Commit | Line | Data |
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c906108c | 1 | /* Target-struct-independent code to start (run) and stop an inferior process. |
c5394b80 | 2 | Copyright 1986-1989, 1991-2000 Free Software Foundation, Inc. |
c906108c | 3 | |
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
c906108c | 10 | |
c5aa993b JM |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
c906108c | 15 | |
c5aa993b JM |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "gdb_string.h" | |
23 | #include <ctype.h> | |
24 | #include "symtab.h" | |
25 | #include "frame.h" | |
26 | #include "inferior.h" | |
27 | #include "breakpoint.h" | |
03f2053f | 28 | #include "gdb_wait.h" |
c906108c SS |
29 | #include "gdbcore.h" |
30 | #include "gdbcmd.h" | |
31 | #include "target.h" | |
32 | #include "gdbthread.h" | |
33 | #include "annotate.h" | |
34 | #include "symfile.h" /* for overlay functions */ | |
7a292a7a | 35 | #include "top.h" |
c906108c | 36 | #include <signal.h> |
2acceee2 | 37 | #include "inf-loop.h" |
c906108c SS |
38 | |
39 | /* Prototypes for local functions */ | |
40 | ||
96baa820 | 41 | static void signals_info (char *, int); |
c906108c | 42 | |
96baa820 | 43 | static void handle_command (char *, int); |
c906108c | 44 | |
96baa820 | 45 | static void sig_print_info (enum target_signal); |
c906108c | 46 | |
96baa820 | 47 | static void sig_print_header (void); |
c906108c | 48 | |
74b7792f | 49 | static void resume_cleanups (void *); |
c906108c | 50 | |
96baa820 | 51 | static int hook_stop_stub (void *); |
c906108c | 52 | |
96baa820 | 53 | static void delete_breakpoint_current_contents (void *); |
c906108c | 54 | |
96baa820 JM |
55 | static void set_follow_fork_mode_command (char *arg, int from_tty, |
56 | struct cmd_list_element * c); | |
7a292a7a | 57 | |
96baa820 JM |
58 | static struct inferior_status *xmalloc_inferior_status (void); |
59 | ||
60 | static void free_inferior_status (struct inferior_status *); | |
61 | ||
62 | static int restore_selected_frame (void *); | |
63 | ||
64 | static void build_infrun (void); | |
65 | ||
66 | static void follow_inferior_fork (int parent_pid, int child_pid, | |
67 | int has_forked, int has_vforked); | |
68 | ||
69 | static void follow_fork (int parent_pid, int child_pid); | |
70 | ||
71 | static void follow_vfork (int parent_pid, int child_pid); | |
72 | ||
73 | static void set_schedlock_func (char *args, int from_tty, | |
74 | struct cmd_list_element * c); | |
75 | ||
96baa820 JM |
76 | struct execution_control_state; |
77 | ||
78 | static int currently_stepping (struct execution_control_state *ecs); | |
79 | ||
80 | static void xdb_handle_command (char *args, int from_tty); | |
81 | ||
82 | void _initialize_infrun (void); | |
43ff13b4 | 83 | |
c906108c SS |
84 | int inferior_ignoring_startup_exec_events = 0; |
85 | int inferior_ignoring_leading_exec_events = 0; | |
86 | ||
5fbbeb29 CF |
87 | /* When set, stop the 'step' command if we enter a function which has |
88 | no line number information. The normal behavior is that we step | |
89 | over such function. */ | |
90 | int step_stop_if_no_debug = 0; | |
91 | ||
43ff13b4 | 92 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 93 | |
43ff13b4 JM |
94 | int sync_execution = 0; |
95 | ||
c906108c SS |
96 | /* wait_for_inferior and normal_stop use this to notify the user |
97 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
98 | running in. */ |
99 | ||
c3f6f71d | 100 | static int previous_inferior_pid; |
7a292a7a SS |
101 | |
102 | /* This is true for configurations that may follow through execl() and | |
103 | similar functions. At present this is only true for HP-UX native. */ | |
104 | ||
105 | #ifndef MAY_FOLLOW_EXEC | |
106 | #define MAY_FOLLOW_EXEC (0) | |
c906108c SS |
107 | #endif |
108 | ||
7a292a7a SS |
109 | static int may_follow_exec = MAY_FOLLOW_EXEC; |
110 | ||
c906108c SS |
111 | /* resume and wait_for_inferior use this to ensure that when |
112 | stepping over a hit breakpoint in a threaded application | |
113 | only the thread that hit the breakpoint is stepped and the | |
114 | other threads don't continue. This prevents having another | |
115 | thread run past the breakpoint while it is temporarily | |
116 | removed. | |
117 | ||
118 | This is not thread-specific, so it isn't saved as part of | |
119 | the infrun state. | |
120 | ||
121 | Versions of gdb which don't use the "step == this thread steps | |
122 | and others continue" model but instead use the "step == this | |
96baa820 JM |
123 | thread steps and others wait" shouldn't do this. */ |
124 | ||
c906108c SS |
125 | static int thread_step_needed = 0; |
126 | ||
7a292a7a SS |
127 | /* This is true if thread_step_needed should actually be used. At |
128 | present this is only true for HP-UX native. */ | |
129 | ||
130 | #ifndef USE_THREAD_STEP_NEEDED | |
131 | #define USE_THREAD_STEP_NEEDED (0) | |
132 | #endif | |
133 | ||
134 | static int use_thread_step_needed = USE_THREAD_STEP_NEEDED; | |
135 | ||
c906108c SS |
136 | /* GET_LONGJMP_TARGET returns the PC at which longjmp() will resume the |
137 | program. It needs to examine the jmp_buf argument and extract the PC | |
138 | from it. The return value is non-zero on success, zero otherwise. */ | |
139 | ||
140 | #ifndef GET_LONGJMP_TARGET | |
141 | #define GET_LONGJMP_TARGET(PC_ADDR) 0 | |
142 | #endif | |
143 | ||
144 | ||
145 | /* Some machines have trampoline code that sits between function callers | |
146 | and the actual functions themselves. If this machine doesn't have | |
147 | such things, disable their processing. */ | |
148 | ||
149 | #ifndef SKIP_TRAMPOLINE_CODE | |
150 | #define SKIP_TRAMPOLINE_CODE(pc) 0 | |
151 | #endif | |
152 | ||
153 | /* Dynamic function trampolines are similar to solib trampolines in that they | |
154 | are between the caller and the callee. The difference is that when you | |
155 | enter a dynamic trampoline, you can't determine the callee's address. Some | |
156 | (usually complex) code needs to run in the dynamic trampoline to figure out | |
157 | the callee's address. This macro is usually called twice. First, when we | |
158 | enter the trampoline (looks like a normal function call at that point). It | |
159 | should return the PC of a point within the trampoline where the callee's | |
160 | address is known. Second, when we hit the breakpoint, this routine returns | |
161 | the callee's address. At that point, things proceed as per a step resume | |
162 | breakpoint. */ | |
163 | ||
164 | #ifndef DYNAMIC_TRAMPOLINE_NEXTPC | |
165 | #define DYNAMIC_TRAMPOLINE_NEXTPC(pc) 0 | |
166 | #endif | |
167 | ||
d4f3574e SS |
168 | /* If the program uses ELF-style shared libraries, then calls to |
169 | functions in shared libraries go through stubs, which live in a | |
170 | table called the PLT (Procedure Linkage Table). The first time the | |
171 | function is called, the stub sends control to the dynamic linker, | |
172 | which looks up the function's real address, patches the stub so | |
173 | that future calls will go directly to the function, and then passes | |
174 | control to the function. | |
175 | ||
176 | If we are stepping at the source level, we don't want to see any of | |
177 | this --- we just want to skip over the stub and the dynamic linker. | |
178 | The simple approach is to single-step until control leaves the | |
179 | dynamic linker. | |
180 | ||
181 | However, on some systems (e.g., Red Hat Linux 5.2) the dynamic | |
182 | linker calls functions in the shared C library, so you can't tell | |
183 | from the PC alone whether the dynamic linker is still running. In | |
184 | this case, we use a step-resume breakpoint to get us past the | |
185 | dynamic linker, as if we were using "next" to step over a function | |
186 | call. | |
187 | ||
188 | IN_SOLIB_DYNSYM_RESOLVE_CODE says whether we're in the dynamic | |
189 | linker code or not. Normally, this means we single-step. However, | |
190 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
191 | address where we can place a step-resume breakpoint to get past the | |
192 | linker's symbol resolution function. | |
193 | ||
194 | IN_SOLIB_DYNSYM_RESOLVE_CODE can generally be implemented in a | |
195 | pretty portable way, by comparing the PC against the address ranges | |
196 | of the dynamic linker's sections. | |
197 | ||
198 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
199 | it depends on internal details of the dynamic linker. It's usually | |
200 | not too hard to figure out where to put a breakpoint, but it | |
201 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
202 | sanity checking. If it can't figure things out, returning zero and | |
203 | getting the (possibly confusing) stepping behavior is better than | |
204 | signalling an error, which will obscure the change in the | |
205 | inferior's state. */ | |
c906108c SS |
206 | |
207 | #ifndef IN_SOLIB_DYNSYM_RESOLVE_CODE | |
208 | #define IN_SOLIB_DYNSYM_RESOLVE_CODE(pc) 0 | |
209 | #endif | |
210 | ||
d4f3574e SS |
211 | #ifndef SKIP_SOLIB_RESOLVER |
212 | #define SKIP_SOLIB_RESOLVER(pc) 0 | |
213 | #endif | |
214 | ||
c906108c SS |
215 | /* For SVR4 shared libraries, each call goes through a small piece of |
216 | trampoline code in the ".plt" section. IN_SOLIB_CALL_TRAMPOLINE evaluates | |
217 | to nonzero if we are current stopped in one of these. */ | |
218 | ||
219 | #ifndef IN_SOLIB_CALL_TRAMPOLINE | |
220 | #define IN_SOLIB_CALL_TRAMPOLINE(pc,name) 0 | |
221 | #endif | |
222 | ||
223 | /* In some shared library schemes, the return path from a shared library | |
224 | call may need to go through a trampoline too. */ | |
225 | ||
226 | #ifndef IN_SOLIB_RETURN_TRAMPOLINE | |
227 | #define IN_SOLIB_RETURN_TRAMPOLINE(pc,name) 0 | |
228 | #endif | |
229 | ||
230 | /* This function returns TRUE if pc is the address of an instruction | |
231 | that lies within the dynamic linker (such as the event hook, or the | |
232 | dld itself). | |
233 | ||
234 | This function must be used only when a dynamic linker event has | |
235 | been caught, and the inferior is being stepped out of the hook, or | |
236 | undefined results are guaranteed. */ | |
237 | ||
238 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
239 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
240 | #endif | |
241 | ||
242 | /* On MIPS16, a function that returns a floating point value may call | |
243 | a library helper function to copy the return value to a floating point | |
244 | register. The IGNORE_HELPER_CALL macro returns non-zero if we | |
245 | should ignore (i.e. step over) this function call. */ | |
246 | #ifndef IGNORE_HELPER_CALL | |
247 | #define IGNORE_HELPER_CALL(pc) 0 | |
248 | #endif | |
249 | ||
250 | /* On some systems, the PC may be left pointing at an instruction that won't | |
251 | actually be executed. This is usually indicated by a bit in the PSW. If | |
252 | we find ourselves in such a state, then we step the target beyond the | |
253 | nullified instruction before returning control to the user so as to avoid | |
254 | confusion. */ | |
255 | ||
256 | #ifndef INSTRUCTION_NULLIFIED | |
257 | #define INSTRUCTION_NULLIFIED 0 | |
258 | #endif | |
259 | ||
c2c6d25f JM |
260 | /* We can't step off a permanent breakpoint in the ordinary way, because we |
261 | can't remove it. Instead, we have to advance the PC to the next | |
262 | instruction. This macro should expand to a pointer to a function that | |
263 | does that, or zero if we have no such function. If we don't have a | |
264 | definition for it, we have to report an error. */ | |
265 | #ifndef SKIP_PERMANENT_BREAKPOINT | |
266 | #define SKIP_PERMANENT_BREAKPOINT (default_skip_permanent_breakpoint) | |
267 | static void | |
c2d11a7d | 268 | default_skip_permanent_breakpoint (void) |
c2c6d25f JM |
269 | { |
270 | error_begin (); | |
271 | fprintf_filtered (gdb_stderr, "\ | |
272 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
273 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
274 | a command like `return' or `jump' to continue execution.\n"); | |
275 | return_to_top_level (RETURN_ERROR); | |
276 | } | |
277 | #endif | |
278 | ||
279 | ||
7a292a7a SS |
280 | /* Convert the #defines into values. This is temporary until wfi control |
281 | flow is completely sorted out. */ | |
282 | ||
283 | #ifndef HAVE_STEPPABLE_WATCHPOINT | |
284 | #define HAVE_STEPPABLE_WATCHPOINT 0 | |
285 | #else | |
286 | #undef HAVE_STEPPABLE_WATCHPOINT | |
287 | #define HAVE_STEPPABLE_WATCHPOINT 1 | |
288 | #endif | |
289 | ||
290 | #ifndef HAVE_NONSTEPPABLE_WATCHPOINT | |
291 | #define HAVE_NONSTEPPABLE_WATCHPOINT 0 | |
292 | #else | |
293 | #undef HAVE_NONSTEPPABLE_WATCHPOINT | |
294 | #define HAVE_NONSTEPPABLE_WATCHPOINT 1 | |
295 | #endif | |
296 | ||
297 | #ifndef HAVE_CONTINUABLE_WATCHPOINT | |
298 | #define HAVE_CONTINUABLE_WATCHPOINT 0 | |
299 | #else | |
300 | #undef HAVE_CONTINUABLE_WATCHPOINT | |
301 | #define HAVE_CONTINUABLE_WATCHPOINT 1 | |
302 | #endif | |
303 | ||
692590c1 MS |
304 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
305 | #define CANNOT_STEP_HW_WATCHPOINTS 0 | |
306 | #else | |
307 | #undef CANNOT_STEP_HW_WATCHPOINTS | |
308 | #define CANNOT_STEP_HW_WATCHPOINTS 1 | |
309 | #endif | |
310 | ||
c906108c SS |
311 | /* Tables of how to react to signals; the user sets them. */ |
312 | ||
313 | static unsigned char *signal_stop; | |
314 | static unsigned char *signal_print; | |
315 | static unsigned char *signal_program; | |
316 | ||
317 | #define SET_SIGS(nsigs,sigs,flags) \ | |
318 | do { \ | |
319 | int signum = (nsigs); \ | |
320 | while (signum-- > 0) \ | |
321 | if ((sigs)[signum]) \ | |
322 | (flags)[signum] = 1; \ | |
323 | } while (0) | |
324 | ||
325 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
326 | do { \ | |
327 | int signum = (nsigs); \ | |
328 | while (signum-- > 0) \ | |
329 | if ((sigs)[signum]) \ | |
330 | (flags)[signum] = 0; \ | |
331 | } while (0) | |
332 | ||
333 | ||
334 | /* Command list pointer for the "stop" placeholder. */ | |
335 | ||
336 | static struct cmd_list_element *stop_command; | |
337 | ||
338 | /* Nonzero if breakpoints are now inserted in the inferior. */ | |
339 | ||
340 | static int breakpoints_inserted; | |
341 | ||
342 | /* Function inferior was in as of last step command. */ | |
343 | ||
344 | static struct symbol *step_start_function; | |
345 | ||
346 | /* Nonzero if we are expecting a trace trap and should proceed from it. */ | |
347 | ||
348 | static int trap_expected; | |
349 | ||
350 | #ifdef SOLIB_ADD | |
351 | /* Nonzero if we want to give control to the user when we're notified | |
352 | of shared library events by the dynamic linker. */ | |
353 | static int stop_on_solib_events; | |
354 | #endif | |
355 | ||
356 | #ifdef HP_OS_BUG | |
357 | /* Nonzero if the next time we try to continue the inferior, it will | |
358 | step one instruction and generate a spurious trace trap. | |
359 | This is used to compensate for a bug in HP-UX. */ | |
360 | ||
361 | static int trap_expected_after_continue; | |
362 | #endif | |
363 | ||
364 | /* Nonzero means expecting a trace trap | |
365 | and should stop the inferior and return silently when it happens. */ | |
366 | ||
367 | int stop_after_trap; | |
368 | ||
369 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
370 | It is used after attach, due to attaching to a process; | |
371 | when running in the shell before the child program has been exec'd; | |
372 | and when running some kinds of remote stuff (FIXME?). */ | |
373 | ||
374 | int stop_soon_quietly; | |
375 | ||
376 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
377 | situation when stop_registers should be saved. */ | |
378 | ||
379 | int proceed_to_finish; | |
380 | ||
381 | /* Save register contents here when about to pop a stack dummy frame, | |
382 | if-and-only-if proceed_to_finish is set. | |
383 | Thus this contains the return value from the called function (assuming | |
384 | values are returned in a register). */ | |
385 | ||
7a292a7a | 386 | char *stop_registers; |
c906108c SS |
387 | |
388 | /* Nonzero if program stopped due to error trying to insert breakpoints. */ | |
389 | ||
390 | static int breakpoints_failed; | |
391 | ||
392 | /* Nonzero after stop if current stack frame should be printed. */ | |
393 | ||
394 | static int stop_print_frame; | |
395 | ||
396 | static struct breakpoint *step_resume_breakpoint = NULL; | |
397 | static struct breakpoint *through_sigtramp_breakpoint = NULL; | |
398 | ||
399 | /* On some platforms (e.g., HP-UX), hardware watchpoints have bad | |
400 | interactions with an inferior that is running a kernel function | |
401 | (aka, a system call or "syscall"). wait_for_inferior therefore | |
402 | may have a need to know when the inferior is in a syscall. This | |
403 | is a count of the number of inferior threads which are known to | |
404 | currently be running in a syscall. */ | |
405 | static int number_of_threads_in_syscalls; | |
406 | ||
407 | /* This is used to remember when a fork, vfork or exec event | |
408 | was caught by a catchpoint, and thus the event is to be | |
409 | followed at the next resume of the inferior, and not | |
410 | immediately. */ | |
411 | static struct | |
412 | { | |
413 | enum target_waitkind kind; | |
414 | struct | |
415 | { | |
416 | int parent_pid; | |
417 | int saw_parent_fork; | |
418 | int child_pid; | |
419 | int saw_child_fork; | |
420 | int saw_child_exec; | |
421 | } | |
422 | fork_event; | |
423 | char *execd_pathname; | |
424 | } | |
425 | pending_follow; | |
426 | ||
427 | /* Some platforms don't allow us to do anything meaningful with a | |
428 | vforked child until it has exec'd. Vforked processes on such | |
429 | platforms can only be followed after they've exec'd. | |
430 | ||
431 | When this is set to 0, a vfork can be immediately followed, | |
432 | and an exec can be followed merely as an exec. When this is | |
433 | set to 1, a vfork event has been seen, but cannot be followed | |
434 | until the exec is seen. | |
435 | ||
436 | (In the latter case, inferior_pid is still the parent of the | |
437 | vfork, and pending_follow.fork_event.child_pid is the child. The | |
438 | appropriate process is followed, according to the setting of | |
439 | follow-fork-mode.) */ | |
440 | static int follow_vfork_when_exec; | |
441 | ||
53904c9e AC |
442 | static const char follow_fork_mode_ask[] = "ask"; |
443 | static const char follow_fork_mode_both[] = "both"; | |
444 | static const char follow_fork_mode_child[] = "child"; | |
445 | static const char follow_fork_mode_parent[] = "parent"; | |
446 | ||
447 | static const char *follow_fork_mode_kind_names[] = | |
c906108c | 448 | { |
53904c9e | 449 | follow_fork_mode_ask, |
ef346e04 AC |
450 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 |
451 | kernel problem. It's also not terribly useful without a GUI to | |
452 | help the user drive two debuggers. So for now, I'm disabling the | |
453 | "both" option. */ | |
53904c9e AC |
454 | /* follow_fork_mode_both, */ |
455 | follow_fork_mode_child, | |
456 | follow_fork_mode_parent, | |
457 | NULL | |
ef346e04 | 458 | }; |
c906108c | 459 | |
53904c9e | 460 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
c906108c SS |
461 | \f |
462 | ||
c906108c | 463 | static void |
96baa820 JM |
464 | follow_inferior_fork (int parent_pid, int child_pid, int has_forked, |
465 | int has_vforked) | |
c906108c SS |
466 | { |
467 | int followed_parent = 0; | |
468 | int followed_child = 0; | |
c906108c SS |
469 | |
470 | /* Which process did the user want us to follow? */ | |
53904c9e | 471 | const char *follow_mode = follow_fork_mode_string; |
c906108c SS |
472 | |
473 | /* Or, did the user not know, and want us to ask? */ | |
e28d556f | 474 | if (follow_fork_mode_string == follow_fork_mode_ask) |
c906108c | 475 | { |
53904c9e AC |
476 | internal_error ("follow_inferior_fork: \"ask\" mode not implemented"); |
477 | /* follow_mode = follow_fork_mode_...; */ | |
c906108c SS |
478 | } |
479 | ||
480 | /* If we're to be following the parent, then detach from child_pid. | |
481 | We're already following the parent, so need do nothing explicit | |
482 | for it. */ | |
53904c9e | 483 | if (follow_mode == follow_fork_mode_parent) |
c906108c SS |
484 | { |
485 | followed_parent = 1; | |
486 | ||
487 | /* We're already attached to the parent, by default. */ | |
488 | ||
489 | /* Before detaching from the child, remove all breakpoints from | |
490 | it. (This won't actually modify the breakpoint list, but will | |
491 | physically remove the breakpoints from the child.) */ | |
492 | if (!has_vforked || !follow_vfork_when_exec) | |
493 | { | |
494 | detach_breakpoints (child_pid); | |
7a292a7a | 495 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
c906108c | 496 | SOLIB_REMOVE_INFERIOR_HOOK (child_pid); |
7a292a7a | 497 | #endif |
c906108c SS |
498 | } |
499 | ||
500 | /* Detach from the child. */ | |
501 | dont_repeat (); | |
502 | ||
503 | target_require_detach (child_pid, "", 1); | |
504 | } | |
505 | ||
506 | /* If we're to be following the child, then attach to it, detach | |
507 | from inferior_pid, and set inferior_pid to child_pid. */ | |
53904c9e | 508 | else if (follow_mode == follow_fork_mode_child) |
c906108c SS |
509 | { |
510 | char child_pid_spelling[100]; /* Arbitrary length. */ | |
511 | ||
512 | followed_child = 1; | |
513 | ||
514 | /* Before detaching from the parent, detach all breakpoints from | |
515 | the child. But only if we're forking, or if we follow vforks | |
516 | as soon as they happen. (If we're following vforks only when | |
517 | the child has exec'd, then it's very wrong to try to write | |
518 | back the "shadow contents" of inserted breakpoints now -- they | |
519 | belong to the child's pre-exec'd a.out.) */ | |
520 | if (!has_vforked || !follow_vfork_when_exec) | |
521 | { | |
522 | detach_breakpoints (child_pid); | |
523 | } | |
524 | ||
525 | /* Before detaching from the parent, remove all breakpoints from it. */ | |
526 | remove_breakpoints (); | |
527 | ||
528 | /* Also reset the solib inferior hook from the parent. */ | |
7a292a7a | 529 | #ifdef SOLIB_REMOVE_INFERIOR_HOOK |
c906108c | 530 | SOLIB_REMOVE_INFERIOR_HOOK (inferior_pid); |
7a292a7a | 531 | #endif |
c906108c SS |
532 | |
533 | /* Detach from the parent. */ | |
534 | dont_repeat (); | |
535 | target_detach (NULL, 1); | |
536 | ||
537 | /* Attach to the child. */ | |
538 | inferior_pid = child_pid; | |
539 | sprintf (child_pid_spelling, "%d", child_pid); | |
540 | dont_repeat (); | |
541 | ||
542 | target_require_attach (child_pid_spelling, 1); | |
543 | ||
544 | /* Was there a step_resume breakpoint? (There was if the user | |
545 | did a "next" at the fork() call.) If so, explicitly reset its | |
546 | thread number. | |
547 | ||
548 | step_resumes are a form of bp that are made to be per-thread. | |
