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, | |
7789c6f5 | 5 | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software |
8926118c | 6 | 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" |
c906108c SS |
47 | |
48 | /* Prototypes for local functions */ | |
49 | ||
96baa820 | 50 | static void signals_info (char *, int); |
c906108c | 51 | |
96baa820 | 52 | static void handle_command (char *, int); |
c906108c | 53 | |
96baa820 | 54 | static void sig_print_info (enum target_signal); |
c906108c | 55 | |
96baa820 | 56 | static void sig_print_header (void); |
c906108c | 57 | |
74b7792f | 58 | static void resume_cleanups (void *); |
c906108c | 59 | |
96baa820 | 60 | static int hook_stop_stub (void *); |
c906108c | 61 | |
96baa820 | 62 | static void delete_breakpoint_current_contents (void *); |
c906108c | 63 | |
96baa820 | 64 | static void set_follow_fork_mode_command (char *arg, int from_tty, |
488f131b | 65 | struct cmd_list_element *c); |
7a292a7a | 66 | |
96baa820 JM |
67 | static int restore_selected_frame (void *); |
68 | ||
69 | static void build_infrun (void); | |
70 | ||
4ef3f3be | 71 | static int follow_fork (void); |
96baa820 JM |
72 | |
73 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 74 | struct cmd_list_element *c); |
96baa820 | 75 | |
96baa820 JM |
76 | struct execution_control_state; |
77 | ||
78 | static int currently_stepping (struct execution_control_state *ecs); | |
79 | ||
80 | static void xdb_handle_command (char *args, int from_tty); | |
81 | ||
82 | void _initialize_infrun (void); | |
43ff13b4 | 83 | |
c906108c SS |
84 | int inferior_ignoring_startup_exec_events = 0; |
85 | int inferior_ignoring_leading_exec_events = 0; | |
86 | ||
5fbbeb29 CF |
87 | /* When set, stop the 'step' command if we enter a function which has |
88 | no line number information. The normal behavior is that we step | |
89 | over such function. */ | |
90 | int step_stop_if_no_debug = 0; | |
91 | ||
43ff13b4 | 92 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 93 | |
43ff13b4 JM |
94 | int sync_execution = 0; |
95 | ||
c906108c SS |
96 | /* wait_for_inferior and normal_stop use this to notify the user |
97 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
98 | running in. */ |
99 | ||
39f77062 | 100 | static ptid_t previous_inferior_ptid; |
7a292a7a SS |
101 | |
102 | /* This is true for configurations that may follow through execl() and | |
103 | similar functions. At present this is only true for HP-UX native. */ | |
104 | ||
105 | #ifndef MAY_FOLLOW_EXEC | |
106 | #define MAY_FOLLOW_EXEC (0) | |
c906108c SS |
107 | #endif |
108 | ||
7a292a7a SS |
109 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
110 | ||
d4f3574e SS |
111 | /* If the program uses ELF-style shared libraries, then calls to |
112 | functions in shared libraries go through stubs, which live in a | |
113 | table called the PLT (Procedure Linkage Table). The first time the | |
114 | function is called, the stub sends control to the dynamic linker, | |
115 | which looks up the function's real address, patches the stub so | |
116 | that future calls will go directly to the function, and then passes | |
117 | control to the function. | |
118 | ||
119 | If we are stepping at the source level, we don't want to see any of | |
120 | this --- we just want to skip over the stub and the dynamic linker. | |
121 | The simple approach is to single-step until control leaves the | |
122 | dynamic linker. | |
123 | ||
ca557f44 AC |
124 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
125 | dynamic linker calls functions in the shared C library, so you | |
126 | can't tell from the PC alone whether the dynamic linker is still | |
127 | running. In this case, we use a step-resume breakpoint to get us | |
128 | past the dynamic linker, as if we were using "next" to step over a | |
129 | function call. | |
d4f3574e SS |
130 | |
131 | IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic | |
132 | linker code or not. Normally, this means we single-step. However, | |
133 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
134 | address where we can place a step-resume breakpoint to get past the | |
135 | linker's symbol resolution function. | |
136 | ||
137 | IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a | |
138 | pretty portable way, by comparing the PC against the address ranges | |
139 | of the dynamic linker's sections. | |
140 | ||
141 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
142 | it depends on internal details of the dynamic linker. It's usually | |
143 | not too hard to figure out where to put a breakpoint, but it | |
144 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
145 | sanity checking. If it can't figure things out, returning zero and | |
146 | getting the (possibly confusing) stepping behavior is better than | |
147 | signalling an error, which will obscure the change in the | |
148 | inferior's state. */ | |
c906108c SS |
149 | |
150 | #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
151 | #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 | |
152 | #endif | |
153 | ||
d4f3574e SS |
154 | #ifndef SKIP_SOLIB_RESOLVER |
155 | #define SKIP_SOLIB_RESOLVER(pc) 0 | |
156 | #endif | |
157 | ||
c906108c SS |
158 | /* This function returns TRUE if pc is the address of an instruction |
159 | that lies within the dynamic linker (such as the event hook, or the | |
160 | dld itself). | |
161 | ||
162 | This function must be used only when a dynamic linker event has | |
163 | been caught, and the inferior is being stepped out of the hook, or | |
164 | undefined results are guaranteed. */ | |
165 | ||
166 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
167 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
168 | #endif | |
169 | ||
170 | /* On MIPS16, a function that returns a floating point value may call | |
171 | a library helper function to copy the return value to a floating point | |
172 | register. The IGNORE_HELPER_CALL macro returns non-zero if we | |
173 | should ignore (i.e. step over) this function call. */ | |
174 | #ifndef IGNORE_HELPER_CALL | |
175 | #define IGNORE_HELPER_CALL(pc) 0 | |
176 | #endif | |
177 | ||
178 | /* On some systems, the PC may be left pointing at an instruction that won't | |
179 | actually be executed. This is usually indicated by a bit in the PSW. If | |
180 | we find ourselves in such a state, then we step the target beyond the | |
181 | nullified instruction before returning control to the user so as to avoid | |
182 | confusion. */ | |
183 | ||
184 | #ifndef INSTRUCTION_NULLIFIED | |
185 | #define INSTRUCTION_NULLIFIED 0 | |
186 | #endif | |
187 | ||
c2c6d25f JM |
188 | /* We can't step off a permanent breakpoint in the ordinary way, because we |
189 | can't remove it. Instead, we have to advance the PC to the next | |
190 | instruction. This macro should expand to a pointer to a function that | |
191 | does that, or zero if we have no such function. If we don't have a | |
192 | definition for it, we have to report an error. */ | |
488f131b | 193 | #ifndef SKIP_PERMANENT_BREAKPOINT |
c2c6d25f JM |
194 | #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint) |
195 | static void | |
c2d11a7d | 196 | default_skip_permanent_breakpoint (void) |
c2c6d25f | 197 | { |
255e7dbf | 198 | error ("\ |
c2c6d25f JM |
199 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ |
200 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
255e7dbf | 201 | a command like `return' or `jump' to continue execution."); |
c2c6d25f JM |
202 | } |
203 | #endif | |
488f131b | 204 | |
c2c6d25f | 205 | |
7a292a7a SS |
206 | /* Convert the #defines into values. This is temporary until wfi control |
207 | flow is completely sorted out. */ | |
208 | ||
209 | #ifndef HAVE_STEPPABLE_WATCHPOINT | |
210 | #define HAVE_STEPPABLE_WATCHPOINT 0 | |
211 | #else | |
212 | #undef HAVE_STEPPABLE_WATCHPOINT | |
213 | #define HAVE_STEPPABLE_WATCHPOINT 1 | |
214 | #endif | |
215 | ||
692590c1 MS |
216 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
217 | #define CANNOT_STEP_HW_WATCHPOINTS 0 | |
218 | #else | |
219 | #undef CANNOT_STEP_HW_WATCHPOINTS | |
220 | #define CANNOT_STEP_HW_WATCHPOINTS 1 | |
221 | #endif | |
222 | ||
c906108c SS |
223 | /* Tables of how to react to signals; the user sets them. */ |
224 | ||
225 | static unsigned char *signal_stop; | |
226 | static unsigned char *signal_print; | |
227 | static unsigned char *signal_program; | |
228 | ||
229 | #define SET_SIGS(nsigs,sigs,flags) \ | |
230 | do { \ | |
231 | int signum = (nsigs); \ | |
232 | while (signum-- > 0) \ | |
233 | if ((sigs)[signum]) \ | |
234 | (flags)[signum] = 1; \ | |
235 | } while (0) | |
236 | ||
237 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
238 | do { \ | |
239 | int signum = (nsigs); \ | |
240 | while (signum-- > 0) \ | |
241 | if ((sigs)[signum]) \ | |
242 | (flags)[signum] = 0; \ | |
243 | } while (0) | |
244 | ||
39f77062 KB |
245 | /* Value to pass to target_resume() to cause all threads to resume */ |
246 | ||
247 | #define RESUME_ALL (pid_to_ptid (-1)) | |
c906108c SS |
248 | |
249 | /* Command list pointer for the "stop" placeholder. */ | |
250 | ||
251 | static struct cmd_list_element *stop_command; | |
252 | ||
253 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
254 | ||
255 | static int breakpoints_inserted; | |
256 | ||
257 | /* Function inferior was in as of last step command. */ | |
258 | ||
259 | static struct symbol *step_start_function; | |
260 | ||
261 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
262 | ||
263 | static int trap_expected; | |
264 | ||
265 | #ifdef SOLIB_ADD | |
266 | /* Nonzero if we want to give control to the user when we're notified | |
267 | of shared library events by the dynamic linker. */ | |
268 | static int stop_on_solib_events; | |
269 | #endif | |
270 | ||
271 | #ifdef HP_OS_BUG | |
272 | /* Nonzero if the next time we try to continue the inferior, it will | |
273 | step one instruction and generate a spurious trace trap. | |
274 | This is used to compensate for a bug in HP-UX. */ | |
275 | ||
276 | static int trap_expected_after_continue; | |
277 | #endif | |
278 | ||
279 | /* Nonzero means expecting a trace trap | |
280 | and should stop the inferior and return silently when it happens. */ | |
281 | ||
282 | int stop_after_trap; | |
283 | ||
284 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
285 | It is used after attach, due to attaching to a process; | |
286 | when running in the shell before the child program has been exec'd; | |
287 | and when running some kinds of remote stuff (FIXME?). */ | |
288 | ||
c0236d92 | 289 | enum stop_kind stop_soon; |
c906108c SS |
290 | |
291 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
292 | situation when stop_registers should be saved. */ | |
293 | ||
294 | int proceed_to_finish; | |
295 | ||
296 | /* Save register contents here when about to pop a stack dummy frame, | |
297 | if-and-only-if proceed_to_finish is set. | |
298 | Thus this contains the return value from the called function (assuming | |
299 | values are returned in a register). */ | |
300 | ||
72cec141 | 301 | struct regcache *stop_registers; |
c906108c SS |
302 | |
303 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
304 | ||
305 | static int breakpoints_failed; | |
306 | ||
307 | /* Nonzero after stop if current stack frame should be printed. */ | |
308 | ||
309 | static int stop_print_frame; | |
310 | ||
311 | static struct breakpoint *step_resume_breakpoint = NULL; | |
312 | static struct breakpoint *through_sigtramp_breakpoint = NULL; | |
313 | ||
314 | /* On some platforms (e.g., HP-UX), hardware watchpoints have bad | |
315 | interactions with an inferior that is running a kernel function | |
316 | (aka, a system call or "syscall"). wait_for_inferior therefore | |
317 | may have a need to know when the inferior is in a syscall. This | |
318 | is a count of the number of inferior threads which are known to | |
319 | currently be running in a syscall. */ | |
320 | static int number_of_threads_in_syscalls; | |
321 | ||
e02bc4cc DS |
322 | /* This is a cached copy of the pid/waitstatus of the last event |
323 | returned by target_wait()/target_wait_hook(). This information is | |
324 | returned by get_last_target_status(). */ | |
39f77062 | 325 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
326 | static struct target_waitstatus target_last_waitstatus; |
327 | ||
c906108c SS |
328 | /* This is used to remember when a fork, vfork or exec event |
329 | was caught by a catchpoint, and thus the event is to be | |
330 | followed at the next resume of the inferior, and not | |
331 | immediately. */ | |
332 | static struct | |
488f131b JB |
333 | { |
334 | enum target_waitkind kind; | |
335 | struct | |
c906108c | 336 | { |
488f131b | 337 | int parent_pid; |
488f131b | 338 | int child_pid; |
c906108c | 339 | } |
488f131b JB |
340 | fork_event; |
341 | char *execd_pathname; | |
342 | } | |
c906108c SS |
343 | pending_follow; |
344 | ||
53904c9e | 345 | static const char follow_fork_mode_ask[] = "ask"; |
53904c9e AC |
346 | static const char follow_fork_mode_child[] = "child"; |
347 | static const char follow_fork_mode_parent[] = "parent"; | |
348 | ||
488f131b | 349 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e | 350 | follow_fork_mode_ask, |
53904c9e AC |
351 | follow_fork_mode_child, |
352 | follow_fork_mode_parent, | |
353 | NULL | |
ef346e04 | 354 | }; |
c906108c | 355 | |
53904c9e | 356 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
c906108c SS |
357 | \f |
358 | ||
6604731b | 359 | static int |
4ef3f3be | 360 | follow_fork (void) |
c906108c | 361 | { |
53904c9e | 362 | const char *follow_mode = follow_fork_mode_string; |
6604731b | 363 | int follow_child = (follow_mode == follow_fork_mode_child); |
c906108c SS |
364 | |
365 | /* Or, did the user not know, and want us to ask? */ | |
e28d556f | 366 | if (follow_fork_mode_string == follow_fork_mode_ask) |
c906108c | 367 | { |
8e65ff28 AC |
368 | internal_error (__FILE__, __LINE__, |
369 | "follow_inferior_fork: \"ask\" mode not implemented"); | |
53904c9e | 370 | /* follow_mode = follow_fork_mode_...; */ |
c906108c SS |
371 | } |
372 | ||
6604731b | 373 | return target_follow_fork (follow_child); |
c906108c SS |
374 | } |
375 | ||
6604731b DJ |
376 | void |
377 | follow_inferior_reset_breakpoints (void) | |
c906108c | 378 | { |
6604731b DJ |
379 | /* Was there a step_resume breakpoint? (There was if the user |
380 | did a "next" at the fork() call.) If so, explicitly reset its | |
381 | thread number. | |
382 | ||
383 | step_resumes are a form of bp that are made to be per-thread. | |
384 | Since we created the step_resume bp when the parent process | |
385 | was being debugged, and now are switching to the child process, | |
386 | from the breakpoint package's viewpoint, that's a switch of | |
387 | "threads". We must update the bp's notion of which thread | |
388 | it is for, or it'll be ignored when it triggers. */ | |
389 | ||
390 | if (step_resume_breakpoint) | |
391 | breakpoint_re_set_thread (step_resume_breakpoint); | |
392 | ||
393 | /* Reinsert all breakpoints in the child. The user may have set | |
394 | breakpoints after catching the fork, in which case those | |
395 | were never set in the child, but only in the parent. This makes | |
396 | sure the inserted breakpoints match the breakpoint list. */ | |
397 | ||
398 | breakpoint_re_set (); | |
399 | insert_breakpoints (); | |
c906108c | 400 | } |
c906108c | 401 | |
1adeb98a FN |
402 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
403 | ||
c906108c | 404 | static void |
96baa820 | 405 | follow_exec (int pid, char *execd_pathname) |
c906108c | 406 | { |
c906108c | 407 | int saved_pid = pid; |
7a292a7a SS |
408 | struct target_ops *tgt; |
409 | ||
410 | if (!may_follow_exec) | |
411 | return; | |
c906108c | 412 | |
c906108c SS |
413 | /* This is an exec event that we actually wish to pay attention to. |
414 | Refresh our symbol table to the newly exec'd program, remove any | |
415 | momentary bp's, etc. | |
416 | ||
417 | If there are breakpoints, they aren't really inserted now, | |
418 | since the exec() transformed our inferior into a fresh set | |
419 | of instructions. | |
420 | ||
421 | We want to preserve symbolic breakpoints on the list, since | |
422 | we have hopes that they can be reset after the new a.out's | |
423 | symbol table is read. | |
424 | ||
425 | However, any "raw" breakpoints must be removed from the list | |
426 | (e.g., the solib bp's), since their address is probably invalid | |
427 | now. | |
428 | ||
429 | And, we DON'T want to call delete_breakpoints() here, since | |
430 | that may write the bp's "shadow contents" (the instruction | |
431 | value that was overwritten witha TRAP instruction). Since | |
432 | we now have a new a.out, those shadow contents aren't valid. */ | |
433 | update_breakpoints_after_exec (); | |
434 | ||
435 | /* If there was one, it's gone now. We cannot truly step-to-next | |
436 | statement through an exec(). */ | |
437 | step_resume_breakpoint = NULL; | |
438 | step_range_start = 0; | |
439 | step_range_end = 0; | |
440 | ||
441 | /* If there was one, it's gone now. */ | |
442 | through_sigtramp_breakpoint = NULL; | |
443 | ||
444 | /* What is this a.out's name? */ | |
445 | printf_unfiltered ("Executing new program: %s\n", execd_pathname); | |
446 | ||
447 | /* We've followed the inferior through an exec. Therefore, the | |
448 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
449 | |
450 | /* First collect the run target in effect. */ | |
451 | tgt = find_run_target (); | |
452 | /* If we can't find one, things are in a very strange state... */ | |
453 | if (tgt == NULL) | |
454 | error ("Could find run target to save before following exec"); | |
455 | ||
c906108c SS |
456 | gdb_flush (gdb_stdout); |
457 | target_mourn_inferior (); | |
39f77062 | 458 | inferior_ptid = pid_to_ptid (saved_pid); |
488f131b | 459 | /* Because mourn_inferior resets inferior_ptid. */ |
7a292a7a | 460 | push_target (tgt); |
c906108c SS |
461 | |
462 | /* That a.out is now the one to use. */ | |
463 | exec_file_attach (execd_pathname, 0); | |
464 | ||
465 | /* And also is where symbols can be found. */ | |
1adeb98a | 466 | symbol_file_add_main (execd_pathname, 0); |
c906108c SS |
467 | |
468 | /* Reset the shared library package. This ensures that we get | |
469 | a shlib event when the child reaches "_start", at which point | |
470 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 471 | #if defined(SOLIB_RESTART) |
c906108c | 472 | SOLIB_RESTART (); |
7a292a7a SS |
473 | #endif |
474 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
39f77062 | 475 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
7a292a7a | 476 | #endif |
c906108c SS |
477 | |
478 | /* Reinsert all breakpoints. (Those which were symbolic have | |
479 | been reset to the proper address in the new a.out, thanks | |
480 | to symbol_file_command...) */ | |
481 | insert_breakpoints (); | |
482 | ||
483 | /* The next resume of this inferior should bring it to the shlib | |
484 | startup breakpoints. (If the user had also set bp's on | |
485 | "main" from the old (parent) process, then they'll auto- | |
486 | matically get reset there in the new process.) */ | |
c906108c SS |
487 | } |
488 | ||
489 | /* Non-zero if we just simulating a single-step. This is needed | |
490 | because we cannot remove the breakpoints in the inferior process | |
491 | until after the `wait' in `wait_for_inferior'. */ | |
492 | static int singlestep_breakpoints_inserted_p = 0; | |
493 | \f | |
494 | ||
495 | /* Things to clean up if we QUIT out of resume (). */ | |
496 | /* ARGSUSED */ | |
497 | static void | |
74b7792f | 498 | resume_cleanups (void *ignore) |
c906108c SS |
499 | { |
500 | normal_stop (); | |
501 | } | |
502 | ||
53904c9e AC |
503 | static const char schedlock_off[] = "off"; |
504 | static const char schedlock_on[] = "on"; | |
505 | static const char schedlock_step[] = "step"; | |
506 | static const char *scheduler_mode = schedlock_off; | |
488f131b | 507 | static const char *scheduler_enums[] = { |
ef346e04 AC |
508 | schedlock_off, |
509 | schedlock_on, | |
510 | schedlock_step, | |
511 | NULL | |
512 | }; | |
c906108c SS |
513 | |
514 | static void | |
96baa820 | 515 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 516 | { |
1868c04e AC |
517 | /* NOTE: cagney/2002-03-17: The add_show_from_set() function clones |
518 | the set command passed as a parameter. The clone operation will | |
519 | include (BUG?) any ``set'' command callback, if present. | |
520 | Commands like ``info set'' call all the ``show'' command | |
521 | callbacks. Unfortunatly, for ``show'' commands cloned from | |
522 | ``set'', this includes callbacks belonging to ``set'' commands. | |
523 | Making this worse, this only occures if add_show_from_set() is | |
524 | called after add_cmd_sfunc() (BUG?). */ | |
525 | if (cmd_type (c) == set_cmd) | |
c906108c SS |
526 | if (!target_can_lock_scheduler) |
527 | { | |
