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)); | |
0ec9a092 | 574 | check_for_thread_db (); |
a96d9b2e | 575 | linux_enable_tracesysgood (pid_to_ptid (pid)); |
4de4c07c DJ |
576 | } |
577 | ||
10d6c8cd | 578 | static void |
4de4c07c DJ |
579 | linux_child_post_startup_inferior (ptid_t ptid) |
580 | { | |
581 | linux_enable_event_reporting (ptid); | |
0ec9a092 | 582 | check_for_thread_db (); |
a96d9b2e | 583 | linux_enable_tracesysgood (ptid); |
4de4c07c DJ |
584 | } |
585 | ||
6d8fd2b7 UW |
586 | static int |
587 | linux_child_follow_fork (struct target_ops *ops, int follow_child) | |
3993f6b1 | 588 | { |
7feb7d06 | 589 | sigset_t prev_mask; |
9016a515 | 590 | int has_vforked; |
4de4c07c DJ |
591 | int parent_pid, child_pid; |
592 | ||
7feb7d06 | 593 | block_child_signals (&prev_mask); |
b84876c2 | 594 | |
e58b0e63 PA |
595 | has_vforked = (inferior_thread ()->pending_follow.kind |
596 | == TARGET_WAITKIND_VFORKED); | |
597 | parent_pid = ptid_get_lwp (inferior_ptid); | |
d3587048 | 598 | if (parent_pid == 0) |
e58b0e63 PA |
599 | parent_pid = ptid_get_pid (inferior_ptid); |
600 | child_pid = PIDGET (inferior_thread ()->pending_follow.value.related_pid); | |
4de4c07c | 601 | |
2277426b PA |
602 | if (!detach_fork) |
603 | linux_enable_event_reporting (pid_to_ptid (child_pid)); | |
604 | ||
6c95b8df PA |
605 | if (has_vforked |
606 | && !non_stop /* Non-stop always resumes both branches. */ | |
607 | && (!target_is_async_p () || sync_execution) | |
608 | && !(follow_child || detach_fork || sched_multi)) | |
609 | { | |
610 | /* The parent stays blocked inside the vfork syscall until the | |
611 | child execs or exits. If we don't let the child run, then | |
612 | the parent stays blocked. If we're telling the parent to run | |
613 | in the foreground, the user will not be able to ctrl-c to get | |
614 | back the terminal, effectively hanging the debug session. */ | |
ac74f770 MS |
615 | fprintf_filtered (gdb_stderr, _("\ |
616 | Can not resume the parent process over vfork in the foreground while\n\ | |
617 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
618 | \"set schedule-multiple\".\n")); | |
619 | /* FIXME output string > 80 columns. */ | |
6c95b8df PA |
620 | return 1; |
621 | } | |
622 | ||
4de4c07c DJ |
623 | if (! follow_child) |
624 | { | |
6c95b8df | 625 | struct lwp_info *child_lp = NULL; |
4de4c07c | 626 | |
1777feb0 | 627 | /* We're already attached to the parent, by default. */ |
4de4c07c | 628 | |
ac264b3b MS |
629 | /* Detach new forked process? */ |
630 | if (detach_fork) | |
f75c00e4 | 631 | { |
6c95b8df PA |
632 | /* Before detaching from the child, remove all breakpoints |
633 | from it. If we forked, then this has already been taken | |
634 | care of by infrun.c. If we vforked however, any | |
635 | breakpoint inserted in the parent is visible in the | |
636 | child, even those added while stopped in a vfork | |
637 | catchpoint. This will remove the breakpoints from the | |
638 | parent also, but they'll be reinserted below. */ | |
639 | if (has_vforked) | |
640 | { | |
641 | /* keep breakpoints list in sync. */ | |
642 | remove_breakpoints_pid (GET_PID (inferior_ptid)); | |
643 | } | |
644 | ||
e85a822c | 645 | if (info_verbose || debug_linux_nat) |
ac264b3b MS |
646 | { |
647 | target_terminal_ours (); | |
648 | fprintf_filtered (gdb_stdlog, | |
3e43a32a MS |
649 | "Detaching after fork from " |
650 | "child process %d.\n", | |
ac264b3b MS |
651 | child_pid); |
652 | } | |
4de4c07c | 653 | |
ac264b3b MS |
654 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
655 | } | |
656 | else | |
657 | { | |
77435e4c | 658 | struct inferior *parent_inf, *child_inf; |
2277426b | 659 | struct cleanup *old_chain; |
7f9f62ba PA |
660 | |
661 | /* Add process to GDB's tables. */ | |
77435e4c PA |
662 | child_inf = add_inferior (child_pid); |
663 | ||
e58b0e63 | 664 | parent_inf = current_inferior (); |
77435e4c | 665 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 666 | copy_terminal_info (child_inf, parent_inf); |
7f9f62ba | 667 | |
2277426b | 668 | old_chain = save_inferior_ptid (); |
6c95b8df | 669 | save_current_program_space (); |
2277426b PA |
670 | |
671 | inferior_ptid = ptid_build (child_pid, child_pid, 0); | |
672 | add_thread (inferior_ptid); | |
6c95b8df PA |
673 | child_lp = add_lwp (inferior_ptid); |
674 | child_lp->stopped = 1; | |
25289eb2 | 675 | child_lp->last_resume_kind = resume_stop; |
2277426b | 676 | |
6c95b8df PA |
677 | /* If this is a vfork child, then the address-space is |
678 | shared with the parent. */ | |
679 | if (has_vforked) | |
680 | { | |
681 | child_inf->pspace = parent_inf->pspace; | |
682 | child_inf->aspace = parent_inf->aspace; | |
683 | ||
684 | /* The parent will be frozen until the child is done | |
685 | with the shared region. Keep track of the | |
686 | parent. */ | |
687 | child_inf->vfork_parent = parent_inf; | |
688 | child_inf->pending_detach = 0; | |
689 | parent_inf->vfork_child = child_inf; | |
690 | parent_inf->pending_detach = 0; | |
691 | } | |
692 | else | |
693 | { | |
694 | child_inf->aspace = new_address_space (); | |
695 | child_inf->pspace = add_program_space (child_inf->aspace); | |
696 | child_inf->removable = 1; | |
697 | set_current_program_space (child_inf->pspace); | |
698 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
699 | ||
700 | /* Let the shared library layer (solib-svr4) learn about | |
701 | this new process, relocate the cloned exec, pull in | |
702 | shared libraries, and install the solib event | |
703 | breakpoint. If a "cloned-VM" event was propagated | |
704 | better throughout the core, this wouldn't be | |
705 | required. */ | |
268a4a75 | 706 | solib_create_inferior_hook (0); |
6c95b8df PA |
707 | } |
708 | ||
709 | /* Let the thread_db layer learn about this new process. */ | |
2277426b PA |
710 | check_for_thread_db (); |
711 | ||
712 | do_cleanups (old_chain); | |
ac264b3b | 713 | } |
9016a515 DJ |
714 | |
715 | if (has_vforked) | |
716 | { | |
3ced3da4 | 717 | struct lwp_info *parent_lp; |
6c95b8df PA |
718 | struct inferior *parent_inf; |
719 | ||
720 | parent_inf = current_inferior (); | |
721 | ||
722 | /* If we detached from the child, then we have to be careful | |
723 | to not insert breakpoints in the parent until the child | |
724 | is done with the shared memory region. However, if we're | |
725 | staying attached to the child, then we can and should | |
726 | insert breakpoints, so that we can debug it. A | |
727 | subsequent child exec or exit is enough to know when does | |
728 | the child stops using the parent's address space. */ | |
729 | parent_inf->waiting_for_vfork_done = detach_fork; | |
56710373 | 730 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; |
6c95b8df | 731 | |
3ced3da4 | 732 | parent_lp = find_lwp_pid (pid_to_ptid (parent_pid)); |
b957e937 | 733 | gdb_assert (linux_supports_tracefork_flag >= 0); |
3ced3da4 | 734 | |
b957e937 | 735 | if (linux_supports_tracevforkdone (0)) |
9016a515 | 736 | { |
6c95b8df PA |
737 | if (debug_linux_nat) |
738 | fprintf_unfiltered (gdb_stdlog, | |
739 | "LCFF: waiting for VFORK_DONE on %d\n", | |
740 | parent_pid); | |
3ced3da4 | 741 | parent_lp->stopped = 1; |
9016a515 | 742 | |
6c95b8df PA |
743 | /* We'll handle the VFORK_DONE event like any other |
744 | event, in target_wait. */ | |
9016a515 DJ |
745 | } |
746 | else | |
747 | { | |
748 | /* We can't insert breakpoints until the child has | |
749 | finished with the shared memory region. We need to | |
750 | wait until that happens. Ideal would be to just | |
751 | call: | |
752 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
753 | - waitpid (parent_pid, &status, __WALL); | |
754 | However, most architectures can't handle a syscall | |
755 | being traced on the way out if it wasn't traced on | |
756 | the way in. | |
757 | ||
758 | We might also think to loop, continuing the child | |
759 | until it exits or gets a SIGTRAP. One problem is | |
760 | that the child might call ptrace with PTRACE_TRACEME. | |
761 | ||
762 | There's no simple and reliable way to figure out when | |
763 | the vforked child will be done with its copy of the | |
764 | shared memory. We could step it out of the syscall, | |
765 | two instructions, let it go, and then single-step the | |
766 | parent once. When we have hardware single-step, this | |
767 | would work; with software single-step it could still | |
768 | be made to work but we'd have to be able to insert | |
769 | single-step breakpoints in the child, and we'd have | |
770 | to insert -just- the single-step breakpoint in the | |
771 | parent. Very awkward. | |
772 | ||
773 | In the end, the best we can do is to make sure it | |
774 | runs for a little while. Hopefully it will be out of | |
775 | range of any breakpoints we reinsert. Usually this | |
776 | is only the single-step breakpoint at vfork's return | |
777 | point. */ | |
778 | ||
6c95b8df PA |
779 | if (debug_linux_nat) |
780 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
781 | "LCFF: no VFORK_DONE " |
782 | "support, sleeping a bit\n"); | |
6c95b8df | 783 | |
9016a515 | 784 | usleep (10000); |
9016a515 | 785 | |
6c95b8df PA |
786 | /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event, |
787 | and leave it pending. The next linux_nat_resume call | |
788 | will notice a pending event, and bypasses actually | |
789 | resuming the inferior. */ | |
3ced3da4 PA |
790 | parent_lp->status = 0; |
791 | parent_lp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
792 | parent_lp->stopped = 1; | |
6c95b8df PA |
793 | |
794 | /* If we're in async mode, need to tell the event loop | |
795 | there's something here to process. */ | |
796 | if (target_can_async_p ()) | |
797 | async_file_mark (); | |
798 | } | |
9016a515 | 799 | } |
4de4c07c | 800 | } |
3993f6b1 | 801 | else |
4de4c07c | 802 | { |
77435e4c | 803 | struct inferior *parent_inf, *child_inf; |
3ced3da4 | 804 | struct lwp_info *child_lp; |
6c95b8df | 805 | struct program_space *parent_pspace; |
4de4c07c | 806 | |
e85a822c | 807 | if (info_verbose || debug_linux_nat) |
f75c00e4 DJ |
808 | { |
809 | target_terminal_ours (); | |
6c95b8df | 810 | if (has_vforked) |
3e43a32a MS |
811 | fprintf_filtered (gdb_stdlog, |
812 | _("Attaching after process %d " | |
813 | "vfork to child process %d.\n"), | |
6c95b8df PA |
814 | parent_pid, child_pid); |
815 | else | |
3e43a32a MS |
816 | fprintf_filtered (gdb_stdlog, |
817 | _("Attaching after process %d " | |
818 | "fork to child process %d.\n"), | |
6c95b8df | 819 | parent_pid, child_pid); |
f75c00e4 | 820 | } |
4de4c07c | 821 | |
7a7d3353 PA |
822 | /* Add the new inferior first, so that the target_detach below |
823 | doesn't unpush the target. */ | |
824 | ||
77435e4c PA |
825 | child_inf = add_inferior (child_pid); |
826 | ||
e58b0e63 | 827 | parent_inf = current_inferior (); |
77435e4c | 828 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 829 | copy_terminal_info (child_inf, parent_inf); |
7a7d3353 | 830 | |
6c95b8df | 831 | parent_pspace = parent_inf->pspace; |
9016a515 | 832 | |
6c95b8df PA |
833 | /* If we're vforking, we want to hold on to the parent until the |
834 | child exits or execs. At child exec or exit time we can | |
835 | remove the old breakpoints from the parent and detach or | |
836 | resume debugging it. Otherwise, detach the parent now; we'll | |
837 | want to reuse it's program/address spaces, but we can't set | |
838 | them to the child before removing breakpoints from the | |
839 | parent, otherwise, the breakpoints module could decide to | |
840 | remove breakpoints from the wrong process (since they'd be | |
841 | assigned to the same address space). */ | |
9016a515 DJ |
842 | |
843 | if (has_vforked) | |
7f9f62ba | 844 | { |
6c95b8df PA |
845 | gdb_assert (child_inf->vfork_parent == NULL); |
846 | gdb_assert (parent_inf->vfork_child == NULL); | |
847 | child_inf->vfork_parent = parent_inf; | |
848 | child_inf->pending_detach = 0; | |
849 | parent_inf->vfork_child = child_inf; | |
850 | parent_inf->pending_detach = detach_fork; | |
851 | parent_inf->waiting_for_vfork_done = 0; | |
ac264b3b | 852 | } |
2277426b | 853 | else if (detach_fork) |
b84876c2 | 854 | target_detach (NULL, 0); |
4de4c07c | 855 | |
6c95b8df PA |
856 | /* Note that the detach above makes PARENT_INF dangling. */ |
857 | ||
858 | /* Add the child thread to the appropriate lists, and switch to | |
859 | this new thread, before cloning the program space, and | |
860 | informing the solib layer about this new process. */ | |
861 | ||
9f0bdab8 | 862 | inferior_ptid = ptid_build (child_pid, child_pid, 0); |
2277426b | 863 | add_thread (inferior_ptid); |
3ced3da4 PA |
864 | child_lp = add_lwp (inferior_ptid); |
865 | child_lp->stopped = 1; | |
25289eb2 | 866 | child_lp->last_resume_kind = resume_stop; |
6c95b8df PA |
867 | |
