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3993f6b1 | 1 | /* GNU/Linux native-dependent code common to multiple platforms. |
dba24537 | 2 | |
0fb0cc75 | 3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
e26af52f | 4 | Free Software Foundation, Inc. |
3993f6b1 DJ |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
3993f6b1 DJ |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
3993f6b1 DJ |
20 | |
21 | #include "defs.h" | |
22 | #include "inferior.h" | |
23 | #include "target.h" | |
d6b0e80f | 24 | #include "gdb_string.h" |
3993f6b1 | 25 | #include "gdb_wait.h" |
d6b0e80f AC |
26 | #include "gdb_assert.h" |
27 | #ifdef HAVE_TKILL_SYSCALL | |
28 | #include <unistd.h> | |
29 | #include <sys/syscall.h> | |
30 | #endif | |
3993f6b1 | 31 | #include <sys/ptrace.h> |
0274a8ce | 32 | #include "linux-nat.h" |
ac264b3b | 33 | #include "linux-fork.h" |
d6b0e80f AC |
34 | #include "gdbthread.h" |
35 | #include "gdbcmd.h" | |
36 | #include "regcache.h" | |
4f844a66 | 37 | #include "regset.h" |
10d6c8cd DJ |
38 | #include "inf-ptrace.h" |
39 | #include "auxv.h" | |
dba24537 AC |
40 | #include <sys/param.h> /* for MAXPATHLEN */ |
41 | #include <sys/procfs.h> /* for elf_gregset etc. */ | |
42 | #include "elf-bfd.h" /* for elfcore_write_* */ | |
43 | #include "gregset.h" /* for gregset */ | |
44 | #include "gdbcore.h" /* for get_exec_file */ | |
45 | #include <ctype.h> /* for isdigit */ | |
46 | #include "gdbthread.h" /* for struct thread_info etc. */ | |
47 | #include "gdb_stat.h" /* for struct stat */ | |
48 | #include <fcntl.h> /* for O_RDONLY */ | |
b84876c2 PA |
49 | #include "inf-loop.h" |
50 | #include "event-loop.h" | |
51 | #include "event-top.h" | |
07e059b5 VP |
52 | #include <pwd.h> |
53 | #include <sys/types.h> | |
54 | #include "gdb_dirent.h" | |
55 | #include "xml-support.h" | |
dba24537 | 56 | |
10568435 JK |
57 | #ifdef HAVE_PERSONALITY |
58 | # include <sys/personality.h> | |
59 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
60 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
61 | # endif | |
62 | #endif /* HAVE_PERSONALITY */ | |
63 | ||
8a77dff3 VP |
64 | /* This comment documents high-level logic of this file. |
65 | ||
66 | Waiting for events in sync mode | |
67 | =============================== | |
68 | ||
69 | When waiting for an event in a specific thread, we just use waitpid, passing | |
70 | the specific pid, and not passing WNOHANG. | |
71 | ||
72 | When waiting for an event in all threads, waitpid is not quite good. Prior to | |
73 | version 2.4, Linux can either wait for event in main thread, or in secondary | |
74 | threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might | |
75 | miss an event. The solution is to use non-blocking waitpid, together with | |
76 | sigsuspend. First, we use non-blocking waitpid to get an event in the main | |
77 | process, if any. Second, we use non-blocking waitpid with the __WCLONED | |
78 | flag to check for events in cloned processes. If nothing is found, we use | |
79 | sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something | |
80 | happened to a child process -- and SIGCHLD will be delivered both for events | |
81 | in main debugged process and in cloned processes. As soon as we know there's | |
82 | an event, we get back to calling nonblocking waitpid with and without __WCLONED. | |
83 | ||
84 | Note that SIGCHLD should be blocked between waitpid and sigsuspend calls, | |
85 | so that we don't miss a signal. If SIGCHLD arrives in between, when it's | |
86 | blocked, the signal becomes pending and sigsuspend immediately | |
87 | notices it and returns. | |
88 | ||
89 | Waiting for events in async mode | |
90 | ================================ | |
91 | ||
92 | In async mode, GDB should always be ready to handle both user input and target | |
93 | events, so neither blocking waitpid nor sigsuspend are viable | |
94 | options. Instead, we should notify the GDB main event loop whenever there's | |
95 | unprocessed event from the target. The only way to notify this event loop is | |
96 | to make it wait on input from a pipe, and write something to the pipe whenever | |
97 | there's event. Obviously, if we fail to notify the event loop if there's | |
98 | target event, it's bad. If we notify the event loop when there's no event | |
99 | from target, linux-nat.c will detect that there's no event, actually, and | |
100 | report event of type TARGET_WAITKIND_IGNORE, but it will waste time and | |
101 | better avoided. | |
102 | ||
103 | The main design point is that every time GDB is outside linux-nat.c, we have a | |
104 | SIGCHLD handler installed that is called when something happens to the target | |
105 | and notifies the GDB event loop. Also, the event is extracted from the target | |
106 | using waitpid and stored for future use. Whenever GDB core decides to handle | |
107 | the event, and calls into linux-nat.c, we disable SIGCHLD and process things | |
108 | as in sync mode, except that before waitpid call we check if there are any | |
109 | previously read events. | |
110 | ||
111 | It could happen that during event processing, we'll try to get more events | |
112 | than there are events in the local queue, which will result to waitpid call. | |
113 | Those waitpid calls, while blocking, are guarantied to always have | |
114 | something for waitpid to return. E.g., stopping a thread with SIGSTOP, and | |
115 | waiting for the lwp to stop. | |
116 | ||
117 | The event loop is notified about new events using a pipe. SIGCHLD handler does | |
118 | waitpid and writes the results in to a pipe. GDB event loop has the other end | |
119 | of the pipe among the sources. When event loop starts to process the event | |
120 | and calls a function in linux-nat.c, all events from the pipe are transferred | |
121 | into a local queue and SIGCHLD is blocked. Further processing goes as in sync | |
122 | mode. Before we return from linux_nat_wait, we transfer all unprocessed events | |
123 | from local queue back to the pipe, so that when we get back to event loop, | |
124 | event loop will notice there's something more to do. | |
125 | ||
126 | SIGCHLD is blocked when we're inside target_wait, so that should we actually | |
127 | want to wait for some more events, SIGCHLD handler does not steal them from | |
128 | us. Technically, it would be possible to add new events to the local queue but | |
129 | it's about the same amount of work as blocking SIGCHLD. | |
130 | ||
131 | This moving of events from pipe into local queue and back into pipe when we | |
132 | enter/leave linux-nat.c is somewhat ugly. Unfortunately, GDB event loop is | |
133 | home-grown and incapable to wait on any queue. | |
134 | ||
135 | Use of signals | |
136 | ============== | |
137 | ||
138 | We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another | |
139 | signal is not entirely significant; we just need for a signal to be delivered, | |
140 | so that we can intercept it. SIGSTOP's advantage is that it can not be | |
141 | blocked. A disadvantage is that it is not a real-time signal, so it can only | |
142 | be queued once; we do not keep track of other sources of SIGSTOP. | |
143 | ||
144 | Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't | |
145 | use them, because they have special behavior when the signal is generated - | |
146 | not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL | |
147 | kills the entire thread group. | |
148 | ||
149 | A delivered SIGSTOP would stop the entire thread group, not just the thread we | |
150 | tkill'd. But we never let the SIGSTOP be delivered; we always intercept and | |
151 | cancel it (by PTRACE_CONT without passing SIGSTOP). | |
152 | ||
153 | We could use a real-time signal instead. This would solve those problems; we | |
154 | could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB. | |
155 | But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH | |
156 | generates it, and there are races with trying to find a signal that is not | |
157 | blocked. */ | |
a0ef4274 | 158 | |
dba24537 AC |
159 | #ifndef O_LARGEFILE |
160 | #define O_LARGEFILE 0 | |
161 | #endif | |
0274a8ce | 162 | |
3993f6b1 DJ |
163 | /* If the system headers did not provide the constants, hard-code the normal |
164 | values. */ | |
165 | #ifndef PTRACE_EVENT_FORK | |
166 | ||
167 | #define PTRACE_SETOPTIONS 0x4200 | |
168 | #define PTRACE_GETEVENTMSG 0x4201 | |
169 | ||
170 | /* options set using PTRACE_SETOPTIONS */ | |
171 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
172 | #define PTRACE_O_TRACEFORK 0x00000002 | |
173 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
174 | #define PTRACE_O_TRACECLONE 0x00000008 | |
175 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
9016a515 DJ |
176 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 |
177 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
3993f6b1 DJ |
178 | |
179 | /* Wait extended result codes for the above trace options. */ | |
180 | #define PTRACE_EVENT_FORK 1 | |
181 | #define PTRACE_EVENT_VFORK 2 | |
182 | #define PTRACE_EVENT_CLONE 3 | |
183 | #define PTRACE_EVENT_EXEC 4 | |
c874c7fc | 184 | #define PTRACE_EVENT_VFORK_DONE 5 |
9016a515 | 185 | #define PTRACE_EVENT_EXIT 6 |
3993f6b1 DJ |
186 | |
187 | #endif /* PTRACE_EVENT_FORK */ | |
188 | ||
189 | /* We can't always assume that this flag is available, but all systems | |
190 | with the ptrace event handlers also have __WALL, so it's safe to use | |
191 | here. */ | |
192 | #ifndef __WALL | |
193 | #define __WALL 0x40000000 /* Wait for any child. */ | |
194 | #endif | |
195 | ||
02d3ff8c | 196 | #ifndef PTRACE_GETSIGINFO |
1ef18d08 PA |
197 | # define PTRACE_GETSIGINFO 0x4202 |
198 | # define PTRACE_SETSIGINFO 0x4203 | |
02d3ff8c UW |
199 | #endif |
200 | ||
10d6c8cd DJ |
201 | /* The single-threaded native GNU/Linux target_ops. We save a pointer for |
202 | the use of the multi-threaded target. */ | |
203 | static struct target_ops *linux_ops; | |
f973ed9c | 204 | static struct target_ops linux_ops_saved; |
10d6c8cd | 205 | |
9f0bdab8 DJ |
206 | /* The method to call, if any, when a new thread is attached. */ |
207 | static void (*linux_nat_new_thread) (ptid_t); | |
208 | ||
5b009018 PA |
209 | /* The method to call, if any, when the siginfo object needs to be |
210 | converted between the layout returned by ptrace, and the layout in | |
211 | the architecture of the inferior. */ | |
212 | static int (*linux_nat_siginfo_fixup) (struct siginfo *, | |
213 | gdb_byte *, | |
214 | int); | |
215 | ||
ac264b3b MS |
216 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
217 | Called by our to_xfer_partial. */ | |
218 | static LONGEST (*super_xfer_partial) (struct target_ops *, | |
219 | enum target_object, | |
220 | const char *, gdb_byte *, | |
221 | const gdb_byte *, | |
10d6c8cd DJ |
222 | ULONGEST, LONGEST); |
223 | ||
d6b0e80f | 224 | static int debug_linux_nat; |
920d2a44 AC |
225 | static void |
226 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
227 | struct cmd_list_element *c, const char *value) | |
228 | { | |
229 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
230 | value); | |
231 | } | |
d6b0e80f | 232 | |
b84876c2 PA |
233 | static int debug_linux_nat_async = 0; |
234 | static void | |
235 | show_debug_linux_nat_async (struct ui_file *file, int from_tty, | |
236 | struct cmd_list_element *c, const char *value) | |
237 | { | |
238 | fprintf_filtered (file, _("Debugging of GNU/Linux async lwp module is %s.\n"), | |
239 | value); | |
240 | } | |
241 | ||
10568435 JK |
242 | static int disable_randomization = 1; |
243 | ||
244 | static void | |
245 | show_disable_randomization (struct ui_file *file, int from_tty, | |
246 | struct cmd_list_element *c, const char *value) | |
247 | { | |
248 | #ifdef HAVE_PERSONALITY | |
249 | fprintf_filtered (file, _("\ | |
250 | Disabling randomization of debuggee's virtual address space is %s.\n"), | |
251 | value); | |
252 | #else /* !HAVE_PERSONALITY */ | |
253 | fputs_filtered (_("\ | |
254 | Disabling randomization of debuggee's virtual address space is unsupported on\n\ | |
255 | this platform.\n"), file); | |
256 | #endif /* !HAVE_PERSONALITY */ | |
257 | } | |
258 | ||
259 | static void | |
260 | set_disable_randomization (char *args, int from_tty, struct cmd_list_element *c) | |
261 | { | |
262 | #ifndef HAVE_PERSONALITY | |
263 | error (_("\ | |
264 | Disabling randomization of debuggee's virtual address space is unsupported on\n\ | |
265 | this platform.")); | |
266 | #endif /* !HAVE_PERSONALITY */ | |
267 | } | |
268 | ||
9016a515 DJ |
269 | static int linux_parent_pid; |
270 | ||
ae087d01 DJ |
271 | struct simple_pid_list |
272 | { | |
273 | int pid; | |
3d799a95 | 274 | int status; |
ae087d01 DJ |
275 | struct simple_pid_list *next; |
276 | }; | |
277 | struct simple_pid_list *stopped_pids; | |
278 | ||
3993f6b1 DJ |
279 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
280 | can not be used, 1 if it can. */ | |
281 | ||
282 | static int linux_supports_tracefork_flag = -1; | |
283 | ||
9016a515 DJ |
284 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
285 | PTRACE_O_TRACEVFORKDONE. */ | |
286 | ||
287 | static int linux_supports_tracevforkdone_flag = -1; | |
288 | ||
b84876c2 PA |
289 | /* Async mode support */ |
290 | ||
b84876c2 PA |
291 | /* Zero if the async mode, although enabled, is masked, which means |
292 | linux_nat_wait should behave as if async mode was off. */ | |
293 | static int linux_nat_async_mask_value = 1; | |
294 | ||
295 | /* The read/write ends of the pipe registered as waitable file in the | |
296 | event loop. */ | |
297 | static int linux_nat_event_pipe[2] = { -1, -1 }; | |
298 | ||
299 | /* Number of queued events in the pipe. */ | |
300 | static volatile int linux_nat_num_queued_events; | |
301 | ||
84e46146 | 302 | /* The possible SIGCHLD handling states. */ |
b84876c2 | 303 | |
84e46146 PA |
304 | enum sigchld_state |
305 | { | |
306 | /* SIGCHLD disabled, with action set to sigchld_handler, for the | |
307 | sigsuspend in linux_nat_wait. */ | |
308 | sigchld_sync, | |
309 | /* SIGCHLD enabled, with action set to async_sigchld_handler. */ | |
310 | sigchld_async, | |
311 | /* Set SIGCHLD to default action. Used while creating an | |
312 | inferior. */ | |
313 | sigchld_default | |
314 | }; | |
315 | ||
316 | /* The current SIGCHLD handling state. */ | |
317 | static enum sigchld_state linux_nat_async_events_state; | |
318 | ||
319 | static enum sigchld_state linux_nat_async_events (enum sigchld_state enable); | |
b84876c2 PA |
320 | static void pipe_to_local_event_queue (void); |
321 | static void local_event_queue_to_pipe (void); | |
322 | static void linux_nat_event_pipe_push (int pid, int status, int options); | |
323 | static int linux_nat_event_pipe_pop (int* ptr_status, int* ptr_options); | |
324 | static void linux_nat_set_async_mode (int on); | |
325 | static void linux_nat_async (void (*callback) | |
326 | (enum inferior_event_type event_type, void *context), | |
327 | void *context); | |
328 | static int linux_nat_async_mask (int mask); | |
a0ef4274 | 329 | static int kill_lwp (int lwpid, int signo); |
b84876c2 | 330 | |
4c28f408 PA |
331 | static int stop_callback (struct lwp_info *lp, void *data); |
332 | ||
b84876c2 PA |
333 | /* Captures the result of a successful waitpid call, along with the |
334 | options used in that call. */ | |
335 | struct waitpid_result | |
336 | { | |
337 | int pid; | |
338 | int status; | |
339 | int options; | |
340 | struct waitpid_result *next; | |
341 | }; | |
342 | ||
343 | /* A singly-linked list of the results of the waitpid calls performed | |
344 | in the async SIGCHLD handler. */ | |
345 | static struct waitpid_result *waitpid_queue = NULL; | |
346 | ||
252fbfc8 PA |
347 | /* Similarly to `waitpid', but check the local event queue instead of |
348 | querying the kernel queue. If PEEK, don't remove the event found | |
349 | from the queue. */ | |
350 | ||
b84876c2 | 351 | static int |
252fbfc8 | 352 | queued_waitpid_1 (int pid, int *status, int flags, int peek) |
b84876c2 PA |
353 | { |
354 | struct waitpid_result *msg = waitpid_queue, *prev = NULL; | |
355 | ||
356 | if (debug_linux_nat_async) | |
357 | fprintf_unfiltered (gdb_stdlog, | |
358 | "\ | |
84e46146 PA |
359 | QWPID: linux_nat_async_events_state(%d), linux_nat_num_queued_events(%d)\n", |
360 | linux_nat_async_events_state, | |
b84876c2 PA |
361 | linux_nat_num_queued_events); |
362 | ||
363 | if (flags & __WALL) | |
364 | { | |
365 | for (; msg; prev = msg, msg = msg->next) | |
366 | if (pid == -1 || pid == msg->pid) | |
367 | break; | |
368 | } | |
369 | else if (flags & __WCLONE) | |
370 | { | |
371 | for (; msg; prev = msg, msg = msg->next) | |
372 | if (msg->options & __WCLONE | |
373 | && (pid == -1 || pid == msg->pid)) | |
374 | break; | |
375 | } | |
376 | else | |
377 | { | |
378 | for (; msg; prev = msg, msg = msg->next) | |
379 | if ((msg->options & __WCLONE) == 0 | |
380 | && (pid == -1 || pid == msg->pid)) | |
381 | break; | |
382 | } | |
383 | ||
384 | if (msg) | |
385 | { | |
386 | int pid; | |
387 | ||
b84876c2 PA |
388 | if (status) |
389 | *status = msg->status; | |
390 | pid = msg->pid; | |
391 | ||
392 | if (debug_linux_nat_async) | |
393 | fprintf_unfiltered (gdb_stdlog, "QWPID: pid(%d), status(%x)\n", | |
394 | pid, msg->status); | |
252fbfc8 PA |
395 | |
396 | if (!peek) | |
397 | { | |
398 | if (prev) | |
399 | prev->next = msg->next; | |
400 | else | |
401 | waitpid_queue = msg->next; | |
402 | ||
403 | msg->next = NULL; | |
404 | xfree (msg); | |
405 | } | |
b84876c2 PA |
406 | |
407 | return pid; | |
408 | } | |
409 | ||
410 | if (debug_linux_nat_async) | |
411 | fprintf_unfiltered (gdb_stdlog, "QWPID: miss\n"); | |
412 | ||
413 | if (status) | |
414 | *status = 0; | |
415 | return -1; | |
416 | } | |
417 | ||
252fbfc8 PA |
418 | /* Similarly to `waitpid', but check the local event queue. */ |
419 | ||
420 | static int | |
421 | queued_waitpid (int pid, int *status, int flags) | |
422 | { | |
423 | return queued_waitpid_1 (pid, status, flags, 0); | |
424 | } | |
425 | ||
b84876c2 PA |
426 | static void |
427 | push_waitpid (int pid, int status, int options) | |
428 | { | |
429 | struct waitpid_result *event, *new_event; | |
430 | ||
431 | new_event = xmalloc (sizeof (*new_event)); | |
432 | new_event->pid = pid; | |
433 | new_event->status = status; | |
434 | new_event->options = options; | |
435 | new_event->next = NULL; | |
436 | ||
437 | if (waitpid_queue) | |
438 | { | |
439 | for (event = waitpid_queue; | |
440 | event && event->next; | |
441 | event = event->next) | |
442 | ; | |
443 | ||
444 | event->next = new_event; | |
445 | } | |
446 | else | |
447 | waitpid_queue = new_event; | |
448 | } | |
449 | ||
710151dd | 450 | /* Drain all queued events of PID. If PID is -1, the effect is of |
b84876c2 PA |
451 | draining all events. */ |
452 | static void | |
453 | drain_queued_events (int pid) | |
454 | { | |
455 | while (queued_waitpid (pid, NULL, __WALL) != -1) | |
456 | ; | |
457 | } | |
458 | ||
ae087d01 DJ |
459 | \f |
460 | /* Trivial list manipulation functions to keep track of a list of | |
461 | new stopped processes. */ | |
462 | static void | |
3d799a95 | 463 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) |
ae087d01 DJ |
464 | { |
465 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
466 | new_pid->pid = pid; | |
3d799a95 | 467 | new_pid->status = status; |
ae087d01 DJ |
468 | new_pid->next = *listp; |
469 | *listp = new_pid; | |
470 | } | |
471 | ||
472 | static int | |
3d799a95 | 473 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *status) |
ae087d01 DJ |
474 | { |
475 | struct simple_pid_list **p; | |
476 | ||
477 | for (p = listp; *p != NULL; p = &(*p)->next) | |
478 | if ((*p)->pid == pid) | |
479 | { | |
480 | struct simple_pid_list *next = (*p)->next; | |
3d799a95 | 481 | *status = (*p)->status; |
ae087d01 DJ |
482 | xfree (*p); |
483 | *p = next; | |
484 | return 1; | |
485 | } | |
486 | return 0; | |
487 | } | |
488 | ||
3d799a95 DJ |
489 | static void |
490 | linux_record_stopped_pid (int pid, int status) | |
ae087d01 | 491 | { |
3d799a95 | 492 | add_to_pid_list (&stopped_pids, pid, status); |
ae087d01 DJ |
493 | } |
494 | ||
3993f6b1 DJ |
495 | \f |
496 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
497 | ||
498 | static void | |
499 | linux_tracefork_child (void) | |
500 | { | |
501 | int ret; | |
502 | ||
503 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
504 | kill (getpid (), SIGSTOP); | |
505 | fork (); | |
48bb3cce | 506 | _exit (0); |
3993f6b1 DJ |
507 | } |
508 | ||
b84876c2 PA |
509 | /* Wrapper function for waitpid which handles EINTR, and checks for |
510 | locally queued events. */ | |
b957e937 DJ |
511 | |
512 | static int | |
513 | my_waitpid (int pid, int *status, int flags) | |
514 | { | |
515 | int ret; | |
b84876c2 PA |
516 | |
517 | /* There should be no concurrent calls to waitpid. */ | |
84e46146 | 518 | gdb_assert (linux_nat_async_events_state == sigchld_sync); |
b84876c2 PA |
519 | |
520 | ret = queued_waitpid (pid, status, flags); | |
521 | if (ret != -1) | |
522 | return ret; | |
523 | ||
b957e937 DJ |
524 | do |
525 | { | |
526 | ret = waitpid (pid, status, flags); | |
527 | } | |
528 | while (ret == -1 && errno == EINTR); | |
529 | ||
530 | return ret; | |
531 | } | |
532 | ||
533 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
534 | ||
535 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
536 | we know that the feature is not available. This may change the tracing | |
537 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
538 | ||
539 | However, if it succeeds, we don't know for sure that the feature is | |
540 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 541 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
542 | fork tracing, and let it fork. If the process exits, we assume that we |
543 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
544 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
545 | |
546 | static void | |
b957e937 | 547 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
548 | { |
549 | int child_pid, ret, status; | |
550 | long second_pid; | |
4c28f408 PA |
551 | enum sigchld_state async_events_original_state; |
552 | ||
553 | async_events_original_state = linux_nat_async_events (sigchld_sync); | |
3993f6b1 | 554 | |
b957e937 DJ |
555 | linux_supports_tracefork_flag = 0; |
556 | linux_supports_tracevforkdone_flag = 0; | |
557 | ||
558 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
559 | if (ret != 0) | |
560 | return; | |
561 | ||
3993f6b1 DJ |
562 | child_pid = fork (); |
563 | if (child_pid == -1) | |
e2e0b3e5 | 564 | perror_with_name (("fork")); |
3993f6b1 DJ |
565 | |
566 | if (child_pid == 0) | |
567 | linux_tracefork_child (); | |
568 | ||
b957e937 | 569 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 570 | if (ret == -1) |
e2e0b3e5 | 571 | perror_with_name (("waitpid")); |
3993f6b1 | 572 | else if (ret != child_pid) |
8a3fe4f8 | 573 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 574 | if (! WIFSTOPPED (status)) |
8a3fe4f8 | 575 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status); |
3993f6b1 | 576 | |
3993f6b1 DJ |
