Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
6aba47ca DJ |
4 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
5 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 | |
8621d6a9 | 6 | 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 | |
12 | the Free Software Foundation; either version 2 of the License, or | |
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 JM |
20 | You should have received a copy of the GNU General Public License |
21 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
22 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
23 | Boston, MA 02110-1301, USA. */ | |
c906108c SS |
24 | |
25 | #include "defs.h" | |
26 | #include "gdb_string.h" | |
27 | #include <ctype.h> | |
28 | #include "symtab.h" | |
29 | #include "frame.h" | |
30 | #include "inferior.h" | |
60250e8b | 31 | #include "exceptions.h" |
c906108c | 32 | #include "breakpoint.h" |
03f2053f | 33 | #include "gdb_wait.h" |
c906108c SS |
34 | #include "gdbcore.h" |
35 | #include "gdbcmd.h" | |
210661e7 | 36 | #include "cli/cli-script.h" |
c906108c SS |
37 | #include "target.h" |
38 | #include "gdbthread.h" | |
39 | #include "annotate.h" | |
1adeb98a | 40 | #include "symfile.h" |
7a292a7a | 41 | #include "top.h" |
c906108c | 42 | #include <signal.h> |
2acceee2 | 43 | #include "inf-loop.h" |
4e052eda | 44 | #include "regcache.h" |
fd0407d6 | 45 | #include "value.h" |
06600e06 | 46 | #include "observer.h" |
f636b87d | 47 | #include "language.h" |
a77053c2 | 48 | #include "solib.h" |
f17517ea | 49 | #include "main.h" |
a77053c2 | 50 | |
9f976b41 | 51 | #include "gdb_assert.h" |
034dad6f | 52 | #include "mi/mi-common.h" |
c906108c SS |
53 | |
54 | /* Prototypes for local functions */ | |
55 | ||
96baa820 | 56 | static void signals_info (char *, int); |
c906108c | 57 | |
96baa820 | 58 | static void handle_command (char *, int); |
c906108c | 59 | |
96baa820 | 60 | static void sig_print_info (enum target_signal); |
c906108c | 61 | |
96baa820 | 62 | static void sig_print_header (void); |
c906108c | 63 | |
74b7792f | 64 | static void resume_cleanups (void *); |
c906108c | 65 | |
96baa820 | 66 | static int hook_stop_stub (void *); |
c906108c | 67 | |
96baa820 JM |
68 | static int restore_selected_frame (void *); |
69 | ||
70 | static void build_infrun (void); | |
71 | ||
4ef3f3be | 72 | static int follow_fork (void); |
96baa820 JM |
73 | |
74 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 75 | struct cmd_list_element *c); |
96baa820 | 76 | |
96baa820 JM |
77 | struct execution_control_state; |
78 | ||
79 | static int currently_stepping (struct execution_control_state *ecs); | |
80 | ||
81 | static void xdb_handle_command (char *args, int from_tty); | |
82 | ||
ea67f13b DJ |
83 | static int prepare_to_proceed (void); |
84 | ||
96baa820 | 85 | void _initialize_infrun (void); |
43ff13b4 | 86 | |
c906108c SS |
87 | int inferior_ignoring_startup_exec_events = 0; |
88 | int inferior_ignoring_leading_exec_events = 0; | |
89 | ||
5fbbeb29 CF |
90 | /* When set, stop the 'step' command if we enter a function which has |
91 | no line number information. The normal behavior is that we step | |
92 | over such function. */ | |
93 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
94 | static void |
95 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
96 | struct cmd_list_element *c, const char *value) | |
97 | { | |
98 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
99 | } | |
5fbbeb29 | 100 | |
43ff13b4 | 101 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 102 | |
43ff13b4 JM |
103 | int sync_execution = 0; |
104 | ||
c906108c SS |
105 | /* wait_for_inferior and normal_stop use this to notify the user |
106 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
107 | running in. */ |
108 | ||
39f77062 | 109 | static ptid_t previous_inferior_ptid; |
7a292a7a SS |
110 | |
111 | /* This is true for configurations that may follow through execl() and | |
112 | similar functions. At present this is only true for HP-UX native. */ | |
113 | ||
114 | #ifndef MAY_FOLLOW_EXEC | |
115 | #define MAY_FOLLOW_EXEC (0) | |
c906108c SS |
116 | #endif |
117 | ||
7a292a7a SS |
118 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
119 | ||
527159b7 | 120 | static int debug_infrun = 0; |
920d2a44 AC |
121 | static void |
122 | show_debug_infrun (struct ui_file *file, int from_tty, | |
123 | struct cmd_list_element *c, const char *value) | |
124 | { | |
125 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
126 | } | |
527159b7 | 127 | |
d4f3574e SS |
128 | /* If the program uses ELF-style shared libraries, then calls to |
129 | functions in shared libraries go through stubs, which live in a | |
130 | table called the PLT (Procedure Linkage Table). The first time the | |
131 | function is called, the stub sends control to the dynamic linker, | |
132 | which looks up the function's real address, patches the stub so | |
133 | that future calls will go directly to the function, and then passes | |
134 | control to the function. | |
135 | ||
136 | If we are stepping at the source level, we don't want to see any of | |
137 | this --- we just want to skip over the stub and the dynamic linker. | |
138 | The simple approach is to single-step until control leaves the | |
139 | dynamic linker. | |
140 | ||
ca557f44 AC |
141 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
142 | dynamic linker calls functions in the shared C library, so you | |
143 | can't tell from the PC alone whether the dynamic linker is still | |
144 | running. In this case, we use a step-resume breakpoint to get us | |
145 | past the dynamic linker, as if we were using "next" to step over a | |
146 | function call. | |
d4f3574e SS |
147 | |
148 | IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic | |
149 | linker code or not. Normally, this means we single-step. However, | |
150 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
151 | address where we can place a step-resume breakpoint to get past the | |
152 | linker's symbol resolution function. | |
153 | ||
154 | IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a | |
155 | pretty portable way, by comparing the PC against the address ranges | |
156 | of the dynamic linker's sections. | |
157 | ||
158 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
159 | it depends on internal details of the dynamic linker. It's usually | |
160 | not too hard to figure out where to put a breakpoint, but it | |
161 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
162 | sanity checking. If it can't figure things out, returning zero and | |
163 | getting the (possibly confusing) stepping behavior is better than | |
164 | signalling an error, which will obscure the change in the | |
165 | inferior's state. */ | |
c906108c | 166 | |
c906108c SS |
167 | /* This function returns TRUE if pc is the address of an instruction |
168 | that lies within the dynamic linker (such as the event hook, or the | |
169 | dld itself). | |
170 | ||
171 | This function must be used only when a dynamic linker event has | |
172 | been caught, and the inferior is being stepped out of the hook, or | |
173 | undefined results are guaranteed. */ | |
174 | ||
175 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
176 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
177 | #endif | |
178 | ||
c2c6d25f JM |
179 | /* We can't step off a permanent breakpoint in the ordinary way, because we |
180 | can't remove it. Instead, we have to advance the PC to the next | |
181 | instruction. This macro should expand to a pointer to a function that | |
182 | does that, or zero if we have no such function. If we don't have a | |
183 | definition for it, we have to report an error. */ | |
488f131b | 184 | #ifndef SKIP_PERMANENT_BREAKPOINT |
c2c6d25f JM |
185 | #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint) |
186 | static void | |
c2d11a7d | 187 | default_skip_permanent_breakpoint (void) |
c2c6d25f | 188 | { |
8a3fe4f8 | 189 | error (_("\ |
c2c6d25f JM |
190 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ |
191 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
8a3fe4f8 | 192 | a command like `return' or `jump' to continue execution.")); |
c2c6d25f JM |
193 | } |
194 | #endif | |
488f131b | 195 | |
c2c6d25f | 196 | |
7a292a7a SS |
197 | /* Convert the #defines into values. This is temporary until wfi control |
198 | flow is completely sorted out. */ | |
199 | ||
200 | #ifndef HAVE_STEPPABLE_WATCHPOINT | |
201 | #define HAVE_STEPPABLE_WATCHPOINT 0 | |
202 | #else | |
203 | #undef HAVE_STEPPABLE_WATCHPOINT | |
204 | #define HAVE_STEPPABLE_WATCHPOINT 1 | |
205 | #endif | |
206 | ||
692590c1 MS |
207 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
208 | #define CANNOT_STEP_HW_WATCHPOINTS 0 | |
209 | #else | |
210 | #undef CANNOT_STEP_HW_WATCHPOINTS | |
211 | #define CANNOT_STEP_HW_WATCHPOINTS 1 | |
212 | #endif | |
213 | ||
c906108c SS |
214 | /* Tables of how to react to signals; the user sets them. */ |
215 | ||
216 | static unsigned char *signal_stop; | |
217 | static unsigned char *signal_print; | |
218 | static unsigned char *signal_program; | |
219 | ||
220 | #define SET_SIGS(nsigs,sigs,flags) \ | |
221 | do { \ | |
222 | int signum = (nsigs); \ | |
223 | while (signum-- > 0) \ | |
224 | if ((sigs)[signum]) \ | |
225 | (flags)[signum] = 1; \ | |
226 | } while (0) | |
227 | ||
228 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
229 | do { \ | |
230 | int signum = (nsigs); \ | |
231 | while (signum-- > 0) \ | |
232 | if ((sigs)[signum]) \ | |
233 | (flags)[signum] = 0; \ | |
234 | } while (0) | |
235 | ||
39f77062 KB |
236 | /* Value to pass to target_resume() to cause all threads to resume */ |
237 | ||
238 | #define RESUME_ALL (pid_to_ptid (-1)) | |
c906108c SS |
239 | |
240 | /* Command list pointer for the "stop" placeholder. */ | |
241 | ||
242 | static struct cmd_list_element *stop_command; | |
243 | ||
244 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
245 | ||
246 | static int breakpoints_inserted; | |
247 | ||
248 | /* Function inferior was in as of last step command. */ | |
249 | ||
250 | static struct symbol *step_start_function; | |
251 | ||
252 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
253 | ||
254 | static int trap_expected; | |
255 | ||
c906108c SS |
256 | /* Nonzero if we want to give control to the user when we're notified |
257 | of shared library events by the dynamic linker. */ | |
258 | static int stop_on_solib_events; | |
920d2a44 AC |
259 | static void |
260 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
261 | struct cmd_list_element *c, const char *value) | |
262 | { | |
263 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
264 | value); | |
265 | } | |
c906108c | 266 | |
c906108c SS |
267 | /* Nonzero means expecting a trace trap |
268 | and should stop the inferior and return silently when it happens. */ | |
269 | ||
270 | int stop_after_trap; | |
271 | ||
272 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
273 | It is used after attach, due to attaching to a process; | |
274 | when running in the shell before the child program has been exec'd; | |
275 | and when running some kinds of remote stuff (FIXME?). */ | |
276 | ||
c0236d92 | 277 | enum stop_kind stop_soon; |
c906108c SS |
278 | |
279 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
280 | situation when stop_registers should be saved. */ | |
281 | ||
282 | int proceed_to_finish; | |
283 | ||
284 | /* Save register contents here when about to pop a stack dummy frame, | |
285 | if-and-only-if proceed_to_finish is set. | |
286 | Thus this contains the return value from the called function (assuming | |
287 | values are returned in a register). */ | |
288 | ||
72cec141 | 289 | struct regcache *stop_registers; |
c906108c | 290 | |
c906108c SS |
291 | /* Nonzero after stop if current stack frame should be printed. */ |
292 | ||
293 | static int stop_print_frame; | |
294 | ||
295 | static struct breakpoint *step_resume_breakpoint = NULL; | |
c906108c | 296 | |
e02bc4cc | 297 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
298 | returned by target_wait()/deprecated_target_wait_hook(). This |
299 | information is returned by get_last_target_status(). */ | |
39f77062 | 300 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
301 | static struct target_waitstatus target_last_waitstatus; |
302 | ||
c906108c SS |
303 | /* This is used to remember when a fork, vfork or exec event |
304 | was caught by a catchpoint, and thus the event is to be | |
305 | followed at the next resume of the inferior, and not | |
306 | immediately. */ | |
307 | static struct | |
488f131b JB |
308 | { |
309 | enum target_waitkind kind; | |
310 | struct | |
c906108c | 311 | { |
488f131b | 312 | int parent_pid; |
488f131b | 313 | int child_pid; |
c906108c | 314 | } |
488f131b JB |
315 | fork_event; |
316 | char *execd_pathname; | |
317 | } | |
c906108c SS |
318 | pending_follow; |
319 | ||
53904c9e AC |
320 | static const char follow_fork_mode_child[] = "child"; |
321 | static const char follow_fork_mode_parent[] = "parent"; | |
322 | ||
488f131b | 323 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e AC |
324 | follow_fork_mode_child, |
325 | follow_fork_mode_parent, | |
326 | NULL | |
ef346e04 | 327 | }; |
c906108c | 328 | |
53904c9e | 329 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
330 | static void |
331 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
332 | struct cmd_list_element *c, const char *value) | |
333 | { | |
334 | fprintf_filtered (file, _("\ | |
335 | Debugger response to a program call of fork or vfork is \"%s\".\n"), | |
336 | value); | |
337 | } | |
c906108c SS |
338 | \f |
339 | ||
6604731b | 340 | static int |
4ef3f3be | 341 | follow_fork (void) |
c906108c | 342 | { |
ea1dd7bc | 343 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
c906108c | 344 | |
6604731b | 345 | return target_follow_fork (follow_child); |
c906108c SS |
346 | } |
347 | ||
6604731b DJ |
348 | void |
349 | follow_inferior_reset_breakpoints (void) | |
c906108c | 350 | { |
6604731b DJ |
351 | /* Was there a step_resume breakpoint? (There was if the user |
352 | did a "next" at the fork() call.) If so, explicitly reset its | |
353 | thread number. | |
354 | ||
355 | step_resumes are a form of bp that are made to be per-thread. | |
356 | Since we created the step_resume bp when the parent process | |
357 | was being debugged, and now are switching to the child process, | |
358 | from the breakpoint package's viewpoint, that's a switch of | |
359 | "threads". We must update the bp's notion of which thread | |
360 | it is for, or it'll be ignored when it triggers. */ | |
361 | ||
362 | if (step_resume_breakpoint) | |
363 | breakpoint_re_set_thread (step_resume_breakpoint); | |
364 | ||
365 | /* Reinsert all breakpoints in the child. The user may have set | |
366 | breakpoints after catching the fork, in which case those | |
367 | were never set in the child, but only in the parent. This makes | |
368 | sure the inserted breakpoints match the breakpoint list. */ | |
369 | ||
370 | breakpoint_re_set (); | |
371 | insert_breakpoints (); | |
c906108c | 372 | } |
c906108c | 373 | |
1adeb98a FN |
374 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
375 | ||
c906108c | 376 | static void |
96baa820 | 377 | follow_exec (int pid, char *execd_pathname) |
c906108c | 378 | { |
c906108c | 379 | int saved_pid = pid; |
7a292a7a SS |
380 | struct target_ops *tgt; |
381 | ||
382 | if (!may_follow_exec) | |
383 | return; | |
c906108c | 384 | |
c906108c SS |
385 | /* This is an exec event that we actually wish to pay attention to. |
386 | Refresh our symbol table to the newly exec'd program, remove any | |
387 | momentary bp's, etc. | |
388 | ||
389 | If there are breakpoints, they aren't really inserted now, | |
390 | since the exec() transformed our inferior into a fresh set | |
391 | of instructions. | |
392 | ||
393 | We want to preserve symbolic breakpoints on the list, since | |
394 | we have hopes that they can be reset after the new a.out's | |
395 | symbol table is read. | |
396 | ||
397 | However, any "raw" breakpoints must be removed from the list | |
398 | (e.g., the solib bp's), since their address is probably invalid | |
399 | now. | |
400 | ||
401 | And, we DON'T want to call delete_breakpoints() here, since | |
402 | that may write the bp's "shadow contents" (the instruction | |
403 | value that was overwritten witha TRAP instruction). Since | |
404 | we now have a new a.out, those shadow contents aren't valid. */ | |
405 | update_breakpoints_after_exec (); | |
406 | ||
407 | /* If there was one, it's gone now. We cannot truly step-to-next | |
408 | statement through an exec(). */ | |
409 | step_resume_breakpoint = NULL; | |
410 | step_range_start = 0; | |
411 | step_range_end = 0; | |
412 | ||
c906108c | 413 | /* What is this a.out's name? */ |
a3f17187 | 414 | printf_unfiltered (_("Executing new program: %s\n"), execd_pathname); |
c906108c SS |
415 | |
416 | /* We've followed the inferior through an exec. Therefore, the | |
417 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
418 | |
419 | /* First collect the run target in effect. */ | |
420 | tgt = find_run_target (); | |
421 | /* If we can't find one, things are in a very strange state... */ | |
422 | if (tgt == NULL) | |
8a3fe4f8 | 423 | error (_("Could find run target to save before following exec")); |
7a292a7a | 424 | |
c906108c SS |
425 | gdb_flush (gdb_stdout); |
426 | target_mourn_inferior (); | |
39f77062 | 427 | inferior_ptid = pid_to_ptid (saved_pid); |
488f131b | 428 | /* Because mourn_inferior resets inferior_ptid. */ |
7a292a7a | 429 | push_target (tgt); |
c906108c SS |
430 | |
431 | /* That a.out is now the one to use. */ | |
432 | exec_file_attach (execd_pathname, 0); | |
433 | ||
434 | /* And also is where symbols can be found. */ | |
1adeb98a | 435 | symbol_file_add_main (execd_pathname, 0); |
c906108c SS |
436 | |
437 | /* Reset the shared library package. This ensures that we get | |
438 | a shlib event when the child reaches "_start", at which point | |
439 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 440 | #if defined(SOLIB_RESTART) |
c906108c | 441 | SOLIB_RESTART (); |
7a292a7a SS |
442 | #endif |
443 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
39f77062 | 444 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
a77053c2 MK |
445 | #else |
446 | solib_create_inferior_hook (); | |
7a292a7a | 447 | #endif |
c906108c SS |
448 | |
449 | /* Reinsert all breakpoints. (Those which were symbolic have | |
450 | been reset to the proper address in the new a.out, thanks | |
451 | to symbol_file_command...) */ | |
452 | insert_breakpoints (); | |
453 | ||
454 | /* The next resume of this inferior should bring it to the shlib | |
455 | startup breakpoints. (If the user had also set bp's on | |
456 | "main" from the old (parent) process, then they'll auto- | |
457 | matically get reset there in the new process.) */ | |
c906108c SS |
458 | } |
459 | ||
460 | /* Non-zero if we just simulating a single-step. This is needed | |
461 | because we cannot remove the breakpoints in the inferior process | |
462 | until after the `wait' in `wait_for_inferior'. */ | |
463 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
464 | |
465 | /* The thread we inserted single-step breakpoints for. */ | |
466 | static ptid_t singlestep_ptid; | |
467 | ||
fd48f117 DJ |
468 | /* PC when we started this single-step. */ |
469 | static CORE_ADDR singlestep_pc; | |
470 | ||
9f976b41 DJ |
471 | /* If another thread hit the singlestep breakpoint, we save the original |
472 | thread here so that we can resume single-stepping it later. */ | |
473 | static ptid_t saved_singlestep_ptid; | |
474 | static int stepping_past_singlestep_breakpoint; | |
c906108c SS |
475 | \f |
476 | ||
477 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 478 | static void |
74b7792f | 479 | resume_cleanups (void *ignore) |
c906108c SS |
480 | { |
481 | normal_stop (); | |
482 | } | |
483 | ||
53904c9e AC |
484 | static const char schedlock_off[] = "off"; |
485 | static const char schedlock_on[] = "on"; | |
486 | static const char schedlock_step[] = "step"; | |
488f131b | 487 | static const char *scheduler_enums[] = { |
ef346e04 AC |
488 | schedlock_off, |
489 | schedlock_on, | |
490 | schedlock_step, | |
491 | NULL | |
492 | }; | |
920d2a44 AC |
493 | static const char *scheduler_mode = schedlock_off; |
494 | static void | |
495 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
496 | struct cmd_list_element *c, const char *value) | |
497 | { | |
498 | fprintf_filtered (file, _("\ | |
499 | Mode for locking scheduler during execution is \"%s\".\n"), | |
500 | value); | |
501 | } | |
c906108c SS |
502 | |
503 | static void | |
96baa820 | 504 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 505 | { |
eefe576e AC |
506 | if (!target_can_lock_scheduler) |
507 | { | |
508 | scheduler_mode = schedlock_off; | |
509 | error (_("Target '%s' cannot support this command."), target_shortname); | |
510 | } | |
c906108c SS |
511 | } |
512 | ||
513 | ||
514 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
515 | wants to interrupt some lengthy single-stepping operation | |
516 | (for child processes, the SIGINT goes to the inferior, and so | |
517 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
518 | other targets, that's not true). | |
519 | ||
520 | STEP nonzero if we should step (zero to continue instead). | |
521 | SIG is the signal to give the inferior (zero for none). */ | |
522 | void | |
96baa820 | 523 | resume (int step, enum target_signal sig) |
c906108c SS |
524 | { |
525 | int should_resume = 1; | |
74b7792f | 526 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
c906108c SS |
527 | QUIT; |
528 | ||