549 | Since we created the step_resume bp when the parent process | |
550 | was being debugged, and now are switching to the child process, | |
551 | from the breakpoint package's viewpoint, that's a switch of | |
552 | "threads". We must update the bp's notion of which thread | |
553 | it is for, or it'll be ignored when it triggers... */ | |
554 | if (step_resume_breakpoint && | |
555 | (!has_vforked || !follow_vfork_when_exec)) | |
556 | breakpoint_re_set_thread (step_resume_breakpoint); | |
557 | ||
558 | /* Reinsert all breakpoints in the child. (The user may've set | |
559 | breakpoints after catching the fork, in which case those | |
560 | actually didn't get set in the child, but only in the parent.) */ | |
561 | if (!has_vforked || !follow_vfork_when_exec) | |
562 | { | |
563 | breakpoint_re_set (); | |
564 | insert_breakpoints (); | |
565 | } | |
566 | } | |
567 | ||
568 | /* If we're to be following both parent and child, then fork ourselves, | |
569 | and attach the debugger clone to the child. */ | |
53904c9e | 570 | else if (follow_mode == follow_fork_mode_both) |
c906108c SS |
571 | { |
572 | char pid_suffix[100]; /* Arbitrary length. */ | |
573 | ||
574 | /* Clone ourselves to follow the child. This is the end of our | |
c5aa993b | 575 | involvement with child_pid; our clone will take it from here... */ |
c906108c SS |
576 | dont_repeat (); |
577 | target_clone_and_follow_inferior (child_pid, &followed_child); | |
578 | followed_parent = !followed_child; | |
579 | ||
580 | /* We continue to follow the parent. To help distinguish the two | |
581 | debuggers, though, both we and our clone will reset our prompts. */ | |
582 | sprintf (pid_suffix, "[%d] ", inferior_pid); | |
583 | set_prompt (strcat (get_prompt (), pid_suffix)); | |
584 | } | |
585 | ||
586 | /* The parent and child of a vfork share the same address space. | |
587 | Also, on some targets the order in which vfork and exec events | |
588 | are received for parent in child requires some delicate handling | |
589 | of the events. | |
590 | ||
591 | For instance, on ptrace-based HPUX we receive the child's vfork | |
592 | event first, at which time the parent has been suspended by the | |
593 | OS and is essentially untouchable until the child's exit or second | |
594 | exec event arrives. At that time, the parent's vfork event is | |
595 | delivered to us, and that's when we see and decide how to follow | |
596 | the vfork. But to get to that point, we must continue the child | |
597 | until it execs or exits. To do that smoothly, all breakpoints | |
598 | must be removed from the child, in case there are any set between | |
599 | the vfork() and exec() calls. But removing them from the child | |
600 | also removes them from the parent, due to the shared-address-space | |
601 | nature of a vfork'd parent and child. On HPUX, therefore, we must | |
602 | take care to restore the bp's to the parent before we continue it. | |
603 | Else, it's likely that we may not stop in the expected place. (The | |
604 | worst scenario is when the user tries to step over a vfork() call; | |
605 | the step-resume bp must be restored for the step to properly stop | |
606 | in the parent after the call completes!) | |
607 | ||
608 | Sequence of events, as reported to gdb from HPUX: | |
609 | ||
c5aa993b JM |
610 | Parent Child Action for gdb to take |
611 | ------------------------------------------------------- | |
612 | 1 VFORK Continue child | |
613 | 2 EXEC | |
614 | 3 EXEC or EXIT | |
615 | 4 VFORK */ | |
c906108c SS |
616 | if (has_vforked) |
617 | { | |
618 | target_post_follow_vfork (parent_pid, | |
619 | followed_parent, | |
620 | child_pid, | |
621 | followed_child); | |
622 | } | |
623 | ||
624 | pending_follow.fork_event.saw_parent_fork = 0; | |
625 | pending_follow.fork_event.saw_child_fork = 0; | |
c906108c SS |
626 | } |
627 | ||
628 | static void | |
96baa820 | 629 | follow_fork (int parent_pid, int child_pid) |
c906108c SS |
630 | { |
631 | follow_inferior_fork (parent_pid, child_pid, 1, 0); | |
632 | } | |
633 | ||
634 | ||
635 | /* Forward declaration. */ | |
96baa820 | 636 | static void follow_exec (int, char *); |
c906108c SS |
637 | |
638 | static void | |
96baa820 | 639 | follow_vfork (int parent_pid, int child_pid) |
c906108c SS |
640 | { |
641 | follow_inferior_fork (parent_pid, child_pid, 0, 1); | |
642 | ||
643 | /* Did we follow the child? Had it exec'd before we saw the parent vfork? */ | |
644 | if (pending_follow.fork_event.saw_child_exec && (inferior_pid == child_pid)) | |
645 | { | |
646 | pending_follow.fork_event.saw_child_exec = 0; | |
647 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
648 | follow_exec (inferior_pid, pending_follow.execd_pathname); | |
649 | free (pending_follow.execd_pathname); | |
650 | } | |
651 | } | |
c906108c SS |
652 | |
653 | static void | |
96baa820 | 654 | follow_exec (int pid, char *execd_pathname) |
c906108c | 655 | { |
c906108c | 656 | int saved_pid = pid; |
7a292a7a SS |
657 | struct target_ops *tgt; |
658 | ||
659 | if (!may_follow_exec) | |
660 | return; | |
c906108c SS |
661 | |
662 | /* Did this exec() follow a vfork()? If so, we must follow the | |
663 | vfork now too. Do it before following the exec. */ | |
664 | if (follow_vfork_when_exec && | |
665 | (pending_follow.kind == TARGET_WAITKIND_VFORKED)) | |
666 | { | |
667 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
668 | follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); | |
669 | follow_vfork_when_exec = 0; | |
670 | saved_pid = inferior_pid; | |
671 | ||
672 | /* Did we follow the parent? If so, we're done. If we followed | |
673 | the child then we must also follow its exec(). */ | |
674 | if (inferior_pid == pending_follow.fork_event.parent_pid) | |
675 | return; | |
676 | } | |
677 | ||
678 | /* This is an exec event that we actually wish to pay attention to. | |
679 | Refresh our symbol table to the newly exec'd program, remove any | |
680 | momentary bp's, etc. | |
681 | ||
682 | If there are breakpoints, they aren't really inserted now, | |
683 | since the exec() transformed our inferior into a fresh set | |
684 | of instructions. | |
685 | ||
686 | We want to preserve symbolic breakpoints on the list, since | |
687 | we have hopes that they can be reset after the new a.out's | |
688 | symbol table is read. | |
689 | ||
690 | However, any "raw" breakpoints must be removed from the list | |
691 | (e.g., the solib bp's), since their address is probably invalid | |
692 | now. | |
693 | ||
694 | And, we DON'T want to call delete_breakpoints() here, since | |
695 | that may write the bp's "shadow contents" (the instruction | |
696 | value that was overwritten witha TRAP instruction). Since | |
697 | we now have a new a.out, those shadow contents aren't valid. */ | |
698 | update_breakpoints_after_exec (); | |
699 | ||
700 | /* If there was one, it's gone now. We cannot truly step-to-next | |
701 | statement through an exec(). */ | |
702 | step_resume_breakpoint = NULL; | |
703 | step_range_start = 0; | |
704 | step_range_end = 0; | |
705 | ||
706 | /* If there was one, it's gone now. */ | |
707 | through_sigtramp_breakpoint = NULL; | |
708 | ||
709 | /* What is this a.out's name? */ | |
710 | printf_unfiltered ("Executing new program: %s\n", execd_pathname); | |
711 | ||
712 | /* We've followed the inferior through an exec. Therefore, the | |
713 | inferior has essentially been killed & reborn. */ | |
7a292a7a SS |
714 | |
715 | /* First collect the run target in effect. */ | |
716 | tgt = find_run_target (); | |
717 | /* If we can't find one, things are in a very strange state... */ | |
718 | if (tgt == NULL) | |
719 | error ("Could find run target to save before following exec"); | |
720 | ||
c906108c SS |
721 | gdb_flush (gdb_stdout); |
722 | target_mourn_inferior (); | |
c5aa993b | 723 | inferior_pid = saved_pid; /* Because mourn_inferior resets inferior_pid. */ |
7a292a7a | 724 | push_target (tgt); |
c906108c SS |
725 | |
726 | /* That a.out is now the one to use. */ | |
727 | exec_file_attach (execd_pathname, 0); | |
728 | ||
729 | /* And also is where symbols can be found. */ | |
730 | symbol_file_command (execd_pathname, 0); | |
731 | ||
732 | /* Reset the shared library package. This ensures that we get | |
733 | a shlib event when the child reaches "_start", at which point | |
734 | the dld will have had a chance to initialize the child. */ | |
7a292a7a | 735 | #if defined(SOLIB_RESTART) |
c906108c | 736 | SOLIB_RESTART (); |
7a292a7a SS |
737 | #endif |
738 | #ifdef SOLIB_CREATE_INFERIOR_HOOK | |
c906108c | 739 | SOLIB_CREATE_INFERIOR_HOOK (inferior_pid); |
7a292a7a | 740 | #endif |
c906108c SS |
741 | |
742 | /* Reinsert all breakpoints. (Those which were symbolic have | |
743 | been reset to the proper address in the new a.out, thanks | |
744 | to symbol_file_command...) */ | |
745 | insert_breakpoints (); | |
746 | ||
747 | /* The next resume of this inferior should bring it to the shlib | |
748 | startup breakpoints. (If the user had also set bp's on | |
749 | "main" from the old (parent) process, then they'll auto- | |
750 | matically get reset there in the new process.) */ | |
c906108c SS |
751 | } |
752 | ||
753 | /* Non-zero if we just simulating a single-step. This is needed | |
754 | because we cannot remove the breakpoints in the inferior process | |
755 | until after the `wait' in `wait_for_inferior'. */ | |
756 | static int singlestep_breakpoints_inserted_p = 0; | |
757 | \f | |
758 | ||
759 | /* Things to clean up if we QUIT out of resume (). */ | |
760 | /* ARGSUSED */ | |
761 | static void | |
74b7792f | 762 | resume_cleanups (void *ignore) |
c906108c SS |
763 | { |
764 | normal_stop (); | |
765 | } | |
766 | ||
53904c9e AC |
767 | static const char schedlock_off[] = "off"; |
768 | static const char schedlock_on[] = "on"; | |
769 | static const char schedlock_step[] = "step"; | |
770 | static const char *scheduler_mode = schedlock_off; | |
771 | static const char *scheduler_enums[] = | |
ef346e04 AC |
772 | { |
773 | schedlock_off, | |
774 | schedlock_on, | |
775 | schedlock_step, | |
776 | NULL | |
777 | }; | |
c906108c SS |
778 | |
779 | static void | |
96baa820 | 780 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c SS |
781 | { |
782 | if (c->type == set_cmd) | |
783 | if (!target_can_lock_scheduler) | |
784 | { | |
785 | scheduler_mode = schedlock_off; | |
786 | error ("Target '%s' cannot support this command.", | |
787 | target_shortname); | |
788 | } | |
789 | } | |
790 | ||
791 | ||
c2c6d25f JM |
792 | |
793 | ||
c906108c SS |
794 | /* Resume the inferior, but allow a QUIT. This is useful if the user |
795 | wants to interrupt some lengthy single-stepping operation | |
796 | (for child processes, the SIGINT goes to the inferior, and so | |
797 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
798 | other targets, that's not true). | |
799 | ||
800 | STEP nonzero if we should step (zero to continue instead). | |
801 | SIG is the signal to give the inferior (zero for none). */ | |
802 | void | |
96baa820 | 803 | resume (int step, enum target_signal sig) |
c906108c SS |
804 | { |
805 | int should_resume = 1; | |
74b7792f | 806 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
c906108c SS |
807 | QUIT; |
808 | ||
809 | #ifdef CANNOT_STEP_BREAKPOINT | |
810 | /* Most targets can step a breakpoint instruction, thus executing it | |
811 | normally. But if this one cannot, just continue and we will hit | |
812 | it anyway. */ | |
813 | if (step && breakpoints_inserted && breakpoint_here_p (read_pc ())) | |
814 | step = 0; | |
815 | #endif | |
816 | ||
692590c1 MS |
817 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
818 | over an instruction that causes a page fault without triggering | |
819 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
820 | stop, because the hardware watchpoint is not triggered, but it forgets | |
821 | the step request and continues the program normally. | |
822 | Work around the problem by removing hardware watchpoints if a step is | |
823 | requested, GDB will check for a hardware watchpoint trigger after the | |
824 | step anyway. */ | |
825 | if (CANNOT_STEP_HW_WATCHPOINTS && step && breakpoints_inserted) | |
826 | remove_hw_watchpoints (); | |
827 | ||
828 | ||
c2c6d25f JM |
829 | /* Normally, by the time we reach `resume', the breakpoints are either |
830 | removed or inserted, as appropriate. The exception is if we're sitting | |
831 | at a permanent breakpoint; we need to step over it, but permanent | |
832 | breakpoints can't be removed. So we have to test for it here. */ | |
833 | if (breakpoint_here_p (read_pc ()) == permanent_breakpoint_here) | |
834 | SKIP_PERMANENT_BREAKPOINT (); | |
835 | ||
c906108c SS |
836 | if (SOFTWARE_SINGLE_STEP_P && step) |
837 | { | |
838 | /* Do it the hard way, w/temp breakpoints */ | |
c5aa993b | 839 | SOFTWARE_SINGLE_STEP (sig, 1 /*insert-breakpoints */ ); |
c906108c SS |
840 | /* ...and don't ask hardware to do it. */ |
841 | step = 0; | |
842 | /* and do not pull these breakpoints until after a `wait' in | |
843 | `wait_for_inferior' */ | |
844 | singlestep_breakpoints_inserted_p = 1; | |
845 | } | |
846 | ||
847 | /* Handle any optimized stores to the inferior NOW... */ | |
848 | #ifdef DO_DEFERRED_STORES | |
849 | DO_DEFERRED_STORES; | |
850 | #endif | |
851 | ||
c906108c SS |
852 | /* If there were any forks/vforks/execs that were caught and are |
853 | now to be followed, then do so. */ | |
854 | switch (pending_follow.kind) | |
855 | { | |
856 | case (TARGET_WAITKIND_FORKED): | |
857 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
858 | follow_fork (inferior_pid, pending_follow.fork_event.child_pid); | |
859 | break; | |
860 | ||
861 | case (TARGET_WAITKIND_VFORKED): | |
862 | { | |
863 | int saw_child_exec = pending_follow.fork_event.saw_child_exec; | |
864 | ||
865 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; | |
866 | follow_vfork (inferior_pid, pending_follow.fork_event.child_pid); | |
867 | ||
868 | /* Did we follow the child, but not yet see the child's exec event? | |
c5aa993b JM |
869 | If so, then it actually ought to be waiting for us; we respond to |
870 | parent vfork events. We don't actually want to resume the child | |
871 | in this situation; we want to just get its exec event. */ | |
c906108c SS |
872 | if (!saw_child_exec && |
873 | (inferior_pid == pending_follow.fork_event.child_pid)) | |
874 | should_resume = 0; | |
875 | } | |
876 | break; | |
877 | ||
878 | case (TARGET_WAITKIND_EXECD): | |
879 | /* If we saw a vfork event but couldn't follow it until we saw | |
c5aa993b | 880 | an exec, then now might be the time! */ |
c906108c SS |
881 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
882 | /* follow_exec is called as soon as the exec event is seen. */ | |
883 | break; | |
884 | ||
885 | default: | |
886 | break; | |
887 | } | |
c906108c SS |
888 | |
889 | /* Install inferior's terminal modes. */ | |
890 | target_terminal_inferior (); | |
891 | ||
892 | if (should_resume) | |
893 | { | |
dfcd3bfb JM |
894 | int resume_pid; |
895 | ||
7a292a7a | 896 | if (use_thread_step_needed && thread_step_needed) |
c906108c SS |
897 | { |
898 | /* We stopped on a BPT instruction; | |
899 | don't continue other threads and | |
900 | just step this thread. */ | |
901 | thread_step_needed = 0; | |
902 | ||
903 | if (!breakpoint_here_p (read_pc ())) | |
904 | { | |
905 | /* Breakpoint deleted: ok to do regular resume | |
c5aa993b | 906 | where all the threads either step or continue. */ |
dfcd3bfb | 907 | resume_pid = -1; |
c906108c SS |
908 | } |
909 | else | |
910 | { | |
911 | if (!step) | |
912 | { | |
913 | warning ("Internal error, changing continue to step."); | |
914 | remove_breakpoints (); | |
915 | breakpoints_inserted = 0; | |
916 | trap_expected = 1; | |
917 | step = 1; | |
918 | } | |
dfcd3bfb | 919 | resume_pid = inferior_pid; |
c906108c SS |
920 | } |
921 | } | |
922 | else | |
c906108c SS |
923 | { |
924 | /* Vanilla resume. */ | |
c906108c SS |
925 | if ((scheduler_mode == schedlock_on) || |
926 | (scheduler_mode == schedlock_step && step != 0)) | |
dfcd3bfb | 927 | resume_pid = inferior_pid; |
c906108c | 928 | else |
dfcd3bfb | 929 | resume_pid = -1; |
c906108c | 930 | } |
dfcd3bfb | 931 | target_resume (resume_pid, step, sig); |
c906108c SS |
932 | } |
933 | ||
934 | discard_cleanups (old_cleanups); | |
935 | } | |
936 | \f | |
937 | ||
938 | /* Clear out all variables saying what to do when inferior is continued. | |
939 | First do this, then set the ones you want, then call `proceed'. */ | |
940 | ||
941 | void | |
96baa820 | 942 | clear_proceed_status (void) |
c906108c SS |
943 | { |
944 | trap_expected = 0; | |
945 | step_range_start = 0; | |
946 | step_range_end = 0; | |
947 | step_frame_address = 0; | |
5fbbeb29 | 948 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c SS |
949 | stop_after_trap = 0; |
950 | stop_soon_quietly = 0; | |
951 | proceed_to_finish = 0; | |
952 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
953 | ||
954 | /* Discard any remaining commands or status from previous stop. */ | |
955 | bpstat_clear (&stop_bpstat); | |
956 | } | |
957 | ||
958 | /* Basic routine for continuing the program in various fashions. | |
959 | ||
960 | ADDR is the address to resume at, or -1 for resume where stopped. | |
961 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 962 | or -1 for act according to how it stopped. |
c906108c | 963 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
964 | -1 means return after that and print nothing. |
965 | You should probably set various step_... variables | |
966 | before calling here, if you are stepping. | |
c906108c SS |
967 | |
968 | You should call clear_proceed_status before calling proceed. */ | |
969 | ||
970 | void | |
96baa820 | 971 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c SS |
972 | { |
973 | int oneproc = 0; | |
974 | ||
975 | if (step > 0) | |
976 | step_start_function = find_pc_function (read_pc ()); | |
977 | if (step < 0) | |
978 | stop_after_trap = 1; | |
979 | ||
2acceee2 | 980 | if (addr == (CORE_ADDR) -1) |
c906108c SS |
981 | { |
982 | /* If there is a breakpoint at the address we will resume at, | |
c5aa993b JM |
983 | step one instruction before inserting breakpoints |
984 | so that we do not stop right away (and report a second | |
c906108c SS |
985 | hit at this breakpoint). */ |
986 | ||
987 | if (read_pc () == stop_pc && breakpoint_here_p (read_pc ())) | |
988 | oneproc = 1; | |
989 | ||
990 | #ifndef STEP_SKIPS_DELAY | |
991 | #define STEP_SKIPS_DELAY(pc) (0) | |
992 | #define STEP_SKIPS_DELAY_P (0) | |
993 | #endif | |
994 | /* Check breakpoint_here_p first, because breakpoint_here_p is fast | |
c5aa993b JM |
995 | (it just checks internal GDB data structures) and STEP_SKIPS_DELAY |
996 | is slow (it needs to read memory from the target). */ | |
c906108c SS |
997 | if (STEP_SKIPS_DELAY_P |
998 | && breakpoint_here_p (read_pc () + 4) | |
999 | && STEP_SKIPS_DELAY (read_pc ())) | |
1000 | oneproc = 1; | |
1001 | } | |
1002 | else | |
1003 | { | |
1004 | write_pc (addr); | |
1005 | ||
1006 | /* New address; we don't need to single-step a thread | |
c5aa993b JM |
1007 | over a breakpoint we just hit, 'cause we aren't |
1008 | continuing from there. | |
c906108c | 1009 | |
c5aa993b JM |
1010 | It's not worth worrying about the case where a user |
1011 | asks for a "jump" at the current PC--if they get the | |
1012 | hiccup of re-hiting a hit breakpoint, what else do | |
1013 | they expect? */ | |
c906108c SS |
1014 | thread_step_needed = 0; |
1015 | } | |
1016 | ||
1017 | #ifdef PREPARE_TO_PROCEED | |
1018 | /* In a multi-threaded task we may select another thread | |
1019 | and then continue or step. | |
1020 | ||
1021 | But if the old thread was stopped at a breakpoint, it | |
1022 | will immediately cause another breakpoint stop without | |
1023 | any execution (i.e. it will report a breakpoint hit | |
1024 | incorrectly). So we must step over it first. | |
1025 | ||
1026 | PREPARE_TO_PROCEED checks the current thread against the thread | |
1027 | that reported the most recent event. If a step-over is required | |
1028 | it returns TRUE and sets the current thread to the old thread. */ | |
9e086581 | 1029 | if (PREPARE_TO_PROCEED (1) && breakpoint_here_p (read_pc ())) |
c906108c SS |
1030 | { |
1031 | oneproc = 1; | |
1032 | thread_step_needed = 1; | |
1033 | } | |
1034 | ||
1035 | #endif /* PREPARE_TO_PROCEED */ | |
1036 | ||
1037 | #ifdef HP_OS_BUG | |
1038 | if (trap_expected_after_continue) | |
1039 | { | |
1040 | /* If (step == 0), a trap will be automatically generated after | |
c5aa993b JM |
1041 | the first instruction is executed. Force step one |
1042 | instruction to clear this condition. This should not occur | |
1043 | if step is nonzero, but it is harmless in that case. */ | |
c906108c SS |
1044 | oneproc = 1; |
1045 | trap_expected_after_continue = 0; | |
1046 | } | |
1047 | #endif /* HP_OS_BUG */ | |
1048 | ||
1049 | if (oneproc) | |
1050 | /* We will get a trace trap after one instruction. | |
1051 | Continue it automatically and insert breakpoints then. */ | |
1052 | trap_expected = 1; | |
1053 | else | |
1054 | { | |
1055 | int temp = insert_breakpoints (); | |
1056 | if (temp) | |
1057 | { | |
010a3cd9 | 1058 | print_sys_errmsg ("insert_breakpoints", temp); |
c906108c | 1059 | error ("Cannot insert breakpoints.\n\ |
010a3cd9 EZ |
1060 | The same program may be running in another process,\n\ |
1061 | or you may have requested too many hardware\n\ | |
1062 | breakpoints and/or watchpoints.\n"); | |
c906108c SS |
1063 | } |
1064 | ||
1065 | breakpoints_inserted = 1; | |
1066 | } | |
1067 | ||
1068 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
1069 | stop_signal = siggnal; | |
1070 | /* If this signal should not be seen by program, | |
1071 | give it zero. Used for debugging signals. */ | |
1072 | else if (!signal_program[stop_signal]) | |
1073 | stop_signal = TARGET_SIGNAL_0; | |
1074 | ||
1075 | annotate_starting (); | |
1076 | ||
1077 | /* Make sure that output from GDB appears before output from the | |
1078 | inferior. */ | |
1079 | gdb_flush (gdb_stdout); | |
1080 | ||
1081 | /* Resume inferior. */ | |
1082 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
1083 | ||
1084 | /* Wait for it to stop (if not standalone) | |
1085 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
1086 | /* Do this only if we are not using the event loop, or if the target |
1087 | does not support asynchronous execution. */ | |
6426a772 | 1088 | if (!event_loop_p || !target_can_async_p ()) |
43ff13b4 JM |
1089 | { |
1090 | wait_for_inferior (); | |
1091 | normal_stop (); | |
1092 | } | |
c906108c SS |
1093 | } |
1094 | ||
1095 | /* Record the pc and sp of the program the last time it stopped. | |
1096 | These are just used internally by wait_for_inferior, but need | |
