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Commit | Line | Data |
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ca557f44 AC |
1 | /* Target-struct-independent code to start (run) and stop an inferior |
2 | process. | |
8926118c | 3 | |
6aba47ca | 4 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
9b254dd1 DJ |
5 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
6 | 2008 Free Software Foundation, Inc. | |
c906108c | 7 | |
c5aa993b | 8 | This file is part of GDB. |
c906108c | 9 | |
c5aa993b JM |
10 | This program is free software; you can redistribute it and/or modify |
11 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 12 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 13 | (at your option) any later version. |
c906108c | 14 | |
c5aa993b JM |
15 | This program is distributed in the hope that it will be useful, |
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | GNU General Public License for more details. | |
c906108c | 19 | |
c5aa993b | 20 | You should have received a copy of the GNU General Public License |
a9762ec7 | 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "gdb_string.h" | |
25 | #include <ctype.h> | |
26 | #include "symtab.h" | |
27 | #include "frame.h" | |
28 | #include "inferior.h" | |
60250e8b | 29 | #include "exceptions.h" |
c906108c | 30 | #include "breakpoint.h" |
03f2053f | 31 | #include "gdb_wait.h" |
c906108c SS |
32 | #include "gdbcore.h" |
33 | #include "gdbcmd.h" | |
210661e7 | 34 | #include "cli/cli-script.h" |
c906108c SS |
35 | #include "target.h" |
36 | #include "gdbthread.h" | |
37 | #include "annotate.h" | |
1adeb98a | 38 | #include "symfile.h" |
7a292a7a | 39 | #include "top.h" |
c906108c | 40 | #include <signal.h> |
2acceee2 | 41 | #include "inf-loop.h" |
4e052eda | 42 | #include "regcache.h" |
fd0407d6 | 43 | #include "value.h" |
06600e06 | 44 | #include "observer.h" |
f636b87d | 45 | #include "language.h" |
a77053c2 | 46 | #include "solib.h" |
f17517ea | 47 | #include "main.h" |
a77053c2 | 48 | |
9f976b41 | 49 | #include "gdb_assert.h" |
034dad6f | 50 | #include "mi/mi-common.h" |
4f8d22e3 | 51 | #include "event-top.h" |
c906108c SS |
52 | |
53 | /* Prototypes for local functions */ | |
54 | ||
96baa820 | 55 | static void signals_info (char *, int); |
c906108c | 56 | |
96baa820 | 57 | static void handle_command (char *, int); |
c906108c | 58 | |
96baa820 | 59 | static void sig_print_info (enum target_signal); |
c906108c | 60 | |
96baa820 | 61 | static void sig_print_header (void); |
c906108c | 62 | |
74b7792f | 63 | static void resume_cleanups (void *); |
c906108c | 64 | |
96baa820 | 65 | static int hook_stop_stub (void *); |
c906108c | 66 | |
96baa820 JM |
67 | static int restore_selected_frame (void *); |
68 | ||
69 | static void build_infrun (void); | |
70 | ||
4ef3f3be | 71 | static int follow_fork (void); |
96baa820 JM |
72 | |
73 | static void set_schedlock_func (char *args, int from_tty, | |
488f131b | 74 | struct cmd_list_element *c); |
96baa820 | 75 | |
0d1e5fa7 | 76 | struct thread_stepping_state; |
96baa820 | 77 | |
0d1e5fa7 | 78 | static int currently_stepping (struct thread_stepping_state *tss); |
96baa820 JM |
79 | |
80 | static void xdb_handle_command (char *args, int from_tty); | |
81 | ||
6a6b96b9 | 82 | static int prepare_to_proceed (int); |
ea67f13b | 83 | |
96baa820 | 84 | void _initialize_infrun (void); |
43ff13b4 | 85 | |
5fbbeb29 CF |
86 | /* When set, stop the 'step' command if we enter a function which has |
87 | no line number information. The normal behavior is that we step | |
88 | over such function. */ | |
89 | int step_stop_if_no_debug = 0; | |
920d2a44 AC |
90 | static void |
91 | show_step_stop_if_no_debug (struct ui_file *file, int from_tty, | |
92 | struct cmd_list_element *c, const char *value) | |
93 | { | |
94 | fprintf_filtered (file, _("Mode of the step operation is %s.\n"), value); | |
95 | } | |
5fbbeb29 | 96 | |
43ff13b4 | 97 | /* In asynchronous mode, but simulating synchronous execution. */ |
96baa820 | 98 | |
43ff13b4 JM |
99 | int sync_execution = 0; |
100 | ||
c906108c SS |
101 | /* wait_for_inferior and normal_stop use this to notify the user |
102 | when the inferior stopped in a different thread than it had been | |
96baa820 JM |
103 | running in. */ |
104 | ||
39f77062 | 105 | static ptid_t previous_inferior_ptid; |
7a292a7a | 106 | |
237fc4c9 PA |
107 | int debug_displaced = 0; |
108 | static void | |
109 | show_debug_displaced (struct ui_file *file, int from_tty, | |
110 | struct cmd_list_element *c, const char *value) | |
111 | { | |
112 | fprintf_filtered (file, _("Displace stepping debugging is %s.\n"), value); | |
113 | } | |
114 | ||
527159b7 | 115 | static int debug_infrun = 0; |
920d2a44 AC |
116 | static void |
117 | show_debug_infrun (struct ui_file *file, int from_tty, | |
118 | struct cmd_list_element *c, const char *value) | |
119 | { | |
120 | fprintf_filtered (file, _("Inferior debugging is %s.\n"), value); | |
121 | } | |
527159b7 | 122 | |
d4f3574e SS |
123 | /* If the program uses ELF-style shared libraries, then calls to |
124 | functions in shared libraries go through stubs, which live in a | |
125 | table called the PLT (Procedure Linkage Table). The first time the | |
126 | function is called, the stub sends control to the dynamic linker, | |
127 | which looks up the function's real address, patches the stub so | |
128 | that future calls will go directly to the function, and then passes | |
129 | control to the function. | |
130 | ||
131 | If we are stepping at the source level, we don't want to see any of | |
132 | this --- we just want to skip over the stub and the dynamic linker. | |
133 | The simple approach is to single-step until control leaves the | |
134 | dynamic linker. | |
135 | ||
ca557f44 AC |
136 | However, on some systems (e.g., Red Hat's 5.2 distribution) the |
137 | dynamic linker calls functions in the shared C library, so you | |
138 | can't tell from the PC alone whether the dynamic linker is still | |
139 | running. In this case, we use a step-resume breakpoint to get us | |
140 | past the dynamic linker, as if we were using "next" to step over a | |
141 | function call. | |
d4f3574e | 142 | |
cfd8ab24 | 143 | in_solib_dynsym_resolve_code() says whether we're in the dynamic |
d4f3574e SS |
144 | linker code or not. Normally, this means we single-step. However, |
145 | if SKIP_SOLIB_RESOLVER then returns non-zero, then its value is an | |
146 | address where we can place a step-resume breakpoint to get past the | |
147 | linker's symbol resolution function. | |
148 | ||
cfd8ab24 | 149 | in_solib_dynsym_resolve_code() can generally be implemented in a |
d4f3574e SS |
150 | pretty portable way, by comparing the PC against the address ranges |
151 | of the dynamic linker's sections. | |
152 | ||
153 | SKIP_SOLIB_RESOLVER is generally going to be system-specific, since | |
154 | it depends on internal details of the dynamic linker. It's usually | |
155 | not too hard to figure out where to put a breakpoint, but it | |
156 | certainly isn't portable. SKIP_SOLIB_RESOLVER should do plenty of | |
157 | sanity checking. If it can't figure things out, returning zero and | |
158 | getting the (possibly confusing) stepping behavior is better than | |
159 | signalling an error, which will obscure the change in the | |
160 | inferior's state. */ | |
c906108c | 161 | |
c906108c SS |
162 | /* This function returns TRUE if pc is the address of an instruction |
163 | that lies within the dynamic linker (such as the event hook, or the | |
164 | dld itself). | |
165 | ||
166 | This function must be used only when a dynamic linker event has | |
167 | been caught, and the inferior is being stepped out of the hook, or | |
168 | undefined results are guaranteed. */ | |
169 | ||
170 | #ifndef SOLIB_IN_DYNAMIC_LINKER | |
171 | #define SOLIB_IN_DYNAMIC_LINKER(pid,pc) 0 | |
172 | #endif | |
173 | ||
c2c6d25f | 174 | |
7a292a7a SS |
175 | /* Convert the #defines into values. This is temporary until wfi control |
176 | flow is completely sorted out. */ | |
177 | ||
692590c1 MS |
178 | #ifndef CANNOT_STEP_HW_WATCHPOINTS |
179 | #define CANNOT_STEP_HW_WATCHPOINTS 0 | |
180 | #else | |
181 | #undef CANNOT_STEP_HW_WATCHPOINTS | |
182 | #define CANNOT_STEP_HW_WATCHPOINTS 1 | |
183 | #endif | |
184 | ||
c906108c SS |
185 | /* Tables of how to react to signals; the user sets them. */ |
186 | ||
187 | static unsigned char *signal_stop; | |
188 | static unsigned char *signal_print; | |
189 | static unsigned char *signal_program; | |
190 | ||
191 | #define SET_SIGS(nsigs,sigs,flags) \ | |
192 | do { \ | |
193 | int signum = (nsigs); \ | |
194 | while (signum-- > 0) \ | |
195 | if ((sigs)[signum]) \ | |
196 | (flags)[signum] = 1; \ | |
197 | } while (0) | |
198 | ||
199 | #define UNSET_SIGS(nsigs,sigs,flags) \ | |
200 | do { \ | |
201 | int signum = (nsigs); \ | |
202 | while (signum-- > 0) \ | |
203 | if ((sigs)[signum]) \ | |
204 | (flags)[signum] = 0; \ | |
205 | } while (0) | |
206 | ||
39f77062 KB |
207 | /* Value to pass to target_resume() to cause all threads to resume */ |
208 | ||
209 | #define RESUME_ALL (pid_to_ptid (-1)) | |
c906108c SS |
210 | |
211 | /* Command list pointer for the "stop" placeholder. */ | |
212 | ||
213 | static struct cmd_list_element *stop_command; | |
214 | ||
c906108c SS |
215 | /* Function inferior was in as of last step command. */ |
216 | ||
217 | static struct symbol *step_start_function; | |
218 | ||
ca67fcb8 | 219 | /* Nonzero if we are presently stepping over a breakpoint. |
c906108c | 220 | |
ca67fcb8 VP |
221 | If we hit a breakpoint or watchpoint, and then continue, |
222 | we need to single step the current thread with breakpoints | |
223 | disabled, to avoid hitting the same breakpoint or | |
224 | watchpoint again. And we should step just a single | |
225 | thread and keep other threads stopped, so that | |
226 | other threads don't miss breakpoints while they are removed. | |
227 | ||
228 | So, this variable simultaneously means that we need to single | |
229 | step the current thread, keep other threads stopped, and that | |
230 | breakpoints should be removed while we step. | |
231 | ||
232 | This variable is set either: | |
233 | - in proceed, when we resume inferior on user's explicit request | |
234 | - in keep_going, if handle_inferior_event decides we need to | |
235 | step over breakpoint. | |
236 | ||
237 | The variable is cleared in clear_proceed_status, called every | |
238 | time before we call proceed. The proceed calls wait_for_inferior, | |
239 | which calls handle_inferior_event in a loop, and until | |
240 | wait_for_inferior exits, this variable is changed only by keep_going. */ | |
241 | ||
242 | static int stepping_over_breakpoint; | |
c906108c | 243 | |
c906108c SS |
244 | /* Nonzero if we want to give control to the user when we're notified |
245 | of shared library events by the dynamic linker. */ | |
246 | static int stop_on_solib_events; | |
920d2a44 AC |
247 | static void |
248 | show_stop_on_solib_events (struct ui_file *file, int from_tty, | |
249 | struct cmd_list_element *c, const char *value) | |
250 | { | |
251 | fprintf_filtered (file, _("Stopping for shared library events is %s.\n"), | |
252 | value); | |
253 | } | |
c906108c | 254 | |
c906108c SS |
255 | /* Nonzero means expecting a trace trap |
256 | and should stop the inferior and return silently when it happens. */ | |
257 | ||
258 | int stop_after_trap; | |
259 | ||
260 | /* Nonzero means expecting a trap and caller will handle it themselves. | |
261 | It is used after attach, due to attaching to a process; | |
262 | when running in the shell before the child program has been exec'd; | |
263 | and when running some kinds of remote stuff (FIXME?). */ | |
264 | ||
c0236d92 | 265 | enum stop_kind stop_soon; |
c906108c SS |
266 | |
267 | /* Nonzero if proceed is being used for a "finish" command or a similar | |
268 | situation when stop_registers should be saved. */ | |
269 | ||
270 | int proceed_to_finish; | |
271 | ||
272 | /* Save register contents here when about to pop a stack dummy frame, | |
273 | if-and-only-if proceed_to_finish is set. | |
274 | Thus this contains the return value from the called function (assuming | |
275 | values are returned in a register). */ | |
276 | ||
72cec141 | 277 | struct regcache *stop_registers; |
c906108c | 278 | |
c906108c SS |
279 | /* Nonzero after stop if current stack frame should be printed. */ |
280 | ||
281 | static int stop_print_frame; | |
282 | ||
611c83ae | 283 | /* Step-resume or longjmp-resume breakpoint. */ |
c906108c | 284 | static struct breakpoint *step_resume_breakpoint = NULL; |
c906108c | 285 | |
e02bc4cc | 286 | /* This is a cached copy of the pid/waitstatus of the last event |
9a4105ab AC |
287 | returned by target_wait()/deprecated_target_wait_hook(). This |
288 | information is returned by get_last_target_status(). */ | |
39f77062 | 289 | static ptid_t target_last_wait_ptid; |
e02bc4cc DS |
290 | static struct target_waitstatus target_last_waitstatus; |
291 | ||
0d1e5fa7 PA |
292 | /* Context-switchable data. */ |
293 | struct thread_stepping_state | |
294 | { | |
295 | /* Should we step over breakpoint next time keep_going | |
296 | is called? */ | |
297 | int stepping_over_breakpoint; | |
0d1e5fa7 PA |
298 | int current_line; |
299 | struct symtab *current_symtab; | |
300 | int step_after_step_resume_breakpoint; | |
301 | int stepping_through_solib_after_catch; | |
302 | bpstat stepping_through_solib_catchpoints; | |
303 | }; | |
304 | ||
305 | struct thread_stepping_state gtss; | |
306 | struct thread_stepping_state *tss = >ss; | |
307 | ||
308 | static void context_switch (ptid_t ptid); | |
309 | ||
310 | void init_thread_stepping_state (struct thread_stepping_state *tss); | |
311 | ||
312 | void init_infwait_state (void); | |
a474d7c2 | 313 | |
c906108c SS |
314 | /* This is used to remember when a fork, vfork or exec event |
315 | was caught by a catchpoint, and thus the event is to be | |
316 | followed at the next resume of the inferior, and not | |
317 | immediately. */ | |
318 | static struct | |
488f131b JB |
319 | { |
320 | enum target_waitkind kind; | |
321 | struct | |
c906108c | 322 | { |
3a3e9ee3 PA |
323 | ptid_t parent_pid; |
324 | ptid_t child_pid; | |
c906108c | 325 | } |
488f131b JB |
326 | fork_event; |
327 | char *execd_pathname; | |
328 | } | |
c906108c SS |
329 | pending_follow; |
330 | ||
53904c9e AC |
331 | static const char follow_fork_mode_child[] = "child"; |
332 | static const char follow_fork_mode_parent[] = "parent"; | |
333 | ||
488f131b | 334 | static const char *follow_fork_mode_kind_names[] = { |
53904c9e AC |
335 | follow_fork_mode_child, |
336 | follow_fork_mode_parent, | |
337 | NULL | |
ef346e04 | 338 | }; |
c906108c | 339 | |
53904c9e | 340 | static const char *follow_fork_mode_string = follow_fork_mode_parent; |
920d2a44 AC |
341 | static void |
342 | show_follow_fork_mode_string (struct ui_file *file, int from_tty, | |
343 | struct cmd_list_element *c, const char *value) | |
344 | { | |
345 | fprintf_filtered (file, _("\ | |
346 | Debugger response to a program call of fork or vfork is \"%s\".\n"), | |
347 | value); | |
348 | } | |
c906108c SS |
349 | \f |
350 | ||
6604731b | 351 | static int |
4ef3f3be | 352 | follow_fork (void) |
c906108c | 353 | { |
ea1dd7bc | 354 | int follow_child = (follow_fork_mode_string == follow_fork_mode_child); |
c906108c | 355 | |
6604731b | 356 | return target_follow_fork (follow_child); |
c906108c SS |
357 | } |
358 | ||
6604731b DJ |
359 | void |
360 | follow_inferior_reset_breakpoints (void) | |
c906108c | 361 | { |
6604731b DJ |
362 | /* Was there a step_resume breakpoint? (There was if the user |
363 | did a "next" at the fork() call.) If so, explicitly reset its | |
364 | thread number. | |
365 | ||
366 | step_resumes are a form of bp that are made to be per-thread. | |
367 | Since we created the step_resume bp when the parent process | |
368 | was being debugged, and now are switching to the child process, | |
369 | from the breakpoint package's viewpoint, that's a switch of | |
370 | "threads". We must update the bp's notion of which thread | |
371 | it is for, or it'll be ignored when it triggers. */ | |
372 | ||
373 | if (step_resume_breakpoint) | |
374 | breakpoint_re_set_thread (step_resume_breakpoint); | |
375 | ||
376 | /* Reinsert all breakpoints in the child. The user may have set | |
377 | breakpoints after catching the fork, in which case those | |
378 | were never set in the child, but only in the parent. This makes | |
379 | sure the inserted breakpoints match the breakpoint list. */ | |
380 | ||
381 | breakpoint_re_set (); | |
382 | insert_breakpoints (); | |
c906108c | 383 | } |
c906108c | 384 | |
1adeb98a FN |
385 | /* EXECD_PATHNAME is assumed to be non-NULL. */ |
386 | ||
c906108c | 387 | static void |
3a3e9ee3 | 388 | follow_exec (ptid_t pid, char *execd_pathname) |
c906108c | 389 | { |
3a3e9ee3 | 390 | ptid_t saved_pid = pid; |
7a292a7a SS |
391 | struct target_ops *tgt; |
392 | ||
c906108c SS |
393 | /* This is an exec event that we actually wish to pay attention to. |
394 | Refresh our symbol table to the newly exec'd program, remove any | |
395 | momentary bp's, etc. | |
396 | ||
397 | If there are breakpoints, they aren't really inserted now, | |
398 | since the exec() transformed our inferior into a fresh set | |
399 | of instructions. | |
400 | ||
401 | We want to preserve symbolic breakpoints on the list, since | |
402 | we have hopes that they can be reset after the new a.out's | |
403 | symbol table is read. | |
404 | ||
405 | However, any "raw" breakpoints must be removed from the list | |
406 | (e.g., the solib bp's), since their address is probably invalid | |
407 | now. | |
408 | ||
409 | And, we DON'T want to call delete_breakpoints() here, since | |
410 | that may write the bp's "shadow contents" (the instruction | |
411 | value that was overwritten witha TRAP instruction). Since | |
412 | we now have a new a.out, those shadow contents aren't valid. */ | |
413 | update_breakpoints_after_exec (); | |
414 | ||
415 | /* If there was one, it's gone now. We cannot truly step-to-next | |
416 | statement through an exec(). */ | |
417 | step_resume_breakpoint = NULL; | |
418 | step_range_start = 0; | |
419 | step_range_end = 0; | |
420 | ||
c906108c | 421 | /* What is this a.out's name? */ |
a3f17187 | 422 | printf_unfiltered (_("Executing new program: %s\n"), execd_pathname); |
c906108c SS |
423 | |
424 | /* We've followed the inferior through an exec. Therefore, the | |
425 | inferior has essentially been killed & reborn. */ | |
7a292a7a | 426 | |
c906108c | 427 | gdb_flush (gdb_stdout); |
e85a822c | 428 | generic_mourn_inferior (); |
488f131b | 429 | /* Because mourn_inferior resets inferior_ptid. */ |
3a3e9ee3 | 430 | inferior_ptid = saved_pid; |
e85a822c DJ |
431 | |
432 | if (gdb_sysroot && *gdb_sysroot) | |
433 | { | |
434 | char *name = alloca (strlen (gdb_sysroot) | |
435 | + strlen (execd_pathname) | |
436 | + 1); | |
437 | strcpy (name, gdb_sysroot); | |
438 | strcat (name, execd_pathname); | |
439 | execd_pathname = name; | |
440 | } | |
c906108c SS |
441 | |
442 | /* That a.out is now the one to use. */ | |
443 | exec_file_attach (execd_pathname, 0); | |
444 | ||
cce9b6bf PA |
445 | /* Reset the shared library package. This ensures that we get a |
446 | shlib event when the child reaches "_start", at which point the | |
447 | dld will have had a chance to initialize the child. */ | |
448 | /* Also, loading a symbol file below may trigger symbol lookups, and | |
449 | we don't want those to be satisfied by the libraries of the | |
450 | previous incarnation of this process. */ | |
451 | no_shared_libraries (NULL, 0); | |
452 | ||
453 | /* Load the main file's symbols. */ | |
1adeb98a | 454 | symbol_file_add_main (execd_pathname, 0); |
c906108c | 455 | |
7a292a7a | 456 | #ifdef SOLIB_CREATE_INFERIOR_HOOK |
39f77062 | 457 | SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid)); |
a77053c2 MK |
458 | #else |
459 | solib_create_inferior_hook (); | |
7a292a7a | 460 | #endif |
c906108c SS |
461 | |
462 | /* Reinsert all breakpoints. (Those which were symbolic have | |
463 | been reset to the proper address in the new a.out, thanks | |
464 | to symbol_file_command...) */ | |
465 | insert_breakpoints (); | |
466 | ||
467 | /* The next resume of this inferior should bring it to the shlib | |
468 | startup breakpoints. (If the user had also set bp's on | |
469 | "main" from the old (parent) process, then they'll auto- | |
470 | matically get reset there in the new process.) */ | |
c906108c SS |
471 | } |
472 | ||
473 | /* Non-zero if we just simulating a single-step. This is needed | |
474 | because we cannot remove the breakpoints in the inferior process | |
475 | until after the `wait' in `wait_for_inferior'. */ | |
476 | static int singlestep_breakpoints_inserted_p = 0; | |
9f976b41 DJ |
477 | |
478 | /* The thread we inserted single-step breakpoints for. */ | |
479 | static ptid_t singlestep_ptid; | |
480 | ||
fd48f117 DJ |
481 | /* PC when we started this single-step. */ |
482 | static CORE_ADDR singlestep_pc; | |
483 | ||
9f976b41 DJ |
484 | /* If another thread hit the singlestep breakpoint, we save the original |
485 | thread here so that we can resume single-stepping it later. */ | |
486 | static ptid_t saved_singlestep_ptid; | |
487 | static int stepping_past_singlestep_breakpoint; | |
6a6b96b9 | 488 | |
ca67fcb8 VP |
489 | /* If not equal to null_ptid, this means that after stepping over breakpoint |
490 | is finished, we need to switch to deferred_step_ptid, and step it. | |
491 | ||
492 | The use case is when one thread has hit a breakpoint, and then the user | |
493 | has switched to another thread and issued 'step'. We need to step over | |
494 | breakpoint in the thread which hit the breakpoint, but then continue | |
495 | stepping the thread user has selected. */ | |
496 | static ptid_t deferred_step_ptid; | |
c906108c | 497 | \f |
237fc4c9 PA |
498 | /* Displaced stepping. */ |
499 | ||
500 | /* In non-stop debugging mode, we must take special care to manage | |
501 | breakpoints properly; in particular, the traditional strategy for | |
502 | stepping a thread past a breakpoint it has hit is unsuitable. | |
503 | 'Displaced stepping' is a tactic for stepping one thread past a | |
504 | breakpoint it has hit while ensuring that other threads running | |
505 | concurrently will hit the breakpoint as they should. | |
506 | ||
507 | The traditional way to step a thread T off a breakpoint in a | |
508 | multi-threaded program in all-stop mode is as follows: | |
509 | ||
510 | a0) Initially, all threads are stopped, and breakpoints are not | |
511 | inserted. | |
512 | a1) We single-step T, leaving breakpoints uninserted. | |
513 | a2) We insert breakpoints, and resume all threads. | |
514 | ||
515 | In non-stop debugging, however, this strategy is unsuitable: we | |
516 | don't want to have to stop all threads in the system in order to | |
517 | continue or step T past a breakpoint. Instead, we use displaced | |
518 | stepping: | |
519 | ||
520 | n0) Initially, T is stopped, other threads are running, and | |
521 | breakpoints are inserted. | |
522 | n1) We copy the instruction "under" the breakpoint to a separate | |
523 | location, outside the main code stream, making any adjustments | |
524 | to the instruction, register, and memory state as directed by | |
525 | T's architecture. | |
526 | n2) We single-step T over the instruction at its new location. | |
527 | n3) We adjust the resulting register and memory state as directed | |
528 | by T's architecture. This includes resetting T's PC to point | |
529 | back into the main instruction stream. | |
530 | n4) We resume T. | |
531 | ||
532 | This approach depends on the following gdbarch methods: | |
533 | ||
534 | - gdbarch_max_insn_length and gdbarch_displaced_step_location | |
535 | indicate where to copy the instruction, and how much space must | |
536 | be reserved there. We use these in step n1. | |
537 | ||
538 | - gdbarch_displaced_step_copy_insn copies a instruction to a new | |
539 | address, and makes any necessary adjustments to the instruction, | |
540 | register contents, and memory. We use this in step n1. | |
541 | ||
542 | - gdbarch_displaced_step_fixup adjusts registers and memory after | |
543 | we have successfuly single-stepped the instruction, to yield the | |
544 | same effect the instruction would have had if we had executed it | |
545 | at its original address. We use this in step n3. | |
546 | ||
547 | - gdbarch_displaced_step_free_closure provides cleanup. | |
548 | ||
549 | The gdbarch_displaced_step_copy_insn and | |
550 | gdbarch_displaced_step_fixup functions must be written so that | |
551 | copying an instruction with gdbarch_displaced_step_copy_insn, | |
552 | single-stepping across the copied instruction, and then applying | |
553 | gdbarch_displaced_insn_fixup should have the same effects on the | |
554 | thread's memory and registers as stepping the instruction in place | |
555 | would have. Exactly which responsibilities fall to the copy and | |
556 | which fall to the fixup is up to the author of those functions. | |
557 | ||
558 | See the comments in gdbarch.sh for details. | |
559 | ||
560 | Note that displaced stepping and software single-step cannot | |
561 | currently be used in combination, although with some care I think | |
562 | they could be made to. Software single-step works by placing | |
563 | breakpoints on all possible subsequent instructions; if the | |
564 | displaced instruction is a PC-relative jump, those breakpoints | |
565 | could fall in very strange places --- on pages that aren't | |
566 | executable, or at addresses that are not proper instruction | |
567 | boundaries. (We do generally let other threads run while we wait | |
568 | to hit the software single-step breakpoint, and they might | |
569 | encounter such a corrupted instruction.) One way to work around | |
570 | this would be to have gdbarch_displaced_step_copy_insn fully | |
571 | simulate the effect of PC-relative instructions (and return NULL) | |
572 | on architectures that use software single-stepping. | |
573 | ||
574 | In non-stop mode, we can have independent and simultaneous step | |
575 | requests, so more than one thread may need to simultaneously step | |
576 | over a breakpoint. The current implementation assumes there is | |
577 | only one scratch space per process. In this case, we have to | |
578 | serialize access to the scratch space. If thread A wants to step | |
579 | over a breakpoint, but we are currently waiting for some other | |
580 | thread to complete a displaced step, we leave thread A stopped and | |
581 | place it in the displaced_step_request_queue. Whenever a displaced | |
582 | step finishes, we pick the next thread in the queue and start a new | |
