]>
Commit | Line | Data |
---|---|---|
ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c AC |
3 | |
4 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, | |
c6f0559b AC |
5 | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free |
6 | Software Foundation, Inc. | |
c906108c | 7 | |
c5aa993b | 8 | This file is part of GDB. |
c906108c | 9 | |
c5aa993b JM |
10 | This program is free software; you can redistribute it and/or modify |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2 of the License, or | |
13 | (at your option) any later version. | |
c906108c | 14 | |
c5aa993b JM |
15 | This program is distributed in the hope that it will be useful, |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
c906108c | 19 | |
c5aa993b JM |
20 | You should have received a copy of the GNU General Public License |
21 | along with this program; if not, write to the Free Software | |
22 | Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
24 | |
25 | #include "defs.h" | |
26 | #include "gdb_string.h" | |
27 | #include <ctype.h> | |
28 | #include "symtab.h" | |
29 | #include "frame.h" | |
30 | #include "inferior.h" | |
31 | #include "breakpoint.h" | |
03f2053f | 32 | #include "gdb_wait.h" |
c906108c SS |
33 | #include "gdbcore.h" |
34 | #include "gdbcmd.h" | |
210661e7 | 35 | #include "cli/cli-script.h" |
c906108c SS |
36 | #include "target.h" |
37 | #include "gdbthread.h" | |
38 | #include "annotate.h" | |
1adeb98a | 39 | #include "symfile.h" |
7a292a7a | 40 | #include "top.h" |
c906108c | 41 | #include <signal.h> |
2acceee2 | 42 | #include "inf-loop.h" |
4e052eda | 43 | #include "regcache.h" |
fd0407d6 | 44 | #include "value.h" |
06600e06 | 45 | #include "observer.h" |
f636b87d | 46 | #include "language.h" |
9f976b41 | 47 | #include "gdb_assert.h" |
c906108c SS |
48 | |
49 | /* Prototypes for local functions */ | |
50 | ||
96baa820 | 51 | static void signals_info (char *, int); |
c906108c | 52 | |
96baa820 | 53 | static void handle_command (char *, int); |
c906108c | 54 | |
96baa820 | 55 | static void sig_print_info (enum target_signal); |
c906108c | 56 | |
96baa820 | 57 | static void sig_print_header (void); |
c906108c | 58 | |
74b7792f | 59 | static void resume_cleanups (void *); |
c906108c | 60 | |
96baa820 | 61 | static int hook_stop_stub (void *); |
c906108c | 62 | |
96baa820 JM |
63 | static int restore_selected_frame (void *); |
64 | ||
65 | static void build_infrun (void); | |
66 | ||
4ef3f3be | 67 | static int follow_fork (void); |
96baa820 JM |
68 | |
69 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 70 | struct cmd_list_element *c); |
96baa820 | 71 | |
96baa820 JM |
72 | struct execution_control_state; |
73 | ||
74 | static int currently_stepping (struct execution_control_state *ecs); | |
75 | ||
76 | static void xdb_handle_command (char *args, int from_tty); | |
77 | ||
ea67f13b DJ |
78 | static int prepare_to_proceed (void); |
79 | ||
96baa820 | 80 | void _initialize_infrun (void); |
43ff13b4 | 81 | |
c906108c SS |
82 | int inferior_ignoring_startup_exec_events = 0; |
83 | int inferior_ignoring_leading_exec_events = 0; | |
84 | ||
5fbbeb29 CF |
85 | /* When set, stop the 'step' command if we enter a function which has |
86 | no line number information. The normal behavior is that we step | |
87 | over such function. */ | |
88 | int step_stop_if_no_debug = 0; | |
89 | ||
43ff13b4 | 90 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 91 | |
43ff13b4 JM |
92 | int sync_execution = 0; |
93 | ||
c906108c SS |
94 | /* wait_for_inferior and normal_stop use this to notify the user |
95 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
96 | running in. */ |
97 | ||
39f77062 | 98 | static ptid_t previous_inferior_ptid; |
7a292a7a SS |
99 | |
100 | /* This is true for configurations that may follow through execl() and | |
101 | similar functions. At present this is only true for HP-UX native. */ | |
102 | ||
103 | #ifndef MAY_FOLLOW_EXEC | |
104 | #define MAY_FOLLOW_EXEC (0) | |
c906108c SS |
105 | #endif |
106 | ||
7a292a7a SS |
107 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
108 | ||
d4f3574e SS |
109 | /* If the program uses ELF-style shared libraries, then calls to |
110 | functions in shared libraries go through stubs, which live in a | |
111 | table called the PLT (Procedure Linkage Table). The first time the | |
112 | function is called, the stub sends control to the dynamic linker, | |
113 | which looks up the function's real address, patches the stub so | |
114 | that future calls will go directly to the function, and then passes | |
115 | control to the function. | |
116 | ||
117 | If we are stepping at the source level, we don't want to see any of | |
118 | this --- we just want to skip over the stub and the dynamic linker. | |
119 | The simple approach is to single-step until control leaves the | |
120 | dynamic linker. | |
121 | ||
ca557f44 AC |
122 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
123 | dynamic linker calls functions in the shared C library, so you | |
124 | can't tell from the PC alone whether the dynamic linker is still | |
125 | running. In this case, we use a step-resume breakpoint to get us | |
126 | past the dynamic linker, as if we were using "next" to step over a | |
127 | function call. | |
d4f3574e SS |
128 | |
129 | IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic | |
130 | linker code or not. Normally, this means we single-step. However, | |
131 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
132 | address where we can place a step-resume breakpoint to get past the | |
133 | linker's symbol resolution function. | |
134 | ||
135 | IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a | |
136 | pretty portable way, by comparing the PC against the address ranges | |
137 | of the dynamic linker's sections. | |
138 | ||
139 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
140 | it depends on internal details of the dynamic linker. It's usually | |
141 | not too hard to figure out where to put a breakpoint, but it | |
142 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
143 | sanity checking. If it can't figure things out, returning zero and | |
144 | getting the (possibly confusing) stepping behavior is better than | |
145 | signalling an error, which will obscure the change in the | |
146 | inferior's state. */ | |
c906108c SS |
147 | |
148 | #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
149 | #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 | |
150 | #endif | |
151 | ||
c906108c SS |
152 | /* This function returns TRUE if pc is the address of an instruction |
153 | that lies within the dynamic linker (such as the event hook, or the | |
154 | dld itself). | |
155 | ||
156 | This function must be used only when a dynamic linker event has | |
157 | been caught, and the inferior is being stepped out of the hook, or | |
158 | undefined results are guaranteed. */ | |
159 | ||
160 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
161 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
162 | #endif | |
163 | ||
164 | /* On MIPS16, a function that returns a floating point value may call | |
165 | a library helper function to copy the return value to a floating point | |
166 | register. The IGNORE_HELPER_CALL macro returns non-zero if we | |
167 | should ignore (i.e. step over) this function call. */ | |
168 | #ifndef IGNORE_HELPER_CALL | |
169 | #define IGNORE_HELPER_CALL(pc) 0 | |
170 | #endif | |
171 | ||
172 | /* On some systems, the PC may be left pointing at an instruction that won't | |
173 | actually be executed. This is usually indicated by a bit in the PSW. If | |
174 | we find ourselves in such a state, then we step the target beyond the | |
175 | nullified instruction before returning control to the user so as to avoid | |
176 | confusion. */ | |
177 | ||
178 | #ifndef INSTRUCTION_NULLIFIED | |
179 | #define INSTRUCTION_NULLIFIED 0 | |
180 | #endif | |
181 | ||
c2c6d25f JM |
182 | /* We can't step off a permanent breakpoint in the ordinary way, because we |
183 | can't remove it. Instead, we have to advance the PC to the next | |
184 | instruction. This macro should expand to a pointer to a function that | |
185 | does that, or zero if we have no such function. If we don't have a | |
186 | definition for it, we have to report an error. */ | |
488f131b | 187 | #ifndef SKIP_PERMANENT_BREAKPOINT |
c2c6d25f JM |
188 | #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint) |
189 | static void | |
c2d11a7d | 190 | default_skip_permanent_breakpoint (void) |
c2c6d25f | 191 | { |
255e7dbf | 192 | error ("\ |
c2c6d25f JM |
193 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ |
194 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
255e7dbf | 195 | a command like `return' or `jump' to continue execution."); |
c2c6d25f JM |
196 | } |
197 | #endif | |
488f131b | 198 | |
c2c6d25f | 199 | |
7a292a7a SS |
200 | /* Convert the #defines into values. This is temporary until wfi control |
201 | flow is completely sorted out. */ | |
202 | ||
203 | #ifndef HAVE_STEPPABLE_WATCHPOINT | |
204 | #define HAVE_STEPPABLE_WATCHPOINT 0 | |
205 | #else | |
206 | #undef HAVE_STEPPABLE_WATCHPOINT | |
207 | #define HAVE_STEPPABLE_WATCHPOINT 1 | |
208 | #endif | |
209 | ||
692590c1 MS |
210 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
211 | #define CANNOT_STEP_HW_WATCHPOINTS 0 | |
212 | #else | |
213 | #undef CANNOT_STEP_HW_WATCHPOINTS | |
214 | #define CANNOT_STEP_HW_WATCHPOINTS 1 | |
215 | #endif | |
216 | ||
c906108c SS |
217 | /* Tables of how to react to signals; the user sets them. */ |
218 | ||
219 | static unsigned char *signal_stop; | |
220 | static unsigned char *signal_print; | |
221 | static unsigned char *signal_program; | |
222 | ||
223 | #define SET_SIGS(nsigs,sigs,flags) \ | |
224 | do { \ | |
225 | int signum = (nsigs); \ | |
226 | while (signum-- > 0) \ | |
227 | if ((sigs)[signum]) \ | |
228 | (flags)[signum] = 1; \ | |
229 | } while (0) | |
230 | ||
231 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
232 | do { \ | |
233 | int signum = (nsigs); \ | |
234 | while (signum-- > 0) \ | |
235 | if ((sigs)[signum]) \ | |
236 | (flags)[signum] = 0; \ | |
237 | } while (0) | |
238 | ||
39f77062 KB |
239 | /* Value to pass to target_resume() to cause all threads to resume */ |
240 | ||
241 | #define RESUME_ALL (pid_to_ptid (-1)) | |
c906108c SS |
242 | |
243 | /* Command list pointer for the "stop" placeholder. */ | |
244 | ||
245 | static struct cmd_list_element *stop_command; | |
246 | ||
247 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
248 | ||
249 | static int breakpoints_inserted; | |
250 | ||
251 | /* Function inferior was in as of last step command. */ | |
252 | ||
253 | static struct symbol *step_start_function; | |
254 | ||
255 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
256 | ||
257 | static int trap_expected; | |
258 | ||
259 | #ifdef SOLIB_ADD | |
260 | /* Nonzero if we want to give control to the user when we're notified | |
261 | of shared library events by the dynamic linker. */ | |
262 | static int stop_on_solib_events; | |
263 | #endif | |
264 | ||
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; | |
488f131b JB |
953 | int stepping_through_solib_after_catch; |
954 | bpstat stepping_through_solib_catchpoints; | |
955 | int enable_hw_watchpoints_after_wait; | |
956 | int stepping_through_sigtramp; | |
957 | int new_thread_event; | |
958 | struct target_waitstatus tmpstatus; | |
959 | enum infwait_states infwait_state; | |
960 | ptid_t waiton_ptid; | |
961 | int wait_some_more; | |
962 | }; | |
963 | ||
964 | void init_execution_control_state (struct execution_control_state *ecs); | |
965 | ||
1af510a8 | 966 | static void handle_step_into_function (struct execution_control_state *ecs); |
488f131b | 967 | void handle_inferior_event (struct execution_control_state *ecs); |
cd0fc7c3 | 968 | |
c2c6d25f | 969 | static void step_into_function (struct execution_control_state *ecs); |
d303a6c7 AC |
970 | static void insert_step_resume_breakpoint (struct frame_info *step_frame, |
971 | struct execution_control_state *ecs); | |
104c1213 JM |
972 | static void stop_stepping (struct execution_control_state *ecs); |
973 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 974 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
975 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
976 | int stop_info); | |
104c1213 | 977 | |
cd0fc7c3 SS |
978 | /* Wait for control to return from inferior to debugger. |
979 | If inferior gets a signal, we may decide to start it up again | |
980 | instead of returning. That is why there is a loop in this function. | |
981 | When this function actually returns it means the inferior | |
982 | should be left stopped and GDB should read more commands. */ | |
983 | ||
984 | void | |
96baa820 | 985 | wait_for_inferior (void) |
cd0fc7c3 SS |
986 | { |
987 | struct cleanup *old_cleanups; | |
988 | struct execution_control_state ecss; | |
989 | struct execution_control_state *ecs; | |
c906108c | 990 | |
8601f500 | 991 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c | 992 | &step_resume_breakpoint); |
cd0fc7c3 SS |
993 | |
994 | /* wfi still stays in a loop, so it's OK just to take the address of | |
995 | a local to get the ecs pointer. */ | |
996 | ecs = &ecss; | |
997 | ||
998 | /* Fill in with reasonable starting values. */ | |
999 | init_execution_control_state (ecs); | |
1000 | ||
c906108c | 1001 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1002 | previous_inferior_ptid = inferior_ptid; |
c906108c | 1003 | |
cd0fc7c3 SS |
1004 | overlay_cache_invalid = 1; |
1005 | ||
1006 | /* We have to invalidate the registers BEFORE calling target_wait | |
1007 | because they can be loaded from the target while in target_wait. | |
1008 | This makes remote debugging a bit more efficient for those | |
1009 | targets that provide critical registers as part of their normal | |
1010 | status mechanism. */ | |
1011 | ||
1012 | registers_changed (); | |
b83266a0 | 1013 | |
c906108c SS |
1014 | while (1) |
1015 | { | |
9a4105ab AC |
1016 | if (deprecated_target_wait_hook) |
1017 | ecs->ptid = deprecated_target_wait_hook (ecs->waiton_ptid, ecs->wp); | |
cd0fc7c3 | 1018 | else |
39f77062 | 1019 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
c906108c | 1020 | |
cd0fc7c3 SS |
1021 | /* Now figure out what to do with the result of the result. */ |
1022 | handle_inferior_event (ecs); | |
c906108c | 1023 | |
cd0fc7c3 SS |
1024 | if (!ecs->wait_some_more) |
1025 | break; | |
1026 | } | |
1027 | do_cleanups (old_cleanups); | |
1028 | } | |
c906108c | 1029 | |
43ff13b4 JM |
1030 | /* Asynchronous version of wait_for_inferior. It is called by the |
1031 | event loop whenever a change of state is detected on the file | |
1032 | descriptor corresponding to the target. It can be called more than | |
1033 | once to complete a single execution command. In such cases we need | |
1034 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1035 | last time that this function is called for a single execution | |
1036 | command, then report to the user that the inferior has stopped, and | |
1037 | do the necessary cleanups. */ | |
1038 | ||
1039 | struct execution_control_state async_ecss; | |
1040 | struct execution_control_state *async_ecs; | |
1041 | ||
1042 | void | |
fba45db2 | 1043 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1044 | { |
1045 | static struct cleanup *old_cleanups; | |
1046 | ||
c5aa993b | 1047 | async_ecs = &async_ecss; |
43ff13b4 JM |
1048 | |
1049 | if (!async_ecs->wait_some_more) | |
1050 | { | |
488f131b | 1051 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
c5aa993b | 1052 | &step_resume_breakpoint); |
43ff13b4 JM |
1053 | |
1054 | /* Fill in with reasonable starting values. */ | |
1055 | init_execution_control_state (async_ecs); | |
1056 | ||
43ff13b4 | 1057 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1058 | previous_inferior_ptid = inferior_ptid; |
43ff13b4 JM |
1059 | |
1060 | overlay_cache_invalid = 1; | |
1061 | ||
1062 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1063 | because they can be loaded from the target while in target_wait. |
1064 | This makes remote debugging a bit more efficient for those | |
1065 | targets that provide critical registers as part of their normal | |
1066 | status mechanism. */ | |
43ff13b4 JM |
1067 | |
1068 | registers_changed (); | |
1069 | } | |
1070 | ||
9a4105ab | 1071 | if (deprecated_target_wait_hook) |
488f131b | 1072 | async_ecs->ptid = |
9a4105ab | 1073 | deprecated_target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 | 1074 | else |
39f77062 | 1075 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 JM |
1076 | |
1077 | /* Now figure out what to do with the result of the result. */ | |
1078 | handle_inferior_event (async_ecs); | |
1079 | ||
1080 | if (!async_ecs->wait_some_more) | |
1081 | { | |
adf40b2e | 1082 | /* Do only the cleanups that have been added by this |
488f131b JB |
