Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c AC |
3 | |
4 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, | |
c6f0559b AC |
5 | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free |
6 | 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 | |
22 | Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | Boston, MA 02111-1307, 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" | |
31 | #include "breakpoint.h" | |
03f2053f | 32 | #include "gdb_wait.h" |
c906108c SS |
33 | #include "gdbcore.h" |
34 | #include "gdbcmd.h" | |
210661e7 | 35 | #include "cli/cli-script.h" |
c906108c SS |
36 | #include "target.h" |
37 | #include "gdbthread.h" | |
38 | #include "annotate.h" | |
1adeb98a | 39 | #include "symfile.h" |
7a292a7a | 40 | #include "top.h" |
c906108c | 41 | #include <signal.h> |
2acceee2 | 42 | #include "inf-loop.h" |
4e052eda | 43 | #include "regcache.h" |
fd0407d6 | 44 | #include "value.h" |
06600e06 | 45 | #include "observer.h" |
f636b87d | 46 | #include "language.h" |
9f976b41 | 47 | #include "gdb_assert.h" |
c906108c SS |
48 | |
49 | /* Prototypes for local functions */ | |
50 | ||
96baa820 | 51 | static void signals_info (char *, int); |
c906108c | 52 | |
96baa820 | 53 | static void handle_command (char *, int); |
c906108c | 54 | |
96baa820 | 55 | static void sig_print_info (enum target_signal); |
c906108c | 56 | |
96baa820 | 57 | static void sig_print_header (void); |
c906108c | 58 | |
74b7792f | 59 | static void resume_cleanups (void *); |
c906108c | 60 | |
96baa820 | 61 | static int hook_stop_stub (void *); |
c906108c | 62 | |
96baa820 JM |
63 | static int restore_selected_frame (void *); |
64 | ||
65 | static void build_infrun (void); | |
66 | ||
4ef3f3be | 67 | static int follow_fork (void); |
96baa820 JM |
68 | |
69 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 70 | struct cmd_list_element *c); |
96baa820 | 71 | |
96baa820 JM |
72 | struct execution_control_state; |
73 | ||
74 | static int currently_stepping (struct execution_control_state *ecs); | |
75 | ||
76 | static void xdb_handle_command (char *args, int from_tty); | |
77 | ||
ea67f13b DJ |
78 | static int prepare_to_proceed (void); |
79 | ||
96baa820 | 80 | void _initialize_infrun (void); |
43ff13b4 | 81 | |
c906108c SS |
82 | int inferior_ignoring_startup_exec_events = 0; |
83 | int inferior_ignoring_leading_exec_events = 0; | |
84 | ||
5fbbeb29 CF |
85 | /* When set, stop the 'step' command if we enter a function which has |
86 | no line number information. The normal behavior is that we step | |
87 | over such function. */ | |
88 | int step_stop_if_no_debug = 0; | |
89 | ||
43ff13b4 | 90 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 91 | |
43ff13b4 JM |
92 | int sync_execution = 0; |
93 | ||
c906108c SS |
94 | /* wait_for_inferior and normal_stop use this to notify the user |
95 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
96 | running in. */ |
97 | ||
39f77062 | 98 | static ptid_t previous_inferior_ptid; |
7a292a7a SS |
99 | |
100 | /* This is true for configurations that may follow through execl() and | |
101 | similar functions. At present this is only true for HP-UX native. */ | |
102 | ||
103 | #ifndef MAY_FOLLOW_EXEC | |
104 | #define MAY_FOLLOW_EXEC (0) | |
c906108c SS |
105 | #endif |
106 | ||
7a292a7a SS |
107 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
108 | ||
d4f3574e SS |
109 | /* If the program uses ELF-style shared libraries, then calls to |
110 | functions in shared libraries go through stubs, which live in a | |
111 | table called the PLT (Procedure Linkage Table). The first time the | |
112 | function is called, the stub sends control to the dynamic linker, | |
113 | which looks up the function's real address, patches the stub so | |
114 | that future calls will go directly to the function, and then passes | |
115 | control to the function. | |
116 | ||
117 | If we are stepping at the source level, we don't want to see any of | |
118 | this --- we just want to skip over the stub and the dynamic linker. | |
119 | The simple approach is to single-step until control leaves the | |
120 | dynamic linker. | |
121 | ||
ca557f44 AC |
122 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
123 | dynamic linker calls functions in the shared C library, so you | |
124 | can't tell from the PC alone whether the dynamic linker is still | |
125 | running. In this case, we use a step-resume breakpoint to get us | |
126 | past the dynamic linker, as if we were using "next" to step over a | |
127 | function call. | |
d4f3574e SS |
128 | |
129 | IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic | |
130 | linker code or not. Normally, this means we single-step. However, | |
131 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
132 | address where we can place a step-resume breakpoint to get past the | |
133 | linker's symbol resolution function. | |
134 | ||
135 | IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a | |
136 | pretty portable way, by comparing the PC against the address ranges | |
137 | of the dynamic linker's sections. | |
138 | ||
139 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
140 | it depends on internal details of the dynamic linker. It's usually | |
141 | not too hard to figure out where to put a breakpoint, but it | |
142 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
143 | sanity checking. If it can't figure things out, returning zero and | |
144 | getting the (possibly confusing) stepping behavior is better than | |
145 | signalling an error, which will obscure the change in the | |
146 | inferior's state. */ | |
c906108c SS |
147 | |
148 | #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
149 | #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 | |
150 | #endif | |
151 | ||
c906108c SS |
152 | /* This function returns TRUE if pc is the address of an instruction |
153 | that lies within the dynamic linker (such as the event hook, or the | |
154 | dld itself). | |
155 | ||
156 | This function must be used only when a dynamic linker event has | |
157 | been caught, and the inferior is being stepped out of the hook, or | |
158 | undefined results are guaranteed. */ | |
159 | ||
160 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
161 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
162 | #endif | |
163 | ||
164 | /* On MIPS16, a function that returns a floating point value may call | |
165 | a library helper function to copy the return value to a floating point | |
166 | register. The IGNORE_HELPER_CALL macro returns non-zero if we | |
167 | should ignore (i.e. step over) this function call. */ | |
168 | #ifndef IGNORE_HELPER_CALL | |
169 | #define IGNORE_HELPER_CALL(pc) 0 | |
170 | #endif | |
171 | ||
172 | /* On some systems, the PC may be left pointing at an instruction that won't | |
173 | actually be executed. This is usually indicated by a bit in the PSW. If | |
174 | we find ourselves in such a state, then we step the target beyond the | |
175 | nullified instruction before returning control to the user so as to avoid | |
176 | confusion. */ | |
177 | ||
178 | #ifndef INSTRUCTION_NULLIFIED | |
179 | #define INSTRUCTION_NULLIFIED 0 | |
180 | #endif | |
181 | ||
c2c6d25f JM |
182 | /* We can't step off a permanent breakpoint in the ordinary way, because we |
183 | can't remove it. Instead, we have to advance the PC to the next | |
184 | instruction. This macro should expand to a pointer to a function that | |
185 | does that, or zero if we have no such function. If we don't have a | |
186 | definition for it, we have to report an error. */ | |
488f131b | 187 | #ifndef SKIP_PERMANENT_BREAKPOINT |
c2c6d25f JM |
188 | #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint) |
189 | static void | |
c2d11a7d | 190 | default_skip_permanent_breakpoint (void) |
c2c6d25f | 191 | { |
255e7dbf | 192 | error ("\ |
c2c6d25f JM |
193 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ |
194 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
255e7dbf | 195 | a command like `return' or `jump' to continue execution."); |
c2c6d25f JM |
196 | } |
197 | #endif | |
488f131b | 198 | |
c2c6d25f | 199 | |
7a292a7a SS |
200 | /* Convert the #defines into values. This is temporary until wfi control |
201 | flow is completely sorted out. */ | |
202 | ||
203 | #ifndef HAVE_STEPPABLE_WATCHPOINT | |
204 | #define HAVE_STEPPABLE_WATCHPOINT 0 | |
205 | #else | |
206 | #undef HAVE_STEPPABLE_WATCHPOINT | |
207 | #define HAVE_STEPPABLE_WATCHPOINT 1 | |
208 | #endif | |
209 | ||
692590c1 MS |
210 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
211 | #define CANNOT_STEP_HW_WATCHPOINTS 0 | |
212 | #else | |
213 | #undef CANNOT_STEP_HW_WATCHPOINTS | |
214 | #define CANNOT_STEP_HW_WATCHPOINTS 1 | |
215 | #endif | |
216 | ||
c906108c SS |
217 | /* Tables of how to react to signals; the user sets them. */ |
218 | ||
219 | static unsigned char *signal_stop; | |
220 | static unsigned char *signal_print; | |
221 | static unsigned char *signal_program; | |
222 | ||
223 | #define SET_SIGS(nsigs,sigs,flags) \ | |
224 | do { \ | |
225 | int signum = (nsigs); \ | |
226 | while (signum-- > 0) \ | |
227 | if ((sigs)[signum]) \ | |
228 | (flags)[signum] = 1; \ | |
229 | } while (0) | |
230 | ||
231 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
232 | do { \ | |
233 | int signum = (nsigs); \ | |
234 | while (signum-- > 0) \ | |
235 | if ((sigs)[signum]) \ | |
236 | (flags)[signum] = 0; \ | |
237 | } while (0) | |
238 | ||
39f77062 KB |
239 | /* Value to pass to target_resume() to cause all threads to resume */ |
240 | ||
241 | #define RESUME_ALL (pid_to_ptid (-1)) | |
c906108c SS |
242 | |
243 | /* Command list pointer for the "stop" placeholder. */ | |
244 | ||
245 | static struct cmd_list_element *stop_command; | |
246 | ||
247 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
248 | ||
249 | static int breakpoints_inserted; | |
250 | ||
251 | /* Function inferior was in as of last step command. */ | |
252 | ||
253 | static struct symbol *step_start_function; | |
254 | ||
255 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
256 | ||
257 | static int trap_expected; | |
258 | ||
259 | #ifdef SOLIB_ADD | |
260 | /* Nonzero if we want to give control to the user when we're notified | |
261 | of shared library events by the dynamic linker. */ | |
262 | static int stop_on_solib_events; | |
263 | #endif | |
264 | ||
c906108c SS |
265 | /* Nonzero means expecting a trace trap |
266 | and should stop the inferior and return silently when it happens. */ | |
267 | ||
268 | int stop_after_trap; | |
269 | ||
270 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
271 | It is used after attach, due to attaching to a process; | |
272 | when running in the shell before the child program has been exec'd; | |
273 | and when running some kinds of remote stuff (FIXME?). */ | |
274 | ||
c0236d92 | 275 | enum stop_kind stop_soon; |
c906108c SS |
276 | |
277 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
278 | situation when stop_registers should be saved. */ | |
279 | ||
280 | int proceed_to_finish; | |
281 | ||
282 | /* Save register contents here when about to pop a stack dummy frame, | |
283 | if-and-only-if proceed_to_finish is set. | |
284 | Thus this contains the return value from the called function (assuming | |
285 | values are returned in a register). */ | |
286 | ||
72cec141 | 287 | struct regcache *stop_registers; |
c906108c SS |
288 | |
289 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
290 | ||
291 | static int breakpoints_failed; | |
292 | ||
293 | /* Nonzero after stop if current stack frame should be printed. */ | |
294 | ||
295 | static int stop_print_frame; | |
296 | ||
297 | static struct breakpoint *step_resume_breakpoint = NULL; | |
c906108c SS |
298 | |
299 | /* On some platforms (e.g., HP-UX), hardware watchpoints have bad | |
300 | interactions with an inferior that is running a kernel function | |
301 | (aka, a system call or "syscall"). wait_for_inferior therefore | |
302 | may have a need to know when the inferior is in a syscall. This | |
303 | is a count of the number of inferior threads which are known to | |
304 | currently be running in a syscall. */ | |
305 | static int number_of_threads_in_syscalls; | |
306 | ||
e02bc4cc | 307 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
308 | returned by target_wait()/deprecated_target_wait_hook(). This |
309 | information is returned by get_last_target_status(). */ | |
39f77062 | 310 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
311 | static struct target_waitstatus target_last_waitstatus; |
312 | ||
c906108c SS |
313 | /* This is used to remember when a fork, vfork or exec event |
314 | was caught by a catchpoint, and thus the event is to be | |
315 | followed at the next resume of the inferior, and not | |
316 | immediately. */ | |
317 | static struct | |
488f131b JB |
318 | { |
319 | enum target_waitkind kind; | |
320 | struct | |
c906108c | 321 | { |
488f131b | 322 | int parent_pid; |
488f131b | 323 | int child_pid; |
c906108c | 324 | } |
488f131b JB |
325 | fork_event; |
326 | char *execd_pathname; | |
327 | } | |
c906108c SS |
328 | pending_follow; |
329 | ||
53904c9e AC |
330 | static const char follow_fork_mode_child[] = "child"; |
331 | static const char follow_fork_mode_parent[] = "parent"; | |
332 | ||
488f131b | 333 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e AC |
334 | follow_fork_mode_child, |
335 | follow_fork_mode_parent, | |
336 | NULL | |
ef346e04 | 337 | }; |
c906108c | 338 | |
53904c9e | 339 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
c906108c SS |
340 | \f |
341 | ||
6604731b | 342 | static int |
4ef3f3be | 343 | follow_fork (void) |
c906108c | 344 | { |
ea1dd7bc | 345 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
c906108c | 346 | |
6604731b | 347 | return target_follow_fork (follow_child); |
c906108c SS |
348 | } |
349 | ||
6604731b DJ |
350 | void |
351 | follow_inferior_reset_breakpoints (void) | |
c906108c | 352 | { |
6604731b DJ |
353 | /* Was there a step_resume breakpoint? (There was if the user |
354 | did a "next" at the fork() call.) If so, explicitly reset its | |
355 | thread number. | |
356 | ||
357 | step_resumes are a form of bp that are made to be per-thread. | |
358 | Since we created the step_resume bp when the parent process | |
359 | was being debugged, and now are switching to the child process, | |
360 | from the breakpoint package's viewpoint, that's a switch of | |
361 | "threads". We must update the bp's notion of which thread | |
362 | it is for, or it'll be ignored when it triggers. */ | |
363 | ||
364 | if (step_resume_breakpoint) | |
365 | breakpoint_re_set_thread (step_resume_breakpoint); | |
366 | ||
367 | /* Reinsert all breakpoints in the child. The user may have set | |
368 | breakpoints after catching the fork, in which case those | |
369 | were never set in the child, but only in the parent. This makes | |
370 | sure the inserted breakpoints match the breakpoint list. */ | |
371 | ||
372 | breakpoint_re_set (); | |
373 | insert_breakpoints (); | |
c906108c | 374 | } |
c906108c | 375 | |
1adeb98a FN |
376 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
377 | ||
c906108c | 378 | static void |
96baa820 | 379 | follow_exec (int pid, char *execd_pathname) |
c906108c | 380 | { |
c906108c | 381 | int saved_pid = pid; |
7a292a7a SS |
382 | struct target_ops *tgt; |
383 | ||
384 | if (!may_follow_exec) | |
385 | return; | |
c906108c | 386 | |
c906108c SS |
387 | /* This is an exec event that we actually wish to pay attention to. |
388 | Refresh our symbol table to the newly exec'd program, remove any | |
389 | momentary bp's, etc. | |
390 | ||
391 | If there are breakpoints, they aren't really inserted now, | |
392 | since the exec() transformed our inferior into a fresh set | |
393 | of instructions. | |
394 | ||
395 | We want to preserve symbolic breakpoints on the list, since | |
396 | we have hopes that they can be reset after the new a.out's | |
397 | symbol table is read. | |
398 | ||
399 | However, any "raw" breakpoints must be removed from the list | |
400 | (e.g., the solib bp's), since their address is probably invalid | |
401 | now. | |
402 | ||
403 | And, we DON'T want to call delete_breakpoints() here, since | |
404 | that may write the bp's "shadow contents" (the instruction | |
405 | value that was overwritten witha TRAP instruction). Since | |
406 | we now have a new a.out, those shadow contents aren't valid. */ | |
407 | update_breakpoints_after_exec (); | |
408 | ||
409 | /* If there was one, it's gone now. We cannot truly step-to-next | |
410 | statement through an exec(). */ | |
411 | step_resume_breakpoint = NULL; | |
412 | step_range_start = 0; | |
413 | step_range_end = 0; | |
414 | ||
c906108c SS |
415 | /* What is this a.out's name? */ |
416 | printf_unfiltered ("Executing new program: %s\n", execd_pathname); | |
417 | ||
418 | /* We've followed the inferior through an exec. Therefore, the | |
419 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
420 | |
421 | /* First collect the run target in effect. */ | |
422 | tgt = find_run_target (); | |
423 | /* If we can't find one, things are in a very strange state... */ | |
424 | if (tgt == NULL) | |
425 | error ("Could find run target to save before following exec"); | |
426 | ||
c906108c SS |
427 | gdb_flush (gdb_stdout); |
428 | target_mourn_inferior (); | |
39f77062 | 429 | inferior_ptid = pid_to_ptid (saved_pid); |
488f131b | 430 | /* Because mourn_inferior resets inferior_ptid. */ |
7a292a7a | 431 | push_target (tgt); |
c906108c SS |
432 | |
433 | /* That a.out is now the one to use. */ | |
434 | exec_file_attach (execd_pathname, 0); | |
435 | ||
436 | /* And also is where symbols can be found. */ | |
1adeb98a | 437 | symbol_file_add_main (execd_pathname, 0); |
c906108c SS |
438 | |
439 | /* Reset the shared library package. This ensures that we get | |
440 | a shlib event when the child reaches "_start", at which point | |
441 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 442 | #if defined(SOLIB_RESTART) |
c906108c | 443 | SOLIB_RESTART (); |
7a292a7a SS |
444 | #endif |
445 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
39f77062 | 446 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
7a292a7a | 447 | #endif |
c906108c SS |
448 | |
449 | /* Reinsert all breakpoints. (Those which were symbolic have | |
450 | been reset to the proper address in the new a.out, thanks | |
451 | to symbol_file_command...) */ | |
452 | insert_breakpoints (); | |
453 | ||
454 | /* The next resume of this inferior should bring it to the shlib | |
455 | startup breakpoints. (If the user had also set bp's on | |
456 | "main" from the old (parent) process, then they'll auto- | |
457 | matically get reset there in the new process.) */ | |
c906108c SS |
458 | } |
459 | ||
460 | /* Non-zero if we just simulating a single-step. This is needed | |
461 | because we cannot remove the breakpoints in the inferior process | |
462 | until after the `wait' in `wait_for_inferior'. */ | |
463 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
464 | |
465 | /* The thread we inserted single-step breakpoints for. */ | |
466 | static ptid_t singlestep_ptid; | |
467 | ||
468 | /* If another thread hit the singlestep breakpoint, we save the original | |
469 | thread here so that we can resume single-stepping it later. */ | |
470 | static ptid_t saved_singlestep_ptid; | |
471 | static int stepping_past_singlestep_breakpoint; | |
c906108c SS |
472 | \f |
473 | ||
474 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 475 | static void |
74b7792f | 476 | resume_cleanups (void *ignore) |
c906108c SS |
477 | { |
478 | normal_stop (); | |
479 | } | |
480 | ||
53904c9e AC |
481 | static const char schedlock_off[] = "off"; |
482 | static const char schedlock_on[] = "on"; | |
483 | static const char schedlock_step[] = "step"; | |
484 | static const char *scheduler_mode = schedlock_off; | |
488f131b | 485 | static const char *scheduler_enums[] = { |
ef346e04 AC |
486 | schedlock_off, |
487 | schedlock_on, | |
488 | schedlock_step, | |
489 | NULL | |
490 | }; | |
c906108c SS |
491 | |
492 | static void | |
96baa820 | 493 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 494 | { |
1868c04e AC |
495 | /* NOTE: cagney/2002-03-17: The add_show_from_set() function clones |
496 | the set command passed as a parameter. The clone operation will | |