583 | displaced step operation on it. See displaced_step_prepare and | |
584 | displaced_step_fixup for details. */ | |
585 | ||
586 | /* If this is not null_ptid, this is the thread carrying out a | |
587 | displaced single-step. This thread's state will require fixing up | |
588 | once it has completed its step. */ | |
589 | static ptid_t displaced_step_ptid; | |
590 | ||
591 | struct displaced_step_request | |
592 | { | |
593 | ptid_t ptid; | |
594 | struct displaced_step_request *next; | |
595 | }; | |
596 | ||
597 | /* A queue of pending displaced stepping requests. */ | |
598 | struct displaced_step_request *displaced_step_request_queue; | |
599 | ||
600 | /* The architecture the thread had when we stepped it. */ | |
601 | static struct gdbarch *displaced_step_gdbarch; | |
602 | ||
603 | /* The closure provided gdbarch_displaced_step_copy_insn, to be used | |
604 | for post-step cleanup. */ | |
605 | static struct displaced_step_closure *displaced_step_closure; | |
606 | ||
607 | /* The address of the original instruction, and the copy we made. */ | |
608 | static CORE_ADDR displaced_step_original, displaced_step_copy; | |
609 | ||
610 | /* Saved contents of copy area. */ | |
611 | static gdb_byte *displaced_step_saved_copy; | |
612 | ||
613 | /* When this is non-zero, we are allowed to use displaced stepping, if | |
614 | the architecture supports it. When this is zero, we use | |
615 | traditional the hold-and-step approach. */ | |
616 | int can_use_displaced_stepping = 1; | |
617 | static void | |
618 | show_can_use_displaced_stepping (struct ui_file *file, int from_tty, | |
619 | struct cmd_list_element *c, | |
620 | const char *value) | |
621 | { | |
622 | fprintf_filtered (file, _("\ | |
623 | Debugger's willingness to use displaced stepping to step over " | |
624 | "breakpoints is %s.\n"), value); | |
625 | } | |
626 | ||
627 | /* Return non-zero if displaced stepping is enabled, and can be used | |
628 | with GDBARCH. */ | |
629 | static int | |
630 | use_displaced_stepping (struct gdbarch *gdbarch) | |
631 | { | |
632 | return (can_use_displaced_stepping | |
633 | && gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
634 | } | |
635 | ||
636 | /* Clean out any stray displaced stepping state. */ | |
637 | static void | |
638 | displaced_step_clear (void) | |
639 | { | |
640 | /* Indicate that there is no cleanup pending. */ | |
641 | displaced_step_ptid = null_ptid; | |
642 | ||
643 | if (displaced_step_closure) | |
644 | { | |
645 | gdbarch_displaced_step_free_closure (displaced_step_gdbarch, | |
646 | displaced_step_closure); | |
647 | displaced_step_closure = NULL; | |
648 | } | |
649 | } | |
650 | ||
651 | static void | |
652 | cleanup_displaced_step_closure (void *ptr) | |
653 | { | |
654 | struct displaced_step_closure *closure = ptr; | |
655 | ||
656 | gdbarch_displaced_step_free_closure (current_gdbarch, closure); | |
657 | } | |
658 | ||
659 | /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */ | |
660 | void | |
661 | displaced_step_dump_bytes (struct ui_file *file, | |
662 | const gdb_byte *buf, | |
663 | size_t len) | |
664 | { | |
665 | int i; | |
666 | ||
667 | for (i = 0; i < len; i++) | |
668 | fprintf_unfiltered (file, "%02x ", buf[i]); | |
669 | fputs_unfiltered ("\n", file); | |
670 | } | |
671 | ||
672 | /* Prepare to single-step, using displaced stepping. | |
673 | ||
674 | Note that we cannot use displaced stepping when we have a signal to | |
675 | deliver. If we have a signal to deliver and an instruction to step | |
676 | over, then after the step, there will be no indication from the | |
677 | target whether the thread entered a signal handler or ignored the | |
678 | signal and stepped over the instruction successfully --- both cases | |
679 | result in a simple SIGTRAP. In the first case we mustn't do a | |
680 | fixup, and in the second case we must --- but we can't tell which. | |
681 | Comments in the code for 'random signals' in handle_inferior_event | |
682 | explain how we handle this case instead. | |
683 | ||
684 | Returns 1 if preparing was successful -- this thread is going to be | |
685 | stepped now; or 0 if displaced stepping this thread got queued. */ | |
686 | static int | |
687 | displaced_step_prepare (ptid_t ptid) | |
688 | { | |
689 | struct cleanup *old_cleanups; | |
690 | struct regcache *regcache = get_thread_regcache (ptid); | |
691 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
692 | CORE_ADDR original, copy; | |
693 | ULONGEST len; | |
694 | struct displaced_step_closure *closure; | |
695 | ||
696 | /* We should never reach this function if the architecture does not | |
697 | support displaced stepping. */ | |
698 | gdb_assert (gdbarch_displaced_step_copy_insn_p (gdbarch)); | |
699 | ||
700 | /* For the first cut, we're displaced stepping one thread at a | |
701 | time. */ | |
702 | ||
703 | if (!ptid_equal (displaced_step_ptid, null_ptid)) | |
704 | { | |
705 | /* Already waiting for a displaced step to finish. Defer this | |
706 | request and place in queue. */ | |
707 | struct displaced_step_request *req, *new_req; | |
708 | ||
709 | if (debug_displaced) | |
710 | fprintf_unfiltered (gdb_stdlog, | |
711 | "displaced: defering step of %s\n", | |
712 | target_pid_to_str (ptid)); | |
713 | ||
714 | new_req = xmalloc (sizeof (*new_req)); | |
715 | new_req->ptid = ptid; | |
716 | new_req->next = NULL; | |
717 | ||
718 | if (displaced_step_request_queue) | |
719 | { | |
720 | for (req = displaced_step_request_queue; | |
721 | req && req->next; | |
722 | req = req->next) | |
723 | ; | |
724 | req->next = new_req; | |
725 | } | |
726 | else | |
727 | displaced_step_request_queue = new_req; | |
728 | ||
729 | return 0; | |
730 | } | |
731 | else | |
732 | { | |
733 | if (debug_displaced) | |
734 | fprintf_unfiltered (gdb_stdlog, | |
735 | "displaced: stepping %s now\n", | |
736 | target_pid_to_str (ptid)); | |
737 | } | |
738 | ||
739 | displaced_step_clear (); | |
740 | ||
515630c5 | 741 | original = regcache_read_pc (regcache); |
237fc4c9 PA |
742 | |
743 | copy = gdbarch_displaced_step_location (gdbarch); | |
744 | len = gdbarch_max_insn_length (gdbarch); | |
745 | ||
746 | /* Save the original contents of the copy area. */ | |
747 | displaced_step_saved_copy = xmalloc (len); | |
748 | old_cleanups = make_cleanup (free_current_contents, | |
749 | &displaced_step_saved_copy); | |
750 | read_memory (copy, displaced_step_saved_copy, len); | |
751 | if (debug_displaced) | |
752 | { | |
753 | fprintf_unfiltered (gdb_stdlog, "displaced: saved 0x%s: ", | |
754 | paddr_nz (copy)); | |
755 | displaced_step_dump_bytes (gdb_stdlog, displaced_step_saved_copy, len); | |
756 | }; | |
757 | ||
758 | closure = gdbarch_displaced_step_copy_insn (gdbarch, | |
759 | original, copy, regcache); | |
760 | ||
761 | /* We don't support the fully-simulated case at present. */ | |
762 | gdb_assert (closure); | |
763 | ||
764 | make_cleanup (cleanup_displaced_step_closure, closure); | |
765 | ||
766 | /* Resume execution at the copy. */ | |
515630c5 | 767 | regcache_write_pc (regcache, copy); |
237fc4c9 PA |
768 | |
769 | discard_cleanups (old_cleanups); | |
770 | ||
771 | if (debug_displaced) | |
772 | fprintf_unfiltered (gdb_stdlog, "displaced: displaced pc to 0x%s\n", | |
773 | paddr_nz (copy)); | |
774 | ||
775 | /* Save the information we need to fix things up if the step | |
776 | succeeds. */ | |
777 | displaced_step_ptid = ptid; | |
778 | displaced_step_gdbarch = gdbarch; | |
779 | displaced_step_closure = closure; | |
780 | displaced_step_original = original; | |
781 | displaced_step_copy = copy; | |
782 | return 1; | |
783 | } | |
784 | ||
785 | static void | |
786 | displaced_step_clear_cleanup (void *ignore) | |
787 | { | |
788 | displaced_step_clear (); | |
789 | } | |
790 | ||
791 | static void | |
792 | write_memory_ptid (ptid_t ptid, CORE_ADDR memaddr, const gdb_byte *myaddr, int len) | |
793 | { | |
794 | struct cleanup *ptid_cleanup = save_inferior_ptid (); | |
795 | inferior_ptid = ptid; | |
796 | write_memory (memaddr, myaddr, len); | |
797 | do_cleanups (ptid_cleanup); | |
798 | } | |
799 | ||
800 | static void | |
801 | displaced_step_fixup (ptid_t event_ptid, enum target_signal signal) | |
802 | { | |
803 | struct cleanup *old_cleanups; | |
804 | ||
805 | /* Was this event for the pid we displaced? */ | |
806 | if (ptid_equal (displaced_step_ptid, null_ptid) | |
807 | || ! ptid_equal (displaced_step_ptid, event_ptid)) | |
808 | return; | |
809 | ||
810 | old_cleanups = make_cleanup (displaced_step_clear_cleanup, 0); | |
811 | ||
812 | /* Restore the contents of the copy area. */ | |
813 | { | |
814 | ULONGEST len = gdbarch_max_insn_length (displaced_step_gdbarch); | |
815 | write_memory_ptid (displaced_step_ptid, displaced_step_copy, | |
816 | displaced_step_saved_copy, len); | |
817 | if (debug_displaced) | |
818 | fprintf_unfiltered (gdb_stdlog, "displaced: restored 0x%s\n", | |
819 | paddr_nz (displaced_step_copy)); | |
820 | } | |
821 | ||
822 | /* Did the instruction complete successfully? */ | |
823 | if (signal == TARGET_SIGNAL_TRAP) | |
824 | { | |
825 | /* Fix up the resulting state. */ | |
826 | gdbarch_displaced_step_fixup (displaced_step_gdbarch, | |
827 | displaced_step_closure, | |
828 | displaced_step_original, | |
829 | displaced_step_copy, | |
830 | get_thread_regcache (displaced_step_ptid)); | |
831 | } | |
832 | else | |
833 | { | |
834 | /* Since the instruction didn't complete, all we can do is | |
835 | relocate the PC. */ | |
515630c5 UW |
836 | struct regcache *regcache = get_thread_regcache (event_ptid); |
837 | CORE_ADDR pc = regcache_read_pc (regcache); | |
237fc4c9 | 838 | pc = displaced_step_original + (pc - displaced_step_copy); |
515630c5 | 839 | regcache_write_pc (regcache, pc); |
237fc4c9 PA |
840 | } |
841 | ||
842 | do_cleanups (old_cleanups); | |
843 | ||
844 | /* Are there any pending displaced stepping requests? If so, run | |
845 | one now. */ | |
846 | if (displaced_step_request_queue) | |
847 | { | |
848 | struct displaced_step_request *head; | |
849 | ptid_t ptid; | |
850 | ||
851 | head = displaced_step_request_queue; | |
852 | ptid = head->ptid; | |
853 | displaced_step_request_queue = head->next; | |
854 | xfree (head); | |
855 | ||
856 | if (debug_displaced) | |
857 | fprintf_unfiltered (gdb_stdlog, | |
858 | "displaced: stepping queued %s now\n", | |
859 | target_pid_to_str (ptid)); | |
860 | ||
861 | ||
862 | displaced_step_ptid = null_ptid; | |
863 | displaced_step_prepare (ptid); | |
864 | target_resume (ptid, 1, TARGET_SIGNAL_0); | |
865 | } | |
866 | } | |
867 | ||
5231c1fd PA |
868 | /* Update global variables holding ptids to hold NEW_PTID if they were |
869 | holding OLD_PTID. */ | |
870 | static void | |
871 | infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid) | |
872 | { | |
873 | struct displaced_step_request *it; | |
874 | ||
875 | if (ptid_equal (inferior_ptid, old_ptid)) | |
876 | inferior_ptid = new_ptid; | |
877 | ||
878 | if (ptid_equal (singlestep_ptid, old_ptid)) | |
879 | singlestep_ptid = new_ptid; | |
880 | ||
881 | if (ptid_equal (displaced_step_ptid, old_ptid)) | |
882 | displaced_step_ptid = new_ptid; | |
883 | ||
884 | if (ptid_equal (deferred_step_ptid, old_ptid)) | |
885 | deferred_step_ptid = new_ptid; | |
886 | ||
887 | for (it = displaced_step_request_queue; it; it = it->next) | |
888 | if (ptid_equal (it->ptid, old_ptid)) | |
889 | it->ptid = new_ptid; | |
890 | } | |
891 | ||
237fc4c9 PA |
892 | \f |
893 | /* Resuming. */ | |
c906108c SS |
894 | |
895 | /* Things to clean up if we QUIT out of resume (). */ | |
c906108c | 896 | static void |
74b7792f | 897 | resume_cleanups (void *ignore) |
c906108c SS |
898 | { |
899 | normal_stop (); | |
900 | } | |
901 | ||
53904c9e AC |
902 | static const char schedlock_off[] = "off"; |
903 | static const char schedlock_on[] = "on"; | |
904 | static const char schedlock_step[] = "step"; | |
488f131b | 905 | static const char *scheduler_enums[] = { |
ef346e04 AC |
906 | schedlock_off, |
907 | schedlock_on, | |
908 | schedlock_step, | |
909 | NULL | |
910 | }; | |
920d2a44 AC |
911 | static const char *scheduler_mode = schedlock_off; |
912 | static void | |
913 | show_scheduler_mode (struct ui_file *file, int from_tty, | |
914 | struct cmd_list_element *c, const char *value) | |
915 | { | |
916 | fprintf_filtered (file, _("\ | |
917 | Mode for locking scheduler during execution is \"%s\".\n"), | |
918 | value); | |
919 | } | |
c906108c SS |
920 | |
921 | static void | |
96baa820 | 922 | set_schedlock_func (char *args, int from_tty, struct cmd_list_element *c) |
c906108c | 923 | { |
eefe576e AC |
924 | if (!target_can_lock_scheduler) |
925 | { | |
926 | scheduler_mode = schedlock_off; | |
927 | error (_("Target '%s' cannot support this command."), target_shortname); | |
928 | } | |
c906108c SS |
929 | } |
930 | ||
931 | ||
932 | /* Resume the inferior, but allow a QUIT. This is useful if the user | |
933 | wants to interrupt some lengthy single-stepping operation | |
934 | (for child processes, the SIGINT goes to the inferior, and so | |
935 | we get a SIGINT random_signal, but for remote debugging and perhaps | |
936 | other targets, that's not true). | |
937 | ||
938 | STEP nonzero if we should step (zero to continue instead). | |
939 | SIG is the signal to give the inferior (zero for none). */ | |
940 | void | |
96baa820 | 941 | resume (int step, enum target_signal sig) |
c906108c SS |
942 | { |
943 | int should_resume = 1; | |
74b7792f | 944 | struct cleanup *old_cleanups = make_cleanup (resume_cleanups, 0); |
515630c5 UW |
945 | struct regcache *regcache = get_current_regcache (); |
946 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
947 | CORE_ADDR pc = regcache_read_pc (regcache); | |
c906108c SS |
948 | QUIT; |
949 | ||
527159b7 | 950 | if (debug_infrun) |
237fc4c9 PA |
951 | fprintf_unfiltered (gdb_stdlog, |
952 | "infrun: resume (step=%d, signal=%d), " | |
953 | "stepping_over_breakpoint=%d\n", | |
954 | step, sig, stepping_over_breakpoint); | |
c906108c | 955 | |
692590c1 MS |
956 | /* Some targets (e.g. Solaris x86) have a kernel bug when stepping |
957 | over an instruction that causes a page fault without triggering | |
958 | a hardware watchpoint. The kernel properly notices that it shouldn't | |
959 | stop, because the hardware watchpoint is not triggered, but it forgets | |
960 | the step request and continues the program normally. | |
961 | Work around the problem by removing hardware watchpoints if a step is | |
962 | requested, GDB will check for a hardware watchpoint trigger after the | |
963 | step anyway. */ | |
c36b740a | 964 | if (CANNOT_STEP_HW_WATCHPOINTS && step) |
692590c1 | 965 | remove_hw_watchpoints (); |
488f131b | 966 | |
692590c1 | 967 | |
c2c6d25f JM |
968 | /* Normally, by the time we reach `resume', the breakpoints are either |
969 | removed or inserted, as appropriate. The exception is if we're sitting | |
970 | at a permanent breakpoint; we need to step over it, but permanent | |
971 | breakpoints can't be removed. So we have to test for it here. */ | |
237fc4c9 | 972 | if (breakpoint_here_p (pc) == permanent_breakpoint_here) |
6d350bb5 | 973 | { |
515630c5 UW |
974 | if (gdbarch_skip_permanent_breakpoint_p (gdbarch)) |
975 | gdbarch_skip_permanent_breakpoint (gdbarch, regcache); | |
6d350bb5 UW |
976 | else |
977 | error (_("\ | |
978 | The program is stopped at a permanent breakpoint, but GDB does not know\n\ | |
979 | how to step past a permanent breakpoint on this architecture. Try using\n\ | |
980 | a command like `return' or `jump' to continue execution.")); | |
981 | } | |
c2c6d25f | 982 | |
237fc4c9 PA |
983 | /* If enabled, step over breakpoints by executing a copy of the |
984 | instruction at a different address. | |
985 | ||
986 | We can't use displaced stepping when we have a signal to deliver; | |
987 | the comments for displaced_step_prepare explain why. The | |
988 | comments in the handle_inferior event for dealing with 'random | |
989 | signals' explain what we do instead. */ | |
515630c5 | 990 | if (use_displaced_stepping (gdbarch) |
237fc4c9 PA |
991 | && stepping_over_breakpoint |
992 | && sig == TARGET_SIGNAL_0) | |
993 | { | |
994 | if (!displaced_step_prepare (inferior_ptid)) | |
d56b7306 VP |
995 | { |
996 | /* Got placed in displaced stepping queue. Will be resumed | |
997 | later when all the currently queued displaced stepping | |
7f7efbd9 VP |
998 | requests finish. The thread is not executing at this point, |
999 | and the call to set_executing will be made later. But we | |
1000 | need to call set_running here, since from frontend point of view, | |
1001 | the thread is running. */ | |
1002 | set_running (inferior_ptid, 1); | |
d56b7306 VP |
1003 | discard_cleanups (old_cleanups); |
1004 | return; | |
1005 | } | |
237fc4c9 PA |
1006 | } |
1007 | ||
515630c5 | 1008 | if (step && gdbarch_software_single_step_p (gdbarch)) |
c906108c SS |
1009 | { |
1010 | /* Do it the hard way, w/temp breakpoints */ | |
515630c5 | 1011 | if (gdbarch_software_single_step (gdbarch, get_current_frame ())) |
e6590a1b UW |
1012 | { |
1013 | /* ...and don't ask hardware to do it. */ | |
1014 | step = 0; | |
1015 | /* and do not pull these breakpoints until after a `wait' in | |
1016 | `wait_for_inferior' */ | |
1017 | singlestep_breakpoints_inserted_p = 1; | |
1018 | singlestep_ptid = inferior_ptid; | |
237fc4c9 | 1019 | singlestep_pc = pc; |
e6590a1b | 1020 | } |
c906108c SS |
1021 | } |
1022 | ||
c906108c | 1023 | /* If there were any forks/vforks/execs that were caught and are |
6604731b | 1024 | now to be followed, then do so. */ |
c906108c SS |
1025 | switch (pending_follow.kind) |
1026 | { | |
6604731b DJ |
1027 | case TARGET_WAITKIND_FORKED: |
1028 | case TARGET_WAITKIND_VFORKED: | |
c906108c | 1029 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
6604731b DJ |
1030 | if (follow_fork ()) |
1031 | should_resume = 0; | |
c906108c SS |
1032 | break; |
1033 | ||
6604731b | 1034 | case TARGET_WAITKIND_EXECD: |
c906108c | 1035 | /* follow_exec is called as soon as the exec event is seen. */ |
6604731b | 1036 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; |
c906108c SS |
1037 | break; |
1038 | ||
1039 | default: | |
1040 | break; | |
1041 | } | |
c906108c SS |
1042 | |
1043 | /* Install inferior's terminal modes. */ | |
1044 | target_terminal_inferior (); | |
1045 | ||
1046 | if (should_resume) | |
1047 | { | |
39f77062 | 1048 | ptid_t resume_ptid; |
dfcd3bfb | 1049 | |
488f131b | 1050 | resume_ptid = RESUME_ALL; /* Default */ |
ef5cf84e | 1051 | |
cd76b0b7 VP |
1052 | /* If STEP is set, it's a request to use hardware stepping |
1053 | facilities. But in that case, we should never | |
1054 | use singlestep breakpoint. */ | |
1055 | gdb_assert (!(singlestep_breakpoints_inserted_p && step)); | |
1056 | ||
1057 | if (singlestep_breakpoints_inserted_p | |
1058 | && stepping_past_singlestep_breakpoint) | |
c906108c | 1059 | { |
cd76b0b7 VP |
1060 | /* The situation here is as follows. In thread T1 we wanted to |
1061 | single-step. Lacking hardware single-stepping we've | |
1062 | set breakpoint at the PC of the next instruction -- call it | |
1063 | P. After resuming, we've hit that breakpoint in thread T2. | |
1064 | Now we've removed original breakpoint, inserted breakpoint | |
1065 | at P+1, and try to step to advance T2 past breakpoint. | |
1066 | We need to step only T2, as if T1 is allowed to freely run, | |
1067 | it can run past P, and if other threads are allowed to run, | |
1068 | they can hit breakpoint at P+1, and nested hits of single-step | |
1069 | breakpoints is not something we'd want -- that's complicated | |
1070 | to support, and has no value. */ | |
1071 | resume_ptid = inferior_ptid; | |
1072 | } | |
c906108c | 1073 | |
e842223a | 1074 | if ((step || singlestep_breakpoints_inserted_p) |
74960c60 | 1075 | && stepping_over_breakpoint) |
cd76b0b7 | 1076 | { |
74960c60 VP |
1077 | /* We're allowing a thread to run past a breakpoint it has |
1078 | hit, by single-stepping the thread with the breakpoint | |
1079 | removed. In which case, we need to single-step only this | |
1080 | thread, and keep others stopped, as they can miss this | |
1081 | breakpoint if allowed to run. | |
1082 | ||
1083 | The current code actually removes all breakpoints when | |
1084 | doing this, not just the one being stepped over, so if we | |
1085 | let other threads run, we can actually miss any | |
1086 | breakpoint, not just the one at PC. */ | |
ef5cf84e | 1087 | resume_ptid = inferior_ptid; |
c906108c | 1088 | } |
ef5cf84e | 1089 | |
94cc34af PA |
1090 | if (non_stop) |
1091 | { | |
1092 | /* With non-stop mode on, threads are always handled | |
1093 | individually. */ | |
1094 | resume_ptid = inferior_ptid; | |
1095 | } | |
1096 | else if ((scheduler_mode == schedlock_on) | |
1097 | || (scheduler_mode == schedlock_step | |
1098 | && (step || singlestep_breakpoints_inserted_p))) | |
c906108c | 1099 | { |
ef5cf84e | 1100 | /* User-settable 'scheduler' mode requires solo thread resume. */ |
488f131b | 1101 | resume_ptid = inferior_ptid; |
c906108c | 1102 | } |
ef5cf84e | 1103 | |
515630c5 | 1104 | if (gdbarch_cannot_step_breakpoint (gdbarch)) |
c4ed33b9 AC |
1105 | { |
1106 | /* Most targets can step a breakpoint instruction, thus | |
1107 | executing it normally. But if this one cannot, just | |
1108 | continue and we will hit it anyway. */ | |
237fc4c9 | 1109 | if (step && breakpoint_inserted_here_p (pc)) |
c4ed33b9 AC |
1110 | step = 0; |
1111 | } | |
237fc4c9 PA |
1112 | |
1113 | if (debug_displaced | |
515630c5 | 1114 | && use_displaced_stepping (gdbarch) |
237fc4c9 PA |
1115 | && stepping_over_breakpoint) |
1116 | { | |
515630c5 UW |
1117 | struct regcache *resume_regcache = get_thread_regcache (resume_ptid); |
1118 | CORE_ADDR actual_pc = regcache_read_pc (resume_regcache); | |
237fc4c9 PA |
1119 | gdb_byte buf[4]; |
1120 | ||
1121 | fprintf_unfiltered (gdb_stdlog, "displaced: run 0x%s: ", | |
1122 | paddr_nz (actual_pc)); | |
1123 | read_memory (actual_pc, buf, sizeof (buf)); | |
1124 | displaced_step_dump_bytes (gdb_stdlog, buf, sizeof (buf)); | |
1125 | } | |
1126 | ||
39f77062 | 1127 | target_resume (resume_ptid, step, sig); |
c906108c SS |
1128 | } |
1129 | ||
1130 | discard_cleanups (old_cleanups); | |
1131 | } | |
1132 | \f | |
237fc4c9 | 1133 | /* Proceeding. */ |
c906108c SS |
1134 | |
1135 | /* Clear out all variables saying what to do when inferior is continued. | |
1136 | First do this, then set the ones you want, then call `proceed'. */ | |
1137 | ||
1138 | void | |
96baa820 | 1139 | clear_proceed_status (void) |
c906108c | 1140 | { |
ca67fcb8 | 1141 | stepping_over_breakpoint = 0; |
c906108c SS |
1142 | step_range_start = 0; |
1143 | step_range_end = 0; | |
aa0cd9c1 | 1144 | step_frame_id = null_frame_id; |
5fbbeb29 | 1145 | step_over_calls = STEP_OVER_UNDEBUGGABLE; |
c906108c | 1146 | stop_after_trap = 0; |
c0236d92 | 1147 | stop_soon = NO_STOP_QUIETLY; |
c906108c SS |
1148 | proceed_to_finish = 0; |
1149 | breakpoint_proceeded = 1; /* We're about to proceed... */ | |
1150 | ||
d5c31457 UW |
1151 | if (stop_registers) |
1152 | { | |
1153 | regcache_xfree (stop_registers); | |
1154 | stop_registers = NULL; | |
1155 | } | |
1156 | ||
c906108c SS |
1157 | /* Discard any remaining commands or status from previous stop. */ |
1158 | bpstat_clear (&stop_bpstat); | |
1159 | } | |
1160 | ||
ea67f13b DJ |
1161 | /* This should be suitable for any targets that support threads. */ |
1162 | ||
1163 | static int | |
6a6b96b9 | 1164 | prepare_to_proceed (int step) |
ea67f13b DJ |
1165 | { |
1166 | ptid_t wait_ptid; | |
1167 | struct target_waitstatus wait_status; | |
1168 | ||
1169 | /* Get the last target status returned by target_wait(). */ | |
1170 | get_last_target_status (&wait_ptid, &wait_status); | |
1171 | ||
6a6b96b9 | 1172 | /* Make sure we were stopped at a breakpoint. */ |
ea67f13b | 1173 | if (wait_status.kind != TARGET_WAITKIND_STOPPED |
6a6b96b9 | 1174 | || wait_status.value.sig != TARGET_SIGNAL_TRAP) |
ea67f13b DJ |
1175 | { |
1176 | return 0; | |
1177 | } | |
1178 | ||
6a6b96b9 | 1179 | /* Switched over from WAIT_PID. */ |
ea67f13b | 1180 | if (!ptid_equal (wait_ptid, minus_one_ptid) |
515630c5 | 1181 | && !ptid_equal (inferior_ptid, wait_ptid)) |
ea67f13b | 1182 | { |
515630c5 UW |
1183 | struct regcache *regcache = get_thread_regcache (wait_ptid); |
1184 | ||
1185 | if (breakpoint_here_p (regcache_read_pc (regcache))) | |
ea67f13b | 1186 | { |
515630c5 UW |
1187 | /* If stepping, remember current thread to switch back to. */ |
1188 | if (step) | |
1189 | deferred_step_ptid = inferior_ptid; | |
ea67f13b | 1190 | |
515630c5 UW |
1191 | /* Switch back to WAIT_PID thread. */ |
1192 | switch_to_thread (wait_ptid); | |
6a6b96b9 | 1193 | |
515630c5 UW |
1194 | /* We return 1 to indicate that there is a breakpoint here, |
1195 | so we need to step over it before continuing to avoid | |
1196 | hitting it straight away. */ | |
1197 | return 1; | |
1198 | } | |
ea67f13b DJ |
1199 | } |
1200 | ||
1201 | return 0; | |
ea67f13b | 1202 | } |
e4846b08 JJ |
1203 | |
1204 | /* Record the pc of the program the last time it stopped. This is | |
1205 | just used internally by wait_for_inferior, but need to be preserved | |
1206 | over calls to it and cleared when the inferior is started. */ | |
1207 | static CORE_ADDR prev_pc; | |
1208 | ||
c906108c SS |
1209 | /* Basic routine for continuing the program in various fashions. |
1210 | ||
1211 | ADDR is the address to resume at, or -1 for resume where stopped. | |
1212 | SIGGNAL is the signal to give it, or 0 for none, | |
c5aa993b | 1213 | or -1 for act according to how it stopped. |
c906108c | 1214 | STEP is nonzero if should trap after one instruction. |
c5aa993b JM |
1215 | -1 means return after that and print nothing. |
1216 | You should probably set various step_... variables | |
1217 | before calling here, if you are stepping. | |
c906108c SS |
1218 | |
1219 | You should call clear_proceed_status before calling proceed. */ | |
1220 | ||
1221 | void | |
96baa820 | 1222 | proceed (CORE_ADDR addr, enum target_signal siggnal, int step) |
c906108c | 1223 | { |
515630c5 UW |
1224 | struct regcache *regcache = get_current_regcache (); |
1225 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1226 | CORE_ADDR pc = regcache_read_pc (regcache); | |
c906108c SS |
1227 | int oneproc = 0; |
1228 | ||
1229 | if (step > 0) | |
515630c5 | 1230 | step_start_function = find_pc_function (pc); |
c906108c SS |
1231 | if (step < 0) |
1232 | stop_after_trap = 1; | |
1233 | ||
2acceee2 | 1234 | if (addr == (CORE_ADDR) -1) |
c906108c | 1235 | { |
515630c5 | 1236 | if (pc == stop_pc && breakpoint_here_p (pc)) |
3352ef37 AC |
1237 | /* There is a breakpoint at the address we will resume at, |
1238 | step one instruction before inserting breakpoints so that | |
1239 | we do not stop right away (and report a second hit at this | |
1240 | breakpoint). */ | |