527159b7 | 529 | if (debug_infrun) |
8a9de0e4 AC |
530 | fprintf_unfiltered (gdb_stdlog, "infrun: resume (step=%d, signal=%d)\n", |
531 | step, sig); | |
527159b7 | 532 | |
ef5cf84e MS |
533 | /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */ |
534 | ||
c906108c | 535 | |
692590c1 MS |
536 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
537 | over an instruction that causes a page fault without triggering | |
538 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
539 | stop, because the hardware watchpoint is not triggered, but it forgets | |
540 | the step request and continues the program normally. | |
541 | Work around the problem by removing hardware watchpoints if a step is | |
542 | requested, GDB will check for a hardware watchpoint trigger after the | |
543 | step anyway. */ | |
544 | if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) | |
545 | remove_hw_watchpoints (); | |
488f131b | 546 | |
692590c1 | 547 | |
c2c6d25f JM |
548 | /* Normally, by the time we reach `resume', the breakpoints are either |
549 | removed or inserted, as appropriate. The exception is if we're sitting | |
550 | at a permanent breakpoint; we need to step over it, but permanent | |
551 | breakpoints can't be removed. So we have to test for it here. */ | |
552 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
553 | SKIP_PERMANENT_BREAKPOINT (); | |
554 | ||
b0ed3589 | 555 | if (SOFTWARE_SINGLE_STEP_P () && step) |
c906108c SS |
556 | { |
557 | /* Do it the hard way, w/temp breakpoints */ | |
c5aa993b | 558 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
c906108c SS |
559 | /* ...and don't ask hardware to do it. */ |
560 | step = 0; | |
561 | /* and do not pull these breakpoints until after a `wait' in | |
562 | `wait_for_inferior' */ | |
563 | singlestep_breakpoints_inserted_p = 1; | |
9f976b41 | 564 | singlestep_ptid = inferior_ptid; |
fd48f117 | 565 | singlestep_pc = read_pc (); |
c906108c SS |
566 | } |
567 | ||
c906108c | 568 | /* If there were any forks/vforks/execs that were caught and are |
6604731b | 569 | now to be followed, then do so. */ |
c906108c SS |
570 | switch (pending_follow.kind) |
571 | { | |
6604731b DJ |
572 | case TARGET_WAITKIND_FORKED: |
573 | case TARGET_WAITKIND_VFORKED: | |
c906108c | 574 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
6604731b DJ |
575 | if (follow_fork ()) |
576 | should_resume = 0; | |
c906108c SS |
577 | break; |
578 | ||
6604731b | 579 | case TARGET_WAITKIND_EXECD: |
c906108c | 580 | /* follow_exec is called as soon as the exec event is seen. */ |
6604731b | 581 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
c906108c SS |
582 | break; |
583 | ||
584 | default: | |
585 | break; | |
586 | } | |
c906108c SS |
587 | |
588 | /* Install inferior's terminal modes. */ | |
589 | target_terminal_inferior (); | |
590 | ||
591 | if (should_resume) | |
592 | { | |
39f77062 | 593 | ptid_t resume_ptid; |
dfcd3bfb | 594 | |
488f131b | 595 | resume_ptid = RESUME_ALL; /* Default */ |
ef5cf84e | 596 | |
8fb3e588 AC |
597 | if ((step || singlestep_breakpoints_inserted_p) |
598 | && (stepping_past_singlestep_breakpoint | |
599 | || (!breakpoints_inserted && breakpoint_here_p (read_pc ())))) | |
c906108c | 600 | { |
ef5cf84e MS |
601 | /* Stepping past a breakpoint without inserting breakpoints. |
602 | Make sure only the current thread gets to step, so that | |
603 | other threads don't sneak past breakpoints while they are | |
604 | not inserted. */ | |
c906108c | 605 | |
ef5cf84e | 606 | resume_ptid = inferior_ptid; |
c906108c | 607 | } |
ef5cf84e | 608 | |
8fb3e588 AC |
609 | if ((scheduler_mode == schedlock_on) |
610 | || (scheduler_mode == schedlock_step | |
611 | && (step || singlestep_breakpoints_inserted_p))) | |
c906108c | 612 | { |
ef5cf84e | 613 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 614 | resume_ptid = inferior_ptid; |
c906108c | 615 | } |
ef5cf84e | 616 | |
c4ed33b9 AC |
617 | if (CANNOT_STEP_BREAKPOINT) |
618 | { | |
619 | /* Most targets can step a breakpoint instruction, thus | |
620 | executing it normally. But if this one cannot, just | |
621 | continue and we will hit it anyway. */ | |
622 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
623 | step = 0; | |
624 | } | |
39f77062 | 625 | target_resume (resume_ptid, step, sig); |
c906108c SS |
626 | } |
627 | ||
628 | discard_cleanups (old_cleanups); | |
629 | } | |
630 | \f | |
631 | ||
632 | /* Clear out all variables saying what to do when inferior is continued. | |
633 | First do this, then set the ones you want, then call `proceed'. */ | |
634 | ||
635 | void | |
96baa820 | 636 | clear_proceed_status (void) |
c906108c SS |
637 | { |
638 | trap_expected = 0; | |
639 | step_range_start = 0; | |
640 | step_range_end = 0; | |
aa0cd9c1 | 641 | step_frame_id = null_frame_id; |
5fbbeb29 | 642 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c | 643 | stop_after_trap = 0; |
c0236d92 | 644 | stop_soon = NO_STOP_QUIETLY; |
c906108c SS |
645 | proceed_to_finish = 0; |
646 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
647 | ||
648 | /* Discard any remaining commands or status from previous stop. */ | |
649 | bpstat_clear (&stop_bpstat); | |
650 | } | |
651 | ||
ea67f13b DJ |
652 | /* This should be suitable for any targets that support threads. */ |
653 | ||
654 | static int | |
655 | prepare_to_proceed (void) | |
656 | { | |
657 | ptid_t wait_ptid; | |
658 | struct target_waitstatus wait_status; | |
659 | ||
660 | /* Get the last target status returned by target_wait(). */ | |
661 | get_last_target_status (&wait_ptid, &wait_status); | |
662 | ||
663 | /* Make sure we were stopped either at a breakpoint, or because | |
664 | of a Ctrl-C. */ | |
665 | if (wait_status.kind != TARGET_WAITKIND_STOPPED | |
8fb3e588 AC |
666 | || (wait_status.value.sig != TARGET_SIGNAL_TRAP |
667 | && wait_status.value.sig != TARGET_SIGNAL_INT)) | |
ea67f13b DJ |
668 | { |
669 | return 0; | |
670 | } | |
671 | ||
672 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
673 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
674 | { | |
675 | /* Switched over from WAIT_PID. */ | |
676 | CORE_ADDR wait_pc = read_pc_pid (wait_ptid); | |
677 | ||
678 | if (wait_pc != read_pc ()) | |
679 | { | |
680 | /* Switch back to WAIT_PID thread. */ | |
681 | inferior_ptid = wait_ptid; | |
682 | ||
683 | /* FIXME: This stuff came from switch_to_thread() in | |
684 | thread.c (which should probably be a public function). */ | |
35f196d9 | 685 | reinit_frame_cache (); |
ea67f13b DJ |
686 | registers_changed (); |
687 | stop_pc = wait_pc; | |
ea67f13b DJ |
688 | } |
689 | ||
8fb3e588 AC |
690 | /* We return 1 to indicate that there is a breakpoint here, |
691 | so we need to step over it before continuing to avoid | |
692 | hitting it straight away. */ | |
693 | if (breakpoint_here_p (wait_pc)) | |
694 | return 1; | |
ea67f13b DJ |
695 | } |
696 | ||
697 | return 0; | |
8fb3e588 | 698 | |
ea67f13b | 699 | } |
e4846b08 JJ |
700 | |
701 | /* Record the pc of the program the last time it stopped. This is | |
702 | just used internally by wait_for_inferior, but need to be preserved | |
703 | over calls to it and cleared when the inferior is started. */ | |
704 | static CORE_ADDR prev_pc; | |
705 | ||
c906108c SS |
706 | /* Basic routine for continuing the program in various fashions. |
707 | ||
708 | ADDR is the address to resume at, or -1 for resume where stopped. | |
709 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 710 | or -1 for act according to how it stopped. |
c906108c | 711 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
712 | -1 means return after that and print nothing. |
713 | You should probably set various step_... variables | |
714 | before calling here, if you are stepping. | |
c906108c SS |
715 | |
716 | You should call clear_proceed_status before calling proceed. */ | |
717 | ||
718 | void | |
96baa820 | 719 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
720 | { |
721 | int oneproc = 0; | |
722 | ||
723 | if (step > 0) | |
724 | step_start_function = find_pc_function (read_pc ()); | |
725 | if (step < 0) | |
726 | stop_after_trap = 1; | |
727 | ||
2acceee2 | 728 | if (addr == (CORE_ADDR) -1) |
c906108c | 729 | { |
c906108c | 730 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) |
3352ef37 AC |
731 | /* There is a breakpoint at the address we will resume at, |
732 | step one instruction before inserting breakpoints so that | |
733 | we do not stop right away (and report a second hit at this | |
734 | breakpoint). */ | |
c906108c | 735 | oneproc = 1; |
3352ef37 AC |
736 | else if (gdbarch_single_step_through_delay_p (current_gdbarch) |
737 | && gdbarch_single_step_through_delay (current_gdbarch, | |
738 | get_current_frame ())) | |
739 | /* We stepped onto an instruction that needs to be stepped | |
740 | again before re-inserting the breakpoint, do so. */ | |
c906108c SS |
741 | oneproc = 1; |
742 | } | |
743 | else | |
744 | { | |
745 | write_pc (addr); | |
c906108c SS |
746 | } |
747 | ||
527159b7 | 748 | if (debug_infrun) |
8a9de0e4 AC |
749 | fprintf_unfiltered (gdb_stdlog, |
750 | "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n", | |
751 | paddr_nz (addr), siggnal, step); | |
527159b7 | 752 | |
c906108c SS |
753 | /* In a multi-threaded task we may select another thread |
754 | and then continue or step. | |
755 | ||
756 | But if the old thread was stopped at a breakpoint, it | |
757 | will immediately cause another breakpoint stop without | |
758 | any execution (i.e. it will report a breakpoint hit | |
759 | incorrectly). So we must step over it first. | |
760 | ||
ea67f13b | 761 | prepare_to_proceed checks the current thread against the thread |
c906108c SS |
762 | that reported the most recent event. If a step-over is required |
763 | it returns TRUE and sets the current thread to the old thread. */ | |
ea67f13b DJ |
764 | if (prepare_to_proceed () && breakpoint_here_p (read_pc ())) |
765 | oneproc = 1; | |
c906108c | 766 | |
c906108c SS |
767 | if (oneproc) |
768 | /* We will get a trace trap after one instruction. | |
769 | Continue it automatically and insert breakpoints then. */ | |
770 | trap_expected = 1; | |
771 | else | |
772 | { | |
81d0cc19 GS |
773 | insert_breakpoints (); |
774 | /* If we get here there was no call to error() in | |
8fb3e588 | 775 | insert breakpoints -- so they were inserted. */ |
c906108c SS |
776 | breakpoints_inserted = 1; |
777 | } | |
778 | ||
779 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
780 | stop_signal = siggnal; | |
781 | /* If this signal should not be seen by program, | |
782 | give it zero. Used for debugging signals. */ | |
783 | else if (!signal_program[stop_signal]) | |
784 | stop_signal = TARGET_SIGNAL_0; | |
785 | ||
786 | annotate_starting (); | |
787 | ||
788 | /* Make sure that output from GDB appears before output from the | |
789 | inferior. */ | |
790 | gdb_flush (gdb_stdout); | |
791 | ||
e4846b08 JJ |
792 | /* Refresh prev_pc value just prior to resuming. This used to be |
793 | done in stop_stepping, however, setting prev_pc there did not handle | |
794 | scenarios such as inferior function calls or returning from | |
795 | a function via the return command. In those cases, the prev_pc | |
796 | value was not set properly for subsequent commands. The prev_pc value | |
797 | is used to initialize the starting line number in the ecs. With an | |
798 | invalid value, the gdb next command ends up stopping at the position | |
799 | represented by the next line table entry past our start position. | |
800 | On platforms that generate one line table entry per line, this | |
801 | is not a problem. However, on the ia64, the compiler generates | |
802 | extraneous line table entries that do not increase the line number. | |
803 | When we issue the gdb next command on the ia64 after an inferior call | |
804 | or a return command, we often end up a few instructions forward, still | |
805 | within the original line we started. | |
806 | ||
807 | An attempt was made to have init_execution_control_state () refresh | |
808 | the prev_pc value before calculating the line number. This approach | |
809 | did not work because on platforms that use ptrace, the pc register | |
810 | cannot be read unless the inferior is stopped. At that point, we | |
811 | are not guaranteed the inferior is stopped and so the read_pc () | |
812 | call can fail. Setting the prev_pc value here ensures the value is | |
8fb3e588 | 813 | updated correctly when the inferior is stopped. */ |
e4846b08 JJ |
814 | prev_pc = read_pc (); |
815 | ||
c906108c SS |
816 | /* Resume inferior. */ |
817 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
818 | ||
819 | /* Wait for it to stop (if not standalone) | |
820 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
821 | /* Do this only if we are not using the event loop, or if the target |
822 | does not support asynchronous execution. */ | |
362646f5 | 823 | if (!target_can_async_p ()) |
43ff13b4 JM |
824 | { |
825 | wait_for_inferior (); | |
826 | normal_stop (); | |
827 | } | |
c906108c | 828 | } |
c906108c SS |
829 | \f |
830 | ||
831 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 832 | |
c906108c | 833 | void |
8621d6a9 | 834 | start_remote (int from_tty) |
c906108c SS |
835 | { |
836 | init_thread_list (); | |
837 | init_wait_for_inferior (); | |
c0236d92 | 838 | stop_soon = STOP_QUIETLY; |
c906108c | 839 | trap_expected = 0; |
43ff13b4 | 840 | |
6426a772 JM |
841 | /* Always go on waiting for the target, regardless of the mode. */ |
842 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 843 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
844 | nothing is returned (instead of just blocking). Because of this, |
845 | targets expecting an immediate response need to, internally, set | |
846 | things up so that the target_wait() is forced to eventually | |
847 | timeout. */ | |
848 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
849 | differentiate to its caller what the state of the target is after | |
850 | the initial open has been performed. Here we're assuming that | |
851 | the target has stopped. It should be possible to eventually have | |
852 | target_open() return to the caller an indication that the target | |
853 | is currently running and GDB state should be set to the same as | |
854 | for an async run. */ | |
855 | wait_for_inferior (); | |
8621d6a9 DJ |
856 | |
857 | /* Now that the inferior has stopped, do any bookkeeping like | |
858 | loading shared libraries. We want to do this before normal_stop, | |
859 | so that the displayed frame is up to date. */ | |
860 | post_create_inferior (¤t_target, from_tty); | |
861 | ||
6426a772 | 862 | normal_stop (); |
c906108c SS |
863 | } |
864 | ||
865 | /* Initialize static vars when a new inferior begins. */ | |
866 | ||
867 | void | |
96baa820 | 868 | init_wait_for_inferior (void) |
c906108c SS |
869 | { |
870 | /* These are meaningless until the first time through wait_for_inferior. */ | |
871 | prev_pc = 0; | |
c906108c | 872 | |
c906108c SS |
873 | breakpoints_inserted = 0; |
874 | breakpoint_init_inferior (inf_starting); | |
875 | ||
876 | /* Don't confuse first call to proceed(). */ | |
877 | stop_signal = TARGET_SIGNAL_0; | |
878 | ||
879 | /* The first resume is not following a fork/vfork/exec. */ | |
880 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
c906108c | 881 | |
c906108c | 882 | clear_proceed_status (); |
9f976b41 DJ |
883 | |
884 | stepping_past_singlestep_breakpoint = 0; | |
c906108c | 885 | } |
c906108c | 886 | \f |
b83266a0 SS |
887 | /* This enum encodes possible reasons for doing a target_wait, so that |
888 | wfi can call target_wait in one place. (Ultimately the call will be | |
889 | moved out of the infinite loop entirely.) */ | |
890 | ||
c5aa993b JM |
891 | enum infwait_states |
892 | { | |
cd0fc7c3 SS |
893 | infwait_normal_state, |
894 | infwait_thread_hop_state, | |
cd0fc7c3 | 895 | infwait_nonstep_watch_state |
b83266a0 SS |
896 | }; |
897 | ||
11cf8741 JM |
898 | /* Why did the inferior stop? Used to print the appropriate messages |
899 | to the interface from within handle_inferior_event(). */ | |
900 | enum inferior_stop_reason | |
901 | { | |
11cf8741 JM |
902 | /* Step, next, nexti, stepi finished. */ |
903 | END_STEPPING_RANGE, | |
11cf8741 JM |
904 | /* Inferior terminated by signal. */ |
905 | SIGNAL_EXITED, | |
906 | /* Inferior exited. */ | |
907 | EXITED, | |
908 | /* Inferior received signal, and user asked to be notified. */ | |
909 | SIGNAL_RECEIVED | |
910 | }; | |
911 | ||
cd0fc7c3 SS |
912 | /* This structure contains what used to be local variables in |
913 | wait_for_inferior. Probably many of them can return to being | |
914 | locals in handle_inferior_event. */ | |
915 | ||
c5aa993b | 916 | struct execution_control_state |
488f131b JB |
917 | { |
918 | struct target_waitstatus ws; | |
919 | struct target_waitstatus *wp; | |
920 | int another_trap; | |
921 | int random_signal; | |
922 | CORE_ADDR stop_func_start; | |
923 | CORE_ADDR stop_func_end; | |
924 | char *stop_func_name; | |
925 | struct symtab_and_line sal; | |
488f131b JB |
926 | int current_line; |
927 | struct symtab *current_symtab; | |
928 | int handling_longjmp; /* FIXME */ | |
929 | ptid_t ptid; | |
930 | ptid_t saved_inferior_ptid; | |
68f53502 | 931 | int step_after_step_resume_breakpoint; |
488f131b JB |
932 | int stepping_through_solib_after_catch; |
933 | bpstat stepping_through_solib_catchpoints; | |
488f131b JB |
934 | int new_thread_event; |
935 | struct target_waitstatus tmpstatus; | |
936 | enum infwait_states infwait_state; | |
937 | ptid_t waiton_ptid; | |
938 | int wait_some_more; | |
939 | }; | |
940 | ||
941 | void init_execution_control_state (struct execution_control_state *ecs); | |
942 | ||
943 | void handle_inferior_event (struct execution_control_state *ecs); | |
cd0fc7c3 | 944 | |
c2c6d25f | 945 | static void step_into_function (struct execution_control_state *ecs); |
44cbf7b5 | 946 | static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame); |
14e60db5 | 947 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); |
44cbf7b5 AC |
948 | static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, |
949 | struct frame_id sr_id); | |
104c1213 JM |
950 | static void stop_stepping (struct execution_control_state *ecs); |
951 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 952 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
953 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
954 | int stop_info); | |
104c1213 | 955 | |
cd0fc7c3 SS |
956 | /* Wait for control to return from inferior to debugger. |
957 | If inferior gets a signal, we may decide to start it up again | |
958 | instead of returning. That is why there is a loop in this function. | |
959 | When this function actually returns it means the inferior | |
960 | should be left stopped and GDB should read more commands. */ | |
961 | ||
962 | void | |
96baa820 | 963 | wait_for_inferior (void) |
cd0fc7c3 SS |
964 | { |
965 | struct cleanup *old_cleanups; | |
966 | struct execution_control_state ecss; | |
967 | struct execution_control_state *ecs; | |
c906108c | 968 | |
527159b7 | 969 | if (debug_infrun) |
8a9de0e4 | 970 | fprintf_unfiltered (gdb_stdlog, "infrun: wait_for_inferior\n"); |
527159b7 | 971 | |
8601f500 | 972 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c | 973 | &step_resume_breakpoint); |
cd0fc7c3 SS |
974 | |
975 | /* wfi still stays in a loop, so it's OK just to take the address of | |
976 | a local to get the ecs pointer. */ | |
977 | ecs = &ecss; | |
978 | ||
979 | /* Fill in with reasonable starting values. */ | |
980 | init_execution_control_state (ecs); | |
981 | ||
c906108c | 982 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 983 | previous_inferior_ptid = inferior_ptid; |
c906108c | 984 | |
cd0fc7c3 SS |
985 | overlay_cache_invalid = 1; |
986 | ||
987 | /* We have to invalidate the registers BEFORE calling target_wait | |
988 | because they can be loaded from the target while in target_wait. | |
989 | This makes remote debugging a bit more efficient for those | |
990 | targets that provide critical registers as part of their normal | |
991 | status mechanism. */ | |
992 | ||
993 | registers_changed (); | |
b83266a0 | 994 | |
c906108c SS |
995 | while (1) |
996 | { | |
9a4105ab AC |
997 | if (deprecated_target_wait_hook) |
998 | ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp); | |
cd0fc7c3 | 999 | else |
39f77062 | 1000 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
c906108c | 1001 | |
cd0fc7c3 SS |
1002 | /* Now figure out what to do with the result of the result. */ |
1003 | handle_inferior_event (ecs); | |
c906108c | 1004 | |
cd0fc7c3 SS |
1005 | if (!ecs->wait_some_more) |
1006 | break; | |
1007 | } | |
1008 | do_cleanups (old_cleanups); | |
1009 | } | |
c906108c | 1010 | |
43ff13b4 JM |
1011 | /* Asynchronous version of wait_for_inferior. It is called by the |
1012 | event loop whenever a change of state is detected on the file | |
1013 | descriptor corresponding to the target. It can be called more than | |
1014 | once to complete a single execution command. In such cases we need | |
1015 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1016 | last time that this function is called for a single execution | |
1017 | command, then report to the user that the inferior has stopped, and | |
1018 | do the necessary cleanups. */ | |
1019 | ||
1020 | struct execution_control_state async_ecss; | |
1021 | struct execution_control_state *async_ecs; | |
1022 | ||
1023 | void | |
fba45db2 | 1024 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1025 | { |
1026 | static struct cleanup *old_cleanups; | |
1027 | ||
c5aa993b | 1028 | async_ecs = &async_ecss; |
43ff13b4 JM |
1029 | |
1030 | if (!async_ecs->wait_some_more) | |