577 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
578 | if (ret != 0) | |
579 | { | |
b957e937 DJ |
580 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
581 | if (ret != 0) | |
582 | { | |
8a3fe4f8 | 583 | warning (_("linux_test_for_tracefork: failed to kill child")); |
4c28f408 | 584 | linux_nat_async_events (async_events_original_state); |
b957e937 DJ |
585 | return; |
586 | } | |
587 | ||
588 | ret = my_waitpid (child_pid, &status, 0); | |
589 | if (ret != child_pid) | |
8a3fe4f8 | 590 | warning (_("linux_test_for_tracefork: failed to wait for killed child")); |
b957e937 | 591 | else if (!WIFSIGNALED (status)) |
8a3fe4f8 AC |
592 | warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from " |
593 | "killed child"), status); | |
b957e937 | 594 | |
4c28f408 | 595 | linux_nat_async_events (async_events_original_state); |
3993f6b1 DJ |
596 | return; |
597 | } | |
598 | ||
9016a515 DJ |
599 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
600 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
601 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
602 | linux_supports_tracevforkdone_flag = (ret == 0); | |
603 | ||
b957e937 DJ |
604 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
605 | if (ret != 0) | |
8a3fe4f8 | 606 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
607 | |
608 | ret = my_waitpid (child_pid, &status, 0); | |
609 | ||
3993f6b1 DJ |
610 | if (ret == child_pid && WIFSTOPPED (status) |
611 | && status >> 16 == PTRACE_EVENT_FORK) | |
612 | { | |
613 | second_pid = 0; | |
614 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
615 | if (ret == 0 && second_pid != 0) | |
616 | { | |
617 | int second_status; | |
618 | ||
619 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
620 | my_waitpid (second_pid, &second_status, 0); |
621 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
622 | if (ret != 0) | |
8a3fe4f8 | 623 | warning (_("linux_test_for_tracefork: failed to kill second child")); |
97725dc4 | 624 | my_waitpid (second_pid, &status, 0); |
3993f6b1 DJ |
625 | } |
626 | } | |
b957e937 | 627 | else |
8a3fe4f8 AC |
628 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
629 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 630 | |
b957e937 DJ |
631 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
632 | if (ret != 0) | |
8a3fe4f8 | 633 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 634 | my_waitpid (child_pid, &status, 0); |
4c28f408 PA |
635 | |
636 | linux_nat_async_events (async_events_original_state); | |
3993f6b1 DJ |
637 | } |
638 | ||
639 | /* Return non-zero iff we have tracefork functionality available. | |
640 | This function also sets linux_supports_tracefork_flag. */ | |
641 | ||
642 | static int | |
b957e937 | 643 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
644 | { |
645 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 646 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
647 | return linux_supports_tracefork_flag; |
648 | } | |
649 | ||
9016a515 | 650 | static int |
b957e937 | 651 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
652 | { |
653 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 654 | linux_test_for_tracefork (pid); |
9016a515 DJ |
655 | return linux_supports_tracevforkdone_flag; |
656 | } | |
657 | ||
3993f6b1 | 658 | \f |
4de4c07c DJ |
659 | void |
660 | linux_enable_event_reporting (ptid_t ptid) | |
661 | { | |
d3587048 | 662 | int pid = ptid_get_lwp (ptid); |
4de4c07c DJ |
663 | int options; |
664 | ||
d3587048 DJ |
665 | if (pid == 0) |
666 | pid = ptid_get_pid (ptid); | |
667 | ||
b957e937 | 668 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
669 | return; |
670 | ||
a2f23071 DJ |
671 | options = PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACEEXEC |
672 | | PTRACE_O_TRACECLONE; | |
b957e937 | 673 | if (linux_supports_tracevforkdone (pid)) |
9016a515 DJ |
674 | options |= PTRACE_O_TRACEVFORKDONE; |
675 | ||
676 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
677 | read-only process state. */ | |
4de4c07c DJ |
678 | |
679 | ptrace (PTRACE_SETOPTIONS, pid, 0, options); | |
680 | } | |
681 | ||
6d8fd2b7 UW |
682 | static void |
683 | linux_child_post_attach (int pid) | |
4de4c07c DJ |
684 | { |
685 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
0ec9a092 | 686 | check_for_thread_db (); |
4de4c07c DJ |
687 | } |
688 | ||
10d6c8cd | 689 | static void |
4de4c07c DJ |
690 | linux_child_post_startup_inferior (ptid_t ptid) |
691 | { | |
692 | linux_enable_event_reporting (ptid); | |
0ec9a092 | 693 | check_for_thread_db (); |
4de4c07c DJ |
694 | } |
695 | ||
6d8fd2b7 UW |
696 | static int |
697 | linux_child_follow_fork (struct target_ops *ops, int follow_child) | |
3993f6b1 | 698 | { |
4de4c07c DJ |
699 | ptid_t last_ptid; |
700 | struct target_waitstatus last_status; | |
9016a515 | 701 | int has_vforked; |
4de4c07c DJ |
702 | int parent_pid, child_pid; |
703 | ||
b84876c2 PA |
704 | if (target_can_async_p ()) |
705 | target_async (NULL, 0); | |
706 | ||
4de4c07c | 707 | get_last_target_status (&last_ptid, &last_status); |
9016a515 | 708 | has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED); |
d3587048 DJ |
709 | parent_pid = ptid_get_lwp (last_ptid); |
710 | if (parent_pid == 0) | |
711 | parent_pid = ptid_get_pid (last_ptid); | |
3a3e9ee3 | 712 | child_pid = PIDGET (last_status.value.related_pid); |
4de4c07c DJ |
713 | |
714 | if (! follow_child) | |
715 | { | |
716 | /* We're already attached to the parent, by default. */ | |
717 | ||
718 | /* Before detaching from the child, remove all breakpoints from | |
719 | it. (This won't actually modify the breakpoint list, but will | |
720 | physically remove the breakpoints from the child.) */ | |
9016a515 DJ |
721 | /* If we vforked this will remove the breakpoints from the parent |
722 | also, but they'll be reinserted below. */ | |
4de4c07c DJ |
723 | detach_breakpoints (child_pid); |
724 | ||
ac264b3b MS |
725 | /* Detach new forked process? */ |
726 | if (detach_fork) | |
f75c00e4 | 727 | { |
e85a822c | 728 | if (info_verbose || debug_linux_nat) |
ac264b3b MS |
729 | { |
730 | target_terminal_ours (); | |
731 | fprintf_filtered (gdb_stdlog, | |
732 | "Detaching after fork from child process %d.\n", | |
733 | child_pid); | |
734 | } | |
4de4c07c | 735 | |
ac264b3b MS |
736 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
737 | } | |
738 | else | |
739 | { | |
740 | struct fork_info *fp; | |
77435e4c | 741 | struct inferior *parent_inf, *child_inf; |
7f9f62ba PA |
742 | |
743 | /* Add process to GDB's tables. */ | |
77435e4c PA |
744 | child_inf = add_inferior (child_pid); |
745 | ||
746 | parent_inf = find_inferior_pid (GET_PID (last_ptid)); | |
747 | child_inf->attach_flag = parent_inf->attach_flag; | |
7f9f62ba | 748 | |
ac264b3b MS |
749 | /* Retain child fork in ptrace (stopped) state. */ |
750 | fp = find_fork_pid (child_pid); | |
751 | if (!fp) | |
752 | fp = add_fork (child_pid); | |
753 | fork_save_infrun_state (fp, 0); | |
754 | } | |
9016a515 DJ |
755 | |
756 | if (has_vforked) | |
757 | { | |
b957e937 DJ |
758 | gdb_assert (linux_supports_tracefork_flag >= 0); |
759 | if (linux_supports_tracevforkdone (0)) | |
9016a515 DJ |
760 | { |
761 | int status; | |
762 | ||
763 | ptrace (PTRACE_CONT, parent_pid, 0, 0); | |
58aecb61 | 764 | my_waitpid (parent_pid, &status, __WALL); |
c874c7fc | 765 | if ((status >> 16) != PTRACE_EVENT_VFORK_DONE) |
8a3fe4f8 AC |
766 | warning (_("Unexpected waitpid result %06x when waiting for " |
767 | "vfork-done"), status); | |
9016a515 DJ |
768 | } |
769 | else | |
770 | { | |
771 | /* We can't insert breakpoints until the child has | |
772 | finished with the shared memory region. We need to | |
773 | wait until that happens. Ideal would be to just | |
774 | call: | |
775 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
776 | - waitpid (parent_pid, &status, __WALL); | |
777 | However, most architectures can't handle a syscall | |
778 | being traced on the way out if it wasn't traced on | |
779 | the way in. | |
780 | ||
781 | We might also think to loop, continuing the child | |
782 | until it exits or gets a SIGTRAP. One problem is | |
783 | that the child might call ptrace with PTRACE_TRACEME. | |
784 | ||
785 | There's no simple and reliable way to figure out when | |
786 | the vforked child will be done with its copy of the | |
787 | shared memory. We could step it out of the syscall, | |
788 | two instructions, let it go, and then single-step the | |
789 | parent once. When we have hardware single-step, this | |
790 | would work; with software single-step it could still | |
791 | be made to work but we'd have to be able to insert | |
792 | single-step breakpoints in the child, and we'd have | |
793 | to insert -just- the single-step breakpoint in the | |
794 | parent. Very awkward. | |
795 | ||
796 | In the end, the best we can do is to make sure it | |
797 | runs for a little while. Hopefully it will be out of | |
798 | range of any breakpoints we reinsert. Usually this | |
799 | is only the single-step breakpoint at vfork's return | |
800 | point. */ | |
801 | ||
802 | usleep (10000); | |
803 | } | |
804 | ||
805 | /* Since we vforked, breakpoints were removed in the parent | |
806 | too. Put them back. */ | |
807 | reattach_breakpoints (parent_pid); | |
808 | } | |
4de4c07c | 809 | } |
3993f6b1 | 810 | else |
4de4c07c | 811 | { |
4e1c45ea PA |
812 | struct thread_info *last_tp = find_thread_pid (last_ptid); |
813 | struct thread_info *tp; | |
4de4c07c | 814 | char child_pid_spelling[40]; |
77435e4c | 815 | struct inferior *parent_inf, *child_inf; |
4de4c07c | 816 | |
4e1c45ea PA |
817 | /* Copy user stepping state to the new inferior thread. */ |
818 | struct breakpoint *step_resume_breakpoint = last_tp->step_resume_breakpoint; | |
819 | CORE_ADDR step_range_start = last_tp->step_range_start; | |
820 | CORE_ADDR step_range_end = last_tp->step_range_end; | |
821 | struct frame_id step_frame_id = last_tp->step_frame_id; | |
822 | ||
823 | /* Otherwise, deleting the parent would get rid of this | |
824 | breakpoint. */ | |
825 | last_tp->step_resume_breakpoint = NULL; | |
826 | ||
4de4c07c | 827 | /* Needed to keep the breakpoint lists in sync. */ |
9016a515 DJ |
828 | if (! has_vforked) |
829 | detach_breakpoints (child_pid); | |
4de4c07c DJ |
830 | |
831 | /* Before detaching from the parent, remove all breakpoints from it. */ | |
832 | remove_breakpoints (); | |
833 | ||
e85a822c | 834 | if (info_verbose || debug_linux_nat) |
f75c00e4 DJ |
835 | { |
836 | target_terminal_ours (); | |
ac264b3b MS |
837 | fprintf_filtered (gdb_stdlog, |
838 | "Attaching after fork to child process %d.\n", | |
839 | child_pid); | |
f75c00e4 | 840 | } |
4de4c07c | 841 | |
7a7d3353 PA |
842 | /* Add the new inferior first, so that the target_detach below |
843 | doesn't unpush the target. */ | |
844 | ||
77435e4c PA |
845 | child_inf = add_inferior (child_pid); |
846 | ||
847 | parent_inf = find_inferior_pid (GET_PID (last_ptid)); | |
848 | child_inf->attach_flag = parent_inf->attach_flag; | |
7a7d3353 | 849 | |
9016a515 DJ |
850 | /* If we're vforking, we may want to hold on to the parent until |
851 | the child exits or execs. At exec time we can remove the old | |
852 | breakpoints from the parent and detach it; at exit time we | |
853 | could do the same (or even, sneakily, resume debugging it - the | |
854 | child's exec has failed, or something similar). | |
855 | ||
856 | This doesn't clean up "properly", because we can't call | |
857 | target_detach, but that's OK; if the current target is "child", | |
858 | then it doesn't need any further cleanups, and lin_lwp will | |
859 | generally not encounter vfork (vfork is defined to fork | |
860 | in libpthread.so). | |
861 | ||
862 | The holding part is very easy if we have VFORKDONE events; | |
863 | but keeping track of both processes is beyond GDB at the | |
864 | moment. So we don't expose the parent to the rest of GDB. | |
865 | Instead we quietly hold onto it until such time as we can | |
866 | safely resume it. */ | |
867 | ||
868 | if (has_vforked) | |
7f9f62ba PA |
869 | { |
870 | linux_parent_pid = parent_pid; | |
871 | detach_inferior (parent_pid); | |
872 | } | |
ac264b3b MS |
873 | else if (!detach_fork) |
874 | { | |
875 | struct fork_info *fp; | |
876 | /* Retain parent fork in ptrace (stopped) state. */ | |
877 | fp = find_fork_pid (parent_pid); | |
878 | if (!fp) | |
879 | fp = add_fork (parent_pid); | |
880 | fork_save_infrun_state (fp, 0); | |
0d14fc63 PA |
881 | |
882 | /* Also add an entry for the child fork. */ | |
883 | fp = find_fork_pid (child_pid); | |
884 | if (!fp) | |
885 | fp = add_fork (child_pid); | |
886 | fork_save_infrun_state (fp, 0); | |
ac264b3b | 887 | } |
9016a515 | 888 | else |
b84876c2 | 889 | target_detach (NULL, 0); |
4de4c07c | 890 | |
9f0bdab8 | 891 | inferior_ptid = ptid_build (child_pid, child_pid, 0); |
ac264b3b | 892 | |
9f0bdab8 | 893 | linux_nat_switch_fork (inferior_ptid); |
ef29ce1a | 894 | check_for_thread_db (); |
4de4c07c | 895 | |
4e1c45ea PA |
896 | tp = inferior_thread (); |
897 | tp->step_resume_breakpoint = step_resume_breakpoint; | |
898 | tp->step_range_start = step_range_start; | |
899 | tp->step_range_end = step_range_end; | |
900 | tp->step_frame_id = step_frame_id; | |
901 | ||
4de4c07c DJ |
902 | /* Reset breakpoints in the child as appropriate. */ |
903 | follow_inferior_reset_breakpoints (); | |
904 | } | |
905 | ||
b84876c2 PA |
906 | if (target_can_async_p ()) |
907 | target_async (inferior_event_handler, 0); | |
908 | ||
4de4c07c DJ |
909 | return 0; |
910 | } | |
911 | ||
4de4c07c | 912 | \f |
6d8fd2b7 UW |
913 | static void |
914 | linux_child_insert_fork_catchpoint (int pid) | |
4de4c07c | 915 | { |
b957e937 | 916 | if (! linux_supports_tracefork (pid)) |
8a3fe4f8 | 917 | error (_("Your system does not support fork catchpoints.")); |
3993f6b1 DJ |
918 | } |
919 | ||
6d8fd2b7 UW |
920 | static void |
921 | linux_child_insert_vfork_catchpoint (int pid) | |
3993f6b1 | 922 | { |
b957e937 | 923 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 924 | error (_("Your system does not support vfork catchpoints.")); |
3993f6b1 DJ |
925 | } |
926 | ||
6d8fd2b7 UW |
927 | static void |
928 | linux_child_insert_exec_catchpoint (int pid) | |
3993f6b1 | 929 | { |
b957e937 | 930 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 931 | error (_("Your system does not support exec catchpoints.")); |
3993f6b1 DJ |
932 | } |
933 | ||
d6b0e80f AC |
934 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's |
935 | are processes sharing the same VM space. A multi-threaded process | |
936 | is basically a group of such processes. However, such a grouping | |
937 | is almost entirely a user-space issue; the kernel doesn't enforce | |
938 | such a grouping at all (this might change in the future). In | |
939 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
940 | Threads library) to provide such a grouping. | |
941 | ||
942 | It is perfectly well possible to write a multi-threaded application | |
943 | without the assistance of a threads library, by using the clone | |
944 | system call directly. This module should be able to give some | |
945 | rudimentary support for debugging such applications if developers | |
946 | specify the CLONE_PTRACE flag in the clone system call, and are | |
947 | using the Linux kernel 2.4 or above. | |
948 | ||
949 | Note that there are some peculiarities in GNU/Linux that affect | |
950 | this code: | |
951 | ||
952 | - In general one should specify the __WCLONE flag to waitpid in | |
953 | order to make it report events for any of the cloned processes | |
954 | (and leave it out for the initial process). However, if a cloned | |
955 | process has exited the exit status is only reported if the | |
956 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
957 | we cannot use it since GDB must work on older systems too. | |
958 | ||
959 | - When a traced, cloned process exits and is waited for by the | |
960 | debugger, the kernel reassigns it to the original parent and | |
961 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
962 | library doesn't notice this, which leads to the "zombie problem": | |
963 | When debugged a multi-threaded process that spawns a lot of | |
964 | threads will run out of processes, even if the threads exit, | |
965 | because the "zombies" stay around. */ | |
966 | ||
967 | /* List of known LWPs. */ | |
9f0bdab8 | 968 | struct lwp_info *lwp_list; |
d6b0e80f AC |
969 | |
970 | /* Number of LWPs in the list. */ | |
971 | static int num_lwps; | |
d6b0e80f AC |
972 | \f |
973 | ||
d6b0e80f AC |
974 | /* Original signal mask. */ |
975 | static sigset_t normal_mask; | |
976 | ||
977 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
978 | _initialize_linux_nat. */ | |
979 | static sigset_t suspend_mask; | |
980 | ||
b84876c2 PA |
981 | /* SIGCHLD action for synchronous mode. */ |
982 | struct sigaction sync_sigchld_action; | |
983 | ||
984 | /* SIGCHLD action for asynchronous mode. */ | |
985 | static struct sigaction async_sigchld_action; | |
84e46146 PA |
986 | |
987 | /* SIGCHLD default action, to pass to new inferiors. */ | |
988 | static struct sigaction sigchld_default_action; | |
d6b0e80f AC |
989 | \f |
990 | ||
991 | /* Prototypes for local functions. */ | |
992 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
993 | static int linux_nat_thread_alive (ptid_t ptid); | |
6d8fd2b7 | 994 | static char *linux_child_pid_to_exec_file (int pid); |
710151dd PA |
995 | static int cancel_breakpoint (struct lwp_info *lp); |
996 | ||
d6b0e80f AC |
997 | \f |
998 | /* Convert wait status STATUS to a string. Used for printing debug | |
999 | messages only. */ | |
1000 | ||
1001 | static char * | |
1002 | status_to_str (int status) | |
1003 | { | |
1004 | static char buf[64]; | |
1005 | ||
1006 | if (WIFSTOPPED (status)) | |
1007 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
1008 | strsignal (WSTOPSIG (status))); | |
1009 | else if (WIFSIGNALED (status)) | |
1010 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
1011 | strsignal (WSTOPSIG (status))); | |
1012 | else | |
1013 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
1014 | ||
1015 | return buf; | |
1016 | } | |
1017 | ||
1018 | /* Initialize the list of LWPs. Note that this module, contrary to | |
1019 | what GDB's generic threads layer does for its thread list, | |
1020 | re-initializes the LWP lists whenever we mourn or detach (which | |
1021 | doesn't involve mourning) the inferior. */ | |
1022 | ||
1023 | static void | |
1024 | init_lwp_list (void) | |
1025 | { | |
1026 | struct lwp_info *lp, *lpnext; | |
1027 | ||
1028 | for (lp = lwp_list; lp; lp = lpnext) | |
1029 | { | |
1030 | lpnext = lp->next; | |
1031 | xfree (lp); | |
1032 | } | |
1033 | ||
1034 | lwp_list = NULL; | |
1035 | num_lwps = 0; | |
d6b0e80f AC |
1036 | } |
1037 | ||
f973ed9c | 1038 | /* Add the LWP specified by PID to the list. Return a pointer to the |
9f0bdab8 DJ |
1039 | structure describing the new LWP. The LWP should already be stopped |
1040 | (with an exception for the very first LWP). */ | |
d6b0e80f AC |
1041 | |
1042 | static struct lwp_info * | |
1043 | add_lwp (ptid_t ptid) | |
1044 | { | |
1045 | struct lwp_info *lp; | |
1046 | ||
1047 | gdb_assert (is_lwp (ptid)); | |
1048 | ||
1049 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
1050 | ||
1051 | memset (lp, 0, sizeof (struct lwp_info)); | |
1052 | ||
1053 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
1054 | ||
1055 | lp->ptid = ptid; | |
1056 | ||
1057 | lp->next = lwp_list; | |
1058 | lwp_list = lp; | |
f973ed9c | 1059 | ++num_lwps; |
d6b0e80f | 1060 | |
9f0bdab8 DJ |
1061 | if (num_lwps > 1 && linux_nat_new_thread != NULL) |
1062 | linux_nat_new_thread (ptid); | |
1063 | ||
d6b0e80f AC |
1064 | return lp; |
1065 | } | |
1066 | ||
1067 | /* Remove the LWP specified by PID from the list. */ | |
1068 | ||
1069 | static void | |
1070 | delete_lwp (ptid_t ptid) | |
1071 | { | |
1072 | struct lwp_info *lp, *lpprev; | |
1073 | ||
1074 | lpprev = NULL; | |
1075 | ||
1076 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
1077 | if (ptid_equal (lp->ptid, ptid)) | |
1078 | break; | |
1079 | ||
1080 | if (!lp) | |
1081 | return; | |
1082 | ||
d6b0e80f AC |
1083 | num_lwps--; |
1084 | ||
1085 | if (lpprev) | |
1086 | lpprev->next = lp->next; | |
1087 | else | |
1088 | lwp_list = lp->next; | |
1089 | ||
1090 | xfree (lp); | |
1091 | } | |
1092 | ||
1093 | /* Return a pointer to the structure describing the LWP corresponding | |
1094 | to PID. If no corresponding LWP could be found, return NULL. */ | |
1095 | ||
1096 | static struct lwp_info * | |
1097 | find_lwp_pid (ptid_t ptid) | |
1098 | { | |
1099 | struct lwp_info *lp; | |
1100 | int lwp; | |
1101 | ||
1102 | if (is_lwp (ptid)) | |
1103 | lwp = GET_LWP (ptid); | |
1104 | else | |
1105 | lwp = GET_PID (ptid); | |
1106 | ||
1107 | for (lp = lwp_list; lp; lp = lp->next) | |
1108 | if (lwp == GET_LWP (lp->ptid)) | |
1109 | return lp; | |
1110 | ||
1111 | return NULL; | |
1112 | } | |
1113 | ||
1114 | /* Call CALLBACK with its second argument set to DATA for every LWP in | |
1115 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1116 | pointer to the structure describing that LWP immediately. | |
1117 | Otherwise return NULL. */ | |
1118 | ||
1119 | struct lwp_info * | |
1120 | iterate_over_lwps (int (*callback) (struct lwp_info *, void *), void *data) | |
1121 | { | |
1122 | struct lwp_info *lp, *lpnext; | |
1123 | ||
1124 | for (lp = lwp_list; lp; lp = lpnext) | |
1125 | { | |
1126 | lpnext = lp->next; | |
1127 | if ((*callback) (lp, data)) | |
1128 | return lp; | |
1129 | } | |
1130 | ||
1131 | return NULL; | |
1132 | } | |
1133 | ||
f973ed9c DJ |
1134 | /* Update our internal state when changing from one fork (checkpoint, |
1135 | et cetera) to another indicated by NEW_PTID. We can only switch | |
1136 | single-threaded applications, so we only create one new LWP, and | |
1137 | the previous list is discarded. */ | |
1138 | ||
1139 | void | |
1140 | linux_nat_switch_fork (ptid_t new_ptid) | |
1141 | { | |
1142 | struct lwp_info *lp; | |
1143 | ||
1144 | init_lwp_list (); | |
1145 | lp = add_lwp (new_ptid); | |
1146 | lp->stopped = 1; | |
e26af52f | 1147 | |
4f8d22e3 PA |
1148 | init_thread_list (); |
1149 | add_thread_silent (new_ptid); | |
e26af52f DJ |
1150 | } |
1151 | ||
e26af52f DJ |
1152 | /* Handle the exit of a single thread LP. */ |
1153 | ||
1154 | static void | |
1155 | exit_lwp (struct lwp_info *lp) | |
1156 | { | |
063bfe2e VP |
1157 | struct thread_info *th = find_thread_pid (lp->ptid); |
1158 | ||
1159 | if (th) | |
e26af52f | 1160 | { |
17faa917 DJ |
1161 | if (print_thread_events) |
1162 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1163 | ||
4f8d22e3 | 1164 | delete_thread (lp->ptid); |
e26af52f DJ |
1165 | } |
1166 | ||
1167 | delete_lwp (lp->ptid); | |
1168 | } | |
1169 | ||
a0ef4274 DJ |
1170 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1171 | Other states including `T (tracing stop)' are reported as false. */ | |
1172 | ||
1173 | static int | |
1174 | pid_is_stopped (pid_t pid) | |
1175 | { | |
1176 | FILE *status_file; | |
1177 | char buf[100]; | |
1178 | int retval = 0; | |
