Commit | Line | Data |
---|---|---|
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 | ||
c906108c | 95 | static int switched_from_inferior_pid; |
7a292a7a SS |
96 | |
97 | /* This will be true for configurations that may actually report an | |
98 | inferior pid different from the original. At present this is only | |
99 | true for HP-UX native. */ | |
100 | ||
101 | #ifndef MAY_SWITCH_FROM_INFERIOR_PID | |
102 | #define MAY_SWITCH_FROM_INFERIOR_PID (0) | |
103 | #endif | |
104 | ||
105 | static int may_switch_from_inferior_pid = MAY_SWITCH_FROM_INFERIOR_PID; | |
106 | ||
107 | /* This is true for configurations that may follow through execl() and | |
108 | similar functions. At present this is only true for HP-UX native. */ | |
109 | ||
110 | #ifndef MAY_FOLLOW_EXEC | |
111 | #define MAY_FOLLOW_EXEC (0) | |
c906108c SS |
112 | #endif |
113 | ||
7a292a7a SS |
114 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
115 | ||
c906108c SS |
116 | /* resume and wait_for_inferior use this to ensure that when |
117 | stepping over a hit breakpoint in a threaded application | |
118 | only the thread that hit the breakpoint is stepped and the | |
119 | other threads don't continue. This prevents having another | |
120 | thread run past the breakpoint while it is temporarily | |
121 | removed. | |
122 | ||
123 | This is not thread-specific, so it isn't saved as part of | |
124 | the infrun state. | |
125 | ||
126 | Versions of gdb which don't use the "step == this thread steps | |
127 | and others continue" model but instead use the "step == this | |
96baa820 JM |
128 | thread steps and others wait" shouldn't do this. */ |
129 | ||
c906108c SS |
130 | static int thread_step_needed = 0; |
131 | ||
7a292a7a SS |
132 | /* This is true if thread_step_needed should actually be used. At |
133 | present this is only true for HP-UX native. */ | |
134 | ||
135 | #ifndef USE_THREAD_STEP_NEEDED | |
136 | #define USE_THREAD_STEP_NEEDED (0) | |
137 | #endif | |
138 | ||
139 | static int use_thread_step_needed = USE_THREAD_STEP_NEEDED; | |
140 | ||
c906108c SS |
141 | /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the |
142 | program. It needs to examine the jmp_buf argument and extract the PC | |
143 | from it. The return value is non-zero on success, zero otherwise. */ | |
144 | ||
145 | #ifndef GET_LONGJMP_TARGET | |
146 | #define GET_LONGJMP_TARGET(PC_ADDR) 0 | |
147 | #endif | |
148 | ||
149 | ||
150 | /* Some machines have trampoline code that sits between function callers | |
151 | and the actual functions themselves. If this machine doesn't have | |
152 | such things, disable their processing. */ | |
153 | ||
154 | #ifndef SKIP_TRAMPOLINE_CODE | |
155 | #define SKIP_TRAMPOLINE_CODE(pc) 0 | |
156 | #endif | |
157 | ||
158 | /* Dynamic function trampolines are similar to solib trampolines in that they | |
159 | are between the caller and the callee. The difference is that when you | |
160 | enter a dynamic trampoline, you can't determine the callee's address. Some | |
161 | (usually complex) code needs to run in the dynamic trampoline to figure out | |
162 | the callee's address. This macro is usually called twice. First, when we | |
163 | enter the trampoline (looks like a normal function call at that point). It | |
164 | should return the PC of a point within the trampoline where the callee's | |
165 | address is known. Second, when we hit the breakpoint, this routine returns | |
166 | the callee's address. At that point, things proceed as per a step resume | |
167 | breakpoint. */ | |
168 | ||
169 | #ifndef DYNAMIC_TRAMPOLINE_NEXTPC | |
170 | #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0 | |
171 | #endif | |
172 | ||
d4f3574e SS |
173 | /* If the program uses ELF-style shared libraries, then calls to |
174 | functions in shared libraries go through stubs, which live in a | |
175 | table called the PLT (Procedure Linkage Table). The first time the | |
176 | function is called, the stub sends control to the dynamic linker, | |
177 | which looks up the function's real address, patches the stub so | |
178 | that future calls will go directly to the function, and then passes | |
179 | control to the function. | |
180 | ||
181 | If we are stepping at the source level, we don't want to see any of | |
182 | this --- we just want to skip over the stub and the dynamic linker. | |
183 | The simple approach is to single-step until control leaves the | |
184 | dynamic linker. | |
185 | ||
186 | However, on some systems (e.g., Red Hat Linux 5.2) the dynamic | |
187 | linker calls functions in the shared C library, so you can't tell | |
188 | from the PC alone whether the dynamic linker is still running. In | |
189 | this case, we use a step-resume breakpoint to get us past the | |
190 | dynamic linker, as if we were using "next" to step over a function | |
191 | call. | |
192 | ||
193 | IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic | |
194 | linker code or not. Normally, this means we single-step. However, | |
195 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
196 | address where we can place a step-resume breakpoint to get past the | |
197 | linker's symbol resolution function. | |
198 | ||
199 | IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a | |
200 | pretty portable way, by comparing the PC against the address ranges | |
201 | of the dynamic linker's sections. | |
202 | ||
203 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
204 | it depends on internal details of the dynamic linker. It's usually | |
205 | not too hard to figure out where to put a breakpoint, but it | |
206 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
207 | sanity checking. If it can't figure things out, returning zero and | |
208 | getting the (possibly confusing) stepping behavior is better than | |
209 | signalling an error, which will obscure the change in the | |
210 | inferior's state. */ | |
c906108c SS |
211 | |
212 | #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
213 | #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 | |
214 | #endif | |
215 | ||
d4f3574e SS |
216 | #ifndef SKIP_SOLIB_RESOLVER |
217 | #define SKIP_SOLIB_RESOLVER(pc) 0 | |
218 | #endif | |
219 | ||
c906108c SS |
220 | /* For SVR4 shared libraries, each call goes through a small piece of |
221 | trampoline code in the ".plt" section. IN_SOLIB_CALL_TRAMPOLINE evaluates | |
222 | to nonzero if we are current stopped in one of these. */ | |
223 | ||
224 | #ifndef IN_SOLIB_CALL_TRAMPOLINE | |
225 | #define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0 | |
226 | #endif | |
227 | ||
228 | /* In some shared library schemes, the return path from a shared library | |
229 | call may need to go through a trampoline too. */ | |
230 | ||
231 | #ifndef IN_SOLIB_RETURN_TRAMPOLINE | |
232 | #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0 | |
233 | #endif | |
234 | ||
235 | /* This function returns TRUE if pc is the address of an instruction | |
236 | that lies within the dynamic linker (such as the event hook, or the | |
237 | dld itself). | |
238 | ||
239 | This function must be used only when a dynamic linker event has | |
240 | been caught, and the inferior is being stepped out of the hook, or | |
241 | undefined results are guaranteed. */ | |
242 | ||
243 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
244 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
245 | #endif | |
246 | ||
247 | /* On MIPS16, a function that returns a floating point value may call | |
248 | a library helper function to copy the return value to a floating point | |
249 | register. The IGNORE_HELPER_CALL macro returns non-zero if we | |
250 | should ignore (i.e. step over) this function call. */ | |
251 | #ifndef IGNORE_HELPER_CALL | |
252 | #define IGNORE_HELPER_CALL(pc) 0 | |
253 | #endif | |
254 | ||
255 | /* On some systems, the PC may be left pointing at an instruction that won't | |
256 | actually be executed. This is usually indicated by a bit in the PSW. If | |
257 | we find ourselves in such a state, then we step the target beyond the | |
258 | nullified instruction before returning control to the user so as to avoid | |
259 | confusion. */ | |
260 | ||
261 | #ifndef INSTRUCTION_NULLIFIED | |
262 | #define INSTRUCTION_NULLIFIED 0 | |
263 | #endif | |
264 | ||
c2c6d25f JM |
265 | /* We can't step off a permanent breakpoint in the ordinary way, because we |
266 | can't remove it. Instead, we have to advance the PC to the next | |
267 | instruction. This macro should expand to a pointer to a function that | |
268 | does that, or zero if we have no such function. If we don't have a | |
269 | definition for it, we have to report an error. */ | |
270 | #ifndef SKIP_PERMANENT_BREAKPOINT | |
271 | #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint) | |
272 | static void | |
c2d11a7d | 273 | default_skip_permanent_breakpoint (void) |
c2c6d25f JM |
274 | { |
275 | error_begin (); | |
276 | fprintf_filtered (gdb_stderr, "\ | |
277 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
278 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
279 | a command like `return' or `jump' to continue execution.\n"); | |
280 | return_to_top_level (RETURN_ERROR); | |
281 | } | |
282 | #endif | |
283 | ||
284 | ||
7a292a7a SS |
285 | /* Convert the #defines into values. This is temporary until wfi control |
286 | flow is completely sorted out. */ | |
287 | ||
288 | #ifndef HAVE_STEPPABLE_WATCHPOINT | |
289 | #define HAVE_STEPPABLE_WATCHPOINT 0 | |
290 | #else | |
291 | #undef HAVE_STEPPABLE_WATCHPOINT | |
292 | #define HAVE_STEPPABLE_WATCHPOINT 1 | |
293 | #endif | |
294 | ||
295 | #ifndef HAVE_NONSTEPPABLE_WATCHPOINT | |
296 | #define HAVE_NONSTEPPABLE_WATCHPOINT 0 | |
297 | #else | |
298 | #undef HAVE_NONSTEPPABLE_WATCHPOINT | |
299 | #define HAVE_NONSTEPPABLE_WATCHPOINT 1 | |
300 | #endif | |
301 | ||
302 | #ifndef HAVE_CONTINUABLE_WATCHPOINT | |
303 | #define HAVE_CONTINUABLE_WATCHPOINT 0 | |
304 | #else | |
305 | #undef HAVE_CONTINUABLE_WATCHPOINT | |
306 | #define HAVE_CONTINUABLE_WATCHPOINT 1 | |
307 | #endif | |
308 | ||
c906108c SS |
309 | /* Tables of how to react to signals; the user sets them. */ |
310 | ||
311 | static unsigned char *signal_stop; | |
312 | static unsigned char *signal_print; | |
313 | static unsigned char *signal_program; | |
314 | ||
315 | #define SET_SIGS(nsigs,sigs,flags) \ | |
316 | do { \ | |
317 | int signum = (nsigs); \ | |
318 | while (signum-- > 0) \ | |
319 | if ((sigs)[signum]) \ | |
320 | (flags)[signum] = 1; \ | |
321 | } while (0) | |
322 | ||
323 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
324 | do { \ | |
325 | int signum = (nsigs); \ | |
326 | while (signum-- > 0) \ | |
327 | if ((sigs)[signum]) \ | |
328 | (flags)[signum] = 0; \ | |
329 | } while (0) | |
330 | ||
331 | ||
332 | /* Command list pointer for the "stop" placeholder. */ | |
333 | ||
334 | static struct cmd_list_element *stop_command; | |
335 | ||
336 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
337 | ||
338 | static int breakpoints_inserted; | |
339 | ||
340 | /* Function inferior was in as of last step command. */ | |
341 | ||
342 | static struct symbol *step_start_function; | |
343 | ||
344 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
345 | ||
346 | static int trap_expected; | |
347 | ||
348 | #ifdef SOLIB_ADD | |
349 | /* Nonzero if we want to give control to the user when we're notified | |
350 | of shared library events by the dynamic linker. */ | |
351 | static int stop_on_solib_events; | |
352 | #endif | |
353 | ||
354 | #ifdef HP_OS_BUG | |
355 | /* Nonzero if the next time we try to continue the inferior, it will | |
356 | step one instruction and generate a spurious trace trap. | |
357 | This is used to compensate for a bug in HP-UX. */ | |
358 | ||
359 | static int trap_expected_after_continue; | |
360 | #endif | |
361 | ||
362 | /* Nonzero means expecting a trace trap | |
363 | and should stop the inferior and return silently when it happens. */ | |
364 | ||
365 | int stop_after_trap; | |
366 | ||
367 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
368 | It is used after attach, due to attaching to a process; | |
369 | when running in the shell before the child program has been exec'd; | |
370 | and when running some kinds of remote stuff (FIXME?). */ | |
371 | ||
372 | int stop_soon_quietly; | |
373 | ||
374 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
375 | situation when stop_registers should be saved. */ | |
376 | ||
377 | int proceed_to_finish; | |
378 | ||
379 | /* Save register contents here when about to pop a stack dummy frame, | |
380 | if-and-only-if proceed_to_finish is set. | |
381 | Thus this contains the return value from the called function (assuming | |
382 | values are returned in a register). */ | |
383 | ||
7a292a7a | 384 | char *stop_registers; |
c906108c SS |
385 | |
386 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
387 | ||
388 | static int breakpoints_failed; | |
389 | ||
390 | /* Nonzero after stop if current stack frame should be printed. */ | |
391 | ||
392 | static int stop_print_frame; | |
393 | ||
394 | static struct breakpoint *step_resume_breakpoint = NULL; | |
395 | static struct breakpoint *through_sigtramp_breakpoint = NULL; | |
396 | ||
397 | /* On some platforms (e.g., HP-UX), hardware watchpoints have bad | |
398 | interactions with an inferior that is running a kernel function | |
399 | (aka, a system call or "syscall"). wait_for_inferior therefore | |
400 | may have a need to know when the inferior is in a syscall. This | |
401 | is a count of the number of inferior threads which are known to | |
402 | currently be running in a syscall. */ | |
403 | static int number_of_threads_in_syscalls; | |
404 | ||
405 | /* This is used to remember when a fork, vfork or exec event | |
406 | was caught by a catchpoint, and thus the event is to be | |
407 | followed at the next resume of the inferior, and not | |
408 | immediately. */ | |
409 | static struct | |
410 | { | |
411 | enum target_waitkind kind; | |
412 | struct | |
413 | { | |
414 | int parent_pid; | |
415 | int saw_parent_fork; | |
416 | int child_pid; | |
417 | int saw_child_fork; | |
418 | int saw_child_exec; | |
419 | } | |
420 | fork_event; | |
421 | char *execd_pathname; | |
422 | } | |
423 | pending_follow; | |
424 | ||
425 | /* Some platforms don't allow us to do anything meaningful with a | |
426 | vforked child until it has exec'd. Vforked processes on such | |
427 | platforms can only be followed after they've exec'd. | |
428 | ||
429 | When this is set to 0, a vfork can be immediately followed, | |
430 | and an exec can be followed merely as an exec. When this is | |
431 | set to 1, a vfork event has been seen, but cannot be followed | |
432 | until the exec is seen. | |
433 | ||
434 | (In the latter case, inferior_pid is still the parent of the | |
435 | vfork, and pending_follow.fork_event.child_pid is the child. The | |
436 | appropriate process is followed, according to the setting of | |
437 | follow-fork-mode.) */ | |
438 | static int follow_vfork_when_exec; | |
439 | ||
440 | static char *follow_fork_mode_kind_names[] = | |
441 | { | |
442 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 | |
443 | kernel problem. It's also not terribly useful without a GUI to | |
444 | help the user drive two debuggers. So for now, I'm disabling | |
445 | the "both" option. | |
c5aa993b JM |
446 | "parent", "child", "both", "ask" }; |
447 | */ | |
c906108c SS |
448 | "parent", "child", "ask"}; |
449 | ||
450 | static char *follow_fork_mode_string = NULL; | |
451 | \f | |
452 | ||
c906108c | 453 | static void |
96baa820 JM |
454 | follow_inferior_fork (int parent_pid, int child_pid, int has_forked, |
455 | int has_vforked) | |
c906108c SS |
456 | { |
457 | int followed_parent = 0; | |
458 | int followed_child = 0; | |
c906108c SS |
459 | |
460 | /* Which process did the user want us to follow? */ | |
461 | char *follow_mode = | |
96baa820 | 462 | savestring (follow_fork_mode_string, strlen (follow_fork_mode_string)); |
c906108c SS |
463 | |
464 | /* Or, did the user not know, and want us to ask? */ | |
465 | if (STREQ (follow_fork_mode_string, "ask")) | |
466 | { | |
467 | char requested_mode[100]; | |
468 | ||
469 | free (follow_mode); | |
470 | error ("\"ask\" mode NYI"); | |
471 | follow_mode = savestring (requested_mode, strlen (requested_mode)); | |
472 | } | |
473 | ||
474 | /* If we're to be following the parent, then detach from child_pid. | |
475 | We're already following the parent, so need do nothing explicit | |
476 | for it. */ | |
477 | if (STREQ (follow_mode, "parent")) | |
478 | { | |
479 | followed_parent = 1; | |
480 | ||
481 | /* We're already attached to the parent, by default. */ | |
482 | ||
483 | /* Before detaching from the child, remove all breakpoints from | |
484 | it. (This won't actually modify the breakpoint list, but will | |
485 | physically remove the breakpoints from the child.) */ | |
486 | if (!has_vforked || !follow_vfork_when_exec) | |
487 | { | |
488 | detach_breakpoints (child_pid); | |
7a292a7a | 489 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
c906108c | 490 | SOLIB_REMOVE_INFERIOR_HOOK (child_pid); |
7a292a7a | 491 | #endif |
c906108c SS |
492 | } |
493 | ||
494 | /* Detach from the child. */ | |
495 | dont_repeat (); | |
496 | ||
497 | target_require_detach (child_pid, "", 1); | |
498 | } | |
499 | ||
500 | /* If we're to be following the child, then attach to it, detach | |
501 | from inferior_pid, and set inferior_pid to child_pid. */ | |
502 | else if (STREQ (follow_mode, "child")) | |
503 | { | |
504 | char child_pid_spelling[100]; /* Arbitrary length. */ | |
505 | ||
506 | followed_child = 1; | |
507 | ||
508 | /* Before detaching from the parent, detach all breakpoints from | |
509 | the child. But only if we're forking, or if we follow vforks | |
510 | as soon as they happen. (If we're following vforks only when | |
511 | the child has exec'd, then it's very wrong to try to write | |
512 | back the "shadow contents" of inserted breakpoints now -- they | |
513 | belong to the child's pre-exec'd a.out.) */ | |
514 | if (!has_vforked || !follow_vfork_when_exec) | |
515 | { | |
516 | detach_breakpoints (child_pid); | |
517 | } | |
518 | ||
519 | /* Before detaching from the parent, remove all breakpoints from it. */ | |
520 | remove_breakpoints (); | |
521 | ||
522 | /* Also reset the solib inferior hook from the parent. */ | |
7a292a7a | 523 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
c906108c | 524 | SOLIB_REMOVE_INFERIOR_HOOK (inferior_pid); |
7a292a7a | 525 | #endif |
c906108c SS |
526 | |
527 | /* Detach from the parent. */ | |
528 | dont_repeat (); | |
529 | target_detach (NULL, 1); | |
530 | ||
531 | /* Attach to the child. */ | |
532 | inferior_pid = child_pid; | |
533 | sprintf (child_pid_spelling, "%d", child_pid); | |
534 | dont_repeat (); | |
535 | ||
536 | target_require_attach (child_pid_spelling, 1); | |
537 | ||
538 | /* Was there a step_resume breakpoint? (There was if the user | |
539 | did a "next" at the fork() call.) If so, explicitly reset its | |
540 | thread number. | |
541 | ||
542 | step_resumes are a form of bp that are made to be per-thread. | |
543 | Since we created the step_resume bp when the parent process | |
544 | was being debugged, and now are switching to the child process, | |
545 | from the breakpoint package's viewpoint, that's a switch of | |
546 | "threads". We must update the bp's notion of which thread | |
547 | it is for, or it'll be ignored when it triggers... */ | |
548 | if (step_resume_breakpoint && | |
549 | (!has_vforked || !follow_vfork_when_exec)) | |
550 | breakpoint_re_set_thread (step_resume_breakpoint); | |
551 | ||
552 | /* Reinsert all breakpoints in the child. (The user may've set | |
553 | breakpoints after catching the fork, in which case those | |
554 | actually didn't get set in the child, but only in the parent.) */ | |
555 | if (!has_vforked || !follow_vfork_when_exec) | |
556 | { | |
557 | breakpoint_re_set (); | |
558 | insert_breakpoints (); | |
559 | } | |
560 | } | |
561 | ||
562 | /* If we're to be following both parent and child, then fork ourselves, | |
563 | and attach the debugger clone to the child. */ | |
564 | else if (STREQ (follow_mode, "both")) | |
565 | { | |
566 | char pid_suffix[100]; /* Arbitrary length. */ | |
567 | ||
568 | /* Clone ourselves to follow the child. This is the end of our | |
c5aa993b | 569 | involvement with child_pid; our clone will take it from here... */ |
c906108c SS |
570 | dont_repeat (); |
571 | target_clone_and_follow_inferior (child_pid, &followed_child); | |
572 | followed_parent = !followed_child; | |
573 | ||
574 | /* We continue to follow the parent. To help distinguish the two | |
575 | debuggers, though, both we and our clone will reset our prompts. */ | |
576 | sprintf (pid_suffix, "[%d] ", inferior_pid); | |
577 | set_prompt (strcat (get_prompt (), pid_suffix)); | |
578 | } | |
579 | ||
580 | /* The parent and child of a vfork share the same address space. | |
581 | Also, on some targets the order in which vfork and exec events | |
582 | are received for parent in child requires some delicate handling | |
583 | of the events. | |
584 | ||
585 | For instance, on ptrace-based HPUX we receive the child's vfork | |
586 | event first, at which time the parent has been suspended by the | |
587 | OS and is essentially untouchable until the child's exit or second | |
