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 SS |
290 | |
291 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
292 | ||
293 | static int breakpoints_failed; | |
294 | ||
295 | /* Nonzero after stop if current stack frame should be printed. */ | |
296 | ||
297 | static int stop_print_frame; | |
298 | ||
299 | static struct breakpoint *step_resume_breakpoint = NULL; | |
c906108c | 300 | |
e02bc4cc | 301 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
302 | returned by target_wait()/deprecated_target_wait_hook(). This |
303 | information is returned by get_last_target_status(). */ | |
39f77062 | 304 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
305 | static struct target_waitstatus target_last_waitstatus; |
306 | ||
c906108c SS |
307 | /* This is used to remember when a fork, vfork or exec event |
308 | was caught by a catchpoint, and thus the event is to be | |
309 | followed at the next resume of the inferior, and not | |
310 | immediately. */ | |
311 | static struct | |
488f131b JB |
312 | { |
313 | enum target_waitkind kind; | |
314 | struct | |
c906108c | 315 | { |
488f131b | 316 | int parent_pid; |
488f131b | 317 | int child_pid; |
c906108c | 318 | } |
488f131b JB |
319 | fork_event; |
320 | char *execd_pathname; | |
321 | } | |
c906108c SS |
322 | pending_follow; |
323 | ||
53904c9e AC |
324 | static const char follow_fork_mode_child[] = "child"; |
325 | static const char follow_fork_mode_parent[] = "parent"; | |
326 | ||
488f131b | 327 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e AC |
328 | follow_fork_mode_child, |
329 | follow_fork_mode_parent, | |
330 | NULL | |
ef346e04 | 331 | }; |
c906108c | 332 | |
53904c9e | 333 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
334 | static void |
335 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
336 | struct cmd_list_element *c, const char *value) | |
337 | { | |
338 | fprintf_filtered (file, _("\ | |
339 | Debugger response to a program call of fork or vfork is \"%s\".\n"), | |
340 | value); | |
341 | } | |
c906108c SS |
342 | \f |
343 | ||
6604731b | 344 | static int |
4ef3f3be | 345 | follow_fork (void) |
c906108c | 346 | { |
ea1dd7bc | 347 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
c906108c | 348 | |
6604731b | 349 | return target_follow_fork (follow_child); |
c906108c SS |
350 | } |
351 | ||
6604731b DJ |
352 | void |
353 | follow_inferior_reset_breakpoints (void) | |
c906108c | 354 | { |
6604731b DJ |
355 | /* Was there a step_resume breakpoint? (There was if the user |
356 | did a "next" at the fork() call.) If so, explicitly reset its | |
357 | thread number. | |
358 | ||
359 | step_resumes are a form of bp that are made to be per-thread. | |
360 | Since we created the step_resume bp when the parent process | |
361 | was being debugged, and now are switching to the child process, | |
362 | from the breakpoint package's viewpoint, that's a switch of | |
363 | "threads". We must update the bp's notion of which thread | |
364 | it is for, or it'll be ignored when it triggers. */ | |
365 | ||
366 | if (step_resume_breakpoint) | |
367 | breakpoint_re_set_thread (step_resume_breakpoint); | |
368 | ||
369 | /* Reinsert all breakpoints in the child. The user may have set | |
370 | breakpoints after catching the fork, in which case those | |
371 | were never set in the child, but only in the parent. This makes | |
372 | sure the inserted breakpoints match the breakpoint list. */ | |
373 | ||
374 | breakpoint_re_set (); | |
375 | insert_breakpoints (); | |
c906108c | 376 | } |
c906108c | 377 | |
1adeb98a FN |
378 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
379 | ||
c906108c | 380 | static void |
96baa820 | 381 | follow_exec (int pid, char *execd_pathname) |
c906108c | 382 | { |
c906108c | 383 | int saved_pid = pid; |
7a292a7a SS |
384 | struct target_ops *tgt; |
385 | ||
386 | if (!may_follow_exec) | |
387 | return; | |
c906108c | 388 | |
c906108c SS |
389 | /* This is an exec event that we actually wish to pay attention to. |
390 | Refresh our symbol table to the newly exec'd program, remove any | |
391 | momentary bp's, etc. | |
392 | ||
393 | If there are breakpoints, they aren't really inserted now, | |
394 | since the exec() transformed our inferior into a fresh set | |
395 | of instructions. | |
396 | ||
397 | We want to preserve symbolic breakpoints on the list, since | |
398 | we have hopes that they can be reset after the new a.out's | |
399 | symbol table is read. | |
400 | ||
401 | However, any "raw" breakpoints must be removed from the list | |
402 | (e.g., the solib bp's), since their address is probably invalid | |
403 | now. | |
404 | ||
405 | And, we DON'T want to call delete_breakpoints() here, since | |
406 | that may write the bp's "shadow contents" (the instruction | |
407 | value that was overwritten witha TRAP instruction). Since | |
408 | we now have a new a.out, those shadow contents aren't valid. */ | |
409 | update_breakpoints_after_exec (); | |
410 | ||
411 | /* If there was one, it's gone now. We cannot truly step-to-next | |
412 | statement through an exec(). */ | |
413 | step_resume_breakpoint = NULL; | |
414 | step_range_start = 0; | |
415 | step_range_end = 0; | |
416 | ||
c906108c | 417 | /* What is this a.out's name? */ |
a3f17187 | 418 | printf_unfiltered (_("Executing new program: %s\n"), execd_pathname); |
c906108c SS |
419 | |
420 | /* We've followed the inferior through an exec. Therefore, the | |
421 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
422 | |
423 | /* First collect the run target in effect. */ | |
424 | tgt = find_run_target (); | |
425 | /* If we can't find one, things are in a very strange state... */ | |
426 | if (tgt == NULL) | |
8a3fe4f8 | 427 | error (_("Could find run target to save before following exec")); |
7a292a7a | 428 | |
c906108c SS |
429 | gdb_flush (gdb_stdout); |
430 | target_mourn_inferior (); | |
39f77062 | 431 | inferior_ptid = pid_to_ptid (saved_pid); |
488f131b | 432 | /* Because mourn_inferior resets inferior_ptid. */ |
7a292a7a | 433 | push_target (tgt); |
c906108c SS |
434 | |
435 | /* That a.out is now the one to use. */ | |
436 | exec_file_attach (execd_pathname, 0); | |
437 | ||
438 | /* And also is where symbols can be found. */ | |
1adeb98a | 439 | symbol_file_add_main (execd_pathname, 0); |
c906108c SS |
440 | |
441 | /* Reset the shared library package. This ensures that we get | |
442 | a shlib event when the child reaches "_start", at which point | |
443 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 444 | #if defined(SOLIB_RESTART) |
c906108c | 445 | SOLIB_RESTART (); |
7a292a7a SS |
446 | #endif |
447 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
39f77062 | 448 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
a77053c2 MK |
449 | #else |
450 | solib_create_inferior_hook (); | |
7a292a7a | 451 | #endif |
c906108c SS |
452 | |
453 | /* Reinsert all breakpoints. (Those which were symbolic have | |
454 | been reset to the proper address in the new a.out, thanks | |
455 | to symbol_file_command...) */ | |
456 | insert_breakpoints (); | |
457 | ||
458 | /* The next resume of this inferior should bring it to the shlib | |
459 | startup breakpoints. (If the user had also set bp's on | |
460 | "main" from the old (parent) process, then they'll auto- | |
461 | matically get reset there in the new process.) */ | |
c906108c SS |
462 | } |
463 | ||
464 | /* Non-zero if we just simulating a single-step. This is needed | |
465 | because we cannot remove the breakpoints in the inferior process | |
466 | until after the `wait' in `wait_for_inferior'. */ | |
467 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
468 | |
469 | /* The thread we inserted single-step breakpoints for. */ | |
470 | static ptid_t singlestep_ptid; | |
471 | ||
fd48f117 DJ |
472 | /* PC when we started this single-step. */ |
473 | static CORE_ADDR singlestep_pc; | |
474 | ||
9f976b41 DJ |
475 | /* If another thread hit the singlestep breakpoint, we save the original |
476 | thread here so that we can resume single-stepping it later. */ | |
477 | static ptid_t saved_singlestep_ptid; | |
478 | static int stepping_past_singlestep_breakpoint; | |
c906108c SS |
479 | \f |
480 | ||
481 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 482 | static void |
74b7792f | 483 | resume_cleanups (void *ignore) |
c906108c SS |
484 | { |
485 | normal_stop (); | |
486 | } | |
487 | ||
53904c9e AC |
488 | static const char schedlock_off[] = "off"; |
489 | static const char schedlock_on[] = "on"; | |
490 | static const char schedlock_step[] = "step"; | |
488f131b | 491 | static const char *scheduler_enums[] = { |
ef346e04 AC |
492 | schedlock_off, |
493 | schedlock_on, | |
494 | schedlock_step, | |
495 | NULL | |
496 | }; | |
920d2a44 AC |
497 | static const char *scheduler_mode = schedlock_off; |
498 | static void | |
499 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
500 | struct cmd_list_element *c, const char *value) | |
501 | { | |
502 | fprintf_filtered (file, _("\ | |
503 | Mode for locking scheduler during execution is \"%s\".\n"), | |
504 | value); | |
505 | } | |
c906108c SS |
506 | |
507 | static void | |
96baa820 | 508 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 509 | { |
eefe576e AC |
510 | if (!target_can_lock_scheduler) |
511 | { | |
512 | scheduler_mode = schedlock_off; | |
513 | error (_("Target '%s' cannot support this command."), target_shortname); | |
514 | } | |
c906108c SS |
515 | } |
516 | ||
517 | ||
518 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
519 | wants to interrupt some lengthy single-stepping operation | |
520 | (for child processes, the SIGINT goes to the inferior, and so | |
521 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
522 | other targets, that's not true). | |
523 | ||
524 | STEP nonzero if we should step (zero to continue instead). | |
525 | SIG is the signal to give the inferior (zero for none). */ | |
526 | void | |
96baa820 | 527 | resume (int step, enum target_signal sig) |
c906108c SS |
528 | { |
529 | int should_resume = 1; | |
74b7792f | 530 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
c906108c SS |
531 | QUIT; |
532 | ||
527159b7 | 533 | if (debug_infrun) |
8a9de0e4 AC |
534 | fprintf_unfiltered (gdb_stdlog, "infrun: resume (step=%d, signal=%d)\n", |
535 | step, sig); | |
527159b7 | 536 | |
ef5cf84e MS |
537 | /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */ |
538 | ||
c906108c | 539 | |
692590c1 MS |
540 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
541 | over an instruction that causes a page fault without triggering | |
542 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
543 | stop, because the hardware watchpoint is not triggered, but it forgets | |
544 | the step request and continues the program normally. | |
545 | Work around the problem by removing hardware watchpoints if a step is | |
546 | requested, GDB will check for a hardware watchpoint trigger after the | |
547 | step anyway. */ | |
548 | if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) | |
549 | remove_hw_watchpoints (); | |
488f131b | 550 | |
692590c1 | 551 | |
c2c6d25f JM |
552 | /* Normally, by the time we reach `resume', the breakpoints are either |
553 | removed or inserted, as appropriate. The exception is if we're sitting | |
554 | at a permanent breakpoint; we need to step over it, but permanent | |
555 | breakpoints can't be removed. So we have to test for it here. */ | |
556 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
557 | SKIP_PERMANENT_BREAKPOINT (); | |
558 | ||
b0ed3589 | 559 | if (SOFTWARE_SINGLE_STEP_P () && step) |
c906108c SS |
560 | { |
561 | /* Do it the hard way, w/temp breakpoints */ | |
c5aa993b | 562 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
c906108c SS |
563 | /* ...and don't ask hardware to do it. */ |
564 | step = 0; | |
565 | /* and do not pull these breakpoints until after a `wait' in | |
566 | `wait_for_inferior' */ | |
567 | singlestep_breakpoints_inserted_p = 1; | |
9f976b41 | 568 | singlestep_ptid = inferior_ptid; |
fd48f117 | 569 | singlestep_pc = read_pc (); |
c906108c SS |
570 | } |
571 | ||
c906108c | 572 | /* If there were any forks/vforks/execs that were caught and are |
6604731b | 573 | now to be followed, then do so. */ |
c906108c SS |
574 | switch (pending_follow.kind) |
575 | { | |
6604731b DJ |
576 | case TARGET_WAITKIND_FORKED: |
577 | case TARGET_WAITKIND_VFORKED: | |
c906108c | 578 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
6604731b DJ |
579 | if (follow_fork ()) |
580 | should_resume = 0; | |
c906108c SS |
581 | break; |
582 | ||
6604731b | 583 | case TARGET_WAITKIND_EXECD: |
c906108c | 584 | /* follow_exec is called as soon as the exec event is seen. */ |
6604731b | 585 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
c906108c SS |
586 | break; |
587 | ||
588 | default: | |
589 | break; | |
590 | } | |
c906108c SS |
591 | |
592 | /* Install inferior's terminal modes. */ | |
593 | target_terminal_inferior (); | |
594 | ||
595 | if (should_resume) | |
596 | { | |
39f77062 | 597 | ptid_t resume_ptid; |
dfcd3bfb | 598 | |
488f131b | 599 | resume_ptid = RESUME_ALL; /* Default */ |
ef5cf84e | 600 | |
8fb3e588 AC |
601 | if ((step || singlestep_breakpoints_inserted_p) |
602 | && (stepping_past_singlestep_breakpoint | |
603 | || (!breakpoints_inserted && breakpoint_here_p (read_pc ())))) | |
c906108c | 604 | { |
ef5cf84e MS |
605 | /* Stepping past a breakpoint without inserting breakpoints. |
606 | Make sure only the current thread gets to step, so that | |
607 | other threads don't sneak past breakpoints while they are | |
608 | not inserted. */ | |
c906108c | 609 | |
ef5cf84e | 610 | resume_ptid = inferior_ptid; |
c906108c | 611 | } |
ef5cf84e | 612 | |
8fb3e588 AC |
613 | if ((scheduler_mode == schedlock_on) |
614 | || (scheduler_mode == schedlock_step | |
615 | && (step || singlestep_breakpoints_inserted_p))) | |
c906108c | 616 | { |
ef5cf84e | 617 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 618 | resume_ptid = inferior_ptid; |
c906108c | 619 | } |
ef5cf84e | 620 | |
c4ed33b9 AC |
621 | if (CANNOT_STEP_BREAKPOINT) |
622 | { | |
623 | /* Most targets can step a breakpoint instruction, thus | |
624 | executing it normally. But if this one cannot, just | |
625 | continue and we will hit it anyway. */ | |
626 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
627 | step = 0; | |
628 | } | |
39f77062 | 629 | target_resume (resume_ptid, step, sig); |
c906108c SS |
630 | } |
631 | ||
632 | discard_cleanups (old_cleanups); | |
633 | } | |
634 | \f | |
635 | ||
636 | /* Clear out all variables saying what to do when inferior is continued. | |
637 | First do this, then set the ones you want, then call `proceed'. */ | |
638 | ||
639 | void | |
96baa820 | 640 | clear_proceed_status (void) |
c906108c SS |
641 | { |
642 | trap_expected = 0; | |
643 | step_range_start = 0; | |
644 | step_range_end = 0; | |
aa0cd9c1 | 645 | step_frame_id = null_frame_id; |
5fbbeb29 | 646 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c | 647 | stop_after_trap = 0; |
c0236d92 | 648 | stop_soon = NO_STOP_QUIETLY; |
c906108c SS |
649 | proceed_to_finish = 0; |
650 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
651 | ||
652 | /* Discard any remaining commands or status from previous stop. */ | |
653 | bpstat_clear (&stop_bpstat); | |
654 | } | |
655 | ||
ea67f13b DJ |
656 | /* This should be suitable for any targets that support threads. */ |
657 | ||
658 | static int | |
659 | prepare_to_proceed (void) | |
660 | { | |
661 | ptid_t wait_ptid; | |
662 | struct target_waitstatus wait_status; | |
663 | ||
664 | /* Get the last target status returned by target_wait(). */ | |
665 | get_last_target_status (&wait_ptid, &wait_status); | |
666 | ||
667 | /* Make sure we were stopped either at a breakpoint, or because | |
668 | of a Ctrl-C. */ | |
669 | if (wait_status.kind != TARGET_WAITKIND_STOPPED | |
8fb3e588 AC |
670 | || (wait_status.value.sig != TARGET_SIGNAL_TRAP |
671 | && wait_status.value.sig != TARGET_SIGNAL_INT)) | |
ea67f13b DJ |
672 | { |
673 | return 0; | |
674 | } | |
675 | ||
676 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
677 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
678 | { | |
679 | /* Switched over from WAIT_PID. */ | |
680 | CORE_ADDR wait_pc = read_pc_pid (wait_ptid); | |
681 | ||
682 | if (wait_pc != read_pc ()) | |
683 | { | |
684 | /* Switch back to WAIT_PID thread. */ | |
685 | inferior_ptid = wait_ptid; | |
686 | ||
687 | /* FIXME: This stuff came from switch_to_thread() in | |
688 | thread.c (which should probably be a public function). */ | |
35f196d9 | 689 | reinit_frame_cache (); |
ea67f13b DJ |
690 | registers_changed (); |
691 | stop_pc = wait_pc; | |
ea67f13b DJ |
692 | } |
693 | ||
8fb3e588 AC |
694 | /* We return 1 to indicate that there is a breakpoint here, |
695 | so we need to step over it before continuing to avoid | |
696 | hitting it straight away. */ | |
697 | if (breakpoint_here_p (wait_pc)) | |
698 | return 1; | |
ea67f13b DJ |
699 | } |
700 | ||
701 | return 0; | |
8fb3e588 | 702 | |
ea67f13b | 703 | } |
e4846b08 JJ |
704 | |
705 | /* Record the pc of the program the last time it stopped. This is | |
706 | just used internally by wait_for_inferior, but need to be preserved | |
707 | over calls to it and cleared when the inferior is started. */ | |
708 | static CORE_ADDR prev_pc; | |
709 | ||
c906108c SS |
710 | /* Basic routine for continuing the program in various fashions. |
711 | ||
712 | ADDR is the address to resume at, or -1 for resume where stopped. | |
713 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 714 | or -1 for act according to how it stopped. |
c906108c | 715 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
716 | -1 means return after that and print nothing. |
717 | You should probably set various step_... variables | |
718 | before calling here, if you are stepping. | |
c906108c SS |
719 | |
720 | You should call clear_proceed_status before calling proceed. */ | |
721 | ||
722 | void | |
96baa820 | 723 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
724 | { |
725 | int oneproc = 0; | |
726 | ||
727 | if (step > 0) | |
728 | step_start_function = find_pc_function (read_pc ()); | |
729 | if (step < 0) | |
730 | stop_after_trap = 1; | |
731 | ||
2acceee2 | 732 | if (addr == (CORE_ADDR) -1) |
c906108c | 733 | { |
c906108c | 734 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) |
3352ef37 AC |
735 | /* There is a breakpoint at the address we will resume at, |
736 | step one instruction before inserting breakpoints so that | |
737 | we do not stop right away (and report a second hit at this | |
738 | breakpoint). */ | |
c906108c | 739 | oneproc = 1; |
3352ef37 AC |
740 | else if (gdbarch_single_step_through_delay_p (current_gdbarch) |
741 | && gdbarch_single_step_through_delay (current_gdbarch, | |
742 | get_current_frame ())) | |
743 | /* We stepped onto an instruction that needs to be stepped | |
744 | again before re-inserting the breakpoint, do so. */ | |
c906108c SS |
745 | oneproc = 1; |
746 | } | |
747 | else | |
748 | { | |
749 | write_pc (addr); | |
c906108c SS |
750 | } |
751 | ||
527159b7 | 752 | if (debug_infrun) |
8a9de0e4 AC |
753 | fprintf_unfiltered (gdb_stdlog, |
754 | "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n", | |
755 | paddr_nz (addr), siggnal, step); | |
527159b7 | 756 | |
c906108c SS |
757 | /* In a multi-threaded task we may select another thread |
758 | and then continue or step. | |
759 | ||
760 | But if the old thread was stopped at a breakpoint, it | |
761 | will immediately cause another breakpoint stop without | |
762 | any execution (i.e. it will report a breakpoint hit | |
763 | incorrectly). So we must step over it first. | |
764 | ||
ea67f13b | 765 | prepare_to_proceed checks the current thread against the thread |
c906108c SS |
766 | that reported the most recent event. If a step-over is required |
767 | it returns TRUE and sets the current thread to the old thread. */ | |
ea67f13b DJ |
768 | if (prepare_to_proceed () && breakpoint_here_p (read_pc ())) |
769 | oneproc = 1; | |
c906108c | 770 | |
c906108c SS |
771 | if (oneproc) |
772 | /* We will get a trace trap after one instruction. | |
773 | Continue it automatically and insert breakpoints then. */ | |
774 | trap_expected = 1; | |