1179 | ||
1180 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1181 | status_file = fopen (buf, "r"); | |
1182 | if (status_file != NULL) | |
1183 | { | |
1184 | int have_state = 0; | |
1185 | ||
1186 | while (fgets (buf, sizeof (buf), status_file)) | |
1187 | { | |
1188 | if (strncmp (buf, "State:", 6) == 0) | |
1189 | { | |
1190 | have_state = 1; | |
1191 | break; | |
1192 | } | |
1193 | } | |
1194 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1195 | retval = 1; | |
1196 | fclose (status_file); | |
1197 | } | |
1198 | return retval; | |
1199 | } | |
1200 | ||
1201 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1202 | Returns a wait status for that LWP, to cache. */ | |
1203 | ||
1204 | static int | |
1205 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1206 | int *signalled) | |
1207 | { | |
1208 | pid_t new_pid, pid = GET_LWP (ptid); | |
1209 | int status; | |
1210 | ||
1211 | if (pid_is_stopped (pid)) | |
1212 | { | |
1213 | if (debug_linux_nat) | |
1214 | fprintf_unfiltered (gdb_stdlog, | |
1215 | "LNPAW: Attaching to a stopped process\n"); | |
1216 | ||
1217 | /* The process is definitely stopped. It is in a job control | |
1218 | stop, unless the kernel predates the TASK_STOPPED / | |
1219 | TASK_TRACED distinction, in which case it might be in a | |
1220 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1221 | can kill it, signal it, et cetera. | |
1222 | ||
1223 | First make sure there is a pending SIGSTOP. Since we are | |
1224 | already attached, the process can not transition from stopped | |
1225 | to running without a PTRACE_CONT; so we know this signal will | |
1226 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1227 | probably already in the queue (unless this kernel is old | |
1228 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1229 | is not an RT signal, it can only be queued once. */ | |
1230 | kill_lwp (pid, SIGSTOP); | |
1231 | ||
1232 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1233 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1234 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1235 | } | |
1236 | ||
1237 | /* Make sure the initial process is stopped. The user-level threads | |
1238 | layer might want to poke around in the inferior, and that won't | |
1239 | work if things haven't stabilized yet. */ | |
1240 | new_pid = my_waitpid (pid, &status, 0); | |
1241 | if (new_pid == -1 && errno == ECHILD) | |
1242 | { | |
1243 | if (first) | |
1244 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1245 | ||
1246 | /* Try again with __WCLONE to check cloned processes. */ | |
1247 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1248 | *cloned = 1; | |
1249 | } | |
1250 | ||
1251 | gdb_assert (pid == new_pid && WIFSTOPPED (status)); | |
1252 | ||
1253 | if (WSTOPSIG (status) != SIGSTOP) | |
1254 | { | |
1255 | *signalled = 1; | |
1256 | if (debug_linux_nat) | |
1257 | fprintf_unfiltered (gdb_stdlog, | |
1258 | "LNPAW: Received %s after attaching\n", | |
1259 | status_to_str (status)); | |
1260 | } | |
1261 | ||
1262 | return status; | |
1263 | } | |
1264 | ||
1265 | /* Attach to the LWP specified by PID. Return 0 if successful or -1 | |
1266 | if the new LWP could not be attached. */ | |
d6b0e80f | 1267 | |
9ee57c33 | 1268 | int |
93815fbf | 1269 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1270 | { |
9ee57c33 | 1271 | struct lwp_info *lp; |
84e46146 | 1272 | enum sigchld_state async_events_original_state; |
d6b0e80f AC |
1273 | |
1274 | gdb_assert (is_lwp (ptid)); | |
1275 | ||
84e46146 | 1276 | async_events_original_state = linux_nat_async_events (sigchld_sync); |
d6b0e80f | 1277 | |
9ee57c33 | 1278 | lp = find_lwp_pid (ptid); |
d6b0e80f AC |
1279 | |
1280 | /* We assume that we're already attached to any LWP that has an id | |
1281 | equal to the overall process id, and to any LWP that is already | |
1282 | in our list of LWPs. If we're not seeing exit events from threads | |
1283 | and we've had PID wraparound since we last tried to stop all threads, | |
1284 | this assumption might be wrong; fortunately, this is very unlikely | |
1285 | to happen. */ | |
9ee57c33 | 1286 | if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1287 | { |
a0ef4274 | 1288 | int status, cloned = 0, signalled = 0; |
d6b0e80f AC |
1289 | |
1290 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
9ee57c33 DJ |
1291 | { |
1292 | /* If we fail to attach to the thread, issue a warning, | |
1293 | but continue. One way this can happen is if thread | |
e9efe249 | 1294 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1295 | bug may place threads in the thread list and then fail |
1296 | to create them. */ | |
1297 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1298 | safe_strerror (errno)); | |
1299 | return -1; | |
1300 | } | |
1301 | ||
d6b0e80f AC |
1302 | if (debug_linux_nat) |
1303 | fprintf_unfiltered (gdb_stdlog, | |
1304 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1305 | target_pid_to_str (ptid)); | |
1306 | ||
a0ef4274 DJ |
1307 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
1308 | lp = add_lwp (ptid); | |
1309 | lp->stopped = 1; | |
1310 | lp->cloned = cloned; | |
1311 | lp->signalled = signalled; | |
1312 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1313 | { |
a0ef4274 DJ |
1314 | lp->resumed = 1; |
1315 | lp->status = status; | |
d6b0e80f AC |
1316 | } |
1317 | ||
a0ef4274 | 1318 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1319 | |
1320 | if (debug_linux_nat) | |
1321 | { | |
1322 | fprintf_unfiltered (gdb_stdlog, | |
1323 | "LLAL: waitpid %s received %s\n", | |
1324 | target_pid_to_str (ptid), | |
1325 | status_to_str (status)); | |
1326 | } | |
1327 | } | |
1328 | else | |
1329 | { | |
1330 | /* We assume that the LWP representing the original process is | |
1331 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1332 | that the GNU/linux ptrace layer uses to keep track of |
1333 | threads. Note that this won't have already been done since | |
1334 | the main thread will have, we assume, been stopped by an | |
1335 | attach from a different layer. */ | |
9ee57c33 DJ |
1336 | if (lp == NULL) |
1337 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1338 | lp->stopped = 1; |
1339 | } | |
9ee57c33 | 1340 | |
84e46146 | 1341 | linux_nat_async_events (async_events_original_state); |
9ee57c33 | 1342 | return 0; |
d6b0e80f AC |
1343 | } |
1344 | ||
b84876c2 | 1345 | static void |
136d6dae VP |
1346 | linux_nat_create_inferior (struct target_ops *ops, |
1347 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1348 | int from_tty) |
1349 | { | |
1350 | int saved_async = 0; | |
10568435 JK |
1351 | #ifdef HAVE_PERSONALITY |
1352 | int personality_orig = 0, personality_set = 0; | |
1353 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1354 | |
1355 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1356 | we have to mask the async mode. */ | |
1357 | ||
1358 | if (target_can_async_p ()) | |
84e46146 PA |
1359 | /* Mask async mode. Creating a child requires a loop calling |
1360 | wait_for_inferior currently. */ | |
b84876c2 PA |
1361 | saved_async = linux_nat_async_mask (0); |
1362 | else | |
1363 | { | |
1364 | /* Restore the original signal mask. */ | |
1365 | sigprocmask (SIG_SETMASK, &normal_mask, NULL); | |
1366 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
1367 | suspend_mask = normal_mask; | |
1368 | sigdelset (&suspend_mask, SIGCHLD); | |
1369 | } | |
1370 | ||
84e46146 PA |
1371 | /* Set SIGCHLD to the default action, until after execing the child, |
1372 | since the inferior inherits the superior's signal mask. It will | |
1373 | be blocked again in linux_nat_wait, which is only reached after | |
1374 | the inferior execing. */ | |
1375 | linux_nat_async_events (sigchld_default); | |
1376 | ||
10568435 JK |
1377 | #ifdef HAVE_PERSONALITY |
1378 | if (disable_randomization) | |
1379 | { | |
1380 | errno = 0; | |
1381 | personality_orig = personality (0xffffffff); | |
1382 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1383 | { | |
1384 | personality_set = 1; | |
1385 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1386 | } | |
1387 | if (errno != 0 || (personality_set | |
1388 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1389 | warning (_("Error disabling address space randomization: %s"), | |
1390 | safe_strerror (errno)); | |
1391 | } | |
1392 | #endif /* HAVE_PERSONALITY */ | |
1393 | ||
136d6dae | 1394 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1395 | |
10568435 JK |
1396 | #ifdef HAVE_PERSONALITY |
1397 | if (personality_set) | |
1398 | { | |
1399 | errno = 0; | |
1400 | personality (personality_orig); | |
1401 | if (errno != 0) | |
1402 | warning (_("Error restoring address space randomization: %s"), | |
1403 | safe_strerror (errno)); | |
1404 | } | |
1405 | #endif /* HAVE_PERSONALITY */ | |
1406 | ||
b84876c2 PA |
1407 | if (saved_async) |
1408 | linux_nat_async_mask (saved_async); | |
1409 | } | |
1410 | ||
d6b0e80f | 1411 | static void |
136d6dae | 1412 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1413 | { |
1414 | struct lwp_info *lp; | |
d6b0e80f | 1415 | int status; |
af990527 | 1416 | ptid_t ptid; |
d6b0e80f AC |
1417 | |
1418 | /* FIXME: We should probably accept a list of process id's, and | |
1419 | attach all of them. */ | |
136d6dae | 1420 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1421 | |
b84876c2 PA |
1422 | if (!target_can_async_p ()) |
1423 | { | |
1424 | /* Restore the original signal mask. */ | |
1425 | sigprocmask (SIG_SETMASK, &normal_mask, NULL); | |
1426 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
1427 | suspend_mask = normal_mask; | |
1428 | sigdelset (&suspend_mask, SIGCHLD); | |
1429 | } | |
1430 | ||
af990527 PA |
1431 | /* The ptrace base target adds the main thread with (pid,0,0) |
1432 | format. Decorate it with lwp info. */ | |
1433 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1434 | thread_change_ptid (inferior_ptid, ptid); | |
1435 | ||
9f0bdab8 | 1436 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1437 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1438 | |
1439 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1440 | &lp->signalled); | |
1441 | lp->stopped = 1; | |
9f0bdab8 | 1442 | |
a0ef4274 | 1443 | /* Save the wait status to report later. */ |
d6b0e80f | 1444 | lp->resumed = 1; |
a0ef4274 DJ |
1445 | if (debug_linux_nat) |
1446 | fprintf_unfiltered (gdb_stdlog, | |
1447 | "LNA: waitpid %ld, saving status %s\n", | |
1448 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd PA |
1449 | |
1450 | if (!target_can_async_p ()) | |
a0ef4274 | 1451 | lp->status = status; |
710151dd PA |
1452 | else |
1453 | { | |
1454 | /* We already waited for this LWP, so put the wait result on the | |
1455 | pipe. The event loop will wake up and gets us to handling | |
1456 | this event. */ | |
a0ef4274 DJ |
1457 | linux_nat_event_pipe_push (GET_PID (lp->ptid), status, |
1458 | lp->cloned ? __WCLONE : 0); | |
b84876c2 PA |
1459 | /* Register in the event loop. */ |
1460 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1461 | } |
1462 | } | |
1463 | ||
a0ef4274 DJ |
1464 | /* Get pending status of LP. */ |
1465 | static int | |
1466 | get_pending_status (struct lwp_info *lp, int *status) | |
1467 | { | |
1468 | struct target_waitstatus last; | |
1469 | ptid_t last_ptid; | |
1470 | ||
1471 | get_last_target_status (&last_ptid, &last); | |
1472 | ||
1473 | /* If this lwp is the ptid that GDB is processing an event from, the | |
1474 | signal will be in stop_signal. Otherwise, in all-stop + sync | |
1475 | mode, we may cache pending events in lp->status while trying to | |
1476 | stop all threads (see stop_wait_callback). In async mode, the | |
1477 | events are always cached in waitpid_queue. */ | |
1478 | ||
1479 | *status = 0; | |
4c28f408 PA |
1480 | |
1481 | if (non_stop) | |
a0ef4274 | 1482 | { |
4c28f408 PA |
1483 | enum target_signal signo = TARGET_SIGNAL_0; |
1484 | ||
1485 | if (is_executing (lp->ptid)) | |
1486 | { | |
1487 | /* If the core thought this lwp was executing --- e.g., the | |
1488 | executing property hasn't been updated yet, but the | |
1489 | thread has been stopped with a stop_callback / | |
1490 | stop_wait_callback sequence (see linux_nat_detach for | |
1491 | example) --- we can only have pending events in the local | |
1492 | queue. */ | |
1493 | if (queued_waitpid (GET_LWP (lp->ptid), status, __WALL) != -1) | |
1494 | { | |
8b8655b3 TJB |
1495 | if (WIFSTOPPED (*status)) |
1496 | signo = target_signal_from_host (WSTOPSIG (*status)); | |
4c28f408 PA |
1497 | |
1498 | /* If not stopped, then the lwp is gone, no use in | |
1499 | resending a signal. */ | |
1500 | } | |
1501 | } | |
1502 | else | |
1503 | { | |
1504 | /* If the core knows the thread is not executing, then we | |
1505 | have the last signal recorded in | |
2020b7ab | 1506 | thread_info->stop_signal. */ |
4c28f408 | 1507 | |
2020b7ab PA |
1508 | struct thread_info *tp = find_thread_pid (lp->ptid); |
1509 | signo = tp->stop_signal; | |
4c28f408 PA |
1510 | } |
1511 | ||
1512 | if (signo != TARGET_SIGNAL_0 | |
1513 | && !signal_pass_state (signo)) | |
1514 | { | |
1515 | if (debug_linux_nat) | |
1516 | fprintf_unfiltered (gdb_stdlog, "\ | |
1517 | GPT: lwp %s had signal %s, but it is in no pass state\n", | |
1518 | target_pid_to_str (lp->ptid), | |
1519 | target_signal_to_string (signo)); | |
1520 | } | |
1521 | else | |
1522 | { | |
1523 | if (signo != TARGET_SIGNAL_0) | |
1524 | *status = W_STOPCODE (target_signal_to_host (signo)); | |
1525 | ||
1526 | if (debug_linux_nat) | |
1527 | fprintf_unfiltered (gdb_stdlog, | |
1528 | "GPT: lwp %s as pending signal %s\n", | |
1529 | target_pid_to_str (lp->ptid), | |
1530 | target_signal_to_string (signo)); | |
1531 | } | |
a0ef4274 | 1532 | } |
a0ef4274 | 1533 | else |
4c28f408 PA |
1534 | { |
1535 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) | |
1536 | { | |
2020b7ab PA |
1537 | struct thread_info *tp = find_thread_pid (lp->ptid); |
1538 | if (tp->stop_signal != TARGET_SIGNAL_0 | |
1539 | && signal_pass_state (tp->stop_signal)) | |
1540 | *status = W_STOPCODE (target_signal_to_host (tp->stop_signal)); | |
4c28f408 PA |
1541 | } |
1542 | else if (target_can_async_p ()) | |
1543 | queued_waitpid (GET_LWP (lp->ptid), status, __WALL); | |
1544 | else | |
1545 | *status = lp->status; | |
1546 | } | |
a0ef4274 DJ |
1547 | |
1548 | return 0; | |
1549 | } | |
1550 | ||
d6b0e80f AC |
1551 | static int |
1552 | detach_callback (struct lwp_info *lp, void *data) | |
1553 | { | |
1554 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1555 | ||
1556 | if (debug_linux_nat && lp->status) | |
1557 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1558 | strsignal (WSTOPSIG (lp->status)), | |
1559 | target_pid_to_str (lp->ptid)); | |
1560 | ||
a0ef4274 DJ |
1561 | /* If there is a pending SIGSTOP, get rid of it. */ |
1562 | if (lp->signalled) | |
d6b0e80f | 1563 | { |
d6b0e80f AC |
1564 | if (debug_linux_nat) |
1565 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1566 | "DC: Sending SIGCONT to %s\n", |
1567 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1568 | |
a0ef4274 | 1569 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1570 | lp->signalled = 0; |
d6b0e80f AC |
1571 | } |
1572 | ||
1573 | /* We don't actually detach from the LWP that has an id equal to the | |
1574 | overall process id just yet. */ | |
1575 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1576 | { | |
a0ef4274 DJ |
1577 | int status = 0; |
1578 | ||
1579 | /* Pass on any pending signal for this LWP. */ | |
1580 | get_pending_status (lp, &status); | |
1581 | ||
d6b0e80f AC |
1582 | errno = 0; |
1583 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1584 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1585 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1586 | safe_strerror (errno)); |
1587 | ||
1588 | if (debug_linux_nat) | |
1589 | fprintf_unfiltered (gdb_stdlog, | |
1590 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1591 | target_pid_to_str (lp->ptid), | |
1592 | strsignal (WSTOPSIG (lp->status))); | |
1593 | ||
1594 | delete_lwp (lp->ptid); | |
1595 | } | |
1596 | ||
1597 | return 0; | |
1598 | } | |
1599 | ||
1600 | static void | |
136d6dae | 1601 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1602 | { |
b84876c2 | 1603 | int pid; |
a0ef4274 DJ |
1604 | int status; |
1605 | enum target_signal sig; | |
1606 | ||
b84876c2 PA |
1607 | if (target_can_async_p ()) |
1608 | linux_nat_async (NULL, 0); | |
1609 | ||
4c28f408 PA |
1610 | /* Stop all threads before detaching. ptrace requires that the |
1611 | thread is stopped to sucessfully detach. */ | |
1612 | iterate_over_lwps (stop_callback, NULL); | |
1613 | /* ... and wait until all of them have reported back that | |
1614 | they're no longer running. */ | |
1615 | iterate_over_lwps (stop_wait_callback, NULL); | |
1616 | ||
d6b0e80f AC |
1617 | iterate_over_lwps (detach_callback, NULL); |
1618 | ||
1619 | /* Only the initial process should be left right now. */ | |
1620 | gdb_assert (num_lwps == 1); | |
1621 | ||
a0ef4274 DJ |
1622 | /* Pass on any pending signal for the last LWP. */ |
1623 | if ((args == NULL || *args == '\0') | |
1624 | && get_pending_status (lwp_list, &status) != -1 | |
1625 | && WIFSTOPPED (status)) | |
1626 | { | |
1627 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1628 | pass it along with PTRACE_DETACH. */ | |
1629 | args = alloca (8); | |
1630 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
1631 | fprintf_unfiltered (gdb_stdlog, | |
1632 | "LND: Sending signal %s to %s\n", | |
1633 | args, | |
1634 | target_pid_to_str (lwp_list->ptid)); | |
1635 | } | |
1636 | ||
d6b0e80f AC |
1637 | /* Destroy LWP info; it's no longer valid. */ |
1638 | init_lwp_list (); | |
1639 | ||
7a7d3353 | 1640 | pid = ptid_get_pid (inferior_ptid); |
b84876c2 PA |
1641 | |
1642 | if (target_can_async_p ()) | |
1643 | drain_queued_events (pid); | |
7a7d3353 PA |
1644 | |
1645 | if (forks_exist_p ()) | |
1646 | { | |
1647 | /* Multi-fork case. The current inferior_ptid is being detached | |
1648 | from, but there are other viable forks to debug. Detach from | |
1649 | the current fork, and context-switch to the first | |
1650 | available. */ | |
1651 | linux_fork_detach (args, from_tty); | |
1652 | ||
1653 | if (non_stop && target_can_async_p ()) | |
1654 | target_async (inferior_event_handler, 0); | |
1655 | } | |
1656 | else | |
1657 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1658 | } |
1659 | ||
1660 | /* Resume LP. */ | |
1661 | ||
1662 | static int | |
1663 | resume_callback (struct lwp_info *lp, void *data) | |
1664 | { | |
1665 | if (lp->stopped && lp->status == 0) | |
1666 | { | |
10d6c8cd DJ |
1667 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), |
1668 | 0, TARGET_SIGNAL_0); | |
d6b0e80f AC |
1669 | if (debug_linux_nat) |
1670 | fprintf_unfiltered (gdb_stdlog, | |
1671 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", | |
1672 | target_pid_to_str (lp->ptid)); | |
1673 | lp->stopped = 0; | |
1674 | lp->step = 0; | |
9f0bdab8 | 1675 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
d6b0e80f | 1676 | } |
57380f4e DJ |
1677 | else if (lp->stopped && debug_linux_nat) |
1678 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (has pending)\n", | |
1679 | target_pid_to_str (lp->ptid)); | |
1680 | else if (debug_linux_nat) | |
1681 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (not stopped)\n", | |
1682 | target_pid_to_str (lp->ptid)); | |
d6b0e80f AC |
1683 | |
1684 | return 0; | |
1685 | } | |
1686 | ||
1687 | static int | |
1688 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1689 | { | |
1690 | lp->resumed = 0; | |
1691 | return 0; | |
1692 | } | |
1693 | ||
1694 | static int | |
1695 | resume_set_callback (struct lwp_info *lp, void *data) | |
1696 | { | |
1697 | lp->resumed = 1; | |
1698 | return 0; | |
1699 | } | |
1700 | ||
1701 | static void | |
1702 | linux_nat_resume (ptid_t ptid, int step, enum target_signal signo) | |
1703 | { | |
1704 | struct lwp_info *lp; | |
1705 | int resume_all; | |
1706 | ||
76f50ad1 DJ |
1707 | if (debug_linux_nat) |
1708 | fprintf_unfiltered (gdb_stdlog, | |
1709 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1710 | step ? "step" : "resume", | |
1711 | target_pid_to_str (ptid), | |
1712 | signo ? strsignal (signo) : "0", | |
1713 | target_pid_to_str (inferior_ptid)); | |
1714 | ||
b84876c2 PA |
1715 | if (target_can_async_p ()) |
1716 | /* Block events while we're here. */ | |
84e46146 | 1717 | linux_nat_async_events (sigchld_sync); |
b84876c2 | 1718 | |
d6b0e80f AC |
1719 | /* A specific PTID means `step only this process id'. */ |
1720 | resume_all = (PIDGET (ptid) == -1); | |
1721 | ||
4c28f408 PA |
1722 | if (non_stop && resume_all) |
1723 | internal_error (__FILE__, __LINE__, | |
1724 | "can't resume all in non-stop mode"); | |
1725 | ||
1726 | if (!non_stop) | |
1727 | { | |
1728 | if (resume_all) | |
1729 | iterate_over_lwps (resume_set_callback, NULL); | |
1730 | else | |
1731 | iterate_over_lwps (resume_clear_callback, NULL); | |
1732 | } | |
d6b0e80f AC |
1733 | |
1734 | /* If PID is -1, it's the current inferior that should be | |
1735 | handled specially. */ | |
1736 | if (PIDGET (ptid) == -1) | |
1737 | ptid = inferior_ptid; | |
1738 | ||
1739 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1740 | gdb_assert (lp != NULL); |
d6b0e80f | 1741 | |
4c28f408 | 1742 | /* Convert to something the lower layer understands. */ |
9f0bdab8 | 1743 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); |
d6b0e80f | 1744 | |
9f0bdab8 DJ |
1745 | /* Remember if we're stepping. */ |
1746 | lp->step = step; | |
d6b0e80f | 1747 | |
9f0bdab8 DJ |
1748 | /* Mark this LWP as resumed. */ |
1749 | lp->resumed = 1; | |
76f50ad1 | 1750 | |
9f0bdab8 DJ |
1751 | /* If we have a pending wait status for this thread, there is no |
1752 | point in resuming the process. But first make sure that | |
1753 | linux_nat_wait won't preemptively handle the event - we | |
1754 | should never take this short-circuit if we are going to | |
1755 | leave LP running, since we have skipped resuming all the | |
1756 | other threads. This bit of code needs to be synchronized | |
1757 | with linux_nat_wait. */ | |
76f50ad1 | 1758 | |
710151dd PA |
1759 | /* In async mode, we never have pending wait status. */ |
1760 | if (target_can_async_p () && lp->status) | |
1761 | internal_error (__FILE__, __LINE__, "Pending status in async mode"); | |
1762 | ||
9f0bdab8 DJ |
1763 | if (lp->status && WIFSTOPPED (lp->status)) |
1764 | { | |
d6b48e9c PA |
1765 | int saved_signo; |
1766 | struct inferior *inf; | |
76f50ad1 | 1767 | |
d6b48e9c PA |
1768 | inf = find_inferior_pid (ptid_get_pid (ptid)); |
1769 | gdb_assert (inf); | |
1770 | saved_signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1771 | ||
1772 | /* Defer to common code if we're gaining control of the | |
1773 | inferior. */ | |
1774 | if (inf->stop_soon == NO_STOP_QUIETLY | |
1775 | && signal_stop_state (saved_signo) == 0 | |
9f0bdab8 DJ |
1776 | && signal_print_state (saved_signo) == 0 |
1777 | && signal_pass_state (saved_signo) == 1) | |
d6b0e80f | 1778 | { |
9f0bdab8 DJ |
1779 | if (debug_linux_nat) |
