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Commit | Line | Data |
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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 | ||
265 | #ifdef HP_OS_BUG | |
266 | /* Nonzero if the next time we try to continue the inferior, it will | |
267 | step one instruction and generate a spurious trace trap. | |
268 | This is used to compensate for a bug in HP-UX. */ | |
269 | ||
270 | static int trap_expected_after_continue; | |
271 | #endif | |
272 | ||
273 | /* Nonzero means expecting a trace trap | |
274 | and should stop the inferior and return silently when it happens. */ | |
275 | ||
276 | int stop_after_trap; | |
277 | ||
278 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
279 | It is used after attach, due to attaching to a process; | |
280 | when running in the shell before the child program has been exec'd; | |
281 | and when running some kinds of remote stuff (FIXME?). */ | |
282 | ||
c0236d92 | 283 | enum stop_kind stop_soon; |
c906108c SS |
284 | |
285 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
286 | situation when stop_registers should be saved. */ | |
287 | ||
288 | int proceed_to_finish; | |
289 | ||
290 | /* Save register contents here when about to pop a stack dummy frame, | |
291 | if-and-only-if proceed_to_finish is set. | |
292 | Thus this contains the return value from the called function (assuming | |
293 | values are returned in a register). */ | |
294 | ||
72cec141 | 295 | struct regcache *stop_registers; |
c906108c SS |
296 | |
297 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
298 | ||
299 | static int breakpoints_failed; | |
300 | ||
301 | /* Nonzero after stop if current stack frame should be printed. */ | |
302 | ||
303 | static int stop_print_frame; | |
304 | ||
305 | static struct breakpoint *step_resume_breakpoint = NULL; | |
c906108c SS |
306 | |
307 | /* On some platforms (e.g., HP-UX), hardware watchpoints have bad | |
308 | interactions with an inferior that is running a kernel function | |
309 | (aka, a system call or "syscall"). wait_for_inferior therefore | |
310 | may have a need to know when the inferior is in a syscall. This | |
311 | is a count of the number of inferior threads which are known to | |
312 | currently be running in a syscall. */ | |
313 | static int number_of_threads_in_syscalls; | |
314 | ||
e02bc4cc | 315 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
316 | returned by target_wait()/deprecated_target_wait_hook(). This |
317 | information is returned by get_last_target_status(). */ | |
39f77062 | 318 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
319 | static struct target_waitstatus target_last_waitstatus; |
320 | ||
c906108c SS |
321 | /* This is used to remember when a fork, vfork or exec event |
322 | was caught by a catchpoint, and thus the event is to be | |
323 | followed at the next resume of the inferior, and not | |
324 | immediately. */ | |
325 | static struct | |
488f131b JB |
326 | { |
327 | enum target_waitkind kind; | |
328 | struct | |
c906108c | 329 | { |
488f131b | 330 | int parent_pid; |
488f131b | 331 | int child_pid; |
c906108c | 332 | } |
488f131b JB |
333 | fork_event; |
334 | char *execd_pathname; | |
335 | } | |
c906108c SS |
336 | pending_follow; |
337 | ||
53904c9e AC |
338 | static const char follow_fork_mode_child[] = "child"; |
339 | static const char follow_fork_mode_parent[] = "parent"; | |
340 | ||
488f131b | 341 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e AC |
342 | follow_fork_mode_child, |
343 | follow_fork_mode_parent, | |
344 | NULL | |
ef346e04 | 345 | }; |
c906108c | 346 | |
53904c9e | 347 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
c906108c SS |
348 | \f |
349 | ||
6604731b | 350 | static int |
4ef3f3be | 351 | follow_fork (void) |
c906108c | 352 | { |
ea1dd7bc | 353 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
c906108c | 354 | |
6604731b | 355 | return target_follow_fork (follow_child); |
c906108c SS |
356 | } |
357 | ||
6604731b DJ |
358 | void |
359 | follow_inferior_reset_breakpoints (void) | |
c906108c | 360 | { |
6604731b DJ |
361 | /* Was there a step_resume breakpoint? (There was if the user |
362 | did a "next" at the fork() call.) If so, explicitly reset its | |
363 | thread number. | |
364 | ||
365 | step_resumes are a form of bp that are made to be per-thread. | |
366 | Since we created the step_resume bp when the parent process | |
367 | was being debugged, and now are switching to the child process, | |
368 | from the breakpoint package's viewpoint, that's a switch of | |
369 | "threads". We must update the bp's notion of which thread | |
370 | it is for, or it'll be ignored when it triggers. */ | |
371 | ||
372 | if (step_resume_breakpoint) | |
373 | breakpoint_re_set_thread (step_resume_breakpoint); | |
374 | ||
375 | /* Reinsert all breakpoints in the child. The user may have set | |
376 | breakpoints after catching the fork, in which case those | |
377 | were never set in the child, but only in the parent. This makes | |
378 | sure the inserted breakpoints match the breakpoint list. */ | |
379 | ||
380 | breakpoint_re_set (); | |
381 | insert_breakpoints (); | |
c906108c | 382 | } |
c906108c | 383 | |
1adeb98a FN |
384 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
385 | ||
c906108c | 386 | static void |
96baa820 | 387 | follow_exec (int pid, char *execd_pathname) |
c906108c | 388 | { |
c906108c | 389 | int saved_pid = pid; |
7a292a7a SS |
390 | struct target_ops *tgt; |
391 | ||
392 | if (!may_follow_exec) | |
393 | return; | |
c906108c | 394 | |
c906108c SS |
395 | /* This is an exec event that we actually wish to pay attention to. |
396 | Refresh our symbol table to the newly exec'd program, remove any | |
397 | momentary bp's, etc. | |
398 | ||
399 | If there are breakpoints, they aren't really inserted now, | |
400 | since the exec() transformed our inferior into a fresh set | |
401 | of instructions. | |
402 | ||
403 | We want to preserve symbolic breakpoints on the list, since | |
404 | we have hopes that they can be reset after the new a.out's | |
405 | symbol table is read. | |
406 | ||
407 | However, any "raw" breakpoints must be removed from the list | |
408 | (e.g., the solib bp's), since their address is probably invalid | |
409 | now. | |
410 | ||
411 | And, we DON'T want to call delete_breakpoints() here, since | |
412 | that may write the bp's "shadow contents" (the instruction | |
413 | value that was overwritten witha TRAP instruction). Since | |
414 | we now have a new a.out, those shadow contents aren't valid. */ | |
415 | update_breakpoints_after_exec (); | |
416 | ||
417 | /* If there was one, it's gone now. We cannot truly step-to-next | |
418 | statement through an exec(). */ | |
419 | step_resume_breakpoint = NULL; | |
420 | step_range_start = 0; | |
421 | step_range_end = 0; | |
422 | ||
c906108c SS |
423 | /* What is this a.out's name? */ |
424 | printf_unfiltered ("Executing new program: %s\n", execd_pathname); | |
425 | ||
426 | /* We've followed the inferior through an exec. Therefore, the | |
427 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
428 | |
429 | /* First collect the run target in effect. */ | |
430 | tgt = find_run_target (); | |
431 | /* If we can't find one, things are in a very strange state... */ | |
432 | if (tgt == NULL) | |
433 | error ("Could find run target to save before following exec"); | |
434 | ||
c906108c SS |
435 | gdb_flush (gdb_stdout); |
436 | target_mourn_inferior (); | |
39f77062 | 437 | inferior_ptid = pid_to_ptid (saved_pid); |
488f131b | 438 | /* Because mourn_inferior resets inferior_ptid. */ |
7a292a7a | 439 | push_target (tgt); |
c906108c SS |
440 | |
441 | /* That a.out is now the one to use. */ | |
442 | exec_file_attach (execd_pathname, 0); | |
443 | ||
444 | /* And also is where symbols can be found. */ | |
1adeb98a | 445 | symbol_file_add_main (execd_pathname, 0); |
c906108c SS |
446 | |
447 | /* Reset the shared library package. This ensures that we get | |
448 | a shlib event when the child reaches "_start", at which point | |
449 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 450 | #if defined(SOLIB_RESTART) |
c906108c | 451 | SOLIB_RESTART (); |
7a292a7a SS |
452 | #endif |
453 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
39f77062 | 454 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
7a292a7a | 455 | #endif |
c906108c SS |
456 | |
457 | /* Reinsert all breakpoints. (Those which were symbolic have | |
458 | been reset to the proper address in the new a.out, thanks | |
459 | to symbol_file_command...) */ | |
460 | insert_breakpoints (); | |
461 | ||
462 | /* The next resume of this inferior should bring it to the shlib | |
463 | startup breakpoints. (If the user had also set bp's on | |
464 | "main" from the old (parent) process, then they'll auto- | |
465 | matically get reset there in the new process.) */ | |
c906108c SS |
466 | } |
467 | ||
468 | /* Non-zero if we just simulating a single-step. This is needed | |
469 | because we cannot remove the breakpoints in the inferior process | |
470 | until after the `wait' in `wait_for_inferior'. */ | |
471 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
472 | |
473 | /* The thread we inserted single-step breakpoints for. */ | |
474 | static ptid_t singlestep_ptid; | |
475 | ||
476 | /* If another thread hit the singlestep breakpoint, we save the original | |
477 | thread here so that we can resume single-stepping it later. */ | |
478 | static ptid_t saved_singlestep_ptid; | |
479 | static int stepping_past_singlestep_breakpoint; | |
c906108c SS |
480 | \f |
481 | ||
482 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 483 | static void |
74b7792f | 484 | resume_cleanups (void *ignore) |
c906108c SS |
485 | { |
486 | normal_stop (); | |
487 | } | |
488 | ||
53904c9e AC |
489 | static const char schedlock_off[] = "off"; |
490 | static const char schedlock_on[] = "on"; | |
491 | static const char schedlock_step[] = "step"; | |
492 | static const char *scheduler_mode = schedlock_off; | |
488f131b | 493 | static const char *scheduler_enums[] = { |
ef346e04 AC |
494 | schedlock_off, |
495 | schedlock_on, | |
496 | schedlock_step, | |
497 | NULL | |
498 | }; | |
c906108c SS |
499 | |
500 | static void | |
96baa820 | 501 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 502 | { |
1868c04e AC |
503 | /* NOTE: cagney/2002-03-17: The add_show_from_set() function clones |
504 | the set command passed as a parameter. The clone operation will | |
505 | include (BUG?) any ``set'' command callback, if present. | |
506 | Commands like ``info set'' call all the ``show'' command | |
ce2826aa | 507 | callbacks. Unfortunately, for ``show'' commands cloned from |
1868c04e AC |
508 | ``set'', this includes callbacks belonging to ``set'' commands. |
509 | Making this worse, this only occures if add_show_from_set() is | |
510 | called after add_cmd_sfunc() (BUG?). */ | |
511 | if (cmd_type (c) == set_cmd) | |
c906108c SS |
512 | if (!target_can_lock_scheduler) |
513 | { | |
514 | scheduler_mode = schedlock_off; | |
488f131b | 515 | error ("Target '%s' cannot support this command.", target_shortname); |
c906108c SS |
516 | } |
517 | } | |
518 | ||
519 | ||
520 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
521 | wants to interrupt some lengthy single-stepping operation | |
522 | (for child processes, the SIGINT goes to the inferior, and so | |
523 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
524 | other targets, that's not true). | |
525 | ||
526 | STEP nonzero if we should step (zero to continue instead). | |
527 | SIG is the signal to give the inferior (zero for none). */ | |
528 | void | |
96baa820 | 529 | resume (int step, enum target_signal sig) |
c906108c SS |
530 | { |
531 | int should_resume = 1; | |
74b7792f | 532 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
c906108c SS |
533 | QUIT; |
534 | ||
ef5cf84e MS |
535 | /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */ |
536 | ||
c906108c | 537 | |
692590c1 MS |
538 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
539 | over an instruction that causes a page fault without triggering | |
540 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
541 | stop, because the hardware watchpoint is not triggered, but it forgets | |
542 | the step request and continues the program normally. | |
543 | Work around the problem by removing hardware watchpoints if a step is | |
544 | requested, GDB will check for a hardware watchpoint trigger after the | |
545 | step anyway. */ | |
546 | if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) | |
547 | remove_hw_watchpoints (); | |
488f131b | 548 | |
692590c1 | 549 | |
c2c6d25f JM |
550 | /* Normally, by the time we reach `resume', the breakpoints are either |
551 | removed or inserted, as appropriate. The exception is if we're sitting | |
552 | at a permanent breakpoint; we need to step over it, but permanent | |
553 | breakpoints can't be removed. So we have to test for it here. */ | |
554 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
555 | SKIP_PERMANENT_BREAKPOINT (); | |
556 | ||
b0ed3589 | 557 | if (SOFTWARE_SINGLE_STEP_P () && step) |
c906108c SS |
558 | { |
559 | /* Do it the hard way, w/temp breakpoints */ | |
c5aa993b | 560 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
c906108c SS |
561 | /* ...and don't ask hardware to do it. */ |
562 | step = 0; | |
563 | /* and do not pull these breakpoints until after a `wait' in | |
564 | `wait_for_inferior' */ | |
565 | singlestep_breakpoints_inserted_p = 1; | |
9f976b41 | 566 | singlestep_ptid = inferior_ptid; |
c906108c SS |
567 | } |
568 | ||
c906108c | 569 | /* If there were any forks/vforks/execs that were caught and are |
6604731b | 570 | now to be followed, then do so. */ |
c906108c SS |
571 | switch (pending_follow.kind) |
572 | { | |
6604731b DJ |
573 | case TARGET_WAITKIND_FORKED: |
574 | case TARGET_WAITKIND_VFORKED: | |
c906108c | 575 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
6604731b DJ |
576 | if (follow_fork ()) |
577 | should_resume = 0; | |
c906108c SS |
578 | break; |
579 | ||
6604731b | 580 | case TARGET_WAITKIND_EXECD: |
c906108c | 581 | /* follow_exec is called as soon as the exec event is seen. */ |
6604731b | 582 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
c906108c SS |
583 | break; |
584 | ||
585 | default: | |
586 | break; | |
587 | } | |
c906108c SS |
588 | |
589 | /* Install inferior's terminal modes. */ | |
590 | target_terminal_inferior (); | |
591 | ||
592 | if (should_resume) | |
593 | { | |
39f77062 | 594 | ptid_t resume_ptid; |
dfcd3bfb | 595 | |
488f131b | 596 | resume_ptid = RESUME_ALL; /* Default */ |
ef5cf84e MS |
597 | |
598 | if ((step || singlestep_breakpoints_inserted_p) && | |
9f976b41 DJ |
599 | (stepping_past_singlestep_breakpoint |
600 | || (!breakpoints_inserted && breakpoint_here_p (read_pc ())))) | |
c906108c | 601 | { |
ef5cf84e MS |
602 | /* Stepping past a breakpoint without inserting breakpoints. |
603 | Make sure only the current thread gets to step, so that | |
604 | other threads don't sneak past breakpoints while they are | |
605 | not inserted. */ | |
c906108c | 606 | |
ef5cf84e | 607 | resume_ptid = inferior_ptid; |
c906108c | 608 | } |
ef5cf84e MS |
609 | |
610 | if ((scheduler_mode == schedlock_on) || | |
488f131b | 611 | (scheduler_mode == schedlock_step && |
ef5cf84e | 612 | (step || singlestep_breakpoints_inserted_p))) |
c906108c | 613 | { |
ef5cf84e | 614 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 615 | resume_ptid = inferior_ptid; |
c906108c | 616 | } |
ef5cf84e | 617 | |
c4ed33b9 AC |
618 | if (CANNOT_STEP_BREAKPOINT) |
619 | { | |
620 | /* Most targets can step a breakpoint instruction, thus | |
621 | executing it normally. But if this one cannot, just | |
622 | continue and we will hit it anyway. */ | |
623 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
624 | step = 0; | |
625 | } | |
39f77062 | 626 | target_resume (resume_ptid, step, sig); |
c906108c SS |
627 | } |
628 | ||
629 | discard_cleanups (old_cleanups); | |
630 | } | |
631 | \f | |
632 | ||
633 | /* Clear out all variables saying what to do when inferior is continued. | |
634 | First do this, then set the ones you want, then call `proceed'. */ | |
635 | ||
636 | void | |
96baa820 | 637 | clear_proceed_status (void) |
c906108c SS |
638 | { |
639 | trap_expected = 0; | |
640 | step_range_start = 0; | |
641 | step_range_end = 0; | |
aa0cd9c1 | 642 | step_frame_id = null_frame_id; |
5fbbeb29 | 643 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c | 644 | stop_after_trap = 0; |
c0236d92 | 645 | stop_soon = NO_STOP_QUIETLY; |
c906108c SS |
646 | proceed_to_finish = 0; |
647 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
648 | ||
649 | /* Discard any remaining commands or status from previous stop. */ | |
650 | bpstat_clear (&stop_bpstat); | |
651 | } | |
652 | ||
ea67f13b DJ |
653 | /* This should be suitable for any targets that support threads. */ |
654 | ||
655 | static int | |
656 | prepare_to_proceed (void) | |
657 | { | |
658 | ptid_t wait_ptid; | |
659 | struct target_waitstatus wait_status; | |
660 | ||
661 | /* Get the last target status returned by target_wait(). */ | |
662 | get_last_target_status (&wait_ptid, &wait_status); | |
663 | ||
664 | /* Make sure we were stopped either at a breakpoint, or because | |
665 | of a Ctrl-C. */ | |
666 | if (wait_status.kind != TARGET_WAITKIND_STOPPED | |
667 | || (wait_status.value.sig != TARGET_SIGNAL_TRAP && | |
668 | wait_status.value.sig != TARGET_SIGNAL_INT)) | |
669 | { | |
670 | return 0; | |
671 | } | |
672 | ||
673 | if (!ptid_equal (wait_ptid, minus_one_ptid) | |
674 | && !ptid_equal (inferior_ptid, wait_ptid)) | |
675 | { | |
676 | /* Switched over from WAIT_PID. */ | |
677 | CORE_ADDR wait_pc = read_pc_pid (wait_ptid); | |
678 | ||
679 | if (wait_pc != read_pc ()) | |
680 | { | |
681 | /* Switch back to WAIT_PID thread. */ | |
682 | inferior_ptid = wait_ptid; | |
683 | ||
684 | /* FIXME: This stuff came from switch_to_thread() in | |
685 | thread.c (which should probably be a public function). */ | |
686 | flush_cached_frames (); | |
687 | registers_changed (); | |
688 | stop_pc = wait_pc; | |
689 | select_frame (get_current_frame ()); | |
690 | } | |
691 | ||
692 | /* We return 1 to indicate that there is a breakpoint here, | |
693 | so we need to step over it before continuing to avoid | |
694 | hitting it straight away. */ | |
695 | if (breakpoint_here_p (wait_pc)) | |
696 | return 1; | |
697 | } | |
698 | ||
699 | return 0; | |
700 | ||
701 | } | |
e4846b08 JJ |
702 | |
703 | /* Record the pc of the program the last time it stopped. This is | |
704 | just used internally by wait_for_inferior, but need to be preserved | |
705 | over calls to it and cleared when the inferior is started. */ | |
706 | static CORE_ADDR prev_pc; | |
707 | ||
c906108c SS |
708 | /* Basic routine for continuing the program in various fashions. |
709 | ||
710 | ADDR is the address to resume at, or -1 for resume where stopped. | |
711 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 712 | or -1 for act according to how it stopped. |
c906108c | 713 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
714 | -1 means return after that and print nothing. |
715 | You should probably set various step_... variables | |
716 | before calling here, if you are stepping. | |
c906108c SS |
717 | |
718 | You should call clear_proceed_status before calling proceed. */ | |
719 | ||
720 | void | |
96baa820 | 721 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
722 | { |
723 | int oneproc = 0; | |
724 | ||
725 | if (step > 0) | |
726 | step_start_function = find_pc_function (read_pc ()); | |
727 | if (step < 0) | |
728 | stop_after_trap = 1; | |
729 | ||
2acceee2 | 730 | if (addr == (CORE_ADDR) -1) |
c906108c SS |
731 | { |
732 | /* If there is a breakpoint at the address we will resume at, | |
c5aa993b JM |
733 | step one instruction before inserting breakpoints |
