Commit | Line | Data |
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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" | |
32 | #include "target.h" | |
33 | #include "gdbthread.h" | |
34 | #include "annotate.h" | |
1adeb98a | 35 | #include "symfile.h" |
7a292a7a | 36 | #include "top.h" |
c906108c | 37 | #include <signal.h> |
2acceee2 | 38 | #include "inf-loop.h" |
4e052eda | 39 | #include "regcache.h" |
c906108c SS |
40 | |
41 | /* Prototypes for local functions */ | |
42 | ||
96baa820 | 43 | static void signals_info (char *, int); |
c906108c | 44 | |
96baa820 | 45 | static void handle_command (char *, int); |
c906108c | 46 | |
96baa820 | 47 | static void sig_print_info (enum target_signal); |
c906108c | 48 | |
96baa820 | 49 | static void sig_print_header (void); |
c906108c | 50 | |
74b7792f | 51 | static void resume_cleanups (void *); |
c906108c | 52 | |
96baa820 | 53 | static int hook_stop_stub (void *); |
c906108c | 54 | |
96baa820 | 55 | static void delete_breakpoint_current_contents (void *); |
c906108c | 56 | |
96baa820 JM |
57 | static void set_follow_fork_mode_command (char *arg, int from_tty, |
58 | struct cmd_list_element * c); | |
7a292a7a | 59 | |
96baa820 JM |
60 | static struct inferior_status *xmalloc_inferior_status (void); |
61 | ||
62 | static void free_inferior_status (struct inferior_status *); | |
63 | ||
64 | static int restore_selected_frame (void *); | |
65 | ||
66 | static void build_infrun (void); | |
67 | ||
68 | static void follow_inferior_fork (int parent_pid, int child_pid, | |
69 | int has_forked, int has_vforked); | |
70 | ||
71 | static void follow_fork (int parent_pid, int child_pid); | |
72 | ||
73 | static void follow_vfork (int parent_pid, int child_pid); | |
74 | ||
75 | static void set_schedlock_func (char *args, int from_tty, | |
76 | struct cmd_list_element * c); | |
77 | ||
96baa820 JM |
78 | struct execution_control_state; |
79 | ||
80 | static int currently_stepping (struct execution_control_state *ecs); | |
81 | ||
82 | static void xdb_handle_command (char *args, int from_tty); | |
83 | ||
84 | void _initialize_infrun (void); | |
43ff13b4 | 85 | |
c906108c SS |
86 | int inferior_ignoring_startup_exec_events = 0; |
87 | int inferior_ignoring_leading_exec_events = 0; | |
88 | ||
5fbbeb29 CF |
89 | /* When set, stop the 'step' command if we enter a function which has |
90 | no line number information. The normal behavior is that we step | |
91 | over such function. */ | |
92 | int step_stop_if_no_debug = 0; | |
93 | ||
43ff13b4 | 94 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 95 | |
43ff13b4 JM |
96 | int sync_execution = 0; |
97 | ||
c906108c SS |
98 | /* wait_for_inferior and normal_stop use this to notify the user |
99 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
100 | running in. */ |
101 | ||
c3f6f71d | 102 | static int previous_inferior_pid; |
7a292a7a SS |
103 | |
104 | /* This is true for configurations that may follow through execl() and | |
105 | similar functions. At present this is only true for HP-UX native. */ | |
106 | ||
107 | #ifndef MAY_FOLLOW_EXEC | |
108 | #define MAY_FOLLOW_EXEC (0) | |
c906108c SS |
109 | #endif |
110 | ||
7a292a7a SS |
111 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
112 | ||
c906108c SS |
113 | /* resume and wait_for_inferior use this to ensure that when |
114 | stepping over a hit breakpoint in a threaded application | |
115 | only the thread that hit the breakpoint is stepped and the | |
116 | other threads don't continue. This prevents having another | |
117 | thread run past the breakpoint while it is temporarily | |
118 | removed. | |
119 | ||
120 | This is not thread-specific, so it isn't saved as part of | |
121 | the infrun state. | |
122 | ||
123 | Versions of gdb which don't use the "step == this thread steps | |
124 | and others continue" model but instead use the "step == this | |
96baa820 JM |
125 | thread steps and others wait" shouldn't do this. */ |
126 | ||
c906108c SS |
127 | static int thread_step_needed = 0; |
128 | ||
7a292a7a SS |
129 | /* This is true if thread_step_needed should actually be used. At |
130 | present this is only true for HP-UX native. */ | |
131 | ||
132 | #ifndef USE_THREAD_STEP_NEEDED | |
133 | #define USE_THREAD_STEP_NEEDED (0) | |
134 | #endif | |
135 | ||
136 | static int use_thread_step_needed = USE_THREAD_STEP_NEEDED; | |
137 | ||
c906108c SS |
138 | /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the |
139 | program. It needs to examine the jmp_buf argument and extract the PC | |
140 | from it. The return value is non-zero on success, zero otherwise. */ | |
141 | ||
142 | #ifndef GET_LONGJMP_TARGET | |
143 | #define GET_LONGJMP_TARGET(PC_ADDR) 0 | |
144 | #endif | |
145 | ||
146 | ||
147 | /* Some machines have trampoline code that sits between function callers | |
148 | and the actual functions themselves. If this machine doesn't have | |
149 | such things, disable their processing. */ | |
150 | ||
151 | #ifndef SKIP_TRAMPOLINE_CODE | |
152 | #define SKIP_TRAMPOLINE_CODE(pc) 0 | |
153 | #endif | |
154 | ||
155 | /* Dynamic function trampolines are similar to solib trampolines in that they | |
156 | are between the caller and the callee. The difference is that when you | |
157 | enter a dynamic trampoline, you can't determine the callee's address. Some | |
158 | (usually complex) code needs to run in the dynamic trampoline to figure out | |
159 | the callee's address. This macro is usually called twice. First, when we | |
160 | enter the trampoline (looks like a normal function call at that point). It | |
161 | should return the PC of a point within the trampoline where the callee's | |
162 | address is known. Second, when we hit the breakpoint, this routine returns | |
163 | the callee's address. At that point, things proceed as per a step resume | |
164 | breakpoint. */ | |
165 | ||
166 | #ifndef DYNAMIC_TRAMPOLINE_NEXTPC | |
167 | #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0 | |
168 | #endif | |
169 | ||
d4f3574e SS |
170 | /* If the program uses ELF-style shared libraries, then calls to |
171 | functions in shared libraries go through stubs, which live in a | |
172 | table called the PLT (Procedure Linkage Table). The first time the | |
173 | function is called, the stub sends control to the dynamic linker, | |
174 | which looks up the function's real address, patches the stub so | |
175 | that future calls will go directly to the function, and then passes | |
176 | control to the function. | |
177 | ||
178 | If we are stepping at the source level, we don't want to see any of | |
179 | this --- we just want to skip over the stub and the dynamic linker. | |
180 | The simple approach is to single-step until control leaves the | |
181 | dynamic linker. | |
182 | ||
183 | However, on some systems (e.g., Red Hat Linux 5.2) the dynamic | |
184 | linker calls functions in the shared C library, so you can't tell | |
185 | from the PC alone whether the dynamic linker is still running. In | |
186 | this case, we use a step-resume breakpoint to get us past the | |
187 | dynamic linker, as if we were using "next" to step over a function | |
188 | call. | |
189 | ||
190 | IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic | |
191 | linker code or not. Normally, this means we single-step. However, | |
192 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
193 | address where we can place a step-resume breakpoint to get past the | |
194 | linker's symbol resolution function. | |
195 | ||
196 | IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a | |
197 | pretty portable way, by comparing the PC against the address ranges | |
198 | of the dynamic linker's sections. | |
199 | ||
200 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
201 | it depends on internal details of the dynamic linker. It's usually | |
202 | not too hard to figure out where to put a breakpoint, but it | |
203 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
204 | sanity checking. If it can't figure things out, returning zero and | |
205 | getting the (possibly confusing) stepping behavior is better than | |
206 | signalling an error, which will obscure the change in the | |
207 | inferior's state. */ | |
c906108c SS |
208 | |
209 | #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
210 | #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 | |
211 | #endif | |
212 | ||
d4f3574e SS |
213 | #ifndef SKIP_SOLIB_RESOLVER |
214 | #define SKIP_SOLIB_RESOLVER(pc) 0 | |
215 | #endif | |
216 | ||
c906108c SS |
217 | /* For SVR4 shared libraries, each call goes through a small piece of |
218 | trampoline code in the ".plt" section. IN_SOLIB_CALL_TRAMPOLINE evaluates | |
219 | to nonzero if we are current stopped in one of these. */ | |
220 | ||
221 | #ifndef IN_SOLIB_CALL_TRAMPOLINE | |
222 | #define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0 | |
223 | #endif | |
224 | ||
225 | /* In some shared library schemes, the return path from a shared library | |
226 | call may need to go through a trampoline too. */ | |
227 | ||
228 | #ifndef IN_SOLIB_RETURN_TRAMPOLINE | |
229 | #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0 | |
230 | #endif | |
231 | ||
232 | /* This function returns TRUE if pc is the address of an instruction | |
233 | that lies within the dynamic linker (such as the event hook, or the | |
234 | dld itself). | |
235 | ||
236 | This function must be used only when a dynamic linker event has | |
237 | been caught, and the inferior is being stepped out of the hook, or | |
238 | undefined results are guaranteed. */ | |
239 | ||
240 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
241 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
242 | #endif | |
243 | ||
244 | /* On MIPS16, a function that returns a floating point value may call | |
245 | a library helper function to copy the return value to a floating point | |
246 | register. The IGNORE_HELPER_CALL macro returns non-zero if we | |
247 | should ignore (i.e. step over) this function call. */ | |
248 | #ifndef IGNORE_HELPER_CALL | |
249 | #define IGNORE_HELPER_CALL(pc) 0 | |
250 | #endif | |
251 | ||
252 | /* On some systems, the PC may be left pointing at an instruction that won't | |
253 | actually be executed. This is usually indicated by a bit in the PSW. If | |
254 | we find ourselves in such a state, then we step the target beyond the | |
255 | nullified instruction before returning control to the user so as to avoid | |
256 | confusion. */ | |
257 | ||
258 | #ifndef INSTRUCTION_NULLIFIED | |
259 | #define INSTRUCTION_NULLIFIED 0 | |
260 | #endif | |
261 | ||
c2c6d25f JM |
262 | /* We can't step off a permanent breakpoint in the ordinary way, because we |
263 | can't remove it. Instead, we have to advance the PC to the next | |
264 | instruction. This macro should expand to a pointer to a function that | |
265 | does that, or zero if we have no such function. If we don't have a | |
266 | definition for it, we have to report an error. */ | |
267 | #ifndef SKIP_PERMANENT_BREAKPOINT | |
268 | #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint) | |
269 | static void | |
c2d11a7d | 270 | default_skip_permanent_breakpoint (void) |
c2c6d25f JM |
271 | { |
272 | error_begin (); | |
273 | fprintf_filtered (gdb_stderr, "\ | |
274 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
275 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
276 | a command like `return' or `jump' to continue execution.\n"); | |
277 | return_to_top_level (RETURN_ERROR); | |
278 | } | |
279 | #endif | |
280 | ||
281 | ||
7a292a7a SS |
282 | /* Convert the #defines into values. This is temporary until wfi control |
283 | flow is completely sorted out. */ | |
284 | ||
285 | #ifndef HAVE_STEPPABLE_WATCHPOINT | |
286 | #define HAVE_STEPPABLE_WATCHPOINT 0 | |
287 | #else | |
288 | #undef HAVE_STEPPABLE_WATCHPOINT | |
289 | #define HAVE_STEPPABLE_WATCHPOINT 1 | |
290 | #endif | |
291 | ||
292 | #ifndef HAVE_NONSTEPPABLE_WATCHPOINT | |
293 | #define HAVE_NONSTEPPABLE_WATCHPOINT 0 | |
294 | #else | |
295 | #undef HAVE_NONSTEPPABLE_WATCHPOINT | |
296 | #define HAVE_NONSTEPPABLE_WATCHPOINT 1 | |
297 | #endif | |
298 | ||
299 | #ifndef HAVE_CONTINUABLE_WATCHPOINT | |
300 | #define HAVE_CONTINUABLE_WATCHPOINT 0 | |
301 | #else | |
302 | #undef HAVE_CONTINUABLE_WATCHPOINT | |
303 | #define HAVE_CONTINUABLE_WATCHPOINT 1 | |
304 | #endif | |
305 | ||
692590c1 MS |
306 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
307 | #define CANNOT_STEP_HW_WATCHPOINTS 0 | |
308 | #else | |
309 | #undef CANNOT_STEP_HW_WATCHPOINTS | |
310 | #define CANNOT_STEP_HW_WATCHPOINTS 1 | |
311 | #endif | |
312 | ||
c906108c SS |
313 | /* Tables of how to react to signals; the user sets them. */ |
314 | ||
315 | static unsigned char *signal_stop; | |
316 | static unsigned char *signal_print; | |
317 | static unsigned char *signal_program; | |
318 | ||
319 | #define SET_SIGS(nsigs,sigs,flags) \ | |
320 | do { \ | |
321 | int signum = (nsigs); \ | |
322 | while (signum-- > 0) \ | |
323 | if ((sigs)[signum]) \ | |
324 | (flags)[signum] = 1; \ | |
325 | } while (0) | |
326 | ||
327 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
328 | do { \ | |
329 | int signum = (nsigs); \ | |
330 | while (signum-- > 0) \ | |
331 | if ((sigs)[signum]) \ | |
332 | (flags)[signum] = 0; \ | |
333 | } while (0) | |
334 | ||
335 | ||
336 | /* Command list pointer for the "stop" placeholder. */ | |
337 | ||
338 | static struct cmd_list_element *stop_command; | |
339 | ||
340 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
341 | ||
342 | static int breakpoints_inserted; | |
343 | ||
344 | /* Function inferior was in as of last step command. */ | |
345 | ||
346 | static struct symbol *step_start_function; | |
347 | ||
348 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
349 | ||
350 | static int trap_expected; | |
351 | ||
352 | #ifdef SOLIB_ADD | |
353 | /* Nonzero if we want to give control to the user when we're notified | |
354 | of shared library events by the dynamic linker. */ | |
355 | static int stop_on_solib_events; | |
356 | #endif | |
357 | ||
358 | #ifdef HP_OS_BUG | |
359 | /* Nonzero if the next time we try to continue the inferior, it will | |
360 | step one instruction and generate a spurious trace trap. | |
361 | This is used to compensate for a bug in HP-UX. */ | |
362 | ||
363 | static int trap_expected_after_continue; | |
364 | #endif | |
365 | ||
366 | /* Nonzero means expecting a trace trap | |
367 | and should stop the inferior and return silently when it happens. */ | |
368 | ||
369 | int stop_after_trap; | |
370 | ||
371 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
372 | It is used after attach, due to attaching to a process; | |
373 | when running in the shell before the child program has been exec'd; | |
374 | and when running some kinds of remote stuff (FIXME?). */ | |
375 | ||
376 | int stop_soon_quietly; | |
377 | ||
378 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
379 | situation when stop_registers should be saved. */ | |
380 | ||
381 | int proceed_to_finish; | |
382 | ||
383 | /* Save register contents here when about to pop a stack dummy frame, | |
384 | if-and-only-if proceed_to_finish is set. | |
385 | Thus this contains the return value from the called function (assuming | |
386 | values are returned in a register). */ | |
387 | ||
7a292a7a | 388 | char *stop_registers; |
c906108c SS |
389 | |
390 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
391 | ||
392 | static int breakpoints_failed; | |
393 | ||
394 | /* Nonzero after stop if current stack frame should be printed. */ | |
395 | ||
396 | static int stop_print_frame; | |
397 | ||
398 | static struct breakpoint *step_resume_breakpoint = NULL; | |
399 | static struct breakpoint *through_sigtramp_breakpoint = NULL; | |
400 | ||
401 | /* On some platforms (e.g., HP-UX), hardware watchpoints have bad | |
402 | interactions with an inferior that is running a kernel function | |
403 | (aka, a system call or "syscall"). wait_for_inferior therefore | |
404 | may have a need to know when the inferior is in a syscall. This | |
405 | is a count of the number of inferior threads which are known to | |
406 | currently be running in a syscall. */ | |
407 | static int number_of_threads_in_syscalls; | |
408 | ||
409 | /* This is used to remember when a fork, vfork or exec event | |
410 | was caught by a catchpoint, and thus the event is to be | |
411 | followed at the next resume of the inferior, and not | |
412 | immediately. */ | |
413 | static struct | |
414 | { | |
415 | enum target_waitkind kind; | |
416 | struct | |
417 | { | |
418 | int parent_pid; | |
419 | int saw_parent_fork; | |
420 | int child_pid; | |
421 | int saw_child_fork; | |
422 | int saw_child_exec; | |
423 | } | |
424 | fork_event; | |
425 | char *execd_pathname; | |
426 | } | |
427 | pending_follow; | |
428 | ||
429 | /* Some platforms don't allow us to do anything meaningful with a | |
430 | vforked child until it has exec'd. Vforked processes on such | |
431 | platforms can only be followed after they've exec'd. | |
432 | ||
433 | When this is set to 0, a vfork can be immediately followed, | |
434 | and an exec can be followed merely as an exec. When this is | |
435 | set to 1, a vfork event has been seen, but cannot be followed | |
436 | until the exec is seen. | |
437 | ||
438 | (In the latter case, inferior_pid is still the parent of the | |
439 | vfork, and pending_follow.fork_event.child_pid is the child. The | |
440 | appropriate process is followed, according to the setting of | |
441 | follow-fork-mode.) */ | |
442 | static int follow_vfork_when_exec; | |
443 | ||
53904c9e AC |
444 | static const char follow_fork_mode_ask[] = "ask"; |
445 | static const char follow_fork_mode_both[] = "both"; | |
446 | static const char follow_fork_mode_child[] = "child"; | |
447 | static const char follow_fork_mode_parent[] = "parent"; | |
448 | ||
449 | static const char *follow_fork_mode_kind_names[] = | |
c906108c | 450 | { |
53904c9e | 451 | follow_fork_mode_ask, |
ef346e04 AC |
452 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 |
453 | kernel problem. It's also not terribly useful without a GUI to | |
454 | help the user drive two debuggers. So for now, I'm disabling the | |
455 | "both" option. */ | |
53904c9e AC |
456 | /* follow_fork_mode_both, */ |
457 | follow_fork_mode_child, | |
458 | follow_fork_mode_parent, | |
459 | NULL | |
ef346e04 | 460 | }; |
c906108c | 461 | |
53904c9e | 462 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
c906108c SS |
463 | \f |
464 | ||
c906108c | 465 | static void |
96baa820 JM |
466 | follow_inferior_fork (int parent_pid, int child_pid, int has_forked, |
467 | int has_vforked) | |
c906108c SS |
468 | { |
469 | int followed_parent = 0; | |
470 | int followed_child = 0; | |
c906108c SS |
471 | |
472 | /* Which process did the user want us to follow? */ | |
53904c9e | 473 | const char *follow_mode = follow_fork_mode_string; |
c906108c SS |
474 | |
475 | /* Or, did the user not know, and want us to ask? */ | |
e28d556f | 476 | if (follow_fork_mode_string == follow_fork_mode_ask) |
c906108c | 477 | { |
8e65ff28 AC |
478 | internal_error (__FILE__, __LINE__, |
479 | "follow_inferior_fork: \"ask\" mode not implemented"); | |
53904c9e | 480 | /* follow_mode = follow_fork_mode_...; */ |
c906108c SS |
481 | } |
482 | ||
483 | /* If we're to be following the parent, then detach from child_pid. | |
484 | We're already following the parent, so need do nothing explicit | |
485 | for it. */ | |
53904c9e | 486 | if (follow_mode == follow_fork_mode_parent) |
c906108c SS |
487 | { |
488 | followed_parent = 1; | |
489 | ||
490 | /* We're already attached to the parent, by default. */ | |
491 | ||
492 | /* Before detaching from the child, remove all breakpoints from | |
493 | it. (This won't actually modify the breakpoint list, but will | |
494 | physically remove the breakpoints from the child.) */ | |
495 | if (!has_vforked || !follow_vfork_when_exec) | |
496 | { | |
497 | detach_breakpoints (child_pid); | |
7a292a7a | 498 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
c906108c | 499 | SOLIB_REMOVE_INFERIOR_HOOK (child_pid); |
7a292a7a | 500 | #endif |
c906108c SS |
501 | } |
502 | ||
503 | /* Detach from the child. */ | |
504 | dont_repeat (); | |
505 | ||
506 | target_require_detach (child_pid, "", 1); | |
507 | } | |
508 | ||
509 | /* If we're to be following the child, then attach to it, detach | |
510 | from inferior_pid, and set inferior_pid to child_pid. */ | |
53904c9e | 511 | else if (follow_mode == follow_fork_mode_child) |
c906108c SS |
512 | { |
513 | char child_pid_spelling[100]; /* Arbitrary length. */ | |
514 | ||
515 | followed_child = 1; | |
516 | ||
517 | /* Before detaching from the parent, detach all breakpoints from | |
518 | the child. But only if we're forking, or if we follow vforks | |
519 | as soon as they happen. (If we're following vforks only when | |
520 | the child has exec'd, then it's very wrong to try to write | |
521 | back the "shadow contents" of inserted breakpoints now -- they | |
522 | belong to the child's pre-exec'd a.out.) */ | |
523 | if (!has_vforked || !follow_vfork_when_exec) | |
524 | { | |
525 | detach_breakpoints (child_pid); | |
526 | } | |
527 | ||
528 | /* Before detaching from the parent, remove all breakpoints from it. */ | |
529 | remove_breakpoints (); | |
530 | ||
531 | /* Also reset the solib inferior hook from the parent. */ | |
7a292a7a | 532 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
c906108c | 533 | SOLIB_REMOVE_INFERIOR_HOOK (inferior_pid); |
7a292a7a | 534 | #endif |
c906108c SS |
535 | |
536 | /* Detach from the parent. */ | |
537 | dont_repeat (); | |
538 | target_detach (NULL, 1); | |
539 | ||
540 | /* Attach to the child. */ | |
541 | inferior_pid = child_pid; | |
542 | sprintf (child_pid_spelling, "%d", child_pid); | |
543 | dont_repeat (); | |
544 | ||
545 | target_require_attach (child_pid_spelling, 1); | |
546 | ||
547 | /* Was there a step_resume breakpoint? (There was if the user | |
548 | did a "next" at the fork() call.) If so, explicitly reset its | |
549 | thread number. | |
550 | ||
551 | step_resumes are a form of bp that are made to be per-thread. | |
552 | Since we created the step_resume bp when the parent process | |
553 | was being debugged, and now are switching to the child process, | |
