]>
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, | |
5 | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 Free Software | |
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" |
c906108c SS |
45 | |
46 | /* Prototypes for local functions */ | |
47 | ||
96baa820 | 48 | static void signals_info (char *, int); |
c906108c | 49 | |
96baa820 | 50 | static void handle_command (char *, int); |
c906108c | 51 | |
96baa820 | 52 | static void sig_print_info (enum target_signal); |
c906108c | 53 | |
96baa820 | 54 | static void sig_print_header (void); |
c906108c | 55 | |
74b7792f | 56 | static void resume_cleanups (void *); |
c906108c | 57 | |
96baa820 | 58 | static int hook_stop_stub (void *); |
c906108c | 59 | |
96baa820 | 60 | static void delete_breakpoint_current_contents (void *); |
c906108c | 61 | |
96baa820 | 62 | static void set_follow_fork_mode_command (char *arg, int from_tty, |
488f131b | 63 | struct cmd_list_element *c); |
7a292a7a | 64 | |
96baa820 JM |
65 | static int restore_selected_frame (void *); |
66 | ||
67 | static void build_infrun (void); | |
68 | ||
6604731b | 69 | static int follow_fork (); |
96baa820 JM |
70 | |
71 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 72 | struct cmd_list_element *c); |
96baa820 | 73 | |
96baa820 JM |
74 | struct execution_control_state; |
75 | ||
76 | static int currently_stepping (struct execution_control_state *ecs); | |
77 | ||
78 | static void xdb_handle_command (char *args, int from_tty); | |
79 | ||
80 | void _initialize_infrun (void); | |
43ff13b4 | 81 | |
c906108c SS |
82 | int inferior_ignoring_startup_exec_events = 0; |
83 | int inferior_ignoring_leading_exec_events = 0; | |
84 | ||
5fbbeb29 CF |
85 | /* When set, stop the 'step' command if we enter a function which has |
86 | no line number information. The normal behavior is that we step | |
87 | over such function. */ | |
88 | int step_stop_if_no_debug = 0; | |
89 | ||
43ff13b4 | 90 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 91 | |
43ff13b4 JM |
92 | int sync_execution = 0; |
93 | ||
c906108c SS |
94 | /* wait_for_inferior and normal_stop use this to notify the user |
95 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
96 | running in. */ |
97 | ||
39f77062 | 98 | static ptid_t previous_inferior_ptid; |
7a292a7a SS |
99 | |
100 | /* This is true for configurations that may follow through execl() and | |
101 | similar functions. At present this is only true for HP-UX native. */ | |
102 | ||
103 | #ifndef MAY_FOLLOW_EXEC | |
104 | #define MAY_FOLLOW_EXEC (0) | |
c906108c SS |
105 | #endif |
106 | ||
7a292a7a SS |
107 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
108 | ||
c906108c SS |
109 | /* Dynamic function trampolines are similar to solib trampolines in that they |
110 | are between the caller and the callee. The difference is that when you | |
111 | enter a dynamic trampoline, you can't determine the callee's address. Some | |
112 | (usually complex) code needs to run in the dynamic trampoline to figure out | |
113 | the callee's address. This macro is usually called twice. First, when we | |
114 | enter the trampoline (looks like a normal function call at that point). It | |
115 | should return the PC of a point within the trampoline where the callee's | |
116 | address is known. Second, when we hit the breakpoint, this routine returns | |
117 | the callee's address. At that point, things proceed as per a step resume | |
118 | breakpoint. */ | |
119 | ||
120 | #ifndef DYNAMIC_TRAMPOLINE_NEXTPC | |
121 | #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0 | |
122 | #endif | |
123 | ||
d4f3574e SS |
124 | /* If the program uses ELF-style shared libraries, then calls to |
125 | functions in shared libraries go through stubs, which live in a | |
126 | table called the PLT (Procedure Linkage Table). The first time the | |
127 | function is called, the stub sends control to the dynamic linker, | |
128 | which looks up the function's real address, patches the stub so | |
129 | that future calls will go directly to the function, and then passes | |
130 | control to the function. | |
131 | ||
132 | If we are stepping at the source level, we don't want to see any of | |
133 | this --- we just want to skip over the stub and the dynamic linker. | |
134 | The simple approach is to single-step until control leaves the | |
135 | dynamic linker. | |
136 | ||
ca557f44 AC |
137 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
138 | dynamic linker calls functions in the shared C library, so you | |
139 | can't tell from the PC alone whether the dynamic linker is still | |
140 | running. In this case, we use a step-resume breakpoint to get us | |
141 | past the dynamic linker, as if we were using "next" to step over a | |
142 | function call. | |
d4f3574e SS |
143 | |
144 | IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic | |
145 | linker code or not. Normally, this means we single-step. However, | |
146 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
147 | address where we can place a step-resume breakpoint to get past the | |
148 | linker's symbol resolution function. | |
149 | ||
150 | IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a | |
151 | pretty portable way, by comparing the PC against the address ranges | |
152 | of the dynamic linker's sections. | |
153 | ||
154 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
155 | it depends on internal details of the dynamic linker. It's usually | |
156 | not too hard to figure out where to put a breakpoint, but it | |
157 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
158 | sanity checking. If it can't figure things out, returning zero and | |
159 | getting the (possibly confusing) stepping behavior is better than | |
160 | signalling an error, which will obscure the change in the | |
161 | inferior's state. */ | |
c906108c SS |
162 | |
163 | #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
164 | #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 | |
165 | #endif | |
166 | ||
d4f3574e SS |
167 | #ifndef SKIP_SOLIB_RESOLVER |
168 | #define SKIP_SOLIB_RESOLVER(pc) 0 | |
169 | #endif | |
170 | ||
c906108c SS |
171 | /* This function returns TRUE if pc is the address of an instruction |
172 | that lies within the dynamic linker (such as the event hook, or the | |
173 | dld itself). | |
174 | ||
175 | This function must be used only when a dynamic linker event has | |
176 | been caught, and the inferior is being stepped out of the hook, or | |
177 | undefined results are guaranteed. */ | |
178 | ||
179 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
180 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
181 | #endif | |
182 | ||
183 | /* On MIPS16, a function that returns a floating point value may call | |
184 | a library helper function to copy the return value to a floating point | |
185 | register. The IGNORE_HELPER_CALL macro returns non-zero if we | |
186 | should ignore (i.e. step over) this function call. */ | |
187 | #ifndef IGNORE_HELPER_CALL | |
188 | #define IGNORE_HELPER_CALL(pc) 0 | |
189 | #endif | |
190 | ||
191 | /* On some systems, the PC may be left pointing at an instruction that won't | |
192 | actually be executed. This is usually indicated by a bit in the PSW. If | |
193 | we find ourselves in such a state, then we step the target beyond the | |
194 | nullified instruction before returning control to the user so as to avoid | |
195 | confusion. */ | |
196 | ||
197 | #ifndef INSTRUCTION_NULLIFIED | |
198 | #define INSTRUCTION_NULLIFIED 0 | |
199 | #endif | |
200 | ||
c2c6d25f JM |
201 | /* We can't step off a permanent breakpoint in the ordinary way, because we |
202 | can't remove it. Instead, we have to advance the PC to the next | |
203 | instruction. This macro should expand to a pointer to a function that | |
204 | does that, or zero if we have no such function. If we don't have a | |
205 | definition for it, we have to report an error. */ | |
488f131b | 206 | #ifndef SKIP_PERMANENT_BREAKPOINT |
c2c6d25f JM |
207 | #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint) |
208 | static void | |
c2d11a7d | 209 | default_skip_permanent_breakpoint (void) |
c2c6d25f | 210 | { |
255e7dbf | 211 | error ("\ |
c2c6d25f JM |
212 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ |
213 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
255e7dbf | 214 | a command like `return' or `jump' to continue execution."); |
c2c6d25f JM |
215 | } |
216 | #endif | |
488f131b | 217 | |
c2c6d25f | 218 | |
7a292a7a SS |
219 | /* Convert the #defines into values. This is temporary until wfi control |
220 | flow is completely sorted out. */ | |
221 | ||
222 | #ifndef HAVE_STEPPABLE_WATCHPOINT | |
223 | #define HAVE_STEPPABLE_WATCHPOINT 0 | |
224 | #else | |
225 | #undef HAVE_STEPPABLE_WATCHPOINT | |
226 | #define HAVE_STEPPABLE_WATCHPOINT 1 | |
227 | #endif | |
228 | ||
7a292a7a SS |
229 | #ifndef HAVE_CONTINUABLE_WATCHPOINT |
230 | #define HAVE_CONTINUABLE_WATCHPOINT 0 | |
231 | #else | |
232 | #undef HAVE_CONTINUABLE_WATCHPOINT | |
233 | #define HAVE_CONTINUABLE_WATCHPOINT 1 | |
234 | #endif | |
235 | ||
692590c1 MS |
236 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
237 | #define CANNOT_STEP_HW_WATCHPOINTS 0 | |
238 | #else | |
239 | #undef CANNOT_STEP_HW_WATCHPOINTS | |
240 | #define CANNOT_STEP_HW_WATCHPOINTS 1 | |
241 | #endif | |
242 | ||
c906108c SS |
243 | /* Tables of how to react to signals; the user sets them. */ |
244 | ||
245 | static unsigned char *signal_stop; | |
246 | static unsigned char *signal_print; | |
247 | static unsigned char *signal_program; | |
248 | ||
249 | #define SET_SIGS(nsigs,sigs,flags) \ | |
250 | do { \ | |
251 | int signum = (nsigs); \ | |
252 | while (signum-- > 0) \ | |
253 | if ((sigs)[signum]) \ | |
254 | (flags)[signum] = 1; \ | |
255 | } while (0) | |
256 | ||
257 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
258 | do { \ | |
259 | int signum = (nsigs); \ | |
260 | while (signum-- > 0) \ | |
261 | if ((sigs)[signum]) \ | |
262 | (flags)[signum] = 0; \ | |
263 | } while (0) | |
264 | ||
39f77062 KB |
265 | /* Value to pass to target_resume() to cause all threads to resume */ |
266 | ||
267 | #define RESUME_ALL (pid_to_ptid (-1)) | |
c906108c SS |
268 | |
269 | /* Command list pointer for the "stop" placeholder. */ | |
270 | ||
271 | static struct cmd_list_element *stop_command; | |
272 | ||
273 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
274 | ||
275 | static int breakpoints_inserted; | |
276 | ||
277 | /* Function inferior was in as of last step command. */ | |
278 | ||
279 | static struct symbol *step_start_function; | |
280 | ||
281 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
282 | ||
283 | static int trap_expected; | |
284 | ||
285 | #ifdef SOLIB_ADD | |
286 | /* Nonzero if we want to give control to the user when we're notified | |
287 | of shared library events by the dynamic linker. */ | |
288 | static int stop_on_solib_events; | |
289 | #endif | |
290 | ||
291 | #ifdef HP_OS_BUG | |
292 | /* Nonzero if the next time we try to continue the inferior, it will | |
293 | step one instruction and generate a spurious trace trap. | |
294 | This is used to compensate for a bug in HP-UX. */ | |
295 | ||
296 | static int trap_expected_after_continue; | |
297 | #endif | |
298 | ||
299 | /* Nonzero means expecting a trace trap | |
300 | and should stop the inferior and return silently when it happens. */ | |
301 | ||
302 | int stop_after_trap; | |
303 | ||
304 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
305 | It is used after attach, due to attaching to a process; | |
306 | when running in the shell before the child program has been exec'd; | |
307 | and when running some kinds of remote stuff (FIXME?). */ | |
308 | ||
309 | int stop_soon_quietly; | |
310 | ||
311 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
312 | situation when stop_registers should be saved. */ | |
313 | ||
314 | int proceed_to_finish; | |
315 | ||
316 | /* Save register contents here when about to pop a stack dummy frame, | |
317 | if-and-only-if proceed_to_finish is set. | |
318 | Thus this contains the return value from the called function (assuming | |
319 | values are returned in a register). */ | |
320 | ||
72cec141 | 321 | struct regcache *stop_registers; |
c906108c SS |
322 | |
323 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
324 | ||
325 | static int breakpoints_failed; | |
326 | ||
327 | /* Nonzero after stop if current stack frame should be printed. */ | |
328 | ||
329 | static int stop_print_frame; | |
330 | ||
331 | static struct breakpoint *step_resume_breakpoint = NULL; | |
332 | static struct breakpoint *through_sigtramp_breakpoint = NULL; | |
333 | ||
334 | /* On some platforms (e.g., HP-UX), hardware watchpoints have bad | |
335 | interactions with an inferior that is running a kernel function | |
336 | (aka, a system call or "syscall"). wait_for_inferior therefore | |
337 | may have a need to know when the inferior is in a syscall. This | |
338 | is a count of the number of inferior threads which are known to | |
339 | currently be running in a syscall. */ | |
340 | static int number_of_threads_in_syscalls; | |
341 | ||
e02bc4cc DS |
342 | /* This is a cached copy of the pid/waitstatus of the last event |
343 | returned by target_wait()/target_wait_hook(). This information is | |
344 | returned by get_last_target_status(). */ | |
39f77062 | 345 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
346 | static struct target_waitstatus target_last_waitstatus; |
347 | ||
c906108c SS |
348 | /* This is used to remember when a fork, vfork or exec event |
349 | was caught by a catchpoint, and thus the event is to be | |
350 | followed at the next resume of the inferior, and not | |
351 | immediately. */ | |
352 | static struct | |
488f131b JB |
353 | { |
354 | enum target_waitkind kind; | |
355 | struct | |
c906108c | 356 | { |
488f131b JB |
357 | int parent_pid; |
358 | int saw_parent_fork; | |
359 | int child_pid; | |
360 | int saw_child_fork; | |
361 | int saw_child_exec; | |
c906108c | 362 | } |
488f131b JB |
363 | fork_event; |
364 | char *execd_pathname; | |
365 | } | |
c906108c SS |
366 | pending_follow; |
367 | ||
53904c9e | 368 | static const char follow_fork_mode_ask[] = "ask"; |
53904c9e AC |
369 | static const char follow_fork_mode_child[] = "child"; |
370 | static const char follow_fork_mode_parent[] = "parent"; | |
371 | ||
488f131b | 372 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e | 373 | follow_fork_mode_ask, |
53904c9e AC |
374 | follow_fork_mode_child, |
375 | follow_fork_mode_parent, | |
376 | NULL | |
ef346e04 | 377 | }; |
c906108c | 378 | |
53904c9e | 379 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
c906108c SS |
380 | \f |
381 | ||
6604731b DJ |
382 | static int |
383 | follow_fork () | |
c906108c | 384 | { |
53904c9e | 385 | const char *follow_mode = follow_fork_mode_string; |
6604731b | 386 | int follow_child = (follow_mode == follow_fork_mode_child); |
c906108c SS |
387 | |
388 | /* Or, did the user not know, and want us to ask? */ | |
e28d556f | 389 | if (follow_fork_mode_string == follow_fork_mode_ask) |
c906108c | 390 | { |
8e65ff28 AC |
391 | internal_error (__FILE__, __LINE__, |
392 | "follow_inferior_fork: \"ask\" mode not implemented"); | |
53904c9e | 393 | /* follow_mode = follow_fork_mode_...; */ |
c906108c SS |
394 | } |
395 | ||
c906108c SS |
396 | pending_follow.fork_event.saw_parent_fork = 0; |
397 | pending_follow.fork_event.saw_child_fork = 0; | |
c906108c | 398 | |
6604731b | 399 | return target_follow_fork (follow_child); |
c906108c SS |
400 | } |
401 | ||
6604731b DJ |
402 | void |
403 | follow_inferior_reset_breakpoints (void) | |
c906108c | 404 | { |
6604731b DJ |
405 | /* Was there a step_resume breakpoint? (There was if the user |
406 | did a "next" at the fork() call.) If so, explicitly reset its | |
407 | thread number. | |
408 | ||
409 | step_resumes are a form of bp that are made to be per-thread. | |
410 | Since we created the step_resume bp when the parent process | |
411 | was being debugged, and now are switching to the child process, | |
412 | from the breakpoint package's viewpoint, that's a switch of | |
413 | "threads". We must update the bp's notion of which thread | |
414 | it is for, or it'll be ignored when it triggers. */ | |
415 | ||
416 | if (step_resume_breakpoint) | |
417 | breakpoint_re_set_thread (step_resume_breakpoint); | |
418 | ||
419 | /* Reinsert all breakpoints in the child. The user may have set | |
420 | breakpoints after catching the fork, in which case those | |
421 | were never set in the child, but only in the parent. This makes | |
422 | sure the inserted breakpoints match the breakpoint list. */ | |
423 | ||
424 | breakpoint_re_set (); | |
425 | insert_breakpoints (); | |
c906108c | 426 | } |
c906108c | 427 | |
1adeb98a FN |
428 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
429 | ||
c906108c | 430 | static void |
96baa820 | 431 | follow_exec (int pid, char *execd_pathname) |
c906108c | 432 | { |
c906108c | 433 | int saved_pid = pid; |
7a292a7a SS |
434 | struct target_ops *tgt; |
435 | ||
436 | if (!may_follow_exec) | |
437 | return; | |
c906108c | 438 | |
c906108c SS |
439 | /* This is an exec event that we actually wish to pay attention to. |
440 | Refresh our symbol table to the newly exec'd program, remove any | |
441 | momentary bp's, etc. | |
442 | ||
443 | If there are breakpoints, they aren't really inserted now, | |
444 | since the exec() transformed our inferior into a fresh set | |
445 | of instructions. | |
446 | ||
447 | We want to preserve symbolic breakpoints on the list, since | |
448 | we have hopes that they can be reset after the new a.out's | |
449 | symbol table is read. | |
450 | ||
451 | However, any "raw" breakpoints must be removed from the list | |
452 | (e.g., the solib bp's), since their address is probably invalid | |
453 | now. | |
454 | ||
455 | And, we DON'T want to call delete_breakpoints() here, since | |
456 | that may write the bp's "shadow contents" (the instruction | |
457 | value that was overwritten witha TRAP instruction). Since | |
458 | we now have a new a.out, those shadow contents aren't valid. */ | |
459 | update_breakpoints_after_exec (); | |
460 | ||
461 | /* If there was one, it's gone now. We cannot truly step-to-next | |
462 | statement through an exec(). */ | |
463 | step_resume_breakpoint = NULL; | |
464 | step_range_start = 0; | |
465 | step_range_end = 0; | |
466 | ||
467 | /* If there was one, it's gone now. */ | |
468 | through_sigtramp_breakpoint = NULL; | |
469 | ||
470 | /* What is this a.out's name? */ | |
471 | printf_unfiltered ("Executing new program: %s\n", execd_pathname); | |
472 | ||
473 | /* We've followed the inferior through an exec. Therefore, the | |
474 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
475 | |
476 | /* First collect the run target in effect. */ | |
477 | tgt = find_run_target (); | |
478 | /* If we can't find one, things are in a very strange state... */ | |
479 | if (tgt == NULL) | |
480 | error ("Could find run target to save before following exec"); | |
481 | ||
c906108c SS |
482 | gdb_flush (gdb_stdout); |
483 | target_mourn_inferior (); | |
39f77062 | 484 | inferior_ptid = pid_to_ptid (saved_pid); |
488f131b | 485 | /* Because mourn_inferior resets inferior_ptid. */ |
7a292a7a | 486 | push_target (tgt); |
c906108c SS |
487 | |
488 | /* That a.out is now the one to use. */ | |
489 | exec_file_attach (execd_pathname, 0); | |
490 | ||
491 | /* And also is where symbols can be found. */ | |
1adeb98a | 492 | symbol_file_add_main (execd_pathname, 0); |
c906108c SS |
493 | |
494 | /* Reset the shared library package. This ensures that we get | |
495 | a shlib event when the child reaches "_start", at which point | |
496 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 497 | #if defined(SOLIB_RESTART) |
c906108c | 498 | SOLIB_RESTART (); |
7a292a7a SS |
499 | #endif |
500 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
39f77062 | 501 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
7a292a7a | 502 | #endif |
c906108c SS |
503 | |
504 | /* Reinsert all breakpoints. (Those which were symbolic have | |
505 | been reset to the proper address in the new a.out, thanks | |
506 | to symbol_file_command...) */ | |
507 | insert_breakpoints (); | |
508 | ||
509 | /* The next resume of this inferior should bring it to the shlib | |
510 | startup breakpoints. (If the user had also set bp's on | |
511 | "main" from the old (parent) process, then they'll auto- | |
512 | matically get reset there in the new process.) */ | |
c906108c SS |
513 | } |
514 | ||
515 | /* Non-zero if we just simulating a single-step. This is needed | |
516 | because we cannot remove the breakpoints in the inferior process | |
517 | until after the `wait' in `wait_for_inferior'. */ | |
518 | static int singlestep_breakpoints_inserted_p = 0; | |
519 | \f | |
520 | ||
521 | /* Things to clean up if we QUIT out of resume (). */ | |
522 | /* ARGSUSED */ | |
523 | static void | |
74b7792f | 524 | resume_cleanups (void *ignore) |
c906108c SS |
525 | { |
526 | normal_stop (); | |
527 | } | |
528 | ||
53904c9e AC |
529 | static const char schedlock_off[] = "off"; |
530 | static const char schedlock_on[] = "on"; | |
531 | static const char schedlock_step[] = "step"; | |
532 | static const char *scheduler_mode = schedlock_off; | |