c906108c | 1241 | oneproc = 1; |
515630c5 UW |
1242 | else if (gdbarch_single_step_through_delay_p (gdbarch) |
1243 | && gdbarch_single_step_through_delay (gdbarch, | |
1244 | get_current_frame ())) | |
3352ef37 AC |
1245 | /* We stepped onto an instruction that needs to be stepped |
1246 | again before re-inserting the breakpoint, do so. */ | |
c906108c SS |
1247 | oneproc = 1; |
1248 | } | |
1249 | else | |
1250 | { | |
515630c5 | 1251 | regcache_write_pc (regcache, addr); |
c906108c SS |
1252 | } |
1253 | ||
527159b7 | 1254 | if (debug_infrun) |
8a9de0e4 AC |
1255 | fprintf_unfiltered (gdb_stdlog, |
1256 | "infrun: proceed (addr=0x%s, signal=%d, step=%d)\n", | |
1257 | paddr_nz (addr), siggnal, step); | |
527159b7 | 1258 | |
94cc34af PA |
1259 | if (non_stop) |
1260 | /* In non-stop, each thread is handled individually. The context | |
1261 | must already be set to the right thread here. */ | |
1262 | ; | |
1263 | else | |
1264 | { | |
1265 | /* In a multi-threaded task we may select another thread and | |
1266 | then continue or step. | |
c906108c | 1267 | |
94cc34af PA |
1268 | But if the old thread was stopped at a breakpoint, it will |
1269 | immediately cause another breakpoint stop without any | |
1270 | execution (i.e. it will report a breakpoint hit incorrectly). | |
1271 | So we must step over it first. | |
c906108c | 1272 | |
94cc34af PA |
1273 | prepare_to_proceed checks the current thread against the |
1274 | thread that reported the most recent event. If a step-over | |
1275 | is required it returns TRUE and sets the current thread to | |
1276 | the old thread. */ | |
1277 | if (prepare_to_proceed (step)) | |
1278 | oneproc = 1; | |
1279 | } | |
c906108c | 1280 | |
c906108c | 1281 | if (oneproc) |
74960c60 | 1282 | { |
74960c60 | 1283 | stepping_over_breakpoint = 1; |
237fc4c9 PA |
1284 | /* If displaced stepping is enabled, we can step over the |
1285 | breakpoint without hitting it, so leave all breakpoints | |
1286 | inserted. Otherwise we need to disable all breakpoints, step | |
1287 | one instruction, and then re-add them when that step is | |
1288 | finished. */ | |
515630c5 | 1289 | if (!use_displaced_stepping (gdbarch)) |
237fc4c9 | 1290 | remove_breakpoints (); |
74960c60 | 1291 | } |
237fc4c9 PA |
1292 | |
1293 | /* We can insert breakpoints if we're not trying to step over one, | |
1294 | or if we are stepping over one but we're using displaced stepping | |
1295 | to do so. */ | |
515630c5 | 1296 | if (! stepping_over_breakpoint || use_displaced_stepping (gdbarch)) |
c36b740a | 1297 | insert_breakpoints (); |
c906108c SS |
1298 | |
1299 | if (siggnal != TARGET_SIGNAL_DEFAULT) | |
1300 | stop_signal = siggnal; | |
1301 | /* If this signal should not be seen by program, | |
1302 | give it zero. Used for debugging signals. */ | |
1303 | else if (!signal_program[stop_signal]) | |
1304 | stop_signal = TARGET_SIGNAL_0; | |
1305 | ||
1306 | annotate_starting (); | |
1307 | ||
1308 | /* Make sure that output from GDB appears before output from the | |
1309 | inferior. */ | |
1310 | gdb_flush (gdb_stdout); | |
1311 | ||
e4846b08 JJ |
1312 | /* Refresh prev_pc value just prior to resuming. This used to be |
1313 | done in stop_stepping, however, setting prev_pc there did not handle | |
1314 | scenarios such as inferior function calls or returning from | |
1315 | a function via the return command. In those cases, the prev_pc | |
1316 | value was not set properly for subsequent commands. The prev_pc value | |
1317 | is used to initialize the starting line number in the ecs. With an | |
1318 | invalid value, the gdb next command ends up stopping at the position | |
1319 | represented by the next line table entry past our start position. | |
1320 | On platforms that generate one line table entry per line, this | |
1321 | is not a problem. However, on the ia64, the compiler generates | |
1322 | extraneous line table entries that do not increase the line number. | |
1323 | When we issue the gdb next command on the ia64 after an inferior call | |
1324 | or a return command, we often end up a few instructions forward, still | |
1325 | within the original line we started. | |
1326 | ||
1327 | An attempt was made to have init_execution_control_state () refresh | |
1328 | the prev_pc value before calculating the line number. This approach | |
1329 | did not work because on platforms that use ptrace, the pc register | |
1330 | cannot be read unless the inferior is stopped. At that point, we | |
515630c5 | 1331 | are not guaranteed the inferior is stopped and so the regcache_read_pc () |
e4846b08 | 1332 | call can fail. Setting the prev_pc value here ensures the value is |
8fb3e588 | 1333 | updated correctly when the inferior is stopped. */ |
515630c5 | 1334 | prev_pc = regcache_read_pc (get_current_regcache ()); |
e4846b08 | 1335 | |
59f0d5d9 PA |
1336 | /* Fill in with reasonable starting values. */ |
1337 | init_thread_stepping_state (tss); | |
1338 | ||
1339 | /* We'll update this if & when we switch to a new thread. */ | |
1340 | previous_inferior_ptid = inferior_ptid; | |
1341 | ||
1342 | /* Reset to normal state. */ | |
1343 | init_infwait_state (); | |
1344 | ||
c906108c SS |
1345 | /* Resume inferior. */ |
1346 | resume (oneproc || step || bpstat_should_step (), stop_signal); | |
1347 | ||
1348 | /* Wait for it to stop (if not standalone) | |
1349 | and in any case decode why it stopped, and act accordingly. */ | |
43ff13b4 JM |
1350 | /* Do this only if we are not using the event loop, or if the target |
1351 | does not support asynchronous execution. */ | |
362646f5 | 1352 | if (!target_can_async_p ()) |
43ff13b4 | 1353 | { |
ae123ec6 | 1354 | wait_for_inferior (0); |
43ff13b4 JM |
1355 | normal_stop (); |
1356 | } | |
c906108c | 1357 | } |
c906108c SS |
1358 | \f |
1359 | ||
1360 | /* Start remote-debugging of a machine over a serial link. */ | |
96baa820 | 1361 | |
c906108c | 1362 | void |
8621d6a9 | 1363 | start_remote (int from_tty) |
c906108c | 1364 | { |
c906108c | 1365 | init_wait_for_inferior (); |
b0f4b84b | 1366 | stop_soon = STOP_QUIETLY_REMOTE; |
ca67fcb8 | 1367 | stepping_over_breakpoint = 0; |
43ff13b4 | 1368 | |
6426a772 JM |
1369 | /* Always go on waiting for the target, regardless of the mode. */ |
1370 | /* FIXME: cagney/1999-09-23: At present it isn't possible to | |
7e73cedf | 1371 | indicate to wait_for_inferior that a target should timeout if |
6426a772 JM |
1372 | nothing is returned (instead of just blocking). Because of this, |
1373 | targets expecting an immediate response need to, internally, set | |
1374 | things up so that the target_wait() is forced to eventually | |
1375 | timeout. */ | |
1376 | /* FIXME: cagney/1999-09-24: It isn't possible for target_open() to | |
1377 | differentiate to its caller what the state of the target is after | |
1378 | the initial open has been performed. Here we're assuming that | |
1379 | the target has stopped. It should be possible to eventually have | |
1380 | target_open() return to the caller an indication that the target | |
1381 | is currently running and GDB state should be set to the same as | |
1382 | for an async run. */ | |
ae123ec6 | 1383 | wait_for_inferior (0); |
8621d6a9 DJ |
1384 | |
1385 | /* Now that the inferior has stopped, do any bookkeeping like | |
1386 | loading shared libraries. We want to do this before normal_stop, | |
1387 | so that the displayed frame is up to date. */ | |
1388 | post_create_inferior (¤t_target, from_tty); | |
1389 | ||
6426a772 | 1390 | normal_stop (); |
c906108c SS |
1391 | } |
1392 | ||
1393 | /* Initialize static vars when a new inferior begins. */ | |
1394 | ||
1395 | void | |
96baa820 | 1396 | init_wait_for_inferior (void) |
c906108c SS |
1397 | { |
1398 | /* These are meaningless until the first time through wait_for_inferior. */ | |
1399 | prev_pc = 0; | |
c906108c | 1400 | |
c906108c SS |
1401 | breakpoint_init_inferior (inf_starting); |
1402 | ||
1403 | /* Don't confuse first call to proceed(). */ | |
1404 | stop_signal = TARGET_SIGNAL_0; | |
1405 | ||
1406 | /* The first resume is not following a fork/vfork/exec. */ | |
1407 | pending_follow.kind = TARGET_WAITKIND_SPURIOUS; /* I.e., none. */ | |
c906108c | 1408 | |
c906108c | 1409 | clear_proceed_status (); |
9f976b41 DJ |
1410 | |
1411 | stepping_past_singlestep_breakpoint = 0; | |
ca67fcb8 | 1412 | deferred_step_ptid = null_ptid; |
ca005067 DJ |
1413 | |
1414 | target_last_wait_ptid = minus_one_ptid; | |
237fc4c9 | 1415 | |
0d1e5fa7 PA |
1416 | init_thread_stepping_state (tss); |
1417 | previous_inferior_ptid = null_ptid; | |
1418 | init_infwait_state (); | |
1419 | ||
237fc4c9 | 1420 | displaced_step_clear (); |
c906108c | 1421 | } |
237fc4c9 | 1422 | |
c906108c | 1423 | \f |
b83266a0 SS |
1424 | /* This enum encodes possible reasons for doing a target_wait, so that |
1425 | wfi can call target_wait in one place. (Ultimately the call will be | |
1426 | moved out of the infinite loop entirely.) */ | |
1427 | ||
c5aa993b JM |
1428 | enum infwait_states |
1429 | { | |
cd0fc7c3 SS |
1430 | infwait_normal_state, |
1431 | infwait_thread_hop_state, | |
d983da9c | 1432 | infwait_step_watch_state, |
cd0fc7c3 | 1433 | infwait_nonstep_watch_state |
b83266a0 SS |
1434 | }; |
1435 | ||
11cf8741 JM |
1436 | /* Why did the inferior stop? Used to print the appropriate messages |
1437 | to the interface from within handle_inferior_event(). */ | |
1438 | enum inferior_stop_reason | |
1439 | { | |
11cf8741 JM |
1440 | /* Step, next, nexti, stepi finished. */ |
1441 | END_STEPPING_RANGE, | |
11cf8741 JM |
1442 | /* Inferior terminated by signal. */ |
1443 | SIGNAL_EXITED, | |
1444 | /* Inferior exited. */ | |
1445 | EXITED, | |
1446 | /* Inferior received signal, and user asked to be notified. */ | |
1447 | SIGNAL_RECEIVED | |
1448 | }; | |
1449 | ||
0d1e5fa7 PA |
1450 | /* The PTID we'll do a target_wait on.*/ |
1451 | ptid_t waiton_ptid; | |
1452 | ||
1453 | /* Current inferior wait state. */ | |
1454 | enum infwait_states infwait_state; | |
cd0fc7c3 | 1455 | |
0d1e5fa7 PA |
1456 | /* Data to be passed around while handling an event. This data is |
1457 | discarded between events. */ | |
c5aa993b | 1458 | struct execution_control_state |
488f131b | 1459 | { |
0d1e5fa7 | 1460 | ptid_t ptid; |
488f131b | 1461 | struct target_waitstatus ws; |
488f131b JB |
1462 | int random_signal; |
1463 | CORE_ADDR stop_func_start; | |
1464 | CORE_ADDR stop_func_end; | |
1465 | char *stop_func_name; | |
488f131b | 1466 | int new_thread_event; |
488f131b JB |
1467 | int wait_some_more; |
1468 | }; | |
1469 | ||
1470 | void init_execution_control_state (struct execution_control_state *ecs); | |
1471 | ||
1472 | void handle_inferior_event (struct execution_control_state *ecs); | |
cd0fc7c3 | 1473 | |
c2c6d25f | 1474 | static void step_into_function (struct execution_control_state *ecs); |
44cbf7b5 | 1475 | static void insert_step_resume_breakpoint_at_frame (struct frame_info *step_frame); |
14e60db5 | 1476 | static void insert_step_resume_breakpoint_at_caller (struct frame_info *); |
44cbf7b5 AC |
1477 | static void insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, |
1478 | struct frame_id sr_id); | |
611c83ae PA |
1479 | static void insert_longjmp_resume_breakpoint (CORE_ADDR); |
1480 | ||
104c1213 JM |
1481 | static void stop_stepping (struct execution_control_state *ecs); |
1482 | static void prepare_to_wait (struct execution_control_state *ecs); | |
d4f3574e | 1483 | static void keep_going (struct execution_control_state *ecs); |
488f131b JB |
1484 | static void print_stop_reason (enum inferior_stop_reason stop_reason, |
1485 | int stop_info); | |
104c1213 | 1486 | |
cd0fc7c3 | 1487 | /* Wait for control to return from inferior to debugger. |
ae123ec6 JB |
1488 | |
1489 | If TREAT_EXEC_AS_SIGTRAP is non-zero, then handle EXEC signals | |
1490 | as if they were SIGTRAP signals. This can be useful during | |
1491 | the startup sequence on some targets such as HP/UX, where | |
1492 | we receive an EXEC event instead of the expected SIGTRAP. | |
1493 | ||
cd0fc7c3 SS |
1494 | If inferior gets a signal, we may decide to start it up again |
1495 | instead of returning. That is why there is a loop in this function. | |
1496 | When this function actually returns it means the inferior | |
1497 | should be left stopped and GDB should read more commands. */ | |
1498 | ||
1499 | void | |
ae123ec6 | 1500 | wait_for_inferior (int treat_exec_as_sigtrap) |
cd0fc7c3 SS |
1501 | { |
1502 | struct cleanup *old_cleanups; | |
0d1e5fa7 | 1503 | struct execution_control_state ecss; |
cd0fc7c3 | 1504 | struct execution_control_state *ecs; |
c906108c | 1505 | |
527159b7 | 1506 | if (debug_infrun) |
ae123ec6 JB |
1507 | fprintf_unfiltered |
1508 | (gdb_stdlog, "infrun: wait_for_inferior (treat_exec_as_sigtrap=%d)\n", | |
1509 | treat_exec_as_sigtrap); | |
527159b7 | 1510 | |
8601f500 | 1511 | old_cleanups = make_cleanup (delete_step_resume_breakpoint, |
c906108c | 1512 | &step_resume_breakpoint); |
cd0fc7c3 | 1513 | |
cd0fc7c3 | 1514 | ecs = &ecss; |
0d1e5fa7 PA |
1515 | memset (ecs, 0, sizeof (*ecs)); |
1516 | ||
cd0fc7c3 SS |
1517 | overlay_cache_invalid = 1; |
1518 | ||
1519 | /* We have to invalidate the registers BEFORE calling target_wait | |
1520 | because they can be loaded from the target while in target_wait. | |
1521 | This makes remote debugging a bit more efficient for those | |
1522 | targets that provide critical registers as part of their normal | |
1523 | status mechanism. */ | |
1524 | ||
1525 | registers_changed (); | |
b83266a0 | 1526 | |
c906108c SS |
1527 | while (1) |
1528 | { | |
9a4105ab | 1529 | if (deprecated_target_wait_hook) |
0d1e5fa7 | 1530 | ecs->ptid = deprecated_target_wait_hook (waiton_ptid, &ecs->ws); |
cd0fc7c3 | 1531 | else |
0d1e5fa7 | 1532 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws); |
c906108c | 1533 | |
ae123ec6 JB |
1534 | if (treat_exec_as_sigtrap && ecs->ws.kind == TARGET_WAITKIND_EXECD) |
1535 | { | |
1536 | xfree (ecs->ws.value.execd_pathname); | |
1537 | ecs->ws.kind = TARGET_WAITKIND_STOPPED; | |
1538 | ecs->ws.value.sig = TARGET_SIGNAL_TRAP; | |
1539 | } | |
1540 | ||
cd0fc7c3 SS |
1541 | /* Now figure out what to do with the result of the result. */ |
1542 | handle_inferior_event (ecs); | |
c906108c | 1543 | |
cd0fc7c3 SS |
1544 | if (!ecs->wait_some_more) |
1545 | break; | |
1546 | } | |
1547 | do_cleanups (old_cleanups); | |
1548 | } | |
c906108c | 1549 | |
43ff13b4 JM |
1550 | /* Asynchronous version of wait_for_inferior. It is called by the |
1551 | event loop whenever a change of state is detected on the file | |
1552 | descriptor corresponding to the target. It can be called more than | |
1553 | once to complete a single execution command. In such cases we need | |
a474d7c2 PA |
1554 | to keep the state in a global variable ECSS. If it is the last time |
1555 | that this function is called for a single execution command, then | |
1556 | report to the user that the inferior has stopped, and do the | |
1557 | necessary cleanups. */ | |
43ff13b4 JM |
1558 | |
1559 | void | |
fba45db2 | 1560 | fetch_inferior_event (void *client_data) |
43ff13b4 | 1561 | { |
0d1e5fa7 | 1562 | struct execution_control_state ecss; |
a474d7c2 | 1563 | struct execution_control_state *ecs = &ecss; |
4f8d22e3 PA |
1564 | struct cleanup *old_chain = make_cleanup (null_cleanup, NULL); |
1565 | int was_sync = sync_execution; | |
43ff13b4 | 1566 | |
0d1e5fa7 PA |
1567 | memset (ecs, 0, sizeof (*ecs)); |
1568 | ||
59f0d5d9 | 1569 | overlay_cache_invalid = 1; |
43ff13b4 | 1570 | |
4f8d22e3 PA |
1571 | if (non_stop) |
1572 | /* In non-stop mode, the user/frontend should not notice a thread | |
1573 | switch due to internal events. Make sure we reverse to the | |
1574 | user selected thread and frame after handling the event and | |
1575 | running any breakpoint commands. */ | |
1576 | make_cleanup_restore_current_thread (); | |
1577 | ||
59f0d5d9 PA |
1578 | /* We have to invalidate the registers BEFORE calling target_wait |
1579 | because they can be loaded from the target while in target_wait. | |
1580 | This makes remote debugging a bit more efficient for those | |
1581 | targets that provide critical registers as part of their normal | |
1582 | status mechanism. */ | |
43ff13b4 | 1583 | |
59f0d5d9 | 1584 | registers_changed (); |
43ff13b4 | 1585 | |
9a4105ab | 1586 | if (deprecated_target_wait_hook) |
a474d7c2 | 1587 | ecs->ptid = |
0d1e5fa7 | 1588 | deprecated_target_wait_hook (waiton_ptid, &ecs->ws); |
43ff13b4 | 1589 | else |
0d1e5fa7 | 1590 | ecs->ptid = target_wait (waiton_ptid, &ecs->ws); |
43ff13b4 | 1591 | |
94cc34af PA |
1592 | if (non_stop |
1593 | && ecs->ws.kind != TARGET_WAITKIND_IGNORE | |
1594 | && ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1595 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED) | |
1596 | /* In non-stop mode, each thread is handled individually. Switch | |
1597 | early, so the global state is set correctly for this | |
1598 | thread. */ | |
1599 | context_switch (ecs->ptid); | |
1600 | ||
43ff13b4 | 1601 | /* Now figure out what to do with the result of the result. */ |
a474d7c2 | 1602 | handle_inferior_event (ecs); |
43ff13b4 | 1603 | |
a474d7c2 | 1604 | if (!ecs->wait_some_more) |
43ff13b4 | 1605 | { |
f107f563 VP |
1606 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
1607 | ||
83c265ab PA |
1608 | if (stop_soon == NO_STOP_QUIETLY) |
1609 | normal_stop (); | |
1610 | ||
c2d11a7d JM |
1611 | if (step_multi && stop_step) |
1612 | inferior_event_handler (INF_EXEC_CONTINUE, NULL); | |
1613 | else | |
1614 | inferior_event_handler (INF_EXEC_COMPLETE, NULL); | |
43ff13b4 | 1615 | } |
4f8d22e3 PA |
1616 | |
1617 | /* Revert thread and frame. */ | |
1618 | do_cleanups (old_chain); | |
1619 | ||
1620 | /* If the inferior was in sync execution mode, and now isn't, | |
1621 | restore the prompt. */ | |
1622 | if (was_sync && !sync_execution) | |
1623 | display_gdb_prompt (0); | |
43ff13b4 JM |
1624 | } |
1625 | ||
cd0fc7c3 SS |
1626 | /* Prepare an execution control state for looping through a |
1627 | wait_for_inferior-type loop. */ | |
1628 | ||
1629 | void | |
96baa820 | 1630 | init_execution_control_state (struct execution_control_state *ecs) |
cd0fc7c3 SS |
1631 | { |
1632 | ecs->random_signal = 0; | |
0d1e5fa7 PA |
1633 | } |
1634 | ||
1635 | /* Clear context switchable stepping state. */ | |
1636 | ||
1637 | void | |
1638 | init_thread_stepping_state (struct thread_stepping_state *tss) | |
1639 | { | |
2afb61aa PA |
1640 | struct symtab_and_line sal; |
1641 | ||
0d1e5fa7 PA |
1642 | tss->stepping_over_breakpoint = 0; |
1643 | tss->step_after_step_resume_breakpoint = 0; | |
1644 | tss->stepping_through_solib_after_catch = 0; | |
1645 | tss->stepping_through_solib_catchpoints = NULL; | |
2afb61aa PA |
1646 | |
1647 | sal = find_pc_line (prev_pc, 0); | |
1648 | tss->current_line = sal.line; | |
1649 | tss->current_symtab = sal.symtab; | |
cd0fc7c3 SS |
1650 | } |
1651 | ||
e02bc4cc | 1652 | /* Return the cached copy of the last pid/waitstatus returned by |
9a4105ab AC |
1653 | target_wait()/deprecated_target_wait_hook(). The data is actually |
1654 | cached by handle_inferior_event(), which gets called immediately | |
1655 | after target_wait()/deprecated_target_wait_hook(). */ | |
e02bc4cc DS |
1656 | |
1657 | void | |
488f131b | 1658 | get_last_target_status (ptid_t *ptidp, struct target_waitstatus *status) |
e02bc4cc | 1659 | { |
39f77062 | 1660 | *ptidp = target_last_wait_ptid; |
e02bc4cc DS |
1661 | *status = target_last_waitstatus; |
1662 | } | |
1663 | ||
ac264b3b MS |
1664 | void |
1665 | nullify_last_target_wait_ptid (void) | |
1666 | { | |
1667 | target_last_wait_ptid = minus_one_ptid; | |
1668 | } | |
1669 | ||
dd80620e MS |
1670 | /* Switch thread contexts, maintaining "infrun state". */ |
1671 | ||
1672 | static void | |
0d1e5fa7 | 1673 | context_switch (ptid_t ptid) |
dd80620e MS |
1674 | { |
1675 | /* Caution: it may happen that the new thread (or the old one!) | |
1676 | is not in the thread list. In this case we must not attempt | |
1677 | to "switch context", or we run the risk that our context may | |
1678 | be lost. This may happen as a result of the target module | |
1679 | mishandling thread creation. */ | |
1680 | ||
fd48f117 DJ |
1681 | if (debug_infrun) |
1682 | { | |
1683 | fprintf_unfiltered (gdb_stdlog, "infrun: Switching context from %s ", | |
1684 | target_pid_to_str (inferior_ptid)); | |
1685 | fprintf_unfiltered (gdb_stdlog, "to %s\n", | |
0d1e5fa7 | 1686 | target_pid_to_str (ptid)); |
fd48f117 DJ |
1687 | } |
1688 | ||
0d1e5fa7 | 1689 | if (in_thread_list (inferior_ptid) && in_thread_list (ptid)) |
488f131b | 1690 | { /* Perform infrun state context switch: */ |
dd80620e | 1691 | /* Save infrun state for the old thread. */ |
0ce3d317 | 1692 | save_infrun_state (inferior_ptid, prev_pc, |
ca67fcb8 | 1693 | stepping_over_breakpoint, step_resume_breakpoint, |
15960608 | 1694 | step_range_start, |
aa0cd9c1 | 1695 | step_range_end, &step_frame_id, |
0d1e5fa7 PA |
1696 | tss->stepping_over_breakpoint, |
1697 | tss->stepping_through_solib_after_catch, | |
1698 | tss->stepping_through_solib_catchpoints, | |
1699 | tss->current_line, tss->current_symtab, | |
a474d7c2 PA |
1700 | cmd_continuation, intermediate_continuation, |
1701 | proceed_to_finish, | |
1702 | step_over_calls, | |
1703 | stop_step, | |
1704 | step_multi, | |
1705 | stop_signal, | |
1706 | stop_bpstat); | |
dd80620e MS |
1707 | |
1708 | /* Load infrun state for the new thread. */ | |
0d1e5fa7 | 1709 | load_infrun_state (ptid, &prev_pc, |
ca67fcb8 | 1710 | &stepping_over_breakpoint, &step_resume_breakpoint, |
15960608 | 1711 | &step_range_start, |
aa0cd9c1 | 1712 | &step_range_end, &step_frame_id, |
0d1e5fa7 PA |
1713 | &tss->stepping_over_breakpoint, |
1714 | &tss->stepping_through_solib_after_catch, | |
1715 | &tss->stepping_through_solib_catchpoints, | |
1716 | &tss->current_line, &tss->current_symtab, | |
a474d7c2 PA |
1717 | &cmd_continuation, &intermediate_continuation, |
1718 | &proceed_to_finish, | |
1719 | &step_over_calls, | |
1720 | &stop_step, | |
1721 | &step_multi, | |
1722 | &stop_signal, | |
1723 | &stop_bpstat); | |
dd80620e | 1724 | } |
6a6b96b9 | 1725 | |
0d1e5fa7 | 1726 | switch_to_thread (ptid); |
dd80620e MS |
1727 | } |
1728 | ||
a474d7c2 PA |
1729 | /* Context switch to thread PTID. */ |
1730 | ptid_t | |
1731 | context_switch_to (ptid_t ptid) | |
1732 | { | |
1733 | ptid_t current_ptid = inferior_ptid; | |
1734 | ||
1735 | /* Context switch to the new thread. */ | |
1736 | if (!ptid_equal (ptid, inferior_ptid)) | |
1737 | { | |
0d1e5fa7 | 1738 | context_switch (ptid); |
a474d7c2 PA |
1739 | } |
1740 | return current_ptid; | |
1741 | } | |
1742 | ||
4fa8626c DJ |
1743 | static void |
1744 | adjust_pc_after_break (struct execution_control_state *ecs) | |
1745 | { | |
515630c5 UW |
1746 | struct regcache *regcache = get_thread_regcache (ecs->ptid); |
1747 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
8aad930b | 1748 | CORE_ADDR breakpoint_pc; |
4fa8626c DJ |
1749 | |
1750 | /* If this target does not decrement the PC after breakpoints, then | |
1751 | we have nothing to do. */ | |
515630c5 | 1752 | if (gdbarch_decr_pc_after_break (gdbarch) == 0) |
4fa8626c DJ |
1753 | return; |
1754 | ||
1755 | /* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If | |
1756 | we aren't, just return. | |
9709f61c DJ |
1757 | |
1758 | We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not | |
b798847d UW |
1759 | affected by gdbarch_decr_pc_after_break. Other waitkinds which are |
1760 | implemented by software breakpoints should be handled through the normal | |
1761 | breakpoint layer. | |
8fb3e588 | 1762 | |
4fa8626c DJ |
1763 | NOTE drow/2004-01-31: On some targets, breakpoints may generate |
1764 | different signals (SIGILL or SIGEMT for instance), but it is less | |
1765 | clear where the PC is pointing afterwards. It may not match | |
b798847d UW |
1766 | gdbarch_decr_pc_after_break. I don't know any specific target that |
1767 | generates these signals at breakpoints (the code has been in GDB since at | |
1768 | least 1992) so I can not guess how to handle them here. | |
8fb3e588 | 1769 | |
e6cf7916 UW |
1770 | In earlier versions of GDB, a target with |
1771 | gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a | |
b798847d UW |
1772 | watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any |
1773 | target with both of these set in GDB history, and it seems unlikely to be | |
1774 | correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */ | |
4fa8626c DJ |
1775 | |
1776 | if (ecs->ws.kind != TARGET_WAITKIND_STOPPED) | |
1777 | return; | |
1778 | ||
1779 | if (ecs->ws.value.sig != TARGET_SIGNAL_TRAP) | |
1780 | return; | |
1781 | ||
8aad930b AC |
1782 | /* Find the location where (if we've hit a breakpoint) the |
1783 | breakpoint would be. */ | |
515630c5 UW |
1784 | breakpoint_pc = regcache_read_pc (regcache) |
1785 | - gdbarch_decr_pc_after_break (gdbarch); | |
8aad930b | 1786 | |
1c0fdd0e UW |
1787 | /* Check whether there actually is a software breakpoint inserted |
1788 | at that location. */ | |
1789 | if (software_breakpoint_inserted_here_p (breakpoint_pc)) | |
8aad930b | 1790 | { |
1c0fdd0e UW |
1791 | /* When using hardware single-step, a SIGTRAP is reported for both |
1792 | a completed single-step and a software breakpoint. Need to | |
1793 | differentiate between the two, as the latter needs adjusting | |
1794 | but the former does not. | |
1795 | ||
1796 | The SIGTRAP can be due to a completed hardware single-step only if | |
1797 | - we didn't insert software single-step breakpoints | |
1798 | - the thread to be examined is still the current thread | |
1799 | - this thread is currently being stepped | |
1800 | ||
1801 | If any of these events did not occur, we must have stopped due | |
1802 | to hitting a software breakpoint, and have to back up to the | |
1803 | breakpoint address. | |
1804 | ||
1805 | As a special case, we could have hardware single-stepped a | |
1806 | software breakpoint. In this case (prev_pc == breakpoint_pc), | |
1807 | we also need to back up to the breakpoint address. */ | |
1808 | ||
1809 | if (singlestep_breakpoints_inserted_p | |
1810 | || !ptid_equal (ecs->ptid, inferior_ptid) | |
0d1e5fa7 | 1811 | || !currently_stepping (tss) |
1c0fdd0e | 1812 | || prev_pc == breakpoint_pc) |
515630c5 | 1813 | regcache_write_pc (regcache, breakpoint_pc); |
8aad930b | 1814 | } |
4fa8626c DJ |
1815 | } |
1816 | ||
0d1e5fa7 PA |
1817 | void |
1818 | init_infwait_state (void) | |
1819 | { | |
1820 | waiton_ptid = pid_to_ptid (-1); | |
1821 | infwait_state = infwait_normal_state; | |
1822 | } | |
1823 | ||
94cc34af PA |
1824 | void |
1825 | error_is_running (void) | |
1826 | { | |
1827 | error (_("\ | |
1828 | Cannot execute this command while the selected thread is running.")); | |
1829 | } | |
1830 | ||
1831 | void | |
1832 | ensure_not_running (void) | |