588 | exec event arrives. At that time, the parent's vfork event is | |
589 | delivered to us, and that's when we see and decide how to follow | |
590 | the vfork. But to get to that point, we must continue the child | |
591 | until it execs or exits. To do that smoothly, all breakpoints | |
592 | must be removed from the child, in case there are any set between | |
593 | the vfork() and exec() calls. But removing them from the child | |
594 | also removes them from the parent, due to the shared-address-space | |
595 | nature of a vfork'd parent and child. On HPUX, therefore, we must | |
596 | take care to restore the bp's to the parent before we continue it. | |
597 | Else, it's likely that we may not stop in the expected place. (The | |
598 | worst scenario is when the user tries to step over a vfork() call; | |
599 | the step-resume bp must be restored for the step to properly stop | |
600 | in the parent after the call completes!) | |
601 | ||
602 | Sequence of events, as reported to gdb from HPUX: | |
603 | ||
c5aa993b JM |
604 | Parent Child Action for gdb to take |
605 | ------------------------------------------------------- | |
606 | 1 VFORK Continue child | |
607 | 2 EXEC | |
608 | 3 EXEC or EXIT | |
609 | 4 VFORK */ | |
c906108c SS |
610 | if (has_vforked) |
611 | { | |
612 | target_post_follow_vfork (parent_pid, | |
613 | followed_parent, | |
614 | child_pid, | |
615 | followed_child); | |
616 | } | |
617 | ||
618 | pending_follow.fork_event.saw_parent_fork = 0; | |
619 | pending_follow.fork_event.saw_child_fork = 0; | |
620 | ||
621 | free (follow_mode); | |
622 | } | |
623 | ||
624 | static void | |
96baa820 | 625 | follow_fork (int parent_pid, int child_pid) |
c906108c SS |
626 | { |
627 | follow_inferior_fork (parent_pid, child_pid, 1, 0); | |
628 | } | |
629 | ||
630 | ||
631 | /* Forward declaration. */ | |
96baa820 | 632 | static void follow_exec (int, char *); |
c906108c SS |
633 | |
634 | static void | |
96baa820 | 635 | follow_vfork (int parent_pid, int child_pid) |
c906108c SS |
636 | { |
637 | follow_inferior_fork (parent_pid, child_pid, 0, 1); | |
638 | ||
639 | /* Did we follow the child? Had it exec'd before we saw the parent vfork? */ | |
640 | if (pending_follow.fork_event.saw_child_exec && (inferior_pid == child_pid)) | |
641 | { | |
642 | pending_follow.fork_event.saw_child_exec = 0; | |
643 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
644 | follow_exec (inferior_pid, pending_follow.execd_pathname); | |
645 | free (pending_follow.execd_pathname); | |
646 | } | |
647 | } | |
c906108c SS |
648 | |
649 | static void | |
96baa820 | 650 | follow_exec (int pid, char *execd_pathname) |
c906108c | 651 | { |
c906108c | 652 | int saved_pid = pid; |
7a292a7a SS |
653 | struct target_ops *tgt; |
654 | ||
655 | if (!may_follow_exec) | |
656 | return; | |
c906108c SS |
657 | |
658 | /* Did this exec() follow a vfork()? If so, we must follow the | |
659 | vfork now too. Do it before following the exec. */ | |
660 | if (follow_vfork_when_exec && | |
661 | (pending_follow.kind == TARGET_WAITKIND_VFORKED)) | |
662 | { | |
663 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
664 | follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); | |
665 | follow_vfork_when_exec = 0; | |
666 | saved_pid = inferior_pid; | |
667 | ||
668 | /* Did we follow the parent? If so, we're done. If we followed | |
669 | the child then we must also follow its exec(). */ | |
670 | if (inferior_pid == pending_follow.fork_event.parent_pid) | |
671 | return; | |
672 | } | |
673 | ||
674 | /* This is an exec event that we actually wish to pay attention to. | |
675 | Refresh our symbol table to the newly exec'd program, remove any | |
676 | momentary bp's, etc. | |
677 | ||
678 | If there are breakpoints, they aren't really inserted now, | |
679 | since the exec() transformed our inferior into a fresh set | |
680 | of instructions. | |
681 | ||
682 | We want to preserve symbolic breakpoints on the list, since | |
683 | we have hopes that they can be reset after the new a.out's | |
684 | symbol table is read. | |
685 | ||
686 | However, any "raw" breakpoints must be removed from the list | |
687 | (e.g., the solib bp's), since their address is probably invalid | |
688 | now. | |
689 | ||
690 | And, we DON'T want to call delete_breakpoints() here, since | |
691 | that may write the bp's "shadow contents" (the instruction | |
692 | value that was overwritten witha TRAP instruction). Since | |
693 | we now have a new a.out, those shadow contents aren't valid. */ | |
694 | update_breakpoints_after_exec (); | |
695 | ||
696 | /* If there was one, it's gone now. We cannot truly step-to-next | |
697 | statement through an exec(). */ | |
698 | step_resume_breakpoint = NULL; | |
699 | step_range_start = 0; | |
700 | step_range_end = 0; | |
701 | ||
702 | /* If there was one, it's gone now. */ | |
703 | through_sigtramp_breakpoint = NULL; | |
704 | ||
705 | /* What is this a.out's name? */ | |
706 | printf_unfiltered ("Executing new program: %s\n", execd_pathname); | |
707 | ||
708 | /* We've followed the inferior through an exec. Therefore, the | |
709 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
710 | |
711 | /* First collect the run target in effect. */ | |
712 | tgt = find_run_target (); | |
713 | /* If we can't find one, things are in a very strange state... */ | |
714 | if (tgt == NULL) | |
715 | error ("Could find run target to save before following exec"); | |
716 | ||
c906108c SS |
717 | gdb_flush (gdb_stdout); |
718 | target_mourn_inferior (); | |
c5aa993b | 719 | inferior_pid = saved_pid; /* Because mourn_inferior resets inferior_pid. */ |
7a292a7a | 720 | push_target (tgt); |
c906108c SS |
721 | |
722 | /* That a.out is now the one to use. */ | |
723 | exec_file_attach (execd_pathname, 0); | |
724 | ||
725 | /* And also is where symbols can be found. */ | |
726 | symbol_file_command (execd_pathname, 0); | |
727 | ||
728 | /* Reset the shared library package. This ensures that we get | |
729 | a shlib event when the child reaches "_start", at which point | |
730 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 731 | #if defined(SOLIB_RESTART) |
c906108c | 732 | SOLIB_RESTART (); |
7a292a7a SS |
733 | #endif |
734 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
c906108c | 735 | SOLIB_CREATE_INFERIOR_HOOK (inferior_pid); |
7a292a7a | 736 | #endif |
c906108c SS |
737 | |
738 | /* Reinsert all breakpoints. (Those which were symbolic have | |
739 | been reset to the proper address in the new a.out, thanks | |
740 | to symbol_file_command...) */ | |
741 | insert_breakpoints (); | |
742 | ||
743 | /* The next resume of this inferior should bring it to the shlib | |
744 | startup breakpoints. (If the user had also set bp's on | |
745 | "main" from the old (parent) process, then they'll auto- | |
746 | matically get reset there in the new process.) */ | |
c906108c SS |
747 | } |
748 | ||
749 | /* Non-zero if we just simulating a single-step. This is needed | |
750 | because we cannot remove the breakpoints in the inferior process | |
751 | until after the `wait' in `wait_for_inferior'. */ | |
752 | static int singlestep_breakpoints_inserted_p = 0; | |
753 | \f | |
754 | ||
755 | /* Things to clean up if we QUIT out of resume (). */ | |
756 | /* ARGSUSED */ | |
757 | static void | |
96baa820 | 758 | resume_cleanups (int arg) |
c906108c SS |
759 | { |
760 | normal_stop (); | |
761 | } | |
762 | ||
763 | static char schedlock_off[] = "off"; | |
764 | static char schedlock_on[] = "on"; | |
765 | static char schedlock_step[] = "step"; | |
766 | static char *scheduler_mode = schedlock_off; | |
767 | static char *scheduler_enums[] = | |
768 | {schedlock_off, schedlock_on, schedlock_step}; | |
769 | ||
770 | static void | |
96baa820 | 771 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c SS |
772 | { |
773 | if (c->type == set_cmd) | |
774 | if (!target_can_lock_scheduler) | |
775 | { | |
776 | scheduler_mode = schedlock_off; | |
777 | error ("Target '%s' cannot support this command.", | |
778 | target_shortname); | |
779 | } | |
780 | } | |
781 | ||
782 | ||
c2c6d25f JM |
783 | |
784 | ||
c906108c SS |
785 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
786 | wants to interrupt some lengthy single-stepping operation | |
787 | (for child processes, the SIGINT goes to the inferior, and so | |
788 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
789 | other targets, that's not true). | |
790 | ||
791 | STEP nonzero if we should step (zero to continue instead). | |
792 | SIG is the signal to give the inferior (zero for none). */ | |
793 | void | |
96baa820 | 794 | resume (int step, enum target_signal sig) |
c906108c SS |
795 | { |
796 | int should_resume = 1; | |
797 | struct cleanup *old_cleanups = make_cleanup ((make_cleanup_func) | |
798 | resume_cleanups, 0); | |
799 | QUIT; | |
800 | ||
801 | #ifdef CANNOT_STEP_BREAKPOINT | |
802 | /* Most targets can step a breakpoint instruction, thus executing it | |
803 | normally. But if this one cannot, just continue and we will hit | |
804 | it anyway. */ | |
805 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
806 | step = 0; | |
807 | #endif | |
808 | ||
c2c6d25f JM |
809 | /* Normally, by the time we reach `resume', the breakpoints are either |
810 | removed or inserted, as appropriate. The exception is if we're sitting | |
811 | at a permanent breakpoint; we need to step over it, but permanent | |
812 | breakpoints can't be removed. So we have to test for it here. */ | |
813 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
814 | SKIP_PERMANENT_BREAKPOINT (); | |
815 | ||
c906108c SS |
816 | if (SOFTWARE_SINGLE_STEP_P && step) |
817 | { | |
818 | /* Do it the hard way, w/temp breakpoints */ | |
c5aa993b | 819 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
c906108c SS |
820 | /* ...and don't ask hardware to do it. */ |
821 | step = 0; | |
822 | /* and do not pull these breakpoints until after a `wait' in | |
823 | `wait_for_inferior' */ | |
824 | singlestep_breakpoints_inserted_p = 1; | |
825 | } | |
826 | ||
827 | /* Handle any optimized stores to the inferior NOW... */ | |
828 | #ifdef DO_DEFERRED_STORES | |
829 | DO_DEFERRED_STORES; | |
830 | #endif | |
831 | ||
c906108c SS |
832 | /* If there were any forks/vforks/execs that were caught and are |
833 | now to be followed, then do so. */ | |
834 | switch (pending_follow.kind) | |
835 | { | |
836 | case (TARGET_WAITKIND_FORKED): | |
837 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
838 | follow_fork (inferior_pid, pending_follow.fork_event.child_pid); | |
839 | break; | |
840 | ||
841 | case (TARGET_WAITKIND_VFORKED): | |
842 | { | |
843 | int saw_child_exec = pending_follow.fork_event.saw_child_exec; | |
844 | ||
845 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
846 | follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); | |
847 | ||
848 | /* Did we follow the child, but not yet see the child's exec event? | |
c5aa993b JM |
849 | If so, then it actually ought to be waiting for us; we respond to |
850 | parent vfork events. We don't actually want to resume the child | |
851 | in this situation; we want to just get its exec event. */ | |
c906108c SS |
852 | if (!saw_child_exec && |
853 | (inferior_pid == pending_follow.fork_event.child_pid)) | |
854 | should_resume = 0; | |
855 | } | |
856 | break; | |
857 | ||
858 | case (TARGET_WAITKIND_EXECD): | |
859 | /* If we saw a vfork event but couldn't follow it until we saw | |
c5aa993b | 860 | an exec, then now might be the time! */ |
c906108c SS |
861 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
862 | /* follow_exec is called as soon as the exec event is seen. */ | |
863 | break; | |
864 | ||
865 | default: | |
866 | break; | |
867 | } | |
c906108c SS |
868 | |
869 | /* Install inferior's terminal modes. */ | |
870 | target_terminal_inferior (); | |
871 | ||
872 | if (should_resume) | |
873 | { | |
7a292a7a | 874 | if (use_thread_step_needed && thread_step_needed) |
c906108c SS |
875 | { |
876 | /* We stopped on a BPT instruction; | |
877 | don't continue other threads and | |
878 | just step this thread. */ | |
879 | thread_step_needed = 0; | |
880 | ||
881 | if (!breakpoint_here_p (read_pc ())) | |
882 | { | |
883 | /* Breakpoint deleted: ok to do regular resume | |
c5aa993b | 884 | where all the threads either step or continue. */ |
c906108c SS |
885 | target_resume (-1, step, sig); |
886 | } | |
887 | else | |
888 | { | |
889 | if (!step) | |
890 | { | |
891 | warning ("Internal error, changing continue to step."); | |
892 | remove_breakpoints (); | |
893 | breakpoints_inserted = 0; | |
894 | trap_expected = 1; | |
895 | step = 1; | |
896 | } | |
897 | ||
898 | target_resume (inferior_pid, step, sig); | |
899 | } | |
900 | } | |
901 | else | |
c906108c SS |
902 | { |
903 | /* Vanilla resume. */ | |
904 | ||
905 | if ((scheduler_mode == schedlock_on) || | |
906 | (scheduler_mode == schedlock_step && step != 0)) | |
907 | target_resume (inferior_pid, step, sig); | |
908 | else | |
909 | target_resume (-1, step, sig); | |
910 | } | |
911 | } | |
912 | ||
913 | discard_cleanups (old_cleanups); | |
914 | } | |
915 | \f | |
916 | ||
917 | /* Clear out all variables saying what to do when inferior is continued. | |
918 | First do this, then set the ones you want, then call `proceed'. */ | |
919 | ||
920 | void | |
96baa820 | 921 | clear_proceed_status (void) |
c906108c SS |
922 | { |
923 | trap_expected = 0; | |
924 | step_range_start = 0; | |
925 | step_range_end = 0; | |
926 | step_frame_address = 0; | |
927 | step_over_calls = -1; | |
928 | stop_after_trap = 0; | |
929 | stop_soon_quietly = 0; | |
930 | proceed_to_finish = 0; | |
931 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
932 | ||
933 | /* Discard any remaining commands or status from previous stop. */ | |
934 | bpstat_clear (&stop_bpstat); | |
935 | } | |
936 | ||
937 | /* Basic routine for continuing the program in various fashions. | |
938 | ||
939 | ADDR is the address to resume at, or -1 for resume where stopped. | |
940 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 941 | or -1 for act according to how it stopped. |
c906108c | 942 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
943 | -1 means return after that and print nothing. |
944 | You should probably set various step_... variables | |
945 | before calling here, if you are stepping. | |
c906108c SS |
946 | |
947 | You should call clear_proceed_status before calling proceed. */ | |
948 | ||
949 | void | |
96baa820 | 950 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
951 | { |
952 | int oneproc = 0; | |
953 | ||
954 | if (step > 0) | |
955 | step_start_function = find_pc_function (read_pc ()); | |
956 | if (step < 0) | |
957 | stop_after_trap = 1; | |
958 | ||
2acceee2 | 959 | if (addr == (CORE_ADDR) -1) |
c906108c SS |
960 | { |
961 | /* If there is a breakpoint at the address we will resume at, | |
c5aa993b JM |
962 | step one instruction before inserting breakpoints |
963 | so that we do not stop right away (and report a second | |
c906108c SS |
964 | hit at this breakpoint). */ |
965 | ||
966 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) | |
967 | oneproc = 1; | |
968 | ||
969 | #ifndef STEP_SKIPS_DELAY | |
970 | #define STEP_SKIPS_DELAY(pc) (0) | |
971 | #define STEP_SKIPS_DELAY_P (0) | |
972 | #endif | |
973 | /* Check breakpoint_here_p first, because breakpoint_here_p is fast | |
c5aa993b JM |
974 | (it just checks internal GDB data structures) and STEP_SKIPS_DELAY |
975 | is slow (it needs to read memory from the target). */ | |
c906108c SS |
976 | if (STEP_SKIPS_DELAY_P |
977 | && breakpoint_here_p (read_pc () + 4) | |
978 | && STEP_SKIPS_DELAY (read_pc ())) | |
979 | oneproc = 1; | |
980 | } | |
981 | else | |
982 | { | |
983 | write_pc (addr); | |
984 | ||
985 | /* New address; we don't need to single-step a thread | |
c5aa993b JM |
986 | over a breakpoint we just hit, 'cause we aren't |
987 | continuing from there. | |
c906108c | 988 | |
c5aa993b JM |
989 | It's not worth worrying about the case where a user |
990 | asks for a "jump" at the current PC--if they get the | |
991 | hiccup of re-hiting a hit breakpoint, what else do | |
992 | they expect? */ | |
c906108c SS |
993 | thread_step_needed = 0; |
994 | } | |
995 | ||
996 | #ifdef PREPARE_TO_PROCEED | |
997 | /* In a multi-threaded task we may select another thread | |
998 | and then continue or step. | |
999 | ||
1000 | But if the old thread was stopped at a breakpoint, it | |
1001 | will immediately cause another breakpoint stop without | |
1002 | any execution (i.e. it will report a breakpoint hit | |
1003 | incorrectly). So we must step over it first. | |
1004 | ||
1005 | PREPARE_TO_PROCEED checks the current thread against the thread | |
1006 | that reported the most recent event. If a step-over is required | |
1007 | it returns TRUE and sets the current thread to the old thread. */ | |
9e086581 | 1008 | if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ())) |
c906108c SS |
1009 | { |
1010 | oneproc = 1; | |
1011 | thread_step_needed = 1; | |
1012 | } | |
1013 | ||
1014 | #endif /* PREPARE_TO_PROCEED */ | |
1015 | ||
1016 | #ifdef HP_OS_BUG | |
1017 | if (trap_expected_after_continue) | |
1018 | { | |
1019 | /* If (step == 0), a trap will be automatically generated after | |
c5aa993b JM |
1020 | the first instruction is executed. Force step one |
1021 | instruction to clear this condition. This should not occur | |
1022 | if step is nonzero, but it is harmless in that case. */ | |
c906108c SS |
1023 | oneproc = 1; |
1024 | trap_expected_after_continue = 0; | |
1025 | } | |
1026 | #endif /* HP_OS_BUG */ | |
1027 | ||
1028 | if (oneproc) | |
1029 | /* We will get a trace trap after one instruction. | |
1030 | Continue it automatically and insert breakpoints then. */ | |
1031 | trap_expected = 1; | |
1032 | else | |
1033 | { | |
1034 | int temp = insert_breakpoints (); | |
1035 | if (temp) | |
1036 | { | |
1037 | print_sys_errmsg ("ptrace", temp); | |
1038 | error ("Cannot insert breakpoints.\n\ | |
1039 | The same program may be running in another process."); | |
1040 | } | |
1041 | ||
1042 | breakpoints_inserted = 1; | |
1043 | } | |
1044 | ||
1045 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
1046 | stop_signal = siggnal; | |
1047 | /* If this signal should not be seen by program, | |
1048 | give it zero. Used for debugging signals. */ | |
1049 | else if (!signal_program[stop_signal]) | |
1050 | stop_signal = TARGET_SIGNAL_0; | |
1051 | ||
1052 | annotate_starting (); | |
1053 | ||
1054 | /* Make sure that output from GDB appears before output from the | |
1055 | inferior. */ | |
1056 | gdb_flush (gdb_stdout); | |
1057 | ||
1058 | /* Resume inferior. */ | |
1059 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
1060 | ||
1061 | /* Wait for it to stop (if not standalone) | |
1062 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
1063 | /* Do this only if we are not using the event loop, or if the target |
1064 | does not support asynchronous execution. */ | |
6426a772 | 1065 | if (!event_loop_p || !target_can_async_p ()) |
43ff13b4 JM |
1066 | { |
1067 | wait_for_inferior (); | |
1068 | normal_stop (); | |
1069 | } | |
c906108c SS |
1070 | } |
1071 | ||
1072 | /* Record the pc and sp of the program the last time it stopped. | |
1073 | These are just used internally by wait_for_inferior, but need | |
1074 | to be preserved over calls to it and cleared when the inferior | |
1075 | is started. */ | |
1076 | static CORE_ADDR prev_pc; | |
1077 | static CORE_ADDR prev_func_start; | |
1078 | static char *prev_func_name; | |
1079 | \f | |
1080 | ||
1081 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 1082 | |
c906108c | 1083 | void |
96baa820 | 1084 | start_remote (void) |
c906108c SS |
1085 | { |
1086 | init_thread_list (); | |
1087 | init_wait_for_inferior (); | |
1088 | stop_soon_quietly = 1; | |
1089 | trap_expected = 0; | |
43ff13b4 | 1090 | |
6426a772 JM |
1091 | /* Always go on waiting for the target, regardless of the mode. */ |
1092 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
1093 | indicate th wait_for_inferior that a target should timeout if | |
1094 | nothing is returned (instead of just blocking). Because of this, | |
1095 | targets expecting an immediate response need to, internally, set | |
1096 | things up so that the target_wait() is forced to eventually | |
1097 | timeout. */ | |
1098 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
1099 | differentiate to its caller what the state of the target is after | |
1100 | the initial open has been performed. Here we're assuming that | |
1101 | the target has stopped. It should be possible to eventually have | |
1102 | target_open() return to the caller an indication that the target | |
1103 | is currently running and GDB state should be set to the same as | |
1104 | for an async run. */ | |
1105 | wait_for_inferior (); | |
1106 | normal_stop (); | |
c906108c SS |
1107 | } |
1108 | ||
1109 | /* Initialize static vars when a new inferior begins. */ | |
1110 | ||
1111 | void | |
96baa820 | 1112 | init_wait_for_inferior (void) |
c906108c SS |
1113 | { |
1114 | /* These are meaningless until the first time through wait_for_inferior. */ | |
1115 | prev_pc = 0; | |
1116 | prev_func_start = 0; | |
1117 | prev_func_name = NULL; | |
1118 | ||
1119 | #ifdef HP_OS_BUG | |
1120 | trap_expected_after_continue = 0; | |
1121 | #endif | |
1122 | breakpoints_inserted = 0; | |
1123 | breakpoint_init_inferior (inf_starting); | |