488f131b | 533 | static const char *scheduler_enums[] = { |
ef346e04 AC |
534 | schedlock_off, |
535 | schedlock_on, | |
536 | schedlock_step, | |
537 | NULL | |
538 | }; | |
c906108c SS |
539 | |
540 | static void | |
96baa820 | 541 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 542 | { |
1868c04e AC |
543 | /* NOTE: cagney/2002-03-17: The add_show_from_set() function clones |
544 | the set command passed as a parameter. The clone operation will | |
545 | include (BUG?) any ``set'' command callback, if present. | |
546 | Commands like ``info set'' call all the ``show'' command | |
547 | callbacks. Unfortunatly, for ``show'' commands cloned from | |
548 | ``set'', this includes callbacks belonging to ``set'' commands. | |
549 | Making this worse, this only occures if add_show_from_set() is | |
550 | called after add_cmd_sfunc() (BUG?). */ | |
551 | if (cmd_type (c) == set_cmd) | |
c906108c SS |
552 | if (!target_can_lock_scheduler) |
553 | { | |
554 | scheduler_mode = schedlock_off; | |
488f131b | 555 | error ("Target '%s' cannot support this command.", target_shortname); |
c906108c SS |
556 | } |
557 | } | |
558 | ||
559 | ||
560 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
561 | wants to interrupt some lengthy single-stepping operation | |
562 | (for child processes, the SIGINT goes to the inferior, and so | |
563 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
564 | other targets, that's not true). | |
565 | ||
566 | STEP nonzero if we should step (zero to continue instead). | |
567 | SIG is the signal to give the inferior (zero for none). */ | |
568 | void | |
96baa820 | 569 | resume (int step, enum target_signal sig) |
c906108c SS |
570 | { |
571 | int should_resume = 1; | |
74b7792f | 572 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
c906108c SS |
573 | QUIT; |
574 | ||
ef5cf84e MS |
575 | /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */ |
576 | ||
c906108c | 577 | |
692590c1 MS |
578 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
579 | over an instruction that causes a page fault without triggering | |
580 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
581 | stop, because the hardware watchpoint is not triggered, but it forgets | |
582 | the step request and continues the program normally. | |
583 | Work around the problem by removing hardware watchpoints if a step is | |
584 | requested, GDB will check for a hardware watchpoint trigger after the | |
585 | step anyway. */ | |
586 | if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) | |
587 | remove_hw_watchpoints (); | |
488f131b | 588 | |
692590c1 | 589 | |
c2c6d25f JM |
590 | /* Normally, by the time we reach `resume', the breakpoints are either |
591 | removed or inserted, as appropriate. The exception is if we're sitting | |
592 | at a permanent breakpoint; we need to step over it, but permanent | |
593 | breakpoints can't be removed. So we have to test for it here. */ | |
594 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
595 | SKIP_PERMANENT_BREAKPOINT (); | |
596 | ||
b0ed3589 | 597 | if (SOFTWARE_SINGLE_STEP_P () && step) |
c906108c SS |
598 | { |
599 | /* Do it the hard way, w/temp breakpoints */ | |
c5aa993b | 600 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
c906108c SS |
601 | /* ...and don't ask hardware to do it. */ |
602 | step = 0; | |
603 | /* and do not pull these breakpoints until after a `wait' in | |
604 | `wait_for_inferior' */ | |
605 | singlestep_breakpoints_inserted_p = 1; | |
606 | } | |
607 | ||
608 | /* Handle any optimized stores to the inferior NOW... */ | |
609 | #ifdef DO_DEFERRED_STORES | |
610 | DO_DEFERRED_STORES; | |
611 | #endif | |
612 | ||
c906108c | 613 | /* If there were any forks/vforks/execs that were caught and are |
6604731b | 614 | now to be followed, then do so. */ |
c906108c SS |
615 | switch (pending_follow.kind) |
616 | { | |
6604731b DJ |
617 | case TARGET_WAITKIND_FORKED: |
618 | case TARGET_WAITKIND_VFORKED: | |
c906108c | 619 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
6604731b DJ |
620 | if (follow_fork ()) |
621 | should_resume = 0; | |
c906108c SS |
622 | break; |
623 | ||
6604731b | 624 | case TARGET_WAITKIND_EXECD: |
c906108c | 625 | /* follow_exec is called as soon as the exec event is seen. */ |
6604731b | 626 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
c906108c SS |
627 | break; |
628 | ||
629 | default: | |
630 | break; | |
631 | } | |
c906108c SS |
632 | |
633 | /* Install inferior's terminal modes. */ | |
634 | target_terminal_inferior (); | |
635 | ||
636 | if (should_resume) | |
637 | { | |
39f77062 | 638 | ptid_t resume_ptid; |
dfcd3bfb | 639 | |
488f131b | 640 | resume_ptid = RESUME_ALL; /* Default */ |
ef5cf84e MS |
641 | |
642 | if ((step || singlestep_breakpoints_inserted_p) && | |
643 | !breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
c906108c | 644 | { |
ef5cf84e MS |
645 | /* Stepping past a breakpoint without inserting breakpoints. |
646 | Make sure only the current thread gets to step, so that | |
647 | other threads don't sneak past breakpoints while they are | |
648 | not inserted. */ | |
c906108c | 649 | |
ef5cf84e | 650 | resume_ptid = inferior_ptid; |
c906108c | 651 | } |
ef5cf84e MS |
652 | |
653 | if ((scheduler_mode == schedlock_on) || | |
488f131b | 654 | (scheduler_mode == schedlock_step && |
ef5cf84e | 655 | (step || singlestep_breakpoints_inserted_p))) |
c906108c | 656 | { |
ef5cf84e | 657 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 658 | resume_ptid = inferior_ptid; |
c906108c | 659 | } |
ef5cf84e | 660 | |
c4ed33b9 AC |
661 | if (CANNOT_STEP_BREAKPOINT) |
662 | { | |
663 | /* Most targets can step a breakpoint instruction, thus | |
664 | executing it normally. But if this one cannot, just | |
665 | continue and we will hit it anyway. */ | |
666 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
667 | step = 0; | |
668 | } | |
39f77062 | 669 | target_resume (resume_ptid, step, sig); |
c906108c SS |
670 | } |
671 | ||
672 | discard_cleanups (old_cleanups); | |
673 | } | |
674 | \f | |
675 | ||
676 | /* Clear out all variables saying what to do when inferior is continued. | |
677 | First do this, then set the ones you want, then call `proceed'. */ | |
678 | ||
679 | void | |
96baa820 | 680 | clear_proceed_status (void) |
c906108c SS |
681 | { |
682 | trap_expected = 0; | |
683 | step_range_start = 0; | |
684 | step_range_end = 0; | |
aa0cd9c1 | 685 | step_frame_id = null_frame_id; |
5fbbeb29 | 686 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c SS |
687 | stop_after_trap = 0; |
688 | stop_soon_quietly = 0; | |
689 | proceed_to_finish = 0; | |
690 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
691 | ||
692 | /* Discard any remaining commands or status from previous stop. */ | |
693 | bpstat_clear (&stop_bpstat); | |
694 | } | |
695 | ||
696 | /* Basic routine for continuing the program in various fashions. | |
697 | ||
698 | ADDR is the address to resume at, or -1 for resume where stopped. | |
699 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 700 | or -1 for act according to how it stopped. |
c906108c | 701 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
702 | -1 means return after that and print nothing. |
703 | You should probably set various step_... variables | |
704 | before calling here, if you are stepping. | |
c906108c SS |
705 | |
706 | You should call clear_proceed_status before calling proceed. */ | |
707 | ||
708 | void | |
96baa820 | 709 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
710 | { |
711 | int oneproc = 0; | |
712 | ||
713 | if (step > 0) | |
714 | step_start_function = find_pc_function (read_pc ()); | |
715 | if (step < 0) | |
716 | stop_after_trap = 1; | |
717 | ||
2acceee2 | 718 | if (addr == (CORE_ADDR) -1) |
c906108c SS |
719 | { |
720 | /* If there is a breakpoint at the address we will resume at, | |
c5aa993b JM |
721 | step one instruction before inserting breakpoints |
722 | so that we do not stop right away (and report a second | |
c906108c SS |
723 | hit at this breakpoint). */ |
724 | ||
725 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) | |
726 | oneproc = 1; | |
727 | ||
728 | #ifndef STEP_SKIPS_DELAY | |
729 | #define STEP_SKIPS_DELAY(pc) (0) | |
730 | #define STEP_SKIPS_DELAY_P (0) | |
731 | #endif | |
732 | /* Check breakpoint_here_p first, because breakpoint_here_p is fast | |
c5aa993b JM |
733 | (it just checks internal GDB data structures) and STEP_SKIPS_DELAY |
734 | is slow (it needs to read memory from the target). */ | |
c906108c SS |
735 | if (STEP_SKIPS_DELAY_P |
736 | && breakpoint_here_p (read_pc () + 4) | |
737 | && STEP_SKIPS_DELAY (read_pc ())) | |
738 | oneproc = 1; | |
739 | } | |
740 | else | |
741 | { | |
742 | write_pc (addr); | |
c906108c SS |
743 | } |
744 | ||
745 | #ifdef PREPARE_TO_PROCEED | |
746 | /* In a multi-threaded task we may select another thread | |
747 | and then continue or step. | |
748 | ||
749 | But if the old thread was stopped at a breakpoint, it | |
750 | will immediately cause another breakpoint stop without | |
751 | any execution (i.e. it will report a breakpoint hit | |
752 | incorrectly). So we must step over it first. | |
753 | ||
754 | PREPARE_TO_PROCEED checks the current thread against the thread | |
755 | that reported the most recent event. If a step-over is required | |
756 | it returns TRUE and sets the current thread to the old thread. */ | |
9e086581 | 757 | if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ())) |
c906108c SS |
758 | { |
759 | oneproc = 1; | |
c906108c SS |
760 | } |
761 | ||
762 | #endif /* PREPARE_TO_PROCEED */ | |
763 | ||
764 | #ifdef HP_OS_BUG | |
765 | if (trap_expected_after_continue) | |
766 | { | |
767 | /* If (step == 0), a trap will be automatically generated after | |
c5aa993b JM |
768 | the first instruction is executed. Force step one |
769 | instruction to clear this condition. This should not occur | |
770 | if step is nonzero, but it is harmless in that case. */ | |
c906108c SS |
771 | oneproc = 1; |
772 | trap_expected_after_continue = 0; | |
773 | } | |
774 | #endif /* HP_OS_BUG */ | |
775 | ||
776 | if (oneproc) | |
777 | /* We will get a trace trap after one instruction. | |
778 | Continue it automatically and insert breakpoints then. */ | |
779 | trap_expected = 1; | |
780 | else | |
781 | { | |
81d0cc19 GS |
782 | insert_breakpoints (); |
783 | /* If we get here there was no call to error() in | |
784 | insert breakpoints -- so they were inserted. */ | |
c906108c SS |
785 | breakpoints_inserted = 1; |
786 | } | |
787 | ||
788 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
789 | stop_signal = siggnal; | |
790 | /* If this signal should not be seen by program, | |
791 | give it zero. Used for debugging signals. */ | |
792 | else if (!signal_program[stop_signal]) | |
793 | stop_signal = TARGET_SIGNAL_0; | |
794 | ||
795 | annotate_starting (); | |
796 | ||
797 | /* Make sure that output from GDB appears before output from the | |
798 | inferior. */ | |
799 | gdb_flush (gdb_stdout); | |
800 | ||
801 | /* Resume inferior. */ | |
802 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
803 | ||
804 | /* Wait for it to stop (if not standalone) | |
805 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
806 | /* Do this only if we are not using the event loop, or if the target |
807 | does not support asynchronous execution. */ | |
6426a772 | 808 | if (!event_loop_p || !target_can_async_p ()) |
43ff13b4 JM |
809 | { |
810 | wait_for_inferior (); | |
811 | normal_stop (); | |
812 | } | |
c906108c SS |
813 | } |
814 | ||
815 | /* Record the pc and sp of the program the last time it stopped. | |
816 | These are just used internally by wait_for_inferior, but need | |
817 | to be preserved over calls to it and cleared when the inferior | |
818 | is started. */ | |
819 | static CORE_ADDR prev_pc; | |
820 | static CORE_ADDR prev_func_start; | |
821 | static char *prev_func_name; | |
822 | \f | |
823 | ||
824 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 825 | |
c906108c | 826 | void |
96baa820 | 827 | start_remote (void) |
c906108c SS |
828 | { |
829 | init_thread_list (); | |
830 | init_wait_for_inferior (); | |
831 | stop_soon_quietly = 1; | |
832 | trap_expected = 0; | |
43ff13b4 | 833 | |
6426a772 JM |
834 | /* Always go on waiting for the target, regardless of the mode. */ |
835 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 836 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
837 | nothing is returned (instead of just blocking). Because of this, |
838 | targets expecting an immediate response need to, internally, set | |
839 | things up so that the target_wait() is forced to eventually | |
840 | timeout. */ | |
841 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
842 | differentiate to its caller what the state of the target is after | |
843 | the initial open has been performed. Here we're assuming that | |
844 | the target has stopped. It should be possible to eventually have | |
845 | target_open() return to the caller an indication that the target | |
846 | is currently running and GDB state should be set to the same as | |
847 | for an async run. */ | |
848 | wait_for_inferior (); | |
849 | normal_stop (); | |
c906108c SS |
850 | } |
851 | ||
852 | /* Initialize static vars when a new inferior begins. */ | |
853 | ||
854 | void | |
96baa820 | 855 | init_wait_for_inferior (void) |
c906108c SS |
856 | { |
857 | /* These are meaningless until the first time through wait_for_inferior. */ | |
858 | prev_pc = 0; | |
859 | prev_func_start = 0; | |
860 | prev_func_name = NULL; | |
861 | ||
862 | #ifdef HP_OS_BUG | |
863 | trap_expected_after_continue = 0; | |
864 | #endif | |
865 | breakpoints_inserted = 0; | |
866 | breakpoint_init_inferior (inf_starting); | |
867 | ||
868 | /* Don't confuse first call to proceed(). */ | |
869 | stop_signal = TARGET_SIGNAL_0; | |
870 | ||
871 | /* The first resume is not following a fork/vfork/exec. */ | |
872 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
873 | pending_follow.fork_event.saw_parent_fork = 0; | |
874 | pending_follow.fork_event.saw_child_fork = 0; | |
875 | pending_follow.fork_event.saw_child_exec = 0; | |
876 | ||
877 | /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ | |
878 | number_of_threads_in_syscalls = 0; | |
879 | ||
880 | clear_proceed_status (); | |
881 | } | |
882 | ||
883 | static void | |
96baa820 | 884 | delete_breakpoint_current_contents (void *arg) |
c906108c SS |
885 | { |
886 | struct breakpoint **breakpointp = (struct breakpoint **) arg; | |
887 | if (*breakpointp != NULL) | |
888 | { | |
889 | delete_breakpoint (*breakpointp); | |
890 | *breakpointp = NULL; | |
891 | } | |
892 | } | |
893 | \f | |
b83266a0 SS |
894 | /* This enum encodes possible reasons for doing a target_wait, so that |
895 | wfi can call target_wait in one place. (Ultimately the call will be | |
896 | moved out of the infinite loop entirely.) */ | |
897 | ||
c5aa993b JM |
898 | enum infwait_states |
899 | { | |
cd0fc7c3 SS |
900 | infwait_normal_state, |
901 | infwait_thread_hop_state, | |
902 | infwait_nullified_state, | |
903 | infwait_nonstep_watch_state | |
b83266a0 SS |
904 | }; |
905 | ||
11cf8741 JM |
906 | /* Why did the inferior stop? Used to print the appropriate messages |
907 | to the interface from within handle_inferior_event(). */ | |
908 | enum inferior_stop_reason | |
909 | { | |
910 | /* We don't know why. */ | |
911 | STOP_UNKNOWN, | |
912 | /* Step, next, nexti, stepi finished. */ | |
913 | END_STEPPING_RANGE, | |
914 | /* Found breakpoint. */ | |
915 | BREAKPOINT_HIT, | |
916 | /* Inferior terminated by signal. */ | |
917 | SIGNAL_EXITED, | |
918 | /* Inferior exited. */ | |
919 | EXITED, | |
920 | /* Inferior received signal, and user asked to be notified. */ | |
921 | SIGNAL_RECEIVED | |
922 | }; | |
923 | ||
cd0fc7c3 SS |
924 | /* This structure contains what used to be local variables in |
925 | wait_for_inferior. Probably many of them can return to being | |
926 | locals in handle_inferior_event. */ | |
927 | ||
c5aa993b | 928 | struct execution_control_state |
488f131b JB |
929 | { |
930 | struct target_waitstatus ws; | |
931 | struct target_waitstatus *wp; | |
932 | int another_trap; | |
933 | int random_signal; | |
934 | CORE_ADDR stop_func_start; | |
935 | CORE_ADDR stop_func_end; | |
936 | char *stop_func_name; | |
937 | struct symtab_and_line sal; | |
938 | int remove_breakpoints_on_following_step; | |
939 | int current_line; | |
940 | struct symtab *current_symtab; | |
941 | int handling_longjmp; /* FIXME */ | |
942 | ptid_t ptid; | |
943 | ptid_t saved_inferior_ptid; | |
944 | int update_step_sp; | |
945 | int stepping_through_solib_after_catch; | |
946 | bpstat stepping_through_solib_catchpoints; | |
947 | int enable_hw_watchpoints_after_wait; | |
948 | int stepping_through_sigtramp; | |
949 | int new_thread_event; | |
950 | struct target_waitstatus tmpstatus; | |
951 | enum infwait_states infwait_state; | |
952 | ptid_t waiton_ptid; | |
953 | int wait_some_more; | |
954 | }; | |
955 | ||
956 | void init_execution_control_state (struct execution_control_state *ecs); | |
957 | ||
958 | void handle_inferior_event (struct execution_control_state *ecs); | |
cd0fc7c3 | 959 | |
104c1213 | 960 | static void check_sigtramp2 (struct execution_control_state *ecs); |
c2c6d25f | 961 | static void step_into_function (struct execution_control_state *ecs); |
d4f3574e | 962 | static void step_over_function (struct execution_control_state *ecs); |
104c1213 JM |
963 | static void stop_stepping (struct execution_control_state *ecs); |
964 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 965 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
966 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
967 | int stop_info); | |
104c1213 | 968 | |
cd0fc7c3 SS |
969 | /* Wait for control to return from inferior to debugger. |
970 | If inferior gets a signal, we may decide to start it up again | |
971 | instead of returning. That is why there is a loop in this function. | |
972 | When this function actually returns it means the inferior | |
973 | should be left stopped and GDB should read more commands. */ | |
974 | ||
975 | void | |
96baa820 | 976 | wait_for_inferior (void) |
cd0fc7c3 SS |
977 | { |
978 | struct cleanup *old_cleanups; | |
979 | struct execution_control_state ecss; | |
980 | struct execution_control_state *ecs; | |
c906108c | 981 | |
8601f500 | 982 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c SS |
983 | &step_resume_breakpoint); |
984 | make_cleanup (delete_breakpoint_current_contents, | |
985 | &through_sigtramp_breakpoint); | |
cd0fc7c3 SS |
986 | |
987 | /* wfi still stays in a loop, so it's OK just to take the address of | |
988 | a local to get the ecs pointer. */ | |
989 | ecs = &ecss; | |
990 | ||
991 | /* Fill in with reasonable starting values. */ | |
992 | init_execution_control_state (ecs); | |
993 | ||
c906108c | 994 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 995 | previous_inferior_ptid = inferior_ptid; |
c906108c | 996 | |
cd0fc7c3 SS |
997 | overlay_cache_invalid = 1; |
998 | ||
999 | /* We have to invalidate the registers BEFORE calling target_wait | |
1000 | because they can be loaded from the target while in target_wait. | |
1001 | This makes remote debugging a bit more efficient for those | |
1002 | targets that provide critical registers as part of their normal | |
1003 | status mechanism. */ | |
1004 | ||
1005 | registers_changed (); | |
b83266a0 | 1006 | |
c906108c SS |
1007 | while (1) |
1008 | { | |
cd0fc7c3 | 1009 | if (target_wait_hook) |
39f77062 | 1010 | ecs->ptid = target_wait_hook (ecs->waiton_ptid, ecs->wp); |
cd0fc7c3 | 1011 | else |
39f77062 | 1012 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
c906108c | 1013 | |
cd0fc7c3 SS |
1014 | /* Now figure out what to do with the result of the result. */ |
1015 | handle_inferior_event (ecs); | |
c906108c | 1016 | |
cd0fc7c3 SS |
1017 | if (!ecs->wait_some_more) |
1018 | break; | |
1019 | } | |
1020 | do_cleanups (old_cleanups); | |
1021 | } | |
c906108c | 1022 | |
43ff13b4 JM |
1023 | /* Asynchronous version of wait_for_inferior. It is called by the |
1024 | event loop whenever a change of state is detected on the file | |
1025 | descriptor corresponding to the target. It can be called more than | |
1026 | once to complete a single execution command. In such cases we need | |
1027 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1028 | last time that this function is called for a single execution | |
1029 | command, then report to the user that the inferior has stopped, and | |
1030 | do the necessary cleanups. */ | |
1031 | ||
1032 | struct execution_control_state async_ecss; | |
1033 | struct execution_control_state *async_ecs; | |
1034 | ||
1035 | void | |
fba45db2 | 1036 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1037 | { |
1038 | static struct cleanup *old_cleanups; | |
1039 | ||
c5aa993b | 1040 | async_ecs = &async_ecss; |
43ff13b4 JM |
1041 | |
1042 | if (!async_ecs->wait_some_more) | |
1043 | { | |
488f131b | 1044 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
c5aa993b | 1045 | &step_resume_breakpoint); |
43ff13b4 | 1046 | make_exec_cleanup (delete_breakpoint_current_contents, |
c5aa993b | 1047 | &through_sigtramp_breakpoint); |
43ff13b4 JM |
1048 | |
1049 | /* Fill in with reasonable starting values. */ | |
1050 | init_execution_control_state (async_ecs); | |
1051 | ||