1780 | fprintf_unfiltered (gdb_stdlog, | |
1781 | "LLR: Not short circuiting for ignored " | |
1782 | "status 0x%x\n", lp->status); | |
1783 | ||
d6b0e80f AC |
1784 | /* FIXME: What should we do if we are supposed to continue |
1785 | this thread with a signal? */ | |
1786 | gdb_assert (signo == TARGET_SIGNAL_0); | |
9f0bdab8 DJ |
1787 | signo = saved_signo; |
1788 | lp->status = 0; | |
1789 | } | |
1790 | } | |
76f50ad1 | 1791 | |
9f0bdab8 DJ |
1792 | if (lp->status) |
1793 | { | |
1794 | /* FIXME: What should we do if we are supposed to continue | |
1795 | this thread with a signal? */ | |
1796 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1797 | |
9f0bdab8 DJ |
1798 | if (debug_linux_nat) |
1799 | fprintf_unfiltered (gdb_stdlog, | |
1800 | "LLR: Short circuiting for status 0x%x\n", | |
1801 | lp->status); | |
d6b0e80f | 1802 | |
9f0bdab8 | 1803 | return; |
d6b0e80f AC |
1804 | } |
1805 | ||
9f0bdab8 DJ |
1806 | /* Mark LWP as not stopped to prevent it from being continued by |
1807 | resume_callback. */ | |
1808 | lp->stopped = 0; | |
1809 | ||
d6b0e80f AC |
1810 | if (resume_all) |
1811 | iterate_over_lwps (resume_callback, NULL); | |
1812 | ||
10d6c8cd | 1813 | linux_ops->to_resume (ptid, step, signo); |
9f0bdab8 DJ |
1814 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
1815 | ||
d6b0e80f AC |
1816 | if (debug_linux_nat) |
1817 | fprintf_unfiltered (gdb_stdlog, | |
1818 | "LLR: %s %s, %s (resume event thread)\n", | |
1819 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1820 | target_pid_to_str (ptid), | |
1821 | signo ? strsignal (signo) : "0"); | |
b84876c2 PA |
1822 | |
1823 | if (target_can_async_p ()) | |
8ea051c5 | 1824 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
1825 | } |
1826 | ||
1827 | /* Issue kill to specified lwp. */ | |
1828 | ||
1829 | static int tkill_failed; | |
1830 | ||
1831 | static int | |
1832 | kill_lwp (int lwpid, int signo) | |
1833 | { | |
1834 | errno = 0; | |
1835 | ||
1836 | /* Use tkill, if possible, in case we are using nptl threads. If tkill | |
1837 | fails, then we are not using nptl threads and we should be using kill. */ | |
1838 | ||
1839 | #ifdef HAVE_TKILL_SYSCALL | |
1840 | if (!tkill_failed) | |
1841 | { | |
1842 | int ret = syscall (__NR_tkill, lwpid, signo); | |
1843 | if (errno != ENOSYS) | |
1844 | return ret; | |
1845 | errno = 0; | |
1846 | tkill_failed = 1; | |
1847 | } | |
1848 | #endif | |
1849 | ||
1850 | return kill (lwpid, signo); | |
1851 | } | |
1852 | ||
3d799a95 DJ |
1853 | /* Handle a GNU/Linux extended wait response. If we see a clone |
1854 | event, we need to add the new LWP to our list (and not report the | |
1855 | trap to higher layers). This function returns non-zero if the | |
1856 | event should be ignored and we should wait again. If STOPPING is | |
1857 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
1858 | |
1859 | static int | |
3d799a95 DJ |
1860 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
1861 | int stopping) | |
d6b0e80f | 1862 | { |
3d799a95 DJ |
1863 | int pid = GET_LWP (lp->ptid); |
1864 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
1865 | struct lwp_info *new_lp = NULL; | |
1866 | int event = status >> 16; | |
d6b0e80f | 1867 | |
3d799a95 DJ |
1868 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
1869 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 1870 | { |
3d799a95 DJ |
1871 | unsigned long new_pid; |
1872 | int ret; | |
1873 | ||
1874 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 1875 | |
3d799a95 DJ |
1876 | /* If we haven't already seen the new PID stop, wait for it now. */ |
1877 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
1878 | { | |
1879 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
1880 | hits the SIGSTOP, but we're already attached. */ | |
1881 | ret = my_waitpid (new_pid, &status, | |
1882 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
1883 | if (ret == -1) | |
1884 | perror_with_name (_("waiting for new child")); | |
1885 | else if (ret != new_pid) | |
1886 | internal_error (__FILE__, __LINE__, | |
1887 | _("wait returned unexpected PID %d"), ret); | |
1888 | else if (!WIFSTOPPED (status)) | |
1889 | internal_error (__FILE__, __LINE__, | |
1890 | _("wait returned unexpected status 0x%x"), status); | |
1891 | } | |
1892 | ||
3a3e9ee3 | 1893 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 DJ |
1894 | |
1895 | if (event == PTRACE_EVENT_FORK) | |
1896 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
1897 | else if (event == PTRACE_EVENT_VFORK) | |
1898 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 1899 | else |
3d799a95 | 1900 | { |
4c28f408 PA |
1901 | struct cleanup *old_chain; |
1902 | ||
3d799a95 DJ |
1903 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1904 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (inferior_ptid))); | |
1905 | new_lp->cloned = 1; | |
4c28f408 | 1906 | new_lp->stopped = 1; |
d6b0e80f | 1907 | |
3d799a95 DJ |
1908 | if (WSTOPSIG (status) != SIGSTOP) |
1909 | { | |
1910 | /* This can happen if someone starts sending signals to | |
1911 | the new thread before it gets a chance to run, which | |
1912 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
1913 | This is an unlikely case, and harder to handle for | |
1914 | fork / vfork than for clone, so we do not try - but | |
1915 | we handle it for clone events here. We'll send | |
1916 | the other signal on to the thread below. */ | |
1917 | ||
1918 | new_lp->signalled = 1; | |
1919 | } | |
1920 | else | |
1921 | status = 0; | |
d6b0e80f | 1922 | |
4c28f408 | 1923 | if (non_stop) |
3d799a95 | 1924 | { |
4c28f408 PA |
1925 | /* Add the new thread to GDB's lists as soon as possible |
1926 | so that: | |
1927 | ||
1928 | 1) the frontend doesn't have to wait for a stop to | |
1929 | display them, and, | |
1930 | ||
1931 | 2) we tag it with the correct running state. */ | |
1932 | ||
1933 | /* If the thread_db layer is active, let it know about | |
1934 | this new thread, and add it to GDB's list. */ | |
1935 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
1936 | { | |
1937 | /* We're not using thread_db. Add it to GDB's | |
1938 | list. */ | |
1939 | target_post_attach (GET_LWP (new_lp->ptid)); | |
1940 | add_thread (new_lp->ptid); | |
1941 | } | |
1942 | ||
1943 | if (!stopping) | |
1944 | { | |
1945 | set_running (new_lp->ptid, 1); | |
1946 | set_executing (new_lp->ptid, 1); | |
1947 | } | |
1948 | } | |
1949 | ||
1950 | if (!stopping) | |
1951 | { | |
1952 | new_lp->stopped = 0; | |
3d799a95 | 1953 | new_lp->resumed = 1; |
4c28f408 | 1954 | ptrace (PTRACE_CONT, new_pid, 0, |
3d799a95 DJ |
1955 | status ? WSTOPSIG (status) : 0); |
1956 | } | |
d6b0e80f | 1957 | |
3d799a95 DJ |
1958 | if (debug_linux_nat) |
1959 | fprintf_unfiltered (gdb_stdlog, | |
1960 | "LHEW: Got clone event from LWP %ld, resuming\n", | |
1961 | GET_LWP (lp->ptid)); | |
1962 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1963 | ||
1964 | return 1; | |
1965 | } | |
1966 | ||
1967 | return 0; | |
d6b0e80f AC |
1968 | } |
1969 | ||
3d799a95 DJ |
1970 | if (event == PTRACE_EVENT_EXEC) |
1971 | { | |
1972 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
1973 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 1974 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 DJ |
1975 | |
1976 | if (linux_parent_pid) | |
1977 | { | |
1978 | detach_breakpoints (linux_parent_pid); | |
1979 | ptrace (PTRACE_DETACH, linux_parent_pid, 0, 0); | |
1980 | ||
1981 | linux_parent_pid = 0; | |
1982 | } | |
1983 | ||
25b22b0a PA |
1984 | /* At this point, all inserted breakpoints are gone. Doing this |
1985 | as soon as we detect an exec prevents the badness of deleting | |
1986 | a breakpoint writing the current "shadow contents" to lift | |
1987 | the bp. That shadow is NOT valid after an exec. | |
1988 | ||
1989 | Note that we have to do this after the detach_breakpoints | |
1990 | call above, otherwise breakpoints wouldn't be lifted from the | |
1991 | parent on a vfork, because detach_breakpoints would think | |
1992 | that breakpoints are not inserted. */ | |
1993 | mark_breakpoints_out (); | |
3d799a95 DJ |
1994 | return 0; |
1995 | } | |
1996 | ||
1997 | internal_error (__FILE__, __LINE__, | |
1998 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
1999 | } |
2000 | ||
2001 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
2002 | exited. */ | |
2003 | ||
2004 | static int | |
2005 | wait_lwp (struct lwp_info *lp) | |
2006 | { | |
2007 | pid_t pid; | |
2008 | int status; | |
2009 | int thread_dead = 0; | |
2010 | ||
2011 | gdb_assert (!lp->stopped); | |
2012 | gdb_assert (lp->status == 0); | |
2013 | ||
58aecb61 | 2014 | pid = my_waitpid (GET_LWP (lp->ptid), &status, 0); |
d6b0e80f AC |
2015 | if (pid == -1 && errno == ECHILD) |
2016 | { | |
58aecb61 | 2017 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE); |
d6b0e80f AC |
2018 | if (pid == -1 && errno == ECHILD) |
2019 | { | |
2020 | /* The thread has previously exited. We need to delete it | |
2021 | now because, for some vendor 2.4 kernels with NPTL | |
2022 | support backported, there won't be an exit event unless | |
2023 | it is the main thread. 2.6 kernels will report an exit | |
2024 | event for each thread that exits, as expected. */ | |
2025 | thread_dead = 1; | |
2026 | if (debug_linux_nat) | |
2027 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2028 | target_pid_to_str (lp->ptid)); | |
2029 | } | |
2030 | } | |
2031 | ||
2032 | if (!thread_dead) | |
2033 | { | |
2034 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
2035 | ||
2036 | if (debug_linux_nat) | |
2037 | { | |
2038 | fprintf_unfiltered (gdb_stdlog, | |
2039 | "WL: waitpid %s received %s\n", | |
2040 | target_pid_to_str (lp->ptid), | |
2041 | status_to_str (status)); | |
2042 | } | |
2043 | } | |
2044 | ||
2045 | /* Check if the thread has exited. */ | |
2046 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2047 | { | |
2048 | thread_dead = 1; | |
2049 | if (debug_linux_nat) | |
2050 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2051 | target_pid_to_str (lp->ptid)); | |
2052 | } | |
2053 | ||
2054 | if (thread_dead) | |
2055 | { | |
e26af52f | 2056 | exit_lwp (lp); |
d6b0e80f AC |
2057 | return 0; |
2058 | } | |
2059 | ||
2060 | gdb_assert (WIFSTOPPED (status)); | |
2061 | ||
2062 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
2063 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2064 | { | |
2065 | if (debug_linux_nat) | |
2066 | fprintf_unfiltered (gdb_stdlog, | |
2067 | "WL: Handling extended status 0x%06x\n", | |
2068 | status); | |
3d799a95 | 2069 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
2070 | return wait_lwp (lp); |
2071 | } | |
2072 | ||
2073 | return status; | |
2074 | } | |
2075 | ||
9f0bdab8 DJ |
2076 | /* Save the most recent siginfo for LP. This is currently only called |
2077 | for SIGTRAP; some ports use the si_addr field for | |
2078 | target_stopped_data_address. In the future, it may also be used to | |
2079 | restore the siginfo of requeued signals. */ | |
2080 | ||
2081 | static void | |
2082 | save_siginfo (struct lwp_info *lp) | |
2083 | { | |
2084 | errno = 0; | |
2085 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
2086 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
2087 | ||
2088 | if (errno != 0) | |
2089 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
2090 | } | |
2091 | ||
d6b0e80f AC |
2092 | /* Send a SIGSTOP to LP. */ |
2093 | ||
2094 | static int | |
2095 | stop_callback (struct lwp_info *lp, void *data) | |
2096 | { | |
2097 | if (!lp->stopped && !lp->signalled) | |
2098 | { | |
2099 | int ret; | |
2100 | ||
2101 | if (debug_linux_nat) | |
2102 | { | |
2103 | fprintf_unfiltered (gdb_stdlog, | |
2104 | "SC: kill %s **<SIGSTOP>**\n", | |
2105 | target_pid_to_str (lp->ptid)); | |
2106 | } | |
2107 | errno = 0; | |
2108 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
2109 | if (debug_linux_nat) | |
2110 | { | |
2111 | fprintf_unfiltered (gdb_stdlog, | |
2112 | "SC: lwp kill %d %s\n", | |
2113 | ret, | |
2114 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2115 | } | |
2116 | ||
2117 | lp->signalled = 1; | |
2118 | gdb_assert (lp->status == 0); | |
2119 | } | |
2120 | ||
2121 | return 0; | |
2122 | } | |
2123 | ||
57380f4e | 2124 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2125 | |
2126 | static int | |
57380f4e DJ |
2127 | linux_nat_has_pending_sigint (int pid) |
2128 | { | |
2129 | sigset_t pending, blocked, ignored; | |
2130 | int i; | |
2131 | ||
2132 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2133 | ||
2134 | if (sigismember (&pending, SIGINT) | |
2135 | && !sigismember (&ignored, SIGINT)) | |
2136 | return 1; | |
2137 | ||
2138 | return 0; | |
2139 | } | |
2140 | ||
2141 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2142 | ||
2143 | static int | |
2144 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2145 | { |
57380f4e DJ |
2146 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2147 | flag to consume the next one. */ | |
2148 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2149 | && WSTOPSIG (lp->status) == SIGINT) | |
2150 | lp->status = 0; | |
2151 | else | |
2152 | lp->ignore_sigint = 1; | |
2153 | ||
2154 | return 0; | |
2155 | } | |
2156 | ||
2157 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2158 | This function is called after we know the LWP has stopped; if the LWP | |
2159 | stopped before the expected SIGINT was delivered, then it will never have | |
2160 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2161 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2162 | |
57380f4e DJ |
2163 | static void |
2164 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2165 | { | |
2166 | if (!lp->ignore_sigint) | |
2167 | return; | |
2168 | ||
2169 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2170 | { | |
2171 | if (debug_linux_nat) | |
2172 | fprintf_unfiltered (gdb_stdlog, | |
2173 | "MCIS: Clearing bogus flag for %s\n", | |
2174 | target_pid_to_str (lp->ptid)); | |
2175 | lp->ignore_sigint = 0; | |
2176 | } | |
2177 | } | |
2178 | ||
2179 | /* Wait until LP is stopped. */ | |
2180 | ||
2181 | static int | |
2182 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2183 | { | |
d6b0e80f AC |
2184 | if (!lp->stopped) |
2185 | { | |
2186 | int status; | |
2187 | ||
2188 | status = wait_lwp (lp); | |
2189 | if (status == 0) | |
2190 | return 0; | |
2191 | ||
57380f4e DJ |
2192 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2193 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2194 | { |
57380f4e | 2195 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2196 | |
2197 | errno = 0; | |
2198 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2199 | if (debug_linux_nat) | |
2200 | fprintf_unfiltered (gdb_stdlog, | |
57380f4e | 2201 | "PTRACE_CONT %s, 0, 0 (%s) (discarding SIGINT)\n", |
d6b0e80f AC |
2202 | target_pid_to_str (lp->ptid), |
2203 | errno ? safe_strerror (errno) : "OK"); | |
2204 | ||
57380f4e | 2205 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2206 | } |
2207 | ||
57380f4e DJ |
2208 | maybe_clear_ignore_sigint (lp); |
2209 | ||
d6b0e80f AC |
2210 | if (WSTOPSIG (status) != SIGSTOP) |
2211 | { | |
2212 | if (WSTOPSIG (status) == SIGTRAP) | |
2213 | { | |
2214 | /* If a LWP other than the LWP that we're reporting an | |
2215 | event for has hit a GDB breakpoint (as opposed to | |
2216 | some random trap signal), then just arrange for it to | |
2217 | hit it again later. We don't keep the SIGTRAP status | |
2218 | and don't forward the SIGTRAP signal to the LWP. We | |
2219 | will handle the current event, eventually we will | |
2220 | resume all LWPs, and this one will get its breakpoint | |
2221 | trap again. | |
2222 | ||
2223 | If we do not do this, then we run the risk that the | |
2224 | user will delete or disable the breakpoint, but the | |
2225 | thread will have already tripped on it. */ | |
2226 | ||
9f0bdab8 DJ |
2227 | /* Save the trap's siginfo in case we need it later. */ |
2228 | save_siginfo (lp); | |
2229 | ||
d6b0e80f AC |
2230 | /* Now resume this LWP and get the SIGSTOP event. */ |
2231 | errno = 0; | |
2232 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2233 | if (debug_linux_nat) | |
2234 | { | |
2235 | fprintf_unfiltered (gdb_stdlog, | |
2236 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2237 | target_pid_to_str (lp->ptid), | |
2238 | errno ? safe_strerror (errno) : "OK"); | |
2239 | ||
2240 | fprintf_unfiltered (gdb_stdlog, | |
2241 | "SWC: Candidate SIGTRAP event in %s\n", | |
2242 | target_pid_to_str (lp->ptid)); | |
2243 | } | |
710151dd PA |
2244 | /* Hold this event/waitstatus while we check to see if |
2245 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2246 | stop_wait_callback (lp, NULL); |
710151dd PA |
2247 | |
2248 | if (target_can_async_p ()) | |
d6b0e80f | 2249 | { |
710151dd PA |
2250 | /* Don't leave a pending wait status in async mode. |
2251 | Retrigger the breakpoint. */ | |
2252 | if (!cancel_breakpoint (lp)) | |
d6b0e80f | 2253 | { |
710151dd PA |
2254 | /* There was no gdb breakpoint set at pc. Put |
2255 | the event back in the queue. */ | |
2256 | if (debug_linux_nat) | |
252fbfc8 PA |
2257 | fprintf_unfiltered (gdb_stdlog, "\ |
2258 | SWC: leaving SIGTRAP in local queue of %s\n", target_pid_to_str (lp->ptid)); | |
2259 | push_waitpid (GET_LWP (lp->ptid), | |
2260 | W_STOPCODE (SIGTRAP), | |
2261 | lp->cloned ? __WCLONE : 0); | |
710151dd PA |
2262 | } |
2263 | } | |
2264 | else | |
2265 | { | |
2266 | /* Hold the SIGTRAP for handling by | |
2267 | linux_nat_wait. */ | |
2268 | /* If there's another event, throw it back into the | |
2269 | queue. */ | |
2270 | if (lp->status) | |
2271 | { | |
2272 | if (debug_linux_nat) | |
2273 | fprintf_unfiltered (gdb_stdlog, | |
2274 | "SWC: kill %s, %s\n", | |
2275 | target_pid_to_str (lp->ptid), | |
2276 | status_to_str ((int) status)); | |
2277 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2278 | } |
710151dd PA |
2279 | /* Save the sigtrap event. */ |
2280 | lp->status = status; | |
d6b0e80f | 2281 | } |
d6b0e80f AC |
2282 | return 0; |
2283 | } | |
2284 | else | |
2285 | { | |
2286 | /* The thread was stopped with a signal other than | |
2287 | SIGSTOP, and didn't accidentally trip a breakpoint. */ | |
2288 | ||
2289 | if (debug_linux_nat) | |
2290 | { | |
2291 | fprintf_unfiltered (gdb_stdlog, | |
2292 | "SWC: Pending event %s in %s\n", | |
2293 | status_to_str ((int) status), | |
2294 | target_pid_to_str (lp->ptid)); | |
2295 | } | |
2296 | /* Now resume this LWP and get the SIGSTOP event. */ | |
2297 | errno = 0; | |
2298 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2299 | if (debug_linux_nat) | |
2300 | fprintf_unfiltered (gdb_stdlog, | |
2301 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2302 | target_pid_to_str (lp->ptid), | |
2303 | errno ? safe_strerror (errno) : "OK"); | |
2304 | ||
2305 | /* Hold this event/waitstatus while we check to see if | |
2306 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2307 | stop_wait_callback (lp, NULL); |
710151dd PA |
2308 | |
2309 | /* If the lp->status field is still empty, use it to | |
2310 | hold this event. If not, then this event must be | |
2311 | returned to the event queue of the LWP. */ | |
2312 | if (lp->status || target_can_async_p ()) | |
d6b0e80f AC |
2313 | { |
2314 | if (debug_linux_nat) | |
2315 | { | |
2316 | fprintf_unfiltered (gdb_stdlog, | |
2317 | "SWC: kill %s, %s\n", | |
2318 | target_pid_to_str (lp->ptid), | |
2319 | status_to_str ((int) status)); | |
2320 | } | |
2321 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2322 | } | |
710151dd PA |
2323 | else |
2324 | lp->status = status; | |
d6b0e80f AC |
2325 | return 0; |
2326 | } | |
2327 | } | |
2328 | else | |
2329 | { | |
2330 | /* We caught the SIGSTOP that we intended to catch, so | |
2331 | there's no SIGSTOP pending. */ | |
2332 | lp->stopped = 1; | |
2333 | lp->signalled = 0; | |
2334 | } | |
2335 | } | |
2336 | ||
2337 | return 0; | |
2338 | } | |
2339 | ||
d6b0e80f AC |
2340 | /* Return non-zero if LP has a wait status pending. */ |
2341 | ||
2342 | static int | |
2343 | status_callback (struct lwp_info *lp, void *data) | |
2344 | { | |
2345 | /* Only report a pending wait status if we pretend that this has | |
2346 | indeed been resumed. */ | |
2347 | return (lp->status != 0 && lp->resumed); | |
2348 | } | |
2349 | ||
2350 | /* Return non-zero if LP isn't stopped. */ | |
2351 | ||
2352 | static int | |
2353 | running_callback (struct lwp_info *lp, void *data) | |
2354 | { | |
2355 | return (lp->stopped == 0 || (lp->status != 0 && lp->resumed)); | |
2356 | } | |
2357 | ||
2358 | /* Count the LWP's that have had events. */ | |
2359 | ||
2360 | static int | |
2361 | count_events_callback (struct lwp_info *lp, void *data) | |
2362 | { | |
2363 | int *count = data; | |
2364 | ||
2365 | gdb_assert (count != NULL); | |
2366 | ||
e09490f1 DJ |
2367 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
2368 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2369 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2370 | (*count)++; | |
2371 | ||
2372 | return 0; | |
2373 | } | |
2374 | ||
2375 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2376 | ||
2377 | static int | |
2378 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2379 | { | |
2380 | if (lp->step && lp->status != 0) | |
2381 | return 1; | |
2382 | else | |
2383 | return 0; | |
2384 | } | |
2385 | ||
2386 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2387 | ||
2388 | static int | |
2389 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2390 | { | |
2391 | int *selector = data; | |
2392 | ||
2393 | gdb_assert (selector != NULL); | |
2394 | ||
e09490f1 DJ |
2395 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
2396 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2397 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2398 | if ((*selector)-- == 0) | |
2399 | return 1; | |
2400 | ||
2401 | return 0; | |
2402 | } | |
2403 | ||
710151dd PA |
2404 | static int |
2405 | cancel_breakpoint (struct lwp_info *lp) | |
2406 | { | |
2407 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2408 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2409 | LWP. We will handle the current event, eventually we will resume | |
2410 | this LWP, and this breakpoint will trap again. | |
2411 | ||
2412 | If we do not do this, then we run the risk that the user will | |
2413 | delete or disable the breakpoint, but the LWP will have already | |
2414 | tripped on it. */ | |
2415 | ||
515630c5 UW |
2416 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
2417 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2418 | CORE_ADDR pc; | |
2419 | ||
2420 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
2421 | if (breakpoint_inserted_here_p (pc)) | |
710151dd PA |
2422 | { |
2423 | if (debug_linux_nat) | |
2424 | fprintf_unfiltered (gdb_stdlog, | |
2425 | "CB: Push back breakpoint for %s\n", | |
2426 | target_pid_to_str (lp->ptid)); | |
2427 | ||
2428 | /* Back up the PC if necessary. */ | |
515630c5 UW |
2429 | if (gdbarch_decr_pc_after_break (gdbarch)) |
2430 | regcache_write_pc (regcache, pc); | |
2431 | ||
710151dd PA |
2432 | return 1; |
2433 | } | |