554 | from the breakpoint package's viewpoint, that's a switch of | |
555 | "threads". We must update the bp's notion of which thread | |
556 | it is for, or it'll be ignored when it triggers... */ | |
557 | if (step_resume_breakpoint && | |
558 | (!has_vforked || !follow_vfork_when_exec)) | |
559 | breakpoint_re_set_thread (step_resume_breakpoint); | |
560 | ||
561 | /* Reinsert all breakpoints in the child. (The user may've set | |
562 | breakpoints after catching the fork, in which case those | |
563 | actually didn't get set in the child, but only in the parent.) */ | |
564 | if (!has_vforked || !follow_vfork_when_exec) | |
565 | { | |
566 | breakpoint_re_set (); | |
567 | insert_breakpoints (); | |
568 | } | |
569 | } | |
570 | ||
571 | /* If we're to be following both parent and child, then fork ourselves, | |
572 | and attach the debugger clone to the child. */ | |
53904c9e | 573 | else if (follow_mode == follow_fork_mode_both) |
c906108c SS |
574 | { |
575 | char pid_suffix[100]; /* Arbitrary length. */ | |
576 | ||
577 | /* Clone ourselves to follow the child. This is the end of our | |
c5aa993b | 578 | involvement with child_pid; our clone will take it from here... */ |
c906108c SS |
579 | dont_repeat (); |
580 | target_clone_and_follow_inferior (child_pid, &followed_child); | |
581 | followed_parent = !followed_child; | |
582 | ||
583 | /* We continue to follow the parent. To help distinguish the two | |
584 | debuggers, though, both we and our clone will reset our prompts. */ | |
585 | sprintf (pid_suffix, "[%d] ", inferior_pid); | |
586 | set_prompt (strcat (get_prompt (), pid_suffix)); | |
587 | } | |
588 | ||
589 | /* The parent and child of a vfork share the same address space. | |
590 | Also, on some targets the order in which vfork and exec events | |
591 | are received for parent in child requires some delicate handling | |
592 | of the events. | |
593 | ||
594 | For instance, on ptrace-based HPUX we receive the child's vfork | |
595 | event first, at which time the parent has been suspended by the | |
596 | OS and is essentially untouchable until the child's exit or second | |
597 | exec event arrives. At that time, the parent's vfork event is | |
598 | delivered to us, and that's when we see and decide how to follow | |
599 | the vfork. But to get to that point, we must continue the child | |
600 | until it execs or exits. To do that smoothly, all breakpoints | |
601 | must be removed from the child, in case there are any set between | |
602 | the vfork() and exec() calls. But removing them from the child | |
603 | also removes them from the parent, due to the shared-address-space | |
604 | nature of a vfork'd parent and child. On HPUX, therefore, we must | |
605 | take care to restore the bp's to the parent before we continue it. | |
606 | Else, it's likely that we may not stop in the expected place. (The | |
607 | worst scenario is when the user tries to step over a vfork() call; | |
608 | the step-resume bp must be restored for the step to properly stop | |
609 | in the parent after the call completes!) | |
610 | ||
611 | Sequence of events, as reported to gdb from HPUX: | |
612 | ||
c5aa993b JM |
613 | Parent Child Action for gdb to take |
614 | ------------------------------------------------------- | |
615 | 1 VFORK Continue child | |
616 | 2 EXEC | |
617 | 3 EXEC or EXIT | |
618 | 4 VFORK */ | |
c906108c SS |
619 | if (has_vforked) |
620 | { | |
621 | target_post_follow_vfork (parent_pid, | |
622 | followed_parent, | |
623 | child_pid, | |
624 | followed_child); | |
625 | } | |
626 | ||
627 | pending_follow.fork_event.saw_parent_fork = 0; | |
628 | pending_follow.fork_event.saw_child_fork = 0; | |
c906108c SS |
629 | } |
630 | ||
631 | static void | |
96baa820 | 632 | follow_fork (int parent_pid, int child_pid) |
c906108c SS |
633 | { |
634 | follow_inferior_fork (parent_pid, child_pid, 1, 0); | |
635 | } | |
636 | ||
637 | ||
638 | /* Forward declaration. */ | |
96baa820 | 639 | static void follow_exec (int, char *); |
c906108c SS |
640 | |
641 | static void | |
96baa820 | 642 | follow_vfork (int parent_pid, int child_pid) |
c906108c SS |
643 | { |
644 | follow_inferior_fork (parent_pid, child_pid, 0, 1); | |
645 | ||
646 | /* Did we follow the child? Had it exec'd before we saw the parent vfork? */ | |
647 | if (pending_follow.fork_event.saw_child_exec && (inferior_pid == child_pid)) | |
648 | { | |
649 | pending_follow.fork_event.saw_child_exec = 0; | |
650 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
651 | follow_exec (inferior_pid, pending_follow.execd_pathname); | |
b8c9b27d | 652 | xfree (pending_follow.execd_pathname); |
c906108c SS |
653 | } |
654 | } | |
c906108c | 655 | |
1adeb98a FN |
656 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
657 | ||
c906108c | 658 | static void |
96baa820 | 659 | follow_exec (int pid, char *execd_pathname) |
c906108c | 660 | { |
c906108c | 661 | int saved_pid = pid; |
7a292a7a SS |
662 | struct target_ops *tgt; |
663 | ||
664 | if (!may_follow_exec) | |
665 | return; | |
c906108c SS |
666 | |
667 | /* Did this exec() follow a vfork()? If so, we must follow the | |
668 | vfork now too. Do it before following the exec. */ | |
669 | if (follow_vfork_when_exec && | |
670 | (pending_follow.kind == TARGET_WAITKIND_VFORKED)) | |
671 | { | |
672 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
673 | follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); | |
674 | follow_vfork_when_exec = 0; | |
675 | saved_pid = inferior_pid; | |
676 | ||
677 | /* Did we follow the parent? If so, we're done. If we followed | |
678 | the child then we must also follow its exec(). */ | |
679 | if (inferior_pid == pending_follow.fork_event.parent_pid) | |
680 | return; | |
681 | } | |
682 | ||
683 | /* This is an exec event that we actually wish to pay attention to. | |
684 | Refresh our symbol table to the newly exec'd program, remove any | |
685 | momentary bp's, etc. | |
686 | ||
687 | If there are breakpoints, they aren't really inserted now, | |
688 | since the exec() transformed our inferior into a fresh set | |
689 | of instructions. | |
690 | ||
691 | We want to preserve symbolic breakpoints on the list, since | |
692 | we have hopes that they can be reset after the new a.out's | |
693 | symbol table is read. | |
694 | ||
695 | However, any "raw" breakpoints must be removed from the list | |
696 | (e.g., the solib bp's), since their address is probably invalid | |
697 | now. | |
698 | ||
699 | And, we DON'T want to call delete_breakpoints() here, since | |
700 | that may write the bp's "shadow contents" (the instruction | |
701 | value that was overwritten witha TRAP instruction). Since | |
702 | we now have a new a.out, those shadow contents aren't valid. */ | |
703 | update_breakpoints_after_exec (); | |
704 | ||
705 | /* If there was one, it's gone now. We cannot truly step-to-next | |
706 | statement through an exec(). */ | |
707 | step_resume_breakpoint = NULL; | |
708 | step_range_start = 0; | |
709 | step_range_end = 0; | |
710 | ||
711 | /* If there was one, it's gone now. */ | |
712 | through_sigtramp_breakpoint = NULL; | |
713 | ||
714 | /* What is this a.out's name? */ | |
715 | printf_unfiltered ("Executing new program: %s\n", execd_pathname); | |
716 | ||
717 | /* We've followed the inferior through an exec. Therefore, the | |
718 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
719 | |
720 | /* First collect the run target in effect. */ | |
721 | tgt = find_run_target (); | |
722 | /* If we can't find one, things are in a very strange state... */ | |
723 | if (tgt == NULL) | |
724 | error ("Could find run target to save before following exec"); | |
725 | ||
c906108c SS |
726 | gdb_flush (gdb_stdout); |
727 | target_mourn_inferior (); | |
c5aa993b | 728 | inferior_pid = saved_pid; /* Because mourn_inferior resets inferior_pid. */ |
7a292a7a | 729 | push_target (tgt); |
c906108c SS |
730 | |
731 | /* That a.out is now the one to use. */ | |
732 | exec_file_attach (execd_pathname, 0); | |
733 | ||
734 | /* And also is where symbols can be found. */ | |
1adeb98a | 735 | symbol_file_add_main (execd_pathname, 0); |
c906108c SS |
736 | |
737 | /* Reset the shared library package. This ensures that we get | |
738 | a shlib event when the child reaches "_start", at which point | |
739 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 740 | #if defined(SOLIB_RESTART) |
c906108c | 741 | SOLIB_RESTART (); |
7a292a7a SS |
742 | #endif |
743 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
c906108c | 744 | SOLIB_CREATE_INFERIOR_HOOK (inferior_pid); |
7a292a7a | 745 | #endif |
c906108c SS |
746 | |
747 | /* Reinsert all breakpoints. (Those which were symbolic have | |
748 | been reset to the proper address in the new a.out, thanks | |
749 | to symbol_file_command...) */ | |
750 | insert_breakpoints (); | |
751 | ||
752 | /* The next resume of this inferior should bring it to the shlib | |
753 | startup breakpoints. (If the user had also set bp's on | |
754 | "main" from the old (parent) process, then they'll auto- | |
755 | matically get reset there in the new process.) */ | |
c906108c SS |
756 | } |
757 | ||
758 | /* Non-zero if we just simulating a single-step. This is needed | |
759 | because we cannot remove the breakpoints in the inferior process | |
760 | until after the `wait' in `wait_for_inferior'. */ | |
761 | static int singlestep_breakpoints_inserted_p = 0; | |
762 | \f | |
763 | ||
764 | /* Things to clean up if we QUIT out of resume (). */ | |
765 | /* ARGSUSED */ | |
766 | static void | |
74b7792f | 767 | resume_cleanups (void *ignore) |
c906108c SS |
768 | { |
769 | normal_stop (); | |
770 | } | |
771 | ||
53904c9e AC |
772 | static const char schedlock_off[] = "off"; |
773 | static const char schedlock_on[] = "on"; | |
774 | static const char schedlock_step[] = "step"; | |
775 | static const char *scheduler_mode = schedlock_off; | |
776 | static const char *scheduler_enums[] = | |
ef346e04 AC |
777 | { |
778 | schedlock_off, | |
779 | schedlock_on, | |
780 | schedlock_step, | |
781 | NULL | |
782 | }; | |
c906108c SS |
783 | |
784 | static void | |
96baa820 | 785 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c SS |
786 | { |
787 | if (c->type == set_cmd) | |
788 | if (!target_can_lock_scheduler) | |
789 | { | |
790 | scheduler_mode = schedlock_off; | |
791 | error ("Target '%s' cannot support this command.", | |
792 | target_shortname); | |
793 | } | |
794 | } | |
795 | ||
796 | ||
c2c6d25f JM |
797 | |
798 | ||
c906108c SS |
799 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
800 | wants to interrupt some lengthy single-stepping operation | |
801 | (for child processes, the SIGINT goes to the inferior, and so | |
802 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
803 | other targets, that's not true). | |
804 | ||
805 | STEP nonzero if we should step (zero to continue instead). | |
806 | SIG is the signal to give the inferior (zero for none). */ | |
807 | void | |
96baa820 | 808 | resume (int step, enum target_signal sig) |
c906108c SS |
809 | { |
810 | int should_resume = 1; | |
74b7792f | 811 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
c906108c SS |
812 | QUIT; |
813 | ||
814 | #ifdef CANNOT_STEP_BREAKPOINT | |
815 | /* Most targets can step a breakpoint instruction, thus executing it | |
816 | normally. But if this one cannot, just continue and we will hit | |
817 | it anyway. */ | |
818 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
819 | step = 0; | |
820 | #endif | |
821 | ||
692590c1 MS |
822 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
823 | over an instruction that causes a page fault without triggering | |
824 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
825 | stop, because the hardware watchpoint is not triggered, but it forgets | |
826 | the step request and continues the program normally. | |
827 | Work around the problem by removing hardware watchpoints if a step is | |
828 | requested, GDB will check for a hardware watchpoint trigger after the | |
829 | step anyway. */ | |
830 | if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) | |
831 | remove_hw_watchpoints (); | |
832 | ||
833 | ||
c2c6d25f JM |
834 | /* Normally, by the time we reach `resume', the breakpoints are either |
835 | removed or inserted, as appropriate. The exception is if we're sitting | |
836 | at a permanent breakpoint; we need to step over it, but permanent | |
837 | breakpoints can't be removed. So we have to test for it here. */ | |
838 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
839 | SKIP_PERMANENT_BREAKPOINT (); | |
840 | ||
b0ed3589 | 841 | if (SOFTWARE_SINGLE_STEP_P () && step) |
c906108c SS |
842 | { |
843 | /* Do it the hard way, w/temp breakpoints */ | |
c5aa993b | 844 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
c906108c SS |
845 | /* ...and don't ask hardware to do it. */ |
846 | step = 0; | |
847 | /* and do not pull these breakpoints until after a `wait' in | |
848 | `wait_for_inferior' */ | |
849 | singlestep_breakpoints_inserted_p = 1; | |
850 | } | |
851 | ||
852 | /* Handle any optimized stores to the inferior NOW... */ | |
853 | #ifdef DO_DEFERRED_STORES | |
854 | DO_DEFERRED_STORES; | |
855 | #endif | |
856 | ||
c906108c SS |
857 | /* If there were any forks/vforks/execs that were caught and are |
858 | now to be followed, then do so. */ | |
859 | switch (pending_follow.kind) | |
860 | { | |
861 | case (TARGET_WAITKIND_FORKED): | |
862 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
863 | follow_fork (inferior_pid, pending_follow.fork_event.child_pid); | |
864 | break; | |
865 | ||
866 | case (TARGET_WAITKIND_VFORKED): | |
867 | { | |
868 | int saw_child_exec = pending_follow.fork_event.saw_child_exec; | |
869 | ||
870 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
871 | follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); | |
872 | ||
873 | /* Did we follow the child, but not yet see the child's exec event? | |
c5aa993b JM |
874 | If so, then it actually ought to be waiting for us; we respond to |
875 | parent vfork events. We don't actually want to resume the child | |
876 | in this situation; we want to just get its exec event. */ | |
c906108c SS |
877 | if (!saw_child_exec && |
878 | (inferior_pid == pending_follow.fork_event.child_pid)) | |
879 | should_resume = 0; | |
880 | } | |
881 | break; | |
882 | ||
883 | case (TARGET_WAITKIND_EXECD): | |
884 | /* If we saw a vfork event but couldn't follow it until we saw | |
c5aa993b | 885 | an exec, then now might be the time! */ |
c906108c SS |
886 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
887 | /* follow_exec is called as soon as the exec event is seen. */ | |
888 | break; | |
889 | ||
890 | default: | |
891 | break; | |
892 | } | |
c906108c SS |
893 | |
894 | /* Install inferior's terminal modes. */ | |
895 | target_terminal_inferior (); | |
896 | ||
897 | if (should_resume) | |
898 | { | |
dfcd3bfb JM |
899 | int resume_pid; |
900 | ||
7a292a7a | 901 | if (use_thread_step_needed && thread_step_needed) |
c906108c SS |
902 | { |
903 | /* We stopped on a BPT instruction; | |
904 | don't continue other threads and | |
905 | just step this thread. */ | |
906 | thread_step_needed = 0; | |
907 | ||
908 | if (!breakpoint_here_p (read_pc ())) | |
909 | { | |
910 | /* Breakpoint deleted: ok to do regular resume | |
c5aa993b | 911 | where all the threads either step or continue. */ |
dfcd3bfb | 912 | resume_pid = -1; |
c906108c SS |
913 | } |
914 | else | |
915 | { | |
916 | if (!step) | |
917 | { | |
918 | warning ("Internal error, changing continue to step."); | |
919 | remove_breakpoints (); | |
920 | breakpoints_inserted = 0; | |
921 | trap_expected = 1; | |
922 | step = 1; | |
923 | } | |
dfcd3bfb | 924 | resume_pid = inferior_pid; |
c906108c SS |
925 | } |
926 | } | |
927 | else | |
c906108c SS |
928 | { |
929 | /* Vanilla resume. */ | |
c906108c SS |
930 | if ((scheduler_mode == schedlock_on) || |
931 | (scheduler_mode == schedlock_step && step != 0)) | |
dfcd3bfb | 932 | resume_pid = inferior_pid; |
c906108c | 933 | else |
dfcd3bfb | 934 | resume_pid = -1; |
c906108c | 935 | } |
dfcd3bfb | 936 | target_resume (resume_pid, step, sig); |
c906108c SS |
937 | } |
938 | ||
939 | discard_cleanups (old_cleanups); | |
940 | } | |
941 | \f | |
942 | ||
943 | /* Clear out all variables saying what to do when inferior is continued. | |
944 | First do this, then set the ones you want, then call `proceed'. */ | |
945 | ||
946 | void | |
96baa820 | 947 | clear_proceed_status (void) |
c906108c SS |
948 | { |
949 | trap_expected = 0; | |
950 | step_range_start = 0; | |
951 | step_range_end = 0; | |
952 | step_frame_address = 0; | |
5fbbeb29 | 953 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c SS |
954 | stop_after_trap = 0; |
955 | stop_soon_quietly = 0; | |
956 | proceed_to_finish = 0; | |
957 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
958 | ||
959 | /* Discard any remaining commands or status from previous stop. */ | |
960 | bpstat_clear (&stop_bpstat); | |
961 | } | |
962 | ||
963 | /* Basic routine for continuing the program in various fashions. | |
964 | ||
965 | ADDR is the address to resume at, or -1 for resume where stopped. | |
966 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 967 | or -1 for act according to how it stopped. |
c906108c | 968 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
969 | -1 means return after that and print nothing. |
970 | You should probably set various step_... variables | |
971 | before calling here, if you are stepping. | |
c906108c SS |
972 | |
973 | You should call clear_proceed_status before calling proceed. */ | |
974 | ||
975 | void | |
96baa820 | 976 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
977 | { |
978 | int oneproc = 0; | |
979 | ||
980 | if (step > 0) | |
981 | step_start_function = find_pc_function (read_pc ()); | |
982 | if (step < 0) | |
983 | stop_after_trap = 1; | |
984 | ||
2acceee2 | 985 | if (addr == (CORE_ADDR) -1) |
c906108c SS |
986 | { |
987 | /* If there is a breakpoint at the address we will resume at, | |
c5aa993b JM |
988 | step one instruction before inserting breakpoints |
989 | so that we do not stop right away (and report a second | |
c906108c SS |
990 | hit at this breakpoint). */ |
991 | ||
992 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) | |
993 | oneproc = 1; | |
994 | ||
995 | #ifndef STEP_SKIPS_DELAY | |
996 | #define STEP_SKIPS_DELAY(pc) (0) | |
997 | #define STEP_SKIPS_DELAY_P (0) | |
998 | #endif | |
999 | /* Check breakpoint_here_p first, because breakpoint_here_p is fast | |
c5aa993b JM |
1000 | (it just checks internal GDB data structures) and STEP_SKIPS_DELAY |
1001 | is slow (it needs to read memory from the target). */ | |
c906108c SS |
1002 | if (STEP_SKIPS_DELAY_P |
1003 | && breakpoint_here_p (read_pc () + 4) | |
1004 | && STEP_SKIPS_DELAY (read_pc ())) | |
1005 | oneproc = 1; | |
1006 | } | |
1007 | else | |
1008 | { | |
1009 | write_pc (addr); | |
1010 | ||
1011 | /* New address; we don't need to single-step a thread | |
c5aa993b JM |
1012 | over a breakpoint we just hit, 'cause we aren't |
1013 | continuing from there. | |
c906108c | 1014 | |
c5aa993b JM |
1015 | It's not worth worrying about the case where a user |
1016 | asks for a "jump" at the current PC--if they get the | |
1017 | hiccup of re-hiting a hit breakpoint, what else do | |
1018 | they expect? */ | |
c906108c SS |
1019 | thread_step_needed = 0; |
1020 | } | |
1021 | ||
1022 | #ifdef PREPARE_TO_PROCEED | |
1023 | /* In a multi-threaded task we may select another thread | |
1024 | and then continue or step. | |
1025 | ||
1026 | But if the old thread was stopped at a breakpoint, it | |
1027 | will immediately cause another breakpoint stop without | |
1028 | any execution (i.e. it will report a breakpoint hit | |
1029 | incorrectly). So we must step over it first. | |
1030 | ||
1031 | PREPARE_TO_PROCEED checks the current thread against the thread | |
1032 | that reported the most recent event. If a step-over is required | |
1033 | it returns TRUE and sets the current thread to the old thread. */ | |
9e086581 | 1034 | if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ())) |
c906108c SS |
1035 | { |
1036 | oneproc = 1; | |
1037 | thread_step_needed = 1; | |
1038 | } | |
1039 | ||
1040 | #endif /* PREPARE_TO_PROCEED */ | |
1041 | ||
1042 | #ifdef HP_OS_BUG | |
1043 | if (trap_expected_after_continue) | |
1044 | { | |
1045 | /* If (step == 0), a trap will be automatically generated after | |
c5aa993b JM |
1046 | the first instruction is executed. Force step one |
1047 | instruction to clear this condition. This should not occur | |
1048 | if step is nonzero, but it is harmless in that case. */ | |
c906108c SS |
1049 | oneproc = 1; |
1050 | trap_expected_after_continue = 0; | |
1051 | } | |
1052 | #endif /* HP_OS_BUG */ | |
1053 | ||
1054 | if (oneproc) | |
1055 | /* We will get a trace trap after one instruction. | |
1056 | Continue it automatically and insert breakpoints then. */ | |
1057 | trap_expected = 1; | |
1058 | else | |
1059 | { | |
1060 | int temp = insert_breakpoints (); | |
1061 | if (temp) | |
1062 | { | |
010a3cd9 | 1063 | print_sys_errmsg ("insert_breakpoints", temp); |
c906108c | 1064 | error ("Cannot insert breakpoints.\n\ |
010a3cd9 EZ |
1065 | The same program may be running in another process,\n\ |
1066 | or you may have requested too many hardware\n\ | |
1067 | breakpoints and/or watchpoints.\n"); | |
c906108c SS |
1068 | } |
1069 | ||
1070 | breakpoints_inserted = 1; | |
1071 | } | |
1072 | ||
1073 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
1074 | stop_signal = siggnal; | |
1075 | /* If this signal should not be seen by program, | |
1076 | give it zero. Used for debugging signals. */ | |
1077 | else if (!signal_program[stop_signal]) | |
1078 | stop_signal = TARGET_SIGNAL_0; | |
1079 | ||
1080 | annotate_starting (); | |
1081 | ||
1082 | /* Make sure that output from GDB appears before output from the | |
1083 | inferior. */ | |
1084 | gdb_flush (gdb_stdout); | |
1085 | ||
1086 | /* Resume inferior. */ | |
1087 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
1088 | ||
1089 | /* Wait for it to stop (if not standalone) | |
1090 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
1091 | /* Do this only if we are not using the event loop, or if the target |