868 | /* If this is a vfork child, then the address-space is shared | |
869 | with the parent. If we detached from the parent, then we can | |
870 | reuse the parent's program/address spaces. */ | |
871 | if (has_vforked || detach_fork) | |
872 | { | |
873 | child_inf->pspace = parent_pspace; | |
874 | child_inf->aspace = child_inf->pspace->aspace; | |
875 | } | |
876 | else | |
877 | { | |
878 | child_inf->aspace = new_address_space (); | |
879 | child_inf->pspace = add_program_space (child_inf->aspace); | |
880 | child_inf->removable = 1; | |
881 | set_current_program_space (child_inf->pspace); | |
882 | clone_program_space (child_inf->pspace, parent_pspace); | |
883 | ||
884 | /* Let the shared library layer (solib-svr4) learn about | |
885 | this new process, relocate the cloned exec, pull in | |
886 | shared libraries, and install the solib event breakpoint. | |
887 | If a "cloned-VM" event was propagated better throughout | |
888 | the core, this wouldn't be required. */ | |
268a4a75 | 889 | solib_create_inferior_hook (0); |
6c95b8df | 890 | } |
ac264b3b | 891 | |
6c95b8df | 892 | /* Let the thread_db layer learn about this new process. */ |
ef29ce1a | 893 | check_for_thread_db (); |
4de4c07c DJ |
894 | } |
895 | ||
7feb7d06 | 896 | restore_child_signals_mask (&prev_mask); |
4de4c07c DJ |
897 | return 0; |
898 | } | |
899 | ||
4de4c07c | 900 | \f |
77b06cd7 | 901 | static int |
6d8fd2b7 | 902 | linux_child_insert_fork_catchpoint (int pid) |
4de4c07c | 903 | { |
77b06cd7 | 904 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
905 | } |
906 | ||
eb73ad13 PA |
907 | static int |
908 | linux_child_remove_fork_catchpoint (int pid) | |
909 | { | |
910 | return 0; | |
911 | } | |
912 | ||
77b06cd7 | 913 | static int |
6d8fd2b7 | 914 | linux_child_insert_vfork_catchpoint (int pid) |
3993f6b1 | 915 | { |
77b06cd7 | 916 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
917 | } |
918 | ||
eb73ad13 PA |
919 | static int |
920 | linux_child_remove_vfork_catchpoint (int pid) | |
921 | { | |
922 | return 0; | |
923 | } | |
924 | ||
77b06cd7 | 925 | static int |
6d8fd2b7 | 926 | linux_child_insert_exec_catchpoint (int pid) |
3993f6b1 | 927 | { |
77b06cd7 | 928 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
929 | } |
930 | ||
eb73ad13 PA |
931 | static int |
932 | linux_child_remove_exec_catchpoint (int pid) | |
933 | { | |
934 | return 0; | |
935 | } | |
936 | ||
a96d9b2e SDJ |
937 | static int |
938 | linux_child_set_syscall_catchpoint (int pid, int needed, int any_count, | |
939 | int table_size, int *table) | |
940 | { | |
77b06cd7 TJB |
941 | if (!linux_supports_tracesysgood (pid)) |
942 | return 1; | |
943 | ||
a96d9b2e SDJ |
944 | /* On GNU/Linux, we ignore the arguments. It means that we only |
945 | enable the syscall catchpoints, but do not disable them. | |
77b06cd7 | 946 | |
a96d9b2e SDJ |
947 | Also, we do not use the `table' information because we do not |
948 | filter system calls here. We let GDB do the logic for us. */ | |
949 | return 0; | |
950 | } | |
951 | ||
d6b0e80f AC |
952 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's |
953 | are processes sharing the same VM space. A multi-threaded process | |
954 | is basically a group of such processes. However, such a grouping | |
955 | is almost entirely a user-space issue; the kernel doesn't enforce | |
956 | such a grouping at all (this might change in the future). In | |
957 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
958 | Threads library) to provide such a grouping. | |
959 | ||
960 | It is perfectly well possible to write a multi-threaded application | |
961 | without the assistance of a threads library, by using the clone | |
962 | system call directly. This module should be able to give some | |
963 | rudimentary support for debugging such applications if developers | |
964 | specify the CLONE_PTRACE flag in the clone system call, and are | |
965 | using the Linux kernel 2.4 or above. | |
966 | ||
967 | Note that there are some peculiarities in GNU/Linux that affect | |
968 | this code: | |
969 | ||
970 | - In general one should specify the __WCLONE flag to waitpid in | |
971 | order to make it report events for any of the cloned processes | |
972 | (and leave it out for the initial process). However, if a cloned | |
973 | process has exited the exit status is only reported if the | |
974 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
975 | we cannot use it since GDB must work on older systems too. | |
976 | ||
977 | - When a traced, cloned process exits and is waited for by the | |
978 | debugger, the kernel reassigns it to the original parent and | |
979 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
980 | library doesn't notice this, which leads to the "zombie problem": | |
981 | When debugged a multi-threaded process that spawns a lot of | |
982 | threads will run out of processes, even if the threads exit, | |
983 | because the "zombies" stay around. */ | |
984 | ||
985 | /* List of known LWPs. */ | |
9f0bdab8 | 986 | struct lwp_info *lwp_list; |
d6b0e80f AC |
987 | \f |
988 | ||
d6b0e80f AC |
989 | /* Original signal mask. */ |
990 | static sigset_t normal_mask; | |
991 | ||
992 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
993 | _initialize_linux_nat. */ | |
994 | static sigset_t suspend_mask; | |
995 | ||
7feb7d06 PA |
996 | /* Signals to block to make that sigsuspend work. */ |
997 | static sigset_t blocked_mask; | |
998 | ||
999 | /* SIGCHLD action. */ | |
1000 | struct sigaction sigchld_action; | |
b84876c2 | 1001 | |
7feb7d06 PA |
1002 | /* Block child signals (SIGCHLD and linux threads signals), and store |
1003 | the previous mask in PREV_MASK. */ | |
84e46146 | 1004 | |
7feb7d06 PA |
1005 | static void |
1006 | block_child_signals (sigset_t *prev_mask) | |
1007 | { | |
1008 | /* Make sure SIGCHLD is blocked. */ | |
1009 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
1010 | sigaddset (&blocked_mask, SIGCHLD); | |
1011 | ||
1012 | sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask); | |
1013 | } | |
1014 | ||
1015 | /* Restore child signals mask, previously returned by | |
1016 | block_child_signals. */ | |
1017 | ||
1018 | static void | |
1019 | restore_child_signals_mask (sigset_t *prev_mask) | |
1020 | { | |
1021 | sigprocmask (SIG_SETMASK, prev_mask, NULL); | |
1022 | } | |
2455069d UW |
1023 | |
1024 | /* Mask of signals to pass directly to the inferior. */ | |
1025 | static sigset_t pass_mask; | |
1026 | ||
1027 | /* Update signals to pass to the inferior. */ | |
1028 | static void | |
1029 | linux_nat_pass_signals (int numsigs, unsigned char *pass_signals) | |
1030 | { | |
1031 | int signo; | |
1032 | ||
1033 | sigemptyset (&pass_mask); | |
1034 | ||
1035 | for (signo = 1; signo < NSIG; signo++) | |
1036 | { | |
1037 | int target_signo = target_signal_from_host (signo); | |
1038 | if (target_signo < numsigs && pass_signals[target_signo]) | |
1039 | sigaddset (&pass_mask, signo); | |
1040 | } | |
1041 | } | |
1042 | ||
d6b0e80f AC |
1043 | \f |
1044 | ||
1045 | /* Prototypes for local functions. */ | |
1046 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
28439f5e | 1047 | static int linux_thread_alive (ptid_t ptid); |
6d8fd2b7 | 1048 | static char *linux_child_pid_to_exec_file (int pid); |
710151dd | 1049 | |
d6b0e80f AC |
1050 | \f |
1051 | /* Convert wait status STATUS to a string. Used for printing debug | |
1052 | messages only. */ | |
1053 | ||
1054 | static char * | |
1055 | status_to_str (int status) | |
1056 | { | |
1057 | static char buf[64]; | |
1058 | ||
1059 | if (WIFSTOPPED (status)) | |
206aa767 | 1060 | { |
ca2163eb | 1061 | if (WSTOPSIG (status) == SYSCALL_SIGTRAP) |
206aa767 DE |
1062 | snprintf (buf, sizeof (buf), "%s (stopped at syscall)", |
1063 | strsignal (SIGTRAP)); | |
1064 | else | |
1065 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
1066 | strsignal (WSTOPSIG (status))); | |
1067 | } | |
d6b0e80f AC |
1068 | else if (WIFSIGNALED (status)) |
1069 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
ba9b2ec3 | 1070 | strsignal (WTERMSIG (status))); |
d6b0e80f AC |
1071 | else |
1072 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
1073 | ||
1074 | return buf; | |
1075 | } | |
1076 | ||
d90e17a7 PA |
1077 | /* Remove all LWPs belong to PID from the lwp list. */ |
1078 | ||
1079 | static void | |
1080 | purge_lwp_list (int pid) | |
1081 | { | |
1082 | struct lwp_info *lp, *lpprev, *lpnext; | |
1083 | ||
1084 | lpprev = NULL; | |
1085 | ||
1086 | for (lp = lwp_list; lp; lp = lpnext) | |
1087 | { | |
1088 | lpnext = lp->next; | |
1089 | ||
1090 | if (ptid_get_pid (lp->ptid) == pid) | |
1091 | { | |
1092 | if (lp == lwp_list) | |
1093 | lwp_list = lp->next; | |
1094 | else | |
1095 | lpprev->next = lp->next; | |
1096 | ||
1097 | xfree (lp); | |
1098 | } | |
1099 | else | |
1100 | lpprev = lp; | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | /* Return the number of known LWPs in the tgid given by PID. */ | |
1105 | ||
1106 | static int | |
1107 | num_lwps (int pid) | |
1108 | { | |
1109 | int count = 0; | |
1110 | struct lwp_info *lp; | |
1111 | ||
1112 | for (lp = lwp_list; lp; lp = lp->next) | |
1113 | if (ptid_get_pid (lp->ptid) == pid) | |
1114 | count++; | |
1115 | ||
1116 | return count; | |
d6b0e80f AC |
1117 | } |
1118 | ||
f973ed9c | 1119 | /* Add the LWP specified by PID to the list. Return a pointer to the |
9f0bdab8 DJ |
1120 | structure describing the new LWP. The LWP should already be stopped |
1121 | (with an exception for the very first LWP). */ | |
d6b0e80f AC |
1122 | |
1123 | static struct lwp_info * | |
1124 | add_lwp (ptid_t ptid) | |
1125 | { | |
1126 | struct lwp_info *lp; | |
1127 | ||
1128 | gdb_assert (is_lwp (ptid)); | |
1129 | ||
1130 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
1131 | ||
1132 | memset (lp, 0, sizeof (struct lwp_info)); | |
1133 | ||
25289eb2 | 1134 | lp->last_resume_kind = resume_continue; |
d6b0e80f AC |
1135 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; |
1136 | ||
1137 | lp->ptid = ptid; | |
dc146f7c | 1138 | lp->core = -1; |
d6b0e80f AC |
1139 | |
1140 | lp->next = lwp_list; | |
1141 | lwp_list = lp; | |
d6b0e80f | 1142 | |
d90e17a7 | 1143 | if (num_lwps (GET_PID (ptid)) > 1 && linux_nat_new_thread != NULL) |
9f0bdab8 DJ |
1144 | linux_nat_new_thread (ptid); |
1145 | ||
d6b0e80f AC |
1146 | return lp; |
1147 | } | |
1148 | ||
1149 | /* Remove the LWP specified by PID from the list. */ | |
1150 | ||
1151 | static void | |
1152 | delete_lwp (ptid_t ptid) | |
1153 | { | |
1154 | struct lwp_info *lp, *lpprev; | |
1155 | ||
1156 | lpprev = NULL; | |
1157 | ||
1158 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
1159 | if (ptid_equal (lp->ptid, ptid)) | |
1160 | break; | |
1161 | ||
1162 | if (!lp) | |
1163 | return; | |
1164 | ||
d6b0e80f AC |
1165 | if (lpprev) |
1166 | lpprev->next = lp->next; | |
1167 | else | |
1168 | lwp_list = lp->next; | |
1169 | ||
1170 | xfree (lp); | |
1171 | } | |
1172 | ||
1173 | /* Return a pointer to the structure describing the LWP corresponding | |
1174 | to PID. If no corresponding LWP could be found, return NULL. */ | |
1175 | ||
1176 | static struct lwp_info * | |
1177 | find_lwp_pid (ptid_t ptid) | |
1178 | { | |
1179 | struct lwp_info *lp; | |
1180 | int lwp; | |
1181 | ||
1182 | if (is_lwp (ptid)) | |
1183 | lwp = GET_LWP (ptid); | |
1184 | else | |
1185 | lwp = GET_PID (ptid); | |
1186 | ||
1187 | for (lp = lwp_list; lp; lp = lp->next) | |
1188 | if (lwp == GET_LWP (lp->ptid)) | |
1189 | return lp; | |
1190 | ||
1191 | return NULL; | |
1192 | } | |
1193 | ||
1194 | /* Call CALLBACK with its second argument set to DATA for every LWP in | |
1195 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1196 | pointer to the structure describing that LWP immediately. | |
1197 | Otherwise return NULL. */ | |
1198 | ||
1199 | struct lwp_info * | |
d90e17a7 PA |
1200 | iterate_over_lwps (ptid_t filter, |
1201 | int (*callback) (struct lwp_info *, void *), | |
1202 | void *data) | |
d6b0e80f AC |
1203 | { |
1204 | struct lwp_info *lp, *lpnext; | |
1205 | ||
1206 | for (lp = lwp_list; lp; lp = lpnext) | |
1207 | { | |
1208 | lpnext = lp->next; | |
d90e17a7 PA |
1209 | |
1210 | if (ptid_match (lp->ptid, filter)) | |
1211 | { | |
1212 | if ((*callback) (lp, data)) | |
1213 | return lp; | |
1214 | } | |
d6b0e80f AC |
1215 | } |
1216 | ||
1217 | return NULL; | |
1218 | } | |
1219 | ||
2277426b PA |
1220 | /* Update our internal state when changing from one checkpoint to |
1221 | another indicated by NEW_PTID. We can only switch single-threaded | |
1222 | applications, so we only create one new LWP, and the previous list | |
1223 | is discarded. */ | |
f973ed9c DJ |
1224 | |
1225 | void | |
1226 | linux_nat_switch_fork (ptid_t new_ptid) | |
1227 | { | |
1228 | struct lwp_info *lp; | |
1229 | ||
2277426b PA |
1230 | purge_lwp_list (GET_PID (inferior_ptid)); |