1097 | to be preserved over calls to it and cleared when the inferior | |
1098 | is started. */ | |
1099 | static CORE_ADDR prev_pc; | |
1100 | static CORE_ADDR prev_func_start; | |
1101 | static char *prev_func_name; | |
1102 | \f | |
1103 | ||
1104 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 1105 | |
c906108c | 1106 | void |
96baa820 | 1107 | start_remote (void) |
c906108c SS |
1108 | { |
1109 | init_thread_list (); | |
1110 | init_wait_for_inferior (); | |
1111 | stop_soon_quietly = 1; | |
1112 | trap_expected = 0; | |
43ff13b4 | 1113 | |
6426a772 JM |
1114 | /* Always go on waiting for the target, regardless of the mode. */ |
1115 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 1116 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
1117 | nothing is returned (instead of just blocking). Because of this, |
1118 | targets expecting an immediate response need to, internally, set | |
1119 | things up so that the target_wait() is forced to eventually | |
1120 | timeout. */ | |
1121 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
1122 | differentiate to its caller what the state of the target is after | |
1123 | the initial open has been performed. Here we're assuming that | |
1124 | the target has stopped. It should be possible to eventually have | |
1125 | target_open() return to the caller an indication that the target | |
1126 | is currently running and GDB state should be set to the same as | |
1127 | for an async run. */ | |
1128 | wait_for_inferior (); | |
1129 | normal_stop (); | |
c906108c SS |
1130 | } |
1131 | ||
1132 | /* Initialize static vars when a new inferior begins. */ | |
1133 | ||
1134 | void | |
96baa820 | 1135 | init_wait_for_inferior (void) |
c906108c SS |
1136 | { |
1137 | /* These are meaningless until the first time through wait_for_inferior. */ | |
1138 | prev_pc = 0; | |
1139 | prev_func_start = 0; | |
1140 | prev_func_name = NULL; | |
1141 | ||
1142 | #ifdef HP_OS_BUG | |
1143 | trap_expected_after_continue = 0; | |
1144 | #endif | |
1145 | breakpoints_inserted = 0; | |
1146 | breakpoint_init_inferior (inf_starting); | |
1147 | ||
1148 | /* Don't confuse first call to proceed(). */ | |
1149 | stop_signal = TARGET_SIGNAL_0; | |
1150 | ||
1151 | /* The first resume is not following a fork/vfork/exec. */ | |
1152 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
1153 | pending_follow.fork_event.saw_parent_fork = 0; | |
1154 | pending_follow.fork_event.saw_child_fork = 0; | |
1155 | pending_follow.fork_event.saw_child_exec = 0; | |
1156 | ||
1157 | /* See wait_for_inferior's handling of SYSCALL_ENTRY/RETURN events. */ | |
1158 | number_of_threads_in_syscalls = 0; | |
1159 | ||
1160 | clear_proceed_status (); | |
1161 | } | |
1162 | ||
1163 | static void | |
96baa820 | 1164 | delete_breakpoint_current_contents (void *arg) |
c906108c SS |
1165 | { |
1166 | struct breakpoint **breakpointp = (struct breakpoint **) arg; | |
1167 | if (*breakpointp != NULL) | |
1168 | { | |
1169 | delete_breakpoint (*breakpointp); | |
1170 | *breakpointp = NULL; | |
1171 | } | |
1172 | } | |
1173 | \f | |
b83266a0 SS |
1174 | /* This enum encodes possible reasons for doing a target_wait, so that |
1175 | wfi can call target_wait in one place. (Ultimately the call will be | |
1176 | moved out of the infinite loop entirely.) */ | |
1177 | ||
c5aa993b JM |
1178 | enum infwait_states |
1179 | { | |
cd0fc7c3 SS |
1180 | infwait_normal_state, |
1181 | infwait_thread_hop_state, | |
1182 | infwait_nullified_state, | |
1183 | infwait_nonstep_watch_state | |
b83266a0 SS |
1184 | }; |
1185 | ||
11cf8741 JM |
1186 | /* Why did the inferior stop? Used to print the appropriate messages |
1187 | to the interface from within handle_inferior_event(). */ | |
1188 | enum inferior_stop_reason | |
1189 | { | |
1190 | /* We don't know why. */ | |
1191 | STOP_UNKNOWN, | |
1192 | /* Step, next, nexti, stepi finished. */ | |
1193 | END_STEPPING_RANGE, | |
1194 | /* Found breakpoint. */ | |
1195 | BREAKPOINT_HIT, | |
1196 | /* Inferior terminated by signal. */ | |
1197 | SIGNAL_EXITED, | |
1198 | /* Inferior exited. */ | |
1199 | EXITED, | |
1200 | /* Inferior received signal, and user asked to be notified. */ | |
1201 | SIGNAL_RECEIVED | |
1202 | }; | |
1203 | ||
cd0fc7c3 SS |
1204 | /* This structure contains what used to be local variables in |
1205 | wait_for_inferior. Probably many of them can return to being | |
1206 | locals in handle_inferior_event. */ | |
1207 | ||
c5aa993b JM |
1208 | struct execution_control_state |
1209 | { | |
1210 | struct target_waitstatus ws; | |
1211 | struct target_waitstatus *wp; | |
1212 | int another_trap; | |
1213 | int random_signal; | |
1214 | CORE_ADDR stop_func_start; | |
1215 | CORE_ADDR stop_func_end; | |
1216 | char *stop_func_name; | |
1217 | struct symtab_and_line sal; | |
1218 | int remove_breakpoints_on_following_step; | |
1219 | int current_line; | |
1220 | struct symtab *current_symtab; | |
1221 | int handling_longjmp; /* FIXME */ | |
1222 | int pid; | |
1223 | int saved_inferior_pid; | |
1224 | int update_step_sp; | |
1225 | int stepping_through_solib_after_catch; | |
1226 | bpstat stepping_through_solib_catchpoints; | |
1227 | int enable_hw_watchpoints_after_wait; | |
1228 | int stepping_through_sigtramp; | |
1229 | int new_thread_event; | |
1230 | struct target_waitstatus tmpstatus; | |
1231 | enum infwait_states infwait_state; | |
1232 | int waiton_pid; | |
1233 | int wait_some_more; | |
1234 | }; | |
1235 | ||
96baa820 | 1236 | void init_execution_control_state (struct execution_control_state * ecs); |
c5aa993b | 1237 | |
96baa820 | 1238 | void handle_inferior_event (struct execution_control_state * ecs); |
cd0fc7c3 | 1239 | |
104c1213 | 1240 | static void check_sigtramp2 (struct execution_control_state *ecs); |
c2c6d25f | 1241 | static void step_into_function (struct execution_control_state *ecs); |
d4f3574e | 1242 | static void step_over_function (struct execution_control_state *ecs); |
104c1213 JM |
1243 | static void stop_stepping (struct execution_control_state *ecs); |
1244 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 1245 | static void keep_going (struct execution_control_state *ecs); |
11cf8741 | 1246 | static void print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info); |
104c1213 | 1247 | |
cd0fc7c3 SS |
1248 | /* Wait for control to return from inferior to debugger. |
1249 | If inferior gets a signal, we may decide to start it up again | |
1250 | instead of returning. That is why there is a loop in this function. | |
1251 | When this function actually returns it means the inferior | |
1252 | should be left stopped and GDB should read more commands. */ | |
1253 | ||
1254 | void | |
96baa820 | 1255 | wait_for_inferior (void) |
cd0fc7c3 SS |
1256 | { |
1257 | struct cleanup *old_cleanups; | |
1258 | struct execution_control_state ecss; | |
1259 | struct execution_control_state *ecs; | |
c906108c SS |
1260 | |
1261 | old_cleanups = make_cleanup (delete_breakpoint_current_contents, | |
1262 | &step_resume_breakpoint); | |
1263 | make_cleanup (delete_breakpoint_current_contents, | |
1264 | &through_sigtramp_breakpoint); | |
cd0fc7c3 SS |
1265 | |
1266 | /* wfi still stays in a loop, so it's OK just to take the address of | |
1267 | a local to get the ecs pointer. */ | |
1268 | ecs = &ecss; | |
1269 | ||
1270 | /* Fill in with reasonable starting values. */ | |
1271 | init_execution_control_state (ecs); | |
1272 | ||
c906108c SS |
1273 | thread_step_needed = 0; |
1274 | ||
c906108c | 1275 | /* We'll update this if & when we switch to a new thread. */ |
c3f6f71d | 1276 | previous_inferior_pid = inferior_pid; |
c906108c | 1277 | |
cd0fc7c3 SS |
1278 | overlay_cache_invalid = 1; |
1279 | ||
1280 | /* We have to invalidate the registers BEFORE calling target_wait | |
1281 | because they can be loaded from the target while in target_wait. | |
1282 | This makes remote debugging a bit more efficient for those | |
1283 | targets that provide critical registers as part of their normal | |
1284 | status mechanism. */ | |
1285 | ||
1286 | registers_changed (); | |
b83266a0 | 1287 | |
c906108c SS |
1288 | while (1) |
1289 | { | |
cd0fc7c3 SS |
1290 | if (target_wait_hook) |
1291 | ecs->pid = target_wait_hook (ecs->waiton_pid, ecs->wp); | |
1292 | else | |
1293 | ecs->pid = target_wait (ecs->waiton_pid, ecs->wp); | |
c906108c | 1294 | |
cd0fc7c3 SS |
1295 | /* Now figure out what to do with the result of the result. */ |
1296 | handle_inferior_event (ecs); | |
c906108c | 1297 | |
cd0fc7c3 SS |
1298 | if (!ecs->wait_some_more) |
1299 | break; | |
1300 | } | |
1301 | do_cleanups (old_cleanups); | |
1302 | } | |
c906108c | 1303 | |
43ff13b4 JM |
1304 | /* Asynchronous version of wait_for_inferior. It is called by the |
1305 | event loop whenever a change of state is detected on the file | |
1306 | descriptor corresponding to the target. It can be called more than | |
1307 | once to complete a single execution command. In such cases we need | |
1308 | to keep the state in a global variable ASYNC_ECSS. If it is the | |
1309 | last time that this function is called for a single execution | |
1310 | command, then report to the user that the inferior has stopped, and | |
1311 | do the necessary cleanups. */ | |
1312 | ||
1313 | struct execution_control_state async_ecss; | |
1314 | struct execution_control_state *async_ecs; | |
1315 | ||
1316 | void | |
fba45db2 | 1317 | fetch_inferior_event (void *client_data) |
43ff13b4 JM |
1318 | { |
1319 | static struct cleanup *old_cleanups; | |
1320 | ||
c5aa993b | 1321 | async_ecs = &async_ecss; |
43ff13b4 JM |
1322 | |
1323 | if (!async_ecs->wait_some_more) | |
1324 | { | |
1325 | old_cleanups = make_exec_cleanup (delete_breakpoint_current_contents, | |
c5aa993b | 1326 | &step_resume_breakpoint); |
43ff13b4 | 1327 | make_exec_cleanup (delete_breakpoint_current_contents, |
c5aa993b | 1328 | &through_sigtramp_breakpoint); |
43ff13b4 JM |
1329 | |
1330 | /* Fill in with reasonable starting values. */ | |
1331 | init_execution_control_state (async_ecs); | |
1332 | ||
1333 | thread_step_needed = 0; | |
1334 | ||
1335 | /* We'll update this if & when we switch to a new thread. */ | |
c3f6f71d | 1336 | previous_inferior_pid = inferior_pid; |
43ff13b4 JM |
1337 | |
1338 | overlay_cache_invalid = 1; | |
1339 | ||
1340 | /* We have to invalidate the registers BEFORE calling target_wait | |
c5aa993b JM |
1341 | because they can be loaded from the target while in target_wait. |
1342 | This makes remote debugging a bit more efficient for those | |
1343 | targets that provide critical registers as part of their normal | |
1344 | status mechanism. */ | |
43ff13b4 JM |
1345 | |
1346 | registers_changed (); | |
1347 | } | |
1348 | ||
1349 | if (target_wait_hook) | |
1350 | async_ecs->pid = target_wait_hook (async_ecs->waiton_pid, async_ecs->wp); | |
1351 | else | |
1352 | async_ecs->pid = target_wait (async_ecs->waiton_pid, async_ecs->wp); | |
1353 | ||
1354 | /* Now figure out what to do with the result of the result. */ | |
1355 | handle_inferior_event (async_ecs); | |
1356 | ||
1357 | if (!async_ecs->wait_some_more) | |
1358 | { | |
adf40b2e JM |
1359 | /* Do only the cleanups that have been added by this |
1360 | function. Let the continuations for the commands do the rest, | |
1361 | if there are any. */ | |
43ff13b4 JM |
1362 | do_exec_cleanups (old_cleanups); |
1363 | normal_stop (); | |
c2d11a7d JM |
1364 | if (step_multi && stop_step) |
1365 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1366 | else | |
1367 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 JM |
1368 | } |
1369 | } | |
1370 | ||
cd0fc7c3 SS |
1371 | /* Prepare an execution control state for looping through a |
1372 | wait_for_inferior-type loop. */ | |
1373 | ||
1374 | void | |
96baa820 | 1375 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 | 1376 | { |
c2d11a7d | 1377 | /* ecs->another_trap? */ |
cd0fc7c3 SS |
1378 | ecs->random_signal = 0; |
1379 | ecs->remove_breakpoints_on_following_step = 0; | |
1380 | ecs->handling_longjmp = 0; /* FIXME */ | |
1381 | ecs->update_step_sp = 0; | |
1382 | ecs->stepping_through_solib_after_catch = 0; | |
1383 | ecs->stepping_through_solib_catchpoints = NULL; | |
1384 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1385 | ecs->stepping_through_sigtramp = 0; | |
1386 | ecs->sal = find_pc_line (prev_pc, 0); | |
1387 | ecs->current_line = ecs->sal.line; | |
1388 | ecs->current_symtab = ecs->sal.symtab; | |
1389 | ecs->infwait_state = infwait_normal_state; | |
1390 | ecs->waiton_pid = -1; | |
1391 | ecs->wp = &(ecs->ws); | |
1392 | } | |
1393 | ||
a0b3c4fd | 1394 | /* Call this function before setting step_resume_breakpoint, as a |
53a5351d JM |
1395 | sanity check. There should never be more than one step-resume |
1396 | breakpoint per thread, so we should never be setting a new | |
1397 | step_resume_breakpoint when one is already active. */ | |
a0b3c4fd | 1398 | static void |
96baa820 | 1399 | check_for_old_step_resume_breakpoint (void) |
a0b3c4fd JM |
1400 | { |
1401 | if (step_resume_breakpoint) | |
1402 | warning ("GDB bug: infrun.c (wait_for_inferior): dropping old step_resume breakpoint"); | |
1403 | } | |
1404 | ||
cd0fc7c3 SS |
1405 | /* Given an execution control state that has been freshly filled in |
1406 | by an event from the inferior, figure out what it means and take | |
1407 | appropriate action. */ | |
c906108c | 1408 | |
cd0fc7c3 | 1409 | void |
96baa820 | 1410 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 SS |
1411 | { |
1412 | CORE_ADDR tmp; | |
1413 | int stepped_after_stopped_by_watchpoint; | |
1414 | ||
1415 | /* Keep this extra brace for now, minimizes diffs. */ | |
1416 | { | |
c5aa993b JM |
1417 | switch (ecs->infwait_state) |
1418 | { | |
1419 | case infwait_normal_state: | |
1420 | /* Since we've done a wait, we have a new event. Don't | |
1421 | carry over any expectations about needing to step over a | |
1422 | breakpoint. */ | |
1423 | thread_step_needed = 0; | |
1424 | ||
1425 | /* See comments where a TARGET_WAITKIND_SYSCALL_RETURN event | |
1426 | is serviced in this loop, below. */ | |
1427 | if (ecs->enable_hw_watchpoints_after_wait) | |
1428 | { | |
1429 | TARGET_ENABLE_HW_WATCHPOINTS (inferior_pid); | |
1430 | ecs->enable_hw_watchpoints_after_wait = 0; | |
1431 | } | |
1432 | stepped_after_stopped_by_watchpoint = 0; | |
1433 | break; | |
b83266a0 | 1434 | |
c5aa993b JM |
1435 | case infwait_thread_hop_state: |
1436 | insert_breakpoints (); | |
c906108c | 1437 | |
c5aa993b | 1438 | /* We need to restart all the threads now, |
3cbb88dc | 1439 | * unless we're running in scheduler-locked mode. |
c5aa993b JM |
1440 | * FIXME: shouldn't we look at currently_stepping ()? |
1441 | */ | |
1442 | if (scheduler_mode == schedlock_on) | |
1443 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
1444 | else | |
1445 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
1446 | ecs->infwait_state = infwait_normal_state; | |
104c1213 JM |
1447 | prepare_to_wait (ecs); |
1448 | return; | |
c906108c | 1449 | |
c5aa993b JM |
1450 | case infwait_nullified_state: |
1451 | break; | |
b83266a0 | 1452 | |
c5aa993b JM |
1453 | case infwait_nonstep_watch_state: |
1454 | insert_breakpoints (); | |
b83266a0 | 1455 | |
c5aa993b JM |
1456 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1457 | handle things like signals arriving and other things happening | |
1458 | in combination correctly? */ | |
1459 | stepped_after_stopped_by_watchpoint = 1; | |
1460 | break; | |
1461 | } | |
1462 | ecs->infwait_state = infwait_normal_state; | |
c906108c | 1463 | |
c5aa993b | 1464 | flush_cached_frames (); |
c906108c | 1465 | |
c5aa993b | 1466 | /* If it's a new process, add it to the thread database */ |
c906108c | 1467 | |
c5aa993b | 1468 | ecs->new_thread_event = ((ecs->pid != inferior_pid) && !in_thread_list (ecs->pid)); |
c906108c | 1469 | |
c5aa993b JM |
1470 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED |
1471 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED | |
1472 | && ecs->new_thread_event) | |
1473 | { | |
1474 | add_thread (ecs->pid); | |
c906108c | 1475 | |
8b93c638 JM |
1476 | #ifdef UI_OUT |
1477 | ui_out_text (uiout, "[New "); | |
1478 | ui_out_text (uiout, target_pid_or_tid_to_str (ecs->pid)); | |
1479 | ui_out_text (uiout, "]\n"); | |
1480 | #else | |
c5aa993b | 1481 | printf_filtered ("[New %s]\n", target_pid_or_tid_to_str (ecs->pid)); |
8b93c638 | 1482 | #endif |
c906108c SS |
1483 | |
1484 | #if 0 | |
c5aa993b JM |
1485 | /* NOTE: This block is ONLY meant to be invoked in case of a |
1486 | "thread creation event"! If it is invoked for any other | |
1487 | sort of event (such as a new thread landing on a breakpoint), | |
1488 | the event will be discarded, which is almost certainly | |
1489 | a bad thing! | |
1490 | ||
1491 | To avoid this, the low-level module (eg. target_wait) | |
1492 | should call in_thread_list and add_thread, so that the | |
1493 | new thread is known by the time we get here. */ | |
1494 | ||
1495 | /* We may want to consider not doing a resume here in order | |
1496 | to give the user a chance to play with the new thread. | |
1497 | It might be good to make that a user-settable option. */ | |
1498 | ||
1499 | /* At this point, all threads are stopped (happens | |
1500 | automatically in either the OS or the native code). | |
1501 | Therefore we need to continue all threads in order to | |
1502 | make progress. */ | |
1503 | ||
1504 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1505 | prepare_to_wait (ecs); |
1506 | return; | |
c906108c | 1507 | #endif |
c5aa993b | 1508 | } |
c906108c | 1509 | |
c5aa993b JM |
1510 | switch (ecs->ws.kind) |
1511 | { | |
1512 | case TARGET_WAITKIND_LOADED: | |
1513 | /* Ignore gracefully during startup of the inferior, as it | |
1514 | might be the shell which has just loaded some objects, | |
1515 | otherwise add the symbols for the newly loaded objects. */ | |
c906108c | 1516 | #ifdef SOLIB_ADD |
c5aa993b JM |
1517 | if (!stop_soon_quietly) |
1518 | { | |
1519 | /* Remove breakpoints, SOLIB_ADD might adjust | |
1520 | breakpoint addresses via breakpoint_re_set. */ | |
1521 | if (breakpoints_inserted) | |
1522 | remove_breakpoints (); | |
c906108c | 1523 | |
c5aa993b JM |
1524 | /* Check for any newly added shared libraries if we're |
1525 | supposed to be adding them automatically. */ | |
1526 | if (auto_solib_add) | |
1527 | { | |
1528 | /* Switch terminal for any messages produced by | |
1529 | breakpoint_re_set. */ | |
1530 | target_terminal_ours_for_output (); | |
1531 | SOLIB_ADD (NULL, 0, NULL); | |
1532 | target_terminal_inferior (); | |
1533 | } | |
c906108c | 1534 | |
c5aa993b JM |
1535 | /* Reinsert breakpoints and continue. */ |
1536 | if (breakpoints_inserted) | |
1537 | insert_breakpoints (); | |
1538 | } | |
c906108c | 1539 | #endif |
c5aa993b | 1540 | resume (0, TARGET_SIGNAL_0); |
104c1213 JM |
1541 | prepare_to_wait (ecs); |
1542 | return; | |
c5aa993b JM |
1543 | |
1544 | case TARGET_WAITKIND_SPURIOUS: | |
1545 | resume (0, TARGET_SIGNAL_0); | |
104c1213 JM |
1546 | prepare_to_wait (ecs); |
1547 | return; | |
c5aa993b JM |
1548 | |
1549 | case TARGET_WAITKIND_EXITED: | |
1550 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
11cf8741 | 1551 | print_stop_reason (EXITED, ecs->ws.value.integer); |
c5aa993b JM |
1552 | |
1553 | /* Record the exit code in the convenience variable $_exitcode, so | |
1554 | that the user can inspect this again later. */ | |
1555 | set_internalvar (lookup_internalvar ("_exitcode"), | |
1556 | value_from_longest (builtin_type_int, | |
1557 | (LONGEST) ecs->ws.value.integer)); | |
1558 | gdb_flush (gdb_stdout); | |
1559 | target_mourn_inferior (); | |
1560 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P */ | |
1561 | stop_print_frame = 0; | |
104c1213 JM |
1562 | stop_stepping (ecs); |
1563 | return; | |
c5aa993b JM |
1564 | |
1565 | case TARGET_WAITKIND_SIGNALLED: | |
1566 | stop_print_frame = 0; | |
1567 | stop_signal = ecs->ws.value.sig; | |
1568 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 1569 | |
c7e79b4b ND |
1570 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
1571 | reach here unless the inferior is dead. However, for years | |
1572 | target_kill() was called here, which hints that fatal signals aren't | |
1573 | really fatal on some systems. If that's true, then some changes | |
1574 | may be needed. */ | |
1575 | target_mourn_inferior (); | |
c5aa993b | 1576 | |
11cf8741 | 1577 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
c5aa993b | 1578 | singlestep_breakpoints_inserted_p = 0; /*SOFTWARE_SINGLE_STEP_P */ |
104c1213 JM |
1579 | stop_stepping (ecs); |
1580 | return; | |
c5aa993b JM |
1581 | |
1582 | /* The following are the only cases in which we keep going; | |
1583 | the above cases end in a continue or goto. */ | |
1584 | case TARGET_WAITKIND_FORKED: | |
1585 | stop_signal = TARGET_SIGNAL_TRAP; | |
1586 | pending_follow.kind = ecs->ws.kind; | |
1587 | ||
1588 | /* Ignore fork events reported for the parent; we're only | |
1589 | interested in reacting to forks of the child. Note that | |
1590 | we expect the child's fork event to be available if we | |
1591 | waited for it now. */ | |
1592 | if (inferior_pid == ecs->pid) | |
1593 | { | |
1594 | pending_follow.fork_event.saw_parent_fork = 1; | |
1595 | pending_follow.fork_event.parent_pid = ecs->pid; | |
1596 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
104c1213 JM |
1597 | prepare_to_wait (ecs); |
1598 | return; | |
c5aa993b JM |
1599 | } |
1600 | else | |
1601 | { | |
1602 | pending_follow.fork_event.saw_child_fork = 1; | |
1603 | pending_follow.fork_event.child_pid = ecs->pid; | |
1604 | pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid; | |
1605 | } | |
c906108c | 1606 | |
c5aa993b JM |
1607 | stop_pc = read_pc_pid (ecs->pid); |
1608 | ecs->saved_inferior_pid = inferior_pid; | |
1609 | inferior_pid = ecs->pid; | |
6426a772 | 1610 | stop_bpstat = bpstat_stop_status (&stop_pc, currently_stepping (ecs)); |
c5aa993b JM |
1611 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1612 | inferior_pid = ecs->saved_inferior_pid; | |
1613 | goto process_event_stop_test; | |
1614 | ||
1615 | /* If this a platform which doesn't allow a debugger to touch a | |
1616 | vfork'd inferior until after it exec's, then we'd best keep | |
1617 | our fingers entirely off the inferior, other than continuing | |
1618 | it. This has the unfortunate side-effect that catchpoints | |
1619 | of vforks will be ignored. But since the platform doesn't | |
1620 | allow the inferior be touched at vfork time, there's really | |
1621 | little choice. */ | |
1622 | case TARGET_WAITKIND_VFORKED: | |
1623 | stop_signal = TARGET_SIGNAL_TRAP; | |
1624 | pending_follow.kind = ecs->ws.kind; | |
1625 | ||
1626 | /* Is this a vfork of the parent? If so, then give any | |
1627 | vfork catchpoints a chance to trigger now. (It's | |