528 | scheduler_mode = schedlock_off; | |
488f131b | 529 | error ("Target '%s' cannot support this command.", target_shortname); |
c906108c SS |
530 | } |
531 | } | |
532 | ||
533 | ||
534 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
535 | wants to interrupt some lengthy single-stepping operation | |
536 | (for child processes, the SIGINT goes to the inferior, and so | |
537 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
538 | other targets, that's not true). | |
539 | ||
540 | STEP nonzero if we should step (zero to continue instead). | |
541 | SIG is the signal to give the inferior (zero for none). */ | |
542 | void | |
96baa820 | 543 | resume (int step, enum target_signal sig) |
c906108c SS |
544 | { |
545 | int should_resume = 1; | |
74b7792f | 546 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
c906108c SS |
547 | QUIT; |
548 | ||
ef5cf84e MS |
549 | /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */ |
550 | ||
c906108c | 551 | |
692590c1 MS |
552 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
553 | over an instruction that causes a page fault without triggering | |
554 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
555 | stop, because the hardware watchpoint is not triggered, but it forgets | |
556 | the step request and continues the program normally. | |
557 | Work around the problem by removing hardware watchpoints if a step is | |
558 | requested, GDB will check for a hardware watchpoint trigger after the | |
559 | step anyway. */ | |
560 | if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) | |
561 | remove_hw_watchpoints (); | |
488f131b | 562 | |
692590c1 | 563 | |
c2c6d25f JM |
564 | /* Normally, by the time we reach `resume', the breakpoints are either |
565 | removed or inserted, as appropriate. The exception is if we're sitting | |
566 | at a permanent breakpoint; we need to step over it, but permanent | |
567 | breakpoints can't be removed. So we have to test for it here. */ | |
568 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
569 | SKIP_PERMANENT_BREAKPOINT (); | |
570 | ||
b0ed3589 | 571 | if (SOFTWARE_SINGLE_STEP_P () && step) |
c906108c SS |
572 | { |
573 | /* Do it the hard way, w/temp breakpoints */ | |
c5aa993b | 574 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
c906108c SS |
575 | /* ...and don't ask hardware to do it. */ |
576 | step = 0; | |
577 | /* and do not pull these breakpoints until after a `wait' in | |
578 | `wait_for_inferior' */ | |
579 | singlestep_breakpoints_inserted_p = 1; | |
580 | } | |
581 | ||
582 | /* Handle any optimized stores to the inferior NOW... */ | |
583 | #ifdef DO_DEFERRED_STORES | |
584 | DO_DEFERRED_STORES; | |
585 | #endif | |
586 | ||
c906108c | 587 | /* If there were any forks/vforks/execs that were caught and are |
6604731b | 588 | now to be followed, then do so. */ |
c906108c SS |
589 | switch (pending_follow.kind) |
590 | { | |
6604731b DJ |
591 | case TARGET_WAITKIND_FORKED: |
592 | case TARGET_WAITKIND_VFORKED: | |
c906108c | 593 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
6604731b DJ |
594 | if (follow_fork ()) |
595 | should_resume = 0; | |
c906108c SS |
596 | break; |
597 | ||
6604731b | 598 | case TARGET_WAITKIND_EXECD: |
c906108c | 599 | /* follow_exec is called as soon as the exec event is seen. */ |
6604731b | 600 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
c906108c SS |
601 | break; |
602 | ||
603 | default: | |
604 | break; | |
605 | } | |
c906108c SS |
606 | |
607 | /* Install inferior's terminal modes. */ | |
608 | target_terminal_inferior (); | |
609 | ||
610 | if (should_resume) | |
611 | { | |
39f77062 | 612 | ptid_t resume_ptid; |
dfcd3bfb | 613 | |
488f131b | 614 | resume_ptid = RESUME_ALL; /* Default */ |
ef5cf84e MS |
615 | |
616 | if ((step || singlestep_breakpoints_inserted_p) && | |
617 | !breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
c906108c | 618 | { |
ef5cf84e MS |
619 | /* Stepping past a breakpoint without inserting breakpoints. |
620 | Make sure only the current thread gets to step, so that | |
621 | other threads don't sneak past breakpoints while they are | |
622 | not inserted. */ | |
c906108c | 623 | |
ef5cf84e | 624 | resume_ptid = inferior_ptid; |
c906108c | 625 | } |
ef5cf84e MS |
626 | |
627 | if ((scheduler_mode == schedlock_on) || | |
488f131b | 628 | (scheduler_mode == schedlock_step && |
ef5cf84e | 629 | (step || singlestep_breakpoints_inserted_p))) |
c906108c | 630 | { |
ef5cf84e | 631 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 632 | resume_ptid = inferior_ptid; |
c906108c | 633 | } |
ef5cf84e | 634 | |
c4ed33b9 AC |
635 | if (CANNOT_STEP_BREAKPOINT) |
636 | { | |
637 | /* Most targets can step a breakpoint instruction, thus | |
638 | executing it normally. But if this one cannot, just | |
639 | continue and we will hit it anyway. */ | |
640 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
641 | step = 0; | |
642 | } | |
39f77062 | 643 | target_resume (resume_ptid, step, sig); |
c906108c SS |
644 | } |
645 | ||
646 | discard_cleanups (old_cleanups); | |
647 | } | |
648 | \f | |
649 | ||
650 | /* Clear out all variables saying what to do when inferior is continued. | |
651 | First do this, then set the ones you want, then call `proceed'. */ | |
652 | ||
653 | void | |
96baa820 | 654 | clear_proceed_status (void) |
c906108c SS |
655 | { |
656 | trap_expected = 0; | |
657 | step_range_start = 0; | |
658 | step_range_end = 0; | |
aa0cd9c1 | 659 | step_frame_id = null_frame_id; |
5fbbeb29 | 660 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c | 661 | stop_after_trap = 0; |
c0236d92 | 662 | stop_soon = NO_STOP_QUIETLY; |
c906108c SS |
663 | proceed_to_finish = 0; |
664 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
665 | ||
666 | /* Discard any remaining commands or status from previous stop. */ | |
667 | bpstat_clear (&stop_bpstat); | |
668 | } | |
669 | ||
670 | /* Basic routine for continuing the program in various fashions. | |
671 | ||
672 | ADDR is the address to resume at, or -1 for resume where stopped. | |
673 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 674 | or -1 for act according to how it stopped. |
c906108c | 675 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
676 | -1 means return after that and print nothing. |
677 | You should probably set various step_... variables | |
678 | before calling here, if you are stepping. | |
c906108c SS |
679 | |
680 | You should call clear_proceed_status before calling proceed. */ | |
681 | ||
682 | void | |
96baa820 | 683 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
684 | { |
685 | int oneproc = 0; | |
686 | ||
687 | if (step > 0) | |
688 | step_start_function = find_pc_function (read_pc ()); | |
689 | if (step < 0) | |
690 | stop_after_trap = 1; | |
691 | ||
2acceee2 | 692 | if (addr == (CORE_ADDR) -1) |
c906108c SS |
693 | { |
694 | /* If there is a breakpoint at the address we will resume at, | |
c5aa993b JM |
695 | step one instruction before inserting breakpoints |
696 | so that we do not stop right away (and report a second | |
c906108c SS |
697 | hit at this breakpoint). */ |
698 | ||
699 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) | |
700 | oneproc = 1; | |
701 | ||
702 | #ifndef STEP_SKIPS_DELAY | |
703 | #define STEP_SKIPS_DELAY(pc) (0) | |
704 | #define STEP_SKIPS_DELAY_P (0) | |
705 | #endif | |
706 | /* Check breakpoint_here_p first, because breakpoint_here_p is fast | |
c5aa993b JM |
707 | (it just checks internal GDB data structures) and STEP_SKIPS_DELAY |
708 | is slow (it needs to read memory from the target). */ | |
c906108c SS |
709 | if (STEP_SKIPS_DELAY_P |
710 | && breakpoint_here_p (read_pc () + 4) | |
711 | && STEP_SKIPS_DELAY (read_pc ())) | |
712 | oneproc = 1; | |
713 | } | |
714 | else | |
715 | { | |
716 | write_pc (addr); | |
c906108c SS |
717 | } |
718 | ||
719 | #ifdef PREPARE_TO_PROCEED | |
720 | /* In a multi-threaded task we may select another thread | |
721 | and then continue or step. | |
722 | ||
723 | But if the old thread was stopped at a breakpoint, it | |
724 | will immediately cause another breakpoint stop without | |
725 | any execution (i.e. it will report a breakpoint hit | |
726 | incorrectly). So we must step over it first. | |
727 | ||
728 | PREPARE_TO_PROCEED checks the current thread against the thread | |
729 | that reported the most recent event. If a step-over is required | |
730 | it returns TRUE and sets the current thread to the old thread. */ | |
9e086581 | 731 | if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ())) |
c906108c SS |
732 | { |
733 | oneproc = 1; | |
c906108c SS |
734 | } |
735 | ||
736 | #endif /* PREPARE_TO_PROCEED */ | |
737 | ||
738 | #ifdef HP_OS_BUG | |
739 | if (trap_expected_after_continue) | |
740 | { | |
741 | /* If (step == 0), a trap will be automatically generated after | |
c5aa993b JM |
742 | the first instruction is executed. Force step one |
743 | instruction to clear this condition. This should not occur | |
744 | if step is nonzero, but it is harmless in that case. */ | |
c906108c SS |
745 | oneproc = 1; |
746 | trap_expected_after_continue = 0; | |
747 | } | |
748 | #endif /* HP_OS_BUG */ | |
749 | ||
750 | if (oneproc) | |
751 | /* We will get a trace trap after one instruction. | |
752 | Continue it automatically and insert breakpoints then. */ | |
753 | trap_expected = 1; | |
754 | else | |
755 | { | |
81d0cc19 GS |
756 | insert_breakpoints (); |
757 | /* If we get here there was no call to error() in | |
758 | insert breakpoints -- so they were inserted. */ | |
c906108c SS |
759 | breakpoints_inserted = 1; |
760 | } | |
761 | ||
762 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
763 | stop_signal = siggnal; | |
764 | /* If this signal should not be seen by program, | |
765 | give it zero. Used for debugging signals. */ | |
766 | else if (!signal_program[stop_signal]) | |
767 | stop_signal = TARGET_SIGNAL_0; | |
768 | ||
769 | annotate_starting (); | |
770 | ||
771 | /* Make sure that output from GDB appears before output from the | |
772 | inferior. */ | |
773 | gdb_flush (gdb_stdout); | |
774 | ||
775 | /* Resume inferior. */ | |
776 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
777 | ||
778 | /* Wait for it to stop (if not standalone) | |
779 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
780 | /* Do this only if we are not using the event loop, or if the target |
781 | does not support asynchronous execution. */ | |
6426a772 | 782 | if (!event_loop_p || !target_can_async_p ()) |
43ff13b4 JM |
783 | { |
784 | wait_for_inferior (); | |
785 | normal_stop (); | |
786 | } | |
c906108c SS |
787 | } |
788 | ||
0ce3d317 AC |
789 | /* Record the pc of the program the last time it stopped. This is |
790 | just used internally by wait_for_inferior, but need to be preserved | |
791 | over calls to it and cleared when the inferior is started. */ | |
c906108c | 792 | static CORE_ADDR prev_pc; |
c906108c SS |
793 | \f |
794 | ||
795 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 796 | |
c906108c | 797 | void |
96baa820 | 798 | start_remote (void) |
c906108c SS |
799 | { |
800 | init_thread_list (); | |
801 | init_wait_for_inferior (); | |
c0236d92 | 802 | stop_soon = STOP_QUIETLY; |
c906108c | 803 | trap_expected = 0; |
43ff13b4 | 804 | |
6426a772 JM |
805 | /* Always go on waiting for the target, regardless of the mode. */ |
806 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 807 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
808 | nothing is returned (instead of just blocking). Because of this, |
809 | targets expecting an immediate response need to, internally, set | |
810 | things up so that the target_wait() is forced to eventually | |
811 | timeout. */ | |
812 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
813 | differentiate to its caller what the state of the target is after | |
814 | the initial open has been performed. Here we're assuming that | |
815 | the target has stopped. It should be possible to eventually have | |
816 | target_open() return to the caller an indication that the target | |
817 | is currently running and GDB state should be set to the same as | |
818 | for an async run. */ | |
819 | wait_for_inferior (); | |
820 | normal_stop (); | |
c906108c SS |
821 | } |
822 | ||
823 | /* Initialize static vars when a new inferior begins. */ | |
824 | ||
825 | void | |
96baa820 | 826 | init_wait_for_inferior (void) |
c906108c SS |
827 | { |
828 | /* These are meaningless until the first time through wait_for_inferior. */ | |
829 | prev_pc = 0; | |
c906108c SS |
830 | |
831 | #ifdef HP_OS_BUG | |
832 | trap_expected_after_continue = 0; | |
833 | #endif | |
834 | breakpoints_inserted = 0; | |
835 | breakpoint_init_inferior (inf_starting); | |
836 | ||
837 | /* Don't confuse first call to proceed(). */ | |
838 | stop_signal = TARGET_SIGNAL_0; | |
839 | ||
840 | /* The first resume is not following a fork/vfork/exec. */ | |
841 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
c906108c SS |
842 | |
843 | /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ | |
844 | number_of_threads_in_syscalls = 0; | |
845 | ||
846 | clear_proceed_status (); | |
847 | } | |
848 | ||
849 | static void | |
96baa820 | 850 | delete_breakpoint_current_contents (void *arg) |
c906108c SS |
851 | { |
852 | struct breakpoint **breakpointp = (struct breakpoint **) arg; | |
853 | if (*breakpointp != NULL) | |
854 | { | |
855 | delete_breakpoint (*breakpointp); | |
856 | *breakpointp = NULL; | |
857 | } | |
858 | } | |
859 | \f | |
b83266a0 SS |
860 | /* This enum encodes possible reasons for doing a target_wait, so that |
861 | wfi can call target_wait in one place. (Ultimately the call will be | |
862 | moved out of the infinite loop entirely.) */ | |
863 | ||
c5aa993b JM |
864 | enum infwait_states |
865 | { | |
cd0fc7c3 SS |
866 | infwait_normal_state, |
867 | infwait_thread_hop_state, | |
868 | infwait_nullified_state, | |
869 | infwait_nonstep_watch_state | |
b83266a0 SS |
870 | }; |
871 | ||
11cf8741 JM |
872 | /* Why did the inferior stop? Used to print the appropriate messages |
873 | to the interface from within handle_inferior_event(). */ | |
874 | enum inferior_stop_reason | |
875 | { | |
876 | /* We don't know why. */ | |
877 | STOP_UNKNOWN, | |
878 | /* Step, next, nexti, stepi finished. */ | |
879 | END_STEPPING_RANGE, | |
880 | /* Found breakpoint. */ | |
881 | BREAKPOINT_HIT, | |
882 | /* Inferior terminated by signal. */ | |
883 | SIGNAL_EXITED, | |
884 | /* Inferior exited. */ | |
885 | EXITED, | |
886 | /* Inferior received signal, and user asked to be notified. */ | |
887 | SIGNAL_RECEIVED | |
888 | }; | |
889 | ||
cd0fc7c3 SS |
890 | /* This structure contains what used to be local variables in |
891 | wait_for_inferior. Probably many of them can return to being | |
892 | locals in handle_inferior_event. */ | |
893 | ||
c5aa993b | 894 | struct execution_control_state |
488f131b JB |
895 | { |
896 | struct target_waitstatus ws; | |
897 | struct target_waitstatus *wp; | |
898 | int another_trap; | |
899 | int random_signal; | |
900 | CORE_ADDR stop_func_start; | |
901 | CORE_ADDR stop_func_end; | |
902 | char *stop_func_name; | |
903 | struct symtab_and_line sal; | |
904 | int remove_breakpoints_on_following_step; | |
905 | int current_line; | |
906 | struct symtab *current_symtab; | |
907 | int handling_longjmp; /* FIXME */ | |
908 | ptid_t ptid; | |
909 | ptid_t saved_inferior_ptid; | |
910 | int update_step_sp; | |
911 | int stepping_through_solib_after_catch; | |
912 | bpstat stepping_through_solib_catchpoints; | |
913 | int enable_hw_watchpoints_after_wait; | |
914 | int stepping_through_sigtramp; | |
915 | int new_thread_event; | |
916 | struct target_waitstatus tmpstatus; | |
917 | enum infwait_states infwait_state; | |
918 | ptid_t waiton_ptid; | |
919 | int wait_some_more; | |
920 | }; | |
921 | ||
922 | void init_execution_control_state (struct execution_control_state *ecs); | |
923 | ||
924 | void handle_inferior_event (struct execution_control_state *ecs); | |
cd0fc7c3 | 925 | |
104c1213 | 926 | static void check_sigtramp2 (struct execution_control_state *ecs); |
c2c6d25f | 927 | static void step_into_function (struct execution_control_state *ecs); |
d4f3574e | 928 | static void step_over_function (struct execution_control_state *ecs); |
104c1213 JM |
929 | static void stop_stepping (struct execution_control_state *ecs); |
930 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 931 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
932 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
933 | int stop_info); | |
104c1213 | 934 | |
cd0fc7c3 SS |
935 | /* Wait for control to return from inferior to debugger. |
936 | If inferior gets a signal, we may decide to start it up again | |
937 | instead of returning. That is why there is a loop in this function. | |
938 | When this function actually returns it means the inferior | |
939 | should be left stopped and GDB should read more commands. */ | |
940 | ||
941 | void | |
96baa820 | 942 | wait_for_inferior (void) |
cd0fc7c3 SS |
943 | { |
944 | struct cleanup *old_cleanups; | |
945 | struct execution_control_state ecss; | |
946 | struct execution_control_state *ecs; | |
c906108c | 947 | |
8601f500 | 948 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c SS |
949 | &step_resume_breakpoint); |
950 | make_cleanup (delete_breakpoint_current_contents, | |
951 | &through_sigtramp_breakpoint); | |
cd0fc7c3 SS |
952 | |
953 | /* wfi still stays in a loop, so it's OK just to take the address of | |
954 | a local to get the ecs pointer. */ | |
955 | ecs = &ecss; | |
956 | ||
957 | /* Fill in with reasonable starting values. */ | |
958 | init_execution_control_state (ecs); | |
959 | ||
c906108c | 960 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 961 | previous_inferior_ptid = inferior_ptid; |
c906108c | 962 | |
cd0fc7c3 SS |
963 | overlay_cache_invalid = 1; |
964 | ||
965 | /* We have to invalidate the registers BEFORE calling target_wait | |
966 | because they can be loaded from the target while in target_wait. | |
967 | This makes remote debugging a bit more efficient for those | |
968 | targets that provide critical registers as part of their normal | |
969 | status mechanism. */ | |
970 | ||
971 | registers_changed (); | |
b83266a0 | 972 | |
c906108c SS |
973 | while (1) |
974 | { | |
cd0fc7c3 | 975 | if (target_wait_hook) |
39f77062 | 976 | ecs->ptid = target_wait_hook (ecs->waiton_ptid, ecs->wp); |
cd0fc7c3 | 977 | else |
39f77062 | 978 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
c906108c | 979 | |
cd0fc7c3 SS |
980 | /* Now figure out what to do with the result of the result. */ |
981 | handle_inferior_event (ecs); | |
c906108c | 982 | |
cd0fc7c3 SS |
983 | if (!ecs->wait_some_more) |
984 | break; | |
985 | } | |
986 | do_cleanups (old_cleanups); | |
987 | } | |
c906108c | 988 | |
43ff13b4 JM |
989 | /* Asynchronous version of wait_for_inferior. It is called by the |
990 | event loop whenever a change of state is detected on the file | |
991 | descriptor corresponding to the target. It can be called more than | |
992 | once to complete a single execution command. In such cases we need | |
993 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
994 | last time that this function is called for a single execution | |
995 | command, then report to the user that the inferior has stopped, and | |
996 | do the necessary cleanups. */ | |
997 | ||
998 | struct execution_control_state async_ecss; | |
999 | struct execution_control_state *async_ecs; | |
1000 | ||
1001 | void | |
fba45db2 | 1002 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1003 | { |
1004 | static struct cleanup *old_cleanups; | |
1005 | ||
c5aa993b | 1006 | async_ecs = &async_ecss; |
43ff13b4 JM |
1007 | |
1008 | if (!async_ecs->wait_some_more) | |
1009 | { | |
488f131b | 1010 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
c5aa993b | 1011 | &step_resume_breakpoint); |
43ff13b4 | 1012 | make_exec_cleanup (delete_breakpoint_current_contents, |
c5aa993b | 1013 | &through_sigtramp_breakpoint); |
43ff13b4 JM |
1014 | |
1015 | /* Fill in with reasonable starting values. */ | |
1016 | init_execution_control_state (async_ecs); | |
1017 | ||
43ff13b4 | 1018 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1019 | previous_inferior_ptid = inferior_ptid; |
43ff13b4 JM |
1020 | |
1021 | overlay_cache_invalid = 1; | |
1022 | ||
1023 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1024 | because they can be loaded from the target while in target_wait. |
1025 | This makes remote debugging a bit more efficient for those | |
1026 | targets that provide critical registers as part of their normal | |
1027 | status mechanism. */ | |
43ff13b4 JM |
1028 | |
1029 | registers_changed (); | |
1030 | } | |
1031 | ||
1032 | if (target_wait_hook) | |
488f131b JB |
1033 | async_ecs->ptid = |
1034 | target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); | |
43ff13b4 | 1035 | else |
39f77062 | 1036 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 JM |
1037 | |