1231 | ||
f973ed9c DJ |
1232 | lp = add_lwp (new_ptid); |
1233 | lp->stopped = 1; | |
e26af52f | 1234 | |
2277426b PA |
1235 | /* This changes the thread's ptid while preserving the gdb thread |
1236 | num. Also changes the inferior pid, while preserving the | |
1237 | inferior num. */ | |
1238 | thread_change_ptid (inferior_ptid, new_ptid); | |
1239 | ||
1240 | /* We've just told GDB core that the thread changed target id, but, | |
1241 | in fact, it really is a different thread, with different register | |
1242 | contents. */ | |
1243 | registers_changed (); | |
e26af52f DJ |
1244 | } |
1245 | ||
e26af52f DJ |
1246 | /* Handle the exit of a single thread LP. */ |
1247 | ||
1248 | static void | |
1249 | exit_lwp (struct lwp_info *lp) | |
1250 | { | |
e09875d4 | 1251 | struct thread_info *th = find_thread_ptid (lp->ptid); |
063bfe2e VP |
1252 | |
1253 | if (th) | |
e26af52f | 1254 | { |
17faa917 DJ |
1255 | if (print_thread_events) |
1256 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1257 | ||
4f8d22e3 | 1258 | delete_thread (lp->ptid); |
e26af52f DJ |
1259 | } |
1260 | ||
1261 | delete_lwp (lp->ptid); | |
1262 | } | |
1263 | ||
a0ef4274 DJ |
1264 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1265 | Other states including `T (tracing stop)' are reported as false. */ | |
1266 | ||
1267 | static int | |
1268 | pid_is_stopped (pid_t pid) | |
1269 | { | |
1270 | FILE *status_file; | |
1271 | char buf[100]; | |
1272 | int retval = 0; | |
1273 | ||
1274 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1275 | status_file = fopen (buf, "r"); | |
1276 | if (status_file != NULL) | |
1277 | { | |
1278 | int have_state = 0; | |
1279 | ||
1280 | while (fgets (buf, sizeof (buf), status_file)) | |
1281 | { | |
1282 | if (strncmp (buf, "State:", 6) == 0) | |
1283 | { | |
1284 | have_state = 1; | |
1285 | break; | |
1286 | } | |
1287 | } | |
1288 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1289 | retval = 1; | |
1290 | fclose (status_file); | |
1291 | } | |
1292 | return retval; | |
1293 | } | |
1294 | ||
1295 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1296 | Returns a wait status for that LWP, to cache. */ | |
1297 | ||
1298 | static int | |
1299 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1300 | int *signalled) | |
1301 | { | |
1302 | pid_t new_pid, pid = GET_LWP (ptid); | |
1303 | int status; | |
1304 | ||
1305 | if (pid_is_stopped (pid)) | |
1306 | { | |
1307 | if (debug_linux_nat) | |
1308 | fprintf_unfiltered (gdb_stdlog, | |
1309 | "LNPAW: Attaching to a stopped process\n"); | |
1310 | ||
1311 | /* The process is definitely stopped. It is in a job control | |
1312 | stop, unless the kernel predates the TASK_STOPPED / | |
1313 | TASK_TRACED distinction, in which case it might be in a | |
1314 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1315 | can kill it, signal it, et cetera. | |
1316 | ||
1317 | First make sure there is a pending SIGSTOP. Since we are | |
1318 | already attached, the process can not transition from stopped | |
1319 | to running without a PTRACE_CONT; so we know this signal will | |
1320 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1321 | probably already in the queue (unless this kernel is old | |
1322 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1323 | is not an RT signal, it can only be queued once. */ | |
1324 | kill_lwp (pid, SIGSTOP); | |
1325 | ||
1326 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1327 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1328 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1329 | } | |
1330 | ||
1331 | /* Make sure the initial process is stopped. The user-level threads | |
1332 | layer might want to poke around in the inferior, and that won't | |
1333 | work if things haven't stabilized yet. */ | |
1334 | new_pid = my_waitpid (pid, &status, 0); | |
1335 | if (new_pid == -1 && errno == ECHILD) | |
1336 | { | |
1337 | if (first) | |
1338 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1339 | ||
1340 | /* Try again with __WCLONE to check cloned processes. */ | |
1341 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1342 | *cloned = 1; | |
1343 | } | |
1344 | ||
dacc9cb2 PP |
1345 | gdb_assert (pid == new_pid); |
1346 | ||
1347 | if (!WIFSTOPPED (status)) | |
1348 | { | |
1349 | /* The pid we tried to attach has apparently just exited. */ | |
1350 | if (debug_linux_nat) | |
1351 | fprintf_unfiltered (gdb_stdlog, "LNPAW: Failed to stop %d: %s", | |
1352 | pid, status_to_str (status)); | |
1353 | return status; | |
1354 | } | |
a0ef4274 DJ |
1355 | |
1356 | if (WSTOPSIG (status) != SIGSTOP) | |
1357 | { | |
1358 | *signalled = 1; | |
1359 | if (debug_linux_nat) | |
1360 | fprintf_unfiltered (gdb_stdlog, | |
1361 | "LNPAW: Received %s after attaching\n", | |
1362 | status_to_str (status)); | |
1363 | } | |
1364 | ||
1365 | return status; | |
1366 | } | |
1367 | ||
84636d28 PA |
1368 | /* Attach to the LWP specified by PID. Return 0 if successful, -1 if |
1369 | the new LWP could not be attached, or 1 if we're already auto | |
1370 | attached to this thread, but haven't processed the | |
1371 | PTRACE_EVENT_CLONE event of its parent thread, so we just ignore | |
1372 | its existance, without considering it an error. */ | |
d6b0e80f | 1373 | |
9ee57c33 | 1374 | int |
93815fbf | 1375 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1376 | { |
9ee57c33 | 1377 | struct lwp_info *lp; |
7feb7d06 | 1378 | sigset_t prev_mask; |
84636d28 | 1379 | int lwpid; |
d6b0e80f AC |
1380 | |
1381 | gdb_assert (is_lwp (ptid)); | |
1382 | ||
7feb7d06 | 1383 | block_child_signals (&prev_mask); |
d6b0e80f | 1384 | |
9ee57c33 | 1385 | lp = find_lwp_pid (ptid); |
84636d28 | 1386 | lwpid = GET_LWP (ptid); |
d6b0e80f AC |
1387 | |
1388 | /* We assume that we're already attached to any LWP that has an id | |
1389 | equal to the overall process id, and to any LWP that is already | |
1390 | in our list of LWPs. If we're not seeing exit events from threads | |
1391 | and we've had PID wraparound since we last tried to stop all threads, | |
1392 | this assumption might be wrong; fortunately, this is very unlikely | |
1393 | to happen. */ | |
84636d28 | 1394 | if (lwpid != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1395 | { |
a0ef4274 | 1396 | int status, cloned = 0, signalled = 0; |
d6b0e80f | 1397 | |
84636d28 | 1398 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) < 0) |
9ee57c33 | 1399 | { |
84636d28 PA |
1400 | if (linux_supports_tracefork_flag) |
1401 | { | |
1402 | /* If we haven't stopped all threads when we get here, | |
1403 | we may have seen a thread listed in thread_db's list, | |
1404 | but not processed the PTRACE_EVENT_CLONE yet. If | |
1405 | that's the case, ignore this new thread, and let | |
1406 | normal event handling discover it later. */ | |
1407 | if (in_pid_list_p (stopped_pids, lwpid)) | |
1408 | { | |
1409 | /* We've already seen this thread stop, but we | |
1410 | haven't seen the PTRACE_EVENT_CLONE extended | |
1411 | event yet. */ | |
1412 | restore_child_signals_mask (&prev_mask); | |
1413 | return 0; | |
1414 | } | |
1415 | else | |
1416 | { | |
1417 | int new_pid; | |
1418 | int status; | |
1419 | ||
1420 | /* See if we've got a stop for this new child | |
1421 | pending. If so, we're already attached. */ | |
1422 | new_pid = my_waitpid (lwpid, &status, WNOHANG); | |
1423 | if (new_pid == -1 && errno == ECHILD) | |
1424 | new_pid = my_waitpid (lwpid, &status, __WCLONE | WNOHANG); | |
1425 | if (new_pid != -1) | |
1426 | { | |
1427 | if (WIFSTOPPED (status)) | |
1428 | add_to_pid_list (&stopped_pids, lwpid, status); | |
1429 | ||
1430 | restore_child_signals_mask (&prev_mask); | |
1431 | return 1; | |
1432 | } | |
1433 | } | |
1434 | } | |
1435 | ||
9ee57c33 DJ |
1436 | /* If we fail to attach to the thread, issue a warning, |
1437 | but continue. One way this can happen is if thread | |
e9efe249 | 1438 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1439 | bug may place threads in the thread list and then fail |
1440 | to create them. */ | |
1441 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1442 | safe_strerror (errno)); | |
7feb7d06 | 1443 | restore_child_signals_mask (&prev_mask); |
9ee57c33 DJ |
1444 | return -1; |
1445 | } | |
1446 | ||
d6b0e80f AC |
1447 | if (debug_linux_nat) |
1448 | fprintf_unfiltered (gdb_stdlog, | |
1449 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1450 | target_pid_to_str (ptid)); | |
1451 | ||
a0ef4274 | 1452 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
dacc9cb2 | 1453 | if (!WIFSTOPPED (status)) |
673c2bbe DE |
1454 | { |
1455 | restore_child_signals_mask (&prev_mask); | |
f687d035 | 1456 | return 1; |
673c2bbe | 1457 | } |
dacc9cb2 | 1458 | |
a0ef4274 DJ |
1459 | lp = add_lwp (ptid); |
1460 | lp->stopped = 1; | |
1461 | lp->cloned = cloned; | |
1462 | lp->signalled = signalled; | |
1463 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1464 | { |
a0ef4274 DJ |
1465 | lp->resumed = 1; |
1466 | lp->status = status; | |
d6b0e80f AC |
1467 | } |
1468 | ||
a0ef4274 | 1469 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1470 | |
1471 | if (debug_linux_nat) | |
1472 | { | |
1473 | fprintf_unfiltered (gdb_stdlog, | |
1474 | "LLAL: waitpid %s received %s\n", | |
1475 | target_pid_to_str (ptid), | |
1476 | status_to_str (status)); | |
1477 | } | |
1478 | } | |
1479 | else | |
1480 | { | |
1481 | /* We assume that the LWP representing the original process is | |
1482 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1483 | that the GNU/linux ptrace layer uses to keep track of |
1484 | threads. Note that this won't have already been done since | |
1485 | the main thread will have, we assume, been stopped by an | |
1486 | attach from a different layer. */ | |
9ee57c33 DJ |
1487 | if (lp == NULL) |
1488 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1489 | lp->stopped = 1; |
1490 | } | |
9ee57c33 | 1491 | |
25289eb2 | 1492 | lp->last_resume_kind = resume_stop; |
7feb7d06 | 1493 | restore_child_signals_mask (&prev_mask); |
9ee57c33 | 1494 | return 0; |
d6b0e80f AC |
1495 | } |
1496 | ||
b84876c2 | 1497 | static void |
136d6dae VP |
1498 | linux_nat_create_inferior (struct target_ops *ops, |
1499 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1500 | int from_tty) |
1501 | { | |
10568435 JK |
1502 | #ifdef HAVE_PERSONALITY |
1503 | int personality_orig = 0, personality_set = 0; | |
1504 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1505 | |
1506 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1507 | we have to mask the async mode. */ | |
1508 | ||
10568435 JK |
1509 | #ifdef HAVE_PERSONALITY |
1510 | if (disable_randomization) | |
1511 | { | |
1512 | errno = 0; | |
1513 | personality_orig = personality (0xffffffff); | |
1514 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1515 | { | |
1516 | personality_set = 1; | |
1517 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1518 | } | |
1519 | if (errno != 0 || (personality_set | |
1520 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1521 | warning (_("Error disabling address space randomization: %s"), | |
1522 | safe_strerror (errno)); | |
1523 | } | |
1524 | #endif /* HAVE_PERSONALITY */ | |
1525 | ||
2455069d UW |
1526 | /* Make sure we report all signals during startup. */ |
1527 | linux_nat_pass_signals (0, NULL); | |
1528 | ||
136d6dae | 1529 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1530 | |
10568435 JK |
1531 | #ifdef HAVE_PERSONALITY |
1532 | if (personality_set) | |
1533 | { | |
1534 | errno = 0; | |
1535 | personality (personality_orig); | |
1536 | if (errno != 0) | |
1537 | warning (_("Error restoring address space randomization: %s"), | |
1538 | safe_strerror (errno)); | |
1539 | } | |
1540 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1541 | } |
1542 | ||
d6b0e80f | 1543 | static void |
136d6dae | 1544 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1545 | { |
1546 | struct lwp_info *lp; | |
d6b0e80f | 1547 | int status; |
af990527 | 1548 | ptid_t ptid; |
d6b0e80f | 1549 | |
2455069d UW |
1550 | /* Make sure we report all signals during attach. */ |
1551 | linux_nat_pass_signals (0, NULL); | |
1552 | ||
136d6dae | 1553 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1554 | |
af990527 PA |
1555 | /* The ptrace base target adds the main thread with (pid,0,0) |
1556 | format. Decorate it with lwp info. */ | |
1557 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1558 | thread_change_ptid (inferior_ptid, ptid); | |
1559 | ||
9f0bdab8 | 1560 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1561 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1562 | |
1563 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1564 | &lp->signalled); | |
dacc9cb2 PP |
1565 | if (!WIFSTOPPED (status)) |
1566 | { | |
1567 | if (WIFEXITED (status)) | |
1568 | { | |
1569 | int exit_code = WEXITSTATUS (status); | |