1083 | function. Let the continuations for the commands do the rest, |
1084 | if there are any. */ | |
43ff13b4 JM |
1085 | do_exec_cleanups (old_cleanups); |
1086 | normal_stop (); | |
c2d11a7d JM |
1087 | if (step_multi && stop_step) |
1088 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1089 | else | |
1090 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1091 | } |
1092 | } | |
1093 | ||
cd0fc7c3 SS |
1094 | /* Prepare an execution control state for looping through a |
1095 | wait_for_inferior-type loop. */ | |
1096 | ||
1097 | void | |
96baa820 | 1098 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1099 | { |
c2d11a7d | 1100 | /* ecs->another_trap? */ |
cd0fc7c3 SS |
1101 | ecs->random_signal = 0; |
1102 | ecs->remove_breakpoints_on_following_step = 0; | |
1103 | ecs->handling_longjmp = 0; /* FIXME */ | |
cd0fc7c3 SS |
1104 | ecs->stepping_through_solib_after_catch = 0; |
1105 | ecs->stepping_through_solib_catchpoints = NULL; | |
1106 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1107 | ecs->stepping_through_sigtramp = 0; | |
1108 | ecs->sal = find_pc_line (prev_pc, 0); | |
1109 | ecs->current_line = ecs->sal.line; | |
1110 | ecs->current_symtab = ecs->sal.symtab; | |
1111 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1112 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1113 | ecs->wp = &(ecs->ws); |
1114 | } | |
1115 | ||
a0b3c4fd | 1116 | /* Call this function before setting step_resume_breakpoint, as a |
53a5351d JM |
1117 | sanity check. There should never be more than one step-resume |
1118 | breakpoint per thread, so we should never be setting a new | |
1119 | step_resume_breakpoint when one is already active. */ | |
a0b3c4fd | 1120 | static void |
96baa820 | 1121 | check_for_old_step_resume_breakpoint (void) |
a0b3c4fd JM |
1122 | { |
1123 | if (step_resume_breakpoint) | |
488f131b JB |
1124 | warning |
1125 | ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint"); | |
a0b3c4fd JM |
1126 | } |
1127 | ||
e02bc4cc | 1128 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
1129 | target_wait()/deprecated_target_wait_hook(). The data is actually |
1130 | cached by handle_inferior_event(), which gets called immediately | |
1131 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
1132 | |
1133 | void | |
488f131b | 1134 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1135 | { |
39f77062 | 1136 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1137 | *status = target_last_waitstatus; |
1138 | } | |
1139 | ||
dd80620e MS |
1140 | /* Switch thread contexts, maintaining "infrun state". */ |
1141 | ||
1142 | static void | |
1143 | context_switch (struct execution_control_state *ecs) | |
1144 | { | |
1145 | /* Caution: it may happen that the new thread (or the old one!) | |
1146 | is not in the thread list. In this case we must not attempt | |
1147 | to "switch context", or we run the risk that our context may | |
1148 | be lost. This may happen as a result of the target module | |
1149 | mishandling thread creation. */ | |
1150 | ||
1151 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) | |
488f131b | 1152 | { /* Perform infrun state context switch: */ |
dd80620e | 1153 | /* Save infrun state for the old thread. */ |
0ce3d317 | 1154 | save_infrun_state (inferior_ptid, prev_pc, |
dd80620e | 1155 | trap_expected, step_resume_breakpoint, |
15960608 | 1156 | step_range_start, |
aa0cd9c1 | 1157 | step_range_end, &step_frame_id, |
dd80620e MS |
1158 | ecs->handling_longjmp, ecs->another_trap, |
1159 | ecs->stepping_through_solib_after_catch, | |
1160 | ecs->stepping_through_solib_catchpoints, | |
1161 | ecs->stepping_through_sigtramp, | |
f2c9ca08 | 1162 | ecs->current_line, ecs->current_symtab); |
dd80620e MS |
1163 | |
1164 | /* Load infrun state for the new thread. */ | |
0ce3d317 | 1165 | load_infrun_state (ecs->ptid, &prev_pc, |
dd80620e | 1166 | &trap_expected, &step_resume_breakpoint, |
15960608 | 1167 | &step_range_start, |
aa0cd9c1 | 1168 | &step_range_end, &step_frame_id, |
dd80620e MS |
1169 | &ecs->handling_longjmp, &ecs->another_trap, |
1170 | &ecs->stepping_through_solib_after_catch, | |
1171 | &ecs->stepping_through_solib_catchpoints, | |
488f131b | 1172 | &ecs->stepping_through_sigtramp, |
f2c9ca08 | 1173 | &ecs->current_line, &ecs->current_symtab); |
dd80620e MS |
1174 | } |
1175 | inferior_ptid = ecs->ptid; | |
1176 | } | |
1177 | ||
1af510a8 JB |
1178 | /* Handle the inferior event in the cases when we just stepped |
1179 | into a function. */ | |
1180 | ||
1181 | static void | |
1182 | handle_step_into_function (struct execution_control_state *ecs) | |
1183 | { | |
1184 | CORE_ADDR real_stop_pc; | |
1185 | ||
1186 | if ((step_over_calls == STEP_OVER_NONE) | |
1187 | || ((step_range_end == 1) | |
1188 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
1189 | { | |
1190 | /* I presume that step_over_calls is only 0 when we're | |
1191 | supposed to be stepping at the assembly language level | |
1192 | ("stepi"). Just stop. */ | |
1193 | /* Also, maybe we just did a "nexti" inside a prolog, | |
1194 | so we thought it was a subroutine call but it was not. | |
1195 | Stop as well. FENN */ | |
1196 | stop_step = 1; | |
1197 | print_stop_reason (END_STEPPING_RANGE, 0); | |
1198 | stop_stepping (ecs); | |
1199 | return; | |
1200 | } | |
1201 | ||
1202 | if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc)) | |
1203 | { | |
922d5ae0 AC |
1204 | /* We're doing a "next", set a breakpoint at callee's return |
1205 | address (the address at which the caller will resume). */ | |
1206 | insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()), | |
1207 | ecs); | |
1af510a8 JB |
1208 | keep_going (ecs); |
1209 | return; | |
1210 | } | |
1211 | ||
1212 | /* If we are in a function call trampoline (a stub between | |
1213 | the calling routine and the real function), locate the real | |
1214 | function. That's what tells us (a) whether we want to step | |
1215 | into it at all, and (b) what prologue we want to run to | |
1216 | the end of, if we do step into it. */ | |
1217 | real_stop_pc = skip_language_trampoline (stop_pc); | |
1218 | if (real_stop_pc == 0) | |
1219 | real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); | |
1220 | if (real_stop_pc != 0) | |
1221 | ecs->stop_func_start = real_stop_pc; | |
1222 | ||
1223 | /* If we have line number information for the function we | |
1224 | are thinking of stepping into, step into it. | |
1225 | ||
1226 | If there are several symtabs at that PC (e.g. with include | |
1227 | files), just want to know whether *any* of them have line | |
1228 | numbers. find_pc_line handles this. */ | |
1229 | { | |
1230 | struct symtab_and_line tmp_sal; | |
1231 | ||
1232 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); | |
1233 | if (tmp_sal.line != 0) | |
1234 | { | |
1235 | step_into_function (ecs); | |
1236 | return; | |
1237 | } | |
1238 | } | |
1239 | ||
1240 | /* If we have no line number and the step-stop-if-no-debug | |
1241 | is set, we stop the step so that the user has a chance to | |
1242 | switch in assembly mode. */ | |
1243 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) | |
1244 | { | |
1245 | stop_step = 1; | |
1246 | print_stop_reason (END_STEPPING_RANGE, 0); | |
1247 | stop_stepping (ecs); | |
1248 | return; | |
1249 | } | |
1250 | ||
922d5ae0 AC |
1251 | /* Set a breakpoint at callee's return address (the address at which |
1252 | the caller will resume). */ | |
1253 | insert_step_resume_breakpoint (get_prev_frame (get_current_frame ()), ecs); | |
1af510a8 JB |
1254 | keep_going (ecs); |
1255 | return; | |
1256 | } | |
dd80620e | 1257 | |
4fa8626c DJ |
1258 | static void |
1259 | adjust_pc_after_break (struct execution_control_state *ecs) | |
1260 | { | |
8aad930b | 1261 | CORE_ADDR breakpoint_pc; |
4fa8626c DJ |
1262 | |
1263 | /* If this target does not decrement the PC after breakpoints, then | |
1264 | we have nothing to do. */ | |
1265 | if (DECR_PC_AFTER_BREAK == 0) | |
1266 | return; | |
1267 | ||
1268 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If | |
1269 | we aren't, just return. | |
9709f61c DJ |
1270 | |
1271 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
1272 | affected by DECR_PC_AFTER_BREAK. Other waitkinds which are implemented | |
1273 | by software breakpoints should be handled through the normal breakpoint | |
1274 | layer. | |
4fa8626c DJ |
1275 | |
1276 | NOTE drow/2004-01-31: On some targets, breakpoints may generate | |
1277 | different signals (SIGILL or SIGEMT for instance), but it is less | |
1278 | clear where the PC is pointing afterwards. It may not match | |
1279 | DECR_PC_AFTER_BREAK. I don't know any specific target that generates | |
1280 | these signals at breakpoints (the code has been in GDB since at least | |
1281 | 1992) so I can not guess how to handle them here. | |
1282 | ||
1283 | In earlier versions of GDB, a target with HAVE_NONSTEPPABLE_WATCHPOINTS | |
1284 | would have the PC after hitting a watchpoint affected by | |
1285 | DECR_PC_AFTER_BREAK. I haven't found any target with both of these set | |
1286 | in GDB history, and it seems unlikely to be correct, so | |
1287 | HAVE_NONSTEPPABLE_WATCHPOINTS is not checked here. */ | |
1288 | ||
1289 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
1290 | return; | |
1291 | ||
1292 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
1293 | return; | |
1294 | ||
8aad930b AC |
1295 | /* Find the location where (if we've hit a breakpoint) the |
1296 | breakpoint would be. */ | |
1297 | breakpoint_pc = read_pc_pid (ecs->ptid) - DECR_PC_AFTER_BREAK; | |
1298 | ||
1299 | if (SOFTWARE_SINGLE_STEP_P ()) | |
1300 | { | |
1301 | /* When using software single-step, a SIGTRAP can only indicate | |
1302 | an inserted breakpoint. This actually makes things | |
1303 | easier. */ | |
1304 | if (singlestep_breakpoints_inserted_p) | |
1305 | /* When software single stepping, the instruction at [prev_pc] | |
1306 | is never a breakpoint, but the instruction following | |
1307 | [prev_pc] (in program execution order) always is. Assume | |
1308 | that following instruction was reached and hence a software | |
1309 | breakpoint was hit. */ | |
1310 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1311 | else if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1312 | /* The inferior was free running (i.e., no single-step | |
1313 | breakpoints inserted) and it hit a software breakpoint. */ | |
1314 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1315 | } | |
1316 | else | |
1317 | { | |
1318 | /* When using hardware single-step, a SIGTRAP is reported for | |
1319 | both a completed single-step and a software breakpoint. Need | |
1320 | to differentiate between the two as the latter needs | |
1321 | adjusting but the former does not. */ | |
1322 | if (currently_stepping (ecs)) | |
1323 | { | |
1324 | if (prev_pc == breakpoint_pc | |
1325 | && software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1326 | /* Hardware single-stepped a software breakpoint (as | |
1327 | occures when the inferior is resumed with PC pointing | |
1328 | at not-yet-hit software breakpoint). Since the | |
1329 | breakpoint really is executed, the inferior needs to be | |
1330 | backed up to the breakpoint address. */ | |
1331 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1332 | } | |
1333 | else | |
1334 | { | |
1335 | if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
1336 | /* The inferior was free running (i.e., no hardware | |
1337 | single-step and no possibility of a false SIGTRAP) and | |
1338 | hit a software breakpoint. */ | |
1339 | write_pc_pid (breakpoint_pc, ecs->ptid); | |
1340 | } | |
1341 | } | |
4fa8626c DJ |
1342 | } |
1343 | ||
cd0fc7c3 SS |
1344 | /* Given an execution control state that has been freshly filled in |
1345 | by an event from the inferior, figure out what it means and take | |
1346 | appropriate action. */ | |
c906108c | 1347 | |
7270d8f2 OF |
1348 | int stepped_after_stopped_by_watchpoint; |
1349 | ||
cd0fc7c3 | 1350 | void |
96baa820 | 1351 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 1352 | { |
65e82032 AC |
1353 | /* NOTE: cagney/2003-03-28: If you're looking at this code and |
1354 | thinking that the variable stepped_after_stopped_by_watchpoint | |
1355 | isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT, | |
1356 | defined in the file "config/pa/nm-hppah.h", accesses the variable | |
1357 | indirectly. Mutter something rude about the HP merge. */ | |
c8edd8b4 | 1358 | int sw_single_step_trap_p = 0; |
00d4360e | 1359 | int stopped_by_watchpoint = 0; |
cd0fc7c3 | 1360 | |
e02bc4cc | 1361 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1362 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1363 | target_last_waitstatus = *ecs->wp; |
1364 | ||
4fa8626c DJ |
1365 | adjust_pc_after_break (ecs); |
1366 | ||
488f131b JB |
1367 | switch (ecs->infwait_state) |
1368 | { | |
1369 | case infwait_thread_hop_state: | |
1370 | /* Cancel the waiton_ptid. */ | |
1371 | ecs->waiton_ptid = pid_to_ptid (-1); | |
65e82032 AC |
1372 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event |
1373 | is serviced in this loop, below. */ | |
1374 | if (ecs->enable_hw_watchpoints_after_wait) | |
1375 | { | |
1376 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1377 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1378 | } | |
1379 | stepped_after_stopped_by_watchpoint = 0; | |
1380 | break; | |
b83266a0 | 1381 | |
488f131b JB |
1382 | case infwait_normal_state: |
1383 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event | |
1384 | is serviced in this loop, below. */ | |
1385 | if (ecs->enable_hw_watchpoints_after_wait) | |
1386 | { | |
1387 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1388 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1389 | } | |
1390 | stepped_after_stopped_by_watchpoint = 0; | |
1391 | break; | |
b83266a0 | 1392 | |
488f131b | 1393 | case infwait_nullified_state: |
65e82032 | 1394 | stepped_after_stopped_by_watchpoint = 0; |
488f131b | 1395 | break; |
b83266a0 | 1396 | |
488f131b JB |
1397 | case infwait_nonstep_watch_state: |
1398 | insert_breakpoints (); | |
c906108c | 1399 | |
488f131b JB |
1400 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1401 | handle things like signals arriving and other things happening | |
1402 | in combination correctly? */ | |
1403 | stepped_after_stopped_by_watchpoint = 1; | |
1404 | break; | |
65e82032 AC |
1405 | |
1406 | default: | |
1407 | internal_error (__FILE__, __LINE__, "bad switch"); | |
488f131b JB |
1408 | } |
1409 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1410 | |
488f131b | 1411 | flush_cached_frames (); |
c906108c | 1412 | |
488f131b | 1413 | /* If it's a new process, add it to the thread database */ |
c906108c | 1414 | |
488f131b JB |
1415 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
1416 | && !in_thread_list (ecs->ptid)); | |
1417 | ||
1418 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1419 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1420 | { | |
1421 | add_thread (ecs->ptid); | |
c906108c | 1422 | |
488f131b JB |
1423 | ui_out_text (uiout, "[New "); |
1424 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); | |
1425 | ui_out_text (uiout, "]\n"); | |
c906108c SS |
1426 | |
1427 | #if 0 | |
488f131b JB |
1428 | /* NOTE: This block is ONLY meant to be invoked in case of a |
1429 | "thread creation event"! If it is invoked for any other | |
1430 | sort of event (such as a new thread landing on a breakpoint), | |
1431 | the event will be discarded, which is almost certainly | |
1432 | a bad thing! | |
1433 | ||
1434 | To avoid this, the low-level module (eg. target_wait) | |
1435 | should call in_thread_list and add_thread, so that the | |
1436 | new thread is known by the time we get here. */ | |
1437 | ||
1438 | /* We may want to consider not doing a resume here in order | |
1439 | to give the user a chance to play with the new thread. | |
1440 | It might be good to make that a user-settable option. */ | |
1441 | ||
1442 | /* At this point, all threads are stopped (happens | |
1443 | automatically in either the OS or the native code). | |
1444 | Therefore we need to continue all threads in order to | |
1445 | make progress. */ | |
1446 | ||
1447 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1448 | prepare_to_wait (ecs); | |
1449 | return; | |
c906108c | 1450 | #endif |
488f131b | 1451 | } |
c906108c | 1452 | |
488f131b JB |
1453 | switch (ecs->ws.kind) |
1454 | { | |
1455 | case TARGET_WAITKIND_LOADED: | |
1456 | /* Ignore gracefully during startup of the inferior, as it | |
1457 | might be the shell which has just loaded some objects, | |
1458 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1459 | #ifdef SOLIB_ADD |
c0236d92 | 1460 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b JB |
1461 | { |
1462 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1463 | breakpoint addresses via breakpoint_re_set. */ | |
1464 | if (breakpoints_inserted) | |
1465 | remove_breakpoints (); | |
