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). */ | |
689 | flush_cached_frames (); | |
690 | registers_changed (); | |
691 | stop_pc = wait_pc; | |
692 | select_frame (get_current_frame ()); | |
693 | } | |
694 | ||
8fb3e588 AC |
695 | /* We return 1 to indicate that there is a breakpoint here, |
696 | so we need to step over it before continuing to avoid | |
697 | hitting it straight away. */ | |
698 | if (breakpoint_here_p (wait_pc)) | |
699 | return 1; | |
ea67f13b DJ |
700 | } |
701 | ||
702 | return 0; | |
8fb3e588 | 703 | |
ea67f13b | 704 | } |
e4846b08 JJ |
705 | |
706 | /* Record the pc of the program the last time it stopped. This is | |
707 | just used internally by wait_for_inferior, but need to be preserved | |
708 | over calls to it and cleared when the inferior is started. */ | |
709 | static CORE_ADDR prev_pc; | |
710 | ||
c906108c SS |
711 | /* Basic routine for continuing the program in various fashions. |
712 | ||
713 | ADDR is the address to resume at, or -1 for resume where stopped. | |
714 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 715 | or -1 for act according to how it stopped. |
c906108c | 716 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
717 | -1 means return after that and print nothing. |
718 | You should probably set various step_... variables | |
719 | before calling here, if you are stepping. | |
c906108c SS |
720 | |
721 | You should call clear_proceed_status before calling proceed. */ | |
722 | ||
723 | void | |
96baa820 | 724 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
725 | { |
726 | int oneproc = 0; | |
727 | ||
728 | if (step > 0) | |
729 | step_start_function = find_pc_function (read_pc ()); | |
730 | if (step < 0) | |
731 | stop_after_trap = 1; | |
732 | ||
2acceee2 | 733 | if (addr == (CORE_ADDR) -1) |
c906108c | 734 | { |
c906108c | 735 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) |
3352ef37 AC |
736 | /* There is a breakpoint at the address we will resume at, |
737 | step one instruction before inserting breakpoints so that | |
738 | we do not stop right away (and report a second hit at this | |
739 | breakpoint). */ | |
c906108c | 740 | oneproc = 1; |
3352ef37 AC |
741 | else if (gdbarch_single_step_through_delay_p (current_gdbarch) |
742 | && gdbarch_single_step_through_delay (current_gdbarch, | |
743 | get_current_frame ())) | |
744 | /* We stepped onto an instruction that needs to be stepped | |
745 | again before re-inserting the breakpoint, do so. */ | |
c906108c SS |
746 | oneproc = 1; |
747 | } | |
748 | else | |
749 | { | |
750 | write_pc (addr); | |
c906108c SS |
751 | } |
752 | ||
527159b7 | 753 | if (debug_infrun) |
8a9de0e4 AC |
754 | fprintf_unfiltered (gdb_stdlog, |
755 | "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n", | |
756 | paddr_nz (addr), siggnal, step); | |
527159b7 | 757 | |
c906108c SS |
758 | /* In a multi-threaded task we may select another thread |
759 | and then continue or step. | |
760 | ||
761 | But if the old thread was stopped at a breakpoint, it | |
762 | will immediately cause another breakpoint stop without | |
763 | any execution (i.e. it will report a breakpoint hit | |
764 | incorrectly). So we must step over it first. | |
765 | ||
ea67f13b | 766 | prepare_to_proceed checks the current thread against the thread |
c906108c SS |
767 | that reported the most recent event. If a step-over is required |
768 | it returns TRUE and sets the current thread to the old thread. */ | |
ea67f13b DJ |
769 | if (prepare_to_proceed () && breakpoint_here_p (read_pc ())) |
770 | oneproc = 1; | |
c906108c | 771 | |
c906108c SS |
772 | if (oneproc) |
773 | /* We will get a trace trap after one instruction. | |
774 | Continue it automatically and insert breakpoints then. */ | |
775 | trap_expected = 1; | |
776 | else | |
777 | { | |
81d0cc19 GS |
778 | insert_breakpoints (); |
779 | /* If we get here there was no call to error() in | |
8fb3e588 | 780 | insert breakpoints -- so they were inserted. */ |
c906108c SS |
781 | breakpoints_inserted = 1; |
782 | } | |
783 | ||
784 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
785 | stop_signal = siggnal; | |
786 | /* If this signal should not be seen by program, | |
787 | give it zero. Used for debugging signals. */ | |
788 | else if (!signal_program[stop_signal]) | |
789 | stop_signal = TARGET_SIGNAL_0; | |
790 | ||
791 | annotate_starting (); | |
792 | ||
793 | /* Make sure that output from GDB appears before output from the | |
794 | inferior. */ | |
795 | gdb_flush (gdb_stdout); | |
796 | ||
e4846b08 JJ |
797 | /* Refresh prev_pc value just prior to resuming. This used to be |
798 | done in stop_stepping, however, setting prev_pc there did not handle | |
799 | scenarios such as inferior function calls or returning from | |
800 | a function via the return command. In those cases, the prev_pc | |
801 | value was not set properly for subsequent commands. The prev_pc value | |
802 | is used to initialize the starting line number in the ecs. With an | |
803 | invalid value, the gdb next command ends up stopping at the position | |
804 | represented by the next line table entry past our start position. | |
805 | On platforms that generate one line table entry per line, this | |
806 | is not a problem. However, on the ia64, the compiler generates | |
807 | extraneous line table entries that do not increase the line number. | |
808 | When we issue the gdb next command on the ia64 after an inferior call | |
809 | or a return command, we often end up a few instructions forward, still | |
810 | within the original line we started. | |
811 | ||
812 | An attempt was made to have init_execution_control_state () refresh | |
813 | the prev_pc value before calculating the line number. This approach | |
814 | did not work because on platforms that use ptrace, the pc register | |
815 | cannot be read unless the inferior is stopped. At that point, we | |
816 | are not guaranteed the inferior is stopped and so the read_pc () | |
817 | call can fail. Setting the prev_pc value here ensures the value is | |
8fb3e588 | 818 | updated correctly when the inferior is stopped. */ |
e4846b08 JJ |
819 | prev_pc = read_pc (); |
820 | ||
c906108c SS |
821 | /* Resume inferior. */ |
822 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
823 | ||
824 | /* Wait for it to stop (if not standalone) | |
825 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
826 | /* Do this only if we are not using the event loop, or if the target |
827 | does not support asynchronous execution. */ | |
362646f5 | 828 | if (!target_can_async_p ()) |
43ff13b4 JM |
829 | { |
830 | wait_for_inferior (); | |
831 | normal_stop (); | |
832 | } | |
c906108c | 833 | } |
c906108c SS |
834 | \f |
835 | ||
836 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 837 | |
c906108c | 838 | void |
8621d6a9 | 839 | start_remote (int from_tty) |
c906108c SS |
840 | { |
841 | init_thread_list (); | |
842 | init_wait_for_inferior (); | |
c0236d92 | 843 | stop_soon = STOP_QUIETLY; |
c906108c | 844 | trap_expected = 0; |
43ff13b4 | 845 | |
6426a772 JM |
846 | /* Always go on waiting for the target, regardless of the mode. */ |
847 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 848 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
849 | nothing is returned (instead of just blocking). Because of this, |
850 | targets expecting an immediate response need to, internally, set | |
851 | things up so that the target_wait() is forced to eventually | |
852 | timeout. */ | |
853 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
854 | differentiate to its caller what the state of the target is after | |
855 | the initial open has been performed. Here we're assuming that | |
856 | the target has stopped. It should be possible to eventually have | |
857 | target_open() return to the caller an indication that the target | |
858 | is currently running and GDB state should be set to the same as | |
859 | for an async run. */ | |
860 | wait_for_inferior (); | |
8621d6a9 DJ |
861 | |
862 | /* Now that the inferior has stopped, do any bookkeeping like | |
863 | loading shared libraries. We want to do this before normal_stop, | |
864 | so that the displayed frame is up to date. */ | |
865 | post_create_inferior (¤t_target, from_tty); | |
866 | ||
6426a772 | 867 | normal_stop (); |
c906108c SS |
868 | } |
869 | ||
870 | /* Initialize static vars when a new inferior begins. */ | |
871 | ||
872 | void | |
96baa820 | 873 | init_wait_for_inferior (void) |
c906108c SS |
874 | { |
875 | /* These are meaningless until the first time through wait_for_inferior. */ | |
876 | prev_pc = 0; | |
c906108c | 877 | |
c906108c SS |
878 | breakpoints_inserted = 0; |
879 | breakpoint_init_inferior (inf_starting); | |
880 | ||
881 | /* Don't confuse first call to proceed(). */ | |
882 | stop_signal = TARGET_SIGNAL_0; | |
883 | ||
884 | /* The first resume is not following a fork/vfork/exec. */ | |
885 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
c906108c | 886 | |
c906108c | 887 | clear_proceed_status (); |
9f976b41 DJ |
888 | |
889 | stepping_past_singlestep_breakpoint = 0; | |
c906108c | 890 | } |
c906108c | 891 | \f |
b83266a0 SS |
892 | /* This enum encodes possible reasons for doing a target_wait, so that |
893 | wfi can call target_wait in one place. (Ultimately the call will be | |
894 | moved out of the infinite loop entirely.) */ | |
895 | ||
c5aa993b JM |
896 | enum infwait_states |
897 | { | |
cd0fc7c3 SS |
898 | infwait_normal_state, |
899 | infwait_thread_hop_state, | |
cd0fc7c3 | 900 | infwait_nonstep_watch_state |
b83266a0 SS |
901 | }; |
902 | ||
11cf8741 JM |
903 | /* Why did the inferior stop? Used to print the appropriate messages |
904 | to the interface from within handle_inferior_event(). */ | |
905 | enum inferior_stop_reason | |
906 | { | |
907 | /* We don't know why. */ | |
908 | STOP_UNKNOWN, | |
909 | /* Step, next, nexti, stepi finished. */ | |
910 | END_STEPPING_RANGE, | |
911 | /* Found breakpoint. */ | |
912 | BREAKPOINT_HIT, | |
913 | /* Inferior terminated by signal. */ | |
914 | SIGNAL_EXITED, | |
915 | /* Inferior exited. */ | |
916 | EXITED, | |
917 | /* Inferior received signal, and user asked to be notified. */ | |
918 | SIGNAL_RECEIVED | |
919 | }; | |
920 | ||
cd0fc7c3 SS |
921 | /* This structure contains what used to be local variables in |
922 | wait_for_inferior. Probably many of them can return to being | |
923 | locals in handle_inferior_event. */ | |
924 | ||
c5aa993b | 925 | struct execution_control_state |
488f131b JB |
926 | { |
927 | struct target_waitstatus ws; | |
928 | struct target_waitstatus *wp; | |
929 | int another_trap; | |
930 | int random_signal; | |
931 | CORE_ADDR stop_func_start; | |
932 | CORE_ADDR stop_func_end; | |
933 | char *stop_func_name; | |
934 | struct symtab_and_line sal; | |
488f131b JB |
935 | int current_line; |
936 | struct symtab *current_symtab; | |
937 | int handling_longjmp; /* FIXME */ | |
938 | ptid_t ptid; | |
939 | ptid_t saved_inferior_ptid; | |
68f53502 | 940 | int step_after_step_resume_breakpoint; |
488f131b JB |
941 | int stepping_through_solib_after_catch; |
942 | bpstat stepping_through_solib_catchpoints; | |
488f131b JB |
943 | int new_thread_event; |
944 | struct target_waitstatus tmpstatus; | |
945 | enum infwait_states infwait_state; | |
946 | ptid_t waiton_ptid; | |
947 | int wait_some_more; | |
948 | }; | |
949 | ||
950 | void init_execution_control_state (struct execution_control_state *ecs); | |
951 | ||
952 | void handle_inferior_event (struct execution_control_state *ecs); | |
cd0fc7c3 | 953 | |
c2c6d25f | 954 | static void step_into_function (struct execution_control_state *ecs); |
44cbf7b5 | 955 | static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame); |
14e60db5 | 956 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); |
44cbf7b5 AC |
957 | static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, |
958 | struct frame_id sr_id); | |
104c1213 JM |
959 | static void stop_stepping (struct execution_control_state *ecs); |
960 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 961 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
962 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
963 | int stop_info); | |
104c1213 | 964 | |
cd0fc7c3 SS |
965 | /* Wait for control to return from inferior to debugger. |
966 | If inferior gets a signal, we may decide to start it up again | |
967 | instead of returning. That is why there is a loop in this function. | |
968 | When this function actually returns it means the inferior | |
969 | should be left stopped and GDB should read more commands. */ | |
970 | ||
971 | void | |
96baa820 | 972 | wait_for_inferior (void) |
cd0fc7c3 SS |
973 | { |
974 | struct cleanup *old_cleanups; | |
975 | struct execution_control_state ecss; | |
976 | struct execution_control_state *ecs; | |
c906108c | 977 | |
527159b7 | 978 | if (debug_infrun) |
8a9de0e4 | 979 | fprintf_unfiltered (gdb_stdlog, "infrun: wait_for_inferior\n"); |
527159b7 | 980 | |
8601f500 | 981 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c | 982 | &step_resume_breakpoint); |
cd0fc7c3 SS |
983 | |
984 | /* wfi still stays in a loop, so it's OK just to take the address of | |
985 | a local to get the ecs pointer. */ | |
986 | ecs = &ecss; | |
987 | ||
988 | /* Fill in with reasonable starting values. */ | |
989 | init_execution_control_state (ecs); | |
990 | ||
c906108c | 991 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 992 | previous_inferior_ptid = inferior_ptid; |
c906108c | 993 | |
cd0fc7c3 SS |
994 | overlay_cache_invalid = 1; |
995 | ||
996 | /* We have to invalidate the registers BEFORE calling target_wait | |
997 | because they can be loaded from the target while in target_wait. | |
998 | This makes remote debugging a bit more efficient for those | |
999 | targets that provide critical registers as part of their normal | |
1000 | status mechanism. */ | |
1001 | ||
1002 | registers_changed (); | |
b83266a0 | 1003 | |
c906108c SS |
1004 | while (1) |
1005 | { | |
9a4105ab AC |
1006 | if (deprecated_target_wait_hook) |
1007 | ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp); | |
cd0fc7c3 | 1008 | else |
39f77062 | 1009 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
c906108c | 1010 | |
cd0fc7c3 SS |
1011 | /* Now figure out what to do with the result of the result. */ |
1012 | handle_inferior_event (ecs); | |
c906108c | 1013 | |
cd0fc7c3 SS |
1014 | if (!ecs->wait_some_more) |
1015 | break; | |
1016 | } | |
1017 | do_cleanups (old_cleanups); | |
1018 | } | |
c906108c | 1019 | |
43ff13b4 JM |
1020 | /* Asynchronous version of wait_for_inferior. It is called by the |
1021 | event loop whenever a change of state is detected on the file | |
1022 | descriptor corresponding to the target. It can be called more than | |
1023 | once to complete a single execution command. In such cases we need | |
1024 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1025 | last time that this function is called for a single execution | |
1026 | command, then report to the user that the inferior has stopped, and | |
1027 | do the necessary cleanups. */ | |
1028 | ||
1029 | struct execution_control_state async_ecss; | |
1030 | struct execution_control_state *async_ecs; | |
1031 | ||
1032 | void | |
fba45db2 | 1033 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1034 | { |
1035 | static struct cleanup *old_cleanups; | |
1036 | ||
c5aa993b | 1037 | async_ecs = &async_ecss; |
43ff13b4 JM |
1038 | |
1039 | if (!async_ecs->wait_some_more) | |
1040 | { | |
488f131b | 1041 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
c5aa993b | 1042 | &step_resume_breakpoint); |
43ff13b4 JM |
1043 | |
1044 | /* Fill in with reasonable starting values. */ | |
1045 | init_execution_control_state (async_ecs); | |
1046 | ||
43ff13b4 | 1047 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1048 | previous_inferior_ptid = inferior_ptid; |
43ff13b4 JM |
1049 | |
1050 | overlay_cache_invalid = 1; | |
1051 | ||
1052 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1053 | because they can be loaded from the target while in target_wait. |
1054 | This makes remote debugging a bit more efficient for those | |
1055 | targets that provide critical registers as part of their normal | |
1056 | status mechanism. */ | |
43ff13b4 JM |
1057 | |
1058 | registers_changed (); | |
1059 | } | |
1060 | ||
9a4105ab | 1061 | if (deprecated_target_wait_hook) |
488f131b | 1062 | async_ecs->ptid = |
9a4105ab | 1063 | deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 | 1064 | else |
39f77062 | 1065 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 JM |
1066 | |
1067 | /* Now figure out what to do with the result of the result. */ | |
1068 | handle_inferior_event (async_ecs); | |
1069 | ||
1070 | if (!async_ecs->wait_some_more) | |
1071 | { | |
adf40b2e | 1072 | /* Do only the cleanups that have been added by this |
488f131b JB |
1073 | function. Let the continuations for the commands do the rest, |
1074 | if there are any. */ | |
43ff13b4 JM |
1075 | do_exec_cleanups (old_cleanups); |
1076 | normal_stop (); | |
c2d11a7d JM |
1077 | if (step_multi && stop_step) |
1078 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1079 | else | |
1080 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1081 | } |
1082 | } | |
1083 | ||
cd0fc7c3 SS |
1084 | /* Prepare an execution control state for looping through a |
1085 | wait_for_inferior-type loop. */ | |
1086 | ||
1087 | void | |
96baa820 | 1088 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1089 | { |
6ad80df0 | 1090 | ecs->another_trap = 0; |
cd0fc7c3 | 1091 | ecs->random_signal = 0; |
68f53502 | 1092 | ecs->step_after_step_resume_breakpoint = 0; |
cd0fc7c3 | 1093 | ecs->handling_longjmp = 0; /* FIXME */ |
cd0fc7c3 SS |
1094 | ecs->stepping_through_solib_after_catch = 0; |
1095 | ecs->stepping_through_solib_catchpoints = NULL; | |
cd0fc7c3 SS |
1096 | ecs->sal = find_pc_line (prev_pc, 0); |
1097 | ecs->current_line = ecs->sal.line; | |
1098 | ecs->current_symtab = ecs->sal.symtab; | |
1099 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1100 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1101 | ecs->wp = &(ecs->ws); |
1102 | } | |
1103 | ||
e02bc4cc | 1104 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