43ff13b4 | 1052 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1053 | previous_inferior_ptid = inferior_ptid; |
43ff13b4 JM |
1054 | |
1055 | overlay_cache_invalid = 1; | |
1056 | ||
1057 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1058 | because they can be loaded from the target while in target_wait. |
1059 | This makes remote debugging a bit more efficient for those | |
1060 | targets that provide critical registers as part of their normal | |
1061 | status mechanism. */ | |
43ff13b4 JM |
1062 | |
1063 | registers_changed (); | |
1064 | } | |
1065 | ||
1066 | if (target_wait_hook) | |
488f131b JB |
1067 | async_ecs->ptid = |
1068 | target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); | |
43ff13b4 | 1069 | else |
39f77062 | 1070 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 JM |
1071 | |
1072 | /* Now figure out what to do with the result of the result. */ | |
1073 | handle_inferior_event (async_ecs); | |
1074 | ||
1075 | if (!async_ecs->wait_some_more) | |
1076 | { | |
adf40b2e | 1077 | /* Do only the cleanups that have been added by this |
488f131b JB |
1078 | function. Let the continuations for the commands do the rest, |
1079 | if there are any. */ | |
43ff13b4 JM |
1080 | do_exec_cleanups (old_cleanups); |
1081 | normal_stop (); | |
c2d11a7d JM |
1082 | if (step_multi && stop_step) |
1083 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1084 | else | |
1085 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1086 | } |
1087 | } | |
1088 | ||
cd0fc7c3 SS |
1089 | /* Prepare an execution control state for looping through a |
1090 | wait_for_inferior-type loop. */ | |
1091 | ||
1092 | void | |
96baa820 | 1093 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1094 | { |
c2d11a7d | 1095 | /* ecs->another_trap? */ |
cd0fc7c3 SS |
1096 | ecs->random_signal = 0; |
1097 | ecs->remove_breakpoints_on_following_step = 0; | |
1098 | ecs->handling_longjmp = 0; /* FIXME */ | |
1099 | ecs->update_step_sp = 0; | |
1100 | ecs->stepping_through_solib_after_catch = 0; | |
1101 | ecs->stepping_through_solib_catchpoints = NULL; | |
1102 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1103 | ecs->stepping_through_sigtramp = 0; | |
1104 | ecs->sal = find_pc_line (prev_pc, 0); | |
1105 | ecs->current_line = ecs->sal.line; | |
1106 | ecs->current_symtab = ecs->sal.symtab; | |
1107 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1108 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1109 | ecs->wp = &(ecs->ws); |
1110 | } | |
1111 | ||
a0b3c4fd | 1112 | /* Call this function before setting step_resume_breakpoint, as a |
53a5351d JM |
1113 | sanity check. There should never be more than one step-resume |
1114 | breakpoint per thread, so we should never be setting a new | |
1115 | step_resume_breakpoint when one is already active. */ | |
a0b3c4fd | 1116 | static void |
96baa820 | 1117 | check_for_old_step_resume_breakpoint (void) |
a0b3c4fd JM |
1118 | { |
1119 | if (step_resume_breakpoint) | |
488f131b JB |
1120 | warning |
1121 | ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint"); | |
a0b3c4fd JM |
1122 | } |
1123 | ||
e02bc4cc DS |
1124 | /* Return the cached copy of the last pid/waitstatus returned by |
1125 | target_wait()/target_wait_hook(). The data is actually cached by | |
1126 | handle_inferior_event(), which gets called immediately after | |
1127 | target_wait()/target_wait_hook(). */ | |
1128 | ||
1129 | void | |
488f131b | 1130 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1131 | { |
39f77062 | 1132 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1133 | *status = target_last_waitstatus; |
1134 | } | |
1135 | ||
dd80620e MS |
1136 | /* Switch thread contexts, maintaining "infrun state". */ |
1137 | ||
1138 | static void | |
1139 | context_switch (struct execution_control_state *ecs) | |
1140 | { | |
1141 | /* Caution: it may happen that the new thread (or the old one!) | |
1142 | is not in the thread list. In this case we must not attempt | |
1143 | to "switch context", or we run the risk that our context may | |
1144 | be lost. This may happen as a result of the target module | |
1145 | mishandling thread creation. */ | |
1146 | ||
1147 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) | |
488f131b | 1148 | { /* Perform infrun state context switch: */ |
dd80620e | 1149 | /* Save infrun state for the old thread. */ |
488f131b JB |
1150 | save_infrun_state (inferior_ptid, prev_pc, |
1151 | prev_func_start, prev_func_name, | |
dd80620e | 1152 | trap_expected, step_resume_breakpoint, |
488f131b | 1153 | through_sigtramp_breakpoint, step_range_start, |
aa0cd9c1 | 1154 | step_range_end, &step_frame_id, |
dd80620e MS |
1155 | ecs->handling_longjmp, ecs->another_trap, |
1156 | ecs->stepping_through_solib_after_catch, | |
1157 | ecs->stepping_through_solib_catchpoints, | |
1158 | ecs->stepping_through_sigtramp, | |
488f131b | 1159 | ecs->current_line, ecs->current_symtab, step_sp); |
dd80620e MS |
1160 | |
1161 | /* Load infrun state for the new thread. */ | |
488f131b JB |
1162 | load_infrun_state (ecs->ptid, &prev_pc, |
1163 | &prev_func_start, &prev_func_name, | |
dd80620e | 1164 | &trap_expected, &step_resume_breakpoint, |
488f131b | 1165 | &through_sigtramp_breakpoint, &step_range_start, |
aa0cd9c1 | 1166 | &step_range_end, &step_frame_id, |
dd80620e MS |
1167 | &ecs->handling_longjmp, &ecs->another_trap, |
1168 | &ecs->stepping_through_solib_after_catch, | |
1169 | &ecs->stepping_through_solib_catchpoints, | |
488f131b JB |
1170 | &ecs->stepping_through_sigtramp, |
1171 | &ecs->current_line, &ecs->current_symtab, &step_sp); | |
dd80620e MS |
1172 | } |
1173 | inferior_ptid = ecs->ptid; | |
1174 | } | |
1175 | ||
1176 | ||
cd0fc7c3 SS |
1177 | /* Given an execution control state that has been freshly filled in |
1178 | by an event from the inferior, figure out what it means and take | |
1179 | appropriate action. */ | |
c906108c | 1180 | |
cd0fc7c3 | 1181 | void |
96baa820 | 1182 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 SS |
1183 | { |
1184 | CORE_ADDR tmp; | |
1185 | int stepped_after_stopped_by_watchpoint; | |
c8edd8b4 | 1186 | int sw_single_step_trap_p = 0; |
cd0fc7c3 | 1187 | |
e02bc4cc | 1188 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1189 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1190 | target_last_waitstatus = *ecs->wp; |
1191 | ||
488f131b JB |
1192 | switch (ecs->infwait_state) |
1193 | { | |
1194 | case infwait_thread_hop_state: | |
1195 | /* Cancel the waiton_ptid. */ | |
1196 | ecs->waiton_ptid = pid_to_ptid (-1); | |
1197 | /* Fall thru to the normal_state case. */ | |
b83266a0 | 1198 | |
488f131b JB |
1199 | case infwait_normal_state: |
1200 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event | |
1201 | is serviced in this loop, below. */ | |
1202 | if (ecs->enable_hw_watchpoints_after_wait) | |
1203 | { | |
1204 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1205 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1206 | } | |
1207 | stepped_after_stopped_by_watchpoint = 0; | |
1208 | break; | |
b83266a0 | 1209 | |
488f131b JB |
1210 | case infwait_nullified_state: |
1211 | break; | |
b83266a0 | 1212 | |
488f131b JB |
1213 | case infwait_nonstep_watch_state: |
1214 | insert_breakpoints (); | |
c906108c | 1215 | |
488f131b JB |
1216 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1217 | handle things like signals arriving and other things happening | |
1218 | in combination correctly? */ | |
1219 | stepped_after_stopped_by_watchpoint = 1; | |
1220 | break; | |
1221 | } | |
1222 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1223 | |
488f131b | 1224 | flush_cached_frames (); |
c906108c | 1225 | |
488f131b | 1226 | /* If it's a new process, add it to the thread database */ |
c906108c | 1227 | |
488f131b JB |
1228 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
1229 | && !in_thread_list (ecs->ptid)); | |
1230 | ||
1231 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1232 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1233 | { | |
1234 | add_thread (ecs->ptid); | |
c906108c | 1235 | |
488f131b JB |
1236 | ui_out_text (uiout, "[New "); |
1237 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); | |
1238 | ui_out_text (uiout, "]\n"); | |
c906108c SS |
1239 | |
1240 | #if 0 | |
488f131b JB |
1241 | /* NOTE: This block is ONLY meant to be invoked in case of a |
1242 | "thread creation event"! If it is invoked for any other | |
1243 | sort of event (such as a new thread landing on a breakpoint), | |
1244 | the event will be discarded, which is almost certainly | |
1245 | a bad thing! | |
1246 | ||
1247 | To avoid this, the low-level module (eg. target_wait) | |
1248 | should call in_thread_list and add_thread, so that the | |
1249 | new thread is known by the time we get here. */ | |
1250 | ||
1251 | /* We may want to consider not doing a resume here in order | |
1252 | to give the user a chance to play with the new thread. | |
1253 | It might be good to make that a user-settable option. */ | |
1254 | ||
1255 | /* At this point, all threads are stopped (happens | |
1256 | automatically in either the OS or the native code). | |
1257 | Therefore we need to continue all threads in order to | |
1258 | make progress. */ | |
1259 | ||
1260 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1261 | prepare_to_wait (ecs); | |
1262 | return; | |
c906108c | 1263 | #endif |
488f131b | 1264 | } |
c906108c | 1265 | |
488f131b JB |
1266 | switch (ecs->ws.kind) |
1267 | { | |
1268 | case TARGET_WAITKIND_LOADED: | |
1269 | /* Ignore gracefully during startup of the inferior, as it | |
1270 | might be the shell which has just loaded some objects, | |
1271 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1272 | #ifdef SOLIB_ADD |
488f131b JB |
1273 | if (!stop_soon_quietly) |
1274 | { | |
1275 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1276 | breakpoint addresses via breakpoint_re_set. */ | |
1277 | if (breakpoints_inserted) | |
1278 | remove_breakpoints (); | |
c906108c | 1279 | |
488f131b JB |
1280 | /* Check for any newly added shared libraries if we're |
1281 | supposed to be adding them automatically. Switch | |
1282 | terminal for any messages produced by | |
1283 | breakpoint_re_set. */ | |
1284 | target_terminal_ours_for_output (); | |
1285 | SOLIB_ADD (NULL, 0, NULL, auto_solib_add); | |
1286 | target_terminal_inferior (); | |
1287 | ||
1288 | /* Reinsert breakpoints and continue. */ | |
1289 | if (breakpoints_inserted) | |
1290 | insert_breakpoints (); | |
1291 | } | |
c906108c | 1292 | #endif |
488f131b JB |
1293 | resume (0, TARGET_SIGNAL_0); |
1294 | prepare_to_wait (ecs); | |
1295 | return; | |
c5aa993b | 1296 | |
488f131b JB |
1297 | case TARGET_WAITKIND_SPURIOUS: |
1298 | resume (0, TARGET_SIGNAL_0); | |
1299 | prepare_to_wait (ecs); | |
1300 | return; | |
c5aa993b | 1301 | |
488f131b JB |
1302 | case TARGET_WAITKIND_EXITED: |
1303 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
1304 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
1305 | ||
1306 | /* Record the exit code in the convenience variable $_exitcode, so | |
1307 | that the user can inspect this again later. */ | |
1308 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1309 | value_from_longest (builtin_type_int, | |
1310 | (LONGEST) ecs->ws.value.integer)); | |
1311 | gdb_flush (gdb_stdout); | |
1312 | target_mourn_inferior (); | |
1313 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1314 | stop_print_frame = 0; | |
1315 | stop_stepping (ecs); | |
1316 | return; | |
c5aa993b | 1317 | |
488f131b JB |
1318 | case TARGET_WAITKIND_SIGNALLED: |
1319 | stop_print_frame = 0; | |
1320 | stop_signal = ecs->ws.value.sig; | |
1321 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1322 | |
488f131b JB |
1323 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1324 | reach here unless the inferior is dead. However, for years | |
1325 | target_kill() was called here, which hints that fatal signals aren't | |
1326 | really fatal on some systems. If that's true, then some changes | |
1327 | may be needed. */ | |
1328 | target_mourn_inferior (); | |
c906108c | 1329 | |
488f131b JB |
1330 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
1331 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1332 | stop_stepping (ecs); | |
1333 | return; | |
c906108c | 1334 | |
488f131b JB |
1335 | /* The following are the only cases in which we keep going; |
1336 | the above cases end in a continue or goto. */ | |
1337 | case TARGET_WAITKIND_FORKED: | |
1338 | stop_signal = TARGET_SIGNAL_TRAP; | |
1339 | pending_follow.kind = ecs->ws.kind; | |
1340 | ||
8e7d2c16 DJ |
1341 | pending_follow.fork_event.saw_child_fork = 1; |
1342 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); | |
1343 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c | 1344 | |
488f131b JB |
1345 | stop_pc = read_pc_pid (ecs->ptid); |
1346 | ecs->saved_inferior_ptid = inferior_ptid; | |
1347 | inferior_ptid = ecs->ptid; | |
1348 | /* The second argument of bpstat_stop_status is meant to help | |
1349 | distinguish between a breakpoint trap and a singlestep trap. | |
1350 | This is only important on targets where DECR_PC_AFTER_BREAK | |
1351 | is non-zero. The prev_pc test is meant to distinguish between | |
1352 | singlestepping a trap instruction, and singlestepping thru a | |
1353 | jump to the instruction following a trap instruction. */ | |
1354 | ||
1355 | stop_bpstat = bpstat_stop_status (&stop_pc, | |
1356 | currently_stepping (ecs) && | |
1357 | prev_pc != | |
1358 | stop_pc - DECR_PC_AFTER_BREAK); | |
1359 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); | |
1360 | inferior_ptid = ecs->saved_inferior_ptid; | |
1361 | goto process_event_stop_test; | |
1362 | ||
1363 | /* If this a platform which doesn't allow a debugger to touch a | |
1364 | vfork'd inferior until after it exec's, then we'd best keep | |
1365 | our fingers entirely off the inferior, other than continuing | |
1366 | it. This has the unfortunate side-effect that catchpoints | |
1367 | of vforks will be ignored. But since the platform doesn't | |
1368 | allow the inferior be touched at vfork time, there's really | |
1369 | little choice. */ | |
1370 | case TARGET_WAITKIND_VFORKED: | |
1371 | stop_signal = TARGET_SIGNAL_TRAP; | |
1372 | pending_follow.kind = ecs->ws.kind; | |
1373 | ||
1374 | /* Is this a vfork of the parent? If so, then give any | |
1375 | vfork catchpoints a chance to trigger now. (It's | |
1376 | dangerous to do so if the child canot be touched until | |
1377 | it execs, and the child has not yet exec'd. We probably | |
1378 | should warn the user to that effect when the catchpoint | |
1379 | triggers...) */ | |
1380 | if (ptid_equal (ecs->ptid, inferior_ptid)) | |
1381 | { | |
1382 | pending_follow.fork_event.saw_parent_fork = 1; | |
1383 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); | |
1384 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
1385 | } | |
c906108c | 1386 | |
488f131b JB |
1387 | /* If we've seen the child's vfork event but cannot really touch |
1388 | the child until it execs, then we must continue the child now. | |
1389 | Else, give any vfork catchpoints a chance to trigger now. */ | |
1390 | else | |
1391 | { | |
1392 | pending_follow.fork_event.saw_child_fork = 1; | |
1393 | pending_follow.fork_event.child_pid = PIDGET (ecs->ptid); | |
1394 | pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid; | |
1395 | target_post_startup_inferior (pid_to_ptid | |
1396 | (pending_follow.fork_event. | |
1397 | child_pid)); | |
488f131b | 1398 | } |
c906108c | 1399 | |
488f131b JB |
1400 | stop_pc = read_pc (); |
1401 | /* The second argument of bpstat_stop_status is meant to help | |
1402 | distinguish between a breakpoint trap and a singlestep trap. | |
1403 | This is only important on targets where DECR_PC_AFTER_BREAK | |
1404 | is non-zero. The prev_pc test is meant to distinguish between | |
1405 | singlestepping a trap instruction, and singlestepping thru a | |
1406 | jump to the instruction following a trap instruction. */ | |
1407 | ||
1408 | stop_bpstat = bpstat_stop_status (&stop_pc, | |
1409 | currently_stepping (ecs) && | |
1410 | prev_pc != | |
1411 | stop_pc - DECR_PC_AFTER_BREAK); | |
1412 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); | |
1413 | goto process_event_stop_test; | |
1414 | ||
1415 | case TARGET_WAITKIND_EXECD: | |
1416 | stop_signal = TARGET_SIGNAL_TRAP; | |
1417 | ||
7d2830a3 DJ |
1418 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
1419 | target_wait function. Until then following vfork on HP/UX 10.20 | |
1420 | is probably broken by this. Of course, it's broken anyway. */ | |
488f131b JB |
1421 | /* Is this a target which reports multiple exec events per actual |
1422 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1423 | ignore all but the last one. Just resume the exec'r, and wait | |
1424 | for the next exec event. */ | |
1425 | if (inferior_ignoring_leading_exec_events) | |
1426 | { | |
1427 | inferior_ignoring_leading_exec_events--; | |
1428 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1429 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event. | |
1430 | parent_pid); | |
1431 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); | |
1432 | prepare_to_wait (ecs); | |
1433 | return; | |
1434 | } | |
1435 | inferior_ignoring_leading_exec_events = | |
1436 | target_reported_exec_events_per_exec_call () - 1; | |
1437 | ||
1438 | pending_follow.execd_pathname = | |
1439 | savestring (ecs->ws.value.execd_pathname, | |
1440 | strlen (ecs->ws.value.execd_pathname)); | |
1441 | ||
488f131b JB |
1442 | /* This causes the eventpoints and symbol table to be reset. Must |
1443 | do this now, before trying to determine whether to stop. */ | |
1444 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); | |
1445 | xfree (pending_follow.execd_pathname); | |
c906108c | 1446 | |
488f131b JB |
1447 | stop_pc = read_pc_pid (ecs->ptid); |
1448 | ecs->saved_inferior_ptid = inferior_ptid; | |
1449 | inferior_ptid = ecs->ptid; | |
1450 | /* The second argument of bpstat_stop_status is meant to help | |
1451 | distinguish between a breakpoint trap and a singlestep trap. | |
1452 | This is only important on targets where DECR_PC_AFTER_BREAK | |
1453 | is non-zero. The prev_pc test is meant to distinguish between | |
1454 | singlestepping a trap instruction, and singlestepping thru a | |
1455 | jump to the instruction following a trap instruction. */ | |
1456 | ||
1457 | stop_bpstat = bpstat_stop_status (&stop_pc, | |
1458 | currently_stepping (ecs) && | |
1459 | prev_pc != | |
1460 | stop_pc - DECR_PC_AFTER_BREAK); | |
1461 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); | |
1462 | inferior_ptid = ecs->saved_inferior_ptid; | |
1463 | goto process_event_stop_test; | |
1464 | ||
1465 | /* These syscall events are returned on HP-UX, as part of its | |
1466 | implementation of page-protection-based "hardware" watchpoints. | |
1467 | HP-UX has unfortunate interactions between page-protections and | |
1468 | some system calls. Our solution is to disable hardware watches | |
1469 | when a system call is entered, and reenable them when the syscall | |
1470 | completes. The downside of this is that we may miss the precise | |
1471 | point at which a watched piece of memory is modified. "Oh well." | |
1472 | ||
1473 | Note that we may have multiple threads running, which may each | |
1474 | enter syscalls at roughly the same time. Since we don't have a | |
1475 | good notion currently of whether a watched piece of memory is | |
1476 | thread-private, we'd best not have any page-protections active | |
1477 | when any thread is in a syscall. Thus, we only want to reenable | |
1478 | hardware watches when no threads are in a syscall. | |
1479 | ||
1480 | Also, be careful not to try to gather much state about a thread | |
1481 | that's in a syscall. It's frequently a losing proposition. */ | |
1482 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
1483 | number_of_threads_in_syscalls++; | |
1484 | if (number_of_threads_in_syscalls == 1) | |
1485 | { | |
1486 | TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1487 | } | |
1488 | resume (0, TARGET_SIGNAL_0); | |
1489 | prepare_to_wait (ecs); | |
1490 | return; | |
c906108c | 1491 | |
488f131b JB |
1492 | /* Before examining the threads further, step this thread to |
1493 | get it entirely out of the syscall. (We get notice of the | |
1494 | event when the thread is just on the verge of exiting a | |
1495 | syscall. Stepping one instruction seems to get it back | |
1496 | into user code.) | |
c906108c | 1497 | |
488f131b JB |
1498 | Note that although the logical place to reenable h/w watches |
1499 | is here, we cannot. We cannot reenable them before stepping | |
1500 | the thread (this causes the next wait on the thread to hang). | |
c4093a6a | 1501 | |
488f131b JB |
1502 | Nor can we enable them after stepping until we've done a wait. |
1503 | Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait | |
1504 | here, which will be serviced immediately after the target | |
1505 | is waited on. */ | |
1506 | case TARGET_WAITKIND_SYSCALL_RETURN: | |
1507 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); | |
1508 | ||
1509 | if (number_of_threads_in_syscalls > 0) | |
1510 | { | |
1511 | number_of_threads_in_syscalls--; | |
1512 | ecs->enable_hw_watchpoints_after_wait = | |
1513 | (number_of_threads_in_syscalls == 0); | |