734 | so that we do not stop right away (and report a second | |
c906108c SS |
735 | hit at this breakpoint). */ |
736 | ||
737 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) | |
738 | oneproc = 1; | |
739 | ||
740 | #ifndef STEP_SKIPS_DELAY | |
741 | #define STEP_SKIPS_DELAY(pc) (0) | |
742 | #define STEP_SKIPS_DELAY_P (0) | |
743 | #endif | |
744 | /* Check breakpoint_here_p first, because breakpoint_here_p is fast | |
c5aa993b JM |
745 | (it just checks internal GDB data structures) and STEP_SKIPS_DELAY |
746 | is slow (it needs to read memory from the target). */ | |
c906108c SS |
747 | if (STEP_SKIPS_DELAY_P |
748 | && breakpoint_here_p (read_pc () + 4) | |
749 | && STEP_SKIPS_DELAY (read_pc ())) | |
750 | oneproc = 1; | |
751 | } | |
752 | else | |
753 | { | |
754 | write_pc (addr); | |
c906108c SS |
755 | } |
756 | ||
c906108c SS |
757 | /* In a multi-threaded task we may select another thread |
758 | and then continue or step. | |
759 | ||
760 | But if the old thread was stopped at a breakpoint, it | |
761 | will immediately cause another breakpoint stop without | |
762 | any execution (i.e. it will report a breakpoint hit | |
763 | incorrectly). So we must step over it first. | |
764 | ||
ea67f13b | 765 | prepare_to_proceed checks the current thread against the thread |
c906108c SS |
766 | that reported the most recent event. If a step-over is required |
767 | it returns TRUE and sets the current thread to the old thread. */ | |
ea67f13b DJ |
768 | if (prepare_to_proceed () && breakpoint_here_p (read_pc ())) |
769 | oneproc = 1; | |
c906108c SS |
770 | |
771 | #ifdef HP_OS_BUG | |
772 | if (trap_expected_after_continue) | |
773 | { | |
774 | /* If (step == 0), a trap will be automatically generated after | |
c5aa993b JM |
775 | the first instruction is executed. Force step one |
776 | instruction to clear this condition. This should not occur | |
777 | if step is nonzero, but it is harmless in that case. */ | |
c906108c SS |
778 | oneproc = 1; |
779 | trap_expected_after_continue = 0; | |
780 | } | |
781 | #endif /* HP_OS_BUG */ | |
782 | ||
783 | if (oneproc) | |
784 | /* We will get a trace trap after one instruction. | |
785 | Continue it automatically and insert breakpoints then. */ | |
786 | trap_expected = 1; | |
787 | else | |
788 | { | |
81d0cc19 GS |
789 | insert_breakpoints (); |
790 | /* If we get here there was no call to error() in | |
791 | insert breakpoints -- so they were inserted. */ | |
c906108c SS |
792 | breakpoints_inserted = 1; |
793 | } | |
794 | ||
795 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
796 | stop_signal = siggnal; | |
797 | /* If this signal should not be seen by program, | |
798 | give it zero. Used for debugging signals. */ | |
799 | else if (!signal_program[stop_signal]) | |
800 | stop_signal = TARGET_SIGNAL_0; | |
801 | ||
802 | annotate_starting (); | |
803 | ||
804 | /* Make sure that output from GDB appears before output from the | |
805 | inferior. */ | |
806 | gdb_flush (gdb_stdout); | |
807 | ||
e4846b08 JJ |
808 | /* Refresh prev_pc value just prior to resuming. This used to be |
809 | done in stop_stepping, however, setting prev_pc there did not handle | |
810 | scenarios such as inferior function calls or returning from | |
811 | a function via the return command. In those cases, the prev_pc | |
812 | value was not set properly for subsequent commands. The prev_pc value | |
813 | is used to initialize the starting line number in the ecs. With an | |
814 | invalid value, the gdb next command ends up stopping at the position | |
815 | represented by the next line table entry past our start position. | |
816 | On platforms that generate one line table entry per line, this | |
817 | is not a problem. However, on the ia64, the compiler generates | |
818 | extraneous line table entries that do not increase the line number. | |
819 | When we issue the gdb next command on the ia64 after an inferior call | |
820 | or a return command, we often end up a few instructions forward, still | |
821 | within the original line we started. | |
822 | ||
823 | An attempt was made to have init_execution_control_state () refresh | |
824 | the prev_pc value before calculating the line number. This approach | |
825 | did not work because on platforms that use ptrace, the pc register | |
826 | cannot be read unless the inferior is stopped. At that point, we | |
827 | are not guaranteed the inferior is stopped and so the read_pc () | |
828 | call can fail. Setting the prev_pc value here ensures the value is | |
829 | updated correctly when the inferior is stopped. */ | |
830 | prev_pc = read_pc (); | |
831 | ||
c906108c SS |
832 | /* Resume inferior. */ |
833 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
834 | ||
835 | /* Wait for it to stop (if not standalone) | |
836 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
837 | /* Do this only if we are not using the event loop, or if the target |
838 | does not support asynchronous execution. */ | |
6426a772 | 839 | if (!event_loop_p || !target_can_async_p ()) |
43ff13b4 JM |
840 | { |
841 | wait_for_inferior (); | |
842 | normal_stop (); | |
843 | } | |
c906108c | 844 | } |
c906108c SS |
845 | \f |
846 | ||
847 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 848 | |
c906108c | 849 | void |
96baa820 | 850 | start_remote (void) |
c906108c SS |
851 | { |
852 | init_thread_list (); | |
853 | init_wait_for_inferior (); | |
c0236d92 | 854 | stop_soon = STOP_QUIETLY; |
c906108c | 855 | trap_expected = 0; |
43ff13b4 | 856 | |
6426a772 JM |
857 | /* Always go on waiting for the target, regardless of the mode. */ |
858 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 859 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
860 | nothing is returned (instead of just blocking). Because of this, |
861 | targets expecting an immediate response need to, internally, set | |
862 | things up so that the target_wait() is forced to eventually | |
863 | timeout. */ | |
864 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
865 | differentiate to its caller what the state of the target is after | |
866 | the initial open has been performed. Here we're assuming that | |
867 | the target has stopped. It should be possible to eventually have | |
868 | target_open() return to the caller an indication that the target | |
869 | is currently running and GDB state should be set to the same as | |
870 | for an async run. */ | |
871 | wait_for_inferior (); | |
872 | normal_stop (); | |
c906108c SS |
873 | } |
874 | ||
875 | /* Initialize static vars when a new inferior begins. */ | |
876 | ||
877 | void | |
96baa820 | 878 | init_wait_for_inferior (void) |
c906108c SS |
879 | { |
880 | /* These are meaningless until the first time through wait_for_inferior. */ | |
881 | prev_pc = 0; | |
c906108c SS |
882 | |
883 | #ifdef HP_OS_BUG | |
884 | trap_expected_after_continue = 0; | |
885 | #endif | |
886 | breakpoints_inserted = 0; | |
887 | breakpoint_init_inferior (inf_starting); | |
888 | ||
889 | /* Don't confuse first call to proceed(). */ | |
890 | stop_signal = TARGET_SIGNAL_0; | |
891 | ||
892 | /* The first resume is not following a fork/vfork/exec. */ | |
893 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
c906108c SS |
894 | |
895 | /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ | |
896 | number_of_threads_in_syscalls = 0; | |
897 | ||
898 | clear_proceed_status (); | |
9f976b41 DJ |
899 | |
900 | stepping_past_singlestep_breakpoint = 0; | |
c906108c | 901 | } |
c906108c | 902 | \f |
b83266a0 SS |
903 | /* This enum encodes possible reasons for doing a target_wait, so that |
904 | wfi can call target_wait in one place. (Ultimately the call will be | |
905 | moved out of the infinite loop entirely.) */ | |
906 | ||
c5aa993b JM |
907 | enum infwait_states |
908 | { | |
cd0fc7c3 SS |
909 | infwait_normal_state, |
910 | infwait_thread_hop_state, | |
911 | infwait_nullified_state, | |
912 | infwait_nonstep_watch_state | |
b83266a0 SS |
913 | }; |
914 | ||
11cf8741 JM |
915 | /* Why did the inferior stop? Used to print the appropriate messages |
916 | to the interface from within handle_inferior_event(). */ | |
917 | enum inferior_stop_reason | |
918 | { | |
919 | /* We don't know why. */ | |
920 | STOP_UNKNOWN, | |
921 | /* Step, next, nexti, stepi finished. */ | |
922 | END_STEPPING_RANGE, | |
923 | /* Found breakpoint. */ | |
924 | BREAKPOINT_HIT, | |
925 | /* Inferior terminated by signal. */ | |
926 | SIGNAL_EXITED, | |
927 | /* Inferior exited. */ | |
928 | EXITED, | |
929 | /* Inferior received signal, and user asked to be notified. */ | |
930 | SIGNAL_RECEIVED | |
931 | }; | |
932 | ||
cd0fc7c3 SS |
933 | /* This structure contains what used to be local variables in |
934 | wait_for_inferior. Probably many of them can return to being | |
935 | locals in handle_inferior_event. */ | |
936 | ||
c5aa993b | 937 | struct execution_control_state |
488f131b JB |
938 | { |
939 | struct target_waitstatus ws; | |
940 | struct target_waitstatus *wp; | |
941 | int another_trap; | |
942 | int random_signal; | |
943 | CORE_ADDR stop_func_start; | |
944 | CORE_ADDR stop_func_end; | |
945 | char *stop_func_name; | |
946 | struct symtab_and_line sal; | |
947 | int remove_breakpoints_on_following_step; | |
948 | int current_line; | |
949 | struct symtab *current_symtab; | |
950 | int handling_longjmp; /* FIXME */ | |
951 | ptid_t ptid; | |
952 | ptid_t saved_inferior_ptid; | |
953 | int update_step_sp; | |
954 | int stepping_through_solib_after_catch; | |
955 | bpstat stepping_through_solib_catchpoints; | |
956 | int enable_hw_watchpoints_after_wait; | |
957 | int stepping_through_sigtramp; | |
958 | int new_thread_event; | |
959 | struct target_waitstatus tmpstatus; | |
960 | enum infwait_states infwait_state; | |
961 | ptid_t waiton_ptid; | |
962 | int wait_some_more; | |
963 | }; | |
964 | ||
965 | void init_execution_control_state (struct execution_control_state *ecs); | |
966 | ||
1af510a8 | 967 | static void handle_step_into_function (struct execution_control_state *ecs); |
488f131b | 968 | void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 969 | |
c2c6d25f | 970 | static void step_into_function (struct execution_control_state *ecs); |
d4f3574e | 971 | static void step_over_function (struct execution_control_state *ecs); |
d303a6c7 AC |
972 | static void insert_step_resume_breakpoint (struct frame_info *step_frame, |
973 | struct execution_control_state *ecs); | |
104c1213 JM |
974 | static void stop_stepping (struct execution_control_state *ecs); |
975 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 976 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
977 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
978 | int stop_info); | |
104c1213 | 979 | |
cd0fc7c3 SS |
980 | /* Wait for control to return from inferior to debugger. |
981 | If inferior gets a signal, we may decide to start it up again | |
982 | instead of returning. That is why there is a loop in this function. | |
983 | When this function actually returns it means the inferior | |
984 | should be left stopped and GDB should read more commands. */ | |
985 | ||
986 | void | |
96baa820 | 987 | wait_for_inferior (void) |
cd0fc7c3 SS |
988 | { |
989 | struct cleanup *old_cleanups; | |
990 | struct execution_control_state ecss; | |
991 | struct execution_control_state *ecs; | |
c906108c | 992 | |
8601f500 | 993 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c | 994 | &step_resume_breakpoint); |
cd0fc7c3 SS |
995 | |
996 | /* wfi still stays in a loop, so it's OK just to take the address of | |
997 | a local to get the ecs pointer. */ | |
998 | ecs = &ecss; | |
999 | ||
1000 | /* Fill in with reasonable starting values. */ | |
1001 | init_execution_control_state (ecs); | |
1002 | ||
c906108c | 1003 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1004 | previous_inferior_ptid = inferior_ptid; |
c906108c | 1005 | |
cd0fc7c3 SS |
1006 | overlay_cache_invalid = 1; |
1007 | ||
1008 | /* We have to invalidate the registers BEFORE calling target_wait | |
1009 | because they can be loaded from the target while in target_wait. | |
1010 | This makes remote debugging a bit more efficient for those | |
1011 | targets that provide critical registers as part of their normal | |
1012 | status mechanism. */ | |
1013 | ||
1014 | registers_changed (); | |
b83266a0 | 1015 | |
c906108c SS |
1016 | while (1) |
1017 | { | |
9a4105ab AC |
1018 | if (deprecated_target_wait_hook) |
1019 | ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp); | |
cd0fc7c3 | 1020 | else |
39f77062 | 1021 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
c906108c | 1022 | |
cd0fc7c3 SS |
1023 | /* Now figure out what to do with the result of the result. */ |
1024 | handle_inferior_event (ecs); | |
c906108c | 1025 | |
cd0fc7c3 SS |
1026 | if (!ecs->wait_some_more) |
1027 | break; | |
1028 | } | |
1029 | do_cleanups (old_cleanups); | |
1030 | } | |
c906108c | 1031 | |
43ff13b4 JM |
1032 | /* Asynchronous version of wait_for_inferior. It is called by the |
1033 | event loop whenever a change of state is detected on the file | |
1034 | descriptor corresponding to the target. It can be called more than | |
1035 | once to complete a single execution command. In such cases we need | |
1036 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1037 | last time that this function is called for a single execution | |
1038 | command, then report to the user that the inferior has stopped, and | |
1039 | do the necessary cleanups. */ | |
1040 | ||
1041 | struct execution_control_state async_ecss; | |
1042 | struct execution_control_state *async_ecs; | |
1043 | ||
1044 | void | |
fba45db2 | 1045 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1046 | { |
1047 | static struct cleanup *old_cleanups; | |
1048 | ||
c5aa993b | 1049 | async_ecs = &async_ecss; |
43ff13b4 JM |
1050 | |
1051 | if (!async_ecs->wait_some_more) | |
1052 | { | |
488f131b | 1053 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
c5aa993b | 1054 | &step_resume_breakpoint); |
43ff13b4 JM |
1055 | |
1056 | /* Fill in with reasonable starting values. */ | |
1057 | init_execution_control_state (async_ecs); | |
1058 | ||
43ff13b4 | 1059 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1060 | previous_inferior_ptid = inferior_ptid; |
43ff13b4 JM |
1061 | |
1062 | overlay_cache_invalid = 1; | |
1063 | ||
1064 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1065 | because they can be loaded from the target while in target_wait. |
1066 | This makes remote debugging a bit more efficient for those | |
1067 | targets that provide critical registers as part of their normal | |
1068 | status mechanism. */ | |
43ff13b4 JM |
1069 | |
1070 | registers_changed (); | |
1071 | } | |
1072 | ||
9a4105ab | 1073 | if (deprecated_target_wait_hook) |
488f131b | 1074 | async_ecs->ptid = |
9a4105ab | 1075 | deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 | 1076 | else |
39f77062 | 1077 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 JM |
1078 | |
1079 | /* Now figure out what to do with the result of the result. */ | |
1080 | handle_inferior_event (async_ecs); | |
1081 | ||
1082 | if (!async_ecs->wait_some_more) | |
1083 | { | |
adf40b2e | 1084 | /* Do only the cleanups that have been added by this |
488f131b JB |
1085 | function. Let the continuations for the commands do the rest, |
1086 | if there are any. */ | |
43ff13b4 JM |
1087 | do_exec_cleanups (old_cleanups); |
1088 | normal_stop (); | |
c2d11a7d JM |
1089 | if (step_multi && stop_step) |
1090 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1091 | else | |
1092 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1093 | } |
1094 | } | |
1095 | ||
cd0fc7c3 SS |
1096 | /* Prepare an execution control state for looping through a |
1097 | wait_for_inferior-type loop. */ | |
1098 | ||
1099 | void | |
96baa820 | 1100 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1101 | { |
c2d11a7d | 1102 | /* ecs->another_trap? */ |
cd0fc7c3 SS |
1103 | ecs->random_signal = 0; |
1104 | ecs->remove_breakpoints_on_following_step = 0; | |
1105 | ecs->handling_longjmp = 0; /* FIXME */ | |
1106 | ecs->update_step_sp = 0; | |
1107 | ecs->stepping_through_solib_after_catch = 0; | |
1108 | ecs->stepping_through_solib_catchpoints = NULL; | |
1109 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1110 | ecs->stepping_through_sigtramp = 0; | |
1111 | ecs->sal = find_pc_line (prev_pc, 0); | |
1112 | ecs->current_line = ecs->sal.line; | |
1113 | ecs->current_symtab = ecs->sal.symtab; | |
1114 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1115 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1116 | ecs->wp = &(ecs->ws); |
1117 | } | |
1118 | ||
a0b3c4fd | 1119 | /* Call this function before setting step_resume_breakpoint, as a |
53a5351d JM |
1120 | sanity check. There should never be more than one step-resume |
1121 | breakpoint per thread, so we should never be setting a new | |
1122 | step_resume_breakpoint when one is already active. */ | |
a0b3c4fd | 1123 | static void |
96baa820 | 1124 | check_for_old_step_resume_breakpoint (void) |
a0b3c4fd JM |
1125 | { |
1126 | if (step_resume_breakpoint) | |
488f131b JB |
1127 | warning |
1128 | ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint"); | |
a0b3c4fd JM |
1129 | } |
1130 | ||
e02bc4cc | 1131 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
1132 | target_wait()/deprecated_target_wait_hook(). The data is actually |
1133 | cached by handle_inferior_event(), which gets called immediately | |
1134 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
1135 | |
1136 | void | |
488f131b | 1137 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1138 | { |
39f77062 | 1139 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1140 | *status = target_last_waitstatus; |
1141 | } | |
1142 | ||
dd80620e MS |
1143 | /* Switch thread contexts, maintaining "infrun state". */ |
1144 | ||
1145 | static void | |
1146 | context_switch (struct execution_control_state *ecs) | |
1147 | { | |
1148 | /* Caution: it may happen that the new thread (or the old one!) | |
1149 | is not in the thread list. In this case we must not attempt | |
1150 | to "switch context", or we run the risk that our context may | |
1151 | be lost. This may happen as a result of the target module | |
1152 | mishandling thread creation. */ | |
1153 | ||
1154 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) | |
488f131b | 1155 | { /* Perform infrun state context switch: */ |
dd80620e | 1156 | /* Save infrun state for the old thread. */ |
0ce3d317 | 1157 | save_infrun_state (inferior_ptid, prev_pc, |
dd80620e | 1158 | trap_expected, step_resume_breakpoint, |
15960608 | 1159 | step_range_start, |
aa0cd9c1 | 1160 | step_range_end, &step_frame_id, |
dd80620e MS |
1161 | ecs->handling_longjmp, ecs->another_trap, |
1162 | ecs->stepping_through_solib_after_catch, | |
1163 | ecs->stepping_through_solib_catchpoints, | |
1164 | ecs->stepping_through_sigtramp, | |
488f131b | 1165 | ecs->current_line, ecs->current_symtab, step_sp); |
dd80620e MS |
1166 | |
1167 | /* Load infrun state for the new thread. */ | |
0ce3d317 | 1168 | load_infrun_state (ecs->ptid, &prev_pc, |
dd80620e | 1169 | &trap_expected, &step_resume_breakpoint, |
15960608 | 1170 | &step_range_start, |
aa0cd9c1 | 1171 | &step_range_end, &step_frame_id, |
dd80620e MS |
1172 | &ecs->handling_longjmp, &ecs->another_trap, |
1173 | &ecs->stepping_through_solib_after_catch, | |
1174 | &ecs->stepping_through_solib_catchpoints, | |
488f131b JB |
1175 | &ecs->stepping_through_sigtramp, |
1176 | &ecs->current_line, &ecs->current_symtab, &step_sp); | |
dd80620e MS |
1177 | } |
1178 | inferior_ptid = ecs->ptid; | |
1179 | } | |
1180 | ||
1af510a8 JB |
1181 | /* Handle the inferior event in the cases when we just stepped |
1182 | into a function. */ | |
1183 | ||
1184 | static void | |
1185 | handle_step_into_function (struct execution_control_state *ecs) | |
1186 | { | |
1187 | CORE_ADDR real_stop_pc; | |
1188 | ||
