Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Target-struct-independent code to start (run) and stop an inferior process. |
b6ba6518 KB |
2 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
3 | 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. | |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
c906108c | 11 | |
c5aa993b JM |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
c906108c | 16 | |
c5aa993b JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | #include "defs.h" | |
23 | #include "gdb_string.h" | |
24 | #include <ctype.h> | |
25 | #include "symtab.h" | |
26 | #include "frame.h" | |
27 | #include "inferior.h" | |
28 | #include "breakpoint.h" | |
03f2053f | 29 | #include "gdb_wait.h" |
c906108c SS |
30 | #include "gdbcore.h" |
31 | #include "gdbcmd.h" | |
210661e7 | 32 | #include "cli/cli-script.h" |
c906108c SS |
33 | #include "target.h" |
34 | #include "gdbthread.h" | |
35 | #include "annotate.h" | |
1adeb98a | 36 | #include "symfile.h" |
7a292a7a | 37 | #include "top.h" |
c906108c | 38 | #include <signal.h> |
2acceee2 | 39 | #include "inf-loop.h" |
4e052eda | 40 | #include "regcache.h" |
fd0407d6 | 41 | #include "value.h" |
c906108c SS |
42 | |
43 | /* Prototypes for local functions */ | |
44 | ||
96baa820 | 45 | static void signals_info (char *, int); |
c906108c | 46 | |
96baa820 | 47 | static void handle_command (char *, int); |
c906108c | 48 | |
96baa820 | 49 | static void sig_print_info (enum target_signal); |
c906108c | 50 | |
96baa820 | 51 | static void sig_print_header (void); |
c906108c | 52 | |
74b7792f | 53 | static void resume_cleanups (void *); |
c906108c | 54 | |
96baa820 | 55 | static int hook_stop_stub (void *); |
c906108c | 56 | |
96baa820 | 57 | static void delete_breakpoint_current_contents (void *); |
c906108c | 58 | |
96baa820 JM |
59 | static void set_follow_fork_mode_command (char *arg, int from_tty, |
60 | struct cmd_list_element * c); | |
7a292a7a | 61 | |
96baa820 JM |
62 | static struct inferior_status *xmalloc_inferior_status (void); |
63 | ||
64 | static void free_inferior_status (struct inferior_status *); | |
65 | ||
66 | static int restore_selected_frame (void *); | |
67 | ||
68 | static void build_infrun (void); | |
69 | ||
70 | static void follow_inferior_fork (int parent_pid, int child_pid, | |
71 | int has_forked, int has_vforked); | |
72 | ||
73 | static void follow_fork (int parent_pid, int child_pid); | |
74 | ||
75 | static void follow_vfork (int parent_pid, int child_pid); | |
76 | ||
77 | static void set_schedlock_func (char *args, int from_tty, | |
78 | struct cmd_list_element * c); | |
79 | ||
96baa820 JM |
80 | struct execution_control_state; |
81 | ||
82 | static int currently_stepping (struct execution_control_state *ecs); | |
83 | ||
84 | static void xdb_handle_command (char *args, int from_tty); | |
85 | ||
86 | void _initialize_infrun (void); | |
43ff13b4 | 87 | |
c906108c SS |
88 | int inferior_ignoring_startup_exec_events = 0; |
89 | int inferior_ignoring_leading_exec_events = 0; | |
90 | ||
5fbbeb29 CF |
91 | /* When set, stop the 'step' command if we enter a function which has |
92 | no line number information. The normal behavior is that we step | |
93 | over such function. */ | |
94 | int step_stop_if_no_debug = 0; | |
95 | ||
43ff13b4 | 96 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 97 | |
43ff13b4 JM |
98 | int sync_execution = 0; |
99 | ||
c906108c SS |
100 | /* wait_for_inferior and normal_stop use this to notify the user |
101 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
102 | running in. */ |
103 | ||
39f77062 | 104 | static ptid_t previous_inferior_ptid; |
7a292a7a SS |
105 | |
106 | /* This is true for configurations that may follow through execl() and | |
107 | similar functions. At present this is only true for HP-UX native. */ | |
108 | ||
109 | #ifndef MAY_FOLLOW_EXEC | |
110 | #define MAY_FOLLOW_EXEC (0) | |
c906108c SS |
111 | #endif |
112 | ||
7a292a7a SS |
113 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
114 | ||
c906108c SS |
115 | /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the |
116 | program. It needs to examine the jmp_buf argument and extract the PC | |
117 | from it. The return value is non-zero on success, zero otherwise. */ | |
118 | ||
119 | #ifndef GET_LONGJMP_TARGET | |
120 | #define GET_LONGJMP_TARGET(PC_ADDR) 0 | |
121 | #endif | |
122 | ||
123 | ||
c906108c SS |
124 | /* Dynamic function trampolines are similar to solib trampolines in that they |
125 | are between the caller and the callee. The difference is that when you | |
126 | enter a dynamic trampoline, you can't determine the callee's address. Some | |
127 | (usually complex) code needs to run in the dynamic trampoline to figure out | |
128 | the callee's address. This macro is usually called twice. First, when we | |
129 | enter the trampoline (looks like a normal function call at that point). It | |
130 | should return the PC of a point within the trampoline where the callee's | |
131 | address is known. Second, when we hit the breakpoint, this routine returns | |
132 | the callee's address. At that point, things proceed as per a step resume | |
133 | breakpoint. */ | |
134 | ||
135 | #ifndef DYNAMIC_TRAMPOLINE_NEXTPC | |
136 | #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0 | |
137 | #endif | |
138 | ||
d4f3574e SS |
139 | /* If the program uses ELF-style shared libraries, then calls to |
140 | functions in shared libraries go through stubs, which live in a | |
141 | table called the PLT (Procedure Linkage Table). The first time the | |
142 | function is called, the stub sends control to the dynamic linker, | |
143 | which looks up the function's real address, patches the stub so | |
144 | that future calls will go directly to the function, and then passes | |
145 | control to the function. | |
146 | ||
147 | If we are stepping at the source level, we don't want to see any of | |
148 | this --- we just want to skip over the stub and the dynamic linker. | |
149 | The simple approach is to single-step until control leaves the | |
150 | dynamic linker. | |
151 | ||
152 | However, on some systems (e.g., Red Hat Linux 5.2) the dynamic | |
153 | linker calls functions in the shared C library, so you can't tell | |
154 | from the PC alone whether the dynamic linker is still running. In | |
155 | this case, we use a step-resume breakpoint to get us past the | |
156 | dynamic linker, as if we were using "next" to step over a function | |
157 | call. | |
158 | ||
159 | IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic | |
160 | linker code or not. Normally, this means we single-step. However, | |
161 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
162 | address where we can place a step-resume breakpoint to get past the | |
163 | linker's symbol resolution function. | |
164 | ||
165 | IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a | |
166 | pretty portable way, by comparing the PC against the address ranges | |
167 | of the dynamic linker's sections. | |
168 | ||
169 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
170 | it depends on internal details of the dynamic linker. It's usually | |
171 | not too hard to figure out where to put a breakpoint, but it | |
172 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
173 | sanity checking. If it can't figure things out, returning zero and | |
174 | getting the (possibly confusing) stepping behavior is better than | |
175 | signalling an error, which will obscure the change in the | |
176 | inferior's state. */ | |
c906108c SS |
177 | |
178 | #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
179 | #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 | |
180 | #endif | |
181 | ||
d4f3574e SS |
182 | #ifndef SKIP_SOLIB_RESOLVER |
183 | #define SKIP_SOLIB_RESOLVER(pc) 0 | |
184 | #endif | |
185 | ||
c906108c SS |
186 | /* For SVR4 shared libraries, each call goes through a small piece of |
187 | trampoline code in the ".plt" section. IN_SOLIB_CALL_TRAMPOLINE evaluates | |
188 | to nonzero if we are current stopped in one of these. */ | |
189 | ||
190 | #ifndef IN_SOLIB_CALL_TRAMPOLINE | |
191 | #define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0 | |
192 | #endif | |
193 | ||
194 | /* In some shared library schemes, the return path from a shared library | |
195 | call may need to go through a trampoline too. */ | |
196 | ||
197 | #ifndef IN_SOLIB_RETURN_TRAMPOLINE | |
198 | #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0 | |
199 | #endif | |
200 | ||
201 | /* This function returns TRUE if pc is the address of an instruction | |
202 | that lies within the dynamic linker (such as the event hook, or the | |
203 | dld itself). | |
204 | ||
205 | This function must be used only when a dynamic linker event has | |
206 | been caught, and the inferior is being stepped out of the hook, or | |
207 | undefined results are guaranteed. */ | |
208 | ||
209 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
210 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
211 | #endif | |
212 | ||
213 | /* On MIPS16, a function that returns a floating point value may call | |
214 | a library helper function to copy the return value to a floating point | |
215 | register. The IGNORE_HELPER_CALL macro returns non-zero if we | |
216 | should ignore (i.e. step over) this function call. */ | |
217 | #ifndef IGNORE_HELPER_CALL | |
218 | #define IGNORE_HELPER_CALL(pc) 0 | |
219 | #endif | |
220 | ||
221 | /* On some systems, the PC may be left pointing at an instruction that won't | |
222 | actually be executed. This is usually indicated by a bit in the PSW. If | |
223 | we find ourselves in such a state, then we step the target beyond the | |
224 | nullified instruction before returning control to the user so as to avoid | |
225 | confusion. */ | |
226 | ||
227 | #ifndef INSTRUCTION_NULLIFIED | |
228 | #define INSTRUCTION_NULLIFIED 0 | |
229 | #endif | |
230 | ||
c2c6d25f JM |
231 | /* We can't step off a permanent breakpoint in the ordinary way, because we |
232 | can't remove it. Instead, we have to advance the PC to the next | |
233 | instruction. This macro should expand to a pointer to a function that | |
234 | does that, or zero if we have no such function. If we don't have a | |
235 | definition for it, we have to report an error. */ | |
236 | #ifndef SKIP_PERMANENT_BREAKPOINT | |
237 | #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint) | |
238 | static void | |
c2d11a7d | 239 | default_skip_permanent_breakpoint (void) |
c2c6d25f JM |
240 | { |
241 | error_begin (); | |
242 | fprintf_filtered (gdb_stderr, "\ | |
243 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
244 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
245 | a command like `return' or `jump' to continue execution.\n"); | |
246 | return_to_top_level (RETURN_ERROR); | |
247 | } | |
248 | #endif | |
249 | ||
250 | ||
7a292a7a SS |
251 | /* Convert the #defines into values. This is temporary until wfi control |
252 | flow is completely sorted out. */ | |
253 | ||
254 | #ifndef HAVE_STEPPABLE_WATCHPOINT | |
255 | #define HAVE_STEPPABLE_WATCHPOINT 0 | |
256 | #else | |
257 | #undef HAVE_STEPPABLE_WATCHPOINT | |
258 | #define HAVE_STEPPABLE_WATCHPOINT 1 | |
259 | #endif | |
260 | ||
261 | #ifndef HAVE_NONSTEPPABLE_WATCHPOINT | |
262 | #define HAVE_NONSTEPPABLE_WATCHPOINT 0 | |
263 | #else | |
264 | #undef HAVE_NONSTEPPABLE_WATCHPOINT | |
265 | #define HAVE_NONSTEPPABLE_WATCHPOINT 1 | |
266 | #endif | |
267 | ||
268 | #ifndef HAVE_CONTINUABLE_WATCHPOINT | |
269 | #define HAVE_CONTINUABLE_WATCHPOINT 0 | |
270 | #else | |
271 | #undef HAVE_CONTINUABLE_WATCHPOINT | |
272 | #define HAVE_CONTINUABLE_WATCHPOINT 1 | |
273 | #endif | |
274 | ||
692590c1 MS |
275 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
276 | #define CANNOT_STEP_HW_WATCHPOINTS 0 | |
277 | #else | |
278 | #undef CANNOT_STEP_HW_WATCHPOINTS | |
279 | #define CANNOT_STEP_HW_WATCHPOINTS 1 | |
280 | #endif | |
281 | ||
c906108c SS |
282 | /* Tables of how to react to signals; the user sets them. */ |
283 | ||
284 | static unsigned char *signal_stop; | |
285 | static unsigned char *signal_print; | |
286 | static unsigned char *signal_program; | |
287 | ||
288 | #define SET_SIGS(nsigs,sigs,flags) \ | |
289 | do { \ | |
290 | int signum = (nsigs); \ | |
291 | while (signum-- > 0) \ | |
292 | if ((sigs)[signum]) \ | |
293 | (flags)[signum] = 1; \ | |
294 | } while (0) | |
295 | ||
296 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
297 | do { \ | |
298 | int signum = (nsigs); \ | |
299 | while (signum-- > 0) \ | |
300 | if ((sigs)[signum]) \ | |
301 | (flags)[signum] = 0; \ | |
302 | } while (0) | |
303 | ||
39f77062 KB |
304 | /* Value to pass to target_resume() to cause all threads to resume */ |
305 | ||
306 | #define RESUME_ALL (pid_to_ptid (-1)) | |
c906108c SS |
307 | |
308 | /* Command list pointer for the "stop" placeholder. */ | |
309 | ||
310 | static struct cmd_list_element *stop_command; | |
311 | ||
312 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
313 | ||
314 | static int breakpoints_inserted; | |
315 | ||
316 | /* Function inferior was in as of last step command. */ | |
317 | ||
318 | static struct symbol *step_start_function; | |
319 | ||
320 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
321 | ||
322 | static int trap_expected; | |
323 | ||
324 | #ifdef SOLIB_ADD | |
325 | /* Nonzero if we want to give control to the user when we're notified | |
326 | of shared library events by the dynamic linker. */ | |
327 | static int stop_on_solib_events; | |
328 | #endif | |
329 | ||
330 | #ifdef HP_OS_BUG | |
331 | /* Nonzero if the next time we try to continue the inferior, it will | |
332 | step one instruction and generate a spurious trace trap. | |
333 | This is used to compensate for a bug in HP-UX. */ | |
334 | ||
335 | static int trap_expected_after_continue; | |
336 | #endif | |
337 | ||
338 | /* Nonzero means expecting a trace trap | |
339 | and should stop the inferior and return silently when it happens. */ | |
340 | ||
341 | int stop_after_trap; | |
342 | ||
343 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
344 | It is used after attach, due to attaching to a process; | |
345 | when running in the shell before the child program has been exec'd; | |
346 | and when running some kinds of remote stuff (FIXME?). */ | |
347 | ||
348 | int stop_soon_quietly; | |
349 | ||
350 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
351 | situation when stop_registers should be saved. */ | |
352 | ||
353 | int proceed_to_finish; | |
354 | ||
355 | /* Save register contents here when about to pop a stack dummy frame, | |
356 | if-and-only-if proceed_to_finish is set. | |
357 | Thus this contains the return value from the called function (assuming | |
358 | values are returned in a register). */ | |
359 | ||
7a292a7a | 360 | char *stop_registers; |
c906108c SS |
361 | |
362 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
363 | ||
364 | static int breakpoints_failed; | |
365 | ||
366 | /* Nonzero after stop if current stack frame should be printed. */ | |
367 | ||
368 | static int stop_print_frame; | |
369 | ||
370 | static struct breakpoint *step_resume_breakpoint = NULL; | |
371 | static struct breakpoint *through_sigtramp_breakpoint = NULL; | |
372 | ||
373 | /* On some platforms (e.g., HP-UX), hardware watchpoints have bad | |
374 | interactions with an inferior that is running a kernel function | |
375 | (aka, a system call or "syscall"). wait_for_inferior therefore | |
376 | may have a need to know when the inferior is in a syscall. This | |
377 | is a count of the number of inferior threads which are known to | |
378 | currently be running in a syscall. */ | |
379 | static int number_of_threads_in_syscalls; | |
380 | ||
e02bc4cc DS |
381 | /* This is a cached copy of the pid/waitstatus of the last event |
382 | returned by target_wait()/target_wait_hook(). This information is | |
383 | returned by get_last_target_status(). */ | |
39f77062 | 384 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
385 | static struct target_waitstatus target_last_waitstatus; |
386 | ||
c906108c SS |
387 | /* This is used to remember when a fork, vfork or exec event |
388 | was caught by a catchpoint, and thus the event is to be | |
389 | followed at the next resume of the inferior, and not | |
390 | immediately. */ | |
391 | static struct | |
392 | { | |
393 | enum target_waitkind kind; | |
394 | struct | |
395 | { | |
396 | int parent_pid; | |
397 | int saw_parent_fork; | |
398 | int child_pid; | |
399 | int saw_child_fork; | |
400 | int saw_child_exec; | |
401 | } | |
402 | fork_event; | |
403 | char *execd_pathname; | |
404 | } | |
405 | pending_follow; | |
406 | ||
407 | /* Some platforms don't allow us to do anything meaningful with a | |
408 | vforked child until it has exec'd. Vforked processes on such | |
409 | platforms can only be followed after they've exec'd. | |
410 | ||
411 | When this is set to 0, a vfork can be immediately followed, | |
412 | and an exec can be followed merely as an exec. When this is | |
413 | set to 1, a vfork event has been seen, but cannot be followed | |
414 | until the exec is seen. | |
415 | ||
39f77062 | 416 | (In the latter case, inferior_ptid is still the parent of the |
c906108c SS |
417 | vfork, and pending_follow.fork_event.child_pid is the child. The |
418 | appropriate process is followed, according to the setting of | |
419 | follow-fork-mode.) */ | |
420 | static int follow_vfork_when_exec; | |
421 | ||
53904c9e AC |
422 | static const char follow_fork_mode_ask[] = "ask"; |
423 | static const char follow_fork_mode_both[] = "both"; | |
424 | static const char follow_fork_mode_child[] = "child"; | |
425 | static const char follow_fork_mode_parent[] = "parent"; | |
426 | ||
427 | static const char *follow_fork_mode_kind_names[] = | |
c906108c | 428 | { |
53904c9e | 429 | follow_fork_mode_ask, |
ef346e04 AC |
430 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 |
431 | kernel problem. It's also not terribly useful without a GUI to | |
432 | help the user drive two debuggers. So for now, I'm disabling the | |
433 | "both" option. */ | |
53904c9e AC |
434 | /* follow_fork_mode_both, */ |
435 | follow_fork_mode_child, | |
436 | follow_fork_mode_parent, | |
437 | NULL | |
ef346e04 | 438 | }; |
c906108c | 439 | |
53904c9e | 440 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
c906108c SS |
441 | \f |
442 | ||
c906108c | 443 | static void |
96baa820 JM |
444 | follow_inferior_fork (int parent_pid, int child_pid, int has_forked, |
445 | int has_vforked) | |
c906108c SS |
446 | { |
447 | int followed_parent = 0; | |
448 | int followed_child = 0; | |
c906108c SS |
449 | |
450 | /* Which process did the user want us to follow? */ | |
53904c9e | 451 | const char *follow_mode = follow_fork_mode_string; |
c906108c SS |
452 | |
453 | /* Or, did the user not know, and want us to ask? */ | |
e28d556f | 454 | if (follow_fork_mode_string == follow_fork_mode_ask) |
c906108c | 455 | { |
8e65ff28 AC |
456 | internal_error (__FILE__, __LINE__, |
457 | "follow_inferior_fork: \"ask\" mode not implemented"); | |
53904c9e | 458 | /* follow_mode = follow_fork_mode_...; */ |
c906108c SS |
459 | } |
460 | ||
461 | /* If we're to be following the parent, then detach from child_pid. | |
462 | We're already following the parent, so need do nothing explicit | |
463 | for it. */ | |
53904c9e | 464 | if (follow_mode == follow_fork_mode_parent) |
c906108c SS |
465 | { |
466 | followed_parent = 1; | |
467 | ||
468 | /* We're already attached to the parent, by default. */ | |
469 | ||
470 | /* Before detaching from the child, remove all breakpoints from | |
471 | it. (This won't actually modify the breakpoint list, but will | |
472 | physically remove the breakpoints from the child.) */ | |
473 | if (!has_vforked || !follow_vfork_when_exec) | |
474 | { | |
475 | detach_breakpoints (child_pid); | |
7a292a7a | 476 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
c906108c | 477 | SOLIB_REMOVE_INFERIOR_HOOK (child_pid); |
7a292a7a | 478 | #endif |
c906108c SS |
479 | } |
480 | ||
481 | /* Detach from the child. */ | |
482 | dont_repeat (); | |
483 | ||
484 | target_require_detach (child_pid, "", 1); | |
485 | } | |
486 | ||
487 | /* If we're to be following the child, then attach to it, detach | |
39f77062 | 488 | from inferior_ptid, and set inferior_ptid to child_pid. */ |
53904c9e | 489 | else if (follow_mode == follow_fork_mode_child) |
c906108c SS |
490 | { |
491 | char child_pid_spelling[100]; /* Arbitrary length. */ | |
492 | ||
493 | followed_child = 1; | |
494 | ||
495 | /* Before detaching from the parent, detach all breakpoints from | |
496 | the child. But only if we're forking, or if we follow vforks | |
497 | as soon as they happen. (If we're following vforks only when | |
498 | the child has exec'd, then it's very wrong to try to write | |
499 | back the "shadow contents" of inserted breakpoints now -- they | |
500 | belong to the child's pre-exec'd a.out.) */ | |
501 | if (!has_vforked || !follow_vfork_when_exec) | |
502 | { | |
503 | detach_breakpoints (child_pid); | |
504 | } | |
505 | ||
506 | /* Before detaching from the parent, remove all breakpoints from it. */ | |
507 | remove_breakpoints (); | |
508 | ||
509 | /* Also reset the solib inferior hook from the parent. */ | |
7a292a7a | 510 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
39f77062 | 511 | SOLIB_REMOVE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
7a292a7a | 512 | #endif |
c906108c SS |
513 | |
514 | /* Detach from the parent. */ | |
515 | dont_repeat (); | |
516 | target_detach (NULL, 1); | |
517 | ||
518 | /* Attach to the child. */ | |
39f77062 | 519 | inferior_ptid = pid_to_ptid (child_pid); |
c906108c SS |
520 | sprintf (child_pid_spelling, "%d", child_pid); |
521 | dont_repeat (); | |
522 | ||
523 | target_require_attach (child_pid_spelling, 1); | |
524 | ||
525 | /* Was there a step_resume breakpoint? (There was if the user | |
526 | did a "next" at the fork() call.) If so, explicitly reset its | |
527 | thread number. | |
528 | ||
529 | step_resumes are a form of bp that are made to be per-thread. | |
530 | Since we created the step_resume bp when the parent process | |
531 | was being debugged, and now are switching to the child process, | |
532 | from the breakpoint package's viewpoint, that's a switch of | |
533 | "threads". We must update the bp's notion of which thread | |
534 | it is for, or it'll be ignored when it triggers... */ | |
535 | if (step_resume_breakpoint && | |
536 | (!has_vforked || !follow_vfork_when_exec)) | |
537 | breakpoint_re_set_thread (step_resume_breakpoint); | |
538 | ||
539 | /* Reinsert all breakpoints in the child. (The user may've set | |
540 | breakpoints after catching the fork, in which case those | |
541 | actually didn't get set in the child, but only in the parent.) */ | |
542 | if (!has_vforked || !follow_vfork_when_exec) | |
543 | { | |
544 | breakpoint_re_set (); | |
545 | insert_breakpoints (); | |
546 | } | |
547 | } | |
548 | ||
549 | /* If we're to be following both parent and child, then fork ourselves, | |
550 | and attach the debugger clone to the child. */ | |
53904c9e | 551 | else if (follow_mode == follow_fork_mode_both) |
c906108c SS |
552 | { |
553 | char pid_suffix[100]; /* Arbitrary length. */ | |
554 | ||
555 | /* Clone ourselves to follow the child. This is the end of our | |
c5aa993b | 556 | involvement with child_pid; our clone will take it from here... */ |