1038 | /* Now figure out what to do with the result of the result. */ | |
1039 | handle_inferior_event (async_ecs); | |
1040 | ||
1041 | if (!async_ecs->wait_some_more) | |
1042 | { | |
adf40b2e | 1043 | /* Do only the cleanups that have been added by this |
488f131b JB |
1044 | function. Let the continuations for the commands do the rest, |
1045 | if there are any. */ | |
43ff13b4 JM |
1046 | do_exec_cleanups (old_cleanups); |
1047 | normal_stop (); | |
c2d11a7d JM |
1048 | if (step_multi && stop_step) |
1049 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1050 | else | |
1051 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1052 | } |
1053 | } | |
1054 | ||
cd0fc7c3 SS |
1055 | /* Prepare an execution control state for looping through a |
1056 | wait_for_inferior-type loop. */ | |
1057 | ||
1058 | void | |
96baa820 | 1059 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1060 | { |
c2d11a7d | 1061 | /* ecs->another_trap? */ |
cd0fc7c3 SS |
1062 | ecs->random_signal = 0; |
1063 | ecs->remove_breakpoints_on_following_step = 0; | |
1064 | ecs->handling_longjmp = 0; /* FIXME */ | |
1065 | ecs->update_step_sp = 0; | |
1066 | ecs->stepping_through_solib_after_catch = 0; | |
1067 | ecs->stepping_through_solib_catchpoints = NULL; | |
1068 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1069 | ecs->stepping_through_sigtramp = 0; | |
1070 | ecs->sal = find_pc_line (prev_pc, 0); | |
1071 | ecs->current_line = ecs->sal.line; | |
1072 | ecs->current_symtab = ecs->sal.symtab; | |
1073 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1074 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1075 | ecs->wp = &(ecs->ws); |
1076 | } | |
1077 | ||
a0b3c4fd | 1078 | /* Call this function before setting step_resume_breakpoint, as a |
53a5351d JM |
1079 | sanity check. There should never be more than one step-resume |
1080 | breakpoint per thread, so we should never be setting a new | |
1081 | step_resume_breakpoint when one is already active. */ | |
a0b3c4fd | 1082 | static void |
96baa820 | 1083 | check_for_old_step_resume_breakpoint (void) |
a0b3c4fd JM |
1084 | { |
1085 | if (step_resume_breakpoint) | |
488f131b JB |
1086 | warning |
1087 | ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint"); | |
a0b3c4fd JM |
1088 | } |
1089 | ||
e02bc4cc DS |
1090 | /* Return the cached copy of the last pid/waitstatus returned by |
1091 | target_wait()/target_wait_hook(). The data is actually cached by | |
1092 | handle_inferior_event(), which gets called immediately after | |
1093 | target_wait()/target_wait_hook(). */ | |
1094 | ||
1095 | void | |
488f131b | 1096 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1097 | { |
39f77062 | 1098 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1099 | *status = target_last_waitstatus; |
1100 | } | |
1101 | ||
dd80620e MS |
1102 | /* Switch thread contexts, maintaining "infrun state". */ |
1103 | ||
1104 | static void | |
1105 | context_switch (struct execution_control_state *ecs) | |
1106 | { | |
1107 | /* Caution: it may happen that the new thread (or the old one!) | |
1108 | is not in the thread list. In this case we must not attempt | |
1109 | to "switch context", or we run the risk that our context may | |
1110 | be lost. This may happen as a result of the target module | |
1111 | mishandling thread creation. */ | |
1112 | ||
1113 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) | |
488f131b | 1114 | { /* Perform infrun state context switch: */ |
dd80620e | 1115 | /* Save infrun state for the old thread. */ |
0ce3d317 | 1116 | save_infrun_state (inferior_ptid, prev_pc, |
dd80620e | 1117 | trap_expected, step_resume_breakpoint, |
488f131b | 1118 | through_sigtramp_breakpoint, step_range_start, |
aa0cd9c1 | 1119 | step_range_end, &step_frame_id, |
dd80620e MS |
1120 | ecs->handling_longjmp, ecs->another_trap, |
1121 | ecs->stepping_through_solib_after_catch, | |
1122 | ecs->stepping_through_solib_catchpoints, | |
1123 | ecs->stepping_through_sigtramp, | |
488f131b | 1124 | ecs->current_line, ecs->current_symtab, step_sp); |
dd80620e MS |
1125 | |
1126 | /* Load infrun state for the new thread. */ | |
0ce3d317 | 1127 | load_infrun_state (ecs->ptid, &prev_pc, |
dd80620e | 1128 | &trap_expected, &step_resume_breakpoint, |
488f131b | 1129 | &through_sigtramp_breakpoint, &step_range_start, |
aa0cd9c1 | 1130 | &step_range_end, &step_frame_id, |
dd80620e MS |
1131 | &ecs->handling_longjmp, &ecs->another_trap, |
1132 | &ecs->stepping_through_solib_after_catch, | |
1133 | &ecs->stepping_through_solib_catchpoints, | |
488f131b JB |
1134 | &ecs->stepping_through_sigtramp, |
1135 | &ecs->current_line, &ecs->current_symtab, &step_sp); | |
dd80620e MS |
1136 | } |
1137 | inferior_ptid = ecs->ptid; | |
1138 | } | |
1139 | ||
0ce3d317 AC |
1140 | /* Wrapper for PC_IN_SIGTRAMP that takes care of the need to find the |
1141 | function's name. | |
1142 | ||
1143 | In a classic example of "left hand VS right hand", "infrun.c" was | |
1144 | trying to improve GDB's performance by caching the result of calls | |
1145 | to calls to find_pc_partial_funtion, while at the same time | |
1146 | find_pc_partial_function was also trying to ramp up performance by | |
1147 | caching its most recent return value. The below makes the the | |
1148 | function find_pc_partial_function solely responsibile for | |
1149 | performance issues (the local cache that relied on a global | |
1150 | variable - arrrggg - deleted). | |
1151 | ||
1152 | Using the testsuite and gcov, it was found that dropping the local | |
1153 | "infrun.c" cache and instead relying on find_pc_partial_function | |
1154 | increased the number of calls to 12000 (from 10000), but the number | |
1155 | of times find_pc_partial_function's cache missed (this is what | |
1156 | matters) was only increased by only 4 (to 3569). (A quick back of | |
1157 | envelope caculation suggests that the extra 2000 function calls | |
1158 | @1000 extra instructions per call make the 1 MIP VAX testsuite run | |
1159 | take two extra seconds, oops :-) | |
1160 | ||
1161 | Long term, this function can be eliminated, replaced by the code: | |
1162 | get_frame_type(current_frame()) == SIGTRAMP_FRAME (for new | |
1163 | architectures this is very cheap). */ | |
1164 | ||
1165 | static int | |
1166 | pc_in_sigtramp (CORE_ADDR pc) | |
1167 | { | |
1168 | char *name; | |
1169 | find_pc_partial_function (pc, &name, NULL, NULL); | |
1170 | return PC_IN_SIGTRAMP (pc, name); | |
1171 | } | |
1172 | ||
dd80620e | 1173 | |
cd0fc7c3 SS |
1174 | /* Given an execution control state that has been freshly filled in |
1175 | by an event from the inferior, figure out what it means and take | |
1176 | appropriate action. */ | |
c906108c | 1177 | |
cd0fc7c3 | 1178 | void |
96baa820 | 1179 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 1180 | { |
d764a824 | 1181 | CORE_ADDR real_stop_pc; |
65e82032 AC |
1182 | /* NOTE: cagney/2003-03-28: If you're looking at this code and |
1183 | thinking that the variable stepped_after_stopped_by_watchpoint | |
1184 | isn't used, then you're wrong! The macro STOPPED_BY_WATCHPOINT, | |
1185 | defined in the file "config/pa/nm-hppah.h", accesses the variable | |
1186 | indirectly. Mutter something rude about the HP merge. */ | |
cd0fc7c3 | 1187 | int stepped_after_stopped_by_watchpoint; |
c8edd8b4 | 1188 | int sw_single_step_trap_p = 0; |
cd0fc7c3 | 1189 | |
e02bc4cc | 1190 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1191 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1192 | target_last_waitstatus = *ecs->wp; |
1193 | ||
488f131b JB |
1194 | switch (ecs->infwait_state) |
1195 | { | |
1196 | case infwait_thread_hop_state: | |
1197 | /* Cancel the waiton_ptid. */ | |
1198 | ecs->waiton_ptid = pid_to_ptid (-1); | |
65e82032 AC |
1199 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event |
1200 | is serviced in this loop, below. */ | |
1201 | if (ecs->enable_hw_watchpoints_after_wait) | |
1202 | { | |
1203 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1204 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1205 | } | |
1206 | stepped_after_stopped_by_watchpoint = 0; | |
1207 | break; | |
b83266a0 | 1208 | |
488f131b JB |
1209 | case infwait_normal_state: |
1210 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event | |
1211 | is serviced in this loop, below. */ | |
1212 | if (ecs->enable_hw_watchpoints_after_wait) | |
1213 | { | |
1214 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1215 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1216 | } | |
1217 | stepped_after_stopped_by_watchpoint = 0; | |
1218 | break; | |
b83266a0 | 1219 | |
488f131b | 1220 | case infwait_nullified_state: |
65e82032 | 1221 | stepped_after_stopped_by_watchpoint = 0; |
488f131b | 1222 | break; |
b83266a0 | 1223 | |
488f131b JB |
1224 | case infwait_nonstep_watch_state: |
1225 | insert_breakpoints (); | |
c906108c | 1226 | |
488f131b JB |
1227 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1228 | handle things like signals arriving and other things happening | |
1229 | in combination correctly? */ | |
1230 | stepped_after_stopped_by_watchpoint = 1; | |
1231 | break; | |
65e82032 AC |
1232 | |
1233 | default: | |
1234 | internal_error (__FILE__, __LINE__, "bad switch"); | |
488f131b JB |
1235 | } |
1236 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1237 | |
488f131b | 1238 | flush_cached_frames (); |
c906108c | 1239 | |
488f131b | 1240 | /* If it's a new process, add it to the thread database */ |
c906108c | 1241 | |
488f131b JB |
1242 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
1243 | && !in_thread_list (ecs->ptid)); | |
1244 | ||
1245 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1246 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1247 | { | |
1248 | add_thread (ecs->ptid); | |
c906108c | 1249 | |
488f131b JB |
1250 | ui_out_text (uiout, "[New "); |
1251 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); | |
1252 | ui_out_text (uiout, "]\n"); | |
c906108c SS |
1253 | |
1254 | #if 0 | |
488f131b JB |
1255 | /* NOTE: This block is ONLY meant to be invoked in case of a |
1256 | "thread creation event"! If it is invoked for any other | |
1257 | sort of event (such as a new thread landing on a breakpoint), | |
1258 | the event will be discarded, which is almost certainly | |
1259 | a bad thing! | |
1260 | ||
1261 | To avoid this, the low-level module (eg. target_wait) | |
1262 | should call in_thread_list and add_thread, so that the | |
1263 | new thread is known by the time we get here. */ | |
1264 | ||
1265 | /* We may want to consider not doing a resume here in order | |
1266 | to give the user a chance to play with the new thread. | |
1267 | It might be good to make that a user-settable option. */ | |
1268 | ||
1269 | /* At this point, all threads are stopped (happens | |
1270 | automatically in either the OS or the native code). | |
1271 | Therefore we need to continue all threads in order to | |
1272 | make progress. */ | |
1273 | ||
1274 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1275 | prepare_to_wait (ecs); | |
1276 | return; | |
c906108c | 1277 | #endif |
488f131b | 1278 | } |
c906108c | 1279 | |
488f131b JB |
1280 | switch (ecs->ws.kind) |
1281 | { | |
1282 | case TARGET_WAITKIND_LOADED: | |
1283 | /* Ignore gracefully during startup of the inferior, as it | |
1284 | might be the shell which has just loaded some objects, | |
1285 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1286 | #ifdef SOLIB_ADD |
c0236d92 | 1287 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b JB |
1288 | { |
1289 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1290 | breakpoint addresses via breakpoint_re_set. */ | |
1291 | if (breakpoints_inserted) | |
1292 | remove_breakpoints (); | |
c906108c | 1293 | |
488f131b JB |
1294 | /* Check for any newly added shared libraries if we're |
1295 | supposed to be adding them automatically. Switch | |
1296 | terminal for any messages produced by | |
1297 | breakpoint_re_set. */ | |
1298 | target_terminal_ours_for_output (); | |
1299 | SOLIB_ADD (NULL, 0, NULL, auto_solib_add); | |
1300 | target_terminal_inferior (); | |
1301 | ||
1302 | /* Reinsert breakpoints and continue. */ | |
1303 | if (breakpoints_inserted) | |
1304 | insert_breakpoints (); | |
1305 | } | |
c906108c | 1306 | #endif |
488f131b JB |
1307 | resume (0, TARGET_SIGNAL_0); |
1308 | prepare_to_wait (ecs); | |
1309 | return; | |
c5aa993b | 1310 | |
488f131b JB |
1311 | case TARGET_WAITKIND_SPURIOUS: |
1312 | resume (0, TARGET_SIGNAL_0); | |
1313 | prepare_to_wait (ecs); | |
1314 | return; | |
c5aa993b | 1315 | |
488f131b JB |
1316 | case TARGET_WAITKIND_EXITED: |
1317 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
1318 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
1319 | ||
1320 | /* Record the exit code in the convenience variable $_exitcode, so | |
1321 | that the user can inspect this again later. */ | |
1322 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1323 | value_from_longest (builtin_type_int, | |
1324 | (LONGEST) ecs->ws.value.integer)); | |
1325 | gdb_flush (gdb_stdout); | |
1326 | target_mourn_inferior (); | |
1327 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1328 | stop_print_frame = 0; | |
1329 | stop_stepping (ecs); | |
1330 | return; | |
c5aa993b | 1331 | |
488f131b JB |
1332 | case TARGET_WAITKIND_SIGNALLED: |
1333 | stop_print_frame = 0; | |
1334 | stop_signal = ecs->ws.value.sig; | |
1335 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1336 | |
488f131b JB |
1337 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1338 | reach here unless the inferior is dead. However, for years | |
1339 | target_kill() was called here, which hints that fatal signals aren't | |
1340 | really fatal on some systems. If that's true, then some changes | |
1341 | may be needed. */ | |
1342 | target_mourn_inferior (); | |
c906108c | 1343 | |
488f131b JB |
1344 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
1345 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1346 | stop_stepping (ecs); | |
1347 | return; | |
c906108c | 1348 | |
488f131b JB |
1349 | /* The following are the only cases in which we keep going; |
1350 | the above cases end in a continue or goto. */ | |
1351 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 1352 | case TARGET_WAITKIND_VFORKED: |
488f131b JB |
1353 | stop_signal = TARGET_SIGNAL_TRAP; |
1354 | pending_follow.kind = ecs->ws.kind; | |
1355 | ||
8e7d2c16 DJ |
1356 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
1357 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c | 1358 | |
488f131b | 1359 | stop_pc = read_pc (); |
675bf4cb DJ |
1360 | |
1361 | /* Assume that catchpoints are not really software breakpoints. If | |
1362 | some future target implements them using software breakpoints then | |
1363 | that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus | |
1364 | we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that | |
1365 | bpstat_stop_status will not decrement the PC. */ | |
1366 | ||
1367 | stop_bpstat = bpstat_stop_status (&stop_pc, 1); | |
1368 | ||
488f131b | 1369 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
04e68871 DJ |
1370 | |
1371 | /* If no catchpoint triggered for this, then keep going. */ | |
1372 | if (ecs->random_signal) | |
1373 | { | |
1374 | stop_signal = TARGET_SIGNAL_0; | |
1375 | keep_going (ecs); | |
1376 | return; | |
1377 | } | |
488f131b JB |
1378 | goto process_event_stop_test; |
1379 | ||
1380 | case TARGET_WAITKIND_EXECD: | |
1381 | stop_signal = TARGET_SIGNAL_TRAP; | |
1382 | ||
7d2830a3 DJ |
1383 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
1384 | target_wait function. Until then following vfork on HP/UX 10.20 | |
1385 | is probably broken by this. Of course, it's broken anyway. */ | |
488f131b JB |
1386 | /* Is this a target which reports multiple exec events per actual |
1387 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1388 | ignore all but the last one. Just resume the exec'r, and wait | |
1389 | for the next exec event. */ | |
1390 | if (inferior_ignoring_leading_exec_events) | |
1391 | { | |
1392 | inferior_ignoring_leading_exec_events--; | |
1393 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1394 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event. | |
1395 | parent_pid); | |
1396 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); | |
1397 | prepare_to_wait (ecs); | |
1398 | return; | |
1399 | } | |
1400 | inferior_ignoring_leading_exec_events = | |
1401 | target_reported_exec_events_per_exec_call () - 1; | |
1402 | ||
1403 | pending_follow.execd_pathname = | |
1404 | savestring (ecs->ws.value.execd_pathname, | |
1405 | strlen (ecs->ws.value.execd_pathname)); | |
1406 | ||
488f131b JB |
1407 | /* This causes the eventpoints and symbol table to be reset. Must |
1408 | do this now, before trying to determine whether to stop. */ | |
1409 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); | |
1410 | xfree (pending_follow.execd_pathname); | |
c906108c | 1411 | |
488f131b JB |
1412 | stop_pc = read_pc_pid (ecs->ptid); |
1413 | ecs->saved_inferior_ptid = inferior_ptid; | |
1414 | inferior_ptid = ecs->ptid; | |
675bf4cb DJ |
1415 | |
1416 | /* Assume that catchpoints are not really software breakpoints. If | |
1417 | some future target implements them using software breakpoints then | |
1418 | that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus | |
1419 | we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that | |
1420 | bpstat_stop_status will not decrement the PC. */ | |
1421 | ||
1422 | stop_bpstat = bpstat_stop_status (&stop_pc, 1); | |
1423 | ||
488f131b JB |
1424 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1425 | inferior_ptid = ecs->saved_inferior_ptid; | |
04e68871 DJ |
1426 | |
1427 | /* If no catchpoint triggered for this, then keep going. */ | |
1428 | if (ecs->random_signal) | |
1429 | { | |
1430 | stop_signal = TARGET_SIGNAL_0; | |
1431 | keep_going (ecs); | |
1432 | return; | |
1433 | } | |
488f131b JB |
1434 | goto process_event_stop_test; |
1435 | ||
1436 | /* These syscall events are returned on HP-UX, as part of its | |
1437 | implementation of page-protection-based "hardware" watchpoints. | |
1438 | HP-UX has unfortunate interactions between page-protections and | |
1439 | some system calls. Our solution is to disable hardware watches | |
1440 | when a system call is entered, and reenable them when the syscall | |
1441 | completes. The downside of this is that we may miss the precise | |
1442 | point at which a watched piece of memory is modified. "Oh well." | |
1443 | ||
1444 | Note that we may have multiple threads running, which may each | |
1445 | enter syscalls at roughly the same time. Since we don't have a | |
1446 | good notion currently of whether a watched piece of memory is | |
1447 | thread-private, we'd best not have any page-protections active | |
1448 | when any thread is in a syscall. Thus, we only want to reenable | |
1449 | hardware watches when no threads are in a syscall. | |
1450 | ||
1451 | Also, be careful not to try to gather much state about a thread | |
1452 | that's in a syscall. It's frequently a losing proposition. */ | |
1453 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
1454 | number_of_threads_in_syscalls++; | |
1455 | if (number_of_threads_in_syscalls == 1) | |
1456 | { | |
1457 | TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1458 | } | |
1459 | resume (0, TARGET_SIGNAL_0); | |
1460 | prepare_to_wait (ecs); | |
1461 | return; | |
c906108c | 1462 | |
488f131b JB |
1463 | /* Before examining the threads further, step this thread to |
1464 | get it entirely out of the syscall. (We get notice of the | |
1465 | event when the thread is just on the verge of exiting a | |
1466 | syscall. Stepping one instruction seems to get it back | |
1467 | into user code.) | |
c906108c | 1468 | |
488f131b JB |
1469 | Note that although the logical place to reenable h/w watches |
1470 | is here, we cannot. We cannot reenable them before stepping | |
1471 | the thread (this causes the next wait on the thread to hang). | |
c4093a6a | 1472 | |
488f131b JB |
1473 | Nor can we enable them after stepping until we've done a wait. |
1474 | Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait | |
1475 | here, which will be serviced immediately after the target | |
1476 | is waited on. */ | |
1477 | case TARGET_WAITKIND_SYSCALL_RETURN: | |
1478 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); | |
1479 | ||
1480 | if (number_of_threads_in_syscalls > 0) | |
1481 | { | |
1482 | number_of_threads_in_syscalls--; | |
1483 | ecs->enable_hw_watchpoints_after_wait = | |
1484 | (number_of_threads_in_syscalls == 0); | |
1485 | } | |
1486 | prepare_to_wait (ecs); | |
1487 | return; | |
c906108c | 1488 | |
488f131b JB |
1489 | case TARGET_WAITKIND_STOPPED: |
1490 | stop_signal = ecs->ws.value.sig; | |
1491 | break; | |
c906108c | 1492 | |
488f131b JB |
1493 | /* We had an event in the inferior, but we are not interested |
1494 | in handling it at this level. The lower layers have already | |
