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Commit | Line | Data |
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ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c AC |
3 | |
4 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, | |
7789c6f5 | 5 | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software |
8926118c | 6 | Foundation, Inc. |
c906108c | 7 | |
c5aa993b | 8 | This file is part of GDB. |
c906108c | 9 | |
c5aa993b JM |
10 | This program is free software; you can redistribute it and/or modify |
11 | it under the terms of the GNU General Public License as published by | |
12 | the Free Software Foundation; either version 2 of the License, or | |
13 | (at your option) any later version. | |
c906108c | 14 | |
c5aa993b JM |
15 | This program is distributed in the hope that it will be useful, |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
c906108c | 19 | |
c5aa993b JM |
20 | You should have received a copy of the GNU General Public License |
21 | along with this program; if not, write to the Free Software | |
22 | Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
24 | |
25 | #include "defs.h" | |
26 | #include "gdb_string.h" | |
27 | #include <ctype.h> | |
28 | #include "symtab.h" | |
29 | #include "frame.h" | |
30 | #include "inferior.h" | |
31 | #include "breakpoint.h" | |
03f2053f | 32 | #include "gdb_wait.h" |
c906108c SS |
33 | #include "gdbcore.h" |
34 | #include "gdbcmd.h" | |
210661e7 | 35 | #include "cli/cli-script.h" |
c906108c SS |
36 | #include "target.h" |
37 | #include "gdbthread.h" | |
38 | #include "annotate.h" | |
1adeb98a | 39 | #include "symfile.h" |
7a292a7a | 40 | #include "top.h" |
c906108c | 41 | #include <signal.h> |
2acceee2 | 42 | #include "inf-loop.h" |
4e052eda | 43 | #include "regcache.h" |
fd0407d6 | 44 | #include "value.h" |
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 | ||
4ef3f3be | 69 | static int follow_fork (void); |
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 | 357 | int parent_pid; |
488f131b | 358 | int child_pid; |
c906108c | 359 | } |
488f131b JB |
360 | fork_event; |
361 | char *execd_pathname; | |
362 | } | |
c906108c SS |
363 | pending_follow; |
364 | ||
53904c9e | 365 | static const char follow_fork_mode_ask[] = "ask"; |
53904c9e AC |
366 | static const char follow_fork_mode_child[] = "child"; |
367 | static const char follow_fork_mode_parent[] = "parent"; | |
368 | ||
488f131b | 369 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e | 370 | follow_fork_mode_ask, |
53904c9e AC |
371 | follow_fork_mode_child, |
372 | follow_fork_mode_parent, | |
373 | NULL | |
ef346e04 | 374 | }; |
c906108c | 375 | |
53904c9e | 376 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
c906108c SS |
377 | \f |
378 | ||
6604731b | 379 | static int |
4ef3f3be | 380 | follow_fork (void) |
c906108c | 381 | { |
53904c9e | 382 | const char *follow_mode = follow_fork_mode_string; |
6604731b | 383 | int follow_child = (follow_mode == follow_fork_mode_child); |
c906108c SS |
384 | |
385 | /* Or, did the user not know, and want us to ask? */ | |
e28d556f | 386 | if (follow_fork_mode_string == follow_fork_mode_ask) |
c906108c | 387 | { |
8e65ff28 AC |
388 | internal_error (__FILE__, __LINE__, |
389 | "follow_inferior_fork: \"ask\" mode not implemented"); | |
53904c9e | 390 | /* follow_mode = follow_fork_mode_...; */ |
c906108c SS |
391 | } |
392 | ||
6604731b | 393 | return target_follow_fork (follow_child); |
c906108c SS |
394 | } |
395 | ||
6604731b DJ |
396 | void |
397 | follow_inferior_reset_breakpoints (void) | |
c906108c | 398 | { |
6604731b DJ |
399 | /* Was there a step_resume breakpoint? (There was if the user |
400 | did a "next" at the fork() call.) If so, explicitly reset its | |
401 | thread number. | |
402 | ||
403 | step_resumes are a form of bp that are made to be per-thread. | |
404 | Since we created the step_resume bp when the parent process | |
405 | was being debugged, and now are switching to the child process, | |
406 | from the breakpoint package's viewpoint, that's a switch of | |
407 | "threads". We must update the bp's notion of which thread | |
408 | it is for, or it'll be ignored when it triggers. */ | |
409 | ||
410 | if (step_resume_breakpoint) | |
411 | breakpoint_re_set_thread (step_resume_breakpoint); | |
412 | ||
413 | /* Reinsert all breakpoints in the child. The user may have set | |
414 | breakpoints after catching the fork, in which case those | |
415 | were never set in the child, but only in the parent. This makes | |
416 | sure the inserted breakpoints match the breakpoint list. */ | |
417 | ||
418 | breakpoint_re_set (); | |
419 | insert_breakpoints (); | |
c906108c | 420 | } |
c906108c | 421 | |
1adeb98a FN |
422 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
423 | ||
c906108c | 424 | static void |
96baa820 | 425 | follow_exec (int pid, char *execd_pathname) |
c906108c | 426 | { |
c906108c | 427 | int saved_pid = pid; |
7a292a7a SS |
428 | struct target_ops *tgt; |
429 | ||
430 | if (!may_follow_exec) | |
431 | return; | |
c906108c | 432 | |
c906108c SS |
433 | /* This is an exec event that we actually wish to pay attention to. |
434 | Refresh our symbol table to the newly exec'd program, remove any | |
435 | momentary bp's, etc. | |
436 | ||
437 | If there are breakpoints, they aren't really inserted now, | |
438 | since the exec() transformed our inferior into a fresh set | |
439 | of instructions. | |
440 | ||
441 | We want to preserve symbolic breakpoints on the list, since | |
442 | we have hopes that they can be reset after the new a.out's | |
443 | symbol table is read. | |
444 | ||
445 | However, any "raw" breakpoints must be removed from the list | |
446 | (e.g., the solib bp's), since their address is probably invalid | |
447 | now. | |
448 | ||
449 | And, we DON'T want to call delete_breakpoints() here, since | |
450 | that may write the bp's "shadow contents" (the instruction | |
451 | value that was overwritten witha TRAP instruction). Since | |
452 | we now have a new a.out, those shadow contents aren't valid. */ | |
453 | update_breakpoints_after_exec (); | |
454 | ||
455 | /* If there was one, it's gone now. We cannot truly step-to-next | |
456 | statement through an exec(). */ | |
457 | step_resume_breakpoint = NULL; | |
458 | step_range_start = 0; | |
459 | step_range_end = 0; | |
460 | ||
461 | /* If there was one, it's gone now. */ | |
462 | through_sigtramp_breakpoint = NULL; | |
463 | ||
464 | /* What is this a.out's name? */ | |
465 | printf_unfiltered ("Executing new program: %s\n", execd_pathname); | |
466 | ||
467 | /* We've followed the inferior through an exec. Therefore, the | |
468 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
469 | |
470 | /* First collect the run target in effect. */ | |
471 | tgt = find_run_target (); | |
472 | /* If we can't find one, things are in a very strange state... */ | |
473 | if (tgt == NULL) | |
474 | error ("Could find run target to save before following exec"); | |
475 | ||
c906108c SS |
476 | gdb_flush (gdb_stdout); |
477 | target_mourn_inferior (); | |
39f77062 | 478 | inferior_ptid = pid_to_ptid (saved_pid); |
488f131b | 479 | /* Because mourn_inferior resets inferior_ptid. */ |
7a292a7a | 480 | push_target (tgt); |
c906108c SS |
481 | |
482 | /* That a.out is now the one to use. */ | |
483 | exec_file_attach (execd_pathname, 0); | |
484 | ||
485 | /* And also is where symbols can be found. */ | |
1adeb98a | 486 | symbol_file_add_main (execd_pathname, 0); |
c906108c SS |
487 | |
488 | /* Reset the shared library package. This ensures that we get | |
489 | a shlib event when the child reaches "_start", at which point | |
490 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 491 | #if defined(SOLIB_RESTART) |
c906108c | 492 | SOLIB_RESTART (); |
7a292a7a SS |
493 | #endif |
494 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
39f77062 | 495 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
7a292a7a | 496 | #endif |
c906108c SS |
497 | |
498 | /* Reinsert all breakpoints. (Those which were symbolic have | |
499 | been reset to the proper address in the new a.out, thanks | |
500 | to symbol_file_command...) */ | |
501 | insert_breakpoints (); | |
502 | ||
503 | /* The next resume of this inferior should bring it to the shlib | |
504 | startup breakpoints. (If the user had also set bp's on | |
505 | "main" from the old (parent) process, then they'll auto- | |
506 | matically get reset there in the new process.) */ | |
c906108c SS |
507 | } |
508 | ||
509 | /* Non-zero if we just simulating a single-step. This is needed | |
510 | because we cannot remove the breakpoints in the inferior process | |
511 | until after the `wait' in `wait_for_inferior'. */ | |
512 | static int singlestep_breakpoints_inserted_p = 0; | |
513 | \f | |
514 | ||
515 | /* Things to clean up if we QUIT out of resume (). */ | |
516 | /* ARGSUSED */ | |
517 | static void | |
74b7792f | 518 | resume_cleanups (void *ignore) |
c906108c SS |
519 | { |
520 | normal_stop (); | |
521 | } | |
522 | ||
53904c9e AC |
523 | static const char schedlock_off[] = "off"; |
524 | static const char schedlock_on[] = "on"; | |
525 | static const char schedlock_step[] = "step"; | |
526 | static const char *scheduler_mode = schedlock_off; | |
488f131b | 527 | static const char *scheduler_enums[] = { |
ef346e04 AC |
528 | schedlock_off, |
529 | schedlock_on, | |
530 | schedlock_step, | |
531 | NULL | |
532 | }; | |
c906108c SS |
533 | |
534 | static void | |
96baa820 | 535 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 536 | { |
1868c04e AC |
537 | /* NOTE: cagney/2002-03-17: The add_show_from_set() function clones |
538 | the set command passed as a parameter. The clone operation will | |
539 | include (BUG?) any ``set'' command callback, if present. | |
540 | Commands like ``info set'' call all the ``show'' command | |
541 | callbacks. Unfortunatly, for ``show'' commands cloned from | |
542 | ``set'', this includes callbacks belonging to ``set'' commands. | |
543 | Making this worse, this only occures if add_show_from_set() is | |
544 | called after add_cmd_sfunc() (BUG?). */ | |
545 | if (cmd_type (c) == set_cmd) | |
c906108c SS |
546 | if (!target_can_lock_scheduler) |
547 | { | |
548 | scheduler_mode = schedlock_off; | |
488f131b | 549 | error ("Target '%s' cannot support this command.", target_shortname); |
c906108c SS |
550 | } |
551 | } | |
552 | ||
553 | ||
554 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
555 | wants to interrupt some lengthy single-stepping operation | |
556 | (for child processes, the SIGINT goes to the inferior, and so | |
557 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
558 | other targets, that's not true). | |
559 | ||
560 | STEP nonzero if we should step (zero to continue instead). | |
561 | SIG is the signal to give the inferior (zero for none). */ | |
562 | void | |
96baa820 | 563 | resume (int step, enum target_signal sig) |
c906108c SS |
564 | { |
565 | int should_resume = 1; | |
74b7792f | 566 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
c906108c SS |
567 | QUIT; |
568 | ||
ef5cf84e MS |
569 | /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */ |
570 | ||
c906108c | 571 | |
692590c1 MS |
572 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
573 | over an instruction that causes a page fault without triggering | |
574 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
575 | stop, because the hardware watchpoint is not triggered, but it forgets | |
576 | the step request and continues the program normally. | |
577 | Work around the problem by removing hardware watchpoints if a step is | |
578 | requested, GDB will check for a hardware watchpoint trigger after the | |
579 | step anyway. */ | |
580 | if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) | |
581 | remove_hw_watchpoints (); | |
488f131b | 582 | |
692590c1 | 583 | |
c2c6d25f JM |
584 | /* Normally, by the time we reach `resume', the breakpoints are either |
585 | removed or inserted, as appropriate. The exception is if we're sitting | |
586 | at a permanent breakpoint; we need to step over it, but permanent | |
587 | breakpoints can't be removed. So we have to test for it here. */ | |
588 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
589 | SKIP_PERMANENT_BREAKPOINT (); | |
590 | ||
b0ed3589 | 591 | if (SOFTWARE_SINGLE_STEP_P () && step) |
c906108c SS |
592 | { |
593 | /* Do it the hard way, w/temp breakpoints */ | |
c5aa993b | 594 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
c906108c SS |
595 | /* ...and don't ask hardware to do it. */ |
596 | step = 0; | |
597 | /* and do not pull these breakpoints until after a `wait' in | |
598 | `wait_for_inferior' */ | |
599 | singlestep_breakpoints_inserted_p = 1; | |
600 | } | |
601 | ||
602 | /* Handle any optimized stores to the inferior NOW... */ | |
603 | #ifdef DO_DEFERRED_STORES | |
604 | DO_DEFERRED_STORES; | |
605 | #endif | |
606 | ||
c906108c | 607 | /* If there were any forks/vforks/execs that were caught and are |
6604731b | 608 | now to be followed, then do so. */ |
c906108c SS |
609 | switch (pending_follow.kind) |
610 | { | |
6604731b DJ |
611 | case TARGET_WAITKIND_FORKED: |
612 | case TARGET_WAITKIND_VFORKED: | |
c906108c | 613 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
6604731b DJ |
614 | if (follow_fork ()) |
615 | should_resume = 0; | |
c906108c SS |
616 | break; |
617 | ||
6604731b | 618 | case TARGET_WAITKIND_EXECD: |
c906108c | 619 | /* follow_exec is called as soon as the exec event is seen. */ |
6604731b | 620 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
c906108c SS |
621 | break; |
622 | ||
623 | default: | |
624 | break; | |
625 | } | |
c906108c SS |
626 | |
627 | /* Install inferior's terminal modes. */ | |
628 | target_terminal_inferior (); | |
629 | ||
630 | if (should_resume) | |
631 | { | |
39f77062 | 632 | ptid_t resume_ptid; |
dfcd3bfb | 633 | |
488f131b | 634 | resume_ptid = RESUME_ALL; /* Default */ |
ef5cf84e MS |
635 | |
636 | if ((step || singlestep_breakpoints_inserted_p) && | |
637 | !breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
c906108c | 638 | { |
ef5cf84e MS |
639 | /* Stepping past a breakpoint without inserting breakpoints. |
640 | Make sure only the current thread gets to step, so that | |
641 | other threads don't sneak past breakpoints while they are | |
642 | not inserted. */ | |
c906108c | 643 | |
ef5cf84e | 644 | resume_ptid = inferior_ptid; |
c906108c | 645 | } |
ef5cf84e MS |
646 | |
647 | if ((scheduler_mode == schedlock_on) || | |
488f131b | 648 | (scheduler_mode == schedlock_step && |
ef5cf84e | 649 | (step || singlestep_breakpoints_inserted_p))) |
c906108c | 650 | { |
ef5cf84e | 651 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 652 | resume_ptid = inferior_ptid; |
c906108c | 653 | } |
ef5cf84e | 654 | |
c4ed33b9 AC |
655 | if (CANNOT_STEP_BREAKPOINT) |
656 | { | |
657 | /* Most targets can step a breakpoint instruction, thus | |
658 | executing it normally. But if this one cannot, just | |
659 | continue and we will hit it anyway. */ | |
660 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
661 | step = 0; | |
662 | } | |
39f77062 | 663 | target_resume (resume_ptid, step, sig); |
c906108c SS |
664 | } |
665 | ||
666 | discard_cleanups (old_cleanups); | |
667 | } | |
668 | \f | |
669 | ||
670 | /* Clear out all variables saying what to do when inferior is continued. | |
671 | First do this, then set the ones you want, then call `proceed'. */ | |
672 | ||
673 | void | |
96baa820 | 674 | clear_proceed_status (void) |
c906108c SS |
675 | { |
676 | trap_expected = 0; | |
677 | step_range_start = 0; | |
678 | step_range_end = 0; | |
aa0cd9c1 | 679 | step_frame_id = null_frame_id; |
5fbbeb29 | 680 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c SS |
681 | stop_after_trap = 0; |
682 | stop_soon_quietly = 0; | |
683 | proceed_to_finish = 0; | |
684 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
685 | ||
686 | /* Discard any remaining commands or status from previous stop. */ | |
687 | bpstat_clear (&stop_bpstat); | |
688 | } | |
689 | ||
690 | /* Basic routine for continuing the program in various fashions. | |
691 | ||
692 | ADDR is the address to resume at, or -1 for resume where stopped. | |
693 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 694 | or -1 for act according to how it stopped. |
c906108c | 695 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
696 | -1 means return after that and print nothing. |
697 | You should probably set various step_... variables | |
698 | before calling here, if you are stepping. | |
c906108c SS |
699 | |
700 | You should call clear_proceed_status before calling proceed. */ | |
701 | ||
702 | void | |
96baa820 | 703 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
704 | { |
705 | int oneproc = 0; | |
706 | ||
707 | if (step > 0) | |
708 | step_start_function = find_pc_function (read_pc ()); | |
709 | if (step < 0) | |
710 | stop_after_trap = 1; | |
711 | ||
2acceee2 | 712 | if (addr == (CORE_ADDR) -1) |
c906108c SS |
713 | { |
714 | /* If there is a breakpoint at the address we will resume at, | |
c5aa993b JM |
715 | step one instruction before inserting breakpoints |
716 | so that we do not stop right away (and report a second | |
c906108c SS |
717 | hit at this breakpoint). */ |
718 | ||
719 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) | |
720 | oneproc = 1; | |
721 | ||
722 | #ifndef STEP_SKIPS_DELAY | |
723 | #define STEP_SKIPS_DELAY(pc) (0) | |
724 | #define STEP_SKIPS_DELAY_P (0) | |
725 | #endif | |
726 | /* Check breakpoint_here_p first, because breakpoint_here_p is fast | |
c5aa993b JM |
727 | (it just checks internal GDB data structures) and STEP_SKIPS_DELAY |
728 | is slow (it needs to read memory from the target). */ | |
c906108c SS |
729 | if (STEP_SKIPS_DELAY_P |
730 | && breakpoint_here_p (read_pc () + 4) | |
731 | && STEP_SKIPS_DELAY (read_pc ())) | |
732 | oneproc = 1; | |
733 | } | |
734 | else | |
735 | { | |
736 | write_pc (addr); | |
c906108c SS |
737 | } |
738 | ||
739 | #ifdef PREPARE_TO_PROCEED | |
740 | /* In a multi-threaded task we may select another thread | |
741 | and then continue or step. | |
742 | ||
743 | But if the old thread was stopped at a breakpoint, it | |
744 | will immediately cause another breakpoint stop without | |
745 | any execution (i.e. it will report a breakpoint hit | |
746 | incorrectly). So we must step over it first. | |
747 | ||
748 | PREPARE_TO_PROCEED checks the current thread against the thread | |
749 | that reported the most recent event. If a step-over is required | |
750 | it returns TRUE and sets the current thread to the old thread. */ | |
9e086581 | 751 | if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ())) |
c906108c SS |
752 | { |
753 | oneproc = 1; | |
c906108c SS |
754 | } |
755 | ||
756 | #endif /* PREPARE_TO_PROCEED */ | |
757 | ||
758 | #ifdef HP_OS_BUG | |
759 | if (trap_expected_after_continue) | |
760 | { | |
761 | /* If (step == 0), a trap will be automatically generated after | |
c5aa993b JM |
762 | the first instruction is executed. Force step one |
763 | instruction to clear this condition. This should not occur | |
764 | if step is nonzero, but it is harmless in that case. */ | |
c906108c SS |
765 | oneproc = 1; |