c906108c SS |
557 | dont_repeat (); |
558 | target_clone_and_follow_inferior (child_pid, &followed_child); | |
559 | followed_parent = !followed_child; | |
560 | ||
561 | /* We continue to follow the parent. To help distinguish the two | |
562 | debuggers, though, both we and our clone will reset our prompts. */ | |
39f77062 | 563 | sprintf (pid_suffix, "[%d] ", PIDGET (inferior_ptid)); |
c906108c SS |
564 | set_prompt (strcat (get_prompt (), pid_suffix)); |
565 | } | |
566 | ||
567 | /* The parent and child of a vfork share the same address space. | |
568 | Also, on some targets the order in which vfork and exec events | |
569 | are received for parent in child requires some delicate handling | |
570 | of the events. | |
571 | ||
572 | For instance, on ptrace-based HPUX we receive the child's vfork | |
573 | event first, at which time the parent has been suspended by the | |
574 | OS and is essentially untouchable until the child's exit or second | |
575 | exec event arrives. At that time, the parent's vfork event is | |
576 | delivered to us, and that's when we see and decide how to follow | |
577 | the vfork. But to get to that point, we must continue the child | |
578 | until it execs or exits. To do that smoothly, all breakpoints | |
579 | must be removed from the child, in case there are any set between | |
580 | the vfork() and exec() calls. But removing them from the child | |
581 | also removes them from the parent, due to the shared-address-space | |
582 | nature of a vfork'd parent and child. On HPUX, therefore, we must | |
583 | take care to restore the bp's to the parent before we continue it. | |
584 | Else, it's likely that we may not stop in the expected place. (The | |
585 | worst scenario is when the user tries to step over a vfork() call; | |
586 | the step-resume bp must be restored for the step to properly stop | |
587 | in the parent after the call completes!) | |
588 | ||
589 | Sequence of events, as reported to gdb from HPUX: | |
590 | ||
c5aa993b JM |
591 | Parent Child Action for gdb to take |
592 | ------------------------------------------------------- | |
593 | 1 VFORK Continue child | |
594 | 2 EXEC | |
595 | 3 EXEC or EXIT | |
596 | 4 VFORK */ | |
c906108c SS |
597 | if (has_vforked) |
598 | { | |
599 | target_post_follow_vfork (parent_pid, | |
600 | followed_parent, | |
601 | child_pid, | |
602 | followed_child); | |
603 | } | |
604 | ||
605 | pending_follow.fork_event.saw_parent_fork = 0; | |
606 | pending_follow.fork_event.saw_child_fork = 0; | |
c906108c SS |
607 | } |
608 | ||
609 | static void | |
96baa820 | 610 | follow_fork (int parent_pid, int child_pid) |
c906108c SS |
611 | { |
612 | follow_inferior_fork (parent_pid, child_pid, 1, 0); | |
613 | } | |
614 | ||
615 | ||
616 | /* Forward declaration. */ | |
96baa820 | 617 | static void follow_exec (int, char *); |
c906108c SS |
618 | |
619 | static void | |
96baa820 | 620 | follow_vfork (int parent_pid, int child_pid) |
c906108c SS |
621 | { |
622 | follow_inferior_fork (parent_pid, child_pid, 0, 1); | |
623 | ||
624 | /* Did we follow the child? Had it exec'd before we saw the parent vfork? */ | |
39f77062 KB |
625 | if (pending_follow.fork_event.saw_child_exec |
626 | && (PIDGET (inferior_ptid) == child_pid)) | |
c906108c SS |
627 | { |
628 | pending_follow.fork_event.saw_child_exec = 0; | |
629 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
39f77062 | 630 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); |
b8c9b27d | 631 | xfree (pending_follow.execd_pathname); |
c906108c SS |
632 | } |
633 | } | |
c906108c | 634 | |
1adeb98a FN |
635 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
636 | ||
c906108c | 637 | static void |
96baa820 | 638 | follow_exec (int pid, char *execd_pathname) |
c906108c | 639 | { |
c906108c | 640 | int saved_pid = pid; |
7a292a7a SS |
641 | struct target_ops *tgt; |
642 | ||
643 | if (!may_follow_exec) | |
644 | return; | |
c906108c SS |
645 | |
646 | /* Did this exec() follow a vfork()? If so, we must follow the | |
647 | vfork now too. Do it before following the exec. */ | |
648 | if (follow_vfork_when_exec && | |
649 | (pending_follow.kind == TARGET_WAITKIND_VFORKED)) | |
650 | { | |
651 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
39f77062 KB |
652 | follow_vfork (PIDGET (inferior_ptid), |
653 | pending_follow.fork_event.child_pid); | |
c906108c | 654 | follow_vfork_when_exec = 0; |
39f77062 | 655 | saved_pid = PIDGET (inferior_ptid); |
c906108c SS |
656 | |
657 | /* Did we follow the parent? If so, we're done. If we followed | |
658 | the child then we must also follow its exec(). */ | |
39f77062 | 659 | if (PIDGET (inferior_ptid) == pending_follow.fork_event.parent_pid) |
c906108c SS |
660 | return; |
661 | } | |
662 | ||
663 | /* This is an exec event that we actually wish to pay attention to. | |
664 | Refresh our symbol table to the newly exec'd program, remove any | |
665 | momentary bp's, etc. | |
666 | ||
667 | If there are breakpoints, they aren't really inserted now, | |
668 | since the exec() transformed our inferior into a fresh set | |
669 | of instructions. | |
670 | ||
671 | We want to preserve symbolic breakpoints on the list, since | |
672 | we have hopes that they can be reset after the new a.out's | |
673 | symbol table is read. | |
674 | ||
675 | However, any "raw" breakpoints must be removed from the list | |
676 | (e.g., the solib bp's), since their address is probably invalid | |
677 | now. | |
678 | ||
679 | And, we DON'T want to call delete_breakpoints() here, since | |
680 | that may write the bp's "shadow contents" (the instruction | |
681 | value that was overwritten witha TRAP instruction). Since | |
682 | we now have a new a.out, those shadow contents aren't valid. */ | |
683 | update_breakpoints_after_exec (); | |
684 | ||
685 | /* If there was one, it's gone now. We cannot truly step-to-next | |
686 | statement through an exec(). */ | |
687 | step_resume_breakpoint = NULL; | |
688 | step_range_start = 0; | |
689 | step_range_end = 0; | |
690 | ||
691 | /* If there was one, it's gone now. */ | |
692 | through_sigtramp_breakpoint = NULL; | |
693 | ||
694 | /* What is this a.out's name? */ | |
695 | printf_unfiltered ("Executing new program: %s\n", execd_pathname); | |
696 | ||
697 | /* We've followed the inferior through an exec. Therefore, the | |
698 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
699 | |
700 | /* First collect the run target in effect. */ | |
701 | tgt = find_run_target (); | |
702 | /* If we can't find one, things are in a very strange state... */ | |
703 | if (tgt == NULL) | |
704 | error ("Could find run target to save before following exec"); | |
705 | ||
c906108c SS |
706 | gdb_flush (gdb_stdout); |
707 | target_mourn_inferior (); | |
39f77062 KB |
708 | inferior_ptid = pid_to_ptid (saved_pid); |
709 | /* Because mourn_inferior resets inferior_ptid. */ | |
7a292a7a | 710 | push_target (tgt); |
c906108c SS |
711 | |
712 | /* That a.out is now the one to use. */ | |
713 | exec_file_attach (execd_pathname, 0); | |
714 | ||
715 | /* And also is where symbols can be found. */ | |
1adeb98a | 716 | symbol_file_add_main (execd_pathname, 0); |
c906108c SS |
717 | |
718 | /* Reset the shared library package. This ensures that we get | |
719 | a shlib event when the child reaches "_start", at which point | |
720 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 721 | #if defined(SOLIB_RESTART) |
c906108c | 722 | SOLIB_RESTART (); |
7a292a7a SS |
723 | #endif |
724 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
39f77062 | 725 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
7a292a7a | 726 | #endif |
c906108c SS |
727 | |
728 | /* Reinsert all breakpoints. (Those which were symbolic have | |
729 | been reset to the proper address in the new a.out, thanks | |
730 | to symbol_file_command...) */ | |
731 | insert_breakpoints (); | |
732 | ||
733 | /* The next resume of this inferior should bring it to the shlib | |
734 | startup breakpoints. (If the user had also set bp's on | |
735 | "main" from the old (parent) process, then they'll auto- | |
736 | matically get reset there in the new process.) */ | |
c906108c SS |
737 | } |
738 | ||
739 | /* Non-zero if we just simulating a single-step. This is needed | |
740 | because we cannot remove the breakpoints in the inferior process | |
741 | until after the `wait' in `wait_for_inferior'. */ | |
742 | static int singlestep_breakpoints_inserted_p = 0; | |
743 | \f | |
744 | ||
745 | /* Things to clean up if we QUIT out of resume (). */ | |
746 | /* ARGSUSED */ | |
747 | static void | |
74b7792f | 748 | resume_cleanups (void *ignore) |
c906108c SS |
749 | { |
750 | normal_stop (); | |
751 | } | |
752 | ||
53904c9e AC |
753 | static const char schedlock_off[] = "off"; |
754 | static const char schedlock_on[] = "on"; | |
755 | static const char schedlock_step[] = "step"; | |
756 | static const char *scheduler_mode = schedlock_off; | |
757 | static const char *scheduler_enums[] = | |
ef346e04 AC |
758 | { |
759 | schedlock_off, | |
760 | schedlock_on, | |
761 | schedlock_step, | |
762 | NULL | |
763 | }; | |
c906108c SS |
764 | |
765 | static void | |
96baa820 | 766 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c SS |
767 | { |
768 | if (c->type == set_cmd) | |
769 | if (!target_can_lock_scheduler) | |
770 | { | |
771 | scheduler_mode = schedlock_off; | |
772 | error ("Target '%s' cannot support this command.", | |
773 | target_shortname); | |
774 | } | |
775 | } | |
776 | ||
777 | ||
778 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
779 | wants to interrupt some lengthy single-stepping operation | |
780 | (for child processes, the SIGINT goes to the inferior, and so | |
781 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
782 | other targets, that's not true). | |
783 | ||
784 | STEP nonzero if we should step (zero to continue instead). | |
785 | SIG is the signal to give the inferior (zero for none). */ | |
786 | void | |
96baa820 | 787 | resume (int step, enum target_signal sig) |
c906108c SS |
788 | { |
789 | int should_resume = 1; | |
74b7792f | 790 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
c906108c SS |
791 | QUIT; |
792 | ||
ef5cf84e MS |
793 | /* FIXME: calling breakpoint_here_p (read_pc ()) three times! */ |
794 | ||
c906108c | 795 | |
692590c1 MS |
796 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
797 | over an instruction that causes a page fault without triggering | |
798 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
799 | stop, because the hardware watchpoint is not triggered, but it forgets | |
800 | the step request and continues the program normally. | |
801 | Work around the problem by removing hardware watchpoints if a step is | |
802 | requested, GDB will check for a hardware watchpoint trigger after the | |
803 | step anyway. */ | |
804 | if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) | |
805 | remove_hw_watchpoints (); | |
806 | ||
807 | ||
c2c6d25f JM |
808 | /* Normally, by the time we reach `resume', the breakpoints are either |
809 | removed or inserted, as appropriate. The exception is if we're sitting | |
810 | at a permanent breakpoint; we need to step over it, but permanent | |
811 | breakpoints can't be removed. So we have to test for it here. */ | |
812 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
813 | SKIP_PERMANENT_BREAKPOINT (); | |
814 | ||
b0ed3589 | 815 | if (SOFTWARE_SINGLE_STEP_P () && step) |
c906108c SS |
816 | { |
817 | /* Do it the hard way, w/temp breakpoints */ | |
c5aa993b | 818 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
c906108c SS |
819 | /* ...and don't ask hardware to do it. */ |
820 | step = 0; | |
821 | /* and do not pull these breakpoints until after a `wait' in | |
822 | `wait_for_inferior' */ | |
823 | singlestep_breakpoints_inserted_p = 1; | |
824 | } | |
825 | ||
826 | /* Handle any optimized stores to the inferior NOW... */ | |
827 | #ifdef DO_DEFERRED_STORES | |
828 | DO_DEFERRED_STORES; | |
829 | #endif | |
830 | ||
c906108c SS |
831 | /* If there were any forks/vforks/execs that were caught and are |
832 | now to be followed, then do so. */ | |
833 | switch (pending_follow.kind) | |
834 | { | |
835 | case (TARGET_WAITKIND_FORKED): | |
836 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
39f77062 KB |
837 | follow_fork (PIDGET (inferior_ptid), |
838 | pending_follow.fork_event.child_pid); | |
c906108c SS |
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; | |
39f77062 KB |
846 | follow_vfork (PIDGET (inferior_ptid), |
847 | pending_follow.fork_event.child_pid); | |
c906108c SS |
848 | |
849 | /* Did we follow the child, but not yet see the child's exec event? | |
c5aa993b JM |
850 | If so, then it actually ought to be waiting for us; we respond to |
851 | parent vfork events. We don't actually want to resume the child | |
852 | in this situation; we want to just get its exec event. */ | |
c906108c | 853 | if (!saw_child_exec && |
39f77062 | 854 | (PIDGET (inferior_ptid) == pending_follow.fork_event.child_pid)) |
c906108c SS |
855 | should_resume = 0; |
856 | } | |
857 | break; | |
858 | ||
859 | case (TARGET_WAITKIND_EXECD): | |
860 | /* If we saw a vfork event but couldn't follow it until we saw | |
c5aa993b | 861 | an exec, then now might be the time! */ |
c906108c SS |
862 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
863 | /* follow_exec is called as soon as the exec event is seen. */ | |
864 | break; | |
865 | ||
866 | default: | |
867 | break; | |
868 | } | |
c906108c SS |
869 | |
870 | /* Install inferior's terminal modes. */ | |
871 | target_terminal_inferior (); | |
872 | ||
873 | if (should_resume) | |
874 | { | |
39f77062 | 875 | ptid_t resume_ptid; |
dfcd3bfb | 876 | |
ef5cf84e MS |
877 | resume_ptid = RESUME_ALL; /* Default */ |
878 | ||
879 | if ((step || singlestep_breakpoints_inserted_p) && | |
880 | !breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
c906108c | 881 | { |
ef5cf84e MS |
882 | /* Stepping past a breakpoint without inserting breakpoints. |
883 | Make sure only the current thread gets to step, so that | |
884 | other threads don't sneak past breakpoints while they are | |
885 | not inserted. */ | |
c906108c | 886 | |
ef5cf84e | 887 | resume_ptid = inferior_ptid; |
c906108c | 888 | } |
ef5cf84e MS |
889 | |
890 | if ((scheduler_mode == schedlock_on) || | |
891 | (scheduler_mode == schedlock_step && | |
892 | (step || singlestep_breakpoints_inserted_p))) | |
c906108c | 893 | { |
ef5cf84e | 894 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
39f77062 | 895 | resume_ptid = inferior_ptid; |
c906108c | 896 | } |
ef5cf84e MS |
897 | |
898 | #ifdef CANNOT_STEP_BREAKPOINT | |
899 | /* Most targets can step a breakpoint instruction, thus executing it | |
900 | normally. But if this one cannot, just continue and we will hit | |
901 | it anyway. */ | |
902 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
903 | step = 0; | |
904 | #endif | |
39f77062 | 905 | target_resume (resume_ptid, step, sig); |
c906108c SS |
906 | } |
907 | ||
908 | discard_cleanups (old_cleanups); | |
909 | } | |
910 | \f | |
911 | ||
912 | /* Clear out all variables saying what to do when inferior is continued. | |
913 | First do this, then set the ones you want, then call `proceed'. */ | |
914 | ||
915 | void | |
96baa820 | 916 | clear_proceed_status (void) |
c906108c SS |
917 | { |
918 | trap_expected = 0; | |
919 | step_range_start = 0; | |
920 | step_range_end = 0; | |
921 | step_frame_address = 0; | |
5fbbeb29 | 922 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c SS |
923 | stop_after_trap = 0; |
924 | stop_soon_quietly = 0; | |
925 | proceed_to_finish = 0; | |
926 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
927 | ||
928 | /* Discard any remaining commands or status from previous stop. */ | |
929 | bpstat_clear (&stop_bpstat); | |
930 | } | |
931 | ||
932 | /* Basic routine for continuing the program in various fashions. | |
933 | ||
934 | ADDR is the address to resume at, or -1 for resume where stopped. | |
935 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 936 | or -1 for act according to how it stopped. |
c906108c | 937 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
938 | -1 means return after that and print nothing. |
939 | You should probably set various step_... variables | |
940 | before calling here, if you are stepping. | |
c906108c SS |
941 | |
942 | You should call clear_proceed_status before calling proceed. */ | |
943 | ||
944 | void | |
96baa820 | 945 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
946 | { |
947 | int oneproc = 0; | |
948 | ||
949 | if (step > 0) | |
950 | step_start_function = find_pc_function (read_pc ()); | |
951 | if (step < 0) | |
952 | stop_after_trap = 1; | |
953 | ||
2acceee2 | 954 | if (addr == (CORE_ADDR) -1) |
c906108c SS |
955 | { |
956 | /* If there is a breakpoint at the address we will resume at, | |
c5aa993b JM |
957 | step one instruction before inserting breakpoints |
958 | so that we do not stop right away (and report a second | |
c906108c SS |
959 | hit at this breakpoint). */ |
960 | ||
961 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) | |
962 | oneproc = 1; | |
963 | ||
964 | #ifndef STEP_SKIPS_DELAY | |
965 | #define STEP_SKIPS_DELAY(pc) (0) | |
966 | #define STEP_SKIPS_DELAY_P (0) | |
967 | #endif | |
968 | /* Check breakpoint_here_p first, because breakpoint_here_p is fast | |
c5aa993b JM |
969 | (it just checks internal GDB data structures) and STEP_SKIPS_DELAY |
970 | is slow (it needs to read memory from the target). */ | |
c906108c SS |
971 | if (STEP_SKIPS_DELAY_P |
972 | && breakpoint_here_p (read_pc () + 4) | |
973 | && STEP_SKIPS_DELAY (read_pc ())) | |
974 | oneproc = 1; | |
975 | } | |
976 | else | |
977 | { | |
978 | write_pc (addr); | |
c906108c SS |
979 | } |
980 | ||
981 | #ifdef PREPARE_TO_PROCEED | |
982 | /* In a multi-threaded task we may select another thread | |
983 | and then continue or step. | |
984 | ||
985 | But if the old thread was stopped at a breakpoint, it | |
986 | will immediately cause another breakpoint stop without | |
987 | any execution (i.e. it will report a breakpoint hit | |
988 | incorrectly). So we must step over it first. | |
989 | ||
990 | PREPARE_TO_PROCEED checks the current thread against the thread | |
991 | that reported the most recent event. If a step-over is required | |
992 | it returns TRUE and sets the current thread to the old thread. */ | |
9e086581 | 993 | if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ())) |
c906108c SS |
994 | { |
995 | oneproc = 1; | |
c906108c SS |
996 | } |
997 | ||
998 | #endif /* PREPARE_TO_PROCEED */ | |
999 | ||
1000 | #ifdef HP_OS_BUG | |
1001 | if (trap_expected_after_continue) | |
1002 | { | |
1003 | /* If (step == 0), a trap will be automatically generated after | |
c5aa993b JM |
1004 | the first instruction is executed. Force step one |
1005 | instruction to clear this condition. This should not occur | |
1006 | if step is nonzero, but it is harmless in that case. */ | |
c906108c SS |
1007 | oneproc = 1; |
1008 | trap_expected_after_continue = 0; | |
1009 | } | |
1010 | #endif /* HP_OS_BUG */ | |
1011 | ||
1012 | if (oneproc) | |
1013 | /* We will get a trace trap after one instruction. | |
1014 | Continue it automatically and insert breakpoints then. */ | |
1015 | trap_expected = 1; | |
1016 | else | |
1017 | { | |
1018 | int temp = insert_breakpoints (); | |
1019 | if (temp) | |
1020 | { | |
010a3cd9 | 1021 | print_sys_errmsg ("insert_breakpoints", temp); |
c906108c | 1022 | error ("Cannot insert breakpoints.\n\ |
010a3cd9 EZ |
1023 | The same program may be running in another process,\n\ |
1024 | or you may have requested too many hardware\n\ | |
1025 | breakpoints and/or watchpoints.\n"); | |
c906108c SS |
1026 | } |
1027 | ||
1028 | breakpoints_inserted = 1; | |
1029 | } | |
1030 | ||
1031 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
1032 | stop_signal = siggnal; | |
1033 | /* If this signal should not be seen by program, | |
1034 | give it zero. Used for debugging signals. */ | |
1035 | else if (!signal_program[stop_signal]) | |
1036 | stop_signal = TARGET_SIGNAL_0; | |
1037 | ||
1038 | annotate_starting (); | |
1039 | ||
1040 | /* Make sure that output from GDB appears before output from the | |
1041 | inferior. */ | |
1042 | gdb_flush (gdb_stdout); | |
1043 | ||
1044 | /* Resume inferior. */ | |
1045 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
1046 | ||
1047 | /* Wait for it to stop (if not standalone) | |
1048 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
1049 | /* Do this only if we are not using the event loop, or if the target |
1050 | does not support asynchronous execution. */ | |
6426a772 | 1051 | if (!event_loop_p || !target_can_async_p ()) |
43ff13b4 JM |
1052 | { |
1053 | wait_for_inferior (); | |
1054 | normal_stop (); | |
1055 | } | |
c906108c SS |
1056 | } |
1057 | ||
1058 | /* Record the pc and sp of the program the last time it stopped. | |
1059 | These are just used internally by wait_for_inferior, but need | |
1060 | to be preserved over calls to it and cleared when the inferior | |
1061 | is started. */ | |
1062 | static CORE_ADDR prev_pc; | |
1063 | static CORE_ADDR prev_func_start; | |
1064 | static char *prev_func_name; | |
1065 | \f | |
1066 | ||
1067 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 1068 | |
c906108c | 1069 | void |
96baa820 | 1070 | start_remote (void) |
c906108c SS |
1071 | { |
1072 | init_thread_list (); | |
1073 | init_wait_for_inferior (); | |
1074 | stop_soon_quietly = 1; | |
1075 | trap_expected = 0; | |
43ff13b4 | 1076 | |
6426a772 JM |
1077 | /* Always go on waiting for the target, regardless of the mode. */ |
1078 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 1079 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
1080 | nothing is returned (instead of just blocking). Because of this, |
1081 | targets expecting an immediate response need to, internally, set | |
1082 | things up so that the target_wait() is forced to eventually | |
1083 | timeout. */ | |
1084 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
1085 | differentiate to its caller what the state of the target is after | |
1086 | the initial open has been performed. Here we're assuming that | |
1087 | the target has stopped. It should be possible to eventually have | |
1088 | target_open() return to the caller an indication that the target | |
1089 | is currently running and GDB state should be set to the same as | |
1090 | for an async run. */ | |
1091 | wait_for_inferior (); | |
1092 | normal_stop (); | |
c906108c SS |
1093 | } |
1094 | ||
1095 | /* Initialize static vars when a new inferior begins. */ | |
1096 | ||
1097 | void | |
96baa820 | 1098 | init_wait_for_inferior (void) |
c906108c SS |
1099 | { |
1100 | /* These are meaningless until the first time through wait_for_inferior. */ | |
1101 | prev_pc = 0; | |
1102 | prev_func_start = 0; | |
1103 | prev_func_name = NULL; | |
1104 | ||
1105 | #ifdef HP_OS_BUG | |
1106 | trap_expected_after_continue = 0; | |
1107 | #endif | |
1108 | breakpoints_inserted = 0; | |
1109 | breakpoint_init_inferior (inf_starting); | |
1110 | ||
1111 | /* Don't confuse first call to proceed(). */ | |
1112 | stop_signal = TARGET_SIGNAL_0; | |
1113 | ||
1114 | /* The first resume is not following a fork/vfork/exec. */ | |
1115 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
1116 | pending_follow.fork_event.saw_parent_fork = 0; | |