775 | else | |
776 | { | |
81d0cc19 GS |
777 | insert_breakpoints (); |
778 | /* If we get here there was no call to error() in | |
8fb3e588 | 779 | insert breakpoints -- so they were inserted. */ |
c906108c SS |
780 | breakpoints_inserted = 1; |
781 | } | |
782 | ||
783 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
784 | stop_signal = siggnal; | |
785 | /* If this signal should not be seen by program, | |
786 | give it zero. Used for debugging signals. */ | |
787 | else if (!signal_program[stop_signal]) | |
788 | stop_signal = TARGET_SIGNAL_0; | |
789 | ||
790 | annotate_starting (); | |
791 | ||
792 | /* Make sure that output from GDB appears before output from the | |
793 | inferior. */ | |
794 | gdb_flush (gdb_stdout); | |
795 | ||
e4846b08 JJ |
796 | /* Refresh prev_pc value just prior to resuming. This used to be |
797 | done in stop_stepping, however, setting prev_pc there did not handle | |
798 | scenarios such as inferior function calls or returning from | |
799 | a function via the return command. In those cases, the prev_pc | |
800 | value was not set properly for subsequent commands. The prev_pc value | |
801 | is used to initialize the starting line number in the ecs. With an | |
802 | invalid value, the gdb next command ends up stopping at the position | |
803 | represented by the next line table entry past our start position. | |
804 | On platforms that generate one line table entry per line, this | |
805 | is not a problem. However, on the ia64, the compiler generates | |
806 | extraneous line table entries that do not increase the line number. | |
807 | When we issue the gdb next command on the ia64 after an inferior call | |
808 | or a return command, we often end up a few instructions forward, still | |
809 | within the original line we started. | |
810 | ||
811 | An attempt was made to have init_execution_control_state () refresh | |
812 | the prev_pc value before calculating the line number. This approach | |
813 | did not work because on platforms that use ptrace, the pc register | |
814 | cannot be read unless the inferior is stopped. At that point, we | |
815 | are not guaranteed the inferior is stopped and so the read_pc () | |
816 | call can fail. Setting the prev_pc value here ensures the value is | |
8fb3e588 | 817 | updated correctly when the inferior is stopped. */ |
e4846b08 JJ |
818 | prev_pc = read_pc (); |
819 | ||
c906108c SS |
820 | /* Resume inferior. */ |
821 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
822 | ||
823 | /* Wait for it to stop (if not standalone) | |
824 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
825 | /* Do this only if we are not using the event loop, or if the target |
826 | does not support asynchronous execution. */ | |
362646f5 | 827 | if (!target_can_async_p ()) |
43ff13b4 JM |
828 | { |
829 | wait_for_inferior (); | |
830 | normal_stop (); | |
831 | } | |
c906108c | 832 | } |
c906108c SS |
833 | \f |
834 | ||
835 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 836 | |
c906108c | 837 | void |
8621d6a9 | 838 | start_remote (int from_tty) |
c906108c SS |
839 | { |
840 | init_thread_list (); | |
841 | init_wait_for_inferior (); | |
c0236d92 | 842 | stop_soon = STOP_QUIETLY; |
c906108c | 843 | trap_expected = 0; |
43ff13b4 | 844 | |
6426a772 JM |
845 | /* Always go on waiting for the target, regardless of the mode. */ |
846 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 847 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
848 | nothing is returned (instead of just blocking). Because of this, |
849 | targets expecting an immediate response need to, internally, set | |
850 | things up so that the target_wait() is forced to eventually | |
851 | timeout. */ | |
852 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
853 | differentiate to its caller what the state of the target is after | |
854 | the initial open has been performed. Here we're assuming that | |
855 | the target has stopped. It should be possible to eventually have | |
856 | target_open() return to the caller an indication that the target | |
857 | is currently running and GDB state should be set to the same as | |
858 | for an async run. */ | |
859 | wait_for_inferior (); | |
8621d6a9 DJ |
860 | |
861 | /* Now that the inferior has stopped, do any bookkeeping like | |
862 | loading shared libraries. We want to do this before normal_stop, | |
863 | so that the displayed frame is up to date. */ | |
864 | post_create_inferior (¤t_target, from_tty); | |
865 | ||
6426a772 | 866 | normal_stop (); |
c906108c SS |
867 | } |
868 | ||
869 | /* Initialize static vars when a new inferior begins. */ | |
870 | ||
871 | void | |
96baa820 | 872 | init_wait_for_inferior (void) |
c906108c SS |
873 | { |
874 | /* These are meaningless until the first time through wait_for_inferior. */ | |
875 | prev_pc = 0; | |
c906108c | 876 | |
c906108c SS |
877 | breakpoints_inserted = 0; |
878 | breakpoint_init_inferior (inf_starting); | |
879 | ||
880 | /* Don't confuse first call to proceed(). */ | |
881 | stop_signal = TARGET_SIGNAL_0; | |
882 | ||
883 | /* The first resume is not following a fork/vfork/exec. */ | |
884 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
c906108c | 885 | |
c906108c | 886 | clear_proceed_status (); |
9f976b41 DJ |
887 | |
888 | stepping_past_singlestep_breakpoint = 0; | |
c906108c | 889 | } |
c906108c | 890 | \f |
b83266a0 SS |
891 | /* This enum encodes possible reasons for doing a target_wait, so that |
892 | wfi can call target_wait in one place. (Ultimately the call will be | |
893 | moved out of the infinite loop entirely.) */ | |
894 | ||
c5aa993b JM |
895 | enum infwait_states |
896 | { | |
cd0fc7c3 SS |
897 | infwait_normal_state, |
898 | infwait_thread_hop_state, | |
cd0fc7c3 | 899 | infwait_nonstep_watch_state |
b83266a0 SS |
900 | }; |
901 | ||
11cf8741 JM |
902 | /* Why did the inferior stop? Used to print the appropriate messages |
903 | to the interface from within handle_inferior_event(). */ | |
904 | enum inferior_stop_reason | |
905 | { | |
11cf8741 JM |
906 | /* Step, next, nexti, stepi finished. */ |
907 | END_STEPPING_RANGE, | |
11cf8741 JM |
908 | /* Inferior terminated by signal. */ |
909 | SIGNAL_EXITED, | |
910 | /* Inferior exited. */ | |
911 | EXITED, | |
912 | /* Inferior received signal, and user asked to be notified. */ | |
913 | SIGNAL_RECEIVED | |
914 | }; | |
915 | ||
cd0fc7c3 SS |
916 | /* This structure contains what used to be local variables in |
917 | wait_for_inferior. Probably many of them can return to being | |
918 | locals in handle_inferior_event. */ | |
919 | ||
c5aa993b | 920 | struct execution_control_state |
488f131b JB |
921 | { |
922 | struct target_waitstatus ws; | |
923 | struct target_waitstatus *wp; | |
924 | int another_trap; | |
925 | int random_signal; | |
926 | CORE_ADDR stop_func_start; | |
927 | CORE_ADDR stop_func_end; | |
928 | char *stop_func_name; | |
929 | struct symtab_and_line sal; | |
488f131b JB |
930 | int current_line; |
931 | struct symtab *current_symtab; | |
932 | int handling_longjmp; /* FIXME */ | |
933 | ptid_t ptid; | |
934 | ptid_t saved_inferior_ptid; | |
68f53502 | 935 | int step_after_step_resume_breakpoint; |
488f131b JB |
936 | int stepping_through_solib_after_catch; |
937 | bpstat stepping_through_solib_catchpoints; | |
488f131b JB |
938 | int new_thread_event; |
939 | struct target_waitstatus tmpstatus; | |
940 | enum infwait_states infwait_state; | |
941 | ptid_t waiton_ptid; | |
942 | int wait_some_more; | |
943 | }; | |
944 | ||
945 | void init_execution_control_state (struct execution_control_state *ecs); | |
946 | ||
947 | void handle_inferior_event (struct execution_control_state *ecs); | |
cd0fc7c3 | 948 | |
c2c6d25f | 949 | static void step_into_function (struct execution_control_state *ecs); |
44cbf7b5 | 950 | static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame); |
14e60db5 | 951 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); |
44cbf7b5 AC |
952 | static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, |
953 | struct frame_id sr_id); | |
104c1213 JM |
954 | static void stop_stepping (struct execution_control_state *ecs); |
955 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 956 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
957 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
958 | int stop_info); | |
104c1213 | 959 | |
cd0fc7c3 SS |
960 | /* Wait for control to return from inferior to debugger. |
961 | If inferior gets a signal, we may decide to start it up again | |
962 | instead of returning. That is why there is a loop in this function. | |
963 | When this function actually returns it means the inferior | |
964 | should be left stopped and GDB should read more commands. */ | |
965 | ||
966 | void | |
96baa820 | 967 | wait_for_inferior (void) |
cd0fc7c3 SS |
968 | { |
969 | struct cleanup *old_cleanups; | |
970 | struct execution_control_state ecss; | |
971 | struct execution_control_state *ecs; | |
c906108c | 972 | |
527159b7 | 973 | if (debug_infrun) |
8a9de0e4 | 974 | fprintf_unfiltered (gdb_stdlog, "infrun: wait_for_inferior\n"); |
527159b7 | 975 | |
8601f500 | 976 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c | 977 | &step_resume_breakpoint); |
cd0fc7c3 SS |
978 | |
979 | /* wfi still stays in a loop, so it's OK just to take the address of | |
980 | a local to get the ecs pointer. */ | |
981 | ecs = &ecss; | |
982 | ||
983 | /* Fill in with reasonable starting values. */ | |
984 | init_execution_control_state (ecs); | |
985 | ||
c906108c | 986 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 987 | previous_inferior_ptid = inferior_ptid; |
c906108c | 988 | |
cd0fc7c3 SS |
989 | overlay_cache_invalid = 1; |
990 | ||
991 | /* We have to invalidate the registers BEFORE calling target_wait | |
992 | because they can be loaded from the target while in target_wait. | |
993 | This makes remote debugging a bit more efficient for those | |
994 | targets that provide critical registers as part of their normal | |
995 | status mechanism. */ | |
996 | ||
997 | registers_changed (); | |
b83266a0 | 998 | |
c906108c SS |
999 | while (1) |
1000 | { | |
9a4105ab AC |
1001 | if (deprecated_target_wait_hook) |
1002 | ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp); | |
cd0fc7c3 | 1003 | else |
39f77062 | 1004 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
c906108c | 1005 | |
cd0fc7c3 SS |
1006 | /* Now figure out what to do with the result of the result. */ |
1007 | handle_inferior_event (ecs); | |
c906108c | 1008 | |
cd0fc7c3 SS |
1009 | if (!ecs->wait_some_more) |
1010 | break; | |
1011 | } | |
1012 | do_cleanups (old_cleanups); | |
1013 | } | |
c906108c | 1014 | |
43ff13b4 JM |
1015 | /* Asynchronous version of wait_for_inferior. It is called by the |
1016 | event loop whenever a change of state is detected on the file | |
1017 | descriptor corresponding to the target. It can be called more than | |
1018 | once to complete a single execution command. In such cases we need | |
1019 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1020 | last time that this function is called for a single execution | |
1021 | command, then report to the user that the inferior has stopped, and | |
1022 | do the necessary cleanups. */ | |
1023 | ||
1024 | struct execution_control_state async_ecss; | |
1025 | struct execution_control_state *async_ecs; | |
1026 | ||
1027 | void | |
fba45db2 | 1028 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1029 | { |
1030 | static struct cleanup *old_cleanups; | |
1031 | ||
c5aa993b | 1032 | async_ecs = &async_ecss; |
43ff13b4 JM |
1033 | |
1034 | if (!async_ecs->wait_some_more) | |
1035 | { | |
488f131b | 1036 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
c5aa993b | 1037 | &step_resume_breakpoint); |
43ff13b4 JM |
1038 | |
1039 | /* Fill in with reasonable starting values. */ | |
1040 | init_execution_control_state (async_ecs); | |
1041 | ||
43ff13b4 | 1042 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1043 | previous_inferior_ptid = inferior_ptid; |
43ff13b4 JM |
1044 | |
1045 | overlay_cache_invalid = 1; | |
1046 | ||
1047 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1048 | because they can be loaded from the target while in target_wait. |
1049 | This makes remote debugging a bit more efficient for those | |
1050 | targets that provide critical registers as part of their normal | |
1051 | status mechanism. */ | |
43ff13b4 JM |
1052 | |
1053 | registers_changed (); | |
1054 | } | |
1055 | ||
9a4105ab | 1056 | if (deprecated_target_wait_hook) |
488f131b | 1057 | async_ecs->ptid = |
9a4105ab | 1058 | deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 | 1059 | else |
39f77062 | 1060 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 JM |
1061 | |
1062 | /* Now figure out what to do with the result of the result. */ | |
1063 | handle_inferior_event (async_ecs); | |
1064 | ||
1065 | if (!async_ecs->wait_some_more) | |
1066 | { | |
adf40b2e | 1067 | /* Do only the cleanups that have been added by this |
488f131b JB |
1068 | function. Let the continuations for the commands do the rest, |
1069 | if there are any. */ | |
43ff13b4 JM |
1070 | do_exec_cleanups (old_cleanups); |
1071 | normal_stop (); | |
c2d11a7d JM |
1072 | if (step_multi && stop_step) |
1073 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1074 | else | |
1075 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1076 | } |
1077 | } | |
1078 | ||
cd0fc7c3 SS |
1079 | /* Prepare an execution control state for looping through a |
1080 | wait_for_inferior-type loop. */ | |
1081 | ||
1082 | void | |
96baa820 | 1083 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1084 | { |
6ad80df0 | 1085 | ecs->another_trap = 0; |
cd0fc7c3 | 1086 | ecs->random_signal = 0; |
68f53502 | 1087 | ecs->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 | 1088 | ecs->handling_longjmp = 0; /* FIXME */ |
cd0fc7c3 SS |
1089 | ecs->stepping_through_solib_after_catch = 0; |
1090 | ecs->stepping_through_solib_catchpoints = NULL; | |
cd0fc7c3 SS |
1091 | ecs->sal = find_pc_line (prev_pc, 0); |
1092 | ecs->current_line = ecs->sal.line; | |
1093 | ecs->current_symtab = ecs->sal.symtab; | |
1094 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1095 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1096 | ecs->wp = &(ecs->ws); |
1097 | } | |
1098 | ||
e02bc4cc | 1099 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
1100 | target_wait()/deprecated_target_wait_hook(). The data is actually |
1101 | cached by handle_inferior_event(), which gets called immediately | |
1102 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
1103 | |
1104 | void | |
488f131b | 1105 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1106 | { |
39f77062 | 1107 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1108 | *status = target_last_waitstatus; |
1109 | } | |
1110 | ||
ac264b3b MS |
1111 | void |
1112 | nullify_last_target_wait_ptid (void) | |
1113 | { | |
1114 | target_last_wait_ptid = minus_one_ptid; | |
1115 | } | |
1116 | ||
dd80620e MS |
1117 | /* Switch thread contexts, maintaining "infrun state". */ |
1118 | ||
1119 | static void | |
1120 | context_switch (struct execution_control_state *ecs) | |
1121 | { | |
1122 | /* Caution: it may happen that the new thread (or the old one!) | |
1123 | is not in the thread list. In this case we must not attempt | |
1124 | to "switch context", or we run the risk that our context may | |
1125 | be lost. This may happen as a result of the target module | |
1126 | mishandling thread creation. */ | |
1127 | ||
fd48f117 DJ |
1128 | if (debug_infrun) |
1129 | { | |
1130 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
1131 | target_pid_to_str (inferior_ptid)); | |
1132 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
1133 | target_pid_to_str (ecs->ptid)); | |
1134 | } | |
1135 | ||
dd80620e | 1136 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) |
488f131b | 1137 | { /* Perform infrun state context switch: */ |
dd80620e | 1138 | /* Save infrun state for the old thread. */ |
0ce3d317 | 1139 | save_infrun_state (inferior_ptid, prev_pc, |
dd80620e | 1140 | trap_expected, step_resume_breakpoint, |
15960608 | 1141 | step_range_start, |
aa0cd9c1 | 1142 | step_range_end, &step_frame_id, |
dd80620e MS |
1143 | ecs->handling_longjmp, ecs->another_trap, |
1144 | ecs->stepping_through_solib_after_catch, | |
1145 | ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1146 | ecs->current_line, ecs->current_symtab); |
dd80620e MS |
1147 | |
1148 | /* Load infrun state for the new thread. */ | |
0ce3d317 | 1149 | load_infrun_state (ecs->ptid, &prev_pc, |
dd80620e | 1150 | &trap_expected, &step_resume_breakpoint, |
15960608 | 1151 | &step_range_start, |
aa0cd9c1 | 1152 | &step_range_end, &step_frame_id, |
dd80620e MS |
1153 | &ecs->handling_longjmp, &ecs->another_trap, |
1154 | &ecs->stepping_through_solib_after_catch, | |
1155 | &ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1156 | &ecs->current_line, &ecs->current_symtab); |
dd80620e MS |
1157 | } |
1158 | inferior_ptid = ecs->ptid; | |
35f196d9 | 1159 | reinit_frame_cache (); |
dd80620e MS |
1160 | } |
1161 | ||
4fa8626c DJ |
1162 | static void |
1163 | adjust_pc_after_break (struct execution_control_state *ecs) | |
1164 | { | |
8aad930b | 1165 | CORE_ADDR breakpoint_pc; |
4fa8626c DJ |
1166 | |
1167 | /* If this target does not decrement the PC after breakpoints, then | |
1168 | we have nothing to do. */ | |
1169 | if (DECR_PC_AFTER_BREAK == 0) | |
1170 | return; | |
1171 | ||
1172 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If | |
1173 | we aren't, just return. | |
9709f61c DJ |
1174 | |
1175 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
1176 | affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented | |
1177 | by software breakpoints should be handled through the normal breakpoint | |
1178 | layer. | |
8fb3e588 | 1179 | |
4fa8626c DJ |
1180 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
1181 | different signals (SIGILL or SIGEMT for instance), but it is less | |
1182 | clear where the PC is pointing afterwards. It may not match | |
1183 | DECR_PC_AFTER_BREAK. I don't know any specific target that generates | |
1184 | these signals at breakpoints (the code has been in GDB since at least | |
1185 | 1992) so I can not guess how to handle them here. | |
8fb3e588 | 1186 | |
4fa8626c DJ |
1187 | In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS |
1188 | would have the PC after hitting a watchpoint affected by | |
1189 | DECR_PC_AFTER_BREAK. I haven't found any target with both of these set | |
1190 | in GDB history, and it seems unlikely to be correct, so | |
1191 | HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */ | |
1192 | ||
1193 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
1194 | return; | |
1195 | ||
1196 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
1197 | return; | |
1198 | ||
8aad930b AC |
1199 | /* Find the location where (if we've hit a breakpoint) the |
1200 | breakpoint would be. */ | |
1201 | breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK; | |
1202 | ||
1203 | if (SOFTWARE_SINGLE_STEP_P ()) | |
1204 | { | |
1205 | /* When using software single-step, a SIGTRAP can only indicate | |
8fb3e588 AC |
1206 | an inserted breakpoint. This actually makes things |
1207 | easier. */ | |
8aad930b AC |
1208 | if (singlestep_breakpoints_inserted_p) |
1209 | /* When software single stepping, the instruction at [prev_pc] | |
1210 | is never a breakpoint, but the instruction following | |
1211 | [prev_pc] (in program execution order) always is. Assume | |
1212 | that following instruction was reached and hence a software | |
1213 | breakpoint was hit. */ | |
1214 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1215 | else if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1216 | /* The inferior was free running (i.e., no single-step | |
1217 | breakpoints inserted) and it hit a software breakpoint. */ | |
1218 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1219 | } | |
1220 | else | |
1221 | { | |
1222 | /* When using hardware single-step, a SIGTRAP is reported for | |
8fb3e588 AC |
1223 | both a completed single-step and a software breakpoint. Need |
1224 | to differentiate between the two as the latter needs | |
90225438 AS |
1225 | adjusting but the former does not. |
