 | name_padding = 0; | |
6186 | ||
6187 | printf_filtered ("%s", name); | |
488f131b | 6188 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
6189 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
6190 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
6191 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
6192 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
6193 | } | |
6194 | ||
6195 | /* Specify how various signals in the inferior should be handled. */ | |
6196 | ||
6197 | static void | |
96baa820 | 6198 | handle_command (char *args, int from_tty) |
c906108c SS |
6199 | { |
6200 | char **argv; | |
6201 | int digits, wordlen; | |
6202 | int sigfirst, signum, siglast; | |
6203 | enum target_signal oursig; | |
6204 | int allsigs; | |
6205 | int nsigs; | |
6206 | unsigned char *sigs; | |
6207 | struct cleanup *old_chain; | |
6208 | ||
6209 | if (args == NULL) | |
6210 | { | |
e2e0b3e5 | 6211 | error_no_arg (_("signal to handle")); |
c906108c SS |
6212 | } |
6213 | ||
1777feb0 | 6214 | /* Allocate and zero an array of flags for which signals to handle. */ |
c906108c SS |
6215 | |
6216 | nsigs = (int) TARGET_SIGNAL_LAST; | |
6217 | sigs = (unsigned char *) alloca (nsigs); | |
6218 | memset (sigs, 0, nsigs); | |
6219 | ||
1777feb0 | 6220 | /* Break the command line up into args. */ |
c906108c | 6221 | |
d1a41061 | 6222 | argv = gdb_buildargv (args); |
7a292a7a | 6223 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
6224 | |
6225 | /* Walk through the args, looking for signal oursigs, signal names, and | |
6226 | actions. Signal numbers and signal names may be interspersed with | |
6227 | actions, with the actions being performed for all signals cumulatively | |
1777feb0 | 6228 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ |
c906108c SS |
6229 | |
6230 | while (*argv != NULL) | |
6231 | { | |
6232 | wordlen = strlen (*argv); | |
6233 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
6234 | {; | |
6235 | } | |
6236 | allsigs = 0; | |
6237 | sigfirst = siglast = -1; | |
6238 | ||
6239 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
6240 | { | |
6241 | /* Apply action to all signals except those used by the | |
1777feb0 | 6242 | debugger. Silently skip those. */ |
c906108c SS |
6243 | allsigs = 1; |
6244 | sigfirst = 0; | |
6245 | siglast = nsigs - 1; | |
6246 | } | |
6247 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
6248 | { | |
6249 | SET_SIGS (nsigs, sigs, signal_stop); | |
6250 | SET_SIGS (nsigs, sigs, signal_print); | |
6251 | } | |
6252 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
6253 | { | |
6254 | UNSET_SIGS (nsigs, sigs, signal_program); | |
6255 | } | |
6256 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
6257 | { | |
6258 | SET_SIGS (nsigs, sigs, signal_print); | |
6259 | } | |
6260 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
6261 | { | |
6262 | SET_SIGS (nsigs, sigs, signal_program); | |
6263 | } | |
6264 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
6265 | { | |
6266 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
6267 | } | |
6268 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
6269 | { | |
6270 | SET_SIGS (nsigs, sigs, signal_program); | |
6271 | } | |
6272 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
6273 | { | |
6274 | UNSET_SIGS (nsigs, sigs, signal_print); | |
6275 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
6276 | } | |
6277 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
6278 | { | |
6279 | UNSET_SIGS (nsigs, sigs, signal_program); | |
6280 | } | |
6281 | else if (digits > 0) | |
6282 | { | |
6283 | /* It is numeric. The numeric signal refers to our own | |
6284 | internal signal numbering from target.h, not to host/target | |
6285 | signal number. This is a feature; users really should be | |
6286 | using symbolic names anyway, and the common ones like | |
6287 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
6288 | ||
6289 | sigfirst = siglast = (int) | |
6290 | target_signal_from_command (atoi (*argv)); | |
6291 | if ((*argv)[digits] == '-') | |
6292 | { | |
6293 | siglast = (int) | |
6294 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
6295 | } | |
6296 | if (sigfirst > siglast) | |
6297 | { | |
1777feb0 | 6298 | /* Bet he didn't figure we'd think of this case... */ |
c906108c SS |
6299 | signum = sigfirst; |
6300 | sigfirst = siglast; | |
6301 | siglast = signum; | |
6302 | } | |
6303 | } | |
6304 | else | |
6305 | { | |
6306 | oursig = target_signal_from_name (*argv); | |
6307 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
6308 | { | |
6309 | sigfirst = siglast = (int) oursig; | |
6310 | } | |
6311 | else | |
6312 | { | |
6313 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 6314 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
6315 | } |
6316 | } | |
6317 | ||
6318 | /* If any signal numbers or symbol names were found, set flags for | |
1777feb0 | 6319 | which signals to apply actions to. */ |
c906108c SS |
6320 | |
6321 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
6322 | { | |
6323 | switch ((enum target_signal) signum) | |
6324 | { | |
6325 | case TARGET_SIGNAL_TRAP: | |
6326 | case TARGET_SIGNAL_INT: | |
6327 | if (!allsigs && !sigs[signum]) | |
6328 | { | |
9e2f0ad4 | 6329 | if (query (_("%s is used by the debugger.\n\ |
3e43a32a MS |
6330 | Are you sure you want to change it? "), |
6331 | target_signal_to_name ((enum target_signal) signum))) | |
c906108c SS |
6332 | { |
6333 | sigs[signum] = 1; | |
6334 | } | |
6335 | else | |
6336 | { | |
a3f17187 | 6337 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
6338 | gdb_flush (gdb_stdout); |
6339 | } | |
6340 | } | |
6341 | break; | |
6342 | case TARGET_SIGNAL_0: | |
6343 | case TARGET_SIGNAL_DEFAULT: | |
6344 | case TARGET_SIGNAL_UNKNOWN: | |
6345 | /* Make sure that "all" doesn't print these. */ | |
6346 | break; | |
6347 | default: | |
6348 | sigs[signum] = 1; | |
6349 | break; | |
6350 | } | |
6351 | } | |
6352 | ||
6353 | argv++; | |
6354 | } | |
6355 | ||
3a031f65 PA |
6356 | for (signum = 0; signum < nsigs; signum++) |
6357 | if (sigs[signum]) | |