1124 | ||
1125 | /* Don't confuse first call to proceed(). */ | |
1126 | stop_signal = TARGET_SIGNAL_0; | |
1127 | ||
1128 | /* The first resume is not following a fork/vfork/exec. */ | |
1129 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
1130 | pending_follow.fork_event.saw_parent_fork = 0; | |
1131 | pending_follow.fork_event.saw_child_fork = 0; | |
1132 | pending_follow.fork_event.saw_child_exec = 0; | |
1133 | ||
1134 | /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ | |
1135 | number_of_threads_in_syscalls = 0; | |
1136 | ||
1137 | clear_proceed_status (); | |
1138 | } | |
1139 | ||
1140 | static void | |
96baa820 | 1141 | delete_breakpoint_current_contents (void *arg) |
c906108c SS |
1142 | { |
1143 | struct breakpoint **breakpointp = (struct breakpoint **) arg; | |
1144 | if (*breakpointp != NULL) | |
1145 | { | |
1146 | delete_breakpoint (*breakpointp); | |
1147 | *breakpointp = NULL; | |
1148 | } | |
1149 | } | |
1150 | \f | |
b83266a0 SS |
1151 | /* This enum encodes possible reasons for doing a target_wait, so that |
1152 | wfi can call target_wait in one place. (Ultimately the call will be | |
1153 | moved out of the infinite loop entirely.) */ | |
1154 | ||
c5aa993b JM |
1155 | enum infwait_states |
1156 | { | |
cd0fc7c3 SS |
1157 | infwait_normal_state, |
1158 | infwait_thread_hop_state, | |
1159 | infwait_nullified_state, | |
1160 | infwait_nonstep_watch_state | |
b83266a0 SS |
1161 | }; |
1162 | ||
11cf8741 JM |
1163 | /* Why did the inferior stop? Used to print the appropriate messages |
1164 | to the interface from within handle_inferior_event(). */ | |
1165 | enum inferior_stop_reason | |
1166 | { | |
1167 | /* We don't know why. */ | |
1168 | STOP_UNKNOWN, | |
1169 | /* Step, next, nexti, stepi finished. */ | |
1170 | END_STEPPING_RANGE, | |
1171 | /* Found breakpoint. */ | |
1172 | BREAKPOINT_HIT, | |
1173 | /* Inferior terminated by signal. */ | |
1174 | SIGNAL_EXITED, | |
1175 | /* Inferior exited. */ | |
1176 | EXITED, | |
1177 | /* Inferior received signal, and user asked to be notified. */ | |
1178 | SIGNAL_RECEIVED | |
1179 | }; | |
1180 | ||
cd0fc7c3 SS |
1181 | /* This structure contains what used to be local variables in |
1182 | wait_for_inferior. Probably many of them can return to being | |
1183 | locals in handle_inferior_event. */ | |
1184 | ||
c5aa993b JM |
1185 | struct execution_control_state |
1186 | { | |
1187 | struct target_waitstatus ws; | |
1188 | struct target_waitstatus *wp; | |
1189 | int another_trap; | |
1190 | int random_signal; | |
1191 | CORE_ADDR stop_func_start; | |
1192 | CORE_ADDR stop_func_end; | |
1193 | char *stop_func_name; | |
1194 | struct symtab_and_line sal; | |
1195 | int remove_breakpoints_on_following_step; | |
1196 | int current_line; | |
1197 | struct symtab *current_symtab; | |
1198 | int handling_longjmp; /* FIXME */ | |
1199 | int pid; | |
1200 | int saved_inferior_pid; | |
1201 | int update_step_sp; | |
1202 | int stepping_through_solib_after_catch; | |
1203 | bpstat stepping_through_solib_catchpoints; | |
1204 | int enable_hw_watchpoints_after_wait; | |
1205 | int stepping_through_sigtramp; | |
1206 | int new_thread_event; | |
1207 | struct target_waitstatus tmpstatus; | |
1208 | enum infwait_states infwait_state; | |
1209 | int waiton_pid; | |
1210 | int wait_some_more; | |
1211 | }; | |
1212 | ||
96baa820 | 1213 | void init_execution_control_state (struct execution_control_state * ecs); |
c5aa993b | 1214 | |
96baa820 | 1215 | void handle_inferior_event (struct execution_control_state * ecs); |
cd0fc7c3 | 1216 | |
104c1213 | 1217 | static void check_sigtramp2 (struct execution_control_state *ecs); |
c2c6d25f | 1218 | static void step_into_function (struct execution_control_state *ecs); |
d4f3574e | 1219 | static void step_over_function (struct execution_control_state *ecs); |
104c1213 JM |
1220 | static void stop_stepping (struct execution_control_state *ecs); |
1221 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 1222 | static void keep_going (struct execution_control_state *ecs); |
11cf8741 | 1223 | static void print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info); |
104c1213 | 1224 | |
cd0fc7c3 SS |
1225 | /* Wait for control to return from inferior to debugger. |
1226 | If inferior gets a signal, we may decide to start it up again | |
1227 | instead of returning. That is why there is a loop in this function. | |
1228 | When this function actually returns it means the inferior | |
1229 | should be left stopped and GDB should read more commands. */ | |
1230 | ||
1231 | void | |
96baa820 | 1232 | wait_for_inferior (void) |
cd0fc7c3 SS |
1233 | { |
1234 | struct cleanup *old_cleanups; | |
1235 | struct execution_control_state ecss; | |
1236 | struct execution_control_state *ecs; | |
c906108c SS |
1237 | |
1238 | old_cleanups = make_cleanup (delete_breakpoint_current_contents, | |
1239 | &step_resume_breakpoint); | |
1240 | make_cleanup (delete_breakpoint_current_contents, | |
1241 | &through_sigtramp_breakpoint); | |
cd0fc7c3 SS |
1242 | |
1243 | /* wfi still stays in a loop, so it's OK just to take the address of | |
1244 | a local to get the ecs pointer. */ | |
1245 | ecs = &ecss; | |
1246 | ||
1247 | /* Fill in with reasonable starting values. */ | |
1248 | init_execution_control_state (ecs); | |
1249 | ||
c906108c SS |
1250 | thread_step_needed = 0; |
1251 | ||
c906108c | 1252 | /* We'll update this if & when we switch to a new thread. */ |
7a292a7a SS |
1253 | if (may_switch_from_inferior_pid) |
1254 | switched_from_inferior_pid = inferior_pid; | |
c906108c | 1255 | |
cd0fc7c3 SS |
1256 | overlay_cache_invalid = 1; |
1257 | ||
1258 | /* We have to invalidate the registers BEFORE calling target_wait | |
1259 | because they can be loaded from the target while in target_wait. | |
1260 | This makes remote debugging a bit more efficient for those | |
1261 | targets that provide critical registers as part of their normal | |
1262 | status mechanism. */ | |
1263 | ||
1264 | registers_changed (); | |
b83266a0 | 1265 | |
c906108c SS |
1266 | while (1) |
1267 | { | |
cd0fc7c3 SS |
1268 | if (target_wait_hook) |
1269 | ecs->pid = target_wait_hook (ecs->waiton_pid, ecs->wp); | |
1270 | else | |
1271 | ecs->pid = target_wait (ecs->waiton_pid, ecs->wp); | |
c906108c | 1272 | |
cd0fc7c3 SS |
1273 | /* Now figure out what to do with the result of the result. */ |
1274 | handle_inferior_event (ecs); | |
c906108c | 1275 | |
cd0fc7c3 SS |
1276 | if (!ecs->wait_some_more) |
1277 | break; | |
1278 | } | |
1279 | do_cleanups (old_cleanups); | |
1280 | } | |
c906108c | 1281 | |
43ff13b4 JM |
1282 | /* Asynchronous version of wait_for_inferior. It is called by the |
1283 | event loop whenever a change of state is detected on the file | |
1284 | descriptor corresponding to the target. It can be called more than | |
1285 | once to complete a single execution command. In such cases we need | |
1286 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1287 | last time that this function is called for a single execution | |
1288 | command, then report to the user that the inferior has stopped, and | |
1289 | do the necessary cleanups. */ | |
1290 | ||
1291 | struct execution_control_state async_ecss; | |
1292 | struct execution_control_state *async_ecs; | |
1293 | ||
1294 | void | |
c2c6d25f | 1295 | fetch_inferior_event (client_data) |
2acceee2 | 1296 | void *client_data; |
43ff13b4 JM |
1297 | { |
1298 | static struct cleanup *old_cleanups; | |
1299 | ||
c5aa993b | 1300 | async_ecs = &async_ecss; |
43ff13b4 JM |
1301 | |
1302 | if (!async_ecs->wait_some_more) | |
1303 | { | |
1304 | old_cleanups = make_exec_cleanup (delete_breakpoint_current_contents, | |
c5aa993b | 1305 | &step_resume_breakpoint); |
43ff13b4 | 1306 | make_exec_cleanup (delete_breakpoint_current_contents, |
c5aa993b | 1307 | &through_sigtramp_breakpoint); |
43ff13b4 JM |
1308 | |
1309 | /* Fill in with reasonable starting values. */ | |
1310 | init_execution_control_state (async_ecs); | |
1311 | ||
1312 | thread_step_needed = 0; | |
1313 | ||
1314 | /* We'll update this if & when we switch to a new thread. */ | |
1315 | if (may_switch_from_inferior_pid) | |
1316 | switched_from_inferior_pid = inferior_pid; | |
1317 | ||
1318 | overlay_cache_invalid = 1; | |
1319 | ||
1320 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1321 | because they can be loaded from the target while in target_wait. |
1322 | This makes remote debugging a bit more efficient for those | |
1323 | targets that provide critical registers as part of their normal | |
1324 | status mechanism. */ | |
43ff13b4 JM |
1325 | |
1326 | registers_changed (); | |
1327 | } | |
1328 | ||
1329 | if (target_wait_hook) | |
1330 | async_ecs->pid = target_wait_hook (async_ecs->waiton_pid, async_ecs->wp); | |
1331 | else | |
1332 | async_ecs->pid = target_wait (async_ecs->waiton_pid, async_ecs->wp); | |
1333 | ||
1334 | /* Now figure out what to do with the result of the result. */ | |
1335 | handle_inferior_event (async_ecs); | |
1336 | ||
1337 | if (!async_ecs->wait_some_more) | |
1338 | { | |
adf40b2e JM |
1339 | /* Do only the cleanups that have been added by this |
1340 | function. Let the continuations for the commands do the rest, | |
1341 | if there are any. */ | |
43ff13b4 JM |
1342 | do_exec_cleanups (old_cleanups); |
1343 | normal_stop (); | |
c2d11a7d JM |
1344 | if (step_multi && stop_step) |
1345 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1346 | else | |
1347 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1348 | } |
1349 | } | |
1350 | ||
cd0fc7c3 SS |
1351 | /* Prepare an execution control state for looping through a |
1352 | wait_for_inferior-type loop. */ | |
1353 | ||
1354 | void | |
96baa820 | 1355 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1356 | { |
c2d11a7d | 1357 | /* ecs->another_trap? */ |
cd0fc7c3 SS |
1358 | ecs->random_signal = 0; |
1359 | ecs->remove_breakpoints_on_following_step = 0; | |
1360 | ecs->handling_longjmp = 0; /* FIXME */ | |
1361 | ecs->update_step_sp = 0; | |
1362 | ecs->stepping_through_solib_after_catch = 0; | |
1363 | ecs->stepping_through_solib_catchpoints = NULL; | |
1364 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1365 | ecs->stepping_through_sigtramp = 0; | |
1366 | ecs->sal = find_pc_line (prev_pc, 0); | |
1367 | ecs->current_line = ecs->sal.line; | |
1368 | ecs->current_symtab = ecs->sal.symtab; | |
1369 | ecs->infwait_state = infwait_normal_state; | |
1370 | ecs->waiton_pid = -1; | |
1371 | ecs->wp = &(ecs->ws); | |
1372 | } | |
1373 | ||
a0b3c4fd | 1374 | /* Call this function before setting step_resume_breakpoint, as a |
53a5351d JM |
1375 | sanity check. There should never be more than one step-resume |
1376 | breakpoint per thread, so we should never be setting a new | |
1377 | step_resume_breakpoint when one is already active. */ | |
a0b3c4fd | 1378 | static void |
96baa820 | 1379 | check_for_old_step_resume_breakpoint (void) |
a0b3c4fd JM |
1380 | { |
1381 | if (step_resume_breakpoint) | |
1382 | warning ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint"); | |
1383 | } | |
1384 | ||
cd0fc7c3 SS |
1385 | /* Given an execution control state that has been freshly filled in |
1386 | by an event from the inferior, figure out what it means and take | |
1387 | appropriate action. */ | |
c906108c | 1388 | |
cd0fc7c3 | 1389 | void |
96baa820 | 1390 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 SS |
1391 | { |
1392 | CORE_ADDR tmp; | |
1393 | int stepped_after_stopped_by_watchpoint; | |
1394 | ||
1395 | /* Keep this extra brace for now, minimizes diffs. */ | |
1396 | { | |
c5aa993b JM |
1397 | switch (ecs->infwait_state) |
1398 | { | |
1399 | case infwait_normal_state: | |
1400 | /* Since we've done a wait, we have a new event. Don't | |
1401 | carry over any expectations about needing to step over a | |
1402 | breakpoint. */ | |
1403 | thread_step_needed = 0; | |
1404 | ||
1405 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event | |
1406 | is serviced in this loop, below. */ | |
1407 | if (ecs->enable_hw_watchpoints_after_wait) | |
1408 | { | |
1409 | TARGET_ENABLE_HW_WATCHPOINTS (inferior_pid); | |
1410 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1411 | } | |
1412 | stepped_after_stopped_by_watchpoint = 0; | |
1413 | break; | |
b83266a0 | 1414 | |
c5aa993b JM |
1415 | case infwait_thread_hop_state: |
1416 | insert_breakpoints (); | |
c906108c | 1417 | |
c5aa993b JM |
1418 | /* We need to restart all the threads now, |
1419 | * unles we're running in scheduler-locked mode. | |
1420 | * FIXME: shouldn't we look at currently_stepping ()? | |
1421 | */ | |
1422 | if (scheduler_mode == schedlock_on) | |
1423 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
1424 | else | |
1425 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
1426 | ecs->infwait_state = infwait_normal_state; | |
104c1213 JM |
1427 | prepare_to_wait (ecs); |
1428 | return; | |
c906108c | 1429 | |
c5aa993b JM |
1430 | case infwait_nullified_state: |
1431 | break; | |
b83266a0 | 1432 | |
c5aa993b JM |
1433 | case infwait_nonstep_watch_state: |
1434 | insert_breakpoints (); | |
b83266a0 | 1435 | |
c5aa993b JM |
1436 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1437 | handle things like signals arriving and other things happening | |
1438 | in combination correctly? */ | |
1439 | stepped_after_stopped_by_watchpoint = 1; | |
1440 | break; | |
1441 | } | |
1442 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1443 | |
c5aa993b | 1444 | flush_cached_frames (); |
c906108c | 1445 | |
c5aa993b | 1446 | /* If it's a new process, add it to the thread database */ |
c906108c | 1447 | |
c5aa993b | 1448 | ecs->new_thread_event = ((ecs->pid != inferior_pid) && !in_thread_list (ecs->pid)); |
c906108c | 1449 | |
c5aa993b JM |
1450 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
1451 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
1452 | && ecs->new_thread_event) | |
1453 | { | |
1454 | add_thread (ecs->pid); | |
c906108c | 1455 | |
c5aa993b | 1456 | printf_filtered ("[New %s]\n", target_pid_or_tid_to_str (ecs->pid)); |
c906108c SS |
1457 | |
1458 | #if 0 | |
c5aa993b JM |
1459 | /* NOTE: This block is ONLY meant to be invoked in case of a |
1460 | "thread creation event"! If it is invoked for any other | |
1461 | sort of event (such as a new thread landing on a breakpoint), | |
1462 | the event will be discarded, which is almost certainly | |
1463 | a bad thing! | |
1464 | ||
1465 | To avoid this, the low-level module (eg. target_wait) | |
1466 | should call in_thread_list and add_thread, so that the | |
1467 | new thread is known by the time we get here. */ | |
1468 | ||
1469 | /* We may want to consider not doing a resume here in order | |
1470 | to give the user a chance to play with the new thread. | |
1471 | It might be good to make that a user-settable option. */ | |
1472 | ||
1473 | /* At this point, all threads are stopped (happens | |
1474 | automatically in either the OS or the native code). | |
1475 | Therefore we need to continue all threads in order to | |
1476 | make progress. */ | |
1477 | ||
1478 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1479 | prepare_to_wait (ecs); |
1480 | return; | |
c906108c | 1481 | #endif |
c5aa993b | 1482 | } |
c906108c | 1483 | |
c5aa993b JM |
1484 | switch (ecs->ws.kind) |
1485 | { | |
1486 | case TARGET_WAITKIND_LOADED: | |
1487 | /* Ignore gracefully during startup of the inferior, as it | |
1488 | might be the shell which has just loaded some objects, | |
1489 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1490 | #ifdef SOLIB_ADD |
c5aa993b JM |
1491 | if (!stop_soon_quietly) |
1492 | { | |
1493 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1494 | breakpoint addresses via breakpoint_re_set. */ | |
1495 | if (breakpoints_inserted) | |
1496 | remove_breakpoints (); | |
c906108c | 1497 | |
c5aa993b JM |
1498 | /* Check for any newly added shared libraries if we're |
1499 | supposed to be adding them automatically. */ | |
1500 | if (auto_solib_add) | |
1501 | { | |
1502 | /* Switch terminal for any messages produced by | |
1503 | breakpoint_re_set. */ | |
1504 | target_terminal_ours_for_output (); | |
1505 | SOLIB_ADD (NULL, 0, NULL); | |
1506 | target_terminal_inferior (); | |
1507 | } | |
c906108c | 1508 | |
c5aa993b JM |
1509 | /* Reinsert breakpoints and continue. */ |
1510 | if (breakpoints_inserted) | |
1511 | insert_breakpoints (); | |
1512 | } | |
c906108c | 1513 | #endif |
c5aa993b | 1514 | resume (0, TARGET_SIGNAL_0); |
104c1213 JM |
1515 | prepare_to_wait (ecs); |
1516 | return; | |
c5aa993b JM |
1517 | |
1518 | case TARGET_WAITKIND_SPURIOUS: | |
1519 | resume (0, TARGET_SIGNAL_0); | |
104c1213 JM |
1520 | prepare_to_wait (ecs); |
1521 | return; | |
c5aa993b JM |
1522 | |
1523 | case TARGET_WAITKIND_EXITED: | |
1524 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
11cf8741 | 1525 | print_stop_reason (EXITED, ecs->ws.value.integer); |
c5aa993b JM |
1526 | |
1527 | /* Record the exit code in the convenience variable $_exitcode, so | |
1528 | that the user can inspect this again later. */ | |
1529 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1530 | value_from_longest (builtin_type_int, | |
1531 | (LONGEST) ecs->ws.value.integer)); | |
1532 | gdb_flush (gdb_stdout); | |
1533 | target_mourn_inferior (); | |
1534 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P */ | |
1535 | stop_print_frame = 0; | |
104c1213 JM |
1536 | stop_stepping (ecs); |
1537 | return; | |
c5aa993b JM |
1538 | |
1539 | case TARGET_WAITKIND_SIGNALLED: | |
1540 | stop_print_frame = 0; | |
1541 | stop_signal = ecs->ws.value.sig; | |
1542 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b JM |
1543 | |
1544 | /* This looks pretty bogus to me. Doesn't TARGET_WAITKIND_SIGNALLED | |
1545 | mean it is already dead? This has been here since GDB 2.8, so | |
1546 | perhaps it means rms didn't understand unix waitstatuses? | |
1547 | For the moment I'm just kludging around this in remote.c | |
1548 | rather than trying to change it here --kingdon, 5 Dec 1994. */ | |
1549 | target_kill (); /* kill mourns as well */ | |
1550 | ||
11cf8741 | 1551 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
c5aa993b | 1552 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P */ |
104c1213 JM |
1553 | stop_stepping (ecs); |
1554 | return; | |
c5aa993b JM |
1555 | |
1556 | /* The following are the only cases in which we keep going; | |
1557 | the above cases end in a continue or goto. */ | |
1558 | case TARGET_WAITKIND_FORKED: | |
1559 | stop_signal = TARGET_SIGNAL_TRAP; | |
1560 | pending_follow.kind = ecs->ws.kind; | |
1561 | ||
1562 | /* Ignore fork events reported for the parent; we're only | |
1563 | interested in reacting to forks of the child. Note that | |
1564 | we expect the child's fork event to be available if we | |
1565 | waited for it now. */ | |
1566 | if (inferior_pid == ecs->pid) | |
1567 | { | |
1568 | pending_follow.fork_event.saw_parent_fork = 1; | |
1569 | pending_follow.fork_event.parent_pid = ecs->pid; | |
1570 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
104c1213 JM |
1571 | prepare_to_wait (ecs); |
1572 | return; | |
c5aa993b JM |
1573 | } |
1574 | else | |
1575 | { | |
1576 | pending_follow.fork_event.saw_child_fork = 1; | |
1577 | pending_follow.fork_event.child_pid = ecs->pid; | |
1578 | pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid; | |
1579 | } | |
c906108c | 1580 | |
c5aa993b JM |
1581 | stop_pc = read_pc_pid (ecs->pid); |
1582 | ecs->saved_inferior_pid = inferior_pid; | |
1583 | inferior_pid = ecs->pid; | |
6426a772 | 1584 | stop_bpstat = bpstat_stop_status (&stop_pc, currently_stepping (ecs)); |
c5aa993b JM |
1585 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1586 | inferior_pid = ecs->saved_inferior_pid; | |
1587 | goto process_event_stop_test; | |
1588 | ||
1589 | /* If this a platform which doesn't allow a debugger to touch a | |
1590 | vfork'd inferior until after it exec's, then we'd best keep | |
1591 | our fingers entirely off the inferior, other than continuing | |
1592 | it. This has the unfortunate side-effect that catchpoints | |
1593 | of vforks will be ignored. But since the platform doesn't | |
1594 | allow the inferior be touched at vfork time, there's really | |
1595 | little choice. */ | |
1596 | case TARGET_WAITKIND_VFORKED: | |
1597 | stop_signal = TARGET_SIGNAL_TRAP; | |
1598 | pending_follow.kind = ecs->ws.kind; | |
1599 | ||
1600 | /* Is this a vfork of the parent? If so, then give any | |
1601 | vfork catchpoints a chance to trigger now. (It's | |
1602 | dangerous to do so if the child canot be touched until | |
1603 | it execs, and the child has not yet exec'd. We probably | |
1604 | should warn the user to that effect when the catchpoint | |
1605 | triggers...) */ | |
1606 | if (ecs->pid == inferior_pid) | |
1607 | { | |
1608 | pending_follow.fork_event.saw_parent_fork = 1; | |
1609 | pending_follow.fork_event.parent_pid = ecs->pid; | |
1610 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
1611 | } | |
c906108c | 1612 | |
c5aa993b JM |
1613 | /* If we've seen the child's vfork event but cannot really touch |
1614 | the child until it execs, then we must continue the child now. | |
1615 | Else, give any vfork catchpoints a chance to trigger now. */ | |
1616 | else | |
1617 | { | |
1618 | pending_follow.fork_event.saw_child_fork = 1; | |
1619 | pending_follow.fork_event.child_pid = ecs->pid; | |
1620 | pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid; | |