1628 | dangerous to do so if the child canot be touched until | |
1629 | it execs, and the child has not yet exec'd. We probably | |
1630 | should warn the user to that effect when the catchpoint | |
1631 | triggers...) */ | |
1632 | if (ecs->pid == inferior_pid) | |
1633 | { | |
1634 | pending_follow.fork_event.saw_parent_fork = 1; | |
1635 | pending_follow.fork_event.parent_pid = ecs->pid; | |
1636 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; | |
1637 | } | |
c906108c | 1638 | |
c5aa993b JM |
1639 | /* If we've seen the child's vfork event but cannot really touch |
1640 | the child until it execs, then we must continue the child now. | |
1641 | Else, give any vfork catchpoints a chance to trigger now. */ | |
1642 | else | |
1643 | { | |
1644 | pending_follow.fork_event.saw_child_fork = 1; | |
1645 | pending_follow.fork_event.child_pid = ecs->pid; | |
1646 | pending_follow.fork_event.parent_pid = ecs->ws.value.related_pid; | |
1647 | target_post_startup_inferior (pending_follow.fork_event.child_pid); | |
1648 | follow_vfork_when_exec = !target_can_follow_vfork_prior_to_exec (); | |
1649 | if (follow_vfork_when_exec) | |
1650 | { | |
1651 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1652 | prepare_to_wait (ecs); |
1653 | return; | |
c5aa993b JM |
1654 | } |
1655 | } | |
c906108c | 1656 | |
c5aa993b | 1657 | stop_pc = read_pc (); |
6426a772 | 1658 | stop_bpstat = bpstat_stop_status (&stop_pc, currently_stepping (ecs)); |
c5aa993b JM |
1659 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1660 | goto process_event_stop_test; | |
1661 | ||
1662 | case TARGET_WAITKIND_EXECD: | |
1663 | stop_signal = TARGET_SIGNAL_TRAP; | |
1664 | ||
1665 | /* Is this a target which reports multiple exec events per actual | |
1666 | call to exec()? (HP-UX using ptrace does, for example.) If so, | |
1667 | ignore all but the last one. Just resume the exec'r, and wait | |
1668 | for the next exec event. */ | |
1669 | if (inferior_ignoring_leading_exec_events) | |
1670 | { | |
1671 | inferior_ignoring_leading_exec_events--; | |
1672 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1673 | ENSURE_VFORKING_PARENT_REMAINS_STOPPED (pending_follow.fork_event.parent_pid); | |
1674 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1675 | prepare_to_wait (ecs); |
1676 | return; | |
c5aa993b JM |
1677 | } |
1678 | inferior_ignoring_leading_exec_events = | |
1679 | target_reported_exec_events_per_exec_call () - 1; | |
c906108c | 1680 | |
96baa820 JM |
1681 | pending_follow.execd_pathname = |
1682 | savestring (ecs->ws.value.execd_pathname, | |
1683 | strlen (ecs->ws.value.execd_pathname)); | |
c906108c | 1684 | |
c5aa993b JM |
1685 | /* Did inferior_pid exec, or did a (possibly not-yet-followed) |
1686 | child of a vfork exec? | |
c906108c | 1687 | |
c5aa993b JM |
1688 | ??rehrauer: This is unabashedly an HP-UX specific thing. On |
1689 | HP-UX, events associated with a vforking inferior come in | |
1690 | threes: a vfork event for the child (always first), followed | |
1691 | a vfork event for the parent and an exec event for the child. | |
1692 | The latter two can come in either order. | |
c906108c | 1693 | |
c5aa993b JM |
1694 | If we get the parent vfork event first, life's good: We follow |
1695 | either the parent or child, and then the child's exec event is | |
1696 | a "don't care". | |
c906108c | 1697 | |
c5aa993b JM |
1698 | But if we get the child's exec event first, then we delay |
1699 | responding to it until we handle the parent's vfork. Because, | |
1700 | otherwise we can't satisfy a "catch vfork". */ | |
1701 | if (pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
1702 | { | |
1703 | pending_follow.fork_event.saw_child_exec = 1; | |
1704 | ||
1705 | /* On some targets, the child must be resumed before | |
1706 | the parent vfork event is delivered. A single-step | |
1707 | suffices. */ | |
1708 | if (RESUME_EXECD_VFORKING_CHILD_TO_GET_PARENT_VFORK ()) | |
1709 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
1710 | /* We expect the parent vfork event to be available now. */ | |
104c1213 JM |
1711 | prepare_to_wait (ecs); |
1712 | return; | |
c5aa993b | 1713 | } |
c906108c | 1714 | |
c5aa993b JM |
1715 | /* This causes the eventpoints and symbol table to be reset. Must |
1716 | do this now, before trying to determine whether to stop. */ | |
1717 | follow_exec (inferior_pid, pending_follow.execd_pathname); | |
1718 | free (pending_follow.execd_pathname); | |
1719 | ||
1720 | stop_pc = read_pc_pid (ecs->pid); | |
1721 | ecs->saved_inferior_pid = inferior_pid; | |
1722 | inferior_pid = ecs->pid; | |
6426a772 | 1723 | stop_bpstat = bpstat_stop_status (&stop_pc, currently_stepping (ecs)); |
c5aa993b JM |
1724 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
1725 | inferior_pid = ecs->saved_inferior_pid; | |
1726 | goto process_event_stop_test; | |
1727 | ||
1728 | /* These syscall events are returned on HP-UX, as part of its | |
1729 | implementation of page-protection-based "hardware" watchpoints. | |
1730 | HP-UX has unfortunate interactions between page-protections and | |
1731 | some system calls. Our solution is to disable hardware watches | |
1732 | when a system call is entered, and reenable them when the syscall | |
1733 | completes. The downside of this is that we may miss the precise | |
1734 | point at which a watched piece of memory is modified. "Oh well." | |
1735 | ||
1736 | Note that we may have multiple threads running, which may each | |
1737 | enter syscalls at roughly the same time. Since we don't have a | |
1738 | good notion currently of whether a watched piece of memory is | |
1739 | thread-private, we'd best not have any page-protections active | |
1740 | when any thread is in a syscall. Thus, we only want to reenable | |
1741 | hardware watches when no threads are in a syscall. | |
1742 | ||
1743 | Also, be careful not to try to gather much state about a thread | |
1744 | that's in a syscall. It's frequently a losing proposition. */ | |
1745 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
1746 | number_of_threads_in_syscalls++; | |
1747 | if (number_of_threads_in_syscalls == 1) | |
1748 | { | |
1749 | TARGET_DISABLE_HW_WATCHPOINTS (inferior_pid); | |
1750 | } | |
1751 | resume (0, TARGET_SIGNAL_0); | |
104c1213 JM |
1752 | prepare_to_wait (ecs); |
1753 | return; | |
c906108c | 1754 | |
c5aa993b | 1755 | /* Before examining the threads further, step this thread to |
c906108c SS |
1756 | get it entirely out of the syscall. (We get notice of the |
1757 | event when the thread is just on the verge of exiting a | |
1758 | syscall. Stepping one instruction seems to get it back | |
1759 | into user code.) | |
1760 | ||
1761 | Note that although the logical place to reenable h/w watches | |
1762 | is here, we cannot. We cannot reenable them before stepping | |
1763 | the thread (this causes the next wait on the thread to hang). | |
1764 | ||
1765 | Nor can we enable them after stepping until we've done a wait. | |
cd0fc7c3 | 1766 | Thus, we simply set the flag ecs->enable_hw_watchpoints_after_wait |
c906108c SS |
1767 | here, which will be serviced immediately after the target |
1768 | is waited on. */ | |
c5aa993b JM |
1769 | case TARGET_WAITKIND_SYSCALL_RETURN: |
1770 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
c906108c | 1771 | |
c5aa993b JM |
1772 | if (number_of_threads_in_syscalls > 0) |
1773 | { | |
1774 | number_of_threads_in_syscalls--; | |
1775 | ecs->enable_hw_watchpoints_after_wait = | |
1776 | (number_of_threads_in_syscalls == 0); | |
1777 | } | |
104c1213 JM |
1778 | prepare_to_wait (ecs); |
1779 | return; | |
c906108c | 1780 | |
c5aa993b JM |
1781 | case TARGET_WAITKIND_STOPPED: |
1782 | stop_signal = ecs->ws.value.sig; | |
1783 | break; | |
c4093a6a JM |
1784 | |
1785 | /* We had an event in the inferior, but we are not interested | |
1786 | in handling it at this level. The lower layers have already | |
1787 | done what needs to be done, if anything. This case can | |
1788 | occur only when the target is async or extended-async. One | |
1789 | of the circumstamces for this to happen is when the | |
1790 | inferior produces output for the console. The inferior has | |
1791 | not stopped, and we are ignoring the event. */ | |
1792 | case TARGET_WAITKIND_IGNORE: | |
1793 | ecs->wait_some_more = 1; | |
1794 | return; | |
c5aa993b | 1795 | } |
c906108c | 1796 | |
c5aa993b JM |
1797 | /* We may want to consider not doing a resume here in order to give |
1798 | the user a chance to play with the new thread. It might be good | |
1799 | to make that a user-settable option. */ | |
c906108c | 1800 | |
c5aa993b JM |
1801 | /* At this point, all threads are stopped (happens automatically in |
1802 | either the OS or the native code). Therefore we need to continue | |
1803 | all threads in order to make progress. */ | |
1804 | if (ecs->new_thread_event) | |
1805 | { | |
1806 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1807 | prepare_to_wait (ecs); |
1808 | return; | |
c5aa993b | 1809 | } |
c906108c | 1810 | |
c5aa993b | 1811 | stop_pc = read_pc_pid (ecs->pid); |
c906108c | 1812 | |
c5aa993b JM |
1813 | /* See if a thread hit a thread-specific breakpoint that was meant for |
1814 | another thread. If so, then step that thread past the breakpoint, | |
1815 | and continue it. */ | |
c906108c | 1816 | |
c5aa993b JM |
1817 | if (stop_signal == TARGET_SIGNAL_TRAP) |
1818 | { | |
1819 | if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p) | |
1820 | ecs->random_signal = 0; | |
1821 | else if (breakpoints_inserted | |
1822 | && breakpoint_here_p (stop_pc - DECR_PC_AFTER_BREAK)) | |
1823 | { | |
cd0fc7c3 | 1824 | ecs->random_signal = 0; |
c5aa993b JM |
1825 | if (!breakpoint_thread_match (stop_pc - DECR_PC_AFTER_BREAK, |
1826 | ecs->pid)) | |
1827 | { | |
1828 | int remove_status; | |
1829 | ||
1830 | /* Saw a breakpoint, but it was hit by the wrong thread. | |
1831 | Just continue. */ | |
1832 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK, ecs->pid); | |
1833 | ||
1834 | remove_status = remove_breakpoints (); | |
1835 | /* Did we fail to remove breakpoints? If so, try | |
1836 | to set the PC past the bp. (There's at least | |
1837 | one situation in which we can fail to remove | |
1838 | the bp's: On HP-UX's that use ttrace, we can't | |
1839 | change the address space of a vforking child | |
1840 | process until the child exits (well, okay, not | |
1841 | then either :-) or execs. */ | |
1842 | if (remove_status != 0) | |
1843 | { | |
1844 | write_pc_pid (stop_pc - DECR_PC_AFTER_BREAK + 4, ecs->pid); | |
1845 | } | |
1846 | else | |
1847 | { /* Single step */ | |
1848 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
1849 | /* FIXME: What if a signal arrives instead of the | |
1850 | single-step happening? */ | |
1851 | ||
1852 | ecs->waiton_pid = ecs->pid; | |
1853 | ecs->wp = &(ecs->ws); | |
1854 | ecs->infwait_state = infwait_thread_hop_state; | |
104c1213 JM |
1855 | prepare_to_wait (ecs); |
1856 | return; | |
c5aa993b | 1857 | } |
c906108c | 1858 | |
c5aa993b JM |
1859 | /* We need to restart all the threads now, |
1860 | * unles we're running in scheduler-locked mode. | |
1861 | * FIXME: shouldn't we look at currently_stepping ()? | |
1862 | */ | |
1863 | if (scheduler_mode == schedlock_on) | |
1864 | target_resume (ecs->pid, 0, TARGET_SIGNAL_0); | |
1865 | else | |
1866 | target_resume (-1, 0, TARGET_SIGNAL_0); | |
104c1213 JM |
1867 | prepare_to_wait (ecs); |
1868 | return; | |
c5aa993b JM |
1869 | } |
1870 | else | |
1871 | { | |
1872 | /* This breakpoint matches--either it is the right | |
1873 | thread or it's a generic breakpoint for all threads. | |
1874 | Remember that we'll need to step just _this_ thread | |
1875 | on any following user continuation! */ | |
1876 | thread_step_needed = 1; | |
1877 | } | |
1878 | } | |
1879 | } | |
1880 | else | |
1881 | ecs->random_signal = 1; | |
1882 | ||
1883 | /* See if something interesting happened to the non-current thread. If | |
1884 | so, then switch to that thread, and eventually give control back to | |
1885 | the user. | |
1886 | ||
1887 | Note that if there's any kind of pending follow (i.e., of a fork, | |
1888 | vfork or exec), we don't want to do this now. Rather, we'll let | |
1889 | the next resume handle it. */ | |
1890 | if ((ecs->pid != inferior_pid) && | |
1891 | (pending_follow.kind == TARGET_WAITKIND_SPURIOUS)) | |
1892 | { | |
1893 | int printed = 0; | |
c906108c | 1894 | |
c5aa993b JM |
1895 | /* If it's a random signal for a non-current thread, notify user |
1896 | if he's expressed an interest. */ | |
1897 | if (ecs->random_signal | |
1898 | && signal_print[stop_signal]) | |
1899 | { | |
c906108c SS |
1900 | /* ??rehrauer: I don't understand the rationale for this code. If the |
1901 | inferior will stop as a result of this signal, then the act of handling | |
1902 | the stop ought to print a message that's couches the stoppage in user | |
1903 | terms, e.g., "Stopped for breakpoint/watchpoint". If the inferior | |
1904 | won't stop as a result of the signal -- i.e., if the signal is merely | |
1905 | a side-effect of something GDB's doing "under the covers" for the | |
1906 | user, such as stepping threads over a breakpoint they shouldn't stop | |
1907 | for -- then the message seems to be a serious annoyance at best. | |
1908 | ||
1909 | For now, remove the message altogether. */ | |
1910 | #if 0 | |
c5aa993b JM |
1911 | printed = 1; |
1912 | target_terminal_ours_for_output (); | |
1913 | printf_filtered ("\nProgram received signal %s, %s.\n", | |
1914 | target_signal_to_name (stop_signal), | |
1915 | target_signal_to_string (stop_signal)); | |
1916 | gdb_flush (gdb_stdout); | |
c906108c | 1917 | #endif |
c5aa993b | 1918 | } |
c906108c | 1919 | |
c5aa993b JM |
1920 | /* If it's not SIGTRAP and not a signal we want to stop for, then |
1921 | continue the thread. */ | |
c906108c | 1922 | |
c5aa993b JM |
1923 | if (stop_signal != TARGET_SIGNAL_TRAP |
1924 | && !signal_stop[stop_signal]) | |
1925 | { | |
1926 | if (printed) | |
1927 | target_terminal_inferior (); | |
c906108c | 1928 | |
c5aa993b JM |
1929 | /* Clear the signal if it should not be passed. */ |
1930 | if (signal_program[stop_signal] == 0) | |
1931 | stop_signal = TARGET_SIGNAL_0; | |
c906108c | 1932 | |
c5aa993b | 1933 | target_resume (ecs->pid, 0, stop_signal); |
104c1213 JM |
1934 | prepare_to_wait (ecs); |
1935 | return; | |
c5aa993b | 1936 | } |
c906108c | 1937 | |
c5aa993b JM |
1938 | /* It's a SIGTRAP or a signal we're interested in. Switch threads, |
1939 | and fall into the rest of wait_for_inferior(). */ | |
1940 | ||
c2d11a7d JM |
1941 | /* Caution: it may happen that the new thread (or the old one!) |
1942 | is not in the thread list. In this case we must not attempt | |
1943 | to "switch context", or we run the risk that our context may | |
1944 | be lost. This may happen as a result of the target module | |
1945 | mishandling thread creation. */ | |
1946 | ||
1947 | if (in_thread_list (inferior_pid) && in_thread_list (ecs->pid)) | |
1948 | { /* Perform infrun state context switch: */ | |
1949 | /* Save infrun state for the old thread. */ | |
1950 | save_infrun_state (inferior_pid, prev_pc, | |
1951 | prev_func_start, prev_func_name, | |
1952 | trap_expected, step_resume_breakpoint, | |
1953 | through_sigtramp_breakpoint, | |
1954 | step_range_start, step_range_end, | |
1955 | step_frame_address, ecs->handling_longjmp, | |
1956 | ecs->another_trap, | |
1957 | ecs->stepping_through_solib_after_catch, | |
1958 | ecs->stepping_through_solib_catchpoints, | |
1959 | ecs->stepping_through_sigtramp); | |
1960 | ||
1961 | /* Load infrun state for the new thread. */ | |
1962 | load_infrun_state (ecs->pid, &prev_pc, | |
1963 | &prev_func_start, &prev_func_name, | |
1964 | &trap_expected, &step_resume_breakpoint, | |
1965 | &through_sigtramp_breakpoint, | |
1966 | &step_range_start, &step_range_end, | |
1967 | &step_frame_address, &ecs->handling_longjmp, | |
1968 | &ecs->another_trap, | |
1969 | &ecs->stepping_through_solib_after_catch, | |
1970 | &ecs->stepping_through_solib_catchpoints, | |
1971 | &ecs->stepping_through_sigtramp); | |
1972 | } | |
c5aa993b JM |
1973 | |
1974 | inferior_pid = ecs->pid; | |
1975 | ||
c5aa993b JM |
1976 | if (context_hook) |
1977 | context_hook (pid_to_thread_id (ecs->pid)); | |
1978 | ||
c5aa993b JM |
1979 | flush_cached_frames (); |
1980 | } | |
c906108c | 1981 | |
c5aa993b JM |
1982 | if (SOFTWARE_SINGLE_STEP_P && singlestep_breakpoints_inserted_p) |
1983 | { | |
1984 | /* Pull the single step breakpoints out of the target. */ | |
1985 | SOFTWARE_SINGLE_STEP (0, 0); | |
1986 | singlestep_breakpoints_inserted_p = 0; | |
1987 | } | |
c906108c | 1988 | |
c5aa993b JM |
1989 | /* If PC is pointing at a nullified instruction, then step beyond |
1990 | it so that the user won't be confused when GDB appears to be ready | |
1991 | to execute it. */ | |
c906108c | 1992 | |
c5aa993b JM |
1993 | /* if (INSTRUCTION_NULLIFIED && currently_stepping (ecs)) */ |
1994 | if (INSTRUCTION_NULLIFIED) | |
1995 | { | |
1996 | registers_changed (); | |
1997 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); | |
c906108c | 1998 | |
c5aa993b JM |
1999 | /* We may have received a signal that we want to pass to |
2000 | the inferior; therefore, we must not clobber the waitstatus | |
2001 | in WS. */ | |
c906108c | 2002 | |
c5aa993b JM |
2003 | ecs->infwait_state = infwait_nullified_state; |
2004 | ecs->waiton_pid = ecs->pid; | |
2005 | ecs->wp = &(ecs->tmpstatus); | |
104c1213 JM |
2006 | prepare_to_wait (ecs); |
2007 | return; | |
c5aa993b | 2008 | } |
c906108c | 2009 | |
c5aa993b JM |
2010 | /* It may not be necessary to disable the watchpoint to stop over |
2011 | it. For example, the PA can (with some kernel cooperation) | |
2012 | single step over a watchpoint without disabling the watchpoint. */ | |
2013 | if (HAVE_STEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
2014 | { | |
2015 | resume (1, 0); | |
104c1213 JM |
2016 | prepare_to_wait (ecs); |
2017 | return; | |
c5aa993b | 2018 | } |
c906108c | 2019 | |
c5aa993b JM |
2020 | /* It is far more common to need to disable a watchpoint to step |
2021 | the inferior over it. FIXME. What else might a debug | |
2022 | register or page protection watchpoint scheme need here? */ | |
2023 | if (HAVE_NONSTEPPABLE_WATCHPOINT && STOPPED_BY_WATCHPOINT (ecs->ws)) | |
2024 | { | |
2025 | /* At this point, we are stopped at an instruction which has | |
2026 | attempted to write to a piece of memory under control of | |
2027 | a watchpoint. The instruction hasn't actually executed | |
2028 | yet. If we were to evaluate the watchpoint expression | |
2029 | now, we would get the old value, and therefore no change | |
2030 | would seem to have occurred. | |
2031 | ||
2032 | In order to make watchpoints work `right', we really need | |
2033 | to complete the memory write, and then evaluate the | |
2034 | watchpoint expression. The following code does that by | |
2035 | removing the watchpoint (actually, all watchpoints and | |
2036 | breakpoints), single-stepping the target, re-inserting | |
2037 | watchpoints, and then falling through to let normal | |
2038 | single-step processing handle proceed. Since this | |
2039 | includes evaluating watchpoints, things will come to a | |
2040 | stop in the correct manner. */ | |
2041 | ||
2042 | write_pc (stop_pc - DECR_PC_AFTER_BREAK); | |
2043 | ||
2044 | remove_breakpoints (); | |
2045 | registers_changed (); | |
2046 | target_resume (ecs->pid, 1, TARGET_SIGNAL_0); /* Single step */ | |
2047 | ||
2048 | ecs->waiton_pid = ecs->pid; | |
2049 | ecs->wp = &(ecs->ws); | |
2050 | ecs->infwait_state = infwait_nonstep_watch_state; | |
104c1213 JM |
2051 | prepare_to_wait (ecs); |
2052 | return; | |
c5aa993b | 2053 | } |
c906108c | 2054 | |
c5aa993b JM |
2055 | /* It may be possible to simply continue after a watchpoint. */ |
2056 | if (HAVE_CONTINUABLE_WATCHPOINT) | |
2057 | STOPPED_BY_WATCHPOINT (ecs->ws); | |
2058 | ||
2059 | ecs->stop_func_start = 0; | |
2060 | ecs->stop_func_end = 0; | |
2061 | ecs->stop_func_name = 0; | |
2062 | /* Don't care about return value; stop_func_start and stop_func_name | |
2063 | will both be 0 if it doesn't work. */ | |
2064 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
2065 | &ecs->stop_func_start, &ecs->stop_func_end); | |
2066 | ecs->stop_func_start += FUNCTION_START_OFFSET; | |
2067 | ecs->another_trap = 0; | |
2068 | bpstat_clear (&stop_bpstat); | |
2069 | stop_step = 0; | |
2070 | stop_stack_dummy = 0; | |
2071 | stop_print_frame = 1; | |
2072 | ecs->random_signal = 0; | |
2073 | stopped_by_random_signal = 0; | |
2074 | breakpoints_failed = 0; | |
2075 | ||
2076 | /* Look at the cause of the stop, and decide what to do. | |
2077 | The alternatives are: | |
2078 | 1) break; to really stop and return to the debugger, | |
2079 | 2) drop through to start up again | |
2080 | (set ecs->another_trap to 1 to single step once) | |
2081 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 | |
2082 | will be made according to the signal handling tables. */ | |
2083 | ||
2084 | /* First, distinguish signals caused by the debugger from signals | |
2085 | that have to do with the program's own actions. | |
2086 | Note that breakpoint insns may cause SIGTRAP or SIGILL | |
2087 | or SIGEMT, depending on the operating system version. | |
2088 | Here we detect when a SIGILL or SIGEMT is really a breakpoint | |
2089 | and change it to SIGTRAP. */ | |
2090 | ||
2091 | if (stop_signal == TARGET_SIGNAL_TRAP | |
2092 | || (breakpoints_inserted && | |
2093 | (stop_signal == TARGET_SIGNAL_ILL | |
2094 | || stop_signal == TARGET_SIGNAL_EMT | |
2095 | )) | |
2096 | || stop_soon_quietly) | |
2097 | { | |
2098 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
2099 | { | |
2100 | stop_print_frame = 0; | |
104c1213 JM |
2101 | stop_stepping (ecs); |
2102 | return; | |
c5aa993b JM |
2103 | } |
2104 | if (stop_soon_quietly) | |
104c1213 JM |
2105 | { |
2106 | stop_stepping (ecs); | |
2107 | return; | |
2108 | } | |
c906108c | 2109 | |
c5aa993b JM |
2110 | /* Don't even think about breakpoints |
2111 | if just proceeded over a breakpoint. | |
c906108c | 2112 | |
c5aa993b JM |
2113 | However, if we are trying to proceed over a breakpoint |
2114 | and end up in sigtramp, then through_sigtramp_breakpoint | |
2115 | will be set and we should check whether we've hit the | |
2116 | step breakpoint. */ | |
2117 | if (stop_signal == TARGET_SIGNAL_TRAP && trap_expected | |
2118 | && through_sigtramp_breakpoint == NULL) | |
2119 | bpstat_clear (&stop_bpstat); | |
2120 | else | |
2121 | { | |
2122 | /* See if there is a breakpoint at the current PC. */ | |
2123 | stop_bpstat = bpstat_stop_status | |
2124 | (&stop_pc, | |
6426a772 JM |
2125 | /* Pass TRUE if our reason for stopping is something other |
2126 | than hitting a breakpoint. We do this by checking that | |