6358 | { | |
2455069d UW |
6359 | signal_cache_update (-1); |
6360 | target_pass_signals ((int) TARGET_SIGNAL_LAST, signal_pass); | |
c906108c | 6361 | |
3a031f65 PA |
6362 | if (from_tty) |
6363 | { | |
6364 | /* Show the results. */ | |
6365 | sig_print_header (); | |
6366 | for (; signum < nsigs; signum++) | |
6367 | if (sigs[signum]) | |
6368 | sig_print_info (signum); | |
6369 | } | |
6370 | ||
6371 | break; | |
6372 | } | |
c906108c SS |
6373 | |
6374 | do_cleanups (old_chain); | |
6375 | } | |
6376 | ||
6377 | static void | |
96baa820 | 6378 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
6379 | { |
6380 | char **argv; | |
6381 | struct cleanup *old_chain; | |
6382 | ||
d1a41061 PP |
6383 | if (args == NULL) |
6384 | error_no_arg (_("xdb command")); | |
6385 | ||
1777feb0 | 6386 | /* Break the command line up into args. */ |
c906108c | 6387 | |
d1a41061 | 6388 | argv = gdb_buildargv (args); |
7a292a7a | 6389 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
6390 | if (argv[1] != (char *) NULL) |
6391 | { | |
6392 | char *argBuf; | |
6393 | int bufLen; | |
6394 | ||
6395 | bufLen = strlen (argv[0]) + 20; | |
6396 | argBuf = (char *) xmalloc (bufLen); | |
6397 | if (argBuf) | |
6398 | { | |
6399 | int validFlag = 1; | |
6400 | enum target_signal oursig; | |
6401 | ||
6402 | oursig = target_signal_from_name (argv[0]); | |
6403 | memset (argBuf, 0, bufLen); | |
6404 | if (strcmp (argv[1], "Q") == 0) | |
6405 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
6406 | else | |
6407 | { | |
6408 | if (strcmp (argv[1], "s") == 0) | |
6409 | { | |
6410 | if (!signal_stop[oursig]) | |
6411 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
6412 | else | |
6413 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
6414 | } | |
6415 | else if (strcmp (argv[1], "i") == 0) | |
6416 | { | |
6417 | if (!signal_program[oursig]) | |
6418 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
6419 | else | |
6420 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
6421 | } | |
6422 | else if (strcmp (argv[1], "r") == 0) | |
6423 | { | |
6424 | if (!signal_print[oursig]) | |
6425 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
6426 | else | |
6427 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
6428 | } | |
6429 | else | |
6430 | validFlag = 0; | |
6431 | } | |
6432 | if (validFlag) | |
6433 | handle_command (argBuf, from_tty); | |
6434 | else | |
a3f17187 | 6435 | printf_filtered (_("Invalid signal handling flag.\n")); |
c906108c | 6436 | if (argBuf) |
b8c9b27d | 6437 | xfree (argBuf); |
c906108c SS |
6438 | } |
6439 | } | |
6440 | do_cleanups (old_chain); | |
6441 | } | |
6442 | ||
6443 | /* Print current contents of the tables set by the handle command. | |
6444 | It is possible we should just be printing signals actually used | |
6445 | by the current target (but for things to work right when switching | |
6446 | targets, all signals should be in the signal tables). */ | |
6447 | ||
6448 | static void | |
96baa820 | 6449 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
6450 | { |
6451 | enum target_signal oursig; | |
abbb1732 | 6452 | |
c906108c SS |
6453 | sig_print_header (); |
6454 | ||
6455 | if (signum_exp) | |
6456 | { | |
6457 | /* First see if this is a symbol name. */ | |
6458 | oursig = target_signal_from_name (signum_exp); | |
6459 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
6460 | { | |
6461 | /* No, try numeric. */ | |
6462 | oursig = | |
bb518678 | 6463 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
6464 | } |
6465 | sig_print_info (oursig); | |
6466 | return; | |
6467 | } | |
6468 | ||
6469 | printf_filtered ("\n"); | |
6470 | /* These ugly casts brought to you by the native VAX compiler. */ | |
6471 | for (oursig = TARGET_SIGNAL_FIRST; | |
6472 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
6473 | oursig = (enum target_signal) ((int) oursig + 1)) | |
6474 | { | |
6475 | QUIT; | |
6476 | ||
6477 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 6478 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
6479 | sig_print_info (oursig); |
6480 | } | |
6481 | ||
3e43a32a MS |
6482 | printf_filtered (_("\nUse the \"handle\" command " |
6483 | "to change these tables.\n")); | |
c906108c | 6484 | } |
4aa995e1 | 6485 | |
c709acd1 PA |
6486 | /* Check if it makes sense to read $_siginfo from the current thread |
6487 | at this point. If not, throw an error. */ | |
6488 | ||
6489 | static void | |
6490 | validate_siginfo_access (void) | |
6491 | { | |
6492 | /* No current inferior, no siginfo. */ | |
6493 | if (ptid_equal (inferior_ptid, null_ptid)) | |
6494 | error (_("No thread selected.")); | |
6495 | ||
6496 | /* Don't try to read from a dead thread. */ | |
6497 | if (is_exited (inferior_ptid)) | |
6498 | error (_("The current thread has terminated")); | |
6499 | ||
6500 | /* ... or from a spinning thread. */ | |
6501 | if (is_running (inferior_ptid)) | |
6502 | error (_("Selected thread is running.")); | |
6503 | } | |
6504 | ||
4aa995e1 PA |
6505 | /* The $_siginfo convenience variable is a bit special. We don't know |
6506 | for sure the type of the value until we actually have a chance to | |
7a9dd1b2 | 6507 | fetch the data. The type can change depending on gdbarch, so it is |
4aa995e1 PA |
6508 | also dependent on which thread you have selected. |
6509 | ||
6510 | 1. making $_siginfo be an internalvar that creates a new value on | |
6511 | access. | |
6512 | ||
6513 | 2. making the value of $_siginfo be an lval_computed value. */ | |
6514 | ||
6515 | /* This function implements the lval_computed support for reading a | |
6516 | $_siginfo value. */ | |
6517 | ||
6518 | static void | |
6519 | siginfo_value_read (struct value *v) | |
6520 | { | |
6521 | LONGEST transferred; | |
6522 | ||
c709acd1 PA |
6523 | validate_siginfo_access (); |
6524 | ||
4aa995e1 PA |
6525 | transferred = |
6526 | target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, | |
6527 | NULL, | |
6528 | value_contents_all_raw (v), | |
6529 | value_offset (v), | |
6530 | TYPE_LENGTH (value_type (v))); | |
6531 | ||