1031 | { | |
488f131b | 1032 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
c5aa993b | 1033 | &step_resume_breakpoint); |
43ff13b4 JM |
1034 | |
1035 | /* Fill in with reasonable starting values. */ | |
1036 | init_execution_control_state (async_ecs); | |
1037 | ||
43ff13b4 | 1038 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1039 | previous_inferior_ptid = inferior_ptid; |
43ff13b4 JM |
1040 | |
1041 | overlay_cache_invalid = 1; | |
1042 | ||
1043 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1044 | because they can be loaded from the target while in target_wait. |
1045 | This makes remote debugging a bit more efficient for those | |
1046 | targets that provide critical registers as part of their normal | |
1047 | status mechanism. */ | |
43ff13b4 JM |
1048 | |
1049 | registers_changed (); | |
1050 | } | |
1051 | ||
9a4105ab | 1052 | if (deprecated_target_wait_hook) |
488f131b | 1053 | async_ecs->ptid = |
9a4105ab | 1054 | deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 | 1055 | else |
39f77062 | 1056 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 JM |
1057 | |
1058 | /* Now figure out what to do with the result of the result. */ | |
1059 | handle_inferior_event (async_ecs); | |
1060 | ||
1061 | if (!async_ecs->wait_some_more) | |
1062 | { | |
adf40b2e | 1063 | /* Do only the cleanups that have been added by this |
488f131b JB |
1064 | function. Let the continuations for the commands do the rest, |
1065 | if there are any. */ | |
43ff13b4 JM |
1066 | do_exec_cleanups (old_cleanups); |
1067 | normal_stop (); | |
c2d11a7d JM |
1068 | if (step_multi && stop_step) |
1069 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1070 | else | |
1071 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1072 | } |
1073 | } | |
1074 | ||
cd0fc7c3 SS |
1075 | /* Prepare an execution control state for looping through a |
1076 | wait_for_inferior-type loop. */ | |
1077 | ||
1078 | void | |
96baa820 | 1079 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1080 | { |
6ad80df0 | 1081 | ecs->another_trap = 0; |
cd0fc7c3 | 1082 | ecs->random_signal = 0; |
68f53502 | 1083 | ecs->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 | 1084 | ecs->handling_longjmp = 0; /* FIXME */ |
cd0fc7c3 SS |
1085 | ecs->stepping_through_solib_after_catch = 0; |
1086 | ecs->stepping_through_solib_catchpoints = NULL; | |
cd0fc7c3 SS |
1087 | ecs->sal = find_pc_line (prev_pc, 0); |
1088 | ecs->current_line = ecs->sal.line; | |
1089 | ecs->current_symtab = ecs->sal.symtab; | |
1090 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1091 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1092 | ecs->wp = &(ecs->ws); |
1093 | } | |
1094 | ||
e02bc4cc | 1095 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
1096 | target_wait()/deprecated_target_wait_hook(). The data is actually |
1097 | cached by handle_inferior_event(), which gets called immediately | |
1098 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
1099 | |
1100 | void | |
488f131b | 1101 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1102 | { |
39f77062 | 1103 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1104 | *status = target_last_waitstatus; |
1105 | } | |
1106 | ||
ac264b3b MS |
1107 | void |
1108 | nullify_last_target_wait_ptid (void) | |
1109 | { | |
1110 | target_last_wait_ptid = minus_one_ptid; | |
1111 | } | |
1112 | ||
dd80620e MS |
1113 | /* Switch thread contexts, maintaining "infrun state". */ |
1114 | ||
1115 | static void | |
1116 | context_switch (struct execution_control_state *ecs) | |
1117 | { | |
1118 | /* Caution: it may happen that the new thread (or the old one!) | |
1119 | is not in the thread list. In this case we must not attempt | |
1120 | to "switch context", or we run the risk that our context may | |
1121 | be lost. This may happen as a result of the target module | |
1122 | mishandling thread creation. */ | |
1123 | ||
fd48f117 DJ |
1124 | if (debug_infrun) |
1125 | { | |
1126 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
1127 | target_pid_to_str (inferior_ptid)); | |
1128 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
1129 | target_pid_to_str (ecs->ptid)); | |
1130 | } | |
1131 | ||
dd80620e | 1132 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) |
488f131b | 1133 | { /* Perform infrun state context switch: */ |
dd80620e | 1134 | /* Save infrun state for the old thread. */ |
0ce3d317 | 1135 | save_infrun_state (inferior_ptid, prev_pc, |
dd80620e | 1136 | trap_expected, step_resume_breakpoint, |
15960608 | 1137 | step_range_start, |
aa0cd9c1 | 1138 | step_range_end, &step_frame_id, |
dd80620e MS |
1139 | ecs->handling_longjmp, ecs->another_trap, |
1140 | ecs->stepping_through_solib_after_catch, | |
1141 | ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1142 | ecs->current_line, ecs->current_symtab); |
dd80620e MS |
1143 | |
1144 | /* Load infrun state for the new thread. */ | |
0ce3d317 | 1145 | load_infrun_state (ecs->ptid, &prev_pc, |
dd80620e | 1146 | &trap_expected, &step_resume_breakpoint, |
15960608 | 1147 | &step_range_start, |
aa0cd9c1 | 1148 | &step_range_end, &step_frame_id, |
dd80620e MS |
1149 | &ecs->handling_longjmp, &ecs->another_trap, |
1150 | &ecs->stepping_through_solib_after_catch, | |
1151 | &ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1152 | &ecs->current_line, &ecs->current_symtab); |
dd80620e MS |
1153 | } |
1154 | inferior_ptid = ecs->ptid; | |
35f196d9 | 1155 | reinit_frame_cache (); |
dd80620e MS |
1156 | } |
1157 | ||
4fa8626c DJ |
1158 | static void |
1159 | adjust_pc_after_break (struct execution_control_state *ecs) | |
1160 | { | |
8aad930b | 1161 | CORE_ADDR breakpoint_pc; |
4fa8626c DJ |
1162 | |
1163 | /* If this target does not decrement the PC after breakpoints, then | |
1164 | we have nothing to do. */ | |
1165 | if (DECR_PC_AFTER_BREAK == 0) | |
1166 | return; | |
1167 | ||
1168 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If | |
1169 | we aren't, just return. | |
9709f61c DJ |
1170 | |
1171 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
1172 | affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented | |
1173 | by software breakpoints should be handled through the normal breakpoint | |
1174 | layer. | |
8fb3e588 | 1175 | |
4fa8626c DJ |
1176 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
1177 | different signals (SIGILL or SIGEMT for instance), but it is less | |
1178 | clear where the PC is pointing afterwards. It may not match | |
1179 | DECR_PC_AFTER_BREAK. I don't know any specific target that generates | |
1180 | these signals at breakpoints (the code has been in GDB since at least | |
1181 | 1992) so I can not guess how to handle them here. | |
8fb3e588 | 1182 | |
4fa8626c DJ |
1183 | In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS |
1184 | would have the PC after hitting a watchpoint affected by | |
1185 | DECR_PC_AFTER_BREAK. I haven't found any target with both of these set | |
1186 | in GDB history, and it seems unlikely to be correct, so | |
1187 | HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */ | |
1188 | ||
1189 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
1190 | return; | |
1191 | ||
1192 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
1193 | return; | |
1194 | ||
8aad930b AC |
1195 | /* Find the location where (if we've hit a breakpoint) the |
1196 | breakpoint would be. */ | |
1197 | breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK; | |
1198 | ||
1199 | if (SOFTWARE_SINGLE_STEP_P ()) | |
1200 | { | |
1201 | /* When using software single-step, a SIGTRAP can only indicate | |
8fb3e588 AC |
1202 | an inserted breakpoint. This actually makes things |
1203 | easier. */ | |
8aad930b AC |
1204 | if (singlestep_breakpoints_inserted_p) |
1205 | /* When software single stepping, the instruction at [prev_pc] | |
1206 | is never a breakpoint, but the instruction following | |
1207 | [prev_pc] (in program execution order) always is. Assume | |
1208 | that following instruction was reached and hence a software | |
1209 | breakpoint was hit. */ | |
1210 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1211 | else if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1212 | /* The inferior was free running (i.e., no single-step | |
1213 | breakpoints inserted) and it hit a software breakpoint. */ | |
1214 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1215 | } | |
1216 | else | |
1217 | { | |
1218 | /* When using hardware single-step, a SIGTRAP is reported for | |
8fb3e588 AC |
1219 | both a completed single-step and a software breakpoint. Need |
1220 | to differentiate between the two as the latter needs | |
90225438 AS |
1221 | adjusting but the former does not. |
1222 | ||
1223 | When the thread to be examined does not match the current thread | |
1224 | context we can't use currently_stepping, so assume no | |
1225 | single-stepping in this case. */ | |
1226 | if (ptid_equal (ecs->ptid, inferior_ptid) && currently_stepping (ecs)) | |
8aad930b AC |
1227 | { |
1228 | if (prev_pc == breakpoint_pc | |
1229 | && software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1230 | /* Hardware single-stepped a software breakpoint (as | |
1231 | occures when the inferior is resumed with PC pointing | |
1232 | at not-yet-hit software breakpoint). Since the | |
1233 | breakpoint really is executed, the inferior needs to be | |
1234 | backed up to the breakpoint address. */ | |
1235 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1236 | } | |
1237 | else | |
1238 | { | |
1239 | if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1240 | /* The inferior was free running (i.e., no hardware | |
1241 | single-step and no possibility of a false SIGTRAP) and | |
1242 | hit a software breakpoint. */ | |
1243 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1244 | } | |
1245 | } | |
4fa8626c DJ |
1246 | } |
1247 | ||
cd0fc7c3 SS |
1248 | /* Given an execution control state that has been freshly filled in |
1249 | by an event from the inferior, figure out what it means and take | |
1250 | appropriate action. */ | |
c906108c | 1251 | |
7270d8f2 OF |
1252 | int stepped_after_stopped_by_watchpoint; |
1253 | ||
cd0fc7c3 | 1254 | void |
96baa820 | 1255 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 1256 | { |
8bbde302 BE |
1257 | /* NOTE: bje/2005-05-02: If you're looking at this code and thinking |
1258 | that the variable stepped_after_stopped_by_watchpoint isn't used, | |
1259 | then you're wrong! See remote.c:remote_stopped_data_address. */ | |
1260 | ||
c8edd8b4 | 1261 | int sw_single_step_trap_p = 0; |
8fb3e588 | 1262 | int stopped_by_watchpoint = -1; /* Mark as unknown. */ |
cd0fc7c3 | 1263 | |
e02bc4cc | 1264 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1265 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1266 | target_last_waitstatus = *ecs->wp; |
1267 | ||
4fa8626c DJ |
1268 | adjust_pc_after_break (ecs); |
1269 | ||
488f131b JB |
1270 | switch (ecs->infwait_state) |
1271 | { | |
1272 | case infwait_thread_hop_state: | |
527159b7 | 1273 | if (debug_infrun) |
8a9de0e4 | 1274 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); |
488f131b JB |
1275 | /* Cancel the waiton_ptid. */ |
1276 | ecs->waiton_ptid = pid_to_ptid (-1); | |
65e82032 | 1277 | break; |
b83266a0 | 1278 | |
488f131b | 1279 | case infwait_normal_state: |
527159b7 | 1280 | if (debug_infrun) |
8a9de0e4 | 1281 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
488f131b JB |
1282 | stepped_after_stopped_by_watchpoint = 0; |
1283 | break; | |
b83266a0 | 1284 | |
488f131b | 1285 | case infwait_nonstep_watch_state: |
527159b7 | 1286 | if (debug_infrun) |
8a9de0e4 AC |
1287 | fprintf_unfiltered (gdb_stdlog, |
1288 | "infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 1289 | insert_breakpoints (); |
c906108c | 1290 | |
488f131b JB |
1291 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1292 | handle things like signals arriving and other things happening | |
1293 | in combination correctly? */ | |
1294 | stepped_after_stopped_by_watchpoint = 1; | |
1295 | break; | |
65e82032 AC |
1296 | |
1297 | default: | |
e2e0b3e5 | 1298 | internal_error (__FILE__, __LINE__, _("bad switch")); |
488f131b JB |
1299 | } |
1300 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1301 | |
35f196d9 | 1302 | reinit_frame_cache (); |
c906108c | 1303 | |
488f131b | 1304 | /* If it's a new process, add it to the thread database */ |
c906108c | 1305 | |
488f131b | 1306 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
b9b5d7ea | 1307 | && !ptid_equal (ecs->ptid, minus_one_ptid) |
488f131b JB |
1308 | && !in_thread_list (ecs->ptid)); |
1309 | ||
1310 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1311 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1312 | { | |
1313 | add_thread (ecs->ptid); | |
c906108c | 1314 | |
488f131b JB |
1315 | ui_out_text (uiout, "[New "); |
1316 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); | |
1317 | ui_out_text (uiout, "]\n"); | |
488f131b | 1318 | } |
c906108c | 1319 | |
488f131b JB |
1320 | switch (ecs->ws.kind) |
1321 | { | |
1322 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 1323 | if (debug_infrun) |
8a9de0e4 | 1324 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
488f131b JB |
1325 | /* Ignore gracefully during startup of the inferior, as it |
1326 | might be the shell which has just loaded some objects, | |
1327 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1328 | #ifdef SOLIB_ADD |
c0236d92 | 1329 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b JB |
1330 | { |
1331 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1332 | breakpoint addresses via breakpoint_re_set. */ | |
1333 | if (breakpoints_inserted) | |
1334 | remove_breakpoints (); | |
c906108c | 1335 | |
488f131b JB |
1336 | /* Check for any newly added shared libraries if we're |
1337 | supposed to be adding them automatically. Switch | |
1338 | terminal for any messages produced by | |
1339 | breakpoint_re_set. */ | |
1340 | target_terminal_ours_for_output (); | |
aff6338a | 1341 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
1342 | stack's section table is kept up-to-date. Architectures, |
1343 | (e.g., PPC64), use the section table to perform | |
1344 | operations such as address => section name and hence | |
1345 | require the table to contain all sections (including | |
1346 | those found in shared libraries). */ | |
aff6338a | 1347 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
1348 | exec_ops to SOLIB_ADD. This is because current GDB is |
1349 | only tooled to propagate section_table changes out from | |
1350 | the "current_target" (see target_resize_to_sections), and | |
1351 | not up from the exec stratum. This, of course, isn't | |
1352 | right. "infrun.c" should only interact with the | |
1353 | exec/process stratum, instead relying on the target stack | |
1354 | to propagate relevant changes (stop, section table | |
1355 | changed, ...) up to other layers. */ | |
aff6338a | 1356 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
488f131b JB |
1357 | target_terminal_inferior (); |
1358 | ||
1359 | /* Reinsert breakpoints and continue. */ | |
1360 | if (breakpoints_inserted) | |
1361 | insert_breakpoints (); | |
1362 | } | |
c906108c | 1363 | #endif |
488f131b JB |
1364 | resume (0, TARGET_SIGNAL_0); |
1365 | prepare_to_wait (ecs); | |
1366 | return; | |
c5aa993b | 1367 | |
488f131b | 1368 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 1369 | if (debug_infrun) |
8a9de0e4 | 1370 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
488f131b JB |
1371 | resume (0, TARGET_SIGNAL_0); |
1372 | prepare_to_wait (ecs); | |
1373 | return; | |
c5aa993b | 1374 | |
488f131b | 1375 | case TARGET_WAITKIND_EXITED: |
527159b7 | 1376 | if (debug_infrun) |
8a9de0e4 | 1377 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n"); |
488f131b JB |
1378 | target_terminal_ours (); /* Must do this before mourn anyway */ |
1379 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
1380 | ||
1381 | /* Record the exit code in the convenience variable $_exitcode, so | |
1382 | that the user can inspect this again later. */ | |
1383 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1384 | value_from_longest (builtin_type_int, | |
1385 | (LONGEST) ecs->ws.value.integer)); | |
1386 | gdb_flush (gdb_stdout); | |
1387 | target_mourn_inferior (); | |
1388 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1389 | stop_print_frame = 0; | |
1390 | stop_stepping (ecs); | |
1391 | return; | |
c5aa993b | 1392 | |
488f131b | 1393 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 1394 | if (debug_infrun) |
8a9de0e4 | 1395 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n"); |
488f131b JB |
1396 | stop_print_frame = 0; |
1397 | stop_signal = ecs->ws.value.sig; | |
1398 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1399 | |
488f131b JB |
1400 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1401 | reach here unless the inferior is dead. However, for years | |
1402 | target_kill() was called here, which hints that fatal signals aren't | |
1403 | really fatal on some systems. If that's true, then some changes | |
1404 | may be needed. */ | |
1405 | target_mourn_inferior (); | |
c906108c | 1406 | |
488f131b JB |
1407 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
1408 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1409 | stop_stepping (ecs); | |
1410 | return; | |
c906108c | 1411 | |
488f131b JB |
1412 | /* The following are the only cases in which we keep going; |
1413 | the above cases end in a continue or goto. */ | |
1414 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 1415 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 1416 | if (debug_infrun) |
8a9de0e4 | 1417 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); |
488f131b JB |
1418 | stop_signal = TARGET_SIGNAL_TRAP; |
1419 | pending_follow.kind = ecs->ws.kind; | |
1420 | ||
8e7d2c16 DJ |
1421 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
1422 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c | 1423 | |
5a2901d9 DJ |
1424 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
1425 | { | |
1426 | context_switch (ecs); | |
35f196d9 | 1427 | reinit_frame_cache (); |
5a2901d9 DJ |
1428 | } |
1429 | ||
488f131b | 1430 | stop_pc = read_pc (); |
675bf4cb | 1431 | |
00d4360e | 1432 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1433 | |
488f131b | 1434 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
04e68871 DJ |
1435 | |
1436 | /* If no catchpoint triggered for this, then keep going. */ | |
1437 | if (ecs->random_signal) | |
1438 | { | |
1439 | stop_signal = TARGET_SIGNAL_0; | |
1440 | keep_going (ecs); | |
1441 | return; | |
1442 | } | |
488f131b JB |
1443 | goto process_event_stop_test; |
1444 | ||
1445 | case TARGET_WAITKIND_EXECD: | |
527159b7 | 1446 | if (debug_infrun) |
fc5261f2 | 1447 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b JB |
1448 | stop_signal = TARGET_SIGNAL_TRAP; |
1449 | ||
7d2830a3 | 1450 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
8fb3e588 AC |
1451 | target_wait function. Until then following vfork on HP/UX 10.20 |
1452 | is probably broken by this. Of course, it's broken anyway. */ | |
488f131b JB |
1453 | /* Is this a target which reports multiple exec events per actual |
1454 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1455 | ignore all but the last one. Just resume the exec'r, and wait | |
1456 | for the next exec event. */ | |
1457 | if (inferior_ignoring_leading_exec_events) | |
1458 | { | |
1459 | inferior_ignoring_leading_exec_events--; | |
488f131b JB |
1460 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); |
1461 | prepare_to_wait (ecs); | |
1462 | return; | |
1463 | } | |
1464 | inferior_ignoring_leading_exec_events = | |
1465 | target_reported_exec_events_per_exec_call () - 1; | |
1466 | ||
1467 | pending_follow.execd_pathname = | |
1468 | savestring (ecs->ws.value.execd_pathname, | |
1469 | strlen (ecs->ws.value.execd_pathname)); | |
1470 | ||
488f131b JB |
1471 | /* This causes the eventpoints and symbol table to be reset. Must |
1472 | do this now, before trying to determine whether to stop. */ | |
1473 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); | |
1474 | xfree (pending_follow.execd_pathname); | |
c906108c | 1475 | |
488f131b JB |
1476 | stop_pc = read_pc_pid (ecs->ptid); |
1477 | ecs->saved_inferior_ptid = inferior_ptid; | |
1478 | inferior_ptid = ecs->ptid; | |
675bf4cb | 1479 | |
00d4360e | 1480 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1481 | |
488f131b JB |
1482 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1483 | inferior_ptid = ecs->saved_inferior_ptid; | |
04e68871 | 1484 | |
5a2901d9 DJ |
1485 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
1486 | { | |
1487 | context_switch (ecs); | |
35f196d9 | 1488 | reinit_frame_cache (); |
5a2901d9 DJ |
1489 | } |
1490 | ||
04e68871 DJ |
1491 | /* If no catchpoint triggered for this, then keep going. */ |
1492 | if (ecs->random_signal) | |
1493 | { | |
1494 | stop_signal = TARGET_SIGNAL_0; | |
1495 | keep_going (ecs); | |
1496 | return; | |
1497 | } | |
488f131b JB |
1498 | goto process_event_stop_test; |
1499 | ||
b4dc5ffa MK |
1500 | /* Be careful not to try to gather much state about a thread |
1501 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 1502 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 1503 | if (debug_infrun) |
8a9de0e4 | 1504 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); |
488f131b JB |
1505 | resume (0, TARGET_SIGNAL_0); |
1506 | prepare_to_wait (ecs); | |
1507 | return; | |
c906108c | 1508 | |
488f131b JB |
1509 | /* Before examining the threads further, step this thread to |
1510 | get it entirely out of the syscall. (We get notice of the | |
1511 | event when the thread is just on the verge of exiting a | |