2434 | return 0; | |
2435 | } | |
2436 | ||
d6b0e80f AC |
2437 | static int |
2438 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
2439 | { | |
2440 | struct lwp_info *event_lp = data; | |
2441 | ||
2442 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2443 | if (lp == event_lp) | |
2444 | return 0; | |
2445 | ||
2446 | /* If a LWP other than the LWP that we're reporting an event for has | |
2447 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2448 | then just arrange for it to hit it again later. We don't keep | |
2449 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2450 | LWP. We will handle the current event, eventually we will resume | |
2451 | all LWPs, and this one will get its breakpoint trap again. | |
2452 | ||
2453 | If we do not do this, then we run the risk that the user will | |
2454 | delete or disable the breakpoint, but the LWP will have already | |
2455 | tripped on it. */ | |
2456 | ||
2457 | if (lp->status != 0 | |
2458 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP | |
710151dd PA |
2459 | && cancel_breakpoint (lp)) |
2460 | /* Throw away the SIGTRAP. */ | |
2461 | lp->status = 0; | |
d6b0e80f AC |
2462 | |
2463 | return 0; | |
2464 | } | |
2465 | ||
2466 | /* Select one LWP out of those that have events pending. */ | |
2467 | ||
2468 | static void | |
2469 | select_event_lwp (struct lwp_info **orig_lp, int *status) | |
2470 | { | |
2471 | int num_events = 0; | |
2472 | int random_selector; | |
2473 | struct lwp_info *event_lp; | |
2474 | ||
ac264b3b | 2475 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
2476 | (*orig_lp)->status = *status; |
2477 | ||
2478 | /* Give preference to any LWP that is being single-stepped. */ | |
2479 | event_lp = iterate_over_lwps (select_singlestep_lwp_callback, NULL); | |
2480 | if (event_lp != NULL) | |
2481 | { | |
2482 | if (debug_linux_nat) | |
2483 | fprintf_unfiltered (gdb_stdlog, | |
2484 | "SEL: Select single-step %s\n", | |
2485 | target_pid_to_str (event_lp->ptid)); | |
2486 | } | |
2487 | else | |
2488 | { | |
2489 | /* No single-stepping LWP. Select one at random, out of those | |
2490 | which have had SIGTRAP events. */ | |
2491 | ||
2492 | /* First see how many SIGTRAP events we have. */ | |
2493 | iterate_over_lwps (count_events_callback, &num_events); | |
2494 | ||
2495 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2496 | random_selector = (int) | |
2497 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2498 | ||
2499 | if (debug_linux_nat && num_events > 1) | |
2500 | fprintf_unfiltered (gdb_stdlog, | |
2501 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2502 | num_events, random_selector); | |
2503 | ||
2504 | event_lp = iterate_over_lwps (select_event_lwp_callback, | |
2505 | &random_selector); | |
2506 | } | |
2507 | ||
2508 | if (event_lp != NULL) | |
2509 | { | |
2510 | /* Switch the event LWP. */ | |
2511 | *orig_lp = event_lp; | |
2512 | *status = event_lp->status; | |
2513 | } | |
2514 | ||
2515 | /* Flush the wait status for the event LWP. */ | |
2516 | (*orig_lp)->status = 0; | |
2517 | } | |
2518 | ||
2519 | /* Return non-zero if LP has been resumed. */ | |
2520 | ||
2521 | static int | |
2522 | resumed_callback (struct lwp_info *lp, void *data) | |
2523 | { | |
2524 | return lp->resumed; | |
2525 | } | |
2526 | ||
d6b0e80f AC |
2527 | /* Stop an active thread, verify it still exists, then resume it. */ |
2528 | ||
2529 | static int | |
2530 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
2531 | { | |
2532 | struct lwp_info *ptr; | |
2533 | ||
2534 | if (!lp->stopped && !lp->signalled) | |
2535 | { | |
2536 | stop_callback (lp, NULL); | |
2537 | stop_wait_callback (lp, NULL); | |
2538 | /* Resume if the lwp still exists. */ | |
2539 | for (ptr = lwp_list; ptr; ptr = ptr->next) | |
2540 | if (lp == ptr) | |
2541 | { | |
2542 | resume_callback (lp, NULL); | |
2543 | resume_set_callback (lp, NULL); | |
2544 | } | |
2545 | } | |
2546 | return 0; | |
2547 | } | |
2548 | ||
02f3fc28 | 2549 | /* Check if we should go on and pass this event to common code. |
fa2c6a57 | 2550 | Return the affected lwp if we are, or NULL otherwise. */ |
02f3fc28 PA |
2551 | static struct lwp_info * |
2552 | linux_nat_filter_event (int lwpid, int status, int options) | |
2553 | { | |
2554 | struct lwp_info *lp; | |
2555 | ||
2556 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
2557 | ||
2558 | /* Check for stop events reported by a process we didn't already | |
2559 | know about - anything not already in our LWP list. | |
2560 | ||
2561 | If we're expecting to receive stopped processes after | |
2562 | fork, vfork, and clone events, then we'll just add the | |
2563 | new one to our list and go back to waiting for the event | |
2564 | to be reported - the stopped process might be returned | |
2565 | from waitpid before or after the event is. */ | |
2566 | if (WIFSTOPPED (status) && !lp) | |
2567 | { | |
2568 | linux_record_stopped_pid (lwpid, status); | |
2569 | return NULL; | |
2570 | } | |
2571 | ||
2572 | /* Make sure we don't report an event for the exit of an LWP not in | |
2573 | our list, i.e. not part of the current process. This can happen | |
2574 | if we detach from a program we original forked and then it | |
2575 | exits. */ | |
2576 | if (!WIFSTOPPED (status) && !lp) | |
2577 | return NULL; | |
2578 | ||
2579 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
2580 | CLONE_PTRACE processes which do not use the thread library - | |
2581 | otherwise we wouldn't find the new LWP this way. That doesn't | |
2582 | currently work, and the following code is currently unreachable | |
2583 | due to the two blocks above. If it's fixed some day, this code | |
2584 | should be broken out into a function so that we can also pick up | |
2585 | LWPs from the new interface. */ | |
2586 | if (!lp) | |
2587 | { | |
2588 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
2589 | if (options & __WCLONE) | |
2590 | lp->cloned = 1; | |
2591 | ||
2592 | gdb_assert (WIFSTOPPED (status) | |
2593 | && WSTOPSIG (status) == SIGSTOP); | |
2594 | lp->signalled = 1; | |
2595 | ||
2596 | if (!in_thread_list (inferior_ptid)) | |
2597 | { | |
2598 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
2599 | GET_PID (inferior_ptid)); | |
2600 | add_thread (inferior_ptid); | |
2601 | } | |
2602 | ||
2603 | add_thread (lp->ptid); | |
2604 | } | |
2605 | ||
2606 | /* Save the trap's siginfo in case we need it later. */ | |
2607 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) | |
2608 | save_siginfo (lp); | |
2609 | ||
2610 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
2611 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2612 | { | |
2613 | if (debug_linux_nat) | |
2614 | fprintf_unfiltered (gdb_stdlog, | |
2615 | "LLW: Handling extended status 0x%06x\n", | |
2616 | status); | |
2617 | if (linux_handle_extended_wait (lp, status, 0)) | |
2618 | return NULL; | |
2619 | } | |
2620 | ||
2621 | /* Check if the thread has exited. */ | |
2622 | if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1) | |
2623 | { | |
2624 | /* If this is the main thread, we must stop all threads and | |
2625 | verify if they are still alive. This is because in the nptl | |
2626 | thread model, there is no signal issued for exiting LWPs | |
2627 | other than the main thread. We only get the main thread exit | |
2628 | signal once all child threads have already exited. If we | |
2629 | stop all the threads and use the stop_wait_callback to check | |
2630 | if they have exited we can determine whether this signal | |
2631 | should be ignored or whether it means the end of the debugged | |
2632 | application, regardless of which threading model is being | |
2633 | used. */ | |
2634 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) | |
2635 | { | |
2636 | lp->stopped = 1; | |
2637 | iterate_over_lwps (stop_and_resume_callback, NULL); | |
2638 | } | |
2639 | ||
2640 | if (debug_linux_nat) | |
2641 | fprintf_unfiltered (gdb_stdlog, | |
2642 | "LLW: %s exited.\n", | |
2643 | target_pid_to_str (lp->ptid)); | |
2644 | ||
2645 | exit_lwp (lp); | |
2646 | ||
2647 | /* If there is at least one more LWP, then the exit signal was | |
2648 | not the end of the debugged application and should be | |
2649 | ignored. */ | |
2650 | if (num_lwps > 0) | |
4c28f408 | 2651 | return NULL; |
02f3fc28 PA |
2652 | } |
2653 | ||
2654 | /* Check if the current LWP has previously exited. In the nptl | |
2655 | thread model, LWPs other than the main thread do not issue | |
2656 | signals when they exit so we must check whenever the thread has | |
2657 | stopped. A similar check is made in stop_wait_callback(). */ | |
2658 | if (num_lwps > 1 && !linux_nat_thread_alive (lp->ptid)) | |
2659 | { | |
2660 | if (debug_linux_nat) | |
2661 | fprintf_unfiltered (gdb_stdlog, | |
2662 | "LLW: %s exited.\n", | |
2663 | target_pid_to_str (lp->ptid)); | |
2664 | ||
2665 | exit_lwp (lp); | |
2666 | ||
2667 | /* Make sure there is at least one thread running. */ | |
2668 | gdb_assert (iterate_over_lwps (running_callback, NULL)); | |
2669 | ||
2670 | /* Discard the event. */ | |
2671 | return NULL; | |
2672 | } | |
2673 | ||
2674 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
2675 | an attempt to stop an LWP. */ | |
2676 | if (lp->signalled | |
2677 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
2678 | { | |
2679 | if (debug_linux_nat) | |
2680 | fprintf_unfiltered (gdb_stdlog, | |
2681 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
2682 | target_pid_to_str (lp->ptid)); | |
2683 | ||
2684 | /* This is a delayed SIGSTOP. */ | |
2685 | lp->signalled = 0; | |
2686 | ||
2687 | registers_changed (); | |
2688 | ||
2689 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), | |
2690 | lp->step, TARGET_SIGNAL_0); | |
2691 | if (debug_linux_nat) | |
2692 | fprintf_unfiltered (gdb_stdlog, | |
2693 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
2694 | lp->step ? | |
2695 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2696 | target_pid_to_str (lp->ptid)); | |
2697 | ||
2698 | lp->stopped = 0; | |
2699 | gdb_assert (lp->resumed); | |
2700 | ||
2701 | /* Discard the event. */ | |
2702 | return NULL; | |
2703 | } | |
2704 | ||
57380f4e DJ |
2705 | /* Make sure we don't report a SIGINT that we have already displayed |
2706 | for another thread. */ | |
2707 | if (lp->ignore_sigint | |
2708 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
2709 | { | |
2710 | if (debug_linux_nat) | |
2711 | fprintf_unfiltered (gdb_stdlog, | |
2712 | "LLW: Delayed SIGINT caught for %s.\n", | |
2713 | target_pid_to_str (lp->ptid)); | |
2714 | ||
2715 | /* This is a delayed SIGINT. */ | |
2716 | lp->ignore_sigint = 0; | |
2717 | ||
2718 | registers_changed (); | |
2719 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), | |
2720 | lp->step, TARGET_SIGNAL_0); | |
2721 | if (debug_linux_nat) | |
2722 | fprintf_unfiltered (gdb_stdlog, | |
2723 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
2724 | lp->step ? | |
2725 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2726 | target_pid_to_str (lp->ptid)); | |
2727 | ||
2728 | lp->stopped = 0; | |
2729 | gdb_assert (lp->resumed); | |
2730 | ||
2731 | /* Discard the event. */ | |
2732 | return NULL; | |
2733 | } | |
2734 | ||
02f3fc28 PA |
2735 | /* An interesting event. */ |
2736 | gdb_assert (lp); | |
2737 | return lp; | |
2738 | } | |
2739 | ||
b84876c2 PA |
2740 | /* Get the events stored in the pipe into the local queue, so they are |
2741 | accessible to queued_waitpid. We need to do this, since it is not | |
2742 | always the case that the event at the head of the pipe is the event | |
2743 | we want. */ | |
2744 | ||
2745 | static void | |
2746 | pipe_to_local_event_queue (void) | |
2747 | { | |
2748 | if (debug_linux_nat_async) | |
2749 | fprintf_unfiltered (gdb_stdlog, | |
2750 | "PTLEQ: linux_nat_num_queued_events(%d)\n", | |
2751 | linux_nat_num_queued_events); | |
2752 | while (linux_nat_num_queued_events) | |
2753 | { | |
2754 | int lwpid, status, options; | |
b84876c2 | 2755 | lwpid = linux_nat_event_pipe_pop (&status, &options); |
b84876c2 PA |
2756 | gdb_assert (lwpid > 0); |
2757 | push_waitpid (lwpid, status, options); | |
2758 | } | |
2759 | } | |
2760 | ||
2761 | /* Get the unprocessed events stored in the local queue back into the | |
2762 | pipe, so the event loop realizes there's something else to | |
2763 | process. */ | |
2764 | ||
2765 | static void | |
2766 | local_event_queue_to_pipe (void) | |
2767 | { | |
2768 | struct waitpid_result *w = waitpid_queue; | |
2769 | while (w) | |
2770 | { | |
2771 | struct waitpid_result *next = w->next; | |
2772 | linux_nat_event_pipe_push (w->pid, | |
2773 | w->status, | |
2774 | w->options); | |
2775 | xfree (w); | |
2776 | w = next; | |
2777 | } | |
2778 | waitpid_queue = NULL; | |
2779 | ||
2780 | if (debug_linux_nat_async) | |
2781 | fprintf_unfiltered (gdb_stdlog, | |
2782 | "LEQTP: linux_nat_num_queued_events(%d)\n", | |
2783 | linux_nat_num_queued_events); | |
2784 | } | |
2785 | ||
d6b0e80f | 2786 | static ptid_t |
117de6a9 PA |
2787 | linux_nat_wait (struct target_ops *ops, |
2788 | ptid_t ptid, struct target_waitstatus *ourstatus) | |
d6b0e80f AC |
2789 | { |
2790 | struct lwp_info *lp = NULL; | |
2791 | int options = 0; | |
2792 | int status = 0; | |
2793 | pid_t pid = PIDGET (ptid); | |
d6b0e80f | 2794 | |
b84876c2 PA |
2795 | if (debug_linux_nat_async) |
2796 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); | |
2797 | ||
f973ed9c DJ |
2798 | /* The first time we get here after starting a new inferior, we may |
2799 | not have added it to the LWP list yet - this is the earliest | |
2800 | moment at which we know its PID. */ | |
2801 | if (num_lwps == 0) | |
2802 | { | |
2803 | gdb_assert (!is_lwp (inferior_ptid)); | |
2804 | ||
27c9d204 PA |
2805 | /* Upgrade the main thread's ptid. */ |
2806 | thread_change_ptid (inferior_ptid, | |
2807 | BUILD_LWP (GET_PID (inferior_ptid), | |
2808 | GET_PID (inferior_ptid))); | |
2809 | ||
f973ed9c DJ |
2810 | lp = add_lwp (inferior_ptid); |
2811 | lp->resumed = 1; | |
2812 | } | |
2813 | ||
84e46146 PA |
2814 | /* Block events while we're here. */ |
2815 | linux_nat_async_events (sigchld_sync); | |
d6b0e80f AC |
2816 | |
2817 | retry: | |
2818 | ||
f973ed9c DJ |
2819 | /* Make sure there is at least one LWP that has been resumed. */ |
2820 | gdb_assert (iterate_over_lwps (resumed_callback, NULL)); | |
d6b0e80f AC |
2821 | |
2822 | /* First check if there is a LWP with a wait status pending. */ | |
2823 | if (pid == -1) | |
2824 | { | |
2825 | /* Any LWP that's been resumed will do. */ | |
2826 | lp = iterate_over_lwps (status_callback, NULL); | |
2827 | if (lp) | |
2828 | { | |
710151dd PA |
2829 | if (target_can_async_p ()) |
2830 | internal_error (__FILE__, __LINE__, | |
2831 | "Found an LWP with a pending status in async mode."); | |
2832 | ||
d6b0e80f AC |
2833 | status = lp->status; |
2834 | lp->status = 0; | |
2835 | ||
2836 | if (debug_linux_nat && status) | |
2837 | fprintf_unfiltered (gdb_stdlog, | |
2838 | "LLW: Using pending wait status %s for %s.\n", | |
2839 | status_to_str (status), | |
2840 | target_pid_to_str (lp->ptid)); | |
2841 | } | |
2842 | ||
b84876c2 | 2843 | /* But if we don't find one, we'll have to wait, and check both |
d6b0e80f AC |
2844 | cloned and uncloned processes. We start with the cloned |
2845 | processes. */ | |
2846 | options = __WCLONE | WNOHANG; | |
2847 | } | |
2848 | else if (is_lwp (ptid)) | |
2849 | { | |
2850 | if (debug_linux_nat) | |
2851 | fprintf_unfiltered (gdb_stdlog, | |
2852 | "LLW: Waiting for specific LWP %s.\n", | |
2853 | target_pid_to_str (ptid)); | |
2854 | ||
2855 | /* We have a specific LWP to check. */ | |
2856 | lp = find_lwp_pid (ptid); | |
2857 | gdb_assert (lp); | |
2858 | status = lp->status; | |
2859 | lp->status = 0; | |
2860 | ||
2861 | if (debug_linux_nat && status) | |
2862 | fprintf_unfiltered (gdb_stdlog, | |
2863 | "LLW: Using pending wait status %s for %s.\n", | |
2864 | status_to_str (status), | |
2865 | target_pid_to_str (lp->ptid)); | |
2866 | ||
2867 | /* If we have to wait, take into account whether PID is a cloned | |
2868 | process or not. And we have to convert it to something that | |
2869 | the layer beneath us can understand. */ | |
2870 | options = lp->cloned ? __WCLONE : 0; | |
2871 | pid = GET_LWP (ptid); | |
2872 | } | |
2873 | ||
2874 | if (status && lp->signalled) | |
2875 | { | |
2876 | /* A pending SIGSTOP may interfere with the normal stream of | |
2877 | events. In a typical case where interference is a problem, | |
2878 | we have a SIGSTOP signal pending for LWP A while | |
2879 | single-stepping it, encounter an event in LWP B, and take the | |
2880 | pending SIGSTOP while trying to stop LWP A. After processing | |
2881 | the event in LWP B, LWP A is continued, and we'll never see | |
2882 | the SIGTRAP associated with the last time we were | |
2883 | single-stepping LWP A. */ | |
2884 | ||
2885 | /* Resume the thread. It should halt immediately returning the | |
2886 | pending SIGSTOP. */ | |
2887 | registers_changed (); | |
10d6c8cd DJ |
2888 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), |
2889 | lp->step, TARGET_SIGNAL_0); | |
d6b0e80f AC |
2890 | if (debug_linux_nat) |
2891 | fprintf_unfiltered (gdb_stdlog, | |
2892 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
2893 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2894 | target_pid_to_str (lp->ptid)); | |
2895 | lp->stopped = 0; | |
2896 | gdb_assert (lp->resumed); | |
2897 | ||
2898 | /* This should catch the pending SIGSTOP. */ | |
2899 | stop_wait_callback (lp, NULL); | |
2900 | } | |
2901 | ||
b84876c2 PA |
2902 | if (!target_can_async_p ()) |
2903 | { | |
2904 | /* Causes SIGINT to be passed on to the attached process. */ | |
2905 | set_sigint_trap (); | |
b84876c2 | 2906 | } |
d6b0e80f AC |
2907 | |
2908 | while (status == 0) | |
2909 | { | |
2910 | pid_t lwpid; | |
2911 | ||
b84876c2 PA |
2912 | if (target_can_async_p ()) |
2913 | /* In async mode, don't ever block. Only look at the locally | |
2914 | queued events. */ | |
2915 | lwpid = queued_waitpid (pid, &status, options); | |
2916 | else | |
2917 | lwpid = my_waitpid (pid, &status, options); | |
2918 | ||
d6b0e80f AC |
2919 | if (lwpid > 0) |
2920 | { | |
2921 | gdb_assert (pid == -1 || lwpid == pid); | |
2922 | ||
2923 | if (debug_linux_nat) | |
2924 | { | |
2925 | fprintf_unfiltered (gdb_stdlog, | |
2926 | "LLW: waitpid %ld received %s\n", | |
2927 | (long) lwpid, status_to_str (status)); | |
2928 | } | |
2929 | ||
02f3fc28 | 2930 | lp = linux_nat_filter_event (lwpid, status, options); |
d6b0e80f AC |
2931 | if (!lp) |
2932 | { | |
02f3fc28 | 2933 | /* A discarded event. */ |
d6b0e80f AC |
2934 | status = 0; |
2935 | continue; | |
2936 | } | |
2937 | ||
2938 | break; | |
2939 | } | |
2940 | ||
2941 | if (pid == -1) | |
2942 | { | |
2943 | /* Alternate between checking cloned and uncloned processes. */ | |
2944 | options ^= __WCLONE; | |
2945 | ||
b84876c2 PA |
2946 | /* And every time we have checked both: |
2947 | In async mode, return to event loop; | |
2948 | In sync mode, suspend waiting for a SIGCHLD signal. */ | |
d6b0e80f | 2949 | if (options & __WCLONE) |
b84876c2 PA |
2950 | { |
2951 | if (target_can_async_p ()) | |
2952 | { | |
2953 | /* No interesting event. */ | |
2954 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2955 | ||
2956 | /* Get ready for the next event. */ | |
2957 | target_async (inferior_event_handler, 0); | |
2958 | ||
2959 | if (debug_linux_nat_async) | |
2960 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
2961 | ||
2962 | return minus_one_ptid; | |
2963 | } | |
2964 | ||
2965 | sigsuspend (&suspend_mask); | |
2966 | } | |
d6b0e80f AC |
2967 | } |
2968 | ||
2969 | /* We shouldn't end up here unless we want to try again. */ | |
2970 | gdb_assert (status == 0); | |
2971 | } | |
2972 | ||
b84876c2 | 2973 | if (!target_can_async_p ()) |
d26b5354 | 2974 | clear_sigint_trap (); |
d6b0e80f AC |
2975 | |
2976 | gdb_assert (lp); | |
2977 | ||
2978 | /* Don't report signals that GDB isn't interested in, such as | |
2979 | signals that are neither printed nor stopped upon. Stopping all | |
2980 | threads can be a bit time-consuming so if we want decent | |
2981 | performance with heavily multi-threaded programs, especially when | |
2982 | they're using a high frequency timer, we'd better avoid it if we | |
2983 | can. */ | |
2984 | ||
2985 | if (WIFSTOPPED (status)) | |
2986 | { | |
2987 | int signo = target_signal_from_host (WSTOPSIG (status)); | |
d6b48e9c PA |
2988 | struct inferior *inf; |
2989 | ||
2990 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
2991 | gdb_assert (inf); | |
d6b0e80f | 2992 | |
d6b48e9c PA |
2993 | /* Defer to common code if we get a signal while |
2994 | single-stepping, since that may need special care, e.g. to | |
2995 | skip the signal handler, or, if we're gaining control of the | |
2996 | inferior. */ | |
d539ed7e | 2997 | if (!lp->step |
d6b48e9c | 2998 | && inf->stop_soon == NO_STOP_QUIETLY |
d539ed7e | 2999 | && signal_stop_state (signo) == 0 |
d6b0e80f AC |
3000 | && signal_print_state (signo) == 0 |
3001 | && signal_pass_state (signo) == 1) | |
3002 | { | |
3003 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
3004 | here? It is not clear we should. GDB may not expect | |
3005 | other threads to run. On the other hand, not resuming | |
3006 | newly attached threads may cause an unwanted delay in | |
3007 | getting them running. */ | |
3008 | registers_changed (); | |
10d6c8cd DJ |
3009 | linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)), |
3010 | lp->step, signo); | |
d6b0e80f AC |
3011 | if (debug_linux_nat) |
3012 | fprintf_unfiltered (gdb_stdlog, | |
3013 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3014 | lp->step ? | |
3015 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3016 | target_pid_to_str (lp->ptid), | |
3017 | signo ? strsignal (signo) : "0"); | |
3018 | lp->stopped = 0; | |
3019 | status = 0; | |
3020 | goto retry; | |
3021 | } | |
3022 | ||
1ad15515 | 3023 | if (!non_stop) |
d6b0e80f | 3024 | { |
1ad15515 PA |
3025 | /* Only do the below in all-stop, as we currently use SIGINT |
3026 | to implement target_stop (see linux_nat_stop) in | |
3027 | non-stop. */ | |
3028 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3029 | { | |
3030 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3031 | forwarded to the entire process group, that is, all LWPs | |
3032 | will receive it - unless they're using CLONE_THREAD to | |
3033 | share signals. Since we only want to report it once, we | |
3034 | mark it as ignored for all LWPs except this one. */ | |
3035 | iterate_over_lwps (set_ignore_sigint, NULL); | |
3036 | lp->ignore_sigint = 0; | |
3037 | } | |
3038 | else | |
3039 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
3040 | } |
3041 | } | |
3042 | ||
3043 | /* This LWP is stopped now. */ | |
3044 | lp->stopped = 1; | |
3045 | ||
3046 | if (debug_linux_nat) | |
3047 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
3048 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
3049 | ||
4c28f408 PA |
3050 | if (!non_stop) |
3051 | { | |
3052 | /* Now stop all other LWP's ... */ | |