c906108c | 1466 | |
488f131b JB |
1467 | /* Check for any newly added shared libraries if we're |
1468 | supposed to be adding them automatically. Switch | |
1469 | terminal for any messages produced by | |
1470 | breakpoint_re_set. */ | |
1471 | target_terminal_ours_for_output (); | |
aff6338a AC |
1472 | /* NOTE: cagney/2003-11-25: Make certain that the target |
1473 | stack's section table is kept up-to-date. Architectures, | |
1474 | (e.g., PPC64), use the section table to perform | |
1475 | operations such as address => section name and hence | |
1476 | require the table to contain all sections (including | |
1477 | those found in shared libraries). */ | |
1478 | /* NOTE: cagney/2003-11-25: Pass current_target and not | |
1479 | exec_ops to SOLIB_ADD. This is because current GDB is | |
1480 | only tooled to propagate section_table changes out from | |
1481 | the "current_target" (see target_resize_to_sections), and | |
1482 | not up from the exec stratum. This, of course, isn't | |
1483 | right. "infrun.c" should only interact with the | |
1484 | exec/process stratum, instead relying on the target stack | |
1485 | to propagate relevant changes (stop, section table | |
1486 | changed, ...) up to other layers. */ | |
1487 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); | |
488f131b JB |
1488 | target_terminal_inferior (); |
1489 | ||
1490 | /* Reinsert breakpoints and continue. */ | |
1491 | if (breakpoints_inserted) | |
1492 | insert_breakpoints (); | |
1493 | } | |
c906108c | 1494 | #endif |
488f131b JB |
1495 | resume (0, TARGET_SIGNAL_0); |
1496 | prepare_to_wait (ecs); | |
1497 | return; | |
c5aa993b | 1498 | |
488f131b JB |
1499 | case TARGET_WAITKIND_SPURIOUS: |
1500 | resume (0, TARGET_SIGNAL_0); | |
1501 | prepare_to_wait (ecs); | |
1502 | return; | |
c5aa993b | 1503 | |
488f131b JB |
1504 | case TARGET_WAITKIND_EXITED: |
1505 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
1506 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
1507 | ||
1508 | /* Record the exit code in the convenience variable $_exitcode, so | |
1509 | that the user can inspect this again later. */ | |
1510 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1511 | value_from_longest (builtin_type_int, | |
1512 | (LONGEST) ecs->ws.value.integer)); | |
1513 | gdb_flush (gdb_stdout); | |
1514 | target_mourn_inferior (); | |
1515 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1516 | stop_print_frame = 0; | |
1517 | stop_stepping (ecs); | |
1518 | return; | |
c5aa993b | 1519 | |
488f131b JB |
1520 | case TARGET_WAITKIND_SIGNALLED: |
1521 | stop_print_frame = 0; | |
1522 | stop_signal = ecs->ws.value.sig; | |
1523 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1524 | |
488f131b JB |
1525 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1526 | reach here unless the inferior is dead. However, for years | |
1527 | target_kill() was called here, which hints that fatal signals aren't | |
1528 | really fatal on some systems. If that's true, then some changes | |
1529 | may be needed. */ | |
1530 | target_mourn_inferior (); | |
c906108c | 1531 | |
488f131b JB |
1532 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
1533 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1534 | stop_stepping (ecs); | |
1535 | return; | |
c906108c | 1536 | |
488f131b JB |
1537 | /* The following are the only cases in which we keep going; |
1538 | the above cases end in a continue or goto. */ | |
1539 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 1540 | case TARGET_WAITKIND_VFORKED: |
488f131b JB |
1541 | stop_signal = TARGET_SIGNAL_TRAP; |
1542 | pending_follow.kind = ecs->ws.kind; | |
1543 | ||
8e7d2c16 DJ |
1544 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
1545 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c | 1546 | |
488f131b | 1547 | stop_pc = read_pc (); |
675bf4cb | 1548 | |
00d4360e | 1549 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1550 | |
488f131b | 1551 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
04e68871 DJ |
1552 | |
1553 | /* If no catchpoint triggered for this, then keep going. */ | |
1554 | if (ecs->random_signal) | |
1555 | { | |
1556 | stop_signal = TARGET_SIGNAL_0; | |
1557 | keep_going (ecs); | |
1558 | return; | |
1559 | } | |
488f131b JB |
1560 | goto process_event_stop_test; |
1561 | ||
1562 | case TARGET_WAITKIND_EXECD: | |
1563 | stop_signal = TARGET_SIGNAL_TRAP; | |
1564 | ||
7d2830a3 DJ |
1565 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
1566 | target_wait function. Until then following vfork on HP/UX 10.20 | |
1567 | is probably broken by this. Of course, it's broken anyway. */ | |
488f131b JB |
1568 | /* Is this a target which reports multiple exec events per actual |
1569 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1570 | ignore all but the last one. Just resume the exec'r, and wait | |
1571 | for the next exec event. */ | |
1572 | if (inferior_ignoring_leading_exec_events) | |
1573 | { | |
1574 | inferior_ignoring_leading_exec_events--; | |
1575 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1576 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event. | |
1577 | parent_pid); | |
1578 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); | |
1579 | prepare_to_wait (ecs); | |
1580 | return; | |
1581 | } | |
1582 | inferior_ignoring_leading_exec_events = | |
1583 | target_reported_exec_events_per_exec_call () - 1; | |
1584 | ||
1585 | pending_follow.execd_pathname = | |
1586 | savestring (ecs->ws.value.execd_pathname, | |
1587 | strlen (ecs->ws.value.execd_pathname)); | |
1588 | ||
488f131b JB |
1589 | /* This causes the eventpoints and symbol table to be reset. Must |
1590 | do this now, before trying to determine whether to stop. */ | |
1591 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); | |
1592 | xfree (pending_follow.execd_pathname); | |
c906108c | 1593 | |
488f131b JB |
1594 | stop_pc = read_pc_pid (ecs->ptid); |
1595 | ecs->saved_inferior_ptid = inferior_ptid; | |
1596 | inferior_ptid = ecs->ptid; | |
675bf4cb | 1597 | |
00d4360e | 1598 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0); |
675bf4cb | 1599 | |
488f131b JB |
1600 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1601 | inferior_ptid = ecs->saved_inferior_ptid; | |
04e68871 DJ |
1602 | |
1603 | /* If no catchpoint triggered for this, then keep going. */ | |
1604 | if (ecs->random_signal) | |
1605 | { | |
1606 | stop_signal = TARGET_SIGNAL_0; | |
1607 | keep_going (ecs); | |
1608 | return; | |
1609 | } | |
488f131b JB |
1610 | goto process_event_stop_test; |
1611 | ||
1612 | /* These syscall events are returned on HP-UX, as part of its | |
1613 | implementation of page-protection-based "hardware" watchpoints. | |
1614 | HP-UX has unfortunate interactions between page-protections and | |
1615 | some system calls. Our solution is to disable hardware watches | |
1616 | when a system call is entered, and reenable them when the syscall | |
1617 | completes. The downside of this is that we may miss the precise | |
1618 | point at which a watched piece of memory is modified. "Oh well." | |
1619 | ||
1620 | Note that we may have multiple threads running, which may each | |
1621 | enter syscalls at roughly the same time. Since we don't have a | |
1622 | good notion currently of whether a watched piece of memory is | |
1623 | thread-private, we'd best not have any page-protections active | |
1624 | when any thread is in a syscall. Thus, we only want to reenable | |
1625 | hardware watches when no threads are in a syscall. | |
1626 | ||
1627 | Also, be careful not to try to gather much state about a thread | |
1628 | that's in a syscall. It's frequently a losing proposition. */ | |
1629 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
1630 | number_of_threads_in_syscalls++; | |
1631 | if (number_of_threads_in_syscalls == 1) | |
1632 | { | |
1633 | TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1634 | } | |
1635 | resume (0, TARGET_SIGNAL_0); | |
1636 | prepare_to_wait (ecs); | |
1637 | return; | |
c906108c | 1638 | |
488f131b JB |
1639 | /* Before examining the threads further, step this thread to |
1640 | get it entirely out of the syscall. (We get notice of the | |
1641 | event when the thread is just on the verge of exiting a | |
1642 | syscall. Stepping one instruction seems to get it back | |
1643 | into user code.) | |
c906108c | 1644 | |
488f131b JB |
1645 | Note that although the logical place to reenable h/w watches |
1646 | is here, we cannot. We cannot reenable them before stepping | |
1647 | the thread (this causes the next wait on the thread to hang). | |
c4093a6a | 1648 | |
488f131b JB |
1649 | Nor can we enable them after stepping until we've done a wait. |
1650 | Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait | |
1651 | here, which will be serviced immediately after the target | |
1652 | is waited on. */ | |
1653 | case TARGET_WAITKIND_SYSCALL_RETURN: | |
1654 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); | |
1655 | ||
1656 | if (number_of_threads_in_syscalls > 0) | |
1657 | { | |
1658 | number_of_threads_in_syscalls--; | |
1659 | ecs->enable_hw_watchpoints_after_wait = | |
1660 | (number_of_threads_in_syscalls == 0); | |
1661 | } | |
1662 | prepare_to_wait (ecs); | |
1663 | return; | |
c906108c | 1664 | |
488f131b JB |
1665 | case TARGET_WAITKIND_STOPPED: |
1666 | stop_signal = ecs->ws.value.sig; | |
1667 | break; | |
c906108c | 1668 | |
488f131b JB |
1669 | /* We had an event in the inferior, but we are not interested |
1670 | in handling it at this level. The lower layers have already | |
8e7d2c16 DJ |
1671 | done what needs to be done, if anything. |
1672 | ||
1673 | One of the possible circumstances for this is when the | |
1674 | inferior produces output for the console. The inferior has | |
1675 | not stopped, and we are ignoring the event. Another possible | |
1676 | circumstance is any event which the lower level knows will be | |
1677 | reported multiple times without an intervening resume. */ | |
488f131b | 1678 | case TARGET_WAITKIND_IGNORE: |
8e7d2c16 | 1679 | prepare_to_wait (ecs); |
488f131b JB |
1680 | return; |
1681 | } | |
c906108c | 1682 | |
488f131b JB |
1683 | /* We may want to consider not doing a resume here in order to give |
1684 | the user a chance to play with the new thread. It might be good | |
1685 | to make that a user-settable option. */ | |
c906108c | 1686 | |
488f131b JB |
1687 | /* At this point, all threads are stopped (happens automatically in |
1688 | either the OS or the native code). Therefore we need to continue | |
1689 | all threads in order to make progress. */ | |
1690 | if (ecs->new_thread_event) | |
1691 | { | |
1692 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1693 | prepare_to_wait (ecs); | |
1694 | return; | |
1695 | } | |
c906108c | 1696 | |
488f131b JB |
1697 | stop_pc = read_pc_pid (ecs->ptid); |
1698 | ||
9f976b41 DJ |
1699 | if (stepping_past_singlestep_breakpoint) |
1700 | { | |
1701 | gdb_assert (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p); | |
1702 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); | |
1703 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
1704 | ||
1705 | stepping_past_singlestep_breakpoint = 0; | |
1706 | ||
1707 | /* We've either finished single-stepping past the single-step | |
1708 | breakpoint, or stopped for some other reason. It would be nice if | |
1709 | we could tell, but we can't reliably. */ | |
1710 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1711 | { | |
1712 | /* Pull the single step breakpoints out of the target. */ | |
1713 | SOFTWARE_SINGLE_STEP (0, 0); | |
1714 | singlestep_breakpoints_inserted_p = 0; | |
1715 | ||
1716 | ecs->random_signal = 0; | |
1717 | ||
1718 | ecs->ptid = saved_singlestep_ptid; | |
1719 | context_switch (ecs); | |
9a4105ab AC |
1720 | if (deprecated_context_hook) |
1721 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
1722 | |
1723 | resume (1, TARGET_SIGNAL_0); | |
1724 | prepare_to_wait (ecs); | |
1725 | return; | |
1726 | } | |
1727 | } | |
1728 | ||
1729 | stepping_past_singlestep_breakpoint = 0; | |
1730 | ||
488f131b JB |
1731 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1732 | another thread. If so, then step that thread past the breakpoint, | |
1733 | and continue it. */ | |
1734 | ||
1735 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1736 | { | |
9f976b41 DJ |
1737 | int thread_hop_needed = 0; |
1738 | ||
f8d40ec8 JB |
1739 | /* Check if a regular breakpoint has been hit before checking |
1740 | for a potential single step breakpoint. Otherwise, GDB will | |
1741 | not see this breakpoint hit when stepping onto breakpoints. */ | |
4fa8626c | 1742 | if (breakpoints_inserted && breakpoint_here_p (stop_pc)) |
488f131b | 1743 | { |
c5aa993b | 1744 | ecs->random_signal = 0; |
4fa8626c | 1745 | if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
9f976b41 DJ |
1746 | thread_hop_needed = 1; |
1747 | } | |
1748 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) | |
1749 | { | |
1750 | ecs->random_signal = 0; | |
1751 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
1752 | change when we go from single-threaded to multi-threaded. If | |
1753 | the singlestep_ptid is still in the list, assume that it is | |
1754 | really different from ecs->ptid. */ | |
1755 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
1756 | && in_thread_list (singlestep_ptid)) | |
1757 | { | |
1758 | thread_hop_needed = 1; | |
1759 | stepping_past_singlestep_breakpoint = 1; | |
1760 | saved_singlestep_ptid = singlestep_ptid; | |
1761 | } | |
1762 | } | |
1763 | ||
1764 | if (thread_hop_needed) | |
488f131b JB |
1765 | { |
1766 | int remove_status; | |
1767 | ||
1768 | /* Saw a breakpoint, but it was hit by the wrong thread. | |
1769 | Just continue. */ | |
488f131b | 1770 | |
9f976b41 DJ |
1771 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1772 | { | |
1773 | /* Pull the single step breakpoints out of the target. */ | |
1774 | SOFTWARE_SINGLE_STEP (0, 0); | |
1775 | singlestep_breakpoints_inserted_p = 0; | |
1776 | } | |
1777 | ||
488f131b JB |
1778 | remove_status = remove_breakpoints (); |
1779 | /* Did we fail to remove breakpoints? If so, try | |
1780 | to set the PC past the bp. (There's at least | |
1781 | one situation in which we can fail to remove | |
1782 | the bp's: On HP-UX's that use ttrace, we can't | |
1783 | change the address space of a vforking child | |
1784 | process until the child exits (well, okay, not | |
1785 | then either :-) or execs. */ | |
1786 | if (remove_status != 0) | |
1787 | { | |
1788 | /* FIXME! This is obviously non-portable! */ | |
4fa8626c | 1789 | write_pc_pid (stop_pc + 4, ecs->ptid); |
488f131b JB |
1790 | /* We need to restart all the threads now, |
1791 | * unles we're running in scheduler-locked mode. | |
1792 | * Use currently_stepping to determine whether to | |
1793 | * step or continue. | |
1794 | */ | |
1795 | /* FIXME MVS: is there any reason not to call resume()? */ | |
1796 | if (scheduler_mode == schedlock_on) | |
1797 | target_resume (ecs->ptid, | |
1798 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1799 | else | |
1800 | target_resume (RESUME_ALL, | |
1801 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1802 | prepare_to_wait (ecs); | |
1803 | return; | |
1804 | } | |
1805 | else | |
1806 | { /* Single step */ | |
1807 | breakpoints_inserted = 0; | |
1808 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
1809 | context_switch (ecs); | |
1810 | ecs->waiton_ptid = ecs->ptid; | |
1811 | ecs->wp = &(ecs->ws); | |
1812 | ecs->another_trap = 1; | |
1813 | ||
1814 | ecs->infwait_state = infwait_thread_hop_state; | |
1815 | keep_going (ecs); | |
1816 | registers_changed (); | |
1817 | return; | |
1818 | } | |
488f131b | 1819 | } |
f8d40ec8 JB |
1820 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1821 | { | |
c8edd8b4 | 1822 | sw_single_step_trap_p = 1; |
f8d40ec8 JB |
1823 | ecs->random_signal = 0; |
1824 | } | |
488f131b JB |
1825 | } |
1826 | else | |
1827 | ecs->random_signal = 1; | |
c906108c | 1828 | |
488f131b | 1829 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
1830 | so, then switch to that thread. */ |
1831 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 1832 | { |
488f131b | 1833 | context_switch (ecs); |
c5aa993b | 1834 | |
9a4105ab AC |
1835 | if (deprecated_context_hook) |
1836 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
c5aa993b | 1837 | |
488f131b JB |
1838 | flush_cached_frames (); |
1839 | } | |
c906108c | 1840 | |
488f131b JB |
1841 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1842 | { | |
1843 | /* Pull the single step breakpoints out of the target. */ | |
1844 | SOFTWARE_SINGLE_STEP (0, 0); | |
1845 | singlestep_breakpoints_inserted_p = 0; | |
1846 | } | |
c906108c | 1847 | |
488f131b JB |
1848 | /* If PC is pointing at a nullified instruction, then step beyond |
1849 | it so that the user won't be confused when GDB appears to be ready | |