1092 | does not support asynchronous execution. */ | |
6426a772 | 1093 | if (!event_loop_p || !target_can_async_p ()) |
43ff13b4 JM |
1094 | { |
1095 | wait_for_inferior (); | |
1096 | normal_stop (); | |
1097 | } | |
c906108c SS |
1098 | } |
1099 | ||
1100 | /* Record the pc and sp of the program the last time it stopped. | |
1101 | These are just used internally by wait_for_inferior, but need | |
1102 | to be preserved over calls to it and cleared when the inferior | |
1103 | is started. */ | |
1104 | static CORE_ADDR prev_pc; | |
1105 | static CORE_ADDR prev_func_start; | |
1106 | static char *prev_func_name; | |
1107 | \f | |
1108 | ||
1109 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 1110 | |
c906108c | 1111 | void |
96baa820 | 1112 | start_remote (void) |
c906108c SS |
1113 | { |
1114 | init_thread_list (); | |
1115 | init_wait_for_inferior (); | |
1116 | stop_soon_quietly = 1; | |
1117 | trap_expected = 0; | |
43ff13b4 | 1118 | |
6426a772 JM |
1119 | /* Always go on waiting for the target, regardless of the mode. */ |
1120 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 1121 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
1122 | nothing is returned (instead of just blocking). Because of this, |
1123 | targets expecting an immediate response need to, internally, set | |
1124 | things up so that the target_wait() is forced to eventually | |
1125 | timeout. */ | |
1126 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
1127 | differentiate to its caller what the state of the target is after | |
1128 | the initial open has been performed. Here we're assuming that | |
1129 | the target has stopped. It should be possible to eventually have | |
1130 | target_open() return to the caller an indication that the target | |
1131 | is currently running and GDB state should be set to the same as | |
1132 | for an async run. */ | |
1133 | wait_for_inferior (); | |
1134 | normal_stop (); | |
c906108c SS |
1135 | } |
1136 | ||
1137 | /* Initialize static vars when a new inferior begins. */ | |
1138 | ||
1139 | void | |
96baa820 | 1140 | init_wait_for_inferior (void) |
c906108c SS |
1141 | { |
1142 | /* These are meaningless until the first time through wait_for_inferior. */ | |
1143 | prev_pc = 0; | |
1144 | prev_func_start = 0; | |
1145 | prev_func_name = NULL; | |
1146 | ||
1147 | #ifdef HP_OS_BUG | |
1148 | trap_expected_after_continue = 0; | |
1149 | #endif | |
1150 | breakpoints_inserted = 0; | |
1151 | breakpoint_init_inferior (inf_starting); | |
1152 | ||
1153 | /* Don't confuse first call to proceed(). */ | |
1154 | stop_signal = TARGET_SIGNAL_0; | |
1155 | ||
1156 | /* The first resume is not following a fork/vfork/exec. */ | |
1157 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
1158 | pending_follow.fork_event.saw_parent_fork = 0; | |
1159 | pending_follow.fork_event.saw_child_fork = 0; | |
1160 | pending_follow.fork_event.saw_child_exec = 0; | |
1161 | ||
1162 | /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ | |
1163 | number_of_threads_in_syscalls = 0; | |
1164 | ||
1165 | clear_proceed_status (); | |
1166 | } | |
1167 | ||
1168 | static void | |
96baa820 | 1169 | delete_breakpoint_current_contents (void *arg) |
c906108c SS |
1170 | { |
1171 | struct breakpoint **breakpointp = (struct breakpoint **) arg; | |
1172 | if (*breakpointp != NULL) | |
1173 | { | |
1174 | delete_breakpoint (*breakpointp); | |
1175 | *breakpointp = NULL; | |
1176 | } | |
1177 | } | |
1178 | \f | |
b83266a0 SS |
1179 | /* This enum encodes possible reasons for doing a target_wait, so that |
1180 | wfi can call target_wait in one place. (Ultimately the call will be | |
1181 | moved out of the infinite loop entirely.) */ | |
1182 | ||
c5aa993b JM |
1183 | enum infwait_states |
1184 | { | |
cd0fc7c3 SS |
1185 | infwait_normal_state, |
1186 | infwait_thread_hop_state, | |
1187 | infwait_nullified_state, | |
1188 | infwait_nonstep_watch_state | |
b83266a0 SS |
1189 | }; |
1190 | ||
11cf8741 JM |
1191 | /* Why did the inferior stop? Used to print the appropriate messages |
1192 | to the interface from within handle_inferior_event(). */ | |
1193 | enum inferior_stop_reason | |
1194 | { | |
1195 | /* We don't know why. */ | |
1196 | STOP_UNKNOWN, | |
1197 | /* Step, next, nexti, stepi finished. */ | |
1198 | END_STEPPING_RANGE, | |
1199 | /* Found breakpoint. */ | |
1200 | BREAKPOINT_HIT, | |
1201 | /* Inferior terminated by signal. */ | |
1202 | SIGNAL_EXITED, | |
1203 | /* Inferior exited. */ | |
1204 | EXITED, | |
1205 | /* Inferior received signal, and user asked to be notified. */ | |
1206 | SIGNAL_RECEIVED | |
1207 | }; | |
1208 | ||
cd0fc7c3 SS |
1209 | /* This structure contains what used to be local variables in |
1210 | wait_for_inferior. Probably many of them can return to being | |
1211 | locals in handle_inferior_event. */ | |
1212 | ||
c5aa993b JM |
1213 | struct execution_control_state |
1214 | { | |
1215 | struct target_waitstatus ws; | |
1216 | struct target_waitstatus *wp; | |
1217 | int another_trap; | |
1218 | int random_signal; | |
1219 | CORE_ADDR stop_func_start; | |
1220 | CORE_ADDR stop_func_end; | |
1221 | char *stop_func_name; | |
1222 | struct symtab_and_line sal; | |
1223 | int remove_breakpoints_on_following_step; | |
1224 | int current_line; | |
1225 | struct symtab *current_symtab; | |
1226 | int handling_longjmp; /* FIXME */ | |
1227 | int pid; | |
1228 | int saved_inferior_pid; | |
1229 | int update_step_sp; | |
1230 | int stepping_through_solib_after_catch; | |
1231 | bpstat stepping_through_solib_catchpoints; | |
1232 | int enable_hw_watchpoints_after_wait; | |
1233 | int stepping_through_sigtramp; | |
1234 | int new_thread_event; | |
1235 | struct target_waitstatus tmpstatus; | |
1236 | enum infwait_states infwait_state; | |
1237 | int waiton_pid; | |
1238 | int wait_some_more; | |
1239 | }; | |
1240 | ||
96baa820 | 1241 | void init_execution_control_state (struct execution_control_state * ecs); |
c5aa993b | 1242 | |
96baa820 | 1243 | void handle_inferior_event (struct execution_control_state * ecs); |
cd0fc7c3 | 1244 | |
104c1213 | 1245 | static void check_sigtramp2 (struct execution_control_state *ecs); |
c2c6d25f | 1246 | static void step_into_function (struct execution_control_state *ecs); |
d4f3574e | 1247 | static void step_over_function (struct execution_control_state *ecs); |
104c1213 JM |
1248 | static void stop_stepping (struct execution_control_state *ecs); |
1249 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 1250 | static void keep_going (struct execution_control_state *ecs); |
11cf8741 | 1251 | static void print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info); |
104c1213 | 1252 | |
cd0fc7c3 SS |
1253 | /* Wait for control to return from inferior to debugger. |
1254 | If inferior gets a signal, we may decide to start it up again | |
1255 | instead of returning. That is why there is a loop in this function. | |
1256 | When this function actually returns it means the inferior | |
1257 | should be left stopped and GDB should read more commands. */ | |
1258 | ||
1259 | void | |
96baa820 | 1260 | wait_for_inferior (void) |
cd0fc7c3 SS |
1261 | { |
1262 | struct cleanup *old_cleanups; | |
1263 | struct execution_control_state ecss; | |
1264 | struct execution_control_state *ecs; | |
c906108c SS |
1265 | |
1266 | old_cleanups = make_cleanup (delete_breakpoint_current_contents, | |
1267 | &step_resume_breakpoint); | |
1268 | make_cleanup (delete_breakpoint_current_contents, | |
1269 | &through_sigtramp_breakpoint); | |
cd0fc7c3 SS |
1270 | |
1271 | /* wfi still stays in a loop, so it's OK just to take the address of | |
1272 | a local to get the ecs pointer. */ | |
1273 | ecs = &ecss; | |
1274 | ||
1275 | /* Fill in with reasonable starting values. */ | |
1276 | init_execution_control_state (ecs); | |
1277 | ||
c906108c SS |
1278 | thread_step_needed = 0; |
1279 | ||
c906108c | 1280 | /* We'll update this if & when we switch to a new thread. */ |
c3f6f71d | 1281 | previous_inferior_pid = inferior_pid; |
c906108c | 1282 | |
cd0fc7c3 SS |
1283 | overlay_cache_invalid = 1; |
1284 | ||
1285 | /* We have to invalidate the registers BEFORE calling target_wait | |
1286 | because they can be loaded from the target while in target_wait. | |
1287 | This makes remote debugging a bit more efficient for those | |
1288 | targets that provide critical registers as part of their normal | |
1289 | status mechanism. */ | |
1290 | ||
1291 | registers_changed (); | |
b83266a0 | 1292 | |
c906108c SS |
1293 | while (1) |
1294 | { | |
cd0fc7c3 SS |
1295 | if (target_wait_hook) |
1296 | ecs->pid = target_wait_hook (ecs->waiton_pid, ecs->wp); | |
1297 | else | |
1298 | ecs->pid = target_wait (ecs->waiton_pid, ecs->wp); | |
c906108c | 1299 | |
cd0fc7c3 SS |
1300 | /* Now figure out what to do with the result of the result. */ |
1301 | handle_inferior_event (ecs); | |
c906108c | 1302 | |
cd0fc7c3 SS |
1303 | if (!ecs->wait_some_more) |
1304 | break; | |
1305 | } | |
1306 | do_cleanups (old_cleanups); | |
1307 | } | |
c906108c | 1308 | |
43ff13b4 JM |
1309 | /* Asynchronous version of wait_for_inferior. It is called by the |
1310 | event loop whenever a change of state is detected on the file | |
1311 | descriptor corresponding to the target. It can be called more than | |
1312 | once to complete a single execution command. In such cases we need | |
1313 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1314 | last time that this function is called for a single execution | |
1315 | command, then report to the user that the inferior has stopped, and | |
1316 | do the necessary cleanups. */ | |
1317 | ||
1318 | struct execution_control_state async_ecss; | |
1319 | struct execution_control_state *async_ecs; | |
1320 | ||
1321 | void | |
fba45db2 | 1322 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1323 | { |
1324 | static struct cleanup *old_cleanups; | |
1325 | ||
c5aa993b | 1326 | async_ecs = &async_ecss; |
43ff13b4 JM |
1327 | |
1328 | if (!async_ecs->wait_some_more) | |
1329 | { | |
1330 | old_cleanups = make_exec_cleanup (delete_breakpoint_current_contents, | |
c5aa993b | 1331 | &step_resume_breakpoint); |
43ff13b4 | 1332 | make_exec_cleanup (delete_breakpoint_current_contents, |
c5aa993b | 1333 | &through_sigtramp_breakpoint); |
43ff13b4 JM |
1334 | |
1335 | /* Fill in with reasonable starting values. */ | |
1336 | init_execution_control_state (async_ecs); | |
1337 | ||
1338 | thread_step_needed = 0; | |
1339 | ||
1340 | /* We'll update this if & when we switch to a new thread. */ | |
c3f6f71d | 1341 | previous_inferior_pid = inferior_pid; |
43ff13b4 JM |
1342 | |
1343 | overlay_cache_invalid = 1; | |
1344 | ||
1345 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1346 | because they can be loaded from the target while in target_wait. |
1347 | This makes remote debugging a bit more efficient for those | |
1348 | targets that provide critical registers as part of their normal | |
1349 | status mechanism. */ | |
43ff13b4 JM |
1350 | |
1351 | registers_changed (); | |
1352 | } | |
1353 | ||
1354 | if (target_wait_hook) | |
1355 | async_ecs->pid = target_wait_hook (async_ecs->waiton_pid, async_ecs->wp); | |
1356 | else | |
1357 | async_ecs->pid = target_wait (async_ecs->waiton_pid, async_ecs->wp); | |
1358 | ||
1359 | /* Now figure out what to do with the result of the result. */ | |
1360 | handle_inferior_event (async_ecs); | |
1361 | ||
1362 | if (!async_ecs->wait_some_more) | |
1363 | { | |
adf40b2e JM |
1364 | /* Do only the cleanups that have been added by this |
1365 | function. Let the continuations for the commands do the rest, | |
1366 | if there are any. */ | |
43ff13b4 JM |
1367 | do_exec_cleanups (old_cleanups); |
1368 | normal_stop (); | |
c2d11a7d JM |
1369 | if (step_multi && stop_step) |
1370 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1371 | else | |
1372 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1373 | } |
1374 | } | |
1375 | ||
cd0fc7c3 SS |
1376 | /* Prepare an execution control state for looping through a |
1377 | wait_for_inferior-type loop. */ | |
1378 | ||
1379 | void | |
96baa820 | 1380 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1381 | { |
c2d11a7d | 1382 | /* ecs->another_trap? */ |
cd0fc7c3 SS |
1383 | ecs->random_signal = 0; |
1384 | ecs->remove_breakpoints_on_following_step = 0; | |
1385 | ecs->handling_longjmp = 0; /* FIXME */ | |
1386 | ecs->update_step_sp = 0; | |
1387 | ecs->stepping_through_solib_after_catch = 0; | |
1388 | ecs->stepping_through_solib_catchpoints = NULL; | |
1389 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1390 | ecs->stepping_through_sigtramp = 0; | |
1391 | ecs->sal = find_pc_line (prev_pc, 0); | |
1392 | ecs->current_line = ecs->sal.line; | |
1393 | ecs->current_symtab = ecs->sal.symtab; | |
1394 | ecs->infwait_state = infwait_normal_state; | |
1395 | ecs->waiton_pid = -1; | |
1396 | ecs->wp = &(ecs->ws); | |
1397 | } | |
1398 | ||
a0b3c4fd | 1399 | /* Call this function before setting step_resume_breakpoint, as a |
53a5351d JM |
1400 | sanity check. There should never be more than one step-resume |
1401 | breakpoint per thread, so we should never be setting a new | |
1402 | step_resume_breakpoint when one is already active. */ | |
a0b3c4fd | 1403 | static void |
96baa820 | 1404 | check_for_old_step_resume_breakpoint (void) |
a0b3c4fd JM |
1405 | { |
1406 | if (step_resume_breakpoint) | |
1407 | warning ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint"); | |
1408 | } | |
1409 | ||
cd0fc7c3 SS |
1410 | /* Given an execution control state that has been freshly filled in |
1411 | by an event from the inferior, figure out what it means and take | |
1412 | appropriate action. */ | |
c906108c | 1413 | |
cd0fc7c3 | 1414 | void |
96baa820 | 1415 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 SS |
1416 | { |
1417 | CORE_ADDR tmp; | |
1418 | int stepped_after_stopped_by_watchpoint; | |
1419 | ||
1420 | /* Keep this extra brace for now, minimizes diffs. */ | |
1421 | { | |
c5aa993b JM |
1422 | switch (ecs->infwait_state) |
1423 | { | |
1424 | case infwait_normal_state: | |
1425 | /* Since we've done a wait, we have a new event. Don't | |
1426 | carry over any expectations about needing to step over a | |
1427 | breakpoint. */ | |
1428 | thread_step_needed = 0; | |
1429 | ||
1430 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event | |
1431 | is serviced in this loop, below. */ | |
1432 | if (ecs->enable_hw_watchpoints_after_wait) | |
1433 | { | |
1434 | TARGET_ENABLE_HW_WATCHPOINTS (inferior_pid); | |
1435 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1436 | } | |
1437 | stepped_after_stopped_by_watchpoint = 0; | |
1438 | break; | |
b83266a0 | 1439 | |
c5aa993b JM |
1440 | case infwait_thread_hop_state: |
1441 | insert_breakpoints (); | |
c906108c | 1442 | |
c5aa993b | 1443 | /* We need to restart all the threads now, |
3cbb88dc | 1444 | * unless we're running in scheduler-locked mode. |
c5aa993b JM |
1445 | * FIXME: shouldn't we look at currently_stepping ()? |
1446 | */ | |
1447 | if (scheduler_mode == schedlock_on) | |
1448 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
1449 | else | |
1450 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
1451 | ecs->infwait_state = infwait_normal_state; | |
104c1213 JM |
1452 | prepare_to_wait (ecs); |
1453 | return; | |
c906108c | 1454 | |
c5aa993b JM |
1455 | case infwait_nullified_state: |
1456 | break; | |
b83266a0 | 1457 | |
c5aa993b JM |
1458 | case infwait_nonstep_watch_state: |
1459 | insert_breakpoints (); | |
b83266a0 | 1460 | |
c5aa993b JM |
1461 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1462 | handle things like signals arriving and other things happening | |
1463 | in combination correctly? */ | |
1464 | stepped_after_stopped_by_watchpoint = 1; | |
1465 | break; | |
1466 | } | |
1467 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1468 | |
c5aa993b | 1469 | flush_cached_frames (); |
c906108c | 1470 | |
c5aa993b | 1471 | /* If it's a new process, add it to the thread database */ |
c906108c | 1472 | |
c5aa993b | 1473 | ecs->new_thread_event = ((ecs->pid != inferior_pid) && !in_thread_list (ecs->pid)); |
c906108c | 1474 | |
c5aa993b JM |
1475 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
1476 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
1477 | && ecs->new_thread_event) | |
1478 | { | |
1479 | add_thread (ecs->pid); | |
c906108c | 1480 | |
8b93c638 JM |
1481 | #ifdef UI_OUT |
1482 | ui_out_text (uiout, "[New "); | |
1483 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->pid)); | |
1484 | ui_out_text (uiout, "]\n"); | |
1485 | #else | |
c5aa993b | 1486 | printf_filtered ("[New %s]\n", target_pid_or_tid_to_str (ecs->pid)); |
8b93c638 | 1487 | #endif |
c906108c SS |
1488 | |
1489 | #if 0 | |
c5aa993b JM |
1490 | /* NOTE: This block is ONLY meant to be invoked in case of a |
1491 | "thread creation event"! If it is invoked for any other | |
1492 | sort of event (such as a new thread landing on a breakpoint), | |
1493 | the event will be discarded, which is almost certainly | |
1494 | a bad thing! | |
1495 | ||
1496 | To avoid this, the low-level module (eg. target_wait) | |
1497 | should call in_thread_list and add_thread, so that the | |
1498 | new thread is known by the time we get here. */ | |
1499 | ||
1500 | /* We may want to consider not doing a resume here in order | |
1501 | to give the user a chance to play with the new thread. | |
1502 | It might be good to make that a user-settable option. */ | |
1503 | ||
1504 | /* At this point, all threads are stopped (happens | |
1505 | automatically in either the OS or the native code). | |
1506 | Therefore we need to continue all threads in order to | |
1507 | make progress. */ | |
1508 | ||
1509 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1510 | prepare_to_wait (ecs); |
1511 | return; | |
c906108c | 1512 | #endif |
c5aa993b | 1513 | } |
c906108c | 1514 | |
c5aa993b JM |
1515 | switch (ecs->ws.kind) |
1516 | { | |
1517 | case TARGET_WAITKIND_LOADED: | |
1518 | /* Ignore gracefully during startup of the inferior, as it | |
1519 | might be the shell which has just loaded some objects, | |
1520 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1521 | #ifdef SOLIB_ADD |
c5aa993b JM |
1522 | if (!stop_soon_quietly) |
1523 | { | |
1524 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1525 | breakpoint addresses via breakpoint_re_set. */ | |
1526 | if (breakpoints_inserted) | |
1527 | remove_breakpoints (); | |
c906108c | 1528 | |
c5aa993b JM |
1529 | /* Check for any newly added shared libraries if we're |
1530 | supposed to be adding them automatically. */ | |
1531 | if (auto_solib_add) | |
1532 | { | |
1533 | /* Switch terminal for any messages produced by | |
1534 | breakpoint_re_set. */ | |
1535 | target_terminal_ours_for_output (); | |
1536 | SOLIB_ADD (NULL, 0, NULL); | |
1537 | target_terminal_inferior (); | |
1538 | } | |
c906108c | 1539 | |
c5aa993b JM |
1540 | /* Reinsert breakpoints and continue. */ |
1541 | if (breakpoints_inserted) | |
1542 | insert_breakpoints (); | |
1543 | } | |
c906108c | 1544 | #endif |
c5aa993b | 1545 | resume (0, TARGET_SIGNAL_0); |
104c1213 JM |
1546 | prepare_to_wait (ecs); |
1547 | return; | |
c5aa993b JM |
1548 | |
1549 | case TARGET_WAITKIND_SPURIOUS: | |
1550 | resume (0, TARGET_SIGNAL_0); | |
104c1213 JM |
1551 | prepare_to_wait (ecs); |
1552 | return; | |
c5aa993b JM |
1553 | |
1554 | case TARGET_WAITKIND_EXITED: | |
1555 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
11cf8741 | 1556 | print_stop_reason (EXITED, ecs->ws.value.integer); |
c5aa993b JM |
1557 | |
1558 | /* Record the exit code in the convenience variable $_exitcode, so | |
1559 | that the user can inspect this again later. */ | |
1560 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1561 | value_from_longest (builtin_type_int, | |
1562 | (LONGEST) ecs->ws.value.integer)); | |
1563 | gdb_flush (gdb_stdout); | |
1564 | target_mourn_inferior (); | |
b0ed3589 | 1565 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ |
c5aa993b | 1566 | stop_print_frame = 0; |
104c1213 JM |
1567 | stop_stepping (ecs); |
1568 | return; | |
c5aa993b JM |
1569 | |
1570 | case TARGET_WAITKIND_SIGNALLED: | |
1571 | stop_print_frame = 0; | |
1572 | stop_signal = ecs->ws.value.sig; | |
1573 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1574 | |
c7e79b4b ND |
1575 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1576 | reach here unless the inferior is dead. However, for years | |
1577 | target_kill() was called here, which hints that fatal signals aren't | |
1578 | really fatal on some systems. If that's true, then some changes | |
1579 | may be needed. */ | |
1580 | target_mourn_inferior (); | |
c5aa993b | 1581 | |
11cf8741 | 1582 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
b0ed3589 | 1583 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P() */ |
104c1213 JM |
1584 | stop_stepping (ecs); |
1585 | return; | |
c5aa993b JM |
1586 | |
1587 | /* The following are the only cases in which we keep going; | |
1588 | the above cases end in a continue or goto. */ | |
1589 | case TARGET_WAITKIND_FORKED: | |
1590 | stop_signal = TARGET_SIGNAL_TRAP; | |
1591 | pending_follow.kind = ecs->ws.kind; | |
1592 | ||
1593 | /* Ignore fork events reported for the parent; we're only | |
1594 | interested in reacting to forks of the child. Note that | |
1595 | we expect the child's fork event to be available if we | |
1596 | waited for it now. */ | |
1597 | if (inferior_pid == ecs->pid) | |
1598 | { | |
1599 | pending_follow.fork_event.saw_parent_fork = 1; | |
1600 | pending_follow.fork_event.parent_pid = ecs->pid; | |
1601 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
104c1213 JM |
1602 | prepare_to_wait (ecs); |
1603 | return; | |
c5aa993b JM |
1604 | } |
1605 | else | |
1606 | { | |
1607 | pending_follow.fork_event.saw_child_fork = 1; | |
1608 | pending_follow.fork_event.child_pid = ecs->pid; | |
1609 | pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid; | |
1610 | } | |
c906108c | 1611 | |
c5aa993b JM |
1612 | stop_pc = read_pc_pid (ecs->pid); |
1613 | ecs->saved_inferior_pid = inferior_pid; | |
1614 | inferior_pid = ecs->pid; | |
6426a772 | 1615 | stop_bpstat = bpstat_stop_status (&stop_pc, currently_stepping (ecs)); |
c5aa993b JM |
1616 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1617 | inferior_pid = ecs->saved_inferior_pid; | |