1226 | ||
1227 | When the thread to be examined does not match the current thread | |
1228 | context we can't use currently_stepping, so assume no | |
1229 | single-stepping in this case. */ | |
1230 | if (ptid_equal (ecs->ptid, inferior_ptid) && currently_stepping (ecs)) | |
8aad930b AC |
1231 | { |
1232 | if (prev_pc == breakpoint_pc | |
1233 | && software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1234 | /* Hardware single-stepped a software breakpoint (as | |
1235 | occures when the inferior is resumed with PC pointing | |
1236 | at not-yet-hit software breakpoint). Since the | |
1237 | breakpoint really is executed, the inferior needs to be | |
1238 | backed up to the breakpoint address. */ | |
1239 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1240 | } | |
1241 | else | |
1242 | { | |
1243 | if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1244 | /* The inferior was free running (i.e., no hardware | |
1245 | single-step and no possibility of a false SIGTRAP) and | |
1246 | hit a software breakpoint. */ | |
1247 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1248 | } | |
1249 | } | |
4fa8626c DJ |
1250 | } |
1251 | ||
cd0fc7c3 SS |
1252 | /* Given an execution control state that has been freshly filled in |
1253 | by an event from the inferior, figure out what it means and take | |
1254 | appropriate action. */ | |
c906108c | 1255 | |
7270d8f2 OF |
1256 | int stepped_after_stopped_by_watchpoint; |
1257 | ||
cd0fc7c3 | 1258 | void |
96baa820 | 1259 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 1260 | { |
8bbde302 BE |
1261 | /* NOTE: bje/2005-05-02: If you're looking at this code and thinking |
1262 | that the variable stepped_after_stopped_by_watchpoint isn't used, | |
1263 | then you're wrong! See remote.c:remote_stopped_data_address. */ | |
1264 | ||
c8edd8b4 | 1265 | int sw_single_step_trap_p = 0; |
8fb3e588 | 1266 | int stopped_by_watchpoint = -1; /* Mark as unknown. */ |
cd0fc7c3 | 1267 | |
e02bc4cc | 1268 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1269 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1270 | target_last_waitstatus = *ecs->wp; |
1271 | ||
4fa8626c DJ |
1272 | adjust_pc_after_break (ecs); |
1273 | ||
488f131b JB |
1274 | switch (ecs->infwait_state) |
1275 | { | |
1276 | case infwait_thread_hop_state: | |
527159b7 | 1277 | if (debug_infrun) |
8a9de0e4 | 1278 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); |
488f131b JB |
1279 | /* Cancel the waiton_ptid. */ |
1280 | ecs->waiton_ptid = pid_to_ptid (-1); | |
65e82032 | 1281 | break; |
b83266a0 | 1282 | |
488f131b | 1283 | case infwait_normal_state: |
527159b7 | 1284 | if (debug_infrun) |
8a9de0e4 | 1285 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
488f131b JB |
1286 | stepped_after_stopped_by_watchpoint = 0; |
1287 | break; | |
b83266a0 | 1288 | |
488f131b | 1289 | case infwait_nonstep_watch_state: |
527159b7 | 1290 | if (debug_infrun) |
8a9de0e4 AC |
1291 | fprintf_unfiltered (gdb_stdlog, |
1292 | "infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 1293 | insert_breakpoints (); |
c906108c | 1294 | |
488f131b JB |
1295 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1296 | handle things like signals arriving and other things happening | |
1297 | in combination correctly? */ | |
1298 | stepped_after_stopped_by_watchpoint = 1; | |
1299 | break; | |
65e82032 AC |
1300 | |
1301 | default: | |
e2e0b3e5 | 1302 | internal_error (__FILE__, __LINE__, _("bad switch")); |
488f131b JB |
1303 | } |
1304 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1305 | |
35f196d9 | 1306 | reinit_frame_cache (); |
c906108c | 1307 | |
488f131b | 1308 | /* If it's a new process, add it to the thread database */ |
c906108c | 1309 | |
488f131b | 1310 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
b9b5d7ea | 1311 | && !ptid_equal (ecs->ptid, minus_one_ptid) |
488f131b JB |
1312 | && !in_thread_list (ecs->ptid)); |
1313 | ||
1314 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1315 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1316 | { | |
1317 | add_thread (ecs->ptid); | |
c906108c | 1318 | |
488f131b JB |
1319 | ui_out_text (uiout, "[New "); |
1320 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); | |
1321 | ui_out_text (uiout, "]\n"); | |
488f131b | 1322 | } |
c906108c | 1323 | |
488f131b JB |
1324 | switch (ecs->ws.kind) |
1325 | { | |
1326 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 1327 | if (debug_infrun) |
8a9de0e4 | 1328 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
488f131b JB |
1329 | /* Ignore gracefully during startup of the inferior, as it |
1330 | might be the shell which has just loaded some objects, | |
1331 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1332 | #ifdef SOLIB_ADD |
c0236d92 | 1333 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b JB |
1334 | { |
1335 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1336 | breakpoint addresses via breakpoint_re_set. */ | |
1337 | if (breakpoints_inserted) | |
1338 | remove_breakpoints (); | |
c906108c | 1339 | |
488f131b JB |
1340 | /* Check for any newly added shared libraries if we're |
1341 | supposed to be adding them automatically. Switch | |
1342 | terminal for any messages produced by | |
1343 | breakpoint_re_set. */ | |
1344 | target_terminal_ours_for_output (); | |
aff6338a | 1345 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
1346 | stack's section table is kept up-to-date. Architectures, |
1347 | (e.g., PPC64), use the section table to perform | |
1348 | operations such as address => section name and hence | |
1349 | require the table to contain all sections (including | |
1350 | those found in shared libraries). */ | |
aff6338a | 1351 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
1352 | exec_ops to SOLIB_ADD. This is because current GDB is |
1353 | only tooled to propagate section_table changes out from | |
1354 | the "current_target" (see target_resize_to_sections), and | |
1355 | not up from the exec stratum. This, of course, isn't | |
1356 | right. "infrun.c" should only interact with the | |
1357 | exec/process stratum, instead relying on the target stack | |
1358 | to propagate relevant changes (stop, section table | |
1359 | changed, ...) up to other layers. */ | |
aff6338a | 1360 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
488f131b JB |
1361 | target_terminal_inferior (); |
1362 | ||
1363 | /* Reinsert breakpoints and continue. */ | |
1364 | if (breakpoints_inserted) | |
1365 | insert_breakpoints (); | |
1366 | } | |
c906108c | 1367 | #endif |
488f131b JB |
1368 | resume (0, TARGET_SIGNAL_0); |
1369 | prepare_to_wait (ecs); | |
1370 | return; | |
c5aa993b | 1371 | |
488f131b | 1372 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 1373 | if (debug_infrun) |
8a9de0e4 | 1374 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
488f131b JB |
1375 | resume (0, TARGET_SIGNAL_0); |
1376 | prepare_to_wait (ecs); | |
1377 | return; | |
c5aa993b | 1378 | |
488f131b | 1379 | case TARGET_WAITKIND_EXITED: |
527159b7 | 1380 | if (debug_infrun) |
8a9de0e4 | 1381 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n"); |
488f131b JB |
1382 | target_terminal_ours (); /* Must do this before mourn anyway */ |
1383 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
1384 | ||
1385 | /* Record the exit code in the convenience variable $_exitcode, so | |
1386 | that the user can inspect this again later. */ | |
1387 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1388 | value_from_longest (builtin_type_int, | |
1389 | (LONGEST) ecs->ws.value.integer)); | |
1390 | gdb_flush (gdb_stdout); | |
1391 | target_mourn_inferior (); | |
1392 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1393 | stop_print_frame = 0; | |
1394 | stop_stepping (ecs); | |
1395 | return; | |
c5aa993b | 1396 | |
488f131b | 1397 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 1398 | if (debug_infrun) |
8a9de0e4 | 1399 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n"); |
488f131b JB |
1400 | stop_print_frame = 0; |
1401 | stop_signal = ecs->ws.value.sig; | |
1402 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1403 | |
488f131b JB |
1404 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1405 | reach here unless the inferior is dead. However, for years | |
1406 | target_kill() was called here, which hints that fatal signals aren't | |
1407 | really fatal on some systems. If that's true, then some changes | |
1408 | may be needed. */ | |
1409 | target_mourn_inferior (); | |
c906108c | 1410 | |
488f131b JB |
1411 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
1412 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1413 | stop_stepping (ecs); | |
1414 | return; | |
c906108c | 1415 | |
488f131b JB |
1416 | /* The following are the only cases in which we keep going; |
1417 | the above cases end in a continue or goto. */ | |
1418 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 1419 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 1420 | if (debug_infrun) |
8a9de0e4 | 1421 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); |
488f131b JB |
1422 | stop_signal = TARGET_SIGNAL_TRAP; |
1423 | pending_follow.kind = ecs->ws.kind; | |
1424 | ||
8e7d2c16 DJ |
1425 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
1426 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c | 1427 | |
5a2901d9 DJ |
1428 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
1429 | { | |
1430 | context_switch (ecs); | |
35f196d9 | 1431 | reinit_frame_cache (); |
5a2901d9 DJ |
1432 | } |
1433 | ||
488f131b | 1434 | stop_pc = read_pc (); |
675bf4cb | 1435 | |
00d4360e | 1436 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1437 | |
488f131b | 1438 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
04e68871 DJ |
1439 | |
1440 | /* If no catchpoint triggered for this, then keep going. */ | |
1441 | if (ecs->random_signal) | |
1442 | { | |
1443 | stop_signal = TARGET_SIGNAL_0; | |
1444 | keep_going (ecs); | |
1445 | return; | |
1446 | } | |
488f131b JB |
1447 | goto process_event_stop_test; |
1448 | ||
1449 | case TARGET_WAITKIND_EXECD: | |
527159b7 | 1450 | if (debug_infrun) |
fc5261f2 | 1451 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b JB |
1452 | stop_signal = TARGET_SIGNAL_TRAP; |
1453 | ||
7d2830a3 | 1454 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
8fb3e588 AC |
1455 | target_wait function. Until then following vfork on HP/UX 10.20 |
1456 | is probably broken by this. Of course, it's broken anyway. */ | |
488f131b JB |
1457 | /* Is this a target which reports multiple exec events per actual |
1458 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1459 | ignore all but the last one. Just resume the exec'r, and wait | |
1460 | for the next exec event. */ | |
1461 | if (inferior_ignoring_leading_exec_events) | |
1462 | { | |
1463 | inferior_ignoring_leading_exec_events--; | |
488f131b JB |
1464 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); |
1465 | prepare_to_wait (ecs); | |
1466 | return; | |
1467 | } | |
1468 | inferior_ignoring_leading_exec_events = | |
1469 | target_reported_exec_events_per_exec_call () - 1; | |
1470 | ||
1471 | pending_follow.execd_pathname = | |
1472 | savestring (ecs->ws.value.execd_pathname, | |
1473 | strlen (ecs->ws.value.execd_pathname)); | |
1474 | ||
488f131b JB |
1475 | /* This causes the eventpoints and symbol table to be reset. Must |
1476 | do this now, before trying to determine whether to stop. */ | |
1477 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); | |
1478 | xfree (pending_follow.execd_pathname); | |
c906108c | 1479 | |
488f131b JB |
1480 | stop_pc = read_pc_pid (ecs->ptid); |
1481 | ecs->saved_inferior_ptid = inferior_ptid; | |
1482 | inferior_ptid = ecs->ptid; | |
675bf4cb | 1483 | |
00d4360e | 1484 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1485 | |
488f131b JB |
1486 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1487 | inferior_ptid = ecs->saved_inferior_ptid; | |
04e68871 | 1488 | |
5a2901d9 DJ |
1489 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
1490 | { | |
1491 | context_switch (ecs); | |
35f196d9 | 1492 | reinit_frame_cache (); |
5a2901d9 DJ |
1493 | } |
1494 | ||
04e68871 DJ |
1495 | /* If no catchpoint triggered for this, then keep going. */ |
1496 | if (ecs->random_signal) | |
1497 | { | |
1498 | stop_signal = TARGET_SIGNAL_0; | |
1499 | keep_going (ecs); | |
1500 | return; | |
1501 | } | |
488f131b JB |
1502 | goto process_event_stop_test; |
1503 | ||
b4dc5ffa MK |
1504 | /* Be careful not to try to gather much state about a thread |
1505 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 1506 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 1507 | if (debug_infrun) |
8a9de0e4 | 1508 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); |
488f131b JB |
1509 | resume (0, TARGET_SIGNAL_0); |
1510 | prepare_to_wait (ecs); | |
1511 | return; | |
c906108c | 1512 | |
488f131b JB |
1513 | /* Before examining the threads further, step this thread to |
1514 | get it entirely out of the syscall. (We get notice of the | |
1515 | event when the thread is just on the verge of exiting a | |
1516 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 1517 | into user code.) */ |
488f131b | 1518 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 1519 | if (debug_infrun) |
8a9de0e4 | 1520 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); |
488f131b | 1521 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
488f131b JB |
1522 | prepare_to_wait (ecs); |
1523 | return; | |
c906108c | 1524 | |
488f131b | 1525 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 1526 | if (debug_infrun) |
8a9de0e4 | 1527 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
488f131b JB |
1528 | stop_signal = ecs->ws.value.sig; |
1529 | break; | |
c906108c | 1530 | |
488f131b JB |
1531 | /* We had an event in the inferior, but we are not interested |
1532 | in handling it at this level. The lower layers have already | |
8e7d2c16 | 1533 | done what needs to be done, if anything. |
8fb3e588 AC |
1534 | |
1535 | One of the possible circumstances for this is when the | |
1536 | inferior produces output for the console. The inferior has | |
1537 | not stopped, and we are ignoring the event. Another possible | |
1538 | circumstance is any event which the lower level knows will be | |
1539 | reported multiple times without an intervening resume. */ | |
488f131b | 1540 | case TARGET_WAITKIND_IGNORE: |
527159b7 | 1541 | if (debug_infrun) |
8a9de0e4 | 1542 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); |
8e7d2c16 | 1543 | prepare_to_wait (ecs); |
488f131b JB |
1544 | return; |
1545 | } | |
c906108c | 1546 | |
488f131b JB |
1547 | /* We may want to consider not doing a resume here in order to give |
1548 | the user a chance to play with the new thread. It might be good | |
1549 | to make that a user-settable option. */ | |
c906108c | 1550 | |
488f131b JB |
1551 | /* At this point, all threads are stopped (happens automatically in |
1552 | either the OS or the native code). Therefore we need to continue | |
1553 | all threads in order to make progress. */ | |
1554 | if (ecs->new_thread_event) | |
1555 | { | |
1556 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1557 | prepare_to_wait (ecs); | |
1558 | return; | |
1559 | } | |
c906108c | 1560 | |
488f131b JB |
1561 | stop_pc = read_pc_pid (ecs->ptid); |
1562 | ||
527159b7 | 1563 | if (debug_infrun) |
8a9de0e4 | 1564 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc)); |
527159b7 | 1565 | |
9f976b41 DJ |
1566 | if (stepping_past_singlestep_breakpoint) |
1567 | { | |
8fb3e588 AC |
1568 | gdb_assert (SOFTWARE_SINGLE_STEP_P () |
1569 | && singlestep_breakpoints_inserted_p); | |
9f976b41 DJ |
1570 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
1571 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
1572 | ||
1573 | stepping_past_singlestep_breakpoint = 0; | |
1574 | ||
1575 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
1576 | breakpoint, or stopped for some other reason. It would be nice if |
1577 | we could tell, but we can't reliably. */ | |
9f976b41 | 1578 | if (stop_signal == TARGET_SIGNAL_TRAP) |
8fb3e588 | 1579 | { |
527159b7 | 1580 | if (debug_infrun) |
8a9de0e4 | 1581 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n"); |
9f976b41 DJ |
1582 | /* Pull the single step breakpoints out of the target. */ |
1583 | SOFTWARE_SINGLE_STEP (0, 0); | |
1584 | singlestep_breakpoints_inserted_p = 0; | |
1585 | ||
1586 | ecs->random_signal = 0; | |
1587 | ||
1588 | ecs->ptid = saved_singlestep_ptid; | |
1589 | context_switch (ecs); | |
9a4105ab AC |
1590 | if (deprecated_context_hook) |
1591 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
1592 | |
1593 | resume (1, TARGET_SIGNAL_0); | |
1594 | prepare_to_wait (ecs); | |
1595 | return; | |
1596 | } | |
1597 | } | |
1598 | ||
1599 | stepping_past_singlestep_breakpoint = 0; | |
1600 | ||
488f131b JB |
1601 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1602 | another thread. If so, then step that thread past the breakpoint, | |
1603 | and continue it. */ | |
1604 | ||
1605 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1606 | { | |
9f976b41 DJ |
1607 | int thread_hop_needed = 0; |
1608 | ||
f8d40ec8 JB |
1609 | /* Check if a regular breakpoint has been hit before checking |
1610 | for a potential single step breakpoint. Otherwise, GDB will | |
1611 | not see this breakpoint hit when stepping onto breakpoints. */ | |
4fa8626c | 1612 | if (breakpoints_inserted && breakpoint_here_p (stop_pc)) |
488f131b | 1613 | { |
c5aa993b | 1614 | ecs->random_signal = 0; |
4fa8626c | 1615 | if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
9f976b41 DJ |
1616 | thread_hop_needed = 1; |
1617 | } | |
1618 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
1619 | { | |
fd48f117 DJ |
1620 | /* We have not context switched yet, so this should be true |
1621 | no matter which thread hit the singlestep breakpoint. */ | |
1622 | gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid)); | |
1623 | if (debug_infrun) | |
1624 | fprintf_unfiltered (gdb_stdlog, "infrun: software single step " | |
1625 | "trap for %s\n", | |
1626 | target_pid_to_str (ecs->ptid)); | |
1627 | ||
9f976b41 DJ |
1628 | ecs->random_signal = 0; |
1629 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
1630 | change when we go from single-threaded to multi-threaded. If | |
1631 | the singlestep_ptid is still in the list, assume that it is | |
1632 | really different from ecs->ptid. */ | |
1633 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
1634 | && in_thread_list (singlestep_ptid)) | |
1635 | { | |
fd48f117 DJ |
1636 | /* If the PC of the thread we were trying to single-step |
1637 | has changed, discard this event (which we were going | |
1638 | to ignore anyway), and pretend we saw that thread | |
1639 | trap. This prevents us continuously moving the | |
1640 | single-step breakpoint forward, one instruction at a | |
1641 | time. If the PC has changed, then the thread we were | |
1642 | trying to single-step has trapped or been signalled, | |
1643 | but the event has not been reported to GDB yet. | |
1644 | ||
1645 | There might be some cases where this loses signal | |
1646 | information, if a signal has arrived at exactly the | |
1647 | same time that the PC changed, but this is the best | |
1648 | we can do with the information available. Perhaps we | |
1649 | should arrange to report all events for all threads | |
1650 | when they stop, or to re-poll the remote looking for | |
1651 | this particular thread (i.e. temporarily enable | |
1652 | schedlock). */ | |
1653 | if (read_pc_pid (singlestep_ptid) != singlestep_pc) | |
1654 | { | |
1655 | if (debug_infrun) | |
1656 | fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread," | |
1657 | " but expected thread advanced also\n"); | |
1658 | ||
1659 | /* The current context still belongs to | |
1660 | singlestep_ptid. Don't swap here, since that's | |
1661 | the context we want to use. Just fudge our | |
1662 | state and continue. */ | |
1663 | ecs->ptid = singlestep_ptid; | |
1664 | stop_pc = read_pc_pid (ecs->ptid); | |
1665 | } | |
1666 | else | |
1667 | { | |
1668 | if (debug_infrun) | |
1669 | fprintf_unfiltered (gdb_stdlog, | |
1670 | "infrun: unexpected thread\n"); | |
1671 | ||
1672 | thread_hop_needed = 1; | |