1621 | target_post_startup_inferior (pending_follow.fork_event.child_pid); | |
1622 | follow_vfork_when_exec = !target_can_follow_vfork_prior_to_exec (); | |
1623 | if (follow_vfork_when_exec) | |
1624 | { | |
1625 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1626 | prepare_to_wait (ecs); |
1627 | return; | |
c5aa993b JM |
1628 | } |
1629 | } | |
c906108c | 1630 | |
c5aa993b | 1631 | stop_pc = read_pc (); |
6426a772 | 1632 | stop_bpstat = bpstat_stop_status (&stop_pc, currently_stepping (ecs)); |
c5aa993b JM |
1633 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1634 | goto process_event_stop_test; | |
1635 | ||
1636 | case TARGET_WAITKIND_EXECD: | |
1637 | stop_signal = TARGET_SIGNAL_TRAP; | |
1638 | ||
1639 | /* Is this a target which reports multiple exec events per actual | |
1640 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1641 | ignore all but the last one. Just resume the exec'r, and wait | |
1642 | for the next exec event. */ | |
1643 | if (inferior_ignoring_leading_exec_events) | |
1644 | { | |
1645 | inferior_ignoring_leading_exec_events--; | |
1646 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1647 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.parent_pid); | |
1648 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1649 | prepare_to_wait (ecs); |
1650 | return; | |
c5aa993b JM |
1651 | } |
1652 | inferior_ignoring_leading_exec_events = | |
1653 | target_reported_exec_events_per_exec_call () - 1; | |
c906108c | 1654 | |
96baa820 JM |
1655 | pending_follow.execd_pathname = |
1656 | savestring (ecs->ws.value.execd_pathname, | |
1657 | strlen (ecs->ws.value.execd_pathname)); | |
c906108c | 1658 | |
c5aa993b JM |
1659 | /* Did inferior_pid exec, or did a (possibly not-yet-followed) |
1660 | child of a vfork exec? | |
c906108c | 1661 | |
c5aa993b JM |
1662 | ??rehrauer: This is unabashedly an HP-UX specific thing. On |
1663 | HP-UX, events associated with a vforking inferior come in | |
1664 | threes: a vfork event for the child (always first), followed | |
1665 | a vfork event for the parent and an exec event for the child. | |
1666 | The latter two can come in either order. | |
c906108c | 1667 | |
c5aa993b JM |
1668 | If we get the parent vfork event first, life's good: We follow |
1669 | either the parent or child, and then the child's exec event is | |
1670 | a "don't care". | |
c906108c | 1671 | |
c5aa993b JM |
1672 | But if we get the child's exec event first, then we delay |
1673 | responding to it until we handle the parent's vfork. Because, | |
1674 | otherwise we can't satisfy a "catch vfork". */ | |
1675 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1676 | { | |
1677 | pending_follow.fork_event.saw_child_exec = 1; | |
1678 | ||
1679 | /* On some targets, the child must be resumed before | |
1680 | the parent vfork event is delivered. A single-step | |
1681 | suffices. */ | |
1682 | if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ()) | |
1683 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
1684 | /* We expect the parent vfork event to be available now. */ | |
104c1213 JM |
1685 | prepare_to_wait (ecs); |
1686 | return; | |
c5aa993b | 1687 | } |
c906108c | 1688 | |
c5aa993b JM |
1689 | /* This causes the eventpoints and symbol table to be reset. Must |
1690 | do this now, before trying to determine whether to stop. */ | |
1691 | follow_exec (inferior_pid, pending_follow.execd_pathname); | |
1692 | free (pending_follow.execd_pathname); | |
1693 | ||
1694 | stop_pc = read_pc_pid (ecs->pid); | |
1695 | ecs->saved_inferior_pid = inferior_pid; | |
1696 | inferior_pid = ecs->pid; | |
6426a772 | 1697 | stop_bpstat = bpstat_stop_status (&stop_pc, currently_stepping (ecs)); |
c5aa993b JM |
1698 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1699 | inferior_pid = ecs->saved_inferior_pid; | |
1700 | goto process_event_stop_test; | |
1701 | ||
1702 | /* These syscall events are returned on HP-UX, as part of its | |
1703 | implementation of page-protection-based "hardware" watchpoints. | |
1704 | HP-UX has unfortunate interactions between page-protections and | |
1705 | some system calls. Our solution is to disable hardware watches | |
1706 | when a system call is entered, and reenable them when the syscall | |
1707 | completes. The downside of this is that we may miss the precise | |
1708 | point at which a watched piece of memory is modified. "Oh well." | |
1709 | ||
1710 | Note that we may have multiple threads running, which may each | |
1711 | enter syscalls at roughly the same time. Since we don't have a | |
1712 | good notion currently of whether a watched piece of memory is | |
1713 | thread-private, we'd best not have any page-protections active | |
1714 | when any thread is in a syscall. Thus, we only want to reenable | |
1715 | hardware watches when no threads are in a syscall. | |
1716 | ||
1717 | Also, be careful not to try to gather much state about a thread | |
1718 | that's in a syscall. It's frequently a losing proposition. */ | |
1719 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
1720 | number_of_threads_in_syscalls++; | |
1721 | if (number_of_threads_in_syscalls == 1) | |
1722 | { | |
1723 | TARGET_DISABLE_HW_WATCHPOINTS (inferior_pid); | |
1724 | } | |
1725 | resume (0, TARGET_SIGNAL_0); | |
104c1213 JM |
1726 | prepare_to_wait (ecs); |
1727 | return; | |
c906108c | 1728 | |
c5aa993b | 1729 | /* Before examining the threads further, step this thread to |
c906108c SS |
1730 | get it entirely out of the syscall. (We get notice of the |
1731 | event when the thread is just on the verge of exiting a | |
1732 | syscall. Stepping one instruction seems to get it back | |
1733 | into user code.) | |
1734 | ||
1735 | Note that although the logical place to reenable h/w watches | |
1736 | is here, we cannot. We cannot reenable them before stepping | |
1737 | the thread (this causes the next wait on the thread to hang). | |
1738 | ||
1739 | Nor can we enable them after stepping until we've done a wait. | |
cd0fc7c3 | 1740 | Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait |
c906108c SS |
1741 | here, which will be serviced immediately after the target |
1742 | is waited on. */ | |
c5aa993b JM |
1743 | case TARGET_WAITKIND_SYSCALL_RETURN: |
1744 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
c906108c | 1745 | |
c5aa993b JM |
1746 | if (number_of_threads_in_syscalls > 0) |
1747 | { | |
1748 | number_of_threads_in_syscalls--; | |
1749 | ecs->enable_hw_watchpoints_after_wait = | |
1750 | (number_of_threads_in_syscalls == 0); | |
1751 | } | |
104c1213 JM |
1752 | prepare_to_wait (ecs); |
1753 | return; | |
c906108c | 1754 | |
c5aa993b JM |
1755 | case TARGET_WAITKIND_STOPPED: |
1756 | stop_signal = ecs->ws.value.sig; | |
1757 | break; | |
1758 | } | |
c906108c | 1759 | |
c5aa993b JM |
1760 | /* We may want to consider not doing a resume here in order to give |
1761 | the user a chance to play with the new thread. It might be good | |
1762 | to make that a user-settable option. */ | |
c906108c | 1763 | |
c5aa993b JM |
1764 | /* At this point, all threads are stopped (happens automatically in |
1765 | either the OS or the native code). Therefore we need to continue | |
1766 | all threads in order to make progress. */ | |
1767 | if (ecs->new_thread_event) | |
1768 | { | |
1769 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1770 | prepare_to_wait (ecs); |
1771 | return; | |
c5aa993b | 1772 | } |
c906108c | 1773 | |
c5aa993b | 1774 | stop_pc = read_pc_pid (ecs->pid); |
c906108c | 1775 | |
c5aa993b JM |
1776 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1777 | another thread. If so, then step that thread past the breakpoint, | |
1778 | and continue it. */ | |
c906108c | 1779 | |
c5aa993b JM |
1780 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1781 | { | |
1782 | if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p) | |
1783 | ecs->random_signal = 0; | |
1784 | else if (breakpoints_inserted | |
1785 | && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK)) | |
1786 | { | |
cd0fc7c3 | 1787 | ecs->random_signal = 0; |
c5aa993b JM |
1788 | if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, |
1789 | ecs->pid)) | |
1790 | { | |
1791 | int remove_status; | |
1792 | ||
1793 | /* Saw a breakpoint, but it was hit by the wrong thread. | |
1794 | Just continue. */ | |
1795 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, ecs->pid); | |
1796 | ||
1797 | remove_status = remove_breakpoints (); | |
1798 | /* Did we fail to remove breakpoints? If so, try | |
1799 | to set the PC past the bp. (There's at least | |
1800 | one situation in which we can fail to remove | |
1801 | the bp's: On HP-UX's that use ttrace, we can't | |
1802 | change the address space of a vforking child | |
1803 | process until the child exits (well, okay, not | |
1804 | then either :-) or execs. */ | |
1805 | if (remove_status != 0) | |
1806 | { | |
1807 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, ecs->pid); | |
1808 | } | |
1809 | else | |
1810 | { /* Single step */ | |
1811 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
1812 | /* FIXME: What if a signal arrives instead of the | |
1813 | single-step happening? */ | |
1814 | ||
1815 | ecs->waiton_pid = ecs->pid; | |
1816 | ecs->wp = &(ecs->ws); | |
1817 | ecs->infwait_state = infwait_thread_hop_state; | |
104c1213 JM |
1818 | prepare_to_wait (ecs); |
1819 | return; | |
c5aa993b | 1820 | } |
c906108c | 1821 | |
c5aa993b JM |
1822 | /* We need to restart all the threads now, |
1823 | * unles we're running in scheduler-locked mode. | |
1824 | * FIXME: shouldn't we look at currently_stepping ()? | |
1825 | */ | |
1826 | if (scheduler_mode == schedlock_on) | |
1827 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
1828 | else | |
1829 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1830 | prepare_to_wait (ecs); |
1831 | return; | |
c5aa993b JM |
1832 | } |
1833 | else | |
1834 | { | |
1835 | /* This breakpoint matches--either it is the right | |
1836 | thread or it's a generic breakpoint for all threads. | |
1837 | Remember that we'll need to step just _this_ thread | |
1838 | on any following user continuation! */ | |
1839 | thread_step_needed = 1; | |
1840 | } | |
1841 | } | |
1842 | } | |
1843 | else | |
1844 | ecs->random_signal = 1; | |
1845 | ||
1846 | /* See if something interesting happened to the non-current thread. If | |
1847 | so, then switch to that thread, and eventually give control back to | |
1848 | the user. | |
1849 | ||
1850 | Note that if there's any kind of pending follow (i.e., of a fork, | |
1851 | vfork or exec), we don't want to do this now. Rather, we'll let | |
1852 | the next resume handle it. */ | |
1853 | if ((ecs->pid != inferior_pid) && | |
1854 | (pending_follow.kind == TARGET_WAITKIND_SPURIOUS)) | |
1855 | { | |
1856 | int printed = 0; | |
c906108c | 1857 | |
c5aa993b JM |
1858 | /* If it's a random signal for a non-current thread, notify user |
1859 | if he's expressed an interest. */ | |
1860 | if (ecs->random_signal | |
1861 | && signal_print[stop_signal]) | |
1862 | { | |
c906108c SS |
1863 | /* ??rehrauer: I don't understand the rationale for this code. If the |
1864 | inferior will stop as a result of this signal, then the act of handling | |
1865 | the stop ought to print a message that's couches the stoppage in user | |
1866 | terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior | |
1867 | won't stop as a result of the signal -- i.e., if the signal is merely | |
1868 | a side-effect of something GDB's doing "under the covers" for the | |
1869 | user, such as stepping threads over a breakpoint they shouldn't stop | |
1870 | for -- then the message seems to be a serious annoyance at best. | |
1871 | ||
1872 | For now, remove the message altogether. */ | |
1873 | #if 0 | |
c5aa993b JM |
1874 | printed = 1; |
1875 | target_terminal_ours_for_output (); | |
1876 | printf_filtered ("\nProgram received signal %s, %s.\n", | |
1877 | target_signal_to_name (stop_signal), | |
1878 | target_signal_to_string (stop_signal)); | |
1879 | gdb_flush (gdb_stdout); | |
c906108c | 1880 | #endif |
c5aa993b | 1881 | } |
c906108c | 1882 | |
c5aa993b JM |
1883 | /* If it's not SIGTRAP and not a signal we want to stop for, then |
1884 | continue the thread. */ | |
c906108c | 1885 | |
c5aa993b JM |
1886 | if (stop_signal != TARGET_SIGNAL_TRAP |
1887 | && !signal_stop[stop_signal]) | |
1888 | { | |
1889 | if (printed) | |
1890 | target_terminal_inferior (); | |
c906108c | 1891 | |
c5aa993b JM |
1892 | /* Clear the signal if it should not be passed. */ |
1893 | if (signal_program[stop_signal] == 0) | |
1894 | stop_signal = TARGET_SIGNAL_0; | |
c906108c | 1895 | |
c5aa993b | 1896 | target_resume (ecs->pid, 0, stop_signal); |
104c1213 JM |
1897 | prepare_to_wait (ecs); |
1898 | return; | |
c5aa993b | 1899 | } |
c906108c | 1900 | |
c5aa993b JM |
1901 | /* It's a SIGTRAP or a signal we're interested in. Switch threads, |
1902 | and fall into the rest of wait_for_inferior(). */ | |
1903 | ||
c2d11a7d JM |
1904 | /* Caution: it may happen that the new thread (or the old one!) |
1905 | is not in the thread list. In this case we must not attempt | |
1906 | to "switch context", or we run the risk that our context may | |
1907 | be lost. This may happen as a result of the target module | |
1908 | mishandling thread creation. */ | |
1909 | ||
1910 | if (in_thread_list (inferior_pid) && in_thread_list (ecs->pid)) | |
1911 | { /* Perform infrun state context switch: */ | |
1912 | /* Save infrun state for the old thread. */ | |
1913 | save_infrun_state (inferior_pid, prev_pc, | |
1914 | prev_func_start, prev_func_name, | |
1915 | trap_expected, step_resume_breakpoint, | |
1916 | through_sigtramp_breakpoint, | |
1917 | step_range_start, step_range_end, | |
1918 | step_frame_address, ecs->handling_longjmp, | |
1919 | ecs->another_trap, | |
1920 | ecs->stepping_through_solib_after_catch, | |
1921 | ecs->stepping_through_solib_catchpoints, | |
1922 | ecs->stepping_through_sigtramp); | |
1923 | ||
1924 | /* Load infrun state for the new thread. */ | |
1925 | load_infrun_state (ecs->pid, &prev_pc, | |
1926 | &prev_func_start, &prev_func_name, | |
1927 | &trap_expected, &step_resume_breakpoint, | |
1928 | &through_sigtramp_breakpoint, | |
1929 | &step_range_start, &step_range_end, | |
1930 | &step_frame_address, &ecs->handling_longjmp, | |
1931 | &ecs->another_trap, | |
1932 | &ecs->stepping_through_solib_after_catch, | |
1933 | &ecs->stepping_through_solib_catchpoints, | |
1934 | &ecs->stepping_through_sigtramp); | |
1935 | } | |
c5aa993b JM |
1936 | if (may_switch_from_inferior_pid) |
1937 | switched_from_inferior_pid = inferior_pid; | |
1938 | ||
1939 | inferior_pid = ecs->pid; | |
1940 | ||
c5aa993b JM |
1941 | if (context_hook) |
1942 | context_hook (pid_to_thread_id (ecs->pid)); | |
1943 | ||
1944 | printf_filtered ("[Switching to %s]\n", target_pid_to_str (ecs->pid)); | |
1945 | flush_cached_frames (); | |
1946 | } | |
c906108c | 1947 | |
c5aa993b JM |
1948 | if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p) |
1949 | { | |
1950 | /* Pull the single step breakpoints out of the target. */ | |
1951 | SOFTWARE_SINGLE_STEP (0, 0); | |
1952 | singlestep_breakpoints_inserted_p = 0; | |
1953 | } | |
c906108c | 1954 | |
c5aa993b JM |
1955 | /* If PC is pointing at a nullified instruction, then step beyond |
1956 | it so that the user won't be confused when GDB appears to be ready | |
1957 | to execute it. */ | |
c906108c | 1958 | |
c5aa993b JM |
1959 | /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */ |
1960 | if (INSTRUCTION_NULLIFIED) | |
1961 | { | |
1962 | registers_changed (); | |
1963 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
c906108c | 1964 | |
c5aa993b JM |
1965 | /* We may have received a signal that we want to pass to |
1966 | the inferior; therefore, we must not clobber the waitstatus | |
1967 | in WS. */ | |
c906108c | 1968 | |
c5aa993b JM |
1969 | ecs->infwait_state = infwait_nullified_state; |
1970 | ecs->waiton_pid = ecs->pid; | |
1971 | ecs->wp = &(ecs->tmpstatus); | |
104c1213 JM |
1972 | prepare_to_wait (ecs); |
1973 | return; | |
c5aa993b | 1974 | } |
c906108c | 1975 | |
c5aa993b JM |
1976 | /* It may not be necessary to disable the watchpoint to stop over |
1977 | it. For example, the PA can (with some kernel cooperation) | |
1978 | single step over a watchpoint without disabling the watchpoint. */ | |
1979 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1980 | { | |
1981 | resume (1, 0); | |
104c1213 JM |
1982 | prepare_to_wait (ecs); |
1983 | return; | |
c5aa993b | 1984 | } |
c906108c | 1985 | |
c5aa993b JM |
1986 | /* It is far more common to need to disable a watchpoint to step |
1987 | the inferior over it. FIXME. What else might a debug | |
1988 | register or page protection watchpoint scheme need here? */ | |
1989 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
1990 | { | |
1991 | /* At this point, we are stopped at an instruction which has | |
1992 | attempted to write to a piece of memory under control of | |
1993 | a watchpoint. The instruction hasn't actually executed | |
1994 | yet. If we were to evaluate the watchpoint expression | |
1995 | now, we would get the old value, and therefore no change | |
1996 | would seem to have occurred. | |
1997 | ||
1998 | In order to make watchpoints work `right', we really need | |
1999 | to complete the memory write, and then evaluate the | |
2000 | watchpoint expression. The following code does that by | |
2001 | removing the watchpoint (actually, all watchpoints and | |
2002 | breakpoints), single-stepping the target, re-inserting | |
2003 | watchpoints, and then falling through to let normal | |
2004 | single-step processing handle proceed. Since this | |
2005 | includes evaluating watchpoints, things will come to a | |
2006 | stop in the correct manner. */ | |
2007 | ||
2008 | write_pc (stop_pc - DECR_PC_AFTER_BREAK); | |
2009 | ||
2010 | remove_breakpoints (); | |
2011 | registers_changed (); | |
2012 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); /* Single step */ | |
2013 | ||
2014 | ecs->waiton_pid = ecs->pid; | |
2015 | ecs->wp = &(ecs->ws); | |
2016 | ecs->infwait_state = infwait_nonstep_watch_state; | |
104c1213 JM |
2017 | prepare_to_wait (ecs); |
2018 | return; | |
c5aa993b | 2019 | } |
c906108c | 2020 | |
c5aa993b JM |
2021 | /* It may be possible to simply continue after a watchpoint. */ |
2022 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
2023 | STOPPED_BY_WATCHPOINT (ecs->ws); | |
2024 | ||
2025 | ecs->stop_func_start = 0; | |
2026 | ecs->stop_func_end = 0; | |
2027 | ecs->stop_func_name = 0; | |
2028 | /* Don't care about return value; stop_func_start and stop_func_name | |
2029 | will both be 0 if it doesn't work. */ | |
2030 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
2031 | &ecs->stop_func_start, &ecs->stop_func_end); | |
2032 | ecs->stop_func_start += FUNCTION_START_OFFSET; | |
2033 | ecs->another_trap = 0; | |
2034 | bpstat_clear (&stop_bpstat); | |
2035 | stop_step = 0; | |
2036 | stop_stack_dummy = 0; | |
2037 | stop_print_frame = 1; | |
2038 | ecs->random_signal = 0; | |
2039 | stopped_by_random_signal = 0; | |
2040 | breakpoints_failed = 0; | |
2041 | ||
2042 | /* Look at the cause of the stop, and decide what to do. | |
2043 | The alternatives are: | |
2044 | 1) break; to really stop and return to the debugger, | |
2045 | 2) drop through to start up again | |
2046 | (set ecs->another_trap to 1 to single step once) | |
2047 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
2048 | will be made according to the signal handling tables. */ | |
2049 | ||
2050 | /* First, distinguish signals caused by the debugger from signals | |
2051 | that have to do with the program's own actions. | |
2052 | Note that breakpoint insns may cause SIGTRAP or SIGILL | |
2053 | or SIGEMT, depending on the operating system version. | |
2054 | Here we detect when a SIGILL or SIGEMT is really a breakpoint | |
2055 | and change it to SIGTRAP. */ | |
2056 | ||
2057 | if (stop_signal == TARGET_SIGNAL_TRAP | |
2058 | || (breakpoints_inserted && | |
2059 | (stop_signal == TARGET_SIGNAL_ILL | |
2060 | || stop_signal == TARGET_SIGNAL_EMT | |
2061 | )) | |
2062 | || stop_soon_quietly) | |
2063 | { | |
2064 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
2065 | { | |
2066 | stop_print_frame = 0; | |
104c1213 JM |
2067 | stop_stepping (ecs); |
2068 | return; | |
c5aa993b JM |
2069 | } |
2070 | if (stop_soon_quietly) | |
104c1213 JM |
2071 | { |
2072 | stop_stepping (ecs); | |
2073 | return; | |
2074 | } | |
c906108c | 2075 | |
c5aa993b JM |
2076 | /* Don't even think about breakpoints |
2077 | if just proceeded over a breakpoint. | |
c906108c | 2078 | |
c5aa993b JM |
2079 | However, if we are trying to proceed over a breakpoint |
2080 | and end up in sigtramp, then through_sigtramp_breakpoint | |
2081 | will be set and we should check whether we've hit the | |
2082 | step breakpoint. */ | |
2083 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected | |
2084 | && through_sigtramp_breakpoint == NULL) | |
2085 | bpstat_clear (&stop_bpstat); | |
2086 | else | |
2087 | { | |
2088 | /* See if there is a breakpoint at the current PC. */ | |
2089 | stop_bpstat = bpstat_stop_status | |
2090 | (&stop_pc, | |
6426a772 JM |
2091 | /* Pass TRUE if our reason for stopping is something other |
2092 | than hitting a breakpoint. We do this by checking that | |
2093 | 1) stepping is going on and 2) we didn't hit a breakpoint | |
2094 | in a signal handler without an intervening stop in | |