3053 | iterate_over_lwps (stop_callback, NULL); | |
3054 | ||
3055 | /* ... and wait until all of them have reported back that | |
3056 | they're no longer running. */ | |
57380f4e | 3057 | iterate_over_lwps (stop_wait_callback, NULL); |
4c28f408 PA |
3058 | |
3059 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3060 | from among those that have had events. Giving equal priority | |
3061 | to all LWPs that have had events helps prevent | |
3062 | starvation. */ | |
3063 | if (pid == -1) | |
3064 | select_event_lwp (&lp, &status); | |
3065 | } | |
d6b0e80f AC |
3066 | |
3067 | /* Now that we've selected our final event LWP, cancel any | |
3068 | breakpoints in other LWPs that have hit a GDB breakpoint. See | |
3069 | the comment in cancel_breakpoints_callback to find out why. */ | |
3070 | iterate_over_lwps (cancel_breakpoints_callback, lp); | |
3071 | ||
d6b0e80f AC |
3072 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) |
3073 | { | |
d6b0e80f AC |
3074 | if (debug_linux_nat) |
3075 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3076 | "LLW: trap ptid is %s.\n", |
3077 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3078 | } |
d6b0e80f AC |
3079 | |
3080 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3081 | { | |
3082 | *ourstatus = lp->waitstatus; | |
3083 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3084 | } | |
3085 | else | |
3086 | store_waitstatus (ourstatus, status); | |
3087 | ||
b84876c2 PA |
3088 | /* Get ready for the next event. */ |
3089 | if (target_can_async_p ()) | |
3090 | target_async (inferior_event_handler, 0); | |
3091 | ||
3092 | if (debug_linux_nat_async) | |
3093 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); | |
3094 | ||
f973ed9c | 3095 | return lp->ptid; |
d6b0e80f AC |
3096 | } |
3097 | ||
3098 | static int | |
3099 | kill_callback (struct lwp_info *lp, void *data) | |
3100 | { | |
3101 | errno = 0; | |
3102 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
3103 | if (debug_linux_nat) | |
3104 | fprintf_unfiltered (gdb_stdlog, | |
3105 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
3106 | target_pid_to_str (lp->ptid), | |
3107 | errno ? safe_strerror (errno) : "OK"); | |
3108 | ||
3109 | return 0; | |
3110 | } | |
3111 | ||
3112 | static int | |
3113 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3114 | { | |
3115 | pid_t pid; | |
3116 | ||
3117 | /* We must make sure that there are no pending events (delayed | |
3118 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3119 | program doesn't interfere with any following debugging session. */ | |
3120 | ||
3121 | /* For cloned processes we must check both with __WCLONE and | |
3122 | without, since the exit status of a cloned process isn't reported | |
3123 | with __WCLONE. */ | |
3124 | if (lp->cloned) | |
3125 | { | |
3126 | do | |
3127 | { | |
58aecb61 | 3128 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 3129 | if (pid != (pid_t) -1) |
d6b0e80f | 3130 | { |
e85a822c DJ |
3131 | if (debug_linux_nat) |
3132 | fprintf_unfiltered (gdb_stdlog, | |
3133 | "KWC: wait %s received unknown.\n", | |
3134 | target_pid_to_str (lp->ptid)); | |
3135 | /* The Linux kernel sometimes fails to kill a thread | |
3136 | completely after PTRACE_KILL; that goes from the stop | |
3137 | point in do_fork out to the one in | |
3138 | get_signal_to_deliever and waits again. So kill it | |
3139 | again. */ | |
3140 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3141 | } |
3142 | } | |
3143 | while (pid == GET_LWP (lp->ptid)); | |
3144 | ||
3145 | gdb_assert (pid == -1 && errno == ECHILD); | |
3146 | } | |
3147 | ||
3148 | do | |
3149 | { | |
58aecb61 | 3150 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 3151 | if (pid != (pid_t) -1) |
d6b0e80f | 3152 | { |
e85a822c DJ |
3153 | if (debug_linux_nat) |
3154 | fprintf_unfiltered (gdb_stdlog, | |
3155 | "KWC: wait %s received unk.\n", | |
3156 | target_pid_to_str (lp->ptid)); | |
3157 | /* See the call to kill_callback above. */ | |
3158 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3159 | } |
3160 | } | |
3161 | while (pid == GET_LWP (lp->ptid)); | |
3162 | ||
3163 | gdb_assert (pid == -1 && errno == ECHILD); | |
3164 | return 0; | |
3165 | } | |
3166 | ||
3167 | static void | |
3168 | linux_nat_kill (void) | |
3169 | { | |
f973ed9c DJ |
3170 | struct target_waitstatus last; |
3171 | ptid_t last_ptid; | |
3172 | int status; | |
d6b0e80f | 3173 | |
b84876c2 PA |
3174 | if (target_can_async_p ()) |
3175 | target_async (NULL, 0); | |
3176 | ||
f973ed9c DJ |
3177 | /* If we're stopped while forking and we haven't followed yet, |
3178 | kill the other task. We need to do this first because the | |
3179 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 3180 | |
f973ed9c | 3181 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 3182 | |
f973ed9c DJ |
3183 | if (last.kind == TARGET_WAITKIND_FORKED |
3184 | || last.kind == TARGET_WAITKIND_VFORKED) | |
3185 | { | |
3a3e9ee3 | 3186 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
3187 | wait (&status); |
3188 | } | |
3189 | ||
3190 | if (forks_exist_p ()) | |
b84876c2 PA |
3191 | { |
3192 | linux_fork_killall (); | |
3193 | drain_queued_events (-1); | |
3194 | } | |
f973ed9c DJ |
3195 | else |
3196 | { | |
4c28f408 PA |
3197 | /* Stop all threads before killing them, since ptrace requires |
3198 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
3199 | iterate_over_lwps (stop_callback, NULL); | |
3200 | /* ... and wait until all of them have reported back that | |
3201 | they're no longer running. */ | |
3202 | iterate_over_lwps (stop_wait_callback, NULL); | |
3203 | ||
f973ed9c DJ |
3204 | /* Kill all LWP's ... */ |
3205 | iterate_over_lwps (kill_callback, NULL); | |
3206 | ||
3207 | /* ... and wait until we've flushed all events. */ | |
3208 | iterate_over_lwps (kill_wait_callback, NULL); | |
3209 | } | |
3210 | ||
3211 | target_mourn_inferior (); | |
d6b0e80f AC |
3212 | } |
3213 | ||
3214 | static void | |
136d6dae | 3215 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 3216 | { |
d6b0e80f AC |
3217 | /* Destroy LWP info; it's no longer valid. */ |
3218 | init_lwp_list (); | |
3219 | ||
f973ed9c | 3220 | if (! forks_exist_p ()) |
b84876c2 PA |
3221 | { |
3222 | /* Normal case, no other forks available. */ | |
3223 | if (target_can_async_p ()) | |
3224 | linux_nat_async (NULL, 0); | |
136d6dae | 3225 | linux_ops->to_mourn_inferior (ops); |
b84876c2 | 3226 | } |
f973ed9c DJ |
3227 | else |
3228 | /* Multi-fork case. The current inferior_ptid has exited, but | |
3229 | there are other viable forks to debug. Delete the exiting | |
3230 | one and context-switch to the first available. */ | |
3231 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
3232 | } |
3233 | ||
5b009018 PA |
3234 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3235 | layout of the inferiors' architecture. */ | |
3236 | ||
3237 | static void | |
3238 | siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction) | |
3239 | { | |
3240 | int done = 0; | |
3241 | ||
3242 | if (linux_nat_siginfo_fixup != NULL) | |
3243 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
3244 | ||
3245 | /* If there was no callback, or the callback didn't do anything, | |
3246 | then just do a straight memcpy. */ | |
3247 | if (!done) | |
3248 | { | |
3249 | if (direction == 1) | |
3250 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
3251 | else | |
3252 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
3253 | } | |
3254 | } | |
3255 | ||
4aa995e1 PA |
3256 | static LONGEST |
3257 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, | |
3258 | const char *annex, gdb_byte *readbuf, | |
3259 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
3260 | { | |
3261 | struct lwp_info *lp; | |
3262 | LONGEST n; | |
3263 | int pid; | |
3264 | struct siginfo siginfo; | |
5b009018 | 3265 | gdb_byte inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
3266 | |
3267 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
3268 | gdb_assert (readbuf || writebuf); | |
3269 | ||
3270 | pid = GET_LWP (inferior_ptid); | |
3271 | if (pid == 0) | |
3272 | pid = GET_PID (inferior_ptid); | |
3273 | ||
3274 | if (offset > sizeof (siginfo)) | |
3275 | return -1; | |
3276 | ||
3277 | errno = 0; | |
3278 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3279 | if (errno != 0) | |
3280 | return -1; | |
3281 | ||
5b009018 PA |
3282 | /* When GDB is built as a 64-bit application, ptrace writes into |
3283 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3284 | inferior with a 64-bit GDB should look the same as debugging it | |
3285 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
3286 | the converted layout, so any read/write will have to be done | |
3287 | post-conversion. */ | |
3288 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3289 | ||
4aa995e1 PA |
3290 | if (offset + len > sizeof (siginfo)) |
3291 | len = sizeof (siginfo) - offset; | |
3292 | ||
3293 | if (readbuf != NULL) | |
5b009018 | 3294 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3295 | else |
3296 | { | |
5b009018 PA |
3297 | memcpy (inf_siginfo + offset, writebuf, len); |
3298 | ||
3299 | /* Convert back to ptrace layout before flushing it out. */ | |
3300 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3301 | ||
4aa995e1 PA |
3302 | errno = 0; |
3303 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3304 | if (errno != 0) | |
3305 | return -1; | |
3306 | } | |
3307 | ||
3308 | return len; | |
3309 | } | |
3310 | ||
10d6c8cd DJ |
3311 | static LONGEST |
3312 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
3313 | const char *annex, gdb_byte *readbuf, | |
3314 | const gdb_byte *writebuf, | |
3315 | ULONGEST offset, LONGEST len) | |
d6b0e80f | 3316 | { |
4aa995e1 | 3317 | struct cleanup *old_chain; |
10d6c8cd | 3318 | LONGEST xfer; |
d6b0e80f | 3319 | |
4aa995e1 PA |
3320 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
3321 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
3322 | offset, len); | |
3323 | ||
3324 | old_chain = save_inferior_ptid (); | |
3325 | ||
d6b0e80f AC |
3326 | if (is_lwp (inferior_ptid)) |
3327 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
3328 | ||
10d6c8cd DJ |
3329 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
3330 | offset, len); | |
d6b0e80f AC |
3331 | |
3332 | do_cleanups (old_chain); | |
3333 | return xfer; | |
3334 | } | |
3335 | ||
3336 | static int | |
3337 | linux_nat_thread_alive (ptid_t ptid) | |
3338 | { | |
4c28f408 PA |
3339 | int err; |
3340 | ||
d6b0e80f AC |
3341 | gdb_assert (is_lwp (ptid)); |
3342 | ||
4c28f408 PA |
3343 | /* Send signal 0 instead of anything ptrace, because ptracing a |
3344 | running thread errors out claiming that the thread doesn't | |
3345 | exist. */ | |
3346 | err = kill_lwp (GET_LWP (ptid), 0); | |
3347 | ||
d6b0e80f AC |
3348 | if (debug_linux_nat) |
3349 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 3350 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 3351 | target_pid_to_str (ptid), |
4c28f408 | 3352 | err ? safe_strerror (err) : "OK"); |
9c0dd46b | 3353 | |
4c28f408 | 3354 | if (err != 0) |
d6b0e80f AC |
3355 | return 0; |
3356 | ||
3357 | return 1; | |
3358 | } | |
3359 | ||
3360 | static char * | |
117de6a9 | 3361 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
3362 | { |
3363 | static char buf[64]; | |
3364 | ||
a0ef4274 DJ |
3365 | if (is_lwp (ptid) |
3366 | && ((lwp_list && lwp_list->next) | |
3367 | || GET_PID (ptid) != GET_LWP (ptid))) | |
d6b0e80f AC |
3368 | { |
3369 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
3370 | return buf; | |
3371 | } | |
3372 | ||
3373 | return normal_pid_to_str (ptid); | |
3374 | } | |
3375 | ||
d6b0e80f AC |
3376 | static void |
3377 | sigchld_handler (int signo) | |
3378 | { | |
c6ebd6cf | 3379 | if (target_async_permitted |
84e46146 | 3380 | && linux_nat_async_events_state != sigchld_sync |
b84876c2 PA |
3381 | && signo == SIGCHLD) |
3382 | /* It is *always* a bug to hit this. */ | |
3383 | internal_error (__FILE__, __LINE__, | |
3384 | "sigchld_handler called when async events are enabled"); | |
3385 | ||
d6b0e80f AC |
3386 | /* Do nothing. The only reason for this handler is that it allows |
3387 | us to use sigsuspend in linux_nat_wait above to wait for the | |
3388 | arrival of a SIGCHLD. */ | |
3389 | } | |
3390 | ||
dba24537 AC |
3391 | /* Accepts an integer PID; Returns a string representing a file that |
3392 | can be opened to get the symbols for the child process. */ | |
3393 | ||
6d8fd2b7 UW |
3394 | static char * |
3395 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
3396 | { |
3397 | char *name1, *name2; | |
3398 | ||
3399 | name1 = xmalloc (MAXPATHLEN); | |
3400 | name2 = xmalloc (MAXPATHLEN); | |
3401 | make_cleanup (xfree, name1); | |
3402 | make_cleanup (xfree, name2); | |
3403 | memset (name2, 0, MAXPATHLEN); | |
3404 | ||
3405 | sprintf (name1, "/proc/%d/exe", pid); | |
3406 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
3407 | return name2; | |
3408 | else | |
3409 | return name1; | |
3410 | } | |
3411 | ||
3412 | /* Service function for corefiles and info proc. */ | |
3413 | ||
3414 | static int | |
3415 | read_mapping (FILE *mapfile, | |
3416 | long long *addr, | |
3417 | long long *endaddr, | |
3418 | char *permissions, | |
3419 | long long *offset, | |
3420 | char *device, long long *inode, char *filename) | |
3421 | { | |
3422 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
3423 | addr, endaddr, permissions, offset, device, inode); | |
3424 | ||
2e14c2ea MS |
3425 | filename[0] = '\0'; |
3426 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
3427 | { |
3428 | /* Eat everything up to EOL for the filename. This will prevent | |
3429 | weird filenames (such as one with embedded whitespace) from | |
3430 | confusing this code. It also makes this code more robust in | |
3431 | respect to annotations the kernel may add after the filename. | |
3432 | ||
3433 | Note the filename is used for informational purposes | |
3434 | only. */ | |
3435 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
3436 | } | |
2e14c2ea | 3437 | |
dba24537 AC |
3438 | return (ret != 0 && ret != EOF); |
3439 | } | |
3440 | ||
3441 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
3442 | regions in the inferior for a corefile. */ | |
3443 | ||
3444 | static int | |
3445 | linux_nat_find_memory_regions (int (*func) (CORE_ADDR, | |
3446 | unsigned long, | |
3447 | int, int, int, void *), void *obfd) | |
3448 | { | |
3449 | long long pid = PIDGET (inferior_ptid); | |
3450 | char mapsfilename[MAXPATHLEN]; | |
3451 | FILE *mapsfile; | |
3452 | long long addr, endaddr, size, offset, inode; | |
3453 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
3454 | int read, write, exec; | |
3455 | int ret; | |
7c8a8b04 | 3456 | struct cleanup *cleanup; |
dba24537 AC |
3457 | |
3458 | /* Compose the filename for the /proc memory map, and open it. */ | |
3459 | sprintf (mapsfilename, "/proc/%lld/maps", pid); | |
3460 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) | |
8a3fe4f8 | 3461 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 3462 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
3463 | |
3464 | if (info_verbose) | |
3465 | fprintf_filtered (gdb_stdout, | |
3466 | "Reading memory regions from %s\n", mapsfilename); | |
3467 | ||
3468 | /* Now iterate until end-of-file. */ | |
3469 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
3470 | &offset, &device[0], &inode, &filename[0])) | |
3471 | { | |
3472 | size = endaddr - addr; | |
3473 | ||
3474 | /* Get the segment's permissions. */ | |
3475 | read = (strchr (permissions, 'r') != 0); | |
3476 | write = (strchr (permissions, 'w') != 0); | |
3477 | exec = (strchr (permissions, 'x') != 0); | |
3478 | ||
3479 | if (info_verbose) | |
3480 | { | |
3481 | fprintf_filtered (gdb_stdout, | |
3482 | "Save segment, %lld bytes at 0x%s (%c%c%c)", | |
3483 | size, paddr_nz (addr), | |
3484 | read ? 'r' : ' ', | |
3485 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 3486 | if (filename[0]) |
dba24537 AC |
3487 | fprintf_filtered (gdb_stdout, " for %s", filename); |
3488 | fprintf_filtered (gdb_stdout, "\n"); | |
3489 | } | |
3490 | ||
3491 | /* Invoke the callback function to create the corefile | |
3492 | segment. */ | |
3493 | func (addr, size, read, write, exec, obfd); | |
3494 | } | |
7c8a8b04 | 3495 | do_cleanups (cleanup); |
dba24537 AC |
3496 | return 0; |
3497 | } | |
3498 | ||
2020b7ab PA |
3499 | static int |
3500 | find_signalled_thread (struct thread_info *info, void *data) | |
3501 | { | |
3502 | if (info->stop_signal != TARGET_SIGNAL_0 | |
3503 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) | |
3504 | return 1; | |
3505 | ||
3506 | return 0; | |
3507 | } | |
3508 | ||
3509 | static enum target_signal | |
3510 | find_stop_signal (void) | |
3511 | { | |
3512 | struct thread_info *info = | |
3513 | iterate_over_threads (find_signalled_thread, NULL); | |
3514 | ||
3515 | if (info) | |
3516 | return info->stop_signal; | |
3517 | else | |
3518 | return TARGET_SIGNAL_0; | |
3519 | } | |
3520 | ||
dba24537 AC |
3521 | /* Records the thread's register state for the corefile note |
3522 | section. */ | |
3523 | ||
3524 | static char * | |
3525 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
3526 | char *note_data, int *note_size, |
3527 | enum target_signal stop_signal) | |
dba24537 AC |
3528 | { |
3529 | gdb_gregset_t gregs; | |
3530 | gdb_fpregset_t fpregs; | |
dba24537 | 3531 | unsigned long lwp = ptid_get_lwp (ptid); |
594f7785 UW |
3532 | struct regcache *regcache = get_thread_regcache (ptid); |
3533 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4f844a66 | 3534 | const struct regset *regset; |
55e969c1 | 3535 | int core_regset_p; |
594f7785 | 3536 | struct cleanup *old_chain; |
17ea7499 CES |
3537 | struct core_regset_section *sect_list; |
3538 | char *gdb_regset; | |
594f7785 UW |
3539 | |
3540 | old_chain = save_inferior_ptid (); | |
3541 | inferior_ptid = ptid; | |
3542 | target_fetch_registers (regcache, -1); | |
3543 | do_cleanups (old_chain); | |
4f844a66 DM |
3544 | |
3545 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
3546 | sect_list = gdbarch_core_regset_sections (gdbarch); |
3547 | ||
55e969c1 DM |
3548 | if (core_regset_p |
3549 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
3550 | sizeof (gregs))) != NULL | |
3551 | && regset->collect_regset != NULL) | |
594f7785 | 3552 | regset->collect_regset (regset, regcache, -1, |
55e969c1 | 3553 | &gregs, sizeof (gregs)); |
4f844a66 | 3554 | else |
594f7785 | 3555 | fill_gregset (regcache, &gregs, -1); |
4f844a66 | 3556 | |
55e969c1 DM |
3557 | note_data = (char *) elfcore_write_prstatus (obfd, |
3558 | note_data, | |
3559 | note_size, | |
3560 | lwp, | |
3561 | stop_signal, &gregs); | |
3562 | ||
17ea7499 CES |
3563 | /* The loop below uses the new struct core_regset_section, which stores |
3564 | the supported section names and sizes for the core file. Note that | |
3565 | note PRSTATUS needs to be treated specially. But the other notes are | |
3566 | structurally the same, so they can benefit from the new struct. */ | |
3567 | if (core_regset_p && sect_list != NULL) | |
3568 | while (sect_list->sect_name != NULL) | |
3569 | { | |
3570 | /* .reg was already handled above. */ | |
3571 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
3572 | { | |
3573 | sect_list++; | |
3574 | continue; | |
3575 | } | |
3576 | regset = gdbarch_regset_from_core_section (gdbarch, | |
3577 | sect_list->sect_name, | |
3578 | sect_list->size); | |
3579 | gdb_assert (regset && regset->collect_regset); | |
3580 | gdb_regset = xmalloc (sect_list->size); | |
3581 | regset->collect_regset (regset, regcache, -1, | |
3582 | gdb_regset, sect_list->size); | |
3583 | note_data = (char *) elfcore_write_register_note (obfd, | |
3584 | note_data, | |
3585 | note_size, | |
3586 | sect_list->sect_name, | |
3587 | gdb_regset, | |
3588 | sect_list->size); | |
3589 | xfree (gdb_regset); | |
3590 | sect_list++; | |
3591 | } | |
dba24537 | 3592 | |
17ea7499 CES |
3593 | /* For architectures that does not have the struct core_regset_section |
3594 | implemented, we use the old method. When all the architectures have | |
3595 | the new support, the code below should be deleted. */ | |
4f844a66 | 3596 | else |
17ea7499 CES |
3597 | { |
3598 | if (core_regset_p | |
3599 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
3600 | sizeof (fpregs))) != NULL | |
3601 | && regset->collect_regset != NULL) | |
3602 | regset->collect_regset (regset, regcache, -1, | |
3603 | &fpregs, sizeof (fpregs)); | |
3604 | else | |
3605 | fill_fpregset (regcache, &fpregs, -1); | |
3606 | ||
3607 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
3608 | note_data, | |
3609 | note_size, | |
3610 | &fpregs, sizeof (fpregs)); | |
3611 | } | |
4f844a66 | 3612 | |
dba24537 AC |
3613 | return note_data; |
3614 | } | |
3615 | ||
3616 | struct linux_nat_corefile_thread_data | |
3617 | { | |
3618 | bfd *obfd; | |
3619 | char *note_data; | |
3620 | int *note_size; | |
3621 | int num_notes; | |
2020b7ab | 3622 | enum target_signal stop_signal; |
dba24537 AC |
3623 | }; |
3624 | ||
3625 | /* Called by gdbthread.c once per thread. Records the thread's | |
3626 | register state for the corefile note section. */ | |
3627 | ||
3628 | static int | |
3629 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
3630 | { | |
3631 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 3632 | |
dba24537 AC |
3633 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
3634 | ti->ptid, | |
3635 | args->note_data, | |
2020b7ab PA |
3636 | args->note_size, |
3637 | args->stop_signal); | |
dba24537 | 3638 | args->num_notes++; |
56be3814 | 3639 | |
dba24537 AC |
3640 | return 0; |
3641 | } | |
3642 | ||
dba24537 AC |
3643 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
3644 | section for a corefile, and returns it in a malloc buffer. */ | |
3645 | ||
3646 | static char * | |
3647 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
3648 | { | |
3649 | struct linux_nat_corefile_thread_data thread_args; | |
3650 | struct cleanup *old_chain; | |
d99148ef | 3651 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 3652 | char fname[16] = { '\0' }; |
d99148ef | 3653 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
3654 | char psargs[80] = { '\0' }; |
3655 | char *note_data = NULL; | |
3656 | ptid_t current_ptid = inferior_ptid; | |
c6826062 | 3657 | gdb_byte *auxv; |
dba24537 AC |
3658 | int auxv_len; |
3659 | ||
3660 | if (get_exec_file (0)) | |
3661 | { | |
3662 | strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname)); | |
3663 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); | |
3664 | if (get_inferior_args ()) | |
3665 | { | |
d99148ef JK |
3666 | char *string_end; |
3667 | char *psargs_end = psargs + sizeof (psargs); | |
3668 | ||
3669 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
3670 | strings fine. */ | |
3671 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
3672 | if (string_end != NULL) | |
3673 | { | |
3674 | *string_end++ = ' '; | |
3675 | strncpy (string_end, get_inferior_args (), | |
3676 | psargs_end - string_end); | |
3677 | } | |
dba24537 AC |
3678 | } |
3679 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