1618 | goto process_event_stop_test; | |
1619 | ||
1620 | /* If this a platform which doesn't allow a debugger to touch a | |
1621 | vfork'd inferior until after it exec's, then we'd best keep | |
1622 | our fingers entirely off the inferior, other than continuing | |
1623 | it. This has the unfortunate side-effect that catchpoints | |
1624 | of vforks will be ignored. But since the platform doesn't | |
1625 | allow the inferior be touched at vfork time, there's really | |
1626 | little choice. */ | |
1627 | case TARGET_WAITKIND_VFORKED: | |
1628 | stop_signal = TARGET_SIGNAL_TRAP; | |
1629 | pending_follow.kind = ecs->ws.kind; | |
1630 | ||
1631 | /* Is this a vfork of the parent? If so, then give any | |
1632 | vfork catchpoints a chance to trigger now. (It's | |
1633 | dangerous to do so if the child canot be touched until | |
1634 | it execs, and the child has not yet exec'd. We probably | |
1635 | should warn the user to that effect when the catchpoint | |
1636 | triggers...) */ | |
1637 | if (ecs->pid == inferior_pid) | |
1638 | { | |
1639 | pending_follow.fork_event.saw_parent_fork = 1; | |
1640 | pending_follow.fork_event.parent_pid = ecs->pid; | |
1641 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
1642 | } | |
c906108c | 1643 | |
c5aa993b JM |
1644 | /* If we've seen the child's vfork event but cannot really touch |
1645 | the child until it execs, then we must continue the child now. | |
1646 | Else, give any vfork catchpoints a chance to trigger now. */ | |
1647 | else | |
1648 | { | |
1649 | pending_follow.fork_event.saw_child_fork = 1; | |
1650 | pending_follow.fork_event.child_pid = ecs->pid; | |
1651 | pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid; | |
1652 | target_post_startup_inferior (pending_follow.fork_event.child_pid); | |
1653 | follow_vfork_when_exec = !target_can_follow_vfork_prior_to_exec (); | |
1654 | if (follow_vfork_when_exec) | |
1655 | { | |
1656 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1657 | prepare_to_wait (ecs); |
1658 | return; | |
c5aa993b JM |
1659 | } |
1660 | } | |
c906108c | 1661 | |
c5aa993b | 1662 | stop_pc = read_pc (); |
6426a772 | 1663 | stop_bpstat = bpstat_stop_status (&stop_pc, currently_stepping (ecs)); |
c5aa993b JM |
1664 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1665 | goto process_event_stop_test; | |
1666 | ||
1667 | case TARGET_WAITKIND_EXECD: | |
1668 | stop_signal = TARGET_SIGNAL_TRAP; | |
1669 | ||
1670 | /* Is this a target which reports multiple exec events per actual | |
1671 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1672 | ignore all but the last one. Just resume the exec'r, and wait | |
1673 | for the next exec event. */ | |
1674 | if (inferior_ignoring_leading_exec_events) | |
1675 | { | |
1676 | inferior_ignoring_leading_exec_events--; | |
1677 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1678 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.parent_pid); | |
1679 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1680 | prepare_to_wait (ecs); |
1681 | return; | |
c5aa993b JM |
1682 | } |
1683 | inferior_ignoring_leading_exec_events = | |
1684 | target_reported_exec_events_per_exec_call () - 1; | |
c906108c | 1685 | |
96baa820 JM |
1686 | pending_follow.execd_pathname = |
1687 | savestring (ecs->ws.value.execd_pathname, | |
1688 | strlen (ecs->ws.value.execd_pathname)); | |
c906108c | 1689 | |
c5aa993b JM |
1690 | /* Did inferior_pid exec, or did a (possibly not-yet-followed) |
1691 | child of a vfork exec? | |
c906108c | 1692 | |
c5aa993b JM |
1693 | ??rehrauer: This is unabashedly an HP-UX specific thing. On |
1694 | HP-UX, events associated with a vforking inferior come in | |
1695 | threes: a vfork event for the child (always first), followed | |
1696 | a vfork event for the parent and an exec event for the child. | |
1697 | The latter two can come in either order. | |
c906108c | 1698 | |
c5aa993b JM |
1699 | If we get the parent vfork event first, life's good: We follow |
1700 | either the parent or child, and then the child's exec event is | |
1701 | a "don't care". | |
c906108c | 1702 | |
c5aa993b JM |
1703 | But if we get the child's exec event first, then we delay |
1704 | responding to it until we handle the parent's vfork. Because, | |
1705 | otherwise we can't satisfy a "catch vfork". */ | |
1706 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1707 | { | |
1708 | pending_follow.fork_event.saw_child_exec = 1; | |
1709 | ||
1710 | /* On some targets, the child must be resumed before | |
1711 | the parent vfork event is delivered. A single-step | |
1712 | suffices. */ | |
1713 | if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ()) | |
1714 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
1715 | /* We expect the parent vfork event to be available now. */ | |
104c1213 JM |
1716 | prepare_to_wait (ecs); |
1717 | return; | |
c5aa993b | 1718 | } |
c906108c | 1719 | |
c5aa993b JM |
1720 | /* This causes the eventpoints and symbol table to be reset. Must |
1721 | do this now, before trying to determine whether to stop. */ | |
1722 | follow_exec (inferior_pid, pending_follow.execd_pathname); | |
b8c9b27d | 1723 | xfree (pending_follow.execd_pathname); |
c5aa993b JM |
1724 | |
1725 | stop_pc = read_pc_pid (ecs->pid); | |
1726 | ecs->saved_inferior_pid = inferior_pid; | |
1727 | inferior_pid = ecs->pid; | |
6426a772 | 1728 | stop_bpstat = bpstat_stop_status (&stop_pc, currently_stepping (ecs)); |
c5aa993b JM |
1729 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1730 | inferior_pid = ecs->saved_inferior_pid; | |
1731 | goto process_event_stop_test; | |
1732 | ||
1733 | /* These syscall events are returned on HP-UX, as part of its | |
1734 | implementation of page-protection-based "hardware" watchpoints. | |
1735 | HP-UX has unfortunate interactions between page-protections and | |
1736 | some system calls. Our solution is to disable hardware watches | |
1737 | when a system call is entered, and reenable them when the syscall | |
1738 | completes. The downside of this is that we may miss the precise | |
1739 | point at which a watched piece of memory is modified. "Oh well." | |
1740 | ||
1741 | Note that we may have multiple threads running, which may each | |
1742 | enter syscalls at roughly the same time. Since we don't have a | |
1743 | good notion currently of whether a watched piece of memory is | |
1744 | thread-private, we'd best not have any page-protections active | |
1745 | when any thread is in a syscall. Thus, we only want to reenable | |
1746 | hardware watches when no threads are in a syscall. | |
1747 | ||
1748 | Also, be careful not to try to gather much state about a thread | |
1749 | that's in a syscall. It's frequently a losing proposition. */ | |
1750 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
1751 | number_of_threads_in_syscalls++; | |
1752 | if (number_of_threads_in_syscalls == 1) | |
1753 | { | |
1754 | TARGET_DISABLE_HW_WATCHPOINTS (inferior_pid); | |
1755 | } | |
1756 | resume (0, TARGET_SIGNAL_0); | |
104c1213 JM |
1757 | prepare_to_wait (ecs); |
1758 | return; | |
c906108c | 1759 | |
c5aa993b | 1760 | /* Before examining the threads further, step this thread to |
c906108c SS |
1761 | get it entirely out of the syscall. (We get notice of the |
1762 | event when the thread is just on the verge of exiting a | |
1763 | syscall. Stepping one instruction seems to get it back | |
1764 | into user code.) | |
1765 | ||
1766 | Note that although the logical place to reenable h/w watches | |
1767 | is here, we cannot. We cannot reenable them before stepping | |
1768 | the thread (this causes the next wait on the thread to hang). | |
1769 | ||
1770 | Nor can we enable them after stepping until we've done a wait. | |
cd0fc7c3 | 1771 | Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait |
c906108c SS |
1772 | here, which will be serviced immediately after the target |
1773 | is waited on. */ | |
c5aa993b JM |
1774 | case TARGET_WAITKIND_SYSCALL_RETURN: |
1775 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
c906108c | 1776 | |
c5aa993b JM |
1777 | if (number_of_threads_in_syscalls > 0) |
1778 | { | |
1779 | number_of_threads_in_syscalls--; | |
1780 | ecs->enable_hw_watchpoints_after_wait = | |
1781 | (number_of_threads_in_syscalls == 0); | |
1782 | } | |
104c1213 JM |
1783 | prepare_to_wait (ecs); |
1784 | return; | |
c906108c | 1785 | |
c5aa993b JM |
1786 | case TARGET_WAITKIND_STOPPED: |
1787 | stop_signal = ecs->ws.value.sig; | |
1788 | break; | |
c4093a6a JM |
1789 | |
1790 | /* We had an event in the inferior, but we are not interested | |
1791 | in handling it at this level. The lower layers have already | |
1792 | done what needs to be done, if anything. This case can | |
1793 | occur only when the target is async or extended-async. One | |
1794 | of the circumstamces for this to happen is when the | |
1795 | inferior produces output for the console. The inferior has | |
1796 | not stopped, and we are ignoring the event. */ | |
1797 | case TARGET_WAITKIND_IGNORE: | |
1798 | ecs->wait_some_more = 1; | |
1799 | return; | |
c5aa993b | 1800 | } |
c906108c | 1801 | |
c5aa993b JM |
1802 | /* We may want to consider not doing a resume here in order to give |
1803 | the user a chance to play with the new thread. It might be good | |
1804 | to make that a user-settable option. */ | |
c906108c | 1805 | |
c5aa993b JM |
1806 | /* At this point, all threads are stopped (happens automatically in |
1807 | either the OS or the native code). Therefore we need to continue | |
1808 | all threads in order to make progress. */ | |
1809 | if (ecs->new_thread_event) | |
1810 | { | |
1811 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1812 | prepare_to_wait (ecs); |
1813 | return; | |
c5aa993b | 1814 | } |
c906108c | 1815 | |
c5aa993b | 1816 | stop_pc = read_pc_pid (ecs->pid); |
c906108c | 1817 | |
c5aa993b JM |
1818 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1819 | another thread. If so, then step that thread past the breakpoint, | |
1820 | and continue it. */ | |
c906108c | 1821 | |
c5aa993b JM |
1822 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1823 | { | |
b0ed3589 | 1824 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
c5aa993b JM |
1825 | ecs->random_signal = 0; |
1826 | else if (breakpoints_inserted | |
1827 | && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK)) | |
1828 | { | |
cd0fc7c3 | 1829 | ecs->random_signal = 0; |
c5aa993b JM |
1830 | if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, |
1831 | ecs->pid)) | |
1832 | { | |
1833 | int remove_status; | |
1834 | ||
1835 | /* Saw a breakpoint, but it was hit by the wrong thread. | |
1836 | Just continue. */ | |
1837 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, ecs->pid); | |
1838 | ||
1839 | remove_status = remove_breakpoints (); | |
1840 | /* Did we fail to remove breakpoints? If so, try | |
1841 | to set the PC past the bp. (There's at least | |
1842 | one situation in which we can fail to remove | |
1843 | the bp's: On HP-UX's that use ttrace, we can't | |
1844 | change the address space of a vforking child | |
1845 | process until the child exits (well, okay, not | |
1846 | then either :-) or execs. */ | |
1847 | if (remove_status != 0) | |
1848 | { | |
1849 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, ecs->pid); | |
1850 | } | |
1851 | else | |
1852 | { /* Single step */ | |
1853 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
1854 | /* FIXME: What if a signal arrives instead of the | |
1855 | single-step happening? */ | |
1856 | ||
1857 | ecs->waiton_pid = ecs->pid; | |
1858 | ecs->wp = &(ecs->ws); | |
1859 | ecs->infwait_state = infwait_thread_hop_state; | |
104c1213 JM |
1860 | prepare_to_wait (ecs); |
1861 | return; | |
c5aa993b | 1862 | } |
c906108c | 1863 | |
c5aa993b JM |
1864 | /* We need to restart all the threads now, |
1865 | * unles we're running in scheduler-locked mode. | |
1866 | * FIXME: shouldn't we look at currently_stepping ()? | |
1867 | */ | |
1868 | if (scheduler_mode == schedlock_on) | |
1869 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
1870 | else | |
1871 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1872 | prepare_to_wait (ecs); |
1873 | return; | |
c5aa993b JM |
1874 | } |
1875 | else | |
1876 | { | |
1877 | /* This breakpoint matches--either it is the right | |
1878 | thread or it's a generic breakpoint for all threads. | |
1879 | Remember that we'll need to step just _this_ thread | |
1880 | on any following user continuation! */ | |
1881 | thread_step_needed = 1; | |
1882 | } | |
1883 | } | |
1884 | } | |
1885 | else | |
1886 | ecs->random_signal = 1; | |
1887 | ||
1888 | /* See if something interesting happened to the non-current thread. If | |
1889 | so, then switch to that thread, and eventually give control back to | |
1890 | the user. | |
1891 | ||
1892 | Note that if there's any kind of pending follow (i.e., of a fork, | |
1893 | vfork or exec), we don't want to do this now. Rather, we'll let | |
1894 | the next resume handle it. */ | |
1895 | if ((ecs->pid != inferior_pid) && | |
1896 | (pending_follow.kind == TARGET_WAITKIND_SPURIOUS)) | |
1897 | { | |
1898 | int printed = 0; | |
c906108c | 1899 | |
c5aa993b JM |
1900 | /* If it's a random signal for a non-current thread, notify user |
1901 | if he's expressed an interest. */ | |
1902 | if (ecs->random_signal | |
1903 | && signal_print[stop_signal]) | |
1904 | { | |
c906108c SS |
1905 | /* ??rehrauer: I don't understand the rationale for this code. If the |
1906 | inferior will stop as a result of this signal, then the act of handling | |
1907 | the stop ought to print a message that's couches the stoppage in user | |
1908 | terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior | |
1909 | won't stop as a result of the signal -- i.e., if the signal is merely | |
1910 | a side-effect of something GDB's doing "under the covers" for the | |
1911 | user, such as stepping threads over a breakpoint they shouldn't stop | |
1912 | for -- then the message seems to be a serious annoyance at best. | |
1913 | ||
1914 | For now, remove the message altogether. */ | |
1915 | #if 0 | |
c5aa993b JM |
1916 | printed = 1; |
1917 | target_terminal_ours_for_output (); | |
1918 | printf_filtered ("\nProgram received signal %s, %s.\n", | |
1919 | target_signal_to_name (stop_signal), | |
1920 | target_signal_to_string (stop_signal)); | |
1921 | gdb_flush (gdb_stdout); | |
c906108c | 1922 | #endif |
c5aa993b | 1923 | } |
c906108c | 1924 | |
c5aa993b JM |
1925 | /* If it's not SIGTRAP and not a signal we want to stop for, then |
1926 | continue the thread. */ | |
c906108c | 1927 | |
c5aa993b JM |
1928 | if (stop_signal != TARGET_SIGNAL_TRAP |
1929 | && !signal_stop[stop_signal]) | |
1930 | { | |
1931 | if (printed) | |
1932 | target_terminal_inferior (); | |
c906108c | 1933 | |
c5aa993b JM |
1934 | /* Clear the signal if it should not be passed. */ |
1935 | if (signal_program[stop_signal] == 0) | |
1936 | stop_signal = TARGET_SIGNAL_0; | |
c906108c | 1937 | |
c5aa993b | 1938 | target_resume (ecs->pid, 0, stop_signal); |
104c1213 JM |
1939 | prepare_to_wait (ecs); |
1940 | return; | |
c5aa993b | 1941 | } |
c906108c | 1942 | |
c5aa993b JM |
1943 | /* It's a SIGTRAP or a signal we're interested in. Switch threads, |
1944 | and fall into the rest of wait_for_inferior(). */ | |
1945 | ||
c2d11a7d JM |
1946 | /* Caution: it may happen that the new thread (or the old one!) |
1947 | is not in the thread list. In this case we must not attempt | |
1948 | to "switch context", or we run the risk that our context may | |
1949 | be lost. This may happen as a result of the target module | |
1950 | mishandling thread creation. */ | |
1951 | ||
1952 | if (in_thread_list (inferior_pid) && in_thread_list (ecs->pid)) | |
1953 | { /* Perform infrun state context switch: */ | |
1954 | /* Save infrun state for the old thread. */ | |
1955 | save_infrun_state (inferior_pid, prev_pc, | |
1956 | prev_func_start, prev_func_name, | |
1957 | trap_expected, step_resume_breakpoint, | |
1958 | through_sigtramp_breakpoint, | |
1959 | step_range_start, step_range_end, | |
1960 | step_frame_address, ecs->handling_longjmp, | |
1961 | ecs->another_trap, | |
1962 | ecs->stepping_through_solib_after_catch, | |
1963 | ecs->stepping_through_solib_catchpoints, | |
1964 | ecs->stepping_through_sigtramp); | |
1965 | ||
1966 | /* Load infrun state for the new thread. */ | |
1967 | load_infrun_state (ecs->pid, &prev_pc, | |
1968 | &prev_func_start, &prev_func_name, | |
1969 | &trap_expected, &step_resume_breakpoint, | |
1970 | &through_sigtramp_breakpoint, | |
1971 | &step_range_start, &step_range_end, | |
1972 | &step_frame_address, &ecs->handling_longjmp, | |
1973 | &ecs->another_trap, | |
1974 | &ecs->stepping_through_solib_after_catch, | |
1975 | &ecs->stepping_through_solib_catchpoints, | |
1976 | &ecs->stepping_through_sigtramp); | |
1977 | } | |
c5aa993b JM |
1978 | |
1979 | inferior_pid = ecs->pid; | |
1980 | ||
c5aa993b JM |
1981 | if (context_hook) |
1982 | context_hook (pid_to_thread_id (ecs->pid)); | |
1983 | ||
c5aa993b JM |
1984 | flush_cached_frames (); |
1985 | } | |
c906108c | 1986 | |
b0ed3589 | 1987 | if (SOFTWARE_SINGLE_STEP_P () && singlestep_breakpoints_inserted_p) |
c5aa993b JM |
1988 | { |
1989 | /* Pull the single step breakpoints out of the target. */ | |
1990 | SOFTWARE_SINGLE_STEP (0, 0); | |
1991 | singlestep_breakpoints_inserted_p = 0; | |
1992 | } | |
c906108c | 1993 | |
c5aa993b JM |
1994 | /* If PC is pointing at a nullified instruction, then step beyond |
1995 | it so that the user won't be confused when GDB appears to be ready | |
1996 | to execute it. */ | |
c906108c | 1997 | |
c5aa993b JM |
1998 | /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */ |
1999 | if (INSTRUCTION_NULLIFIED) | |
2000 | { | |
2001 | registers_changed (); | |
2002 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
c906108c | 2003 | |
c5aa993b JM |
2004 | /* We may have received a signal that we want to pass to |
2005 | the inferior; therefore, we must not clobber the waitstatus | |
2006 | in WS. */ | |
c906108c | 2007 | |
c5aa993b JM |
2008 | ecs->infwait_state = infwait_nullified_state; |
2009 | ecs->waiton_pid = ecs->pid; | |
2010 | ecs->wp = &(ecs->tmpstatus); | |
104c1213 JM |
2011 | prepare_to_wait (ecs); |
2012 | return; | |
c5aa993b | 2013 | } |
c906108c | 2014 | |
c5aa993b JM |
2015 | /* It may not be necessary to disable the watchpoint to stop over |
2016 | it. For example, the PA can (with some kernel cooperation) | |
2017 | single step over a watchpoint without disabling the watchpoint. */ | |
2018 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
2019 | { | |
2020 | resume (1, 0); | |
104c1213 JM |
2021 | prepare_to_wait (ecs); |
2022 | return; | |
c5aa993b | 2023 | } |
c906108c | 2024 | |
c5aa993b JM |
2025 | /* It is far more common to need to disable a watchpoint to step |
2026 | the inferior over it. FIXME. What else might a debug | |
2027 | register or page protection watchpoint scheme need here? */ | |
2028 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
2029 | { | |
2030 | /* At this point, we are stopped at an instruction which has | |
2031 | attempted to write to a piece of memory under control of | |
2032 | a watchpoint. The instruction hasn't actually executed | |
2033 | yet. If we were to evaluate the watchpoint expression | |
2034 | now, we would get the old value, and therefore no change | |
2035 | would seem to have occurred. | |
2036 | ||
2037 | In order to make watchpoints work `right', we really need | |
2038 | to complete the memory write, and then evaluate the | |
2039 | watchpoint expression. The following code does that by | |
2040 | removing the watchpoint (actually, all watchpoints and | |
2041 | breakpoints), single-stepping the target, re-inserting | |
2042 | watchpoints, and then falling through to let normal | |
2043 | single-step processing handle proceed. Since this | |
2044 | includes evaluating watchpoints, things will come to a | |
2045 | stop in the correct manner. */ | |
2046 | ||
2047 | write_pc (stop_pc - DECR_PC_AFTER_BREAK); | |
2048 | ||
2049 | remove_breakpoints (); | |
2050 | registers_changed (); | |
2051 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); /* Single step */ | |
2052 | ||
2053 | ecs->waiton_pid = ecs->pid; | |
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. */ | |
2128 | stop_bpstat = bpstat_stop_status | |
2129 | (&stop_pc, | |
6426a772 JM |
2130 | /* Pass TRUE if our reason for stopping is something other |
2131 | than hitting a breakpoint. We do this by checking that | |
2132 | 1) stepping is going on and 2) we didn't hit a breakpoint | |
2133 | in a signal handler without an intervening stop in | |
2134 | sigtramp, which is detected by a new stack pointer value | |
2135 | below any usual function calling stack adjustments. */ | |
c5aa993b | 2136 | (currently_stepping (ecs) |
c5aa993b | 2137 | && !(step_range_end |
6426a772 | 2138 | && INNER_THAN (read_sp (), (step_sp - 16)))) |
c5aa993b JM |
2139 | ); |
2140 | /* Following in case break condition called a | |
2141 | function. */ | |
2142 | stop_print_frame = 1; | |
2143 | } | |
c906108c | 2144 | |
c5aa993b JM |
2145 | if (stop_signal == TARGET_SIGNAL_TRAP) |
2146 | ecs->random_signal | |
2147 | = !(bpstat_explains_signal (stop_bpstat) | |
2148 | || trap_expected | |
2149 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P | |
2150 | && PC_IN_CALL_DUMMY (stop_pc, read_sp (), | |
2151 | FRAME_FP (get_current_frame ()))) | |
2152 | || (step_range_end && step_resume_breakpoint == NULL)); | |
2153 | ||
2154 | else | |
2155 | { | |
cd0fc7c3 | 2156 | ecs->random_signal |
c906108c | 2157 | = !(bpstat_explains_signal (stop_bpstat) |
c5aa993b JM |
2158 | /* End of a stack dummy. Some systems (e.g. Sony |
2159 | news) give another signal besides SIGTRAP, so | |
2160 | check here as well as above. */ | |
7a292a7a SS |
2161 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P |
2162 | && PC_IN_CALL_DUMMY (stop_pc, read_sp (), | |
2163 | FRAME_FP (get_current_frame ()))) | |
c5aa993b JM |
2164 | ); |
2165 | if (!ecs->random_signal) | |
2166 | stop_signal = TARGET_SIGNAL_TRAP; | |
2167 | } | |
2168 | } | |
c906108c | 2169 | |
c5aa993b JM |
2170 | /* When we reach this point, we've pretty much decided |
2171 | that the reason for stopping must've been a random | |