2127 | 1) stepping is going on and 2) we didn't hit a breakpoint | |
2128 | in a signal handler without an intervening stop in | |
2129 | sigtramp, which is detected by a new stack pointer value | |
2130 | below any usual function calling stack adjustments. */ | |
c5aa993b | 2131 | (currently_stepping (ecs) |
c5aa993b | 2132 | && !(step_range_end |
6426a772 | 2133 | && INNER_THAN (read_sp (), (step_sp - 16)))) |
c5aa993b JM |
2134 | ); |
2135 | /* Following in case break condition called a | |
2136 | function. */ | |
2137 | stop_print_frame = 1; | |
2138 | } | |
c906108c | 2139 | |
c5aa993b JM |
2140 | if (stop_signal == TARGET_SIGNAL_TRAP) |
2141 | ecs->random_signal | |
2142 | = !(bpstat_explains_signal (stop_bpstat) | |
2143 | || trap_expected | |
2144 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P | |
2145 | && PC_IN_CALL_DUMMY (stop_pc, read_sp (), | |
2146 | FRAME_FP (get_current_frame ()))) | |
2147 | || (step_range_end && step_resume_breakpoint == NULL)); | |
2148 | ||
2149 | else | |
2150 | { | |
cd0fc7c3 | 2151 | ecs->random_signal |
c906108c | 2152 | = !(bpstat_explains_signal (stop_bpstat) |
c5aa993b JM |
2153 | /* End of a stack dummy. Some systems (e.g. Sony |
2154 | news) give another signal besides SIGTRAP, so | |
2155 | check here as well as above. */ | |
7a292a7a SS |
2156 | || (!CALL_DUMMY_BREAKPOINT_OFFSET_P |
2157 | && PC_IN_CALL_DUMMY (stop_pc, read_sp (), | |
2158 | FRAME_FP (get_current_frame ()))) | |
c5aa993b JM |
2159 | ); |
2160 | if (!ecs->random_signal) | |
2161 | stop_signal = TARGET_SIGNAL_TRAP; | |
2162 | } | |
2163 | } | |
c906108c | 2164 | |
c5aa993b JM |
2165 | /* When we reach this point, we've pretty much decided |
2166 | that the reason for stopping must've been a random | |
2167 | (unexpected) signal. */ | |
2168 | ||
2169 | else | |
2170 | ecs->random_signal = 1; | |
2171 | /* If a fork, vfork or exec event was seen, then there are two | |
2172 | possible responses we can make: | |
2173 | ||
2174 | 1. If a catchpoint triggers for the event (ecs->random_signal == 0), | |
2175 | then we must stop now and issue a prompt. We will resume | |
2176 | the inferior when the user tells us to. | |
2177 | 2. If no catchpoint triggers for the event (ecs->random_signal == 1), | |
2178 | then we must resume the inferior now and keep checking. | |
2179 | ||
2180 | In either case, we must take appropriate steps to "follow" the | |
2181 | the fork/vfork/exec when the inferior is resumed. For example, | |
2182 | if follow-fork-mode is "child", then we must detach from the | |
2183 | parent inferior and follow the new child inferior. | |
2184 | ||
2185 | In either case, setting pending_follow causes the next resume() | |
2186 | to take the appropriate following action. */ | |
2187 | process_event_stop_test: | |
2188 | if (ecs->ws.kind == TARGET_WAITKIND_FORKED) | |
2189 | { | |
2190 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
2191 | { | |
2192 | trap_expected = 1; | |
2193 | stop_signal = TARGET_SIGNAL_0; | |
d4f3574e SS |
2194 | keep_going (ecs); |
2195 | return; | |
c5aa993b JM |
2196 | } |
2197 | } | |
2198 | else if (ecs->ws.kind == TARGET_WAITKIND_VFORKED) | |
2199 | { | |
2200 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
2201 | { | |
d4f3574e SS |
2202 | stop_signal = TARGET_SIGNAL_0; |
2203 | keep_going (ecs); | |
2204 | return; | |
c5aa993b JM |
2205 | } |
2206 | } | |
2207 | else if (ecs->ws.kind == TARGET_WAITKIND_EXECD) | |
2208 | { | |
2209 | pending_follow.kind = ecs->ws.kind; | |
2210 | if (ecs->random_signal) /* I.e., no catchpoint triggered for this. */ | |
2211 | { | |
2212 | trap_expected = 1; | |
2213 | stop_signal = TARGET_SIGNAL_0; | |
d4f3574e SS |
2214 | keep_going (ecs); |
2215 | return; | |
c5aa993b JM |
2216 | } |
2217 | } | |
c906108c | 2218 | |
c5aa993b JM |
2219 | /* For the program's own signals, act according to |
2220 | the signal handling tables. */ | |
c906108c | 2221 | |
c5aa993b JM |
2222 | if (ecs->random_signal) |
2223 | { | |
2224 | /* Signal not for debugging purposes. */ | |
2225 | int printed = 0; | |
2226 | ||
2227 | stopped_by_random_signal = 1; | |
2228 | ||
2229 | if (signal_print[stop_signal]) | |
2230 | { | |
2231 | printed = 1; | |
2232 | target_terminal_ours_for_output (); | |
11cf8741 | 2233 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); |
c5aa993b JM |
2234 | } |
2235 | if (signal_stop[stop_signal]) | |
104c1213 JM |
2236 | { |
2237 | stop_stepping (ecs); | |
2238 | return; | |
2239 | } | |
c5aa993b JM |
2240 | /* If not going to stop, give terminal back |
2241 | if we took it away. */ | |
2242 | else if (printed) | |
2243 | target_terminal_inferior (); | |
2244 | ||
2245 | /* Clear the signal if it should not be passed. */ | |
2246 | if (signal_program[stop_signal] == 0) | |
2247 | stop_signal = TARGET_SIGNAL_0; | |
2248 | ||
a0b3c4fd JM |
2249 | /* I'm not sure whether this needs to be check_sigtramp2 or |
2250 | whether it could/should be keep_going. | |
2251 | ||
2252 | This used to jump to step_over_function if we are stepping, | |
2253 | which is wrong. | |
2254 | ||
2255 | Suppose the user does a `next' over a function call, and while | |
2256 | that call is in progress, the inferior receives a signal for | |
2257 | which GDB does not stop (i.e., signal_stop[SIG] is false). In | |
2258 | that case, when we reach this point, there is already a | |
2259 | step-resume breakpoint established, right where it should be: | |
2260 | immediately after the function call the user is "next"-ing | |
d4f3574e | 2261 | over. If we call step_over_function now, two bad things |
a0b3c4fd JM |
2262 | happen: |
2263 | ||
2264 | - we'll create a new breakpoint, at wherever the current | |
2265 | frame's return address happens to be. That could be | |
2266 | anywhere, depending on what function call happens to be on | |
2267 | the top of the stack at that point. Point is, it's probably | |
2268 | not where we need it. | |
2269 | ||
2270 | - the existing step-resume breakpoint (which is at the correct | |
2271 | address) will get orphaned: step_resume_breakpoint will point | |
2272 | to the new breakpoint, and the old step-resume breakpoint | |
2273 | will never be cleaned up. | |
2274 | ||
2275 | The old behavior was meant to help HP-UX single-step out of | |
2276 | sigtramps. It would place the new breakpoint at prev_pc, which | |
2277 | was certainly wrong. I don't know the details there, so fixing | |
2278 | this probably breaks that. As with anything else, it's up to | |
2279 | the HP-UX maintainer to furnish a fix that doesn't break other | |
2280 | platforms. --JimB, 20 May 1999 */ | |
104c1213 | 2281 | check_sigtramp2 (ecs); |
e441088d MK |
2282 | keep_going (ecs); |
2283 | return; | |
c5aa993b JM |
2284 | } |
2285 | ||
2286 | /* Handle cases caused by hitting a breakpoint. */ | |
2287 | { | |
2288 | CORE_ADDR jmp_buf_pc; | |
2289 | struct bpstat_what what; | |
2290 | ||
2291 | what = bpstat_what (stop_bpstat); | |
2292 | ||
2293 | if (what.call_dummy) | |
c906108c | 2294 | { |
c5aa993b JM |
2295 | stop_stack_dummy = 1; |
2296 | #ifdef HP_OS_BUG | |
2297 | trap_expected_after_continue = 1; | |
2298 | #endif | |
c906108c | 2299 | } |
c5aa993b JM |
2300 | |
2301 | switch (what.main_action) | |
c906108c | 2302 | { |
c5aa993b JM |
2303 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
2304 | /* If we hit the breakpoint at longjmp, disable it for the | |
2305 | duration of this command. Then, install a temporary | |
2306 | breakpoint at the target of the jmp_buf. */ | |
2307 | disable_longjmp_breakpoint (); | |
2308 | remove_breakpoints (); | |
2309 | breakpoints_inserted = 0; | |
2310 | if (!GET_LONGJMP_TARGET (&jmp_buf_pc)) | |
d4f3574e SS |
2311 | { |
2312 | keep_going (ecs); | |
2313 | return; | |
2314 | } | |
c5aa993b JM |
2315 | |
2316 | /* Need to blow away step-resume breakpoint, as it | |
2317 | interferes with us */ | |
2318 | if (step_resume_breakpoint != NULL) | |
c906108c | 2319 | { |
c5aa993b JM |
2320 | delete_breakpoint (step_resume_breakpoint); |
2321 | step_resume_breakpoint = NULL; | |
c906108c | 2322 | } |
c5aa993b JM |
2323 | /* Not sure whether we need to blow this away too, but probably |
2324 | it is like the step-resume breakpoint. */ | |
2325 | if (through_sigtramp_breakpoint != NULL) | |
c906108c | 2326 | { |
c5aa993b JM |
2327 | delete_breakpoint (through_sigtramp_breakpoint); |
2328 | through_sigtramp_breakpoint = NULL; | |
c906108c | 2329 | } |
c906108c | 2330 | |
c5aa993b JM |
2331 | #if 0 |
2332 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2333 | if (step_over_calls > 0) | |
2334 | set_longjmp_resume_breakpoint (jmp_buf_pc, | |
2335 | get_current_frame ()); | |
2336 | else | |
2337 | #endif /* 0 */ | |
2338 | set_longjmp_resume_breakpoint (jmp_buf_pc, NULL); | |
2339 | ecs->handling_longjmp = 1; /* FIXME */ | |
d4f3574e SS |
2340 | keep_going (ecs); |
2341 | return; | |
c906108c | 2342 | |
c5aa993b JM |
2343 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
2344 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME_SINGLE: | |
2345 | remove_breakpoints (); | |
2346 | breakpoints_inserted = 0; | |
2347 | #if 0 | |
2348 | /* FIXME - Need to implement nested temporary breakpoints */ | |
2349 | if (step_over_calls | |
2350 | && (INNER_THAN (FRAME_FP (get_current_frame ()), | |
2351 | step_frame_address))) | |
2352 | { | |
2353 | ecs->another_trap = 1; | |
d4f3574e SS |
2354 | keep_going (ecs); |
2355 | return; | |
c5aa993b JM |
2356 | } |
2357 | #endif /* 0 */ | |
2358 | disable_longjmp_breakpoint (); | |
2359 | ecs->handling_longjmp = 0; /* FIXME */ | |
2360 | if (what.main_action == BPSTAT_WHAT_CLEAR_LONGJMP_RESUME) | |
2361 | break; | |
2362 | /* else fallthrough */ | |
c906108c | 2363 | |
c5aa993b JM |
2364 | case BPSTAT_WHAT_SINGLE: |
2365 | if (breakpoints_inserted) | |
c906108c | 2366 | { |
c5aa993b JM |
2367 | thread_step_needed = 1; |
2368 | remove_breakpoints (); | |
c906108c | 2369 | } |
c5aa993b JM |
2370 | breakpoints_inserted = 0; |
2371 | ecs->another_trap = 1; | |
2372 | /* Still need to check other stuff, at least the case | |
2373 | where we are stepping and step out of the right range. */ | |
2374 | break; | |
c906108c | 2375 | |
c5aa993b JM |
2376 | case BPSTAT_WHAT_STOP_NOISY: |
2377 | stop_print_frame = 1; | |
c906108c | 2378 | |
c5aa993b JM |
2379 | /* We are about to nuke the step_resume_breakpoint and |
2380 | through_sigtramp_breakpoint via the cleanup chain, so | |
2381 | no need to worry about it here. */ | |
c906108c | 2382 | |
104c1213 JM |
2383 | stop_stepping (ecs); |
2384 | return; | |
c906108c | 2385 | |
c5aa993b JM |
2386 | case BPSTAT_WHAT_STOP_SILENT: |
2387 | stop_print_frame = 0; | |
c906108c | 2388 | |
c5aa993b JM |
2389 | /* We are about to nuke the step_resume_breakpoint and |
2390 | through_sigtramp_breakpoint via the cleanup chain, so | |
2391 | no need to worry about it here. */ | |
c906108c | 2392 | |
104c1213 JM |
2393 | stop_stepping (ecs); |
2394 | return; | |
c906108c | 2395 | |
c5aa993b JM |
2396 | case BPSTAT_WHAT_STEP_RESUME: |
2397 | /* This proably demands a more elegant solution, but, yeah | |
2398 | right... | |
2399 | ||
2400 | This function's use of the simple variable | |
2401 | step_resume_breakpoint doesn't seem to accomodate | |
2402 | simultaneously active step-resume bp's, although the | |
2403 | breakpoint list certainly can. | |
2404 | ||
2405 | If we reach here and step_resume_breakpoint is already | |
2406 | NULL, then apparently we have multiple active | |
2407 | step-resume bp's. We'll just delete the breakpoint we | |
53a5351d JM |
2408 | stopped at, and carry on. |
2409 | ||
2410 | Correction: what the code currently does is delete a | |
2411 | step-resume bp, but it makes no effort to ensure that | |
2412 | the one deleted is the one currently stopped at. MVS */ | |
2413 | ||
c5aa993b JM |
2414 | if (step_resume_breakpoint == NULL) |
2415 | { | |
2416 | step_resume_breakpoint = | |
2417 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2418 | } | |
2419 | delete_breakpoint (step_resume_breakpoint); | |
2420 | step_resume_breakpoint = NULL; | |
2421 | break; | |
2422 | ||
2423 | case BPSTAT_WHAT_THROUGH_SIGTRAMP: | |
2424 | if (through_sigtramp_breakpoint) | |
2425 | delete_breakpoint (through_sigtramp_breakpoint); | |
2426 | through_sigtramp_breakpoint = NULL; | |
2427 | ||
2428 | /* If were waiting for a trap, hitting the step_resume_break | |
2429 | doesn't count as getting it. */ | |
2430 | if (trap_expected) | |
2431 | ecs->another_trap = 1; | |
2432 | break; | |
c906108c | 2433 | |
c5aa993b JM |
2434 | case BPSTAT_WHAT_CHECK_SHLIBS: |
2435 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
2436 | #ifdef SOLIB_ADD | |
c906108c | 2437 | { |
c5aa993b JM |
2438 | /* Remove breakpoints, we eventually want to step over the |
2439 | shlib event breakpoint, and SOLIB_ADD might adjust | |
2440 | breakpoint addresses via breakpoint_re_set. */ | |
2441 | if (breakpoints_inserted) | |
2442 | remove_breakpoints (); | |
c906108c | 2443 | breakpoints_inserted = 0; |
c906108c | 2444 | |
c5aa993b JM |
2445 | /* Check for any newly added shared libraries if we're |
2446 | supposed to be adding them automatically. */ | |
2447 | if (auto_solib_add) | |
c906108c | 2448 | { |
c5aa993b JM |
2449 | /* Switch terminal for any messages produced by |
2450 | breakpoint_re_set. */ | |
2451 | target_terminal_ours_for_output (); | |
2452 | SOLIB_ADD (NULL, 0, NULL); | |
2453 | target_terminal_inferior (); | |
c906108c | 2454 | } |
c5aa993b JM |
2455 | |
2456 | /* Try to reenable shared library breakpoints, additional | |
2457 | code segments in shared libraries might be mapped in now. */ | |
2458 | re_enable_breakpoints_in_shlibs (); | |
2459 | ||
2460 | /* If requested, stop when the dynamic linker notifies | |
2461 | gdb of events. This allows the user to get control | |
2462 | and place breakpoints in initializer routines for | |
2463 | dynamically loaded objects (among other things). */ | |
2464 | if (stop_on_solib_events) | |
c906108c | 2465 | { |
104c1213 JM |
2466 | stop_stepping (ecs); |
2467 | return; | |
c906108c SS |
2468 | } |
2469 | ||
c5aa993b JM |
2470 | /* If we stopped due to an explicit catchpoint, then the |
2471 | (see above) call to SOLIB_ADD pulled in any symbols | |
2472 | from a newly-loaded library, if appropriate. | |
2473 | ||
2474 | We do want the inferior to stop, but not where it is | |
2475 | now, which is in the dynamic linker callback. Rather, | |
2476 | we would like it stop in the user's program, just after | |
2477 | the call that caused this catchpoint to trigger. That | |
2478 | gives the user a more useful vantage from which to | |
2479 | examine their program's state. */ | |
2480 | else if (what.main_action == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
2481 | { | |
2482 | /* ??rehrauer: If I could figure out how to get the | |
2483 | right return PC from here, we could just set a temp | |
2484 | breakpoint and resume. I'm not sure we can without | |
2485 | cracking open the dld's shared libraries and sniffing | |
2486 | their unwind tables and text/data ranges, and that's | |
2487 | not a terribly portable notion. | |
2488 | ||
2489 | Until that time, we must step the inferior out of the | |
2490 | dld callback, and also out of the dld itself (and any | |
2491 | code or stubs in libdld.sl, such as "shl_load" and | |
2492 | friends) until we reach non-dld code. At that point, | |
2493 | we can stop stepping. */ | |
2494 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
2495 | &ecs->stepping_through_solib_catchpoints); | |
2496 | ecs->stepping_through_solib_after_catch = 1; | |
2497 | ||
2498 | /* Be sure to lift all breakpoints, so the inferior does | |
2499 | actually step past this point... */ | |
2500 | ecs->another_trap = 1; | |
2501 | break; | |
2502 | } | |
2503 | else | |
c906108c | 2504 | { |
c5aa993b | 2505 | /* We want to step over this breakpoint, then keep going. */ |
cd0fc7c3 | 2506 | ecs->another_trap = 1; |
c5aa993b | 2507 | break; |
c906108c | 2508 | } |
c5aa993b JM |
2509 | } |
2510 | #endif | |
2511 | break; | |
c906108c | 2512 | |
c5aa993b JM |
2513 | case BPSTAT_WHAT_LAST: |
2514 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2515 | |
c5aa993b JM |
2516 | case BPSTAT_WHAT_KEEP_CHECKING: |
2517 | break; | |
2518 | } | |
2519 | } | |
c906108c | 2520 | |
c5aa993b JM |
2521 | /* We come here if we hit a breakpoint but should not |
2522 | stop for it. Possibly we also were stepping | |
2523 | and should stop for that. So fall through and | |
2524 | test for stepping. But, if not stepping, | |
2525 | do not stop. */ | |
c906108c | 2526 | |
c5aa993b JM |
2527 | /* Are we stepping to get the inferior out of the dynamic |
2528 | linker's hook (and possibly the dld itself) after catching | |
2529 | a shlib event? */ | |
2530 | if (ecs->stepping_through_solib_after_catch) | |
2531 | { | |
2532 | #if defined(SOLIB_ADD) | |
2533 | /* Have we reached our destination? If not, keep going. */ | |
2534 | if (SOLIB_IN_DYNAMIC_LINKER (ecs->pid, stop_pc)) | |
2535 | { | |
2536 | ecs->another_trap = 1; | |
d4f3574e SS |
2537 | keep_going (ecs); |
2538 | return; | |
c5aa993b JM |
2539 | } |
2540 | #endif | |
2541 | /* Else, stop and report the catchpoint(s) whose triggering | |
2542 | caused us to begin stepping. */ | |
2543 | ecs->stepping_through_solib_after_catch = 0; | |
2544 | bpstat_clear (&stop_bpstat); | |
2545 | stop_bpstat = bpstat_copy (ecs->stepping_through_solib_catchpoints); | |
2546 | bpstat_clear (&ecs->stepping_through_solib_catchpoints); | |
2547 | stop_print_frame = 1; | |
104c1213 JM |
2548 | stop_stepping (ecs); |
2549 | return; | |
c5aa993b | 2550 | } |
c906108c | 2551 | |
c5aa993b JM |
2552 | if (!CALL_DUMMY_BREAKPOINT_OFFSET_P) |
2553 | { | |
2554 | /* This is the old way of detecting the end of the stack dummy. | |
2555 | An architecture which defines CALL_DUMMY_BREAKPOINT_OFFSET gets | |
2556 | handled above. As soon as we can test it on all of them, all | |
2557 | architectures should define it. */ | |
2558 | ||
2559 | /* If this is the breakpoint at the end of a stack dummy, | |
2560 | just stop silently, unless the user was doing an si/ni, in which | |
2561 | case she'd better know what she's doing. */ | |
2562 | ||
2563 | if (CALL_DUMMY_HAS_COMPLETED (stop_pc, read_sp (), | |
2564 | FRAME_FP (get_current_frame ())) | |
2565 | && !step_range_end) | |
2566 | { | |
c906108c | 2567 | stop_print_frame = 0; |
c5aa993b JM |
2568 | stop_stack_dummy = 1; |
2569 | #ifdef HP_OS_BUG | |
2570 | trap_expected_after_continue = 1; | |
2571 | #endif | |
104c1213 JM |
2572 | stop_stepping (ecs); |
2573 | return; | |
c5aa993b JM |
2574 | } |
2575 | } | |
c906108c | 2576 | |
c5aa993b | 2577 | if (step_resume_breakpoint) |
104c1213 JM |
2578 | { |
2579 | /* Having a step-resume breakpoint overrides anything | |
2580 | else having to do with stepping commands until | |
2581 | that breakpoint is reached. */ | |
2582 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2583 | whether it could/should be keep_going. */ | |
2584 | check_sigtramp2 (ecs); | |
d4f3574e SS |
2585 | keep_going (ecs); |
2586 | return; | |
104c1213 JM |
2587 | } |
2588 | ||
c5aa993b | 2589 | if (step_range_end == 0) |
104c1213 JM |
2590 | { |
2591 | /* Likewise if we aren't even stepping. */ | |
2592 | /* I'm not sure whether this needs to be check_sigtramp2 or | |
2593 | whether it could/should be keep_going. */ | |
2594 | check_sigtramp2 (ecs); | |
d4f3574e SS |
2595 | keep_going (ecs); |
2596 | return; | |
104c1213 | 2597 | } |
c5aa993b JM |
2598 | |
2599 | /* If stepping through a line, keep going if still within it. | |
2600 | ||
2601 | Note that step_range_end is the address of the first instruction | |
2602 | beyond the step range, and NOT the address of the last instruction | |
2603 | within it! */ | |
2604 | if (stop_pc >= step_range_start | |
2605 | && stop_pc < step_range_end) | |
2606 | { | |
2607 | /* We might be doing a BPSTAT_WHAT_SINGLE and getting a signal. | |
2608 | So definately need to check for sigtramp here. */ | |
104c1213 | 2609 | check_sigtramp2 (ecs); |
d4f3574e SS |
2610 | keep_going (ecs); |
2611 | return; | |
c5aa993b | 2612 | } |
c906108c | 2613 | |
c5aa993b | 2614 | /* We stepped out of the stepping range. */ |
c906108c | 2615 | |
c5aa993b JM |
2616 | /* If we are stepping at the source level and entered the runtime |
2617 | loader dynamic symbol resolution code, we keep on single stepping | |
2618 | until we exit the run time loader code and reach the callee's | |
2619 | address. */ | |
5fbbeb29 | 2620 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && IN_SOLIB_DYNSYM_RESOLVE_CODE (stop_pc)) |
d4f3574e SS |
2621 | { |
2622 | CORE_ADDR pc_after_resolver = SKIP_SOLIB_RESOLVER (stop_pc); | |
2623 | ||
2624 | if (pc_after_resolver) | |
2625 | { | |
2626 | /* Set up a step-resume breakpoint at the address | |
2627 | indicated by SKIP_SOLIB_RESOLVER. */ | |
2628 | struct symtab_and_line sr_sal; | |
2629 | INIT_SAL (&sr_sal); | |
2630 | sr_sal.pc = pc_after_resolver; | |
2631 | ||
2632 | check_for_old_step_resume_breakpoint (); | |
2633 | step_resume_breakpoint = | |
2634 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2635 | if (breakpoints_inserted) | |
2636 | insert_breakpoints (); | |
2637 | } | |
2638 | ||
2639 | keep_going (ecs); | |
2640 | return; | |
2641 | } | |
c906108c | 2642 | |
c5aa993b JM |
2643 | /* We can't update step_sp every time through the loop, because |
2644 | reading the stack pointer would slow down stepping too much. | |
2645 | But we can update it every time we leave the step range. */ | |
2646 | ecs->update_step_sp = 1; | |
c906108c | 2647 | |
c5aa993b JM |
2648 | /* Did we just take a signal? */ |
2649 | if (IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
2650 | && !IN_SIGTRAMP (prev_pc, prev_func_name) | |
2651 | && INNER_THAN (read_sp (), step_sp)) | |
2652 | { | |
2653 | /* We've just taken a signal; go until we are back to | |
2654 | the point where we took it and one more. */ | |
c906108c | 2655 | |
c5aa993b JM |
2656 | /* Note: The test above succeeds not only when we stepped |
2657 | into a signal handler, but also when we step past the last | |
2658 | statement of a signal handler and end up in the return stub | |
2659 | of the signal handler trampoline. To distinguish between | |
2660 | these two cases, check that the frame is INNER_THAN the | |
2661 | previous one below. pai/1997-09-11 */ | |
c906108c | 2662 | |
c906108c | 2663 | |
c5aa993b JM |
2664 | { |
2665 | CORE_ADDR current_frame = FRAME_FP (get_current_frame ()); | |
c906108c | 2666 | |
c5aa993b JM |
2667 | if (INNER_THAN (current_frame, step_frame_address)) |
2668 | { | |
2669 | /* We have just taken a signal; go until we are back to | |
2670 | the point where we took it and one more. */ | |
c906108c | 2671 | |
c5aa993b JM |
