Commit | Line | Data |
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c906108c | 1 | /* Target-struct-independent code to start (run) and stop an inferior process. |
7a292a7a | 2 | Copyright 1986-1989, 1991-1999 Free Software Foundation, Inc. |
c906108c | 3 | |
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
c906108c | 10 | |
c5aa993b JM |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
c906108c | 15 | |
c5aa993b JM |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "gdb_string.h" | |
23 | #include <ctype.h> | |
24 | #include "symtab.h" | |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "breakpoint.h" | |
28 | #include "wait.h" | |
29 | #include "gdbcore.h" | |
30 | #include "gdbcmd.h" | |
31 | #include "target.h" | |
32 | #include "gdbthread.h" | |
33 | #include "annotate.h" | |
34 | #include "symfile.h" /* for overlay functions */ | |
7a292a7a | 35 | #include "top.h" |
c906108c | 36 | #include <signal.h> |
2acceee2 | 37 | #include "inf-loop.h" |
c906108c SS |
38 | |
39 | /* Prototypes for local functions */ | |
40 | ||
96baa820 | 41 | static void signals_info (char *, int); |
c906108c | 42 | |
96baa820 | 43 | static void handle_command (char *, int); |
c906108c | 44 | |
96baa820 | 45 | static void sig_print_info (enum target_signal); |
c906108c | 46 | |
96baa820 | 47 | static void sig_print_header (void); |
c906108c | 48 | |
96baa820 | 49 | static void resume_cleanups (int); |
c906108c | 50 | |
96baa820 | 51 | static int hook_stop_stub (void *); |
c906108c | 52 | |
96baa820 | 53 | static void delete_breakpoint_current_contents (void *); |
c906108c | 54 | |
96baa820 JM |
55 | static void set_follow_fork_mode_command (char *arg, int from_tty, |
56 | struct cmd_list_element * c); | |
7a292a7a | 57 | |
96baa820 JM |
58 | static struct inferior_status *xmalloc_inferior_status (void); |
59 | ||
60 | static void free_inferior_status (struct inferior_status *); | |
61 | ||
62 | static int restore_selected_frame (void *); | |
63 | ||
64 | static void build_infrun (void); | |
65 | ||
66 | static void follow_inferior_fork (int parent_pid, int child_pid, | |
67 | int has_forked, int has_vforked); | |
68 | ||
69 | static void follow_fork (int parent_pid, int child_pid); | |
70 | ||
71 | static void follow_vfork (int parent_pid, int child_pid); | |
72 | ||
73 | static void set_schedlock_func (char *args, int from_tty, | |
74 | struct cmd_list_element * c); | |
75 | ||
96baa820 JM |
76 | struct execution_control_state; |
77 | ||
78 | static int currently_stepping (struct execution_control_state *ecs); | |
79 | ||
80 | static void xdb_handle_command (char *args, int from_tty); | |
81 | ||
82 | void _initialize_infrun (void); | |
43ff13b4 | 83 | |
c906108c SS |
84 | int inferior_ignoring_startup_exec_events = 0; |
85 | int inferior_ignoring_leading_exec_events = 0; | |
86 | ||
43ff13b4 | 87 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 88 | |
43ff13b4 JM |
89 | int sync_execution = 0; |
90 | ||
c906108c SS |
91 | /* wait_for_inferior and normal_stop use this to notify the user |
92 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
93 | running in. */ |
94 | ||
c3f6f71d | 95 | static int previous_inferior_pid; |
7a292a7a SS |
96 | |
97 | /* This is true for configurations that may follow through execl() and | |
98 | similar functions. At present this is only true for HP-UX native. */ | |
99 | ||
100 | #ifndef MAY_FOLLOW_EXEC | |
101 | #define MAY_FOLLOW_EXEC (0) | |
c906108c SS |
102 | #endif |
103 | ||
7a292a7a SS |
104 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
105 | ||
c906108c SS |
106 | /* resume and wait_for_inferior use this to ensure that when |
107 | stepping over a hit breakpoint in a threaded application | |
108 | only the thread that hit the breakpoint is stepped and the | |
109 | other threads don't continue. This prevents having another | |
110 | thread run past the breakpoint while it is temporarily | |
111 | removed. | |
112 | ||
113 | This is not thread-specific, so it isn't saved as part of | |
114 | the infrun state. | |
115 | ||
116 | Versions of gdb which don't use the "step == this thread steps | |
117 | and others continue" model but instead use the "step == this | |
96baa820 JM |
118 | thread steps and others wait" shouldn't do this. */ |
119 | ||
c906108c SS |
120 | static int thread_step_needed = 0; |
121 | ||
7a292a7a SS |
122 | /* This is true if thread_step_needed should actually be used. At |
123 | present this is only true for HP-UX native. */ | |
124 | ||
125 | #ifndef USE_THREAD_STEP_NEEDED | |
126 | #define USE_THREAD_STEP_NEEDED (0) | |
127 | #endif | |
128 | ||
129 | static int use_thread_step_needed = USE_THREAD_STEP_NEEDED; | |
130 | ||
c906108c SS |
131 | /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the |
132 | program. It needs to examine the jmp_buf argument and extract the PC | |
133 | from it. The return value is non-zero on success, zero otherwise. */ | |
134 | ||
135 | #ifndef GET_LONGJMP_TARGET | |
136 | #define GET_LONGJMP_TARGET(PC_ADDR) 0 | |
137 | #endif | |
138 | ||
139 | ||
140 | /* Some machines have trampoline code that sits between function callers | |
141 | and the actual functions themselves. If this machine doesn't have | |
142 | such things, disable their processing. */ | |
143 | ||
144 | #ifndef SKIP_TRAMPOLINE_CODE | |
145 | #define SKIP_TRAMPOLINE_CODE(pc) 0 | |
146 | #endif | |
147 | ||
148 | /* Dynamic function trampolines are similar to solib trampolines in that they | |
149 | are between the caller and the callee. The difference is that when you | |
150 | enter a dynamic trampoline, you can't determine the callee's address. Some | |
151 | (usually complex) code needs to run in the dynamic trampoline to figure out | |
152 | the callee's address. This macro is usually called twice. First, when we | |
153 | enter the trampoline (looks like a normal function call at that point). It | |
154 | should return the PC of a point within the trampoline where the callee's | |
155 | address is known. Second, when we hit the breakpoint, this routine returns | |
156 | the callee's address. At that point, things proceed as per a step resume | |
157 | breakpoint. */ | |
158 | ||
159 | #ifndef DYNAMIC_TRAMPOLINE_NEXTPC | |
160 | #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0 | |
161 | #endif | |
162 | ||
d4f3574e SS |
163 | /* If the program uses ELF-style shared libraries, then calls to |
164 | functions in shared libraries go through stubs, which live in a | |
165 | table called the PLT (Procedure Linkage Table). The first time the | |
166 | function is called, the stub sends control to the dynamic linker, | |
167 | which looks up the function's real address, patches the stub so | |
168 | that future calls will go directly to the function, and then passes | |
169 | control to the function. | |
170 | ||
171 | If we are stepping at the source level, we don't want to see any of | |
172 | this --- we just want to skip over the stub and the dynamic linker. | |
173 | The simple approach is to single-step until control leaves the | |
174 | dynamic linker. | |
175 | ||
176 | However, on some systems (e.g., Red Hat Linux 5.2) the dynamic | |
177 | linker calls functions in the shared C library, so you can't tell | |
178 | from the PC alone whether the dynamic linker is still running. In | |
179 | this case, we use a step-resume breakpoint to get us past the | |
180 | dynamic linker, as if we were using "next" to step over a function | |
181 | call. | |
182 | ||
183 | IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic | |
184 | linker code or not. Normally, this means we single-step. However, | |
185 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
186 | address where we can place a step-resume breakpoint to get past the | |
187 | linker's symbol resolution function. | |
188 | ||
189 | IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a | |
190 | pretty portable way, by comparing the PC against the address ranges | |
191 | of the dynamic linker's sections. | |
192 | ||
193 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
194 | it depends on internal details of the dynamic linker. It's usually | |
195 | not too hard to figure out where to put a breakpoint, but it | |
196 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
197 | sanity checking. If it can't figure things out, returning zero and | |
198 | getting the (possibly confusing) stepping behavior is better than | |
199 | signalling an error, which will obscure the change in the | |
200 | inferior's state. */ | |
c906108c SS |
201 | |
202 | #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
203 | #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 | |
204 | #endif | |
205 | ||
d4f3574e SS |
206 | #ifndef SKIP_SOLIB_RESOLVER |
207 | #define SKIP_SOLIB_RESOLVER(pc) 0 | |
208 | #endif | |
209 | ||
c906108c SS |
210 | /* For SVR4 shared libraries, each call goes through a small piece of |
211 | trampoline code in the ".plt" section. IN_SOLIB_CALL_TRAMPOLINE evaluates | |
212 | to nonzero if we are current stopped in one of these. */ | |
213 | ||
214 | #ifndef IN_SOLIB_CALL_TRAMPOLINE | |
215 | #define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0 | |
216 | #endif | |
217 | ||
218 | /* In some shared library schemes, the return path from a shared library | |
219 | call may need to go through a trampoline too. */ | |
220 | ||
221 | #ifndef IN_SOLIB_RETURN_TRAMPOLINE | |
222 | #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0 | |
223 | #endif | |
224 | ||
225 | /* This function returns TRUE if pc is the address of an instruction | |
226 | that lies within the dynamic linker (such as the event hook, or the | |
227 | dld itself). | |
228 | ||
229 | This function must be used only when a dynamic linker event has | |
230 | been caught, and the inferior is being stepped out of the hook, or | |
231 | undefined results are guaranteed. */ | |
232 | ||
233 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
234 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
235 | #endif | |
236 | ||
237 | /* On MIPS16, a function that returns a floating point value may call | |
238 | a library helper function to copy the return value to a floating point | |
239 | register. The IGNORE_HELPER_CALL macro returns non-zero if we | |
240 | should ignore (i.e. step over) this function call. */ | |
241 | #ifndef IGNORE_HELPER_CALL | |
242 | #define IGNORE_HELPER_CALL(pc) 0 | |
243 | #endif | |
244 | ||
245 | /* On some systems, the PC may be left pointing at an instruction that won't | |
246 | actually be executed. This is usually indicated by a bit in the PSW. If | |
247 | we find ourselves in such a state, then we step the target beyond the | |
248 | nullified instruction before returning control to the user so as to avoid | |
249 | confusion. */ | |
250 | ||
251 | #ifndef INSTRUCTION_NULLIFIED | |
252 | #define INSTRUCTION_NULLIFIED 0 | |
253 | #endif | |
254 | ||
c2c6d25f JM |
255 | /* We can't step off a permanent breakpoint in the ordinary way, because we |
256 | can't remove it. Instead, we have to advance the PC to the next | |
257 | instruction. This macro should expand to a pointer to a function that | |
258 | does that, or zero if we have no such function. If we don't have a | |
259 | definition for it, we have to report an error. */ | |
260 | #ifndef SKIP_PERMANENT_BREAKPOINT | |
261 | #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint) | |
262 | static void | |
c2d11a7d | 263 | default_skip_permanent_breakpoint (void) |
c2c6d25f JM |
264 | { |
265 | error_begin (); | |
266 | fprintf_filtered (gdb_stderr, "\ | |
267 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
268 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
269 | a command like `return' or `jump' to continue execution.\n"); | |
270 | return_to_top_level (RETURN_ERROR); | |
271 | } | |
272 | #endif | |
273 | ||
274 | ||
7a292a7a SS |
275 | /* Convert the #defines into values. This is temporary until wfi control |
276 | flow is completely sorted out. */ | |
277 | ||
278 | #ifndef HAVE_STEPPABLE_WATCHPOINT | |
279 | #define HAVE_STEPPABLE_WATCHPOINT 0 | |
280 | #else | |
281 | #undef HAVE_STEPPABLE_WATCHPOINT | |
282 | #define HAVE_STEPPABLE_WATCHPOINT 1 | |
283 | #endif | |
284 | ||
285 | #ifndef HAVE_NONSTEPPABLE_WATCHPOINT | |
286 | #define HAVE_NONSTEPPABLE_WATCHPOINT 0 | |
287 | #else | |
288 | #undef HAVE_NONSTEPPABLE_WATCHPOINT | |
289 | #define HAVE_NONSTEPPABLE_WATCHPOINT 1 | |
290 | #endif | |
291 | ||
292 | #ifndef HAVE_CONTINUABLE_WATCHPOINT | |
293 | #define HAVE_CONTINUABLE_WATCHPOINT 0 | |
294 | #else | |
295 | #undef HAVE_CONTINUABLE_WATCHPOINT | |
296 | #define HAVE_CONTINUABLE_WATCHPOINT 1 | |
297 | #endif | |
298 | ||
c906108c SS |
299 | /* Tables of how to react to signals; the user sets them. */ |
300 | ||
301 | static unsigned char *signal_stop; | |
302 | static unsigned char *signal_print; | |
303 | static unsigned char *signal_program; | |
304 | ||
305 | #define SET_SIGS(nsigs,sigs,flags) \ | |
306 | do { \ | |
307 | int signum = (nsigs); \ | |
308 | while (signum-- > 0) \ | |
309 | if ((sigs)[signum]) \ | |
310 | (flags)[signum] = 1; \ | |
311 | } while (0) | |
312 | ||
313 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
314 | do { \ | |
315 | int signum = (nsigs); \ | |
316 | while (signum-- > 0) \ | |
317 | if ((sigs)[signum]) \ | |
318 | (flags)[signum] = 0; \ | |
319 | } while (0) | |
320 | ||
321 | ||
322 | /* Command list pointer for the "stop" placeholder. */ | |
323 | ||
324 | static struct cmd_list_element *stop_command; | |
325 | ||
326 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
327 | ||
328 | static int breakpoints_inserted; | |
329 | ||
330 | /* Function inferior was in as of last step command. */ | |
331 | ||
332 | static struct symbol *step_start_function; | |
333 | ||
334 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
335 | ||
336 | static int trap_expected; | |
337 | ||
338 | #ifdef SOLIB_ADD | |
339 | /* Nonzero if we want to give control to the user when we're notified | |
340 | of shared library events by the dynamic linker. */ | |
341 | static int stop_on_solib_events; | |
342 | #endif | |
343 | ||
344 | #ifdef HP_OS_BUG | |
345 | /* Nonzero if the next time we try to continue the inferior, it will | |
346 | step one instruction and generate a spurious trace trap. | |
347 | This is used to compensate for a bug in HP-UX. */ | |
348 | ||
349 | static int trap_expected_after_continue; | |
350 | #endif | |
351 | ||
352 | /* Nonzero means expecting a trace trap | |
353 | and should stop the inferior and return silently when it happens. */ | |
354 | ||
355 | int stop_after_trap; | |
356 | ||
357 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
358 | It is used after attach, due to attaching to a process; | |
359 | when running in the shell before the child program has been exec'd; | |
360 | and when running some kinds of remote stuff (FIXME?). */ | |
361 | ||
362 | int stop_soon_quietly; | |
363 | ||
364 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
365 | situation when stop_registers should be saved. */ | |
366 | ||
367 | int proceed_to_finish; | |
368 | ||
369 | /* Save register contents here when about to pop a stack dummy frame, | |
370 | if-and-only-if proceed_to_finish is set. | |
371 | Thus this contains the return value from the called function (assuming | |
372 | values are returned in a register). */ | |
373 | ||
7a292a7a | 374 | char *stop_registers; |
c906108c SS |
375 | |
376 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
377 | ||
378 | static int breakpoints_failed; | |
379 | ||
380 | /* Nonzero after stop if current stack frame should be printed. */ | |
381 | ||
382 | static int stop_print_frame; | |
383 | ||
384 | static struct breakpoint *step_resume_breakpoint = NULL; | |
385 | static struct breakpoint *through_sigtramp_breakpoint = NULL; | |
386 | ||
387 | /* On some platforms (e.g., HP-UX), hardware watchpoints have bad | |
388 | interactions with an inferior that is running a kernel function | |
389 | (aka, a system call or "syscall"). wait_for_inferior therefore | |
390 | may have a need to know when the inferior is in a syscall. This | |
391 | is a count of the number of inferior threads which are known to | |
392 | currently be running in a syscall. */ | |
393 | static int number_of_threads_in_syscalls; | |
394 | ||
395 | /* This is used to remember when a fork, vfork or exec event | |
396 | was caught by a catchpoint, and thus the event is to be | |
397 | followed at the next resume of the inferior, and not | |
398 | immediately. */ | |
399 | static struct | |
400 | { | |
401 | enum target_waitkind kind; | |
402 | struct | |
403 | { | |
404 | int parent_pid; | |
405 | int saw_parent_fork; | |
406 | int child_pid; | |
407 | int saw_child_fork; | |
408 | int saw_child_exec; | |
409 | } | |
410 | fork_event; | |
411 | char *execd_pathname; | |
412 | } | |
413 | pending_follow; | |
414 | ||
415 | /* Some platforms don't allow us to do anything meaningful with a | |
416 | vforked child until it has exec'd. Vforked processes on such | |
417 | platforms can only be followed after they've exec'd. | |
418 | ||
419 | When this is set to 0, a vfork can be immediately followed, | |
420 | and an exec can be followed merely as an exec. When this is | |
421 | set to 1, a vfork event has been seen, but cannot be followed | |
422 | until the exec is seen. | |
423 | ||
424 | (In the latter case, inferior_pid is still the parent of the | |
425 | vfork, and pending_follow.fork_event.child_pid is the child. The | |
426 | appropriate process is followed, according to the setting of | |
427 | follow-fork-mode.) */ | |
428 | static int follow_vfork_when_exec; | |
429 | ||
430 | static char *follow_fork_mode_kind_names[] = | |
431 | { | |
432 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 | |
433 | kernel problem. It's also not terribly useful without a GUI to | |
434 | help the user drive two debuggers. So for now, I'm disabling | |
435 | the "both" option. | |
c5aa993b JM |
436 | "parent", "child", "both", "ask" }; |
437 | */ | |
c906108c SS |
438 | "parent", "child", "ask"}; |
439 | ||
440 | static char *follow_fork_mode_string = NULL; | |
441 | \f | |
442 | ||
c906108c | 443 | static void |
96baa820 JM |
444 | follow_inferior_fork (int parent_pid, int child_pid, int has_forked, |
445 | int has_vforked) | |
c906108c SS |
446 | { |
447 | int followed_parent = 0; | |
448 | int followed_child = 0; | |
c906108c SS |
449 | |
450 | /* Which process did the user want us to follow? */ | |
451 | char *follow_mode = | |
96baa820 | 452 | savestring (follow_fork_mode_string, strlen (follow_fork_mode_string)); |
c906108c SS |
453 | |
454 | /* Or, did the user not know, and want us to ask? */ | |
455 | if (STREQ (follow_fork_mode_string, "ask")) | |
456 | { | |
457 | char requested_mode[100]; | |
458 | ||
459 | free (follow_mode); | |
460 | error ("\"ask\" mode NYI"); | |
461 | follow_mode = savestring (requested_mode, strlen (requested_mode)); | |
462 | } | |
463 | ||
464 | /* If we're to be following the parent, then detach from child_pid. | |
465 | We're already following the parent, so need do nothing explicit | |
466 | for it. */ | |
467 | if (STREQ (follow_mode, "parent")) | |
468 | { | |
469 | followed_parent = 1; | |
470 | ||
471 | /* We're already attached to the parent, by default. */ | |
472 | ||
473 | /* Before detaching from the child, remove all breakpoints from | |
474 | it. (This won't actually modify the breakpoint list, but will | |
475 | physically remove the breakpoints from the child.) */ | |
476 | if (!has_vforked || !follow_vfork_when_exec) | |
477 | { | |
478 | detach_breakpoints (child_pid); | |
7a292a7a | 479 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
c906108c | 480 | SOLIB_REMOVE_INFERIOR_HOOK (child_pid); |
7a292a7a | 481 | #endif |
c906108c SS |
482 | } |
483 | ||
484 | /* Detach from the child. */ | |
485 | dont_repeat (); | |
486 | ||
487 | target_require_detach (child_pid, "", 1); | |
488 | } | |
489 | ||
490 | /* If we're to be following the child, then attach to it, detach | |
491 | from inferior_pid, and set inferior_pid to child_pid. */ | |
492 | else if (STREQ (follow_mode, "child")) | |
493 | { | |
494 | char child_pid_spelling[100]; /* Arbitrary length. */ | |
495 | ||
496 | followed_child = 1; | |
497 | ||
498 | /* Before detaching from the parent, detach all breakpoints from | |
499 | the child. But only if we're forking, or if we follow vforks | |
500 | as soon as they happen. (If we're following vforks only when | |
501 | the child has exec'd, then it's very wrong to try to write | |
502 | back the "shadow contents" of inserted breakpoints now -- they | |
503 | belong to the child's pre-exec'd a.out.) */ | |
504 | if (!has_vforked || !follow_vfork_when_exec) | |
505 | { | |
506 | detach_breakpoints (child_pid); | |
507 | } | |
508 | ||
509 | /* Before detaching from the parent, remove all breakpoints from it. */ | |
510 | remove_breakpoints (); | |
511 | ||
512 | /* Also reset the solib inferior hook from the parent. */ | |
7a292a7a | 513 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
c906108c | 514 | SOLIB_REMOVE_INFERIOR_HOOK (inferior_pid); |
7a292a7a | 515 | #endif |
c906108c SS |
516 | |
517 | /* Detach from the parent. */ | |
518 | dont_repeat (); | |
519 | target_detach (NULL, 1); | |
520 | ||
521 | /* Attach to the child. */ | |
522 | inferior_pid = child_pid; | |
523 | sprintf (child_pid_spelling, "%d", child_pid); | |
524 | dont_repeat (); | |
525 | ||
526 | target_require_attach (child_pid_spelling, 1); | |
527 | ||
528 | /* Was there a step_resume breakpoint? (There was if the user | |
529 | did a "next" at the fork() call.) If so, explicitly reset its | |
530 | thread number. | |
531 | ||
532 | step_resumes are a form of bp that are made to be per-thread. | |