8e7d2c16 DJ |
1495 | done what needs to be done, if anything. |
1496 | ||
1497 | One of the possible circumstances for this is when the | |
1498 | inferior produces output for the console. The inferior has | |
1499 | not stopped, and we are ignoring the event. Another possible | |
1500 | circumstance is any event which the lower level knows will be | |
1501 | reported multiple times without an intervening resume. */ | |
488f131b | 1502 | case TARGET_WAITKIND_IGNORE: |
8e7d2c16 | 1503 | prepare_to_wait (ecs); |
488f131b JB |
1504 | return; |
1505 | } | |
c906108c | 1506 | |
488f131b JB |
1507 | /* We may want to consider not doing a resume here in order to give |
1508 | the user a chance to play with the new thread. It might be good | |
1509 | to make that a user-settable option. */ | |
c906108c | 1510 | |
488f131b JB |
1511 | /* At this point, all threads are stopped (happens automatically in |
1512 | either the OS or the native code). Therefore we need to continue | |
1513 | all threads in order to make progress. */ | |
1514 | if (ecs->new_thread_event) | |
1515 | { | |
1516 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1517 | prepare_to_wait (ecs); | |
1518 | return; | |
1519 | } | |
c906108c | 1520 | |
488f131b JB |
1521 | stop_pc = read_pc_pid (ecs->ptid); |
1522 | ||
1523 | /* See if a thread hit a thread-specific breakpoint that was meant for | |
1524 | another thread. If so, then step that thread past the breakpoint, | |
1525 | and continue it. */ | |
1526 | ||
1527 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1528 | { | |
f8d40ec8 JB |
1529 | /* Check if a regular breakpoint has been hit before checking |
1530 | for a potential single step breakpoint. Otherwise, GDB will | |
1531 | not see this breakpoint hit when stepping onto breakpoints. */ | |
1532 | if (breakpoints_inserted | |
1533 | && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK)) | |
488f131b | 1534 | { |
c5aa993b | 1535 | ecs->random_signal = 0; |
488f131b JB |
1536 | if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, |
1537 | ecs->ptid)) | |
1538 | { | |
1539 | int remove_status; | |
1540 | ||
1541 | /* Saw a breakpoint, but it was hit by the wrong thread. | |
1542 | Just continue. */ | |
1543 | if (DECR_PC_AFTER_BREAK) | |
1544 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, ecs->ptid); | |
1545 | ||
1546 | remove_status = remove_breakpoints (); | |
1547 | /* Did we fail to remove breakpoints? If so, try | |
1548 | to set the PC past the bp. (There's at least | |
1549 | one situation in which we can fail to remove | |
1550 | the bp's: On HP-UX's that use ttrace, we can't | |
1551 | change the address space of a vforking child | |
1552 | process until the child exits (well, okay, not | |
1553 | then either :-) or execs. */ | |
1554 | if (remove_status != 0) | |
1555 | { | |
1556 | /* FIXME! This is obviously non-portable! */ | |
1557 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, ecs->ptid); | |
1558 | /* We need to restart all the threads now, | |
1559 | * unles we're running in scheduler-locked mode. | |
1560 | * Use currently_stepping to determine whether to | |
1561 | * step or continue. | |
1562 | */ | |
1563 | /* FIXME MVS: is there any reason not to call resume()? */ | |
1564 | if (scheduler_mode == schedlock_on) | |
1565 | target_resume (ecs->ptid, | |
1566 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1567 | else | |
1568 | target_resume (RESUME_ALL, | |
1569 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1570 | prepare_to_wait (ecs); | |
1571 | return; | |
1572 | } | |
1573 | else | |
1574 | { /* Single step */ | |
1575 | breakpoints_inserted = 0; | |
1576 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
1577 | context_switch (ecs); | |
1578 | ecs->waiton_ptid = ecs->ptid; | |
1579 | ecs->wp = &(ecs->ws); | |
1580 | ecs->another_trap = 1; | |
1581 | ||
1582 | ecs->infwait_state = infwait_thread_hop_state; | |
1583 | keep_going (ecs); | |
1584 | registers_changed (); | |
1585 | return; | |
1586 | } | |
1587 | } | |
1588 | } | |
f8d40ec8 JB |
1589 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1590 | { | |
c8edd8b4 JB |
1591 | /* Readjust the stop_pc as it is off by DECR_PC_AFTER_BREAK |
1592 | compared to the value it would have if the system stepping | |
1593 | capability was used. This allows the rest of the code in | |
1594 | this function to use this address without having to worry | |
1595 | whether software single step is in use or not. */ | |
1596 | if (DECR_PC_AFTER_BREAK) | |
1597 | { | |
1598 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1599 | write_pc_pid (stop_pc, ecs->ptid); | |
1600 | } | |
1601 | ||
1602 | sw_single_step_trap_p = 1; | |
f8d40ec8 JB |
1603 | ecs->random_signal = 0; |
1604 | } | |
488f131b JB |
1605 | } |
1606 | else | |
1607 | ecs->random_signal = 1; | |
c906108c | 1608 | |
488f131b JB |
1609 | /* See if something interesting happened to the non-current thread. If |
1610 | so, then switch to that thread, and eventually give control back to | |
1611 | the user. | |
1612 | ||
1613 | Note that if there's any kind of pending follow (i.e., of a fork, | |
1614 | vfork or exec), we don't want to do this now. Rather, we'll let | |
1615 | the next resume handle it. */ | |
1616 | if (!ptid_equal (ecs->ptid, inferior_ptid) && | |
1617 | (pending_follow.kind == TARGET_WAITKIND_SPURIOUS)) | |
1618 | { | |
1619 | int printed = 0; | |
1620 | ||
1621 | /* If it's a random signal for a non-current thread, notify user | |
1622 | if he's expressed an interest. */ | |
1623 | if (ecs->random_signal && signal_print[stop_signal]) | |
1624 | { | |
c906108c SS |
1625 | /* ??rehrauer: I don't understand the rationale for this code. If the |
1626 | inferior will stop as a result of this signal, then the act of handling | |
1627 | the stop ought to print a message that's couches the stoppage in user | |
1628 | terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior | |
1629 | won't stop as a result of the signal -- i.e., if the signal is merely | |
1630 | a side-effect of something GDB's doing "under the covers" for the | |
1631 | user, such as stepping threads over a breakpoint they shouldn't stop | |
1632 | for -- then the message seems to be a serious annoyance at best. | |
1633 | ||
1634 | For now, remove the message altogether. */ | |
1635 | #if 0 | |
488f131b JB |
1636 | printed = 1; |
1637 | target_terminal_ours_for_output (); | |
1638 | printf_filtered ("\nProgram received signal %s, %s.\n", | |
1639 | target_signal_to_name (stop_signal), | |
1640 | target_signal_to_string (stop_signal)); | |
1641 | gdb_flush (gdb_stdout); | |
c906108c | 1642 | #endif |
488f131b | 1643 | } |
c906108c | 1644 | |
488f131b JB |
1645 | /* If it's not SIGTRAP and not a signal we want to stop for, then |
1646 | continue the thread. */ | |
c906108c | 1647 | |
488f131b JB |
1648 | if (stop_signal != TARGET_SIGNAL_TRAP && !signal_stop[stop_signal]) |
1649 | { | |
1650 | if (printed) | |
1651 | target_terminal_inferior (); | |
c906108c | 1652 | |
488f131b JB |
1653 | /* Clear the signal if it should not be passed. */ |
1654 | if (signal_program[stop_signal] == 0) | |
1655 | stop_signal = TARGET_SIGNAL_0; | |
c906108c | 1656 | |
488f131b JB |
1657 | target_resume (ecs->ptid, 0, stop_signal); |
1658 | prepare_to_wait (ecs); | |
1659 | return; | |
1660 | } | |
c906108c | 1661 | |
488f131b JB |
1662 | /* It's a SIGTRAP or a signal we're interested in. Switch threads, |
1663 | and fall into the rest of wait_for_inferior(). */ | |
c5aa993b | 1664 | |
488f131b | 1665 | context_switch (ecs); |
c5aa993b | 1666 | |
488f131b JB |
1667 | if (context_hook) |
1668 | context_hook (pid_to_thread_id (ecs->ptid)); | |
c5aa993b | 1669 | |
488f131b JB |
1670 | flush_cached_frames (); |
1671 | } | |
c906108c | 1672 | |
488f131b JB |
1673 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1674 | { | |
1675 | /* Pull the single step breakpoints out of the target. */ | |
1676 | SOFTWARE_SINGLE_STEP (0, 0); | |
1677 | singlestep_breakpoints_inserted_p = 0; | |
1678 | } | |
c906108c | 1679 | |
488f131b JB |
1680 | /* If PC is pointing at a nullified instruction, then step beyond |
1681 | it so that the user won't be confused when GDB appears to be ready | |
1682 | to execute it. */ | |
c906108c | 1683 | |
488f131b JB |
1684 | /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */ |
1685 | if (INSTRUCTION_NULLIFIED) | |
1686 | { | |
1687 | registers_changed (); | |
1688 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); | |
c906108c | 1689 | |
488f131b JB |
1690 | /* We may have received a signal that we want to pass to |
1691 | the inferior; therefore, we must not clobber the waitstatus | |
1692 | in WS. */ | |
c906108c | 1693 | |
488f131b JB |
1694 | ecs->infwait_state = infwait_nullified_state; |
1695 | ecs->waiton_ptid = ecs->ptid; | |
1696 | ecs->wp = &(ecs->tmpstatus); | |
1697 | prepare_to_wait (ecs); | |
1698 | return; | |
1699 | } | |
c906108c | 1700 | |
488f131b JB |
1701 | /* It may not be necessary to disable the watchpoint to stop over |
1702 | it. For example, the PA can (with some kernel cooperation) | |
1703 | single step over a watchpoint without disabling the watchpoint. */ | |
1704 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1705 | { | |
1706 | resume (1, 0); | |
1707 | prepare_to_wait (ecs); | |
1708 | return; | |
1709 | } | |
c906108c | 1710 | |
488f131b JB |
1711 | /* It is far more common to need to disable a watchpoint to step |
1712 | the inferior over it. FIXME. What else might a debug | |
1713 | register or page protection watchpoint scheme need here? */ | |
1714 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1715 | { | |
1716 | /* At this point, we are stopped at an instruction which has | |
1717 | attempted to write to a piece of memory under control of | |
1718 | a watchpoint. The instruction hasn't actually executed | |
1719 | yet. If we were to evaluate the watchpoint expression | |
1720 | now, we would get the old value, and therefore no change | |
1721 | would seem to have occurred. | |
1722 | ||
1723 | In order to make watchpoints work `right', we really need | |
1724 | to complete the memory write, and then evaluate the | |
1725 | watchpoint expression. The following code does that by | |
1726 | removing the watchpoint (actually, all watchpoints and | |
1727 | breakpoints), single-stepping the target, re-inserting | |
1728 | watchpoints, and then falling through to let normal | |
1729 | single-step processing handle proceed. Since this | |
1730 | includes evaluating watchpoints, things will come to a | |
1731 | stop in the correct manner. */ | |
1732 | ||
1733 | if (DECR_PC_AFTER_BREAK) | |
1734 | write_pc (stop_pc - DECR_PC_AFTER_BREAK); | |
c5aa993b | 1735 | |
488f131b JB |
1736 | remove_breakpoints (); |
1737 | registers_changed (); | |
1738 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
c5aa993b | 1739 | |
488f131b JB |
1740 | ecs->waiton_ptid = ecs->ptid; |
1741 | ecs->wp = &(ecs->ws); | |
1742 | ecs->infwait_state = infwait_nonstep_watch_state; | |
1743 | prepare_to_wait (ecs); | |
1744 | return; | |
1745 | } | |
1746 | ||
1747 | /* It may be possible to simply continue after a watchpoint. */ | |
1748 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
1749 | STOPPED_BY_WATCHPOINT (ecs->ws); | |
1750 | ||
1751 | ecs->stop_func_start = 0; | |
1752 | ecs->stop_func_end = 0; | |
1753 | ecs->stop_func_name = 0; | |
1754 | /* Don't care about return value; stop_func_start and stop_func_name | |
1755 | will both be 0 if it doesn't work. */ | |
1756 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
1757 | &ecs->stop_func_start, &ecs->stop_func_end); | |
1758 | ecs->stop_func_start += FUNCTION_START_OFFSET; | |
1759 | ecs->another_trap = 0; | |
1760 | bpstat_clear (&stop_bpstat); | |
1761 | stop_step = 0; | |
1762 | stop_stack_dummy = 0; | |
1763 | stop_print_frame = 1; | |
1764 | ecs->random_signal = 0; | |
1765 | stopped_by_random_signal = 0; | |
1766 | breakpoints_failed = 0; | |
1767 | ||
1768 | /* Look at the cause of the stop, and decide what to do. | |
1769 | The alternatives are: | |
1770 | 1) break; to really stop and return to the debugger, | |
1771 | 2) drop through to start up again | |
1772 | (set ecs->another_trap to 1 to single step once) | |
1773 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
1774 | will be made according to the signal handling tables. */ | |
1775 | ||
1776 | /* First, distinguish signals caused by the debugger from signals | |
1777 | that have to do with the program's own actions. | |
1778 | Note that breakpoint insns may cause SIGTRAP or SIGILL | |
1779 | or SIGEMT, depending on the operating system version. | |
1780 | Here we detect when a SIGILL or SIGEMT is really a breakpoint | |
1781 | and change it to SIGTRAP. */ | |
1782 | ||
1783 | if (stop_signal == TARGET_SIGNAL_TRAP | |
1784 | || (breakpoints_inserted && | |
1785 | (stop_signal == TARGET_SIGNAL_ILL | |
c54cfec8 | 1786 | || stop_signal == TARGET_SIGNAL_EMT)) |
c0236d92 EZ |
1787 | || stop_soon == STOP_QUIETLY |
1788 | || stop_soon == STOP_QUIETLY_NO_SIGSTOP) | |
488f131b JB |
1789 | { |
1790 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1791 | { | |
1792 | stop_print_frame = 0; | |
1793 | stop_stepping (ecs); | |
1794 | return; | |
1795 | } | |
c54cfec8 EZ |
1796 | |
1797 | /* This is originated from start_remote(), start_inferior() and | |
1798 | shared libraries hook functions. */ | |
c0236d92 | 1799 | if (stop_soon == STOP_QUIETLY) |
488f131b JB |
1800 | { |
1801 | stop_stepping (ecs); | |
1802 | return; | |
1803 | } | |
1804 | ||
c54cfec8 EZ |
1805 | /* This originates from attach_command(). We need to overwrite |
1806 | the stop_signal here, because some kernels don't ignore a | |
1807 | SIGSTOP in a subsequent ptrace(PTRACE_SONT,SOGSTOP) call. | |
1808 | See more comments in inferior.h. */ | |
c0236d92 | 1809 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP) |
c54cfec8 EZ |
1810 | { |
1811 | stop_stepping (ecs); | |
1812 | if (stop_signal == TARGET_SIGNAL_STOP) | |
1813 | stop_signal = TARGET_SIGNAL_0; | |
1814 | return; | |
1815 | } | |
1816 | ||
488f131b JB |
1817 | /* Don't even think about breakpoints |
1818 | if just proceeded over a breakpoint. | |
1819 | ||
1820 | However, if we are trying to proceed over a breakpoint | |
1821 | and end up in sigtramp, then through_sigtramp_breakpoint | |
1822 | will be set and we should check whether we've hit the | |
1823 | step breakpoint. */ | |
1824 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected | |
1825 | && through_sigtramp_breakpoint == NULL) | |
1826 | bpstat_clear (&stop_bpstat); | |
1827 | else | |
1828 | { | |
1829 | /* See if there is a breakpoint at the current PC. */ | |
1830 | ||
1831 | /* The second argument of bpstat_stop_status is meant to help | |
1832 | distinguish between a breakpoint trap and a singlestep trap. | |
1833 | This is only important on targets where DECR_PC_AFTER_BREAK | |
1834 | is non-zero. The prev_pc test is meant to distinguish between | |
1835 | singlestepping a trap instruction, and singlestepping thru a | |
3e6564e1 JB |
1836 | jump to the instruction following a trap instruction. |
1837 | ||
1838 | Therefore, pass TRUE if our reason for stopping is | |
1839 | something other than hitting a breakpoint. We do this by | |
1840 | checking that either: we detected earlier a software single | |
1841 | step trap or, 1) stepping is going on and 2) we didn't hit | |
1842 | a breakpoint in a signal handler without an intervening stop | |
1843 | in sigtramp, which is detected by a new stack pointer value | |
1844 | below any usual function calling stack adjustments. */ | |
238617f6 JB |
1845 | stop_bpstat = |
1846 | bpstat_stop_status | |
1847 | (&stop_pc, | |
c8edd8b4 JB |
1848 | sw_single_step_trap_p |
1849 | || (currently_stepping (ecs) | |
1850 | && prev_pc != stop_pc - DECR_PC_AFTER_BREAK | |
1851 | && !(step_range_end | |
1852 | && INNER_THAN (read_sp (), (step_sp - 16))))); | |
488f131b JB |
1853 | /* Following in case break condition called a |
1854 | function. */ | |
1855 | stop_print_frame = 1; | |
1856 | } | |
1857 | ||
73dd234f AC |
1858 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
1859 | at one stage in the past included checks for an inferior | |
1860 | function call's call dummy's return breakpoint. The original | |
1861 | comment, that went with the test, read: | |
1862 | ||
1863 | ``End of a stack dummy. Some systems (e.g. Sony news) give | |
1864 | another signal besides SIGTRAP, so check here as well as | |
1865 | above.'' | |
1866 | ||
1867 | If someone ever tries to get get call dummys on a | |
1868 | non-executable stack to work (where the target would stop | |
1869 | with something like a SIGSEG), then those tests might need to | |
1870 | be re-instated. Given, however, that the tests were only | |
1871 | enabled when momentary breakpoints were not being used, I | |
1872 | suspect that it won't be the case. */ | |
1873 | ||
488f131b JB |
1874 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1875 | ecs->random_signal | |
1876 | = !(bpstat_explains_signal (stop_bpstat) | |
1877 | || trap_expected | |
488f131b | 1878 | || (step_range_end && step_resume_breakpoint == NULL)); |
488f131b JB |
1879 | else |
1880 | { | |
73dd234f | 1881 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
488f131b JB |
1882 | if (!ecs->random_signal) |
1883 | stop_signal = TARGET_SIGNAL_TRAP; | |
1884 | } | |
1885 | } | |
1886 | ||
1887 | /* When we reach this point, we've pretty much decided | |
1888 | that the reason for stopping must've been a random | |
1889 | (unexpected) signal. */ | |
1890 | ||
1891 | else | |
1892 | ecs->random_signal = 1; | |
488f131b | 1893 | |
04e68871 | 1894 | process_event_stop_test: |
488f131b JB |
1895 | /* For the program's own signals, act according to |
1896 | the signal handling tables. */ | |
1897 | ||
1898 | if (ecs->random_signal) | |
1899 | { | |
1900 | /* Signal not for debugging purposes. */ | |
1901 | int printed = 0; | |
1902 | ||
1903 | stopped_by_random_signal = 1; | |
1904 | ||
1905 | if (signal_print[stop_signal]) | |
1906 | { | |
1907 | printed = 1; | |
1908 | target_terminal_ours_for_output (); | |
1909 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
1910 | } | |
1911 | if (signal_stop[stop_signal]) | |
1912 | { | |
1913 | stop_stepping (ecs); | |
1914 | return; | |
1915 | } | |
1916 | /* If not going to stop, give terminal back | |
1917 | if we took it away. */ | |
1918 | else if (printed) | |
1919 | target_terminal_inferior (); | |
1920 | ||
1921 | /* Clear the signal if it should not be passed. */ | |
1922 | if (signal_program[stop_signal] == 0) | |
1923 | stop_signal = TARGET_SIGNAL_0; | |
1924 | ||
1925 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
1926 | whether it could/should be keep_going. | |
1927 | ||
1928 | This used to jump to step_over_function if we are stepping, | |
1929 | which is wrong. | |
1930 | ||
1931 | Suppose the user does a `next' over a function call, and while | |
1932 | that call is in progress, the inferior receives a signal for | |
1933 | which GDB does not stop (i.e., signal_stop[SIG] is false). In | |
1934 | that case, when we reach this point, there is already a | |
1935 | step-resume breakpoint established, right where it should be: | |
1936 | immediately after the function call the user is "next"-ing | |
1937 | over. If we call step_over_function now, two bad things | |
1938 | happen: | |
1939 | ||
1940 | - we'll create a new breakpoint, at wherever the current | |
1941 | frame's return address happens to be. That could be | |
1942 | anywhere, depending on what function call happens to be on | |
1943 | the top of the stack at that point. Point is, it's probably | |
1944 | not where we need it. | |
1945 | ||
1946 | - the existing step-resume breakpoint (which is at the correct | |
1947 | address) will get orphaned: step_resume_breakpoint will point | |
1948 | to the new breakpoint, and the old step-resume breakpoint | |
1949 | will never be cleaned up. | |
1950 | ||
1951 | The old behavior was meant to help HP-UX single-step out of | |
1952 | sigtramps. It would place the new breakpoint at prev_pc, which | |
1953 | was certainly wrong. I don't know the details there, so fixing | |
1954 | this probably breaks that. As with anything else, it's up to | |
1955 | the HP-UX maintainer to furnish a fix that doesn't break other | |
1956 | platforms. --JimB, 20 May 1999 */ | |
1957 | check_sigtramp2 (ecs); | |
1958 | keep_going (ecs); | |
1959 | return; | |
1960 | } | |
1961 | ||
1962 | /* Handle cases caused by hitting a breakpoint. */ | |
1963 | { | |
1964 | CORE_ADDR jmp_buf_pc; | |
1965 | struct bpstat_what what; | |
1966 | ||
1967 | what = bpstat_what (stop_bpstat); | |
1968 | ||
1969 | if (what.call_dummy) | |
1970 | { | |
1971 | stop_stack_dummy = 1; | |
1972 | #ifdef HP_OS_BUG | |
1973 | trap_expected_after_continue = 1; | |
1974 | #endif | |
c5aa993b | 1975 | } |
c906108c | 1976 | |
488f131b | 1977 | switch (what.main_action) |