766 | trap_expected_after_continue = 0; | |
767 | } | |
768 | #endif /* HP_OS_BUG */ | |
769 | ||
770 | if (oneproc) | |
771 | /* We will get a trace trap after one instruction. | |
772 | Continue it automatically and insert breakpoints then. */ | |
773 | trap_expected = 1; | |
774 | else | |
775 | { | |
81d0cc19 GS |
776 | insert_breakpoints (); |
777 | /* If we get here there was no call to error() in | |
778 | insert breakpoints -- so they were inserted. */ | |
c906108c SS |
779 | breakpoints_inserted = 1; |
780 | } | |
781 | ||
782 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
783 | stop_signal = siggnal; | |
784 | /* If this signal should not be seen by program, | |
785 | give it zero. Used for debugging signals. */ | |
786 | else if (!signal_program[stop_signal]) | |
787 | stop_signal = TARGET_SIGNAL_0; | |
788 | ||
789 | annotate_starting (); | |
790 | ||
791 | /* Make sure that output from GDB appears before output from the | |
792 | inferior. */ | |
793 | gdb_flush (gdb_stdout); | |
794 | ||
795 | /* Resume inferior. */ | |
796 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
797 | ||
798 | /* Wait for it to stop (if not standalone) | |
799 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
800 | /* Do this only if we are not using the event loop, or if the target |
801 | does not support asynchronous execution. */ | |
6426a772 | 802 | if (!event_loop_p || !target_can_async_p ()) |
43ff13b4 JM |
803 | { |
804 | wait_for_inferior (); | |
805 | normal_stop (); | |
806 | } | |
c906108c SS |
807 | } |
808 | ||
809 | /* Record the pc and sp of the program the last time it stopped. | |
810 | These are just used internally by wait_for_inferior, but need | |
811 | to be preserved over calls to it and cleared when the inferior | |
812 | is started. */ | |
813 | static CORE_ADDR prev_pc; | |
814 | static CORE_ADDR prev_func_start; | |
815 | static char *prev_func_name; | |
816 | \f | |
817 | ||
818 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 819 | |
c906108c | 820 | void |
96baa820 | 821 | start_remote (void) |
c906108c SS |
822 | { |
823 | init_thread_list (); | |
824 | init_wait_for_inferior (); | |
825 | stop_soon_quietly = 1; | |
826 | trap_expected = 0; | |
43ff13b4 | 827 | |
6426a772 JM |
828 | /* Always go on waiting for the target, regardless of the mode. */ |
829 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 830 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
831 | nothing is returned (instead of just blocking). Because of this, |
832 | targets expecting an immediate response need to, internally, set | |
833 | things up so that the target_wait() is forced to eventually | |
834 | timeout. */ | |
835 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
836 | differentiate to its caller what the state of the target is after | |
837 | the initial open has been performed. Here we're assuming that | |
838 | the target has stopped. It should be possible to eventually have | |
839 | target_open() return to the caller an indication that the target | |
840 | is currently running and GDB state should be set to the same as | |
841 | for an async run. */ | |
842 | wait_for_inferior (); | |
843 | normal_stop (); | |
c906108c SS |
844 | } |
845 | ||
846 | /* Initialize static vars when a new inferior begins. */ | |
847 | ||
848 | void | |
96baa820 | 849 | init_wait_for_inferior (void) |
c906108c SS |
850 | { |
851 | /* These are meaningless until the first time through wait_for_inferior. */ | |
852 | prev_pc = 0; | |
853 | prev_func_start = 0; | |
854 | prev_func_name = NULL; | |
855 | ||
856 | #ifdef HP_OS_BUG | |
857 | trap_expected_after_continue = 0; | |
858 | #endif | |
859 | breakpoints_inserted = 0; | |
860 | breakpoint_init_inferior (inf_starting); | |
861 | ||
862 | /* Don't confuse first call to proceed(). */ | |
863 | stop_signal = TARGET_SIGNAL_0; | |
864 | ||
865 | /* The first resume is not following a fork/vfork/exec. */ | |
866 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
c906108c SS |
867 | |
868 | /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ | |
869 | number_of_threads_in_syscalls = 0; | |
870 | ||
871 | clear_proceed_status (); | |
872 | } | |
873 | ||
874 | static void | |
96baa820 | 875 | delete_breakpoint_current_contents (void *arg) |
c906108c SS |
876 | { |
877 | struct breakpoint **breakpointp = (struct breakpoint **) arg; | |
878 | if (*breakpointp != NULL) | |
879 | { | |
880 | delete_breakpoint (*breakpointp); | |
881 | *breakpointp = NULL; | |
882 | } | |
883 | } | |
884 | \f | |
b83266a0 SS |
885 | /* This enum encodes possible reasons for doing a target_wait, so that |
886 | wfi can call target_wait in one place. (Ultimately the call will be | |
887 | moved out of the infinite loop entirely.) */ | |
888 | ||
c5aa993b JM |
889 | enum infwait_states |
890 | { | |
cd0fc7c3 SS |
891 | infwait_normal_state, |
892 | infwait_thread_hop_state, | |
893 | infwait_nullified_state, | |
894 | infwait_nonstep_watch_state | |
b83266a0 SS |
895 | }; |
896 | ||
11cf8741 JM |
897 | /* Why did the inferior stop? Used to print the appropriate messages |
898 | to the interface from within handle_inferior_event(). */ | |
899 | enum inferior_stop_reason | |
900 | { | |
901 | /* We don't know why. */ | |
902 | STOP_UNKNOWN, | |
903 | /* Step, next, nexti, stepi finished. */ | |
904 | END_STEPPING_RANGE, | |
905 | /* Found breakpoint. */ | |
906 | BREAKPOINT_HIT, | |
907 | /* Inferior terminated by signal. */ | |
908 | SIGNAL_EXITED, | |
909 | /* Inferior exited. */ | |
910 | EXITED, | |
911 | /* Inferior received signal, and user asked to be notified. */ | |
912 | SIGNAL_RECEIVED | |
913 | }; | |
914 | ||
cd0fc7c3 SS |
915 | /* This structure contains what used to be local variables in |
916 | wait_for_inferior. Probably many of them can return to being | |
917 | locals in handle_inferior_event. */ | |
918 | ||
c5aa993b | 919 | struct execution_control_state |
488f131b JB |
920 | { |
921 | struct target_waitstatus ws; | |
922 | struct target_waitstatus *wp; | |
923 | int another_trap; | |
924 | int random_signal; | |
925 | CORE_ADDR stop_func_start; | |
926 | CORE_ADDR stop_func_end; | |
927 | char *stop_func_name; | |
928 | struct symtab_and_line sal; | |
929 | int remove_breakpoints_on_following_step; | |
930 | int current_line; | |
931 | struct symtab *current_symtab; | |
932 | int handling_longjmp; /* FIXME */ | |
933 | ptid_t ptid; | |
934 | ptid_t saved_inferior_ptid; | |
935 | int update_step_sp; | |
936 | int stepping_through_solib_after_catch; | |
937 | bpstat stepping_through_solib_catchpoints; | |
938 | int enable_hw_watchpoints_after_wait; | |
939 | int stepping_through_sigtramp; | |
940 | int new_thread_event; | |
941 | struct target_waitstatus tmpstatus; | |
942 | enum infwait_states infwait_state; | |
943 | ptid_t waiton_ptid; | |
944 | int wait_some_more; | |
945 | }; | |
946 | ||
947 | void init_execution_control_state (struct execution_control_state *ecs); | |
948 | ||
949 | void handle_inferior_event (struct execution_control_state *ecs); | |
cd0fc7c3 | 950 | |
104c1213 | 951 | static void check_sigtramp2 (struct execution_control_state *ecs); |
c2c6d25f | 952 | static void step_into_function (struct execution_control_state *ecs); |
d4f3574e | 953 | static void step_over_function (struct execution_control_state *ecs); |
104c1213 JM |
954 | static void stop_stepping (struct execution_control_state *ecs); |
955 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 956 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
957 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
958 | int stop_info); | |
104c1213 | 959 | |
cd0fc7c3 SS |
960 | /* Wait for control to return from inferior to debugger. |
961 | If inferior gets a signal, we may decide to start it up again | |
962 | instead of returning. That is why there is a loop in this function. | |
963 | When this function actually returns it means the inferior | |
964 | should be left stopped and GDB should read more commands. */ | |
965 | ||
966 | void | |
96baa820 | 967 | wait_for_inferior (void) |
cd0fc7c3 SS |
968 | { |
969 | struct cleanup *old_cleanups; | |
970 | struct execution_control_state ecss; | |
971 | struct execution_control_state *ecs; | |
c906108c | 972 | |
8601f500 | 973 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c SS |
974 | &step_resume_breakpoint); |
975 | make_cleanup (delete_breakpoint_current_contents, | |
976 | &through_sigtramp_breakpoint); | |
cd0fc7c3 SS |
977 | |
978 | /* wfi still stays in a loop, so it's OK just to take the address of | |
979 | a local to get the ecs pointer. */ | |
980 | ecs = &ecss; | |
981 | ||
982 | /* Fill in with reasonable starting values. */ | |
983 | init_execution_control_state (ecs); | |
984 | ||
c906108c | 985 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 986 | previous_inferior_ptid = inferior_ptid; |
c906108c | 987 | |
cd0fc7c3 SS |
988 | overlay_cache_invalid = 1; |
989 | ||
990 | /* We have to invalidate the registers BEFORE calling target_wait | |
991 | because they can be loaded from the target while in target_wait. | |
992 | This makes remote debugging a bit more efficient for those | |
993 | targets that provide critical registers as part of their normal | |
994 | status mechanism. */ | |
995 | ||
996 | registers_changed (); | |
b83266a0 | 997 | |
c906108c SS |
998 | while (1) |
999 | { | |
cd0fc7c3 | 1000 | if (target_wait_hook) |
39f77062 | 1001 | ecs->ptid = target_wait_hook (ecs->waiton_ptid, ecs->wp); |
cd0fc7c3 | 1002 | else |
39f77062 | 1003 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
c906108c | 1004 | |
cd0fc7c3 SS |
1005 | /* Now figure out what to do with the result of the result. */ |
1006 | handle_inferior_event (ecs); | |
c906108c | 1007 | |
cd0fc7c3 SS |
1008 | if (!ecs->wait_some_more) |
1009 | break; | |
1010 | } | |
1011 | do_cleanups (old_cleanups); | |
1012 | } | |
c906108c | 1013 | |
43ff13b4 JM |
1014 | /* Asynchronous version of wait_for_inferior. It is called by the |
1015 | event loop whenever a change of state is detected on the file | |
1016 | descriptor corresponding to the target. It can be called more than | |
1017 | once to complete a single execution command. In such cases we need | |
1018 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1019 | last time that this function is called for a single execution | |
1020 | command, then report to the user that the inferior has stopped, and | |
1021 | do the necessary cleanups. */ | |
1022 | ||
1023 | struct execution_control_state async_ecss; | |
1024 | struct execution_control_state *async_ecs; | |
1025 | ||
1026 | void | |
fba45db2 | 1027 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1028 | { |
1029 | static struct cleanup *old_cleanups; | |
1030 | ||
c5aa993b | 1031 | async_ecs = &async_ecss; |
43ff13b4 JM |
1032 | |
1033 | if (!async_ecs->wait_some_more) | |
1034 | { | |
488f131b | 1035 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
c5aa993b | 1036 | &step_resume_breakpoint); |
43ff13b4 | 1037 | make_exec_cleanup (delete_breakpoint_current_contents, |
c5aa993b | 1038 | &through_sigtramp_breakpoint); |
43ff13b4 JM |
1039 | |
1040 | /* Fill in with reasonable starting values. */ | |
1041 | init_execution_control_state (async_ecs); | |
1042 | ||
43ff13b4 | 1043 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1044 | previous_inferior_ptid = inferior_ptid; |
43ff13b4 JM |
1045 | |
1046 | overlay_cache_invalid = 1; | |
1047 | ||
1048 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1049 | because they can be loaded from the target while in target_wait. |
1050 | This makes remote debugging a bit more efficient for those | |
1051 | targets that provide critical registers as part of their normal | |
1052 | status mechanism. */ | |
43ff13b4 JM |
1053 | |
1054 | registers_changed (); | |
1055 | } | |
1056 | ||
1057 | if (target_wait_hook) | |
488f131b JB |
1058 | async_ecs->ptid = |
1059 | target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); | |
43ff13b4 | 1060 | else |
39f77062 | 1061 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 JM |
1062 | |
1063 | /* Now figure out what to do with the result of the result. */ | |
1064 | handle_inferior_event (async_ecs); | |
1065 | ||
1066 | if (!async_ecs->wait_some_more) | |
1067 | { | |
adf40b2e | 1068 | /* Do only the cleanups that have been added by this |
488f131b JB |
1069 | function. Let the continuations for the commands do the rest, |
1070 | if there are any. */ | |
43ff13b4 JM |
1071 | do_exec_cleanups (old_cleanups); |
1072 | normal_stop (); | |
c2d11a7d JM |
1073 | if (step_multi && stop_step) |
1074 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1075 | else | |
1076 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1077 | } |
1078 | } | |
1079 | ||
cd0fc7c3 SS |
1080 | /* Prepare an execution control state for looping through a |
1081 | wait_for_inferior-type loop. */ | |
1082 | ||
1083 | void | |
96baa820 | 1084 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1085 | { |
c2d11a7d | 1086 | /* ecs->another_trap? */ |
cd0fc7c3 SS |
1087 | ecs->random_signal = 0; |
1088 | ecs->remove_breakpoints_on_following_step = 0; | |
1089 | ecs->handling_longjmp = 0; /* FIXME */ | |
1090 | ecs->update_step_sp = 0; | |
1091 | ecs->stepping_through_solib_after_catch = 0; | |
1092 | ecs->stepping_through_solib_catchpoints = NULL; | |
1093 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1094 | ecs->stepping_through_sigtramp = 0; | |
1095 | ecs->sal = find_pc_line (prev_pc, 0); | |
1096 | ecs->current_line = ecs->sal.line; | |
1097 | ecs->current_symtab = ecs->sal.symtab; | |
1098 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1099 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1100 | ecs->wp = &(ecs->ws); |
1101 | } | |
1102 | ||
a0b3c4fd | 1103 | /* Call this function before setting step_resume_breakpoint, as a |
53a5351d JM |
1104 | sanity check. There should never be more than one step-resume |
1105 | breakpoint per thread, so we should never be setting a new | |
1106 | step_resume_breakpoint when one is already active. */ | |
a0b3c4fd | 1107 | static void |
96baa820 | 1108 | check_for_old_step_resume_breakpoint (void) |
a0b3c4fd JM |
1109 | { |
1110 | if (step_resume_breakpoint) | |
488f131b JB |
1111 | warning |
1112 | ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint"); | |
a0b3c4fd JM |
1113 | } |
1114 | ||
e02bc4cc DS |
1115 | /* Return the cached copy of the last pid/waitstatus returned by |
1116 | target_wait()/target_wait_hook(). The data is actually cached by | |
1117 | handle_inferior_event(), which gets called immediately after | |
1118 | target_wait()/target_wait_hook(). */ | |
1119 | ||
1120 | void | |
488f131b | 1121 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1122 | { |
39f77062 | 1123 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1124 | *status = target_last_waitstatus; |
1125 | } | |
1126 | ||
dd80620e MS |
1127 | /* Switch thread contexts, maintaining "infrun state". */ |
1128 | ||
1129 | static void | |
1130 | context_switch (struct execution_control_state *ecs) | |
1131 | { | |
1132 | /* Caution: it may happen that the new thread (or the old one!) | |
1133 | is not in the thread list. In this case we must not attempt | |
1134 | to "switch context", or we run the risk that our context may | |
1135 | be lost. This may happen as a result of the target module | |
1136 | mishandling thread creation. */ | |
1137 | ||
1138 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) | |
488f131b | 1139 | { /* Perform infrun state context switch: */ |
dd80620e | 1140 | /* Save infrun state for the old thread. */ |
488f131b JB |
1141 | save_infrun_state (inferior_ptid, prev_pc, |
1142 | prev_func_start, prev_func_name, | |
dd80620e | 1143 | trap_expected, step_resume_breakpoint, |
488f131b | 1144 | through_sigtramp_breakpoint, step_range_start, |
aa0cd9c1 | 1145 | step_range_end, &step_frame_id, |
dd80620e MS |
1146 | ecs->handling_longjmp, ecs->another_trap, |
1147 | ecs->stepping_through_solib_after_catch, | |
1148 | ecs->stepping_through_solib_catchpoints, | |
1149 | ecs->stepping_through_sigtramp, | |
488f131b | 1150 | ecs->current_line, ecs->current_symtab, step_sp); |
dd80620e MS |
1151 | |
1152 | /* Load infrun state for the new thread. */ | |
488f131b JB |
1153 | load_infrun_state (ecs->ptid, &prev_pc, |
1154 | &prev_func_start, &prev_func_name, | |
dd80620e | 1155 | &trap_expected, &step_resume_breakpoint, |
488f131b | 1156 | &through_sigtramp_breakpoint, &step_range_start, |
aa0cd9c1 | 1157 | &step_range_end, &step_frame_id, |
dd80620e MS |
1158 | &ecs->handling_longjmp, &ecs->another_trap, |
1159 | &ecs->stepping_through_solib_after_catch, | |
1160 | &ecs->stepping_through_solib_catchpoints, | |
488f131b JB |
1161 | &ecs->stepping_through_sigtramp, |
1162 | &ecs->current_line, &ecs->current_symtab, &step_sp); | |
dd80620e MS |
1163 | } |
1164 | inferior_ptid = ecs->ptid; | |
1165 | } | |
1166 | ||
1167 | ||
cd0fc7c3 SS |
1168 | /* Given an execution control state that has been freshly filled in |
1169 | by an event from the inferior, figure out what it means and take | |
1170 | appropriate action. */ | |
c906108c | 1171 | |
cd0fc7c3 | 1172 | void |
96baa820 | 1173 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 SS |
1174 | { |
1175 | CORE_ADDR tmp; | |
1176 | int stepped_after_stopped_by_watchpoint; | |
c8edd8b4 | 1177 | int sw_single_step_trap_p = 0; |
cd0fc7c3 | 1178 | |
e02bc4cc | 1179 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1180 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1181 | target_last_waitstatus = *ecs->wp; |
1182 | ||
488f131b JB |
1183 | switch (ecs->infwait_state) |
1184 | { | |
1185 | case infwait_thread_hop_state: | |
1186 | /* Cancel the waiton_ptid. */ | |
1187 | ecs->waiton_ptid = pid_to_ptid (-1); | |
1188 | /* Fall thru to the normal_state case. */ | |
b83266a0 | 1189 | |
488f131b JB |
1190 | case infwait_normal_state: |
1191 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event | |
1192 | is serviced in this loop, below. */ | |
1193 | if (ecs->enable_hw_watchpoints_after_wait) | |
1194 | { | |
1195 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1196 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1197 | } | |
1198 | stepped_after_stopped_by_watchpoint = 0; | |
1199 | break; | |
b83266a0 | 1200 | |
488f131b JB |
1201 | case infwait_nullified_state: |
1202 | break; | |
b83266a0 | 1203 | |
488f131b JB |
1204 | case infwait_nonstep_watch_state: |
1205 | insert_breakpoints (); | |
c906108c | 1206 | |
488f131b JB |
1207 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1208 | handle things like signals arriving and other things happening | |
1209 | in combination correctly? */ | |
1210 | stepped_after_stopped_by_watchpoint = 1; | |
1211 | break; | |
1212 | } | |
1213 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1214 | |
488f131b | 1215 | flush_cached_frames (); |
c906108c | 1216 | |
488f131b | 1217 | /* If it's a new process, add it to the thread database */ |
c906108c | 1218 | |
488f131b JB |
1219 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) |
1220 | && !in_thread_list (ecs->ptid)); | |
1221 | ||
1222 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1223 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1224 | { | |
1225 | add_thread (ecs->ptid); | |