1514 | } | |
1515 | prepare_to_wait (ecs); | |
1516 | return; | |
c906108c | 1517 | |
488f131b JB |
1518 | case TARGET_WAITKIND_STOPPED: |
1519 | stop_signal = ecs->ws.value.sig; | |
1520 | break; | |
c906108c | 1521 | |
488f131b JB |
1522 | /* We had an event in the inferior, but we are not interested |
1523 | in handling it at this level. The lower layers have already | |
8e7d2c16 DJ |
1524 | done what needs to be done, if anything. |
1525 | ||
1526 | One of the possible circumstances for this is when the | |
1527 | inferior produces output for the console. The inferior has | |
1528 | not stopped, and we are ignoring the event. Another possible | |
1529 | circumstance is any event which the lower level knows will be | |
1530 | reported multiple times without an intervening resume. */ | |
488f131b | 1531 | case TARGET_WAITKIND_IGNORE: |
8e7d2c16 | 1532 | prepare_to_wait (ecs); |
488f131b JB |
1533 | return; |
1534 | } | |
c906108c | 1535 | |
488f131b JB |
1536 | /* We may want to consider not doing a resume here in order to give |
1537 | the user a chance to play with the new thread. It might be good | |
1538 | to make that a user-settable option. */ | |
c906108c | 1539 | |
488f131b JB |
1540 | /* At this point, all threads are stopped (happens automatically in |
1541 | either the OS or the native code). Therefore we need to continue | |
1542 | all threads in order to make progress. */ | |
1543 | if (ecs->new_thread_event) | |
1544 | { | |
1545 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1546 | prepare_to_wait (ecs); | |
1547 | return; | |
1548 | } | |
c906108c | 1549 | |
488f131b JB |
1550 | stop_pc = read_pc_pid (ecs->ptid); |
1551 | ||
1552 | /* See if a thread hit a thread-specific breakpoint that was meant for | |
1553 | another thread. If so, then step that thread past the breakpoint, | |
1554 | and continue it. */ | |
1555 | ||
1556 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1557 | { | |
f8d40ec8 JB |
1558 | /* Check if a regular breakpoint has been hit before checking |
1559 | for a potential single step breakpoint. Otherwise, GDB will | |
1560 | not see this breakpoint hit when stepping onto breakpoints. */ | |
1561 | if (breakpoints_inserted | |
1562 | && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK)) | |
488f131b | 1563 | { |
c5aa993b | 1564 | ecs->random_signal = 0; |
488f131b JB |
1565 | if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, |
1566 | ecs->ptid)) | |
1567 | { | |
1568 | int remove_status; | |
1569 | ||
1570 | /* Saw a breakpoint, but it was hit by the wrong thread. | |
1571 | Just continue. */ | |
1572 | if (DECR_PC_AFTER_BREAK) | |
1573 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, ecs->ptid); | |
1574 | ||
1575 | remove_status = remove_breakpoints (); | |
1576 | /* Did we fail to remove breakpoints? If so, try | |
1577 | to set the PC past the bp. (There's at least | |
1578 | one situation in which we can fail to remove | |
1579 | the bp's: On HP-UX's that use ttrace, we can't | |
1580 | change the address space of a vforking child | |
1581 | process until the child exits (well, okay, not | |
1582 | then either :-) or execs. */ | |
1583 | if (remove_status != 0) | |
1584 | { | |
1585 | /* FIXME! This is obviously non-portable! */ | |
1586 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, ecs->ptid); | |
1587 | /* We need to restart all the threads now, | |
1588 | * unles we're running in scheduler-locked mode. | |
1589 | * Use currently_stepping to determine whether to | |
1590 | * step or continue. | |
1591 | */ | |
1592 | /* FIXME MVS: is there any reason not to call resume()? */ | |
1593 | if (scheduler_mode == schedlock_on) | |
1594 | target_resume (ecs->ptid, | |
1595 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1596 | else | |
1597 | target_resume (RESUME_ALL, | |
1598 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1599 | prepare_to_wait (ecs); | |
1600 | return; | |
1601 | } | |
1602 | else | |
1603 | { /* Single step */ | |
1604 | breakpoints_inserted = 0; | |
1605 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
1606 | context_switch (ecs); | |
1607 | ecs->waiton_ptid = ecs->ptid; | |
1608 | ecs->wp = &(ecs->ws); | |
1609 | ecs->another_trap = 1; | |
1610 | ||
1611 | ecs->infwait_state = infwait_thread_hop_state; | |
1612 | keep_going (ecs); | |
1613 | registers_changed (); | |
1614 | return; | |
1615 | } | |
1616 | } | |
1617 | } | |
f8d40ec8 JB |
1618 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1619 | { | |
c8edd8b4 JB |
1620 | /* Readjust the stop_pc as it is off by DECR_PC_AFTER_BREAK |
1621 | compared to the value it would have if the system stepping | |
1622 | capability was used. This allows the rest of the code in | |
1623 | this function to use this address without having to worry | |
1624 | whether software single step is in use or not. */ | |
1625 | if (DECR_PC_AFTER_BREAK) | |
1626 | { | |
1627 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1628 | write_pc_pid (stop_pc, ecs->ptid); | |
1629 | } | |
1630 | ||
1631 | sw_single_step_trap_p = 1; | |
f8d40ec8 JB |
1632 | ecs->random_signal = 0; |
1633 | } | |
488f131b JB |
1634 | } |
1635 | else | |
1636 | ecs->random_signal = 1; | |
c906108c | 1637 | |
488f131b JB |
1638 | /* See if something interesting happened to the non-current thread. If |
1639 | so, then switch to that thread, and eventually give control back to | |
1640 | the user. | |
1641 | ||
1642 | Note that if there's any kind of pending follow (i.e., of a fork, | |
1643 | vfork or exec), we don't want to do this now. Rather, we'll let | |
1644 | the next resume handle it. */ | |
1645 | if (!ptid_equal (ecs->ptid, inferior_ptid) && | |
1646 | (pending_follow.kind == TARGET_WAITKIND_SPURIOUS)) | |
1647 | { | |
1648 | int printed = 0; | |
1649 | ||
1650 | /* If it's a random signal for a non-current thread, notify user | |
1651 | if he's expressed an interest. */ | |
1652 | if (ecs->random_signal && signal_print[stop_signal]) | |
1653 | { | |
c906108c SS |
1654 | /* ??rehrauer: I don't understand the rationale for this code. If the |
1655 | inferior will stop as a result of this signal, then the act of handling | |
1656 | the stop ought to print a message that's couches the stoppage in user | |
1657 | terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior | |
1658 | won't stop as a result of the signal -- i.e., if the signal is merely | |
1659 | a side-effect of something GDB's doing "under the covers" for the | |
1660 | user, such as stepping threads over a breakpoint they shouldn't stop | |
1661 | for -- then the message seems to be a serious annoyance at best. | |
1662 | ||
1663 | For now, remove the message altogether. */ | |
1664 | #if 0 | |
488f131b JB |
1665 | printed = 1; |
1666 | target_terminal_ours_for_output (); | |
1667 | printf_filtered ("\nProgram received signal %s, %s.\n", | |
1668 | target_signal_to_name (stop_signal), | |
1669 | target_signal_to_string (stop_signal)); | |
1670 | gdb_flush (gdb_stdout); | |
c906108c | 1671 | #endif |
488f131b | 1672 | } |
c906108c | 1673 | |
488f131b JB |
1674 | /* If it's not SIGTRAP and not a signal we want to stop for, then |
1675 | continue the thread. */ | |
c906108c | 1676 | |
488f131b JB |
1677 | if (stop_signal != TARGET_SIGNAL_TRAP && !signal_stop[stop_signal]) |
1678 | { | |
1679 | if (printed) | |
1680 | target_terminal_inferior (); | |
c906108c | 1681 | |
488f131b JB |
1682 | /* Clear the signal if it should not be passed. */ |
1683 | if (signal_program[stop_signal] == 0) | |
1684 | stop_signal = TARGET_SIGNAL_0; | |
c906108c | 1685 | |
488f131b JB |
1686 | target_resume (ecs->ptid, 0, stop_signal); |
1687 | prepare_to_wait (ecs); | |
1688 | return; | |
1689 | } | |
c906108c | 1690 | |
488f131b JB |
1691 | /* It's a SIGTRAP or a signal we're interested in. Switch threads, |
1692 | and fall into the rest of wait_for_inferior(). */ | |
c5aa993b | 1693 | |
488f131b | 1694 | context_switch (ecs); |
c5aa993b | 1695 | |
488f131b JB |
1696 | if (context_hook) |
1697 | context_hook (pid_to_thread_id (ecs->ptid)); | |
c5aa993b | 1698 | |
488f131b JB |
1699 | flush_cached_frames (); |
1700 | } | |
c906108c | 1701 | |
488f131b JB |
1702 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1703 | { | |
1704 | /* Pull the single step breakpoints out of the target. */ | |
1705 | SOFTWARE_SINGLE_STEP (0, 0); | |
1706 | singlestep_breakpoints_inserted_p = 0; | |
1707 | } | |
c906108c | 1708 | |
488f131b JB |
1709 | /* If PC is pointing at a nullified instruction, then step beyond |
1710 | it so that the user won't be confused when GDB appears to be ready | |
1711 | to execute it. */ | |
c906108c | 1712 | |
488f131b JB |
1713 | /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */ |
1714 | if (INSTRUCTION_NULLIFIED) | |
1715 | { | |
1716 | registers_changed (); | |
1717 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); | |
c906108c | 1718 | |
488f131b JB |
1719 | /* We may have received a signal that we want to pass to |
1720 | the inferior; therefore, we must not clobber the waitstatus | |
1721 | in WS. */ | |
c906108c | 1722 | |
488f131b JB |
1723 | ecs->infwait_state = infwait_nullified_state; |
1724 | ecs->waiton_ptid = ecs->ptid; | |
1725 | ecs->wp = &(ecs->tmpstatus); | |
1726 | prepare_to_wait (ecs); | |
1727 | return; | |
1728 | } | |
c906108c | 1729 | |
488f131b JB |
1730 | /* It may not be necessary to disable the watchpoint to stop over |
1731 | it. For example, the PA can (with some kernel cooperation) | |
1732 | single step over a watchpoint without disabling the watchpoint. */ | |
1733 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1734 | { | |
1735 | resume (1, 0); | |
1736 | prepare_to_wait (ecs); | |
1737 | return; | |
1738 | } | |
c906108c | 1739 | |
488f131b JB |
1740 | /* It is far more common to need to disable a watchpoint to step |
1741 | the inferior over it. FIXME. What else might a debug | |
1742 | register or page protection watchpoint scheme need here? */ | |
1743 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1744 | { | |
1745 | /* At this point, we are stopped at an instruction which has | |
1746 | attempted to write to a piece of memory under control of | |
1747 | a watchpoint. The instruction hasn't actually executed | |
1748 | yet. If we were to evaluate the watchpoint expression | |
1749 | now, we would get the old value, and therefore no change | |
1750 | would seem to have occurred. | |
1751 | ||
1752 | In order to make watchpoints work `right', we really need | |
1753 | to complete the memory write, and then evaluate the | |
1754 | watchpoint expression. The following code does that by | |
1755 | removing the watchpoint (actually, all watchpoints and | |
1756 | breakpoints), single-stepping the target, re-inserting | |
1757 | watchpoints, and then falling through to let normal | |
1758 | single-step processing handle proceed. Since this | |
1759 | includes evaluating watchpoints, things will come to a | |
1760 | stop in the correct manner. */ | |
1761 | ||
1762 | if (DECR_PC_AFTER_BREAK) | |
1763 | write_pc (stop_pc - DECR_PC_AFTER_BREAK); | |
c5aa993b | 1764 | |
488f131b JB |
1765 | remove_breakpoints (); |
1766 | registers_changed (); | |
1767 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
c5aa993b | 1768 | |
488f131b JB |
1769 | ecs->waiton_ptid = ecs->ptid; |
1770 | ecs->wp = &(ecs->ws); | |
1771 | ecs->infwait_state = infwait_nonstep_watch_state; | |
1772 | prepare_to_wait (ecs); | |
1773 | return; | |
1774 | } | |
1775 | ||
1776 | /* It may be possible to simply continue after a watchpoint. */ | |
1777 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
1778 | STOPPED_BY_WATCHPOINT (ecs->ws); | |
1779 | ||
1780 | ecs->stop_func_start = 0; | |
1781 | ecs->stop_func_end = 0; | |
1782 | ecs->stop_func_name = 0; | |
1783 | /* Don't care about return value; stop_func_start and stop_func_name | |
1784 | will both be 0 if it doesn't work. */ | |
1785 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
1786 | &ecs->stop_func_start, &ecs->stop_func_end); | |
1787 | ecs->stop_func_start += FUNCTION_START_OFFSET; | |
1788 | ecs->another_trap = 0; | |
1789 | bpstat_clear (&stop_bpstat); | |
1790 | stop_step = 0; | |
1791 | stop_stack_dummy = 0; | |
1792 | stop_print_frame = 1; | |
1793 | ecs->random_signal = 0; | |
1794 | stopped_by_random_signal = 0; | |
1795 | breakpoints_failed = 0; | |
1796 | ||
1797 | /* Look at the cause of the stop, and decide what to do. | |
1798 | The alternatives are: | |
1799 | 1) break; to really stop and return to the debugger, | |
1800 | 2) drop through to start up again | |
1801 | (set ecs->another_trap to 1 to single step once) | |
1802 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
1803 | will be made according to the signal handling tables. */ | |
1804 | ||
1805 | /* First, distinguish signals caused by the debugger from signals | |
1806 | that have to do with the program's own actions. | |
1807 | Note that breakpoint insns may cause SIGTRAP or SIGILL | |
1808 | or SIGEMT, depending on the operating system version. | |
1809 | Here we detect when a SIGILL or SIGEMT is really a breakpoint | |
1810 | and change it to SIGTRAP. */ | |
1811 | ||
1812 | if (stop_signal == TARGET_SIGNAL_TRAP | |
1813 | || (breakpoints_inserted && | |
1814 | (stop_signal == TARGET_SIGNAL_ILL | |
1815 | || stop_signal == TARGET_SIGNAL_EMT)) || stop_soon_quietly) | |
1816 | { | |
1817 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1818 | { | |
1819 | stop_print_frame = 0; | |
1820 | stop_stepping (ecs); | |
1821 | return; | |
1822 | } | |
1823 | if (stop_soon_quietly) | |
1824 | { | |
1825 | stop_stepping (ecs); | |
1826 | return; | |
1827 | } | |
1828 | ||
1829 | /* Don't even think about breakpoints | |
1830 | if just proceeded over a breakpoint. | |
1831 | ||
1832 | However, if we are trying to proceed over a breakpoint | |
1833 | and end up in sigtramp, then through_sigtramp_breakpoint | |
1834 | will be set and we should check whether we've hit the | |
1835 | step breakpoint. */ | |
1836 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected | |
1837 | && through_sigtramp_breakpoint == NULL) | |
1838 | bpstat_clear (&stop_bpstat); | |
1839 | else | |
1840 | { | |
1841 | /* See if there is a breakpoint at the current PC. */ | |
1842 | ||
1843 | /* The second argument of bpstat_stop_status is meant to help | |
1844 | distinguish between a breakpoint trap and a singlestep trap. | |
1845 | This is only important on targets where DECR_PC_AFTER_BREAK | |
1846 | is non-zero. The prev_pc test is meant to distinguish between | |
1847 | singlestepping a trap instruction, and singlestepping thru a | |
3e6564e1 JB |
1848 | jump to the instruction following a trap instruction. |
1849 | ||
1850 | Therefore, pass TRUE if our reason for stopping is | |
1851 | something other than hitting a breakpoint. We do this by | |
1852 | checking that either: we detected earlier a software single | |
1853 | step trap or, 1) stepping is going on and 2) we didn't hit | |
1854 | a breakpoint in a signal handler without an intervening stop | |
1855 | in sigtramp, which is detected by a new stack pointer value | |
1856 | below any usual function calling stack adjustments. */ | |
238617f6 JB |
1857 | stop_bpstat = |
1858 | bpstat_stop_status | |
1859 | (&stop_pc, | |
c8edd8b4 JB |
1860 | sw_single_step_trap_p |
1861 | || (currently_stepping (ecs) | |
1862 | && prev_pc != stop_pc - DECR_PC_AFTER_BREAK | |
1863 | && !(step_range_end | |
1864 | && INNER_THAN (read_sp (), (step_sp - 16))))); | |
488f131b JB |
1865 | /* Following in case break condition called a |
1866 | function. */ | |
1867 | stop_print_frame = 1; | |
1868 | } | |
1869 | ||
1870 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1871 | ecs->random_signal | |
1872 | = !(bpstat_explains_signal (stop_bpstat) | |
1873 | || trap_expected | |
1874 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P | |
ae45cd16 | 1875 | && DEPRECATED_PC_IN_CALL_DUMMY (stop_pc, read_sp (), |
c193f6ac | 1876 | get_frame_base (get_current_frame ()))) |
488f131b JB |
1877 | || (step_range_end && step_resume_breakpoint == NULL)); |
1878 | ||
1879 | else | |
1880 | { | |
1881 | ecs->random_signal = !(bpstat_explains_signal (stop_bpstat) | |
1882 | /* End of a stack dummy. Some systems (e.g. Sony | |
1883 | news) give another signal besides SIGTRAP, so | |
1884 | check here as well as above. */ | |
1885 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P | |
ae45cd16 | 1886 | && DEPRECATED_PC_IN_CALL_DUMMY (stop_pc, read_sp (), |
c193f6ac | 1887 | get_frame_base |
488f131b JB |
1888 | (get_current_frame |
1889 | ())))); | |
1890 | if (!ecs->random_signal) | |
1891 | stop_signal = TARGET_SIGNAL_TRAP; | |
1892 | } | |
1893 | } | |
1894 | ||
1895 | /* When we reach this point, we've pretty much decided | |
1896 | that the reason for stopping must've been a random | |
1897 | (unexpected) signal. */ | |
1898 | ||
1899 | else | |
1900 | ecs->random_signal = 1; | |
1901 | /* If a fork, vfork or exec event was seen, then there are two | |
1902 | possible responses we can make: | |
1903 | ||
1904 | 1. If a catchpoint triggers for the event (ecs->random_signal == 0), | |
1905 | then we must stop now and issue a prompt. We will resume | |
1906 | the inferior when the user tells us to. | |
1907 | 2. If no catchpoint triggers for the event (ecs->random_signal == 1), | |
1908 | then we must resume the inferior now and keep checking. | |
1909 | ||
1910 | In either case, we must take appropriate steps to "follow" the | |
1911 | the fork/vfork/exec when the inferior is resumed. For example, | |
1912 | if follow-fork-mode is "child", then we must detach from the | |
1913 | parent inferior and follow the new child inferior. | |
1914 | ||
1915 | In either case, setting pending_follow causes the next resume() | |
1916 | to take the appropriate following action. */ | |
1917 | process_event_stop_test: | |
1918 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
1919 | { | |
1920 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
1921 | { | |
1922 | trap_expected = 1; | |
1923 | stop_signal = TARGET_SIGNAL_0; | |
1924 | keep_going (ecs); | |
1925 | return; | |
1926 | } | |
1927 | } | |
1928 | else if (ecs->ws.kind == TARGET_WAITKIND_VFORKED) | |
1929 | { | |
1930 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
1931 | { | |
1932 | stop_signal = TARGET_SIGNAL_0; | |
1933 | keep_going (ecs); | |
1934 | return; | |
1935 | } | |
1936 | } | |
1937 | else if (ecs->ws.kind == TARGET_WAITKIND_EXECD) | |
1938 | { | |
1939 | pending_follow.kind = ecs->ws.kind; | |
1940 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
1941 | { | |
1942 | trap_expected = 1; | |
1943 | stop_signal = TARGET_SIGNAL_0; | |
1944 | keep_going (ecs); | |
1945 | return; | |
1946 | } | |
1947 | } | |
1948 | ||
1949 | /* For the program's own signals, act according to | |
1950 | the signal handling tables. */ | |
1951 | ||
1952 | if (ecs->random_signal) | |
1953 | { | |
1954 | /* Signal not for debugging purposes. */ | |
1955 | int printed = 0; | |
1956 | ||
1957 | stopped_by_random_signal = 1; | |
1958 | ||
1959 | if (signal_print[stop_signal]) | |
1960 | { | |
1961 | printed = 1; | |
1962 | target_terminal_ours_for_output (); | |
1963 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
1964 | } | |
1965 | if (signal_stop[stop_signal]) | |
1966 | { | |
1967 | stop_stepping (ecs); | |
1968 | return; | |
1969 | } | |
1970 | /* If not going to stop, give terminal back | |
1971 | if we took it away. */ | |
1972 | else if (printed) | |
1973 | target_terminal_inferior (); | |
1974 | ||
1975 | /* Clear the signal if it should not be passed. */ | |
1976 | if (signal_program[stop_signal] == 0) | |
1977 | stop_signal = TARGET_SIGNAL_0; | |
1978 | ||
1979 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
1980 | whether it could/should be keep_going. | |
1981 | ||
1982 | This used to jump to step_over_function if we are stepping, | |
1983 | which is wrong. | |
1984 | ||
1985 | Suppose the user does a `next' over a function call, and while | |
1986 | that call is in progress, the inferior receives a signal for | |
1987 | which GDB does not stop (i.e., signal_stop[SIG] is false). In | |
1988 | that case, when we reach this point, there is already a | |
1989 | step-resume breakpoint established, right where it should be: | |
1990 | immediately after the function call the user is "next"-ing | |
1991 | over. If we call step_over_function now, two bad things | |
1992 | happen: | |
1993 | ||
1994 | - we'll create a new breakpoint, at wherever the current | |
1995 | frame's return address happens to be. That could be | |
1996 | anywhere, depending on what function call happens to be on | |
1997 | the top of the stack at that point. Point is, it's probably | |
1998 | not where we need it. | |
1999 | ||
2000 | - the existing step-resume breakpoint (which is at the correct | |
2001 | address) will get orphaned: step_resume_breakpoint will point | |
2002 | to the new breakpoint, and the old step-resume breakpoint | |
2003 | will never be cleaned up. | |
2004 | ||
2005 | The old behavior was meant to help HP-UX single-step out of | |
2006 | sigtramps. It would place the new breakpoint at prev_pc, which | |
2007 | was certainly wrong. I don't know the details there, so fixing | |
2008 | this probably breaks that. As with anything else, it's up to | |
2009 | the HP-UX maintainer to furnish a fix that doesn't break other | |