1105 | target_wait()/deprecated_target_wait_hook(). The data is actually |
1106 | cached by handle_inferior_event(), which gets called immediately | |
1107 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
1108 | |
1109 | void | |
488f131b | 1110 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1111 | { |
39f77062 | 1112 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1113 | *status = target_last_waitstatus; |
1114 | } | |
1115 | ||
ac264b3b MS |
1116 | void |
1117 | nullify_last_target_wait_ptid (void) | |
1118 | { | |
1119 | target_last_wait_ptid = minus_one_ptid; | |
1120 | } | |
1121 | ||
dd80620e MS |
1122 | /* Switch thread contexts, maintaining "infrun state". */ |
1123 | ||
1124 | static void | |
1125 | context_switch (struct execution_control_state *ecs) | |
1126 | { | |
1127 | /* Caution: it may happen that the new thread (or the old one!) | |
1128 | is not in the thread list. In this case we must not attempt | |
1129 | to "switch context", or we run the risk that our context may | |
1130 | be lost. This may happen as a result of the target module | |
1131 | mishandling thread creation. */ | |
1132 | ||
fd48f117 DJ |
1133 | if (debug_infrun) |
1134 | { | |
1135 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
1136 | target_pid_to_str (inferior_ptid)); | |
1137 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
1138 | target_pid_to_str (ecs->ptid)); | |
1139 | } | |
1140 | ||
dd80620e | 1141 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) |
488f131b | 1142 | { /* Perform infrun state context switch: */ |
dd80620e | 1143 | /* Save infrun state for the old thread. */ |
0ce3d317 | 1144 | save_infrun_state (inferior_ptid, prev_pc, |
dd80620e | 1145 | trap_expected, step_resume_breakpoint, |
15960608 | 1146 | step_range_start, |
aa0cd9c1 | 1147 | step_range_end, &step_frame_id, |
dd80620e MS |
1148 | ecs->handling_longjmp, ecs->another_trap, |
1149 | ecs->stepping_through_solib_after_catch, | |
1150 | ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1151 | ecs->current_line, ecs->current_symtab); |
dd80620e MS |
1152 | |
1153 | /* Load infrun state for the new thread. */ | |
0ce3d317 | 1154 | load_infrun_state (ecs->ptid, &prev_pc, |
dd80620e | 1155 | &trap_expected, &step_resume_breakpoint, |
15960608 | 1156 | &step_range_start, |
aa0cd9c1 | 1157 | &step_range_end, &step_frame_id, |
dd80620e MS |
1158 | &ecs->handling_longjmp, &ecs->another_trap, |
1159 | &ecs->stepping_through_solib_after_catch, | |
1160 | &ecs->stepping_through_solib_catchpoints, | |
f2c9ca08 | 1161 | &ecs->current_line, &ecs->current_symtab); |
dd80620e MS |
1162 | } |
1163 | inferior_ptid = ecs->ptid; | |
fd48f117 | 1164 | flush_cached_frames (); |
dd80620e MS |
1165 | } |
1166 | ||
4fa8626c DJ |
1167 | static void |
1168 | adjust_pc_after_break (struct execution_control_state *ecs) | |
1169 | { | |
8aad930b | 1170 | CORE_ADDR breakpoint_pc; |
4fa8626c DJ |
1171 | |
1172 | /* If this target does not decrement the PC after breakpoints, then | |
1173 | we have nothing to do. */ | |
1174 | if (DECR_PC_AFTER_BREAK == 0) | |
1175 | return; | |
1176 | ||
1177 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If | |
1178 | we aren't, just return. | |
9709f61c DJ |
1179 | |
1180 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
1181 | affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented | |
1182 | by software breakpoints should be handled through the normal breakpoint | |
1183 | layer. | |
8fb3e588 | 1184 | |
4fa8626c DJ |
1185 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
1186 | different signals (SIGILL or SIGEMT for instance), but it is less | |
1187 | clear where the PC is pointing afterwards. It may not match | |
1188 | DECR_PC_AFTER_BREAK. I don't know any specific target that generates | |
1189 | these signals at breakpoints (the code has been in GDB since at least | |
1190 | 1992) so I can not guess how to handle them here. | |
8fb3e588 | 1191 | |
4fa8626c DJ |
1192 | In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS |
1193 | would have the PC after hitting a watchpoint affected by | |
1194 | DECR_PC_AFTER_BREAK. I haven't found any target with both of these set | |
1195 | in GDB history, and it seems unlikely to be correct, so | |
1196 | HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */ | |
1197 | ||
1198 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
1199 | return; | |
1200 | ||
1201 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
1202 | return; | |
1203 | ||
8aad930b AC |
1204 | /* Find the location where (if we've hit a breakpoint) the |
1205 | breakpoint would be. */ | |
1206 | breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK; | |
1207 | ||
1208 | if (SOFTWARE_SINGLE_STEP_P ()) | |
1209 | { | |
1210 | /* When using software single-step, a SIGTRAP can only indicate | |
8fb3e588 AC |
1211 | an inserted breakpoint. This actually makes things |
1212 | easier. */ | |
8aad930b AC |
1213 | if (singlestep_breakpoints_inserted_p) |
1214 | /* When software single stepping, the instruction at [prev_pc] | |
1215 | is never a breakpoint, but the instruction following | |
1216 | [prev_pc] (in program execution order) always is. Assume | |
1217 | that following instruction was reached and hence a software | |
1218 | breakpoint was hit. */ | |
1219 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1220 | else if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1221 | /* The inferior was free running (i.e., no single-step | |
1222 | breakpoints inserted) and it hit a software breakpoint. */ | |
1223 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1224 | } | |
1225 | else | |
1226 | { | |
1227 | /* When using hardware single-step, a SIGTRAP is reported for | |
8fb3e588 AC |
1228 | both a completed single-step and a software breakpoint. Need |
1229 | to differentiate between the two as the latter needs | |
90225438 AS |
1230 | adjusting but the former does not. |
1231 | ||
1232 | When the thread to be examined does not match the current thread | |
1233 | context we can't use currently_stepping, so assume no | |
1234 | single-stepping in this case. */ | |
1235 | if (ptid_equal (ecs->ptid, inferior_ptid) && currently_stepping (ecs)) | |
8aad930b AC |
1236 | { |
1237 | if (prev_pc == breakpoint_pc | |
1238 | && software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1239 | /* Hardware single-stepped a software breakpoint (as | |
1240 | occures when the inferior is resumed with PC pointing | |
1241 | at not-yet-hit software breakpoint). Since the | |
1242 | breakpoint really is executed, the inferior needs to be | |
1243 | backed up to the breakpoint address. */ | |
1244 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1245 | } | |
1246 | else | |
1247 | { | |
1248 | if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1249 | /* The inferior was free running (i.e., no hardware | |
1250 | single-step and no possibility of a false SIGTRAP) and | |
1251 | hit a software breakpoint. */ | |
1252 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1253 | } | |
1254 | } | |
4fa8626c DJ |
1255 | } |
1256 | ||
cd0fc7c3 SS |
1257 | /* Given an execution control state that has been freshly filled in |
1258 | by an event from the inferior, figure out what it means and take | |
1259 | appropriate action. */ | |
c906108c | 1260 | |
7270d8f2 OF |
1261 | int stepped_after_stopped_by_watchpoint; |
1262 | ||
cd0fc7c3 | 1263 | void |
96baa820 | 1264 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 1265 | { |
8bbde302 BE |
1266 | /* NOTE: bje/2005-05-02: If you're looking at this code and thinking |
1267 | that the variable stepped_after_stopped_by_watchpoint isn't used, | |
1268 | then you're wrong! See remote.c:remote_stopped_data_address. */ | |
1269 | ||
c8edd8b4 | 1270 | int sw_single_step_trap_p = 0; |
8fb3e588 | 1271 | int stopped_by_watchpoint = -1; /* Mark as unknown. */ |
cd0fc7c3 | 1272 | |
e02bc4cc | 1273 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1274 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1275 | target_last_waitstatus = *ecs->wp; |
1276 | ||
4fa8626c DJ |
1277 | adjust_pc_after_break (ecs); |
1278 | ||
488f131b JB |
1279 | switch (ecs->infwait_state) |
1280 | { | |
1281 | case infwait_thread_hop_state: | |
527159b7 | 1282 | if (debug_infrun) |
8a9de0e4 | 1283 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); |
488f131b JB |
1284 | /* Cancel the waiton_ptid. */ |
1285 | ecs->waiton_ptid = pid_to_ptid (-1); | |
65e82032 | 1286 | break; |
b83266a0 | 1287 | |
488f131b | 1288 | case infwait_normal_state: |
527159b7 | 1289 | if (debug_infrun) |
8a9de0e4 | 1290 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
488f131b JB |
1291 | stepped_after_stopped_by_watchpoint = 0; |
1292 | break; | |
b83266a0 | 1293 | |
488f131b | 1294 | case infwait_nonstep_watch_state: |
527159b7 | 1295 | if (debug_infrun) |
8a9de0e4 AC |
1296 | fprintf_unfiltered (gdb_stdlog, |
1297 | "infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 1298 | insert_breakpoints (); |
c906108c | 1299 | |
488f131b JB |
1300 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1301 | handle things like signals arriving and other things happening | |
1302 | in combination correctly? */ | |
1303 | stepped_after_stopped_by_watchpoint = 1; | |
1304 | break; | |
65e82032 AC |
1305 | |
1306 | default: | |
e2e0b3e5 | 1307 | internal_error (__FILE__, __LINE__, _("bad switch")); |
488f131b JB |
1308 | } |
1309 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1310 | |
488f131b | 1311 | flush_cached_frames (); |
c906108c | 1312 | |
488f131b | 1313 | /* If it's a new process, add it to the thread database */ |
c906108c | 1314 | |
488f131b | 1315 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
b9b5d7ea | 1316 | && !ptid_equal (ecs->ptid, minus_one_ptid) |
488f131b JB |
1317 | && !in_thread_list (ecs->ptid)); |
1318 | ||
1319 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1320 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1321 | { | |
1322 | add_thread (ecs->ptid); | |
c906108c | 1323 | |
488f131b JB |
1324 | ui_out_text (uiout, "[New "); |
1325 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); | |
1326 | ui_out_text (uiout, "]\n"); | |
488f131b | 1327 | } |
c906108c | 1328 | |
488f131b JB |
1329 | switch (ecs->ws.kind) |
1330 | { | |
1331 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 1332 | if (debug_infrun) |
8a9de0e4 | 1333 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
488f131b JB |
1334 | /* Ignore gracefully during startup of the inferior, as it |
1335 | might be the shell which has just loaded some objects, | |
1336 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1337 | #ifdef SOLIB_ADD |
c0236d92 | 1338 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b JB |
1339 | { |
1340 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1341 | breakpoint addresses via breakpoint_re_set. */ | |
1342 | if (breakpoints_inserted) | |
1343 | remove_breakpoints (); | |
c906108c | 1344 | |
488f131b JB |
1345 | /* Check for any newly added shared libraries if we're |
1346 | supposed to be adding them automatically. Switch | |
1347 | terminal for any messages produced by | |
1348 | breakpoint_re_set. */ | |
1349 | target_terminal_ours_for_output (); | |
aff6338a | 1350 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
1351 | stack's section table is kept up-to-date. Architectures, |
1352 | (e.g., PPC64), use the section table to perform | |
1353 | operations such as address => section name and hence | |
1354 | require the table to contain all sections (including | |
1355 | those found in shared libraries). */ | |
aff6338a | 1356 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
1357 | exec_ops to SOLIB_ADD. This is because current GDB is |
1358 | only tooled to propagate section_table changes out from | |
1359 | the "current_target" (see target_resize_to_sections), and | |
1360 | not up from the exec stratum. This, of course, isn't | |
1361 | right. "infrun.c" should only interact with the | |
1362 | exec/process stratum, instead relying on the target stack | |
1363 | to propagate relevant changes (stop, section table | |
1364 | changed, ...) up to other layers. */ | |
aff6338a | 1365 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
488f131b JB |
1366 | target_terminal_inferior (); |
1367 | ||
1368 | /* Reinsert breakpoints and continue. */ | |
1369 | if (breakpoints_inserted) | |
1370 | insert_breakpoints (); | |
1371 | } | |
c906108c | 1372 | #endif |
488f131b JB |
1373 | resume (0, TARGET_SIGNAL_0); |
1374 | prepare_to_wait (ecs); | |
1375 | return; | |
c5aa993b | 1376 | |
488f131b | 1377 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 1378 | if (debug_infrun) |
8a9de0e4 | 1379 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
488f131b JB |
1380 | resume (0, TARGET_SIGNAL_0); |
1381 | prepare_to_wait (ecs); | |
1382 | return; | |
c5aa993b | 1383 | |
488f131b | 1384 | case TARGET_WAITKIND_EXITED: |
527159b7 | 1385 | if (debug_infrun) |
8a9de0e4 | 1386 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n"); |
488f131b JB |
1387 | target_terminal_ours (); /* Must do this before mourn anyway */ |
1388 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
1389 | ||
1390 | /* Record the exit code in the convenience variable $_exitcode, so | |
1391 | that the user can inspect this again later. */ | |
1392 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1393 | value_from_longest (builtin_type_int, | |
1394 | (LONGEST) ecs->ws.value.integer)); | |
1395 | gdb_flush (gdb_stdout); | |
1396 | target_mourn_inferior (); | |
1397 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1398 | stop_print_frame = 0; | |
1399 | stop_stepping (ecs); | |
1400 | return; | |
c5aa993b | 1401 | |
488f131b | 1402 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 1403 | if (debug_infrun) |
8a9de0e4 | 1404 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n"); |
488f131b JB |
1405 | stop_print_frame = 0; |
1406 | stop_signal = ecs->ws.value.sig; | |
1407 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1408 | |
488f131b JB |
1409 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1410 | reach here unless the inferior is dead. However, for years | |
1411 | target_kill() was called here, which hints that fatal signals aren't | |
1412 | really fatal on some systems. If that's true, then some changes | |
1413 | may be needed. */ | |
1414 | target_mourn_inferior (); | |
c906108c | 1415 | |
488f131b JB |
1416 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
1417 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1418 | stop_stepping (ecs); | |
1419 | return; | |
c906108c | 1420 | |
488f131b JB |
1421 | /* The following are the only cases in which we keep going; |
1422 | the above cases end in a continue or goto. */ | |
1423 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 1424 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 1425 | if (debug_infrun) |
8a9de0e4 | 1426 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); |
488f131b JB |
1427 | stop_signal = TARGET_SIGNAL_TRAP; |
1428 | pending_follow.kind = ecs->ws.kind; | |
1429 | ||
8e7d2c16 DJ |
1430 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
1431 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c | 1432 | |
5a2901d9 DJ |
1433 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
1434 | { | |
1435 | context_switch (ecs); | |
1436 | flush_cached_frames (); | |
1437 | } | |
1438 | ||
488f131b | 1439 | stop_pc = read_pc (); |
675bf4cb | 1440 | |
00d4360e | 1441 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1442 | |
488f131b | 1443 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
04e68871 DJ |
1444 | |
1445 | /* If no catchpoint triggered for this, then keep going. */ | |
1446 | if (ecs->random_signal) | |
1447 | { | |
1448 | stop_signal = TARGET_SIGNAL_0; | |
1449 | keep_going (ecs); | |
1450 | return; | |
1451 | } | |
488f131b JB |
1452 | goto process_event_stop_test; |
1453 | ||
1454 | case TARGET_WAITKIND_EXECD: | |
527159b7 | 1455 | if (debug_infrun) |
fc5261f2 | 1456 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b JB |
1457 | stop_signal = TARGET_SIGNAL_TRAP; |
1458 | ||
7d2830a3 | 1459 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
8fb3e588 AC |
1460 | target_wait function. Until then following vfork on HP/UX 10.20 |
1461 | is probably broken by this. Of course, it's broken anyway. */ | |
488f131b JB |
1462 | /* Is this a target which reports multiple exec events per actual |
1463 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1464 | ignore all but the last one. Just resume the exec'r, and wait | |
1465 | for the next exec event. */ | |
1466 | if (inferior_ignoring_leading_exec_events) | |
1467 | { | |
1468 | inferior_ignoring_leading_exec_events--; | |
488f131b JB |
1469 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); |
1470 | prepare_to_wait (ecs); | |
1471 | return; | |
1472 | } | |
1473 | inferior_ignoring_leading_exec_events = | |
1474 | target_reported_exec_events_per_exec_call () - 1; | |
1475 | ||
1476 | pending_follow.execd_pathname = | |
1477 | savestring (ecs->ws.value.execd_pathname, | |
1478 | strlen (ecs->ws.value.execd_pathname)); | |
1479 | ||
488f131b JB |
1480 | /* This causes the eventpoints and symbol table to be reset. Must |
1481 | do this now, before trying to determine whether to stop. */ | |
1482 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); | |
1483 | xfree (pending_follow.execd_pathname); | |
c906108c | 1484 | |
488f131b JB |
1485 | stop_pc = read_pc_pid (ecs->ptid); |
1486 | ecs->saved_inferior_ptid = inferior_ptid; | |
1487 | inferior_ptid = ecs->ptid; | |
675bf4cb | 1488 | |
00d4360e | 1489 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1490 | |
488f131b JB |
1491 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1492 | inferior_ptid = ecs->saved_inferior_ptid; | |
04e68871 | 1493 | |
5a2901d9 DJ |
1494 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
1495 | { | |
1496 | context_switch (ecs); | |
1497 | flush_cached_frames (); | |
1498 | } | |
1499 | ||
04e68871 DJ |
1500 | /* If no catchpoint triggered for this, then keep going. */ |
1501 | if (ecs->random_signal) | |
1502 | { | |
1503 | stop_signal = TARGET_SIGNAL_0; | |
1504 | keep_going (ecs); | |
1505 | return; | |
1506 | } | |
488f131b JB |
1507 | goto process_event_stop_test; |
