Commit | Line | Data |
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3993f6b1 | 1 | /* GNU/Linux native-dependent code common to multiple platforms. |
dba24537 | 2 | |
7b6bb8da JB |
3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, |
4 | 2011 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" |
af96c192 | 33 | #include "linux-ptrace.h" |
13da1c97 | 34 | #include "linux-procfs.h" |
ac264b3b | 35 | #include "linux-fork.h" |
d6b0e80f AC |
36 | #include "gdbthread.h" |
37 | #include "gdbcmd.h" | |
38 | #include "regcache.h" | |
4f844a66 | 39 | #include "regset.h" |
10d6c8cd DJ |
40 | #include "inf-ptrace.h" |
41 | #include "auxv.h" | |
dba24537 | 42 | #include <sys/param.h> /* for MAXPATHLEN */ |
1777feb0 | 43 | #include <sys/procfs.h> /* for elf_gregset etc. */ |
dba24537 AC |
44 | #include "elf-bfd.h" /* for elfcore_write_* */ |
45 | #include "gregset.h" /* for gregset */ | |
46 | #include "gdbcore.h" /* for get_exec_file */ | |
47 | #include <ctype.h> /* for isdigit */ | |
1777feb0 | 48 | #include "gdbthread.h" /* for struct thread_info etc. */ |
dba24537 AC |
49 | #include "gdb_stat.h" /* for struct stat */ |
50 | #include <fcntl.h> /* for O_RDONLY */ | |
b84876c2 PA |
51 | #include "inf-loop.h" |
52 | #include "event-loop.h" | |
53 | #include "event-top.h" | |
07e059b5 VP |
54 | #include <pwd.h> |
55 | #include <sys/types.h> | |
56 | #include "gdb_dirent.h" | |
57 | #include "xml-support.h" | |
191c4426 | 58 | #include "terminal.h" |
efcbbd14 | 59 | #include <sys/vfs.h> |
6c95b8df | 60 | #include "solib.h" |
d26e3629 | 61 | #include "linux-osdata.h" |
efcbbd14 UW |
62 | |
63 | #ifndef SPUFS_MAGIC | |
64 | #define SPUFS_MAGIC 0x23c9b64e | |
65 | #endif | |
dba24537 | 66 | |
10568435 JK |
67 | #ifdef HAVE_PERSONALITY |
68 | # include <sys/personality.h> | |
69 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
70 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
71 | # endif | |
72 | #endif /* HAVE_PERSONALITY */ | |
73 | ||
1777feb0 | 74 | /* This comment documents high-level logic of this file. |
8a77dff3 VP |
75 | |
76 | Waiting for events in sync mode | |
77 | =============================== | |
78 | ||
79 | When waiting for an event in a specific thread, we just use waitpid, passing | |
80 | the specific pid, and not passing WNOHANG. | |
81 | ||
1777feb0 | 82 | When waiting for an event in all threads, waitpid is not quite good. Prior to |
8a77dff3 | 83 | version 2.4, Linux can either wait for event in main thread, or in secondary |
1777feb0 | 84 | threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might |
8a77dff3 VP |
85 | miss an event. The solution is to use non-blocking waitpid, together with |
86 | sigsuspend. First, we use non-blocking waitpid to get an event in the main | |
1777feb0 | 87 | process, if any. Second, we use non-blocking waitpid with the __WCLONED |
8a77dff3 VP |
88 | flag to check for events in cloned processes. If nothing is found, we use |
89 | sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something | |
90 | happened to a child process -- and SIGCHLD will be delivered both for events | |
91 | in main debugged process and in cloned processes. As soon as we know there's | |
3e43a32a MS |
92 | an event, we get back to calling nonblocking waitpid with and without |
93 | __WCLONED. | |
8a77dff3 VP |
94 | |
95 | Note that SIGCHLD should be blocked between waitpid and sigsuspend calls, | |
1777feb0 | 96 | so that we don't miss a signal. If SIGCHLD arrives in between, when it's |
8a77dff3 VP |
97 | blocked, the signal becomes pending and sigsuspend immediately |
98 | notices it and returns. | |
99 | ||
100 | Waiting for events in async mode | |
101 | ================================ | |
102 | ||
7feb7d06 PA |
103 | In async mode, GDB should always be ready to handle both user input |
104 | and target events, so neither blocking waitpid nor sigsuspend are | |
105 | viable options. Instead, we should asynchronously notify the GDB main | |
106 | event loop whenever there's an unprocessed event from the target. We | |
107 | detect asynchronous target events by handling SIGCHLD signals. To | |
108 | notify the event loop about target events, the self-pipe trick is used | |
109 | --- a pipe is registered as waitable event source in the event loop, | |
110 | the event loop select/poll's on the read end of this pipe (as well on | |
111 | other event sources, e.g., stdin), and the SIGCHLD handler writes a | |
112 | byte to this pipe. This is more portable than relying on | |
113 | pselect/ppoll, since on kernels that lack those syscalls, libc | |
114 | emulates them with select/poll+sigprocmask, and that is racy | |
115 | (a.k.a. plain broken). | |
116 | ||
117 | Obviously, if we fail to notify the event loop if there's a target | |
118 | event, it's bad. OTOH, if we notify the event loop when there's no | |
119 | event from the target, linux_nat_wait will detect that there's no real | |
120 | event to report, and return event of type TARGET_WAITKIND_IGNORE. | |
121 | This is mostly harmless, but it will waste time and is better avoided. | |
122 | ||
123 | The main design point is that every time GDB is outside linux-nat.c, | |
124 | we have a SIGCHLD handler installed that is called when something | |
125 | happens to the target and notifies the GDB event loop. Whenever GDB | |
126 | core decides to handle the event, and calls into linux-nat.c, we | |
127 | process things as in sync mode, except that the we never block in | |
128 | sigsuspend. | |
129 | ||
130 | While processing an event, we may end up momentarily blocked in | |
131 | waitpid calls. Those waitpid calls, while blocking, are guarantied to | |
132 | return quickly. E.g., in all-stop mode, before reporting to the core | |
133 | that an LWP hit a breakpoint, all LWPs are stopped by sending them | |
134 | SIGSTOP, and synchronously waiting for the SIGSTOP to be reported. | |
135 | Note that this is different from blocking indefinitely waiting for the | |
136 | next event --- here, we're already handling an event. | |
8a77dff3 VP |
137 | |
138 | Use of signals | |
139 | ============== | |
140 | ||
141 | We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another | |
142 | signal is not entirely significant; we just need for a signal to be delivered, | |
143 | so that we can intercept it. SIGSTOP's advantage is that it can not be | |
144 | blocked. A disadvantage is that it is not a real-time signal, so it can only | |
145 | be queued once; we do not keep track of other sources of SIGSTOP. | |
146 | ||
147 | Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't | |
148 | use them, because they have special behavior when the signal is generated - | |
149 | not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL | |
150 | kills the entire thread group. | |
151 | ||
152 | A delivered SIGSTOP would stop the entire thread group, not just the thread we | |
153 | tkill'd. But we never let the SIGSTOP be delivered; we always intercept and | |
154 | cancel it (by PTRACE_CONT without passing SIGSTOP). | |
155 | ||
156 | We could use a real-time signal instead. This would solve those problems; we | |
157 | could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB. | |
158 | But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH | |
159 | generates it, and there are races with trying to find a signal that is not | |
160 | blocked. */ | |
a0ef4274 | 161 | |
dba24537 AC |
162 | #ifndef O_LARGEFILE |
163 | #define O_LARGEFILE 0 | |
164 | #endif | |
0274a8ce | 165 | |
ca2163eb PA |
166 | /* Unlike other extended result codes, WSTOPSIG (status) on |
167 | PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but | |
168 | instead SIGTRAP with bit 7 set. */ | |
169 | #define SYSCALL_SIGTRAP (SIGTRAP | 0x80) | |
170 | ||
10d6c8cd DJ |
171 | /* The single-threaded native GNU/Linux target_ops. We save a pointer for |
172 | the use of the multi-threaded target. */ | |
173 | static struct target_ops *linux_ops; | |
f973ed9c | 174 | static struct target_ops linux_ops_saved; |
10d6c8cd | 175 | |
9f0bdab8 DJ |
176 | /* The method to call, if any, when a new thread is attached. */ |
177 | static void (*linux_nat_new_thread) (ptid_t); | |
178 | ||
5b009018 PA |
179 | /* The method to call, if any, when the siginfo object needs to be |
180 | converted between the layout returned by ptrace, and the layout in | |
181 | the architecture of the inferior. */ | |
182 | static int (*linux_nat_siginfo_fixup) (struct siginfo *, | |
183 | gdb_byte *, | |
184 | int); | |
185 | ||
ac264b3b MS |
186 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
187 | Called by our to_xfer_partial. */ | |
188 | static LONGEST (*super_xfer_partial) (struct target_ops *, | |
189 | enum target_object, | |
190 | const char *, gdb_byte *, | |
191 | const gdb_byte *, | |
10d6c8cd DJ |
192 | ULONGEST, LONGEST); |
193 | ||
d6b0e80f | 194 | static int debug_linux_nat; |
920d2a44 AC |
195 | static void |
196 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
197 | struct cmd_list_element *c, const char *value) | |
198 | { | |
199 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
200 | value); | |
201 | } | |
d6b0e80f | 202 | |
ae087d01 DJ |
203 | struct simple_pid_list |
204 | { | |
205 | int pid; | |
3d799a95 | 206 | int status; |
ae087d01 DJ |
207 | struct simple_pid_list *next; |
208 | }; | |
209 | struct simple_pid_list *stopped_pids; | |
210 | ||
3993f6b1 DJ |
211 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
212 | can not be used, 1 if it can. */ | |
213 | ||
214 | static int linux_supports_tracefork_flag = -1; | |
215 | ||
3e43a32a MS |
216 | /* This variable is a tri-state flag: -1 for unknown, 0 if |
217 | PTRACE_O_TRACESYSGOOD can not be used, 1 if it can. */ | |
a96d9b2e SDJ |
218 | |
219 | static int linux_supports_tracesysgood_flag = -1; | |
220 | ||
9016a515 DJ |
221 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
222 | PTRACE_O_TRACEVFORKDONE. */ | |
223 | ||
224 | static int linux_supports_tracevforkdone_flag = -1; | |
225 | ||
a96d9b2e SDJ |
226 | /* Stores the current used ptrace() options. */ |
227 | static int current_ptrace_options = 0; | |
228 | ||
3dd5b83d PA |
229 | /* Async mode support. */ |
230 | ||
b84876c2 PA |
231 | /* The read/write ends of the pipe registered as waitable file in the |
232 | event loop. */ | |
233 | static int linux_nat_event_pipe[2] = { -1, -1 }; | |
234 | ||
7feb7d06 | 235 | /* Flush the event pipe. */ |
b84876c2 | 236 | |
7feb7d06 PA |
237 | static void |
238 | async_file_flush (void) | |
b84876c2 | 239 | { |
7feb7d06 PA |
240 | int ret; |
241 | char buf; | |
b84876c2 | 242 | |
7feb7d06 | 243 | do |
b84876c2 | 244 | { |
7feb7d06 | 245 | ret = read (linux_nat_event_pipe[0], &buf, 1); |
b84876c2 | 246 | } |
7feb7d06 | 247 | while (ret >= 0 || (ret == -1 && errno == EINTR)); |
b84876c2 PA |
248 | } |
249 | ||
7feb7d06 PA |
250 | /* Put something (anything, doesn't matter what, or how much) in event |
251 | pipe, so that the select/poll in the event-loop realizes we have | |
252 | something to process. */ | |
252fbfc8 | 253 | |
b84876c2 | 254 | static void |
7feb7d06 | 255 | async_file_mark (void) |
b84876c2 | 256 | { |
7feb7d06 | 257 | int ret; |
b84876c2 | 258 | |
7feb7d06 PA |
259 | /* It doesn't really matter what the pipe contains, as long we end |
260 | up with something in it. Might as well flush the previous | |
261 | left-overs. */ | |
262 | async_file_flush (); | |
b84876c2 | 263 | |
7feb7d06 | 264 | do |
b84876c2 | 265 | { |
7feb7d06 | 266 | ret = write (linux_nat_event_pipe[1], "+", 1); |
b84876c2 | 267 | } |
7feb7d06 | 268 | while (ret == -1 && errno == EINTR); |
b84876c2 | 269 | |
7feb7d06 PA |
270 | /* Ignore EAGAIN. If the pipe is full, the event loop will already |
271 | be awakened anyway. */ | |
b84876c2 PA |
272 | } |
273 | ||
7feb7d06 | 274 | static void linux_nat_async (void (*callback) |
3e43a32a MS |
275 | (enum inferior_event_type event_type, |
276 | void *context), | |
7feb7d06 | 277 | void *context); |
7feb7d06 PA |
278 | static int kill_lwp (int lwpid, int signo); |
279 | ||
280 | static int stop_callback (struct lwp_info *lp, void *data); | |
281 | ||
282 | static void block_child_signals (sigset_t *prev_mask); | |
283 | static void restore_child_signals_mask (sigset_t *prev_mask); | |
2277426b PA |
284 | |
285 | struct lwp_info; | |
286 | static struct lwp_info *add_lwp (ptid_t ptid); | |
287 | static void purge_lwp_list (int pid); | |
288 | static struct lwp_info *find_lwp_pid (ptid_t ptid); | |
289 | ||
ae087d01 DJ |
290 | \f |
291 | /* Trivial list manipulation functions to keep track of a list of | |
292 | new stopped processes. */ | |
293 | static void | |
3d799a95 | 294 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) |
ae087d01 DJ |
295 | { |
296 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
e0881a8e | 297 | |
ae087d01 | 298 | new_pid->pid = pid; |
3d799a95 | 299 | new_pid->status = status; |
ae087d01 DJ |
300 | new_pid->next = *listp; |
301 | *listp = new_pid; | |
302 | } | |
303 | ||
84636d28 PA |
304 | static int |
305 | in_pid_list_p (struct simple_pid_list *list, int pid) | |
306 | { | |
307 | struct simple_pid_list *p; | |
308 | ||
309 | for (p = list; p != NULL; p = p->next) | |
310 | if (p->pid == pid) | |
311 | return 1; | |
312 | return 0; | |
313 | } | |
314 | ||
ae087d01 | 315 | static int |
46a96992 | 316 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) |
ae087d01 DJ |
317 | { |
318 | struct simple_pid_list **p; | |
319 | ||
320 | for (p = listp; *p != NULL; p = &(*p)->next) | |
321 | if ((*p)->pid == pid) | |
322 | { | |
323 | struct simple_pid_list *next = (*p)->next; | |
e0881a8e | 324 | |
46a96992 | 325 | *statusp = (*p)->status; |
ae087d01 DJ |
326 | xfree (*p); |
327 | *p = next; | |
328 | return 1; | |
329 | } | |
330 | return 0; | |
331 | } | |
332 | ||
3993f6b1 DJ |
333 | \f |
334 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
335 | ||
336 | static void | |
337 | linux_tracefork_child (void) | |
338 | { | |
3993f6b1 DJ |
339 | ptrace (PTRACE_TRACEME, 0, 0, 0); |
340 | kill (getpid (), SIGSTOP); | |
341 | fork (); | |
48bb3cce | 342 | _exit (0); |
3993f6b1 DJ |
343 | } |
344 | ||
7feb7d06 | 345 | /* Wrapper function for waitpid which handles EINTR. */ |
b957e937 DJ |
346 | |
347 | static int | |
46a96992 | 348 | my_waitpid (int pid, int *statusp, int flags) |
b957e937 DJ |
349 | { |
350 | int ret; | |
b84876c2 | 351 | |
b957e937 DJ |
352 | do |
353 | { | |
46a96992 | 354 | ret = waitpid (pid, statusp, flags); |
b957e937 DJ |
355 | } |
356 | while (ret == -1 && errno == EINTR); | |
357 | ||
358 | return ret; | |
359 | } | |
360 | ||
361 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
362 | ||
363 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
364 | we know that the feature is not available. This may change the tracing | |
365 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
366 | ||
367 | However, if it succeeds, we don't know for sure that the feature is | |
368 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 369 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
370 | fork tracing, and let it fork. If the process exits, we assume that we |
371 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
372 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
373 | |
374 | static void | |
b957e937 | 375 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
376 | { |
377 | int child_pid, ret, status; | |
378 | long second_pid; | |
7feb7d06 | 379 | sigset_t prev_mask; |
4c28f408 | 380 | |
7feb7d06 PA |
381 | /* We don't want those ptrace calls to be interrupted. */ |
382 | block_child_signals (&prev_mask); | |
3993f6b1 | 383 | |
b957e937 DJ |
384 | linux_supports_tracefork_flag = 0; |
385 | linux_supports_tracevforkdone_flag = 0; | |
386 | ||
387 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
388 | if (ret != 0) | |
7feb7d06 PA |
389 | { |
390 | restore_child_signals_mask (&prev_mask); | |
391 | return; | |
392 | } | |
b957e937 | 393 | |
3993f6b1 DJ |
394 | child_pid = fork (); |
395 | if (child_pid == -1) | |
e2e0b3e5 | 396 | perror_with_name (("fork")); |
3993f6b1 DJ |
397 | |
398 | if (child_pid == 0) | |
399 | linux_tracefork_child (); | |
400 | ||
b957e937 | 401 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 402 | if (ret == -1) |
e2e0b3e5 | 403 | perror_with_name (("waitpid")); |
3993f6b1 | 404 | else if (ret != child_pid) |
8a3fe4f8 | 405 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 406 | if (! WIFSTOPPED (status)) |
3e43a32a MS |
407 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), |
408 | status); | |
3993f6b1 | 409 | |
3993f6b1 DJ |
410 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
411 | if (ret != 0) | |
412 | { | |
b957e937 DJ |
413 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
414 | if (ret != 0) | |
415 | { | |
8a3fe4f8 | 416 | warning (_("linux_test_for_tracefork: failed to kill child")); |
7feb7d06 | 417 | restore_child_signals_mask (&prev_mask); |
b957e937 DJ |
418 | return; |
419 | } | |
420 | ||
421 | ret = my_waitpid (child_pid, &status, 0); | |
422 | if (ret != child_pid) | |
3e43a32a MS |
423 | warning (_("linux_test_for_tracefork: failed " |
424 | "to wait for killed child")); | |
b957e937 | 425 | else if (!WIFSIGNALED (status)) |
3e43a32a MS |
426 | warning (_("linux_test_for_tracefork: unexpected " |
427 | "wait status 0x%x from killed child"), status); | |
b957e937 | 428 | |
7feb7d06 | 429 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
430 | return; |
431 | } | |
432 | ||
9016a515 DJ |
433 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
434 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
435 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
436 | linux_supports_tracevforkdone_flag = (ret == 0); | |
437 | ||
b957e937 DJ |
438 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
439 | if (ret != 0) | |
8a3fe4f8 | 440 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
441 | |
442 | ret = my_waitpid (child_pid, &status, 0); | |
443 | ||
3993f6b1 DJ |
444 | if (ret == child_pid && WIFSTOPPED (status) |
445 | && status >> 16 == PTRACE_EVENT_FORK) | |
446 | { | |
447 | second_pid = 0; | |
448 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
449 | if (ret == 0 && second_pid != 0) | |
450 | { | |
451 | int second_status; | |
452 | ||
453 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
454 | my_waitpid (second_pid, &second_status, 0); |
455 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
456 | if (ret != 0) | |
3e43a32a MS |
457 | warning (_("linux_test_for_tracefork: " |
458 | "failed to kill second child")); | |
97725dc4 | 459 | my_waitpid (second_pid, &status, 0); |
3993f6b1 DJ |
460 | } |
461 | } | |
b957e937 | 462 | else |
8a3fe4f8 AC |
463 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
464 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 465 | |
b957e937 DJ |
466 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
467 | if (ret != 0) | |
8a3fe4f8 | 468 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 469 | my_waitpid (child_pid, &status, 0); |
4c28f408 | 470 | |
7feb7d06 | 471 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
472 | } |
473 | ||
a96d9b2e SDJ |
474 | /* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls. |
475 | ||
476 | We try to enable syscall tracing on ORIGINAL_PID. If this fails, | |
477 | we know that the feature is not available. This may change the tracing | |
478 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. */ | |
479 | ||
480 | static void | |
481 | linux_test_for_tracesysgood (int original_pid) | |
482 | { | |
483 | int ret; | |
484 | sigset_t prev_mask; | |
485 | ||
486 | /* We don't want those ptrace calls to be interrupted. */ | |
487 | block_child_signals (&prev_mask); | |
488 | ||
489 | linux_supports_tracesysgood_flag = 0; | |
490 | ||
491 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACESYSGOOD); | |
492 | if (ret != 0) | |
493 | goto out; | |
494 | ||
495 | linux_supports_tracesysgood_flag = 1; | |
496 | out: | |
497 | restore_child_signals_mask (&prev_mask); | |
498 | } | |
499 | ||
500 | /* Determine wether we support PTRACE_O_TRACESYSGOOD option available. | |
501 | This function also sets linux_supports_tracesysgood_flag. */ | |
502 | ||
503 | static int | |
504 | linux_supports_tracesysgood (int pid) | |
505 | { | |
506 | if (linux_supports_tracesysgood_flag == -1) | |
507 | linux_test_for_tracesysgood (pid); | |
508 | return linux_supports_tracesysgood_flag; | |
509 | } | |
510 | ||
3993f6b1 DJ |
511 | /* Return non-zero iff we have tracefork functionality available. |
512 | This function also sets linux_supports_tracefork_flag. */ | |
513 | ||
514 | static int | |
b957e937 | 515 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
516 | { |
517 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 518 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
519 | return linux_supports_tracefork_flag; |
520 | } | |
521 | ||
9016a515 | 522 | static int |
b957e937 | 523 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
524 | { |
525 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 526 | linux_test_for_tracefork (pid); |
9016a515 DJ |
527 | return linux_supports_tracevforkdone_flag; |
528 | } | |
529 | ||
a96d9b2e SDJ |
530 | static void |
531 | linux_enable_tracesysgood (ptid_t ptid) | |
532 | { | |
533 | int pid = ptid_get_lwp (ptid); | |
534 | ||
535 | if (pid == 0) | |
536 | pid = ptid_get_pid (ptid); | |
537 | ||
538 | if (linux_supports_tracesysgood (pid) == 0) | |
539 | return; | |
540 | ||
541 | current_ptrace_options |= PTRACE_O_TRACESYSGOOD; | |
542 | ||
543 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); | |
544 | } | |
545 | ||
3993f6b1 | 546 | \f |
4de4c07c DJ |
547 | void |
548 | linux_enable_event_reporting (ptid_t ptid) | |
549 | { | |
d3587048 | 550 | int pid = ptid_get_lwp (ptid); |
4de4c07c | 551 | |
d3587048 DJ |
552 | if (pid == 0) |
553 | pid = ptid_get_pid (ptid); | |
554 | ||
b957e937 | 555 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
556 | return; |
557 | ||
a96d9b2e SDJ |
558 | current_ptrace_options |= PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK |
559 | | PTRACE_O_TRACEEXEC | PTRACE_O_TRACECLONE; | |
560 | ||
b957e937 | 561 | if (linux_supports_tracevforkdone (pid)) |
a96d9b2e | 562 | current_ptrace_options |= PTRACE_O_TRACEVFORKDONE; |
9016a515 DJ |
563 | |
564 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
565 | read-only process state. */ | |
4de4c07c | 566 | |
a96d9b2e | 567 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); |
4de4c07c DJ |
568 | } |
569 | ||
6d8fd2b7 UW |
570 | static void |
571 | linux_child_post_attach (int pid) | |
4de4c07c DJ |
572 | { |
573 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
a96d9b2e | 574 | linux_enable_tracesysgood (pid_to_ptid (pid)); |
4de4c07c DJ |
575 | } |
576 | ||
10d6c8cd | 577 | static void |
4de4c07c DJ |
578 | linux_child_post_startup_inferior (ptid_t ptid) |
579 | { | |
580 | linux_enable_event_reporting (ptid); | |
a96d9b2e | 581 | linux_enable_tracesysgood (ptid); |
4de4c07c DJ |
582 | } |
583 | ||
6d8fd2b7 UW |
584 | static int |
585 | linux_child_follow_fork (struct target_ops *ops, int follow_child) | |
3993f6b1 | 586 | { |
7feb7d06 | 587 | sigset_t prev_mask; |
9016a515 | 588 | int has_vforked; |
4de4c07c DJ |
589 | int parent_pid, child_pid; |
590 | ||
7feb7d06 | 591 | block_child_signals (&prev_mask); |
b84876c2 | 592 | |
e58b0e63 PA |
593 | has_vforked = (inferior_thread ()->pending_follow.kind |
594 | == TARGET_WAITKIND_VFORKED); | |
595 | parent_pid = ptid_get_lwp (inferior_ptid); | |
d3587048 | 596 | if (parent_pid == 0) |
e58b0e63 PA |
597 | parent_pid = ptid_get_pid (inferior_ptid); |
598 | child_pid = PIDGET (inferior_thread ()->pending_follow.value.related_pid); | |
4de4c07c | 599 | |
2277426b PA |
600 | if (!detach_fork) |
601 | linux_enable_event_reporting (pid_to_ptid (child_pid)); | |
602 | ||
6c95b8df PA |
603 | if (has_vforked |
604 | && !non_stop /* Non-stop always resumes both branches. */ | |
605 | && (!target_is_async_p () || sync_execution) | |
606 | && !(follow_child || detach_fork || sched_multi)) | |
607 | { | |
608 | /* The parent stays blocked inside the vfork syscall until the | |
609 | child execs or exits. If we don't let the child run, then | |
610 | the parent stays blocked. If we're telling the parent to run | |
611 | in the foreground, the user will not be able to ctrl-c to get | |
612 | back the terminal, effectively hanging the debug session. */ | |
ac74f770 MS |
613 | fprintf_filtered (gdb_stderr, _("\ |
614 | Can not resume the parent process over vfork in the foreground while\n\ | |
615 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
616 | \"set schedule-multiple\".\n")); | |
617 | /* FIXME output string > 80 columns. */ | |
6c95b8df PA |
618 | return 1; |
619 | } | |
620 | ||
4de4c07c DJ |
621 | if (! follow_child) |
622 | { | |
6c95b8df | 623 | struct lwp_info *child_lp = NULL; |
4de4c07c | 624 | |
1777feb0 | 625 | /* We're already attached to the parent, by default. */ |
4de4c07c | 626 | |
ac264b3b MS |
627 | /* Detach new forked process? */ |
628 | if (detach_fork) | |
f75c00e4 | 629 | { |
6c95b8df PA |
630 | /* Before detaching from the child, remove all breakpoints |
631 | from it. If we forked, then this has already been taken | |
632 | care of by infrun.c. If we vforked however, any | |
633 | breakpoint inserted in the parent is visible in the | |
634 | child, even those added while stopped in a vfork | |
635 | catchpoint. This will remove the breakpoints from the | |
636 | parent also, but they'll be reinserted below. */ | |
637 | if (has_vforked) | |
638 | { | |
639 | /* keep breakpoints list in sync. */ | |
640 | remove_breakpoints_pid (GET_PID (inferior_ptid)); | |
641 | } | |
642 | ||
e85a822c | 643 | if (info_verbose || debug_linux_nat) |
ac264b3b MS |
644 | { |
645 | target_terminal_ours (); | |
646 | fprintf_filtered (gdb_stdlog, | |
3e43a32a MS |
647 | "Detaching after fork from " |
648 | "child process %d.\n", | |
ac264b3b MS |
649 | child_pid); |
650 | } | |
4de4c07c | 651 | |
ac264b3b MS |
652 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
653 | } | |
654 | else | |
655 | { | |
77435e4c | 656 | struct inferior *parent_inf, *child_inf; |
2277426b | 657 | struct cleanup *old_chain; |
7f9f62ba PA |
658 | |
659 | /* Add process to GDB's tables. */ | |
77435e4c PA |
660 | child_inf = add_inferior (child_pid); |
661 | ||
e58b0e63 | 662 | parent_inf = current_inferior (); |
77435e4c | 663 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 664 | copy_terminal_info (child_inf, parent_inf); |
7f9f62ba | 665 | |
2277426b | 666 | old_chain = save_inferior_ptid (); |
6c95b8df | 667 | save_current_program_space (); |
2277426b PA |
668 | |
669 | inferior_ptid = ptid_build (child_pid, child_pid, 0); | |
670 | add_thread (inferior_ptid); | |
6c95b8df PA |
671 | child_lp = add_lwp (inferior_ptid); |
672 | child_lp->stopped = 1; | |
25289eb2 | 673 | child_lp->last_resume_kind = resume_stop; |
2277426b | 674 | |
6c95b8df PA |
675 | /* If this is a vfork child, then the address-space is |
676 | shared with the parent. */ | |
677 | if (has_vforked) | |
678 | { | |
679 | child_inf->pspace = parent_inf->pspace; | |
680 | child_inf->aspace = parent_inf->aspace; | |
681 | ||
682 | /* The parent will be frozen until the child is done | |
683 | with the shared region. Keep track of the | |
684 | parent. */ | |
685 | child_inf->vfork_parent = parent_inf; | |
686 | child_inf->pending_detach = 0; | |
687 | parent_inf->vfork_child = child_inf; | |
688 | parent_inf->pending_detach = 0; | |
689 | } | |
690 | else | |
691 | { | |
692 | child_inf->aspace = new_address_space (); | |
693 | child_inf->pspace = add_program_space (child_inf->aspace); | |
694 | child_inf->removable = 1; | |
695 | set_current_program_space (child_inf->pspace); | |
696 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
697 | ||
698 | /* Let the shared library layer (solib-svr4) learn about | |
699 | this new process, relocate the cloned exec, pull in | |
700 | shared libraries, and install the solib event | |
701 | breakpoint. If a "cloned-VM" event was propagated | |