6532 | if (transferred != TYPE_LENGTH (value_type (v))) | |
6533 | error (_("Unable to read siginfo")); | |
6534 | } | |
6535 | ||
6536 | /* This function implements the lval_computed support for writing a | |
6537 | $_siginfo value. */ | |
6538 | ||
6539 | static void | |
6540 | siginfo_value_write (struct value *v, struct value *fromval) | |
6541 | { | |
6542 | LONGEST transferred; | |
6543 | ||
c709acd1 PA |
6544 | validate_siginfo_access (); |
6545 | ||
4aa995e1 PA |
6546 | transferred = target_write (¤t_target, |
6547 | TARGET_OBJECT_SIGNAL_INFO, | |
6548 | NULL, | |
6549 | value_contents_all_raw (fromval), | |
6550 | value_offset (v), | |
6551 | TYPE_LENGTH (value_type (fromval))); | |
6552 | ||
6553 | if (transferred != TYPE_LENGTH (value_type (fromval))) | |
6554 | error (_("Unable to write siginfo")); | |
6555 | } | |
6556 | ||
c8f2448a | 6557 | static const struct lval_funcs siginfo_value_funcs = |
4aa995e1 PA |
6558 | { |
6559 | siginfo_value_read, | |
6560 | siginfo_value_write | |
6561 | }; | |
6562 | ||
6563 | /* Return a new value with the correct type for the siginfo object of | |
78267919 UW |
6564 | the current thread using architecture GDBARCH. Return a void value |
6565 | if there's no object available. */ | |
4aa995e1 | 6566 | |
2c0b251b | 6567 | static struct value * |
78267919 | 6568 | siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var) |
4aa995e1 | 6569 | { |
4aa995e1 | 6570 | if (target_has_stack |
78267919 UW |
6571 | && !ptid_equal (inferior_ptid, null_ptid) |
6572 | && gdbarch_get_siginfo_type_p (gdbarch)) | |
4aa995e1 | 6573 | { |
78267919 | 6574 | struct type *type = gdbarch_get_siginfo_type (gdbarch); |
abbb1732 | 6575 | |
78267919 | 6576 | return allocate_computed_value (type, &siginfo_value_funcs, NULL); |
4aa995e1 PA |
6577 | } |
6578 | ||
78267919 | 6579 | return allocate_value (builtin_type (gdbarch)->builtin_void); |
4aa995e1 PA |
6580 | } |
6581 | ||
c906108c | 6582 | \f |
16c381f0 JK |
6583 | /* infcall_suspend_state contains state about the program itself like its |
6584 | registers and any signal it received when it last stopped. | |
6585 | This state must be restored regardless of how the inferior function call | |
6586 | ends (either successfully, or after it hits a breakpoint or signal) | |
6587 | if the program is to properly continue where it left off. */ | |
6588 | ||
6589 | struct infcall_suspend_state | |
7a292a7a | 6590 | { |
16c381f0 JK |
6591 | struct thread_suspend_state thread_suspend; |
6592 | struct inferior_suspend_state inferior_suspend; | |
6593 | ||
6594 | /* Other fields: */ | |
7a292a7a | 6595 | CORE_ADDR stop_pc; |
b89667eb | 6596 | struct regcache *registers; |
1736ad11 | 6597 | |
35515841 | 6598 | /* Format of SIGINFO_DATA or NULL if it is not present. */ |
1736ad11 JK |
6599 | struct gdbarch *siginfo_gdbarch; |
6600 | ||
6601 | /* The inferior format depends on SIGINFO_GDBARCH and it has a length of | |
6602 | TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the | |
6603 | content would be invalid. */ | |
6604 | gdb_byte *siginfo_data; | |
b89667eb DE |
6605 | }; |
6606 | ||
16c381f0 JK |
6607 | struct infcall_suspend_state * |
6608 | save_infcall_suspend_state (void) | |
b89667eb | 6609 | { |
16c381f0 | 6610 | struct infcall_suspend_state *inf_state; |
b89667eb | 6611 | struct thread_info *tp = inferior_thread (); |
16c381f0 | 6612 | struct inferior *inf = current_inferior (); |
1736ad11 JK |
6613 | struct regcache *regcache = get_current_regcache (); |
6614 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
6615 | gdb_byte *siginfo_data = NULL; | |
6616 | ||
6617 | if (gdbarch_get_siginfo_type_p (gdbarch)) | |
6618 | { | |
6619 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
6620 | size_t len = TYPE_LENGTH (type); | |
6621 | struct cleanup *back_to; | |
6622 | ||
6623 | siginfo_data = xmalloc (len); | |
6624 | back_to = make_cleanup (xfree, siginfo_data); | |
6625 | ||
6626 | if (target_read (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6627 | siginfo_data, 0, len) == len) | |
6628 | discard_cleanups (back_to); | |
6629 | else | |
6630 | { | |
6631 | /* Errors ignored. */ | |
6632 | do_cleanups (back_to); | |
6633 | siginfo_data = NULL; | |
6634 | } | |
6635 | } | |
6636 | ||
16c381f0 | 6637 | inf_state = XZALLOC (struct infcall_suspend_state); |
1736ad11 JK |
6638 | |
6639 | if (siginfo_data) | |
6640 | { | |
6641 | inf_state->siginfo_gdbarch = gdbarch; | |
6642 | inf_state->siginfo_data = siginfo_data; | |
6643 | } | |
b89667eb | 6644 | |
16c381f0 JK |
6645 | inf_state->thread_suspend = tp->suspend; |
6646 | inf_state->inferior_suspend = inf->suspend; | |
6647 | ||
35515841 JK |
6648 | /* run_inferior_call will not use the signal due to its `proceed' call with |
6649 | TARGET_SIGNAL_0 anyway. */ | |
16c381f0 | 6650 | tp->suspend.stop_signal = TARGET_SIGNAL_0; |
35515841 | 6651 | |
b89667eb DE |
6652 | inf_state->stop_pc = stop_pc; |
6653 | ||
1736ad11 | 6654 | inf_state->registers = regcache_dup (regcache); |
b89667eb DE |
6655 | |
6656 | return inf_state; | |
6657 | } | |
6658 | ||
6659 | /* Restore inferior session state to INF_STATE. */ | |
6660 | ||
6661 | void | |
16c381f0 | 6662 | restore_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
6663 | { |
6664 | struct thread_info *tp = inferior_thread (); | |
16c381f0 | 6665 | struct inferior *inf = current_inferior (); |
1736ad11 JK |
6666 | struct regcache *regcache = get_current_regcache (); |
6667 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
b89667eb | 6668 | |
16c381f0 JK |
6669 | tp->suspend = inf_state->thread_suspend; |
6670 | inf->suspend = inf_state->inferior_suspend; | |
6671 | ||
b89667eb DE |
6672 | stop_pc = inf_state->stop_pc; |
6673 | ||
1736ad11 JK |
6674 | if (inf_state->siginfo_gdbarch == gdbarch) |
6675 | { | |
6676 | struct type *type = gdbarch_get_siginfo_type (gdbarch); | |
6677 | size_t len = TYPE_LENGTH (type); | |
6678 | ||
6679 | /* Errors ignored. */ | |
6680 | target_write (¤t_target, TARGET_OBJECT_SIGNAL_INFO, NULL, | |
6681 | inf_state->siginfo_data, 0, len); | |
6682 | } | |
6683 | ||
b89667eb DE |