1508 | ||
b4dc5ffa MK |
1509 | /* Be careful not to try to gather much state about a thread |
1510 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 1511 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 1512 | if (debug_infrun) |
8a9de0e4 | 1513 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); |
488f131b JB |
1514 | resume (0, TARGET_SIGNAL_0); |
1515 | prepare_to_wait (ecs); | |
1516 | return; | |
c906108c | 1517 | |
488f131b JB |
1518 | /* Before examining the threads further, step this thread to |
1519 | get it entirely out of the syscall. (We get notice of the | |
1520 | event when the thread is just on the verge of exiting a | |
1521 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 1522 | into user code.) */ |
488f131b | 1523 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 1524 | if (debug_infrun) |
8a9de0e4 | 1525 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); |
488f131b | 1526 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
488f131b JB |
1527 | prepare_to_wait (ecs); |
1528 | return; | |
c906108c | 1529 | |
488f131b | 1530 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 1531 | if (debug_infrun) |
8a9de0e4 | 1532 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
488f131b JB |
1533 | stop_signal = ecs->ws.value.sig; |
1534 | break; | |
c906108c | 1535 | |
488f131b JB |
1536 | /* We had an event in the inferior, but we are not interested |
1537 | in handling it at this level. The lower layers have already | |
8e7d2c16 | 1538 | done what needs to be done, if anything. |
8fb3e588 AC |
1539 | |
1540 | One of the possible circumstances for this is when the | |
1541 | inferior produces output for the console. The inferior has | |
1542 | not stopped, and we are ignoring the event. Another possible | |
1543 | circumstance is any event which the lower level knows will be | |
1544 | reported multiple times without an intervening resume. */ | |
488f131b | 1545 | case TARGET_WAITKIND_IGNORE: |
527159b7 | 1546 | if (debug_infrun) |
8a9de0e4 | 1547 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); |
8e7d2c16 | 1548 | prepare_to_wait (ecs); |
488f131b JB |
1549 | return; |
1550 | } | |
c906108c | 1551 | |
488f131b JB |
1552 | /* We may want to consider not doing a resume here in order to give |
1553 | the user a chance to play with the new thread. It might be good | |
1554 | to make that a user-settable option. */ | |
c906108c | 1555 | |
488f131b JB |
1556 | /* At this point, all threads are stopped (happens automatically in |
1557 | either the OS or the native code). Therefore we need to continue | |
1558 | all threads in order to make progress. */ | |
1559 | if (ecs->new_thread_event) | |
1560 | { | |
1561 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1562 | prepare_to_wait (ecs); | |
1563 | return; | |
1564 | } | |
c906108c | 1565 | |
488f131b JB |
1566 | stop_pc = read_pc_pid (ecs->ptid); |
1567 | ||
527159b7 | 1568 | if (debug_infrun) |
8a9de0e4 | 1569 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", paddr_nz (stop_pc)); |
527159b7 | 1570 | |
9f976b41 DJ |
1571 | if (stepping_past_singlestep_breakpoint) |
1572 | { | |
8fb3e588 AC |
1573 | gdb_assert (SOFTWARE_SINGLE_STEP_P () |
1574 | && singlestep_breakpoints_inserted_p); | |
9f976b41 DJ |
1575 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
1576 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
1577 | ||
1578 | stepping_past_singlestep_breakpoint = 0; | |
1579 | ||
1580 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
1581 | breakpoint, or stopped for some other reason. It would be nice if |
1582 | we could tell, but we can't reliably. */ | |
9f976b41 | 1583 | if (stop_signal == TARGET_SIGNAL_TRAP) |
8fb3e588 | 1584 | { |
527159b7 | 1585 | if (debug_infrun) |
8a9de0e4 | 1586 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n"); |
9f976b41 DJ |
1587 | /* Pull the single step breakpoints out of the target. */ |
1588 | SOFTWARE_SINGLE_STEP (0, 0); | |
1589 | singlestep_breakpoints_inserted_p = 0; | |
1590 | ||
1591 | ecs->random_signal = 0; | |
1592 | ||
1593 | ecs->ptid = saved_singlestep_ptid; | |
1594 | context_switch (ecs); | |
9a4105ab AC |
1595 | if (deprecated_context_hook) |
1596 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
1597 | |
1598 | resume (1, TARGET_SIGNAL_0); | |
1599 | prepare_to_wait (ecs); | |
1600 | return; | |
1601 | } | |
1602 | } | |
1603 | ||
1604 | stepping_past_singlestep_breakpoint = 0; | |
1605 | ||
488f131b JB |
1606 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1607 | another thread. If so, then step that thread past the breakpoint, | |
1608 | and continue it. */ | |
1609 | ||
1610 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1611 | { | |
9f976b41 DJ |
1612 | int thread_hop_needed = 0; |
1613 | ||
f8d40ec8 JB |
1614 | /* Check if a regular breakpoint has been hit before checking |
1615 | for a potential single step breakpoint. Otherwise, GDB will | |
1616 | not see this breakpoint hit when stepping onto breakpoints. */ | |
4fa8626c | 1617 | if (breakpoints_inserted && breakpoint_here_p (stop_pc)) |
488f131b | 1618 | { |
c5aa993b | 1619 | ecs->random_signal = 0; |
4fa8626c | 1620 | if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
9f976b41 DJ |
1621 | thread_hop_needed = 1; |
1622 | } | |
1623 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
1624 | { | |
fd48f117 DJ |
1625 | /* We have not context switched yet, so this should be true |
1626 | no matter which thread hit the singlestep breakpoint. */ | |
1627 | gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid)); | |
1628 | if (debug_infrun) | |
1629 | fprintf_unfiltered (gdb_stdlog, "infrun: software single step " | |
1630 | "trap for %s\n", | |
1631 | target_pid_to_str (ecs->ptid)); | |
1632 | ||
9f976b41 DJ |
1633 | ecs->random_signal = 0; |
1634 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
1635 | change when we go from single-threaded to multi-threaded. If | |
1636 | the singlestep_ptid is still in the list, assume that it is | |
1637 | really different from ecs->ptid. */ | |
1638 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
1639 | && in_thread_list (singlestep_ptid)) | |
1640 | { | |
fd48f117 DJ |
1641 | /* If the PC of the thread we were trying to single-step |
1642 | has changed, discard this event (which we were going | |
1643 | to ignore anyway), and pretend we saw that thread | |
1644 | trap. This prevents us continuously moving the | |
1645 | single-step breakpoint forward, one instruction at a | |
1646 | time. If the PC has changed, then the thread we were | |
1647 | trying to single-step has trapped or been signalled, | |
1648 | but the event has not been reported to GDB yet. | |
1649 | ||
1650 | There might be some cases where this loses signal | |
1651 | information, if a signal has arrived at exactly the | |
1652 | same time that the PC changed, but this is the best | |
1653 | we can do with the information available. Perhaps we | |
1654 | should arrange to report all events for all threads | |
1655 | when they stop, or to re-poll the remote looking for | |
1656 | this particular thread (i.e. temporarily enable | |
1657 | schedlock). */ | |
1658 | if (read_pc_pid (singlestep_ptid) != singlestep_pc) | |
1659 | { | |
1660 | if (debug_infrun) | |
1661 | fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread," | |
1662 | " but expected thread advanced also\n"); | |
1663 | ||
1664 | /* The current context still belongs to | |
1665 | singlestep_ptid. Don't swap here, since that's | |
1666 | the context we want to use. Just fudge our | |
1667 | state and continue. */ | |
1668 | ecs->ptid = singlestep_ptid; | |
1669 | stop_pc = read_pc_pid (ecs->ptid); | |
1670 | } | |
1671 | else | |
1672 | { | |
1673 | if (debug_infrun) | |
1674 | fprintf_unfiltered (gdb_stdlog, | |
1675 | "infrun: unexpected thread\n"); | |
1676 | ||
1677 | thread_hop_needed = 1; | |
1678 | stepping_past_singlestep_breakpoint = 1; | |
1679 | saved_singlestep_ptid = singlestep_ptid; | |
1680 | } | |
9f976b41 DJ |
1681 | } |
1682 | } | |
1683 | ||
1684 | if (thread_hop_needed) | |
8fb3e588 AC |
1685 | { |
1686 | int remove_status; | |
1687 | ||
527159b7 | 1688 | if (debug_infrun) |
8a9de0e4 | 1689 | fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); |
527159b7 | 1690 | |
8fb3e588 AC |
1691 | /* Saw a breakpoint, but it was hit by the wrong thread. |
1692 | Just continue. */ | |
1693 | ||
1694 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
488f131b | 1695 | { |
8fb3e588 AC |
1696 | /* Pull the single step breakpoints out of the target. */ |
1697 | SOFTWARE_SINGLE_STEP (0, 0); | |
1698 | singlestep_breakpoints_inserted_p = 0; | |
1699 | } | |
1700 | ||
1701 | remove_status = remove_breakpoints (); | |
1702 | /* Did we fail to remove breakpoints? If so, try | |
1703 | to set the PC past the bp. (There's at least | |
1704 | one situation in which we can fail to remove | |
1705 | the bp's: On HP-UX's that use ttrace, we can't | |
1706 | change the address space of a vforking child | |
1707 | process until the child exits (well, okay, not | |
1708 | then either :-) or execs. */ | |
1709 | if (remove_status != 0) | |
1710 | { | |
1711 | /* FIXME! This is obviously non-portable! */ | |
1712 | write_pc_pid (stop_pc + 4, ecs->ptid); | |
1713 | /* We need to restart all the threads now, | |
1714 | * unles we're running in scheduler-locked mode. | |
1715 | * Use currently_stepping to determine whether to | |
1716 | * step or continue. | |
1717 | */ | |
1718 | /* FIXME MVS: is there any reason not to call resume()? */ | |
1719 | if (scheduler_mode == schedlock_on) | |
1720 | target_resume (ecs->ptid, | |
1721 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
488f131b | 1722 | else |
8fb3e588 AC |
1723 | target_resume (RESUME_ALL, |
1724 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1725 | prepare_to_wait (ecs); | |
1726 | return; | |
1727 | } | |
1728 | else | |
1729 | { /* Single step */ | |
1730 | breakpoints_inserted = 0; | |
1731 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
1732 | context_switch (ecs); | |
1733 | ecs->waiton_ptid = ecs->ptid; | |
1734 | ecs->wp = &(ecs->ws); | |
1735 | ecs->another_trap = 1; | |
1736 | ||
1737 | ecs->infwait_state = infwait_thread_hop_state; | |
1738 | keep_going (ecs); | |
1739 | registers_changed (); | |
1740 | return; | |
1741 | } | |
488f131b | 1742 | } |
f8d40ec8 | 1743 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
8fb3e588 AC |
1744 | { |
1745 | sw_single_step_trap_p = 1; | |
1746 | ecs->random_signal = 0; | |
1747 | } | |
488f131b JB |
1748 | } |
1749 | else | |
1750 | ecs->random_signal = 1; | |
c906108c | 1751 | |
488f131b | 1752 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
1753 | so, then switch to that thread. */ |
1754 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 1755 | { |
527159b7 | 1756 | if (debug_infrun) |
8a9de0e4 | 1757 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 1758 | |
488f131b | 1759 | context_switch (ecs); |
c5aa993b | 1760 | |
9a4105ab AC |
1761 | if (deprecated_context_hook) |
1762 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 1763 | } |
c906108c | 1764 | |
488f131b JB |
1765 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1766 | { | |
1767 | /* Pull the single step breakpoints out of the target. */ | |
1768 | SOFTWARE_SINGLE_STEP (0, 0); | |
1769 | singlestep_breakpoints_inserted_p = 0; | |
1770 | } | |
c906108c | 1771 | |
488f131b JB |
1772 | /* It may not be necessary to disable the watchpoint to stop over |
1773 | it. For example, the PA can (with some kernel cooperation) | |
1774 | single step over a watchpoint without disabling the watchpoint. */ | |
1775 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1776 | { | |
527159b7 | 1777 | if (debug_infrun) |
8a9de0e4 | 1778 | fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n"); |
488f131b JB |
1779 | resume (1, 0); |
1780 | prepare_to_wait (ecs); | |
1781 | return; | |
1782 | } | |
c906108c | 1783 | |
488f131b JB |
1784 | /* It is far more common to need to disable a watchpoint to step |
1785 | the inferior over it. FIXME. What else might a debug | |
1786 | register or page protection watchpoint scheme need here? */ | |
1787 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1788 | { | |
1789 | /* At this point, we are stopped at an instruction which has | |
1790 | attempted to write to a piece of memory under control of | |
1791 | a watchpoint. The instruction hasn't actually executed | |
1792 | yet. If we were to evaluate the watchpoint expression | |
1793 | now, we would get the old value, and therefore no change | |
1794 | would seem to have occurred. | |
1795 | ||
1796 | In order to make watchpoints work `right', we really need | |
1797 | to complete the memory write, and then evaluate the | |
1798 | watchpoint expression. The following code does that by | |
1799 | removing the watchpoint (actually, all watchpoints and | |
1800 | breakpoints), single-stepping the target, re-inserting | |
1801 | watchpoints, and then falling through to let normal | |
1802 | single-step processing handle proceed. Since this | |
1803 | includes evaluating watchpoints, things will come to a | |
1804 | stop in the correct manner. */ | |
1805 | ||
527159b7 | 1806 | if (debug_infrun) |
8a9de0e4 | 1807 | fprintf_unfiltered (gdb_stdlog, "infrun: STOPPED_BY_WATCHPOINT\n"); |
488f131b JB |
1808 | remove_breakpoints (); |
1809 | registers_changed (); | |
1810 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
c5aa993b | 1811 | |
488f131b JB |
1812 | ecs->waiton_ptid = ecs->ptid; |
1813 | ecs->wp = &(ecs->ws); | |
1814 | ecs->infwait_state = infwait_nonstep_watch_state; | |
1815 | prepare_to_wait (ecs); | |
1816 | return; | |
1817 | } | |
1818 | ||
1819 | /* It may be possible to simply continue after a watchpoint. */ | |
1820 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
00d4360e | 1821 | stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws); |
488f131b JB |
1822 | |
1823 | ecs->stop_func_start = 0; | |
1824 | ecs->stop_func_end = 0; | |
1825 | ecs->stop_func_name = 0; | |
1826 | /* Don't care about return value; stop_func_start and stop_func_name | |
1827 | will both be 0 if it doesn't work. */ | |
1828 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
1829 | &ecs->stop_func_start, &ecs->stop_func_end); | |
782263ab | 1830 | ecs->stop_func_start += DEPRECATED_FUNCTION_START_OFFSET; |
488f131b JB |
1831 | ecs->another_trap = 0; |
1832 | bpstat_clear (&stop_bpstat); | |
1833 | stop_step = 0; | |
1834 | stop_stack_dummy = 0; | |
1835 | stop_print_frame = 1; | |
1836 | ecs->random_signal = 0; | |
1837 | stopped_by_random_signal = 0; | |
1838 | breakpoints_failed = 0; | |
1839 | ||
3352ef37 AC |
1840 | if (stop_signal == TARGET_SIGNAL_TRAP |
1841 | && trap_expected | |
1842 | && gdbarch_single_step_through_delay_p (current_gdbarch) | |
1843 | && currently_stepping (ecs)) | |
1844 | { | |
1845 | /* We're trying to step of a breakpoint. Turns out that we're | |
1846 | also on an instruction that needs to be stepped multiple | |
1847 | times before it's been fully executing. E.g., architectures | |
1848 | with a delay slot. It needs to be stepped twice, once for | |
1849 | the instruction and once for the delay slot. */ | |
1850 | int step_through_delay | |
1851 | = gdbarch_single_step_through_delay (current_gdbarch, | |
1852 | get_current_frame ()); | |
527159b7 | 1853 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 1854 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
3352ef37 AC |
1855 | if (step_range_end == 0 && step_through_delay) |
1856 | { | |
1857 | /* The user issued a continue when stopped at a breakpoint. | |
1858 | Set up for another trap and get out of here. */ | |
1859 | ecs->another_trap = 1; | |
1860 | keep_going (ecs); | |
1861 | return; | |
1862 | } | |
1863 | else if (step_through_delay) | |
1864 | { | |
1865 | /* The user issued a step when stopped at a breakpoint. | |
1866 | Maybe we should stop, maybe we should not - the delay | |
1867 | slot *might* correspond to a line of source. In any | |
1868 | case, don't decide that here, just set ecs->another_trap, | |
1869 | making sure we single-step again before breakpoints are | |
1870 | re-inserted. */ | |
1871 | ecs->another_trap = 1; | |
1872 | } | |
1873 | } | |
1874 | ||
488f131b JB |
1875 | /* Look at the cause of the stop, and decide what to do. |
1876 | The alternatives are: | |
1877 | 1) break; to really stop and return to the debugger, | |
1878 | 2) drop through to start up again | |
1879 | (set ecs->another_trap to 1 to single step once) | |
1880 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
1881 | will be made according to the signal handling tables. */ | |
1882 | ||
1883 | /* First, distinguish signals caused by the debugger from signals | |
03cebad2 MK |
1884 | that have to do with the program's own actions. Note that |
1885 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
1886 | on the operating system version. Here we detect when a SIGILL or | |
1887 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
1888 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
1889 | when we're trying to execute a breakpoint instruction on a | |
1890 | non-executable stack. This happens for call dummy breakpoints | |
1891 | for architectures like SPARC that place call dummies on the | |
1892 | stack. */ | |
488f131b JB |
1893 | |
1894 | if (stop_signal == TARGET_SIGNAL_TRAP | |
8fb3e588 AC |
1895 | || (breakpoints_inserted |
1896 | && (stop_signal == TARGET_SIGNAL_ILL | |
1897 | || stop_signal == TARGET_SIGNAL_SEGV | |
1898 | || stop_signal == TARGET_SIGNAL_EMT)) | |
1899 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP) | |
488f131b JB |
1900 | { |
1901 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1902 | { | |
527159b7 | 1903 | if (debug_infrun) |
8a9de0e4 | 1904 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); |
488f131b JB |
1905 | stop_print_frame = 0; |
1906 | stop_stepping (ecs); | |
1907 | return; | |
1908 | } | |
c54cfec8 EZ |
1909 | |
1910 | /* This is originated from start_remote(), start_inferior() and | |
1911 | shared libraries hook functions. */ | |
c0236d92 | 1912 | if (stop_soon == STOP_QUIETLY) |
488f131b | 1913 | { |
527159b7 | 1914 | if (debug_infrun) |
8a9de0e4 | 1915 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); |