533 | Since we created the step_resume bp when the parent process | |
534 | was being debugged, and now are switching to the child process, | |
535 | from the breakpoint package's viewpoint, that's a switch of | |
536 | "threads". We must update the bp's notion of which thread | |
537 | it is for, or it'll be ignored when it triggers... */ | |
538 | if (step_resume_breakpoint && | |
539 | (!has_vforked || !follow_vfork_when_exec)) | |
540 | breakpoint_re_set_thread (step_resume_breakpoint); | |
541 | ||
542 | /* Reinsert all breakpoints in the child. (The user may've set | |
543 | breakpoints after catching the fork, in which case those | |
544 | actually didn't get set in the child, but only in the parent.) */ | |
545 | if (!has_vforked || !follow_vfork_when_exec) | |
546 | { | |
547 | breakpoint_re_set (); | |
548 | insert_breakpoints (); | |
549 | } | |
550 | } | |
551 | ||
552 | /* If we're to be following both parent and child, then fork ourselves, | |
553 | and attach the debugger clone to the child. */ | |
554 | else if (STREQ (follow_mode, "both")) | |
555 | { | |
556 | char pid_suffix[100]; /* Arbitrary length. */ | |
557 | ||
558 | /* Clone ourselves to follow the child. This is the end of our | |
c5aa993b | 559 | involvement with child_pid; our clone will take it from here... */ |
c906108c SS |
560 | dont_repeat (); |
561 | target_clone_and_follow_inferior (child_pid, &followed_child); | |
562 | followed_parent = !followed_child; | |
563 | ||
564 | /* We continue to follow the parent. To help distinguish the two | |
565 | debuggers, though, both we and our clone will reset our prompts. */ | |
566 | sprintf (pid_suffix, "[%d] ", inferior_pid); | |
567 | set_prompt (strcat (get_prompt (), pid_suffix)); | |
568 | } | |
569 | ||
570 | /* The parent and child of a vfork share the same address space. | |
571 | Also, on some targets the order in which vfork and exec events | |
572 | are received for parent in child requires some delicate handling | |
573 | of the events. | |
574 | ||
575 | For instance, on ptrace-based HPUX we receive the child's vfork | |
576 | event first, at which time the parent has been suspended by the | |
577 | OS and is essentially untouchable until the child's exit or second | |
578 | exec event arrives. At that time, the parent's vfork event is | |
579 | delivered to us, and that's when we see and decide how to follow | |
580 | the vfork. But to get to that point, we must continue the child | |
581 | until it execs or exits. To do that smoothly, all breakpoints | |
582 | must be removed from the child, in case there are any set between | |
583 | the vfork() and exec() calls. But removing them from the child | |
584 | also removes them from the parent, due to the shared-address-space | |
585 | nature of a vfork'd parent and child. On HPUX, therefore, we must | |
586 | take care to restore the bp's to the parent before we continue it. | |
587 | Else, it's likely that we may not stop in the expected place. (The | |
588 | worst scenario is when the user tries to step over a vfork() call; | |
589 | the step-resume bp must be restored for the step to properly stop | |
590 | in the parent after the call completes!) | |
591 | ||
592 | Sequence of events, as reported to gdb from HPUX: | |
593 | ||
c5aa993b JM |
594 | Parent Child Action for gdb to take |
595 | ------------------------------------------------------- | |
596 | 1 VFORK Continue child | |
597 | 2 EXEC | |
598 | 3 EXEC or EXIT | |
599 | 4 VFORK */ | |
c906108c SS |
600 | if (has_vforked) |
601 | { | |
602 | target_post_follow_vfork (parent_pid, | |
603 | followed_parent, | |
604 | child_pid, | |
605 | followed_child); | |
606 | } | |
607 | ||
608 | pending_follow.fork_event.saw_parent_fork = 0; | |
609 | pending_follow.fork_event.saw_child_fork = 0; | |
610 | ||
611 | free (follow_mode); | |
612 | } | |
613 | ||
614 | static void | |
96baa820 | 615 | follow_fork (int parent_pid, int child_pid) |
c906108c SS |
616 | { |
617 | follow_inferior_fork (parent_pid, child_pid, 1, 0); | |
618 | } | |
619 | ||
620 | ||
621 | /* Forward declaration. */ | |
96baa820 | 622 | static void follow_exec (int, char *); |
c906108c SS |
623 | |
624 | static void | |
96baa820 | 625 | follow_vfork (int parent_pid, int child_pid) |
c906108c SS |
626 | { |
627 | follow_inferior_fork (parent_pid, child_pid, 0, 1); | |
628 | ||
629 | /* Did we follow the child? Had it exec'd before we saw the parent vfork? */ | |
630 | if (pending_follow.fork_event.saw_child_exec && (inferior_pid == child_pid)) | |
631 | { | |
632 | pending_follow.fork_event.saw_child_exec = 0; | |
633 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
634 | follow_exec (inferior_pid, pending_follow.execd_pathname); | |
635 | free (pending_follow.execd_pathname); | |
636 | } | |
637 | } | |
c906108c SS |
638 | |
639 | static void | |
96baa820 | 640 | follow_exec (int pid, char *execd_pathname) |
c906108c | 641 | { |
c906108c | 642 | int saved_pid = pid; |
7a292a7a SS |
643 | struct target_ops *tgt; |
644 | ||
645 | if (!may_follow_exec) | |
646 | return; | |
c906108c SS |
647 | |
648 | /* Did this exec() follow a vfork()? If so, we must follow the | |
649 | vfork now too. Do it before following the exec. */ | |
650 | if (follow_vfork_when_exec && | |
651 | (pending_follow.kind == TARGET_WAITKIND_VFORKED)) | |
652 | { | |
653 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
654 | follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); | |
655 | follow_vfork_when_exec = 0; | |
656 | saved_pid = inferior_pid; | |
657 | ||
658 | /* Did we follow the parent? If so, we're done. If we followed | |
659 | the child then we must also follow its exec(). */ | |
660 | if (inferior_pid == pending_follow.fork_event.parent_pid) | |
661 | return; | |
662 | } | |
663 | ||
664 | /* This is an exec event that we actually wish to pay attention to. | |
665 | Refresh our symbol table to the newly exec'd program, remove any | |
666 | momentary bp's, etc. | |
667 | ||
668 | If there are breakpoints, they aren't really inserted now, | |
669 | since the exec() transformed our inferior into a fresh set | |
670 | of instructions. | |
671 | ||
672 | We want to preserve symbolic breakpoints on the list, since | |
673 | we have hopes that they can be reset after the new a.out's | |
674 | symbol table is read. | |
675 | ||
676 | However, any "raw" breakpoints must be removed from the list | |
677 | (e.g., the solib bp's), since their address is probably invalid | |
678 | now. | |
679 | ||
680 | And, we DON'T want to call delete_breakpoints() here, since | |
681 | that may write the bp's "shadow contents" (the instruction | |
682 | value that was overwritten witha TRAP instruction). Since | |
683 | we now have a new a.out, those shadow contents aren't valid. */ | |
684 | update_breakpoints_after_exec (); | |
685 | ||
686 | /* If there was one, it's gone now. We cannot truly step-to-next | |
687 | statement through an exec(). */ | |
688 | step_resume_breakpoint = NULL; | |
689 | step_range_start = 0; | |
690 | step_range_end = 0; | |
691 | ||
692 | /* If there was one, it's gone now. */ | |
693 | through_sigtramp_breakpoint = NULL; | |
694 | ||
695 | /* What is this a.out's name? */ | |
696 | printf_unfiltered ("Executing new program: %s\n", execd_pathname); | |
697 | ||
698 | /* We've followed the inferior through an exec. Therefore, the | |
699 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
700 | |
701 | /* First collect the run target in effect. */ | |
702 | tgt = find_run_target (); | |
703 | /* If we can't find one, things are in a very strange state... */ | |
704 | if (tgt == NULL) | |
705 | error ("Could find run target to save before following exec"); | |
706 | ||
c906108c SS |
707 | gdb_flush (gdb_stdout); |
708 | target_mourn_inferior (); | |
c5aa993b | 709 | inferior_pid = saved_pid; /* Because mourn_inferior resets inferior_pid. */ |
7a292a7a | 710 | push_target (tgt); |
c906108c SS |
711 | |
712 | /* That a.out is now the one to use. */ | |
713 | exec_file_attach (execd_pathname, 0); | |
714 | ||
715 | /* And also is where symbols can be found. */ | |
716 | symbol_file_command (execd_pathname, 0); | |
717 | ||
718 | /* Reset the shared library package. This ensures that we get | |
719 | a shlib event when the child reaches "_start", at which point | |
720 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 721 | #if defined(SOLIB_RESTART) |
c906108c | 722 | SOLIB_RESTART (); |
7a292a7a SS |
723 | #endif |
724 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
c906108c | 725 | SOLIB_CREATE_INFERIOR_HOOK (inferior_pid); |
7a292a7a | 726 | #endif |
c906108c SS |
727 | |
728 | /* Reinsert all breakpoints. (Those which were symbolic have | |
729 | been reset to the proper address in the new a.out, thanks | |
730 | to symbol_file_command...) */ | |
731 | insert_breakpoints (); | |
732 | ||
733 | /* The next resume of this inferior should bring it to the shlib | |
734 | startup breakpoints. (If the user had also set bp's on | |
735 | "main" from the old (parent) process, then they'll auto- | |
736 | matically get reset there in the new process.) */ | |
c906108c SS |
737 | } |
738 | ||
739 | /* Non-zero if we just simulating a single-step. This is needed | |
740 | because we cannot remove the breakpoints in the inferior process | |
741 | until after the `wait' in `wait_for_inferior'. */ | |
742 | static int singlestep_breakpoints_inserted_p = 0; | |
743 | \f | |
744 | ||
745 | /* Things to clean up if we QUIT out of resume (). */ | |
746 | /* ARGSUSED */ | |
747 | static void | |
96baa820 | 748 | resume_cleanups (int arg) |
c906108c SS |
749 | { |
750 | normal_stop (); | |
751 | } | |
752 | ||
753 | static char schedlock_off[] = "off"; | |
754 | static char schedlock_on[] = "on"; | |
755 | static char schedlock_step[] = "step"; | |
756 | static char *scheduler_mode = schedlock_off; | |
757 | static char *scheduler_enums[] = | |
758 | {schedlock_off, schedlock_on, schedlock_step}; | |
759 | ||
760 | static void | |
96baa820 | 761 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c SS |
762 | { |
763 | if (c->type == set_cmd) | |
764 | if (!target_can_lock_scheduler) | |
765 | { | |
766 | scheduler_mode = schedlock_off; | |
767 | error ("Target '%s' cannot support this command.", | |
768 | target_shortname); | |
769 | } | |
770 | } | |
771 | ||
772 | ||
c2c6d25f JM |
773 | |
774 | ||
c906108c SS |
775 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
776 | wants to interrupt some lengthy single-stepping operation | |
777 | (for child processes, the SIGINT goes to the inferior, and so | |
778 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
779 | other targets, that's not true). | |
780 | ||
781 | STEP nonzero if we should step (zero to continue instead). | |
782 | SIG is the signal to give the inferior (zero for none). */ | |
783 | void | |
96baa820 | 784 | resume (int step, enum target_signal sig) |
c906108c SS |
785 | { |
786 | int should_resume = 1; | |
787 | struct cleanup *old_cleanups = make_cleanup ((make_cleanup_func) | |
788 | resume_cleanups, 0); | |
789 | QUIT; | |
790 | ||
791 | #ifdef CANNOT_STEP_BREAKPOINT | |
792 | /* Most targets can step a breakpoint instruction, thus executing it | |
793 | normally. But if this one cannot, just continue and we will hit | |
794 | it anyway. */ | |
795 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
796 | step = 0; | |
797 | #endif | |
798 | ||
c2c6d25f JM |
799 | /* Normally, by the time we reach `resume', the breakpoints are either |
800 | removed or inserted, as appropriate. The exception is if we're sitting | |
801 | at a permanent breakpoint; we need to step over it, but permanent | |
802 | breakpoints can't be removed. So we have to test for it here. */ | |
803 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
804 | SKIP_PERMANENT_BREAKPOINT (); | |
805 | ||
c906108c SS |
806 | if (SOFTWARE_SINGLE_STEP_P && step) |
807 | { | |
808 | /* Do it the hard way, w/temp breakpoints */ | |
c5aa993b | 809 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
c906108c SS |
810 | /* ...and don't ask hardware to do it. */ |
811 | step = 0; | |
812 | /* and do not pull these breakpoints until after a `wait' in | |
813 | `wait_for_inferior' */ | |
814 | singlestep_breakpoints_inserted_p = 1; | |
815 | } | |
816 | ||
817 | /* Handle any optimized stores to the inferior NOW... */ | |
818 | #ifdef DO_DEFERRED_STORES | |
819 | DO_DEFERRED_STORES; | |
820 | #endif | |
821 | ||
c906108c SS |
822 | /* If there were any forks/vforks/execs that were caught and are |
823 | now to be followed, then do so. */ | |
824 | switch (pending_follow.kind) | |
825 | { | |
826 | case (TARGET_WAITKIND_FORKED): | |
827 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
828 | follow_fork (inferior_pid, pending_follow.fork_event.child_pid); | |
829 | break; | |
830 | ||
831 | case (TARGET_WAITKIND_VFORKED): | |
832 | { | |
833 | int saw_child_exec = pending_follow.fork_event.saw_child_exec; | |
834 | ||
835 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
836 | follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); | |
837 | ||
838 | /* Did we follow the child, but not yet see the child's exec event? | |
c5aa993b JM |
839 | If so, then it actually ought to be waiting for us; we respond to |
840 | parent vfork events. We don't actually want to resume the child | |
841 | in this situation; we want to just get its exec event. */ | |
c906108c SS |
842 | if (!saw_child_exec && |
843 | (inferior_pid == pending_follow.fork_event.child_pid)) | |
844 | should_resume = 0; | |
845 | } | |
846 | break; | |
847 | ||
848 | case (TARGET_WAITKIND_EXECD): | |
849 | /* If we saw a vfork event but couldn't follow it until we saw | |
c5aa993b | 850 | an exec, then now might be the time! */ |
c906108c SS |
851 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
852 | /* follow_exec is called as soon as the exec event is seen. */ | |
853 | break; | |
854 | ||
855 | default: | |
856 | break; | |
857 | } | |
c906108c SS |
858 | |
859 | /* Install inferior's terminal modes. */ | |
860 | target_terminal_inferior (); | |
861 | ||
862 | if (should_resume) | |
863 | { | |
7a292a7a | 864 | if (use_thread_step_needed && thread_step_needed) |
c906108c SS |
865 | { |
866 | /* We stopped on a BPT instruction; | |
867 | don't continue other threads and | |
868 | just step this thread. */ | |
869 | thread_step_needed = 0; | |
870 | ||
871 | if (!breakpoint_here_p (read_pc ())) | |
872 | { | |
873 | /* Breakpoint deleted: ok to do regular resume | |
c5aa993b | 874 | where all the threads either step or continue. */ |
c906108c SS |
875 | target_resume (-1, step, sig); |
876 | } | |
877 | else | |
878 | { | |
879 | if (!step) | |
880 | { | |
881 | warning ("Internal error, changing continue to step."); | |
882 | remove_breakpoints (); | |
883 | breakpoints_inserted = 0; | |
884 | trap_expected = 1; | |
885 | step = 1; | |
886 | } | |
887 | ||
888 | target_resume (inferior_pid, step, sig); | |
889 | } | |
890 | } | |
891 | else | |
c906108c SS |
892 | { |
893 | /* Vanilla resume. */ | |
894 | ||
895 | if ((scheduler_mode == schedlock_on) || | |
896 | (scheduler_mode == schedlock_step && step != 0)) | |
897 | target_resume (inferior_pid, step, sig); | |
898 | else | |
899 | target_resume (-1, step, sig); | |
900 | } | |
901 | } | |
902 | ||
903 | discard_cleanups (old_cleanups); | |
904 | } | |
905 | \f | |
906 | ||
907 | /* Clear out all variables saying what to do when inferior is continued. | |
908 | First do this, then set the ones you want, then call `proceed'. */ | |
909 | ||
910 | void | |
96baa820 | 911 | clear_proceed_status (void) |
c906108c SS |
912 | { |
913 | trap_expected = 0; | |
914 | step_range_start = 0; | |
915 | step_range_end = 0; | |
916 | step_frame_address = 0; | |
917 | step_over_calls = -1; | |
918 | stop_after_trap = 0; | |
919 | stop_soon_quietly = 0; | |
920 | proceed_to_finish = 0; | |
921 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
922 | ||
923 | /* Discard any remaining commands or status from previous stop. */ | |
924 | bpstat_clear (&stop_bpstat); | |
925 | } | |
926 | ||
927 | /* Basic routine for continuing the program in various fashions. | |
928 | ||
929 | ADDR is the address to resume at, or -1 for resume where stopped. | |
930 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 931 | or -1 for act according to how it stopped. |
c906108c | 932 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
933 | -1 means return after that and print nothing. |
934 | You should probably set various step_... variables | |
935 | before calling here, if you are stepping. | |
c906108c SS |
936 | |
937 | You should call clear_proceed_status before calling proceed. */ | |
938 | ||
939 | void | |
96baa820 | 940 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
941 | { |
942 | int oneproc = 0; | |
943 | ||
944 | if (step > 0) | |
945 | step_start_function = find_pc_function (read_pc ()); | |
946 | if (step < 0) | |
947 | stop_after_trap = 1; | |
948 | ||
2acceee2 | 949 | if (addr == (CORE_ADDR) -1) |
c906108c SS |
950 | { |
951 | /* If there is a breakpoint at the address we will resume at, | |
c5aa993b JM |
952 | step one instruction before inserting breakpoints |
953 | so that we do not stop right away (and report a second | |
c906108c SS |
954 | hit at this breakpoint). */ |
955 | ||
956 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) | |
957 | oneproc = 1; | |
958 | ||
959 | #ifndef STEP_SKIPS_DELAY | |
960 | #define STEP_SKIPS_DELAY(pc) (0) | |
961 | #define STEP_SKIPS_DELAY_P (0) | |
962 | #endif | |
963 | /* Check breakpoint_here_p first, because breakpoint_here_p is fast | |
c5aa993b JM |
964 | (it just checks internal GDB data structures) and STEP_SKIPS_DELAY |
965 | is slow (it needs to read memory from the target). */ | |
c906108c SS |
966 | if (STEP_SKIPS_DELAY_P |
967 | && breakpoint_here_p (read_pc () + 4) | |
968 | && STEP_SKIPS_DELAY (read_pc ())) | |
969 | oneproc = 1; | |
970 | } | |
971 | else | |
972 | { | |
973 | write_pc (addr); | |
974 | ||
975 | /* New address; we don't need to single-step a thread | |
c5aa993b JM |
976 | over a breakpoint we just hit, 'cause we aren't |
977 | continuing from there. | |
c906108c | 978 | |
c5aa993b JM |
979 | It's not worth worrying about the case where a user |
980 | asks for a "jump" at the current PC--if they get the | |
981 | hiccup of re-hiting a hit breakpoint, what else do | |
982 | they expect? */ | |
c906108c SS |
983 | thread_step_needed = 0; |
984 | } | |
985 | ||
986 | #ifdef PREPARE_TO_PROCEED | |
987 | /* In a multi-threaded task we may select another thread | |
988 | and then continue or step. | |
989 | ||
990 | But if the old thread was stopped at a breakpoint, it | |
991 | will immediately cause another breakpoint stop without | |
992 | any execution (i.e. it will report a breakpoint hit | |
993 | incorrectly). So we must step over it first. | |
994 | ||
995 | PREPARE_TO_PROCEED checks the current thread against the thread | |
996 | that reported the most recent event. If a step-over is required | |
997 | it returns TRUE and sets the current thread to the old thread. */ | |
9e086581 | 998 | if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ())) |
c906108c SS |
999 | { |
1000 | oneproc = 1; | |
1001 | thread_step_needed = 1; | |
1002 | } | |
1003 | ||
1004 | #endif /* PREPARE_TO_PROCEED */ | |
1005 | ||
1006 | #ifdef HP_OS_BUG | |
1007 | if (trap_expected_after_continue) | |
1008 | { | |
1009 | /* If (step == 0), a trap will be automatically generated after | |
c5aa993b JM |
1010 | the first instruction is executed. Force step one |
1011 | instruction to clear this condition. This should not occur | |
1012 | if step is nonzero, but it is harmless in that case. */ | |
c906108c SS |
1013 | oneproc = 1; |
1014 | trap_expected_after_continue = 0; | |
1015 | } | |
1016 | #endif /* HP_OS_BUG */ | |
1017 | ||
1018 | if (oneproc) | |
1019 | /* We will get a trace trap after one instruction. | |
1020 | Continue it automatically and insert breakpoints then. */ | |
1021 | trap_expected = 1; | |
1022 | else | |
1023 | { | |
1024 | int temp = insert_breakpoints (); | |
1025 | if (temp) | |
1026 | { | |
1027 | print_sys_errmsg ("ptrace", temp); | |
1028 | error ("Cannot insert breakpoints.\n\ | |
1029 | The same program may be running in another process."); | |
1030 | } | |
1031 | ||
1032 | breakpoints_inserted = 1; | |
1033 | } | |
1034 | ||
1035 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
1036 | stop_signal = siggnal; | |
1037 | /* If this signal should not be seen by program, | |
1038 | give it zero. Used for debugging signals. */ | |
1039 | else if (!signal_program[stop_signal]) | |
1040 | stop_signal = TARGET_SIGNAL_0; | |
1041 | ||
1042 | annotate_starting (); | |
1043 | ||
1044 | /* Make sure that output from GDB appears before output from the | |
1045 | inferior. */ | |
1046 | gdb_flush (gdb_stdout); | |
1047 | ||
1048 | /* Resume inferior. */ | |
1049 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
1050 | ||
1051 | /* Wait for it to stop (if not standalone) | |
1052 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
1053 | /* Do this only if we are not using the event loop, or if the target |
1054 | does not support asynchronous execution. */ | |
6426a772 | 1055 | if (!event_loop_p || !target_can_async_p ()) |
43ff13b4 JM |
1056 | { |
1057 | wait_for_inferior (); | |
1058 | normal_stop (); | |
1059 | } | |
c906108c SS |
1060 | } |
1061 | ||
1062 | /* Record the pc and sp of the program the last time it stopped. | |
1063 | These are just used internally by wait_for_inferior, but need | |
1064 | to be preserved over calls to it and cleared when the inferior | |
1065 | is started. */ | |
1066 | static CORE_ADDR prev_pc; | |
1067 | static CORE_ADDR prev_func_start; | |
1068 | static char *prev_func_name; | |
1069 | \f | |
1070 | ||