1512 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 1513 | into user code.) */ |
488f131b | 1514 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 1515 | if (debug_infrun) |
8a9de0e4 | 1516 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); |
488f131b | 1517 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
488f131b JB |
1518 | prepare_to_wait (ecs); |
1519 | return; | |
c906108c | 1520 | |
488f131b | 1521 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 1522 | if (debug_infrun) |
8a9de0e4 | 1523 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
488f131b JB |
1524 | stop_signal = ecs->ws.value.sig; |
1525 | break; | |
c906108c | 1526 | |
488f131b JB |
1527 | /* We had an event in the inferior, but we are not interested |
1528 | in handling it at this level. The lower layers have already | |
8e7d2c16 | 1529 | done what needs to be done, if anything. |
8fb3e588 AC |
1530 | |
1531 | One of the possible circumstances for this is when the | |
1532 | inferior produces output for the console. The inferior has | |
1533 | not stopped, and we are ignoring the event. Another possible | |
1534 | circumstance is any event which the lower level knows will be | |
1535 | reported multiple times without an intervening resume. */ | |
488f131b | 1536 | case TARGET_WAITKIND_IGNORE: |
527159b7 | 1537 | if (debug_infrun) |
8a9de0e4 | 1538 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); |
8e7d2c16 | 1539 | prepare_to_wait (ecs); |
488f131b JB |
1540 | return; |
1541 | } | |
c906108c | 1542 | |
488f131b JB |
1543 | /* We may want to consider not doing a resume here in order to give |
1544 | the user a chance to play with the new thread. It might be good | |
1545 | to make that a user-settable option. */ | |
c906108c | 1546 | |
488f131b JB |
1547 | /* At this point, all threads are stopped (happens automatically in |
1548 | either the OS or the native code). Therefore we need to continue | |
1549 | all threads in order to make progress. */ | |
1550 | if (ecs->new_thread_event) | |
1551 | { | |
1552 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1553 | prepare_to_wait (ecs); | |
1554 | return; | |
1555 | } | |
c906108c | 1556 | |
488f131b JB |
1557 | stop_pc = read_pc_pid (ecs->ptid); |
1558 | ||
527159b7 | 1559 | if (debug_infrun) |
8a9de0e4 | 1560 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc)); |
527159b7 | 1561 | |
9f976b41 DJ |
1562 | if (stepping_past_singlestep_breakpoint) |
1563 | { | |
8fb3e588 AC |
1564 | gdb_assert (SOFTWARE_SINGLE_STEP_P () |
1565 | && singlestep_breakpoints_inserted_p); | |
9f976b41 DJ |
1566 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
1567 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
1568 | ||
1569 | stepping_past_singlestep_breakpoint = 0; | |
1570 | ||
1571 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
1572 | breakpoint, or stopped for some other reason. It would be nice if |
1573 | we could tell, but we can't reliably. */ | |
9f976b41 | 1574 | if (stop_signal == TARGET_SIGNAL_TRAP) |
8fb3e588 | 1575 | { |
527159b7 | 1576 | if (debug_infrun) |
8a9de0e4 | 1577 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n"); |
9f976b41 DJ |
1578 | /* Pull the single step breakpoints out of the target. */ |
1579 | SOFTWARE_SINGLE_STEP (0, 0); | |
1580 | singlestep_breakpoints_inserted_p = 0; | |
1581 | ||
1582 | ecs->random_signal = 0; | |
1583 | ||
1584 | ecs->ptid = saved_singlestep_ptid; | |
1585 | context_switch (ecs); | |
9a4105ab AC |
1586 | if (deprecated_context_hook) |
1587 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
1588 | |
1589 | resume (1, TARGET_SIGNAL_0); | |
1590 | prepare_to_wait (ecs); | |
1591 | return; | |
1592 | } | |
1593 | } | |
1594 | ||
1595 | stepping_past_singlestep_breakpoint = 0; | |
1596 | ||
488f131b JB |
1597 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1598 | another thread. If so, then step that thread past the breakpoint, | |
1599 | and continue it. */ | |
1600 | ||
1601 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1602 | { | |
9f976b41 DJ |
1603 | int thread_hop_needed = 0; |
1604 | ||
f8d40ec8 JB |
1605 | /* Check if a regular breakpoint has been hit before checking |
1606 | for a potential single step breakpoint. Otherwise, GDB will | |
1607 | not see this breakpoint hit when stepping onto breakpoints. */ | |
4fa8626c | 1608 | if (breakpoints_inserted && breakpoint_here_p (stop_pc)) |
488f131b | 1609 | { |
c5aa993b | 1610 | ecs->random_signal = 0; |
4fa8626c | 1611 | if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
9f976b41 DJ |
1612 | thread_hop_needed = 1; |
1613 | } | |
1614 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
1615 | { | |
fd48f117 DJ |
1616 | /* We have not context switched yet, so this should be true |
1617 | no matter which thread hit the singlestep breakpoint. */ | |
1618 | gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid)); | |
1619 | if (debug_infrun) | |
1620 | fprintf_unfiltered (gdb_stdlog, "infrun: software single step " | |
1621 | "trap for %s\n", | |
1622 | target_pid_to_str (ecs->ptid)); | |
1623 | ||
9f976b41 DJ |
1624 | ecs->random_signal = 0; |
1625 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
1626 | change when we go from single-threaded to multi-threaded. If | |
1627 | the singlestep_ptid is still in the list, assume that it is | |
1628 | really different from ecs->ptid. */ | |
1629 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
1630 | && in_thread_list (singlestep_ptid)) | |
1631 | { | |
fd48f117 DJ |
1632 | /* If the PC of the thread we were trying to single-step |
1633 | has changed, discard this event (which we were going | |
1634 | to ignore anyway), and pretend we saw that thread | |
1635 | trap. This prevents us continuously moving the | |
1636 | single-step breakpoint forward, one instruction at a | |
1637 | time. If the PC has changed, then the thread we were | |
1638 | trying to single-step has trapped or been signalled, | |
1639 | but the event has not been reported to GDB yet. | |
1640 | ||
1641 | There might be some cases where this loses signal | |
1642 | information, if a signal has arrived at exactly the | |
1643 | same time that the PC changed, but this is the best | |
1644 | we can do with the information available. Perhaps we | |
1645 | should arrange to report all events for all threads | |
1646 | when they stop, or to re-poll the remote looking for | |
1647 | this particular thread (i.e. temporarily enable | |
1648 | schedlock). */ | |
1649 | if (read_pc_pid (singlestep_ptid) != singlestep_pc) | |
1650 | { | |
1651 | if (debug_infrun) | |
1652 | fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread," | |
1653 | " but expected thread advanced also\n"); | |
1654 | ||
1655 | /* The current context still belongs to | |
1656 | singlestep_ptid. Don't swap here, since that's | |
1657 | the context we want to use. Just fudge our | |
1658 | state and continue. */ | |
1659 | ecs->ptid = singlestep_ptid; | |
1660 | stop_pc = read_pc_pid (ecs->ptid); | |
1661 | } | |
1662 | else | |
1663 | { | |
1664 | if (debug_infrun) | |
1665 | fprintf_unfiltered (gdb_stdlog, | |
1666 | "infrun: unexpected thread\n"); | |
1667 | ||
1668 | thread_hop_needed = 1; | |
1669 | stepping_past_singlestep_breakpoint = 1; | |
1670 | saved_singlestep_ptid = singlestep_ptid; | |
1671 | } | |
9f976b41 DJ |
1672 | } |
1673 | } | |
1674 | ||
1675 | if (thread_hop_needed) | |
8fb3e588 AC |
1676 | { |
1677 | int remove_status; | |
1678 | ||
527159b7 | 1679 | if (debug_infrun) |
8a9de0e4 | 1680 | fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); |
527159b7 | 1681 | |
8fb3e588 AC |
1682 | /* Saw a breakpoint, but it was hit by the wrong thread. |
1683 | Just continue. */ | |
1684 | ||
1685 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
488f131b | 1686 | { |
8fb3e588 AC |
1687 | /* Pull the single step breakpoints out of the target. */ |
1688 | SOFTWARE_SINGLE_STEP (0, 0); | |
1689 | singlestep_breakpoints_inserted_p = 0; | |
1690 | } | |
1691 | ||
1692 | remove_status = remove_breakpoints (); | |
1693 | /* Did we fail to remove breakpoints? If so, try | |
1694 | to set the PC past the bp. (There's at least | |
1695 | one situation in which we can fail to remove | |
1696 | the bp's: On HP-UX's that use ttrace, we can't | |
1697 | change the address space of a vforking child | |
1698 | process until the child exits (well, okay, not | |
1699 | then either :-) or execs. */ | |
1700 | if (remove_status != 0) | |
1701 | { | |
1702 | /* FIXME! This is obviously non-portable! */ | |
1703 | write_pc_pid (stop_pc + 4, ecs->ptid); | |
1704 | /* We need to restart all the threads now, | |
1705 | * unles we're running in scheduler-locked mode. | |
1706 | * Use currently_stepping to determine whether to | |
1707 | * step or continue. | |
1708 | */ | |
1709 | /* FIXME MVS: is there any reason not to call resume()? */ | |
1710 | if (scheduler_mode == schedlock_on) | |
1711 | target_resume (ecs->ptid, | |
1712 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
488f131b | 1713 | else |
8fb3e588 AC |
1714 | target_resume (RESUME_ALL, |
1715 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1716 | prepare_to_wait (ecs); | |
1717 | return; | |
1718 | } | |
1719 | else | |
1720 | { /* Single step */ | |
1721 | breakpoints_inserted = 0; | |
1722 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
1723 | context_switch (ecs); | |
1724 | ecs->waiton_ptid = ecs->ptid; | |
1725 | ecs->wp = &(ecs->ws); | |
1726 | ecs->another_trap = 1; | |
1727 | ||
1728 | ecs->infwait_state = infwait_thread_hop_state; | |
1729 | keep_going (ecs); | |
1730 | registers_changed (); | |
1731 | return; | |
1732 | } | |
488f131b | 1733 | } |
f8d40ec8 | 1734 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
8fb3e588 AC |
1735 | { |
1736 | sw_single_step_trap_p = 1; | |
1737 | ecs->random_signal = 0; | |
1738 | } | |
488f131b JB |
1739 | } |
1740 | else | |
1741 | ecs->random_signal = 1; | |
c906108c | 1742 | |
488f131b | 1743 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
1744 | so, then switch to that thread. */ |
1745 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 1746 | { |
527159b7 | 1747 | if (debug_infrun) |
8a9de0e4 | 1748 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 1749 | |
488f131b | 1750 | context_switch (ecs); |
c5aa993b | 1751 | |
9a4105ab AC |
1752 | if (deprecated_context_hook) |
1753 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 1754 | } |
c906108c | 1755 | |
488f131b JB |
1756 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1757 | { | |
1758 | /* Pull the single step breakpoints out of the target. */ | |
1759 | SOFTWARE_SINGLE_STEP (0, 0); | |
1760 | singlestep_breakpoints_inserted_p = 0; | |
1761 | } | |
c906108c | 1762 | |
488f131b JB |
1763 | /* It may not be necessary to disable the watchpoint to stop over |
1764 | it. For example, the PA can (with some kernel cooperation) | |
1765 | single step over a watchpoint without disabling the watchpoint. */ | |
1766 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1767 | { | |
527159b7 | 1768 | if (debug_infrun) |
8a9de0e4 | 1769 | fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n"); |
488f131b JB |
1770 | resume (1, 0); |
1771 | prepare_to_wait (ecs); | |
1772 | return; | |
1773 | } | |
c906108c | 1774 | |
488f131b JB |
1775 | /* It is far more common to need to disable a watchpoint to step |
1776 | the inferior over it. FIXME. What else might a debug | |
1777 | register or page protection watchpoint scheme need here? */ | |
1778 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1779 | { | |
1780 | /* At this point, we are stopped at an instruction which has | |
1781 | attempted to write to a piece of memory under control of | |
1782 | a watchpoint. The instruction hasn't actually executed | |
1783 | yet. If we were to evaluate the watchpoint expression | |
1784 | now, we would get the old value, and therefore no change | |
1785 | would seem to have occurred. | |
1786 | ||
1787 | In order to make watchpoints work `right', we really need | |
1788 | to complete the memory write, and then evaluate the | |
1789 | watchpoint expression. The following code does that by | |
1790 | removing the watchpoint (actually, all watchpoints and | |
1791 | breakpoints), single-stepping the target, re-inserting | |
1792 | watchpoints, and then falling through to let normal | |
1793 | single-step processing handle proceed. Since this | |
1794 | includes evaluating watchpoints, things will come to a | |
1795 | stop in the correct manner. */ | |
1796 | ||
527159b7 | 1797 | if (debug_infrun) |
8a9de0e4 | 1798 | fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n"); |
488f131b JB |
1799 | remove_breakpoints (); |
1800 | registers_changed (); | |
1801 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
c5aa993b | 1802 | |
488f131b JB |
1803 | ecs->waiton_ptid = ecs->ptid; |
1804 | ecs->wp = &(ecs->ws); | |
1805 | ecs->infwait_state = infwait_nonstep_watch_state; | |
1806 | prepare_to_wait (ecs); | |
1807 | return; | |
1808 | } | |
1809 | ||
1810 | /* It may be possible to simply continue after a watchpoint. */ | |
1811 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
00d4360e | 1812 | stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws); |
488f131b JB |
1813 | |
1814 | ecs->stop_func_start = 0; | |
1815 | ecs->stop_func_end = 0; | |
1816 | ecs->stop_func_name = 0; | |
1817 | /* Don't care about return value; stop_func_start and stop_func_name | |
1818 | will both be 0 if it doesn't work. */ | |
1819 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
1820 | &ecs->stop_func_start, &ecs->stop_func_end); | |
782263ab | 1821 | ecs->stop_func_start += DEPRECATED_FUNCTION_START_OFFSET; |
488f131b JB |
1822 | ecs->another_trap = 0; |
1823 | bpstat_clear (&stop_bpstat); | |
1824 | stop_step = 0; | |
1825 | stop_stack_dummy = 0; | |
1826 | stop_print_frame = 1; | |
1827 | ecs->random_signal = 0; | |
1828 | stopped_by_random_signal = 0; | |
488f131b | 1829 | |
3352ef37 AC |
1830 | if (stop_signal == TARGET_SIGNAL_TRAP |
1831 | && trap_expected | |
1832 | && gdbarch_single_step_through_delay_p (current_gdbarch) | |
1833 | && currently_stepping (ecs)) | |
1834 | { | |
1835 | /* We're trying to step of a breakpoint. Turns out that we're | |
1836 | also on an instruction that needs to be stepped multiple | |
1837 | times before it's been fully executing. E.g., architectures | |
1838 | with a delay slot. It needs to be stepped twice, once for | |
1839 | the instruction and once for the delay slot. */ | |
1840 | int step_through_delay | |
1841 | = gdbarch_single_step_through_delay (current_gdbarch, | |
1842 | get_current_frame ()); | |
527159b7 | 1843 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 1844 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
3352ef37 AC |
1845 | if (step_range_end == 0 && step_through_delay) |
1846 | { | |
1847 | /* The user issued a continue when stopped at a breakpoint. | |
1848 | Set up for another trap and get out of here. */ | |
1849 | ecs->another_trap = 1; | |
1850 | keep_going (ecs); | |
1851 | return; | |
1852 | } | |
1853 | else if (step_through_delay) | |
1854 | { | |
1855 | /* The user issued a step when stopped at a breakpoint. | |
1856 | Maybe we should stop, maybe we should not - the delay | |
1857 | slot *might* correspond to a line of source. In any | |
1858 | case, don't decide that here, just set ecs->another_trap, | |
1859 | making sure we single-step again before breakpoints are | |
1860 | re-inserted. */ | |
1861 | ecs->another_trap = 1; | |
1862 | } | |
1863 | } | |
1864 | ||
488f131b JB |
1865 | /* Look at the cause of the stop, and decide what to do. |
1866 | The alternatives are: | |
1867 | 1) break; to really stop and return to the debugger, | |
1868 | 2) drop through to start up again | |
1869 | (set ecs->another_trap to 1 to single step once) | |
1870 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
1871 | will be made according to the signal handling tables. */ | |
1872 | ||
1873 | /* First, distinguish signals caused by the debugger from signals | |
03cebad2 MK |
1874 | that have to do with the program's own actions. Note that |
1875 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
1876 | on the operating system version. Here we detect when a SIGILL or | |
1877 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
1878 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
1879 | when we're trying to execute a breakpoint instruction on a | |
1880 | non-executable stack. This happens for call dummy breakpoints | |
1881 | for architectures like SPARC that place call dummies on the | |
1882 | stack. */ | |
488f131b JB |
1883 | |
1884 | if (stop_signal == TARGET_SIGNAL_TRAP | |
8fb3e588 AC |
1885 | || (breakpoints_inserted |
1886 | && (stop_signal == TARGET_SIGNAL_ILL | |
1887 | || stop_signal == TARGET_SIGNAL_SEGV | |
1888 | || stop_signal == TARGET_SIGNAL_EMT)) | |
1889 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP) | |
488f131b JB |
1890 | { |
1891 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1892 | { | |
527159b7 | 1893 | if (debug_infrun) |
8a9de0e4 | 1894 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); |
488f131b JB |
1895 | stop_print_frame = 0; |
1896 | stop_stepping (ecs); | |
1897 | return; | |
1898 | } | |
c54cfec8 EZ |
1899 | |
1900 | /* This is originated from start_remote(), start_inferior() and | |
1901 | shared libraries hook functions. */ | |
c0236d92 | 1902 | if (stop_soon == STOP_QUIETLY) |
488f131b | 1903 | { |
527159b7 | 1904 | if (debug_infrun) |
8a9de0e4 | 1905 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); |
488f131b JB |
1906 | stop_stepping (ecs); |
1907 | return; | |
1908 | } | |
1909 | ||
c54cfec8 EZ |
1910 | /* This originates from attach_command(). We need to overwrite |
1911 | the stop_signal here, because some kernels don't ignore a | |
1912 | SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call. | |
1913 | See more comments in inferior.h. */ | |
c0236d92 | 1914 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
c54cfec8 EZ |
1915 | { |
1916 | stop_stepping (ecs); | |
1917 | if (stop_signal == TARGET_SIGNAL_STOP) | |
1918 | stop_signal = TARGET_SIGNAL_0; | |
1919 | return; | |
1920 | } | |
1921 | ||
d303a6c7 AC |
1922 | /* Don't even think about breakpoints if just proceeded over a |
1923 | breakpoint. */ | |
1924 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected) | |
527159b7 RC |
1925 | { |
1926 | if (debug_infrun) | |
8a9de0e4 | 1927 | fprintf_unfiltered (gdb_stdlog, "infrun: trap expected\n"); |
527159b7 RC |
1928 | bpstat_clear (&stop_bpstat); |
1929 | } | |
488f131b JB |
1930 | else |
1931 | { | |
1932 | /* See if there is a breakpoint at the current PC. */ | |
8fb3e588 | 1933 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, |
00d4360e | 1934 | stopped_by_watchpoint); |
488f131b | 1935 | |
488f131b JB |
1936 | /* Following in case break condition called a |
1937 | function. */ | |
1938 | stop_print_frame = 1; | |
1939 | } | |
1940 | ||
73dd234f | 1941 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
1942 | at one stage in the past included checks for an inferior |
1943 | function call's call dummy's return breakpoint. The original | |
1944 | comment, that went with the test, read: | |
73dd234f | 1945 | |
8fb3e588 AC |
1946 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
1947 | another signal besides SIGTRAP, so check here as well as | |
1948 | above.'' | |
73dd234f AC |
1949 | |
1950 | If someone ever tries to get get call dummys on a | |
1951 | non-executable stack to work (where the target would stop | |
03cebad2 MK |
1952 | with something like a SIGSEGV), then those tests might need |
1953 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 1954 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
1955 | suspect that it won't be the case. |
1956 | ||
8fb3e588 AC |
1957 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
1958 | be necessary for call dummies on a non-executable stack on | |
1959 | SPARC. */ | |
73dd234f | 1960 | |
488f131b JB |
1961 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1962 | ecs->random_signal | |
1963 | = !(bpstat_explains_signal (stop_bpstat) | |
1964 | || trap_expected | |
488f131b | 1965 | || (step_range_end && step_resume_breakpoint == NULL)); |
488f131b JB |
1966 | else |
1967 | { | |
73dd234f | 1968 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
488f131b JB |
1969 | if (!ecs->random_signal) |
1970 | stop_signal = TARGET_SIGNAL_TRAP; | |
1971 | } | |
1972 | } | |
1973 | ||
1974 | /* When we reach this point, we've pretty much decided | |
1975 | that the reason for stopping must've been a random | |
1976 | (unexpected) signal. */ | |
1977 | ||
1978 | else | |
1979 | ecs->random_signal = 1; | |
488f131b | 1980 | |
04e68871 | 1981 | process_event_stop_test: |
488f131b JB |
1982 | /* For the program's own signals, act according to |
1983 | the signal handling tables. */ | |
1984 | ||
1985 | if (ecs->random_signal) | |
1986 | { | |
1987 | /* Signal not for debugging purposes. */ | |
1988 | int printed = 0; | |
1989 | ||
527159b7 | 1990 | if (debug_infrun) |
8a9de0e4 | 1991 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", stop_signal); |
527159b7 | 1992 | |
488f131b JB |
1993 | stopped_by_random_signal = 1; |
1994 | ||
1995 | if (signal_print[stop_signal]) | |
1996 | { | |
1997 | printed = 1; | |
1998 | target_terminal_ours_for_output (); | |
1999 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
2000 | } | |
2001 | if (signal_stop[stop_signal]) | |
2002 | { | |
2003 | stop_stepping (ecs); | |
2004 | return; | |
2005 | } | |
2006 | /* If not going to stop, give terminal back | |
2007 | if we took it away. */ | |
2008 | else if (printed) | |