6684 | /* The inferior can be gone if the user types "print exit(0)" |
6685 | (and perhaps other times). */ | |
6686 | if (target_has_execution) | |
6687 | /* NB: The register write goes through to the target. */ | |
1736ad11 | 6688 | regcache_cpy (regcache, inf_state->registers); |
803b5f95 | 6689 | |
16c381f0 | 6690 | discard_infcall_suspend_state (inf_state); |
b89667eb DE |
6691 | } |
6692 | ||
6693 | static void | |
16c381f0 | 6694 | do_restore_infcall_suspend_state_cleanup (void *state) |
b89667eb | 6695 | { |
16c381f0 | 6696 | restore_infcall_suspend_state (state); |
b89667eb DE |
6697 | } |
6698 | ||
6699 | struct cleanup * | |
16c381f0 JK |
6700 | make_cleanup_restore_infcall_suspend_state |
6701 | (struct infcall_suspend_state *inf_state) | |
b89667eb | 6702 | { |
16c381f0 | 6703 | return make_cleanup (do_restore_infcall_suspend_state_cleanup, inf_state); |
b89667eb DE |
6704 | } |
6705 | ||
6706 | void | |
16c381f0 | 6707 | discard_infcall_suspend_state (struct infcall_suspend_state *inf_state) |
b89667eb DE |
6708 | { |
6709 | regcache_xfree (inf_state->registers); | |
803b5f95 | 6710 | xfree (inf_state->siginfo_data); |
b89667eb DE |
6711 | xfree (inf_state); |
6712 | } | |
6713 | ||
6714 | struct regcache * | |
16c381f0 | 6715 | get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state) |
b89667eb DE |
6716 | { |
6717 | return inf_state->registers; | |
6718 | } | |
6719 | ||
16c381f0 JK |
6720 | /* infcall_control_state contains state regarding gdb's control of the |
6721 | inferior itself like stepping control. It also contains session state like | |
6722 | the user's currently selected frame. */ | |
b89667eb | 6723 | |
16c381f0 | 6724 | struct infcall_control_state |
b89667eb | 6725 | { |
16c381f0 JK |
6726 | struct thread_control_state thread_control; |
6727 | struct inferior_control_state inferior_control; | |
d82142e2 JK |
6728 | |
6729 | /* Other fields: */ | |
6730 | enum stop_stack_kind stop_stack_dummy; | |
6731 | int stopped_by_random_signal; | |
7a292a7a | 6732 | int stop_after_trap; |
7a292a7a | 6733 | |
b89667eb | 6734 | /* ID if the selected frame when the inferior function call was made. */ |
101dcfbe | 6735 | struct frame_id selected_frame_id; |
7a292a7a SS |
6736 | }; |
6737 | ||
c906108c | 6738 | /* Save all of the information associated with the inferior<==>gdb |
b89667eb | 6739 | connection. */ |
c906108c | 6740 | |
16c381f0 JK |
6741 | struct infcall_control_state * |
6742 | save_infcall_control_state (void) | |
c906108c | 6743 | { |
16c381f0 | 6744 | struct infcall_control_state *inf_status = xmalloc (sizeof (*inf_status)); |
4e1c45ea | 6745 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 6746 | struct inferior *inf = current_inferior (); |
7a292a7a | 6747 | |
16c381f0 JK |
6748 | inf_status->thread_control = tp->control; |
6749 | inf_status->inferior_control = inf->control; | |
d82142e2 | 6750 | |
8358c15c | 6751 | tp->control.step_resume_breakpoint = NULL; |
5b79abe7 | 6752 | tp->control.exception_resume_breakpoint = NULL; |
8358c15c | 6753 | |
16c381f0 JK |
6754 | /* Save original bpstat chain to INF_STATUS; replace it in TP with copy of |
6755 | chain. If caller's caller is walking the chain, they'll be happier if we | |
6756 | hand them back the original chain when restore_infcall_control_state is | |
6757 | called. */ | |
6758 | tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat); | |
d82142e2 JK |
6759 | |
6760 | /* Other fields: */ | |
6761 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
6762 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
6763 | inf_status->stop_after_trap = stop_after_trap; | |
c5aa993b | 6764 | |
206415a3 | 6765 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
b89667eb | 6766 | |
7a292a7a | 6767 | return inf_status; |
c906108c SS |
6768 | } |
6769 | ||
c906108c | 6770 | static int |
96baa820 | 6771 | restore_selected_frame (void *args) |
c906108c | 6772 | { |
488f131b | 6773 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 6774 | struct frame_info *frame; |
c906108c | 6775 | |
101dcfbe | 6776 | frame = frame_find_by_id (*fid); |
c906108c | 6777 | |
aa0cd9c1 AC |
6778 | /* If inf_status->selected_frame_id is NULL, there was no previously |
6779 | selected frame. */ | |
101dcfbe | 6780 | if (frame == NULL) |
c906108c | 6781 | { |
8a3fe4f8 | 6782 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
6783 | return 0; |
6784 | } | |
6785 | ||
0f7d239c | 6786 | select_frame (frame); |
c906108c SS |
6787 | |
6788 | return (1); | |
6789 | } | |
6790 | ||
b89667eb DE |
6791 | /* Restore inferior session state to INF_STATUS. */ |
6792 | ||
c906108c | 6793 | void |
16c381f0 | 6794 | restore_infcall_control_state (struct infcall_control_state *inf_status) |
c906108c | 6795 | { |
4e1c45ea | 6796 | struct thread_info *tp = inferior_thread (); |
d6b48e9c | 6797 | struct inferior *inf = current_inferior (); |
4e1c45ea | 6798 | |
8358c15c JK |
6799 | if (tp->control.step_resume_breakpoint) |
6800 | tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop; | |
6801 | ||
5b79abe7 TT |
6802 | if (tp->control.exception_resume_breakpoint) |
6803 | tp->control.exception_resume_breakpoint->disposition | |
6804 | = disp_del_at_next_stop; | |
6805 | ||
d82142e2 | 6806 | /* Handle the bpstat_copy of the chain. */ |
16c381f0 | 6807 | bpstat_clear (&tp->control.stop_bpstat); |
d82142e2 | 6808 | |
16c381f0 JK |
6809 | tp->control = inf_status->thread_control; |
6810 | inf->control = inf_status->inferior_control; | |
d82142e2 JK |
6811 | |
6812 | /* Other fields: */ | |
6813 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
6814 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
6815 | stop_after_trap = inf_status->stop_after_trap; | |
c906108c | 6816 | |
b89667eb | 6817 | if (target_has_stack) |
c906108c | 6818 | { |
c906108c | 6819 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
6820 | walking the stack might encounter a garbage pointer and |
6821 | error() trying to dereference it. */ | |
488f131b JB |
6822 | if (catch_errors |
6823 | (restore_selected_frame, &inf_status->selected_frame_id, | |