1117 | pending_follow.fork_event.saw_child_fork = 0; | |
1118 | pending_follow.fork_event.saw_child_exec = 0; | |
1119 | ||
1120 | /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ | |
1121 | number_of_threads_in_syscalls = 0; | |
1122 | ||
1123 | clear_proceed_status (); | |
1124 | } | |
1125 | ||
1126 | static void | |
96baa820 | 1127 | delete_breakpoint_current_contents (void *arg) |
c906108c SS |
1128 | { |
1129 | struct breakpoint **breakpointp = (struct breakpoint **) arg; | |
1130 | if (*breakpointp != NULL) | |
1131 | { | |
1132 | delete_breakpoint (*breakpointp); | |
1133 | *breakpointp = NULL; | |
1134 | } | |
1135 | } | |
1136 | \f | |
b83266a0 SS |
1137 | /* This enum encodes possible reasons for doing a target_wait, so that |
1138 | wfi can call target_wait in one place. (Ultimately the call will be | |
1139 | moved out of the infinite loop entirely.) */ | |
1140 | ||
c5aa993b JM |
1141 | enum infwait_states |
1142 | { | |
cd0fc7c3 SS |
1143 | infwait_normal_state, |
1144 | infwait_thread_hop_state, | |
1145 | infwait_nullified_state, | |
1146 | infwait_nonstep_watch_state | |
b83266a0 SS |
1147 | }; |
1148 | ||
11cf8741 JM |
1149 | /* Why did the inferior stop? Used to print the appropriate messages |
1150 | to the interface from within handle_inferior_event(). */ | |
1151 | enum inferior_stop_reason | |
1152 | { | |
1153 | /* We don't know why. */ | |
1154 | STOP_UNKNOWN, | |
1155 | /* Step, next, nexti, stepi finished. */ | |
1156 | END_STEPPING_RANGE, | |
1157 | /* Found breakpoint. */ | |
1158 | BREAKPOINT_HIT, | |
1159 | /* Inferior terminated by signal. */ | |
1160 | SIGNAL_EXITED, | |
1161 | /* Inferior exited. */ | |
1162 | EXITED, | |
1163 | /* Inferior received signal, and user asked to be notified. */ | |
1164 | SIGNAL_RECEIVED | |
1165 | }; | |
1166 | ||
cd0fc7c3 SS |
1167 | /* This structure contains what used to be local variables in |
1168 | wait_for_inferior. Probably many of them can return to being | |
1169 | locals in handle_inferior_event. */ | |
1170 | ||
c5aa993b JM |
1171 | struct execution_control_state |
1172 | { | |
1173 | struct target_waitstatus ws; | |
1174 | struct target_waitstatus *wp; | |
1175 | int another_trap; | |
1176 | int random_signal; | |
1177 | CORE_ADDR stop_func_start; | |
1178 | CORE_ADDR stop_func_end; | |
1179 | char *stop_func_name; | |
1180 | struct symtab_and_line sal; | |
1181 | int remove_breakpoints_on_following_step; | |
1182 | int current_line; | |
1183 | struct symtab *current_symtab; | |
1184 | int handling_longjmp; /* FIXME */ | |
39f77062 KB |
1185 | ptid_t ptid; |
1186 | ptid_t saved_inferior_ptid; | |
c5aa993b JM |
1187 | int update_step_sp; |
1188 | int stepping_through_solib_after_catch; | |
1189 | bpstat stepping_through_solib_catchpoints; | |
1190 | int enable_hw_watchpoints_after_wait; | |
1191 | int stepping_through_sigtramp; | |
1192 | int new_thread_event; | |
1193 | struct target_waitstatus tmpstatus; | |
1194 | enum infwait_states infwait_state; | |
39f77062 | 1195 | ptid_t waiton_ptid; |
c5aa993b JM |
1196 | int wait_some_more; |
1197 | }; | |
1198 | ||
96baa820 | 1199 | void init_execution_control_state (struct execution_control_state * ecs); |
c5aa993b | 1200 | |
96baa820 | 1201 | void handle_inferior_event (struct execution_control_state * ecs); |
cd0fc7c3 | 1202 | |
104c1213 | 1203 | static void check_sigtramp2 (struct execution_control_state *ecs); |
c2c6d25f | 1204 | static void step_into_function (struct execution_control_state *ecs); |
d4f3574e | 1205 | static void step_over_function (struct execution_control_state *ecs); |
104c1213 JM |
1206 | static void stop_stepping (struct execution_control_state *ecs); |
1207 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 1208 | static void keep_going (struct execution_control_state *ecs); |
11cf8741 | 1209 | static void print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info); |
104c1213 | 1210 | |
cd0fc7c3 SS |
1211 | /* Wait for control to return from inferior to debugger. |
1212 | If inferior gets a signal, we may decide to start it up again | |
1213 | instead of returning. That is why there is a loop in this function. | |
1214 | When this function actually returns it means the inferior | |
1215 | should be left stopped and GDB should read more commands. */ | |
1216 | ||
1217 | void | |
96baa820 | 1218 | wait_for_inferior (void) |
cd0fc7c3 SS |
1219 | { |
1220 | struct cleanup *old_cleanups; | |
1221 | struct execution_control_state ecss; | |
1222 | struct execution_control_state *ecs; | |
c906108c | 1223 | |
8601f500 | 1224 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c SS |
1225 | &step_resume_breakpoint); |
1226 | make_cleanup (delete_breakpoint_current_contents, | |
1227 | &through_sigtramp_breakpoint); | |
cd0fc7c3 SS |
1228 | |
1229 | /* wfi still stays in a loop, so it's OK just to take the address of | |
1230 | a local to get the ecs pointer. */ | |
1231 | ecs = &ecss; | |
1232 | ||
1233 | /* Fill in with reasonable starting values. */ | |
1234 | init_execution_control_state (ecs); | |
1235 | ||
c906108c | 1236 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1237 | previous_inferior_ptid = inferior_ptid; |
c906108c | 1238 | |
cd0fc7c3 SS |
1239 | overlay_cache_invalid = 1; |
1240 | ||
1241 | /* We have to invalidate the registers BEFORE calling target_wait | |
1242 | because they can be loaded from the target while in target_wait. | |
1243 | This makes remote debugging a bit more efficient for those | |
1244 | targets that provide critical registers as part of their normal | |
1245 | status mechanism. */ | |
1246 | ||
1247 | registers_changed (); | |
b83266a0 | 1248 | |
c906108c SS |
1249 | while (1) |
1250 | { | |
cd0fc7c3 | 1251 | if (target_wait_hook) |
39f77062 | 1252 | ecs->ptid = target_wait_hook (ecs->waiton_ptid, ecs->wp); |
cd0fc7c3 | 1253 | else |
39f77062 | 1254 | ecs->ptid = target_wait (ecs->waiton_ptid, ecs->wp); |
c906108c | 1255 | |
cd0fc7c3 SS |
1256 | /* Now figure out what to do with the result of the result. */ |
1257 | handle_inferior_event (ecs); | |
c906108c | 1258 | |
cd0fc7c3 SS |
1259 | if (!ecs->wait_some_more) |
1260 | break; | |
1261 | } | |
1262 | do_cleanups (old_cleanups); | |
1263 | } | |
c906108c | 1264 | |
43ff13b4 JM |
1265 | /* Asynchronous version of wait_for_inferior. It is called by the |
1266 | event loop whenever a change of state is detected on the file | |
1267 | descriptor corresponding to the target. It can be called more than | |
1268 | once to complete a single execution command. In such cases we need | |
1269 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1270 | last time that this function is called for a single execution | |
1271 | command, then report to the user that the inferior has stopped, and | |
1272 | do the necessary cleanups. */ | |
1273 | ||
1274 | struct execution_control_state async_ecss; | |
1275 | struct execution_control_state *async_ecs; | |
1276 | ||
1277 | void | |
fba45db2 | 1278 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1279 | { |
1280 | static struct cleanup *old_cleanups; | |
1281 | ||
c5aa993b | 1282 | async_ecs = &async_ecss; |
43ff13b4 JM |
1283 | |
1284 | if (!async_ecs->wait_some_more) | |
1285 | { | |
8601f500 | 1286 | old_cleanups = make_exec_cleanup (delete_step_resume_breakpoint, |
c5aa993b | 1287 | &step_resume_breakpoint); |
43ff13b4 | 1288 | make_exec_cleanup (delete_breakpoint_current_contents, |
c5aa993b | 1289 | &through_sigtramp_breakpoint); |
43ff13b4 JM |
1290 | |
1291 | /* Fill in with reasonable starting values. */ | |
1292 | init_execution_control_state (async_ecs); | |
1293 | ||
43ff13b4 | 1294 | /* We'll update this if & when we switch to a new thread. */ |
39f77062 | 1295 | previous_inferior_ptid = inferior_ptid; |
43ff13b4 JM |
1296 | |
1297 | overlay_cache_invalid = 1; | |
1298 | ||
1299 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1300 | because they can be loaded from the target while in target_wait. |
1301 | This makes remote debugging a bit more efficient for those | |
1302 | targets that provide critical registers as part of their normal | |
1303 | status mechanism. */ | |
43ff13b4 JM |
1304 | |
1305 | registers_changed (); | |
1306 | } | |
1307 | ||
1308 | if (target_wait_hook) | |
39f77062 | 1309 | async_ecs->ptid = target_wait_hook (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 | 1310 | else |
39f77062 | 1311 | async_ecs->ptid = target_wait (async_ecs->waiton_ptid, async_ecs->wp); |
43ff13b4 JM |
1312 | |
1313 | /* Now figure out what to do with the result of the result. */ | |
1314 | handle_inferior_event (async_ecs); | |
1315 | ||
1316 | if (!async_ecs->wait_some_more) | |
1317 | { | |
adf40b2e JM |
1318 | /* Do only the cleanups that have been added by this |
1319 | function. Let the continuations for the commands do the rest, | |
1320 | if there are any. */ | |
43ff13b4 JM |
1321 | do_exec_cleanups (old_cleanups); |
1322 | normal_stop (); | |
c2d11a7d JM |
1323 | if (step_multi && stop_step) |
1324 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1325 | else | |
1326 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1327 | } |
1328 | } | |
1329 | ||
cd0fc7c3 SS |
1330 | /* Prepare an execution control state for looping through a |
1331 | wait_for_inferior-type loop. */ | |
1332 | ||
1333 | void | |
96baa820 | 1334 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1335 | { |
c2d11a7d | 1336 | /* ecs->another_trap? */ |
cd0fc7c3 SS |
1337 | ecs->random_signal = 0; |
1338 | ecs->remove_breakpoints_on_following_step = 0; | |
1339 | ecs->handling_longjmp = 0; /* FIXME */ | |
1340 | ecs->update_step_sp = 0; | |
1341 | ecs->stepping_through_solib_after_catch = 0; | |
1342 | ecs->stepping_through_solib_catchpoints = NULL; | |
1343 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1344 | ecs->stepping_through_sigtramp = 0; | |
1345 | ecs->sal = find_pc_line (prev_pc, 0); | |
1346 | ecs->current_line = ecs->sal.line; | |
1347 | ecs->current_symtab = ecs->sal.symtab; | |
1348 | ecs->infwait_state = infwait_normal_state; | |
39f77062 | 1349 | ecs->waiton_ptid = pid_to_ptid (-1); |
cd0fc7c3 SS |
1350 | ecs->wp = &(ecs->ws); |
1351 | } | |
1352 | ||
a0b3c4fd | 1353 | /* Call this function before setting step_resume_breakpoint, as a |
53a5351d JM |
1354 | sanity check. There should never be more than one step-resume |
1355 | breakpoint per thread, so we should never be setting a new | |
1356 | step_resume_breakpoint when one is already active. */ | |
a0b3c4fd | 1357 | static void |
96baa820 | 1358 | check_for_old_step_resume_breakpoint (void) |
a0b3c4fd JM |
1359 | { |
1360 | if (step_resume_breakpoint) | |
1361 | warning ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint"); | |
1362 | } | |
1363 | ||
e02bc4cc DS |
1364 | /* Return the cached copy of the last pid/waitstatus returned by |
1365 | target_wait()/target_wait_hook(). The data is actually cached by | |
1366 | handle_inferior_event(), which gets called immediately after | |
1367 | target_wait()/target_wait_hook(). */ | |
1368 | ||
1369 | void | |
39f77062 | 1370 | get_last_target_status(ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1371 | { |
39f77062 | 1372 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1373 | *status = target_last_waitstatus; |
1374 | } | |
1375 | ||
dd80620e MS |
1376 | /* Switch thread contexts, maintaining "infrun state". */ |
1377 | ||
1378 | static void | |
1379 | context_switch (struct execution_control_state *ecs) | |
1380 | { | |
1381 | /* Caution: it may happen that the new thread (or the old one!) | |
1382 | is not in the thread list. In this case we must not attempt | |
1383 | to "switch context", or we run the risk that our context may | |
1384 | be lost. This may happen as a result of the target module | |
1385 | mishandling thread creation. */ | |
1386 | ||
1387 | if (in_thread_list (inferior_ptid) && in_thread_list (ecs->ptid)) | |
1388 | { /* Perform infrun state context switch: */ | |
1389 | /* Save infrun state for the old thread. */ | |
1390 | save_infrun_state (inferior_ptid, prev_pc, | |
1391 | prev_func_start, prev_func_name, | |
1392 | trap_expected, step_resume_breakpoint, | |
1393 | through_sigtramp_breakpoint, step_range_start, | |
1394 | step_range_end, step_frame_address, | |
1395 | ecs->handling_longjmp, ecs->another_trap, | |
1396 | ecs->stepping_through_solib_after_catch, | |
1397 | ecs->stepping_through_solib_catchpoints, | |
1398 | ecs->stepping_through_sigtramp, | |
1399 | ecs->current_line, ecs->current_symtab, | |
1400 | step_sp); | |
1401 | ||
1402 | /* Load infrun state for the new thread. */ | |
1403 | load_infrun_state (ecs->ptid, &prev_pc, | |
1404 | &prev_func_start, &prev_func_name, | |
1405 | &trap_expected, &step_resume_breakpoint, | |
1406 | &through_sigtramp_breakpoint, &step_range_start, | |
1407 | &step_range_end, &step_frame_address, | |
1408 | &ecs->handling_longjmp, &ecs->another_trap, | |
1409 | &ecs->stepping_through_solib_after_catch, | |
1410 | &ecs->stepping_through_solib_catchpoints, | |
1411 | &ecs->stepping_through_sigtramp, | |
1412 | &ecs->current_line, &ecs->current_symtab, | |
1413 | &step_sp); | |
1414 | } | |
1415 | inferior_ptid = ecs->ptid; | |
1416 | } | |
1417 | ||
1418 | ||
cd0fc7c3 SS |
1419 | /* Given an execution control state that has been freshly filled in |
1420 | by an event from the inferior, figure out what it means and take | |
1421 | appropriate action. */ | |
c906108c | 1422 | |
cd0fc7c3 | 1423 | void |
96baa820 | 1424 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 SS |
1425 | { |
1426 | CORE_ADDR tmp; | |
1427 | int stepped_after_stopped_by_watchpoint; | |
1428 | ||
e02bc4cc | 1429 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1430 | target_last_wait_ptid = ecs->ptid; |
e02bc4cc DS |
1431 | target_last_waitstatus = *ecs->wp; |
1432 | ||
cd0fc7c3 SS |
1433 | /* Keep this extra brace for now, minimizes diffs. */ |
1434 | { | |
c5aa993b JM |
1435 | switch (ecs->infwait_state) |
1436 | { | |
dd80620e MS |
1437 | case infwait_thread_hop_state: |
1438 | /* Cancel the waiton_ptid. */ | |
1439 | ecs->waiton_ptid = pid_to_ptid (-1); | |
1440 | /* Fall thru to the normal_state case. */ | |
1441 | ||
c5aa993b | 1442 | case infwait_normal_state: |
c5aa993b JM |
1443 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event |
1444 | is serviced in this loop, below. */ | |
1445 | if (ecs->enable_hw_watchpoints_after_wait) | |
1446 | { | |
39f77062 | 1447 | TARGET_ENABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); |
c5aa993b JM |
1448 | ecs->enable_hw_watchpoints_after_wait = 0; |
1449 | } | |
1450 | stepped_after_stopped_by_watchpoint = 0; | |
1451 | break; | |
b83266a0 | 1452 | |
c5aa993b JM |
1453 | case infwait_nullified_state: |
1454 | break; | |
b83266a0 | 1455 | |
c5aa993b JM |
1456 | case infwait_nonstep_watch_state: |
1457 | insert_breakpoints (); | |
b83266a0 | 1458 | |
c5aa993b JM |
1459 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1460 | handle things like signals arriving and other things happening | |
1461 | in combination correctly? */ | |
1462 | stepped_after_stopped_by_watchpoint = 1; | |
1463 | break; | |
1464 | } | |
1465 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1466 | |
c5aa993b | 1467 | flush_cached_frames (); |
c906108c | 1468 | |
c5aa993b | 1469 | /* If it's a new process, add it to the thread database */ |
c906108c | 1470 | |
39f77062 KB |
1471 | ecs->new_thread_event = (! ptid_equal (ecs->ptid, inferior_ptid) |
1472 | && ! in_thread_list (ecs->ptid)); | |
c906108c | 1473 | |
c5aa993b JM |
1474 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
1475 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
1476 | && ecs->new_thread_event) | |
1477 | { | |
39f77062 | 1478 | add_thread (ecs->ptid); |
c906108c | 1479 | |
8b93c638 JM |
1480 | #ifdef UI_OUT |
1481 | ui_out_text (uiout, "[New "); | |
39f77062 | 1482 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->ptid)); |
8b93c638 JM |
1483 | ui_out_text (uiout, "]\n"); |
1484 | #else | |
39f77062 | 1485 | printf_filtered ("[New %s]\n", target_pid_or_tid_to_str (ecs->ptid)); |
8b93c638 | 1486 | #endif |
c906108c SS |
1487 | |
1488 | #if 0 | |
c5aa993b JM |
1489 | /* NOTE: This block is ONLY meant to be invoked in case of a |
1490 | "thread creation event"! If it is invoked for any other | |
1491 | sort of event (such as a new thread landing on a breakpoint), | |
1492 | the event will be discarded, which is almost certainly | |
1493 | a bad thing! | |
1494 | ||
1495 | To avoid this, the low-level module (eg. target_wait) | |
1496 | should call in_thread_list and add_thread, so that the | |
1497 | new thread is known by the time we get here. */ | |
1498 | ||
1499 | /* We may want to consider not doing a resume here in order | |
1500 | to give the user a chance to play with the new thread. | |
1501 | It might be good to make that a user-settable option. */ | |
1502 | ||
1503 | /* At this point, all threads are stopped (happens | |
1504 | automatically in either the OS or the native code). | |
1505 | Therefore we need to continue all threads in order to | |
1506 | make progress. */ | |
1507 | ||
39f77062 | 1508 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); |
104c1213 JM |
1509 | prepare_to_wait (ecs); |
1510 | return; | |
c906108c | 1511 | #endif |
c5aa993b | 1512 | } |
c906108c | 1513 | |
c5aa993b JM |
1514 | switch (ecs->ws.kind) |
1515 | { | |
1516 | case TARGET_WAITKIND_LOADED: | |
1517 | /* Ignore gracefully during startup of the inferior, as it | |
1518 | might be the shell which has just loaded some objects, | |
1519 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1520 | #ifdef SOLIB_ADD |
c5aa993b JM |
1521 | if (!stop_soon_quietly) |
1522 | { | |
1523 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1524 | breakpoint addresses via breakpoint_re_set. */ | |
1525 | if (breakpoints_inserted) | |
1526 | remove_breakpoints (); | |
c906108c | 1527 | |
c5aa993b JM |
1528 | /* Check for any newly added shared libraries if we're |
1529 | supposed to be adding them automatically. */ | |
1530 | if (auto_solib_add) | |
1531 | { | |
1532 | /* Switch terminal for any messages produced by | |
1533 | breakpoint_re_set. */ | |
1534 | target_terminal_ours_for_output (); | |
1535 | SOLIB_ADD (NULL, 0, NULL); | |
1536 | target_terminal_inferior (); | |
1537 | } | |
c906108c | 1538 | |
c5aa993b JM |
1539 | /* Reinsert breakpoints and continue. */ |
1540 | if (breakpoints_inserted) | |
1541 | insert_breakpoints (); | |
1542 | } | |
c906108c | 1543 | #endif |
c5aa993b | 1544 | resume (0, TARGET_SIGNAL_0); |
104c1213 JM |
1545 | prepare_to_wait (ecs); |
1546 | return; | |
c5aa993b JM |
1547 | |
1548 | case TARGET_WAITKIND_SPURIOUS: | |
1549 | resume (0, TARGET_SIGNAL_0); | |
104c1213 JM |
1550 | prepare_to_wait (ecs); |
1551 | return; | |
c5aa993b JM |
1552 | |
1553 | case TARGET_WAITKIND_EXITED: | |
1554 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
11cf8741 | 1555 | print_stop_reason (EXITED, ecs->ws.value.integer); |
c5aa993b JM |
1556 | |
1557 | /* Record the exit code in the convenience variable $_exitcode, so | |
1558 | that the user can inspect this again later. */ | |
1559 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1560 | value_from_longest (builtin_type_int, | |
1561 | (LONGEST) ecs->ws.value.integer)); | |
1562 | gdb_flush (gdb_stdout); | |
1563 | target_mourn_inferior (); | |
b0ed3589 | 1564 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ |
c5aa993b | 1565 | stop_print_frame = 0; |
104c1213 JM |
1566 | stop_stepping (ecs); |
1567 | return; | |
c5aa993b JM |
1568 | |
1569 | case TARGET_WAITKIND_SIGNALLED: | |
1570 | stop_print_frame = 0; | |
1571 | stop_signal = ecs->ws.value.sig; | |
1572 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1573 | |
c7e79b4b ND |
1574 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1575 | reach here unless the inferior is dead. However, for years | |
1576 | target_kill() was called here, which hints that fatal signals aren't | |
1577 | really fatal on some systems. If that's true, then some changes | |
1578 | may be needed. */ | |
1579 | target_mourn_inferior (); | |
c5aa993b | 1580 | |
11cf8741 | 1581 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
b0ed3589 | 1582 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ |
104c1213 JM |
1583 | stop_stepping (ecs); |
1584 | return; | |
c5aa993b JM |
1585 | |
1586 | /* The following are the only cases in which we keep going; | |
1587 | the above cases end in a continue or goto. */ | |
1588 | case TARGET_WAITKIND_FORKED: | |
1589 | stop_signal = TARGET_SIGNAL_TRAP; | |
1590 | pending_follow.kind = ecs->ws.kind; | |
1591 | ||
1592 | /* Ignore fork events reported for the parent; we're only | |
1593 | interested in reacting to forks of the child. Note that | |
1594 | we expect the child's fork event to be available if we | |
1595 | waited for it now. */ | |
39f77062 | 1596 | if (ptid_equal (inferior_ptid, ecs->ptid)) |
c5aa993b JM |
1597 | { |
1598 | pending_follow.fork_event.saw_parent_fork = 1; | |
39f77062 | 1599 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
c5aa993b | 1600 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; |
104c1213 JM |
1601 | prepare_to_wait (ecs); |
1602 | return; | |
c5aa993b JM |
1603 | } |
1604 | else | |
1605 | { | |
1606 | pending_follow.fork_event.saw_child_fork = 1; | |
39f77062 | 1607 | pending_follow.fork_event.child_pid = PIDGET (ecs->ptid); |
c5aa993b JM |
1608 | pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid; |
1609 | } | |
c906108c | 1610 | |
39f77062 KB |
1611 | stop_pc = read_pc_pid (ecs->ptid); |
1612 | ecs->saved_inferior_ptid = inferior_ptid; | |
1613 | inferior_ptid = ecs->ptid; | |
80b34fab MS |
1614 | /* The second argument of bpstat_stop_status is meant to help |
1615 | distinguish between a breakpoint trap and a singlestep trap. | |
1616 | This is only important on targets where DECR_PC_AFTER_BREAK | |
1617 | is non-zero. The prev_pc test is meant to distinguish between | |
1618 | singlestepping a trap instruction, and singlestepping thru a | |
1619 | jump to the instruction following a trap instruction. */ | |
1620 | ||
1621 | stop_bpstat = bpstat_stop_status (&stop_pc, | |
1622 | currently_stepping (ecs) && | |
1623 | prev_pc != | |
1624 | stop_pc - DECR_PC_AFTER_BREAK); | |
c5aa993b | 1625 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
39f77062 | 1626 | inferior_ptid = ecs->saved_inferior_ptid; |
c5aa993b JM |
1627 | goto process_event_stop_test; |
1628 | ||
1629 | /* If this a platform which doesn't allow a debugger to touch a | |
1630 | vfork'd inferior until after it exec's, then we'd best keep | |
1631 | our fingers entirely off the inferior, other than continuing | |
1632 | it. This has the unfortunate side-effect that catchpoints | |
1633 | of vforks will be ignored. But since the platform doesn't | |
1634 | allow the inferior be touched at vfork time, there's really | |
1635 | little choice. */ | |
1636 | case TARGET_WAITKIND_VFORKED: | |
1637 | stop_signal = TARGET_SIGNAL_TRAP; | |
1638 | pending_follow.kind = ecs->ws.kind; | |
1639 | ||
1640 | /* Is this a vfork of the parent? If so, then give any | |
1641 | vfork catchpoints a chance to trigger now. (It's | |
1642 | dangerous to do so if the child canot be touched until | |
1643 | it execs, and the child has not yet exec'd. We probably | |
1644 | should warn the user to that effect when the catchpoint | |
1645 | triggers...) */ | |
39f77062 | 1646 | if (ptid_equal (ecs->ptid, inferior_ptid)) |
c5aa993b JM |
1647 | { |