1833 | { | |
1834 | if (is_running (inferior_ptid)) | |
1835 | error_is_running (); | |
1836 | } | |
1837 | ||
cd0fc7c3 SS |
1838 | /* Given an execution control state that has been freshly filled in |
1839 | by an event from the inferior, figure out what it means and take | |
1840 | appropriate action. */ | |
c906108c | 1841 | |
cd0fc7c3 | 1842 | void |
96baa820 | 1843 | handle_inferior_event (struct execution_control_state *ecs) |
cd0fc7c3 | 1844 | { |
c8edd8b4 | 1845 | int sw_single_step_trap_p = 0; |
d983da9c DJ |
1846 | int stopped_by_watchpoint; |
1847 | int stepped_after_stopped_by_watchpoint = 0; | |
2afb61aa | 1848 | struct symtab_and_line stop_pc_sal; |
cd0fc7c3 | 1849 | |
20874c92 VP |
1850 | breakpoint_retire_moribund (); |
1851 | ||
e02bc4cc | 1852 | /* Cache the last pid/waitstatus. */ |
39f77062 | 1853 | target_last_wait_ptid = ecs->ptid; |
0d1e5fa7 | 1854 | target_last_waitstatus = ecs->ws; |
e02bc4cc | 1855 | |
ca005067 DJ |
1856 | /* Always clear state belonging to the previous time we stopped. */ |
1857 | stop_stack_dummy = 0; | |
1858 | ||
4fa8626c DJ |
1859 | adjust_pc_after_break (ecs); |
1860 | ||
8c90c137 LM |
1861 | reinit_frame_cache (); |
1862 | ||
1863 | /* If it's a new process, add it to the thread database */ | |
1864 | ||
1865 | ecs->new_thread_event = (!ptid_equal (ecs->ptid, inferior_ptid) | |
1866 | && !ptid_equal (ecs->ptid, minus_one_ptid) | |
1867 | && !in_thread_list (ecs->ptid)); | |
1868 | ||
1869 | if (ecs->ws.kind != TARGET_WAITKIND_EXITED | |
1870 | && ecs->ws.kind != TARGET_WAITKIND_SIGNALLED && ecs->new_thread_event) | |
1871 | add_thread (ecs->ptid); | |
1872 | ||
1873 | if (ecs->ws.kind != TARGET_WAITKIND_IGNORE) | |
1874 | { | |
1875 | /* Mark the non-executing threads accordingly. */ | |
1876 | if (!non_stop | |
1877 | || ecs->ws.kind == TARGET_WAITKIND_EXITED | |
1878 | || ecs->ws.kind == TARGET_WAITKIND_SIGNALLED) | |
1879 | set_executing (pid_to_ptid (-1), 0); | |
1880 | else | |
1881 | set_executing (ecs->ptid, 0); | |
1882 | } | |
1883 | ||
0d1e5fa7 | 1884 | switch (infwait_state) |
488f131b JB |
1885 | { |
1886 | case infwait_thread_hop_state: | |
527159b7 | 1887 | if (debug_infrun) |
8a9de0e4 | 1888 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_thread_hop_state\n"); |
488f131b | 1889 | /* Cancel the waiton_ptid. */ |
0d1e5fa7 | 1890 | waiton_ptid = pid_to_ptid (-1); |
65e82032 | 1891 | break; |
b83266a0 | 1892 | |
488f131b | 1893 | case infwait_normal_state: |
527159b7 | 1894 | if (debug_infrun) |
8a9de0e4 | 1895 | fprintf_unfiltered (gdb_stdlog, "infrun: infwait_normal_state\n"); |
d983da9c DJ |
1896 | break; |
1897 | ||
1898 | case infwait_step_watch_state: | |
1899 | if (debug_infrun) | |
1900 | fprintf_unfiltered (gdb_stdlog, | |
1901 | "infrun: infwait_step_watch_state\n"); | |
1902 | ||
1903 | stepped_after_stopped_by_watchpoint = 1; | |
488f131b | 1904 | break; |
b83266a0 | 1905 | |
488f131b | 1906 | case infwait_nonstep_watch_state: |
527159b7 | 1907 | if (debug_infrun) |
8a9de0e4 AC |
1908 | fprintf_unfiltered (gdb_stdlog, |
1909 | "infrun: infwait_nonstep_watch_state\n"); | |
488f131b | 1910 | insert_breakpoints (); |
c906108c | 1911 | |
488f131b JB |
1912 | /* FIXME-maybe: is this cleaner than setting a flag? Does it |
1913 | handle things like signals arriving and other things happening | |
1914 | in combination correctly? */ | |
1915 | stepped_after_stopped_by_watchpoint = 1; | |
1916 | break; | |
65e82032 AC |
1917 | |
1918 | default: | |
e2e0b3e5 | 1919 | internal_error (__FILE__, __LINE__, _("bad switch")); |
488f131b | 1920 | } |
0d1e5fa7 | 1921 | infwait_state = infwait_normal_state; |
c906108c | 1922 | |
488f131b JB |
1923 | switch (ecs->ws.kind) |
1924 | { | |
1925 | case TARGET_WAITKIND_LOADED: | |
527159b7 | 1926 | if (debug_infrun) |
8a9de0e4 | 1927 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_LOADED\n"); |
b0f4b84b DJ |
1928 | /* Ignore gracefully during startup of the inferior, as it might |
1929 | be the shell which has just loaded some objects, otherwise | |
1930 | add the symbols for the newly loaded objects. Also ignore at | |
1931 | the beginning of an attach or remote session; we will query | |
1932 | the full list of libraries once the connection is | |
1933 | established. */ | |
c0236d92 | 1934 | if (stop_soon == NO_STOP_QUIETLY) |
488f131b | 1935 | { |
488f131b JB |
1936 | /* Check for any newly added shared libraries if we're |
1937 | supposed to be adding them automatically. Switch | |
1938 | terminal for any messages produced by | |
1939 | breakpoint_re_set. */ | |
1940 | target_terminal_ours_for_output (); | |
aff6338a | 1941 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
1942 | stack's section table is kept up-to-date. Architectures, |
1943 | (e.g., PPC64), use the section table to perform | |
1944 | operations such as address => section name and hence | |
1945 | require the table to contain all sections (including | |
1946 | those found in shared libraries). */ | |
aff6338a | 1947 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
1948 | exec_ops to SOLIB_ADD. This is because current GDB is |
1949 | only tooled to propagate section_table changes out from | |
1950 | the "current_target" (see target_resize_to_sections), and | |
1951 | not up from the exec stratum. This, of course, isn't | |
1952 | right. "infrun.c" should only interact with the | |
1953 | exec/process stratum, instead relying on the target stack | |
1954 | to propagate relevant changes (stop, section table | |
1955 | changed, ...) up to other layers. */ | |
b0f4b84b | 1956 | #ifdef SOLIB_ADD |
aff6338a | 1957 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
b0f4b84b DJ |
1958 | #else |
1959 | solib_add (NULL, 0, ¤t_target, auto_solib_add); | |
1960 | #endif | |
488f131b JB |
1961 | target_terminal_inferior (); |
1962 | ||
b0f4b84b DJ |
1963 | /* If requested, stop when the dynamic linker notifies |
1964 | gdb of events. This allows the user to get control | |
1965 | and place breakpoints in initializer routines for | |
1966 | dynamically loaded objects (among other things). */ | |
1967 | if (stop_on_solib_events) | |
1968 | { | |
1969 | stop_stepping (ecs); | |
1970 | return; | |
1971 | } | |
1972 | ||
1973 | /* NOTE drow/2007-05-11: This might be a good place to check | |
1974 | for "catch load". */ | |
488f131b | 1975 | } |
b0f4b84b DJ |
1976 | |
1977 | /* If we are skipping through a shell, or through shared library | |
1978 | loading that we aren't interested in, resume the program. If | |
1979 | we're running the program normally, also resume. But stop if | |
1980 | we're attaching or setting up a remote connection. */ | |
1981 | if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY) | |
1982 | { | |
74960c60 VP |
1983 | /* Loading of shared libraries might have changed breakpoint |
1984 | addresses. Make sure new breakpoints are inserted. */ | |
0b02b92d UW |
1985 | if (stop_soon == NO_STOP_QUIETLY |
1986 | && !breakpoints_always_inserted_mode ()) | |
74960c60 | 1987 | insert_breakpoints (); |
b0f4b84b DJ |
1988 | resume (0, TARGET_SIGNAL_0); |
1989 | prepare_to_wait (ecs); | |
1990 | return; | |
1991 | } | |
1992 | ||
1993 | break; | |
c5aa993b | 1994 | |
488f131b | 1995 | case TARGET_WAITKIND_SPURIOUS: |
527159b7 | 1996 | if (debug_infrun) |
8a9de0e4 | 1997 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SPURIOUS\n"); |
488f131b JB |
1998 | resume (0, TARGET_SIGNAL_0); |
1999 | prepare_to_wait (ecs); | |
2000 | return; | |
c5aa993b | 2001 | |
488f131b | 2002 | case TARGET_WAITKIND_EXITED: |
527159b7 | 2003 | if (debug_infrun) |
8a9de0e4 | 2004 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXITED\n"); |
488f131b JB |
2005 | target_terminal_ours (); /* Must do this before mourn anyway */ |
2006 | print_stop_reason (EXITED, ecs->ws.value.integer); | |
2007 | ||
2008 | /* Record the exit code in the convenience variable $_exitcode, so | |
2009 | that the user can inspect this again later. */ | |
2010 | set_internalvar (lookup_internalvar ("_exitcode"), | |
2011 | value_from_longest (builtin_type_int, | |
2012 | (LONGEST) ecs->ws.value.integer)); | |
2013 | gdb_flush (gdb_stdout); | |
2014 | target_mourn_inferior (); | |
1c0fdd0e | 2015 | singlestep_breakpoints_inserted_p = 0; |
488f131b JB |
2016 | stop_print_frame = 0; |
2017 | stop_stepping (ecs); | |
2018 | return; | |
c5aa993b | 2019 | |
488f131b | 2020 | case TARGET_WAITKIND_SIGNALLED: |
527159b7 | 2021 | if (debug_infrun) |
8a9de0e4 | 2022 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SIGNALLED\n"); |
488f131b JB |
2023 | stop_print_frame = 0; |
2024 | stop_signal = ecs->ws.value.sig; | |
2025 | target_terminal_ours (); /* Must do this before mourn anyway */ | |
c5aa993b | 2026 | |
488f131b JB |
2027 | /* Note: By definition of TARGET_WAITKIND_SIGNALLED, we shouldn't |
2028 | reach here unless the inferior is dead. However, for years | |
2029 | target_kill() was called here, which hints that fatal signals aren't | |
2030 | really fatal on some systems. If that's true, then some changes | |
2031 | may be needed. */ | |
2032 | target_mourn_inferior (); | |
c906108c | 2033 | |
488f131b | 2034 | print_stop_reason (SIGNAL_EXITED, stop_signal); |
1c0fdd0e | 2035 | singlestep_breakpoints_inserted_p = 0; |
488f131b JB |
2036 | stop_stepping (ecs); |
2037 | return; | |
c906108c | 2038 | |
488f131b JB |
2039 | /* The following are the only cases in which we keep going; |
2040 | the above cases end in a continue or goto. */ | |
2041 | case TARGET_WAITKIND_FORKED: | |
deb3b17b | 2042 | case TARGET_WAITKIND_VFORKED: |
527159b7 | 2043 | if (debug_infrun) |
8a9de0e4 | 2044 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_FORKED\n"); |
488f131b JB |
2045 | stop_signal = TARGET_SIGNAL_TRAP; |
2046 | pending_follow.kind = ecs->ws.kind; | |
2047 | ||
3a3e9ee3 | 2048 | pending_follow.fork_event.parent_pid = ecs->ptid; |
8e7d2c16 | 2049 | pending_follow.fork_event.child_pid = ecs->ws.value.related_pid; |
c906108c | 2050 | |
5a2901d9 DJ |
2051 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
2052 | { | |
0d1e5fa7 | 2053 | context_switch (ecs->ptid); |
35f196d9 | 2054 | reinit_frame_cache (); |
5a2901d9 DJ |
2055 | } |
2056 | ||
488f131b | 2057 | stop_pc = read_pc (); |
675bf4cb | 2058 | |
d983da9c | 2059 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid); |
675bf4cb | 2060 | |
488f131b | 2061 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
04e68871 DJ |
2062 | |
2063 | /* If no catchpoint triggered for this, then keep going. */ | |
2064 | if (ecs->random_signal) | |
2065 | { | |
2066 | stop_signal = TARGET_SIGNAL_0; | |
2067 | keep_going (ecs); | |
2068 | return; | |
2069 | } | |
488f131b JB |
2070 | goto process_event_stop_test; |
2071 | ||
2072 | case TARGET_WAITKIND_EXECD: | |
527159b7 | 2073 | if (debug_infrun) |
fc5261f2 | 2074 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_EXECD\n"); |
488f131b JB |
2075 | stop_signal = TARGET_SIGNAL_TRAP; |
2076 | ||
488f131b JB |
2077 | pending_follow.execd_pathname = |
2078 | savestring (ecs->ws.value.execd_pathname, | |
2079 | strlen (ecs->ws.value.execd_pathname)); | |
2080 | ||
488f131b JB |
2081 | /* This causes the eventpoints and symbol table to be reset. Must |
2082 | do this now, before trying to determine whether to stop. */ | |
3a3e9ee3 | 2083 | follow_exec (inferior_ptid, pending_follow.execd_pathname); |
488f131b | 2084 | xfree (pending_follow.execd_pathname); |
c906108c | 2085 | |
515630c5 | 2086 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
675bf4cb | 2087 | |
0d1e5fa7 PA |
2088 | { |
2089 | /* The breakpoints module may need to touch the inferior's | |
2090 | memory. Switch to the (stopped) event ptid | |
2091 | momentarily. */ | |
2092 | ptid_t saved_inferior_ptid = inferior_ptid; | |
2093 | inferior_ptid = ecs->ptid; | |
675bf4cb | 2094 | |
0d1e5fa7 PA |
2095 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid); |
2096 | ||
2097 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); | |
2098 | inferior_ptid = saved_inferior_ptid; | |
2099 | } | |
04e68871 | 2100 | |
5a2901d9 DJ |
2101 | if (!ptid_equal (ecs->ptid, inferior_ptid)) |
2102 | { | |
0d1e5fa7 | 2103 | context_switch (ecs->ptid); |
35f196d9 | 2104 | reinit_frame_cache (); |
5a2901d9 DJ |
2105 | } |
2106 | ||
04e68871 DJ |
2107 | /* If no catchpoint triggered for this, then keep going. */ |
2108 | if (ecs->random_signal) | |
2109 | { | |
2110 | stop_signal = TARGET_SIGNAL_0; | |
2111 | keep_going (ecs); | |
2112 | return; | |
2113 | } | |
488f131b JB |
2114 | goto process_event_stop_test; |
2115 | ||
b4dc5ffa MK |
2116 | /* Be careful not to try to gather much state about a thread |
2117 | that's in a syscall. It's frequently a losing proposition. */ | |
488f131b | 2118 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
527159b7 | 2119 | if (debug_infrun) |
8a9de0e4 | 2120 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_ENTRY\n"); |
488f131b JB |
2121 | resume (0, TARGET_SIGNAL_0); |
2122 | prepare_to_wait (ecs); | |
2123 | return; | |
c906108c | 2124 | |
488f131b JB |
2125 | /* Before examining the threads further, step this thread to |
2126 | get it entirely out of the syscall. (We get notice of the | |
2127 | event when the thread is just on the verge of exiting a | |
2128 | syscall. Stepping one instruction seems to get it back | |
b4dc5ffa | 2129 | into user code.) */ |
488f131b | 2130 | case TARGET_WAITKIND_SYSCALL_RETURN: |
527159b7 | 2131 | if (debug_infrun) |
8a9de0e4 | 2132 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_SYSCALL_RETURN\n"); |
488f131b | 2133 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); |
488f131b JB |
2134 | prepare_to_wait (ecs); |
2135 | return; | |
c906108c | 2136 | |
488f131b | 2137 | case TARGET_WAITKIND_STOPPED: |
527159b7 | 2138 | if (debug_infrun) |
8a9de0e4 | 2139 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_STOPPED\n"); |
488f131b JB |
2140 | stop_signal = ecs->ws.value.sig; |
2141 | break; | |
c906108c | 2142 | |
488f131b JB |
2143 | /* We had an event in the inferior, but we are not interested |
2144 | in handling it at this level. The lower layers have already | |
8e7d2c16 | 2145 | done what needs to be done, if anything. |
8fb3e588 AC |
2146 | |
2147 | One of the possible circumstances for this is when the | |
2148 | inferior produces output for the console. The inferior has | |
2149 | not stopped, and we are ignoring the event. Another possible | |
2150 | circumstance is any event which the lower level knows will be | |
2151 | reported multiple times without an intervening resume. */ | |
488f131b | 2152 | case TARGET_WAITKIND_IGNORE: |
527159b7 | 2153 | if (debug_infrun) |
8a9de0e4 | 2154 | fprintf_unfiltered (gdb_stdlog, "infrun: TARGET_WAITKIND_IGNORE\n"); |
8e7d2c16 | 2155 | prepare_to_wait (ecs); |
488f131b JB |
2156 | return; |
2157 | } | |
c906108c | 2158 | |
488f131b JB |
2159 | if (ecs->new_thread_event) |
2160 | { | |
94cc34af PA |
2161 | if (non_stop) |
2162 | /* Non-stop assumes that the target handles adding new threads | |
2163 | to the thread list. */ | |
2164 | internal_error (__FILE__, __LINE__, "\ | |
2165 | targets should add new threads to the thread list themselves in non-stop mode."); | |
2166 | ||
2167 | /* We may want to consider not doing a resume here in order to | |
2168 | give the user a chance to play with the new thread. It might | |
2169 | be good to make that a user-settable option. */ | |
2170 | ||
2171 | /* At this point, all threads are stopped (happens automatically | |
2172 | in either the OS or the native code). Therefore we need to | |
2173 | continue all threads in order to make progress. */ | |
2174 | ||
488f131b JB |
2175 | target_resume (RESUME_ALL, 0, TARGET_SIGNAL_0); |
2176 | prepare_to_wait (ecs); | |
2177 | return; | |
2178 | } | |
c906108c | 2179 | |
237fc4c9 PA |
2180 | /* Do we need to clean up the state of a thread that has completed a |
2181 | displaced single-step? (Doing so usually affects the PC, so do | |
2182 | it here, before we set stop_pc.) */ | |
2183 | displaced_step_fixup (ecs->ptid, stop_signal); | |
2184 | ||
515630c5 | 2185 | stop_pc = regcache_read_pc (get_thread_regcache (ecs->ptid)); |
488f131b | 2186 | |
527159b7 | 2187 | if (debug_infrun) |
237fc4c9 PA |
2188 | { |
2189 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_pc = 0x%s\n", | |
2190 | paddr_nz (stop_pc)); | |
2191 | if (STOPPED_BY_WATCHPOINT (&ecs->ws)) | |
2192 | { | |
2193 | CORE_ADDR addr; | |
2194 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped by watchpoint\n"); | |
2195 | ||
2196 | if (target_stopped_data_address (¤t_target, &addr)) | |
2197 | fprintf_unfiltered (gdb_stdlog, | |
2198 | "infrun: stopped data address = 0x%s\n", | |
2199 | paddr_nz (addr)); | |
2200 | else | |
2201 | fprintf_unfiltered (gdb_stdlog, | |
2202 | "infrun: (no data address available)\n"); | |
2203 | } | |
2204 | } | |
527159b7 | 2205 | |
9f976b41 DJ |
2206 | if (stepping_past_singlestep_breakpoint) |
2207 | { | |
1c0fdd0e | 2208 | gdb_assert (singlestep_breakpoints_inserted_p); |
9f976b41 DJ |
2209 | gdb_assert (ptid_equal (singlestep_ptid, ecs->ptid)); |
2210 | gdb_assert (!ptid_equal (singlestep_ptid, saved_singlestep_ptid)); | |
2211 | ||
2212 | stepping_past_singlestep_breakpoint = 0; | |
2213 | ||
2214 | /* We've either finished single-stepping past the single-step | |
8fb3e588 AC |
2215 | breakpoint, or stopped for some other reason. It would be nice if |
2216 | we could tell, but we can't reliably. */ | |
9f976b41 | 2217 | if (stop_signal == TARGET_SIGNAL_TRAP) |
8fb3e588 | 2218 | { |
527159b7 | 2219 | if (debug_infrun) |
8a9de0e4 | 2220 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping_past_singlestep_breakpoint\n"); |
9f976b41 | 2221 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 2222 | remove_single_step_breakpoints (); |
9f976b41 DJ |
2223 | singlestep_breakpoints_inserted_p = 0; |
2224 | ||
2225 | ecs->random_signal = 0; | |
2226 | ||
0d1e5fa7 | 2227 | context_switch (saved_singlestep_ptid); |
9a4105ab AC |
2228 | if (deprecated_context_hook) |
2229 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
9f976b41 DJ |
2230 | |
2231 | resume (1, TARGET_SIGNAL_0); | |
2232 | prepare_to_wait (ecs); | |
2233 | return; | |
2234 | } | |
2235 | } | |
2236 | ||
2237 | stepping_past_singlestep_breakpoint = 0; | |
2238 | ||
ca67fcb8 | 2239 | if (!ptid_equal (deferred_step_ptid, null_ptid)) |
6a6b96b9 | 2240 | { |
94cc34af PA |
2241 | /* In non-stop mode, there's never a deferred_step_ptid set. */ |
2242 | gdb_assert (!non_stop); | |
2243 | ||
6a6b96b9 UW |
2244 | /* If we stopped for some other reason than single-stepping, ignore |
2245 | the fact that we were supposed to switch back. */ | |
2246 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
2247 | { | |
2248 | if (debug_infrun) | |
2249 | fprintf_unfiltered (gdb_stdlog, | |
ca67fcb8 | 2250 | "infrun: handling deferred step\n"); |
6a6b96b9 UW |
2251 | |
2252 | /* Pull the single step breakpoints out of the target. */ | |
2253 | if (singlestep_breakpoints_inserted_p) | |
2254 | { | |
2255 | remove_single_step_breakpoints (); | |
2256 | singlestep_breakpoints_inserted_p = 0; | |
2257 | } | |
2258 | ||
2259 | /* Note: We do not call context_switch at this point, as the | |
2260 | context is already set up for stepping the original thread. */ | |
ca67fcb8 VP |
2261 | switch_to_thread (deferred_step_ptid); |
2262 | deferred_step_ptid = null_ptid; | |
6a6b96b9 UW |
2263 | /* Suppress spurious "Switching to ..." message. */ |
2264 | previous_inferior_ptid = inferior_ptid; | |
2265 | ||
2266 | resume (1, TARGET_SIGNAL_0); | |
2267 | prepare_to_wait (ecs); | |
2268 | return; | |
2269 | } | |
ca67fcb8 VP |
2270 | |
2271 | deferred_step_ptid = null_ptid; | |
6a6b96b9 UW |
2272 | } |
2273 | ||
488f131b JB |
2274 | /* See if a thread hit a thread-specific breakpoint that was meant for |
2275 | another thread. If so, then step that thread past the breakpoint, | |
2276 | and continue it. */ | |
2277 | ||
2278 | if (stop_signal == TARGET_SIGNAL_TRAP) | |
2279 | { | |
9f976b41 DJ |
2280 | int thread_hop_needed = 0; |
2281 | ||
f8d40ec8 JB |
2282 | /* Check if a regular breakpoint has been hit before checking |
2283 | for a potential single step breakpoint. Otherwise, GDB will | |
2284 | not see this breakpoint hit when stepping onto breakpoints. */ | |
c36b740a | 2285 | if (regular_breakpoint_inserted_here_p (stop_pc)) |
488f131b | 2286 | { |
c5aa993b | 2287 | ecs->random_signal = 0; |
4fa8626c | 2288 | if (!breakpoint_thread_match (stop_pc, ecs->ptid)) |
9f976b41 DJ |
2289 | thread_hop_needed = 1; |
2290 | } | |
1c0fdd0e | 2291 | else if (singlestep_breakpoints_inserted_p) |
9f976b41 | 2292 | { |
fd48f117 DJ |
2293 | /* We have not context switched yet, so this should be true |
2294 | no matter which thread hit the singlestep breakpoint. */ | |
2295 | gdb_assert (ptid_equal (inferior_ptid, singlestep_ptid)); | |
2296 | if (debug_infrun) | |
2297 | fprintf_unfiltered (gdb_stdlog, "infrun: software single step " | |
2298 | "trap for %s\n", | |
2299 | target_pid_to_str (ecs->ptid)); | |
2300 | ||
9f976b41 DJ |
2301 | ecs->random_signal = 0; |
2302 | /* The call to in_thread_list is necessary because PTIDs sometimes | |
2303 | change when we go from single-threaded to multi-threaded. If | |
2304 | the singlestep_ptid is still in the list, assume that it is | |
2305 | really different from ecs->ptid. */ | |
2306 | if (!ptid_equal (singlestep_ptid, ecs->ptid) | |
2307 | && in_thread_list (singlestep_ptid)) | |
2308 | { | |
fd48f117 DJ |
2309 | /* If the PC of the thread we were trying to single-step |
2310 | has changed, discard this event (which we were going | |
2311 | to ignore anyway), and pretend we saw that thread | |
2312 | trap. This prevents us continuously moving the | |
2313 | single-step breakpoint forward, one instruction at a | |
2314 | time. If the PC has changed, then the thread we were | |
2315 | trying to single-step has trapped or been signalled, | |
2316 | but the event has not been reported to GDB yet. | |
2317 | ||
2318 | There might be some cases where this loses signal | |
2319 | information, if a signal has arrived at exactly the | |
2320 | same time that the PC changed, but this is the best | |
2321 | we can do with the information available. Perhaps we | |
2322 | should arrange to report all events for all threads | |
2323 | when they stop, or to re-poll the remote looking for | |
2324 | this particular thread (i.e. temporarily enable | |
2325 | schedlock). */ | |
515630c5 UW |
2326 | |
2327 | CORE_ADDR new_singlestep_pc | |
2328 | = regcache_read_pc (get_thread_regcache (singlestep_ptid)); | |
2329 | ||
2330 | if (new_singlestep_pc != singlestep_pc) | |
fd48f117 DJ |
2331 | { |
2332 | if (debug_infrun) | |
2333 | fprintf_unfiltered (gdb_stdlog, "infrun: unexpected thread," | |
2334 | " but expected thread advanced also\n"); | |
2335 | ||
2336 | /* The current context still belongs to | |
2337 | singlestep_ptid. Don't swap here, since that's | |
2338 | the context we want to use. Just fudge our | |
2339 | state and continue. */ | |
2340 | ecs->ptid = singlestep_ptid; | |
515630c5 | 2341 | stop_pc = new_singlestep_pc; |
fd48f117 DJ |
2342 | } |
2343 | else | |
2344 | { | |
2345 | if (debug_infrun) | |
2346 | fprintf_unfiltered (gdb_stdlog, | |
2347 | "infrun: unexpected thread\n"); | |
2348 | ||
2349 | thread_hop_needed = 1; | |
2350 | stepping_past_singlestep_breakpoint = 1; | |
2351 | saved_singlestep_ptid = singlestep_ptid; | |
2352 | } | |
9f976b41 DJ |
2353 | } |
2354 | } | |
2355 | ||
2356 | if (thread_hop_needed) | |
8fb3e588 | 2357 | { |
237fc4c9 | 2358 | int remove_status = 0; |
8fb3e588 | 2359 | |
527159b7 | 2360 | if (debug_infrun) |
8a9de0e4 | 2361 | fprintf_unfiltered (gdb_stdlog, "infrun: thread_hop_needed\n"); |
527159b7 | 2362 | |
8fb3e588 AC |
2363 | /* Saw a breakpoint, but it was hit by the wrong thread. |
2364 | Just continue. */ | |
2365 | ||
1c0fdd0e | 2366 | if (singlestep_breakpoints_inserted_p) |
488f131b | 2367 | { |
8fb3e588 | 2368 | /* Pull the single step breakpoints out of the target. */ |
e0cd558a | 2369 | remove_single_step_breakpoints (); |
8fb3e588 AC |
2370 | singlestep_breakpoints_inserted_p = 0; |
2371 | } | |
2372 | ||
237fc4c9 PA |
2373 | /* If the arch can displace step, don't remove the |
2374 | breakpoints. */ | |
2375 | if (!use_displaced_stepping (current_gdbarch)) | |
2376 | remove_status = remove_breakpoints (); | |
2377 | ||
8fb3e588 AC |
2378 | /* Did we fail to remove breakpoints? If so, try |
2379 | to set the PC past the bp. (There's at least | |
2380 | one situation in which we can fail to remove | |
2381 | the bp's: On HP-UX's that use ttrace, we can't | |
2382 | change the address space of a vforking child | |
2383 | process until the child exits (well, okay, not | |
2384 | then either :-) or execs. */ | |
2385 | if (remove_status != 0) | |
9d9cd7ac | 2386 | error (_("Cannot step over breakpoint hit in wrong thread")); |
8fb3e588 AC |
2387 | else |
2388 | { /* Single step */ | |
8fb3e588 | 2389 | if (!ptid_equal (inferior_ptid, ecs->ptid)) |
0d1e5fa7 PA |
2390 | context_switch (ecs->ptid); |
2391 | ||
94cc34af PA |
2392 | if (!non_stop) |
2393 | { | |
2394 | /* Only need to require the next event from this | |
2395 | thread in all-stop mode. */ | |
2396 | waiton_ptid = ecs->ptid; | |
2397 | infwait_state = infwait_thread_hop_state; | |
2398 | } | |
8fb3e588 | 2399 | |
0d1e5fa7 | 2400 | tss->stepping_over_breakpoint = 1; |
8fb3e588 AC |
2401 | keep_going (ecs); |
2402 | registers_changed (); | |
2403 | return; | |
2404 | } | |
488f131b | 2405 | } |
1c0fdd0e | 2406 | else if (singlestep_breakpoints_inserted_p) |
8fb3e588 AC |
2407 | { |
2408 | sw_single_step_trap_p = 1; | |
2409 | ecs->random_signal = 0; | |
2410 | } | |
488f131b JB |
2411 | } |
2412 | else | |
2413 | ecs->random_signal = 1; | |
c906108c | 2414 | |
488f131b | 2415 | /* See if something interesting happened to the non-current thread. If |
b40c7d58 DJ |
2416 | so, then switch to that thread. */ |
2417 | if (!ptid_equal (ecs->ptid, inferior_ptid)) | |
488f131b | 2418 | { |
527159b7 | 2419 | if (debug_infrun) |
8a9de0e4 | 2420 | fprintf_unfiltered (gdb_stdlog, "infrun: context switch\n"); |
527159b7 | 2421 | |
0d1e5fa7 | 2422 | context_switch (ecs->ptid); |
c5aa993b | 2423 | |
9a4105ab AC |
2424 | if (deprecated_context_hook) |
2425 | deprecated_context_hook (pid_to_thread_id (ecs->ptid)); | |
488f131b | 2426 | } |
c906108c | 2427 | |
1c0fdd0e | 2428 | if (singlestep_breakpoints_inserted_p) |
488f131b JB |
2429 | { |
2430 | /* Pull the single step breakpoints out of the target. */ | |
e0cd558a | 2431 | remove_single_step_breakpoints (); |
488f131b JB |
2432 | singlestep_breakpoints_inserted_p = 0; |
2433 | } | |
c906108c | 2434 | |
d983da9c DJ |
2435 | if (stepped_after_stopped_by_watchpoint) |
2436 | stopped_by_watchpoint = 0; | |
2437 | else | |
2438 | stopped_by_watchpoint = watchpoints_triggered (&ecs->ws); | |
2439 | ||