6824 | "Unable to restore previously selected frame:\n", | |
6825 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
6826 | /* Error in restoring the selected frame. Select the innermost |
6827 | frame. */ | |
0f7d239c | 6828 | select_frame (get_current_frame ()); |
c906108c | 6829 | } |
c906108c | 6830 | |
72cec141 | 6831 | xfree (inf_status); |
7a292a7a | 6832 | } |
c906108c | 6833 | |
74b7792f | 6834 | static void |
16c381f0 | 6835 | do_restore_infcall_control_state_cleanup (void *sts) |
74b7792f | 6836 | { |
16c381f0 | 6837 | restore_infcall_control_state (sts); |
74b7792f AC |
6838 | } |
6839 | ||
6840 | struct cleanup * | |
16c381f0 JK |
6841 | make_cleanup_restore_infcall_control_state |
6842 | (struct infcall_control_state *inf_status) | |
74b7792f | 6843 | { |
16c381f0 | 6844 | return make_cleanup (do_restore_infcall_control_state_cleanup, inf_status); |
74b7792f AC |
6845 | } |
6846 | ||
c906108c | 6847 | void |
16c381f0 | 6848 | discard_infcall_control_state (struct infcall_control_state *inf_status) |
7a292a7a | 6849 | { |
8358c15c JK |
6850 | if (inf_status->thread_control.step_resume_breakpoint) |
6851 | inf_status->thread_control.step_resume_breakpoint->disposition | |
6852 | = disp_del_at_next_stop; | |
6853 | ||
5b79abe7 TT |
6854 | if (inf_status->thread_control.exception_resume_breakpoint) |
6855 | inf_status->thread_control.exception_resume_breakpoint->disposition | |
6856 | = disp_del_at_next_stop; | |
6857 | ||
1777feb0 | 6858 | /* See save_infcall_control_state for info on stop_bpstat. */ |
16c381f0 | 6859 | bpstat_clear (&inf_status->thread_control.stop_bpstat); |
8358c15c | 6860 | |
72cec141 | 6861 | xfree (inf_status); |
7a292a7a | 6862 | } |
b89667eb | 6863 | \f |
47932f85 | 6864 | int |
3a3e9ee3 | 6865 | inferior_has_forked (ptid_t pid, ptid_t *child_pid) |
47932f85 DJ |
6866 | { |
6867 | struct target_waitstatus last; | |
6868 | ptid_t last_ptid; | |
6869 | ||
6870 | get_last_target_status (&last_ptid, &last); | |
6871 | ||
6872 | if (last.kind != TARGET_WAITKIND_FORKED) | |
6873 | return 0; | |
6874 | ||
3a3e9ee3 | 6875 | if (!ptid_equal (last_ptid, pid)) |
47932f85 DJ |
6876 | return 0; |
6877 | ||
6878 | *child_pid = last.value.related_pid; | |
6879 | return 1; | |
6880 | } | |
6881 | ||
6882 | int | |
3a3e9ee3 | 6883 | inferior_has_vforked (ptid_t pid, ptid_t *child_pid) |
47932f85 DJ |
6884 | { |
6885 | struct target_waitstatus last; | |
6886 | ptid_t last_ptid; | |
6887 | ||
6888 | get_last_target_status (&last_ptid, &last); | |
6889 | ||
6890 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
6891 | return 0; | |
6892 | ||
3a3e9ee3 | 6893 | if (!ptid_equal (last_ptid, pid)) |
47932f85 DJ |
6894 | return 0; |
6895 | ||
6896 | *child_pid = last.value.related_pid; | |
6897 | return 1; | |
6898 | } | |
6899 | ||
6900 | int | |
3a3e9ee3 | 6901 | inferior_has_execd (ptid_t pid, char **execd_pathname) |
47932f85 DJ |
6902 | { |
6903 | struct target_waitstatus last; | |
6904 | ptid_t last_ptid; | |
6905 | ||
6906 | get_last_target_status (&last_ptid, &last); | |
6907 | ||
6908 | if (last.kind != TARGET_WAITKIND_EXECD) | |
6909 | return 0; | |
6910 | ||
3a3e9ee3 | 6911 | if (!ptid_equal (last_ptid, pid)) |
47932f85 DJ |
6912 | return 0; |
6913 | ||
6914 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
6915 | return 1; | |
6916 | } | |
6917 | ||
a96d9b2e SDJ |
6918 | int |
6919 | inferior_has_called_syscall (ptid_t pid, int *syscall_number) | |
6920 | { | |
6921 | struct target_waitstatus last; | |
6922 | ptid_t last_ptid; | |
6923 | ||
6924 | get_last_target_status (&last_ptid, &last); | |
6925 | ||
6926 | if (last.kind != TARGET_WAITKIND_SYSCALL_ENTRY && | |
6927 | last.kind != TARGET_WAITKIND_SYSCALL_RETURN) | |
6928 | return 0; | |
6929 | ||
6930 | if (!ptid_equal (last_ptid, pid)) | |
6931 | return 0; | |
6932 | ||
6933 | *syscall_number = last.value.syscall_number; | |
6934 | return 1; | |
6935 | } | |
6936 | ||
0723dbf5 PA |
6937 | int |
6938 | ptid_match (ptid_t ptid, ptid_t filter) | |
6939 | { | |
0723dbf5 PA |
6940 | if (ptid_equal (filter, minus_one_ptid)) |
6941 | return 1; | |
6942 | if (ptid_is_pid (filter) | |
6943 | && ptid_get_pid (ptid) == ptid_get_pid (filter)) | |
6944 | return 1; | |
6945 | else if (ptid_equal (ptid, filter)) | |
6946 | return 1; | |
6947 | ||
6948 | return 0; | |
6949 | } | |
6950 | ||
ca6724c1 KB |
6951 | /* restore_inferior_ptid() will be used by the cleanup machinery |
6952 | to restore the inferior_ptid value saved in a call to | |
6953 | save_inferior_ptid(). */ | |
ce696e05 KB |
6954 | |
6955 | static void | |
6956 | restore_inferior_ptid (void *arg) | |
6957 | { | |
6958 | ptid_t *saved_ptid_ptr = arg; | |
abbb1732 | 6959 | |
ce696e05 KB |
6960 | inferior_ptid = *saved_ptid_ptr; |
6961 | xfree (arg); | |
6962 | } | |
6963 | ||
6964 | /* Save the value of inferior_ptid so that it may be restored by a | |
6965 | later call to do_cleanups(). Returns the struct cleanup pointer | |
6966 | needed for later doing the cleanup. */ | |
6967 | ||
6968 | struct cleanup * | |
6969 | save_inferior_ptid (void) | |
6970 | { | |
6971 | ptid_t *saved_ptid_ptr; | |
6972 | ||
6973 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
6974 | *saved_ptid_ptr = inferior_ptid; | |
6975 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
6976 | } | |
c5aa993b | 6977 | \f |
488f131b | 6978 | |
b2175913 MS |
6979 | /* User interface for reverse debugging: |
6980 | Set exec-direction / show exec-direction commands | |
6981 | (returns error unless target implements to_set_exec_direction method). */ | |
6982 | ||
32231432 | 6983 | int execution_direction = EXEC_FORWARD; |
b2175913 MS |
6984 | static const char exec_forward[] = "forward"; |
6985 | static const char exec_reverse[] = "reverse"; | |
6986 | static const char *exec_direction = exec_forward; | |
6987 | static const char *exec_direction_names[] = { | |
6988 | exec_forward, | |
6989 | exec_reverse, | |
6990 | NULL | |
6991 | }; | |
6992 | ||
6993 | static void | |
6994 | set_exec_direction_func (char *args, int from_tty, | |
6995 | struct cmd_list_element *cmd) | |