1648 | pending_follow.fork_event.saw_parent_fork = 1; | |
39f77062 | 1649 | pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid); |
c5aa993b JM |
1650 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; |
1651 | } | |
c906108c | 1652 | |
c5aa993b JM |
1653 | /* If we've seen the child's vfork event but cannot really touch |
1654 | the child until it execs, then we must continue the child now. | |
1655 | Else, give any vfork catchpoints a chance to trigger now. */ | |
1656 | else | |
1657 | { | |
1658 | pending_follow.fork_event.saw_child_fork = 1; | |
39f77062 | 1659 | pending_follow.fork_event.child_pid = PIDGET (ecs->ptid); |
c5aa993b | 1660 | pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid; |
39f77062 KB |
1661 | target_post_startup_inferior ( |
1662 | pid_to_ptid (pending_follow.fork_event.child_pid)); | |
c5aa993b JM |
1663 | follow_vfork_when_exec = !target_can_follow_vfork_prior_to_exec (); |
1664 | if (follow_vfork_when_exec) | |
1665 | { | |
39f77062 | 1666 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); |
104c1213 JM |
1667 | prepare_to_wait (ecs); |
1668 | return; | |
c5aa993b JM |
1669 | } |
1670 | } | |
c906108c | 1671 | |
c5aa993b | 1672 | stop_pc = read_pc (); |
80b34fab MS |
1673 | /* The second argument of bpstat_stop_status is meant to help |
1674 | distinguish between a breakpoint trap and a singlestep trap. | |
1675 | This is only important on targets where DECR_PC_AFTER_BREAK | |
1676 | is non-zero. The prev_pc test is meant to distinguish between | |
1677 | singlestepping a trap instruction, and singlestepping thru a | |
1678 | jump to the instruction following a trap instruction. */ | |
1679 | ||
1680 | stop_bpstat = bpstat_stop_status (&stop_pc, | |
1681 | currently_stepping (ecs) && | |
1682 | prev_pc != | |
1683 | stop_pc - DECR_PC_AFTER_BREAK); | |
c5aa993b JM |
1684 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1685 | goto process_event_stop_test; | |
1686 | ||
1687 | case TARGET_WAITKIND_EXECD: | |
1688 | stop_signal = TARGET_SIGNAL_TRAP; | |
1689 | ||
1690 | /* Is this a target which reports multiple exec events per actual | |
1691 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1692 | ignore all but the last one. Just resume the exec'r, and wait | |
1693 | for the next exec event. */ | |
1694 | if (inferior_ignoring_leading_exec_events) | |
1695 | { | |
1696 | inferior_ignoring_leading_exec_events--; | |
1697 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1698 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.parent_pid); | |
39f77062 | 1699 | target_resume (ecs->ptid, 0, TARGET_SIGNAL_0); |
104c1213 JM |
1700 | prepare_to_wait (ecs); |
1701 | return; | |
c5aa993b JM |
1702 | } |
1703 | inferior_ignoring_leading_exec_events = | |
1704 | target_reported_exec_events_per_exec_call () - 1; | |
c906108c | 1705 | |
96baa820 JM |
1706 | pending_follow.execd_pathname = |
1707 | savestring (ecs->ws.value.execd_pathname, | |
1708 | strlen (ecs->ws.value.execd_pathname)); | |
c906108c | 1709 | |
39f77062 | 1710 | /* Did inferior_ptid exec, or did a (possibly not-yet-followed) |
c5aa993b | 1711 | child of a vfork exec? |
c906108c | 1712 | |
c5aa993b JM |
1713 | ??rehrauer: This is unabashedly an HP-UX specific thing. On |
1714 | HP-UX, events associated with a vforking inferior come in | |
1715 | threes: a vfork event for the child (always first), followed | |
1716 | a vfork event for the parent and an exec event for the child. | |
1717 | The latter two can come in either order. | |
c906108c | 1718 | |
c5aa993b JM |
1719 | If we get the parent vfork event first, life's good: We follow |
1720 | either the parent or child, and then the child's exec event is | |
1721 | a "don't care". | |
c906108c | 1722 | |
c5aa993b JM |
1723 | But if we get the child's exec event first, then we delay |
1724 | responding to it until we handle the parent's vfork. Because, | |
1725 | otherwise we can't satisfy a "catch vfork". */ | |
1726 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1727 | { | |
1728 | pending_follow.fork_event.saw_child_exec = 1; | |
1729 | ||
1730 | /* On some targets, the child must be resumed before | |
1731 | the parent vfork event is delivered. A single-step | |
1732 | suffices. */ | |
1733 | if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ()) | |
39f77062 | 1734 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
c5aa993b | 1735 | /* We expect the parent vfork event to be available now. */ |
104c1213 JM |
1736 | prepare_to_wait (ecs); |
1737 | return; | |
c5aa993b | 1738 | } |
c906108c | 1739 | |
c5aa993b JM |
1740 | /* This causes the eventpoints and symbol table to be reset. Must |
1741 | do this now, before trying to determine whether to stop. */ | |
39f77062 | 1742 | follow_exec (PIDGET (inferior_ptid), pending_follow.execd_pathname); |
b8c9b27d | 1743 | xfree (pending_follow.execd_pathname); |
c5aa993b | 1744 | |
39f77062 KB |
1745 | stop_pc = read_pc_pid (ecs->ptid); |
1746 | ecs->saved_inferior_ptid = inferior_ptid; | |
1747 | inferior_ptid = ecs->ptid; | |
80b34fab MS |
1748 | /* The second argument of bpstat_stop_status is meant to help |
1749 | distinguish between a breakpoint trap and a singlestep trap. | |
1750 | This is only important on targets where DECR_PC_AFTER_BREAK | |
1751 | is non-zero. The prev_pc test is meant to distinguish between | |
1752 | singlestepping a trap instruction, and singlestepping thru a | |
1753 | jump to the instruction following a trap instruction. */ | |
1754 | ||
1755 | stop_bpstat = bpstat_stop_status (&stop_pc, | |
1756 | currently_stepping (ecs) && | |
1757 | prev_pc != | |
1758 | stop_pc - DECR_PC_AFTER_BREAK); | |
c5aa993b | 1759 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
39f77062 | 1760 | inferior_ptid = ecs->saved_inferior_ptid; |
c5aa993b JM |
1761 | goto process_event_stop_test; |
1762 | ||
1763 | /* These syscall events are returned on HP-UX, as part of its | |
1764 | implementation of page-protection-based "hardware" watchpoints. | |
1765 | HP-UX has unfortunate interactions between page-protections and | |
1766 | some system calls. Our solution is to disable hardware watches | |
1767 | when a system call is entered, and reenable them when the syscall | |
1768 | completes. The downside of this is that we may miss the precise | |
1769 | point at which a watched piece of memory is modified. "Oh well." | |
1770 | ||
1771 | Note that we may have multiple threads running, which may each | |
1772 | enter syscalls at roughly the same time. Since we don't have a | |
1773 | good notion currently of whether a watched piece of memory is | |
1774 | thread-private, we'd best not have any page-protections active | |
1775 | when any thread is in a syscall. Thus, we only want to reenable | |
1776 | hardware watches when no threads are in a syscall. | |
1777 | ||
1778 | Also, be careful not to try to gather much state about a thread | |
1779 | that's in a syscall. It's frequently a losing proposition. */ | |
1780 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
1781 | number_of_threads_in_syscalls++; | |
1782 | if (number_of_threads_in_syscalls == 1) | |
1783 | { | |
39f77062 | 1784 | TARGET_DISABLE_HW_WATCHPOINTS (PIDGET (inferior_ptid)); |
c5aa993b JM |
1785 | } |
1786 | resume (0, TARGET_SIGNAL_0); | |
104c1213 JM |
1787 | prepare_to_wait (ecs); |
1788 | return; | |
c906108c | 1789 | |
c5aa993b | 1790 | /* Before examining the threads further, step this thread to |
c906108c SS |
1791 | get it entirely out of the syscall. (We get notice of the |
1792 | event when the thread is just on the verge of exiting a | |
1793 | syscall. Stepping one instruction seems to get it back | |
1794 | into user code.) | |
1795 | ||
1796 | Note that although the logical place to reenable h/w watches | |
1797 | is here, we cannot. We cannot reenable them before stepping | |
1798 | the thread (this causes the next wait on the thread to hang). | |
1799 | ||
1800 | Nor can we enable them after stepping until we've done a wait. | |
cd0fc7c3 | 1801 | Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait |
c906108c SS |
1802 | here, which will be serviced immediately after the target |
1803 | is waited on. */ | |
c5aa993b | 1804 | case TARGET_WAITKIND_SYSCALL_RETURN: |
39f77062 | 1805 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
c906108c | 1806 | |
c5aa993b JM |
1807 | if (number_of_threads_in_syscalls > 0) |
1808 | { | |
1809 | number_of_threads_in_syscalls--; | |
1810 | ecs->enable_hw_watchpoints_after_wait = | |
1811 | (number_of_threads_in_syscalls == 0); | |
1812 | } | |
104c1213 JM |
1813 | prepare_to_wait (ecs); |
1814 | return; | |
c906108c | 1815 | |
c5aa993b JM |
1816 | case TARGET_WAITKIND_STOPPED: |
1817 | stop_signal = ecs->ws.value.sig; | |
1818 | break; | |
c4093a6a JM |
1819 | |
1820 | /* We had an event in the inferior, but we are not interested | |
1821 | in handling it at this level. The lower layers have already | |
1822 | done what needs to be done, if anything. This case can | |
1823 | occur only when the target is async or extended-async. One | |
1824 | of the circumstamces for this to happen is when the | |
1825 | inferior produces output for the console. The inferior has | |
1826 | not stopped, and we are ignoring the event. */ | |
1827 | case TARGET_WAITKIND_IGNORE: | |
1828 | ecs->wait_some_more = 1; | |
1829 | return; | |
c5aa993b | 1830 | } |
c906108c | 1831 | |
c5aa993b JM |
1832 | /* We may want to consider not doing a resume here in order to give |
1833 | the user a chance to play with the new thread. It might be good | |
1834 | to make that a user-settable option. */ | |
c906108c | 1835 | |
c5aa993b JM |
1836 | /* At this point, all threads are stopped (happens automatically in |
1837 | either the OS or the native code). Therefore we need to continue | |
1838 | all threads in order to make progress. */ | |
1839 | if (ecs->new_thread_event) | |
1840 | { | |
39f77062 | 1841 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); |
104c1213 JM |
1842 | prepare_to_wait (ecs); |
1843 | return; | |
c5aa993b | 1844 | } |
c906108c | 1845 | |
39f77062 | 1846 | stop_pc = read_pc_pid (ecs->ptid); |
c906108c | 1847 | |
c5aa993b JM |
1848 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1849 | another thread. If so, then step that thread past the breakpoint, | |
1850 | and continue it. */ | |
c906108c | 1851 | |
c5aa993b JM |
1852 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1853 | { | |
b0ed3589 | 1854 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
c5aa993b JM |
1855 | ecs->random_signal = 0; |
1856 | else if (breakpoints_inserted | |
1857 | && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK)) | |
1858 | { | |
cd0fc7c3 | 1859 | ecs->random_signal = 0; |
c5aa993b | 1860 | if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, |
39f77062 | 1861 | ecs->ptid)) |
c5aa993b JM |
1862 | { |
1863 | int remove_status; | |
1864 | ||
1865 | /* Saw a breakpoint, but it was hit by the wrong thread. | |
1866 | Just continue. */ | |
80b34fab MS |
1867 | if (DECR_PC_AFTER_BREAK) |
1868 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, ecs->ptid); | |
c5aa993b JM |
1869 | |
1870 | remove_status = remove_breakpoints (); | |
1871 | /* Did we fail to remove breakpoints? If so, try | |
1872 | to set the PC past the bp. (There's at least | |
1873 | one situation in which we can fail to remove | |
1874 | the bp's: On HP-UX's that use ttrace, we can't | |
1875 | change the address space of a vforking child | |
1876 | process until the child exits (well, okay, not | |
1877 | then either :-) or execs. */ | |
1878 | if (remove_status != 0) | |
1879 | { | |
80b34fab MS |
1880 | /* FIXME! This is obviously non-portable! */ |
1881 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, | |
1882 | ecs->ptid); | |
c6ad9598 MS |
1883 | /* We need to restart all the threads now, |
1884 | * unles we're running in scheduler-locked mode. | |
1885 | * Use currently_stepping to determine whether to | |
1886 | * step or continue. | |
1887 | */ | |
dd80620e | 1888 | /* FIXME MVS: is there any reason not to call resume()? */ |
c6ad9598 MS |
1889 | if (scheduler_mode == schedlock_on) |
1890 | target_resume (ecs->ptid, | |
1891 | currently_stepping (ecs), | |
1892 | TARGET_SIGNAL_0); | |
1893 | else | |
1894 | target_resume (RESUME_ALL, | |
1895 | currently_stepping (ecs), | |
1896 | TARGET_SIGNAL_0); | |
1897 | prepare_to_wait (ecs); | |
1898 | return; | |
c5aa993b JM |
1899 | } |
1900 | else | |
1901 | { /* Single step */ | |
dd80620e MS |
1902 | breakpoints_inserted = 0; |
1903 | if (!ptid_equal (inferior_ptid, ecs->ptid)) | |
1904 | context_switch (ecs); | |
39f77062 | 1905 | ecs->waiton_ptid = ecs->ptid; |
c5aa993b | 1906 | ecs->wp = &(ecs->ws); |
dd80620e MS |
1907 | ecs->another_trap = 1; |
1908 | ||
c5aa993b | 1909 | ecs->infwait_state = infwait_thread_hop_state; |
dd80620e MS |
1910 | keep_going (ecs); |
1911 | registers_changed (); | |
104c1213 | 1912 | return; |
c5aa993b | 1913 | } |
c5aa993b | 1914 | } |
c5aa993b JM |
1915 | } |
1916 | } | |
1917 | else | |
1918 | ecs->random_signal = 1; | |
1919 | ||
1920 | /* See if something interesting happened to the non-current thread. If | |
1921 | so, then switch to that thread, and eventually give control back to | |
1922 | the user. | |
1923 | ||
1924 | Note that if there's any kind of pending follow (i.e., of a fork, | |
1925 | vfork or exec), we don't want to do this now. Rather, we'll let | |
1926 | the next resume handle it. */ | |
39f77062 | 1927 | if (! ptid_equal (ecs->ptid, inferior_ptid) && |
c5aa993b JM |
1928 | (pending_follow.kind == TARGET_WAITKIND_SPURIOUS)) |
1929 | { | |
1930 | int printed = 0; | |
c906108c | 1931 | |
c5aa993b JM |
1932 | /* If it's a random signal for a non-current thread, notify user |
1933 | if he's expressed an interest. */ | |
1934 | if (ecs->random_signal | |
1935 | && signal_print[stop_signal]) | |
1936 | { | |
c906108c SS |
1937 | /* ??rehrauer: I don't understand the rationale for this code. If the |
1938 | inferior will stop as a result of this signal, then the act of handling | |
1939 | the stop ought to print a message that's couches the stoppage in user | |
1940 | terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior | |
1941 | won't stop as a result of the signal -- i.e., if the signal is merely | |
1942 | a side-effect of something GDB's doing "under the covers" for the | |
1943 | user, such as stepping threads over a breakpoint they shouldn't stop | |
1944 | for -- then the message seems to be a serious annoyance at best. | |
1945 | ||
1946 | For now, remove the message altogether. */ | |
1947 | #if 0 | |
c5aa993b JM |
1948 | printed = 1; |
1949 | target_terminal_ours_for_output (); | |
1950 | printf_filtered ("\nProgram received signal %s, %s.\n", | |
1951 | target_signal_to_name (stop_signal), | |
1952 | target_signal_to_string (stop_signal)); | |
1953 | gdb_flush (gdb_stdout); | |
c906108c | 1954 | #endif |
c5aa993b | 1955 | } |
c906108c | 1956 | |
c5aa993b JM |
1957 | /* If it's not SIGTRAP and not a signal we want to stop for, then |
1958 | continue the thread. */ | |
c906108c | 1959 | |
c5aa993b JM |
1960 | if (stop_signal != TARGET_SIGNAL_TRAP |
1961 | && !signal_stop[stop_signal]) | |
1962 | { | |
1963 | if (printed) | |
1964 | target_terminal_inferior (); | |
c906108c | 1965 | |
c5aa993b JM |
1966 | /* Clear the signal if it should not be passed. */ |
1967 | if (signal_program[stop_signal] == 0) | |
1968 | stop_signal = TARGET_SIGNAL_0; | |
c906108c | 1969 | |
39f77062 | 1970 | target_resume (ecs->ptid, 0, stop_signal); |
104c1213 JM |
1971 | prepare_to_wait (ecs); |
1972 | return; | |
c5aa993b | 1973 | } |
c906108c | 1974 | |
c5aa993b JM |
1975 | /* It's a SIGTRAP or a signal we're interested in. Switch threads, |
1976 | and fall into the rest of wait_for_inferior(). */ | |
1977 | ||
dd80620e | 1978 | context_switch (ecs); |
c5aa993b | 1979 | |
c5aa993b | 1980 | if (context_hook) |
39f77062 | 1981 | context_hook (pid_to_thread_id (ecs->ptid)); |
c5aa993b | 1982 | |
c5aa993b JM |
1983 | flush_cached_frames (); |
1984 | } | |
c906108c | 1985 | |
b0ed3589 | 1986 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
c5aa993b JM |
1987 | { |
1988 | /* Pull the single step breakpoints out of the target. */ | |
1989 | SOFTWARE_SINGLE_STEP (0, 0); | |
1990 | singlestep_breakpoints_inserted_p = 0; | |
1991 | } | |
c906108c | 1992 | |
c5aa993b JM |
1993 | /* If PC is pointing at a nullified instruction, then step beyond |
1994 | it so that the user won't be confused when GDB appears to be ready | |
1995 | to execute it. */ | |
c906108c | 1996 | |
c5aa993b JM |
1997 | /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */ |
1998 | if (INSTRUCTION_NULLIFIED) | |
1999 | { | |
2000 | registers_changed (); | |
39f77062 | 2001 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
c906108c | 2002 | |
c5aa993b JM |
2003 | /* We may have received a signal that we want to pass to |
2004 | the inferior; therefore, we must not clobber the waitstatus | |
2005 | in WS. */ | |
c906108c | 2006 | |
c5aa993b | 2007 | ecs->infwait_state = infwait_nullified_state; |
39f77062 | 2008 | ecs->waiton_ptid = ecs->ptid; |
c5aa993b | 2009 | ecs->wp = &(ecs->tmpstatus); |
104c1213 JM |
2010 | prepare_to_wait (ecs); |
2011 | return; | |
c5aa993b | 2012 | } |
c906108c | 2013 | |
c5aa993b JM |
2014 | /* It may not be necessary to disable the watchpoint to stop over |
2015 | it. For example, the PA can (with some kernel cooperation) | |
2016 | single step over a watchpoint without disabling the watchpoint. */ | |
2017 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
2018 | { | |
2019 | resume (1, 0); | |
104c1213 JM |
2020 | prepare_to_wait (ecs); |
2021 | return; | |
c5aa993b | 2022 | } |
c906108c | 2023 | |
c5aa993b JM |
2024 | /* It is far more common to need to disable a watchpoint to step |
2025 | the inferior over it. FIXME. What else might a debug | |
2026 | register or page protection watchpoint scheme need here? */ | |
2027 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
2028 | { | |
2029 | /* At this point, we are stopped at an instruction which has | |
2030 | attempted to write to a piece of memory under control of | |
2031 | a watchpoint. The instruction hasn't actually executed | |
2032 | yet. If we were to evaluate the watchpoint expression | |
2033 | now, we would get the old value, and therefore no change | |
2034 | would seem to have occurred. | |
2035 | ||
2036 | In order to make watchpoints work `right', we really need | |
2037 | to complete the memory write, and then evaluate the | |
2038 | watchpoint expression. The following code does that by | |
2039 | removing the watchpoint (actually, all watchpoints and | |
2040 | breakpoints), single-stepping the target, re-inserting | |
2041 | watchpoints, and then falling through to let normal | |
2042 | single-step processing handle proceed. Since this | |
2043 | includes evaluating watchpoints, things will come to a | |
2044 | stop in the correct manner. */ | |
2045 | ||
80b34fab MS |
2046 | if (DECR_PC_AFTER_BREAK) |
2047 | write_pc (stop_pc - DECR_PC_AFTER_BREAK); | |
c5aa993b JM |
2048 | |
2049 | remove_breakpoints (); | |
2050 | registers_changed (); | |
39f77062 | 2051 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ |
c5aa993b | 2052 | |
39f77062 | 2053 | ecs->waiton_ptid = ecs->ptid; |
c5aa993b JM |
2054 | ecs->wp = &(ecs->ws); |
2055 | ecs->infwait_state = infwait_nonstep_watch_state; | |
104c1213 JM |
2056 | prepare_to_wait (ecs); |
2057 | return; | |
c5aa993b | 2058 | } |
c906108c | 2059 | |
c5aa993b JM |
2060 | /* It may be possible to simply continue after a watchpoint. */ |
2061 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
2062 | STOPPED_BY_WATCHPOINT (ecs->ws); | |
2063 | ||
2064 | ecs->stop_func_start = 0; | |
2065 | ecs->stop_func_end = 0; | |
2066 | ecs->stop_func_name = 0; | |
2067 | /* Don't care about return value; stop_func_start and stop_func_name | |
2068 | will both be 0 if it doesn't work. */ | |
2069 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
2070 | &ecs->stop_func_start, &ecs->stop_func_end); | |
2071 | ecs->stop_func_start += FUNCTION_START_OFFSET; | |
2072 | ecs->another_trap = 0; | |
2073 | bpstat_clear (&stop_bpstat); | |
2074 | stop_step = 0; | |
2075 | stop_stack_dummy = 0; | |
2076 | stop_print_frame = 1; | |
2077 | ecs->random_signal = 0; | |
2078 | stopped_by_random_signal = 0; | |
2079 | breakpoints_failed = 0; | |
2080 | ||
2081 | /* Look at the cause of the stop, and decide what to do. | |
2082 | The alternatives are: | |
2083 | 1) break; to really stop and return to the debugger, | |
2084 | 2) drop through to start up again | |
2085 | (set ecs->another_trap to 1 to single step once) | |
2086 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
2087 | will be made according to the signal handling tables. */ | |
2088 | ||
2089 | /* First, distinguish signals caused by the debugger from signals | |
2090 | that have to do with the program's own actions. | |
2091 | Note that breakpoint insns may cause SIGTRAP or SIGILL | |
2092 | or SIGEMT, depending on the operating system version. | |
2093 | Here we detect when a SIGILL or SIGEMT is really a breakpoint | |
2094 | and change it to SIGTRAP. */ | |
2095 | ||
2096 | if (stop_signal == TARGET_SIGNAL_TRAP | |
2097 | || (breakpoints_inserted && | |
2098 | (stop_signal == TARGET_SIGNAL_ILL | |
2099 | || stop_signal == TARGET_SIGNAL_EMT | |
2100 | )) | |
2101 | || stop_soon_quietly) | |
2102 | { | |
2103 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
2104 | { | |
2105 | stop_print_frame = 0; | |
104c1213 JM |
2106 | stop_stepping (ecs); |
2107 | return; | |
c5aa993b JM |
2108 | } |
2109 | if (stop_soon_quietly) | |
104c1213 JM |
2110 | { |
2111 | stop_stepping (ecs); | |
2112 | return; | |
2113 | } | |
c906108c | 2114 | |
c5aa993b JM |
2115 | /* Don't even think about breakpoints |
2116 | if just proceeded over a breakpoint. | |
c906108c | 2117 | |
c5aa993b JM |
2118 | However, if we are trying to proceed over a breakpoint |
2119 | and end up in sigtramp, then through_sigtramp_breakpoint | |
2120 | will be set and we should check whether we've hit the | |
2121 | step breakpoint. */ | |
2122 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected | |
2123 | && through_sigtramp_breakpoint == NULL) | |
2124 | bpstat_clear (&stop_bpstat); | |
2125 | else | |
2126 | { | |
2127 | /* See if there is a breakpoint at the current PC. */ | |
80b34fab MS |
2128 | |
2129 | /* The second argument of bpstat_stop_status is meant to help | |
2130 | distinguish between a breakpoint trap and a singlestep trap. | |
2131 | This is only important on targets where DECR_PC_AFTER_BREAK | |
2132 | is non-zero. The prev_pc test is meant to distinguish between | |
2133 | singlestepping a trap instruction, and singlestepping thru a | |
2134 | jump to the instruction following a trap instruction. */ | |
2135 | ||
c5aa993b JM |
2136 | stop_bpstat = bpstat_stop_status |
2137 | (&stop_pc, | |
6426a772 JM |
2138 | /* Pass TRUE if our reason for stopping is something other |
2139 | than hitting a breakpoint. We do this by checking that | |
2140 | 1) stepping is going on and 2) we didn't hit a breakpoint | |
2141 | in a signal handler without an intervening stop in | |
2142 | sigtramp, which is detected by a new stack pointer value | |
2143 | below any usual function calling stack adjustments. */ | |
c5aa993b | 2144 | (currently_stepping (ecs) |
80b34fab | 2145 | && prev_pc != stop_pc - DECR_PC_AFTER_BREAK |
c5aa993b | 2146 | && !(step_range_end |