2010 | platforms. --JimB, 20 May 1999 */ | |
2011 | check_sigtramp2 (ecs); | |
2012 | keep_going (ecs); | |
2013 | return; | |
2014 | } | |
2015 | ||
2016 | /* Handle cases caused by hitting a breakpoint. */ | |
2017 | { | |
2018 | CORE_ADDR jmp_buf_pc; | |
2019 | struct bpstat_what what; | |
2020 | ||
2021 | what = bpstat_what (stop_bpstat); | |
2022 | ||
2023 | if (what.call_dummy) | |
2024 | { | |
2025 | stop_stack_dummy = 1; | |
2026 | #ifdef HP_OS_BUG | |
2027 | trap_expected_after_continue = 1; | |
2028 | #endif | |
c5aa993b | 2029 | } |
c906108c | 2030 | |
488f131b | 2031 | switch (what.main_action) |
c5aa993b | 2032 | { |
488f131b JB |
2033 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2034 | /* If we hit the breakpoint at longjmp, disable it for the | |
2035 | duration of this command. Then, install a temporary | |
2036 | breakpoint at the target of the jmp_buf. */ | |
2037 | disable_longjmp_breakpoint (); | |
2038 | remove_breakpoints (); | |
2039 | breakpoints_inserted = 0; | |
2040 | if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
c5aa993b | 2041 | { |
488f131b | 2042 | keep_going (ecs); |
104c1213 | 2043 | return; |
c5aa993b | 2044 | } |
488f131b JB |
2045 | |
2046 | /* Need to blow away step-resume breakpoint, as it | |
2047 | interferes with us */ | |
2048 | if (step_resume_breakpoint != NULL) | |
104c1213 | 2049 | { |
488f131b | 2050 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
104c1213 | 2051 | } |
488f131b JB |
2052 | /* Not sure whether we need to blow this away too, but probably |
2053 | it is like the step-resume breakpoint. */ | |
2054 | if (through_sigtramp_breakpoint != NULL) | |
c5aa993b | 2055 | { |
488f131b JB |
2056 | delete_breakpoint (through_sigtramp_breakpoint); |
2057 | through_sigtramp_breakpoint = NULL; | |
c5aa993b | 2058 | } |
c906108c | 2059 | |
488f131b JB |
2060 | #if 0 |
2061 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2062 | if (step_over_calls > 0) | |
2063 | set_longjmp_resume_breakpoint (jmp_buf_pc, get_current_frame ()); | |
c5aa993b | 2064 | else |
488f131b JB |
2065 | #endif /* 0 */ |
2066 | set_longjmp_resume_breakpoint (jmp_buf_pc, NULL); | |
2067 | ecs->handling_longjmp = 1; /* FIXME */ | |
2068 | keep_going (ecs); | |
2069 | return; | |
c906108c | 2070 | |
488f131b JB |
2071 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2072 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
2073 | remove_breakpoints (); | |
2074 | breakpoints_inserted = 0; | |
2075 | #if 0 | |
2076 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2077 | if (step_over_calls | |
aa0cd9c1 AC |
2078 | && (frame_id_inner (get_frame_id (get_current_frame ()), |
2079 | step_frame_id))) | |
c5aa993b | 2080 | { |
488f131b | 2081 | ecs->another_trap = 1; |
d4f3574e SS |
2082 | keep_going (ecs); |
2083 | return; | |
c5aa993b | 2084 | } |
488f131b JB |
2085 | #endif /* 0 */ |
2086 | disable_longjmp_breakpoint (); | |
2087 | ecs->handling_longjmp = 0; /* FIXME */ | |
2088 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2089 | break; | |
2090 | /* else fallthrough */ | |
2091 | ||
2092 | case BPSTAT_WHAT_SINGLE: | |
2093 | if (breakpoints_inserted) | |
c5aa993b | 2094 | { |
488f131b | 2095 | remove_breakpoints (); |
c5aa993b | 2096 | } |
488f131b JB |
2097 | breakpoints_inserted = 0; |
2098 | ecs->another_trap = 1; | |
2099 | /* Still need to check other stuff, at least the case | |
2100 | where we are stepping and step out of the right range. */ | |
2101 | break; | |
c906108c | 2102 | |
488f131b JB |
2103 | case BPSTAT_WHAT_STOP_NOISY: |
2104 | stop_print_frame = 1; | |
c906108c | 2105 | |
488f131b JB |
2106 | /* We are about to nuke the step_resume_breakpoint and |
2107 | through_sigtramp_breakpoint via the cleanup chain, so | |
2108 | no need to worry about it here. */ | |
c5aa993b | 2109 | |
488f131b JB |
2110 | stop_stepping (ecs); |
2111 | return; | |
c5aa993b | 2112 | |
488f131b JB |
2113 | case BPSTAT_WHAT_STOP_SILENT: |
2114 | stop_print_frame = 0; | |
c5aa993b | 2115 | |
488f131b JB |
2116 | /* We are about to nuke the step_resume_breakpoint and |
2117 | through_sigtramp_breakpoint via the cleanup chain, so | |
2118 | no need to worry about it here. */ | |
c5aa993b | 2119 | |
488f131b | 2120 | stop_stepping (ecs); |
e441088d | 2121 | return; |
c5aa993b | 2122 | |
488f131b JB |
2123 | case BPSTAT_WHAT_STEP_RESUME: |
2124 | /* This proably demands a more elegant solution, but, yeah | |
2125 | right... | |
c5aa993b | 2126 | |
488f131b JB |
2127 | This function's use of the simple variable |
2128 | step_resume_breakpoint doesn't seem to accomodate | |
2129 | simultaneously active step-resume bp's, although the | |
2130 | breakpoint list certainly can. | |
c5aa993b | 2131 | |
488f131b JB |
2132 | If we reach here and step_resume_breakpoint is already |
2133 | NULL, then apparently we have multiple active | |
2134 | step-resume bp's. We'll just delete the breakpoint we | |
2135 | stopped at, and carry on. | |
2136 | ||
2137 | Correction: what the code currently does is delete a | |
2138 | step-resume bp, but it makes no effort to ensure that | |
2139 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2140 | |
488f131b JB |
2141 | if (step_resume_breakpoint == NULL) |
2142 | { | |
2143 | step_resume_breakpoint = | |
2144 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2145 | } | |
2146 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
2147 | break; | |
2148 | ||
2149 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
2150 | if (through_sigtramp_breakpoint) | |
2151 | delete_breakpoint (through_sigtramp_breakpoint); | |
2152 | through_sigtramp_breakpoint = NULL; | |
2153 | ||
2154 | /* If were waiting for a trap, hitting the step_resume_break | |
2155 | doesn't count as getting it. */ | |
2156 | if (trap_expected) | |
2157 | ecs->another_trap = 1; | |
2158 | break; | |
2159 | ||
2160 | case BPSTAT_WHAT_CHECK_SHLIBS: | |
2161 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2162 | #ifdef SOLIB_ADD | |
c906108c | 2163 | { |
488f131b JB |
2164 | /* Remove breakpoints, we eventually want to step over the |
2165 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2166 | breakpoint addresses via breakpoint_re_set. */ | |
2167 | if (breakpoints_inserted) | |
2168 | remove_breakpoints (); | |
c5aa993b | 2169 | breakpoints_inserted = 0; |
488f131b JB |
2170 | |
2171 | /* Check for any newly added shared libraries if we're | |
2172 | supposed to be adding them automatically. Switch | |
2173 | terminal for any messages produced by | |
2174 | breakpoint_re_set. */ | |
2175 | target_terminal_ours_for_output (); | |
2176 | SOLIB_ADD (NULL, 0, NULL, auto_solib_add); | |
2177 | target_terminal_inferior (); | |
2178 | ||
2179 | /* Try to reenable shared library breakpoints, additional | |
2180 | code segments in shared libraries might be mapped in now. */ | |
2181 | re_enable_breakpoints_in_shlibs (); | |
2182 | ||
2183 | /* If requested, stop when the dynamic linker notifies | |
2184 | gdb of events. This allows the user to get control | |
2185 | and place breakpoints in initializer routines for | |
2186 | dynamically loaded objects (among other things). */ | |
2187 | if (stop_on_solib_events) | |
d4f3574e | 2188 | { |
488f131b | 2189 | stop_stepping (ecs); |
d4f3574e SS |
2190 | return; |
2191 | } | |
c5aa993b | 2192 | |
488f131b JB |
2193 | /* If we stopped due to an explicit catchpoint, then the |
2194 | (see above) call to SOLIB_ADD pulled in any symbols | |
2195 | from a newly-loaded library, if appropriate. | |
2196 | ||
2197 | We do want the inferior to stop, but not where it is | |
2198 | now, which is in the dynamic linker callback. Rather, | |
2199 | we would like it stop in the user's program, just after | |
2200 | the call that caused this catchpoint to trigger. That | |
2201 | gives the user a more useful vantage from which to | |
2202 | examine their program's state. */ | |
2203 | else if (what.main_action == | |
2204 | BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
c906108c | 2205 | { |
488f131b JB |
2206 | /* ??rehrauer: If I could figure out how to get the |
2207 | right return PC from here, we could just set a temp | |
2208 | breakpoint and resume. I'm not sure we can without | |
2209 | cracking open the dld's shared libraries and sniffing | |
2210 | their unwind tables and text/data ranges, and that's | |
2211 | not a terribly portable notion. | |
2212 | ||
2213 | Until that time, we must step the inferior out of the | |
2214 | dld callback, and also out of the dld itself (and any | |
2215 | code or stubs in libdld.sl, such as "shl_load" and | |
2216 | friends) until we reach non-dld code. At that point, | |
2217 | we can stop stepping. */ | |
2218 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2219 | &ecs-> | |
2220 | stepping_through_solib_catchpoints); | |
2221 | ecs->stepping_through_solib_after_catch = 1; | |
2222 | ||
2223 | /* Be sure to lift all breakpoints, so the inferior does | |
2224 | actually step past this point... */ | |
2225 | ecs->another_trap = 1; | |
2226 | break; | |
c906108c | 2227 | } |
c5aa993b | 2228 | else |
c5aa993b | 2229 | { |
488f131b | 2230 | /* We want to step over this breakpoint, then keep going. */ |
c5aa993b | 2231 | ecs->another_trap = 1; |
488f131b | 2232 | break; |
c5aa993b | 2233 | } |
488f131b JB |
2234 | } |
2235 | #endif | |
2236 | break; | |
c906108c | 2237 | |
488f131b JB |
2238 | case BPSTAT_WHAT_LAST: |
2239 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2240 | |
488f131b JB |
2241 | case BPSTAT_WHAT_KEEP_CHECKING: |
2242 | break; | |
2243 | } | |
2244 | } | |
c906108c | 2245 | |
488f131b JB |
2246 | /* We come here if we hit a breakpoint but should not |
2247 | stop for it. Possibly we also were stepping | |
2248 | and should stop for that. So fall through and | |
2249 | test for stepping. But, if not stepping, | |
2250 | do not stop. */ | |
c906108c | 2251 | |
488f131b JB |
2252 | /* Are we stepping to get the inferior out of the dynamic |
2253 | linker's hook (and possibly the dld itself) after catching | |
2254 | a shlib event? */ | |
2255 | if (ecs->stepping_through_solib_after_catch) | |
2256 | { | |
2257 | #if defined(SOLIB_ADD) | |
2258 | /* Have we reached our destination? If not, keep going. */ | |
2259 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2260 | { | |
2261 | ecs->another_trap = 1; | |
2262 | keep_going (ecs); | |
104c1213 | 2263 | return; |
488f131b JB |
2264 | } |
2265 | #endif | |
2266 | /* Else, stop and report the catchpoint(s) whose triggering | |
2267 | caused us to begin stepping. */ | |
2268 | ecs->stepping_through_solib_after_catch = 0; | |
2269 | bpstat_clear (&stop_bpstat); | |
2270 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2271 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2272 | stop_print_frame = 1; | |
2273 | stop_stepping (ecs); | |
2274 | return; | |
2275 | } | |
c906108c | 2276 | |
488f131b JB |
2277 | if (!CALL_DUMMY_BREAKPOINT_OFFSET_P) |
2278 | { | |
2279 | /* This is the old way of detecting the end of the stack dummy. | |
2280 | An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets | |
2281 | handled above. As soon as we can test it on all of them, all | |
2282 | architectures should define it. */ | |
2283 | ||
2284 | /* If this is the breakpoint at the end of a stack dummy, | |
2285 | just stop silently, unless the user was doing an si/ni, in which | |
2286 | case she'd better know what she's doing. */ | |
2287 | ||
2288 | if (CALL_DUMMY_HAS_COMPLETED (stop_pc, read_sp (), | |
c193f6ac | 2289 | get_frame_base (get_current_frame ())) |
488f131b JB |
2290 | && !step_range_end) |
2291 | { | |
c5aa993b | 2292 | stop_print_frame = 0; |
488f131b JB |
2293 | stop_stack_dummy = 1; |
2294 | #ifdef HP_OS_BUG | |
2295 | trap_expected_after_continue = 1; | |
2296 | #endif | |
104c1213 JM |
2297 | stop_stepping (ecs); |
2298 | return; | |
488f131b JB |
2299 | } |
2300 | } | |
c906108c | 2301 | |
488f131b JB |
2302 | if (step_resume_breakpoint) |
2303 | { | |
2304 | /* Having a step-resume breakpoint overrides anything | |
2305 | else having to do with stepping commands until | |
2306 | that breakpoint is reached. */ | |
2307 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2308 | whether it could/should be keep_going. */ | |
2309 | check_sigtramp2 (ecs); | |
2310 | keep_going (ecs); | |
2311 | return; | |
2312 | } | |
c5aa993b | 2313 | |
488f131b JB |
2314 | if (step_range_end == 0) |
2315 | { | |
2316 | /* Likewise if we aren't even stepping. */ | |
2317 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2318 | whether it could/should be keep_going. */ | |
2319 | check_sigtramp2 (ecs); | |
2320 | keep_going (ecs); | |
2321 | return; | |
2322 | } | |
c5aa993b | 2323 | |
488f131b | 2324 | /* If stepping through a line, keep going if still within it. |
c906108c | 2325 | |
488f131b JB |
2326 | Note that step_range_end is the address of the first instruction |
2327 | beyond the step range, and NOT the address of the last instruction | |
2328 | within it! */ | |
2329 | if (stop_pc >= step_range_start && stop_pc < step_range_end) | |
2330 | { | |
2331 | /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal. | |
2332 | So definately need to check for sigtramp here. */ | |
2333 | check_sigtramp2 (ecs); | |
2334 | keep_going (ecs); | |
2335 | return; | |
2336 | } | |
c5aa993b | 2337 | |
488f131b | 2338 | /* We stepped out of the stepping range. */ |
c906108c | 2339 | |
488f131b JB |
2340 | /* If we are stepping at the source level and entered the runtime |
2341 | loader dynamic symbol resolution code, we keep on single stepping | |
2342 | until we exit the run time loader code and reach the callee's | |
2343 | address. */ | |
2344 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2345 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) | |
2346 | { | |
2347 | CORE_ADDR pc_after_resolver = SKIP_SOLIB_RESOLVER (stop_pc); | |
c906108c | 2348 | |
488f131b JB |
2349 | if (pc_after_resolver) |
2350 | { | |
2351 | /* Set up a step-resume breakpoint at the address | |
2352 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2353 | struct symtab_and_line sr_sal; | |
fe39c653 | 2354 | init_sal (&sr_sal); |
488f131b JB |
2355 | sr_sal.pc = pc_after_resolver; |
2356 | ||
2357 | check_for_old_step_resume_breakpoint (); | |
2358 | step_resume_breakpoint = | |
2359 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2360 | if (breakpoints_inserted) | |
2361 | insert_breakpoints (); | |
c5aa993b | 2362 | } |
c906108c | 2363 | |
488f131b JB |
2364 | keep_going (ecs); |
2365 | return; | |
2366 | } | |
c906108c | 2367 | |
488f131b JB |
2368 | /* We can't update step_sp every time through the loop, because |
2369 | reading the stack pointer would slow down stepping too much. | |
2370 | But we can update it every time we leave the step range. */ | |
2371 | ecs->update_step_sp = 1; | |
c906108c | 2372 | |
488f131b JB |
2373 | /* Did we just take a signal? */ |
2374 | if (PC_IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
2375 | && !PC_IN_SIGTRAMP (prev_pc, prev_func_name) | |
2376 | && INNER_THAN (read_sp (), step_sp)) | |
2377 | { | |
2378 | /* We've just taken a signal; go until we are back to | |
2379 | the point where we took it and one more. */ | |
c906108c | 2380 | |
488f131b JB |
2381 | /* Note: The test above succeeds not only when we stepped |
2382 | into a signal handler, but also when we step past the last | |
2383 | statement of a signal handler and end up in the return stub | |
2384 | of the signal handler trampoline. To distinguish between | |
2385 | these two cases, check that the frame is INNER_THAN the | |
2386 | previous one below. pai/1997-09-11 */ | |
c5aa993b | 2387 | |
c5aa993b | 2388 | |
c5aa993b | 2389 | { |
aa0cd9c1 | 2390 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
c906108c | 2391 | |
aa0cd9c1 | 2392 | if (frame_id_inner (current_frame, step_frame_id)) |
488f131b JB |
2393 | { |
2394 | /* We have just taken a signal; go until we are back to | |
2395 | the point where we took it and one more. */ | |
c906108c | 2396 | |
488f131b JB |
2397 | /* This code is needed at least in the following case: |
2398 | The user types "next" and then a signal arrives (before | |
2399 | the "next" is done). */ | |
d4f3574e | 2400 | |
488f131b JB |
2401 | /* Note that if we are stopped at a breakpoint, then we need |
2402 | the step_resume breakpoint to override any breakpoints at | |
2403 | the same location, so that we will still step over the | |
2404 | breakpoint even though the signal happened. */ | |
d4f3574e | 2405 | struct symtab_and_line sr_sal; |
d4f3574e | 2406 | |
fe39c653 | 2407 | init_sal (&sr_sal); |
488f131b JB |
2408 | sr_sal.symtab = NULL; |
2409 | sr_sal.line = 0; | |
2410 | sr_sal.pc = prev_pc; | |
2411 | /* We could probably be setting the frame to | |
aa0cd9c1 | 2412 | step_frame_id; I don't think anyone thought to try it. */ |
d4f3574e SS |
2413 | check_for_old_step_resume_breakpoint (); |
2414 | step_resume_breakpoint = | |
2415 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2416 | if (breakpoints_inserted) | |
2417 | insert_breakpoints (); | |
2418 | } | |
488f131b JB |
2419 | else |
2420 | { | |
2421 | /* We just stepped out of a signal handler and into | |
2422 | its calling trampoline. | |
2423 | ||
2424 | Normally, we'd call step_over_function from | |
2425 | here, but for some reason GDB can't unwind the | |
2426 | stack correctly to find the real PC for the point | |
2427 | user code where the signal trampoline will return | |
2428 | -- FRAME_SAVED_PC fails, at least on HP-UX 10.20. | |
2429 | But signal trampolines are pretty small stubs of | |
2430 | code, anyway, so it's OK instead to just | |
2431 | single-step out. Note: assuming such trampolines | |
2432 | don't exhibit recursion on any platform... */ | |
2433 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
2434 | &ecs->stop_func_start, | |
2435 | &ecs->stop_func_end); | |
2436 | /* Readjust stepping range */ | |
2437 | step_range_start = ecs->stop_func_start; | |
2438 | step_range_end = ecs->stop_func_end; | |
2439 | ecs->stepping_through_sigtramp = 1; | |
2440 | } | |
d4f3574e | 2441 | } |
c906108c | 2442 | |
c906108c | 2443 | |
488f131b JB |
2444 | /* If this is stepi or nexti, make sure that the stepping range |
2445 | gets us past that instruction. */ | |
2446 | if (step_range_end == 1) | |
2447 | /* FIXME: Does this run afoul of the code below which, if | |
2448 | we step into the middle of a line, resets the stepping | |
2449 | range? */ | |
2450 | step_range_end = (step_range_start = prev_pc) + 1; | |
2451 | ||
2452 | ecs->remove_breakpoints_on_following_step = 1; | |
2453 | keep_going (ecs); | |
2454 | return; | |
2455 | } | |
c906108c | 2456 | |
488f131b JB |
2457 | if (stop_pc == ecs->stop_func_start /* Quick test */ |
2458 | || (in_prologue (stop_pc, ecs->stop_func_start) && | |
2459 | !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2460 | || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name) | |
2461 | || ecs->stop_func_name == 0) | |
2462 | { | |
2463 | /* It's a subroutine call. */ | |
c906108c | 2464 | |
488f131b JB |
2465 | if ((step_over_calls == STEP_OVER_NONE) |
2466 | || ((step_range_end == 1) | |
2467 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
2468 | { | |
2469 | /* I presume that step_over_calls is only 0 when we're | |
2470 | supposed to be stepping at the assembly language level | |
2471 | ("stepi"). Just stop. */ | |
2472 | /* Also, maybe we just did a "nexti" inside a prolog, | |
2473 | so we thought it was a subroutine call but it was not. | |
2474 | Stop as well. FENN */ | |
2475 | stop_step = 1; | |
2476 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2477 | stop_stepping (ecs); | |
2478 | return; | |
2479 | } | |
c906108c | 2480 | |
488f131b | 2481 | if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc)) |
c5aa993b | 2482 | { |
488f131b JB |
2483 | /* We're doing a "next". */ |
2484 | ||
2485 | if (PC_IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
aa0cd9c1 AC |
2486 | && frame_id_inner (step_frame_id, |
2487 | frame_id_build (read_sp (), 0))) | |
488f131b JB |
2488 | /* We stepped out of a signal handler, and into its |
2489 | calling trampoline. This is misdetected as a | |
2490 | subroutine call, but stepping over the signal | |
aa0cd9c1 AC |
2491 | trampoline isn't such a bad idea. In order to do that, |
2492 | we have to ignore the value in step_frame_id, since | |
2493 | that doesn't represent the frame that'll reach when we | |
2494 | return from the signal trampoline. Otherwise we'll | |
2495 | probably continue to the end of the program. */ | |
2496 | step_frame_id = null_frame_id; | |
488f131b JB |
2497 | |
2498 | step_over_function (ecs); | |
2499 | keep_going (ecs); | |
2500 | return; | |
2501 | } | |
c906108c | 2502 | |
488f131b JB |
2503 | /* If we are in a function call trampoline (a stub between |
2504 | the calling routine and the real function), locate the real | |
2505 | function. That's what tells us (a) whether we want to step | |
2506 | into it at all, and (b) what prologue we want to run to | |
2507 | the end of, if we do step into it. */ | |
2508 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2509 | if (tmp != 0) | |
2510 | ecs->stop_func_start = tmp; | |
2511 | else | |
2512 | { | |
2513 | tmp = DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc); | |
2514 | if (tmp) | |
c5aa993b | 2515 | { |
488f131b JB |