1071 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 1072 | |
c906108c | 1073 | void |
96baa820 | 1074 | start_remote (void) |
c906108c SS |
1075 | { |
1076 | init_thread_list (); | |
1077 | init_wait_for_inferior (); | |
1078 | stop_soon_quietly = 1; | |
1079 | trap_expected = 0; | |
43ff13b4 | 1080 | |
6426a772 JM |
1081 | /* Always go on waiting for the target, regardless of the mode. */ |
1082 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
1083 | indicate th wait_for_inferior that a target should timeout if | |
1084 | nothing is returned (instead of just blocking). Because of this, | |
1085 | targets expecting an immediate response need to, internally, set | |
1086 | things up so that the target_wait() is forced to eventually | |
1087 | timeout. */ | |
1088 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
1089 | differentiate to its caller what the state of the target is after | |
1090 | the initial open has been performed. Here we're assuming that | |
1091 | the target has stopped. It should be possible to eventually have | |
1092 | target_open() return to the caller an indication that the target | |
1093 | is currently running and GDB state should be set to the same as | |
1094 | for an async run. */ | |
1095 | wait_for_inferior (); | |
1096 | normal_stop (); | |
c906108c SS |
1097 | } |
1098 | ||
1099 | /* Initialize static vars when a new inferior begins. */ | |
1100 | ||
1101 | void | |
96baa820 | 1102 | init_wait_for_inferior (void) |
c906108c SS |
1103 | { |
1104 | /* These are meaningless until the first time through wait_for_inferior. */ | |
1105 | prev_pc = 0; | |
1106 | prev_func_start = 0; | |
1107 | prev_func_name = NULL; | |
1108 | ||
1109 | #ifdef HP_OS_BUG | |
1110 | trap_expected_after_continue = 0; | |
1111 | #endif | |
1112 | breakpoints_inserted = 0; | |
1113 | breakpoint_init_inferior (inf_starting); | |
1114 | ||
1115 | /* Don't confuse first call to proceed(). */ | |
1116 | stop_signal = TARGET_SIGNAL_0; | |
1117 | ||
1118 | /* The first resume is not following a fork/vfork/exec. */ | |
1119 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
1120 | pending_follow.fork_event.saw_parent_fork = 0; | |
1121 | pending_follow.fork_event.saw_child_fork = 0; | |
1122 | pending_follow.fork_event.saw_child_exec = 0; | |
1123 | ||
1124 | /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ | |
1125 | number_of_threads_in_syscalls = 0; | |
1126 | ||
1127 | clear_proceed_status (); | |
1128 | } | |
1129 | ||
1130 | static void | |
96baa820 | 1131 | delete_breakpoint_current_contents (void *arg) |
c906108c SS |
1132 | { |
1133 | struct breakpoint **breakpointp = (struct breakpoint **) arg; | |
1134 | if (*breakpointp != NULL) | |
1135 | { | |
1136 | delete_breakpoint (*breakpointp); | |
1137 | *breakpointp = NULL; | |
1138 | } | |
1139 | } | |
1140 | \f | |
b83266a0 SS |
1141 | /* This enum encodes possible reasons for doing a target_wait, so that |
1142 | wfi can call target_wait in one place. (Ultimately the call will be | |
1143 | moved out of the infinite loop entirely.) */ | |
1144 | ||
c5aa993b JM |
1145 | enum infwait_states |
1146 | { | |
cd0fc7c3 SS |
1147 | infwait_normal_state, |
1148 | infwait_thread_hop_state, | |
1149 | infwait_nullified_state, | |
1150 | infwait_nonstep_watch_state | |
b83266a0 SS |
1151 | }; |
1152 | ||
11cf8741 JM |
1153 | /* Why did the inferior stop? Used to print the appropriate messages |
1154 | to the interface from within handle_inferior_event(). */ | |
1155 | enum inferior_stop_reason | |
1156 | { | |
1157 | /* We don't know why. */ | |
1158 | STOP_UNKNOWN, | |
1159 | /* Step, next, nexti, stepi finished. */ | |
1160 | END_STEPPING_RANGE, | |
1161 | /* Found breakpoint. */ | |
1162 | BREAKPOINT_HIT, | |
1163 | /* Inferior terminated by signal. */ | |
1164 | SIGNAL_EXITED, | |
1165 | /* Inferior exited. */ | |
1166 | EXITED, | |
1167 | /* Inferior received signal, and user asked to be notified. */ | |
1168 | SIGNAL_RECEIVED | |
1169 | }; | |
1170 | ||
cd0fc7c3 SS |
1171 | /* This structure contains what used to be local variables in |
1172 | wait_for_inferior. Probably many of them can return to being | |
1173 | locals in handle_inferior_event. */ | |
1174 | ||
c5aa993b JM |
1175 | struct execution_control_state |
1176 | { | |
1177 | struct target_waitstatus ws; | |
1178 | struct target_waitstatus *wp; | |
1179 | int another_trap; | |
1180 | int random_signal; | |
1181 | CORE_ADDR stop_func_start; | |
1182 | CORE_ADDR stop_func_end; | |
1183 | char *stop_func_name; | |
1184 | struct symtab_and_line sal; | |
1185 | int remove_breakpoints_on_following_step; | |
1186 | int current_line; | |
1187 | struct symtab *current_symtab; | |
1188 | int handling_longjmp; /* FIXME */ | |
1189 | int pid; | |
1190 | int saved_inferior_pid; | |
1191 | int update_step_sp; | |
1192 | int stepping_through_solib_after_catch; | |
1193 | bpstat stepping_through_solib_catchpoints; | |
1194 | int enable_hw_watchpoints_after_wait; | |
1195 | int stepping_through_sigtramp; | |
1196 | int new_thread_event; | |
1197 | struct target_waitstatus tmpstatus; | |
1198 | enum infwait_states infwait_state; | |
1199 | int waiton_pid; | |
1200 | int wait_some_more; | |
1201 | }; | |
1202 | ||
96baa820 | 1203 | void init_execution_control_state (struct execution_control_state * ecs); |
c5aa993b | 1204 | |
96baa820 | 1205 | void handle_inferior_event (struct execution_control_state * ecs); |
cd0fc7c3 | 1206 | |
104c1213 | 1207 | static void check_sigtramp2 (struct execution_control_state *ecs); |
c2c6d25f | 1208 | static void step_into_function (struct execution_control_state *ecs); |
d4f3574e | 1209 | static void step_over_function (struct execution_control_state *ecs); |
104c1213 JM |
1210 | static void stop_stepping (struct execution_control_state *ecs); |
1211 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 1212 | static void keep_going (struct execution_control_state *ecs); |
11cf8741 | 1213 | static void print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info); |
104c1213 | 1214 | |
cd0fc7c3 SS |
1215 | /* Wait for control to return from inferior to debugger. |
1216 | If inferior gets a signal, we may decide to start it up again | |
1217 | instead of returning. That is why there is a loop in this function. | |
1218 | When this function actually returns it means the inferior | |
1219 | should be left stopped and GDB should read more commands. */ | |
1220 | ||
1221 | void | |
96baa820 | 1222 | wait_for_inferior (void) |
cd0fc7c3 SS |
1223 | { |
1224 | struct cleanup *old_cleanups; | |
1225 | struct execution_control_state ecss; | |
1226 | struct execution_control_state *ecs; | |
c906108c SS |
1227 | |
1228 | old_cleanups = make_cleanup (delete_breakpoint_current_contents, | |
1229 | &step_resume_breakpoint); | |
1230 | make_cleanup (delete_breakpoint_current_contents, | |
1231 | &through_sigtramp_breakpoint); | |
cd0fc7c3 SS |
1232 | |
1233 | /* wfi still stays in a loop, so it's OK just to take the address of | |
1234 | a local to get the ecs pointer. */ | |
1235 | ecs = &ecss; | |
1236 | ||
1237 | /* Fill in with reasonable starting values. */ | |
1238 | init_execution_control_state (ecs); | |
1239 | ||
c906108c SS |
1240 | thread_step_needed = 0; |
1241 | ||
c906108c | 1242 | /* We'll update this if & when we switch to a new thread. */ |
c3f6f71d | 1243 | previous_inferior_pid = inferior_pid; |
c906108c | 1244 | |
cd0fc7c3 SS |
1245 | overlay_cache_invalid = 1; |
1246 | ||
1247 | /* We have to invalidate the registers BEFORE calling target_wait | |
1248 | because they can be loaded from the target while in target_wait. | |
1249 | This makes remote debugging a bit more efficient for those | |
1250 | targets that provide critical registers as part of their normal | |
1251 | status mechanism. */ | |
1252 | ||
1253 | registers_changed (); | |
b83266a0 | 1254 | |
c906108c SS |
1255 | while (1) |
1256 | { | |
cd0fc7c3 SS |
1257 | if (target_wait_hook) |
1258 | ecs->pid = target_wait_hook (ecs->waiton_pid, ecs->wp); | |
1259 | else | |
1260 | ecs->pid = target_wait (ecs->waiton_pid, ecs->wp); | |
c906108c | 1261 | |
cd0fc7c3 SS |
1262 | /* Now figure out what to do with the result of the result. */ |
1263 | handle_inferior_event (ecs); | |
c906108c | 1264 | |
cd0fc7c3 SS |
1265 | if (!ecs->wait_some_more) |
1266 | break; | |
1267 | } | |
1268 | do_cleanups (old_cleanups); | |
1269 | } | |
c906108c | 1270 | |
43ff13b4 JM |
1271 | /* Asynchronous version of wait_for_inferior. It is called by the |
1272 | event loop whenever a change of state is detected on the file | |
1273 | descriptor corresponding to the target. It can be called more than | |
1274 | once to complete a single execution command. In such cases we need | |
1275 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1276 | last time that this function is called for a single execution | |
1277 | command, then report to the user that the inferior has stopped, and | |
1278 | do the necessary cleanups. */ | |
1279 | ||
1280 | struct execution_control_state async_ecss; | |
1281 | struct execution_control_state *async_ecs; | |
1282 | ||
1283 | void | |
c2c6d25f | 1284 | fetch_inferior_event (client_data) |
2acceee2 | 1285 | void *client_data; |
43ff13b4 JM |
1286 | { |
1287 | static struct cleanup *old_cleanups; | |
1288 | ||
c5aa993b | 1289 | async_ecs = &async_ecss; |
43ff13b4 JM |
1290 | |
1291 | if (!async_ecs->wait_some_more) | |
1292 | { | |
1293 | old_cleanups = make_exec_cleanup (delete_breakpoint_current_contents, | |
c5aa993b | 1294 | &step_resume_breakpoint); |
43ff13b4 | 1295 | make_exec_cleanup (delete_breakpoint_current_contents, |
c5aa993b | 1296 | &through_sigtramp_breakpoint); |
43ff13b4 JM |
1297 | |
1298 | /* Fill in with reasonable starting values. */ | |
1299 | init_execution_control_state (async_ecs); | |
1300 | ||
1301 | thread_step_needed = 0; | |
1302 | ||
1303 | /* We'll update this if & when we switch to a new thread. */ | |
c3f6f71d | 1304 | previous_inferior_pid = inferior_pid; |
43ff13b4 JM |
1305 | |
1306 | overlay_cache_invalid = 1; | |
1307 | ||
1308 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1309 | because they can be loaded from the target while in target_wait. |
1310 | This makes remote debugging a bit more efficient for those | |
1311 | targets that provide critical registers as part of their normal | |
1312 | status mechanism. */ | |
43ff13b4 JM |
1313 | |
1314 | registers_changed (); | |
1315 | } | |
1316 | ||
1317 | if (target_wait_hook) | |
1318 | async_ecs->pid = target_wait_hook (async_ecs->waiton_pid, async_ecs->wp); | |
1319 | else | |
1320 | async_ecs->pid = target_wait (async_ecs->waiton_pid, async_ecs->wp); | |
1321 | ||
1322 | /* Now figure out what to do with the result of the result. */ | |
1323 | handle_inferior_event (async_ecs); | |
1324 | ||
1325 | if (!async_ecs->wait_some_more) | |
1326 | { | |
adf40b2e JM |
1327 | /* Do only the cleanups that have been added by this |
1328 | function. Let the continuations for the commands do the rest, | |
1329 | if there are any. */ | |
43ff13b4 JM |
1330 | do_exec_cleanups (old_cleanups); |
1331 | normal_stop (); | |
c2d11a7d JM |
1332 | if (step_multi && stop_step) |
1333 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1334 | else | |
1335 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1336 | } |
1337 | } | |
1338 | ||
cd0fc7c3 SS |
1339 | /* Prepare an execution control state for looping through a |
1340 | wait_for_inferior-type loop. */ | |
1341 | ||
1342 | void | |
96baa820 | 1343 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1344 | { |
c2d11a7d | 1345 | /* ecs->another_trap? */ |
cd0fc7c3 SS |
1346 | ecs->random_signal = 0; |
1347 | ecs->remove_breakpoints_on_following_step = 0; | |
1348 | ecs->handling_longjmp = 0; /* FIXME */ | |
1349 | ecs->update_step_sp = 0; | |
1350 | ecs->stepping_through_solib_after_catch = 0; | |
1351 | ecs->stepping_through_solib_catchpoints = NULL; | |
1352 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1353 | ecs->stepping_through_sigtramp = 0; | |
1354 | ecs->sal = find_pc_line (prev_pc, 0); | |
1355 | ecs->current_line = ecs->sal.line; | |
1356 | ecs->current_symtab = ecs->sal.symtab; | |
1357 | ecs->infwait_state = infwait_normal_state; | |
1358 | ecs->waiton_pid = -1; | |
1359 | ecs->wp = &(ecs->ws); | |
1360 | } | |
1361 | ||
a0b3c4fd | 1362 | /* Call this function before setting step_resume_breakpoint, as a |
53a5351d JM |
1363 | sanity check. There should never be more than one step-resume |
1364 | breakpoint per thread, so we should never be setting a new | |
1365 | step_resume_breakpoint when one is already active. */ | |
a0b3c4fd | 1366 | static void |
96baa820 | 1367 | check_for_old_step_resume_breakpoint (void) |
a0b3c4fd JM |
1368 | { |
1369 | if (step_resume_breakpoint) | |
1370 | warning ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint"); | |
1371 | } | |
1372 | ||
cd0fc7c3 SS |
1373 | /* Given an execution control state that has been freshly filled in |
1374 | by an event from the inferior, figure out what it means and take | |
1375 | appropriate action. */ | |
c906108c | 1376 | |
cd0fc7c3 | 1377 | void |
96baa820 | 1378 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 SS |
1379 | { |
1380 | CORE_ADDR tmp; | |
1381 | int stepped_after_stopped_by_watchpoint; | |
1382 | ||
1383 | /* Keep this extra brace for now, minimizes diffs. */ | |
1384 | { | |
c5aa993b JM |
1385 | switch (ecs->infwait_state) |
1386 | { | |
1387 | case infwait_normal_state: | |
1388 | /* Since we've done a wait, we have a new event. Don't | |
1389 | carry over any expectations about needing to step over a | |
1390 | breakpoint. */ | |
1391 | thread_step_needed = 0; | |
1392 | ||
1393 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event | |
1394 | is serviced in this loop, below. */ | |
1395 | if (ecs->enable_hw_watchpoints_after_wait) | |
1396 | { | |
1397 | TARGET_ENABLE_HW_WATCHPOINTS (inferior_pid); | |
1398 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1399 | } | |
1400 | stepped_after_stopped_by_watchpoint = 0; | |
1401 | break; | |
b83266a0 | 1402 | |
c5aa993b JM |
1403 | case infwait_thread_hop_state: |
1404 | insert_breakpoints (); | |
c906108c | 1405 | |
c5aa993b JM |
1406 | /* We need to restart all the threads now, |
1407 | * unles we're running in scheduler-locked mode. | |
1408 | * FIXME: shouldn't we look at currently_stepping ()? | |
1409 | */ | |
1410 | if (scheduler_mode == schedlock_on) | |
1411 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
1412 | else | |
1413 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
1414 | ecs->infwait_state = infwait_normal_state; | |
104c1213 JM |
1415 | prepare_to_wait (ecs); |
1416 | return; | |
c906108c | 1417 | |
c5aa993b JM |
1418 | case infwait_nullified_state: |
1419 | break; | |
b83266a0 | 1420 | |
c5aa993b JM |
1421 | case infwait_nonstep_watch_state: |
1422 | insert_breakpoints (); | |
b83266a0 | 1423 | |
c5aa993b JM |
1424 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1425 | handle things like signals arriving and other things happening | |
1426 | in combination correctly? */ | |
1427 | stepped_after_stopped_by_watchpoint = 1; | |
1428 | break; | |
1429 | } | |
1430 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1431 | |
c5aa993b | 1432 | flush_cached_frames (); |
c906108c | 1433 | |
c5aa993b | 1434 | /* If it's a new process, add it to the thread database */ |
c906108c | 1435 | |
c5aa993b | 1436 | ecs->new_thread_event = ((ecs->pid != inferior_pid) && !in_thread_list (ecs->pid)); |
c906108c | 1437 | |
c5aa993b JM |
1438 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
1439 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
1440 | && ecs->new_thread_event) | |
1441 | { | |
1442 | add_thread (ecs->pid); | |
c906108c | 1443 | |
c5aa993b | 1444 | printf_filtered ("[New %s]\n", target_pid_or_tid_to_str (ecs->pid)); |
c906108c SS |
1445 | |
1446 | #if 0 | |
c5aa993b JM |
1447 | /* NOTE: This block is ONLY meant to be invoked in case of a |
1448 | "thread creation event"! If it is invoked for any other | |
1449 | sort of event (such as a new thread landing on a breakpoint), | |
1450 | the event will be discarded, which is almost certainly | |
1451 | a bad thing! | |
1452 | ||
1453 | To avoid this, the low-level module (eg. target_wait) | |
1454 | should call in_thread_list and add_thread, so that the | |
1455 | new thread is known by the time we get here. */ | |
1456 | ||
1457 | /* We may want to consider not doing a resume here in order | |
1458 | to give the user a chance to play with the new thread. | |
1459 | It might be good to make that a user-settable option. */ | |
1460 | ||
1461 | /* At this point, all threads are stopped (happens | |
1462 | automatically in either the OS or the native code). | |
1463 | Therefore we need to continue all threads in order to | |
1464 | make progress. */ | |
1465 | ||
1466 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1467 | prepare_to_wait (ecs); |
1468 | return; | |
c906108c | 1469 | #endif |
c5aa993b | 1470 | } |
c906108c | 1471 | |
c5aa993b JM |
1472 | switch (ecs->ws.kind) |
1473 | { | |
1474 | case TARGET_WAITKIND_LOADED: | |
1475 | /* Ignore gracefully during startup of the inferior, as it | |
1476 | might be the shell which has just loaded some objects, | |
1477 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1478 | #ifdef SOLIB_ADD |
c5aa993b JM |
1479 | if (!stop_soon_quietly) |
1480 | { | |
1481 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1482 | breakpoint addresses via breakpoint_re_set. */ | |
1483 | if (breakpoints_inserted) | |
1484 | remove_breakpoints (); | |
c906108c | 1485 | |
c5aa993b JM |
1486 | /* Check for any newly added shared libraries if we're |
1487 | supposed to be adding them automatically. */ | |
1488 | if (auto_solib_add) | |
1489 | { | |
1490 | /* Switch terminal for any messages produced by | |
1491 | breakpoint_re_set. */ | |
1492 | target_terminal_ours_for_output (); | |
1493 | SOLIB_ADD (NULL, 0, NULL); | |
1494 | target_terminal_inferior (); | |
1495 | } | |
c906108c | 1496 | |
c5aa993b JM |
1497 | /* Reinsert breakpoints and continue. */ |
1498 | if (breakpoints_inserted) | |
1499 | insert_breakpoints (); | |
1500 | } | |
c906108c | 1501 | #endif |
c5aa993b | 1502 | resume (0, TARGET_SIGNAL_0); |
104c1213 JM |
1503 | prepare_to_wait (ecs); |
1504 | return; | |
c5aa993b JM |
1505 | |
1506 | case TARGET_WAITKIND_SPURIOUS: | |
1507 | resume (0, TARGET_SIGNAL_0); | |
104c1213 JM |
1508 | prepare_to_wait (ecs); |
1509 | return; | |
c5aa993b JM |
1510 | |
1511 | case TARGET_WAITKIND_EXITED: | |
1512 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
11cf8741 | 1513 | print_stop_reason (EXITED, ecs->ws.value.integer); |
c5aa993b JM |
1514 | |
1515 | /* Record the exit code in the convenience variable $_exitcode, so | |
1516 | that the user can inspect this again later. */ | |
1517 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1518 | value_from_longest (builtin_type_int, | |
1519 | (LONGEST) ecs->ws.value.integer)); | |
1520 | gdb_flush (gdb_stdout); | |
1521 | target_mourn_inferior (); | |
1522 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P */ | |
1523 | stop_print_frame = 0; | |
104c1213 JM |
1524 | stop_stepping (ecs); |
1525 | return; | |
c5aa993b JM |
1526 | |
1527 | case TARGET_WAITKIND_SIGNALLED: | |
1528 | stop_print_frame = 0; | |
1529 | stop_signal = ecs->ws.value.sig; | |
1530 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b JM |
1531 | |
1532 | /* This looks pretty bogus to me. Doesn't TARGET_WAITKIND_SIGNALLED | |
1533 | mean it is already dead? This has been here since GDB 2.8, so | |
1534 | perhaps it means rms didn't understand unix waitstatuses? | |
1535 | For the moment I'm just kludging around this in remote.c | |
1536 | rather than trying to change it here --kingdon, 5 Dec 1994. */ | |
1537 | target_kill (); /* kill mourns as well */ | |
1538 | ||
11cf8741 | 1539 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
c5aa993b | 1540 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P */ |
104c1213 JM |
1541 | stop_stepping (ecs); |
1542 | return; | |
c5aa993b JM |
1543 | |
1544 | /* The following are the only cases in which we keep going; | |
1545 | the above cases end in a continue or goto. */ | |
1546 | case TARGET_WAITKIND_FORKED: | |
1547 | stop_signal = TARGET_SIGNAL_TRAP; | |
1548 | pending_follow.kind = ecs->ws.kind; | |
1549 | ||
1550 | /* Ignore fork events reported for the parent; we're only | |
1551 | interested in reacting to forks of the child. Note that | |
1552 | we expect the child's fork event to be available if we | |
1553 | waited for it now. */ | |
1554 | if (inferior_pid == ecs->pid) | |
1555 | { | |
1556 | pending_follow.fork_event.saw_parent_fork = 1; | |
1557 | pending_follow.fork_event.parent_pid = ecs->pid; | |
1558 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
104c1213 JM |
1559 | prepare_to_wait (ecs); |
1560 | return; | |
c5aa993b JM |
1561 | } |
1562 | else | |
1563 | { | |
1564 | pending_follow.fork_event.saw_child_fork = 1; | |
1565 | pending_follow.fork_event.child_pid = ecs->pid; | |
1566 | pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid; | |
1567 | } | |
c906108c | 1568 | |
c5aa993b JM |
1569 | stop_pc = read_pc_pid (ecs->pid); |
1570 | ecs->saved_inferior_pid = inferior_pid; | |
1571 | inferior_pid = ecs->pid; | |
6426a772 | 1572 | stop_bpstat = bpstat_stop_status (&stop_pc, currently_stepping (ecs)); |
c5aa993b JM |
1573 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1574 | inferior_pid = ecs->saved_inferior_pid; | |
1575 | goto process_event_stop_test; | |
1576 | ||
1577 | /* If this a platform which doesn't allow a debugger to touch a | |
1578 | vfork'd inferior until after it exec's, then we'd best keep | |
1579 | our fingers entirely off the inferior, other than continuing | |