6426a772 | 2147 | && INNER_THAN (read_sp (), (step_sp - 16)))) |
c5aa993b JM |
2148 | ); |
2149 | /* Following in case break condition called a | |
2150 | function. */ | |
2151 | stop_print_frame = 1; | |
2152 | } | |
c906108c | 2153 | |
c5aa993b JM |
2154 | if (stop_signal == TARGET_SIGNAL_TRAP) |
2155 | ecs->random_signal | |
2156 | = !(bpstat_explains_signal (stop_bpstat) | |
2157 | || trap_expected | |
2158 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P | |
2159 | && PC_IN_CALL_DUMMY (stop_pc, read_sp (), | |
2160 | FRAME_FP (get_current_frame ()))) | |
2161 | || (step_range_end && step_resume_breakpoint == NULL)); | |
2162 | ||
2163 | else | |
2164 | { | |
cd0fc7c3 | 2165 | ecs->random_signal |
c906108c | 2166 | = !(bpstat_explains_signal (stop_bpstat) |
c5aa993b JM |
2167 | /* End of a stack dummy. Some systems (e.g. Sony |
2168 | news) give another signal besides SIGTRAP, so | |
2169 | check here as well as above. */ | |
7a292a7a SS |
2170 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P |
2171 | && PC_IN_CALL_DUMMY (stop_pc, read_sp (), | |
2172 | FRAME_FP (get_current_frame ()))) | |
c5aa993b JM |
2173 | ); |
2174 | if (!ecs->random_signal) | |
2175 | stop_signal = TARGET_SIGNAL_TRAP; | |
2176 | } | |
2177 | } | |
c906108c | 2178 | |
c5aa993b JM |
2179 | /* When we reach this point, we've pretty much decided |
2180 | that the reason for stopping must've been a random | |
2181 | (unexpected) signal. */ | |
2182 | ||
2183 | else | |
2184 | ecs->random_signal = 1; | |
2185 | /* If a fork, vfork or exec event was seen, then there are two | |
2186 | possible responses we can make: | |
2187 | ||
2188 | 1. If a catchpoint triggers for the event (ecs->random_signal == 0), | |
2189 | then we must stop now and issue a prompt. We will resume | |
2190 | the inferior when the user tells us to. | |
2191 | 2. If no catchpoint triggers for the event (ecs->random_signal == 1), | |
2192 | then we must resume the inferior now and keep checking. | |
2193 | ||
2194 | In either case, we must take appropriate steps to "follow" the | |
2195 | the fork/vfork/exec when the inferior is resumed. For example, | |
2196 | if follow-fork-mode is "child", then we must detach from the | |
2197 | parent inferior and follow the new child inferior. | |
2198 | ||
2199 | In either case, setting pending_follow causes the next resume() | |
2200 | to take the appropriate following action. */ | |
2201 | process_event_stop_test: | |
2202 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
2203 | { | |
2204 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
2205 | { | |
2206 | trap_expected = 1; | |
2207 | stop_signal = TARGET_SIGNAL_0; | |
d4f3574e SS |
2208 | keep_going (ecs); |
2209 | return; | |
c5aa993b JM |
2210 | } |
2211 | } | |
2212 | else if (ecs->ws.kind == TARGET_WAITKIND_VFORKED) | |
2213 | { | |
2214 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
2215 | { | |
d4f3574e SS |
2216 | stop_signal = TARGET_SIGNAL_0; |
2217 | keep_going (ecs); | |
2218 | return; | |
c5aa993b JM |
2219 | } |
2220 | } | |
2221 | else if (ecs->ws.kind == TARGET_WAITKIND_EXECD) | |
2222 | { | |
2223 | pending_follow.kind = ecs->ws.kind; | |
2224 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
2225 | { | |
2226 | trap_expected = 1; | |
2227 | stop_signal = TARGET_SIGNAL_0; | |
d4f3574e SS |
2228 | keep_going (ecs); |
2229 | return; | |
c5aa993b JM |
2230 | } |
2231 | } | |
c906108c | 2232 | |
c5aa993b JM |
2233 | /* For the program's own signals, act according to |
2234 | the signal handling tables. */ | |
c906108c | 2235 | |
c5aa993b JM |
2236 | if (ecs->random_signal) |
2237 | { | |
2238 | /* Signal not for debugging purposes. */ | |
2239 | int printed = 0; | |
2240 | ||
2241 | stopped_by_random_signal = 1; | |
2242 | ||
2243 | if (signal_print[stop_signal]) | |
2244 | { | |
2245 | printed = 1; | |
2246 | target_terminal_ours_for_output (); | |
11cf8741 | 2247 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); |
c5aa993b JM |
2248 | } |
2249 | if (signal_stop[stop_signal]) | |
104c1213 JM |
2250 | { |
2251 | stop_stepping (ecs); | |
2252 | return; | |
2253 | } | |
c5aa993b JM |
2254 | /* If not going to stop, give terminal back |
2255 | if we took it away. */ | |
2256 | else if (printed) | |
2257 | target_terminal_inferior (); | |
2258 | ||
2259 | /* Clear the signal if it should not be passed. */ | |
2260 | if (signal_program[stop_signal] == 0) | |
2261 | stop_signal = TARGET_SIGNAL_0; | |
2262 | ||
a0b3c4fd JM |
2263 | /* I'm not sure whether this needs to be check_sigtramp2 or |
2264 | whether it could/should be keep_going. | |
2265 | ||
2266 | This used to jump to step_over_function if we are stepping, | |
2267 | which is wrong. | |
2268 | ||
2269 | Suppose the user does a `next' over a function call, and while | |
2270 | that call is in progress, the inferior receives a signal for | |
2271 | which GDB does not stop (i.e., signal_stop[SIG] is false). In | |
2272 | that case, when we reach this point, there is already a | |
2273 | step-resume breakpoint established, right where it should be: | |
2274 | immediately after the function call the user is "next"-ing | |
d4f3574e | 2275 | over. If we call step_over_function now, two bad things |
a0b3c4fd JM |
2276 | happen: |
2277 | ||
2278 | - we'll create a new breakpoint, at wherever the current | |
2279 | frame's return address happens to be. That could be | |
2280 | anywhere, depending on what function call happens to be on | |
2281 | the top of the stack at that point. Point is, it's probably | |
2282 | not where we need it. | |
2283 | ||
2284 | - the existing step-resume breakpoint (which is at the correct | |
2285 | address) will get orphaned: step_resume_breakpoint will point | |
2286 | to the new breakpoint, and the old step-resume breakpoint | |
2287 | will never be cleaned up. | |
2288 | ||
2289 | The old behavior was meant to help HP-UX single-step out of | |
2290 | sigtramps. It would place the new breakpoint at prev_pc, which | |
2291 | was certainly wrong. I don't know the details there, so fixing | |
2292 | this probably breaks that. As with anything else, it's up to | |
2293 | the HP-UX maintainer to furnish a fix that doesn't break other | |
2294 | platforms. --JimB, 20 May 1999 */ | |
104c1213 | 2295 | check_sigtramp2 (ecs); |
e441088d MK |
2296 | keep_going (ecs); |
2297 | return; | |
c5aa993b JM |
2298 | } |
2299 | ||
2300 | /* Handle cases caused by hitting a breakpoint. */ | |
2301 | { | |
2302 | CORE_ADDR jmp_buf_pc; | |
2303 | struct bpstat_what what; | |
2304 | ||
2305 | what = bpstat_what (stop_bpstat); | |
2306 | ||
2307 | if (what.call_dummy) | |
c906108c | 2308 | { |
c5aa993b JM |
2309 | stop_stack_dummy = 1; |
2310 | #ifdef HP_OS_BUG | |
2311 | trap_expected_after_continue = 1; | |
2312 | #endif | |
c906108c | 2313 | } |
c5aa993b JM |
2314 | |
2315 | switch (what.main_action) | |
c906108c | 2316 | { |
c5aa993b JM |
2317 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2318 | /* If we hit the breakpoint at longjmp, disable it for the | |
2319 | duration of this command. Then, install a temporary | |
2320 | breakpoint at the target of the jmp_buf. */ | |
2321 | disable_longjmp_breakpoint (); | |
2322 | remove_breakpoints (); | |
2323 | breakpoints_inserted = 0; | |
2324 | if (!GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
d4f3574e SS |
2325 | { |
2326 | keep_going (ecs); | |
2327 | return; | |
2328 | } | |
c5aa993b JM |
2329 | |
2330 | /* Need to blow away step-resume breakpoint, as it | |
2331 | interferes with us */ | |
2332 | if (step_resume_breakpoint != NULL) | |
c906108c | 2333 | { |
8601f500 | 2334 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
c906108c | 2335 | } |
c5aa993b JM |
2336 | /* Not sure whether we need to blow this away too, but probably |
2337 | it is like the step-resume breakpoint. */ | |
2338 | if (through_sigtramp_breakpoint != NULL) | |
c906108c | 2339 | { |
c5aa993b JM |
2340 | delete_breakpoint (through_sigtramp_breakpoint); |
2341 | through_sigtramp_breakpoint = NULL; | |
c906108c | 2342 | } |
c906108c | 2343 | |
c5aa993b JM |
2344 | #if 0 |
2345 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2346 | if (step_over_calls > 0) | |
2347 | set_longjmp_resume_breakpoint (jmp_buf_pc, | |
2348 | get_current_frame ()); | |
2349 | else | |
2350 | #endif /* 0 */ | |
2351 | set_longjmp_resume_breakpoint (jmp_buf_pc, NULL); | |
2352 | ecs->handling_longjmp = 1; /* FIXME */ | |
d4f3574e SS |
2353 | keep_going (ecs); |
2354 | return; | |
c906108c | 2355 | |
c5aa993b JM |
2356 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2357 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
2358 | remove_breakpoints (); | |
2359 | breakpoints_inserted = 0; | |
2360 | #if 0 | |
2361 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2362 | if (step_over_calls | |
2363 | && (INNER_THAN (FRAME_FP (get_current_frame ()), | |
2364 | step_frame_address))) | |
2365 | { | |
2366 | ecs->another_trap = 1; | |
d4f3574e SS |
2367 | keep_going (ecs); |
2368 | return; | |
c5aa993b JM |
2369 | } |
2370 | #endif /* 0 */ | |
2371 | disable_longjmp_breakpoint (); | |
2372 | ecs->handling_longjmp = 0; /* FIXME */ | |
2373 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2374 | break; | |
2375 | /* else fallthrough */ | |
c906108c | 2376 | |
c5aa993b JM |
2377 | case BPSTAT_WHAT_SINGLE: |
2378 | if (breakpoints_inserted) | |
c906108c | 2379 | { |
c5aa993b | 2380 | remove_breakpoints (); |
c906108c | 2381 | } |
c5aa993b JM |
2382 | breakpoints_inserted = 0; |
2383 | ecs->another_trap = 1; | |
2384 | /* Still need to check other stuff, at least the case | |
2385 | where we are stepping and step out of the right range. */ | |
2386 | break; | |
c906108c | 2387 | |
c5aa993b JM |
2388 | case BPSTAT_WHAT_STOP_NOISY: |
2389 | stop_print_frame = 1; | |
c906108c | 2390 | |
c5aa993b JM |
2391 | /* We are about to nuke the step_resume_breakpoint and |
2392 | through_sigtramp_breakpoint via the cleanup chain, so | |
2393 | no need to worry about it here. */ | |
c906108c | 2394 | |
104c1213 JM |
2395 | stop_stepping (ecs); |
2396 | return; | |
c906108c | 2397 | |
c5aa993b JM |
2398 | case BPSTAT_WHAT_STOP_SILENT: |
2399 | stop_print_frame = 0; | |
c906108c | 2400 | |
c5aa993b JM |
2401 | /* We are about to nuke the step_resume_breakpoint and |
2402 | through_sigtramp_breakpoint via the cleanup chain, so | |
2403 | no need to worry about it here. */ | |
c906108c | 2404 | |
104c1213 JM |
2405 | stop_stepping (ecs); |
2406 | return; | |
c906108c | 2407 | |
c5aa993b JM |
2408 | case BPSTAT_WHAT_STEP_RESUME: |
2409 | /* This proably demands a more elegant solution, but, yeah | |
2410 | right... | |
2411 | ||
2412 | This function's use of the simple variable | |
2413 | step_resume_breakpoint doesn't seem to accomodate | |
2414 | simultaneously active step-resume bp's, although the | |
2415 | breakpoint list certainly can. | |
2416 | ||
2417 | If we reach here and step_resume_breakpoint is already | |
2418 | NULL, then apparently we have multiple active | |
2419 | step-resume bp's. We'll just delete the breakpoint we | |
53a5351d JM |
2420 | stopped at, and carry on. |
2421 | ||
2422 | Correction: what the code currently does is delete a | |
2423 | step-resume bp, but it makes no effort to ensure that | |
2424 | the one deleted is the one currently stopped at. MVS */ | |
2425 | ||
c5aa993b JM |
2426 | if (step_resume_breakpoint == NULL) |
2427 | { | |
2428 | step_resume_breakpoint = | |
2429 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2430 | } | |
8601f500 | 2431 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
c5aa993b JM |
2432 | break; |
2433 | ||
2434 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
2435 | if (through_sigtramp_breakpoint) | |
2436 | delete_breakpoint (through_sigtramp_breakpoint); | |
2437 | through_sigtramp_breakpoint = NULL; | |
2438 | ||
2439 | /* If were waiting for a trap, hitting the step_resume_break | |
2440 | doesn't count as getting it. */ | |
2441 | if (trap_expected) | |
2442 | ecs->another_trap = 1; | |
2443 | break; | |
c906108c | 2444 | |
c5aa993b JM |
2445 | case BPSTAT_WHAT_CHECK_SHLIBS: |
2446 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2447 | #ifdef SOLIB_ADD | |
c906108c | 2448 | { |
c5aa993b JM |
2449 | /* Remove breakpoints, we eventually want to step over the |
2450 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2451 | breakpoint addresses via breakpoint_re_set. */ | |
2452 | if (breakpoints_inserted) | |
2453 | remove_breakpoints (); | |
c906108c | 2454 | breakpoints_inserted = 0; |
c906108c | 2455 | |
c5aa993b JM |
2456 | /* Check for any newly added shared libraries if we're |
2457 | supposed to be adding them automatically. */ | |
2458 | if (auto_solib_add) | |
c906108c | 2459 | { |
c5aa993b JM |
2460 | /* Switch terminal for any messages produced by |
2461 | breakpoint_re_set. */ | |
2462 | target_terminal_ours_for_output (); | |
2463 | SOLIB_ADD (NULL, 0, NULL); | |
2464 | target_terminal_inferior (); | |
c906108c | 2465 | } |
c5aa993b JM |
2466 | |
2467 | /* Try to reenable shared library breakpoints, additional | |
2468 | code segments in shared libraries might be mapped in now. */ | |
2469 | re_enable_breakpoints_in_shlibs (); | |
2470 | ||
2471 | /* If requested, stop when the dynamic linker notifies | |
2472 | gdb of events. This allows the user to get control | |
2473 | and place breakpoints in initializer routines for | |
2474 | dynamically loaded objects (among other things). */ | |
2475 | if (stop_on_solib_events) | |
c906108c | 2476 | { |
104c1213 JM |
2477 | stop_stepping (ecs); |
2478 | return; | |
c906108c SS |
2479 | } |
2480 | ||
c5aa993b JM |
2481 | /* If we stopped due to an explicit catchpoint, then the |
2482 | (see above) call to SOLIB_ADD pulled in any symbols | |
2483 | from a newly-loaded library, if appropriate. | |
2484 | ||
2485 | We do want the inferior to stop, but not where it is | |
2486 | now, which is in the dynamic linker callback. Rather, | |
2487 | we would like it stop in the user's program, just after | |
2488 | the call that caused this catchpoint to trigger. That | |
2489 | gives the user a more useful vantage from which to | |
2490 | examine their program's state. */ | |
2491 | else if (what.main_action == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
2492 | { | |
2493 | /* ??rehrauer: If I could figure out how to get the | |
2494 | right return PC from here, we could just set a temp | |
2495 | breakpoint and resume. I'm not sure we can without | |
2496 | cracking open the dld's shared libraries and sniffing | |
2497 | their unwind tables and text/data ranges, and that's | |
2498 | not a terribly portable notion. | |
2499 | ||
2500 | Until that time, we must step the inferior out of the | |
2501 | dld callback, and also out of the dld itself (and any | |
2502 | code or stubs in libdld.sl, such as "shl_load" and | |
2503 | friends) until we reach non-dld code. At that point, | |
2504 | we can stop stepping. */ | |
2505 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2506 | &ecs->stepping_through_solib_catchpoints); | |
2507 | ecs->stepping_through_solib_after_catch = 1; | |
2508 | ||
2509 | /* Be sure to lift all breakpoints, so the inferior does | |
2510 | actually step past this point... */ | |
2511 | ecs->another_trap = 1; | |
2512 | break; | |
2513 | } | |
2514 | else | |
c906108c | 2515 | { |
c5aa993b | 2516 | /* We want to step over this breakpoint, then keep going. */ |
cd0fc7c3 | 2517 | ecs->another_trap = 1; |
c5aa993b | 2518 | break; |
c906108c | 2519 | } |
c5aa993b JM |
2520 | } |
2521 | #endif | |
2522 | break; | |
c906108c | 2523 | |
c5aa993b JM |
2524 | case BPSTAT_WHAT_LAST: |
2525 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2526 | |
c5aa993b JM |
2527 | case BPSTAT_WHAT_KEEP_CHECKING: |
2528 | break; | |
2529 | } | |
2530 | } | |
c906108c | 2531 | |
c5aa993b JM |
2532 | /* We come here if we hit a breakpoint but should not |
2533 | stop for it. Possibly we also were stepping | |
2534 | and should stop for that. So fall through and | |
2535 | test for stepping. But, if not stepping, | |
2536 | do not stop. */ | |
c906108c | 2537 | |
c5aa993b JM |
2538 | /* Are we stepping to get the inferior out of the dynamic |
2539 | linker's hook (and possibly the dld itself) after catching | |
2540 | a shlib event? */ | |
2541 | if (ecs->stepping_through_solib_after_catch) | |
2542 | { | |
2543 | #if defined(SOLIB_ADD) | |
2544 | /* Have we reached our destination? If not, keep going. */ | |
39f77062 | 2545 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) |
c5aa993b JM |
2546 | { |
2547 | ecs->another_trap = 1; | |
d4f3574e SS |
2548 | keep_going (ecs); |
2549 | return; | |
c5aa993b JM |
2550 | } |
2551 | #endif | |
2552 | /* Else, stop and report the catchpoint(s) whose triggering | |
2553 | caused us to begin stepping. */ | |
2554 | ecs->stepping_through_solib_after_catch = 0; | |
2555 | bpstat_clear (&stop_bpstat); | |
2556 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2557 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2558 | stop_print_frame = 1; | |
104c1213 JM |
2559 | stop_stepping (ecs); |
2560 | return; | |
c5aa993b | 2561 | } |
c906108c | 2562 | |
c5aa993b JM |
2563 | if (!CALL_DUMMY_BREAKPOINT_OFFSET_P) |
2564 | { | |
2565 | /* This is the old way of detecting the end of the stack dummy. | |
2566 | An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets | |
2567 | handled above. As soon as we can test it on all of them, all | |
2568 | architectures should define it. */ | |
2569 | ||
2570 | /* If this is the breakpoint at the end of a stack dummy, | |
2571 | just stop silently, unless the user was doing an si/ni, in which | |
2572 | case she'd better know what she's doing. */ | |
2573 | ||
2574 | if (CALL_DUMMY_HAS_COMPLETED (stop_pc, read_sp (), | |
2575 | FRAME_FP (get_current_frame ())) | |
2576 | && !step_range_end) | |
2577 | { | |
c906108c | 2578 | stop_print_frame = 0; |
c5aa993b JM |
2579 | stop_stack_dummy = 1; |
2580 | #ifdef HP_OS_BUG | |
2581 | trap_expected_after_continue = 1; | |
2582 | #endif | |
104c1213 JM |
2583 | stop_stepping (ecs); |
2584 | return; | |
c5aa993b JM |
2585 | } |
2586 | } | |
c906108c | 2587 | |
c5aa993b | 2588 | if (step_resume_breakpoint) |
104c1213 JM |
2589 | { |
2590 | /* Having a step-resume breakpoint overrides anything | |
2591 | else having to do with stepping commands until | |
2592 | that breakpoint is reached. */ | |
2593 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2594 | whether it could/should be keep_going. */ | |
2595 | check_sigtramp2 (ecs); | |
d4f3574e SS |
2596 | keep_going (ecs); |
2597 | return; | |
104c1213 JM |
2598 | } |
2599 | ||
c5aa993b | 2600 | if (step_range_end == 0) |
104c1213 JM |
2601 | { |
2602 | /* Likewise if we aren't even stepping. */ | |
2603 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2604 | whether it could/should be keep_going. */ | |
2605 | check_sigtramp2 (ecs); | |
d4f3574e SS |
2606 | keep_going (ecs); |
2607 | return; | |
104c1213 | 2608 | } |
c5aa993b JM |
2609 | |
2610 | /* If stepping through a line, keep going if still within it. | |
2611 | ||
2612 | Note that step_range_end is the address of the first instruction | |
2613 | beyond the step range, and NOT the address of the last instruction | |
2614 | within it! */ | |
2615 | if (stop_pc >= step_range_start | |
2616 | && stop_pc < step_range_end) | |
2617 | { | |
2618 | /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal. | |
2619 | So definately need to check for sigtramp here. */ | |
104c1213 | 2620 | check_sigtramp2 (ecs); |
d4f3574e SS |
2621 | keep_going (ecs); |
2622 | return; | |
c5aa993b | 2623 | } |
c906108c | 2624 | |
c5aa993b | 2625 | /* We stepped out of the stepping range. */ |
c906108c | 2626 | |
c5aa993b JM |
2627 | /* If we are stepping at the source level and entered the runtime |
2628 | loader dynamic symbol resolution code, we keep on single stepping | |
2629 | until we exit the run time loader code and reach the callee's | |
2630 | address. */ | |
5fbbeb29 | 2631 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) |
d4f3574e SS |
2632 | { |
2633 | CORE_ADDR pc_after_resolver = SKIP_SOLIB_RESOLVER (stop_pc); | |
2634 | ||
2635 | if (pc_after_resolver) | |
2636 | { | |
2637 | /* Set up a step-resume breakpoint at the address | |
2638 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2639 | struct symtab_and_line sr_sal; | |
2640 | INIT_SAL (&sr_sal); | |
2641 | sr_sal.pc = pc_after_resolver; | |
2642 | ||
2643 | check_for_old_step_resume_breakpoint (); | |
2644 | step_resume_breakpoint = | |
2645 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2646 | if (breakpoints_inserted) | |
2647 | insert_breakpoints (); | |
2648 | } | |
2649 | ||
2650 | keep_going (ecs); | |
2651 | return; | |
2652 | } | |
c906108c | 2653 | |
c5aa993b JM |
2654 | /* We can't update step_sp every time through the loop, because |
2655 | reading the stack pointer would slow down stepping too much. | |
2656 | But we can update it every time we leave the step range. */ | |
2657 | ecs->update_step_sp = 1; | |
c906108c | 2658 | |
c5aa993b JM |
2659 | /* Did we just take a signal? */ |
2660 | if (IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
2661 | && !IN_SIGTRAMP (prev_pc, prev_func_name) | |
2662 | && INNER_THAN (read_sp (), step_sp)) | |
2663 | { | |
2664 | /* We've just taken a signal; go until we are back to | |
2665 | the point where we took it and one more. */ | |
c906108c | 2666 | |
c5aa993b JM |
2667 | /* Note: The test above succeeds not only when we stepped |
2668 | into a signal handler, but also when we step past the last | |
2669 | statement of a signal handler and end up in the return stub | |
2670 | of the signal handler trampoline. To distinguish between | |
2671 | these two cases, check that the frame is INNER_THAN the | |
2672 | previous one below. pai/1997-09-11 */ | |
c906108c | 2673 | |
c906108c | 2674 | |
c5aa993b JM |
2675 | { |
2676 | CORE_ADDR current_frame = FRAME_FP (get_current_frame ()); | |
c906108c | 2677 | |
c5aa993b JM |
2678 | if (INNER_THAN (current_frame, step_frame_address)) |
2679 | { | |
2680 | /* We have just taken a signal; go until we are back to | |
2681 | the point where we took it and one more. */ | |
c906108c | 2682 | |
c5aa993b JM |
2683 | /* This code is needed at least in the following case: |
2684 | The user types "next" and then a signal arrives (before | |
2685 | the "next" is done). */ | |
c906108c | 2686 | |
c5aa993b JM |
2687 | /* Note that if we are stopped at a breakpoint, then we need |
2688 | the step_resume breakpoint to override any breakpoints at | |
2689 | the same location, so that we will still step over the | |
2690 | breakpoint even though the signal happened. */ | |
2691 | struct symtab_and_line sr_sal; | |
c906108c | 2692 | |
c5aa993b JM |
2693 | INIT_SAL (&sr_sal); |
2694 | sr_sal.symtab = NULL; | |
2695 | sr_sal.line = 0; | |
2696 | sr_sal.pc = prev_pc; | |
2697 | /* We could probably be setting the frame to | |
2698 | step_frame_address; I don't think anyone thought to | |
2699 | try it. */ | |
a0b3c4fd | 2700 | check_for_old_step_resume_breakpoint (); |
c5aa993b JM |
2701 | step_resume_breakpoint = |
2702 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2703 | if (breakpoints_inserted) | |
2704 | insert_breakpoints (); | |
c906108c | 2705 | } |
c5aa993b | 2706 | else |
c906108c | 2707 | { |
c5aa993b JM |
2708 | /* We just stepped out of a signal handler and into |
2709 | its calling trampoline. | |