2672 | /* This code is needed at least in the following case: |
2673 | The user types "next" and then a signal arrives (before | |
2674 | the "next" is done). */ | |
c906108c | 2675 | |
c5aa993b JM |
2676 | /* Note that if we are stopped at a breakpoint, then we need |
2677 | the step_resume breakpoint to override any breakpoints at | |
2678 | the same location, so that we will still step over the | |
2679 | breakpoint even though the signal happened. */ | |
2680 | struct symtab_and_line sr_sal; | |
c906108c | 2681 | |
c5aa993b JM |
2682 | INIT_SAL (&sr_sal); |
2683 | sr_sal.symtab = NULL; | |
2684 | sr_sal.line = 0; | |
2685 | sr_sal.pc = prev_pc; | |
2686 | /* We could probably be setting the frame to | |
2687 | step_frame_address; I don't think anyone thought to | |
2688 | try it. */ | |
a0b3c4fd | 2689 | check_for_old_step_resume_breakpoint (); |
c5aa993b JM |
2690 | step_resume_breakpoint = |
2691 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2692 | if (breakpoints_inserted) | |
2693 | insert_breakpoints (); | |
c906108c | 2694 | } |
c5aa993b | 2695 | else |
c906108c | 2696 | { |
c5aa993b JM |
2697 | /* We just stepped out of a signal handler and into |
2698 | its calling trampoline. | |
2699 | ||
d4f3574e | 2700 | Normally, we'd call step_over_function from |
c5aa993b JM |
2701 | here, but for some reason GDB can't unwind the |
2702 | stack correctly to find the real PC for the point | |
2703 | user code where the signal trampoline will return | |
2704 | -- FRAME_SAVED_PC fails, at least on HP-UX 10.20. | |
2705 | But signal trampolines are pretty small stubs of | |
2706 | code, anyway, so it's OK instead to just | |
2707 | single-step out. Note: assuming such trampolines | |
2708 | don't exhibit recursion on any platform... */ | |
2709 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
2710 | &ecs->stop_func_start, | |
2711 | &ecs->stop_func_end); | |
2712 | /* Readjust stepping range */ | |
2713 | step_range_start = ecs->stop_func_start; | |
2714 | step_range_end = ecs->stop_func_end; | |
2715 | ecs->stepping_through_sigtramp = 1; | |
c906108c | 2716 | } |
c906108c SS |
2717 | } |
2718 | ||
c906108c | 2719 | |
c5aa993b JM |
2720 | /* If this is stepi or nexti, make sure that the stepping range |
2721 | gets us past that instruction. */ | |
2722 | if (step_range_end == 1) | |
2723 | /* FIXME: Does this run afoul of the code below which, if | |
2724 | we step into the middle of a line, resets the stepping | |
2725 | range? */ | |
2726 | step_range_end = (step_range_start = prev_pc) + 1; | |
c906108c | 2727 | |
c5aa993b | 2728 | ecs->remove_breakpoints_on_following_step = 1; |
d4f3574e SS |
2729 | keep_going (ecs); |
2730 | return; | |
c5aa993b | 2731 | } |
c906108c | 2732 | |
c5aa993b JM |
2733 | if (stop_pc == ecs->stop_func_start /* Quick test */ |
2734 | || (in_prologue (stop_pc, ecs->stop_func_start) && | |
2735 | !IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2736 | || IN_SOLIB_CALL_TRAMPOLINE (stop_pc, ecs->stop_func_name) | |
2737 | || ecs->stop_func_name == 0) | |
2738 | { | |
2739 | /* It's a subroutine call. */ | |
c906108c | 2740 | |
5fbbeb29 | 2741 | if (step_over_calls == STEP_OVER_NONE) |
c906108c | 2742 | { |
c5aa993b JM |
2743 | /* I presume that step_over_calls is only 0 when we're |
2744 | supposed to be stepping at the assembly language level | |
2745 | ("stepi"). Just stop. */ | |
2746 | stop_step = 1; | |
11cf8741 | 2747 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2748 | stop_stepping (ecs); |
2749 | return; | |
c5aa993b | 2750 | } |
c906108c | 2751 | |
5fbbeb29 | 2752 | if (step_over_calls == STEP_OVER_ALL || IGNORE_HELPER_CALL (stop_pc)) |
d4f3574e SS |
2753 | { |
2754 | /* We're doing a "next". */ | |
d41707c8 MK |
2755 | |
2756 | if (IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
2757 | && INNER_THAN (step_frame_address, read_sp())) | |
2758 | /* We stepped out of a signal handler, and into its | |
2759 | calling trampoline. This is misdetected as a | |
2760 | subroutine call, but stepping over the signal | |
2761 | trampoline isn't such a bad idea. In order to do | |
2762 | that, we have to ignore the value in | |
2763 | step_frame_address, since that doesn't represent the | |
2764 | frame that'll reach when we return from the signal | |
2765 | trampoline. Otherwise we'll probably continue to the | |
2766 | end of the program. */ | |
2767 | step_frame_address = 0; | |
2768 | ||
d4f3574e SS |
2769 | step_over_function (ecs); |
2770 | keep_going (ecs); | |
2771 | return; | |
2772 | } | |
c5aa993b JM |
2773 | |
2774 | /* If we are in a function call trampoline (a stub between | |
2775 | the calling routine and the real function), locate the real | |
2776 | function. That's what tells us (a) whether we want to step | |
2777 | into it at all, and (b) what prologue we want to run to | |
2778 | the end of, if we do step into it. */ | |
2779 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
2780 | if (tmp != 0) | |
2781 | ecs->stop_func_start = tmp; | |
2782 | else | |
2783 | { | |
2784 | tmp = DYNAMIC_TRAMPOLINE_NEXTPC (stop_pc); | |
2785 | if (tmp) | |
c906108c | 2786 | { |
c5aa993b JM |
2787 | struct symtab_and_line xxx; |
2788 | /* Why isn't this s_a_l called "sr_sal", like all of the | |
2789 | other s_a_l's where this code is duplicated? */ | |
2790 | INIT_SAL (&xxx); /* initialize to zeroes */ | |
2791 | xxx.pc = tmp; | |
2792 | xxx.section = find_pc_overlay (xxx.pc); | |
a0b3c4fd | 2793 | check_for_old_step_resume_breakpoint (); |
c906108c | 2794 | step_resume_breakpoint = |
c5aa993b JM |
2795 | set_momentary_breakpoint (xxx, NULL, bp_step_resume); |
2796 | insert_breakpoints (); | |
d4f3574e SS |
2797 | keep_going (ecs); |
2798 | return; | |
c906108c SS |
2799 | } |
2800 | } | |
2801 | ||
c5aa993b JM |
2802 | /* If we have line number information for the function we |
2803 | are thinking of stepping into, step into it. | |
c906108c | 2804 | |
c5aa993b JM |
2805 | If there are several symtabs at that PC (e.g. with include |
2806 | files), just want to know whether *any* of them have line | |
2807 | numbers. find_pc_line handles this. */ | |
2808 | { | |
2809 | struct symtab_and_line tmp_sal; | |
c906108c | 2810 | |
c5aa993b JM |
2811 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
2812 | if (tmp_sal.line != 0) | |
c2c6d25f JM |
2813 | { |
2814 | step_into_function (ecs); | |
2815 | return; | |
2816 | } | |
c906108c | 2817 | } |
5fbbeb29 CF |
2818 | |
2819 | /* If we have no line number and the step-stop-if-no-debug | |
2820 | is set, we stop the step so that the user has a chance to | |
2821 | switch in assembly mode. */ | |
2822 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) | |
2823 | { | |
2824 | stop_step = 1; | |
2825 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2826 | stop_stepping (ecs); | |
2827 | return; | |
2828 | } | |
2829 | ||
d4f3574e SS |
2830 | step_over_function (ecs); |
2831 | keep_going (ecs); | |
2832 | return; | |
c906108c | 2833 | |
c5aa993b | 2834 | } |
c906108c | 2835 | |
c5aa993b | 2836 | /* We've wandered out of the step range. */ |
c906108c | 2837 | |
c5aa993b | 2838 | ecs->sal = find_pc_line (stop_pc, 0); |
c906108c | 2839 | |
c5aa993b JM |
2840 | if (step_range_end == 1) |
2841 | { | |
2842 | /* It is stepi or nexti. We always want to stop stepping after | |
2843 | one instruction. */ | |
2844 | stop_step = 1; | |
11cf8741 | 2845 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2846 | stop_stepping (ecs); |
2847 | return; | |
c5aa993b | 2848 | } |
c906108c | 2849 | |
c5aa993b JM |
2850 | /* If we're in the return path from a shared library trampoline, |
2851 | we want to proceed through the trampoline when stepping. */ | |
2852 | if (IN_SOLIB_RETURN_TRAMPOLINE (stop_pc, ecs->stop_func_name)) | |
2853 | { | |
2854 | CORE_ADDR tmp; | |
c906108c | 2855 | |
c5aa993b JM |
2856 | /* Determine where this trampoline returns. */ |
2857 | tmp = SKIP_TRAMPOLINE_CODE (stop_pc); | |
c906108c | 2858 | |
c5aa993b JM |
2859 | /* Only proceed through if we know where it's going. */ |
2860 | if (tmp) | |
2861 | { | |
2862 | /* And put the step-breakpoint there and go until there. */ | |
2863 | struct symtab_and_line sr_sal; | |
c906108c | 2864 | |
c5aa993b JM |
2865 | INIT_SAL (&sr_sal); /* initialize to zeroes */ |
2866 | sr_sal.pc = tmp; | |
2867 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2868 | /* Do not specify what the fp should be when we stop | |
2869 | since on some machines the prologue | |
2870 | is where the new fp value is established. */ | |
a0b3c4fd | 2871 | check_for_old_step_resume_breakpoint (); |
c5aa993b JM |
2872 | step_resume_breakpoint = |
2873 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
2874 | if (breakpoints_inserted) | |
2875 | insert_breakpoints (); | |
c906108c | 2876 | |
c5aa993b JM |
2877 | /* Restart without fiddling with the step ranges or |
2878 | other state. */ | |
d4f3574e SS |
2879 | keep_going (ecs); |
2880 | return; | |
c5aa993b JM |
2881 | } |
2882 | } | |
c906108c | 2883 | |
c5aa993b | 2884 | if (ecs->sal.line == 0) |
c906108c | 2885 | { |
c5aa993b JM |
2886 | /* We have no line number information. That means to stop |
2887 | stepping (does this always happen right after one instruction, | |
2888 | when we do "s" in a function with no line numbers, | |
2889 | or can this happen as a result of a return or longjmp?). */ | |
2890 | stop_step = 1; | |
11cf8741 | 2891 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2892 | stop_stepping (ecs); |
2893 | return; | |
c906108c SS |
2894 | } |
2895 | ||
c5aa993b JM |
2896 | if ((stop_pc == ecs->sal.pc) |
2897 | && (ecs->current_line != ecs->sal.line || ecs->current_symtab != ecs->sal.symtab)) | |
2898 | { | |
2899 | /* We are at the start of a different line. So stop. Note that | |
2900 | we don't stop if we step into the middle of a different line. | |
2901 | That is said to make things like for (;;) statements work | |
2902 | better. */ | |
2903 | stop_step = 1; | |
11cf8741 | 2904 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2905 | stop_stepping (ecs); |
2906 | return; | |
c5aa993b | 2907 | } |
c906108c | 2908 | |
c5aa993b | 2909 | /* We aren't done stepping. |
c906108c | 2910 | |
c5aa993b JM |
2911 | Optimize by setting the stepping range to the line. |
2912 | (We might not be in the original line, but if we entered a | |
2913 | new line in mid-statement, we continue stepping. This makes | |
2914 | things like for(;;) statements work better.) */ | |
c906108c | 2915 | |
c5aa993b JM |
2916 | if (ecs->stop_func_end && ecs->sal.end >= ecs->stop_func_end) |
2917 | { | |
2918 | /* If this is the last line of the function, don't keep stepping | |
2919 | (it would probably step us out of the function). | |
2920 | This is particularly necessary for a one-line function, | |
2921 | in which after skipping the prologue we better stop even though | |
2922 | we will be in mid-line. */ | |
2923 | stop_step = 1; | |
11cf8741 | 2924 | print_stop_reason (END_STEPPING_RANGE, 0); |
104c1213 JM |
2925 | stop_stepping (ecs); |
2926 | return; | |
c5aa993b JM |
2927 | } |
2928 | step_range_start = ecs->sal.pc; | |
2929 | step_range_end = ecs->sal.end; | |
2930 | step_frame_address = FRAME_FP (get_current_frame ()); | |
2931 | ecs->current_line = ecs->sal.line; | |
2932 | ecs->current_symtab = ecs->sal.symtab; | |
2933 | ||
2934 | /* In the case where we just stepped out of a function into the middle | |
2935 | of a line of the caller, continue stepping, but step_frame_address | |
2936 | must be modified to current frame */ | |
2937 | { | |
2938 | CORE_ADDR current_frame = FRAME_FP (get_current_frame ()); | |
2939 | if (!(INNER_THAN (current_frame, step_frame_address))) | |
2940 | step_frame_address = current_frame; | |
2941 | } | |
c906108c | 2942 | |
d4f3574e | 2943 | keep_going (ecs); |
cd0fc7c3 | 2944 | |
104c1213 | 2945 | } /* extra brace, to preserve old indentation */ |
104c1213 JM |
2946 | } |
2947 | ||
2948 | /* Are we in the middle of stepping? */ | |
2949 | ||
2950 | static int | |
2951 | currently_stepping (struct execution_control_state *ecs) | |
2952 | { | |
2953 | return ((through_sigtramp_breakpoint == NULL | |
2954 | && !ecs->handling_longjmp | |
2955 | && ((step_range_end && step_resume_breakpoint == NULL) | |
2956 | || trap_expected)) | |
2957 | || ecs->stepping_through_solib_after_catch | |
2958 | || bpstat_should_step ()); | |
2959 | } | |
c906108c | 2960 | |
104c1213 JM |
2961 | static void |
2962 | check_sigtramp2 (struct execution_control_state *ecs) | |
2963 | { | |
2964 | if (trap_expected | |
2965 | && IN_SIGTRAMP (stop_pc, ecs->stop_func_name) | |
2966 | && !IN_SIGTRAMP (prev_pc, prev_func_name) | |
2967 | && INNER_THAN (read_sp (), step_sp)) | |
2968 | { | |
2969 | /* What has happened here is that we have just stepped the | |
2970 | inferior with a signal (because it is a signal which | |
2971 | shouldn't make us stop), thus stepping into sigtramp. | |
2972 | ||
2973 | So we need to set a step_resume_break_address breakpoint and | |
2974 | continue until we hit it, and then step. FIXME: This should | |
2975 | be more enduring than a step_resume breakpoint; we should | |
2976 | know that we will later need to keep going rather than | |
2977 | re-hitting the breakpoint here (see the testsuite, | |
2978 | gdb.base/signals.exp where it says "exceedingly difficult"). */ | |
2979 | ||
2980 | struct symtab_and_line sr_sal; | |
2981 | ||
2982 | INIT_SAL (&sr_sal); /* initialize to zeroes */ | |
2983 | sr_sal.pc = prev_pc; | |
2984 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
2985 | /* We perhaps could set the frame if we kept track of what the | |
2986 | frame corresponding to prev_pc was. But we don't, so don't. */ | |
2987 | through_sigtramp_breakpoint = | |
2988 | set_momentary_breakpoint (sr_sal, NULL, bp_through_sigtramp); | |
2989 | if (breakpoints_inserted) | |
2990 | insert_breakpoints (); | |
cd0fc7c3 | 2991 | |
104c1213 JM |
2992 | ecs->remove_breakpoints_on_following_step = 1; |
2993 | ecs->another_trap = 1; | |
2994 | } | |
2995 | } | |
2996 | ||
c2c6d25f JM |
2997 | /* Subroutine call with source code we should not step over. Do step |
2998 | to the first line of code in it. */ | |
2999 | ||
3000 | static void | |
3001 | step_into_function (struct execution_control_state *ecs) | |
3002 | { | |
3003 | struct symtab *s; | |
3004 | struct symtab_and_line sr_sal; | |
3005 | ||
3006 | s = find_pc_symtab (stop_pc); | |
3007 | if (s && s->language != language_asm) | |
3008 | ecs->stop_func_start = SKIP_PROLOGUE (ecs->stop_func_start); | |
3009 | ||
3010 | ecs->sal = find_pc_line (ecs->stop_func_start, 0); | |
3011 | /* Use the step_resume_break to step until the end of the prologue, | |
3012 | even if that involves jumps (as it seems to on the vax under | |
3013 | 4.2). */ | |
3014 | /* If the prologue ends in the middle of a source line, continue to | |
3015 | the end of that source line (if it is still within the function). | |
3016 | Otherwise, just go to end of prologue. */ | |
3017 | #ifdef PROLOGUE_FIRSTLINE_OVERLAP | |
3018 | /* no, don't either. It skips any code that's legitimately on the | |
3019 | first line. */ | |
3020 | #else | |
3021 | if (ecs->sal.end | |
3022 | && ecs->sal.pc != ecs->stop_func_start | |
3023 | && ecs->sal.end < ecs->stop_func_end) | |
3024 | ecs->stop_func_start = ecs->sal.end; | |
3025 | #endif | |
3026 | ||
3027 | if (ecs->stop_func_start == stop_pc) | |
3028 | { | |
3029 | /* We are already there: stop now. */ | |
3030 | stop_step = 1; | |
11cf8741 | 3031 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
3032 | stop_stepping (ecs); |
3033 | return; | |
3034 | } | |
3035 | else | |
3036 | { | |
3037 | /* Put the step-breakpoint there and go until there. */ | |
3038 | INIT_SAL (&sr_sal); /* initialize to zeroes */ | |
3039 | sr_sal.pc = ecs->stop_func_start; | |
3040 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
3041 | /* Do not specify what the fp should be when we stop since on | |
3042 | some machines the prologue is where the new fp value is | |
3043 | established. */ | |
3044 | check_for_old_step_resume_breakpoint (); | |
3045 | step_resume_breakpoint = | |
3046 | set_momentary_breakpoint (sr_sal, NULL, bp_step_resume); | |
3047 | if (breakpoints_inserted) | |
3048 | insert_breakpoints (); | |
3049 | ||
3050 | /* And make sure stepping stops right away then. */ | |
3051 | step_range_end = step_range_start; | |
3052 | } | |
3053 | keep_going (ecs); | |
3054 | } | |
d4f3574e SS |
3055 | |
3056 | /* We've just entered a callee, and we wish to resume until it returns | |
3057 | to the caller. Setting a step_resume breakpoint on the return | |
3058 | address will catch a return from the callee. | |
3059 | ||
3060 | However, if the callee is recursing, we want to be careful not to | |
3061 | catch returns of those recursive calls, but only of THIS instance | |
3062 | of the call. | |
3063 | ||
3064 | To do this, we set the step_resume bp's frame to our current | |
3065 | caller's frame (step_frame_address, which is set by the "next" or | |
3066 | "until" command, before execution begins). */ | |
3067 | ||
3068 | static void | |
3069 | step_over_function (struct execution_control_state *ecs) | |
3070 | { | |
3071 | struct symtab_and_line sr_sal; | |
3072 | ||
3073 | INIT_SAL (&sr_sal); /* initialize to zeros */ | |
3074 | sr_sal.pc = ADDR_BITS_REMOVE (SAVED_PC_AFTER_CALL (get_current_frame ())); | |
3075 | sr_sal.section = find_pc_overlay (sr_sal.pc); | |
3076 | ||
3077 | check_for_old_step_resume_breakpoint (); | |
3078 | step_resume_breakpoint = | |
3079 | set_momentary_breakpoint (sr_sal, get_current_frame (), bp_step_resume); | |
3080 | ||
d41707c8 | 3081 | if (step_frame_address && !IN_SOLIB_DYNSYM_RESOLVE_CODE (sr_sal.pc)) |
d4f3574e SS |
3082 | step_resume_breakpoint->frame = step_frame_address; |
3083 | ||
3084 | if (breakpoints_inserted) | |
3085 | insert_breakpoints (); | |
3086 | } | |
3087 | ||
104c1213 JM |
3088 | static void |
3089 | stop_stepping (struct execution_control_state *ecs) | |
3090 | { | |
c906108c SS |
3091 | if (target_has_execution) |
3092 | { | |
3093 | /* Are we stopping for a vfork event? We only stop when we see | |
3094 | the child's event. However, we may not yet have seen the | |
104c1213 JM |
3095 | parent's event. And, inferior_pid is still set to the |
3096 | parent's pid, until we resume again and follow either the | |
3097 | parent or child. | |
c906108c SS |
3098 | |
3099 | To ensure that we can really touch inferior_pid (aka, the | |
3100 | parent process) -- which calls to functions like read_pc | |
3101 | implicitly do -- wait on the parent if necessary. */ | |
3102 | if ((pending_follow.kind == TARGET_WAITKIND_VFORKED) | |
3103 | && !pending_follow.fork_event.saw_parent_fork) | |
3104 | { | |
3105 | int parent_pid; | |
3106 | ||
3107 | do | |
3108 | { | |
3109 | if (target_wait_hook) | |
cd0fc7c3 | 3110 | parent_pid = target_wait_hook (-1, &(ecs->ws)); |
c906108c | 3111 | else |
cd0fc7c3 | 3112 | parent_pid = target_wait (-1, &(ecs->ws)); |
c906108c SS |
3113 | } |
3114 | while (parent_pid != inferior_pid); | |
3115 | } | |
3116 | ||
c906108c | 3117 | /* Assuming the inferior still exists, set these up for next |
c5aa993b JM |
3118 | time, just like we did above if we didn't break out of the |
3119 | loop. */ | |
c906108c | 3120 | prev_pc = read_pc (); |
cd0fc7c3 SS |
3121 | prev_func_start = ecs->stop_func_start; |
3122 | prev_func_name = ecs->stop_func_name; | |
c906108c | 3123 | } |
104c1213 | 3124 | |
cd0fc7c3 SS |
3125 | /* Let callers know we don't want to wait for the inferior anymore. */ |
3126 | ecs->wait_some_more = 0; | |
3127 | } | |
3128 | ||
d4f3574e SS |
3129 | /* This function handles various cases where we need to continue |
3130 | waiting for the inferior. */ | |
3131 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
3132 | ||
3133 | static void | |
3134 | keep_going (struct execution_control_state *ecs) | |
3135 | { | |
3136 | /* ??rehrauer: ttrace on HP-UX theoretically allows one to debug a | |
3137 | vforked child between its creation and subsequent exit or call to | |
3138 | exec(). However, I had big problems in this rather creaky exec | |
3139 | engine, getting that to work. The fundamental problem is that | |
3140 | I'm trying to debug two processes via an engine that only | |
3141 | understands a single process with possibly multiple threads. | |
3142 | ||
3143 | Hence, this spot is known to have problems when | |
3144 | target_can_follow_vfork_prior_to_exec returns 1. */ | |
3145 | ||
3146 | /* Save the pc before execution, to compare with pc after stop. */ | |
3147 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ | |
3148 | prev_func_start = ecs->stop_func_start; /* Ok, since if DECR_PC_AFTER | |
3149 | BREAK is defined, the | |
3150 | original pc would not have | |
3151 | been at the start of a | |
3152 | function. */ | |
3153 | prev_func_name = ecs->stop_func_name; | |
3154 | ||
3155 | if (ecs->update_step_sp) | |
3156 | step_sp = read_sp (); | |
3157 | ecs->update_step_sp = 0; | |
3158 | ||
3159 | /* If we did not do break;, it means we should keep running the | |
3160 | inferior and not return to debugger. */ | |
3161 | ||
3162 | if (trap_expected && stop_signal != TARGET_SIGNAL_TRAP) | |
3163 | { | |
3164 | /* We took a signal (which we are supposed to pass through to | |
3165 | the inferior, else we'd have done a break above) and we | |
3166 | haven't yet gotten our trap. Simply continue. */ | |
3167 | resume (currently_stepping (ecs), stop_signal); | |
3168 | } | |
3169 | else | |
3170 | { | |
3171 | /* Either the trap was not expected, but we are continuing | |
3172 | anyway (the user asked that this signal be passed to the | |
3173 | child) | |
3174 | -- or -- | |
3175 | The signal was SIGTRAP, e.g. it was our signal, but we | |
3176 | decided we should resume from it. | |
3177 | ||
3178 | We're going to run this baby now! | |
3179 | ||
3180 | Insert breakpoints now, unless we are trying to one-proceed | |
3181 | past a breakpoint. */ | |
3182 | /* If we've just finished a special step resume and we don't | |
3183 | want to hit a breakpoint, pull em out. */ | |
3184 | if (step_resume_breakpoint == NULL | |
3185 | && through_sigtramp_breakpoint == NULL | |
3186 | && ecs->remove_breakpoints_on_following_step) | |
3187 | { | |
3188 | ecs->remove_breakpoints_on_following_step = 0; | |
3189 | remove_breakpoints (); | |
3190 | breakpoints_inserted = 0; | |
3191 | } | |
3192 | else if (!breakpoints_inserted && | |
3193 | (through_sigtramp_breakpoint != NULL || !ecs->another_trap)) | |
3194 | { | |
3195 | breakpoints_failed = insert_breakpoints (); | |
3196 | if (breakpoints_failed) | |
3197 | { | |
3198 | stop_stepping (ecs); | |
3199 | return; | |
3200 | } | |
3201 | breakpoints_inserted = 1; | |
3202 | } | |
3203 | ||
3204 | trap_expected = ecs->another_trap; | |
3205 | ||
3206 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