1580 | it. This has the unfortunate side-effect that catchpoints | |
1581 | of vforks will be ignored. But since the platform doesn't | |
1582 | allow the inferior be touched at vfork time, there's really | |
1583 | little choice. */ | |
1584 | case TARGET_WAITKIND_VFORKED: | |
1585 | stop_signal = TARGET_SIGNAL_TRAP; | |
1586 | pending_follow.kind = ecs->ws.kind; | |
1587 | ||
1588 | /* Is this a vfork of the parent? If so, then give any | |
1589 | vfork catchpoints a chance to trigger now. (It's | |
1590 | dangerous to do so if the child canot be touched until | |
1591 | it execs, and the child has not yet exec'd. We probably | |
1592 | should warn the user to that effect when the catchpoint | |
1593 | triggers...) */ | |
1594 | if (ecs->pid == inferior_pid) | |
1595 | { | |
1596 | pending_follow.fork_event.saw_parent_fork = 1; | |
1597 | pending_follow.fork_event.parent_pid = ecs->pid; | |
1598 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
1599 | } | |
c906108c | 1600 | |
c5aa993b JM |
1601 | /* If we've seen the child's vfork event but cannot really touch |
1602 | the child until it execs, then we must continue the child now. | |
1603 | Else, give any vfork catchpoints a chance to trigger now. */ | |
1604 | else | |
1605 | { | |
1606 | pending_follow.fork_event.saw_child_fork = 1; | |
1607 | pending_follow.fork_event.child_pid = ecs->pid; | |
1608 | pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid; | |
1609 | target_post_startup_inferior (pending_follow.fork_event.child_pid); | |
1610 | follow_vfork_when_exec = !target_can_follow_vfork_prior_to_exec (); | |
1611 | if (follow_vfork_when_exec) | |
1612 | { | |
1613 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1614 | prepare_to_wait (ecs); |
1615 | return; | |
c5aa993b JM |
1616 | } |
1617 | } | |
c906108c | 1618 | |
c5aa993b | 1619 | stop_pc = read_pc (); |
6426a772 | 1620 | stop_bpstat = bpstat_stop_status (&stop_pc, currently_stepping (ecs)); |
c5aa993b JM |
1621 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1622 | goto process_event_stop_test; | |
1623 | ||
1624 | case TARGET_WAITKIND_EXECD: | |
1625 | stop_signal = TARGET_SIGNAL_TRAP; | |
1626 | ||
1627 | /* Is this a target which reports multiple exec events per actual | |
1628 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1629 | ignore all but the last one. Just resume the exec'r, and wait | |
1630 | for the next exec event. */ | |
1631 | if (inferior_ignoring_leading_exec_events) | |
1632 | { | |
1633 | inferior_ignoring_leading_exec_events--; | |
1634 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1635 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.parent_pid); | |
1636 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1637 | prepare_to_wait (ecs); |
1638 | return; | |
c5aa993b JM |
1639 | } |
1640 | inferior_ignoring_leading_exec_events = | |
1641 | target_reported_exec_events_per_exec_call () - 1; | |
c906108c | 1642 | |
96baa820 JM |
1643 | pending_follow.execd_pathname = |
1644 | savestring (ecs->ws.value.execd_pathname, | |
1645 | strlen (ecs->ws.value.execd_pathname)); | |
c906108c | 1646 | |
c5aa993b JM |
1647 | /* Did inferior_pid exec, or did a (possibly not-yet-followed) |
1648 | child of a vfork exec? | |
c906108c | 1649 | |
c5aa993b JM |
1650 | ??rehrauer: This is unabashedly an HP-UX specific thing. On |
1651 | HP-UX, events associated with a vforking inferior come in | |
1652 | threes: a vfork event for the child (always first), followed | |
1653 | a vfork event for the parent and an exec event for the child. | |
1654 | The latter two can come in either order. | |
c906108c | 1655 | |
c5aa993b JM |
1656 | If we get the parent vfork event first, life's good: We follow |
1657 | either the parent or child, and then the child's exec event is | |
1658 | a "don't care". | |
c906108c | 1659 | |
c5aa993b JM |
1660 | But if we get the child's exec event first, then we delay |
1661 | responding to it until we handle the parent's vfork. Because, | |
1662 | otherwise we can't satisfy a "catch vfork". */ | |
1663 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1664 | { | |
1665 | pending_follow.fork_event.saw_child_exec = 1; | |
1666 | ||
1667 | /* On some targets, the child must be resumed before | |
1668 | the parent vfork event is delivered. A single-step | |
1669 | suffices. */ | |
1670 | if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ()) | |
1671 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
1672 | /* We expect the parent vfork event to be available now. */ | |
104c1213 JM |
1673 | prepare_to_wait (ecs); |
1674 | return; | |
c5aa993b | 1675 | } |
c906108c | 1676 | |
c5aa993b JM |
1677 | /* This causes the eventpoints and symbol table to be reset. Must |
1678 | do this now, before trying to determine whether to stop. */ | |
1679 | follow_exec (inferior_pid, pending_follow.execd_pathname); | |
1680 | free (pending_follow.execd_pathname); | |
1681 | ||
1682 | stop_pc = read_pc_pid (ecs->pid); | |
1683 | ecs->saved_inferior_pid = inferior_pid; | |
1684 | inferior_pid = ecs->pid; | |
6426a772 | 1685 | stop_bpstat = bpstat_stop_status (&stop_pc, currently_stepping (ecs)); |
c5aa993b JM |
1686 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1687 | inferior_pid = ecs->saved_inferior_pid; | |
1688 | goto process_event_stop_test; | |
1689 | ||
1690 | /* These syscall events are returned on HP-UX, as part of its | |
1691 | implementation of page-protection-based "hardware" watchpoints. | |
1692 | HP-UX has unfortunate interactions between page-protections and | |
1693 | some system calls. Our solution is to disable hardware watches | |
1694 | when a system call is entered, and reenable them when the syscall | |
1695 | completes. The downside of this is that we may miss the precise | |
1696 | point at which a watched piece of memory is modified. "Oh well." | |
1697 | ||
1698 | Note that we may have multiple threads running, which may each | |
1699 | enter syscalls at roughly the same time. Since we don't have a | |
1700 | good notion currently of whether a watched piece of memory is | |
1701 | thread-private, we'd best not have any page-protections active | |
1702 | when any thread is in a syscall. Thus, we only want to reenable | |
1703 | hardware watches when no threads are in a syscall. | |
1704 | ||
1705 | Also, be careful not to try to gather much state about a thread | |
1706 | that's in a syscall. It's frequently a losing proposition. */ | |
1707 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
1708 | number_of_threads_in_syscalls++; | |
1709 | if (number_of_threads_in_syscalls == 1) | |
1710 | { | |
1711 | TARGET_DISABLE_HW_WATCHPOINTS (inferior_pid); | |
1712 | } | |
1713 | resume (0, TARGET_SIGNAL_0); | |
104c1213 JM |
1714 | prepare_to_wait (ecs); |
1715 | return; | |
c906108c | 1716 | |
c5aa993b | 1717 | /* Before examining the threads further, step this thread to |
c906108c SS |
1718 | get it entirely out of the syscall. (We get notice of the |
1719 | event when the thread is just on the verge of exiting a | |
1720 | syscall. Stepping one instruction seems to get it back | |
1721 | into user code.) | |
1722 | ||
1723 | Note that although the logical place to reenable h/w watches | |
1724 | is here, we cannot. We cannot reenable them before stepping | |
1725 | the thread (this causes the next wait on the thread to hang). | |
1726 | ||
1727 | Nor can we enable them after stepping until we've done a wait. | |
cd0fc7c3 | 1728 | Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait |
c906108c SS |
1729 | here, which will be serviced immediately after the target |
1730 | is waited on. */ | |
c5aa993b JM |
1731 | case TARGET_WAITKIND_SYSCALL_RETURN: |
1732 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
c906108c | 1733 | |
c5aa993b JM |
1734 | if (number_of_threads_in_syscalls > 0) |
1735 | { | |
1736 | number_of_threads_in_syscalls--; | |
1737 | ecs->enable_hw_watchpoints_after_wait = | |
1738 | (number_of_threads_in_syscalls == 0); | |
1739 | } | |
104c1213 JM |
1740 | prepare_to_wait (ecs); |
1741 | return; | |
c906108c | 1742 | |
c5aa993b JM |
1743 | case TARGET_WAITKIND_STOPPED: |
1744 | stop_signal = ecs->ws.value.sig; | |
1745 | break; | |
c4093a6a JM |
1746 | |
1747 | /* We had an event in the inferior, but we are not interested | |
1748 | in handling it at this level. The lower layers have already | |
1749 | done what needs to be done, if anything. This case can | |
1750 | occur only when the target is async or extended-async. One | |
1751 | of the circumstamces for this to happen is when the | |
1752 | inferior produces output for the console. The inferior has | |
1753 | not stopped, and we are ignoring the event. */ | |
1754 | case TARGET_WAITKIND_IGNORE: | |
1755 | ecs->wait_some_more = 1; | |
1756 | return; | |
c5aa993b | 1757 | } |
c906108c | 1758 | |
c5aa993b JM |
1759 | /* We may want to consider not doing a resume here in order to give |
1760 | the user a chance to play with the new thread. It might be good | |
1761 | to make that a user-settable option. */ | |
c906108c | 1762 | |
c5aa993b JM |
1763 | /* At this point, all threads are stopped (happens automatically in |
1764 | either the OS or the native code). Therefore we need to continue | |
1765 | all threads in order to make progress. */ | |
1766 | if (ecs->new_thread_event) | |
1767 | { | |
1768 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1769 | prepare_to_wait (ecs); |
1770 | return; | |
c5aa993b | 1771 | } |
c906108c | 1772 | |
c5aa993b | 1773 | stop_pc = read_pc_pid (ecs->pid); |
c906108c | 1774 | |
c5aa993b JM |
1775 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1776 | another thread. If so, then step that thread past the breakpoint, | |
1777 | and continue it. */ | |
c906108c | 1778 | |
c5aa993b JM |
1779 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1780 | { | |
1781 | if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p) | |
1782 | ecs->random_signal = 0; | |
1783 | else if (breakpoints_inserted | |
1784 | && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK)) | |
1785 | { | |
cd0fc7c3 | 1786 | ecs->random_signal = 0; |
c5aa993b JM |
1787 | if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, |
1788 | ecs->pid)) | |
1789 | { | |
1790 | int remove_status; | |
1791 | ||
1792 | /* Saw a breakpoint, but it was hit by the wrong thread. | |
1793 | Just continue. */ | |
1794 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, ecs->pid); | |
1795 | ||
1796 | remove_status = remove_breakpoints (); | |
1797 | /* Did we fail to remove breakpoints? If so, try | |
1798 | to set the PC past the bp. (There's at least | |
1799 | one situation in which we can fail to remove | |
1800 | the bp's: On HP-UX's that use ttrace, we can't | |
1801 | change the address space of a vforking child | |
1802 | process until the child exits (well, okay, not | |
1803 | then either :-) or execs. */ | |
1804 | if (remove_status != 0) | |
1805 | { | |
1806 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, ecs->pid); | |
1807 | } | |
1808 | else | |
1809 | { /* Single step */ | |
1810 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
1811 | /* FIXME: What if a signal arrives instead of the | |
1812 | single-step happening? */ | |
1813 | ||
1814 | ecs->waiton_pid = ecs->pid; | |
1815 | ecs->wp = &(ecs->ws); | |
1816 | ecs->infwait_state = infwait_thread_hop_state; | |
104c1213 JM |
1817 | prepare_to_wait (ecs); |
1818 | return; | |
c5aa993b | 1819 | } |
c906108c | 1820 | |
c5aa993b JM |
1821 | /* We need to restart all the threads now, |
1822 | * unles we're running in scheduler-locked mode. | |
1823 | * FIXME: shouldn't we look at currently_stepping ()? | |
1824 | */ | |
1825 | if (scheduler_mode == schedlock_on) | |
1826 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
1827 | else | |
1828 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1829 | prepare_to_wait (ecs); |
1830 | return; | |
c5aa993b JM |
1831 | } |
1832 | else | |
1833 | { | |
1834 | /* This breakpoint matches--either it is the right | |
1835 | thread or it's a generic breakpoint for all threads. | |
1836 | Remember that we'll need to step just _this_ thread | |
1837 | on any following user continuation! */ | |
1838 | thread_step_needed = 1; | |
1839 | } | |
1840 | } | |
1841 | } | |
1842 | else | |
1843 | ecs->random_signal = 1; | |
1844 | ||
1845 | /* See if something interesting happened to the non-current thread. If | |
1846 | so, then switch to that thread, and eventually give control back to | |
1847 | the user. | |
1848 | ||
1849 | Note that if there's any kind of pending follow (i.e., of a fork, | |
1850 | vfork or exec), we don't want to do this now. Rather, we'll let | |
1851 | the next resume handle it. */ | |
1852 | if ((ecs->pid != inferior_pid) && | |
1853 | (pending_follow.kind == TARGET_WAITKIND_SPURIOUS)) | |
1854 | { | |
1855 | int printed = 0; | |
c906108c | 1856 | |
c5aa993b JM |
1857 | /* If it's a random signal for a non-current thread, notify user |
1858 | if he's expressed an interest. */ | |
1859 | if (ecs->random_signal | |
1860 | && signal_print[stop_signal]) | |
1861 | { | |
c906108c SS |
1862 | /* ??rehrauer: I don't understand the rationale for this code. If the |
1863 | inferior will stop as a result of this signal, then the act of handling | |
1864 | the stop ought to print a message that's couches the stoppage in user | |
1865 | terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior | |
1866 | won't stop as a result of the signal -- i.e., if the signal is merely | |
1867 | a side-effect of something GDB's doing "under the covers" for the | |
1868 | user, such as stepping threads over a breakpoint they shouldn't stop | |
1869 | for -- then the message seems to be a serious annoyance at best. | |
1870 | ||
1871 | For now, remove the message altogether. */ | |
1872 | #if 0 | |
c5aa993b JM |
1873 | printed = 1; |
1874 | target_terminal_ours_for_output (); | |
1875 | printf_filtered ("\nProgram received signal %s, %s.\n", | |
1876 | target_signal_to_name (stop_signal), | |
1877 | target_signal_to_string (stop_signal)); | |
1878 | gdb_flush (gdb_stdout); | |
c906108c | 1879 | #endif |
c5aa993b | 1880 | } |
c906108c | 1881 | |
c5aa993b JM |
1882 | /* If it's not SIGTRAP and not a signal we want to stop for, then |
1883 | continue the thread. */ | |
c906108c | 1884 | |
c5aa993b JM |
1885 | if (stop_signal != TARGET_SIGNAL_TRAP |
1886 | && !signal_stop[stop_signal]) | |
1887 | { | |
1888 | if (printed) | |
1889 | target_terminal_inferior (); | |
c906108c | 1890 | |
c5aa993b JM |
1891 | /* Clear the signal if it should not be passed. */ |
1892 | if (signal_program[stop_signal] == 0) | |
1893 | stop_signal = TARGET_SIGNAL_0; | |
c906108c | 1894 | |
c5aa993b | 1895 | target_resume (ecs->pid, 0, stop_signal); |
104c1213 JM |
1896 | prepare_to_wait (ecs); |
1897 | return; | |
c5aa993b | 1898 | } |
c906108c | 1899 | |
c5aa993b JM |
1900 | /* It's a SIGTRAP or a signal we're interested in. Switch threads, |
1901 | and fall into the rest of wait_for_inferior(). */ | |
1902 | ||
c2d11a7d JM |
1903 | /* Caution: it may happen that the new thread (or the old one!) |
1904 | is not in the thread list. In this case we must not attempt | |
1905 | to "switch context", or we run the risk that our context may | |
1906 | be lost. This may happen as a result of the target module | |
1907 | mishandling thread creation. */ | |
1908 | ||
1909 | if (in_thread_list (inferior_pid) && in_thread_list (ecs->pid)) | |
1910 | { /* Perform infrun state context switch: */ | |
1911 | /* Save infrun state for the old thread. */ | |
1912 | save_infrun_state (inferior_pid, prev_pc, | |
1913 | prev_func_start, prev_func_name, | |
1914 | trap_expected, step_resume_breakpoint, | |
1915 | through_sigtramp_breakpoint, | |
1916 | step_range_start, step_range_end, | |
1917 | step_frame_address, ecs->handling_longjmp, | |
1918 | ecs->another_trap, | |
1919 | ecs->stepping_through_solib_after_catch, | |
1920 | ecs->stepping_through_solib_catchpoints, | |
1921 | ecs->stepping_through_sigtramp); | |
1922 | ||
1923 | /* Load infrun state for the new thread. */ | |
1924 | load_infrun_state (ecs->pid, &prev_pc, | |
1925 | &prev_func_start, &prev_func_name, | |
1926 | &trap_expected, &step_resume_breakpoint, | |
1927 | &through_sigtramp_breakpoint, | |
1928 | &step_range_start, &step_range_end, | |
1929 | &step_frame_address, &ecs->handling_longjmp, | |
1930 | &ecs->another_trap, | |
1931 | &ecs->stepping_through_solib_after_catch, | |
1932 | &ecs->stepping_through_solib_catchpoints, | |
1933 | &ecs->stepping_through_sigtramp); | |
1934 | } | |
c5aa993b JM |
1935 | |
1936 | inferior_pid = ecs->pid; | |
1937 | ||
c5aa993b JM |
1938 | if (context_hook) |
1939 | context_hook (pid_to_thread_id (ecs->pid)); | |
1940 | ||
c5aa993b JM |
1941 | flush_cached_frames (); |
1942 | } | |
c906108c | 1943 | |
c5aa993b JM |
1944 | if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p) |
1945 | { | |
1946 | /* Pull the single step breakpoints out of the target. */ | |
1947 | SOFTWARE_SINGLE_STEP (0, 0); | |
1948 | singlestep_breakpoints_inserted_p = 0; | |
1949 | } | |
c906108c | 1950 | |
c5aa993b JM |
1951 | /* If PC is pointing at a nullified instruction, then step beyond |
1952 | it so that the user won't be confused when GDB appears to be ready | |
1953 | to execute it. */ | |
c906108c | 1954 | |
c5aa993b JM |
1955 | /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */ |
1956 | if (INSTRUCTION_NULLIFIED) | |
1957 | { | |
1958 | registers_changed (); | |
1959 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
c906108c | 1960 | |
c5aa993b JM |
1961 | /* We may have received a signal that we want to pass to |
1962 | the inferior; therefore, we must not clobber the waitstatus | |
1963 | in WS. */ | |
c906108c | 1964 | |
c5aa993b JM |
1965 | ecs->infwait_state = infwait_nullified_state; |
1966 | ecs->waiton_pid = ecs->pid; | |
1967 | ecs->wp = &(ecs->tmpstatus); | |
104c1213 JM |
1968 | prepare_to_wait (ecs); |
1969 | return; | |
c5aa993b | 1970 | } |
c906108c | 1971 | |
c5aa993b JM |
1972 | /* It may not be necessary to disable the watchpoint to stop over |
1973 | it. For example, the PA can (with some kernel cooperation) | |
1974 | single step over a watchpoint without disabling the watchpoint. */ | |
1975 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1976 | { | |
1977 | resume (1, 0); | |
104c1213 JM |
1978 | prepare_to_wait (ecs); |
1979 | return; | |
c5aa993b | 1980 | } |
c906108c | 1981 | |
c5aa993b JM |
1982 | /* It is far more common to need to disable a watchpoint to step |
1983 | the inferior over it. FIXME. What else might a debug | |
1984 | register or page protection watchpoint scheme need here? */ | |
1985 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1986 | { | |
1987 | /* At this point, we are stopped at an instruction which has | |
1988 | attempted to write to a piece of memory under control of | |
1989 | a watchpoint. The instruction hasn't actually executed | |
1990 | yet. If we were to evaluate the watchpoint expression | |
1991 | now, we would get the old value, and therefore no change | |
1992 | would seem to have occurred. | |
1993 | ||
1994 | In order to make watchpoints work `right', we really need | |
1995 | to complete the memory write, and then evaluate the | |
1996 | watchpoint expression. The following code does that by | |
1997 | removing the watchpoint (actually, all watchpoints and | |
1998 | breakpoints), single-stepping the target, re-inserting | |
1999 | watchpoints, and then falling through to let normal | |
2000 | single-step processing handle proceed. Since this | |
2001 | includes evaluating watchpoints, things will come to a | |
2002 | stop in the correct manner. */ | |
2003 | ||
2004 | write_pc (stop_pc - DECR_PC_AFTER_BREAK); | |
2005 | ||
2006 | remove_breakpoints (); | |
2007 | registers_changed (); | |
2008 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); /* Single step */ | |
2009 | ||
2010 | ecs->waiton_pid = ecs->pid; | |
2011 | ecs->wp = &(ecs->ws); | |
2012 | ecs->infwait_state = infwait_nonstep_watch_state; | |
104c1213 JM |
2013 | prepare_to_wait (ecs); |
2014 | return; | |
c5aa993b | 2015 | } |
c906108c | 2016 | |
c5aa993b JM |
2017 | /* It may be possible to simply continue after a watchpoint. */ |
2018 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
2019 | STOPPED_BY_WATCHPOINT (ecs->ws); | |
2020 | ||
2021 | ecs->stop_func_start = 0; | |
2022 | ecs->stop_func_end = 0; | |
2023 | ecs->stop_func_name = 0; | |
2024 | /* Don't care about return value; stop_func_start and stop_func_name | |
2025 | will both be 0 if it doesn't work. */ | |
2026 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
2027 | &ecs->stop_func_start, &ecs->stop_func_end); | |
2028 | ecs->stop_func_start += FUNCTION_START_OFFSET; | |
2029 | ecs->another_trap = 0; | |
2030 | bpstat_clear (&stop_bpstat); | |
2031 | stop_step = 0; | |
2032 | stop_stack_dummy = 0; | |
2033 | stop_print_frame = 1; | |
2034 | ecs->random_signal = 0; | |
2035 | stopped_by_random_signal = 0; | |
2036 | breakpoints_failed = 0; | |
2037 | ||
2038 | /* Look at the cause of the stop, and decide what to do. | |
2039 | The alternatives are: | |
2040 | 1) break; to really stop and return to the debugger, | |
2041 | 2) drop through to start up again | |
2042 | (set ecs->another_trap to 1 to single step once) | |
2043 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
2044 | will be made according to the signal handling tables. */ | |
2045 | ||
2046 | /* First, distinguish signals caused by the debugger from signals | |
2047 | that have to do with the program's own actions. | |
2048 | Note that breakpoint insns may cause SIGTRAP or SIGILL | |
2049 | or SIGEMT, depending on the operating system version. | |
2050 | Here we detect when a SIGILL or SIGEMT is really a breakpoint | |
2051 | and change it to SIGTRAP. */ | |
2052 | ||