1850 | to execute it. */ | |
c906108c | 1851 | |
488f131b JB |
1852 | /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */ |
1853 | if (INSTRUCTION_NULLIFIED) | |
1854 | { | |
1855 | registers_changed (); | |
1856 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); | |
c906108c | 1857 | |
488f131b JB |
1858 | /* We may have received a signal that we want to pass to |
1859 | the inferior; therefore, we must not clobber the waitstatus | |
1860 | in WS. */ | |
c906108c | 1861 | |
488f131b JB |
1862 | ecs->infwait_state = infwait_nullified_state; |
1863 | ecs->waiton_ptid = ecs->ptid; | |
1864 | ecs->wp = &(ecs->tmpstatus); | |
1865 | prepare_to_wait (ecs); | |
1866 | return; | |
1867 | } | |
c906108c | 1868 | |
488f131b JB |
1869 | /* It may not be necessary to disable the watchpoint to stop over |
1870 | it. For example, the PA can (with some kernel cooperation) | |
1871 | single step over a watchpoint without disabling the watchpoint. */ | |
1872 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1873 | { | |
1874 | resume (1, 0); | |
1875 | prepare_to_wait (ecs); | |
1876 | return; | |
1877 | } | |
c906108c | 1878 | |
488f131b JB |
1879 | /* It is far more common to need to disable a watchpoint to step |
1880 | the inferior over it. FIXME. What else might a debug | |
1881 | register or page protection watchpoint scheme need here? */ | |
1882 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1883 | { | |
1884 | /* At this point, we are stopped at an instruction which has | |
1885 | attempted to write to a piece of memory under control of | |
1886 | a watchpoint. The instruction hasn't actually executed | |
1887 | yet. If we were to evaluate the watchpoint expression | |
1888 | now, we would get the old value, and therefore no change | |
1889 | would seem to have occurred. | |
1890 | ||
1891 | In order to make watchpoints work `right', we really need | |
1892 | to complete the memory write, and then evaluate the | |
1893 | watchpoint expression. The following code does that by | |
1894 | removing the watchpoint (actually, all watchpoints and | |
1895 | breakpoints), single-stepping the target, re-inserting | |
1896 | watchpoints, and then falling through to let normal | |
1897 | single-step processing handle proceed. Since this | |
1898 | includes evaluating watchpoints, things will come to a | |
1899 | stop in the correct manner. */ | |
1900 | ||
488f131b JB |
1901 | remove_breakpoints (); |
1902 | registers_changed (); | |
1903 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
c5aa993b | 1904 | |
488f131b JB |
1905 | ecs->waiton_ptid = ecs->ptid; |
1906 | ecs->wp = &(ecs->ws); | |
1907 | ecs->infwait_state = infwait_nonstep_watch_state; | |
1908 | prepare_to_wait (ecs); | |
1909 | return; | |
1910 | } | |
1911 | ||
1912 | /* It may be possible to simply continue after a watchpoint. */ | |
1913 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
00d4360e | 1914 | stopped_by_watchpoint = STOPPED_BY_WATCHPOINT (ecs->ws); |
488f131b JB |
1915 | |
1916 | ecs->stop_func_start = 0; | |
1917 | ecs->stop_func_end = 0; | |
1918 | ecs->stop_func_name = 0; | |
1919 | /* Don't care about return value; stop_func_start and stop_func_name | |
1920 | will both be 0 if it doesn't work. */ | |
1921 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
1922 | &ecs->stop_func_start, &ecs->stop_func_end); | |
1923 | ecs->stop_func_start += FUNCTION_START_OFFSET; | |
1924 | ecs->another_trap = 0; | |
1925 | bpstat_clear (&stop_bpstat); | |
1926 | stop_step = 0; | |
1927 | stop_stack_dummy = 0; | |
1928 | stop_print_frame = 1; | |
1929 | ecs->random_signal = 0; | |
1930 | stopped_by_random_signal = 0; | |
1931 | breakpoints_failed = 0; | |
1932 | ||
1933 | /* Look at the cause of the stop, and decide what to do. | |
1934 | The alternatives are: | |
1935 | 1) break; to really stop and return to the debugger, | |
1936 | 2) drop through to start up again | |
1937 | (set ecs->another_trap to 1 to single step once) | |
1938 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
1939 | will be made according to the signal handling tables. */ | |
1940 | ||
1941 | /* First, distinguish signals caused by the debugger from signals | |
03cebad2 MK |
1942 | that have to do with the program's own actions. Note that |
1943 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
1944 | on the operating system version. Here we detect when a SIGILL or | |
1945 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
1946 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
1947 | when we're trying to execute a breakpoint instruction on a | |
1948 | non-executable stack. This happens for call dummy breakpoints | |
1949 | for architectures like SPARC that place call dummies on the | |
1950 | stack. */ | |
488f131b JB |
1951 | |
1952 | if (stop_signal == TARGET_SIGNAL_TRAP | |
1953 | || (breakpoints_inserted && | |
1954 | (stop_signal == TARGET_SIGNAL_ILL | |
03cebad2 | 1955 | || stop_signal == TARGET_SIGNAL_SEGV |
c54cfec8 | 1956 | || stop_signal == TARGET_SIGNAL_EMT)) |
c0236d92 EZ |
1957 | || stop_soon == STOP_QUIETLY |
1958 | || stop_soon == STOP_QUIETLY_NO_SIGSTOP) | |
488f131b JB |
1959 | { |
1960 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1961 | { | |
1962 | stop_print_frame = 0; | |
1963 | stop_stepping (ecs); | |
1964 | return; | |
1965 | } | |
c54cfec8 EZ |
1966 | |
1967 | /* This is originated from start_remote(), start_inferior() and | |
1968 | shared libraries hook functions. */ | |
c0236d92 | 1969 | if (stop_soon == STOP_QUIETLY) |
488f131b JB |
1970 | { |
1971 | stop_stepping (ecs); | |
1972 | return; | |
1973 | } | |
1974 | ||
c54cfec8 EZ |
1975 | /* This originates from attach_command(). We need to overwrite |
1976 | the stop_signal here, because some kernels don't ignore a | |
1977 | SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call. | |
1978 | See more comments in inferior.h. */ | |
c0236d92 | 1979 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
c54cfec8 EZ |
1980 | { |
1981 | stop_stepping (ecs); | |
1982 | if (stop_signal == TARGET_SIGNAL_STOP) | |
1983 | stop_signal = TARGET_SIGNAL_0; | |
1984 | return; | |
1985 | } | |
1986 | ||
d303a6c7 AC |
1987 | /* Don't even think about breakpoints if just proceeded over a |
1988 | breakpoint. */ | |
1989 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected) | |
488f131b JB |
1990 | bpstat_clear (&stop_bpstat); |
1991 | else | |
1992 | { | |
1993 | /* See if there is a breakpoint at the current PC. */ | |
00d4360e UW |
1994 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, |
1995 | stopped_by_watchpoint); | |
488f131b | 1996 | |
488f131b JB |
1997 | /* Following in case break condition called a |
1998 | function. */ | |
1999 | stop_print_frame = 1; | |
2000 | } | |
2001 | ||
73dd234f AC |
2002 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
2003 | at one stage in the past included checks for an inferior | |
2004 | function call's call dummy's return breakpoint. The original | |
2005 | comment, that went with the test, read: | |
2006 | ||
2007 | ``End of a stack dummy. Some systems (e.g. Sony news) give | |
2008 | another signal besides SIGTRAP, so check here as well as | |
2009 | above.'' | |
2010 | ||
2011 | If someone ever tries to get get call dummys on a | |
2012 | non-executable stack to work (where the target would stop | |
03cebad2 MK |
2013 | with something like a SIGSEGV), then those tests might need |
2014 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 2015 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
2016 | suspect that it won't be the case. |
2017 | ||
2018 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to | |
2019 | be necessary for call dummies on a non-executable stack on | |
2020 | SPARC. */ | |
73dd234f | 2021 | |
488f131b JB |
2022 | if (stop_signal == TARGET_SIGNAL_TRAP) |
2023 | ecs->random_signal | |
2024 | = !(bpstat_explains_signal (stop_bpstat) | |
2025 | || trap_expected | |
488f131b | 2026 | || (step_range_end && step_resume_breakpoint == NULL)); |
488f131b JB |
2027 | else |
2028 | { | |
73dd234f | 2029 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
488f131b JB |
2030 | if (!ecs->random_signal) |
2031 | stop_signal = TARGET_SIGNAL_TRAP; | |
2032 | } | |
2033 | } | |
2034 | ||
2035 | /* When we reach this point, we've pretty much decided | |
2036 | that the reason for stopping must've been a random | |
2037 | (unexpected) signal. */ | |
2038 | ||
2039 | else | |
2040 | ecs->random_signal = 1; | |
488f131b | 2041 | |
04e68871 | 2042 | process_event_stop_test: |
488f131b JB |
2043 | /* For the program's own signals, act according to |
2044 | the signal handling tables. */ | |
2045 | ||
2046 | if (ecs->random_signal) | |
2047 | { | |
2048 | /* Signal not for debugging purposes. */ | |
2049 | int printed = 0; | |
2050 | ||
2051 | stopped_by_random_signal = 1; | |
2052 | ||
2053 | if (signal_print[stop_signal]) | |
2054 | { | |
2055 | printed = 1; | |
2056 | target_terminal_ours_for_output (); | |
2057 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
2058 | } | |
2059 | if (signal_stop[stop_signal]) | |
2060 | { | |
2061 | stop_stepping (ecs); | |
2062 | return; | |
2063 | } | |
2064 | /* If not going to stop, give terminal back | |
2065 | if we took it away. */ | |
2066 | else if (printed) | |
2067 | target_terminal_inferior (); | |
2068 | ||
2069 | /* Clear the signal if it should not be passed. */ | |
2070 | if (signal_program[stop_signal] == 0) | |
2071 | stop_signal = TARGET_SIGNAL_0; | |
2072 | ||
d303a6c7 AC |
2073 | if (step_range_end != 0 |
2074 | && stop_signal != TARGET_SIGNAL_0 | |
2075 | && stop_pc >= step_range_start && stop_pc < step_range_end | |
2076 | && frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id)) | |
2077 | { | |
2078 | /* The inferior is about to take a signal that will take it | |
2079 | out of the single step range. Set a breakpoint at the | |
2080 | current PC (which is presumably where the signal handler | |
2081 | will eventually return) and then allow the inferior to | |
2082 | run free. | |
2083 | ||
2084 | Note that this is only needed for a signal delivered | |
2085 | while in the single-step range. Nested signals aren't a | |
2086 | problem as they eventually all return. */ | |
2087 | insert_step_resume_breakpoint (get_current_frame (), ecs); | |
2088 | } | |
488f131b JB |
2089 | keep_going (ecs); |
2090 | return; | |
2091 | } | |
2092 | ||
2093 | /* Handle cases caused by hitting a breakpoint. */ | |
2094 | { | |
2095 | CORE_ADDR jmp_buf_pc; | |
2096 | struct bpstat_what what; | |
2097 | ||
2098 | what = bpstat_what (stop_bpstat); | |
2099 | ||
2100 | if (what.call_dummy) | |
2101 | { | |
2102 | stop_stack_dummy = 1; | |
2103 | #ifdef HP_OS_BUG | |
2104 | trap_expected_after_continue = 1; | |
2105 | #endif | |
c5aa993b | 2106 | } |
c906108c | 2107 | |
488f131b | 2108 | switch (what.main_action) |
c5aa993b | 2109 | { |
488f131b JB |
2110 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2111 | /* If we hit the breakpoint at longjmp, disable it for the | |
2112 | duration of this command. Then, install a temporary | |
2113 | breakpoint at the target of the jmp_buf. */ | |
2114 | disable_longjmp_breakpoint (); | |
2115 | remove_breakpoints (); | |
2116 | breakpoints_inserted = 0; | |
2117 | if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
c5aa993b | 2118 | { |
488f131b | 2119 | keep_going (ecs); |
104c1213 | 2120 | return; |
c5aa993b | 2121 | } |
488f131b JB |
2122 | |
2123 | /* Need to blow away step-resume breakpoint, as it | |
2124 | interferes with us */ | |
2125 | if (step_resume_breakpoint != NULL) | |
104c1213 | 2126 | { |
488f131b | 2127 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
104c1213 | 2128 | } |
c906108c | 2129 | |
488f131b JB |
2130 | #if 0 |
2131 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2132 | if (step_over_calls > 0) | |
2133 | set_longjmp_resume_breakpoint (jmp_buf_pc, get_current_frame ()); | |
c5aa993b | 2134 | else |
488f131b | 2135 | #endif /* 0 */ |
818dd999 | 2136 | set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
488f131b JB |
2137 | ecs->handling_longjmp = 1; /* FIXME */ |
2138 | keep_going (ecs); | |
2139 | return; | |
c906108c | 2140 | |
488f131b JB |
2141 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2142 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
2143 | remove_breakpoints (); | |
2144 | breakpoints_inserted = 0; | |
2145 | #if 0 | |
2146 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2147 | if (step_over_calls | |
aa0cd9c1 AC |
2148 | && (frame_id_inner (get_frame_id (get_current_frame ()), |
2149 | step_frame_id))) | |
c5aa993b | 2150 | { |
488f131b | 2151 | ecs->another_trap = 1; |
d4f3574e SS |
2152 | keep_going (ecs); |
2153 | return; | |
c5aa993b | 2154 | } |
488f131b JB |
2155 | #endif /* 0 */ |
2156 | disable_longjmp_breakpoint (); | |
2157 | ecs->handling_longjmp = 0; /* FIXME */ | |
2158 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2159 | break; | |
2160 | /* else fallthrough */ | |
2161 | ||
2162 | case BPSTAT_WHAT_SINGLE: | |
2163 | if (breakpoints_inserted) | |
c5aa993b | 2164 | { |
488f131b | 2165 | remove_breakpoints (); |
c5aa993b | 2166 | } |
488f131b JB |
2167 | breakpoints_inserted = 0; |
2168 | ecs->another_trap = 1; | |
2169 | /* Still need to check other stuff, at least the case | |
2170 | where we are stepping and step out of the right range. */ | |
2171 | break; | |
c906108c | 2172 | |
488f131b JB |
2173 | case BPSTAT_WHAT_STOP_NOISY: |
2174 | stop_print_frame = 1; | |
c906108c | 2175 | |
d303a6c7 AC |
2176 | /* We are about to nuke the step_resume_breakpointt via the |
2177 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2178 | |
488f131b JB |
2179 | stop_stepping (ecs); |
2180 | return; | |
c5aa993b | 2181 | |
488f131b JB |
2182 | case BPSTAT_WHAT_STOP_SILENT: |
2183 | stop_print_frame = 0; | |
c5aa993b | 2184 | |
d303a6c7 AC |
2185 | /* We are about to nuke the step_resume_breakpoin via the |
2186 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2187 | |
488f131b | 2188 | stop_stepping (ecs); |
e441088d | 2189 | return; |
c5aa993b | 2190 | |
488f131b JB |
2191 | case BPSTAT_WHAT_STEP_RESUME: |
2192 | /* This proably demands a more elegant solution, but, yeah | |
2193 | right... | |
c5aa993b | 2194 | |
488f131b JB |
2195 | This function's use of the simple variable |
2196 | step_resume_breakpoint doesn't seem to accomodate | |
2197 | simultaneously active step-resume bp's, although the | |
2198 | breakpoint list certainly can. | |
c5aa993b | 2199 | |
488f131b JB |
2200 | If we reach here and step_resume_breakpoint is already |
2201 | NULL, then apparently we have multiple active | |
2202 | step-resume bp's. We'll just delete the breakpoint we | |
2203 | stopped at, and carry on. | |
2204 | ||
2205 | Correction: what the code currently does is delete a | |
2206 | step-resume bp, but it makes no effort to ensure that | |
2207 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2208 | |
488f131b JB |
2209 | if (step_resume_breakpoint == NULL) |
2210 | { | |
2211 | step_resume_breakpoint = | |
2212 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2213 | } | |
2214 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
2215 | break; | |
2216 | ||
2217 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
488f131b JB |
2218 | /* If were waiting for a trap, hitting the step_resume_break |
2219 | doesn't count as getting it. */ | |
2220 | if (trap_expected) | |
2221 | ecs->another_trap = 1; | |
2222 | break; | |
2223 | ||
2224 | case BPSTAT_WHAT_CHECK_SHLIBS: | |
2225 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2226 | #ifdef SOLIB_ADD | |
c906108c | 2227 | { |
488f131b JB |
2228 | /* Remove breakpoints, we eventually want to step over the |
2229 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2230 | breakpoint addresses via breakpoint_re_set. */ | |
2231 | if (breakpoints_inserted) | |
2232 | remove_breakpoints (); | |
c5aa993b | 2233 | breakpoints_inserted = 0; |
488f131b JB |
2234 | |
2235 | /* Check for any newly added shared libraries if we're | |
2236 | supposed to be adding them automatically. Switch | |
2237 | terminal for any messages produced by | |
2238 | breakpoint_re_set. */ | |
2239 | target_terminal_ours_for_output (); | |
aff6338a AC |
2240 | /* NOTE: cagney/2003-11-25: Make certain that the target |
2241 | stack's section table is kept up-to-date. Architectures, | |
2242 | (e.g., PPC64), use the section table to perform | |
2243 | operations such as address => section name and hence | |
2244 | require the table to contain all sections (including | |
2245 | those found in shared libraries). */ | |
2246 | /* NOTE: cagney/2003-11-25: Pass current_target and not | |
2247 | exec_ops to SOLIB_ADD. This is because current GDB is | |
2248 | only tooled to propagate section_table changes out from | |
2249 | the "current_target" (see target_resize_to_sections), and | |
2250 | not up from the exec stratum. This, of course, isn't | |