2095 | sigtramp, which is detected by a new stack pointer value | |
2096 | below any usual function calling stack adjustments. */ | |
c5aa993b | 2097 | (currently_stepping (ecs) |
c5aa993b | 2098 | && !(step_range_end |
6426a772 | 2099 | && INNER_THAN (read_sp (), (step_sp - 16)))) |
c5aa993b JM |
2100 | ); |
2101 | /* Following in case break condition called a | |
2102 | function. */ | |
2103 | stop_print_frame = 1; | |
2104 | } | |
c906108c | 2105 | |
c5aa993b JM |
2106 | if (stop_signal == TARGET_SIGNAL_TRAP) |
2107 | ecs->random_signal | |
2108 | = !(bpstat_explains_signal (stop_bpstat) | |
2109 | || trap_expected | |
2110 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P | |
2111 | && PC_IN_CALL_DUMMY (stop_pc, read_sp (), | |
2112 | FRAME_FP (get_current_frame ()))) | |
2113 | || (step_range_end && step_resume_breakpoint == NULL)); | |
2114 | ||
2115 | else | |
2116 | { | |
cd0fc7c3 | 2117 | ecs->random_signal |
c906108c | 2118 | = !(bpstat_explains_signal (stop_bpstat) |
c5aa993b JM |
2119 | /* End of a stack dummy. Some systems (e.g. Sony |
2120 | news) give another signal besides SIGTRAP, so | |
2121 | check here as well as above. */ | |
7a292a7a SS |
2122 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P |
2123 | && PC_IN_CALL_DUMMY (stop_pc, read_sp (), | |
2124 | FRAME_FP (get_current_frame ()))) | |
c5aa993b JM |
2125 | ); |
2126 | if (!ecs->random_signal) | |
2127 | stop_signal = TARGET_SIGNAL_TRAP; | |
2128 | } | |
2129 | } | |
c906108c | 2130 | |
c5aa993b JM |
2131 | /* When we reach this point, we've pretty much decided |
2132 | that the reason for stopping must've been a random | |
2133 | (unexpected) signal. */ | |
2134 | ||
2135 | else | |
2136 | ecs->random_signal = 1; | |
2137 | /* If a fork, vfork or exec event was seen, then there are two | |
2138 | possible responses we can make: | |
2139 | ||
2140 | 1. If a catchpoint triggers for the event (ecs->random_signal == 0), | |
2141 | then we must stop now and issue a prompt. We will resume | |
2142 | the inferior when the user tells us to. | |
2143 | 2. If no catchpoint triggers for the event (ecs->random_signal == 1), | |
2144 | then we must resume the inferior now and keep checking. | |
2145 | ||
2146 | In either case, we must take appropriate steps to "follow" the | |
2147 | the fork/vfork/exec when the inferior is resumed. For example, | |
2148 | if follow-fork-mode is "child", then we must detach from the | |
2149 | parent inferior and follow the new child inferior. | |
2150 | ||
2151 | In either case, setting pending_follow causes the next resume() | |
2152 | to take the appropriate following action. */ | |
2153 | process_event_stop_test: | |
2154 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
2155 | { | |
2156 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
2157 | { | |
2158 | trap_expected = 1; | |
2159 | stop_signal = TARGET_SIGNAL_0; | |
d4f3574e SS |
2160 | keep_going (ecs); |
2161 | return; | |
c5aa993b JM |
2162 | } |
2163 | } | |
2164 | else if (ecs->ws.kind == TARGET_WAITKIND_VFORKED) | |
2165 | { | |
2166 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
2167 | { | |
d4f3574e SS |
2168 | stop_signal = TARGET_SIGNAL_0; |
2169 | keep_going (ecs); | |
2170 | return; | |
c5aa993b JM |
2171 | } |
2172 | } | |
2173 | else if (ecs->ws.kind == TARGET_WAITKIND_EXECD) | |
2174 | { | |
2175 | pending_follow.kind = ecs->ws.kind; | |
2176 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
2177 | { | |
2178 | trap_expected = 1; | |
2179 | stop_signal = TARGET_SIGNAL_0; | |
d4f3574e SS |
2180 | keep_going (ecs); |
2181 | return; | |
c5aa993b JM |
2182 | } |
2183 | } | |
c906108c | 2184 | |
c5aa993b JM |
2185 | /* For the program's own signals, act according to |
2186 | the signal handling tables. */ | |
c906108c | 2187 | |
c5aa993b JM |
2188 | if (ecs->random_signal) |
2189 | { | |
2190 | /* Signal not for debugging purposes. */ | |
2191 | int printed = 0; | |
2192 | ||
2193 | stopped_by_random_signal = 1; | |
2194 | ||
2195 | if (signal_print[stop_signal]) | |
2196 | { | |
2197 | printed = 1; | |
2198 | target_terminal_ours_for_output (); | |
11cf8741 | 2199 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); |
c5aa993b JM |
2200 | } |
2201 | if (signal_stop[stop_signal]) | |
104c1213 JM |
2202 | { |
2203 | stop_stepping (ecs); | |
2204 | return; | |
2205 | } | |
c5aa993b JM |
2206 | /* If not going to stop, give terminal back |
2207 | if we took it away. */ | |
2208 | else if (printed) | |
2209 | target_terminal_inferior (); | |
2210 | ||
2211 | /* Clear the signal if it should not be passed. */ | |
2212 | if (signal_program[stop_signal] == 0) | |
2213 | stop_signal = TARGET_SIGNAL_0; | |
2214 | ||
a0b3c4fd JM |
2215 | /* I'm not sure whether this needs to be check_sigtramp2 or |
2216 | whether it could/should be keep_going. | |
2217 | ||
2218 | This used to jump to step_over_function if we are stepping, | |
2219 | which is wrong. | |
2220 | ||
2221 | Suppose the user does a `next' over a function call, and while | |
2222 | that call is in progress, the inferior receives a signal for | |
2223 | which GDB does not stop (i.e., signal_stop[SIG] is false). In | |
2224 | that case, when we reach this point, there is already a | |
2225 | step-resume breakpoint established, right where it should be: | |
2226 | immediately after the function call the user is "next"-ing | |
d4f3574e | 2227 | over. If we call step_over_function now, two bad things |
a0b3c4fd JM |
2228 | happen: |
2229 | ||
2230 | - we'll create a new breakpoint, at wherever the current | |
2231 | frame's return address happens to be. That could be | |
2232 | anywhere, depending on what function call happens to be on | |
2233 | the top of the stack at that point. Point is, it's probably | |
2234 | not where we need it. | |
2235 | ||
2236 | - the existing step-resume breakpoint (which is at the correct | |
2237 | address) will get orphaned: step_resume_breakpoint will point | |
2238 | to the new breakpoint, and the old step-resume breakpoint | |
2239 | will never be cleaned up. | |
2240 | ||
2241 | The old behavior was meant to help HP-UX single-step out of | |
2242 | sigtramps. It would place the new breakpoint at prev_pc, which | |
2243 | was certainly wrong. I don't know the details there, so fixing | |
2244 | this probably breaks that. As with anything else, it's up to | |
2245 | the HP-UX maintainer to furnish a fix that doesn't break other | |
2246 | platforms. --JimB, 20 May 1999 */ | |
104c1213 | 2247 | check_sigtramp2 (ecs); |
c5aa993b JM |
2248 | } |
2249 | ||
2250 | /* Handle cases caused by hitting a breakpoint. */ | |
2251 | { | |
2252 | CORE_ADDR jmp_buf_pc; | |
2253 | struct bpstat_what what; | |
2254 | ||
2255 | what = bpstat_what (stop_bpstat); | |
2256 | ||
2257 | if (what.call_dummy) | |
c906108c | 2258 | { |
c5aa993b JM |
2259 | stop_stack_dummy = 1; |
2260 | #ifdef HP_OS_BUG | |
2261 | trap_expected_after_continue = 1; | |
2262 | #endif | |
c906108c | 2263 | } |
c5aa993b JM |
2264 | |
2265 | switch (what.main_action) | |
c906108c | 2266 | { |
c5aa993b JM |
2267 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2268 | /* If we hit the breakpoint at longjmp, disable it for the | |
2269 | duration of this command. Then, install a temporary | |
2270 | breakpoint at the target of the jmp_buf. */ | |
2271 | disable_longjmp_breakpoint (); | |
2272 | remove_breakpoints (); | |
2273 | breakpoints_inserted = 0; | |
2274 | if (!GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
d4f3574e SS |
2275 | { |
2276 | keep_going (ecs); | |
2277 | return; | |
2278 | } | |
c5aa993b JM |
2279 | |
2280 | /* Need to blow away step-resume breakpoint, as it | |
2281 | interferes with us */ | |
2282 | if (step_resume_breakpoint != NULL) | |
c906108c | 2283 | { |
c5aa993b JM |
2284 | delete_breakpoint (step_resume_breakpoint); |
2285 | step_resume_breakpoint = NULL; | |
c906108c | 2286 | } |
c5aa993b JM |
2287 | /* Not sure whether we need to blow this away too, but probably |
2288 | it is like the step-resume breakpoint. */ | |
2289 | if (through_sigtramp_breakpoint != NULL) | |
c906108c | 2290 | { |
c5aa993b JM |
2291 | delete_breakpoint (through_sigtramp_breakpoint); |
2292 | through_sigtramp_breakpoint = NULL; | |
c906108c | 2293 | } |
c906108c | 2294 | |
c5aa993b JM |
2295 | #if 0 |
2296 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2297 | if (step_over_calls > 0) | |
2298 | set_longjmp_resume_breakpoint (jmp_buf_pc, | |
2299 | get_current_frame ()); | |
2300 | else | |
2301 | #endif /* 0 */ | |
2302 | set_longjmp_resume_breakpoint (jmp_buf_pc, NULL); | |
2303 | ecs->handling_longjmp = 1; /* FIXME */ | |
d4f3574e SS |
2304 | keep_going (ecs); |
2305 | return; | |
c906108c | 2306 | |
c5aa993b JM |
2307 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2308 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
2309 | remove_breakpoints (); | |
2310 | breakpoints_inserted = 0; | |
2311 | #if 0 | |
2312 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2313 | if (step_over_calls | |
2314 | && (INNER_THAN (FRAME_FP (get_current_frame ()), | |
2315 | step_frame_address))) | |
2316 | { | |
2317 | ecs->another_trap = 1; | |
d4f3574e SS |
2318 | keep_going (ecs); |
2319 | return; | |
c5aa993b JM |
2320 | } |
2321 | #endif /* 0 */ | |
2322 | disable_longjmp_breakpoint (); | |
2323 | ecs->handling_longjmp = 0; /* FIXME */ | |
2324 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2325 | break; | |
2326 | /* else fallthrough */ | |
c906108c | 2327 | |
c5aa993b JM |
2328 | case BPSTAT_WHAT_SINGLE: |
2329 | if (breakpoints_inserted) | |
c906108c | 2330 | { |
c5aa993b JM |
2331 | thread_step_needed = 1; |
2332 | remove_breakpoints (); | |
c906108c | 2333 | } |
c5aa993b JM |
2334 | breakpoints_inserted = 0; |
2335 | ecs->another_trap = 1; | |
2336 | /* Still need to check other stuff, at least the case | |
2337 | where we are stepping and step out of the right range. */ | |
2338 | break; | |
c906108c | 2339 | |
c5aa993b JM |
2340 | case BPSTAT_WHAT_STOP_NOISY: |
2341 | stop_print_frame = 1; | |
c906108c | 2342 | |
c5aa993b JM |
2343 | /* We are about to nuke the step_resume_breakpoint and |
2344 | through_sigtramp_breakpoint via the cleanup chain, so | |
2345 | no need to worry about it here. */ | |
c906108c | 2346 | |
104c1213 JM |
2347 | stop_stepping (ecs); |
2348 | return; | |
c906108c | 2349 | |
c5aa993b JM |
2350 | case BPSTAT_WHAT_STOP_SILENT: |
2351 | stop_print_frame = 0; | |
c906108c | 2352 | |
c5aa993b JM |
2353 | /* We are about to nuke the step_resume_breakpoint and |
2354 | through_sigtramp_breakpoint via the cleanup chain, so | |
2355 | no need to worry about it here. */ | |
c906108c | 2356 | |
104c1213 JM |
2357 | stop_stepping (ecs); |
2358 | return; | |
c906108c | 2359 | |
c5aa993b JM |
2360 | case BPSTAT_WHAT_STEP_RESUME: |
2361 | /* This proably demands a more elegant solution, but, yeah | |
2362 | right... | |
2363 | ||
2364 | This function's use of the simple variable | |
2365 | step_resume_breakpoint doesn't seem to accomodate | |
2366 | simultaneously active step-resume bp's, although the | |
2367 | breakpoint list certainly can. | |
2368 | ||
2369 | If we reach here and step_resume_breakpoint is already | |
2370 | NULL, then apparently we have multiple active | |
2371 | step-resume bp's. We'll just delete the breakpoint we | |
53a5351d JM |
2372 | stopped at, and carry on. |
2373 | ||
2374 | Correction: what the code currently does is delete a | |
2375 | step-resume bp, but it makes no effort to ensure that | |
2376 | the one deleted is the one currently stopped at. MVS */ | |
2377 | ||
c5aa993b JM |
2378 | if (step_resume_breakpoint == NULL) |
2379 | { | |
2380 | step_resume_breakpoint = | |
2381 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2382 | } | |
2383 | delete_breakpoint (step_resume_breakpoint); | |
2384 | step_resume_breakpoint = NULL; | |
2385 | break; | |
2386 | ||
2387 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
2388 | if (through_sigtramp_breakpoint) | |
2389 | delete_breakpoint (through_sigtramp_breakpoint); | |
2390 | through_sigtramp_breakpoint = NULL; | |
2391 | ||
2392 | /* If were waiting for a trap, hitting the step_resume_break | |
2393 | doesn't count as getting it. */ | |
2394 | if (trap_expected) | |
2395 | ecs->another_trap = 1; | |
2396 | break; | |
c906108c | 2397 | |
c5aa993b JM |
2398 | case BPSTAT_WHAT_CHECK_SHLIBS: |
2399 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2400 | #ifdef SOLIB_ADD | |
c906108c | 2401 | { |
c5aa993b JM |
2402 | /* Remove breakpoints, we eventually want to step over the |
2403 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2404 | breakpoint addresses via breakpoint_re_set. */ | |
2405 | if (breakpoints_inserted) | |
2406 | remove_breakpoints (); | |
c906108c | 2407 | breakpoints_inserted = 0; |
c906108c | 2408 | |
c5aa993b JM |
2409 | /* Check for any newly added shared libraries if we're |
2410 | supposed to be adding them automatically. */ | |
2411 | if (auto_solib_add) | |
c906108c | 2412 | { |
c5aa993b JM |
2413 | /* Switch terminal for any messages produced by |
2414 | breakpoint_re_set. */ | |
2415 | target_terminal_ours_for_output (); | |
2416 | SOLIB_ADD (NULL, 0, NULL); | |
2417 | target_terminal_inferior (); | |
c906108c | 2418 | } |
c5aa993b JM |
2419 | |
2420 | /* Try to reenable shared library breakpoints, additional | |
2421 | code segments in shared libraries might be mapped in now. */ | |
2422 | re_enable_breakpoints_in_shlibs (); | |
2423 | ||
2424 | /* If requested, stop when the dynamic linker notifies | |
2425 | gdb of events. This allows the user to get control | |
2426 | and place breakpoints in initializer routines for | |
2427 | dynamically loaded objects (among other things). */ | |
2428 | if (stop_on_solib_events) | |
c906108c | 2429 | { |
104c1213 JM |
2430 | stop_stepping (ecs); |
2431 | return; | |
c906108c SS |
2432 | } |
2433 | ||
c5aa993b JM |
2434 | /* If we stopped due to an explicit catchpoint, then the |
2435 | (see above) call to SOLIB_ADD pulled in any symbols | |
2436 | from a newly-loaded library, if appropriate. | |
2437 | ||
2438 | We do want the inferior to stop, but not where it is | |
2439 | now, which is in the dynamic linker callback. Rather, | |
2440 | we would like it stop in the user's program, just after | |
2441 | the call that caused this catchpoint to trigger. That | |
2442 | gives the user a more useful vantage from which to | |
2443 | examine their program's state. */ | |
2444 | else if (what.main_action == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
2445 | { | |
2446 | /* ??rehrauer: If I could figure out how to get the | |
2447 | right return PC from here, we could just set a temp | |
2448 | breakpoint and resume. I'm not sure we can without | |
2449 | cracking open the dld's shared libraries and sniffing | |
2450 | their unwind tables and text/data ranges, and that's | |
2451 | not a terribly portable notion. | |
2452 | ||
2453 | Until that time, we must step the inferior out of the | |
2454 | dld callback, and also out of the dld itself (and any | |
2455 | code or stubs in libdld.sl, such as "shl_load" and | |
2456 | friends) until we reach non-dld code. At that point, | |
2457 | we can stop stepping. */ | |
2458 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2459 | &ecs->stepping_through_solib_catchpoints); | |
2460 | ecs->stepping_through_solib_after_catch = 1; | |
2461 | ||
2462 | /* Be sure to lift all breakpoints, so the inferior does | |
2463 | actually step past this point... */ | |
2464 | ecs->another_trap = 1; | |
2465 | break; | |
2466 | } | |
2467 | else | |
c906108c | 2468 | { |
c5aa993b | 2469 | /* We want to step over this breakpoint, then keep going. */ |
cd0fc7c3 | 2470 | ecs->another_trap = 1; |
c5aa993b | 2471 | break; |
c906108c | 2472 | } |
c5aa993b JM |
2473 | } |
2474 | #endif | |
2475 | break; | |
c906108c | 2476 | |
c5aa993b JM |
2477 | case BPSTAT_WHAT_LAST: |
2478 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2479 | |
c5aa993b JM |
2480 | case BPSTAT_WHAT_KEEP_CHECKING: |
2481 | break; | |
2482 | } | |
2483 | } | |
c906108c | 2484 | |
c5aa993b JM |
2485 | /* We come here if we hit a breakpoint but should not |
2486 | stop for it. Possibly we also were stepping | |
2487 | and should stop for that. So fall through and | |
2488 | test for stepping. But, if not stepping, | |
2489 | do not stop. */ | |
c906108c | 2490 | |
c5aa993b JM |
2491 | /* Are we stepping to get the inferior out of the dynamic |
2492 | linker's hook (and possibly the dld itself) after catching | |
2493 | a shlib event? */ | |
2494 | if (ecs->stepping_through_solib_after_catch) | |
2495 | { | |
2496 | #if defined(SOLIB_ADD) | |
2497 | /* Have we reached our destination? If not, keep going. */ | |
2498 | if (SOLIB_IN_DYNAMIC_LINKER (ecs->pid, stop_pc)) | |
2499 | { | |
2500 | ecs->another_trap = 1; | |
d4f3574e SS |
2501 | keep_going (ecs); |
2502 | return; | |
c5aa993b JM |
2503 | } |
2504 | #endif | |
2505 | /* Else, stop and report the catchpoint(s) whose triggering | |
2506 | caused us to begin stepping. */ | |
2507 | ecs->stepping_through_solib_after_catch = 0; | |
2508 | bpstat_clear (&stop_bpstat); | |
2509 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2510 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2511 | stop_print_frame = 1; | |
104c1213 JM |
2512 | stop_stepping (ecs); |
2513 | return; | |
c5aa993b | 2514 | } |
c906108c | 2515 | |
c5aa993b JM |
2516 | if (!CALL_DUMMY_BREAKPOINT_OFFSET_P) |
2517 | { | |
2518 | /* This is the old way of detecting the end of the stack dummy. | |
2519 | An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets | |
2520 | handled above. As soon as we can test it on all of them, all | |
2521 | architectures should define it. */ | |
2522 | ||
2523 | /* If this is the breakpoint at the end of a stack dummy, | |
2524 | just stop silently, unless the user was doing an si/ni, in which | |
2525 | case she'd better know what she's doing. */ | |
2526 | ||
2527 | if (CALL_DUMMY_HAS_COMPLETED (stop_pc, read_sp (), | |
2528 | FRAME_FP (get_current_frame ())) | |
2529 | && !step_range_end) | |
2530 | { | |
c906108c | 2531 | stop_print_frame = 0; |
c5aa993b JM |
2532 | stop_stack_dummy = 1; |
2533 | #ifdef HP_OS_BUG | |
2534 | trap_expected_after_continue = 1; | |
2535 | #endif | |
104c1213 JM |
2536 | stop_stepping (ecs); |
2537 | return; | |
c5aa993b JM |
2538 | } |
2539 | } | |
c906108c | 2540 | |
c5aa993b | 2541 | if (step_resume_breakpoint) |
104c1213 JM |
2542 | { |
2543 | /* Having a step-resume breakpoint overrides anything | |
2544 | else having to do with stepping commands until | |
2545 | that breakpoint is reached. */ | |
2546 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2547 | whether it could/should be keep_going. */ | |
2548 | check_sigtramp2 (ecs); | |
d4f3574e SS |
2549 | keep_going (ecs); |
2550 | return; | |
104c1213 JM |
2551 | } |
2552 | ||
c5aa993b | 2553 | if (step_range_end == 0) |
104c1213 JM |
2554 | { |
2555 | /* Likewise if we aren't even stepping. */ | |
2556 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2557 | whether it could/should be keep_going. */ | |
2558 | check_sigtramp2 (ecs); | |
d4f3574e SS |
2559 | keep_going (ecs); |
2560 | return; | |
104c1213 | 2561 | } |
c5aa993b JM |
2562 | |
2563 | /* If stepping through a line, keep going if still within it. | |
2564 | ||
2565 | Note that step_range_end is the address of the first instruction | |
2566 | beyond the step range, and NOT the address of the last instruction | |
2567 | within it! */ | |
2568 | if (stop_pc >= step_range_start | |
2569 | && stop_pc < step_range_end) | |
2570 | { | |
2571 | /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal. | |
2572 | So definately need to check for sigtramp here. */ | |
104c1213 | 2573 | check_sigtramp2 (ecs); |
d4f3574e SS |
2574 | keep_going (ecs); |
2575 | return; | |
c5aa993b | 2576 | } |
c906108c | 2577 | |
c5aa993b | 2578 | /* We stepped out of the stepping range. */ |
c906108c | 2579 | |
c5aa993b JM |
2580 | /* If we are stepping at the source level and entered the runtime |
2581 | loader dynamic symbol resolution code, we keep on single stepping | |
2582 | until we exit the run time loader code and reach the callee's | |
2583 | address. */ | |
2584 | if (step_over_calls < 0 && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) | |
d4f3574e SS |
2585 | { |
2586 | CORE_ADDR pc_after_resolver = SKIP_SOLIB_RESOLVER (stop_pc); | |
2587 | ||
2588 | if (pc_after_resolver) | |
2589 | { | |
2590 | /* Set up a step-resume breakpoint at the address | |
2591 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2592 | struct symtab_and_line sr_sal; | |
2593 | INIT_SAL (&sr_sal); | |
2594 | sr_sal.pc = pc_after_resolver; | |
2595 | ||
2596 | check_for_old_step_resume_breakpoint (); | |
2597 | step_resume_breakpoint = | |
2598 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2599 | if (breakpoints_inserted) | |
2600 | insert_breakpoints (); | |
2601 | } | |
2602 | ||
2603 | keep_going (ecs); | |
2604 | return; | |
2605 | } | |
c906108c | 2606 | |
c5aa993b JM |
2607 | /* We can't update step_sp every time through the loop, because |
2608 | reading the stack pointer would slow down stepping too much. | |
2609 | But we can update it every time we leave the step range. */ | |
2610 | ecs->update_step_sp = 1; | |
c906108c | 2611 | |
c5aa993b JM |
2612 | /* Did we just take a signal? */ |
2613 | if (IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