497 | include (BUG?) any ``set'' command callback, if present. | |
498 | Commands like ``info set'' call all the ``show'' command | |
ce2826aa | 499 | callbacks. Unfortunately, for ``show'' commands cloned from |
1868c04e AC |
500 | ``set'', this includes callbacks belonging to ``set'' commands. |
501 | Making this worse, this only occures if add_show_from_set() is | |
502 | called after add_cmd_sfunc() (BUG?). */ | |
503 | if (cmd_type (c) == set_cmd) | |
c906108c SS |
504 | if (!target_can_lock_scheduler) |
505 | { | |
506 | scheduler_mode = schedlock_off; | |
488f131b | 507 | error ("Target '%s' cannot support this command.", target_shortname); |
c906108c SS |
508 | } |
509 | } | |
510 | ||
511 | ||
512 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
513 | wants to interrupt some lengthy single-stepping operation | |
514 | (for child processes, the SIGINT goes to the inferior, and so | |
515 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
516 | other targets, that's not true). | |
517 | ||
518 | STEP nonzero if we should step (zero to continue instead). | |
519 | SIG is the signal to give the inferior (zero for none). */ | |
520 | void | |
96baa820 | 521 | resume (int step, enum target_signal sig) |
c906108c SS |
522 | { |
523 | int should_resume = 1; | |
74b7792f | 524 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
c906108c SS |
525 | QUIT; |
526 | ||
ef5cf84e MS |
527 | /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */ |
528 | ||
c906108c | 529 | |
692590c1 MS |
530 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
531 | over an instruction that causes a page fault without triggering | |
532 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
533 | stop, because the hardware watchpoint is not triggered, but it forgets | |
534 | the step request and continues the program normally. | |
535 | Work around the problem by removing hardware watchpoints if a step is | |
536 | requested, GDB will check for a hardware watchpoint trigger after the | |
537 | step anyway. */ | |
538 | if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) | |
539 | remove_hw_watchpoints (); | |
488f131b | 540 | |
692590c1 | 541 | |
c2c6d25f JM |
542 | /* Normally, by the time we reach `resume', the breakpoints are either |
543 | removed or inserted, as appropriate. The exception is if we're sitting | |
544 | at a permanent breakpoint; we need to step over it, but permanent | |
545 | breakpoints can't be removed. So we have to test for it here. */ | |
546 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
547 | SKIP_PERMANENT_BREAKPOINT (); | |
548 | ||
b0ed3589 | 549 | if (SOFTWARE_SINGLE_STEP_P () && step) |
c906108c SS |
550 | { |
551 | /* Do it the hard way, w/temp breakpoints */ | |
c5aa993b | 552 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
c906108c SS |
553 | /* ...and don't ask hardware to do it. */ |
554 | step = 0; | |
555 | /* and do not pull these breakpoints until after a `wait' in | |
556 | `wait_for_inferior' */ | |
557 | singlestep_breakpoints_inserted_p = 1; | |
9f976b41 | 558 | singlestep_ptid = inferior_ptid; |
c906108c SS |
559 | } |
560 | ||
c906108c | 561 | /* If there were any forks/vforks/execs that were caught and are |
6604731b | 562 | now to be followed, then do so. */ |
c906108c SS |
563 | switch (pending_follow.kind) |
564 | { | |
6604731b DJ |
565 | case TARGET_WAITKIND_FORKED: |
566 | case TARGET_WAITKIND_VFORKED: | |
c906108c | 567 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
6604731b DJ |
568 | if (follow_fork ()) |
569 | should_resume = 0; | |
c906108c SS |
570 | break; |
571 | ||
6604731b | 572 | case TARGET_WAITKIND_EXECD: |
c906108c | 573 | /* follow_exec is called as soon as the exec event is seen. */ |
6604731b | 574 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
c906108c SS |
575 | break; |
576 | ||
577 | default: | |
578 | break; | |
579 | } | |
c906108c SS |
580 | |
581 | /* Install inferior's terminal modes. */ | |
582 | target_terminal_inferior (); | |
583 | ||
584 | if (should_resume) | |
585 | { | |
39f77062 | 586 | ptid_t resume_ptid; |
dfcd3bfb | 587 | |
488f131b | 588 | resume_ptid = RESUME_ALL; /* Default */ |
ef5cf84e MS |
589 | |
590 | if ((step || singlestep_breakpoints_inserted_p) && | |
9f976b41 DJ |
591 | (stepping_past_singlestep_breakpoint |
592 | || (!breakpoints_inserted && breakpoint_here_p (read_pc ())))) | |
c906108c | 593 | { |
ef5cf84e MS |
594 | /* Stepping past a breakpoint without inserting breakpoints. |
595 | Make sure only the current thread gets to step, so that | |
596 | other threads don't sneak past breakpoints while they are | |
597 | not inserted. */ | |
c906108c | 598 | |
ef5cf84e | 599 | resume_ptid = inferior_ptid; |
c906108c | 600 | } |
ef5cf84e MS |
601 | |
602 | if ((scheduler_mode == schedlock_on) || | |
488f131b | 603 | (scheduler_mode == schedlock_step && |
ef5cf84e | 604 | (step || singlestep_breakpoints_inserted_p))) |
c906108c | 605 | { |
ef5cf84e | 606 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 607 | resume_ptid = inferior_ptid; |
c906108c | 608 | } |
ef5cf84e | 609 | |
c4ed33b9 AC |
610 | if (CANNOT_STEP_BREAKPOINT) |
611 | { | |
612 | /* Most targets can step a breakpoint instruction, thus | |
613 | executing it normally. But if this one cannot, just | |
614 | continue and we will hit it anyway. */ | |
615 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
616 | step = 0; | |
617 | } | |
39f77062 | 618 | target_resume (resume_ptid, step, sig); |
c906108c SS |
619 | } |
620 | ||
621 | discard_cleanups (old_cleanups); | |
622 | } | |
623 | \f | |
624 | ||
625 | /* Clear out all variables saying what to do when inferior is continued. | |
626 | First do this, then set the ones you want, then call `proceed'. */ | |
627 | ||
628 | void | |
96baa820 | 629 | clear_proceed_status (void) |
c906108c SS |
630 | { |
631 | trap_expected = 0; | |
632 | step_range_start = 0; | |
633 | step_range_end = 0; | |
aa0cd9c1 | 634 | step_frame_id = null_frame_id; |
5fbbeb29 | 635 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c | 636 | stop_after_trap = 0; |
c0236d92 | 637 | stop_soon = NO_STOP_QUIETLY; |
c906108c SS |
638 | proceed_to_finish = 0; |
639 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
640 | ||
641 | /* Discard any remaining commands or status from previous stop. */ | |
642 | bpstat_clear (&stop_bpstat); | |
643 | } | |
644 | ||
ea67f13b DJ |
645 | /* This should be suitable for any targets that support threads. */ |
646 | ||
647 | static int | |
648 | prepare_to_proceed (void) | |
649 | { | |
650 | ptid_t wait_ptid; | |
651 | struct target_waitstatus wait_status; | |
652 | ||
653 | /* Get the last target status returned by target_wait(). */ | |
654 | get_last_target_status (&wait_ptid, &wait_status); | |
655 | ||
656 | /* Make sure we were stopped either at a breakpoint, or because | |
657 | of a Ctrl-C. */ | |
658 | if (wait_status.kind != TARGET_WAITKIND_STOPPED | |
659 | || (wait_status.value.sig != TARGET_SIGNAL_TRAP && | |
660 | wait_status.value.sig != TARGET_SIGNAL_INT)) | |
661 | { | |
662 | return 0; | |
663 | } | |
664 | ||
665 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
666 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
667 | { | |
668 | /* Switched over from WAIT_PID. */ | |
669 | CORE_ADDR wait_pc = read_pc_pid (wait_ptid); | |
670 | ||
671 | if (wait_pc != read_pc ()) | |
672 | { | |
673 | /* Switch back to WAIT_PID thread. */ | |
674 | inferior_ptid = wait_ptid; | |
675 | ||
676 | /* FIXME: This stuff came from switch_to_thread() in | |
677 | thread.c (which should probably be a public function). */ | |
678 | flush_cached_frames (); | |
679 | registers_changed (); | |
680 | stop_pc = wait_pc; | |
681 | select_frame (get_current_frame ()); | |
682 | } | |
683 | ||
684 | /* We return 1 to indicate that there is a breakpoint here, | |
685 | so we need to step over it before continuing to avoid | |
686 | hitting it straight away. */ | |
687 | if (breakpoint_here_p (wait_pc)) | |
688 | return 1; | |
689 | } | |
690 | ||
691 | return 0; | |
692 | ||
693 | } | |
e4846b08 JJ |
694 | |
695 | /* Record the pc of the program the last time it stopped. This is | |
696 | just used internally by wait_for_inferior, but need to be preserved | |
697 | over calls to it and cleared when the inferior is started. */ | |
698 | static CORE_ADDR prev_pc; | |
699 | ||
c906108c SS |
700 | /* Basic routine for continuing the program in various fashions. |
701 | ||
702 | ADDR is the address to resume at, or -1 for resume where stopped. | |
703 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 704 | or -1 for act according to how it stopped. |
c906108c | 705 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
706 | -1 means return after that and print nothing. |
707 | You should probably set various step_... variables | |
708 | before calling here, if you are stepping. | |
c906108c SS |
709 | |
710 | You should call clear_proceed_status before calling proceed. */ | |
711 | ||
712 | void | |
96baa820 | 713 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
714 | { |
715 | int oneproc = 0; | |
716 | ||
717 | if (step > 0) | |
718 | step_start_function = find_pc_function (read_pc ()); | |
719 | if (step < 0) | |
720 | stop_after_trap = 1; | |
721 | ||
2acceee2 | 722 | if (addr == (CORE_ADDR) -1) |
c906108c SS |
723 | { |
724 | /* If there is a breakpoint at the address we will resume at, | |
c5aa993b JM |
725 | step one instruction before inserting breakpoints |
726 | so that we do not stop right away (and report a second | |
c906108c SS |
727 | hit at this breakpoint). */ |
728 | ||
729 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) | |
730 | oneproc = 1; | |
731 | ||
732 | #ifndef STEP_SKIPS_DELAY | |
733 | #define STEP_SKIPS_DELAY(pc) (0) | |
734 | #define STEP_SKIPS_DELAY_P (0) | |
735 | #endif | |
736 | /* Check breakpoint_here_p first, because breakpoint_here_p is fast | |
c5aa993b JM |
737 | (it just checks internal GDB data structures) and STEP_SKIPS_DELAY |
738 | is slow (it needs to read memory from the target). */ | |
c906108c SS |
739 | if (STEP_SKIPS_DELAY_P |
740 | && breakpoint_here_p (read_pc () + 4) | |
741 | && STEP_SKIPS_DELAY (read_pc ())) | |
742 | oneproc = 1; | |
743 | } | |
744 | else | |
745 | { | |
746 | write_pc (addr); | |
c906108c SS |
747 | } |
748 | ||
c906108c SS |
749 | /* In a multi-threaded task we may select another thread |
750 | and then continue or step. | |
751 | ||
752 | But if the old thread was stopped at a breakpoint, it | |
753 | will immediately cause another breakpoint stop without | |
754 | any execution (i.e. it will report a breakpoint hit | |
755 | incorrectly). So we must step over it first. | |
756 | ||
ea67f13b | 757 | prepare_to_proceed checks the current thread against the thread |
c906108c SS |
758 | that reported the most recent event. If a step-over is required |
759 | it returns TRUE and sets the current thread to the old thread. */ | |
ea67f13b DJ |
760 | if (prepare_to_proceed () && breakpoint_here_p (read_pc ())) |
761 | oneproc = 1; | |
c906108c | 762 | |
c906108c SS |
763 | if (oneproc) |
764 | /* We will get a trace trap after one instruction. | |
765 | Continue it automatically and insert breakpoints then. */ | |
766 | trap_expected = 1; | |
767 | else | |
768 | { | |
81d0cc19 GS |
769 | insert_breakpoints (); |
770 | /* If we get here there was no call to error() in | |
771 | insert breakpoints -- so they were inserted. */ | |
c906108c SS |
772 | breakpoints_inserted = 1; |
773 | } | |
774 | ||
775 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
776 | stop_signal = siggnal; | |
777 | /* If this signal should not be seen by program, | |
778 | give it zero. Used for debugging signals. */ | |
779 | else if (!signal_program[stop_signal]) | |
780 | stop_signal = TARGET_SIGNAL_0; | |
781 | ||
782 | annotate_starting (); | |
783 | ||
784 | /* Make sure that output from GDB appears before output from the | |
785 | inferior. */ | |
786 | gdb_flush (gdb_stdout); | |
787 | ||
e4846b08 JJ |
788 | /* Refresh prev_pc value just prior to resuming. This used to be |
789 | done in stop_stepping, however, setting prev_pc there did not handle | |
790 | scenarios such as inferior function calls or returning from | |
791 | a function via the return command. In those cases, the prev_pc | |
792 | value was not set properly for subsequent commands. The prev_pc value | |
793 | is used to initialize the starting line number in the ecs. With an | |
794 | invalid value, the gdb next command ends up stopping at the position | |
795 | represented by the next line table entry past our start position. | |
796 | On platforms that generate one line table entry per line, this | |
797 | is not a problem. However, on the ia64, the compiler generates | |
798 | extraneous line table entries that do not increase the line number. | |
799 | When we issue the gdb next command on the ia64 after an inferior call | |
800 | or a return command, we often end up a few instructions forward, still | |
801 | within the original line we started. | |
802 | ||
803 | An attempt was made to have init_execution_control_state () refresh | |
804 | the prev_pc value before calculating the line number. This approach | |
805 | did not work because on platforms that use ptrace, the pc register | |
806 | cannot be read unless the inferior is stopped. At that point, we | |
807 | are not guaranteed the inferior is stopped and so the read_pc () | |
808 | call can fail. Setting the prev_pc value here ensures the value is | |
809 | updated correctly when the inferior is stopped. */ | |
810 | prev_pc = read_pc (); | |
811 | ||
c906108c SS |
812 | /* Resume inferior. */ |
813 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
814 | ||
815 | /* Wait for it to stop (if not standalone) | |
816 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
817 | /* Do this only if we are not using the event loop, or if the target |
818 | does not support asynchronous execution. */ | |
6426a772 | 819 | if (!event_loop_p || !target_can_async_p ()) |
43ff13b4 JM |
820 | { |
821 | wait_for_inferior (); | |
822 | normal_stop (); | |
823 | } | |
c906108c | 824 | } |
c906108c SS |
825 | \f |
826 | ||
827 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 828 | |
c906108c | 829 | void |
96baa820 | 830 | start_remote (void) |
c906108c SS |
831 | { |
832 | init_thread_list (); | |
833 | init_wait_for_inferior (); | |
c0236d92 | 834 | stop_soon = STOP_QUIETLY; |
c906108c | 835 | trap_expected = 0; |
43ff13b4 | 836 | |
6426a772 JM |
837 | /* Always go on waiting for the target, regardless of the mode. */ |
838 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 839 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
840 | nothing is returned (instead of just blocking). Because of this, |
841 | targets expecting an immediate response need to, internally, set | |
842 | things up so that the target_wait() is forced to eventually | |
843 | timeout. */ | |
844 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
845 | differentiate to its caller what the state of the target is after | |
846 | the initial open has been performed. Here we're assuming that | |
847 | the target has stopped. It should be possible to eventually have | |
848 | target_open() return to the caller an indication that the target | |
849 | is currently running and GDB state should be set to the same as | |
850 | for an async run. */ | |
851 | wait_for_inferior (); | |
852 | normal_stop (); | |
c906108c SS |
853 | } |
854 | ||
855 | /* Initialize static vars when a new inferior begins. */ | |
856 | ||
857 | void | |
96baa820 | 858 | init_wait_for_inferior (void) |
c906108c SS |
859 | { |
860 | /* These are meaningless until the first time through wait_for_inferior. */ | |
861 | prev_pc = 0; | |
c906108c | 862 | |
c906108c SS |
863 | breakpoints_inserted = 0; |
864 | breakpoint_init_inferior (inf_starting); | |
865 | ||
866 | /* Don't confuse first call to proceed(). */ | |
867 | stop_signal = TARGET_SIGNAL_0; | |
868 | ||
869 | /* The first resume is not following a fork/vfork/exec. */ | |
870 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
c906108c SS |
871 | |
872 | /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ | |
873 | number_of_threads_in_syscalls = 0; | |
874 | ||
875 | clear_proceed_status (); | |
9f976b41 DJ |
876 | |
877 | stepping_past_singlestep_breakpoint = 0; | |
c906108c | 878 | } |
c906108c | 879 | \f |
b83266a0 SS |
880 | /* This enum encodes possible reasons for doing a target_wait, so that |
881 | wfi can call target_wait in one place. (Ultimately the call will be | |
882 | moved out of the infinite loop entirely.) */ | |
883 | ||
c5aa993b JM |
884 | enum infwait_states |
885 | { | |
cd0fc7c3 SS |
886 | infwait_normal_state, |
887 | infwait_thread_hop_state, | |
888 | infwait_nullified_state, | |
889 | infwait_nonstep_watch_state | |
b83266a0 SS |
890 | }; |
891 | ||
11cf8741 JM |
892 | /* Why did the inferior stop? Used to print the appropriate messages |
893 | to the interface from within handle_inferior_event(). */ | |
894 | enum inferior_stop_reason | |
895 | { | |
896 | /* We don't know why. */ | |
897 | STOP_UNKNOWN, | |
898 | /* Step, next, nexti, stepi finished. */ | |
899 | END_STEPPING_RANGE, | |
900 | /* Found breakpoint. */ | |
901 | BREAKPOINT_HIT, | |
902 | /* Inferior terminated by signal. */ | |
903 | SIGNAL_EXITED, | |
904 | /* Inferior exited. */ | |
905 | EXITED, | |
906 | /* Inferior received signal, and user asked to be notified. */ | |
907 | SIGNAL_RECEIVED | |
908 | }; | |
909 | ||
cd0fc7c3 SS |
910 | /* This structure contains what used to be local variables in |
911 | wait_for_inferior. Probably many of them can return to being | |
912 | locals in handle_inferior_event. */ | |
913 | ||
c5aa993b | 914 | struct execution_control_state |
488f131b JB |
915 | { |
916 | struct target_waitstatus ws; | |
917 | struct target_waitstatus *wp; | |
918 | int another_trap; | |
919 | int random_signal; | |
920 | CORE_ADDR stop_func_start; | |
921 | CORE_ADDR stop_func_end; | |
922 | char *stop_func_name; | |
923 | struct symtab_and_line sal; | |
924 | int remove_breakpoints_on_following_step; | |
925 | int current_line; | |
926 | struct symtab *current_symtab; | |
927 | int handling_longjmp; /* FIXME */ | |
928 | ptid_t ptid; | |
929 | ptid_t saved_inferior_ptid; | |
488f131b JB |
930 | int stepping_through_solib_after_catch; |
931 | bpstat stepping_through_solib_catchpoints; | |
932 | int enable_hw_watchpoints_after_wait; | |
933 | int stepping_through_sigtramp; | |
934 | int new_thread_event; | |
935 | struct target_waitstatus tmpstatus; | |
936 | enum infwait_states infwait_state; | |
937 | ptid_t waiton_ptid; | |
938 | int wait_some_more; | |
939 | }; | |
940 | ||
941 | void init_execution_control_state (struct execution_control_state *ecs); | |
942 | ||
943 | void handle_inferior_event (struct execution_control_state *ecs); | |
cd0fc7c3 | 944 | |
c2c6d25f | 945 | static void step_into_function (struct execution_control_state *ecs); |
d303a6c7 AC |
946 | static void insert_step_resume_breakpoint (struct frame_info *step_frame, |
947 | struct execution_control_state *ecs); | |
104c1213 JM |
948 | static void stop_stepping (struct execution_control_state *ecs); |
949 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 950 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
951 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
952 | int stop_info); | |
104c1213 | 953 | |
cd0fc7c3 SS |
954 | /* Wait for control to return from inferior to debugger. |
955 | If inferior gets a signal, we may decide to start it up again | |
956 | instead of returning. That is why there is a loop in this function. | |
957 | When this function actually returns it means the inferior | |
958 | should be left stopped and GDB should read more commands. */ | |
959 | ||
960 | void | |
96baa820 | 961 | wait_for_inferior (void) |
cd0fc7c3 SS |
962 | { |
963 | struct cleanup *old_cleanups; | |
964 | struct execution_control_state ecss; | |
965 | struct execution_control_state *ecs; | |
c906108c | 966 | |
8601f500 | 967 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c | 968 | &step_resume_breakpoint); |
cd0fc7c3 SS |
969 | |
970 | /* wfi still stays in a loop, so it's OK just to take the address of | |
971 | a local to get the ecs pointer. */ | |
972 | ecs = &ecss; | |
973 | ||
974 | /* Fill in with reasonable starting values. */ | |