702 | better throughout the core, this wouldn't be | |
703 | required. */ | |
268a4a75 | 704 | solib_create_inferior_hook (0); |
6c95b8df PA |
705 | } |
706 | ||
707 | /* Let the thread_db layer learn about this new process. */ | |
2277426b PA |
708 | check_for_thread_db (); |
709 | ||
710 | do_cleanups (old_chain); | |
ac264b3b | 711 | } |
9016a515 DJ |
712 | |
713 | if (has_vforked) | |
714 | { | |
3ced3da4 | 715 | struct lwp_info *parent_lp; |
6c95b8df PA |
716 | struct inferior *parent_inf; |
717 | ||
718 | parent_inf = current_inferior (); | |
719 | ||
720 | /* If we detached from the child, then we have to be careful | |
721 | to not insert breakpoints in the parent until the child | |
722 | is done with the shared memory region. However, if we're | |
723 | staying attached to the child, then we can and should | |
724 | insert breakpoints, so that we can debug it. A | |
725 | subsequent child exec or exit is enough to know when does | |
726 | the child stops using the parent's address space. */ | |
727 | parent_inf->waiting_for_vfork_done = detach_fork; | |
56710373 | 728 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; |
6c95b8df | 729 | |
3ced3da4 | 730 | parent_lp = find_lwp_pid (pid_to_ptid (parent_pid)); |
b957e937 | 731 | gdb_assert (linux_supports_tracefork_flag >= 0); |
3ced3da4 | 732 | |
b957e937 | 733 | if (linux_supports_tracevforkdone (0)) |
9016a515 | 734 | { |
6c95b8df PA |
735 | if (debug_linux_nat) |
736 | fprintf_unfiltered (gdb_stdlog, | |
737 | "LCFF: waiting for VFORK_DONE on %d\n", | |
738 | parent_pid); | |
3ced3da4 | 739 | parent_lp->stopped = 1; |
9016a515 | 740 | |
6c95b8df PA |
741 | /* We'll handle the VFORK_DONE event like any other |
742 | event, in target_wait. */ | |
9016a515 DJ |
743 | } |
744 | else | |
745 | { | |
746 | /* We can't insert breakpoints until the child has | |
747 | finished with the shared memory region. We need to | |
748 | wait until that happens. Ideal would be to just | |
749 | call: | |
750 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
751 | - waitpid (parent_pid, &status, __WALL); | |
752 | However, most architectures can't handle a syscall | |
753 | being traced on the way out if it wasn't traced on | |
754 | the way in. | |
755 | ||
756 | We might also think to loop, continuing the child | |
757 | until it exits or gets a SIGTRAP. One problem is | |
758 | that the child might call ptrace with PTRACE_TRACEME. | |
759 | ||
760 | There's no simple and reliable way to figure out when | |
761 | the vforked child will be done with its copy of the | |
762 | shared memory. We could step it out of the syscall, | |
763 | two instructions, let it go, and then single-step the | |
764 | parent once. When we have hardware single-step, this | |
765 | would work; with software single-step it could still | |
766 | be made to work but we'd have to be able to insert | |
767 | single-step breakpoints in the child, and we'd have | |
768 | to insert -just- the single-step breakpoint in the | |
769 | parent. Very awkward. | |
770 | ||
771 | In the end, the best we can do is to make sure it | |
772 | runs for a little while. Hopefully it will be out of | |
773 | range of any breakpoints we reinsert. Usually this | |
774 | is only the single-step breakpoint at vfork's return | |
775 | point. */ | |
776 | ||
6c95b8df PA |
777 | if (debug_linux_nat) |
778 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
779 | "LCFF: no VFORK_DONE " |
780 | "support, sleeping a bit\n"); | |
6c95b8df | 781 | |
9016a515 | 782 | usleep (10000); |
9016a515 | 783 | |
6c95b8df PA |
784 | /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event, |
785 | and leave it pending. The next linux_nat_resume call | |
786 | will notice a pending event, and bypasses actually | |
787 | resuming the inferior. */ | |
3ced3da4 PA |
788 | parent_lp->status = 0; |
789 | parent_lp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
790 | parent_lp->stopped = 1; | |
6c95b8df PA |
791 | |
792 | /* If we're in async mode, need to tell the event loop | |
793 | there's something here to process. */ | |
794 | if (target_can_async_p ()) | |
795 | async_file_mark (); | |
796 | } | |
9016a515 | 797 | } |
4de4c07c | 798 | } |
3993f6b1 | 799 | else |
4de4c07c | 800 | { |
77435e4c | 801 | struct inferior *parent_inf, *child_inf; |
3ced3da4 | 802 | struct lwp_info *child_lp; |
6c95b8df | 803 | struct program_space *parent_pspace; |
4de4c07c | 804 | |
e85a822c | 805 | if (info_verbose || debug_linux_nat) |
f75c00e4 DJ |
806 | { |
807 | target_terminal_ours (); | |
6c95b8df | 808 | if (has_vforked) |
3e43a32a MS |
809 | fprintf_filtered (gdb_stdlog, |
810 | _("Attaching after process %d " | |
811 | "vfork to child process %d.\n"), | |
6c95b8df PA |
812 | parent_pid, child_pid); |
813 | else | |
3e43a32a MS |
814 | fprintf_filtered (gdb_stdlog, |
815 | _("Attaching after process %d " | |
816 | "fork to child process %d.\n"), | |
6c95b8df | 817 | parent_pid, child_pid); |
f75c00e4 | 818 | } |
4de4c07c | 819 | |
7a7d3353 PA |
820 | /* Add the new inferior first, so that the target_detach below |
821 | doesn't unpush the target. */ | |
822 | ||
77435e4c PA |
823 | child_inf = add_inferior (child_pid); |
824 | ||
e58b0e63 | 825 | parent_inf = current_inferior (); |
77435e4c | 826 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 827 | copy_terminal_info (child_inf, parent_inf); |
7a7d3353 | 828 | |
6c95b8df | 829 | parent_pspace = parent_inf->pspace; |
9016a515 | 830 | |
6c95b8df PA |
831 | /* If we're vforking, we want to hold on to the parent until the |
832 | child exits or execs. At child exec or exit time we can | |
833 | remove the old breakpoints from the parent and detach or | |
834 | resume debugging it. Otherwise, detach the parent now; we'll | |
835 | want to reuse it's program/address spaces, but we can't set | |
836 | them to the child before removing breakpoints from the | |
837 | parent, otherwise, the breakpoints module could decide to | |
838 | remove breakpoints from the wrong process (since they'd be | |
839 | assigned to the same address space). */ | |
9016a515 DJ |
840 | |
841 | if (has_vforked) | |
7f9f62ba | 842 | { |
6c95b8df PA |
843 | gdb_assert (child_inf->vfork_parent == NULL); |
844 | gdb_assert (parent_inf->vfork_child == NULL); | |
845 | child_inf->vfork_parent = parent_inf; | |
846 | child_inf->pending_detach = 0; | |
847 | parent_inf->vfork_child = child_inf; | |
848 | parent_inf->pending_detach = detach_fork; | |
849 | parent_inf->waiting_for_vfork_done = 0; | |
ac264b3b | 850 | } |
2277426b | 851 | else if (detach_fork) |
b84876c2 | 852 | target_detach (NULL, 0); |
4de4c07c | 853 | |
6c95b8df PA |
854 | /* Note that the detach above makes PARENT_INF dangling. */ |
855 | ||
856 | /* Add the child thread to the appropriate lists, and switch to | |
857 | this new thread, before cloning the program space, and | |
858 | informing the solib layer about this new process. */ | |
859 | ||
9f0bdab8 | 860 | inferior_ptid = ptid_build (child_pid, child_pid, 0); |
2277426b | 861 | add_thread (inferior_ptid); |
3ced3da4 PA |
862 | child_lp = add_lwp (inferior_ptid); |
863 | child_lp->stopped = 1; | |
25289eb2 | 864 | child_lp->last_resume_kind = resume_stop; |
6c95b8df PA |
865 | |
866 | /* If this is a vfork child, then the address-space is shared | |
867 | with the parent. If we detached from the parent, then we can | |
868 | reuse the parent's program/address spaces. */ | |
869 | if (has_vforked || detach_fork) | |
870 | { | |
871 | child_inf->pspace = parent_pspace; | |
872 | child_inf->aspace = child_inf->pspace->aspace; | |
873 | } | |
874 | else | |
875 | { | |
876 | child_inf->aspace = new_address_space (); | |
877 | child_inf->pspace = add_program_space (child_inf->aspace); | |
878 | child_inf->removable = 1; | |
879 | set_current_program_space (child_inf->pspace); | |
880 | clone_program_space (child_inf->pspace, parent_pspace); | |
881 | ||
882 | /* Let the shared library layer (solib-svr4) learn about | |
883 | this new process, relocate the cloned exec, pull in | |
884 | shared libraries, and install the solib event breakpoint. | |
885 | If a "cloned-VM" event was propagated better throughout | |
886 | the core, this wouldn't be required. */ | |
268a4a75 | 887 | solib_create_inferior_hook (0); |
6c95b8df | 888 | } |
ac264b3b | 889 | |
6c95b8df | 890 | /* Let the thread_db layer learn about this new process. */ |
ef29ce1a | 891 | check_for_thread_db (); |
4de4c07c DJ |
892 | } |
893 | ||
7feb7d06 | 894 | restore_child_signals_mask (&prev_mask); |
4de4c07c DJ |
895 | return 0; |
896 | } | |
897 | ||
4de4c07c | 898 | \f |
77b06cd7 | 899 | static int |
6d8fd2b7 | 900 | linux_child_insert_fork_catchpoint (int pid) |
4de4c07c | 901 | { |
77b06cd7 | 902 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
903 | } |
904 | ||
eb73ad13 PA |
905 | static int |
906 | linux_child_remove_fork_catchpoint (int pid) | |
907 | { | |
908 | return 0; | |
909 | } | |
910 | ||
77b06cd7 | 911 | static int |
6d8fd2b7 | 912 | linux_child_insert_vfork_catchpoint (int pid) |
3993f6b1 | 913 | { |
77b06cd7 | 914 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
915 | } |
916 | ||
eb73ad13 PA |
917 | static int |
918 | linux_child_remove_vfork_catchpoint (int pid) | |
919 | { | |
920 | return 0; | |
921 | } | |
922 | ||
77b06cd7 | 923 | static int |
6d8fd2b7 | 924 | linux_child_insert_exec_catchpoint (int pid) |
3993f6b1 | 925 | { |
77b06cd7 | 926 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
927 | } |
928 | ||
eb73ad13 PA |
929 | static int |
930 | linux_child_remove_exec_catchpoint (int pid) | |
931 | { | |
932 | return 0; | |
933 | } | |
934 | ||
a96d9b2e SDJ |
935 | static int |
936 | linux_child_set_syscall_catchpoint (int pid, int needed, int any_count, | |
937 | int table_size, int *table) | |
938 | { | |
77b06cd7 TJB |
939 | if (!linux_supports_tracesysgood (pid)) |
940 | return 1; | |
941 | ||
a96d9b2e SDJ |
942 | /* On GNU/Linux, we ignore the arguments. It means that we only |
943 | enable the syscall catchpoints, but do not disable them. | |
77b06cd7 | 944 | |
a96d9b2e SDJ |
945 | Also, we do not use the `table' information because we do not |
946 | filter system calls here. We let GDB do the logic for us. */ | |
947 | return 0; | |
948 | } | |
949 | ||
d6b0e80f AC |
950 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's |
951 | are processes sharing the same VM space. A multi-threaded process | |
952 | is basically a group of such processes. However, such a grouping | |
953 | is almost entirely a user-space issue; the kernel doesn't enforce | |
954 | such a grouping at all (this might change in the future). In | |
955 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
956 | Threads library) to provide such a grouping. | |
957 | ||
958 | It is perfectly well possible to write a multi-threaded application | |
959 | without the assistance of a threads library, by using the clone | |
960 | system call directly. This module should be able to give some | |
961 | rudimentary support for debugging such applications if developers | |
962 | specify the CLONE_PTRACE flag in the clone system call, and are | |
963 | using the Linux kernel 2.4 or above. | |
964 | ||
965 | Note that there are some peculiarities in GNU/Linux that affect | |
966 | this code: | |
967 | ||
968 | - In general one should specify the __WCLONE flag to waitpid in | |
969 | order to make it report events for any of the cloned processes | |
970 | (and leave it out for the initial process). However, if a cloned | |
971 | process has exited the exit status is only reported if the | |
972 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
973 | we cannot use it since GDB must work on older systems too. | |
974 | ||
975 | - When a traced, cloned process exits and is waited for by the | |
976 | debugger, the kernel reassigns it to the original parent and | |
977 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
978 | library doesn't notice this, which leads to the "zombie problem": | |
979 | When debugged a multi-threaded process that spawns a lot of | |
980 | threads will run out of processes, even if the threads exit, | |
981 | because the "zombies" stay around. */ | |
982 | ||
983 | /* List of known LWPs. */ | |
9f0bdab8 | 984 | struct lwp_info *lwp_list; |
d6b0e80f AC |
985 | \f |
986 | ||
d6b0e80f AC |
987 | /* Original signal mask. */ |
988 | static sigset_t normal_mask; | |
989 | ||
990 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
991 | _initialize_linux_nat. */ | |
992 | static sigset_t suspend_mask; | |
993 | ||
7feb7d06 PA |
994 | /* Signals to block to make that sigsuspend work. */ |
995 | static sigset_t blocked_mask; | |
996 | ||
997 | /* SIGCHLD action. */ | |
998 | struct sigaction sigchld_action; | |
b84876c2 | 999 | |
7feb7d06 PA |
1000 | /* Block child signals (SIGCHLD and linux threads signals), and store |
1001 | the previous mask in PREV_MASK. */ | |
84e46146 | 1002 | |
7feb7d06 PA |
1003 | static void |
1004 | block_child_signals (sigset_t *prev_mask) | |
1005 | { | |
1006 | /* Make sure SIGCHLD is blocked. */ | |
1007 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
1008 | sigaddset (&blocked_mask, SIGCHLD); | |
1009 | ||
1010 | sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask); | |
1011 | } | |
1012 | ||
1013 | /* Restore child signals mask, previously returned by | |
1014 | block_child_signals. */ | |
1015 | ||
1016 | static void | |
1017 | restore_child_signals_mask (sigset_t *prev_mask) | |
1018 | { | |
1019 | sigprocmask (SIG_SETMASK, prev_mask, NULL); | |
1020 | } | |
2455069d UW |
1021 | |
1022 | /* Mask of signals to pass directly to the inferior. */ | |
1023 | static sigset_t pass_mask; | |
1024 | ||
1025 | /* Update signals to pass to the inferior. */ | |
1026 | static void | |
1027 | linux_nat_pass_signals (int numsigs, unsigned char *pass_signals) | |
1028 | { | |
1029 | int signo; | |
1030 | ||
1031 | sigemptyset (&pass_mask); | |
1032 | ||
1033 | for (signo = 1; signo < NSIG; signo++) | |
1034 | { | |
1035 | int target_signo = target_signal_from_host (signo); | |
1036 | if (target_signo < numsigs && pass_signals[target_signo]) | |
1037 | sigaddset (&pass_mask, signo); | |
1038 | } | |
1039 | } | |
1040 | ||
d6b0e80f AC |
1041 | \f |
1042 | ||
1043 | /* Prototypes for local functions. */ | |
1044 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
28439f5e | 1045 | static int linux_thread_alive (ptid_t ptid); |
6d8fd2b7 | 1046 | static char *linux_child_pid_to_exec_file (int pid); |
710151dd | 1047 | |
d6b0e80f AC |
1048 | \f |
1049 | /* Convert wait status STATUS to a string. Used for printing debug | |
1050 | messages only. */ | |
1051 | ||
1052 | static char * | |
1053 | status_to_str (int status) | |
1054 | { | |
1055 | static char buf[64]; | |
1056 | ||
1057 | if (WIFSTOPPED (status)) | |
206aa767 | 1058 | { |
ca2163eb | 1059 | if (WSTOPSIG (status) == SYSCALL_SIGTRAP) |
206aa767 DE |
1060 | snprintf (buf, sizeof (buf), "%s (stopped at syscall)", |
1061 | strsignal (SIGTRAP)); | |
1062 | else | |
1063 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
1064 | strsignal (WSTOPSIG (status))); | |
1065 | } | |
d6b0e80f AC |
1066 | else if (WIFSIGNALED (status)) |
1067 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
ba9b2ec3 | 1068 | strsignal (WTERMSIG (status))); |
d6b0e80f AC |
1069 | else |
1070 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
1071 | ||
1072 | return buf; | |
1073 | } | |
1074 | ||
d90e17a7 PA |
1075 | /* Remove all LWPs belong to PID from the lwp list. */ |
1076 | ||
1077 | static void | |
1078 | purge_lwp_list (int pid) | |
1079 | { | |
1080 | struct lwp_info *lp, *lpprev, *lpnext; | |
1081 | ||
1082 | lpprev = NULL; | |
1083 | ||
1084 | for (lp = lwp_list; lp; lp = lpnext) | |
1085 | { | |
1086 | lpnext = lp->next; | |
1087 | ||
1088 | if (ptid_get_pid (lp->ptid) == pid) | |
1089 | { | |
1090 | if (lp == lwp_list) | |
1091 | lwp_list = lp->next; | |
1092 | else | |
1093 | lpprev->next = lp->next; | |
1094 | ||
1095 | xfree (lp); | |
1096 | } | |
1097 | else | |
1098 | lpprev = lp; | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | /* Return the number of known LWPs in the tgid given by PID. */ | |
1103 | ||
1104 | static int | |
1105 | num_lwps (int pid) | |
1106 | { | |
1107 | int count = 0; | |
1108 | struct lwp_info *lp; | |
1109 | ||
1110 | for (lp = lwp_list; lp; lp = lp->next) | |
1111 | if (ptid_get_pid (lp->ptid) == pid) | |
1112 | count++; | |
1113 | ||
1114 | return count; | |
d6b0e80f AC |
1115 | } |
1116 | ||
f973ed9c | 1117 | /* Add the LWP specified by PID to the list. Return a pointer to the |
9f0bdab8 DJ |
1118 | structure describing the new LWP. The LWP should already be stopped |
1119 | (with an exception for the very first LWP). */ | |
d6b0e80f AC |
1120 | |
1121 | static struct lwp_info * | |
1122 | add_lwp (ptid_t ptid) | |
1123 | { | |
1124 | struct lwp_info *lp; | |
1125 | ||
1126 | gdb_assert (is_lwp (ptid)); | |
1127 | ||
1128 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
1129 | ||
1130 | memset (lp, 0, sizeof (struct lwp_info)); | |
1131 | ||
25289eb2 | 1132 | lp->last_resume_kind = resume_continue; |
d6b0e80f AC |
1133 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; |
1134 | ||
1135 | lp->ptid = ptid; | |
dc146f7c | 1136 | lp->core = -1; |
d6b0e80f AC |
1137 | |
1138 | lp->next = lwp_list; | |
1139 | lwp_list = lp; | |
d6b0e80f | 1140 | |
d90e17a7 | 1141 | if (num_lwps (GET_PID (ptid)) > 1 && linux_nat_new_thread != NULL) |
9f0bdab8 DJ |
1142 | linux_nat_new_thread (ptid); |
1143 | ||
d6b0e80f AC |
1144 | return lp; |
1145 | } | |
1146 | ||
1147 | /* Remove the LWP specified by PID from the list. */ | |
1148 | ||
1149 | static void | |
1150 | delete_lwp (ptid_t ptid) | |
1151 | { | |
1152 | struct lwp_info *lp, *lpprev; | |
1153 | ||
1154 | lpprev = NULL; | |
1155 | ||
1156 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
1157 | if (ptid_equal (lp->ptid, ptid)) | |
1158 | break; | |
1159 | ||
1160 | if (!lp) | |
1161 | return; | |
1162 | ||
d6b0e80f AC |
1163 | if (lpprev) |
1164 | lpprev->next = lp->next; | |
1165 | else | |
1166 | lwp_list = lp->next; | |
1167 | ||
1168 | xfree (lp); | |
1169 | } | |
1170 | ||
1171 | /* Return a pointer to the structure describing the LWP corresponding | |
1172 | to PID. If no corresponding LWP could be found, return NULL. */ | |
1173 | ||
1174 | static struct lwp_info * | |
1175 | find_lwp_pid (ptid_t ptid) | |
1176 | { | |
1177 | struct lwp_info *lp; | |
1178 | int lwp; | |
1179 | ||
1180 | if (is_lwp (ptid)) | |
1181 | lwp = GET_LWP (ptid); | |
1182 | else | |
1183 | lwp = GET_PID (ptid); | |
1184 | ||
1185 | for (lp = lwp_list; lp; lp = lp->next) | |
1186 | if (lwp == GET_LWP (lp->ptid)) | |
1187 | return lp; | |
1188 | ||
1189 | return NULL; | |
1190 | } | |
1191 | ||
1192 | /* Call CALLBACK with its second argument set to DATA for every LWP in | |
1193 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1194 | pointer to the structure describing that LWP immediately. | |
1195 | Otherwise return NULL. */ | |
1196 | ||
1197 | struct lwp_info * | |
d90e17a7 PA |
1198 | iterate_over_lwps (ptid_t filter, |
1199 | int (*callback) (struct lwp_info *, void *), | |
1200 | void *data) | |
d6b0e80f AC |
1201 | { |
1202 | struct lwp_info *lp, *lpnext; | |
1203 | ||
1204 | for (lp = lwp_list; lp; lp = lpnext) | |
1205 | { | |
1206 | lpnext = lp->next; | |
d90e17a7 PA |
1207 | |
1208 | if (ptid_match (lp->ptid, filter)) | |
1209 | { | |
1210 | if ((*callback) (lp, data)) | |
1211 | return lp; | |
1212 | } | |
d6b0e80f AC |
1213 | } |
1214 | ||
1215 | return NULL; | |
1216 | } | |
1217 | ||
2277426b PA |
1218 | /* Update our internal state when changing from one checkpoint to |
1219 | another indicated by NEW_PTID. We can only switch single-threaded | |
1220 | applications, so we only create one new LWP, and the previous list | |
1221 | is discarded. */ | |
f973ed9c DJ |
1222 | |
1223 | void | |
1224 | linux_nat_switch_fork (ptid_t new_ptid) | |
1225 | { | |
1226 | struct lwp_info *lp; | |
1227 | ||
2277426b PA |
1228 | purge_lwp_list (GET_PID (inferior_ptid)); |
1229 | ||
f973ed9c DJ |
1230 | lp = add_lwp (new_ptid); |
1231 | lp->stopped = 1; | |
e26af52f | 1232 | |
2277426b PA |
1233 | /* This changes the thread's ptid while preserving the gdb thread |
1234 | num. Also changes the inferior pid, while preserving the | |
1235 | inferior num. */ | |
1236 | thread_change_ptid (inferior_ptid, new_ptid); | |
1237 | ||
1238 | /* We've just told GDB core that the thread changed target id, but, | |
1239 | in fact, it really is a different thread, with different register | |
1240 | contents. */ | |
1241 | registers_changed (); | |
e26af52f DJ |
1242 | } |
1243 | ||
e26af52f DJ |
1244 | /* Handle the exit of a single thread LP. */ |
1245 | ||
1246 | static void | |
1247 | exit_lwp (struct lwp_info *lp) | |
1248 | { | |
e09875d4 | 1249 | struct thread_info *th = find_thread_ptid (lp->ptid); |
063bfe2e VP |
1250 | |
1251 | if (th) | |
e26af52f | 1252 | { |
17faa917 DJ |
1253 | if (print_thread_events) |
1254 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1255 | ||
4f8d22e3 | 1256 | delete_thread (lp->ptid); |
e26af52f DJ |
1257 | } |
1258 | ||
1259 | delete_lwp (lp->ptid); | |
1260 | } | |
1261 | ||
a0ef4274 DJ |
1262 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1263 | Other states including `T (tracing stop)' are reported as false. */ | |
1264 | ||
1265 | static int | |
1266 | pid_is_stopped (pid_t pid) | |
1267 | { | |
1268 | FILE *status_file; | |
1269 | char buf[100]; | |
1270 | int retval = 0; | |
1271 | ||
1272 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1273 | status_file = fopen (buf, "r"); | |
1274 | if (status_file != NULL) | |
1275 | { | |
1276 | int have_state = 0; | |
1277 | ||
1278 | while (fgets (buf, sizeof (buf), status_file)) | |
1279 | { | |
1280 | if (strncmp (buf, "State:", 6) == 0) | |
1281 | { | |
1282 | have_state = 1; | |
1283 | break; | |
1284 | } | |
1285 | } | |
1286 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1287 | retval = 1; | |
1288 | fclose (status_file); | |
1289 | } | |
1290 | return retval; | |
1291 | } | |
1292 | ||
1293 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1294 | Returns a wait status for that LWP, to cache. */ | |
1295 | ||
1296 | static int | |
1297 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1298 | int *signalled) | |
1299 | { | |
1300 | pid_t new_pid, pid = GET_LWP (ptid); | |
1301 | int status; | |
1302 | ||
1303 | if (pid_is_stopped (pid)) | |
1304 | { | |
1305 | if (debug_linux_nat) | |
1306 | fprintf_unfiltered (gdb_stdlog, | |
1307 | "LNPAW: Attaching to a stopped process\n"); | |
1308 | ||
1309 | /* The process is definitely stopped. It is in a job control | |
1310 | stop, unless the kernel predates the TASK_STOPPED / | |
1311 | TASK_TRACED distinction, in which case it might be in a | |
1312 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1313 | can kill it, signal it, et cetera. | |
1314 | ||
1315 | First make sure there is a pending SIGSTOP. Since we are | |
1316 | already attached, the process can not transition from stopped | |
1317 | to running without a PTRACE_CONT; so we know this signal will | |
1318 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1319 | probably already in the queue (unless this kernel is old | |
1320 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1321 | is not an RT signal, it can only be queued once. */ | |
1322 | kill_lwp (pid, SIGSTOP); | |
1323 | ||
1324 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1325 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1326 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1327 | } | |
1328 | ||
1329 | /* Make sure the initial process is stopped. The user-level threads | |
1330 | layer might want to poke around in the inferior, and that won't | |
1331 | work if things haven't stabilized yet. */ | |
1332 | new_pid = my_waitpid (pid, &status, 0); | |
1333 | if (new_pid == -1 && errno == ECHILD) | |
1334 | { | |
1335 | if (first) | |
1336 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1337 | ||
1338 | /* Try again with __WCLONE to check cloned processes. */ | |
1339 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1340 | *cloned = 1; | |
1341 | } | |
1342 | ||
dacc9cb2 PP |
1343 | gdb_assert (pid == new_pid); |
1344 | ||
1345 | if (!WIFSTOPPED (status)) | |
1346 | { | |
1347 | /* The pid we tried to attach has apparently just exited. */ | |
1348 | if (debug_linux_nat) | |
1349 | fprintf_unfiltered (gdb_stdlog, "LNPAW: Failed to stop %d: %s", | |
1350 | pid, status_to_str (status)); | |
1351 | return status; | |
1352 | } | |
a0ef4274 DJ |
1353 | |
1354 | if (WSTOPSIG (status) != SIGSTOP) | |
1355 | { | |
1356 | *signalled = 1; | |
1357 | if (debug_linux_nat) | |
1358 | fprintf_unfiltered (gdb_stdlog, | |
1359 | "LNPAW: Received %s after attaching\n", | |
1360 | status_to_str (status)); | |
1361 | } | |
1362 | ||
1363 | return status; | |
1364 | } | |
1365 | ||
84636d28 PA |
1366 | /* Attach to the LWP specified by PID. Return 0 if successful, -1 if |
1367 | the new LWP could not be attached, or 1 if we're already auto | |
1368 | attached to this thread, but haven't processed the | |
1369 | PTRACE_EVENT_CLONE event of its parent thread, so we just ignore | |
1370 | its existance, without considering it an error. */ | |
d6b0e80f | 1371 | |
9ee57c33 | 1372 | int |
93815fbf | 1373 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1374 | { |
9ee57c33 | 1375 | struct lwp_info *lp; |
7feb7d06 | 1376 | sigset_t prev_mask; |
84636d28 | 1377 | int lwpid; |
d6b0e80f AC |
1378 | |
1379 | gdb_assert (is_lwp (ptid)); | |
1380 | ||
7feb7d06 | 1381 | block_child_signals (&prev_mask); |
d6b0e80f | 1382 | |
9ee57c33 | 1383 | lp = find_lwp_pid (ptid); |
84636d28 | 1384 | lwpid = GET_LWP (ptid); |
d6b0e80f AC |
1385 | |
1386 | /* We assume that we're already attached to any LWP that has an id | |
1387 | equal to the overall process id, and to any LWP that is already | |
1388 | in our list of LWPs. If we're not seeing exit events from threads | |
1389 | and we've had PID wraparound since we last tried to stop all threads, | |
1390 | this assumption might be wrong; fortunately, this is very unlikely | |
1391 | to happen. */ | |
84636d28 | 1392 | if (lwpid != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1393 | { |
a0ef4274 | 1394 | int status, cloned = 0, signalled = 0; |
d6b0e80f | 1395 | |
84636d28 | 1396 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) < 0) |
9ee57c33 | 1397 | { |
84636d28 PA |
1398 | if (linux_supports_tracefork_flag) |
1399 | { | |
1400 | /* If we haven't stopped all threads when we get here, | |
1401 | we may have seen a thread listed in thread_db's list, | |
1402 | but not processed the PTRACE_EVENT_CLONE yet. If | |
1403 | that's the case, ignore this new thread, and let | |
1404 | normal event handling discover it later. */ | |
1405 | if (in_pid_list_p (stopped_pids, lwpid)) | |
1406 | { | |
1407 | /* We've already seen this thread stop, but we | |
1408 | haven't seen the PTRACE_EVENT_CLONE extended | |
1409 | event yet. */ | |
1410 | restore_child_signals_mask (&prev_mask); | |
1411 | return 0; | |
1412 | } | |
1413 | else | |
1414 | { | |
1415 | int new_pid; | |
1416 | int status; | |
1417 | ||
1418 | /* See if we've got a stop for this new child | |
1419 | pending. If so, we're already attached. */ | |
1420 | new_pid = my_waitpid (lwpid, &status, WNOHANG); | |
1421 | if (new_pid == -1 && errno == ECHILD) | |
1422 | new_pid = my_waitpid (lwpid, &status, __WCLONE | WNOHANG); | |
1423 | if (new_pid != -1) | |
1424 | { | |
1425 | if (WIFSTOPPED (status)) | |
1426 | add_to_pid_list (&stopped_pids, lwpid, status); | |
1427 | ||
1428 | restore_child_signals_mask (&prev_mask); | |
1429 | return 1; | |
1430 | } | |
1431 | } | |
1432 | } | |
1433 | ||
9ee57c33 DJ |
1434 | /* If we fail to attach to the thread, issue a warning, |
1435 | but continue. One way this can happen is if thread | |
e9efe249 | 1436 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1437 | bug may place threads in the thread list and then fail |
1438 | to create them. */ | |