2172 | (unexpected) signal. */ | |
2173 | ||
2174 | else | |
2175 | ecs->random_signal = 1; | |
2176 | /* If a fork, vfork or exec event was seen, then there are two | |
2177 | possible responses we can make: | |
2178 | ||
2179 | 1. If a catchpoint triggers for the event (ecs->random_signal == 0), | |
2180 | then we must stop now and issue a prompt. We will resume | |
2181 | the inferior when the user tells us to. | |
2182 | 2. If no catchpoint triggers for the event (ecs->random_signal == 1), | |
2183 | then we must resume the inferior now and keep checking. | |
2184 | ||
2185 | In either case, we must take appropriate steps to "follow" the | |
2186 | the fork/vfork/exec when the inferior is resumed. For example, | |
2187 | if follow-fork-mode is "child", then we must detach from the | |
2188 | parent inferior and follow the new child inferior. | |
2189 | ||
2190 | In either case, setting pending_follow causes the next resume() | |
2191 | to take the appropriate following action. */ | |
2192 | process_event_stop_test: | |
2193 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
2194 | { | |
2195 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
2196 | { | |
2197 | trap_expected = 1; | |
2198 | stop_signal = TARGET_SIGNAL_0; | |
d4f3574e SS |
2199 | keep_going (ecs); |
2200 | return; | |
c5aa993b JM |
2201 | } |
2202 | } | |
2203 | else if (ecs->ws.kind == TARGET_WAITKIND_VFORKED) | |
2204 | { | |
2205 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
2206 | { | |
d4f3574e SS |
2207 | stop_signal = TARGET_SIGNAL_0; |
2208 | keep_going (ecs); | |
2209 | return; | |
c5aa993b JM |
2210 | } |
2211 | } | |
2212 | else if (ecs->ws.kind == TARGET_WAITKIND_EXECD) | |
2213 | { | |
2214 | pending_follow.kind = ecs->ws.kind; | |
2215 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
2216 | { | |
2217 | trap_expected = 1; | |
2218 | stop_signal = TARGET_SIGNAL_0; | |
d4f3574e SS |
2219 | keep_going (ecs); |
2220 | return; | |
c5aa993b JM |
2221 | } |
2222 | } | |
c906108c | 2223 | |
c5aa993b JM |
2224 | /* For the program's own signals, act according to |
2225 | the signal handling tables. */ | |
c906108c | 2226 | |
c5aa993b JM |
2227 | if (ecs->random_signal) |
2228 | { | |
2229 | /* Signal not for debugging purposes. */ | |
2230 | int printed = 0; | |
2231 | ||
2232 | stopped_by_random_signal = 1; | |
2233 | ||
2234 | if (signal_print[stop_signal]) | |
2235 | { | |
2236 | printed = 1; | |
2237 | target_terminal_ours_for_output (); | |
11cf8741 | 2238 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); |
c5aa993b JM |
2239 | } |
2240 | if (signal_stop[stop_signal]) | |
104c1213 JM |
2241 | { |
2242 | stop_stepping (ecs); | |
2243 | return; | |
2244 | } | |
c5aa993b JM |
2245 | /* If not going to stop, give terminal back |
2246 | if we took it away. */ | |
2247 | else if (printed) | |
2248 | target_terminal_inferior (); | |
2249 | ||
2250 | /* Clear the signal if it should not be passed. */ | |
2251 | if (signal_program[stop_signal] == 0) | |
2252 | stop_signal = TARGET_SIGNAL_0; | |
2253 | ||
a0b3c4fd JM |
2254 | /* I'm not sure whether this needs to be check_sigtramp2 or |
2255 | whether it could/should be keep_going. | |
2256 | ||
2257 | This used to jump to step_over_function if we are stepping, | |
2258 | which is wrong. | |
2259 | ||
2260 | Suppose the user does a `next' over a function call, and while | |
2261 | that call is in progress, the inferior receives a signal for | |
2262 | which GDB does not stop (i.e., signal_stop[SIG] is false). In | |
2263 | that case, when we reach this point, there is already a | |
2264 | step-resume breakpoint established, right where it should be: | |
2265 | immediately after the function call the user is "next"-ing | |
d4f3574e | 2266 | over. If we call step_over_function now, two bad things |
a0b3c4fd JM |
2267 | happen: |
2268 | ||
2269 | - we'll create a new breakpoint, at wherever the current | |
2270 | frame's return address happens to be. That could be | |
2271 | anywhere, depending on what function call happens to be on | |
2272 | the top of the stack at that point. Point is, it's probably | |
2273 | not where we need it. | |
2274 | ||
2275 | - the existing step-resume breakpoint (which is at the correct | |
2276 | address) will get orphaned: step_resume_breakpoint will point | |
2277 | to the new breakpoint, and the old step-resume breakpoint | |
2278 | will never be cleaned up. | |
2279 | ||
2280 | The old behavior was meant to help HP-UX single-step out of | |
2281 | sigtramps. It would place the new breakpoint at prev_pc, which | |
2282 | was certainly wrong. I don't know the details there, so fixing | |
2283 | this probably breaks that. As with anything else, it's up to | |
2284 | the HP-UX maintainer to furnish a fix that doesn't break other | |
2285 | platforms. --JimB, 20 May 1999 */ | |
104c1213 | 2286 | check_sigtramp2 (ecs); |
e441088d MK |
2287 | keep_going (ecs); |
2288 | return; | |
c5aa993b JM |
2289 | } |
2290 | ||
2291 | /* Handle cases caused by hitting a breakpoint. */ | |
2292 | { | |
2293 | CORE_ADDR jmp_buf_pc; | |
2294 | struct bpstat_what what; | |
2295 | ||
2296 | what = bpstat_what (stop_bpstat); | |
2297 | ||
2298 | if (what.call_dummy) | |
c906108c | 2299 | { |
c5aa993b JM |
2300 | stop_stack_dummy = 1; |
2301 | #ifdef HP_OS_BUG | |
2302 | trap_expected_after_continue = 1; | |
2303 | #endif | |
c906108c | 2304 | } |
c5aa993b JM |
2305 | |
2306 | switch (what.main_action) | |
c906108c | 2307 | { |
c5aa993b JM |
2308 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2309 | /* If we hit the breakpoint at longjmp, disable it for the | |
2310 | duration of this command. Then, install a temporary | |
2311 | breakpoint at the target of the jmp_buf. */ | |
2312 | disable_longjmp_breakpoint (); | |
2313 | remove_breakpoints (); | |
2314 | breakpoints_inserted = 0; | |
2315 | if (!GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
d4f3574e SS |
2316 | { |
2317 | keep_going (ecs); | |
2318 | return; | |
2319 | } | |
c5aa993b JM |
2320 | |
2321 | /* Need to blow away step-resume breakpoint, as it | |
2322 | interferes with us */ | |
2323 | if (step_resume_breakpoint != NULL) | |
c906108c | 2324 | { |
c5aa993b JM |
2325 | delete_breakpoint (step_resume_breakpoint); |
2326 | step_resume_breakpoint = NULL; | |
c906108c | 2327 | } |
c5aa993b JM |
2328 | /* Not sure whether we need to blow this away too, but probably |
2329 | it is like the step-resume breakpoint. */ | |
2330 | if (through_sigtramp_breakpoint != NULL) | |
c906108c | 2331 | { |
c5aa993b JM |
2332 | delete_breakpoint (through_sigtramp_breakpoint); |
2333 | through_sigtramp_breakpoint = NULL; | |
c906108c | 2334 | } |
c906108c | 2335 | |
c5aa993b JM |
2336 | #if 0 |
2337 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2338 | if (step_over_calls > 0) | |
2339 | set_longjmp_resume_breakpoint (jmp_buf_pc, | |
2340 | get_current_frame ()); | |
2341 | else | |
2342 | #endif /* 0 */ | |
2343 | set_longjmp_resume_breakpoint (jmp_buf_pc, NULL); | |
2344 | ecs->handling_longjmp = 1; /* FIXME */ | |
d4f3574e SS |
2345 | keep_going (ecs); |
2346 | return; | |
c906108c | 2347 | |
c5aa993b JM |
2348 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2349 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
2350 | remove_breakpoints (); | |
2351 | breakpoints_inserted = 0; | |
2352 | #if 0 | |
2353 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2354 | if (step_over_calls | |
2355 | && (INNER_THAN (FRAME_FP (get_current_frame ()), | |
2356 | step_frame_address))) | |
2357 | { | |
2358 | ecs->another_trap = 1; | |
d4f3574e SS |
2359 | keep_going (ecs); |
2360 | return; | |
c5aa993b JM |
2361 | } |
2362 | #endif /* 0 */ | |
2363 | disable_longjmp_breakpoint (); | |
2364 | ecs->handling_longjmp = 0; /* FIXME */ | |
2365 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2366 | break; | |
2367 | /* else fallthrough */ | |
c906108c | 2368 | |
c5aa993b JM |
2369 | case BPSTAT_WHAT_SINGLE: |
2370 | if (breakpoints_inserted) | |
c906108c | 2371 | { |
c5aa993b JM |
2372 | thread_step_needed = 1; |
2373 | remove_breakpoints (); | |
c906108c | 2374 | } |
c5aa993b JM |
2375 | breakpoints_inserted = 0; |
2376 | ecs->another_trap = 1; | |
2377 | /* Still need to check other stuff, at least the case | |
2378 | where we are stepping and step out of the right range. */ | |
2379 | break; | |
c906108c | 2380 | |
c5aa993b JM |
2381 | case BPSTAT_WHAT_STOP_NOISY: |
2382 | stop_print_frame = 1; | |
c906108c | 2383 | |
c5aa993b JM |
2384 | /* We are about to nuke the step_resume_breakpoint and |
2385 | through_sigtramp_breakpoint via the cleanup chain, so | |
2386 | no need to worry about it here. */ | |
c906108c | 2387 | |
104c1213 JM |
2388 | stop_stepping (ecs); |
2389 | return; | |
c906108c | 2390 | |
c5aa993b JM |
2391 | case BPSTAT_WHAT_STOP_SILENT: |
2392 | stop_print_frame = 0; | |
c906108c | 2393 | |
c5aa993b JM |
2394 | /* We are about to nuke the step_resume_breakpoint and |
2395 | through_sigtramp_breakpoint via the cleanup chain, so | |
2396 | no need to worry about it here. */ | |
c906108c | 2397 | |
104c1213 JM |
2398 | stop_stepping (ecs); |
2399 | return; | |
c906108c | 2400 | |
c5aa993b JM |
2401 | case BPSTAT_WHAT_STEP_RESUME: |
2402 | /* This proably demands a more elegant solution, but, yeah | |
2403 | right... | |
2404 | ||
2405 | This function's use of the simple variable | |
2406 | step_resume_breakpoint doesn't seem to accomodate | |
2407 | simultaneously active step-resume bp's, although the | |
2408 | breakpoint list certainly can. | |
2409 | ||
2410 | If we reach here and step_resume_breakpoint is already | |
2411 | NULL, then apparently we have multiple active | |
2412 | step-resume bp's. We'll just delete the breakpoint we | |
53a5351d JM |
2413 | stopped at, and carry on. |
2414 | ||
2415 | Correction: what the code currently does is delete a | |
2416 | step-resume bp, but it makes no effort to ensure that | |
2417 | the one deleted is the one currently stopped at. MVS */ | |
2418 | ||
c5aa993b JM |
2419 | if (step_resume_breakpoint == NULL) |
2420 | { | |
2421 | step_resume_breakpoint = | |
2422 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2423 | } | |
2424 | delete_breakpoint (step_resume_breakpoint); | |
2425 | step_resume_breakpoint = NULL; | |
2426 | break; | |
2427 | ||
2428 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
2429 | if (through_sigtramp_breakpoint) | |
2430 | delete_breakpoint (through_sigtramp_breakpoint); | |
2431 | through_sigtramp_breakpoint = NULL; | |
2432 | ||
2433 | /* If were waiting for a trap, hitting the step_resume_break | |
2434 | doesn't count as getting it. */ | |
2435 | if (trap_expected) | |
2436 | ecs->another_trap = 1; | |
2437 | break; | |
c906108c | 2438 | |
c5aa993b JM |
2439 | case BPSTAT_WHAT_CHECK_SHLIBS: |
2440 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2441 | #ifdef SOLIB_ADD | |
c906108c | 2442 | { |
c5aa993b JM |
2443 | /* Remove breakpoints, we eventually want to step over the |
2444 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2445 | breakpoint addresses via breakpoint_re_set. */ | |
2446 | if (breakpoints_inserted) | |
2447 | remove_breakpoints (); | |
c906108c | 2448 | breakpoints_inserted = 0; |
c906108c | 2449 | |
c5aa993b JM |
2450 | /* Check for any newly added shared libraries if we're |
2451 | supposed to be adding them automatically. */ | |
2452 | if (auto_solib_add) | |
c906108c | 2453 | { |
c5aa993b JM |
2454 | /* Switch terminal for any messages produced by |
2455 | breakpoint_re_set. */ | |
2456 | target_terminal_ours_for_output (); | |
2457 | SOLIB_ADD (NULL, 0, NULL); | |
2458 | target_terminal_inferior (); | |
c906108c | 2459 | } |
c5aa993b JM |
2460 | |
2461 | /* Try to reenable shared library breakpoints, additional | |
2462 | code segments in shared libraries might be mapped in now. */ | |
2463 | re_enable_breakpoints_in_shlibs (); | |
2464 | ||
2465 | /* If requested, stop when the dynamic linker notifies | |
2466 | gdb of events. This allows the user to get control | |
2467 | and place breakpoints in initializer routines for | |
2468 | dynamically loaded objects (among other things). */ | |
2469 | if (stop_on_solib_events) | |
c906108c | 2470 | { |
104c1213 JM |
2471 | stop_stepping (ecs); |
2472 | return; | |
c906108c SS |
2473 | } |
2474 | ||
c5aa993b JM |
2475 | /* If we stopped due to an explicit catchpoint, then the |
2476 | (see above) call to SOLIB_ADD pulled in any symbols | |
2477 | from a newly-loaded library, if appropriate. | |
2478 | ||
2479 | We do want the inferior to stop, but not where it is | |
2480 | now, which is in the dynamic linker callback. Rather, | |
2481 | we would like it stop in the user's program, just after | |
2482 | the call that caused this catchpoint to trigger. That | |
2483 | gives the user a more useful vantage from which to | |
2484 | examine their program's state. */ | |
2485 | else if (what.main_action == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
2486 | { | |
2487 | /* ??rehrauer: If I could figure out how to get the | |
2488 | right return PC from here, we could just set a temp | |
2489 | breakpoint and resume. I'm not sure we can without | |
2490 | cracking open the dld's shared libraries and sniffing | |
2491 | their unwind tables and text/data ranges, and that's | |
2492 | not a terribly portable notion. | |
2493 | ||
2494 | Until that time, we must step the inferior out of the | |
2495 | dld callback, and also out of the dld itself (and any | |
2496 | code or stubs in libdld.sl, such as "shl_load" and | |
2497 | friends) until we reach non-dld code. At that point, | |
2498 | we can stop stepping. */ | |
2499 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2500 | &ecs->stepping_through_solib_catchpoints); | |
2501 | ecs->stepping_through_solib_after_catch = 1; | |
2502 | ||
2503 | /* Be sure to lift all breakpoints, so the inferior does | |
2504 | actually step past this point... */ | |
2505 | ecs->another_trap = 1; | |
2506 | break; | |
2507 | } | |
2508 | else | |
c906108c | 2509 | { |
c5aa993b | 2510 | /* We want to step over this breakpoint, then keep going. */ |
cd0fc7c3 | 2511 | ecs->another_trap = 1; |
c5aa993b | 2512 | break; |
c906108c | 2513 | } |
c5aa993b JM |
2514 | } |
2515 | #endif | |
2516 | break; | |
c906108c | 2517 | |
c5aa993b JM |
2518 | case BPSTAT_WHAT_LAST: |
2519 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2520 | |
c5aa993b JM |
2521 | case BPSTAT_WHAT_KEEP_CHECKING: |
2522 | break; | |
2523 | } | |
2524 | } | |
c906108c | 2525 | |
c5aa993b JM |
2526 | /* We come here if we hit a breakpoint but should not |
2527 | stop for it. Possibly we also were stepping | |
2528 | and should stop for that. So fall through and | |
2529 | test for stepping. But, if not stepping, | |
2530 | do not stop. */ | |
c906108c | 2531 | |
c5aa993b JM |
2532 | /* Are we stepping to get the inferior out of the dynamic |
2533 | linker's hook (and possibly the dld itself) after catching | |
2534 | a shlib event? */ | |
2535 | if (ecs->stepping_through_solib_after_catch) | |
2536 | { | |
2537 | #if defined(SOLIB_ADD) | |
2538 | /* Have we reached our destination? If not, keep going. */ | |
2539 | if (SOLIB_IN_DYNAMIC_LINKER (ecs->pid, stop_pc)) | |
2540 | { | |
2541 | ecs->another_trap = 1; | |
d4f3574e SS |
2542 | keep_going (ecs); |
2543 | return; | |
c5aa993b JM |
2544 | } |
2545 | #endif | |
2546 | /* Else, stop and report the catchpoint(s) whose triggering | |
2547 | caused us to begin stepping. */ | |
2548 | ecs->stepping_through_solib_after_catch = 0; | |
2549 | bpstat_clear (&stop_bpstat); | |
2550 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2551 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2552 | stop_print_frame = 1; | |
104c1213 JM |
2553 | stop_stepping (ecs); |
2554 | return; | |
c5aa993b | 2555 | } |
c906108c | 2556 | |
c5aa993b JM |
2557 | if (!CALL_DUMMY_BREAKPOINT_OFFSET_P) |
2558 | { | |
2559 | /* This is the old way of detecting the end of the stack dummy. | |
2560 | An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets | |
2561 | handled above. As soon as we can test it on all of them, all | |
2562 | architectures should define it. */ | |
2563 | ||
2564 | /* If this is the breakpoint at the end of a stack dummy, | |
2565 | just stop silently, unless the user was doing an si/ni, in which | |
2566 | case she'd better know what she's doing. */ | |
2567 | ||
2568 | if (CALL_DUMMY_HAS_COMPLETED (stop_pc, read_sp (), | |
2569 | FRAME_FP (get_current_frame ())) | |
2570 | && !step_range_end) | |
2571 | { | |
c906108c | 2572 | stop_print_frame = 0; |
c5aa993b JM |
2573 | stop_stack_dummy = 1; |
2574 | #ifdef HP_OS_BUG | |
2575 | trap_expected_after_continue = 1; | |
2576 | #endif | |
104c1213 JM |
2577 | stop_stepping (ecs); |
2578 | return; | |
c5aa993b JM |
2579 | } |
2580 | } | |
c906108c | 2581 | |
c5aa993b | 2582 | if (step_resume_breakpoint) |
104c1213 JM |
2583 | { |
2584 | /* Having a step-resume breakpoint overrides anything | |
2585 | else having to do with stepping commands until | |
2586 | that breakpoint is reached. */ | |
2587 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2588 | whether it could/should be keep_going. */ | |
2589 | check_sigtramp2 (ecs); | |
d4f3574e SS |
2590 | keep_going (ecs); |
2591 | return; | |
104c1213 JM |
2592 | } |
2593 | ||
c5aa993b | 2594 | if (step_range_end == 0) |
104c1213 JM |
2595 | { |
2596 | /* Likewise if we aren't even stepping. */ | |
2597 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2598 | whether it could/should be keep_going. */ | |
2599 | check_sigtramp2 (ecs); | |
d4f3574e SS |
2600 | keep_going (ecs); |
2601 | return; | |
104c1213 | 2602 | } |
c5aa993b JM |
2603 | |
2604 | /* If stepping through a line, keep going if still within it. | |
2605 | ||
2606 | Note that step_range_end is the address of the first instruction | |
2607 | beyond the step range, and NOT the address of the last instruction | |
2608 | within it! */ | |
2609 | if (stop_pc >= step_range_start | |
2610 | && stop_pc < step_range_end) | |
2611 | { | |
2612 | /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal. | |
2613 | So definately need to check for sigtramp here. */ | |
104c1213 | 2614 | check_sigtramp2 (ecs); |
d4f3574e SS |
2615 | keep_going (ecs); |
2616 | return; | |
c5aa993b | 2617 | } |
c906108c | 2618 | |
c5aa993b | 2619 | /* We stepped out of the stepping range. */ |
c906108c | 2620 | |
c5aa993b JM |
2621 | /* If we are stepping at the source level and entered the runtime |
2622 | loader dynamic symbol resolution code, we keep on single stepping | |
2623 | until we exit the run time loader code and reach the callee's | |
2624 | address. */ | |
5fbbeb29 | 2625 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) |
d4f3574e SS |
2626 | { |
2627 | CORE_ADDR pc_after_resolver = SKIP_SOLIB_RESOLVER (stop_pc); | |
2628 | ||
2629 | if (pc_after_resolver) | |
2630 | { | |
2631 | /* Set up a step-resume breakpoint at the address | |
2632 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2633 | struct symtab_and_line sr_sal; | |
2634 | INIT_SAL (&sr_sal); | |
2635 | sr_sal.pc = pc_after_resolver; | |
2636 | ||
2637 | check_for_old_step_resume_breakpoint (); | |
2638 | step_resume_breakpoint = | |
2639 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2640 | if (breakpoints_inserted) | |
2641 | insert_breakpoints (); | |
2642 | } | |
2643 | ||
2644 | keep_going (ecs); | |
2645 | return; | |
2646 | } | |
c906108c | 2647 | |
c5aa993b JM |
2648 | /* We can't update step_sp every time through the loop, because |
2649 | reading the stack pointer would slow down stepping too much. | |
2650 | But we can update it every time we leave the step range. */ | |
2651 | ecs->update_step_sp = 1; | |
c906108c | 2652 | |
c5aa993b JM |
2653 | /* Did we just take a signal? */ |
2654 | if (IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
2655 | && !IN_SIGTRAMP (prev_pc, prev_func_name) | |
2656 | && INNER_THAN (read_sp (), step_sp)) | |
2657 | { | |
2658 | /* We've just taken a signal; go until we are back to | |
2659 | the point where we took it and one more. */ | |
c906108c | 2660 | |
c5aa993b JM |
2661 | /* Note: The test above succeeds not only when we stepped |
2662 | into a signal handler, but also when we step past the last | |
2663 | statement of a signal handler and end up in the return stub | |
2664 | of the signal handler trampoline. To distinguish between | |
2665 | these two cases, check that the frame is INNER_THAN the | |
2666 | previous one below. pai/1997-09-11 */ | |
c906108c | 2667 | |
c906108c | 2668 | |
c5aa993b JM |
2669 | { |
2670 | CORE_ADDR current_frame = FRAME_FP (get_current_frame ()); | |
c906108c | 2671 | |
c5aa993b JM |
2672 | if (INNER_THAN (current_frame, step_frame_address)) |
2673 | { | |
2674 | /* We have just taken a signal; go until we are back to | |
2675 | the point where we took it and one more. */ | |
c906108c | 2676 | |
c5aa993b JM |
2677 | /* This code is needed at least in the following case: |
2678 | The user types "next" and then a signal arrives (before | |
2679 | the "next" is done). */ | |
c906108c | 2680 | |
c5aa993b JM |
2681 | /* Note that if we are stopped at a breakpoint, then we need |
2682 | the step_resume breakpoint to override any breakpoints at | |
2683 | the same location, so that we will still step over the | |
2684 | breakpoint even though the signal happened. */ | |
2685 | struct symtab_and_line sr_sal; | |
c906108c | 2686 | |
c5aa993b JM |
2687 | INIT_SAL (&sr_sal); |
2688 | sr_sal.symtab = NULL; | |
2689 | sr_sal.line = 0; | |
2690 | sr_sal.pc = prev_pc; | |
2691 | /* We could probably be setting the frame to | |
2692 | step_frame_address; I don't think anyone thought to | |
2693 | try it. */ | |
a0b3c4fd | 2694 | check_for_old_step_resume_breakpoint (); |
c5aa993b JM |
2695 | step_resume_breakpoint = |
2696 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2697 | if (breakpoints_inserted) | |
2698 | insert_breakpoints (); | |
c906108c | 2699 | } |
c5aa993b | 2700 | else |
c906108c | 2701 | { |
c5aa993b JM |
2702 | /* We just stepped out of a signal handler and into |
2703 | its calling trampoline. | |
2704 | ||
d4f3574e | 2705 | Normally, we'd call step_over_function from |
c5aa993b JM |
2706 | here, but for some reason GDB can't unwind the |
2707 | stack correctly to find the real PC for the point | |