488f131b JB |
1916 | stop_stepping (ecs); |
1917 | return; | |
1918 | } | |
1919 | ||
c54cfec8 EZ |
1920 | /* This originates from attach_command(). We need to overwrite |
1921 | the stop_signal here, because some kernels don't ignore a | |
1922 | SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call. | |
1923 | See more comments in inferior.h. */ | |
c0236d92 | 1924 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
c54cfec8 EZ |
1925 | { |
1926 | stop_stepping (ecs); | |
1927 | if (stop_signal == TARGET_SIGNAL_STOP) | |
1928 | stop_signal = TARGET_SIGNAL_0; | |
1929 | return; | |
1930 | } | |
1931 | ||
d303a6c7 AC |
1932 | /* Don't even think about breakpoints if just proceeded over a |
1933 | breakpoint. */ | |
1934 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected) | |
527159b7 RC |
1935 | { |
1936 | if (debug_infrun) | |
8a9de0e4 | 1937 | fprintf_unfiltered (gdb_stdlog, "infrun: trap expected\n"); |
527159b7 RC |
1938 | bpstat_clear (&stop_bpstat); |
1939 | } | |
488f131b JB |
1940 | else |
1941 | { | |
1942 | /* See if there is a breakpoint at the current PC. */ | |
8fb3e588 | 1943 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, |
00d4360e | 1944 | stopped_by_watchpoint); |
488f131b | 1945 | |
488f131b JB |
1946 | /* Following in case break condition called a |
1947 | function. */ | |
1948 | stop_print_frame = 1; | |
1949 | } | |
1950 | ||
73dd234f | 1951 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
1952 | at one stage in the past included checks for an inferior |
1953 | function call's call dummy's return breakpoint. The original | |
1954 | comment, that went with the test, read: | |
73dd234f | 1955 | |
8fb3e588 AC |
1956 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
1957 | another signal besides SIGTRAP, so check here as well as | |
1958 | above.'' | |
73dd234f AC |
1959 | |
1960 | If someone ever tries to get get call dummys on a | |
1961 | non-executable stack to work (where the target would stop | |
03cebad2 MK |
1962 | with something like a SIGSEGV), then those tests might need |
1963 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 1964 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
1965 | suspect that it won't be the case. |
1966 | ||
8fb3e588 AC |
1967 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
1968 | be necessary for call dummies on a non-executable stack on | |
1969 | SPARC. */ | |
73dd234f | 1970 | |
488f131b JB |
1971 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1972 | ecs->random_signal | |
1973 | = !(bpstat_explains_signal (stop_bpstat) | |
1974 | || trap_expected | |
488f131b | 1975 | || (step_range_end && step_resume_breakpoint == NULL)); |
488f131b JB |
1976 | else |
1977 | { | |
73dd234f | 1978 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
488f131b JB |
1979 | if (!ecs->random_signal) |
1980 | stop_signal = TARGET_SIGNAL_TRAP; | |
1981 | } | |
1982 | } | |
1983 | ||
1984 | /* When we reach this point, we've pretty much decided | |
1985 | that the reason for stopping must've been a random | |
1986 | (unexpected) signal. */ | |
1987 | ||
1988 | else | |
1989 | ecs->random_signal = 1; | |
488f131b | 1990 | |
04e68871 | 1991 | process_event_stop_test: |
488f131b JB |
1992 | /* For the program's own signals, act according to |
1993 | the signal handling tables. */ | |
1994 | ||
1995 | if (ecs->random_signal) | |
1996 | { | |
1997 | /* Signal not for debugging purposes. */ | |
1998 | int printed = 0; | |
1999 | ||
527159b7 | 2000 | if (debug_infrun) |
8a9de0e4 | 2001 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", stop_signal); |
527159b7 | 2002 | |
488f131b JB |
2003 | stopped_by_random_signal = 1; |
2004 | ||
2005 | if (signal_print[stop_signal]) | |
2006 | { | |
2007 | printed = 1; | |
2008 | target_terminal_ours_for_output (); | |
2009 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
2010 | } | |
2011 | if (signal_stop[stop_signal]) | |
2012 | { | |
2013 | stop_stepping (ecs); | |
2014 | return; | |
2015 | } | |
2016 | /* If not going to stop, give terminal back | |
2017 | if we took it away. */ | |
2018 | else if (printed) | |
2019 | target_terminal_inferior (); | |
2020 | ||
2021 | /* Clear the signal if it should not be passed. */ | |
2022 | if (signal_program[stop_signal] == 0) | |
2023 | stop_signal = TARGET_SIGNAL_0; | |
2024 | ||
68f53502 AC |
2025 | if (prev_pc == read_pc () |
2026 | && !breakpoints_inserted | |
2027 | && breakpoint_here_p (read_pc ()) | |
2028 | && step_resume_breakpoint == NULL) | |
2029 | { | |
2030 | /* We were just starting a new sequence, attempting to | |
2031 | single-step off of a breakpoint and expecting a SIGTRAP. | |
2032 | Intead this signal arrives. This signal will take us out | |
2033 | of the stepping range so GDB needs to remember to, when | |
2034 | the signal handler returns, resume stepping off that | |
2035 | breakpoint. */ | |
2036 | /* To simplify things, "continue" is forced to use the same | |
2037 | code paths as single-step - set a breakpoint at the | |
2038 | signal return address and then, once hit, step off that | |
2039 | breakpoint. */ | |
44cbf7b5 | 2040 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
68f53502 | 2041 | ecs->step_after_step_resume_breakpoint = 1; |
9d799f85 AC |
2042 | keep_going (ecs); |
2043 | return; | |
68f53502 | 2044 | } |
9d799f85 AC |
2045 | |
2046 | if (step_range_end != 0 | |
2047 | && stop_signal != TARGET_SIGNAL_0 | |
2048 | && stop_pc >= step_range_start && stop_pc < step_range_end | |
2049 | && frame_id_eq (get_frame_id (get_current_frame ()), | |
2050 | step_frame_id) | |
2051 | && step_resume_breakpoint == NULL) | |
d303a6c7 AC |
2052 | { |
2053 | /* The inferior is about to take a signal that will take it | |
2054 | out of the single step range. Set a breakpoint at the | |
2055 | current PC (which is presumably where the signal handler | |
2056 | will eventually return) and then allow the inferior to | |
2057 | run free. | |
2058 | ||
2059 | Note that this is only needed for a signal delivered | |
2060 | while in the single-step range. Nested signals aren't a | |
2061 | problem as they eventually all return. */ | |
44cbf7b5 | 2062 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
9d799f85 AC |
2063 | keep_going (ecs); |
2064 | return; | |
d303a6c7 | 2065 | } |
9d799f85 AC |
2066 | |
2067 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
2068 | when either there's a nested signal, or when there's a | |
2069 | pending signal enabled just as the signal handler returns | |
2070 | (leaving the inferior at the step-resume-breakpoint without | |
2071 | actually executing it). Either way continue until the | |
2072 | breakpoint is really hit. */ | |
488f131b JB |
2073 | keep_going (ecs); |
2074 | return; | |
2075 | } | |
2076 | ||
2077 | /* Handle cases caused by hitting a breakpoint. */ | |
2078 | { | |
2079 | CORE_ADDR jmp_buf_pc; | |
2080 | struct bpstat_what what; | |
2081 | ||
2082 | what = bpstat_what (stop_bpstat); | |
2083 | ||
2084 | if (what.call_dummy) | |
2085 | { | |
2086 | stop_stack_dummy = 1; | |
c5aa993b | 2087 | } |
c906108c | 2088 | |
488f131b | 2089 | switch (what.main_action) |
c5aa993b | 2090 | { |
488f131b JB |
2091 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2092 | /* If we hit the breakpoint at longjmp, disable it for the | |
2093 | duration of this command. Then, install a temporary | |
2094 | breakpoint at the target of the jmp_buf. */ | |
527159b7 | 2095 | if (debug_infrun) |
8802d8ed | 2096 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); |
488f131b JB |
2097 | disable_longjmp_breakpoint (); |
2098 | remove_breakpoints (); | |
2099 | breakpoints_inserted = 0; | |
2100 | if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
c5aa993b | 2101 | { |
488f131b | 2102 | keep_going (ecs); |
104c1213 | 2103 | return; |
c5aa993b | 2104 | } |
488f131b JB |
2105 | |
2106 | /* Need to blow away step-resume breakpoint, as it | |
2107 | interferes with us */ | |
2108 | if (step_resume_breakpoint != NULL) | |
104c1213 | 2109 | { |
488f131b | 2110 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
104c1213 | 2111 | } |
c906108c | 2112 | |
8fb3e588 | 2113 | set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
488f131b JB |
2114 | ecs->handling_longjmp = 1; /* FIXME */ |
2115 | keep_going (ecs); | |
2116 | return; | |
c906108c | 2117 | |
488f131b JB |
2118 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2119 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
527159b7 | 2120 | if (debug_infrun) |
8802d8ed | 2121 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); |
488f131b JB |
2122 | remove_breakpoints (); |
2123 | breakpoints_inserted = 0; | |
488f131b JB |
2124 | disable_longjmp_breakpoint (); |
2125 | ecs->handling_longjmp = 0; /* FIXME */ | |
2126 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2127 | break; | |
2128 | /* else fallthrough */ | |
2129 | ||
2130 | case BPSTAT_WHAT_SINGLE: | |
527159b7 | 2131 | if (debug_infrun) |
8802d8ed | 2132 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); |
488f131b | 2133 | if (breakpoints_inserted) |
c5aa993b | 2134 | { |
488f131b | 2135 | remove_breakpoints (); |
c5aa993b | 2136 | } |
488f131b JB |
2137 | breakpoints_inserted = 0; |
2138 | ecs->another_trap = 1; | |
2139 | /* Still need to check other stuff, at least the case | |
2140 | where we are stepping and step out of the right range. */ | |
2141 | break; | |
c906108c | 2142 | |
488f131b | 2143 | case BPSTAT_WHAT_STOP_NOISY: |
527159b7 | 2144 | if (debug_infrun) |
8802d8ed | 2145 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); |
488f131b | 2146 | stop_print_frame = 1; |
c906108c | 2147 | |
d303a6c7 AC |
2148 | /* We are about to nuke the step_resume_breakpointt via the |
2149 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2150 | |
488f131b JB |
2151 | stop_stepping (ecs); |
2152 | return; | |
c5aa993b | 2153 | |
488f131b | 2154 | case BPSTAT_WHAT_STOP_SILENT: |
527159b7 | 2155 | if (debug_infrun) |
8802d8ed | 2156 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); |
488f131b | 2157 | stop_print_frame = 0; |
c5aa993b | 2158 | |
d303a6c7 AC |
2159 | /* We are about to nuke the step_resume_breakpoin via the |
2160 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2161 | |
488f131b | 2162 | stop_stepping (ecs); |
e441088d | 2163 | return; |
c5aa993b | 2164 | |
488f131b JB |
2165 | case BPSTAT_WHAT_STEP_RESUME: |
2166 | /* This proably demands a more elegant solution, but, yeah | |
2167 | right... | |
c5aa993b | 2168 | |
488f131b JB |
2169 | This function's use of the simple variable |
2170 | step_resume_breakpoint doesn't seem to accomodate | |
2171 | simultaneously active step-resume bp's, although the | |
2172 | breakpoint list certainly can. | |
c5aa993b | 2173 | |
488f131b JB |
2174 | If we reach here and step_resume_breakpoint is already |
2175 | NULL, then apparently we have multiple active | |
2176 | step-resume bp's. We'll just delete the breakpoint we | |
2177 | stopped at, and carry on. | |
2178 | ||
2179 | Correction: what the code currently does is delete a | |
2180 | step-resume bp, but it makes no effort to ensure that | |
2181 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2182 | |
527159b7 | 2183 | if (debug_infrun) |
8802d8ed | 2184 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); |
527159b7 | 2185 | |
488f131b JB |
2186 | if (step_resume_breakpoint == NULL) |
2187 | { | |
2188 | step_resume_breakpoint = | |
2189 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2190 | } | |
2191 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
68f53502 AC |
2192 | if (ecs->step_after_step_resume_breakpoint) |
2193 | { | |
2194 | /* Back when the step-resume breakpoint was inserted, we | |
2195 | were trying to single-step off a breakpoint. Go back | |
2196 | to doing that. */ | |
2197 | ecs->step_after_step_resume_breakpoint = 0; | |
2198 | remove_breakpoints (); | |
2199 | breakpoints_inserted = 0; | |
2200 | ecs->another_trap = 1; | |
2201 | keep_going (ecs); | |
2202 | return; | |
2203 | } | |
488f131b JB |
2204 | break; |
2205 | ||
2206 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
527159b7 | 2207 | if (debug_infrun) |
8802d8ed | 2208 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_THROUGH_SIGTRAMP\n"); |
488f131b JB |
2209 | /* If were waiting for a trap, hitting the step_resume_break |
2210 | doesn't count as getting it. */ | |
2211 | if (trap_expected) | |
2212 | ecs->another_trap = 1; | |
2213 | break; | |
2214 | ||
2215 | case BPSTAT_WHAT_CHECK_SHLIBS: | |
2216 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
c906108c | 2217 | { |
527159b7 | 2218 | if (debug_infrun) |
8802d8ed | 2219 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n"); |
488f131b JB |
2220 | /* Remove breakpoints, we eventually want to step over the |
2221 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2222 | breakpoint addresses via breakpoint_re_set. */ | |
2223 | if (breakpoints_inserted) | |
2224 | remove_breakpoints (); | |
c5aa993b | 2225 | breakpoints_inserted = 0; |
488f131b JB |
2226 | |
2227 | /* Check for any newly added shared libraries if we're | |
2228 | supposed to be adding them automatically. Switch | |
2229 | terminal for any messages produced by | |
2230 | breakpoint_re_set. */ | |
2231 | target_terminal_ours_for_output (); | |
aff6338a | 2232 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
2233 | stack's section table is kept up-to-date. Architectures, |
2234 | (e.g., PPC64), use the section table to perform | |
2235 | operations such as address => section name and hence | |
2236 | require the table to contain all sections (including | |
2237 | those found in shared libraries). */ | |
aff6338a | 2238 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
2239 | exec_ops to SOLIB_ADD. This is because current GDB is |
2240 | only tooled to propagate section_table changes out from | |
2241 | the "current_target" (see target_resize_to_sections), and | |
2242 | not up from the exec stratum. This, of course, isn't | |
2243 | right. "infrun.c" should only interact with the | |
2244 | exec/process stratum, instead relying on the target stack | |
2245 | to propagate relevant changes (stop, section table | |
2246 | changed, ...) up to other layers. */ | |
a77053c2 | 2247 | #ifdef SOLIB_ADD |
aff6338a | 2248 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
a77053c2 MK |
2249 | #else |
2250 | solib_add (NULL, 0, ¤t_target, auto_solib_add); | |
2251 | #endif | |
488f131b JB |
2252 | target_terminal_inferior (); |
2253 | ||
2254 | /* Try to reenable shared library breakpoints, additional | |
2255 | code segments in shared libraries might be mapped in now. */ | |
2256 | re_enable_breakpoints_in_shlibs (); | |
2257 | ||
2258 | /* If requested, stop when the dynamic linker notifies | |
2259 | gdb of events. This allows the user to get control | |
2260 | and place breakpoints in initializer routines for | |
2261 | dynamically loaded objects (among other things). */ | |
877522db | 2262 | if (stop_on_solib_events || stop_stack_dummy) |
d4f3574e | 2263 | { |
488f131b | 2264 | stop_stepping (ecs); |
d4f3574e SS |
2265 | return; |
2266 | } | |
c5aa993b | 2267 | |
488f131b JB |
2268 | /* If we stopped due to an explicit catchpoint, then the |
2269 | (see above) call to SOLIB_ADD pulled in any symbols | |
2270 | from a newly-loaded library, if appropriate. | |
2271 | ||
2272 | We do want the inferior to stop, but not where it is | |
2273 | now, which is in the dynamic linker callback. Rather, | |
2274 | we would like it stop in the user's program, just after | |
2275 | the call that caused this catchpoint to trigger. That | |
2276 | gives the user a more useful vantage from which to | |
2277 | examine their program's state. */ | |
8fb3e588 AC |
2278 | else if (what.main_action |
2279 | == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
c906108c | 2280 | { |
488f131b JB |
2281 | /* ??rehrauer: If I could figure out how to get the |
2282 | right return PC from here, we could just set a temp | |
2283 | breakpoint and resume. I'm not sure we can without | |
2284 | cracking open the dld's shared libraries and sniffing | |
2285 | their unwind tables and text/data ranges, and that's | |
2286 | not a terribly portable notion. | |
2287 | ||
2288 | Until that time, we must step the inferior out of the | |
2289 | dld callback, and also out of the dld itself (and any | |
2290 | code or stubs in libdld.sl, such as "shl_load" and | |
2291 | friends) until we reach non-dld code. At that point, | |
2292 | we can stop stepping. */ | |
2293 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2294 | &ecs-> | |
2295 | stepping_through_solib_catchpoints); | |
2296 | ecs->stepping_through_solib_after_catch = 1; | |
2297 | ||
2298 | /* Be sure to lift all breakpoints, so the inferior does | |
2299 | actually step past this point... */ | |
2300 | ecs->another_trap = 1; | |
2301 | break; | |
c906108c | 2302 | } |
c5aa993b | 2303 | else |
c5aa993b | 2304 | { |
488f131b | 2305 | /* We want to step over this breakpoint, then keep going. */ |
c5aa993b | 2306 | ecs->another_trap = 1; |
488f131b | 2307 | break; |
c5aa993b | 2308 | } |
488f131b | 2309 | } |
488f131b | 2310 | break; |
c906108c | 2311 | |
488f131b JB |
2312 | case BPSTAT_WHAT_LAST: |
2313 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2314 | |
488f131b JB |
2315 | case BPSTAT_WHAT_KEEP_CHECKING: |
2316 | break; | |
2317 | } | |
2318 | } | |
c906108c | 2319 | |
488f131b JB |
2320 | /* We come here if we hit a breakpoint but should not |
2321 | stop for it. Possibly we also were stepping | |
2322 | and should stop for that. So fall through and | |
2323 | test for stepping. But, if not stepping, | |
2324 | do not stop. */ | |
c906108c | 2325 | |
9d1ff73f MS |
2326 | /* Are we stepping to get the inferior out of the dynamic linker's |
2327 | hook (and possibly the dld itself) after catching a shlib | |
2328 | event? */ | |
488f131b JB |
2329 | if (ecs->stepping_through_solib_after_catch) |
2330 | { | |
2331 | #if defined(SOLIB_ADD) | |
2332 | /* Have we reached our destination? If not, keep going. */ | |
2333 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2334 | { | |
527159b7 | 2335 | if (debug_infrun) |
8a9de0e4 | 2336 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n"); |
488f131b JB |