1439 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1440 | safe_strerror (errno)); | |
7feb7d06 | 1441 | restore_child_signals_mask (&prev_mask); |
9ee57c33 DJ |
1442 | return -1; |
1443 | } | |
1444 | ||
d6b0e80f AC |
1445 | if (debug_linux_nat) |
1446 | fprintf_unfiltered (gdb_stdlog, | |
1447 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1448 | target_pid_to_str (ptid)); | |
1449 | ||
a0ef4274 | 1450 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
dacc9cb2 | 1451 | if (!WIFSTOPPED (status)) |
673c2bbe DE |
1452 | { |
1453 | restore_child_signals_mask (&prev_mask); | |
f687d035 | 1454 | return 1; |
673c2bbe | 1455 | } |
dacc9cb2 | 1456 | |
a0ef4274 DJ |
1457 | lp = add_lwp (ptid); |
1458 | lp->stopped = 1; | |
1459 | lp->cloned = cloned; | |
1460 | lp->signalled = signalled; | |
1461 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1462 | { |
a0ef4274 DJ |
1463 | lp->resumed = 1; |
1464 | lp->status = status; | |
d6b0e80f AC |
1465 | } |
1466 | ||
a0ef4274 | 1467 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1468 | |
1469 | if (debug_linux_nat) | |
1470 | { | |
1471 | fprintf_unfiltered (gdb_stdlog, | |
1472 | "LLAL: waitpid %s received %s\n", | |
1473 | target_pid_to_str (ptid), | |
1474 | status_to_str (status)); | |
1475 | } | |
1476 | } | |
1477 | else | |
1478 | { | |
1479 | /* We assume that the LWP representing the original process is | |
1480 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1481 | that the GNU/linux ptrace layer uses to keep track of |
1482 | threads. Note that this won't have already been done since | |
1483 | the main thread will have, we assume, been stopped by an | |
1484 | attach from a different layer. */ | |
9ee57c33 DJ |
1485 | if (lp == NULL) |
1486 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1487 | lp->stopped = 1; |
1488 | } | |
9ee57c33 | 1489 | |
25289eb2 | 1490 | lp->last_resume_kind = resume_stop; |
7feb7d06 | 1491 | restore_child_signals_mask (&prev_mask); |
9ee57c33 | 1492 | return 0; |
d6b0e80f AC |
1493 | } |
1494 | ||
b84876c2 | 1495 | static void |
136d6dae VP |
1496 | linux_nat_create_inferior (struct target_ops *ops, |
1497 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1498 | int from_tty) |
1499 | { | |
10568435 JK |
1500 | #ifdef HAVE_PERSONALITY |
1501 | int personality_orig = 0, personality_set = 0; | |
1502 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1503 | |
1504 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1505 | we have to mask the async mode. */ | |
1506 | ||
10568435 JK |
1507 | #ifdef HAVE_PERSONALITY |
1508 | if (disable_randomization) | |
1509 | { | |
1510 | errno = 0; | |
1511 | personality_orig = personality (0xffffffff); | |
1512 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1513 | { | |
1514 | personality_set = 1; | |
1515 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1516 | } | |
1517 | if (errno != 0 || (personality_set | |
1518 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1519 | warning (_("Error disabling address space randomization: %s"), | |
1520 | safe_strerror (errno)); | |
1521 | } | |
1522 | #endif /* HAVE_PERSONALITY */ | |
1523 | ||
2455069d UW |
1524 | /* Make sure we report all signals during startup. */ |
1525 | linux_nat_pass_signals (0, NULL); | |
1526 | ||
136d6dae | 1527 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1528 | |
10568435 JK |
1529 | #ifdef HAVE_PERSONALITY |
1530 | if (personality_set) | |
1531 | { | |
1532 | errno = 0; | |
1533 | personality (personality_orig); | |
1534 | if (errno != 0) | |
1535 | warning (_("Error restoring address space randomization: %s"), | |
1536 | safe_strerror (errno)); | |
1537 | } | |
1538 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1539 | } |
1540 | ||
d6b0e80f | 1541 | static void |
136d6dae | 1542 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1543 | { |
1544 | struct lwp_info *lp; | |
d6b0e80f | 1545 | int status; |
af990527 | 1546 | ptid_t ptid; |
d6b0e80f | 1547 | |
2455069d UW |
1548 | /* Make sure we report all signals during attach. */ |
1549 | linux_nat_pass_signals (0, NULL); | |
1550 | ||
136d6dae | 1551 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1552 | |
af990527 PA |
1553 | /* The ptrace base target adds the main thread with (pid,0,0) |
1554 | format. Decorate it with lwp info. */ | |
1555 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1556 | thread_change_ptid (inferior_ptid, ptid); | |
1557 | ||
9f0bdab8 | 1558 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1559 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1560 | |
1561 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1562 | &lp->signalled); | |
dacc9cb2 PP |
1563 | if (!WIFSTOPPED (status)) |
1564 | { | |
1565 | if (WIFEXITED (status)) | |
1566 | { | |
1567 | int exit_code = WEXITSTATUS (status); | |
1568 | ||
1569 | target_terminal_ours (); | |
1570 | target_mourn_inferior (); | |
1571 | if (exit_code == 0) | |
1572 | error (_("Unable to attach: program exited normally.")); | |
1573 | else | |
1574 | error (_("Unable to attach: program exited with code %d."), | |
1575 | exit_code); | |
1576 | } | |
1577 | else if (WIFSIGNALED (status)) | |
1578 | { | |
1579 | enum target_signal signo; | |
1580 | ||
1581 | target_terminal_ours (); | |
1582 | target_mourn_inferior (); | |
1583 | ||
1584 | signo = target_signal_from_host (WTERMSIG (status)); | |
1585 | error (_("Unable to attach: program terminated with signal " | |
1586 | "%s, %s."), | |
1587 | target_signal_to_name (signo), | |
1588 | target_signal_to_string (signo)); | |
1589 | } | |
1590 | ||
1591 | internal_error (__FILE__, __LINE__, | |
1592 | _("unexpected status %d for PID %ld"), | |
1593 | status, (long) GET_LWP (ptid)); | |
1594 | } | |
1595 | ||
a0ef4274 | 1596 | lp->stopped = 1; |
9f0bdab8 | 1597 | |
a0ef4274 | 1598 | /* Save the wait status to report later. */ |
d6b0e80f | 1599 | lp->resumed = 1; |
a0ef4274 DJ |
1600 | if (debug_linux_nat) |
1601 | fprintf_unfiltered (gdb_stdlog, | |
1602 | "LNA: waitpid %ld, saving status %s\n", | |
1603 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd | 1604 | |
7feb7d06 PA |
1605 | lp->status = status; |
1606 | ||
1607 | if (target_can_async_p ()) | |
1608 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1609 | } |
1610 | ||
a0ef4274 DJ |
1611 | /* Get pending status of LP. */ |
1612 | static int | |
1613 | get_pending_status (struct lwp_info *lp, int *status) | |
1614 | { | |
ca2163eb PA |
1615 | enum target_signal signo = TARGET_SIGNAL_0; |
1616 | ||
1617 | /* If we paused threads momentarily, we may have stored pending | |
1618 | events in lp->status or lp->waitstatus (see stop_wait_callback), | |
1619 | and GDB core hasn't seen any signal for those threads. | |
1620 | Otherwise, the last signal reported to the core is found in the | |
1621 | thread object's stop_signal. | |
1622 | ||
1623 | There's a corner case that isn't handled here at present. Only | |
1624 | if the thread stopped with a TARGET_WAITKIND_STOPPED does | |
1625 | stop_signal make sense as a real signal to pass to the inferior. | |
1626 | Some catchpoint related events, like | |
1627 | TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set | |
1628 | to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But, | |
1629 | those traps are debug API (ptrace in our case) related and | |
1630 | induced; the inferior wouldn't see them if it wasn't being | |
1631 | traced. Hence, we should never pass them to the inferior, even | |
1632 | when set to pass state. Since this corner case isn't handled by | |
1633 | infrun.c when proceeding with a signal, for consistency, neither | |
1634 | do we handle it here (or elsewhere in the file we check for | |
1635 | signal pass state). Normally SIGTRAP isn't set to pass state, so | |
1636 | this is really a corner case. */ | |
1637 | ||
1638 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
1639 | signo = TARGET_SIGNAL_0; /* a pending ptrace event, not a real signal. */ | |
1640 | else if (lp->status) | |
1641 | signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1642 | else if (non_stop && !is_executing (lp->ptid)) | |
1643 | { | |
1644 | struct thread_info *tp = find_thread_ptid (lp->ptid); | |
e0881a8e | 1645 | |
16c381f0 | 1646 | signo = tp->suspend.stop_signal; |
ca2163eb PA |
1647 | } |
1648 | else if (!non_stop) | |
a0ef4274 | 1649 | { |
ca2163eb PA |
1650 | struct target_waitstatus last; |
1651 | ptid_t last_ptid; | |
4c28f408 | 1652 | |
ca2163eb | 1653 | get_last_target_status (&last_ptid, &last); |
4c28f408 | 1654 | |
ca2163eb PA |
1655 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) |
1656 | { | |
e09875d4 | 1657 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
e0881a8e | 1658 | |
16c381f0 | 1659 | signo = tp->suspend.stop_signal; |
4c28f408 | 1660 | } |
ca2163eb | 1661 | } |
4c28f408 | 1662 | |
ca2163eb | 1663 | *status = 0; |
4c28f408 | 1664 | |
ca2163eb PA |
1665 | if (signo == TARGET_SIGNAL_0) |
1666 | { | |
1667 | if (debug_linux_nat) | |
1668 | fprintf_unfiltered (gdb_stdlog, | |
1669 | "GPT: lwp %s has no pending signal\n", | |
1670 | target_pid_to_str (lp->ptid)); | |
1671 | } | |
1672 | else if (!signal_pass_state (signo)) | |
1673 | { | |
1674 | if (debug_linux_nat) | |
3e43a32a MS |
1675 | fprintf_unfiltered (gdb_stdlog, |
1676 | "GPT: lwp %s had signal %s, " | |
1677 | "but it is in no pass state\n", | |
ca2163eb PA |
1678 | target_pid_to_str (lp->ptid), |
1679 | target_signal_to_string (signo)); | |
a0ef4274 | 1680 | } |
a0ef4274 | 1681 | else |
4c28f408 | 1682 | { |
ca2163eb PA |
1683 | *status = W_STOPCODE (target_signal_to_host (signo)); |
1684 | ||
1685 | if (debug_linux_nat) | |
1686 | fprintf_unfiltered (gdb_stdlog, | |
1687 | "GPT: lwp %s has pending signal %s\n", | |
1688 | target_pid_to_str (lp->ptid), | |
1689 | target_signal_to_string (signo)); | |
4c28f408 | 1690 | } |
a0ef4274 DJ |
1691 | |
1692 | return 0; | |
1693 | } | |
1694 | ||
d6b0e80f AC |
1695 | static int |
1696 | detach_callback (struct lwp_info *lp, void *data) | |
1697 | { | |
1698 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1699 | ||
1700 | if (debug_linux_nat && lp->status) | |
1701 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1702 | strsignal (WSTOPSIG (lp->status)), | |
1703 | target_pid_to_str (lp->ptid)); | |
1704 | ||
a0ef4274 DJ |
1705 | /* If there is a pending SIGSTOP, get rid of it. */ |
1706 | if (lp->signalled) | |
d6b0e80f | 1707 | { |
d6b0e80f AC |
1708 | if (debug_linux_nat) |
1709 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1710 | "DC: Sending SIGCONT to %s\n", |
1711 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1712 | |
a0ef4274 | 1713 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1714 | lp->signalled = 0; |
d6b0e80f AC |
1715 | } |
1716 | ||
1717 | /* We don't actually detach from the LWP that has an id equal to the | |
1718 | overall process id just yet. */ | |
1719 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1720 | { | |
a0ef4274 DJ |
1721 | int status = 0; |
1722 | ||
1723 | /* Pass on any pending signal for this LWP. */ | |
1724 | get_pending_status (lp, &status); | |
1725 | ||
d6b0e80f AC |
1726 | errno = 0; |
1727 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1728 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1729 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1730 | safe_strerror (errno)); |
1731 | ||
1732 | if (debug_linux_nat) | |
1733 | fprintf_unfiltered (gdb_stdlog, | |
1734 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1735 | target_pid_to_str (lp->ptid), | |
7feb7d06 | 1736 | strsignal (WSTOPSIG (status))); |
d6b0e80f AC |
1737 | |
1738 | delete_lwp (lp->ptid); | |
1739 | } | |
1740 | ||
1741 | return 0; | |
1742 | } | |
1743 | ||
1744 | static void | |
136d6dae | 1745 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1746 | { |
b84876c2 | 1747 | int pid; |
a0ef4274 | 1748 | int status; |
d90e17a7 PA |
1749 | struct lwp_info *main_lwp; |
1750 | ||
1751 | pid = GET_PID (inferior_ptid); | |
a0ef4274 | 1752 | |
b84876c2 PA |
1753 | if (target_can_async_p ()) |
1754 | linux_nat_async (NULL, 0); | |
1755 | ||
4c28f408 PA |
1756 | /* Stop all threads before detaching. ptrace requires that the |
1757 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1758 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1759 | /* ... and wait until all of them have reported back that |
1760 | they're no longer running. */ | |
d90e17a7 | 1761 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1762 | |
d90e17a7 | 1763 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1764 | |
1765 | /* Only the initial process should be left right now. */ | |
d90e17a7 PA |
1766 | gdb_assert (num_lwps (GET_PID (inferior_ptid)) == 1); |
1767 | ||
1768 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1769 | |
a0ef4274 DJ |
1770 | /* Pass on any pending signal for the last LWP. */ |
1771 | if ((args == NULL || *args == '\0') | |
d90e17a7 | 1772 | && get_pending_status (main_lwp, &status) != -1 |
a0ef4274 DJ |
1773 | && WIFSTOPPED (status)) |
1774 | { | |
1775 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1776 | pass it along with PTRACE_DETACH. */ | |
1777 | args = alloca (8); | |
1778 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
ddabfc73 TT |
1779 | if (debug_linux_nat) |
1780 | fprintf_unfiltered (gdb_stdlog, | |
1781 | "LND: Sending signal %s to %s\n", | |
1782 | args, | |
1783 | target_pid_to_str (main_lwp->ptid)); | |
a0ef4274 DJ |
1784 | } |
1785 | ||
d90e17a7 | 1786 | delete_lwp (main_lwp->ptid); |
b84876c2 | 1787 | |
7a7d3353 PA |
1788 | if (forks_exist_p ()) |
1789 | { | |
1790 | /* Multi-fork case. The current inferior_ptid is being detached | |
1791 | from, but there are other viable forks to debug. Detach from | |
1792 | the current fork, and context-switch to the first | |
1793 | available. */ | |
1794 | linux_fork_detach (args, from_tty); | |
1795 | ||
1796 | if (non_stop && target_can_async_p ()) | |
1797 | target_async (inferior_event_handler, 0); | |
1798 | } | |
1799 | else | |
1800 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1801 | } |
1802 | ||
1803 | /* Resume LP. */ | |
1804 | ||
25289eb2 PA |
1805 | static void |
1806 | resume_lwp (struct lwp_info *lp, int step) | |
d6b0e80f | 1807 | { |
25289eb2 | 1808 | if (lp->stopped) |
6c95b8df | 1809 | { |
25289eb2 PA |
1810 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
1811 | ||
1812 | if (inf->vfork_child != NULL) | |
1813 | { | |
1814 | if (debug_linux_nat) | |
1815 | fprintf_unfiltered (gdb_stdlog, | |
1816 | "RC: Not resuming %s (vfork parent)\n", | |
1817 | target_pid_to_str (lp->ptid)); | |
1818 | } | |
1819 | else if (lp->status == 0 | |
1820 | && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) | |
1821 | { | |
1822 | if (debug_linux_nat) | |
1823 | fprintf_unfiltered (gdb_stdlog, | |
1824 | "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n", | |
1825 | target_pid_to_str (lp->ptid)); | |
1826 | ||
1827 | linux_ops->to_resume (linux_ops, | |
1828 | pid_to_ptid (GET_LWP (lp->ptid)), | |
1829 | step, TARGET_SIGNAL_0); | |
25289eb2 PA |
1830 | lp->stopped = 0; |
1831 | lp->step = step; | |
1832 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
1833 | lp->stopped_by_watchpoint = 0; | |
1834 | } | |
1835 | else | |
1836 | { | |
1837 | if (debug_linux_nat) | |
1838 | fprintf_unfiltered (gdb_stdlog, | |
1839 | "RC: Not resuming sibling %s (has pending)\n", | |
1840 | target_pid_to_str (lp->ptid)); | |
1841 | } | |
6c95b8df | 1842 | } |
25289eb2 | 1843 | else |
d6b0e80f | 1844 | { |
d90e17a7 PA |
1845 | if (debug_linux_nat) |
1846 | fprintf_unfiltered (gdb_stdlog, | |
25289eb2 | 1847 | "RC: Not resuming sibling %s (not stopped)\n", |
d6b0e80f | 1848 | target_pid_to_str (lp->ptid)); |
d6b0e80f | 1849 | } |
25289eb2 | 1850 | } |
d6b0e80f | 1851 | |
25289eb2 PA |
1852 | static int |
1853 | resume_callback (struct lwp_info *lp, void *data) | |
1854 | { | |
1855 | resume_lwp (lp, 0); | |
d6b0e80f AC |
1856 | return 0; |
1857 | } | |
1858 | ||
1859 | static int | |
1860 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1861 | { | |
1862 | lp->resumed = 0; | |
25289eb2 | 1863 | lp->last_resume_kind = resume_stop; |
d6b0e80f AC |
1864 | return 0; |
1865 | } | |
1866 | ||
1867 | static int | |
1868 | resume_set_callback (struct lwp_info *lp, void *data) | |
1869 | { | |
1870 | lp->resumed = 1; | |
25289eb2 | 1871 | lp->last_resume_kind = resume_continue; |
d6b0e80f AC |
1872 | return 0; |
1873 | } | |
1874 | ||
1875 | static void | |
28439f5e PA |
1876 | linux_nat_resume (struct target_ops *ops, |
1877 | ptid_t ptid, int step, enum target_signal signo) | |
d6b0e80f | 1878 | { |
7feb7d06 | 1879 | sigset_t prev_mask; |
d6b0e80f | 1880 | struct lwp_info *lp; |
d90e17a7 | 1881 | int resume_many; |
d6b0e80f | 1882 | |
76f50ad1 DJ |
1883 | if (debug_linux_nat) |
1884 | fprintf_unfiltered (gdb_stdlog, | |
1885 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1886 | step ? "step" : "resume", | |
1887 | target_pid_to_str (ptid), | |
423ec54c JK |
1888 | (signo != TARGET_SIGNAL_0 |
1889 | ? strsignal (target_signal_to_host (signo)) : "0"), | |
76f50ad1 DJ |
1890 | target_pid_to_str (inferior_ptid)); |
1891 | ||
7feb7d06 | 1892 | block_child_signals (&prev_mask); |
b84876c2 | 1893 | |
d6b0e80f | 1894 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1895 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1896 | || ptid_is_pid (ptid)); | |
4c28f408 | 1897 | |
e3e9f5a2 PA |
1898 | /* Mark the lwps we're resuming as resumed. */ |
1899 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
d6b0e80f | 1900 | |
d90e17a7 PA |
1901 | /* See if it's the current inferior that should be handled |
1902 | specially. */ | |
1903 | if (resume_many) | |
1904 | lp = find_lwp_pid (inferior_ptid); | |
1905 | else | |
1906 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1907 | gdb_assert (lp != NULL); |
d6b0e80f | 1908 | |
9f0bdab8 DJ |
1909 | /* Remember if we're stepping. */ |
1910 | lp->step = step; | |
25289eb2 | 1911 | lp->last_resume_kind = step ? resume_step : resume_continue; |
d6b0e80f | 1912 | |
9f0bdab8 DJ |
1913 | /* If we have a pending wait status for this thread, there is no |
1914 | point in resuming the process. But first make sure that | |
1915 | linux_nat_wait won't preemptively handle the event - we | |
1916 | should never take this short-circuit if we are going to | |
1917 | leave LP running, since we have skipped resuming all the | |
1918 | other threads. This bit of code needs to be synchronized | |
1919 | with linux_nat_wait. */ | |
76f50ad1 | 1920 | |
9f0bdab8 DJ |
1921 | if (lp->status && WIFSTOPPED (lp->status)) |
1922 | { | |
2455069d UW |
1923 | if (!lp->step |
1924 | && WSTOPSIG (lp->status) | |
1925 | && sigismember (&pass_mask, WSTOPSIG (lp->status))) | |
d6b0e80f | 1926 | { |
9f0bdab8 DJ |
1927 | if (debug_linux_nat) |
1928 | fprintf_unfiltered (gdb_stdlog, | |
1929 | "LLR: Not short circuiting for ignored " | |
1930 | "status 0x%x\n", lp->status); | |
1931 | ||
d6b0e80f AC |
1932 | /* FIXME: What should we do if we are supposed to continue |
1933 | this thread with a signal? */ | |
1934 | gdb_assert (signo == TARGET_SIGNAL_0); | |
2455069d | 1935 | signo = target_signal_from_host (WSTOPSIG (lp->status)); |
9f0bdab8 DJ |
1936 | lp->status = 0; |
1937 | } | |
1938 | } | |
76f50ad1 | 1939 | |
6c95b8df | 1940 | if (lp->status || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
9f0bdab8 DJ |
1941 | { |
1942 | /* FIXME: What should we do if we are supposed to continue | |
1943 | this thread with a signal? */ | |
1944 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1945 | |
9f0bdab8 DJ |
1946 | if (debug_linux_nat) |
1947 | fprintf_unfiltered (gdb_stdlog, | |
1948 | "LLR: Short circuiting for status 0x%x\n", | |
1949 | lp->status); | |
d6b0e80f | 1950 | |
7feb7d06 PA |
1951 | restore_child_signals_mask (&prev_mask); |
1952 | if (target_can_async_p ()) | |
1953 | { | |
1954 | target_async (inferior_event_handler, 0); | |
1955 | /* Tell the event loop we have something to process. */ | |
1956 | async_file_mark (); | |
1957 | } | |
9f0bdab8 | 1958 | return; |
d6b0e80f AC |
1959 | } |
1960 | ||
9f0bdab8 DJ |
1961 | /* Mark LWP as not stopped to prevent it from being continued by |
1962 | resume_callback. */ | |
1963 | lp->stopped = 0; | |
1964 | ||
d90e17a7 PA |
1965 | if (resume_many) |
1966 | iterate_over_lwps (ptid, resume_callback, NULL); | |
1967 | ||
1968 | /* Convert to something the lower layer understands. */ | |
1969 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
d6b0e80f | 1970 | |
28439f5e | 1971 | linux_ops->to_resume (linux_ops, ptid, step, signo); |
9f0bdab8 | 1972 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
ebec9a0f | 1973 | lp->stopped_by_watchpoint = 0; |
9f0bdab8 | 1974 | |
d6b0e80f AC |
1975 | if (debug_linux_nat) |
1976 | fprintf_unfiltered (gdb_stdlog, | |
1977 | "LLR: %s %s, %s (resume event thread)\n", | |
1978 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1979 | target_pid_to_str (ptid), | |
423ec54c JK |
1980 | (signo != TARGET_SIGNAL_0 |
1981 | ? strsignal (target_signal_to_host (signo)) : "0")); | |
b84876c2 | 1982 | |
7feb7d06 | 1983 | restore_child_signals_mask (&prev_mask); |
b84876c2 | 1984 | if (target_can_async_p ()) |
8ea051c5 | 1985 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
1986 | } |
1987 | ||
c5f62d5f | 1988 | /* Send a signal to an LWP. */ |
d6b0e80f AC |
1989 | |
1990 | static int | |
1991 | kill_lwp (int lwpid, int signo) | |
1992 | { | |
c5f62d5f DE |
1993 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
1994 | fails, then we are not using nptl threads and we should be using kill. */ | |
d6b0e80f AC |
1995 | |
1996 | #ifdef HAVE_TKILL_SYSCALL | |
c5f62d5f DE |
1997 | { |
1998 | static int tkill_failed; | |
1999 | ||
2000 | if (!tkill_failed) | |
2001 | { | |
2002 | int ret; | |
2003 | ||
2004 | errno = 0; | |
2005 | ret = syscall (__NR_tkill, lwpid, signo); | |
2006 | if (errno != ENOSYS) | |
2007 | return ret; | |
2008 | tkill_failed = 1; | |
2009 | } | |
2010 | } | |
d6b0e80f AC |
2011 | #endif |
2012 | ||
2013 | return kill (lwpid, signo); | |
2014 | } | |
2015 | ||
ca2163eb PA |
2016 | /* Handle a GNU/Linux syscall trap wait response. If we see a syscall |
2017 | event, check if the core is interested in it: if not, ignore the | |
2018 | event, and keep waiting; otherwise, we need to toggle the LWP's | |
2019 | syscall entry/exit status, since the ptrace event itself doesn't | |
2020 | indicate it, and report the trap to higher layers. */ | |
2021 | ||
2022 | static int | |
2023 | linux_handle_syscall_trap (struct lwp_info *lp, int stopping) | |
2024 | { | |
2025 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
2026 | struct gdbarch *gdbarch = target_thread_architecture (lp->ptid); | |
2027 | int syscall_number = (int) gdbarch_get_syscall_number (gdbarch, lp->ptid); | |
2028 | ||
2029 | if (stopping) | |
2030 | { | |
2031 | /* If we're stopping threads, there's a SIGSTOP pending, which | |
2032 | makes it so that the LWP reports an immediate syscall return, | |
2033 | followed by the SIGSTOP. Skip seeing that "return" using | |
2034 | PTRACE_CONT directly, and let stop_wait_callback collect the | |
2035 | SIGSTOP. Later when the thread is resumed, a new syscall | |
2036 | entry event. If we didn't do this (and returned 0), we'd | |
2037 | leave a syscall entry pending, and our caller, by using | |
2038 | PTRACE_CONT to collect the SIGSTOP, skips the syscall return | |
2039 | itself. Later, when the user re-resumes this LWP, we'd see | |
2040 | another syscall entry event and we'd mistake it for a return. | |
2041 | ||
2042 | If stop_wait_callback didn't force the SIGSTOP out of the LWP | |
2043 | (leaving immediately with LWP->signalled set, without issuing | |
2044 | a PTRACE_CONT), it would still be problematic to leave this | |
2045 | syscall enter pending, as later when the thread is resumed, | |
2046 | it would then see the same syscall exit mentioned above, | |
2047 | followed by the delayed SIGSTOP, while the syscall didn't | |
2048 | actually get to execute. It seems it would be even more | |
2049 | confusing to the user. */ | |
2050 | ||
2051 | if (debug_linux_nat) | |
2052 | fprintf_unfiltered (gdb_stdlog, | |
2053 | "LHST: ignoring syscall %d " | |
2054 | "for LWP %ld (stopping threads), " | |
2055 | "resuming with PTRACE_CONT for SIGSTOP\n", | |
2056 | syscall_number, | |
2057 | GET_LWP (lp->ptid)); | |
2058 | ||
2059 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2060 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2061 | return 1; | |
2062 | } | |
2063 | ||
2064 | if (catch_syscall_enabled ()) | |
2065 | { | |
2066 | /* Always update the entry/return state, even if this particular | |
2067 | syscall isn't interesting to the core now. In async mode, | |
2068 | the user could install a new catchpoint for this syscall | |
2069 | between syscall enter/return, and we'll need to know to | |
2070 | report a syscall return if that happens. */ | |
2071 | lp->syscall_state = (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2072 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2073 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2074 | ||
2075 | if (catching_syscall_number (syscall_number)) | |
2076 | { | |
2077 | /* Alright, an event to report. */ | |
2078 | ourstatus->kind = lp->syscall_state; | |
2079 | ourstatus->value.syscall_number = syscall_number; | |
2080 | ||
2081 | if (debug_linux_nat) | |
2082 | fprintf_unfiltered (gdb_stdlog, | |
2083 | "LHST: stopping for %s of syscall %d" | |
2084 | " for LWP %ld\n", | |
3e43a32a MS |
2085 | lp->syscall_state |
2086 | == TARGET_WAITKIND_SYSCALL_ENTRY | |
ca2163eb PA |
2087 | ? "entry" : "return", |
2088 | syscall_number, | |
2089 | GET_LWP (lp->ptid)); | |
2090 | return 0; | |
2091 | } | |
2092 | ||
2093 | if (debug_linux_nat) | |
2094 | fprintf_unfiltered (gdb_stdlog, | |
2095 | "LHST: ignoring %s of syscall %d " | |
2096 | "for LWP %ld\n", | |
2097 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2098 | ? "entry" : "return", | |
2099 | syscall_number, | |
2100 | GET_LWP (lp->ptid)); | |
2101 | } | |
2102 | else | |
2103 | { | |
2104 | /* If we had been syscall tracing, and hence used PT_SYSCALL | |
2105 | before on this LWP, it could happen that the user removes all | |
2106 | syscall catchpoints before we get to process this event. | |
2107 | There are two noteworthy issues here: | |
2108 | ||
2109 | - When stopped at a syscall entry event, resuming with | |
2110 | PT_STEP still resumes executing the syscall and reports a | |
2111 | syscall return. | |
2112 | ||
2113 | - Only PT_SYSCALL catches syscall enters. If we last | |
2114 | single-stepped this thread, then this event can't be a | |
2115 | syscall enter. If we last single-stepped this thread, this | |
2116 | has to be a syscall exit. | |
2117 | ||
2118 | The points above mean that the next resume, be it PT_STEP or | |
2119 | PT_CONTINUE, can not trigger a syscall trace event. */ | |
2120 | if (debug_linux_nat) | |
2121 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2122 | "LHST: caught syscall event " |
2123 | "with no syscall catchpoints." | |
ca2163eb PA |
2124 | " %d for LWP %ld, ignoring\n", |
2125 | syscall_number, | |
2126 | GET_LWP (lp->ptid)); | |
2127 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2128 | } | |
2129 | ||
2130 | /* The core isn't interested in this event. For efficiency, avoid | |
2131 | stopping all threads only to have the core resume them all again. | |
2132 | Since we're not stopping threads, if we're still syscall tracing | |
2133 | and not stepping, we can't use PTRACE_CONT here, as we'd miss any | |
2134 | subsequent syscall. Simply resume using the inf-ptrace layer, | |
2135 | which knows when to use PT_SYSCALL or PT_CONTINUE. */ | |
2136 | ||
2137 | /* Note that gdbarch_get_syscall_number may access registers, hence | |
2138 | fill a regcache. */ | |
2139 | registers_changed (); | |
2140 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
2141 | lp->step, TARGET_SIGNAL_0); | |
2142 | return 1; | |
2143 | } | |
2144 | ||
3d799a95 DJ |
2145 | /* Handle a GNU/Linux extended wait response. If we see a clone |