975 | init_execution_control_state (ecs); | |
976 | ||
c906108c | 977 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 978 | previous_inferior_ptid = inferior_ptid; |
c906108c | 979 | |
cd0fc7c3 SS |
980 | overlay_cache_invalid = 1; |
981 | ||
982 | /* We have to invalidate the registers BEFORE calling target_wait | |
983 | because they can be loaded from the target while in target_wait. | |
984 | This makes remote debugging a bit more efficient for those | |
985 | targets that provide critical registers as part of their normal | |
986 | status mechanism. */ | |
987 | ||
988 | registers_changed (); | |
b83266a0 | 989 | |
c906108c SS |
990 | while (1) |
991 | { | |
9a4105ab AC |
992 | if (deprecated_target_wait_hook) |
993 | ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp); | |
cd0fc7c3 | 994 | else |
39f77062 | 995 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
c906108c | 996 | |
cd0fc7c3 SS |
997 | /* Now figure out what to do with the result of the result. */ |
998 | handle_inferior_event (ecs); | |
c906108c | 999 | |
cd0fc7c3 SS |
1000 | if (!ecs->wait_some_more) |
1001 | break; | |
1002 | } | |
1003 | do_cleanups (old_cleanups); | |
1004 | } | |
c906108c | 1005 | |
43ff13b4 JM |
1006 | /* Asynchronous version of wait_for_inferior. It is called by the |
1007 | event loop whenever a change of state is detected on the file | |
1008 | descriptor corresponding to the target. It can be called more than | |
1009 | once to complete a single execution command. In such cases we need | |
1010 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1011 | last time that this function is called for a single execution | |
1012 | command, then report to the user that the inferior has stopped, and | |
1013 | do the necessary cleanups. */ | |
1014 | ||
1015 | struct execution_control_state async_ecss; | |
1016 | struct execution_control_state *async_ecs; | |
1017 | ||
1018 | void | |
fba45db2 | 1019 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1020 | { |
1021 | static struct cleanup *old_cleanups; | |
1022 | ||
c5aa993b | 1023 | async_ecs = &async_ecss; |
43ff13b4 JM |
1024 | |
1025 | if (!async_ecs->wait_some_more) | |
1026 | { | |
488f131b | 1027 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
c5aa993b | 1028 | &step_resume_breakpoint); |
43ff13b4 JM |
1029 | |
1030 | /* Fill in with reasonable starting values. */ | |
1031 | init_execution_control_state (async_ecs); | |
1032 | ||
43ff13b4 | 1033 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1034 | previous_inferior_ptid = inferior_ptid; |
43ff13b4 JM |
1035 | |
1036 | overlay_cache_invalid = 1; | |
1037 | ||
1038 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1039 | because they can be loaded from the target while in target_wait. |
1040 | This makes remote debugging a bit more efficient for those | |
1041 | targets that provide critical registers as part of their normal | |
1042 | status mechanism. */ | |
43ff13b4 JM |
1043 | |
1044 | registers_changed (); | |
1045 | } | |
1046 | ||
9a4105ab | 1047 | if (deprecated_target_wait_hook) |
488f131b | 1048 | async_ecs->ptid = |
9a4105ab | 1049 | deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 | 1050 | else |
39f77062 | 1051 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 JM |
1052 | |
1053 | /* Now figure out what to do with the result of the result. */ | |
1054 | handle_inferior_event (async_ecs); | |
1055 | ||
1056 | if (!async_ecs->wait_some_more) | |
1057 | { | |
adf40b2e | 1058 | /* Do only the cleanups that have been added by this |
488f131b JB |
1059 | function. Let the continuations for the commands do the rest, |
1060 | if there are any. */ | |
43ff13b4 JM |
1061 | do_exec_cleanups (old_cleanups); |
1062 | normal_stop (); | |
c2d11a7d JM |
1063 | if (step_multi && stop_step) |
1064 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1065 | else | |
1066 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1067 | } |
1068 | } | |
1069 | ||
cd0fc7c3 SS |
1070 | /* Prepare an execution control state for looping through a |
1071 | wait_for_inferior-type loop. */ | |
1072 | ||
1073 | void | |
96baa820 | 1074 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1075 | { |
c2d11a7d | 1076 | /* ecs->another_trap? */ |
cd0fc7c3 SS |
1077 | ecs->random_signal = 0; |
1078 | ecs->remove_breakpoints_on_following_step = 0; | |
1079 | ecs->handling_longjmp = 0; /* FIXME */ | |
cd0fc7c3 SS |
1080 | ecs->stepping_through_solib_after_catch = 0; |
1081 | ecs->stepping_through_solib_catchpoints = NULL; | |
1082 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1083 | ecs->stepping_through_sigtramp = 0; | |
1084 | ecs->sal = find_pc_line (prev_pc, 0); | |
1085 | ecs->current_line = ecs->sal.line; | |
1086 | ecs->current_symtab = ecs->sal.symtab; | |
1087 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1088 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1089 | ecs->wp = &(ecs->ws); |
1090 | } | |
1091 | ||
a0b3c4fd | 1092 | /* Call this function before setting step_resume_breakpoint, as a |
53a5351d JM |
1093 | sanity check. There should never be more than one step-resume |
1094 | breakpoint per thread, so we should never be setting a new | |
1095 | step_resume_breakpoint when one is already active. */ | |
a0b3c4fd | 1096 | static void |
96baa820 | 1097 | check_for_old_step_resume_breakpoint (void) |
a0b3c4fd JM |
1098 | { |
1099 | if (step_resume_breakpoint) | |
488f131b JB |
1100 | warning |
1101 | ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint"); | |
a0b3c4fd JM |
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 | ||
dd80620e MS |
1116 | /* Switch thread contexts, maintaining "infrun state". */ |
1117 | ||
1118 | static void | |
1119 | context_switch (struct execution_control_state *ecs) | |
1120 | { | |
1121 | /* Caution: it may happen that the new thread (or the old one!) | |
1122 | is not in the thread list. In this case we must not attempt | |
1123 | to "switch context", or we run the risk that our context may | |
1124 | be lost. This may happen as a result of the target module | |
1125 | mishandling thread creation. */ | |
1126 | ||
1127 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) | |
488f131b | 1128 | { /* Perform infrun state context switch: */ |
dd80620e | 1129 | /* Save infrun state for the old thread. */ |
0ce3d317 | 1130 | save_infrun_state (inferior_ptid, prev_pc, |
dd80620e | 1131 | trap_expected, step_resume_breakpoint, |
15960608 | 1132 | step_range_start, |
aa0cd9c1 | 1133 | step_range_end, &step_frame_id, |
dd80620e MS |
1134 | ecs->handling_longjmp, ecs->another_trap, |
1135 | ecs->stepping_through_solib_after_catch, | |
1136 | ecs->stepping_through_solib_catchpoints, | |
1137 | ecs->stepping_through_sigtramp, | |
f2c9ca08 | 1138 | ecs->current_line, ecs->current_symtab); |
dd80620e MS |
1139 | |
1140 | /* Load infrun state for the new thread. */ | |
0ce3d317 | 1141 | load_infrun_state (ecs->ptid, &prev_pc, |
dd80620e | 1142 | &trap_expected, &step_resume_breakpoint, |
15960608 | 1143 | &step_range_start, |
aa0cd9c1 | 1144 | &step_range_end, &step_frame_id, |
dd80620e MS |
1145 | &ecs->handling_longjmp, &ecs->another_trap, |
1146 | &ecs->stepping_through_solib_after_catch, | |
1147 | &ecs->stepping_through_solib_catchpoints, | |
488f131b | 1148 | &ecs->stepping_through_sigtramp, |
f2c9ca08 | 1149 | &ecs->current_line, &ecs->current_symtab); |
dd80620e MS |
1150 | } |
1151 | inferior_ptid = ecs->ptid; | |
1152 | } | |
1153 | ||
4fa8626c DJ |
1154 | static void |
1155 | adjust_pc_after_break (struct execution_control_state *ecs) | |
1156 | { | |
8aad930b | 1157 | CORE_ADDR breakpoint_pc; |
4fa8626c DJ |
1158 | |
1159 | /* If this target does not decrement the PC after breakpoints, then | |
1160 | we have nothing to do. */ | |
1161 | if (DECR_PC_AFTER_BREAK == 0) | |
1162 | return; | |
1163 | ||
1164 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If | |
1165 | we aren't, just return. | |
9709f61c DJ |
1166 | |
1167 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
1168 | affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented | |
1169 | by software breakpoints should be handled through the normal breakpoint | |
1170 | layer. | |
4fa8626c DJ |
1171 | |
1172 | NOTE drow/2004-01-31: On some targets, breakpoints may generate | |
1173 | different signals (SIGILL or SIGEMT for instance), but it is less | |
1174 | clear where the PC is pointing afterwards. It may not match | |
1175 | DECR_PC_AFTER_BREAK. I don't know any specific target that generates | |
1176 | these signals at breakpoints (the code has been in GDB since at least | |
1177 | 1992) so I can not guess how to handle them here. | |
1178 | ||
1179 | In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS | |
1180 | would have the PC after hitting a watchpoint affected by | |
1181 | DECR_PC_AFTER_BREAK. I haven't found any target with both of these set | |
1182 | in GDB history, and it seems unlikely to be correct, so | |
1183 | HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */ | |
1184 | ||
1185 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
1186 | return; | |
1187 | ||
1188 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
1189 | return; | |
1190 | ||
8aad930b AC |
1191 | /* Find the location where (if we've hit a breakpoint) the |
1192 | breakpoint would be. */ | |
1193 | breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK; | |
1194 | ||
1195 | if (SOFTWARE_SINGLE_STEP_P ()) | |
1196 | { | |
1197 | /* When using software single-step, a SIGTRAP can only indicate | |
1198 | an inserted breakpoint. This actually makes things | |
1199 | easier. */ | |
1200 | if (singlestep_breakpoints_inserted_p) | |
1201 | /* When software single stepping, the instruction at [prev_pc] | |
1202 | is never a breakpoint, but the instruction following | |
1203 | [prev_pc] (in program execution order) always is. Assume | |
1204 | that following instruction was reached and hence a software | |
1205 | breakpoint was hit. */ | |
1206 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1207 | else if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1208 | /* The inferior was free running (i.e., no single-step | |
1209 | breakpoints inserted) and it hit a software breakpoint. */ | |
1210 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1211 | } | |
1212 | else | |
1213 | { | |
1214 | /* When using hardware single-step, a SIGTRAP is reported for | |
1215 | both a completed single-step and a software breakpoint. Need | |
1216 | to differentiate between the two as the latter needs | |
1217 | adjusting but the former does not. */ | |
1218 | if (currently_stepping (ecs)) | |
1219 | { | |
1220 | if (prev_pc == breakpoint_pc | |
1221 | && software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1222 | /* Hardware single-stepped a software breakpoint (as | |
1223 | occures when the inferior is resumed with PC pointing | |
1224 | at not-yet-hit software breakpoint). Since the | |
1225 | breakpoint really is executed, the inferior needs to be | |
1226 | backed up to the breakpoint address. */ | |
1227 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1228 | } | |
1229 | else | |
1230 | { | |
1231 | if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1232 | /* The inferior was free running (i.e., no hardware | |
1233 | single-step and no possibility of a false SIGTRAP) and | |
1234 | hit a software breakpoint. */ | |
1235 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1236 | } | |
1237 | } | |
4fa8626c DJ |
1238 | } |
1239 | ||
cd0fc7c3 SS |
1240 | /* Given an execution control state that has been freshly filled in |
1241 | by an event from the inferior, figure out what it means and take | |
1242 | appropriate action. */ | |
c906108c | 1243 | |
7270d8f2 OF |
1244 | int stepped_after_stopped_by_watchpoint; |
1245 | ||
cd0fc7c3 | 1246 | void |
96baa820 | 1247 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 1248 | { |
65e82032 AC |
1249 | /* NOTE: cagney/2003-03-28: If you're looking at this code and |
1250 | thinking that the variable stepped_after_stopped_by_watchpoint | |
1251 | isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT, | |
1252 | defined in the file "config/pa/nm-hppah.h", accesses the variable | |
1253 | indirectly. Mutter something rude about the HP merge. */ | |
c8edd8b4 | 1254 | int sw_single_step_trap_p = 0; |
46587c42 | 1255 | int stopped_by_watchpoint = -1; /* Mark as unknown. */ |
cd0fc7c3 | 1256 | |
e02bc4cc | 1257 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1258 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1259 | target_last_waitstatus = *ecs->wp; |
1260 | ||
4fa8626c DJ |
1261 | adjust_pc_after_break (ecs); |
1262 | ||
488f131b JB |
1263 | switch (ecs->infwait_state) |
1264 | { | |
1265 | case infwait_thread_hop_state: | |
1266 | /* Cancel the waiton_ptid. */ | |
1267 | ecs->waiton_ptid = pid_to_ptid (-1); | |
65e82032 AC |
1268 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event |
1269 | is serviced in this loop, below. */ | |
1270 | if (ecs->enable_hw_watchpoints_after_wait) | |
1271 | { | |
1272 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1273 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1274 | } | |
1275 | stepped_after_stopped_by_watchpoint = 0; | |
1276 | break; | |
b83266a0 | 1277 | |
488f131b JB |
1278 | case infwait_normal_state: |
1279 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event | |
1280 | is serviced in this loop, below. */ | |
1281 | if (ecs->enable_hw_watchpoints_after_wait) | |
1282 | { | |
1283 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1284 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1285 | } | |
1286 | stepped_after_stopped_by_watchpoint = 0; | |
1287 | break; | |
b83266a0 | 1288 | |
488f131b | 1289 | case infwait_nullified_state: |
65e82032 | 1290 | stepped_after_stopped_by_watchpoint = 0; |
488f131b | 1291 | break; |
b83266a0 | 1292 | |
488f131b JB |
1293 | case infwait_nonstep_watch_state: |
1294 | insert_breakpoints (); | |
c906108c | 1295 | |
488f131b JB |
1296 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1297 | handle things like signals arriving and other things happening | |
1298 | in combination correctly? */ | |
1299 | stepped_after_stopped_by_watchpoint = 1; | |
1300 | break; | |
65e82032 AC |
1301 | |
1302 | default: | |
1303 | internal_error (__FILE__, __LINE__, "bad switch"); | |
488f131b JB |
1304 | } |
1305 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1306 | |
488f131b | 1307 | flush_cached_frames (); |
c906108c | 1308 | |
488f131b | 1309 | /* If it's a new process, add it to the thread database */ |
c906108c | 1310 | |
488f131b | 1311 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
b9b5d7ea | 1312 | && !ptid_equal (ecs->ptid, minus_one_ptid) |
488f131b JB |
1313 | && !in_thread_list (ecs->ptid)); |
1314 | ||
1315 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1316 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1317 | { | |
1318 | add_thread (ecs->ptid); | |
c906108c | 1319 | |
488f131b JB |
1320 | ui_out_text (uiout, "[New "); |
1321 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); | |
1322 | ui_out_text (uiout, "]\n"); | |
c906108c SS |
1323 | |
1324 | #if 0 | |
488f131b JB |
1325 | /* NOTE: This block is ONLY meant to be invoked in case of a |
1326 | "thread creation event"! If it is invoked for any other | |
1327 | sort of event (such as a new thread landing on a breakpoint), | |
1328 | the event will be discarded, which is almost certainly | |
1329 | a bad thing! | |
1330 | ||
1331 | To avoid this, the low-level module (eg. target_wait) | |
1332 | should call in_thread_list and add_thread, so that the | |
1333 | new thread is known by the time we get here. */ | |
1334 | ||
1335 | /* We may want to consider not doing a resume here in order | |
1336 | to give the user a chance to play with the new thread. | |
1337 | It might be good to make that a user-settable option. */ | |
1338 | ||
1339 | /* At this point, all threads are stopped (happens | |
1340 | automatically in either the OS or the native code). | |
1341 | Therefore we need to continue all threads in order to | |
1342 | make progress. */ | |
1343 | ||
1344 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1345 | prepare_to_wait (ecs); | |
1346 | return; | |
c906108c | 1347 | #endif |
488f131b | 1348 | } |
c906108c | 1349 | |
488f131b JB |
1350 | switch (ecs->ws.kind) |
1351 | { | |
1352 | case TARGET_WAITKIND_LOADED: | |
1353 | /* Ignore gracefully during startup of the inferior, as it | |
1354 | might be the shell which has just loaded some objects, | |
1355 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1356 | #ifdef SOLIB_ADD |
c0236d92 | 1357 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b JB |
1358 | { |
1359 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1360 | breakpoint addresses via breakpoint_re_set. */ | |
1361 | if (breakpoints_inserted) | |
1362 | remove_breakpoints (); | |
c906108c | 1363 | |
488f131b JB |
1364 | /* Check for any newly added shared libraries if we're |
1365 | supposed to be adding them automatically. Switch | |
1366 | terminal for any messages produced by | |
1367 | breakpoint_re_set. */ | |
1368 | target_terminal_ours_for_output (); | |
aff6338a AC |
1369 | /* NOTE: cagney/2003-11-25: Make certain that the target |
1370 | stack's section table is kept up-to-date. Architectures, | |
1371 | (e.g., PPC64), use the section table to perform | |
1372 | operations such as address => section name and hence | |
1373 | require the table to contain all sections (including | |
1374 | those found in shared libraries). */ | |
1375 | /* NOTE: cagney/2003-11-25: Pass current_target and not | |
1376 | exec_ops to SOLIB_ADD. This is because current GDB is | |
1377 | only tooled to propagate section_table changes out from | |
1378 | the "current_target" (see target_resize_to_sections), and | |
1379 | not up from the exec stratum. This, of course, isn't | |
1380 | right. "infrun.c" should only interact with the | |
1381 | exec/process stratum, instead relying on the target stack | |
1382 | to propagate relevant changes (stop, section table | |
1383 | changed, ...) up to other layers. */ | |
1384 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); | |
488f131b JB |
1385 | target_terminal_inferior (); |
1386 | ||
1387 | /* Reinsert breakpoints and continue. */ | |
1388 | if (breakpoints_inserted) | |
1389 | insert_breakpoints (); | |
1390 | } | |
c906108c | 1391 | #endif |
488f131b JB |
1392 | resume (0, TARGET_SIGNAL_0); |
1393 | prepare_to_wait (ecs); | |
1394 | return; | |
c5aa993b | 1395 | |
488f131b JB |
1396 | case TARGET_WAITKIND_SPURIOUS: |
1397 | resume (0, TARGET_SIGNAL_0); | |
1398 | prepare_to_wait (ecs); | |
1399 | return; | |
c5aa993b | 1400 | |
488f131b JB |
1401 | case TARGET_WAITKIND_EXITED: |
1402 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
1403 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
1404 | ||
1405 | /* Record the exit code in the convenience variable $_exitcode, so | |
1406 | that the user can inspect this again later. */ | |
1407 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1408 | value_from_longest (builtin_type_int, | |
1409 | (LONGEST) ecs->ws.value.integer)); | |
1410 | gdb_flush (gdb_stdout); | |
1411 | target_mourn_inferior (); | |
1412 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1413 | stop_print_frame = 0; | |
1414 | stop_stepping (ecs); | |
1415 | return; | |
c5aa993b | 1416 | |
488f131b JB |
1417 | case TARGET_WAITKIND_SIGNALLED: |
1418 | stop_print_frame = 0; | |
1419 | stop_signal = ecs->ws.value.sig; | |
1420 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1421 | |
488f131b JB |
1422 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1423 | reach here unless the inferior is dead. However, for years | |
1424 | target_kill() was called here, which hints that fatal signals aren't | |
1425 | really fatal on some systems. If that's true, then some changes | |
1426 | may be needed. */ | |
1427 | target_mourn_inferior (); | |
c906108c | 1428 | |
488f131b JB |
1429 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
1430 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1431 | stop_stepping (ecs); | |
1432 | return; | |
c906108c | 1433 | |
488f131b JB |
1434 | /* The following are the only cases in which we keep going; |
1435 | the above cases end in a continue or goto. */ | |
1436 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 1437 | case TARGET_WAITKIND_VFORKED: |