2009 | target_terminal_inferior (); | |
2010 | ||
2011 | /* Clear the signal if it should not be passed. */ | |
2012 | if (signal_program[stop_signal] == 0) | |
2013 | stop_signal = TARGET_SIGNAL_0; | |
2014 | ||
68f53502 AC |
2015 | if (prev_pc == read_pc () |
2016 | && !breakpoints_inserted | |
2017 | && breakpoint_here_p (read_pc ()) | |
2018 | && step_resume_breakpoint == NULL) | |
2019 | { | |
2020 | /* We were just starting a new sequence, attempting to | |
2021 | single-step off of a breakpoint and expecting a SIGTRAP. | |
2022 | Intead this signal arrives. This signal will take us out | |
2023 | of the stepping range so GDB needs to remember to, when | |
2024 | the signal handler returns, resume stepping off that | |
2025 | breakpoint. */ | |
2026 | /* To simplify things, "continue" is forced to use the same | |
2027 | code paths as single-step - set a breakpoint at the | |
2028 | signal return address and then, once hit, step off that | |
2029 | breakpoint. */ | |
44cbf7b5 | 2030 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
68f53502 | 2031 | ecs->step_after_step_resume_breakpoint = 1; |
9d799f85 AC |
2032 | keep_going (ecs); |
2033 | return; | |
68f53502 | 2034 | } |
9d799f85 AC |
2035 | |
2036 | if (step_range_end != 0 | |
2037 | && stop_signal != TARGET_SIGNAL_0 | |
2038 | && stop_pc >= step_range_start && stop_pc < step_range_end | |
2039 | && frame_id_eq (get_frame_id (get_current_frame ()), | |
2040 | step_frame_id) | |
2041 | && step_resume_breakpoint == NULL) | |
d303a6c7 AC |
2042 | { |
2043 | /* The inferior is about to take a signal that will take it | |
2044 | out of the single step range. Set a breakpoint at the | |
2045 | current PC (which is presumably where the signal handler | |
2046 | will eventually return) and then allow the inferior to | |
2047 | run free. | |
2048 | ||
2049 | Note that this is only needed for a signal delivered | |
2050 | while in the single-step range. Nested signals aren't a | |
2051 | problem as they eventually all return. */ | |
44cbf7b5 | 2052 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
9d799f85 AC |
2053 | keep_going (ecs); |
2054 | return; | |
d303a6c7 | 2055 | } |
9d799f85 AC |
2056 | |
2057 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
2058 | when either there's a nested signal, or when there's a | |
2059 | pending signal enabled just as the signal handler returns | |
2060 | (leaving the inferior at the step-resume-breakpoint without | |
2061 | actually executing it). Either way continue until the | |
2062 | breakpoint is really hit. */ | |
488f131b JB |
2063 | keep_going (ecs); |
2064 | return; | |
2065 | } | |
2066 | ||
2067 | /* Handle cases caused by hitting a breakpoint. */ | |
2068 | { | |
2069 | CORE_ADDR jmp_buf_pc; | |
2070 | struct bpstat_what what; | |
2071 | ||
2072 | what = bpstat_what (stop_bpstat); | |
2073 | ||
2074 | if (what.call_dummy) | |
2075 | { | |
2076 | stop_stack_dummy = 1; | |
c5aa993b | 2077 | } |
c906108c | 2078 | |
488f131b | 2079 | switch (what.main_action) |
c5aa993b | 2080 | { |
488f131b JB |
2081 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2082 | /* If we hit the breakpoint at longjmp, disable it for the | |
2083 | duration of this command. Then, install a temporary | |
2084 | breakpoint at the target of the jmp_buf. */ | |
527159b7 | 2085 | if (debug_infrun) |
8802d8ed | 2086 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); |
488f131b JB |
2087 | disable_longjmp_breakpoint (); |
2088 | remove_breakpoints (); | |
2089 | breakpoints_inserted = 0; | |
2090 | if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
c5aa993b | 2091 | { |
488f131b | 2092 | keep_going (ecs); |
104c1213 | 2093 | return; |
c5aa993b | 2094 | } |
488f131b JB |
2095 | |
2096 | /* Need to blow away step-resume breakpoint, as it | |
2097 | interferes with us */ | |
2098 | if (step_resume_breakpoint != NULL) | |
104c1213 | 2099 | { |
488f131b | 2100 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
104c1213 | 2101 | } |
c906108c | 2102 | |
8fb3e588 | 2103 | set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
488f131b JB |
2104 | ecs->handling_longjmp = 1; /* FIXME */ |
2105 | keep_going (ecs); | |
2106 | return; | |
c906108c | 2107 | |
488f131b JB |
2108 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2109 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
527159b7 | 2110 | if (debug_infrun) |
8802d8ed | 2111 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); |
488f131b JB |
2112 | remove_breakpoints (); |
2113 | breakpoints_inserted = 0; | |
488f131b JB |
2114 | disable_longjmp_breakpoint (); |
2115 | ecs->handling_longjmp = 0; /* FIXME */ | |
2116 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2117 | break; | |
2118 | /* else fallthrough */ | |
2119 | ||
2120 | case BPSTAT_WHAT_SINGLE: | |
527159b7 | 2121 | if (debug_infrun) |
8802d8ed | 2122 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); |
488f131b | 2123 | if (breakpoints_inserted) |
569631c6 | 2124 | remove_breakpoints (); |
488f131b JB |
2125 | breakpoints_inserted = 0; |
2126 | ecs->another_trap = 1; | |
2127 | /* Still need to check other stuff, at least the case | |
2128 | where we are stepping and step out of the right range. */ | |
2129 | break; | |
c906108c | 2130 | |
488f131b | 2131 | case BPSTAT_WHAT_STOP_NOISY: |
527159b7 | 2132 | if (debug_infrun) |
8802d8ed | 2133 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); |
488f131b | 2134 | stop_print_frame = 1; |
c906108c | 2135 | |
d303a6c7 AC |
2136 | /* We are about to nuke the step_resume_breakpointt via the |
2137 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2138 | |
488f131b JB |
2139 | stop_stepping (ecs); |
2140 | return; | |
c5aa993b | 2141 | |
488f131b | 2142 | case BPSTAT_WHAT_STOP_SILENT: |
527159b7 | 2143 | if (debug_infrun) |
8802d8ed | 2144 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); |
488f131b | 2145 | stop_print_frame = 0; |
c5aa993b | 2146 | |
d303a6c7 AC |
2147 | /* We are about to nuke the step_resume_breakpoin via the |
2148 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2149 | |
488f131b | 2150 | stop_stepping (ecs); |
e441088d | 2151 | return; |
c5aa993b | 2152 | |
488f131b JB |
2153 | case BPSTAT_WHAT_STEP_RESUME: |
2154 | /* This proably demands a more elegant solution, but, yeah | |
2155 | right... | |
c5aa993b | 2156 | |
488f131b JB |
2157 | This function's use of the simple variable |
2158 | step_resume_breakpoint doesn't seem to accomodate | |
2159 | simultaneously active step-resume bp's, although the | |
2160 | breakpoint list certainly can. | |
c5aa993b | 2161 | |
488f131b JB |
2162 | If we reach here and step_resume_breakpoint is already |
2163 | NULL, then apparently we have multiple active | |
2164 | step-resume bp's. We'll just delete the breakpoint we | |
2165 | stopped at, and carry on. | |
2166 | ||
2167 | Correction: what the code currently does is delete a | |
2168 | step-resume bp, but it makes no effort to ensure that | |
2169 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2170 | |
527159b7 | 2171 | if (debug_infrun) |
8802d8ed | 2172 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); |
527159b7 | 2173 | |
488f131b JB |
2174 | if (step_resume_breakpoint == NULL) |
2175 | { | |
2176 | step_resume_breakpoint = | |
2177 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2178 | } | |
2179 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
68f53502 AC |
2180 | if (ecs->step_after_step_resume_breakpoint) |
2181 | { | |
2182 | /* Back when the step-resume breakpoint was inserted, we | |
2183 | were trying to single-step off a breakpoint. Go back | |
2184 | to doing that. */ | |
2185 | ecs->step_after_step_resume_breakpoint = 0; | |
2186 | remove_breakpoints (); | |
2187 | breakpoints_inserted = 0; | |
2188 | ecs->another_trap = 1; | |
2189 | keep_going (ecs); | |
2190 | return; | |
2191 | } | |
488f131b JB |
2192 | break; |
2193 | ||
2194 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
527159b7 | 2195 | if (debug_infrun) |
8802d8ed | 2196 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_THROUGH_SIGTRAMP\n"); |
488f131b JB |
2197 | /* If were waiting for a trap, hitting the step_resume_break |
2198 | doesn't count as getting it. */ | |
2199 | if (trap_expected) | |
2200 | ecs->another_trap = 1; | |
2201 | break; | |
2202 | ||
2203 | case BPSTAT_WHAT_CHECK_SHLIBS: | |
2204 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
c906108c | 2205 | { |
527159b7 | 2206 | if (debug_infrun) |
8802d8ed | 2207 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n"); |
488f131b JB |
2208 | /* Remove breakpoints, we eventually want to step over the |
2209 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2210 | breakpoint addresses via breakpoint_re_set. */ | |
2211 | if (breakpoints_inserted) | |
2212 | remove_breakpoints (); | |
c5aa993b | 2213 | breakpoints_inserted = 0; |
488f131b JB |
2214 | |
2215 | /* Check for any newly added shared libraries if we're | |
2216 | supposed to be adding them automatically. Switch | |
2217 | terminal for any messages produced by | |
2218 | breakpoint_re_set. */ | |
2219 | target_terminal_ours_for_output (); | |
aff6338a | 2220 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
2221 | stack's section table is kept up-to-date. Architectures, |
2222 | (e.g., PPC64), use the section table to perform | |
2223 | operations such as address => section name and hence | |
2224 | require the table to contain all sections (including | |
2225 | those found in shared libraries). */ | |
aff6338a | 2226 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
2227 | exec_ops to SOLIB_ADD. This is because current GDB is |
2228 | only tooled to propagate section_table changes out from | |
2229 | the "current_target" (see target_resize_to_sections), and | |
2230 | not up from the exec stratum. This, of course, isn't | |
2231 | right. "infrun.c" should only interact with the | |
2232 | exec/process stratum, instead relying on the target stack | |
2233 | to propagate relevant changes (stop, section table | |
2234 | changed, ...) up to other layers. */ | |
a77053c2 | 2235 | #ifdef SOLIB_ADD |
aff6338a | 2236 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
a77053c2 MK |
2237 | #else |
2238 | solib_add (NULL, 0, ¤t_target, auto_solib_add); | |
2239 | #endif | |
488f131b JB |
2240 | target_terminal_inferior (); |
2241 | ||
2242 | /* Try to reenable shared library breakpoints, additional | |
2243 | code segments in shared libraries might be mapped in now. */ | |
2244 | re_enable_breakpoints_in_shlibs (); | |
2245 | ||
2246 | /* If requested, stop when the dynamic linker notifies | |
2247 | gdb of events. This allows the user to get control | |
2248 | and place breakpoints in initializer routines for | |
2249 | dynamically loaded objects (among other things). */ | |
877522db | 2250 | if (stop_on_solib_events || stop_stack_dummy) |
d4f3574e | 2251 | { |
488f131b | 2252 | stop_stepping (ecs); |
d4f3574e SS |
2253 | return; |
2254 | } | |
c5aa993b | 2255 | |
488f131b JB |
2256 | /* If we stopped due to an explicit catchpoint, then the |
2257 | (see above) call to SOLIB_ADD pulled in any symbols | |
2258 | from a newly-loaded library, if appropriate. | |
2259 | ||
2260 | We do want the inferior to stop, but not where it is | |
2261 | now, which is in the dynamic linker callback. Rather, | |
2262 | we would like it stop in the user's program, just after | |
2263 | the call that caused this catchpoint to trigger. That | |
2264 | gives the user a more useful vantage from which to | |
2265 | examine their program's state. */ | |
8fb3e588 AC |
2266 | else if (what.main_action |
2267 | == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
c906108c | 2268 | { |
488f131b JB |
2269 | /* ??rehrauer: If I could figure out how to get the |
2270 | right return PC from here, we could just set a temp | |
2271 | breakpoint and resume. I'm not sure we can without | |
2272 | cracking open the dld's shared libraries and sniffing | |
2273 | their unwind tables and text/data ranges, and that's | |
2274 | not a terribly portable notion. | |
2275 | ||
2276 | Until that time, we must step the inferior out of the | |
2277 | dld callback, and also out of the dld itself (and any | |
2278 | code or stubs in libdld.sl, such as "shl_load" and | |
2279 | friends) until we reach non-dld code. At that point, | |
2280 | we can stop stepping. */ | |
2281 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2282 | &ecs-> | |
2283 | stepping_through_solib_catchpoints); | |
2284 | ecs->stepping_through_solib_after_catch = 1; | |
2285 | ||
2286 | /* Be sure to lift all breakpoints, so the inferior does | |
2287 | actually step past this point... */ | |
2288 | ecs->another_trap = 1; | |
2289 | break; | |
c906108c | 2290 | } |
c5aa993b | 2291 | else |
c5aa993b | 2292 | { |
488f131b | 2293 | /* We want to step over this breakpoint, then keep going. */ |
c5aa993b | 2294 | ecs->another_trap = 1; |
488f131b | 2295 | break; |
c5aa993b | 2296 | } |
488f131b | 2297 | } |
488f131b | 2298 | break; |
c906108c | 2299 | |
488f131b JB |
2300 | case BPSTAT_WHAT_LAST: |
2301 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2302 | |
488f131b JB |
2303 | case BPSTAT_WHAT_KEEP_CHECKING: |
2304 | break; | |
2305 | } | |
2306 | } | |
c906108c | 2307 | |
488f131b JB |
2308 | /* We come here if we hit a breakpoint but should not |
2309 | stop for it. Possibly we also were stepping | |
2310 | and should stop for that. So fall through and | |
2311 | test for stepping. But, if not stepping, | |
2312 | do not stop. */ | |
c906108c | 2313 | |
9d1ff73f MS |
2314 | /* Are we stepping to get the inferior out of the dynamic linker's |
2315 | hook (and possibly the dld itself) after catching a shlib | |
2316 | event? */ | |
488f131b JB |
2317 | if (ecs->stepping_through_solib_after_catch) |
2318 | { | |
2319 | #if defined(SOLIB_ADD) | |
2320 | /* Have we reached our destination? If not, keep going. */ | |
2321 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2322 | { | |
527159b7 | 2323 | if (debug_infrun) |
8a9de0e4 | 2324 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n"); |
488f131b JB |
2325 | ecs->another_trap = 1; |
2326 | keep_going (ecs); | |
104c1213 | 2327 | return; |
488f131b JB |
2328 | } |
2329 | #endif | |
527159b7 | 2330 | if (debug_infrun) |
8a9de0e4 | 2331 | fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n"); |
488f131b JB |
2332 | /* Else, stop and report the catchpoint(s) whose triggering |
2333 | caused us to begin stepping. */ | |
2334 | ecs->stepping_through_solib_after_catch = 0; | |
2335 | bpstat_clear (&stop_bpstat); | |
2336 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2337 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2338 | stop_print_frame = 1; | |
2339 | stop_stepping (ecs); | |
2340 | return; | |
2341 | } | |
c906108c | 2342 | |
488f131b JB |
2343 | if (step_resume_breakpoint) |
2344 | { | |
527159b7 | 2345 | if (debug_infrun) |
8a9de0e4 | 2346 | fprintf_unfiltered (gdb_stdlog, "infrun: step-resume breakpoint\n"); |
527159b7 | 2347 | |
488f131b JB |
2348 | /* Having a step-resume breakpoint overrides anything |
2349 | else having to do with stepping commands until | |
2350 | that breakpoint is reached. */ | |
488f131b JB |
2351 | keep_going (ecs); |
2352 | return; | |
2353 | } | |
c5aa993b | 2354 | |
488f131b JB |
2355 | if (step_range_end == 0) |
2356 | { | |
527159b7 | 2357 | if (debug_infrun) |
8a9de0e4 | 2358 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 2359 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
2360 | keep_going (ecs); |
2361 | return; | |
2362 | } | |
c5aa993b | 2363 | |
488f131b | 2364 | /* If stepping through a line, keep going if still within it. |
c906108c | 2365 | |
488f131b JB |
2366 | Note that step_range_end is the address of the first instruction |
2367 | beyond the step range, and NOT the address of the last instruction | |
2368 | within it! */ | |
2369 | if (stop_pc >= step_range_start && stop_pc < step_range_end) | |
2370 | { | |
527159b7 | 2371 | if (debug_infrun) |
8a9de0e4 | 2372 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping inside range [0x%s-0x%s]\n", |
527159b7 RC |
2373 | paddr_nz (step_range_start), |
2374 | paddr_nz (step_range_end)); | |
488f131b JB |
2375 | keep_going (ecs); |
2376 | return; | |
2377 | } | |
c5aa993b | 2378 | |
488f131b | 2379 | /* We stepped out of the stepping range. */ |
c906108c | 2380 | |
488f131b JB |
2381 | /* If we are stepping at the source level and entered the runtime |
2382 | loader dynamic symbol resolution code, we keep on single stepping | |
2383 | until we exit the run time loader code and reach the callee's | |
2384 | address. */ | |
2385 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
a77053c2 MK |
2386 | #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE |
2387 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc) | |
2388 | #else | |
2389 | && in_solib_dynsym_resolve_code (stop_pc) | |
2390 | #endif | |
2391 | ) | |
488f131b | 2392 | { |
4c8c40e6 MK |
2393 | CORE_ADDR pc_after_resolver = |
2394 | gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); | |
c906108c | 2395 | |
527159b7 | 2396 | if (debug_infrun) |
8a9de0e4 | 2397 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n"); |
527159b7 | 2398 | |
488f131b JB |
2399 | if (pc_after_resolver) |
2400 | { | |
2401 | /* Set up a step-resume breakpoint at the address | |
2402 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2403 | struct symtab_and_line sr_sal; | |
fe39c653 | 2404 | init_sal (&sr_sal); |
488f131b JB |
2405 | sr_sal.pc = pc_after_resolver; |
2406 | ||
44cbf7b5 | 2407 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c5aa993b | 2408 | } |
c906108c | 2409 | |
488f131b JB |
2410 | keep_going (ecs); |
2411 | return; | |
2412 | } | |
c906108c | 2413 | |
42edda50 AC |
2414 | if (step_range_end != 1 |
2415 | && (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2416 | || step_over_calls == STEP_OVER_ALL) | |
2417 | && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME) | |
488f131b | 2418 | { |
527159b7 | 2419 | if (debug_infrun) |
8a9de0e4 | 2420 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n"); |
42edda50 | 2421 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
2422 | a signal trampoline (either by a signal being delivered or by |
2423 | the signal handler returning). Just single-step until the | |
2424 | inferior leaves the trampoline (either by calling the handler | |
2425 | or returning). */ | |
488f131b JB |
2426 | keep_going (ecs); |
2427 | return; | |
2428 | } | |
c906108c | 2429 | |
c17eaafe DJ |
2430 | /* Check for subroutine calls. The check for the current frame |
2431 | equalling the step ID is not necessary - the check of the | |
2432 | previous frame's ID is sufficient - but it is a common case and | |
2433 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
2434 | |
2435 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
2436 | being equal, so to get into this block, both the current and | |
2437 | previous frame must have valid frame IDs. */ | |
c17eaafe DJ |
2438 | if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id) |
2439 | && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id)) | |
488f131b | 2440 | { |
95918acb | 2441 | CORE_ADDR real_stop_pc; |
8fb3e588 | 2442 | |
527159b7 | 2443 | if (debug_infrun) |
8a9de0e4 | 2444 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 2445 | |
95918acb AC |
2446 | if ((step_over_calls == STEP_OVER_NONE) |
2447 | || ((step_range_end == 1) | |
2448 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
2449 | { | |
2450 | /* I presume that step_over_calls is only 0 when we're | |
2451 | supposed to be stepping at the assembly language level | |
2452 | ("stepi"). Just stop. */ | |
2453 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
2454 | thought it was a subroutine call but it was not. Stop as | |
2455 | well. FENN */ | |
2456 | stop_step = 1; | |
2457 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2458 | stop_stepping (ecs); | |
2459 | return; | |
2460 | } | |
8fb3e588 | 2461 | |
8567c30f AC |
2462 | if (step_over_calls == STEP_OVER_ALL) |
2463 | { | |
2464 | /* We're doing a "next", set a breakpoint at callee's return | |
2465 | address (the address at which the caller will | |
2466 | resume). */ | |
14e60db5 | 2467 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
8567c30f AC |
2468 | keep_going (ecs); |
2469 | return; | |
2470 | } | |
a53c66de | 2471 | |
95918acb | 2472 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
2473 | calling routine and the real function), locate the real |
2474 | function. That's what tells us (a) whether we want to step | |
2475 | into it at all, and (b) what prologue we want to run to the | |
2476 | end of, if we do step into it. */ | |
95918acb AC |
2477 | real_stop_pc = skip_language_trampoline (stop_pc); |
2478 | if (real_stop_pc == 0) | |
2479 | real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2480 | if (real_stop_pc != 0) | |
2481 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 2482 | |
a77053c2 MK |
2483 | if ( |
2484 | #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
2485 | IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start) | |
2486 | #else | |
2487 | in_solib_dynsym_resolve_code (ecs->stop_func_start) | |
2488 | #endif | |
2489 | ) | |
1b2bfbb9 RC |
2490 | { |
2491 | struct symtab_and_line sr_sal; | |
2492 | init_sal (&sr_sal); | |
2493 | sr_sal.pc = ecs->stop_func_start; | |
2494 | ||
44cbf7b5 | 2495 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
8fb3e588 AC |
2496 | keep_going (ecs); |
2497 | return; | |
1b2bfbb9 RC |
2498 | } |
2499 | ||
95918acb | 2500 | /* If we have line number information for the function we are |
8fb3e588 | 2501 | thinking of stepping into, step into it. |