2251 | right. "infrun.c" should only interact with the | |
2252 | exec/process stratum, instead relying on the target stack | |
2253 | to propagate relevant changes (stop, section table | |
2254 | changed, ...) up to other layers. */ | |
2255 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); | |
488f131b JB |
2256 | target_terminal_inferior (); |
2257 | ||
2258 | /* Try to reenable shared library breakpoints, additional | |
2259 | code segments in shared libraries might be mapped in now. */ | |
2260 | re_enable_breakpoints_in_shlibs (); | |
2261 | ||
2262 | /* If requested, stop when the dynamic linker notifies | |
2263 | gdb of events. This allows the user to get control | |
2264 | and place breakpoints in initializer routines for | |
2265 | dynamically loaded objects (among other things). */ | |
877522db | 2266 | if (stop_on_solib_events || stop_stack_dummy) |
d4f3574e | 2267 | { |
488f131b | 2268 | stop_stepping (ecs); |
d4f3574e SS |
2269 | return; |
2270 | } | |
c5aa993b | 2271 | |
488f131b JB |
2272 | /* If we stopped due to an explicit catchpoint, then the |
2273 | (see above) call to SOLIB_ADD pulled in any symbols | |
2274 | from a newly-loaded library, if appropriate. | |
2275 | ||
2276 | We do want the inferior to stop, but not where it is | |
2277 | now, which is in the dynamic linker callback. Rather, | |
2278 | we would like it stop in the user's program, just after | |
2279 | the call that caused this catchpoint to trigger. That | |
2280 | gives the user a more useful vantage from which to | |
2281 | examine their program's state. */ | |
2282 | else if (what.main_action == | |
2283 | BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
c906108c | 2284 | { |
488f131b JB |
2285 | /* ??rehrauer: If I could figure out how to get the |
2286 | right return PC from here, we could just set a temp | |
2287 | breakpoint and resume. I'm not sure we can without | |
2288 | cracking open the dld's shared libraries and sniffing | |
2289 | their unwind tables and text/data ranges, and that's | |
2290 | not a terribly portable notion. | |
2291 | ||
2292 | Until that time, we must step the inferior out of the | |
2293 | dld callback, and also out of the dld itself (and any | |
2294 | code or stubs in libdld.sl, such as "shl_load" and | |
2295 | friends) until we reach non-dld code. At that point, | |
2296 | we can stop stepping. */ | |
2297 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2298 | &ecs-> | |
2299 | stepping_through_solib_catchpoints); | |
2300 | ecs->stepping_through_solib_after_catch = 1; | |
2301 | ||
2302 | /* Be sure to lift all breakpoints, so the inferior does | |
2303 | actually step past this point... */ | |
2304 | ecs->another_trap = 1; | |
2305 | break; | |
c906108c | 2306 | } |
c5aa993b | 2307 | else |
c5aa993b | 2308 | { |
488f131b | 2309 | /* We want to step over this breakpoint, then keep going. */ |
c5aa993b | 2310 | ecs->another_trap = 1; |
488f131b | 2311 | break; |
c5aa993b | 2312 | } |
488f131b JB |
2313 | } |
2314 | #endif | |
2315 | break; | |
c906108c | 2316 | |
488f131b JB |
2317 | case BPSTAT_WHAT_LAST: |
2318 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2319 | |
488f131b JB |
2320 | case BPSTAT_WHAT_KEEP_CHECKING: |
2321 | break; | |
2322 | } | |
2323 | } | |
c906108c | 2324 | |
488f131b JB |
2325 | /* We come here if we hit a breakpoint but should not |
2326 | stop for it. Possibly we also were stepping | |
2327 | and should stop for that. So fall through and | |
2328 | test for stepping. But, if not stepping, | |
2329 | do not stop. */ | |
c906108c | 2330 | |
488f131b JB |
2331 | /* Are we stepping to get the inferior out of the dynamic |
2332 | linker's hook (and possibly the dld itself) after catching | |
2333 | a shlib event? */ | |
2334 | if (ecs->stepping_through_solib_after_catch) | |
2335 | { | |
2336 | #if defined(SOLIB_ADD) | |
2337 | /* Have we reached our destination? If not, keep going. */ | |
2338 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2339 | { | |
2340 | ecs->another_trap = 1; | |
2341 | keep_going (ecs); | |
104c1213 | 2342 | return; |
488f131b JB |
2343 | } |
2344 | #endif | |
2345 | /* Else, stop and report the catchpoint(s) whose triggering | |
2346 | caused us to begin stepping. */ | |
2347 | ecs->stepping_through_solib_after_catch = 0; | |
2348 | bpstat_clear (&stop_bpstat); | |
2349 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2350 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2351 | stop_print_frame = 1; | |
2352 | stop_stepping (ecs); | |
2353 | return; | |
2354 | } | |
c906108c | 2355 | |
488f131b JB |
2356 | if (step_resume_breakpoint) |
2357 | { | |
2358 | /* Having a step-resume breakpoint overrides anything | |
2359 | else having to do with stepping commands until | |
2360 | that breakpoint is reached. */ | |
488f131b JB |
2361 | keep_going (ecs); |
2362 | return; | |
2363 | } | |
c5aa993b | 2364 | |
488f131b JB |
2365 | if (step_range_end == 0) |
2366 | { | |
2367 | /* Likewise if we aren't even stepping. */ | |
488f131b JB |
2368 | keep_going (ecs); |
2369 | return; | |
2370 | } | |
c5aa993b | 2371 | |
488f131b | 2372 | /* If stepping through a line, keep going if still within it. |
c906108c | 2373 | |
488f131b JB |
2374 | Note that step_range_end is the address of the first instruction |
2375 | beyond the step range, and NOT the address of the last instruction | |
2376 | within it! */ | |
2377 | if (stop_pc >= step_range_start && stop_pc < step_range_end) | |
2378 | { | |
488f131b JB |
2379 | keep_going (ecs); |
2380 | return; | |
2381 | } | |
c5aa993b | 2382 | |
488f131b | 2383 | /* We stepped out of the stepping range. */ |
c906108c | 2384 | |
488f131b JB |
2385 | /* If we are stepping at the source level and entered the runtime |
2386 | loader dynamic symbol resolution code, we keep on single stepping | |
2387 | until we exit the run time loader code and reach the callee's | |
2388 | address. */ | |
2389 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2390 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) | |
2391 | { | |
4c8c40e6 MK |
2392 | CORE_ADDR pc_after_resolver = |
2393 | gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); | |
c906108c | 2394 | |
488f131b JB |
2395 | if (pc_after_resolver) |
2396 | { | |
2397 | /* Set up a step-resume breakpoint at the address | |
2398 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2399 | struct symtab_and_line sr_sal; | |
fe39c653 | 2400 | init_sal (&sr_sal); |
488f131b JB |
2401 | sr_sal.pc = pc_after_resolver; |
2402 | ||
2403 | check_for_old_step_resume_breakpoint (); | |
2404 | step_resume_breakpoint = | |
818dd999 | 2405 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
488f131b JB |
2406 | if (breakpoints_inserted) |
2407 | insert_breakpoints (); | |
c5aa993b | 2408 | } |
c906108c | 2409 | |
488f131b JB |
2410 | keep_going (ecs); |
2411 | return; | |
2412 | } | |
c906108c | 2413 | |
42edda50 AC |
2414 | if (step_range_end != 1 |
2415 | && (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2416 | || step_over_calls == STEP_OVER_ALL) | |
2417 | && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME) | |
488f131b | 2418 | { |
42edda50 AC |
2419 | /* The inferior, while doing a "step" or "next", has ended up in |
2420 | a signal trampoline (either by a signal being delivered or by | |
2421 | the signal handler returning). Just single-step until the | |
2422 | inferior leaves the trampoline (either by calling the handler | |
2423 | or returning). */ | |
488f131b JB |
2424 | keep_going (ecs); |
2425 | return; | |
2426 | } | |
c906108c | 2427 | |
0b30808c AC |
2428 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE |
2429 | && ecs->stop_func_name == NULL) | |
2430 | { | |
2431 | /* The inferior just stepped into, or returned to, an | |
2432 | undebuggable function (where there is no symbol, not even a | |
2433 | minimal symbol, corresponding to the address where the | |
2434 | inferior stopped). Since we want to skip this kind of code, | |
2435 | we keep going until the inferior returns from this | |
2436 | function. */ | |
2437 | /* NOTE: cagney/2004-05-12: This test is performed after the | |
2438 | sigtramp test as often sigtramps, while recognized by GDB, | |
2439 | have no symbol information. */ | |
2440 | handle_step_into_function (ecs); | |
2441 | return; | |
2442 | } | |
2443 | ||
4a72a2a6 | 2444 | if (frame_id_eq (frame_unwind_id (get_current_frame ()), |
a587af0b | 2445 | step_frame_id)) |
488f131b JB |
2446 | { |
2447 | /* It's a subroutine call. */ | |
1af510a8 | 2448 | handle_step_into_function (ecs); |
488f131b | 2449 | return; |
488f131b | 2450 | } |
c906108c | 2451 | |
488f131b | 2452 | /* We've wandered out of the step range. */ |
c906108c | 2453 | |
488f131b | 2454 | ecs->sal = find_pc_line (stop_pc, 0); |
c906108c | 2455 | |
488f131b JB |
2456 | if (step_range_end == 1) |
2457 | { | |
2458 | /* It is stepi or nexti. We always want to stop stepping after | |
2459 | one instruction. */ | |
2460 | stop_step = 1; | |
2461 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2462 | stop_stepping (ecs); | |
2463 | return; | |
2464 | } | |
c906108c | 2465 | |
488f131b JB |
2466 | /* If we're in the return path from a shared library trampoline, |
2467 | we want to proceed through the trampoline when stepping. */ | |
2468 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2469 | { | |
488f131b | 2470 | /* Determine where this trampoline returns. */ |
5cf4d23a | 2471 | CORE_ADDR real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); |
c906108c | 2472 | |
488f131b | 2473 | /* Only proceed through if we know where it's going. */ |
d764a824 | 2474 | if (real_stop_pc) |
488f131b JB |
2475 | { |
2476 | /* And put the step-breakpoint there and go until there. */ | |
2477 | struct symtab_and_line sr_sal; | |
2478 | ||
fe39c653 | 2479 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 2480 | sr_sal.pc = real_stop_pc; |
488f131b JB |
2481 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2482 | /* Do not specify what the fp should be when we stop | |
2483 | since on some machines the prologue | |
2484 | is where the new fp value is established. */ | |
2485 | check_for_old_step_resume_breakpoint (); | |
2486 | step_resume_breakpoint = | |
818dd999 | 2487 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
488f131b JB |
2488 | if (breakpoints_inserted) |
2489 | insert_breakpoints (); | |
c906108c | 2490 | |
488f131b JB |
2491 | /* Restart without fiddling with the step ranges or |
2492 | other state. */ | |
2493 | keep_going (ecs); | |
2494 | return; | |
2495 | } | |
2496 | } | |
c906108c | 2497 | |
488f131b JB |
2498 | if (ecs->sal.line == 0) |
2499 | { | |
2500 | /* We have no line number information. That means to stop | |
2501 | stepping (does this always happen right after one instruction, | |
2502 | when we do "s" in a function with no line numbers, | |
2503 | or can this happen as a result of a return or longjmp?). */ | |
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 ((stop_pc == ecs->sal.pc) |
2511 | && (ecs->current_line != ecs->sal.line | |
2512 | || ecs->current_symtab != ecs->sal.symtab)) | |
2513 | { | |
2514 | /* We are at the start of a different line. So stop. Note that | |
2515 | we don't stop if we step into the middle of a different line. | |
2516 | That is said to make things like for (;;) statements work | |
2517 | better. */ | |
2518 | stop_step = 1; | |
2519 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2520 | stop_stepping (ecs); | |
2521 | return; | |
2522 | } | |
c906108c | 2523 | |
488f131b | 2524 | /* We aren't done stepping. |
c906108c | 2525 | |
488f131b JB |
2526 | Optimize by setting the stepping range to the line. |
2527 | (We might not be in the original line, but if we entered a | |
2528 | new line in mid-statement, we continue stepping. This makes | |
2529 | things like for(;;) statements work better.) */ | |
c906108c | 2530 | |
488f131b | 2531 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
c5aa993b | 2532 | { |
488f131b JB |
2533 | /* If this is the last line of the function, don't keep stepping |
2534 | (it would probably step us out of the function). | |
2535 | This is particularly necessary for a one-line function, | |
2536 | in which after skipping the prologue we better stop even though | |
2537 | we will be in mid-line. */ | |
2538 | stop_step = 1; | |
2539 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2540 | stop_stepping (ecs); | |
2541 | return; | |
c5aa993b | 2542 | } |
488f131b JB |
2543 | step_range_start = ecs->sal.pc; |
2544 | step_range_end = ecs->sal.end; | |
aa0cd9c1 | 2545 | step_frame_id = get_frame_id (get_current_frame ()); |
488f131b JB |
2546 | ecs->current_line = ecs->sal.line; |
2547 | ecs->current_symtab = ecs->sal.symtab; | |
2548 | ||
aa0cd9c1 AC |
2549 | /* In the case where we just stepped out of a function into the |
2550 | middle of a line of the caller, continue stepping, but | |
2551 | step_frame_id must be modified to current frame */ | |
65815ea1 AC |
2552 | #if 0 |
2553 | /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too | |
2554 | generous. It will trigger on things like a step into a frameless | |
2555 | stackless leaf function. I think the logic should instead look | |
2556 | at the unwound frame ID has that should give a more robust | |
2557 | indication of what happened. */ | |
2558 | if (step-ID == current-ID) | |
2559 | still stepping in same function; | |
2560 | else if (step-ID == unwind (current-ID)) | |
2561 | stepped into a function; | |
2562 | else | |
2563 | stepped out of a function; | |
2564 | /* Of course this assumes that the frame ID unwind code is robust | |
2565 | and we're willing to introduce frame unwind logic into this | |
ce2826aa | 2566 | function. Fortunately, those days are nearly upon us. */ |
65815ea1 | 2567 | #endif |
488f131b | 2568 | { |
aa0cd9c1 AC |
2569 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
2570 | if (!(frame_id_inner (current_frame, step_frame_id))) | |
2571 | step_frame_id = current_frame; | |
488f131b | 2572 | } |
c906108c | 2573 | |
488f131b | 2574 | keep_going (ecs); |
104c1213 JM |
2575 | } |
2576 | ||
2577 | /* Are we in the middle of stepping? */ | |
2578 | ||
2579 | static int | |
2580 | currently_stepping (struct execution_control_state *ecs) | |
2581 | { | |
d303a6c7 | 2582 | return ((!ecs->handling_longjmp |
104c1213 JM |
2583 | && ((step_range_end && step_resume_breakpoint == NULL) |
2584 | || trap_expected)) | |
2585 | || ecs->stepping_through_solib_after_catch | |
2586 | || bpstat_should_step ()); | |
2587 | } | |
c906108c | 2588 | |
c2c6d25f JM |
2589 | /* Subroutine call with source code we should not step over. Do step |
2590 | to the first line of code in it. */ | |
2591 | ||
2592 | static void | |
2593 | step_into_function (struct execution_control_state *ecs) | |
2594 | { | |
2595 | struct symtab *s; | |
2596 | struct symtab_and_line sr_sal; | |
2597 | ||
2598 | s = find_pc_symtab (stop_pc); | |
2599 | if (s && s->language != language_asm) | |
2600 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
2601 | ||
2602 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2603 | /* Use the step_resume_break to step until the end of the prologue, | |
2604 | even if that involves jumps (as it seems to on the vax under | |
2605 | 4.2). */ | |
2606 | /* If the prologue ends in the middle of a source line, continue to | |
2607 | the end of that source line (if it is still within the function). | |
2608 | Otherwise, just go to end of prologue. */ | |
c2c6d25f JM |
2609 | if (ecs->sal.end |
2610 | && ecs->sal.pc != ecs->stop_func_start | |
2611 | && ecs->sal.end < ecs->stop_func_end) | |
2612 | ecs->stop_func_start = ecs->sal.end; | |
c2c6d25f | 2613 | |
2dbd5e30 KB |
2614 | /* Architectures which require breakpoint adjustment might not be able |
2615 | to place a breakpoint at the computed address. If so, the test | |
2616 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
2617 | ecs->stop_func_start to an address at which a breakpoint may be | |
2618 | legitimately placed. | |
2619 | ||
2620 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not | |
2621 | made, GDB will enter an infinite loop when stepping through | |
2622 | optimized code consisting of VLIW instructions which contain | |
2623 | subinstructions corresponding to different source lines. On | |
2624 | FR-V, it's not permitted to place a breakpoint on any but the | |
2625 | first subinstruction of a VLIW instruction. When a breakpoint is | |
2626 | set, GDB will adjust the breakpoint address to the beginning of | |
2627 | the VLIW instruction. Thus, we need to make the corresponding | |
2628 | adjustment here when computing the stop address. */ | |
2629 | ||
2630 | if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) | |
2631 | { | |
2632 | ecs->stop_func_start | |
2633 | = gdbarch_adjust_breakpoint_address (current_gdbarch, | |
2634 | ecs->stop_func_start); | |
2635 | } | |
2636 | ||
c2c6d25f JM |
2637 | if (ecs->stop_func_start == stop_pc) |