3207 | specifies that such a signal should be delivered to the | |
3208 | target program). | |
3209 | ||
3210 | Typically, this would occure when a user is debugging a | |
3211 | target monitor on a simulator: the target monitor sets a | |
3212 | breakpoint; the simulator encounters this break-point and | |
3213 | halts the simulation handing control to GDB; GDB, noteing | |
3214 | that the break-point isn't valid, returns control back to the | |
3215 | simulator; the simulator then delivers the hardware | |
3216 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
3217 | ||
3218 | if (stop_signal == TARGET_SIGNAL_TRAP | |
3219 | && !signal_program[stop_signal]) | |
3220 | stop_signal = TARGET_SIGNAL_0; | |
3221 | ||
3222 | #ifdef SHIFT_INST_REGS | |
3223 | /* I'm not sure when this following segment applies. I do know, | |
3224 | now, that we shouldn't rewrite the regs when we were stopped | |
3225 | by a random signal from the inferior process. */ | |
3226 | /* FIXME: Shouldn't this be based on the valid bit of the SXIP? | |
3227 | (this is only used on the 88k). */ | |
3228 | ||
3229 | if (!bpstat_explains_signal (stop_bpstat) | |
3230 | && (stop_signal != TARGET_SIGNAL_CHLD) | |
3231 | && !stopped_by_random_signal) | |
3232 | SHIFT_INST_REGS (); | |
3233 | #endif /* SHIFT_INST_REGS */ | |
3234 | ||
3235 | resume (currently_stepping (ecs), stop_signal); | |
3236 | } | |
3237 | ||
3238 | prepare_to_wait (ecs); | |
3239 | } | |
3240 | ||
104c1213 JM |
3241 | /* This function normally comes after a resume, before |
3242 | handle_inferior_event exits. It takes care of any last bits of | |
3243 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 3244 | |
104c1213 JM |
3245 | static void |
3246 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 3247 | { |
104c1213 JM |
3248 | if (ecs->infwait_state == infwait_normal_state) |
3249 | { | |
3250 | overlay_cache_invalid = 1; | |
3251 | ||
3252 | /* We have to invalidate the registers BEFORE calling | |
3253 | target_wait because they can be loaded from the target while | |
3254 | in target_wait. This makes remote debugging a bit more | |
3255 | efficient for those targets that provide critical registers | |
3256 | as part of their normal status mechanism. */ | |
3257 | ||
3258 | registers_changed (); | |
3259 | ecs->waiton_pid = -1; | |
3260 | ecs->wp = &(ecs->ws); | |
3261 | } | |
3262 | /* This is the old end of the while loop. Let everybody know we | |
3263 | want to wait for the inferior some more and get called again | |
3264 | soon. */ | |
3265 | ecs->wait_some_more = 1; | |
c906108c | 3266 | } |
11cf8741 JM |
3267 | |
3268 | /* Print why the inferior has stopped. We always print something when | |
3269 | the inferior exits, or receives a signal. The rest of the cases are | |
3270 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
3271 | there should be a call to this function from handle_inferior_event() | |
3272 | each time stop_stepping() is called.*/ | |
3273 | static void | |
3274 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
3275 | { | |
3276 | switch (stop_reason) | |
3277 | { | |
3278 | case STOP_UNKNOWN: | |
3279 | /* We don't deal with these cases from handle_inferior_event() | |
3280 | yet. */ | |
3281 | break; | |
3282 | case END_STEPPING_RANGE: | |
3283 | /* We are done with a step/next/si/ni command. */ | |
3284 | /* For now print nothing. */ | |
fb40c209 AC |
3285 | #ifdef UI_OUT |
3286 | /* Print a message only if not in the middle of doing a "step n" | |
3287 | operation for n > 1 */ | |
3288 | if (!step_multi || !stop_step) | |
3289 | if (interpreter_p && strcmp (interpreter_p, "mi") == 0) | |
3290 | ui_out_field_string (uiout, "reason", "end-stepping-range"); | |
3291 | #endif | |
11cf8741 JM |
3292 | break; |
3293 | case BREAKPOINT_HIT: | |
3294 | /* We found a breakpoint. */ | |
3295 | /* For now print nothing. */ | |
3296 | break; | |
3297 | case SIGNAL_EXITED: | |
3298 | /* The inferior was terminated by a signal. */ | |
8b93c638 JM |
3299 | #ifdef UI_OUT |
3300 | annotate_signalled (); | |
fb40c209 AC |
3301 | if (interpreter_p && strcmp (interpreter_p, "mi") == 0) |
3302 | ui_out_field_string (uiout, "reason", "exited-signalled"); | |
8b93c638 JM |
3303 | ui_out_text (uiout, "\nProgram terminated with signal "); |
3304 | annotate_signal_name (); | |
3305 | ui_out_field_string (uiout, "signal-name", target_signal_to_name (stop_info)); | |
3306 | annotate_signal_name_end (); | |
3307 | ui_out_text (uiout, ", "); | |
3308 | annotate_signal_string (); | |
3309 | ui_out_field_string (uiout, "signal-meaning", target_signal_to_string (stop_info)); | |
3310 | annotate_signal_string_end (); | |
3311 | ui_out_text (uiout, ".\n"); | |
3312 | ui_out_text (uiout, "The program no longer exists.\n"); | |
3313 | #else | |
11cf8741 JM |
3314 | annotate_signalled (); |
3315 | printf_filtered ("\nProgram terminated with signal "); | |
3316 | annotate_signal_name (); | |
3317 | printf_filtered ("%s", target_signal_to_name (stop_info)); | |
3318 | annotate_signal_name_end (); | |
3319 | printf_filtered (", "); | |
3320 | annotate_signal_string (); | |
3321 | printf_filtered ("%s", target_signal_to_string (stop_info)); | |
3322 | annotate_signal_string_end (); | |
3323 | printf_filtered (".\n"); | |
3324 | ||
3325 | printf_filtered ("The program no longer exists.\n"); | |
3326 | gdb_flush (gdb_stdout); | |
8b93c638 | 3327 | #endif |
11cf8741 JM |
3328 | break; |
3329 | case EXITED: | |
3330 | /* The inferior program is finished. */ | |
8b93c638 JM |
3331 | #ifdef UI_OUT |
3332 | annotate_exited (stop_info); | |
3333 | if (stop_info) | |
3334 | { | |
fb40c209 AC |
3335 | if (interpreter_p && strcmp (interpreter_p, "mi") == 0) |
3336 | ui_out_field_string (uiout, "reason", "exited"); | |
8b93c638 JM |
3337 | ui_out_text (uiout, "\nProgram exited with code "); |
3338 | ui_out_field_fmt (uiout, "exit-code", "0%o", (unsigned int) stop_info); | |
3339 | ui_out_text (uiout, ".\n"); | |
3340 | } | |
3341 | else | |
3342 | { | |
fb40c209 AC |
3343 | if (interpreter_p && strcmp (interpreter_p, "mi") == 0) |
3344 | ui_out_field_string (uiout, "reason", "exited-normally"); | |
8b93c638 JM |
3345 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
3346 | } | |
3347 | #else | |
11cf8741 JM |
3348 | annotate_exited (stop_info); |
3349 | if (stop_info) | |
3350 | printf_filtered ("\nProgram exited with code 0%o.\n", | |
3351 | (unsigned int) stop_info); | |
3352 | else | |
3353 | printf_filtered ("\nProgram exited normally.\n"); | |
8b93c638 | 3354 | #endif |
11cf8741 JM |
3355 | break; |
3356 | case SIGNAL_RECEIVED: | |
3357 | /* Signal received. The signal table tells us to print about | |
3358 | it. */ | |
8b93c638 JM |
3359 | #ifdef UI_OUT |
3360 | annotate_signal (); | |
3361 | ui_out_text (uiout, "\nProgram received signal "); | |
3362 | annotate_signal_name (); | |
3363 | ui_out_field_string (uiout, "signal-name", target_signal_to_name (stop_info)); | |
3364 | annotate_signal_name_end (); | |
3365 | ui_out_text (uiout, ", "); | |
3366 | annotate_signal_string (); | |
3367 | ui_out_field_string (uiout, "signal-meaning", target_signal_to_string (stop_info)); | |
3368 | annotate_signal_string_end (); | |
3369 | ui_out_text (uiout, ".\n"); | |
3370 | #else | |
11cf8741 JM |
3371 | annotate_signal (); |
3372 | printf_filtered ("\nProgram received signal "); | |
3373 | annotate_signal_name (); | |
3374 | printf_filtered ("%s", target_signal_to_name (stop_info)); | |
3375 | annotate_signal_name_end (); | |
3376 | printf_filtered (", "); | |
3377 | annotate_signal_string (); | |
3378 | printf_filtered ("%s", target_signal_to_string (stop_info)); | |
3379 | annotate_signal_string_end (); | |
3380 | printf_filtered (".\n"); | |
3381 | gdb_flush (gdb_stdout); | |
8b93c638 | 3382 | #endif |
11cf8741 JM |
3383 | break; |
3384 | default: | |
3385 | internal_error ("print_stop_reason: unrecognized enum value"); | |
3386 | break; | |
3387 | } | |
3388 | } | |
c906108c | 3389 | \f |
43ff13b4 | 3390 | |
c906108c SS |
3391 | /* Here to return control to GDB when the inferior stops for real. |
3392 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
3393 | ||
3394 | STOP_PRINT_FRAME nonzero means print the executing frame | |
3395 | (pc, function, args, file, line number and line text). | |
3396 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
3397 | attempting to insert breakpoints. */ | |
3398 | ||
3399 | void | |
96baa820 | 3400 | normal_stop (void) |
c906108c | 3401 | { |
c906108c SS |
3402 | /* As with the notification of thread events, we want to delay |
3403 | notifying the user that we've switched thread context until | |
3404 | the inferior actually stops. | |
3405 | ||
3406 | (Note that there's no point in saying anything if the inferior | |
3407 | has exited!) */ | |
c3f6f71d | 3408 | if ((previous_inferior_pid != inferior_pid) |
7a292a7a | 3409 | && target_has_execution) |
c906108c SS |
3410 | { |
3411 | target_terminal_ours_for_output (); | |
c3f6f71d | 3412 | printf_filtered ("[Switching to %s]\n", |
c906108c | 3413 | target_pid_or_tid_to_str (inferior_pid)); |
c3f6f71d | 3414 | previous_inferior_pid = inferior_pid; |
c906108c | 3415 | } |
c906108c SS |
3416 | |
3417 | /* Make sure that the current_frame's pc is correct. This | |
3418 | is a correction for setting up the frame info before doing | |
3419 | DECR_PC_AFTER_BREAK */ | |
3420 | if (target_has_execution && get_current_frame ()) | |
3421 | (get_current_frame ())->pc = read_pc (); | |
3422 | ||
3423 | if (breakpoints_failed) | |
3424 | { | |
3425 | target_terminal_ours_for_output (); | |
010a3cd9 | 3426 | print_sys_errmsg ("While inserting breakpoints", breakpoints_failed); |
c906108c | 3427 | printf_filtered ("Stopped; cannot insert breakpoints.\n\ |
010a3cd9 EZ |
3428 | The same program may be running in another process,\n\ |
3429 | or you may have requested too many hardware breakpoints\n\ | |
3430 | and/or watchpoints.\n"); | |
c906108c SS |
3431 | } |
3432 | ||
3433 | if (target_has_execution && breakpoints_inserted) | |
3434 | { | |
3435 | if (remove_breakpoints ()) | |
3436 | { | |
3437 | target_terminal_ours_for_output (); | |
3438 | printf_filtered ("Cannot remove breakpoints because "); | |
3439 | printf_filtered ("program is no longer writable.\n"); | |
3440 | printf_filtered ("It might be running in another process.\n"); | |
3441 | printf_filtered ("Further execution is probably impossible.\n"); | |
3442 | } | |
3443 | } | |
3444 | breakpoints_inserted = 0; | |
3445 | ||
3446 | /* Delete the breakpoint we stopped at, if it wants to be deleted. | |
3447 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3448 | ||
3449 | breakpoint_auto_delete (stop_bpstat); | |
3450 | ||
3451 | /* If an auto-display called a function and that got a signal, | |
3452 | delete that auto-display to avoid an infinite recursion. */ | |
3453 | ||
3454 | if (stopped_by_random_signal) | |
3455 | disable_current_display (); | |
3456 | ||
3457 | /* Don't print a message if in the middle of doing a "step n" | |
3458 | operation for n > 1 */ | |
3459 | if (step_multi && stop_step) | |
3460 | goto done; | |
3461 | ||
3462 | target_terminal_ours (); | |
3463 | ||
c906108c SS |
3464 | /* Look up the hook_stop and run it if it exists. */ |
3465 | ||
73bc900d | 3466 | if (stop_command && stop_command->hook_pre) |
c906108c | 3467 | { |
73bc900d | 3468 | catch_errors (hook_stop_stub, stop_command->hook_pre, |
c906108c SS |
3469 | "Error while running hook_stop:\n", RETURN_MASK_ALL); |
3470 | } | |
3471 | ||
3472 | if (!target_has_stack) | |
3473 | { | |
3474 | ||
3475 | goto done; | |
3476 | } | |
3477 | ||
3478 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3479 | and current location is based on that. | |
3480 | Don't do this on return from a stack dummy routine, | |
3481 | or if the program has exited. */ | |
3482 | ||
3483 | if (!stop_stack_dummy) | |
3484 | { | |
3485 | select_frame (get_current_frame (), 0); | |
3486 | ||
3487 | /* Print current location without a level number, if | |
c5aa993b JM |
3488 | we have changed functions or hit a breakpoint. |
3489 | Print source line if we have one. | |
3490 | bpstat_print() contains the logic deciding in detail | |
3491 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3492 | |
d082b2bb AC |
3493 | if (stop_print_frame |
3494 | && selected_frame) | |
c906108c SS |
3495 | { |
3496 | int bpstat_ret; | |
3497 | int source_flag; | |
917317f4 | 3498 | int do_frame_printing = 1; |
c906108c SS |
3499 | |
3500 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3501 | switch (bpstat_ret) |
3502 | { | |
3503 | case PRINT_UNKNOWN: | |
3504 | if (stop_step | |
3505 | && step_frame_address == FRAME_FP (get_current_frame ()) | |
3506 | && step_start_function == find_pc_function (stop_pc)) | |
c5394b80 | 3507 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3508 | else |
c5394b80 | 3509 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3510 | break; |
3511 | case PRINT_SRC_AND_LOC: | |
c5394b80 | 3512 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3513 | break; |
3514 | case PRINT_SRC_ONLY: | |
c5394b80 | 3515 | source_flag = SRC_LINE; |
917317f4 JM |
3516 | break; |
3517 | case PRINT_NOTHING: | |
3518 | do_frame_printing = 0; | |
3519 | break; | |
3520 | default: | |
3521 | internal_error ("Unknown value."); | |
3522 | } | |
fb40c209 AC |
3523 | #ifdef UI_OUT |
3524 | /* For mi, have the same behavior every time we stop: | |
3525 | print everything but the source line. */ | |
3526 | if (interpreter_p && strcmp (interpreter_p, "mi") == 0) | |
3527 | source_flag = LOC_AND_ADDRESS; | |
3528 | #endif | |
c906108c | 3529 | |
fb40c209 AC |
3530 | #ifdef UI_OUT |
3531 | if (interpreter_p && strcmp (interpreter_p, "mi") == 0) | |
3532 | ui_out_field_int (uiout, "thread-id", pid_to_thread_id (inferior_pid)); | |
3533 | #endif | |
c906108c SS |
3534 | /* The behavior of this routine with respect to the source |
3535 | flag is: | |
c5394b80 JM |
3536 | SRC_LINE: Print only source line |
3537 | LOCATION: Print only location | |
3538 | SRC_AND_LOC: Print location and source line */ | |
917317f4 JM |
3539 | if (do_frame_printing) |
3540 | show_and_print_stack_frame (selected_frame, -1, source_flag); | |
c906108c SS |
3541 | |
3542 | /* Display the auto-display expressions. */ | |
3543 | do_displays (); | |
3544 | } | |
3545 | } | |
3546 | ||
3547 | /* Save the function value return registers, if we care. | |
3548 | We might be about to restore their previous contents. */ | |
3549 | if (proceed_to_finish) | |
3550 | read_register_bytes (0, stop_registers, REGISTER_BYTES); | |
3551 | ||
3552 | if (stop_stack_dummy) | |
3553 | { | |
3554 | /* Pop the empty frame that contains the stack dummy. | |
3555 | POP_FRAME ends with a setting of the current frame, so we | |
c5aa993b | 3556 | can use that next. */ |
c906108c SS |
3557 | POP_FRAME; |
3558 | /* Set stop_pc to what it was before we called the function. | |
c5aa993b JM |
3559 | Can't rely on restore_inferior_status because that only gets |
3560 | called if we don't stop in the called function. */ | |
c906108c SS |
3561 | stop_pc = read_pc (); |
3562 | select_frame (get_current_frame (), 0); | |
3563 | } | |
3564 | ||
3565 | ||
3566 | TUIDO (((TuiOpaqueFuncPtr) tui_vCheckDataValues, selected_frame)); | |
3567 | ||
3568 | done: | |
3569 | annotate_stopped (); | |
3570 | } | |
3571 | ||
3572 | static int | |
96baa820 | 3573 | hook_stop_stub (void *cmd) |
c906108c SS |
3574 | { |
3575 | execute_user_command ((struct cmd_list_element *) cmd, 0); | |
3576 | return (0); | |
3577 | } | |
3578 | \f | |
c5aa993b | 3579 | int |
96baa820 | 3580 | signal_stop_state (int signo) |
c906108c SS |
3581 | { |
3582 | return signal_stop[signo]; | |
3583 | } | |
3584 | ||
c5aa993b | 3585 | int |
96baa820 | 3586 | signal_print_state (int signo) |
c906108c SS |
3587 | { |
3588 | return signal_print[signo]; | |
3589 | } | |
3590 | ||
c5aa993b | 3591 | int |
96baa820 | 3592 | signal_pass_state (int signo) |
c906108c SS |
3593 | { |
3594 | return signal_program[signo]; | |
3595 | } | |
3596 | ||
d4f3574e SS |
3597 | int signal_stop_update (signo, state) |
3598 | int signo; | |
3599 | int state; | |
3600 | { | |
3601 | int ret = signal_stop[signo]; | |
3602 | signal_stop[signo] = state; | |
3603 | return ret; | |
3604 | } | |
3605 | ||
3606 | int signal_print_update (signo, state) | |
3607 | int signo; | |
3608 | int state; | |
3609 | { | |
3610 | int ret = signal_print[signo]; | |
3611 | signal_print[signo] = state; | |
3612 | return ret; | |
3613 | } | |
3614 | ||
3615 | int signal_pass_update (signo, state) | |
3616 | int signo; | |
3617 | int state; | |
3618 | { | |
3619 | int ret = signal_program[signo]; | |
3620 | signal_program[signo] = state; | |
3621 | return ret; | |
3622 | } | |
3623 | ||
c906108c | 3624 | static void |
96baa820 | 3625 | sig_print_header (void) |
c906108c SS |
3626 | { |
3627 | printf_filtered ("\ | |
3628 | Signal Stop\tPrint\tPass to program\tDescription\n"); | |
3629 | } | |
3630 | ||
3631 | static void | |
96baa820 | 3632 | sig_print_info (enum target_signal oursig) |
c906108c SS |
3633 | { |
3634 | char *name = target_signal_to_name (oursig); | |
3635 | int name_padding = 13 - strlen (name); | |
96baa820 | 3636 | |
c906108c SS |
3637 | if (name_padding <= 0) |
3638 | name_padding = 0; | |
3639 | ||
3640 | printf_filtered ("%s", name); | |
3641 | printf_filtered ("%*.*s ", name_padding, name_padding, | |
3642 | " "); | |
3643 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); | |
3644 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
3645 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
3646 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
3647 | } | |
3648 | ||
3649 | /* Specify how various signals in the inferior should be handled. */ | |
3650 | ||
3651 | static void | |
96baa820 | 3652 | handle_command (char *args, int from_tty) |
c906108c SS |
3653 | { |
3654 | char **argv; | |
3655 | int digits, wordlen; | |
3656 | int sigfirst, signum, siglast; | |
3657 | enum target_signal oursig; | |
3658 | int allsigs; | |
3659 | int nsigs; | |
3660 | unsigned char *sigs; | |
3661 | struct cleanup *old_chain; | |
3662 | ||
3663 | if (args == NULL) | |
3664 | { | |
3665 | error_no_arg ("signal to handle"); | |
3666 | } | |
3667 | ||
3668 | /* Allocate and zero an array of flags for which signals to handle. */ | |
3669 | ||
3670 | nsigs = (int) TARGET_SIGNAL_LAST; | |
3671 | sigs = (unsigned char *) alloca (nsigs); | |
3672 | memset (sigs, 0, nsigs); | |
3673 | ||
3674 | /* Break the command line up into args. */ | |
3675 | ||
3676 | argv = buildargv (args); | |
3677 | if (argv == NULL) | |
3678 | { | |
3679 | nomem (0); | |
3680 | } | |
7a292a7a | 3681 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3682 | |
3683 | /* Walk through the args, looking for signal oursigs, signal names, and | |
3684 | actions. Signal numbers and signal names may be interspersed with | |
3685 | actions, with the actions being performed for all signals cumulatively | |
3686 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
3687 | ||
3688 | while (*argv != NULL) | |
3689 | { | |
3690 | wordlen = strlen (*argv); | |
3691 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
3692 | {; | |
3693 | } | |
3694 | allsigs = 0; | |
3695 | sigfirst = siglast = -1; | |
3696 | ||
3697 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
3698 | { | |
3699 | /* Apply action to all signals except those used by the | |
3700 | debugger. Silently skip those. */ | |
3701 | allsigs = 1; | |
3702 | sigfirst = 0; | |
3703 | siglast = nsigs - 1; | |
3704 | } | |
3705 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
3706 | { | |
3707 | SET_SIGS (nsigs, sigs, signal_stop); | |
3708 | SET_SIGS (nsigs, sigs, signal_print); | |
3709 | } | |
3710 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
3711 | { | |
3712 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3713 | } | |
3714 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
3715 | { | |
3716 | SET_SIGS (nsigs, sigs, signal_print); | |
3717 | } | |
3718 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
3719 | { | |
3720 | SET_SIGS (nsigs, sigs, signal_program); | |
3721 | } | |
3722 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
3723 | { | |
3724 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3725 | } | |
3726 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
3727 | { | |
3728 | SET_SIGS (nsigs, sigs, signal_program); | |
3729 | } | |
3730 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
3731 | { | |
3732 | UNSET_SIGS (nsigs, sigs, signal_print); | |
3733 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
3734 | } | |
3735 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
3736 | { | |
3737 | UNSET_SIGS (nsigs, sigs, signal_program); | |
3738 | } | |
3739 | else if (digits > 0) | |
3740 | { | |
3741 | /* It is numeric. The numeric signal refers to our own | |
3742 | internal signal numbering from target.h, not to host/target | |
3743 | signal number. This is a feature; users really should be | |
3744 | using symbolic names anyway, and the common ones like | |
3745 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
3746 | ||
3747 | sigfirst = siglast = (int) | |
3748 | target_signal_from_command (atoi (*argv)); | |
3749 | if ((*argv)[digits] == '-') | |
3750 | { | |
3751 | siglast = (int) | |
3752 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
3753 | } | |
3754 | if (sigfirst > siglast) | |
3755 | { | |
3756 | /* Bet he didn't figure we'd think of this case... */ | |
3757 | signum = sigfirst; | |
3758 | sigfirst = siglast; | |
3759 | siglast = signum; | |
3760 | } | |
3761 | } | |
3762 | else | |
3763 | { | |
3764 | oursig = target_signal_from_name (*argv); | |
3765 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
3766 | { | |
3767 | sigfirst = siglast = (int) oursig; | |
3768 | } | |
3769 | else | |
3770 | { | |
3771 | /* Not a number and not a recognized flag word => complain. */ | |
3772 | error ("Unrecognized or ambiguous flag word: \"%s\".", *argv); | |
3773 | } | |
3774 | } | |
3775 | ||
3776 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 3777 | which signals to apply actions to. */ |
c906108c SS |
3778 | |
3779 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
3780 | { | |
3781 | switch ((enum target_signal) signum) | |
3782 | { | |
3783 | case TARGET_SIGNAL_TRAP: | |
3784 | case TARGET_SIGNAL_INT: | |
3785 | if (!allsigs && !sigs[signum]) | |
3786 | { | |
3787 | if (query ("%s is used by the debugger.\n\ | |
3788 | Are you sure you want to change it? ", | |
3789 | target_signal_to_name | |
3790 | ((enum target_signal) signum))) | |
3791 | { | |
3792 | sigs[signum] = 1; | |
3793 | } | |
3794 | else | |
3795 | { | |
3796 | printf_unfiltered ("Not confirmed, unchanged.\n"); | |
3797 | gdb_flush (gdb_stdout); | |
3798 | } | |