488f131b JB |
1438 | stop_signal = TARGET_SIGNAL_TRAP; |
1439 | pending_follow.kind = ecs->ws.kind; | |
1440 | ||
8e7d2c16 DJ |
1441 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
1442 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c | 1443 | |
488f131b | 1444 | stop_pc = read_pc (); |
675bf4cb | 1445 | |
00d4360e | 1446 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1447 | |
488f131b | 1448 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
04e68871 DJ |
1449 | |
1450 | /* If no catchpoint triggered for this, then keep going. */ | |
1451 | if (ecs->random_signal) | |
1452 | { | |
1453 | stop_signal = TARGET_SIGNAL_0; | |
1454 | keep_going (ecs); | |
1455 | return; | |
1456 | } | |
488f131b JB |
1457 | goto process_event_stop_test; |
1458 | ||
1459 | case TARGET_WAITKIND_EXECD: | |
1460 | stop_signal = TARGET_SIGNAL_TRAP; | |
1461 | ||
7d2830a3 DJ |
1462 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
1463 | target_wait function. Until then following vfork on HP/UX 10.20 | |
1464 | is probably broken by this. Of course, it's broken anyway. */ | |
488f131b JB |
1465 | /* Is this a target which reports multiple exec events per actual |
1466 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1467 | ignore all but the last one. Just resume the exec'r, and wait | |
1468 | for the next exec event. */ | |
1469 | if (inferior_ignoring_leading_exec_events) | |
1470 | { | |
1471 | inferior_ignoring_leading_exec_events--; | |
1472 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1473 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event. | |
1474 | parent_pid); | |
1475 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); | |
1476 | prepare_to_wait (ecs); | |
1477 | return; | |
1478 | } | |
1479 | inferior_ignoring_leading_exec_events = | |
1480 | target_reported_exec_events_per_exec_call () - 1; | |
1481 | ||
1482 | pending_follow.execd_pathname = | |
1483 | savestring (ecs->ws.value.execd_pathname, | |
1484 | strlen (ecs->ws.value.execd_pathname)); | |
1485 | ||
488f131b JB |
1486 | /* This causes the eventpoints and symbol table to be reset. Must |
1487 | do this now, before trying to determine whether to stop. */ | |
1488 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); | |
1489 | xfree (pending_follow.execd_pathname); | |
c906108c | 1490 | |
488f131b JB |
1491 | stop_pc = read_pc_pid (ecs->ptid); |
1492 | ecs->saved_inferior_ptid = inferior_ptid; | |
1493 | inferior_ptid = ecs->ptid; | |
675bf4cb | 1494 | |
00d4360e | 1495 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1496 | |
488f131b JB |
1497 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1498 | inferior_ptid = ecs->saved_inferior_ptid; | |
04e68871 DJ |
1499 | |
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 | ||
1509 | /* These syscall events are returned on HP-UX, as part of its | |
1510 | implementation of page-protection-based "hardware" watchpoints. | |
1511 | HP-UX has unfortunate interactions between page-protections and | |
1512 | some system calls. Our solution is to disable hardware watches | |
1513 | when a system call is entered, and reenable them when the syscall | |
1514 | completes. The downside of this is that we may miss the precise | |
1515 | point at which a watched piece of memory is modified. "Oh well." | |
1516 | ||
1517 | Note that we may have multiple threads running, which may each | |
1518 | enter syscalls at roughly the same time. Since we don't have a | |
1519 | good notion currently of whether a watched piece of memory is | |
1520 | thread-private, we'd best not have any page-protections active | |
1521 | when any thread is in a syscall. Thus, we only want to reenable | |
1522 | hardware watches when no threads are in a syscall. | |
1523 | ||
1524 | Also, be careful not to try to gather much state about a thread | |
1525 | that's in a syscall. It's frequently a losing proposition. */ | |
1526 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
1527 | number_of_threads_in_syscalls++; | |
1528 | if (number_of_threads_in_syscalls == 1) | |
1529 | { | |
1530 | TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1531 | } | |
1532 | resume (0, TARGET_SIGNAL_0); | |
1533 | prepare_to_wait (ecs); | |
1534 | return; | |
c906108c | 1535 | |
488f131b JB |
1536 | /* Before examining the threads further, step this thread to |
1537 | get it entirely out of the syscall. (We get notice of the | |
1538 | event when the thread is just on the verge of exiting a | |
1539 | syscall. Stepping one instruction seems to get it back | |
1540 | into user code.) | |
c906108c | 1541 | |
488f131b JB |
1542 | Note that although the logical place to reenable h/w watches |
1543 | is here, we cannot. We cannot reenable them before stepping | |
1544 | the thread (this causes the next wait on the thread to hang). | |
c4093a6a | 1545 | |
488f131b JB |
1546 | Nor can we enable them after stepping until we've done a wait. |
1547 | Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait | |
1548 | here, which will be serviced immediately after the target | |
1549 | is waited on. */ | |
1550 | case TARGET_WAITKIND_SYSCALL_RETURN: | |
1551 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); | |
1552 | ||
1553 | if (number_of_threads_in_syscalls > 0) | |
1554 | { | |
1555 | number_of_threads_in_syscalls--; | |
1556 | ecs->enable_hw_watchpoints_after_wait = | |
1557 | (number_of_threads_in_syscalls == 0); | |
1558 | } | |
1559 | prepare_to_wait (ecs); | |
1560 | return; | |
c906108c | 1561 | |
488f131b JB |
1562 | case TARGET_WAITKIND_STOPPED: |
1563 | stop_signal = ecs->ws.value.sig; | |
1564 | break; | |
c906108c | 1565 | |
488f131b JB |
1566 | /* We had an event in the inferior, but we are not interested |
1567 | in handling it at this level. The lower layers have already | |
8e7d2c16 DJ |
1568 | done what needs to be done, if anything. |
1569 | ||
1570 | One of the possible circumstances for this is when the | |
1571 | inferior produces output for the console. The inferior has | |
1572 | not stopped, and we are ignoring the event. Another possible | |
1573 | circumstance is any event which the lower level knows will be | |
1574 | reported multiple times without an intervening resume. */ | |
488f131b | 1575 | case TARGET_WAITKIND_IGNORE: |
8e7d2c16 | 1576 | prepare_to_wait (ecs); |
488f131b JB |
1577 | return; |
1578 | } | |
c906108c | 1579 | |
488f131b JB |
1580 | /* We may want to consider not doing a resume here in order to give |
1581 | the user a chance to play with the new thread. It might be good | |
1582 | to make that a user-settable option. */ | |
c906108c | 1583 | |
488f131b JB |
1584 | /* At this point, all threads are stopped (happens automatically in |
1585 | either the OS or the native code). Therefore we need to continue | |
1586 | all threads in order to make progress. */ | |
1587 | if (ecs->new_thread_event) | |
1588 | { | |
1589 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1590 | prepare_to_wait (ecs); | |
1591 | return; | |
1592 | } | |
c906108c | 1593 | |
488f131b JB |
1594 | stop_pc = read_pc_pid (ecs->ptid); |
1595 | ||
9f976b41 DJ |
1596 | if (stepping_past_singlestep_breakpoint) |
1597 | { | |
1598 | gdb_assert (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p); | |
1599 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); | |
1600 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
1601 | ||
1602 | stepping_past_singlestep_breakpoint = 0; | |
1603 | ||
1604 | /* We've either finished single-stepping past the single-step | |
1605 | breakpoint, or stopped for some other reason. It would be nice if | |
1606 | we could tell, but we can't reliably. */ | |
1607 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1608 | { | |
1609 | /* Pull the single step breakpoints out of the target. */ | |
1610 | SOFTWARE_SINGLE_STEP (0, 0); | |
1611 | singlestep_breakpoints_inserted_p = 0; | |
1612 | ||
1613 | ecs->random_signal = 0; | |
1614 | ||
1615 | ecs->ptid = saved_singlestep_ptid; | |
1616 | context_switch (ecs); | |
9a4105ab AC |
1617 | if (deprecated_context_hook) |
1618 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
1619 | |
1620 | resume (1, TARGET_SIGNAL_0); | |
1621 | prepare_to_wait (ecs); | |
1622 | return; | |
1623 | } | |
1624 | } | |
1625 | ||
1626 | stepping_past_singlestep_breakpoint = 0; | |
1627 | ||
488f131b JB |
1628 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1629 | another thread. If so, then step that thread past the breakpoint, | |
1630 | and continue it. */ | |
1631 | ||
1632 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1633 | { | |
9f976b41 DJ |
1634 | int thread_hop_needed = 0; |
1635 | ||
f8d40ec8 JB |
1636 | /* Check if a regular breakpoint has been hit before checking |
1637 | for a potential single step breakpoint. Otherwise, GDB will | |
1638 | not see this breakpoint hit when stepping onto breakpoints. */ | |
4fa8626c | 1639 | if (breakpoints_inserted && breakpoint_here_p (stop_pc)) |
488f131b | 1640 | { |
c5aa993b | 1641 | ecs->random_signal = 0; |
4fa8626c | 1642 | if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
9f976b41 DJ |
1643 | thread_hop_needed = 1; |
1644 | } | |
1645 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
1646 | { | |
1647 | ecs->random_signal = 0; | |
1648 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
1649 | change when we go from single-threaded to multi-threaded. If | |
1650 | the singlestep_ptid is still in the list, assume that it is | |
1651 | really different from ecs->ptid. */ | |
1652 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
1653 | && in_thread_list (singlestep_ptid)) | |
1654 | { | |
1655 | thread_hop_needed = 1; | |
1656 | stepping_past_singlestep_breakpoint = 1; | |
1657 | saved_singlestep_ptid = singlestep_ptid; | |
1658 | } | |
1659 | } | |
1660 | ||
1661 | if (thread_hop_needed) | |
488f131b JB |
1662 | { |
1663 | int remove_status; | |
1664 | ||
1665 | /* Saw a breakpoint, but it was hit by the wrong thread. | |
1666 | Just continue. */ | |
488f131b | 1667 | |
9f976b41 DJ |
1668 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1669 | { | |
1670 | /* Pull the single step breakpoints out of the target. */ | |
1671 | SOFTWARE_SINGLE_STEP (0, 0); | |
1672 | singlestep_breakpoints_inserted_p = 0; | |
1673 | } | |
1674 | ||
488f131b JB |
1675 | remove_status = remove_breakpoints (); |
1676 | /* Did we fail to remove breakpoints? If so, try | |
1677 | to set the PC past the bp. (There's at least | |
1678 | one situation in which we can fail to remove | |
1679 | the bp's: On HP-UX's that use ttrace, we can't | |
1680 | change the address space of a vforking child | |
1681 | process until the child exits (well, okay, not | |
1682 | then either :-) or execs. */ | |
1683 | if (remove_status != 0) | |
1684 | { | |
1685 | /* FIXME! This is obviously non-portable! */ | |
4fa8626c | 1686 | write_pc_pid (stop_pc + 4, ecs->ptid); |
488f131b JB |
1687 | /* We need to restart all the threads now, |
1688 | * unles we're running in scheduler-locked mode. | |
1689 | * Use currently_stepping to determine whether to | |
1690 | * step or continue. | |
1691 | */ | |
1692 | /* FIXME MVS: is there any reason not to call resume()? */ | |
1693 | if (scheduler_mode == schedlock_on) | |
1694 | target_resume (ecs->ptid, | |
1695 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1696 | else | |
1697 | target_resume (RESUME_ALL, | |
1698 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1699 | prepare_to_wait (ecs); | |
1700 | return; | |
1701 | } | |
1702 | else | |
1703 | { /* Single step */ | |
1704 | breakpoints_inserted = 0; | |
1705 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
1706 | context_switch (ecs); | |
1707 | ecs->waiton_ptid = ecs->ptid; | |
1708 | ecs->wp = &(ecs->ws); | |
1709 | ecs->another_trap = 1; | |
1710 | ||
1711 | ecs->infwait_state = infwait_thread_hop_state; | |
1712 | keep_going (ecs); | |
1713 | registers_changed (); | |
1714 | return; | |
1715 | } | |
488f131b | 1716 | } |
f8d40ec8 JB |
1717 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1718 | { | |
c8edd8b4 | 1719 | sw_single_step_trap_p = 1; |
f8d40ec8 JB |
1720 | ecs->random_signal = 0; |
1721 | } | |
488f131b JB |
1722 | } |
1723 | else | |
1724 | ecs->random_signal = 1; | |
c906108c | 1725 | |
488f131b | 1726 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
1727 | so, then switch to that thread. */ |
1728 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 1729 | { |
488f131b | 1730 | context_switch (ecs); |
c5aa993b | 1731 | |
9a4105ab AC |
1732 | if (deprecated_context_hook) |
1733 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
c5aa993b | 1734 | |
488f131b JB |
1735 | flush_cached_frames (); |
1736 | } | |
c906108c | 1737 | |
488f131b JB |
1738 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1739 | { | |
1740 | /* Pull the single step breakpoints out of the target. */ | |
1741 | SOFTWARE_SINGLE_STEP (0, 0); | |
1742 | singlestep_breakpoints_inserted_p = 0; | |
1743 | } | |
c906108c | 1744 | |
488f131b JB |
1745 | /* If PC is pointing at a nullified instruction, then step beyond |
1746 | it so that the user won't be confused when GDB appears to be ready | |
1747 | to execute it. */ | |
c906108c | 1748 | |
488f131b JB |
1749 | /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */ |
1750 | if (INSTRUCTION_NULLIFIED) | |
1751 | { | |
1752 | registers_changed (); | |
1753 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); | |
c906108c | 1754 | |
488f131b JB |
1755 | /* We may have received a signal that we want to pass to |
1756 | the inferior; therefore, we must not clobber the waitstatus | |
1757 | in WS. */ | |
c906108c | 1758 | |
488f131b JB |
1759 | ecs->infwait_state = infwait_nullified_state; |
1760 | ecs->waiton_ptid = ecs->ptid; | |
1761 | ecs->wp = &(ecs->tmpstatus); | |
1762 | prepare_to_wait (ecs); | |
1763 | return; | |
1764 | } | |
c906108c | 1765 | |
488f131b JB |
1766 | /* It may not be necessary to disable the watchpoint to stop over |
1767 | it. For example, the PA can (with some kernel cooperation) | |
1768 | single step over a watchpoint without disabling the watchpoint. */ | |
1769 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1770 | { | |
1771 | resume (1, 0); | |
1772 | prepare_to_wait (ecs); | |
1773 | return; | |
1774 | } | |
c906108c | 1775 | |
488f131b JB |
1776 | /* It is far more common to need to disable a watchpoint to step |
1777 | the inferior over it. FIXME. What else might a debug | |
1778 | register or page protection watchpoint scheme need here? */ | |
1779 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1780 | { | |
1781 | /* At this point, we are stopped at an instruction which has | |
1782 | attempted to write to a piece of memory under control of | |
1783 | a watchpoint. The instruction hasn't actually executed | |
1784 | yet. If we were to evaluate the watchpoint expression | |
1785 | now, we would get the old value, and therefore no change | |
1786 | would seem to have occurred. | |
1787 | ||
1788 | In order to make watchpoints work `right', we really need | |
1789 | to complete the memory write, and then evaluate the | |
1790 | watchpoint expression. The following code does that by | |
1791 | removing the watchpoint (actually, all watchpoints and | |
1792 | breakpoints), single-stepping the target, re-inserting | |
1793 | watchpoints, and then falling through to let normal | |
1794 | single-step processing handle proceed. Since this | |
1795 | includes evaluating watchpoints, things will come to a | |
1796 | stop in the correct manner. */ | |
1797 | ||
488f131b JB |
1798 | remove_breakpoints (); |
1799 | registers_changed (); | |
1800 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
c5aa993b | 1801 | |
488f131b JB |
1802 | ecs->waiton_ptid = ecs->ptid; |
1803 | ecs->wp = &(ecs->ws); | |
1804 | ecs->infwait_state = infwait_nonstep_watch_state; | |
1805 | prepare_to_wait (ecs); | |
1806 | return; | |
1807 | } | |
1808 | ||
1809 | /* It may be possible to simply continue after a watchpoint. */ | |
1810 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
00d4360e | 1811 | stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws); |
488f131b JB |
1812 | |
1813 | ecs->stop_func_start = 0; | |
1814 | ecs->stop_func_end = 0; | |
1815 | ecs->stop_func_name = 0; | |
1816 | /* Don't care about return value; stop_func_start and stop_func_name | |
1817 | will both be 0 if it doesn't work. */ | |
1818 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
1819 | &ecs->stop_func_start, &ecs->stop_func_end); | |
782263ab | 1820 | ecs->stop_func_start += DEPRECATED_FUNCTION_START_OFFSET; |
488f131b JB |
1821 | ecs->another_trap = 0; |
1822 | bpstat_clear (&stop_bpstat); | |
1823 | stop_step = 0; | |
1824 | stop_stack_dummy = 0; | |
1825 | stop_print_frame = 1; | |
1826 | ecs->random_signal = 0; | |
1827 | stopped_by_random_signal = 0; | |
1828 | breakpoints_failed = 0; | |
1829 | ||
1830 | /* Look at the cause of the stop, and decide what to do. | |
1831 | The alternatives are: | |
1832 | 1) break; to really stop and return to the debugger, | |
1833 | 2) drop through to start up again | |
1834 | (set ecs->another_trap to 1 to single step once) | |
1835 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
1836 | will be made according to the signal handling tables. */ | |
1837 | ||
1838 | /* First, distinguish signals caused by the debugger from signals | |
03cebad2 MK |
1839 | that have to do with the program's own actions. Note that |
1840 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
1841 | on the operating system version. Here we detect when a SIGILL or | |
1842 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
1843 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
1844 | when we're trying to execute a breakpoint instruction on a | |
1845 | non-executable stack. This happens for call dummy breakpoints | |
1846 | for architectures like SPARC that place call dummies on the | |
1847 | stack. */ | |
488f131b JB |
1848 | |
1849 | if (stop_signal == TARGET_SIGNAL_TRAP | |
1850 | || (breakpoints_inserted && | |
1851 | (stop_signal == TARGET_SIGNAL_ILL | |
03cebad2 | 1852 | || stop_signal == TARGET_SIGNAL_SEGV |
c54cfec8 | 1853 | || stop_signal == TARGET_SIGNAL_EMT)) |
c0236d92 EZ |
1854 | || stop_soon == STOP_QUIETLY |
1855 | || stop_soon == STOP_QUIETLY_NO_SIGSTOP) | |
488f131b JB |
1856 | { |
1857 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1858 | { | |
1859 | stop_print_frame = 0; | |
1860 | stop_stepping (ecs); | |
1861 | return; | |
1862 | } | |
c54cfec8 EZ |
1863 | |
1864 | /* This is originated from start_remote(), start_inferior() and | |
1865 | shared libraries hook functions. */ | |
c0236d92 | 1866 | if (stop_soon == STOP_QUIETLY) |
488f131b JB |
1867 | { |
1868 | stop_stepping (ecs); | |
1869 | return; | |
1870 | } | |
1871 | ||
c54cfec8 EZ |
1872 | /* This originates from attach_command(). We need to overwrite |
1873 | the stop_signal here, because some kernels don't ignore a | |
1874 | SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call. | |
1875 | See more comments in inferior.h. */ | |
c0236d92 | 1876 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
c54cfec8 EZ |
1877 | { |
1878 | stop_stepping (ecs); | |
1879 | if (stop_signal == TARGET_SIGNAL_STOP) | |
1880 | stop_signal = TARGET_SIGNAL_0; | |
1881 | return; | |
1882 | } | |
1883 | ||
d303a6c7 AC |
1884 | /* Don't even think about breakpoints if just proceeded over a |
1885 | breakpoint. */ | |
1886 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected) | |
488f131b JB |
1887 | bpstat_clear (&stop_bpstat); |
1888 | else | |
1889 | { | |
1890 | /* See if there is a breakpoint at the current PC. */ | |
00d4360e UW |
1891 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, |
1892 | stopped_by_watchpoint); | |
488f131b | 1893 | |
488f131b JB |
1894 | /* Following in case break condition called a |
1895 | function. */ | |
1896 | stop_print_frame = 1; | |
1897 | } | |
1898 | ||
73dd234f AC |
1899 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
1900 | at one stage in the past included checks for an inferior | |
1901 | function call's call dummy's return breakpoint. The original | |
1902 | comment, that went with the test, read: | |
1903 | ||
1904 | ``End of a stack dummy. Some systems (e.g. Sony news) give | |
1905 | another signal besides SIGTRAP, so check here as well as | |
1906 | above.'' | |
1907 | ||