2710 | ||
d4f3574e | 2711 | Normally, we'd call step_over_function from |
c5aa993b JM |
2712 | here, but for some reason GDB can't unwind the |
2713 | stack correctly to find the real PC for the point | |
2714 | user code where the signal trampoline will return | |
2715 | -- FRAME_SAVED_PC fails, at least on HP-UX 10.20. | |
2716 | But signal trampolines are pretty small stubs of | |
2717 | code, anyway, so it's OK instead to just | |
2718 | single-step out. Note: assuming such trampolines | |
2719 | don't exhibit recursion on any platform... */ | |
2720 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
2721 | &ecs->stop_func_start, | |
2722 | &ecs->stop_func_end); | |
2723 | /* Readjust stepping range */ | |
2724 | step_range_start = ecs->stop_func_start; | |
2725 | step_range_end = ecs->stop_func_end; | |
2726 | ecs->stepping_through_sigtramp = 1; | |
c906108c | 2727 | } |
c906108c SS |
2728 | } |
2729 | ||
c906108c | 2730 | |
c5aa993b JM |
2731 | /* If this is stepi or nexti, make sure that the stepping range |
2732 | gets us past that instruction. */ | |
2733 | if (step_range_end == 1) | |
2734 | /* FIXME: Does this run afoul of the code below which, if | |
2735 | we step into the middle of a line, resets the stepping | |
2736 | range? */ | |
2737 | step_range_end = (step_range_start = prev_pc) + 1; | |
c906108c | 2738 | |
c5aa993b | 2739 | ecs->remove_breakpoints_on_following_step = 1; |
d4f3574e SS |
2740 | keep_going (ecs); |
2741 | return; | |
c5aa993b | 2742 | } |
c906108c | 2743 | |
c5aa993b JM |
2744 | if (stop_pc == ecs->stop_func_start /* Quick test */ |
2745 | || (in_prologue (stop_pc, ecs->stop_func_start) && | |
2746 | !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2747 | || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name) | |
2748 | || ecs->stop_func_name == 0) | |
2749 | { | |
2750 | /* It's a subroutine call. */ | |
c906108c | 2751 | |
100a02e1 AC |
2752 | if ((step_over_calls == STEP_OVER_NONE) |
2753 | || ((step_range_end == 1) | |
2754 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
c906108c | 2755 | { |
c5aa993b JM |
2756 | /* I presume that step_over_calls is only 0 when we're |
2757 | supposed to be stepping at the assembly language level | |
2758 | ("stepi"). Just stop. */ | |
100a02e1 AC |
2759 | /* Also, maybe we just did a "nexti" inside a prolog, |
2760 | so we thought it was a subroutine call but it was not. | |
2761 | Stop as well. FENN */ | |
c5aa993b | 2762 | stop_step = 1; |
11cf8741 | 2763 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2764 | stop_stepping (ecs); |
2765 | return; | |
c5aa993b | 2766 | } |
c906108c | 2767 | |
5fbbeb29 | 2768 | if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc)) |
d4f3574e SS |
2769 | { |
2770 | /* We're doing a "next". */ | |
d41707c8 MK |
2771 | |
2772 | if (IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
2773 | && INNER_THAN (step_frame_address, read_sp())) | |
2774 | /* We stepped out of a signal handler, and into its | |
2775 | calling trampoline. This is misdetected as a | |
2776 | subroutine call, but stepping over the signal | |
2777 | trampoline isn't such a bad idea. In order to do | |
2778 | that, we have to ignore the value in | |
2779 | step_frame_address, since that doesn't represent the | |
2780 | frame that'll reach when we return from the signal | |
2781 | trampoline. Otherwise we'll probably continue to the | |
2782 | end of the program. */ | |
2783 | step_frame_address = 0; | |
2784 | ||
d4f3574e SS |
2785 | step_over_function (ecs); |
2786 | keep_going (ecs); | |
2787 | return; | |
2788 | } | |
c5aa993b JM |
2789 | |
2790 | /* If we are in a function call trampoline (a stub between | |
2791 | the calling routine and the real function), locate the real | |
2792 | function. That's what tells us (a) whether we want to step | |
2793 | into it at all, and (b) what prologue we want to run to | |
2794 | the end of, if we do step into it. */ | |
2795 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2796 | if (tmp != 0) | |
2797 | ecs->stop_func_start = tmp; | |
2798 | else | |
2799 | { | |
2800 | tmp = DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc); | |
2801 | if (tmp) | |
c906108c | 2802 | { |
c5aa993b JM |
2803 | struct symtab_and_line xxx; |
2804 | /* Why isn't this s_a_l called "sr_sal", like all of the | |
2805 | other s_a_l's where this code is duplicated? */ | |
2806 | INIT_SAL (&xxx); /* initialize to zeroes */ | |
2807 | xxx.pc = tmp; | |
2808 | xxx.section = find_pc_overlay (xxx.pc); | |
a0b3c4fd | 2809 | check_for_old_step_resume_breakpoint (); |
c906108c | 2810 | step_resume_breakpoint = |
c5aa993b JM |
2811 | set_momentary_breakpoint (xxx, NULL, bp_step_resume); |
2812 | insert_breakpoints (); | |
d4f3574e SS |
2813 | keep_going (ecs); |
2814 | return; | |
c906108c SS |
2815 | } |
2816 | } | |
2817 | ||
c5aa993b JM |
2818 | /* If we have line number information for the function we |
2819 | are thinking of stepping into, step into it. | |
c906108c | 2820 | |
c5aa993b JM |
2821 | If there are several symtabs at that PC (e.g. with include |
2822 | files), just want to know whether *any* of them have line | |
2823 | numbers. find_pc_line handles this. */ | |
2824 | { | |
2825 | struct symtab_and_line tmp_sal; | |
c906108c | 2826 | |
c5aa993b JM |
2827 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2828 | if (tmp_sal.line != 0) | |
c2c6d25f JM |
2829 | { |
2830 | step_into_function (ecs); | |
2831 | return; | |
2832 | } | |
c906108c | 2833 | } |
5fbbeb29 CF |
2834 | |
2835 | /* If we have no line number and the step-stop-if-no-debug | |
2836 | is set, we stop the step so that the user has a chance to | |
2837 | switch in assembly mode. */ | |
2838 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) | |
2839 | { | |
2840 | stop_step = 1; | |
2841 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2842 | stop_stepping (ecs); | |
2843 | return; | |
2844 | } | |
2845 | ||
d4f3574e SS |
2846 | step_over_function (ecs); |
2847 | keep_going (ecs); | |
2848 | return; | |
c906108c | 2849 | |
c5aa993b | 2850 | } |
c906108c | 2851 | |
c5aa993b | 2852 | /* We've wandered out of the step range. */ |
c906108c | 2853 | |
c5aa993b | 2854 | ecs->sal = find_pc_line (stop_pc, 0); |
c906108c | 2855 | |
c5aa993b JM |
2856 | if (step_range_end == 1) |
2857 | { | |
2858 | /* It is stepi or nexti. We always want to stop stepping after | |
2859 | one instruction. */ | |
2860 | stop_step = 1; | |
11cf8741 | 2861 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2862 | stop_stepping (ecs); |
2863 | return; | |
c5aa993b | 2864 | } |
c906108c | 2865 | |
c5aa993b JM |
2866 | /* If we're in the return path from a shared library trampoline, |
2867 | we want to proceed through the trampoline when stepping. */ | |
2868 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2869 | { | |
2870 | CORE_ADDR tmp; | |
c906108c | 2871 | |
c5aa993b JM |
2872 | /* Determine where this trampoline returns. */ |
2873 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
c906108c | 2874 | |
c5aa993b JM |
2875 | /* Only proceed through if we know where it's going. */ |
2876 | if (tmp) | |
2877 | { | |
2878 | /* And put the step-breakpoint there and go until there. */ | |
2879 | struct symtab_and_line sr_sal; | |
c906108c | 2880 | |
c5aa993b JM |
2881 | INIT_SAL (&sr_sal); /* initialize to zeroes */ |
2882 | sr_sal.pc = tmp; | |
2883 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2884 | /* Do not specify what the fp should be when we stop | |
2885 | since on some machines the prologue | |
2886 | is where the new fp value is established. */ | |
a0b3c4fd | 2887 | check_for_old_step_resume_breakpoint (); |
c5aa993b JM |
2888 | step_resume_breakpoint = |
2889 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2890 | if (breakpoints_inserted) | |
2891 | insert_breakpoints (); | |
c906108c | 2892 | |
c5aa993b JM |
2893 | /* Restart without fiddling with the step ranges or |
2894 | other state. */ | |
d4f3574e SS |
2895 | keep_going (ecs); |
2896 | return; | |
c5aa993b JM |
2897 | } |
2898 | } | |
c906108c | 2899 | |
c5aa993b | 2900 | if (ecs->sal.line == 0) |
c906108c | 2901 | { |
c5aa993b JM |
2902 | /* We have no line number information. That means to stop |
2903 | stepping (does this always happen right after one instruction, | |
2904 | when we do "s" in a function with no line numbers, | |
2905 | or can this happen as a result of a return or longjmp?). */ | |
2906 | stop_step = 1; | |
11cf8741 | 2907 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2908 | stop_stepping (ecs); |
2909 | return; | |
c906108c SS |
2910 | } |
2911 | ||
c5aa993b JM |
2912 | if ((stop_pc == ecs->sal.pc) |
2913 | && (ecs->current_line != ecs->sal.line || ecs->current_symtab != ecs->sal.symtab)) | |
2914 | { | |
2915 | /* We are at the start of a different line. So stop. Note that | |
2916 | we don't stop if we step into the middle of a different line. | |
2917 | That is said to make things like for (;;) statements work | |
2918 | better. */ | |
2919 | stop_step = 1; | |
11cf8741 | 2920 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2921 | stop_stepping (ecs); |
2922 | return; | |
c5aa993b | 2923 | } |
c906108c | 2924 | |
c5aa993b | 2925 | /* We aren't done stepping. |
c906108c | 2926 | |
c5aa993b JM |
2927 | Optimize by setting the stepping range to the line. |
2928 | (We might not be in the original line, but if we entered a | |
2929 | new line in mid-statement, we continue stepping. This makes | |
2930 | things like for(;;) statements work better.) */ | |
c906108c | 2931 | |
c5aa993b JM |
2932 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
2933 | { | |
2934 | /* If this is the last line of the function, don't keep stepping | |
2935 | (it would probably step us out of the function). | |
2936 | This is particularly necessary for a one-line function, | |
2937 | in which after skipping the prologue we better stop even though | |
2938 | we will be in mid-line. */ | |
2939 | stop_step = 1; | |
11cf8741 | 2940 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2941 | stop_stepping (ecs); |
2942 | return; | |
c5aa993b JM |
2943 | } |
2944 | step_range_start = ecs->sal.pc; | |
2945 | step_range_end = ecs->sal.end; | |
2946 | step_frame_address = FRAME_FP (get_current_frame ()); | |
2947 | ecs->current_line = ecs->sal.line; | |
2948 | ecs->current_symtab = ecs->sal.symtab; | |
2949 | ||
2950 | /* In the case where we just stepped out of a function into the middle | |
2951 | of a line of the caller, continue stepping, but step_frame_address | |
2952 | must be modified to current frame */ | |
2953 | { | |
2954 | CORE_ADDR current_frame = FRAME_FP (get_current_frame ()); | |
2955 | if (!(INNER_THAN (current_frame, step_frame_address))) | |
2956 | step_frame_address = current_frame; | |
2957 | } | |
c906108c | 2958 | |
d4f3574e | 2959 | keep_going (ecs); |
cd0fc7c3 | 2960 | |
104c1213 | 2961 | } /* extra brace, to preserve old indentation */ |
104c1213 JM |
2962 | } |
2963 | ||
2964 | /* Are we in the middle of stepping? */ | |
2965 | ||
2966 | static int | |
2967 | currently_stepping (struct execution_control_state *ecs) | |
2968 | { | |
2969 | return ((through_sigtramp_breakpoint == NULL | |
2970 | && !ecs->handling_longjmp | |
2971 | && ((step_range_end && step_resume_breakpoint == NULL) | |
2972 | || trap_expected)) | |
2973 | || ecs->stepping_through_solib_after_catch | |
2974 | || bpstat_should_step ()); | |
2975 | } | |
c906108c | 2976 | |
104c1213 JM |
2977 | static void |
2978 | check_sigtramp2 (struct execution_control_state *ecs) | |
2979 | { | |
2980 | if (trap_expected | |
2981 | && IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
2982 | && !IN_SIGTRAMP (prev_pc, prev_func_name) | |
2983 | && INNER_THAN (read_sp (), step_sp)) | |
2984 | { | |
2985 | /* What has happened here is that we have just stepped the | |
2986 | inferior with a signal (because it is a signal which | |
2987 | shouldn't make us stop), thus stepping into sigtramp. | |
2988 | ||
2989 | So we need to set a step_resume_break_address breakpoint and | |
2990 | continue until we hit it, and then step. FIXME: This should | |
2991 | be more enduring than a step_resume breakpoint; we should | |
2992 | know that we will later need to keep going rather than | |
2993 | re-hitting the breakpoint here (see the testsuite, | |
2994 | gdb.base/signals.exp where it says "exceedingly difficult"). */ | |
2995 | ||
2996 | struct symtab_and_line sr_sal; | |
2997 | ||
2998 | INIT_SAL (&sr_sal); /* initialize to zeroes */ | |
2999 | sr_sal.pc = prev_pc; | |
3000 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
3001 | /* We perhaps could set the frame if we kept track of what the | |
3002 | frame corresponding to prev_pc was. But we don't, so don't. */ | |
3003 | through_sigtramp_breakpoint = | |
3004 | set_momentary_breakpoint (sr_sal, NULL, bp_through_sigtramp); | |
3005 | if (breakpoints_inserted) | |
3006 | insert_breakpoints (); | |
cd0fc7c3 | 3007 | |
104c1213 JM |
3008 | ecs->remove_breakpoints_on_following_step = 1; |
3009 | ecs->another_trap = 1; | |
3010 | } | |
3011 | } | |
3012 | ||
c2c6d25f JM |
3013 | /* Subroutine call with source code we should not step over. Do step |
3014 | to the first line of code in it. */ | |
3015 | ||
3016 | static void | |
3017 | step_into_function (struct execution_control_state *ecs) | |
3018 | { | |
3019 | struct symtab *s; | |
3020 | struct symtab_and_line sr_sal; | |
3021 | ||
3022 | s = find_pc_symtab (stop_pc); | |
3023 | if (s && s->language != language_asm) | |
3024 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
3025 | ||
3026 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
3027 | /* Use the step_resume_break to step until the end of the prologue, | |
3028 | even if that involves jumps (as it seems to on the vax under | |
3029 | 4.2). */ | |
3030 | /* If the prologue ends in the middle of a source line, continue to | |
3031 | the end of that source line (if it is still within the function). | |
3032 | Otherwise, just go to end of prologue. */ | |
3033 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP | |
3034 | /* no, don't either. It skips any code that's legitimately on the | |
3035 | first line. */ | |
3036 | #else | |
3037 | if (ecs->sal.end | |
3038 | && ecs->sal.pc != ecs->stop_func_start | |
3039 | && ecs->sal.end < ecs->stop_func_end) | |
3040 | ecs->stop_func_start = ecs->sal.end; | |
3041 | #endif | |
3042 | ||
3043 | if (ecs->stop_func_start == stop_pc) | |
3044 | { | |
3045 | /* We are already there: stop now. */ | |
3046 | stop_step = 1; | |
11cf8741 | 3047 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
3048 | stop_stepping (ecs); |
3049 | return; | |
3050 | } | |
3051 | else | |
3052 | { | |
3053 | /* Put the step-breakpoint there and go until there. */ | |
3054 | INIT_SAL (&sr_sal); /* initialize to zeroes */ | |
3055 | sr_sal.pc = ecs->stop_func_start; | |
3056 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
3057 | /* Do not specify what the fp should be when we stop since on | |
3058 | some machines the prologue is where the new fp value is | |
3059 | established. */ | |
3060 | check_for_old_step_resume_breakpoint (); | |
3061 | step_resume_breakpoint = | |
3062 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
3063 | if (breakpoints_inserted) | |
3064 | insert_breakpoints (); | |
3065 | ||
3066 | /* And make sure stepping stops right away then. */ | |
3067 | step_range_end = step_range_start; | |
3068 | } | |
3069 | keep_going (ecs); | |
3070 | } | |
d4f3574e SS |
3071 | |
3072 | /* We've just entered a callee, and we wish to resume until it returns | |
3073 | to the caller. Setting a step_resume breakpoint on the return | |
3074 | address will catch a return from the callee. | |
3075 | ||
3076 | However, if the callee is recursing, we want to be careful not to | |
3077 | catch returns of those recursive calls, but only of THIS instance | |
3078 | of the call. | |
3079 | ||
3080 | To do this, we set the step_resume bp's frame to our current | |
3081 | caller's frame (step_frame_address, which is set by the "next" or | |
3082 | "until" command, before execution begins). */ | |
3083 | ||
3084 | static void | |
3085 | step_over_function (struct execution_control_state *ecs) | |
3086 | { | |
3087 | struct symtab_and_line sr_sal; | |
3088 | ||
3089 | INIT_SAL (&sr_sal); /* initialize to zeros */ | |
3090 | sr_sal.pc = ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ())); | |
3091 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
3092 | ||
3093 | check_for_old_step_resume_breakpoint (); | |
3094 | step_resume_breakpoint = | |
3095 | set_momentary_breakpoint (sr_sal, get_current_frame (), bp_step_resume); | |
3096 | ||
d41707c8 | 3097 | if (step_frame_address && !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc)) |
d4f3574e SS |
3098 | step_resume_breakpoint->frame = step_frame_address; |
3099 | ||
3100 | if (breakpoints_inserted) | |
3101 | insert_breakpoints (); | |
3102 | } | |
3103 | ||
104c1213 JM |
3104 | static void |
3105 | stop_stepping (struct execution_control_state *ecs) | |
3106 | { | |
c906108c SS |
3107 | if (target_has_execution) |
3108 | { | |
3109 | /* Are we stopping for a vfork event? We only stop when we see | |
3110 | the child's event. However, we may not yet have seen the | |
39f77062 | 3111 | parent's event. And, inferior_ptid is still set to the |
104c1213 JM |
3112 | parent's pid, until we resume again and follow either the |
3113 | parent or child. | |
c906108c | 3114 | |
39f77062 | 3115 | To ensure that we can really touch inferior_ptid (aka, the |
c906108c SS |
3116 | parent process) -- which calls to functions like read_pc |
3117 | implicitly do -- wait on the parent if necessary. */ | |
3118 | if ((pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
3119 | && !pending_follow.fork_event.saw_parent_fork) | |
3120 | { | |
39f77062 | 3121 | ptid_t parent_ptid; |
c906108c SS |
3122 | |
3123 | do | |
3124 | { | |
3125 | if (target_wait_hook) | |
39f77062 | 3126 | parent_ptid = target_wait_hook (pid_to_ptid (-1), &(ecs->ws)); |
c906108c | 3127 | else |
39f77062 | 3128 | parent_ptid = target_wait (pid_to_ptid (-1), &(ecs->ws)); |
c906108c | 3129 | } |
39f77062 | 3130 | while (! ptid_equal (parent_ptid, inferior_ptid)); |
c906108c SS |
3131 | } |
3132 | ||
c906108c | 3133 | /* Assuming the inferior still exists, set these up for next |
c5aa993b JM |
3134 | time, just like we did above if we didn't break out of the |
3135 | loop. */ | |
c906108c | 3136 | prev_pc = read_pc (); |
cd0fc7c3 SS |
3137 | prev_func_start = ecs->stop_func_start; |
3138 | prev_func_name = ecs->stop_func_name; | |
c906108c | 3139 | } |
104c1213 | 3140 | |
cd0fc7c3 SS |
3141 | /* Let callers know we don't want to wait for the inferior anymore. */ |
3142 | ecs->wait_some_more = 0; | |
3143 | } | |
3144 | ||
d4f3574e SS |
3145 | /* This function handles various cases where we need to continue |
3146 | waiting for the inferior. */ | |
3147 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
3148 | ||
3149 | static void | |
3150 | keep_going (struct execution_control_state *ecs) | |
3151 | { | |
3152 | /* ??rehrauer: ttrace on HP-UX theoretically allows one to debug a | |
3153 | vforked child between its creation and subsequent exit or call to | |
3154 | exec(). However, I had big problems in this rather creaky exec | |
3155 | engine, getting that to work. The fundamental problem is that | |
3156 | I'm trying to debug two processes via an engine that only | |
3157 | understands a single process with possibly multiple threads. | |
3158 | ||
3159 | Hence, this spot is known to have problems when | |
3160 | target_can_follow_vfork_prior_to_exec returns 1. */ | |
3161 | ||
3162 | /* Save the pc before execution, to compare with pc after stop. */ | |
3163 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ | |
3164 | prev_func_start = ecs->stop_func_start; /* Ok, since if DECR_PC_AFTER | |
3165 | BREAK is defined, the | |
3166 | original pc would not have | |
3167 | been at the start of a | |
3168 | function. */ | |
3169 | prev_func_name = ecs->stop_func_name; | |
3170 | ||
3171 | if (ecs->update_step_sp) | |
3172 | step_sp = read_sp (); | |
3173 | ecs->update_step_sp = 0; | |
3174 | ||
3175 | /* If we did not do break;, it means we should keep running the | |
3176 | inferior and not return to debugger. */ | |
3177 | ||
3178 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
3179 | { | |
3180 | /* We took a signal (which we are supposed to pass through to | |
3181 | the inferior, else we'd have done a break above) and we | |
3182 | haven't yet gotten our trap. Simply continue. */ | |
3183 | resume (currently_stepping (ecs), stop_signal); | |
3184 | } | |
3185 | else | |
3186 | { | |
3187 | /* Either the trap was not expected, but we are continuing | |
3188 | anyway (the user asked that this signal be passed to the | |
3189 | child) | |
3190 | -- or -- | |
3191 | The signal was SIGTRAP, e.g. it was our signal, but we | |
3192 | decided we should resume from it. | |
3193 | ||
3194 | We're going to run this baby now! | |
3195 | ||
3196 | Insert breakpoints now, unless we are trying to one-proceed | |
3197 | past a breakpoint. */ | |
3198 | /* If we've just finished a special step resume and we don't | |
3199 | want to hit a breakpoint, pull em out. */ | |
3200 | if (step_resume_breakpoint == NULL | |
3201 | && through_sigtramp_breakpoint == NULL | |
3202 | && ecs->remove_breakpoints_on_following_step) | |
3203 | { | |
3204 | ecs->remove_breakpoints_on_following_step = 0; | |
3205 | remove_breakpoints (); | |
3206 | breakpoints_inserted = 0; | |
3207 | } | |
3208 | else if (!breakpoints_inserted && | |
3209 | (through_sigtramp_breakpoint != NULL || !ecs->another_trap)) | |
3210 | { | |
3211 | breakpoints_failed = insert_breakpoints (); | |
3212 | if (breakpoints_failed) | |
3213 | { | |
3214 | stop_stepping (ecs); | |
3215 | return; | |
3216 | } | |
3217 | breakpoints_inserted = 1; | |
3218 | } | |
3219 | ||
3220 | trap_expected = ecs->another_trap; | |
3221 | ||
3222 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
3223 | specifies that such a signal should be delivered to the | |
3224 | target program). | |
3225 | ||
3226 | Typically, this would occure when a user is debugging a | |
3227 | target monitor on a simulator: the target monitor sets a | |
3228 | breakpoint; the simulator encounters this break-point and | |
3229 | halts the simulation handing control to GDB; GDB, noteing | |
3230 | that the break-point isn't valid, returns control back to the | |
3231 | simulator; the simulator then delivers the hardware | |
3232 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
3233 | ||
3234 | if (stop_signal == TARGET_SIGNAL_TRAP | |
3235 | && !signal_program[stop_signal]) | |
3236 | stop_signal = TARGET_SIGNAL_0; | |
3237 | ||
3238 | #ifdef SHIFT_INST_REGS | |
3239 | /* I'm not sure when this following segment applies. I do know, | |
3240 | now, that we shouldn't rewrite the regs when we were stopped | |
3241 | by a random signal from the inferior process. */ | |
3242 | /* FIXME: Shouldn't this be based on the valid bit of the SXIP? | |
3243 | (this is only used on the 88k). */ | |
3244 | ||
3245 | if (!bpstat_explains_signal (stop_bpstat) | |
3246 | && (stop_signal != TARGET_SIGNAL_CHLD) | |
3247 | && !stopped_by_random_signal) | |
3248 | SHIFT_INST_REGS (); | |
3249 | #endif /* SHIFT_INST_REGS */ | |
3250 | ||
3251 | resume (currently_stepping (ecs), stop_signal); | |
3252 | } | |