1570 | ||
1571 | target_terminal_ours (); | |
1572 | target_mourn_inferior (); | |
1573 | if (exit_code == 0) | |
1574 | error (_("Unable to attach: program exited normally.")); | |
1575 | else | |
1576 | error (_("Unable to attach: program exited with code %d."), | |
1577 | exit_code); | |
1578 | } | |
1579 | else if (WIFSIGNALED (status)) | |
1580 | { | |
1581 | enum target_signal signo; | |
1582 | ||
1583 | target_terminal_ours (); | |
1584 | target_mourn_inferior (); | |
1585 | ||
1586 | signo = target_signal_from_host (WTERMSIG (status)); | |
1587 | error (_("Unable to attach: program terminated with signal " | |
1588 | "%s, %s."), | |
1589 | target_signal_to_name (signo), | |
1590 | target_signal_to_string (signo)); | |
1591 | } | |
1592 | ||
1593 | internal_error (__FILE__, __LINE__, | |
1594 | _("unexpected status %d for PID %ld"), | |
1595 | status, (long) GET_LWP (ptid)); | |
1596 | } | |
1597 | ||
a0ef4274 | 1598 | lp->stopped = 1; |
9f0bdab8 | 1599 | |
a0ef4274 | 1600 | /* Save the wait status to report later. */ |
d6b0e80f | 1601 | lp->resumed = 1; |
a0ef4274 DJ |
1602 | if (debug_linux_nat) |
1603 | fprintf_unfiltered (gdb_stdlog, | |
1604 | "LNA: waitpid %ld, saving status %s\n", | |
1605 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd | 1606 | |
7feb7d06 PA |
1607 | lp->status = status; |
1608 | ||
1609 | if (target_can_async_p ()) | |
1610 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1611 | } |
1612 | ||
a0ef4274 DJ |
1613 | /* Get pending status of LP. */ |
1614 | static int | |
1615 | get_pending_status (struct lwp_info *lp, int *status) | |
1616 | { | |
ca2163eb PA |
1617 | enum target_signal signo = TARGET_SIGNAL_0; |
1618 | ||
1619 | /* If we paused threads momentarily, we may have stored pending | |
1620 | events in lp->status or lp->waitstatus (see stop_wait_callback), | |
1621 | and GDB core hasn't seen any signal for those threads. | |
1622 | Otherwise, the last signal reported to the core is found in the | |
1623 | thread object's stop_signal. | |
1624 | ||
1625 | There's a corner case that isn't handled here at present. Only | |
1626 | if the thread stopped with a TARGET_WAITKIND_STOPPED does | |
1627 | stop_signal make sense as a real signal to pass to the inferior. | |
1628 | Some catchpoint related events, like | |
1629 | TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set | |
1630 | to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But, | |
1631 | those traps are debug API (ptrace in our case) related and | |
1632 | induced; the inferior wouldn't see them if it wasn't being | |
1633 | traced. Hence, we should never pass them to the inferior, even | |
1634 | when set to pass state. Since this corner case isn't handled by | |
1635 | infrun.c when proceeding with a signal, for consistency, neither | |
1636 | do we handle it here (or elsewhere in the file we check for | |
1637 | signal pass state). Normally SIGTRAP isn't set to pass state, so | |
1638 | this is really a corner case. */ | |
1639 | ||
1640 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
1641 | signo = TARGET_SIGNAL_0; /* a pending ptrace event, not a real signal. */ | |
1642 | else if (lp->status) | |
1643 | signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1644 | else if (non_stop && !is_executing (lp->ptid)) | |
1645 | { | |
1646 | struct thread_info *tp = find_thread_ptid (lp->ptid); | |
e0881a8e | 1647 | |
16c381f0 | 1648 | signo = tp->suspend.stop_signal; |
ca2163eb PA |
1649 | } |
1650 | else if (!non_stop) | |
a0ef4274 | 1651 | { |
ca2163eb PA |
1652 | struct target_waitstatus last; |
1653 | ptid_t last_ptid; | |
4c28f408 | 1654 | |
ca2163eb | 1655 | get_last_target_status (&last_ptid, &last); |
4c28f408 | 1656 | |
ca2163eb PA |
1657 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) |
1658 | { | |
e09875d4 | 1659 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
e0881a8e | 1660 | |
16c381f0 | 1661 | signo = tp->suspend.stop_signal; |
4c28f408 | 1662 | } |
ca2163eb | 1663 | } |
4c28f408 | 1664 | |
ca2163eb | 1665 | *status = 0; |
4c28f408 | 1666 | |
ca2163eb PA |
1667 | if (signo == TARGET_SIGNAL_0) |
1668 | { | |
1669 | if (debug_linux_nat) | |
1670 | fprintf_unfiltered (gdb_stdlog, | |
1671 | "GPT: lwp %s has no pending signal\n", | |
1672 | target_pid_to_str (lp->ptid)); | |
1673 | } | |
1674 | else if (!signal_pass_state (signo)) | |
1675 | { | |
1676 | if (debug_linux_nat) | |
3e43a32a MS |
1677 | fprintf_unfiltered (gdb_stdlog, |
1678 | "GPT: lwp %s had signal %s, " | |
1679 | "but it is in no pass state\n", | |
ca2163eb PA |
1680 | target_pid_to_str (lp->ptid), |
1681 | target_signal_to_string (signo)); | |
a0ef4274 | 1682 | } |
a0ef4274 | 1683 | else |
4c28f408 | 1684 | { |
ca2163eb PA |
1685 | *status = W_STOPCODE (target_signal_to_host (signo)); |
1686 | ||
1687 | if (debug_linux_nat) | |
1688 | fprintf_unfiltered (gdb_stdlog, | |
1689 | "GPT: lwp %s has pending signal %s\n", | |
1690 | target_pid_to_str (lp->ptid), | |
1691 | target_signal_to_string (signo)); | |
4c28f408 | 1692 | } |
a0ef4274 DJ |
1693 | |
1694 | return 0; | |
1695 | } | |
1696 | ||
d6b0e80f AC |
1697 | static int |
1698 | detach_callback (struct lwp_info *lp, void *data) | |
1699 | { | |
1700 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1701 | ||
1702 | if (debug_linux_nat && lp->status) | |
1703 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1704 | strsignal (WSTOPSIG (lp->status)), | |
1705 | target_pid_to_str (lp->ptid)); | |
1706 | ||
a0ef4274 DJ |
1707 | /* If there is a pending SIGSTOP, get rid of it. */ |
1708 | if (lp->signalled) | |
d6b0e80f | 1709 | { |
d6b0e80f AC |
1710 | if (debug_linux_nat) |
1711 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1712 | "DC: Sending SIGCONT to %s\n", |
1713 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1714 | |
a0ef4274 | 1715 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1716 | lp->signalled = 0; |
d6b0e80f AC |
1717 | } |
1718 | ||
1719 | /* We don't actually detach from the LWP that has an id equal to the | |
1720 | overall process id just yet. */ | |
1721 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1722 | { | |
a0ef4274 DJ |
1723 | int status = 0; |
1724 | ||
1725 | /* Pass on any pending signal for this LWP. */ | |
1726 | get_pending_status (lp, &status); | |
1727 | ||
d6b0e80f AC |
1728 | errno = 0; |
1729 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1730 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1731 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1732 | safe_strerror (errno)); |
1733 | ||
1734 | if (debug_linux_nat) | |
1735 | fprintf_unfiltered (gdb_stdlog, | |
1736 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1737 | target_pid_to_str (lp->ptid), | |
7feb7d06 | 1738 | strsignal (WSTOPSIG (status))); |
d6b0e80f AC |
1739 | |
1740 | delete_lwp (lp->ptid); | |
1741 | } | |
1742 | ||
1743 | return 0; | |
1744 | } | |
1745 | ||
1746 | static void | |
136d6dae | 1747 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1748 | { |
b84876c2 | 1749 | int pid; |
a0ef4274 | 1750 | int status; |
d90e17a7 PA |
1751 | struct lwp_info *main_lwp; |
1752 | ||
1753 | pid = GET_PID (inferior_ptid); | |
a0ef4274 | 1754 | |
b84876c2 PA |
1755 | if (target_can_async_p ()) |
1756 | linux_nat_async (NULL, 0); | |
1757 | ||
4c28f408 PA |
1758 | /* Stop all threads before detaching. ptrace requires that the |
1759 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1760 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1761 | /* ... and wait until all of them have reported back that |
1762 | they're no longer running. */ | |
d90e17a7 | 1763 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1764 | |
d90e17a7 | 1765 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1766 | |
1767 | /* Only the initial process should be left right now. */ | |
d90e17a7 PA |
1768 | gdb_assert (num_lwps (GET_PID (inferior_ptid)) == 1); |
1769 | ||
1770 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1771 | |
a0ef4274 DJ |
1772 | /* Pass on any pending signal for the last LWP. */ |
1773 | if ((args == NULL || *args == '\0') | |
d90e17a7 | 1774 | && get_pending_status (main_lwp, &status) != -1 |
a0ef4274 DJ |
1775 | && WIFSTOPPED (status)) |
1776 | { | |
1777 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1778 | pass it along with PTRACE_DETACH. */ | |
1779 | args = alloca (8); | |
1780 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
ddabfc73 TT |
1781 | if (debug_linux_nat) |
1782 | fprintf_unfiltered (gdb_stdlog, | |
1783 | "LND: Sending signal %s to %s\n", | |
1784 | args, | |
1785 | target_pid_to_str (main_lwp->ptid)); | |
a0ef4274 DJ |
1786 | } |
1787 | ||
d90e17a7 | 1788 | delete_lwp (main_lwp->ptid); |
b84876c2 | 1789 | |
7a7d3353 PA |
1790 | if (forks_exist_p ()) |
1791 | { | |
1792 | /* Multi-fork case. The current inferior_ptid is being detached | |
1793 | from, but there are other viable forks to debug. Detach from | |
1794 | the current fork, and context-switch to the first | |
1795 | available. */ | |
1796 | linux_fork_detach (args, from_tty); | |
1797 | ||
1798 | if (non_stop && target_can_async_p ()) | |
1799 | target_async (inferior_event_handler, 0); | |
1800 | } | |
1801 | else | |
1802 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1803 | } |
1804 | ||
1805 | /* Resume LP. */ | |
1806 | ||
25289eb2 PA |
1807 | static void |
1808 | resume_lwp (struct lwp_info *lp, int step) | |
d6b0e80f | 1809 | { |
25289eb2 | 1810 | if (lp->stopped) |
6c95b8df | 1811 | { |
25289eb2 PA |
1812 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
1813 | ||
1814 | if (inf->vfork_child != NULL) | |
1815 | { | |
1816 | if (debug_linux_nat) | |
1817 | fprintf_unfiltered (gdb_stdlog, | |
1818 | "RC: Not resuming %s (vfork parent)\n", | |
1819 | target_pid_to_str (lp->ptid)); | |
1820 | } | |
1821 | else if (lp->status == 0 | |
1822 | && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) | |
1823 | { | |
1824 | if (debug_linux_nat) | |
1825 | fprintf_unfiltered (gdb_stdlog, | |
1826 | "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n", | |
1827 | target_pid_to_str (lp->ptid)); | |
1828 | ||
1829 | linux_ops->to_resume (linux_ops, | |
1830 | pid_to_ptid (GET_LWP (lp->ptid)), | |
1831 | step, TARGET_SIGNAL_0); | |
25289eb2 PA |
1832 | lp->stopped = 0; |
1833 | lp->step = step; | |
1834 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
1835 | lp->stopped_by_watchpoint = 0; | |
1836 | } | |
1837 | else | |
1838 | { | |
1839 | if (debug_linux_nat) | |
1840 | fprintf_unfiltered (gdb_stdlog, | |
1841 | "RC: Not resuming sibling %s (has pending)\n", | |
1842 | target_pid_to_str (lp->ptid)); | |
1843 | } | |
6c95b8df | 1844 | } |
25289eb2 | 1845 | else |
d6b0e80f | 1846 | { |
d90e17a7 PA |
1847 | if (debug_linux_nat) |
1848 | fprintf_unfiltered (gdb_stdlog, | |
25289eb2 | 1849 | "RC: Not resuming sibling %s (not stopped)\n", |
d6b0e80f | 1850 | target_pid_to_str (lp->ptid)); |
d6b0e80f | 1851 | } |
25289eb2 | 1852 | } |
d6b0e80f | 1853 | |
25289eb2 PA |
1854 | static int |
1855 | resume_callback (struct lwp_info *lp, void *data) | |
1856 | { | |
1857 | resume_lwp (lp, 0); | |
d6b0e80f AC |
1858 | return 0; |
1859 | } | |
1860 | ||
1861 | static int | |
1862 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1863 | { | |
1864 | lp->resumed = 0; | |
25289eb2 | 1865 | lp->last_resume_kind = resume_stop; |
d6b0e80f AC |
1866 | return 0; |
1867 | } | |
1868 | ||
1869 | static int | |
1870 | resume_set_callback (struct lwp_info *lp, void *data) | |
1871 | { | |
1872 | lp->resumed = 1; | |
25289eb2 | 1873 | lp->last_resume_kind = resume_continue; |
d6b0e80f AC |
1874 | return 0; |
1875 | } | |
1876 | ||
1877 | static void | |
28439f5e PA |
1878 | linux_nat_resume (struct target_ops *ops, |
1879 | ptid_t ptid, int step, enum target_signal signo) | |
d6b0e80f | 1880 | { |
7feb7d06 | 1881 | sigset_t prev_mask; |
d6b0e80f | 1882 | struct lwp_info *lp; |
d90e17a7 | 1883 | int resume_many; |
d6b0e80f | 1884 | |
76f50ad1 DJ |
1885 | if (debug_linux_nat) |
1886 | fprintf_unfiltered (gdb_stdlog, | |
1887 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1888 | step ? "step" : "resume", | |
1889 | target_pid_to_str (ptid), | |
423ec54c JK |
1890 | (signo != TARGET_SIGNAL_0 |
1891 | ? strsignal (target_signal_to_host (signo)) : "0"), | |
76f50ad1 DJ |
1892 | target_pid_to_str (inferior_ptid)); |
1893 | ||
7feb7d06 | 1894 | block_child_signals (&prev_mask); |
b84876c2 | 1895 | |
d6b0e80f | 1896 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1897 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1898 | || ptid_is_pid (ptid)); | |
4c28f408 | 1899 | |
e3e9f5a2 PA |
1900 | /* Mark the lwps we're resuming as resumed. */ |
1901 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
d6b0e80f | 1902 | |
d90e17a7 PA |
1903 | /* See if it's the current inferior that should be handled |