2146 | event, we need to add the new LWP to our list (and not report the | |
2147 | trap to higher layers). This function returns non-zero if the | |
2148 | event should be ignored and we should wait again. If STOPPING is | |
2149 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
2150 | |
2151 | static int | |
3d799a95 DJ |
2152 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
2153 | int stopping) | |
d6b0e80f | 2154 | { |
3d799a95 DJ |
2155 | int pid = GET_LWP (lp->ptid); |
2156 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
3d799a95 | 2157 | int event = status >> 16; |
d6b0e80f | 2158 | |
3d799a95 DJ |
2159 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
2160 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 2161 | { |
3d799a95 DJ |
2162 | unsigned long new_pid; |
2163 | int ret; | |
2164 | ||
2165 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 2166 | |
3d799a95 DJ |
2167 | /* If we haven't already seen the new PID stop, wait for it now. */ |
2168 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
2169 | { | |
2170 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
2171 | hits the SIGSTOP, but we're already attached. */ | |
2172 | ret = my_waitpid (new_pid, &status, | |
2173 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
2174 | if (ret == -1) | |
2175 | perror_with_name (_("waiting for new child")); | |
2176 | else if (ret != new_pid) | |
2177 | internal_error (__FILE__, __LINE__, | |
2178 | _("wait returned unexpected PID %d"), ret); | |
2179 | else if (!WIFSTOPPED (status)) | |
2180 | internal_error (__FILE__, __LINE__, | |
2181 | _("wait returned unexpected status 0x%x"), status); | |
2182 | } | |
2183 | ||
3a3e9ee3 | 2184 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 | 2185 | |
2277426b PA |
2186 | if (event == PTRACE_EVENT_FORK |
2187 | && linux_fork_checkpointing_p (GET_PID (lp->ptid))) | |
2188 | { | |
2277426b PA |
2189 | /* Handle checkpointing by linux-fork.c here as a special |
2190 | case. We don't want the follow-fork-mode or 'catch fork' | |
2191 | to interfere with this. */ | |
2192 | ||
2193 | /* This won't actually modify the breakpoint list, but will | |
2194 | physically remove the breakpoints from the child. */ | |
2195 | detach_breakpoints (new_pid); | |
2196 | ||
2197 | /* Retain child fork in ptrace (stopped) state. */ | |
14571dad MS |
2198 | if (!find_fork_pid (new_pid)) |
2199 | add_fork (new_pid); | |
2277426b PA |
2200 | |
2201 | /* Report as spurious, so that infrun doesn't want to follow | |
2202 | this fork. We're actually doing an infcall in | |
2203 | linux-fork.c. */ | |
2204 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
2205 | linux_enable_event_reporting (pid_to_ptid (new_pid)); | |
2206 | ||
2207 | /* Report the stop to the core. */ | |
2208 | return 0; | |
2209 | } | |
2210 | ||
3d799a95 DJ |
2211 | if (event == PTRACE_EVENT_FORK) |
2212 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
2213 | else if (event == PTRACE_EVENT_VFORK) | |
2214 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 2215 | else |
3d799a95 | 2216 | { |
78768c4a JK |
2217 | struct lwp_info *new_lp; |
2218 | ||
3d799a95 | 2219 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
78768c4a | 2220 | |
3c4d7e12 PA |
2221 | if (debug_linux_nat) |
2222 | fprintf_unfiltered (gdb_stdlog, | |
2223 | "LHEW: Got clone event " | |
2224 | "from LWP %d, new child is LWP %ld\n", | |
2225 | pid, new_pid); | |
2226 | ||
d90e17a7 | 2227 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (lp->ptid))); |
3d799a95 | 2228 | new_lp->cloned = 1; |
4c28f408 | 2229 | new_lp->stopped = 1; |
d6b0e80f | 2230 | |
3d799a95 DJ |
2231 | if (WSTOPSIG (status) != SIGSTOP) |
2232 | { | |
2233 | /* This can happen if someone starts sending signals to | |
2234 | the new thread before it gets a chance to run, which | |
2235 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
2236 | This is an unlikely case, and harder to handle for | |
2237 | fork / vfork than for clone, so we do not try - but | |
2238 | we handle it for clone events here. We'll send | |
2239 | the other signal on to the thread below. */ | |
2240 | ||
2241 | new_lp->signalled = 1; | |
2242 | } | |
2243 | else | |
79395f92 PA |
2244 | { |
2245 | struct thread_info *tp; | |
2246 | ||
2247 | /* When we stop for an event in some other thread, and | |
2248 | pull the thread list just as this thread has cloned, | |
2249 | we'll have seen the new thread in the thread_db list | |
2250 | before handling the CLONE event (glibc's | |
2251 | pthread_create adds the new thread to the thread list | |
2252 | before clone'ing, and has the kernel fill in the | |
2253 | thread's tid on the clone call with | |
2254 | CLONE_PARENT_SETTID). If that happened, and the core | |
2255 | had requested the new thread to stop, we'll have | |
2256 | killed it with SIGSTOP. But since SIGSTOP is not an | |
2257 | RT signal, it can only be queued once. We need to be | |
2258 | careful to not resume the LWP if we wanted it to | |
2259 | stop. In that case, we'll leave the SIGSTOP pending. | |
2260 | It will later be reported as TARGET_SIGNAL_0. */ | |
2261 | tp = find_thread_ptid (new_lp->ptid); | |
2262 | if (tp != NULL && tp->stop_requested) | |
2263 | new_lp->last_resume_kind = resume_stop; | |
2264 | else | |
2265 | status = 0; | |
2266 | } | |
d6b0e80f | 2267 | |
4c28f408 | 2268 | if (non_stop) |
3d799a95 | 2269 | { |
4c28f408 PA |
2270 | /* Add the new thread to GDB's lists as soon as possible |
2271 | so that: | |
2272 | ||
2273 | 1) the frontend doesn't have to wait for a stop to | |
2274 | display them, and, | |
2275 | ||
2276 | 2) we tag it with the correct running state. */ | |
2277 | ||
2278 | /* If the thread_db layer is active, let it know about | |
2279 | this new thread, and add it to GDB's list. */ | |
2280 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
2281 | { | |
2282 | /* We're not using thread_db. Add it to GDB's | |
2283 | list. */ | |
2284 | target_post_attach (GET_LWP (new_lp->ptid)); | |
2285 | add_thread (new_lp->ptid); | |
2286 | } | |
2287 | ||
2288 | if (!stopping) | |
2289 | { | |
2290 | set_running (new_lp->ptid, 1); | |
2291 | set_executing (new_lp->ptid, 1); | |
2292 | } | |
2293 | } | |
2294 | ||
79395f92 PA |
2295 | if (status != 0) |
2296 | { | |
2297 | /* We created NEW_LP so it cannot yet contain STATUS. */ | |
2298 | gdb_assert (new_lp->status == 0); | |
2299 | ||
2300 | /* Save the wait status to report later. */ | |
2301 | if (debug_linux_nat) | |
2302 | fprintf_unfiltered (gdb_stdlog, | |
2303 | "LHEW: waitpid of new LWP %ld, " | |
2304 | "saving status %s\n", | |
2305 | (long) GET_LWP (new_lp->ptid), | |
2306 | status_to_str (status)); | |
2307 | new_lp->status = status; | |
2308 | } | |
2309 | ||
ca2163eb PA |
2310 | /* Note the need to use the low target ops to resume, to |
2311 | handle resuming with PT_SYSCALL if we have syscall | |
2312 | catchpoints. */ | |
4c28f408 PA |
2313 | if (!stopping) |
2314 | { | |
3d799a95 | 2315 | new_lp->resumed = 1; |
ca2163eb | 2316 | |
79395f92 | 2317 | if (status == 0) |
ad34eb2f | 2318 | { |
ad34eb2f JK |
2319 | if (debug_linux_nat) |
2320 | fprintf_unfiltered (gdb_stdlog, | |
79395f92 PA |
2321 | "LHEW: resuming new LWP %ld\n", |
2322 | GET_LWP (new_lp->ptid)); | |
2323 | linux_ops->to_resume (linux_ops, pid_to_ptid (new_pid), | |
2324 | 0, TARGET_SIGNAL_0); | |
2325 | new_lp->stopped = 0; | |
ad34eb2f JK |
2326 | } |
2327 | } | |
d6b0e80f | 2328 | |
3d799a95 DJ |
2329 | if (debug_linux_nat) |
2330 | fprintf_unfiltered (gdb_stdlog, | |
3c4d7e12 | 2331 | "LHEW: resuming parent LWP %d\n", pid); |
ca2163eb PA |
2332 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
2333 | 0, TARGET_SIGNAL_0); | |
3d799a95 DJ |
2334 | |
2335 | return 1; | |
2336 | } | |
2337 | ||
2338 | return 0; | |
d6b0e80f AC |
2339 | } |
2340 | ||
3d799a95 DJ |
2341 | if (event == PTRACE_EVENT_EXEC) |
2342 | { | |
a75724bc PA |
2343 | if (debug_linux_nat) |
2344 | fprintf_unfiltered (gdb_stdlog, | |
2345 | "LHEW: Got exec event from LWP %ld\n", | |
2346 | GET_LWP (lp->ptid)); | |
2347 | ||
3d799a95 DJ |
2348 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
2349 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 2350 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 | 2351 | |
6c95b8df PA |
2352 | return 0; |
2353 | } | |
2354 | ||
2355 | if (event == PTRACE_EVENT_VFORK_DONE) | |
2356 | { | |
2357 | if (current_inferior ()->waiting_for_vfork_done) | |
3d799a95 | 2358 | { |
6c95b8df | 2359 | if (debug_linux_nat) |
3e43a32a MS |
2360 | fprintf_unfiltered (gdb_stdlog, |
2361 | "LHEW: Got expected PTRACE_EVENT_" | |
2362 | "VFORK_DONE from LWP %ld: stopping\n", | |
6c95b8df | 2363 | GET_LWP (lp->ptid)); |
3d799a95 | 2364 | |
6c95b8df PA |
2365 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; |
2366 | return 0; | |
3d799a95 DJ |
2367 | } |
2368 | ||
6c95b8df | 2369 | if (debug_linux_nat) |
3e43a32a MS |
2370 | fprintf_unfiltered (gdb_stdlog, |
2371 | "LHEW: Got PTRACE_EVENT_VFORK_DONE " | |
2372 | "from LWP %ld: resuming\n", | |
6c95b8df PA |
2373 | GET_LWP (lp->ptid)); |
2374 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2375 | return 1; | |
3d799a95 DJ |
2376 | } |
2377 | ||
2378 | internal_error (__FILE__, __LINE__, | |
2379 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
2380 | } |
2381 | ||
432b4d03 JK |
2382 | /* Return non-zero if LWP is a zombie. */ |
2383 | ||
2384 | static int | |
2385 | linux_lwp_is_zombie (long lwp) | |
2386 | { | |
2387 | char buffer[MAXPATHLEN]; | |
2388 | FILE *procfile; | |
ea23808b PA |
2389 | int retval; |
2390 | int have_state; | |
432b4d03 | 2391 | |
07e78767 | 2392 | xsnprintf (buffer, sizeof (buffer), "/proc/%ld/status", lwp); |
432b4d03 JK |
2393 | procfile = fopen (buffer, "r"); |
2394 | if (procfile == NULL) | |
2395 | { | |
2396 | warning (_("unable to open /proc file '%s'"), buffer); | |
2397 | return 0; | |
2398 | } | |
ea23808b PA |
2399 | |
2400 | have_state = 0; | |
432b4d03 | 2401 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
ea23808b | 2402 | if (strncmp (buffer, "State:", 6) == 0) |
432b4d03 | 2403 | { |
ea23808b | 2404 | have_state = 1; |
432b4d03 JK |
2405 | break; |
2406 | } | |
ea23808b PA |
2407 | retval = (have_state |
2408 | && strcmp (buffer, "State:\tZ (zombie)\n") == 0); | |
432b4d03 | 2409 | fclose (procfile); |
432b4d03 JK |
2410 | return retval; |
2411 | } | |
2412 | ||
d6b0e80f AC |
2413 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has |
2414 | exited. */ | |
2415 | ||
2416 | static int | |
2417 | wait_lwp (struct lwp_info *lp) | |
2418 | { | |
2419 | pid_t pid; | |
432b4d03 | 2420 | int status = 0; |
d6b0e80f | 2421 | int thread_dead = 0; |
432b4d03 | 2422 | sigset_t prev_mask; |
d6b0e80f AC |
2423 | |
2424 | gdb_assert (!lp->stopped); | |
2425 | gdb_assert (lp->status == 0); | |
2426 | ||
432b4d03 JK |
2427 | /* Make sure SIGCHLD is blocked for sigsuspend avoiding a race below. */ |
2428 | block_child_signals (&prev_mask); | |
2429 | ||
2430 | for (;;) | |
d6b0e80f | 2431 | { |
432b4d03 JK |
2432 | /* If my_waitpid returns 0 it means the __WCLONE vs. non-__WCLONE kind |
2433 | was right and we should just call sigsuspend. */ | |
2434 | ||
2435 | pid = my_waitpid (GET_LWP (lp->ptid), &status, WNOHANG); | |
d6b0e80f | 2436 | if (pid == -1 && errno == ECHILD) |
432b4d03 | 2437 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE | WNOHANG); |
a9f4bb21 PA |
2438 | if (pid == -1 && errno == ECHILD) |
2439 | { | |
2440 | /* The thread has previously exited. We need to delete it | |
2441 | now because, for some vendor 2.4 kernels with NPTL | |
2442 | support backported, there won't be an exit event unless | |
2443 | it is the main thread. 2.6 kernels will report an exit | |
2444 | event for each thread that exits, as expected. */ | |
2445 | thread_dead = 1; | |
2446 | if (debug_linux_nat) | |
2447 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2448 | target_pid_to_str (lp->ptid)); | |
2449 | } | |
432b4d03 JK |
2450 | if (pid != 0) |
2451 | break; | |
2452 | ||
2453 | /* Bugs 10970, 12702. | |
2454 | Thread group leader may have exited in which case we'll lock up in | |
2455 | waitpid if there are other threads, even if they are all zombies too. | |
2456 | Basically, we're not supposed to use waitpid this way. | |
2457 | __WCLONE is not applicable for the leader so we can't use that. | |
2458 | LINUX_NAT_THREAD_ALIVE cannot be used here as it requires a STOPPED | |
2459 | process; it gets ESRCH both for the zombie and for running processes. | |
2460 | ||
2461 | As a workaround, check if we're waiting for the thread group leader and | |
2462 | if it's a zombie, and avoid calling waitpid if it is. | |
2463 | ||
2464 | This is racy, what if the tgl becomes a zombie right after we check? | |
2465 | Therefore always use WNOHANG with sigsuspend - it is equivalent to | |
2466 | waiting waitpid but the linux_lwp_is_zombie is safe this way. */ | |
2467 | ||
2468 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid) | |
2469 | && linux_lwp_is_zombie (GET_LWP (lp->ptid))) | |
d6b0e80f | 2470 | { |
d6b0e80f AC |
2471 | thread_dead = 1; |
2472 | if (debug_linux_nat) | |
432b4d03 JK |
2473 | fprintf_unfiltered (gdb_stdlog, |
2474 | "WL: Thread group leader %s vanished.\n", | |
d6b0e80f | 2475 | target_pid_to_str (lp->ptid)); |
432b4d03 | 2476 | break; |
d6b0e80f | 2477 | } |
432b4d03 JK |
2478 | |
2479 | /* Wait for next SIGCHLD and try again. This may let SIGCHLD handlers | |
2480 | get invoked despite our caller had them intentionally blocked by | |
2481 | block_child_signals. This is sensitive only to the loop of | |
2482 | linux_nat_wait_1 and there if we get called my_waitpid gets called | |
2483 | again before it gets to sigsuspend so we can safely let the handlers | |
2484 | get executed here. */ | |
2485 | ||
2486 | sigsuspend (&suspend_mask); | |
2487 | } | |
2488 | ||
2489 | restore_child_signals_mask (&prev_mask); | |
2490 | ||
d6b0e80f AC |
2491 | if (!thread_dead) |
2492 | { | |
2493 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
2494 | ||
2495 | if (debug_linux_nat) | |
2496 | { | |
2497 | fprintf_unfiltered (gdb_stdlog, | |
2498 | "WL: waitpid %s received %s\n", | |
2499 | target_pid_to_str (lp->ptid), | |
2500 | status_to_str (status)); | |
2501 | } | |
d6b0e80f | 2502 | |
a9f4bb21 PA |
2503 | /* Check if the thread has exited. */ |
2504 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2505 | { | |
2506 | thread_dead = 1; | |
2507 | if (debug_linux_nat) | |
2508 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2509 | target_pid_to_str (lp->ptid)); | |
2510 | } | |
d6b0e80f AC |
2511 | } |
2512 | ||
2513 | if (thread_dead) | |
2514 | { | |
e26af52f | 2515 | exit_lwp (lp); |
d6b0e80f AC |
2516 | return 0; |
2517 | } | |
2518 | ||
2519 | gdb_assert (WIFSTOPPED (status)); | |
2520 | ||
ca2163eb PA |
2521 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
2522 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
2523 | { | |
2524 | /* No longer need the sysgood bit. The ptrace event ends up | |
2525 | recorded in lp->waitstatus if we care for it. We can carry | |
2526 | on handling the event like a regular SIGTRAP from here | |
2527 | on. */ | |
2528 | status = W_STOPCODE (SIGTRAP); | |
2529 | if (linux_handle_syscall_trap (lp, 1)) | |
2530 | return wait_lwp (lp); | |
2531 | } | |
2532 | ||
d6b0e80f AC |
2533 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
2534 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2535 | { | |
2536 | if (debug_linux_nat) | |
2537 | fprintf_unfiltered (gdb_stdlog, | |
2538 | "WL: Handling extended status 0x%06x\n", | |
2539 | status); | |
3d799a95 | 2540 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
2541 | return wait_lwp (lp); |
2542 | } | |
2543 | ||
2544 | return status; | |
2545 | } | |
2546 | ||
9f0bdab8 DJ |
2547 | /* Save the most recent siginfo for LP. This is currently only called |
2548 | for SIGTRAP; some ports use the si_addr field for | |
2549 | target_stopped_data_address. In the future, it may also be used to | |
2550 | restore the siginfo of requeued signals. */ | |
2551 | ||
2552 | static void | |
2553 | save_siginfo (struct lwp_info *lp) | |
2554 | { | |
2555 | errno = 0; | |
2556 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
2557 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
2558 | ||
2559 | if (errno != 0) | |
2560 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
2561 | } | |
2562 | ||
d6b0e80f AC |
2563 | /* Send a SIGSTOP to LP. */ |
2564 | ||
2565 | static int | |
2566 | stop_callback (struct lwp_info *lp, void *data) | |
2567 | { | |
2568 | if (!lp->stopped && !lp->signalled) | |
2569 | { | |
2570 | int ret; | |
2571 | ||
2572 | if (debug_linux_nat) | |
2573 | { | |
2574 | fprintf_unfiltered (gdb_stdlog, | |
2575 | "SC: kill %s **<SIGSTOP>**\n", | |
2576 | target_pid_to_str (lp->ptid)); | |
2577 | } | |
2578 | errno = 0; | |
2579 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
2580 | if (debug_linux_nat) | |
2581 | { | |
2582 | fprintf_unfiltered (gdb_stdlog, | |
2583 | "SC: lwp kill %d %s\n", | |
2584 | ret, | |
2585 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2586 | } | |
2587 | ||
2588 | lp->signalled = 1; | |
2589 | gdb_assert (lp->status == 0); | |
2590 | } | |
2591 | ||
2592 | return 0; | |
2593 | } | |
2594 | ||
57380f4e | 2595 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2596 | |
2597 | static int | |
57380f4e DJ |
2598 | linux_nat_has_pending_sigint (int pid) |
2599 | { | |
2600 | sigset_t pending, blocked, ignored; | |
57380f4e DJ |
2601 | |
2602 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2603 | ||
2604 | if (sigismember (&pending, SIGINT) | |
2605 | && !sigismember (&ignored, SIGINT)) | |
2606 | return 1; | |
2607 | ||
2608 | return 0; | |
2609 | } | |
2610 | ||
2611 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2612 | ||
2613 | static int | |
2614 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2615 | { |
57380f4e DJ |
2616 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2617 | flag to consume the next one. */ | |
2618 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2619 | && WSTOPSIG (lp->status) == SIGINT) | |
2620 | lp->status = 0; | |
2621 | else | |
2622 | lp->ignore_sigint = 1; | |
2623 | ||
2624 | return 0; | |
2625 | } | |
2626 | ||
2627 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2628 | This function is called after we know the LWP has stopped; if the LWP | |
2629 | stopped before the expected SIGINT was delivered, then it will never have | |
2630 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2631 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2632 | |
57380f4e DJ |
2633 | static void |
2634 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2635 | { | |
2636 | if (!lp->ignore_sigint) | |
2637 | return; | |
2638 | ||
2639 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2640 | { | |
2641 | if (debug_linux_nat) | |
2642 | fprintf_unfiltered (gdb_stdlog, | |
2643 | "MCIS: Clearing bogus flag for %s\n", | |
2644 | target_pid_to_str (lp->ptid)); | |
2645 | lp->ignore_sigint = 0; | |
2646 | } | |
2647 | } | |
2648 | ||
ebec9a0f PA |
2649 | /* Fetch the possible triggered data watchpoint info and store it in |
2650 | LP. | |
2651 | ||
2652 | On some archs, like x86, that use debug registers to set | |
2653 | watchpoints, it's possible that the way to know which watched | |
2654 | address trapped, is to check the register that is used to select | |
2655 | which address to watch. Problem is, between setting the watchpoint | |
2656 | and reading back which data address trapped, the user may change | |
2657 | the set of watchpoints, and, as a consequence, GDB changes the | |
2658 | debug registers in the inferior. To avoid reading back a stale | |
2659 | stopped-data-address when that happens, we cache in LP the fact | |
2660 | that a watchpoint trapped, and the corresponding data address, as | |
2661 | soon as we see LP stop with a SIGTRAP. If GDB changes the debug | |
2662 | registers meanwhile, we have the cached data we can rely on. */ | |
2663 | ||
2664 | static void | |
2665 | save_sigtrap (struct lwp_info *lp) | |
2666 | { | |
2667 | struct cleanup *old_chain; | |
2668 | ||
2669 | if (linux_ops->to_stopped_by_watchpoint == NULL) | |
2670 | { | |
2671 | lp->stopped_by_watchpoint = 0; | |
2672 | return; | |
2673 | } | |
2674 | ||
2675 | old_chain = save_inferior_ptid (); | |
2676 | inferior_ptid = lp->ptid; | |
2677 | ||
2678 | lp->stopped_by_watchpoint = linux_ops->to_stopped_by_watchpoint (); | |
2679 | ||
2680 | if (lp->stopped_by_watchpoint) | |
2681 | { | |
2682 | if (linux_ops->to_stopped_data_address != NULL) | |
2683 | lp->stopped_data_address_p = | |
2684 | linux_ops->to_stopped_data_address (¤t_target, | |
2685 | &lp->stopped_data_address); | |
2686 | else | |
2687 | lp->stopped_data_address_p = 0; | |
2688 | } | |
2689 | ||
2690 | do_cleanups (old_chain); | |
2691 | } | |
2692 | ||
2693 | /* See save_sigtrap. */ | |
2694 | ||
2695 | static int | |
2696 | linux_nat_stopped_by_watchpoint (void) | |
2697 | { | |
2698 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2699 | ||
2700 | gdb_assert (lp != NULL); | |
2701 | ||
2702 | return lp->stopped_by_watchpoint; | |
2703 | } | |
2704 | ||
2705 | static int | |
2706 | linux_nat_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p) | |
2707 | { | |
2708 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2709 | ||
2710 | gdb_assert (lp != NULL); | |
2711 | ||
2712 | *addr_p = lp->stopped_data_address; | |
2713 | ||
2714 | return lp->stopped_data_address_p; | |
2715 | } | |
2716 | ||
26ab7092 JK |
2717 | /* Commonly any breakpoint / watchpoint generate only SIGTRAP. */ |
2718 | ||
2719 | static int | |
2720 | sigtrap_is_event (int status) | |
2721 | { | |
2722 | return WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP; | |
2723 | } | |
2724 | ||
2725 | /* SIGTRAP-like events recognizer. */ | |
2726 | ||
2727 | static int (*linux_nat_status_is_event) (int status) = sigtrap_is_event; | |
2728 | ||
00390b84 JK |
2729 | /* Check for SIGTRAP-like events in LP. */ |
2730 | ||
2731 | static int | |
2732 | linux_nat_lp_status_is_event (struct lwp_info *lp) | |
2733 | { | |
2734 | /* We check for lp->waitstatus in addition to lp->status, because we can | |
2735 | have pending process exits recorded in lp->status | |
2736 | and W_EXITCODE(0,0) == 0. We should probably have an additional | |
2737 | lp->status_p flag. */ | |
2738 | ||
2739 | return (lp->waitstatus.kind == TARGET_WAITKIND_IGNORE | |
2740 | && linux_nat_status_is_event (lp->status)); | |
2741 | } | |
2742 | ||
26ab7092 JK |
2743 | /* Set alternative SIGTRAP-like events recognizer. If |
2744 | breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be | |
2745 | applied. */ | |
2746 | ||
2747 | void | |
2748 | linux_nat_set_status_is_event (struct target_ops *t, | |
2749 | int (*status_is_event) (int status)) | |
2750 | { | |
2751 | linux_nat_status_is_event = status_is_event; | |
2752 | } | |
2753 | ||
57380f4e DJ |
2754 | /* Wait until LP is stopped. */ |
2755 | ||
2756 | static int | |
2757 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2758 | { | |
6c95b8df PA |
2759 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
2760 | ||
2761 | /* If this is a vfork parent, bail out, it is not going to report | |
2762 | any SIGSTOP until the vfork is done with. */ | |
2763 | if (inf->vfork_child != NULL) | |
2764 | return 0; | |
2765 | ||
d6b0e80f AC |
2766 | if (!lp->stopped) |
2767 | { | |
2768 | int status; | |
2769 | ||
2770 | status = wait_lwp (lp); | |
2771 | if (status == 0) | |
2772 | return 0; | |
2773 | ||
57380f4e DJ |
2774 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2775 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2776 | { |
57380f4e | 2777 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2778 | |
2779 | errno = 0; | |
2780 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2781 | if (debug_linux_nat) | |
2782 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2783 | "PTRACE_CONT %s, 0, 0 (%s) " |
2784 | "(discarding SIGINT)\n", | |
d6b0e80f AC |
2785 | target_pid_to_str (lp->ptid), |
2786 | errno ? safe_strerror (errno) : "OK"); | |
2787 | ||
57380f4e | 2788 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2789 | } |
2790 | ||
57380f4e DJ |
2791 | maybe_clear_ignore_sigint (lp); |
2792 | ||
d6b0e80f AC |
2793 | if (WSTOPSIG (status) != SIGSTOP) |
2794 | { | |
26ab7092 | 2795 | if (linux_nat_status_is_event (status)) |
d6b0e80f AC |
2796 | { |
2797 | /* If a LWP other than the LWP that we're reporting an | |
2798 | event for has hit a GDB breakpoint (as opposed to | |
2799 | some random trap signal), then just arrange for it to | |
2800 | hit it again later. We don't keep the SIGTRAP status | |
2801 | and don't forward the SIGTRAP signal to the LWP. We | |
2802 | will handle the current event, eventually we will | |
2803 | resume all LWPs, and this one will get its breakpoint | |
2804 | trap again. | |
2805 | ||
2806 | If we do not do this, then we run the risk that the | |
2807 | user will delete or disable the breakpoint, but the | |
2808 | thread will have already tripped on it. */ | |
2809 | ||
9f0bdab8 DJ |
2810 | /* Save the trap's siginfo in case we need it later. */ |
2811 | save_siginfo (lp); | |
2812 | ||
ebec9a0f PA |
2813 | save_sigtrap (lp); |
2814 | ||
1777feb0 | 2815 | /* Now resume this LWP and get the SIGSTOP event. */ |
d6b0e80f AC |
2816 | errno = 0; |
2817 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2818 | if (debug_linux_nat) | |
2819 | { | |
2820 | fprintf_unfiltered (gdb_stdlog, | |
2821 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2822 | target_pid_to_str (lp->ptid), | |
2823 | errno ? safe_strerror (errno) : "OK"); | |
2824 | ||
2825 | fprintf_unfiltered (gdb_stdlog, | |
2826 | "SWC: Candidate SIGTRAP event in %s\n", | |
2827 | target_pid_to_str (lp->ptid)); | |
2828 | } | |
710151dd | 2829 | /* Hold this event/waitstatus while we check to see if |
1777feb0 | 2830 | there are any more (we still want to get that SIGSTOP). */ |
57380f4e | 2831 | stop_wait_callback (lp, NULL); |
710151dd | 2832 | |
7feb7d06 PA |
2833 | /* Hold the SIGTRAP for handling by linux_nat_wait. If |
2834 | there's another event, throw it back into the | |
1777feb0 | 2835 | queue. */ |
7feb7d06 | 2836 | if (lp->status) |
710151dd | 2837 | { |
7feb7d06 PA |
2838 | if (debug_linux_nat) |
2839 | fprintf_unfiltered (gdb_stdlog, | |
2840 | "SWC: kill %s, %s\n", | |
2841 | target_pid_to_str (lp->ptid), | |
2842 | status_to_str ((int) status)); | |
2843 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2844 | } |
7feb7d06 | 2845 | |
1777feb0 | 2846 | /* Save the sigtrap event. */ |
7feb7d06 | 2847 | lp->status = status; |
d6b0e80f AC |
2848 | return 0; |
2849 | } | |
2850 | else | |
2851 | { | |
2852 | /* The thread was stopped with a signal other than | |
1777feb0 | 2853 | SIGSTOP, and didn't accidentally trip a breakpoint. */ |
d6b0e80f AC |
2854 | |
2855 | if (debug_linux_nat) | |
2856 | { | |
2857 | fprintf_unfiltered (gdb_stdlog, | |
2858 | "SWC: Pending event %s in %s\n", | |
2859 | status_to_str ((int) status), | |
2860 | target_pid_to_str (lp->ptid)); | |
2861 | } | |
1777feb0 | 2862 | /* Now resume this LWP and get the SIGSTOP event. */ |
d6b0e80f AC |
2863 | errno = 0; |
2864 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2865 | if (debug_linux_nat) | |
2866 | fprintf_unfiltered (gdb_stdlog, | |
2867 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2868 | target_pid_to_str (lp->ptid), | |
2869 | errno ? safe_strerror (errno) : "OK"); | |
2870 | ||
2871 | /* Hold this event/waitstatus while we check to see if | |
1777feb0 | 2872 | there are any more (we still want to get that SIGSTOP). */ |
57380f4e | 2873 | stop_wait_callback (lp, NULL); |
710151dd PA |
2874 | |
2875 | /* If the lp->status field is still empty, use it to | |
2876 | hold this event. If not, then this event must be | |
2877 | returned to the event queue of the LWP. */ | |
7feb7d06 | 2878 | if (lp->status) |
d6b0e80f AC |
2879 | { |
2880 | if (debug_linux_nat) | |
2881 | { | |