c906108c | 1226 | |
488f131b JB |
1227 | ui_out_text (uiout, "[New "); |
1228 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); | |
1229 | ui_out_text (uiout, "]\n"); | |
c906108c SS |
1230 | |
1231 | #if 0 | |
488f131b JB |
1232 | /* NOTE: This block is ONLY meant to be invoked in case of a |
1233 | "thread creation event"! If it is invoked for any other | |
1234 | sort of event (such as a new thread landing on a breakpoint), | |
1235 | the event will be discarded, which is almost certainly | |
1236 | a bad thing! | |
1237 | ||
1238 | To avoid this, the low-level module (eg. target_wait) | |
1239 | should call in_thread_list and add_thread, so that the | |
1240 | new thread is known by the time we get here. */ | |
1241 | ||
1242 | /* We may want to consider not doing a resume here in order | |
1243 | to give the user a chance to play with the new thread. | |
1244 | It might be good to make that a user-settable option. */ | |
1245 | ||
1246 | /* At this point, all threads are stopped (happens | |
1247 | automatically in either the OS or the native code). | |
1248 | Therefore we need to continue all threads in order to | |
1249 | make progress. */ | |
1250 | ||
1251 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1252 | prepare_to_wait (ecs); | |
1253 | return; | |
c906108c | 1254 | #endif |
488f131b | 1255 | } |
c906108c | 1256 | |
488f131b JB |
1257 | switch (ecs->ws.kind) |
1258 | { | |
1259 | case TARGET_WAITKIND_LOADED: | |
1260 | /* Ignore gracefully during startup of the inferior, as it | |
1261 | might be the shell which has just loaded some objects, | |
1262 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1263 | #ifdef SOLIB_ADD |
488f131b JB |
1264 | if (!stop_soon_quietly) |
1265 | { | |
1266 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1267 | breakpoint addresses via breakpoint_re_set. */ | |
1268 | if (breakpoints_inserted) | |
1269 | remove_breakpoints (); | |
c906108c | 1270 | |
488f131b JB |
1271 | /* Check for any newly added shared libraries if we're |
1272 | supposed to be adding them automatically. Switch | |
1273 | terminal for any messages produced by | |
1274 | breakpoint_re_set. */ | |
1275 | target_terminal_ours_for_output (); | |
1276 | SOLIB_ADD (NULL, 0, NULL, auto_solib_add); | |
1277 | target_terminal_inferior (); | |
1278 | ||
1279 | /* Reinsert breakpoints and continue. */ | |
1280 | if (breakpoints_inserted) | |
1281 | insert_breakpoints (); | |
1282 | } | |
c906108c | 1283 | #endif |
488f131b JB |
1284 | resume (0, TARGET_SIGNAL_0); |
1285 | prepare_to_wait (ecs); | |
1286 | return; | |
c5aa993b | 1287 | |
488f131b JB |
1288 | case TARGET_WAITKIND_SPURIOUS: |
1289 | resume (0, TARGET_SIGNAL_0); | |
1290 | prepare_to_wait (ecs); | |
1291 | return; | |
c5aa993b | 1292 | |
488f131b JB |
1293 | case TARGET_WAITKIND_EXITED: |
1294 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
1295 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
1296 | ||
1297 | /* Record the exit code in the convenience variable $_exitcode, so | |
1298 | that the user can inspect this again later. */ | |
1299 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1300 | value_from_longest (builtin_type_int, | |
1301 | (LONGEST) ecs->ws.value.integer)); | |
1302 | gdb_flush (gdb_stdout); | |
1303 | target_mourn_inferior (); | |
1304 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1305 | stop_print_frame = 0; | |
1306 | stop_stepping (ecs); | |
1307 | return; | |
c5aa993b | 1308 | |
488f131b JB |
1309 | case TARGET_WAITKIND_SIGNALLED: |
1310 | stop_print_frame = 0; | |
1311 | stop_signal = ecs->ws.value.sig; | |
1312 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1313 | |
488f131b JB |
1314 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1315 | reach here unless the inferior is dead. However, for years | |
1316 | target_kill() was called here, which hints that fatal signals aren't | |
1317 | really fatal on some systems. If that's true, then some changes | |
1318 | may be needed. */ | |
1319 | target_mourn_inferior (); | |
c906108c | 1320 | |
488f131b JB |
1321 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
1322 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ | |
1323 | stop_stepping (ecs); | |
1324 | return; | |
c906108c | 1325 | |
488f131b JB |
1326 | /* The following are the only cases in which we keep going; |
1327 | the above cases end in a continue or goto. */ | |
1328 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 1329 | case TARGET_WAITKIND_VFORKED: |
488f131b JB |
1330 | stop_signal = TARGET_SIGNAL_TRAP; |
1331 | pending_follow.kind = ecs->ws.kind; | |
1332 | ||
8e7d2c16 DJ |
1333 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
1334 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
c906108c | 1335 | |
488f131b | 1336 | stop_pc = read_pc (); |
675bf4cb DJ |
1337 | |
1338 | /* Assume that catchpoints are not really software breakpoints. If | |
1339 | some future target implements them using software breakpoints then | |
1340 | that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus | |
1341 | we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that | |
1342 | bpstat_stop_status will not decrement the PC. */ | |
1343 | ||
1344 | stop_bpstat = bpstat_stop_status (&stop_pc, 1); | |
1345 | ||
488f131b | 1346 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
04e68871 DJ |
1347 | |
1348 | /* If no catchpoint triggered for this, then keep going. */ | |
1349 | if (ecs->random_signal) | |
1350 | { | |
1351 | stop_signal = TARGET_SIGNAL_0; | |
1352 | keep_going (ecs); | |
1353 | return; | |
1354 | } | |
488f131b JB |
1355 | goto process_event_stop_test; |
1356 | ||
1357 | case TARGET_WAITKIND_EXECD: | |
1358 | stop_signal = TARGET_SIGNAL_TRAP; | |
1359 | ||
7d2830a3 DJ |
1360 | /* NOTE drow/2002-12-05: This code should be pushed down into the |
1361 | target_wait function. Until then following vfork on HP/UX 10.20 | |
1362 | is probably broken by this. Of course, it's broken anyway. */ | |
488f131b JB |
1363 | /* Is this a target which reports multiple exec events per actual |
1364 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1365 | ignore all but the last one. Just resume the exec'r, and wait | |
1366 | for the next exec event. */ | |
1367 | if (inferior_ignoring_leading_exec_events) | |
1368 | { | |
1369 | inferior_ignoring_leading_exec_events--; | |
1370 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1371 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event. | |
1372 | parent_pid); | |
1373 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); | |
1374 | prepare_to_wait (ecs); | |
1375 | return; | |
1376 | } | |
1377 | inferior_ignoring_leading_exec_events = | |
1378 | target_reported_exec_events_per_exec_call () - 1; | |
1379 | ||
1380 | pending_follow.execd_pathname = | |
1381 | savestring (ecs->ws.value.execd_pathname, | |
1382 | strlen (ecs->ws.value.execd_pathname)); | |
1383 | ||
488f131b JB |
1384 | /* This causes the eventpoints and symbol table to be reset. Must |
1385 | do this now, before trying to determine whether to stop. */ | |
1386 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); | |
1387 | xfree (pending_follow.execd_pathname); | |
c906108c | 1388 | |
488f131b JB |
1389 | stop_pc = read_pc_pid (ecs->ptid); |
1390 | ecs->saved_inferior_ptid = inferior_ptid; | |
1391 | inferior_ptid = ecs->ptid; | |
675bf4cb DJ |
1392 | |
1393 | /* Assume that catchpoints are not really software breakpoints. If | |
1394 | some future target implements them using software breakpoints then | |
1395 | that target is responsible for fudging DECR_PC_AFTER_BREAK. Thus | |
1396 | we pass 1 for the NOT_A_SW_BREAKPOINT argument, so that | |
1397 | bpstat_stop_status will not decrement the PC. */ | |
1398 | ||
1399 | stop_bpstat = bpstat_stop_status (&stop_pc, 1); | |
1400 | ||
488f131b JB |
1401 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1402 | inferior_ptid = ecs->saved_inferior_ptid; | |
04e68871 DJ |
1403 | |
1404 | /* If no catchpoint triggered for this, then keep going. */ | |
1405 | if (ecs->random_signal) | |
1406 | { | |
1407 | stop_signal = TARGET_SIGNAL_0; | |
1408 | keep_going (ecs); | |
1409 | return; | |
1410 | } | |
488f131b JB |
1411 | goto process_event_stop_test; |
1412 | ||
1413 | /* These syscall events are returned on HP-UX, as part of its | |
1414 | implementation of page-protection-based "hardware" watchpoints. | |
1415 | HP-UX has unfortunate interactions between page-protections and | |
1416 | some system calls. Our solution is to disable hardware watches | |
1417 | when a system call is entered, and reenable them when the syscall | |
1418 | completes. The downside of this is that we may miss the precise | |
1419 | point at which a watched piece of memory is modified. "Oh well." | |
1420 | ||
1421 | Note that we may have multiple threads running, which may each | |
1422 | enter syscalls at roughly the same time. Since we don't have a | |
1423 | good notion currently of whether a watched piece of memory is | |
1424 | thread-private, we'd best not have any page-protections active | |
1425 | when any thread is in a syscall. Thus, we only want to reenable | |
1426 | hardware watches when no threads are in a syscall. | |
1427 | ||
1428 | Also, be careful not to try to gather much state about a thread | |
1429 | that's in a syscall. It's frequently a losing proposition. */ | |
1430 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
1431 | number_of_threads_in_syscalls++; | |
1432 | if (number_of_threads_in_syscalls == 1) | |
1433 | { | |
1434 | TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); | |
1435 | } | |
1436 | resume (0, TARGET_SIGNAL_0); | |
1437 | prepare_to_wait (ecs); | |
1438 | return; | |
c906108c | 1439 | |
488f131b JB |
1440 | /* Before examining the threads further, step this thread to |
1441 | get it entirely out of the syscall. (We get notice of the | |
1442 | event when the thread is just on the verge of exiting a | |
1443 | syscall. Stepping one instruction seems to get it back | |
1444 | into user code.) | |
c906108c | 1445 | |
488f131b JB |
1446 | Note that although the logical place to reenable h/w watches |
1447 | is here, we cannot. We cannot reenable them before stepping | |
1448 | the thread (this causes the next wait on the thread to hang). | |
c4093a6a | 1449 | |
488f131b JB |
1450 | Nor can we enable them after stepping until we've done a wait. |
1451 | Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait | |
1452 | here, which will be serviced immediately after the target | |
1453 | is waited on. */ | |
1454 | case TARGET_WAITKIND_SYSCALL_RETURN: | |
1455 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); | |
1456 | ||
1457 | if (number_of_threads_in_syscalls > 0) | |
1458 | { | |
1459 | number_of_threads_in_syscalls--; | |
1460 | ecs->enable_hw_watchpoints_after_wait = | |
1461 | (number_of_threads_in_syscalls == 0); | |
1462 | } | |
1463 | prepare_to_wait (ecs); | |
1464 | return; | |
c906108c | 1465 | |
488f131b JB |
1466 | case TARGET_WAITKIND_STOPPED: |
1467 | stop_signal = ecs->ws.value.sig; | |
1468 | break; | |
c906108c | 1469 | |
488f131b JB |
1470 | /* We had an event in the inferior, but we are not interested |
1471 | in handling it at this level. The lower layers have already | |
8e7d2c16 DJ |
1472 | done what needs to be done, if anything. |
1473 | ||
1474 | One of the possible circumstances for this is when the | |
1475 | inferior produces output for the console. The inferior has | |
1476 | not stopped, and we are ignoring the event. Another possible | |
1477 | circumstance is any event which the lower level knows will be | |
1478 | reported multiple times without an intervening resume. */ | |
488f131b | 1479 | case TARGET_WAITKIND_IGNORE: |
8e7d2c16 | 1480 | prepare_to_wait (ecs); |
488f131b JB |
1481 | return; |
1482 | } | |
c906108c | 1483 | |
488f131b JB |
1484 | /* We may want to consider not doing a resume here in order to give |
1485 | the user a chance to play with the new thread. It might be good | |
1486 | to make that a user-settable option. */ | |
c906108c | 1487 | |
488f131b JB |
1488 | /* At this point, all threads are stopped (happens automatically in |
1489 | either the OS or the native code). Therefore we need to continue | |
1490 | all threads in order to make progress. */ | |
1491 | if (ecs->new_thread_event) | |
1492 | { | |
1493 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); | |
1494 | prepare_to_wait (ecs); | |
1495 | return; | |
1496 | } | |
c906108c | 1497 | |
488f131b JB |
1498 | stop_pc = read_pc_pid (ecs->ptid); |
1499 | ||
1500 | /* See if a thread hit a thread-specific breakpoint that was meant for | |
1501 | another thread. If so, then step that thread past the breakpoint, | |
1502 | and continue it. */ | |
1503 | ||
1504 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1505 | { | |
f8d40ec8 JB |
1506 | /* Check if a regular breakpoint has been hit before checking |
1507 | for a potential single step breakpoint. Otherwise, GDB will | |
1508 | not see this breakpoint hit when stepping onto breakpoints. */ | |
1509 | if (breakpoints_inserted | |
1510 | && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK)) | |
488f131b | 1511 | { |
c5aa993b | 1512 | ecs->random_signal = 0; |
488f131b JB |
1513 | if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, |
1514 | ecs->ptid)) | |
1515 | { | |
1516 | int remove_status; | |
1517 | ||
1518 | /* Saw a breakpoint, but it was hit by the wrong thread. | |
1519 | Just continue. */ | |
1520 | if (DECR_PC_AFTER_BREAK) | |
1521 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, ecs->ptid); | |
1522 | ||
1523 | remove_status = remove_breakpoints (); | |
1524 | /* Did we fail to remove breakpoints? If so, try | |
1525 | to set the PC past the bp. (There's at least | |
1526 | one situation in which we can fail to remove | |
1527 | the bp's: On HP-UX's that use ttrace, we can't | |
1528 | change the address space of a vforking child | |
1529 | process until the child exits (well, okay, not | |
1530 | then either :-) or execs. */ | |
1531 | if (remove_status != 0) | |
1532 | { | |
1533 | /* FIXME! This is obviously non-portable! */ | |
1534 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, ecs->ptid); | |
1535 | /* We need to restart all the threads now, | |
1536 | * unles we're running in scheduler-locked mode. | |
1537 | * Use currently_stepping to determine whether to | |
1538 | * step or continue. | |
1539 | */ | |
1540 | /* FIXME MVS: is there any reason not to call resume()? */ | |
1541 | if (scheduler_mode == schedlock_on) | |
1542 | target_resume (ecs->ptid, | |
1543 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1544 | else | |
1545 | target_resume (RESUME_ALL, | |
1546 | currently_stepping (ecs), TARGET_SIGNAL_0); | |
1547 | prepare_to_wait (ecs); | |
1548 | return; | |
1549 | } | |
1550 | else | |
1551 | { /* Single step */ | |
1552 | breakpoints_inserted = 0; | |
1553 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
1554 | context_switch (ecs); | |
1555 | ecs->waiton_ptid = ecs->ptid; | |
1556 | ecs->wp = &(ecs->ws); | |
1557 | ecs->another_trap = 1; | |
1558 | ||
1559 | ecs->infwait_state = infwait_thread_hop_state; | |
1560 | keep_going (ecs); | |
1561 | registers_changed (); | |
1562 | return; | |
1563 | } | |
1564 | } | |
1565 | } | |
f8d40ec8 JB |
1566 | else if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1567 | { | |
c8edd8b4 JB |
1568 | /* Readjust the stop_pc as it is off by DECR_PC_AFTER_BREAK |
1569 | compared to the value it would have if the system stepping | |
1570 | capability was used. This allows the rest of the code in | |
1571 | this function to use this address without having to worry | |
1572 | whether software single step is in use or not. */ | |
1573 | if (DECR_PC_AFTER_BREAK) | |
1574 | { | |
1575 | stop_pc -= DECR_PC_AFTER_BREAK; | |
1576 | write_pc_pid (stop_pc, ecs->ptid); | |
1577 | } | |
1578 | ||
1579 | sw_single_step_trap_p = 1; | |
f8d40ec8 JB |
1580 | ecs->random_signal = 0; |
1581 | } | |
488f131b JB |
1582 | } |
1583 | else | |
1584 | ecs->random_signal = 1; | |
c906108c | 1585 | |
488f131b JB |
1586 | /* See if something interesting happened to the non-current thread. If |
1587 | so, then switch to that thread, and eventually give control back to | |
1588 | the user. | |
1589 | ||
1590 | Note that if there's any kind of pending follow (i.e., of a fork, | |
1591 | vfork or exec), we don't want to do this now. Rather, we'll let | |
1592 | the next resume handle it. */ | |
1593 | if (!ptid_equal (ecs->ptid, inferior_ptid) && | |
1594 | (pending_follow.kind == TARGET_WAITKIND_SPURIOUS)) | |
1595 | { | |
1596 | int printed = 0; | |
1597 | ||
1598 | /* If it's a random signal for a non-current thread, notify user | |
1599 | if he's expressed an interest. */ | |
1600 | if (ecs->random_signal && signal_print[stop_signal]) | |
1601 | { | |
c906108c SS |
1602 | /* ??rehrauer: I don't understand the rationale for this code. If the |
1603 | inferior will stop as a result of this signal, then the act of handling | |
1604 | the stop ought to print a message that's couches the stoppage in user | |
1605 | terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior | |
1606 | won't stop as a result of the signal -- i.e., if the signal is merely | |
1607 | a side-effect of something GDB's doing "under the covers" for the | |
1608 | user, such as stepping threads over a breakpoint they shouldn't stop | |
1609 | for -- then the message seems to be a serious annoyance at best. | |
1610 | ||
1611 | For now, remove the message altogether. */ | |
1612 | #if 0 | |
488f131b JB |
1613 | printed = 1; |
1614 | target_terminal_ours_for_output (); | |
1615 | printf_filtered ("\nProgram received signal %s, %s.\n", | |
1616 | target_signal_to_name (stop_signal), | |
1617 | target_signal_to_string (stop_signal)); | |
1618 | gdb_flush (gdb_stdout); | |
c906108c | 1619 | #endif |
488f131b | 1620 | } |
c906108c | 1621 | |
488f131b JB |
1622 | /* If it's not SIGTRAP and not a signal we want to stop for, then |
1623 | continue the thread. */ | |
c906108c | 1624 | |
488f131b JB |
1625 | if (stop_signal != TARGET_SIGNAL_TRAP && !signal_stop[stop_signal]) |
1626 | { | |
1627 | if (printed) | |
1628 | target_terminal_inferior (); | |
c906108c | 1629 | |
488f131b JB |
1630 | /* Clear the signal if it should not be passed. */ |
1631 | if (signal_program[stop_signal] == 0) | |
1632 | stop_signal = TARGET_SIGNAL_0; | |
c906108c | 1633 | |
488f131b JB |
1634 | target_resume (ecs->ptid, 0, stop_signal); |
1635 | prepare_to_wait (ecs); | |
1636 | return; | |
1637 | } | |
c906108c | 1638 | |
488f131b JB |
1639 | /* It's a SIGTRAP or a signal we're interested in. Switch threads, |
1640 | and fall into the rest of wait_for_inferior(). */ | |
c5aa993b | 1641 | |
488f131b | 1642 | context_switch (ecs); |
c5aa993b | 1643 | |
488f131b JB |
1644 | if (context_hook) |
1645 | context_hook (pid_to_thread_id (ecs->ptid)); | |
c5aa993b | 1646 | |
488f131b JB |
1647 | flush_cached_frames (); |
1648 | } | |
c906108c | 1649 | |
488f131b JB |
1650 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
1651 | { | |
1652 | /* Pull the single step breakpoints out of the target. */ | |
1653 | SOFTWARE_SINGLE_STEP (0, 0); | |
1654 | singlestep_breakpoints_inserted_p = 0; | |