2614 | && !IN_SIGTRAMP (prev_pc, prev_func_name) | |
2615 | && INNER_THAN (read_sp (), step_sp)) | |
2616 | { | |
2617 | /* We've just taken a signal; go until we are back to | |
2618 | the point where we took it and one more. */ | |
c906108c | 2619 | |
c5aa993b JM |
2620 | /* Note: The test above succeeds not only when we stepped |
2621 | into a signal handler, but also when we step past the last | |
2622 | statement of a signal handler and end up in the return stub | |
2623 | of the signal handler trampoline. To distinguish between | |
2624 | these two cases, check that the frame is INNER_THAN the | |
2625 | previous one below. pai/1997-09-11 */ | |
c906108c | 2626 | |
c906108c | 2627 | |
c5aa993b JM |
2628 | { |
2629 | CORE_ADDR current_frame = FRAME_FP (get_current_frame ()); | |
c906108c | 2630 | |
c5aa993b JM |
2631 | if (INNER_THAN (current_frame, step_frame_address)) |
2632 | { | |
2633 | /* We have just taken a signal; go until we are back to | |
2634 | the point where we took it and one more. */ | |
c906108c | 2635 | |
c5aa993b JM |
2636 | /* This code is needed at least in the following case: |
2637 | The user types "next" and then a signal arrives (before | |
2638 | the "next" is done). */ | |
c906108c | 2639 | |
c5aa993b JM |
2640 | /* Note that if we are stopped at a breakpoint, then we need |
2641 | the step_resume breakpoint to override any breakpoints at | |
2642 | the same location, so that we will still step over the | |
2643 | breakpoint even though the signal happened. */ | |
2644 | struct symtab_and_line sr_sal; | |
c906108c | 2645 | |
c5aa993b JM |
2646 | INIT_SAL (&sr_sal); |
2647 | sr_sal.symtab = NULL; | |
2648 | sr_sal.line = 0; | |
2649 | sr_sal.pc = prev_pc; | |
2650 | /* We could probably be setting the frame to | |
2651 | step_frame_address; I don't think anyone thought to | |
2652 | try it. */ | |
a0b3c4fd | 2653 | check_for_old_step_resume_breakpoint (); |
c5aa993b JM |
2654 | step_resume_breakpoint = |
2655 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2656 | if (breakpoints_inserted) | |
2657 | insert_breakpoints (); | |
c906108c | 2658 | } |
c5aa993b | 2659 | else |
c906108c | 2660 | { |
c5aa993b JM |
2661 | /* We just stepped out of a signal handler and into |
2662 | its calling trampoline. | |
2663 | ||
d4f3574e | 2664 | Normally, we'd call step_over_function from |
c5aa993b JM |
2665 | here, but for some reason GDB can't unwind the |
2666 | stack correctly to find the real PC for the point | |
2667 | user code where the signal trampoline will return | |
2668 | -- FRAME_SAVED_PC fails, at least on HP-UX 10.20. | |
2669 | But signal trampolines are pretty small stubs of | |
2670 | code, anyway, so it's OK instead to just | |
2671 | single-step out. Note: assuming such trampolines | |
2672 | don't exhibit recursion on any platform... */ | |
2673 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
2674 | &ecs->stop_func_start, | |
2675 | &ecs->stop_func_end); | |
2676 | /* Readjust stepping range */ | |
2677 | step_range_start = ecs->stop_func_start; | |
2678 | step_range_end = ecs->stop_func_end; | |
2679 | ecs->stepping_through_sigtramp = 1; | |
c906108c | 2680 | } |
c906108c SS |
2681 | } |
2682 | ||
c906108c | 2683 | |
c5aa993b JM |
2684 | /* If this is stepi or nexti, make sure that the stepping range |
2685 | gets us past that instruction. */ | |
2686 | if (step_range_end == 1) | |
2687 | /* FIXME: Does this run afoul of the code below which, if | |
2688 | we step into the middle of a line, resets the stepping | |
2689 | range? */ | |
2690 | step_range_end = (step_range_start = prev_pc) + 1; | |
c906108c | 2691 | |
c5aa993b | 2692 | ecs->remove_breakpoints_on_following_step = 1; |
d4f3574e SS |
2693 | keep_going (ecs); |
2694 | return; | |
c5aa993b | 2695 | } |
c906108c | 2696 | |
c5aa993b JM |
2697 | if (stop_pc == ecs->stop_func_start /* Quick test */ |
2698 | || (in_prologue (stop_pc, ecs->stop_func_start) && | |
2699 | !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2700 | || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name) | |
2701 | || ecs->stop_func_name == 0) | |
2702 | { | |
2703 | /* It's a subroutine call. */ | |
c906108c | 2704 | |
c5aa993b | 2705 | if (step_over_calls == 0) |
c906108c | 2706 | { |
c5aa993b JM |
2707 | /* I presume that step_over_calls is only 0 when we're |
2708 | supposed to be stepping at the assembly language level | |
2709 | ("stepi"). Just stop. */ | |
2710 | stop_step = 1; | |
11cf8741 | 2711 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2712 | stop_stepping (ecs); |
2713 | return; | |
c5aa993b | 2714 | } |
c906108c | 2715 | |
c5aa993b | 2716 | if (step_over_calls > 0 || IGNORE_HELPER_CALL (stop_pc)) |
d4f3574e SS |
2717 | { |
2718 | /* We're doing a "next". */ | |
2719 | step_over_function (ecs); | |
2720 | keep_going (ecs); | |
2721 | return; | |
2722 | } | |
c5aa993b JM |
2723 | |
2724 | /* If we are in a function call trampoline (a stub between | |
2725 | the calling routine and the real function), locate the real | |
2726 | function. That's what tells us (a) whether we want to step | |
2727 | into it at all, and (b) what prologue we want to run to | |
2728 | the end of, if we do step into it. */ | |
2729 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2730 | if (tmp != 0) | |
2731 | ecs->stop_func_start = tmp; | |
2732 | else | |
2733 | { | |
2734 | tmp = DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc); | |
2735 | if (tmp) | |
c906108c | 2736 | { |
c5aa993b JM |
2737 | struct symtab_and_line xxx; |
2738 | /* Why isn't this s_a_l called "sr_sal", like all of the | |
2739 | other s_a_l's where this code is duplicated? */ | |
2740 | INIT_SAL (&xxx); /* initialize to zeroes */ | |
2741 | xxx.pc = tmp; | |
2742 | xxx.section = find_pc_overlay (xxx.pc); | |
a0b3c4fd | 2743 | check_for_old_step_resume_breakpoint (); |
c906108c | 2744 | step_resume_breakpoint = |
c5aa993b JM |
2745 | set_momentary_breakpoint (xxx, NULL, bp_step_resume); |
2746 | insert_breakpoints (); | |
d4f3574e SS |
2747 | keep_going (ecs); |
2748 | return; | |
c906108c SS |
2749 | } |
2750 | } | |
2751 | ||
c5aa993b JM |
2752 | /* If we have line number information for the function we |
2753 | are thinking of stepping into, step into it. | |
c906108c | 2754 | |
c5aa993b JM |
2755 | If there are several symtabs at that PC (e.g. with include |
2756 | files), just want to know whether *any* of them have line | |
2757 | numbers. find_pc_line handles this. */ | |
2758 | { | |
2759 | struct symtab_and_line tmp_sal; | |
c906108c | 2760 | |
c5aa993b JM |
2761 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2762 | if (tmp_sal.line != 0) | |
c2c6d25f JM |
2763 | { |
2764 | step_into_function (ecs); | |
2765 | return; | |
2766 | } | |
c906108c | 2767 | } |
d4f3574e SS |
2768 | step_over_function (ecs); |
2769 | keep_going (ecs); | |
2770 | return; | |
c906108c | 2771 | |
c5aa993b | 2772 | } |
c906108c | 2773 | |
c5aa993b | 2774 | /* We've wandered out of the step range. */ |
c906108c | 2775 | |
c5aa993b | 2776 | ecs->sal = find_pc_line (stop_pc, 0); |
c906108c | 2777 | |
c5aa993b JM |
2778 | if (step_range_end == 1) |
2779 | { | |
2780 | /* It is stepi or nexti. We always want to stop stepping after | |
2781 | one instruction. */ | |
2782 | stop_step = 1; | |
11cf8741 | 2783 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2784 | stop_stepping (ecs); |
2785 | return; | |
c5aa993b | 2786 | } |
c906108c | 2787 | |
c5aa993b JM |
2788 | /* If we're in the return path from a shared library trampoline, |
2789 | we want to proceed through the trampoline when stepping. */ | |
2790 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2791 | { | |
2792 | CORE_ADDR tmp; | |
c906108c | 2793 | |
c5aa993b JM |
2794 | /* Determine where this trampoline returns. */ |
2795 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
c906108c | 2796 | |
c5aa993b JM |
2797 | /* Only proceed through if we know where it's going. */ |
2798 | if (tmp) | |
2799 | { | |
2800 | /* And put the step-breakpoint there and go until there. */ | |
2801 | struct symtab_and_line sr_sal; | |
c906108c | 2802 | |
c5aa993b JM |
2803 | INIT_SAL (&sr_sal); /* initialize to zeroes */ |
2804 | sr_sal.pc = tmp; | |
2805 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2806 | /* Do not specify what the fp should be when we stop | |
2807 | since on some machines the prologue | |
2808 | is where the new fp value is established. */ | |
a0b3c4fd | 2809 | check_for_old_step_resume_breakpoint (); |
c5aa993b JM |
2810 | step_resume_breakpoint = |
2811 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2812 | if (breakpoints_inserted) | |
2813 | insert_breakpoints (); | |
c906108c | 2814 | |
c5aa993b JM |
2815 | /* Restart without fiddling with the step ranges or |
2816 | other state. */ | |
d4f3574e SS |
2817 | keep_going (ecs); |
2818 | return; | |
c5aa993b JM |
2819 | } |
2820 | } | |
c906108c | 2821 | |
c5aa993b | 2822 | if (ecs->sal.line == 0) |
c906108c | 2823 | { |
c5aa993b JM |
2824 | /* We have no line number information. That means to stop |
2825 | stepping (does this always happen right after one instruction, | |
2826 | when we do "s" in a function with no line numbers, | |
2827 | or can this happen as a result of a return or longjmp?). */ | |
2828 | stop_step = 1; | |
11cf8741 | 2829 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2830 | stop_stepping (ecs); |
2831 | return; | |
c906108c SS |
2832 | } |
2833 | ||
c5aa993b JM |
2834 | if ((stop_pc == ecs->sal.pc) |
2835 | && (ecs->current_line != ecs->sal.line || ecs->current_symtab != ecs->sal.symtab)) | |
2836 | { | |
2837 | /* We are at the start of a different line. So stop. Note that | |
2838 | we don't stop if we step into the middle of a different line. | |
2839 | That is said to make things like for (;;) statements work | |
2840 | better. */ | |
2841 | stop_step = 1; | |
11cf8741 | 2842 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2843 | stop_stepping (ecs); |
2844 | return; | |
c5aa993b | 2845 | } |
c906108c | 2846 | |
c5aa993b | 2847 | /* We aren't done stepping. |
c906108c | 2848 | |
c5aa993b JM |
2849 | Optimize by setting the stepping range to the line. |
2850 | (We might not be in the original line, but if we entered a | |
2851 | new line in mid-statement, we continue stepping. This makes | |
2852 | things like for(;;) statements work better.) */ | |
c906108c | 2853 | |
c5aa993b JM |
2854 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
2855 | { | |
2856 | /* If this is the last line of the function, don't keep stepping | |
2857 | (it would probably step us out of the function). | |
2858 | This is particularly necessary for a one-line function, | |
2859 | in which after skipping the prologue we better stop even though | |
2860 | we will be in mid-line. */ | |
2861 | stop_step = 1; | |
11cf8741 | 2862 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2863 | stop_stepping (ecs); |
2864 | return; | |
c5aa993b JM |
2865 | } |
2866 | step_range_start = ecs->sal.pc; | |
2867 | step_range_end = ecs->sal.end; | |
2868 | step_frame_address = FRAME_FP (get_current_frame ()); | |
2869 | ecs->current_line = ecs->sal.line; | |
2870 | ecs->current_symtab = ecs->sal.symtab; | |
2871 | ||
2872 | /* In the case where we just stepped out of a function into the middle | |
2873 | of a line of the caller, continue stepping, but step_frame_address | |
2874 | must be modified to current frame */ | |
2875 | { | |
2876 | CORE_ADDR current_frame = FRAME_FP (get_current_frame ()); | |
2877 | if (!(INNER_THAN (current_frame, step_frame_address))) | |
2878 | step_frame_address = current_frame; | |
2879 | } | |
c906108c | 2880 | |
d4f3574e | 2881 | keep_going (ecs); |
cd0fc7c3 | 2882 | |
104c1213 | 2883 | } /* extra brace, to preserve old indentation */ |
104c1213 JM |
2884 | } |
2885 | ||
2886 | /* Are we in the middle of stepping? */ | |
2887 | ||
2888 | static int | |
2889 | currently_stepping (struct execution_control_state *ecs) | |
2890 | { | |
2891 | return ((through_sigtramp_breakpoint == NULL | |
2892 | && !ecs->handling_longjmp | |
2893 | && ((step_range_end && step_resume_breakpoint == NULL) | |
2894 | || trap_expected)) | |
2895 | || ecs->stepping_through_solib_after_catch | |
2896 | || bpstat_should_step ()); | |
2897 | } | |
c906108c | 2898 | |
104c1213 JM |
2899 | static void |
2900 | check_sigtramp2 (struct execution_control_state *ecs) | |
2901 | { | |
2902 | if (trap_expected | |
2903 | && IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
2904 | && !IN_SIGTRAMP (prev_pc, prev_func_name) | |
2905 | && INNER_THAN (read_sp (), step_sp)) | |
2906 | { | |
2907 | /* What has happened here is that we have just stepped the | |
2908 | inferior with a signal (because it is a signal which | |
2909 | shouldn't make us stop), thus stepping into sigtramp. | |
2910 | ||
2911 | So we need to set a step_resume_break_address breakpoint and | |
2912 | continue until we hit it, and then step. FIXME: This should | |
2913 | be more enduring than a step_resume breakpoint; we should | |
2914 | know that we will later need to keep going rather than | |
2915 | re-hitting the breakpoint here (see the testsuite, | |
2916 | gdb.base/signals.exp where it says "exceedingly difficult"). */ | |
2917 | ||
2918 | struct symtab_and_line sr_sal; | |
2919 | ||
2920 | INIT_SAL (&sr_sal); /* initialize to zeroes */ | |
2921 | sr_sal.pc = prev_pc; | |
2922 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2923 | /* We perhaps could set the frame if we kept track of what the | |
2924 | frame corresponding to prev_pc was. But we don't, so don't. */ | |
2925 | through_sigtramp_breakpoint = | |
2926 | set_momentary_breakpoint (sr_sal, NULL, bp_through_sigtramp); | |
2927 | if (breakpoints_inserted) | |
2928 | insert_breakpoints (); | |
cd0fc7c3 | 2929 | |
104c1213 JM |
2930 | ecs->remove_breakpoints_on_following_step = 1; |
2931 | ecs->another_trap = 1; | |
2932 | } | |
2933 | } | |
2934 | ||
c2c6d25f JM |
2935 | /* Subroutine call with source code we should not step over. Do step |
2936 | to the first line of code in it. */ | |
2937 | ||
2938 | static void | |
2939 | step_into_function (struct execution_control_state *ecs) | |
2940 | { | |
2941 | struct symtab *s; | |
2942 | struct symtab_and_line sr_sal; | |
2943 | ||
2944 | s = find_pc_symtab (stop_pc); | |
2945 | if (s && s->language != language_asm) | |
2946 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
2947 | ||
2948 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
2949 | /* Use the step_resume_break to step until the end of the prologue, | |
2950 | even if that involves jumps (as it seems to on the vax under | |
2951 | 4.2). */ | |
2952 | /* If the prologue ends in the middle of a source line, continue to | |
2953 | the end of that source line (if it is still within the function). | |
2954 | Otherwise, just go to end of prologue. */ | |
2955 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP | |
2956 | /* no, don't either. It skips any code that's legitimately on the | |
2957 | first line. */ | |
2958 | #else | |
2959 | if (ecs->sal.end | |
2960 | && ecs->sal.pc != ecs->stop_func_start | |
2961 | && ecs->sal.end < ecs->stop_func_end) | |
2962 | ecs->stop_func_start = ecs->sal.end; | |
2963 | #endif | |
2964 | ||
2965 | if (ecs->stop_func_start == stop_pc) | |
2966 | { | |
2967 | /* We are already there: stop now. */ | |
2968 | stop_step = 1; | |
11cf8741 | 2969 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
2970 | stop_stepping (ecs); |
2971 | return; | |
2972 | } | |
2973 | else | |
2974 | { | |
2975 | /* Put the step-breakpoint there and go until there. */ | |
2976 | INIT_SAL (&sr_sal); /* initialize to zeroes */ | |
2977 | sr_sal.pc = ecs->stop_func_start; | |
2978 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
2979 | /* Do not specify what the fp should be when we stop since on | |
2980 | some machines the prologue is where the new fp value is | |
2981 | established. */ | |
2982 | check_for_old_step_resume_breakpoint (); | |
2983 | step_resume_breakpoint = | |
2984 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2985 | if (breakpoints_inserted) | |
2986 | insert_breakpoints (); | |
2987 | ||
2988 | /* And make sure stepping stops right away then. */ | |
2989 | step_range_end = step_range_start; | |
2990 | } | |
2991 | keep_going (ecs); | |
2992 | } | |
d4f3574e SS |
2993 | |
2994 | /* We've just entered a callee, and we wish to resume until it returns | |
2995 | to the caller. Setting a step_resume breakpoint on the return | |
2996 | address will catch a return from the callee. | |
2997 | ||
2998 | However, if the callee is recursing, we want to be careful not to | |
2999 | catch returns of those recursive calls, but only of THIS instance | |
3000 | of the call. | |
3001 | ||
3002 | To do this, we set the step_resume bp's frame to our current | |
3003 | caller's frame (step_frame_address, which is set by the "next" or | |
3004 | "until" command, before execution begins). */ | |
3005 | ||
3006 | static void | |
3007 | step_over_function (struct execution_control_state *ecs) | |
3008 | { | |
3009 | struct symtab_and_line sr_sal; | |
3010 | ||
3011 | INIT_SAL (&sr_sal); /* initialize to zeros */ | |
3012 | sr_sal.pc = ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ())); | |
3013 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
3014 | ||
3015 | check_for_old_step_resume_breakpoint (); | |
3016 | step_resume_breakpoint = | |
3017 | set_momentary_breakpoint (sr_sal, get_current_frame (), bp_step_resume); | |
3018 | ||
3019 | if (!IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc)) | |
3020 | step_resume_breakpoint->frame = step_frame_address; | |
3021 | ||
3022 | if (breakpoints_inserted) | |
3023 | insert_breakpoints (); | |
3024 | } | |
3025 | ||
104c1213 JM |
3026 | static void |
3027 | stop_stepping (struct execution_control_state *ecs) | |
3028 | { | |
c906108c SS |
3029 | if (target_has_execution) |
3030 | { | |
3031 | /* Are we stopping for a vfork event? We only stop when we see | |
3032 | the child's event. However, we may not yet have seen the | |
104c1213 JM |
3033 | parent's event. And, inferior_pid is still set to the |
3034 | parent's pid, until we resume again and follow either the | |
3035 | parent or child. | |
c906108c SS |
3036 | |
3037 | To ensure that we can really touch inferior_pid (aka, the | |
3038 | parent process) -- which calls to functions like read_pc | |
3039 | implicitly do -- wait on the parent if necessary. */ | |
3040 | if ((pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
3041 | && !pending_follow.fork_event.saw_parent_fork) | |
3042 | { | |
3043 | int parent_pid; | |
3044 | ||
3045 | do | |
3046 | { | |
3047 | if (target_wait_hook) | |
cd0fc7c3 | 3048 | parent_pid = target_wait_hook (-1, &(ecs->ws)); |
c906108c | 3049 | else |
cd0fc7c3 | 3050 | parent_pid = target_wait (-1, &(ecs->ws)); |
c906108c SS |
3051 | } |
3052 | while (parent_pid != inferior_pid); | |
3053 | } | |
3054 | ||
c906108c | 3055 | /* Assuming the inferior still exists, set these up for next |
c5aa993b JM |
3056 | time, just like we did above if we didn't break out of the |
3057 | loop. */ | |
c906108c | 3058 | prev_pc = read_pc (); |
cd0fc7c3 SS |
3059 | prev_func_start = ecs->stop_func_start; |
3060 | prev_func_name = ecs->stop_func_name; | |
c906108c | 3061 | } |
104c1213 | 3062 | |
cd0fc7c3 SS |
3063 | /* Let callers know we don't want to wait for the inferior anymore. */ |
3064 | ecs->wait_some_more = 0; | |
3065 | } | |
3066 | ||
d4f3574e SS |
3067 | /* This function handles various cases where we need to continue |
3068 | waiting for the inferior. */ | |
3069 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
3070 | ||
3071 | static void | |
3072 | keep_going (struct execution_control_state *ecs) | |
3073 | { | |
3074 | /* ??rehrauer: ttrace on HP-UX theoretically allows one to debug a | |
3075 | vforked child between its creation and subsequent exit or call to | |
3076 | exec(). However, I had big problems in this rather creaky exec | |
3077 | engine, getting that to work. The fundamental problem is that | |
3078 | I'm trying to debug two processes via an engine that only | |
3079 | understands a single process with possibly multiple threads. | |
3080 | ||
3081 | Hence, this spot is known to have problems when | |
3082 | target_can_follow_vfork_prior_to_exec returns 1. */ | |
3083 | ||
3084 | /* Save the pc before execution, to compare with pc after stop. */ | |
3085 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ | |
3086 | prev_func_start = ecs->stop_func_start; /* Ok, since if DECR_PC_AFTER | |
3087 | BREAK is defined, the | |
3088 | original pc would not have | |
3089 | been at the start of a | |
3090 | function. */ | |
3091 | prev_func_name = ecs->stop_func_name; | |
3092 | ||
3093 | if (ecs->update_step_sp) | |
3094 | step_sp = read_sp (); | |
3095 | ecs->update_step_sp = 0; | |
3096 | ||
3097 | /* If we did not do break;, it means we should keep running the | |
3098 | inferior and not return to debugger. */ | |
3099 | ||
3100 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
3101 | { | |
3102 | /* We took a signal (which we are supposed to pass through to | |
3103 | the inferior, else we'd have done a break above) and we | |
3104 | haven't yet gotten our trap. Simply continue. */ | |
3105 | resume (currently_stepping (ecs), stop_signal); | |
3106 | } | |
3107 | else | |
3108 | { | |
3109 | /* Either the trap was not expected, but we are continuing | |