2882 | fprintf_unfiltered (gdb_stdlog, | |
2883 | "SWC: kill %s, %s\n", | |
2884 | target_pid_to_str (lp->ptid), | |
2885 | status_to_str ((int) status)); | |
2886 | } | |
2887 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2888 | } | |
710151dd PA |
2889 | else |
2890 | lp->status = status; | |
d6b0e80f AC |
2891 | return 0; |
2892 | } | |
2893 | } | |
2894 | else | |
2895 | { | |
2896 | /* We caught the SIGSTOP that we intended to catch, so | |
2897 | there's no SIGSTOP pending. */ | |
2898 | lp->stopped = 1; | |
2899 | lp->signalled = 0; | |
2900 | } | |
2901 | } | |
2902 | ||
2903 | return 0; | |
2904 | } | |
2905 | ||
d6b0e80f AC |
2906 | /* Return non-zero if LP has a wait status pending. */ |
2907 | ||
2908 | static int | |
2909 | status_callback (struct lwp_info *lp, void *data) | |
2910 | { | |
2911 | /* Only report a pending wait status if we pretend that this has | |
2912 | indeed been resumed. */ | |
ca2163eb PA |
2913 | if (!lp->resumed) |
2914 | return 0; | |
2915 | ||
2916 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2917 | { | |
2918 | /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event, | |
766062f6 | 2919 | or a pending process exit. Note that `W_EXITCODE(0,0) == |
ca2163eb PA |
2920 | 0', so a clean process exit can not be stored pending in |
2921 | lp->status, it is indistinguishable from | |
2922 | no-pending-status. */ | |
2923 | return 1; | |
2924 | } | |
2925 | ||
2926 | if (lp->status != 0) | |
2927 | return 1; | |
2928 | ||
2929 | return 0; | |
d6b0e80f AC |
2930 | } |
2931 | ||
2932 | /* Return non-zero if LP isn't stopped. */ | |
2933 | ||
2934 | static int | |
2935 | running_callback (struct lwp_info *lp, void *data) | |
2936 | { | |
25289eb2 PA |
2937 | return (!lp->stopped |
2938 | || ((lp->status != 0 | |
2939 | || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2940 | && lp->resumed)); | |
d6b0e80f AC |
2941 | } |
2942 | ||
2943 | /* Count the LWP's that have had events. */ | |
2944 | ||
2945 | static int | |
2946 | count_events_callback (struct lwp_info *lp, void *data) | |
2947 | { | |
2948 | int *count = data; | |
2949 | ||
2950 | gdb_assert (count != NULL); | |
2951 | ||
e09490f1 | 2952 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
00390b84 | 2953 | if (lp->resumed && linux_nat_lp_status_is_event (lp)) |
d6b0e80f AC |
2954 | (*count)++; |
2955 | ||
2956 | return 0; | |
2957 | } | |
2958 | ||
2959 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2960 | ||
2961 | static int | |
2962 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2963 | { | |
25289eb2 PA |
2964 | if (lp->last_resume_kind == resume_step |
2965 | && lp->status != 0) | |
d6b0e80f AC |
2966 | return 1; |
2967 | else | |
2968 | return 0; | |
2969 | } | |
2970 | ||
2971 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2972 | ||
2973 | static int | |
2974 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2975 | { | |
2976 | int *selector = data; | |
2977 | ||
2978 | gdb_assert (selector != NULL); | |
2979 | ||
1777feb0 | 2980 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
00390b84 | 2981 | if (lp->resumed && linux_nat_lp_status_is_event (lp)) |
d6b0e80f AC |
2982 | if ((*selector)-- == 0) |
2983 | return 1; | |
2984 | ||
2985 | return 0; | |
2986 | } | |
2987 | ||
710151dd PA |
2988 | static int |
2989 | cancel_breakpoint (struct lwp_info *lp) | |
2990 | { | |
2991 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2992 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2993 | LWP. We will handle the current event, eventually we will resume | |
2994 | this LWP, and this breakpoint will trap again. | |
2995 | ||
2996 | If we do not do this, then we run the risk that the user will | |
2997 | delete or disable the breakpoint, but the LWP will have already | |
2998 | tripped on it. */ | |
2999 | ||
515630c5 UW |
3000 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
3001 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3002 | CORE_ADDR pc; | |
3003 | ||
3004 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
6c95b8df | 3005 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) |
710151dd PA |
3006 | { |
3007 | if (debug_linux_nat) | |
3008 | fprintf_unfiltered (gdb_stdlog, | |
3009 | "CB: Push back breakpoint for %s\n", | |
3010 | target_pid_to_str (lp->ptid)); | |
3011 | ||
3012 | /* Back up the PC if necessary. */ | |
515630c5 UW |
3013 | if (gdbarch_decr_pc_after_break (gdbarch)) |
3014 | regcache_write_pc (regcache, pc); | |
3015 | ||
710151dd PA |
3016 | return 1; |
3017 | } | |
3018 | return 0; | |
3019 | } | |
3020 | ||
d6b0e80f AC |
3021 | static int |
3022 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
3023 | { | |
3024 | struct lwp_info *event_lp = data; | |
3025 | ||
3026 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
3027 | if (lp == event_lp) | |
3028 | return 0; | |
3029 | ||
3030 | /* If a LWP other than the LWP that we're reporting an event for has | |
3031 | hit a GDB breakpoint (as opposed to some random trap signal), | |
3032 | then just arrange for it to hit it again later. We don't keep | |
3033 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
3034 | LWP. We will handle the current event, eventually we will resume | |
3035 | all LWPs, and this one will get its breakpoint trap again. | |
3036 | ||
3037 | If we do not do this, then we run the risk that the user will | |
3038 | delete or disable the breakpoint, but the LWP will have already | |
3039 | tripped on it. */ | |
3040 | ||
00390b84 | 3041 | if (linux_nat_lp_status_is_event (lp) |
710151dd PA |
3042 | && cancel_breakpoint (lp)) |
3043 | /* Throw away the SIGTRAP. */ | |
3044 | lp->status = 0; | |
d6b0e80f AC |
3045 | |
3046 | return 0; | |
3047 | } | |
3048 | ||
3049 | /* Select one LWP out of those that have events pending. */ | |
3050 | ||
3051 | static void | |
d90e17a7 | 3052 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
3053 | { |
3054 | int num_events = 0; | |
3055 | int random_selector; | |
3056 | struct lwp_info *event_lp; | |
3057 | ||
ac264b3b | 3058 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
3059 | (*orig_lp)->status = *status; |
3060 | ||
3061 | /* Give preference to any LWP that is being single-stepped. */ | |
d90e17a7 PA |
3062 | event_lp = iterate_over_lwps (filter, |
3063 | select_singlestep_lwp_callback, NULL); | |
d6b0e80f AC |
3064 | if (event_lp != NULL) |
3065 | { | |
3066 | if (debug_linux_nat) | |
3067 | fprintf_unfiltered (gdb_stdlog, | |
3068 | "SEL: Select single-step %s\n", | |
3069 | target_pid_to_str (event_lp->ptid)); | |
3070 | } | |
3071 | else | |
3072 | { | |
3073 | /* No single-stepping LWP. Select one at random, out of those | |
3074 | which have had SIGTRAP events. */ | |
3075 | ||
3076 | /* First see how many SIGTRAP events we have. */ | |
d90e17a7 | 3077 | iterate_over_lwps (filter, count_events_callback, &num_events); |
d6b0e80f AC |
3078 | |
3079 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
3080 | random_selector = (int) | |
3081 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
3082 | ||
3083 | if (debug_linux_nat && num_events > 1) | |
3084 | fprintf_unfiltered (gdb_stdlog, | |
3085 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
3086 | num_events, random_selector); | |
3087 | ||
d90e17a7 PA |
3088 | event_lp = iterate_over_lwps (filter, |
3089 | select_event_lwp_callback, | |
d6b0e80f AC |
3090 | &random_selector); |
3091 | } | |
3092 | ||
3093 | if (event_lp != NULL) | |
3094 | { | |
3095 | /* Switch the event LWP. */ | |
3096 | *orig_lp = event_lp; | |
3097 | *status = event_lp->status; | |
3098 | } | |
3099 | ||
3100 | /* Flush the wait status for the event LWP. */ | |
3101 | (*orig_lp)->status = 0; | |
3102 | } | |
3103 | ||
3104 | /* Return non-zero if LP has been resumed. */ | |
3105 | ||
3106 | static int | |
3107 | resumed_callback (struct lwp_info *lp, void *data) | |
3108 | { | |
3109 | return lp->resumed; | |
3110 | } | |
3111 | ||
12d9289a PA |
3112 | /* Stop an active thread, verify it still exists, then resume it. If |
3113 | the thread ends up with a pending status, then it is not resumed, | |
3114 | and *DATA (really a pointer to int), is set. */ | |
d6b0e80f AC |
3115 | |
3116 | static int | |
3117 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
3118 | { | |
12d9289a PA |
3119 | int *new_pending_p = data; |
3120 | ||
25289eb2 | 3121 | if (!lp->stopped) |
d6b0e80f | 3122 | { |
25289eb2 PA |
3123 | ptid_t ptid = lp->ptid; |
3124 | ||
d6b0e80f AC |
3125 | stop_callback (lp, NULL); |
3126 | stop_wait_callback (lp, NULL); | |
25289eb2 PA |
3127 | |
3128 | /* Resume if the lwp still exists, and the core wanted it | |
3129 | running. */ | |
12d9289a PA |
3130 | lp = find_lwp_pid (ptid); |
3131 | if (lp != NULL) | |
25289eb2 | 3132 | { |
12d9289a PA |
3133 | if (lp->last_resume_kind == resume_stop |
3134 | && lp->status == 0) | |
3135 | { | |
3136 | /* The core wanted the LWP to stop. Even if it stopped | |
3137 | cleanly (with SIGSTOP), leave the event pending. */ | |
3138 | if (debug_linux_nat) | |
3139 | fprintf_unfiltered (gdb_stdlog, | |
3140 | "SARC: core wanted LWP %ld stopped " | |
3141 | "(leaving SIGSTOP pending)\n", | |
3142 | GET_LWP (lp->ptid)); | |
3143 | lp->status = W_STOPCODE (SIGSTOP); | |
3144 | } | |
3145 | ||
3146 | if (lp->status == 0) | |
3147 | { | |
3148 | if (debug_linux_nat) | |
3149 | fprintf_unfiltered (gdb_stdlog, | |
3150 | "SARC: re-resuming LWP %ld\n", | |
3151 | GET_LWP (lp->ptid)); | |
3152 | resume_lwp (lp, lp->step); | |
3153 | } | |
3154 | else | |
3155 | { | |
3156 | if (debug_linux_nat) | |
3157 | fprintf_unfiltered (gdb_stdlog, | |
3158 | "SARC: not re-resuming LWP %ld " | |
3159 | "(has pending)\n", | |
3160 | GET_LWP (lp->ptid)); | |
3161 | if (new_pending_p) | |
3162 | *new_pending_p = 1; | |
3163 | } | |
25289eb2 | 3164 | } |
d6b0e80f AC |
3165 | } |
3166 | return 0; | |
3167 | } | |
3168 | ||
02f3fc28 | 3169 | /* Check if we should go on and pass this event to common code. |
12d9289a PA |
3170 | Return the affected lwp if we are, or NULL otherwise. If we stop |
3171 | all lwps temporarily, we may end up with new pending events in some | |
3172 | other lwp. In that case set *NEW_PENDING_P to true. */ | |
3173 | ||
02f3fc28 | 3174 | static struct lwp_info * |
12d9289a | 3175 | linux_nat_filter_event (int lwpid, int status, int options, int *new_pending_p) |
02f3fc28 PA |
3176 | { |
3177 | struct lwp_info *lp; | |
3178 | ||
12d9289a PA |
3179 | *new_pending_p = 0; |
3180 | ||
02f3fc28 PA |
3181 | lp = find_lwp_pid (pid_to_ptid (lwpid)); |
3182 | ||
3183 | /* Check for stop events reported by a process we didn't already | |
3184 | know about - anything not already in our LWP list. | |
3185 | ||
3186 | If we're expecting to receive stopped processes after | |
3187 | fork, vfork, and clone events, then we'll just add the | |
3188 | new one to our list and go back to waiting for the event | |
3189 | to be reported - the stopped process might be returned | |
3190 | from waitpid before or after the event is. */ | |
3191 | if (WIFSTOPPED (status) && !lp) | |
3192 | { | |
84636d28 | 3193 | add_to_pid_list (&stopped_pids, lwpid, status); |
02f3fc28 PA |
3194 | return NULL; |
3195 | } | |
3196 | ||
3197 | /* Make sure we don't report an event for the exit of an LWP not in | |
1777feb0 | 3198 | our list, i.e. not part of the current process. This can happen |
fd62cb89 | 3199 | if we detach from a program we originally forked and then it |
02f3fc28 PA |
3200 | exits. */ |
3201 | if (!WIFSTOPPED (status) && !lp) | |
3202 | return NULL; | |
3203 | ||
3204 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
3205 | CLONE_PTRACE processes which do not use the thread library - | |
3206 | otherwise we wouldn't find the new LWP this way. That doesn't | |
3207 | currently work, and the following code is currently unreachable | |
3208 | due to the two blocks above. If it's fixed some day, this code | |
3209 | should be broken out into a function so that we can also pick up | |
3210 | LWPs from the new interface. */ | |
3211 | if (!lp) | |
3212 | { | |
3213 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
3214 | if (options & __WCLONE) | |
3215 | lp->cloned = 1; | |
3216 | ||
3217 | gdb_assert (WIFSTOPPED (status) | |
3218 | && WSTOPSIG (status) == SIGSTOP); | |
3219 | lp->signalled = 1; | |
3220 | ||
3221 | if (!in_thread_list (inferior_ptid)) | |
3222 | { | |
3223 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
3224 | GET_PID (inferior_ptid)); | |
3225 | add_thread (inferior_ptid); | |
3226 | } | |
3227 | ||
3228 | add_thread (lp->ptid); | |
3229 | } | |
3230 | ||
ca2163eb PA |
3231 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
3232 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
3233 | { | |
3234 | /* No longer need the sysgood bit. The ptrace event ends up | |
3235 | recorded in lp->waitstatus if we care for it. We can carry | |
3236 | on handling the event like a regular SIGTRAP from here | |
3237 | on. */ | |
3238 | status = W_STOPCODE (SIGTRAP); | |
3239 | if (linux_handle_syscall_trap (lp, 0)) | |
3240 | return NULL; | |
3241 | } | |
02f3fc28 | 3242 | |
ca2163eb PA |
3243 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
3244 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
02f3fc28 PA |
3245 | { |
3246 | if (debug_linux_nat) | |
3247 | fprintf_unfiltered (gdb_stdlog, | |
3248 | "LLW: Handling extended status 0x%06x\n", | |
3249 | status); | |
3250 | if (linux_handle_extended_wait (lp, status, 0)) | |
3251 | return NULL; | |
3252 | } | |
3253 | ||
26ab7092 | 3254 | if (linux_nat_status_is_event (status)) |
ebec9a0f PA |
3255 | { |
3256 | /* Save the trap's siginfo in case we need it later. */ | |
3257 | save_siginfo (lp); | |
3258 | ||
3259 | save_sigtrap (lp); | |
3260 | } | |
ca2163eb | 3261 | |
02f3fc28 | 3262 | /* Check if the thread has exited. */ |
d90e17a7 PA |
3263 | if ((WIFEXITED (status) || WIFSIGNALED (status)) |
3264 | && num_lwps (GET_PID (lp->ptid)) > 1) | |
02f3fc28 | 3265 | { |
9db03742 JB |
3266 | /* If this is the main thread, we must stop all threads and verify |
3267 | if they are still alive. This is because in the nptl thread model | |
3268 | on Linux 2.4, there is no signal issued for exiting LWPs | |
02f3fc28 PA |
3269 | other than the main thread. We only get the main thread exit |
3270 | signal once all child threads have already exited. If we | |
3271 | stop all the threads and use the stop_wait_callback to check | |
3272 | if they have exited we can determine whether this signal | |
3273 | should be ignored or whether it means the end of the debugged | |
3274 | application, regardless of which threading model is being | |
5d3b6af6 | 3275 | used. */ |
02f3fc28 PA |
3276 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) |
3277 | { | |
3278 | lp->stopped = 1; | |
d90e17a7 | 3279 | iterate_over_lwps (pid_to_ptid (GET_PID (lp->ptid)), |
12d9289a | 3280 | stop_and_resume_callback, new_pending_p); |
02f3fc28 PA |
3281 | } |
3282 | ||
3283 | if (debug_linux_nat) | |
3284 | fprintf_unfiltered (gdb_stdlog, | |
3285 | "LLW: %s exited.\n", | |
3286 | target_pid_to_str (lp->ptid)); | |
3287 | ||
d90e17a7 | 3288 | if (num_lwps (GET_PID (lp->ptid)) > 1) |
9db03742 JB |
3289 | { |
3290 | /* If there is at least one more LWP, then the exit signal | |
3291 | was not the end of the debugged application and should be | |
3292 | ignored. */ | |
3293 | exit_lwp (lp); | |
3294 | return NULL; | |
3295 | } | |
02f3fc28 PA |
3296 | } |
3297 | ||
3298 | /* Check if the current LWP has previously exited. In the nptl | |
3299 | thread model, LWPs other than the main thread do not issue | |
3300 | signals when they exit so we must check whenever the thread has | |
3301 | stopped. A similar check is made in stop_wait_callback(). */ | |
d90e17a7 | 3302 | if (num_lwps (GET_PID (lp->ptid)) > 1 && !linux_thread_alive (lp->ptid)) |
02f3fc28 | 3303 | { |
d90e17a7 PA |
3304 | ptid_t ptid = pid_to_ptid (GET_PID (lp->ptid)); |
3305 | ||
02f3fc28 PA |
3306 | if (debug_linux_nat) |
3307 | fprintf_unfiltered (gdb_stdlog, | |
3308 | "LLW: %s exited.\n", | |
3309 | target_pid_to_str (lp->ptid)); | |
3310 | ||
3311 | exit_lwp (lp); | |
3312 | ||
3313 | /* Make sure there is at least one thread running. */ | |
d90e17a7 | 3314 | gdb_assert (iterate_over_lwps (ptid, running_callback, NULL)); |
02f3fc28 PA |
3315 | |
3316 | /* Discard the event. */ | |
3317 | return NULL; | |
3318 | } | |
3319 | ||
3320 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
3321 | an attempt to stop an LWP. */ | |
3322 | if (lp->signalled | |
3323 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
3324 | { | |
3325 | if (debug_linux_nat) | |
3326 | fprintf_unfiltered (gdb_stdlog, | |
3327 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
3328 | target_pid_to_str (lp->ptid)); | |
3329 | ||
02f3fc28 PA |
3330 | lp->signalled = 0; |
3331 | ||
25289eb2 PA |
3332 | if (lp->last_resume_kind != resume_stop) |
3333 | { | |
3334 | /* This is a delayed SIGSTOP. */ | |
02f3fc28 | 3335 | |
25289eb2 PA |
3336 | registers_changed (); |
3337 | ||
3338 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
02f3fc28 | 3339 | lp->step, TARGET_SIGNAL_0); |
25289eb2 PA |
3340 | if (debug_linux_nat) |
3341 | fprintf_unfiltered (gdb_stdlog, | |
3342 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
3343 | lp->step ? | |
3344 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3345 | target_pid_to_str (lp->ptid)); | |
02f3fc28 | 3346 | |
25289eb2 PA |
3347 | lp->stopped = 0; |
3348 | gdb_assert (lp->resumed); | |
02f3fc28 | 3349 | |
25289eb2 PA |
3350 | /* Discard the event. */ |
3351 | return NULL; | |
3352 | } | |
02f3fc28 PA |
3353 | } |
3354 | ||
57380f4e DJ |
3355 | /* Make sure we don't report a SIGINT that we have already displayed |
3356 | for another thread. */ | |
3357 | if (lp->ignore_sigint | |
3358 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
3359 | { | |
3360 | if (debug_linux_nat) | |
3361 | fprintf_unfiltered (gdb_stdlog, | |
3362 | "LLW: Delayed SIGINT caught for %s.\n", | |
3363 | target_pid_to_str (lp->ptid)); | |
3364 | ||
3365 | /* This is a delayed SIGINT. */ | |
3366 | lp->ignore_sigint = 0; | |
3367 | ||
3368 | registers_changed (); | |
28439f5e | 3369 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
57380f4e DJ |
3370 | lp->step, TARGET_SIGNAL_0); |
3371 | if (debug_linux_nat) | |
3372 | fprintf_unfiltered (gdb_stdlog, | |
3373 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
3374 | lp->step ? | |
3375 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3376 | target_pid_to_str (lp->ptid)); | |
3377 | ||
3378 | lp->stopped = 0; | |
3379 | gdb_assert (lp->resumed); | |
3380 | ||
3381 | /* Discard the event. */ | |
3382 | return NULL; | |
3383 | } | |
3384 | ||
02f3fc28 PA |
3385 | /* An interesting event. */ |
3386 | gdb_assert (lp); | |
ca2163eb | 3387 | lp->status = status; |
02f3fc28 PA |
3388 | return lp; |
3389 | } | |
3390 | ||
d6b0e80f | 3391 | static ptid_t |
7feb7d06 | 3392 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
3393 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3394 | int target_options) | |
d6b0e80f | 3395 | { |
7feb7d06 | 3396 | static sigset_t prev_mask; |
4b60df3d | 3397 | enum resume_kind last_resume_kind; |
12d9289a PA |
3398 | struct lwp_info *lp; |
3399 | int options; | |
3400 | int status; | |
d90e17a7 | 3401 | pid_t pid; |
d6b0e80f | 3402 | |
01124a23 | 3403 | if (debug_linux_nat) |
b84876c2 PA |
3404 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); |
3405 | ||
f973ed9c DJ |
3406 | /* The first time we get here after starting a new inferior, we may |
3407 | not have added it to the LWP list yet - this is the earliest | |
3408 | moment at which we know its PID. */ | |
d90e17a7 | 3409 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 3410 | { |
27c9d204 PA |
3411 | /* Upgrade the main thread's ptid. */ |
3412 | thread_change_ptid (inferior_ptid, | |
3413 | BUILD_LWP (GET_PID (inferior_ptid), | |
3414 | GET_PID (inferior_ptid))); | |
3415 | ||
f973ed9c DJ |
3416 | lp = add_lwp (inferior_ptid); |
3417 | lp->resumed = 1; | |
3418 | } | |
3419 | ||
7feb7d06 PA |
3420 | /* Make sure SIGCHLD is blocked. */ |
3421 | block_child_signals (&prev_mask); | |
d6b0e80f | 3422 | |
d90e17a7 PA |
3423 | if (ptid_equal (ptid, minus_one_ptid)) |
3424 | pid = -1; | |
3425 | else if (ptid_is_pid (ptid)) | |
3426 | /* A request to wait for a specific tgid. This is not possible | |
3427 | with waitpid, so instead, we wait for any child, and leave | |
3428 | children we're not interested in right now with a pending | |
3429 | status to report later. */ | |
3430 | pid = -1; | |
3431 | else | |
3432 | pid = GET_LWP (ptid); | |
3433 | ||
d6b0e80f | 3434 | retry: |
d90e17a7 PA |
3435 | lp = NULL; |
3436 | status = 0; | |
12d9289a | 3437 | options = 0; |
d6b0e80f | 3438 | |
e3e9f5a2 PA |
3439 | /* Make sure that of those LWPs we want to get an event from, there |
3440 | is at least one LWP that has been resumed. If there's none, just | |
3441 | bail out. The core may just be flushing asynchronously all | |
3442 | events. */ | |
3443 | if (iterate_over_lwps (ptid, resumed_callback, NULL) == NULL) | |
3444 | { | |
3445 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3446 | ||
01124a23 | 3447 | if (debug_linux_nat) |
e3e9f5a2 PA |
3448 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (no resumed LWP)\n"); |
3449 | ||
3450 | restore_child_signals_mask (&prev_mask); | |
3451 | return minus_one_ptid; | |
3452 | } | |
d6b0e80f AC |
3453 | |
3454 | /* First check if there is a LWP with a wait status pending. */ | |
3455 | if (pid == -1) | |
3456 | { | |
3457 | /* Any LWP that's been resumed will do. */ | |
d90e17a7 | 3458 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
d6b0e80f AC |
3459 | if (lp) |
3460 | { | |
ca2163eb | 3461 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3462 | fprintf_unfiltered (gdb_stdlog, |
3463 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3464 | status_to_str (lp->status), |
d6b0e80f AC |
3465 | target_pid_to_str (lp->ptid)); |
3466 | } | |
3467 | ||
b84876c2 | 3468 | /* But if we don't find one, we'll have to wait, and check both |
7feb7d06 PA |
3469 | cloned and uncloned processes. We start with the cloned |
3470 | processes. */ | |
d6b0e80f AC |
3471 | options = __WCLONE | WNOHANG; |
3472 | } | |
3473 | else if (is_lwp (ptid)) | |
3474 | { | |
3475 | if (debug_linux_nat) | |
3476 | fprintf_unfiltered (gdb_stdlog, | |
3477 | "LLW: Waiting for specific LWP %s.\n", | |
3478 | target_pid_to_str (ptid)); | |
3479 | ||
3480 | /* We have a specific LWP to check. */ | |
3481 | lp = find_lwp_pid (ptid); | |
3482 | gdb_assert (lp); | |
d6b0e80f | 3483 | |
ca2163eb | 3484 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3485 | fprintf_unfiltered (gdb_stdlog, |
3486 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3487 | status_to_str (lp->status), |
d6b0e80f AC |
3488 | target_pid_to_str (lp->ptid)); |
3489 | ||
3490 | /* If we have to wait, take into account whether PID is a cloned | |
3491 | process or not. And we have to convert it to something that | |
3492 | the layer beneath us can understand. */ | |
3493 | options = lp->cloned ? __WCLONE : 0; | |
3494 | pid = GET_LWP (ptid); | |
d90e17a7 PA |
3495 | |
3496 | /* We check for lp->waitstatus in addition to lp->status, | |
3497 | because we can have pending process exits recorded in | |
3498 | lp->status and W_EXITCODE(0,0) == 0. We should probably have | |
3499 | an additional lp->status_p flag. */ | |
ca2163eb | 3500 | if (lp->status == 0 && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) |
d90e17a7 | 3501 | lp = NULL; |
d6b0e80f AC |
3502 | } |
3503 | ||
25289eb2 | 3504 | if (lp && lp->signalled && lp->last_resume_kind != resume_stop) |
d6b0e80f AC |
3505 | { |
3506 | /* A pending SIGSTOP may interfere with the normal stream of | |
3507 | events. In a typical case where interference is a problem, | |
3508 | we have a SIGSTOP signal pending for LWP A while | |
3509 | single-stepping it, encounter an event in LWP B, and take the | |
3510 | pending SIGSTOP while trying to stop LWP A. After processing | |
3511 | the event in LWP B, LWP A is continued, and we'll never see | |
3512 | the SIGTRAP associated with the last time we were | |
3513 | single-stepping LWP A. */ | |
3514 | ||
3515 | /* Resume the thread. It should halt immediately returning the | |
3516 | pending SIGSTOP. */ | |
3517 | registers_changed (); | |
28439f5e | 3518 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3519 | lp->step, TARGET_SIGNAL_0); |
d6b0e80f AC |
3520 | if (debug_linux_nat) |
3521 | fprintf_unfiltered (gdb_stdlog, | |
3522 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
3523 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3524 | target_pid_to_str (lp->ptid)); | |
3525 | lp->stopped = 0; | |
3526 | gdb_assert (lp->resumed); | |
3527 | ||
ca2163eb PA |
3528 | /* Catch the pending SIGSTOP. */ |
3529 | status = lp->status; | |
3530 | lp->status = 0; | |
3531 | ||
d6b0e80f | 3532 | stop_wait_callback (lp, NULL); |
ca2163eb PA |
3533 | |
3534 | /* If the lp->status field isn't empty, we caught another signal | |
3535 | while flushing the SIGSTOP. Return it back to the event | |
3536 | queue of the LWP, as we already have an event to handle. */ | |
3537 | if (lp->status) | |
3538 | { | |
3539 | if (debug_linux_nat) | |
3540 | fprintf_unfiltered (gdb_stdlog, | |
3541 | "LLW: kill %s, %s\n", | |
3542 | target_pid_to_str (lp->ptid), | |
3543 | status_to_str (lp->status)); | |
3544 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
3545 | } | |
3546 | ||
3547 | lp->status = status; | |
d6b0e80f AC |
3548 | } |
3549 | ||
b84876c2 PA |
3550 | if (!target_can_async_p ()) |
3551 | { | |
3552 | /* Causes SIGINT to be passed on to the attached process. */ | |
3553 | set_sigint_trap (); | |
b84876c2 | 3554 | } |
d6b0e80f | 3555 | |
47608cb1 PA |
3556 | /* Translate generic target_wait options into waitpid options. */ |
3557 | if (target_options & TARGET_WNOHANG) | |
3558 | options |= WNOHANG; | |
7feb7d06 | 3559 | |
d90e17a7 | 3560 | while (lp == NULL) |
d6b0e80f AC |
3561 | { |
3562 | pid_t lwpid; | |
3563 | ||
7feb7d06 | 3564 | lwpid = my_waitpid (pid, &status, options); |
b84876c2 | 3565 | |
d6b0e80f AC |
3566 | if (lwpid > 0) |
3567 | { | |
12d9289a PA |
3568 | /* If this is true, then we paused LWPs momentarily, and may |
3569 | now have pending events to handle. */ | |
3570 | int new_pending; | |
3571 | ||
d6b0e80f AC |
3572 | gdb_assert (pid == -1 || lwpid == pid); |
3573 | ||
3574 | if (debug_linux_nat) | |
3575 | { | |
3576 | fprintf_unfiltered (gdb_stdlog, | |
3577 | "LLW: waitpid %ld received %s\n", | |
3578 | (long) lwpid, status_to_str (status)); | |
3579 | } | |
3580 | ||
12d9289a | 3581 | lp = linux_nat_filter_event (lwpid, status, options, &new_pending); |
d90e17a7 | 3582 | |
33355866 JK |
3583 | /* STATUS is now no longer valid, use LP->STATUS instead. */ |
3584 | status = 0; | |
3585 | ||
d90e17a7 PA |
3586 | if (lp |
3587 | && ptid_is_pid (ptid) | |
3588 | && ptid_get_pid (lp->ptid) != ptid_get_pid (ptid)) | |
d6b0e80f | 3589 | { |
e3e9f5a2 PA |
3590 | gdb_assert (lp->resumed); |
3591 | ||
d90e17a7 | 3592 | if (debug_linux_nat) |
3e43a32a MS |
3593 | fprintf (stderr, |
3594 | "LWP %ld got an event %06x, leaving pending.\n", | |
33355866 | 3595 | ptid_get_lwp (lp->ptid), lp->status); |
d90e17a7 | 3596 | |
ca2163eb | 3597 | if (WIFSTOPPED (lp->status)) |
d90e17a7 | 3598 | { |
ca2163eb | 3599 | if (WSTOPSIG (lp->status) != SIGSTOP) |
d90e17a7 | 3600 | { |
e3e9f5a2 PA |
3601 | /* Cancel breakpoint hits. The breakpoint may |
3602 | be removed before we fetch events from this | |
3603 | process to report to the core. It is best | |
3604 | not to assume the moribund breakpoints | |
3605 | heuristic always handles these cases --- it | |
3606 | could be too many events go through to the | |
3607 | core before this one is handled. All-stop | |
3608 | always cancels breakpoint hits in all | |
3609 | threads. */ | |
3610 | if (non_stop | |
00390b84 | 3611 | && linux_nat_lp_status_is_event (lp) |
e3e9f5a2 PA |
3612 | && cancel_breakpoint (lp)) |
3613 | { | |
3614 | /* Throw away the SIGTRAP. */ | |
3615 | lp->status = 0; | |