1655 | } | |
c906108c | 1656 | |
488f131b JB |
1657 | /* If PC is pointing at a nullified instruction, then step beyond |
1658 | it so that the user won't be confused when GDB appears to be ready | |
1659 | to execute it. */ | |
c906108c | 1660 | |
488f131b JB |
1661 | /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */ |
1662 | if (INSTRUCTION_NULLIFIED) | |
1663 | { | |
1664 | registers_changed (); | |
1665 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); | |
c906108c | 1666 | |
488f131b JB |
1667 | /* We may have received a signal that we want to pass to |
1668 | the inferior; therefore, we must not clobber the waitstatus | |
1669 | in WS. */ | |
c906108c | 1670 | |
488f131b JB |
1671 | ecs->infwait_state = infwait_nullified_state; |
1672 | ecs->waiton_ptid = ecs->ptid; | |
1673 | ecs->wp = &(ecs->tmpstatus); | |
1674 | prepare_to_wait (ecs); | |
1675 | return; | |
1676 | } | |
c906108c | 1677 | |
488f131b JB |
1678 | /* It may not be necessary to disable the watchpoint to stop over |
1679 | it. For example, the PA can (with some kernel cooperation) | |
1680 | single step over a watchpoint without disabling the watchpoint. */ | |
1681 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1682 | { | |
1683 | resume (1, 0); | |
1684 | prepare_to_wait (ecs); | |
1685 | return; | |
1686 | } | |
c906108c | 1687 | |
488f131b JB |
1688 | /* It is far more common to need to disable a watchpoint to step |
1689 | the inferior over it. FIXME. What else might a debug | |
1690 | register or page protection watchpoint scheme need here? */ | |
1691 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1692 | { | |
1693 | /* At this point, we are stopped at an instruction which has | |
1694 | attempted to write to a piece of memory under control of | |
1695 | a watchpoint. The instruction hasn't actually executed | |
1696 | yet. If we were to evaluate the watchpoint expression | |
1697 | now, we would get the old value, and therefore no change | |
1698 | would seem to have occurred. | |
1699 | ||
1700 | In order to make watchpoints work `right', we really need | |
1701 | to complete the memory write, and then evaluate the | |
1702 | watchpoint expression. The following code does that by | |
1703 | removing the watchpoint (actually, all watchpoints and | |
1704 | breakpoints), single-stepping the target, re-inserting | |
1705 | watchpoints, and then falling through to let normal | |
1706 | single-step processing handle proceed. Since this | |
1707 | includes evaluating watchpoints, things will come to a | |
1708 | stop in the correct manner. */ | |
1709 | ||
1710 | if (DECR_PC_AFTER_BREAK) | |
1711 | write_pc (stop_pc - DECR_PC_AFTER_BREAK); | |
c5aa993b | 1712 | |
488f131b JB |
1713 | remove_breakpoints (); |
1714 | registers_changed (); | |
1715 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
c5aa993b | 1716 | |
488f131b JB |
1717 | ecs->waiton_ptid = ecs->ptid; |
1718 | ecs->wp = &(ecs->ws); | |
1719 | ecs->infwait_state = infwait_nonstep_watch_state; | |
1720 | prepare_to_wait (ecs); | |
1721 | return; | |
1722 | } | |
1723 | ||
1724 | /* It may be possible to simply continue after a watchpoint. */ | |
1725 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
1726 | STOPPED_BY_WATCHPOINT (ecs->ws); | |
1727 | ||
1728 | ecs->stop_func_start = 0; | |
1729 | ecs->stop_func_end = 0; | |
1730 | ecs->stop_func_name = 0; | |
1731 | /* Don't care about return value; stop_func_start and stop_func_name | |
1732 | will both be 0 if it doesn't work. */ | |
1733 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
1734 | &ecs->stop_func_start, &ecs->stop_func_end); | |
1735 | ecs->stop_func_start += FUNCTION_START_OFFSET; | |
1736 | ecs->another_trap = 0; | |
1737 | bpstat_clear (&stop_bpstat); | |
1738 | stop_step = 0; | |
1739 | stop_stack_dummy = 0; | |
1740 | stop_print_frame = 1; | |
1741 | ecs->random_signal = 0; | |
1742 | stopped_by_random_signal = 0; | |
1743 | breakpoints_failed = 0; | |
1744 | ||
1745 | /* Look at the cause of the stop, and decide what to do. | |
1746 | The alternatives are: | |
1747 | 1) break; to really stop and return to the debugger, | |
1748 | 2) drop through to start up again | |
1749 | (set ecs->another_trap to 1 to single step once) | |
1750 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
1751 | will be made according to the signal handling tables. */ | |
1752 | ||
1753 | /* First, distinguish signals caused by the debugger from signals | |
1754 | that have to do with the program's own actions. | |
1755 | Note that breakpoint insns may cause SIGTRAP or SIGILL | |
1756 | or SIGEMT, depending on the operating system version. | |
1757 | Here we detect when a SIGILL or SIGEMT is really a breakpoint | |
1758 | and change it to SIGTRAP. */ | |
1759 | ||
1760 | if (stop_signal == TARGET_SIGNAL_TRAP | |
1761 | || (breakpoints_inserted && | |
1762 | (stop_signal == TARGET_SIGNAL_ILL | |
1763 | || stop_signal == TARGET_SIGNAL_EMT)) || stop_soon_quietly) | |
1764 | { | |
1765 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
1766 | { | |
1767 | stop_print_frame = 0; | |
1768 | stop_stepping (ecs); | |
1769 | return; | |
1770 | } | |
1771 | if (stop_soon_quietly) | |
1772 | { | |
1773 | stop_stepping (ecs); | |
1774 | return; | |
1775 | } | |
1776 | ||
1777 | /* Don't even think about breakpoints | |
1778 | if just proceeded over a breakpoint. | |
1779 | ||
1780 | However, if we are trying to proceed over a breakpoint | |
1781 | and end up in sigtramp, then through_sigtramp_breakpoint | |
1782 | will be set and we should check whether we've hit the | |
1783 | step breakpoint. */ | |
1784 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected | |
1785 | && through_sigtramp_breakpoint == NULL) | |
1786 | bpstat_clear (&stop_bpstat); | |
1787 | else | |
1788 | { | |
1789 | /* See if there is a breakpoint at the current PC. */ | |
1790 | ||
1791 | /* The second argument of bpstat_stop_status is meant to help | |
1792 | distinguish between a breakpoint trap and a singlestep trap. | |
1793 | This is only important on targets where DECR_PC_AFTER_BREAK | |
1794 | is non-zero. The prev_pc test is meant to distinguish between | |
1795 | singlestepping a trap instruction, and singlestepping thru a | |
3e6564e1 JB |
1796 | jump to the instruction following a trap instruction. |
1797 | ||
1798 | Therefore, pass TRUE if our reason for stopping is | |
1799 | something other than hitting a breakpoint. We do this by | |
1800 | checking that either: we detected earlier a software single | |
1801 | step trap or, 1) stepping is going on and 2) we didn't hit | |
1802 | a breakpoint in a signal handler without an intervening stop | |
1803 | in sigtramp, which is detected by a new stack pointer value | |
1804 | below any usual function calling stack adjustments. */ | |
238617f6 JB |
1805 | stop_bpstat = |
1806 | bpstat_stop_status | |
1807 | (&stop_pc, | |
c8edd8b4 JB |
1808 | sw_single_step_trap_p |
1809 | || (currently_stepping (ecs) | |
1810 | && prev_pc != stop_pc - DECR_PC_AFTER_BREAK | |
1811 | && !(step_range_end | |
1812 | && INNER_THAN (read_sp (), (step_sp - 16))))); | |
488f131b JB |
1813 | /* Following in case break condition called a |
1814 | function. */ | |
1815 | stop_print_frame = 1; | |
1816 | } | |
1817 | ||
1818 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
1819 | ecs->random_signal | |
1820 | = !(bpstat_explains_signal (stop_bpstat) | |
1821 | || trap_expected | |
1822 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P | |
ae45cd16 | 1823 | && DEPRECATED_PC_IN_CALL_DUMMY (stop_pc, read_sp (), |
c193f6ac | 1824 | get_frame_base (get_current_frame ()))) |
488f131b JB |
1825 | || (step_range_end && step_resume_breakpoint == NULL)); |
1826 | ||
1827 | else | |
1828 | { | |
1829 | ecs->random_signal = !(bpstat_explains_signal (stop_bpstat) | |
1830 | /* End of a stack dummy. Some systems (e.g. Sony | |
1831 | news) give another signal besides SIGTRAP, so | |
1832 | check here as well as above. */ | |
1833 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P | |
ae45cd16 | 1834 | && DEPRECATED_PC_IN_CALL_DUMMY (stop_pc, read_sp (), |
c193f6ac | 1835 | get_frame_base |
488f131b JB |
1836 | (get_current_frame |
1837 | ())))); | |
1838 | if (!ecs->random_signal) | |
1839 | stop_signal = TARGET_SIGNAL_TRAP; | |
1840 | } | |
1841 | } | |
1842 | ||
1843 | /* When we reach this point, we've pretty much decided | |
1844 | that the reason for stopping must've been a random | |
1845 | (unexpected) signal. */ | |
1846 | ||
1847 | else | |
1848 | ecs->random_signal = 1; | |
488f131b | 1849 | |
04e68871 | 1850 | process_event_stop_test: |
488f131b JB |
1851 | /* For the program's own signals, act according to |
1852 | the signal handling tables. */ | |
1853 | ||
1854 | if (ecs->random_signal) | |
1855 | { | |
1856 | /* Signal not for debugging purposes. */ | |
1857 | int printed = 0; | |
1858 | ||
1859 | stopped_by_random_signal = 1; | |
1860 | ||
1861 | if (signal_print[stop_signal]) | |
1862 | { | |
1863 | printed = 1; | |
1864 | target_terminal_ours_for_output (); | |
1865 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
1866 | } | |
1867 | if (signal_stop[stop_signal]) | |
1868 | { | |
1869 | stop_stepping (ecs); | |
1870 | return; | |
1871 | } | |
1872 | /* If not going to stop, give terminal back | |
1873 | if we took it away. */ | |
1874 | else if (printed) | |
1875 | target_terminal_inferior (); | |
1876 | ||
1877 | /* Clear the signal if it should not be passed. */ | |
1878 | if (signal_program[stop_signal] == 0) | |
1879 | stop_signal = TARGET_SIGNAL_0; | |
1880 | ||
1881 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
1882 | whether it could/should be keep_going. | |
1883 | ||
1884 | This used to jump to step_over_function if we are stepping, | |
1885 | which is wrong. | |
1886 | ||
1887 | Suppose the user does a `next' over a function call, and while | |
1888 | that call is in progress, the inferior receives a signal for | |
1889 | which GDB does not stop (i.e., signal_stop[SIG] is false). In | |
1890 | that case, when we reach this point, there is already a | |
1891 | step-resume breakpoint established, right where it should be: | |
1892 | immediately after the function call the user is "next"-ing | |
1893 | over. If we call step_over_function now, two bad things | |
1894 | happen: | |
1895 | ||
1896 | - we'll create a new breakpoint, at wherever the current | |
1897 | frame's return address happens to be. That could be | |
1898 | anywhere, depending on what function call happens to be on | |
1899 | the top of the stack at that point. Point is, it's probably | |
1900 | not where we need it. | |
1901 | ||
1902 | - the existing step-resume breakpoint (which is at the correct | |
1903 | address) will get orphaned: step_resume_breakpoint will point | |
1904 | to the new breakpoint, and the old step-resume breakpoint | |
1905 | will never be cleaned up. | |
1906 | ||
1907 | The old behavior was meant to help HP-UX single-step out of | |
1908 | sigtramps. It would place the new breakpoint at prev_pc, which | |
1909 | was certainly wrong. I don't know the details there, so fixing | |
1910 | this probably breaks that. As with anything else, it's up to | |
1911 | the HP-UX maintainer to furnish a fix that doesn't break other | |
1912 | platforms. --JimB, 20 May 1999 */ | |
1913 | check_sigtramp2 (ecs); | |
1914 | keep_going (ecs); | |
1915 | return; | |
1916 | } | |
1917 | ||
1918 | /* Handle cases caused by hitting a breakpoint. */ | |
1919 | { | |
1920 | CORE_ADDR jmp_buf_pc; | |
1921 | struct bpstat_what what; | |
1922 | ||
1923 | what = bpstat_what (stop_bpstat); | |
1924 | ||
1925 | if (what.call_dummy) | |
1926 | { | |
1927 | stop_stack_dummy = 1; | |
1928 | #ifdef HP_OS_BUG | |
1929 | trap_expected_after_continue = 1; | |
1930 | #endif | |
c5aa993b | 1931 | } |
c906108c | 1932 | |
488f131b | 1933 | switch (what.main_action) |
c5aa993b | 1934 | { |
488f131b JB |
1935 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
1936 | /* If we hit the breakpoint at longjmp, disable it for the | |
1937 | duration of this command. Then, install a temporary | |
1938 | breakpoint at the target of the jmp_buf. */ | |
1939 | disable_longjmp_breakpoint (); | |
1940 | remove_breakpoints (); | |
1941 | breakpoints_inserted = 0; | |
1942 | if (!GET_LONGJMP_TARGET_P () || !GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
c5aa993b | 1943 | { |
488f131b | 1944 | keep_going (ecs); |
104c1213 | 1945 | return; |
c5aa993b | 1946 | } |
488f131b JB |
1947 | |
1948 | /* Need to blow away step-resume breakpoint, as it | |
1949 | interferes with us */ | |
1950 | if (step_resume_breakpoint != NULL) | |
104c1213 | 1951 | { |
488f131b | 1952 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
104c1213 | 1953 | } |
488f131b JB |
1954 | /* Not sure whether we need to blow this away too, but probably |
1955 | it is like the step-resume breakpoint. */ | |
1956 | if (through_sigtramp_breakpoint != NULL) | |
c5aa993b | 1957 | { |
488f131b JB |
1958 | delete_breakpoint (through_sigtramp_breakpoint); |
1959 | through_sigtramp_breakpoint = NULL; | |
c5aa993b | 1960 | } |
c906108c | 1961 | |
488f131b JB |
1962 | #if 0 |
1963 | /* FIXME - Need to implement nested temporary breakpoints */ | |
1964 | if (step_over_calls > 0) | |
1965 | set_longjmp_resume_breakpoint (jmp_buf_pc, get_current_frame ()); | |
c5aa993b | 1966 | else |
488f131b | 1967 | #endif /* 0 */ |
818dd999 | 1968 | set_longjmp_resume_breakpoint (jmp_buf_pc, null_frame_id); |
488f131b JB |
1969 | ecs->handling_longjmp = 1; /* FIXME */ |
1970 | keep_going (ecs); | |
1971 | return; | |
c906108c | 1972 | |
488f131b JB |
1973 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
1974 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
1975 | remove_breakpoints (); | |
1976 | breakpoints_inserted = 0; | |
1977 | #if 0 | |
1978 | /* FIXME - Need to implement nested temporary breakpoints */ | |
1979 | if (step_over_calls | |
aa0cd9c1 AC |
1980 | && (frame_id_inner (get_frame_id (get_current_frame ()), |
1981 | step_frame_id))) | |
c5aa993b | 1982 | { |
488f131b | 1983 | ecs->another_trap = 1; |
d4f3574e SS |
1984 | keep_going (ecs); |
1985 | return; | |
c5aa993b | 1986 | } |
488f131b JB |
1987 | #endif /* 0 */ |
1988 | disable_longjmp_breakpoint (); | |
1989 | ecs->handling_longjmp = 0; /* FIXME */ | |
1990 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
1991 | break; | |
1992 | /* else fallthrough */ | |
1993 | ||
1994 | case BPSTAT_WHAT_SINGLE: | |
1995 | if (breakpoints_inserted) | |
c5aa993b | 1996 | { |
488f131b | 1997 | remove_breakpoints (); |
c5aa993b | 1998 | } |
488f131b JB |
1999 | breakpoints_inserted = 0; |
2000 | ecs->another_trap = 1; | |
2001 | /* Still need to check other stuff, at least the case | |
2002 | where we are stepping and step out of the right range. */ | |
2003 | break; | |
c906108c | 2004 | |
488f131b JB |
2005 | case BPSTAT_WHAT_STOP_NOISY: |
2006 | stop_print_frame = 1; | |
c906108c | 2007 | |
488f131b JB |
2008 | /* We are about to nuke the step_resume_breakpoint and |
2009 | through_sigtramp_breakpoint via the cleanup chain, so | |
2010 | no need to worry about it here. */ | |
c5aa993b | 2011 | |
488f131b JB |
2012 | stop_stepping (ecs); |
2013 | return; | |
c5aa993b | 2014 | |
488f131b JB |
2015 | case BPSTAT_WHAT_STOP_SILENT: |
2016 | stop_print_frame = 0; | |
c5aa993b | 2017 | |
488f131b JB |
2018 | /* We are about to nuke the step_resume_breakpoint and |
2019 | through_sigtramp_breakpoint via the cleanup chain, so | |
2020 | no need to worry about it here. */ | |
c5aa993b | 2021 | |
488f131b | 2022 | stop_stepping (ecs); |
e441088d | 2023 | return; |
c5aa993b | 2024 | |
488f131b JB |
2025 | case BPSTAT_WHAT_STEP_RESUME: |
2026 | /* This proably demands a more elegant solution, but, yeah | |
2027 | right... | |
c5aa993b | 2028 | |
488f131b JB |
2029 | This function's use of the simple variable |
2030 | step_resume_breakpoint doesn't seem to accomodate | |
2031 | simultaneously active step-resume bp's, although the | |
2032 | breakpoint list certainly can. | |
c5aa993b | 2033 | |
488f131b JB |
2034 | If we reach here and step_resume_breakpoint is already |
2035 | NULL, then apparently we have multiple active | |
2036 | step-resume bp's. We'll just delete the breakpoint we | |
2037 | stopped at, and carry on. | |
2038 | ||
2039 | Correction: what the code currently does is delete a | |
2040 | step-resume bp, but it makes no effort to ensure that | |
2041 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2042 | |
488f131b JB |
2043 | if (step_resume_breakpoint == NULL) |
2044 | { | |
2045 | step_resume_breakpoint = | |
2046 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2047 | } | |
2048 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
2049 | break; | |
2050 | ||
2051 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
2052 | if (through_sigtramp_breakpoint) | |
2053 | delete_breakpoint (through_sigtramp_breakpoint); | |
2054 | through_sigtramp_breakpoint = NULL; | |
2055 | ||
2056 | /* If were waiting for a trap, hitting the step_resume_break | |
2057 | doesn't count as getting it. */ | |
2058 | if (trap_expected) | |
2059 | ecs->another_trap = 1; | |
2060 | break; | |
2061 | ||
2062 | case BPSTAT_WHAT_CHECK_SHLIBS: | |
2063 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2064 | #ifdef SOLIB_ADD | |
c906108c | 2065 | { |
488f131b JB |
2066 | /* Remove breakpoints, we eventually want to step over the |
2067 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2068 | breakpoint addresses via breakpoint_re_set. */ | |
2069 | if (breakpoints_inserted) | |
2070 | remove_breakpoints (); | |
c5aa993b | 2071 | breakpoints_inserted = 0; |
488f131b JB |
2072 | |
2073 | /* Check for any newly added shared libraries if we're | |
2074 | supposed to be adding them automatically. Switch | |
2075 | terminal for any messages produced by | |
2076 | breakpoint_re_set. */ | |
2077 | target_terminal_ours_for_output (); | |
2078 | SOLIB_ADD (NULL, 0, NULL, auto_solib_add); | |
2079 | target_terminal_inferior (); | |
2080 | ||
2081 | /* Try to reenable shared library breakpoints, additional | |
2082 | code segments in shared libraries might be mapped in now. */ | |
2083 | re_enable_breakpoints_in_shlibs (); | |
2084 | ||
2085 | /* If requested, stop when the dynamic linker notifies | |
2086 | gdb of events. This allows the user to get control | |
2087 | and place breakpoints in initializer routines for | |
2088 | dynamically loaded objects (among other things). */ | |
2089 | if (stop_on_solib_events) | |
d4f3574e | 2090 | { |
488f131b | 2091 | stop_stepping (ecs); |
d4f3574e SS |
2092 | return; |
2093 | } | |
c5aa993b | 2094 | |
488f131b JB |
2095 | /* If we stopped due to an explicit catchpoint, then the |
2096 | (see above) call to SOLIB_ADD pulled in any symbols | |
2097 | from a newly-loaded library, if appropriate. | |
2098 | ||
2099 | We do want the inferior to stop, but not where it is | |
2100 | now, which is in the dynamic linker callback. Rather, | |
2101 | we would like it stop in the user's program, just after | |
2102 | the call that caused this catchpoint to trigger. That | |
2103 | gives the user a more useful vantage from which to | |
2104 | examine their program's state. */ | |
2105 | else if (what.main_action == | |