3680 | note_data, | |
3681 | note_size, fname, psargs); | |
3682 | } | |
3683 | ||
3684 | /* Dump information for threads. */ | |
3685 | thread_args.obfd = obfd; | |
3686 | thread_args.note_data = note_data; | |
3687 | thread_args.note_size = note_size; | |
3688 | thread_args.num_notes = 0; | |
2020b7ab | 3689 | thread_args.stop_signal = find_stop_signal (); |
dba24537 | 3690 | iterate_over_lwps (linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
3691 | gdb_assert (thread_args.num_notes != 0); |
3692 | note_data = thread_args.note_data; | |
dba24537 | 3693 | |
13547ab6 DJ |
3694 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
3695 | NULL, &auxv); | |
dba24537 AC |
3696 | if (auxv_len > 0) |
3697 | { | |
3698 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
3699 | "CORE", NT_AUXV, auxv, auxv_len); | |
3700 | xfree (auxv); | |
3701 | } | |
3702 | ||
3703 | make_cleanup (xfree, note_data); | |
3704 | return note_data; | |
3705 | } | |
3706 | ||
3707 | /* Implement the "info proc" command. */ | |
3708 | ||
3709 | static void | |
3710 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
3711 | { | |
3712 | long long pid = PIDGET (inferior_ptid); | |
3713 | FILE *procfile; | |
3714 | char **argv = NULL; | |
3715 | char buffer[MAXPATHLEN]; | |
3716 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
3717 | int cmdline_f = 1; | |
3718 | int cwd_f = 1; | |
3719 | int exe_f = 1; | |
3720 | int mappings_f = 0; | |
3721 | int environ_f = 0; | |
3722 | int status_f = 0; | |
3723 | int stat_f = 0; | |
3724 | int all = 0; | |
3725 | struct stat dummy; | |
3726 | ||
3727 | if (args) | |
3728 | { | |
3729 | /* Break up 'args' into an argv array. */ | |
d1a41061 PP |
3730 | argv = gdb_buildargv (args); |
3731 | make_cleanup_freeargv (argv); | |
dba24537 AC |
3732 | } |
3733 | while (argv != NULL && *argv != NULL) | |
3734 | { | |
3735 | if (isdigit (argv[0][0])) | |
3736 | { | |
3737 | pid = strtoul (argv[0], NULL, 10); | |
3738 | } | |
3739 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
3740 | { | |
3741 | mappings_f = 1; | |
3742 | } | |
3743 | else if (strcmp (argv[0], "status") == 0) | |
3744 | { | |
3745 | status_f = 1; | |
3746 | } | |
3747 | else if (strcmp (argv[0], "stat") == 0) | |
3748 | { | |
3749 | stat_f = 1; | |
3750 | } | |
3751 | else if (strcmp (argv[0], "cmd") == 0) | |
3752 | { | |
3753 | cmdline_f = 1; | |
3754 | } | |
3755 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
3756 | { | |
3757 | exe_f = 1; | |
3758 | } | |
3759 | else if (strcmp (argv[0], "cwd") == 0) | |
3760 | { | |
3761 | cwd_f = 1; | |
3762 | } | |
3763 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
3764 | { | |
3765 | all = 1; | |
3766 | } | |
3767 | else | |
3768 | { | |
3769 | /* [...] (future options here) */ | |
3770 | } | |
3771 | argv++; | |
3772 | } | |
3773 | if (pid == 0) | |
8a3fe4f8 | 3774 | error (_("No current process: you must name one.")); |
dba24537 AC |
3775 | |
3776 | sprintf (fname1, "/proc/%lld", pid); | |
3777 | if (stat (fname1, &dummy) != 0) | |
8a3fe4f8 | 3778 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 3779 | |
a3f17187 | 3780 | printf_filtered (_("process %lld\n"), pid); |
dba24537 AC |
3781 | if (cmdline_f || all) |
3782 | { | |
3783 | sprintf (fname1, "/proc/%lld/cmdline", pid); | |
d5d6fca5 | 3784 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 3785 | { |
7c8a8b04 | 3786 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
bf1d7d9c JB |
3787 | if (fgets (buffer, sizeof (buffer), procfile)) |
3788 | printf_filtered ("cmdline = '%s'\n", buffer); | |
3789 | else | |
3790 | warning (_("unable to read '%s'"), fname1); | |
7c8a8b04 | 3791 | do_cleanups (cleanup); |
dba24537 AC |
3792 | } |
3793 | else | |
8a3fe4f8 | 3794 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3795 | } |
3796 | if (cwd_f || all) | |
3797 | { | |
3798 | sprintf (fname1, "/proc/%lld/cwd", pid); | |
3799 | memset (fname2, 0, sizeof (fname2)); | |
3800 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
3801 | printf_filtered ("cwd = '%s'\n", fname2); | |
3802 | else | |
8a3fe4f8 | 3803 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
3804 | } |
3805 | if (exe_f || all) | |
3806 | { | |
3807 | sprintf (fname1, "/proc/%lld/exe", pid); | |
3808 | memset (fname2, 0, sizeof (fname2)); | |
3809 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
3810 | printf_filtered ("exe = '%s'\n", fname2); | |
3811 | else | |
8a3fe4f8 | 3812 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
3813 | } |
3814 | if (mappings_f || all) | |
3815 | { | |
3816 | sprintf (fname1, "/proc/%lld/maps", pid); | |
d5d6fca5 | 3817 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
3818 | { |
3819 | long long addr, endaddr, size, offset, inode; | |
3820 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 3821 | struct cleanup *cleanup; |
dba24537 | 3822 | |
7c8a8b04 | 3823 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 3824 | printf_filtered (_("Mapped address spaces:\n\n")); |
17a912b6 | 3825 | if (gdbarch_addr_bit (current_gdbarch) == 32) |
dba24537 AC |
3826 | { |
3827 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
3828 | "Start Addr", | |
3829 | " End Addr", | |
3830 | " Size", " Offset", "objfile"); | |
3831 | } | |
3832 | else | |
3833 | { | |
3834 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
3835 | "Start Addr", | |
3836 | " End Addr", | |
3837 | " Size", " Offset", "objfile"); | |
3838 | } | |
3839 | ||
3840 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
3841 | &offset, &device[0], &inode, &filename[0])) | |
3842 | { | |
3843 | size = endaddr - addr; | |
3844 | ||
3845 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
3846 | calls here (and possibly above) should be abstracted | |
3847 | out into their own functions? Andrew suggests using | |
3848 | a generic local_address_string instead to print out | |
3849 | the addresses; that makes sense to me, too. */ | |
3850 | ||
17a912b6 | 3851 | if (gdbarch_addr_bit (current_gdbarch) == 32) |
dba24537 AC |
3852 | { |
3853 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
3854 | (unsigned long) addr, /* FIXME: pr_addr */ | |
3855 | (unsigned long) endaddr, | |
3856 | (int) size, | |
3857 | (unsigned int) offset, | |
3858 | filename[0] ? filename : ""); | |
3859 | } | |
3860 | else | |
3861 | { | |
3862 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
3863 | (unsigned long) addr, /* FIXME: pr_addr */ | |
3864 | (unsigned long) endaddr, | |
3865 | (int) size, | |
3866 | (unsigned int) offset, | |
3867 | filename[0] ? filename : ""); | |
3868 | } | |
3869 | } | |
3870 | ||
7c8a8b04 | 3871 | do_cleanups (cleanup); |
dba24537 AC |
3872 | } |
3873 | else | |
8a3fe4f8 | 3874 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3875 | } |
3876 | if (status_f || all) | |
3877 | { | |
3878 | sprintf (fname1, "/proc/%lld/status", pid); | |
d5d6fca5 | 3879 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 3880 | { |
7c8a8b04 | 3881 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
3882 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
3883 | puts_filtered (buffer); | |
7c8a8b04 | 3884 | do_cleanups (cleanup); |
dba24537 AC |
3885 | } |
3886 | else | |
8a3fe4f8 | 3887 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3888 | } |
3889 | if (stat_f || all) | |
3890 | { | |
3891 | sprintf (fname1, "/proc/%lld/stat", pid); | |
d5d6fca5 | 3892 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
3893 | { |
3894 | int itmp; | |
3895 | char ctmp; | |
a25694b4 | 3896 | long ltmp; |
7c8a8b04 | 3897 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
3898 | |
3899 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 3900 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 3901 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 3902 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 3903 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 3904 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 3905 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3906 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 3907 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3908 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 3909 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3910 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 3911 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3912 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 3913 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3914 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
3915 | if (fscanf (procfile, "%lu ", <mp) > 0) |
3916 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
3917 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3918 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
3919 | (unsigned long) ltmp); | |
3920 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3921 | printf_filtered (_("Minor faults, children: %lu\n"), | |
3922 | (unsigned long) ltmp); | |
3923 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3924 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
3925 | (unsigned long) ltmp); | |
3926 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3927 | printf_filtered (_("Major faults, children: %lu\n"), | |
3928 | (unsigned long) ltmp); | |
3929 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3930 | printf_filtered (_("utime: %ld\n"), ltmp); | |
3931 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3932 | printf_filtered (_("stime: %ld\n"), ltmp); | |
3933 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3934 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
3935 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3936 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
3937 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3938 | printf_filtered (_("jiffies remaining in current time slice: %ld\n"), | |
3939 | ltmp); | |
3940 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3941 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
3942 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3943 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
3944 | (unsigned long) ltmp); | |
3945 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3946 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
3947 | (unsigned long) ltmp); | |
3948 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3949 | printf_filtered (_("start time (jiffies since system boot): %ld\n"), | |
3950 | ltmp); | |
3951 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3952 | printf_filtered (_("Virtual memory size: %lu\n"), | |
3953 | (unsigned long) ltmp); | |
3954 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3955 | printf_filtered (_("Resident set size: %lu\n"), (unsigned long) ltmp); | |
3956 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3957 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
3958 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3959 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
3960 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3961 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
3962 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3963 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
dba24537 AC |
3964 | #if 0 /* Don't know how architecture-dependent the rest is... |
3965 | Anyway the signal bitmap info is available from "status". */ | |
a25694b4 AS |
3966 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
3967 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); | |
3968 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
3969 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); | |
3970 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3971 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
3972 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3973 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
3974 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3975 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
3976 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3977 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
3978 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
3979 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); | |
dba24537 | 3980 | #endif |
7c8a8b04 | 3981 | do_cleanups (cleanup); |
dba24537 AC |
3982 | } |
3983 | else | |
8a3fe4f8 | 3984 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3985 | } |
3986 | } | |
3987 | ||
10d6c8cd DJ |
3988 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
3989 | filesystem. Because we can use a single read() call for /proc, this | |
3990 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
3991 | but it doesn't support writes. */ | |
3992 | ||
3993 | static LONGEST | |
3994 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
3995 | const char *annex, gdb_byte *readbuf, | |
3996 | const gdb_byte *writebuf, | |
3997 | ULONGEST offset, LONGEST len) | |
dba24537 | 3998 | { |
10d6c8cd DJ |
3999 | LONGEST ret; |
4000 | int fd; | |
dba24537 AC |
4001 | char filename[64]; |
4002 | ||
10d6c8cd | 4003 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
4004 | return 0; |
4005 | ||
4006 | /* Don't bother for one word. */ | |
4007 | if (len < 3 * sizeof (long)) | |
4008 | return 0; | |
4009 | ||
4010 | /* We could keep this file open and cache it - possibly one per | |
4011 | thread. That requires some juggling, but is even faster. */ | |
4012 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
4013 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
4014 | if (fd == -1) | |
4015 | return 0; | |
4016 | ||
4017 | /* If pread64 is available, use it. It's faster if the kernel | |
4018 | supports it (only one syscall), and it's 64-bit safe even on | |
4019 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4020 | application). */ | |
4021 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 4022 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 4023 | #else |
10d6c8cd | 4024 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
4025 | #endif |
4026 | ret = 0; | |
4027 | else | |
4028 | ret = len; | |
4029 | ||
4030 | close (fd); | |
4031 | return ret; | |
4032 | } | |
4033 | ||
4034 | /* Parse LINE as a signal set and add its set bits to SIGS. */ | |
4035 | ||
4036 | static void | |
4037 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
4038 | { | |
4039 | int len = strlen (line) - 1; | |
4040 | const char *p; | |
4041 | int signum; | |
4042 | ||
4043 | if (line[len] != '\n') | |
8a3fe4f8 | 4044 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4045 | |
4046 | p = line; | |
4047 | signum = len * 4; | |
4048 | while (len-- > 0) | |
4049 | { | |
4050 | int digit; | |
4051 | ||
4052 | if (*p >= '0' && *p <= '9') | |
4053 | digit = *p - '0'; | |
4054 | else if (*p >= 'a' && *p <= 'f') | |
4055 | digit = *p - 'a' + 10; | |
4056 | else | |
8a3fe4f8 | 4057 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
4058 | |
4059 | signum -= 4; | |
4060 | ||
4061 | if (digit & 1) | |
4062 | sigaddset (sigs, signum + 1); | |
4063 | if (digit & 2) | |
4064 | sigaddset (sigs, signum + 2); | |
4065 | if (digit & 4) | |
4066 | sigaddset (sigs, signum + 3); | |
4067 | if (digit & 8) | |
4068 | sigaddset (sigs, signum + 4); | |
4069 | ||
4070 | p++; | |
4071 | } | |
4072 | } | |
4073 | ||
4074 | /* Find process PID's pending signals from /proc/pid/status and set | |
4075 | SIGS to match. */ | |
4076 | ||
4077 | void | |
4078 | linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored) | |
4079 | { | |
4080 | FILE *procfile; | |
4081 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
4082 | int signum; | |
7c8a8b04 | 4083 | struct cleanup *cleanup; |
dba24537 AC |
4084 | |
4085 | sigemptyset (pending); | |
4086 | sigemptyset (blocked); | |
4087 | sigemptyset (ignored); | |
4088 | sprintf (fname, "/proc/%d/status", pid); | |
4089 | procfile = fopen (fname, "r"); | |
4090 | if (procfile == NULL) | |
8a3fe4f8 | 4091 | error (_("Could not open %s"), fname); |
7c8a8b04 | 4092 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4093 | |
4094 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
4095 | { | |
4096 | /* Normal queued signals are on the SigPnd line in the status | |
4097 | file. However, 2.6 kernels also have a "shared" pending | |
4098 | queue for delivering signals to a thread group, so check for | |
4099 | a ShdPnd line also. | |
4100 | ||
4101 | Unfortunately some Red Hat kernels include the shared pending | |
4102 | queue but not the ShdPnd status field. */ | |
4103 | ||
4104 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
4105 | add_line_to_sigset (buffer + 8, pending); | |
4106 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
4107 | add_line_to_sigset (buffer + 8, pending); | |
4108 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
4109 | add_line_to_sigset (buffer + 8, blocked); | |
4110 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
4111 | add_line_to_sigset (buffer + 8, ignored); | |
4112 | } | |
4113 | ||
7c8a8b04 | 4114 | do_cleanups (cleanup); |
dba24537 AC |
4115 | } |
4116 | ||
07e059b5 VP |
4117 | static LONGEST |
4118 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
4119 | const char *annex, gdb_byte *readbuf, | |
4120 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4121 | { | |
4122 | /* We make the process list snapshot when the object starts to be | |
4123 | read. */ | |
4124 | static const char *buf; | |
4125 | static LONGEST len_avail = -1; | |
4126 | static struct obstack obstack; | |
4127 | ||
4128 | DIR *dirp; | |
4129 | ||
4130 | gdb_assert (object == TARGET_OBJECT_OSDATA); | |
4131 | ||
4132 | if (strcmp (annex, "processes") != 0) | |
4133 | return 0; | |
4134 | ||
4135 | gdb_assert (readbuf && !writebuf); | |
4136 | ||
4137 | if (offset == 0) | |
4138 | { | |
4139 | if (len_avail != -1 && len_avail != 0) | |
4140 | obstack_free (&obstack, NULL); | |
4141 | len_avail = 0; | |
4142 | buf = NULL; | |
4143 | obstack_init (&obstack); | |
4144 | obstack_grow_str (&obstack, "<osdata type=\"processes\">\n"); | |
4145 | ||
4146 | dirp = opendir ("/proc"); | |
4147 | if (dirp) | |
4148 | { | |
4149 | struct dirent *dp; | |
4150 | while ((dp = readdir (dirp)) != NULL) | |
4151 | { | |
4152 | struct stat statbuf; | |
4153 | char procentry[sizeof ("/proc/4294967295")]; | |
4154 | ||
4155 | if (!isdigit (dp->d_name[0]) | |
4156 | || strlen (dp->d_name) > sizeof ("4294967295") - 1) | |
4157 | continue; | |
4158 | ||
4159 | sprintf (procentry, "/proc/%s", dp->d_name); | |
4160 | if (stat (procentry, &statbuf) == 0 | |
4161 | && S_ISDIR (statbuf.st_mode)) | |
4162 | { | |
4163 | char *pathname; | |
4164 | FILE *f; | |
4165 | char cmd[MAXPATHLEN + 1]; | |
4166 | struct passwd *entry; | |
4167 | ||
4168 | pathname = xstrprintf ("/proc/%s/cmdline", dp->d_name); | |
4169 | entry = getpwuid (statbuf.st_uid); | |
4170 | ||
4171 | if ((f = fopen (pathname, "r")) != NULL) | |
4172 | { | |
4173 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
4174 | if (len > 0) | |
4175 | { | |
4176 | int i; | |
4177 | for (i = 0; i < len; i++) | |
4178 | if (cmd[i] == '\0') | |
4179 | cmd[i] = ' '; | |
4180 | cmd[len] = '\0'; | |
4181 | ||
4182 | obstack_xml_printf ( | |
4183 | &obstack, | |
4184 | "<item>" | |
4185 | "<column name=\"pid\">%s</column>" | |
4186 | "<column name=\"user\">%s</column>" | |
4187 | "<column name=\"command\">%s</column>" | |
4188 | "</item>", | |
4189 | dp->d_name, | |
4190 | entry ? entry->pw_name : "?", | |
4191 | cmd); | |
4192 | } | |
4193 | fclose (f); | |
4194 | } | |
4195 | ||
4196 | xfree (pathname); | |
4197 | } | |
4198 | } | |
4199 | ||
4200 | closedir (dirp); | |
4201 | } | |
4202 | ||
4203 | obstack_grow_str0 (&obstack, "</osdata>\n"); | |
4204 | buf = obstack_finish (&obstack); | |
4205 | len_avail = strlen (buf); | |
4206 | } | |
4207 | ||
4208 | if (offset >= len_avail) | |
4209 | { | |
4210 | /* Done. Get rid of the obstack. */ | |
4211 | obstack_free (&obstack, NULL); | |
4212 | buf = NULL; | |
4213 | len_avail = 0; | |
4214 | return 0; | |
4215 | } | |
4216 | ||
4217 | if (len > len_avail - offset) | |
4218 | len = len_avail - offset; | |
4219 | memcpy (readbuf, buf + offset, len); | |
4220 | ||
4221 | return len; | |
4222 | } | |
4223 | ||
10d6c8cd DJ |
4224 | static LONGEST |
4225 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
4226 | const char *annex, gdb_byte *readbuf, | |
4227 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4228 | { | |
4229 | LONGEST xfer; | |
4230 | ||
4231 | if (object == TARGET_OBJECT_AUXV) | |
4232 | return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf, | |
4233 | offset, len); | |
4234 | ||
07e059b5 VP |
4235 | if (object == TARGET_OBJECT_OSDATA) |
4236 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
4237 | offset, len); | |
4238 | ||
10d6c8cd DJ |
4239 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
4240 | offset, len); | |
4241 | if (xfer != 0) | |
4242 | return xfer; | |
4243 | ||
4244 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
4245 | offset, len); | |
4246 | } | |
4247 | ||
e9efe249 | 4248 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
4249 | it with local methods. */ |
4250 | ||
910122bf UW |
4251 | static void |
4252 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 4253 | { |
6d8fd2b7 UW |
4254 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
4255 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; | |
4256 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; | |
4257 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; | |
10d6c8cd | 4258 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
4259 | t->to_post_attach = linux_child_post_attach; |
4260 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
4261 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
4262 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
4263 | ||
4264 | super_xfer_partial = t->to_xfer_partial; | |
4265 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
4266 | } |
4267 | ||
4268 | struct target_ops * | |
4269 | linux_target (void) | |
4270 | { | |
4271 | struct target_ops *t; | |
4272 | ||
4273 | t = inf_ptrace_target (); | |
4274 | linux_target_install_ops (t); | |
4275 | ||
4276 | return t; | |
4277 | } | |
4278 | ||
4279 | struct target_ops * | |
7714d83a | 4280 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
4281 | { |
4282 | struct target_ops *t; | |
4283 | ||
4284 | t = inf_ptrace_trad_target (register_u_offset); | |
4285 | linux_target_install_ops (t); | |
10d6c8cd | 4286 | |
10d6c8cd DJ |
4287 | return t; |
4288 | } | |
4289 | ||
b84876c2 PA |
4290 | /* target_is_async_p implementation. */ |
4291 | ||
4292 | static int | |
4293 | linux_nat_is_async_p (void) | |
4294 | { | |
4295 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
c6ebd6cf | 4296 | it explicitly with the "maintenance set target-async" command. |
b84876c2 | 4297 | Someday, linux will always be async. */ |
c6ebd6cf | 4298 | if (!target_async_permitted) |
b84876c2 PA |
4299 | return 0; |
4300 | ||
4301 | return 1; | |
4302 | } | |
4303 | ||
4304 | /* target_can_async_p implementation. */ | |
4305 | ||
4306 | static int | |
4307 | linux_nat_can_async_p (void) | |
4308 | { | |