1904 | specially. */ | |
1905 | if (resume_many) | |
1906 | lp = find_lwp_pid (inferior_ptid); | |
1907 | else | |
1908 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1909 | gdb_assert (lp != NULL); |
d6b0e80f | 1910 | |
9f0bdab8 DJ |
1911 | /* Remember if we're stepping. */ |
1912 | lp->step = step; | |
25289eb2 | 1913 | lp->last_resume_kind = step ? resume_step : resume_continue; |
d6b0e80f | 1914 | |
9f0bdab8 DJ |
1915 | /* If we have a pending wait status for this thread, there is no |
1916 | point in resuming the process. But first make sure that | |
1917 | linux_nat_wait won't preemptively handle the event - we | |
1918 | should never take this short-circuit if we are going to | |
1919 | leave LP running, since we have skipped resuming all the | |
1920 | other threads. This bit of code needs to be synchronized | |
1921 | with linux_nat_wait. */ | |
76f50ad1 | 1922 | |
9f0bdab8 DJ |
1923 | if (lp->status && WIFSTOPPED (lp->status)) |
1924 | { | |
2455069d UW |
1925 | if (!lp->step |
1926 | && WSTOPSIG (lp->status) | |
1927 | && sigismember (&pass_mask, WSTOPSIG (lp->status))) | |
d6b0e80f | 1928 | { |
9f0bdab8 DJ |
1929 | if (debug_linux_nat) |
1930 | fprintf_unfiltered (gdb_stdlog, | |
1931 | "LLR: Not short circuiting for ignored " | |
1932 | "status 0x%x\n", lp->status); | |
1933 | ||
d6b0e80f AC |
1934 | /* FIXME: What should we do if we are supposed to continue |
1935 | this thread with a signal? */ | |
1936 | gdb_assert (signo == TARGET_SIGNAL_0); | |
2455069d | 1937 | signo = target_signal_from_host (WSTOPSIG (lp->status)); |
9f0bdab8 DJ |
1938 | lp->status = 0; |
1939 | } | |
1940 | } | |
76f50ad1 | 1941 | |
6c95b8df | 1942 | if (lp->status || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
9f0bdab8 DJ |
1943 | { |
1944 | /* FIXME: What should we do if we are supposed to continue | |
1945 | this thread with a signal? */ | |
1946 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1947 | |
9f0bdab8 DJ |
1948 | if (debug_linux_nat) |
1949 | fprintf_unfiltered (gdb_stdlog, | |
1950 | "LLR: Short circuiting for status 0x%x\n", | |
1951 | lp->status); | |
d6b0e80f | 1952 | |
7feb7d06 PA |
1953 | restore_child_signals_mask (&prev_mask); |
1954 | if (target_can_async_p ()) | |
1955 | { | |
1956 | target_async (inferior_event_handler, 0); | |
1957 | /* Tell the event loop we have something to process. */ | |
1958 | async_file_mark (); | |
1959 | } | |
9f0bdab8 | 1960 | return; |
d6b0e80f AC |
1961 | } |
1962 | ||
9f0bdab8 DJ |
1963 | /* Mark LWP as not stopped to prevent it from being continued by |
1964 | resume_callback. */ | |
1965 | lp->stopped = 0; | |
1966 | ||
d90e17a7 PA |
1967 | if (resume_many) |
1968 | iterate_over_lwps (ptid, resume_callback, NULL); | |
1969 | ||
1970 | /* Convert to something the lower layer understands. */ | |
1971 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
d6b0e80f | 1972 | |
28439f5e | 1973 | linux_ops->to_resume (linux_ops, ptid, step, signo); |
9f0bdab8 | 1974 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
ebec9a0f | 1975 | lp->stopped_by_watchpoint = 0; |
9f0bdab8 | 1976 | |
d6b0e80f AC |
1977 | if (debug_linux_nat) |
1978 | fprintf_unfiltered (gdb_stdlog, | |
1979 | "LLR: %s %s, %s (resume event thread)\n", | |
1980 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1981 | target_pid_to_str (ptid), | |
423ec54c JK |
1982 | (signo != TARGET_SIGNAL_0 |
1983 | ? strsignal (target_signal_to_host (signo)) : "0")); | |
b84876c2 | 1984 | |
7feb7d06 | 1985 | restore_child_signals_mask (&prev_mask); |
b84876c2 | 1986 | if (target_can_async_p ()) |
8ea051c5 | 1987 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
1988 | } |
1989 | ||
c5f62d5f | 1990 | /* Send a signal to an LWP. */ |
d6b0e80f AC |
1991 | |
1992 | static int | |
1993 | kill_lwp (int lwpid, int signo) | |
1994 | { | |
c5f62d5f DE |
1995 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
1996 | fails, then we are not using nptl threads and we should be using kill. */ | |
d6b0e80f AC |
1997 | |
1998 | #ifdef HAVE_TKILL_SYSCALL | |
c5f62d5f DE |
1999 | { |
2000 | static int tkill_failed; | |
2001 | ||
2002 | if (!tkill_failed) | |
2003 | { | |
2004 | int ret; | |
2005 | ||
2006 | errno = 0; | |
2007 | ret = syscall (__NR_tkill, lwpid, signo); | |
2008 | if (errno != ENOSYS) | |
2009 | return ret; | |
2010 | tkill_failed = 1; | |
2011 | } | |
2012 | } | |
d6b0e80f AC |
2013 | #endif |
2014 | ||
2015 | return kill (lwpid, signo); | |
2016 | } | |
2017 | ||
ca2163eb PA |
2018 | /* Handle a GNU/Linux syscall trap wait response. If we see a syscall |
2019 | event, check if the core is interested in it: if not, ignore the | |
2020 | event, and keep waiting; otherwise, we need to toggle the LWP's | |
2021 | syscall entry/exit status, since the ptrace event itself doesn't | |
2022 | indicate it, and report the trap to higher layers. */ | |
2023 | ||
2024 | static int | |
2025 | linux_handle_syscall_trap (struct lwp_info *lp, int stopping) | |
2026 | { | |
2027 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
2028 | struct gdbarch *gdbarch = target_thread_architecture (lp->ptid); | |
2029 | int syscall_number = (int) gdbarch_get_syscall_number (gdbarch, lp->ptid); | |
2030 | ||
2031 | if (stopping) | |
2032 | { | |
2033 | /* If we're stopping threads, there's a SIGSTOP pending, which | |
2034 | makes it so that the LWP reports an immediate syscall return, | |
2035 | followed by the SIGSTOP. Skip seeing that "return" using | |
2036 | PTRACE_CONT directly, and let stop_wait_callback collect the | |
2037 | SIGSTOP. Later when the thread is resumed, a new syscall | |
2038 | entry event. If we didn't do this (and returned 0), we'd | |
2039 | leave a syscall entry pending, and our caller, by using | |
2040 | PTRACE_CONT to collect the SIGSTOP, skips the syscall return | |
2041 | itself. Later, when the user re-resumes this LWP, we'd see | |
2042 | another syscall entry event and we'd mistake it for a return. | |
2043 | ||
2044 | If stop_wait_callback didn't force the SIGSTOP out of the LWP | |
2045 | (leaving immediately with LWP->signalled set, without issuing | |
2046 | a PTRACE_CONT), it would still be problematic to leave this | |
2047 | syscall enter pending, as later when the thread is resumed, | |
2048 | it would then see the same syscall exit mentioned above, | |
2049 | followed by the delayed SIGSTOP, while the syscall didn't | |
2050 | actually get to execute. It seems it would be even more | |
2051 | confusing to the user. */ | |
2052 | ||
2053 | if (debug_linux_nat) | |
2054 | fprintf_unfiltered (gdb_stdlog, | |
2055 | "LHST: ignoring syscall %d " | |
2056 | "for LWP %ld (stopping threads), " | |
2057 | "resuming with PTRACE_CONT for SIGSTOP\n", | |
2058 | syscall_number, | |
2059 | GET_LWP (lp->ptid)); | |
2060 | ||
2061 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2062 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2063 | return 1; | |
2064 | } | |
2065 | ||
2066 | if (catch_syscall_enabled ()) | |
2067 | { | |
2068 | /* Always update the entry/return state, even if this particular | |
2069 | syscall isn't interesting to the core now. In async mode, | |
2070 | the user could install a new catchpoint for this syscall | |
2071 | between syscall enter/return, and we'll need to know to | |
2072 | report a syscall return if that happens. */ | |
2073 | lp->syscall_state = (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2074 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2075 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2076 | ||
2077 | if (catching_syscall_number (syscall_number)) | |
2078 | { | |
2079 | /* Alright, an event to report. */ | |
2080 | ourstatus->kind = lp->syscall_state; | |
2081 | ourstatus->value.syscall_number = syscall_number; | |
2082 | ||
2083 | if (debug_linux_nat) | |
2084 | fprintf_unfiltered (gdb_stdlog, | |
2085 | "LHST: stopping for %s of syscall %d" | |
2086 | " for LWP %ld\n", | |
3e43a32a MS |
2087 | lp->syscall_state |
2088 | == TARGET_WAITKIND_SYSCALL_ENTRY | |
ca2163eb PA |
2089 | ? "entry" : "return", |
2090 | syscall_number, | |
2091 | GET_LWP (lp->ptid)); | |
2092 | return 0; | |
2093 | } | |
2094 | ||
2095 | if (debug_linux_nat) | |
2096 | fprintf_unfiltered (gdb_stdlog, | |
2097 | "LHST: ignoring %s of syscall %d " | |
2098 | "for LWP %ld\n", | |
2099 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2100 | ? "entry" : "return", | |
2101 | syscall_number, | |
2102 | GET_LWP (lp->ptid)); | |
2103 | } | |
2104 | else | |
2105 | { | |
2106 | /* If we had been syscall tracing, and hence used PT_SYSCALL | |
2107 | before on this LWP, it could happen that the user removes all | |
2108 | syscall catchpoints before we get to process this event. | |
2109 | There are two noteworthy issues here: | |
2110 | ||
2111 | - When stopped at a syscall entry event, resuming with | |
2112 | PT_STEP still resumes executing the syscall and reports a | |
2113 | syscall return. | |
2114 | ||
2115 | - Only PT_SYSCALL catches syscall enters. If we last | |
2116 | single-stepped this thread, then this event can't be a | |
2117 | syscall enter. If we last single-stepped this thread, this | |
2118 | has to be a syscall exit. | |
2119 | ||
2120 | The points above mean that the next resume, be it PT_STEP or | |
2121 | PT_CONTINUE, can not trigger a syscall trace event. */ | |
2122 | if (debug_linux_nat) | |
2123 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2124 | "LHST: caught syscall event " |
2125 | "with no syscall catchpoints." | |
ca2163eb PA |
2126 | " %d for LWP %ld, ignoring\n", |
2127 | syscall_number, | |
2128 | GET_LWP (lp->ptid)); | |
2129 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2130 | } | |
2131 | ||
2132 | /* The core isn't interested in this event. For efficiency, avoid | |
2133 | stopping all threads only to have the core resume them all again. | |
2134 | Since we're not stopping threads, if we're still syscall tracing | |
2135 | and not stepping, we can't use PTRACE_CONT here, as we'd miss any | |
2136 | subsequent syscall. Simply resume using the inf-ptrace layer, | |
2137 | which knows when to use PT_SYSCALL or PT_CONTINUE. */ | |
2138 | ||
2139 | /* Note that gdbarch_get_syscall_number may access registers, hence | |
2140 | fill a regcache. */ | |
2141 | registers_changed (); | |
2142 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
2143 | lp->step, TARGET_SIGNAL_0); | |
2144 | return 1; | |
2145 | } | |
2146 | ||
3d799a95 DJ |
2147 | /* Handle a GNU/Linux extended wait response. If we see a clone |
2148 | event, we need to add the new LWP to our list (and not report the | |
2149 | trap to higher layers). This function returns non-zero if the | |
2150 | event should be ignored and we should wait again. If STOPPING is | |
2151 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
2152 | |
2153 | static int | |
3d799a95 DJ |
2154 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
2155 | int stopping) | |
d6b0e80f | 2156 | { |
3d799a95 DJ |
2157 | int pid = GET_LWP (lp->ptid); |
2158 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
3d799a95 | 2159 | int event = status >> 16; |
d6b0e80f | 2160 | |
3d799a95 DJ |
2161 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
2162 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 2163 | { |
3d799a95 DJ |
2164 | unsigned long new_pid; |
2165 | int ret; | |
2166 | ||
2167 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 2168 | |
3d799a95 DJ |
2169 | /* If we haven't already seen the new PID stop, wait for it now. */ |
2170 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
2171 | { | |
2172 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
2173 | hits the SIGSTOP, but we're already attached. */ | |
2174 | ret = my_waitpid (new_pid, &status, | |
2175 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
2176 | if (ret == -1) | |
2177 | perror_with_name (_("waiting for new child")); | |
2178 | else if (ret != new_pid) | |
2179 | internal_error (__FILE__, __LINE__, | |
2180 | _("wait returned unexpected PID %d"), ret); | |
2181 | else if (!WIFSTOPPED (status)) | |
2182 | internal_error (__FILE__, __LINE__, | |
2183 | _("wait returned unexpected status 0x%x"), status); | |
2184 | } | |
2185 | ||
3a3e9ee3 | 2186 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 | 2187 | |
2277426b PA |
2188 | if (event == PTRACE_EVENT_FORK |
2189 | && linux_fork_checkpointing_p (GET_PID (lp->ptid))) | |
2190 | { | |
2277426b PA |
2191 | /* Handle checkpointing by linux-fork.c here as a special |
2192 | case. We don't want the follow-fork-mode or 'catch fork' | |
2193 | to interfere with this. */ | |
2194 | ||
2195 | /* This won't actually modify the breakpoint list, but will | |
2196 | physically remove the breakpoints from the child. */ | |
2197 | detach_breakpoints (new_pid); | |
2198 | ||
2199 | /* Retain child fork in ptrace (stopped) state. */ | |