2337 | ecs->another_trap = 1; |
2338 | keep_going (ecs); | |
104c1213 | 2339 | return; |
488f131b JB |
2340 | } |
2341 | #endif | |
527159b7 | 2342 | if (debug_infrun) |
8a9de0e4 | 2343 | fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n"); |
488f131b JB |
2344 | /* Else, stop and report the catchpoint(s) whose triggering |
2345 | caused us to begin stepping. */ | |
2346 | ecs->stepping_through_solib_after_catch = 0; | |
2347 | bpstat_clear (&stop_bpstat); | |
2348 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2349 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2350 | stop_print_frame = 1; | |
2351 | stop_stepping (ecs); | |
2352 | return; | |
2353 | } | |
c906108c | 2354 | |
488f131b JB |
2355 | if (step_resume_breakpoint) |
2356 | { | |
527159b7 | 2357 | if (debug_infrun) |
8a9de0e4 | 2358 | fprintf_unfiltered (gdb_stdlog, "infrun: step-resume breakpoint\n"); |
527159b7 | 2359 | |
488f131b JB |
2360 | /* Having a step-resume breakpoint overrides anything |
2361 | else having to do with stepping commands until | |
2362 | that breakpoint is reached. */ | |
488f131b JB |
2363 | keep_going (ecs); |
2364 | return; | |
2365 | } | |
c5aa993b | 2366 | |
488f131b JB |
2367 | if (step_range_end == 0) |
2368 | { | |
527159b7 | 2369 | if (debug_infrun) |
8a9de0e4 | 2370 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 2371 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
2372 | keep_going (ecs); |
2373 | return; | |
2374 | } | |
c5aa993b | 2375 | |
488f131b | 2376 | /* If stepping through a line, keep going if still within it. |
c906108c | 2377 | |
488f131b JB |
2378 | Note that step_range_end is the address of the first instruction |
2379 | beyond the step range, and NOT the address of the last instruction | |
2380 | within it! */ | |
2381 | if (stop_pc >= step_range_start && stop_pc < step_range_end) | |
2382 | { | |
527159b7 | 2383 | if (debug_infrun) |
8a9de0e4 | 2384 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping inside range [0x%s-0x%s]\n", |
527159b7 RC |
2385 | paddr_nz (step_range_start), |
2386 | paddr_nz (step_range_end)); | |
488f131b JB |
2387 | keep_going (ecs); |
2388 | return; | |
2389 | } | |
c5aa993b | 2390 | |
488f131b | 2391 | /* We stepped out of the stepping range. */ |
c906108c | 2392 | |
488f131b JB |
2393 | /* If we are stepping at the source level and entered the runtime |
2394 | loader dynamic symbol resolution code, we keep on single stepping | |
2395 | until we exit the run time loader code and reach the callee's | |
2396 | address. */ | |
2397 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
a77053c2 MK |
2398 | #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE |
2399 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc) | |
2400 | #else | |
2401 | && in_solib_dynsym_resolve_code (stop_pc) | |
2402 | #endif | |
2403 | ) | |
488f131b | 2404 | { |
4c8c40e6 MK |
2405 | CORE_ADDR pc_after_resolver = |
2406 | gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); | |
c906108c | 2407 | |
527159b7 | 2408 | if (debug_infrun) |
8a9de0e4 | 2409 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n"); |
527159b7 | 2410 | |
488f131b JB |
2411 | if (pc_after_resolver) |
2412 | { | |
2413 | /* Set up a step-resume breakpoint at the address | |
2414 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2415 | struct symtab_and_line sr_sal; | |
fe39c653 | 2416 | init_sal (&sr_sal); |
488f131b JB |
2417 | sr_sal.pc = pc_after_resolver; |
2418 | ||
44cbf7b5 | 2419 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c5aa993b | 2420 | } |
c906108c | 2421 | |
488f131b JB |
2422 | keep_going (ecs); |
2423 | return; | |
2424 | } | |
c906108c | 2425 | |
42edda50 AC |
2426 | if (step_range_end != 1 |
2427 | && (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2428 | || step_over_calls == STEP_OVER_ALL) | |
2429 | && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME) | |
488f131b | 2430 | { |
527159b7 | 2431 | if (debug_infrun) |
8a9de0e4 | 2432 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n"); |
42edda50 | 2433 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
2434 | a signal trampoline (either by a signal being delivered or by |
2435 | the signal handler returning). Just single-step until the | |
2436 | inferior leaves the trampoline (either by calling the handler | |
2437 | or returning). */ | |
488f131b JB |
2438 | keep_going (ecs); |
2439 | return; | |
2440 | } | |
c906108c | 2441 | |
c17eaafe DJ |
2442 | /* Check for subroutine calls. The check for the current frame |
2443 | equalling the step ID is not necessary - the check of the | |
2444 | previous frame's ID is sufficient - but it is a common case and | |
2445 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
2446 | |
2447 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
2448 | being equal, so to get into this block, both the current and | |
2449 | previous frame must have valid frame IDs. */ | |
c17eaafe DJ |
2450 | if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id) |
2451 | && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id)) | |
488f131b | 2452 | { |
95918acb | 2453 | CORE_ADDR real_stop_pc; |
8fb3e588 | 2454 | |
527159b7 | 2455 | if (debug_infrun) |
8a9de0e4 | 2456 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 2457 | |
95918acb AC |
2458 | if ((step_over_calls == STEP_OVER_NONE) |
2459 | || ((step_range_end == 1) | |
2460 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
2461 | { | |
2462 | /* I presume that step_over_calls is only 0 when we're | |
2463 | supposed to be stepping at the assembly language level | |
2464 | ("stepi"). Just stop. */ | |
2465 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
2466 | thought it was a subroutine call but it was not. Stop as | |
2467 | well. FENN */ | |
2468 | stop_step = 1; | |
2469 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2470 | stop_stepping (ecs); | |
2471 | return; | |
2472 | } | |
8fb3e588 | 2473 | |
8567c30f AC |
2474 | if (step_over_calls == STEP_OVER_ALL) |
2475 | { | |
2476 | /* We're doing a "next", set a breakpoint at callee's return | |
2477 | address (the address at which the caller will | |
2478 | resume). */ | |
14e60db5 | 2479 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
8567c30f AC |
2480 | keep_going (ecs); |
2481 | return; | |
2482 | } | |
a53c66de | 2483 | |
95918acb | 2484 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
2485 | calling routine and the real function), locate the real |
2486 | function. That's what tells us (a) whether we want to step | |
2487 | into it at all, and (b) what prologue we want to run to the | |
2488 | end of, if we do step into it. */ | |
95918acb AC |
2489 | real_stop_pc = skip_language_trampoline (stop_pc); |
2490 | if (real_stop_pc == 0) | |
2491 | real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2492 | if (real_stop_pc != 0) | |
2493 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 2494 | |
a77053c2 MK |
2495 | if ( |
2496 | #ifdef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
2497 | IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start) | |
2498 | #else | |
2499 | in_solib_dynsym_resolve_code (ecs->stop_func_start) | |
2500 | #endif | |
2501 | ) | |
1b2bfbb9 RC |
2502 | { |
2503 | struct symtab_and_line sr_sal; | |
2504 | init_sal (&sr_sal); | |
2505 | sr_sal.pc = ecs->stop_func_start; | |
2506 | ||
44cbf7b5 | 2507 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
8fb3e588 AC |
2508 | keep_going (ecs); |
2509 | return; | |
1b2bfbb9 RC |
2510 | } |
2511 | ||
95918acb | 2512 | /* If we have line number information for the function we are |
8fb3e588 | 2513 | thinking of stepping into, step into it. |
95918acb | 2514 | |
8fb3e588 AC |
2515 | If there are several symtabs at that PC (e.g. with include |
2516 | files), just want to know whether *any* of them have line | |
2517 | numbers. find_pc_line handles this. */ | |
95918acb AC |
2518 | { |
2519 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 2520 | |
95918acb AC |
2521 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2522 | if (tmp_sal.line != 0) | |
2523 | { | |
2524 | step_into_function (ecs); | |
2525 | return; | |
2526 | } | |
2527 | } | |
2528 | ||
2529 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
2530 | set, we stop the step so that the user has a chance to switch |
2531 | in assembly mode. */ | |
95918acb AC |
2532 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) |
2533 | { | |
2534 | stop_step = 1; | |
2535 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2536 | stop_stepping (ecs); | |
2537 | return; | |
2538 | } | |
2539 | ||
2540 | /* Set a breakpoint at callee's return address (the address at | |
8fb3e588 | 2541 | which the caller will resume). */ |
14e60db5 | 2542 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
95918acb | 2543 | keep_going (ecs); |
488f131b | 2544 | return; |
488f131b | 2545 | } |
c906108c | 2546 | |
488f131b JB |
2547 | /* If we're in the return path from a shared library trampoline, |
2548 | we want to proceed through the trampoline when stepping. */ | |
2549 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2550 | { | |
488f131b | 2551 | /* Determine where this trampoline returns. */ |
5cf4d23a | 2552 | CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); |
c906108c | 2553 | |
527159b7 | 2554 | if (debug_infrun) |
8a9de0e4 | 2555 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n"); |
527159b7 | 2556 | |
488f131b | 2557 | /* Only proceed through if we know where it's going. */ |
d764a824 | 2558 | if (real_stop_pc) |
488f131b JB |
2559 | { |
2560 | /* And put the step-breakpoint there and go until there. */ | |
2561 | struct symtab_and_line sr_sal; | |
2562 | ||
fe39c653 | 2563 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 2564 | sr_sal.pc = real_stop_pc; |
488f131b | 2565 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
44cbf7b5 AC |
2566 | |
2567 | /* Do not specify what the fp should be when we stop since | |
2568 | on some machines the prologue is where the new fp value | |
2569 | is established. */ | |
2570 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); | |
c906108c | 2571 | |
488f131b JB |
2572 | /* Restart without fiddling with the step ranges or |
2573 | other state. */ | |
2574 | keep_going (ecs); | |
2575 | return; | |
2576 | } | |
2577 | } | |
c906108c | 2578 | |
7ed0fe66 DJ |
2579 | ecs->sal = find_pc_line (stop_pc, 0); |
2580 | ||
1b2bfbb9 RC |
2581 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
2582 | the trampoline processing logic, however, there are some trampolines | |
2583 | that have no names, so we should do trampoline handling first. */ | |
2584 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
7ed0fe66 DJ |
2585 | && ecs->stop_func_name == NULL |
2586 | && ecs->sal.line == 0) | |
1b2bfbb9 | 2587 | { |
527159b7 | 2588 | if (debug_infrun) |
8a9de0e4 | 2589 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n"); |
527159b7 | 2590 | |
1b2bfbb9 | 2591 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
2592 | undebuggable function (where there is no debugging information |
2593 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
2594 | inferior stopped). Since we want to skip this kind of code, |
2595 | we keep going until the inferior returns from this | |
14e60db5 DJ |
2596 | function - unless the user has asked us not to (via |
2597 | set step-mode) or we no longer know how to get back | |
2598 | to the call site. */ | |
2599 | if (step_stop_if_no_debug | |
2600 | || !frame_id_p (frame_unwind_id (get_current_frame ()))) | |
1b2bfbb9 RC |
2601 | { |
2602 | /* If we have no line number and the step-stop-if-no-debug | |
2603 | is set, we stop the step so that the user has a chance to | |
2604 | switch in assembly mode. */ | |
2605 | stop_step = 1; | |
2606 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2607 | stop_stepping (ecs); | |
2608 | return; | |
2609 | } | |
2610 | else | |
2611 | { | |
2612 | /* Set a breakpoint at callee's return address (the address | |
2613 | at which the caller will resume). */ | |
14e60db5 | 2614 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
1b2bfbb9 RC |
2615 | keep_going (ecs); |
2616 | return; | |
2617 | } | |
2618 | } | |
2619 | ||
2620 | if (step_range_end == 1) | |
2621 | { | |
2622 | /* It is stepi or nexti. We always want to stop stepping after | |
2623 | one instruction. */ | |
527159b7 | 2624 | if (debug_infrun) |
8a9de0e4 | 2625 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
1b2bfbb9 RC |
2626 | stop_step = 1; |
2627 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2628 | stop_stepping (ecs); | |
2629 | return; | |
2630 | } | |
2631 | ||
488f131b JB |
2632 | if (ecs->sal.line == 0) |
2633 | { | |
2634 | /* We have no line number information. That means to stop | |
2635 | stepping (does this always happen right after one instruction, | |
2636 | when we do "s" in a function with no line numbers, | |
2637 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 2638 | if (debug_infrun) |
8a9de0e4 | 2639 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
488f131b JB |
2640 | stop_step = 1; |
2641 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2642 | stop_stepping (ecs); | |
2643 | return; | |
2644 | } | |
c906108c | 2645 | |
488f131b JB |
2646 | if ((stop_pc == ecs->sal.pc) |
2647 | && (ecs->current_line != ecs->sal.line | |
2648 | || ecs->current_symtab != ecs->sal.symtab)) | |
2649 | { | |
2650 | /* We are at the start of a different line. So stop. Note that | |
2651 | we don't stop if we step into the middle of a different line. | |
2652 | That is said to make things like for (;;) statements work | |
2653 | better. */ | |
527159b7 | 2654 | if (debug_infrun) |
8a9de0e4 | 2655 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n"); |
488f131b JB |
2656 | stop_step = 1; |
2657 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2658 | stop_stepping (ecs); | |
2659 | return; | |
2660 | } | |
c906108c | 2661 | |
488f131b | 2662 | /* We aren't done stepping. |
c906108c | 2663 | |
488f131b JB |
2664 | Optimize by setting the stepping range to the line. |
2665 | (We might not be in the original line, but if we entered a | |
2666 | new line in mid-statement, we continue stepping. This makes | |
2667 | things like for(;;) statements work better.) */ | |
c906108c | 2668 | |
488f131b | 2669 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
c5aa993b | 2670 | { |
488f131b JB |
2671 | /* If this is the last line of the function, don't keep stepping |
2672 | (it would probably step us out of the function). | |
2673 | This is particularly necessary for a one-line function, | |
2674 | in which after skipping the prologue we better stop even though | |
2675 | we will be in mid-line. */ | |
527159b7 | 2676 | if (debug_infrun) |
8a9de0e4 | 2677 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different function\n"); |
488f131b JB |
2678 | stop_step = 1; |
2679 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2680 | stop_stepping (ecs); | |
2681 | return; | |
c5aa993b | 2682 | } |
488f131b JB |
2683 | step_range_start = ecs->sal.pc; |
2684 | step_range_end = ecs->sal.end; | |
aa0cd9c1 | 2685 | step_frame_id = get_frame_id (get_current_frame ()); |
488f131b JB |
2686 | ecs->current_line = ecs->sal.line; |
2687 | ecs->current_symtab = ecs->sal.symtab; | |
2688 | ||
aa0cd9c1 AC |
2689 | /* In the case where we just stepped out of a function into the |
2690 | middle of a line of the caller, continue stepping, but | |
2691 | step_frame_id must be modified to current frame */ | |
65815ea1 AC |
2692 | #if 0 |
2693 | /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too | |
2694 | generous. It will trigger on things like a step into a frameless | |
2695 | stackless leaf function. I think the logic should instead look | |
2696 | at the unwound frame ID has that should give a more robust | |
2697 | indication of what happened. */ | |
8fb3e588 AC |
2698 | if (step - ID == current - ID) |
2699 | still stepping in same function; | |
2700 | else if (step - ID == unwind (current - ID)) | |
2701 | stepped into a function; | |
2702 | else | |
2703 | stepped out of a function; | |
2704 | /* Of course this assumes that the frame ID unwind code is robust | |
2705 | and we're willing to introduce frame unwind logic into this | |
2706 | function. Fortunately, those days are nearly upon us. */ | |
65815ea1 | 2707 | #endif |
488f131b | 2708 | { |
aa0cd9c1 AC |
2709 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
2710 | if (!(frame_id_inner (current_frame, step_frame_id))) | |
2711 | step_frame_id = current_frame; | |
488f131b | 2712 | } |
c906108c | 2713 | |
527159b7 | 2714 | if (debug_infrun) |
8a9de0e4 | 2715 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 2716 | keep_going (ecs); |
104c1213 JM |
2717 | } |
2718 | ||
2719 | /* Are we in the middle of stepping? */ | |
2720 | ||
2721 | static int | |
2722 | currently_stepping (struct execution_control_state *ecs) | |
2723 | { | |
d303a6c7 | 2724 | return ((!ecs->handling_longjmp |
104c1213 JM |
2725 | && ((step_range_end && step_resume_breakpoint == NULL) |
2726 | || trap_expected)) | |
2727 | || ecs->stepping_through_solib_after_catch | |
2728 | || bpstat_should_step ()); | |
2729 | } | |
c906108c | 2730 | |
c2c6d25f JM |
2731 | /* Subroutine call with source code we should not step over. Do step |
2732 | to the first line of code in it. */ | |
2733 | ||
2734 | static void | |
2735 | step_into_function (struct execution_control_state *ecs) | |
2736 | { | |
2737 | struct symtab *s; | |
2738 | struct symtab_and_line sr_sal; | |
2739 | ||
2740 | s = find_pc_symtab (stop_pc); | |
2741 | if (s && s->language != language_asm) | |
2742 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
2743 | ||
2744 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2745 | /* Use the step_resume_break to step until the end of the prologue, | |
2746 | even if that involves jumps (as it seems to on the vax under | |
2747 | 4.2). */ | |
2748 | /* If the prologue ends in the middle of a source line, continue to | |
2749 | the end of that source line (if it is still within the function). | |
2750 | Otherwise, just go to end of prologue. */ | |
c2c6d25f JM |
2751 | if (ecs->sal.end |
2752 | && ecs->sal.pc != ecs->stop_func_start | |
2753 | && ecs->sal.end < ecs->stop_func_end) | |