1189 | if ((step_over_calls == STEP_OVER_NONE) | |
1190 | || ((step_range_end == 1) | |
1191 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
1192 | { | |
1193 | /* I presume that step_over_calls is only 0 when we're | |
1194 | supposed to be stepping at the assembly language level | |
1195 | ("stepi"). Just stop. */ | |
1196 | /* Also, maybe we just did a "nexti" inside a prolog, | |
1197 | so we thought it was a subroutine call but it was not. | |
1198 | Stop as well. FENN */ | |
1199 | stop_step = 1; | |
1200 | print_stop_reason (END_STEPPING_RANGE, 0); | |
1201 | stop_stepping (ecs); | |
1202 | return; | |
1203 | } | |
1204 | ||
1205 | if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc)) | |
1206 | { | |
1207 | /* We're doing a "next". */ | |
1af510a8 JB |
1208 | step_over_function (ecs); |
1209 | keep_going (ecs); | |
1210 | return; | |
1211 | } | |
1212 | ||
1213 | /* If we are in a function call trampoline (a stub between | |
1214 | the calling routine and the real function), locate the real | |
1215 | function. That's what tells us (a) whether we want to step | |
1216 | into it at all, and (b) what prologue we want to run to | |
1217 | the end of, if we do step into it. */ | |
1218 | real_stop_pc = skip_language_trampoline (stop_pc); | |
1219 | if (real_stop_pc == 0) | |
1220 | real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); | |
1221 | if (real_stop_pc != 0) | |
1222 | ecs->stop_func_start = real_stop_pc; | |
1223 | ||
1224 | /* If we have line number information for the function we | |
1225 | are thinking of stepping into, step into it. | |
1226 | ||
1227 | If there are several symtabs at that PC (e.g. with include | |
1228 | files), just want to know whether *any* of them have line | |
1229 | numbers. find_pc_line handles this. */ | |
1230 | { | |
1231 | struct symtab_and_line tmp_sal; | |
1232 | ||
1233 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); | |
1234 | if (tmp_sal.line != 0) | |
1235 | { | |
1236 | step_into_function (ecs); | |
1237 | return; | |
1238 | } | |
1239 | } | |
1240 | ||
1241 | /* If we have no line number and the step-stop-if-no-debug | |
1242 | is set, we stop the step so that the user has a chance to | |
1243 | switch in assembly mode. */ | |
1244 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) | |
1245 | { | |
1246 | stop_step = 1; | |
1247 | print_stop_reason (END_STEPPING_RANGE, 0); | |
1248 | stop_stepping (ecs); | |
1249 | return; | |
1250 | } | |
1251 | ||
1252 | step_over_function (ecs); | |
1253 | keep_going (ecs); | |
1254 | return; | |
1255 | } | |
dd80620e | 1256 | |
4fa8626c DJ |
1257 | static void |
1258 | adjust_pc_after_break (struct execution_control_state *ecs) | |
1259 | { | |
1260 | CORE_ADDR stop_pc; | |
1261 | ||
1262 | /* If this target does not decrement the PC after breakpoints, then | |
1263 | we have nothing to do. */ | |
1264 | if (DECR_PC_AFTER_BREAK == 0) | |
1265 | return; | |
1266 | ||
1267 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If | |
1268 | we aren't, just return. | |
9709f61c DJ |
1269 | |
1270 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
1271 | affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented | |
1272 | by software breakpoints should be handled through the normal breakpoint | |
1273 | layer. | |
4fa8626c DJ |
1274 | |
1275 | NOTE drow/2004-01-31: On some targets, breakpoints may generate | |
1276 | different signals (SIGILL or SIGEMT for instance), but it is less | |
1277 | clear where the PC is pointing afterwards. It may not match | |
1278 | DECR_PC_AFTER_BREAK. I don't know any specific target that generates | |
1279 | these signals at breakpoints (the code has been in GDB since at least | |
1280 | 1992) so I can not guess how to handle them here. | |
1281 | ||
1282 | In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS | |
1283 | would have the PC after hitting a watchpoint affected by | |
1284 | DECR_PC_AFTER_BREAK. I haven't found any target with both of these set | |
1285 | in GDB history, and it seems unlikely to be correct, so | |
1286 | HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */ | |
1287 | ||
1288 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
1289 | return; | |
1290 | ||
1291 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
1292 | return; | |
1293 | ||
1294 | /* Find the location where (if we've hit a breakpoint) the breakpoint would | |
1295 | be. */ | |
1296 | stop_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK; | |
1297 | ||
1298 | /* If we're software-single-stepping, then assume this is a breakpoint. | |
1299 | NOTE drow/2004-01-17: This doesn't check that the PC matches, or that | |
1300 | we're even in the right thread. The software-single-step code needs | |
1301 | some modernization. | |
1302 | ||
1303 | If we're not software-single-stepping, then we first check that there | |
1304 | is an enabled software breakpoint at this address. If there is, and | |
1305 | we weren't using hardware-single-step, then we've hit the breakpoint. | |
1306 | ||
1307 | If we were using hardware-single-step, we check prev_pc; if we just | |
1308 | stepped over an inserted software breakpoint, then we should decrement | |
1309 | the PC and eventually report hitting the breakpoint. The prev_pc check | |
1310 | prevents us from decrementing the PC if we just stepped over a jump | |
1311 | instruction and landed on the instruction after a breakpoint. | |
1312 | ||
1313 | The last bit checks that we didn't hit a breakpoint in a signal handler | |
1314 | without an intervening stop in sigtramp, which is detected by a new | |
1315 | stack pointer value below any usual function calling stack adjustments. | |
1316 | ||
1317 | NOTE drow/2004-01-17: I'm not sure that this is necessary. The check | |
1318 | predates checking for software single step at the same time. Also, | |
1319 | if we've moved into a signal handler we should have seen the | |
1320 | signal. */ | |
1321 | ||
1322 | if ((SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
1323 | || (software_breakpoint_inserted_here_p (stop_pc) | |
1324 | && !(currently_stepping (ecs) | |
1325 | && prev_pc != stop_pc | |
1326 | && !(step_range_end && INNER_THAN (read_sp (), (step_sp - 16)))))) | |
1327 | write_pc_pid (stop_pc, ecs->ptid); | |
1328 | } | |
1329 | ||
cd0fc7c3 SS |
1330 | /* Given an execution control state that has been freshly filled in |
1331 | by an event from the inferior, figure out what it means and take | |
1332 | appropriate action. */ | |
c906108c | 1333 | |
7270d8f2 OF |
1334 | int stepped_after_stopped_by_watchpoint; |
1335 | ||
cd0fc7c3 | 1336 | void |
96baa820 | 1337 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 1338 | { |
65e82032 AC |
1339 | /* NOTE: cagney/2003-03-28: If you're looking at this code and |
1340 | thinking that the variable stepped_after_stopped_by_watchpoint | |
1341 | isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT, | |
1342 | defined in the file "config/pa/nm-hppah.h", accesses the variable | |
1343 | indirectly. Mutter something rude about the HP merge. */ | |
c8edd8b4 | 1344 | int sw_single_step_trap_p = 0; |
cd0fc7c3 | 1345 | |
e02bc4cc | 1346 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1347 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1348 | target_last_waitstatus = *ecs->wp; |
1349 | ||
4fa8626c DJ |
1350 | adjust_pc_after_break (ecs); |
1351 | ||
488f131b JB |
1352 | switch (ecs->infwait_state) |
1353 | { | |
1354 | case infwait_thread_hop_state: | |
1355 | /* Cancel the waiton_ptid. */ | |
1356 | ecs->waiton_ptid = pid_to_ptid (-1); | |
65e82032 AC |
1357 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event |
1358 | is serviced in this loop, below. */ | |
1359 | if (ecs->enable_hw_watchpoints_after_wait) | |
1360 | { | |
1361 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1362 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1363 | } | |
1364 | stepped_after_stopped_by_watchpoint = 0; | |
1365 | break; | |
b83266a0 | 1366 | |
488f131b JB |
1367 | case infwait_normal_state: |
1368 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event | |
1369 | is serviced in this loop, below. */ | |
1370 | if (ecs->enable_hw_watchpoints_after_wait) | |
1371 | { | |
1372 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1373 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1374 | } | |
1375 | stepped_after_stopped_by_watchpoint = 0; | |
1376 | break; | |
b83266a0 | 1377 | |
488f131b | 1378 | case infwait_nullified_state: |
65e82032 | 1379 | stepped_after_stopped_by_watchpoint = 0; |
488f131b | 1380 | break; |
b83266a0 | 1381 | |
488f131b JB |
1382 | case infwait_nonstep_watch_state: |
1383 | insert_breakpoints (); | |
c906108c | 1384 | |
488f131b JB |
1385 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1386 | handle things like signals arriving and other things happening | |
1387 | in combination correctly? */ | |
1388 | stepped_after_stopped_by_watchpoint = 1; | |
1389 | break; | |
65e82032 AC |
1390 | |
1391 | default: | |
1392 | internal_error (__FILE__, __LINE__, "bad switch"); | |
488f131b JB |
1393 | } |
1394 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1395 | |
488f131b | 1396 | flush_cached_frames (); |
c906108c | 1397 | |
488f131b | 1398 | /* If it's a new process, add it to the thread database */ |
c906108c | 1399 | |
488f131b JB |
1400 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
1401 | && !in_thread_list (ecs->ptid)); | |
1402 | ||
1403 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1404 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1405 | { | |
1406 | add_thread (ecs->ptid); | |
c906108c | 1407 | |
488f131b JB |
1408 | ui_out_text (uiout, "[New "); |
1409 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); | |
1410 | ui_out_text (uiout, "]\n"); | |
c906108c SS |
1411 | |
1412 | #if 0 | |
488f131b JB |
1413 | /* NOTE: This block is ONLY meant to be invoked in case of a |
1414 | "thread creation event"! If it is invoked for any other | |
1415 | sort of event (such as a new thread landing on a breakpoint), | |
1416 | the event will be discarded, which is almost certainly | |
1417 | a bad thing! | |
1418 | ||
1419 | To avoid this, the low-level module (eg. target_wait) | |
1420 | should call in_thread_list and add_thread, so that the | |
1421 | new thread is known by the time we get here. */ | |
1422 | ||
1423 | /* We may want to consider not doing a resume here in order | |
1424 | to give the user a chance to play with the new thread. | |
1425 | It might be good to make that a user-settable option. */ | |
1426 | ||
1427 | /* At this point, all threads are stopped (happens | |
1428 | automatically in either the OS or the native code). | |
1429 | Therefore we need to continue all threads in order to | |
1430 | make progress. */ | |
1431 | ||
1432 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1433 | prepare_to_wait (ecs); | |
1434 | return; | |
c906108c | 1435 | #endif |
488f131b | 1436 | } |
c906108c | 1437 | |
488f131b JB |
1438 | switch (ecs->ws.kind) |
1439 | { | |
1440 | case TARGET_WAITKIND_LOADED: | |
1441 | /* Ignore gracefully during startup of the inferior, as it | |
1442 | might be the shell which has just loaded some objects, | |
1443 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1444 | #ifdef SOLIB_ADD |
c0236d92 | 1445 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b JB |
1446 | { |
1447 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1448 | breakpoint addresses via breakpoint_re_set. */ | |
1449 | if (breakpoints_inserted) | |
1450 | remove_breakpoints (); | |
c906108c | 1451 | |
488f131b JB |
1452 | /* Check for any newly added shared libraries if we're |
1453 | supposed to be adding them automatically. Switch | |
1454 | terminal for any messages produced by | |
1455 | breakpoint_re_set. */ | |
1456 | target_terminal_ours_for_output (); | |
aff6338a AC |
1457 | /* NOTE: cagney/2003-11-25: Make certain that the target |
1458 | stack's section table is kept up-to-date. Architectures, | |
1459 | (e.g., PPC64), use the section table to perform | |
1460 | operations such as address => section name and hence | |
1461 | require the table to contain all sections (including | |
1462 | those found in shared libraries). */ | |
1463 | /* NOTE: cagney/2003-11-25: Pass current_target and not | |
1464 | exec_ops to SOLIB_ADD. This is because current GDB is | |
1465 | only tooled to propagate section_table changes out from | |
1466 | the "current_target" (see target_resize_to_sections), and | |
1467 | not up from the exec stratum. This, of course, isn't | |
1468 | right. "infrun.c" should only interact with the | |
1469 | exec/process stratum, instead relying on the target stack | |
1470 | to propagate relevant changes (stop, section table | |
1471 | changed, ...) up to other layers. */ | |
1472 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); | |
488f131b JB |
1473 | target_terminal_inferior (); |
1474 | ||
1475 | /* Reinsert breakpoints and continue. */ | |
1476 | if (breakpoints_inserted) | |
1477 | insert_breakpoints (); | |
1478 | } | |
c906108c | 1479 | #endif |
488f131b JB |
1480 | resume (0, TARGET_SIGNAL_0); |
1481 | prepare_to_wait (ecs); | |
1482 | return; | |
c5aa993b | 1483 | |
488f131b JB |
1484 | case TARGET_WAITKIND_SPURIOUS: |
1485 | resume (0, TARGET_SIGNAL_0); | |
1486 | prepare_to_wait (ecs); | |
1487 | return; | |
c5aa993b | 1488 | |
488f131b JB |
1489 | case TARGET_WAITKIND_EXITED: |
1490 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
1491 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
1492 | ||
1493 | /* Record the exit code in the convenience variable $_exitcode, so | |
1494 | that the user can inspect this again later. */ | |
1495 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1496 | value_from_longest (builtin_type_int, | |
1497 | (LONGEST) ecs->ws.value.integer)); | |
1498 | gdb_flush (gdb_stdout); | |
1499 | target_mourn_inferior (); | |
1500 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1501 | stop_print_frame = 0; | |
1502 | stop_stepping (ecs); | |
1503 | return; | |
c5aa993b | 1504 | |
488f131b JB |
1505 | case TARGET_WAITKIND_SIGNALLED: |
1506 | stop_print_frame = 0; | |
1507 | stop_signal = ecs->ws.value.sig; | |
1508 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1509 | |
488f131b JB |
1510 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1511 | reach here unless the inferior is dead. However, for years | |
1512 | target_kill() was called here, which hints that fatal signals aren't | |
1513 | really fatal on some systems. If that's true, then some changes | |
1514 | may be needed. */ | |
1515 | target_mourn_inferior (); | |
c906108c | 1516 | |
488f131b JB |
1517 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
1518 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1519 | stop_stepping (ecs); | |
1520 | return; | |
c906108c | 1521 | |
488f131b JB |
1522 | /* The following are the only cases in which we keep going; |
1523 | the above cases end in a continue or goto. */ | |
1524 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 1525 | case TARGET_WAITKIND_VFORKED: |
488f131b JB |
1526 | stop_signal = TARGET_SIGNAL_TRAP; |
1527 | pending_follow.kind = ecs->ws.kind; | |
1528 | ||
8e7d2c16 DJ |
1529 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
1530 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c | 1531 | |
488f131b | 1532 | stop_pc = read_pc (); |
675bf4cb | 1533 | |
fa5281d0 | 1534 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid); |
675bf4cb | 1535 | |
488f131b | 1536 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
04e68871 DJ |
1537 | |
1538 | /* If no catchpoint triggered for this, then keep going. */ | |
1539 | if (ecs->random_signal) | |
1540 | { | |
1541 | stop_signal = TARGET_SIGNAL_0; | |
1542 | keep_going (ecs); | |
1543 | return; | |
1544 | } | |
488f131b JB |
1545 | goto process_event_stop_test; |
1546 | ||
1547 | case TARGET_WAITKIND_EXECD: | |
1548 | stop_signal = TARGET_SIGNAL_TRAP; | |
1549 | ||
7d2830a3 DJ |
1550 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
1551 | target_wait function. Until then following vfork on HP/UX 10.20 | |
1552 | is probably broken by this. Of course, it's broken anyway. */ | |
488f131b JB |
1553 | /* Is this a target which reports multiple exec events per actual |
1554 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1555 | ignore all but the last one. Just resume the exec'r, and wait | |
1556 | for the next exec event. */ | |
1557 | if (inferior_ignoring_leading_exec_events) | |
1558 | { | |
1559 | inferior_ignoring_leading_exec_events--; | |
1560 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1561 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event. | |
1562 | parent_pid); | |
1563 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); | |
1564 | prepare_to_wait (ecs); | |
1565 | return; | |
1566 | } | |
1567 | inferior_ignoring_leading_exec_events = | |
1568 | target_reported_exec_events_per_exec_call () - 1; | |
1569 | ||
1570 | pending_follow.execd_pathname = | |
1571 | savestring (ecs->ws.value.execd_pathname, | |
1572 | strlen (ecs->ws.value.execd_pathname)); | |
1573 | ||
488f131b JB |
1574 | /* This causes the eventpoints and symbol table to be reset. Must |
1575 | do this now, before trying to determine whether to stop. */ | |
1576 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); | |
1577 | xfree (pending_follow.execd_pathname); | |
c906108c | 1578 | |
488f131b JB |
1579 | stop_pc = read_pc_pid (ecs->ptid); |
1580 | ecs->saved_inferior_ptid = inferior_ptid; | |
1581 | inferior_ptid = ecs->ptid; | |
675bf4cb | 1582 | |
fa5281d0 | 1583 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid); |
675bf4cb | 1584 | |
488f131b JB |
1585 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1586 | inferior_ptid = ecs->saved_inferior_ptid; | |
04e68871 DJ |
1587 | |
1588 | /* If no catchpoint triggered for this, then keep going. */ | |
1589 | if (ecs->random_signal) | |
1590 | { | |
1591 | stop_signal = TARGET_SIGNAL_0; | |
1592 | keep_going (ecs); | |
1593 | return; | |
1594 | } | |
488f131b JB |
1595 | goto process_event_stop_test; |
1596 | ||
1597 | /* These syscall events are returned on HP-UX, as part of its | |
1598 | implementation of page-protection-based "hardware" watchpoints. | |
1599 | HP-UX has unfortunate interactions between page-protections and | |
1600 | some system calls. Our solution is to disable hardware watches | |
1601 | when a system call is entered, and reenable them when the syscall | |
1602 | completes. The downside of this is that we may miss the precise | |
1603 | point at which a watched piece of memory is modified. "Oh well." | |
1604 | ||
1605 | Note that we may have multiple threads running, which may each | |
1606 | enter syscalls at roughly the same time. Since we don't have a | |
1607 | good notion currently of whether a watched piece of memory is | |
1608 | thread-private, we'd best not have any page-protections active | |
1609 | when any thread is in a syscall. Thus, we only want to reenable | |
1610 | hardware watches when no threads are in a syscall. | |
1611 | ||
1612 | Also, be careful not to try to gather much state about a thread | |
1613 | that's in a syscall. It's frequently a losing proposition. */ | |
1614 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
1615 | number_of_threads_in_syscalls++; | |
1616 | if (number_of_threads_in_syscalls == 1) | |
1617 | { | |
1618 | TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1619 | } | |
1620 | resume (0, TARGET_SIGNAL_0); | |
1621 | prepare_to_wait (ecs); | |
1622 | return; | |
c906108c | 1623 | |
488f131b JB |
1624 | /* Before examining the threads further, step this thread to |
1625 | get it entirely out of the syscall. (We get notice of the | |
1626 | event when the thread is just on the verge of exiting a | |
1627 | syscall. Stepping one instruction seems to get it back | |
1628 | into user code.) | |
c906108c | 1629 | |
488f131b JB |