2106 | BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
c906108c | 2107 | { |
488f131b JB |
2108 | /* ??rehrauer: If I could figure out how to get the |
2109 | right return PC from here, we could just set a temp | |
2110 | breakpoint and resume. I'm not sure we can without | |
2111 | cracking open the dld's shared libraries and sniffing | |
2112 | their unwind tables and text/data ranges, and that's | |
2113 | not a terribly portable notion. | |
2114 | ||
2115 | Until that time, we must step the inferior out of the | |
2116 | dld callback, and also out of the dld itself (and any | |
2117 | code or stubs in libdld.sl, such as "shl_load" and | |
2118 | friends) until we reach non-dld code. At that point, | |
2119 | we can stop stepping. */ | |
2120 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2121 | &ecs-> | |
2122 | stepping_through_solib_catchpoints); | |
2123 | ecs->stepping_through_solib_after_catch = 1; | |
2124 | ||
2125 | /* Be sure to lift all breakpoints, so the inferior does | |
2126 | actually step past this point... */ | |
2127 | ecs->another_trap = 1; | |
2128 | break; | |
c906108c | 2129 | } |
c5aa993b | 2130 | else |
c5aa993b | 2131 | { |
488f131b | 2132 | /* We want to step over this breakpoint, then keep going. */ |
c5aa993b | 2133 | ecs->another_trap = 1; |
488f131b | 2134 | break; |
c5aa993b | 2135 | } |
488f131b JB |
2136 | } |
2137 | #endif | |
2138 | break; | |
c906108c | 2139 | |
488f131b JB |
2140 | case BPSTAT_WHAT_LAST: |
2141 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2142 | |
488f131b JB |
2143 | case BPSTAT_WHAT_KEEP_CHECKING: |
2144 | break; | |
2145 | } | |
2146 | } | |
c906108c | 2147 | |
488f131b JB |
2148 | /* We come here if we hit a breakpoint but should not |
2149 | stop for it. Possibly we also were stepping | |
2150 | and should stop for that. So fall through and | |
2151 | test for stepping. But, if not stepping, | |
2152 | do not stop. */ | |
c906108c | 2153 | |
488f131b JB |
2154 | /* Are we stepping to get the inferior out of the dynamic |
2155 | linker's hook (and possibly the dld itself) after catching | |
2156 | a shlib event? */ | |
2157 | if (ecs->stepping_through_solib_after_catch) | |
2158 | { | |
2159 | #if defined(SOLIB_ADD) | |
2160 | /* Have we reached our destination? If not, keep going. */ | |
2161 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2162 | { | |
2163 | ecs->another_trap = 1; | |
2164 | keep_going (ecs); | |
104c1213 | 2165 | return; |
488f131b JB |
2166 | } |
2167 | #endif | |
2168 | /* Else, stop and report the catchpoint(s) whose triggering | |
2169 | caused us to begin stepping. */ | |
2170 | ecs->stepping_through_solib_after_catch = 0; | |
2171 | bpstat_clear (&stop_bpstat); | |
2172 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2173 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2174 | stop_print_frame = 1; | |
2175 | stop_stepping (ecs); | |
2176 | return; | |
2177 | } | |
c906108c | 2178 | |
488f131b JB |
2179 | if (!CALL_DUMMY_BREAKPOINT_OFFSET_P) |
2180 | { | |
2181 | /* This is the old way of detecting the end of the stack dummy. | |
2182 | An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets | |
2183 | handled above. As soon as we can test it on all of them, all | |
2184 | architectures should define it. */ | |
2185 | ||
2186 | /* If this is the breakpoint at the end of a stack dummy, | |
2187 | just stop silently, unless the user was doing an si/ni, in which | |
2188 | case she'd better know what she's doing. */ | |
2189 | ||
2190 | if (CALL_DUMMY_HAS_COMPLETED (stop_pc, read_sp (), | |
c193f6ac | 2191 | get_frame_base (get_current_frame ())) |
488f131b JB |
2192 | && !step_range_end) |
2193 | { | |
c5aa993b | 2194 | stop_print_frame = 0; |
488f131b JB |
2195 | stop_stack_dummy = 1; |
2196 | #ifdef HP_OS_BUG | |
2197 | trap_expected_after_continue = 1; | |
2198 | #endif | |
104c1213 JM |
2199 | stop_stepping (ecs); |
2200 | return; | |
488f131b JB |
2201 | } |
2202 | } | |
c906108c | 2203 | |
488f131b JB |
2204 | if (step_resume_breakpoint) |
2205 | { | |
2206 | /* Having a step-resume breakpoint overrides anything | |
2207 | else having to do with stepping commands until | |
2208 | that breakpoint is reached. */ | |
2209 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2210 | whether it could/should be keep_going. */ | |
2211 | check_sigtramp2 (ecs); | |
2212 | keep_going (ecs); | |
2213 | return; | |
2214 | } | |
c5aa993b | 2215 | |
488f131b JB |
2216 | if (step_range_end == 0) |
2217 | { | |
2218 | /* Likewise if we aren't even stepping. */ | |
2219 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2220 | whether it could/should be keep_going. */ | |
2221 | check_sigtramp2 (ecs); | |
2222 | keep_going (ecs); | |
2223 | return; | |
2224 | } | |
c5aa993b | 2225 | |
488f131b | 2226 | /* If stepping through a line, keep going if still within it. |
c906108c | 2227 | |
488f131b JB |
2228 | Note that step_range_end is the address of the first instruction |
2229 | beyond the step range, and NOT the address of the last instruction | |
2230 | within it! */ | |
2231 | if (stop_pc >= step_range_start && stop_pc < step_range_end) | |
2232 | { | |
2233 | /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal. | |
2234 | So definately need to check for sigtramp here. */ | |
2235 | check_sigtramp2 (ecs); | |
2236 | keep_going (ecs); | |
2237 | return; | |
2238 | } | |
c5aa993b | 2239 | |
488f131b | 2240 | /* We stepped out of the stepping range. */ |
c906108c | 2241 | |
488f131b JB |
2242 | /* If we are stepping at the source level and entered the runtime |
2243 | loader dynamic symbol resolution code, we keep on single stepping | |
2244 | until we exit the run time loader code and reach the callee's | |
2245 | address. */ | |
2246 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
2247 | && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) | |
2248 | { | |
2249 | CORE_ADDR pc_after_resolver = SKIP_SOLIB_RESOLVER (stop_pc); | |
c906108c | 2250 | |
488f131b JB |
2251 | if (pc_after_resolver) |
2252 | { | |
2253 | /* Set up a step-resume breakpoint at the address | |
2254 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2255 | struct symtab_and_line sr_sal; | |
fe39c653 | 2256 | init_sal (&sr_sal); |
488f131b JB |
2257 | sr_sal.pc = pc_after_resolver; |
2258 | ||
2259 | check_for_old_step_resume_breakpoint (); | |
2260 | step_resume_breakpoint = | |
818dd999 | 2261 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
488f131b JB |
2262 | if (breakpoints_inserted) |
2263 | insert_breakpoints (); | |
c5aa993b | 2264 | } |
c906108c | 2265 | |
488f131b JB |
2266 | keep_going (ecs); |
2267 | return; | |
2268 | } | |
c906108c | 2269 | |
488f131b JB |
2270 | /* We can't update step_sp every time through the loop, because |
2271 | reading the stack pointer would slow down stepping too much. | |
2272 | But we can update it every time we leave the step range. */ | |
2273 | ecs->update_step_sp = 1; | |
c906108c | 2274 | |
488f131b JB |
2275 | /* Did we just take a signal? */ |
2276 | if (PC_IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
2277 | && !PC_IN_SIGTRAMP (prev_pc, prev_func_name) | |
2278 | && INNER_THAN (read_sp (), step_sp)) | |
2279 | { | |
2280 | /* We've just taken a signal; go until we are back to | |
2281 | the point where we took it and one more. */ | |
c906108c | 2282 | |
488f131b JB |
2283 | /* Note: The test above succeeds not only when we stepped |
2284 | into a signal handler, but also when we step past the last | |
2285 | statement of a signal handler and end up in the return stub | |
2286 | of the signal handler trampoline. To distinguish between | |
2287 | these two cases, check that the frame is INNER_THAN the | |
2288 | previous one below. pai/1997-09-11 */ | |
c5aa993b | 2289 | |
c5aa993b | 2290 | |
c5aa993b | 2291 | { |
aa0cd9c1 | 2292 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
c906108c | 2293 | |
aa0cd9c1 | 2294 | if (frame_id_inner (current_frame, step_frame_id)) |
488f131b JB |
2295 | { |
2296 | /* We have just taken a signal; go until we are back to | |
2297 | the point where we took it and one more. */ | |
c906108c | 2298 | |
488f131b JB |
2299 | /* This code is needed at least in the following case: |
2300 | The user types "next" and then a signal arrives (before | |
2301 | the "next" is done). */ | |
d4f3574e | 2302 | |
488f131b JB |
2303 | /* Note that if we are stopped at a breakpoint, then we need |
2304 | the step_resume breakpoint to override any breakpoints at | |
2305 | the same location, so that we will still step over the | |
2306 | breakpoint even though the signal happened. */ | |
d4f3574e | 2307 | struct symtab_and_line sr_sal; |
d4f3574e | 2308 | |
fe39c653 | 2309 | init_sal (&sr_sal); |
488f131b JB |
2310 | sr_sal.symtab = NULL; |
2311 | sr_sal.line = 0; | |
2312 | sr_sal.pc = prev_pc; | |
2313 | /* We could probably be setting the frame to | |
aa0cd9c1 | 2314 | step_frame_id; I don't think anyone thought to try it. */ |
d4f3574e SS |
2315 | check_for_old_step_resume_breakpoint (); |
2316 | step_resume_breakpoint = | |
818dd999 | 2317 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
d4f3574e SS |
2318 | if (breakpoints_inserted) |
2319 | insert_breakpoints (); | |
2320 | } | |
488f131b JB |
2321 | else |
2322 | { | |
2323 | /* We just stepped out of a signal handler and into | |
2324 | its calling trampoline. | |
2325 | ||
2326 | Normally, we'd call step_over_function from | |
2327 | here, but for some reason GDB can't unwind the | |
2328 | stack correctly to find the real PC for the point | |
2329 | user code where the signal trampoline will return | |
2330 | -- FRAME_SAVED_PC fails, at least on HP-UX 10.20. | |
2331 | But signal trampolines are pretty small stubs of | |
2332 | code, anyway, so it's OK instead to just | |
2333 | single-step out. Note: assuming such trampolines | |
2334 | don't exhibit recursion on any platform... */ | |
2335 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
2336 | &ecs->stop_func_start, | |
2337 | &ecs->stop_func_end); | |
2338 | /* Readjust stepping range */ | |
2339 | step_range_start = ecs->stop_func_start; | |
2340 | step_range_end = ecs->stop_func_end; | |
2341 | ecs->stepping_through_sigtramp = 1; | |
2342 | } | |
d4f3574e | 2343 | } |
c906108c | 2344 | |
c906108c | 2345 | |
488f131b JB |
2346 | /* If this is stepi or nexti, make sure that the stepping range |
2347 | gets us past that instruction. */ | |
2348 | if (step_range_end == 1) | |
2349 | /* FIXME: Does this run afoul of the code below which, if | |
2350 | we step into the middle of a line, resets the stepping | |
2351 | range? */ | |
2352 | step_range_end = (step_range_start = prev_pc) + 1; | |
2353 | ||
2354 | ecs->remove_breakpoints_on_following_step = 1; | |
2355 | keep_going (ecs); | |
2356 | return; | |
2357 | } | |
c906108c | 2358 | |
488f131b JB |
2359 | if (stop_pc == ecs->stop_func_start /* Quick test */ |
2360 | || (in_prologue (stop_pc, ecs->stop_func_start) && | |
2361 | !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2362 | || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name) | |
2363 | || ecs->stop_func_name == 0) | |
2364 | { | |
2365 | /* It's a subroutine call. */ | |
c906108c | 2366 | |
488f131b JB |
2367 | if ((step_over_calls == STEP_OVER_NONE) |
2368 | || ((step_range_end == 1) | |
2369 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
2370 | { | |
2371 | /* I presume that step_over_calls is only 0 when we're | |
2372 | supposed to be stepping at the assembly language level | |
2373 | ("stepi"). Just stop. */ | |
2374 | /* Also, maybe we just did a "nexti" inside a prolog, | |
2375 | so we thought it was a subroutine call but it was not. | |
2376 | Stop as well. FENN */ | |
2377 | stop_step = 1; | |
2378 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2379 | stop_stepping (ecs); | |
2380 | return; | |
2381 | } | |
c906108c | 2382 | |
488f131b | 2383 | if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc)) |
c5aa993b | 2384 | { |
488f131b JB |
2385 | /* We're doing a "next". */ |
2386 | ||
2387 | if (PC_IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
aa0cd9c1 AC |
2388 | && frame_id_inner (step_frame_id, |
2389 | frame_id_build (read_sp (), 0))) | |
488f131b JB |
2390 | /* We stepped out of a signal handler, and into its |
2391 | calling trampoline. This is misdetected as a | |
2392 | subroutine call, but stepping over the signal | |
aa0cd9c1 AC |
2393 | trampoline isn't such a bad idea. In order to do that, |
2394 | we have to ignore the value in step_frame_id, since | |
2395 | that doesn't represent the frame that'll reach when we | |
2396 | return from the signal trampoline. Otherwise we'll | |
2397 | probably continue to the end of the program. */ | |
2398 | step_frame_id = null_frame_id; | |
488f131b JB |
2399 | |
2400 | step_over_function (ecs); | |
2401 | keep_going (ecs); | |
2402 | return; | |
2403 | } | |
c906108c | 2404 | |
488f131b JB |
2405 | /* If we are in a function call trampoline (a stub between |
2406 | the calling routine and the real function), locate the real | |
2407 | function. That's what tells us (a) whether we want to step | |
2408 | into it at all, and (b) what prologue we want to run to | |
2409 | the end of, if we do step into it. */ | |
2410 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2411 | if (tmp != 0) | |
2412 | ecs->stop_func_start = tmp; | |
2413 | else | |
2414 | { | |
2415 | tmp = DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc); | |
2416 | if (tmp) | |
c5aa993b | 2417 | { |
488f131b JB |
2418 | struct symtab_and_line xxx; |
2419 | /* Why isn't this s_a_l called "sr_sal", like all of the | |
2420 | other s_a_l's where this code is duplicated? */ | |
fe39c653 | 2421 | init_sal (&xxx); /* initialize to zeroes */ |
488f131b JB |
2422 | xxx.pc = tmp; |
2423 | xxx.section = find_pc_overlay (xxx.pc); | |
a0b3c4fd | 2424 | check_for_old_step_resume_breakpoint (); |
c5aa993b | 2425 | step_resume_breakpoint = |
818dd999 | 2426 | set_momentary_breakpoint (xxx, null_frame_id, bp_step_resume); |
488f131b JB |
2427 | insert_breakpoints (); |
2428 | keep_going (ecs); | |
2429 | return; | |
c906108c | 2430 | } |
c906108c SS |
2431 | } |
2432 | ||
488f131b JB |
2433 | /* If we have line number information for the function we |
2434 | are thinking of stepping into, step into it. | |
c906108c | 2435 | |
488f131b JB |
2436 | If there are several symtabs at that PC (e.g. with include |
2437 | files), just want to know whether *any* of them have line | |
2438 | numbers. find_pc_line handles this. */ | |
c5aa993b | 2439 | { |
488f131b | 2440 | struct symtab_and_line tmp_sal; |
c906108c | 2441 | |
488f131b JB |
2442 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2443 | if (tmp_sal.line != 0) | |
d4f3574e | 2444 | { |
488f131b | 2445 | step_into_function (ecs); |
d4f3574e SS |
2446 | return; |
2447 | } | |
488f131b | 2448 | } |
c5aa993b | 2449 | |
488f131b JB |
2450 | /* If we have no line number and the step-stop-if-no-debug |
2451 | is set, we stop the step so that the user has a chance to | |
2452 | switch in assembly mode. */ | |
2453 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) | |
c5aa993b | 2454 | { |
488f131b JB |
2455 | stop_step = 1; |
2456 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2457 | stop_stepping (ecs); | |
2458 | return; | |
c906108c | 2459 | } |
5fbbeb29 | 2460 | |
488f131b JB |
2461 | step_over_function (ecs); |
2462 | keep_going (ecs); | |
2463 | return; | |
c906108c | 2464 | |
488f131b | 2465 | } |
c906108c | 2466 | |
488f131b | 2467 | /* We've wandered out of the step range. */ |
c906108c | 2468 | |
488f131b | 2469 | ecs->sal = find_pc_line (stop_pc, 0); |
c906108c | 2470 | |
488f131b JB |
2471 | if (step_range_end == 1) |
2472 | { | |
2473 | /* It is stepi or nexti. We always want to stop stepping after | |
2474 | one instruction. */ | |
2475 | stop_step = 1; | |
2476 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2477 | stop_stepping (ecs); | |
2478 | return; | |
2479 | } | |
c906108c | 2480 | |
488f131b JB |
2481 | /* If we're in the return path from a shared library trampoline, |
2482 | we want to proceed through the trampoline when stepping. */ | |
2483 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2484 | { | |
2485 | CORE_ADDR tmp; | |
c906108c | 2486 | |
488f131b JB |
2487 | /* Determine where this trampoline returns. */ |
2488 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
c906108c | 2489 | |
488f131b JB |
2490 | /* Only proceed through if we know where it's going. */ |
2491 | if (tmp) | |
2492 | { | |
2493 | /* And put the step-breakpoint there and go until there. */ | |
2494 | struct symtab_and_line sr_sal; | |
2495 | ||
fe39c653 | 2496 | init_sal (&sr_sal); /* initialize to zeroes */ |
488f131b JB |
2497 | sr_sal.pc = tmp; |
2498 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2499 | /* Do not specify what the fp should be when we stop | |
2500 | since on some machines the prologue | |
2501 | is where the new fp value is established. */ | |
2502 | check_for_old_step_resume_breakpoint (); | |
2503 | step_resume_breakpoint = | |
818dd999 | 2504 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
488f131b JB |
2505 | if (breakpoints_inserted) |
2506 | insert_breakpoints (); | |
c906108c | 2507 | |
488f131b JB |
2508 | /* Restart without fiddling with the step ranges or |
2509 | other state. */ | |
2510 | keep_going (ecs); | |
2511 | return; | |
2512 | } | |
2513 | } | |
c906108c | 2514 | |
488f131b JB |
2515 | if (ecs->sal.line == 0) |
2516 | { | |
2517 | /* We have no line number information. That means to stop | |
2518 | stepping (does this always happen right after one instruction, | |
2519 | when we do "s" in a function with no line numbers, | |
2520 | or can this happen as a result of a return or longjmp?). */ | |
2521 | stop_step = 1; | |
2522 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2523 | stop_stepping (ecs); | |
2524 | return; | |
2525 | } | |
c906108c | 2526 | |
488f131b JB |
2527 | if ((stop_pc == ecs->sal.pc) |
2528 | && (ecs->current_line != ecs->sal.line | |
2529 | || ecs->current_symtab != ecs->sal.symtab)) | |
2530 | { | |
2531 | /* We are at the start of a different line. So stop. Note that | |
2532 | we don't stop if we step into the middle of a different line. | |
2533 | That is said to make things like for (;;) statements work | |
2534 | better. */ | |
2535 | stop_step = 1; | |
2536 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2537 | stop_stepping (ecs); | |
2538 | return; | |
2539 | } | |
c906108c | 2540 | |
488f131b | 2541 | /* We aren't done stepping. |
c906108c | 2542 | |
488f131b JB |
2543 | Optimize by setting the stepping range to the line. |
2544 | (We might not be in the original line, but if we entered a | |
2545 | new line in mid-statement, we continue stepping. This makes | |
2546 | things like for(;;) statements work better.) */ | |
c906108c | 2547 | |
488f131b | 2548 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
c5aa993b | 2549 | { |
488f131b JB |
2550 | /* If this is the last line of the function, don't keep stepping |
2551 | (it would probably step us out of the function). | |
2552 | This is particularly necessary for a one-line function, | |
2553 | in which after skipping the prologue we better stop even though | |