2754 | ecs->stop_func_start = ecs->sal.end; | |
c2c6d25f | 2755 | |
2dbd5e30 KB |
2756 | /* Architectures which require breakpoint adjustment might not be able |
2757 | to place a breakpoint at the computed address. If so, the test | |
2758 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
2759 | ecs->stop_func_start to an address at which a breakpoint may be | |
2760 | legitimately placed. | |
8fb3e588 | 2761 | |
2dbd5e30 KB |
2762 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
2763 | made, GDB will enter an infinite loop when stepping through | |
2764 | optimized code consisting of VLIW instructions which contain | |
2765 | subinstructions corresponding to different source lines. On | |
2766 | FR-V, it's not permitted to place a breakpoint on any but the | |
2767 | first subinstruction of a VLIW instruction. When a breakpoint is | |
2768 | set, GDB will adjust the breakpoint address to the beginning of | |
2769 | the VLIW instruction. Thus, we need to make the corresponding | |
2770 | adjustment here when computing the stop address. */ | |
8fb3e588 | 2771 | |
2dbd5e30 KB |
2772 | if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) |
2773 | { | |
2774 | ecs->stop_func_start | |
2775 | = gdbarch_adjust_breakpoint_address (current_gdbarch, | |
8fb3e588 | 2776 | ecs->stop_func_start); |
2dbd5e30 KB |
2777 | } |
2778 | ||
c2c6d25f JM |
2779 | if (ecs->stop_func_start == stop_pc) |
2780 | { | |
2781 | /* We are already there: stop now. */ | |
2782 | stop_step = 1; | |
488f131b | 2783 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2784 | stop_stepping (ecs); |
2785 | return; | |
2786 | } | |
2787 | else | |
2788 | { | |
2789 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 2790 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
2791 | sr_sal.pc = ecs->stop_func_start; |
2792 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
44cbf7b5 | 2793 | |
c2c6d25f | 2794 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
2795 | some machines the prologue is where the new fp value is |
2796 | established. */ | |
44cbf7b5 | 2797 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c2c6d25f JM |
2798 | |
2799 | /* And make sure stepping stops right away then. */ | |
2800 | step_range_end = step_range_start; | |
2801 | } | |
2802 | keep_going (ecs); | |
2803 | } | |
d4f3574e | 2804 | |
44cbf7b5 AC |
2805 | /* Insert a "step resume breakpoint" at SR_SAL with frame ID SR_ID. |
2806 | This is used to both functions and to skip over code. */ | |
2807 | ||
2808 | static void | |
2809 | insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, | |
2810 | struct frame_id sr_id) | |
2811 | { | |
2812 | /* There should never be more than one step-resume breakpoint per | |
2813 | thread, so we should never be setting a new | |
2814 | step_resume_breakpoint when one is already active. */ | |
2815 | gdb_assert (step_resume_breakpoint == NULL); | |
2816 | step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id, | |
2817 | bp_step_resume); | |
2818 | if (breakpoints_inserted) | |
2819 | insert_breakpoints (); | |
2820 | } | |
7ce450bd | 2821 | |
14e60db5 DJ |
2822 | /* Insert a "step resume breakpoint" at RETURN_FRAME.pc. This is used |
2823 | to skip a potential signal handler. | |
7ce450bd | 2824 | |
14e60db5 DJ |
2825 | This is called with the interrupted function's frame. The signal |
2826 | handler, when it returns, will resume the interrupted function at | |
2827 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
2828 | |
2829 | static void | |
44cbf7b5 | 2830 | insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
2831 | { |
2832 | struct symtab_and_line sr_sal; | |
2833 | ||
d303a6c7 AC |
2834 | init_sal (&sr_sal); /* initialize to zeros */ |
2835 | ||
7ce450bd | 2836 | sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (return_frame)); |
d303a6c7 AC |
2837 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2838 | ||
44cbf7b5 | 2839 | insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame)); |
d303a6c7 AC |
2840 | } |
2841 | ||
14e60db5 DJ |
2842 | /* Similar to insert_step_resume_breakpoint_at_frame, except |
2843 | but a breakpoint at the previous frame's PC. This is used to | |
2844 | skip a function after stepping into it (for "next" or if the called | |
2845 | function has no debugging information). | |
2846 | ||
2847 | The current function has almost always been reached by single | |
2848 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
2849 | current function, and the breakpoint will be set at the caller's | |
2850 | resume address. | |
2851 | ||
2852 | This is a separate function rather than reusing | |
2853 | insert_step_resume_breakpoint_at_frame in order to avoid | |
2854 | get_prev_frame, which may stop prematurely (see the implementation | |
2855 | of frame_unwind_id for an example). */ | |
2856 | ||
2857 | static void | |
2858 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
2859 | { | |
2860 | struct symtab_and_line sr_sal; | |
2861 | ||
2862 | /* We shouldn't have gotten here if we don't know where the call site | |
2863 | is. */ | |
2864 | gdb_assert (frame_id_p (frame_unwind_id (next_frame))); | |
2865 | ||
2866 | init_sal (&sr_sal); /* initialize to zeros */ | |
2867 | ||
2868 | sr_sal.pc = ADDR_BITS_REMOVE (frame_pc_unwind (next_frame)); | |
2869 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2870 | ||
2871 | insert_step_resume_breakpoint_at_sal (sr_sal, frame_unwind_id (next_frame)); | |
2872 | } | |
2873 | ||
104c1213 JM |
2874 | static void |
2875 | stop_stepping (struct execution_control_state *ecs) | |
2876 | { | |
527159b7 | 2877 | if (debug_infrun) |
8a9de0e4 | 2878 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
527159b7 | 2879 | |
cd0fc7c3 SS |
2880 | /* Let callers know we don't want to wait for the inferior anymore. */ |
2881 | ecs->wait_some_more = 0; | |
2882 | } | |
2883 | ||
d4f3574e SS |
2884 | /* This function handles various cases where we need to continue |
2885 | waiting for the inferior. */ | |
2886 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
2887 | ||
2888 | static void | |
2889 | keep_going (struct execution_control_state *ecs) | |
2890 | { | |
d4f3574e | 2891 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 2892 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e | 2893 | |
d4f3574e SS |
2894 | /* If we did not do break;, it means we should keep running the |
2895 | inferior and not return to debugger. */ | |
2896 | ||
2897 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
2898 | { | |
2899 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
2900 | the inferior, else we'd have done a break above) and we |
2901 | haven't yet gotten our trap. Simply continue. */ | |
d4f3574e SS |
2902 | resume (currently_stepping (ecs), stop_signal); |
2903 | } | |
2904 | else | |
2905 | { | |
2906 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
2907 | anyway (the user asked that this signal be passed to the |
2908 | child) | |
2909 | -- or -- | |
2910 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2911 | decided we should resume from it. | |
d4f3574e | 2912 | |
68f53502 | 2913 | We're going to run this baby now! */ |
d4f3574e | 2914 | |
68f53502 | 2915 | if (!breakpoints_inserted && !ecs->another_trap) |
d4f3574e SS |
2916 | { |
2917 | breakpoints_failed = insert_breakpoints (); | |
2918 | if (breakpoints_failed) | |
2919 | { | |
2920 | stop_stepping (ecs); | |
2921 | return; | |
2922 | } | |
2923 | breakpoints_inserted = 1; | |
2924 | } | |
2925 | ||
2926 | trap_expected = ecs->another_trap; | |
2927 | ||
2928 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
2929 | specifies that such a signal should be delivered to the |
2930 | target program). | |
2931 | ||
2932 | Typically, this would occure when a user is debugging a | |
2933 | target monitor on a simulator: the target monitor sets a | |
2934 | breakpoint; the simulator encounters this break-point and | |
2935 | halts the simulation handing control to GDB; GDB, noteing | |
2936 | that the break-point isn't valid, returns control back to the | |
2937 | simulator; the simulator then delivers the hardware | |
2938 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
2939 | ||
2940 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
2941 | stop_signal = TARGET_SIGNAL_0; |
2942 | ||
d4f3574e SS |
2943 | |
2944 | resume (currently_stepping (ecs), stop_signal); | |
2945 | } | |
2946 | ||
488f131b | 2947 | prepare_to_wait (ecs); |
d4f3574e SS |
2948 | } |
2949 | ||
104c1213 JM |
2950 | /* This function normally comes after a resume, before |
2951 | handle_inferior_event exits. It takes care of any last bits of | |
2952 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 2953 | |
104c1213 JM |
2954 | static void |
2955 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 2956 | { |
527159b7 | 2957 | if (debug_infrun) |
8a9de0e4 | 2958 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
104c1213 JM |
2959 | if (ecs->infwait_state == infwait_normal_state) |
2960 | { | |
2961 | overlay_cache_invalid = 1; | |
2962 | ||
2963 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
2964 | target_wait because they can be loaded from the target while |
2965 | in target_wait. This makes remote debugging a bit more | |
2966 | efficient for those targets that provide critical registers | |
2967 | as part of their normal status mechanism. */ | |
104c1213 JM |
2968 | |
2969 | registers_changed (); | |
39f77062 | 2970 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
2971 | ecs->wp = &(ecs->ws); |
2972 | } | |
2973 | /* This is the old end of the while loop. Let everybody know we | |
2974 | want to wait for the inferior some more and get called again | |
2975 | soon. */ | |
2976 | ecs->wait_some_more = 1; | |
c906108c | 2977 | } |
11cf8741 JM |
2978 | |
2979 | /* Print why the inferior has stopped. We always print something when | |
2980 | the inferior exits, or receives a signal. The rest of the cases are | |
2981 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
2982 | there should be a call to this function from handle_inferior_event() | |
2983 | each time stop_stepping() is called.*/ | |
2984 | static void | |
2985 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
2986 | { | |
2987 | switch (stop_reason) | |
2988 | { | |
2989 | case STOP_UNKNOWN: | |
2990 | /* We don't deal with these cases from handle_inferior_event() | |
2991 | yet. */ | |
2992 | break; | |
2993 | case END_STEPPING_RANGE: | |
2994 | /* We are done with a step/next/si/ni command. */ | |
2995 | /* For now print nothing. */ | |
fb40c209 | 2996 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 2997 | operation for n > 1 */ |
fb40c209 | 2998 | if (!step_multi || !stop_step) |
9dc5e2a9 | 2999 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3000 | ui_out_field_string |
3001 | (uiout, "reason", | |
3002 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
11cf8741 JM |
3003 | break; |
3004 | case BREAKPOINT_HIT: | |
3005 | /* We found a breakpoint. */ | |
3006 | /* For now print nothing. */ | |
3007 | break; | |
3008 | case SIGNAL_EXITED: | |
3009 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 3010 | annotate_signalled (); |
9dc5e2a9 | 3011 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3012 | ui_out_field_string |
3013 | (uiout, "reason", | |
3014 | async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8b93c638 JM |
3015 | ui_out_text (uiout, "\nProgram terminated with signal "); |
3016 | annotate_signal_name (); | |
488f131b JB |
3017 | ui_out_field_string (uiout, "signal-name", |
3018 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
3019 | annotate_signal_name_end (); |
3020 | ui_out_text (uiout, ", "); | |
3021 | annotate_signal_string (); | |
488f131b JB |
3022 | ui_out_field_string (uiout, "signal-meaning", |
3023 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
3024 | annotate_signal_string_end (); |
3025 | ui_out_text (uiout, ".\n"); | |
3026 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
3027 | break; |
3028 | case EXITED: | |
3029 | /* The inferior program is finished. */ | |
8b93c638 JM |
3030 | annotate_exited (stop_info); |
3031 | if (stop_info) | |
3032 | { | |
9dc5e2a9 | 3033 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3034 | ui_out_field_string (uiout, "reason", |
3035 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
8b93c638 | 3036 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
3037 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
3038 | (unsigned int) stop_info); | |
8b93c638 JM |
3039 | ui_out_text (uiout, ".\n"); |
3040 | } | |
3041 | else | |
3042 | { | |
9dc5e2a9 | 3043 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3044 | ui_out_field_string |
3045 | (uiout, "reason", | |
3046 | async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
8b93c638 JM |
3047 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
3048 | } | |
f17517ea AS |
3049 | /* Support the --return-child-result option. */ |
3050 | return_child_result_value = stop_info; | |
11cf8741 JM |
3051 | break; |
3052 | case SIGNAL_RECEIVED: | |
3053 | /* Signal received. The signal table tells us to print about | |
3054 | it. */ | |
8b93c638 JM |
3055 | annotate_signal (); |
3056 | ui_out_text (uiout, "\nProgram received signal "); | |
3057 | annotate_signal_name (); | |
84c6c83c | 3058 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3059 | ui_out_field_string |
3060 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b JB |
3061 | ui_out_field_string (uiout, "signal-name", |
3062 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
3063 | annotate_signal_name_end (); |
3064 | ui_out_text (uiout, ", "); | |
3065 | annotate_signal_string (); | |
488f131b JB |
3066 | ui_out_field_string (uiout, "signal-meaning", |
3067 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
3068 | annotate_signal_string_end (); |
3069 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
3070 | break; |
3071 | default: | |
8e65ff28 | 3072 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 3073 | _("print_stop_reason: unrecognized enum value")); |
11cf8741 JM |
3074 | break; |
3075 | } | |
3076 | } | |
c906108c | 3077 | \f |
43ff13b4 | 3078 | |
c906108c SS |
3079 | /* Here to return control to GDB when the inferior stops for real. |
3080 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
3081 | ||
3082 | STOP_PRINT_FRAME nonzero means print the executing frame | |
3083 | (pc, function, args, file, line number and line text). | |
3084 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
3085 | attempting to insert breakpoints. */ | |
3086 | ||
3087 | void | |
96baa820 | 3088 | normal_stop (void) |
c906108c | 3089 | { |
73b65bb0 DJ |
3090 | struct target_waitstatus last; |
3091 | ptid_t last_ptid; | |
3092 | ||
3093 | get_last_target_status (&last_ptid, &last); | |
3094 | ||
c906108c SS |
3095 | /* As with the notification of thread events, we want to delay |
3096 | notifying the user that we've switched thread context until | |
3097 | the inferior actually stops. | |
3098 | ||
73b65bb0 DJ |
3099 | There's no point in saying anything if the inferior has exited. |
3100 | Note that SIGNALLED here means "exited with a signal", not | |
3101 | "received a signal". */ | |
488f131b | 3102 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
73b65bb0 DJ |
3103 | && target_has_execution |
3104 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
3105 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
3106 | { |
3107 | target_terminal_ours_for_output (); | |
a3f17187 | 3108 | printf_filtered (_("[Switching to %s]\n"), |
39f77062 KB |
3109 | target_pid_or_tid_to_str (inferior_ptid)); |
3110 | previous_inferior_ptid = inferior_ptid; | |
c906108c | 3111 | } |
c906108c | 3112 | |
4fa8626c | 3113 | /* NOTE drow/2004-01-17: Is this still necessary? */ |
c906108c SS |
3114 | /* Make sure that the current_frame's pc is correct. This |
3115 | is a correction for setting up the frame info before doing | |
3116 | DECR_PC_AFTER_BREAK */ | |
b87efeee AC |
3117 | if (target_has_execution) |
3118 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to | |
3119 | DECR_PC_AFTER_BREAK, the program counter can change. Ask the | |
3120 | frame code to check for this and sort out any resultant mess. | |
3121 | DECR_PC_AFTER_BREAK needs to just go away. */ | |
2f107107 | 3122 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
c906108c | 3123 | |
c906108c SS |
3124 | if (target_has_execution && breakpoints_inserted) |
3125 | { | |
3126 | if (remove_breakpoints ()) | |
3127 | { | |
3128 | target_terminal_ours_for_output (); | |
a3f17187 AC |
3129 | printf_filtered (_("\ |
3130 | Cannot remove breakpoints because program is no longer writable.\n\ | |
3131 | It might be running in another process.\n\ | |
3132 | Further execution is probably impossible.\n")); | |
c906108c SS |
3133 | } |
3134 | } | |
3135 | breakpoints_inserted = 0; | |
3136 | ||
3137 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3138 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3139 | ||
3140 | breakpoint_auto_delete (stop_bpstat); | |
3141 | ||
3142 | /* If an auto-display called a function and that got a signal, | |
3143 | delete that auto-display to avoid an infinite recursion. */ | |
3144 | ||
3145 | if (stopped_by_random_signal) | |
3146 | disable_current_display (); | |
3147 | ||
3148 | /* Don't print a message if in the middle of doing a "step n" | |
3149 | operation for n > 1 */ | |
3150 | if (step_multi && stop_step) | |
3151 | goto done; | |
3152 | ||
3153 | target_terminal_ours (); | |
3154 | ||
7abfe014 DJ |
3155 | /* Set the current source location. This will also happen if we |
3156 | display the frame below, but the current SAL will be incorrect | |
3157 | during a user hook-stop function. */ | |
3158 | if (target_has_stack && !stop_stack_dummy) | |
3159 | set_current_sal_from_frame (get_current_frame (), 1); | |
3160 | ||
5913bcb0 AC |
3161 | /* Look up the hook_stop and run it (CLI internally handles problem |
3162 | of stop_command's pre-hook not existing). */ | |
3163 | if (stop_command) | |
3164 | catch_errors (hook_stop_stub, stop_command, | |
3165 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
3166 | |
3167 | if (!target_has_stack) | |
3168 | { | |
3169 | ||
3170 | goto done; | |
3171 | } | |
3172 | ||