1630 | Note that although the logical place to reenable h/w watches |
1631 | is here, we cannot. We cannot reenable them before stepping | |
1632 | the thread (this causes the next wait on the thread to hang). | |
c4093a6a | 1633 | |
488f131b JB |
1634 | Nor can we enable them after stepping until we've done a wait. |
1635 | Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait | |
1636 | here, which will be serviced immediately after the target | |
1637 | is waited on. */ | |
1638 | case TARGET_WAITKIND_SYSCALL_RETURN: | |
1639 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); | |
1640 | ||
1641 | if (number_of_threads_in_syscalls > 0) | |
1642 | { | |
1643 | number_of_threads_in_syscalls--; | |
1644 | ecs->enable_hw_watchpoints_after_wait = | |
1645 | (number_of_threads_in_syscalls == 0); | |
1646 | } | |
1647 | prepare_to_wait (ecs); | |
1648 | return; | |
c906108c | 1649 | |
488f131b JB |
1650 | case TARGET_WAITKIND_STOPPED: |
1651 | stop_signal = ecs->ws.value.sig; | |
1652 | break; | |
c906108c | 1653 | |
488f131b JB |
1654 | /* We had an event in the inferior, but we are not interested |
1655 | in handling it at this level. The lower layers have already | |
8e7d2c16 DJ |
1656 | done what needs to be done, if anything. |
1657 | ||
1658 | One of the possible circumstances for this is when the | |
1659 | inferior produces output for the console. The inferior has | |
1660 | not stopped, and we are ignoring the event. Another possible | |
1661 | circumstance is any event which the lower level knows will be | |
1662 | reported multiple times without an intervening resume. */ | |
488f131b | 1663 | case TARGET_WAITKIND_IGNORE: |
8e7d2c16 | 1664 | prepare_to_wait (ecs); |
488f131b JB |
1665 | return; |
1666 | } | |
c906108c | 1667 | |
488f131b JB |
1668 | /* We may want to consider not doing a resume here in order to give |
1669 | the user a chance to play with the new thread. It might be good | |
1670 | to make that a user-settable option. */ | |
c906108c | 1671 | |
488f131b JB |
1672 | /* At this point, all threads are stopped (happens automatically in |
1673 | either the OS or the native code). Therefore we need to continue | |
1674 | all threads in order to make progress. */ | |
1675 | if (ecs->new_thread_event) | |
1676 | { | |
1677 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1678 | prepare_to_wait (ecs); | |
1679 | return; | |
1680 | } | |
c906108c | 1681 | |
488f131b JB |
1682 | stop_pc = read_pc_pid (ecs->ptid); |
1683 | ||
9f976b41 DJ |
1684 | if (stepping_past_singlestep_breakpoint) |
1685 | { | |
1686 | gdb_assert (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p); | |
1687 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); | |
1688 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
1689 | ||
1690 | stepping_past_singlestep_breakpoint = 0; | |
1691 | ||
1692 | /* We've either finished single-stepping past the single-step | |
1693 | breakpoint, or stopped for some other reason. It would be nice if | |
1694 | we could tell, but we can't reliably. */ | |
1695 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1696 | { | |
1697 | /* Pull the single step breakpoints out of the target. */ | |
1698 | SOFTWARE_SINGLE_STEP (0, 0); | |
1699 | singlestep_breakpoints_inserted_p = 0; | |
1700 | ||
1701 | ecs->random_signal = 0; | |
1702 | ||
1703 | ecs->ptid = saved_singlestep_ptid; | |
1704 | context_switch (ecs); | |
9a4105ab AC |
1705 | if (deprecated_context_hook) |
1706 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
1707 | |
1708 | resume (1, TARGET_SIGNAL_0); | |
1709 | prepare_to_wait (ecs); | |
1710 | return; | |
1711 | } | |
1712 | } | |
1713 | ||
1714 | stepping_past_singlestep_breakpoint = 0; | |
1715 | ||
488f131b JB |
1716 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1717 | another thread. If so, then step that thread past the breakpoint, | |
1718 | and continue it. */ | |
1719 | ||
1720 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1721 | { | |
9f976b41 DJ |
1722 | int thread_hop_needed = 0; |
1723 | ||
f8d40ec8 JB |
1724 | /* Check if a regular breakpoint has been hit before checking |
1725 | for a potential single step breakpoint. Otherwise, GDB will | |
1726 | not see this breakpoint hit when stepping onto breakpoints. */ | |
4fa8626c | 1727 | if (breakpoints_inserted && breakpoint_here_p (stop_pc)) |
488f131b | 1728 | { |
c5aa993b | 1729 | ecs->random_signal = 0; |
4fa8626c | 1730 | if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
9f976b41 DJ |
1731 | thread_hop_needed = 1; |
1732 | } | |
1733 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
1734 | { | |
1735 | ecs->random_signal = 0; | |
1736 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
1737 | change when we go from single-threaded to multi-threaded. If | |
1738 | the singlestep_ptid is still in the list, assume that it is | |
1739 | really different from ecs->ptid. */ | |
1740 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
1741 | && in_thread_list (singlestep_ptid)) | |
1742 | { | |
1743 | thread_hop_needed = 1; | |
1744 | stepping_past_singlestep_breakpoint = 1; | |
1745 | saved_singlestep_ptid = singlestep_ptid; | |
1746 | } | |
1747 | } | |
1748 | ||
1749 | if (thread_hop_needed) | |
488f131b JB |
1750 | { |
1751 | int remove_status; | |
1752 | ||
1753 | /* Saw a breakpoint, but it was hit by the wrong thread. | |
1754 | Just continue. */ | |
488f131b | 1755 | |
9f976b41 DJ |
1756 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1757 | { | |
1758 | /* Pull the single step breakpoints out of the target. */ | |
1759 | SOFTWARE_SINGLE_STEP (0, 0); | |
1760 | singlestep_breakpoints_inserted_p = 0; | |
1761 | } | |
1762 | ||
488f131b JB |
1763 | remove_status = remove_breakpoints (); |
1764 | /* Did we fail to remove breakpoints? If so, try | |
1765 | to set the PC past the bp. (There's at least | |
1766 | one situation in which we can fail to remove | |
1767 | the bp's: On HP-UX's that use ttrace, we can't | |
1768 | change the address space of a vforking child | |
1769 | process until the child exits (well, okay, not | |
1770 | then either :-) or execs. */ | |
1771 | if (remove_status != 0) | |
1772 | { | |
1773 | /* FIXME! This is obviously non-portable! */ | |
4fa8626c | 1774 | write_pc_pid (stop_pc + 4, ecs->ptid); |
488f131b JB |
1775 | /* We need to restart all the threads now, |
1776 | * unles we're running in scheduler-locked mode. | |
1777 | * Use currently_stepping to determine whether to | |
1778 | * step or continue. | |
1779 | */ | |
1780 | /* FIXME MVS: is there any reason not to call resume()? */ | |
1781 | if (scheduler_mode == schedlock_on) | |
1782 | target_resume (ecs->ptid, | |
1783 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1784 | else | |
1785 | target_resume (RESUME_ALL, | |
1786 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1787 | prepare_to_wait (ecs); | |
1788 | return; | |
1789 | } | |
1790 | else | |
1791 | { /* Single step */ | |
1792 | breakpoints_inserted = 0; | |
1793 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
1794 | context_switch (ecs); | |
1795 | ecs->waiton_ptid = ecs->ptid; | |
1796 | ecs->wp = &(ecs->ws); | |
1797 | ecs->another_trap = 1; | |
1798 | ||
1799 | ecs->infwait_state = infwait_thread_hop_state; | |
1800 | keep_going (ecs); | |
1801 | registers_changed (); | |
1802 | return; | |
1803 | } | |
488f131b | 1804 | } |
f8d40ec8 JB |
1805 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1806 | { | |
c8edd8b4 | 1807 | sw_single_step_trap_p = 1; |
f8d40ec8 JB |
1808 | ecs->random_signal = 0; |
1809 | } | |
488f131b JB |
1810 | } |
1811 | else | |
1812 | ecs->random_signal = 1; | |
c906108c | 1813 | |
488f131b | 1814 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
1815 | so, then switch to that thread. */ |
1816 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 1817 | { |
488f131b | 1818 | context_switch (ecs); |
c5aa993b | 1819 | |
9a4105ab AC |
1820 | if (deprecated_context_hook) |
1821 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
c5aa993b | 1822 | |
488f131b JB |
1823 | flush_cached_frames (); |
1824 | } | |
c906108c | 1825 | |
488f131b JB |
1826 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1827 | { | |
1828 | /* Pull the single step breakpoints out of the target. */ | |
1829 | SOFTWARE_SINGLE_STEP (0, 0); | |
1830 | singlestep_breakpoints_inserted_p = 0; | |
1831 | } | |
c906108c | 1832 | |
488f131b JB |
1833 | /* If PC is pointing at a nullified instruction, then step beyond |
1834 | it so that the user won't be confused when GDB appears to be ready | |
1835 | to execute it. */ | |
c906108c | 1836 | |
488f131b JB |
1837 | /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */ |
1838 | if (INSTRUCTION_NULLIFIED) | |
1839 | { | |
1840 | registers_changed (); | |
1841 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); | |
c906108c | 1842 | |
488f131b JB |
1843 | /* We may have received a signal that we want to pass to |
1844 | the inferior; therefore, we must not clobber the waitstatus | |
1845 | in WS. */ | |
c906108c | 1846 | |
488f131b JB |
1847 | ecs->infwait_state = infwait_nullified_state; |
1848 | ecs->waiton_ptid = ecs->ptid; | |
1849 | ecs->wp = &(ecs->tmpstatus); | |
1850 | prepare_to_wait (ecs); | |
1851 | return; | |
1852 | } | |
c906108c | 1853 | |
488f131b JB |
1854 | /* It may not be necessary to disable the watchpoint to stop over |
1855 | it. For example, the PA can (with some kernel cooperation) | |
1856 | single step over a watchpoint without disabling the watchpoint. */ | |
1857 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1858 | { | |
1859 | resume (1, 0); | |
1860 | prepare_to_wait (ecs); | |
1861 | return; | |
1862 | } | |
c906108c | 1863 | |
488f131b JB |
1864 | /* It is far more common to need to disable a watchpoint to step |
1865 | the inferior over it. FIXME. What else might a debug | |
1866 | register or page protection watchpoint scheme need here? */ | |
1867 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1868 | { | |
1869 | /* At this point, we are stopped at an instruction which has | |
1870 | attempted to write to a piece of memory under control of | |
1871 | a watchpoint. The instruction hasn't actually executed | |
1872 | yet. If we were to evaluate the watchpoint expression | |
1873 | now, we would get the old value, and therefore no change | |
1874 | would seem to have occurred. | |
1875 | ||
1876 | In order to make watchpoints work `right', we really need | |
1877 | to complete the memory write, and then evaluate the | |
1878 | watchpoint expression. The following code does that by | |
1879 | removing the watchpoint (actually, all watchpoints and | |
1880 | breakpoints), single-stepping the target, re-inserting | |
1881 | watchpoints, and then falling through to let normal | |
1882 | single-step processing handle proceed. Since this | |
1883 | includes evaluating watchpoints, things will come to a | |
1884 | stop in the correct manner. */ | |
1885 | ||
488f131b JB |
1886 | remove_breakpoints (); |
1887 | registers_changed (); | |
1888 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
c5aa993b | 1889 | |
488f131b JB |
1890 | ecs->waiton_ptid = ecs->ptid; |
1891 | ecs->wp = &(ecs->ws); | |
1892 | ecs->infwait_state = infwait_nonstep_watch_state; | |
1893 | prepare_to_wait (ecs); | |
1894 | return; | |
1895 | } | |
1896 | ||
1897 | /* It may be possible to simply continue after a watchpoint. */ | |
1898 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
1899 | STOPPED_BY_WATCHPOINT (ecs->ws); | |
1900 | ||
1901 | ecs->stop_func_start = 0; | |
1902 | ecs->stop_func_end = 0; | |
1903 | ecs->stop_func_name = 0; | |
1904 | /* Don't care about return value; stop_func_start and stop_func_name | |
1905 | will both be 0 if it doesn't work. */ | |
1906 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
1907 | &ecs->stop_func_start, &ecs->stop_func_end); | |
1908 | ecs->stop_func_start += FUNCTION_START_OFFSET; | |
1909 | ecs->another_trap = 0; | |
1910 | bpstat_clear (&stop_bpstat); | |
1911 | stop_step = 0; | |
1912 | stop_stack_dummy = 0; | |
1913 | stop_print_frame = 1; | |
1914 | ecs->random_signal = 0; | |
1915 | stopped_by_random_signal = 0; | |
1916 | breakpoints_failed = 0; | |
1917 | ||
1918 | /* Look at the cause of the stop, and decide what to do. | |
1919 | The alternatives are: | |
1920 | 1) break; to really stop and return to the debugger, | |
1921 | 2) drop through to start up again | |
1922 | (set ecs->another_trap to 1 to single step once) | |
1923 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
1924 | will be made according to the signal handling tables. */ | |
1925 | ||
1926 | /* First, distinguish signals caused by the debugger from signals | |
03cebad2 MK |
1927 | that have to do with the program's own actions. Note that |
1928 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
1929 | on the operating system version. Here we detect when a SIGILL or | |
1930 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
1931 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
1932 | when we're trying to execute a breakpoint instruction on a | |
1933 | non-executable stack. This happens for call dummy breakpoints | |
1934 | for architectures like SPARC that place call dummies on the | |
1935 | stack. */ | |
488f131b JB |
1936 | |
1937 | if (stop_signal == TARGET_SIGNAL_TRAP | |
1938 | || (breakpoints_inserted && | |
1939 | (stop_signal == TARGET_SIGNAL_ILL | |
03cebad2 | 1940 | || stop_signal == TARGET_SIGNAL_SEGV |
c54cfec8 | 1941 | || stop_signal == TARGET_SIGNAL_EMT)) |
c0236d92 EZ |
1942 | || stop_soon == STOP_QUIETLY |
1943 | || stop_soon == STOP_QUIETLY_NO_SIGSTOP) | |
488f131b JB |
1944 | { |
1945 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1946 | { | |
1947 | stop_print_frame = 0; | |
1948 | stop_stepping (ecs); | |
1949 | return; | |
1950 | } | |
c54cfec8 EZ |
1951 | |
1952 | /* This is originated from start_remote(), start_inferior() and | |
1953 | shared libraries hook functions. */ | |
c0236d92 | 1954 | if (stop_soon == STOP_QUIETLY) |
488f131b JB |
1955 | { |
1956 | stop_stepping (ecs); | |
1957 | return; | |
1958 | } | |
1959 | ||
c54cfec8 EZ |
1960 | /* This originates from attach_command(). We need to overwrite |
1961 | the stop_signal here, because some kernels don't ignore a | |
1962 | SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call. | |
1963 | See more comments in inferior.h. */ | |
c0236d92 | 1964 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
c54cfec8 EZ |
1965 | { |
1966 | stop_stepping (ecs); | |
1967 | if (stop_signal == TARGET_SIGNAL_STOP) | |
1968 | stop_signal = TARGET_SIGNAL_0; | |
1969 | return; | |
1970 | } | |
1971 | ||
d303a6c7 AC |
1972 | /* Don't even think about breakpoints if just proceeded over a |
1973 | breakpoint. */ | |
1974 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected) | |
488f131b JB |
1975 | bpstat_clear (&stop_bpstat); |
1976 | else | |
1977 | { | |
1978 | /* See if there is a breakpoint at the current PC. */ | |
fa5281d0 | 1979 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid); |
488f131b | 1980 | |
488f131b JB |
1981 | /* Following in case break condition called a |
1982 | function. */ | |
1983 | stop_print_frame = 1; | |
1984 | } | |
1985 | ||
73dd234f AC |
1986 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
1987 | at one stage in the past included checks for an inferior | |
1988 | function call's call dummy's return breakpoint. The original | |
1989 | comment, that went with the test, read: | |
1990 | ||
1991 | ``End of a stack dummy. Some systems (e.g. Sony news) give | |
1992 | another signal besides SIGTRAP, so check here as well as | |
1993 | above.'' | |
1994 | ||
1995 | If someone ever tries to get get call dummys on a | |
1996 | non-executable stack to work (where the target would stop | |
03cebad2 MK |
1997 | with something like a SIGSEGV), then those tests might need |
1998 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 1999 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
2000 | suspect that it won't be the case. |
2001 | ||
2002 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to | |
2003 | be necessary for call dummies on a non-executable stack on | |
2004 | SPARC. */ | |
73dd234f | 2005 | |
488f131b JB |
2006 | if (stop_signal == TARGET_SIGNAL_TRAP) |
2007 | ecs->random_signal | |
2008 | = !(bpstat_explains_signal (stop_bpstat) | |
2009 | || trap_expected | |
488f131b | 2010 | || (step_range_end && step_resume_breakpoint == NULL)); |
488f131b JB |
2011 | else |
2012 | { | |
73dd234f | 2013 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
488f131b JB |
2014 | if (!ecs->random_signal) |
2015 | stop_signal = TARGET_SIGNAL_TRAP; | |
2016 | } | |
2017 | } | |
2018 | ||
2019 | /* When we reach this point, we've pretty much decided | |
2020 | that the reason for stopping must've been a random | |
2021 | (unexpected) signal. */ | |
2022 | ||
2023 | else | |
2024 | ecs->random_signal = 1; | |
488f131b | 2025 | |
04e68871 | 2026 | process_event_stop_test: |
488f131b JB |
2027 | /* For the program's own signals, act according to |
2028 | the signal handling tables. */ | |
2029 | ||
2030 | if (ecs->random_signal) | |
2031 | { | |
2032 | /* Signal not for debugging purposes. */ | |
2033 | int printed = 0; | |
2034 | ||
2035 | stopped_by_random_signal = 1; | |
2036 | ||
2037 | if (signal_print[stop_signal]) | |
2038 | { | |
2039 | printed = 1; | |
2040 | target_terminal_ours_for_output (); | |
2041 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
2042 | } | |
2043 | if (signal_stop[stop_signal]) | |
2044 | { | |
2045 | stop_stepping (ecs); | |
2046 | return; | |
2047 | } | |
2048 | /* If not going to stop, give terminal back | |
2049 | if we took it away. */ | |
2050 | else if (printed) | |
2051 | target_terminal_inferior (); | |
2052 | ||
2053 | /* Clear the signal if it should not be passed. */ | |
2054 | if (signal_program[stop_signal] == 0) | |
2055 | stop_signal = TARGET_SIGNAL_0; | |
2056 | ||
d303a6c7 AC |
2057 | if (step_range_end != 0 |
2058 | && stop_signal != TARGET_SIGNAL_0 | |
2059 | && stop_pc >= step_range_start && stop_pc < step_range_end | |
2060 | && frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id)) | |
2061 | { | |
2062 | /* The inferior is about to take a signal that will take it | |
2063 | out of the single step range. Set a breakpoint at the | |
2064 | current PC (which is presumably where the signal handler | |
2065 | will eventually return) and then allow the inferior to | |
2066 | run free. | |
2067 | ||
2068 | Note that this is only needed for a signal delivered | |
2069 | while in the single-step range. Nested signals aren't a | |
2070 | problem as they eventually all return. */ | |
2071 | insert_step_resume_breakpoint (get_current_frame (), ecs); | |
2072 | } | |
488f131b JB |
2073 | keep_going (ecs); |
2074 | return; | |
2075 | } | |
2076 | ||
2077 | /* Handle cases caused by hitting a breakpoint. */ | |
2078 | { | |
2079 | CORE_ADDR jmp_buf_pc; | |
2080 | struct bpstat_what what; | |
2081 | ||
2082 | what = bpstat_what (stop_bpstat); | |
2083 | ||
2084 | if (what.call_dummy) | |
2085 | { | |
2086 | stop_stack_dummy = 1; | |
2087 | #ifdef HP_OS_BUG | |
2088 | trap_expected_after_continue = 1; | |
2089 | #endif | |
c5aa993b | 2090 | } |
c906108c | 2091 | |
488f131b | 2092 | switch (what.main_action) |
c5aa993b | 2093 | { |
488f131b JB |
2094 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2095 | /* If we hit the breakpoint at longjmp, disable it for the | |
2096 | duration of this command. Then, install a temporary | |
2097 | breakpoint at the target of the jmp_buf. */ | |
2098 | disable_longjmp_breakpoint (); | |
2099 | remove_breakpoints (); | |
2100 | breakpoints_inserted = 0; | |
2101 | if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
c5aa993b | 2102 | { |
488f131b | 2103 | keep_going (ecs); |
104c1213 | 2104 | return; |
c5aa993b | 2105 | } |
488f131b JB |
2106 | |
2107 | /* Need to blow away step-resume breakpoint, as it | |
2108 | interferes with us */ | |