2554 | we will be in mid-line. */ | |
2555 | stop_step = 1; | |
2556 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2557 | stop_stepping (ecs); | |
2558 | return; | |
c5aa993b | 2559 | } |
488f131b JB |
2560 | step_range_start = ecs->sal.pc; |
2561 | step_range_end = ecs->sal.end; | |
aa0cd9c1 | 2562 | step_frame_id = get_frame_id (get_current_frame ()); |
488f131b JB |
2563 | ecs->current_line = ecs->sal.line; |
2564 | ecs->current_symtab = ecs->sal.symtab; | |
2565 | ||
aa0cd9c1 AC |
2566 | /* In the case where we just stepped out of a function into the |
2567 | middle of a line of the caller, continue stepping, but | |
2568 | step_frame_id must be modified to current frame */ | |
488f131b | 2569 | { |
aa0cd9c1 AC |
2570 | struct frame_id current_frame = get_frame_id (get_current_frame ()); |
2571 | if (!(frame_id_inner (current_frame, step_frame_id))) | |
2572 | step_frame_id = current_frame; | |
488f131b | 2573 | } |
c906108c | 2574 | |
488f131b | 2575 | keep_going (ecs); |
104c1213 JM |
2576 | } |
2577 | ||
2578 | /* Are we in the middle of stepping? */ | |
2579 | ||
2580 | static int | |
2581 | currently_stepping (struct execution_control_state *ecs) | |
2582 | { | |
2583 | return ((through_sigtramp_breakpoint == NULL | |
2584 | && !ecs->handling_longjmp | |
2585 | && ((step_range_end && step_resume_breakpoint == NULL) | |
2586 | || trap_expected)) | |
2587 | || ecs->stepping_through_solib_after_catch | |
2588 | || bpstat_should_step ()); | |
2589 | } | |
c906108c | 2590 | |
104c1213 JM |
2591 | static void |
2592 | check_sigtramp2 (struct execution_control_state *ecs) | |
2593 | { | |
2594 | if (trap_expected | |
d7bd68ca AC |
2595 | && PC_IN_SIGTRAMP (stop_pc, ecs->stop_func_name) |
2596 | && !PC_IN_SIGTRAMP (prev_pc, prev_func_name) | |
104c1213 JM |
2597 | && INNER_THAN (read_sp (), step_sp)) |
2598 | { | |
2599 | /* What has happened here is that we have just stepped the | |
488f131b JB |
2600 | inferior with a signal (because it is a signal which |
2601 | shouldn't make us stop), thus stepping into sigtramp. | |
104c1213 | 2602 | |
488f131b JB |
2603 | So we need to set a step_resume_break_address breakpoint and |
2604 | continue until we hit it, and then step. FIXME: This should | |
2605 | be more enduring than a step_resume breakpoint; we should | |
2606 | know that we will later need to keep going rather than | |
2607 | re-hitting the breakpoint here (see the testsuite, | |
2608 | gdb.base/signals.exp where it says "exceedingly difficult"). */ | |
104c1213 JM |
2609 | |
2610 | struct symtab_and_line sr_sal; | |
2611 | ||
fe39c653 | 2612 | init_sal (&sr_sal); /* initialize to zeroes */ |
104c1213 JM |
2613 | sr_sal.pc = prev_pc; |
2614 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2615 | /* We perhaps could set the frame if we kept track of what the | |
488f131b | 2616 | frame corresponding to prev_pc was. But we don't, so don't. */ |
104c1213 | 2617 | through_sigtramp_breakpoint = |
818dd999 | 2618 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_through_sigtramp); |
104c1213 JM |
2619 | if (breakpoints_inserted) |
2620 | insert_breakpoints (); | |
cd0fc7c3 | 2621 | |
104c1213 JM |
2622 | ecs->remove_breakpoints_on_following_step = 1; |
2623 | ecs->another_trap = 1; | |
2624 | } | |
2625 | } | |
2626 | ||
c2c6d25f JM |
2627 | /* Subroutine call with source code we should not step over. Do step |
2628 | to the first line of code in it. */ | |
2629 | ||
2630 | static void | |
2631 | step_into_function (struct execution_control_state *ecs) | |
2632 | { | |
2633 | struct symtab *s; | |
2634 | struct symtab_and_line sr_sal; | |
2635 | ||
2636 | s = find_pc_symtab (stop_pc); | |
2637 | if (s && s->language != language_asm) | |
2638 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
2639 | ||
2640 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2641 | /* Use the step_resume_break to step until the end of the prologue, | |
2642 | even if that involves jumps (as it seems to on the vax under | |
2643 | 4.2). */ | |
2644 | /* If the prologue ends in the middle of a source line, continue to | |
2645 | the end of that source line (if it is still within the function). | |
2646 | Otherwise, just go to end of prologue. */ | |
2647 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP | |
2648 | /* no, don't either. It skips any code that's legitimately on the | |
2649 | first line. */ | |
2650 | #else | |
2651 | if (ecs->sal.end | |
2652 | && ecs->sal.pc != ecs->stop_func_start | |
2653 | && ecs->sal.end < ecs->stop_func_end) | |
2654 | ecs->stop_func_start = ecs->sal.end; | |
2655 | #endif | |
2656 | ||
2657 | if (ecs->stop_func_start == stop_pc) | |
2658 | { | |
2659 | /* We are already there: stop now. */ | |
2660 | stop_step = 1; | |
488f131b | 2661 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2662 | stop_stepping (ecs); |
2663 | return; | |
2664 | } | |
2665 | else | |
2666 | { | |
2667 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 2668 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
2669 | sr_sal.pc = ecs->stop_func_start; |
2670 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
2671 | /* Do not specify what the fp should be when we stop since on | |
488f131b JB |
2672 | some machines the prologue is where the new fp value is |
2673 | established. */ | |
c2c6d25f JM |
2674 | check_for_old_step_resume_breakpoint (); |
2675 | step_resume_breakpoint = | |
818dd999 | 2676 | set_momentary_breakpoint (sr_sal, null_frame_id, bp_step_resume); |
c2c6d25f JM |
2677 | if (breakpoints_inserted) |
2678 | insert_breakpoints (); | |
2679 | ||
2680 | /* And make sure stepping stops right away then. */ | |
2681 | step_range_end = step_range_start; | |
2682 | } | |
2683 | keep_going (ecs); | |
2684 | } | |
d4f3574e SS |
2685 | |
2686 | /* We've just entered a callee, and we wish to resume until it returns | |
2687 | to the caller. Setting a step_resume breakpoint on the return | |
2688 | address will catch a return from the callee. | |
2689 | ||
2690 | However, if the callee is recursing, we want to be careful not to | |
2691 | catch returns of those recursive calls, but only of THIS instance | |
2692 | of the call. | |
2693 | ||
2694 | To do this, we set the step_resume bp's frame to our current | |
aa0cd9c1 | 2695 | caller's frame (step_frame_id, which is set by the "next" or |
d4f3574e SS |
2696 | "until" command, before execution begins). */ |
2697 | ||
2698 | static void | |
2699 | step_over_function (struct execution_control_state *ecs) | |
2700 | { | |
2701 | struct symtab_and_line sr_sal; | |
2702 | ||
fe39c653 | 2703 | init_sal (&sr_sal); /* initialize to zeros */ |
d4f3574e SS |
2704 | sr_sal.pc = ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ())); |
2705 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2706 | ||
2707 | check_for_old_step_resume_breakpoint (); | |
2708 | step_resume_breakpoint = | |
818dd999 AC |
2709 | set_momentary_breakpoint (sr_sal, get_frame_id (get_current_frame ()), |
2710 | bp_step_resume); | |
d4f3574e | 2711 | |
aa0cd9c1 AC |
2712 | if (frame_id_p (step_frame_id) |
2713 | && !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc)) | |
818dd999 | 2714 | step_resume_breakpoint->frame_id = step_frame_id; |
d4f3574e SS |
2715 | |
2716 | if (breakpoints_inserted) | |
2717 | insert_breakpoints (); | |
2718 | } | |
2719 | ||
104c1213 JM |
2720 | static void |
2721 | stop_stepping (struct execution_control_state *ecs) | |
2722 | { | |
c906108c SS |
2723 | if (target_has_execution) |
2724 | { | |
c906108c | 2725 | /* Assuming the inferior still exists, set these up for next |
c5aa993b JM |
2726 | time, just like we did above if we didn't break out of the |
2727 | loop. */ | |
c906108c | 2728 | prev_pc = read_pc (); |
cd0fc7c3 SS |
2729 | prev_func_start = ecs->stop_func_start; |
2730 | prev_func_name = ecs->stop_func_name; | |
c906108c | 2731 | } |
104c1213 | 2732 | |
cd0fc7c3 SS |
2733 | /* Let callers know we don't want to wait for the inferior anymore. */ |
2734 | ecs->wait_some_more = 0; | |
2735 | } | |
2736 | ||
d4f3574e SS |
2737 | /* This function handles various cases where we need to continue |
2738 | waiting for the inferior. */ | |
2739 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
2740 | ||
2741 | static void | |
2742 | keep_going (struct execution_control_state *ecs) | |
2743 | { | |
d4f3574e | 2744 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 2745 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e SS |
2746 | prev_func_start = ecs->stop_func_start; /* Ok, since if DECR_PC_AFTER |
2747 | BREAK is defined, the | |
2748 | original pc would not have | |
2749 | been at the start of a | |
2750 | function. */ | |
2751 | prev_func_name = ecs->stop_func_name; | |
2752 | ||
2753 | if (ecs->update_step_sp) | |
2754 | step_sp = read_sp (); | |
2755 | ecs->update_step_sp = 0; | |
2756 | ||
2757 | /* If we did not do break;, it means we should keep running the | |
2758 | inferior and not return to debugger. */ | |
2759 | ||
2760 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
2761 | { | |
2762 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
2763 | the inferior, else we'd have done a break above) and we |
2764 | haven't yet gotten our trap. Simply continue. */ | |
d4f3574e SS |
2765 | resume (currently_stepping (ecs), stop_signal); |
2766 | } | |
2767 | else | |
2768 | { | |
2769 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
2770 | anyway (the user asked that this signal be passed to the |
2771 | child) | |
2772 | -- or -- | |
2773 | The signal was SIGTRAP, e.g. it was our signal, but we | |
2774 | decided we should resume from it. | |
d4f3574e | 2775 | |
488f131b | 2776 | We're going to run this baby now! |
d4f3574e | 2777 | |
488f131b JB |
2778 | Insert breakpoints now, unless we are trying to one-proceed |
2779 | past a breakpoint. */ | |
d4f3574e | 2780 | /* If we've just finished a special step resume and we don't |
488f131b | 2781 | want to hit a breakpoint, pull em out. */ |
d4f3574e SS |
2782 | if (step_resume_breakpoint == NULL |
2783 | && through_sigtramp_breakpoint == NULL | |
2784 | && ecs->remove_breakpoints_on_following_step) | |
2785 | { | |
2786 | ecs->remove_breakpoints_on_following_step = 0; | |
2787 | remove_breakpoints (); | |
2788 | breakpoints_inserted = 0; | |
2789 | } | |
2790 | else if (!breakpoints_inserted && | |
2791 | (through_sigtramp_breakpoint != NULL || !ecs->another_trap)) | |
2792 | { | |
2793 | breakpoints_failed = insert_breakpoints (); | |
2794 | if (breakpoints_failed) | |
2795 | { | |
2796 | stop_stepping (ecs); | |
2797 | return; | |
2798 | } | |
2799 | breakpoints_inserted = 1; | |
2800 | } | |
2801 | ||
2802 | trap_expected = ecs->another_trap; | |
2803 | ||
2804 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
2805 | specifies that such a signal should be delivered to the |
2806 | target program). | |
2807 | ||
2808 | Typically, this would occure when a user is debugging a | |
2809 | target monitor on a simulator: the target monitor sets a | |
2810 | breakpoint; the simulator encounters this break-point and | |
2811 | halts the simulation handing control to GDB; GDB, noteing | |
2812 | that the break-point isn't valid, returns control back to the | |
2813 | simulator; the simulator then delivers the hardware | |
2814 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
2815 | ||
2816 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
2817 | stop_signal = TARGET_SIGNAL_0; |
2818 | ||
2819 | #ifdef SHIFT_INST_REGS | |
2820 | /* I'm not sure when this following segment applies. I do know, | |
488f131b JB |
2821 | now, that we shouldn't rewrite the regs when we were stopped |
2822 | by a random signal from the inferior process. */ | |
d4f3574e | 2823 | /* FIXME: Shouldn't this be based on the valid bit of the SXIP? |
488f131b | 2824 | (this is only used on the 88k). */ |
d4f3574e SS |
2825 | |
2826 | if (!bpstat_explains_signal (stop_bpstat) | |
488f131b | 2827 | && (stop_signal != TARGET_SIGNAL_CHLD) && !stopped_by_random_signal) |
d4f3574e SS |
2828 | SHIFT_INST_REGS (); |
2829 | #endif /* SHIFT_INST_REGS */ | |
2830 | ||
2831 | resume (currently_stepping (ecs), stop_signal); | |
2832 | } | |
2833 | ||
488f131b | 2834 | prepare_to_wait (ecs); |
d4f3574e SS |
2835 | } |
2836 | ||
104c1213 JM |
2837 | /* This function normally comes after a resume, before |
2838 | handle_inferior_event exits. It takes care of any last bits of | |
2839 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 2840 | |
104c1213 JM |
2841 | static void |
2842 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 2843 | { |
104c1213 JM |
2844 | if (ecs->infwait_state == infwait_normal_state) |
2845 | { | |
2846 | overlay_cache_invalid = 1; | |
2847 | ||
2848 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
2849 | target_wait because they can be loaded from the target while |
2850 | in target_wait. This makes remote debugging a bit more | |
2851 | efficient for those targets that provide critical registers | |
2852 | as part of their normal status mechanism. */ | |
104c1213 JM |
2853 | |
2854 | registers_changed (); | |
39f77062 | 2855 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
2856 | ecs->wp = &(ecs->ws); |
2857 | } | |
2858 | /* This is the old end of the while loop. Let everybody know we | |
2859 | want to wait for the inferior some more and get called again | |
2860 | soon. */ | |
2861 | ecs->wait_some_more = 1; | |
c906108c | 2862 | } |
11cf8741 JM |
2863 | |
2864 | /* Print why the inferior has stopped. We always print something when | |
2865 | the inferior exits, or receives a signal. The rest of the cases are | |
2866 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
2867 | there should be a call to this function from handle_inferior_event() | |
2868 | each time stop_stepping() is called.*/ | |
2869 | static void | |
2870 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
2871 | { | |
2872 | switch (stop_reason) | |
2873 | { | |
2874 | case STOP_UNKNOWN: | |
2875 | /* We don't deal with these cases from handle_inferior_event() | |
2876 | yet. */ | |
2877 | break; | |
2878 | case END_STEPPING_RANGE: | |
2879 | /* We are done with a step/next/si/ni command. */ | |
2880 | /* For now print nothing. */ | |
fb40c209 | 2881 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 2882 | operation for n > 1 */ |
fb40c209 | 2883 | if (!step_multi || !stop_step) |
9dc5e2a9 | 2884 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2885 | ui_out_field_string (uiout, "reason", "end-stepping-range"); |
11cf8741 JM |
2886 | break; |
2887 | case BREAKPOINT_HIT: | |
2888 | /* We found a breakpoint. */ | |
2889 | /* For now print nothing. */ | |
2890 | break; | |
2891 | case SIGNAL_EXITED: | |
2892 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 2893 | annotate_signalled (); |
9dc5e2a9 | 2894 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2895 | ui_out_field_string (uiout, "reason", "exited-signalled"); |
8b93c638 JM |
2896 | ui_out_text (uiout, "\nProgram terminated with signal "); |
2897 | annotate_signal_name (); | |
488f131b JB |
2898 | ui_out_field_string (uiout, "signal-name", |
2899 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2900 | annotate_signal_name_end (); |
2901 | ui_out_text (uiout, ", "); | |
2902 | annotate_signal_string (); | |
488f131b JB |
2903 | ui_out_field_string (uiout, "signal-meaning", |
2904 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2905 | annotate_signal_string_end (); |
2906 | ui_out_text (uiout, ".\n"); | |
2907 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
2908 | break; |
2909 | case EXITED: | |
2910 | /* The inferior program is finished. */ | |
8b93c638 JM |
2911 | annotate_exited (stop_info); |
2912 | if (stop_info) | |
2913 | { | |
9dc5e2a9 | 2914 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2915 | ui_out_field_string (uiout, "reason", "exited"); |
8b93c638 | 2916 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
2917 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
2918 | (unsigned int) stop_info); | |
8b93c638 JM |
2919 | ui_out_text (uiout, ".\n"); |
2920 | } | |
2921 | else | |
2922 | { | |
9dc5e2a9 | 2923 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 2924 | ui_out_field_string (uiout, "reason", "exited-normally"); |
8b93c638 JM |
2925 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
2926 | } | |
11cf8741 JM |
2927 | break; |
2928 | case SIGNAL_RECEIVED: | |
2929 | /* Signal received. The signal table tells us to print about | |
2930 | it. */ | |
8b93c638 JM |
2931 | annotate_signal (); |
2932 | ui_out_text (uiout, "\nProgram received signal "); | |
2933 | annotate_signal_name (); | |
84c6c83c KS |
2934 | if (ui_out_is_mi_like_p (uiout)) |
2935 | ui_out_field_string (uiout, "reason", "signal-received"); | |
488f131b JB |
2936 | ui_out_field_string (uiout, "signal-name", |
2937 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
2938 | annotate_signal_name_end (); |
2939 | ui_out_text (uiout, ", "); | |
2940 | annotate_signal_string (); | |
488f131b JB |
2941 | ui_out_field_string (uiout, "signal-meaning", |
2942 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
2943 | annotate_signal_string_end (); |
2944 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
2945 | break; |
2946 | default: | |
8e65ff28 AC |
2947 | internal_error (__FILE__, __LINE__, |
2948 | "print_stop_reason: unrecognized enum value"); | |
11cf8741 JM |
2949 | break; |
2950 | } | |
2951 | } | |
c906108c | 2952 | \f |
43ff13b4 | 2953 | |
c906108c SS |
2954 | /* Here to return control to GDB when the inferior stops for real. |
2955 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
2956 | ||
2957 | STOP_PRINT_FRAME nonzero means print the executing frame | |
2958 | (pc, function, args, file, line number and line text). | |
2959 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
2960 | attempting to insert breakpoints. */ | |
2961 | ||
2962 | void | |
96baa820 | 2963 | normal_stop (void) |
c906108c | 2964 | { |
c906108c SS |
2965 | /* As with the notification of thread events, we want to delay |
2966 | notifying the user that we've switched thread context until | |
2967 | the inferior actually stops. | |
2968 | ||
2969 | (Note that there's no point in saying anything if the inferior | |
2970 | has exited!) */ | |
488f131b | 2971 | if (!ptid_equal (previous_inferior_ptid, inferior_ptid) |
7a292a7a | 2972 | && target_has_execution) |
c906108c SS |
2973 | { |
2974 | target_terminal_ours_for_output (); | |
c3f6f71d | 2975 | printf_filtered ("[Switching to %s]\n", |
39f77062 KB |
2976 | target_pid_or_tid_to_str (inferior_ptid)); |
2977 | previous_inferior_ptid = inferior_ptid; | |
c906108c | 2978 | } |
c906108c SS |
2979 | |
2980 | /* Make sure that the current_frame's pc is correct. This | |
2981 | is a correction for setting up the frame info before doing | |
2982 | DECR_PC_AFTER_BREAK */ | |
b87efeee AC |
2983 | if (target_has_execution) |
2984 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to | |
2985 | DECR_PC_AFTER_BREAK, the program counter can change. Ask the | |
2986 | frame code to check for this and sort out any resultant mess. | |
2987 | DECR_PC_AFTER_BREAK needs to just go away. */ | |
2f107107 | 2988 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
c906108c | 2989 | |
c906108c SS |