3253 | ||
3254 | prepare_to_wait (ecs); | |
3255 | } | |
3256 | ||
104c1213 JM |
3257 | /* This function normally comes after a resume, before |
3258 | handle_inferior_event exits. It takes care of any last bits of | |
3259 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 3260 | |
104c1213 JM |
3261 | static void |
3262 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 3263 | { |
104c1213 JM |
3264 | if (ecs->infwait_state == infwait_normal_state) |
3265 | { | |
3266 | overlay_cache_invalid = 1; | |
3267 | ||
3268 | /* We have to invalidate the registers BEFORE calling | |
3269 | target_wait because they can be loaded from the target while | |
3270 | in target_wait. This makes remote debugging a bit more | |
3271 | efficient for those targets that provide critical registers | |
3272 | as part of their normal status mechanism. */ | |
3273 | ||
3274 | registers_changed (); | |
39f77062 | 3275 | ecs->waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
3276 | ecs->wp = &(ecs->ws); |
3277 | } | |
3278 | /* This is the old end of the while loop. Let everybody know we | |
3279 | want to wait for the inferior some more and get called again | |
3280 | soon. */ | |
3281 | ecs->wait_some_more = 1; | |
c906108c | 3282 | } |
11cf8741 JM |
3283 | |
3284 | /* Print why the inferior has stopped. We always print something when | |
3285 | the inferior exits, or receives a signal. The rest of the cases are | |
3286 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
3287 | there should be a call to this function from handle_inferior_event() | |
3288 | each time stop_stepping() is called.*/ | |
3289 | static void | |
3290 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
3291 | { | |
3292 | switch (stop_reason) | |
3293 | { | |
3294 | case STOP_UNKNOWN: | |
3295 | /* We don't deal with these cases from handle_inferior_event() | |
3296 | yet. */ | |
3297 | break; | |
3298 | case END_STEPPING_RANGE: | |
3299 | /* We are done with a step/next/si/ni command. */ | |
3300 | /* For now print nothing. */ | |
fb40c209 AC |
3301 | #ifdef UI_OUT |
3302 | /* Print a message only if not in the middle of doing a "step n" | |
3303 | operation for n > 1 */ | |
3304 | if (!step_multi || !stop_step) | |
9dc5e2a9 | 3305 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 AC |
3306 | ui_out_field_string (uiout, "reason", "end-stepping-range"); |
3307 | #endif | |
11cf8741 JM |
3308 | break; |
3309 | case BREAKPOINT_HIT: | |
3310 | /* We found a breakpoint. */ | |
3311 | /* For now print nothing. */ | |
3312 | break; | |
3313 | case SIGNAL_EXITED: | |
3314 | /* The inferior was terminated by a signal. */ | |
8b93c638 JM |
3315 | #ifdef UI_OUT |
3316 | annotate_signalled (); | |
9dc5e2a9 | 3317 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3318 | ui_out_field_string (uiout, "reason", "exited-signalled"); |
8b93c638 JM |
3319 | ui_out_text (uiout, "\nProgram terminated with signal "); |
3320 | annotate_signal_name (); | |
3321 | ui_out_field_string (uiout, "signal-name", target_signal_to_name (stop_info)); | |
3322 | annotate_signal_name_end (); | |
3323 | ui_out_text (uiout, ", "); | |
3324 | annotate_signal_string (); | |
3325 | ui_out_field_string (uiout, "signal-meaning", target_signal_to_string (stop_info)); | |
3326 | annotate_signal_string_end (); | |
3327 | ui_out_text (uiout, ".\n"); | |
3328 | ui_out_text (uiout, "The program no longer exists.\n"); | |
3329 | #else | |
11cf8741 JM |
3330 | annotate_signalled (); |
3331 | printf_filtered ("\nProgram terminated with signal "); | |
3332 | annotate_signal_name (); | |
3333 | printf_filtered ("%s", target_signal_to_name (stop_info)); | |
3334 | annotate_signal_name_end (); | |
3335 | printf_filtered (", "); | |
3336 | annotate_signal_string (); | |
3337 | printf_filtered ("%s", target_signal_to_string (stop_info)); | |
3338 | annotate_signal_string_end (); | |
3339 | printf_filtered (".\n"); | |
3340 | ||
3341 | printf_filtered ("The program no longer exists.\n"); | |
3342 | gdb_flush (gdb_stdout); | |
8b93c638 | 3343 | #endif |
11cf8741 JM |
3344 | break; |
3345 | case EXITED: | |
3346 | /* The inferior program is finished. */ | |
8b93c638 JM |
3347 | #ifdef UI_OUT |
3348 | annotate_exited (stop_info); | |
3349 | if (stop_info) | |
3350 | { | |
9dc5e2a9 | 3351 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3352 | ui_out_field_string (uiout, "reason", "exited"); |
8b93c638 JM |
3353 | ui_out_text (uiout, "\nProgram exited with code "); |
3354 | ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) stop_info); | |
3355 | ui_out_text (uiout, ".\n"); | |
3356 | } | |
3357 | else | |
3358 | { | |
9dc5e2a9 | 3359 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 | 3360 | ui_out_field_string (uiout, "reason", "exited-normally"); |
8b93c638 JM |
3361 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
3362 | } | |
3363 | #else | |
11cf8741 JM |
3364 | annotate_exited (stop_info); |
3365 | if (stop_info) | |
3366 | printf_filtered ("\nProgram exited with code 0%o.\n", | |
3367 | (unsigned int) stop_info); | |
3368 | else | |
3369 | printf_filtered ("\nProgram exited normally.\n"); | |
8b93c638 | 3370 | #endif |
11cf8741 JM |
3371 | break; |
3372 | case SIGNAL_RECEIVED: | |
3373 | /* Signal received. The signal table tells us to print about | |
3374 | it. */ | |
8b93c638 JM |
3375 | #ifdef UI_OUT |
3376 | annotate_signal (); | |
3377 | ui_out_text (uiout, "\nProgram received signal "); | |
3378 | annotate_signal_name (); | |
84c6c83c KS |
3379 | if (ui_out_is_mi_like_p (uiout)) |
3380 | ui_out_field_string (uiout, "reason", "signal-received"); | |
8b93c638 JM |
3381 | ui_out_field_string (uiout, "signal-name", target_signal_to_name (stop_info)); |
3382 | annotate_signal_name_end (); | |
3383 | ui_out_text (uiout, ", "); | |
3384 | annotate_signal_string (); | |
3385 | ui_out_field_string (uiout, "signal-meaning", target_signal_to_string (stop_info)); | |
3386 | annotate_signal_string_end (); | |
3387 | ui_out_text (uiout, ".\n"); | |
3388 | #else | |
11cf8741 JM |
3389 | annotate_signal (); |
3390 | printf_filtered ("\nProgram received signal "); | |
3391 | annotate_signal_name (); | |
3392 | printf_filtered ("%s", target_signal_to_name (stop_info)); | |
3393 | annotate_signal_name_end (); | |
3394 | printf_filtered (", "); | |
3395 | annotate_signal_string (); | |
3396 | printf_filtered ("%s", target_signal_to_string (stop_info)); | |
3397 | annotate_signal_string_end (); | |
3398 | printf_filtered (".\n"); | |
3399 | gdb_flush (gdb_stdout); | |
8b93c638 | 3400 | #endif |
11cf8741 JM |
3401 | break; |
3402 | default: | |
8e65ff28 AC |
3403 | internal_error (__FILE__, __LINE__, |
3404 | "print_stop_reason: unrecognized enum value"); | |
11cf8741 JM |
3405 | break; |
3406 | } | |
3407 | } | |
c906108c | 3408 | \f |
43ff13b4 | 3409 | |
c906108c SS |
3410 | /* Here to return control to GDB when the inferior stops for real. |
3411 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
3412 | ||
3413 | STOP_PRINT_FRAME nonzero means print the executing frame | |
3414 | (pc, function, args, file, line number and line text). | |
3415 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
3416 | attempting to insert breakpoints. */ | |
3417 | ||
3418 | void | |
96baa820 | 3419 | normal_stop (void) |
c906108c | 3420 | { |
c906108c SS |
3421 | /* As with the notification of thread events, we want to delay |
3422 | notifying the user that we've switched thread context until | |
3423 | the inferior actually stops. | |
3424 | ||
3425 | (Note that there's no point in saying anything if the inferior | |
3426 | has exited!) */ | |
39f77062 | 3427 | if (! ptid_equal (previous_inferior_ptid, inferior_ptid) |
7a292a7a | 3428 | && target_has_execution) |
c906108c SS |
3429 | { |
3430 | target_terminal_ours_for_output (); | |
c3f6f71d | 3431 | printf_filtered ("[Switching to %s]\n", |
39f77062 KB |
3432 | target_pid_or_tid_to_str (inferior_ptid)); |
3433 | previous_inferior_ptid = inferior_ptid; | |
c906108c | 3434 | } |
c906108c SS |
3435 | |
3436 | /* Make sure that the current_frame's pc is correct. This | |
3437 | is a correction for setting up the frame info before doing | |
3438 | DECR_PC_AFTER_BREAK */ | |
3439 | if (target_has_execution && get_current_frame ()) | |
3440 | (get_current_frame ())->pc = read_pc (); | |
3441 | ||
3442 | if (breakpoints_failed) | |
3443 | { | |
3444 | target_terminal_ours_for_output (); | |
010a3cd9 | 3445 | print_sys_errmsg ("While inserting breakpoints", breakpoints_failed); |
c906108c | 3446 | printf_filtered ("Stopped; cannot insert breakpoints.\n\ |
010a3cd9 EZ |
3447 | The same program may be running in another process,\n\ |
3448 | or you may have requested too many hardware breakpoints\n\ | |
3449 | and/or watchpoints.\n"); | |
c906108c SS |
3450 | } |
3451 | ||
3452 | if (target_has_execution && breakpoints_inserted) | |
3453 | { | |
3454 | if (remove_breakpoints ()) | |
3455 | { | |
3456 | target_terminal_ours_for_output (); | |
3457 | printf_filtered ("Cannot remove breakpoints because "); | |
3458 | printf_filtered ("program is no longer writable.\n"); | |
3459 | printf_filtered ("It might be running in another process.\n"); | |
3460 | printf_filtered ("Further execution is probably impossible.\n"); | |
3461 | } | |
3462 | } | |
3463 | breakpoints_inserted = 0; | |
3464 | ||
3465 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3466 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3467 | ||
3468 | breakpoint_auto_delete (stop_bpstat); | |
3469 | ||
3470 | /* If an auto-display called a function and that got a signal, | |
3471 | delete that auto-display to avoid an infinite recursion. */ | |
3472 | ||
3473 | if (stopped_by_random_signal) | |
3474 | disable_current_display (); | |
3475 | ||
3476 | /* Don't print a message if in the middle of doing a "step n" | |
3477 | operation for n > 1 */ | |
3478 | if (step_multi && stop_step) | |
3479 | goto done; | |
3480 | ||
3481 | target_terminal_ours (); | |
3482 | ||
c906108c SS |
3483 | /* Look up the hook_stop and run it if it exists. */ |
3484 | ||
73bc900d | 3485 | if (stop_command && stop_command->hook_pre) |
c906108c | 3486 | { |
73bc900d | 3487 | catch_errors (hook_stop_stub, stop_command->hook_pre, |
c906108c SS |
3488 | "Error while running hook_stop:\n", RETURN_MASK_ALL); |
3489 | } | |
3490 | ||
3491 | if (!target_has_stack) | |
3492 | { | |
3493 | ||
3494 | goto done; | |
3495 | } | |
3496 | ||
3497 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3498 | and current location is based on that. | |
3499 | Don't do this on return from a stack dummy routine, | |
3500 | or if the program has exited. */ | |
3501 | ||
3502 | if (!stop_stack_dummy) | |
3503 | { | |
3504 | select_frame (get_current_frame (), 0); | |
3505 | ||
3506 | /* Print current location without a level number, if | |
c5aa993b JM |
3507 | we have changed functions or hit a breakpoint. |
3508 | Print source line if we have one. | |
3509 | bpstat_print() contains the logic deciding in detail | |
3510 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3511 | |
d082b2bb AC |
3512 | if (stop_print_frame |
3513 | && selected_frame) | |
c906108c SS |
3514 | { |
3515 | int bpstat_ret; | |
3516 | int source_flag; | |
917317f4 | 3517 | int do_frame_printing = 1; |
c906108c SS |
3518 | |
3519 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3520 | switch (bpstat_ret) |
3521 | { | |
3522 | case PRINT_UNKNOWN: | |
3523 | if (stop_step | |
3524 | && step_frame_address == FRAME_FP (get_current_frame ()) | |
3525 | && step_start_function == find_pc_function (stop_pc)) | |
c5394b80 | 3526 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3527 | else |
c5394b80 | 3528 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3529 | break; |
3530 | case PRINT_SRC_AND_LOC: | |
c5394b80 | 3531 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3532 | break; |
3533 | case PRINT_SRC_ONLY: | |
c5394b80 | 3534 | source_flag = SRC_LINE; |
917317f4 JM |
3535 | break; |
3536 | case PRINT_NOTHING: | |
88665544 | 3537 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3538 | do_frame_printing = 0; |
3539 | break; | |
3540 | default: | |
8e65ff28 AC |
3541 | internal_error (__FILE__, __LINE__, |
3542 | "Unknown value."); | |
917317f4 | 3543 | } |
fb40c209 AC |
3544 | #ifdef UI_OUT |
3545 | /* For mi, have the same behavior every time we stop: | |
3546 | print everything but the source line. */ | |
9dc5e2a9 | 3547 | if (ui_out_is_mi_like_p (uiout)) |
fb40c209 AC |
3548 | source_flag = LOC_AND_ADDRESS; |
3549 | #endif | |
c906108c | 3550 | |
fb40c209 | 3551 | #ifdef UI_OUT |
9dc5e2a9 | 3552 | if (ui_out_is_mi_like_p (uiout)) |
39f77062 KB |
3553 | ui_out_field_int (uiout, "thread-id", |
3554 | pid_to_thread_id (inferior_ptid)); | |
fb40c209 | 3555 | #endif |
c906108c SS |
3556 | /* The behavior of this routine with respect to the source |
3557 | flag is: | |
c5394b80 JM |
3558 | SRC_LINE: Print only source line |
3559 | LOCATION: Print only location | |
3560 | SRC_AND_LOC: Print location and source line */ | |
917317f4 JM |
3561 | if (do_frame_printing) |
3562 | show_and_print_stack_frame (selected_frame, -1, source_flag); | |
c906108c SS |
3563 | |
3564 | /* Display the auto-display expressions. */ | |
3565 | do_displays (); | |
3566 | } | |
3567 | } | |
3568 | ||
3569 | /* Save the function value return registers, if we care. | |
3570 | We might be about to restore their previous contents. */ | |
3571 | if (proceed_to_finish) | |
3572 | read_register_bytes (0, stop_registers, REGISTER_BYTES); | |
3573 | ||
3574 | if (stop_stack_dummy) | |
3575 | { | |
3576 | /* Pop the empty frame that contains the stack dummy. | |
3577 | POP_FRAME ends with a setting of the current frame, so we | |
c5aa993b | 3578 | can use that next. */ |
c906108c SS |
3579 | POP_FRAME; |
3580 | /* Set stop_pc to what it was before we called the function. | |
c5aa993b JM |
3581 | Can't rely on restore_inferior_status because that only gets |
3582 | called if we don't stop in the called function. */ | |
c906108c SS |
3583 | stop_pc = read_pc (); |
3584 | select_frame (get_current_frame (), 0); | |
3585 | } | |
3586 | ||
c906108c SS |
3587 | done: |
3588 | annotate_stopped (); | |
3589 | } | |
3590 | ||
3591 | static int | |
96baa820 | 3592 | hook_stop_stub (void *cmd) |
c906108c SS |
3593 | { |
3594 | execute_user_command ((struct cmd_list_element *) cmd, 0); | |
3595 | return (0); | |
3596 | } | |
3597 | \f | |
c5aa993b | 3598 | int |
96baa820 | 3599 | signal_stop_state (int signo) |
c906108c SS |
3600 | { |
3601 | return signal_stop[signo]; | |
3602 | } | |
3603 | ||
c5aa993b | 3604 | int |
96baa820 | 3605 | signal_print_state (int signo) |
c906108c SS |
3606 | { |
3607 | return signal_print[signo]; | |
3608 | } | |
3609 | ||
c5aa993b | 3610 | int |
96baa820 | 3611 | signal_pass_state (int signo) |
c906108c SS |
3612 | { |
3613 | return signal_program[signo]; | |
3614 | } | |
3615 | ||
d4f3574e SS |
3616 | int signal_stop_update (signo, state) |
3617 | int signo; | |
3618 | int state; | |
3619 | { | |
3620 | int ret = signal_stop[signo]; | |
3621 | signal_stop[signo] = state; | |
3622 | return ret; | |
3623 | } | |
3624 | ||
3625 | int signal_print_update (signo, state) | |
3626 | int signo; | |
3627 | int state; | |
3628 | { | |
3629 | int ret = signal_print[signo]; | |
3630 | signal_print[signo] = state; | |
3631 | return ret; | |
3632 | } | |
3633 | ||
3634 | int signal_pass_update (signo, state) | |
3635 | int signo; | |
3636 | int state; | |
3637 | { | |
3638 | int ret = signal_program[signo]; | |
3639 | signal_program[signo] = state; | |
3640 | return ret; | |
3641 | } | |
3642 | ||
c906108c | 3643 | static void |
96baa820 | 3644 | sig_print_header (void) |
c906108c SS |
3645 | { |
3646 | printf_filtered ("\ | |
3647 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3648 | } | |
3649 | ||
3650 | static void | |
96baa820 | 3651 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3652 | { |
3653 | char *name = target_signal_to_name (oursig); | |
3654 | int name_padding = 13 - strlen (name); | |
96baa820 | 3655 | |
c906108c SS |
3656 | if (name_padding <= 0) |
3657 | name_padding = 0; | |
3658 | ||
3659 | printf_filtered ("%s", name); | |
3660 | printf_filtered ("%*.*s ", name_padding, name_padding, | |
3661 | " "); | |
3662 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); | |
3663 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3664 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3665 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3666 | } | |
3667 | ||
3668 | /* Specify how various signals in the inferior should be handled. */ | |
3669 | ||
3670 | static void | |
96baa820 | 3671 | handle_command (char *args, int from_tty) |
c906108c SS |
3672 | { |
3673 | char **argv; | |
3674 | int digits, wordlen; | |
3675 | int sigfirst, signum, siglast; | |
3676 | enum target_signal oursig; | |
3677 | int allsigs; | |
3678 | int nsigs; | |
3679 | unsigned char *sigs; | |
3680 | struct cleanup *old_chain; | |
3681 | ||
3682 | if (args == NULL) | |
3683 | { | |
3684 | error_no_arg ("signal to handle"); | |
3685 | } | |
3686 | ||
3687 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3688 | ||
3689 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3690 | sigs = (unsigned char *) alloca (nsigs); | |
3691 | memset (sigs, 0, nsigs); | |
3692 | ||
3693 | /* Break the command line up into args. */ | |
3694 | ||
3695 | argv = buildargv (args); | |
3696 | if (argv == NULL) | |
3697 | { | |
3698 | nomem (0); | |
3699 | } | |
7a292a7a | 3700 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3701 | |
3702 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3703 | actions. Signal numbers and signal names may be interspersed with | |
3704 | actions, with the actions being performed for all signals cumulatively | |
3705 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3706 | ||
3707 | while (*argv != NULL) | |
3708 | { | |
3709 | wordlen = strlen (*argv); | |
3710 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3711 | {; | |
3712 | } | |
3713 | allsigs = 0; | |
3714 | sigfirst = siglast = -1; | |
3715 | ||
3716 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3717 | { | |
3718 | /* Apply action to all signals except those used by the | |
3719 | debugger. Silently skip those. */ | |
3720 | allsigs = 1; | |
3721 | sigfirst = 0; | |
3722 | siglast = nsigs - 1; | |
3723 | } | |
3724 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3725 | { | |
3726 | SET_SIGS (nsigs, sigs, signal_stop); | |
3727 | SET_SIGS (nsigs, sigs, signal_print); | |
3728 | } | |
3729 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3730 | { | |
3731 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3732 | } | |
3733 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3734 | { | |
3735 | SET_SIGS (nsigs, sigs, signal_print); | |
3736 | } | |
3737 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3738 | { | |
3739 | SET_SIGS (nsigs, sigs, signal_program); | |
3740 | } | |
3741 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3742 | { | |
3743 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3744 | } | |
3745 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3746 | { | |
3747 | SET_SIGS (nsigs, sigs, signal_program); | |
3748 | } | |
3749 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3750 | { | |
3751 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3752 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3753 | } | |
3754 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3755 | { | |
3756 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3757 | } | |
3758 | else if (digits > 0) | |
3759 | { | |
3760 | /* It is numeric. The numeric signal refers to our own | |
3761 | internal signal numbering from target.h, not to host/target | |
3762 | signal number. This is a feature; users really should be | |
3763 | using symbolic names anyway, and the common ones like | |
3764 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3765 | ||
3766 | sigfirst = siglast = (int) | |
3767 | target_signal_from_command (atoi (*argv)); | |
3768 | if ((*argv)[digits] == '-') | |
3769 | { | |
3770 | siglast = (int) | |
3771 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3772 | } | |
3773 | if (sigfirst > siglast) | |
3774 | { | |
3775 | /* Bet he didn't figure we'd think of this case... */ | |
3776 | signum = sigfirst; | |
3777 | sigfirst = siglast; | |
3778 | siglast = signum; | |
3779 | } | |
3780 | } | |
3781 | else | |
3782 | { | |
3783 | oursig = target_signal_from_name (*argv); | |
3784 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3785 | { | |
3786 | sigfirst = siglast = (int) oursig; | |
3787 | } | |
3788 | else | |
3789 | { | |
3790 | /* Not a number and not a recognized flag word => complain. */ | |
3791 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3792 | } | |
3793 | } | |
3794 | ||
3795 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3796 | which signals to apply actions to. */ |
c906108c SS |
3797 | |
3798 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3799 | { | |
3800 | switch ((enum target_signal) signum) | |
3801 | { | |
3802 | case TARGET_SIGNAL_TRAP: | |
3803 | case TARGET_SIGNAL_INT: | |
3804 | if (!allsigs && !sigs[signum]) | |
3805 | { | |
3806 | if (query ("%s is used by the debugger.\n\ | |
3807 | Are you sure you want to change it? ", | |
3808 | target_signal_to_name | |
3809 | ((enum target_signal) signum))) | |
3810 | { | |
3811 | sigs[signum] = 1; | |
3812 | } | |
3813 | else | |
3814 | { | |
3815 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3816 | gdb_flush (gdb_stdout); | |
3817 | } | |
3818 | } | |
3819 | break; | |
3820 | case TARGET_SIGNAL_0: | |
3821 | case TARGET_SIGNAL_DEFAULT: | |
3822 | case TARGET_SIGNAL_UNKNOWN: | |
3823 | /* Make sure that "all" doesn't print these. */ | |
3824 | break; | |
3825 | default: | |
3826 | sigs[signum] = 1; | |
3827 | break; | |
3828 | } | |
3829 | } | |
3830 | ||
3831 | argv++; | |
3832 | } | |
3833 | ||
39f77062 | 3834 | target_notice_signals (inferior_ptid); |
c906108c SS |
3835 | |
3836 | if (from_tty) | |
3837 | { | |
3838 | /* Show the results. */ | |
3839 | sig_print_header (); | |
3840 | for (signum = 0; signum < nsigs; signum++) | |
3841 | { | |
3842 | if (sigs[signum]) | |
3843 | { | |
3844 | sig_print_info (signum); | |
3845 | } | |
3846 | } | |
3847 | } | |
3848 | ||
3849 | do_cleanups (old_chain); | |
3850 | } | |
3851 | ||
3852 | static void | |
96baa820 | 3853 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3854 | { |
3855 | char **argv; | |
3856 | struct cleanup *old_chain; | |
3857 | ||
3858 | /* Break the command line up into args. */ | |
3859 | ||
3860 | argv = buildargv (args); | |
3861 | if (argv == NULL) | |
3862 | { | |
3863 | nomem (0); | |
3864 | } | |
7a292a7a | 3865 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3866 | if (argv[1] != (char *) NULL) |
3867 | { | |
3868 | char *argBuf; | |
3869 | int bufLen; | |
3870 | ||
3871 | bufLen = strlen (argv[0]) + 20; | |
3872 | argBuf = (char *) xmalloc (bufLen); | |
3873 | if (argBuf) | |
3874 | { | |
3875 | int validFlag = 1; | |
3876 | enum target_signal oursig; | |
3877 | ||
3878 | oursig = target_signal_from_name (argv[0]); | |
3879 | memset (argBuf, 0, bufLen); | |
3880 | if (strcmp (argv[1], "Q") == 0) | |
3881 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3882 | else | |
3883 | { | |
3884 | if (strcmp (argv[1], "s") == 0) | |
3885 | { | |
3886 | if (!signal_stop[oursig]) | |
3887 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3888 | else | |