6996 | { | |
6997 | if (target_can_execute_reverse) | |
6998 | { | |
6999 | if (!strcmp (exec_direction, exec_forward)) | |
7000 | execution_direction = EXEC_FORWARD; | |
7001 | else if (!strcmp (exec_direction, exec_reverse)) | |
7002 | execution_direction = EXEC_REVERSE; | |
7003 | } | |
8bbed405 MS |
7004 | else |
7005 | { | |
7006 | exec_direction = exec_forward; | |
7007 | error (_("Target does not support this operation.")); | |
7008 | } | |
b2175913 MS |
7009 | } |
7010 | ||
7011 | static void | |
7012 | show_exec_direction_func (struct ui_file *out, int from_tty, | |
7013 | struct cmd_list_element *cmd, const char *value) | |
7014 | { | |
7015 | switch (execution_direction) { | |
7016 | case EXEC_FORWARD: | |
7017 | fprintf_filtered (out, _("Forward.\n")); | |
7018 | break; | |
7019 | case EXEC_REVERSE: | |
7020 | fprintf_filtered (out, _("Reverse.\n")); | |
7021 | break; | |
b2175913 | 7022 | default: |
d8b34453 PA |
7023 | internal_error (__FILE__, __LINE__, |
7024 | _("bogus execution_direction value: %d"), | |
7025 | (int) execution_direction); | |
b2175913 MS |
7026 | } |
7027 | } | |
7028 | ||
7029 | /* User interface for non-stop mode. */ | |
7030 | ||
ad52ddc6 | 7031 | int non_stop = 0; |
ad52ddc6 PA |
7032 | |
7033 | static void | |
7034 | set_non_stop (char *args, int from_tty, | |
7035 | struct cmd_list_element *c) | |
7036 | { | |
7037 | if (target_has_execution) | |
7038 | { | |
7039 | non_stop_1 = non_stop; | |
7040 | error (_("Cannot change this setting while the inferior is running.")); | |
7041 | } | |
7042 | ||
7043 | non_stop = non_stop_1; | |
7044 | } | |
7045 | ||
7046 | static void | |
7047 | show_non_stop (struct ui_file *file, int from_tty, | |
7048 | struct cmd_list_element *c, const char *value) | |
7049 | { | |
7050 | fprintf_filtered (file, | |
7051 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
7052 | value); | |
7053 | } | |
7054 | ||
d4db2f36 PA |
7055 | static void |
7056 | show_schedule_multiple (struct ui_file *file, int from_tty, | |
7057 | struct cmd_list_element *c, const char *value) | |
7058 | { | |
3e43a32a MS |
7059 | fprintf_filtered (file, _("Resuming the execution of threads " |
7060 | "of all processes is %s.\n"), value); | |
d4db2f36 | 7061 | } |
ad52ddc6 | 7062 | |
c906108c | 7063 | void |
96baa820 | 7064 | _initialize_infrun (void) |
c906108c | 7065 | { |
52f0bd74 AC |
7066 | int i; |
7067 | int numsigs; | |
c906108c | 7068 | |
1bedd215 AC |
7069 | add_info ("signals", signals_info, _("\ |
7070 | What debugger does when program gets various signals.\n\ | |
7071 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
7072 | add_info_alias ("handle", "signals", 0); |
7073 | ||
1bedd215 AC |
7074 | add_com ("handle", class_run, handle_command, _("\ |
7075 | Specify how to handle a signal.\n\ | |
c906108c SS |
7076 | Args are signals and actions to apply to those signals.\n\ |
7077 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
7078 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
7079 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
7080 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
7081 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
7082 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
c906108c SS |
7083 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
7084 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
7085 | Print means print a message if this signal happens.\n\ | |
7086 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
7087 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 7088 | Pass and Stop may be combined.")); |
c906108c SS |
7089 | if (xdb_commands) |
7090 | { | |
1bedd215 AC |
7091 | add_com ("lz", class_info, signals_info, _("\ |
7092 | What debugger does when program gets various signals.\n\ | |
7093 | Specify a signal as argument to print info on that signal only.")); | |
7094 | add_com ("z", class_run, xdb_handle_command, _("\ | |
7095 | Specify how to handle a signal.\n\ | |
c906108c SS |
7096 | Args are signals and actions to apply to those signals.\n\ |
7097 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
7098 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
7099 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
7100 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 | 7101 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
cce7e648 | 7102 | Recognized actions include \"s\" (toggles between stop and nostop),\n\ |
c906108c SS |
7103 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
7104 | nopass), \"Q\" (noprint)\n\ | |
7105 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
7106 | Print means print a message if this signal happens.\n\ | |
7107 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
7108 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 7109 | Pass and Stop may be combined.")); |
c906108c SS |
7110 | } |
7111 | ||
7112 | if (!dbx_commands) | |
1a966eab AC |
7113 | stop_command = add_cmd ("stop", class_obscure, |
7114 | not_just_help_class_command, _("\ | |
7115 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 7116 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 7117 | of the program stops."), &cmdlist); |
c906108c | 7118 | |
85c07804 AC |
7119 | add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
7120 | Set inferior debugging."), _("\ | |
7121 | Show inferior debugging."), _("\ | |
7122 | When non-zero, inferior specific debugging is enabled."), | |
7123 | NULL, | |
920d2a44 | 7124 | show_debug_infrun, |
85c07804 | 7125 | &setdebuglist, &showdebuglist); |
527159b7 | 7126 | |
3e43a32a MS |
7127 | add_setshow_boolean_cmd ("displaced", class_maintenance, |
7128 | &debug_displaced, _("\ | |
237fc4c9 PA |
7129 | Set displaced stepping debugging."), _("\ |
7130 | Show displaced stepping debugging."), _("\ | |
7131 | When non-zero, displaced stepping specific debugging is enabled."), | |
7132 | NULL, | |
7133 | show_debug_displaced, | |
7134 | &setdebuglist, &showdebuglist); | |
7135 | ||
ad52ddc6 PA |
7136 | add_setshow_boolean_cmd ("non-stop", no_class, |
7137 | &non_stop_1, _("\ | |