1673 | stepping_past_singlestep_breakpoint = 1; | |
1674 | saved_singlestep_ptid = singlestep_ptid; | |
1675 | } | |
9f976b41 DJ |
1676 | } |
1677 | } | |
1678 | ||
1679 | if (thread_hop_needed) | |
8fb3e588 AC |
1680 | { |
1681 | int remove_status; | |
1682 | ||
527159b7 | 1683 | if (debug_infrun) |
8a9de0e4 | 1684 | fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); |
527159b7 | 1685 | |
8fb3e588 AC |
1686 | /* Saw a breakpoint, but it was hit by the wrong thread. |
1687 | Just continue. */ | |
1688 | ||
1689 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
488f131b | 1690 | { |
8fb3e588 AC |
1691 | /* Pull the single step breakpoints out of the target. */ |
1692 | SOFTWARE_SINGLE_STEP (0, 0); | |
1693 | singlestep_breakpoints_inserted_p = 0; | |
1694 | } | |
1695 | ||
1696 | remove_status = remove_breakpoints (); | |
1697 | /* Did we fail to remove breakpoints? If so, try | |
1698 | to set the PC past the bp. (There's at least | |
1699 | one situation in which we can fail to remove | |
1700 | the bp's: On HP-UX's that use ttrace, we can't | |
1701 | change the address space of a vforking child | |
1702 | process until the child exits (well, okay, not | |
1703 | then either :-) or execs. */ | |
1704 | if (remove_status != 0) | |
1705 | { | |
1706 | /* FIXME! This is obviously non-portable! */ | |
1707 | write_pc_pid (stop_pc + 4, ecs->ptid); | |
1708 | /* We need to restart all the threads now, | |
1709 | * unles we're running in scheduler-locked mode. | |
1710 | * Use currently_stepping to determine whether to | |
1711 | * step or continue. | |
1712 | */ | |
1713 | /* FIXME MVS: is there any reason not to call resume()? */ | |
1714 | if (scheduler_mode == schedlock_on) | |
1715 | target_resume (ecs->ptid, | |
1716 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
488f131b | 1717 | else |
8fb3e588 AC |
1718 | target_resume (RESUME_ALL, |
1719 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1720 | prepare_to_wait (ecs); | |
1721 | return; | |
1722 | } | |
1723 | else | |
1724 | { /* Single step */ | |
1725 | breakpoints_inserted = 0; | |
1726 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
1727 | context_switch (ecs); | |
1728 | ecs->waiton_ptid = ecs->ptid; | |
1729 | ecs->wp = &(ecs->ws); | |
1730 | ecs->another_trap = 1; | |
1731 | ||
1732 | ecs->infwait_state = infwait_thread_hop_state; | |
1733 | keep_going (ecs); | |
1734 | registers_changed (); | |
1735 | return; | |
1736 | } | |
488f131b | 1737 | } |
f8d40ec8 | 1738 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
8fb3e588 AC |
1739 | { |
1740 | sw_single_step_trap_p = 1; | |
1741 | ecs->random_signal = 0; | |
1742 | } | |
488f131b JB |
1743 | } |
1744 | else | |
1745 | ecs->random_signal = 1; | |
c906108c | 1746 | |
488f131b | 1747 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
1748 | so, then switch to that thread. */ |
1749 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 1750 | { |
527159b7 | 1751 | if (debug_infrun) |
8a9de0e4 | 1752 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 1753 | |
488f131b | 1754 | context_switch (ecs); |
c5aa993b | 1755 | |
9a4105ab AC |
1756 | if (deprecated_context_hook) |
1757 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 1758 | } |
c906108c | 1759 | |
488f131b JB |
1760 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1761 | { | |
1762 | /* Pull the single step breakpoints out of the target. */ | |
1763 | SOFTWARE_SINGLE_STEP (0, 0); | |
1764 | singlestep_breakpoints_inserted_p = 0; | |
1765 | } | |
c906108c | 1766 | |
488f131b JB |
1767 | /* It may not be necessary to disable the watchpoint to stop over |
1768 | it. For example, the PA can (with some kernel cooperation) | |
1769 | single step over a watchpoint without disabling the watchpoint. */ | |
1770 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1771 | { | |
527159b7 | 1772 | if (debug_infrun) |
8a9de0e4 | 1773 | fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n"); |
488f131b JB |
1774 | resume (1, 0); |
1775 | prepare_to_wait (ecs); | |
1776 | return; | |
1777 | } | |
c906108c | 1778 | |
488f131b JB |
1779 | /* It is far more common to need to disable a watchpoint to step |
1780 | the inferior over it. FIXME. What else might a debug | |
1781 | register or page protection watchpoint scheme need here? */ | |
1782 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1783 | { | |
1784 | /* At this point, we are stopped at an instruction which has | |
1785 | attempted to write to a piece of memory under control of | |
1786 | a watchpoint. The instruction hasn't actually executed | |
1787 | yet. If we were to evaluate the watchpoint expression | |
1788 | now, we would get the old value, and therefore no change | |
1789 | would seem to have occurred. | |
1790 | ||
1791 | In order to make watchpoints work `right', we really need | |
1792 | to complete the memory write, and then evaluate the | |
1793 | watchpoint expression. The following code does that by | |
1794 | removing the watchpoint (actually, all watchpoints and | |
1795 | breakpoints), single-stepping the target, re-inserting | |
1796 | watchpoints, and then falling through to let normal | |
1797 | single-step processing handle proceed. Since this | |
1798 | includes evaluating watchpoints, things will come to a | |
1799 | stop in the correct manner. */ | |
1800 | ||
527159b7 | 1801 | if (debug_infrun) |
8a9de0e4 | 1802 | fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n"); |
488f131b JB |
1803 | remove_breakpoints (); |
1804 | registers_changed (); | |
1805 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
c5aa993b | 1806 | |
488f131b JB |
1807 | ecs->waiton_ptid = ecs->ptid; |
1808 | ecs->wp = &(ecs->ws); | |
1809 | ecs->infwait_state = infwait_nonstep_watch_state; | |
1810 | prepare_to_wait (ecs); | |
1811 | return; | |
1812 | } | |
1813 | ||
1814 | /* It may be possible to simply continue after a watchpoint. */ | |
1815 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
00d4360e | 1816 | stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws); |
488f131b JB |
1817 | |
1818 | ecs->stop_func_start = 0; | |
1819 | ecs->stop_func_end = 0; | |
1820 | ecs->stop_func_name = 0; | |
1821 | /* Don't care about return value; stop_func_start and stop_func_name | |
1822 | will both be 0 if it doesn't work. */ | |
1823 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
1824 | &ecs->stop_func_start, &ecs->stop_func_end); | |
782263ab | 1825 | ecs->stop_func_start += DEPRECATED_FUNCTION_START_OFFSET; |
488f131b JB |
1826 | ecs->another_trap = 0; |
1827 | bpstat_clear (&stop_bpstat); | |
1828 | stop_step = 0; | |
1829 | stop_stack_dummy = 0; | |
1830 | stop_print_frame = 1; | |
1831 | ecs->random_signal = 0; | |
1832 | stopped_by_random_signal = 0; | |
1833 | breakpoints_failed = 0; | |
1834 | ||
3352ef37 AC |
1835 | if (stop_signal == TARGET_SIGNAL_TRAP |
1836 | && trap_expected | |
1837 | && gdbarch_single_step_through_delay_p (current_gdbarch) | |
1838 | && currently_stepping (ecs)) | |
1839 | { | |
1840 | /* We're trying to step of a breakpoint. Turns out that we're | |
1841 | also on an instruction that needs to be stepped multiple | |
1842 | times before it's been fully executing. E.g., architectures | |
1843 | with a delay slot. It needs to be stepped twice, once for | |
1844 | the instruction and once for the delay slot. */ | |
1845 | int step_through_delay | |
1846 | = gdbarch_single_step_through_delay (current_gdbarch, | |
1847 | get_current_frame ()); | |
527159b7 | 1848 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 1849 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
3352ef37 AC |
1850 | if (step_range_end == 0 && step_through_delay) |
1851 | { | |
1852 | /* The user issued a continue when stopped at a breakpoint. | |
1853 | Set up for another trap and get out of here. */ | |
1854 | ecs->another_trap = 1; | |
1855 | keep_going (ecs); | |
1856 | return; | |
1857 | } | |
1858 | else if (step_through_delay) | |
1859 | { | |
1860 | /* The user issued a step when stopped at a breakpoint. | |
1861 | Maybe we should stop, maybe we should not - the delay | |
1862 | slot *might* correspond to a line of source. In any | |
1863 | case, don't decide that here, just set ecs->another_trap, | |
1864 | making sure we single-step again before breakpoints are | |
1865 | re-inserted. */ | |
1866 | ecs->another_trap = 1; | |
1867 | } | |
1868 | } | |
1869 | ||
488f131b JB |
1870 | /* Look at the cause of the stop, and decide what to do. |
1871 | The alternatives are: | |
1872 | 1) break; to really stop and return to the debugger, | |
1873 | 2) drop through to start up again | |
1874 | (set ecs->another_trap to 1 to single step once) | |
1875 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
1876 | will be made according to the signal handling tables. */ | |
1877 | ||
1878 | /* First, distinguish signals caused by the debugger from signals | |
03cebad2 MK |
1879 | that have to do with the program's own actions. Note that |
1880 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
1881 | on the operating system version. Here we detect when a SIGILL or | |
1882 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
1883 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
1884 | when we're trying to execute a breakpoint instruction on a | |
1885 | non-executable stack. This happens for call dummy breakpoints | |
1886 | for architectures like SPARC that place call dummies on the | |
1887 | stack. */ | |
488f131b JB |
1888 | |
1889 | if (stop_signal == TARGET_SIGNAL_TRAP | |
8fb3e588 AC |
1890 | || (breakpoints_inserted |
1891 | && (stop_signal == TARGET_SIGNAL_ILL | |
1892 | || stop_signal == TARGET_SIGNAL_SEGV | |
1893 | || stop_signal == TARGET_SIGNAL_EMT)) | |
1894 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP) | |
488f131b JB |
1895 | { |
1896 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1897 | { | |
527159b7 | 1898 | if (debug_infrun) |
8a9de0e4 | 1899 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); |
488f131b JB |
1900 | stop_print_frame = 0; |
1901 | stop_stepping (ecs); | |
1902 | return; | |
1903 | } | |
c54cfec8 EZ |
1904 | |
1905 | /* This is originated from start_remote(), start_inferior() and | |
1906 | shared libraries hook functions. */ | |
c0236d92 | 1907 | if (stop_soon == STOP_QUIETLY) |
488f131b | 1908 | { |
527159b7 | 1909 | if (debug_infrun) |
8a9de0e4 | 1910 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); |
488f131b JB |
1911 | stop_stepping (ecs); |
1912 | return; | |
1913 | } | |
1914 | ||
c54cfec8 EZ |
1915 | /* This originates from attach_command(). We need to overwrite |
1916 | the stop_signal here, because some kernels don't ignore a | |
1917 | SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call. | |
1918 | See more comments in inferior.h. */ | |
c0236d92 | 1919 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
c54cfec8 EZ |
1920 | { |
1921 | stop_stepping (ecs); | |
1922 | if (stop_signal == TARGET_SIGNAL_STOP) | |
1923 | stop_signal = TARGET_SIGNAL_0; | |
1924 | return; | |
1925 | } | |
1926 | ||
d303a6c7 AC |
1927 | /* Don't even think about breakpoints if just proceeded over a |
1928 | breakpoint. */ | |
1929 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected) | |
527159b7 RC |
1930 | { |
1931 | if (debug_infrun) | |
8a9de0e4 | 1932 | fprintf_unfiltered (gdb_stdlog, "infrun: trap expected\n"); |
527159b7 RC |
1933 | bpstat_clear (&stop_bpstat); |
1934 | } | |
488f131b JB |
1935 | else |
1936 | { | |
1937 | /* See if there is a breakpoint at the current PC. */ | |
8fb3e588 | 1938 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, |
00d4360e | 1939 | stopped_by_watchpoint); |
488f131b | 1940 | |
488f131b JB |
1941 | /* Following in case break condition called a |
1942 | function. */ | |
1943 | stop_print_frame = 1; | |
1944 | } | |
1945 | ||
73dd234f | 1946 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
1947 | at one stage in the past included checks for an inferior |
1948 | function call's call dummy's return breakpoint. The original | |
1949 | comment, that went with the test, read: | |
73dd234f | 1950 | |
8fb3e588 AC |
1951 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
1952 | another signal besides SIGTRAP, so check here as well as | |
1953 | above.'' | |
73dd234f AC |
1954 | |
1955 | If someone ever tries to get get call dummys on a | |
1956 | non-executable stack to work (where the target would stop | |
03cebad2 MK |
1957 | with something like a SIGSEGV), then those tests might need |
1958 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 1959 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
1960 | suspect that it won't be the case. |
1961 | ||
8fb3e588 AC |
1962 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
1963 | be necessary for call dummies on a non-executable stack on | |
1964 | SPARC. */ | |
73dd234f | 1965 | |
488f131b JB |
1966 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1967 | ecs->random_signal | |
1968 | = !(bpstat_explains_signal (stop_bpstat) | |
1969 | || trap_expected | |
488f131b | 1970 | || (step_range_end && step_resume_breakpoint == NULL)); |
488f131b JB |
1971 | else |
1972 | { | |
73dd234f | 1973 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
488f131b JB |
1974 | if (!ecs->random_signal) |
1975 | stop_signal = TARGET_SIGNAL_TRAP; | |
1976 | } | |
1977 | } | |
1978 | ||
1979 | /* When we reach this point, we've pretty much decided | |
1980 | that the reason for stopping must've been a random | |
1981 | (unexpected) signal. */ | |
1982 | ||
1983 | else | |
1984 | ecs->random_signal = 1; | |
488f131b | 1985 | |
04e68871 | 1986 | process_event_stop_test: |
488f131b JB |
1987 | /* For the program's own signals, act according to |
1988 | the signal handling tables. */ | |
1989 | ||
1990 | if (ecs->random_signal) | |
1991 | { | |
1992 | /* Signal not for debugging purposes. */ | |
1993 | int printed = 0; | |
1994 | ||
527159b7 | 1995 | if (debug_infrun) |
8a9de0e4 | 1996 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", stop_signal); |
527159b7 | 1997 | |
488f131b JB |
1998 | stopped_by_random_signal = 1; |
1999 | ||
2000 | if (signal_print[stop_signal]) | |
2001 | { | |
2002 | printed = 1; | |
2003 | target_terminal_ours_for_output (); | |
2004 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
2005 | } | |
2006 | if (signal_stop[stop_signal]) | |
2007 | { | |
2008 | stop_stepping (ecs); | |
2009 | return; | |
2010 | } | |
2011 | /* If not going to stop, give terminal back | |
2012 | if we took it away. */ | |
2013 | else if (printed) | |
2014 | target_terminal_inferior (); | |
2015 | ||
2016 | /* Clear the signal if it should not be passed. */ | |
2017 | if (signal_program[stop_signal] == 0) | |
2018 | stop_signal = TARGET_SIGNAL_0; | |
2019 | ||
68f53502 AC |
2020 | if (prev_pc == read_pc () |
2021 | && !breakpoints_inserted | |
2022 | && breakpoint_here_p (read_pc ()) | |
2023 | && step_resume_breakpoint == NULL) | |
2024 | { | |
2025 | /* We were just starting a new sequence, attempting to | |
2026 | single-step off of a breakpoint and expecting a SIGTRAP. | |
2027 | Intead this signal arrives. This signal will take us out | |
2028 | of the stepping range so GDB needs to remember to, when | |
2029 | the signal handler returns, resume stepping off that | |
2030 | breakpoint. */ | |
2031 | /* To simplify things, "continue" is forced to use the same | |
2032 | code paths as single-step - set a breakpoint at the | |
2033 | signal return address and then, once hit, step off that | |
2034 | breakpoint. */ | |
44cbf7b5 | 2035 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
68f53502 | 2036 | ecs->step_after_step_resume_breakpoint = 1; |
9d799f85 AC |
2037 | keep_going (ecs); |
2038 | return; | |
68f53502 | 2039 | } |
9d799f85 AC |
2040 | |
2041 | if (step_range_end != 0 | |
2042 | && stop_signal != TARGET_SIGNAL_0 | |
2043 | && stop_pc >= step_range_start && stop_pc < step_range_end | |
2044 | && frame_id_eq (get_frame_id (get_current_frame ()), | |
2045 | step_frame_id) | |
2046 | && step_resume_breakpoint == NULL) | |
d303a6c7 AC |
2047 | { |
2048 | /* The inferior is about to take a signal that will take it | |
2049 | out of the single step range. Set a breakpoint at the | |
2050 | current PC (which is presumably where the signal handler | |
2051 | will eventually return) and then allow the inferior to | |
2052 | run free. | |
2053 | ||
2054 | Note that this is only needed for a signal delivered | |
2055 | while in the single-step range. Nested signals aren't a | |
2056 | problem as they eventually all return. */ | |
44cbf7b5 | 2057 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
9d799f85 AC |
2058 | keep_going (ecs); |
2059 | return; | |
d303a6c7 | 2060 | } |
9d799f85 AC |
2061 | |
2062 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
2063 | when either there's a nested signal, or when there's a | |
2064 | pending signal enabled just as the signal handler returns | |
2065 | (leaving the inferior at the step-resume-breakpoint without | |
2066 | actually executing it). Either way continue until the | |
2067 | breakpoint is really hit. */ | |
488f131b JB |
2068 | keep_going (ecs); |
2069 | return; | |
2070 | } | |
2071 | ||
2072 | /* Handle cases caused by hitting a breakpoint. */ | |
2073 | { | |
2074 | CORE_ADDR jmp_buf_pc; | |
2075 | struct bpstat_what what; | |
2076 | ||
2077 | what = bpstat_what (stop_bpstat); | |
2078 | ||
2079 | if (what.call_dummy) | |
2080 | { | |
2081 | stop_stack_dummy = 1; | |
c5aa993b | 2082 | } |
c906108c | 2083 | |
488f131b | 2084 | switch (what.main_action) |
c5aa993b | 2085 | { |
488f131b JB |
2086 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2087 | /* If we hit the breakpoint at longjmp, disable it for the | |
2088 | duration of this command. Then, install a temporary | |
2089 | breakpoint at the target of the jmp_buf. */ | |
527159b7 | 2090 | if (debug_infrun) |
8802d8ed | 2091 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); |
488f131b JB |
2092 | disable_longjmp_breakpoint (); |
2093 | remove_breakpoints (); | |
2094 | breakpoints_inserted = 0; | |
2095 | if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
c5aa993b | 2096 | { |
488f131b | 2097 | keep_going (ecs); |
104c1213 | 2098 | return; |
c5aa993b | 2099 | } |
488f131b JB |
2100 | |
2101 | /* Need to blow away step-resume breakpoint, as it | |
2102 | interferes with us */ | |
2103 | if (step_resume_breakpoint != NULL) | |
104c1213 | 2104 | { |
488f131b | 2105 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
104c1213 | 2106 | } |
c906108c | 2107 | |
8fb3e588 | 2108 | set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
488f131b JB |
2109 | ecs->handling_longjmp = 1; /* FIXME */ |
2110 | keep_going (ecs); | |
2111 | return; | |
c906108c | 2112 | |
488f131b JB |
2113 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2114 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
527159b7 | 2115 | if (debug_infrun) |
8802d8ed | 2116 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); |
488f131b JB |
2117 | remove_breakpoints (); |
2118 | breakpoints_inserted = 0; | |
488f131b JB |
2119 | disable_longjmp_breakpoint (); |
2120 | ecs->handling_longjmp = 0; /* FIXME */ | |
2121 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2122 | break; | |
2123 | /* else fallthrough */ | |
2124 | ||
2125 | case BPSTAT_WHAT_SINGLE: | |
527159b7 | 2126 | if (debug_infrun) |
8802d8ed | 2127 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); |
488f131b | 2128 | if (breakpoints_inserted) |
c5aa993b | 2129 | { |
488f131b | 2130 | remove_breakpoints (); |
c5aa993b | 2131 | } |
488f131b JB |
2132 | breakpoints_inserted = 0; |
2133 | ecs->another_trap = 1; | |
2134 | /* Still need to check other stuff, at least the case | |
2135 | where we are stepping and step out of the right range. */ | |
2136 | break; | |
c906108c | 2137 | |
488f131b | 2138 | case BPSTAT_WHAT_STOP_NOISY: |
527159b7 | 2139 | if (debug_infrun) |
8802d8ed | 2140 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); |
488f131b | 2141 | stop_print_frame = 1; |
c906108c | 2142 | |
d303a6c7 AC |
2143 | /* We are about to nuke the step_resume_breakpointt via the |
2144 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2145 | |
488f131b JB |
2146 | stop_stepping (ecs); |
2147 | return; | |
c5aa993b | 2148 | |
488f131b | 2149 | case BPSTAT_WHAT_STOP_SILENT: |