c5aa993b | 1978 | { |
488f131b JB |
1979 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
1980 | /* If we hit the breakpoint at longjmp, disable it for the | |
1981 | duration of this command. Then, install a temporary | |
1982 | breakpoint at the target of the jmp_buf. */ | |
1983 | disable_longjmp_breakpoint (); | |
1984 | remove_breakpoints (); | |
1985 | breakpoints_inserted = 0; | |
1986 | if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
c5aa993b | 1987 | { |
488f131b | 1988 | keep_going (ecs); |
104c1213 | 1989 | return; |
c5aa993b | 1990 | } |
488f131b JB |
1991 | |
1992 | /* Need to blow away step-resume breakpoint, as it | |
1993 | interferes with us */ | |
1994 | if (step_resume_breakpoint != NULL) | |
104c1213 | 1995 | { |
488f131b | 1996 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
104c1213 | 1997 | } |
488f131b JB |
1998 | /* Not sure whether we need to blow this away too, but probably |
1999 | it is like the step-resume breakpoint. */ | |
2000 | if (through_sigtramp_breakpoint != NULL) | |
c5aa993b | 2001 | { |
488f131b JB |
2002 | delete_breakpoint (through_sigtramp_breakpoint); |
2003 | through_sigtramp_breakpoint = NULL; | |
c5aa993b | 2004 | } |
c906108c | 2005 | |
488f131b JB |
2006 | #if 0 |
2007 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2008 | if (step_over_calls > 0) | |
2009 | set_longjmp_resume_breakpoint (jmp_buf_pc, get_current_frame ()); | |
c5aa993b | 2010 | else |
488f131b | 2011 | #endif /* 0 */ |
818dd999 | 2012 | set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
488f131b JB |
2013 | ecs->handling_longjmp = 1; /* FIXME */ |
2014 | keep_going (ecs); | |
2015 | return; | |
c906108c | 2016 | |
488f131b JB |
2017 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2018 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
2019 | remove_breakpoints (); | |
2020 | breakpoints_inserted = 0; | |
2021 | #if 0 | |
2022 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2023 | if (step_over_calls | |
aa0cd9c1 AC |
2024 | && (frame_id_inner (get_frame_id (get_current_frame ()), |
2025 | step_frame_id))) | |
c5aa993b | 2026 | { |
488f131b | 2027 | ecs->another_trap = 1; |
d4f3574e SS |
2028 | keep_going (ecs); |
2029 | return; | |
c5aa993b | 2030 | } |
488f131b JB |
2031 | #endif /* 0 */ |
2032 | disable_longjmp_breakpoint (); | |
2033 | ecs->handling_longjmp = 0; /* FIXME */ | |
2034 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2035 | break; | |
2036 | /* else fallthrough */ | |
2037 | ||
2038 | case BPSTAT_WHAT_SINGLE: | |
2039 | if (breakpoints_inserted) | |
c5aa993b | 2040 | { |
488f131b | 2041 | remove_breakpoints (); |
c5aa993b | 2042 | } |
488f131b JB |
2043 | breakpoints_inserted = 0; |
2044 | ecs->another_trap = 1; | |
2045 | /* Still need to check other stuff, at least the case | |
2046 | where we are stepping and step out of the right range. */ | |
2047 | break; | |
c906108c | 2048 | |
488f131b JB |
2049 | case BPSTAT_WHAT_STOP_NOISY: |
2050 | stop_print_frame = 1; | |
c906108c | 2051 | |
488f131b JB |
2052 | /* We are about to nuke the step_resume_breakpoint and |
2053 | through_sigtramp_breakpoint via the cleanup chain, so | |
2054 | no need to worry about it here. */ | |
c5aa993b | 2055 | |
488f131b JB |
2056 | stop_stepping (ecs); |
2057 | return; | |
c5aa993b | 2058 | |
488f131b JB |
2059 | case BPSTAT_WHAT_STOP_SILENT: |
2060 | stop_print_frame = 0; | |
c5aa993b | 2061 | |
488f131b JB |
2062 | /* We are about to nuke the step_resume_breakpoint and |
2063 | through_sigtramp_breakpoint via the cleanup chain, so | |
2064 | no need to worry about it here. */ | |
c5aa993b | 2065 | |
488f131b | 2066 | stop_stepping (ecs); |
e441088d | 2067 | return; |
c5aa993b | 2068 | |
488f131b JB |
2069 | case BPSTAT_WHAT_STEP_RESUME: |
2070 | /* This proably demands a more elegant solution, but, yeah | |
2071 | right... | |
c5aa993b | 2072 | |
488f131b JB |
2073 | This function's use of the simple variable |
2074 | step_resume_breakpoint doesn't seem to accomodate | |
2075 | simultaneously active step-resume bp's, although the | |
2076 | breakpoint list certainly can. | |
c5aa993b | 2077 | |
488f131b JB |
2078 | If we reach here and step_resume_breakpoint is already |
2079 | NULL, then apparently we have multiple active | |
2080 | step-resume bp's. We'll just delete the breakpoint we | |
2081 | stopped at, and carry on. | |
2082 | ||
2083 | Correction: what the code currently does is delete a | |
2084 | step-resume bp, but it makes no effort to ensure that | |
2085 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2086 | |
488f131b JB |
2087 | if (step_resume_breakpoint == NULL) |
2088 | { | |
2089 | step_resume_breakpoint = | |
2090 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2091 | } | |
2092 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
2093 | break; | |
2094 | ||
2095 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
2096 | if (through_sigtramp_breakpoint) | |
2097 | delete_breakpoint (through_sigtramp_breakpoint); | |
2098 | through_sigtramp_breakpoint = NULL; | |
2099 | ||
2100 | /* If were waiting for a trap, hitting the step_resume_break | |
2101 | doesn't count as getting it. */ | |
2102 | if (trap_expected) | |
2103 | ecs->another_trap = 1; | |
2104 | break; | |
2105 | ||
2106 | case BPSTAT_WHAT_CHECK_SHLIBS: | |
2107 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2108 | #ifdef SOLIB_ADD | |
c906108c | 2109 | { |
488f131b JB |
2110 | /* Remove breakpoints, we eventually want to step over the |
2111 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2112 | breakpoint addresses via breakpoint_re_set. */ | |
2113 | if (breakpoints_inserted) | |
2114 | remove_breakpoints (); | |
c5aa993b | 2115 | breakpoints_inserted = 0; |
488f131b JB |
2116 | |
2117 | /* Check for any newly added shared libraries if we're | |
2118 | supposed to be adding them automatically. Switch | |
2119 | terminal for any messages produced by | |
2120 | breakpoint_re_set. */ | |
2121 | target_terminal_ours_for_output (); | |
2122 | SOLIB_ADD (NULL, 0, NULL, auto_solib_add); | |
2123 | target_terminal_inferior (); | |
2124 | ||
2125 | /* Try to reenable shared library breakpoints, additional | |
2126 | code segments in shared libraries might be mapped in now. */ | |
2127 | re_enable_breakpoints_in_shlibs (); | |
2128 | ||
2129 | /* If requested, stop when the dynamic linker notifies | |
2130 | gdb of events. This allows the user to get control | |
2131 | and place breakpoints in initializer routines for | |
2132 | dynamically loaded objects (among other things). */ | |
2133 | if (stop_on_solib_events) | |
d4f3574e | 2134 | { |
488f131b | 2135 | stop_stepping (ecs); |
d4f3574e SS |
2136 | return; |
2137 | } | |
c5aa993b | 2138 | |
488f131b JB |
2139 | /* If we stopped due to an explicit catchpoint, then the |
2140 | (see above) call to SOLIB_ADD pulled in any symbols | |
2141 | from a newly-loaded library, if appropriate. | |
2142 | ||
2143 | We do want the inferior to stop, but not where it is | |
2144 | now, which is in the dynamic linker callback. Rather, | |
2145 | we would like it stop in the user's program, just after | |
2146 | the call that caused this catchpoint to trigger. That | |
2147 | gives the user a more useful vantage from which to | |
2148 | examine their program's state. */ | |
2149 | else if (what.main_action == | |
2150 | BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
c906108c | 2151 | { |
488f131b JB |
2152 | /* ??rehrauer: If I could figure out how to get the |
2153 | right return PC from here, we could just set a temp | |
2154 | breakpoint and resume. I'm not sure we can without | |
2155 | cracking open the dld's shared libraries and sniffing | |
2156 | their unwind tables and text/data ranges, and that's | |
2157 | not a terribly portable notion. | |
2158 | ||
2159 | Until that time, we must step the inferior out of the | |
2160 | dld callback, and also out of the dld itself (and any | |
2161 | code or stubs in libdld.sl, such as "shl_load" and | |
2162 | friends) until we reach non-dld code. At that point, | |
2163 | we can stop stepping. */ | |
2164 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2165 | &ecs-> | |
2166 | stepping_through_solib_catchpoints); | |
2167 | ecs->stepping_through_solib_after_catch = 1; | |
2168 | ||
2169 | /* Be sure to lift all breakpoints, so the inferior does | |
2170 | actually step past this point... */ | |
2171 | ecs->another_trap = 1; | |
2172 | break; | |
c906108c | 2173 | } |
c5aa993b | 2174 | else |
c5aa993b | 2175 | { |
488f131b | 2176 | /* We want to step over this breakpoint, then keep going. */ |
c5aa993b | 2177 | ecs->another_trap = 1; |
488f131b | 2178 | break; |
c5aa993b | 2179 | } |
488f131b JB |
2180 | } |
2181 | #endif | |
2182 | break; | |
c906108c | 2183 | |
488f131b JB |
2184 | case BPSTAT_WHAT_LAST: |
2185 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2186 | |
488f131b JB |
2187 | case BPSTAT_WHAT_KEEP_CHECKING: |
2188 | break; | |
2189 | } | |
2190 | } | |
c906108c | 2191 | |
488f131b JB |
2192 | /* We come here if we hit a breakpoint but should not |
2193 | stop for it. Possibly we also were stepping | |
2194 | and should stop for that. So fall through and | |
2195 | test for stepping. But, if not stepping, | |
2196 | do not stop. */ | |
c906108c | 2197 | |
488f131b JB |
2198 | /* Are we stepping to get the inferior out of the dynamic |
2199 | linker's hook (and possibly the dld itself) after catching | |
2200 | a shlib event? */ | |
2201 | if (ecs->stepping_through_solib_after_catch) | |
2202 | { | |
2203 | #if defined(SOLIB_ADD) | |
2204 | /* Have we reached our destination? If not, keep going. */ | |
2205 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2206 | { | |
2207 | ecs->another_trap = 1; | |
2208 | keep_going (ecs); | |
104c1213 | 2209 | return; |
488f131b JB |
2210 | } |
2211 | #endif | |
2212 | /* Else, stop and report the catchpoint(s) whose triggering | |
2213 | caused us to begin stepping. */ | |
2214 | ecs->stepping_through_solib_after_catch = 0; | |
2215 | bpstat_clear (&stop_bpstat); | |
2216 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2217 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2218 | stop_print_frame = 1; | |
2219 | stop_stepping (ecs); | |
2220 | return; | |
2221 | } | |
c906108c | 2222 | |
488f131b JB |
2223 | if (step_resume_breakpoint) |
2224 | { | |
2225 | /* Having a step-resume breakpoint overrides anything | |
2226 | else having to do with stepping commands until | |
2227 | that breakpoint is reached. */ | |
2228 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2229 | whether it could/should be keep_going. */ | |
2230 | check_sigtramp2 (ecs); | |
2231 | keep_going (ecs); | |
2232 | return; | |
2233 | } | |
c5aa993b | 2234 | |
488f131b JB |
2235 | if (step_range_end == 0) |
2236 | { | |
2237 | /* Likewise if we aren't even stepping. */ | |
2238 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2239 | whether it could/should be keep_going. */ | |
2240 | check_sigtramp2 (ecs); | |
2241 | keep_going (ecs); | |
2242 | return; | |
2243 | } | |
c5aa993b | 2244 | |
488f131b | 2245 | /* If stepping through a line, keep going if still within it. |
c906108c | 2246 | |
488f131b JB |
2247 | Note that step_range_end is the address of the first instruction |
2248 | beyond the step range, and NOT the address of the last instruction | |
2249 | within it! */ | |
2250 | if (stop_pc >= step_range_start && stop_pc < step_range_end) | |
2251 | { | |
2252 | /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal. | |
2253 | So definately need to check for sigtramp here. */ | |
2254 | check_sigtramp2 (ecs); | |
2255 | keep_going (ecs); | |
2256 | return; | |
2257 | } | |
c5aa993b | 2258 | |
488f131b | 2259 | /* We stepped out of the stepping range. */ |
c906108c | 2260 | |
488f131b JB |
2261 | /* If we are stepping at the source level and entered the runtime |
2262 | loader dynamic symbol resolution code, we keep on single stepping | |
2263 | until we exit the run time loader code and reach the callee's | |
2264 | address. */ | |
2265 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2266 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) | |
2267 | { | |
2268 | CORE_ADDR pc_after_resolver = SKIP_SOLIB_RESOLVER (stop_pc); | |
c906108c | 2269 | |
488f131b JB |
2270 | if (pc_after_resolver) |
2271 | { | |
2272 | /* Set up a step-resume breakpoint at the address | |
2273 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2274 | struct symtab_and_line sr_sal; | |
fe39c653 | 2275 | init_sal (&sr_sal); |
488f131b JB |
2276 | sr_sal.pc = pc_after_resolver; |
2277 | ||
2278 | check_for_old_step_resume_breakpoint (); | |
2279 | step_resume_breakpoint = | |
818dd999 | 2280 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
488f131b JB |
2281 | if (breakpoints_inserted) |
2282 | insert_breakpoints (); | |
c5aa993b | 2283 | } |
c906108c | 2284 | |
488f131b JB |
2285 | keep_going (ecs); |
2286 | return; | |
2287 | } | |
c906108c | 2288 | |
488f131b JB |
2289 | /* We can't update step_sp every time through the loop, because |
2290 | reading the stack pointer would slow down stepping too much. | |
2291 | But we can update it every time we leave the step range. */ | |
2292 | ecs->update_step_sp = 1; | |
c906108c | 2293 | |
488f131b | 2294 | /* Did we just take a signal? */ |
0ce3d317 AC |
2295 | if (pc_in_sigtramp (stop_pc) |
2296 | && !pc_in_sigtramp (prev_pc) | |
488f131b JB |
2297 | && INNER_THAN (read_sp (), step_sp)) |
2298 | { | |
2299 | /* We've just taken a signal; go until we are back to | |
2300 | the point where we took it and one more. */ | |
c906108c | 2301 | |
488f131b JB |
2302 | /* Note: The test above succeeds not only when we stepped |
2303 | into a signal handler, but also when we step past the last | |
2304 | statement of a signal handler and end up in the return stub | |
2305 | of the signal handler trampoline. To distinguish between | |
2306 | these two cases, check that the frame is INNER_THAN the | |
2307 | previous one below. pai/1997-09-11 */ | |
c5aa993b | 2308 | |
c5aa993b | 2309 | |
c5aa993b | 2310 | { |
aa0cd9c1 | 2311 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
c906108c | 2312 | |
aa0cd9c1 | 2313 | if (frame_id_inner (current_frame, step_frame_id)) |
488f131b JB |
2314 | { |
2315 | /* We have just taken a signal; go until we are back to | |
2316 | the point where we took it and one more. */ | |
c906108c | 2317 | |
488f131b JB |
2318 | /* This code is needed at least in the following case: |
2319 | The user types "next" and then a signal arrives (before | |
2320 | the "next" is done). */ | |
d4f3574e | 2321 | |
488f131b JB |
2322 | /* Note that if we are stopped at a breakpoint, then we need |
2323 | the step_resume breakpoint to override any breakpoints at | |
2324 | the same location, so that we will still step over the | |
2325 | breakpoint even though the signal happened. */ | |
d4f3574e | 2326 | struct symtab_and_line sr_sal; |
d4f3574e | 2327 | |
fe39c653 | 2328 | init_sal (&sr_sal); |
488f131b JB |
2329 | sr_sal.symtab = NULL; |
2330 | sr_sal.line = 0; | |
2331 | sr_sal.pc = prev_pc; | |
2332 | /* We could probably be setting the frame to | |
aa0cd9c1 | 2333 | step_frame_id; I don't think anyone thought to try it. */ |
d4f3574e SS |
2334 | check_for_old_step_resume_breakpoint (); |
2335 | step_resume_breakpoint = | |
818dd999 | 2336 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
d4f3574e SS |
2337 | if (breakpoints_inserted) |
2338 | insert_breakpoints (); | |
2339 | } | |
488f131b JB |
2340 | else |
2341 | { | |
2342 | /* We just stepped out of a signal handler and into | |
2343 | its calling trampoline. | |
2344 | ||
2345 | Normally, we'd call step_over_function from | |
2346 | here, but for some reason GDB can't unwind the | |
2347 | stack correctly to find the real PC for the point | |
2348 | user code where the signal trampoline will return | |
2349 | -- FRAME_SAVED_PC fails, at least on HP-UX 10.20. | |
2350 | But signal trampolines are pretty small stubs of | |
2351 | code, anyway, so it's OK instead to just | |
2352 | single-step out. Note: assuming such trampolines | |
2353 | don't exhibit recursion on any platform... */ | |
2354 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
2355 | &ecs->stop_func_start, | |
2356 | &ecs->stop_func_end); | |
2357 | /* Readjust stepping range */ | |
2358 | step_range_start = ecs->stop_func_start; | |
2359 | step_range_end = ecs->stop_func_end; | |
2360 | ecs->stepping_through_sigtramp = 1; | |
2361 | } | |
d4f3574e | 2362 | } |
c906108c | 2363 | |
c906108c | 2364 | |
488f131b JB |
2365 | /* If this is stepi or nexti, make sure that the stepping range |
2366 | gets us past that instruction. */ | |
2367 | if (step_range_end == 1) | |
2368 | /* FIXME: Does this run afoul of the code below which, if | |
2369 | we step into the middle of a line, resets the stepping | |
2370 | range? */ | |
2371 | step_range_end = (step_range_start = prev_pc) + 1; | |
2372 | ||
2373 | ecs->remove_breakpoints_on_following_step = 1; | |
2374 | keep_going (ecs); | |
2375 | return; | |
2376 | } | |
c906108c | 2377 | |
488f131b JB |
2378 | if (stop_pc == ecs->stop_func_start /* Quick test */ |
2379 | || (in_prologue (stop_pc, ecs->stop_func_start) && | |
2380 | !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2381 | || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name) | |
2382 | || ecs->stop_func_name == 0) | |
2383 | { | |
2384 | /* It's a subroutine call. */ | |
c906108c | 2385 | |
488f131b JB |
2386 | if ((step_over_calls == STEP_OVER_NONE) |
2387 | || ((step_range_end == 1) | |
2388 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
2389 | { | |
2390 | /* I presume that step_over_calls is only 0 when we're | |
2391 | supposed to be stepping at the assembly language level | |
2392 | ("stepi"). Just stop. */ | |
2393 | /* Also, maybe we just did a "nexti" inside a prolog, | |
2394 | so we thought it was a subroutine call but it was not. | |
2395 | Stop as well. FENN */ | |
2396 | stop_step = 1; | |
2397 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2398 | stop_stepping (ecs); | |
2399 | return; | |
2400 | } | |
c906108c | 2401 | |
488f131b | 2402 | if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc)) |
c5aa993b | 2403 | { |
488f131b JB |
2404 | /* We're doing a "next". */ |
2405 | ||
0ce3d317 | 2406 | if (pc_in_sigtramp (stop_pc) |
aa0cd9c1 AC |
2407 | && frame_id_inner (step_frame_id, |
2408 | frame_id_build (read_sp (), 0))) | |
488f131b JB |
2409 | /* We stepped out of a signal handler, and into its |
2410 | calling trampoline. This is misdetected as a | |
2411 | subroutine call, but stepping over the signal | |
aa0cd9c1 AC |
2412 | trampoline isn't such a bad idea. In order to do that, |
2413 | we have to ignore the value in step_frame_id, since | |
2414 | that doesn't represent the frame that'll reach when we | |
2415 | return from the signal trampoline. Otherwise we'll | |
2416 | probably continue to the end of the program. */ | |
2417 | step_frame_id = null_frame_id; | |
488f131b JB |
2418 | |
2419 | step_over_function (ecs); | |
2420 | keep_going (ecs); | |
2421 | return; | |
2422 | } | |
c906108c | 2423 | |
488f131b JB |
2424 | /* If we are in a function call trampoline (a stub between |
2425 | the calling routine and the real function), locate the real | |
2426 | function. That's what tells us (a) whether we want to step | |
2427 | into it at all, and (b) what prologue we want to run to | |
2428 | the end of, if we do step into it. */ | |
f636b87d AF |
2429 | real_stop_pc = skip_language_trampoline (stop_pc); |
2430 | if (real_stop_pc == 0) | |
2431 | real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); | |
d764a824 AF |
2432 | if (real_stop_pc != 0) |
2433 | ecs->stop_func_start = real_stop_pc; | |
c906108c | 2434 | |
488f131b JB |
2435 | /* If we have line number information for the function we |
2436 | are thinking of stepping into, step into it. | |
c906108c | 2437 | |
488f131b JB |
2438 | If there are several symtabs at that PC (e.g. with include |
2439 | files), just want to know whether *any* of them have line | |
2440 | numbers. find_pc_line handles this. */ | |
c5aa993b | 2441 | { |
488f131b | 2442 | struct symtab_and_line tmp_sal; |
c906108c | 2443 | |
488f131b JB |
2444 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2445 | if (tmp_sal.line != 0) | |
d4f3574e | 2446 | { |
488f131b | 2447 | step_into_function (ecs); |
d4f3574e SS |
2448 | return; |
2449 | } | |
488f131b | 2450 | } |
c5aa993b | 2451 | |
488f131b JB |
2452 | /* If we have no line number and the step-stop-if-no-debug |
2453 | is set, we stop the step so that the user has a chance to | |
2454 | switch in assembly mode. */ | |
2455 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) | |
c5aa993b | 2456 | { |
488f131b JB |
2457 | stop_step = 1; |
2458 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2459 | stop_stepping (ecs); | |
2460 | return; | |
c906108c | 2461 | } |
5fbbeb29 | 2462 | |
488f131b JB |
2463 | step_over_function (ecs); |