7138 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
7139 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
7140 | When debugging a multi-threaded program and this setting is\n\ | |
7141 | off (the default, also called all-stop mode), when one thread stops\n\ | |
7142 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
7143 | all other threads in the program while you interact with the thread of\n\ | |
7144 | interest. When you continue or step a thread, you can allow the other\n\ | |
7145 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
7146 | thread's state, all threads stop.\n\ | |
7147 | \n\ | |
7148 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
7149 | to run freely. You'll be able to step each thread independently,\n\ | |
7150 | leave it stopped or free to run as needed."), | |
7151 | set_non_stop, | |
7152 | show_non_stop, | |
7153 | &setlist, | |
7154 | &showlist); | |
7155 | ||
c906108c | 7156 | numsigs = (int) TARGET_SIGNAL_LAST; |
488f131b | 7157 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
7158 | signal_print = (unsigned char *) |
7159 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
7160 | signal_program = (unsigned char *) | |
7161 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
2455069d UW |
7162 | signal_pass = (unsigned char *) |
7163 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
c906108c SS |
7164 | for (i = 0; i < numsigs; i++) |
7165 | { | |
7166 | signal_stop[i] = 1; | |
7167 | signal_print[i] = 1; | |
7168 | signal_program[i] = 1; | |
7169 | } | |
7170 | ||
7171 | /* Signals caused by debugger's own actions | |
7172 | should not be given to the program afterwards. */ | |
7173 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
7174 | signal_program[TARGET_SIGNAL_INT] = 0; | |
7175 | ||
7176 | /* Signals that are not errors should not normally enter the debugger. */ | |
7177 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
7178 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
7179 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
7180 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
7181 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
7182 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
7183 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
7184 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
7185 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
7186 | signal_print[TARGET_SIGNAL_IO] = 0; | |
7187 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
7188 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
7189 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
7190 | signal_print[TARGET_SIGNAL_URG] = 0; | |
7191 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
7192 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
16dfc9ce JB |
7193 | signal_stop[TARGET_SIGNAL_PRIO] = 0; |
7194 | signal_print[TARGET_SIGNAL_PRIO] = 0; | |
c906108c | 7195 | |
cd0fc7c3 SS |
7196 | /* These signals are used internally by user-level thread |
7197 | implementations. (See signal(5) on Solaris.) Like the above | |
7198 | signals, a healthy program receives and handles them as part of | |
7199 | its normal operation. */ | |
7200 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
7201 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
7202 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
7203 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
7204 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
7205 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
7206 | ||
2455069d UW |
7207 | /* Update cached state. */ |
7208 | signal_cache_update (-1); | |
7209 | ||
85c07804 AC |
7210 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
7211 | &stop_on_solib_events, _("\ | |
7212 | Set stopping for shared library events."), _("\ | |
7213 | Show stopping for shared library events."), _("\ | |
c906108c SS |
7214 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
7215 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 AC |
7216 | to the user would be loading/unloading of a new library."), |
7217 | NULL, | |
920d2a44 | 7218 | show_stop_on_solib_events, |
85c07804 | 7219 | &setlist, &showlist); |
c906108c | 7220 | |
7ab04401 AC |
7221 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
7222 | follow_fork_mode_kind_names, | |
7223 | &follow_fork_mode_string, _("\ | |
7224 | Set debugger response to a program call of fork or vfork."), _("\ | |
7225 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
7226 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
7227 | parent - the original process is debugged after a fork\n\ | |
7228 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 7229 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
7230 | By default, the debugger will follow the parent process."), |
7231 | NULL, | |
920d2a44 | 7232 | show_follow_fork_mode_string, |
7ab04401 AC |
7233 | &setlist, &showlist); |
7234 | ||
6c95b8df PA |
7235 | add_setshow_enum_cmd ("follow-exec-mode", class_run, |
7236 | follow_exec_mode_names, | |
7237 | &follow_exec_mode_string, _("\ | |
7238 | Set debugger response to a program call of exec."), _("\ | |
7239 | Show debugger response to a program call of exec."), _("\ | |
7240 | An exec call replaces the program image of a process.\n\ | |
7241 | \n\ | |
7242 | follow-exec-mode can be:\n\ | |
7243 | \n\ | |
cce7e648 | 7244 | new - the debugger creates a new inferior and rebinds the process\n\ |
6c95b8df PA |
7245 | to this new inferior. The program the process was running before\n\ |
7246 | the exec call can be restarted afterwards by restarting the original\n\ | |
7247 | inferior.\n\ | |
7248 | \n\ | |
7249 | same - the debugger keeps the process bound to the same inferior.\n\ | |
7250 | The new executable image replaces the previous executable loaded in\n\ | |
7251 | the inferior. Restarting the inferior after the exec call restarts\n\ | |
7252 | the executable the process was running after the exec call.\n\ | |
7253 | \n\ | |
7254 | By default, the debugger will use the same inferior."), | |
7255 | NULL, | |
7256 | show_follow_exec_mode_string, | |