3616 | ||
3617 | if (debug_linux_nat) | |
3618 | fprintf (stderr, | |
3e43a32a MS |
3619 | "LLW: LWP %ld hit a breakpoint while" |
3620 | " waiting for another process;" | |
3621 | " cancelled it\n", | |
e3e9f5a2 PA |
3622 | ptid_get_lwp (lp->ptid)); |
3623 | } | |
3624 | lp->stopped = 1; | |
d90e17a7 PA |
3625 | } |
3626 | else | |
3627 | { | |
3628 | lp->stopped = 1; | |
3629 | lp->signalled = 0; | |
3630 | } | |
3631 | } | |
33355866 | 3632 | else if (WIFEXITED (lp->status) || WIFSIGNALED (lp->status)) |
d90e17a7 PA |
3633 | { |
3634 | if (debug_linux_nat) | |
3e43a32a MS |
3635 | fprintf (stderr, |
3636 | "Process %ld exited while stopping LWPs\n", | |
d90e17a7 PA |
3637 | ptid_get_lwp (lp->ptid)); |
3638 | ||
3639 | /* This was the last lwp in the process. Since | |
3640 | events are serialized to GDB core, and we can't | |
3641 | report this one right now, but GDB core and the | |
3642 | other target layers will want to be notified | |
3643 | about the exit code/signal, leave the status | |
3644 | pending for the next time we're able to report | |
3645 | it. */ | |
d90e17a7 PA |
3646 | |
3647 | /* Prevent trying to stop this thread again. We'll | |
3648 | never try to resume it because it has a pending | |
3649 | status. */ | |
3650 | lp->stopped = 1; | |
3651 | ||
3652 | /* Dead LWP's aren't expected to reported a pending | |
3653 | sigstop. */ | |
3654 | lp->signalled = 0; | |
3655 | ||
3656 | /* Store the pending event in the waitstatus as | |
3657 | well, because W_EXITCODE(0,0) == 0. */ | |
ca2163eb | 3658 | store_waitstatus (&lp->waitstatus, lp->status); |
d90e17a7 PA |
3659 | } |
3660 | ||
12d9289a PA |
3661 | if (new_pending) |
3662 | goto retry; | |
3663 | ||
d90e17a7 PA |
3664 | /* Keep looking. */ |
3665 | lp = NULL; | |
d6b0e80f AC |
3666 | continue; |
3667 | } | |
3668 | ||
d90e17a7 PA |
3669 | if (lp) |
3670 | break; | |
3671 | else | |
3672 | { | |
12d9289a PA |
3673 | if (new_pending) |
3674 | goto retry; | |
3675 | ||
d90e17a7 PA |
3676 | if (pid == -1) |
3677 | { | |
3678 | /* waitpid did return something. Restart over. */ | |
3679 | options |= __WCLONE; | |
3680 | } | |
3681 | continue; | |
3682 | } | |
d6b0e80f AC |
3683 | } |
3684 | ||
3685 | if (pid == -1) | |
3686 | { | |
3687 | /* Alternate between checking cloned and uncloned processes. */ | |
3688 | options ^= __WCLONE; | |
3689 | ||
b84876c2 PA |
3690 | /* And every time we have checked both: |
3691 | In async mode, return to event loop; | |
3692 | In sync mode, suspend waiting for a SIGCHLD signal. */ | |
d6b0e80f | 3693 | if (options & __WCLONE) |
b84876c2 | 3694 | { |
47608cb1 | 3695 | if (target_options & TARGET_WNOHANG) |
b84876c2 PA |
3696 | { |
3697 | /* No interesting event. */ | |
3698 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3699 | ||
01124a23 | 3700 | if (debug_linux_nat) |
b84876c2 PA |
3701 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); |
3702 | ||
7feb7d06 | 3703 | restore_child_signals_mask (&prev_mask); |
b84876c2 PA |
3704 | return minus_one_ptid; |
3705 | } | |
3706 | ||
3707 | sigsuspend (&suspend_mask); | |
3708 | } | |
d6b0e80f | 3709 | } |
28736962 PA |
3710 | else if (target_options & TARGET_WNOHANG) |
3711 | { | |
3712 | /* No interesting event for PID yet. */ | |
3713 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3714 | ||
01124a23 | 3715 | if (debug_linux_nat) |
28736962 PA |
3716 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); |
3717 | ||
3718 | restore_child_signals_mask (&prev_mask); | |
3719 | return minus_one_ptid; | |
3720 | } | |
d6b0e80f AC |
3721 | |
3722 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 3723 | gdb_assert (lp == NULL); |
d6b0e80f AC |
3724 | } |
3725 | ||
b84876c2 | 3726 | if (!target_can_async_p ()) |
d26b5354 | 3727 | clear_sigint_trap (); |
d6b0e80f AC |
3728 | |
3729 | gdb_assert (lp); | |
3730 | ||
ca2163eb PA |
3731 | status = lp->status; |
3732 | lp->status = 0; | |
3733 | ||
d6b0e80f AC |
3734 | /* Don't report signals that GDB isn't interested in, such as |
3735 | signals that are neither printed nor stopped upon. Stopping all | |
3736 | threads can be a bit time-consuming so if we want decent | |
3737 | performance with heavily multi-threaded programs, especially when | |
3738 | they're using a high frequency timer, we'd better avoid it if we | |
3739 | can. */ | |
3740 | ||
3741 | if (WIFSTOPPED (status)) | |
3742 | { | |
423ec54c | 3743 | enum target_signal signo = target_signal_from_host (WSTOPSIG (status)); |
d6b0e80f | 3744 | |
2455069d UW |
3745 | /* When using hardware single-step, we need to report every signal. |
3746 | Otherwise, signals in pass_mask may be short-circuited. */ | |
d539ed7e | 3747 | if (!lp->step |
2455069d | 3748 | && WSTOPSIG (status) && sigismember (&pass_mask, WSTOPSIG (status))) |
d6b0e80f AC |
3749 | { |
3750 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
3751 | here? It is not clear we should. GDB may not expect | |
3752 | other threads to run. On the other hand, not resuming | |
3753 | newly attached threads may cause an unwanted delay in | |
3754 | getting them running. */ | |
3755 | registers_changed (); | |
28439f5e | 3756 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3757 | lp->step, signo); |
d6b0e80f AC |
3758 | if (debug_linux_nat) |
3759 | fprintf_unfiltered (gdb_stdlog, | |
3760 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3761 | lp->step ? | |
3762 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3763 | target_pid_to_str (lp->ptid), | |
423ec54c JK |
3764 | (signo != TARGET_SIGNAL_0 |
3765 | ? strsignal (target_signal_to_host (signo)) | |
3766 | : "0")); | |
d6b0e80f | 3767 | lp->stopped = 0; |
d6b0e80f AC |
3768 | goto retry; |
3769 | } | |
3770 | ||
1ad15515 | 3771 | if (!non_stop) |
d6b0e80f | 3772 | { |
1ad15515 PA |
3773 | /* Only do the below in all-stop, as we currently use SIGINT |
3774 | to implement target_stop (see linux_nat_stop) in | |
3775 | non-stop. */ | |
3776 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3777 | { | |
3778 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3779 | forwarded to the entire process group, that is, all LWPs | |
3780 | will receive it - unless they're using CLONE_THREAD to | |
3781 | share signals. Since we only want to report it once, we | |
3782 | mark it as ignored for all LWPs except this one. */ | |
d90e17a7 PA |
3783 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid)), |
3784 | set_ignore_sigint, NULL); | |
1ad15515 PA |
3785 | lp->ignore_sigint = 0; |
3786 | } | |
3787 | else | |
3788 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
3789 | } |
3790 | } | |
3791 | ||
3792 | /* This LWP is stopped now. */ | |
3793 | lp->stopped = 1; | |
3794 | ||
3795 | if (debug_linux_nat) | |
3796 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
3797 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
3798 | ||
4c28f408 PA |
3799 | if (!non_stop) |
3800 | { | |
3801 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3802 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3803 | |
3804 | /* ... and wait until all of them have reported back that | |
3805 | they're no longer running. */ | |
d90e17a7 | 3806 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
4c28f408 PA |
3807 | |
3808 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3809 | from among those that have had events. Giving equal priority | |
3810 | to all LWPs that have had events helps prevent | |
3811 | starvation. */ | |
3812 | if (pid == -1) | |
d90e17a7 | 3813 | select_event_lwp (ptid, &lp, &status); |
d6b0e80f | 3814 | |
e3e9f5a2 PA |
3815 | /* Now that we've selected our final event LWP, cancel any |
3816 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
3817 | See the comment in cancel_breakpoints_callback to find out | |
3818 | why. */ | |
3819 | iterate_over_lwps (minus_one_ptid, cancel_breakpoints_callback, lp); | |
3820 | ||
4b60df3d PA |
3821 | /* We'll need this to determine whether to report a SIGSTOP as |
3822 | TARGET_WAITKIND_0. Need to take a copy because | |
3823 | resume_clear_callback clears it. */ | |
3824 | last_resume_kind = lp->last_resume_kind; | |
3825 | ||
e3e9f5a2 PA |
3826 | /* In all-stop, from the core's perspective, all LWPs are now |
3827 | stopped until a new resume action is sent over. */ | |
3828 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
3829 | } | |
3830 | else | |
25289eb2 | 3831 | { |
4b60df3d PA |
3832 | /* See above. */ |
3833 | last_resume_kind = lp->last_resume_kind; | |
3834 | resume_clear_callback (lp, NULL); | |
25289eb2 | 3835 | } |
d6b0e80f | 3836 | |
26ab7092 | 3837 | if (linux_nat_status_is_event (status)) |
d6b0e80f | 3838 | { |
d6b0e80f AC |
3839 | if (debug_linux_nat) |
3840 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3841 | "LLW: trap ptid is %s.\n", |
3842 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3843 | } |
d6b0e80f AC |
3844 | |
3845 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3846 | { | |
3847 | *ourstatus = lp->waitstatus; | |
3848 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3849 | } | |
3850 | else | |
3851 | store_waitstatus (ourstatus, status); | |
3852 | ||
01124a23 | 3853 | if (debug_linux_nat) |
b84876c2 PA |
3854 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); |
3855 | ||
7feb7d06 | 3856 | restore_child_signals_mask (&prev_mask); |
1e225492 | 3857 | |
4b60df3d | 3858 | if (last_resume_kind == resume_stop |
25289eb2 PA |
3859 | && ourstatus->kind == TARGET_WAITKIND_STOPPED |
3860 | && WSTOPSIG (status) == SIGSTOP) | |
3861 | { | |
3862 | /* A thread that has been requested to stop by GDB with | |
3863 | target_stop, and it stopped cleanly, so report as SIG0. The | |
3864 | use of SIGSTOP is an implementation detail. */ | |
3865 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
3866 | } | |
3867 | ||
1e225492 JK |
3868 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
3869 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
3870 | lp->core = -1; | |
3871 | else | |
3872 | lp->core = linux_nat_core_of_thread_1 (lp->ptid); | |
3873 | ||
f973ed9c | 3874 | return lp->ptid; |
d6b0e80f AC |
3875 | } |
3876 | ||
e3e9f5a2 PA |
3877 | /* Resume LWPs that are currently stopped without any pending status |
3878 | to report, but are resumed from the core's perspective. */ | |
3879 | ||
3880 | static int | |
3881 | resume_stopped_resumed_lwps (struct lwp_info *lp, void *data) | |
3882 | { | |
3883 | ptid_t *wait_ptid_p = data; | |
3884 | ||
3885 | if (lp->stopped | |
3886 | && lp->resumed | |
3887 | && lp->status == 0 | |
3888 | && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) | |
3889 | { | |
3890 | gdb_assert (is_executing (lp->ptid)); | |
3891 | ||
3892 | /* Don't bother if there's a breakpoint at PC that we'd hit | |
3893 | immediately, and we're not waiting for this LWP. */ | |
3894 | if (!ptid_match (lp->ptid, *wait_ptid_p)) | |
3895 | { | |
3896 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
3897 | CORE_ADDR pc = regcache_read_pc (regcache); | |
3898 | ||
3899 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3900 | return 0; | |
3901 | } | |
3902 | ||
3903 | if (debug_linux_nat) | |
3904 | fprintf_unfiltered (gdb_stdlog, | |
3905 | "RSRL: resuming stopped-resumed LWP %s\n", | |
3906 | target_pid_to_str (lp->ptid)); | |
3907 | ||
3908 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
3909 | lp->step, TARGET_SIGNAL_0); | |
3910 | lp->stopped = 0; | |
3911 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
3912 | lp->stopped_by_watchpoint = 0; | |
3913 | } | |
3914 | ||
3915 | return 0; | |
3916 | } | |
3917 | ||
7feb7d06 PA |
3918 | static ptid_t |
3919 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3920 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3921 | int target_options) | |
7feb7d06 PA |
3922 | { |
3923 | ptid_t event_ptid; | |
3924 | ||
3925 | if (debug_linux_nat) | |
3e43a32a MS |
3926 | fprintf_unfiltered (gdb_stdlog, |
3927 | "linux_nat_wait: [%s]\n", target_pid_to_str (ptid)); | |
7feb7d06 PA |
3928 | |
3929 | /* Flush the async file first. */ | |
3930 | if (target_can_async_p ()) | |
3931 | async_file_flush (); | |
3932 | ||
e3e9f5a2 PA |
3933 | /* Resume LWPs that are currently stopped without any pending status |
3934 | to report, but are resumed from the core's perspective. LWPs get | |
3935 | in this state if we find them stopping at a time we're not | |
3936 | interested in reporting the event (target_wait on a | |
3937 | specific_process, for example, see linux_nat_wait_1), and | |
3938 | meanwhile the event became uninteresting. Don't bother resuming | |
3939 | LWPs we're not going to wait for if they'd stop immediately. */ | |
3940 | if (non_stop) | |
3941 | iterate_over_lwps (minus_one_ptid, resume_stopped_resumed_lwps, &ptid); | |
3942 | ||
47608cb1 | 3943 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3944 | |
3945 | /* If we requested any event, and something came out, assume there | |
3946 | may be more. If we requested a specific lwp or process, also | |
3947 | assume there may be more. */ | |
3948 | if (target_can_async_p () | |
3949 | && (ourstatus->kind != TARGET_WAITKIND_IGNORE | |
3950 | || !ptid_equal (ptid, minus_one_ptid))) | |
3951 | async_file_mark (); | |
3952 | ||
3953 | /* Get ready for the next event. */ | |
3954 | if (target_can_async_p ()) | |
3955 | target_async (inferior_event_handler, 0); | |
3956 | ||
3957 | return event_ptid; | |
3958 | } | |
3959 | ||
d6b0e80f AC |
3960 | static int |
3961 | kill_callback (struct lwp_info *lp, void *data) | |
3962 | { | |
ed731959 JK |
3963 | /* PTRACE_KILL may resume the inferior. Send SIGKILL first. */ |
3964 | ||
3965 | errno = 0; | |
3966 | kill (GET_LWP (lp->ptid), SIGKILL); | |
3967 | if (debug_linux_nat) | |
3968 | fprintf_unfiltered (gdb_stdlog, | |
3969 | "KC: kill (SIGKILL) %s, 0, 0 (%s)\n", | |
3970 | target_pid_to_str (lp->ptid), | |
3971 | errno ? safe_strerror (errno) : "OK"); | |
3972 | ||
3973 | /* Some kernels ignore even SIGKILL for processes under ptrace. */ | |
3974 | ||
d6b0e80f AC |
3975 | errno = 0; |
3976 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
3977 | if (debug_linux_nat) | |
3978 | fprintf_unfiltered (gdb_stdlog, | |
3979 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
3980 | target_pid_to_str (lp->ptid), | |
3981 | errno ? safe_strerror (errno) : "OK"); | |
3982 | ||
3983 | return 0; | |
3984 | } | |
3985 | ||
3986 | static int | |
3987 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3988 | { | |
3989 | pid_t pid; | |
3990 | ||
3991 | /* We must make sure that there are no pending events (delayed | |
3992 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3993 | program doesn't interfere with any following debugging session. */ | |
3994 | ||
3995 | /* For cloned processes we must check both with __WCLONE and | |
3996 | without, since the exit status of a cloned process isn't reported | |
3997 | with __WCLONE. */ | |
3998 | if (lp->cloned) | |
3999 | { | |
4000 | do | |
4001 | { | |
58aecb61 | 4002 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 4003 | if (pid != (pid_t) -1) |
d6b0e80f | 4004 | { |
e85a822c DJ |
4005 | if (debug_linux_nat) |
4006 | fprintf_unfiltered (gdb_stdlog, | |
4007 | "KWC: wait %s received unknown.\n", | |
4008 | target_pid_to_str (lp->ptid)); | |
4009 | /* The Linux kernel sometimes fails to kill a thread | |
4010 | completely after PTRACE_KILL; that goes from the stop | |
4011 | point in do_fork out to the one in | |
4012 | get_signal_to_deliever and waits again. So kill it | |
4013 | again. */ | |
4014 | kill_callback (lp, NULL); | |
d6b0e80f AC |
4015 | } |
4016 | } | |
4017 | while (pid == GET_LWP (lp->ptid)); | |
4018 | ||
4019 | gdb_assert (pid == -1 && errno == ECHILD); | |
4020 | } | |
4021 | ||
4022 | do | |
4023 | { | |
58aecb61 | 4024 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 4025 | if (pid != (pid_t) -1) |
d6b0e80f | 4026 | { |
e85a822c DJ |
4027 | if (debug_linux_nat) |
4028 | fprintf_unfiltered (gdb_stdlog, | |
4029 | "KWC: wait %s received unk.\n", | |
4030 | target_pid_to_str (lp->ptid)); | |
4031 | /* See the call to kill_callback above. */ | |
4032 | kill_callback (lp, NULL); | |
d6b0e80f AC |
4033 | } |
4034 | } | |
4035 | while (pid == GET_LWP (lp->ptid)); | |
4036 | ||
4037 | gdb_assert (pid == -1 && errno == ECHILD); | |
4038 | return 0; | |
4039 | } | |
4040 | ||
4041 | static void | |
7d85a9c0 | 4042 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 4043 | { |
f973ed9c DJ |
4044 | struct target_waitstatus last; |
4045 | ptid_t last_ptid; | |
4046 | int status; | |
d6b0e80f | 4047 | |
f973ed9c DJ |
4048 | /* If we're stopped while forking and we haven't followed yet, |
4049 | kill the other task. We need to do this first because the | |
4050 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 4051 | |
f973ed9c | 4052 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 4053 | |
f973ed9c DJ |
4054 | if (last.kind == TARGET_WAITKIND_FORKED |
4055 | || last.kind == TARGET_WAITKIND_VFORKED) | |
4056 | { | |
3a3e9ee3 | 4057 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
4058 | wait (&status); |
4059 | } | |
4060 | ||
4061 | if (forks_exist_p ()) | |
7feb7d06 | 4062 | linux_fork_killall (); |
f973ed9c DJ |
4063 | else |
4064 | { | |
d90e17a7 | 4065 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
e0881a8e | 4066 | |
4c28f408 PA |
4067 | /* Stop all threads before killing them, since ptrace requires |
4068 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 4069 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
4070 | /* ... and wait until all of them have reported back that |
4071 | they're no longer running. */ | |
d90e17a7 | 4072 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 4073 | |
f973ed9c | 4074 | /* Kill all LWP's ... */ |
d90e17a7 | 4075 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
4076 | |
4077 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 4078 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
4079 | } |
4080 | ||
4081 | target_mourn_inferior (); | |
d6b0e80f AC |
4082 | } |
4083 | ||
4084 | static void | |
136d6dae | 4085 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 4086 | { |
d90e17a7 | 4087 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
d6b0e80f | 4088 | |
f973ed9c | 4089 | if (! forks_exist_p ()) |
d90e17a7 PA |
4090 | /* Normal case, no other forks available. */ |
4091 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
4092 | else |
4093 | /* Multi-fork case. The current inferior_ptid has exited, but | |
4094 | there are other viable forks to debug. Delete the exiting | |
4095 | one and context-switch to the first available. */ | |
4096 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
4097 | } |
4098 | ||
5b009018 PA |
4099 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4100 | layout of the inferiors' architecture. */ | |
4101 | ||
4102 | static void | |
4103 | siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction) | |
4104 | { | |
4105 | int done = 0; | |
4106 | ||
4107 | if (linux_nat_siginfo_fixup != NULL) | |
4108 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
4109 | ||
4110 | /* If there was no callback, or the callback didn't do anything, | |
4111 | then just do a straight memcpy. */ | |
4112 | if (!done) | |
4113 | { | |
4114 | if (direction == 1) | |
4115 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
4116 | else | |
4117 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
4118 | } | |
4119 | } | |
4120 | ||
4aa995e1 PA |
4121 | static LONGEST |
4122 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, | |
4123 | const char *annex, gdb_byte *readbuf, | |
4124 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4125 | { | |
4aa995e1 PA |
4126 | int pid; |
4127 | struct siginfo siginfo; | |
5b009018 | 4128 | gdb_byte inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
4129 | |
4130 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
4131 | gdb_assert (readbuf || writebuf); | |
4132 | ||
4133 | pid = GET_LWP (inferior_ptid); | |
4134 | if (pid == 0) | |
4135 | pid = GET_PID (inferior_ptid); | |
4136 | ||
4137 | if (offset > sizeof (siginfo)) | |
4138 | return -1; | |
4139 | ||
4140 | errno = 0; | |
4141 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
4142 | if (errno != 0) | |
4143 | return -1; | |
4144 | ||
5b009018 PA |
4145 | /* When GDB is built as a 64-bit application, ptrace writes into |
4146 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4147 | inferior with a 64-bit GDB should look the same as debugging it | |
4148 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
4149 | the converted layout, so any read/write will have to be done | |
4150 | post-conversion. */ | |
4151 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4152 | ||
4aa995e1 PA |
4153 | if (offset + len > sizeof (siginfo)) |
4154 | len = sizeof (siginfo) - offset; | |
4155 | ||
4156 | if (readbuf != NULL) | |
5b009018 | 4157 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4158 | else |
4159 | { | |
5b009018 PA |
4160 | memcpy (inf_siginfo + offset, writebuf, len); |
4161 | ||
4162 | /* Convert back to ptrace layout before flushing it out. */ | |
4163 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4164 | ||
4aa995e1 PA |
4165 | errno = 0; |
4166 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
4167 | if (errno != 0) | |
4168 | return -1; | |
4169 | } | |
4170 | ||
4171 | return len; | |
4172 | } | |
4173 | ||
10d6c8cd DJ |
4174 | static LONGEST |
4175 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
4176 | const char *annex, gdb_byte *readbuf, | |
4177 | const gdb_byte *writebuf, | |
4178 | ULONGEST offset, LONGEST len) | |
d6b0e80f | 4179 | { |
4aa995e1 | 4180 | struct cleanup *old_chain; |
10d6c8cd | 4181 | LONGEST xfer; |
d6b0e80f | 4182 | |
4aa995e1 PA |
4183 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
4184 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
4185 | offset, len); | |
4186 | ||
c35b1492 PA |
4187 | /* The target is connected but no live inferior is selected. Pass |
4188 | this request down to a lower stratum (e.g., the executable | |
4189 | file). */ | |
4190 | if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid)) | |
4191 | return 0; | |
4192 | ||
4aa995e1 PA |
4193 | old_chain = save_inferior_ptid (); |
4194 | ||
d6b0e80f AC |
4195 | if (is_lwp (inferior_ptid)) |
4196 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
4197 | ||
10d6c8cd DJ |
4198 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
4199 | offset, len); | |
d6b0e80f AC |
4200 | |
4201 | do_cleanups (old_chain); | |
4202 | return xfer; | |
4203 | } | |
4204 | ||
4205 | static int | |
28439f5e | 4206 | linux_thread_alive (ptid_t ptid) |
d6b0e80f | 4207 | { |
8c6a60d1 | 4208 | int err, tmp_errno; |
4c28f408 | 4209 | |
d6b0e80f AC |
4210 | gdb_assert (is_lwp (ptid)); |
4211 | ||
4c28f408 PA |
4212 | /* Send signal 0 instead of anything ptrace, because ptracing a |
4213 | running thread errors out claiming that the thread doesn't | |
4214 | exist. */ | |
4215 | err = kill_lwp (GET_LWP (ptid), 0); | |
8c6a60d1 | 4216 | tmp_errno = errno; |
d6b0e80f AC |
4217 | if (debug_linux_nat) |
4218 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 4219 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 4220 | target_pid_to_str (ptid), |
8c6a60d1 | 4221 | err ? safe_strerror (tmp_errno) : "OK"); |
9c0dd46b | 4222 | |
4c28f408 | 4223 | if (err != 0) |
d6b0e80f AC |
4224 | return 0; |
4225 | ||
4226 | return 1; | |
4227 | } | |
4228 | ||
28439f5e PA |
4229 | static int |
4230 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
4231 | { | |
4232 | return linux_thread_alive (ptid); | |
4233 | } | |
4234 | ||
d6b0e80f | 4235 | static char * |
117de6a9 | 4236 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
4237 | { |
4238 | static char buf[64]; | |
4239 | ||
a0ef4274 | 4240 | if (is_lwp (ptid) |
d90e17a7 PA |
4241 | && (GET_PID (ptid) != GET_LWP (ptid) |
4242 | || num_lwps (GET_PID (ptid)) > 1)) | |
d6b0e80f AC |
4243 | { |
4244 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
4245 | return buf; | |
4246 | } | |
4247 | ||
4248 | return normal_pid_to_str (ptid); | |
4249 | } | |
4250 | ||
4694da01 TT |
4251 | static char * |
4252 | linux_nat_thread_name (struct thread_info *thr) | |
4253 | { | |
4254 | int pid = ptid_get_pid (thr->ptid); | |
4255 | long lwp = ptid_get_lwp (thr->ptid); | |
4256 | #define FORMAT "/proc/%d/task/%ld/comm" | |
4257 | char buf[sizeof (FORMAT) + 30]; | |
4258 | FILE *comm_file; | |
4259 | char *result = NULL; | |
4260 | ||
4261 | snprintf (buf, sizeof (buf), FORMAT, pid, lwp); | |
4262 | comm_file = fopen (buf, "r"); | |
4263 | if (comm_file) | |
4264 | { | |
4265 | /* Not exported by the kernel, so we define it here. */ | |
4266 | #define COMM_LEN 16 | |
4267 | static char line[COMM_LEN + 1]; | |
4268 | ||
4269 | if (fgets (line, sizeof (line), comm_file)) | |
4270 | { | |
4271 | char *nl = strchr (line, '\n'); | |
4272 | ||
4273 | if (nl) | |
4274 | *nl = '\0'; | |
4275 | if (*line != '\0') | |
4276 | result = line; | |
4277 | } | |
4278 | ||
4279 | fclose (comm_file); | |
4280 | } | |
4281 | ||
4282 | #undef COMM_LEN | |
4283 | #undef FORMAT | |
4284 | ||
4285 | return result; | |
4286 | } | |
4287 | ||
dba24537 AC |
4288 | /* Accepts an integer PID; Returns a string representing a file that |
4289 | can be opened to get the symbols for the child process. */ | |
4290 | ||
6d8fd2b7 UW |
4291 | static char * |
4292 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
4293 | { |
4294 | char *name1, *name2; | |
4295 | ||
4296 | name1 = xmalloc (MAXPATHLEN); | |
4297 | name2 = xmalloc (MAXPATHLEN); | |
4298 | make_cleanup (xfree, name1); | |
4299 | make_cleanup (xfree, name2); | |
4300 | memset (name2, 0, MAXPATHLEN); | |
4301 | ||
4302 | sprintf (name1, "/proc/%d/exe", pid); | |
4303 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
4304 | return name2; | |
4305 | else | |
4306 | return name1; | |
4307 | } | |
4308 | ||
4309 | /* Service function for corefiles and info proc. */ | |
4310 | ||
4311 | static int | |
4312 | read_mapping (FILE *mapfile, | |
4313 | long long *addr, | |
4314 | long long *endaddr, | |
4315 | char *permissions, | |
4316 | long long *offset, | |
4317 | char *device, long long *inode, char *filename) | |
4318 | { | |
4319 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
4320 | addr, endaddr, permissions, offset, device, inode); | |
4321 | ||
2e14c2ea MS |
4322 | filename[0] = '\0'; |
4323 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
4324 | { |
4325 | /* Eat everything up to EOL for the filename. This will prevent | |
4326 | weird filenames (such as one with embedded whitespace) from | |
4327 | confusing this code. It also makes this code more robust in | |
4328 | respect to annotations the kernel may add after the filename. | |
4329 | ||
4330 | Note the filename is used for informational purposes | |
4331 | only. */ | |
4332 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
4333 | } | |
2e14c2ea | 4334 | |
dba24537 AC |
4335 | return (ret != 0 && ret != EOF); |
4336 | } | |
4337 | ||
4338 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
4339 | regions in the inferior for a corefile. */ | |
4340 | ||
4341 | static int | |
b8edc417 | 4342 | linux_nat_find_memory_regions (find_memory_region_ftype func, void *obfd) |
dba24537 | 4343 | { |
89ecc4f5 | 4344 | int pid = PIDGET (inferior_ptid); |
dba24537 AC |
4345 | char mapsfilename[MAXPATHLEN]; |
4346 | FILE *mapsfile; | |
4347 | long long addr, endaddr, size, offset, inode; | |
4348 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
4349 | int read, write, exec; | |
7c8a8b04 | 4350 | struct cleanup *cleanup; |
dba24537 AC |
4351 | |
4352 | /* Compose the filename for the /proc memory map, and open it. */ | |
89ecc4f5 | 4353 | sprintf (mapsfilename, "/proc/%d/maps", pid); |
dba24537 | 4354 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) |
8a3fe4f8 | 4355 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 4356 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
4357 | |
4358 | if (info_verbose) | |
4359 | fprintf_filtered (gdb_stdout, | |
4360 | "Reading memory regions from %s\n", mapsfilename); | |