1908 | If someone ever tries to get get call dummys on a | |
1909 | non-executable stack to work (where the target would stop | |
03cebad2 MK |
1910 | with something like a SIGSEGV), then those tests might need |
1911 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 1912 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
1913 | suspect that it won't be the case. |
1914 | ||
1915 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to | |
1916 | be necessary for call dummies on a non-executable stack on | |
1917 | SPARC. */ | |
73dd234f | 1918 | |
488f131b JB |
1919 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1920 | ecs->random_signal | |
1921 | = !(bpstat_explains_signal (stop_bpstat) | |
1922 | || trap_expected | |
488f131b | 1923 | || (step_range_end && step_resume_breakpoint == NULL)); |
488f131b JB |
1924 | else |
1925 | { | |
73dd234f | 1926 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
488f131b JB |
1927 | if (!ecs->random_signal) |
1928 | stop_signal = TARGET_SIGNAL_TRAP; | |
1929 | } | |
1930 | } | |
1931 | ||
1932 | /* When we reach this point, we've pretty much decided | |
1933 | that the reason for stopping must've been a random | |
1934 | (unexpected) signal. */ | |
1935 | ||
1936 | else | |
1937 | ecs->random_signal = 1; | |
488f131b | 1938 | |
04e68871 | 1939 | process_event_stop_test: |
488f131b JB |
1940 | /* For the program's own signals, act according to |
1941 | the signal handling tables. */ | |
1942 | ||
1943 | if (ecs->random_signal) | |
1944 | { | |
1945 | /* Signal not for debugging purposes. */ | |
1946 | int printed = 0; | |
1947 | ||
1948 | stopped_by_random_signal = 1; | |
1949 | ||
1950 | if (signal_print[stop_signal]) | |
1951 | { | |
1952 | printed = 1; | |
1953 | target_terminal_ours_for_output (); | |
1954 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
1955 | } | |
1956 | if (signal_stop[stop_signal]) | |
1957 | { | |
1958 | stop_stepping (ecs); | |
1959 | return; | |
1960 | } | |
1961 | /* If not going to stop, give terminal back | |
1962 | if we took it away. */ | |
1963 | else if (printed) | |
1964 | target_terminal_inferior (); | |
1965 | ||
1966 | /* Clear the signal if it should not be passed. */ | |
1967 | if (signal_program[stop_signal] == 0) | |
1968 | stop_signal = TARGET_SIGNAL_0; | |
1969 | ||
d303a6c7 AC |
1970 | if (step_range_end != 0 |
1971 | && stop_signal != TARGET_SIGNAL_0 | |
1972 | && stop_pc >= step_range_start && stop_pc < step_range_end | |
1973 | && frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id)) | |
1974 | { | |
1975 | /* The inferior is about to take a signal that will take it | |
1976 | out of the single step range. Set a breakpoint at the | |
1977 | current PC (which is presumably where the signal handler | |
1978 | will eventually return) and then allow the inferior to | |
1979 | run free. | |
1980 | ||
1981 | Note that this is only needed for a signal delivered | |
1982 | while in the single-step range. Nested signals aren't a | |
1983 | problem as they eventually all return. */ | |
1984 | insert_step_resume_breakpoint (get_current_frame (), ecs); | |
1985 | } | |
488f131b JB |
1986 | keep_going (ecs); |
1987 | return; | |
1988 | } | |
1989 | ||
1990 | /* Handle cases caused by hitting a breakpoint. */ | |
1991 | { | |
1992 | CORE_ADDR jmp_buf_pc; | |
1993 | struct bpstat_what what; | |
1994 | ||
1995 | what = bpstat_what (stop_bpstat); | |
1996 | ||
1997 | if (what.call_dummy) | |
1998 | { | |
1999 | stop_stack_dummy = 1; | |
c5aa993b | 2000 | } |
c906108c | 2001 | |
488f131b | 2002 | switch (what.main_action) |
c5aa993b | 2003 | { |
488f131b JB |
2004 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2005 | /* If we hit the breakpoint at longjmp, disable it for the | |
2006 | duration of this command. Then, install a temporary | |
2007 | breakpoint at the target of the jmp_buf. */ | |
2008 | disable_longjmp_breakpoint (); | |
2009 | remove_breakpoints (); | |
2010 | breakpoints_inserted = 0; | |
2011 | if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
c5aa993b | 2012 | { |
488f131b | 2013 | keep_going (ecs); |
104c1213 | 2014 | return; |
c5aa993b | 2015 | } |
488f131b JB |
2016 | |
2017 | /* Need to blow away step-resume breakpoint, as it | |
2018 | interferes with us */ | |
2019 | if (step_resume_breakpoint != NULL) | |
104c1213 | 2020 | { |
488f131b | 2021 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
104c1213 | 2022 | } |
c906108c | 2023 | |
488f131b JB |
2024 | #if 0 |
2025 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2026 | if (step_over_calls > 0) | |
2027 | set_longjmp_resume_breakpoint (jmp_buf_pc, get_current_frame ()); | |
c5aa993b | 2028 | else |
488f131b | 2029 | #endif /* 0 */ |
818dd999 | 2030 | set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
488f131b JB |
2031 | ecs->handling_longjmp = 1; /* FIXME */ |
2032 | keep_going (ecs); | |
2033 | return; | |
c906108c | 2034 | |
488f131b JB |
2035 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2036 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
2037 | remove_breakpoints (); | |
2038 | breakpoints_inserted = 0; | |
2039 | #if 0 | |
2040 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2041 | if (step_over_calls | |
aa0cd9c1 AC |
2042 | && (frame_id_inner (get_frame_id (get_current_frame ()), |
2043 | step_frame_id))) | |
c5aa993b | 2044 | { |
488f131b | 2045 | ecs->another_trap = 1; |
d4f3574e SS |
2046 | keep_going (ecs); |
2047 | return; | |
c5aa993b | 2048 | } |
488f131b JB |
2049 | #endif /* 0 */ |
2050 | disable_longjmp_breakpoint (); | |
2051 | ecs->handling_longjmp = 0; /* FIXME */ | |
2052 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2053 | break; | |
2054 | /* else fallthrough */ | |
2055 | ||
2056 | case BPSTAT_WHAT_SINGLE: | |
2057 | if (breakpoints_inserted) | |
c5aa993b | 2058 | { |
488f131b | 2059 | remove_breakpoints (); |
c5aa993b | 2060 | } |
488f131b JB |
2061 | breakpoints_inserted = 0; |
2062 | ecs->another_trap = 1; | |
2063 | /* Still need to check other stuff, at least the case | |
2064 | where we are stepping and step out of the right range. */ | |
2065 | break; | |
c906108c | 2066 | |
488f131b JB |
2067 | case BPSTAT_WHAT_STOP_NOISY: |
2068 | stop_print_frame = 1; | |
c906108c | 2069 | |
d303a6c7 AC |
2070 | /* We are about to nuke the step_resume_breakpointt via the |
2071 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2072 | |
488f131b JB |
2073 | stop_stepping (ecs); |
2074 | return; | |
c5aa993b | 2075 | |
488f131b JB |
2076 | case BPSTAT_WHAT_STOP_SILENT: |
2077 | stop_print_frame = 0; | |
c5aa993b | 2078 | |
d303a6c7 AC |
2079 | /* We are about to nuke the step_resume_breakpoin via the |
2080 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2081 | |
488f131b | 2082 | stop_stepping (ecs); |
e441088d | 2083 | return; |
c5aa993b | 2084 | |
488f131b JB |
2085 | case BPSTAT_WHAT_STEP_RESUME: |
2086 | /* This proably demands a more elegant solution, but, yeah | |
2087 | right... | |
c5aa993b | 2088 | |
488f131b JB |
2089 | This function's use of the simple variable |
2090 | step_resume_breakpoint doesn't seem to accomodate | |
2091 | simultaneously active step-resume bp's, although the | |
2092 | breakpoint list certainly can. | |
c5aa993b | 2093 | |
488f131b JB |
2094 | If we reach here and step_resume_breakpoint is already |
2095 | NULL, then apparently we have multiple active | |
2096 | step-resume bp's. We'll just delete the breakpoint we | |
2097 | stopped at, and carry on. | |
2098 | ||
2099 | Correction: what the code currently does is delete a | |
2100 | step-resume bp, but it makes no effort to ensure that | |
2101 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2102 | |
488f131b JB |
2103 | if (step_resume_breakpoint == NULL) |
2104 | { | |
2105 | step_resume_breakpoint = | |
2106 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2107 | } | |
2108 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
2109 | break; | |
2110 | ||
2111 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
488f131b JB |
2112 | /* If were waiting for a trap, hitting the step_resume_break |
2113 | doesn't count as getting it. */ | |
2114 | if (trap_expected) | |
2115 | ecs->another_trap = 1; | |
2116 | break; | |
2117 | ||
2118 | case BPSTAT_WHAT_CHECK_SHLIBS: | |
2119 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2120 | #ifdef SOLIB_ADD | |
c906108c | 2121 | { |
488f131b JB |
2122 | /* Remove breakpoints, we eventually want to step over the |
2123 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2124 | breakpoint addresses via breakpoint_re_set. */ | |
2125 | if (breakpoints_inserted) | |
2126 | remove_breakpoints (); | |
c5aa993b | 2127 | breakpoints_inserted = 0; |
488f131b JB |
2128 | |
2129 | /* Check for any newly added shared libraries if we're | |
2130 | supposed to be adding them automatically. Switch | |
2131 | terminal for any messages produced by | |
2132 | breakpoint_re_set. */ | |
2133 | target_terminal_ours_for_output (); | |
aff6338a AC |
2134 | /* NOTE: cagney/2003-11-25: Make certain that the target |
2135 | stack's section table is kept up-to-date. Architectures, | |
2136 | (e.g., PPC64), use the section table to perform | |
2137 | operations such as address => section name and hence | |
2138 | require the table to contain all sections (including | |
2139 | those found in shared libraries). */ | |
2140 | /* NOTE: cagney/2003-11-25: Pass current_target and not | |
2141 | exec_ops to SOLIB_ADD. This is because current GDB is | |
2142 | only tooled to propagate section_table changes out from | |
2143 | the "current_target" (see target_resize_to_sections), and | |
2144 | not up from the exec stratum. This, of course, isn't | |
2145 | right. "infrun.c" should only interact with the | |
2146 | exec/process stratum, instead relying on the target stack | |
2147 | to propagate relevant changes (stop, section table | |
2148 | changed, ...) up to other layers. */ | |
2149 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); | |
488f131b JB |
2150 | target_terminal_inferior (); |
2151 | ||
2152 | /* Try to reenable shared library breakpoints, additional | |
2153 | code segments in shared libraries might be mapped in now. */ | |
2154 | re_enable_breakpoints_in_shlibs (); | |
2155 | ||
2156 | /* If requested, stop when the dynamic linker notifies | |
2157 | gdb of events. This allows the user to get control | |
2158 | and place breakpoints in initializer routines for | |
2159 | dynamically loaded objects (among other things). */ | |
877522db | 2160 | if (stop_on_solib_events || stop_stack_dummy) |
d4f3574e | 2161 | { |
488f131b | 2162 | stop_stepping (ecs); |
d4f3574e SS |
2163 | return; |
2164 | } | |
c5aa993b | 2165 | |
488f131b JB |
2166 | /* If we stopped due to an explicit catchpoint, then the |
2167 | (see above) call to SOLIB_ADD pulled in any symbols | |
2168 | from a newly-loaded library, if appropriate. | |
2169 | ||
2170 | We do want the inferior to stop, but not where it is | |
2171 | now, which is in the dynamic linker callback. Rather, | |
2172 | we would like it stop in the user's program, just after | |
2173 | the call that caused this catchpoint to trigger. That | |
2174 | gives the user a more useful vantage from which to | |
2175 | examine their program's state. */ | |
2176 | else if (what.main_action == | |
2177 | BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
c906108c | 2178 | { |
488f131b JB |
2179 | /* ??rehrauer: If I could figure out how to get the |
2180 | right return PC from here, we could just set a temp | |
2181 | breakpoint and resume. I'm not sure we can without | |
2182 | cracking open the dld's shared libraries and sniffing | |
2183 | their unwind tables and text/data ranges, and that's | |
2184 | not a terribly portable notion. | |
2185 | ||
2186 | Until that time, we must step the inferior out of the | |
2187 | dld callback, and also out of the dld itself (and any | |
2188 | code or stubs in libdld.sl, such as "shl_load" and | |
2189 | friends) until we reach non-dld code. At that point, | |
2190 | we can stop stepping. */ | |
2191 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2192 | &ecs-> | |
2193 | stepping_through_solib_catchpoints); | |
2194 | ecs->stepping_through_solib_after_catch = 1; | |
2195 | ||
2196 | /* Be sure to lift all breakpoints, so the inferior does | |
2197 | actually step past this point... */ | |
2198 | ecs->another_trap = 1; | |
2199 | break; | |
c906108c | 2200 | } |
c5aa993b | 2201 | else |
c5aa993b | 2202 | { |
488f131b | 2203 | /* We want to step over this breakpoint, then keep going. */ |
c5aa993b | 2204 | ecs->another_trap = 1; |
488f131b | 2205 | break; |
c5aa993b | 2206 | } |
488f131b JB |
2207 | } |
2208 | #endif | |
2209 | break; | |
c906108c | 2210 | |
488f131b JB |
2211 | case BPSTAT_WHAT_LAST: |
2212 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2213 | |
488f131b JB |
2214 | case BPSTAT_WHAT_KEEP_CHECKING: |
2215 | break; | |
2216 | } | |
2217 | } | |
c906108c | 2218 | |
488f131b JB |
2219 | /* We come here if we hit a breakpoint but should not |
2220 | stop for it. Possibly we also were stepping | |
2221 | and should stop for that. So fall through and | |
2222 | test for stepping. But, if not stepping, | |
2223 | do not stop. */ | |
c906108c | 2224 | |
488f131b JB |
2225 | /* Are we stepping to get the inferior out of the dynamic |
2226 | linker's hook (and possibly the dld itself) after catching | |
2227 | a shlib event? */ | |
2228 | if (ecs->stepping_through_solib_after_catch) | |
2229 | { | |
2230 | #if defined(SOLIB_ADD) | |
2231 | /* Have we reached our destination? If not, keep going. */ | |
2232 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2233 | { | |
2234 | ecs->another_trap = 1; | |
2235 | keep_going (ecs); | |
104c1213 | 2236 | return; |
488f131b JB |
2237 | } |
2238 | #endif | |
2239 | /* Else, stop and report the catchpoint(s) whose triggering | |
2240 | caused us to begin stepping. */ | |
2241 | ecs->stepping_through_solib_after_catch = 0; | |
2242 | bpstat_clear (&stop_bpstat); | |
2243 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2244 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2245 | stop_print_frame = 1; | |
2246 | stop_stepping (ecs); | |
2247 | return; | |
2248 | } | |
c906108c | 2249 | |
488f131b JB |
2250 | if (step_resume_breakpoint) |
2251 | { | |
2252 | /* Having a step-resume breakpoint overrides anything | |
2253 | else having to do with stepping commands until | |
2254 | that breakpoint is reached. */ | |
488f131b JB |
2255 | keep_going (ecs); |
2256 | return; | |
2257 | } | |
c5aa993b | 2258 | |
488f131b JB |
2259 | if (step_range_end == 0) |
2260 | { | |
2261 | /* Likewise if we aren't even stepping. */ | |
488f131b JB |
2262 | keep_going (ecs); |
2263 | return; | |
2264 | } | |
c5aa993b | 2265 | |
488f131b | 2266 | /* If stepping through a line, keep going if still within it. |
c906108c | 2267 | |
488f131b JB |
2268 | Note that step_range_end is the address of the first instruction |
2269 | beyond the step range, and NOT the address of the last instruction | |
2270 | within it! */ | |
2271 | if (stop_pc >= step_range_start && stop_pc < step_range_end) | |
2272 | { | |
488f131b JB |
2273 | keep_going (ecs); |
2274 | return; | |
2275 | } | |
c5aa993b | 2276 | |
488f131b | 2277 | /* We stepped out of the stepping range. */ |
c906108c | 2278 | |
488f131b JB |
2279 | /* If we are stepping at the source level and entered the runtime |
2280 | loader dynamic symbol resolution code, we keep on single stepping | |
2281 | until we exit the run time loader code and reach the callee's | |
2282 | address. */ | |
2283 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2284 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) | |
2285 | { | |
4c8c40e6 MK |
2286 | CORE_ADDR pc_after_resolver = |
2287 | gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); | |
c906108c | 2288 | |
488f131b JB |
2289 | if (pc_after_resolver) |
2290 | { | |
2291 | /* Set up a step-resume breakpoint at the address | |
2292 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2293 | struct symtab_and_line sr_sal; | |
fe39c653 | 2294 | init_sal (&sr_sal); |
488f131b JB |
2295 | sr_sal.pc = pc_after_resolver; |
2296 | ||
2297 | check_for_old_step_resume_breakpoint (); | |
2298 | step_resume_breakpoint = | |
818dd999 | 2299 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
488f131b JB |
2300 | if (breakpoints_inserted) |
2301 | insert_breakpoints (); | |
c5aa993b | 2302 | } |
c906108c | 2303 | |
488f131b JB |
2304 | keep_going (ecs); |
2305 | return; | |
2306 | } | |
c906108c | 2307 | |
42edda50 AC |
2308 | if (step_range_end != 1 |
2309 | && (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2310 | || step_over_calls == STEP_OVER_ALL) | |
2311 | && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME) | |
488f131b | 2312 | { |
42edda50 AC |
2313 | /* The inferior, while doing a "step" or "next", has ended up in |
2314 | a signal trampoline (either by a signal being delivered or by | |
2315 | the signal handler returning). Just single-step until the | |
2316 | inferior leaves the trampoline (either by calling the handler | |
2317 | or returning). */ | |
488f131b JB |
2318 | keep_going (ecs); |
2319 | return; | |
2320 | } | |
c906108c | 2321 | |
4a72a2a6 | 2322 | if (frame_id_eq (frame_unwind_id (get_current_frame ()), |
a587af0b | 2323 | step_frame_id)) |
488f131b JB |
2324 | { |
2325 | /* It's a subroutine call. */ | |
95918acb AC |
2326 | CORE_ADDR real_stop_pc; |
2327 | ||
2328 | if ((step_over_calls == STEP_OVER_NONE) | |
2329 | || ((step_range_end == 1) | |
2330 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
2331 | { | |
2332 | /* I presume that step_over_calls is only 0 when we're | |
2333 | supposed to be stepping at the assembly language level | |
2334 | ("stepi"). Just stop. */ | |
2335 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
2336 | thought it was a subroutine call but it was not. Stop as | |
2337 | well. FENN */ | |
2338 | stop_step = 1; | |
2339 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2340 | stop_stepping (ecs); | |
2341 | return; | |
2342 | } | |
2343 | ||
2344 | if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc)) | |
2345 | { | |
2346 | /* We're doing a "next", set a breakpoint at callee's return | |
2347 | address (the address at which the caller will | |
2348 | resume). */ | |
2349 | insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()), | |
2350 | ecs); | |
2351 | keep_going (ecs); | |
2352 | return; | |
2353 | } | |
2354 | ||
2355 | /* If we are in a function call trampoline (a stub between the | |
2356 | calling routine and the real function), locate the real | |
2357 | function. That's what tells us (a) whether we want to step | |
2358 | into it at all, and (b) what prologue we want to run to the | |
2359 | end of, if we do step into it. */ | |
2360 | real_stop_pc = skip_language_trampoline (stop_pc); | |
2361 | if (real_stop_pc == 0) | |
2362 | real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2363 | if (real_stop_pc != 0) | |
2364 | ecs->stop_func_start = real_stop_pc; | |
2365 | ||
1b2bfbb9 RC |
2366 | if (IN_SOLIB_DYNSYM_RESOLVE_CODE (ecs->stop_func_start)) |
2367 | { | |
2368 | struct symtab_and_line sr_sal; | |
2369 | init_sal (&sr_sal); | |
2370 | sr_sal.pc = ecs->stop_func_start; | |
2371 | ||
2372 | check_for_old_step_resume_breakpoint (); | |
2373 | step_resume_breakpoint = | |
2374 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); | |
2375 | if (breakpoints_inserted) | |
2376 | insert_breakpoints (); | |
2377 | ||
2378 | keep_going (ecs); | |
2379 | return; | |
2380 | } | |
2381 | ||
95918acb AC |
2382 | /* If we have line number information for the function we are |
2383 | thinking of stepping into, step into it. | |
2384 | ||
2385 | If there are several symtabs at that PC (e.g. with include | |
2386 | files), just want to know whether *any* of them have line | |
2387 | numbers. find_pc_line handles this. */ | |
2388 | { | |
2389 | struct symtab_and_line tmp_sal; | |
2390 | ||
2391 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); | |
2392 | if (tmp_sal.line != 0) | |
2393 | { | |
2394 | step_into_function (ecs); | |
2395 | return; | |
2396 | } | |
2397 | } | |
2398 | ||
2399 | /* If we have no line number and the step-stop-if-no-debug is | |
2400 | set, we stop the step so that the user has a chance to switch | |
2401 | in assembly mode. */ | |