2109 | if (step_resume_breakpoint != NULL) | |
104c1213 | 2110 | { |
488f131b | 2111 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
104c1213 | 2112 | } |
c906108c | 2113 | |
488f131b JB |
2114 | #if 0 |
2115 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2116 | if (step_over_calls > 0) | |
2117 | set_longjmp_resume_breakpoint (jmp_buf_pc, get_current_frame ()); | |
c5aa993b | 2118 | else |
488f131b | 2119 | #endif /* 0 */ |
818dd999 | 2120 | set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
488f131b JB |
2121 | ecs->handling_longjmp = 1; /* FIXME */ |
2122 | keep_going (ecs); | |
2123 | return; | |
c906108c | 2124 | |
488f131b JB |
2125 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2126 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
2127 | remove_breakpoints (); | |
2128 | breakpoints_inserted = 0; | |
2129 | #if 0 | |
2130 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2131 | if (step_over_calls | |
aa0cd9c1 AC |
2132 | && (frame_id_inner (get_frame_id (get_current_frame ()), |
2133 | step_frame_id))) | |
c5aa993b | 2134 | { |
488f131b | 2135 | ecs->another_trap = 1; |
d4f3574e SS |
2136 | keep_going (ecs); |
2137 | return; | |
c5aa993b | 2138 | } |
488f131b JB |
2139 | #endif /* 0 */ |
2140 | disable_longjmp_breakpoint (); | |
2141 | ecs->handling_longjmp = 0; /* FIXME */ | |
2142 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2143 | break; | |
2144 | /* else fallthrough */ | |
2145 | ||
2146 | case BPSTAT_WHAT_SINGLE: | |
2147 | if (breakpoints_inserted) | |
c5aa993b | 2148 | { |
488f131b | 2149 | remove_breakpoints (); |
c5aa993b | 2150 | } |
488f131b JB |
2151 | breakpoints_inserted = 0; |
2152 | ecs->another_trap = 1; | |
2153 | /* Still need to check other stuff, at least the case | |
2154 | where we are stepping and step out of the right range. */ | |
2155 | break; | |
c906108c | 2156 | |
488f131b JB |
2157 | case BPSTAT_WHAT_STOP_NOISY: |
2158 | stop_print_frame = 1; | |
c906108c | 2159 | |
d303a6c7 AC |
2160 | /* We are about to nuke the step_resume_breakpointt via the |
2161 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2162 | |
488f131b JB |
2163 | stop_stepping (ecs); |
2164 | return; | |
c5aa993b | 2165 | |
488f131b JB |
2166 | case BPSTAT_WHAT_STOP_SILENT: |
2167 | stop_print_frame = 0; | |
c5aa993b | 2168 | |
d303a6c7 AC |
2169 | /* We are about to nuke the step_resume_breakpoin via the |
2170 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2171 | |
488f131b | 2172 | stop_stepping (ecs); |
e441088d | 2173 | return; |
c5aa993b | 2174 | |
488f131b JB |
2175 | case BPSTAT_WHAT_STEP_RESUME: |
2176 | /* This proably demands a more elegant solution, but, yeah | |
2177 | right... | |
c5aa993b | 2178 | |
488f131b JB |
2179 | This function's use of the simple variable |
2180 | step_resume_breakpoint doesn't seem to accomodate | |
2181 | simultaneously active step-resume bp's, although the | |
2182 | breakpoint list certainly can. | |
c5aa993b | 2183 | |
488f131b JB |
2184 | If we reach here and step_resume_breakpoint is already |
2185 | NULL, then apparently we have multiple active | |
2186 | step-resume bp's. We'll just delete the breakpoint we | |
2187 | stopped at, and carry on. | |
2188 | ||
2189 | Correction: what the code currently does is delete a | |
2190 | step-resume bp, but it makes no effort to ensure that | |
2191 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2192 | |
488f131b JB |
2193 | if (step_resume_breakpoint == NULL) |
2194 | { | |
2195 | step_resume_breakpoint = | |
2196 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2197 | } | |
2198 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
2199 | break; | |
2200 | ||
2201 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
488f131b JB |
2202 | /* If were waiting for a trap, hitting the step_resume_break |
2203 | doesn't count as getting it. */ | |
2204 | if (trap_expected) | |
2205 | ecs->another_trap = 1; | |
2206 | break; | |
2207 | ||
2208 | case BPSTAT_WHAT_CHECK_SHLIBS: | |
2209 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2210 | #ifdef SOLIB_ADD | |
c906108c | 2211 | { |
488f131b JB |
2212 | /* Remove breakpoints, we eventually want to step over the |
2213 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2214 | breakpoint addresses via breakpoint_re_set. */ | |
2215 | if (breakpoints_inserted) | |
2216 | remove_breakpoints (); | |
c5aa993b | 2217 | breakpoints_inserted = 0; |
488f131b JB |
2218 | |
2219 | /* Check for any newly added shared libraries if we're | |
2220 | supposed to be adding them automatically. Switch | |
2221 | terminal for any messages produced by | |
2222 | breakpoint_re_set. */ | |
2223 | target_terminal_ours_for_output (); | |
aff6338a AC |
2224 | /* NOTE: cagney/2003-11-25: Make certain that the target |
2225 | stack's section table is kept up-to-date. Architectures, | |
2226 | (e.g., PPC64), use the section table to perform | |
2227 | operations such as address => section name and hence | |
2228 | require the table to contain all sections (including | |
2229 | those found in shared libraries). */ | |
2230 | /* NOTE: cagney/2003-11-25: Pass current_target and not | |
2231 | exec_ops to SOLIB_ADD. This is because current GDB is | |
2232 | only tooled to propagate section_table changes out from | |
2233 | the "current_target" (see target_resize_to_sections), and | |
2234 | not up from the exec stratum. This, of course, isn't | |
2235 | right. "infrun.c" should only interact with the | |
2236 | exec/process stratum, instead relying on the target stack | |
2237 | to propagate relevant changes (stop, section table | |
2238 | changed, ...) up to other layers. */ | |
2239 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); | |
488f131b JB |
2240 | target_terminal_inferior (); |
2241 | ||
2242 | /* Try to reenable shared library breakpoints, additional | |
2243 | code segments in shared libraries might be mapped in now. */ | |
2244 | re_enable_breakpoints_in_shlibs (); | |
2245 | ||
2246 | /* If requested, stop when the dynamic linker notifies | |
2247 | gdb of events. This allows the user to get control | |
2248 | and place breakpoints in initializer routines for | |
2249 | dynamically loaded objects (among other things). */ | |
877522db | 2250 | if (stop_on_solib_events || stop_stack_dummy) |
d4f3574e | 2251 | { |
488f131b | 2252 | stop_stepping (ecs); |
d4f3574e SS |
2253 | return; |
2254 | } | |
c5aa993b | 2255 | |
488f131b JB |
2256 | /* If we stopped due to an explicit catchpoint, then the |
2257 | (see above) call to SOLIB_ADD pulled in any symbols | |
2258 | from a newly-loaded library, if appropriate. | |
2259 | ||
2260 | We do want the inferior to stop, but not where it is | |
2261 | now, which is in the dynamic linker callback. Rather, | |
2262 | we would like it stop in the user's program, just after | |
2263 | the call that caused this catchpoint to trigger. That | |
2264 | gives the user a more useful vantage from which to | |
2265 | examine their program's state. */ | |
2266 | else if (what.main_action == | |
2267 | BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
c906108c | 2268 | { |
488f131b JB |
2269 | /* ??rehrauer: If I could figure out how to get the |
2270 | right return PC from here, we could just set a temp | |
2271 | breakpoint and resume. I'm not sure we can without | |
2272 | cracking open the dld's shared libraries and sniffing | |
2273 | their unwind tables and text/data ranges, and that's | |
2274 | not a terribly portable notion. | |
2275 | ||
2276 | Until that time, we must step the inferior out of the | |
2277 | dld callback, and also out of the dld itself (and any | |
2278 | code or stubs in libdld.sl, such as "shl_load" and | |
2279 | friends) until we reach non-dld code. At that point, | |
2280 | we can stop stepping. */ | |
2281 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2282 | &ecs-> | |
2283 | stepping_through_solib_catchpoints); | |
2284 | ecs->stepping_through_solib_after_catch = 1; | |
2285 | ||
2286 | /* Be sure to lift all breakpoints, so the inferior does | |
2287 | actually step past this point... */ | |
2288 | ecs->another_trap = 1; | |
2289 | break; | |
c906108c | 2290 | } |
c5aa993b | 2291 | else |
c5aa993b | 2292 | { |
488f131b | 2293 | /* We want to step over this breakpoint, then keep going. */ |
c5aa993b | 2294 | ecs->another_trap = 1; |
488f131b | 2295 | break; |
c5aa993b | 2296 | } |
488f131b JB |
2297 | } |
2298 | #endif | |
2299 | break; | |
c906108c | 2300 | |
488f131b JB |
2301 | case BPSTAT_WHAT_LAST: |
2302 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2303 | |
488f131b JB |
2304 | case BPSTAT_WHAT_KEEP_CHECKING: |
2305 | break; | |
2306 | } | |
2307 | } | |
c906108c | 2308 | |
488f131b JB |
2309 | /* We come here if we hit a breakpoint but should not |
2310 | stop for it. Possibly we also were stepping | |
2311 | and should stop for that. So fall through and | |
2312 | test for stepping. But, if not stepping, | |
2313 | do not stop. */ | |
c906108c | 2314 | |
488f131b JB |
2315 | /* Are we stepping to get the inferior out of the dynamic |
2316 | linker's hook (and possibly the dld itself) after catching | |
2317 | a shlib event? */ | |
2318 | if (ecs->stepping_through_solib_after_catch) | |
2319 | { | |
2320 | #if defined(SOLIB_ADD) | |
2321 | /* Have we reached our destination? If not, keep going. */ | |
2322 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2323 | { | |
2324 | ecs->another_trap = 1; | |
2325 | keep_going (ecs); | |
104c1213 | 2326 | return; |
488f131b JB |
2327 | } |
2328 | #endif | |
2329 | /* Else, stop and report the catchpoint(s) whose triggering | |
2330 | caused us to begin stepping. */ | |
2331 | ecs->stepping_through_solib_after_catch = 0; | |
2332 | bpstat_clear (&stop_bpstat); | |
2333 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2334 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2335 | stop_print_frame = 1; | |
2336 | stop_stepping (ecs); | |
2337 | return; | |
2338 | } | |
c906108c | 2339 | |
488f131b JB |
2340 | if (step_resume_breakpoint) |
2341 | { | |
2342 | /* Having a step-resume breakpoint overrides anything | |
2343 | else having to do with stepping commands until | |
2344 | that breakpoint is reached. */ | |
488f131b JB |
2345 | keep_going (ecs); |
2346 | return; | |
2347 | } | |
c5aa993b | 2348 | |
488f131b JB |
2349 | if (step_range_end == 0) |
2350 | { | |
2351 | /* Likewise if we aren't even stepping. */ | |
488f131b JB |
2352 | keep_going (ecs); |
2353 | return; | |
2354 | } | |
c5aa993b | 2355 | |
488f131b | 2356 | /* If stepping through a line, keep going if still within it. |
c906108c | 2357 | |
488f131b JB |
2358 | Note that step_range_end is the address of the first instruction |
2359 | beyond the step range, and NOT the address of the last instruction | |
2360 | within it! */ | |
2361 | if (stop_pc >= step_range_start && stop_pc < step_range_end) | |
2362 | { | |
488f131b JB |
2363 | keep_going (ecs); |
2364 | return; | |
2365 | } | |
c5aa993b | 2366 | |
488f131b | 2367 | /* We stepped out of the stepping range. */ |
c906108c | 2368 | |
488f131b JB |
2369 | /* If we are stepping at the source level and entered the runtime |
2370 | loader dynamic symbol resolution code, we keep on single stepping | |
2371 | until we exit the run time loader code and reach the callee's | |
2372 | address. */ | |
2373 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2374 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) | |
2375 | { | |
4c8c40e6 MK |
2376 | CORE_ADDR pc_after_resolver = |
2377 | gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); | |
c906108c | 2378 | |
488f131b JB |
2379 | if (pc_after_resolver) |
2380 | { | |
2381 | /* Set up a step-resume breakpoint at the address | |
2382 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2383 | struct symtab_and_line sr_sal; | |
fe39c653 | 2384 | init_sal (&sr_sal); |
488f131b JB |
2385 | sr_sal.pc = pc_after_resolver; |
2386 | ||
2387 | check_for_old_step_resume_breakpoint (); | |
2388 | step_resume_breakpoint = | |
818dd999 | 2389 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
488f131b JB |
2390 | if (breakpoints_inserted) |
2391 | insert_breakpoints (); | |
c5aa993b | 2392 | } |
c906108c | 2393 | |
488f131b JB |
2394 | keep_going (ecs); |
2395 | return; | |
2396 | } | |
c906108c | 2397 | |
a587af0b AC |
2398 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE |
2399 | && ecs->stop_func_name == NULL) | |
2400 | { | |
2401 | /* There is no symbol, not even a minimal symbol, corresponding | |
2402 | to the address where we just stopped. So we just stepped | |
2403 | inside undebuggable code. Since we want to step over this | |
2404 | kind of code, we keep going until the inferior returns from | |
2405 | the current function. */ | |
2406 | handle_step_into_function (ecs); | |
2407 | return; | |
2408 | } | |
2409 | ||
488f131b JB |
2410 | /* We can't update step_sp every time through the loop, because |
2411 | reading the stack pointer would slow down stepping too much. | |
2412 | But we can update it every time we leave the step range. */ | |
2413 | ecs->update_step_sp = 1; | |
c906108c | 2414 | |
ca4bb888 AC |
2415 | /* Did we just step into a singal trampoline (either by stepping out |
2416 | of a handler, or by taking a signal)? */ | |
08e69816 AC |
2417 | if (get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME |
2418 | && !frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id)) | |
488f131b | 2419 | { |
c5aa993b | 2420 | { |
aa0cd9c1 | 2421 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
c906108c | 2422 | |
aa0cd9c1 | 2423 | if (frame_id_inner (current_frame, step_frame_id)) |
488f131b JB |
2424 | { |
2425 | /* We have just taken a signal; go until we are back to | |
2426 | the point where we took it and one more. */ | |
c906108c | 2427 | |
488f131b JB |
2428 | /* This code is needed at least in the following case: |
2429 | The user types "next" and then a signal arrives (before | |
2430 | the "next" is done). */ | |
d4f3574e | 2431 | |
488f131b JB |
2432 | /* Note that if we are stopped at a breakpoint, then we need |
2433 | the step_resume breakpoint to override any breakpoints at | |
2434 | the same location, so that we will still step over the | |
2435 | breakpoint even though the signal happened. */ | |
d4f3574e | 2436 | struct symtab_and_line sr_sal; |
d4f3574e | 2437 | |
fe39c653 | 2438 | init_sal (&sr_sal); |
488f131b JB |
2439 | sr_sal.symtab = NULL; |
2440 | sr_sal.line = 0; | |
2441 | sr_sal.pc = prev_pc; | |
2442 | /* We could probably be setting the frame to | |
aa0cd9c1 | 2443 | step_frame_id; I don't think anyone thought to try it. */ |
d4f3574e SS |
2444 | check_for_old_step_resume_breakpoint (); |
2445 | step_resume_breakpoint = | |
818dd999 | 2446 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
d4f3574e SS |
2447 | if (breakpoints_inserted) |
2448 | insert_breakpoints (); | |
2449 | } | |
488f131b JB |
2450 | else |
2451 | { | |
2452 | /* We just stepped out of a signal handler and into | |
2453 | its calling trampoline. | |
2454 | ||
2455 | Normally, we'd call step_over_function from | |
2456 | here, but for some reason GDB can't unwind the | |
2457 | stack correctly to find the real PC for the point | |
2458 | user code where the signal trampoline will return | |
2459 | -- FRAME_SAVED_PC fails, at least on HP-UX 10.20. | |
2460 | But signal trampolines are pretty small stubs of | |
2461 | code, anyway, so it's OK instead to just | |
2462 | single-step out. Note: assuming such trampolines | |
2463 | don't exhibit recursion on any platform... */ | |
2464 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
2465 | &ecs->stop_func_start, | |
2466 | &ecs->stop_func_end); | |
2467 | /* Readjust stepping range */ | |
2468 | step_range_start = ecs->stop_func_start; | |
2469 | step_range_end = ecs->stop_func_end; | |
2470 | ecs->stepping_through_sigtramp = 1; | |
2471 | } | |
d4f3574e | 2472 | } |
c906108c | 2473 | |
c906108c | 2474 | |
488f131b JB |
2475 | /* If this is stepi or nexti, make sure that the stepping range |
2476 | gets us past that instruction. */ | |
2477 | if (step_range_end == 1) | |
2478 | /* FIXME: Does this run afoul of the code below which, if | |
2479 | we step into the middle of a line, resets the stepping | |
2480 | range? */ | |
2481 | step_range_end = (step_range_start = prev_pc) + 1; | |
2482 | ||
2483 | ecs->remove_breakpoints_on_following_step = 1; | |
2484 | keep_going (ecs); | |
2485 | return; | |
2486 | } | |
c906108c | 2487 | |
a587af0b AC |
2488 | if (frame_id_eq (get_frame_id (get_prev_frame (get_current_frame ())), |
2489 | step_frame_id)) | |
488f131b JB |
2490 | { |
2491 | /* It's a subroutine call. */ | |
1af510a8 | 2492 | handle_step_into_function (ecs); |
488f131b | 2493 | return; |
488f131b | 2494 | } |
c906108c | 2495 | |
488f131b | 2496 | /* We've wandered out of the step range. */ |
c906108c | 2497 | |
488f131b | 2498 | ecs->sal = find_pc_line (stop_pc, 0); |
c906108c | 2499 | |
488f131b JB |
2500 | if (step_range_end == 1) |
2501 | { | |
2502 | /* It is stepi or nexti. We always want to stop stepping after | |
2503 | one instruction. */ | |
2504 | stop_step = 1; | |
2505 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2506 | stop_stepping (ecs); | |
2507 | return; | |
2508 | } | |
c906108c | 2509 | |
488f131b JB |
2510 | /* If we're in the return path from a shared library trampoline, |
2511 | we want to proceed through the trampoline when stepping. */ | |
2512 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2513 | { | |
488f131b | 2514 | /* Determine where this trampoline returns. */ |
5cf4d23a | 2515 | CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); |
c906108c | 2516 | |
488f131b | 2517 | /* Only proceed through if we know where it's going. */ |
d764a824 | 2518 | if (real_stop_pc) |
488f131b JB |
2519 | { |
2520 | /* And put the step-breakpoint there and go until there. */ | |
2521 | struct symtab_and_line sr_sal; | |
2522 | ||
fe39c653 | 2523 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 2524 | sr_sal.pc = real_stop_pc; |
488f131b JB |
2525 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2526 | /* Do not specify what the fp should be when we stop | |
2527 | since on some machines the prologue | |
2528 | is where the new fp value is established. */ | |
2529 | check_for_old_step_resume_breakpoint (); | |
2530 | step_resume_breakpoint = | |
818dd999 | 2531 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
488f131b JB |
2532 | if (breakpoints_inserted) |
2533 | insert_breakpoints (); | |
c906108c | 2534 | |
488f131b JB |
2535 | /* Restart without fiddling with the step ranges or |
2536 | other state. */ | |
2537 | keep_going (ecs); | |
2538 | return; | |
2539 | } | |
2540 | } | |
c906108c | 2541 | |
488f131b JB |
2542 | if (ecs->sal.line == 0) |
2543 | { | |
2544 | /* We have no line number information. That means to stop | |
2545 | stepping (does this always happen right after one instruction, | |
2546 | when we do "s" in a function with no line numbers, | |
2547 | or can this happen as a result of a return or longjmp?). */ | |
2548 | stop_step = 1; | |
2549 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2550 | stop_stepping (ecs); | |
2551 | return; | |
2552 | } | |
c906108c | 2553 | |
488f131b JB |
2554 | if ((stop_pc == ecs->sal.pc) |
2555 | && (ecs->current_line != ecs->sal.line | |
2556 | || ecs->current_symtab != ecs->sal.symtab)) | |
2557 | { | |
2558 | /* We are at the start of a different line. So stop. Note that | |
2559 | we don't stop if we step into the middle of a different line. | |
2560 | That is said to make things like for (;;) statements work | |
2561 | better. */ | |
2562 | stop_step = 1; | |
2563 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2564 | stop_stepping (ecs); | |
2565 | return; | |
2566 | } | |
c906108c | 2567 | |
488f131b | 2568 | /* We aren't done stepping. |
c906108c | 2569 | |
488f131b JB |
2570 | Optimize by setting the stepping range to the line. |