4361 | ||
4362 | /* Now iterate until end-of-file. */ | |
4363 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
4364 | &offset, &device[0], &inode, &filename[0])) | |
4365 | { | |
4366 | size = endaddr - addr; | |
4367 | ||
4368 | /* Get the segment's permissions. */ | |
4369 | read = (strchr (permissions, 'r') != 0); | |
4370 | write = (strchr (permissions, 'w') != 0); | |
4371 | exec = (strchr (permissions, 'x') != 0); | |
4372 | ||
4373 | if (info_verbose) | |
4374 | { | |
4375 | fprintf_filtered (gdb_stdout, | |
2244ba2e PM |
4376 | "Save segment, %s bytes at %s (%c%c%c)", |
4377 | plongest (size), paddress (target_gdbarch, addr), | |
dba24537 AC |
4378 | read ? 'r' : ' ', |
4379 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 4380 | if (filename[0]) |
dba24537 AC |
4381 | fprintf_filtered (gdb_stdout, " for %s", filename); |
4382 | fprintf_filtered (gdb_stdout, "\n"); | |
4383 | } | |
4384 | ||
4385 | /* Invoke the callback function to create the corefile | |
4386 | segment. */ | |
4387 | func (addr, size, read, write, exec, obfd); | |
4388 | } | |
7c8a8b04 | 4389 | do_cleanups (cleanup); |
dba24537 AC |
4390 | return 0; |
4391 | } | |
4392 | ||
2020b7ab PA |
4393 | static int |
4394 | find_signalled_thread (struct thread_info *info, void *data) | |
4395 | { | |
16c381f0 | 4396 | if (info->suspend.stop_signal != TARGET_SIGNAL_0 |
2020b7ab PA |
4397 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) |
4398 | return 1; | |
4399 | ||
4400 | return 0; | |
4401 | } | |
4402 | ||
4403 | static enum target_signal | |
4404 | find_stop_signal (void) | |
4405 | { | |
4406 | struct thread_info *info = | |
4407 | iterate_over_threads (find_signalled_thread, NULL); | |
4408 | ||
4409 | if (info) | |
16c381f0 | 4410 | return info->suspend.stop_signal; |
2020b7ab PA |
4411 | else |
4412 | return TARGET_SIGNAL_0; | |
4413 | } | |
4414 | ||
dba24537 AC |
4415 | /* Records the thread's register state for the corefile note |
4416 | section. */ | |
4417 | ||
4418 | static char * | |
4419 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
4420 | char *note_data, int *note_size, |
4421 | enum target_signal stop_signal) | |
dba24537 | 4422 | { |
dba24537 | 4423 | unsigned long lwp = ptid_get_lwp (ptid); |
c2250ad1 UW |
4424 | struct gdbarch *gdbarch = target_gdbarch; |
4425 | struct regcache *regcache = get_thread_arch_regcache (ptid, gdbarch); | |
4f844a66 | 4426 | const struct regset *regset; |
55e969c1 | 4427 | int core_regset_p; |
594f7785 | 4428 | struct cleanup *old_chain; |
17ea7499 CES |
4429 | struct core_regset_section *sect_list; |
4430 | char *gdb_regset; | |
594f7785 UW |
4431 | |
4432 | old_chain = save_inferior_ptid (); | |
4433 | inferior_ptid = ptid; | |
4434 | target_fetch_registers (regcache, -1); | |
4435 | do_cleanups (old_chain); | |
4f844a66 DM |
4436 | |
4437 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
4438 | sect_list = gdbarch_core_regset_sections (gdbarch); |
4439 | ||
17ea7499 CES |
4440 | /* The loop below uses the new struct core_regset_section, which stores |
4441 | the supported section names and sizes for the core file. Note that | |
4442 | note PRSTATUS needs to be treated specially. But the other notes are | |
4443 | structurally the same, so they can benefit from the new struct. */ | |
4444 | if (core_regset_p && sect_list != NULL) | |
4445 | while (sect_list->sect_name != NULL) | |
4446 | { | |
17ea7499 CES |
4447 | regset = gdbarch_regset_from_core_section (gdbarch, |
4448 | sect_list->sect_name, | |
4449 | sect_list->size); | |
4450 | gdb_assert (regset && regset->collect_regset); | |
4451 | gdb_regset = xmalloc (sect_list->size); | |
4452 | regset->collect_regset (regset, regcache, -1, | |
4453 | gdb_regset, sect_list->size); | |
2f2241f1 UW |
4454 | |
4455 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
4456 | note_data = (char *) elfcore_write_prstatus | |
4457 | (obfd, note_data, note_size, | |
857d11d0 JK |
4458 | lwp, target_signal_to_host (stop_signal), |
4459 | gdb_regset); | |
2f2241f1 UW |
4460 | else |
4461 | note_data = (char *) elfcore_write_register_note | |
4462 | (obfd, note_data, note_size, | |
4463 | sect_list->sect_name, gdb_regset, | |
4464 | sect_list->size); | |
17ea7499 CES |
4465 | xfree (gdb_regset); |
4466 | sect_list++; | |
4467 | } | |
dba24537 | 4468 | |
17ea7499 CES |
4469 | /* For architectures that does not have the struct core_regset_section |
4470 | implemented, we use the old method. When all the architectures have | |
4471 | the new support, the code below should be deleted. */ | |
4f844a66 | 4472 | else |
17ea7499 | 4473 | { |
2f2241f1 UW |
4474 | gdb_gregset_t gregs; |
4475 | gdb_fpregset_t fpregs; | |
4476 | ||
4477 | if (core_regset_p | |
4478 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
3e43a32a MS |
4479 | sizeof (gregs))) |
4480 | != NULL && regset->collect_regset != NULL) | |
2f2241f1 UW |
4481 | regset->collect_regset (regset, regcache, -1, |
4482 | &gregs, sizeof (gregs)); | |
4483 | else | |
4484 | fill_gregset (regcache, &gregs, -1); | |
4485 | ||
857d11d0 JK |
4486 | note_data = (char *) elfcore_write_prstatus |
4487 | (obfd, note_data, note_size, lwp, target_signal_to_host (stop_signal), | |
4488 | &gregs); | |
2f2241f1 | 4489 | |
17ea7499 CES |
4490 | if (core_regset_p |
4491 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
3e43a32a MS |
4492 | sizeof (fpregs))) |
4493 | != NULL && regset->collect_regset != NULL) | |
17ea7499 CES |
4494 | regset->collect_regset (regset, regcache, -1, |
4495 | &fpregs, sizeof (fpregs)); | |
4496 | else | |
4497 | fill_fpregset (regcache, &fpregs, -1); | |
4498 | ||
4499 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
4500 | note_data, | |
4501 | note_size, | |
4502 | &fpregs, sizeof (fpregs)); | |
4503 | } | |
4f844a66 | 4504 | |
dba24537 AC |
4505 | return note_data; |
4506 | } | |
4507 | ||
4508 | struct linux_nat_corefile_thread_data | |
4509 | { | |
4510 | bfd *obfd; | |
4511 | char *note_data; | |
4512 | int *note_size; | |
4513 | int num_notes; | |
2020b7ab | 4514 | enum target_signal stop_signal; |
dba24537 AC |
4515 | }; |
4516 | ||
4517 | /* Called by gdbthread.c once per thread. Records the thread's | |
4518 | register state for the corefile note section. */ | |
4519 | ||
4520 | static int | |
4521 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
4522 | { | |
4523 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 4524 | |
dba24537 AC |
4525 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
4526 | ti->ptid, | |
4527 | args->note_data, | |
2020b7ab PA |
4528 | args->note_size, |
4529 | args->stop_signal); | |
dba24537 | 4530 | args->num_notes++; |
56be3814 | 4531 | |
dba24537 AC |
4532 | return 0; |
4533 | } | |
4534 | ||
efcbbd14 UW |
4535 | /* Enumerate spufs IDs for process PID. */ |
4536 | ||
4537 | static void | |
4538 | iterate_over_spus (int pid, void (*callback) (void *, int), void *data) | |
4539 | { | |
4540 | char path[128]; | |
4541 | DIR *dir; | |
4542 | struct dirent *entry; | |
4543 | ||
4544 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4545 | dir = opendir (path); | |
4546 | if (!dir) | |
4547 | return; | |
4548 | ||
4549 | rewinddir (dir); | |
4550 | while ((entry = readdir (dir)) != NULL) | |
4551 | { | |
4552 | struct stat st; | |
4553 | struct statfs stfs; | |
4554 | int fd; | |
4555 | ||
4556 | fd = atoi (entry->d_name); | |
4557 | if (!fd) | |
4558 | continue; | |
4559 | ||
4560 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4561 | if (stat (path, &st) != 0) | |
4562 | continue; | |
4563 | if (!S_ISDIR (st.st_mode)) | |
4564 | continue; | |
4565 | ||
4566 | if (statfs (path, &stfs) != 0) | |
4567 | continue; | |
4568 | if (stfs.f_type != SPUFS_MAGIC) | |
4569 | continue; | |
4570 | ||
4571 | callback (data, fd); | |
4572 | } | |
4573 | ||
4574 | closedir (dir); | |
4575 | } | |
4576 | ||
4577 | /* Generate corefile notes for SPU contexts. */ | |
4578 | ||
4579 | struct linux_spu_corefile_data | |
4580 | { | |
4581 | bfd *obfd; | |
4582 | char *note_data; | |
4583 | int *note_size; | |
4584 | }; | |
4585 | ||
4586 | static void | |
4587 | linux_spu_corefile_callback (void *data, int fd) | |
4588 | { | |
4589 | struct linux_spu_corefile_data *args = data; | |
4590 | int i; | |
4591 | ||
4592 | static const char *spu_files[] = | |
4593 | { | |
4594 | "object-id", | |
4595 | "mem", | |
4596 | "regs", | |
4597 | "fpcr", | |
4598 | "lslr", | |
4599 | "decr", | |
4600 | "decr_status", | |
4601 | "signal1", | |
4602 | "signal1_type", | |
4603 | "signal2", | |
4604 | "signal2_type", | |
4605 | "event_mask", | |
4606 | "event_status", | |
4607 | "mbox_info", | |
4608 | "ibox_info", | |
4609 | "wbox_info", | |
4610 | "dma_info", | |
4611 | "proxydma_info", | |
4612 | }; | |
4613 | ||
4614 | for (i = 0; i < sizeof (spu_files) / sizeof (spu_files[0]); i++) | |
4615 | { | |
4616 | char annex[32], note_name[32]; | |
4617 | gdb_byte *spu_data; | |
4618 | LONGEST spu_len; | |
4619 | ||
4620 | xsnprintf (annex, sizeof annex, "%d/%s", fd, spu_files[i]); | |
4621 | spu_len = target_read_alloc (¤t_target, TARGET_OBJECT_SPU, | |
4622 | annex, &spu_data); | |
4623 | if (spu_len > 0) | |
4624 | { | |
4625 | xsnprintf (note_name, sizeof note_name, "SPU/%s", annex); | |
4626 | args->note_data = elfcore_write_note (args->obfd, args->note_data, | |
4627 | args->note_size, note_name, | |
4628 | NT_SPU, spu_data, spu_len); | |
4629 | xfree (spu_data); | |
4630 | } | |
4631 | } | |
4632 | } | |
4633 | ||
4634 | static char * | |
4635 | linux_spu_make_corefile_notes (bfd *obfd, char *note_data, int *note_size) | |
4636 | { | |
4637 | struct linux_spu_corefile_data args; | |
e0881a8e | 4638 | |
efcbbd14 UW |
4639 | args.obfd = obfd; |
4640 | args.note_data = note_data; | |
4641 | args.note_size = note_size; | |
4642 | ||
4643 | iterate_over_spus (PIDGET (inferior_ptid), | |
4644 | linux_spu_corefile_callback, &args); | |
4645 | ||
4646 | return args.note_data; | |
4647 | } | |
4648 | ||
dba24537 AC |
4649 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
4650 | section for a corefile, and returns it in a malloc buffer. */ | |
4651 | ||
4652 | static char * | |
4653 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
4654 | { | |
4655 | struct linux_nat_corefile_thread_data thread_args; | |
d99148ef | 4656 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 4657 | char fname[16] = { '\0' }; |
d99148ef | 4658 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
4659 | char psargs[80] = { '\0' }; |
4660 | char *note_data = NULL; | |
d90e17a7 | 4661 | ptid_t filter = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
c6826062 | 4662 | gdb_byte *auxv; |
dba24537 AC |
4663 | int auxv_len; |
4664 | ||
4665 | if (get_exec_file (0)) | |
4666 | { | |
9f37bbcc | 4667 | strncpy (fname, lbasename (get_exec_file (0)), sizeof (fname)); |
dba24537 AC |
4668 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); |
4669 | if (get_inferior_args ()) | |
4670 | { | |
d99148ef JK |
4671 | char *string_end; |
4672 | char *psargs_end = psargs + sizeof (psargs); | |
4673 | ||
4674 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
4675 | strings fine. */ | |
4676 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
4677 | if (string_end != NULL) | |
4678 | { | |
4679 | *string_end++ = ' '; | |
4680 | strncpy (string_end, get_inferior_args (), | |
4681 | psargs_end - string_end); | |
4682 | } | |
dba24537 AC |
4683 | } |
4684 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
4685 | note_data, | |
4686 | note_size, fname, psargs); | |
4687 | } | |
4688 | ||
4689 | /* Dump information for threads. */ | |
4690 | thread_args.obfd = obfd; | |
4691 | thread_args.note_data = note_data; | |
4692 | thread_args.note_size = note_size; | |
4693 | thread_args.num_notes = 0; | |
2020b7ab | 4694 | thread_args.stop_signal = find_stop_signal (); |
d90e17a7 | 4695 | iterate_over_lwps (filter, linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
4696 | gdb_assert (thread_args.num_notes != 0); |
4697 | note_data = thread_args.note_data; | |
dba24537 | 4698 | |
13547ab6 DJ |
4699 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
4700 | NULL, &auxv); | |
dba24537 AC |
4701 | if (auxv_len > 0) |
4702 | { | |
4703 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
4704 | "CORE", NT_AUXV, auxv, auxv_len); | |
4705 | xfree (auxv); | |
4706 | } | |
4707 | ||
efcbbd14 UW |
4708 | note_data = linux_spu_make_corefile_notes (obfd, note_data, note_size); |
4709 | ||
dba24537 AC |
4710 | make_cleanup (xfree, note_data); |
4711 | return note_data; | |
4712 | } | |
4713 | ||
4714 | /* Implement the "info proc" command. */ | |
4715 | ||
4716 | static void | |
4717 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
4718 | { | |
89ecc4f5 DE |
4719 | /* A long is used for pid instead of an int to avoid a loss of precision |
4720 | compiler warning from the output of strtoul. */ | |
4721 | long pid = PIDGET (inferior_ptid); | |
dba24537 AC |
4722 | FILE *procfile; |
4723 | char **argv = NULL; | |
4724 | char buffer[MAXPATHLEN]; | |
4725 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
4726 | int cmdline_f = 1; | |
4727 | int cwd_f = 1; | |
4728 | int exe_f = 1; | |
4729 | int mappings_f = 0; | |
dba24537 AC |
4730 | int status_f = 0; |
4731 | int stat_f = 0; | |
4732 | int all = 0; | |
4733 | struct stat dummy; | |
4734 | ||
4735 | if (args) | |
4736 | { | |
4737 | /* Break up 'args' into an argv array. */ | |
d1a41061 PP |
4738 | argv = gdb_buildargv (args); |
4739 | make_cleanup_freeargv (argv); | |
dba24537 AC |
4740 | } |
4741 | while (argv != NULL && *argv != NULL) | |
4742 | { | |
4743 | if (isdigit (argv[0][0])) | |
4744 | { | |
4745 | pid = strtoul (argv[0], NULL, 10); | |
4746 | } | |
4747 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
4748 | { | |
4749 | mappings_f = 1; | |
4750 | } | |
4751 | else if (strcmp (argv[0], "status") == 0) | |
4752 | { | |
4753 | status_f = 1; | |
4754 | } | |
4755 | else if (strcmp (argv[0], "stat") == 0) | |
4756 | { | |
4757 | stat_f = 1; | |
4758 | } | |
4759 | else if (strcmp (argv[0], "cmd") == 0) | |
4760 | { | |
4761 | cmdline_f = 1; | |
4762 | } | |
4763 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
4764 | { | |
4765 | exe_f = 1; | |
4766 | } | |
4767 | else if (strcmp (argv[0], "cwd") == 0) | |
4768 | { | |
4769 | cwd_f = 1; | |
4770 | } | |
4771 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
4772 | { | |
4773 | all = 1; | |
4774 | } | |
4775 | else | |
4776 | { | |
1777feb0 | 4777 | /* [...] (future options here). */ |
dba24537 AC |
4778 | } |
4779 | argv++; | |
4780 | } | |
4781 | if (pid == 0) | |
8a3fe4f8 | 4782 | error (_("No current process: you must name one.")); |
dba24537 | 4783 | |
89ecc4f5 | 4784 | sprintf (fname1, "/proc/%ld", pid); |
dba24537 | 4785 | if (stat (fname1, &dummy) != 0) |
8a3fe4f8 | 4786 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 4787 | |
89ecc4f5 | 4788 | printf_filtered (_("process %ld\n"), pid); |
dba24537 AC |
4789 | if (cmdline_f || all) |
4790 | { | |
89ecc4f5 | 4791 | sprintf (fname1, "/proc/%ld/cmdline", pid); |
d5d6fca5 | 4792 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4793 | { |
7c8a8b04 | 4794 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
e0881a8e | 4795 | |
bf1d7d9c JB |
4796 | if (fgets (buffer, sizeof (buffer), procfile)) |
4797 | printf_filtered ("cmdline = '%s'\n", buffer); | |
4798 | else | |
4799 | warning (_("unable to read '%s'"), fname1); | |
7c8a8b04 | 4800 | do_cleanups (cleanup); |
dba24537 AC |
4801 | } |
4802 | else | |
8a3fe4f8 | 4803 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4804 | } |
4805 | if (cwd_f || all) | |
4806 | { | |
89ecc4f5 | 4807 | sprintf (fname1, "/proc/%ld/cwd", pid); |
dba24537 AC |
4808 | memset (fname2, 0, sizeof (fname2)); |
4809 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4810 | printf_filtered ("cwd = '%s'\n", fname2); | |
4811 | else | |
8a3fe4f8 | 4812 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4813 | } |
4814 | if (exe_f || all) | |
4815 | { | |
89ecc4f5 | 4816 | sprintf (fname1, "/proc/%ld/exe", pid); |
dba24537 AC |
4817 | memset (fname2, 0, sizeof (fname2)); |
4818 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4819 | printf_filtered ("exe = '%s'\n", fname2); | |
4820 | else | |
8a3fe4f8 | 4821 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4822 | } |
4823 | if (mappings_f || all) | |
4824 | { | |
89ecc4f5 | 4825 | sprintf (fname1, "/proc/%ld/maps", pid); |
d5d6fca5 | 4826 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4827 | { |
4828 | long long addr, endaddr, size, offset, inode; | |
4829 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 4830 | struct cleanup *cleanup; |
dba24537 | 4831 | |
7c8a8b04 | 4832 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 4833 | printf_filtered (_("Mapped address spaces:\n\n")); |
a97b0ac8 | 4834 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4835 | { |
4836 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
4837 | "Start Addr", | |
4838 | " End Addr", | |
4839 | " Size", " Offset", "objfile"); | |
4840 | } | |
4841 | else | |
4842 | { | |
4843 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
4844 | "Start Addr", | |
4845 | " End Addr", | |
4846 | " Size", " Offset", "objfile"); | |
4847 | } | |
4848 | ||
4849 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
4850 | &offset, &device[0], &inode, &filename[0])) | |
4851 | { | |
4852 | size = endaddr - addr; | |
4853 | ||
4854 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
4855 | calls here (and possibly above) should be abstracted | |
4856 | out into their own functions? Andrew suggests using | |
4857 | a generic local_address_string instead to print out | |
4858 | the addresses; that makes sense to me, too. */ | |
4859 | ||
a97b0ac8 | 4860 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4861 | { |
4862 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
4863 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4864 | (unsigned long) endaddr, | |
4865 | (int) size, | |
4866 | (unsigned int) offset, | |
4867 | filename[0] ? filename : ""); | |
4868 | } | |
4869 | else | |
4870 | { | |
4871 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
4872 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4873 | (unsigned long) endaddr, | |
4874 | (int) size, | |
4875 | (unsigned int) offset, | |
4876 | filename[0] ? filename : ""); | |
4877 | } | |
4878 | } | |
4879 | ||
7c8a8b04 | 4880 | do_cleanups (cleanup); |
dba24537 AC |
4881 | } |
4882 | else | |
8a3fe4f8 | 4883 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4884 | } |
4885 | if (status_f || all) | |
4886 | { | |
89ecc4f5 | 4887 | sprintf (fname1, "/proc/%ld/status", pid); |
d5d6fca5 | 4888 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4889 | { |
7c8a8b04 | 4890 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
e0881a8e | 4891 | |
dba24537 AC |
4892 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
4893 | puts_filtered (buffer); | |
7c8a8b04 | 4894 | do_cleanups (cleanup); |
dba24537 AC |
4895 | } |
4896 | else | |
8a3fe4f8 | 4897 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4898 | } |
4899 | if (stat_f || all) | |
4900 | { | |
89ecc4f5 | 4901 | sprintf (fname1, "/proc/%ld/stat", pid); |
d5d6fca5 | 4902 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4903 | { |
4904 | int itmp; | |
4905 | char ctmp; | |
a25694b4 | 4906 | long ltmp; |
7c8a8b04 | 4907 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4908 | |
4909 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 4910 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 4911 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 4912 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 4913 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 4914 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 4915 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4916 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 4917 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4918 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 4919 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4920 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 4921 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4922 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 4923 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4924 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
4925 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4926 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
4927 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4928 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
4929 | (unsigned long) ltmp); | |
4930 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4931 | printf_filtered (_("Minor faults, children: %lu\n"), | |
4932 | (unsigned long) ltmp); | |
4933 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4934 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
4935 | (unsigned long) ltmp); | |
4936 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4937 | printf_filtered (_("Major faults, children: %lu\n"), | |
4938 | (unsigned long) ltmp); | |
4939 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4940 | printf_filtered (_("utime: %ld\n"), ltmp); | |
4941 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4942 | printf_filtered (_("stime: %ld\n"), ltmp); | |
4943 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4944 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
4945 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4946 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
4947 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3e43a32a MS |
4948 | printf_filtered (_("jiffies remaining in current " |
4949 | "time slice: %ld\n"), ltmp); | |
a25694b4 AS |
4950 | if (fscanf (procfile, "%ld ", <mp) > 0) |
4951 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
4952 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4953 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
4954 | (unsigned long) ltmp); | |
4955 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4956 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
4957 | (unsigned long) ltmp); | |
4958 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3e43a32a MS |
4959 | printf_filtered (_("start time (jiffies since " |
4960 | "system boot): %ld\n"), ltmp); | |
a25694b4 AS |
4961 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4962 | printf_filtered (_("Virtual memory size: %lu\n"), | |
4963 | (unsigned long) ltmp); | |
4964 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3e43a32a MS |
4965 | printf_filtered (_("Resident set size: %lu\n"), |
4966 | (unsigned long) ltmp); | |
a25694b4 AS |
4967 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4968 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
4969 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4970 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
4971 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4972 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
4973 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4974 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
3e43a32a MS |
4975 | #if 0 /* Don't know how architecture-dependent the rest is... |
4976 | Anyway the signal bitmap info is available from "status". */ | |
1777feb0 | 4977 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 | 4978 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); |
1777feb0 | 4979 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 AS |
4980 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); |
4981 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4982 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
4983 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4984 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
4985 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4986 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
4987 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4988 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
1777feb0 | 4989 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 | 4990 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); |
dba24537 | 4991 | #endif |
7c8a8b04 | 4992 | do_cleanups (cleanup); |
dba24537 AC |
4993 | } |
4994 | else | |
8a3fe4f8 | 4995 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4996 | } |
4997 | } | |
4998 | ||
10d6c8cd DJ |
4999 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
5000 | filesystem. Because we can use a single read() call for /proc, this | |
5001 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
5002 | but it doesn't support writes. */ | |
5003 | ||
5004 | static LONGEST | |
5005 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
5006 | const char *annex, gdb_byte *readbuf, | |
5007 | const gdb_byte *writebuf, | |
5008 | ULONGEST offset, LONGEST len) | |
dba24537 | 5009 | { |
10d6c8cd DJ |
5010 | LONGEST ret; |
5011 | int fd; | |
dba24537 AC |
5012 | char filename[64]; |
5013 | ||
10d6c8cd | 5014 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
5015 | return 0; |
5016 | ||
5017 | /* Don't bother for one word. */ | |
5018 | if (len < 3 * sizeof (long)) | |
5019 | return 0; | |
5020 | ||
5021 | /* We could keep this file open and cache it - possibly one per | |
5022 | thread. That requires some juggling, but is even faster. */ | |
5023 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
5024 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
5025 | if (fd == -1) | |
5026 | return 0; | |
5027 | ||
5028 | /* If pread64 is available, use it. It's faster if the kernel | |
5029 | supports it (only one syscall), and it's 64-bit safe even on | |
5030 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5031 | application). */ | |
5032 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 5033 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 5034 | #else |
10d6c8cd | 5035 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
5036 | #endif |
5037 | ret = 0; | |
5038 | else | |
5039 | ret = len; | |
5040 | ||
5041 | close (fd); | |
5042 | return ret; | |
5043 | } | |
5044 | ||
efcbbd14 UW |
5045 | |
5046 | /* Enumerate spufs IDs for process PID. */ | |
5047 | static LONGEST | |
5048 | spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, LONGEST len) | |
5049 | { | |
5050 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
5051 | LONGEST pos = 0; | |
5052 | LONGEST written = 0; | |
5053 | char path[128]; | |
5054 | DIR *dir; | |
5055 | struct dirent *entry; | |
5056 | ||
5057 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
5058 | dir = opendir (path); | |
5059 | if (!dir) | |
5060 | return -1; | |
5061 | ||
5062 | rewinddir (dir); | |
5063 | while ((entry = readdir (dir)) != NULL) | |
5064 | { | |
5065 | struct stat st; | |
5066 | struct statfs stfs; | |
5067 | int fd; | |
5068 | ||
5069 | fd = atoi (entry->d_name); | |
5070 | if (!fd) | |
5071 | continue; | |
5072 | ||
5073 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
5074 | if (stat (path, &st) != 0) | |
5075 | continue; | |
5076 | if (!S_ISDIR (st.st_mode)) | |
5077 | continue; | |
5078 | ||
5079 | if (statfs (path, &stfs) != 0) | |
5080 | continue; | |
5081 | if (stfs.f_type != SPUFS_MAGIC) | |
5082 | continue; | |
5083 | ||
5084 | if (pos >= offset && pos + 4 <= offset + len) | |
5085 | { | |
5086 | store_unsigned_integer (buf + pos - offset, 4, byte_order, fd); | |
5087 | written += 4; | |
5088 | } | |
5089 | pos += 4; | |
5090 | } | |
5091 | ||
5092 | closedir (dir); | |
5093 | return written; | |
5094 | } | |
5095 | ||
5096 | /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5097 | object type, using the /proc file system. */ | |
5098 | static LONGEST | |
5099 | linux_proc_xfer_spu (struct target_ops *ops, enum target_object object, | |
5100 | const char *annex, gdb_byte *readbuf, | |
5101 | const gdb_byte *writebuf, | |
5102 | ULONGEST offset, LONGEST len) | |
5103 | { | |
5104 | char buf[128]; | |
5105 | int fd = 0; | |
5106 | int ret = -1; | |
5107 | int pid = PIDGET (inferior_ptid); | |
5108 | ||
5109 | if (!annex) | |
5110 | { | |
5111 | if (!readbuf) | |
5112 | return -1; | |