2464 | keep_going (ecs); | |
2465 | return; | |
c906108c | 2466 | |
488f131b | 2467 | } |
c906108c | 2468 | |
488f131b | 2469 | /* We've wandered out of the step range. */ |
c906108c | 2470 | |
488f131b | 2471 | ecs->sal = find_pc_line (stop_pc, 0); |
c906108c | 2472 | |
488f131b JB |
2473 | if (step_range_end == 1) |
2474 | { | |
2475 | /* It is stepi or nexti. We always want to stop stepping after | |
2476 | one instruction. */ | |
2477 | stop_step = 1; | |
2478 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2479 | stop_stepping (ecs); | |
2480 | return; | |
2481 | } | |
c906108c | 2482 | |
488f131b JB |
2483 | /* If we're in the return path from a shared library trampoline, |
2484 | we want to proceed through the trampoline when stepping. */ | |
2485 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2486 | { | |
488f131b | 2487 | /* Determine where this trampoline returns. */ |
d764a824 | 2488 | real_stop_pc = SKIP_TRAMPOLINE_CODE (stop_pc); |
c906108c | 2489 | |
488f131b | 2490 | /* Only proceed through if we know where it's going. */ |
d764a824 | 2491 | if (real_stop_pc) |
488f131b JB |
2492 | { |
2493 | /* And put the step-breakpoint there and go until there. */ | |
2494 | struct symtab_and_line sr_sal; | |
2495 | ||
fe39c653 | 2496 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 2497 | sr_sal.pc = real_stop_pc; |
488f131b JB |
2498 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2499 | /* Do not specify what the fp should be when we stop | |
2500 | since on some machines the prologue | |
2501 | is where the new fp value is established. */ | |
2502 | check_for_old_step_resume_breakpoint (); | |
2503 | step_resume_breakpoint = | |
818dd999 | 2504 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
488f131b JB |
2505 | if (breakpoints_inserted) |
2506 | insert_breakpoints (); | |
c906108c | 2507 | |
488f131b JB |
2508 | /* Restart without fiddling with the step ranges or |
2509 | other state. */ | |
2510 | keep_going (ecs); | |
2511 | return; | |
2512 | } | |
2513 | } | |
c906108c | 2514 | |
488f131b JB |
2515 | if (ecs->sal.line == 0) |
2516 | { | |
2517 | /* We have no line number information. That means to stop | |
2518 | stepping (does this always happen right after one instruction, | |
2519 | when we do "s" in a function with no line numbers, | |
2520 | or can this happen as a result of a return or longjmp?). */ | |
2521 | stop_step = 1; | |
2522 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2523 | stop_stepping (ecs); | |
2524 | return; | |
2525 | } | |
c906108c | 2526 | |
488f131b JB |
2527 | if ((stop_pc == ecs->sal.pc) |
2528 | && (ecs->current_line != ecs->sal.line | |
2529 | || ecs->current_symtab != ecs->sal.symtab)) | |
2530 | { | |
2531 | /* We are at the start of a different line. So stop. Note that | |
2532 | we don't stop if we step into the middle of a different line. | |
2533 | That is said to make things like for (;;) statements work | |
2534 | better. */ | |
2535 | stop_step = 1; | |
2536 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2537 | stop_stepping (ecs); | |
2538 | return; | |
2539 | } | |
c906108c | 2540 | |
488f131b | 2541 | /* We aren't done stepping. |
c906108c | 2542 | |
488f131b JB |
2543 | Optimize by setting the stepping range to the line. |
2544 | (We might not be in the original line, but if we entered a | |
2545 | new line in mid-statement, we continue stepping. This makes | |
2546 | things like for(;;) statements work better.) */ | |
c906108c | 2547 | |
488f131b | 2548 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
c5aa993b | 2549 | { |
488f131b JB |
2550 | /* If this is the last line of the function, don't keep stepping |
2551 | (it would probably step us out of the function). | |
2552 | This is particularly necessary for a one-line function, | |
2553 | in which after skipping the prologue we better stop even though | |
2554 | we will be in mid-line. */ | |
2555 | stop_step = 1; | |
2556 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2557 | stop_stepping (ecs); | |
2558 | return; | |
c5aa993b | 2559 | } |
488f131b JB |
2560 | step_range_start = ecs->sal.pc; |
2561 | step_range_end = ecs->sal.end; | |
aa0cd9c1 | 2562 | step_frame_id = get_frame_id (get_current_frame ()); |
488f131b JB |
2563 | ecs->current_line = ecs->sal.line; |
2564 | ecs->current_symtab = ecs->sal.symtab; | |
2565 | ||
aa0cd9c1 AC |
2566 | /* In the case where we just stepped out of a function into the |
2567 | middle of a line of the caller, continue stepping, but | |
2568 | step_frame_id must be modified to current frame */ | |
488f131b | 2569 | { |
aa0cd9c1 AC |
2570 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
2571 | if (!(frame_id_inner (current_frame, step_frame_id))) | |
2572 | step_frame_id = current_frame; | |
488f131b | 2573 | } |
c906108c | 2574 | |
488f131b | 2575 | keep_going (ecs); |
104c1213 JM |
2576 | } |
2577 | ||
2578 | /* Are we in the middle of stepping? */ | |
2579 | ||
2580 | static int | |
2581 | currently_stepping (struct execution_control_state *ecs) | |
2582 | { | |
2583 | return ((through_sigtramp_breakpoint == NULL | |
2584 | && !ecs->handling_longjmp | |
2585 | && ((step_range_end && step_resume_breakpoint == NULL) | |
2586 | || trap_expected)) | |
2587 | || ecs->stepping_through_solib_after_catch | |
2588 | || bpstat_should_step ()); | |
2589 | } | |
c906108c | 2590 | |
104c1213 JM |
2591 | static void |
2592 | check_sigtramp2 (struct execution_control_state *ecs) | |
2593 | { | |
2594 | if (trap_expected | |
0ce3d317 AC |
2595 | && pc_in_sigtramp (stop_pc) |
2596 | && !pc_in_sigtramp (prev_pc) | |
104c1213 JM |
2597 | && INNER_THAN (read_sp (), step_sp)) |
2598 | { | |
2599 | /* What has happened here is that we have just stepped the | |
488f131b JB |
2600 | inferior with a signal (because it is a signal which |
2601 | shouldn't make us stop), thus stepping into sigtramp. | |
104c1213 | 2602 | |
488f131b JB |
2603 | So we need to set a step_resume_break_address breakpoint and |
2604 | continue until we hit it, and then step. FIXME: This should | |
2605 | be more enduring than a step_resume breakpoint; we should | |
2606 | know that we will later need to keep going rather than | |
2607 | re-hitting the breakpoint here (see the testsuite, | |
2608 | gdb.base/signals.exp where it says "exceedingly difficult"). */ | |
104c1213 JM |
2609 | |
2610 | struct symtab_and_line sr_sal; | |
2611 | ||
fe39c653 | 2612 | init_sal (&sr_sal); /* initialize to zeroes */ |
104c1213 JM |
2613 | sr_sal.pc = prev_pc; |
2614 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2615 | /* We perhaps could set the frame if we kept track of what the | |
488f131b | 2616 | frame corresponding to prev_pc was. But we don't, so don't. */ |
104c1213 | 2617 | through_sigtramp_breakpoint = |
818dd999 | 2618 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_through_sigtramp); |
104c1213 JM |
2619 | if (breakpoints_inserted) |
2620 | insert_breakpoints (); | |
cd0fc7c3 | 2621 | |
104c1213 JM |
2622 | ecs->remove_breakpoints_on_following_step = 1; |
2623 | ecs->another_trap = 1; | |
2624 | } | |
2625 | } | |
2626 | ||
c2c6d25f JM |
2627 | /* Subroutine call with source code we should not step over. Do step |
2628 | to the first line of code in it. */ | |
2629 | ||
2630 | static void | |
2631 | step_into_function (struct execution_control_state *ecs) | |
2632 | { | |
2633 | struct symtab *s; | |
2634 | struct symtab_and_line sr_sal; | |
2635 | ||
2636 | s = find_pc_symtab (stop_pc); | |
2637 | if (s && s->language != language_asm) | |
2638 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
2639 | ||
2640 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2641 | /* Use the step_resume_break to step until the end of the prologue, | |
2642 | even if that involves jumps (as it seems to on the vax under | |
2643 | 4.2). */ | |
2644 | /* If the prologue ends in the middle of a source line, continue to | |
2645 | the end of that source line (if it is still within the function). | |
2646 | Otherwise, just go to end of prologue. */ | |
2647 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP | |
2648 | /* no, don't either. It skips any code that's legitimately on the | |
2649 | first line. */ | |
2650 | #else | |
2651 | if (ecs->sal.end | |
2652 | && ecs->sal.pc != ecs->stop_func_start | |
2653 | && ecs->sal.end < ecs->stop_func_end) | |
2654 | ecs->stop_func_start = ecs->sal.end; | |
2655 | #endif | |
2656 | ||
2657 | if (ecs->stop_func_start == stop_pc) | |
2658 | { | |
2659 | /* We are already there: stop now. */ | |
2660 | stop_step = 1; | |
488f131b | 2661 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2662 | stop_stepping (ecs); |
2663 | return; | |
2664 | } | |
2665 | else | |
2666 | { | |
2667 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 2668 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
2669 | sr_sal.pc = ecs->stop_func_start; |
2670 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
2671 | /* Do not specify what the fp should be when we stop since on | |
488f131b JB |
2672 | some machines the prologue is where the new fp value is |
2673 | established. */ | |
c2c6d25f JM |
2674 | check_for_old_step_resume_breakpoint (); |
2675 | step_resume_breakpoint = | |
818dd999 | 2676 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
c2c6d25f JM |
2677 | if (breakpoints_inserted) |
2678 | insert_breakpoints (); | |
2679 | ||
2680 | /* And make sure stepping stops right away then. */ | |
2681 | step_range_end = step_range_start; | |
2682 | } | |
2683 | keep_going (ecs); | |
2684 | } | |
d4f3574e SS |
2685 | |
2686 | /* We've just entered a callee, and we wish to resume until it returns | |
2687 | to the caller. Setting a step_resume breakpoint on the return | |
2688 | address will catch a return from the callee. | |
2689 | ||
2690 | However, if the callee is recursing, we want to be careful not to | |
2691 | catch returns of those recursive calls, but only of THIS instance | |
2692 | of the call. | |
2693 | ||
2694 | To do this, we set the step_resume bp's frame to our current | |
aa0cd9c1 | 2695 | caller's frame (step_frame_id, which is set by the "next" or |
d4f3574e SS |
2696 | "until" command, before execution begins). */ |
2697 | ||
2698 | static void | |
2699 | step_over_function (struct execution_control_state *ecs) | |
2700 | { | |
2701 | struct symtab_and_line sr_sal; | |
2702 | ||
fe39c653 | 2703 | init_sal (&sr_sal); /* initialize to zeros */ |
4443bd83 AC |
2704 | |
2705 | /* NOTE: cagney/2003-04-06: | |
2706 | ||
2707 | At this point the equality get_frame_pc() == get_frame_func() | |
2708 | should hold. This may make it possible for this code to tell the | |
2709 | frame where it's function is, instead of the reverse. This would | |
2710 | avoid the need to search for the frame's function, which can get | |
2711 | very messy when there is no debug info available (look at the | |
2712 | heuristic find pc start code found in targets like the MIPS). */ | |
2713 | ||
6913c89a | 2714 | /* NOTE: cagney/2003-04-06: |
4443bd83 | 2715 | |
6913c89a | 2716 | The intent of DEPRECATED_SAVED_PC_AFTER_CALL was to: |
4443bd83 AC |
2717 | |
2718 | - provide a very light weight equivalent to frame_unwind_pc() | |
2719 | (nee FRAME_SAVED_PC) that avoids the prologue analyzer | |
2720 | ||
2721 | - avoid handling the case where the PC hasn't been saved in the | |
2722 | prologue analyzer | |
2723 | ||
2724 | Unfortunatly, not five lines further down, is a call to | |
2725 | get_frame_id() and that is guarenteed to trigger the prologue | |
2726 | analyzer. | |
2727 | ||
2728 | The `correct fix' is for the prologe analyzer to handle the case | |
2729 | where the prologue is incomplete (PC in prologue) and, | |
2730 | consequently, the return pc has not yet been saved. It should be | |
2731 | noted that the prologue analyzer needs to handle this case | |
2732 | anyway: frameless leaf functions that don't save the return PC; | |
2733 | single stepping through a prologue. | |
2734 | ||
2735 | The d10v handles all this by bailing out of the prologue analsis | |
2736 | when it reaches the current instruction. */ | |
2737 | ||
6913c89a AC |
2738 | if (DEPRECATED_SAVED_PC_AFTER_CALL_P ()) |
2739 | sr_sal.pc = ADDR_BITS_REMOVE (DEPRECATED_SAVED_PC_AFTER_CALL (get_current_frame ())); | |
4443bd83 AC |
2740 | else |
2741 | sr_sal.pc = ADDR_BITS_REMOVE (frame_pc_unwind (get_current_frame ())); | |
d4f3574e SS |
2742 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
2743 | ||
2744 | check_for_old_step_resume_breakpoint (); | |
2745 | step_resume_breakpoint = | |
818dd999 AC |
2746 | set_momentary_breakpoint (sr_sal, get_frame_id (get_current_frame ()), |
2747 | bp_step_resume); | |
d4f3574e | 2748 | |
aa0cd9c1 AC |
2749 | if (frame_id_p (step_frame_id) |
2750 | && !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc)) | |
818dd999 | 2751 | step_resume_breakpoint->frame_id = step_frame_id; |
d4f3574e SS |
2752 | |
2753 | if (breakpoints_inserted) | |
2754 | insert_breakpoints (); | |
2755 | } | |
2756 | ||
104c1213 JM |
2757 | static void |
2758 | stop_stepping (struct execution_control_state *ecs) | |
2759 | { | |
c906108c SS |
2760 | if (target_has_execution) |
2761 | { | |
c906108c | 2762 | /* Assuming the inferior still exists, set these up for next |
c5aa993b JM |
2763 | time, just like we did above if we didn't break out of the |
2764 | loop. */ | |
c906108c | 2765 | prev_pc = read_pc (); |
c906108c | 2766 | } |
104c1213 | 2767 | |
cd0fc7c3 SS |
2768 | /* Let callers know we don't want to wait for the inferior anymore. */ |
2769 | ecs->wait_some_more = 0; | |
2770 | } | |
2771 | ||
d4f3574e SS |
2772 | /* This function handles various cases where we need to continue |
2773 | waiting for the inferior. */ | |
2774 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
2775 | ||
2776 | static void | |
2777 | keep_going (struct execution_control_state *ecs) | |
2778 | { | |
d4f3574e | 2779 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 2780 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e SS |
2781 | |
2782 | if (ecs->update_step_sp) | |
2783 | step_sp = read_sp (); | |
2784 | ecs->update_step_sp = 0; | |
2785 | ||
2786 | /* If we did not do break;, it means we should keep running the | |
2787 | inferior and not return to debugger. */ | |
2788 | ||
2789 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
2790 | { | |
2791 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
2792 | the inferior, else we'd have done a break above) and we |
2793 | haven't yet gotten our trap. Simply continue. */ | |
d4f3574e SS |
2794 | resume (currently_stepping (ecs), stop_signal); |
2795 | } | |
2796 | else | |
2797 | { | |
2798 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
2799 | anyway (the user asked that this signal be passed to the |
2800 | child) | |
2801 | -- or -- | |
2802 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2803 | decided we should resume from it. | |
d4f3574e | 2804 | |
488f131b | 2805 | We're going to run this baby now! |
d4f3574e | 2806 | |
488f131b JB |
2807 | Insert breakpoints now, unless we are trying to one-proceed |
2808 | past a breakpoint. */ | |
d4f3574e | 2809 | /* If we've just finished a special step resume and we don't |
488f131b | 2810 | want to hit a breakpoint, pull em out. */ |
d4f3574e SS |
2811 | if (step_resume_breakpoint == NULL |
2812 | && through_sigtramp_breakpoint == NULL | |
2813 | && ecs->remove_breakpoints_on_following_step) | |
2814 | { | |
2815 | ecs->remove_breakpoints_on_following_step = 0; | |
2816 | remove_breakpoints (); | |
2817 | breakpoints_inserted = 0; | |
2818 | } | |
2819 | else if (!breakpoints_inserted && | |
2820 | (through_sigtramp_breakpoint != NULL || !ecs->another_trap)) | |
2821 | { | |
2822 | breakpoints_failed = insert_breakpoints (); | |
2823 | if (breakpoints_failed) | |
2824 | { | |
2825 | stop_stepping (ecs); | |
2826 | return; | |
2827 | } | |
2828 | breakpoints_inserted = 1; | |
2829 | } | |
2830 | ||
2831 | trap_expected = ecs->another_trap; | |
2832 | ||
2833 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
2834 | specifies that such a signal should be delivered to the |
2835 | target program). | |
2836 | ||
2837 | Typically, this would occure when a user is debugging a | |
2838 | target monitor on a simulator: the target monitor sets a | |
2839 | breakpoint; the simulator encounters this break-point and | |
2840 | halts the simulation handing control to GDB; GDB, noteing | |
2841 | that the break-point isn't valid, returns control back to the | |
2842 | simulator; the simulator then delivers the hardware | |
2843 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
2844 | ||
2845 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
2846 | stop_signal = TARGET_SIGNAL_0; |
2847 | ||
2848 | #ifdef SHIFT_INST_REGS | |
2849 | /* I'm not sure when this following segment applies. I do know, | |
488f131b JB |
2850 | now, that we shouldn't rewrite the regs when we were stopped |
2851 | by a random signal from the inferior process. */ | |
d4f3574e | 2852 | /* FIXME: Shouldn't this be based on the valid bit of the SXIP? |
488f131b | 2853 | (this is only used on the 88k). */ |
d4f3574e SS |
2854 | |
2855 | if (!bpstat_explains_signal (stop_bpstat) | |
488f131b | 2856 | && (stop_signal != TARGET_SIGNAL_CHLD) && !stopped_by_random_signal) |
d4f3574e SS |
2857 | SHIFT_INST_REGS (); |
2858 | #endif /* SHIFT_INST_REGS */ | |
2859 | ||
2860 | resume (currently_stepping (ecs), stop_signal); | |
2861 | } | |
2862 | ||
488f131b | 2863 | prepare_to_wait (ecs); |
d4f3574e SS |
2864 | } |
2865 | ||
104c1213 JM |
2866 | /* This function normally comes after a resume, before |
2867 | handle_inferior_event exits. It takes care of any last bits of | |
2868 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 2869 | |
104c1213 JM |
2870 | static void |
2871 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 2872 | { |
104c1213 JM |
2873 | if (ecs->infwait_state == infwait_normal_state) |
2874 | { | |
2875 | overlay_cache_invalid = 1; | |
2876 | ||
2877 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
2878 | target_wait because they can be loaded from the target while |
2879 | in target_wait. This makes remote debugging a bit more | |
2880 | efficient for those targets that provide critical registers | |
2881 | as part of their normal status mechanism. */ | |
104c1213 JM |
2882 | |
2883 | registers_changed (); | |
39f77062 | 2884 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
2885 | ecs->wp = &(ecs->ws); |
2886 | } | |
2887 | /* This is the old end of the while loop. Let everybody know we | |
2888 | want to wait for the inferior some more and get called again | |
2889 | soon. */ | |
2890 | ecs->wait_some_more = 1; | |
c906108c | 2891 | } |
11cf8741 JM |
2892 | |
2893 | /* Print why the inferior has stopped. We always print something when | |
2894 | the inferior exits, or receives a signal. The rest of the cases are | |
2895 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
2896 | there should be a call to this function from handle_inferior_event() | |
2897 | each time stop_stepping() is called.*/ | |
2898 | static void | |
2899 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
2900 | { | |
2901 | switch (stop_reason) | |
2902 | { | |
2903 | case STOP_UNKNOWN: | |
2904 | /* We don't deal with these cases from handle_inferior_event() | |
2905 | yet. */ | |
2906 | break; | |
2907 | case END_STEPPING_RANGE: | |
2908 | /* We are done with a step/next/si/ni command. */ | |
2909 | /* For now print nothing. */ | |
fb40c209 | 2910 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 2911 | operation for n > 1 */ |
fb40c209 | 2912 | if (!step_multi || !stop_step) |
9dc5e2a9 | 2913 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2914 | ui_out_field_string (uiout, "reason", "end-stepping-range"); |
11cf8741 JM |
2915 | break; |
2916 | case BREAKPOINT_HIT: | |
2917 | /* We found a breakpoint. */ | |
2918 | /* For now print nothing. */ | |
2919 | break; | |
2920 | case SIGNAL_EXITED: | |
2921 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 2922 | annotate_signalled (); |
9dc5e2a9 | 2923 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2924 | ui_out_field_string (uiout, "reason", "exited-signalled"); |
8b93c638 JM |
2925 | ui_out_text (uiout, "\nProgram terminated with signal "); |
2926 | annotate_signal_name (); | |
488f131b JB |
2927 | ui_out_field_string (uiout, "signal-name", |
2928 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2929 | annotate_signal_name_end (); |
2930 | ui_out_text (uiout, ", "); | |
2931 | annotate_signal_string (); | |
488f131b JB |
2932 | ui_out_field_string (uiout, "signal-meaning", |
2933 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2934 | annotate_signal_string_end (); |
2935 | ui_out_text (uiout, ".\n"); | |
2936 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
2937 | break; |
2938 | case EXITED: | |
2939 | /* The inferior program is finished. */ | |
8b93c638 JM |
2940 | annotate_exited (stop_info); |
2941 | if (stop_info) | |