2571 | (We might not be in the original line, but if we entered a | |
2572 | new line in mid-statement, we continue stepping. This makes | |
2573 | things like for(;;) statements work better.) */ | |
c906108c | 2574 | |
488f131b | 2575 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
c5aa993b | 2576 | { |
488f131b JB |
2577 | /* If this is the last line of the function, don't keep stepping |
2578 | (it would probably step us out of the function). | |
2579 | This is particularly necessary for a one-line function, | |
2580 | in which after skipping the prologue we better stop even though | |
2581 | we will be in mid-line. */ | |
2582 | stop_step = 1; | |
2583 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2584 | stop_stepping (ecs); | |
2585 | return; | |
c5aa993b | 2586 | } |
488f131b JB |
2587 | step_range_start = ecs->sal.pc; |
2588 | step_range_end = ecs->sal.end; | |
aa0cd9c1 | 2589 | step_frame_id = get_frame_id (get_current_frame ()); |
488f131b JB |
2590 | ecs->current_line = ecs->sal.line; |
2591 | ecs->current_symtab = ecs->sal.symtab; | |
2592 | ||
aa0cd9c1 AC |
2593 | /* In the case where we just stepped out of a function into the |
2594 | middle of a line of the caller, continue stepping, but | |
2595 | step_frame_id must be modified to current frame */ | |
65815ea1 AC |
2596 | #if 0 |
2597 | /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too | |
2598 | generous. It will trigger on things like a step into a frameless | |
2599 | stackless leaf function. I think the logic should instead look | |
2600 | at the unwound frame ID has that should give a more robust | |
2601 | indication of what happened. */ | |
2602 | if (step-ID == current-ID) | |
2603 | still stepping in same function; | |
2604 | else if (step-ID == unwind (current-ID)) | |
2605 | stepped into a function; | |
2606 | else | |
2607 | stepped out of a function; | |
2608 | /* Of course this assumes that the frame ID unwind code is robust | |
2609 | and we're willing to introduce frame unwind logic into this | |
ce2826aa | 2610 | function. Fortunately, those days are nearly upon us. */ |
65815ea1 | 2611 | #endif |
488f131b | 2612 | { |
aa0cd9c1 AC |
2613 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
2614 | if (!(frame_id_inner (current_frame, step_frame_id))) | |
2615 | step_frame_id = current_frame; | |
488f131b | 2616 | } |
c906108c | 2617 | |
488f131b | 2618 | keep_going (ecs); |
104c1213 JM |
2619 | } |
2620 | ||
2621 | /* Are we in the middle of stepping? */ | |
2622 | ||
2623 | static int | |
2624 | currently_stepping (struct execution_control_state *ecs) | |
2625 | { | |
d303a6c7 | 2626 | return ((!ecs->handling_longjmp |
104c1213 JM |
2627 | && ((step_range_end && step_resume_breakpoint == NULL) |
2628 | || trap_expected)) | |
2629 | || ecs->stepping_through_solib_after_catch | |
2630 | || bpstat_should_step ()); | |
2631 | } | |
c906108c | 2632 | |
c2c6d25f JM |
2633 | /* Subroutine call with source code we should not step over. Do step |
2634 | to the first line of code in it. */ | |
2635 | ||
2636 | static void | |
2637 | step_into_function (struct execution_control_state *ecs) | |
2638 | { | |
2639 | struct symtab *s; | |
2640 | struct symtab_and_line sr_sal; | |
2641 | ||
2642 | s = find_pc_symtab (stop_pc); | |
2643 | if (s && s->language != language_asm) | |
2644 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
2645 | ||
2646 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2647 | /* Use the step_resume_break to step until the end of the prologue, | |
2648 | even if that involves jumps (as it seems to on the vax under | |
2649 | 4.2). */ | |
2650 | /* If the prologue ends in the middle of a source line, continue to | |
2651 | the end of that source line (if it is still within the function). | |
2652 | Otherwise, just go to end of prologue. */ | |
c2c6d25f JM |
2653 | if (ecs->sal.end |
2654 | && ecs->sal.pc != ecs->stop_func_start | |
2655 | && ecs->sal.end < ecs->stop_func_end) | |
2656 | ecs->stop_func_start = ecs->sal.end; | |
c2c6d25f | 2657 | |
2dbd5e30 KB |
2658 | /* Architectures which require breakpoint adjustment might not be able |
2659 | to place a breakpoint at the computed address. If so, the test | |
2660 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
2661 | ecs->stop_func_start to an address at which a breakpoint may be | |
2662 | legitimately placed. | |
2663 | ||
2664 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not | |
2665 | made, GDB will enter an infinite loop when stepping through | |
2666 | optimized code consisting of VLIW instructions which contain | |
2667 | subinstructions corresponding to different source lines. On | |
2668 | FR-V, it's not permitted to place a breakpoint on any but the | |
2669 | first subinstruction of a VLIW instruction. When a breakpoint is | |
2670 | set, GDB will adjust the breakpoint address to the beginning of | |
2671 | the VLIW instruction. Thus, we need to make the corresponding | |
2672 | adjustment here when computing the stop address. */ | |
2673 | ||
2674 | if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) | |
2675 | { | |
2676 | ecs->stop_func_start | |
2677 | = gdbarch_adjust_breakpoint_address (current_gdbarch, | |
2678 | ecs->stop_func_start); | |
2679 | } | |
2680 | ||
c2c6d25f JM |
2681 | if (ecs->stop_func_start == stop_pc) |
2682 | { | |
2683 | /* We are already there: stop now. */ | |
2684 | stop_step = 1; | |
488f131b | 2685 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2686 | stop_stepping (ecs); |
2687 | return; | |
2688 | } | |
2689 | else | |
2690 | { | |
2691 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 2692 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
2693 | sr_sal.pc = ecs->stop_func_start; |
2694 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
2695 | /* Do not specify what the fp should be when we stop since on | |
488f131b JB |
2696 | some machines the prologue is where the new fp value is |
2697 | established. */ | |
c2c6d25f JM |
2698 | check_for_old_step_resume_breakpoint (); |
2699 | step_resume_breakpoint = | |
818dd999 | 2700 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
c2c6d25f JM |
2701 | if (breakpoints_inserted) |
2702 | insert_breakpoints (); | |
2703 | ||
2704 | /* And make sure stepping stops right away then. */ | |
2705 | step_range_end = step_range_start; | |
2706 | } | |
2707 | keep_going (ecs); | |
2708 | } | |
d4f3574e | 2709 | |
d303a6c7 AC |
2710 | /* The inferior, as a result of a function call (has left) or signal |
2711 | (about to leave) the single-step range. Set a momentary breakpoint | |
2712 | within the step range where the inferior is expected to later | |
2713 | return. */ | |
2714 | ||
2715 | static void | |
2716 | insert_step_resume_breakpoint (struct frame_info *step_frame, | |
2717 | struct execution_control_state *ecs) | |
2718 | { | |
2719 | struct symtab_and_line sr_sal; | |
2720 | ||
2721 | /* This is only used within the step-resume range/frame. */ | |
2722 | gdb_assert (frame_id_eq (step_frame_id, get_frame_id (step_frame))); | |
2723 | gdb_assert (step_range_end != 0); | |
2724 | gdb_assert (get_frame_pc (step_frame) >= step_range_start | |
2725 | && get_frame_pc (step_frame) < step_range_end); | |
2726 | ||
2727 | init_sal (&sr_sal); /* initialize to zeros */ | |
2728 | ||
2729 | sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (step_frame)); | |
2730 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2731 | ||
2732 | check_for_old_step_resume_breakpoint (); | |
2733 | ||
2734 | step_resume_breakpoint | |
2735 | = set_momentary_breakpoint (sr_sal, get_frame_id (step_frame), | |
2736 | bp_step_resume); | |
2737 | ||
2738 | if (breakpoints_inserted) | |
2739 | insert_breakpoints (); | |
2740 | } | |
2741 | ||
d4f3574e SS |
2742 | /* We've just entered a callee, and we wish to resume until it returns |
2743 | to the caller. Setting a step_resume breakpoint on the return | |
2744 | address will catch a return from the callee. | |
2745 | ||
2746 | However, if the callee is recursing, we want to be careful not to | |
2747 | catch returns of those recursive calls, but only of THIS instance | |
4fdf6121 | 2748 | of the caller. |
d4f3574e SS |
2749 | |
2750 | To do this, we set the step_resume bp's frame to our current | |
4fdf6121 | 2751 | caller's frame (obtained by doing a frame ID unwind). */ |
d4f3574e SS |
2752 | |
2753 | static void | |
2754 | step_over_function (struct execution_control_state *ecs) | |
2755 | { | |
2756 | struct symtab_and_line sr_sal; | |
c107cc1b | 2757 | struct frame_id sr_id; |
d4f3574e | 2758 | |
fe39c653 | 2759 | init_sal (&sr_sal); /* initialize to zeros */ |
4443bd83 AC |
2760 | |
2761 | /* NOTE: cagney/2003-04-06: | |
2762 | ||
2763 | At this point the equality get_frame_pc() == get_frame_func() | |
2764 | should hold. This may make it possible for this code to tell the | |
2765 | frame where it's function is, instead of the reverse. This would | |
2766 | avoid the need to search for the frame's function, which can get | |
2767 | very messy when there is no debug info available (look at the | |
2768 | heuristic find pc start code found in targets like the MIPS). */ | |
2769 | ||
6913c89a | 2770 | /* NOTE: cagney/2003-04-06: |
4443bd83 | 2771 | |
6913c89a | 2772 | The intent of DEPRECATED_SAVED_PC_AFTER_CALL was to: |
4443bd83 AC |
2773 | |
2774 | - provide a very light weight equivalent to frame_unwind_pc() | |
2775 | (nee FRAME_SAVED_PC) that avoids the prologue analyzer | |
2776 | ||
2777 | - avoid handling the case where the PC hasn't been saved in the | |
2778 | prologue analyzer | |
2779 | ||
ce2826aa | 2780 | Unfortunately, not five lines further down, is a call to |
4443bd83 AC |
2781 | get_frame_id() and that is guarenteed to trigger the prologue |
2782 | analyzer. | |
2783 | ||
2784 | The `correct fix' is for the prologe analyzer to handle the case | |
2785 | where the prologue is incomplete (PC in prologue) and, | |
2786 | consequently, the return pc has not yet been saved. It should be | |
2787 | noted that the prologue analyzer needs to handle this case | |
2788 | anyway: frameless leaf functions that don't save the return PC; | |
2789 | single stepping through a prologue. | |
2790 | ||
2791 | The d10v handles all this by bailing out of the prologue analsis | |
2792 | when it reaches the current instruction. */ | |
2793 | ||
6913c89a AC |
2794 | if (DEPRECATED_SAVED_PC_AFTER_CALL_P ()) |
2795 | sr_sal.pc = ADDR_BITS_REMOVE (DEPRECATED_SAVED_PC_AFTER_CALL (get_current_frame ())); | |
4443bd83 AC |
2796 | else |
2797 | sr_sal.pc = ADDR_BITS_REMOVE (frame_pc_unwind (get_current_frame ())); | |
d4f3574e SS |
2798 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2799 | ||
2800 | check_for_old_step_resume_breakpoint (); | |
d4f3574e | 2801 | |
08e69816 AC |
2802 | /* NOTE: cagney/2004-03-31: Code using the current value of |
2803 | "step_frame_id", instead of unwinding that frame ID, removed. On | |
2804 | s390 GNU/Linux, after taking a signal, the program is directly | |
2805 | resumed at the signal handler and, consequently, the PC would | |
2806 | point at at the first instruction of that signal handler but | |
2807 | STEP_FRAME_ID would [incorrectly] at the interrupted code when it | |
2808 | should point at the signal trampoline. By always and locally | |
2809 | doing a frame ID unwind, it's possible to assert that the code is | |
2810 | always using the correct ID. */ | |
2811 | sr_id = frame_unwind_id (get_current_frame ()); | |
c107cc1b AC |
2812 | |
2813 | step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id, bp_step_resume); | |
d4f3574e SS |
2814 | |
2815 | if (breakpoints_inserted) | |
2816 | insert_breakpoints (); | |
2817 | } | |
2818 | ||
104c1213 JM |
2819 | static void |
2820 | stop_stepping (struct execution_control_state *ecs) | |
2821 | { | |
cd0fc7c3 SS |
2822 | /* Let callers know we don't want to wait for the inferior anymore. */ |
2823 | ecs->wait_some_more = 0; | |
2824 | } | |
2825 | ||
d4f3574e SS |
2826 | /* This function handles various cases where we need to continue |
2827 | waiting for the inferior. */ | |
2828 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
2829 | ||
2830 | static void | |
2831 | keep_going (struct execution_control_state *ecs) | |
2832 | { | |
d4f3574e | 2833 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 2834 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e SS |
2835 | |
2836 | if (ecs->update_step_sp) | |
2837 | step_sp = read_sp (); | |
2838 | ecs->update_step_sp = 0; | |
2839 | ||
2840 | /* If we did not do break;, it means we should keep running the | |
2841 | inferior and not return to debugger. */ | |
2842 | ||
2843 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
2844 | { | |
2845 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
2846 | the inferior, else we'd have done a break above) and we |
2847 | haven't yet gotten our trap. Simply continue. */ | |
d4f3574e SS |
2848 | resume (currently_stepping (ecs), stop_signal); |
2849 | } | |
2850 | else | |
2851 | { | |
2852 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
2853 | anyway (the user asked that this signal be passed to the |
2854 | child) | |
2855 | -- or -- | |
2856 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2857 | decided we should resume from it. | |
d4f3574e | 2858 | |
488f131b | 2859 | We're going to run this baby now! |
d4f3574e | 2860 | |
488f131b JB |
2861 | Insert breakpoints now, unless we are trying to one-proceed |
2862 | past a breakpoint. */ | |
d4f3574e | 2863 | /* If we've just finished a special step resume and we don't |
488f131b | 2864 | want to hit a breakpoint, pull em out. */ |
d4f3574e | 2865 | if (step_resume_breakpoint == NULL |
d4f3574e SS |
2866 | && ecs->remove_breakpoints_on_following_step) |
2867 | { | |
2868 | ecs->remove_breakpoints_on_following_step = 0; | |
2869 | remove_breakpoints (); | |
2870 | breakpoints_inserted = 0; | |
2871 | } | |
d303a6c7 | 2872 | else if (!breakpoints_inserted && !ecs->another_trap) |
d4f3574e SS |
2873 | { |
2874 | breakpoints_failed = insert_breakpoints (); | |
2875 | if (breakpoints_failed) | |
2876 | { | |
2877 | stop_stepping (ecs); | |
2878 | return; | |
2879 | } | |
2880 | breakpoints_inserted = 1; | |
2881 | } | |
2882 | ||
2883 | trap_expected = ecs->another_trap; | |
2884 | ||
2885 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
2886 | specifies that such a signal should be delivered to the |
2887 | target program). | |
2888 | ||
2889 | Typically, this would occure when a user is debugging a | |
2890 | target monitor on a simulator: the target monitor sets a | |
2891 | breakpoint; the simulator encounters this break-point and | |
2892 | halts the simulation handing control to GDB; GDB, noteing | |
2893 | that the break-point isn't valid, returns control back to the | |
2894 | simulator; the simulator then delivers the hardware | |
2895 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
2896 | ||
2897 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
2898 | stop_signal = TARGET_SIGNAL_0; |
2899 | ||
d4f3574e SS |
2900 | |
2901 | resume (currently_stepping (ecs), stop_signal); | |
2902 | } | |
2903 | ||
488f131b | 2904 | prepare_to_wait (ecs); |
d4f3574e SS |
2905 | } |
2906 | ||
104c1213 JM |
2907 | /* This function normally comes after a resume, before |
2908 | handle_inferior_event exits. It takes care of any last bits of | |
2909 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 2910 | |
104c1213 JM |
2911 | static void |
2912 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 2913 | { |
104c1213 JM |
2914 | if (ecs->infwait_state == infwait_normal_state) |
2915 | { | |
2916 | overlay_cache_invalid = 1; | |
2917 | ||
2918 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
2919 | target_wait because they can be loaded from the target while |
2920 | in target_wait. This makes remote debugging a bit more | |
2921 | efficient for those targets that provide critical registers | |
2922 | as part of their normal status mechanism. */ | |
104c1213 JM |
2923 | |
2924 | registers_changed (); | |
39f77062 | 2925 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
2926 | ecs->wp = &(ecs->ws); |
2927 | } | |
2928 | /* This is the old end of the while loop. Let everybody know we | |
2929 | want to wait for the inferior some more and get called again | |
2930 | soon. */ | |
2931 | ecs->wait_some_more = 1; | |
c906108c | 2932 | } |
11cf8741 JM |
2933 | |
2934 | /* Print why the inferior has stopped. We always print something when | |
2935 | the inferior exits, or receives a signal. The rest of the cases are | |
2936 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
2937 | there should be a call to this function from handle_inferior_event() | |
2938 | each time stop_stepping() is called.*/ | |
2939 | static void | |
2940 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
2941 | { | |
2942 | switch (stop_reason) | |
2943 | { | |
2944 | case STOP_UNKNOWN: | |
2945 | /* We don't deal with these cases from handle_inferior_event() | |
2946 | yet. */ | |
2947 | break; | |
2948 | case END_STEPPING_RANGE: | |
2949 | /* We are done with a step/next/si/ni command. */ | |
2950 | /* For now print nothing. */ | |
fb40c209 | 2951 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 2952 | operation for n > 1 */ |
fb40c209 | 2953 | if (!step_multi || !stop_step) |
9dc5e2a9 | 2954 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2955 | ui_out_field_string (uiout, "reason", "end-stepping-range"); |
11cf8741 JM |
2956 | break; |
2957 | case BREAKPOINT_HIT: | |
2958 | /* We found a breakpoint. */ | |
2959 | /* For now print nothing. */ | |
2960 | break; | |
2961 | case SIGNAL_EXITED: | |
2962 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 2963 | annotate_signalled (); |
9dc5e2a9 | 2964 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2965 | ui_out_field_string (uiout, "reason", "exited-signalled"); |
8b93c638 JM |
2966 | ui_out_text (uiout, "\nProgram terminated with signal "); |
2967 | annotate_signal_name (); | |
488f131b JB |
2968 | ui_out_field_string (uiout, "signal-name", |
2969 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2970 | annotate_signal_name_end (); |
2971 | ui_out_text (uiout, ", "); | |
2972 | annotate_signal_string (); | |
488f131b JB |
2973 | ui_out_field_string (uiout, "signal-meaning", |
2974 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2975 | annotate_signal_string_end (); |
2976 | ui_out_text (uiout, ".\n"); | |
2977 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
2978 | break; |
2979 | case EXITED: | |
2980 | /* The inferior program is finished. */ | |
8b93c638 JM |
2981 | annotate_exited (stop_info); |
2982 | if (stop_info) | |
2983 | { | |
9dc5e2a9 | 2984 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2985 | ui_out_field_string (uiout, "reason", "exited"); |
8b93c638 | 2986 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
2987 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
2988 | (unsigned int) stop_info); | |
8b93c638 JM |
2989 | ui_out_text (uiout, ".\n"); |
2990 | } | |
2991 | else | |
2992 | { | |
9dc5e2a9 | 2993 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2994 | ui_out_field_string (uiout, "reason", "exited-normally"); |
8b93c638 JM |
2995 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
2996 | } | |
11cf8741 JM |
2997 | break; |
2998 | case SIGNAL_RECEIVED: | |
2999 | /* Signal received. The signal table tells us to print about | |
3000 | it. */ | |
8b93c638 JM |
3001 | annotate_signal (); |
3002 | ui_out_text (uiout, "\nProgram received signal "); | |
3003 | annotate_signal_name (); | |
84c6c83c KS |
3004 | if (ui_out_is_mi_like_p (uiout)) |
3005 | ui_out_field_string (uiout, "reason", "signal-received"); | |
488f131b JB |
3006 | ui_out_field_string (uiout, "signal-name", |
3007 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
3008 | annotate_signal_name_end (); |
3009 | ui_out_text (uiout, ", "); | |
3010 | annotate_signal_string (); | |
488f131b JB |
3011 | ui_out_field_string (uiout, "signal-meaning", |