2053 | if (stop_signal == TARGET_SIGNAL_TRAP | |
2054 | || (breakpoints_inserted && | |
2055 | (stop_signal == TARGET_SIGNAL_ILL | |
2056 | || stop_signal == TARGET_SIGNAL_EMT | |
2057 | )) | |
2058 | || stop_soon_quietly) | |
2059 | { | |
2060 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
2061 | { | |
2062 | stop_print_frame = 0; | |
104c1213 JM |
2063 | stop_stepping (ecs); |
2064 | return; | |
c5aa993b JM |
2065 | } |
2066 | if (stop_soon_quietly) | |
104c1213 JM |
2067 | { |
2068 | stop_stepping (ecs); | |
2069 | return; | |
2070 | } | |
c906108c | 2071 | |
c5aa993b JM |
2072 | /* Don't even think about breakpoints |
2073 | if just proceeded over a breakpoint. | |
c906108c | 2074 | |
c5aa993b JM |
2075 | However, if we are trying to proceed over a breakpoint |
2076 | and end up in sigtramp, then through_sigtramp_breakpoint | |
2077 | will be set and we should check whether we've hit the | |
2078 | step breakpoint. */ | |
2079 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected | |
2080 | && through_sigtramp_breakpoint == NULL) | |
2081 | bpstat_clear (&stop_bpstat); | |
2082 | else | |
2083 | { | |
2084 | /* See if there is a breakpoint at the current PC. */ | |
2085 | stop_bpstat = bpstat_stop_status | |
2086 | (&stop_pc, | |
6426a772 JM |
2087 | /* Pass TRUE if our reason for stopping is something other |
2088 | than hitting a breakpoint. We do this by checking that | |
2089 | 1) stepping is going on and 2) we didn't hit a breakpoint | |
2090 | in a signal handler without an intervening stop in | |
2091 | sigtramp, which is detected by a new stack pointer value | |
2092 | below any usual function calling stack adjustments. */ | |
c5aa993b | 2093 | (currently_stepping (ecs) |
c5aa993b | 2094 | && !(step_range_end |
6426a772 | 2095 | && INNER_THAN (read_sp (), (step_sp - 16)))) |
c5aa993b JM |
2096 | ); |
2097 | /* Following in case break condition called a | |
2098 | function. */ | |
2099 | stop_print_frame = 1; | |
2100 | } | |
c906108c | 2101 | |
c5aa993b JM |
2102 | if (stop_signal == TARGET_SIGNAL_TRAP) |
2103 | ecs->random_signal | |
2104 | = !(bpstat_explains_signal (stop_bpstat) | |
2105 | || trap_expected | |
2106 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P | |
2107 | && PC_IN_CALL_DUMMY (stop_pc, read_sp (), | |
2108 | FRAME_FP (get_current_frame ()))) | |
2109 | || (step_range_end && step_resume_breakpoint == NULL)); | |
2110 | ||
2111 | else | |
2112 | { | |
cd0fc7c3 | 2113 | ecs->random_signal |
c906108c | 2114 | = !(bpstat_explains_signal (stop_bpstat) |
c5aa993b JM |
2115 | /* End of a stack dummy. Some systems (e.g. Sony |
2116 | news) give another signal besides SIGTRAP, so | |
2117 | check here as well as above. */ | |
7a292a7a SS |
2118 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P |
2119 | && PC_IN_CALL_DUMMY (stop_pc, read_sp (), | |
2120 | FRAME_FP (get_current_frame ()))) | |
c5aa993b JM |
2121 | ); |
2122 | if (!ecs->random_signal) | |
2123 | stop_signal = TARGET_SIGNAL_TRAP; | |
2124 | } | |
2125 | } | |
c906108c | 2126 | |
c5aa993b JM |
2127 | /* When we reach this point, we've pretty much decided |
2128 | that the reason for stopping must've been a random | |
2129 | (unexpected) signal. */ | |
2130 | ||
2131 | else | |
2132 | ecs->random_signal = 1; | |
2133 | /* If a fork, vfork or exec event was seen, then there are two | |
2134 | possible responses we can make: | |
2135 | ||
2136 | 1. If a catchpoint triggers for the event (ecs->random_signal == 0), | |
2137 | then we must stop now and issue a prompt. We will resume | |
2138 | the inferior when the user tells us to. | |
2139 | 2. If no catchpoint triggers for the event (ecs->random_signal == 1), | |
2140 | then we must resume the inferior now and keep checking. | |
2141 | ||
2142 | In either case, we must take appropriate steps to "follow" the | |
2143 | the fork/vfork/exec when the inferior is resumed. For example, | |
2144 | if follow-fork-mode is "child", then we must detach from the | |
2145 | parent inferior and follow the new child inferior. | |
2146 | ||
2147 | In either case, setting pending_follow causes the next resume() | |
2148 | to take the appropriate following action. */ | |
2149 | process_event_stop_test: | |
2150 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
2151 | { | |
2152 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
2153 | { | |
2154 | trap_expected = 1; | |
2155 | stop_signal = TARGET_SIGNAL_0; | |
d4f3574e SS |
2156 | keep_going (ecs); |
2157 | return; | |
c5aa993b JM |
2158 | } |
2159 | } | |
2160 | else if (ecs->ws.kind == TARGET_WAITKIND_VFORKED) | |
2161 | { | |
2162 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
2163 | { | |
d4f3574e SS |
2164 | stop_signal = TARGET_SIGNAL_0; |
2165 | keep_going (ecs); | |
2166 | return; | |
c5aa993b JM |
2167 | } |
2168 | } | |
2169 | else if (ecs->ws.kind == TARGET_WAITKIND_EXECD) | |
2170 | { | |
2171 | pending_follow.kind = ecs->ws.kind; | |
2172 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
2173 | { | |
2174 | trap_expected = 1; | |
2175 | stop_signal = TARGET_SIGNAL_0; | |
d4f3574e SS |
2176 | keep_going (ecs); |
2177 | return; | |
c5aa993b JM |
2178 | } |
2179 | } | |
c906108c | 2180 | |
c5aa993b JM |
2181 | /* For the program's own signals, act according to |
2182 | the signal handling tables. */ | |
c906108c | 2183 | |
c5aa993b JM |
2184 | if (ecs->random_signal) |
2185 | { | |
2186 | /* Signal not for debugging purposes. */ | |
2187 | int printed = 0; | |
2188 | ||
2189 | stopped_by_random_signal = 1; | |
2190 | ||
2191 | if (signal_print[stop_signal]) | |
2192 | { | |
2193 | printed = 1; | |
2194 | target_terminal_ours_for_output (); | |
11cf8741 | 2195 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); |
c5aa993b JM |
2196 | } |
2197 | if (signal_stop[stop_signal]) | |
104c1213 JM |
2198 | { |
2199 | stop_stepping (ecs); | |
2200 | return; | |
2201 | } | |
c5aa993b JM |
2202 | /* If not going to stop, give terminal back |
2203 | if we took it away. */ | |
2204 | else if (printed) | |
2205 | target_terminal_inferior (); | |
2206 | ||
2207 | /* Clear the signal if it should not be passed. */ | |
2208 | if (signal_program[stop_signal] == 0) | |
2209 | stop_signal = TARGET_SIGNAL_0; | |
2210 | ||
a0b3c4fd JM |
2211 | /* I'm not sure whether this needs to be check_sigtramp2 or |
2212 | whether it could/should be keep_going. | |
2213 | ||
2214 | This used to jump to step_over_function if we are stepping, | |
2215 | which is wrong. | |
2216 | ||
2217 | Suppose the user does a `next' over a function call, and while | |
2218 | that call is in progress, the inferior receives a signal for | |
2219 | which GDB does not stop (i.e., signal_stop[SIG] is false). In | |
2220 | that case, when we reach this point, there is already a | |
2221 | step-resume breakpoint established, right where it should be: | |
2222 | immediately after the function call the user is "next"-ing | |
d4f3574e | 2223 | over. If we call step_over_function now, two bad things |
a0b3c4fd JM |
2224 | happen: |
2225 | ||
2226 | - we'll create a new breakpoint, at wherever the current | |
2227 | frame's return address happens to be. That could be | |
2228 | anywhere, depending on what function call happens to be on | |
2229 | the top of the stack at that point. Point is, it's probably | |
2230 | not where we need it. | |
2231 | ||
2232 | - the existing step-resume breakpoint (which is at the correct | |
2233 | address) will get orphaned: step_resume_breakpoint will point | |
2234 | to the new breakpoint, and the old step-resume breakpoint | |
2235 | will never be cleaned up. | |
2236 | ||
2237 | The old behavior was meant to help HP-UX single-step out of | |
2238 | sigtramps. It would place the new breakpoint at prev_pc, which | |
2239 | was certainly wrong. I don't know the details there, so fixing | |
2240 | this probably breaks that. As with anything else, it's up to | |
2241 | the HP-UX maintainer to furnish a fix that doesn't break other | |
2242 | platforms. --JimB, 20 May 1999 */ | |
104c1213 | 2243 | check_sigtramp2 (ecs); |
c5aa993b JM |
2244 | } |
2245 | ||
2246 | /* Handle cases caused by hitting a breakpoint. */ | |
2247 | { | |
2248 | CORE_ADDR jmp_buf_pc; | |
2249 | struct bpstat_what what; | |
2250 | ||
2251 | what = bpstat_what (stop_bpstat); | |
2252 | ||
2253 | if (what.call_dummy) | |
c906108c | 2254 | { |
c5aa993b JM |
2255 | stop_stack_dummy = 1; |
2256 | #ifdef HP_OS_BUG | |
2257 | trap_expected_after_continue = 1; | |
2258 | #endif | |
c906108c | 2259 | } |
c5aa993b JM |
2260 | |
2261 | switch (what.main_action) | |
c906108c | 2262 | { |
c5aa993b JM |
2263 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2264 | /* If we hit the breakpoint at longjmp, disable it for the | |
2265 | duration of this command. Then, install a temporary | |
2266 | breakpoint at the target of the jmp_buf. */ | |
2267 | disable_longjmp_breakpoint (); | |
2268 | remove_breakpoints (); | |
2269 | breakpoints_inserted = 0; | |
2270 | if (!GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
d4f3574e SS |
2271 | { |
2272 | keep_going (ecs); | |
2273 | return; | |
2274 | } | |
c5aa993b JM |
2275 | |
2276 | /* Need to blow away step-resume breakpoint, as it | |
2277 | interferes with us */ | |
2278 | if (step_resume_breakpoint != NULL) | |
c906108c | 2279 | { |
c5aa993b JM |
2280 | delete_breakpoint (step_resume_breakpoint); |
2281 | step_resume_breakpoint = NULL; | |
c906108c | 2282 | } |
c5aa993b JM |
2283 | /* Not sure whether we need to blow this away too, but probably |
2284 | it is like the step-resume breakpoint. */ | |
2285 | if (through_sigtramp_breakpoint != NULL) | |
c906108c | 2286 | { |
c5aa993b JM |
2287 | delete_breakpoint (through_sigtramp_breakpoint); |
2288 | through_sigtramp_breakpoint = NULL; | |
c906108c | 2289 | } |
c906108c | 2290 | |
c5aa993b JM |
2291 | #if 0 |
2292 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2293 | if (step_over_calls > 0) | |
2294 | set_longjmp_resume_breakpoint (jmp_buf_pc, | |
2295 | get_current_frame ()); | |
2296 | else | |
2297 | #endif /* 0 */ | |
2298 | set_longjmp_resume_breakpoint (jmp_buf_pc, NULL); | |
2299 | ecs->handling_longjmp = 1; /* FIXME */ | |
d4f3574e SS |
2300 | keep_going (ecs); |
2301 | return; | |
c906108c | 2302 | |
c5aa993b JM |
2303 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2304 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
2305 | remove_breakpoints (); | |
2306 | breakpoints_inserted = 0; | |
2307 | #if 0 | |
2308 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2309 | if (step_over_calls | |
2310 | && (INNER_THAN (FRAME_FP (get_current_frame ()), | |
2311 | step_frame_address))) | |
2312 | { | |
2313 | ecs->another_trap = 1; | |
d4f3574e SS |
2314 | keep_going (ecs); |
2315 | return; | |
c5aa993b JM |
2316 | } |
2317 | #endif /* 0 */ | |
2318 | disable_longjmp_breakpoint (); | |
2319 | ecs->handling_longjmp = 0; /* FIXME */ | |
2320 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2321 | break; | |
2322 | /* else fallthrough */ | |
c906108c | 2323 | |
c5aa993b JM |
2324 | case BPSTAT_WHAT_SINGLE: |
2325 | if (breakpoints_inserted) | |
c906108c | 2326 | { |
c5aa993b JM |
2327 | thread_step_needed = 1; |
2328 | remove_breakpoints (); | |
c906108c | 2329 | } |
c5aa993b JM |
2330 | breakpoints_inserted = 0; |
2331 | ecs->another_trap = 1; | |
2332 | /* Still need to check other stuff, at least the case | |
2333 | where we are stepping and step out of the right range. */ | |
2334 | break; | |
c906108c | 2335 | |
c5aa993b JM |
2336 | case BPSTAT_WHAT_STOP_NOISY: |
2337 | stop_print_frame = 1; | |
c906108c | 2338 | |
c5aa993b JM |
2339 | /* We are about to nuke the step_resume_breakpoint and |
2340 | through_sigtramp_breakpoint via the cleanup chain, so | |
2341 | no need to worry about it here. */ | |
c906108c | 2342 | |
104c1213 JM |
2343 | stop_stepping (ecs); |
2344 | return; | |
c906108c | 2345 | |
c5aa993b JM |
2346 | case BPSTAT_WHAT_STOP_SILENT: |
2347 | stop_print_frame = 0; | |
c906108c | 2348 | |
c5aa993b JM |
2349 | /* We are about to nuke the step_resume_breakpoint and |
2350 | through_sigtramp_breakpoint via the cleanup chain, so | |
2351 | no need to worry about it here. */ | |
c906108c | 2352 | |
104c1213 JM |
2353 | stop_stepping (ecs); |
2354 | return; | |
c906108c | 2355 | |
c5aa993b JM |
2356 | case BPSTAT_WHAT_STEP_RESUME: |
2357 | /* This proably demands a more elegant solution, but, yeah | |
2358 | right... | |
2359 | ||
2360 | This function's use of the simple variable | |
2361 | step_resume_breakpoint doesn't seem to accomodate | |
2362 | simultaneously active step-resume bp's, although the | |
2363 | breakpoint list certainly can. | |
2364 | ||
2365 | If we reach here and step_resume_breakpoint is already | |
2366 | NULL, then apparently we have multiple active | |
2367 | step-resume bp's. We'll just delete the breakpoint we | |
53a5351d JM |
2368 | stopped at, and carry on. |
2369 | ||
2370 | Correction: what the code currently does is delete a | |
2371 | step-resume bp, but it makes no effort to ensure that | |
2372 | the one deleted is the one currently stopped at. MVS */ | |
2373 | ||
c5aa993b JM |
2374 | if (step_resume_breakpoint == NULL) |
2375 | { | |
2376 | step_resume_breakpoint = | |
2377 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2378 | } | |
2379 | delete_breakpoint (step_resume_breakpoint); | |
2380 | step_resume_breakpoint = NULL; | |
2381 | break; | |
2382 | ||
2383 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
2384 | if (through_sigtramp_breakpoint) | |
2385 | delete_breakpoint (through_sigtramp_breakpoint); | |
2386 | through_sigtramp_breakpoint = NULL; | |
2387 | ||
2388 | /* If were waiting for a trap, hitting the step_resume_break | |
2389 | doesn't count as getting it. */ | |
2390 | if (trap_expected) | |
2391 | ecs->another_trap = 1; | |
2392 | break; | |
c906108c | 2393 | |
c5aa993b JM |
2394 | case BPSTAT_WHAT_CHECK_SHLIBS: |
2395 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2396 | #ifdef SOLIB_ADD | |
c906108c | 2397 | { |
c5aa993b JM |
2398 | /* Remove breakpoints, we eventually want to step over the |
2399 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2400 | breakpoint addresses via breakpoint_re_set. */ | |
2401 | if (breakpoints_inserted) | |
2402 | remove_breakpoints (); | |
c906108c | 2403 | breakpoints_inserted = 0; |
c906108c | 2404 | |
c5aa993b JM |
2405 | /* Check for any newly added shared libraries if we're |
2406 | supposed to be adding them automatically. */ | |
2407 | if (auto_solib_add) | |
c906108c | 2408 | { |
c5aa993b JM |
2409 | /* Switch terminal for any messages produced by |
2410 | breakpoint_re_set. */ | |
2411 | target_terminal_ours_for_output (); | |
2412 | SOLIB_ADD (NULL, 0, NULL); | |
2413 | target_terminal_inferior (); | |
c906108c | 2414 | } |
c5aa993b JM |
2415 | |
2416 | /* Try to reenable shared library breakpoints, additional | |
2417 | code segments in shared libraries might be mapped in now. */ | |
2418 | re_enable_breakpoints_in_shlibs (); | |
2419 | ||
2420 | /* If requested, stop when the dynamic linker notifies | |
2421 | gdb of events. This allows the user to get control | |
2422 | and place breakpoints in initializer routines for | |
2423 | dynamically loaded objects (among other things). */ | |
2424 | if (stop_on_solib_events) | |
c906108c | 2425 | { |
104c1213 JM |
2426 | stop_stepping (ecs); |
2427 | return; | |
c906108c SS |
2428 | } |
2429 | ||
c5aa993b JM |
2430 | /* If we stopped due to an explicit catchpoint, then the |
2431 | (see above) call to SOLIB_ADD pulled in any symbols | |
2432 | from a newly-loaded library, if appropriate. | |
2433 | ||
2434 | We do want the inferior to stop, but not where it is | |
2435 | now, which is in the dynamic linker callback. Rather, | |
2436 | we would like it stop in the user's program, just after | |
2437 | the call that caused this catchpoint to trigger. That | |
2438 | gives the user a more useful vantage from which to | |
2439 | examine their program's state. */ | |
2440 | else if (what.main_action == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
2441 | { | |
2442 | /* ??rehrauer: If I could figure out how to get the | |
2443 | right return PC from here, we could just set a temp | |
2444 | breakpoint and resume. I'm not sure we can without | |
2445 | cracking open the dld's shared libraries and sniffing | |
2446 | their unwind tables and text/data ranges, and that's | |
2447 | not a terribly portable notion. | |
2448 | ||
2449 | Until that time, we must step the inferior out of the | |
2450 | dld callback, and also out of the dld itself (and any | |
2451 | code or stubs in libdld.sl, such as "shl_load" and | |
2452 | friends) until we reach non-dld code. At that point, | |
2453 | we can stop stepping. */ | |
2454 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2455 | &ecs->stepping_through_solib_catchpoints); | |
2456 | ecs->stepping_through_solib_after_catch = 1; | |
2457 | ||
2458 | /* Be sure to lift all breakpoints, so the inferior does | |
2459 | actually step past this point... */ | |
2460 | ecs->another_trap = 1; | |
2461 | break; | |
2462 | } | |
2463 | else | |
c906108c | 2464 | { |
c5aa993b | 2465 | /* We want to step over this breakpoint, then keep going. */ |
cd0fc7c3 | 2466 | ecs->another_trap = 1; |
c5aa993b | 2467 | break; |
c906108c | 2468 | } |
c5aa993b JM |
2469 | } |
2470 | #endif | |
2471 | break; | |
c906108c | 2472 | |
c5aa993b JM |
2473 | case BPSTAT_WHAT_LAST: |
2474 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2475 | |
c5aa993b JM |
2476 | case BPSTAT_WHAT_KEEP_CHECKING: |
2477 | break; | |
2478 | } | |
2479 | } | |
c906108c | 2480 | |
c5aa993b JM |
2481 | /* We come here if we hit a breakpoint but should not |
2482 | stop for it. Possibly we also were stepping | |
2483 | and should stop for that. So fall through and | |
2484 | test for stepping. But, if not stepping, | |
2485 | do not stop. */ | |
c906108c | 2486 | |
c5aa993b JM |
2487 | /* Are we stepping to get the inferior out of the dynamic |
2488 | linker's hook (and possibly the dld itself) after catching | |
2489 | a shlib event? */ | |
2490 | if (ecs->stepping_through_solib_after_catch) | |
2491 | { | |
2492 | #if defined(SOLIB_ADD) | |
2493 | /* Have we reached our destination? If not, keep going. */ | |
2494 | if (SOLIB_IN_DYNAMIC_LINKER (ecs->pid, stop_pc)) | |
2495 | { | |
2496 | ecs->another_trap = 1; | |
d4f3574e SS |
2497 | keep_going (ecs); |
2498 | return; | |
c5aa993b JM |
2499 | } |
2500 | #endif | |
2501 | /* Else, stop and report the catchpoint(s) whose triggering | |
2502 | caused us to begin stepping. */ | |
2503 | ecs->stepping_through_solib_after_catch = 0; | |
2504 | bpstat_clear (&stop_bpstat); | |
2505 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2506 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2507 | stop_print_frame = 1; | |
104c1213 JM |
2508 | stop_stepping (ecs); |
2509 | return; | |
c5aa993b | 2510 | } |
c906108c | 2511 | |
c5aa993b JM |
2512 | if (!CALL_DUMMY_BREAKPOINT_OFFSET_P) |
2513 | { | |
2514 | /* This is the old way of detecting the end of the stack dummy. | |
2515 | An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets | |
2516 | handled above. As soon as we can test it on all of them, all | |
2517 | architectures should define it. */ | |
2518 | ||
2519 | /* If this is the breakpoint at the end of a stack dummy, | |
2520 | just stop silently, unless the user was doing an si/ni, in which | |
2521 | case she'd better know what she's doing. */ | |
2522 | ||
2523 | if (CALL_DUMMY_HAS_COMPLETED (stop_pc, read_sp (), | |
2524 | FRAME_FP (get_current_frame ())) | |
2525 | && !step_range_end) | |
2526 | { | |
c906108c | 2527 | stop_print_frame = 0; |
c5aa993b JM |
2528 | stop_stack_dummy = 1; |
2529 | #ifdef HP_OS_BUG | |
2530 | trap_expected_after_continue = 1; | |
2531 | #endif | |
104c1213 JM |
2532 | stop_stepping (ecs); |
2533 | return; | |
c5aa993b JM |
2534 | } |
2535 | } | |
c906108c | 2536 | |
c5aa993b | 2537 | if (step_resume_breakpoint) |
104c1213 JM |
2538 | { |
2539 | /* Having a step-resume breakpoint overrides anything | |
2540 | else having to do with stepping commands until | |
2541 | that breakpoint is reached. */ | |
2542 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2543 | whether it could/should be keep_going. */ | |
2544 | check_sigtramp2 (ecs); | |
d4f3574e SS |
2545 | keep_going (ecs); |
2546 | return; | |
104c1213 JM |
2547 | } |
2548 | ||
c5aa993b | 2549 | if (step_range_end == 0) |
104c1213 JM |
2550 | { |
2551 | /* Likewise if we aren't even stepping. */ | |
2552 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2553 | whether it could/should be keep_going. */ | |
2554 | check_sigtramp2 (ecs); | |
d4f3574e SS |
2555 | keep_going (ecs); |
2556 | return; | |
104c1213 | 2557 | } |
c5aa993b JM |
2558 | |
2559 | /* If stepping through a line, keep going if still within it. | |
2560 | ||
2561 | Note that step_range_end is the address of the first instruction | |
2562 | beyond the step range, and NOT the address of the last instruction | |
2563 | within it! */ | |
2564 | if (stop_pc >= step_range_start | |
2565 | && stop_pc < step_range_end) | |
2566 | { | |
2567 | /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal. | |
2568 | So definately need to check for sigtramp here. */ | |
104c1213 | 2569 | check_sigtramp2 (ecs); |
d4f3574e SS |
2570 | keep_going (ecs); |
2571 | return; | |
c5aa993b | 2572 | } |
c906108c | 2573 | |
c5aa993b | 2574 | /* We stepped out of the stepping range. */ |
c906108c | 2575 | |
c5aa993b JM |
2576 | /* If we are stepping at the source level and entered the runtime |
2577 | loader dynamic symbol resolution code, we keep on single stepping | |
2578 | until we exit the run time loader code and reach the callee's | |
2579 | address. */ | |
2580 | if (step_over_calls < 0 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) | |