14571dad MS |
2200 | if (!find_fork_pid (new_pid)) |
2201 | add_fork (new_pid); | |
2277426b PA |
2202 | |
2203 | /* Report as spurious, so that infrun doesn't want to follow | |
2204 | this fork. We're actually doing an infcall in | |
2205 | linux-fork.c. */ | |
2206 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
2207 | linux_enable_event_reporting (pid_to_ptid (new_pid)); | |
2208 | ||
2209 | /* Report the stop to the core. */ | |
2210 | return 0; | |
2211 | } | |
2212 | ||
3d799a95 DJ |
2213 | if (event == PTRACE_EVENT_FORK) |
2214 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
2215 | else if (event == PTRACE_EVENT_VFORK) | |
2216 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 2217 | else |
3d799a95 | 2218 | { |
78768c4a JK |
2219 | struct lwp_info *new_lp; |
2220 | ||
3d799a95 | 2221 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
78768c4a | 2222 | |
d90e17a7 | 2223 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (lp->ptid))); |
3d799a95 | 2224 | new_lp->cloned = 1; |
4c28f408 | 2225 | new_lp->stopped = 1; |
d6b0e80f | 2226 | |
3d799a95 DJ |
2227 | if (WSTOPSIG (status) != SIGSTOP) |
2228 | { | |
2229 | /* This can happen if someone starts sending signals to | |
2230 | the new thread before it gets a chance to run, which | |
2231 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
2232 | This is an unlikely case, and harder to handle for | |
2233 | fork / vfork than for clone, so we do not try - but | |
2234 | we handle it for clone events here. We'll send | |
2235 | the other signal on to the thread below. */ | |
2236 | ||
2237 | new_lp->signalled = 1; | |
2238 | } | |
2239 | else | |
2240 | status = 0; | |
d6b0e80f | 2241 | |
4c28f408 | 2242 | if (non_stop) |
3d799a95 | 2243 | { |
4c28f408 PA |
2244 | /* Add the new thread to GDB's lists as soon as possible |
2245 | so that: | |
2246 | ||
2247 | 1) the frontend doesn't have to wait for a stop to | |
2248 | display them, and, | |
2249 | ||
2250 | 2) we tag it with the correct running state. */ | |
2251 | ||
2252 | /* If the thread_db layer is active, let it know about | |
2253 | this new thread, and add it to GDB's list. */ | |
2254 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
2255 | { | |
2256 | /* We're not using thread_db. Add it to GDB's | |
2257 | list. */ | |
2258 | target_post_attach (GET_LWP (new_lp->ptid)); | |
2259 | add_thread (new_lp->ptid); | |
2260 | } | |
2261 | ||
2262 | if (!stopping) | |
2263 | { | |
2264 | set_running (new_lp->ptid, 1); | |
2265 | set_executing (new_lp->ptid, 1); | |
2266 | } | |
2267 | } | |
2268 | ||
ca2163eb PA |
2269 | /* Note the need to use the low target ops to resume, to |
2270 | handle resuming with PT_SYSCALL if we have syscall | |
2271 | catchpoints. */ | |
4c28f408 PA |
2272 | if (!stopping) |
2273 | { | |
423ec54c | 2274 | enum target_signal signo; |
ca2163eb | 2275 | |
4c28f408 | 2276 | new_lp->stopped = 0; |
3d799a95 | 2277 | new_lp->resumed = 1; |
25289eb2 | 2278 | new_lp->last_resume_kind = resume_continue; |
ca2163eb PA |
2279 | |
2280 | signo = (status | |
2281 | ? target_signal_from_host (WSTOPSIG (status)) | |
2282 | : TARGET_SIGNAL_0); | |
2283 | ||
2284 | linux_ops->to_resume (linux_ops, pid_to_ptid (new_pid), | |
2285 | 0, signo); | |
3d799a95 | 2286 | } |
ad34eb2f JK |
2287 | else |
2288 | { | |
2289 | if (status != 0) | |
2290 | { | |
2291 | /* We created NEW_LP so it cannot yet contain STATUS. */ | |
2292 | gdb_assert (new_lp->status == 0); | |
2293 | ||
2294 | /* Save the wait status to report later. */ | |
2295 | if (debug_linux_nat) | |
2296 | fprintf_unfiltered (gdb_stdlog, | |
2297 | "LHEW: waitpid of new LWP %ld, " | |
2298 | "saving status %s\n", | |
2299 | (long) GET_LWP (new_lp->ptid), | |
2300 | status_to_str (status)); | |
2301 | new_lp->status = status; | |
2302 | } | |
2303 | } | |
d6b0e80f | 2304 | |
3d799a95 DJ |
2305 | if (debug_linux_nat) |
2306 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2307 | "LHEW: Got clone event " |
2308 | "from LWP %ld, resuming\n", | |
3d799a95 | 2309 | GET_LWP (lp->ptid)); |
ca2163eb PA |
2310 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
2311 | 0, TARGET_SIGNAL_0); | |
3d799a95 DJ |
2312 | |
2313 | return 1; | |
2314 | } | |
2315 | ||
2316 | return 0; | |
d6b0e80f AC |
2317 | } |
2318 | ||
3d799a95 DJ |
2319 | if (event == PTRACE_EVENT_EXEC) |
2320 | { | |
a75724bc PA |
2321 | if (debug_linux_nat) |
2322 | fprintf_unfiltered (gdb_stdlog, | |
2323 | "LHEW: Got exec event from LWP %ld\n", | |
2324 | GET_LWP (lp->ptid)); | |
2325 | ||
3d799a95 DJ |
2326 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
2327 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 2328 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 | 2329 | |
6c95b8df PA |
2330 | return 0; |
2331 | } | |
2332 | ||
2333 | if (event == PTRACE_EVENT_VFORK_DONE) | |
2334 | { | |
2335 | if (current_inferior ()->waiting_for_vfork_done) | |
3d799a95 | 2336 | { |
6c95b8df | 2337 | if (debug_linux_nat) |
3e43a32a MS |
2338 | fprintf_unfiltered (gdb_stdlog, |
2339 | "LHEW: Got expected PTRACE_EVENT_" | |
2340 | "VFORK_DONE from LWP %ld: stopping\n", | |
6c95b8df | 2341 | GET_LWP (lp->ptid)); |
3d799a95 | 2342 | |
6c95b8df PA |
2343 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; |
2344 | return 0; | |
3d799a95 DJ |
2345 | } |
2346 | ||
6c95b8df | 2347 | if (debug_linux_nat) |
3e43a32a MS |
2348 | fprintf_unfiltered (gdb_stdlog, |
2349 | "LHEW: Got PTRACE_EVENT_VFORK_DONE " | |
2350 | "from LWP %ld: resuming\n", | |
6c95b8df PA |
2351 | GET_LWP (lp->ptid)); |
2352 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2353 | return 1; | |
3d799a95 DJ |
2354 | } |
2355 | ||
2356 | internal_error (__FILE__, __LINE__, | |
2357 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
2358 | } |
2359 | ||
432b4d03 JK |
2360 | /* Return non-zero if LWP is a zombie. */ |
2361 | ||
2362 | static int | |
2363 | linux_lwp_is_zombie (long lwp) | |
2364 | { | |
2365 | char buffer[MAXPATHLEN]; | |
2366 | FILE *procfile; | |
2367 | int retval = 0; | |
2368 | ||
07e78767 | 2369 | xsnprintf (buffer, sizeof (buffer), "/proc/%ld/status", lwp); |
432b4d03 JK |
2370 | procfile = fopen (buffer, "r"); |
2371 | if (procfile == NULL) | |
2372 | { | |
2373 | warning (_("unable to open /proc file '%s'"), buffer); | |
2374 | return 0; | |
2375 | } | |
2376 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) | |
2377 | if (strcmp (buffer, "State:\tZ (zombie)\n") == 0) | |
2378 | { | |
2379 | retval = 1; | |
2380 | break; | |
2381 | } | |
2382 | fclose (procfile); | |
2383 | ||
2384 | return retval; | |
2385 | } | |
2386 | ||
d6b0e80f AC |
2387 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has |
2388 | exited. */ | |
2389 | ||
2390 | static int | |
2391 | wait_lwp (struct lwp_info *lp) | |
2392 | { | |
2393 | pid_t pid; | |
432b4d03 | 2394 | int status = 0; |
d6b0e80f | 2395 | int thread_dead = 0; |
432b4d03 | 2396 | sigset_t prev_mask; |
d6b0e80f AC |
2397 | |
2398 | gdb_assert (!lp->stopped); | |
2399 | gdb_assert (lp->status == 0); | |
2400 | ||
432b4d03 JK |
2401 | /* Make sure SIGCHLD is blocked for sigsuspend avoiding a race below. */ |
2402 | block_child_signals (&prev_mask); | |
2403 | ||
2404 | for (;;) | |
d6b0e80f | 2405 | { |
432b4d03 JK |
2406 | /* If my_waitpid returns 0 it means the __WCLONE vs. non-__WCLONE kind |
2407 | was right and we should just call sigsuspend. */ | |
2408 | ||
2409 | pid = my_waitpid (GET_LWP (lp->ptid), &status, WNOHANG); | |
d6b0e80f | 2410 | if (pid == -1 && errno == ECHILD) |
432b4d03 | 2411 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE | WNOHANG); |
a9f4bb21 PA |
2412 | if (pid == -1 && errno == ECHILD) |
2413 | { | |
2414 | /* The thread has previously exited. We need to delete it | |
2415 | now because, for some vendor 2.4 kernels with NPTL | |
2416 | support backported, there won't be an exit event unless | |
2417 | it is the main thread. 2.6 kernels will report an exit | |
2418 | event for each thread that exits, as expected. */ | |
2419 | thread_dead = 1; | |
2420 | if (debug_linux_nat) | |
2421 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2422 | target_pid_to_str (lp->ptid)); | |
2423 | } | |
432b4d03 JK |
2424 | if (pid != 0) |
2425 | break; | |
2426 | ||
2427 | /* Bugs 10970, 12702. | |
2428 | Thread group leader may have exited in which case we'll lock up in | |
2429 | waitpid if there are other threads, even if they are all zombies too. | |
2430 | Basically, we're not supposed to use waitpid this way. | |
2431 | __WCLONE is not applicable for the leader so we can't use that. | |
2432 | LINUX_NAT_THREAD_ALIVE cannot be used here as it requires a STOPPED | |
2433 | process; it gets ESRCH both for the zombie and for running processes. | |
2434 | ||
2435 | As a workaround, check if we're waiting for the thread group leader and | |
2436 | if it's a zombie, and avoid calling waitpid if it is. | |
2437 | ||
2438 | This is racy, what if the tgl becomes a zombie right after we check? | |
2439 | Therefore always use WNOHANG with sigsuspend - it is equivalent to | |
2440 | waiting waitpid but the linux_lwp_is_zombie is safe this way. */ | |
2441 | ||
2442 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid) | |
2443 | && linux_lwp_is_zombie (GET_LWP (lp->ptid))) | |
d6b0e80f | 2444 | { |
d6b0e80f AC |
2445 | thread_dead = 1; |
2446 | if (debug_linux_nat) | |
432b4d03 JK |
2447 | fprintf_unfiltered (gdb_stdlog, |
2448 | "WL: Thread group leader %s vanished.\n", | |
d6b0e80f | 2449 | target_pid_to_str (lp->ptid)); |
432b4d03 | 2450 | break; |
d6b0e80f | 2451 | } |
432b4d03 JK |
2452 | |
2453 | /* Wait for next SIGCHLD and try again. This may let SIGCHLD handlers | |
2454 | get invoked despite our caller had them intentionally blocked by | |
2455 | block_child_signals. This is sensitive only to the loop of | |
2456 | linux_nat_wait_1 and there if we get called my_waitpid gets called | |
2457 | again before it gets to sigsuspend so we can safely let the handlers | |
2458 | get executed here. */ | |
2459 | ||
2460 | sigsuspend (&suspend_mask); | |
2461 | } | |
2462 | ||
2463 | restore_child_signals_mask (&prev_mask); | |
2464 | ||
d6b0e80f AC |
2465 | if (!thread_dead) |
2466 | { | |
2467 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
2468 | ||
2469 | if (debug_linux_nat) | |
2470 | { | |
2471 | fprintf_unfiltered (gdb_stdlog, | |
2472 | "WL: waitpid %s received %s\n", | |
2473 | target_pid_to_str (lp->ptid), | |
2474 | status_to_str (status)); | |
2475 | } | |
d6b0e80f | 2476 | |
a9f4bb21 PA |
2477 | /* Check if the thread has exited. */ |
2478 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2479 | { | |
2480 | thread_dead = 1; | |
2481 | if (debug_linux_nat) | |
2482 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2483 | target_pid_to_str (lp->ptid)); | |
2484 | } | |
d6b0e80f AC |
2485 | } |
2486 | ||
2487 | if (thread_dead) | |
2488 | { | |
e26af52f | 2489 | exit_lwp (lp); |
d6b0e80f AC |
2490 | return 0; |
2491 | } | |
2492 | ||
2493 | gdb_assert (WIFSTOPPED (status)); | |
2494 | ||
ca2163eb PA |
2495 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
2496 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
2497 | { | |
2498 | /* No longer need the sysgood bit. The ptrace event ends up | |
2499 | recorded in lp->waitstatus if we care for it. We can carry | |
2500 | on handling the event like a regular SIGTRAP from here | |
2501 | on. */ | |
2502 | status = W_STOPCODE (SIGTRAP); | |
2503 | if (linux_handle_syscall_trap (lp, 1)) | |
2504 | return wait_lwp (lp); | |
2505 | } | |
2506 | ||
d6b0e80f AC |
2507 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
2508 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2509 | { | |
2510 | if (debug_linux_nat) | |
2511 | fprintf_unfiltered (gdb_stdlog, | |
2512 | "WL: Handling extended status 0x%06x\n", | |
2513 | status); | |
3d799a95 | 2514 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
2515 | return wait_lwp (lp); |
2516 | } | |
2517 | ||
2518 | return status; | |
2519 | } | |
2520 | ||
9f0bdab8 DJ |
2521 | /* Save the most recent siginfo for LP. This is currently only called |
2522 | for SIGTRAP; some ports use the si_addr field for | |
2523 | target_stopped_data_address. In the future, it may also be used to | |
2524 | restore the siginfo of requeued signals. */ | |
2525 | ||
2526 | static void | |
2527 | save_siginfo (struct lwp_info *lp) | |
2528 | { | |
2529 | errno = 0; | |
2530 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
2531 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
2532 | ||
2533 | if (errno != 0) | |
2534 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
2535 | } | |
2536 | ||
d6b0e80f AC |
2537 | /* Send a SIGSTOP to LP. */ |
2538 | ||
2539 | static int | |
2540 | stop_callback (struct lwp_info *lp, void *data) | |
2541 | { | |
2542 | if (!lp->stopped && !lp->signalled) | |