3173 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3174 | and current location is based on that. | |
3175 | Don't do this on return from a stack dummy routine, | |
3176 | or if the program has exited. */ | |
3177 | ||
3178 | if (!stop_stack_dummy) | |
3179 | { | |
0f7d239c | 3180 | select_frame (get_current_frame ()); |
c906108c SS |
3181 | |
3182 | /* Print current location without a level number, if | |
c5aa993b JM |
3183 | we have changed functions or hit a breakpoint. |
3184 | Print source line if we have one. | |
3185 | bpstat_print() contains the logic deciding in detail | |
3186 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3187 | |
6e7f8b9c | 3188 | if (stop_print_frame && deprecated_selected_frame) |
c906108c SS |
3189 | { |
3190 | int bpstat_ret; | |
3191 | int source_flag; | |
917317f4 | 3192 | int do_frame_printing = 1; |
c906108c SS |
3193 | |
3194 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3195 | switch (bpstat_ret) |
3196 | { | |
3197 | case PRINT_UNKNOWN: | |
aa0cd9c1 | 3198 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
3199 | (or should) carry around the function and does (or |
3200 | should) use that when doing a frame comparison. */ | |
917317f4 | 3201 | if (stop_step |
aa0cd9c1 AC |
3202 | && frame_id_eq (step_frame_id, |
3203 | get_frame_id (get_current_frame ())) | |
917317f4 | 3204 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3205 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3206 | else |
488f131b | 3207 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3208 | break; |
3209 | case PRINT_SRC_AND_LOC: | |
488f131b | 3210 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3211 | break; |
3212 | case PRINT_SRC_ONLY: | |
c5394b80 | 3213 | source_flag = SRC_LINE; |
917317f4 JM |
3214 | break; |
3215 | case PRINT_NOTHING: | |
488f131b | 3216 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3217 | do_frame_printing = 0; |
3218 | break; | |
3219 | default: | |
e2e0b3e5 | 3220 | internal_error (__FILE__, __LINE__, _("Unknown value.")); |
917317f4 | 3221 | } |
fb40c209 | 3222 | /* For mi, have the same behavior every time we stop: |
488f131b | 3223 | print everything but the source line. */ |
9dc5e2a9 | 3224 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3225 | source_flag = LOC_AND_ADDRESS; |
c906108c | 3226 | |
9dc5e2a9 | 3227 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 | 3228 | ui_out_field_int (uiout, "thread-id", |
488f131b | 3229 | pid_to_thread_id (inferior_ptid)); |
c906108c SS |
3230 | /* The behavior of this routine with respect to the source |
3231 | flag is: | |
c5394b80 JM |
3232 | SRC_LINE: Print only source line |
3233 | LOCATION: Print only location | |
3234 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3235 | if (do_frame_printing) |
b04f3ab4 | 3236 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
3237 | |
3238 | /* Display the auto-display expressions. */ | |
3239 | do_displays (); | |
3240 | } | |
3241 | } | |
3242 | ||
3243 | /* Save the function value return registers, if we care. | |
3244 | We might be about to restore their previous contents. */ | |
3245 | if (proceed_to_finish) | |
72cec141 AC |
3246 | /* NB: The copy goes through to the target picking up the value of |
3247 | all the registers. */ | |
3248 | regcache_cpy (stop_registers, current_regcache); | |
c906108c SS |
3249 | |
3250 | if (stop_stack_dummy) | |
3251 | { | |
dbe9fe58 AC |
3252 | /* Pop the empty frame that contains the stack dummy. POP_FRAME |
3253 | ends with a setting of the current frame, so we can use that | |
3254 | next. */ | |
3255 | frame_pop (get_current_frame ()); | |
c906108c | 3256 | /* Set stop_pc to what it was before we called the function. |
c5aa993b JM |
3257 | Can't rely on restore_inferior_status because that only gets |
3258 | called if we don't stop in the called function. */ | |
c906108c | 3259 | stop_pc = read_pc (); |
0f7d239c | 3260 | select_frame (get_current_frame ()); |
c906108c SS |
3261 | } |
3262 | ||
c906108c SS |
3263 | done: |
3264 | annotate_stopped (); | |
7a464420 | 3265 | observer_notify_normal_stop (stop_bpstat); |
c906108c SS |
3266 | } |
3267 | ||
3268 | static int | |
96baa820 | 3269 | hook_stop_stub (void *cmd) |
c906108c | 3270 | { |
5913bcb0 | 3271 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3272 | return (0); |
3273 | } | |
3274 | \f | |
c5aa993b | 3275 | int |
96baa820 | 3276 | signal_stop_state (int signo) |
c906108c SS |
3277 | { |
3278 | return signal_stop[signo]; | |
3279 | } | |
3280 | ||
c5aa993b | 3281 | int |
96baa820 | 3282 | signal_print_state (int signo) |
c906108c SS |
3283 | { |
3284 | return signal_print[signo]; | |
3285 | } | |
3286 | ||
c5aa993b | 3287 | int |
96baa820 | 3288 | signal_pass_state (int signo) |
c906108c SS |
3289 | { |
3290 | return signal_program[signo]; | |
3291 | } | |
3292 | ||
488f131b | 3293 | int |
7bda5e4a | 3294 | signal_stop_update (int signo, int state) |
d4f3574e SS |
3295 | { |
3296 | int ret = signal_stop[signo]; | |
3297 | signal_stop[signo] = state; | |
3298 | return ret; | |
3299 | } | |
3300 | ||
488f131b | 3301 | int |
7bda5e4a | 3302 | signal_print_update (int signo, int state) |
d4f3574e SS |
3303 | { |
3304 | int ret = signal_print[signo]; | |
3305 | signal_print[signo] = state; | |
3306 | return ret; | |
3307 | } | |
3308 | ||
488f131b | 3309 | int |
7bda5e4a | 3310 | signal_pass_update (int signo, int state) |
d4f3574e SS |
3311 | { |
3312 | int ret = signal_program[signo]; | |
3313 | signal_program[signo] = state; | |
3314 | return ret; | |
3315 | } | |
3316 | ||
c906108c | 3317 | static void |
96baa820 | 3318 | sig_print_header (void) |
c906108c | 3319 | { |
a3f17187 AC |
3320 | printf_filtered (_("\ |
3321 | Signal Stop\tPrint\tPass to program\tDescription\n")); | |
c906108c SS |
3322 | } |
3323 | ||
3324 | static void | |
96baa820 | 3325 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3326 | { |
3327 | char *name = target_signal_to_name (oursig); | |
3328 | int name_padding = 13 - strlen (name); | |
96baa820 | 3329 | |
c906108c SS |
3330 | if (name_padding <= 0) |
3331 | name_padding = 0; | |
3332 | ||
3333 | printf_filtered ("%s", name); | |
488f131b | 3334 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
3335 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3336 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3337 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3338 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3339 | } | |
3340 | ||
3341 | /* Specify how various signals in the inferior should be handled. */ | |
3342 | ||
3343 | static void | |
96baa820 | 3344 | handle_command (char *args, int from_tty) |
c906108c SS |
3345 | { |
3346 | char **argv; | |
3347 | int digits, wordlen; | |
3348 | int sigfirst, signum, siglast; | |
3349 | enum target_signal oursig; | |
3350 | int allsigs; | |
3351 | int nsigs; | |
3352 | unsigned char *sigs; | |
3353 | struct cleanup *old_chain; | |
3354 | ||
3355 | if (args == NULL) | |
3356 | { | |
e2e0b3e5 | 3357 | error_no_arg (_("signal to handle")); |
c906108c SS |
3358 | } |
3359 | ||
3360 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3361 | ||
3362 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3363 | sigs = (unsigned char *) alloca (nsigs); | |
3364 | memset (sigs, 0, nsigs); | |
3365 | ||
3366 | /* Break the command line up into args. */ | |
3367 | ||
3368 | argv = buildargv (args); | |
3369 | if (argv == NULL) | |
3370 | { | |
3371 | nomem (0); | |
3372 | } | |
7a292a7a | 3373 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3374 | |
3375 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3376 | actions. Signal numbers and signal names may be interspersed with | |
3377 | actions, with the actions being performed for all signals cumulatively | |
3378 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3379 | ||
3380 | while (*argv != NULL) | |
3381 | { | |
3382 | wordlen = strlen (*argv); | |
3383 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3384 | {; | |
3385 | } | |
3386 | allsigs = 0; | |
3387 | sigfirst = siglast = -1; | |
3388 | ||
3389 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3390 | { | |
3391 | /* Apply action to all signals except those used by the | |
3392 | debugger. Silently skip those. */ | |
3393 | allsigs = 1; | |
3394 | sigfirst = 0; | |
3395 | siglast = nsigs - 1; | |
3396 | } | |
3397 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3398 | { | |
3399 | SET_SIGS (nsigs, sigs, signal_stop); | |
3400 | SET_SIGS (nsigs, sigs, signal_print); | |
3401 | } | |
3402 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3403 | { | |
3404 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3405 | } | |
3406 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3407 | { | |
3408 | SET_SIGS (nsigs, sigs, signal_print); | |
3409 | } | |
3410 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3411 | { | |
3412 | SET_SIGS (nsigs, sigs, signal_program); | |
3413 | } | |
3414 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3415 | { | |
3416 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3417 | } | |
3418 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3419 | { | |
3420 | SET_SIGS (nsigs, sigs, signal_program); | |
3421 | } | |
3422 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3423 | { | |
3424 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3425 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3426 | } | |
3427 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3428 | { | |
3429 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3430 | } | |
3431 | else if (digits > 0) | |
3432 | { | |
3433 | /* It is numeric. The numeric signal refers to our own | |
3434 | internal signal numbering from target.h, not to host/target | |
3435 | signal number. This is a feature; users really should be | |
3436 | using symbolic names anyway, and the common ones like | |
3437 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3438 | ||
3439 | sigfirst = siglast = (int) | |
3440 | target_signal_from_command (atoi (*argv)); | |
3441 | if ((*argv)[digits] == '-') | |
3442 | { | |
3443 | siglast = (int) | |
3444 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3445 | } | |
3446 | if (sigfirst > siglast) | |
3447 | { | |
3448 | /* Bet he didn't figure we'd think of this case... */ | |
3449 | signum = sigfirst; | |
3450 | sigfirst = siglast; | |
3451 | siglast = signum; | |
3452 | } | |
3453 | } | |
3454 | else | |
3455 | { | |
3456 | oursig = target_signal_from_name (*argv); | |
3457 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3458 | { | |
3459 | sigfirst = siglast = (int) oursig; | |
3460 | } | |
3461 | else | |
3462 | { | |
3463 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 3464 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
3465 | } |
3466 | } | |
3467 | ||
3468 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3469 | which signals to apply actions to. */ |
c906108c SS |
3470 | |
3471 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3472 | { | |
3473 | switch ((enum target_signal) signum) | |
3474 | { | |
3475 | case TARGET_SIGNAL_TRAP: | |
3476 | case TARGET_SIGNAL_INT: | |
3477 | if (!allsigs && !sigs[signum]) | |
3478 | { | |
3479 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 3480 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
3481 | { |
3482 | sigs[signum] = 1; | |
3483 | } | |
3484 | else | |
3485 | { | |
a3f17187 | 3486 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
3487 | gdb_flush (gdb_stdout); |
3488 | } | |
3489 | } | |
3490 | break; | |
3491 | case TARGET_SIGNAL_0: | |
3492 | case TARGET_SIGNAL_DEFAULT: | |
3493 | case TARGET_SIGNAL_UNKNOWN: | |
3494 | /* Make sure that "all" doesn't print these. */ | |
3495 | break; | |
3496 | default: | |
3497 | sigs[signum] = 1; | |
3498 | break; | |
3499 | } | |
3500 | } | |
3501 | ||
3502 | argv++; | |
3503 | } | |
3504 | ||
39f77062 | 3505 | target_notice_signals (inferior_ptid); |
c906108c SS |
3506 | |
3507 | if (from_tty) | |
3508 | { | |
3509 | /* Show the results. */ | |
3510 | sig_print_header (); | |
3511 | for (signum = 0; signum < nsigs; signum++) | |
3512 | { | |
3513 | if (sigs[signum]) | |
3514 | { | |
3515 | sig_print_info (signum); | |
3516 | } | |
3517 | } | |
3518 | } | |
3519 | ||
3520 | do_cleanups (old_chain); | |
3521 | } | |
3522 | ||
3523 | static void | |
96baa820 | 3524 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3525 | { |
3526 | char **argv; | |
3527 | struct cleanup *old_chain; | |
3528 | ||
3529 | /* Break the command line up into args. */ | |
3530 | ||
3531 | argv = buildargv (args); | |
3532 | if (argv == NULL) | |
3533 | { | |
3534 | nomem (0); | |
3535 | } | |
7a292a7a | 3536 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3537 | if (argv[1] != (char *) NULL) |
3538 | { | |
3539 | char *argBuf; | |
3540 | int bufLen; | |
3541 | ||
3542 | bufLen = strlen (argv[0]) + 20; | |
3543 | argBuf = (char *) xmalloc (bufLen); | |
3544 | if (argBuf) | |
3545 | { | |
3546 | int validFlag = 1; | |
3547 | enum target_signal oursig; | |
3548 | ||
3549 | oursig = target_signal_from_name (argv[0]); | |
3550 | memset (argBuf, 0, bufLen); | |
3551 | if (strcmp (argv[1], "Q") == 0) | |
3552 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3553 | else | |
3554 | { | |
3555 | if (strcmp (argv[1], "s") == 0) | |
3556 | { | |
3557 | if (!signal_stop[oursig]) | |
3558 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3559 | else | |
3560 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3561 | } | |
3562 | else if (strcmp (argv[1], "i") == 0) | |
3563 | { | |
3564 | if (!signal_program[oursig]) | |
3565 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3566 | else | |
3567 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3568 | } | |
3569 | else if (strcmp (argv[1], "r") == 0) | |
3570 | { | |
3571 | if (!signal_print[oursig]) | |
3572 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3573 | else | |
3574 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3575 | } | |
3576 | else | |
3577 | validFlag = 0; | |
3578 | } | |
3579 | if (validFlag) | |
3580 | handle_command (argBuf, from_tty); | |
3581 | else | |
a3f17187 | 3582 | printf_filtered (_("Invalid signal handling flag.\n")); |
c906108c | 3583 | if (argBuf) |
b8c9b27d | 3584 | xfree (argBuf); |
c906108c SS |
3585 | } |
3586 | } | |
3587 | do_cleanups (old_chain); | |
3588 | } | |
3589 | ||
3590 | /* Print current contents of the tables set by the handle command. | |
3591 | It is possible we should just be printing signals actually used | |
3592 | by the current target (but for things to work right when switching | |
3593 | targets, all signals should be in the signal tables). */ | |
3594 | ||
3595 | static void | |
96baa820 | 3596 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3597 | { |
3598 | enum target_signal oursig; | |
3599 | sig_print_header (); | |
3600 | ||
3601 | if (signum_exp) | |
3602 | { | |
3603 | /* First see if this is a symbol name. */ | |
3604 | oursig = target_signal_from_name (signum_exp); | |
3605 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3606 | { | |
3607 | /* No, try numeric. */ | |
3608 | oursig = | |
bb518678 | 3609 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3610 | } |
3611 | sig_print_info (oursig); | |
3612 | return; | |
3613 | } | |
3614 | ||
3615 | printf_filtered ("\n"); | |
3616 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3617 | for (oursig = TARGET_SIGNAL_FIRST; | |
3618 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3619 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3620 | { | |
3621 | QUIT; | |
3622 | ||
3623 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 3624 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
3625 | sig_print_info (oursig); |
3626 | } | |
3627 | ||
a3f17187 | 3628 | printf_filtered (_("\nUse the \"handle\" command to change these tables.\n")); |
c906108c SS |
3629 | } |
3630 | \f | |
7a292a7a SS |
3631 | struct inferior_status |
3632 | { | |
3633 | enum target_signal stop_signal; | |
3634 | CORE_ADDR stop_pc; | |
3635 | bpstat stop_bpstat; | |
3636 | int stop_step; | |
3637 | int stop_stack_dummy; | |
3638 | int stopped_by_random_signal; | |
3639 | int trap_expected; | |
3640 | CORE_ADDR step_range_start; | |
3641 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 3642 | struct frame_id step_frame_id; |
5fbbeb29 | 3643 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3644 | CORE_ADDR step_resume_break_address; |
3645 | int stop_after_trap; | |
c0236d92 | 3646 | int stop_soon; |
72cec141 | 3647 | struct regcache *stop_registers; |
7a292a7a SS |
3648 | |
3649 | /* These are here because if call_function_by_hand has written some | |
3650 | registers and then decides to call error(), we better not have changed | |
3651 | any registers. */ | |
72cec141 | 3652 | struct regcache *registers; |
7a292a7a | 3653 | |
101dcfbe AC |
3654 | /* A frame unique identifier. */ |
3655 | struct frame_id selected_frame_id; | |
3656 | ||
7a292a7a SS |
3657 | int breakpoint_proceeded; |
3658 | int restore_stack_info; | |
3659 | int proceed_to_finish; | |
3660 | }; | |
3661 | ||
7a292a7a | 3662 | void |
96baa820 JM |
3663 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3664 | LONGEST val) | |
7a292a7a | 3665 | { |
3acba339 | 3666 | int size = register_size (current_gdbarch, regno); |
7a292a7a SS |
3667 | void *buf = alloca (size); |
3668 | store_signed_integer (buf, size, val); | |
0818c12a | 3669 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
3670 | } |
3671 | ||
c906108c SS |
3672 | /* Save all of the information associated with the inferior<==>gdb |
3673 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3674 | (defined in inferior.h). */ | |
3675 | ||
7a292a7a | 3676 | struct inferior_status * |
96baa820 | 3677 | save_inferior_status (int restore_stack_info) |
c906108c | 3678 | { |
72cec141 | 3679 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 3680 | |
c906108c SS |
3681 | inf_status->stop_signal = stop_signal; |
3682 | inf_status->stop_pc = stop_pc; | |
3683 | inf_status->stop_step = stop_step; | |
3684 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3685 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3686 | inf_status->trap_expected = trap_expected; | |
3687 | inf_status->step_range_start = step_range_start; | |