527159b7 | 2150 | if (debug_infrun) |
8802d8ed | 2151 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); |
488f131b | 2152 | stop_print_frame = 0; |
c5aa993b | 2153 | |
d303a6c7 AC |
2154 | /* We are about to nuke the step_resume_breakpoin via the |
2155 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2156 | |
488f131b | 2157 | stop_stepping (ecs); |
e441088d | 2158 | return; |
c5aa993b | 2159 | |
488f131b JB |
2160 | case BPSTAT_WHAT_STEP_RESUME: |
2161 | /* This proably demands a more elegant solution, but, yeah | |
2162 | right... | |
c5aa993b | 2163 | |
488f131b JB |
2164 | This function's use of the simple variable |
2165 | step_resume_breakpoint doesn't seem to accomodate | |
2166 | simultaneously active step-resume bp's, although the | |
2167 | breakpoint list certainly can. | |
c5aa993b | 2168 | |
488f131b JB |
2169 | If we reach here and step_resume_breakpoint is already |
2170 | NULL, then apparently we have multiple active | |
2171 | step-resume bp's. We'll just delete the breakpoint we | |
2172 | stopped at, and carry on. | |
2173 | ||
2174 | Correction: what the code currently does is delete a | |
2175 | step-resume bp, but it makes no effort to ensure that | |
2176 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2177 | |
527159b7 | 2178 | if (debug_infrun) |
8802d8ed | 2179 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); |
527159b7 | 2180 | |
488f131b JB |
2181 | if (step_resume_breakpoint == NULL) |
2182 | { | |
2183 | step_resume_breakpoint = | |
2184 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2185 | } | |
2186 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
68f53502 AC |
2187 | if (ecs->step_after_step_resume_breakpoint) |
2188 | { | |
2189 | /* Back when the step-resume breakpoint was inserted, we | |
2190 | were trying to single-step off a breakpoint. Go back | |
2191 | to doing that. */ | |
2192 | ecs->step_after_step_resume_breakpoint = 0; | |
2193 | remove_breakpoints (); | |
2194 | breakpoints_inserted = 0; | |
2195 | ecs->another_trap = 1; | |
2196 | keep_going (ecs); | |
2197 | return; | |
2198 | } | |
488f131b JB |
2199 | break; |
2200 | ||
2201 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
527159b7 | 2202 | if (debug_infrun) |
8802d8ed | 2203 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_THROUGH_SIGTRAMP\n"); |
488f131b JB |
2204 | /* If were waiting for a trap, hitting the step_resume_break |
2205 | doesn't count as getting it. */ | |
2206 | if (trap_expected) | |
2207 | ecs->another_trap = 1; | |
2208 | break; | |
2209 | ||
2210 | case BPSTAT_WHAT_CHECK_SHLIBS: | |
2211 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
c906108c | 2212 | { |
527159b7 | 2213 | if (debug_infrun) |
8802d8ed | 2214 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n"); |
488f131b JB |
2215 | /* Remove breakpoints, we eventually want to step over the |
2216 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2217 | breakpoint addresses via breakpoint_re_set. */ | |
2218 | if (breakpoints_inserted) | |
2219 | remove_breakpoints (); | |
c5aa993b | 2220 | breakpoints_inserted = 0; |
488f131b JB |
2221 | |
2222 | /* Check for any newly added shared libraries if we're | |
2223 | supposed to be adding them automatically. Switch | |
2224 | terminal for any messages produced by | |
2225 | breakpoint_re_set. */ | |
2226 | target_terminal_ours_for_output (); | |
aff6338a | 2227 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
2228 | stack's section table is kept up-to-date. Architectures, |
2229 | (e.g., PPC64), use the section table to perform | |
2230 | operations such as address => section name and hence | |
2231 | require the table to contain all sections (including | |
2232 | those found in shared libraries). */ | |
aff6338a | 2233 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
2234 | exec_ops to SOLIB_ADD. This is because current GDB is |
2235 | only tooled to propagate section_table changes out from | |
2236 | the "current_target" (see target_resize_to_sections), and | |
2237 | not up from the exec stratum. This, of course, isn't | |
2238 | right. "infrun.c" should only interact with the | |
2239 | exec/process stratum, instead relying on the target stack | |
2240 | to propagate relevant changes (stop, section table | |
2241 | changed, ...) up to other layers. */ | |
a77053c2 | 2242 | #ifdef SOLIB_ADD |
aff6338a | 2243 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
a77053c2 MK |
2244 | #else |
2245 | solib_add (NULL, 0, ¤t_target, auto_solib_add); | |
2246 | #endif | |
488f131b JB |
2247 | target_terminal_inferior (); |
2248 | ||
2249 | /* Try to reenable shared library breakpoints, additional | |
2250 | code segments in shared libraries might be mapped in now. */ | |
2251 | re_enable_breakpoints_in_shlibs (); | |
2252 | ||
2253 | /* If requested, stop when the dynamic linker notifies | |
2254 | gdb of events. This allows the user to get control | |
2255 | and place breakpoints in initializer routines for | |
2256 | dynamically loaded objects (among other things). */ | |
877522db | 2257 | if (stop_on_solib_events || stop_stack_dummy) |
d4f3574e | 2258 | { |
488f131b | 2259 | stop_stepping (ecs); |
d4f3574e SS |
2260 | return; |
2261 | } | |
c5aa993b | 2262 | |
488f131b JB |
2263 | /* If we stopped due to an explicit catchpoint, then the |
2264 | (see above) call to SOLIB_ADD pulled in any symbols | |
2265 | from a newly-loaded library, if appropriate. | |
2266 | ||
2267 | We do want the inferior to stop, but not where it is | |
2268 | now, which is in the dynamic linker callback. Rather, | |
2269 | we would like it stop in the user's program, just after | |
2270 | the call that caused this catchpoint to trigger. That | |
2271 | gives the user a more useful vantage from which to | |
2272 | examine their program's state. */ | |
8fb3e588 AC |
2273 | else if (what.main_action |
2274 | == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
c906108c | 2275 | { |
488f131b JB |
2276 | /* ??rehrauer: If I could figure out how to get the |
2277 | right return PC from here, we could just set a temp | |
2278 | breakpoint and resume. I'm not sure we can without | |
2279 | cracking open the dld's shared libraries and sniffing | |
2280 | their unwind tables and text/data ranges, and that's | |
2281 | not a terribly portable notion. | |
2282 | ||
2283 | Until that time, we must step the inferior out of the | |
2284 | dld callback, and also out of the dld itself (and any | |
2285 | code or stubs in libdld.sl, such as "shl_load" and | |
2286 | friends) until we reach non-dld code. At that point, | |
2287 | we can stop stepping. */ | |
2288 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2289 | &ecs-> | |
2290 | stepping_through_solib_catchpoints); | |
2291 | ecs->stepping_through_solib_after_catch = 1; | |
2292 | ||
2293 | /* Be sure to lift all breakpoints, so the inferior does | |
2294 | actually step past this point... */ | |
2295 | ecs->another_trap = 1; | |
2296 | break; | |
c906108c | 2297 | } |
c5aa993b | 2298 | else |
c5aa993b | 2299 | { |
488f131b | 2300 | /* We want to step over this breakpoint, then keep going. */ |
c5aa993b | 2301 | ecs->another_trap = 1; |
488f131b | 2302 | break; |
c5aa993b | 2303 | } |
488f131b | 2304 | } |
488f131b | 2305 | break; |
c906108c | 2306 | |
488f131b JB |
2307 | case BPSTAT_WHAT_LAST: |
2308 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2309 | |
488f131b JB |
2310 | case BPSTAT_WHAT_KEEP_CHECKING: |
2311 | break; | |
2312 | } | |
2313 | } | |
c906108c | 2314 | |
488f131b JB |
2315 | /* We come here if we hit a breakpoint but should not |
2316 | stop for it. Possibly we also were stepping | |
2317 | and should stop for that. So fall through and | |
2318 | test for stepping. But, if not stepping, | |
2319 | do not stop. */ | |
c906108c | 2320 | |
9d1ff73f MS |
2321 | /* Are we stepping to get the inferior out of the dynamic linker's |
2322 | hook (and possibly the dld itself) after catching a shlib | |
2323 | event? */ | |
488f131b JB |
2324 | if (ecs->stepping_through_solib_after_catch) |
2325 | { | |
2326 | #if defined(SOLIB_ADD) | |
2327 | /* Have we reached our destination? If not, keep going. */ | |
2328 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2329 | { | |
527159b7 | 2330 | if (debug_infrun) |
8a9de0e4 | 2331 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n"); |
488f131b JB |
2332 | ecs->another_trap = 1; |
2333 | keep_going (ecs); | |
104c1213 | 2334 | return; |
488f131b JB |
2335 | } |
2336 | #endif | |
527159b7 | 2337 | if (debug_infrun) |
8a9de0e4 | 2338 | fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n"); |
488f131b JB |
2339 | /* Else, stop and report the catchpoint(s) whose triggering |
2340 | caused us to begin stepping. */ | |
2341 | ecs->stepping_through_solib_after_catch = 0; | |
2342 | bpstat_clear (&stop_bpstat); | |
2343 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2344 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2345 | stop_print_frame = 1; | |
2346 | stop_stepping (ecs); | |
2347 | return; | |
2348 | } | |
c906108c | 2349 | |
488f131b JB |
2350 | if (step_resume_breakpoint) |
2351 | { | |
527159b7 | 2352 | if (debug_infrun) |
8a9de0e4 | 2353 | fprintf_unfiltered (gdb_stdlog, "infrun: step-resume breakpoint\n"); |
527159b7 | 2354 | |
488f131b JB |
2355 | /* Having a step-resume breakpoint overrides anything |
2356 | else having to do with stepping commands until | |
2357 | that breakpoint is reached. */ | |
488f131b JB |
2358 | keep_going (ecs); |
2359 | return; | |
2360 | } | |
c5aa993b | 2361 | |
488f131b JB |
2362 | if (step_range_end == 0) |
2363 | { | |
527159b7 | 2364 | if (debug_infrun) |
8a9de0e4 | 2365 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 2366 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
2367 | keep_going (ecs); |
2368 | return; | |
2369 | } | |
c5aa993b | 2370 | |
488f131b | 2371 | /* If stepping through a line, keep going if still within it. |
c906108c | 2372 | |
488f131b JB |
2373 | Note that step_range_end is the address of the first instruction |
2374 | beyond the step range, and NOT the address of the last instruction | |
2375 | within it! */ | |
2376 | if (stop_pc >= step_range_start && stop_pc < step_range_end) | |
2377 | { | |
527159b7 | 2378 | if (debug_infrun) |
8a9de0e4 | 2379 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping inside range [0x%s-0x%s]\n", |
527159b7 RC |
2380 | paddr_nz (step_range_start), |
2381 | paddr_nz (step_range_end)); | |
488f131b JB |
2382 | keep_going (ecs); |
2383 | return; | |
2384 | } | |
c5aa993b | 2385 | |
488f131b | 2386 | /* We stepped out of the stepping range. */ |
c906108c | 2387 | |
488f131b JB |
2388 | /* If we are stepping at the source level and entered the runtime |
2389 | loader dynamic symbol resolution code, we keep on single stepping | |
2390 | until we exit the run time loader code and reach the callee's | |
2391 | address. */ | |
2392 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
a77053c2 MK |
2393 | #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE |
2394 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc) | |
2395 | #else | |
2396 | && in_solib_dynsym_resolve_code (stop_pc) | |
2397 | #endif | |
2398 | ) | |
488f131b | 2399 | { |
4c8c40e6 MK |
2400 | CORE_ADDR pc_after_resolver = |
2401 | gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); | |
c906108c | 2402 | |
527159b7 | 2403 | if (debug_infrun) |
8a9de0e4 | 2404 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n"); |
527159b7 | 2405 | |
488f131b JB |
2406 | if (pc_after_resolver) |
2407 | { | |
2408 | /* Set up a step-resume breakpoint at the address | |
2409 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2410 | struct symtab_and_line sr_sal; | |
fe39c653 | 2411 | init_sal (&sr_sal); |
488f131b JB |
2412 | sr_sal.pc = pc_after_resolver; |
2413 | ||
44cbf7b5 | 2414 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c5aa993b | 2415 | } |
c906108c | 2416 | |
488f131b JB |
2417 | keep_going (ecs); |
2418 | return; | |
2419 | } | |
c906108c | 2420 | |
42edda50 AC |
2421 | if (step_range_end != 1 |
2422 | && (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2423 | || step_over_calls == STEP_OVER_ALL) | |
2424 | && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME) | |
488f131b | 2425 | { |
527159b7 | 2426 | if (debug_infrun) |
8a9de0e4 | 2427 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n"); |
42edda50 | 2428 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
2429 | a signal trampoline (either by a signal being delivered or by |
2430 | the signal handler returning). Just single-step until the | |
2431 | inferior leaves the trampoline (either by calling the handler | |
2432 | or returning). */ | |
488f131b JB |
2433 | keep_going (ecs); |
2434 | return; | |
2435 | } | |
c906108c | 2436 | |
c17eaafe DJ |
2437 | /* Check for subroutine calls. The check for the current frame |
2438 | equalling the step ID is not necessary - the check of the | |
2439 | previous frame's ID is sufficient - but it is a common case and | |
2440 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
2441 | |
2442 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
2443 | being equal, so to get into this block, both the current and | |
2444 | previous frame must have valid frame IDs. */ | |
c17eaafe DJ |
2445 | if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id) |
2446 | && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id)) | |
488f131b | 2447 | { |
95918acb | 2448 | CORE_ADDR real_stop_pc; |
8fb3e588 | 2449 | |
527159b7 | 2450 | if (debug_infrun) |
8a9de0e4 | 2451 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 2452 | |
95918acb AC |
2453 | if ((step_over_calls == STEP_OVER_NONE) |
2454 | || ((step_range_end == 1) | |
2455 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
2456 | { | |
2457 | /* I presume that step_over_calls is only 0 when we're | |
2458 | supposed to be stepping at the assembly language level | |
2459 | ("stepi"). Just stop. */ | |
2460 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
2461 | thought it was a subroutine call but it was not. Stop as | |
2462 | well. FENN */ | |
2463 | stop_step = 1; | |
2464 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2465 | stop_stepping (ecs); | |
2466 | return; | |
2467 | } | |
8fb3e588 | 2468 | |
8567c30f AC |
2469 | if (step_over_calls == STEP_OVER_ALL) |
2470 | { | |
2471 | /* We're doing a "next", set a breakpoint at callee's return | |
2472 | address (the address at which the caller will | |
2473 | resume). */ | |
14e60db5 | 2474 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
8567c30f AC |
2475 | keep_going (ecs); |
2476 | return; | |
2477 | } | |
a53c66de | 2478 | |
95918acb | 2479 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
2480 | calling routine and the real function), locate the real |
2481 | function. That's what tells us (a) whether we want to step | |
2482 | into it at all, and (b) what prologue we want to run to the | |
2483 | end of, if we do step into it. */ | |
95918acb AC |
2484 | real_stop_pc = skip_language_trampoline (stop_pc); |
2485 | if (real_stop_pc == 0) | |
2486 | real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2487 | if (real_stop_pc != 0) | |
2488 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 2489 | |
a77053c2 MK |
2490 | if ( |
2491 | #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
2492 | IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start) | |
2493 | #else | |
2494 | in_solib_dynsym_resolve_code (ecs->stop_func_start) | |
2495 | #endif | |
2496 | ) | |
1b2bfbb9 RC |
2497 | { |
2498 | struct symtab_and_line sr_sal; | |
2499 | init_sal (&sr_sal); | |
2500 | sr_sal.pc = ecs->stop_func_start; | |
2501 | ||
44cbf7b5 | 2502 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
8fb3e588 AC |
2503 | keep_going (ecs); |
2504 | return; | |
1b2bfbb9 RC |
2505 | } |
2506 | ||
95918acb | 2507 | /* If we have line number information for the function we are |
8fb3e588 | 2508 | thinking of stepping into, step into it. |
95918acb | 2509 | |
8fb3e588 AC |
2510 | If there are several symtabs at that PC (e.g. with include |
2511 | files), just want to know whether *any* of them have line | |
2512 | numbers. find_pc_line handles this. */ | |
95918acb AC |
2513 | { |
2514 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 2515 | |
95918acb AC |
2516 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2517 | if (tmp_sal.line != 0) | |
2518 | { | |
2519 | step_into_function (ecs); | |
2520 | return; | |
2521 | } | |
2522 | } | |
2523 | ||
2524 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
2525 | set, we stop the step so that the user has a chance to switch |
2526 | in assembly mode. */ | |
95918acb AC |
2527 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) |
2528 | { | |
2529 | stop_step = 1; | |
2530 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2531 | stop_stepping (ecs); | |
2532 | return; | |
2533 | } | |
2534 | ||
2535 | /* Set a breakpoint at callee's return address (the address at | |
8fb3e588 | 2536 | which the caller will resume). */ |
14e60db5 | 2537 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
95918acb | 2538 | keep_going (ecs); |
488f131b | 2539 | return; |
488f131b | 2540 | } |
c906108c | 2541 | |
488f131b JB |
2542 | /* If we're in the return path from a shared library trampoline, |
2543 | we want to proceed through the trampoline when stepping. */ | |
2544 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2545 | { | |
488f131b | 2546 | /* Determine where this trampoline returns. */ |
5cf4d23a | 2547 | CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); |
c906108c | 2548 | |
527159b7 | 2549 | if (debug_infrun) |
8a9de0e4 | 2550 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n"); |
527159b7 | 2551 | |
488f131b | 2552 | /* Only proceed through if we know where it's going. */ |
d764a824 | 2553 | if (real_stop_pc) |
488f131b JB |
2554 | { |
2555 | /* And put the step-breakpoint there and go until there. */ | |
2556 | struct symtab_and_line sr_sal; | |
2557 | ||
fe39c653 | 2558 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 2559 | sr_sal.pc = real_stop_pc; |
488f131b | 2560 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
44cbf7b5 AC |
2561 | |
2562 | /* Do not specify what the fp should be when we stop since | |
2563 | on some machines the prologue is where the new fp value | |
2564 | is established. */ | |
2565 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); | |
c906108c | 2566 | |
488f131b JB |
2567 | /* Restart without fiddling with the step ranges or |
2568 | other state. */ | |
2569 | keep_going (ecs); | |
2570 | return; | |
2571 | } | |
2572 | } | |
c906108c | 2573 | |
7ed0fe66 DJ |
2574 | ecs->sal = find_pc_line (stop_pc, 0); |
2575 | ||
1b2bfbb9 RC |
2576 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
2577 | the trampoline processing logic, however, there are some trampolines | |
2578 | that have no names, so we should do trampoline handling first. */ | |
2579 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
7ed0fe66 DJ |
2580 | && ecs->stop_func_name == NULL |
2581 | && ecs->sal.line == 0) | |
1b2bfbb9 | 2582 | { |
527159b7 | 2583 | if (debug_infrun) |
8a9de0e4 | 2584 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n"); |
527159b7 | 2585 | |
1b2bfbb9 | 2586 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
2587 | undebuggable function (where there is no debugging information |
2588 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
2589 | inferior stopped). Since we want to skip this kind of code, |
2590 | we keep going until the inferior returns from this | |
14e60db5 DJ |
2591 | function - unless the user has asked us not to (via |
2592 | set step-mode) or we no longer know how to get back | |
2593 | to the call site. */ | |
2594 | if (step_stop_if_no_debug | |
2595 | || !frame_id_p (frame_unwind_id (get_current_frame ()))) | |
1b2bfbb9 RC |
2596 | { |
2597 | /* If we have no line number and the step-stop-if-no-debug | |
2598 | is set, we stop the step so that the user has a chance to | |
2599 | switch in assembly mode. */ | |
2600 | stop_step = 1; | |
2601 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2602 | stop_stepping (ecs); | |
2603 | return; | |
2604 | } | |
2605 | else | |
2606 | { | |