2638 | { | |
2639 | /* We are already there: stop now. */ | |
2640 | stop_step = 1; | |
488f131b | 2641 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2642 | stop_stepping (ecs); |
2643 | return; | |
2644 | } | |
2645 | else | |
2646 | { | |
2647 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 2648 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
2649 | sr_sal.pc = ecs->stop_func_start; |
2650 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
2651 | /* Do not specify what the fp should be when we stop since on | |
488f131b JB |
2652 | some machines the prologue is where the new fp value is |
2653 | established. */ | |
c2c6d25f JM |
2654 | check_for_old_step_resume_breakpoint (); |
2655 | step_resume_breakpoint = | |
818dd999 | 2656 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
c2c6d25f JM |
2657 | if (breakpoints_inserted) |
2658 | insert_breakpoints (); | |
2659 | ||
2660 | /* And make sure stepping stops right away then. */ | |
2661 | step_range_end = step_range_start; | |
2662 | } | |
2663 | keep_going (ecs); | |
2664 | } | |
d4f3574e | 2665 | |
d303a6c7 AC |
2666 | /* The inferior, as a result of a function call (has left) or signal |
2667 | (about to leave) the single-step range. Set a momentary breakpoint | |
2668 | within the step range where the inferior is expected to later | |
2669 | return. */ | |
2670 | ||
2671 | static void | |
2672 | insert_step_resume_breakpoint (struct frame_info *step_frame, | |
2673 | struct execution_control_state *ecs) | |
2674 | { | |
2675 | struct symtab_and_line sr_sal; | |
2676 | ||
2677 | /* This is only used within the step-resume range/frame. */ | |
2678 | gdb_assert (frame_id_eq (step_frame_id, get_frame_id (step_frame))); | |
2679 | gdb_assert (step_range_end != 0); | |
922d5ae0 AC |
2680 | /* Remember, if the call instruction is the last in the step range, |
2681 | the breakpoint will land just beyond that. Hence ``<= | |
2682 | step_range_end''. Also, ignore check when "nexti". */ | |
2683 | gdb_assert (step_range_start == step_range_end | |
2684 | || (get_frame_pc (step_frame) >= step_range_start | |
2685 | && get_frame_pc (step_frame) <= step_range_end)); | |
d303a6c7 AC |
2686 | |
2687 | init_sal (&sr_sal); /* initialize to zeros */ | |
2688 | ||
2689 | sr_sal.pc = ADDR_BITS_REMOVE (get_frame_pc (step_frame)); | |
2690 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2691 | ||
2692 | check_for_old_step_resume_breakpoint (); | |
2693 | ||
2694 | step_resume_breakpoint | |
2695 | = set_momentary_breakpoint (sr_sal, get_frame_id (step_frame), | |
2696 | bp_step_resume); | |
2697 | ||
2698 | if (breakpoints_inserted) | |
2699 | insert_breakpoints (); | |
2700 | } | |
2701 | ||
104c1213 JM |
2702 | static void |
2703 | stop_stepping (struct execution_control_state *ecs) | |
2704 | { | |
cd0fc7c3 SS |
2705 | /* Let callers know we don't want to wait for the inferior anymore. */ |
2706 | ecs->wait_some_more = 0; | |
2707 | } | |
2708 | ||
d4f3574e SS |
2709 | /* This function handles various cases where we need to continue |
2710 | waiting for the inferior. */ | |
2711 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
2712 | ||
2713 | static void | |
2714 | keep_going (struct execution_control_state *ecs) | |
2715 | { | |
d4f3574e | 2716 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 2717 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e | 2718 | |
d4f3574e SS |
2719 | /* If we did not do break;, it means we should keep running the |
2720 | inferior and not return to debugger. */ | |
2721 | ||
2722 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
2723 | { | |
2724 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
2725 | the inferior, else we'd have done a break above) and we |
2726 | haven't yet gotten our trap. Simply continue. */ | |
d4f3574e SS |
2727 | resume (currently_stepping (ecs), stop_signal); |
2728 | } | |
2729 | else | |
2730 | { | |
2731 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
2732 | anyway (the user asked that this signal be passed to the |
2733 | child) | |
2734 | -- or -- | |
2735 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2736 | decided we should resume from it. | |
d4f3574e | 2737 | |
488f131b | 2738 | We're going to run this baby now! |
d4f3574e | 2739 | |
488f131b JB |
2740 | Insert breakpoints now, unless we are trying to one-proceed |
2741 | past a breakpoint. */ | |
d4f3574e | 2742 | /* If we've just finished a special step resume and we don't |
488f131b | 2743 | want to hit a breakpoint, pull em out. */ |
d4f3574e | 2744 | if (step_resume_breakpoint == NULL |
d4f3574e SS |
2745 | && ecs->remove_breakpoints_on_following_step) |
2746 | { | |
2747 | ecs->remove_breakpoints_on_following_step = 0; | |
2748 | remove_breakpoints (); | |
2749 | breakpoints_inserted = 0; | |
2750 | } | |
d303a6c7 | 2751 | else if (!breakpoints_inserted && !ecs->another_trap) |
d4f3574e SS |
2752 | { |
2753 | breakpoints_failed = insert_breakpoints (); | |
2754 | if (breakpoints_failed) | |
2755 | { | |
2756 | stop_stepping (ecs); | |
2757 | return; | |
2758 | } | |
2759 | breakpoints_inserted = 1; | |
2760 | } | |
2761 | ||
2762 | trap_expected = ecs->another_trap; | |
2763 | ||
2764 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
2765 | specifies that such a signal should be delivered to the |
2766 | target program). | |
2767 | ||
2768 | Typically, this would occure when a user is debugging a | |
2769 | target monitor on a simulator: the target monitor sets a | |
2770 | breakpoint; the simulator encounters this break-point and | |
2771 | halts the simulation handing control to GDB; GDB, noteing | |
2772 | that the break-point isn't valid, returns control back to the | |
2773 | simulator; the simulator then delivers the hardware | |
2774 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
2775 | ||
2776 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
2777 | stop_signal = TARGET_SIGNAL_0; |
2778 | ||
d4f3574e SS |
2779 | |
2780 | resume (currently_stepping (ecs), stop_signal); | |
2781 | } | |
2782 | ||
488f131b | 2783 | prepare_to_wait (ecs); |
d4f3574e SS |
2784 | } |
2785 | ||
104c1213 JM |
2786 | /* This function normally comes after a resume, before |
2787 | handle_inferior_event exits. It takes care of any last bits of | |
2788 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 2789 | |
104c1213 JM |
2790 | static void |
2791 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 2792 | { |
104c1213 JM |
2793 | if (ecs->infwait_state == infwait_normal_state) |
2794 | { | |
2795 | overlay_cache_invalid = 1; | |
2796 | ||
2797 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
2798 | target_wait because they can be loaded from the target while |
2799 | in target_wait. This makes remote debugging a bit more | |
2800 | efficient for those targets that provide critical registers | |
2801 | as part of their normal status mechanism. */ | |
104c1213 JM |
2802 | |
2803 | registers_changed (); | |
39f77062 | 2804 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
2805 | ecs->wp = &(ecs->ws); |
2806 | } | |
2807 | /* This is the old end of the while loop. Let everybody know we | |
2808 | want to wait for the inferior some more and get called again | |
2809 | soon. */ | |
2810 | ecs->wait_some_more = 1; | |
c906108c | 2811 | } |
11cf8741 JM |
2812 | |
2813 | /* Print why the inferior has stopped. We always print something when | |
2814 | the inferior exits, or receives a signal. The rest of the cases are | |
2815 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
2816 | there should be a call to this function from handle_inferior_event() | |
2817 | each time stop_stepping() is called.*/ | |
2818 | static void | |
2819 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
2820 | { | |
2821 | switch (stop_reason) | |
2822 | { | |
2823 | case STOP_UNKNOWN: | |
2824 | /* We don't deal with these cases from handle_inferior_event() | |
2825 | yet. */ | |
2826 | break; | |
2827 | case END_STEPPING_RANGE: | |
2828 | /* We are done with a step/next/si/ni command. */ | |
2829 | /* For now print nothing. */ | |
fb40c209 | 2830 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 2831 | operation for n > 1 */ |
fb40c209 | 2832 | if (!step_multi || !stop_step) |
9dc5e2a9 | 2833 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2834 | ui_out_field_string (uiout, "reason", "end-stepping-range"); |
11cf8741 JM |
2835 | break; |
2836 | case BREAKPOINT_HIT: | |
2837 | /* We found a breakpoint. */ | |
2838 | /* For now print nothing. */ | |
2839 | break; | |
2840 | case SIGNAL_EXITED: | |
2841 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 2842 | annotate_signalled (); |
9dc5e2a9 | 2843 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2844 | ui_out_field_string (uiout, "reason", "exited-signalled"); |
8b93c638 JM |
2845 | ui_out_text (uiout, "\nProgram terminated with signal "); |
2846 | annotate_signal_name (); | |
488f131b JB |
2847 | ui_out_field_string (uiout, "signal-name", |
2848 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2849 | annotate_signal_name_end (); |
2850 | ui_out_text (uiout, ", "); | |
2851 | annotate_signal_string (); | |
488f131b JB |
2852 | ui_out_field_string (uiout, "signal-meaning", |
2853 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2854 | annotate_signal_string_end (); |
2855 | ui_out_text (uiout, ".\n"); | |
2856 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
2857 | break; |
2858 | case EXITED: | |
2859 | /* The inferior program is finished. */ | |
8b93c638 JM |
2860 | annotate_exited (stop_info); |
2861 | if (stop_info) | |
2862 | { | |
9dc5e2a9 | 2863 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2864 | ui_out_field_string (uiout, "reason", "exited"); |
8b93c638 | 2865 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
2866 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
2867 | (unsigned int) stop_info); | |
8b93c638 JM |
2868 | ui_out_text (uiout, ".\n"); |
2869 | } | |
2870 | else | |
2871 | { | |
9dc5e2a9 | 2872 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2873 | ui_out_field_string (uiout, "reason", "exited-normally"); |
8b93c638 JM |
2874 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
2875 | } | |
11cf8741 JM |
2876 | break; |
2877 | case SIGNAL_RECEIVED: | |
2878 | /* Signal received. The signal table tells us to print about | |
2879 | it. */ | |
8b93c638 JM |
2880 | annotate_signal (); |
2881 | ui_out_text (uiout, "\nProgram received signal "); | |
2882 | annotate_signal_name (); | |
84c6c83c KS |
2883 | if (ui_out_is_mi_like_p (uiout)) |
2884 | ui_out_field_string (uiout, "reason", "signal-received"); | |
488f131b JB |
2885 | ui_out_field_string (uiout, "signal-name", |
2886 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2887 | annotate_signal_name_end (); |
2888 | ui_out_text (uiout, ", "); | |
2889 | annotate_signal_string (); | |
488f131b JB |
2890 | ui_out_field_string (uiout, "signal-meaning", |
2891 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2892 | annotate_signal_string_end (); |
2893 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
2894 | break; |
2895 | default: | |
8e65ff28 AC |
2896 | internal_error (__FILE__, __LINE__, |
2897 | "print_stop_reason: unrecognized enum value"); | |
11cf8741 JM |
2898 | break; |
2899 | } | |
2900 | } | |
c906108c | 2901 | \f |
43ff13b4 | 2902 | |
c906108c SS |
2903 | /* Here to return control to GDB when the inferior stops for real. |
2904 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
2905 | ||
2906 | STOP_PRINT_FRAME nonzero means print the executing frame | |
2907 | (pc, function, args, file, line number and line text). | |
2908 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
2909 | attempting to insert breakpoints. */ | |
2910 | ||
2911 | void | |
96baa820 | 2912 | normal_stop (void) |
c906108c | 2913 | { |
73b65bb0 DJ |
2914 | struct target_waitstatus last; |
2915 | ptid_t last_ptid; | |
2916 | ||
2917 | get_last_target_status (&last_ptid, &last); | |
2918 | ||
c906108c SS |
2919 | /* As with the notification of thread events, we want to delay |
2920 | notifying the user that we've switched thread context until | |
2921 | the inferior actually stops. | |
2922 | ||
73b65bb0 DJ |
2923 | There's no point in saying anything if the inferior has exited. |
2924 | Note that SIGNALLED here means "exited with a signal", not | |
2925 | "received a signal". */ | |
488f131b | 2926 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
73b65bb0 DJ |
2927 | && target_has_execution |
2928 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
2929 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
2930 | { |
2931 | target_terminal_ours_for_output (); | |
c3f6f71d | 2932 | printf_filtered ("[Switching to %s]\n", |
39f77062 KB |
2933 | target_pid_or_tid_to_str (inferior_ptid)); |
2934 | previous_inferior_ptid = inferior_ptid; | |
c906108c | 2935 | } |
c906108c | 2936 | |
4fa8626c | 2937 | /* NOTE drow/2004-01-17: Is this still necessary? */ |
c906108c SS |
2938 | /* Make sure that the current_frame's pc is correct. This |
2939 | is a correction for setting up the frame info before doing | |
2940 | DECR_PC_AFTER_BREAK */ | |
b87efeee AC |
2941 | if (target_has_execution) |
2942 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to | |
2943 | DECR_PC_AFTER_BREAK, the program counter can change. Ask the | |
2944 | frame code to check for this and sort out any resultant mess. | |
2945 | DECR_PC_AFTER_BREAK needs to just go away. */ | |
2f107107 | 2946 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
c906108c | 2947 | |
c906108c SS |
2948 | if (target_has_execution && breakpoints_inserted) |
2949 | { | |
2950 | if (remove_breakpoints ()) | |
2951 | { | |
2952 | target_terminal_ours_for_output (); | |
2953 | printf_filtered ("Cannot remove breakpoints because "); | |
2954 | printf_filtered ("program is no longer writable.\n"); | |
2955 | printf_filtered ("It might be running in another process.\n"); | |
2956 | printf_filtered ("Further execution is probably impossible.\n"); | |
2957 | } | |
2958 | } | |
2959 | breakpoints_inserted = 0; | |
2960 | ||
2961 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
2962 | Delete any breakpoint that is to be deleted at the next stop. */ | |
2963 | ||
2964 | breakpoint_auto_delete (stop_bpstat); | |
2965 | ||
2966 | /* If an auto-display called a function and that got a signal, | |
2967 | delete that auto-display to avoid an infinite recursion. */ | |
2968 | ||
2969 | if (stopped_by_random_signal) | |
2970 | disable_current_display (); | |
2971 | ||
2972 | /* Don't print a message if in the middle of doing a "step n" | |
2973 | operation for n > 1 */ | |
2974 | if (step_multi && stop_step) | |
2975 | goto done; | |
2976 | ||
2977 | target_terminal_ours (); | |
2978 | ||
5913bcb0 AC |
2979 | /* Look up the hook_stop and run it (CLI internally handles problem |
2980 | of stop_command's pre-hook not existing). */ | |
2981 | if (stop_command) | |
2982 | catch_errors (hook_stop_stub, stop_command, | |
2983 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
2984 | |
2985 | if (!target_has_stack) | |
2986 | { | |
2987 | ||
2988 | goto done; | |
2989 | } | |
2990 | ||
2991 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
2992 | and current location is based on that. | |
2993 | Don't do this on return from a stack dummy routine, | |
2994 | or if the program has exited. */ | |
2995 | ||
2996 | if (!stop_stack_dummy) | |
2997 | { | |
0f7d239c | 2998 | select_frame (get_current_frame ()); |
c906108c SS |
2999 | |
3000 | /* Print current location without a level number, if | |
c5aa993b JM |
3001 | we have changed functions or hit a breakpoint. |
3002 | Print source line if we have one. | |
3003 | bpstat_print() contains the logic deciding in detail | |
3004 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3005 | |
6e7f8b9c | 3006 | if (stop_print_frame && deprecated_selected_frame) |
c906108c SS |
3007 | { |
3008 | int bpstat_ret; | |
3009 | int source_flag; | |
917317f4 | 3010 | int do_frame_printing = 1; |
c906108c SS |
3011 | |
3012 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3013 | switch (bpstat_ret) |
3014 | { | |
3015 | case PRINT_UNKNOWN: | |
aa0cd9c1 AC |
3016 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
3017 | (or should) carry around the function and does (or | |
3018 | should) use that when doing a frame comparison. */ | |
917317f4 | 3019 | if (stop_step |
aa0cd9c1 AC |
3020 | && frame_id_eq (step_frame_id, |
3021 | get_frame_id (get_current_frame ())) | |
917317f4 | 3022 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3023 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3024 | else |
488f131b | 3025 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3026 | break; |
3027 | case PRINT_SRC_AND_LOC: | |
488f131b | 3028 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3029 | break; |
3030 | case PRINT_SRC_ONLY: | |
c5394b80 | 3031 | source_flag = SRC_LINE; |
917317f4 JM |
3032 | break; |