5113 | else | |
5114 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5115 | } | |
5116 | ||
5117 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
5118 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5119 | if (fd <= 0) | |
5120 | return -1; | |
5121 | ||
5122 | if (offset != 0 | |
5123 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5124 | { | |
5125 | close (fd); | |
5126 | return 0; | |
5127 | } | |
5128 | ||
5129 | if (writebuf) | |
5130 | ret = write (fd, writebuf, (size_t) len); | |
5131 | else if (readbuf) | |
5132 | ret = read (fd, readbuf, (size_t) len); | |
5133 | ||
5134 | close (fd); | |
5135 | return ret; | |
5136 | } | |
5137 | ||
5138 | ||
dba24537 AC |
5139 | /* Parse LINE as a signal set and add its set bits to SIGS. */ |
5140 | ||
5141 | static void | |
5142 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
5143 | { | |
5144 | int len = strlen (line) - 1; | |
5145 | const char *p; | |
5146 | int signum; | |
5147 | ||
5148 | if (line[len] != '\n') | |
8a3fe4f8 | 5149 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
5150 | |
5151 | p = line; | |
5152 | signum = len * 4; | |
5153 | while (len-- > 0) | |
5154 | { | |
5155 | int digit; | |
5156 | ||
5157 | if (*p >= '0' && *p <= '9') | |
5158 | digit = *p - '0'; | |
5159 | else if (*p >= 'a' && *p <= 'f') | |
5160 | digit = *p - 'a' + 10; | |
5161 | else | |
8a3fe4f8 | 5162 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
5163 | |
5164 | signum -= 4; | |
5165 | ||
5166 | if (digit & 1) | |
5167 | sigaddset (sigs, signum + 1); | |
5168 | if (digit & 2) | |
5169 | sigaddset (sigs, signum + 2); | |
5170 | if (digit & 4) | |
5171 | sigaddset (sigs, signum + 3); | |
5172 | if (digit & 8) | |
5173 | sigaddset (sigs, signum + 4); | |
5174 | ||
5175 | p++; | |
5176 | } | |
5177 | } | |
5178 | ||
5179 | /* Find process PID's pending signals from /proc/pid/status and set | |
5180 | SIGS to match. */ | |
5181 | ||
5182 | void | |
3e43a32a MS |
5183 | linux_proc_pending_signals (int pid, sigset_t *pending, |
5184 | sigset_t *blocked, sigset_t *ignored) | |
dba24537 AC |
5185 | { |
5186 | FILE *procfile; | |
5187 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
7c8a8b04 | 5188 | struct cleanup *cleanup; |
dba24537 AC |
5189 | |
5190 | sigemptyset (pending); | |
5191 | sigemptyset (blocked); | |
5192 | sigemptyset (ignored); | |
5193 | sprintf (fname, "/proc/%d/status", pid); | |
5194 | procfile = fopen (fname, "r"); | |
5195 | if (procfile == NULL) | |
8a3fe4f8 | 5196 | error (_("Could not open %s"), fname); |
7c8a8b04 | 5197 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
5198 | |
5199 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
5200 | { | |
5201 | /* Normal queued signals are on the SigPnd line in the status | |
5202 | file. However, 2.6 kernels also have a "shared" pending | |
5203 | queue for delivering signals to a thread group, so check for | |
5204 | a ShdPnd line also. | |
5205 | ||
5206 | Unfortunately some Red Hat kernels include the shared pending | |
5207 | queue but not the ShdPnd status field. */ | |
5208 | ||
5209 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
5210 | add_line_to_sigset (buffer + 8, pending); | |
5211 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
5212 | add_line_to_sigset (buffer + 8, pending); | |
5213 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
5214 | add_line_to_sigset (buffer + 8, blocked); | |
5215 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
5216 | add_line_to_sigset (buffer + 8, ignored); | |
5217 | } | |
5218 | ||
7c8a8b04 | 5219 | do_cleanups (cleanup); |
dba24537 AC |
5220 | } |
5221 | ||
07e059b5 VP |
5222 | static LONGEST |
5223 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
e0881a8e MS |
5224 | const char *annex, gdb_byte *readbuf, |
5225 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
07e059b5 | 5226 | { |
07e059b5 VP |
5227 | gdb_assert (object == TARGET_OBJECT_OSDATA); |
5228 | ||
d26e3629 | 5229 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5230 | } |
5231 | ||
10d6c8cd DJ |
5232 | static LONGEST |
5233 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
5234 | const char *annex, gdb_byte *readbuf, | |
5235 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
5236 | { | |
5237 | LONGEST xfer; | |
5238 | ||
5239 | if (object == TARGET_OBJECT_AUXV) | |
9f2982ff | 5240 | return memory_xfer_auxv (ops, object, annex, readbuf, writebuf, |
10d6c8cd DJ |
5241 | offset, len); |
5242 | ||
07e059b5 VP |
5243 | if (object == TARGET_OBJECT_OSDATA) |
5244 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
5245 | offset, len); | |
5246 | ||
efcbbd14 UW |
5247 | if (object == TARGET_OBJECT_SPU) |
5248 | return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf, | |
5249 | offset, len); | |
5250 | ||
8f313923 JK |
5251 | /* GDB calculates all the addresses in possibly larget width of the address. |
5252 | Address width needs to be masked before its final use - either by | |
5253 | linux_proc_xfer_partial or inf_ptrace_xfer_partial. | |
5254 | ||
5255 | Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */ | |
5256 | ||
5257 | if (object == TARGET_OBJECT_MEMORY) | |
5258 | { | |
5259 | int addr_bit = gdbarch_addr_bit (target_gdbarch); | |
5260 | ||
5261 | if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT)) | |
5262 | offset &= ((ULONGEST) 1 << addr_bit) - 1; | |
5263 | } | |
5264 | ||
10d6c8cd DJ |
5265 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
5266 | offset, len); | |
5267 | if (xfer != 0) | |
5268 | return xfer; | |
5269 | ||
5270 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
5271 | offset, len); | |
5272 | } | |
5273 | ||
e9efe249 | 5274 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
5275 | it with local methods. */ |
5276 | ||
910122bf UW |
5277 | static void |
5278 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 5279 | { |
6d8fd2b7 | 5280 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
eb73ad13 | 5281 | t->to_remove_fork_catchpoint = linux_child_remove_fork_catchpoint; |
6d8fd2b7 | 5282 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; |
eb73ad13 | 5283 | t->to_remove_vfork_catchpoint = linux_child_remove_vfork_catchpoint; |
6d8fd2b7 | 5284 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; |
eb73ad13 | 5285 | t->to_remove_exec_catchpoint = linux_child_remove_exec_catchpoint; |
a96d9b2e | 5286 | t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint; |
6d8fd2b7 | 5287 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; |
10d6c8cd | 5288 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
5289 | t->to_post_attach = linux_child_post_attach; |
5290 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
5291 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
5292 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
5293 | ||
5294 | super_xfer_partial = t->to_xfer_partial; | |
5295 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
5296 | } |
5297 | ||
5298 | struct target_ops * | |
5299 | linux_target (void) | |
5300 | { | |
5301 | struct target_ops *t; | |
5302 | ||
5303 | t = inf_ptrace_target (); | |
5304 | linux_target_install_ops (t); | |
5305 | ||
5306 | return t; | |
5307 | } | |
5308 | ||
5309 | struct target_ops * | |
7714d83a | 5310 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
5311 | { |
5312 | struct target_ops *t; | |
5313 | ||
5314 | t = inf_ptrace_trad_target (register_u_offset); | |
5315 | linux_target_install_ops (t); | |
10d6c8cd | 5316 | |
10d6c8cd DJ |
5317 | return t; |
5318 | } | |
5319 | ||
b84876c2 PA |
5320 | /* target_is_async_p implementation. */ |
5321 | ||
5322 | static int | |
5323 | linux_nat_is_async_p (void) | |
5324 | { | |
5325 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5326 | it explicitly with the "set target-async" command. |
b84876c2 | 5327 | Someday, linux will always be async. */ |
3dd5b83d | 5328 | return target_async_permitted; |
b84876c2 PA |
5329 | } |
5330 | ||
5331 | /* target_can_async_p implementation. */ | |
5332 | ||
5333 | static int | |
5334 | linux_nat_can_async_p (void) | |
5335 | { | |
5336 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5337 | it explicitly with the "set target-async" command. |
b84876c2 | 5338 | Someday, linux will always be async. */ |
3dd5b83d | 5339 | return target_async_permitted; |
b84876c2 PA |
5340 | } |
5341 | ||
9908b566 VP |
5342 | static int |
5343 | linux_nat_supports_non_stop (void) | |
5344 | { | |
5345 | return 1; | |
5346 | } | |
5347 | ||
d90e17a7 PA |
5348 | /* True if we want to support multi-process. To be removed when GDB |
5349 | supports multi-exec. */ | |
5350 | ||
2277426b | 5351 | int linux_multi_process = 1; |
d90e17a7 PA |
5352 | |
5353 | static int | |
5354 | linux_nat_supports_multi_process (void) | |
5355 | { | |
5356 | return linux_multi_process; | |
5357 | } | |
5358 | ||
03583c20 UW |
5359 | static int |
5360 | linux_nat_supports_disable_randomization (void) | |
5361 | { | |
5362 | #ifdef HAVE_PERSONALITY | |
5363 | return 1; | |
5364 | #else | |
5365 | return 0; | |
5366 | #endif | |
5367 | } | |
5368 | ||
b84876c2 PA |
5369 | static int async_terminal_is_ours = 1; |
5370 | ||
5371 | /* target_terminal_inferior implementation. */ | |
5372 | ||
5373 | static void | |
5374 | linux_nat_terminal_inferior (void) | |
5375 | { | |
5376 | if (!target_is_async_p ()) | |
5377 | { | |
5378 | /* Async mode is disabled. */ | |
5379 | terminal_inferior (); | |
5380 | return; | |
5381 | } | |
5382 | ||
b84876c2 PA |
5383 | terminal_inferior (); |
5384 | ||
d9d2d8b6 | 5385 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
5386 | if (!async_terminal_is_ours) |
5387 | return; | |
5388 | ||
5389 | delete_file_handler (input_fd); | |
5390 | async_terminal_is_ours = 0; | |
5391 | set_sigint_trap (); | |
5392 | } | |
5393 | ||
5394 | /* target_terminal_ours implementation. */ | |
5395 | ||
2c0b251b | 5396 | static void |
b84876c2 PA |
5397 | linux_nat_terminal_ours (void) |
5398 | { | |
5399 | if (!target_is_async_p ()) | |
5400 | { | |
5401 | /* Async mode is disabled. */ | |
5402 | terminal_ours (); | |
5403 | return; | |
5404 | } | |
5405 | ||
5406 | /* GDB should never give the terminal to the inferior if the | |
5407 | inferior is running in the background (run&, continue&, etc.), | |
5408 | but claiming it sure should. */ | |
5409 | terminal_ours (); | |
5410 | ||
b84876c2 PA |
5411 | if (async_terminal_is_ours) |
5412 | return; | |
5413 | ||
5414 | clear_sigint_trap (); | |
5415 | add_file_handler (input_fd, stdin_event_handler, 0); | |
5416 | async_terminal_is_ours = 1; | |
5417 | } | |
5418 | ||
5419 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
5420 | void *context); | |
5421 | static void *async_client_context; | |
5422 | ||
7feb7d06 PA |
5423 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5424 | so we notice when any child changes state, and notify the | |
5425 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
5426 | above to wait for the arrival of a SIGCHLD. */ | |
5427 | ||
b84876c2 | 5428 | static void |
7feb7d06 | 5429 | sigchld_handler (int signo) |
b84876c2 | 5430 | { |
7feb7d06 PA |
5431 | int old_errno = errno; |
5432 | ||
01124a23 DE |
5433 | if (debug_linux_nat) |
5434 | ui_file_write_async_safe (gdb_stdlog, | |
5435 | "sigchld\n", sizeof ("sigchld\n") - 1); | |
7feb7d06 PA |
5436 | |
5437 | if (signo == SIGCHLD | |
5438 | && linux_nat_event_pipe[0] != -1) | |
5439 | async_file_mark (); /* Let the event loop know that there are | |
5440 | events to handle. */ | |
5441 | ||
5442 | errno = old_errno; | |
5443 | } | |
5444 | ||
5445 | /* Callback registered with the target events file descriptor. */ | |
5446 | ||
5447 | static void | |
5448 | handle_target_event (int error, gdb_client_data client_data) | |
5449 | { | |
5450 | (*async_client_callback) (INF_REG_EVENT, async_client_context); | |
5451 | } | |
5452 | ||
5453 | /* Create/destroy the target events pipe. Returns previous state. */ | |
5454 | ||
5455 | static int | |
5456 | linux_async_pipe (int enable) | |
5457 | { | |
5458 | int previous = (linux_nat_event_pipe[0] != -1); | |
5459 | ||
5460 | if (previous != enable) | |
5461 | { | |
5462 | sigset_t prev_mask; | |
5463 | ||
5464 | block_child_signals (&prev_mask); | |
5465 | ||
5466 | if (enable) | |
5467 | { | |
5468 | if (pipe (linux_nat_event_pipe) == -1) | |
5469 | internal_error (__FILE__, __LINE__, | |
5470 | "creating event pipe failed."); | |
5471 | ||
5472 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5473 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5474 | } | |
5475 | else | |
5476 | { | |
5477 | close (linux_nat_event_pipe[0]); | |
5478 | close (linux_nat_event_pipe[1]); | |
5479 | linux_nat_event_pipe[0] = -1; | |
5480 | linux_nat_event_pipe[1] = -1; | |
5481 | } | |
5482 | ||
5483 | restore_child_signals_mask (&prev_mask); | |
5484 | } | |
5485 | ||
5486 | return previous; | |
b84876c2 PA |
5487 | } |
5488 | ||
5489 | /* target_async implementation. */ | |
5490 | ||
5491 | static void | |
5492 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
5493 | void *context), void *context) | |
5494 | { | |
b84876c2 PA |
5495 | if (callback != NULL) |
5496 | { | |
5497 | async_client_callback = callback; | |
5498 | async_client_context = context; | |
7feb7d06 PA |
5499 | if (!linux_async_pipe (1)) |
5500 | { | |
5501 | add_file_handler (linux_nat_event_pipe[0], | |
5502 | handle_target_event, NULL); | |
5503 | /* There may be pending events to handle. Tell the event loop | |
5504 | to poll them. */ | |
5505 | async_file_mark (); | |
5506 | } | |
b84876c2 PA |
5507 | } |
5508 | else | |
5509 | { | |
5510 | async_client_callback = callback; | |
5511 | async_client_context = context; | |
b84876c2 | 5512 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 5513 | linux_async_pipe (0); |
b84876c2 PA |
5514 | } |
5515 | return; | |
5516 | } | |
5517 | ||
252fbfc8 PA |
5518 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
5519 | event came out. */ | |
5520 | ||
4c28f408 | 5521 | static int |
252fbfc8 | 5522 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 5523 | { |
d90e17a7 | 5524 | if (!lwp->stopped) |
252fbfc8 | 5525 | { |
d90e17a7 | 5526 | ptid_t ptid = lwp->ptid; |
252fbfc8 | 5527 | |
d90e17a7 PA |
5528 | if (debug_linux_nat) |
5529 | fprintf_unfiltered (gdb_stdlog, | |
5530 | "LNSL: running -> suspending %s\n", | |
5531 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 5532 | |
252fbfc8 | 5533 | |
25289eb2 PA |
5534 | if (lwp->last_resume_kind == resume_stop) |
5535 | { | |
5536 | if (debug_linux_nat) | |
5537 | fprintf_unfiltered (gdb_stdlog, | |
5538 | "linux-nat: already stopping LWP %ld at " | |
5539 | "GDB's request\n", | |
5540 | ptid_get_lwp (lwp->ptid)); | |
5541 | return 0; | |
5542 | } | |
252fbfc8 | 5543 | |
25289eb2 PA |
5544 | stop_callback (lwp, NULL); |
5545 | lwp->last_resume_kind = resume_stop; | |
d90e17a7 PA |
5546 | } |
5547 | else | |
5548 | { | |
5549 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 5550 | |
d90e17a7 PA |
5551 | if (debug_linux_nat) |
5552 | { | |
e09875d4 | 5553 | if (find_thread_ptid (lwp->ptid)->stop_requested) |
3e43a32a MS |
5554 | fprintf_unfiltered (gdb_stdlog, |
5555 | "LNSL: already stopped/stop_requested %s\n", | |
d90e17a7 PA |
5556 | target_pid_to_str (lwp->ptid)); |
5557 | else | |
3e43a32a MS |
5558 | fprintf_unfiltered (gdb_stdlog, |
5559 | "LNSL: already stopped/no " | |
5560 | "stop_requested yet %s\n", | |
d90e17a7 | 5561 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
5562 | } |
5563 | } | |
4c28f408 PA |
5564 | return 0; |
5565 | } | |
5566 | ||
5567 | static void | |
5568 | linux_nat_stop (ptid_t ptid) | |
5569 | { | |
5570 | if (non_stop) | |
d90e17a7 | 5571 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4c28f408 PA |
5572 | else |
5573 | linux_ops->to_stop (ptid); | |
5574 | } | |
5575 | ||
d90e17a7 PA |
5576 | static void |
5577 | linux_nat_close (int quitting) | |
5578 | { | |
5579 | /* Unregister from the event loop. */ | |
5580 | if (target_is_async_p ()) | |
5581 | target_async (NULL, 0); | |
5582 | ||
d90e17a7 PA |
5583 | if (linux_ops->to_close) |
5584 | linux_ops->to_close (quitting); | |
5585 | } | |
5586 | ||
c0694254 PA |
5587 | /* When requests are passed down from the linux-nat layer to the |
5588 | single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are | |
5589 | used. The address space pointer is stored in the inferior object, | |
5590 | but the common code that is passed such ptid can't tell whether | |
5591 | lwpid is a "main" process id or not (it assumes so). We reverse | |
5592 | look up the "main" process id from the lwp here. */ | |
5593 | ||
5594 | struct address_space * | |
5595 | linux_nat_thread_address_space (struct target_ops *t, ptid_t ptid) | |
5596 | { | |
5597 | struct lwp_info *lwp; | |
5598 | struct inferior *inf; | |
5599 | int pid; | |
5600 | ||
5601 | pid = GET_LWP (ptid); | |
5602 | if (GET_LWP (ptid) == 0) | |
5603 | { | |
5604 | /* An (lwpid,0,0) ptid. Look up the lwp object to get at the | |
5605 | tgid. */ | |
5606 | lwp = find_lwp_pid (ptid); | |
5607 | pid = GET_PID (lwp->ptid); | |
5608 | } | |
5609 | else | |
5610 | { | |
5611 | /* A (pid,lwpid,0) ptid. */ | |
5612 | pid = GET_PID (ptid); | |
5613 | } | |
5614 | ||
5615 | inf = find_inferior_pid (pid); | |
5616 | gdb_assert (inf != NULL); | |
5617 | return inf->aspace; | |
5618 | } | |
5619 | ||
dc146f7c VP |
5620 | int |
5621 | linux_nat_core_of_thread_1 (ptid_t ptid) | |
5622 | { | |
5623 | struct cleanup *back_to; | |
5624 | char *filename; | |
5625 | FILE *f; | |
5626 | char *content = NULL; | |
5627 | char *p; | |
5628 | char *ts = 0; | |
5629 | int content_read = 0; | |
5630 | int i; | |
5631 | int core; | |
5632 | ||
5633 | filename = xstrprintf ("/proc/%d/task/%ld/stat", | |
5634 | GET_PID (ptid), GET_LWP (ptid)); | |
5635 | back_to = make_cleanup (xfree, filename); | |
5636 | ||
5637 | f = fopen (filename, "r"); | |
5638 | if (!f) | |
5639 | { | |
5640 | do_cleanups (back_to); | |
5641 | return -1; | |
5642 | } | |
5643 | ||
5644 | make_cleanup_fclose (f); | |
5645 | ||
5646 | for (;;) | |
5647 | { | |
5648 | int n; | |
e0881a8e | 5649 | |
dc146f7c VP |
5650 | content = xrealloc (content, content_read + 1024); |
5651 | n = fread (content + content_read, 1, 1024, f); | |
5652 | content_read += n; | |
5653 | if (n < 1024) | |
5654 | { | |
5655 | content[content_read] = '\0'; | |
5656 | break; | |
5657 | } | |
5658 | } | |
5659 | ||
5660 | make_cleanup (xfree, content); | |
5661 | ||
5662 | p = strchr (content, '('); | |
ca2a87a0 JK |
5663 | |
5664 | /* Skip ")". */ | |
5665 | if (p != NULL) | |
5666 | p = strchr (p, ')'); | |
5667 | if (p != NULL) | |
5668 | p++; | |
dc146f7c VP |
5669 | |
5670 | /* If the first field after program name has index 0, then core number is | |
5671 | the field with index 36. There's no constant for that anywhere. */ | |
ca2a87a0 JK |
5672 | if (p != NULL) |
5673 | p = strtok_r (p, " ", &ts); | |
5674 | for (i = 0; p != NULL && i != 36; ++i) | |
dc146f7c VP |
5675 | p = strtok_r (NULL, " ", &ts); |
5676 | ||
ca2a87a0 | 5677 | if (p == NULL || sscanf (p, "%d", &core) == 0) |
dc146f7c VP |
5678 | core = -1; |
5679 | ||
5680 | do_cleanups (back_to); | |
5681 | ||
5682 | return core; | |
5683 | } | |
5684 | ||
5685 | /* Return the cached value of the processor core for thread PTID. */ | |
5686 | ||
5687 | int | |
5688 | linux_nat_core_of_thread (struct target_ops *ops, ptid_t ptid) | |
5689 | { | |
5690 | struct lwp_info *info = find_lwp_pid (ptid); | |
e0881a8e | 5691 | |
dc146f7c VP |
5692 | if (info) |
5693 | return info->core; | |
5694 | return -1; | |
5695 | } | |
5696 | ||
f973ed9c DJ |
5697 | void |
5698 | linux_nat_add_target (struct target_ops *t) | |
5699 | { | |
f973ed9c DJ |
5700 | /* Save the provided single-threaded target. We save this in a separate |
5701 | variable because another target we've inherited from (e.g. inf-ptrace) | |
5702 | may have saved a pointer to T; we want to use it for the final | |
5703 | process stratum target. */ | |
5704 | linux_ops_saved = *t; | |
5705 | linux_ops = &linux_ops_saved; | |
5706 | ||
5707 | /* Override some methods for multithreading. */ | |
b84876c2 | 5708 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
5709 | t->to_attach = linux_nat_attach; |
5710 | t->to_detach = linux_nat_detach; | |
5711 | t->to_resume = linux_nat_resume; | |
5712 | t->to_wait = linux_nat_wait; | |
2455069d | 5713 | t->to_pass_signals = linux_nat_pass_signals; |
f973ed9c DJ |
5714 | t->to_xfer_partial = linux_nat_xfer_partial; |
5715 | t->to_kill = linux_nat_kill; | |
5716 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
5717 | t->to_thread_alive = linux_nat_thread_alive; | |
5718 | t->to_pid_to_str = linux_nat_pid_to_str; | |
4694da01 | 5719 | t->to_thread_name = linux_nat_thread_name; |
f973ed9c | 5720 | t->to_has_thread_control = tc_schedlock; |
c0694254 | 5721 | t->to_thread_address_space = linux_nat_thread_address_space; |
ebec9a0f PA |
5722 | t->to_stopped_by_watchpoint = linux_nat_stopped_by_watchpoint; |
5723 | t->to_stopped_data_address = linux_nat_stopped_data_address; | |
f973ed9c | 5724 | |
b84876c2 PA |
5725 | t->to_can_async_p = linux_nat_can_async_p; |
5726 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 5727 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 | 5728 | t->to_async = linux_nat_async; |
b84876c2 PA |
5729 | t->to_terminal_inferior = linux_nat_terminal_inferior; |
5730 | t->to_terminal_ours = linux_nat_terminal_ours; | |
d90e17a7 | 5731 | t->to_close = linux_nat_close; |
b84876c2 | 5732 | |
4c28f408 PA |
5733 | /* Methods for non-stop support. */ |
5734 | t->to_stop = linux_nat_stop; | |
5735 | ||
d90e17a7 PA |
5736 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
5737 | ||
03583c20 UW |
5738 | t->to_supports_disable_randomization |
5739 | = linux_nat_supports_disable_randomization; | |
5740 | ||
dc146f7c VP |
5741 | t->to_core_of_thread = linux_nat_core_of_thread; |
5742 | ||
f973ed9c DJ |
5743 | /* We don't change the stratum; this target will sit at |
5744 | process_stratum and thread_db will set at thread_stratum. This | |
5745 | is a little strange, since this is a multi-threaded-capable | |
5746 | target, but we want to be on the stack below thread_db, and we | |
5747 | also want to be used for single-threaded processes. */ | |
5748 | ||
5749 | add_target (t); | |
f973ed9c DJ |
5750 | } |
5751 | ||
9f0bdab8 DJ |
5752 | /* Register a method to call whenever a new thread is attached. */ |
5753 | void | |
5754 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
5755 | { | |
5756 | /* Save the pointer. We only support a single registered instance | |
5757 | of the GNU/Linux native target, so we do not need to map this to | |
5758 | T. */ | |
5759 | linux_nat_new_thread = new_thread; | |
5760 | } | |
5761 | ||
5b009018 PA |
5762 | /* Register a method that converts a siginfo object between the layout |
5763 | that ptrace returns, and the layout in the architecture of the | |
5764 | inferior. */ | |
5765 | void | |
5766 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
5767 | int (*siginfo_fixup) (struct siginfo *, | |
5768 | gdb_byte *, | |
5769 | int)) | |
5770 | { | |
5771 | /* Save the pointer. */ | |
5772 | linux_nat_siginfo_fixup = siginfo_fixup; | |
5773 | } | |
5774 | ||
9f0bdab8 DJ |
5775 | /* Return the saved siginfo associated with PTID. */ |
5776 | struct siginfo * | |
5777 | linux_nat_get_siginfo (ptid_t ptid) | |
5778 | { | |
5779 | struct lwp_info *lp = find_lwp_pid (ptid); | |
5780 | ||
5781 | gdb_assert (lp != NULL); | |
5782 | ||
5783 | return &lp->siginfo; | |
5784 | } | |
5785 | ||
2c0b251b PA |
5786 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
5787 | extern initialize_file_ftype _initialize_linux_nat; | |
5788 | ||
d6b0e80f AC |
5789 | void |
5790 | _initialize_linux_nat (void) | |
5791 | { | |
1bedd215 AC |
5792 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
5793 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
5794 | Specify any process id, or use the program being debugged by default.\n\ |
5795 | Specify any of the following keywords for detailed info:\n\ | |
5796 | mappings -- list of mapped memory regions.\n\ | |
5797 | stat -- list a bunch of random process info.\n\ | |
5798 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 5799 | all -- list all available /proc info.")); |
d6b0e80f | 5800 | |
b84876c2 PA |
5801 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
5802 | &debug_linux_nat, _("\ | |
5803 | Set debugging of GNU/Linux lwp module."), _("\ | |
5804 | Show debugging of GNU/Linux lwp module."), _("\ | |
5805 | Enables printf debugging output."), | |
5806 | NULL, | |
5807 | show_debug_linux_nat, | |
5808 | &setdebuglist, &showdebuglist); | |
5809 | ||
b84876c2 | 5810 | /* Save this mask as the default. */ |
d6b0e80f AC |
5811 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
5812 | ||
7feb7d06 PA |
5813 | /* Install a SIGCHLD handler. */ |
5814 | sigchld_action.sa_handler = sigchld_handler; | |
5815 | sigemptyset (&sigchld_action.sa_mask); | |
5816 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
5817 | |
5818 | /* Make it the default. */ | |
7feb7d06 | 5819 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
5820 | |
5821 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
5822 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
5823 | sigdelset (&suspend_mask, SIGCHLD); | |
5824 | ||
7feb7d06 | 5825 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
5826 | } |
5827 | \f | |
5828 | ||
5829 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
5830 | the GNU/Linux Threads library and therefore doesn't really belong | |
5831 | here. */ | |
5832 | ||
5833 | /* Read variable NAME in the target and return its value if found. | |
5834 | Otherwise return zero. It is assumed that the type of the variable | |
5835 | is `int'. */ | |
5836 | ||
5837 | static int | |
5838 | get_signo (const char *name) | |
5839 | { | |
5840 | struct minimal_symbol *ms; | |
5841 | int signo; | |
5842 | ||
5843 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
5844 | if (ms == NULL) | |
5845 | return 0; | |
5846 | ||
8e70166d | 5847 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
5848 | sizeof (signo)) != 0) |
5849 | return 0; | |
5850 | ||
5851 | return signo; | |
5852 | } | |
5853 | ||
5854 | /* Return the set of signals used by the threads library in *SET. */ | |
5855 | ||
5856 | void | |
5857 | lin_thread_get_thread_signals (sigset_t *set) | |
5858 | { | |
5859 | struct sigaction action; | |
5860 | int restart, cancel; | |
5861 | ||
b84876c2 | 5862 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
5863 | sigemptyset (set); |
5864 | ||
5865 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
5866 | cancel = get_signo ("__pthread_sig_cancel"); |
5867 | ||
5868 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
5869 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
5870 | not provide any way for the debugger to query the signal numbers - | |
5871 | fortunately they don't change! */ | |
5872 | ||
d6b0e80f | 5873 | if (restart == 0) |
17fbb0bd | 5874 | restart = __SIGRTMIN; |
d6b0e80f | 5875 | |
d6b0e80f | 5876 | if (cancel == 0) |
17fbb0bd | 5877 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
5878 | |
5879 | sigaddset (set, restart); | |
5880 | sigaddset (set, cancel); | |
5881 | ||
5882 | /* The GNU/Linux Threads library makes terminating threads send a | |
5883 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
5884 | those (to prevent them from terminating GDB itself, which is | |
5885 | likely to be their default action) and treat them the same way as | |
5886 | SIGCHLD. */ | |
5887 | ||
5888 | action.sa_handler = sigchld_handler; | |
5889 | sigemptyset (&action.sa_mask); | |
58aecb61 | 5890 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
5891 | sigaction (cancel, &action, NULL); |
5892 | ||
5893 | /* We block the "cancel" signal throughout this code ... */ | |
5894 | sigaddset (&blocked_mask, cancel); | |
5895 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
5896 | ||
5897 | /* ... except during a sigsuspend. */ | |
5898 | sigdelset (&suspend_mask, cancel); | |
5899 | } |