2607 | /* Set a breakpoint at callee's return address (the address | |
2608 | at which the caller will resume). */ | |
14e60db5 | 2609 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
1b2bfbb9 RC |
2610 | keep_going (ecs); |
2611 | return; | |
2612 | } | |
2613 | } | |
2614 | ||
2615 | if (step_range_end == 1) | |
2616 | { | |
2617 | /* It is stepi or nexti. We always want to stop stepping after | |
2618 | one instruction. */ | |
527159b7 | 2619 | if (debug_infrun) |
8a9de0e4 | 2620 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
1b2bfbb9 RC |
2621 | stop_step = 1; |
2622 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2623 | stop_stepping (ecs); | |
2624 | return; | |
2625 | } | |
2626 | ||
488f131b JB |
2627 | if (ecs->sal.line == 0) |
2628 | { | |
2629 | /* We have no line number information. That means to stop | |
2630 | stepping (does this always happen right after one instruction, | |
2631 | when we do "s" in a function with no line numbers, | |
2632 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 2633 | if (debug_infrun) |
8a9de0e4 | 2634 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
488f131b JB |
2635 | stop_step = 1; |
2636 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2637 | stop_stepping (ecs); | |
2638 | return; | |
2639 | } | |
c906108c | 2640 | |
488f131b JB |
2641 | if ((stop_pc == ecs->sal.pc) |
2642 | && (ecs->current_line != ecs->sal.line | |
2643 | || ecs->current_symtab != ecs->sal.symtab)) | |
2644 | { | |
2645 | /* We are at the start of a different line. So stop. Note that | |
2646 | we don't stop if we step into the middle of a different line. | |
2647 | That is said to make things like for (;;) statements work | |
2648 | better. */ | |
527159b7 | 2649 | if (debug_infrun) |
8a9de0e4 | 2650 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n"); |
488f131b JB |
2651 | stop_step = 1; |
2652 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2653 | stop_stepping (ecs); | |
2654 | return; | |
2655 | } | |
c906108c | 2656 | |
488f131b | 2657 | /* We aren't done stepping. |
c906108c | 2658 | |
488f131b JB |
2659 | Optimize by setting the stepping range to the line. |
2660 | (We might not be in the original line, but if we entered a | |
2661 | new line in mid-statement, we continue stepping. This makes | |
2662 | things like for(;;) statements work better.) */ | |
c906108c | 2663 | |
488f131b | 2664 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
c5aa993b | 2665 | { |
488f131b JB |
2666 | /* If this is the last line of the function, don't keep stepping |
2667 | (it would probably step us out of the function). | |
2668 | This is particularly necessary for a one-line function, | |
2669 | in which after skipping the prologue we better stop even though | |
2670 | we will be in mid-line. */ | |
527159b7 | 2671 | if (debug_infrun) |
8a9de0e4 | 2672 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different function\n"); |
488f131b JB |
2673 | stop_step = 1; |
2674 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2675 | stop_stepping (ecs); | |
2676 | return; | |
c5aa993b | 2677 | } |
488f131b JB |
2678 | step_range_start = ecs->sal.pc; |
2679 | step_range_end = ecs->sal.end; | |
aa0cd9c1 | 2680 | step_frame_id = get_frame_id (get_current_frame ()); |
488f131b JB |
2681 | ecs->current_line = ecs->sal.line; |
2682 | ecs->current_symtab = ecs->sal.symtab; | |
2683 | ||
aa0cd9c1 AC |
2684 | /* In the case where we just stepped out of a function into the |
2685 | middle of a line of the caller, continue stepping, but | |
2686 | step_frame_id must be modified to current frame */ | |
65815ea1 AC |
2687 | #if 0 |
2688 | /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too | |
2689 | generous. It will trigger on things like a step into a frameless | |
2690 | stackless leaf function. I think the logic should instead look | |
2691 | at the unwound frame ID has that should give a more robust | |
2692 | indication of what happened. */ | |
8fb3e588 AC |
2693 | if (step - ID == current - ID) |
2694 | still stepping in same function; | |
2695 | else if (step - ID == unwind (current - ID)) | |
2696 | stepped into a function; | |
2697 | else | |
2698 | stepped out of a function; | |
2699 | /* Of course this assumes that the frame ID unwind code is robust | |
2700 | and we're willing to introduce frame unwind logic into this | |
2701 | function. Fortunately, those days are nearly upon us. */ | |
65815ea1 | 2702 | #endif |
488f131b | 2703 | { |
aa0cd9c1 AC |
2704 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
2705 | if (!(frame_id_inner (current_frame, step_frame_id))) | |
2706 | step_frame_id = current_frame; | |
488f131b | 2707 | } |
c906108c | 2708 | |
527159b7 | 2709 | if (debug_infrun) |
8a9de0e4 | 2710 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 2711 | keep_going (ecs); |
104c1213 JM |
2712 | } |
2713 | ||
2714 | /* Are we in the middle of stepping? */ | |
2715 | ||
2716 | static int | |
2717 | currently_stepping (struct execution_control_state *ecs) | |
2718 | { | |
d303a6c7 | 2719 | return ((!ecs->handling_longjmp |
104c1213 JM |
2720 | && ((step_range_end && step_resume_breakpoint == NULL) |
2721 | || trap_expected)) | |
2722 | || ecs->stepping_through_solib_after_catch | |
2723 | || bpstat_should_step ()); | |
2724 | } | |
c906108c | 2725 | |
c2c6d25f JM |
2726 | /* Subroutine call with source code we should not step over. Do step |
2727 | to the first line of code in it. */ | |
2728 | ||
2729 | static void | |
2730 | step_into_function (struct execution_control_state *ecs) | |
2731 | { | |
2732 | struct symtab *s; | |
2733 | struct symtab_and_line sr_sal; | |
2734 | ||
2735 | s = find_pc_symtab (stop_pc); | |
2736 | if (s && s->language != language_asm) | |
2737 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
2738 | ||
2739 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2740 | /* Use the step_resume_break to step until the end of the prologue, | |
2741 | even if that involves jumps (as it seems to on the vax under | |
2742 | 4.2). */ | |
2743 | /* If the prologue ends in the middle of a source line, continue to | |
2744 | the end of that source line (if it is still within the function). | |
2745 | Otherwise, just go to end of prologue. */ | |
c2c6d25f JM |
2746 | if (ecs->sal.end |
2747 | && ecs->sal.pc != ecs->stop_func_start | |
2748 | && ecs->sal.end < ecs->stop_func_end) | |
2749 | ecs->stop_func_start = ecs->sal.end; | |
c2c6d25f | 2750 | |
2dbd5e30 KB |
2751 | /* Architectures which require breakpoint adjustment might not be able |
2752 | to place a breakpoint at the computed address. If so, the test | |
2753 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
2754 | ecs->stop_func_start to an address at which a breakpoint may be | |
2755 | legitimately placed. | |
8fb3e588 | 2756 | |
2dbd5e30 KB |
2757 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
2758 | made, GDB will enter an infinite loop when stepping through | |
2759 | optimized code consisting of VLIW instructions which contain | |
2760 | subinstructions corresponding to different source lines. On | |
2761 | FR-V, it's not permitted to place a breakpoint on any but the | |
2762 | first subinstruction of a VLIW instruction. When a breakpoint is | |
2763 | set, GDB will adjust the breakpoint address to the beginning of | |
2764 | the VLIW instruction. Thus, we need to make the corresponding | |
2765 | adjustment here when computing the stop address. */ | |
8fb3e588 | 2766 | |
2dbd5e30 KB |
2767 | if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) |
2768 | { | |
2769 | ecs->stop_func_start | |
2770 | = gdbarch_adjust_breakpoint_address (current_gdbarch, | |
8fb3e588 | 2771 | ecs->stop_func_start); |
2dbd5e30 KB |
2772 | } |
2773 | ||
c2c6d25f JM |
2774 | if (ecs->stop_func_start == stop_pc) |
2775 | { | |
2776 | /* We are already there: stop now. */ | |
2777 | stop_step = 1; | |
488f131b | 2778 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2779 | stop_stepping (ecs); |
2780 | return; | |
2781 | } | |
2782 | else | |
2783 | { | |
2784 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 2785 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
2786 | sr_sal.pc = ecs->stop_func_start; |
2787 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
44cbf7b5 | 2788 | |
c2c6d25f | 2789 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
2790 | some machines the prologue is where the new fp value is |
2791 | established. */ | |
44cbf7b5 | 2792 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c2c6d25f JM |
2793 | |
2794 | /* And make sure stepping stops right away then. */ | |
2795 | step_range_end = step_range_start; | |
2796 | } | |
2797 | keep_going (ecs); | |
2798 | } | |
d4f3574e | 2799 | |
44cbf7b5 AC |
2800 | /* Insert a "step resume breakpoint" at SR_SAL with frame ID SR_ID. |
2801 | This is used to both functions and to skip over code. */ | |
2802 | ||
2803 | static void | |
2804 | insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, | |
2805 | struct frame_id sr_id) | |
2806 | { | |
2807 | /* There should never be more than one step-resume breakpoint per | |
2808 | thread, so we should never be setting a new | |
2809 | step_resume_breakpoint when one is already active. */ | |
2810 | gdb_assert (step_resume_breakpoint == NULL); | |
2811 | step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id, | |
2812 | bp_step_resume); | |
2813 | if (breakpoints_inserted) | |
2814 | insert_breakpoints (); | |
2815 | } | |
7ce450bd | 2816 | |
14e60db5 DJ |
2817 | /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used |
2818 | to skip a potential signal handler. | |
7ce450bd | 2819 | |
14e60db5 DJ |
2820 | This is called with the interrupted function's frame. The signal |
2821 | handler, when it returns, will resume the interrupted function at | |
2822 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
2823 | |
2824 | static void | |
44cbf7b5 | 2825 | insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
2826 | { |
2827 | struct symtab_and_line sr_sal; | |
2828 | ||
d303a6c7 AC |
2829 | init_sal (&sr_sal); /* initialize to zeros */ |
2830 | ||
7ce450bd | 2831 | sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (return_frame)); |
d303a6c7 AC |
2832 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2833 | ||
44cbf7b5 | 2834 | insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame)); |
d303a6c7 AC |
2835 | } |
2836 | ||
14e60db5 DJ |
2837 | /* Similar to insert_step_resume_breakpoint_at_frame, except |
2838 | but a breakpoint at the previous frame's PC. This is used to | |
2839 | skip a function after stepping into it (for "next" or if the called | |
2840 | function has no debugging information). | |
2841 | ||
2842 | The current function has almost always been reached by single | |
2843 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
2844 | current function, and the breakpoint will be set at the caller's | |
2845 | resume address. | |
2846 | ||
2847 | This is a separate function rather than reusing | |
2848 | insert_step_resume_breakpoint_at_frame in order to avoid | |
2849 | get_prev_frame, which may stop prematurely (see the implementation | |
2850 | of frame_unwind_id for an example). */ | |
2851 | ||
2852 | static void | |
2853 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
2854 | { | |
2855 | struct symtab_and_line sr_sal; | |
2856 | ||
2857 | /* We shouldn't have gotten here if we don't know where the call site | |
2858 | is. */ | |
2859 | gdb_assert (frame_id_p (frame_unwind_id (next_frame))); | |
2860 | ||
2861 | init_sal (&sr_sal); /* initialize to zeros */ | |
2862 | ||
2863 | sr_sal.pc = ADDR_BITS_REMOVE (frame_pc_unwind (next_frame)); | |
2864 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2865 | ||
2866 | insert_step_resume_breakpoint_at_sal (sr_sal, frame_unwind_id (next_frame)); | |
2867 | } | |
2868 | ||
104c1213 JM |
2869 | static void |
2870 | stop_stepping (struct execution_control_state *ecs) | |
2871 | { | |
527159b7 | 2872 | if (debug_infrun) |
8a9de0e4 | 2873 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
527159b7 | 2874 | |
cd0fc7c3 SS |
2875 | /* Let callers know we don't want to wait for the inferior anymore. */ |
2876 | ecs->wait_some_more = 0; | |
2877 | } | |
2878 | ||
d4f3574e SS |
2879 | /* This function handles various cases where we need to continue |
2880 | waiting for the inferior. */ | |
2881 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
2882 | ||
2883 | static void | |
2884 | keep_going (struct execution_control_state *ecs) | |
2885 | { | |
d4f3574e | 2886 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 2887 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e | 2888 | |
d4f3574e SS |
2889 | /* If we did not do break;, it means we should keep running the |
2890 | inferior and not return to debugger. */ | |
2891 | ||
2892 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
2893 | { | |
2894 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
2895 | the inferior, else we'd have done a break above) and we |
2896 | haven't yet gotten our trap. Simply continue. */ | |
d4f3574e SS |
2897 | resume (currently_stepping (ecs), stop_signal); |
2898 | } | |
2899 | else | |
2900 | { | |
2901 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
2902 | anyway (the user asked that this signal be passed to the |
2903 | child) | |
2904 | -- or -- | |
2905 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2906 | decided we should resume from it. | |
d4f3574e | 2907 | |
68f53502 | 2908 | We're going to run this baby now! */ |
d4f3574e | 2909 | |
68f53502 | 2910 | if (!breakpoints_inserted && !ecs->another_trap) |
d4f3574e SS |
2911 | { |
2912 | breakpoints_failed = insert_breakpoints (); | |
2913 | if (breakpoints_failed) | |
2914 | { | |
2915 | stop_stepping (ecs); | |
2916 | return; | |
2917 | } | |
2918 | breakpoints_inserted = 1; | |
2919 | } | |
2920 | ||
2921 | trap_expected = ecs->another_trap; | |
2922 | ||
2923 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
2924 | specifies that such a signal should be delivered to the |
2925 | target program). | |
2926 | ||
2927 | Typically, this would occure when a user is debugging a | |
2928 | target monitor on a simulator: the target monitor sets a | |
2929 | breakpoint; the simulator encounters this break-point and | |
2930 | halts the simulation handing control to GDB; GDB, noteing | |
2931 | that the break-point isn't valid, returns control back to the | |
2932 | simulator; the simulator then delivers the hardware | |
2933 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
2934 | ||
2935 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
2936 | stop_signal = TARGET_SIGNAL_0; |
2937 | ||
d4f3574e SS |
2938 | |
2939 | resume (currently_stepping (ecs), stop_signal); | |
2940 | } | |
2941 | ||
488f131b | 2942 | prepare_to_wait (ecs); |
d4f3574e SS |
2943 | } |
2944 | ||
104c1213 JM |
2945 | /* This function normally comes after a resume, before |
2946 | handle_inferior_event exits. It takes care of any last bits of | |
2947 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 2948 | |
104c1213 JM |
2949 | static void |
2950 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 2951 | { |
527159b7 | 2952 | if (debug_infrun) |
8a9de0e4 | 2953 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 JM |
2954 | if (ecs->infwait_state == infwait_normal_state) |
2955 | { | |
2956 | overlay_cache_invalid = 1; | |
2957 | ||
2958 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
2959 | target_wait because they can be loaded from the target while |
2960 | in target_wait. This makes remote debugging a bit more | |
2961 | efficient for those targets that provide critical registers | |
2962 | as part of their normal status mechanism. */ | |
104c1213 JM |
2963 | |
2964 | registers_changed (); | |
39f77062 | 2965 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
2966 | ecs->wp = &(ecs->ws); |
2967 | } | |
2968 | /* This is the old end of the while loop. Let everybody know we | |
2969 | want to wait for the inferior some more and get called again | |
2970 | soon. */ | |
2971 | ecs->wait_some_more = 1; | |
c906108c | 2972 | } |
11cf8741 JM |
2973 | |
2974 | /* Print why the inferior has stopped. We always print something when | |
2975 | the inferior exits, or receives a signal. The rest of the cases are | |
2976 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
2977 | there should be a call to this function from handle_inferior_event() | |
2978 | each time stop_stepping() is called.*/ | |
2979 | static void | |
2980 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
2981 | { | |
2982 | switch (stop_reason) | |
2983 | { | |
11cf8741 JM |
2984 | case END_STEPPING_RANGE: |
2985 | /* We are done with a step/next/si/ni command. */ | |
2986 | /* For now print nothing. */ | |
fb40c209 | 2987 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 2988 | operation for n > 1 */ |
fb40c209 | 2989 | if (!step_multi || !stop_step) |
9dc5e2a9 | 2990 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
2991 | ui_out_field_string |
2992 | (uiout, "reason", | |
2993 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
11cf8741 | 2994 | break; |
11cf8741 JM |
2995 | case SIGNAL_EXITED: |
2996 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 2997 | annotate_signalled (); |
9dc5e2a9 | 2998 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
2999 | ui_out_field_string |
3000 | (uiout, "reason", | |
3001 | async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8b93c638 JM |
3002 | ui_out_text (uiout, "\nProgram terminated with signal "); |
3003 | annotate_signal_name (); | |
488f131b JB |
3004 | ui_out_field_string (uiout, "signal-name", |
3005 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
3006 | annotate_signal_name_end (); |
3007 | ui_out_text (uiout, ", "); | |
3008 | annotate_signal_string (); | |
488f131b JB |
3009 | ui_out_field_string (uiout, "signal-meaning", |
3010 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
3011 | annotate_signal_string_end (); |
3012 | ui_out_text (uiout, ".\n"); | |
3013 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
3014 | break; |
3015 | case EXITED: | |
3016 | /* The inferior program is finished. */ | |
8b93c638 JM |
3017 | annotate_exited (stop_info); |
3018 | if (stop_info) | |
3019 | { | |
9dc5e2a9 | 3020 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3021 | ui_out_field_string (uiout, "reason", |
3022 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
8b93c638 | 3023 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
3024 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
3025 | (unsigned int) stop_info); | |
8b93c638 JM |
3026 | ui_out_text (uiout, ".\n"); |
3027 | } | |
3028 | else | |
3029 | { | |
9dc5e2a9 | 3030 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3031 | ui_out_field_string |
3032 | (uiout, "reason", | |
3033 | async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
8b93c638 JM |
3034 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
3035 | } | |
f17517ea AS |
3036 | /* Support the --return-child-result option. */ |
3037 | return_child_result_value = stop_info; | |
11cf8741 JM |
3038 | break; |
3039 | case SIGNAL_RECEIVED: | |
3040 | /* Signal received. The signal table tells us to print about | |
3041 | it. */ | |
8b93c638 JM |
3042 | annotate_signal (); |
3043 | ui_out_text (uiout, "\nProgram received signal "); | |
3044 | annotate_signal_name (); | |
84c6c83c | 3045 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3046 | ui_out_field_string |
3047 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b JB |
3048 | ui_out_field_string (uiout, "signal-name", |
3049 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
3050 | annotate_signal_name_end (); |
3051 | ui_out_text (uiout, ", "); | |
3052 | annotate_signal_string (); | |
488f131b JB |
3053 | ui_out_field_string (uiout, "signal-meaning", |
3054 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
3055 | annotate_signal_string_end (); |
3056 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
3057 | break; |
3058 | default: | |
8e65ff28 | 3059 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 3060 | _("print_stop_reason: unrecognized enum value")); |
11cf8741 JM |
3061 | break; |
3062 | } | |
3063 | } | |
c906108c | 3064 | \f |
43ff13b4 | 3065 | |
c906108c SS |
3066 | /* Here to return control to GDB when the inferior stops for real. |