2942 | { | |
9dc5e2a9 | 2943 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2944 | ui_out_field_string (uiout, "reason", "exited"); |
8b93c638 | 2945 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
2946 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
2947 | (unsigned int) stop_info); | |
8b93c638 JM |
2948 | ui_out_text (uiout, ".\n"); |
2949 | } | |
2950 | else | |
2951 | { | |
9dc5e2a9 | 2952 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2953 | ui_out_field_string (uiout, "reason", "exited-normally"); |
8b93c638 JM |
2954 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
2955 | } | |
11cf8741 JM |
2956 | break; |
2957 | case SIGNAL_RECEIVED: | |
2958 | /* Signal received. The signal table tells us to print about | |
2959 | it. */ | |
8b93c638 JM |
2960 | annotate_signal (); |
2961 | ui_out_text (uiout, "\nProgram received signal "); | |
2962 | annotate_signal_name (); | |
84c6c83c KS |
2963 | if (ui_out_is_mi_like_p (uiout)) |
2964 | ui_out_field_string (uiout, "reason", "signal-received"); | |
488f131b JB |
2965 | ui_out_field_string (uiout, "signal-name", |
2966 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2967 | annotate_signal_name_end (); |
2968 | ui_out_text (uiout, ", "); | |
2969 | annotate_signal_string (); | |
488f131b JB |
2970 | ui_out_field_string (uiout, "signal-meaning", |
2971 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2972 | annotate_signal_string_end (); |
2973 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
2974 | break; |
2975 | default: | |
8e65ff28 AC |
2976 | internal_error (__FILE__, __LINE__, |
2977 | "print_stop_reason: unrecognized enum value"); | |
11cf8741 JM |
2978 | break; |
2979 | } | |
2980 | } | |
c906108c | 2981 | \f |
43ff13b4 | 2982 | |
c906108c SS |
2983 | /* Here to return control to GDB when the inferior stops for real. |
2984 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
2985 | ||
2986 | STOP_PRINT_FRAME nonzero means print the executing frame | |
2987 | (pc, function, args, file, line number and line text). | |
2988 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
2989 | attempting to insert breakpoints. */ | |
2990 | ||
2991 | void | |
96baa820 | 2992 | normal_stop (void) |
c906108c | 2993 | { |
c906108c SS |
2994 | /* As with the notification of thread events, we want to delay |
2995 | notifying the user that we've switched thread context until | |
2996 | the inferior actually stops. | |
2997 | ||
2998 | (Note that there's no point in saying anything if the inferior | |
2999 | has exited!) */ | |
488f131b | 3000 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
7a292a7a | 3001 | && target_has_execution) |
c906108c SS |
3002 | { |
3003 | target_terminal_ours_for_output (); | |
c3f6f71d | 3004 | printf_filtered ("[Switching to %s]\n", |
39f77062 KB |
3005 | target_pid_or_tid_to_str (inferior_ptid)); |
3006 | previous_inferior_ptid = inferior_ptid; | |
c906108c | 3007 | } |
c906108c SS |
3008 | |
3009 | /* Make sure that the current_frame's pc is correct. This | |
3010 | is a correction for setting up the frame info before doing | |
3011 | DECR_PC_AFTER_BREAK */ | |
b87efeee AC |
3012 | if (target_has_execution) |
3013 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to | |
3014 | DECR_PC_AFTER_BREAK, the program counter can change. Ask the | |
3015 | frame code to check for this and sort out any resultant mess. | |
3016 | DECR_PC_AFTER_BREAK needs to just go away. */ | |
2f107107 | 3017 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
c906108c | 3018 | |
c906108c SS |
3019 | if (target_has_execution && breakpoints_inserted) |
3020 | { | |
3021 | if (remove_breakpoints ()) | |
3022 | { | |
3023 | target_terminal_ours_for_output (); | |
3024 | printf_filtered ("Cannot remove breakpoints because "); | |
3025 | printf_filtered ("program is no longer writable.\n"); | |
3026 | printf_filtered ("It might be running in another process.\n"); | |
3027 | printf_filtered ("Further execution is probably impossible.\n"); | |
3028 | } | |
3029 | } | |
3030 | breakpoints_inserted = 0; | |
3031 | ||
3032 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3033 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3034 | ||
3035 | breakpoint_auto_delete (stop_bpstat); | |
3036 | ||
3037 | /* If an auto-display called a function and that got a signal, | |
3038 | delete that auto-display to avoid an infinite recursion. */ | |
3039 | ||
3040 | if (stopped_by_random_signal) | |
3041 | disable_current_display (); | |
3042 | ||
3043 | /* Don't print a message if in the middle of doing a "step n" | |
3044 | operation for n > 1 */ | |
3045 | if (step_multi && stop_step) | |
3046 | goto done; | |
3047 | ||
3048 | target_terminal_ours (); | |
3049 | ||
5913bcb0 AC |
3050 | /* Look up the hook_stop and run it (CLI internally handles problem |
3051 | of stop_command's pre-hook not existing). */ | |
3052 | if (stop_command) | |
3053 | catch_errors (hook_stop_stub, stop_command, | |
3054 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
3055 | |
3056 | if (!target_has_stack) | |
3057 | { | |
3058 | ||
3059 | goto done; | |
3060 | } | |
3061 | ||
3062 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3063 | and current location is based on that. | |
3064 | Don't do this on return from a stack dummy routine, | |
3065 | or if the program has exited. */ | |
3066 | ||
3067 | if (!stop_stack_dummy) | |
3068 | { | |
0f7d239c | 3069 | select_frame (get_current_frame ()); |
c906108c SS |
3070 | |
3071 | /* Print current location without a level number, if | |
c5aa993b JM |
3072 | we have changed functions or hit a breakpoint. |
3073 | Print source line if we have one. | |
3074 | bpstat_print() contains the logic deciding in detail | |
3075 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3076 | |
6e7f8b9c | 3077 | if (stop_print_frame && deprecated_selected_frame) |
c906108c SS |
3078 | { |
3079 | int bpstat_ret; | |
3080 | int source_flag; | |
917317f4 | 3081 | int do_frame_printing = 1; |
c906108c SS |
3082 | |
3083 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3084 | switch (bpstat_ret) |
3085 | { | |
3086 | case PRINT_UNKNOWN: | |
aa0cd9c1 AC |
3087 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
3088 | (or should) carry around the function and does (or | |
3089 | should) use that when doing a frame comparison. */ | |
917317f4 | 3090 | if (stop_step |
aa0cd9c1 AC |
3091 | && frame_id_eq (step_frame_id, |
3092 | get_frame_id (get_current_frame ())) | |
917317f4 | 3093 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3094 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3095 | else |
488f131b | 3096 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3097 | break; |
3098 | case PRINT_SRC_AND_LOC: | |
488f131b | 3099 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3100 | break; |
3101 | case PRINT_SRC_ONLY: | |
c5394b80 | 3102 | source_flag = SRC_LINE; |
917317f4 JM |
3103 | break; |
3104 | case PRINT_NOTHING: | |
488f131b | 3105 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3106 | do_frame_printing = 0; |
3107 | break; | |
3108 | default: | |
488f131b | 3109 | internal_error (__FILE__, __LINE__, "Unknown value."); |
917317f4 | 3110 | } |
fb40c209 | 3111 | /* For mi, have the same behavior every time we stop: |
488f131b | 3112 | print everything but the source line. */ |
9dc5e2a9 | 3113 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3114 | source_flag = LOC_AND_ADDRESS; |
c906108c | 3115 | |
9dc5e2a9 | 3116 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 | 3117 | ui_out_field_int (uiout, "thread-id", |
488f131b | 3118 | pid_to_thread_id (inferior_ptid)); |
c906108c SS |
3119 | /* The behavior of this routine with respect to the source |
3120 | flag is: | |
c5394b80 JM |
3121 | SRC_LINE: Print only source line |
3122 | LOCATION: Print only location | |
3123 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3124 | if (do_frame_printing) |
7789c6f5 | 3125 | print_stack_frame (deprecated_selected_frame, -1, source_flag); |
c906108c SS |
3126 | |
3127 | /* Display the auto-display expressions. */ | |
3128 | do_displays (); | |
3129 | } | |
3130 | } | |
3131 | ||
3132 | /* Save the function value return registers, if we care. | |
3133 | We might be about to restore their previous contents. */ | |
3134 | if (proceed_to_finish) | |
72cec141 AC |
3135 | /* NB: The copy goes through to the target picking up the value of |
3136 | all the registers. */ | |
3137 | regcache_cpy (stop_registers, current_regcache); | |
c906108c SS |
3138 | |
3139 | if (stop_stack_dummy) | |
3140 | { | |
dbe9fe58 AC |
3141 | /* Pop the empty frame that contains the stack dummy. POP_FRAME |
3142 | ends with a setting of the current frame, so we can use that | |
3143 | next. */ | |
3144 | frame_pop (get_current_frame ()); | |
c906108c | 3145 | /* Set stop_pc to what it was before we called the function. |
c5aa993b JM |
3146 | Can't rely on restore_inferior_status because that only gets |
3147 | called if we don't stop in the called function. */ | |
c906108c | 3148 | stop_pc = read_pc (); |
0f7d239c | 3149 | select_frame (get_current_frame ()); |
c906108c SS |
3150 | } |
3151 | ||
c906108c SS |
3152 | done: |
3153 | annotate_stopped (); | |
06600e06 | 3154 | observer_notify_normal_stop (); |
c906108c SS |
3155 | } |
3156 | ||
3157 | static int | |
96baa820 | 3158 | hook_stop_stub (void *cmd) |
c906108c | 3159 | { |
5913bcb0 | 3160 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3161 | return (0); |
3162 | } | |
3163 | \f | |
c5aa993b | 3164 | int |
96baa820 | 3165 | signal_stop_state (int signo) |
c906108c SS |
3166 | { |
3167 | return signal_stop[signo]; | |
3168 | } | |
3169 | ||
c5aa993b | 3170 | int |
96baa820 | 3171 | signal_print_state (int signo) |
c906108c SS |
3172 | { |
3173 | return signal_print[signo]; | |
3174 | } | |
3175 | ||
c5aa993b | 3176 | int |
96baa820 | 3177 | signal_pass_state (int signo) |
c906108c SS |
3178 | { |
3179 | return signal_program[signo]; | |
3180 | } | |
3181 | ||
488f131b | 3182 | int |
7bda5e4a | 3183 | signal_stop_update (int signo, int state) |
d4f3574e SS |
3184 | { |
3185 | int ret = signal_stop[signo]; | |
3186 | signal_stop[signo] = state; | |
3187 | return ret; | |
3188 | } | |
3189 | ||
488f131b | 3190 | int |
7bda5e4a | 3191 | signal_print_update (int signo, int state) |
d4f3574e SS |
3192 | { |
3193 | int ret = signal_print[signo]; | |
3194 | signal_print[signo] = state; | |
3195 | return ret; | |
3196 | } | |
3197 | ||
488f131b | 3198 | int |
7bda5e4a | 3199 | signal_pass_update (int signo, int state) |
d4f3574e SS |
3200 | { |
3201 | int ret = signal_program[signo]; | |
3202 | signal_program[signo] = state; | |
3203 | return ret; | |
3204 | } | |
3205 | ||
c906108c | 3206 | static void |
96baa820 | 3207 | sig_print_header (void) |
c906108c SS |
3208 | { |
3209 | printf_filtered ("\ | |
3210 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3211 | } | |
3212 | ||
3213 | static void | |
96baa820 | 3214 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3215 | { |
3216 | char *name = target_signal_to_name (oursig); | |
3217 | int name_padding = 13 - strlen (name); | |
96baa820 | 3218 | |
c906108c SS |
3219 | if (name_padding <= 0) |
3220 | name_padding = 0; | |
3221 | ||
3222 | printf_filtered ("%s", name); | |
488f131b | 3223 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
3224 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3225 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3226 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3227 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3228 | } | |
3229 | ||
3230 | /* Specify how various signals in the inferior should be handled. */ | |
3231 | ||
3232 | static void | |
96baa820 | 3233 | handle_command (char *args, int from_tty) |
c906108c SS |
3234 | { |
3235 | char **argv; | |
3236 | int digits, wordlen; | |
3237 | int sigfirst, signum, siglast; | |
3238 | enum target_signal oursig; | |
3239 | int allsigs; | |
3240 | int nsigs; | |
3241 | unsigned char *sigs; | |
3242 | struct cleanup *old_chain; | |
3243 | ||
3244 | if (args == NULL) | |
3245 | { | |
3246 | error_no_arg ("signal to handle"); | |
3247 | } | |
3248 | ||
3249 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3250 | ||
3251 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3252 | sigs = (unsigned char *) alloca (nsigs); | |
3253 | memset (sigs, 0, nsigs); | |
3254 | ||
3255 | /* Break the command line up into args. */ | |
3256 | ||
3257 | argv = buildargv (args); | |
3258 | if (argv == NULL) | |
3259 | { | |
3260 | nomem (0); | |
3261 | } | |
7a292a7a | 3262 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3263 | |
3264 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3265 | actions. Signal numbers and signal names may be interspersed with | |
3266 | actions, with the actions being performed for all signals cumulatively | |
3267 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3268 | ||
3269 | while (*argv != NULL) | |
3270 | { | |
3271 | wordlen = strlen (*argv); | |
3272 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3273 | {; | |
3274 | } | |
3275 | allsigs = 0; | |
3276 | sigfirst = siglast = -1; | |
3277 | ||
3278 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3279 | { | |
3280 | /* Apply action to all signals except those used by the | |
3281 | debugger. Silently skip those. */ | |
3282 | allsigs = 1; | |
3283 | sigfirst = 0; | |
3284 | siglast = nsigs - 1; | |
3285 | } | |
3286 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3287 | { | |
3288 | SET_SIGS (nsigs, sigs, signal_stop); | |
3289 | SET_SIGS (nsigs, sigs, signal_print); | |
3290 | } | |
3291 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3292 | { | |
3293 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3294 | } | |
3295 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3296 | { | |
3297 | SET_SIGS (nsigs, sigs, signal_print); | |
3298 | } | |
3299 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3300 | { | |
3301 | SET_SIGS (nsigs, sigs, signal_program); | |
3302 | } | |
3303 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3304 | { | |
3305 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3306 | } | |
3307 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3308 | { | |
3309 | SET_SIGS (nsigs, sigs, signal_program); | |
3310 | } | |
3311 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3312 | { | |
3313 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3314 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3315 | } | |
3316 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3317 | { | |
3318 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3319 | } | |
3320 | else if (digits > 0) | |
3321 | { | |
3322 | /* It is numeric. The numeric signal refers to our own | |
3323 | internal signal numbering from target.h, not to host/target | |
3324 | signal number. This is a feature; users really should be | |
3325 | using symbolic names anyway, and the common ones like | |
3326 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3327 | ||
3328 | sigfirst = siglast = (int) | |
3329 | target_signal_from_command (atoi (*argv)); | |
3330 | if ((*argv)[digits] == '-') | |
3331 | { | |
3332 | siglast = (int) | |
3333 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3334 | } | |
3335 | if (sigfirst > siglast) | |
3336 | { | |
3337 | /* Bet he didn't figure we'd think of this case... */ | |
3338 | signum = sigfirst; | |
3339 | sigfirst = siglast; | |
3340 | siglast = signum; | |
3341 | } | |
3342 | } | |
3343 | else | |
3344 | { | |
3345 | oursig = target_signal_from_name (*argv); | |
3346 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3347 | { | |
3348 | sigfirst = siglast = (int) oursig; | |
3349 | } | |
3350 | else | |
3351 | { | |
3352 | /* Not a number and not a recognized flag word => complain. */ | |
3353 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3354 | } | |
3355 | } | |
3356 | ||
3357 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3358 | which signals to apply actions to. */ |
c906108c SS |
3359 | |
3360 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3361 | { | |
3362 | switch ((enum target_signal) signum) | |
3363 | { | |
3364 | case TARGET_SIGNAL_TRAP: | |
3365 | case TARGET_SIGNAL_INT: | |
3366 | if (!allsigs && !sigs[signum]) | |
3367 | { | |
3368 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 3369 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
3370 | { |
3371 | sigs[signum] = 1; | |
3372 | } | |
3373 | else | |
3374 | { | |
3375 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3376 | gdb_flush (gdb_stdout); | |
3377 | } | |
3378 | } | |
3379 | break; | |
3380 | case TARGET_SIGNAL_0: | |
3381 | case TARGET_SIGNAL_DEFAULT: | |
3382 | case TARGET_SIGNAL_UNKNOWN: | |
3383 | /* Make sure that "all" doesn't print these. */ | |
3384 | break; | |
3385 | default: | |
3386 | sigs[signum] = 1; | |
3387 | break; | |
3388 | } | |
3389 | } | |
3390 | ||
3391 | argv++; | |
3392 | } | |
3393 | ||
39f77062 | 3394 | target_notice_signals (inferior_ptid); |
c906108c SS |
3395 | |
3396 | if (from_tty) | |
3397 | { | |
3398 | /* Show the results. */ | |
3399 | sig_print_header (); | |
3400 | for (signum = 0; signum < nsigs; signum++) | |
3401 | { | |
3402 | if (sigs[signum]) | |
3403 | { | |
3404 | sig_print_info (signum); | |
3405 | } | |
3406 | } | |
3407 | } | |
3408 | ||
3409 | do_cleanups (old_chain); | |
3410 | } | |
3411 | ||
3412 | static void | |
96baa820 | 3413 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3414 | { |
3415 | char **argv; | |
3416 | struct cleanup *old_chain; | |
3417 | ||
3418 | /* Break the command line up into args. */ | |
3419 | ||
3420 | argv = buildargv (args); | |
3421 | if (argv == NULL) | |
3422 | { | |
3423 | nomem (0); | |
3424 | } | |
7a292a7a | 3425 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3426 | if (argv[1] != (char *) NULL) |
3427 | { | |
3428 | char *argBuf; | |
3429 | int bufLen; | |
3430 | ||
3431 | bufLen = strlen (argv[0]) + 20; | |
3432 | argBuf = (char *) xmalloc (bufLen); | |
3433 | if (argBuf) | |
3434 | { | |
3435 | int validFlag = 1; | |
3436 | enum target_signal oursig; | |
3437 | ||
3438 | oursig = target_signal_from_name (argv[0]); | |
3439 | memset (argBuf, 0, bufLen); | |
3440 | if (strcmp (argv[1], "Q") == 0) | |
3441 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3442 | else | |
3443 | { | |
3444 | if (strcmp (argv[1], "s") == 0) | |
3445 | { | |
3446 | if (!signal_stop[oursig]) | |
3447 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3448 | else | |
3449 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3450 | } | |
3451 | else if (strcmp (argv[1], "i") == 0) | |
3452 | { | |
3453 | if (!signal_program[oursig]) | |
3454 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3455 | else | |
3456 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3457 | } | |
3458 | else if (strcmp (argv[1], "r") == 0) | |
3459 | { | |
3460 | if (!signal_print[oursig]) | |
3461 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3462 | else | |
3463 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3464 | } | |
3465 | else | |
3466 | validFlag = 0; | |
3467 | } | |
3468 | if (validFlag) | |
3469 | handle_command (argBuf, from_tty); | |
3470 | else | |
3471 | printf_filtered ("Invalid signal handling flag.\n"); | |
3472 | if (argBuf) | |
b8c9b27d | 3473 | xfree (argBuf); |
c906108c SS |
3474 | } |
3475 | } | |
3476 | do_cleanups (old_chain); | |
3477 | } | |
3478 | ||
3479 | /* Print current contents of the tables set by the handle command. | |
3480 | It is possible we should just be printing signals actually used | |
3481 | by the current target (but for things to work right when switching | |
3482 | targets, all signals should be in the signal tables). */ | |
3483 | ||
3484 | static void | |
96baa820 | 3485 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3486 | { |
3487 | enum target_signal oursig; | |
3488 | sig_print_header (); | |
3489 | ||
3490 | if (signum_exp) | |
3491 | { | |
3492 | /* First see if this is a symbol name. */ | |
3493 | oursig = target_signal_from_name (signum_exp); | |
3494 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3495 | { | |
3496 | /* No, try numeric. */ | |
3497 | oursig = | |
bb518678 | 3498 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3499 | } |
3500 | sig_print_info (oursig); | |
3501 | return; | |
3502 | } | |
3503 | ||
3504 | printf_filtered ("\n"); | |
3505 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3506 | for (oursig = TARGET_SIGNAL_FIRST; | |
3507 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3508 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3509 | { | |
3510 | QUIT; | |
3511 | ||
3512 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 3513 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
3514 | sig_print_info (oursig); |
3515 | } | |
3516 | ||
3517 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3518 | } | |
3519 | \f | |
7a292a7a SS |
3520 | struct inferior_status |
3521 | { | |
3522 | enum target_signal stop_signal; | |