2402 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) | |
2403 | { | |
2404 | stop_step = 1; | |
2405 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2406 | stop_stepping (ecs); | |
2407 | return; | |
2408 | } | |
2409 | ||
2410 | /* Set a breakpoint at callee's return address (the address at | |
2411 | which the caller will resume). */ | |
2412 | insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()), ecs); | |
2413 | keep_going (ecs); | |
488f131b | 2414 | return; |
488f131b | 2415 | } |
c906108c | 2416 | |
488f131b JB |
2417 | /* If we're in the return path from a shared library trampoline, |
2418 | we want to proceed through the trampoline when stepping. */ | |
2419 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2420 | { | |
488f131b | 2421 | /* Determine where this trampoline returns. */ |
5cf4d23a | 2422 | CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); |
c906108c | 2423 | |
488f131b | 2424 | /* Only proceed through if we know where it's going. */ |
d764a824 | 2425 | if (real_stop_pc) |
488f131b JB |
2426 | { |
2427 | /* And put the step-breakpoint there and go until there. */ | |
2428 | struct symtab_and_line sr_sal; | |
2429 | ||
fe39c653 | 2430 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 2431 | sr_sal.pc = real_stop_pc; |
488f131b JB |
2432 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2433 | /* Do not specify what the fp should be when we stop | |
2434 | since on some machines the prologue | |
2435 | is where the new fp value is established. */ | |
2436 | check_for_old_step_resume_breakpoint (); | |
2437 | step_resume_breakpoint = | |
818dd999 | 2438 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
488f131b JB |
2439 | if (breakpoints_inserted) |
2440 | insert_breakpoints (); | |
c906108c | 2441 | |
488f131b JB |
2442 | /* Restart without fiddling with the step ranges or |
2443 | other state. */ | |
2444 | keep_going (ecs); | |
2445 | return; | |
2446 | } | |
2447 | } | |
c906108c | 2448 | |
1b2bfbb9 RC |
2449 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
2450 | the trampoline processing logic, however, there are some trampolines | |
2451 | that have no names, so we should do trampoline handling first. */ | |
2452 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2453 | && ecs->stop_func_name == NULL) | |
2454 | { | |
2455 | /* The inferior just stepped into, or returned to, an | |
2456 | undebuggable function (where there is no symbol, not even a | |
2457 | minimal symbol, corresponding to the address where the | |
2458 | inferior stopped). Since we want to skip this kind of code, | |
2459 | we keep going until the inferior returns from this | |
2460 | function. */ | |
2461 | if (step_stop_if_no_debug) | |
2462 | { | |
2463 | /* If we have no line number and the step-stop-if-no-debug | |
2464 | is set, we stop the step so that the user has a chance to | |
2465 | switch in assembly mode. */ | |
2466 | stop_step = 1; | |
2467 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2468 | stop_stepping (ecs); | |
2469 | return; | |
2470 | } | |
2471 | else | |
2472 | { | |
2473 | /* Set a breakpoint at callee's return address (the address | |
2474 | at which the caller will resume). */ | |
2475 | insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()), | |
2476 | ecs); | |
2477 | keep_going (ecs); | |
2478 | return; | |
2479 | } | |
2480 | } | |
2481 | ||
2482 | if (step_range_end == 1) | |
2483 | { | |
2484 | /* It is stepi or nexti. We always want to stop stepping after | |
2485 | one instruction. */ | |
2486 | stop_step = 1; | |
2487 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2488 | stop_stepping (ecs); | |
2489 | return; | |
2490 | } | |
2491 | ||
2492 | ecs->sal = find_pc_line (stop_pc, 0); | |
2493 | ||
488f131b JB |
2494 | if (ecs->sal.line == 0) |
2495 | { | |
2496 | /* We have no line number information. That means to stop | |
2497 | stepping (does this always happen right after one instruction, | |
2498 | when we do "s" in a function with no line numbers, | |
2499 | or can this happen as a result of a return or longjmp?). */ | |
2500 | stop_step = 1; | |
2501 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2502 | stop_stepping (ecs); | |
2503 | return; | |
2504 | } | |
c906108c | 2505 | |
488f131b JB |
2506 | if ((stop_pc == ecs->sal.pc) |
2507 | && (ecs->current_line != ecs->sal.line | |
2508 | || ecs->current_symtab != ecs->sal.symtab)) | |
2509 | { | |
2510 | /* We are at the start of a different line. So stop. Note that | |
2511 | we don't stop if we step into the middle of a different line. | |
2512 | That is said to make things like for (;;) statements work | |
2513 | better. */ | |
2514 | stop_step = 1; | |
2515 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2516 | stop_stepping (ecs); | |
2517 | return; | |
2518 | } | |
c906108c | 2519 | |
488f131b | 2520 | /* We aren't done stepping. |
c906108c | 2521 | |
488f131b JB |
2522 | Optimize by setting the stepping range to the line. |
2523 | (We might not be in the original line, but if we entered a | |
2524 | new line in mid-statement, we continue stepping. This makes | |
2525 | things like for(;;) statements work better.) */ | |
c906108c | 2526 | |
488f131b | 2527 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
c5aa993b | 2528 | { |
488f131b JB |
2529 | /* If this is the last line of the function, don't keep stepping |
2530 | (it would probably step us out of the function). | |
2531 | This is particularly necessary for a one-line function, | |
2532 | in which after skipping the prologue we better stop even though | |
2533 | we will be in mid-line. */ | |
2534 | stop_step = 1; | |
2535 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2536 | stop_stepping (ecs); | |
2537 | return; | |
c5aa993b | 2538 | } |
488f131b JB |
2539 | step_range_start = ecs->sal.pc; |
2540 | step_range_end = ecs->sal.end; | |
aa0cd9c1 | 2541 | step_frame_id = get_frame_id (get_current_frame ()); |
488f131b JB |
2542 | ecs->current_line = ecs->sal.line; |
2543 | ecs->current_symtab = ecs->sal.symtab; | |
2544 | ||
aa0cd9c1 AC |
2545 | /* In the case where we just stepped out of a function into the |
2546 | middle of a line of the caller, continue stepping, but | |
2547 | step_frame_id must be modified to current frame */ | |
65815ea1 AC |
2548 | #if 0 |
2549 | /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too | |
2550 | generous. It will trigger on things like a step into a frameless | |
2551 | stackless leaf function. I think the logic should instead look | |
2552 | at the unwound frame ID has that should give a more robust | |
2553 | indication of what happened. */ | |
2554 | if (step-ID == current-ID) | |
2555 | still stepping in same function; | |
2556 | else if (step-ID == unwind (current-ID)) | |
2557 | stepped into a function; | |
2558 | else | |
2559 | stepped out of a function; | |
2560 | /* Of course this assumes that the frame ID unwind code is robust | |
2561 | and we're willing to introduce frame unwind logic into this | |
ce2826aa | 2562 | function. Fortunately, those days are nearly upon us. */ |
65815ea1 | 2563 | #endif |
488f131b | 2564 | { |
aa0cd9c1 AC |
2565 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
2566 | if (!(frame_id_inner (current_frame, step_frame_id))) | |
2567 | step_frame_id = current_frame; | |
488f131b | 2568 | } |
c906108c | 2569 | |
488f131b | 2570 | keep_going (ecs); |
104c1213 JM |
2571 | } |
2572 | ||
2573 | /* Are we in the middle of stepping? */ | |
2574 | ||
2575 | static int | |
2576 | currently_stepping (struct execution_control_state *ecs) | |
2577 | { | |
d303a6c7 | 2578 | return ((!ecs->handling_longjmp |
104c1213 JM |
2579 | && ((step_range_end && step_resume_breakpoint == NULL) |
2580 | || trap_expected)) | |
2581 | || ecs->stepping_through_solib_after_catch | |
2582 | || bpstat_should_step ()); | |
2583 | } | |
c906108c | 2584 | |
c2c6d25f JM |
2585 | /* Subroutine call with source code we should not step over. Do step |
2586 | to the first line of code in it. */ | |
2587 | ||
2588 | static void | |
2589 | step_into_function (struct execution_control_state *ecs) | |
2590 | { | |
2591 | struct symtab *s; | |
2592 | struct symtab_and_line sr_sal; | |
2593 | ||
2594 | s = find_pc_symtab (stop_pc); | |
2595 | if (s && s->language != language_asm) | |
2596 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
2597 | ||
2598 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2599 | /* Use the step_resume_break to step until the end of the prologue, | |
2600 | even if that involves jumps (as it seems to on the vax under | |
2601 | 4.2). */ | |
2602 | /* If the prologue ends in the middle of a source line, continue to | |
2603 | the end of that source line (if it is still within the function). | |
2604 | Otherwise, just go to end of prologue. */ | |
c2c6d25f JM |
2605 | if (ecs->sal.end |
2606 | && ecs->sal.pc != ecs->stop_func_start | |
2607 | && ecs->sal.end < ecs->stop_func_end) | |
2608 | ecs->stop_func_start = ecs->sal.end; | |
c2c6d25f | 2609 | |
2dbd5e30 KB |
2610 | /* Architectures which require breakpoint adjustment might not be able |
2611 | to place a breakpoint at the computed address. If so, the test | |
2612 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
2613 | ecs->stop_func_start to an address at which a breakpoint may be | |
2614 | legitimately placed. | |
2615 | ||
2616 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not | |
2617 | made, GDB will enter an infinite loop when stepping through | |
2618 | optimized code consisting of VLIW instructions which contain | |
2619 | subinstructions corresponding to different source lines. On | |
2620 | FR-V, it's not permitted to place a breakpoint on any but the | |
2621 | first subinstruction of a VLIW instruction. When a breakpoint is | |
2622 | set, GDB will adjust the breakpoint address to the beginning of | |
2623 | the VLIW instruction. Thus, we need to make the corresponding | |
2624 | adjustment here when computing the stop address. */ | |
2625 | ||
2626 | if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) | |
2627 | { | |
2628 | ecs->stop_func_start | |
2629 | = gdbarch_adjust_breakpoint_address (current_gdbarch, | |
2630 | ecs->stop_func_start); | |
2631 | } | |
2632 | ||
c2c6d25f JM |
2633 | if (ecs->stop_func_start == stop_pc) |
2634 | { | |
2635 | /* We are already there: stop now. */ | |
2636 | stop_step = 1; | |
488f131b | 2637 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2638 | stop_stepping (ecs); |
2639 | return; | |
2640 | } | |
2641 | else | |
2642 | { | |
2643 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 2644 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
2645 | sr_sal.pc = ecs->stop_func_start; |
2646 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
2647 | /* Do not specify what the fp should be when we stop since on | |
488f131b JB |
2648 | some machines the prologue is where the new fp value is |
2649 | established. */ | |
c2c6d25f JM |
2650 | check_for_old_step_resume_breakpoint (); |
2651 | step_resume_breakpoint = | |
818dd999 | 2652 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
c2c6d25f JM |
2653 | if (breakpoints_inserted) |
2654 | insert_breakpoints (); | |
2655 | ||
2656 | /* And make sure stepping stops right away then. */ | |
2657 | step_range_end = step_range_start; | |
2658 | } | |
2659 | keep_going (ecs); | |
2660 | } | |
d4f3574e | 2661 | |
d303a6c7 AC |
2662 | /* The inferior, as a result of a function call (has left) or signal |
2663 | (about to leave) the single-step range. Set a momentary breakpoint | |
2664 | within the step range where the inferior is expected to later | |
2665 | return. */ | |
2666 | ||
2667 | static void | |
2668 | insert_step_resume_breakpoint (struct frame_info *step_frame, | |
2669 | struct execution_control_state *ecs) | |
2670 | { | |
2671 | struct symtab_and_line sr_sal; | |
2672 | ||
2673 | /* This is only used within the step-resume range/frame. */ | |
2674 | gdb_assert (frame_id_eq (step_frame_id, get_frame_id (step_frame))); | |
2675 | gdb_assert (step_range_end != 0); | |
922d5ae0 AC |
2676 | /* Remember, if the call instruction is the last in the step range, |
2677 | the breakpoint will land just beyond that. Hence ``<= | |
2678 | step_range_end''. Also, ignore check when "nexti". */ | |
2679 | gdb_assert (step_range_start == step_range_end | |
2680 | || (get_frame_pc (step_frame) >= step_range_start | |
2681 | && get_frame_pc (step_frame) <= step_range_end)); | |
d303a6c7 AC |
2682 | |
2683 | init_sal (&sr_sal); /* initialize to zeros */ | |
2684 | ||
2685 | sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (step_frame)); | |
2686 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2687 | ||
2688 | check_for_old_step_resume_breakpoint (); | |
2689 | ||
2690 | step_resume_breakpoint | |
2691 | = set_momentary_breakpoint (sr_sal, get_frame_id (step_frame), | |
2692 | bp_step_resume); | |
2693 | ||
2694 | if (breakpoints_inserted) | |
2695 | insert_breakpoints (); | |
2696 | } | |
2697 | ||
104c1213 JM |
2698 | static void |
2699 | stop_stepping (struct execution_control_state *ecs) | |
2700 | { | |
cd0fc7c3 SS |
2701 | /* Let callers know we don't want to wait for the inferior anymore. */ |
2702 | ecs->wait_some_more = 0; | |
2703 | } | |
2704 | ||
d4f3574e SS |
2705 | /* This function handles various cases where we need to continue |
2706 | waiting for the inferior. */ | |
2707 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
2708 | ||
2709 | static void | |
2710 | keep_going (struct execution_control_state *ecs) | |
2711 | { | |
d4f3574e | 2712 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 2713 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e | 2714 | |
d4f3574e SS |
2715 | /* If we did not do break;, it means we should keep running the |
2716 | inferior and not return to debugger. */ | |
2717 | ||
2718 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
2719 | { | |
2720 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
2721 | the inferior, else we'd have done a break above) and we |
2722 | haven't yet gotten our trap. Simply continue. */ | |
d4f3574e SS |
2723 | resume (currently_stepping (ecs), stop_signal); |
2724 | } | |
2725 | else | |
2726 | { | |
2727 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
2728 | anyway (the user asked that this signal be passed to the |
2729 | child) | |
2730 | -- or -- | |
2731 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2732 | decided we should resume from it. | |
d4f3574e | 2733 | |
488f131b | 2734 | We're going to run this baby now! |
d4f3574e | 2735 | |
488f131b JB |
2736 | Insert breakpoints now, unless we are trying to one-proceed |
2737 | past a breakpoint. */ | |
d4f3574e | 2738 | /* If we've just finished a special step resume and we don't |
488f131b | 2739 | want to hit a breakpoint, pull em out. */ |
d4f3574e | 2740 | if (step_resume_breakpoint == NULL |
d4f3574e SS |
2741 | && ecs->remove_breakpoints_on_following_step) |
2742 | { | |
2743 | ecs->remove_breakpoints_on_following_step = 0; | |
2744 | remove_breakpoints (); | |
2745 | breakpoints_inserted = 0; | |
2746 | } | |
d303a6c7 | 2747 | else if (!breakpoints_inserted && !ecs->another_trap) |
d4f3574e SS |
2748 | { |
2749 | breakpoints_failed = insert_breakpoints (); | |
2750 | if (breakpoints_failed) | |
2751 | { | |
2752 | stop_stepping (ecs); | |
2753 | return; | |
2754 | } | |
2755 | breakpoints_inserted = 1; | |
2756 | } | |
2757 | ||
2758 | trap_expected = ecs->another_trap; | |
2759 | ||
2760 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
2761 | specifies that such a signal should be delivered to the |
2762 | target program). | |
2763 | ||
2764 | Typically, this would occure when a user is debugging a | |
2765 | target monitor on a simulator: the target monitor sets a | |
2766 | breakpoint; the simulator encounters this break-point and | |
2767 | halts the simulation handing control to GDB; GDB, noteing | |
2768 | that the break-point isn't valid, returns control back to the | |
2769 | simulator; the simulator then delivers the hardware | |
2770 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
2771 | ||
2772 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
2773 | stop_signal = TARGET_SIGNAL_0; |
2774 | ||
d4f3574e SS |
2775 | |
2776 | resume (currently_stepping (ecs), stop_signal); | |
2777 | } | |
2778 | ||
488f131b | 2779 | prepare_to_wait (ecs); |
d4f3574e SS |
2780 | } |
2781 | ||
104c1213 JM |
2782 | /* This function normally comes after a resume, before |
2783 | handle_inferior_event exits. It takes care of any last bits of | |
2784 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 2785 | |
104c1213 JM |
2786 | static void |
2787 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 2788 | { |
104c1213 JM |
2789 | if (ecs->infwait_state == infwait_normal_state) |
2790 | { | |
2791 | overlay_cache_invalid = 1; | |
2792 | ||
2793 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
2794 | target_wait because they can be loaded from the target while |
2795 | in target_wait. This makes remote debugging a bit more | |
2796 | efficient for those targets that provide critical registers | |
2797 | as part of their normal status mechanism. */ | |
104c1213 JM |
2798 | |
2799 | registers_changed (); | |
39f77062 | 2800 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
2801 | ecs->wp = &(ecs->ws); |
2802 | } | |
2803 | /* This is the old end of the while loop. Let everybody know we | |
2804 | want to wait for the inferior some more and get called again | |
2805 | soon. */ | |
2806 | ecs->wait_some_more = 1; | |
c906108c | 2807 | } |
11cf8741 JM |
2808 | |
2809 | /* Print why the inferior has stopped. We always print something when | |
2810 | the inferior exits, or receives a signal. The rest of the cases are | |
2811 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
2812 | there should be a call to this function from handle_inferior_event() | |
2813 | each time stop_stepping() is called.*/ | |
2814 | static void | |
2815 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
2816 | { | |
2817 | switch (stop_reason) | |
2818 | { | |
2819 | case STOP_UNKNOWN: | |
2820 | /* We don't deal with these cases from handle_inferior_event() | |
2821 | yet. */ | |
2822 | break; | |
2823 | case END_STEPPING_RANGE: | |
2824 | /* We are done with a step/next/si/ni command. */ | |
2825 | /* For now print nothing. */ | |
fb40c209 | 2826 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 2827 | operation for n > 1 */ |
fb40c209 | 2828 | if (!step_multi || !stop_step) |
9dc5e2a9 | 2829 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2830 | ui_out_field_string (uiout, "reason", "end-stepping-range"); |
11cf8741 JM |
2831 | break; |
2832 | case BREAKPOINT_HIT: | |
2833 | /* We found a breakpoint. */ | |
2834 | /* For now print nothing. */ | |
2835 | break; | |
2836 | case SIGNAL_EXITED: | |
2837 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 2838 | annotate_signalled (); |
9dc5e2a9 | 2839 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2840 | ui_out_field_string (uiout, "reason", "exited-signalled"); |
8b93c638 JM |
2841 | ui_out_text (uiout, "\nProgram terminated with signal "); |
2842 | annotate_signal_name (); | |
488f131b JB |
2843 | ui_out_field_string (uiout, "signal-name", |
2844 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2845 | annotate_signal_name_end (); |
2846 | ui_out_text (uiout, ", "); | |
2847 | annotate_signal_string (); | |
488f131b JB |
2848 | ui_out_field_string (uiout, "signal-meaning", |
2849 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2850 | annotate_signal_string_end (); |
2851 | ui_out_text (uiout, ".\n"); | |
2852 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
2853 | break; |
2854 | case EXITED: | |
2855 | /* The inferior program is finished. */ | |
8b93c638 JM |
2856 | annotate_exited (stop_info); |
2857 | if (stop_info) | |
2858 | { | |
9dc5e2a9 | 2859 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2860 | ui_out_field_string (uiout, "reason", "exited"); |
8b93c638 | 2861 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
2862 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
2863 | (unsigned int) stop_info); | |
8b93c638 JM |
2864 | ui_out_text (uiout, ".\n"); |
2865 | } | |
2866 | else | |
2867 | { | |
9dc5e2a9 | 2868 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2869 | ui_out_field_string (uiout, "reason", "exited-normally"); |
8b93c638 JM |