2516 | struct symtab_and_line xxx; |
2517 | /* Why isn't this s_a_l called "sr_sal", like all of the | |
2518 | other s_a_l's where this code is duplicated? */ | |
fe39c653 | 2519 | init_sal (&xxx); /* initialize to zeroes */ |
488f131b JB |
2520 | xxx.pc = tmp; |
2521 | xxx.section = find_pc_overlay (xxx.pc); | |
a0b3c4fd | 2522 | check_for_old_step_resume_breakpoint (); |
c5aa993b | 2523 | step_resume_breakpoint = |
488f131b JB |
2524 | set_momentary_breakpoint (xxx, NULL, bp_step_resume); |
2525 | insert_breakpoints (); | |
2526 | keep_going (ecs); | |
2527 | return; | |
c906108c | 2528 | } |
c906108c SS |
2529 | } |
2530 | ||
488f131b JB |
2531 | /* If we have line number information for the function we |
2532 | are thinking of stepping into, step into it. | |
c906108c | 2533 | |
488f131b JB |
2534 | If there are several symtabs at that PC (e.g. with include |
2535 | files), just want to know whether *any* of them have line | |
2536 | numbers. find_pc_line handles this. */ | |
c5aa993b | 2537 | { |
488f131b | 2538 | struct symtab_and_line tmp_sal; |
c906108c | 2539 | |
488f131b JB |
2540 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2541 | if (tmp_sal.line != 0) | |
d4f3574e | 2542 | { |
488f131b | 2543 | step_into_function (ecs); |
d4f3574e SS |
2544 | return; |
2545 | } | |
488f131b | 2546 | } |
c5aa993b | 2547 | |
488f131b JB |
2548 | /* If we have no line number and the step-stop-if-no-debug |
2549 | is set, we stop the step so that the user has a chance to | |
2550 | switch in assembly mode. */ | |
2551 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) | |
c5aa993b | 2552 | { |
488f131b JB |
2553 | stop_step = 1; |
2554 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2555 | stop_stepping (ecs); | |
2556 | return; | |
c906108c | 2557 | } |
5fbbeb29 | 2558 | |
488f131b JB |
2559 | step_over_function (ecs); |
2560 | keep_going (ecs); | |
2561 | return; | |
c906108c | 2562 | |
488f131b | 2563 | } |
c906108c | 2564 | |
488f131b | 2565 | /* We've wandered out of the step range. */ |
c906108c | 2566 | |
488f131b | 2567 | ecs->sal = find_pc_line (stop_pc, 0); |
c906108c | 2568 | |
488f131b JB |
2569 | if (step_range_end == 1) |
2570 | { | |
2571 | /* It is stepi or nexti. We always want to stop stepping after | |
2572 | one instruction. */ | |
2573 | stop_step = 1; | |
2574 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2575 | stop_stepping (ecs); | |
2576 | return; | |
2577 | } | |
c906108c | 2578 | |
488f131b JB |
2579 | /* If we're in the return path from a shared library trampoline, |
2580 | we want to proceed through the trampoline when stepping. */ | |
2581 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2582 | { | |
2583 | CORE_ADDR tmp; | |
c906108c | 2584 | |
488f131b JB |
2585 | /* Determine where this trampoline returns. */ |
2586 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
c906108c | 2587 | |
488f131b JB |
2588 | /* Only proceed through if we know where it's going. */ |
2589 | if (tmp) | |
2590 | { | |
2591 | /* And put the step-breakpoint there and go until there. */ | |
2592 | struct symtab_and_line sr_sal; | |
2593 | ||
fe39c653 | 2594 | init_sal (&sr_sal); /* initialize to zeroes */ |
488f131b JB |
2595 | sr_sal.pc = tmp; |
2596 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2597 | /* Do not specify what the fp should be when we stop | |
2598 | since on some machines the prologue | |
2599 | is where the new fp value is established. */ | |
2600 | check_for_old_step_resume_breakpoint (); | |
2601 | step_resume_breakpoint = | |
2602 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2603 | if (breakpoints_inserted) | |
2604 | insert_breakpoints (); | |
c906108c | 2605 | |
488f131b JB |
2606 | /* Restart without fiddling with the step ranges or |
2607 | other state. */ | |
2608 | keep_going (ecs); | |
2609 | return; | |
2610 | } | |
2611 | } | |
c906108c | 2612 | |
488f131b JB |
2613 | if (ecs->sal.line == 0) |
2614 | { | |
2615 | /* We have no line number information. That means to stop | |
2616 | stepping (does this always happen right after one instruction, | |
2617 | when we do "s" in a function with no line numbers, | |
2618 | or can this happen as a result of a return or longjmp?). */ | |
2619 | stop_step = 1; | |
2620 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2621 | stop_stepping (ecs); | |
2622 | return; | |
2623 | } | |
c906108c | 2624 | |
488f131b JB |
2625 | if ((stop_pc == ecs->sal.pc) |
2626 | && (ecs->current_line != ecs->sal.line | |
2627 | || ecs->current_symtab != ecs->sal.symtab)) | |
2628 | { | |
2629 | /* We are at the start of a different line. So stop. Note that | |
2630 | we don't stop if we step into the middle of a different line. | |
2631 | That is said to make things like for (;;) statements work | |
2632 | better. */ | |
2633 | stop_step = 1; | |
2634 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2635 | stop_stepping (ecs); | |
2636 | return; | |
2637 | } | |
c906108c | 2638 | |
488f131b | 2639 | /* We aren't done stepping. |
c906108c | 2640 | |
488f131b JB |
2641 | Optimize by setting the stepping range to the line. |
2642 | (We might not be in the original line, but if we entered a | |
2643 | new line in mid-statement, we continue stepping. This makes | |
2644 | things like for(;;) statements work better.) */ | |
c906108c | 2645 | |
488f131b | 2646 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
c5aa993b | 2647 | { |
488f131b JB |
2648 | /* If this is the last line of the function, don't keep stepping |
2649 | (it would probably step us out of the function). | |
2650 | This is particularly necessary for a one-line function, | |
2651 | in which after skipping the prologue we better stop even though | |
2652 | we will be in mid-line. */ | |
2653 | stop_step = 1; | |
2654 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2655 | stop_stepping (ecs); | |
2656 | return; | |
c5aa993b | 2657 | } |
488f131b JB |
2658 | step_range_start = ecs->sal.pc; |
2659 | step_range_end = ecs->sal.end; | |
aa0cd9c1 | 2660 | step_frame_id = get_frame_id (get_current_frame ()); |
488f131b JB |
2661 | ecs->current_line = ecs->sal.line; |
2662 | ecs->current_symtab = ecs->sal.symtab; | |
2663 | ||
aa0cd9c1 AC |
2664 | /* In the case where we just stepped out of a function into the |
2665 | middle of a line of the caller, continue stepping, but | |
2666 | step_frame_id must be modified to current frame */ | |
488f131b | 2667 | { |
aa0cd9c1 AC |
2668 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
2669 | if (!(frame_id_inner (current_frame, step_frame_id))) | |
2670 | step_frame_id = current_frame; | |
488f131b | 2671 | } |
c906108c | 2672 | |
488f131b | 2673 | keep_going (ecs); |
104c1213 JM |
2674 | } |
2675 | ||
2676 | /* Are we in the middle of stepping? */ | |
2677 | ||
2678 | static int | |
2679 | currently_stepping (struct execution_control_state *ecs) | |
2680 | { | |
2681 | return ((through_sigtramp_breakpoint == NULL | |
2682 | && !ecs->handling_longjmp | |
2683 | && ((step_range_end && step_resume_breakpoint == NULL) | |
2684 | || trap_expected)) | |
2685 | || ecs->stepping_through_solib_after_catch | |
2686 | || bpstat_should_step ()); | |
2687 | } | |
c906108c | 2688 | |
104c1213 JM |
2689 | static void |
2690 | check_sigtramp2 (struct execution_control_state *ecs) | |
2691 | { | |
2692 | if (trap_expected | |
d7bd68ca AC |
2693 | && PC_IN_SIGTRAMP (stop_pc, ecs->stop_func_name) |
2694 | && !PC_IN_SIGTRAMP (prev_pc, prev_func_name) | |
104c1213 JM |
2695 | && INNER_THAN (read_sp (), step_sp)) |
2696 | { | |
2697 | /* What has happened here is that we have just stepped the | |
488f131b JB |
2698 | inferior with a signal (because it is a signal which |
2699 | shouldn't make us stop), thus stepping into sigtramp. | |
104c1213 | 2700 | |
488f131b JB |
2701 | So we need to set a step_resume_break_address breakpoint and |
2702 | continue until we hit it, and then step. FIXME: This should | |
2703 | be more enduring than a step_resume breakpoint; we should | |
2704 | know that we will later need to keep going rather than | |
2705 | re-hitting the breakpoint here (see the testsuite, | |
2706 | gdb.base/signals.exp where it says "exceedingly difficult"). */ | |
104c1213 JM |
2707 | |
2708 | struct symtab_and_line sr_sal; | |
2709 | ||
fe39c653 | 2710 | init_sal (&sr_sal); /* initialize to zeroes */ |
104c1213 JM |
2711 | sr_sal.pc = prev_pc; |
2712 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2713 | /* We perhaps could set the frame if we kept track of what the | |
488f131b | 2714 | frame corresponding to prev_pc was. But we don't, so don't. */ |
104c1213 JM |
2715 | through_sigtramp_breakpoint = |
2716 | set_momentary_breakpoint (sr_sal, NULL, bp_through_sigtramp); | |
2717 | if (breakpoints_inserted) | |
2718 | insert_breakpoints (); | |
cd0fc7c3 | 2719 | |
104c1213 JM |
2720 | ecs->remove_breakpoints_on_following_step = 1; |
2721 | ecs->another_trap = 1; | |
2722 | } | |
2723 | } | |
2724 | ||
c2c6d25f JM |
2725 | /* Subroutine call with source code we should not step over. Do step |
2726 | to the first line of code in it. */ | |
2727 | ||
2728 | static void | |
2729 | step_into_function (struct execution_control_state *ecs) | |
2730 | { | |
2731 | struct symtab *s; | |
2732 | struct symtab_and_line sr_sal; | |
2733 | ||
2734 | s = find_pc_symtab (stop_pc); | |
2735 | if (s && s->language != language_asm) | |
2736 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
2737 | ||
2738 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2739 | /* Use the step_resume_break to step until the end of the prologue, | |
2740 | even if that involves jumps (as it seems to on the vax under | |
2741 | 4.2). */ | |
2742 | /* If the prologue ends in the middle of a source line, continue to | |
2743 | the end of that source line (if it is still within the function). | |
2744 | Otherwise, just go to end of prologue. */ | |
2745 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP | |
2746 | /* no, don't either. It skips any code that's legitimately on the | |
2747 | first line. */ | |
2748 | #else | |
2749 | if (ecs->sal.end | |
2750 | && ecs->sal.pc != ecs->stop_func_start | |
2751 | && ecs->sal.end < ecs->stop_func_end) | |
2752 | ecs->stop_func_start = ecs->sal.end; | |
2753 | #endif | |
2754 | ||
2755 | if (ecs->stop_func_start == stop_pc) | |
2756 | { | |
2757 | /* We are already there: stop now. */ | |
2758 | stop_step = 1; | |
488f131b | 2759 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2760 | stop_stepping (ecs); |
2761 | return; | |
2762 | } | |
2763 | else | |
2764 | { | |
2765 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 2766 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
2767 | sr_sal.pc = ecs->stop_func_start; |
2768 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
2769 | /* Do not specify what the fp should be when we stop since on | |
488f131b JB |
2770 | some machines the prologue is where the new fp value is |
2771 | established. */ | |
c2c6d25f JM |
2772 | check_for_old_step_resume_breakpoint (); |
2773 | step_resume_breakpoint = | |
2774 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2775 | if (breakpoints_inserted) | |
2776 | insert_breakpoints (); | |
2777 | ||
2778 | /* And make sure stepping stops right away then. */ | |
2779 | step_range_end = step_range_start; | |
2780 | } | |
2781 | keep_going (ecs); | |
2782 | } | |
d4f3574e SS |
2783 | |
2784 | /* We've just entered a callee, and we wish to resume until it returns | |
2785 | to the caller. Setting a step_resume breakpoint on the return | |
2786 | address will catch a return from the callee. | |
2787 | ||
2788 | However, if the callee is recursing, we want to be careful not to | |
2789 | catch returns of those recursive calls, but only of THIS instance | |
2790 | of the call. | |
2791 | ||
2792 | To do this, we set the step_resume bp's frame to our current | |
aa0cd9c1 | 2793 | caller's frame (step_frame_id, which is set by the "next" or |
d4f3574e SS |
2794 | "until" command, before execution begins). */ |
2795 | ||
2796 | static void | |
2797 | step_over_function (struct execution_control_state *ecs) | |
2798 | { | |
2799 | struct symtab_and_line sr_sal; | |
2800 | ||
fe39c653 | 2801 | init_sal (&sr_sal); /* initialize to zeros */ |
d4f3574e SS |
2802 | sr_sal.pc = ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ())); |
2803 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2804 | ||
2805 | check_for_old_step_resume_breakpoint (); | |
2806 | step_resume_breakpoint = | |
2807 | set_momentary_breakpoint (sr_sal, get_current_frame (), bp_step_resume); | |
2808 | ||
aa0cd9c1 AC |
2809 | if (frame_id_p (step_frame_id) |
2810 | && !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc)) | |
2811 | /* FIXME: cagney/2002-12-01: Someone should modify the breakpoint | |
2812 | code so that it uses a frame ID, instead of a frame address. */ | |
2813 | step_resume_breakpoint->frame = step_frame_id.base; | |
d4f3574e SS |
2814 | |
2815 | if (breakpoints_inserted) | |
2816 | insert_breakpoints (); | |
2817 | } | |
2818 | ||
104c1213 JM |
2819 | static void |
2820 | stop_stepping (struct execution_control_state *ecs) | |
2821 | { | |
c906108c SS |
2822 | if (target_has_execution) |
2823 | { | |
2824 | /* Are we stopping for a vfork event? We only stop when we see | |
2825 | the child's event. However, we may not yet have seen the | |
39f77062 | 2826 | parent's event. And, inferior_ptid is still set to the |
104c1213 JM |
2827 | parent's pid, until we resume again and follow either the |
2828 | parent or child. | |
c906108c | 2829 | |
39f77062 | 2830 | To ensure that we can really touch inferior_ptid (aka, the |
c906108c SS |
2831 | parent process) -- which calls to functions like read_pc |
2832 | implicitly do -- wait on the parent if necessary. */ | |
2833 | if ((pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
2834 | && !pending_follow.fork_event.saw_parent_fork) | |
2835 | { | |
39f77062 | 2836 | ptid_t parent_ptid; |
c906108c SS |
2837 | |
2838 | do | |
2839 | { | |
2840 | if (target_wait_hook) | |
39f77062 | 2841 | parent_ptid = target_wait_hook (pid_to_ptid (-1), &(ecs->ws)); |
c906108c | 2842 | else |
39f77062 | 2843 | parent_ptid = target_wait (pid_to_ptid (-1), &(ecs->ws)); |
c906108c | 2844 | } |
488f131b | 2845 | while (!ptid_equal (parent_ptid, inferior_ptid)); |
c906108c SS |
2846 | } |
2847 | ||
c906108c | 2848 | /* Assuming the inferior still exists, set these up for next |
c5aa993b JM |
2849 | time, just like we did above if we didn't break out of the |
2850 | loop. */ | |
c906108c | 2851 | prev_pc = read_pc (); |
cd0fc7c3 SS |
2852 | prev_func_start = ecs->stop_func_start; |
2853 | prev_func_name = ecs->stop_func_name; | |
c906108c | 2854 | } |
104c1213 | 2855 | |
cd0fc7c3 SS |
2856 | /* Let callers know we don't want to wait for the inferior anymore. */ |
2857 | ecs->wait_some_more = 0; | |
2858 | } | |
2859 | ||
d4f3574e SS |
2860 | /* This function handles various cases where we need to continue |
2861 | waiting for the inferior. */ | |
2862 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
2863 | ||
2864 | static void | |
2865 | keep_going (struct execution_control_state *ecs) | |
2866 | { | |
d4f3574e | 2867 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 2868 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e SS |
2869 | prev_func_start = ecs->stop_func_start; /* Ok, since if DECR_PC_AFTER |
2870 | BREAK is defined, the | |
2871 | original pc would not have | |
2872 | been at the start of a | |
2873 | function. */ | |
2874 | prev_func_name = ecs->stop_func_name; | |
2875 | ||
2876 | if (ecs->update_step_sp) | |
2877 | step_sp = read_sp (); | |
2878 | ecs->update_step_sp = 0; | |
2879 | ||
2880 | /* If we did not do break;, it means we should keep running the | |
2881 | inferior and not return to debugger. */ | |
2882 | ||
2883 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
2884 | { | |
2885 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
2886 | the inferior, else we'd have done a break above) and we |
2887 | haven't yet gotten our trap. Simply continue. */ | |
d4f3574e SS |
2888 | resume (currently_stepping (ecs), stop_signal); |
2889 | } | |
2890 | else | |
2891 | { | |
2892 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
2893 | anyway (the user asked that this signal be passed to the |
2894 | child) | |
2895 | -- or -- | |
2896 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2897 | decided we should resume from it. | |
d4f3574e | 2898 | |
488f131b | 2899 | We're going to run this baby now! |
d4f3574e | 2900 | |
488f131b JB |
2901 | Insert breakpoints now, unless we are trying to one-proceed |
2902 | past a breakpoint. */ | |
d4f3574e | 2903 | /* If we've just finished a special step resume and we don't |
488f131b | 2904 | want to hit a breakpoint, pull em out. */ |
d4f3574e SS |
2905 | if (step_resume_breakpoint == NULL |
2906 | && through_sigtramp_breakpoint == NULL | |
2907 | && ecs->remove_breakpoints_on_following_step) | |
2908 | { | |
2909 | ecs->remove_breakpoints_on_following_step = 0; | |
2910 | remove_breakpoints (); | |
2911 | breakpoints_inserted = 0; | |
2912 | } | |
2913 | else if (!breakpoints_inserted && | |
2914 | (through_sigtramp_breakpoint != NULL || !ecs->another_trap)) | |
2915 | { | |
2916 | breakpoints_failed = insert_breakpoints (); | |
2917 | if (breakpoints_failed) | |
2918 | { | |
2919 | stop_stepping (ecs); | |
2920 | return; | |
2921 | } | |
2922 | breakpoints_inserted = 1; | |
2923 | } | |
2924 | ||
2925 | trap_expected = ecs->another_trap; | |
2926 | ||
2927 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
2928 | specifies that such a signal should be delivered to the |
2929 | target program). | |
2930 | ||
2931 | Typically, this would occure when a user is debugging a | |
2932 | target monitor on a simulator: the target monitor sets a | |
2933 | breakpoint; the simulator encounters this break-point and | |
2934 | halts the simulation handing control to GDB; GDB, noteing | |
2935 | that the break-point isn't valid, returns control back to the | |
2936 | simulator; the simulator then delivers the hardware | |
2937 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
2938 | ||
2939 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
2940 | stop_signal = TARGET_SIGNAL_0; |
2941 | ||
2942 | #ifdef SHIFT_INST_REGS | |
2943 | /* I'm not sure when this following segment applies. I do know, | |
488f131b JB |
2944 | now, that we shouldn't rewrite the regs when we were stopped |
2945 | by a random signal from the inferior process. */ | |
d4f3574e | 2946 | /* FIXME: Shouldn't this be based on the valid bit of the SXIP? |
488f131b | 2947 | (this is only used on the 88k). */ |
d4f3574e SS |
2948 | |
2949 | if (!bpstat_explains_signal (stop_bpstat) | |
488f131b | 2950 | && (stop_signal != TARGET_SIGNAL_CHLD) && !stopped_by_random_signal) |
d4f3574e SS |
2951 | SHIFT_INST_REGS (); |
2952 | #endif /* SHIFT_INST_REGS */ | |
2953 | ||
2954 | resume (currently_stepping (ecs), stop_signal); | |
2955 | } | |
2956 | ||
488f131b | 2957 | prepare_to_wait (ecs); |
d4f3574e SS |
2958 | } |
2959 | ||
104c1213 JM |
2960 | /* This function normally comes after a resume, before |
2961 | handle_inferior_event exits. It takes care of any last bits of | |
2962 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 2963 | |
104c1213 JM |
2964 | static void |
2965 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 2966 | { |
104c1213 JM |
2967 | if (ecs->infwait_state == infwait_normal_state) |
2968 | { | |
2969 | overlay_cache_invalid = 1; | |
2970 | ||
2971 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
2972 | target_wait because they can be loaded from the target while |
2973 | in target_wait. This makes remote debugging a bit more | |
2974 | efficient for those targets that provide critical registers | |
2975 | as part of their normal status mechanism. */ | |
104c1213 JM |
2976 | |
2977 | registers_changed (); | |
39f77062 | 2978 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
2979 | ecs->wp = &(ecs->ws); |
2980 | } | |
2981 | /* This is the old end of the while loop. Let everybody know we | |
2982 | want to wait for the inferior some more and get called again | |
2983 | soon. */ | |
2984 | ecs->wait_some_more = 1; | |
c906108c | 2985 | } |
11cf8741 JM |
2986 | |
2987 | /* Print why the inferior has stopped. We always print something when | |
2988 | the inferior exits, or receives a signal. The rest of the cases are | |
2989 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
2990 | there should be a call to this function from handle_inferior_event() | |
2991 | each time stop_stepping() is called.*/ | |
2992 | static void | |
2993 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
2994 | { | |
2995 | switch (stop_reason) | |
2996 | { | |
2997 | case STOP_UNKNOWN: | |
2998 | /* We don't deal with these cases from handle_inferior_event() | |
2999 | yet. */ | |
3000 | break; | |
3001 | case END_STEPPING_RANGE: | |
3002 | /* We are done with a step/next/si/ni command. */ | |
3003 | /* For now print nothing. */ | |
fb40c209 | 3004 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 3005 | operation for n > 1 */ |
fb40c209 | 3006 | if (!step_multi || !stop_step) |
9dc5e2a9 | 3007 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3008 | ui_out_field_string (uiout, "reason", "end-stepping-range"); |
11cf8741 JM |
3009 | break; |
3010 | case BREAKPOINT_HIT: | |