3889 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3890 | } | |
3891 | else if (strcmp (argv[1], "i") == 0) | |
3892 | { | |
3893 | if (!signal_program[oursig]) | |
3894 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3895 | else | |
3896 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3897 | } | |
3898 | else if (strcmp (argv[1], "r") == 0) | |
3899 | { | |
3900 | if (!signal_print[oursig]) | |
3901 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3902 | else | |
3903 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3904 | } | |
3905 | else | |
3906 | validFlag = 0; | |
3907 | } | |
3908 | if (validFlag) | |
3909 | handle_command (argBuf, from_tty); | |
3910 | else | |
3911 | printf_filtered ("Invalid signal handling flag.\n"); | |
3912 | if (argBuf) | |
b8c9b27d | 3913 | xfree (argBuf); |
c906108c SS |
3914 | } |
3915 | } | |
3916 | do_cleanups (old_chain); | |
3917 | } | |
3918 | ||
3919 | /* Print current contents of the tables set by the handle command. | |
3920 | It is possible we should just be printing signals actually used | |
3921 | by the current target (but for things to work right when switching | |
3922 | targets, all signals should be in the signal tables). */ | |
3923 | ||
3924 | static void | |
96baa820 | 3925 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3926 | { |
3927 | enum target_signal oursig; | |
3928 | sig_print_header (); | |
3929 | ||
3930 | if (signum_exp) | |
3931 | { | |
3932 | /* First see if this is a symbol name. */ | |
3933 | oursig = target_signal_from_name (signum_exp); | |
3934 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3935 | { | |
3936 | /* No, try numeric. */ | |
3937 | oursig = | |
bb518678 | 3938 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3939 | } |
3940 | sig_print_info (oursig); | |
3941 | return; | |
3942 | } | |
3943 | ||
3944 | printf_filtered ("\n"); | |
3945 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3946 | for (oursig = TARGET_SIGNAL_FIRST; | |
3947 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3948 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3949 | { | |
3950 | QUIT; | |
3951 | ||
3952 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
3953 | && oursig != TARGET_SIGNAL_DEFAULT | |
3954 | && oursig != TARGET_SIGNAL_0) | |
3955 | sig_print_info (oursig); | |
3956 | } | |
3957 | ||
3958 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3959 | } | |
3960 | \f | |
7a292a7a SS |
3961 | struct inferior_status |
3962 | { | |
3963 | enum target_signal stop_signal; | |
3964 | CORE_ADDR stop_pc; | |
3965 | bpstat stop_bpstat; | |
3966 | int stop_step; | |
3967 | int stop_stack_dummy; | |
3968 | int stopped_by_random_signal; | |
3969 | int trap_expected; | |
3970 | CORE_ADDR step_range_start; | |
3971 | CORE_ADDR step_range_end; | |
3972 | CORE_ADDR step_frame_address; | |
5fbbeb29 | 3973 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3974 | CORE_ADDR step_resume_break_address; |
3975 | int stop_after_trap; | |
3976 | int stop_soon_quietly; | |
3977 | CORE_ADDR selected_frame_address; | |
3978 | char *stop_registers; | |
3979 | ||
3980 | /* These are here because if call_function_by_hand has written some | |
3981 | registers and then decides to call error(), we better not have changed | |
3982 | any registers. */ | |
3983 | char *registers; | |
3984 | ||
3985 | int selected_level; | |
3986 | int breakpoint_proceeded; | |
3987 | int restore_stack_info; | |
3988 | int proceed_to_finish; | |
3989 | }; | |
3990 | ||
7a292a7a | 3991 | static struct inferior_status * |
96baa820 | 3992 | xmalloc_inferior_status (void) |
7a292a7a SS |
3993 | { |
3994 | struct inferior_status *inf_status; | |
3995 | inf_status = xmalloc (sizeof (struct inferior_status)); | |
3996 | inf_status->stop_registers = xmalloc (REGISTER_BYTES); | |
3997 | inf_status->registers = xmalloc (REGISTER_BYTES); | |
3998 | return inf_status; | |
3999 | } | |
4000 | ||
7a292a7a | 4001 | static void |
96baa820 | 4002 | free_inferior_status (struct inferior_status *inf_status) |
7a292a7a | 4003 | { |
b8c9b27d KB |
4004 | xfree (inf_status->registers); |
4005 | xfree (inf_status->stop_registers); | |
4006 | xfree (inf_status); | |
7a292a7a SS |
4007 | } |
4008 | ||
4009 | void | |
96baa820 JM |
4010 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
4011 | LONGEST val) | |
7a292a7a | 4012 | { |
c5aa993b | 4013 | int size = REGISTER_RAW_SIZE (regno); |
7a292a7a SS |
4014 | void *buf = alloca (size); |
4015 | store_signed_integer (buf, size, val); | |
4016 | memcpy (&inf_status->registers[REGISTER_BYTE (regno)], buf, size); | |
4017 | } | |
4018 | ||
c906108c SS |
4019 | /* Save all of the information associated with the inferior<==>gdb |
4020 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
4021 | (defined in inferior.h). */ | |
4022 | ||
7a292a7a | 4023 | struct inferior_status * |
96baa820 | 4024 | save_inferior_status (int restore_stack_info) |
c906108c | 4025 | { |
7a292a7a SS |
4026 | struct inferior_status *inf_status = xmalloc_inferior_status (); |
4027 | ||
c906108c SS |
4028 | inf_status->stop_signal = stop_signal; |
4029 | inf_status->stop_pc = stop_pc; | |
4030 | inf_status->stop_step = stop_step; | |
4031 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
4032 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
4033 | inf_status->trap_expected = trap_expected; | |
4034 | inf_status->step_range_start = step_range_start; | |
4035 | inf_status->step_range_end = step_range_end; | |
4036 | inf_status->step_frame_address = step_frame_address; | |
4037 | inf_status->step_over_calls = step_over_calls; | |
4038 | inf_status->stop_after_trap = stop_after_trap; | |
4039 | inf_status->stop_soon_quietly = stop_soon_quietly; | |
4040 | /* Save original bpstat chain here; replace it with copy of chain. | |
4041 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
4042 | hand them back the original chain when restore_inferior_status is |
4043 | called. */ | |
c906108c SS |
4044 | inf_status->stop_bpstat = stop_bpstat; |
4045 | stop_bpstat = bpstat_copy (stop_bpstat); | |
4046 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
4047 | inf_status->restore_stack_info = restore_stack_info; | |
4048 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 4049 | |
c906108c SS |
4050 | memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES); |
4051 | ||
4052 | read_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
4053 | ||
4054 | record_selected_frame (&(inf_status->selected_frame_address), | |
4055 | &(inf_status->selected_level)); | |
7a292a7a | 4056 | return inf_status; |
c906108c SS |
4057 | } |
4058 | ||
4059 | struct restore_selected_frame_args | |
4060 | { | |
4061 | CORE_ADDR frame_address; | |
4062 | int level; | |
4063 | }; | |
4064 | ||
c906108c | 4065 | static int |
96baa820 | 4066 | restore_selected_frame (void *args) |
c906108c SS |
4067 | { |
4068 | struct restore_selected_frame_args *fr = | |
4069 | (struct restore_selected_frame_args *) args; | |
4070 | struct frame_info *frame; | |
4071 | int level = fr->level; | |
4072 | ||
4073 | frame = find_relative_frame (get_current_frame (), &level); | |
4074 | ||
4075 | /* If inf_status->selected_frame_address is NULL, there was no | |
4076 | previously selected frame. */ | |
4077 | if (frame == NULL || | |
4078 | /* FRAME_FP (frame) != fr->frame_address || */ | |
4079 | /* elz: deleted this check as a quick fix to the problem that | |
c5aa993b JM |
4080 | for function called by hand gdb creates no internal frame |
4081 | structure and the real stack and gdb's idea of stack are | |
4082 | different if nested calls by hands are made. | |
c906108c | 4083 | |
c5aa993b | 4084 | mvs: this worries me. */ |
c906108c SS |
4085 | level != 0) |
4086 | { | |
4087 | warning ("Unable to restore previously selected frame.\n"); | |
4088 | return 0; | |
4089 | } | |
4090 | ||
4091 | select_frame (frame, fr->level); | |
4092 | ||
4093 | return (1); | |
4094 | } | |
4095 | ||
4096 | void | |
96baa820 | 4097 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
4098 | { |
4099 | stop_signal = inf_status->stop_signal; | |
4100 | stop_pc = inf_status->stop_pc; | |
4101 | stop_step = inf_status->stop_step; | |
4102 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
4103 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
4104 | trap_expected = inf_status->trap_expected; | |
4105 | step_range_start = inf_status->step_range_start; | |
4106 | step_range_end = inf_status->step_range_end; | |
4107 | step_frame_address = inf_status->step_frame_address; | |
4108 | step_over_calls = inf_status->step_over_calls; | |
4109 | stop_after_trap = inf_status->stop_after_trap; | |
4110 | stop_soon_quietly = inf_status->stop_soon_quietly; | |
4111 | bpstat_clear (&stop_bpstat); | |
4112 | stop_bpstat = inf_status->stop_bpstat; | |
4113 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
4114 | proceed_to_finish = inf_status->proceed_to_finish; | |
4115 | ||
7a292a7a | 4116 | /* FIXME: Is the restore of stop_registers always needed */ |
c906108c SS |
4117 | memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES); |
4118 | ||
4119 | /* The inferior can be gone if the user types "print exit(0)" | |
4120 | (and perhaps other times). */ | |
4121 | if (target_has_execution) | |
4122 | write_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
4123 | ||
c906108c SS |
4124 | /* FIXME: If we are being called after stopping in a function which |
4125 | is called from gdb, we should not be trying to restore the | |
4126 | selected frame; it just prints a spurious error message (The | |
4127 | message is useful, however, in detecting bugs in gdb (like if gdb | |
4128 | clobbers the stack)). In fact, should we be restoring the | |
4129 | inferior status at all in that case? . */ | |
4130 | ||
4131 | if (target_has_stack && inf_status->restore_stack_info) | |
4132 | { | |
4133 | struct restore_selected_frame_args fr; | |
4134 | fr.level = inf_status->selected_level; | |
4135 | fr.frame_address = inf_status->selected_frame_address; | |
4136 | /* The point of catch_errors is that if the stack is clobbered, | |
c5aa993b JM |
4137 | walking the stack might encounter a garbage pointer and error() |
4138 | trying to dereference it. */ | |
c906108c SS |
4139 | if (catch_errors (restore_selected_frame, &fr, |
4140 | "Unable to restore previously selected frame:\n", | |
4141 | RETURN_MASK_ERROR) == 0) | |
4142 | /* Error in restoring the selected frame. Select the innermost | |
4143 | frame. */ | |
4144 | ||
4145 | ||
4146 | select_frame (get_current_frame (), 0); | |
4147 | ||
4148 | } | |
c906108c | 4149 | |
7a292a7a SS |
4150 | free_inferior_status (inf_status); |
4151 | } | |
c906108c | 4152 | |
74b7792f AC |
4153 | static void |
4154 | do_restore_inferior_status_cleanup (void *sts) | |
4155 | { | |
4156 | restore_inferior_status (sts); | |
4157 | } | |
4158 | ||
4159 | struct cleanup * | |
4160 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
4161 | { | |
4162 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
4163 | } | |
4164 | ||
c906108c | 4165 | void |
96baa820 | 4166 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
4167 | { |
4168 | /* See save_inferior_status for info on stop_bpstat. */ | |
4169 | bpstat_clear (&inf_status->stop_bpstat); | |
4170 | free_inferior_status (inf_status); | |
4171 | } | |
4172 | ||
ca6724c1 KB |
4173 | /* Oft used ptids */ |
4174 | ptid_t null_ptid; | |
4175 | ptid_t minus_one_ptid; | |
4176 | ||
4177 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
4178 | ||
4179 | ptid_t | |
4180 | ptid_build (int pid, long lwp, long tid) | |
4181 | { | |
4182 | ptid_t ptid; | |
4183 | ||
4184 | ptid.pid = pid; | |
4185 | ptid.lwp = lwp; | |
4186 | ptid.tid = tid; | |
4187 | return ptid; | |
4188 | } | |
4189 | ||
4190 | /* Create a ptid from just a pid. */ | |
4191 | ||
4192 | ptid_t | |
4193 | pid_to_ptid (int pid) | |
4194 | { | |
4195 | return ptid_build (pid, 0, 0); | |
4196 | } | |
4197 | ||
4198 | /* Fetch the pid (process id) component from a ptid. */ | |
4199 | ||
4200 | int | |
4201 | ptid_get_pid (ptid_t ptid) | |
4202 | { | |
4203 | return ptid.pid; | |
4204 | } | |
4205 | ||
4206 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
4207 | ||
4208 | long | |
4209 | ptid_get_lwp (ptid_t ptid) | |
4210 | { | |
4211 | return ptid.lwp; | |
4212 | } | |
4213 | ||
4214 | /* Fetch the tid (thread id) component from a ptid. */ | |
4215 | ||
4216 | long | |
4217 | ptid_get_tid (ptid_t ptid) | |
4218 | { | |
4219 | return ptid.tid; | |
4220 | } | |
4221 | ||
4222 | /* ptid_equal() is used to test equality of two ptids. */ | |
4223 | ||
4224 | int | |
4225 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
4226 | { | |
4227 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
4228 | && ptid1.tid == ptid2.tid); | |
4229 | } | |
4230 | ||
4231 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
4232 | to restore the inferior_ptid value saved in a call to | |
4233 | save_inferior_ptid(). */ | |
ce696e05 KB |
4234 | |
4235 | static void | |
4236 | restore_inferior_ptid (void *arg) | |
4237 | { | |
4238 | ptid_t *saved_ptid_ptr = arg; | |
4239 | inferior_ptid = *saved_ptid_ptr; | |
4240 | xfree (arg); | |
4241 | } | |
4242 | ||
4243 | /* Save the value of inferior_ptid so that it may be restored by a | |
4244 | later call to do_cleanups(). Returns the struct cleanup pointer | |
4245 | needed for later doing the cleanup. */ | |
4246 | ||
4247 | struct cleanup * | |
4248 | save_inferior_ptid (void) | |
4249 | { | |
4250 | ptid_t *saved_ptid_ptr; | |
4251 | ||
4252 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
4253 | *saved_ptid_ptr = inferior_ptid; | |
4254 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
4255 | } | |
4256 | ||
c5aa993b | 4257 | \f |
7a292a7a | 4258 | static void |
96baa820 | 4259 | build_infrun (void) |
7a292a7a SS |
4260 | { |
4261 | stop_registers = xmalloc (REGISTER_BYTES); | |
4262 | } | |
c906108c | 4263 | |
c906108c | 4264 | void |
96baa820 | 4265 | _initialize_infrun (void) |
c906108c SS |
4266 | { |
4267 | register int i; | |
4268 | register int numsigs; | |
4269 | struct cmd_list_element *c; | |
4270 | ||
7a292a7a SS |
4271 | build_infrun (); |
4272 | ||
0f71a2f6 JM |
4273 | register_gdbarch_swap (&stop_registers, sizeof (stop_registers), NULL); |
4274 | register_gdbarch_swap (NULL, 0, build_infrun); | |
4275 | ||
c906108c SS |
4276 | add_info ("signals", signals_info, |
4277 | "What debugger does when program gets various signals.\n\ | |
4278 | Specify a signal as argument to print info on that signal only."); | |
4279 | add_info_alias ("handle", "signals", 0); | |
4280 | ||
4281 | add_com ("handle", class_run, handle_command, | |
4282 | concat ("Specify how to handle a signal.\n\ | |
4283 | Args are signals and actions to apply to those signals.\n\ | |
4284 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
4285 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
4286 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
4287 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
4288 | used by the debugger, typically SIGTRAP and SIGINT.\n", | |
4289 | "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
4290 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ | |
4291 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
4292 | Print means print a message if this signal happens.\n\ | |
4293 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
4294 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
4295 | Pass and Stop may be combined.", NULL)); | |
4296 | if (xdb_commands) | |
4297 | { | |
4298 | add_com ("lz", class_info, signals_info, | |
4299 | "What debugger does when program gets various signals.\n\ | |
4300 | Specify a signal as argument to print info on that signal only."); | |
4301 | add_com ("z", class_run, xdb_handle_command, | |
4302 | concat ("Specify how to handle a signal.\n\ | |
4303 | Args are signals and actions to apply to those signals.\n\ | |
4304 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
4305 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
4306 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
4307 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
4308 | used by the debugger, typically SIGTRAP and SIGINT.\n", | |
4309 | "Recognized actions include \"s\" (toggles between stop and nostop), \n\ | |
4310 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ | |
4311 | nopass), \"Q\" (noprint)\n\ | |
4312 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
4313 | Print means print a message if this signal happens.\n\ | |
4314 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
4315 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
4316 | Pass and Stop may be combined.", NULL)); | |
4317 | } | |
4318 | ||
4319 | if (!dbx_commands) | |
4320 | stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command, | |
4321 | "There is no `stop' command, but you can set a hook on `stop'.\n\ | |
4322 | This allows you to set a list of commands to be run each time execution\n\ | |
4323 | of the program stops.", &cmdlist); | |
4324 | ||
4325 | numsigs = (int) TARGET_SIGNAL_LAST; | |
4326 | signal_stop = (unsigned char *) | |
4327 | xmalloc (sizeof (signal_stop[0]) * numsigs); | |
4328 | signal_print = (unsigned char *) | |
4329 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
4330 | signal_program = (unsigned char *) | |
4331 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
4332 | for (i = 0; i < numsigs; i++) | |
4333 | { | |
4334 | signal_stop[i] = 1; | |
4335 | signal_print[i] = 1; | |
4336 | signal_program[i] = 1; | |
4337 | } | |
4338 | ||
4339 | /* Signals caused by debugger's own actions | |
4340 | should not be given to the program afterwards. */ | |
4341 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
4342 | signal_program[TARGET_SIGNAL_INT] = 0; | |
4343 | ||
4344 | /* Signals that are not errors should not normally enter the debugger. */ | |
4345 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
4346 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
4347 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
4348 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
4349 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
4350 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
4351 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
4352 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
4353 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
4354 | signal_print[TARGET_SIGNAL_IO] = 0; | |
4355 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
4356 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
4357 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
4358 | signal_print[TARGET_SIGNAL_URG] = 0; | |
4359 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
4360 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
4361 | ||
cd0fc7c3 SS |
4362 | /* These signals are used internally by user-level thread |
4363 | implementations. (See signal(5) on Solaris.) Like the above | |
4364 | signals, a healthy program receives and handles them as part of | |
4365 | its normal operation. */ | |
4366 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
4367 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
4368 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
4369 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
4370 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
4371 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
4372 | ||
c906108c SS |
4373 | #ifdef SOLIB_ADD |
4374 | add_show_from_set | |
4375 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, | |
4376 | (char *) &stop_on_solib_events, | |
4377 | "Set stopping for shared library events.\n\ | |
4378 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
4379 | notifies gdb of shared library events. The most common event of interest\n\ | |
4380 | to the user would be loading/unloading of a new library.\n", | |
4381 | &setlist), | |
4382 | &showlist); | |
4383 | #endif | |
4384 | ||
4385 | c = add_set_enum_cmd ("follow-fork-mode", | |
4386 | class_run, | |
4387 | follow_fork_mode_kind_names, | |
1ed2a135 | 4388 | &follow_fork_mode_string, |
c906108c SS |
4389 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 |
4390 | kernel problem. It's also not terribly useful without a GUI to | |
4391 | help the user drive two debuggers. So for now, I'm disabling | |
4392 | the "both" option. */ | |
c5aa993b JM |
4393 | /* "Set debugger response to a program call of fork \ |
4394 | or vfork.\n\ | |
4395 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
4396 | parent - the original process is debugged after a fork\n\ | |
4397 | child - the new process is debugged after a fork\n\ | |
4398 | both - both the parent and child are debugged after a fork\n\ | |
4399 | ask - the debugger will ask for one of the above choices\n\ | |
4400 | For \"both\", another copy of the debugger will be started to follow\n\ | |
4401 | the new child process. The original debugger will continue to follow\n\ | |
4402 | the original parent process. To distinguish their prompts, the\n\ | |
4403 | debugger copy's prompt will be changed.\n\ | |
4404 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
4405 | By default, the debugger will follow the parent process.", | |
4406 | */ | |
c906108c SS |
4407 | "Set debugger response to a program call of fork \ |
4408 | or vfork.\n\ | |
4409 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
4410 | parent - the original process is debugged after a fork\n\ | |
4411 | child - the new process is debugged after a fork\n\ | |
4412 | ask - the debugger will ask for one of the above choices\n\ | |
4413 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
4414 | By default, the debugger will follow the parent process.", | |
4415 | &setlist); | |
c5aa993b | 4416 | /* c->function.sfunc = ; */ |
c906108c SS |
4417 | add_show_from_set (c, &showlist); |
4418 | ||
c906108c SS |
4419 | c = add_set_enum_cmd ("scheduler-locking", class_run, |
4420 | scheduler_enums, /* array of string names */ | |
1ed2a135 | 4421 | &scheduler_mode, /* current mode */ |
c906108c SS |
4422 | "Set mode for locking scheduler during execution.\n\ |
4423 | off == no locking (threads may preempt at any time)\n\ | |
4424 | on == full locking (no thread except the current thread may run)\n\ | |
4425 | step == scheduler locked during every single-step operation.\n\ | |
4426 | In this mode, no other thread may run during a step command.\n\ | |
4427 | Other threads may run while stepping over a function call ('next').", | |
4428 | &setlist); | |
4429 | ||
4430 | c->function.sfunc = set_schedlock_func; /* traps on target vector */ | |
4431 | add_show_from_set (c, &showlist); | |
5fbbeb29 CF |
4432 | |
4433 | c = add_set_cmd ("step-mode", class_run, | |
4434 | var_boolean, (char*) &step_stop_if_no_debug, | |
4435 | "Set mode of the step operation. When set, doing a step over a\n\ | |
4436 | function without debug line information will stop at the first\n\ | |
4437 | instruction of that function. Otherwise, the function is skipped and\n\ | |
4438 | the step command stops at a different source line.", | |
4439 | &setlist); | |
4440 | add_show_from_set (c, &showlist); | |
ca6724c1 KB |
4441 | |
4442 | /* ptid initializations */ | |
4443 | null_ptid = ptid_build (0, 0, 0); | |
4444 | minus_one_ptid = ptid_build (-1, 0, 0); | |
4445 | inferior_ptid = null_ptid; | |
4446 | target_last_wait_ptid = minus_one_ptid; | |
c906108c | 4447 | } |