4309 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
c6ebd6cf | 4310 | it explicitly with the "maintenance set target-async" command. |
b84876c2 | 4311 | Someday, linux will always be async. */ |
c6ebd6cf | 4312 | if (!target_async_permitted) |
b84876c2 PA |
4313 | return 0; |
4314 | ||
4315 | /* See target.h/target_async_mask. */ | |
4316 | return linux_nat_async_mask_value; | |
4317 | } | |
4318 | ||
9908b566 VP |
4319 | static int |
4320 | linux_nat_supports_non_stop (void) | |
4321 | { | |
4322 | return 1; | |
4323 | } | |
4324 | ||
b84876c2 PA |
4325 | /* target_async_mask implementation. */ |
4326 | ||
4327 | static int | |
4328 | linux_nat_async_mask (int mask) | |
4329 | { | |
4330 | int current_state; | |
4331 | current_state = linux_nat_async_mask_value; | |
4332 | ||
4333 | if (current_state != mask) | |
4334 | { | |
4335 | if (mask == 0) | |
4336 | { | |
4337 | linux_nat_async (NULL, 0); | |
4338 | linux_nat_async_mask_value = mask; | |
b84876c2 PA |
4339 | } |
4340 | else | |
4341 | { | |
b84876c2 PA |
4342 | linux_nat_async_mask_value = mask; |
4343 | linux_nat_async (inferior_event_handler, 0); | |
4344 | } | |
4345 | } | |
4346 | ||
4347 | return current_state; | |
4348 | } | |
4349 | ||
4350 | /* Pop an event from the event pipe. */ | |
4351 | ||
4352 | static int | |
4353 | linux_nat_event_pipe_pop (int* ptr_status, int* ptr_options) | |
4354 | { | |
4355 | struct waitpid_result event = {0}; | |
4356 | int ret; | |
4357 | ||
4358 | do | |
4359 | { | |
4360 | ret = read (linux_nat_event_pipe[0], &event, sizeof (event)); | |
4361 | } | |
4362 | while (ret == -1 && errno == EINTR); | |
4363 | ||
4364 | gdb_assert (ret == sizeof (event)); | |
4365 | ||
4366 | *ptr_status = event.status; | |
4367 | *ptr_options = event.options; | |
4368 | ||
4369 | linux_nat_num_queued_events--; | |
4370 | ||
4371 | return event.pid; | |
4372 | } | |
4373 | ||
4374 | /* Push an event into the event pipe. */ | |
4375 | ||
4376 | static void | |
4377 | linux_nat_event_pipe_push (int pid, int status, int options) | |
4378 | { | |
4379 | int ret; | |
4380 | struct waitpid_result event = {0}; | |
4381 | event.pid = pid; | |
4382 | event.status = status; | |
4383 | event.options = options; | |
4384 | ||
4385 | do | |
4386 | { | |
4387 | ret = write (linux_nat_event_pipe[1], &event, sizeof (event)); | |
4388 | gdb_assert ((ret == -1 && errno == EINTR) || ret == sizeof (event)); | |
4389 | } while (ret == -1 && errno == EINTR); | |
4390 | ||
4391 | linux_nat_num_queued_events++; | |
4392 | } | |
4393 | ||
4394 | static void | |
4395 | get_pending_events (void) | |
4396 | { | |
4397 | int status, options, pid; | |
4398 | ||
c6ebd6cf | 4399 | if (!target_async_permitted |
84e46146 | 4400 | || linux_nat_async_events_state != sigchld_async) |
b84876c2 PA |
4401 | internal_error (__FILE__, __LINE__, |
4402 | "get_pending_events called with async masked"); | |
4403 | ||
4404 | while (1) | |
4405 | { | |
4406 | status = 0; | |
4407 | options = __WCLONE | WNOHANG; | |
4408 | ||
4409 | do | |
4410 | { | |
4411 | pid = waitpid (-1, &status, options); | |
4412 | } | |
4413 | while (pid == -1 && errno == EINTR); | |
4414 | ||
4415 | if (pid <= 0) | |
4416 | { | |
4417 | options = WNOHANG; | |
4418 | do | |
4419 | { | |
4420 | pid = waitpid (-1, &status, options); | |
4421 | } | |
4422 | while (pid == -1 && errno == EINTR); | |
4423 | } | |
4424 | ||
4425 | if (pid <= 0) | |
4426 | /* No more children reporting events. */ | |
4427 | break; | |
4428 | ||
4429 | if (debug_linux_nat_async) | |
4430 | fprintf_unfiltered (gdb_stdlog, "\ | |
4431 | get_pending_events: pid(%d), status(%x), options (%x)\n", | |
4432 | pid, status, options); | |
4433 | ||
4434 | linux_nat_event_pipe_push (pid, status, options); | |
4435 | } | |
4436 | ||
4437 | if (debug_linux_nat_async) | |
4438 | fprintf_unfiltered (gdb_stdlog, "\ | |
4439 | get_pending_events: linux_nat_num_queued_events(%d)\n", | |
4440 | linux_nat_num_queued_events); | |
4441 | } | |
4442 | ||
4443 | /* SIGCHLD handler for async mode. */ | |
4444 | ||
4445 | static void | |
4446 | async_sigchld_handler (int signo) | |
4447 | { | |
4448 | if (debug_linux_nat_async) | |
4449 | fprintf_unfiltered (gdb_stdlog, "async_sigchld_handler\n"); | |
4450 | ||
4451 | get_pending_events (); | |
4452 | } | |
4453 | ||
84e46146 | 4454 | /* Set SIGCHLD handling state to STATE. Returns previous state. */ |
b84876c2 | 4455 | |
84e46146 PA |
4456 | static enum sigchld_state |
4457 | linux_nat_async_events (enum sigchld_state state) | |
b84876c2 | 4458 | { |
84e46146 | 4459 | enum sigchld_state current_state = linux_nat_async_events_state; |
b84876c2 PA |
4460 | |
4461 | if (debug_linux_nat_async) | |
4462 | fprintf_unfiltered (gdb_stdlog, | |
84e46146 | 4463 | "LNAE: state(%d): linux_nat_async_events_state(%d), " |
b84876c2 | 4464 | "linux_nat_num_queued_events(%d)\n", |
84e46146 | 4465 | state, linux_nat_async_events_state, |
b84876c2 PA |
4466 | linux_nat_num_queued_events); |
4467 | ||
84e46146 | 4468 | if (current_state != state) |
b84876c2 PA |
4469 | { |
4470 | sigset_t mask; | |
4471 | sigemptyset (&mask); | |
4472 | sigaddset (&mask, SIGCHLD); | |
84e46146 PA |
4473 | |
4474 | /* Always block before changing state. */ | |
4475 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4476 | ||
4477 | /* Set new state. */ | |
4478 | linux_nat_async_events_state = state; | |
4479 | ||
4480 | switch (state) | |
b84876c2 | 4481 | { |
84e46146 PA |
4482 | case sigchld_sync: |
4483 | { | |
4484 | /* Block target events. */ | |
4485 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4486 | sigaction (SIGCHLD, &sync_sigchld_action, NULL); | |
4487 | /* Get events out of queue, and make them available to | |
4488 | queued_waitpid / my_waitpid. */ | |
4489 | pipe_to_local_event_queue (); | |
4490 | } | |
4491 | break; | |
4492 | case sigchld_async: | |
4493 | { | |
4494 | /* Unblock target events for async mode. */ | |
4495 | ||
4496 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4497 | ||
4498 | /* Put events we already waited on, in the pipe first, so | |
4499 | events are FIFO. */ | |
4500 | local_event_queue_to_pipe (); | |
4501 | /* While in masked async, we may have not collected all | |
4502 | the pending events. Get them out now. */ | |
4503 | get_pending_events (); | |
4504 | ||
4505 | /* Let'em come. */ | |
4506 | sigaction (SIGCHLD, &async_sigchld_action, NULL); | |
4507 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4508 | } | |
4509 | break; | |
4510 | case sigchld_default: | |
4511 | { | |
4512 | /* SIGCHLD default mode. */ | |
4513 | sigaction (SIGCHLD, &sigchld_default_action, NULL); | |
4514 | ||
4515 | /* Get events out of queue, and make them available to | |
4516 | queued_waitpid / my_waitpid. */ | |
4517 | pipe_to_local_event_queue (); | |
4518 | ||
4519 | /* Unblock SIGCHLD. */ | |
4520 | sigprocmask (SIG_UNBLOCK, &mask, NULL); | |
4521 | } | |
4522 | break; | |
b84876c2 PA |
4523 | } |
4524 | } | |
4525 | ||
4526 | return current_state; | |
4527 | } | |
4528 | ||
4529 | static int async_terminal_is_ours = 1; | |
4530 | ||
4531 | /* target_terminal_inferior implementation. */ | |
4532 | ||
4533 | static void | |
4534 | linux_nat_terminal_inferior (void) | |
4535 | { | |
4536 | if (!target_is_async_p ()) | |
4537 | { | |
4538 | /* Async mode is disabled. */ | |
4539 | terminal_inferior (); | |
4540 | return; | |
4541 | } | |
4542 | ||
4543 | /* GDB should never give the terminal to the inferior, if the | |
4544 | inferior is running in the background (run&, continue&, etc.). | |
4545 | This check can be removed when the common code is fixed. */ | |
4546 | if (!sync_execution) | |
4547 | return; | |
4548 | ||
4549 | terminal_inferior (); | |
4550 | ||
4551 | if (!async_terminal_is_ours) | |
4552 | return; | |
4553 | ||
4554 | delete_file_handler (input_fd); | |
4555 | async_terminal_is_ours = 0; | |
4556 | set_sigint_trap (); | |
4557 | } | |
4558 | ||
4559 | /* target_terminal_ours implementation. */ | |
4560 | ||
2c0b251b | 4561 | static void |
b84876c2 PA |
4562 | linux_nat_terminal_ours (void) |
4563 | { | |
4564 | if (!target_is_async_p ()) | |
4565 | { | |
4566 | /* Async mode is disabled. */ | |
4567 | terminal_ours (); | |
4568 | return; | |
4569 | } | |
4570 | ||
4571 | /* GDB should never give the terminal to the inferior if the | |
4572 | inferior is running in the background (run&, continue&, etc.), | |
4573 | but claiming it sure should. */ | |
4574 | terminal_ours (); | |
4575 | ||
4576 | if (!sync_execution) | |
4577 | return; | |
4578 | ||
4579 | if (async_terminal_is_ours) | |
4580 | return; | |
4581 | ||
4582 | clear_sigint_trap (); | |
4583 | add_file_handler (input_fd, stdin_event_handler, 0); | |
4584 | async_terminal_is_ours = 1; | |
4585 | } | |
4586 | ||
4587 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
4588 | void *context); | |
4589 | static void *async_client_context; | |
4590 | ||
4591 | static void | |
4592 | linux_nat_async_file_handler (int error, gdb_client_data client_data) | |
4593 | { | |
4594 | async_client_callback (INF_REG_EVENT, async_client_context); | |
4595 | } | |
4596 | ||
4597 | /* target_async implementation. */ | |
4598 | ||
4599 | static void | |
4600 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
4601 | void *context), void *context) | |
4602 | { | |
c6ebd6cf | 4603 | if (linux_nat_async_mask_value == 0 || !target_async_permitted) |
b84876c2 PA |
4604 | internal_error (__FILE__, __LINE__, |
4605 | "Calling target_async when async is masked"); | |
4606 | ||
4607 | if (callback != NULL) | |
4608 | { | |
4609 | async_client_callback = callback; | |
4610 | async_client_context = context; | |
4611 | add_file_handler (linux_nat_event_pipe[0], | |
4612 | linux_nat_async_file_handler, NULL); | |
4613 | ||
84e46146 | 4614 | linux_nat_async_events (sigchld_async); |
b84876c2 PA |
4615 | } |
4616 | else | |
4617 | { | |
4618 | async_client_callback = callback; | |
4619 | async_client_context = context; | |
4620 | ||
84e46146 | 4621 | linux_nat_async_events (sigchld_sync); |
b84876c2 PA |
4622 | delete_file_handler (linux_nat_event_pipe[0]); |
4623 | } | |
4624 | return; | |
4625 | } | |
4626 | ||
252fbfc8 PA |
4627 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
4628 | event came out. */ | |
4629 | ||
4c28f408 | 4630 | static int |
252fbfc8 | 4631 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 4632 | { |
252fbfc8 PA |
4633 | ptid_t ptid = * (ptid_t *) data; |
4634 | ||
4635 | if (ptid_equal (lwp->ptid, ptid) | |
4636 | || ptid_equal (minus_one_ptid, ptid) | |
4637 | || (ptid_is_pid (ptid) | |
4638 | && ptid_get_pid (ptid) == ptid_get_pid (lwp->ptid))) | |
4639 | { | |
4640 | if (!lwp->stopped) | |
4641 | { | |
4642 | int pid, status; | |
4643 | ||
4644 | if (debug_linux_nat) | |
4645 | fprintf_unfiltered (gdb_stdlog, | |
4646 | "LNSL: running -> suspending %s\n", | |
4647 | target_pid_to_str (lwp->ptid)); | |
4648 | ||
4649 | /* Peek once, to check if we've already waited for this | |
4650 | LWP. */ | |
4651 | pid = queued_waitpid_1 (ptid_get_lwp (lwp->ptid), &status, | |
4652 | lwp->cloned ? __WCLONE : 0, 1 /* peek */); | |
4653 | ||
4654 | if (pid == -1) | |
4655 | { | |
4656 | ptid_t ptid = lwp->ptid; | |
4657 | ||
4658 | stop_callback (lwp, NULL); | |
4659 | stop_wait_callback (lwp, NULL); | |
4660 | ||
4661 | /* If the lwp exits while we try to stop it, there's | |
4662 | nothing else to do. */ | |
4663 | lwp = find_lwp_pid (ptid); | |
4664 | if (lwp == NULL) | |
4665 | return 0; | |
4666 | ||
4667 | pid = queued_waitpid_1 (ptid_get_lwp (lwp->ptid), &status, | |
4668 | lwp->cloned ? __WCLONE : 0, | |
4669 | 1 /* peek */); | |
4670 | } | |
4671 | ||
4672 | /* If we didn't collect any signal other than SIGSTOP while | |
4673 | stopping the LWP, push a SIGNAL_0 event. In either case, | |
4674 | the event-loop will end up calling target_wait which will | |
4675 | collect these. */ | |
4676 | if (pid == -1) | |
4677 | push_waitpid (ptid_get_lwp (lwp->ptid), W_STOPCODE (0), | |
4678 | lwp->cloned ? __WCLONE : 0); | |
4679 | } | |
4680 | else | |
4681 | { | |
4682 | /* Already known to be stopped; do nothing. */ | |
4683 | ||
4684 | if (debug_linux_nat) | |
4685 | { | |
4686 | if (find_thread_pid (lwp->ptid)->stop_requested) | |
4687 | fprintf_unfiltered (gdb_stdlog, "\ | |
4688 | LNSL: already stopped/stop_requested %s\n", | |
4689 | target_pid_to_str (lwp->ptid)); | |
4690 | else | |
4691 | fprintf_unfiltered (gdb_stdlog, "\ | |
4692 | LNSL: already stopped/no stop_requested yet %s\n", | |
4693 | target_pid_to_str (lwp->ptid)); | |
4694 | } | |
4695 | } | |
4696 | } | |
4c28f408 PA |
4697 | return 0; |
4698 | } | |
4699 | ||
4700 | static void | |
4701 | linux_nat_stop (ptid_t ptid) | |
4702 | { | |
4703 | if (non_stop) | |
4704 | { | |
252fbfc8 PA |
4705 | linux_nat_async_events (sigchld_sync); |
4706 | iterate_over_lwps (linux_nat_stop_lwp, &ptid); | |
4707 | target_async (inferior_event_handler, 0); | |
4c28f408 PA |
4708 | } |
4709 | else | |
4710 | linux_ops->to_stop (ptid); | |
4711 | } | |
4712 | ||
f973ed9c DJ |
4713 | void |
4714 | linux_nat_add_target (struct target_ops *t) | |
4715 | { | |
f973ed9c DJ |
4716 | /* Save the provided single-threaded target. We save this in a separate |
4717 | variable because another target we've inherited from (e.g. inf-ptrace) | |
4718 | may have saved a pointer to T; we want to use it for the final | |
4719 | process stratum target. */ | |
4720 | linux_ops_saved = *t; | |
4721 | linux_ops = &linux_ops_saved; | |
4722 | ||
4723 | /* Override some methods for multithreading. */ | |
b84876c2 | 4724 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
4725 | t->to_attach = linux_nat_attach; |
4726 | t->to_detach = linux_nat_detach; | |
4727 | t->to_resume = linux_nat_resume; | |
4728 | t->to_wait = linux_nat_wait; | |
4729 | t->to_xfer_partial = linux_nat_xfer_partial; | |
4730 | t->to_kill = linux_nat_kill; | |
4731 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
4732 | t->to_thread_alive = linux_nat_thread_alive; | |
4733 | t->to_pid_to_str = linux_nat_pid_to_str; | |
4734 | t->to_has_thread_control = tc_schedlock; | |
4735 | ||
b84876c2 PA |
4736 | t->to_can_async_p = linux_nat_can_async_p; |
4737 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 4738 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 PA |
4739 | t->to_async = linux_nat_async; |
4740 | t->to_async_mask = linux_nat_async_mask; | |
4741 | t->to_terminal_inferior = linux_nat_terminal_inferior; | |
4742 | t->to_terminal_ours = linux_nat_terminal_ours; | |
4743 | ||
4c28f408 PA |
4744 | /* Methods for non-stop support. */ |
4745 | t->to_stop = linux_nat_stop; | |
4746 | ||
f973ed9c DJ |
4747 | /* We don't change the stratum; this target will sit at |
4748 | process_stratum and thread_db will set at thread_stratum. This | |
4749 | is a little strange, since this is a multi-threaded-capable | |
4750 | target, but we want to be on the stack below thread_db, and we | |
4751 | also want to be used for single-threaded processes. */ | |
4752 | ||
4753 | add_target (t); | |
f973ed9c DJ |
4754 | } |
4755 | ||
9f0bdab8 DJ |
4756 | /* Register a method to call whenever a new thread is attached. */ |
4757 | void | |
4758 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
4759 | { | |
4760 | /* Save the pointer. We only support a single registered instance | |
4761 | of the GNU/Linux native target, so we do not need to map this to | |
4762 | T. */ | |
4763 | linux_nat_new_thread = new_thread; | |
4764 | } | |
4765 | ||
5b009018 PA |
4766 | /* Register a method that converts a siginfo object between the layout |
4767 | that ptrace returns, and the layout in the architecture of the | |
4768 | inferior. */ | |
4769 | void | |
4770 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
4771 | int (*siginfo_fixup) (struct siginfo *, | |
4772 | gdb_byte *, | |
4773 | int)) | |
4774 | { | |
4775 | /* Save the pointer. */ | |
4776 | linux_nat_siginfo_fixup = siginfo_fixup; | |
4777 | } | |
4778 | ||
9f0bdab8 DJ |
4779 | /* Return the saved siginfo associated with PTID. */ |
4780 | struct siginfo * | |
4781 | linux_nat_get_siginfo (ptid_t ptid) | |
4782 | { | |
4783 | struct lwp_info *lp = find_lwp_pid (ptid); | |
4784 | ||
4785 | gdb_assert (lp != NULL); | |
4786 | ||
4787 | return &lp->siginfo; | |
4788 | } | |
4789 | ||
c6ebd6cf VP |
4790 | /* Enable/Disable async mode. */ |
4791 | ||
4792 | static void | |
4793 | linux_nat_setup_async (void) | |
4794 | { | |
4795 | if (pipe (linux_nat_event_pipe) == -1) | |
4796 | internal_error (__FILE__, __LINE__, | |
4797 | "creating event pipe failed."); | |
4798 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4799 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4800 | } | |
4801 | ||
2c0b251b PA |
4802 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
4803 | extern initialize_file_ftype _initialize_linux_nat; | |
4804 | ||
d6b0e80f AC |
4805 | void |
4806 | _initialize_linux_nat (void) | |
4807 | { | |
b84876c2 | 4808 | sigset_t mask; |
dba24537 | 4809 | |
1bedd215 AC |
4810 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
4811 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
4812 | Specify any process id, or use the program being debugged by default.\n\ |
4813 | Specify any of the following keywords for detailed info:\n\ | |
4814 | mappings -- list of mapped memory regions.\n\ | |
4815 | stat -- list a bunch of random process info.\n\ | |
4816 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 4817 | all -- list all available /proc info.")); |
d6b0e80f | 4818 | |
b84876c2 PA |
4819 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
4820 | &debug_linux_nat, _("\ | |
4821 | Set debugging of GNU/Linux lwp module."), _("\ | |
4822 | Show debugging of GNU/Linux lwp module."), _("\ | |
4823 | Enables printf debugging output."), | |
4824 | NULL, | |
4825 | show_debug_linux_nat, | |
4826 | &setdebuglist, &showdebuglist); | |
4827 | ||
4828 | add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance, | |
4829 | &debug_linux_nat_async, _("\ | |
4830 | Set debugging of GNU/Linux async lwp module."), _("\ | |
4831 | Show debugging of GNU/Linux async lwp module."), _("\ | |
4832 | Enables printf debugging output."), | |
4833 | NULL, | |
4834 | show_debug_linux_nat_async, | |
4835 | &setdebuglist, &showdebuglist); | |
4836 | ||
84e46146 PA |
4837 | /* Get the default SIGCHLD action. Used while forking an inferior |
4838 | (see linux_nat_create_inferior/linux_nat_async_events). */ | |
4839 | sigaction (SIGCHLD, NULL, &sigchld_default_action); | |
4840 | ||
b84876c2 PA |
4841 | /* Block SIGCHLD by default. Doing this early prevents it getting |
4842 | unblocked if an exception is thrown due to an error while the | |
4843 | inferior is starting (sigsetjmp/siglongjmp). */ | |
4844 | sigemptyset (&mask); | |
4845 | sigaddset (&mask, SIGCHLD); | |
4846 | sigprocmask (SIG_BLOCK, &mask, NULL); | |
4847 | ||
4848 | /* Save this mask as the default. */ | |
d6b0e80f AC |
4849 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
4850 | ||
b84876c2 PA |
4851 | /* The synchronous SIGCHLD handler. */ |
4852 | sync_sigchld_action.sa_handler = sigchld_handler; | |
4853 | sigemptyset (&sync_sigchld_action.sa_mask); | |
4854 | sync_sigchld_action.sa_flags = SA_RESTART; | |
4855 | ||
4856 | /* Make it the default. */ | |
4857 | sigaction (SIGCHLD, &sync_sigchld_action, NULL); | |
d6b0e80f AC |
4858 | |
4859 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
4860 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
4861 | sigdelset (&suspend_mask, SIGCHLD); | |
4862 | ||
b84876c2 PA |
4863 | /* SIGCHLD handler for async mode. */ |
4864 | async_sigchld_action.sa_handler = async_sigchld_handler; | |
4865 | sigemptyset (&async_sigchld_action.sa_mask); | |
4866 | async_sigchld_action.sa_flags = SA_RESTART; | |
d6b0e80f | 4867 | |
c6ebd6cf | 4868 | linux_nat_setup_async (); |
10568435 JK |
4869 | |
4870 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
4871 | &disable_randomization, _("\ | |
4872 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
4873 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
4874 | When this mode is on (which is the default), randomization of the virtual\n\ | |
4875 | address space is disabled. Standalone programs run with the randomization\n\ | |
4876 | enabled by default on some platforms."), | |
4877 | &set_disable_randomization, | |
4878 | &show_disable_randomization, | |
4879 | &setlist, &showlist); | |
d6b0e80f AC |
4880 | } |
4881 | \f | |
4882 | ||
4883 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
4884 | the GNU/Linux Threads library and therefore doesn't really belong | |
4885 | here. */ | |
4886 | ||
4887 | /* Read variable NAME in the target and return its value if found. | |
4888 | Otherwise return zero. It is assumed that the type of the variable | |
4889 | is `int'. */ | |
4890 | ||
4891 | static int | |
4892 | get_signo (const char *name) | |
4893 | { | |
4894 | struct minimal_symbol *ms; | |
4895 | int signo; | |
4896 | ||
4897 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
4898 | if (ms == NULL) | |
4899 | return 0; | |
4900 | ||
8e70166d | 4901 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
4902 | sizeof (signo)) != 0) |
4903 | return 0; | |
4904 | ||
4905 | return signo; | |
4906 | } | |
4907 | ||
4908 | /* Return the set of signals used by the threads library in *SET. */ | |
4909 | ||
4910 | void | |
4911 | lin_thread_get_thread_signals (sigset_t *set) | |
4912 | { | |
4913 | struct sigaction action; | |
4914 | int restart, cancel; | |
b84876c2 | 4915 | sigset_t blocked_mask; |
d6b0e80f | 4916 | |
b84876c2 | 4917 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
4918 | sigemptyset (set); |
4919 | ||
4920 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
4921 | cancel = get_signo ("__pthread_sig_cancel"); |
4922 | ||
4923 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
4924 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
4925 | not provide any way for the debugger to query the signal numbers - | |
4926 | fortunately they don't change! */ | |
4927 | ||
d6b0e80f | 4928 | if (restart == 0) |
17fbb0bd | 4929 | restart = __SIGRTMIN; |
d6b0e80f | 4930 | |
d6b0e80f | 4931 | if (cancel == 0) |
17fbb0bd | 4932 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
4933 | |
4934 | sigaddset (set, restart); | |
4935 | sigaddset (set, cancel); | |
4936 | ||
4937 | /* The GNU/Linux Threads library makes terminating threads send a | |
4938 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
4939 | those (to prevent them from terminating GDB itself, which is | |
4940 | likely to be their default action) and treat them the same way as | |
4941 | SIGCHLD. */ | |
4942 | ||
4943 | action.sa_handler = sigchld_handler; | |
4944 | sigemptyset (&action.sa_mask); | |
58aecb61 | 4945 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
4946 | sigaction (cancel, &action, NULL); |
4947 | ||
4948 | /* We block the "cancel" signal throughout this code ... */ | |
4949 | sigaddset (&blocked_mask, cancel); | |
4950 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
4951 | ||
4952 | /* ... except during a sigsuspend. */ | |
4953 | sigdelset (&suspend_mask, cancel); | |
4954 | } |