2708 | user code where the signal trampoline will return | |
2709 | -- FRAME_SAVED_PC fails, at least on HP-UX 10.20. | |
2710 | But signal trampolines are pretty small stubs of | |
2711 | code, anyway, so it's OK instead to just | |
2712 | single-step out. Note: assuming such trampolines | |
2713 | don't exhibit recursion on any platform... */ | |
2714 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
2715 | &ecs->stop_func_start, | |
2716 | &ecs->stop_func_end); | |
2717 | /* Readjust stepping range */ | |
2718 | step_range_start = ecs->stop_func_start; | |
2719 | step_range_end = ecs->stop_func_end; | |
2720 | ecs->stepping_through_sigtramp = 1; | |
c906108c | 2721 | } |
c906108c SS |
2722 | } |
2723 | ||
c906108c | 2724 | |
c5aa993b JM |
2725 | /* If this is stepi or nexti, make sure that the stepping range |
2726 | gets us past that instruction. */ | |
2727 | if (step_range_end == 1) | |
2728 | /* FIXME: Does this run afoul of the code below which, if | |
2729 | we step into the middle of a line, resets the stepping | |
2730 | range? */ | |
2731 | step_range_end = (step_range_start = prev_pc) + 1; | |
c906108c | 2732 | |
c5aa993b | 2733 | ecs->remove_breakpoints_on_following_step = 1; |
d4f3574e SS |
2734 | keep_going (ecs); |
2735 | return; | |
c5aa993b | 2736 | } |
c906108c | 2737 | |
c5aa993b JM |
2738 | if (stop_pc == ecs->stop_func_start /* Quick test */ |
2739 | || (in_prologue (stop_pc, ecs->stop_func_start) && | |
2740 | !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2741 | || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name) | |
2742 | || ecs->stop_func_name == 0) | |
2743 | { | |
2744 | /* It's a subroutine call. */ | |
c906108c | 2745 | |
5fbbeb29 | 2746 | if (step_over_calls == STEP_OVER_NONE) |
c906108c | 2747 | { |
c5aa993b JM |
2748 | /* I presume that step_over_calls is only 0 when we're |
2749 | supposed to be stepping at the assembly language level | |
2750 | ("stepi"). Just stop. */ | |
2751 | stop_step = 1; | |
11cf8741 | 2752 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2753 | stop_stepping (ecs); |
2754 | return; | |
c5aa993b | 2755 | } |
c906108c | 2756 | |
5fbbeb29 | 2757 | if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc)) |
d4f3574e SS |
2758 | { |
2759 | /* We're doing a "next". */ | |
d41707c8 MK |
2760 | |
2761 | if (IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
2762 | && INNER_THAN (step_frame_address, read_sp())) | |
2763 | /* We stepped out of a signal handler, and into its | |
2764 | calling trampoline. This is misdetected as a | |
2765 | subroutine call, but stepping over the signal | |
2766 | trampoline isn't such a bad idea. In order to do | |
2767 | that, we have to ignore the value in | |
2768 | step_frame_address, since that doesn't represent the | |
2769 | frame that'll reach when we return from the signal | |
2770 | trampoline. Otherwise we'll probably continue to the | |
2771 | end of the program. */ | |
2772 | step_frame_address = 0; | |
2773 | ||
d4f3574e SS |
2774 | step_over_function (ecs); |
2775 | keep_going (ecs); | |
2776 | return; | |
2777 | } | |
c5aa993b JM |
2778 | |
2779 | /* If we are in a function call trampoline (a stub between | |
2780 | the calling routine and the real function), locate the real | |
2781 | function. That's what tells us (a) whether we want to step | |
2782 | into it at all, and (b) what prologue we want to run to | |
2783 | the end of, if we do step into it. */ | |
2784 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2785 | if (tmp != 0) | |
2786 | ecs->stop_func_start = tmp; | |
2787 | else | |
2788 | { | |
2789 | tmp = DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc); | |
2790 | if (tmp) | |
c906108c | 2791 | { |
c5aa993b JM |
2792 | struct symtab_and_line xxx; |
2793 | /* Why isn't this s_a_l called "sr_sal", like all of the | |
2794 | other s_a_l's where this code is duplicated? */ | |
2795 | INIT_SAL (&xxx); /* initialize to zeroes */ | |
2796 | xxx.pc = tmp; | |
2797 | xxx.section = find_pc_overlay (xxx.pc); | |
a0b3c4fd | 2798 | check_for_old_step_resume_breakpoint (); |
c906108c | 2799 | step_resume_breakpoint = |
c5aa993b JM |
2800 | set_momentary_breakpoint (xxx, NULL, bp_step_resume); |
2801 | insert_breakpoints (); | |
d4f3574e SS |
2802 | keep_going (ecs); |
2803 | return; | |
c906108c SS |
2804 | } |
2805 | } | |
2806 | ||
c5aa993b JM |
2807 | /* If we have line number information for the function we |
2808 | are thinking of stepping into, step into it. | |
c906108c | 2809 | |
c5aa993b JM |
2810 | If there are several symtabs at that PC (e.g. with include |
2811 | files), just want to know whether *any* of them have line | |
2812 | numbers. find_pc_line handles this. */ | |
2813 | { | |
2814 | struct symtab_and_line tmp_sal; | |
c906108c | 2815 | |
c5aa993b JM |
2816 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2817 | if (tmp_sal.line != 0) | |
c2c6d25f JM |
2818 | { |
2819 | step_into_function (ecs); | |
2820 | return; | |
2821 | } | |
c906108c | 2822 | } |
5fbbeb29 CF |
2823 | |
2824 | /* If we have no line number and the step-stop-if-no-debug | |
2825 | is set, we stop the step so that the user has a chance to | |
2826 | switch in assembly mode. */ | |
2827 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) | |
2828 | { | |
2829 | stop_step = 1; | |
2830 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2831 | stop_stepping (ecs); | |
2832 | return; | |
2833 | } | |
2834 | ||
d4f3574e SS |
2835 | step_over_function (ecs); |
2836 | keep_going (ecs); | |
2837 | return; | |
c906108c | 2838 | |
c5aa993b | 2839 | } |
c906108c | 2840 | |
c5aa993b | 2841 | /* We've wandered out of the step range. */ |
c906108c | 2842 | |
c5aa993b | 2843 | ecs->sal = find_pc_line (stop_pc, 0); |
c906108c | 2844 | |
c5aa993b JM |
2845 | if (step_range_end == 1) |
2846 | { | |
2847 | /* It is stepi or nexti. We always want to stop stepping after | |
2848 | one instruction. */ | |
2849 | stop_step = 1; | |
11cf8741 | 2850 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2851 | stop_stepping (ecs); |
2852 | return; | |
c5aa993b | 2853 | } |
c906108c | 2854 | |
c5aa993b JM |
2855 | /* If we're in the return path from a shared library trampoline, |
2856 | we want to proceed through the trampoline when stepping. */ | |
2857 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2858 | { | |
2859 | CORE_ADDR tmp; | |
c906108c | 2860 | |
c5aa993b JM |
2861 | /* Determine where this trampoline returns. */ |
2862 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
c906108c | 2863 | |
c5aa993b JM |
2864 | /* Only proceed through if we know where it's going. */ |
2865 | if (tmp) | |
2866 | { | |
2867 | /* And put the step-breakpoint there and go until there. */ | |
2868 | struct symtab_and_line sr_sal; | |
c906108c | 2869 | |
c5aa993b JM |
2870 | INIT_SAL (&sr_sal); /* initialize to zeroes */ |
2871 | sr_sal.pc = tmp; | |
2872 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2873 | /* Do not specify what the fp should be when we stop | |
2874 | since on some machines the prologue | |
2875 | is where the new fp value is established. */ | |
a0b3c4fd | 2876 | check_for_old_step_resume_breakpoint (); |
c5aa993b JM |
2877 | step_resume_breakpoint = |
2878 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2879 | if (breakpoints_inserted) | |
2880 | insert_breakpoints (); | |
c906108c | 2881 | |
c5aa993b JM |
2882 | /* Restart without fiddling with the step ranges or |
2883 | other state. */ | |
d4f3574e SS |
2884 | keep_going (ecs); |
2885 | return; | |
c5aa993b JM |
2886 | } |
2887 | } | |
c906108c | 2888 | |
c5aa993b | 2889 | if (ecs->sal.line == 0) |
c906108c | 2890 | { |
c5aa993b JM |
2891 | /* We have no line number information. That means to stop |
2892 | stepping (does this always happen right after one instruction, | |
2893 | when we do "s" in a function with no line numbers, | |
2894 | or can this happen as a result of a return or longjmp?). */ | |
2895 | stop_step = 1; | |
11cf8741 | 2896 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2897 | stop_stepping (ecs); |
2898 | return; | |
c906108c SS |
2899 | } |
2900 | ||
c5aa993b JM |
2901 | if ((stop_pc == ecs->sal.pc) |
2902 | && (ecs->current_line != ecs->sal.line || ecs->current_symtab != ecs->sal.symtab)) | |
2903 | { | |
2904 | /* We are at the start of a different line. So stop. Note that | |
2905 | we don't stop if we step into the middle of a different line. | |
2906 | That is said to make things like for (;;) statements work | |
2907 | better. */ | |
2908 | stop_step = 1; | |
11cf8741 | 2909 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2910 | stop_stepping (ecs); |
2911 | return; | |
c5aa993b | 2912 | } |
c906108c | 2913 | |
c5aa993b | 2914 | /* We aren't done stepping. |
c906108c | 2915 | |
c5aa993b JM |
2916 | Optimize by setting the stepping range to the line. |
2917 | (We might not be in the original line, but if we entered a | |
2918 | new line in mid-statement, we continue stepping. This makes | |
2919 | things like for(;;) statements work better.) */ | |
c906108c | 2920 | |
c5aa993b JM |
2921 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
2922 | { | |
2923 | /* If this is the last line of the function, don't keep stepping | |
2924 | (it would probably step us out of the function). | |
2925 | This is particularly necessary for a one-line function, | |
2926 | in which after skipping the prologue we better stop even though | |
2927 | we will be in mid-line. */ | |
2928 | stop_step = 1; | |
11cf8741 | 2929 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2930 | stop_stepping (ecs); |
2931 | return; | |
c5aa993b JM |
2932 | } |
2933 | step_range_start = ecs->sal.pc; | |
2934 | step_range_end = ecs->sal.end; | |
2935 | step_frame_address = FRAME_FP (get_current_frame ()); | |
2936 | ecs->current_line = ecs->sal.line; | |
2937 | ecs->current_symtab = ecs->sal.symtab; | |
2938 | ||
2939 | /* In the case where we just stepped out of a function into the middle | |
2940 | of a line of the caller, continue stepping, but step_frame_address | |
2941 | must be modified to current frame */ | |
2942 | { | |
2943 | CORE_ADDR current_frame = FRAME_FP (get_current_frame ()); | |
2944 | if (!(INNER_THAN (current_frame, step_frame_address))) | |
2945 | step_frame_address = current_frame; | |
2946 | } | |
c906108c | 2947 | |
d4f3574e | 2948 | keep_going (ecs); |
cd0fc7c3 | 2949 | |
104c1213 | 2950 | } /* extra brace, to preserve old indentation */ |
104c1213 JM |
2951 | } |
2952 | ||
2953 | /* Are we in the middle of stepping? */ | |
2954 | ||
2955 | static int | |
2956 | currently_stepping (struct execution_control_state *ecs) | |
2957 | { | |
2958 | return ((through_sigtramp_breakpoint == NULL | |
2959 | && !ecs->handling_longjmp | |
2960 | && ((step_range_end && step_resume_breakpoint == NULL) | |
2961 | || trap_expected)) | |
2962 | || ecs->stepping_through_solib_after_catch | |
2963 | || bpstat_should_step ()); | |
2964 | } | |
c906108c | 2965 | |
104c1213 JM |
2966 | static void |
2967 | check_sigtramp2 (struct execution_control_state *ecs) | |
2968 | { | |
2969 | if (trap_expected | |
2970 | && IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
2971 | && !IN_SIGTRAMP (prev_pc, prev_func_name) | |
2972 | && INNER_THAN (read_sp (), step_sp)) | |
2973 | { | |
2974 | /* What has happened here is that we have just stepped the | |
2975 | inferior with a signal (because it is a signal which | |
2976 | shouldn't make us stop), thus stepping into sigtramp. | |
2977 | ||
2978 | So we need to set a step_resume_break_address breakpoint and | |
2979 | continue until we hit it, and then step. FIXME: This should | |
2980 | be more enduring than a step_resume breakpoint; we should | |
2981 | know that we will later need to keep going rather than | |
2982 | re-hitting the breakpoint here (see the testsuite, | |
2983 | gdb.base/signals.exp where it says "exceedingly difficult"). */ | |
2984 | ||
2985 | struct symtab_and_line sr_sal; | |
2986 | ||
2987 | INIT_SAL (&sr_sal); /* initialize to zeroes */ | |
2988 | sr_sal.pc = prev_pc; | |
2989 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2990 | /* We perhaps could set the frame if we kept track of what the | |
2991 | frame corresponding to prev_pc was. But we don't, so don't. */ | |
2992 | through_sigtramp_breakpoint = | |
2993 | set_momentary_breakpoint (sr_sal, NULL, bp_through_sigtramp); | |
2994 | if (breakpoints_inserted) | |
2995 | insert_breakpoints (); | |
cd0fc7c3 | 2996 | |
104c1213 JM |
2997 | ecs->remove_breakpoints_on_following_step = 1; |
2998 | ecs->another_trap = 1; | |
2999 | } | |
3000 | } | |
3001 | ||
c2c6d25f JM |
3002 | /* Subroutine call with source code we should not step over. Do step |
3003 | to the first line of code in it. */ | |
3004 | ||
3005 | static void | |
3006 | step_into_function (struct execution_control_state *ecs) | |
3007 | { | |
3008 | struct symtab *s; | |
3009 | struct symtab_and_line sr_sal; | |
3010 | ||
3011 | s = find_pc_symtab (stop_pc); | |
3012 | if (s && s->language != language_asm) | |
3013 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
3014 | ||
3015 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
3016 | /* Use the step_resume_break to step until the end of the prologue, | |
3017 | even if that involves jumps (as it seems to on the vax under | |
3018 | 4.2). */ | |
3019 | /* If the prologue ends in the middle of a source line, continue to | |
3020 | the end of that source line (if it is still within the function). | |
3021 | Otherwise, just go to end of prologue. */ | |
3022 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP | |
3023 | /* no, don't either. It skips any code that's legitimately on the | |
3024 | first line. */ | |
3025 | #else | |
3026 | if (ecs->sal.end | |
3027 | && ecs->sal.pc != ecs->stop_func_start | |
3028 | && ecs->sal.end < ecs->stop_func_end) | |
3029 | ecs->stop_func_start = ecs->sal.end; | |
3030 | #endif | |
3031 | ||
3032 | if (ecs->stop_func_start == stop_pc) | |
3033 | { | |
3034 | /* We are already there: stop now. */ | |
3035 | stop_step = 1; | |
11cf8741 | 3036 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
3037 | stop_stepping (ecs); |
3038 | return; | |
3039 | } | |
3040 | else | |
3041 | { | |
3042 | /* Put the step-breakpoint there and go until there. */ | |
3043 | INIT_SAL (&sr_sal); /* initialize to zeroes */ | |
3044 | sr_sal.pc = ecs->stop_func_start; | |
3045 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
3046 | /* Do not specify what the fp should be when we stop since on | |
3047 | some machines the prologue is where the new fp value is | |
3048 | established. */ | |
3049 | check_for_old_step_resume_breakpoint (); | |
3050 | step_resume_breakpoint = | |
3051 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
3052 | if (breakpoints_inserted) | |
3053 | insert_breakpoints (); | |
3054 | ||
3055 | /* And make sure stepping stops right away then. */ | |
3056 | step_range_end = step_range_start; | |
3057 | } | |
3058 | keep_going (ecs); | |
3059 | } | |
d4f3574e SS |
3060 | |
3061 | /* We've just entered a callee, and we wish to resume until it returns | |
3062 | to the caller. Setting a step_resume breakpoint on the return | |
3063 | address will catch a return from the callee. | |
3064 | ||
3065 | However, if the callee is recursing, we want to be careful not to | |
3066 | catch returns of those recursive calls, but only of THIS instance | |
3067 | of the call. | |
3068 | ||
3069 | To do this, we set the step_resume bp's frame to our current | |
3070 | caller's frame (step_frame_address, which is set by the "next" or | |
3071 | "until" command, before execution begins). */ | |
3072 | ||
3073 | static void | |
3074 | step_over_function (struct execution_control_state *ecs) | |
3075 | { | |
3076 | struct symtab_and_line sr_sal; | |
3077 | ||
3078 | INIT_SAL (&sr_sal); /* initialize to zeros */ | |
3079 | sr_sal.pc = ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ())); | |
3080 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
3081 | ||
3082 | check_for_old_step_resume_breakpoint (); | |
3083 | step_resume_breakpoint = | |
3084 | set_momentary_breakpoint (sr_sal, get_current_frame (), bp_step_resume); | |
3085 | ||
d41707c8 | 3086 | if (step_frame_address && !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc)) |
d4f3574e SS |
3087 | step_resume_breakpoint->frame = step_frame_address; |
3088 | ||
3089 | if (breakpoints_inserted) | |
3090 | insert_breakpoints (); | |
3091 | } | |
3092 | ||
104c1213 JM |
3093 | static void |
3094 | stop_stepping (struct execution_control_state *ecs) | |
3095 | { | |
c906108c SS |
3096 | if (target_has_execution) |
3097 | { | |
3098 | /* Are we stopping for a vfork event? We only stop when we see | |
3099 | the child's event. However, we may not yet have seen the | |
104c1213 JM |
3100 | parent's event. And, inferior_pid is still set to the |
3101 | parent's pid, until we resume again and follow either the | |
3102 | parent or child. | |
c906108c SS |
3103 | |
3104 | To ensure that we can really touch inferior_pid (aka, the | |
3105 | parent process) -- which calls to functions like read_pc | |
3106 | implicitly do -- wait on the parent if necessary. */ | |
3107 | if ((pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
3108 | && !pending_follow.fork_event.saw_parent_fork) | |
3109 | { | |
3110 | int parent_pid; | |
3111 | ||
3112 | do | |
3113 | { | |
3114 | if (target_wait_hook) | |
cd0fc7c3 | 3115 | parent_pid = target_wait_hook (-1, &(ecs->ws)); |
c906108c | 3116 | else |
cd0fc7c3 | 3117 | parent_pid = target_wait (-1, &(ecs->ws)); |
c906108c SS |
3118 | } |
3119 | while (parent_pid != inferior_pid); | |
3120 | } | |
3121 | ||
c906108c | 3122 | /* Assuming the inferior still exists, set these up for next |
c5aa993b JM |
3123 | time, just like we did above if we didn't break out of the |
3124 | loop. */ | |
c906108c | 3125 | prev_pc = read_pc (); |
cd0fc7c3 SS |
3126 | prev_func_start = ecs->stop_func_start; |
3127 | prev_func_name = ecs->stop_func_name; | |
c906108c | 3128 | } |
104c1213 | 3129 | |
cd0fc7c3 SS |
3130 | /* Let callers know we don't want to wait for the inferior anymore. */ |
3131 | ecs->wait_some_more = 0; | |
3132 | } | |
3133 | ||
d4f3574e SS |
3134 | /* This function handles various cases where we need to continue |
3135 | waiting for the inferior. */ | |
3136 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
3137 | ||
3138 | static void | |
3139 | keep_going (struct execution_control_state *ecs) | |
3140 | { | |
3141 | /* ??rehrauer: ttrace on HP-UX theoretically allows one to debug a | |
3142 | vforked child between its creation and subsequent exit or call to | |
3143 | exec(). However, I had big problems in this rather creaky exec | |
3144 | engine, getting that to work. The fundamental problem is that | |
3145 | I'm trying to debug two processes via an engine that only | |
3146 | understands a single process with possibly multiple threads. | |
3147 | ||
3148 | Hence, this spot is known to have problems when | |
3149 | target_can_follow_vfork_prior_to_exec returns 1. */ | |
3150 | ||
3151 | /* Save the pc before execution, to compare with pc after stop. */ | |
3152 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ | |
3153 | prev_func_start = ecs->stop_func_start; /* Ok, since if DECR_PC_AFTER | |
3154 | BREAK is defined, the | |
3155 | original pc would not have | |
3156 | been at the start of a | |
3157 | function. */ | |
3158 | prev_func_name = ecs->stop_func_name; | |
3159 | ||
3160 | if (ecs->update_step_sp) | |
3161 | step_sp = read_sp (); | |
3162 | ecs->update_step_sp = 0; | |
3163 | ||
3164 | /* If we did not do break;, it means we should keep running the | |
3165 | inferior and not return to debugger. */ | |
3166 | ||
3167 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
3168 | { | |
3169 | /* We took a signal (which we are supposed to pass through to | |
3170 | the inferior, else we'd have done a break above) and we | |
3171 | haven't yet gotten our trap. Simply continue. */ | |
3172 | resume (currently_stepping (ecs), stop_signal); | |
3173 | } | |
3174 | else | |
3175 | { | |
3176 | /* Either the trap was not expected, but we are continuing | |
3177 | anyway (the user asked that this signal be passed to the | |
3178 | child) | |
3179 | -- or -- | |
3180 | The signal was SIGTRAP, e.g. it was our signal, but we | |
3181 | decided we should resume from it. | |
3182 | ||
3183 | We're going to run this baby now! | |
3184 | ||
3185 | Insert breakpoints now, unless we are trying to one-proceed | |
3186 | past a breakpoint. */ | |
3187 | /* If we've just finished a special step resume and we don't | |
3188 | want to hit a breakpoint, pull em out. */ | |
3189 | if (step_resume_breakpoint == NULL | |
3190 | && through_sigtramp_breakpoint == NULL | |
3191 | && ecs->remove_breakpoints_on_following_step) | |
3192 | { | |
3193 | ecs->remove_breakpoints_on_following_step = 0; | |
3194 | remove_breakpoints (); | |
3195 | breakpoints_inserted = 0; | |
3196 | } | |
3197 | else if (!breakpoints_inserted && | |
3198 | (through_sigtramp_breakpoint != NULL || !ecs->another_trap)) | |
3199 | { | |
3200 | breakpoints_failed = insert_breakpoints (); | |
3201 | if (breakpoints_failed) | |
3202 | { | |
3203 | stop_stepping (ecs); | |
3204 | return; | |
3205 | } | |
3206 | breakpoints_inserted = 1; | |
3207 | } | |
3208 | ||
3209 | trap_expected = ecs->another_trap; | |
3210 | ||
3211 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
3212 | specifies that such a signal should be delivered to the | |
3213 | target program). | |
3214 | ||
3215 | Typically, this would occure when a user is debugging a | |
3216 | target monitor on a simulator: the target monitor sets a | |
3217 | breakpoint; the simulator encounters this break-point and | |
3218 | halts the simulation handing control to GDB; GDB, noteing | |
3219 | that the break-point isn't valid, returns control back to the | |
3220 | simulator; the simulator then delivers the hardware | |
3221 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
3222 | ||
3223 | if (stop_signal == TARGET_SIGNAL_TRAP | |
3224 | && !signal_program[stop_signal]) | |
3225 | stop_signal = TARGET_SIGNAL_0; | |
3226 | ||
3227 | #ifdef SHIFT_INST_REGS | |
3228 | /* I'm not sure when this following segment applies. I do know, | |