3012 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
3013 | annotate_signal_string_end (); |
3014 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
3015 | break; |
3016 | default: | |
8e65ff28 AC |
3017 | internal_error (__FILE__, __LINE__, |
3018 | "print_stop_reason: unrecognized enum value"); | |
11cf8741 JM |
3019 | break; |
3020 | } | |
3021 | } | |
c906108c | 3022 | \f |
43ff13b4 | 3023 | |
c906108c SS |
3024 | /* Here to return control to GDB when the inferior stops for real. |
3025 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
3026 | ||
3027 | STOP_PRINT_FRAME nonzero means print the executing frame | |
3028 | (pc, function, args, file, line number and line text). | |
3029 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
3030 | attempting to insert breakpoints. */ | |
3031 | ||
3032 | void | |
96baa820 | 3033 | normal_stop (void) |
c906108c | 3034 | { |
73b65bb0 DJ |
3035 | struct target_waitstatus last; |
3036 | ptid_t last_ptid; | |
3037 | ||
3038 | get_last_target_status (&last_ptid, &last); | |
3039 | ||
c906108c SS |
3040 | /* As with the notification of thread events, we want to delay |
3041 | notifying the user that we've switched thread context until | |
3042 | the inferior actually stops. | |
3043 | ||
73b65bb0 DJ |
3044 | There's no point in saying anything if the inferior has exited. |
3045 | Note that SIGNALLED here means "exited with a signal", not | |
3046 | "received a signal". */ | |
488f131b | 3047 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
73b65bb0 DJ |
3048 | && target_has_execution |
3049 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
3050 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
3051 | { |
3052 | target_terminal_ours_for_output (); | |
c3f6f71d | 3053 | printf_filtered ("[Switching to %s]\n", |
39f77062 KB |
3054 | target_pid_or_tid_to_str (inferior_ptid)); |
3055 | previous_inferior_ptid = inferior_ptid; | |
c906108c | 3056 | } |
c906108c | 3057 | |
4fa8626c | 3058 | /* NOTE drow/2004-01-17: Is this still necessary? */ |
c906108c SS |
3059 | /* Make sure that the current_frame's pc is correct. This |
3060 | is a correction for setting up the frame info before doing | |
3061 | DECR_PC_AFTER_BREAK */ | |
b87efeee AC |
3062 | if (target_has_execution) |
3063 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to | |
3064 | DECR_PC_AFTER_BREAK, the program counter can change. Ask the | |
3065 | frame code to check for this and sort out any resultant mess. | |
3066 | DECR_PC_AFTER_BREAK needs to just go away. */ | |
2f107107 | 3067 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
c906108c | 3068 | |
c906108c SS |
3069 | if (target_has_execution && breakpoints_inserted) |
3070 | { | |
3071 | if (remove_breakpoints ()) | |
3072 | { | |
3073 | target_terminal_ours_for_output (); | |
3074 | printf_filtered ("Cannot remove breakpoints because "); | |
3075 | printf_filtered ("program is no longer writable.\n"); | |
3076 | printf_filtered ("It might be running in another process.\n"); | |
3077 | printf_filtered ("Further execution is probably impossible.\n"); | |
3078 | } | |
3079 | } | |
3080 | breakpoints_inserted = 0; | |
3081 | ||
3082 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3083 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3084 | ||
3085 | breakpoint_auto_delete (stop_bpstat); | |
3086 | ||
3087 | /* If an auto-display called a function and that got a signal, | |
3088 | delete that auto-display to avoid an infinite recursion. */ | |
3089 | ||
3090 | if (stopped_by_random_signal) | |
3091 | disable_current_display (); | |
3092 | ||
3093 | /* Don't print a message if in the middle of doing a "step n" | |
3094 | operation for n > 1 */ | |
3095 | if (step_multi && stop_step) | |
3096 | goto done; | |
3097 | ||
3098 | target_terminal_ours (); | |
3099 | ||
5913bcb0 AC |
3100 | /* Look up the hook_stop and run it (CLI internally handles problem |
3101 | of stop_command's pre-hook not existing). */ | |
3102 | if (stop_command) | |
3103 | catch_errors (hook_stop_stub, stop_command, | |
3104 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
3105 | |
3106 | if (!target_has_stack) | |
3107 | { | |
3108 | ||
3109 | goto done; | |
3110 | } | |
3111 | ||
3112 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3113 | and current location is based on that. | |
3114 | Don't do this on return from a stack dummy routine, | |
3115 | or if the program has exited. */ | |
3116 | ||
3117 | if (!stop_stack_dummy) | |
3118 | { | |
0f7d239c | 3119 | select_frame (get_current_frame ()); |
c906108c SS |
3120 | |
3121 | /* Print current location without a level number, if | |
c5aa993b JM |
3122 | we have changed functions or hit a breakpoint. |
3123 | Print source line if we have one. | |
3124 | bpstat_print() contains the logic deciding in detail | |
3125 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3126 | |
6e7f8b9c | 3127 | if (stop_print_frame && deprecated_selected_frame) |
c906108c SS |
3128 | { |
3129 | int bpstat_ret; | |
3130 | int source_flag; | |
917317f4 | 3131 | int do_frame_printing = 1; |
c906108c SS |
3132 | |
3133 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3134 | switch (bpstat_ret) |
3135 | { | |
3136 | case PRINT_UNKNOWN: | |
aa0cd9c1 AC |
3137 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
3138 | (or should) carry around the function and does (or | |
3139 | should) use that when doing a frame comparison. */ | |
917317f4 | 3140 | if (stop_step |
aa0cd9c1 AC |
3141 | && frame_id_eq (step_frame_id, |
3142 | get_frame_id (get_current_frame ())) | |
917317f4 | 3143 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3144 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3145 | else |
488f131b | 3146 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3147 | break; |
3148 | case PRINT_SRC_AND_LOC: | |
488f131b | 3149 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3150 | break; |
3151 | case PRINT_SRC_ONLY: | |
c5394b80 | 3152 | source_flag = SRC_LINE; |
917317f4 JM |
3153 | break; |
3154 | case PRINT_NOTHING: | |
488f131b | 3155 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3156 | do_frame_printing = 0; |
3157 | break; | |
3158 | default: | |
488f131b | 3159 | internal_error (__FILE__, __LINE__, "Unknown value."); |
917317f4 | 3160 | } |
fb40c209 | 3161 | /* For mi, have the same behavior every time we stop: |
488f131b | 3162 | print everything but the source line. */ |
9dc5e2a9 | 3163 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3164 | source_flag = LOC_AND_ADDRESS; |
c906108c | 3165 | |
9dc5e2a9 | 3166 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 | 3167 | ui_out_field_int (uiout, "thread-id", |
488f131b | 3168 | pid_to_thread_id (inferior_ptid)); |
c906108c SS |
3169 | /* The behavior of this routine with respect to the source |
3170 | flag is: | |
c5394b80 JM |
3171 | SRC_LINE: Print only source line |
3172 | LOCATION: Print only location | |
3173 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3174 | if (do_frame_printing) |
0faf0076 | 3175 | print_stack_frame (get_selected_frame (), 0, source_flag); |
c906108c SS |
3176 | |
3177 | /* Display the auto-display expressions. */ | |
3178 | do_displays (); | |
3179 | } | |
3180 | } | |
3181 | ||
3182 | /* Save the function value return registers, if we care. | |
3183 | We might be about to restore their previous contents. */ | |
3184 | if (proceed_to_finish) | |
72cec141 AC |
3185 | /* NB: The copy goes through to the target picking up the value of |
3186 | all the registers. */ | |
3187 | regcache_cpy (stop_registers, current_regcache); | |
c906108c SS |
3188 | |
3189 | if (stop_stack_dummy) | |
3190 | { | |
dbe9fe58 AC |
3191 | /* Pop the empty frame that contains the stack dummy. POP_FRAME |
3192 | ends with a setting of the current frame, so we can use that | |
3193 | next. */ | |
3194 | frame_pop (get_current_frame ()); | |
c906108c | 3195 | /* Set stop_pc to what it was before we called the function. |
c5aa993b JM |
3196 | Can't rely on restore_inferior_status because that only gets |
3197 | called if we don't stop in the called function. */ | |
c906108c | 3198 | stop_pc = read_pc (); |
0f7d239c | 3199 | select_frame (get_current_frame ()); |
c906108c SS |
3200 | } |
3201 | ||
c906108c SS |
3202 | done: |
3203 | annotate_stopped (); | |
7a464420 | 3204 | observer_notify_normal_stop (stop_bpstat); |
c906108c SS |
3205 | } |
3206 | ||
3207 | static int | |
96baa820 | 3208 | hook_stop_stub (void *cmd) |
c906108c | 3209 | { |
5913bcb0 | 3210 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3211 | return (0); |
3212 | } | |
3213 | \f | |
c5aa993b | 3214 | int |
96baa820 | 3215 | signal_stop_state (int signo) |
c906108c SS |
3216 | { |
3217 | return signal_stop[signo]; | |
3218 | } | |
3219 | ||
c5aa993b | 3220 | int |
96baa820 | 3221 | signal_print_state (int signo) |
c906108c SS |
3222 | { |
3223 | return signal_print[signo]; | |
3224 | } | |
3225 | ||
c5aa993b | 3226 | int |
96baa820 | 3227 | signal_pass_state (int signo) |
c906108c SS |
3228 | { |
3229 | return signal_program[signo]; | |
3230 | } | |
3231 | ||
488f131b | 3232 | int |
7bda5e4a | 3233 | signal_stop_update (int signo, int state) |
d4f3574e SS |
3234 | { |
3235 | int ret = signal_stop[signo]; | |
3236 | signal_stop[signo] = state; | |
3237 | return ret; | |
3238 | } | |
3239 | ||
488f131b | 3240 | int |
7bda5e4a | 3241 | signal_print_update (int signo, int state) |
d4f3574e SS |
3242 | { |
3243 | int ret = signal_print[signo]; | |
3244 | signal_print[signo] = state; | |
3245 | return ret; | |
3246 | } | |
3247 | ||
488f131b | 3248 | int |
7bda5e4a | 3249 | signal_pass_update (int signo, int state) |
d4f3574e SS |
3250 | { |
3251 | int ret = signal_program[signo]; | |
3252 | signal_program[signo] = state; | |
3253 | return ret; | |
3254 | } | |
3255 | ||
c906108c | 3256 | static void |
96baa820 | 3257 | sig_print_header (void) |
c906108c SS |
3258 | { |
3259 | printf_filtered ("\ | |
3260 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3261 | } | |
3262 | ||
3263 | static void | |
96baa820 | 3264 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3265 | { |
3266 | char *name = target_signal_to_name (oursig); | |
3267 | int name_padding = 13 - strlen (name); | |
96baa820 | 3268 | |
c906108c SS |
3269 | if (name_padding <= 0) |
3270 | name_padding = 0; | |
3271 | ||
3272 | printf_filtered ("%s", name); | |
488f131b | 3273 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
3274 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3275 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3276 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3277 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3278 | } | |
3279 | ||
3280 | /* Specify how various signals in the inferior should be handled. */ | |
3281 | ||
3282 | static void | |
96baa820 | 3283 | handle_command (char *args, int from_tty) |
c906108c SS |
3284 | { |
3285 | char **argv; | |
3286 | int digits, wordlen; | |
3287 | int sigfirst, signum, siglast; | |
3288 | enum target_signal oursig; | |
3289 | int allsigs; | |
3290 | int nsigs; | |
3291 | unsigned char *sigs; | |
3292 | struct cleanup *old_chain; | |
3293 | ||
3294 | if (args == NULL) | |
3295 | { | |
3296 | error_no_arg ("signal to handle"); | |
3297 | } | |
3298 | ||
3299 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3300 | ||
3301 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3302 | sigs = (unsigned char *) alloca (nsigs); | |
3303 | memset (sigs, 0, nsigs); | |
3304 | ||
3305 | /* Break the command line up into args. */ | |
3306 | ||
3307 | argv = buildargv (args); | |
3308 | if (argv == NULL) | |
3309 | { | |
3310 | nomem (0); | |
3311 | } | |
7a292a7a | 3312 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3313 | |
3314 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3315 | actions. Signal numbers and signal names may be interspersed with | |
3316 | actions, with the actions being performed for all signals cumulatively | |
3317 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3318 | ||
3319 | while (*argv != NULL) | |
3320 | { | |
3321 | wordlen = strlen (*argv); | |
3322 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3323 | {; | |
3324 | } | |
3325 | allsigs = 0; | |
3326 | sigfirst = siglast = -1; | |
3327 | ||
3328 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3329 | { | |
3330 | /* Apply action to all signals except those used by the | |
3331 | debugger. Silently skip those. */ | |
3332 | allsigs = 1; | |
3333 | sigfirst = 0; | |
3334 | siglast = nsigs - 1; | |
3335 | } | |
3336 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3337 | { | |
3338 | SET_SIGS (nsigs, sigs, signal_stop); | |
3339 | SET_SIGS (nsigs, sigs, signal_print); | |
3340 | } | |
3341 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3342 | { | |
3343 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3344 | } | |
3345 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3346 | { | |
3347 | SET_SIGS (nsigs, sigs, signal_print); | |
3348 | } | |
3349 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3350 | { | |
3351 | SET_SIGS (nsigs, sigs, signal_program); | |
3352 | } | |
3353 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3354 | { | |
3355 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3356 | } | |
3357 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3358 | { | |
3359 | SET_SIGS (nsigs, sigs, signal_program); | |
3360 | } | |
3361 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3362 | { | |
3363 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3364 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3365 | } | |
3366 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3367 | { | |
3368 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3369 | } | |
3370 | else if (digits > 0) | |
3371 | { | |
3372 | /* It is numeric. The numeric signal refers to our own | |
3373 | internal signal numbering from target.h, not to host/target | |
3374 | signal number. This is a feature; users really should be | |
3375 | using symbolic names anyway, and the common ones like | |
3376 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3377 | ||
3378 | sigfirst = siglast = (int) | |
3379 | target_signal_from_command (atoi (*argv)); | |
3380 | if ((*argv)[digits] == '-') | |
3381 | { | |
3382 | siglast = (int) | |
3383 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3384 | } | |
3385 | if (sigfirst > siglast) | |
3386 | { | |
3387 | /* Bet he didn't figure we'd think of this case... */ | |
3388 | signum = sigfirst; | |
3389 | sigfirst = siglast; | |
3390 | siglast = signum; | |
3391 | } | |
3392 | } | |
3393 | else | |
3394 | { | |
3395 | oursig = target_signal_from_name (*argv); | |
3396 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3397 | { | |
3398 | sigfirst = siglast = (int) oursig; | |
3399 | } | |
3400 | else | |
3401 | { | |
3402 | /* Not a number and not a recognized flag word => complain. */ | |
3403 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3404 | } | |
3405 | } | |
3406 | ||
3407 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3408 | which signals to apply actions to. */ |
c906108c SS |
3409 | |
3410 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3411 | { | |
3412 | switch ((enum target_signal) signum) | |
3413 | { | |
3414 | case TARGET_SIGNAL_TRAP: | |
3415 | case TARGET_SIGNAL_INT: | |
3416 | if (!allsigs && !sigs[signum]) | |
3417 | { | |
3418 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 3419 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
3420 | { |
3421 | sigs[signum] = 1; | |
3422 | } | |
3423 | else | |
3424 | { | |
3425 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3426 | gdb_flush (gdb_stdout); | |
3427 | } | |
3428 | } | |
3429 | break; | |
3430 | case TARGET_SIGNAL_0: | |
3431 | case TARGET_SIGNAL_DEFAULT: | |
3432 | case TARGET_SIGNAL_UNKNOWN: | |
3433 | /* Make sure that "all" doesn't print these. */ | |
3434 | break; | |
3435 | default: | |
3436 | sigs[signum] = 1; | |
3437 | break; | |
3438 | } | |
3439 | } | |
3440 | ||
3441 | argv++; | |
3442 | } | |
3443 | ||
39f77062 | 3444 | target_notice_signals (inferior_ptid); |
c906108c SS |
3445 | |
3446 | if (from_tty) | |
3447 | { | |
3448 | /* Show the results. */ | |
3449 | sig_print_header (); | |
3450 | for (signum = 0; signum < nsigs; signum++) | |
3451 | { | |
3452 | if (sigs[signum]) | |
3453 | { | |
3454 | sig_print_info (signum); | |
3455 | } | |
3456 | } | |
3457 | } | |
3458 | ||
3459 | do_cleanups (old_chain); | |
3460 | } | |
3461 | ||
3462 | static void | |
96baa820 | 3463 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3464 | { |
3465 | char **argv; | |
3466 | struct cleanup *old_chain; | |
3467 | ||
3468 | /* Break the command line up into args. */ | |
3469 | ||
3470 | argv = buildargv (args); | |
3471 | if (argv == NULL) | |
3472 | { | |
3473 | nomem (0); | |
3474 | } | |
7a292a7a | 3475 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3476 | if (argv[1] != (char *) NULL) |
3477 | { | |
3478 | char *argBuf; | |
3479 | int bufLen; | |
3480 | ||
3481 | bufLen = strlen (argv[0]) + 20; | |
3482 | argBuf = (char *) xmalloc (bufLen); | |
3483 | if (argBuf) | |
3484 | { | |
3485 | int validFlag = 1; | |
3486 | enum target_signal oursig; | |
3487 | ||
3488 | oursig = target_signal_from_name (argv[0]); | |
3489 | memset (argBuf, 0, bufLen); | |
3490 | if (strcmp (argv[1], "Q") == 0) | |
3491 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3492 | else | |
3493 | { | |
3494 | if (strcmp (argv[1], "s") == 0) | |
3495 | { | |
3496 | if (!signal_stop[oursig]) | |
3497 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3498 | else | |
3499 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3500 | } | |
3501 | else if (strcmp (argv[1], "i") == 0) | |
3502 | { | |
3503 | if (!signal_program[oursig]) | |
3504 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3505 | else | |
3506 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3507 | } | |
3508 | else if (strcmp (argv[1], "r") == 0) | |
3509 | { | |
3510 | if (!signal_print[oursig]) | |
3511 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3512 | else | |
3513 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3514 | } | |
3515 | else | |
3516 | validFlag = 0; | |
3517 | } | |
3518 | if (validFlag) | |
3519 | handle_command (argBuf, from_tty); | |
3520 | else | |
3521 | printf_filtered ("Invalid signal handling flag.\n"); | |
3522 | if (argBuf) | |
b8c9b27d | 3523 | xfree (argBuf); |
c906108c SS |
3524 | } |
3525 | } | |
3526 | do_cleanups (old_chain); | |
3527 | } | |
3528 | ||
3529 | /* Print current contents of the tables set by the handle command. | |
3530 | It is possible we should just be printing signals actually used | |
3531 | by the current target (but for things to work right when switching | |
3532 | targets, all signals should be in the signal tables). */ | |
3533 | ||
3534 | static void | |
96baa820 | 3535 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3536 | { |
3537 | enum target_signal oursig; | |
3538 | sig_print_header (); | |
3539 | ||
3540 | if (signum_exp) | |
3541 | { | |
3542 | /* First see if this is a symbol name. */ | |
3543 | oursig = target_signal_from_name (signum_exp); | |
3544 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3545 | { | |
3546 | /* No, try numeric. */ | |
3547 | oursig = | |
bb518678 | 3548 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3549 | } |
3550 | sig_print_info (oursig); | |
3551 | return; | |
3552 | } | |
3553 | ||
3554 | printf_filtered ("\n"); | |
3555 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3556 | for (oursig = TARGET_SIGNAL_FIRST; | |
3557 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3558 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3559 | { | |
3560 | QUIT; | |
3561 | ||
3562 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 3563 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
3564 | sig_print_info (oursig); |
3565 | } | |
3566 | ||