d4f3574e SS |
2581 | { |
2582 | CORE_ADDR pc_after_resolver = SKIP_SOLIB_RESOLVER (stop_pc); | |
2583 | ||
2584 | if (pc_after_resolver) | |
2585 | { | |
2586 | /* Set up a step-resume breakpoint at the address | |
2587 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2588 | struct symtab_and_line sr_sal; | |
2589 | INIT_SAL (&sr_sal); | |
2590 | sr_sal.pc = pc_after_resolver; | |
2591 | ||
2592 | check_for_old_step_resume_breakpoint (); | |
2593 | step_resume_breakpoint = | |
2594 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2595 | if (breakpoints_inserted) | |
2596 | insert_breakpoints (); | |
2597 | } | |
2598 | ||
2599 | keep_going (ecs); | |
2600 | return; | |
2601 | } | |
c906108c | 2602 | |
c5aa993b JM |
2603 | /* We can't update step_sp every time through the loop, because |
2604 | reading the stack pointer would slow down stepping too much. | |
2605 | But we can update it every time we leave the step range. */ | |
2606 | ecs->update_step_sp = 1; | |
c906108c | 2607 | |
c5aa993b JM |
2608 | /* Did we just take a signal? */ |
2609 | if (IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
2610 | && !IN_SIGTRAMP (prev_pc, prev_func_name) | |
2611 | && INNER_THAN (read_sp (), step_sp)) | |
2612 | { | |
2613 | /* We've just taken a signal; go until we are back to | |
2614 | the point where we took it and one more. */ | |
c906108c | 2615 | |
c5aa993b JM |
2616 | /* Note: The test above succeeds not only when we stepped |
2617 | into a signal handler, but also when we step past the last | |
2618 | statement of a signal handler and end up in the return stub | |
2619 | of the signal handler trampoline. To distinguish between | |
2620 | these two cases, check that the frame is INNER_THAN the | |
2621 | previous one below. pai/1997-09-11 */ | |
c906108c | 2622 | |
c906108c | 2623 | |
c5aa993b JM |
2624 | { |
2625 | CORE_ADDR current_frame = FRAME_FP (get_current_frame ()); | |
c906108c | 2626 | |
c5aa993b JM |
2627 | if (INNER_THAN (current_frame, step_frame_address)) |
2628 | { | |
2629 | /* We have just taken a signal; go until we are back to | |
2630 | the point where we took it and one more. */ | |
c906108c | 2631 | |
c5aa993b JM |
2632 | /* This code is needed at least in the following case: |
2633 | The user types "next" and then a signal arrives (before | |
2634 | the "next" is done). */ | |
c906108c | 2635 | |
c5aa993b JM |
2636 | /* Note that if we are stopped at a breakpoint, then we need |
2637 | the step_resume breakpoint to override any breakpoints at | |
2638 | the same location, so that we will still step over the | |
2639 | breakpoint even though the signal happened. */ | |
2640 | struct symtab_and_line sr_sal; | |
c906108c | 2641 | |
c5aa993b JM |
2642 | INIT_SAL (&sr_sal); |
2643 | sr_sal.symtab = NULL; | |
2644 | sr_sal.line = 0; | |
2645 | sr_sal.pc = prev_pc; | |
2646 | /* We could probably be setting the frame to | |
2647 | step_frame_address; I don't think anyone thought to | |
2648 | try it. */ | |
a0b3c4fd | 2649 | check_for_old_step_resume_breakpoint (); |
c5aa993b JM |
2650 | step_resume_breakpoint = |
2651 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2652 | if (breakpoints_inserted) | |
2653 | insert_breakpoints (); | |
c906108c | 2654 | } |
c5aa993b | 2655 | else |
c906108c | 2656 | { |
c5aa993b JM |
2657 | /* We just stepped out of a signal handler and into |
2658 | its calling trampoline. | |
2659 | ||
d4f3574e | 2660 | Normally, we'd call step_over_function from |
c5aa993b JM |
2661 | here, but for some reason GDB can't unwind the |
2662 | stack correctly to find the real PC for the point | |
2663 | user code where the signal trampoline will return | |
2664 | -- FRAME_SAVED_PC fails, at least on HP-UX 10.20. | |
2665 | But signal trampolines are pretty small stubs of | |
2666 | code, anyway, so it's OK instead to just | |
2667 | single-step out. Note: assuming such trampolines | |
2668 | don't exhibit recursion on any platform... */ | |
2669 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
2670 | &ecs->stop_func_start, | |
2671 | &ecs->stop_func_end); | |
2672 | /* Readjust stepping range */ | |
2673 | step_range_start = ecs->stop_func_start; | |
2674 | step_range_end = ecs->stop_func_end; | |
2675 | ecs->stepping_through_sigtramp = 1; | |
c906108c | 2676 | } |
c906108c SS |
2677 | } |
2678 | ||
c906108c | 2679 | |
c5aa993b JM |
2680 | /* If this is stepi or nexti, make sure that the stepping range |
2681 | gets us past that instruction. */ | |
2682 | if (step_range_end == 1) | |
2683 | /* FIXME: Does this run afoul of the code below which, if | |
2684 | we step into the middle of a line, resets the stepping | |
2685 | range? */ | |
2686 | step_range_end = (step_range_start = prev_pc) + 1; | |
c906108c | 2687 | |
c5aa993b | 2688 | ecs->remove_breakpoints_on_following_step = 1; |
d4f3574e SS |
2689 | keep_going (ecs); |
2690 | return; | |
c5aa993b | 2691 | } |
c906108c | 2692 | |
c5aa993b JM |
2693 | if (stop_pc == ecs->stop_func_start /* Quick test */ |
2694 | || (in_prologue (stop_pc, ecs->stop_func_start) && | |
2695 | !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2696 | || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name) | |
2697 | || ecs->stop_func_name == 0) | |
2698 | { | |
2699 | /* It's a subroutine call. */ | |
c906108c | 2700 | |
c5aa993b | 2701 | if (step_over_calls == 0) |
c906108c | 2702 | { |
c5aa993b JM |
2703 | /* I presume that step_over_calls is only 0 when we're |
2704 | supposed to be stepping at the assembly language level | |
2705 | ("stepi"). Just stop. */ | |
2706 | stop_step = 1; | |
11cf8741 | 2707 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2708 | stop_stepping (ecs); |
2709 | return; | |
c5aa993b | 2710 | } |
c906108c | 2711 | |
c5aa993b | 2712 | if (step_over_calls > 0 || IGNORE_HELPER_CALL (stop_pc)) |
d4f3574e SS |
2713 | { |
2714 | /* We're doing a "next". */ | |
2715 | step_over_function (ecs); | |
2716 | keep_going (ecs); | |
2717 | return; | |
2718 | } | |
c5aa993b JM |
2719 | |
2720 | /* If we are in a function call trampoline (a stub between | |
2721 | the calling routine and the real function), locate the real | |
2722 | function. That's what tells us (a) whether we want to step | |
2723 | into it at all, and (b) what prologue we want to run to | |
2724 | the end of, if we do step into it. */ | |
2725 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2726 | if (tmp != 0) | |
2727 | ecs->stop_func_start = tmp; | |
2728 | else | |
2729 | { | |
2730 | tmp = DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc); | |
2731 | if (tmp) | |
c906108c | 2732 | { |
c5aa993b JM |
2733 | struct symtab_and_line xxx; |
2734 | /* Why isn't this s_a_l called "sr_sal", like all of the | |
2735 | other s_a_l's where this code is duplicated? */ | |
2736 | INIT_SAL (&xxx); /* initialize to zeroes */ | |
2737 | xxx.pc = tmp; | |
2738 | xxx.section = find_pc_overlay (xxx.pc); | |
a0b3c4fd | 2739 | check_for_old_step_resume_breakpoint (); |
c906108c | 2740 | step_resume_breakpoint = |
c5aa993b JM |
2741 | set_momentary_breakpoint (xxx, NULL, bp_step_resume); |
2742 | insert_breakpoints (); | |
d4f3574e SS |
2743 | keep_going (ecs); |
2744 | return; | |
c906108c SS |
2745 | } |
2746 | } | |
2747 | ||
c5aa993b JM |
2748 | /* If we have line number information for the function we |
2749 | are thinking of stepping into, step into it. | |
c906108c | 2750 | |
c5aa993b JM |
2751 | If there are several symtabs at that PC (e.g. with include |
2752 | files), just want to know whether *any* of them have line | |
2753 | numbers. find_pc_line handles this. */ | |
2754 | { | |
2755 | struct symtab_and_line tmp_sal; | |
c906108c | 2756 | |
c5aa993b JM |
2757 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2758 | if (tmp_sal.line != 0) | |
c2c6d25f JM |
2759 | { |
2760 | step_into_function (ecs); | |
2761 | return; | |
2762 | } | |
c906108c | 2763 | } |
d4f3574e SS |
2764 | step_over_function (ecs); |
2765 | keep_going (ecs); | |
2766 | return; | |
c906108c | 2767 | |
c5aa993b | 2768 | } |
c906108c | 2769 | |
c5aa993b | 2770 | /* We've wandered out of the step range. */ |
c906108c | 2771 | |
c5aa993b | 2772 | ecs->sal = find_pc_line (stop_pc, 0); |
c906108c | 2773 | |
c5aa993b JM |
2774 | if (step_range_end == 1) |
2775 | { | |
2776 | /* It is stepi or nexti. We always want to stop stepping after | |
2777 | one instruction. */ | |
2778 | stop_step = 1; | |
11cf8741 | 2779 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2780 | stop_stepping (ecs); |
2781 | return; | |
c5aa993b | 2782 | } |
c906108c | 2783 | |
c5aa993b JM |
2784 | /* If we're in the return path from a shared library trampoline, |
2785 | we want to proceed through the trampoline when stepping. */ | |
2786 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2787 | { | |
2788 | CORE_ADDR tmp; | |
c906108c | 2789 | |
c5aa993b JM |
2790 | /* Determine where this trampoline returns. */ |
2791 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
c906108c | 2792 | |
c5aa993b JM |
2793 | /* Only proceed through if we know where it's going. */ |
2794 | if (tmp) | |
2795 | { | |
2796 | /* And put the step-breakpoint there and go until there. */ | |
2797 | struct symtab_and_line sr_sal; | |
c906108c | 2798 | |
c5aa993b JM |
2799 | INIT_SAL (&sr_sal); /* initialize to zeroes */ |
2800 | sr_sal.pc = tmp; | |
2801 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2802 | /* Do not specify what the fp should be when we stop | |
2803 | since on some machines the prologue | |
2804 | is where the new fp value is established. */ | |
a0b3c4fd | 2805 | check_for_old_step_resume_breakpoint (); |
c5aa993b JM |
2806 | step_resume_breakpoint = |
2807 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2808 | if (breakpoints_inserted) | |
2809 | insert_breakpoints (); | |
c906108c | 2810 | |
c5aa993b JM |
2811 | /* Restart without fiddling with the step ranges or |
2812 | other state. */ | |
d4f3574e SS |
2813 | keep_going (ecs); |
2814 | return; | |
c5aa993b JM |
2815 | } |
2816 | } | |
c906108c | 2817 | |
c5aa993b | 2818 | if (ecs->sal.line == 0) |
c906108c | 2819 | { |
c5aa993b JM |
2820 | /* We have no line number information. That means to stop |
2821 | stepping (does this always happen right after one instruction, | |
2822 | when we do "s" in a function with no line numbers, | |
2823 | or can this happen as a result of a return or longjmp?). */ | |
2824 | stop_step = 1; | |
11cf8741 | 2825 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2826 | stop_stepping (ecs); |
2827 | return; | |
c906108c SS |
2828 | } |
2829 | ||
c5aa993b JM |
2830 | if ((stop_pc == ecs->sal.pc) |
2831 | && (ecs->current_line != ecs->sal.line || ecs->current_symtab != ecs->sal.symtab)) | |
2832 | { | |
2833 | /* We are at the start of a different line. So stop. Note that | |
2834 | we don't stop if we step into the middle of a different line. | |
2835 | That is said to make things like for (;;) statements work | |
2836 | better. */ | |
2837 | stop_step = 1; | |
11cf8741 | 2838 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2839 | stop_stepping (ecs); |
2840 | return; | |
c5aa993b | 2841 | } |
c906108c | 2842 | |
c5aa993b | 2843 | /* We aren't done stepping. |
c906108c | 2844 | |
c5aa993b JM |
2845 | Optimize by setting the stepping range to the line. |
2846 | (We might not be in the original line, but if we entered a | |
2847 | new line in mid-statement, we continue stepping. This makes | |
2848 | things like for(;;) statements work better.) */ | |
c906108c | 2849 | |
c5aa993b JM |
2850 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
2851 | { | |
2852 | /* If this is the last line of the function, don't keep stepping | |
2853 | (it would probably step us out of the function). | |
2854 | This is particularly necessary for a one-line function, | |
2855 | in which after skipping the prologue we better stop even though | |
2856 | we will be in mid-line. */ | |
2857 | stop_step = 1; | |
11cf8741 | 2858 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2859 | stop_stepping (ecs); |
2860 | return; | |
c5aa993b JM |
2861 | } |
2862 | step_range_start = ecs->sal.pc; | |
2863 | step_range_end = ecs->sal.end; | |
2864 | step_frame_address = FRAME_FP (get_current_frame ()); | |
2865 | ecs->current_line = ecs->sal.line; | |
2866 | ecs->current_symtab = ecs->sal.symtab; | |
2867 | ||
2868 | /* In the case where we just stepped out of a function into the middle | |
2869 | of a line of the caller, continue stepping, but step_frame_address | |
2870 | must be modified to current frame */ | |
2871 | { | |
2872 | CORE_ADDR current_frame = FRAME_FP (get_current_frame ()); | |
2873 | if (!(INNER_THAN (current_frame, step_frame_address))) | |
2874 | step_frame_address = current_frame; | |
2875 | } | |
c906108c | 2876 | |
d4f3574e | 2877 | keep_going (ecs); |
cd0fc7c3 | 2878 | |
104c1213 | 2879 | } /* extra brace, to preserve old indentation */ |
104c1213 JM |
2880 | } |
2881 | ||
2882 | /* Are we in the middle of stepping? */ | |
2883 | ||
2884 | static int | |
2885 | currently_stepping (struct execution_control_state *ecs) | |
2886 | { | |
2887 | return ((through_sigtramp_breakpoint == NULL | |
2888 | && !ecs->handling_longjmp | |
2889 | && ((step_range_end && step_resume_breakpoint == NULL) | |
2890 | || trap_expected)) | |
2891 | || ecs->stepping_through_solib_after_catch | |
2892 | || bpstat_should_step ()); | |
2893 | } | |
c906108c | 2894 | |
104c1213 JM |
2895 | static void |
2896 | check_sigtramp2 (struct execution_control_state *ecs) | |
2897 | { | |
2898 | if (trap_expected | |
2899 | && IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
2900 | && !IN_SIGTRAMP (prev_pc, prev_func_name) | |
2901 | && INNER_THAN (read_sp (), step_sp)) | |
2902 | { | |
2903 | /* What has happened here is that we have just stepped the | |
2904 | inferior with a signal (because it is a signal which | |
2905 | shouldn't make us stop), thus stepping into sigtramp. | |
2906 | ||
2907 | So we need to set a step_resume_break_address breakpoint and | |
2908 | continue until we hit it, and then step. FIXME: This should | |
2909 | be more enduring than a step_resume breakpoint; we should | |
2910 | know that we will later need to keep going rather than | |
2911 | re-hitting the breakpoint here (see the testsuite, | |
2912 | gdb.base/signals.exp where it says "exceedingly difficult"). */ | |
2913 | ||
2914 | struct symtab_and_line sr_sal; | |
2915 | ||
2916 | INIT_SAL (&sr_sal); /* initialize to zeroes */ | |
2917 | sr_sal.pc = prev_pc; | |
2918 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2919 | /* We perhaps could set the frame if we kept track of what the | |
2920 | frame corresponding to prev_pc was. But we don't, so don't. */ | |
2921 | through_sigtramp_breakpoint = | |
2922 | set_momentary_breakpoint (sr_sal, NULL, bp_through_sigtramp); | |
2923 | if (breakpoints_inserted) | |
2924 | insert_breakpoints (); | |
cd0fc7c3 | 2925 | |
104c1213 JM |
2926 | ecs->remove_breakpoints_on_following_step = 1; |
2927 | ecs->another_trap = 1; | |
2928 | } | |
2929 | } | |
2930 | ||
c2c6d25f JM |
2931 | /* Subroutine call with source code we should not step over. Do step |
2932 | to the first line of code in it. */ | |
2933 | ||
2934 | static void | |
2935 | step_into_function (struct execution_control_state *ecs) | |
2936 | { | |
2937 | struct symtab *s; | |
2938 | struct symtab_and_line sr_sal; | |
2939 | ||
2940 | s = find_pc_symtab (stop_pc); | |
2941 | if (s && s->language != language_asm) | |
2942 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
2943 | ||
2944 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2945 | /* Use the step_resume_break to step until the end of the prologue, | |
2946 | even if that involves jumps (as it seems to on the vax under | |
2947 | 4.2). */ | |
2948 | /* If the prologue ends in the middle of a source line, continue to | |
2949 | the end of that source line (if it is still within the function). | |
2950 | Otherwise, just go to end of prologue. */ | |
2951 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP | |
2952 | /* no, don't either. It skips any code that's legitimately on the | |
2953 | first line. */ | |
2954 | #else | |
2955 | if (ecs->sal.end | |
2956 | && ecs->sal.pc != ecs->stop_func_start | |
2957 | && ecs->sal.end < ecs->stop_func_end) | |
2958 | ecs->stop_func_start = ecs->sal.end; | |
2959 | #endif | |
2960 | ||
2961 | if (ecs->stop_func_start == stop_pc) | |
2962 | { | |
2963 | /* We are already there: stop now. */ | |
2964 | stop_step = 1; | |
11cf8741 | 2965 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2966 | stop_stepping (ecs); |
2967 | return; | |
2968 | } | |
2969 | else | |
2970 | { | |
2971 | /* Put the step-breakpoint there and go until there. */ | |
2972 | INIT_SAL (&sr_sal); /* initialize to zeroes */ | |
2973 | sr_sal.pc = ecs->stop_func_start; | |
2974 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
2975 | /* Do not specify what the fp should be when we stop since on | |
2976 | some machines the prologue is where the new fp value is | |
2977 | established. */ | |
2978 | check_for_old_step_resume_breakpoint (); | |
2979 | step_resume_breakpoint = | |
2980 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2981 | if (breakpoints_inserted) | |
2982 | insert_breakpoints (); | |
2983 | ||
2984 | /* And make sure stepping stops right away then. */ | |
2985 | step_range_end = step_range_start; | |
2986 | } | |
2987 | keep_going (ecs); | |
2988 | } | |
d4f3574e SS |
2989 | |
2990 | /* We've just entered a callee, and we wish to resume until it returns | |
2991 | to the caller. Setting a step_resume breakpoint on the return | |
2992 | address will catch a return from the callee. | |
2993 | ||
2994 | However, if the callee is recursing, we want to be careful not to | |
2995 | catch returns of those recursive calls, but only of THIS instance | |
2996 | of the call. | |
2997 | ||
2998 | To do this, we set the step_resume bp's frame to our current | |
2999 | caller's frame (step_frame_address, which is set by the "next" or | |
3000 | "until" command, before execution begins). */ | |
3001 | ||
3002 | static void | |
3003 | step_over_function (struct execution_control_state *ecs) | |
3004 | { | |
3005 | struct symtab_and_line sr_sal; | |
3006 | ||
3007 | INIT_SAL (&sr_sal); /* initialize to zeros */ | |
3008 | sr_sal.pc = ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ())); | |
3009 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
3010 | ||
3011 | check_for_old_step_resume_breakpoint (); | |
3012 | step_resume_breakpoint = | |
3013 | set_momentary_breakpoint (sr_sal, get_current_frame (), bp_step_resume); | |
3014 | ||
3015 | if (!IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc)) | |
3016 | step_resume_breakpoint->frame = step_frame_address; | |
3017 | ||
3018 | if (breakpoints_inserted) | |
3019 | insert_breakpoints (); | |
3020 | } | |
3021 | ||
104c1213 JM |
3022 | static void |
3023 | stop_stepping (struct execution_control_state *ecs) | |
3024 | { | |
c906108c SS |
3025 | if (target_has_execution) |
3026 | { | |
3027 | /* Are we stopping for a vfork event? We only stop when we see | |
3028 | the child's event. However, we may not yet have seen the | |
104c1213 JM |
3029 | parent's event. And, inferior_pid is still set to the |
3030 | parent's pid, until we resume again and follow either the | |
3031 | parent or child. | |
c906108c SS |
3032 | |
3033 | To ensure that we can really touch inferior_pid (aka, the | |
3034 | parent process) -- which calls to functions like read_pc | |
3035 | implicitly do -- wait on the parent if necessary. */ | |
3036 | if ((pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
3037 | && !pending_follow.fork_event.saw_parent_fork) | |
3038 | { | |
3039 | int parent_pid; | |
3040 | ||
3041 | do | |
3042 | { | |
3043 | if (target_wait_hook) | |
cd0fc7c3 | 3044 | parent_pid = target_wait_hook (-1, &(ecs->ws)); |
c906108c | 3045 | else |
cd0fc7c3 | 3046 | parent_pid = target_wait (-1, &(ecs->ws)); |
c906108c SS |
3047 | } |
3048 | while (parent_pid != inferior_pid); | |
3049 | } | |
3050 | ||
c906108c | 3051 | /* Assuming the inferior still exists, set these up for next |
c5aa993b JM |
3052 | time, just like we did above if we didn't break out of the |
3053 | loop. */ | |
c906108c | 3054 | prev_pc = read_pc (); |
cd0fc7c3 SS |
3055 | prev_func_start = ecs->stop_func_start; |
3056 | prev_func_name = ecs->stop_func_name; | |
c906108c | 3057 | } |
104c1213 | 3058 | |
cd0fc7c3 SS |
3059 | /* Let callers know we don't want to wait for the inferior anymore. */ |
3060 | ecs->wait_some_more = 0; | |
3061 | } | |
3062 | ||
d4f3574e SS |
3063 | /* This function handles various cases where we need to continue |
3064 | waiting for the inferior. */ | |
3065 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
3066 | ||
3067 | static void | |
3068 | keep_going (struct execution_control_state *ecs) | |
3069 | { | |
3070 | /* ??rehrauer: ttrace on HP-UX theoretically allows one to debug a | |
3071 | vforked child between its creation and subsequent exit or call to | |
3072 | exec(). However, I had big problems in this rather creaky exec | |
3073 | engine, getting that to work. The fundamental problem is that | |
3074 | I'm trying to debug two processes via an engine that only | |
3075 | understands a single process with possibly multiple threads. | |
3076 | ||
3077 | Hence, this spot is known to have problems when | |
3078 | target_can_follow_vfork_prior_to_exec returns 1. */ | |
3079 | ||
3080 | /* Save the pc before execution, to compare with pc after stop. */ | |
3081 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ | |
3082 | prev_func_start = ecs->stop_func_start; /* Ok, since if DECR_PC_AFTER | |
3083 | BREAK is defined, the | |
3084 | original pc would not have | |
3085 | been at the start of a | |
3086 | function. */ | |