3229 | now, that we shouldn't rewrite the regs when we were stopped | |
3230 | by a random signal from the inferior process. */ | |
3231 | /* FIXME: Shouldn't this be based on the valid bit of the SXIP? | |
3232 | (this is only used on the 88k). */ | |
3233 | ||
3234 | if (!bpstat_explains_signal (stop_bpstat) | |
3235 | && (stop_signal != TARGET_SIGNAL_CHLD) | |
3236 | && !stopped_by_random_signal) | |
3237 | SHIFT_INST_REGS (); | |
3238 | #endif /* SHIFT_INST_REGS */ | |
3239 | ||
3240 | resume (currently_stepping (ecs), stop_signal); | |
3241 | } | |
3242 | ||
3243 | prepare_to_wait (ecs); | |
3244 | } | |
3245 | ||
104c1213 JM |
3246 | /* This function normally comes after a resume, before |
3247 | handle_inferior_event exits. It takes care of any last bits of | |
3248 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 3249 | |
104c1213 JM |
3250 | static void |
3251 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 3252 | { |
104c1213 JM |
3253 | if (ecs->infwait_state == infwait_normal_state) |
3254 | { | |
3255 | overlay_cache_invalid = 1; | |
3256 | ||
3257 | /* We have to invalidate the registers BEFORE calling | |
3258 | target_wait because they can be loaded from the target while | |
3259 | in target_wait. This makes remote debugging a bit more | |
3260 | efficient for those targets that provide critical registers | |
3261 | as part of their normal status mechanism. */ | |
3262 | ||
3263 | registers_changed (); | |
3264 | ecs->waiton_pid = -1; | |
3265 | ecs->wp = &(ecs->ws); | |
3266 | } | |
3267 | /* This is the old end of the while loop. Let everybody know we | |
3268 | want to wait for the inferior some more and get called again | |
3269 | soon. */ | |
3270 | ecs->wait_some_more = 1; | |
c906108c | 3271 | } |
11cf8741 JM |
3272 | |
3273 | /* Print why the inferior has stopped. We always print something when | |
3274 | the inferior exits, or receives a signal. The rest of the cases are | |
3275 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
3276 | there should be a call to this function from handle_inferior_event() | |
3277 | each time stop_stepping() is called.*/ | |
3278 | static void | |
3279 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
3280 | { | |
3281 | switch (stop_reason) | |
3282 | { | |
3283 | case STOP_UNKNOWN: | |
3284 | /* We don't deal with these cases from handle_inferior_event() | |
3285 | yet. */ | |
3286 | break; | |
3287 | case END_STEPPING_RANGE: | |
3288 | /* We are done with a step/next/si/ni command. */ | |
3289 | /* For now print nothing. */ | |
fb40c209 AC |
3290 | #ifdef UI_OUT |
3291 | /* Print a message only if not in the middle of doing a "step n" | |
3292 | operation for n > 1 */ | |
3293 | if (!step_multi || !stop_step) | |
3294 | if (interpreter_p && strcmp (interpreter_p, "mi") == 0) | |
3295 | ui_out_field_string (uiout, "reason", "end-stepping-range"); | |
3296 | #endif | |
11cf8741 JM |
3297 | break; |
3298 | case BREAKPOINT_HIT: | |
3299 | /* We found a breakpoint. */ | |
3300 | /* For now print nothing. */ | |
3301 | break; | |
3302 | case SIGNAL_EXITED: | |
3303 | /* The inferior was terminated by a signal. */ | |
8b93c638 JM |
3304 | #ifdef UI_OUT |
3305 | annotate_signalled (); | |
fb40c209 AC |
3306 | if (interpreter_p && strcmp (interpreter_p, "mi") == 0) |
3307 | ui_out_field_string (uiout, "reason", "exited-signalled"); | |
8b93c638 JM |
3308 | ui_out_text (uiout, "\nProgram terminated with signal "); |
3309 | annotate_signal_name (); | |
3310 | ui_out_field_string (uiout, "signal-name", target_signal_to_name (stop_info)); | |
3311 | annotate_signal_name_end (); | |
3312 | ui_out_text (uiout, ", "); | |
3313 | annotate_signal_string (); | |
3314 | ui_out_field_string (uiout, "signal-meaning", target_signal_to_string (stop_info)); | |
3315 | annotate_signal_string_end (); | |
3316 | ui_out_text (uiout, ".\n"); | |
3317 | ui_out_text (uiout, "The program no longer exists.\n"); | |
3318 | #else | |
11cf8741 JM |
3319 | annotate_signalled (); |
3320 | printf_filtered ("\nProgram terminated with signal "); | |
3321 | annotate_signal_name (); | |
3322 | printf_filtered ("%s", target_signal_to_name (stop_info)); | |
3323 | annotate_signal_name_end (); | |
3324 | printf_filtered (", "); | |
3325 | annotate_signal_string (); | |
3326 | printf_filtered ("%s", target_signal_to_string (stop_info)); | |
3327 | annotate_signal_string_end (); | |
3328 | printf_filtered (".\n"); | |
3329 | ||
3330 | printf_filtered ("The program no longer exists.\n"); | |
3331 | gdb_flush (gdb_stdout); | |
8b93c638 | 3332 | #endif |
11cf8741 JM |
3333 | break; |
3334 | case EXITED: | |
3335 | /* The inferior program is finished. */ | |
8b93c638 JM |
3336 | #ifdef UI_OUT |
3337 | annotate_exited (stop_info); | |
3338 | if (stop_info) | |
3339 | { | |
fb40c209 AC |
3340 | if (interpreter_p && strcmp (interpreter_p, "mi") == 0) |
3341 | ui_out_field_string (uiout, "reason", "exited"); | |
8b93c638 JM |
3342 | ui_out_text (uiout, "\nProgram exited with code "); |
3343 | ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) stop_info); | |
3344 | ui_out_text (uiout, ".\n"); | |
3345 | } | |
3346 | else | |
3347 | { | |
fb40c209 AC |
3348 | if (interpreter_p && strcmp (interpreter_p, "mi") == 0) |
3349 | ui_out_field_string (uiout, "reason", "exited-normally"); | |
8b93c638 JM |
3350 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
3351 | } | |
3352 | #else | |
11cf8741 JM |
3353 | annotate_exited (stop_info); |
3354 | if (stop_info) | |
3355 | printf_filtered ("\nProgram exited with code 0%o.\n", | |
3356 | (unsigned int) stop_info); | |
3357 | else | |
3358 | printf_filtered ("\nProgram exited normally.\n"); | |
8b93c638 | 3359 | #endif |
11cf8741 JM |
3360 | break; |
3361 | case SIGNAL_RECEIVED: | |
3362 | /* Signal received. The signal table tells us to print about | |
3363 | it. */ | |
8b93c638 JM |
3364 | #ifdef UI_OUT |
3365 | annotate_signal (); | |
3366 | ui_out_text (uiout, "\nProgram received signal "); | |
3367 | annotate_signal_name (); | |
3368 | ui_out_field_string (uiout, "signal-name", target_signal_to_name (stop_info)); | |
3369 | annotate_signal_name_end (); | |
3370 | ui_out_text (uiout, ", "); | |
3371 | annotate_signal_string (); | |
3372 | ui_out_field_string (uiout, "signal-meaning", target_signal_to_string (stop_info)); | |
3373 | annotate_signal_string_end (); | |
3374 | ui_out_text (uiout, ".\n"); | |
3375 | #else | |
11cf8741 JM |
3376 | annotate_signal (); |
3377 | printf_filtered ("\nProgram received signal "); | |
3378 | annotate_signal_name (); | |
3379 | printf_filtered ("%s", target_signal_to_name (stop_info)); | |
3380 | annotate_signal_name_end (); | |
3381 | printf_filtered (", "); | |
3382 | annotate_signal_string (); | |
3383 | printf_filtered ("%s", target_signal_to_string (stop_info)); | |
3384 | annotate_signal_string_end (); | |
3385 | printf_filtered (".\n"); | |
3386 | gdb_flush (gdb_stdout); | |
8b93c638 | 3387 | #endif |
11cf8741 JM |
3388 | break; |
3389 | default: | |
8e65ff28 AC |
3390 | internal_error (__FILE__, __LINE__, |
3391 | "print_stop_reason: unrecognized enum value"); | |
11cf8741 JM |
3392 | break; |
3393 | } | |
3394 | } | |
c906108c | 3395 | \f |
43ff13b4 | 3396 | |
c906108c SS |
3397 | /* Here to return control to GDB when the inferior stops for real. |
3398 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
3399 | ||
3400 | STOP_PRINT_FRAME nonzero means print the executing frame | |
3401 | (pc, function, args, file, line number and line text). | |
3402 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
3403 | attempting to insert breakpoints. */ | |
3404 | ||
3405 | void | |
96baa820 | 3406 | normal_stop (void) |
c906108c | 3407 | { |
c906108c SS |
3408 | /* As with the notification of thread events, we want to delay |
3409 | notifying the user that we've switched thread context until | |
3410 | the inferior actually stops. | |
3411 | ||
3412 | (Note that there's no point in saying anything if the inferior | |
3413 | has exited!) */ | |
c3f6f71d | 3414 | if ((previous_inferior_pid != inferior_pid) |
7a292a7a | 3415 | && target_has_execution) |
c906108c SS |
3416 | { |
3417 | target_terminal_ours_for_output (); | |
c3f6f71d | 3418 | printf_filtered ("[Switching to %s]\n", |
c906108c | 3419 | target_pid_or_tid_to_str (inferior_pid)); |
c3f6f71d | 3420 | previous_inferior_pid = inferior_pid; |
c906108c | 3421 | } |
c906108c SS |
3422 | |
3423 | /* Make sure that the current_frame's pc is correct. This | |
3424 | is a correction for setting up the frame info before doing | |
3425 | DECR_PC_AFTER_BREAK */ | |
3426 | if (target_has_execution && get_current_frame ()) | |
3427 | (get_current_frame ())->pc = read_pc (); | |
3428 | ||
3429 | if (breakpoints_failed) | |
3430 | { | |
3431 | target_terminal_ours_for_output (); | |
010a3cd9 | 3432 | print_sys_errmsg ("While inserting breakpoints", breakpoints_failed); |
c906108c | 3433 | printf_filtered ("Stopped; cannot insert breakpoints.\n\ |
010a3cd9 EZ |
3434 | The same program may be running in another process,\n\ |
3435 | or you may have requested too many hardware breakpoints\n\ | |
3436 | and/or watchpoints.\n"); | |
c906108c SS |
3437 | } |
3438 | ||
3439 | if (target_has_execution && breakpoints_inserted) | |
3440 | { | |
3441 | if (remove_breakpoints ()) | |
3442 | { | |
3443 | target_terminal_ours_for_output (); | |
3444 | printf_filtered ("Cannot remove breakpoints because "); | |
3445 | printf_filtered ("program is no longer writable.\n"); | |
3446 | printf_filtered ("It might be running in another process.\n"); | |
3447 | printf_filtered ("Further execution is probably impossible.\n"); | |
3448 | } | |
3449 | } | |
3450 | breakpoints_inserted = 0; | |
3451 | ||
3452 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3453 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3454 | ||
3455 | breakpoint_auto_delete (stop_bpstat); | |
3456 | ||
3457 | /* If an auto-display called a function and that got a signal, | |
3458 | delete that auto-display to avoid an infinite recursion. */ | |
3459 | ||
3460 | if (stopped_by_random_signal) | |
3461 | disable_current_display (); | |
3462 | ||
3463 | /* Don't print a message if in the middle of doing a "step n" | |
3464 | operation for n > 1 */ | |
3465 | if (step_multi && stop_step) | |
3466 | goto done; | |
3467 | ||
3468 | target_terminal_ours (); | |
3469 | ||
c906108c SS |
3470 | /* Look up the hook_stop and run it if it exists. */ |
3471 | ||
73bc900d | 3472 | if (stop_command && stop_command->hook_pre) |
c906108c | 3473 | { |
73bc900d | 3474 | catch_errors (hook_stop_stub, stop_command->hook_pre, |
c906108c SS |
3475 | "Error while running hook_stop:\n", RETURN_MASK_ALL); |
3476 | } | |
3477 | ||
3478 | if (!target_has_stack) | |
3479 | { | |
3480 | ||
3481 | goto done; | |
3482 | } | |
3483 | ||
3484 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3485 | and current location is based on that. | |
3486 | Don't do this on return from a stack dummy routine, | |
3487 | or if the program has exited. */ | |
3488 | ||
3489 | if (!stop_stack_dummy) | |
3490 | { | |
3491 | select_frame (get_current_frame (), 0); | |
3492 | ||
3493 | /* Print current location without a level number, if | |
c5aa993b JM |
3494 | we have changed functions or hit a breakpoint. |
3495 | Print source line if we have one. | |
3496 | bpstat_print() contains the logic deciding in detail | |
3497 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3498 | |
d082b2bb AC |
3499 | if (stop_print_frame |
3500 | && selected_frame) | |
c906108c SS |
3501 | { |
3502 | int bpstat_ret; | |
3503 | int source_flag; | |
917317f4 | 3504 | int do_frame_printing = 1; |
c906108c SS |
3505 | |
3506 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3507 | switch (bpstat_ret) |
3508 | { | |
3509 | case PRINT_UNKNOWN: | |
3510 | if (stop_step | |
3511 | && step_frame_address == FRAME_FP (get_current_frame ()) | |
3512 | && step_start_function == find_pc_function (stop_pc)) | |
c5394b80 | 3513 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3514 | else |
c5394b80 | 3515 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3516 | break; |
3517 | case PRINT_SRC_AND_LOC: | |
c5394b80 | 3518 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3519 | break; |
3520 | case PRINT_SRC_ONLY: | |
c5394b80 | 3521 | source_flag = SRC_LINE; |
917317f4 JM |
3522 | break; |
3523 | case PRINT_NOTHING: | |
3524 | do_frame_printing = 0; | |
3525 | break; | |
3526 | default: | |
8e65ff28 AC |
3527 | internal_error (__FILE__, __LINE__, |
3528 | "Unknown value."); | |
917317f4 | 3529 | } |
fb40c209 AC |
3530 | #ifdef UI_OUT |
3531 | /* For mi, have the same behavior every time we stop: | |
3532 | print everything but the source line. */ | |
3533 | if (interpreter_p && strcmp (interpreter_p, "mi") == 0) | |
3534 | source_flag = LOC_AND_ADDRESS; | |
3535 | #endif | |
c906108c | 3536 | |
fb40c209 AC |
3537 | #ifdef UI_OUT |
3538 | if (interpreter_p && strcmp (interpreter_p, "mi") == 0) | |
3539 | ui_out_field_int (uiout, "thread-id", pid_to_thread_id (inferior_pid)); | |
3540 | #endif | |
c906108c SS |
3541 | /* The behavior of this routine with respect to the source |
3542 | flag is: | |
c5394b80 JM |
3543 | SRC_LINE: Print only source line |
3544 | LOCATION: Print only location | |
3545 | SRC_AND_LOC: Print location and source line */ | |
917317f4 JM |
3546 | if (do_frame_printing) |
3547 | show_and_print_stack_frame (selected_frame, -1, source_flag); | |
c906108c SS |
3548 | |
3549 | /* Display the auto-display expressions. */ | |
3550 | do_displays (); | |
3551 | } | |
3552 | } | |
3553 | ||
3554 | /* Save the function value return registers, if we care. | |
3555 | We might be about to restore their previous contents. */ | |
3556 | if (proceed_to_finish) | |
3557 | read_register_bytes (0, stop_registers, REGISTER_BYTES); | |
3558 | ||
3559 | if (stop_stack_dummy) | |
3560 | { | |
3561 | /* Pop the empty frame that contains the stack dummy. | |
3562 | POP_FRAME ends with a setting of the current frame, so we | |
c5aa993b | 3563 | can use that next. */ |
c906108c SS |
3564 | POP_FRAME; |
3565 | /* Set stop_pc to what it was before we called the function. | |
c5aa993b JM |
3566 | Can't rely on restore_inferior_status because that only gets |
3567 | called if we don't stop in the called function. */ | |
c906108c SS |
3568 | stop_pc = read_pc (); |
3569 | select_frame (get_current_frame (), 0); | |
3570 | } | |
3571 | ||
3572 | ||
3573 | TUIDO (((TuiOpaqueFuncPtr) tui_vCheckDataValues, selected_frame)); | |
3574 | ||
3575 | done: | |
3576 | annotate_stopped (); | |
3577 | } | |
3578 | ||
3579 | static int | |
96baa820 | 3580 | hook_stop_stub (void *cmd) |
c906108c SS |
3581 | { |
3582 | execute_user_command ((struct cmd_list_element *) cmd, 0); | |
3583 | return (0); | |
3584 | } | |
3585 | \f | |
c5aa993b | 3586 | int |
96baa820 | 3587 | signal_stop_state (int signo) |
c906108c SS |
3588 | { |
3589 | return signal_stop[signo]; | |
3590 | } | |
3591 | ||
c5aa993b | 3592 | int |
96baa820 | 3593 | signal_print_state (int signo) |
c906108c SS |
3594 | { |
3595 | return signal_print[signo]; | |
3596 | } | |
3597 | ||
c5aa993b | 3598 | int |
96baa820 | 3599 | signal_pass_state (int signo) |
c906108c SS |
3600 | { |
3601 | return signal_program[signo]; | |
3602 | } | |
3603 | ||
d4f3574e SS |
3604 | int signal_stop_update (signo, state) |
3605 | int signo; | |
3606 | int state; | |
3607 | { | |
3608 | int ret = signal_stop[signo]; | |
3609 | signal_stop[signo] = state; | |
3610 | return ret; | |
3611 | } | |
3612 | ||
3613 | int signal_print_update (signo, state) | |
3614 | int signo; | |
3615 | int state; | |
3616 | { | |
3617 | int ret = signal_print[signo]; | |
3618 | signal_print[signo] = state; | |
3619 | return ret; | |
3620 | } | |
3621 | ||
3622 | int signal_pass_update (signo, state) | |
3623 | int signo; | |
3624 | int state; | |
3625 | { | |
3626 | int ret = signal_program[signo]; | |
3627 | signal_program[signo] = state; | |
3628 | return ret; | |
3629 | } | |
3630 | ||
c906108c | 3631 | static void |
96baa820 | 3632 | sig_print_header (void) |
c906108c SS |
3633 | { |
3634 | printf_filtered ("\ | |
3635 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3636 | } | |
3637 | ||
3638 | static void | |
96baa820 | 3639 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3640 | { |
3641 | char *name = target_signal_to_name (oursig); | |
3642 | int name_padding = 13 - strlen (name); | |
96baa820 | 3643 | |
c906108c SS |
3644 | if (name_padding <= 0) |
3645 | name_padding = 0; | |
3646 | ||
3647 | printf_filtered ("%s", name); | |
3648 | printf_filtered ("%*.*s ", name_padding, name_padding, | |
3649 | " "); | |
3650 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); | |
3651 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3652 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3653 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3654 | } | |
3655 | ||
3656 | /* Specify how various signals in the inferior should be handled. */ | |
3657 | ||
3658 | static void | |
96baa820 | 3659 | handle_command (char *args, int from_tty) |
c906108c SS |
3660 | { |
3661 | char **argv; | |
3662 | int digits, wordlen; | |
3663 | int sigfirst, signum, siglast; | |
3664 | enum target_signal oursig; | |
3665 | int allsigs; | |
3666 | int nsigs; | |
3667 | unsigned char *sigs; | |
3668 | struct cleanup *old_chain; | |
3669 | ||
3670 | if (args == NULL) | |
3671 | { | |
3672 | error_no_arg ("signal to handle"); | |
3673 | } | |
3674 | ||
3675 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3676 | ||
3677 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3678 | sigs = (unsigned char *) alloca (nsigs); | |
3679 | memset (sigs, 0, nsigs); | |
3680 | ||
3681 | /* Break the command line up into args. */ | |
3682 | ||
3683 | argv = buildargv (args); | |
3684 | if (argv == NULL) | |
3685 | { | |
3686 | nomem (0); | |
3687 | } | |
7a292a7a | 3688 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3689 | |
3690 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3691 | actions. Signal numbers and signal names may be interspersed with | |
3692 | actions, with the actions being performed for all signals cumulatively | |
3693 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3694 | ||
3695 | while (*argv != NULL) | |
3696 | { | |
3697 | wordlen = strlen (*argv); | |
3698 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3699 | {; | |
3700 | } | |
3701 | allsigs = 0; | |
3702 | sigfirst = siglast = -1; | |
3703 | ||
3704 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3705 | { | |
3706 | /* Apply action to all signals except those used by the | |
3707 | debugger. Silently skip those. */ | |
3708 | allsigs = 1; | |
3709 | sigfirst = 0; | |
3710 | siglast = nsigs - 1; | |
3711 | } | |
3712 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3713 | { | |
3714 | SET_SIGS (nsigs, sigs, signal_stop); | |
3715 | SET_SIGS (nsigs, sigs, signal_print); | |
3716 | } | |
3717 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3718 | { | |
3719 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3720 | } | |
3721 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3722 | { | |
3723 | SET_SIGS (nsigs, sigs, signal_print); | |
3724 | } | |
3725 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3726 | { | |
3727 | SET_SIGS (nsigs, sigs, signal_program); | |
3728 | } | |
3729 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3730 | { | |
3731 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3732 | } | |
3733 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3734 | { | |
3735 | SET_SIGS (nsigs, sigs, signal_program); | |
3736 | } | |
3737 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3738 | { | |
3739 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3740 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3741 | } | |
3742 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3743 | { | |
3744 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3745 | } | |
3746 | else if (digits > 0) | |
3747 | { | |
3748 | /* It is numeric. The numeric signal refers to our own | |
3749 | internal signal numbering from target.h, not to host/target | |
3750 | signal number. This is a feature; users really should be | |
3751 | using symbolic names anyway, and the common ones like | |
3752 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3753 | ||
3754 | sigfirst = siglast = (int) | |
3755 | target_signal_from_command (atoi (*argv)); | |
3756 | if ((*argv)[digits] == '-') | |
3757 | { | |
3758 | siglast = (int) | |
3759 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3760 | } | |
3761 | if (sigfirst > siglast) | |
3762 | { | |
3763 | /* Bet he didn't figure we'd think of this case... */ | |
3764 | signum = sigfirst; | |
3765 | sigfirst = siglast; | |
3766 | siglast = signum; | |
3767 | } | |
3768 | } | |
3769 | else | |
3770 | { | |
3771 | oursig = target_signal_from_name (*argv); | |
3772 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3773 | { | |
3774 | sigfirst = siglast = (int) oursig; | |
3775 | } | |
3776 | else | |
3777 | { | |
3778 | /* Not a number and not a recognized flag word => complain. */ | |
3779 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3780 | } | |
3781 | } | |
3782 | ||
3783 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3784 | which signals to apply actions to. */ |
c906108c SS |
3785 | |
3786 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3787 | { | |
3788 | switch ((enum target_signal) signum) | |
3789 | { | |
3790 | case TARGET_SIGNAL_TRAP: | |
3791 | case TARGET_SIGNAL_INT: | |
3792 | if (!allsigs && !sigs[signum]) | |
3793 | { | |
3794 | if (query ("%s is used by the debugger.\n\ | |
3795 | Are you sure you want to change it? ", | |
3796 | target_signal_to_name | |
3797 | ((enum target_signal) signum))) | |
3798 | { | |
3799 | sigs[signum] = 1; | |
3800 | } | |
3801 | else | |
3802 | { | |
3803 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3804 | gdb_flush (gdb_stdout); | |
3805 | } | |
3806 | } | |
3807 | break; | |
3808 | case TARGET_SIGNAL_0: | |
3809 | case TARGET_SIGNAL_DEFAULT: | |
3810 | case TARGET_SIGNAL_UNKNOWN: | |
3811 | /* Make sure that "all" doesn't print these. */ | |
3812 | break; | |
3813 | default: | |
3814 | sigs[signum] = 1; | |
3815 | break; | |
3816 | } | |
3817 | } | |
3818 | ||
3819 | argv++; | |
3820 | } | |
3821 | ||