3110 | anyway (the user asked that this signal be passed to the | |
3111 | child) | |
3112 | -- or -- | |
3113 | The signal was SIGTRAP, e.g. it was our signal, but we | |
3114 | decided we should resume from it. | |
3115 | ||
3116 | We're going to run this baby now! | |
3117 | ||
3118 | Insert breakpoints now, unless we are trying to one-proceed | |
3119 | past a breakpoint. */ | |
3120 | /* If we've just finished a special step resume and we don't | |
3121 | want to hit a breakpoint, pull em out. */ | |
3122 | if (step_resume_breakpoint == NULL | |
3123 | && through_sigtramp_breakpoint == NULL | |
3124 | && ecs->remove_breakpoints_on_following_step) | |
3125 | { | |
3126 | ecs->remove_breakpoints_on_following_step = 0; | |
3127 | remove_breakpoints (); | |
3128 | breakpoints_inserted = 0; | |
3129 | } | |
3130 | else if (!breakpoints_inserted && | |
3131 | (through_sigtramp_breakpoint != NULL || !ecs->another_trap)) | |
3132 | { | |
3133 | breakpoints_failed = insert_breakpoints (); | |
3134 | if (breakpoints_failed) | |
3135 | { | |
3136 | stop_stepping (ecs); | |
3137 | return; | |
3138 | } | |
3139 | breakpoints_inserted = 1; | |
3140 | } | |
3141 | ||
3142 | trap_expected = ecs->another_trap; | |
3143 | ||
3144 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
3145 | specifies that such a signal should be delivered to the | |
3146 | target program). | |
3147 | ||
3148 | Typically, this would occure when a user is debugging a | |
3149 | target monitor on a simulator: the target monitor sets a | |
3150 | breakpoint; the simulator encounters this break-point and | |
3151 | halts the simulation handing control to GDB; GDB, noteing | |
3152 | that the break-point isn't valid, returns control back to the | |
3153 | simulator; the simulator then delivers the hardware | |
3154 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
3155 | ||
3156 | if (stop_signal == TARGET_SIGNAL_TRAP | |
3157 | && !signal_program[stop_signal]) | |
3158 | stop_signal = TARGET_SIGNAL_0; | |
3159 | ||
3160 | #ifdef SHIFT_INST_REGS | |
3161 | /* I'm not sure when this following segment applies. I do know, | |
3162 | now, that we shouldn't rewrite the regs when we were stopped | |
3163 | by a random signal from the inferior process. */ | |
3164 | /* FIXME: Shouldn't this be based on the valid bit of the SXIP? | |
3165 | (this is only used on the 88k). */ | |
3166 | ||
3167 | if (!bpstat_explains_signal (stop_bpstat) | |
3168 | && (stop_signal != TARGET_SIGNAL_CHLD) | |
3169 | && !stopped_by_random_signal) | |
3170 | SHIFT_INST_REGS (); | |
3171 | #endif /* SHIFT_INST_REGS */ | |
3172 | ||
3173 | resume (currently_stepping (ecs), stop_signal); | |
3174 | } | |
3175 | ||
3176 | prepare_to_wait (ecs); | |
3177 | } | |
3178 | ||
104c1213 JM |
3179 | /* This function normally comes after a resume, before |
3180 | handle_inferior_event exits. It takes care of any last bits of | |
3181 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 3182 | |
104c1213 JM |
3183 | static void |
3184 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 3185 | { |
104c1213 JM |
3186 | if (ecs->infwait_state == infwait_normal_state) |
3187 | { | |
3188 | overlay_cache_invalid = 1; | |
3189 | ||
3190 | /* We have to invalidate the registers BEFORE calling | |
3191 | target_wait because they can be loaded from the target while | |
3192 | in target_wait. This makes remote debugging a bit more | |
3193 | efficient for those targets that provide critical registers | |
3194 | as part of their normal status mechanism. */ | |
3195 | ||
3196 | registers_changed (); | |
3197 | ecs->waiton_pid = -1; | |
3198 | ecs->wp = &(ecs->ws); | |
3199 | } | |
3200 | /* This is the old end of the while loop. Let everybody know we | |
3201 | want to wait for the inferior some more and get called again | |
3202 | soon. */ | |
3203 | ecs->wait_some_more = 1; | |
c906108c | 3204 | } |
11cf8741 JM |
3205 | |
3206 | /* Print why the inferior has stopped. We always print something when | |
3207 | the inferior exits, or receives a signal. The rest of the cases are | |
3208 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
3209 | there should be a call to this function from handle_inferior_event() | |
3210 | each time stop_stepping() is called.*/ | |
3211 | static void | |
3212 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
3213 | { | |
3214 | switch (stop_reason) | |
3215 | { | |
3216 | case STOP_UNKNOWN: | |
3217 | /* We don't deal with these cases from handle_inferior_event() | |
3218 | yet. */ | |
3219 | break; | |
3220 | case END_STEPPING_RANGE: | |
3221 | /* We are done with a step/next/si/ni command. */ | |
3222 | /* For now print nothing. */ | |
3223 | break; | |
3224 | case BREAKPOINT_HIT: | |
3225 | /* We found a breakpoint. */ | |
3226 | /* For now print nothing. */ | |
3227 | break; | |
3228 | case SIGNAL_EXITED: | |
3229 | /* The inferior was terminated by a signal. */ | |
3230 | annotate_signalled (); | |
3231 | printf_filtered ("\nProgram terminated with signal "); | |
3232 | annotate_signal_name (); | |
3233 | printf_filtered ("%s", target_signal_to_name (stop_info)); | |
3234 | annotate_signal_name_end (); | |
3235 | printf_filtered (", "); | |
3236 | annotate_signal_string (); | |
3237 | printf_filtered ("%s", target_signal_to_string (stop_info)); | |
3238 | annotate_signal_string_end (); | |
3239 | printf_filtered (".\n"); | |
3240 | ||
3241 | printf_filtered ("The program no longer exists.\n"); | |
3242 | gdb_flush (gdb_stdout); | |
3243 | break; | |
3244 | case EXITED: | |
3245 | /* The inferior program is finished. */ | |
3246 | annotate_exited (stop_info); | |
3247 | if (stop_info) | |
3248 | printf_filtered ("\nProgram exited with code 0%o.\n", | |
3249 | (unsigned int) stop_info); | |
3250 | else | |
3251 | printf_filtered ("\nProgram exited normally.\n"); | |
3252 | break; | |
3253 | case SIGNAL_RECEIVED: | |
3254 | /* Signal received. The signal table tells us to print about | |
3255 | it. */ | |
3256 | annotate_signal (); | |
3257 | printf_filtered ("\nProgram received signal "); | |
3258 | annotate_signal_name (); | |
3259 | printf_filtered ("%s", target_signal_to_name (stop_info)); | |
3260 | annotate_signal_name_end (); | |
3261 | printf_filtered (", "); | |
3262 | annotate_signal_string (); | |
3263 | printf_filtered ("%s", target_signal_to_string (stop_info)); | |
3264 | annotate_signal_string_end (); | |
3265 | printf_filtered (".\n"); | |
3266 | gdb_flush (gdb_stdout); | |
3267 | break; | |
3268 | default: | |
3269 | internal_error ("print_stop_reason: unrecognized enum value"); | |
3270 | break; | |
3271 | } | |
3272 | } | |
c906108c | 3273 | \f |
43ff13b4 | 3274 | |
c906108c SS |
3275 | /* Here to return control to GDB when the inferior stops for real. |
3276 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
3277 | ||
3278 | STOP_PRINT_FRAME nonzero means print the executing frame | |
3279 | (pc, function, args, file, line number and line text). | |
3280 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
3281 | attempting to insert breakpoints. */ | |
3282 | ||
3283 | void | |
96baa820 | 3284 | normal_stop (void) |
c906108c | 3285 | { |
c906108c SS |
3286 | /* As with the notification of thread events, we want to delay |
3287 | notifying the user that we've switched thread context until | |
3288 | the inferior actually stops. | |
3289 | ||
3290 | (Note that there's no point in saying anything if the inferior | |
3291 | has exited!) */ | |
7a292a7a SS |
3292 | if (may_switch_from_inferior_pid |
3293 | && (switched_from_inferior_pid != inferior_pid) | |
3294 | && target_has_execution) | |
c906108c SS |
3295 | { |
3296 | target_terminal_ours_for_output (); | |
3297 | printf_filtered ("[Switched to %s]\n", | |
3298 | target_pid_or_tid_to_str (inferior_pid)); | |
3299 | switched_from_inferior_pid = inferior_pid; | |
3300 | } | |
c906108c SS |
3301 | |
3302 | /* Make sure that the current_frame's pc is correct. This | |
3303 | is a correction for setting up the frame info before doing | |
3304 | DECR_PC_AFTER_BREAK */ | |
3305 | if (target_has_execution && get_current_frame ()) | |
3306 | (get_current_frame ())->pc = read_pc (); | |
3307 | ||
3308 | if (breakpoints_failed) | |
3309 | { | |
3310 | target_terminal_ours_for_output (); | |
3311 | print_sys_errmsg ("ptrace", breakpoints_failed); | |
3312 | printf_filtered ("Stopped; cannot insert breakpoints.\n\ | |
3313 | The same program may be running in another process.\n"); | |
3314 | } | |
3315 | ||
3316 | if (target_has_execution && breakpoints_inserted) | |
3317 | { | |
3318 | if (remove_breakpoints ()) | |
3319 | { | |
3320 | target_terminal_ours_for_output (); | |
3321 | printf_filtered ("Cannot remove breakpoints because "); | |
3322 | printf_filtered ("program is no longer writable.\n"); | |
3323 | printf_filtered ("It might be running in another process.\n"); | |
3324 | printf_filtered ("Further execution is probably impossible.\n"); | |
3325 | } | |
3326 | } | |
3327 | breakpoints_inserted = 0; | |
3328 | ||
3329 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3330 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3331 | ||
3332 | breakpoint_auto_delete (stop_bpstat); | |
3333 | ||
3334 | /* If an auto-display called a function and that got a signal, | |
3335 | delete that auto-display to avoid an infinite recursion. */ | |
3336 | ||
3337 | if (stopped_by_random_signal) | |
3338 | disable_current_display (); | |
3339 | ||
3340 | /* Don't print a message if in the middle of doing a "step n" | |
3341 | operation for n > 1 */ | |
3342 | if (step_multi && stop_step) | |
3343 | goto done; | |
3344 | ||
3345 | target_terminal_ours (); | |
3346 | ||
c906108c SS |
3347 | /* Look up the hook_stop and run it if it exists. */ |
3348 | ||
3349 | if (stop_command && stop_command->hook) | |
3350 | { | |
3351 | catch_errors (hook_stop_stub, stop_command->hook, | |
3352 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
3353 | } | |
3354 | ||
3355 | if (!target_has_stack) | |
3356 | { | |
3357 | ||
3358 | goto done; | |
3359 | } | |
3360 | ||
3361 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3362 | and current location is based on that. | |
3363 | Don't do this on return from a stack dummy routine, | |
3364 | or if the program has exited. */ | |
3365 | ||
3366 | if (!stop_stack_dummy) | |
3367 | { | |
3368 | select_frame (get_current_frame (), 0); | |
3369 | ||
3370 | /* Print current location without a level number, if | |
c5aa993b JM |
3371 | we have changed functions or hit a breakpoint. |
3372 | Print source line if we have one. | |
3373 | bpstat_print() contains the logic deciding in detail | |
3374 | what to print, based on the event(s) that just occurred. */ | |
c906108c SS |
3375 | |
3376 | if (stop_print_frame) | |
3377 | { | |
3378 | int bpstat_ret; | |
3379 | int source_flag; | |
917317f4 | 3380 | int do_frame_printing = 1; |
c906108c SS |
3381 | |
3382 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3383 | switch (bpstat_ret) |
3384 | { | |
3385 | case PRINT_UNKNOWN: | |
3386 | if (stop_step | |
3387 | && step_frame_address == FRAME_FP (get_current_frame ()) | |
3388 | && step_start_function == find_pc_function (stop_pc)) | |
3389 | source_flag = -1; /* finished step, just print source line */ | |
3390 | else | |
3391 | source_flag = 1; /* print location and source line */ | |
3392 | break; | |
3393 | case PRINT_SRC_AND_LOC: | |
3394 | source_flag = 1; /* print location and source line */ | |
3395 | break; | |
3396 | case PRINT_SRC_ONLY: | |
3397 | source_flag = -1; | |
3398 | break; | |
3399 | case PRINT_NOTHING: | |
3400 | do_frame_printing = 0; | |
3401 | break; | |
3402 | default: | |
3403 | internal_error ("Unknown value."); | |
3404 | } | |
c906108c SS |
3405 | |
3406 | /* The behavior of this routine with respect to the source | |
3407 | flag is: | |
3408 | -1: Print only source line | |
3409 | 0: Print only location | |
3410 | 1: Print location and source line */ | |
917317f4 JM |
3411 | if (do_frame_printing) |
3412 | show_and_print_stack_frame (selected_frame, -1, source_flag); | |
c906108c SS |
3413 | |
3414 | /* Display the auto-display expressions. */ | |
3415 | do_displays (); | |
3416 | } | |
3417 | } | |
3418 | ||
3419 | /* Save the function value return registers, if we care. | |
3420 | We might be about to restore their previous contents. */ | |
3421 | if (proceed_to_finish) | |
3422 | read_register_bytes (0, stop_registers, REGISTER_BYTES); | |
3423 | ||
3424 | if (stop_stack_dummy) | |
3425 | { | |
3426 | /* Pop the empty frame that contains the stack dummy. | |
3427 | POP_FRAME ends with a setting of the current frame, so we | |
c5aa993b | 3428 | can use that next. */ |
c906108c SS |
3429 | POP_FRAME; |
3430 | /* Set stop_pc to what it was before we called the function. | |
c5aa993b JM |
3431 | Can't rely on restore_inferior_status because that only gets |
3432 | called if we don't stop in the called function. */ | |
c906108c SS |
3433 | stop_pc = read_pc (); |
3434 | select_frame (get_current_frame (), 0); | |
3435 | } | |
3436 | ||
3437 | ||
3438 | TUIDO (((TuiOpaqueFuncPtr) tui_vCheckDataValues, selected_frame)); | |
3439 | ||
3440 | done: | |
3441 | annotate_stopped (); | |
3442 | } | |
3443 | ||
3444 | static int | |
96baa820 | 3445 | hook_stop_stub (void *cmd) |
c906108c SS |
3446 | { |
3447 | execute_user_command ((struct cmd_list_element *) cmd, 0); | |
3448 | return (0); | |
3449 | } | |
3450 | \f | |
c5aa993b | 3451 | int |
96baa820 | 3452 | signal_stop_state (int signo) |
c906108c SS |
3453 | { |
3454 | return signal_stop[signo]; | |
3455 | } | |
3456 | ||
c5aa993b | 3457 | int |
96baa820 | 3458 | signal_print_state (int signo) |
c906108c SS |
3459 | { |
3460 | return signal_print[signo]; | |
3461 | } | |
3462 | ||
c5aa993b | 3463 | int |
96baa820 | 3464 | signal_pass_state (int signo) |
c906108c SS |
3465 | { |
3466 | return signal_program[signo]; | |
3467 | } | |
3468 | ||
d4f3574e SS |
3469 | int signal_stop_update (signo, state) |
3470 | int signo; | |
3471 | int state; | |
3472 | { | |
3473 | int ret = signal_stop[signo]; | |
3474 | signal_stop[signo] = state; | |
3475 | return ret; | |
3476 | } | |
3477 | ||
3478 | int signal_print_update (signo, state) | |
3479 | int signo; | |
3480 | int state; | |
3481 | { | |
3482 | int ret = signal_print[signo]; | |
3483 | signal_print[signo] = state; | |
3484 | return ret; | |
3485 | } | |
3486 | ||
3487 | int signal_pass_update (signo, state) | |
3488 | int signo; | |
3489 | int state; | |
3490 | { | |
3491 | int ret = signal_program[signo]; | |
3492 | signal_program[signo] = state; | |
3493 | return ret; | |
3494 | } | |
3495 | ||
c906108c | 3496 | static void |
96baa820 | 3497 | sig_print_header (void) |
c906108c SS |
3498 | { |
3499 | printf_filtered ("\ | |
3500 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3501 | } | |
3502 | ||
3503 | static void | |
96baa820 | 3504 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3505 | { |
3506 | char *name = target_signal_to_name (oursig); | |
3507 | int name_padding = 13 - strlen (name); | |
96baa820 | 3508 | |
c906108c SS |
3509 | if (name_padding <= 0) |
3510 | name_padding = 0; | |
3511 | ||
3512 | printf_filtered ("%s", name); | |
3513 | printf_filtered ("%*.*s ", name_padding, name_padding, | |
3514 | " "); | |
3515 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); | |
3516 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3517 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3518 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3519 | } | |
3520 | ||
3521 | /* Specify how various signals in the inferior should be handled. */ | |
3522 | ||
3523 | static void | |
96baa820 | 3524 | handle_command (char *args, int from_tty) |
c906108c SS |
3525 | { |
3526 | char **argv; | |
3527 | int digits, wordlen; | |
3528 | int sigfirst, signum, siglast; | |
3529 | enum target_signal oursig; | |
3530 | int allsigs; | |
3531 | int nsigs; | |
3532 | unsigned char *sigs; | |
3533 | struct cleanup *old_chain; | |
3534 | ||
3535 | if (args == NULL) | |
3536 | { | |
3537 | error_no_arg ("signal to handle"); | |
3538 | } | |
3539 | ||
3540 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3541 | ||
3542 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3543 | sigs = (unsigned char *) alloca (nsigs); | |
3544 | memset (sigs, 0, nsigs); | |
3545 | ||
3546 | /* Break the command line up into args. */ | |
3547 | ||
3548 | argv = buildargv (args); | |
3549 | if (argv == NULL) | |
3550 | { | |
3551 | nomem (0); | |
3552 | } | |
7a292a7a | 3553 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3554 | |
3555 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3556 | actions. Signal numbers and signal names may be interspersed with | |
3557 | actions, with the actions being performed for all signals cumulatively | |
3558 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3559 | ||
3560 | while (*argv != NULL) | |
3561 | { | |
3562 | wordlen = strlen (*argv); | |
3563 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3564 | {; | |
3565 | } | |
3566 | allsigs = 0; | |
3567 | sigfirst = siglast = -1; | |
3568 | ||
3569 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3570 | { | |
3571 | /* Apply action to all signals except those used by the | |
3572 | debugger. Silently skip those. */ | |
3573 | allsigs = 1; | |
3574 | sigfirst = 0; | |
3575 | siglast = nsigs - 1; | |
3576 | } | |
3577 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3578 | { | |
3579 | SET_SIGS (nsigs, sigs, signal_stop); | |
3580 | SET_SIGS (nsigs, sigs, signal_print); | |
3581 | } | |
3582 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3583 | { | |
3584 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3585 | } | |
3586 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3587 | { | |
3588 | SET_SIGS (nsigs, sigs, signal_print); | |
3589 | } | |
3590 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3591 | { | |
3592 | SET_SIGS (nsigs, sigs, signal_program); | |
3593 | } | |
3594 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3595 | { | |
3596 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3597 | } | |
3598 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3599 | { | |
3600 | SET_SIGS (nsigs, sigs, signal_program); | |
3601 | } | |
3602 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3603 | { | |
3604 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3605 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3606 | } | |
3607 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3608 | { | |
3609 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3610 | } | |
3611 | else if (digits > 0) | |
3612 | { | |
3613 | /* It is numeric. The numeric signal refers to our own | |
3614 | internal signal numbering from target.h, not to host/target | |
3615 | signal number. This is a feature; users really should be | |
3616 | using symbolic names anyway, and the common ones like | |
3617 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3618 | ||
3619 | sigfirst = siglast = (int) | |
3620 | target_signal_from_command (atoi (*argv)); | |
3621 | if ((*argv)[digits] == '-') | |
3622 | { | |
3623 | siglast = (int) | |
3624 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3625 | } | |
3626 | if (sigfirst > siglast) | |
3627 | { | |
3628 | /* Bet he didn't figure we'd think of this case... */ | |
3629 | signum = sigfirst; | |
3630 | sigfirst = siglast; | |
3631 | siglast = signum; | |
3632 | } | |
3633 | } | |
3634 | else | |
3635 | { | |
3636 | oursig = target_signal_from_name (*argv); | |
3637 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3638 | { | |
3639 | sigfirst = siglast = (int) oursig; | |
3640 | } | |
3641 | else | |
3642 | { | |
3643 | /* Not a number and not a recognized flag word => complain. */ | |
3644 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3645 | } | |
3646 | } | |
3647 | ||
3648 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3649 | which signals to apply actions to. */ |
c906108c SS |
3650 | |
3651 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3652 | { | |
3653 | switch ((enum target_signal) signum) | |
3654 | { | |
3655 | case TARGET_SIGNAL_TRAP: | |
3656 | case TARGET_SIGNAL_INT: | |
3657 | if (!allsigs && !sigs[signum]) | |
3658 | { | |
3659 | if (query ("%s is used by the debugger.\n\ | |
3660 | Are you sure you want to change it? ", | |
3661 | target_signal_to_name | |
3662 | ((enum target_signal) signum))) | |
3663 | { | |
3664 | sigs[signum] = 1; | |
3665 | } | |
3666 | else | |
3667 | { | |
3668 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3669 | gdb_flush (gdb_stdout); | |
3670 | } | |
3671 | } | |
3672 | break; | |
3673 | case TARGET_SIGNAL_0: | |
3674 | case TARGET_SIGNAL_DEFAULT: | |
3675 | case TARGET_SIGNAL_UNKNOWN: | |
3676 | /* Make sure that "all" doesn't print these. */ | |
3677 | break; | |
3678 | default: | |
3679 | sigs[signum] = 1; | |
3680 | break; | |
3681 | } | |
3682 | } | |
3683 | ||
3684 | argv++; | |
3685 | } | |
3686 | ||
3687 | target_notice_signals (inferior_pid); | |
3688 | ||
3689 | if (from_tty) | |
3690 | { | |
3691 | /* Show the results. */ | |
3692 | sig_print_header (); | |
3693 | for (signum = 0; signum < nsigs; signum++) | |
3694 | { | |
3695 | if (sigs[signum]) | |
3696 | { | |
3697 | sig_print_info (signum); | |
3698 | } | |
3699 | } | |
3700 | } | |
3701 | ||
3702 | do_cleanups (old_chain); | |
3703 | } | |
3704 | ||
3705 | static void | |
96baa820 | 3706 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3707 | { |
3708 | char **argv; | |