3067 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
3068 | ||
3069 | STOP_PRINT_FRAME nonzero means print the executing frame | |
3070 | (pc, function, args, file, line number and line text). | |
3071 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
3072 | attempting to insert breakpoints. */ | |
3073 | ||
3074 | void | |
96baa820 | 3075 | normal_stop (void) |
c906108c | 3076 | { |
73b65bb0 DJ |
3077 | struct target_waitstatus last; |
3078 | ptid_t last_ptid; | |
3079 | ||
3080 | get_last_target_status (&last_ptid, &last); | |
3081 | ||
c906108c SS |
3082 | /* As with the notification of thread events, we want to delay |
3083 | notifying the user that we've switched thread context until | |
3084 | the inferior actually stops. | |
3085 | ||
73b65bb0 DJ |
3086 | There's no point in saying anything if the inferior has exited. |
3087 | Note that SIGNALLED here means "exited with a signal", not | |
3088 | "received a signal". */ | |
488f131b | 3089 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
73b65bb0 DJ |
3090 | && target_has_execution |
3091 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
3092 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
3093 | { |
3094 | target_terminal_ours_for_output (); | |
a3f17187 | 3095 | printf_filtered (_("[Switching to %s]\n"), |
39f77062 KB |
3096 | target_pid_or_tid_to_str (inferior_ptid)); |
3097 | previous_inferior_ptid = inferior_ptid; | |
c906108c | 3098 | } |
c906108c | 3099 | |
4fa8626c | 3100 | /* NOTE drow/2004-01-17: Is this still necessary? */ |
c906108c SS |
3101 | /* Make sure that the current_frame's pc is correct. This |
3102 | is a correction for setting up the frame info before doing | |
3103 | DECR_PC_AFTER_BREAK */ | |
b87efeee AC |
3104 | if (target_has_execution) |
3105 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to | |
3106 | DECR_PC_AFTER_BREAK, the program counter can change. Ask the | |
3107 | frame code to check for this and sort out any resultant mess. | |
3108 | DECR_PC_AFTER_BREAK needs to just go away. */ | |
2f107107 | 3109 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
c906108c | 3110 | |
c906108c SS |
3111 | if (target_has_execution && breakpoints_inserted) |
3112 | { | |
3113 | if (remove_breakpoints ()) | |
3114 | { | |
3115 | target_terminal_ours_for_output (); | |
a3f17187 AC |
3116 | printf_filtered (_("\ |
3117 | Cannot remove breakpoints because program is no longer writable.\n\ | |
3118 | It might be running in another process.\n\ | |
3119 | Further execution is probably impossible.\n")); | |
c906108c SS |
3120 | } |
3121 | } | |
3122 | breakpoints_inserted = 0; | |
3123 | ||
3124 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3125 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3126 | ||
3127 | breakpoint_auto_delete (stop_bpstat); | |
3128 | ||
3129 | /* If an auto-display called a function and that got a signal, | |
3130 | delete that auto-display to avoid an infinite recursion. */ | |
3131 | ||
3132 | if (stopped_by_random_signal) | |
3133 | disable_current_display (); | |
3134 | ||
3135 | /* Don't print a message if in the middle of doing a "step n" | |
3136 | operation for n > 1 */ | |
3137 | if (step_multi && stop_step) | |
3138 | goto done; | |
3139 | ||
3140 | target_terminal_ours (); | |
3141 | ||
7abfe014 DJ |
3142 | /* Set the current source location. This will also happen if we |
3143 | display the frame below, but the current SAL will be incorrect | |
3144 | during a user hook-stop function. */ | |
3145 | if (target_has_stack && !stop_stack_dummy) | |
3146 | set_current_sal_from_frame (get_current_frame (), 1); | |
3147 | ||
5913bcb0 AC |
3148 | /* Look up the hook_stop and run it (CLI internally handles problem |
3149 | of stop_command's pre-hook not existing). */ | |
3150 | if (stop_command) | |
3151 | catch_errors (hook_stop_stub, stop_command, | |
3152 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
3153 | |
3154 | if (!target_has_stack) | |
3155 | { | |
3156 | ||
3157 | goto done; | |
3158 | } | |
3159 | ||
3160 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3161 | and current location is based on that. | |
3162 | Don't do this on return from a stack dummy routine, | |
3163 | or if the program has exited. */ | |
3164 | ||
3165 | if (!stop_stack_dummy) | |
3166 | { | |
0f7d239c | 3167 | select_frame (get_current_frame ()); |
c906108c SS |
3168 | |
3169 | /* Print current location without a level number, if | |
c5aa993b JM |
3170 | we have changed functions or hit a breakpoint. |
3171 | Print source line if we have one. | |
3172 | bpstat_print() contains the logic deciding in detail | |
3173 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3174 | |
206415a3 | 3175 | if (stop_print_frame) |
c906108c SS |
3176 | { |
3177 | int bpstat_ret; | |
3178 | int source_flag; | |
917317f4 | 3179 | int do_frame_printing = 1; |
c906108c SS |
3180 | |
3181 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3182 | switch (bpstat_ret) |
3183 | { | |
3184 | case PRINT_UNKNOWN: | |
aa0cd9c1 | 3185 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
3186 | (or should) carry around the function and does (or |
3187 | should) use that when doing a frame comparison. */ | |
917317f4 | 3188 | if (stop_step |
aa0cd9c1 AC |
3189 | && frame_id_eq (step_frame_id, |
3190 | get_frame_id (get_current_frame ())) | |
917317f4 | 3191 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3192 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3193 | else |
488f131b | 3194 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3195 | break; |
3196 | case PRINT_SRC_AND_LOC: | |
488f131b | 3197 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3198 | break; |
3199 | case PRINT_SRC_ONLY: | |
c5394b80 | 3200 | source_flag = SRC_LINE; |
917317f4 JM |
3201 | break; |
3202 | case PRINT_NOTHING: | |
488f131b | 3203 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3204 | do_frame_printing = 0; |
3205 | break; | |
3206 | default: | |
e2e0b3e5 | 3207 | internal_error (__FILE__, __LINE__, _("Unknown value.")); |
917317f4 | 3208 | } |
fb40c209 | 3209 | /* For mi, have the same behavior every time we stop: |
488f131b | 3210 | print everything but the source line. */ |
9dc5e2a9 | 3211 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3212 | source_flag = LOC_AND_ADDRESS; |
c906108c | 3213 | |
9dc5e2a9 | 3214 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 | 3215 | ui_out_field_int (uiout, "thread-id", |
488f131b | 3216 | pid_to_thread_id (inferior_ptid)); |
c906108c SS |
3217 | /* The behavior of this routine with respect to the source |
3218 | flag is: | |
c5394b80 JM |
3219 | SRC_LINE: Print only source line |
3220 | LOCATION: Print only location | |
3221 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3222 | if (do_frame_printing) |
b04f3ab4 | 3223 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
3224 | |
3225 | /* Display the auto-display expressions. */ | |
3226 | do_displays (); | |
3227 | } | |
3228 | } | |
3229 | ||
3230 | /* Save the function value return registers, if we care. | |
3231 | We might be about to restore their previous contents. */ | |
3232 | if (proceed_to_finish) | |
72cec141 AC |
3233 | /* NB: The copy goes through to the target picking up the value of |
3234 | all the registers. */ | |
3235 | regcache_cpy (stop_registers, current_regcache); | |
c906108c SS |
3236 | |
3237 | if (stop_stack_dummy) | |
3238 | { | |
dbe9fe58 AC |
3239 | /* Pop the empty frame that contains the stack dummy. POP_FRAME |
3240 | ends with a setting of the current frame, so we can use that | |
3241 | next. */ | |
3242 | frame_pop (get_current_frame ()); | |
c906108c | 3243 | /* Set stop_pc to what it was before we called the function. |
c5aa993b JM |
3244 | Can't rely on restore_inferior_status because that only gets |
3245 | called if we don't stop in the called function. */ | |
c906108c | 3246 | stop_pc = read_pc (); |
0f7d239c | 3247 | select_frame (get_current_frame ()); |
c906108c SS |
3248 | } |
3249 | ||
c906108c SS |
3250 | done: |
3251 | annotate_stopped (); | |
7a464420 | 3252 | observer_notify_normal_stop (stop_bpstat); |
c906108c SS |
3253 | } |
3254 | ||
3255 | static int | |
96baa820 | 3256 | hook_stop_stub (void *cmd) |
c906108c | 3257 | { |
5913bcb0 | 3258 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3259 | return (0); |
3260 | } | |
3261 | \f | |
c5aa993b | 3262 | int |
96baa820 | 3263 | signal_stop_state (int signo) |
c906108c SS |
3264 | { |
3265 | return signal_stop[signo]; | |
3266 | } | |
3267 | ||
c5aa993b | 3268 | int |
96baa820 | 3269 | signal_print_state (int signo) |
c906108c SS |
3270 | { |
3271 | return signal_print[signo]; | |
3272 | } | |
3273 | ||
c5aa993b | 3274 | int |
96baa820 | 3275 | signal_pass_state (int signo) |
c906108c SS |
3276 | { |
3277 | return signal_program[signo]; | |
3278 | } | |
3279 | ||
488f131b | 3280 | int |
7bda5e4a | 3281 | signal_stop_update (int signo, int state) |
d4f3574e SS |
3282 | { |
3283 | int ret = signal_stop[signo]; | |
3284 | signal_stop[signo] = state; | |
3285 | return ret; | |
3286 | } | |
3287 | ||
488f131b | 3288 | int |
7bda5e4a | 3289 | signal_print_update (int signo, int state) |
d4f3574e SS |
3290 | { |
3291 | int ret = signal_print[signo]; | |
3292 | signal_print[signo] = state; | |
3293 | return ret; | |
3294 | } | |
3295 | ||
488f131b | 3296 | int |
7bda5e4a | 3297 | signal_pass_update (int signo, int state) |
d4f3574e SS |
3298 | { |
3299 | int ret = signal_program[signo]; | |
3300 | signal_program[signo] = state; | |
3301 | return ret; | |
3302 | } | |
3303 | ||
c906108c | 3304 | static void |
96baa820 | 3305 | sig_print_header (void) |
c906108c | 3306 | { |
a3f17187 AC |
3307 | printf_filtered (_("\ |
3308 | Signal Stop\tPrint\tPass to program\tDescription\n")); | |
c906108c SS |
3309 | } |
3310 | ||
3311 | static void | |
96baa820 | 3312 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3313 | { |
3314 | char *name = target_signal_to_name (oursig); | |
3315 | int name_padding = 13 - strlen (name); | |
96baa820 | 3316 | |
c906108c SS |
3317 | if (name_padding <= 0) |
3318 | name_padding = 0; | |
3319 | ||
3320 | printf_filtered ("%s", name); | |
488f131b | 3321 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
3322 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3323 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3324 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3325 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3326 | } | |
3327 | ||
3328 | /* Specify how various signals in the inferior should be handled. */ | |
3329 | ||
3330 | static void | |
96baa820 | 3331 | handle_command (char *args, int from_tty) |
c906108c SS |
3332 | { |
3333 | char **argv; | |
3334 | int digits, wordlen; | |
3335 | int sigfirst, signum, siglast; | |
3336 | enum target_signal oursig; | |
3337 | int allsigs; | |
3338 | int nsigs; | |
3339 | unsigned char *sigs; | |
3340 | struct cleanup *old_chain; | |
3341 | ||
3342 | if (args == NULL) | |
3343 | { | |
e2e0b3e5 | 3344 | error_no_arg (_("signal to handle")); |
c906108c SS |
3345 | } |
3346 | ||
3347 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3348 | ||
3349 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3350 | sigs = (unsigned char *) alloca (nsigs); | |
3351 | memset (sigs, 0, nsigs); | |
3352 | ||
3353 | /* Break the command line up into args. */ | |
3354 | ||
3355 | argv = buildargv (args); | |
3356 | if (argv == NULL) | |
3357 | { | |
3358 | nomem (0); | |
3359 | } | |
7a292a7a | 3360 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3361 | |
3362 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3363 | actions. Signal numbers and signal names may be interspersed with | |
3364 | actions, with the actions being performed for all signals cumulatively | |
3365 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3366 | ||
3367 | while (*argv != NULL) | |
3368 | { | |
3369 | wordlen = strlen (*argv); | |
3370 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3371 | {; | |
3372 | } | |
3373 | allsigs = 0; | |
3374 | sigfirst = siglast = -1; | |
3375 | ||
3376 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3377 | { | |
3378 | /* Apply action to all signals except those used by the | |
3379 | debugger. Silently skip those. */ | |
3380 | allsigs = 1; | |
3381 | sigfirst = 0; | |
3382 | siglast = nsigs - 1; | |
3383 | } | |
3384 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3385 | { | |
3386 | SET_SIGS (nsigs, sigs, signal_stop); | |
3387 | SET_SIGS (nsigs, sigs, signal_print); | |
3388 | } | |
3389 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3390 | { | |
3391 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3392 | } | |
3393 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3394 | { | |
3395 | SET_SIGS (nsigs, sigs, signal_print); | |
3396 | } | |
3397 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3398 | { | |
3399 | SET_SIGS (nsigs, sigs, signal_program); | |
3400 | } | |
3401 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3402 | { | |
3403 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3404 | } | |
3405 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3406 | { | |
3407 | SET_SIGS (nsigs, sigs, signal_program); | |
3408 | } | |
3409 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3410 | { | |
3411 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3412 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3413 | } | |
3414 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3415 | { | |
3416 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3417 | } | |
3418 | else if (digits > 0) | |
3419 | { | |
3420 | /* It is numeric. The numeric signal refers to our own | |
3421 | internal signal numbering from target.h, not to host/target | |
3422 | signal number. This is a feature; users really should be | |
3423 | using symbolic names anyway, and the common ones like | |
3424 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3425 | ||
3426 | sigfirst = siglast = (int) | |
3427 | target_signal_from_command (atoi (*argv)); | |
3428 | if ((*argv)[digits] == '-') | |
3429 | { | |
3430 | siglast = (int) | |
3431 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3432 | } | |
3433 | if (sigfirst > siglast) | |
3434 | { | |
3435 | /* Bet he didn't figure we'd think of this case... */ | |
3436 | signum = sigfirst; | |
3437 | sigfirst = siglast; | |
3438 | siglast = signum; | |
3439 | } | |
3440 | } | |
3441 | else | |
3442 | { | |
3443 | oursig = target_signal_from_name (*argv); | |
3444 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3445 | { | |
3446 | sigfirst = siglast = (int) oursig; | |
3447 | } | |
3448 | else | |
3449 | { | |
3450 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 3451 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
3452 | } |
3453 | } | |
3454 | ||
3455 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3456 | which signals to apply actions to. */ |
c906108c SS |
3457 | |
3458 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3459 | { | |
3460 | switch ((enum target_signal) signum) | |
3461 | { | |
3462 | case TARGET_SIGNAL_TRAP: | |
3463 | case TARGET_SIGNAL_INT: | |
3464 | if (!allsigs && !sigs[signum]) | |
3465 | { | |
3466 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 3467 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
3468 | { |
3469 | sigs[signum] = 1; | |
3470 | } | |
3471 | else | |
3472 | { | |
a3f17187 | 3473 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
3474 | gdb_flush (gdb_stdout); |
3475 | } | |
3476 | } | |
3477 | break; | |
3478 | case TARGET_SIGNAL_0: | |
3479 | case TARGET_SIGNAL_DEFAULT: | |
3480 | case TARGET_SIGNAL_UNKNOWN: | |
3481 | /* Make sure that "all" doesn't print these. */ | |
3482 | break; | |
3483 | default: | |
3484 | sigs[signum] = 1; | |
3485 | break; | |
3486 | } | |
3487 | } | |
3488 | ||
3489 | argv++; | |
3490 | } | |
3491 | ||
39f77062 | 3492 | target_notice_signals (inferior_ptid); |
c906108c SS |
3493 | |
3494 | if (from_tty) | |
3495 | { | |
3496 | /* Show the results. */ | |
3497 | sig_print_header (); | |
3498 | for (signum = 0; signum < nsigs; signum++) | |
3499 | { | |
3500 | if (sigs[signum]) | |
3501 | { | |
3502 | sig_print_info (signum); | |
3503 | } | |
3504 | } | |
3505 | } | |
3506 | ||
3507 | do_cleanups (old_chain); | |
3508 | } | |
3509 | ||
3510 | static void | |
96baa820 | 3511 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3512 | { |
3513 | char **argv; | |
3514 | struct cleanup *old_chain; | |
3515 | ||
3516 | /* Break the command line up into args. */ | |
3517 | ||
3518 | argv = buildargv (args); | |
3519 | if (argv == NULL) | |
3520 | { | |
3521 | nomem (0); | |
3522 | } | |
7a292a7a | 3523 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3524 | if (argv[1] != (char *) NULL) |
3525 | { | |
3526 | char *argBuf; | |
3527 | int bufLen; | |
3528 | ||
3529 | bufLen = strlen (argv[0]) + 20; | |
3530 | argBuf = (char *) xmalloc (bufLen); | |
3531 | if (argBuf) | |
3532 | { | |
3533 | int validFlag = 1; | |
3534 | enum target_signal oursig; | |
3535 | ||
3536 | oursig = target_signal_from_name (argv[0]); | |
3537 | memset (argBuf, 0, bufLen); | |
3538 | if (strcmp (argv[1], "Q") == 0) | |
3539 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3540 | else | |
3541 | { | |
3542 | if (strcmp (argv[1], "s") == 0) | |
3543 | { | |
3544 | if (!signal_stop[oursig]) | |
3545 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3546 | else | |
3547 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3548 | } | |
3549 | else if (strcmp (argv[1], "i") == 0) | |
3550 | { | |
3551 | if (!signal_program[oursig]) | |
3552 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3553 | else | |
3554 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3555 | } | |
3556 | else if (strcmp (argv[1], "r") == 0) | |
3557 | { | |
3558 | if (!signal_print[oursig]) | |
3559 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3560 | else | |
3561 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3562 | } | |
3563 | else | |
3564 | validFlag = 0; | |
3565 | } | |
3566 | if (validFlag) | |
3567 | handle_command (argBuf, from_tty); | |
3568 | else | |
a3f17187 | 3569 | printf_filtered (_("Invalid signal handling flag.\n")); |
c906108c | 3570 | if (argBuf) |
b8c9b27d | 3571 | xfree (argBuf); |
c906108c SS |
3572 | } |
3573 | } | |
3574 | do_cleanups (old_chain); | |
3575 | } | |
3576 | ||
3577 | /* Print current contents of the tables set by the handle command. | |
3578 | It is possible we should just be printing signals actually used | |
3579 | by the current target (but for things to work right when switching | |
3580 | targets, all signals should be in the signal tables). */ | |
3581 | ||
3582 | static void | |
96baa820 | 3583 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3584 | { |
3585 | enum target_signal oursig; | |
3586 | sig_print_header (); | |
3587 | ||
3588 | if (signum_exp) | |
3589 | { | |
3590 | /* First see if this is a symbol name. */ | |
3591 | oursig = target_signal_from_name (signum_exp); | |
3592 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3593 | { | |
3594 | /* No, try numeric. */ | |
3595 | oursig = | |
bb518678 | 3596 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3597 | } |
3598 | sig_print_info (oursig); | |
3599 | return; | |
3600 | } | |
3601 | ||
3602 | printf_filtered ("\n"); | |
3603 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3604 | for (oursig = TARGET_SIGNAL_FIRST; | |
3605 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3606 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3607 | { | |
3608 | QUIT; | |
3609 | ||
3610 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 3611 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
3612 | sig_print_info (oursig); |
3613 | } | |
3614 | ||
a3f17187 | 3615 | printf_filtered (_("\nUse the \"handle\" command to change these tables.\n")); |
c906108c SS |
3616 | } |
3617 | \f | |
7a292a7a SS |
3618 | struct inferior_status |
3619 | { | |
3620 | enum target_signal stop_signal; | |
3621 | CORE_ADDR stop_pc; | |
3622 | bpstat stop_bpstat; | |
3623 | int stop_step; | |
3624 | int stop_stack_dummy; | |
3625 | int stopped_by_random_signal; | |
3626 | int trap_expected; | |
3627 | CORE_ADDR step_range_start; | |
3628 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 3629 | struct frame_id step_frame_id; |