3033 | case PRINT_NOTHING: | |
488f131b | 3034 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3035 | do_frame_printing = 0; |
3036 | break; | |
3037 | default: | |
488f131b | 3038 | internal_error (__FILE__, __LINE__, "Unknown value."); |
917317f4 | 3039 | } |
fb40c209 | 3040 | /* For mi, have the same behavior every time we stop: |
488f131b | 3041 | print everything but the source line. */ |
9dc5e2a9 | 3042 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3043 | source_flag = LOC_AND_ADDRESS; |
c906108c | 3044 | |
9dc5e2a9 | 3045 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 | 3046 | ui_out_field_int (uiout, "thread-id", |
488f131b | 3047 | pid_to_thread_id (inferior_ptid)); |
c906108c SS |
3048 | /* The behavior of this routine with respect to the source |
3049 | flag is: | |
c5394b80 JM |
3050 | SRC_LINE: Print only source line |
3051 | LOCATION: Print only location | |
3052 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3053 | if (do_frame_printing) |
0faf0076 | 3054 | print_stack_frame (get_selected_frame (), 0, source_flag); |
c906108c SS |
3055 | |
3056 | /* Display the auto-display expressions. */ | |
3057 | do_displays (); | |
3058 | } | |
3059 | } | |
3060 | ||
3061 | /* Save the function value return registers, if we care. | |
3062 | We might be about to restore their previous contents. */ | |
3063 | if (proceed_to_finish) | |
72cec141 AC |
3064 | /* NB: The copy goes through to the target picking up the value of |
3065 | all the registers. */ | |
3066 | regcache_cpy (stop_registers, current_regcache); | |
c906108c SS |
3067 | |
3068 | if (stop_stack_dummy) | |
3069 | { | |
dbe9fe58 AC |
3070 | /* Pop the empty frame that contains the stack dummy. POP_FRAME |
3071 | ends with a setting of the current frame, so we can use that | |
3072 | next. */ | |
3073 | frame_pop (get_current_frame ()); | |
c906108c | 3074 | /* Set stop_pc to what it was before we called the function. |
c5aa993b JM |
3075 | Can't rely on restore_inferior_status because that only gets |
3076 | called if we don't stop in the called function. */ | |
c906108c | 3077 | stop_pc = read_pc (); |
0f7d239c | 3078 | select_frame (get_current_frame ()); |
c906108c SS |
3079 | } |
3080 | ||
c906108c SS |
3081 | done: |
3082 | annotate_stopped (); | |
7a464420 | 3083 | observer_notify_normal_stop (stop_bpstat); |
c906108c SS |
3084 | } |
3085 | ||
3086 | static int | |
96baa820 | 3087 | hook_stop_stub (void *cmd) |
c906108c | 3088 | { |
5913bcb0 | 3089 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3090 | return (0); |
3091 | } | |
3092 | \f | |
c5aa993b | 3093 | int |
96baa820 | 3094 | signal_stop_state (int signo) |
c906108c SS |
3095 | { |
3096 | return signal_stop[signo]; | |
3097 | } | |
3098 | ||
c5aa993b | 3099 | int |
96baa820 | 3100 | signal_print_state (int signo) |
c906108c SS |
3101 | { |
3102 | return signal_print[signo]; | |
3103 | } | |
3104 | ||
c5aa993b | 3105 | int |
96baa820 | 3106 | signal_pass_state (int signo) |
c906108c SS |
3107 | { |
3108 | return signal_program[signo]; | |
3109 | } | |
3110 | ||
488f131b | 3111 | int |
7bda5e4a | 3112 | signal_stop_update (int signo, int state) |
d4f3574e SS |
3113 | { |
3114 | int ret = signal_stop[signo]; | |
3115 | signal_stop[signo] = state; | |
3116 | return ret; | |
3117 | } | |
3118 | ||
488f131b | 3119 | int |
7bda5e4a | 3120 | signal_print_update (int signo, int state) |
d4f3574e SS |
3121 | { |
3122 | int ret = signal_print[signo]; | |
3123 | signal_print[signo] = state; | |
3124 | return ret; | |
3125 | } | |
3126 | ||
488f131b | 3127 | int |
7bda5e4a | 3128 | signal_pass_update (int signo, int state) |
d4f3574e SS |
3129 | { |
3130 | int ret = signal_program[signo]; | |
3131 | signal_program[signo] = state; | |
3132 | return ret; | |
3133 | } | |
3134 | ||
c906108c | 3135 | static void |
96baa820 | 3136 | sig_print_header (void) |
c906108c SS |
3137 | { |
3138 | printf_filtered ("\ | |
3139 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3140 | } | |
3141 | ||
3142 | static void | |
96baa820 | 3143 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3144 | { |
3145 | char *name = target_signal_to_name (oursig); | |
3146 | int name_padding = 13 - strlen (name); | |
96baa820 | 3147 | |
c906108c SS |
3148 | if (name_padding <= 0) |
3149 | name_padding = 0; | |
3150 | ||
3151 | printf_filtered ("%s", name); | |
488f131b | 3152 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
3153 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3154 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3155 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3156 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3157 | } | |
3158 | ||
3159 | /* Specify how various signals in the inferior should be handled. */ | |
3160 | ||
3161 | static void | |
96baa820 | 3162 | handle_command (char *args, int from_tty) |
c906108c SS |
3163 | { |
3164 | char **argv; | |
3165 | int digits, wordlen; | |
3166 | int sigfirst, signum, siglast; | |
3167 | enum target_signal oursig; | |
3168 | int allsigs; | |
3169 | int nsigs; | |
3170 | unsigned char *sigs; | |
3171 | struct cleanup *old_chain; | |
3172 | ||
3173 | if (args == NULL) | |
3174 | { | |
3175 | error_no_arg ("signal to handle"); | |
3176 | } | |
3177 | ||
3178 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3179 | ||
3180 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3181 | sigs = (unsigned char *) alloca (nsigs); | |
3182 | memset (sigs, 0, nsigs); | |
3183 | ||
3184 | /* Break the command line up into args. */ | |
3185 | ||
3186 | argv = buildargv (args); | |
3187 | if (argv == NULL) | |
3188 | { | |
3189 | nomem (0); | |
3190 | } | |
7a292a7a | 3191 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3192 | |
3193 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3194 | actions. Signal numbers and signal names may be interspersed with | |
3195 | actions, with the actions being performed for all signals cumulatively | |
3196 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3197 | ||
3198 | while (*argv != NULL) | |
3199 | { | |
3200 | wordlen = strlen (*argv); | |
3201 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3202 | {; | |
3203 | } | |
3204 | allsigs = 0; | |
3205 | sigfirst = siglast = -1; | |
3206 | ||
3207 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3208 | { | |
3209 | /* Apply action to all signals except those used by the | |
3210 | debugger. Silently skip those. */ | |
3211 | allsigs = 1; | |
3212 | sigfirst = 0; | |
3213 | siglast = nsigs - 1; | |
3214 | } | |
3215 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3216 | { | |
3217 | SET_SIGS (nsigs, sigs, signal_stop); | |
3218 | SET_SIGS (nsigs, sigs, signal_print); | |
3219 | } | |
3220 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3221 | { | |
3222 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3223 | } | |
3224 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3225 | { | |
3226 | SET_SIGS (nsigs, sigs, signal_print); | |
3227 | } | |
3228 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3229 | { | |
3230 | SET_SIGS (nsigs, sigs, signal_program); | |
3231 | } | |
3232 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3233 | { | |
3234 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3235 | } | |
3236 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3237 | { | |
3238 | SET_SIGS (nsigs, sigs, signal_program); | |
3239 | } | |
3240 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3241 | { | |
3242 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3243 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3244 | } | |
3245 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3246 | { | |
3247 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3248 | } | |
3249 | else if (digits > 0) | |
3250 | { | |
3251 | /* It is numeric. The numeric signal refers to our own | |
3252 | internal signal numbering from target.h, not to host/target | |
3253 | signal number. This is a feature; users really should be | |
3254 | using symbolic names anyway, and the common ones like | |
3255 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3256 | ||
3257 | sigfirst = siglast = (int) | |
3258 | target_signal_from_command (atoi (*argv)); | |
3259 | if ((*argv)[digits] == '-') | |
3260 | { | |
3261 | siglast = (int) | |
3262 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3263 | } | |
3264 | if (sigfirst > siglast) | |
3265 | { | |
3266 | /* Bet he didn't figure we'd think of this case... */ | |
3267 | signum = sigfirst; | |
3268 | sigfirst = siglast; | |
3269 | siglast = signum; | |
3270 | } | |
3271 | } | |
3272 | else | |
3273 | { | |
3274 | oursig = target_signal_from_name (*argv); | |
3275 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3276 | { | |
3277 | sigfirst = siglast = (int) oursig; | |
3278 | } | |
3279 | else | |
3280 | { | |
3281 | /* Not a number and not a recognized flag word => complain. */ | |
3282 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3283 | } | |
3284 | } | |
3285 | ||
3286 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3287 | which signals to apply actions to. */ |
c906108c SS |
3288 | |
3289 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3290 | { | |
3291 | switch ((enum target_signal) signum) | |
3292 | { | |
3293 | case TARGET_SIGNAL_TRAP: | |
3294 | case TARGET_SIGNAL_INT: | |
3295 | if (!allsigs && !sigs[signum]) | |
3296 | { | |
3297 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 3298 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
3299 | { |
3300 | sigs[signum] = 1; | |
3301 | } | |
3302 | else | |
3303 | { | |
3304 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3305 | gdb_flush (gdb_stdout); | |
3306 | } | |
3307 | } | |
3308 | break; | |
3309 | case TARGET_SIGNAL_0: | |
3310 | case TARGET_SIGNAL_DEFAULT: | |
3311 | case TARGET_SIGNAL_UNKNOWN: | |
3312 | /* Make sure that "all" doesn't print these. */ | |
3313 | break; | |
3314 | default: | |
3315 | sigs[signum] = 1; | |
3316 | break; | |
3317 | } | |
3318 | } | |
3319 | ||
3320 | argv++; | |
3321 | } | |
3322 | ||
39f77062 | 3323 | target_notice_signals (inferior_ptid); |
c906108c SS |
3324 | |
3325 | if (from_tty) | |
3326 | { | |
3327 | /* Show the results. */ | |
3328 | sig_print_header (); | |
3329 | for (signum = 0; signum < nsigs; signum++) | |
3330 | { | |
3331 | if (sigs[signum]) | |
3332 | { | |
3333 | sig_print_info (signum); | |
3334 | } | |
3335 | } | |
3336 | } | |
3337 | ||
3338 | do_cleanups (old_chain); | |
3339 | } | |
3340 | ||
3341 | static void | |
96baa820 | 3342 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3343 | { |
3344 | char **argv; | |
3345 | struct cleanup *old_chain; | |
3346 | ||
3347 | /* Break the command line up into args. */ | |
3348 | ||
3349 | argv = buildargv (args); | |
3350 | if (argv == NULL) | |
3351 | { | |
3352 | nomem (0); | |
3353 | } | |
7a292a7a | 3354 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3355 | if (argv[1] != (char *) NULL) |
3356 | { | |
3357 | char *argBuf; | |
3358 | int bufLen; | |
3359 | ||
3360 | bufLen = strlen (argv[0]) + 20; | |
3361 | argBuf = (char *) xmalloc (bufLen); | |
3362 | if (argBuf) | |
3363 | { | |
3364 | int validFlag = 1; | |
3365 | enum target_signal oursig; | |
3366 | ||
3367 | oursig = target_signal_from_name (argv[0]); | |
3368 | memset (argBuf, 0, bufLen); | |
3369 | if (strcmp (argv[1], "Q") == 0) | |
3370 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3371 | else | |
3372 | { | |
3373 | if (strcmp (argv[1], "s") == 0) | |
3374 | { | |
3375 | if (!signal_stop[oursig]) | |
3376 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3377 | else | |
3378 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3379 | } | |
3380 | else if (strcmp (argv[1], "i") == 0) | |
3381 | { | |
3382 | if (!signal_program[oursig]) | |
3383 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3384 | else | |
3385 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3386 | } | |
3387 | else if (strcmp (argv[1], "r") == 0) | |
3388 | { | |
3389 | if (!signal_print[oursig]) | |
3390 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3391 | else | |
3392 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3393 | } | |
3394 | else | |
3395 | validFlag = 0; | |
3396 | } | |
3397 | if (validFlag) | |
3398 | handle_command (argBuf, from_tty); | |
3399 | else | |
3400 | printf_filtered ("Invalid signal handling flag.\n"); | |
3401 | if (argBuf) | |
b8c9b27d | 3402 | xfree (argBuf); |
c906108c SS |
3403 | } |
3404 | } | |
3405 | do_cleanups (old_chain); | |
3406 | } | |
3407 | ||
3408 | /* Print current contents of the tables set by the handle command. | |
3409 | It is possible we should just be printing signals actually used | |
3410 | by the current target (but for things to work right when switching | |
3411 | targets, all signals should be in the signal tables). */ | |
3412 | ||
3413 | static void | |
96baa820 | 3414 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3415 | { |
3416 | enum target_signal oursig; | |
3417 | sig_print_header (); | |
3418 | ||
3419 | if (signum_exp) | |
3420 | { | |
3421 | /* First see if this is a symbol name. */ | |
3422 | oursig = target_signal_from_name (signum_exp); | |
3423 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3424 | { | |
3425 | /* No, try numeric. */ | |
3426 | oursig = | |
bb518678 | 3427 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3428 | } |
3429 | sig_print_info (oursig); | |
3430 | return; | |
3431 | } | |
3432 | ||
3433 | printf_filtered ("\n"); | |
3434 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3435 | for (oursig = TARGET_SIGNAL_FIRST; | |
3436 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3437 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3438 | { | |
3439 | QUIT; | |
3440 | ||
3441 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 3442 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
3443 | sig_print_info (oursig); |
3444 | } | |
3445 | ||
3446 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3447 | } | |
3448 | \f | |
7a292a7a SS |
3449 | struct inferior_status |
3450 | { | |
3451 | enum target_signal stop_signal; | |
3452 | CORE_ADDR stop_pc; | |
3453 | bpstat stop_bpstat; | |
3454 | int stop_step; | |
3455 | int stop_stack_dummy; | |
3456 | int stopped_by_random_signal; | |
3457 | int trap_expected; | |
3458 | CORE_ADDR step_range_start; | |
3459 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 3460 | struct frame_id step_frame_id; |
5fbbeb29 | 3461 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3462 | CORE_ADDR step_resume_break_address; |
3463 | int stop_after_trap; | |
c0236d92 | 3464 | int stop_soon; |
72cec141 | 3465 | struct regcache *stop_registers; |
7a292a7a SS |
3466 | |
3467 | /* These are here because if call_function_by_hand has written some | |
3468 | registers and then decides to call error(), we better not have changed | |
3469 | any registers. */ | |
72cec141 | 3470 | struct regcache *registers; |
7a292a7a | 3471 | |
101dcfbe AC |
3472 | /* A frame unique identifier. */ |
3473 | struct frame_id selected_frame_id; | |
3474 | ||
7a292a7a SS |
3475 | int breakpoint_proceeded; |
3476 | int restore_stack_info; | |
3477 | int proceed_to_finish; | |
3478 | }; | |
3479 | ||
7a292a7a | 3480 | void |
96baa820 JM |
3481 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3482 | LONGEST val) | |
7a292a7a | 3483 | { |
12c266ea | 3484 | int size = DEPRECATED_REGISTER_RAW_SIZE (regno); |
7a292a7a SS |
3485 | void *buf = alloca (size); |
3486 | store_signed_integer (buf, size, val); | |
0818c12a | 3487 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
3488 | } |
3489 | ||
c906108c SS |
3490 | /* Save all of the information associated with the inferior<==>gdb |
3491 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3492 | (defined in inferior.h). */ | |
3493 | ||
7a292a7a | 3494 | struct inferior_status * |
96baa820 | 3495 | save_inferior_status (int restore_stack_info) |
c906108c | 3496 | { |
72cec141 | 3497 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 3498 | |
c906108c SS |
3499 | inf_status->stop_signal = stop_signal; |
3500 | inf_status->stop_pc = stop_pc; | |
3501 | inf_status->stop_step = stop_step; | |
3502 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3503 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3504 | inf_status->trap_expected = trap_expected; | |
3505 | inf_status->step_range_start = step_range_start; | |
3506 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 3507 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
3508 | inf_status->step_over_calls = step_over_calls; |
3509 | inf_status->stop_after_trap = stop_after_trap; | |
c0236d92 | 3510 | inf_status->stop_soon = stop_soon; |
c906108c SS |
3511 | /* Save original bpstat chain here; replace it with copy of chain. |
3512 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3513 | hand them back the original chain when restore_inferior_status is |
3514 | called. */ | |
c906108c SS |
3515 | inf_status->stop_bpstat = stop_bpstat; |