3011 | /* We found a breakpoint. */ | |
3012 | /* For now print nothing. */ | |
3013 | break; | |
3014 | case SIGNAL_EXITED: | |
3015 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 3016 | annotate_signalled (); |
9dc5e2a9 | 3017 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3018 | ui_out_field_string (uiout, "reason", "exited-signalled"); |
8b93c638 JM |
3019 | ui_out_text (uiout, "\nProgram terminated with signal "); |
3020 | annotate_signal_name (); | |
488f131b JB |
3021 | ui_out_field_string (uiout, "signal-name", |
3022 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
3023 | annotate_signal_name_end (); |
3024 | ui_out_text (uiout, ", "); | |
3025 | annotate_signal_string (); | |
488f131b JB |
3026 | ui_out_field_string (uiout, "signal-meaning", |
3027 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
3028 | annotate_signal_string_end (); |
3029 | ui_out_text (uiout, ".\n"); | |
3030 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
3031 | break; |
3032 | case EXITED: | |
3033 | /* The inferior program is finished. */ | |
8b93c638 JM |
3034 | annotate_exited (stop_info); |
3035 | if (stop_info) | |
3036 | { | |
9dc5e2a9 | 3037 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3038 | ui_out_field_string (uiout, "reason", "exited"); |
8b93c638 | 3039 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
3040 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
3041 | (unsigned int) stop_info); | |
8b93c638 JM |
3042 | ui_out_text (uiout, ".\n"); |
3043 | } | |
3044 | else | |
3045 | { | |
9dc5e2a9 | 3046 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3047 | ui_out_field_string (uiout, "reason", "exited-normally"); |
8b93c638 JM |
3048 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
3049 | } | |
11cf8741 JM |
3050 | break; |
3051 | case SIGNAL_RECEIVED: | |
3052 | /* Signal received. The signal table tells us to print about | |
3053 | it. */ | |
8b93c638 JM |
3054 | annotate_signal (); |
3055 | ui_out_text (uiout, "\nProgram received signal "); | |
3056 | annotate_signal_name (); | |
84c6c83c KS |
3057 | if (ui_out_is_mi_like_p (uiout)) |
3058 | ui_out_field_string (uiout, "reason", "signal-received"); | |
488f131b JB |
3059 | ui_out_field_string (uiout, "signal-name", |
3060 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
3061 | annotate_signal_name_end (); |
3062 | ui_out_text (uiout, ", "); | |
3063 | annotate_signal_string (); | |
488f131b JB |
3064 | ui_out_field_string (uiout, "signal-meaning", |
3065 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
3066 | annotate_signal_string_end (); |
3067 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
3068 | break; |
3069 | default: | |
8e65ff28 AC |
3070 | internal_error (__FILE__, __LINE__, |
3071 | "print_stop_reason: unrecognized enum value"); | |
11cf8741 JM |
3072 | break; |
3073 | } | |
3074 | } | |
c906108c | 3075 | \f |
43ff13b4 | 3076 | |
c906108c SS |
3077 | /* Here to return control to GDB when the inferior stops for real. |
3078 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
3079 | ||
3080 | STOP_PRINT_FRAME nonzero means print the executing frame | |
3081 | (pc, function, args, file, line number and line text). | |
3082 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
3083 | attempting to insert breakpoints. */ | |
3084 | ||
3085 | void | |
96baa820 | 3086 | normal_stop (void) |
c906108c | 3087 | { |
c906108c SS |
3088 | /* As with the notification of thread events, we want to delay |
3089 | notifying the user that we've switched thread context until | |
3090 | the inferior actually stops. | |
3091 | ||
3092 | (Note that there's no point in saying anything if the inferior | |
3093 | has exited!) */ | |
488f131b | 3094 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
7a292a7a | 3095 | && target_has_execution) |
c906108c SS |
3096 | { |
3097 | target_terminal_ours_for_output (); | |
c3f6f71d | 3098 | printf_filtered ("[Switching to %s]\n", |
39f77062 KB |
3099 | target_pid_or_tid_to_str (inferior_ptid)); |
3100 | previous_inferior_ptid = inferior_ptid; | |
c906108c | 3101 | } |
c906108c SS |
3102 | |
3103 | /* Make sure that the current_frame's pc is correct. This | |
3104 | is a correction for setting up the frame info before doing | |
3105 | DECR_PC_AFTER_BREAK */ | |
3106 | if (target_has_execution && get_current_frame ()) | |
3107 | (get_current_frame ())->pc = read_pc (); | |
3108 | ||
c906108c SS |
3109 | if (target_has_execution && breakpoints_inserted) |
3110 | { | |
3111 | if (remove_breakpoints ()) | |
3112 | { | |
3113 | target_terminal_ours_for_output (); | |
3114 | printf_filtered ("Cannot remove breakpoints because "); | |
3115 | printf_filtered ("program is no longer writable.\n"); | |
3116 | printf_filtered ("It might be running in another process.\n"); | |
3117 | printf_filtered ("Further execution is probably impossible.\n"); | |
3118 | } | |
3119 | } | |
3120 | breakpoints_inserted = 0; | |
3121 | ||
3122 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3123 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3124 | ||
3125 | breakpoint_auto_delete (stop_bpstat); | |
3126 | ||
3127 | /* If an auto-display called a function and that got a signal, | |
3128 | delete that auto-display to avoid an infinite recursion. */ | |
3129 | ||
3130 | if (stopped_by_random_signal) | |
3131 | disable_current_display (); | |
3132 | ||
3133 | /* Don't print a message if in the middle of doing a "step n" | |
3134 | operation for n > 1 */ | |
3135 | if (step_multi && stop_step) | |
3136 | goto done; | |
3137 | ||
3138 | target_terminal_ours (); | |
3139 | ||
5913bcb0 AC |
3140 | /* Look up the hook_stop and run it (CLI internally handles problem |
3141 | of stop_command's pre-hook not existing). */ | |
3142 | if (stop_command) | |
3143 | catch_errors (hook_stop_stub, stop_command, | |
3144 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
3145 | |
3146 | if (!target_has_stack) | |
3147 | { | |
3148 | ||
3149 | goto done; | |
3150 | } | |
3151 | ||
3152 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3153 | and current location is based on that. | |
3154 | Don't do this on return from a stack dummy routine, | |
3155 | or if the program has exited. */ | |
3156 | ||
3157 | if (!stop_stack_dummy) | |
3158 | { | |
0f7d239c | 3159 | select_frame (get_current_frame ()); |
c906108c SS |
3160 | |
3161 | /* Print current location without a level number, if | |
c5aa993b JM |
3162 | we have changed functions or hit a breakpoint. |
3163 | Print source line if we have one. | |
3164 | bpstat_print() contains the logic deciding in detail | |
3165 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3166 | |
6e7f8b9c | 3167 | if (stop_print_frame && deprecated_selected_frame) |
c906108c SS |
3168 | { |
3169 | int bpstat_ret; | |
3170 | int source_flag; | |
917317f4 | 3171 | int do_frame_printing = 1; |
c906108c SS |
3172 | |
3173 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3174 | switch (bpstat_ret) |
3175 | { | |
3176 | case PRINT_UNKNOWN: | |
aa0cd9c1 AC |
3177 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
3178 | (or should) carry around the function and does (or | |
3179 | should) use that when doing a frame comparison. */ | |
917317f4 | 3180 | if (stop_step |
aa0cd9c1 AC |
3181 | && frame_id_eq (step_frame_id, |
3182 | get_frame_id (get_current_frame ())) | |
917317f4 | 3183 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3184 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3185 | else |
488f131b | 3186 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3187 | break; |
3188 | case PRINT_SRC_AND_LOC: | |
488f131b | 3189 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3190 | break; |
3191 | case PRINT_SRC_ONLY: | |
c5394b80 | 3192 | source_flag = SRC_LINE; |
917317f4 JM |
3193 | break; |
3194 | case PRINT_NOTHING: | |
488f131b | 3195 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3196 | do_frame_printing = 0; |
3197 | break; | |
3198 | default: | |
488f131b | 3199 | internal_error (__FILE__, __LINE__, "Unknown value."); |
917317f4 | 3200 | } |
fb40c209 | 3201 | /* For mi, have the same behavior every time we stop: |
488f131b | 3202 | print everything but the source line. */ |
9dc5e2a9 | 3203 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3204 | source_flag = LOC_AND_ADDRESS; |
c906108c | 3205 | |
9dc5e2a9 | 3206 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 | 3207 | ui_out_field_int (uiout, "thread-id", |
488f131b | 3208 | pid_to_thread_id (inferior_ptid)); |
c906108c SS |
3209 | /* The behavior of this routine with respect to the source |
3210 | flag is: | |
c5394b80 JM |
3211 | SRC_LINE: Print only source line |
3212 | LOCATION: Print only location | |
3213 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3214 | if (do_frame_printing) |
6e7f8b9c | 3215 | show_and_print_stack_frame (deprecated_selected_frame, -1, source_flag); |
c906108c SS |
3216 | |
3217 | /* Display the auto-display expressions. */ | |
3218 | do_displays (); | |
3219 | } | |
3220 | } | |
3221 | ||
3222 | /* Save the function value return registers, if we care. | |
3223 | We might be about to restore their previous contents. */ | |
3224 | if (proceed_to_finish) | |
72cec141 AC |
3225 | /* NB: The copy goes through to the target picking up the value of |
3226 | all the registers. */ | |
3227 | regcache_cpy (stop_registers, current_regcache); | |
c906108c SS |
3228 | |
3229 | if (stop_stack_dummy) | |
3230 | { | |
3231 | /* Pop the empty frame that contains the stack dummy. | |
3232 | POP_FRAME ends with a setting of the current frame, so we | |
c5aa993b | 3233 | can use that next. */ |
c906108c SS |
3234 | POP_FRAME; |
3235 | /* Set stop_pc to what it was before we called the function. | |
c5aa993b JM |
3236 | Can't rely on restore_inferior_status because that only gets |
3237 | called if we don't stop in the called function. */ | |
c906108c | 3238 | stop_pc = read_pc (); |
0f7d239c | 3239 | select_frame (get_current_frame ()); |
c906108c SS |
3240 | } |
3241 | ||
c906108c SS |
3242 | done: |
3243 | annotate_stopped (); | |
3244 | } | |
3245 | ||
3246 | static int | |
96baa820 | 3247 | hook_stop_stub (void *cmd) |
c906108c | 3248 | { |
5913bcb0 | 3249 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3250 | return (0); |
3251 | } | |
3252 | \f | |
c5aa993b | 3253 | int |
96baa820 | 3254 | signal_stop_state (int signo) |
c906108c SS |
3255 | { |
3256 | return signal_stop[signo]; | |
3257 | } | |
3258 | ||
c5aa993b | 3259 | int |
96baa820 | 3260 | signal_print_state (int signo) |
c906108c SS |
3261 | { |
3262 | return signal_print[signo]; | |
3263 | } | |
3264 | ||
c5aa993b | 3265 | int |
96baa820 | 3266 | signal_pass_state (int signo) |
c906108c SS |
3267 | { |
3268 | return signal_program[signo]; | |
3269 | } | |
3270 | ||
488f131b | 3271 | int |
7bda5e4a | 3272 | signal_stop_update (int signo, int state) |
d4f3574e SS |
3273 | { |
3274 | int ret = signal_stop[signo]; | |
3275 | signal_stop[signo] = state; | |
3276 | return ret; | |
3277 | } | |
3278 | ||
488f131b | 3279 | int |
7bda5e4a | 3280 | signal_print_update (int signo, int state) |
d4f3574e SS |
3281 | { |
3282 | int ret = signal_print[signo]; | |
3283 | signal_print[signo] = state; | |
3284 | return ret; | |
3285 | } | |
3286 | ||
488f131b | 3287 | int |
7bda5e4a | 3288 | signal_pass_update (int signo, int state) |
d4f3574e SS |
3289 | { |
3290 | int ret = signal_program[signo]; | |
3291 | signal_program[signo] = state; | |
3292 | return ret; | |
3293 | } | |
3294 | ||
c906108c | 3295 | static void |
96baa820 | 3296 | sig_print_header (void) |
c906108c SS |
3297 | { |
3298 | printf_filtered ("\ | |
3299 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3300 | } | |
3301 | ||
3302 | static void | |
96baa820 | 3303 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3304 | { |
3305 | char *name = target_signal_to_name (oursig); | |
3306 | int name_padding = 13 - strlen (name); | |
96baa820 | 3307 | |
c906108c SS |
3308 | if (name_padding <= 0) |
3309 | name_padding = 0; | |
3310 | ||
3311 | printf_filtered ("%s", name); | |
488f131b | 3312 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
3313 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3314 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3315 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3316 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3317 | } | |
3318 | ||
3319 | /* Specify how various signals in the inferior should be handled. */ | |
3320 | ||
3321 | static void | |
96baa820 | 3322 | handle_command (char *args, int from_tty) |
c906108c SS |
3323 | { |
3324 | char **argv; | |
3325 | int digits, wordlen; | |
3326 | int sigfirst, signum, siglast; | |
3327 | enum target_signal oursig; | |
3328 | int allsigs; | |
3329 | int nsigs; | |
3330 | unsigned char *sigs; | |
3331 | struct cleanup *old_chain; | |
3332 | ||
3333 | if (args == NULL) | |
3334 | { | |
3335 | error_no_arg ("signal to handle"); | |
3336 | } | |
3337 | ||
3338 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3339 | ||
3340 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3341 | sigs = (unsigned char *) alloca (nsigs); | |
3342 | memset (sigs, 0, nsigs); | |
3343 | ||
3344 | /* Break the command line up into args. */ | |
3345 | ||
3346 | argv = buildargv (args); | |
3347 | if (argv == NULL) | |
3348 | { | |
3349 | nomem (0); | |
3350 | } | |
7a292a7a | 3351 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3352 | |
3353 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3354 | actions. Signal numbers and signal names may be interspersed with | |
3355 | actions, with the actions being performed for all signals cumulatively | |
3356 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3357 | ||
3358 | while (*argv != NULL) | |
3359 | { | |
3360 | wordlen = strlen (*argv); | |
3361 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3362 | {; | |
3363 | } | |
3364 | allsigs = 0; | |
3365 | sigfirst = siglast = -1; | |
3366 | ||
3367 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3368 | { | |
3369 | /* Apply action to all signals except those used by the | |
3370 | debugger. Silently skip those. */ | |
3371 | allsigs = 1; | |
3372 | sigfirst = 0; | |
3373 | siglast = nsigs - 1; | |
3374 | } | |
3375 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3376 | { | |
3377 | SET_SIGS (nsigs, sigs, signal_stop); | |
3378 | SET_SIGS (nsigs, sigs, signal_print); | |
3379 | } | |
3380 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3381 | { | |
3382 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3383 | } | |
3384 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3385 | { | |
3386 | SET_SIGS (nsigs, sigs, signal_print); | |
3387 | } | |
3388 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3389 | { | |
3390 | SET_SIGS (nsigs, sigs, signal_program); | |
3391 | } | |
3392 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3393 | { | |
3394 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3395 | } | |
3396 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3397 | { | |
3398 | SET_SIGS (nsigs, sigs, signal_program); | |
3399 | } | |
3400 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3401 | { | |
3402 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3403 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3404 | } | |
3405 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3406 | { | |
3407 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3408 | } | |
3409 | else if (digits > 0) | |
3410 | { | |
3411 | /* It is numeric. The numeric signal refers to our own | |
3412 | internal signal numbering from target.h, not to host/target | |
3413 | signal number. This is a feature; users really should be | |
3414 | using symbolic names anyway, and the common ones like | |
3415 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3416 | ||
3417 | sigfirst = siglast = (int) | |
3418 | target_signal_from_command (atoi (*argv)); | |
3419 | if ((*argv)[digits] == '-') | |
3420 | { | |
3421 | siglast = (int) | |
3422 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3423 | } | |
3424 | if (sigfirst > siglast) | |
3425 | { | |
3426 | /* Bet he didn't figure we'd think of this case... */ | |
3427 | signum = sigfirst; | |
3428 | sigfirst = siglast; | |
3429 | siglast = signum; | |
3430 | } | |
3431 | } | |
3432 | else | |
3433 | { | |
3434 | oursig = target_signal_from_name (*argv); | |
3435 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3436 | { | |
3437 | sigfirst = siglast = (int) oursig; | |
3438 | } | |
3439 | else | |
3440 | { | |
3441 | /* Not a number and not a recognized flag word => complain. */ | |
3442 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3443 | } | |
3444 | } | |
3445 | ||
3446 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3447 | which signals to apply actions to. */ |
c906108c SS |
3448 | |
3449 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3450 | { | |
3451 | switch ((enum target_signal) signum) | |
3452 | { | |
3453 | case TARGET_SIGNAL_TRAP: | |
3454 | case TARGET_SIGNAL_INT: | |
3455 | if (!allsigs && !sigs[signum]) | |
3456 | { | |
3457 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 3458 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
3459 | { |
3460 | sigs[signum] = 1; | |
3461 | } | |
3462 | else | |
3463 | { | |
3464 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3465 | gdb_flush (gdb_stdout); | |
3466 | } | |
3467 | } | |
3468 | break; | |
3469 | case TARGET_SIGNAL_0: | |
3470 | case TARGET_SIGNAL_DEFAULT: | |
3471 | case TARGET_SIGNAL_UNKNOWN: | |
3472 | /* Make sure that "all" doesn't print these. */ | |
3473 | break; | |
3474 | default: | |
3475 | sigs[signum] = 1; | |
3476 | break; | |
3477 | } | |
3478 | } | |
3479 | ||
3480 | argv++; | |
3481 | } | |
3482 | ||
39f77062 | 3483 | target_notice_signals (inferior_ptid); |
c906108c SS |
3484 | |
3485 | if (from_tty) | |
3486 | { | |
3487 | /* Show the results. */ | |
3488 | sig_print_header (); | |
3489 | for (signum = 0; signum < nsigs; signum++) | |
3490 | { | |
3491 | if (sigs[signum]) | |
3492 | { | |
3493 | sig_print_info (signum); | |
3494 | } | |
3495 | } | |
3496 | } | |
3497 | ||
3498 | do_cleanups (old_chain); | |
3499 | } | |
3500 | ||
3501 | static void | |
96baa820 | 3502 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3503 | { |
3504 | char **argv; | |
3505 | struct cleanup *old_chain; | |
3506 | ||
3507 | /* Break the command line up into args. */ | |
3508 | ||
3509 | argv = buildargv (args); | |
3510 | if (argv == NULL) | |
3511 | { | |
3512 | nomem (0); | |
3513 | } | |
7a292a7a | 3514 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3515 | if (argv[1] != (char *) NULL) |
3516 | { | |
3517 | char *argBuf; | |
3518 | int bufLen; | |
3519 | ||
3520 | bufLen = strlen (argv[0]) + 20; | |
3521 | argBuf = (char *) xmalloc (bufLen); | |
3522 | if (argBuf) | |
3523 | { | |
3524 | int validFlag = 1; | |
3525 | enum target_signal oursig; | |
3526 | ||
3527 | oursig = target_signal_from_name (argv[0]); | |
3528 | memset (argBuf, 0, bufLen); | |
3529 | if (strcmp (argv[1], "Q") == 0) | |
3530 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3531 | else | |
3532 | { | |
3533 | if (strcmp (argv[1], "s") == 0) | |
3534 | { | |
3535 | if (!signal_stop[oursig]) | |
3536 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3537 | else | |
3538 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3539 | } | |
3540 | else if (strcmp (argv[1], "i") == 0) | |
3541 | { | |
3542 | if (!signal_program[oursig]) | |
3543 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3544 | else | |
3545 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3546 | } | |
3547 | else if (strcmp (argv[1], "r") == 0) | |
3548 | { | |
3549 | if (!signal_print[oursig]) | |
3550 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3551 | else | |
3552 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3553 | } | |
3554 | else | |
3555 | validFlag = 0; | |
3556 | } | |
3557 | if (validFlag) | |
3558 | handle_command (argBuf, from_tty); | |
3559 | else | |
3560 | printf_filtered ("Invalid signal handling flag.\n"); | |
3561 | if (argBuf) | |
b8c9b27d | 3562 | xfree (argBuf); |
c906108c SS |
3563 | } |
3564 | } | |
3565 | do_cleanups (old_chain); | |
3566 | } | |
3567 | ||
3568 | /* Print current contents of the tables set by the handle command. | |
3569 | It is possible we should just be printing signals actually used | |
3570 | by the current target (but for things to work right when switching | |
3571 | targets, all signals should be in the signal tables). */ | |
3572 | ||
3573 | static void | |
96baa820 | 3574 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3575 | { |
3576 | enum target_signal oursig; | |
3577 | sig_print_header (); | |
3578 | ||
3579 | if (signum_exp) | |
3580 | { | |
3581 | /* First see if this is a symbol name. */ | |
3582 | oursig = target_signal_from_name (signum_exp); | |
3583 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3584 | { | |
3585 | /* No, try numeric. */ | |
3586 | oursig = | |
bb518678 | 3587 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3588 | } |
3589 | sig_print_info (oursig); | |
3590 | return; | |
3591 | } | |
3592 | ||
3593 | printf_filtered ("\n"); | |
3594 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3595 | for (oursig = TARGET_SIGNAL_FIRST; | |
3596 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3597 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3598 | { | |