3087 | prev_func_name = ecs->stop_func_name; | |
3088 | ||
3089 | if (ecs->update_step_sp) | |
3090 | step_sp = read_sp (); | |
3091 | ecs->update_step_sp = 0; | |
3092 | ||
3093 | /* If we did not do break;, it means we should keep running the | |
3094 | inferior and not return to debugger. */ | |
3095 | ||
3096 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
3097 | { | |
3098 | /* We took a signal (which we are supposed to pass through to | |
3099 | the inferior, else we'd have done a break above) and we | |
3100 | haven't yet gotten our trap. Simply continue. */ | |
3101 | resume (currently_stepping (ecs), stop_signal); | |
3102 | } | |
3103 | else | |
3104 | { | |
3105 | /* Either the trap was not expected, but we are continuing | |
3106 | anyway (the user asked that this signal be passed to the | |
3107 | child) | |
3108 | -- or -- | |
3109 | The signal was SIGTRAP, e.g. it was our signal, but we | |
3110 | decided we should resume from it. | |
3111 | ||
3112 | We're going to run this baby now! | |
3113 | ||
3114 | Insert breakpoints now, unless we are trying to one-proceed | |
3115 | past a breakpoint. */ | |
3116 | /* If we've just finished a special step resume and we don't | |
3117 | want to hit a breakpoint, pull em out. */ | |
3118 | if (step_resume_breakpoint == NULL | |
3119 | && through_sigtramp_breakpoint == NULL | |
3120 | && ecs->remove_breakpoints_on_following_step) | |
3121 | { | |
3122 | ecs->remove_breakpoints_on_following_step = 0; | |
3123 | remove_breakpoints (); | |
3124 | breakpoints_inserted = 0; | |
3125 | } | |
3126 | else if (!breakpoints_inserted && | |
3127 | (through_sigtramp_breakpoint != NULL || !ecs->another_trap)) | |
3128 | { | |
3129 | breakpoints_failed = insert_breakpoints (); | |
3130 | if (breakpoints_failed) | |
3131 | { | |
3132 | stop_stepping (ecs); | |
3133 | return; | |
3134 | } | |
3135 | breakpoints_inserted = 1; | |
3136 | } | |
3137 | ||
3138 | trap_expected = ecs->another_trap; | |
3139 | ||
3140 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
3141 | specifies that such a signal should be delivered to the | |
3142 | target program). | |
3143 | ||
3144 | Typically, this would occure when a user is debugging a | |
3145 | target monitor on a simulator: the target monitor sets a | |
3146 | breakpoint; the simulator encounters this break-point and | |
3147 | halts the simulation handing control to GDB; GDB, noteing | |
3148 | that the break-point isn't valid, returns control back to the | |
3149 | simulator; the simulator then delivers the hardware | |
3150 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
3151 | ||
3152 | if (stop_signal == TARGET_SIGNAL_TRAP | |
3153 | && !signal_program[stop_signal]) | |
3154 | stop_signal = TARGET_SIGNAL_0; | |
3155 | ||
3156 | #ifdef SHIFT_INST_REGS | |
3157 | /* I'm not sure when this following segment applies. I do know, | |
3158 | now, that we shouldn't rewrite the regs when we were stopped | |
3159 | by a random signal from the inferior process. */ | |
3160 | /* FIXME: Shouldn't this be based on the valid bit of the SXIP? | |
3161 | (this is only used on the 88k). */ | |
3162 | ||
3163 | if (!bpstat_explains_signal (stop_bpstat) | |
3164 | && (stop_signal != TARGET_SIGNAL_CHLD) | |
3165 | && !stopped_by_random_signal) | |
3166 | SHIFT_INST_REGS (); | |
3167 | #endif /* SHIFT_INST_REGS */ | |
3168 | ||
3169 | resume (currently_stepping (ecs), stop_signal); | |
3170 | } | |
3171 | ||
3172 | prepare_to_wait (ecs); | |
3173 | } | |
3174 | ||
104c1213 JM |
3175 | /* This function normally comes after a resume, before |
3176 | handle_inferior_event exits. It takes care of any last bits of | |
3177 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 3178 | |
104c1213 JM |
3179 | static void |
3180 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 3181 | { |
104c1213 JM |
3182 | if (ecs->infwait_state == infwait_normal_state) |
3183 | { | |
3184 | overlay_cache_invalid = 1; | |
3185 | ||
3186 | /* We have to invalidate the registers BEFORE calling | |
3187 | target_wait because they can be loaded from the target while | |
3188 | in target_wait. This makes remote debugging a bit more | |
3189 | efficient for those targets that provide critical registers | |
3190 | as part of their normal status mechanism. */ | |
3191 | ||
3192 | registers_changed (); | |
3193 | ecs->waiton_pid = -1; | |
3194 | ecs->wp = &(ecs->ws); | |
3195 | } | |
3196 | /* This is the old end of the while loop. Let everybody know we | |
3197 | want to wait for the inferior some more and get called again | |
3198 | soon. */ | |
3199 | ecs->wait_some_more = 1; | |
c906108c | 3200 | } |
11cf8741 JM |
3201 | |
3202 | /* Print why the inferior has stopped. We always print something when | |
3203 | the inferior exits, or receives a signal. The rest of the cases are | |
3204 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
3205 | there should be a call to this function from handle_inferior_event() | |
3206 | each time stop_stepping() is called.*/ | |
3207 | static void | |
3208 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
3209 | { | |
3210 | switch (stop_reason) | |
3211 | { | |
3212 | case STOP_UNKNOWN: | |
3213 | /* We don't deal with these cases from handle_inferior_event() | |
3214 | yet. */ | |
3215 | break; | |
3216 | case END_STEPPING_RANGE: | |
3217 | /* We are done with a step/next/si/ni command. */ | |
3218 | /* For now print nothing. */ | |
3219 | break; | |
3220 | case BREAKPOINT_HIT: | |
3221 | /* We found a breakpoint. */ | |
3222 | /* For now print nothing. */ | |
3223 | break; | |
3224 | case SIGNAL_EXITED: | |
3225 | /* The inferior was terminated by a signal. */ | |
3226 | annotate_signalled (); | |
3227 | printf_filtered ("\nProgram terminated with signal "); | |
3228 | annotate_signal_name (); | |
3229 | printf_filtered ("%s", target_signal_to_name (stop_info)); | |
3230 | annotate_signal_name_end (); | |
3231 | printf_filtered (", "); | |
3232 | annotate_signal_string (); | |
3233 | printf_filtered ("%s", target_signal_to_string (stop_info)); | |
3234 | annotate_signal_string_end (); | |
3235 | printf_filtered (".\n"); | |
3236 | ||
3237 | printf_filtered ("The program no longer exists.\n"); | |
3238 | gdb_flush (gdb_stdout); | |
3239 | break; | |
3240 | case EXITED: | |
3241 | /* The inferior program is finished. */ | |
3242 | annotate_exited (stop_info); | |
3243 | if (stop_info) | |
3244 | printf_filtered ("\nProgram exited with code 0%o.\n", | |
3245 | (unsigned int) stop_info); | |
3246 | else | |
3247 | printf_filtered ("\nProgram exited normally.\n"); | |
3248 | break; | |
3249 | case SIGNAL_RECEIVED: | |
3250 | /* Signal received. The signal table tells us to print about | |
3251 | it. */ | |
3252 | annotate_signal (); | |
3253 | printf_filtered ("\nProgram received signal "); | |
3254 | annotate_signal_name (); | |
3255 | printf_filtered ("%s", target_signal_to_name (stop_info)); | |
3256 | annotate_signal_name_end (); | |
3257 | printf_filtered (", "); | |
3258 | annotate_signal_string (); | |
3259 | printf_filtered ("%s", target_signal_to_string (stop_info)); | |
3260 | annotate_signal_string_end (); | |
3261 | printf_filtered (".\n"); | |
3262 | gdb_flush (gdb_stdout); | |
3263 | break; | |
3264 | default: | |
3265 | internal_error ("print_stop_reason: unrecognized enum value"); | |
3266 | break; | |
3267 | } | |
3268 | } | |
c906108c | 3269 | \f |
43ff13b4 | 3270 | |
c906108c SS |
3271 | /* Here to return control to GDB when the inferior stops for real. |
3272 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
3273 | ||
3274 | STOP_PRINT_FRAME nonzero means print the executing frame | |
3275 | (pc, function, args, file, line number and line text). | |
3276 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
3277 | attempting to insert breakpoints. */ | |
3278 | ||
3279 | void | |
96baa820 | 3280 | normal_stop (void) |
c906108c | 3281 | { |
c906108c SS |
3282 | /* As with the notification of thread events, we want to delay |
3283 | notifying the user that we've switched thread context until | |
3284 | the inferior actually stops. | |
3285 | ||
3286 | (Note that there's no point in saying anything if the inferior | |
3287 | has exited!) */ | |
c3f6f71d | 3288 | if ((previous_inferior_pid != inferior_pid) |
7a292a7a | 3289 | && target_has_execution) |
c906108c SS |
3290 | { |
3291 | target_terminal_ours_for_output (); | |
c3f6f71d | 3292 | printf_filtered ("[Switching to %s]\n", |
c906108c | 3293 | target_pid_or_tid_to_str (inferior_pid)); |
c3f6f71d | 3294 | previous_inferior_pid = inferior_pid; |
c906108c | 3295 | } |
c906108c SS |
3296 | |
3297 | /* Make sure that the current_frame's pc is correct. This | |
3298 | is a correction for setting up the frame info before doing | |
3299 | DECR_PC_AFTER_BREAK */ | |
3300 | if (target_has_execution && get_current_frame ()) | |
3301 | (get_current_frame ())->pc = read_pc (); | |
3302 | ||
3303 | if (breakpoints_failed) | |
3304 | { | |
3305 | target_terminal_ours_for_output (); | |
3306 | print_sys_errmsg ("ptrace", breakpoints_failed); | |
3307 | printf_filtered ("Stopped; cannot insert breakpoints.\n\ | |
3308 | The same program may be running in another process.\n"); | |
3309 | } | |
3310 | ||
3311 | if (target_has_execution && breakpoints_inserted) | |
3312 | { | |
3313 | if (remove_breakpoints ()) | |
3314 | { | |
3315 | target_terminal_ours_for_output (); | |
3316 | printf_filtered ("Cannot remove breakpoints because "); | |
3317 | printf_filtered ("program is no longer writable.\n"); | |
3318 | printf_filtered ("It might be running in another process.\n"); | |
3319 | printf_filtered ("Further execution is probably impossible.\n"); | |
3320 | } | |
3321 | } | |
3322 | breakpoints_inserted = 0; | |
3323 | ||
3324 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3325 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3326 | ||
3327 | breakpoint_auto_delete (stop_bpstat); | |
3328 | ||
3329 | /* If an auto-display called a function and that got a signal, | |
3330 | delete that auto-display to avoid an infinite recursion. */ | |
3331 | ||
3332 | if (stopped_by_random_signal) | |
3333 | disable_current_display (); | |
3334 | ||
3335 | /* Don't print a message if in the middle of doing a "step n" | |
3336 | operation for n > 1 */ | |
3337 | if (step_multi && stop_step) | |
3338 | goto done; | |
3339 | ||
3340 | target_terminal_ours (); | |
3341 | ||
c906108c SS |
3342 | /* Look up the hook_stop and run it if it exists. */ |
3343 | ||
3344 | if (stop_command && stop_command->hook) | |
3345 | { | |
3346 | catch_errors (hook_stop_stub, stop_command->hook, | |
3347 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
3348 | } | |
3349 | ||
3350 | if (!target_has_stack) | |
3351 | { | |
3352 | ||
3353 | goto done; | |
3354 | } | |
3355 | ||
3356 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3357 | and current location is based on that. | |
3358 | Don't do this on return from a stack dummy routine, | |
3359 | or if the program has exited. */ | |
3360 | ||
3361 | if (!stop_stack_dummy) | |
3362 | { | |
3363 | select_frame (get_current_frame (), 0); | |
3364 | ||
3365 | /* Print current location without a level number, if | |
c5aa993b JM |
3366 | we have changed functions or hit a breakpoint. |
3367 | Print source line if we have one. | |
3368 | bpstat_print() contains the logic deciding in detail | |
3369 | what to print, based on the event(s) that just occurred. */ | |
c906108c SS |
3370 | |
3371 | if (stop_print_frame) | |
3372 | { | |
3373 | int bpstat_ret; | |
3374 | int source_flag; | |
917317f4 | 3375 | int do_frame_printing = 1; |
c906108c SS |
3376 | |
3377 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3378 | switch (bpstat_ret) |
3379 | { | |
3380 | case PRINT_UNKNOWN: | |
3381 | if (stop_step | |
3382 | && step_frame_address == FRAME_FP (get_current_frame ()) | |
3383 | && step_start_function == find_pc_function (stop_pc)) | |
3384 | source_flag = -1; /* finished step, just print source line */ | |
3385 | else | |
3386 | source_flag = 1; /* print location and source line */ | |
3387 | break; | |
3388 | case PRINT_SRC_AND_LOC: | |
3389 | source_flag = 1; /* print location and source line */ | |
3390 | break; | |
3391 | case PRINT_SRC_ONLY: | |
3392 | source_flag = -1; | |
3393 | break; | |
3394 | case PRINT_NOTHING: | |
3395 | do_frame_printing = 0; | |
3396 | break; | |
3397 | default: | |
3398 | internal_error ("Unknown value."); | |
3399 | } | |
c906108c SS |
3400 | |
3401 | /* The behavior of this routine with respect to the source | |
3402 | flag is: | |
3403 | -1: Print only source line | |
3404 | 0: Print only location | |
3405 | 1: Print location and source line */ | |
917317f4 JM |
3406 | if (do_frame_printing) |
3407 | show_and_print_stack_frame (selected_frame, -1, source_flag); | |
c906108c SS |
3408 | |
3409 | /* Display the auto-display expressions. */ | |
3410 | do_displays (); | |
3411 | } | |
3412 | } | |
3413 | ||
3414 | /* Save the function value return registers, if we care. | |
3415 | We might be about to restore their previous contents. */ | |
3416 | if (proceed_to_finish) | |
3417 | read_register_bytes (0, stop_registers, REGISTER_BYTES); | |
3418 | ||
3419 | if (stop_stack_dummy) | |
3420 | { | |
3421 | /* Pop the empty frame that contains the stack dummy. | |
3422 | POP_FRAME ends with a setting of the current frame, so we | |
c5aa993b | 3423 | can use that next. */ |
c906108c SS |
3424 | POP_FRAME; |
3425 | /* Set stop_pc to what it was before we called the function. | |
c5aa993b JM |
3426 | Can't rely on restore_inferior_status because that only gets |
3427 | called if we don't stop in the called function. */ | |
c906108c SS |
3428 | stop_pc = read_pc (); |
3429 | select_frame (get_current_frame (), 0); | |
3430 | } | |
3431 | ||
3432 | ||
3433 | TUIDO (((TuiOpaqueFuncPtr) tui_vCheckDataValues, selected_frame)); | |
3434 | ||
3435 | done: | |
3436 | annotate_stopped (); | |
3437 | } | |
3438 | ||
3439 | static int | |
96baa820 | 3440 | hook_stop_stub (void *cmd) |
c906108c SS |
3441 | { |
3442 | execute_user_command ((struct cmd_list_element *) cmd, 0); | |
3443 | return (0); | |
3444 | } | |
3445 | \f | |
c5aa993b | 3446 | int |
96baa820 | 3447 | signal_stop_state (int signo) |
c906108c SS |
3448 | { |
3449 | return signal_stop[signo]; | |
3450 | } | |
3451 | ||
c5aa993b | 3452 | int |
96baa820 | 3453 | signal_print_state (int signo) |
c906108c SS |
3454 | { |
3455 | return signal_print[signo]; | |
3456 | } | |
3457 | ||
c5aa993b | 3458 | int |
96baa820 | 3459 | signal_pass_state (int signo) |
c906108c SS |
3460 | { |
3461 | return signal_program[signo]; | |
3462 | } | |
3463 | ||
d4f3574e SS |
3464 | int signal_stop_update (signo, state) |
3465 | int signo; | |
3466 | int state; | |
3467 | { | |
3468 | int ret = signal_stop[signo]; | |
3469 | signal_stop[signo] = state; | |
3470 | return ret; | |
3471 | } | |
3472 | ||
3473 | int signal_print_update (signo, state) | |
3474 | int signo; | |
3475 | int state; | |
3476 | { | |
3477 | int ret = signal_print[signo]; | |
3478 | signal_print[signo] = state; | |
3479 | return ret; | |
3480 | } | |
3481 | ||
3482 | int signal_pass_update (signo, state) | |
3483 | int signo; | |
3484 | int state; | |
3485 | { | |
3486 | int ret = signal_program[signo]; | |
3487 | signal_program[signo] = state; | |
3488 | return ret; | |
3489 | } | |
3490 | ||
c906108c | 3491 | static void |
96baa820 | 3492 | sig_print_header (void) |
c906108c SS |
3493 | { |
3494 | printf_filtered ("\ | |
3495 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3496 | } | |
3497 | ||
3498 | static void | |
96baa820 | 3499 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3500 | { |
3501 | char *name = target_signal_to_name (oursig); | |
3502 | int name_padding = 13 - strlen (name); | |
96baa820 | 3503 | |
c906108c SS |
3504 | if (name_padding <= 0) |
3505 | name_padding = 0; | |
3506 | ||
3507 | printf_filtered ("%s", name); | |
3508 | printf_filtered ("%*.*s ", name_padding, name_padding, | |
3509 | " "); | |
3510 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); | |
3511 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3512 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3513 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3514 | } | |
3515 | ||
3516 | /* Specify how various signals in the inferior should be handled. */ | |
3517 | ||
3518 | static void | |
96baa820 | 3519 | handle_command (char *args, int from_tty) |
c906108c SS |
3520 | { |
3521 | char **argv; | |
3522 | int digits, wordlen; | |
3523 | int sigfirst, signum, siglast; | |
3524 | enum target_signal oursig; | |
3525 | int allsigs; | |
3526 | int nsigs; | |
3527 | unsigned char *sigs; | |
3528 | struct cleanup *old_chain; | |
3529 | ||
3530 | if (args == NULL) | |
3531 | { | |
3532 | error_no_arg ("signal to handle"); | |
3533 | } | |
3534 | ||
3535 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3536 | ||
3537 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3538 | sigs = (unsigned char *) alloca (nsigs); | |
3539 | memset (sigs, 0, nsigs); | |
3540 | ||
3541 | /* Break the command line up into args. */ | |
3542 | ||
3543 | argv = buildargv (args); | |
3544 | if (argv == NULL) | |
3545 | { | |
3546 | nomem (0); | |
3547 | } | |
7a292a7a | 3548 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3549 | |
3550 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3551 | actions. Signal numbers and signal names may be interspersed with | |
3552 | actions, with the actions being performed for all signals cumulatively | |
3553 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3554 | ||
3555 | while (*argv != NULL) | |
3556 | { | |
3557 | wordlen = strlen (*argv); | |
3558 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3559 | {; | |
3560 | } | |
3561 | allsigs = 0; | |
3562 | sigfirst = siglast = -1; | |
3563 | ||
3564 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3565 | { | |
3566 | /* Apply action to all signals except those used by the | |
3567 | debugger. Silently skip those. */ | |
3568 | allsigs = 1; | |
3569 | sigfirst = 0; | |
3570 | siglast = nsigs - 1; | |
3571 | } | |
3572 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3573 | { | |
3574 | SET_SIGS (nsigs, sigs, signal_stop); | |
3575 | SET_SIGS (nsigs, sigs, signal_print); | |
3576 | } | |
3577 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3578 | { | |
3579 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3580 | } | |
3581 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3582 | { | |
3583 | SET_SIGS (nsigs, sigs, signal_print); | |
3584 | } | |
3585 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3586 | { | |
3587 | SET_SIGS (nsigs, sigs, signal_program); | |
3588 | } | |
3589 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3590 | { | |
3591 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3592 | } | |
3593 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3594 | { | |
3595 | SET_SIGS (nsigs, sigs, signal_program); | |
3596 | } | |
3597 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3598 | { | |
3599 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3600 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3601 | } | |
3602 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3603 | { | |
3604 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3605 | } | |
3606 | else if (digits > 0) | |
3607 | { | |
3608 | /* It is numeric. The numeric signal refers to our own | |
3609 | internal signal numbering from target.h, not to host/target | |
3610 | signal number. This is a feature; users really should be | |
3611 | using symbolic names anyway, and the common ones like | |
3612 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3613 | ||
3614 | sigfirst = siglast = (int) | |
3615 | target_signal_from_command (atoi (*argv)); | |
3616 | if ((*argv)[digits] == '-') | |
3617 | { | |
3618 | siglast = (int) | |
3619 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3620 | } | |
3621 | if (sigfirst > siglast) | |
3622 | { | |
3623 | /* Bet he didn't figure we'd think of this case... */ | |
3624 | signum = sigfirst; | |
3625 | sigfirst = siglast; | |
3626 | siglast = signum; | |
3627 | } | |
3628 | } | |
3629 | else | |
3630 | { | |
3631 | oursig = target_signal_from_name (*argv); | |
3632 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3633 | { | |
3634 | sigfirst = siglast = (int) oursig; | |
3635 | } | |
3636 | else | |
3637 | { | |
3638 | /* Not a number and not a recognized flag word => complain. */ | |
3639 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3640 | } | |
3641 | } | |
3642 | ||
3643 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3644 | which signals to apply actions to. */ |
c906108c SS |
3645 | |
3646 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3647 | { | |
3648 | switch ((enum target_signal) signum) | |
3649 | { | |
3650 | case TARGET_SIGNAL_TRAP: | |
3651 | case TARGET_SIGNAL_INT: | |
3652 | if (!allsigs && !sigs[signum]) | |
3653 | { | |
3654 | if (query ("%s is used by the debugger.\n\ | |
3655 | Are you sure you want to change it? ", | |
3656 | target_signal_to_name | |
3657 | ((enum target_signal) signum))) | |
3658 | { | |
3659 | sigs[signum] = 1; | |
3660 | } | |
3661 | else | |
3662 | { | |
3663 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3664 | gdb_flush (gdb_stdout); | |
3665 | } | |
3666 | } | |
3667 | break; | |
3668 | case TARGET_SIGNAL_0: | |
3669 | case TARGET_SIGNAL_DEFAULT: | |
3670 | case TARGET_SIGNAL_UNKNOWN: | |
3671 | /* Make sure that "all" doesn't print these. */ | |
3672 | break; | |
3673 | default: | |
3674 | sigs[signum] = 1; | |
3675 | break; | |
3676 | } | |
3677 | } | |
3678 | ||
3679 | argv++; | |
3680 | } | |
3681 | ||
3682 | target_notice_signals (inferior_pid); | |
3683 | ||
3684 | if (from_tty) | |
3685 | { | |
3686 | /* Show the results. */ | |
3687 | sig_print_header (); | |