95918acb | 2502 | |
8fb3e588 AC |
2503 | If there are several symtabs at that PC (e.g. with include |
2504 | files), just want to know whether *any* of them have line | |
2505 | numbers. find_pc_line handles this. */ | |
95918acb AC |
2506 | { |
2507 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 2508 | |
95918acb AC |
2509 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2510 | if (tmp_sal.line != 0) | |
2511 | { | |
2512 | step_into_function (ecs); | |
2513 | return; | |
2514 | } | |
2515 | } | |
2516 | ||
2517 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
2518 | set, we stop the step so that the user has a chance to switch |
2519 | in assembly mode. */ | |
95918acb AC |
2520 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) |
2521 | { | |
2522 | stop_step = 1; | |
2523 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2524 | stop_stepping (ecs); | |
2525 | return; | |
2526 | } | |
2527 | ||
2528 | /* Set a breakpoint at callee's return address (the address at | |
8fb3e588 | 2529 | which the caller will resume). */ |
14e60db5 | 2530 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
95918acb | 2531 | keep_going (ecs); |
488f131b | 2532 | return; |
488f131b | 2533 | } |
c906108c | 2534 | |
488f131b JB |
2535 | /* If we're in the return path from a shared library trampoline, |
2536 | we want to proceed through the trampoline when stepping. */ | |
2537 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2538 | { | |
488f131b | 2539 | /* Determine where this trampoline returns. */ |
5cf4d23a | 2540 | CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); |
c906108c | 2541 | |
527159b7 | 2542 | if (debug_infrun) |
8a9de0e4 | 2543 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n"); |
527159b7 | 2544 | |
488f131b | 2545 | /* Only proceed through if we know where it's going. */ |
d764a824 | 2546 | if (real_stop_pc) |
488f131b JB |
2547 | { |
2548 | /* And put the step-breakpoint there and go until there. */ | |
2549 | struct symtab_and_line sr_sal; | |
2550 | ||
fe39c653 | 2551 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 2552 | sr_sal.pc = real_stop_pc; |
488f131b | 2553 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
44cbf7b5 AC |
2554 | |
2555 | /* Do not specify what the fp should be when we stop since | |
2556 | on some machines the prologue is where the new fp value | |
2557 | is established. */ | |
2558 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); | |
c906108c | 2559 | |
488f131b JB |
2560 | /* Restart without fiddling with the step ranges or |
2561 | other state. */ | |
2562 | keep_going (ecs); | |
2563 | return; | |
2564 | } | |
2565 | } | |
c906108c | 2566 | |
7ed0fe66 DJ |
2567 | ecs->sal = find_pc_line (stop_pc, 0); |
2568 | ||
1b2bfbb9 RC |
2569 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
2570 | the trampoline processing logic, however, there are some trampolines | |
2571 | that have no names, so we should do trampoline handling first. */ | |
2572 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
7ed0fe66 DJ |
2573 | && ecs->stop_func_name == NULL |
2574 | && ecs->sal.line == 0) | |
1b2bfbb9 | 2575 | { |
527159b7 | 2576 | if (debug_infrun) |
8a9de0e4 | 2577 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n"); |
527159b7 | 2578 | |
1b2bfbb9 | 2579 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
2580 | undebuggable function (where there is no debugging information |
2581 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
2582 | inferior stopped). Since we want to skip this kind of code, |
2583 | we keep going until the inferior returns from this | |
14e60db5 DJ |
2584 | function - unless the user has asked us not to (via |
2585 | set step-mode) or we no longer know how to get back | |
2586 | to the call site. */ | |
2587 | if (step_stop_if_no_debug | |
2588 | || !frame_id_p (frame_unwind_id (get_current_frame ()))) | |
1b2bfbb9 RC |
2589 | { |
2590 | /* If we have no line number and the step-stop-if-no-debug | |
2591 | is set, we stop the step so that the user has a chance to | |
2592 | switch in assembly mode. */ | |
2593 | stop_step = 1; | |
2594 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2595 | stop_stepping (ecs); | |
2596 | return; | |
2597 | } | |
2598 | else | |
2599 | { | |
2600 | /* Set a breakpoint at callee's return address (the address | |
2601 | at which the caller will resume). */ | |
14e60db5 | 2602 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
1b2bfbb9 RC |
2603 | keep_going (ecs); |
2604 | return; | |
2605 | } | |
2606 | } | |
2607 | ||
2608 | if (step_range_end == 1) | |
2609 | { | |
2610 | /* It is stepi or nexti. We always want to stop stepping after | |
2611 | one instruction. */ | |
527159b7 | 2612 | if (debug_infrun) |
8a9de0e4 | 2613 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
1b2bfbb9 RC |
2614 | stop_step = 1; |
2615 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2616 | stop_stepping (ecs); | |
2617 | return; | |
2618 | } | |
2619 | ||
488f131b JB |
2620 | if (ecs->sal.line == 0) |
2621 | { | |
2622 | /* We have no line number information. That means to stop | |
2623 | stepping (does this always happen right after one instruction, | |
2624 | when we do "s" in a function with no line numbers, | |
2625 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 2626 | if (debug_infrun) |
8a9de0e4 | 2627 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
488f131b JB |
2628 | stop_step = 1; |
2629 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2630 | stop_stepping (ecs); | |
2631 | return; | |
2632 | } | |
c906108c | 2633 | |
488f131b JB |
2634 | if ((stop_pc == ecs->sal.pc) |
2635 | && (ecs->current_line != ecs->sal.line | |
2636 | || ecs->current_symtab != ecs->sal.symtab)) | |
2637 | { | |
2638 | /* We are at the start of a different line. So stop. Note that | |
2639 | we don't stop if we step into the middle of a different line. | |
2640 | That is said to make things like for (;;) statements work | |
2641 | better. */ | |
527159b7 | 2642 | if (debug_infrun) |
8a9de0e4 | 2643 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n"); |
488f131b JB |
2644 | stop_step = 1; |
2645 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2646 | stop_stepping (ecs); | |
2647 | return; | |
2648 | } | |
c906108c | 2649 | |
488f131b | 2650 | /* We aren't done stepping. |
c906108c | 2651 | |
488f131b JB |
2652 | Optimize by setting the stepping range to the line. |
2653 | (We might not be in the original line, but if we entered a | |
2654 | new line in mid-statement, we continue stepping. This makes | |
2655 | things like for(;;) statements work better.) */ | |
c906108c | 2656 | |
488f131b | 2657 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
c5aa993b | 2658 | { |
488f131b JB |
2659 | /* If this is the last line of the function, don't keep stepping |
2660 | (it would probably step us out of the function). | |
2661 | This is particularly necessary for a one-line function, | |
2662 | in which after skipping the prologue we better stop even though | |
2663 | we will be in mid-line. */ | |
527159b7 | 2664 | if (debug_infrun) |
8a9de0e4 | 2665 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different function\n"); |
488f131b JB |
2666 | stop_step = 1; |
2667 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2668 | stop_stepping (ecs); | |
2669 | return; | |
c5aa993b | 2670 | } |
488f131b JB |
2671 | step_range_start = ecs->sal.pc; |
2672 | step_range_end = ecs->sal.end; | |
aa0cd9c1 | 2673 | step_frame_id = get_frame_id (get_current_frame ()); |
488f131b JB |
2674 | ecs->current_line = ecs->sal.line; |
2675 | ecs->current_symtab = ecs->sal.symtab; | |
2676 | ||
aa0cd9c1 AC |
2677 | /* In the case where we just stepped out of a function into the |
2678 | middle of a line of the caller, continue stepping, but | |
2679 | step_frame_id must be modified to current frame */ | |
65815ea1 AC |
2680 | #if 0 |
2681 | /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too | |
2682 | generous. It will trigger on things like a step into a frameless | |
2683 | stackless leaf function. I think the logic should instead look | |
2684 | at the unwound frame ID has that should give a more robust | |
2685 | indication of what happened. */ | |
8fb3e588 AC |
2686 | if (step - ID == current - ID) |
2687 | still stepping in same function; | |
2688 | else if (step - ID == unwind (current - ID)) | |
2689 | stepped into a function; | |
2690 | else | |
2691 | stepped out of a function; | |
2692 | /* Of course this assumes that the frame ID unwind code is robust | |
2693 | and we're willing to introduce frame unwind logic into this | |
2694 | function. Fortunately, those days are nearly upon us. */ | |
65815ea1 | 2695 | #endif |
488f131b | 2696 | { |
aa0cd9c1 AC |
2697 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
2698 | if (!(frame_id_inner (current_frame, step_frame_id))) | |
2699 | step_frame_id = current_frame; | |
488f131b | 2700 | } |
c906108c | 2701 | |
527159b7 | 2702 | if (debug_infrun) |
8a9de0e4 | 2703 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 2704 | keep_going (ecs); |
104c1213 JM |
2705 | } |
2706 | ||
2707 | /* Are we in the middle of stepping? */ | |
2708 | ||
2709 | static int | |
2710 | currently_stepping (struct execution_control_state *ecs) | |
2711 | { | |
d303a6c7 | 2712 | return ((!ecs->handling_longjmp |
104c1213 JM |
2713 | && ((step_range_end && step_resume_breakpoint == NULL) |
2714 | || trap_expected)) | |
2715 | || ecs->stepping_through_solib_after_catch | |
2716 | || bpstat_should_step ()); | |
2717 | } | |
c906108c | 2718 | |
c2c6d25f JM |
2719 | /* Subroutine call with source code we should not step over. Do step |
2720 | to the first line of code in it. */ | |
2721 | ||
2722 | static void | |
2723 | step_into_function (struct execution_control_state *ecs) | |
2724 | { | |
2725 | struct symtab *s; | |
2726 | struct symtab_and_line sr_sal; | |
2727 | ||
2728 | s = find_pc_symtab (stop_pc); | |
2729 | if (s && s->language != language_asm) | |
2730 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
2731 | ||
2732 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2733 | /* Use the step_resume_break to step until the end of the prologue, | |
2734 | even if that involves jumps (as it seems to on the vax under | |
2735 | 4.2). */ | |
2736 | /* If the prologue ends in the middle of a source line, continue to | |
2737 | the end of that source line (if it is still within the function). | |
2738 | Otherwise, just go to end of prologue. */ | |
c2c6d25f JM |
2739 | if (ecs->sal.end |
2740 | && ecs->sal.pc != ecs->stop_func_start | |
2741 | && ecs->sal.end < ecs->stop_func_end) | |
2742 | ecs->stop_func_start = ecs->sal.end; | |
c2c6d25f | 2743 | |
2dbd5e30 KB |
2744 | /* Architectures which require breakpoint adjustment might not be able |
2745 | to place a breakpoint at the computed address. If so, the test | |
2746 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
2747 | ecs->stop_func_start to an address at which a breakpoint may be | |
2748 | legitimately placed. | |
8fb3e588 | 2749 | |
2dbd5e30 KB |
2750 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
2751 | made, GDB will enter an infinite loop when stepping through | |
2752 | optimized code consisting of VLIW instructions which contain | |
2753 | subinstructions corresponding to different source lines. On | |
2754 | FR-V, it's not permitted to place a breakpoint on any but the | |
2755 | first subinstruction of a VLIW instruction. When a breakpoint is | |
2756 | set, GDB will adjust the breakpoint address to the beginning of | |
2757 | the VLIW instruction. Thus, we need to make the corresponding | |
2758 | adjustment here when computing the stop address. */ | |
8fb3e588 | 2759 | |
2dbd5e30 KB |
2760 | if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) |
2761 | { | |
2762 | ecs->stop_func_start | |
2763 | = gdbarch_adjust_breakpoint_address (current_gdbarch, | |
8fb3e588 | 2764 | ecs->stop_func_start); |
2dbd5e30 KB |
2765 | } |
2766 | ||
c2c6d25f JM |
2767 | if (ecs->stop_func_start == stop_pc) |
2768 | { | |
2769 | /* We are already there: stop now. */ | |
2770 | stop_step = 1; | |
488f131b | 2771 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2772 | stop_stepping (ecs); |
2773 | return; | |
2774 | } | |
2775 | else | |
2776 | { | |
2777 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 2778 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
2779 | sr_sal.pc = ecs->stop_func_start; |
2780 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
44cbf7b5 | 2781 | |
c2c6d25f | 2782 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
2783 | some machines the prologue is where the new fp value is |
2784 | established. */ | |
44cbf7b5 | 2785 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c2c6d25f JM |
2786 | |
2787 | /* And make sure stepping stops right away then. */ | |
2788 | step_range_end = step_range_start; | |
2789 | } | |
2790 | keep_going (ecs); | |
2791 | } | |
d4f3574e | 2792 | |
44cbf7b5 AC |
2793 | /* Insert a "step resume breakpoint" at SR_SAL with frame ID SR_ID. |
2794 | This is used to both functions and to skip over code. */ | |
2795 | ||
2796 | static void | |
2797 | insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, | |
2798 | struct frame_id sr_id) | |
2799 | { | |
2800 | /* There should never be more than one step-resume breakpoint per | |
2801 | thread, so we should never be setting a new | |
2802 | step_resume_breakpoint when one is already active. */ | |
2803 | gdb_assert (step_resume_breakpoint == NULL); | |
2804 | step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id, | |
2805 | bp_step_resume); | |
2806 | if (breakpoints_inserted) | |
2807 | insert_breakpoints (); | |
2808 | } | |
7ce450bd | 2809 | |
14e60db5 DJ |
2810 | /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used |
2811 | to skip a potential signal handler. | |
7ce450bd | 2812 | |
14e60db5 DJ |
2813 | This is called with the interrupted function's frame. The signal |
2814 | handler, when it returns, will resume the interrupted function at | |
2815 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
2816 | |
2817 | static void | |
44cbf7b5 | 2818 | insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
2819 | { |
2820 | struct symtab_and_line sr_sal; | |
2821 | ||
d303a6c7 AC |
2822 | init_sal (&sr_sal); /* initialize to zeros */ |
2823 | ||
7ce450bd | 2824 | sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (return_frame)); |
d303a6c7 AC |
2825 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2826 | ||
44cbf7b5 | 2827 | insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame)); |
d303a6c7 AC |
2828 | } |
2829 | ||
14e60db5 DJ |
2830 | /* Similar to insert_step_resume_breakpoint_at_frame, except |
2831 | but a breakpoint at the previous frame's PC. This is used to | |
2832 | skip a function after stepping into it (for "next" or if the called | |
2833 | function has no debugging information). | |
2834 | ||
2835 | The current function has almost always been reached by single | |
2836 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
2837 | current function, and the breakpoint will be set at the caller's | |
2838 | resume address. | |
2839 | ||
2840 | This is a separate function rather than reusing | |
2841 | insert_step_resume_breakpoint_at_frame in order to avoid | |
2842 | get_prev_frame, which may stop prematurely (see the implementation | |
2843 | of frame_unwind_id for an example). */ | |
2844 | ||
2845 | static void | |
2846 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
2847 | { | |
2848 | struct symtab_and_line sr_sal; | |
2849 | ||
2850 | /* We shouldn't have gotten here if we don't know where the call site | |
2851 | is. */ | |
2852 | gdb_assert (frame_id_p (frame_unwind_id (next_frame))); | |
2853 | ||
2854 | init_sal (&sr_sal); /* initialize to zeros */ | |
2855 | ||
2856 | sr_sal.pc = ADDR_BITS_REMOVE (frame_pc_unwind (next_frame)); | |
2857 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2858 | ||
2859 | insert_step_resume_breakpoint_at_sal (sr_sal, frame_unwind_id (next_frame)); | |
2860 | } | |
2861 | ||
104c1213 JM |
2862 | static void |
2863 | stop_stepping (struct execution_control_state *ecs) | |
2864 | { | |
527159b7 | 2865 | if (debug_infrun) |
8a9de0e4 | 2866 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
527159b7 | 2867 | |
cd0fc7c3 SS |
2868 | /* Let callers know we don't want to wait for the inferior anymore. */ |
2869 | ecs->wait_some_more = 0; | |
2870 | } | |
2871 | ||
d4f3574e SS |
2872 | /* This function handles various cases where we need to continue |
2873 | waiting for the inferior. */ | |
2874 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
2875 | ||
2876 | static void | |
2877 | keep_going (struct execution_control_state *ecs) | |
2878 | { | |
d4f3574e | 2879 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 2880 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e | 2881 | |
d4f3574e SS |
2882 | /* If we did not do break;, it means we should keep running the |
2883 | inferior and not return to debugger. */ | |
2884 | ||
2885 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
2886 | { | |
2887 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
2888 | the inferior, else we'd have done a break above) and we |
2889 | haven't yet gotten our trap. Simply continue. */ | |
d4f3574e SS |
2890 | resume (currently_stepping (ecs), stop_signal); |
2891 | } | |
2892 | else | |
2893 | { | |
2894 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
2895 | anyway (the user asked that this signal be passed to the |
2896 | child) | |
2897 | -- or -- | |
2898 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2899 | decided we should resume from it. | |
d4f3574e | 2900 | |
68f53502 | 2901 | We're going to run this baby now! */ |
d4f3574e | 2902 | |
68f53502 | 2903 | if (!breakpoints_inserted && !ecs->another_trap) |
d4f3574e | 2904 | { |
569631c6 UW |
2905 | /* Stop stepping when inserting breakpoints |
2906 | has failed. */ | |
2907 | if (insert_breakpoints () != 0) | |
d4f3574e SS |
2908 | { |
2909 | stop_stepping (ecs); | |
2910 | return; | |
2911 | } | |
2912 | breakpoints_inserted = 1; | |
2913 | } | |
2914 | ||
2915 | trap_expected = ecs->another_trap; | |
2916 | ||
2917 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
2918 | specifies that such a signal should be delivered to the |
2919 | target program). | |
2920 | ||
2921 | Typically, this would occure when a user is debugging a | |
2922 | target monitor on a simulator: the target monitor sets a | |
2923 | breakpoint; the simulator encounters this break-point and | |
2924 | halts the simulation handing control to GDB; GDB, noteing | |
2925 | that the break-point isn't valid, returns control back to the | |
2926 | simulator; the simulator then delivers the hardware | |
2927 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
2928 | ||
2929 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
2930 | stop_signal = TARGET_SIGNAL_0; |
2931 | ||
d4f3574e SS |
2932 | |
2933 | resume (currently_stepping (ecs), stop_signal); | |
2934 | } | |
2935 | ||
488f131b | 2936 | prepare_to_wait (ecs); |
d4f3574e SS |
2937 | } |
2938 | ||
104c1213 JM |
2939 | /* This function normally comes after a resume, before |
2940 | handle_inferior_event exits. It takes care of any last bits of | |
2941 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 2942 | |
104c1213 JM |
2943 | static void |
2944 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 2945 | { |
527159b7 | 2946 | if (debug_infrun) |
8a9de0e4 | 2947 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 JM |
2948 | if (ecs->infwait_state == infwait_normal_state) |
2949 | { | |
2950 | overlay_cache_invalid = 1; | |
2951 | ||
2952 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
2953 | target_wait because they can be loaded from the target while |
2954 | in target_wait. This makes remote debugging a bit more | |
2955 | efficient for those targets that provide critical registers | |
2956 | as part of their normal status mechanism. */ | |
104c1213 JM |
2957 | |
2958 | registers_changed (); | |
39f77062 | 2959 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
2960 | ecs->wp = &(ecs->ws); |
2961 | } | |
2962 | /* This is the old end of the while loop. Let everybody know we | |
2963 | want to wait for the inferior some more and get called again | |
2964 | soon. */ | |
2965 | ecs->wait_some_more = 1; | |
c906108c | 2966 | } |
11cf8741 JM |
2967 | |
2968 | /* Print why the inferior has stopped. We always print something when | |
2969 | the inferior exits, or receives a signal. The rest of the cases are | |
2970 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
2971 | there should be a call to this function from handle_inferior_event() | |
2972 | each time stop_stepping() is called.*/ | |
2973 | static void | |
2974 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
2975 | { | |
2976 | switch (stop_reason) | |
2977 | { | |
11cf8741 JM |
2978 | case END_STEPPING_RANGE: |
2979 | /* We are done with a step/next/si/ni command. */ | |
2980 | /* For now print nothing. */ | |
fb40c209 | 2981 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 2982 | operation for n > 1 */ |
fb40c209 | 2983 | if (!step_multi || !stop_step) |
9dc5e2a9 | 2984 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
2985 | ui_out_field_string |
2986 | (uiout, "reason", | |
2987 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
11cf8741 | 2988 | break; |
11cf8741 JM |
2989 | case SIGNAL_EXITED: |
2990 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 2991 | annotate_signalled (); |
9dc5e2a9 | 2992 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
2993 | ui_out_field_string |
2994 | (uiout, "reason", | |
2995 | async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8b93c638 JM |