2440 | /* If necessary, step over this watchpoint. We'll be back to display | |
2441 | it in a moment. */ | |
2442 | if (stopped_by_watchpoint | |
2443 | && (HAVE_STEPPABLE_WATCHPOINT | |
2444 | || gdbarch_have_nonsteppable_watchpoint (current_gdbarch))) | |
488f131b | 2445 | { |
488f131b JB |
2446 | /* At this point, we are stopped at an instruction which has |
2447 | attempted to write to a piece of memory under control of | |
2448 | a watchpoint. The instruction hasn't actually executed | |
2449 | yet. If we were to evaluate the watchpoint expression | |
2450 | now, we would get the old value, and therefore no change | |
2451 | would seem to have occurred. | |
2452 | ||
2453 | In order to make watchpoints work `right', we really need | |
2454 | to complete the memory write, and then evaluate the | |
d983da9c DJ |
2455 | watchpoint expression. We do this by single-stepping the |
2456 | target. | |
2457 | ||
2458 | It may not be necessary to disable the watchpoint to stop over | |
2459 | it. For example, the PA can (with some kernel cooperation) | |
2460 | single step over a watchpoint without disabling the watchpoint. | |
2461 | ||
2462 | It is far more common to need to disable a watchpoint to step | |
2463 | the inferior over it. If we have non-steppable watchpoints, | |
2464 | we must disable the current watchpoint; it's simplest to | |
2465 | disable all watchpoints and breakpoints. */ | |
2466 | ||
2467 | if (!HAVE_STEPPABLE_WATCHPOINT) | |
2468 | remove_breakpoints (); | |
488f131b JB |
2469 | registers_changed (); |
2470 | target_resume (ecs->ptid, 1, TARGET_SIGNAL_0); /* Single step */ | |
0d1e5fa7 | 2471 | waiton_ptid = ecs->ptid; |
d983da9c | 2472 | if (HAVE_STEPPABLE_WATCHPOINT) |
0d1e5fa7 | 2473 | infwait_state = infwait_step_watch_state; |
d983da9c | 2474 | else |
0d1e5fa7 | 2475 | infwait_state = infwait_nonstep_watch_state; |
488f131b JB |
2476 | prepare_to_wait (ecs); |
2477 | return; | |
2478 | } | |
2479 | ||
488f131b JB |
2480 | ecs->stop_func_start = 0; |
2481 | ecs->stop_func_end = 0; | |
2482 | ecs->stop_func_name = 0; | |
2483 | /* Don't care about return value; stop_func_start and stop_func_name | |
2484 | will both be 0 if it doesn't work. */ | |
2485 | find_pc_partial_function (stop_pc, &ecs->stop_func_name, | |
2486 | &ecs->stop_func_start, &ecs->stop_func_end); | |
cbf3b44a UW |
2487 | ecs->stop_func_start |
2488 | += gdbarch_deprecated_function_start_offset (current_gdbarch); | |
0d1e5fa7 | 2489 | tss->stepping_over_breakpoint = 0; |
488f131b JB |
2490 | bpstat_clear (&stop_bpstat); |
2491 | stop_step = 0; | |
488f131b JB |
2492 | stop_print_frame = 1; |
2493 | ecs->random_signal = 0; | |
2494 | stopped_by_random_signal = 0; | |
488f131b | 2495 | |
3352ef37 | 2496 | if (stop_signal == TARGET_SIGNAL_TRAP |
ca67fcb8 | 2497 | && stepping_over_breakpoint |
3352ef37 | 2498 | && gdbarch_single_step_through_delay_p (current_gdbarch) |
0d1e5fa7 | 2499 | && currently_stepping (tss)) |
3352ef37 | 2500 | { |
b50d7442 | 2501 | /* We're trying to step off a breakpoint. Turns out that we're |
3352ef37 AC |
2502 | also on an instruction that needs to be stepped multiple |
2503 | times before it's been fully executing. E.g., architectures | |
2504 | with a delay slot. It needs to be stepped twice, once for | |
2505 | the instruction and once for the delay slot. */ | |
2506 | int step_through_delay | |
2507 | = gdbarch_single_step_through_delay (current_gdbarch, | |
2508 | get_current_frame ()); | |
527159b7 | 2509 | if (debug_infrun && step_through_delay) |
8a9de0e4 | 2510 | fprintf_unfiltered (gdb_stdlog, "infrun: step through delay\n"); |
3352ef37 AC |
2511 | if (step_range_end == 0 && step_through_delay) |
2512 | { | |
2513 | /* The user issued a continue when stopped at a breakpoint. | |
2514 | Set up for another trap and get out of here. */ | |
0d1e5fa7 | 2515 | tss->stepping_over_breakpoint = 1; |
3352ef37 AC |
2516 | keep_going (ecs); |
2517 | return; | |
2518 | } | |
2519 | else if (step_through_delay) | |
2520 | { | |
2521 | /* The user issued a step when stopped at a breakpoint. | |
2522 | Maybe we should stop, maybe we should not - the delay | |
2523 | slot *might* correspond to a line of source. In any | |
ca67fcb8 VP |
2524 | case, don't decide that here, just set |
2525 | ecs->stepping_over_breakpoint, making sure we | |
2526 | single-step again before breakpoints are re-inserted. */ | |
0d1e5fa7 | 2527 | tss->stepping_over_breakpoint = 1; |
3352ef37 AC |
2528 | } |
2529 | } | |
2530 | ||
488f131b JB |
2531 | /* Look at the cause of the stop, and decide what to do. |
2532 | The alternatives are: | |
0d1e5fa7 PA |
2533 | 1) stop_stepping and return; to really stop and return to the debugger, |
2534 | 2) keep_going and return to start up again | |
2535 | (set tss->stepping_over_breakpoint to 1 to single step once) | |
488f131b JB |
2536 | 3) set ecs->random_signal to 1, and the decision between 1 and 2 |
2537 | will be made according to the signal handling tables. */ | |
2538 | ||
2539 | /* First, distinguish signals caused by the debugger from signals | |
03cebad2 MK |
2540 | that have to do with the program's own actions. Note that |
2541 | breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending | |
2542 | on the operating system version. Here we detect when a SIGILL or | |
2543 | SIGEMT is really a breakpoint and change it to SIGTRAP. We do | |
2544 | something similar for SIGSEGV, since a SIGSEGV will be generated | |
2545 | when we're trying to execute a breakpoint instruction on a | |
2546 | non-executable stack. This happens for call dummy breakpoints | |
2547 | for architectures like SPARC that place call dummies on the | |
237fc4c9 | 2548 | stack. |
488f131b | 2549 | |
237fc4c9 PA |
2550 | If we're doing a displaced step past a breakpoint, then the |
2551 | breakpoint is always inserted at the original instruction; | |
2552 | non-standard signals can't be explained by the breakpoint. */ | |
488f131b | 2553 | if (stop_signal == TARGET_SIGNAL_TRAP |
237fc4c9 PA |
2554 | || (! stepping_over_breakpoint |
2555 | && breakpoint_inserted_here_p (stop_pc) | |
8fb3e588 AC |
2556 | && (stop_signal == TARGET_SIGNAL_ILL |
2557 | || stop_signal == TARGET_SIGNAL_SEGV | |
2558 | || stop_signal == TARGET_SIGNAL_EMT)) | |
b0f4b84b DJ |
2559 | || stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_NO_SIGSTOP |
2560 | || stop_soon == STOP_QUIETLY_REMOTE) | |
488f131b JB |
2561 | { |
2562 | if (stop_signal == TARGET_SIGNAL_TRAP && stop_after_trap) | |
2563 | { | |
527159b7 | 2564 | if (debug_infrun) |
8a9de0e4 | 2565 | fprintf_unfiltered (gdb_stdlog, "infrun: stopped\n"); |
488f131b JB |
2566 | stop_print_frame = 0; |
2567 | stop_stepping (ecs); | |
2568 | return; | |
2569 | } | |
c54cfec8 EZ |
2570 | |
2571 | /* This is originated from start_remote(), start_inferior() and | |
2572 | shared libraries hook functions. */ | |
b0f4b84b | 2573 | if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE) |
488f131b | 2574 | { |
527159b7 | 2575 | if (debug_infrun) |
8a9de0e4 | 2576 | fprintf_unfiltered (gdb_stdlog, "infrun: quietly stopped\n"); |
488f131b JB |
2577 | stop_stepping (ecs); |
2578 | return; | |
2579 | } | |
2580 | ||
c54cfec8 | 2581 | /* This originates from attach_command(). We need to overwrite |
a0d21d28 PA |
2582 | the stop_signal here, because some kernels don't ignore a |
2583 | SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call. | |
2584 | See more comments in inferior.h. On the other hand, if we | |
a0ef4274 | 2585 | get a non-SIGSTOP, report it to the user - assume the backend |
a0d21d28 PA |
2586 | will handle the SIGSTOP if it should show up later. |
2587 | ||
2588 | Also consider that the attach is complete when we see a | |
2589 | SIGTRAP. Some systems (e.g. Windows), and stubs supporting | |
2590 | target extended-remote report it instead of a SIGSTOP | |
2591 | (e.g. gdbserver). We already rely on SIGTRAP being our | |
2592 | signal, so this is no exception. */ | |
a0ef4274 | 2593 | if (stop_soon == STOP_QUIETLY_NO_SIGSTOP |
a0d21d28 PA |
2594 | && (stop_signal == TARGET_SIGNAL_STOP |
2595 | || stop_signal == TARGET_SIGNAL_TRAP)) | |
c54cfec8 EZ |
2596 | { |
2597 | stop_stepping (ecs); | |
a0ef4274 | 2598 | stop_signal = TARGET_SIGNAL_0; |
c54cfec8 EZ |
2599 | return; |
2600 | } | |
2601 | ||
fba57f8f VP |
2602 | /* See if there is a breakpoint at the current PC. */ |
2603 | stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid); | |
2604 | ||
2605 | /* Following in case break condition called a | |
2606 | function. */ | |
2607 | stop_print_frame = 1; | |
488f131b | 2608 | |
73dd234f | 2609 | /* NOTE: cagney/2003-03-29: These two checks for a random signal |
8fb3e588 AC |
2610 | at one stage in the past included checks for an inferior |
2611 | function call's call dummy's return breakpoint. The original | |
2612 | comment, that went with the test, read: | |
73dd234f | 2613 | |
8fb3e588 AC |
2614 | ``End of a stack dummy. Some systems (e.g. Sony news) give |
2615 | another signal besides SIGTRAP, so check here as well as | |
2616 | above.'' | |
73dd234f AC |
2617 | |
2618 | If someone ever tries to get get call dummys on a | |
2619 | non-executable stack to work (where the target would stop | |
03cebad2 MK |
2620 | with something like a SIGSEGV), then those tests might need |
2621 | to be re-instated. Given, however, that the tests were only | |
73dd234f | 2622 | enabled when momentary breakpoints were not being used, I |
03cebad2 MK |
2623 | suspect that it won't be the case. |
2624 | ||
8fb3e588 AC |
2625 | NOTE: kettenis/2004-02-05: Indeed such checks don't seem to |
2626 | be necessary for call dummies on a non-executable stack on | |
2627 | SPARC. */ | |
73dd234f | 2628 | |
488f131b JB |
2629 | if (stop_signal == TARGET_SIGNAL_TRAP) |
2630 | ecs->random_signal | |
2631 | = !(bpstat_explains_signal (stop_bpstat) | |
ca67fcb8 | 2632 | || stepping_over_breakpoint |
488f131b | 2633 | || (step_range_end && step_resume_breakpoint == NULL)); |
488f131b JB |
2634 | else |
2635 | { | |
73dd234f | 2636 | ecs->random_signal = !bpstat_explains_signal (stop_bpstat); |
488f131b JB |
2637 | if (!ecs->random_signal) |
2638 | stop_signal = TARGET_SIGNAL_TRAP; | |
2639 | } | |
2640 | } | |
2641 | ||
2642 | /* When we reach this point, we've pretty much decided | |
2643 | that the reason for stopping must've been a random | |
2644 | (unexpected) signal. */ | |
2645 | ||
2646 | else | |
2647 | ecs->random_signal = 1; | |
488f131b | 2648 | |
04e68871 | 2649 | process_event_stop_test: |
488f131b JB |
2650 | /* For the program's own signals, act according to |
2651 | the signal handling tables. */ | |
2652 | ||
2653 | if (ecs->random_signal) | |
2654 | { | |
2655 | /* Signal not for debugging purposes. */ | |
2656 | int printed = 0; | |
2657 | ||
527159b7 | 2658 | if (debug_infrun) |
8a9de0e4 | 2659 | fprintf_unfiltered (gdb_stdlog, "infrun: random signal %d\n", stop_signal); |
527159b7 | 2660 | |
488f131b JB |
2661 | stopped_by_random_signal = 1; |
2662 | ||
2663 | if (signal_print[stop_signal]) | |
2664 | { | |
2665 | printed = 1; | |
2666 | target_terminal_ours_for_output (); | |
2667 | print_stop_reason (SIGNAL_RECEIVED, stop_signal); | |
2668 | } | |
a0ef4274 | 2669 | if (signal_stop_state (stop_signal)) |
488f131b JB |
2670 | { |
2671 | stop_stepping (ecs); | |
2672 | return; | |
2673 | } | |
2674 | /* If not going to stop, give terminal back | |
2675 | if we took it away. */ | |
2676 | else if (printed) | |
2677 | target_terminal_inferior (); | |
2678 | ||
2679 | /* Clear the signal if it should not be passed. */ | |
2680 | if (signal_program[stop_signal] == 0) | |
2681 | stop_signal = TARGET_SIGNAL_0; | |
2682 | ||
68f53502 | 2683 | if (prev_pc == read_pc () |
74960c60 | 2684 | && stepping_over_breakpoint |
68f53502 AC |
2685 | && step_resume_breakpoint == NULL) |
2686 | { | |
2687 | /* We were just starting a new sequence, attempting to | |
2688 | single-step off of a breakpoint and expecting a SIGTRAP. | |
237fc4c9 | 2689 | Instead this signal arrives. This signal will take us out |
68f53502 AC |
2690 | of the stepping range so GDB needs to remember to, when |
2691 | the signal handler returns, resume stepping off that | |
2692 | breakpoint. */ | |
2693 | /* To simplify things, "continue" is forced to use the same | |
2694 | code paths as single-step - set a breakpoint at the | |
2695 | signal return address and then, once hit, step off that | |
2696 | breakpoint. */ | |
237fc4c9 PA |
2697 | if (debug_infrun) |
2698 | fprintf_unfiltered (gdb_stdlog, | |
2699 | "infrun: signal arrived while stepping over " | |
2700 | "breakpoint\n"); | |
d3169d93 | 2701 | |
44cbf7b5 | 2702 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
0d1e5fa7 | 2703 | tss->step_after_step_resume_breakpoint = 1; |
9d799f85 AC |
2704 | keep_going (ecs); |
2705 | return; | |
68f53502 | 2706 | } |
9d799f85 AC |
2707 | |
2708 | if (step_range_end != 0 | |
2709 | && stop_signal != TARGET_SIGNAL_0 | |
2710 | && stop_pc >= step_range_start && stop_pc < step_range_end | |
2711 | && frame_id_eq (get_frame_id (get_current_frame ()), | |
2712 | step_frame_id) | |
2713 | && step_resume_breakpoint == NULL) | |
d303a6c7 AC |
2714 | { |
2715 | /* The inferior is about to take a signal that will take it | |
2716 | out of the single step range. Set a breakpoint at the | |
2717 | current PC (which is presumably where the signal handler | |
2718 | will eventually return) and then allow the inferior to | |
2719 | run free. | |
2720 | ||
2721 | Note that this is only needed for a signal delivered | |
2722 | while in the single-step range. Nested signals aren't a | |
2723 | problem as they eventually all return. */ | |
237fc4c9 PA |
2724 | if (debug_infrun) |
2725 | fprintf_unfiltered (gdb_stdlog, | |
2726 | "infrun: signal may take us out of " | |
2727 | "single-step range\n"); | |
2728 | ||
44cbf7b5 | 2729 | insert_step_resume_breakpoint_at_frame (get_current_frame ()); |
9d799f85 AC |
2730 | keep_going (ecs); |
2731 | return; | |
d303a6c7 | 2732 | } |
9d799f85 AC |
2733 | |
2734 | /* Note: step_resume_breakpoint may be non-NULL. This occures | |
2735 | when either there's a nested signal, or when there's a | |
2736 | pending signal enabled just as the signal handler returns | |
2737 | (leaving the inferior at the step-resume-breakpoint without | |
2738 | actually executing it). Either way continue until the | |
2739 | breakpoint is really hit. */ | |
488f131b JB |
2740 | keep_going (ecs); |
2741 | return; | |
2742 | } | |
2743 | ||
2744 | /* Handle cases caused by hitting a breakpoint. */ | |
2745 | { | |
2746 | CORE_ADDR jmp_buf_pc; | |
2747 | struct bpstat_what what; | |
2748 | ||
2749 | what = bpstat_what (stop_bpstat); | |
2750 | ||
2751 | if (what.call_dummy) | |
2752 | { | |
2753 | stop_stack_dummy = 1; | |
c5aa993b | 2754 | } |
c906108c | 2755 | |
488f131b | 2756 | switch (what.main_action) |
c5aa993b | 2757 | { |
488f131b | 2758 | case BPSTAT_WHAT_SET_LONGJMP_RESUME: |
611c83ae PA |
2759 | /* If we hit the breakpoint at longjmp while stepping, we |
2760 | install a momentary breakpoint at the target of the | |
2761 | jmp_buf. */ | |
2762 | ||
2763 | if (debug_infrun) | |
2764 | fprintf_unfiltered (gdb_stdlog, | |
2765 | "infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME\n"); | |
2766 | ||
0d1e5fa7 | 2767 | tss->stepping_over_breakpoint = 1; |
611c83ae | 2768 | |
91104499 | 2769 | if (!gdbarch_get_longjmp_target_p (current_gdbarch) |
60ade65d UW |
2770 | || !gdbarch_get_longjmp_target (current_gdbarch, |
2771 | get_current_frame (), &jmp_buf_pc)) | |
c5aa993b | 2772 | { |
611c83ae PA |
2773 | if (debug_infrun) |
2774 | fprintf_unfiltered (gdb_stdlog, "\ | |
2775 | infrun: BPSTAT_WHAT_SET_LONGJMP_RESUME (!gdbarch_get_longjmp_target)\n"); | |
488f131b | 2776 | keep_going (ecs); |
104c1213 | 2777 | return; |
c5aa993b | 2778 | } |
488f131b | 2779 | |
611c83ae PA |
2780 | /* We're going to replace the current step-resume breakpoint |
2781 | with a longjmp-resume breakpoint. */ | |
488f131b | 2782 | if (step_resume_breakpoint != NULL) |
611c83ae PA |
2783 | delete_step_resume_breakpoint (&step_resume_breakpoint); |
2784 | ||
2785 | /* Insert a breakpoint at resume address. */ | |
2786 | insert_longjmp_resume_breakpoint (jmp_buf_pc); | |
c906108c | 2787 | |
488f131b JB |
2788 | keep_going (ecs); |
2789 | return; | |
c906108c | 2790 | |
488f131b | 2791 | case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME: |
527159b7 | 2792 | if (debug_infrun) |
611c83ae PA |
2793 | fprintf_unfiltered (gdb_stdlog, |
2794 | "infrun: BPSTAT_WHAT_CLEAR_LONGJMP_RESUME\n"); | |
2795 | ||
2796 | gdb_assert (step_resume_breakpoint != NULL); | |
2797 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
2798 | ||
2799 | stop_step = 1; | |
2800 | print_stop_reason (END_STEPPING_RANGE, 0); | |
2801 | stop_stepping (ecs); | |
2802 | return; | |
488f131b JB |
2803 | |
2804 | case BPSTAT_WHAT_SINGLE: | |
527159b7 | 2805 | if (debug_infrun) |
8802d8ed | 2806 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_SINGLE\n"); |
0d1e5fa7 | 2807 | tss->stepping_over_breakpoint = 1; |
488f131b JB |
2808 | /* Still need to check other stuff, at least the case |
2809 | where we are stepping and step out of the right range. */ | |
2810 | break; | |
c906108c | 2811 | |
488f131b | 2812 | case BPSTAT_WHAT_STOP_NOISY: |
527159b7 | 2813 | if (debug_infrun) |
8802d8ed | 2814 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_NOISY\n"); |
488f131b | 2815 | stop_print_frame = 1; |
c906108c | 2816 | |
d303a6c7 AC |
2817 | /* We are about to nuke the step_resume_breakpointt via the |
2818 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2819 | |
488f131b JB |
2820 | stop_stepping (ecs); |
2821 | return; | |
c5aa993b | 2822 | |
488f131b | 2823 | case BPSTAT_WHAT_STOP_SILENT: |
527159b7 | 2824 | if (debug_infrun) |
8802d8ed | 2825 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STOP_SILENT\n"); |
488f131b | 2826 | stop_print_frame = 0; |
c5aa993b | 2827 | |
d303a6c7 AC |
2828 | /* We are about to nuke the step_resume_breakpoin via the |
2829 | cleanup chain, so no need to worry about it here. */ | |
c5aa993b | 2830 | |
488f131b | 2831 | stop_stepping (ecs); |
e441088d | 2832 | return; |
c5aa993b | 2833 | |
488f131b JB |
2834 | case BPSTAT_WHAT_STEP_RESUME: |
2835 | /* This proably demands a more elegant solution, but, yeah | |
2836 | right... | |
c5aa993b | 2837 | |
488f131b JB |
2838 | This function's use of the simple variable |
2839 | step_resume_breakpoint doesn't seem to accomodate | |
2840 | simultaneously active step-resume bp's, although the | |
2841 | breakpoint list certainly can. | |
c5aa993b | 2842 | |
488f131b JB |
2843 | If we reach here and step_resume_breakpoint is already |
2844 | NULL, then apparently we have multiple active | |
2845 | step-resume bp's. We'll just delete the breakpoint we | |
2846 | stopped at, and carry on. | |
2847 | ||
2848 | Correction: what the code currently does is delete a | |
2849 | step-resume bp, but it makes no effort to ensure that | |
2850 | the one deleted is the one currently stopped at. MVS */ | |
c5aa993b | 2851 | |
527159b7 | 2852 | if (debug_infrun) |
8802d8ed | 2853 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_STEP_RESUME\n"); |
527159b7 | 2854 | |
488f131b JB |
2855 | if (step_resume_breakpoint == NULL) |
2856 | { | |
2857 | step_resume_breakpoint = | |
2858 | bpstat_find_step_resume_breakpoint (stop_bpstat); | |
2859 | } | |
2860 | delete_step_resume_breakpoint (&step_resume_breakpoint); | |
0d1e5fa7 | 2861 | if (tss->step_after_step_resume_breakpoint) |
68f53502 AC |
2862 | { |
2863 | /* Back when the step-resume breakpoint was inserted, we | |
2864 | were trying to single-step off a breakpoint. Go back | |
2865 | to doing that. */ | |
0d1e5fa7 PA |
2866 | tss->step_after_step_resume_breakpoint = 0; |
2867 | tss->stepping_over_breakpoint = 1; | |
68f53502 AC |
2868 | keep_going (ecs); |
2869 | return; | |
2870 | } | |
488f131b JB |
2871 | break; |
2872 | ||
488f131b JB |
2873 | case BPSTAT_WHAT_CHECK_SHLIBS: |
2874 | case BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK: | |
c906108c | 2875 | { |
527159b7 | 2876 | if (debug_infrun) |
8802d8ed | 2877 | fprintf_unfiltered (gdb_stdlog, "infrun: BPSTAT_WHAT_CHECK_SHLIBS\n"); |
488f131b JB |
2878 | |
2879 | /* Check for any newly added shared libraries if we're | |
2880 | supposed to be adding them automatically. Switch | |
2881 | terminal for any messages produced by | |
2882 | breakpoint_re_set. */ | |
2883 | target_terminal_ours_for_output (); | |
aff6338a | 2884 | /* NOTE: cagney/2003-11-25: Make certain that the target |
8fb3e588 AC |
2885 | stack's section table is kept up-to-date. Architectures, |
2886 | (e.g., PPC64), use the section table to perform | |
2887 | operations such as address => section name and hence | |
2888 | require the table to contain all sections (including | |
2889 | those found in shared libraries). */ | |
aff6338a | 2890 | /* NOTE: cagney/2003-11-25: Pass current_target and not |
8fb3e588 AC |
2891 | exec_ops to SOLIB_ADD. This is because current GDB is |
2892 | only tooled to propagate section_table changes out from | |
2893 | the "current_target" (see target_resize_to_sections), and | |
2894 | not up from the exec stratum. This, of course, isn't | |
2895 | right. "infrun.c" should only interact with the | |
2896 | exec/process stratum, instead relying on the target stack | |
2897 | to propagate relevant changes (stop, section table | |
2898 | changed, ...) up to other layers. */ | |
a77053c2 | 2899 | #ifdef SOLIB_ADD |
aff6338a | 2900 | SOLIB_ADD (NULL, 0, ¤t_target, auto_solib_add); |
a77053c2 MK |
2901 | #else |
2902 | solib_add (NULL, 0, ¤t_target, auto_solib_add); | |
2903 | #endif | |
488f131b JB |
2904 | target_terminal_inferior (); |
2905 | ||
488f131b JB |
2906 | /* If requested, stop when the dynamic linker notifies |
2907 | gdb of events. This allows the user to get control | |
2908 | and place breakpoints in initializer routines for | |
2909 | dynamically loaded objects (among other things). */ | |
877522db | 2910 | if (stop_on_solib_events || stop_stack_dummy) |
d4f3574e | 2911 | { |
488f131b | 2912 | stop_stepping (ecs); |
d4f3574e SS |
2913 | return; |
2914 | } | |
c5aa993b | 2915 | |
488f131b JB |
2916 | /* If we stopped due to an explicit catchpoint, then the |
2917 | (see above) call to SOLIB_ADD pulled in any symbols | |
2918 | from a newly-loaded library, if appropriate. | |
2919 | ||
2920 | We do want the inferior to stop, but not where it is | |
2921 | now, which is in the dynamic linker callback. Rather, | |
2922 | we would like it stop in the user's program, just after | |
2923 | the call that caused this catchpoint to trigger. That | |
2924 | gives the user a more useful vantage from which to | |
2925 | examine their program's state. */ | |
8fb3e588 AC |
2926 | else if (what.main_action |
2927 | == BPSTAT_WHAT_CHECK_SHLIBS_RESUME_FROM_HOOK) | |
c906108c | 2928 | { |
488f131b JB |
2929 | /* ??rehrauer: If I could figure out how to get the |
2930 | right return PC from here, we could just set a temp | |
2931 | breakpoint and resume. I'm not sure we can without | |
2932 | cracking open the dld's shared libraries and sniffing | |
2933 | their unwind tables and text/data ranges, and that's | |
2934 | not a terribly portable notion. | |
2935 | ||
2936 | Until that time, we must step the inferior out of the | |
2937 | dld callback, and also out of the dld itself (and any | |
2938 | code or stubs in libdld.sl, such as "shl_load" and | |
2939 | friends) until we reach non-dld code. At that point, | |
2940 | we can stop stepping. */ | |
2941 | bpstat_get_triggered_catchpoints (stop_bpstat, | |
0d1e5fa7 | 2942 | &tss-> |
488f131b | 2943 | stepping_through_solib_catchpoints); |
0d1e5fa7 | 2944 | tss->stepping_through_solib_after_catch = 1; |
488f131b JB |
2945 | |
2946 | /* Be sure to lift all breakpoints, so the inferior does | |
2947 | actually step past this point... */ | |
0d1e5fa7 | 2948 | tss->stepping_over_breakpoint = 1; |
488f131b | 2949 | break; |
c906108c | 2950 | } |
c5aa993b | 2951 | else |
c5aa993b | 2952 | { |
488f131b | 2953 | /* We want to step over this breakpoint, then keep going. */ |
0d1e5fa7 | 2954 | tss->stepping_over_breakpoint = 1; |
488f131b | 2955 | break; |
c5aa993b | 2956 | } |
488f131b | 2957 | } |
488f131b | 2958 | break; |
c906108c | 2959 | |
488f131b JB |
2960 | case BPSTAT_WHAT_LAST: |
2961 | /* Not a real code, but listed here to shut up gcc -Wall. */ | |
c906108c | 2962 | |
488f131b JB |
2963 | case BPSTAT_WHAT_KEEP_CHECKING: |
2964 | break; | |
2965 | } | |
2966 | } | |
c906108c | 2967 | |
488f131b JB |
2968 | /* We come here if we hit a breakpoint but should not |
2969 | stop for it. Possibly we also were stepping | |
2970 | and should stop for that. So fall through and | |
2971 | test for stepping. But, if not stepping, | |
2972 | do not stop. */ | |
c906108c | 2973 | |
9d1ff73f MS |
2974 | /* Are we stepping to get the inferior out of the dynamic linker's |
2975 | hook (and possibly the dld itself) after catching a shlib | |
2976 | event? */ | |
0d1e5fa7 | 2977 | if (tss->stepping_through_solib_after_catch) |
488f131b JB |
2978 | { |
2979 | #if defined(SOLIB_ADD) | |
2980 | /* Have we reached our destination? If not, keep going. */ | |
2981 | if (SOLIB_IN_DYNAMIC_LINKER (PIDGET (ecs->ptid), stop_pc)) | |
2982 | { | |
527159b7 | 2983 | if (debug_infrun) |
8a9de0e4 | 2984 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping in dynamic linker\n"); |
0d1e5fa7 | 2985 | tss->stepping_over_breakpoint = 1; |
488f131b | 2986 | keep_going (ecs); |
104c1213 | 2987 | return; |
488f131b JB |
2988 | } |
2989 | #endif | |
527159b7 | 2990 | if (debug_infrun) |
8a9de0e4 | 2991 | fprintf_unfiltered (gdb_stdlog, "infrun: step past dynamic linker\n"); |
488f131b JB |
2992 | /* Else, stop and report the catchpoint(s) whose triggering |
2993 | caused us to begin stepping. */ | |
0d1e5fa7 | 2994 | tss->stepping_through_solib_after_catch = 0; |
488f131b | 2995 | bpstat_clear (&stop_bpstat); |
0d1e5fa7 PA |
2996 | stop_bpstat = bpstat_copy (tss->stepping_through_solib_catchpoints); |
2997 | bpstat_clear (&tss->stepping_through_solib_catchpoints); | |
488f131b JB |
2998 | stop_print_frame = 1; |
2999 | stop_stepping (ecs); | |
3000 | return; | |
3001 | } | |
c906108c | 3002 | |
488f131b JB |
3003 | if (step_resume_breakpoint) |
3004 | { | |
527159b7 | 3005 | if (debug_infrun) |
d3169d93 DJ |
3006 | fprintf_unfiltered (gdb_stdlog, |
3007 | "infrun: step-resume breakpoint is inserted\n"); | |
527159b7 | 3008 | |
488f131b JB |
3009 | /* Having a step-resume breakpoint overrides anything |
3010 | else having to do with stepping commands until | |
3011 | that breakpoint is reached. */ | |
488f131b JB |
3012 | keep_going (ecs); |
3013 | return; | |
3014 | } | |
c5aa993b | 3015 | |
488f131b JB |
3016 | if (step_range_end == 0) |
3017 | { | |
527159b7 | 3018 | if (debug_infrun) |