3799 | } | |
3800 | break; | |
3801 | case TARGET_SIGNAL_0: | |
3802 | case TARGET_SIGNAL_DEFAULT: | |
3803 | case TARGET_SIGNAL_UNKNOWN: | |
3804 | /* Make sure that "all" doesn't print these. */ | |
3805 | break; | |
3806 | default: | |
3807 | sigs[signum] = 1; | |
3808 | break; | |
3809 | } | |
3810 | } | |
3811 | ||
3812 | argv++; | |
3813 | } | |
3814 | ||
3815 | target_notice_signals (inferior_pid); | |
3816 | ||
3817 | if (from_tty) | |
3818 | { | |
3819 | /* Show the results. */ | |
3820 | sig_print_header (); | |
3821 | for (signum = 0; signum < nsigs; signum++) | |
3822 | { | |
3823 | if (sigs[signum]) | |
3824 | { | |
3825 | sig_print_info (signum); | |
3826 | } | |
3827 | } | |
3828 | } | |
3829 | ||
3830 | do_cleanups (old_chain); | |
3831 | } | |
3832 | ||
3833 | static void | |
96baa820 | 3834 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
3835 | { |
3836 | char **argv; | |
3837 | struct cleanup *old_chain; | |
3838 | ||
3839 | /* Break the command line up into args. */ | |
3840 | ||
3841 | argv = buildargv (args); | |
3842 | if (argv == NULL) | |
3843 | { | |
3844 | nomem (0); | |
3845 | } | |
7a292a7a | 3846 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
3847 | if (argv[1] != (char *) NULL) |
3848 | { | |
3849 | char *argBuf; | |
3850 | int bufLen; | |
3851 | ||
3852 | bufLen = strlen (argv[0]) + 20; | |
3853 | argBuf = (char *) xmalloc (bufLen); | |
3854 | if (argBuf) | |
3855 | { | |
3856 | int validFlag = 1; | |
3857 | enum target_signal oursig; | |
3858 | ||
3859 | oursig = target_signal_from_name (argv[0]); | |
3860 | memset (argBuf, 0, bufLen); | |
3861 | if (strcmp (argv[1], "Q") == 0) | |
3862 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3863 | else | |
3864 | { | |
3865 | if (strcmp (argv[1], "s") == 0) | |
3866 | { | |
3867 | if (!signal_stop[oursig]) | |
3868 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
3869 | else | |
3870 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
3871 | } | |
3872 | else if (strcmp (argv[1], "i") == 0) | |
3873 | { | |
3874 | if (!signal_program[oursig]) | |
3875 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
3876 | else | |
3877 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
3878 | } | |
3879 | else if (strcmp (argv[1], "r") == 0) | |
3880 | { | |
3881 | if (!signal_print[oursig]) | |
3882 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
3883 | else | |
3884 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
3885 | } | |
3886 | else | |
3887 | validFlag = 0; | |
3888 | } | |
3889 | if (validFlag) | |
3890 | handle_command (argBuf, from_tty); | |
3891 | else | |
3892 | printf_filtered ("Invalid signal handling flag.\n"); | |
3893 | if (argBuf) | |
3894 | free (argBuf); | |
3895 | } | |
3896 | } | |
3897 | do_cleanups (old_chain); | |
3898 | } | |
3899 | ||
3900 | /* Print current contents of the tables set by the handle command. | |
3901 | It is possible we should just be printing signals actually used | |
3902 | by the current target (but for things to work right when switching | |
3903 | targets, all signals should be in the signal tables). */ | |
3904 | ||
3905 | static void | |
96baa820 | 3906 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
3907 | { |
3908 | enum target_signal oursig; | |
3909 | sig_print_header (); | |
3910 | ||
3911 | if (signum_exp) | |
3912 | { | |
3913 | /* First see if this is a symbol name. */ | |
3914 | oursig = target_signal_from_name (signum_exp); | |
3915 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
3916 | { | |
3917 | /* No, try numeric. */ | |
3918 | oursig = | |
bb518678 | 3919 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
3920 | } |
3921 | sig_print_info (oursig); | |
3922 | return; | |
3923 | } | |
3924 | ||
3925 | printf_filtered ("\n"); | |
3926 | /* These ugly casts brought to you by the native VAX compiler. */ | |
3927 | for (oursig = TARGET_SIGNAL_FIRST; | |
3928 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
3929 | oursig = (enum target_signal) ((int) oursig + 1)) | |
3930 | { | |
3931 | QUIT; | |
3932 | ||
3933 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
3934 | && oursig != TARGET_SIGNAL_DEFAULT | |
3935 | && oursig != TARGET_SIGNAL_0) | |
3936 | sig_print_info (oursig); | |
3937 | } | |
3938 | ||
3939 | printf_filtered ("\nUse the \"handle\" command to change these tables.\n"); | |
3940 | } | |
3941 | \f | |
7a292a7a SS |
3942 | struct inferior_status |
3943 | { | |
3944 | enum target_signal stop_signal; | |
3945 | CORE_ADDR stop_pc; | |
3946 | bpstat stop_bpstat; | |
3947 | int stop_step; | |
3948 | int stop_stack_dummy; | |
3949 | int stopped_by_random_signal; | |
3950 | int trap_expected; | |
3951 | CORE_ADDR step_range_start; | |
3952 | CORE_ADDR step_range_end; | |
3953 | CORE_ADDR step_frame_address; | |
5fbbeb29 | 3954 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
3955 | CORE_ADDR step_resume_break_address; |
3956 | int stop_after_trap; | |
3957 | int stop_soon_quietly; | |
3958 | CORE_ADDR selected_frame_address; | |
3959 | char *stop_registers; | |
3960 | ||
3961 | /* These are here because if call_function_by_hand has written some | |
3962 | registers and then decides to call error(), we better not have changed | |
3963 | any registers. */ | |
3964 | char *registers; | |
3965 | ||
3966 | int selected_level; | |
3967 | int breakpoint_proceeded; | |
3968 | int restore_stack_info; | |
3969 | int proceed_to_finish; | |
3970 | }; | |
3971 | ||
7a292a7a | 3972 | static struct inferior_status * |
96baa820 | 3973 | xmalloc_inferior_status (void) |
7a292a7a SS |
3974 | { |
3975 | struct inferior_status *inf_status; | |
3976 | inf_status = xmalloc (sizeof (struct inferior_status)); | |
3977 | inf_status->stop_registers = xmalloc (REGISTER_BYTES); | |
3978 | inf_status->registers = xmalloc (REGISTER_BYTES); | |
3979 | return inf_status; | |
3980 | } | |
3981 | ||
7a292a7a | 3982 | static void |
96baa820 | 3983 | free_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
3984 | { |
3985 | free (inf_status->registers); | |
3986 | free (inf_status->stop_registers); | |
3987 | free (inf_status); | |
3988 | } | |
3989 | ||
3990 | void | |
96baa820 JM |
3991 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
3992 | LONGEST val) | |
7a292a7a | 3993 | { |
c5aa993b | 3994 | int size = REGISTER_RAW_SIZE (regno); |
7a292a7a SS |
3995 | void *buf = alloca (size); |
3996 | store_signed_integer (buf, size, val); | |
3997 | memcpy (&inf_status->registers[REGISTER_BYTE (regno)], buf, size); | |
3998 | } | |
3999 | ||
c906108c SS |
4000 | /* Save all of the information associated with the inferior<==>gdb |
4001 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
4002 | (defined in inferior.h). */ | |
4003 | ||
7a292a7a | 4004 | struct inferior_status * |
96baa820 | 4005 | save_inferior_status (int restore_stack_info) |
c906108c | 4006 | { |
7a292a7a SS |
4007 | struct inferior_status *inf_status = xmalloc_inferior_status (); |
4008 | ||
c906108c SS |
4009 | inf_status->stop_signal = stop_signal; |
4010 | inf_status->stop_pc = stop_pc; | |
4011 | inf_status->stop_step = stop_step; | |
4012 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
4013 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
4014 | inf_status->trap_expected = trap_expected; | |
4015 | inf_status->step_range_start = step_range_start; | |
4016 | inf_status->step_range_end = step_range_end; | |
4017 | inf_status->step_frame_address = step_frame_address; | |
4018 | inf_status->step_over_calls = step_over_calls; | |
4019 | inf_status->stop_after_trap = stop_after_trap; | |
4020 | inf_status->stop_soon_quietly = stop_soon_quietly; | |
4021 | /* Save original bpstat chain here; replace it with copy of chain. | |
4022 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
4023 | hand them back the original chain when restore_inferior_status is |
4024 | called. */ | |
c906108c SS |
4025 | inf_status->stop_bpstat = stop_bpstat; |
4026 | stop_bpstat = bpstat_copy (stop_bpstat); | |
4027 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
4028 | inf_status->restore_stack_info = restore_stack_info; | |
4029 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 4030 | |
c906108c SS |
4031 | memcpy (inf_status->stop_registers, stop_registers, REGISTER_BYTES); |
4032 | ||
4033 | read_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
4034 | ||
4035 | record_selected_frame (&(inf_status->selected_frame_address), | |
4036 | &(inf_status->selected_level)); | |
7a292a7a | 4037 | return inf_status; |
c906108c SS |
4038 | } |
4039 | ||
4040 | struct restore_selected_frame_args | |
4041 | { | |
4042 | CORE_ADDR frame_address; | |
4043 | int level; | |
4044 | }; | |
4045 | ||
c906108c | 4046 | static int |
96baa820 | 4047 | restore_selected_frame (void *args) |
c906108c SS |
4048 | { |
4049 | struct restore_selected_frame_args *fr = | |
4050 | (struct restore_selected_frame_args *) args; | |
4051 | struct frame_info *frame; | |
4052 | int level = fr->level; | |
4053 | ||
4054 | frame = find_relative_frame (get_current_frame (), &level); | |
4055 | ||
4056 | /* If inf_status->selected_frame_address is NULL, there was no | |
4057 | previously selected frame. */ | |
4058 | if (frame == NULL || | |
4059 | /* FRAME_FP (frame) != fr->frame_address || */ | |
4060 | /* elz: deleted this check as a quick fix to the problem that | |
c5aa993b JM |
4061 | for function called by hand gdb creates no internal frame |
4062 | structure and the real stack and gdb's idea of stack are | |
4063 | different if nested calls by hands are made. | |
c906108c | 4064 | |
c5aa993b | 4065 | mvs: this worries me. */ |
c906108c SS |
4066 | level != 0) |
4067 | { | |
4068 | warning ("Unable to restore previously selected frame.\n"); | |
4069 | return 0; | |
4070 | } | |
4071 | ||
4072 | select_frame (frame, fr->level); | |
4073 | ||
4074 | return (1); | |
4075 | } | |
4076 | ||
4077 | void | |
96baa820 | 4078 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
4079 | { |
4080 | stop_signal = inf_status->stop_signal; | |
4081 | stop_pc = inf_status->stop_pc; | |
4082 | stop_step = inf_status->stop_step; | |
4083 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
4084 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
4085 | trap_expected = inf_status->trap_expected; | |
4086 | step_range_start = inf_status->step_range_start; | |
4087 | step_range_end = inf_status->step_range_end; | |
4088 | step_frame_address = inf_status->step_frame_address; | |
4089 | step_over_calls = inf_status->step_over_calls; | |
4090 | stop_after_trap = inf_status->stop_after_trap; | |
4091 | stop_soon_quietly = inf_status->stop_soon_quietly; | |
4092 | bpstat_clear (&stop_bpstat); | |
4093 | stop_bpstat = inf_status->stop_bpstat; | |
4094 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
4095 | proceed_to_finish = inf_status->proceed_to_finish; | |
4096 | ||
7a292a7a | 4097 | /* FIXME: Is the restore of stop_registers always needed */ |
c906108c SS |
4098 | memcpy (stop_registers, inf_status->stop_registers, REGISTER_BYTES); |
4099 | ||
4100 | /* The inferior can be gone if the user types "print exit(0)" | |
4101 | (and perhaps other times). */ | |
4102 | if (target_has_execution) | |
4103 | write_register_bytes (0, inf_status->registers, REGISTER_BYTES); | |
4104 | ||
c906108c SS |
4105 | /* FIXME: If we are being called after stopping in a function which |
4106 | is called from gdb, we should not be trying to restore the | |
4107 | selected frame; it just prints a spurious error message (The | |
4108 | message is useful, however, in detecting bugs in gdb (like if gdb | |
4109 | clobbers the stack)). In fact, should we be restoring the | |
4110 | inferior status at all in that case? . */ | |
4111 | ||
4112 | if (target_has_stack && inf_status->restore_stack_info) | |
4113 | { | |
4114 | struct restore_selected_frame_args fr; | |
4115 | fr.level = inf_status->selected_level; | |
4116 | fr.frame_address = inf_status->selected_frame_address; | |
4117 | /* The point of catch_errors is that if the stack is clobbered, | |
c5aa993b JM |
4118 | walking the stack might encounter a garbage pointer and error() |
4119 | trying to dereference it. */ | |
c906108c SS |
4120 | if (catch_errors (restore_selected_frame, &fr, |
4121 | "Unable to restore previously selected frame:\n", | |
4122 | RETURN_MASK_ERROR) == 0) | |
4123 | /* Error in restoring the selected frame. Select the innermost | |
4124 | frame. */ | |
4125 | ||
4126 | ||
4127 | select_frame (get_current_frame (), 0); | |
4128 | ||
4129 | } | |
c906108c | 4130 | |
7a292a7a SS |
4131 | free_inferior_status (inf_status); |
4132 | } | |
c906108c | 4133 | |
74b7792f AC |
4134 | static void |
4135 | do_restore_inferior_status_cleanup (void *sts) | |
4136 | { | |
4137 | restore_inferior_status (sts); | |
4138 | } | |
4139 | ||
4140 | struct cleanup * | |
4141 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
4142 | { | |
4143 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
4144 | } | |
4145 | ||
c906108c | 4146 | void |
96baa820 | 4147 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
4148 | { |
4149 | /* See save_inferior_status for info on stop_bpstat. */ | |
4150 | bpstat_clear (&inf_status->stop_bpstat); | |
4151 | free_inferior_status (inf_status); | |
4152 | } | |
4153 | ||
c5aa993b | 4154 | \f |
7a292a7a | 4155 | static void |
96baa820 | 4156 | build_infrun (void) |
7a292a7a SS |
4157 | { |
4158 | stop_registers = xmalloc (REGISTER_BYTES); | |
4159 | } | |
c906108c | 4160 | |
c906108c | 4161 | void |
96baa820 | 4162 | _initialize_infrun (void) |
c906108c SS |
4163 | { |
4164 | register int i; | |
4165 | register int numsigs; | |
4166 | struct cmd_list_element *c; | |
4167 | ||
7a292a7a SS |
4168 | build_infrun (); |
4169 | ||
0f71a2f6 JM |
4170 | register_gdbarch_swap (&stop_registers, sizeof (stop_registers), NULL); |
4171 | register_gdbarch_swap (NULL, 0, build_infrun); | |
4172 | ||
c906108c SS |
4173 | add_info ("signals", signals_info, |
4174 | "What debugger does when program gets various signals.\n\ | |
4175 | Specify a signal as argument to print info on that signal only."); | |
4176 | add_info_alias ("handle", "signals", 0); | |
4177 | ||
4178 | add_com ("handle", class_run, handle_command, | |
4179 | concat ("Specify how to handle a signal.\n\ | |
4180 | Args are signals and actions to apply to those signals.\n\ | |
4181 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
4182 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
4183 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
4184 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
4185 | used by the debugger, typically SIGTRAP and SIGINT.\n", | |
4186 | "Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
4187 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ | |
4188 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
4189 | Print means print a message if this signal happens.\n\ | |
4190 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
4191 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
4192 | Pass and Stop may be combined.", NULL)); | |
4193 | if (xdb_commands) | |
4194 | { | |
4195 | add_com ("lz", class_info, signals_info, | |
4196 | "What debugger does when program gets various signals.\n\ | |
4197 | Specify a signal as argument to print info on that signal only."); | |
4198 | add_com ("z", class_run, xdb_handle_command, | |
4199 | concat ("Specify how to handle a signal.\n\ | |
4200 | Args are signals and actions to apply to those signals.\n\ | |
4201 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
4202 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
4203 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
4204 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
4205 | used by the debugger, typically SIGTRAP and SIGINT.\n", | |
4206 | "Recognized actions include \"s\" (toggles between stop and nostop), \n\ | |
4207 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ | |
4208 | nopass), \"Q\" (noprint)\n\ | |
4209 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
4210 | Print means print a message if this signal happens.\n\ | |
4211 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
4212 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
4213 | Pass and Stop may be combined.", NULL)); | |
4214 | } | |
4215 | ||
4216 | if (!dbx_commands) | |
4217 | stop_command = add_cmd ("stop", class_obscure, not_just_help_class_command, | |
4218 | "There is no `stop' command, but you can set a hook on `stop'.\n\ | |
4219 | This allows you to set a list of commands to be run each time execution\n\ | |
4220 | of the program stops.", &cmdlist); | |
4221 | ||
4222 | numsigs = (int) TARGET_SIGNAL_LAST; | |
4223 | signal_stop = (unsigned char *) | |
4224 | xmalloc (sizeof (signal_stop[0]) * numsigs); | |
4225 | signal_print = (unsigned char *) | |
4226 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
4227 | signal_program = (unsigned char *) | |
4228 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
4229 | for (i = 0; i < numsigs; i++) | |
4230 | { | |
4231 | signal_stop[i] = 1; | |
4232 | signal_print[i] = 1; | |
4233 | signal_program[i] = 1; | |
4234 | } | |
4235 | ||
4236 | /* Signals caused by debugger's own actions | |
4237 | should not be given to the program afterwards. */ | |
4238 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
4239 | signal_program[TARGET_SIGNAL_INT] = 0; | |
4240 | ||
4241 | /* Signals that are not errors should not normally enter the debugger. */ | |
4242 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
4243 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
4244 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
4245 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
4246 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
4247 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
4248 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
4249 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
4250 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
4251 | signal_print[TARGET_SIGNAL_IO] = 0; | |
4252 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
4253 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
4254 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
4255 | signal_print[TARGET_SIGNAL_URG] = 0; | |
4256 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
4257 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
4258 | ||
cd0fc7c3 SS |
4259 | /* These signals are used internally by user-level thread |
4260 | implementations. (See signal(5) on Solaris.) Like the above | |
4261 | signals, a healthy program receives and handles them as part of | |
4262 | its normal operation. */ | |
4263 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
4264 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
4265 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
4266 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
4267 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
4268 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
4269 | ||
c906108c SS |
4270 | #ifdef SOLIB_ADD |
4271 | add_show_from_set | |
4272 | (add_set_cmd ("stop-on-solib-events", class_support, var_zinteger, | |
4273 | (char *) &stop_on_solib_events, | |
4274 | "Set stopping for shared library events.\n\ | |
4275 | If nonzero, gdb will give control to the user when the dynamic linker\n\ | |
4276 | notifies gdb of shared library events. The most common event of interest\n\ | |
4277 | to the user would be loading/unloading of a new library.\n", | |
4278 | &setlist), | |
4279 | &showlist); | |
4280 | #endif | |
4281 | ||
4282 | c = add_set_enum_cmd ("follow-fork-mode", | |
4283 | class_run, | |
4284 | follow_fork_mode_kind_names, | |
1ed2a135 | 4285 | &follow_fork_mode_string, |
c906108c SS |
4286 | /* ??rehrauer: The "both" option is broken, by what may be a 10.20 |
4287 | kernel problem. It's also not terribly useful without a GUI to | |
4288 | help the user drive two debuggers. So for now, I'm disabling | |
4289 | the "both" option. */ | |
c5aa993b JM |
4290 | /* "Set debugger response to a program call of fork \ |
4291 | or vfork.\n\ | |
4292 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
4293 | parent - the original process is debugged after a fork\n\ | |
4294 | child - the new process is debugged after a fork\n\ | |
4295 | both - both the parent and child are debugged after a fork\n\ | |
4296 | ask - the debugger will ask for one of the above choices\n\ | |
4297 | For \"both\", another copy of the debugger will be started to follow\n\ | |
4298 | the new child process. The original debugger will continue to follow\n\ | |
4299 | the original parent process. To distinguish their prompts, the\n\ | |
4300 | debugger copy's prompt will be changed.\n\ | |
4301 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
4302 | By default, the debugger will follow the parent process.", | |
4303 | */ | |
c906108c SS |
4304 | "Set debugger response to a program call of fork \ |
4305 | or vfork.\n\ | |
4306 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ | |
4307 | parent - the original process is debugged after a fork\n\ | |
4308 | child - the new process is debugged after a fork\n\ | |
4309 | ask - the debugger will ask for one of the above choices\n\ | |
4310 | For \"parent\" or \"child\", the unfollowed process will run free.\n\ | |
4311 | By default, the debugger will follow the parent process.", | |
4312 | &setlist); | |
c5aa993b | 4313 | /* c->function.sfunc = ; */ |
c906108c SS |
4314 | add_show_from_set (c, &showlist); |
4315 | ||
c906108c SS |
4316 | c = add_set_enum_cmd ("scheduler-locking", class_run, |
4317 | scheduler_enums, /* array of string names */ | |
1ed2a135 | 4318 | &scheduler_mode, /* current mode */ |
c906108c SS |
4319 | "Set mode for locking scheduler during execution.\n\ |
4320 | off == no locking (threads may preempt at any time)\n\ | |
4321 | on == full locking (no thread except the current thread may run)\n\ | |
4322 | step == scheduler locked during every single-step operation.\n\ | |
4323 | In this mode, no other thread may run during a step command.\n\ | |
4324 | Other threads may run while stepping over a function call ('next').", | |
4325 | &setlist); | |
4326 | ||
4327 | c->function.sfunc = set_schedlock_func; /* traps on target vector */ | |
4328 | add_show_from_set (c, &showlist); | |
5fbbeb29 CF |
4329 | |
4330 | c = add_set_cmd ("step-mode", class_run, | |
4331 | var_boolean, (char*) &step_stop_if_no_debug, | |
4332 | "Set mode of the step operation. When set, doing a step over a\n\ | |
4333 | function without debug line information will stop at the first\n\ | |
4334 | instruction of that function. Otherwise, the function is skipped and\n\ | |
4335 | the step command stops at a different source line.", | |
4336 | &setlist); | |
4337 | add_show_from_set (c, &showlist); | |
c906108c | 4338 | } |