3688 | for (signum = 0; signum < nsigs; signum++) | |
3689 | { | |
3690 | if (sigs[signum]) | |
3691 | { | |
3692 | sig_print_info (signum); | |
3693 | } | |
3694 | } | |
3695 | } | |
3696 | ||
3697 | do_cleanups (old_chain); | |
3698 | } | |
3699 | ||
3700 | static void | |
96baa820 | 3701 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3702 | { |
3703 | char **argv; | |
3704 | struct cleanup *old_chain; | |
3705 | ||
3706 | /* Break the command line up into args. */ | |
3707 | ||
3708 | argv = buildargv (args); | |
3709 | if (argv == NULL) | |
3710 | { | |
3711 | nomem (0); | |
3712 | } | |
7a292a7a | 3713 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3714 | if (argv[1] != (char *) NULL) |
3715 | { | |
3716 | char *argBuf; | |
3717 | int bufLen; | |
3718 | ||
3719 | bufLen = strlen (argv[0]) + 20; | |
3720 | argBuf = (char *) xmalloc (bufLen); | |
3721 | if (argBuf) | |
3722 | { | |
3723 | int validFlag = 1; | |
3724 | enum target_signal oursig; | |
3725 | ||
3726 | oursig = target_signal_from_name (argv[0]); | |
3727 | memset (argBuf, 0, bufLen); | |
3728 | if (strcmp (argv[1], "Q") == 0) | |
3729 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3730 | else | |
3731 | { | |
3732 | if (strcmp (argv[1], "s") == 0) | |
3733 | { | |
3734 | if (!signal_stop[oursig]) | |
3735 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3736 | else | |
3737 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3738 | } | |
3739 | else if (strcmp (argv[1], "i") == 0) | |
3740 | { | |
3741 | if (!signal_program[oursig]) | |
3742 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3743 | else | |
3744 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3745 | } | |
3746 | else if (strcmp (argv[1], "r") == 0) | |
3747 | { | |
3748 | if (!signal_print[oursig]) | |
3749 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3750 | else | |
3751 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3752 | } | |
3753 | else | |
3754 | validFlag = 0; | |
3755 | } | |
3756 | if (validFlag) | |
3757 | handle_command (argBuf, from_tty); | |
3758 | else | |
3759 | printf_filtered ("Invalid signal handling flag.\n"); | |
3760 | if (argBuf) | |
3761 | free (argBuf); | |
3762 | } | |
3763 | } | |
3764 | do_cleanups (old_chain); | |
3765 | } | |
3766 | ||
3767 | /* Print current contents of the tables set by the handle command. | |
3768 | It is possible we should just be printing signals actually used | |
3769 | by the current target (but for things to work right when switching | |
3770 | targets, all signals should be in the signal tables). */ | |
3771 | ||
3772 | static void | |
96baa820 | 3773 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3774 | { |
3775 | enum target_signal oursig; | |
3776 | sig_print_header (); | |
3777 | ||
3778 | if (signum_exp) | |
3779 | { | |
3780 | /* First see if this is a symbol name. */ | |
3781 | oursig = target_signal_from_name (signum_exp); | |
3782 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3783 | { | |
3784 | /* No, try numeric. */ | |
3785 | oursig = | |
3786 | target_signal_from_command (parse_and_eval_address (signum_exp)); | |
3787 | } | |
3788 | sig_print_info (oursig); | |
3789 | return; | |
3790 | } | |
3791 | ||
3792 | printf_filtered ("\n"); | |
3793 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3794 | for (oursig = TARGET_SIGNAL_FIRST; | |
3795 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3796 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3797 | { | |
3798 | QUIT; | |
3799 | ||
3800 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
3801 | && oursig != TARGET_SIGNAL_DEFAULT | |
3802 | && oursig != TARGET_SIGNAL_0) | |
3803 | sig_print_info (oursig); | |
3804 | } | |
3805 | ||
3806 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3807 | } | |
3808 | \f | |
7a292a7a SS |
3809 | struct inferior_status |
3810 | { | |
3811 | enum target_signal stop_signal; | |
3812 | CORE_ADDR stop_pc; | |
3813 | bpstat stop_bpstat; | |
3814 | int stop_step; | |
3815 | int stop_stack_dummy; | |
3816 | int stopped_by_random_signal; | |
3817 | int trap_expected; | |
3818 | CORE_ADDR step_range_start; | |
3819 | CORE_ADDR step_range_end; | |
3820 | CORE_ADDR step_frame_address; | |
3821 | int step_over_calls; | |
3822 | CORE_ADDR step_resume_break_address; | |
3823 | int stop_after_trap; | |
3824 | int stop_soon_quietly; | |
3825 | CORE_ADDR selected_frame_address; | |
3826 | char *stop_registers; | |
3827 | ||
3828 | /* These are here because if call_function_by_hand has written some | |
3829 | registers and then decides to call error(), we better not have changed | |
3830 | any registers. */ | |
3831 | char *registers; | |
3832 | ||
3833 | int selected_level; | |
3834 | int breakpoint_proceeded; | |
3835 | int restore_stack_info; | |
3836 | int proceed_to_finish; | |
3837 | }; | |
3838 | ||
7a292a7a | 3839 | static struct inferior_status * |
96baa820 | 3840 | xmalloc_inferior_status (void) |
7a292a7a SS |
3841 | { |
3842 | struct inferior_status *inf_status; | |
3843 | inf_status = xmalloc (sizeof (struct inferior_status)); | |
3844 | inf_status->stop_registers = xmalloc (REGISTER_BYTES); | |
3845 | inf_status->registers = xmalloc (REGISTER_BYTES); | |
3846 | return inf_status; | |
3847 | } | |
3848 | ||
7a292a7a | 3849 | static void |
96baa820 | 3850 | free_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3851 | { |
3852 | free (inf_status->registers); | |
3853 | free (inf_status->stop_registers); | |
3854 | free (inf_status); | |
3855 | } | |
3856 | ||
3857 | void | |
96baa820 JM |
3858 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3859 | LONGEST val) | |
7a292a7a | 3860 | { |
c5aa993b | 3861 | int size = REGISTER_RAW_SIZE (regno); |
7a292a7a SS |
3862 | void *buf = alloca (size); |
3863 | store_signed_integer (buf, size, val); | |
3864 | memcpy (&inf_status->registers[REGISTER_BYTE (regno)], buf, size); | |
3865 | } | |
3866 | ||
c906108c SS |
3867 | /* Save all of the information associated with the inferior<==>gdb |
3868 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3869 | (defined in inferior.h). */ | |
3870 | ||
7a292a7a | 3871 | struct inferior_status * |
96baa820 | 3872 | save_inferior_status (int restore_stack_info) |
c906108c | 3873 | { |
7a292a7a SS |
3874 | struct inferior_status *inf_status = xmalloc_inferior_status (); |
3875 | ||
c906108c SS |
3876 | inf_status->stop_signal = stop_signal; |
3877 | inf_status->stop_pc = stop_pc; | |
3878 | inf_status->stop_step = stop_step; | |
3879 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3880 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3881 | inf_status->trap_expected = trap_expected; | |
3882 | inf_status->step_range_start = step_range_start; | |
3883 | inf_status->step_range_end = step_range_end; | |
3884 | inf_status->step_frame_address = step_frame_address; | |
3885 | inf_status->step_over_calls = step_over_calls; | |
3886 | inf_status->stop_after_trap = stop_after_trap; | |
3887 | inf_status->stop_soon_quietly = stop_soon_quietly; | |
3888 | /* Save original bpstat chain here; replace it with copy of chain. | |
3889 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3890 | hand them back the original chain when restore_inferior_status is |
3891 | called. */ | |
c906108c SS |
3892 | inf_status->stop_bpstat = stop_bpstat; |
3893 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3894 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3895 | inf_status->restore_stack_info = restore_stack_info; | |
3896 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3897 | |
c906108c SS |
3898 | memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES); |
3899 | ||
3900 | read_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
3901 | ||
3902 | record_selected_frame (&(inf_status->selected_frame_address), | |
3903 | &(inf_status->selected_level)); | |
7a292a7a | 3904 | return inf_status; |
c906108c SS |
3905 | } |
3906 | ||
3907 | struct restore_selected_frame_args | |
3908 | { | |
3909 | CORE_ADDR frame_address; | |
3910 | int level; | |
3911 | }; | |
3912 | ||
c906108c | 3913 | static int |
96baa820 | 3914 | restore_selected_frame (void *args) |
c906108c SS |
3915 | { |
3916 | struct restore_selected_frame_args *fr = | |
3917 | (struct restore_selected_frame_args *) args; | |
3918 | struct frame_info *frame; | |
3919 | int level = fr->level; | |
3920 | ||
3921 | frame = find_relative_frame (get_current_frame (), &level); | |
3922 | ||
3923 | /* If inf_status->selected_frame_address is NULL, there was no | |
3924 | previously selected frame. */ | |
3925 | if (frame == NULL || | |
3926 | /* FRAME_FP (frame) != fr->frame_address || */ | |
3927 | /* elz: deleted this check as a quick fix to the problem that | |
c5aa993b JM |
3928 | for function called by hand gdb creates no internal frame |
3929 | structure and the real stack and gdb's idea of stack are | |
3930 | different if nested calls by hands are made. | |
c906108c | 3931 | |
c5aa993b | 3932 | mvs: this worries me. */ |
c906108c SS |
3933 | level != 0) |
3934 | { | |
3935 | warning ("Unable to restore previously selected frame.\n"); | |
3936 | return 0; | |
3937 | } | |
3938 | ||
3939 | select_frame (frame, fr->level); | |
3940 | ||
3941 | return (1); | |
3942 | } | |
3943 | ||
3944 | void | |
96baa820 | 3945 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3946 | { |
3947 | stop_signal = inf_status->stop_signal; | |
3948 | stop_pc = inf_status->stop_pc; | |
3949 | stop_step = inf_status->stop_step; | |
3950 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3951 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3952 | trap_expected = inf_status->trap_expected; | |
3953 | step_range_start = inf_status->step_range_start; | |
3954 | step_range_end = inf_status->step_range_end; | |
3955 | step_frame_address = inf_status->step_frame_address; | |
3956 | step_over_calls = inf_status->step_over_calls; | |
3957 | stop_after_trap = inf_status->stop_after_trap; | |
3958 | stop_soon_quietly = inf_status->stop_soon_quietly; | |
3959 | bpstat_clear (&stop_bpstat); | |
3960 | stop_bpstat = inf_status->stop_bpstat; | |
3961 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3962 | proceed_to_finish = inf_status->proceed_to_finish; | |
3963 | ||
7a292a7a | 3964 | /* FIXME: Is the restore of stop_registers always needed */ |
c906108c SS |
3965 | memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES); |
3966 | ||
3967 | /* The inferior can be gone if the user types "print exit(0)" | |
3968 | (and perhaps other times). */ | |
3969 | if (target_has_execution) | |
3970 | write_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
3971 | ||
c906108c SS |
3972 | /* FIXME: If we are being called after stopping in a function which |
3973 | is called from gdb, we should not be trying to restore the | |
3974 | selected frame; it just prints a spurious error message (The | |
3975 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3976 | clobbers the stack)). In fact, should we be restoring the | |
3977 | inferior status at all in that case? . */ | |
3978 | ||
3979 | if (target_has_stack && inf_status->restore_stack_info) | |
3980 | { | |
3981 | struct restore_selected_frame_args fr; | |
3982 | fr.level = inf_status->selected_level; | |
3983 | fr.frame_address = inf_status->selected_frame_address; | |
3984 | /* The point of catch_errors is that if the stack is clobbered, | |
c5aa993b JM |
3985 | walking the stack might encounter a garbage pointer and error() |
3986 | trying to dereference it. */ | |
c906108c SS |
3987 | if (catch_errors (restore_selected_frame, &fr, |
3988 | "Unable to restore previously selected frame:\n", | |
3989 | RETURN_MASK_ERROR) == 0) | |
3990 | /* Error in restoring the selected frame. Select the innermost | |
3991 | frame. */ | |
3992 | ||
3993 | ||
3994 | select_frame (get_current_frame (), 0); | |
3995 | ||
3996 | } | |
c906108c | 3997 | |
7a292a7a SS |
3998 | free_inferior_status (inf_status); |
3999 | } | |
c906108c SS |
4000 | |
4001 | void | |
96baa820 | 4002 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
4003 | { |
4004 | /* See save_inferior_status for info on stop_bpstat. */ | |
4005 | bpstat_clear (&inf_status->stop_bpstat); | |
4006 | free_inferior_status (inf_status); | |
4007 | } | |
4008 | ||
4009 | static void | |
96baa820 JM |
4010 | set_follow_fork_mode_command (char *arg, int from_tty, |
4011 | struct cmd_list_element *c) | |
c906108c SS |
4012 | { |
4013 | if (!STREQ (arg, "parent") && | |
4014 | !STREQ (arg, "child") && | |
4015 | !STREQ (arg, "both") && | |
4016 | !STREQ (arg, "ask")) | |
4017 | error ("follow-fork-mode must be one of \"parent\", \"child\", \"both\" or \"ask\"."); | |
4018 | ||
4019 | if (follow_fork_mode_string != NULL) | |
4020 | free (follow_fork_mode_string); | |
4021 | follow_fork_mode_string = savestring (arg, strlen (arg)); | |
4022 | } | |
c5aa993b | 4023 | \f |
7a292a7a | 4024 | static void |
96baa820 | 4025 | build_infrun (void) |
7a292a7a SS |
4026 | { |
4027 | stop_registers = xmalloc (REGISTER_BYTES); | |
4028 | } | |
c906108c | 4029 | |
c906108c | 4030 | void |
96baa820 | 4031 | _initialize_infrun (void) |
c906108c SS |
4032 | { |
4033 | register int i; | |
4034 | register int numsigs; | |
4035 | struct cmd_list_element *c; | |
4036 | ||
7a292a7a SS |
4037 | build_infrun (); |
4038 | ||
0f71a2f6 JM |
4039 | register_gdbarch_swap (&stop_registers, sizeof (stop_registers), NULL); |
4040 | register_gdbarch_swap (NULL, 0, build_infrun); | |
4041 | ||
c906108c SS |
4042 | add_info ("signals", signals_info, |
4043 | "What debugger does when program gets various signals.\n\ | |
4044 | Specify a signal as argument to print info on that signal only."); | |
4045 | add_info_alias ("handle", "signals", 0); | |
4046 | ||
4047 | add_com ("handle", class_run, handle_command, | |
4048 | concat ("Specify how to handle a signal.\n\ | |
4049 | Args are signals and actions to apply to those signals.\n\ | |
4050 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
4051 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
4052 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
4053 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
4054 | used by the debugger, typically SIGTRAP and SIGINT.\n", | |
4055 | "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
4056 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ | |
4057 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
4058 | Print means print a message if this signal happens.\n\ | |
4059 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
4060 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
4061 | Pass and Stop may be combined.", NULL)); | |
4062 | if (xdb_commands) | |
4063 | { | |
4064 | add_com ("lz", class_info, signals_info, | |
4065 | "What debugger does when program gets various signals.\n\ | |
4066 | Specify a signal as argument to print info on that signal only."); | |
4067 | add_com ("z", class_run, xdb_handle_command, | |
4068 | concat ("Specify how to handle a signal.\n\ | |
4069 | Args are signals and actions to apply to those signals.\n\ | |
4070 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
4071 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
4072 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
4073 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
4074 | used by the debugger, typically SIGTRAP and SIGINT.\n", | |
4075 | "Recognized actions include \"s\" (toggles between stop and nostop), \n\ | |
4076 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ | |
4077 | nopass), \"Q\" (noprint)\n\ | |
4078 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
4079 | Print means print a message if this signal happens.\n\ | |
4080 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
4081 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
4082 | Pass and Stop may be combined.", NULL)); | |
4083 | } | |
4084 | ||
4085 | if (!dbx_commands) | |
4086 | stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command, | |
4087 | "There is no `stop' command, but you can set a hook on `stop'.\n\ | |
4088 | This allows you to set a list of commands to be run each time execution\n\ | |
4089 | of the program stops.", &cmdlist); | |
4090 | ||
4091 | numsigs = (int) TARGET_SIGNAL_LAST; | |
4092 | signal_stop = (unsigned char *) | |
4093 | xmalloc (sizeof (signal_stop[0]) * numsigs); | |
4094 | signal_print = (unsigned char *) | |
4095 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
4096 | signal_program = (unsigned char *) | |
4097 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
4098 | for (i = 0; i < numsigs; i++) | |
4099 | { | |
4100 | signal_stop[i] = 1; | |
4101 | signal_print[i] = 1; | |
4102 | signal_program[i] = 1; | |
4103 | } | |
4104 | ||
4105 | /* Signals caused by debugger's own actions | |
4106 | should not be given to the program afterwards. */ | |
4107 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
4108 | signal_program[TARGET_SIGNAL_INT] = 0; | |
4109 | ||
4110 | /* Signals that are not errors should not normally enter the debugger. */ | |
4111 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
4112 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
4113 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
4114 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
4115 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
4116 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
4117 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
4118 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
4119 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
4120 | signal_print[TARGET_SIGNAL_IO] = 0; | |
4121 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
4122 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
4123 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
4124 | signal_print[TARGET_SIGNAL_URG] = 0; | |
4125 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
4126 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
4127 | ||
cd0fc7c3 SS |
4128 | /* These signals are used internally by user-level thread |
4129 | implementations. (See signal(5) on Solaris.) Like the above | |
4130 | signals, a healthy program receives and handles them as part of | |
4131 | its normal operation. */ | |
4132 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
4133 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
4134 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
4135 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
4136 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
4137 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
4138 | ||
c906108c SS |
4139 | #ifdef SOLIB_ADD |
4140 | add_show_from_set | |
4141 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, | |
4142 | (char *) &stop_on_solib_events, | |
4143 | "Set stopping for shared library events.\n\ | |
4144 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
4145 | notifies gdb of shared library events. The most common event of interest\n\ | |
4146 | to the user would be loading/unloading of a new library.\n", | |
4147 | &setlist), | |
4148 | &showlist); | |
4149 | #endif | |
4150 | ||
4151 | c = add_set_enum_cmd ("follow-fork-mode", | |
4152 | class_run, | |
4153 | follow_fork_mode_kind_names, | |
4154 | (char *) &follow_fork_mode_string, | |
4155 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 | |
4156 | kernel problem. It's also not terribly useful without a GUI to | |
4157 | help the user drive two debuggers. So for now, I'm disabling | |
4158 | the "both" option. */ | |
c5aa993b JM |
4159 | /* "Set debugger response to a program call of fork \ |
4160 | or vfork.\n\ | |
4161 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
4162 | parent - the original process is debugged after a fork\n\ | |
4163 | child - the new process is debugged after a fork\n\ | |
4164 | both - both the parent and child are debugged after a fork\n\ | |
4165 | ask - the debugger will ask for one of the above choices\n\ | |
4166 | For \"both\", another copy of the debugger will be started to follow\n\ | |
4167 | the new child process. The original debugger will continue to follow\n\ | |
4168 | the original parent process. To distinguish their prompts, the\n\ | |
4169 | debugger copy's prompt will be changed.\n\ | |
4170 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
4171 | By default, the debugger will follow the parent process.", | |
4172 | */ | |
c906108c SS |
4173 | "Set debugger response to a program call of fork \ |
4174 | or vfork.\n\ | |
4175 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
4176 | parent - the original process is debugged after a fork\n\ | |
4177 | child - the new process is debugged after a fork\n\ | |
4178 | ask - the debugger will ask for one of the above choices\n\ | |
4179 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
4180 | By default, the debugger will follow the parent process.", | |
4181 | &setlist); | |
c5aa993b | 4182 | /* c->function.sfunc = ; */ |
c906108c SS |
4183 | add_show_from_set (c, &showlist); |
4184 | ||
4185 | set_follow_fork_mode_command ("parent", 0, NULL); | |
4186 | ||
4187 | c = add_set_enum_cmd ("scheduler-locking", class_run, | |
4188 | scheduler_enums, /* array of string names */ | |
4189 | (char *) &scheduler_mode, /* current mode */ | |
4190 | "Set mode for locking scheduler during execution.\n\ | |
4191 | off == no locking (threads may preempt at any time)\n\ | |
4192 | on == full locking (no thread except the current thread may run)\n\ | |
4193 | step == scheduler locked during every single-step operation.\n\ | |
4194 | In this mode, no other thread may run during a step command.\n\ | |
4195 | Other threads may run while stepping over a function call ('next').", | |
4196 | &setlist); | |
4197 | ||
4198 | c->function.sfunc = set_schedlock_func; /* traps on target vector */ | |
4199 | add_show_from_set (c, &showlist); | |
4200 | } |