3599 | QUIT; | |
3600 | ||
3601 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 3602 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
3603 | sig_print_info (oursig); |
3604 | } | |
3605 | ||
3606 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3607 | } | |
3608 | \f | |
7a292a7a SS |
3609 | struct inferior_status |
3610 | { | |
3611 | enum target_signal stop_signal; | |
3612 | CORE_ADDR stop_pc; | |
3613 | bpstat stop_bpstat; | |
3614 | int stop_step; | |
3615 | int stop_stack_dummy; | |
3616 | int stopped_by_random_signal; | |
3617 | int trap_expected; | |
3618 | CORE_ADDR step_range_start; | |
3619 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 3620 | struct frame_id step_frame_id; |
5fbbeb29 | 3621 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3622 | CORE_ADDR step_resume_break_address; |
3623 | int stop_after_trap; | |
3624 | int stop_soon_quietly; | |
72cec141 | 3625 | struct regcache *stop_registers; |
7a292a7a SS |
3626 | |
3627 | /* These are here because if call_function_by_hand has written some | |
3628 | registers and then decides to call error(), we better not have changed | |
3629 | any registers. */ | |
72cec141 | 3630 | struct regcache *registers; |
7a292a7a | 3631 | |
101dcfbe AC |
3632 | /* A frame unique identifier. */ |
3633 | struct frame_id selected_frame_id; | |
3634 | ||
7a292a7a SS |
3635 | int breakpoint_proceeded; |
3636 | int restore_stack_info; | |
3637 | int proceed_to_finish; | |
3638 | }; | |
3639 | ||
7a292a7a | 3640 | void |
96baa820 JM |
3641 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3642 | LONGEST val) | |
7a292a7a | 3643 | { |
c5aa993b | 3644 | int size = REGISTER_RAW_SIZE (regno); |
7a292a7a SS |
3645 | void *buf = alloca (size); |
3646 | store_signed_integer (buf, size, val); | |
0818c12a | 3647 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
3648 | } |
3649 | ||
c906108c SS |
3650 | /* Save all of the information associated with the inferior<==>gdb |
3651 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3652 | (defined in inferior.h). */ | |
3653 | ||
7a292a7a | 3654 | struct inferior_status * |
96baa820 | 3655 | save_inferior_status (int restore_stack_info) |
c906108c | 3656 | { |
72cec141 | 3657 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 3658 | |
c906108c SS |
3659 | inf_status->stop_signal = stop_signal; |
3660 | inf_status->stop_pc = stop_pc; | |
3661 | inf_status->stop_step = stop_step; | |
3662 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3663 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3664 | inf_status->trap_expected = trap_expected; | |
3665 | inf_status->step_range_start = step_range_start; | |
3666 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 3667 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
3668 | inf_status->step_over_calls = step_over_calls; |
3669 | inf_status->stop_after_trap = stop_after_trap; | |
3670 | inf_status->stop_soon_quietly = stop_soon_quietly; | |
3671 | /* Save original bpstat chain here; replace it with copy of chain. | |
3672 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3673 | hand them back the original chain when restore_inferior_status is |
3674 | called. */ | |
c906108c SS |
3675 | inf_status->stop_bpstat = stop_bpstat; |
3676 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3677 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3678 | inf_status->restore_stack_info = restore_stack_info; | |
3679 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3680 | |
72cec141 | 3681 | inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers); |
c906108c | 3682 | |
72cec141 | 3683 | inf_status->registers = regcache_dup (current_regcache); |
c906108c | 3684 | |
7a424e99 | 3685 | inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame); |
7a292a7a | 3686 | return inf_status; |
c906108c SS |
3687 | } |
3688 | ||
c906108c | 3689 | static int |
96baa820 | 3690 | restore_selected_frame (void *args) |
c906108c | 3691 | { |
488f131b | 3692 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 3693 | struct frame_info *frame; |
c906108c | 3694 | |
101dcfbe | 3695 | frame = frame_find_by_id (*fid); |
c906108c | 3696 | |
aa0cd9c1 AC |
3697 | /* If inf_status->selected_frame_id is NULL, there was no previously |
3698 | selected frame. */ | |
101dcfbe | 3699 | if (frame == NULL) |
c906108c SS |
3700 | { |
3701 | warning ("Unable to restore previously selected frame.\n"); | |
3702 | return 0; | |
3703 | } | |
3704 | ||
0f7d239c | 3705 | select_frame (frame); |
c906108c SS |
3706 | |
3707 | return (1); | |
3708 | } | |
3709 | ||
3710 | void | |
96baa820 | 3711 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3712 | { |
3713 | stop_signal = inf_status->stop_signal; | |
3714 | stop_pc = inf_status->stop_pc; | |
3715 | stop_step = inf_status->stop_step; | |
3716 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3717 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3718 | trap_expected = inf_status->trap_expected; | |
3719 | step_range_start = inf_status->step_range_start; | |
3720 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 3721 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
3722 | step_over_calls = inf_status->step_over_calls; |
3723 | stop_after_trap = inf_status->stop_after_trap; | |
3724 | stop_soon_quietly = inf_status->stop_soon_quietly; | |
3725 | bpstat_clear (&stop_bpstat); | |
3726 | stop_bpstat = inf_status->stop_bpstat; | |
3727 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3728 | proceed_to_finish = inf_status->proceed_to_finish; | |
3729 | ||
72cec141 AC |
3730 | /* FIXME: Is the restore of stop_registers always needed. */ |
3731 | regcache_xfree (stop_registers); | |
3732 | stop_registers = inf_status->stop_registers; | |
c906108c SS |
3733 | |
3734 | /* The inferior can be gone if the user types "print exit(0)" | |
3735 | (and perhaps other times). */ | |
3736 | if (target_has_execution) | |
72cec141 AC |
3737 | /* NB: The register write goes through to the target. */ |
3738 | regcache_cpy (current_regcache, inf_status->registers); | |
3739 | regcache_xfree (inf_status->registers); | |
c906108c | 3740 | |
c906108c SS |
3741 | /* FIXME: If we are being called after stopping in a function which |
3742 | is called from gdb, we should not be trying to restore the | |
3743 | selected frame; it just prints a spurious error message (The | |
3744 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3745 | clobbers the stack)). In fact, should we be restoring the | |
3746 | inferior status at all in that case? . */ | |
3747 | ||
3748 | if (target_has_stack && inf_status->restore_stack_info) | |
3749 | { | |
c906108c | 3750 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
3751 | walking the stack might encounter a garbage pointer and |
3752 | error() trying to dereference it. */ | |
488f131b JB |
3753 | if (catch_errors |
3754 | (restore_selected_frame, &inf_status->selected_frame_id, | |
3755 | "Unable to restore previously selected frame:\n", | |
3756 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
3757 | /* Error in restoring the selected frame. Select the innermost |
3758 | frame. */ | |
0f7d239c | 3759 | select_frame (get_current_frame ()); |
c906108c SS |
3760 | |
3761 | } | |
c906108c | 3762 | |
72cec141 | 3763 | xfree (inf_status); |
7a292a7a | 3764 | } |
c906108c | 3765 | |
74b7792f AC |
3766 | static void |
3767 | do_restore_inferior_status_cleanup (void *sts) | |
3768 | { | |
3769 | restore_inferior_status (sts); | |
3770 | } | |
3771 | ||
3772 | struct cleanup * | |
3773 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
3774 | { | |
3775 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
3776 | } | |
3777 | ||
c906108c | 3778 | void |
96baa820 | 3779 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3780 | { |
3781 | /* See save_inferior_status for info on stop_bpstat. */ | |
3782 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 AC |
3783 | regcache_xfree (inf_status->registers); |
3784 | regcache_xfree (inf_status->stop_registers); | |
3785 | xfree (inf_status); | |
7a292a7a SS |
3786 | } |
3787 | ||
47932f85 DJ |
3788 | int |
3789 | inferior_has_forked (int pid, int *child_pid) | |
3790 | { | |
3791 | struct target_waitstatus last; | |
3792 | ptid_t last_ptid; | |
3793 | ||
3794 | get_last_target_status (&last_ptid, &last); | |
3795 | ||
3796 | if (last.kind != TARGET_WAITKIND_FORKED) | |
3797 | return 0; | |
3798 | ||
3799 | if (ptid_get_pid (last_ptid) != pid) | |
3800 | return 0; | |
3801 | ||
3802 | *child_pid = last.value.related_pid; | |
3803 | return 1; | |
3804 | } | |
3805 | ||
3806 | int | |
3807 | inferior_has_vforked (int pid, int *child_pid) | |
3808 | { | |
3809 | struct target_waitstatus last; | |
3810 | ptid_t last_ptid; | |
3811 | ||
3812 | get_last_target_status (&last_ptid, &last); | |
3813 | ||
3814 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
3815 | return 0; | |
3816 | ||
3817 | if (ptid_get_pid (last_ptid) != pid) | |
3818 | return 0; | |
3819 | ||
3820 | *child_pid = last.value.related_pid; | |
3821 | return 1; | |
3822 | } | |
3823 | ||
3824 | int | |
3825 | inferior_has_execd (int pid, char **execd_pathname) | |
3826 | { | |
3827 | struct target_waitstatus last; | |
3828 | ptid_t last_ptid; | |
3829 | ||
3830 | get_last_target_status (&last_ptid, &last); | |
3831 | ||
3832 | if (last.kind != TARGET_WAITKIND_EXECD) | |
3833 | return 0; | |
3834 | ||
3835 | if (ptid_get_pid (last_ptid) != pid) | |
3836 | return 0; | |
3837 | ||
3838 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
3839 | return 1; | |
3840 | } | |
3841 | ||
ca6724c1 KB |
3842 | /* Oft used ptids */ |
3843 | ptid_t null_ptid; | |
3844 | ptid_t minus_one_ptid; | |
3845 | ||
3846 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 3847 | |
ca6724c1 KB |
3848 | ptid_t |
3849 | ptid_build (int pid, long lwp, long tid) | |
3850 | { | |
3851 | ptid_t ptid; | |
3852 | ||
3853 | ptid.pid = pid; | |
3854 | ptid.lwp = lwp; | |
3855 | ptid.tid = tid; | |
3856 | return ptid; | |
3857 | } | |
3858 | ||
3859 | /* Create a ptid from just a pid. */ | |
3860 | ||
3861 | ptid_t | |
3862 | pid_to_ptid (int pid) | |
3863 | { | |
3864 | return ptid_build (pid, 0, 0); | |
3865 | } | |
3866 | ||
3867 | /* Fetch the pid (process id) component from a ptid. */ | |
3868 | ||
3869 | int | |
3870 | ptid_get_pid (ptid_t ptid) | |
3871 | { | |
3872 | return ptid.pid; | |
3873 | } | |
3874 | ||
3875 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
3876 | ||
3877 | long | |
3878 | ptid_get_lwp (ptid_t ptid) | |
3879 | { | |
3880 | return ptid.lwp; | |
3881 | } | |
3882 | ||
3883 | /* Fetch the tid (thread id) component from a ptid. */ | |
3884 | ||
3885 | long | |
3886 | ptid_get_tid (ptid_t ptid) | |
3887 | { | |
3888 | return ptid.tid; | |
3889 | } | |
3890 | ||
3891 | /* ptid_equal() is used to test equality of two ptids. */ | |
3892 | ||
3893 | int | |
3894 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
3895 | { | |
3896 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 3897 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
3898 | } |
3899 | ||
3900 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
3901 | to restore the inferior_ptid value saved in a call to | |
3902 | save_inferior_ptid(). */ | |
ce696e05 KB |
3903 | |
3904 | static void | |
3905 | restore_inferior_ptid (void *arg) | |
3906 | { | |
3907 | ptid_t *saved_ptid_ptr = arg; | |
3908 | inferior_ptid = *saved_ptid_ptr; | |
3909 | xfree (arg); | |
3910 | } | |
3911 | ||
3912 | /* Save the value of inferior_ptid so that it may be restored by a | |
3913 | later call to do_cleanups(). Returns the struct cleanup pointer | |
3914 | needed for later doing the cleanup. */ | |
3915 | ||
3916 | struct cleanup * | |
3917 | save_inferior_ptid (void) | |
3918 | { | |
3919 | ptid_t *saved_ptid_ptr; | |
3920 | ||
3921 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
3922 | *saved_ptid_ptr = inferior_ptid; | |
3923 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
3924 | } | |
c5aa993b | 3925 | \f |
488f131b | 3926 | |
7a292a7a | 3927 | static void |
96baa820 | 3928 | build_infrun (void) |
7a292a7a | 3929 | { |
72cec141 | 3930 | stop_registers = regcache_xmalloc (current_gdbarch); |
7a292a7a | 3931 | } |
c906108c | 3932 | |
c906108c | 3933 | void |
96baa820 | 3934 | _initialize_infrun (void) |
c906108c SS |
3935 | { |
3936 | register int i; | |
3937 | register int numsigs; | |
3938 | struct cmd_list_element *c; | |
3939 | ||
0f71a2f6 JM |
3940 | register_gdbarch_swap (&stop_registers, sizeof (stop_registers), NULL); |
3941 | register_gdbarch_swap (NULL, 0, build_infrun); | |
3942 | ||
c906108c SS |
3943 | add_info ("signals", signals_info, |
3944 | "What debugger does when program gets various signals.\n\ | |
3945 | Specify a signal as argument to print info on that signal only."); | |
3946 | add_info_alias ("handle", "signals", 0); | |
3947 | ||
3948 | add_com ("handle", class_run, handle_command, | |
3949 | concat ("Specify how to handle a signal.\n\ | |
3950 | Args are signals and actions to apply to those signals.\n\ | |
3951 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3952 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3953 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3954 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3955 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
3956 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
3957 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3958 | Print means print a message if this signal happens.\n\ | |
3959 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3960 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3961 | Pass and Stop may be combined.", NULL)); | |
3962 | if (xdb_commands) | |
3963 | { | |
3964 | add_com ("lz", class_info, signals_info, | |
3965 | "What debugger does when program gets various signals.\n\ | |
3966 | Specify a signal as argument to print info on that signal only."); | |
3967 | add_com ("z", class_run, xdb_handle_command, | |
3968 | concat ("Specify how to handle a signal.\n\ | |
3969 | Args are signals and actions to apply to those signals.\n\ | |
3970 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3971 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3972 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3973 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3974 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\ |
c906108c SS |
3975 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
3976 | nopass), \"Q\" (noprint)\n\ | |
3977 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3978 | Print means print a message if this signal happens.\n\ | |
3979 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3980 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3981 | Pass and Stop may be combined.", NULL)); | |
3982 | } | |
3983 | ||
3984 | if (!dbx_commands) | |
488f131b JB |
3985 | stop_command = |
3986 | 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 |
3987 | This allows you to set a list of commands to be run each time execution\n\ |
3988 | of the program stops.", &cmdlist); | |
3989 | ||
3990 | numsigs = (int) TARGET_SIGNAL_LAST; | |
488f131b | 3991 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
3992 | signal_print = (unsigned char *) |
3993 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
3994 | signal_program = (unsigned char *) | |
3995 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
3996 | for (i = 0; i < numsigs; i++) | |
3997 | { | |
3998 | signal_stop[i] = 1; | |
3999 | signal_print[i] = 1; | |
4000 | signal_program[i] = 1; | |
4001 | } | |
4002 | ||
4003 | /* Signals caused by debugger's own actions | |
4004 | should not be given to the program afterwards. */ | |
4005 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
4006 | signal_program[TARGET_SIGNAL_INT] = 0; | |
4007 | ||
4008 | /* Signals that are not errors should not normally enter the debugger. */ | |
4009 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
4010 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
4011 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
4012 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
4013 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
4014 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
4015 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
4016 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
4017 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
4018 | signal_print[TARGET_SIGNAL_IO] = 0; | |
4019 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
4020 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
4021 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
4022 | signal_print[TARGET_SIGNAL_URG] = 0; | |
4023 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
4024 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
4025 | ||
cd0fc7c3 SS |
4026 | /* These signals are used internally by user-level thread |
4027 | implementations. (See signal(5) on Solaris.) Like the above | |
4028 | signals, a healthy program receives and handles them as part of | |
4029 | its normal operation. */ | |
4030 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
4031 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
4032 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
4033 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
4034 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
4035 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
4036 | ||
c906108c SS |
4037 | #ifdef SOLIB_ADD |
4038 | add_show_from_set | |
4039 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, | |
4040 | (char *) &stop_on_solib_events, | |
4041 | "Set stopping for shared library events.\n\ | |
4042 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
4043 | notifies gdb of shared library events. The most common event of interest\n\ | |
488f131b | 4044 | to the user would be loading/unloading of a new library.\n", &setlist), &showlist); |
c906108c SS |
4045 | #endif |
4046 | ||
4047 | c = add_set_enum_cmd ("follow-fork-mode", | |
4048 | class_run, | |
488f131b | 4049 | follow_fork_mode_kind_names, &follow_fork_mode_string, |
c906108c SS |
4050 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 |
4051 | kernel problem. It's also not terribly useful without a GUI to | |
4052 | help the user drive two debuggers. So for now, I'm disabling | |
4053 | the "both" option. */ | |
c5aa993b JM |
4054 | /* "Set debugger response to a program call of fork \ |
4055 | or vfork.\n\ | |
4056 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
4057 | parent - the original process is debugged after a fork\n\ | |
4058 | child - the new process is debugged after a fork\n\ | |
4059 | both - both the parent and child are debugged after a fork\n\ | |
4060 | ask - the debugger will ask for one of the above choices\n\ | |
4061 | For \"both\", another copy of the debugger will be started to follow\n\ | |
4062 | the new child process. The original debugger will continue to follow\n\ | |
4063 | the original parent process. To distinguish their prompts, the\n\ | |
4064 | debugger copy's prompt will be changed.\n\ | |
4065 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
4066 | By default, the debugger will follow the parent process.", | |
4067 | */ | |
c906108c SS |
4068 | "Set debugger response to a program call of fork \ |
4069 | or vfork.\n\ | |
4070 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
4071 | parent - the original process is debugged after a fork\n\ | |
4072 | child - the new process is debugged after a fork\n\ | |
4073 | ask - the debugger will ask for one of the above choices\n\ | |
4074 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
488f131b | 4075 | By default, the debugger will follow the parent process.", &setlist); |
c906108c SS |
4076 | add_show_from_set (c, &showlist); |
4077 | ||
488f131b | 4078 | c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */ |
1ed2a135 | 4079 | &scheduler_mode, /* current mode */ |
c906108c SS |
4080 | "Set mode for locking scheduler during execution.\n\ |
4081 | off == no locking (threads may preempt at any time)\n\ | |
4082 | on == full locking (no thread except the current thread may run)\n\ | |
4083 | step == scheduler locked during every single-step operation.\n\ | |
4084 | In this mode, no other thread may run during a step command.\n\ | |
488f131b | 4085 | Other threads may run while stepping over a function call ('next').", &setlist); |
c906108c | 4086 | |
9f60d481 | 4087 | set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */ |
c906108c | 4088 | add_show_from_set (c, &showlist); |
5fbbeb29 CF |
4089 | |
4090 | c = add_set_cmd ("step-mode", class_run, | |
488f131b JB |
4091 | var_boolean, (char *) &step_stop_if_no_debug, |
4092 | "Set mode of the step operation. When set, doing a step over a\n\ | |
5fbbeb29 CF |
4093 | function without debug line information will stop at the first\n\ |
4094 | instruction of that function. Otherwise, the function is skipped and\n\ | |
488f131b | 4095 | the step command stops at a different source line.", &setlist); |
5fbbeb29 | 4096 | add_show_from_set (c, &showlist); |
ca6724c1 KB |
4097 | |
4098 | /* ptid initializations */ | |
4099 | null_ptid = ptid_build (0, 0, 0); | |
4100 | minus_one_ptid = ptid_build (-1, 0, 0); | |
4101 | inferior_ptid = null_ptid; | |
4102 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 4103 | } |