2996 | ui_out_text (uiout, "\nProgram terminated with signal "); |
2997 | annotate_signal_name (); | |
488f131b JB |
2998 | ui_out_field_string (uiout, "signal-name", |
2999 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
3000 | annotate_signal_name_end (); |
3001 | ui_out_text (uiout, ", "); | |
3002 | annotate_signal_string (); | |
488f131b JB |
3003 | ui_out_field_string (uiout, "signal-meaning", |
3004 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
3005 | annotate_signal_string_end (); |
3006 | ui_out_text (uiout, ".\n"); | |
3007 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
3008 | break; |
3009 | case EXITED: | |
3010 | /* The inferior program is finished. */ | |
8b93c638 JM |
3011 | annotate_exited (stop_info); |
3012 | if (stop_info) | |
3013 | { | |
9dc5e2a9 | 3014 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3015 | ui_out_field_string (uiout, "reason", |
3016 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
8b93c638 | 3017 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
3018 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
3019 | (unsigned int) stop_info); | |
8b93c638 JM |
3020 | ui_out_text (uiout, ".\n"); |
3021 | } | |
3022 | else | |
3023 | { | |
9dc5e2a9 | 3024 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3025 | ui_out_field_string |
3026 | (uiout, "reason", | |
3027 | async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
8b93c638 JM |
3028 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
3029 | } | |
f17517ea AS |
3030 | /* Support the --return-child-result option. */ |
3031 | return_child_result_value = stop_info; | |
11cf8741 JM |
3032 | break; |
3033 | case SIGNAL_RECEIVED: | |
3034 | /* Signal received. The signal table tells us to print about | |
3035 | it. */ | |
8b93c638 JM |
3036 | annotate_signal (); |
3037 | ui_out_text (uiout, "\nProgram received signal "); | |
3038 | annotate_signal_name (); | |
84c6c83c | 3039 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3040 | ui_out_field_string |
3041 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b JB |
3042 | ui_out_field_string (uiout, "signal-name", |
3043 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
3044 | annotate_signal_name_end (); |
3045 | ui_out_text (uiout, ", "); | |
3046 | annotate_signal_string (); | |
488f131b JB |
3047 | ui_out_field_string (uiout, "signal-meaning", |
3048 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
3049 | annotate_signal_string_end (); |
3050 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
3051 | break; |
3052 | default: | |
8e65ff28 | 3053 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 3054 | _("print_stop_reason: unrecognized enum value")); |
11cf8741 JM |
3055 | break; |
3056 | } | |
3057 | } | |
c906108c | 3058 | \f |
43ff13b4 | 3059 | |
c906108c SS |
3060 | /* Here to return control to GDB when the inferior stops for real. |
3061 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
3062 | ||
3063 | STOP_PRINT_FRAME nonzero means print the executing frame | |
3064 | (pc, function, args, file, line number and line text). | |
3065 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
3066 | attempting to insert breakpoints. */ | |
3067 | ||
3068 | void | |
96baa820 | 3069 | normal_stop (void) |
c906108c | 3070 | { |
73b65bb0 DJ |
3071 | struct target_waitstatus last; |
3072 | ptid_t last_ptid; | |
3073 | ||
3074 | get_last_target_status (&last_ptid, &last); | |
3075 | ||
c906108c SS |
3076 | /* As with the notification of thread events, we want to delay |
3077 | notifying the user that we've switched thread context until | |
3078 | the inferior actually stops. | |
3079 | ||
73b65bb0 DJ |
3080 | There's no point in saying anything if the inferior has exited. |
3081 | Note that SIGNALLED here means "exited with a signal", not | |
3082 | "received a signal". */ | |
488f131b | 3083 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
73b65bb0 DJ |
3084 | && target_has_execution |
3085 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
3086 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
3087 | { |
3088 | target_terminal_ours_for_output (); | |
a3f17187 | 3089 | printf_filtered (_("[Switching to %s]\n"), |
39f77062 KB |
3090 | target_pid_or_tid_to_str (inferior_ptid)); |
3091 | previous_inferior_ptid = inferior_ptid; | |
c906108c | 3092 | } |
c906108c | 3093 | |
4fa8626c | 3094 | /* NOTE drow/2004-01-17: Is this still necessary? */ |
c906108c SS |
3095 | /* Make sure that the current_frame's pc is correct. This |
3096 | is a correction for setting up the frame info before doing | |
3097 | DECR_PC_AFTER_BREAK */ | |
b87efeee AC |
3098 | if (target_has_execution) |
3099 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to | |
3100 | DECR_PC_AFTER_BREAK, the program counter can change. Ask the | |
3101 | frame code to check for this and sort out any resultant mess. | |
3102 | DECR_PC_AFTER_BREAK needs to just go away. */ | |
2f107107 | 3103 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
c906108c | 3104 | |
c906108c SS |
3105 | if (target_has_execution && breakpoints_inserted) |
3106 | { | |
3107 | if (remove_breakpoints ()) | |
3108 | { | |
3109 | target_terminal_ours_for_output (); | |
a3f17187 AC |
3110 | printf_filtered (_("\ |
3111 | Cannot remove breakpoints because program is no longer writable.\n\ | |
3112 | It might be running in another process.\n\ | |
3113 | Further execution is probably impossible.\n")); | |
c906108c SS |
3114 | } |
3115 | } | |
3116 | breakpoints_inserted = 0; | |
3117 | ||
3118 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3119 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3120 | ||
3121 | breakpoint_auto_delete (stop_bpstat); | |
3122 | ||
3123 | /* If an auto-display called a function and that got a signal, | |
3124 | delete that auto-display to avoid an infinite recursion. */ | |
3125 | ||
3126 | if (stopped_by_random_signal) | |
3127 | disable_current_display (); | |
3128 | ||
3129 | /* Don't print a message if in the middle of doing a "step n" | |
3130 | operation for n > 1 */ | |
3131 | if (step_multi && stop_step) | |
3132 | goto done; | |
3133 | ||
3134 | target_terminal_ours (); | |
3135 | ||
7abfe014 DJ |
3136 | /* Set the current source location. This will also happen if we |
3137 | display the frame below, but the current SAL will be incorrect | |
3138 | during a user hook-stop function. */ | |
3139 | if (target_has_stack && !stop_stack_dummy) | |
3140 | set_current_sal_from_frame (get_current_frame (), 1); | |
3141 | ||
5913bcb0 AC |
3142 | /* Look up the hook_stop and run it (CLI internally handles problem |
3143 | of stop_command's pre-hook not existing). */ | |
3144 | if (stop_command) | |
3145 | catch_errors (hook_stop_stub, stop_command, | |
3146 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
3147 | |
3148 | if (!target_has_stack) | |
3149 | { | |
3150 | ||
3151 | goto done; | |
3152 | } | |
3153 | ||
3154 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3155 | and current location is based on that. | |
3156 | Don't do this on return from a stack dummy routine, | |
3157 | or if the program has exited. */ | |
3158 | ||
3159 | if (!stop_stack_dummy) | |
3160 | { | |
0f7d239c | 3161 | select_frame (get_current_frame ()); |
c906108c SS |
3162 | |
3163 | /* Print current location without a level number, if | |
c5aa993b JM |
3164 | we have changed functions or hit a breakpoint. |
3165 | Print source line if we have one. | |
3166 | bpstat_print() contains the logic deciding in detail | |
3167 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3168 | |
206415a3 | 3169 | if (stop_print_frame) |
c906108c SS |
3170 | { |
3171 | int bpstat_ret; | |
3172 | int source_flag; | |
917317f4 | 3173 | int do_frame_printing = 1; |
c906108c SS |
3174 | |
3175 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3176 | switch (bpstat_ret) |
3177 | { | |
3178 | case PRINT_UNKNOWN: | |
aa0cd9c1 | 3179 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
3180 | (or should) carry around the function and does (or |
3181 | should) use that when doing a frame comparison. */ | |
917317f4 | 3182 | if (stop_step |
aa0cd9c1 AC |
3183 | && frame_id_eq (step_frame_id, |
3184 | get_frame_id (get_current_frame ())) | |
917317f4 | 3185 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3186 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3187 | else |
488f131b | 3188 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3189 | break; |
3190 | case PRINT_SRC_AND_LOC: | |
488f131b | 3191 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3192 | break; |
3193 | case PRINT_SRC_ONLY: | |
c5394b80 | 3194 | source_flag = SRC_LINE; |
917317f4 JM |
3195 | break; |
3196 | case PRINT_NOTHING: | |
488f131b | 3197 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3198 | do_frame_printing = 0; |
3199 | break; | |
3200 | default: | |
e2e0b3e5 | 3201 | internal_error (__FILE__, __LINE__, _("Unknown value.")); |
917317f4 | 3202 | } |
fb40c209 | 3203 | /* For mi, have the same behavior every time we stop: |
488f131b | 3204 | print everything but the source line. */ |
9dc5e2a9 | 3205 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3206 | source_flag = LOC_AND_ADDRESS; |
c906108c | 3207 | |
9dc5e2a9 | 3208 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 | 3209 | ui_out_field_int (uiout, "thread-id", |
488f131b | 3210 | pid_to_thread_id (inferior_ptid)); |
c906108c SS |
3211 | /* The behavior of this routine with respect to the source |
3212 | flag is: | |
c5394b80 JM |
3213 | SRC_LINE: Print only source line |
3214 | LOCATION: Print only location | |
3215 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3216 | if (do_frame_printing) |
b04f3ab4 | 3217 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
3218 | |
3219 | /* Display the auto-display expressions. */ | |
3220 | do_displays (); | |
3221 | } | |
3222 | } | |
3223 | ||
3224 | /* Save the function value return registers, if we care. | |
3225 | We might be about to restore their previous contents. */ | |
3226 | if (proceed_to_finish) | |
72cec141 AC |
3227 | /* NB: The copy goes through to the target picking up the value of |
3228 | all the registers. */ | |
3229 | regcache_cpy (stop_registers, current_regcache); | |
c906108c SS |
3230 | |
3231 | if (stop_stack_dummy) | |
3232 | { | |
dbe9fe58 AC |
3233 | /* Pop the empty frame that contains the stack dummy. POP_FRAME |
3234 | ends with a setting of the current frame, so we can use that | |
3235 | next. */ | |
3236 | frame_pop (get_current_frame ()); | |
c906108c | 3237 | /* Set stop_pc to what it was before we called the function. |
c5aa993b JM |
3238 | Can't rely on restore_inferior_status because that only gets |
3239 | called if we don't stop in the called function. */ | |
c906108c | 3240 | stop_pc = read_pc (); |
0f7d239c | 3241 | select_frame (get_current_frame ()); |
c906108c SS |
3242 | } |
3243 | ||
c906108c SS |
3244 | done: |
3245 | annotate_stopped (); | |
7a464420 | 3246 | observer_notify_normal_stop (stop_bpstat); |
c906108c SS |
3247 | } |
3248 | ||
3249 | static int | |
96baa820 | 3250 | hook_stop_stub (void *cmd) |
c906108c | 3251 | { |
5913bcb0 | 3252 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3253 | return (0); |
3254 | } | |
3255 | \f | |
c5aa993b | 3256 | int |
96baa820 | 3257 | signal_stop_state (int signo) |
c906108c SS |
3258 | { |
3259 | return signal_stop[signo]; | |
3260 | } | |
3261 | ||
c5aa993b | 3262 | int |
96baa820 | 3263 | signal_print_state (int signo) |
c906108c SS |
3264 | { |
3265 | return signal_print[signo]; | |
3266 | } | |
3267 | ||
c5aa993b | 3268 | int |
96baa820 | 3269 | signal_pass_state (int signo) |
c906108c SS |
3270 | { |
3271 | return signal_program[signo]; | |
3272 | } | |
3273 | ||
488f131b | 3274 | int |
7bda5e4a | 3275 | signal_stop_update (int signo, int state) |
d4f3574e SS |
3276 | { |
3277 | int ret = signal_stop[signo]; | |
3278 | signal_stop[signo] = state; | |
3279 | return ret; | |
3280 | } | |
3281 | ||
488f131b | 3282 | int |
7bda5e4a | 3283 | signal_print_update (int signo, int state) |
d4f3574e SS |
3284 | { |
3285 | int ret = signal_print[signo]; | |
3286 | signal_print[signo] = state; | |
3287 | return ret; | |
3288 | } | |
3289 | ||
488f131b | 3290 | int |
7bda5e4a | 3291 | signal_pass_update (int signo, int state) |
d4f3574e SS |
3292 | { |
3293 | int ret = signal_program[signo]; | |
3294 | signal_program[signo] = state; | |
3295 | return ret; | |
3296 | } | |
3297 | ||
c906108c | 3298 | static void |
96baa820 | 3299 | sig_print_header (void) |
c906108c | 3300 | { |
a3f17187 AC |
3301 | printf_filtered (_("\ |
3302 | Signal Stop\tPrint\tPass to program\tDescription\n")); | |
c906108c SS |
3303 | } |
3304 | ||
3305 | static void | |
96baa820 | 3306 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3307 | { |
3308 | char *name = target_signal_to_name (oursig); | |
3309 | int name_padding = 13 - strlen (name); | |
96baa820 | 3310 | |
c906108c SS |
3311 | if (name_padding <= 0) |
3312 | name_padding = 0; | |
3313 | ||
3314 | printf_filtered ("%s", name); | |
488f131b | 3315 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
3316 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3317 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3318 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3319 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3320 | } | |
3321 | ||
3322 | /* Specify how various signals in the inferior should be handled. */ | |
3323 | ||
3324 | static void | |
96baa820 | 3325 | handle_command (char *args, int from_tty) |
c906108c SS |
3326 | { |
3327 | char **argv; | |
3328 | int digits, wordlen; | |
3329 | int sigfirst, signum, siglast; | |
3330 | enum target_signal oursig; | |
3331 | int allsigs; | |
3332 | int nsigs; | |
3333 | unsigned char *sigs; | |
3334 | struct cleanup *old_chain; | |
3335 | ||
3336 | if (args == NULL) | |
3337 | { | |
e2e0b3e5 | 3338 | error_no_arg (_("signal to handle")); |
c906108c SS |
3339 | } |
3340 | ||
3341 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3342 | ||
3343 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3344 | sigs = (unsigned char *) alloca (nsigs); | |
3345 | memset (sigs, 0, nsigs); | |
3346 | ||
3347 | /* Break the command line up into args. */ | |
3348 | ||
3349 | argv = buildargv (args); | |
3350 | if (argv == NULL) | |
3351 | { | |
3352 | nomem (0); | |
3353 | } | |
7a292a7a | 3354 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3355 | |
3356 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3357 | actions. Signal numbers and signal names may be interspersed with | |
3358 | actions, with the actions being performed for all signals cumulatively | |
3359 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3360 | ||
3361 | while (*argv != NULL) | |
3362 | { | |
3363 | wordlen = strlen (*argv); | |
3364 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3365 | {; | |
3366 | } | |
3367 | allsigs = 0; | |
3368 | sigfirst = siglast = -1; | |
3369 | ||
3370 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3371 | { | |
3372 | /* Apply action to all signals except those used by the | |
3373 | debugger. Silently skip those. */ | |
3374 | allsigs = 1; | |
3375 | sigfirst = 0; | |
3376 | siglast = nsigs - 1; | |
3377 | } | |
3378 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3379 | { | |
3380 | SET_SIGS (nsigs, sigs, signal_stop); | |
3381 | SET_SIGS (nsigs, sigs, signal_print); | |
3382 | } | |
3383 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3384 | { | |
3385 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3386 | } | |
3387 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3388 | { | |
3389 | SET_SIGS (nsigs, sigs, signal_print); | |
3390 | } | |
3391 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3392 | { | |
3393 | SET_SIGS (nsigs, sigs, signal_program); | |
3394 | } | |
3395 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3396 | { | |
3397 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3398 | } | |
3399 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3400 | { | |
3401 | SET_SIGS (nsigs, sigs, signal_program); | |
3402 | } | |
3403 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3404 | { | |
3405 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3406 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3407 | } | |
3408 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3409 | { | |
3410 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3411 | } | |
3412 | else if (digits > 0) | |
3413 | { | |
3414 | /* It is numeric. The numeric signal refers to our own | |
3415 | internal signal numbering from target.h, not to host/target | |
3416 | signal number. This is a feature; users really should be | |
3417 | using symbolic names anyway, and the common ones like | |
3418 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3419 | ||
3420 | sigfirst = siglast = (int) | |
3421 | target_signal_from_command (atoi (*argv)); | |
3422 | if ((*argv)[digits] == '-') | |
3423 | { | |
3424 | siglast = (int) | |
3425 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3426 | } | |
3427 | if (sigfirst > siglast) | |
3428 | { | |
3429 | /* Bet he didn't figure we'd think of this case... */ | |
3430 | signum = sigfirst; | |
3431 | sigfirst = siglast; | |
3432 | siglast = signum; | |
3433 | } | |
3434 | } | |
3435 | else | |
3436 | { | |
3437 | oursig = target_signal_from_name (*argv); | |
3438 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3439 | { | |
3440 | sigfirst = siglast = (int) oursig; | |
3441 | } | |
3442 | else | |
3443 | { | |
3444 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 3445 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
3446 | } |
3447 | } | |
3448 | ||
3449 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3450 | which signals to apply actions to. */ |
c906108c SS |
3451 | |
3452 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3453 | { | |
3454 | switch ((enum target_signal) signum) | |
3455 | { | |
3456 | case TARGET_SIGNAL_TRAP: | |
3457 | case TARGET_SIGNAL_INT: | |
3458 | if (!allsigs && !sigs[signum]) | |
3459 | { | |
3460 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 3461 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
3462 | { |
3463 | sigs[signum] = 1; | |
3464 | } | |
3465 | else | |
3466 | { | |
a3f17187 | 3467 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
3468 | gdb_flush (gdb_stdout); |
3469 | } | |
3470 | } | |
3471 | break; | |
3472 | case TARGET_SIGNAL_0: | |
3473 | case TARGET_SIGNAL_DEFAULT: | |
3474 | case TARGET_SIGNAL_UNKNOWN: | |
3475 | /* Make sure that "all" doesn't print these. */ | |
3476 | break; | |
3477 | default: | |
3478 | sigs[signum] = 1; | |
3479 | break; | |
3480 | } | |
3481 | } | |
3482 | ||
3483 | argv++; | |
3484 | } | |
3485 | ||
39f77062 | 3486 | target_notice_signals (inferior_ptid); |
c906108c SS |
3487 | |
3488 | if (from_tty) | |
3489 | { | |
3490 | /* Show the results. */ | |
3491 | sig_print_header (); | |
3492 | for (signum = 0; signum < nsigs; signum++) | |
3493 | { | |
3494 | if (sigs[signum]) | |
3495 | { | |
3496 | sig_print_info (signum); | |
3497 | } | |
3498 | } | |
3499 | } | |
3500 | ||
3501 | do_cleanups (old_chain); | |
3502 | } | |
3503 | ||
3504 | static void | |
96baa820 | 3505 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3506 | { |
3507 | char **argv; | |
3508 | struct cleanup *old_chain; | |
3509 | ||
3510 | /* Break the command line up into args. */ | |
3511 | ||
3512 | argv = buildargv (args); | |
3513 | if (argv == NULL) | |
3514 | { | |
3515 | nomem (0); | |
3516 | } | |
7a292a7a | 3517 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3518 | if (argv[1] != (char *) NULL) |
3519 | { | |
3520 | char *argBuf; | |
3521 | int bufLen; | |
3522 | ||
3523 | bufLen = strlen (argv[0]) + 20; | |
3524 | argBuf = (char *) xmalloc (bufLen); | |
3525 | if (argBuf) | |
3526 | { | |
3527 | int validFlag = 1; | |
3528 | enum target_signal oursig; | |
3529 | ||
3530 | oursig = target_signal_from_name (argv[0]); | |
3531 | memset (argBuf, 0, bufLen); | |
3532 | if (strcmp (argv[1], "Q") == 0) | |
3533 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3534 | else | |
3535 | { | |
3536 | if (strcmp (argv[1], "s") == 0) | |
3537 | { | |
3538 | if (!signal_stop[oursig]) | |
3539 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3540 | else | |
3541 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3542 | } | |
3543 | else if (strcmp (argv[1], "i") == 0) | |
3544 | { | |
3545 | if (!signal_program[oursig]) | |
3546 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3547 | else | |
3548 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3549 | } | |
3550 | else if (strcmp (argv[1], "r") == 0) | |
3551 | { | |
3552 | if (!signal_print[oursig]) | |
3553 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3554 | else | |
3555 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3556 | } | |
3557 | else | |
3558 | validFlag = 0; | |
3559 | } | |
3560 | if (validFlag) | |
3561 | handle_command (argBuf, from_tty); | |
3562 | else | |
a3f17187 | 3563 | printf_filtered (_("Invalid signal handling flag.\n")); |
c906108c | 3564 | if (argBuf) |
b8c9b27d | 3565 | xfree (argBuf); |
c906108c SS |
3566 | } |
3567 | } | |
3568 | do_cleanups (old_chain); | |
3569 | } | |
3570 | ||
3571 | /* Print current contents of the tables set by the handle command. | |
3572 | It is possible we should just be printing signals actually used | |
3573 | by the current target (but for things to work right when switching | |
3574 | targets, all signals should be in the signal tables). */ | |
3575 | ||
3576 | static void | |
96baa820 | 3577 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3578 | { |
3579 | enum target_signal oursig; | |
3580 | sig_print_header (); | |