5fbbeb29 | 3630 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3631 | CORE_ADDR step_resume_break_address; |
3632 | int stop_after_trap; | |
c0236d92 | 3633 | int stop_soon; |
72cec141 | 3634 | struct regcache *stop_registers; |
7a292a7a SS |
3635 | |
3636 | /* These are here because if call_function_by_hand has written some | |
3637 | registers and then decides to call error(), we better not have changed | |
3638 | any registers. */ | |
72cec141 | 3639 | struct regcache *registers; |
7a292a7a | 3640 | |
101dcfbe AC |
3641 | /* A frame unique identifier. */ |
3642 | struct frame_id selected_frame_id; | |
3643 | ||
7a292a7a SS |
3644 | int breakpoint_proceeded; |
3645 | int restore_stack_info; | |
3646 | int proceed_to_finish; | |
3647 | }; | |
3648 | ||
7a292a7a | 3649 | void |
96baa820 JM |
3650 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3651 | LONGEST val) | |
7a292a7a | 3652 | { |
3acba339 | 3653 | int size = register_size (current_gdbarch, regno); |
7a292a7a SS |
3654 | void *buf = alloca (size); |
3655 | store_signed_integer (buf, size, val); | |
0818c12a | 3656 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
3657 | } |
3658 | ||
c906108c SS |
3659 | /* Save all of the information associated with the inferior<==>gdb |
3660 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3661 | (defined in inferior.h). */ | |
3662 | ||
7a292a7a | 3663 | struct inferior_status * |
96baa820 | 3664 | save_inferior_status (int restore_stack_info) |
c906108c | 3665 | { |
72cec141 | 3666 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 3667 | |
c906108c SS |
3668 | inf_status->stop_signal = stop_signal; |
3669 | inf_status->stop_pc = stop_pc; | |
3670 | inf_status->stop_step = stop_step; | |
3671 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3672 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3673 | inf_status->trap_expected = trap_expected; | |
3674 | inf_status->step_range_start = step_range_start; | |
3675 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 3676 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
3677 | inf_status->step_over_calls = step_over_calls; |
3678 | inf_status->stop_after_trap = stop_after_trap; | |
c0236d92 | 3679 | inf_status->stop_soon = stop_soon; |
c906108c SS |
3680 | /* Save original bpstat chain here; replace it with copy of chain. |
3681 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3682 | hand them back the original chain when restore_inferior_status is |
3683 | called. */ | |
c906108c SS |
3684 | inf_status->stop_bpstat = stop_bpstat; |
3685 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3686 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3687 | inf_status->restore_stack_info = restore_stack_info; | |
3688 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3689 | |
72cec141 | 3690 | inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers); |
c906108c | 3691 | |
72cec141 | 3692 | inf_status->registers = regcache_dup (current_regcache); |
c906108c | 3693 | |
206415a3 | 3694 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
7a292a7a | 3695 | return inf_status; |
c906108c SS |
3696 | } |
3697 | ||
c906108c | 3698 | static int |
96baa820 | 3699 | restore_selected_frame (void *args) |
c906108c | 3700 | { |
488f131b | 3701 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 3702 | struct frame_info *frame; |
c906108c | 3703 | |
101dcfbe | 3704 | frame = frame_find_by_id (*fid); |
c906108c | 3705 | |
aa0cd9c1 AC |
3706 | /* If inf_status->selected_frame_id is NULL, there was no previously |
3707 | selected frame. */ | |
101dcfbe | 3708 | if (frame == NULL) |
c906108c | 3709 | { |
8a3fe4f8 | 3710 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
3711 | return 0; |
3712 | } | |
3713 | ||
0f7d239c | 3714 | select_frame (frame); |
c906108c SS |
3715 | |
3716 | return (1); | |
3717 | } | |
3718 | ||
3719 | void | |
96baa820 | 3720 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3721 | { |
3722 | stop_signal = inf_status->stop_signal; | |
3723 | stop_pc = inf_status->stop_pc; | |
3724 | stop_step = inf_status->stop_step; | |
3725 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3726 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3727 | trap_expected = inf_status->trap_expected; | |
3728 | step_range_start = inf_status->step_range_start; | |
3729 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 3730 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
3731 | step_over_calls = inf_status->step_over_calls; |
3732 | stop_after_trap = inf_status->stop_after_trap; | |
c0236d92 | 3733 | stop_soon = inf_status->stop_soon; |
c906108c SS |
3734 | bpstat_clear (&stop_bpstat); |
3735 | stop_bpstat = inf_status->stop_bpstat; | |
3736 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3737 | proceed_to_finish = inf_status->proceed_to_finish; | |
3738 | ||
72cec141 AC |
3739 | /* FIXME: Is the restore of stop_registers always needed. */ |
3740 | regcache_xfree (stop_registers); | |
3741 | stop_registers = inf_status->stop_registers; | |
c906108c SS |
3742 | |
3743 | /* The inferior can be gone if the user types "print exit(0)" | |
3744 | (and perhaps other times). */ | |
3745 | if (target_has_execution) | |
72cec141 AC |
3746 | /* NB: The register write goes through to the target. */ |
3747 | regcache_cpy (current_regcache, inf_status->registers); | |
3748 | regcache_xfree (inf_status->registers); | |
c906108c | 3749 | |
c906108c SS |
3750 | /* FIXME: If we are being called after stopping in a function which |
3751 | is called from gdb, we should not be trying to restore the | |
3752 | selected frame; it just prints a spurious error message (The | |
3753 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3754 | clobbers the stack)). In fact, should we be restoring the | |
3755 | inferior status at all in that case? . */ | |
3756 | ||
3757 | if (target_has_stack && inf_status->restore_stack_info) | |
3758 | { | |
c906108c | 3759 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
3760 | walking the stack might encounter a garbage pointer and |
3761 | error() trying to dereference it. */ | |
488f131b JB |
3762 | if (catch_errors |
3763 | (restore_selected_frame, &inf_status->selected_frame_id, | |
3764 | "Unable to restore previously selected frame:\n", | |
3765 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
3766 | /* Error in restoring the selected frame. Select the innermost |
3767 | frame. */ | |
0f7d239c | 3768 | select_frame (get_current_frame ()); |
c906108c SS |
3769 | |
3770 | } | |
c906108c | 3771 | |
72cec141 | 3772 | xfree (inf_status); |
7a292a7a | 3773 | } |
c906108c | 3774 | |
74b7792f AC |
3775 | static void |
3776 | do_restore_inferior_status_cleanup (void *sts) | |
3777 | { | |
3778 | restore_inferior_status (sts); | |
3779 | } | |
3780 | ||
3781 | struct cleanup * | |
3782 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
3783 | { | |
3784 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
3785 | } | |
3786 | ||
c906108c | 3787 | void |
96baa820 | 3788 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3789 | { |
3790 | /* See save_inferior_status for info on stop_bpstat. */ | |
3791 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 AC |
3792 | regcache_xfree (inf_status->registers); |
3793 | regcache_xfree (inf_status->stop_registers); | |
3794 | xfree (inf_status); | |
7a292a7a SS |
3795 | } |
3796 | ||
47932f85 DJ |
3797 | int |
3798 | inferior_has_forked (int pid, int *child_pid) | |
3799 | { | |
3800 | struct target_waitstatus last; | |
3801 | ptid_t last_ptid; | |
3802 | ||
3803 | get_last_target_status (&last_ptid, &last); | |
3804 | ||
3805 | if (last.kind != TARGET_WAITKIND_FORKED) | |
3806 | return 0; | |
3807 | ||
3808 | if (ptid_get_pid (last_ptid) != pid) | |
3809 | return 0; | |
3810 | ||
3811 | *child_pid = last.value.related_pid; | |
3812 | return 1; | |
3813 | } | |
3814 | ||
3815 | int | |
3816 | inferior_has_vforked (int pid, int *child_pid) | |
3817 | { | |
3818 | struct target_waitstatus last; | |
3819 | ptid_t last_ptid; | |
3820 | ||
3821 | get_last_target_status (&last_ptid, &last); | |
3822 | ||
3823 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
3824 | return 0; | |
3825 | ||
3826 | if (ptid_get_pid (last_ptid) != pid) | |
3827 | return 0; | |
3828 | ||
3829 | *child_pid = last.value.related_pid; | |
3830 | return 1; | |
3831 | } | |
3832 | ||
3833 | int | |
3834 | inferior_has_execd (int pid, char **execd_pathname) | |
3835 | { | |
3836 | struct target_waitstatus last; | |
3837 | ptid_t last_ptid; | |
3838 | ||
3839 | get_last_target_status (&last_ptid, &last); | |
3840 | ||
3841 | if (last.kind != TARGET_WAITKIND_EXECD) | |
3842 | return 0; | |
3843 | ||
3844 | if (ptid_get_pid (last_ptid) != pid) | |
3845 | return 0; | |
3846 | ||
3847 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
3848 | return 1; | |
3849 | } | |
3850 | ||
ca6724c1 KB |
3851 | /* Oft used ptids */ |
3852 | ptid_t null_ptid; | |
3853 | ptid_t minus_one_ptid; | |
3854 | ||
3855 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 3856 | |
ca6724c1 KB |
3857 | ptid_t |
3858 | ptid_build (int pid, long lwp, long tid) | |
3859 | { | |
3860 | ptid_t ptid; | |
3861 | ||
3862 | ptid.pid = pid; | |
3863 | ptid.lwp = lwp; | |
3864 | ptid.tid = tid; | |
3865 | return ptid; | |
3866 | } | |
3867 | ||
3868 | /* Create a ptid from just a pid. */ | |
3869 | ||
3870 | ptid_t | |
3871 | pid_to_ptid (int pid) | |
3872 | { | |
3873 | return ptid_build (pid, 0, 0); | |
3874 | } | |
3875 | ||
3876 | /* Fetch the pid (process id) component from a ptid. */ | |
3877 | ||
3878 | int | |
3879 | ptid_get_pid (ptid_t ptid) | |
3880 | { | |
3881 | return ptid.pid; | |
3882 | } | |
3883 | ||
3884 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
3885 | ||
3886 | long | |
3887 | ptid_get_lwp (ptid_t ptid) | |
3888 | { | |
3889 | return ptid.lwp; | |
3890 | } | |
3891 | ||
3892 | /* Fetch the tid (thread id) component from a ptid. */ | |
3893 | ||
3894 | long | |
3895 | ptid_get_tid (ptid_t ptid) | |
3896 | { | |
3897 | return ptid.tid; | |
3898 | } | |
3899 | ||
3900 | /* ptid_equal() is used to test equality of two ptids. */ | |
3901 | ||
3902 | int | |
3903 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
3904 | { | |
3905 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 3906 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
3907 | } |
3908 | ||
3909 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
3910 | to restore the inferior_ptid value saved in a call to | |
3911 | save_inferior_ptid(). */ | |
ce696e05 KB |
3912 | |
3913 | static void | |
3914 | restore_inferior_ptid (void *arg) | |
3915 | { | |
3916 | ptid_t *saved_ptid_ptr = arg; | |
3917 | inferior_ptid = *saved_ptid_ptr; | |
3918 | xfree (arg); | |
3919 | } | |
3920 | ||
3921 | /* Save the value of inferior_ptid so that it may be restored by a | |
3922 | later call to do_cleanups(). Returns the struct cleanup pointer | |
3923 | needed for later doing the cleanup. */ | |
3924 | ||
3925 | struct cleanup * | |
3926 | save_inferior_ptid (void) | |
3927 | { | |
3928 | ptid_t *saved_ptid_ptr; | |
3929 | ||
3930 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
3931 | *saved_ptid_ptr = inferior_ptid; | |
3932 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
3933 | } | |
c5aa993b | 3934 | \f |
488f131b | 3935 | |
7a292a7a | 3936 | static void |
96baa820 | 3937 | build_infrun (void) |
7a292a7a | 3938 | { |
72cec141 | 3939 | stop_registers = regcache_xmalloc (current_gdbarch); |
7a292a7a | 3940 | } |
c906108c | 3941 | |
c906108c | 3942 | void |
96baa820 | 3943 | _initialize_infrun (void) |
c906108c | 3944 | { |
52f0bd74 AC |
3945 | int i; |
3946 | int numsigs; | |
c906108c SS |
3947 | struct cmd_list_element *c; |
3948 | ||
046a4708 AC |
3949 | DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers); |
3950 | deprecated_register_gdbarch_swap (NULL, 0, build_infrun); | |
0f71a2f6 | 3951 | |
1bedd215 AC |
3952 | add_info ("signals", signals_info, _("\ |
3953 | What debugger does when program gets various signals.\n\ | |
3954 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
3955 | add_info_alias ("handle", "signals", 0); |
3956 | ||
1bedd215 AC |
3957 | add_com ("handle", class_run, handle_command, _("\ |
3958 | Specify how to handle a signal.\n\ | |
c906108c SS |
3959 | Args are signals and actions to apply to those signals.\n\ |
3960 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3961 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3962 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3963 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
3964 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
3965 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
c906108c SS |
3966 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
3967 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3968 | Print means print a message if this signal happens.\n\ | |
3969 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3970 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 3971 | Pass and Stop may be combined.")); |
c906108c SS |
3972 | if (xdb_commands) |
3973 | { | |
1bedd215 AC |
3974 | add_com ("lz", class_info, signals_info, _("\ |
3975 | What debugger does when program gets various signals.\n\ | |
3976 | Specify a signal as argument to print info on that signal only.")); | |
3977 | add_com ("z", class_run, xdb_handle_command, _("\ | |
3978 | Specify how to handle a signal.\n\ | |
c906108c SS |
3979 | Args are signals and actions to apply to those signals.\n\ |
3980 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3981 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3982 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3983 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
3984 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
3985 | Recognized actions include \"s\" (toggles between stop and nostop), \n\ | |
c906108c SS |
3986 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
3987 | nopass), \"Q\" (noprint)\n\ | |
3988 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3989 | Print means print a message if this signal happens.\n\ | |
3990 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3991 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 3992 | Pass and Stop may be combined.")); |
c906108c SS |
3993 | } |
3994 | ||
3995 | if (!dbx_commands) | |
1a966eab AC |
3996 | stop_command = add_cmd ("stop", class_obscure, |
3997 | not_just_help_class_command, _("\ | |
3998 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 3999 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 4000 | of the program stops."), &cmdlist); |
c906108c | 4001 | |
85c07804 AC |
4002 | add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
4003 | Set inferior debugging."), _("\ | |
4004 | Show inferior debugging."), _("\ | |
4005 | When non-zero, inferior specific debugging is enabled."), | |
4006 | NULL, | |
920d2a44 | 4007 | show_debug_infrun, |
85c07804 | 4008 | &setdebuglist, &showdebuglist); |
527159b7 | 4009 | |
c906108c | 4010 | numsigs = (int) TARGET_SIGNAL_LAST; |
488f131b | 4011 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
4012 | signal_print = (unsigned char *) |
4013 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
4014 | signal_program = (unsigned char *) | |
4015 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
4016 | for (i = 0; i < numsigs; i++) | |
4017 | { | |
4018 | signal_stop[i] = 1; | |
4019 | signal_print[i] = 1; | |
4020 | signal_program[i] = 1; | |
4021 | } | |
4022 | ||
4023 | /* Signals caused by debugger's own actions | |
4024 | should not be given to the program afterwards. */ | |
4025 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
4026 | signal_program[TARGET_SIGNAL_INT] = 0; | |
4027 | ||
4028 | /* Signals that are not errors should not normally enter the debugger. */ | |
4029 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
4030 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
4031 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
4032 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
4033 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
4034 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
4035 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
4036 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
4037 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
4038 | signal_print[TARGET_SIGNAL_IO] = 0; | |
4039 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
4040 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
4041 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
4042 | signal_print[TARGET_SIGNAL_URG] = 0; | |
4043 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
4044 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
4045 | ||
cd0fc7c3 SS |
4046 | /* These signals are used internally by user-level thread |
4047 | implementations. (See signal(5) on Solaris.) Like the above | |
4048 | signals, a healthy program receives and handles them as part of | |
4049 | its normal operation. */ | |
4050 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
4051 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
4052 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
4053 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
4054 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
4055 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
4056 | ||
85c07804 AC |
4057 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
4058 | &stop_on_solib_events, _("\ | |
4059 | Set stopping for shared library events."), _("\ | |
4060 | Show stopping for shared library events."), _("\ | |
c906108c SS |
4061 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
4062 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 AC |
4063 | to the user would be loading/unloading of a new library."), |
4064 | NULL, | |
920d2a44 | 4065 | show_stop_on_solib_events, |
85c07804 | 4066 | &setlist, &showlist); |
c906108c | 4067 | |
7ab04401 AC |
4068 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
4069 | follow_fork_mode_kind_names, | |
4070 | &follow_fork_mode_string, _("\ | |
4071 | Set debugger response to a program call of fork or vfork."), _("\ | |
4072 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
4073 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
4074 | parent - the original process is debugged after a fork\n\ | |
4075 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 4076 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
4077 | By default, the debugger will follow the parent process."), |
4078 | NULL, | |
920d2a44 | 4079 | show_follow_fork_mode_string, |
7ab04401 AC |
4080 | &setlist, &showlist); |
4081 | ||
4082 | add_setshow_enum_cmd ("scheduler-locking", class_run, | |
4083 | scheduler_enums, &scheduler_mode, _("\ | |
4084 | Set mode for locking scheduler during execution."), _("\ | |
4085 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
4086 | off == no locking (threads may preempt at any time)\n\ |
4087 | on == full locking (no thread except the current thread may run)\n\ | |
4088 | step == scheduler locked during every single-step operation.\n\ | |
4089 | In this mode, no other thread may run during a step command.\n\ | |
7ab04401 AC |
4090 | Other threads may run while stepping over a function call ('next')."), |
4091 | set_schedlock_func, /* traps on target vector */ | |
920d2a44 | 4092 | show_scheduler_mode, |
7ab04401 | 4093 | &setlist, &showlist); |
5fbbeb29 | 4094 | |
5bf193a2 AC |
4095 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
4096 | Set mode of the step operation."), _("\ | |
4097 | Show mode of the step operation."), _("\ | |
4098 | When set, doing a step over a function without debug line information\n\ | |
4099 | will stop at the first instruction of that function. Otherwise, the\n\ | |
4100 | function is skipped and the step command stops at a different source line."), | |
4101 | NULL, | |
920d2a44 | 4102 | show_step_stop_if_no_debug, |
5bf193a2 | 4103 | &setlist, &showlist); |
ca6724c1 KB |
4104 | |
4105 | /* ptid initializations */ | |
4106 | null_ptid = ptid_build (0, 0, 0); | |
4107 | minus_one_ptid = ptid_build (-1, 0, 0); | |
4108 | inferior_ptid = null_ptid; | |
4109 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 4110 | } |