3822 | target_notice_signals (inferior_pid); | |
3823 | ||
3824 | if (from_tty) | |
3825 | { | |
3826 | /* Show the results. */ | |
3827 | sig_print_header (); | |
3828 | for (signum = 0; signum < nsigs; signum++) | |
3829 | { | |
3830 | if (sigs[signum]) | |
3831 | { | |
3832 | sig_print_info (signum); | |
3833 | } | |
3834 | } | |
3835 | } | |
3836 | ||
3837 | do_cleanups (old_chain); | |
3838 | } | |
3839 | ||
3840 | static void | |
96baa820 | 3841 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3842 | { |
3843 | char **argv; | |
3844 | struct cleanup *old_chain; | |
3845 | ||
3846 | /* Break the command line up into args. */ | |
3847 | ||
3848 | argv = buildargv (args); | |
3849 | if (argv == NULL) | |
3850 | { | |
3851 | nomem (0); | |
3852 | } | |
7a292a7a | 3853 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3854 | if (argv[1] != (char *) NULL) |
3855 | { | |
3856 | char *argBuf; | |
3857 | int bufLen; | |
3858 | ||
3859 | bufLen = strlen (argv[0]) + 20; | |
3860 | argBuf = (char *) xmalloc (bufLen); | |
3861 | if (argBuf) | |
3862 | { | |
3863 | int validFlag = 1; | |
3864 | enum target_signal oursig; | |
3865 | ||
3866 | oursig = target_signal_from_name (argv[0]); | |
3867 | memset (argBuf, 0, bufLen); | |
3868 | if (strcmp (argv[1], "Q") == 0) | |
3869 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3870 | else | |
3871 | { | |
3872 | if (strcmp (argv[1], "s") == 0) | |
3873 | { | |
3874 | if (!signal_stop[oursig]) | |
3875 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3876 | else | |
3877 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3878 | } | |
3879 | else if (strcmp (argv[1], "i") == 0) | |
3880 | { | |
3881 | if (!signal_program[oursig]) | |
3882 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3883 | else | |
3884 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3885 | } | |
3886 | else if (strcmp (argv[1], "r") == 0) | |
3887 | { | |
3888 | if (!signal_print[oursig]) | |
3889 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3890 | else | |
3891 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3892 | } | |
3893 | else | |
3894 | validFlag = 0; | |
3895 | } | |
3896 | if (validFlag) | |
3897 | handle_command (argBuf, from_tty); | |
3898 | else | |
3899 | printf_filtered ("Invalid signal handling flag.\n"); | |
3900 | if (argBuf) | |
b8c9b27d | 3901 | xfree (argBuf); |
c906108c SS |
3902 | } |
3903 | } | |
3904 | do_cleanups (old_chain); | |
3905 | } | |
3906 | ||
3907 | /* Print current contents of the tables set by the handle command. | |
3908 | It is possible we should just be printing signals actually used | |
3909 | by the current target (but for things to work right when switching | |
3910 | targets, all signals should be in the signal tables). */ | |
3911 | ||
3912 | static void | |
96baa820 | 3913 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3914 | { |
3915 | enum target_signal oursig; | |
3916 | sig_print_header (); | |
3917 | ||
3918 | if (signum_exp) | |
3919 | { | |
3920 | /* First see if this is a symbol name. */ | |
3921 | oursig = target_signal_from_name (signum_exp); | |
3922 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3923 | { | |
3924 | /* No, try numeric. */ | |
3925 | oursig = | |
bb518678 | 3926 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3927 | } |
3928 | sig_print_info (oursig); | |
3929 | return; | |
3930 | } | |
3931 | ||
3932 | printf_filtered ("\n"); | |
3933 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3934 | for (oursig = TARGET_SIGNAL_FIRST; | |
3935 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3936 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3937 | { | |
3938 | QUIT; | |
3939 | ||
3940 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
3941 | && oursig != TARGET_SIGNAL_DEFAULT | |
3942 | && oursig != TARGET_SIGNAL_0) | |
3943 | sig_print_info (oursig); | |
3944 | } | |
3945 | ||
3946 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3947 | } | |
3948 | \f | |
7a292a7a SS |
3949 | struct inferior_status |
3950 | { | |
3951 | enum target_signal stop_signal; | |
3952 | CORE_ADDR stop_pc; | |
3953 | bpstat stop_bpstat; | |
3954 | int stop_step; | |
3955 | int stop_stack_dummy; | |
3956 | int stopped_by_random_signal; | |
3957 | int trap_expected; | |
3958 | CORE_ADDR step_range_start; | |
3959 | CORE_ADDR step_range_end; | |
3960 | CORE_ADDR step_frame_address; | |
5fbbeb29 | 3961 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3962 | CORE_ADDR step_resume_break_address; |
3963 | int stop_after_trap; | |
3964 | int stop_soon_quietly; | |
3965 | CORE_ADDR selected_frame_address; | |
3966 | char *stop_registers; | |
3967 | ||
3968 | /* These are here because if call_function_by_hand has written some | |
3969 | registers and then decides to call error(), we better not have changed | |
3970 | any registers. */ | |
3971 | char *registers; | |
3972 | ||
3973 | int selected_level; | |
3974 | int breakpoint_proceeded; | |
3975 | int restore_stack_info; | |
3976 | int proceed_to_finish; | |
3977 | }; | |
3978 | ||
7a292a7a | 3979 | static struct inferior_status * |
96baa820 | 3980 | xmalloc_inferior_status (void) |
7a292a7a SS |
3981 | { |
3982 | struct inferior_status *inf_status; | |
3983 | inf_status = xmalloc (sizeof (struct inferior_status)); | |
3984 | inf_status->stop_registers = xmalloc (REGISTER_BYTES); | |
3985 | inf_status->registers = xmalloc (REGISTER_BYTES); | |
3986 | return inf_status; | |
3987 | } | |
3988 | ||
7a292a7a | 3989 | static void |
96baa820 | 3990 | free_inferior_status (struct inferior_status *inf_status) |
7a292a7a | 3991 | { |
b8c9b27d KB |
3992 | xfree (inf_status->registers); |
3993 | xfree (inf_status->stop_registers); | |
3994 | xfree (inf_status); | |
7a292a7a SS |
3995 | } |
3996 | ||
3997 | void | |
96baa820 JM |
3998 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3999 | LONGEST val) | |
7a292a7a | 4000 | { |
c5aa993b | 4001 | int size = REGISTER_RAW_SIZE (regno); |
7a292a7a SS |
4002 | void *buf = alloca (size); |
4003 | store_signed_integer (buf, size, val); | |
4004 | memcpy (&inf_status->registers[REGISTER_BYTE (regno)], buf, size); | |
4005 | } | |
4006 | ||
c906108c SS |
4007 | /* Save all of the information associated with the inferior<==>gdb |
4008 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
4009 | (defined in inferior.h). */ | |
4010 | ||
7a292a7a | 4011 | struct inferior_status * |
96baa820 | 4012 | save_inferior_status (int restore_stack_info) |
c906108c | 4013 | { |
7a292a7a SS |
4014 | struct inferior_status *inf_status = xmalloc_inferior_status (); |
4015 | ||
c906108c SS |
4016 | inf_status->stop_signal = stop_signal; |
4017 | inf_status->stop_pc = stop_pc; | |
4018 | inf_status->stop_step = stop_step; | |
4019 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
4020 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
4021 | inf_status->trap_expected = trap_expected; | |
4022 | inf_status->step_range_start = step_range_start; | |
4023 | inf_status->step_range_end = step_range_end; | |
4024 | inf_status->step_frame_address = step_frame_address; | |
4025 | inf_status->step_over_calls = step_over_calls; | |
4026 | inf_status->stop_after_trap = stop_after_trap; | |
4027 | inf_status->stop_soon_quietly = stop_soon_quietly; | |
4028 | /* Save original bpstat chain here; replace it with copy of chain. | |
4029 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
4030 | hand them back the original chain when restore_inferior_status is |
4031 | called. */ | |
c906108c SS |
4032 | inf_status->stop_bpstat = stop_bpstat; |
4033 | stop_bpstat = bpstat_copy (stop_bpstat); | |
4034 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
4035 | inf_status->restore_stack_info = restore_stack_info; | |
4036 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 4037 | |
c906108c SS |
4038 | memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES); |
4039 | ||
4040 | read_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
4041 | ||
4042 | record_selected_frame (&(inf_status->selected_frame_address), | |
4043 | &(inf_status->selected_level)); | |
7a292a7a | 4044 | return inf_status; |
c906108c SS |
4045 | } |
4046 | ||
4047 | struct restore_selected_frame_args | |
4048 | { | |
4049 | CORE_ADDR frame_address; | |
4050 | int level; | |
4051 | }; | |
4052 | ||
c906108c | 4053 | static int |
96baa820 | 4054 | restore_selected_frame (void *args) |
c906108c SS |
4055 | { |
4056 | struct restore_selected_frame_args *fr = | |
4057 | (struct restore_selected_frame_args *) args; | |
4058 | struct frame_info *frame; | |
4059 | int level = fr->level; | |
4060 | ||
4061 | frame = find_relative_frame (get_current_frame (), &level); | |
4062 | ||
4063 | /* If inf_status->selected_frame_address is NULL, there was no | |
4064 | previously selected frame. */ | |
4065 | if (frame == NULL || | |
4066 | /* FRAME_FP (frame) != fr->frame_address || */ | |
4067 | /* elz: deleted this check as a quick fix to the problem that | |
c5aa993b JM |
4068 | for function called by hand gdb creates no internal frame |
4069 | structure and the real stack and gdb's idea of stack are | |
4070 | different if nested calls by hands are made. | |
c906108c | 4071 | |
c5aa993b | 4072 | mvs: this worries me. */ |
c906108c SS |
4073 | level != 0) |
4074 | { | |
4075 | warning ("Unable to restore previously selected frame.\n"); | |
4076 | return 0; | |
4077 | } | |
4078 | ||
4079 | select_frame (frame, fr->level); | |
4080 | ||
4081 | return (1); | |
4082 | } | |
4083 | ||
4084 | void | |
96baa820 | 4085 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
4086 | { |
4087 | stop_signal = inf_status->stop_signal; | |
4088 | stop_pc = inf_status->stop_pc; | |
4089 | stop_step = inf_status->stop_step; | |
4090 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
4091 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
4092 | trap_expected = inf_status->trap_expected; | |
4093 | step_range_start = inf_status->step_range_start; | |
4094 | step_range_end = inf_status->step_range_end; | |
4095 | step_frame_address = inf_status->step_frame_address; | |
4096 | step_over_calls = inf_status->step_over_calls; | |
4097 | stop_after_trap = inf_status->stop_after_trap; | |
4098 | stop_soon_quietly = inf_status->stop_soon_quietly; | |
4099 | bpstat_clear (&stop_bpstat); | |
4100 | stop_bpstat = inf_status->stop_bpstat; | |
4101 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
4102 | proceed_to_finish = inf_status->proceed_to_finish; | |
4103 | ||
7a292a7a | 4104 | /* FIXME: Is the restore of stop_registers always needed */ |
c906108c SS |
4105 | memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES); |
4106 | ||
4107 | /* The inferior can be gone if the user types "print exit(0)" | |
4108 | (and perhaps other times). */ | |
4109 | if (target_has_execution) | |
4110 | write_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
4111 | ||
c906108c SS |
4112 | /* FIXME: If we are being called after stopping in a function which |
4113 | is called from gdb, we should not be trying to restore the | |
4114 | selected frame; it just prints a spurious error message (The | |
4115 | message is useful, however, in detecting bugs in gdb (like if gdb | |
4116 | clobbers the stack)). In fact, should we be restoring the | |
4117 | inferior status at all in that case? . */ | |
4118 | ||
4119 | if (target_has_stack && inf_status->restore_stack_info) | |
4120 | { | |
4121 | struct restore_selected_frame_args fr; | |
4122 | fr.level = inf_status->selected_level; | |
4123 | fr.frame_address = inf_status->selected_frame_address; | |
4124 | /* The point of catch_errors is that if the stack is clobbered, | |
c5aa993b JM |
4125 | walking the stack might encounter a garbage pointer and error() |
4126 | trying to dereference it. */ | |
c906108c SS |
4127 | if (catch_errors (restore_selected_frame, &fr, |
4128 | "Unable to restore previously selected frame:\n", | |
4129 | RETURN_MASK_ERROR) == 0) | |
4130 | /* Error in restoring the selected frame. Select the innermost | |
4131 | frame. */ | |
4132 | ||
4133 | ||
4134 | select_frame (get_current_frame (), 0); | |
4135 | ||
4136 | } | |
c906108c | 4137 | |
7a292a7a SS |
4138 | free_inferior_status (inf_status); |
4139 | } | |
c906108c | 4140 | |
74b7792f AC |
4141 | static void |
4142 | do_restore_inferior_status_cleanup (void *sts) | |
4143 | { | |
4144 | restore_inferior_status (sts); | |
4145 | } | |
4146 | ||
4147 | struct cleanup * | |
4148 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
4149 | { | |
4150 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
4151 | } | |
4152 | ||
c906108c | 4153 | void |
96baa820 | 4154 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
4155 | { |
4156 | /* See save_inferior_status for info on stop_bpstat. */ | |
4157 | bpstat_clear (&inf_status->stop_bpstat); | |
4158 | free_inferior_status (inf_status); | |
4159 | } | |
4160 | ||
c5aa993b | 4161 | \f |
7a292a7a | 4162 | static void |
96baa820 | 4163 | build_infrun (void) |
7a292a7a SS |
4164 | { |
4165 | stop_registers = xmalloc (REGISTER_BYTES); | |
4166 | } | |
c906108c | 4167 | |
c906108c | 4168 | void |
96baa820 | 4169 | _initialize_infrun (void) |
c906108c SS |
4170 | { |
4171 | register int i; | |
4172 | register int numsigs; | |
4173 | struct cmd_list_element *c; | |
4174 | ||
7a292a7a SS |
4175 | build_infrun (); |
4176 | ||
0f71a2f6 JM |
4177 | register_gdbarch_swap (&stop_registers, sizeof (stop_registers), NULL); |
4178 | register_gdbarch_swap (NULL, 0, build_infrun); | |
4179 | ||
c906108c SS |
4180 | add_info ("signals", signals_info, |
4181 | "What debugger does when program gets various signals.\n\ | |
4182 | Specify a signal as argument to print info on that signal only."); | |
4183 | add_info_alias ("handle", "signals", 0); | |
4184 | ||
4185 | add_com ("handle", class_run, handle_command, | |
4186 | concat ("Specify how to handle a signal.\n\ | |
4187 | Args are signals and actions to apply to those signals.\n\ | |
4188 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
4189 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
4190 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
4191 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
4192 | used by the debugger, typically SIGTRAP and SIGINT.\n", | |
4193 | "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
4194 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ | |
4195 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
4196 | Print means print a message if this signal happens.\n\ | |
4197 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
4198 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
4199 | Pass and Stop may be combined.", NULL)); | |
4200 | if (xdb_commands) | |
4201 | { | |
4202 | add_com ("lz", class_info, signals_info, | |
4203 | "What debugger does when program gets various signals.\n\ | |
4204 | Specify a signal as argument to print info on that signal only."); | |
4205 | add_com ("z", class_run, xdb_handle_command, | |
4206 | concat ("Specify how to handle a signal.\n\ | |
4207 | Args are signals and actions to apply to those signals.\n\ | |
4208 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
4209 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
4210 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
4211 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
4212 | used by the debugger, typically SIGTRAP and SIGINT.\n", | |
4213 | "Recognized actions include \"s\" (toggles between stop and nostop), \n\ | |
4214 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ | |
4215 | nopass), \"Q\" (noprint)\n\ | |
4216 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
4217 | Print means print a message if this signal happens.\n\ | |
4218 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
4219 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
4220 | Pass and Stop may be combined.", NULL)); | |
4221 | } | |
4222 | ||
4223 | if (!dbx_commands) | |
4224 | stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command, | |
4225 | "There is no `stop' command, but you can set a hook on `stop'.\n\ | |
4226 | This allows you to set a list of commands to be run each time execution\n\ | |
4227 | of the program stops.", &cmdlist); | |
4228 | ||
4229 | numsigs = (int) TARGET_SIGNAL_LAST; | |
4230 | signal_stop = (unsigned char *) | |
4231 | xmalloc (sizeof (signal_stop[0]) * numsigs); | |
4232 | signal_print = (unsigned char *) | |
4233 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
4234 | signal_program = (unsigned char *) | |
4235 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
4236 | for (i = 0; i < numsigs; i++) | |
4237 | { | |
4238 | signal_stop[i] = 1; | |
4239 | signal_print[i] = 1; | |
4240 | signal_program[i] = 1; | |
4241 | } | |
4242 | ||
4243 | /* Signals caused by debugger's own actions | |
4244 | should not be given to the program afterwards. */ | |
4245 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
4246 | signal_program[TARGET_SIGNAL_INT] = 0; | |
4247 | ||
4248 | /* Signals that are not errors should not normally enter the debugger. */ | |
4249 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
4250 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
4251 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
4252 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
4253 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
4254 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
4255 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
4256 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
4257 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
4258 | signal_print[TARGET_SIGNAL_IO] = 0; | |
4259 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
4260 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
4261 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
4262 | signal_print[TARGET_SIGNAL_URG] = 0; | |
4263 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
4264 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
4265 | ||
cd0fc7c3 SS |
4266 | /* These signals are used internally by user-level thread |
4267 | implementations. (See signal(5) on Solaris.) Like the above | |
4268 | signals, a healthy program receives and handles them as part of | |
4269 | its normal operation. */ | |
4270 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
4271 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
4272 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
4273 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
4274 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
4275 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
4276 | ||
c906108c SS |
4277 | #ifdef SOLIB_ADD |
4278 | add_show_from_set | |
4279 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, | |
4280 | (char *) &stop_on_solib_events, | |
4281 | "Set stopping for shared library events.\n\ | |
4282 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
4283 | notifies gdb of shared library events. The most common event of interest\n\ | |
4284 | to the user would be loading/unloading of a new library.\n", | |
4285 | &setlist), | |
4286 | &showlist); | |
4287 | #endif | |
4288 | ||
4289 | c = add_set_enum_cmd ("follow-fork-mode", | |
4290 | class_run, | |
4291 | follow_fork_mode_kind_names, | |
1ed2a135 | 4292 | &follow_fork_mode_string, |
c906108c SS |
4293 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 |
4294 | kernel problem. It's also not terribly useful without a GUI to | |
4295 | help the user drive two debuggers. So for now, I'm disabling | |
4296 | the "both" option. */ | |
c5aa993b JM |
4297 | /* "Set debugger response to a program call of fork \ |
4298 | or vfork.\n\ | |
4299 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
4300 | parent - the original process is debugged after a fork\n\ | |
4301 | child - the new process is debugged after a fork\n\ | |
4302 | both - both the parent and child are debugged after a fork\n\ | |
4303 | ask - the debugger will ask for one of the above choices\n\ | |
4304 | For \"both\", another copy of the debugger will be started to follow\n\ | |
4305 | the new child process. The original debugger will continue to follow\n\ | |
4306 | the original parent process. To distinguish their prompts, the\n\ | |
4307 | debugger copy's prompt will be changed.\n\ | |
4308 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
4309 | By default, the debugger will follow the parent process.", | |
4310 | */ | |
c906108c SS |
4311 | "Set debugger response to a program call of fork \ |
4312 | or vfork.\n\ | |
4313 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
4314 | parent - the original process is debugged after a fork\n\ | |
4315 | child - the new process is debugged after a fork\n\ | |
4316 | ask - the debugger will ask for one of the above choices\n\ | |
4317 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
4318 | By default, the debugger will follow the parent process.", | |
4319 | &setlist); | |
c5aa993b | 4320 | /* c->function.sfunc = ; */ |
c906108c SS |
4321 | add_show_from_set (c, &showlist); |
4322 | ||
c906108c SS |
4323 | c = add_set_enum_cmd ("scheduler-locking", class_run, |
4324 | scheduler_enums, /* array of string names */ | |
1ed2a135 | 4325 | &scheduler_mode, /* current mode */ |
c906108c SS |
4326 | "Set mode for locking scheduler during execution.\n\ |
4327 | off == no locking (threads may preempt at any time)\n\ | |
4328 | on == full locking (no thread except the current thread may run)\n\ | |
4329 | step == scheduler locked during every single-step operation.\n\ | |
4330 | In this mode, no other thread may run during a step command.\n\ | |
4331 | Other threads may run while stepping over a function call ('next').", | |
4332 | &setlist); | |
4333 | ||
4334 | c->function.sfunc = set_schedlock_func; /* traps on target vector */ | |
4335 | add_show_from_set (c, &showlist); | |
5fbbeb29 CF |
4336 | |
4337 | c = add_set_cmd ("step-mode", class_run, | |
4338 | var_boolean, (char*) &step_stop_if_no_debug, | |
4339 | "Set mode of the step operation. When set, doing a step over a\n\ | |
4340 | function without debug line information will stop at the first\n\ | |
4341 | instruction of that function. Otherwise, the function is skipped and\n\ | |
4342 | the step command stops at a different source line.", | |
4343 | &setlist); | |
4344 | add_show_from_set (c, &showlist); | |
c906108c | 4345 | } |