3581 | ||
3582 | if (signum_exp) | |
3583 | { | |
3584 | /* First see if this is a symbol name. */ | |
3585 | oursig = target_signal_from_name (signum_exp); | |
3586 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3587 | { | |
3588 | /* No, try numeric. */ | |
3589 | oursig = | |
bb518678 | 3590 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3591 | } |
3592 | sig_print_info (oursig); | |
3593 | return; | |
3594 | } | |
3595 | ||
3596 | printf_filtered ("\n"); | |
3597 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3598 | for (oursig = TARGET_SIGNAL_FIRST; | |
3599 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3600 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3601 | { | |
3602 | QUIT; | |
3603 | ||
3604 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 3605 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
3606 | sig_print_info (oursig); |
3607 | } | |
3608 | ||
a3f17187 | 3609 | printf_filtered (_("\nUse the \"handle\" command to change these tables.\n")); |
c906108c SS |
3610 | } |
3611 | \f | |
7a292a7a SS |
3612 | struct inferior_status |
3613 | { | |
3614 | enum target_signal stop_signal; | |
3615 | CORE_ADDR stop_pc; | |
3616 | bpstat stop_bpstat; | |
3617 | int stop_step; | |
3618 | int stop_stack_dummy; | |
3619 | int stopped_by_random_signal; | |
3620 | int trap_expected; | |
3621 | CORE_ADDR step_range_start; | |
3622 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 3623 | struct frame_id step_frame_id; |
5fbbeb29 | 3624 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3625 | CORE_ADDR step_resume_break_address; |
3626 | int stop_after_trap; | |
c0236d92 | 3627 | int stop_soon; |
72cec141 | 3628 | struct regcache *stop_registers; |
7a292a7a SS |
3629 | |
3630 | /* These are here because if call_function_by_hand has written some | |
3631 | registers and then decides to call error(), we better not have changed | |
3632 | any registers. */ | |
72cec141 | 3633 | struct regcache *registers; |
7a292a7a | 3634 | |
101dcfbe AC |
3635 | /* A frame unique identifier. */ |
3636 | struct frame_id selected_frame_id; | |
3637 | ||
7a292a7a SS |
3638 | int breakpoint_proceeded; |
3639 | int restore_stack_info; | |
3640 | int proceed_to_finish; | |
3641 | }; | |
3642 | ||
7a292a7a | 3643 | void |
96baa820 JM |
3644 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3645 | LONGEST val) | |
7a292a7a | 3646 | { |
3acba339 | 3647 | int size = register_size (current_gdbarch, regno); |
7a292a7a SS |
3648 | void *buf = alloca (size); |
3649 | store_signed_integer (buf, size, val); | |
0818c12a | 3650 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
3651 | } |
3652 | ||
c906108c SS |
3653 | /* Save all of the information associated with the inferior<==>gdb |
3654 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3655 | (defined in inferior.h). */ | |
3656 | ||
7a292a7a | 3657 | struct inferior_status * |
96baa820 | 3658 | save_inferior_status (int restore_stack_info) |
c906108c | 3659 | { |
72cec141 | 3660 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 3661 | |
c906108c SS |
3662 | inf_status->stop_signal = stop_signal; |
3663 | inf_status->stop_pc = stop_pc; | |
3664 | inf_status->stop_step = stop_step; | |
3665 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3666 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3667 | inf_status->trap_expected = trap_expected; | |
3668 | inf_status->step_range_start = step_range_start; | |
3669 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 3670 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
3671 | inf_status->step_over_calls = step_over_calls; |
3672 | inf_status->stop_after_trap = stop_after_trap; | |
c0236d92 | 3673 | inf_status->stop_soon = stop_soon; |
c906108c SS |
3674 | /* Save original bpstat chain here; replace it with copy of chain. |
3675 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3676 | hand them back the original chain when restore_inferior_status is |
3677 | called. */ | |
c906108c SS |
3678 | inf_status->stop_bpstat = stop_bpstat; |
3679 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3680 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3681 | inf_status->restore_stack_info = restore_stack_info; | |
3682 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3683 | |
72cec141 | 3684 | inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers); |
c906108c | 3685 | |
72cec141 | 3686 | inf_status->registers = regcache_dup (current_regcache); |
c906108c | 3687 | |
206415a3 | 3688 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
7a292a7a | 3689 | return inf_status; |
c906108c SS |
3690 | } |
3691 | ||
c906108c | 3692 | static int |
96baa820 | 3693 | restore_selected_frame (void *args) |
c906108c | 3694 | { |
488f131b | 3695 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 3696 | struct frame_info *frame; |
c906108c | 3697 | |
101dcfbe | 3698 | frame = frame_find_by_id (*fid); |
c906108c | 3699 | |
aa0cd9c1 AC |
3700 | /* If inf_status->selected_frame_id is NULL, there was no previously |
3701 | selected frame. */ | |
101dcfbe | 3702 | if (frame == NULL) |
c906108c | 3703 | { |
8a3fe4f8 | 3704 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
3705 | return 0; |
3706 | } | |
3707 | ||
0f7d239c | 3708 | select_frame (frame); |
c906108c SS |
3709 | |
3710 | return (1); | |
3711 | } | |
3712 | ||
3713 | void | |
96baa820 | 3714 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3715 | { |
3716 | stop_signal = inf_status->stop_signal; | |
3717 | stop_pc = inf_status->stop_pc; | |
3718 | stop_step = inf_status->stop_step; | |
3719 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3720 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3721 | trap_expected = inf_status->trap_expected; | |
3722 | step_range_start = inf_status->step_range_start; | |
3723 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 3724 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
3725 | step_over_calls = inf_status->step_over_calls; |
3726 | stop_after_trap = inf_status->stop_after_trap; | |
c0236d92 | 3727 | stop_soon = inf_status->stop_soon; |
c906108c SS |
3728 | bpstat_clear (&stop_bpstat); |
3729 | stop_bpstat = inf_status->stop_bpstat; | |
3730 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3731 | proceed_to_finish = inf_status->proceed_to_finish; | |
3732 | ||
72cec141 AC |
3733 | /* FIXME: Is the restore of stop_registers always needed. */ |
3734 | regcache_xfree (stop_registers); | |
3735 | stop_registers = inf_status->stop_registers; | |
c906108c SS |
3736 | |
3737 | /* The inferior can be gone if the user types "print exit(0)" | |
3738 | (and perhaps other times). */ | |
3739 | if (target_has_execution) | |
72cec141 AC |
3740 | /* NB: The register write goes through to the target. */ |
3741 | regcache_cpy (current_regcache, inf_status->registers); | |
3742 | regcache_xfree (inf_status->registers); | |
c906108c | 3743 | |
c906108c SS |
3744 | /* FIXME: If we are being called after stopping in a function which |
3745 | is called from gdb, we should not be trying to restore the | |
3746 | selected frame; it just prints a spurious error message (The | |
3747 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3748 | clobbers the stack)). In fact, should we be restoring the | |
3749 | inferior status at all in that case? . */ | |
3750 | ||
3751 | if (target_has_stack && inf_status->restore_stack_info) | |
3752 | { | |
c906108c | 3753 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
3754 | walking the stack might encounter a garbage pointer and |
3755 | error() trying to dereference it. */ | |
488f131b JB |
3756 | if (catch_errors |
3757 | (restore_selected_frame, &inf_status->selected_frame_id, | |
3758 | "Unable to restore previously selected frame:\n", | |
3759 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
3760 | /* Error in restoring the selected frame. Select the innermost |
3761 | frame. */ | |
0f7d239c | 3762 | select_frame (get_current_frame ()); |
c906108c SS |
3763 | |
3764 | } | |
c906108c | 3765 | |
72cec141 | 3766 | xfree (inf_status); |
7a292a7a | 3767 | } |
c906108c | 3768 | |
74b7792f AC |
3769 | static void |
3770 | do_restore_inferior_status_cleanup (void *sts) | |
3771 | { | |
3772 | restore_inferior_status (sts); | |
3773 | } | |
3774 | ||
3775 | struct cleanup * | |
3776 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
3777 | { | |
3778 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
3779 | } | |
3780 | ||
c906108c | 3781 | void |
96baa820 | 3782 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3783 | { |
3784 | /* See save_inferior_status for info on stop_bpstat. */ | |
3785 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 AC |
3786 | regcache_xfree (inf_status->registers); |
3787 | regcache_xfree (inf_status->stop_registers); | |
3788 | xfree (inf_status); | |
7a292a7a SS |
3789 | } |
3790 | ||
47932f85 DJ |
3791 | int |
3792 | inferior_has_forked (int pid, int *child_pid) | |
3793 | { | |
3794 | struct target_waitstatus last; | |
3795 | ptid_t last_ptid; | |
3796 | ||
3797 | get_last_target_status (&last_ptid, &last); | |
3798 | ||
3799 | if (last.kind != TARGET_WAITKIND_FORKED) | |
3800 | return 0; | |
3801 | ||
3802 | if (ptid_get_pid (last_ptid) != pid) | |
3803 | return 0; | |
3804 | ||
3805 | *child_pid = last.value.related_pid; | |
3806 | return 1; | |
3807 | } | |
3808 | ||
3809 | int | |
3810 | inferior_has_vforked (int pid, int *child_pid) | |
3811 | { | |
3812 | struct target_waitstatus last; | |
3813 | ptid_t last_ptid; | |
3814 | ||
3815 | get_last_target_status (&last_ptid, &last); | |
3816 | ||
3817 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
3818 | return 0; | |
3819 | ||
3820 | if (ptid_get_pid (last_ptid) != pid) | |
3821 | return 0; | |
3822 | ||
3823 | *child_pid = last.value.related_pid; | |
3824 | return 1; | |
3825 | } | |
3826 | ||
3827 | int | |
3828 | inferior_has_execd (int pid, char **execd_pathname) | |
3829 | { | |
3830 | struct target_waitstatus last; | |
3831 | ptid_t last_ptid; | |
3832 | ||
3833 | get_last_target_status (&last_ptid, &last); | |
3834 | ||
3835 | if (last.kind != TARGET_WAITKIND_EXECD) | |
3836 | return 0; | |
3837 | ||
3838 | if (ptid_get_pid (last_ptid) != pid) | |
3839 | return 0; | |
3840 | ||
3841 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
3842 | return 1; | |
3843 | } | |
3844 | ||
ca6724c1 KB |
3845 | /* Oft used ptids */ |
3846 | ptid_t null_ptid; | |
3847 | ptid_t minus_one_ptid; | |
3848 | ||
3849 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 3850 | |
ca6724c1 KB |
3851 | ptid_t |
3852 | ptid_build (int pid, long lwp, long tid) | |
3853 | { | |
3854 | ptid_t ptid; | |
3855 | ||
3856 | ptid.pid = pid; | |
3857 | ptid.lwp = lwp; | |
3858 | ptid.tid = tid; | |
3859 | return ptid; | |
3860 | } | |
3861 | ||
3862 | /* Create a ptid from just a pid. */ | |
3863 | ||
3864 | ptid_t | |
3865 | pid_to_ptid (int pid) | |
3866 | { | |
3867 | return ptid_build (pid, 0, 0); | |
3868 | } | |
3869 | ||
3870 | /* Fetch the pid (process id) component from a ptid. */ | |
3871 | ||
3872 | int | |
3873 | ptid_get_pid (ptid_t ptid) | |
3874 | { | |
3875 | return ptid.pid; | |
3876 | } | |
3877 | ||
3878 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
3879 | ||
3880 | long | |
3881 | ptid_get_lwp (ptid_t ptid) | |
3882 | { | |
3883 | return ptid.lwp; | |
3884 | } | |
3885 | ||
3886 | /* Fetch the tid (thread id) component from a ptid. */ | |
3887 | ||
3888 | long | |
3889 | ptid_get_tid (ptid_t ptid) | |
3890 | { | |
3891 | return ptid.tid; | |
3892 | } | |
3893 | ||
3894 | /* ptid_equal() is used to test equality of two ptids. */ | |
3895 | ||
3896 | int | |
3897 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
3898 | { | |
3899 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 3900 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
3901 | } |
3902 | ||
3903 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
3904 | to restore the inferior_ptid value saved in a call to | |
3905 | save_inferior_ptid(). */ | |
ce696e05 KB |
3906 | |
3907 | static void | |
3908 | restore_inferior_ptid (void *arg) | |
3909 | { | |
3910 | ptid_t *saved_ptid_ptr = arg; | |
3911 | inferior_ptid = *saved_ptid_ptr; | |
3912 | xfree (arg); | |
3913 | } | |
3914 | ||
3915 | /* Save the value of inferior_ptid so that it may be restored by a | |
3916 | later call to do_cleanups(). Returns the struct cleanup pointer | |
3917 | needed for later doing the cleanup. */ | |
3918 | ||
3919 | struct cleanup * | |
3920 | save_inferior_ptid (void) | |
3921 | { | |
3922 | ptid_t *saved_ptid_ptr; | |
3923 | ||
3924 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
3925 | *saved_ptid_ptr = inferior_ptid; | |
3926 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
3927 | } | |
c5aa993b | 3928 | \f |
488f131b | 3929 | |
7a292a7a | 3930 | static void |
96baa820 | 3931 | build_infrun (void) |
7a292a7a | 3932 | { |
72cec141 | 3933 | stop_registers = regcache_xmalloc (current_gdbarch); |
7a292a7a | 3934 | } |
c906108c | 3935 | |
c906108c | 3936 | void |
96baa820 | 3937 | _initialize_infrun (void) |
c906108c | 3938 | { |
52f0bd74 AC |
3939 | int i; |
3940 | int numsigs; | |
c906108c SS |
3941 | struct cmd_list_element *c; |
3942 | ||
046a4708 AC |
3943 | DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers); |
3944 | deprecated_register_gdbarch_swap (NULL, 0, build_infrun); | |
0f71a2f6 | 3945 | |
1bedd215 AC |
3946 | add_info ("signals", signals_info, _("\ |
3947 | What debugger does when program gets various signals.\n\ | |
3948 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
3949 | add_info_alias ("handle", "signals", 0); |
3950 | ||
1bedd215 AC |
3951 | add_com ("handle", class_run, handle_command, _("\ |
3952 | Specify how to handle a signal.\n\ | |
c906108c SS |
3953 | Args are signals and actions to apply to those signals.\n\ |
3954 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3955 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3956 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3957 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
3958 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
3959 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
c906108c SS |
3960 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
3961 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3962 | Print means print a message if this signal happens.\n\ | |
3963 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3964 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 3965 | Pass and Stop may be combined.")); |
c906108c SS |
3966 | if (xdb_commands) |
3967 | { | |
1bedd215 AC |
3968 | add_com ("lz", class_info, signals_info, _("\ |
3969 | What debugger does when program gets various signals.\n\ | |
3970 | Specify a signal as argument to print info on that signal only.")); | |
3971 | add_com ("z", class_run, xdb_handle_command, _("\ | |
3972 | Specify how to handle a signal.\n\ | |
c906108c SS |
3973 | Args are signals and actions to apply to those signals.\n\ |
3974 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3975 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3976 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3977 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
3978 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
3979 | Recognized actions include \"s\" (toggles between stop and nostop), \n\ | |
c906108c SS |
3980 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
3981 | nopass), \"Q\" (noprint)\n\ | |
3982 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3983 | Print means print a message if this signal happens.\n\ | |
3984 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3985 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 3986 | Pass and Stop may be combined.")); |
c906108c SS |
3987 | } |
3988 | ||
3989 | if (!dbx_commands) | |
1a966eab AC |
3990 | stop_command = add_cmd ("stop", class_obscure, |
3991 | not_just_help_class_command, _("\ | |
3992 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 3993 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 3994 | of the program stops."), &cmdlist); |
c906108c | 3995 | |
85c07804 AC |
3996 | add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
3997 | Set inferior debugging."), _("\ | |
3998 | Show inferior debugging."), _("\ | |
3999 | When non-zero, inferior specific debugging is enabled."), | |
4000 | NULL, | |
920d2a44 | 4001 | show_debug_infrun, |
85c07804 | 4002 | &setdebuglist, &showdebuglist); |
527159b7 | 4003 | |
c906108c | 4004 | numsigs = (int) TARGET_SIGNAL_LAST; |
488f131b | 4005 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
4006 | signal_print = (unsigned char *) |
4007 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
4008 | signal_program = (unsigned char *) | |
4009 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
4010 | for (i = 0; i < numsigs; i++) | |
4011 | { | |
4012 | signal_stop[i] = 1; | |
4013 | signal_print[i] = 1; | |
4014 | signal_program[i] = 1; | |
4015 | } | |
4016 | ||
4017 | /* Signals caused by debugger's own actions | |
4018 | should not be given to the program afterwards. */ | |
4019 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
4020 | signal_program[TARGET_SIGNAL_INT] = 0; | |
4021 | ||
4022 | /* Signals that are not errors should not normally enter the debugger. */ | |
4023 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
4024 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
4025 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
4026 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
4027 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
4028 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
4029 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
4030 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
4031 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
4032 | signal_print[TARGET_SIGNAL_IO] = 0; | |
4033 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
4034 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
4035 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
4036 | signal_print[TARGET_SIGNAL_URG] = 0; | |
4037 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
4038 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
4039 | ||
cd0fc7c3 SS |
4040 | /* These signals are used internally by user-level thread |
4041 | implementations. (See signal(5) on Solaris.) Like the above | |
4042 | signals, a healthy program receives and handles them as part of | |
4043 | its normal operation. */ | |
4044 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
4045 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
4046 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
4047 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
4048 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
4049 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
4050 | ||
85c07804 AC |
4051 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
4052 | &stop_on_solib_events, _("\ | |
4053 | Set stopping for shared library events."), _("\ | |
4054 | Show stopping for shared library events."), _("\ | |
c906108c SS |
4055 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
4056 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 AC |
4057 | to the user would be loading/unloading of a new library."), |
4058 | NULL, | |
920d2a44 | 4059 | show_stop_on_solib_events, |
85c07804 | 4060 | &setlist, &showlist); |
c906108c | 4061 | |
7ab04401 AC |
4062 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
4063 | follow_fork_mode_kind_names, | |
4064 | &follow_fork_mode_string, _("\ | |
4065 | Set debugger response to a program call of fork or vfork."), _("\ | |
4066 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
4067 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
4068 | parent - the original process is debugged after a fork\n\ | |
4069 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 4070 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
4071 | By default, the debugger will follow the parent process."), |
4072 | NULL, | |
920d2a44 | 4073 | show_follow_fork_mode_string, |
7ab04401 AC |
4074 | &setlist, &showlist); |
4075 | ||
4076 | add_setshow_enum_cmd ("scheduler-locking", class_run, | |
4077 | scheduler_enums, &scheduler_mode, _("\ | |
4078 | Set mode for locking scheduler during execution."), _("\ | |
4079 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
4080 | off == no locking (threads may preempt at any time)\n\ |
4081 | on == full locking (no thread except the current thread may run)\n\ | |
4082 | step == scheduler locked during every single-step operation.\n\ | |
4083 | In this mode, no other thread may run during a step command.\n\ | |
7ab04401 AC |
4084 | Other threads may run while stepping over a function call ('next')."), |
4085 | set_schedlock_func, /* traps on target vector */ | |
920d2a44 | 4086 | show_scheduler_mode, |
7ab04401 | 4087 | &setlist, &showlist); |
5fbbeb29 | 4088 | |
5bf193a2 AC |
4089 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
4090 | Set mode of the step operation."), _("\ | |
4091 | Show mode of the step operation."), _("\ | |
4092 | When set, doing a step over a function without debug line information\n\ | |
4093 | will stop at the first instruction of that function. Otherwise, the\n\ | |
4094 | function is skipped and the step command stops at a different source line."), | |
4095 | NULL, | |
920d2a44 | 4096 | show_step_stop_if_no_debug, |
5bf193a2 | 4097 | &setlist, &showlist); |
ca6724c1 KB |
4098 | |
4099 | /* ptid initializations */ | |
4100 | null_ptid = ptid_build (0, 0, 0); | |
4101 | minus_one_ptid = ptid_build (-1, 0, 0); | |
4102 | inferior_ptid = null_ptid; | |
4103 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 4104 | } |