7257 | &setlist, &showlist); | |
7258 | ||
7ab04401 AC |
7259 | add_setshow_enum_cmd ("scheduler-locking", class_run, |
7260 | scheduler_enums, &scheduler_mode, _("\ | |
7261 | Set mode for locking scheduler during execution."), _("\ | |
7262 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
7263 | off == no locking (threads may preempt at any time)\n\ |
7264 | on == full locking (no thread except the current thread may run)\n\ | |
7265 | step == scheduler locked during every single-step operation.\n\ | |
7266 | In this mode, no other thread may run during a step command.\n\ | |
7ab04401 AC |
7267 | Other threads may run while stepping over a function call ('next')."), |
7268 | set_schedlock_func, /* traps on target vector */ | |
920d2a44 | 7269 | show_scheduler_mode, |
7ab04401 | 7270 | &setlist, &showlist); |
5fbbeb29 | 7271 | |
d4db2f36 PA |
7272 | add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\ |
7273 | Set mode for resuming threads of all processes."), _("\ | |
7274 | Show mode for resuming threads of all processes."), _("\ | |
7275 | When on, execution commands (such as 'continue' or 'next') resume all\n\ | |
7276 | threads of all processes. When off (which is the default), execution\n\ | |
7277 | commands only resume the threads of the current process. The set of\n\ | |
7278 | threads that are resumed is further refined by the scheduler-locking\n\ | |
7279 | mode (see help set scheduler-locking)."), | |
7280 | NULL, | |
7281 | show_schedule_multiple, | |
7282 | &setlist, &showlist); | |
7283 | ||
5bf193a2 AC |
7284 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
7285 | Set mode of the step operation."), _("\ | |
7286 | Show mode of the step operation."), _("\ | |
7287 | When set, doing a step over a function without debug line information\n\ | |
7288 | will stop at the first instruction of that function. Otherwise, the\n\ | |
7289 | function is skipped and the step command stops at a different source line."), | |
7290 | NULL, | |
920d2a44 | 7291 | show_step_stop_if_no_debug, |
5bf193a2 | 7292 | &setlist, &showlist); |
ca6724c1 | 7293 | |
fff08868 HZ |
7294 | add_setshow_enum_cmd ("displaced-stepping", class_run, |
7295 | can_use_displaced_stepping_enum, | |
7296 | &can_use_displaced_stepping, _("\ | |
237fc4c9 PA |
7297 | Set debugger's willingness to use displaced stepping."), _("\ |
7298 | Show debugger's willingness to use displaced stepping."), _("\ | |
fff08868 HZ |
7299 | If on, gdb will use displaced stepping to step over breakpoints if it is\n\ |
7300 | supported by the target architecture. If off, gdb will not use displaced\n\ | |
7301 | stepping to step over breakpoints, even if such is supported by the target\n\ | |
7302 | architecture. If auto (which is the default), gdb will use displaced stepping\n\ | |
7303 | if the target architecture supports it and non-stop mode is active, but will not\n\ | |
7304 | use it in all-stop mode (see help set non-stop)."), | |
7305 | NULL, | |
7306 | show_can_use_displaced_stepping, | |
7307 | &setlist, &showlist); | |
237fc4c9 | 7308 | |
b2175913 MS |
7309 | add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names, |
7310 | &exec_direction, _("Set direction of execution.\n\ | |
7311 | Options are 'forward' or 'reverse'."), | |
7312 | _("Show direction of execution (forward/reverse)."), | |
7313 | _("Tells gdb whether to execute forward or backward."), | |
7314 | set_exec_direction_func, show_exec_direction_func, | |
7315 | &setlist, &showlist); | |
7316 | ||
6c95b8df PA |
7317 | /* Set/show detach-on-fork: user-settable mode. */ |
7318 | ||
7319 | add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\ | |
7320 | Set whether gdb will detach the child of a fork."), _("\ | |
7321 | Show whether gdb will detach the child of a fork."), _("\ | |
7322 | Tells gdb whether to detach the child of a fork."), | |
7323 | NULL, NULL, &setlist, &showlist); | |
7324 | ||
03583c20 UW |
7325 | /* Set/show disable address space randomization mode. */ |
7326 | ||
7327 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
7328 | &disable_randomization, _("\ | |
7329 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
7330 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
7331 | When this mode is on (which is the default), randomization of the virtual\n\ | |
7332 | address space is disabled. Standalone programs run with the randomization\n\ | |
7333 | enabled by default on some platforms."), | |
7334 | &set_disable_randomization, | |
7335 | &show_disable_randomization, | |
7336 | &setlist, &showlist); | |
7337 | ||
ca6724c1 | 7338 | /* ptid initializations */ |
ca6724c1 KB |
7339 | inferior_ptid = null_ptid; |
7340 | target_last_wait_ptid = minus_one_ptid; | |
5231c1fd PA |
7341 | |
7342 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
252fbfc8 | 7343 | observer_attach_thread_stop_requested (infrun_thread_stop_requested); |
a07daef3 | 7344 | observer_attach_thread_exit (infrun_thread_thread_exit); |
fc1cf338 | 7345 | observer_attach_inferior_exit (infrun_inferior_exit); |
4aa995e1 PA |
7346 | |
7347 | /* Explicitly create without lookup, since that tries to create a | |
7348 | value with a void typed value, and when we get here, gdbarch | |
7349 | isn't initialized yet. At this point, we're quite sure there | |
7350 | isn't another convenience variable of the same name. */ | |
7351 | create_internalvar_type_lazy ("_siginfo", siginfo_make_value); | |
d914c394 SS |
7352 | |
7353 | add_setshow_boolean_cmd ("observer", no_class, | |
7354 | &observer_mode_1, _("\ | |
7355 | Set whether gdb controls the inferior in observer mode."), _("\ | |
7356 | Show whether gdb controls the inferior in observer mode."), _("\ | |
7357 | In observer mode, GDB can get data from the inferior, but not\n\ | |
7358 | affect its execution. Registers and memory may not be changed,\n\ | |
7359 | breakpoints may not be set, and the program cannot be interrupted\n\ | |
7360 | or signalled."), | |
7361 | set_observer_mode, | |
7362 | show_observer_mode, | |
7363 | &setlist, | |
7364 | &showlist); | |
c906108c | 7365 | } |