2870 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
2871 | } | |
11cf8741 JM |
2872 | break; |
2873 | case SIGNAL_RECEIVED: | |
2874 | /* Signal received. The signal table tells us to print about | |
2875 | it. */ | |
8b93c638 JM |
2876 | annotate_signal (); |
2877 | ui_out_text (uiout, "\nProgram received signal "); | |
2878 | annotate_signal_name (); | |
84c6c83c KS |
2879 | if (ui_out_is_mi_like_p (uiout)) |
2880 | ui_out_field_string (uiout, "reason", "signal-received"); | |
488f131b JB |
2881 | ui_out_field_string (uiout, "signal-name", |
2882 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2883 | annotate_signal_name_end (); |
2884 | ui_out_text (uiout, ", "); | |
2885 | annotate_signal_string (); | |
488f131b JB |
2886 | ui_out_field_string (uiout, "signal-meaning", |
2887 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2888 | annotate_signal_string_end (); |
2889 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
2890 | break; |
2891 | default: | |
8e65ff28 AC |
2892 | internal_error (__FILE__, __LINE__, |
2893 | "print_stop_reason: unrecognized enum value"); | |
11cf8741 JM |
2894 | break; |
2895 | } | |
2896 | } | |
c906108c | 2897 | \f |
43ff13b4 | 2898 | |
c906108c SS |
2899 | /* Here to return control to GDB when the inferior stops for real. |
2900 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
2901 | ||
2902 | STOP_PRINT_FRAME nonzero means print the executing frame | |
2903 | (pc, function, args, file, line number and line text). | |
2904 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
2905 | attempting to insert breakpoints. */ | |
2906 | ||
2907 | void | |
96baa820 | 2908 | normal_stop (void) |
c906108c | 2909 | { |
73b65bb0 DJ |
2910 | struct target_waitstatus last; |
2911 | ptid_t last_ptid; | |
2912 | ||
2913 | get_last_target_status (&last_ptid, &last); | |
2914 | ||
c906108c SS |
2915 | /* As with the notification of thread events, we want to delay |
2916 | notifying the user that we've switched thread context until | |
2917 | the inferior actually stops. | |
2918 | ||
73b65bb0 DJ |
2919 | There's no point in saying anything if the inferior has exited. |
2920 | Note that SIGNALLED here means "exited with a signal", not | |
2921 | "received a signal". */ | |
488f131b | 2922 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
73b65bb0 DJ |
2923 | && target_has_execution |
2924 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
2925 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
2926 | { |
2927 | target_terminal_ours_for_output (); | |
c3f6f71d | 2928 | printf_filtered ("[Switching to %s]\n", |
39f77062 KB |
2929 | target_pid_or_tid_to_str (inferior_ptid)); |
2930 | previous_inferior_ptid = inferior_ptid; | |
c906108c | 2931 | } |
c906108c | 2932 | |
4fa8626c | 2933 | /* NOTE drow/2004-01-17: Is this still necessary? */ |
c906108c SS |
2934 | /* Make sure that the current_frame's pc is correct. This |
2935 | is a correction for setting up the frame info before doing | |
2936 | DECR_PC_AFTER_BREAK */ | |
b87efeee AC |
2937 | if (target_has_execution) |
2938 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to | |
2939 | DECR_PC_AFTER_BREAK, the program counter can change. Ask the | |
2940 | frame code to check for this and sort out any resultant mess. | |
2941 | DECR_PC_AFTER_BREAK needs to just go away. */ | |
2f107107 | 2942 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
c906108c | 2943 | |
c906108c SS |
2944 | if (target_has_execution && breakpoints_inserted) |
2945 | { | |
2946 | if (remove_breakpoints ()) | |
2947 | { | |
2948 | target_terminal_ours_for_output (); | |
2949 | printf_filtered ("Cannot remove breakpoints because "); | |
2950 | printf_filtered ("program is no longer writable.\n"); | |
2951 | printf_filtered ("It might be running in another process.\n"); | |
2952 | printf_filtered ("Further execution is probably impossible.\n"); | |
2953 | } | |
2954 | } | |
2955 | breakpoints_inserted = 0; | |
2956 | ||
2957 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
2958 | Delete any breakpoint that is to be deleted at the next stop. */ | |
2959 | ||
2960 | breakpoint_auto_delete (stop_bpstat); | |
2961 | ||
2962 | /* If an auto-display called a function and that got a signal, | |
2963 | delete that auto-display to avoid an infinite recursion. */ | |
2964 | ||
2965 | if (stopped_by_random_signal) | |
2966 | disable_current_display (); | |
2967 | ||
2968 | /* Don't print a message if in the middle of doing a "step n" | |
2969 | operation for n > 1 */ | |
2970 | if (step_multi && stop_step) | |
2971 | goto done; | |
2972 | ||
2973 | target_terminal_ours (); | |
2974 | ||
5913bcb0 AC |
2975 | /* Look up the hook_stop and run it (CLI internally handles problem |
2976 | of stop_command's pre-hook not existing). */ | |
2977 | if (stop_command) | |
2978 | catch_errors (hook_stop_stub, stop_command, | |
2979 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
2980 | |
2981 | if (!target_has_stack) | |
2982 | { | |
2983 | ||
2984 | goto done; | |
2985 | } | |
2986 | ||
2987 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
2988 | and current location is based on that. | |
2989 | Don't do this on return from a stack dummy routine, | |
2990 | or if the program has exited. */ | |
2991 | ||
2992 | if (!stop_stack_dummy) | |
2993 | { | |
0f7d239c | 2994 | select_frame (get_current_frame ()); |
c906108c SS |
2995 | |
2996 | /* Print current location without a level number, if | |
c5aa993b JM |
2997 | we have changed functions or hit a breakpoint. |
2998 | Print source line if we have one. | |
2999 | bpstat_print() contains the logic deciding in detail | |
3000 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3001 | |
6e7f8b9c | 3002 | if (stop_print_frame && deprecated_selected_frame) |
c906108c SS |
3003 | { |
3004 | int bpstat_ret; | |
3005 | int source_flag; | |
917317f4 | 3006 | int do_frame_printing = 1; |
c906108c SS |
3007 | |
3008 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3009 | switch (bpstat_ret) |
3010 | { | |
3011 | case PRINT_UNKNOWN: | |
aa0cd9c1 AC |
3012 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
3013 | (or should) carry around the function and does (or | |
3014 | should) use that when doing a frame comparison. */ | |
917317f4 | 3015 | if (stop_step |
aa0cd9c1 AC |
3016 | && frame_id_eq (step_frame_id, |
3017 | get_frame_id (get_current_frame ())) | |
917317f4 | 3018 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3019 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3020 | else |
488f131b | 3021 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3022 | break; |
3023 | case PRINT_SRC_AND_LOC: | |
488f131b | 3024 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3025 | break; |
3026 | case PRINT_SRC_ONLY: | |
c5394b80 | 3027 | source_flag = SRC_LINE; |
917317f4 JM |
3028 | break; |
3029 | case PRINT_NOTHING: | |
488f131b | 3030 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3031 | do_frame_printing = 0; |
3032 | break; | |
3033 | default: | |
488f131b | 3034 | internal_error (__FILE__, __LINE__, "Unknown value."); |
917317f4 | 3035 | } |
fb40c209 | 3036 | /* For mi, have the same behavior every time we stop: |
488f131b | 3037 | print everything but the source line. */ |
9dc5e2a9 | 3038 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3039 | source_flag = LOC_AND_ADDRESS; |
c906108c | 3040 | |
9dc5e2a9 | 3041 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 | 3042 | ui_out_field_int (uiout, "thread-id", |
488f131b | 3043 | pid_to_thread_id (inferior_ptid)); |
c906108c SS |
3044 | /* The behavior of this routine with respect to the source |
3045 | flag is: | |
c5394b80 JM |
3046 | SRC_LINE: Print only source line |
3047 | LOCATION: Print only location | |
3048 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3049 | if (do_frame_printing) |
0faf0076 | 3050 | print_stack_frame (get_selected_frame (), 0, source_flag); |
c906108c SS |
3051 | |
3052 | /* Display the auto-display expressions. */ | |
3053 | do_displays (); | |
3054 | } | |
3055 | } | |
3056 | ||
3057 | /* Save the function value return registers, if we care. | |
3058 | We might be about to restore their previous contents. */ | |
3059 | if (proceed_to_finish) | |
72cec141 AC |
3060 | /* NB: The copy goes through to the target picking up the value of |
3061 | all the registers. */ | |
3062 | regcache_cpy (stop_registers, current_regcache); | |
c906108c SS |
3063 | |
3064 | if (stop_stack_dummy) | |
3065 | { | |
dbe9fe58 AC |
3066 | /* Pop the empty frame that contains the stack dummy. POP_FRAME |
3067 | ends with a setting of the current frame, so we can use that | |
3068 | next. */ | |
3069 | frame_pop (get_current_frame ()); | |
c906108c | 3070 | /* Set stop_pc to what it was before we called the function. |
c5aa993b JM |
3071 | Can't rely on restore_inferior_status because that only gets |
3072 | called if we don't stop in the called function. */ | |
c906108c | 3073 | stop_pc = read_pc (); |
0f7d239c | 3074 | select_frame (get_current_frame ()); |
c906108c SS |
3075 | } |
3076 | ||
c906108c SS |
3077 | done: |
3078 | annotate_stopped (); | |
7a464420 | 3079 | observer_notify_normal_stop (stop_bpstat); |
c906108c SS |
3080 | } |
3081 | ||
3082 | static int | |
96baa820 | 3083 | hook_stop_stub (void *cmd) |
c906108c | 3084 | { |
5913bcb0 | 3085 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3086 | return (0); |
3087 | } | |
3088 | \f | |
c5aa993b | 3089 | int |
96baa820 | 3090 | signal_stop_state (int signo) |
c906108c SS |
3091 | { |
3092 | return signal_stop[signo]; | |
3093 | } | |
3094 | ||
c5aa993b | 3095 | int |
96baa820 | 3096 | signal_print_state (int signo) |
c906108c SS |
3097 | { |
3098 | return signal_print[signo]; | |
3099 | } | |
3100 | ||
c5aa993b | 3101 | int |
96baa820 | 3102 | signal_pass_state (int signo) |
c906108c SS |
3103 | { |
3104 | return signal_program[signo]; | |
3105 | } | |
3106 | ||
488f131b | 3107 | int |
7bda5e4a | 3108 | signal_stop_update (int signo, int state) |
d4f3574e SS |
3109 | { |
3110 | int ret = signal_stop[signo]; | |
3111 | signal_stop[signo] = state; | |
3112 | return ret; | |
3113 | } | |
3114 | ||
488f131b | 3115 | int |
7bda5e4a | 3116 | signal_print_update (int signo, int state) |
d4f3574e SS |
3117 | { |
3118 | int ret = signal_print[signo]; | |
3119 | signal_print[signo] = state; | |
3120 | return ret; | |
3121 | } | |
3122 | ||
488f131b | 3123 | int |
7bda5e4a | 3124 | signal_pass_update (int signo, int state) |
d4f3574e SS |
3125 | { |
3126 | int ret = signal_program[signo]; | |
3127 | signal_program[signo] = state; | |
3128 | return ret; | |
3129 | } | |
3130 | ||
c906108c | 3131 | static void |
96baa820 | 3132 | sig_print_header (void) |
c906108c SS |
3133 | { |
3134 | printf_filtered ("\ | |
3135 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3136 | } | |
3137 | ||
3138 | static void | |
96baa820 | 3139 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3140 | { |
3141 | char *name = target_signal_to_name (oursig); | |
3142 | int name_padding = 13 - strlen (name); | |
96baa820 | 3143 | |
c906108c SS |
3144 | if (name_padding <= 0) |
3145 | name_padding = 0; | |
3146 | ||
3147 | printf_filtered ("%s", name); | |
488f131b | 3148 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
3149 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3150 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3151 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3152 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3153 | } | |
3154 | ||
3155 | /* Specify how various signals in the inferior should be handled. */ | |
3156 | ||
3157 | static void | |
96baa820 | 3158 | handle_command (char *args, int from_tty) |
c906108c SS |
3159 | { |
3160 | char **argv; | |
3161 | int digits, wordlen; | |
3162 | int sigfirst, signum, siglast; | |
3163 | enum target_signal oursig; | |
3164 | int allsigs; | |
3165 | int nsigs; | |
3166 | unsigned char *sigs; | |
3167 | struct cleanup *old_chain; | |
3168 | ||
3169 | if (args == NULL) | |
3170 | { | |
3171 | error_no_arg ("signal to handle"); | |
3172 | } | |
3173 | ||
3174 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3175 | ||
3176 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3177 | sigs = (unsigned char *) alloca (nsigs); | |
3178 | memset (sigs, 0, nsigs); | |
3179 | ||
3180 | /* Break the command line up into args. */ | |
3181 | ||
3182 | argv = buildargv (args); | |
3183 | if (argv == NULL) | |
3184 | { | |
3185 | nomem (0); | |
3186 | } | |
7a292a7a | 3187 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3188 | |
3189 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3190 | actions. Signal numbers and signal names may be interspersed with | |
3191 | actions, with the actions being performed for all signals cumulatively | |
3192 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3193 | ||
3194 | while (*argv != NULL) | |
3195 | { | |
3196 | wordlen = strlen (*argv); | |
3197 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3198 | {; | |
3199 | } | |
3200 | allsigs = 0; | |
3201 | sigfirst = siglast = -1; | |
3202 | ||
3203 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3204 | { | |
3205 | /* Apply action to all signals except those used by the | |
3206 | debugger. Silently skip those. */ | |
3207 | allsigs = 1; | |
3208 | sigfirst = 0; | |
3209 | siglast = nsigs - 1; | |
3210 | } | |
3211 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3212 | { | |
3213 | SET_SIGS (nsigs, sigs, signal_stop); | |
3214 | SET_SIGS (nsigs, sigs, signal_print); | |
3215 | } | |
3216 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3217 | { | |
3218 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3219 | } | |
3220 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3221 | { | |
3222 | SET_SIGS (nsigs, sigs, signal_print); | |
3223 | } | |
3224 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3225 | { | |
3226 | SET_SIGS (nsigs, sigs, signal_program); | |
3227 | } | |
3228 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3229 | { | |
3230 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3231 | } | |
3232 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3233 | { | |
3234 | SET_SIGS (nsigs, sigs, signal_program); | |
3235 | } | |
3236 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3237 | { | |
3238 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3239 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3240 | } | |
3241 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3242 | { | |
3243 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3244 | } | |
3245 | else if (digits > 0) | |
3246 | { | |
3247 | /* It is numeric. The numeric signal refers to our own | |
3248 | internal signal numbering from target.h, not to host/target | |
3249 | signal number. This is a feature; users really should be | |
3250 | using symbolic names anyway, and the common ones like | |
3251 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3252 | ||
3253 | sigfirst = siglast = (int) | |
3254 | target_signal_from_command (atoi (*argv)); | |
3255 | if ((*argv)[digits] == '-') | |
3256 | { | |
3257 | siglast = (int) | |
3258 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3259 | } | |
3260 | if (sigfirst > siglast) | |
3261 | { | |
3262 | /* Bet he didn't figure we'd think of this case... */ | |
3263 | signum = sigfirst; | |
3264 | sigfirst = siglast; | |
3265 | siglast = signum; | |
3266 | } | |
3267 | } | |
3268 | else | |
3269 | { | |
3270 | oursig = target_signal_from_name (*argv); | |
3271 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3272 | { | |
3273 | sigfirst = siglast = (int) oursig; | |
3274 | } | |
3275 | else | |
3276 | { | |
3277 | /* Not a number and not a recognized flag word => complain. */ | |
3278 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3279 | } | |
3280 | } | |
3281 | ||
3282 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3283 | which signals to apply actions to. */ |
c906108c SS |
3284 | |
3285 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3286 | { | |
3287 | switch ((enum target_signal) signum) | |
3288 | { | |
3289 | case TARGET_SIGNAL_TRAP: | |
3290 | case TARGET_SIGNAL_INT: | |
3291 | if (!allsigs && !sigs[signum]) | |
3292 | { | |
3293 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 3294 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
3295 | { |
3296 | sigs[signum] = 1; | |
3297 | } | |
3298 | else | |
3299 | { | |
3300 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3301 | gdb_flush (gdb_stdout); | |
3302 | } | |
3303 | } | |
3304 | break; | |
3305 | case TARGET_SIGNAL_0: | |
3306 | case TARGET_SIGNAL_DEFAULT: | |
3307 | case TARGET_SIGNAL_UNKNOWN: | |
3308 | /* Make sure that "all" doesn't print these. */ | |
3309 | break; | |
3310 | default: | |
3311 | sigs[signum] = 1; | |
3312 | break; | |
3313 | } | |
3314 | } | |
3315 | ||
3316 | argv++; | |
3317 | } | |
3318 | ||
39f77062 | 3319 | target_notice_signals (inferior_ptid); |
c906108c SS |
3320 | |
3321 | if (from_tty) | |
3322 | { | |
3323 | /* Show the results. */ | |
3324 | sig_print_header (); | |
3325 | for (signum = 0; signum < nsigs; signum++) | |
3326 | { | |
3327 | if (sigs[signum]) | |
3328 | { | |
3329 | sig_print_info (signum); | |
3330 | } | |
3331 | } | |
3332 | } | |
3333 | ||
3334 | do_cleanups (old_chain); | |
3335 | } | |
3336 | ||
3337 | static void | |
96baa820 | 3338 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3339 | { |
3340 | char **argv; | |
3341 | struct cleanup *old_chain; | |
3342 | ||
3343 | /* Break the command line up into args. */ | |
3344 | ||
3345 | argv = buildargv (args); | |
3346 | if (argv == NULL) | |
3347 | { | |
3348 | nomem (0); | |
3349 | } | |
7a292a7a | 3350 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3351 | if (argv[1] != (char *) NULL) |
3352 | { | |
3353 | char *argBuf; | |
3354 | int bufLen; | |
3355 | ||
3356 | bufLen = strlen (argv[0]) + 20; | |
3357 | argBuf = (char *) xmalloc (bufLen); | |
3358 | if (argBuf) | |
3359 | { | |
3360 | int validFlag = 1; | |
3361 | enum target_signal oursig; | |
3362 | ||
3363 | oursig = target_signal_from_name (argv[0]); | |
3364 | memset (argBuf, 0, bufLen); | |
3365 | if (strcmp (argv[1], "Q") == 0) | |
3366 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3367 | else | |
3368 | { | |
3369 | if (strcmp (argv[1], "s") == 0) | |
3370 | { | |
3371 | if (!signal_stop[oursig]) | |
3372 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3373 | else | |
3374 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3375 | } | |
3376 | else if (strcmp (argv[1], "i") == 0) | |
3377 | { | |
3378 | if (!signal_program[oursig]) | |
3379 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3380 | else | |
3381 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3382 | } | |
3383 | else if (strcmp (argv[1], "r") == 0) | |
3384 | { | |
3385 | if (!signal_print[oursig]) | |
3386 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3387 | else | |
3388 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3389 | } | |
3390 | else | |
3391 | validFlag = 0; | |
3392 | } | |
3393 | if (validFlag) | |
3394 | handle_command (argBuf, from_tty); | |
3395 | else | |
3396 | printf_filtered ("Invalid signal handling flag.\n"); | |
3397 | if (argBuf) | |
b8c9b27d | 3398 | xfree (argBuf); |
c906108c SS |
3399 | } |
3400 | } | |
3401 | do_cleanups (old_chain); | |
3402 | } | |
3403 | ||
3404 | /* Print current contents of the tables set by the handle command. | |
3405 | It is possible we should just be printing signals actually used | |
3406 | by the current target (but for things to work right when switching | |
3407 | targets, all signals should be in the signal tables). */ | |
3408 | ||
3409 | static void | |
96baa820 | 3410 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3411 | { |
3412 | enum target_signal oursig; | |
3413 | sig_print_header (); | |
3414 | ||
3415 | if (signum_exp) | |
3416 | { | |
3417 | /* First see if this is a symbol name. */ | |
3418 | oursig = target_signal_from_name (signum_exp); | |
3419 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3420 | { | |
3421 | /* No, try numeric. */ | |
3422 | oursig = | |
bb518678 | 3423 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3424 | } |
3425 | sig_print_info (oursig); | |
3426 | return; | |
3427 | } | |
3428 | ||
3429 | printf_filtered ("\n"); | |
3430 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3431 | for (oursig = TARGET_SIGNAL_FIRST; | |