8a9de0e4 | 3019 | fprintf_unfiltered (gdb_stdlog, "infrun: no stepping, continue\n"); |
488f131b | 3020 | /* Likewise if we aren't even stepping. */ |
488f131b JB |
3021 | keep_going (ecs); |
3022 | return; | |
3023 | } | |
c5aa993b | 3024 | |
488f131b | 3025 | /* If stepping through a line, keep going if still within it. |
c906108c | 3026 | |
488f131b JB |
3027 | Note that step_range_end is the address of the first instruction |
3028 | beyond the step range, and NOT the address of the last instruction | |
3029 | within it! */ | |
3030 | if (stop_pc >= step_range_start && stop_pc < step_range_end) | |
3031 | { | |
527159b7 | 3032 | if (debug_infrun) |
8a9de0e4 | 3033 | fprintf_unfiltered (gdb_stdlog, "infrun: stepping inside range [0x%s-0x%s]\n", |
527159b7 RC |
3034 | paddr_nz (step_range_start), |
3035 | paddr_nz (step_range_end)); | |
488f131b JB |
3036 | keep_going (ecs); |
3037 | return; | |
3038 | } | |
c5aa993b | 3039 | |
488f131b | 3040 | /* We stepped out of the stepping range. */ |
c906108c | 3041 | |
488f131b JB |
3042 | /* If we are stepping at the source level and entered the runtime |
3043 | loader dynamic symbol resolution code, we keep on single stepping | |
3044 | until we exit the run time loader code and reach the callee's | |
3045 | address. */ | |
3046 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
cfd8ab24 | 3047 | && in_solib_dynsym_resolve_code (stop_pc)) |
488f131b | 3048 | { |
4c8c40e6 MK |
3049 | CORE_ADDR pc_after_resolver = |
3050 | gdbarch_skip_solib_resolver (current_gdbarch, stop_pc); | |
c906108c | 3051 | |
527159b7 | 3052 | if (debug_infrun) |
8a9de0e4 | 3053 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into dynsym resolve code\n"); |
527159b7 | 3054 | |
488f131b JB |
3055 | if (pc_after_resolver) |
3056 | { | |
3057 | /* Set up a step-resume breakpoint at the address | |
3058 | indicated by SKIP_SOLIB_RESOLVER. */ | |
3059 | struct symtab_and_line sr_sal; | |
fe39c653 | 3060 | init_sal (&sr_sal); |
488f131b JB |
3061 | sr_sal.pc = pc_after_resolver; |
3062 | ||
44cbf7b5 | 3063 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c5aa993b | 3064 | } |
c906108c | 3065 | |
488f131b JB |
3066 | keep_going (ecs); |
3067 | return; | |
3068 | } | |
c906108c | 3069 | |
42edda50 AC |
3070 | if (step_range_end != 1 |
3071 | && (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
3072 | || step_over_calls == STEP_OVER_ALL) | |
3073 | && get_frame_type (get_current_frame ()) == SIGTRAMP_FRAME) | |
488f131b | 3074 | { |
527159b7 | 3075 | if (debug_infrun) |
8a9de0e4 | 3076 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into signal trampoline\n"); |
42edda50 | 3077 | /* The inferior, while doing a "step" or "next", has ended up in |
8fb3e588 AC |
3078 | a signal trampoline (either by a signal being delivered or by |
3079 | the signal handler returning). Just single-step until the | |
3080 | inferior leaves the trampoline (either by calling the handler | |
3081 | or returning). */ | |
488f131b JB |
3082 | keep_going (ecs); |
3083 | return; | |
3084 | } | |
c906108c | 3085 | |
c17eaafe DJ |
3086 | /* Check for subroutine calls. The check for the current frame |
3087 | equalling the step ID is not necessary - the check of the | |
3088 | previous frame's ID is sufficient - but it is a common case and | |
3089 | cheaper than checking the previous frame's ID. | |
14e60db5 DJ |
3090 | |
3091 | NOTE: frame_id_eq will never report two invalid frame IDs as | |
3092 | being equal, so to get into this block, both the current and | |
3093 | previous frame must have valid frame IDs. */ | |
c17eaafe | 3094 | if (!frame_id_eq (get_frame_id (get_current_frame ()), step_frame_id) |
eb2f4a08 | 3095 | && frame_id_eq (frame_unwind_id (get_current_frame ()), step_frame_id)) |
488f131b | 3096 | { |
95918acb | 3097 | CORE_ADDR real_stop_pc; |
8fb3e588 | 3098 | |
527159b7 | 3099 | if (debug_infrun) |
8a9de0e4 | 3100 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into subroutine\n"); |
527159b7 | 3101 | |
95918acb AC |
3102 | if ((step_over_calls == STEP_OVER_NONE) |
3103 | || ((step_range_end == 1) | |
3104 | && in_prologue (prev_pc, ecs->stop_func_start))) | |
3105 | { | |
3106 | /* I presume that step_over_calls is only 0 when we're | |
3107 | supposed to be stepping at the assembly language level | |
3108 | ("stepi"). Just stop. */ | |
3109 | /* Also, maybe we just did a "nexti" inside a prolog, so we | |
3110 | thought it was a subroutine call but it was not. Stop as | |
3111 | well. FENN */ | |
3112 | stop_step = 1; | |
3113 | print_stop_reason (END_STEPPING_RANGE, 0); | |
3114 | stop_stepping (ecs); | |
3115 | return; | |
3116 | } | |
8fb3e588 | 3117 | |
8567c30f AC |
3118 | if (step_over_calls == STEP_OVER_ALL) |
3119 | { | |
3120 | /* We're doing a "next", set a breakpoint at callee's return | |
3121 | address (the address at which the caller will | |
3122 | resume). */ | |
14e60db5 | 3123 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
8567c30f AC |
3124 | keep_going (ecs); |
3125 | return; | |
3126 | } | |
a53c66de | 3127 | |
95918acb | 3128 | /* If we are in a function call trampoline (a stub between the |
8fb3e588 AC |
3129 | calling routine and the real function), locate the real |
3130 | function. That's what tells us (a) whether we want to step | |
3131 | into it at all, and (b) what prologue we want to run to the | |
3132 | end of, if we do step into it. */ | |
52f729a7 | 3133 | real_stop_pc = skip_language_trampoline (get_current_frame (), stop_pc); |
95918acb | 3134 | if (real_stop_pc == 0) |
52f729a7 UW |
3135 | real_stop_pc = gdbarch_skip_trampoline_code |
3136 | (current_gdbarch, get_current_frame (), stop_pc); | |
95918acb AC |
3137 | if (real_stop_pc != 0) |
3138 | ecs->stop_func_start = real_stop_pc; | |
8fb3e588 | 3139 | |
cfd8ab24 | 3140 | if (in_solib_dynsym_resolve_code (ecs->stop_func_start)) |
1b2bfbb9 RC |
3141 | { |
3142 | struct symtab_and_line sr_sal; | |
3143 | init_sal (&sr_sal); | |
3144 | sr_sal.pc = ecs->stop_func_start; | |
3145 | ||
44cbf7b5 | 3146 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
8fb3e588 AC |
3147 | keep_going (ecs); |
3148 | return; | |
1b2bfbb9 RC |
3149 | } |
3150 | ||
95918acb | 3151 | /* If we have line number information for the function we are |
8fb3e588 | 3152 | thinking of stepping into, step into it. |
95918acb | 3153 | |
8fb3e588 AC |
3154 | If there are several symtabs at that PC (e.g. with include |
3155 | files), just want to know whether *any* of them have line | |
3156 | numbers. find_pc_line handles this. */ | |
95918acb AC |
3157 | { |
3158 | struct symtab_and_line tmp_sal; | |
8fb3e588 | 3159 | |
95918acb AC |
3160 | tmp_sal = find_pc_line (ecs->stop_func_start, 0); |
3161 | if (tmp_sal.line != 0) | |
3162 | { | |
3163 | step_into_function (ecs); | |
3164 | return; | |
3165 | } | |
3166 | } | |
3167 | ||
3168 | /* If we have no line number and the step-stop-if-no-debug is | |
8fb3e588 AC |
3169 | set, we stop the step so that the user has a chance to switch |
3170 | in assembly mode. */ | |
95918acb AC |
3171 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE && step_stop_if_no_debug) |
3172 | { | |
3173 | stop_step = 1; | |
3174 | print_stop_reason (END_STEPPING_RANGE, 0); | |
3175 | stop_stepping (ecs); | |
3176 | return; | |
3177 | } | |
3178 | ||
3179 | /* Set a breakpoint at callee's return address (the address at | |
8fb3e588 | 3180 | which the caller will resume). */ |
14e60db5 | 3181 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
95918acb | 3182 | keep_going (ecs); |
488f131b | 3183 | return; |
488f131b | 3184 | } |
c906108c | 3185 | |
488f131b JB |
3186 | /* If we're in the return path from a shared library trampoline, |
3187 | we want to proceed through the trampoline when stepping. */ | |
e76f05fa UW |
3188 | if (gdbarch_in_solib_return_trampoline (current_gdbarch, |
3189 | stop_pc, ecs->stop_func_name)) | |
488f131b | 3190 | { |
488f131b | 3191 | /* Determine where this trampoline returns. */ |
52f729a7 UW |
3192 | CORE_ADDR real_stop_pc; |
3193 | real_stop_pc = gdbarch_skip_trampoline_code | |
3194 | (current_gdbarch, get_current_frame (), stop_pc); | |
c906108c | 3195 | |
527159b7 | 3196 | if (debug_infrun) |
8a9de0e4 | 3197 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into solib return tramp\n"); |
527159b7 | 3198 | |
488f131b | 3199 | /* Only proceed through if we know where it's going. */ |
d764a824 | 3200 | if (real_stop_pc) |
488f131b JB |
3201 | { |
3202 | /* And put the step-breakpoint there and go until there. */ | |
3203 | struct symtab_and_line sr_sal; | |
3204 | ||
fe39c653 | 3205 | init_sal (&sr_sal); /* initialize to zeroes */ |
d764a824 | 3206 | sr_sal.pc = real_stop_pc; |
488f131b | 3207 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
44cbf7b5 AC |
3208 | |
3209 | /* Do not specify what the fp should be when we stop since | |
3210 | on some machines the prologue is where the new fp value | |
3211 | is established. */ | |
3212 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); | |
c906108c | 3213 | |
488f131b JB |
3214 | /* Restart without fiddling with the step ranges or |
3215 | other state. */ | |
3216 | keep_going (ecs); | |
3217 | return; | |
3218 | } | |
3219 | } | |
c906108c | 3220 | |
2afb61aa | 3221 | stop_pc_sal = find_pc_line (stop_pc, 0); |
7ed0fe66 | 3222 | |
1b2bfbb9 RC |
3223 | /* NOTE: tausq/2004-05-24: This if block used to be done before all |
3224 | the trampoline processing logic, however, there are some trampolines | |
3225 | that have no names, so we should do trampoline handling first. */ | |
3226 | if (step_over_calls == STEP_OVER_UNDEBUGGABLE | |
7ed0fe66 | 3227 | && ecs->stop_func_name == NULL |
2afb61aa | 3228 | && stop_pc_sal.line == 0) |
1b2bfbb9 | 3229 | { |
527159b7 | 3230 | if (debug_infrun) |
8a9de0e4 | 3231 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped into undebuggable function\n"); |
527159b7 | 3232 | |
1b2bfbb9 | 3233 | /* The inferior just stepped into, or returned to, an |
7ed0fe66 DJ |
3234 | undebuggable function (where there is no debugging information |
3235 | and no line number corresponding to the address where the | |
1b2bfbb9 RC |
3236 | inferior stopped). Since we want to skip this kind of code, |
3237 | we keep going until the inferior returns from this | |
14e60db5 DJ |
3238 | function - unless the user has asked us not to (via |
3239 | set step-mode) or we no longer know how to get back | |
3240 | to the call site. */ | |
3241 | if (step_stop_if_no_debug | |
eb2f4a08 | 3242 | || !frame_id_p (frame_unwind_id (get_current_frame ()))) |
1b2bfbb9 RC |
3243 | { |
3244 | /* If we have no line number and the step-stop-if-no-debug | |
3245 | is set, we stop the step so that the user has a chance to | |
3246 | switch in assembly mode. */ | |
3247 | stop_step = 1; | |
3248 | print_stop_reason (END_STEPPING_RANGE, 0); | |
3249 | stop_stepping (ecs); | |
3250 | return; | |
3251 | } | |
3252 | else | |
3253 | { | |
3254 | /* Set a breakpoint at callee's return address (the address | |
3255 | at which the caller will resume). */ | |
14e60db5 | 3256 | insert_step_resume_breakpoint_at_caller (get_current_frame ()); |
1b2bfbb9 RC |
3257 | keep_going (ecs); |
3258 | return; | |
3259 | } | |
3260 | } | |
3261 | ||
3262 | if (step_range_end == 1) | |
3263 | { | |
3264 | /* It is stepi or nexti. We always want to stop stepping after | |
3265 | one instruction. */ | |
527159b7 | 3266 | if (debug_infrun) |
8a9de0e4 | 3267 | fprintf_unfiltered (gdb_stdlog, "infrun: stepi/nexti\n"); |
1b2bfbb9 RC |
3268 | stop_step = 1; |
3269 | print_stop_reason (END_STEPPING_RANGE, 0); | |
3270 | stop_stepping (ecs); | |
3271 | return; | |
3272 | } | |
3273 | ||
2afb61aa | 3274 | if (stop_pc_sal.line == 0) |
488f131b JB |
3275 | { |
3276 | /* We have no line number information. That means to stop | |
3277 | stepping (does this always happen right after one instruction, | |
3278 | when we do "s" in a function with no line numbers, | |
3279 | or can this happen as a result of a return or longjmp?). */ | |
527159b7 | 3280 | if (debug_infrun) |
8a9de0e4 | 3281 | fprintf_unfiltered (gdb_stdlog, "infrun: no line number info\n"); |
488f131b JB |
3282 | stop_step = 1; |
3283 | print_stop_reason (END_STEPPING_RANGE, 0); | |
3284 | stop_stepping (ecs); | |
3285 | return; | |
3286 | } | |
c906108c | 3287 | |
2afb61aa PA |
3288 | if ((stop_pc == stop_pc_sal.pc) |
3289 | && (tss->current_line != stop_pc_sal.line | |
3290 | || tss->current_symtab != stop_pc_sal.symtab)) | |
488f131b JB |
3291 | { |
3292 | /* We are at the start of a different line. So stop. Note that | |
3293 | we don't stop if we step into the middle of a different line. | |
3294 | That is said to make things like for (;;) statements work | |
3295 | better. */ | |
527159b7 | 3296 | if (debug_infrun) |
8a9de0e4 | 3297 | fprintf_unfiltered (gdb_stdlog, "infrun: stepped to a different line\n"); |
488f131b JB |
3298 | stop_step = 1; |
3299 | print_stop_reason (END_STEPPING_RANGE, 0); | |
3300 | stop_stepping (ecs); | |
3301 | return; | |
3302 | } | |
c906108c | 3303 | |
488f131b | 3304 | /* We aren't done stepping. |
c906108c | 3305 | |
488f131b JB |
3306 | Optimize by setting the stepping range to the line. |
3307 | (We might not be in the original line, but if we entered a | |
3308 | new line in mid-statement, we continue stepping. This makes | |
3309 | things like for(;;) statements work better.) */ | |
c906108c | 3310 | |
2afb61aa PA |
3311 | step_range_start = stop_pc_sal.pc; |
3312 | step_range_end = stop_pc_sal.end; | |
aa0cd9c1 | 3313 | step_frame_id = get_frame_id (get_current_frame ()); |
2afb61aa PA |
3314 | tss->current_line = stop_pc_sal.line; |
3315 | tss->current_symtab = stop_pc_sal.symtab; | |
488f131b | 3316 | |
aa0cd9c1 AC |
3317 | /* In the case where we just stepped out of a function into the |
3318 | middle of a line of the caller, continue stepping, but | |
3319 | step_frame_id must be modified to current frame */ | |
65815ea1 AC |
3320 | #if 0 |
3321 | /* NOTE: cagney/2003-10-16: I think this frame ID inner test is too | |
3322 | generous. It will trigger on things like a step into a frameless | |
3323 | stackless leaf function. I think the logic should instead look | |
3324 | at the unwound frame ID has that should give a more robust | |
3325 | indication of what happened. */ | |
8fb3e588 AC |
3326 | if (step - ID == current - ID) |
3327 | still stepping in same function; | |
3328 | else if (step - ID == unwind (current - ID)) | |
3329 | stepped into a function; | |
3330 | else | |
3331 | stepped out of a function; | |
3332 | /* Of course this assumes that the frame ID unwind code is robust | |
3333 | and we're willing to introduce frame unwind logic into this | |
3334 | function. Fortunately, those days are nearly upon us. */ | |
65815ea1 | 3335 | #endif |
488f131b | 3336 | { |
09a7aba8 UW |
3337 | struct frame_info *frame = get_current_frame (); |
3338 | struct frame_id current_frame = get_frame_id (frame); | |
3339 | if (!(frame_id_inner (get_frame_arch (frame), current_frame, | |
3340 | step_frame_id))) | |
aa0cd9c1 | 3341 | step_frame_id = current_frame; |
488f131b | 3342 | } |
c906108c | 3343 | |
527159b7 | 3344 | if (debug_infrun) |
8a9de0e4 | 3345 | fprintf_unfiltered (gdb_stdlog, "infrun: keep going\n"); |
488f131b | 3346 | keep_going (ecs); |
104c1213 JM |
3347 | } |
3348 | ||
3349 | /* Are we in the middle of stepping? */ | |
3350 | ||
3351 | static int | |
0d1e5fa7 | 3352 | currently_stepping (struct thread_stepping_state *tss) |
104c1213 | 3353 | { |
611c83ae PA |
3354 | return (((step_range_end && step_resume_breakpoint == NULL) |
3355 | || stepping_over_breakpoint) | |
0d1e5fa7 | 3356 | || tss->stepping_through_solib_after_catch |
104c1213 JM |
3357 | || bpstat_should_step ()); |
3358 | } | |
c906108c | 3359 | |
c2c6d25f JM |
3360 | /* Subroutine call with source code we should not step over. Do step |
3361 | to the first line of code in it. */ | |
3362 | ||
3363 | static void | |
3364 | step_into_function (struct execution_control_state *ecs) | |
3365 | { | |
3366 | struct symtab *s; | |
2afb61aa | 3367 | struct symtab_and_line stop_func_sal, sr_sal; |
c2c6d25f JM |
3368 | |
3369 | s = find_pc_symtab (stop_pc); | |
3370 | if (s && s->language != language_asm) | |
a433963d UW |
3371 | ecs->stop_func_start = gdbarch_skip_prologue |
3372 | (current_gdbarch, ecs->stop_func_start); | |
c2c6d25f | 3373 | |
2afb61aa | 3374 | stop_func_sal = find_pc_line (ecs->stop_func_start, 0); |
c2c6d25f JM |
3375 | /* Use the step_resume_break to step until the end of the prologue, |
3376 | even if that involves jumps (as it seems to on the vax under | |
3377 | 4.2). */ | |
3378 | /* If the prologue ends in the middle of a source line, continue to | |
3379 | the end of that source line (if it is still within the function). | |
3380 | Otherwise, just go to end of prologue. */ | |
2afb61aa PA |
3381 | if (stop_func_sal.end |
3382 | && stop_func_sal.pc != ecs->stop_func_start | |
3383 | && stop_func_sal.end < ecs->stop_func_end) | |
3384 | ecs->stop_func_start = stop_func_sal.end; | |
c2c6d25f | 3385 | |
2dbd5e30 KB |
3386 | /* Architectures which require breakpoint adjustment might not be able |
3387 | to place a breakpoint at the computed address. If so, the test | |
3388 | ``ecs->stop_func_start == stop_pc'' will never succeed. Adjust | |
3389 | ecs->stop_func_start to an address at which a breakpoint may be | |
3390 | legitimately placed. | |
8fb3e588 | 3391 | |
2dbd5e30 KB |
3392 | Note: kevinb/2004-01-19: On FR-V, if this adjustment is not |
3393 | made, GDB will enter an infinite loop when stepping through | |
3394 | optimized code consisting of VLIW instructions which contain | |
3395 | subinstructions corresponding to different source lines. On | |
3396 | FR-V, it's not permitted to place a breakpoint on any but the | |
3397 | first subinstruction of a VLIW instruction. When a breakpoint is | |
3398 | set, GDB will adjust the breakpoint address to the beginning of | |
3399 | the VLIW instruction. Thus, we need to make the corresponding | |
3400 | adjustment here when computing the stop address. */ | |
8fb3e588 | 3401 | |
2dbd5e30 KB |
3402 | if (gdbarch_adjust_breakpoint_address_p (current_gdbarch)) |
3403 | { | |
3404 | ecs->stop_func_start | |
3405 | = gdbarch_adjust_breakpoint_address (current_gdbarch, | |
8fb3e588 | 3406 | ecs->stop_func_start); |
2dbd5e30 KB |
3407 | } |
3408 | ||
c2c6d25f JM |
3409 | if (ecs->stop_func_start == stop_pc) |
3410 | { | |
3411 | /* We are already there: stop now. */ | |
3412 | stop_step = 1; | |
488f131b | 3413 | print_stop_reason (END_STEPPING_RANGE, 0); |
c2c6d25f JM |
3414 | stop_stepping (ecs); |
3415 | return; | |
3416 | } | |
3417 | else | |
3418 | { | |
3419 | /* Put the step-breakpoint there and go until there. */ | |
fe39c653 | 3420 | init_sal (&sr_sal); /* initialize to zeroes */ |
c2c6d25f JM |
3421 | sr_sal.pc = ecs->stop_func_start; |
3422 | sr_sal.section = find_pc_overlay (ecs->stop_func_start); | |
44cbf7b5 | 3423 | |
c2c6d25f | 3424 | /* Do not specify what the fp should be when we stop since on |
488f131b JB |
3425 | some machines the prologue is where the new fp value is |
3426 | established. */ | |
44cbf7b5 | 3427 | insert_step_resume_breakpoint_at_sal (sr_sal, null_frame_id); |
c2c6d25f JM |
3428 | |
3429 | /* And make sure stepping stops right away then. */ | |
3430 | step_range_end = step_range_start; | |
3431 | } | |
3432 | keep_going (ecs); | |
3433 | } | |
d4f3574e | 3434 | |
d3169d93 | 3435 | /* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID. |
44cbf7b5 AC |
3436 | This is used to both functions and to skip over code. */ |
3437 | ||
3438 | static void | |
3439 | insert_step_resume_breakpoint_at_sal (struct symtab_and_line sr_sal, | |
3440 | struct frame_id sr_id) | |
3441 | { | |
611c83ae PA |
3442 | /* There should never be more than one step-resume or longjmp-resume |
3443 | breakpoint per thread, so we should never be setting a new | |
44cbf7b5 AC |
3444 | step_resume_breakpoint when one is already active. */ |
3445 | gdb_assert (step_resume_breakpoint == NULL); | |
d3169d93 DJ |
3446 | |
3447 | if (debug_infrun) | |
3448 | fprintf_unfiltered (gdb_stdlog, | |
3449 | "infrun: inserting step-resume breakpoint at 0x%s\n", | |
3450 | paddr_nz (sr_sal.pc)); | |
3451 | ||
44cbf7b5 AC |
3452 | step_resume_breakpoint = set_momentary_breakpoint (sr_sal, sr_id, |
3453 | bp_step_resume); | |
44cbf7b5 | 3454 | } |
7ce450bd | 3455 | |
d3169d93 | 3456 | /* Insert a "step-resume breakpoint" at RETURN_FRAME.pc. This is used |
14e60db5 | 3457 | to skip a potential signal handler. |
7ce450bd | 3458 | |
14e60db5 DJ |
3459 | This is called with the interrupted function's frame. The signal |
3460 | handler, when it returns, will resume the interrupted function at | |
3461 | RETURN_FRAME.pc. */ | |
d303a6c7 AC |
3462 | |
3463 | static void | |
44cbf7b5 | 3464 | insert_step_resume_breakpoint_at_frame (struct frame_info *return_frame) |
d303a6c7 AC |
3465 | { |
3466 | struct symtab_and_line sr_sal; | |
3467 | ||
f4c1edd8 | 3468 | gdb_assert (return_frame != NULL); |
d303a6c7 AC |
3469 | init_sal (&sr_sal); /* initialize to zeros */ |
3470 | ||
bf6ae464 UW |
3471 | sr_sal.pc = gdbarch_addr_bits_remove |
3472 | (current_gdbarch, get_frame_pc (return_frame)); | |
d303a6c7 AC |
3473 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
3474 | ||
44cbf7b5 | 3475 | insert_step_resume_breakpoint_at_sal (sr_sal, get_frame_id (return_frame)); |
d303a6c7 AC |
3476 | } |
3477 | ||
14e60db5 DJ |
3478 | /* Similar to insert_step_resume_breakpoint_at_frame, except |
3479 | but a breakpoint at the previous frame's PC. This is used to | |
3480 | skip a function after stepping into it (for "next" or if the called | |
3481 | function has no debugging information). | |
3482 | ||
3483 | The current function has almost always been reached by single | |
3484 | stepping a call or return instruction. NEXT_FRAME belongs to the | |
3485 | current function, and the breakpoint will be set at the caller's | |
3486 | resume address. | |
3487 | ||
3488 | This is a separate function rather than reusing | |
3489 | insert_step_resume_breakpoint_at_frame in order to avoid | |
3490 | get_prev_frame, which may stop prematurely (see the implementation | |
eb2f4a08 | 3491 | of frame_unwind_id for an example). */ |
14e60db5 DJ |
3492 | |
3493 | static void | |
3494 | insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame) | |
3495 | { | |
3496 | struct symtab_and_line sr_sal; | |
3497 | ||
3498 | /* We shouldn't have gotten here if we don't know where the call site | |
3499 | is. */ | |
eb2f4a08 | 3500 | gdb_assert (frame_id_p (frame_unwind_id (next_frame))); |
14e60db5 DJ |
3501 | |
3502 | init_sal (&sr_sal); /* initialize to zeros */ | |
3503 | ||
bf6ae464 | 3504 | sr_sal.pc = gdbarch_addr_bits_remove |
eb2f4a08 | 3505 | (current_gdbarch, frame_pc_unwind (next_frame)); |
14e60db5 DJ |
3506 | sr_sal.section = find_pc_overlay (sr_sal.pc); |
3507 | ||
eb2f4a08 | 3508 | insert_step_resume_breakpoint_at_sal (sr_sal, frame_unwind_id (next_frame)); |
14e60db5 DJ |
3509 | } |
3510 | ||
611c83ae PA |
3511 | /* Insert a "longjmp-resume" breakpoint at PC. This is used to set a |
3512 | new breakpoint at the target of a jmp_buf. The handling of | |
3513 | longjmp-resume uses the same mechanisms used for handling | |
3514 | "step-resume" breakpoints. */ | |
3515 | ||
3516 | static void | |
3517 | insert_longjmp_resume_breakpoint (CORE_ADDR pc) | |
3518 | { | |
3519 | /* There should never be more than one step-resume or longjmp-resume | |
3520 | breakpoint per thread, so we should never be setting a new | |
3521 | longjmp_resume_breakpoint when one is already active. */ | |
3522 | gdb_assert (step_resume_breakpoint == NULL); | |
3523 | ||
3524 | if (debug_infrun) | |
3525 | fprintf_unfiltered (gdb_stdlog, | |
3526 | "infrun: inserting longjmp-resume breakpoint at 0x%s\n", | |
3527 | paddr_nz (pc)); | |
3528 | ||
3529 | step_resume_breakpoint = | |
3530 | set_momentary_breakpoint_at_pc (pc, bp_longjmp_resume); | |
3531 | } | |
3532 | ||
104c1213 JM |
3533 | static void |
3534 | stop_stepping (struct execution_control_state *ecs) | |
3535 | { | |
527159b7 | 3536 | if (debug_infrun) |
8a9de0e4 | 3537 | fprintf_unfiltered (gdb_stdlog, "infrun: stop_stepping\n"); |
527159b7 | 3538 | |
cd0fc7c3 SS |
3539 | /* Let callers know we don't want to wait for the inferior anymore. */ |
3540 | ecs->wait_some_more = 0; | |
3541 | } | |
3542 | ||
d4f3574e SS |
3543 | /* This function handles various cases where we need to continue |
3544 | waiting for the inferior. */ | |
3545 | /* (Used to be the keep_going: label in the old wait_for_inferior) */ | |
3546 | ||
3547 | static void | |
3548 | keep_going (struct execution_control_state *ecs) | |
3549 | { | |
d4f3574e | 3550 | /* Save the pc before execution, to compare with pc after stop. */ |
488f131b | 3551 | prev_pc = read_pc (); /* Might have been DECR_AFTER_BREAK */ |
d4f3574e | 3552 | |
d4f3574e SS |
3553 | /* If we did not do break;, it means we should keep running the |
3554 | inferior and not return to debugger. */ | |
3555 | ||
ca67fcb8 | 3556 | if (stepping_over_breakpoint && stop_signal != TARGET_SIGNAL_TRAP) |
d4f3574e SS |
3557 | { |
3558 | /* We took a signal (which we are supposed to pass through to | |
488f131b JB |
3559 | the inferior, else we'd have done a break above) and we |
3560 | haven't yet gotten our trap. Simply continue. */ | |
0d1e5fa7 | 3561 | resume (currently_stepping (tss), stop_signal); |
d4f3574e SS |
3562 | } |
3563 | else | |
3564 | { | |
3565 | /* Either the trap was not expected, but we are continuing | |
488f131b JB |
3566 | anyway (the user asked that this signal be passed to the |
3567 | child) | |
3568 | -- or -- | |
3569 | The signal was SIGTRAP, e.g. it was our signal, but we | |
3570 | decided we should resume from it. | |
d4f3574e | 3571 | |
c36b740a | 3572 | We're going to run this baby now! |
d4f3574e | 3573 | |
c36b740a VP |
3574 | Note that insert_breakpoints won't try to re-insert |
3575 | already inserted breakpoints. Therefore, we don't | |
3576 | care if breakpoints were already inserted, or not. */ | |
3577 | ||
0d1e5fa7 | 3578 | if (tss->stepping_over_breakpoint) |
45e8c884 | 3579 | { |
237fc4c9 PA |
3580 | if (! use_displaced_stepping (current_gdbarch)) |
3581 | /* Since we can't do a displaced step, we have to remove | |
3582 | the breakpoint while we step it. To keep things | |
3583 | simple, we remove them all. */ | |
3584 | remove_breakpoints (); | |
45e8c884 VP |
3585 | } |
3586 | else | |
d4f3574e | 3587 | { |
e236ba44 | 3588 | struct gdb_exception e; |
569631c6 UW |
3589 | /* Stop stepping when inserting breakpoints |
3590 | has failed. */ | |
e236ba44 VP |
3591 | TRY_CATCH (e, RETURN_MASK_ERROR) |
3592 | { | |
3593 | insert_breakpoints (); | |
3594 | } | |
3595 | if (e.reason < 0) | |
d4f3574e SS |
3596 | { |
3597 | stop_stepping (ecs); | |