3709 | struct cleanup *old_chain; | |
3710 | ||
3711 | /* Break the command line up into args. */ | |
3712 | ||
3713 | argv = buildargv (args); | |
3714 | if (argv == NULL) | |
3715 | { | |
3716 | nomem (0); | |
3717 | } | |
7a292a7a | 3718 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3719 | if (argv[1] != (char *) NULL) |
3720 | { | |
3721 | char *argBuf; | |
3722 | int bufLen; | |
3723 | ||
3724 | bufLen = strlen (argv[0]) + 20; | |
3725 | argBuf = (char *) xmalloc (bufLen); | |
3726 | if (argBuf) | |
3727 | { | |
3728 | int validFlag = 1; | |
3729 | enum target_signal oursig; | |
3730 | ||
3731 | oursig = target_signal_from_name (argv[0]); | |
3732 | memset (argBuf, 0, bufLen); | |
3733 | if (strcmp (argv[1], "Q") == 0) | |
3734 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3735 | else | |
3736 | { | |
3737 | if (strcmp (argv[1], "s") == 0) | |
3738 | { | |
3739 | if (!signal_stop[oursig]) | |
3740 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3741 | else | |
3742 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3743 | } | |
3744 | else if (strcmp (argv[1], "i") == 0) | |
3745 | { | |
3746 | if (!signal_program[oursig]) | |
3747 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3748 | else | |
3749 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3750 | } | |
3751 | else if (strcmp (argv[1], "r") == 0) | |
3752 | { | |
3753 | if (!signal_print[oursig]) | |
3754 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3755 | else | |
3756 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3757 | } | |
3758 | else | |
3759 | validFlag = 0; | |
3760 | } | |
3761 | if (validFlag) | |
3762 | handle_command (argBuf, from_tty); | |
3763 | else | |
3764 | printf_filtered ("Invalid signal handling flag.\n"); | |
3765 | if (argBuf) | |
3766 | free (argBuf); | |
3767 | } | |
3768 | } | |
3769 | do_cleanups (old_chain); | |
3770 | } | |
3771 | ||
3772 | /* Print current contents of the tables set by the handle command. | |
3773 | It is possible we should just be printing signals actually used | |
3774 | by the current target (but for things to work right when switching | |
3775 | targets, all signals should be in the signal tables). */ | |
3776 | ||
3777 | static void | |
96baa820 | 3778 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3779 | { |
3780 | enum target_signal oursig; | |
3781 | sig_print_header (); | |
3782 | ||
3783 | if (signum_exp) | |
3784 | { | |
3785 | /* First see if this is a symbol name. */ | |
3786 | oursig = target_signal_from_name (signum_exp); | |
3787 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3788 | { | |
3789 | /* No, try numeric. */ | |
3790 | oursig = | |
3791 | target_signal_from_command (parse_and_eval_address (signum_exp)); | |
3792 | } | |
3793 | sig_print_info (oursig); | |
3794 | return; | |
3795 | } | |
3796 | ||
3797 | printf_filtered ("\n"); | |
3798 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3799 | for (oursig = TARGET_SIGNAL_FIRST; | |
3800 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3801 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3802 | { | |
3803 | QUIT; | |
3804 | ||
3805 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
3806 | && oursig != TARGET_SIGNAL_DEFAULT | |
3807 | && oursig != TARGET_SIGNAL_0) | |
3808 | sig_print_info (oursig); | |
3809 | } | |
3810 | ||
3811 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3812 | } | |
3813 | \f | |
7a292a7a SS |
3814 | struct inferior_status |
3815 | { | |
3816 | enum target_signal stop_signal; | |
3817 | CORE_ADDR stop_pc; | |
3818 | bpstat stop_bpstat; | |
3819 | int stop_step; | |
3820 | int stop_stack_dummy; | |
3821 | int stopped_by_random_signal; | |
3822 | int trap_expected; | |
3823 | CORE_ADDR step_range_start; | |
3824 | CORE_ADDR step_range_end; | |
3825 | CORE_ADDR step_frame_address; | |
3826 | int step_over_calls; | |
3827 | CORE_ADDR step_resume_break_address; | |
3828 | int stop_after_trap; | |
3829 | int stop_soon_quietly; | |
3830 | CORE_ADDR selected_frame_address; | |
3831 | char *stop_registers; | |
3832 | ||
3833 | /* These are here because if call_function_by_hand has written some | |
3834 | registers and then decides to call error(), we better not have changed | |
3835 | any registers. */ | |
3836 | char *registers; | |
3837 | ||
3838 | int selected_level; | |
3839 | int breakpoint_proceeded; | |
3840 | int restore_stack_info; | |
3841 | int proceed_to_finish; | |
3842 | }; | |
3843 | ||
7a292a7a | 3844 | static struct inferior_status * |
96baa820 | 3845 | xmalloc_inferior_status (void) |
7a292a7a SS |
3846 | { |
3847 | struct inferior_status *inf_status; | |
3848 | inf_status = xmalloc (sizeof (struct inferior_status)); | |
3849 | inf_status->stop_registers = xmalloc (REGISTER_BYTES); | |
3850 | inf_status->registers = xmalloc (REGISTER_BYTES); | |
3851 | return inf_status; | |
3852 | } | |
3853 | ||
7a292a7a | 3854 | static void |
96baa820 | 3855 | free_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3856 | { |
3857 | free (inf_status->registers); | |
3858 | free (inf_status->stop_registers); | |
3859 | free (inf_status); | |
3860 | } | |
3861 | ||
3862 | void | |
96baa820 JM |
3863 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3864 | LONGEST val) | |
7a292a7a | 3865 | { |
c5aa993b | 3866 | int size = REGISTER_RAW_SIZE (regno); |
7a292a7a SS |
3867 | void *buf = alloca (size); |
3868 | store_signed_integer (buf, size, val); | |
3869 | memcpy (&inf_status->registers[REGISTER_BYTE (regno)], buf, size); | |
3870 | } | |
3871 | ||
c906108c SS |
3872 | /* Save all of the information associated with the inferior<==>gdb |
3873 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
3874 | (defined in inferior.h). */ | |
3875 | ||
7a292a7a | 3876 | struct inferior_status * |
96baa820 | 3877 | save_inferior_status (int restore_stack_info) |
c906108c | 3878 | { |
7a292a7a SS |
3879 | struct inferior_status *inf_status = xmalloc_inferior_status (); |
3880 | ||
c906108c SS |
3881 | inf_status->stop_signal = stop_signal; |
3882 | inf_status->stop_pc = stop_pc; | |
3883 | inf_status->stop_step = stop_step; | |
3884 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
3885 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
3886 | inf_status->trap_expected = trap_expected; | |
3887 | inf_status->step_range_start = step_range_start; | |
3888 | inf_status->step_range_end = step_range_end; | |
3889 | inf_status->step_frame_address = step_frame_address; | |
3890 | inf_status->step_over_calls = step_over_calls; | |
3891 | inf_status->stop_after_trap = stop_after_trap; | |
3892 | inf_status->stop_soon_quietly = stop_soon_quietly; | |
3893 | /* Save original bpstat chain here; replace it with copy of chain. | |
3894 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
3895 | hand them back the original chain when restore_inferior_status is |
3896 | called. */ | |
c906108c SS |
3897 | inf_status->stop_bpstat = stop_bpstat; |
3898 | stop_bpstat = bpstat_copy (stop_bpstat); | |
3899 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
3900 | inf_status->restore_stack_info = restore_stack_info; | |
3901 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 3902 | |
c906108c SS |
3903 | memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES); |
3904 | ||
3905 | read_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
3906 | ||
3907 | record_selected_frame (&(inf_status->selected_frame_address), | |
3908 | &(inf_status->selected_level)); | |
7a292a7a | 3909 | return inf_status; |
c906108c SS |
3910 | } |
3911 | ||
3912 | struct restore_selected_frame_args | |
3913 | { | |
3914 | CORE_ADDR frame_address; | |
3915 | int level; | |
3916 | }; | |
3917 | ||
c906108c | 3918 | static int |
96baa820 | 3919 | restore_selected_frame (void *args) |
c906108c SS |
3920 | { |
3921 | struct restore_selected_frame_args *fr = | |
3922 | (struct restore_selected_frame_args *) args; | |
3923 | struct frame_info *frame; | |
3924 | int level = fr->level; | |
3925 | ||
3926 | frame = find_relative_frame (get_current_frame (), &level); | |
3927 | ||
3928 | /* If inf_status->selected_frame_address is NULL, there was no | |
3929 | previously selected frame. */ | |
3930 | if (frame == NULL || | |
3931 | /* FRAME_FP (frame) != fr->frame_address || */ | |
3932 | /* elz: deleted this check as a quick fix to the problem that | |
c5aa993b JM |
3933 | for function called by hand gdb creates no internal frame |
3934 | structure and the real stack and gdb's idea of stack are | |
3935 | different if nested calls by hands are made. | |
c906108c | 3936 | |
c5aa993b | 3937 | mvs: this worries me. */ |
c906108c SS |
3938 | level != 0) |
3939 | { | |
3940 | warning ("Unable to restore previously selected frame.\n"); | |
3941 | return 0; | |
3942 | } | |
3943 | ||
3944 | select_frame (frame, fr->level); | |
3945 | ||
3946 | return (1); | |
3947 | } | |
3948 | ||
3949 | void | |
96baa820 | 3950 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
3951 | { |
3952 | stop_signal = inf_status->stop_signal; | |
3953 | stop_pc = inf_status->stop_pc; | |
3954 | stop_step = inf_status->stop_step; | |
3955 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
3956 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
3957 | trap_expected = inf_status->trap_expected; | |
3958 | step_range_start = inf_status->step_range_start; | |
3959 | step_range_end = inf_status->step_range_end; | |
3960 | step_frame_address = inf_status->step_frame_address; | |
3961 | step_over_calls = inf_status->step_over_calls; | |
3962 | stop_after_trap = inf_status->stop_after_trap; | |
3963 | stop_soon_quietly = inf_status->stop_soon_quietly; | |
3964 | bpstat_clear (&stop_bpstat); | |
3965 | stop_bpstat = inf_status->stop_bpstat; | |
3966 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
3967 | proceed_to_finish = inf_status->proceed_to_finish; | |
3968 | ||
7a292a7a | 3969 | /* FIXME: Is the restore of stop_registers always needed */ |
c906108c SS |
3970 | memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES); |
3971 | ||
3972 | /* The inferior can be gone if the user types "print exit(0)" | |
3973 | (and perhaps other times). */ | |
3974 | if (target_has_execution) | |
3975 | write_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
3976 | ||
c906108c SS |
3977 | /* FIXME: If we are being called after stopping in a function which |
3978 | is called from gdb, we should not be trying to restore the | |
3979 | selected frame; it just prints a spurious error message (The | |
3980 | message is useful, however, in detecting bugs in gdb (like if gdb | |
3981 | clobbers the stack)). In fact, should we be restoring the | |
3982 | inferior status at all in that case? . */ | |
3983 | ||
3984 | if (target_has_stack && inf_status->restore_stack_info) | |
3985 | { | |
3986 | struct restore_selected_frame_args fr; | |
3987 | fr.level = inf_status->selected_level; | |
3988 | fr.frame_address = inf_status->selected_frame_address; | |
3989 | /* The point of catch_errors is that if the stack is clobbered, | |
c5aa993b JM |
3990 | walking the stack might encounter a garbage pointer and error() |
3991 | trying to dereference it. */ | |
c906108c SS |
3992 | if (catch_errors (restore_selected_frame, &fr, |
3993 | "Unable to restore previously selected frame:\n", | |
3994 | RETURN_MASK_ERROR) == 0) | |
3995 | /* Error in restoring the selected frame. Select the innermost | |
3996 | frame. */ | |
3997 | ||
3998 | ||
3999 | select_frame (get_current_frame (), 0); | |
4000 | ||
4001 | } | |
c906108c | 4002 | |
7a292a7a SS |
4003 | free_inferior_status (inf_status); |
4004 | } | |
c906108c SS |
4005 | |
4006 | void | |
96baa820 | 4007 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
4008 | { |
4009 | /* See save_inferior_status for info on stop_bpstat. */ | |
4010 | bpstat_clear (&inf_status->stop_bpstat); | |
4011 | free_inferior_status (inf_status); | |
4012 | } | |
4013 | ||
4014 | static void | |
96baa820 JM |
4015 | set_follow_fork_mode_command (char *arg, int from_tty, |
4016 | struct cmd_list_element *c) | |
c906108c SS |
4017 | { |
4018 | if (!STREQ (arg, "parent") && | |
4019 | !STREQ (arg, "child") && | |
4020 | !STREQ (arg, "both") && | |
4021 | !STREQ (arg, "ask")) | |
4022 | error ("follow-fork-mode must be one of \"parent\", \"child\", \"both\" or \"ask\"."); | |
4023 | ||
4024 | if (follow_fork_mode_string != NULL) | |
4025 | free (follow_fork_mode_string); | |
4026 | follow_fork_mode_string = savestring (arg, strlen (arg)); | |
4027 | } | |
c5aa993b | 4028 | \f |
7a292a7a | 4029 | static void |
96baa820 | 4030 | build_infrun (void) |
7a292a7a SS |
4031 | { |
4032 | stop_registers = xmalloc (REGISTER_BYTES); | |
4033 | } | |
c906108c | 4034 | |
c906108c | 4035 | void |
96baa820 | 4036 | _initialize_infrun (void) |
c906108c SS |
4037 | { |
4038 | register int i; | |
4039 | register int numsigs; | |
4040 | struct cmd_list_element *c; | |
4041 | ||
7a292a7a SS |
4042 | build_infrun (); |
4043 | ||
0f71a2f6 JM |
4044 | register_gdbarch_swap (&stop_registers, sizeof (stop_registers), NULL); |
4045 | register_gdbarch_swap (NULL, 0, build_infrun); | |
4046 | ||
c906108c SS |
4047 | add_info ("signals", signals_info, |
4048 | "What debugger does when program gets various signals.\n\ | |
4049 | Specify a signal as argument to print info on that signal only."); | |
4050 | add_info_alias ("handle", "signals", 0); | |
4051 | ||
4052 | add_com ("handle", class_run, handle_command, | |
4053 | concat ("Specify how to handle a signal.\n\ | |
4054 | Args are signals and actions to apply to those signals.\n\ | |
4055 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
4056 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
4057 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
4058 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
4059 | used by the debugger, typically SIGTRAP and SIGINT.\n", | |
4060 | "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
4061 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ | |
4062 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
4063 | Print means print a message if this signal happens.\n\ | |
4064 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
4065 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
4066 | Pass and Stop may be combined.", NULL)); | |
4067 | if (xdb_commands) | |
4068 | { | |
4069 | add_com ("lz", class_info, signals_info, | |
4070 | "What debugger does when program gets various signals.\n\ | |
4071 | Specify a signal as argument to print info on that signal only."); | |
4072 | add_com ("z", class_run, xdb_handle_command, | |
4073 | concat ("Specify how to handle a signal.\n\ | |
4074 | Args are signals and actions to apply to those signals.\n\ | |
4075 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
4076 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
4077 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
4078 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
4079 | used by the debugger, typically SIGTRAP and SIGINT.\n", | |
4080 | "Recognized actions include \"s\" (toggles between stop and nostop), \n\ | |
4081 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ | |
4082 | nopass), \"Q\" (noprint)\n\ | |
4083 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
4084 | Print means print a message if this signal happens.\n\ | |
4085 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
4086 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
4087 | Pass and Stop may be combined.", NULL)); | |
4088 | } | |
4089 | ||
4090 | if (!dbx_commands) | |
4091 | stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command, | |
4092 | "There is no `stop' command, but you can set a hook on `stop'.\n\ | |
4093 | This allows you to set a list of commands to be run each time execution\n\ | |
4094 | of the program stops.", &cmdlist); | |
4095 | ||
4096 | numsigs = (int) TARGET_SIGNAL_LAST; | |
4097 | signal_stop = (unsigned char *) | |
4098 | xmalloc (sizeof (signal_stop[0]) * numsigs); | |
4099 | signal_print = (unsigned char *) | |
4100 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
4101 | signal_program = (unsigned char *) | |
4102 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
4103 | for (i = 0; i < numsigs; i++) | |
4104 | { | |
4105 | signal_stop[i] = 1; | |
4106 | signal_print[i] = 1; | |
4107 | signal_program[i] = 1; | |
4108 | } | |
4109 | ||
4110 | /* Signals caused by debugger's own actions | |
4111 | should not be given to the program afterwards. */ | |
4112 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
4113 | signal_program[TARGET_SIGNAL_INT] = 0; | |
4114 | ||
4115 | /* Signals that are not errors should not normally enter the debugger. */ | |
4116 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
4117 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
4118 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
4119 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
4120 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
4121 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
4122 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
4123 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
4124 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
4125 | signal_print[TARGET_SIGNAL_IO] = 0; | |
4126 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
4127 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
4128 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
4129 | signal_print[TARGET_SIGNAL_URG] = 0; | |
4130 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
4131 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
4132 | ||
cd0fc7c3 SS |
4133 | /* These signals are used internally by user-level thread |
4134 | implementations. (See signal(5) on Solaris.) Like the above | |
4135 | signals, a healthy program receives and handles them as part of | |
4136 | its normal operation. */ | |
4137 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
4138 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
4139 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
4140 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
4141 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
4142 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
4143 | ||
c906108c SS |
4144 | #ifdef SOLIB_ADD |
4145 | add_show_from_set | |
4146 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, | |
4147 | (char *) &stop_on_solib_events, | |
4148 | "Set stopping for shared library events.\n\ | |
4149 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
4150 | notifies gdb of shared library events. The most common event of interest\n\ | |
4151 | to the user would be loading/unloading of a new library.\n", | |
4152 | &setlist), | |
4153 | &showlist); | |
4154 | #endif | |
4155 | ||
4156 | c = add_set_enum_cmd ("follow-fork-mode", | |
4157 | class_run, | |
4158 | follow_fork_mode_kind_names, | |
4159 | (char *) &follow_fork_mode_string, | |
4160 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 | |
4161 | kernel problem. It's also not terribly useful without a GUI to | |
4162 | help the user drive two debuggers. So for now, I'm disabling | |
4163 | the "both" option. */ | |
c5aa993b JM |
4164 | /* "Set debugger response to a program call of fork \ |
4165 | or vfork.\n\ | |
4166 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
4167 | parent - the original process is debugged after a fork\n\ | |
4168 | child - the new process is debugged after a fork\n\ | |
4169 | both - both the parent and child are debugged after a fork\n\ | |
4170 | ask - the debugger will ask for one of the above choices\n\ | |
4171 | For \"both\", another copy of the debugger will be started to follow\n\ | |
4172 | the new child process. The original debugger will continue to follow\n\ | |
4173 | the original parent process. To distinguish their prompts, the\n\ | |
4174 | debugger copy's prompt will be changed.\n\ | |
4175 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
4176 | By default, the debugger will follow the parent process.", | |
4177 | */ | |
c906108c SS |
4178 | "Set debugger response to a program call of fork \ |
4179 | or vfork.\n\ | |
4180 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
4181 | parent - the original process is debugged after a fork\n\ | |
4182 | child - the new process is debugged after a fork\n\ | |
4183 | ask - the debugger will ask for one of the above choices\n\ | |
4184 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
4185 | By default, the debugger will follow the parent process.", | |
4186 | &setlist); | |
c5aa993b | 4187 | /* c->function.sfunc = ; */ |
c906108c SS |
4188 | add_show_from_set (c, &showlist); |
4189 | ||
4190 | set_follow_fork_mode_command ("parent", 0, NULL); | |
4191 | ||
4192 | c = add_set_enum_cmd ("scheduler-locking", class_run, | |
4193 | scheduler_enums, /* array of string names */ | |
4194 | (char *) &scheduler_mode, /* current mode */ | |
4195 | "Set mode for locking scheduler during execution.\n\ | |
4196 | off == no locking (threads may preempt at any time)\n\ | |
4197 | on == full locking (no thread except the current thread may run)\n\ | |
4198 | step == scheduler locked during every single-step operation.\n\ | |
4199 | In this mode, no other thread may run during a step command.\n\ | |
4200 | Other threads may run while stepping over a function call ('next').", | |
4201 | &setlist); | |
4202 | ||
4203 | c->function.sfunc = set_schedlock_func; /* traps on target vector */ | |
4204 | add_show_from_set (c, &showlist); | |
4205 | } |