3516 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3517 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3518 | inf_status->restore_stack_info = restore_stack_info; | |
3519 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3520 | |
72cec141 | 3521 | inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers); |
c906108c | 3522 | |
72cec141 | 3523 | inf_status->registers = regcache_dup (current_regcache); |
c906108c | 3524 | |
7a424e99 | 3525 | inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame); |
7a292a7a | 3526 | return inf_status; |
c906108c SS |
3527 | } |
3528 | ||
c906108c | 3529 | static int |
96baa820 | 3530 | restore_selected_frame (void *args) |
c906108c | 3531 | { |
488f131b | 3532 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 3533 | struct frame_info *frame; |
c906108c | 3534 | |
101dcfbe | 3535 | frame = frame_find_by_id (*fid); |
c906108c | 3536 | |
aa0cd9c1 AC |
3537 | /* If inf_status->selected_frame_id is NULL, there was no previously |
3538 | selected frame. */ | |
101dcfbe | 3539 | if (frame == NULL) |
c906108c SS |
3540 | { |
3541 | warning ("Unable to restore previously selected frame.\n"); | |
3542 | return 0; | |
3543 | } | |
3544 | ||
0f7d239c | 3545 | select_frame (frame); |
c906108c SS |
3546 | |
3547 | return (1); | |
3548 | } | |
3549 | ||
3550 | void | |
96baa820 | 3551 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3552 | { |
3553 | stop_signal = inf_status->stop_signal; | |
3554 | stop_pc = inf_status->stop_pc; | |
3555 | stop_step = inf_status->stop_step; | |
3556 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3557 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3558 | trap_expected = inf_status->trap_expected; | |
3559 | step_range_start = inf_status->step_range_start; | |
3560 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 3561 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
3562 | step_over_calls = inf_status->step_over_calls; |
3563 | stop_after_trap = inf_status->stop_after_trap; | |
c0236d92 | 3564 | stop_soon = inf_status->stop_soon; |
c906108c SS |
3565 | bpstat_clear (&stop_bpstat); |
3566 | stop_bpstat = inf_status->stop_bpstat; | |
3567 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3568 | proceed_to_finish = inf_status->proceed_to_finish; | |
3569 | ||
72cec141 AC |
3570 | /* FIXME: Is the restore of stop_registers always needed. */ |
3571 | regcache_xfree (stop_registers); | |
3572 | stop_registers = inf_status->stop_registers; | |
c906108c SS |
3573 | |
3574 | /* The inferior can be gone if the user types "print exit(0)" | |
3575 | (and perhaps other times). */ | |
3576 | if (target_has_execution) | |
72cec141 AC |
3577 | /* NB: The register write goes through to the target. */ |
3578 | regcache_cpy (current_regcache, inf_status->registers); | |
3579 | regcache_xfree (inf_status->registers); | |
c906108c | 3580 | |
c906108c SS |
3581 | /* FIXME: If we are being called after stopping in a function which |
3582 | is called from gdb, we should not be trying to restore the | |
3583 | selected frame; it just prints a spurious error message (The | |
3584 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3585 | clobbers the stack)). In fact, should we be restoring the | |
3586 | inferior status at all in that case? . */ | |
3587 | ||
3588 | if (target_has_stack && inf_status->restore_stack_info) | |
3589 | { | |
c906108c | 3590 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
3591 | walking the stack might encounter a garbage pointer and |
3592 | error() trying to dereference it. */ | |
488f131b JB |
3593 | if (catch_errors |
3594 | (restore_selected_frame, &inf_status->selected_frame_id, | |
3595 | "Unable to restore previously selected frame:\n", | |
3596 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
3597 | /* Error in restoring the selected frame. Select the innermost |
3598 | frame. */ | |
0f7d239c | 3599 | select_frame (get_current_frame ()); |
c906108c SS |
3600 | |
3601 | } | |
c906108c | 3602 | |
72cec141 | 3603 | xfree (inf_status); |
7a292a7a | 3604 | } |
c906108c | 3605 | |
74b7792f AC |
3606 | static void |
3607 | do_restore_inferior_status_cleanup (void *sts) | |
3608 | { | |
3609 | restore_inferior_status (sts); | |
3610 | } | |
3611 | ||
3612 | struct cleanup * | |
3613 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
3614 | { | |
3615 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
3616 | } | |
3617 | ||
c906108c | 3618 | void |
96baa820 | 3619 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3620 | { |
3621 | /* See save_inferior_status for info on stop_bpstat. */ | |
3622 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 AC |
3623 | regcache_xfree (inf_status->registers); |
3624 | regcache_xfree (inf_status->stop_registers); | |
3625 | xfree (inf_status); | |
7a292a7a SS |
3626 | } |
3627 | ||
47932f85 DJ |
3628 | int |
3629 | inferior_has_forked (int pid, int *child_pid) | |
3630 | { | |
3631 | struct target_waitstatus last; | |
3632 | ptid_t last_ptid; | |
3633 | ||
3634 | get_last_target_status (&last_ptid, &last); | |
3635 | ||
3636 | if (last.kind != TARGET_WAITKIND_FORKED) | |
3637 | return 0; | |
3638 | ||
3639 | if (ptid_get_pid (last_ptid) != pid) | |
3640 | return 0; | |
3641 | ||
3642 | *child_pid = last.value.related_pid; | |
3643 | return 1; | |
3644 | } | |
3645 | ||
3646 | int | |
3647 | inferior_has_vforked (int pid, int *child_pid) | |
3648 | { | |
3649 | struct target_waitstatus last; | |
3650 | ptid_t last_ptid; | |
3651 | ||
3652 | get_last_target_status (&last_ptid, &last); | |
3653 | ||
3654 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
3655 | return 0; | |
3656 | ||
3657 | if (ptid_get_pid (last_ptid) != pid) | |
3658 | return 0; | |
3659 | ||
3660 | *child_pid = last.value.related_pid; | |
3661 | return 1; | |
3662 | } | |
3663 | ||
3664 | int | |
3665 | inferior_has_execd (int pid, char **execd_pathname) | |
3666 | { | |
3667 | struct target_waitstatus last; | |
3668 | ptid_t last_ptid; | |
3669 | ||
3670 | get_last_target_status (&last_ptid, &last); | |
3671 | ||
3672 | if (last.kind != TARGET_WAITKIND_EXECD) | |
3673 | return 0; | |
3674 | ||
3675 | if (ptid_get_pid (last_ptid) != pid) | |
3676 | return 0; | |
3677 | ||
3678 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
3679 | return 1; | |
3680 | } | |
3681 | ||
ca6724c1 KB |
3682 | /* Oft used ptids */ |
3683 | ptid_t null_ptid; | |
3684 | ptid_t minus_one_ptid; | |
3685 | ||
3686 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 3687 | |
ca6724c1 KB |
3688 | ptid_t |
3689 | ptid_build (int pid, long lwp, long tid) | |
3690 | { | |
3691 | ptid_t ptid; | |
3692 | ||
3693 | ptid.pid = pid; | |
3694 | ptid.lwp = lwp; | |
3695 | ptid.tid = tid; | |
3696 | return ptid; | |
3697 | } | |
3698 | ||
3699 | /* Create a ptid from just a pid. */ | |
3700 | ||
3701 | ptid_t | |
3702 | pid_to_ptid (int pid) | |
3703 | { | |
3704 | return ptid_build (pid, 0, 0); | |
3705 | } | |
3706 | ||
3707 | /* Fetch the pid (process id) component from a ptid. */ | |
3708 | ||
3709 | int | |
3710 | ptid_get_pid (ptid_t ptid) | |
3711 | { | |
3712 | return ptid.pid; | |
3713 | } | |
3714 | ||
3715 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
3716 | ||
3717 | long | |
3718 | ptid_get_lwp (ptid_t ptid) | |
3719 | { | |
3720 | return ptid.lwp; | |
3721 | } | |
3722 | ||
3723 | /* Fetch the tid (thread id) component from a ptid. */ | |
3724 | ||
3725 | long | |
3726 | ptid_get_tid (ptid_t ptid) | |
3727 | { | |
3728 | return ptid.tid; | |
3729 | } | |
3730 | ||
3731 | /* ptid_equal() is used to test equality of two ptids. */ | |
3732 | ||
3733 | int | |
3734 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
3735 | { | |
3736 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 3737 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
3738 | } |
3739 | ||
3740 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
3741 | to restore the inferior_ptid value saved in a call to | |
3742 | save_inferior_ptid(). */ | |
ce696e05 KB |
3743 | |
3744 | static void | |
3745 | restore_inferior_ptid (void *arg) | |
3746 | { | |
3747 | ptid_t *saved_ptid_ptr = arg; | |
3748 | inferior_ptid = *saved_ptid_ptr; | |
3749 | xfree (arg); | |
3750 | } | |
3751 | ||
3752 | /* Save the value of inferior_ptid so that it may be restored by a | |
3753 | later call to do_cleanups(). Returns the struct cleanup pointer | |
3754 | needed for later doing the cleanup. */ | |
3755 | ||
3756 | struct cleanup * | |
3757 | save_inferior_ptid (void) | |
3758 | { | |
3759 | ptid_t *saved_ptid_ptr; | |
3760 | ||
3761 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
3762 | *saved_ptid_ptr = inferior_ptid; | |
3763 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
3764 | } | |
c5aa993b | 3765 | \f |
488f131b | 3766 | |
7a292a7a | 3767 | static void |
96baa820 | 3768 | build_infrun (void) |
7a292a7a | 3769 | { |
72cec141 | 3770 | stop_registers = regcache_xmalloc (current_gdbarch); |
7a292a7a | 3771 | } |
c906108c | 3772 | |
c906108c | 3773 | void |
96baa820 | 3774 | _initialize_infrun (void) |
c906108c | 3775 | { |
52f0bd74 AC |
3776 | int i; |
3777 | int numsigs; | |
c906108c SS |
3778 | struct cmd_list_element *c; |
3779 | ||
046a4708 AC |
3780 | DEPRECATED_REGISTER_GDBARCH_SWAP (stop_registers); |
3781 | deprecated_register_gdbarch_swap (NULL, 0, build_infrun); | |
0f71a2f6 | 3782 | |
c906108c SS |
3783 | add_info ("signals", signals_info, |
3784 | "What debugger does when program gets various signals.\n\ | |
3785 | Specify a signal as argument to print info on that signal only."); | |
3786 | add_info_alias ("handle", "signals", 0); | |
3787 | ||
3788 | add_com ("handle", class_run, handle_command, | |
3789 | concat ("Specify how to handle a signal.\n\ | |
3790 | Args are signals and actions to apply to those signals.\n\ | |
3791 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3792 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3793 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3794 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3795 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
3796 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
3797 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3798 | Print means print a message if this signal happens.\n\ | |
3799 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3800 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3801 | Pass and Stop may be combined.", NULL)); | |
3802 | if (xdb_commands) | |
3803 | { | |
3804 | add_com ("lz", class_info, signals_info, | |
3805 | "What debugger does when program gets various signals.\n\ | |
3806 | Specify a signal as argument to print info on that signal only."); | |
3807 | add_com ("z", class_run, xdb_handle_command, | |
3808 | concat ("Specify how to handle a signal.\n\ | |
3809 | Args are signals and actions to apply to those signals.\n\ | |
3810 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3811 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3812 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3813 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3814 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\ |
c906108c SS |
3815 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
3816 | nopass), \"Q\" (noprint)\n\ | |
3817 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3818 | Print means print a message if this signal happens.\n\ | |
3819 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3820 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3821 | Pass and Stop may be combined.", NULL)); | |
3822 | } | |
3823 | ||
3824 | if (!dbx_commands) | |
488f131b JB |
3825 | stop_command = |
3826 | 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 |
3827 | This allows you to set a list of commands to be run each time execution\n\ |
3828 | of the program stops.", &cmdlist); | |
3829 | ||
3830 | numsigs = (int) TARGET_SIGNAL_LAST; | |
488f131b | 3831 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
3832 | signal_print = (unsigned char *) |
3833 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
3834 | signal_program = (unsigned char *) | |
3835 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
3836 | for (i = 0; i < numsigs; i++) | |
3837 | { | |
3838 | signal_stop[i] = 1; | |
3839 | signal_print[i] = 1; | |
3840 | signal_program[i] = 1; | |
3841 | } | |
3842 | ||
3843 | /* Signals caused by debugger's own actions | |
3844 | should not be given to the program afterwards. */ | |
3845 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
3846 | signal_program[TARGET_SIGNAL_INT] = 0; | |
3847 | ||
3848 | /* Signals that are not errors should not normally enter the debugger. */ | |
3849 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
3850 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
3851 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
3852 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
3853 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
3854 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
3855 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
3856 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
3857 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
3858 | signal_print[TARGET_SIGNAL_IO] = 0; | |
3859 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
3860 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
3861 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
3862 | signal_print[TARGET_SIGNAL_URG] = 0; | |
3863 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
3864 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
3865 | ||
cd0fc7c3 SS |
3866 | /* These signals are used internally by user-level thread |
3867 | implementations. (See signal(5) on Solaris.) Like the above | |
3868 | signals, a healthy program receives and handles them as part of | |
3869 | its normal operation. */ | |
3870 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
3871 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
3872 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
3873 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
3874 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
3875 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
3876 | ||
c906108c SS |
3877 | #ifdef SOLIB_ADD |
3878 | add_show_from_set | |
3879 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, | |
3880 | (char *) &stop_on_solib_events, | |
3881 | "Set stopping for shared library events.\n\ | |
3882 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
3883 | notifies gdb of shared library events. The most common event of interest\n\ | |
488f131b | 3884 | to the user would be loading/unloading of a new library.\n", &setlist), &showlist); |
c906108c SS |
3885 | #endif |
3886 | ||
3887 | c = add_set_enum_cmd ("follow-fork-mode", | |
3888 | class_run, | |
488f131b | 3889 | follow_fork_mode_kind_names, &follow_fork_mode_string, |
c906108c SS |
3890 | "Set debugger response to a program call of fork \ |
3891 | or vfork.\n\ | |
3892 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
3893 | parent - the original process is debugged after a fork\n\ | |
3894 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 3895 | The unfollowed process will continue to run.\n\ |
488f131b | 3896 | By default, the debugger will follow the parent process.", &setlist); |
c906108c SS |
3897 | add_show_from_set (c, &showlist); |
3898 | ||
488f131b | 3899 | c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */ |
1ed2a135 | 3900 | &scheduler_mode, /* current mode */ |
c906108c SS |
3901 | "Set mode for locking scheduler during execution.\n\ |
3902 | off == no locking (threads may preempt at any time)\n\ | |
3903 | on == full locking (no thread except the current thread may run)\n\ | |
3904 | step == scheduler locked during every single-step operation.\n\ | |
3905 | In this mode, no other thread may run during a step command.\n\ | |
488f131b | 3906 | Other threads may run while stepping over a function call ('next').", &setlist); |
c906108c | 3907 | |
9f60d481 | 3908 | set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */ |
c906108c | 3909 | add_show_from_set (c, &showlist); |
5fbbeb29 CF |
3910 | |
3911 | c = add_set_cmd ("step-mode", class_run, | |
488f131b JB |
3912 | var_boolean, (char *) &step_stop_if_no_debug, |
3913 | "Set mode of the step operation. When set, doing a step over a\n\ | |
5fbbeb29 CF |
3914 | function without debug line information will stop at the first\n\ |
3915 | instruction of that function. Otherwise, the function is skipped and\n\ | |
488f131b | 3916 | the step command stops at a different source line.", &setlist); |
5fbbeb29 | 3917 | add_show_from_set (c, &showlist); |
ca6724c1 KB |
3918 | |
3919 | /* ptid initializations */ | |
3920 | null_ptid = ptid_build (0, 0, 0); | |
3921 | minus_one_ptid = ptid_build (-1, 0, 0); | |
3922 | inferior_ptid = null_ptid; | |
3923 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 3924 | } |