3432 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3433 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3434 | { | |
3435 | QUIT; | |
3436 | ||
3437 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 3438 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
3439 | sig_print_info (oursig); |
3440 | } | |
3441 | ||
3442 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3443 | } | |
3444 | \f | |
7a292a7a SS |
3445 | struct inferior_status |
3446 | { | |
3447 | enum target_signal stop_signal; | |
3448 | CORE_ADDR stop_pc; | |
3449 | bpstat stop_bpstat; | |
3450 | int stop_step; | |
3451 | int stop_stack_dummy; | |
3452 | int stopped_by_random_signal; | |
3453 | int trap_expected; | |
3454 | CORE_ADDR step_range_start; | |
3455 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 3456 | struct frame_id step_frame_id; |
5fbbeb29 | 3457 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3458 | CORE_ADDR step_resume_break_address; |
3459 | int stop_after_trap; | |
c0236d92 | 3460 | int stop_soon; |
72cec141 | 3461 | struct regcache *stop_registers; |
7a292a7a SS |
3462 | |
3463 | /* These are here because if call_function_by_hand has written some | |
3464 | registers and then decides to call error(), we better not have changed | |
3465 | any registers. */ | |
72cec141 | 3466 | struct regcache *registers; |
7a292a7a | 3467 | |
101dcfbe AC |
3468 | /* A frame unique identifier. */ |
3469 | struct frame_id selected_frame_id; | |
3470 | ||
7a292a7a SS |
3471 | int breakpoint_proceeded; |
3472 | int restore_stack_info; | |
3473 | int proceed_to_finish; | |
3474 | }; | |
3475 | ||
7a292a7a | 3476 | void |
96baa820 JM |
3477 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3478 | LONGEST val) | |
7a292a7a | 3479 | { |
12c266ea | 3480 | int size = DEPRECATED_REGISTER_RAW_SIZE (regno); |
7a292a7a SS |
3481 | void *buf = alloca (size); |
3482 | store_signed_integer (buf, size, val); | |
0818c12a | 3483 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
3484 | } |
3485 | ||
c906108c SS |
3486 | /* Save all of the information associated with the inferior<==>gdb |
3487 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3488 | (defined in inferior.h). */ | |
3489 | ||
7a292a7a | 3490 | struct inferior_status * |
96baa820 | 3491 | save_inferior_status (int restore_stack_info) |
c906108c | 3492 | { |
72cec141 | 3493 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 3494 | |
c906108c SS |
3495 | inf_status->stop_signal = stop_signal; |
3496 | inf_status->stop_pc = stop_pc; | |
3497 | inf_status->stop_step = stop_step; | |
3498 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3499 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3500 | inf_status->trap_expected = trap_expected; | |
3501 | inf_status->step_range_start = step_range_start; | |
3502 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 3503 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
3504 | inf_status->step_over_calls = step_over_calls; |
3505 | inf_status->stop_after_trap = stop_after_trap; | |
c0236d92 | 3506 | inf_status->stop_soon = stop_soon; |
c906108c SS |
3507 | /* Save original bpstat chain here; replace it with copy of chain. |
3508 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3509 | hand them back the original chain when restore_inferior_status is |
3510 | called. */ | |
c906108c SS |
3511 | inf_status->stop_bpstat = stop_bpstat; |
3512 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3513 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3514 | inf_status->restore_stack_info = restore_stack_info; | |
3515 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3516 | |
72cec141 | 3517 | inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers); |
c906108c | 3518 | |
72cec141 | 3519 | inf_status->registers = regcache_dup (current_regcache); |
c906108c | 3520 | |
7a424e99 | 3521 | inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame); |
7a292a7a | 3522 | return inf_status; |
c906108c SS |
3523 | } |
3524 | ||
c906108c | 3525 | static int |
96baa820 | 3526 | restore_selected_frame (void *args) |
c906108c | 3527 | { |
488f131b | 3528 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 3529 | struct frame_info *frame; |
c906108c | 3530 | |
101dcfbe | 3531 | frame = frame_find_by_id (*fid); |
c906108c | 3532 | |
aa0cd9c1 AC |
3533 | /* If inf_status->selected_frame_id is NULL, there was no previously |
3534 | selected frame. */ | |
101dcfbe | 3535 | if (frame == NULL) |
c906108c SS |
3536 | { |
3537 | warning ("Unable to restore previously selected frame.\n"); | |
3538 | return 0; | |
3539 | } | |
3540 | ||
0f7d239c | 3541 | select_frame (frame); |
c906108c SS |
3542 | |
3543 | return (1); | |
3544 | } | |
3545 | ||
3546 | void | |
96baa820 | 3547 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3548 | { |
3549 | stop_signal = inf_status->stop_signal; | |
3550 | stop_pc = inf_status->stop_pc; | |
3551 | stop_step = inf_status->stop_step; | |
3552 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3553 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3554 | trap_expected = inf_status->trap_expected; | |
3555 | step_range_start = inf_status->step_range_start; | |
3556 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 3557 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
3558 | step_over_calls = inf_status->step_over_calls; |
3559 | stop_after_trap = inf_status->stop_after_trap; | |
c0236d92 | 3560 | stop_soon = inf_status->stop_soon; |
c906108c SS |
3561 | bpstat_clear (&stop_bpstat); |
3562 | stop_bpstat = inf_status->stop_bpstat; | |
3563 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3564 | proceed_to_finish = inf_status->proceed_to_finish; | |
3565 | ||
72cec141 AC |
3566 | /* FIXME: Is the restore of stop_registers always needed. */ |
3567 | regcache_xfree (stop_registers); | |
3568 | stop_registers = inf_status->stop_registers; | |
c906108c SS |
3569 | |
3570 | /* The inferior can be gone if the user types "print exit(0)" | |
3571 | (and perhaps other times). */ | |
3572 | if (target_has_execution) | |
72cec141 AC |
3573 | /* NB: The register write goes through to the target. */ |
3574 | regcache_cpy (current_regcache, inf_status->registers); | |
3575 | regcache_xfree (inf_status->registers); | |
c906108c | 3576 | |
c906108c SS |
3577 | /* FIXME: If we are being called after stopping in a function which |
3578 | is called from gdb, we should not be trying to restore the | |
3579 | selected frame; it just prints a spurious error message (The | |
3580 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3581 | clobbers the stack)). In fact, should we be restoring the | |
3582 | inferior status at all in that case? . */ | |
3583 | ||
3584 | if (target_has_stack && inf_status->restore_stack_info) | |
3585 | { | |
c906108c | 3586 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
3587 | walking the stack might encounter a garbage pointer and |
3588 | error() trying to dereference it. */ | |
488f131b JB |
3589 | if (catch_errors |
3590 | (restore_selected_frame, &inf_status->selected_frame_id, | |
3591 | "Unable to restore previously selected frame:\n", | |
3592 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
3593 | /* Error in restoring the selected frame. Select the innermost |
3594 | frame. */ | |
0f7d239c | 3595 | select_frame (get_current_frame ()); |
c906108c SS |
3596 | |
3597 | } | |
c906108c | 3598 | |
72cec141 | 3599 | xfree (inf_status); |
7a292a7a | 3600 | } |
c906108c | 3601 | |
74b7792f AC |
3602 | static void |
3603 | do_restore_inferior_status_cleanup (void *sts) | |
3604 | { | |
3605 | restore_inferior_status (sts); | |
3606 | } | |
3607 | ||
3608 | struct cleanup * | |
3609 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
3610 | { | |
3611 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
3612 | } | |
3613 | ||
c906108c | 3614 | void |
96baa820 | 3615 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3616 | { |
3617 | /* See save_inferior_status for info on stop_bpstat. */ | |
3618 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 AC |
3619 | regcache_xfree (inf_status->registers); |
3620 | regcache_xfree (inf_status->stop_registers); | |
3621 | xfree (inf_status); | |
7a292a7a SS |
3622 | } |
3623 | ||
47932f85 DJ |
3624 | int |
3625 | inferior_has_forked (int pid, int *child_pid) | |
3626 | { | |
3627 | struct target_waitstatus last; | |
3628 | ptid_t last_ptid; | |
3629 | ||
3630 | get_last_target_status (&last_ptid, &last); | |
3631 | ||
3632 | if (last.kind != TARGET_WAITKIND_FORKED) | |
3633 | return 0; | |
3634 | ||
3635 | if (ptid_get_pid (last_ptid) != pid) | |
3636 | return 0; | |
3637 | ||
3638 | *child_pid = last.value.related_pid; | |
3639 | return 1; | |
3640 | } | |
3641 | ||
3642 | int | |
3643 | inferior_has_vforked (int pid, int *child_pid) | |
3644 | { | |
3645 | struct target_waitstatus last; | |
3646 | ptid_t last_ptid; | |
3647 | ||
3648 | get_last_target_status (&last_ptid, &last); | |
3649 | ||
3650 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
3651 | return 0; | |
3652 | ||
3653 | if (ptid_get_pid (last_ptid) != pid) | |
3654 | return 0; | |
3655 | ||
3656 | *child_pid = last.value.related_pid; | |
3657 | return 1; | |
3658 | } | |
3659 | ||
3660 | int | |
3661 | inferior_has_execd (int pid, char **execd_pathname) | |
3662 | { | |
3663 | struct target_waitstatus last; | |
3664 | ptid_t last_ptid; | |
3665 | ||
3666 | get_last_target_status (&last_ptid, &last); | |
3667 | ||
3668 | if (last.kind != TARGET_WAITKIND_EXECD) | |
3669 | return 0; | |
3670 | ||
3671 | if (ptid_get_pid (last_ptid) != pid) | |
3672 | return 0; | |
3673 | ||
3674 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
3675 | return 1; | |
3676 | } | |
3677 | ||
ca6724c1 KB |
3678 | /* Oft used ptids */ |
3679 | ptid_t null_ptid; | |
3680 | ptid_t minus_one_ptid; | |
3681 | ||
3682 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 3683 | |
ca6724c1 KB |
3684 | ptid_t |
3685 | ptid_build (int pid, long lwp, long tid) | |
3686 | { | |
3687 | ptid_t ptid; | |
3688 | ||
3689 | ptid.pid = pid; | |
3690 | ptid.lwp = lwp; | |
3691 | ptid.tid = tid; | |
3692 | return ptid; | |
3693 | } | |
3694 | ||
3695 | /* Create a ptid from just a pid. */ | |
3696 | ||
3697 | ptid_t | |
3698 | pid_to_ptid (int pid) | |
3699 | { | |
3700 | return ptid_build (pid, 0, 0); | |
3701 | } | |
3702 | ||
3703 | /* Fetch the pid (process id) component from a ptid. */ | |
3704 | ||
3705 | int | |
3706 | ptid_get_pid (ptid_t ptid) | |
3707 | { | |
3708 | return ptid.pid; | |
3709 | } | |
3710 | ||
3711 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
3712 | ||
3713 | long | |
3714 | ptid_get_lwp (ptid_t ptid) | |
3715 | { | |
3716 | return ptid.lwp; | |
3717 | } | |
3718 | ||
3719 | /* Fetch the tid (thread id) component from a ptid. */ | |
3720 | ||
3721 | long | |
3722 | ptid_get_tid (ptid_t ptid) | |
3723 | { | |
3724 | return ptid.tid; | |
3725 | } | |
3726 | ||
3727 | /* ptid_equal() is used to test equality of two ptids. */ | |
3728 | ||
3729 | int | |
3730 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
3731 | { | |
3732 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 3733 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
3734 | } |
3735 | ||
3736 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
3737 | to restore the inferior_ptid value saved in a call to | |
3738 | save_inferior_ptid(). */ | |
ce696e05 KB |
3739 | |
3740 | static void | |
3741 | restore_inferior_ptid (void *arg) | |
3742 | { | |
3743 | ptid_t *saved_ptid_ptr = arg; | |
3744 | inferior_ptid = *saved_ptid_ptr; | |
3745 | xfree (arg); | |
3746 | } | |
3747 | ||
3748 | /* Save the value of inferior_ptid so that it may be restored by a | |
3749 | later call to do_cleanups(). Returns the struct cleanup pointer | |
3750 | needed for later doing the cleanup. */ | |
3751 | ||
3752 | struct cleanup * | |
3753 | save_inferior_ptid (void) | |
3754 | { | |
3755 | ptid_t *saved_ptid_ptr; | |
3756 | ||
3757 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
3758 | *saved_ptid_ptr = inferior_ptid; | |
3759 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
3760 | } | |
c5aa993b | 3761 | \f |
488f131b | 3762 | |
7a292a7a | 3763 | static void |
96baa820 | 3764 | build_infrun (void) |
7a292a7a | 3765 | { |
72cec141 | 3766 | stop_registers = regcache_xmalloc (current_gdbarch); |
7a292a7a | 3767 | } |
c906108c | 3768 | |
c906108c | 3769 | void |
96baa820 | 3770 | _initialize_infrun (void) |
c906108c | 3771 | { |
52f0bd74 AC |
3772 | int i; |
3773 | int numsigs; | |
c906108c SS |
3774 | struct cmd_list_element *c; |
3775 | ||
046a4708 AC |
3776 | DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers); |
3777 | deprecated_register_gdbarch_swap (NULL, 0, build_infrun); | |
0f71a2f6 | 3778 | |
c906108c SS |
3779 | add_info ("signals", signals_info, |
3780 | "What debugger does when program gets various signals.\n\ | |
3781 | Specify a signal as argument to print info on that signal only."); | |
3782 | add_info_alias ("handle", "signals", 0); | |
3783 | ||
3784 | add_com ("handle", class_run, handle_command, | |
3785 | concat ("Specify how to handle a signal.\n\ | |
3786 | Args are signals and actions to apply to those signals.\n\ | |
3787 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3788 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3789 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3790 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3791 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
3792 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
3793 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3794 | Print means print a message if this signal happens.\n\ | |
3795 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3796 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3797 | Pass and Stop may be combined.", NULL)); | |
3798 | if (xdb_commands) | |
3799 | { | |
3800 | add_com ("lz", class_info, signals_info, | |
3801 | "What debugger does when program gets various signals.\n\ | |
3802 | Specify a signal as argument to print info on that signal only."); | |
3803 | add_com ("z", class_run, xdb_handle_command, | |
3804 | concat ("Specify how to handle a signal.\n\ | |
3805 | Args are signals and actions to apply to those signals.\n\ | |
3806 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3807 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3808 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3809 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3810 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\ |
c906108c SS |
3811 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
3812 | nopass), \"Q\" (noprint)\n\ | |
3813 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3814 | Print means print a message if this signal happens.\n\ | |
3815 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3816 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3817 | Pass and Stop may be combined.", NULL)); | |
3818 | } | |
3819 | ||
3820 | if (!dbx_commands) | |
488f131b JB |
3821 | stop_command = |
3822 | add_cmd ("stop", class_obscure, not_just_help_class_command, "There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c SS |
3823 | This allows you to set a list of commands to be run each time execution\n\ |
3824 | of the program stops.", &cmdlist); | |
3825 | ||
3826 | numsigs = (int) TARGET_SIGNAL_LAST; | |
488f131b | 3827 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
3828 | signal_print = (unsigned char *) |
3829 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
3830 | signal_program = (unsigned char *) | |
3831 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
3832 | for (i = 0; i < numsigs; i++) | |
3833 | { | |
3834 | signal_stop[i] = 1; | |
3835 | signal_print[i] = 1; | |
3836 | signal_program[i] = 1; | |
3837 | } | |
3838 | ||
3839 | /* Signals caused by debugger's own actions | |
3840 | should not be given to the program afterwards. */ | |
3841 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
3842 | signal_program[TARGET_SIGNAL_INT] = 0; | |
3843 | ||
3844 | /* Signals that are not errors should not normally enter the debugger. */ | |
3845 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
3846 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
3847 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
3848 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
3849 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
3850 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
3851 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
3852 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
3853 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
3854 | signal_print[TARGET_SIGNAL_IO] = 0; | |
3855 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
3856 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
3857 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
3858 | signal_print[TARGET_SIGNAL_URG] = 0; | |
3859 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
3860 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
3861 | ||
cd0fc7c3 SS |
3862 | /* These signals are used internally by user-level thread |
3863 | implementations. (See signal(5) on Solaris.) Like the above | |
3864 | signals, a healthy program receives and handles them as part of | |
3865 | its normal operation. */ | |
3866 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
3867 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
3868 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
3869 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
3870 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
3871 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
3872 | ||
c906108c SS |
3873 | #ifdef SOLIB_ADD |
3874 | add_show_from_set | |
3875 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, | |
3876 | (char *) &stop_on_solib_events, | |
3877 | "Set stopping for shared library events.\n\ | |
3878 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
3879 | notifies gdb of shared library events. The most common event of interest\n\ | |
488f131b | 3880 | to the user would be loading/unloading of a new library.\n", &setlist), &showlist); |
c906108c SS |
3881 | #endif |
3882 | ||
3883 | c = add_set_enum_cmd ("follow-fork-mode", | |
3884 | class_run, | |
488f131b | 3885 | follow_fork_mode_kind_names, &follow_fork_mode_string, |
c906108c SS |
3886 | "Set debugger response to a program call of fork \ |
3887 | or vfork.\n\ | |
3888 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
3889 | parent - the original process is debugged after a fork\n\ | |
3890 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 3891 | The unfollowed process will continue to run.\n\ |
488f131b | 3892 | By default, the debugger will follow the parent process.", &setlist); |
c906108c SS |
3893 | add_show_from_set (c, &showlist); |
3894 | ||
488f131b | 3895 | c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */ |
1ed2a135 | 3896 | &scheduler_mode, /* current mode */ |
c906108c SS |
3897 | "Set mode for locking scheduler during execution.\n\ |
3898 | off == no locking (threads may preempt at any time)\n\ | |
3899 | on == full locking (no thread except the current thread may run)\n\ | |
3900 | step == scheduler locked during every single-step operation.\n\ | |
3901 | In this mode, no other thread may run during a step command.\n\ | |
488f131b | 3902 | Other threads may run while stepping over a function call ('next').", &setlist); |
c906108c | 3903 | |
9f60d481 | 3904 | set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */ |
c906108c | 3905 | add_show_from_set (c, &showlist); |
5fbbeb29 CF |
3906 | |
3907 | c = add_set_cmd ("step-mode", class_run, | |
488f131b JB |
3908 | var_boolean, (char *) &step_stop_if_no_debug, |
3909 | "Set mode of the step operation. When set, doing a step over a\n\ | |
5fbbeb29 CF |
3910 | function without debug line information will stop at the first\n\ |
3911 | instruction of that function. Otherwise, the function is skipped and\n\ | |
488f131b | 3912 | the step command stops at a different source line.", &setlist); |
5fbbeb29 | 3913 | add_show_from_set (c, &showlist); |
ca6724c1 KB |
3914 | |
3915 | /* ptid initializations */ | |
3916 | null_ptid = ptid_build (0, 0, 0); | |
3917 | minus_one_ptid = ptid_build (-1, 0, 0); | |
3918 | inferior_ptid = null_ptid; | |
3919 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 3920 | } |