2990 | if (target_has_execution && breakpoints_inserted) |
2991 | { | |
2992 | if (remove_breakpoints ()) | |
2993 | { | |
2994 | target_terminal_ours_for_output (); | |
2995 | printf_filtered ("Cannot remove breakpoints because "); | |
2996 | printf_filtered ("program is no longer writable.\n"); | |
2997 | printf_filtered ("It might be running in another process.\n"); | |
2998 | printf_filtered ("Further execution is probably impossible.\n"); | |
2999 | } | |
3000 | } | |
3001 | breakpoints_inserted = 0; | |
3002 | ||
3003 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3004 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3005 | ||
3006 | breakpoint_auto_delete (stop_bpstat); | |
3007 | ||
3008 | /* If an auto-display called a function and that got a signal, | |
3009 | delete that auto-display to avoid an infinite recursion. */ | |
3010 | ||
3011 | if (stopped_by_random_signal) | |
3012 | disable_current_display (); | |
3013 | ||
3014 | /* Don't print a message if in the middle of doing a "step n" | |
3015 | operation for n > 1 */ | |
3016 | if (step_multi && stop_step) | |
3017 | goto done; | |
3018 | ||
3019 | target_terminal_ours (); | |
3020 | ||
5913bcb0 AC |
3021 | /* Look up the hook_stop and run it (CLI internally handles problem |
3022 | of stop_command's pre-hook not existing). */ | |
3023 | if (stop_command) | |
3024 | catch_errors (hook_stop_stub, stop_command, | |
3025 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
3026 | |
3027 | if (!target_has_stack) | |
3028 | { | |
3029 | ||
3030 | goto done; | |
3031 | } | |
3032 | ||
3033 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3034 | and current location is based on that. | |
3035 | Don't do this on return from a stack dummy routine, | |
3036 | or if the program has exited. */ | |
3037 | ||
3038 | if (!stop_stack_dummy) | |
3039 | { | |
0f7d239c | 3040 | select_frame (get_current_frame ()); |
c906108c SS |
3041 | |
3042 | /* Print current location without a level number, if | |
c5aa993b JM |
3043 | we have changed functions or hit a breakpoint. |
3044 | Print source line if we have one. | |
3045 | bpstat_print() contains the logic deciding in detail | |
3046 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3047 | |
6e7f8b9c | 3048 | if (stop_print_frame && deprecated_selected_frame) |
c906108c SS |
3049 | { |
3050 | int bpstat_ret; | |
3051 | int source_flag; | |
917317f4 | 3052 | int do_frame_printing = 1; |
c906108c SS |
3053 | |
3054 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3055 | switch (bpstat_ret) |
3056 | { | |
3057 | case PRINT_UNKNOWN: | |
aa0cd9c1 AC |
3058 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
3059 | (or should) carry around the function and does (or | |
3060 | should) use that when doing a frame comparison. */ | |
917317f4 | 3061 | if (stop_step |
aa0cd9c1 AC |
3062 | && frame_id_eq (step_frame_id, |
3063 | get_frame_id (get_current_frame ())) | |
917317f4 | 3064 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3065 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3066 | else |
488f131b | 3067 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3068 | break; |
3069 | case PRINT_SRC_AND_LOC: | |
488f131b | 3070 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3071 | break; |
3072 | case PRINT_SRC_ONLY: | |
c5394b80 | 3073 | source_flag = SRC_LINE; |
917317f4 JM |
3074 | break; |
3075 | case PRINT_NOTHING: | |
488f131b | 3076 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3077 | do_frame_printing = 0; |
3078 | break; | |
3079 | default: | |
488f131b | 3080 | internal_error (__FILE__, __LINE__, "Unknown value."); |
917317f4 | 3081 | } |
fb40c209 | 3082 | /* For mi, have the same behavior every time we stop: |
488f131b | 3083 | print everything but the source line. */ |
9dc5e2a9 | 3084 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3085 | source_flag = LOC_AND_ADDRESS; |
c906108c | 3086 | |
9dc5e2a9 | 3087 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 | 3088 | ui_out_field_int (uiout, "thread-id", |
488f131b | 3089 | pid_to_thread_id (inferior_ptid)); |
c906108c SS |
3090 | /* The behavior of this routine with respect to the source |
3091 | flag is: | |
c5394b80 JM |
3092 | SRC_LINE: Print only source line |
3093 | LOCATION: Print only location | |
3094 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3095 | if (do_frame_printing) |
7789c6f5 | 3096 | print_stack_frame (deprecated_selected_frame, -1, source_flag); |
c906108c SS |
3097 | |
3098 | /* Display the auto-display expressions. */ | |
3099 | do_displays (); | |
3100 | } | |
3101 | } | |
3102 | ||
3103 | /* Save the function value return registers, if we care. | |
3104 | We might be about to restore their previous contents. */ | |
3105 | if (proceed_to_finish) | |
72cec141 AC |
3106 | /* NB: The copy goes through to the target picking up the value of |
3107 | all the registers. */ | |
3108 | regcache_cpy (stop_registers, current_regcache); | |
c906108c SS |
3109 | |
3110 | if (stop_stack_dummy) | |
3111 | { | |
3112 | /* Pop the empty frame that contains the stack dummy. | |
3113 | POP_FRAME ends with a setting of the current frame, so we | |
c5aa993b | 3114 | can use that next. */ |
c906108c SS |
3115 | POP_FRAME; |
3116 | /* Set stop_pc to what it was before we called the function. | |
c5aa993b JM |
3117 | Can't rely on restore_inferior_status because that only gets |
3118 | called if we don't stop in the called function. */ | |
c906108c | 3119 | stop_pc = read_pc (); |
0f7d239c | 3120 | select_frame (get_current_frame ()); |
c906108c SS |
3121 | } |
3122 | ||
c906108c SS |
3123 | done: |
3124 | annotate_stopped (); | |
3125 | } | |
3126 | ||
3127 | static int | |
96baa820 | 3128 | hook_stop_stub (void *cmd) |
c906108c | 3129 | { |
5913bcb0 | 3130 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3131 | return (0); |
3132 | } | |
3133 | \f | |
c5aa993b | 3134 | int |
96baa820 | 3135 | signal_stop_state (int signo) |
c906108c SS |
3136 | { |
3137 | return signal_stop[signo]; | |
3138 | } | |
3139 | ||
c5aa993b | 3140 | int |
96baa820 | 3141 | signal_print_state (int signo) |
c906108c SS |
3142 | { |
3143 | return signal_print[signo]; | |
3144 | } | |
3145 | ||
c5aa993b | 3146 | int |
96baa820 | 3147 | signal_pass_state (int signo) |
c906108c SS |
3148 | { |
3149 | return signal_program[signo]; | |
3150 | } | |
3151 | ||
488f131b | 3152 | int |
7bda5e4a | 3153 | signal_stop_update (int signo, int state) |
d4f3574e SS |
3154 | { |
3155 | int ret = signal_stop[signo]; | |
3156 | signal_stop[signo] = state; | |
3157 | return ret; | |
3158 | } | |
3159 | ||
488f131b | 3160 | int |
7bda5e4a | 3161 | signal_print_update (int signo, int state) |
d4f3574e SS |
3162 | { |
3163 | int ret = signal_print[signo]; | |
3164 | signal_print[signo] = state; | |
3165 | return ret; | |
3166 | } | |
3167 | ||
488f131b | 3168 | int |
7bda5e4a | 3169 | signal_pass_update (int signo, int state) |
d4f3574e SS |
3170 | { |
3171 | int ret = signal_program[signo]; | |
3172 | signal_program[signo] = state; | |
3173 | return ret; | |
3174 | } | |
3175 | ||
c906108c | 3176 | static void |
96baa820 | 3177 | sig_print_header (void) |
c906108c SS |
3178 | { |
3179 | printf_filtered ("\ | |
3180 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3181 | } | |
3182 | ||
3183 | static void | |
96baa820 | 3184 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3185 | { |
3186 | char *name = target_signal_to_name (oursig); | |
3187 | int name_padding = 13 - strlen (name); | |
96baa820 | 3188 | |
c906108c SS |
3189 | if (name_padding <= 0) |
3190 | name_padding = 0; | |
3191 | ||
3192 | printf_filtered ("%s", name); | |
488f131b | 3193 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
3194 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
3195 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3196 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3197 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3198 | } | |
3199 | ||
3200 | /* Specify how various signals in the inferior should be handled. */ | |
3201 | ||
3202 | static void | |
96baa820 | 3203 | handle_command (char *args, int from_tty) |
c906108c SS |
3204 | { |
3205 | char **argv; | |
3206 | int digits, wordlen; | |
3207 | int sigfirst, signum, siglast; | |
3208 | enum target_signal oursig; | |
3209 | int allsigs; | |
3210 | int nsigs; | |
3211 | unsigned char *sigs; | |
3212 | struct cleanup *old_chain; | |
3213 | ||
3214 | if (args == NULL) | |
3215 | { | |
3216 | error_no_arg ("signal to handle"); | |
3217 | } | |
3218 | ||
3219 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3220 | ||
3221 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3222 | sigs = (unsigned char *) alloca (nsigs); | |
3223 | memset (sigs, 0, nsigs); | |
3224 | ||
3225 | /* Break the command line up into args. */ | |
3226 | ||
3227 | argv = buildargv (args); | |
3228 | if (argv == NULL) | |
3229 | { | |
3230 | nomem (0); | |
3231 | } | |
7a292a7a | 3232 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3233 | |
3234 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3235 | actions. Signal numbers and signal names may be interspersed with | |
3236 | actions, with the actions being performed for all signals cumulatively | |
3237 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3238 | ||
3239 | while (*argv != NULL) | |
3240 | { | |
3241 | wordlen = strlen (*argv); | |
3242 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3243 | {; | |
3244 | } | |
3245 | allsigs = 0; | |
3246 | sigfirst = siglast = -1; | |
3247 | ||
3248 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3249 | { | |
3250 | /* Apply action to all signals except those used by the | |
3251 | debugger. Silently skip those. */ | |
3252 | allsigs = 1; | |
3253 | sigfirst = 0; | |
3254 | siglast = nsigs - 1; | |
3255 | } | |
3256 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3257 | { | |
3258 | SET_SIGS (nsigs, sigs, signal_stop); | |
3259 | SET_SIGS (nsigs, sigs, signal_print); | |
3260 | } | |
3261 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3262 | { | |
3263 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3264 | } | |
3265 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3266 | { | |
3267 | SET_SIGS (nsigs, sigs, signal_print); | |
3268 | } | |
3269 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3270 | { | |
3271 | SET_SIGS (nsigs, sigs, signal_program); | |
3272 | } | |
3273 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3274 | { | |
3275 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3276 | } | |
3277 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3278 | { | |
3279 | SET_SIGS (nsigs, sigs, signal_program); | |
3280 | } | |
3281 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3282 | { | |
3283 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3284 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3285 | } | |
3286 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3287 | { | |
3288 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3289 | } | |
3290 | else if (digits > 0) | |
3291 | { | |
3292 | /* It is numeric. The numeric signal refers to our own | |
3293 | internal signal numbering from target.h, not to host/target | |
3294 | signal number. This is a feature; users really should be | |
3295 | using symbolic names anyway, and the common ones like | |
3296 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3297 | ||
3298 | sigfirst = siglast = (int) | |
3299 | target_signal_from_command (atoi (*argv)); | |
3300 | if ((*argv)[digits] == '-') | |
3301 | { | |
3302 | siglast = (int) | |
3303 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3304 | } | |
3305 | if (sigfirst > siglast) | |
3306 | { | |
3307 | /* Bet he didn't figure we'd think of this case... */ | |
3308 | signum = sigfirst; | |
3309 | sigfirst = siglast; | |
3310 | siglast = signum; | |
3311 | } | |
3312 | } | |
3313 | else | |
3314 | { | |
3315 | oursig = target_signal_from_name (*argv); | |
3316 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3317 | { | |
3318 | sigfirst = siglast = (int) oursig; | |
3319 | } | |
3320 | else | |
3321 | { | |
3322 | /* Not a number and not a recognized flag word => complain. */ | |
3323 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3324 | } | |
3325 | } | |
3326 | ||
3327 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3328 | which signals to apply actions to. */ |
c906108c SS |
3329 | |
3330 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3331 | { | |
3332 | switch ((enum target_signal) signum) | |
3333 | { | |
3334 | case TARGET_SIGNAL_TRAP: | |
3335 | case TARGET_SIGNAL_INT: | |
3336 | if (!allsigs && !sigs[signum]) | |
3337 | { | |
3338 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 3339 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
3340 | { |
3341 | sigs[signum] = 1; | |
3342 | } | |
3343 | else | |
3344 | { | |
3345 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3346 | gdb_flush (gdb_stdout); | |
3347 | } | |
3348 | } | |
3349 | break; | |
3350 | case TARGET_SIGNAL_0: | |
3351 | case TARGET_SIGNAL_DEFAULT: | |
3352 | case TARGET_SIGNAL_UNKNOWN: | |
3353 | /* Make sure that "all" doesn't print these. */ | |
3354 | break; | |
3355 | default: | |
3356 | sigs[signum] = 1; | |
3357 | break; | |
3358 | } | |
3359 | } | |
3360 | ||
3361 | argv++; | |
3362 | } | |
3363 | ||
39f77062 | 3364 | target_notice_signals (inferior_ptid); |
c906108c SS |
3365 | |
3366 | if (from_tty) | |
3367 | { | |
3368 | /* Show the results. */ | |
3369 | sig_print_header (); | |
3370 | for (signum = 0; signum < nsigs; signum++) | |
3371 | { | |
3372 | if (sigs[signum]) | |
3373 | { | |
3374 | sig_print_info (signum); | |
3375 | } | |
3376 | } | |
3377 | } | |
3378 | ||
3379 | do_cleanups (old_chain); | |
3380 | } | |
3381 | ||
3382 | static void | |
96baa820 | 3383 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3384 | { |
3385 | char **argv; | |
3386 | struct cleanup *old_chain; | |
3387 | ||
3388 | /* Break the command line up into args. */ | |
3389 | ||
3390 | argv = buildargv (args); | |
3391 | if (argv == NULL) | |
3392 | { | |
3393 | nomem (0); | |
3394 | } | |
7a292a7a | 3395 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3396 | if (argv[1] != (char *) NULL) |
3397 | { | |
3398 | char *argBuf; | |
3399 | int bufLen; | |
3400 | ||
3401 | bufLen = strlen (argv[0]) + 20; | |
3402 | argBuf = (char *) xmalloc (bufLen); | |
3403 | if (argBuf) | |
3404 | { | |
3405 | int validFlag = 1; | |
3406 | enum target_signal oursig; | |
3407 | ||
3408 | oursig = target_signal_from_name (argv[0]); | |
3409 | memset (argBuf, 0, bufLen); | |
3410 | if (strcmp (argv[1], "Q") == 0) | |
3411 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3412 | else | |
3413 | { | |
3414 | if (strcmp (argv[1], "s") == 0) | |
3415 | { | |
3416 | if (!signal_stop[oursig]) | |
3417 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3418 | else | |
3419 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3420 | } | |
3421 | else if (strcmp (argv[1], "i") == 0) | |
3422 | { | |
3423 | if (!signal_program[oursig]) | |
3424 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3425 | else | |
3426 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3427 | } | |
3428 | else if (strcmp (argv[1], "r") == 0) | |
3429 | { | |
3430 | if (!signal_print[oursig]) | |
3431 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3432 | else | |
3433 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3434 | } | |
3435 | else | |
3436 | validFlag = 0; | |
3437 | } | |
3438 | if (validFlag) | |
3439 | handle_command (argBuf, from_tty); | |
3440 | else | |
3441 | printf_filtered ("Invalid signal handling flag.\n"); | |
3442 | if (argBuf) | |
b8c9b27d | 3443 | xfree (argBuf); |
c906108c SS |
3444 | } |
3445 | } | |
3446 | do_cleanups (old_chain); | |
3447 | } | |
3448 | ||
3449 | /* Print current contents of the tables set by the handle command. | |
3450 | It is possible we should just be printing signals actually used | |
3451 | by the current target (but for things to work right when switching | |
3452 | targets, all signals should be in the signal tables). */ | |
3453 | ||
3454 | static void | |
96baa820 | 3455 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3456 | { |
3457 | enum target_signal oursig; | |
3458 | sig_print_header (); | |
3459 | ||
3460 | if (signum_exp) | |
3461 | { | |
3462 | /* First see if this is a symbol name. */ | |
3463 | oursig = target_signal_from_name (signum_exp); | |
3464 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3465 | { | |
3466 | /* No, try numeric. */ | |
3467 | oursig = | |
bb518678 | 3468 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3469 | } |
3470 | sig_print_info (oursig); | |
3471 | return; | |
3472 | } | |
3473 | ||
3474 | printf_filtered ("\n"); | |
3475 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3476 | for (oursig = TARGET_SIGNAL_FIRST; | |
3477 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3478 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3479 | { | |
3480 | QUIT; | |
3481 | ||
3482 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 3483 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
3484 | sig_print_info (oursig); |
3485 | } | |
3486 | ||
3487 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3488 | } | |
3489 | \f | |
7a292a7a SS |
3490 | struct inferior_status |
3491 | { | |
3492 | enum target_signal stop_signal; | |
3493 | CORE_ADDR stop_pc; | |
3494 | bpstat stop_bpstat; | |
3495 | int stop_step; | |
3496 | int stop_stack_dummy; | |
3497 | int stopped_by_random_signal; | |
3498 | int trap_expected; | |
3499 | CORE_ADDR step_range_start; | |
3500 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 3501 | struct frame_id step_frame_id; |
5fbbeb29 | 3502 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3503 | CORE_ADDR step_resume_break_address; |
3504 | int stop_after_trap; | |
3505 | int stop_soon_quietly; | |
72cec141 | 3506 | struct regcache *stop_registers; |
7a292a7a SS |
3507 | |
3508 | /* These are here because if call_function_by_hand has written some | |
3509 | registers and then decides to call error(), we better not have changed | |
3510 | any registers. */ | |
72cec141 | 3511 | struct regcache *registers; |
7a292a7a | 3512 | |
101dcfbe AC |
3513 | /* A frame unique identifier. */ |
3514 | struct frame_id selected_frame_id; | |
3515 | ||
7a292a7a SS |
3516 | int breakpoint_proceeded; |
3517 | int restore_stack_info; | |
3518 | int proceed_to_finish; | |
3519 | }; | |
3520 | ||
7a292a7a | 3521 | void |
96baa820 JM |
3522 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3523 | LONGEST val) | |
7a292a7a | 3524 | { |
c5aa993b | 3525 | int size = REGISTER_RAW_SIZE (regno); |
7a292a7a SS |
3526 | void *buf = alloca (size); |
3527 | store_signed_integer (buf, size, val); | |
0818c12a | 3528 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
3529 | } |
3530 | ||
c906108c SS |
3531 | /* Save all of the information associated with the inferior<==>gdb |
3532 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3533 | (defined in inferior.h). */ | |
3534 | ||
7a292a7a | 3535 | struct inferior_status * |
96baa820 | 3536 | save_inferior_status (int restore_stack_info) |
c906108c | 3537 | { |
72cec141 | 3538 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 3539 | |
c906108c SS |