3598 | return; | |
3599 | } | |
d4f3574e SS |
3600 | } |
3601 | ||
0d1e5fa7 | 3602 | stepping_over_breakpoint = tss->stepping_over_breakpoint; |
d4f3574e SS |
3603 | |
3604 | /* Do not deliver SIGNAL_TRAP (except when the user explicitly | |
488f131b JB |
3605 | specifies that such a signal should be delivered to the |
3606 | target program). | |
3607 | ||
3608 | Typically, this would occure when a user is debugging a | |
3609 | target monitor on a simulator: the target monitor sets a | |
3610 | breakpoint; the simulator encounters this break-point and | |
3611 | halts the simulation handing control to GDB; GDB, noteing | |
3612 | that the break-point isn't valid, returns control back to the | |
3613 | simulator; the simulator then delivers the hardware | |
3614 | equivalent of a SIGNAL_TRAP to the program being debugged. */ | |
3615 | ||
3616 | if (stop_signal == TARGET_SIGNAL_TRAP && !signal_program[stop_signal]) | |
d4f3574e SS |
3617 | stop_signal = TARGET_SIGNAL_0; |
3618 | ||
d4f3574e | 3619 | |
0d1e5fa7 | 3620 | resume (currently_stepping (tss), stop_signal); |
d4f3574e SS |
3621 | } |
3622 | ||
488f131b | 3623 | prepare_to_wait (ecs); |
d4f3574e SS |
3624 | } |
3625 | ||
104c1213 JM |
3626 | /* This function normally comes after a resume, before |
3627 | handle_inferior_event exits. It takes care of any last bits of | |
3628 | housekeeping, and sets the all-important wait_some_more flag. */ | |
cd0fc7c3 | 3629 | |
104c1213 JM |
3630 | static void |
3631 | prepare_to_wait (struct execution_control_state *ecs) | |
cd0fc7c3 | 3632 | { |
527159b7 | 3633 | if (debug_infrun) |
8a9de0e4 | 3634 | fprintf_unfiltered (gdb_stdlog, "infrun: prepare_to_wait\n"); |
0d1e5fa7 | 3635 | if (infwait_state == infwait_normal_state) |
104c1213 JM |
3636 | { |
3637 | overlay_cache_invalid = 1; | |
3638 | ||
3639 | /* We have to invalidate the registers BEFORE calling | |
488f131b JB |
3640 | target_wait because they can be loaded from the target while |
3641 | in target_wait. This makes remote debugging a bit more | |
3642 | efficient for those targets that provide critical registers | |
3643 | as part of their normal status mechanism. */ | |
104c1213 JM |
3644 | |
3645 | registers_changed (); | |
0d1e5fa7 | 3646 | waiton_ptid = pid_to_ptid (-1); |
104c1213 JM |
3647 | } |
3648 | /* This is the old end of the while loop. Let everybody know we | |
3649 | want to wait for the inferior some more and get called again | |
3650 | soon. */ | |
3651 | ecs->wait_some_more = 1; | |
c906108c | 3652 | } |
11cf8741 JM |
3653 | |
3654 | /* Print why the inferior has stopped. We always print something when | |
3655 | the inferior exits, or receives a signal. The rest of the cases are | |
3656 | dealt with later on in normal_stop() and print_it_typical(). Ideally | |
3657 | there should be a call to this function from handle_inferior_event() | |
3658 | each time stop_stepping() is called.*/ | |
3659 | static void | |
3660 | print_stop_reason (enum inferior_stop_reason stop_reason, int stop_info) | |
3661 | { | |
3662 | switch (stop_reason) | |
3663 | { | |
11cf8741 JM |
3664 | case END_STEPPING_RANGE: |
3665 | /* We are done with a step/next/si/ni command. */ | |
3666 | /* For now print nothing. */ | |
fb40c209 | 3667 | /* Print a message only if not in the middle of doing a "step n" |
488f131b | 3668 | operation for n > 1 */ |
fb40c209 | 3669 | if (!step_multi || !stop_step) |
9dc5e2a9 | 3670 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3671 | ui_out_field_string |
3672 | (uiout, "reason", | |
3673 | async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE)); | |
11cf8741 | 3674 | break; |
11cf8741 JM |
3675 | case SIGNAL_EXITED: |
3676 | /* The inferior was terminated by a signal. */ | |
8b93c638 | 3677 | annotate_signalled (); |
9dc5e2a9 | 3678 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3679 | ui_out_field_string |
3680 | (uiout, "reason", | |
3681 | async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED)); | |
8b93c638 JM |
3682 | ui_out_text (uiout, "\nProgram terminated with signal "); |
3683 | annotate_signal_name (); | |
488f131b JB |
3684 | ui_out_field_string (uiout, "signal-name", |
3685 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
3686 | annotate_signal_name_end (); |
3687 | ui_out_text (uiout, ", "); | |
3688 | annotate_signal_string (); | |
488f131b JB |
3689 | ui_out_field_string (uiout, "signal-meaning", |
3690 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
3691 | annotate_signal_string_end (); |
3692 | ui_out_text (uiout, ".\n"); | |
3693 | ui_out_text (uiout, "The program no longer exists.\n"); | |
11cf8741 JM |
3694 | break; |
3695 | case EXITED: | |
3696 | /* The inferior program is finished. */ | |
8b93c638 JM |
3697 | annotate_exited (stop_info); |
3698 | if (stop_info) | |
3699 | { | |
9dc5e2a9 | 3700 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3701 | ui_out_field_string (uiout, "reason", |
3702 | async_reason_lookup (EXEC_ASYNC_EXITED)); | |
8b93c638 | 3703 | ui_out_text (uiout, "\nProgram exited with code "); |
488f131b JB |
3704 | ui_out_field_fmt (uiout, "exit-code", "0%o", |
3705 | (unsigned int) stop_info); | |
8b93c638 JM |
3706 | ui_out_text (uiout, ".\n"); |
3707 | } | |
3708 | else | |
3709 | { | |
9dc5e2a9 | 3710 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3711 | ui_out_field_string |
3712 | (uiout, "reason", | |
3713 | async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY)); | |
8b93c638 JM |
3714 | ui_out_text (uiout, "\nProgram exited normally.\n"); |
3715 | } | |
f17517ea AS |
3716 | /* Support the --return-child-result option. */ |
3717 | return_child_result_value = stop_info; | |
11cf8741 JM |
3718 | break; |
3719 | case SIGNAL_RECEIVED: | |
3720 | /* Signal received. The signal table tells us to print about | |
3721 | it. */ | |
8b93c638 JM |
3722 | annotate_signal (); |
3723 | ui_out_text (uiout, "\nProgram received signal "); | |
3724 | annotate_signal_name (); | |
84c6c83c | 3725 | if (ui_out_is_mi_like_p (uiout)) |
034dad6f BR |
3726 | ui_out_field_string |
3727 | (uiout, "reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED)); | |
488f131b JB |
3728 | ui_out_field_string (uiout, "signal-name", |
3729 | target_signal_to_name (stop_info)); | |
8b93c638 JM |
3730 | annotate_signal_name_end (); |
3731 | ui_out_text (uiout, ", "); | |
3732 | annotate_signal_string (); | |
488f131b JB |
3733 | ui_out_field_string (uiout, "signal-meaning", |
3734 | target_signal_to_string (stop_info)); | |
8b93c638 JM |
3735 | annotate_signal_string_end (); |
3736 | ui_out_text (uiout, ".\n"); | |
11cf8741 JM |
3737 | break; |
3738 | default: | |
8e65ff28 | 3739 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 3740 | _("print_stop_reason: unrecognized enum value")); |
11cf8741 JM |
3741 | break; |
3742 | } | |
3743 | } | |
c906108c | 3744 | \f |
43ff13b4 | 3745 | |
c906108c SS |
3746 | /* Here to return control to GDB when the inferior stops for real. |
3747 | Print appropriate messages, remove breakpoints, give terminal our modes. | |
3748 | ||
3749 | STOP_PRINT_FRAME nonzero means print the executing frame | |
3750 | (pc, function, args, file, line number and line text). | |
3751 | BREAKPOINTS_FAILED nonzero means stop was due to error | |
3752 | attempting to insert breakpoints. */ | |
3753 | ||
3754 | void | |
96baa820 | 3755 | normal_stop (void) |
c906108c | 3756 | { |
73b65bb0 DJ |
3757 | struct target_waitstatus last; |
3758 | ptid_t last_ptid; | |
3759 | ||
3760 | get_last_target_status (&last_ptid, &last); | |
3761 | ||
4f8d22e3 PA |
3762 | /* In non-stop mode, we don't want GDB to switch threads behind the |
3763 | user's back, to avoid races where the user is typing a command to | |
3764 | apply to thread x, but GDB switches to thread y before the user | |
3765 | finishes entering the command. */ | |
3766 | ||
c906108c SS |
3767 | /* As with the notification of thread events, we want to delay |
3768 | notifying the user that we've switched thread context until | |
3769 | the inferior actually stops. | |
3770 | ||
73b65bb0 DJ |
3771 | There's no point in saying anything if the inferior has exited. |
3772 | Note that SIGNALLED here means "exited with a signal", not | |
3773 | "received a signal". */ | |
4f8d22e3 PA |
3774 | if (!non_stop |
3775 | && !ptid_equal (previous_inferior_ptid, inferior_ptid) | |
73b65bb0 DJ |
3776 | && target_has_execution |
3777 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
3778 | && last.kind != TARGET_WAITKIND_EXITED) | |
c906108c SS |
3779 | { |
3780 | target_terminal_ours_for_output (); | |
a3f17187 | 3781 | printf_filtered (_("[Switching to %s]\n"), |
c95310c6 | 3782 | target_pid_to_str (inferior_ptid)); |
b8fa951a | 3783 | annotate_thread_changed (); |
39f77062 | 3784 | previous_inferior_ptid = inferior_ptid; |
c906108c | 3785 | } |
c906108c | 3786 | |
4fa8626c | 3787 | /* NOTE drow/2004-01-17: Is this still necessary? */ |
c906108c SS |
3788 | /* Make sure that the current_frame's pc is correct. This |
3789 | is a correction for setting up the frame info before doing | |
b798847d | 3790 | gdbarch_decr_pc_after_break */ |
b87efeee AC |
3791 | if (target_has_execution) |
3792 | /* FIXME: cagney/2002-12-06: Has the PC changed? Thanks to | |
b798847d | 3793 | gdbarch_decr_pc_after_break, the program counter can change. Ask the |
b87efeee | 3794 | frame code to check for this and sort out any resultant mess. |
b798847d | 3795 | gdbarch_decr_pc_after_break needs to just go away. */ |
2f107107 | 3796 | deprecated_update_frame_pc_hack (get_current_frame (), read_pc ()); |
c906108c | 3797 | |
74960c60 | 3798 | if (!breakpoints_always_inserted_mode () && target_has_execution) |
c906108c SS |
3799 | { |
3800 | if (remove_breakpoints ()) | |
3801 | { | |
3802 | target_terminal_ours_for_output (); | |
a3f17187 AC |
3803 | printf_filtered (_("\ |
3804 | Cannot remove breakpoints because program is no longer writable.\n\ | |
3805 | It might be running in another process.\n\ | |
3806 | Further execution is probably impossible.\n")); | |
c906108c SS |
3807 | } |
3808 | } | |
c906108c | 3809 | |
c906108c SS |
3810 | /* If an auto-display called a function and that got a signal, |
3811 | delete that auto-display to avoid an infinite recursion. */ | |
3812 | ||
3813 | if (stopped_by_random_signal) | |
3814 | disable_current_display (); | |
3815 | ||
3816 | /* Don't print a message if in the middle of doing a "step n" | |
3817 | operation for n > 1 */ | |
3818 | if (step_multi && stop_step) | |
3819 | goto done; | |
3820 | ||
3821 | target_terminal_ours (); | |
3822 | ||
7abfe014 DJ |
3823 | /* Set the current source location. This will also happen if we |
3824 | display the frame below, but the current SAL will be incorrect | |
3825 | during a user hook-stop function. */ | |
3826 | if (target_has_stack && !stop_stack_dummy) | |
3827 | set_current_sal_from_frame (get_current_frame (), 1); | |
3828 | ||
5913bcb0 AC |
3829 | /* Look up the hook_stop and run it (CLI internally handles problem |
3830 | of stop_command's pre-hook not existing). */ | |
3831 | if (stop_command) | |
3832 | catch_errors (hook_stop_stub, stop_command, | |
3833 | "Error while running hook_stop:\n", RETURN_MASK_ALL); | |
c906108c SS |
3834 | |
3835 | if (!target_has_stack) | |
3836 | { | |
3837 | ||
3838 | goto done; | |
3839 | } | |
3840 | ||
3841 | /* Select innermost stack frame - i.e., current frame is frame 0, | |
3842 | and current location is based on that. | |
3843 | Don't do this on return from a stack dummy routine, | |
3844 | or if the program has exited. */ | |
3845 | ||
3846 | if (!stop_stack_dummy) | |
3847 | { | |
0f7d239c | 3848 | select_frame (get_current_frame ()); |
c906108c SS |
3849 | |
3850 | /* Print current location without a level number, if | |
c5aa993b JM |
3851 | we have changed functions or hit a breakpoint. |
3852 | Print source line if we have one. | |
3853 | bpstat_print() contains the logic deciding in detail | |
3854 | what to print, based on the event(s) that just occurred. */ | |
c906108c | 3855 | |
d01a8610 AS |
3856 | /* If --batch-silent is enabled then there's no need to print the current |
3857 | source location, and to try risks causing an error message about | |
3858 | missing source files. */ | |
3859 | if (stop_print_frame && !batch_silent) | |
c906108c SS |
3860 | { |
3861 | int bpstat_ret; | |
3862 | int source_flag; | |
917317f4 | 3863 | int do_frame_printing = 1; |
c906108c SS |
3864 | |
3865 | bpstat_ret = bpstat_print (stop_bpstat); | |
917317f4 JM |
3866 | switch (bpstat_ret) |
3867 | { | |
3868 | case PRINT_UNKNOWN: | |
b0f4b84b DJ |
3869 | /* If we had hit a shared library event breakpoint, |
3870 | bpstat_print would print out this message. If we hit | |
3871 | an OS-level shared library event, do the same | |
3872 | thing. */ | |
3873 | if (last.kind == TARGET_WAITKIND_LOADED) | |
3874 | { | |
3875 | printf_filtered (_("Stopped due to shared library event\n")); | |
3876 | source_flag = SRC_LINE; /* something bogus */ | |
3877 | do_frame_printing = 0; | |
3878 | break; | |
3879 | } | |
3880 | ||
aa0cd9c1 | 3881 | /* FIXME: cagney/2002-12-01: Given that a frame ID does |
8fb3e588 AC |
3882 | (or should) carry around the function and does (or |
3883 | should) use that when doing a frame comparison. */ | |
917317f4 | 3884 | if (stop_step |
aa0cd9c1 AC |
3885 | && frame_id_eq (step_frame_id, |
3886 | get_frame_id (get_current_frame ())) | |
917317f4 | 3887 | && step_start_function == find_pc_function (stop_pc)) |
488f131b | 3888 | source_flag = SRC_LINE; /* finished step, just print source line */ |
917317f4 | 3889 | else |
488f131b | 3890 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3891 | break; |
3892 | case PRINT_SRC_AND_LOC: | |
488f131b | 3893 | source_flag = SRC_AND_LOC; /* print location and source line */ |
917317f4 JM |
3894 | break; |
3895 | case PRINT_SRC_ONLY: | |
c5394b80 | 3896 | source_flag = SRC_LINE; |
917317f4 JM |
3897 | break; |
3898 | case PRINT_NOTHING: | |
488f131b | 3899 | source_flag = SRC_LINE; /* something bogus */ |
917317f4 JM |
3900 | do_frame_printing = 0; |
3901 | break; | |
3902 | default: | |
e2e0b3e5 | 3903 | internal_error (__FILE__, __LINE__, _("Unknown value.")); |
917317f4 | 3904 | } |
c906108c | 3905 | |
9dc5e2a9 | 3906 | if (ui_out_is_mi_like_p (uiout)) |
b1a268e5 VP |
3907 | { |
3908 | ||
3909 | ui_out_field_int (uiout, "thread-id", | |
3910 | pid_to_thread_id (inferior_ptid)); | |
3911 | if (non_stop) | |
3912 | { | |
3913 | struct cleanup *back_to = make_cleanup_ui_out_list_begin_end | |
3914 | (uiout, "stopped-threads"); | |
3915 | ui_out_field_int (uiout, NULL, | |
3916 | pid_to_thread_id (inferior_ptid)); | |
3917 | do_cleanups (back_to); | |
3918 | } | |
3919 | else | |
3920 | ui_out_field_string (uiout, "stopped-threads", "all"); | |
3921 | } | |
c906108c SS |
3922 | /* The behavior of this routine with respect to the source |
3923 | flag is: | |
c5394b80 JM |
3924 | SRC_LINE: Print only source line |
3925 | LOCATION: Print only location | |
3926 | SRC_AND_LOC: Print location and source line */ | |
917317f4 | 3927 | if (do_frame_printing) |
b04f3ab4 | 3928 | print_stack_frame (get_selected_frame (NULL), 0, source_flag); |
c906108c SS |
3929 | |
3930 | /* Display the auto-display expressions. */ | |
3931 | do_displays (); | |
3932 | } | |
3933 | } | |
3934 | ||
3935 | /* Save the function value return registers, if we care. | |
3936 | We might be about to restore their previous contents. */ | |
3937 | if (proceed_to_finish) | |
d5c31457 UW |
3938 | { |
3939 | /* This should not be necessary. */ | |
3940 | if (stop_registers) | |
3941 | regcache_xfree (stop_registers); | |
3942 | ||
3943 | /* NB: The copy goes through to the target picking up the value of | |
3944 | all the registers. */ | |
3945 | stop_registers = regcache_dup (get_current_regcache ()); | |
3946 | } | |
c906108c SS |
3947 | |
3948 | if (stop_stack_dummy) | |
3949 | { | |
dbe9fe58 AC |
3950 | /* Pop the empty frame that contains the stack dummy. POP_FRAME |
3951 | ends with a setting of the current frame, so we can use that | |
3952 | next. */ | |
3953 | frame_pop (get_current_frame ()); | |
c906108c | 3954 | /* Set stop_pc to what it was before we called the function. |
c5aa993b JM |
3955 | Can't rely on restore_inferior_status because that only gets |
3956 | called if we don't stop in the called function. */ | |
c906108c | 3957 | stop_pc = read_pc (); |
0f7d239c | 3958 | select_frame (get_current_frame ()); |
c906108c SS |
3959 | } |
3960 | ||
c906108c SS |
3961 | done: |
3962 | annotate_stopped (); | |
8f6a8e84 | 3963 | if (!suppress_stop_observer && !step_multi) |
f5871ec0 | 3964 | observer_notify_normal_stop (stop_bpstat); |
2cec12e5 AR |
3965 | /* Delete the breakpoint we stopped at, if it wants to be deleted. |
3966 | Delete any breakpoint that is to be deleted at the next stop. */ | |
3967 | breakpoint_auto_delete (stop_bpstat); | |
94cc34af PA |
3968 | |
3969 | if (target_has_execution | |
3970 | && last.kind != TARGET_WAITKIND_SIGNALLED | |
3971 | && last.kind != TARGET_WAITKIND_EXITED) | |
3972 | { | |
3973 | if (!non_stop) | |
3974 | set_running (pid_to_ptid (-1), 0); | |
3975 | else | |
3976 | set_running (inferior_ptid, 0); | |
3977 | } | |
c906108c SS |
3978 | } |
3979 | ||
3980 | static int | |
96baa820 | 3981 | hook_stop_stub (void *cmd) |
c906108c | 3982 | { |
5913bcb0 | 3983 | execute_cmd_pre_hook ((struct cmd_list_element *) cmd); |
c906108c SS |
3984 | return (0); |
3985 | } | |
3986 | \f | |
c5aa993b | 3987 | int |
96baa820 | 3988 | signal_stop_state (int signo) |
c906108c | 3989 | { |
a0ef4274 DJ |
3990 | /* Always stop on signals if we're just gaining control of the |
3991 | program. */ | |
3992 | return signal_stop[signo] || stop_soon != NO_STOP_QUIETLY; | |
c906108c SS |
3993 | } |
3994 | ||
c5aa993b | 3995 | int |
96baa820 | 3996 | signal_print_state (int signo) |
c906108c SS |
3997 | { |
3998 | return signal_print[signo]; | |
3999 | } | |
4000 | ||
c5aa993b | 4001 | int |
96baa820 | 4002 | signal_pass_state (int signo) |
c906108c SS |
4003 | { |
4004 | return signal_program[signo]; | |
4005 | } | |
4006 | ||
488f131b | 4007 | int |
7bda5e4a | 4008 | signal_stop_update (int signo, int state) |
d4f3574e SS |
4009 | { |
4010 | int ret = signal_stop[signo]; | |
4011 | signal_stop[signo] = state; | |
4012 | return ret; | |
4013 | } | |
4014 | ||
488f131b | 4015 | int |
7bda5e4a | 4016 | signal_print_update (int signo, int state) |
d4f3574e SS |
4017 | { |
4018 | int ret = signal_print[signo]; | |
4019 | signal_print[signo] = state; | |
4020 | return ret; | |
4021 | } | |
4022 | ||
488f131b | 4023 | int |
7bda5e4a | 4024 | signal_pass_update (int signo, int state) |
d4f3574e SS |
4025 | { |
4026 | int ret = signal_program[signo]; | |
4027 | signal_program[signo] = state; | |
4028 | return ret; | |
4029 | } | |
4030 | ||
c906108c | 4031 | static void |
96baa820 | 4032 | sig_print_header (void) |
c906108c | 4033 | { |
a3f17187 AC |
4034 | printf_filtered (_("\ |
4035 | Signal Stop\tPrint\tPass to program\tDescription\n")); | |
c906108c SS |
4036 | } |
4037 | ||
4038 | static void | |
96baa820 | 4039 | sig_print_info (enum target_signal oursig) |
c906108c SS |
4040 | { |
4041 | char *name = target_signal_to_name (oursig); | |
4042 | int name_padding = 13 - strlen (name); | |
96baa820 | 4043 | |
c906108c SS |
4044 | if (name_padding <= 0) |
4045 | name_padding = 0; | |
4046 | ||
4047 | printf_filtered ("%s", name); | |
488f131b | 4048 | printf_filtered ("%*.*s ", name_padding, name_padding, " "); |
c906108c SS |
4049 | printf_filtered ("%s\t", signal_stop[oursig] ? "Yes" : "No"); |
4050 | printf_filtered ("%s\t", signal_print[oursig] ? "Yes" : "No"); | |
4051 | printf_filtered ("%s\t\t", signal_program[oursig] ? "Yes" : "No"); | |
4052 | printf_filtered ("%s\n", target_signal_to_string (oursig)); | |
4053 | } | |
4054 | ||
4055 | /* Specify how various signals in the inferior should be handled. */ | |
4056 | ||
4057 | static void | |
96baa820 | 4058 | handle_command (char *args, int from_tty) |
c906108c SS |
4059 | { |
4060 | char **argv; | |
4061 | int digits, wordlen; | |
4062 | int sigfirst, signum, siglast; | |
4063 | enum target_signal oursig; | |
4064 | int allsigs; | |
4065 | int nsigs; | |
4066 | unsigned char *sigs; | |
4067 | struct cleanup *old_chain; | |
4068 | ||
4069 | if (args == NULL) | |
4070 | { | |
e2e0b3e5 | 4071 | error_no_arg (_("signal to handle")); |
c906108c SS |
4072 | } |
4073 | ||
4074 | /* Allocate and zero an array of flags for which signals to handle. */ | |
4075 | ||
4076 | nsigs = (int) TARGET_SIGNAL_LAST; | |
4077 | sigs = (unsigned char *) alloca (nsigs); | |
4078 | memset (sigs, 0, nsigs); | |
4079 | ||
4080 | /* Break the command line up into args. */ | |
4081 | ||
4082 | argv = buildargv (args); | |
4083 | if (argv == NULL) | |
4084 | { | |
4085 | nomem (0); | |
4086 | } | |
7a292a7a | 4087 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
4088 | |
4089 | /* Walk through the args, looking for signal oursigs, signal names, and | |
4090 | actions. Signal numbers and signal names may be interspersed with | |
4091 | actions, with the actions being performed for all signals cumulatively | |
4092 | specified. Signal ranges can be specified as <LOW>-<HIGH>. */ | |
4093 | ||
4094 | while (*argv != NULL) | |
4095 | { | |
4096 | wordlen = strlen (*argv); | |
4097 | for (digits = 0; isdigit ((*argv)[digits]); digits++) | |
4098 | {; | |
4099 | } | |
4100 | allsigs = 0; | |
4101 | sigfirst = siglast = -1; | |
4102 | ||
4103 | if (wordlen >= 1 && !strncmp (*argv, "all", wordlen)) | |
4104 | { | |
4105 | /* Apply action to all signals except those used by the | |
4106 | debugger. Silently skip those. */ | |
4107 | allsigs = 1; | |
4108 | sigfirst = 0; | |
4109 | siglast = nsigs - 1; | |
4110 | } | |
4111 | else if (wordlen >= 1 && !strncmp (*argv, "stop", wordlen)) | |
4112 | { | |
4113 | SET_SIGS (nsigs, sigs, signal_stop); | |
4114 | SET_SIGS (nsigs, sigs, signal_print); | |
4115 | } | |
4116 | else if (wordlen >= 1 && !strncmp (*argv, "ignore", wordlen)) | |
4117 | { | |
4118 | UNSET_SIGS (nsigs, sigs, signal_program); | |
4119 | } | |
4120 | else if (wordlen >= 2 && !strncmp (*argv, "print", wordlen)) | |
4121 | { | |
4122 | SET_SIGS (nsigs, sigs, signal_print); | |
4123 | } | |
4124 | else if (wordlen >= 2 && !strncmp (*argv, "pass", wordlen)) | |
4125 | { | |
4126 | SET_SIGS (nsigs, sigs, signal_program); | |
4127 | } | |
4128 | else if (wordlen >= 3 && !strncmp (*argv, "nostop", wordlen)) | |
4129 | { | |
4130 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
4131 | } | |
4132 | else if (wordlen >= 3 && !strncmp (*argv, "noignore", wordlen)) | |
4133 | { | |
4134 | SET_SIGS (nsigs, sigs, signal_program); | |
4135 | } | |
4136 | else if (wordlen >= 4 && !strncmp (*argv, "noprint", wordlen)) | |
4137 | { | |
4138 | UNSET_SIGS (nsigs, sigs, signal_print); | |
4139 | UNSET_SIGS (nsigs, sigs, signal_stop); | |
4140 | } | |
4141 | else if (wordlen >= 4 && !strncmp (*argv, "nopass", wordlen)) | |
4142 | { | |
4143 | UNSET_SIGS (nsigs, sigs, signal_program); | |
4144 | } | |
4145 | else if (digits > 0) | |
4146 | { | |
4147 | /* It is numeric. The numeric signal refers to our own | |
4148 | internal signal numbering from target.h, not to host/target | |
4149 | signal number. This is a feature; users really should be | |
4150 | using symbolic names anyway, and the common ones like | |
4151 | SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */ | |
4152 | ||
4153 | sigfirst = siglast = (int) | |
4154 | target_signal_from_command (atoi (*argv)); | |
4155 | if ((*argv)[digits] == '-') | |
4156 | { | |
4157 | siglast = (int) | |
4158 | target_signal_from_command (atoi ((*argv) + digits + 1)); | |
4159 | } | |
4160 | if (sigfirst > siglast) | |
4161 | { | |
4162 | /* Bet he didn't figure we'd think of this case... */ | |
4163 | signum = sigfirst; | |
4164 | sigfirst = siglast; | |
4165 | siglast = signum; | |
4166 | } | |
4167 | } | |
4168 | else | |
4169 | { | |
4170 | oursig = target_signal_from_name (*argv); | |
4171 | if (oursig != TARGET_SIGNAL_UNKNOWN) | |
4172 | { | |
4173 | sigfirst = siglast = (int) oursig; | |
4174 | } | |
4175 | else | |
4176 | { | |
4177 | /* Not a number and not a recognized flag word => complain. */ | |
8a3fe4f8 | 4178 | error (_("Unrecognized or ambiguous flag word: \"%s\"."), *argv); |
c906108c SS |
4179 | } |
4180 | } | |
4181 | ||
4182 | /* If any signal numbers or symbol names were found, set flags for | |
c5aa993b | 4183 | which signals to apply actions to. */ |
c906108c SS |
4184 | |
4185 | for (signum = sigfirst; signum >= 0 && signum <= siglast; signum++) | |
4186 | { | |
4187 | switch ((enum target_signal) signum) | |
4188 | { | |
4189 | case TARGET_SIGNAL_TRAP: | |
4190 | case TARGET_SIGNAL_INT: | |
4191 | if (!allsigs && !sigs[signum]) | |
4192 | { | |
4193 | if (query ("%s is used by the debugger.\n\ | |
488f131b | 4194 | Are you sure you want to change it? ", target_signal_to_name ((enum target_signal) signum))) |
c906108c SS |
4195 | { |
4196 | sigs[signum] = 1; | |
4197 | } | |
4198 | else | |
4199 | { | |
a3f17187 | 4200 | printf_unfiltered (_("Not confirmed, unchanged.\n")); |
c906108c SS |
4201 | gdb_flush (gdb_stdout); |
4202 | } | |
4203 | } | |
4204 | break; | |
4205 | case TARGET_SIGNAL_0: | |
4206 | case TARGET_SIGNAL_DEFAULT: | |
4207 | case TARGET_SIGNAL_UNKNOWN: | |
4208 | /* Make sure that "all" doesn't print these. */ | |
4209 | break; | |
4210 | default: | |
4211 | sigs[signum] = 1; | |
4212 | break; | |
4213 | } | |
4214 | } | |
4215 | ||
4216 | argv++; | |
4217 | } | |
4218 | ||
39f77062 | 4219 | target_notice_signals (inferior_ptid); |
c906108c SS |
4220 | |
4221 | if (from_tty) | |
4222 | { | |
4223 | /* Show the results. */ | |
4224 | sig_print_header (); | |
4225 | for (signum = 0; signum < nsigs; signum++) | |
4226 | { | |
4227 | if (sigs[signum]) | |
4228 | { | |
4229 | sig_print_info (signum); | |
4230 | } | |
4231 | } | |
4232 | } | |
4233 | ||
4234 | do_cleanups (old_chain); | |
4235 | } | |
4236 | ||
4237 | static void | |
96baa820 | 4238 | xdb_handle_command (char *args, int from_tty) |
c906108c SS |
4239 | { |
4240 | char **argv; | |
4241 | struct cleanup *old_chain; | |
4242 | ||
4243 | /* Break the command line up into args. */ | |
4244 | ||
4245 | argv = buildargv (args); | |
4246 | if (argv == NULL) | |
4247 | { | |
4248 | nomem (0); | |
4249 | } | |
7a292a7a | 4250 | old_chain = make_cleanup_freeargv (argv); |
c906108c SS |
4251 | if (argv[1] != (char *) NULL) |
4252 | { | |
4253 | char *argBuf; | |
4254 | int bufLen; | |
4255 | ||
4256 | bufLen = strlen (argv[0]) + 20; | |
4257 | argBuf = (char *) xmalloc (bufLen); | |
4258 | if (argBuf) | |
4259 | { | |
4260 | int validFlag = 1; | |
4261 | enum target_signal oursig; | |
4262 | ||
4263 | oursig = target_signal_from_name (argv[0]); | |
4264 | memset (argBuf, 0, bufLen); | |
4265 | if (strcmp (argv[1], "Q") == 0) | |