3567 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3568 | } | |
3569 | \f | |
7a292a7a SS |
3570 | struct inferior_status |
3571 | { | |
3572 | enum target_signal stop_signal; | |
3573 | CORE_ADDR stop_pc; | |
3574 | bpstat stop_bpstat; | |
3575 | int stop_step; | |
3576 | int stop_stack_dummy; | |
3577 | int stopped_by_random_signal; | |
3578 | int trap_expected; | |
3579 | CORE_ADDR step_range_start; | |
3580 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 3581 | struct frame_id step_frame_id; |
5fbbeb29 | 3582 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3583 | CORE_ADDR step_resume_break_address; |
3584 | int stop_after_trap; | |
c0236d92 | 3585 | int stop_soon; |
72cec141 | 3586 | struct regcache *stop_registers; |
7a292a7a SS |
3587 | |
3588 | /* These are here because if call_function_by_hand has written some | |
3589 | registers and then decides to call error(), we better not have changed | |
3590 | any registers. */ | |
72cec141 | 3591 | struct regcache *registers; |
7a292a7a | 3592 | |
101dcfbe AC |
3593 | /* A frame unique identifier. */ |
3594 | struct frame_id selected_frame_id; | |
3595 | ||
7a292a7a SS |
3596 | int breakpoint_proceeded; |
3597 | int restore_stack_info; | |
3598 | int proceed_to_finish; | |
3599 | }; | |
3600 | ||
7a292a7a | 3601 | void |
96baa820 JM |
3602 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3603 | LONGEST val) | |
7a292a7a | 3604 | { |
12c266ea | 3605 | int size = DEPRECATED_REGISTER_RAW_SIZE (regno); |
7a292a7a SS |
3606 | void *buf = alloca (size); |
3607 | store_signed_integer (buf, size, val); | |
0818c12a | 3608 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
3609 | } |
3610 | ||
c906108c SS |
3611 | /* Save all of the information associated with the inferior<==>gdb |
3612 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3613 | (defined in inferior.h). */ | |
3614 | ||
7a292a7a | 3615 | struct inferior_status * |
96baa820 | 3616 | save_inferior_status (int restore_stack_info) |
c906108c | 3617 | { |
72cec141 | 3618 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 3619 | |
c906108c SS |
3620 | inf_status->stop_signal = stop_signal; |
3621 | inf_status->stop_pc = stop_pc; | |
3622 | inf_status->stop_step = stop_step; | |
3623 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3624 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3625 | inf_status->trap_expected = trap_expected; | |
3626 | inf_status->step_range_start = step_range_start; | |
3627 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 3628 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
3629 | inf_status->step_over_calls = step_over_calls; |
3630 | inf_status->stop_after_trap = stop_after_trap; | |
c0236d92 | 3631 | inf_status->stop_soon = stop_soon; |
c906108c SS |
3632 | /* Save original bpstat chain here; replace it with copy of chain. |
3633 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3634 | hand them back the original chain when restore_inferior_status is |
3635 | called. */ | |
c906108c SS |
3636 | inf_status->stop_bpstat = stop_bpstat; |
3637 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3638 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3639 | inf_status->restore_stack_info = restore_stack_info; | |
3640 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3641 | |
72cec141 | 3642 | inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers); |
c906108c | 3643 | |
72cec141 | 3644 | inf_status->registers = regcache_dup (current_regcache); |
c906108c | 3645 | |
7a424e99 | 3646 | inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame); |
7a292a7a | 3647 | return inf_status; |
c906108c SS |
3648 | } |
3649 | ||
c906108c | 3650 | static int |
96baa820 | 3651 | restore_selected_frame (void *args) |
c906108c | 3652 | { |
488f131b | 3653 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 3654 | struct frame_info *frame; |
c906108c | 3655 | |
101dcfbe | 3656 | frame = frame_find_by_id (*fid); |
c906108c | 3657 | |
aa0cd9c1 AC |
3658 | /* If inf_status->selected_frame_id is NULL, there was no previously |
3659 | selected frame. */ | |
101dcfbe | 3660 | if (frame == NULL) |
c906108c SS |
3661 | { |
3662 | warning ("Unable to restore previously selected frame.\n"); | |
3663 | return 0; | |
3664 | } | |
3665 | ||
0f7d239c | 3666 | select_frame (frame); |
c906108c SS |
3667 | |
3668 | return (1); | |
3669 | } | |
3670 | ||
3671 | void | |
96baa820 | 3672 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3673 | { |
3674 | stop_signal = inf_status->stop_signal; | |
3675 | stop_pc = inf_status->stop_pc; | |
3676 | stop_step = inf_status->stop_step; | |
3677 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3678 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3679 | trap_expected = inf_status->trap_expected; | |
3680 | step_range_start = inf_status->step_range_start; | |
3681 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 3682 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
3683 | step_over_calls = inf_status->step_over_calls; |
3684 | stop_after_trap = inf_status->stop_after_trap; | |
c0236d92 | 3685 | stop_soon = inf_status->stop_soon; |
c906108c SS |
3686 | bpstat_clear (&stop_bpstat); |
3687 | stop_bpstat = inf_status->stop_bpstat; | |
3688 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3689 | proceed_to_finish = inf_status->proceed_to_finish; | |
3690 | ||
72cec141 AC |
3691 | /* FIXME: Is the restore of stop_registers always needed. */ |
3692 | regcache_xfree (stop_registers); | |
3693 | stop_registers = inf_status->stop_registers; | |
c906108c SS |
3694 | |
3695 | /* The inferior can be gone if the user types "print exit(0)" | |
3696 | (and perhaps other times). */ | |
3697 | if (target_has_execution) | |
72cec141 AC |
3698 | /* NB: The register write goes through to the target. */ |
3699 | regcache_cpy (current_regcache, inf_status->registers); | |
3700 | regcache_xfree (inf_status->registers); | |
c906108c | 3701 | |
c906108c SS |
3702 | /* FIXME: If we are being called after stopping in a function which |
3703 | is called from gdb, we should not be trying to restore the | |
3704 | selected frame; it just prints a spurious error message (The | |
3705 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3706 | clobbers the stack)). In fact, should we be restoring the | |
3707 | inferior status at all in that case? . */ | |
3708 | ||
3709 | if (target_has_stack && inf_status->restore_stack_info) | |
3710 | { | |
c906108c | 3711 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
3712 | walking the stack might encounter a garbage pointer and |
3713 | error() trying to dereference it. */ | |
488f131b JB |
3714 | if (catch_errors |
3715 | (restore_selected_frame, &inf_status->selected_frame_id, | |
3716 | "Unable to restore previously selected frame:\n", | |
3717 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
3718 | /* Error in restoring the selected frame. Select the innermost |
3719 | frame. */ | |
0f7d239c | 3720 | select_frame (get_current_frame ()); |
c906108c SS |
3721 | |
3722 | } | |
c906108c | 3723 | |
72cec141 | 3724 | xfree (inf_status); |
7a292a7a | 3725 | } |
c906108c | 3726 | |
74b7792f AC |
3727 | static void |
3728 | do_restore_inferior_status_cleanup (void *sts) | |
3729 | { | |
3730 | restore_inferior_status (sts); | |
3731 | } | |
3732 | ||
3733 | struct cleanup * | |
3734 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
3735 | { | |
3736 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
3737 | } | |
3738 | ||
c906108c | 3739 | void |
96baa820 | 3740 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3741 | { |
3742 | /* See save_inferior_status for info on stop_bpstat. */ | |
3743 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 AC |
3744 | regcache_xfree (inf_status->registers); |
3745 | regcache_xfree (inf_status->stop_registers); | |
3746 | xfree (inf_status); | |
7a292a7a SS |
3747 | } |
3748 | ||
47932f85 DJ |
3749 | int |
3750 | inferior_has_forked (int pid, int *child_pid) | |
3751 | { | |
3752 | struct target_waitstatus last; | |
3753 | ptid_t last_ptid; | |
3754 | ||
3755 | get_last_target_status (&last_ptid, &last); | |
3756 | ||
3757 | if (last.kind != TARGET_WAITKIND_FORKED) | |
3758 | return 0; | |
3759 | ||
3760 | if (ptid_get_pid (last_ptid) != pid) | |
3761 | return 0; | |
3762 | ||
3763 | *child_pid = last.value.related_pid; | |
3764 | return 1; | |
3765 | } | |
3766 | ||
3767 | int | |
3768 | inferior_has_vforked (int pid, int *child_pid) | |
3769 | { | |
3770 | struct target_waitstatus last; | |
3771 | ptid_t last_ptid; | |
3772 | ||
3773 | get_last_target_status (&last_ptid, &last); | |
3774 | ||
3775 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
3776 | return 0; | |
3777 | ||
3778 | if (ptid_get_pid (last_ptid) != pid) | |
3779 | return 0; | |
3780 | ||
3781 | *child_pid = last.value.related_pid; | |
3782 | return 1; | |
3783 | } | |
3784 | ||
3785 | int | |
3786 | inferior_has_execd (int pid, char **execd_pathname) | |
3787 | { | |
3788 | struct target_waitstatus last; | |
3789 | ptid_t last_ptid; | |
3790 | ||
3791 | get_last_target_status (&last_ptid, &last); | |
3792 | ||
3793 | if (last.kind != TARGET_WAITKIND_EXECD) | |
3794 | return 0; | |
3795 | ||
3796 | if (ptid_get_pid (last_ptid) != pid) | |
3797 | return 0; | |
3798 | ||
3799 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
3800 | return 1; | |
3801 | } | |
3802 | ||
ca6724c1 KB |
3803 | /* Oft used ptids */ |
3804 | ptid_t null_ptid; | |
3805 | ptid_t minus_one_ptid; | |
3806 | ||
3807 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 3808 | |
ca6724c1 KB |
3809 | ptid_t |
3810 | ptid_build (int pid, long lwp, long tid) | |
3811 | { | |
3812 | ptid_t ptid; | |
3813 | ||
3814 | ptid.pid = pid; | |
3815 | ptid.lwp = lwp; | |
3816 | ptid.tid = tid; | |
3817 | return ptid; | |
3818 | } | |
3819 | ||
3820 | /* Create a ptid from just a pid. */ | |
3821 | ||
3822 | ptid_t | |
3823 | pid_to_ptid (int pid) | |
3824 | { | |
3825 | return ptid_build (pid, 0, 0); | |
3826 | } | |
3827 | ||
3828 | /* Fetch the pid (process id) component from a ptid. */ | |
3829 | ||
3830 | int | |
3831 | ptid_get_pid (ptid_t ptid) | |
3832 | { | |
3833 | return ptid.pid; | |
3834 | } | |
3835 | ||
3836 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
3837 | ||
3838 | long | |
3839 | ptid_get_lwp (ptid_t ptid) | |
3840 | { | |
3841 | return ptid.lwp; | |
3842 | } | |
3843 | ||
3844 | /* Fetch the tid (thread id) component from a ptid. */ | |
3845 | ||
3846 | long | |
3847 | ptid_get_tid (ptid_t ptid) | |
3848 | { | |
3849 | return ptid.tid; | |
3850 | } | |
3851 | ||
3852 | /* ptid_equal() is used to test equality of two ptids. */ | |
3853 | ||
3854 | int | |
3855 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
3856 | { | |
3857 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 3858 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
3859 | } |
3860 | ||
3861 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
3862 | to restore the inferior_ptid value saved in a call to | |
3863 | save_inferior_ptid(). */ | |
ce696e05 KB |
3864 | |
3865 | static void | |
3866 | restore_inferior_ptid (void *arg) | |
3867 | { | |
3868 | ptid_t *saved_ptid_ptr = arg; | |
3869 | inferior_ptid = *saved_ptid_ptr; | |
3870 | xfree (arg); | |
3871 | } | |
3872 | ||
3873 | /* Save the value of inferior_ptid so that it may be restored by a | |
3874 | later call to do_cleanups(). Returns the struct cleanup pointer | |
3875 | needed for later doing the cleanup. */ | |
3876 | ||
3877 | struct cleanup * | |
3878 | save_inferior_ptid (void) | |
3879 | { | |
3880 | ptid_t *saved_ptid_ptr; | |
3881 | ||
3882 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
3883 | *saved_ptid_ptr = inferior_ptid; | |
3884 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
3885 | } | |
c5aa993b | 3886 | \f |
488f131b | 3887 | |
7a292a7a | 3888 | static void |
96baa820 | 3889 | build_infrun (void) |
7a292a7a | 3890 | { |
72cec141 | 3891 | stop_registers = regcache_xmalloc (current_gdbarch); |
7a292a7a | 3892 | } |
c906108c | 3893 | |
c906108c | 3894 | void |
96baa820 | 3895 | _initialize_infrun (void) |
c906108c | 3896 | { |
52f0bd74 AC |
3897 | int i; |
3898 | int numsigs; | |
c906108c SS |
3899 | struct cmd_list_element *c; |
3900 | ||
046a4708 AC |
3901 | DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers); |
3902 | deprecated_register_gdbarch_swap (NULL, 0, build_infrun); | |
0f71a2f6 | 3903 | |
c906108c SS |
3904 | add_info ("signals", signals_info, |
3905 | "What debugger does when program gets various signals.\n\ | |
3906 | Specify a signal as argument to print info on that signal only."); | |
3907 | add_info_alias ("handle", "signals", 0); | |
3908 | ||
3909 | add_com ("handle", class_run, handle_command, | |
3910 | concat ("Specify how to handle a signal.\n\ | |
3911 | Args are signals and actions to apply to those signals.\n\ | |
3912 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3913 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3914 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3915 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3916 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
3917 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
3918 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3919 | Print means print a message if this signal happens.\n\ | |
3920 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3921 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3922 | Pass and Stop may be combined.", NULL)); | |
3923 | if (xdb_commands) | |
3924 | { | |
3925 | add_com ("lz", class_info, signals_info, | |
3926 | "What debugger does when program gets various signals.\n\ | |
3927 | Specify a signal as argument to print info on that signal only."); | |
3928 | add_com ("z", class_run, xdb_handle_command, | |
3929 | concat ("Specify how to handle a signal.\n\ | |
3930 | Args are signals and actions to apply to those signals.\n\ | |
3931 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3932 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3933 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3934 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3935 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\ |
c906108c SS |
3936 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
3937 | nopass), \"Q\" (noprint)\n\ | |
3938 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3939 | Print means print a message if this signal happens.\n\ | |
3940 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3941 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3942 | Pass and Stop may be combined.", NULL)); | |
3943 | } | |
3944 | ||
3945 | if (!dbx_commands) | |
488f131b JB |
3946 | stop_command = |
3947 | 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 |
3948 | This allows you to set a list of commands to be run each time execution\n\ |
3949 | of the program stops.", &cmdlist); | |
3950 | ||
3951 | numsigs = (int) TARGET_SIGNAL_LAST; | |
488f131b | 3952 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
3953 | signal_print = (unsigned char *) |
3954 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
3955 | signal_program = (unsigned char *) | |
3956 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
3957 | for (i = 0; i < numsigs; i++) | |
3958 | { | |
3959 | signal_stop[i] = 1; | |
3960 | signal_print[i] = 1; | |
3961 | signal_program[i] = 1; | |
3962 | } | |
3963 | ||
3964 | /* Signals caused by debugger's own actions | |
3965 | should not be given to the program afterwards. */ | |
3966 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
3967 | signal_program[TARGET_SIGNAL_INT] = 0; | |
3968 | ||
3969 | /* Signals that are not errors should not normally enter the debugger. */ | |
3970 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
3971 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
3972 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
3973 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
3974 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
3975 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
3976 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
3977 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
3978 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
3979 | signal_print[TARGET_SIGNAL_IO] = 0; | |
3980 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
3981 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
3982 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
3983 | signal_print[TARGET_SIGNAL_URG] = 0; | |
3984 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
3985 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
3986 | ||
cd0fc7c3 SS |
3987 | /* These signals are used internally by user-level thread |
3988 | implementations. (See signal(5) on Solaris.) Like the above | |
3989 | signals, a healthy program receives and handles them as part of | |
3990 | its normal operation. */ | |
3991 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
3992 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
3993 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
3994 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
3995 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
3996 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
3997 | ||
c906108c SS |
3998 | #ifdef SOLIB_ADD |
3999 | add_show_from_set | |
4000 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, | |
4001 | (char *) &stop_on_solib_events, | |
4002 | "Set stopping for shared library events.\n\ | |
4003 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
4004 | notifies gdb of shared library events. The most common event of interest\n\ | |
488f131b | 4005 | to the user would be loading/unloading of a new library.\n", &setlist), &showlist); |
c906108c SS |
4006 | #endif |
4007 | ||
4008 | c = add_set_enum_cmd ("follow-fork-mode", | |
4009 | class_run, | |
488f131b | 4010 | follow_fork_mode_kind_names, &follow_fork_mode_string, |
c906108c SS |
4011 | "Set debugger response to a program call of fork \ |
4012 | or vfork.\n\ | |
4013 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
4014 | parent - the original process is debugged after a fork\n\ | |
4015 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 4016 | The unfollowed process will continue to run.\n\ |
488f131b | 4017 | By default, the debugger will follow the parent process.", &setlist); |
c906108c SS |
4018 | add_show_from_set (c, &showlist); |
4019 | ||
488f131b | 4020 | c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */ |
1ed2a135 | 4021 | &scheduler_mode, /* current mode */ |
c906108c SS |
4022 | "Set mode for locking scheduler during execution.\n\ |
4023 | off == no locking (threads may preempt at any time)\n\ | |
4024 | on == full locking (no thread except the current thread may run)\n\ | |
4025 | step == scheduler locked during every single-step operation.\n\ | |
4026 | In this mode, no other thread may run during a step command.\n\ | |
488f131b | 4027 | Other threads may run while stepping over a function call ('next').", &setlist); |
c906108c | 4028 | |
9f60d481 | 4029 | set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */ |
c906108c | 4030 | add_show_from_set (c, &showlist); |
5fbbeb29 CF |
4031 | |
4032 | c = add_set_cmd ("step-mode", class_run, | |
488f131b JB |
4033 | var_boolean, (char *) &step_stop_if_no_debug, |
4034 | "Set mode of the step operation. When set, doing a step over a\n\ | |
5fbbeb29 CF |
4035 | function without debug line information will stop at the first\n\ |
4036 | instruction of that function. Otherwise, the function is skipped and\n\ | |
488f131b | 4037 | the step command stops at a different source line.", &setlist); |
5fbbeb29 | 4038 | add_show_from_set (c, &showlist); |
ca6724c1 KB |
4039 | |
4040 | /* ptid initializations */ | |
4041 | null_ptid = ptid_build (0, 0, 0); | |
4042 | minus_one_ptid = ptid_build (-1, 0, 0); | |
4043 | inferior_ptid = null_ptid; | |
4044 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 4045 | } |