3523 | CORE_ADDR stop_pc; | |
3524 | bpstat stop_bpstat; | |
3525 | int stop_step; | |
3526 | int stop_stack_dummy; | |
3527 | int stopped_by_random_signal; | |
3528 | int trap_expected; | |
3529 | CORE_ADDR step_range_start; | |
3530 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 3531 | struct frame_id step_frame_id; |
5fbbeb29 | 3532 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3533 | CORE_ADDR step_resume_break_address; |
3534 | int stop_after_trap; | |
c0236d92 | 3535 | int stop_soon; |
72cec141 | 3536 | struct regcache *stop_registers; |
7a292a7a SS |
3537 | |
3538 | /* These are here because if call_function_by_hand has written some | |
3539 | registers and then decides to call error(), we better not have changed | |
3540 | any registers. */ | |
72cec141 | 3541 | struct regcache *registers; |
7a292a7a | 3542 | |
101dcfbe AC |
3543 | /* A frame unique identifier. */ |
3544 | struct frame_id selected_frame_id; | |
3545 | ||
7a292a7a SS |
3546 | int breakpoint_proceeded; |
3547 | int restore_stack_info; | |
3548 | int proceed_to_finish; | |
3549 | }; | |
3550 | ||
7a292a7a | 3551 | void |
96baa820 JM |
3552 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3553 | LONGEST val) | |
7a292a7a | 3554 | { |
c5aa993b | 3555 | int size = REGISTER_RAW_SIZE (regno); |
7a292a7a SS |
3556 | void *buf = alloca (size); |
3557 | store_signed_integer (buf, size, val); | |
0818c12a | 3558 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
3559 | } |
3560 | ||
c906108c SS |
3561 | /* Save all of the information associated with the inferior<==>gdb |
3562 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3563 | (defined in inferior.h). */ | |
3564 | ||
7a292a7a | 3565 | struct inferior_status * |
96baa820 | 3566 | save_inferior_status (int restore_stack_info) |
c906108c | 3567 | { |
72cec141 | 3568 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 3569 | |
c906108c SS |
3570 | inf_status->stop_signal = stop_signal; |
3571 | inf_status->stop_pc = stop_pc; | |
3572 | inf_status->stop_step = stop_step; | |
3573 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3574 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3575 | inf_status->trap_expected = trap_expected; | |
3576 | inf_status->step_range_start = step_range_start; | |
3577 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 3578 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
3579 | inf_status->step_over_calls = step_over_calls; |
3580 | inf_status->stop_after_trap = stop_after_trap; | |
c0236d92 | 3581 | inf_status->stop_soon = stop_soon; |
c906108c SS |
3582 | /* Save original bpstat chain here; replace it with copy of chain. |
3583 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3584 | hand them back the original chain when restore_inferior_status is |
3585 | called. */ | |
c906108c SS |
3586 | inf_status->stop_bpstat = stop_bpstat; |
3587 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3588 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3589 | inf_status->restore_stack_info = restore_stack_info; | |
3590 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3591 | |
72cec141 | 3592 | inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers); |
c906108c | 3593 | |
72cec141 | 3594 | inf_status->registers = regcache_dup (current_regcache); |
c906108c | 3595 | |
7a424e99 | 3596 | inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame); |
7a292a7a | 3597 | return inf_status; |
c906108c SS |
3598 | } |
3599 | ||
c906108c | 3600 | static int |
96baa820 | 3601 | restore_selected_frame (void *args) |
c906108c | 3602 | { |
488f131b | 3603 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 3604 | struct frame_info *frame; |
c906108c | 3605 | |
101dcfbe | 3606 | frame = frame_find_by_id (*fid); |
c906108c | 3607 | |
aa0cd9c1 AC |
3608 | /* If inf_status->selected_frame_id is NULL, there was no previously |
3609 | selected frame. */ | |
101dcfbe | 3610 | if (frame == NULL) |
c906108c SS |
3611 | { |
3612 | warning ("Unable to restore previously selected frame.\n"); | |
3613 | return 0; | |
3614 | } | |
3615 | ||
0f7d239c | 3616 | select_frame (frame); |
c906108c SS |
3617 | |
3618 | return (1); | |
3619 | } | |
3620 | ||
3621 | void | |
96baa820 | 3622 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3623 | { |
3624 | stop_signal = inf_status->stop_signal; | |
3625 | stop_pc = inf_status->stop_pc; | |
3626 | stop_step = inf_status->stop_step; | |
3627 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3628 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3629 | trap_expected = inf_status->trap_expected; | |
3630 | step_range_start = inf_status->step_range_start; | |
3631 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 3632 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
3633 | step_over_calls = inf_status->step_over_calls; |
3634 | stop_after_trap = inf_status->stop_after_trap; | |
c0236d92 | 3635 | stop_soon = inf_status->stop_soon; |
c906108c SS |
3636 | bpstat_clear (&stop_bpstat); |
3637 | stop_bpstat = inf_status->stop_bpstat; | |
3638 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3639 | proceed_to_finish = inf_status->proceed_to_finish; | |
3640 | ||
72cec141 AC |
3641 | /* FIXME: Is the restore of stop_registers always needed. */ |
3642 | regcache_xfree (stop_registers); | |
3643 | stop_registers = inf_status->stop_registers; | |
c906108c SS |
3644 | |
3645 | /* The inferior can be gone if the user types "print exit(0)" | |
3646 | (and perhaps other times). */ | |
3647 | if (target_has_execution) | |
72cec141 AC |
3648 | /* NB: The register write goes through to the target. */ |
3649 | regcache_cpy (current_regcache, inf_status->registers); | |
3650 | regcache_xfree (inf_status->registers); | |
c906108c | 3651 | |
c906108c SS |
3652 | /* FIXME: If we are being called after stopping in a function which |
3653 | is called from gdb, we should not be trying to restore the | |
3654 | selected frame; it just prints a spurious error message (The | |
3655 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3656 | clobbers the stack)). In fact, should we be restoring the | |
3657 | inferior status at all in that case? . */ | |
3658 | ||
3659 | if (target_has_stack && inf_status->restore_stack_info) | |
3660 | { | |
c906108c | 3661 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
3662 | walking the stack might encounter a garbage pointer and |
3663 | error() trying to dereference it. */ | |
488f131b JB |
3664 | if (catch_errors |
3665 | (restore_selected_frame, &inf_status->selected_frame_id, | |
3666 | "Unable to restore previously selected frame:\n", | |
3667 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
3668 | /* Error in restoring the selected frame. Select the innermost |
3669 | frame. */ | |
0f7d239c | 3670 | select_frame (get_current_frame ()); |
c906108c SS |
3671 | |
3672 | } | |
c906108c | 3673 | |
72cec141 | 3674 | xfree (inf_status); |
7a292a7a | 3675 | } |
c906108c | 3676 | |
74b7792f AC |
3677 | static void |
3678 | do_restore_inferior_status_cleanup (void *sts) | |
3679 | { | |
3680 | restore_inferior_status (sts); | |
3681 | } | |
3682 | ||
3683 | struct cleanup * | |
3684 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
3685 | { | |
3686 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
3687 | } | |
3688 | ||
c906108c | 3689 | void |
96baa820 | 3690 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3691 | { |
3692 | /* See save_inferior_status for info on stop_bpstat. */ | |
3693 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 AC |
3694 | regcache_xfree (inf_status->registers); |
3695 | regcache_xfree (inf_status->stop_registers); | |
3696 | xfree (inf_status); | |
7a292a7a SS |
3697 | } |
3698 | ||
47932f85 DJ |
3699 | int |
3700 | inferior_has_forked (int pid, int *child_pid) | |
3701 | { | |
3702 | struct target_waitstatus last; | |
3703 | ptid_t last_ptid; | |
3704 | ||
3705 | get_last_target_status (&last_ptid, &last); | |
3706 | ||
3707 | if (last.kind != TARGET_WAITKIND_FORKED) | |
3708 | return 0; | |
3709 | ||
3710 | if (ptid_get_pid (last_ptid) != pid) | |
3711 | return 0; | |
3712 | ||
3713 | *child_pid = last.value.related_pid; | |
3714 | return 1; | |
3715 | } | |
3716 | ||
3717 | int | |
3718 | inferior_has_vforked (int pid, int *child_pid) | |
3719 | { | |
3720 | struct target_waitstatus last; | |
3721 | ptid_t last_ptid; | |
3722 | ||
3723 | get_last_target_status (&last_ptid, &last); | |
3724 | ||
3725 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
3726 | return 0; | |
3727 | ||
3728 | if (ptid_get_pid (last_ptid) != pid) | |
3729 | return 0; | |
3730 | ||
3731 | *child_pid = last.value.related_pid; | |
3732 | return 1; | |
3733 | } | |
3734 | ||
3735 | int | |
3736 | inferior_has_execd (int pid, char **execd_pathname) | |
3737 | { | |
3738 | struct target_waitstatus last; | |
3739 | ptid_t last_ptid; | |
3740 | ||
3741 | get_last_target_status (&last_ptid, &last); | |
3742 | ||
3743 | if (last.kind != TARGET_WAITKIND_EXECD) | |
3744 | return 0; | |
3745 | ||
3746 | if (ptid_get_pid (last_ptid) != pid) | |
3747 | return 0; | |
3748 | ||
3749 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
3750 | return 1; | |
3751 | } | |
3752 | ||
ca6724c1 KB |
3753 | /* Oft used ptids */ |
3754 | ptid_t null_ptid; | |
3755 | ptid_t minus_one_ptid; | |
3756 | ||
3757 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 3758 | |
ca6724c1 KB |
3759 | ptid_t |
3760 | ptid_build (int pid, long lwp, long tid) | |
3761 | { | |
3762 | ptid_t ptid; | |
3763 | ||
3764 | ptid.pid = pid; | |
3765 | ptid.lwp = lwp; | |
3766 | ptid.tid = tid; | |
3767 | return ptid; | |
3768 | } | |
3769 | ||
3770 | /* Create a ptid from just a pid. */ | |
3771 | ||
3772 | ptid_t | |
3773 | pid_to_ptid (int pid) | |
3774 | { | |
3775 | return ptid_build (pid, 0, 0); | |
3776 | } | |
3777 | ||
3778 | /* Fetch the pid (process id) component from a ptid. */ | |
3779 | ||
3780 | int | |
3781 | ptid_get_pid (ptid_t ptid) | |
3782 | { | |
3783 | return ptid.pid; | |
3784 | } | |
3785 | ||
3786 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
3787 | ||
3788 | long | |
3789 | ptid_get_lwp (ptid_t ptid) | |
3790 | { | |
3791 | return ptid.lwp; | |
3792 | } | |
3793 | ||
3794 | /* Fetch the tid (thread id) component from a ptid. */ | |
3795 | ||
3796 | long | |
3797 | ptid_get_tid (ptid_t ptid) | |
3798 | { | |
3799 | return ptid.tid; | |
3800 | } | |
3801 | ||
3802 | /* ptid_equal() is used to test equality of two ptids. */ | |
3803 | ||
3804 | int | |
3805 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
3806 | { | |
3807 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 3808 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
3809 | } |
3810 | ||
3811 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
3812 | to restore the inferior_ptid value saved in a call to | |
3813 | save_inferior_ptid(). */ | |
ce696e05 KB |
3814 | |
3815 | static void | |
3816 | restore_inferior_ptid (void *arg) | |
3817 | { | |
3818 | ptid_t *saved_ptid_ptr = arg; | |
3819 | inferior_ptid = *saved_ptid_ptr; | |
3820 | xfree (arg); | |
3821 | } | |
3822 | ||
3823 | /* Save the value of inferior_ptid so that it may be restored by a | |
3824 | later call to do_cleanups(). Returns the struct cleanup pointer | |
3825 | needed for later doing the cleanup. */ | |
3826 | ||
3827 | struct cleanup * | |
3828 | save_inferior_ptid (void) | |
3829 | { | |
3830 | ptid_t *saved_ptid_ptr; | |
3831 | ||
3832 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
3833 | *saved_ptid_ptr = inferior_ptid; | |
3834 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
3835 | } | |
c5aa993b | 3836 | \f |
488f131b | 3837 | |
7a292a7a | 3838 | static void |
96baa820 | 3839 | build_infrun (void) |
7a292a7a | 3840 | { |
72cec141 | 3841 | stop_registers = regcache_xmalloc (current_gdbarch); |
7a292a7a | 3842 | } |
c906108c | 3843 | |
c906108c | 3844 | void |
96baa820 | 3845 | _initialize_infrun (void) |
c906108c SS |
3846 | { |
3847 | register int i; | |
3848 | register int numsigs; | |
3849 | struct cmd_list_element *c; | |
3850 | ||
0f71a2f6 JM |
3851 | register_gdbarch_swap (&stop_registers, sizeof (stop_registers), NULL); |
3852 | register_gdbarch_swap (NULL, 0, build_infrun); | |
3853 | ||
c906108c SS |
3854 | add_info ("signals", signals_info, |
3855 | "What debugger does when program gets various signals.\n\ | |
3856 | Specify a signal as argument to print info on that signal only."); | |
3857 | add_info_alias ("handle", "signals", 0); | |
3858 | ||
3859 | add_com ("handle", class_run, handle_command, | |
3860 | concat ("Specify how to handle a signal.\n\ | |
3861 | Args are signals and actions to apply to those signals.\n\ | |
3862 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3863 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3864 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3865 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3866 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
3867 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
3868 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3869 | Print means print a message if this signal happens.\n\ | |
3870 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3871 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3872 | Pass and Stop may be combined.", NULL)); | |
3873 | if (xdb_commands) | |
3874 | { | |
3875 | add_com ("lz", class_info, signals_info, | |
3876 | "What debugger does when program gets various signals.\n\ | |
3877 | Specify a signal as argument to print info on that signal only."); | |
3878 | add_com ("z", class_run, xdb_handle_command, | |
3879 | concat ("Specify how to handle a signal.\n\ | |
3880 | Args are signals and actions to apply to those signals.\n\ | |
3881 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3882 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3883 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3884 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3885 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\ |
c906108c SS |
3886 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
3887 | nopass), \"Q\" (noprint)\n\ | |
3888 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3889 | Print means print a message if this signal happens.\n\ | |
3890 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3891 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3892 | Pass and Stop may be combined.", NULL)); | |
3893 | } | |
3894 | ||
3895 | if (!dbx_commands) | |
488f131b JB |
3896 | stop_command = |
3897 | 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 |
3898 | This allows you to set a list of commands to be run each time execution\n\ |
3899 | of the program stops.", &cmdlist); | |
3900 | ||
3901 | numsigs = (int) TARGET_SIGNAL_LAST; | |
488f131b | 3902 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
3903 | signal_print = (unsigned char *) |
3904 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
3905 | signal_program = (unsigned char *) | |
3906 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
3907 | for (i = 0; i < numsigs; i++) | |
3908 | { | |
3909 | signal_stop[i] = 1; | |
3910 | signal_print[i] = 1; | |
3911 | signal_program[i] = 1; | |
3912 | } | |
3913 | ||
3914 | /* Signals caused by debugger's own actions | |
3915 | should not be given to the program afterwards. */ | |
3916 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
3917 | signal_program[TARGET_SIGNAL_INT] = 0; | |
3918 | ||
3919 | /* Signals that are not errors should not normally enter the debugger. */ | |
3920 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
3921 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
3922 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
3923 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
3924 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
3925 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
3926 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
3927 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
3928 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
3929 | signal_print[TARGET_SIGNAL_IO] = 0; | |
3930 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
3931 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
3932 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
3933 | signal_print[TARGET_SIGNAL_URG] = 0; | |
3934 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
3935 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
3936 | ||
cd0fc7c3 SS |
3937 | /* These signals are used internally by user-level thread |
3938 | implementations. (See signal(5) on Solaris.) Like the above | |
3939 | signals, a healthy program receives and handles them as part of | |
3940 | its normal operation. */ | |
3941 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
3942 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
3943 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
3944 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
3945 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
3946 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
3947 | ||
c906108c SS |
3948 | #ifdef SOLIB_ADD |
3949 | add_show_from_set | |
3950 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, | |
3951 | (char *) &stop_on_solib_events, | |
3952 | "Set stopping for shared library events.\n\ | |
3953 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
3954 | notifies gdb of shared library events. The most common event of interest\n\ | |
488f131b | 3955 | to the user would be loading/unloading of a new library.\n", &setlist), &showlist); |
c906108c SS |
3956 | #endif |
3957 | ||
3958 | c = add_set_enum_cmd ("follow-fork-mode", | |
3959 | class_run, | |
488f131b | 3960 | follow_fork_mode_kind_names, &follow_fork_mode_string, |
c906108c SS |
3961 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 |
3962 | kernel problem. It's also not terribly useful without a GUI to | |
3963 | help the user drive two debuggers. So for now, I'm disabling | |
3964 | the "both" option. */ | |
c5aa993b JM |
3965 | /* "Set debugger response to a program call of fork \ |
3966 | or vfork.\n\ | |
3967 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
3968 | parent - the original process is debugged after a fork\n\ | |
3969 | child - the new process is debugged after a fork\n\ | |
3970 | both - both the parent and child are debugged after a fork\n\ | |
3971 | ask - the debugger will ask for one of the above choices\n\ | |
3972 | For \"both\", another copy of the debugger will be started to follow\n\ | |
3973 | the new child process. The original debugger will continue to follow\n\ | |
3974 | the original parent process. To distinguish their prompts, the\n\ | |
3975 | debugger copy's prompt will be changed.\n\ | |
3976 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
3977 | By default, the debugger will follow the parent process.", | |
3978 | */ | |
c906108c SS |
3979 | "Set debugger response to a program call of fork \ |
3980 | or vfork.\n\ | |
3981 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
3982 | parent - the original process is debugged after a fork\n\ | |
3983 | child - the new process is debugged after a fork\n\ | |
3984 | ask - the debugger will ask for one of the above choices\n\ | |
3985 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
488f131b | 3986 | By default, the debugger will follow the parent process.", &setlist); |
c906108c SS |
3987 | add_show_from_set (c, &showlist); |
3988 | ||
488f131b | 3989 | c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */ |
1ed2a135 | 3990 | &scheduler_mode, /* current mode */ |
c906108c SS |
3991 | "Set mode for locking scheduler during execution.\n\ |
3992 | off == no locking (threads may preempt at any time)\n\ | |
3993 | on == full locking (no thread except the current thread may run)\n\ | |
3994 | step == scheduler locked during every single-step operation.\n\ | |
3995 | In this mode, no other thread may run during a step command.\n\ | |
488f131b | 3996 | Other threads may run while stepping over a function call ('next').", &setlist); |
c906108c | 3997 | |
9f60d481 | 3998 | set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */ |
c906108c | 3999 | add_show_from_set (c, &showlist); |
5fbbeb29 CF |
4000 | |
4001 | c = add_set_cmd ("step-mode", class_run, | |
488f131b JB |
4002 | var_boolean, (char *) &step_stop_if_no_debug, |
4003 | "Set mode of the step operation. When set, doing a step over a\n\ | |
5fbbeb29 CF |
4004 | function without debug line information will stop at the first\n\ |
4005 | instruction of that function. Otherwise, the function is skipped and\n\ | |
488f131b | 4006 | the step command stops at a different source line.", &setlist); |
5fbbeb29 | 4007 | add_show_from_set (c, &showlist); |
ca6724c1 KB |
4008 | |
4009 | /* ptid initializations */ | |
4010 | null_ptid = ptid_build (0, 0, 0); | |
4011 | minus_one_ptid = ptid_build (-1, 0, 0); | |
4012 | inferior_ptid = null_ptid; | |
4013 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 4014 | } |