2543 | { | |
2544 | int ret; | |
2545 | ||
2546 | if (debug_linux_nat) | |
2547 | { | |
2548 | fprintf_unfiltered (gdb_stdlog, | |
2549 | "SC: kill %s **<SIGSTOP>**\n", | |
2550 | target_pid_to_str (lp->ptid)); | |
2551 | } | |
2552 | errno = 0; | |
2553 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
2554 | if (debug_linux_nat) | |
2555 | { | |
2556 | fprintf_unfiltered (gdb_stdlog, | |
2557 | "SC: lwp kill %d %s\n", | |
2558 | ret, | |
2559 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2560 | } | |
2561 | ||
2562 | lp->signalled = 1; | |
2563 | gdb_assert (lp->status == 0); | |
2564 | } | |
2565 | ||
2566 | return 0; | |
2567 | } | |
2568 | ||
57380f4e | 2569 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2570 | |
2571 | static int | |
57380f4e DJ |
2572 | linux_nat_has_pending_sigint (int pid) |
2573 | { | |
2574 | sigset_t pending, blocked, ignored; | |
57380f4e DJ |
2575 | |
2576 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2577 | ||
2578 | if (sigismember (&pending, SIGINT) | |
2579 | && !sigismember (&ignored, SIGINT)) | |
2580 | return 1; | |
2581 | ||
2582 | return 0; | |
2583 | } | |
2584 | ||
2585 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2586 | ||
2587 | static int | |
2588 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2589 | { |
57380f4e DJ |
2590 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2591 | flag to consume the next one. */ | |
2592 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2593 | && WSTOPSIG (lp->status) == SIGINT) | |
2594 | lp->status = 0; | |
2595 | else | |
2596 | lp->ignore_sigint = 1; | |
2597 | ||
2598 | return 0; | |
2599 | } | |
2600 | ||
2601 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2602 | This function is called after we know the LWP has stopped; if the LWP | |
2603 | stopped before the expected SIGINT was delivered, then it will never have | |
2604 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2605 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2606 | |
57380f4e DJ |
2607 | static void |
2608 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2609 | { | |
2610 | if (!lp->ignore_sigint) | |
2611 | return; | |
2612 | ||
2613 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2614 | { | |
2615 | if (debug_linux_nat) | |
2616 | fprintf_unfiltered (gdb_stdlog, | |
2617 | "MCIS: Clearing bogus flag for %s\n", | |
2618 | target_pid_to_str (lp->ptid)); | |
2619 | lp->ignore_sigint = 0; | |
2620 | } | |
2621 | } | |
2622 | ||
ebec9a0f PA |
2623 | /* Fetch the possible triggered data watchpoint info and store it in |
2624 | LP. | |
2625 | ||
2626 | On some archs, like x86, that use debug registers to set | |
2627 | watchpoints, it's possible that the way to know which watched | |
2628 | address trapped, is to check the register that is used to select | |
2629 | which address to watch. Problem is, between setting the watchpoint | |
2630 | and reading back which data address trapped, the user may change | |
2631 | the set of watchpoints, and, as a consequence, GDB changes the | |
2632 | debug registers in the inferior. To avoid reading back a stale | |
2633 | stopped-data-address when that happens, we cache in LP the fact | |
2634 | that a watchpoint trapped, and the corresponding data address, as | |
2635 | soon as we see LP stop with a SIGTRAP. If GDB changes the debug | |
2636 | registers meanwhile, we have the cached data we can rely on. */ | |
2637 | ||
2638 | static void | |
2639 | save_sigtrap (struct lwp_info *lp) | |
2640 | { | |
2641 | struct cleanup *old_chain; | |
2642 | ||
2643 | if (linux_ops->to_stopped_by_watchpoint == NULL) | |
2644 | { | |
2645 | lp->stopped_by_watchpoint = 0; | |
2646 | return; | |
2647 | } | |
2648 | ||
2649 | old_chain = save_inferior_ptid (); | |
2650 | inferior_ptid = lp->ptid; | |
2651 | ||
2652 | lp->stopped_by_watchpoint = linux_ops->to_stopped_by_watchpoint (); | |
2653 | ||
2654 | if (lp->stopped_by_watchpoint) | |
2655 | { | |
2656 | if (linux_ops->to_stopped_data_address != NULL) | |
2657 | lp->stopped_data_address_p = | |
2658 | linux_ops->to_stopped_data_address (¤t_target, | |
2659 | &lp->stopped_data_address); | |
2660 | else | |
2661 | lp->stopped_data_address_p = 0; | |
2662 | } | |
2663 | ||
2664 | do_cleanups (old_chain); | |
2665 | } | |
2666 | ||
2667 | /* See save_sigtrap. */ | |
2668 | ||
2669 | static int | |
2670 | linux_nat_stopped_by_watchpoint (void) | |
2671 | { | |
2672 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2673 | ||
2674 | gdb_assert (lp != NULL); | |
2675 | ||
2676 | return lp->stopped_by_watchpoint; | |
2677 | } | |
2678 | ||
2679 | static int | |
2680 | linux_nat_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p) | |
2681 | { | |
2682 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2683 | ||
2684 | gdb_assert (lp != NULL); | |
2685 | ||
2686 | *addr_p = lp->stopped_data_address; | |
2687 | ||
2688 | return lp->stopped_data_address_p; | |
2689 | } | |
2690 | ||
26ab7092 JK |
2691 | /* Commonly any breakpoint / watchpoint generate only SIGTRAP. */ |
2692 | ||
2693 | static int | |
2694 | sigtrap_is_event (int status) | |
2695 | { | |
2696 | return WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP; | |
2697 | } | |
2698 | ||
2699 | /* SIGTRAP-like events recognizer. */ | |
2700 | ||
2701 | static int (*linux_nat_status_is_event) (int status) = sigtrap_is_event; | |
2702 | ||
00390b84 JK |
2703 | /* Check for SIGTRAP-like events in LP. */ |
2704 | ||
2705 | static int | |
2706 | linux_nat_lp_status_is_event (struct lwp_info *lp) | |
2707 | { | |
2708 | /* We check for lp->waitstatus in addition to lp->status, because we can | |
2709 | have pending process exits recorded in lp->status | |
2710 | and W_EXITCODE(0,0) == 0. We should probably have an additional | |
2711 | lp->status_p flag. */ | |
2712 | ||
2713 | return (lp->waitstatus.kind == TARGET_WAITKIND_IGNORE | |
2714 | && linux_nat_status_is_event (lp->status)); | |
2715 | } | |
2716 | ||
26ab7092 JK |
2717 | /* Set alternative SIGTRAP-like events recognizer. If |
2718 | breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be | |
2719 | applied. */ | |
2720 | ||
2721 | void | |
2722 | linux_nat_set_status_is_event (struct target_ops *t, | |
2723 | int (*status_is_event) (int status)) | |
2724 | { | |
2725 | linux_nat_status_is_event = status_is_event; | |
2726 | } | |
2727 | ||
57380f4e DJ |
2728 | /* Wait until LP is stopped. */ |
2729 | ||
2730 | static int | |
2731 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2732 | { | |
6c95b8df PA |
2733 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
2734 | ||
2735 | /* If this is a vfork parent, bail out, it is not going to report | |
2736 | any SIGSTOP until the vfork is done with. */ | |
2737 | if (inf->vfork_child != NULL) | |
2738 | return 0; | |
2739 | ||
d6b0e80f AC |
2740 | if (!lp->stopped) |
2741 | { | |
2742 | int status; | |
2743 | ||
2744 | status = wait_lwp (lp); | |
2745 | if (status == 0) | |
2746 | return 0; | |
2747 | ||
57380f4e DJ |
2748 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2749 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2750 | { |
57380f4e | 2751 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2752 | |
2753 | errno = 0; | |
2754 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2755 | if (debug_linux_nat) | |
2756 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2757 | "PTRACE_CONT %s, 0, 0 (%s) " |
2758 | "(discarding SIGINT)\n", | |
d6b0e80f AC |
2759 | target_pid_to_str (lp->ptid), |
2760 | errno ? safe_strerror (errno) : "OK"); | |
2761 | ||
57380f4e | 2762 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2763 | } |
2764 | ||
57380f4e DJ |
2765 | maybe_clear_ignore_sigint (lp); |
2766 | ||
d6b0e80f AC |
2767 | if (WSTOPSIG (status) != SIGSTOP) |
2768 | { | |
26ab7092 | 2769 | if (linux_nat_status_is_event (status)) |
d6b0e80f AC |
2770 | { |
2771 | /* If a LWP other than the LWP that we're reporting an | |
2772 | event for has hit a GDB breakpoint (as opposed to | |
2773 | some random trap signal), then just arrange for it to | |
2774 | hit it again later. We don't keep the SIGTRAP status | |
2775 | and don't forward the SIGTRAP signal to the LWP. We | |
2776 | will handle the current event, eventually we will | |
2777 | resume all LWPs, and this one will get its breakpoint | |
2778 | trap again. | |
2779 | ||
2780 | If we do not do this, then we run the risk that the | |
2781 | user will delete or disable the breakpoint, but the | |
2782 | thread will have already tripped on it. */ | |
2783 | ||
9f0bdab8 DJ |
2784 | /* Save the trap's siginfo in case we need it later. */ |
2785 | save_siginfo (lp); | |
2786 | ||
ebec9a0f PA |
2787 | save_sigtrap (lp); |
2788 | ||
1777feb0 | 2789 | /* Now resume this LWP and get the SIGSTOP event. */ |
d6b0e80f AC |
2790 | errno = 0; |
2791 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2792 | if (debug_linux_nat) | |
2793 | { | |
2794 | fprintf_unfiltered (gdb_stdlog, | |
2795 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2796 | target_pid_to_str (lp->ptid), | |
2797 | errno ? safe_strerror (errno) : "OK"); | |
2798 | ||
2799 | fprintf_unfiltered (gdb_stdlog, | |
2800 | "SWC: Candidate SIGTRAP event in %s\n", | |
2801 | target_pid_to_str (lp->ptid)); | |
2802 | } | |
710151dd | 2803 | /* Hold this event/waitstatus while we check to see if |
1777feb0 | 2804 | there are any more (we still want to get that SIGSTOP). */ |
57380f4e | 2805 | stop_wait_callback (lp, NULL); |
710151dd | 2806 | |
7feb7d06 PA |
2807 | /* Hold the SIGTRAP for handling by linux_nat_wait. If |
2808 | there's another event, throw it back into the | |
1777feb0 | 2809 | queue. */ |
7feb7d06 | 2810 | if (lp->status) |
710151dd | 2811 | { |
7feb7d06 PA |
2812 | if (debug_linux_nat) |
2813 | fprintf_unfiltered (gdb_stdlog, | |
2814 | "SWC: kill %s, %s\n", | |
2815 | target_pid_to_str (lp->ptid), | |
2816 | status_to_str ((int) status)); | |
2817 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2818 | } |
7feb7d06 | 2819 | |
1777feb0 | 2820 | /* Save the sigtrap event. */ |
7feb7d06 | 2821 | lp->status = status; |
d6b0e80f AC |
2822 | return 0; |
2823 | } | |
2824 | else | |
2825 | { | |
2826 | /* The thread was stopped with a signal other than | |
1777feb0 | 2827 | SIGSTOP, and didn't accidentally trip a breakpoint. */ |
d6b0e80f AC |
2828 | |
2829 | if (debug_linux_nat) | |
2830 | { | |
2831 | fprintf_unfiltered (gdb_stdlog, | |
2832 | "SWC: Pending event %s in %s\n", | |
2833 | status_to_str ((int) status), | |
2834 | target_pid_to_str (lp->ptid)); | |
2835 | } | |
1777feb0 | 2836 | /* Now resume this LWP and get the SIGSTOP event. */ |
d6b0e80f AC |
2837 | errno = 0; |
2838 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2839 | if (debug_linux_nat) | |
2840 | fprintf_unfiltered (gdb_stdlog, | |
2841 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2842 | target_pid_to_str (lp->ptid), | |
2843 | errno ? safe_strerror (errno) : "OK"); | |
2844 | ||
2845 | /* Hold this event/waitstatus while we check to see if | |
1777feb0 | 2846 | there are any more (we still want to get that SIGSTOP). */ |
57380f4e | 2847 | stop_wait_callback (lp, NULL); |
710151dd PA |
2848 | |
2849 | /* If the lp->status field is still empty, use it to | |
2850 | hold this event. If not, then this event must be | |
2851 | returned to the event queue of the LWP. */ | |
7feb7d06 | 2852 | if (lp->status) |
d6b0e80f AC |
2853 | { |
2854 | if (debug_linux_nat) | |
2855 | { | |
2856 | fprintf_unfiltered (gdb_stdlog, | |
2857 | "SWC: kill %s, %s\n", | |
2858 | target_pid_to_str (lp->ptid), | |
2859 | status_to_str ((int) status)); | |
2860 | } | |
2861 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2862 | } | |
710151dd PA |
2863 | else |
2864 | lp->status = status; | |
d6b0e80f AC |
2865 | return 0; |
2866 | } | |
2867 | } | |
2868 | else | |
2869 | { | |
2870 | /* We caught the SIGSTOP that we intended to catch, so | |
2871 | there's no SIGSTOP pending. */ | |
2872 | lp->stopped = 1; | |
2873 | lp->signalled = 0; | |
2874 | } | |
2875 | } | |
2876 | ||
2877 | return 0; | |
2878 | } | |
2879 | ||
d6b0e80f AC |
2880 | /* Return non-zero if LP has a wait status pending. */ |
2881 | ||
2882 | static int | |
2883 | status_callback (struct lwp_info *lp, void *data) | |
2884 | { | |
2885 | /* Only report a pending wait status if we pretend that this has | |
2886 | indeed been resumed. */ | |
ca2163eb PA |
2887 | if (!lp->resumed) |
2888 | return 0; | |
2889 | ||
2890 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2891 | { | |
2892 | /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event, | |
766062f6 | 2893 | or a pending process exit. Note that `W_EXITCODE(0,0) == |
ca2163eb PA |
2894 | 0', so a clean process exit can not be stored pending in |
2895 | lp->status, it is indistinguishable from | |