3688 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 3689 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
3690 | inf_status->step_over_calls = step_over_calls; |
3691 | inf_status->stop_after_trap = stop_after_trap; | |
c0236d92 | 3692 | inf_status->stop_soon = stop_soon; |
c906108c SS |
3693 | /* Save original bpstat chain here; replace it with copy of chain. |
3694 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3695 | hand them back the original chain when restore_inferior_status is |
3696 | called. */ | |
c906108c SS |
3697 | inf_status->stop_bpstat = stop_bpstat; |
3698 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3699 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3700 | inf_status->restore_stack_info = restore_stack_info; | |
3701 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3702 | |
72cec141 | 3703 | inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers); |
c906108c | 3704 | |
72cec141 | 3705 | inf_status->registers = regcache_dup (current_regcache); |
c906108c | 3706 | |
7a424e99 | 3707 | inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame); |
7a292a7a | 3708 | return inf_status; |
c906108c SS |
3709 | } |
3710 | ||
c906108c | 3711 | static int |
96baa820 | 3712 | restore_selected_frame (void *args) |
c906108c | 3713 | { |
488f131b | 3714 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 3715 | struct frame_info *frame; |
c906108c | 3716 | |
101dcfbe | 3717 | frame = frame_find_by_id (*fid); |
c906108c | 3718 | |
aa0cd9c1 AC |
3719 | /* If inf_status->selected_frame_id is NULL, there was no previously |
3720 | selected frame. */ | |
101dcfbe | 3721 | if (frame == NULL) |
c906108c | 3722 | { |
8a3fe4f8 | 3723 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
3724 | return 0; |
3725 | } | |
3726 | ||
0f7d239c | 3727 | select_frame (frame); |
c906108c SS |
3728 | |
3729 | return (1); | |
3730 | } | |
3731 | ||
3732 | void | |
96baa820 | 3733 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3734 | { |
3735 | stop_signal = inf_status->stop_signal; | |
3736 | stop_pc = inf_status->stop_pc; | |
3737 | stop_step = inf_status->stop_step; | |
3738 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3739 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3740 | trap_expected = inf_status->trap_expected; | |
3741 | step_range_start = inf_status->step_range_start; | |
3742 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 3743 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
3744 | step_over_calls = inf_status->step_over_calls; |
3745 | stop_after_trap = inf_status->stop_after_trap; | |
c0236d92 | 3746 | stop_soon = inf_status->stop_soon; |
c906108c SS |
3747 | bpstat_clear (&stop_bpstat); |
3748 | stop_bpstat = inf_status->stop_bpstat; | |
3749 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3750 | proceed_to_finish = inf_status->proceed_to_finish; | |
3751 | ||
72cec141 AC |
3752 | /* FIXME: Is the restore of stop_registers always needed. */ |
3753 | regcache_xfree (stop_registers); | |
3754 | stop_registers = inf_status->stop_registers; | |
c906108c SS |
3755 | |
3756 | /* The inferior can be gone if the user types "print exit(0)" | |
3757 | (and perhaps other times). */ | |
3758 | if (target_has_execution) | |
72cec141 AC |
3759 | /* NB: The register write goes through to the target. */ |
3760 | regcache_cpy (current_regcache, inf_status->registers); | |
3761 | regcache_xfree (inf_status->registers); | |
c906108c | 3762 | |
c906108c SS |
3763 | /* FIXME: If we are being called after stopping in a function which |
3764 | is called from gdb, we should not be trying to restore the | |
3765 | selected frame; it just prints a spurious error message (The | |
3766 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3767 | clobbers the stack)). In fact, should we be restoring the | |
3768 | inferior status at all in that case? . */ | |
3769 | ||
3770 | if (target_has_stack && inf_status->restore_stack_info) | |
3771 | { | |
c906108c | 3772 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
3773 | walking the stack might encounter a garbage pointer and |
3774 | error() trying to dereference it. */ | |
488f131b JB |
3775 | if (catch_errors |
3776 | (restore_selected_frame, &inf_status->selected_frame_id, | |
3777 | "Unable to restore previously selected frame:\n", | |
3778 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
3779 | /* Error in restoring the selected frame. Select the innermost |
3780 | frame. */ | |
0f7d239c | 3781 | select_frame (get_current_frame ()); |
c906108c SS |
3782 | |
3783 | } | |
c906108c | 3784 | |
72cec141 | 3785 | xfree (inf_status); |
7a292a7a | 3786 | } |
c906108c | 3787 | |
74b7792f AC |
3788 | static void |
3789 | do_restore_inferior_status_cleanup (void *sts) | |
3790 | { | |
3791 | restore_inferior_status (sts); | |
3792 | } | |
3793 | ||
3794 | struct cleanup * | |
3795 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
3796 | { | |
3797 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
3798 | } | |
3799 | ||
c906108c | 3800 | void |
96baa820 | 3801 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3802 | { |
3803 | /* See save_inferior_status for info on stop_bpstat. */ | |
3804 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 AC |
3805 | regcache_xfree (inf_status->registers); |
3806 | regcache_xfree (inf_status->stop_registers); | |
3807 | xfree (inf_status); | |
7a292a7a SS |
3808 | } |
3809 | ||
47932f85 DJ |
3810 | int |
3811 | inferior_has_forked (int pid, int *child_pid) | |
3812 | { | |
3813 | struct target_waitstatus last; | |
3814 | ptid_t last_ptid; | |
3815 | ||
3816 | get_last_target_status (&last_ptid, &last); | |
3817 | ||
3818 | if (last.kind != TARGET_WAITKIND_FORKED) | |
3819 | return 0; | |
3820 | ||
3821 | if (ptid_get_pid (last_ptid) != pid) | |
3822 | return 0; | |
3823 | ||
3824 | *child_pid = last.value.related_pid; | |
3825 | return 1; | |
3826 | } | |
3827 | ||
3828 | int | |
3829 | inferior_has_vforked (int pid, int *child_pid) | |
3830 | { | |
3831 | struct target_waitstatus last; | |
3832 | ptid_t last_ptid; | |
3833 | ||
3834 | get_last_target_status (&last_ptid, &last); | |
3835 | ||
3836 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
3837 | return 0; | |
3838 | ||
3839 | if (ptid_get_pid (last_ptid) != pid) | |
3840 | return 0; | |
3841 | ||
3842 | *child_pid = last.value.related_pid; | |
3843 | return 1; | |
3844 | } | |
3845 | ||
3846 | int | |
3847 | inferior_has_execd (int pid, char **execd_pathname) | |
3848 | { | |
3849 | struct target_waitstatus last; | |
3850 | ptid_t last_ptid; | |
3851 | ||
3852 | get_last_target_status (&last_ptid, &last); | |
3853 | ||
3854 | if (last.kind != TARGET_WAITKIND_EXECD) | |
3855 | return 0; | |
3856 | ||
3857 | if (ptid_get_pid (last_ptid) != pid) | |
3858 | return 0; | |
3859 | ||
3860 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
3861 | return 1; | |
3862 | } | |
3863 | ||
ca6724c1 KB |
3864 | /* Oft used ptids */ |
3865 | ptid_t null_ptid; | |
3866 | ptid_t minus_one_ptid; | |
3867 | ||
3868 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 3869 | |
ca6724c1 KB |
3870 | ptid_t |
3871 | ptid_build (int pid, long lwp, long tid) | |
3872 | { | |
3873 | ptid_t ptid; | |
3874 | ||
3875 | ptid.pid = pid; | |
3876 | ptid.lwp = lwp; | |
3877 | ptid.tid = tid; | |
3878 | return ptid; | |
3879 | } | |
3880 | ||
3881 | /* Create a ptid from just a pid. */ | |
3882 | ||
3883 | ptid_t | |
3884 | pid_to_ptid (int pid) | |
3885 | { | |
3886 | return ptid_build (pid, 0, 0); | |
3887 | } | |
3888 | ||
3889 | /* Fetch the pid (process id) component from a ptid. */ | |
3890 | ||
3891 | int | |
3892 | ptid_get_pid (ptid_t ptid) | |
3893 | { | |
3894 | return ptid.pid; | |
3895 | } | |
3896 | ||
3897 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
3898 | ||
3899 | long | |
3900 | ptid_get_lwp (ptid_t ptid) | |
3901 | { | |
3902 | return ptid.lwp; | |
3903 | } | |
3904 | ||
3905 | /* Fetch the tid (thread id) component from a ptid. */ | |
3906 | ||
3907 | long | |
3908 | ptid_get_tid (ptid_t ptid) | |
3909 | { | |
3910 | return ptid.tid; | |
3911 | } | |
3912 | ||
3913 | /* ptid_equal() is used to test equality of two ptids. */ | |
3914 | ||
3915 | int | |
3916 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
3917 | { | |
3918 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 3919 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
3920 | } |
3921 | ||
3922 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
3923 | to restore the inferior_ptid value saved in a call to | |
3924 | save_inferior_ptid(). */ | |
ce696e05 KB |
3925 | |
3926 | static void | |
3927 | restore_inferior_ptid (void *arg) | |
3928 | { | |
3929 | ptid_t *saved_ptid_ptr = arg; | |
3930 | inferior_ptid = *saved_ptid_ptr; | |
3931 | xfree (arg); | |
3932 | } | |
3933 | ||
3934 | /* Save the value of inferior_ptid so that it may be restored by a | |
3935 | later call to do_cleanups(). Returns the struct cleanup pointer | |
3936 | needed for later doing the cleanup. */ | |
3937 | ||
3938 | struct cleanup * | |
3939 | save_inferior_ptid (void) | |
3940 | { | |
3941 | ptid_t *saved_ptid_ptr; | |
3942 | ||
3943 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
3944 | *saved_ptid_ptr = inferior_ptid; | |
3945 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
3946 | } | |
c5aa993b | 3947 | \f |
488f131b | 3948 | |
7a292a7a | 3949 | static void |
96baa820 | 3950 | build_infrun (void) |
7a292a7a | 3951 | { |
72cec141 | 3952 | stop_registers = regcache_xmalloc (current_gdbarch); |
7a292a7a | 3953 | } |
c906108c | 3954 | |
c906108c | 3955 | void |
96baa820 | 3956 | _initialize_infrun (void) |
c906108c | 3957 | { |
52f0bd74 AC |
3958 | int i; |
3959 | int numsigs; | |
c906108c SS |
3960 | struct cmd_list_element *c; |
3961 | ||
046a4708 AC |
3962 | DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers); |
3963 | deprecated_register_gdbarch_swap (NULL, 0, build_infrun); | |
0f71a2f6 | 3964 | |
1bedd215 AC |
3965 | add_info ("signals", signals_info, _("\ |
3966 | What debugger does when program gets various signals.\n\ | |
3967 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
3968 | add_info_alias ("handle", "signals", 0); |
3969 | ||
1bedd215 AC |
3970 | add_com ("handle", class_run, handle_command, _("\ |
3971 | Specify how to handle a signal.\n\ | |
c906108c SS |
3972 | Args are signals and actions to apply to those signals.\n\ |
3973 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3974 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3975 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3976 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
3977 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
3978 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
c906108c SS |
3979 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
3980 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3981 | Print means print a message if this signal happens.\n\ | |
3982 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3983 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 3984 | Pass and Stop may be combined.")); |
c906108c SS |
3985 | if (xdb_commands) |
3986 | { | |
1bedd215 AC |
3987 | add_com ("lz", class_info, signals_info, _("\ |
3988 | What debugger does when program gets various signals.\n\ | |
3989 | Specify a signal as argument to print info on that signal only.")); | |
3990 | add_com ("z", class_run, xdb_handle_command, _("\ | |
3991 | Specify how to handle a signal.\n\ | |
c906108c SS |
3992 | Args are signals and actions to apply to those signals.\n\ |
3993 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3994 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3995 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3996 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
3997 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
3998 | Recognized actions include \"s\" (toggles between stop and nostop), \n\ | |
c906108c SS |
3999 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
4000 | nopass), \"Q\" (noprint)\n\ | |
4001 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
4002 | Print means print a message if this signal happens.\n\ | |
4003 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
4004 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 4005 | Pass and Stop may be combined.")); |
c906108c SS |
4006 | } |
4007 | ||
4008 | if (!dbx_commands) | |
1a966eab AC |
4009 | stop_command = add_cmd ("stop", class_obscure, |
4010 | not_just_help_class_command, _("\ | |
4011 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 4012 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 4013 | of the program stops."), &cmdlist); |
c906108c | 4014 | |
85c07804 AC |
4015 | add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
4016 | Set inferior debugging."), _("\ | |
4017 | Show inferior debugging."), _("\ | |
4018 | When non-zero, inferior specific debugging is enabled."), | |
4019 | NULL, | |
920d2a44 | 4020 | show_debug_infrun, |
85c07804 | 4021 | &setdebuglist, &showdebuglist); |
527159b7 | 4022 | |
c906108c | 4023 | numsigs = (int) TARGET_SIGNAL_LAST; |
488f131b | 4024 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
4025 | signal_print = (unsigned char *) |
4026 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
4027 | signal_program = (unsigned char *) | |
4028 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
4029 | for (i = 0; i < numsigs; i++) | |
4030 | { | |
4031 | signal_stop[i] = 1; | |
4032 | signal_print[i] = 1; | |
4033 | signal_program[i] = 1; | |
4034 | } | |
4035 | ||
4036 | /* Signals caused by debugger's own actions | |
4037 | should not be given to the program afterwards. */ | |
4038 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
4039 | signal_program[TARGET_SIGNAL_INT] = 0; | |
4040 | ||
4041 | /* Signals that are not errors should not normally enter the debugger. */ | |
4042 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
4043 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
4044 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
4045 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
4046 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
4047 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
4048 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
4049 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
4050 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
4051 | signal_print[TARGET_SIGNAL_IO] = 0; | |
4052 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
4053 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
4054 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
4055 | signal_print[TARGET_SIGNAL_URG] = 0; | |
4056 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
4057 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
4058 | ||
cd0fc7c3 SS |
4059 | /* These signals are used internally by user-level thread |
4060 | implementations. (See signal(5) on Solaris.) Like the above | |
4061 | signals, a healthy program receives and handles them as part of | |
4062 | its normal operation. */ | |
4063 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
4064 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
4065 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
4066 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
4067 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
4068 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
4069 | ||
85c07804 AC |
4070 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
4071 | &stop_on_solib_events, _("\ | |
4072 | Set stopping for shared library events."), _("\ | |
4073 | Show stopping for shared library events."), _("\ | |
c906108c SS |
4074 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
4075 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 AC |
4076 | to the user would be loading/unloading of a new library."), |
4077 | NULL, | |
920d2a44 | 4078 | show_stop_on_solib_events, |
85c07804 | 4079 | &setlist, &showlist); |
c906108c | 4080 | |
7ab04401 AC |
4081 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
4082 | follow_fork_mode_kind_names, | |
4083 | &follow_fork_mode_string, _("\ | |
4084 | Set debugger response to a program call of fork or vfork."), _("\ | |
4085 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
4086 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
4087 | parent - the original process is debugged after a fork\n\ | |
4088 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 4089 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
4090 | By default, the debugger will follow the parent process."), |
4091 | NULL, | |
920d2a44 | 4092 | show_follow_fork_mode_string, |
7ab04401 AC |
4093 | &setlist, &showlist); |
4094 | ||
4095 | add_setshow_enum_cmd ("scheduler-locking", class_run, | |
4096 | scheduler_enums, &scheduler_mode, _("\ | |
4097 | Set mode for locking scheduler during execution."), _("\ | |
4098 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
4099 | off == no locking (threads may preempt at any time)\n\ |
4100 | on == full locking (no thread except the current thread may run)\n\ | |
4101 | step == scheduler locked during every single-step operation.\n\ | |
4102 | In this mode, no other thread may run during a step command.\n\ | |
7ab04401 AC |
4103 | Other threads may run while stepping over a function call ('next')."), |
4104 | set_schedlock_func, /* traps on target vector */ | |
920d2a44 | 4105 | show_scheduler_mode, |
7ab04401 | 4106 | &setlist, &showlist); |
5fbbeb29 | 4107 | |
5bf193a2 AC |
4108 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
4109 | Set mode of the step operation."), _("\ | |
4110 | Show mode of the step operation."), _("\ | |
4111 | When set, doing a step over a function without debug line information\n\ | |
4112 | will stop at the first instruction of that function. Otherwise, the\n\ | |
4113 | function is skipped and the step command stops at a different source line."), | |
4114 | NULL, | |
920d2a44 | 4115 | show_step_stop_if_no_debug, |
5bf193a2 | 4116 | &setlist, &showlist); |
ca6724c1 KB |
4117 | |
4118 | /* ptid initializations */ | |
4119 | null_ptid = ptid_build (0, 0, 0); | |
4120 | minus_one_ptid = ptid_build (-1, 0, 0); | |
4121 | inferior_ptid = null_ptid; | |
4122 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 4123 | } |