3540 | inf_status->stop_signal = stop_signal; |
3541 | inf_status->stop_pc = stop_pc; | |
3542 | inf_status->stop_step = stop_step; | |
3543 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3544 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3545 | inf_status->trap_expected = trap_expected; | |
3546 | inf_status->step_range_start = step_range_start; | |
3547 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 3548 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
3549 | inf_status->step_over_calls = step_over_calls; |
3550 | inf_status->stop_after_trap = stop_after_trap; | |
3551 | inf_status->stop_soon_quietly = stop_soon_quietly; | |
3552 | /* Save original bpstat chain here; replace it with copy of chain. | |
3553 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3554 | hand them back the original chain when restore_inferior_status is |
3555 | called. */ | |
c906108c SS |
3556 | inf_status->stop_bpstat = stop_bpstat; |
3557 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3558 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3559 | inf_status->restore_stack_info = restore_stack_info; | |
3560 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3561 | |
72cec141 | 3562 | inf_status->stop_registers = regcache_dup_no_passthrough (stop_registers); |
c906108c | 3563 | |
72cec141 | 3564 | inf_status->registers = regcache_dup (current_regcache); |
c906108c | 3565 | |
7a424e99 | 3566 | inf_status->selected_frame_id = get_frame_id (deprecated_selected_frame); |
7a292a7a | 3567 | return inf_status; |
c906108c SS |
3568 | } |
3569 | ||
c906108c | 3570 | static int |
96baa820 | 3571 | restore_selected_frame (void *args) |
c906108c | 3572 | { |
488f131b | 3573 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 3574 | struct frame_info *frame; |
c906108c | 3575 | |
101dcfbe | 3576 | frame = frame_find_by_id (*fid); |
c906108c | 3577 | |
aa0cd9c1 AC |
3578 | /* If inf_status->selected_frame_id is NULL, there was no previously |
3579 | selected frame. */ | |
101dcfbe | 3580 | if (frame == NULL) |
c906108c SS |
3581 | { |
3582 | warning ("Unable to restore previously selected frame.\n"); | |
3583 | return 0; | |
3584 | } | |
3585 | ||
0f7d239c | 3586 | select_frame (frame); |
c906108c SS |
3587 | |
3588 | return (1); | |
3589 | } | |
3590 | ||
3591 | void | |
96baa820 | 3592 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3593 | { |
3594 | stop_signal = inf_status->stop_signal; | |
3595 | stop_pc = inf_status->stop_pc; | |
3596 | stop_step = inf_status->stop_step; | |
3597 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3598 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3599 | trap_expected = inf_status->trap_expected; | |
3600 | step_range_start = inf_status->step_range_start; | |
3601 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 3602 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
3603 | step_over_calls = inf_status->step_over_calls; |
3604 | stop_after_trap = inf_status->stop_after_trap; | |
3605 | stop_soon_quietly = inf_status->stop_soon_quietly; | |
3606 | bpstat_clear (&stop_bpstat); | |
3607 | stop_bpstat = inf_status->stop_bpstat; | |
3608 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3609 | proceed_to_finish = inf_status->proceed_to_finish; | |
3610 | ||
72cec141 AC |
3611 | /* FIXME: Is the restore of stop_registers always needed. */ |
3612 | regcache_xfree (stop_registers); | |
3613 | stop_registers = inf_status->stop_registers; | |
c906108c SS |
3614 | |
3615 | /* The inferior can be gone if the user types "print exit(0)" | |
3616 | (and perhaps other times). */ | |
3617 | if (target_has_execution) | |
72cec141 AC |
3618 | /* NB: The register write goes through to the target. */ |
3619 | regcache_cpy (current_regcache, inf_status->registers); | |
3620 | regcache_xfree (inf_status->registers); | |
c906108c | 3621 | |
c906108c SS |
3622 | /* FIXME: If we are being called after stopping in a function which |
3623 | is called from gdb, we should not be trying to restore the | |
3624 | selected frame; it just prints a spurious error message (The | |
3625 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3626 | clobbers the stack)). In fact, should we be restoring the | |
3627 | inferior status at all in that case? . */ | |
3628 | ||
3629 | if (target_has_stack && inf_status->restore_stack_info) | |
3630 | { | |
c906108c | 3631 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
3632 | walking the stack might encounter a garbage pointer and |
3633 | error() trying to dereference it. */ | |
488f131b JB |
3634 | if (catch_errors |
3635 | (restore_selected_frame, &inf_status->selected_frame_id, | |
3636 | "Unable to restore previously selected frame:\n", | |
3637 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
3638 | /* Error in restoring the selected frame. Select the innermost |
3639 | frame. */ | |
0f7d239c | 3640 | select_frame (get_current_frame ()); |
c906108c SS |
3641 | |
3642 | } | |
c906108c | 3643 | |
72cec141 | 3644 | xfree (inf_status); |
7a292a7a | 3645 | } |
c906108c | 3646 | |
74b7792f AC |
3647 | static void |
3648 | do_restore_inferior_status_cleanup (void *sts) | |
3649 | { | |
3650 | restore_inferior_status (sts); | |
3651 | } | |
3652 | ||
3653 | struct cleanup * | |
3654 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
3655 | { | |
3656 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
3657 | } | |
3658 | ||
c906108c | 3659 | void |
96baa820 | 3660 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3661 | { |
3662 | /* See save_inferior_status for info on stop_bpstat. */ | |
3663 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 AC |
3664 | regcache_xfree (inf_status->registers); |
3665 | regcache_xfree (inf_status->stop_registers); | |
3666 | xfree (inf_status); | |
7a292a7a SS |
3667 | } |
3668 | ||
47932f85 DJ |
3669 | int |
3670 | inferior_has_forked (int pid, int *child_pid) | |
3671 | { | |
3672 | struct target_waitstatus last; | |
3673 | ptid_t last_ptid; | |
3674 | ||
3675 | get_last_target_status (&last_ptid, &last); | |
3676 | ||
3677 | if (last.kind != TARGET_WAITKIND_FORKED) | |
3678 | return 0; | |
3679 | ||
3680 | if (ptid_get_pid (last_ptid) != pid) | |
3681 | return 0; | |
3682 | ||
3683 | *child_pid = last.value.related_pid; | |
3684 | return 1; | |
3685 | } | |
3686 | ||
3687 | int | |
3688 | inferior_has_vforked (int pid, int *child_pid) | |
3689 | { | |
3690 | struct target_waitstatus last; | |
3691 | ptid_t last_ptid; | |
3692 | ||
3693 | get_last_target_status (&last_ptid, &last); | |
3694 | ||
3695 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
3696 | return 0; | |
3697 | ||
3698 | if (ptid_get_pid (last_ptid) != pid) | |
3699 | return 0; | |
3700 | ||
3701 | *child_pid = last.value.related_pid; | |
3702 | return 1; | |
3703 | } | |
3704 | ||
3705 | int | |
3706 | inferior_has_execd (int pid, char **execd_pathname) | |
3707 | { | |
3708 | struct target_waitstatus last; | |
3709 | ptid_t last_ptid; | |
3710 | ||
3711 | get_last_target_status (&last_ptid, &last); | |
3712 | ||
3713 | if (last.kind != TARGET_WAITKIND_EXECD) | |
3714 | return 0; | |
3715 | ||
3716 | if (ptid_get_pid (last_ptid) != pid) | |
3717 | return 0; | |
3718 | ||
3719 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
3720 | return 1; | |
3721 | } | |
3722 | ||
ca6724c1 KB |
3723 | /* Oft used ptids */ |
3724 | ptid_t null_ptid; | |
3725 | ptid_t minus_one_ptid; | |
3726 | ||
3727 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 3728 | |
ca6724c1 KB |
3729 | ptid_t |
3730 | ptid_build (int pid, long lwp, long tid) | |
3731 | { | |
3732 | ptid_t ptid; | |
3733 | ||
3734 | ptid.pid = pid; | |
3735 | ptid.lwp = lwp; | |
3736 | ptid.tid = tid; | |
3737 | return ptid; | |
3738 | } | |
3739 | ||
3740 | /* Create a ptid from just a pid. */ | |
3741 | ||
3742 | ptid_t | |
3743 | pid_to_ptid (int pid) | |
3744 | { | |
3745 | return ptid_build (pid, 0, 0); | |
3746 | } | |
3747 | ||
3748 | /* Fetch the pid (process id) component from a ptid. */ | |
3749 | ||
3750 | int | |
3751 | ptid_get_pid (ptid_t ptid) | |
3752 | { | |
3753 | return ptid.pid; | |
3754 | } | |
3755 | ||
3756 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
3757 | ||
3758 | long | |
3759 | ptid_get_lwp (ptid_t ptid) | |
3760 | { | |
3761 | return ptid.lwp; | |
3762 | } | |
3763 | ||
3764 | /* Fetch the tid (thread id) component from a ptid. */ | |
3765 | ||
3766 | long | |
3767 | ptid_get_tid (ptid_t ptid) | |
3768 | { | |
3769 | return ptid.tid; | |
3770 | } | |
3771 | ||
3772 | /* ptid_equal() is used to test equality of two ptids. */ | |
3773 | ||
3774 | int | |
3775 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
3776 | { | |
3777 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 3778 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
3779 | } |
3780 | ||
3781 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
3782 | to restore the inferior_ptid value saved in a call to | |
3783 | save_inferior_ptid(). */ | |
ce696e05 KB |
3784 | |
3785 | static void | |
3786 | restore_inferior_ptid (void *arg) | |
3787 | { | |
3788 | ptid_t *saved_ptid_ptr = arg; | |
3789 | inferior_ptid = *saved_ptid_ptr; | |
3790 | xfree (arg); | |
3791 | } | |
3792 | ||
3793 | /* Save the value of inferior_ptid so that it may be restored by a | |
3794 | later call to do_cleanups(). Returns the struct cleanup pointer | |
3795 | needed for later doing the cleanup. */ | |
3796 | ||
3797 | struct cleanup * | |
3798 | save_inferior_ptid (void) | |
3799 | { | |
3800 | ptid_t *saved_ptid_ptr; | |
3801 | ||
3802 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
3803 | *saved_ptid_ptr = inferior_ptid; | |
3804 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
3805 | } | |
c5aa993b | 3806 | \f |
488f131b | 3807 | |
7a292a7a | 3808 | static void |
96baa820 | 3809 | build_infrun (void) |
7a292a7a | 3810 | { |
72cec141 | 3811 | stop_registers = regcache_xmalloc (current_gdbarch); |
7a292a7a | 3812 | } |
c906108c | 3813 | |
c906108c | 3814 | void |
96baa820 | 3815 | _initialize_infrun (void) |
c906108c SS |
3816 | { |
3817 | register int i; | |
3818 | register int numsigs; | |
3819 | struct cmd_list_element *c; | |
3820 | ||
0f71a2f6 JM |
3821 | register_gdbarch_swap (&stop_registers, sizeof (stop_registers), NULL); |
3822 | register_gdbarch_swap (NULL, 0, build_infrun); | |
3823 | ||
c906108c SS |
3824 | add_info ("signals", signals_info, |
3825 | "What debugger does when program gets various signals.\n\ | |
3826 | Specify a signal as argument to print info on that signal only."); | |
3827 | add_info_alias ("handle", "signals", 0); | |
3828 | ||
3829 | add_com ("handle", class_run, handle_command, | |
3830 | concat ("Specify how to handle a signal.\n\ | |
3831 | Args are signals and actions to apply to those signals.\n\ | |
3832 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3833 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3834 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3835 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3836 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ |
c906108c SS |
3837 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
3838 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3839 | Print means print a message if this signal happens.\n\ | |
3840 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3841 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3842 | Pass and Stop may be combined.", NULL)); | |
3843 | if (xdb_commands) | |
3844 | { | |
3845 | add_com ("lz", class_info, signals_info, | |
3846 | "What debugger does when program gets various signals.\n\ | |
3847 | Specify a signal as argument to print info on that signal only."); | |
3848 | add_com ("z", class_run, xdb_handle_command, | |
3849 | concat ("Specify how to handle a signal.\n\ | |
3850 | Args are signals and actions to apply to those signals.\n\ | |
3851 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
3852 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
3853 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
3854 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
488f131b | 3855 | used by the debugger, typically SIGTRAP and SIGINT.\n", "Recognized actions include \"s\" (toggles between stop and nostop), \n\ |
c906108c SS |
3856 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
3857 | nopass), \"Q\" (noprint)\n\ | |
3858 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
3859 | Print means print a message if this signal happens.\n\ | |
3860 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
3861 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
3862 | Pass and Stop may be combined.", NULL)); | |
3863 | } | |
3864 | ||
3865 | if (!dbx_commands) | |
488f131b JB |
3866 | stop_command = |
3867 | 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 |
3868 | This allows you to set a list of commands to be run each time execution\n\ |
3869 | of the program stops.", &cmdlist); | |
3870 | ||
3871 | numsigs = (int) TARGET_SIGNAL_LAST; | |
488f131b | 3872 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
3873 | signal_print = (unsigned char *) |
3874 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
3875 | signal_program = (unsigned char *) | |
3876 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
3877 | for (i = 0; i < numsigs; i++) | |
3878 | { | |
3879 | signal_stop[i] = 1; | |
3880 | signal_print[i] = 1; | |
3881 | signal_program[i] = 1; | |
3882 | } | |
3883 | ||
3884 | /* Signals caused by debugger's own actions | |
3885 | should not be given to the program afterwards. */ | |
3886 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
3887 | signal_program[TARGET_SIGNAL_INT] = 0; | |
3888 | ||
3889 | /* Signals that are not errors should not normally enter the debugger. */ | |
3890 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
3891 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
3892 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
3893 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
3894 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
3895 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
3896 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
3897 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
3898 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
3899 | signal_print[TARGET_SIGNAL_IO] = 0; | |
3900 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
3901 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
3902 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
3903 | signal_print[TARGET_SIGNAL_URG] = 0; | |
3904 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
3905 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
3906 | ||
cd0fc7c3 SS |
3907 | /* These signals are used internally by user-level thread |
3908 | implementations. (See signal(5) on Solaris.) Like the above | |
3909 | signals, a healthy program receives and handles them as part of | |
3910 | its normal operation. */ | |
3911 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
3912 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
3913 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
3914 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
3915 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
3916 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
3917 | ||
c906108c SS |
3918 | #ifdef SOLIB_ADD |
3919 | add_show_from_set | |
3920 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, | |
3921 | (char *) &stop_on_solib_events, | |
3922 | "Set stopping for shared library events.\n\ | |
3923 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
3924 | notifies gdb of shared library events. The most common event of interest\n\ | |
488f131b | 3925 | to the user would be loading/unloading of a new library.\n", &setlist), &showlist); |
c906108c SS |
3926 | #endif |
3927 | ||
3928 | c = add_set_enum_cmd ("follow-fork-mode", | |
3929 | class_run, | |
488f131b | 3930 | follow_fork_mode_kind_names, &follow_fork_mode_string, |
c906108c SS |
3931 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 |
3932 | kernel problem. It's also not terribly useful without a GUI to | |
3933 | help the user drive two debuggers. So for now, I'm disabling | |
3934 | the "both" option. */ | |
c5aa993b JM |
3935 | /* "Set debugger response to a program call of fork \ |
3936 | or vfork.\n\ | |
3937 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
3938 | parent - the original process is debugged after a fork\n\ | |
3939 | child - the new process is debugged after a fork\n\ | |
3940 | both - both the parent and child are debugged after a fork\n\ | |
3941 | ask - the debugger will ask for one of the above choices\n\ | |
3942 | For \"both\", another copy of the debugger will be started to follow\n\ | |
3943 | the new child process. The original debugger will continue to follow\n\ | |
3944 | the original parent process. To distinguish their prompts, the\n\ | |
3945 | debugger copy's prompt will be changed.\n\ | |
3946 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
3947 | By default, the debugger will follow the parent process.", | |
3948 | */ | |
c906108c SS |
3949 | "Set debugger response to a program call of fork \ |
3950 | or vfork.\n\ | |
3951 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
3952 | parent - the original process is debugged after a fork\n\ | |
3953 | child - the new process is debugged after a fork\n\ | |
3954 | ask - the debugger will ask for one of the above choices\n\ | |
3955 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
488f131b | 3956 | By default, the debugger will follow the parent process.", &setlist); |
c906108c SS |
3957 | add_show_from_set (c, &showlist); |
3958 | ||
488f131b | 3959 | c = add_set_enum_cmd ("scheduler-locking", class_run, scheduler_enums, /* array of string names */ |
1ed2a135 | 3960 | &scheduler_mode, /* current mode */ |
c906108c SS |
3961 | "Set mode for locking scheduler during execution.\n\ |
3962 | off == no locking (threads may preempt at any time)\n\ | |
3963 | on == full locking (no thread except the current thread may run)\n\ | |
3964 | step == scheduler locked during every single-step operation.\n\ | |
3965 | In this mode, no other thread may run during a step command.\n\ | |
488f131b | 3966 | Other threads may run while stepping over a function call ('next').", &setlist); |
c906108c | 3967 | |
9f60d481 | 3968 | set_cmd_sfunc (c, set_schedlock_func); /* traps on target vector */ |
c906108c | 3969 | add_show_from_set (c, &showlist); |
5fbbeb29 CF |
3970 | |
3971 | c = add_set_cmd ("step-mode", class_run, | |
488f131b JB |
3972 | var_boolean, (char *) &step_stop_if_no_debug, |
3973 | "Set mode of the step operation. When set, doing a step over a\n\ | |
5fbbeb29 CF |
3974 | function without debug line information will stop at the first\n\ |
3975 | instruction of that function. Otherwise, the function is skipped and\n\ | |
488f131b | 3976 | the step command stops at a different source line.", &setlist); |
5fbbeb29 | 3977 | add_show_from_set (c, &showlist); |
ca6724c1 KB |
3978 | |
3979 | /* ptid initializations */ | |
3980 | null_ptid = ptid_build (0, 0, 0); | |
3981 | minus_one_ptid = ptid_build (-1, 0, 0); | |
3982 | inferior_ptid = null_ptid; | |
3983 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 3984 | } |