4266 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
4267 | else | |
4268 | { | |
4269 | if (strcmp (argv[1], "s") == 0) | |
4270 | { | |
4271 | if (!signal_stop[oursig]) | |
4272 | sprintf (argBuf, "%s %s", argv[0], "stop"); | |
4273 | else | |
4274 | sprintf (argBuf, "%s %s", argv[0], "nostop"); | |
4275 | } | |
4276 | else if (strcmp (argv[1], "i") == 0) | |
4277 | { | |
4278 | if (!signal_program[oursig]) | |
4279 | sprintf (argBuf, "%s %s", argv[0], "pass"); | |
4280 | else | |
4281 | sprintf (argBuf, "%s %s", argv[0], "nopass"); | |
4282 | } | |
4283 | else if (strcmp (argv[1], "r") == 0) | |
4284 | { | |
4285 | if (!signal_print[oursig]) | |
4286 | sprintf (argBuf, "%s %s", argv[0], "print"); | |
4287 | else | |
4288 | sprintf (argBuf, "%s %s", argv[0], "noprint"); | |
4289 | } | |
4290 | else | |
4291 | validFlag = 0; | |
4292 | } | |
4293 | if (validFlag) | |
4294 | handle_command (argBuf, from_tty); | |
4295 | else | |
a3f17187 | 4296 | printf_filtered (_("Invalid signal handling flag.\n")); |
c906108c | 4297 | if (argBuf) |
b8c9b27d | 4298 | xfree (argBuf); |
c906108c SS |
4299 | } |
4300 | } | |
4301 | do_cleanups (old_chain); | |
4302 | } | |
4303 | ||
4304 | /* Print current contents of the tables set by the handle command. | |
4305 | It is possible we should just be printing signals actually used | |
4306 | by the current target (but for things to work right when switching | |
4307 | targets, all signals should be in the signal tables). */ | |
4308 | ||
4309 | static void | |
96baa820 | 4310 | signals_info (char *signum_exp, int from_tty) |
c906108c SS |
4311 | { |
4312 | enum target_signal oursig; | |
4313 | sig_print_header (); | |
4314 | ||
4315 | if (signum_exp) | |
4316 | { | |
4317 | /* First see if this is a symbol name. */ | |
4318 | oursig = target_signal_from_name (signum_exp); | |
4319 | if (oursig == TARGET_SIGNAL_UNKNOWN) | |
4320 | { | |
4321 | /* No, try numeric. */ | |
4322 | oursig = | |
bb518678 | 4323 | target_signal_from_command (parse_and_eval_long (signum_exp)); |
c906108c SS |
4324 | } |
4325 | sig_print_info (oursig); | |
4326 | return; | |
4327 | } | |
4328 | ||
4329 | printf_filtered ("\n"); | |
4330 | /* These ugly casts brought to you by the native VAX compiler. */ | |
4331 | for (oursig = TARGET_SIGNAL_FIRST; | |
4332 | (int) oursig < (int) TARGET_SIGNAL_LAST; | |
4333 | oursig = (enum target_signal) ((int) oursig + 1)) | |
4334 | { | |
4335 | QUIT; | |
4336 | ||
4337 | if (oursig != TARGET_SIGNAL_UNKNOWN | |
488f131b | 4338 | && oursig != TARGET_SIGNAL_DEFAULT && oursig != TARGET_SIGNAL_0) |
c906108c SS |
4339 | sig_print_info (oursig); |
4340 | } | |
4341 | ||
a3f17187 | 4342 | printf_filtered (_("\nUse the \"handle\" command to change these tables.\n")); |
c906108c SS |
4343 | } |
4344 | \f | |
7a292a7a SS |
4345 | struct inferior_status |
4346 | { | |
4347 | enum target_signal stop_signal; | |
4348 | CORE_ADDR stop_pc; | |
4349 | bpstat stop_bpstat; | |
4350 | int stop_step; | |
4351 | int stop_stack_dummy; | |
4352 | int stopped_by_random_signal; | |
ca67fcb8 | 4353 | int stepping_over_breakpoint; |
7a292a7a SS |
4354 | CORE_ADDR step_range_start; |
4355 | CORE_ADDR step_range_end; | |
aa0cd9c1 | 4356 | struct frame_id step_frame_id; |
5fbbeb29 | 4357 | enum step_over_calls_kind step_over_calls; |
7a292a7a SS |
4358 | CORE_ADDR step_resume_break_address; |
4359 | int stop_after_trap; | |
c0236d92 | 4360 | int stop_soon; |
7a292a7a SS |
4361 | |
4362 | /* These are here because if call_function_by_hand has written some | |
4363 | registers and then decides to call error(), we better not have changed | |
4364 | any registers. */ | |
72cec141 | 4365 | struct regcache *registers; |
7a292a7a | 4366 | |
101dcfbe AC |
4367 | /* A frame unique identifier. */ |
4368 | struct frame_id selected_frame_id; | |
4369 | ||
7a292a7a SS |
4370 | int breakpoint_proceeded; |
4371 | int restore_stack_info; | |
4372 | int proceed_to_finish; | |
4373 | }; | |
4374 | ||
7a292a7a | 4375 | void |
96baa820 JM |
4376 | write_inferior_status_register (struct inferior_status *inf_status, int regno, |
4377 | LONGEST val) | |
7a292a7a | 4378 | { |
3acba339 | 4379 | int size = register_size (current_gdbarch, regno); |
7a292a7a SS |
4380 | void *buf = alloca (size); |
4381 | store_signed_integer (buf, size, val); | |
0818c12a | 4382 | regcache_raw_write (inf_status->registers, regno, buf); |
7a292a7a SS |
4383 | } |
4384 | ||
c906108c SS |
4385 | /* Save all of the information associated with the inferior<==>gdb |
4386 | connection. INF_STATUS is a pointer to a "struct inferior_status" | |
4387 | (defined in inferior.h). */ | |
4388 | ||
7a292a7a | 4389 | struct inferior_status * |
96baa820 | 4390 | save_inferior_status (int restore_stack_info) |
c906108c | 4391 | { |
72cec141 | 4392 | struct inferior_status *inf_status = XMALLOC (struct inferior_status); |
7a292a7a | 4393 | |
c906108c SS |
4394 | inf_status->stop_signal = stop_signal; |
4395 | inf_status->stop_pc = stop_pc; | |
4396 | inf_status->stop_step = stop_step; | |
4397 | inf_status->stop_stack_dummy = stop_stack_dummy; | |
4398 | inf_status->stopped_by_random_signal = stopped_by_random_signal; | |
ca67fcb8 | 4399 | inf_status->stepping_over_breakpoint = stepping_over_breakpoint; |
c906108c SS |
4400 | inf_status->step_range_start = step_range_start; |
4401 | inf_status->step_range_end = step_range_end; | |
aa0cd9c1 | 4402 | inf_status->step_frame_id = step_frame_id; |
c906108c SS |
4403 | inf_status->step_over_calls = step_over_calls; |
4404 | inf_status->stop_after_trap = stop_after_trap; | |
c0236d92 | 4405 | inf_status->stop_soon = stop_soon; |
c906108c SS |
4406 | /* Save original bpstat chain here; replace it with copy of chain. |
4407 | If caller's caller is walking the chain, they'll be happier if we | |
7a292a7a SS |
4408 | hand them back the original chain when restore_inferior_status is |
4409 | called. */ | |
c906108c SS |
4410 | inf_status->stop_bpstat = stop_bpstat; |
4411 | stop_bpstat = bpstat_copy (stop_bpstat); | |
4412 | inf_status->breakpoint_proceeded = breakpoint_proceeded; | |
4413 | inf_status->restore_stack_info = restore_stack_info; | |
4414 | inf_status->proceed_to_finish = proceed_to_finish; | |
c5aa993b | 4415 | |
594f7785 | 4416 | inf_status->registers = regcache_dup (get_current_regcache ()); |
c906108c | 4417 | |
206415a3 | 4418 | inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL)); |
7a292a7a | 4419 | return inf_status; |
c906108c SS |
4420 | } |
4421 | ||
c906108c | 4422 | static int |
96baa820 | 4423 | restore_selected_frame (void *args) |
c906108c | 4424 | { |
488f131b | 4425 | struct frame_id *fid = (struct frame_id *) args; |
c906108c | 4426 | struct frame_info *frame; |
c906108c | 4427 | |
101dcfbe | 4428 | frame = frame_find_by_id (*fid); |
c906108c | 4429 | |
aa0cd9c1 AC |
4430 | /* If inf_status->selected_frame_id is NULL, there was no previously |
4431 | selected frame. */ | |
101dcfbe | 4432 | if (frame == NULL) |
c906108c | 4433 | { |
8a3fe4f8 | 4434 | warning (_("Unable to restore previously selected frame.")); |
c906108c SS |
4435 | return 0; |
4436 | } | |
4437 | ||
0f7d239c | 4438 | select_frame (frame); |
c906108c SS |
4439 | |
4440 | return (1); | |
4441 | } | |
4442 | ||
4443 | void | |
96baa820 | 4444 | restore_inferior_status (struct inferior_status *inf_status) |
c906108c SS |
4445 | { |
4446 | stop_signal = inf_status->stop_signal; | |
4447 | stop_pc = inf_status->stop_pc; | |
4448 | stop_step = inf_status->stop_step; | |
4449 | stop_stack_dummy = inf_status->stop_stack_dummy; | |
4450 | stopped_by_random_signal = inf_status->stopped_by_random_signal; | |
ca67fcb8 | 4451 | stepping_over_breakpoint = inf_status->stepping_over_breakpoint; |
c906108c SS |
4452 | step_range_start = inf_status->step_range_start; |
4453 | step_range_end = inf_status->step_range_end; | |
aa0cd9c1 | 4454 | step_frame_id = inf_status->step_frame_id; |
c906108c SS |
4455 | step_over_calls = inf_status->step_over_calls; |
4456 | stop_after_trap = inf_status->stop_after_trap; | |
c0236d92 | 4457 | stop_soon = inf_status->stop_soon; |
c906108c SS |
4458 | bpstat_clear (&stop_bpstat); |
4459 | stop_bpstat = inf_status->stop_bpstat; | |
4460 | breakpoint_proceeded = inf_status->breakpoint_proceeded; | |
4461 | proceed_to_finish = inf_status->proceed_to_finish; | |
4462 | ||
c906108c SS |
4463 | /* The inferior can be gone if the user types "print exit(0)" |
4464 | (and perhaps other times). */ | |
4465 | if (target_has_execution) | |
72cec141 | 4466 | /* NB: The register write goes through to the target. */ |
594f7785 | 4467 | regcache_cpy (get_current_regcache (), inf_status->registers); |
72cec141 | 4468 | regcache_xfree (inf_status->registers); |
c906108c | 4469 | |
c906108c SS |
4470 | /* FIXME: If we are being called after stopping in a function which |
4471 | is called from gdb, we should not be trying to restore the | |
4472 | selected frame; it just prints a spurious error message (The | |
4473 | message is useful, however, in detecting bugs in gdb (like if gdb | |
4474 | clobbers the stack)). In fact, should we be restoring the | |
4475 | inferior status at all in that case? . */ | |
4476 | ||
4477 | if (target_has_stack && inf_status->restore_stack_info) | |
4478 | { | |
c906108c | 4479 | /* The point of catch_errors is that if the stack is clobbered, |
101dcfbe AC |
4480 | walking the stack might encounter a garbage pointer and |
4481 | error() trying to dereference it. */ | |
488f131b JB |
4482 | if (catch_errors |
4483 | (restore_selected_frame, &inf_status->selected_frame_id, | |
4484 | "Unable to restore previously selected frame:\n", | |
4485 | RETURN_MASK_ERROR) == 0) | |
c906108c SS |
4486 | /* Error in restoring the selected frame. Select the innermost |
4487 | frame. */ | |
0f7d239c | 4488 | select_frame (get_current_frame ()); |
c906108c SS |
4489 | |
4490 | } | |
c906108c | 4491 | |
72cec141 | 4492 | xfree (inf_status); |
7a292a7a | 4493 | } |
c906108c | 4494 | |
74b7792f AC |
4495 | static void |
4496 | do_restore_inferior_status_cleanup (void *sts) | |
4497 | { | |
4498 | restore_inferior_status (sts); | |
4499 | } | |
4500 | ||
4501 | struct cleanup * | |
4502 | make_cleanup_restore_inferior_status (struct inferior_status *inf_status) | |
4503 | { | |
4504 | return make_cleanup (do_restore_inferior_status_cleanup, inf_status); | |
4505 | } | |
4506 | ||
c906108c | 4507 | void |
96baa820 | 4508 | discard_inferior_status (struct inferior_status *inf_status) |
7a292a7a SS |
4509 | { |
4510 | /* See save_inferior_status for info on stop_bpstat. */ | |
4511 | bpstat_clear (&inf_status->stop_bpstat); | |
72cec141 | 4512 | regcache_xfree (inf_status->registers); |
72cec141 | 4513 | xfree (inf_status); |
7a292a7a SS |
4514 | } |
4515 | ||
47932f85 | 4516 | int |
3a3e9ee3 | 4517 | inferior_has_forked (ptid_t pid, ptid_t *child_pid) |
47932f85 DJ |
4518 | { |
4519 | struct target_waitstatus last; | |
4520 | ptid_t last_ptid; | |
4521 | ||
4522 | get_last_target_status (&last_ptid, &last); | |
4523 | ||
4524 | if (last.kind != TARGET_WAITKIND_FORKED) | |
4525 | return 0; | |
4526 | ||
3a3e9ee3 | 4527 | if (!ptid_equal (last_ptid, pid)) |
47932f85 DJ |
4528 | return 0; |
4529 | ||
4530 | *child_pid = last.value.related_pid; | |
4531 | return 1; | |
4532 | } | |
4533 | ||
4534 | int | |
3a3e9ee3 | 4535 | inferior_has_vforked (ptid_t pid, ptid_t *child_pid) |
47932f85 DJ |
4536 | { |
4537 | struct target_waitstatus last; | |
4538 | ptid_t last_ptid; | |
4539 | ||
4540 | get_last_target_status (&last_ptid, &last); | |
4541 | ||
4542 | if (last.kind != TARGET_WAITKIND_VFORKED) | |
4543 | return 0; | |
4544 | ||
3a3e9ee3 | 4545 | if (!ptid_equal (last_ptid, pid)) |
47932f85 DJ |
4546 | return 0; |
4547 | ||
4548 | *child_pid = last.value.related_pid; | |
4549 | return 1; | |
4550 | } | |
4551 | ||
4552 | int | |
3a3e9ee3 | 4553 | inferior_has_execd (ptid_t pid, char **execd_pathname) |
47932f85 DJ |
4554 | { |
4555 | struct target_waitstatus last; | |
4556 | ptid_t last_ptid; | |
4557 | ||
4558 | get_last_target_status (&last_ptid, &last); | |
4559 | ||
4560 | if (last.kind != TARGET_WAITKIND_EXECD) | |
4561 | return 0; | |
4562 | ||
3a3e9ee3 | 4563 | if (!ptid_equal (last_ptid, pid)) |
47932f85 DJ |
4564 | return 0; |
4565 | ||
4566 | *execd_pathname = xstrdup (last.value.execd_pathname); | |
4567 | return 1; | |
4568 | } | |
4569 | ||
ca6724c1 KB |
4570 | /* Oft used ptids */ |
4571 | ptid_t null_ptid; | |
4572 | ptid_t minus_one_ptid; | |
4573 | ||
4574 | /* Create a ptid given the necessary PID, LWP, and TID components. */ | |
488f131b | 4575 | |
ca6724c1 KB |
4576 | ptid_t |
4577 | ptid_build (int pid, long lwp, long tid) | |
4578 | { | |
4579 | ptid_t ptid; | |
4580 | ||
4581 | ptid.pid = pid; | |
4582 | ptid.lwp = lwp; | |
4583 | ptid.tid = tid; | |
4584 | return ptid; | |
4585 | } | |
4586 | ||
4587 | /* Create a ptid from just a pid. */ | |
4588 | ||
4589 | ptid_t | |
4590 | pid_to_ptid (int pid) | |
4591 | { | |
4592 | return ptid_build (pid, 0, 0); | |
4593 | } | |
4594 | ||
4595 | /* Fetch the pid (process id) component from a ptid. */ | |
4596 | ||
4597 | int | |
4598 | ptid_get_pid (ptid_t ptid) | |
4599 | { | |
4600 | return ptid.pid; | |
4601 | } | |
4602 | ||
4603 | /* Fetch the lwp (lightweight process) component from a ptid. */ | |
4604 | ||
4605 | long | |
4606 | ptid_get_lwp (ptid_t ptid) | |
4607 | { | |
4608 | return ptid.lwp; | |
4609 | } | |
4610 | ||
4611 | /* Fetch the tid (thread id) component from a ptid. */ | |
4612 | ||
4613 | long | |
4614 | ptid_get_tid (ptid_t ptid) | |
4615 | { | |
4616 | return ptid.tid; | |
4617 | } | |
4618 | ||
4619 | /* ptid_equal() is used to test equality of two ptids. */ | |
4620 | ||
4621 | int | |
4622 | ptid_equal (ptid_t ptid1, ptid_t ptid2) | |
4623 | { | |
4624 | return (ptid1.pid == ptid2.pid && ptid1.lwp == ptid2.lwp | |
488f131b | 4625 | && ptid1.tid == ptid2.tid); |
ca6724c1 KB |
4626 | } |
4627 | ||
4628 | /* restore_inferior_ptid() will be used by the cleanup machinery | |
4629 | to restore the inferior_ptid value saved in a call to | |
4630 | save_inferior_ptid(). */ | |
ce696e05 KB |
4631 | |
4632 | static void | |
4633 | restore_inferior_ptid (void *arg) | |
4634 | { | |
4635 | ptid_t *saved_ptid_ptr = arg; | |
4636 | inferior_ptid = *saved_ptid_ptr; | |
4637 | xfree (arg); | |
4638 | } | |
4639 | ||
4640 | /* Save the value of inferior_ptid so that it may be restored by a | |
4641 | later call to do_cleanups(). Returns the struct cleanup pointer | |
4642 | needed for later doing the cleanup. */ | |
4643 | ||
4644 | struct cleanup * | |
4645 | save_inferior_ptid (void) | |
4646 | { | |
4647 | ptid_t *saved_ptid_ptr; | |
4648 | ||
4649 | saved_ptid_ptr = xmalloc (sizeof (ptid_t)); | |
4650 | *saved_ptid_ptr = inferior_ptid; | |
4651 | return make_cleanup (restore_inferior_ptid, saved_ptid_ptr); | |
4652 | } | |
c5aa993b | 4653 | \f |
488f131b | 4654 | |
ad52ddc6 PA |
4655 | int non_stop = 0; |
4656 | static int non_stop_1 = 0; | |
4657 | ||
4658 | static void | |
4659 | set_non_stop (char *args, int from_tty, | |
4660 | struct cmd_list_element *c) | |
4661 | { | |
4662 | if (target_has_execution) | |
4663 | { | |
4664 | non_stop_1 = non_stop; | |
4665 | error (_("Cannot change this setting while the inferior is running.")); | |
4666 | } | |
4667 | ||
4668 | non_stop = non_stop_1; | |
4669 | } | |
4670 | ||
4671 | static void | |
4672 | show_non_stop (struct ui_file *file, int from_tty, | |
4673 | struct cmd_list_element *c, const char *value) | |
4674 | { | |
4675 | fprintf_filtered (file, | |
4676 | _("Controlling the inferior in non-stop mode is %s.\n"), | |
4677 | value); | |
4678 | } | |
4679 | ||
4680 | ||
c906108c | 4681 | void |
96baa820 | 4682 | _initialize_infrun (void) |
c906108c | 4683 | { |
52f0bd74 AC |
4684 | int i; |
4685 | int numsigs; | |
c906108c SS |
4686 | struct cmd_list_element *c; |
4687 | ||
1bedd215 AC |
4688 | add_info ("signals", signals_info, _("\ |
4689 | What debugger does when program gets various signals.\n\ | |
4690 | Specify a signal as argument to print info on that signal only.")); | |
c906108c SS |
4691 | add_info_alias ("handle", "signals", 0); |
4692 | ||
1bedd215 AC |
4693 | add_com ("handle", class_run, handle_command, _("\ |
4694 | Specify how to handle a signal.\n\ | |
c906108c SS |
4695 | Args are signals and actions to apply to those signals.\n\ |
4696 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
4697 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
4698 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
4699 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
4700 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
4701 | Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\ | |
c906108c SS |
4702 | \"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\ |
4703 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
4704 | Print means print a message if this signal happens.\n\ | |
4705 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
4706 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 4707 | Pass and Stop may be combined.")); |
c906108c SS |
4708 | if (xdb_commands) |
4709 | { | |
1bedd215 AC |
4710 | add_com ("lz", class_info, signals_info, _("\ |
4711 | What debugger does when program gets various signals.\n\ | |
4712 | Specify a signal as argument to print info on that signal only.")); | |
4713 | add_com ("z", class_run, xdb_handle_command, _("\ | |
4714 | Specify how to handle a signal.\n\ | |
c906108c SS |
4715 | Args are signals and actions to apply to those signals.\n\ |
4716 | Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\ | |
4717 | from 1-15 are allowed for compatibility with old versions of GDB.\n\ | |
4718 | Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\ | |
4719 | The special arg \"all\" is recognized to mean all signals except those\n\ | |
1bedd215 AC |
4720 | used by the debugger, typically SIGTRAP and SIGINT.\n\ |
4721 | Recognized actions include \"s\" (toggles between stop and nostop), \n\ | |
c906108c SS |
4722 | \"r\" (toggles between print and noprint), \"i\" (toggles between pass and \ |
4723 | nopass), \"Q\" (noprint)\n\ | |
4724 | Stop means reenter debugger if this signal happens (implies print).\n\ | |
4725 | Print means print a message if this signal happens.\n\ | |
4726 | Pass means let program see this signal; otherwise program doesn't know.\n\ | |
4727 | Ignore is a synonym for nopass and noignore is a synonym for pass.\n\ | |
1bedd215 | 4728 | Pass and Stop may be combined.")); |
c906108c SS |
4729 | } |
4730 | ||
4731 | if (!dbx_commands) | |
1a966eab AC |
4732 | stop_command = add_cmd ("stop", class_obscure, |
4733 | not_just_help_class_command, _("\ | |
4734 | There is no `stop' command, but you can set a hook on `stop'.\n\ | |
c906108c | 4735 | This allows you to set a list of commands to be run each time execution\n\ |
1a966eab | 4736 | of the program stops."), &cmdlist); |
c906108c | 4737 | |
85c07804 AC |
4738 | add_setshow_zinteger_cmd ("infrun", class_maintenance, &debug_infrun, _("\ |
4739 | Set inferior debugging."), _("\ | |
4740 | Show inferior debugging."), _("\ | |
4741 | When non-zero, inferior specific debugging is enabled."), | |
4742 | NULL, | |
920d2a44 | 4743 | show_debug_infrun, |
85c07804 | 4744 | &setdebuglist, &showdebuglist); |
527159b7 | 4745 | |
237fc4c9 PA |
4746 | add_setshow_boolean_cmd ("displaced", class_maintenance, &debug_displaced, _("\ |
4747 | Set displaced stepping debugging."), _("\ | |
4748 | Show displaced stepping debugging."), _("\ | |
4749 | When non-zero, displaced stepping specific debugging is enabled."), | |
4750 | NULL, | |
4751 | show_debug_displaced, | |
4752 | &setdebuglist, &showdebuglist); | |
4753 | ||
ad52ddc6 PA |
4754 | add_setshow_boolean_cmd ("non-stop", no_class, |
4755 | &non_stop_1, _("\ | |
4756 | Set whether gdb controls the inferior in non-stop mode."), _("\ | |
4757 | Show whether gdb controls the inferior in non-stop mode."), _("\ | |
4758 | When debugging a multi-threaded program and this setting is\n\ | |
4759 | off (the default, also called all-stop mode), when one thread stops\n\ | |
4760 | (for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\ | |
4761 | all other threads in the program while you interact with the thread of\n\ | |
4762 | interest. When you continue or step a thread, you can allow the other\n\ | |
4763 | threads to run, or have them remain stopped, but while you inspect any\n\ | |
4764 | thread's state, all threads stop.\n\ | |
4765 | \n\ | |
4766 | In non-stop mode, when one thread stops, other threads can continue\n\ | |
4767 | to run freely. You'll be able to step each thread independently,\n\ | |
4768 | leave it stopped or free to run as needed."), | |
4769 | set_non_stop, | |
4770 | show_non_stop, | |
4771 | &setlist, | |
4772 | &showlist); | |
4773 | ||
c906108c | 4774 | numsigs = (int) TARGET_SIGNAL_LAST; |
488f131b | 4775 | signal_stop = (unsigned char *) xmalloc (sizeof (signal_stop[0]) * numsigs); |
c906108c SS |
4776 | signal_print = (unsigned char *) |
4777 | xmalloc (sizeof (signal_print[0]) * numsigs); | |
4778 | signal_program = (unsigned char *) | |
4779 | xmalloc (sizeof (signal_program[0]) * numsigs); | |
4780 | for (i = 0; i < numsigs; i++) | |
4781 | { | |
4782 | signal_stop[i] = 1; | |
4783 | signal_print[i] = 1; | |
4784 | signal_program[i] = 1; | |
4785 | } | |
4786 | ||
4787 | /* Signals caused by debugger's own actions | |
4788 | should not be given to the program afterwards. */ | |
4789 | signal_program[TARGET_SIGNAL_TRAP] = 0; | |
4790 | signal_program[TARGET_SIGNAL_INT] = 0; | |
4791 | ||
4792 | /* Signals that are not errors should not normally enter the debugger. */ | |
4793 | signal_stop[TARGET_SIGNAL_ALRM] = 0; | |
4794 | signal_print[TARGET_SIGNAL_ALRM] = 0; | |
4795 | signal_stop[TARGET_SIGNAL_VTALRM] = 0; | |
4796 | signal_print[TARGET_SIGNAL_VTALRM] = 0; | |
4797 | signal_stop[TARGET_SIGNAL_PROF] = 0; | |
4798 | signal_print[TARGET_SIGNAL_PROF] = 0; | |
4799 | signal_stop[TARGET_SIGNAL_CHLD] = 0; | |
4800 | signal_print[TARGET_SIGNAL_CHLD] = 0; | |
4801 | signal_stop[TARGET_SIGNAL_IO] = 0; | |
4802 | signal_print[TARGET_SIGNAL_IO] = 0; | |
4803 | signal_stop[TARGET_SIGNAL_POLL] = 0; | |
4804 | signal_print[TARGET_SIGNAL_POLL] = 0; | |
4805 | signal_stop[TARGET_SIGNAL_URG] = 0; | |
4806 | signal_print[TARGET_SIGNAL_URG] = 0; | |
4807 | signal_stop[TARGET_SIGNAL_WINCH] = 0; | |
4808 | signal_print[TARGET_SIGNAL_WINCH] = 0; | |
4809 | ||
cd0fc7c3 SS |
4810 | /* These signals are used internally by user-level thread |
4811 | implementations. (See signal(5) on Solaris.) Like the above | |
4812 | signals, a healthy program receives and handles them as part of | |
4813 | its normal operation. */ | |
4814 | signal_stop[TARGET_SIGNAL_LWP] = 0; | |
4815 | signal_print[TARGET_SIGNAL_LWP] = 0; | |
4816 | signal_stop[TARGET_SIGNAL_WAITING] = 0; | |
4817 | signal_print[TARGET_SIGNAL_WAITING] = 0; | |
4818 | signal_stop[TARGET_SIGNAL_CANCEL] = 0; | |
4819 | signal_print[TARGET_SIGNAL_CANCEL] = 0; | |
4820 | ||
85c07804 AC |
4821 | add_setshow_zinteger_cmd ("stop-on-solib-events", class_support, |
4822 | &stop_on_solib_events, _("\ | |
4823 | Set stopping for shared library events."), _("\ | |
4824 | Show stopping for shared library events."), _("\ | |
c906108c SS |
4825 | If nonzero, gdb will give control to the user when the dynamic linker\n\ |
4826 | notifies gdb of shared library events. The most common event of interest\n\ | |
85c07804 AC |
4827 | to the user would be loading/unloading of a new library."), |
4828 | NULL, | |
920d2a44 | 4829 | show_stop_on_solib_events, |
85c07804 | 4830 | &setlist, &showlist); |
c906108c | 4831 | |
7ab04401 AC |
4832 | add_setshow_enum_cmd ("follow-fork-mode", class_run, |
4833 | follow_fork_mode_kind_names, | |
4834 | &follow_fork_mode_string, _("\ | |
4835 | Set debugger response to a program call of fork or vfork."), _("\ | |
4836 | Show debugger response to a program call of fork or vfork."), _("\ | |
c906108c SS |
4837 | A fork or vfork creates a new process. follow-fork-mode can be:\n\ |
4838 | parent - the original process is debugged after a fork\n\ | |
4839 | child - the new process is debugged after a fork\n\ | |
ea1dd7bc | 4840 | The unfollowed process will continue to run.\n\ |
7ab04401 AC |
4841 | By default, the debugger will follow the parent process."), |
4842 | NULL, | |
920d2a44 | 4843 | show_follow_fork_mode_string, |
7ab04401 AC |
4844 | &setlist, &showlist); |
4845 | ||
4846 | add_setshow_enum_cmd ("scheduler-locking", class_run, | |
4847 | scheduler_enums, &scheduler_mode, _("\ | |
4848 | Set mode for locking scheduler during execution."), _("\ | |
4849 | Show mode for locking scheduler during execution."), _("\ | |
c906108c SS |
4850 | off == no locking (threads may preempt at any time)\n\ |
4851 | on == full locking (no thread except the current thread may run)\n\ | |
4852 | step == scheduler locked during every single-step operation.\n\ | |
4853 | In this mode, no other thread may run during a step command.\n\ | |
7ab04401 AC |
4854 | Other threads may run while stepping over a function call ('next')."), |
4855 | set_schedlock_func, /* traps on target vector */ | |
920d2a44 | 4856 | show_scheduler_mode, |
7ab04401 | 4857 | &setlist, &showlist); |
5fbbeb29 | 4858 | |
5bf193a2 AC |
4859 | add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\ |
4860 | Set mode of the step operation."), _("\ | |
4861 | Show mode of the step operation."), _("\ | |
4862 | When set, doing a step over a function without debug line information\n\ | |
4863 | will stop at the first instruction of that function. Otherwise, the\n\ | |
4864 | function is skipped and the step command stops at a different source line."), | |
4865 | NULL, | |
920d2a44 | 4866 | show_step_stop_if_no_debug, |
5bf193a2 | 4867 | &setlist, &showlist); |
ca6724c1 | 4868 | |
237fc4c9 | 4869 | add_setshow_boolean_cmd ("can-use-displaced-stepping", class_maintenance, |
1f41b062 | 4870 | &can_use_displaced_stepping, _("\ |
237fc4c9 PA |
4871 | Set debugger's willingness to use displaced stepping."), _("\ |
4872 | Show debugger's willingness to use displaced stepping."), _("\ | |
1f41b062 | 4873 | If zero, gdb will not use displaced stepping to step over\n\ |
237fc4c9 | 4874 | breakpoints, even if such is supported by the target."), |
1f41b062 MS |
4875 | NULL, |
4876 | show_can_use_displaced_stepping, | |
4877 | &maintenance_set_cmdlist, | |
237fc4c9 PA |
4878 | &maintenance_show_cmdlist); |
4879 | ||
ca6724c1 KB |
4880 | /* ptid initializations */ |
4881 | null_ptid = ptid_build (0, 0, 0); | |
4882 | minus_one_ptid = ptid_build (-1, 0, 0); | |
4883 | inferior_ptid = null_ptid; | |
4884 | target_last_wait_ptid = minus_one_ptid; | |
237fc4c9 | 4885 | displaced_step_ptid = null_ptid; |
5231c1fd PA |
4886 | |
4887 | observer_attach_thread_ptid_changed (infrun_thread_ptid_changed); | |
c906108c | 4888 | } |