2896 | no-pending-status. */ | |
2897 | return 1; | |
2898 | } | |
2899 | ||
2900 | if (lp->status != 0) | |
2901 | return 1; | |
2902 | ||
2903 | return 0; | |
d6b0e80f AC |
2904 | } |
2905 | ||
2906 | /* Return non-zero if LP isn't stopped. */ | |
2907 | ||
2908 | static int | |
2909 | running_callback (struct lwp_info *lp, void *data) | |
2910 | { | |
25289eb2 PA |
2911 | return (!lp->stopped |
2912 | || ((lp->status != 0 | |
2913 | || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2914 | && lp->resumed)); | |
d6b0e80f AC |
2915 | } |
2916 | ||
2917 | /* Count the LWP's that have had events. */ | |
2918 | ||
2919 | static int | |
2920 | count_events_callback (struct lwp_info *lp, void *data) | |
2921 | { | |
2922 | int *count = data; | |
2923 | ||
2924 | gdb_assert (count != NULL); | |
2925 | ||
e09490f1 | 2926 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
00390b84 | 2927 | if (lp->resumed && linux_nat_lp_status_is_event (lp)) |
d6b0e80f AC |
2928 | (*count)++; |
2929 | ||
2930 | return 0; | |
2931 | } | |
2932 | ||
2933 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2934 | ||
2935 | static int | |
2936 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2937 | { | |
25289eb2 PA |
2938 | if (lp->last_resume_kind == resume_step |
2939 | && lp->status != 0) | |
d6b0e80f AC |
2940 | return 1; |
2941 | else | |
2942 | return 0; | |
2943 | } | |
2944 | ||
2945 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2946 | ||
2947 | static int | |
2948 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2949 | { | |
2950 | int *selector = data; | |
2951 | ||
2952 | gdb_assert (selector != NULL); | |
2953 | ||
1777feb0 | 2954 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
00390b84 | 2955 | if (lp->resumed && linux_nat_lp_status_is_event (lp)) |
d6b0e80f AC |
2956 | if ((*selector)-- == 0) |
2957 | return 1; | |
2958 | ||
2959 | return 0; | |
2960 | } | |
2961 | ||
710151dd PA |
2962 | static int |
2963 | cancel_breakpoint (struct lwp_info *lp) | |
2964 | { | |
2965 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2966 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2967 | LWP. We will handle the current event, eventually we will resume | |
2968 | this LWP, and this breakpoint will trap again. | |
2969 | ||
2970 | If we do not do this, then we run the risk that the user will | |
2971 | delete or disable the breakpoint, but the LWP will have already | |
2972 | tripped on it. */ | |
2973 | ||
515630c5 UW |
2974 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
2975 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2976 | CORE_ADDR pc; | |
2977 | ||
2978 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
6c95b8df | 2979 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) |
710151dd PA |
2980 | { |
2981 | if (debug_linux_nat) | |
2982 | fprintf_unfiltered (gdb_stdlog, | |
2983 | "CB: Push back breakpoint for %s\n", | |
2984 | target_pid_to_str (lp->ptid)); | |
2985 | ||
2986 | /* Back up the PC if necessary. */ | |
515630c5 UW |
2987 | if (gdbarch_decr_pc_after_break (gdbarch)) |
2988 | regcache_write_pc (regcache, pc); | |
2989 | ||
710151dd PA |
2990 | return 1; |
2991 | } | |
2992 | return 0; | |
2993 | } | |
2994 | ||
d6b0e80f AC |
2995 | static int |
2996 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
2997 | { | |
2998 | struct lwp_info *event_lp = data; | |
2999 | ||
3000 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
3001 | if (lp == event_lp) | |
3002 | return 0; | |
3003 | ||
3004 | /* If a LWP other than the LWP that we're reporting an event for has | |
3005 | hit a GDB breakpoint (as opposed to some random trap signal), | |
3006 | then just arrange for it to hit it again later. We don't keep | |
3007 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
3008 | LWP. We will handle the current event, eventually we will resume | |
3009 | all LWPs, and this one will get its breakpoint trap again. | |
3010 | ||
3011 | If we do not do this, then we run the risk that the user will | |
3012 | delete or disable the breakpoint, but the LWP will have already | |
3013 | tripped on it. */ | |
3014 | ||
00390b84 | 3015 | if (linux_nat_lp_status_is_event (lp) |
710151dd PA |
3016 | && cancel_breakpoint (lp)) |
3017 | /* Throw away the SIGTRAP. */ | |
3018 | lp->status = 0; | |
d6b0e80f AC |
3019 | |
3020 | return 0; | |
3021 | } | |
3022 | ||
3023 | /* Select one LWP out of those that have events pending. */ | |
3024 | ||
3025 | static void | |
d90e17a7 | 3026 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
3027 | { |
3028 | int num_events = 0; | |
3029 | int random_selector; | |
3030 | struct lwp_info *event_lp; | |
3031 | ||
ac264b3b | 3032 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
3033 | (*orig_lp)->status = *status; |
3034 | ||
3035 | /* Give preference to any LWP that is being single-stepped. */ | |
d90e17a7 PA |
3036 | event_lp = iterate_over_lwps (filter, |
3037 | select_singlestep_lwp_callback, NULL); | |
d6b0e80f AC |
3038 | if (event_lp != NULL) |
3039 | { | |
3040 | if (debug_linux_nat) | |
3041 | fprintf_unfiltered (gdb_stdlog, | |
3042 | "SEL: Select single-step %s\n", | |
3043 | target_pid_to_str (event_lp->ptid)); | |
3044 | } | |
3045 | else | |
3046 | { | |
3047 | /* No single-stepping LWP. Select one at random, out of those | |
3048 | which have had SIGTRAP events. */ | |
3049 | ||
3050 | /* First see how many SIGTRAP events we have. */ | |
d90e17a7 | 3051 | iterate_over_lwps (filter, count_events_callback, &num_events); |
d6b0e80f AC |
3052 | |
3053 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
3054 | random_selector = (int) | |
3055 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
3056 | ||
3057 | if (debug_linux_nat && num_events > 1) | |
3058 | fprintf_unfiltered (gdb_stdlog, | |
3059 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
3060 | num_events, random_selector); | |
3061 | ||
d90e17a7 PA |
3062 | event_lp = iterate_over_lwps (filter, |
3063 | select_event_lwp_callback, | |
d6b0e80f AC |
3064 | &random_selector); |
3065 | } | |
3066 | ||
3067 | if (event_lp != NULL) | |
3068 | { | |
3069 | /* Switch the event LWP. */ | |
3070 | *orig_lp = event_lp; | |
3071 | *status = event_lp->status; | |
3072 | } | |
3073 | ||
3074 | /* Flush the wait status for the event LWP. */ | |
3075 | (*orig_lp)->status = 0; | |
3076 | } | |
3077 | ||
3078 | /* Return non-zero if LP has been resumed. */ | |
3079 | ||
3080 | static int | |
3081 | resumed_callback (struct lwp_info *lp, void *data) | |
3082 | { | |
3083 | return lp->resumed; | |
3084 | } | |
3085 | ||
d6b0e80f AC |
3086 | /* Stop an active thread, verify it still exists, then resume it. */ |
3087 | ||
3088 | static int | |
3089 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
3090 | { | |
25289eb2 | 3091 | if (!lp->stopped) |
d6b0e80f | 3092 | { |
25289eb2 PA |
3093 | enum resume_kind last_resume_kind = lp->last_resume_kind; |
3094 | ptid_t ptid = lp->ptid; | |
3095 | ||
d6b0e80f AC |
3096 | stop_callback (lp, NULL); |
3097 | stop_wait_callback (lp, NULL); | |
25289eb2 PA |
3098 | |
3099 | /* Resume if the lwp still exists, and the core wanted it | |
3100 | running. */ | |
3101 | if (last_resume_kind != resume_stop) | |
3102 | { | |
3103 | lp = find_lwp_pid (ptid); | |
3104 | if (lp) | |
3105 | resume_lwp (lp, lp->step); | |
3106 | } | |
d6b0e80f AC |
3107 | } |
3108 | return 0; | |
3109 | } | |
3110 | ||
02f3fc28 | 3111 | /* Check if we should go on and pass this event to common code. |
fa2c6a57 | 3112 | Return the affected lwp if we are, or NULL otherwise. */ |
02f3fc28 PA |
3113 | static struct lwp_info * |
3114 | linux_nat_filter_event (int lwpid, int status, int options) | |
3115 | { | |
3116 | struct lwp_info *lp; | |
3117 | ||
3118 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
3119 | ||
3120 | /* Check for stop events reported by a process we didn't already | |
3121 | know about - anything not already in our LWP list. | |
3122 | ||
3123 | If we're expecting to receive stopped processes after | |
3124 | fork, vfork, and clone events, then we'll just add the | |
3125 | new one to our list and go back to waiting for the event | |
3126 | to be reported - the stopped process might be returned | |
3127 | from waitpid before or after the event is. */ | |
3128 | if (WIFSTOPPED (status) && !lp) | |
3129 | { | |
84636d28 | 3130 | add_to_pid_list (&stopped_pids, lwpid, status); |
02f3fc28 PA |
3131 | return NULL; |
3132 | } | |
3133 | ||
3134 | /* Make sure we don't report an event for the exit of an LWP not in | |
1777feb0 | 3135 | our list, i.e. not part of the current process. This can happen |
fd62cb89 | 3136 | if we detach from a program we originally forked and then it |
02f3fc28 PA |
3137 | exits. */ |
3138 | if (!WIFSTOPPED (status) && !lp) | |
3139 | return NULL; | |
3140 | ||
3141 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
3142 | CLONE_PTRACE processes which do not use the thread library - | |
3143 | otherwise we wouldn't find the new LWP this way. That doesn't | |
3144 | currently work, and the following code is currently unreachable | |
3145 | due to the two blocks above. If it's fixed some day, this code | |
3146 | should be broken out into a function so that we can also pick up | |
3147 | LWPs from the new interface. */ | |
3148 | if (!lp) | |
3149 | { | |
3150 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
3151 | if (options & __WCLONE) | |
3152 | lp->cloned = 1; | |
3153 | ||
3154 | gdb_assert (WIFSTOPPED (status) | |
3155 | && WSTOPSIG (status) == SIGSTOP); | |
3156 | lp->signalled = 1; | |
3157 | ||
3158 | if (!in_thread_list (inferior_ptid)) | |
3159 | { | |
3160 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
3161 | GET_PID (inferior_ptid)); | |
3162 | add_thread (inferior_ptid); | |
3163 | } | |
3164 | ||
3165 | add_thread (lp->ptid); | |
3166 | } | |
3167 | ||
ca2163eb PA |
3168 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
3169 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
3170 | { | |
3171 | /* No longer need the sysgood bit. The ptrace event ends up | |
3172 | recorded in lp->waitstatus if we care for it. We can carry | |
3173 | on handling the event like a regular SIGTRAP from here | |
3174 | on. */ | |
3175 | status = W_STOPCODE (SIGTRAP); | |
3176 | if (linux_handle_syscall_trap (lp, 0)) | |
3177 | return NULL; | |
3178 | } | |
02f3fc28 | 3179 | |
ca2163eb PA |
3180 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
3181 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
02f3fc28 PA |
3182 | { |
3183 | if (debug_linux_nat) | |
3184 | fprintf_unfiltered (gdb_stdlog, | |
3185 | "LLW: Handling extended status 0x%06x\n", | |
3186 | status); | |
3187 | if (linux_handle_extended_wait (lp, status, 0)) | |
3188 | return NULL; | |
3189 | } | |
3190 | ||
26ab7092 | 3191 | if (linux_nat_status_is_event (status)) |
ebec9a0f PA |
3192 | { |
3193 | /* Save the trap's siginfo in case we need it later. */ | |
3194 | save_siginfo (lp); | |
3195 | ||
3196 | save_sigtrap (lp); | |
3197 | } | |
ca2163eb | 3198 | |
02f3fc28 | 3199 | /* Check if the thread has exited. */ |
d90e17a7 PA |
3200 | if ((WIFEXITED (status) || WIFSIGNALED (status)) |
3201 | && num_lwps (GET_PID (lp->ptid)) > 1) | |
02f3fc28 | 3202 | { |
9db03742 JB |
3203 | /* If this is the main thread, we must stop all threads and verify |
3204 | if they are still alive. This is because in the nptl thread model | |
3205 | on Linux 2.4, there is no signal issued for exiting LWPs | |
02f3fc28 PA |
3206 | other than the main thread. We only get the main thread exit |
3207 | signal once all child threads have already exited. If we | |
3208 | stop all the threads and use the stop_wait_callback to check | |
3209 | if they have exited we can determine whether this signal | |
3210 | should be ignored or whether it means the end of the debugged | |
3211 | application, regardless of which threading model is being | |
5d3b6af6 | 3212 | used. */ |
02f3fc28 PA |
3213 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) |
3214 | { | |
3215 | lp->stopped = 1; | |
d90e17a7 PA |
3216 | iterate_over_lwps (pid_to_ptid (GET_PID (lp->ptid)), |
3217 | stop_and_resume_callback, NULL); | |
02f3fc28 PA |
3218 | } |
3219 | ||
3220 | if (debug_linux_nat) | |
3221 | fprintf_unfiltered (gdb_stdlog, | |
3222 | "LLW: %s exited.\n", | |
3223 | target_pid_to_str (lp->ptid)); | |
3224 | ||
d90e17a7 | 3225 | if (num_lwps (GET_PID (lp->ptid)) > 1) |
9db03742 JB |
3226 | { |
3227 | /* If there is at least one more LWP, then the exit signal | |
3228 | was not the end of the debugged application and should be | |
3229 | ignored. */ | |
3230 | exit_lwp (lp); | |
3231 | return NULL; | |
3232 | } | |
02f3fc28 PA |
3233 | } |
3234 | ||
3235 | /* Check if the current LWP has previously exited. In the nptl | |
3236 | thread model, LWPs other than the main thread do not issue | |
3237 | signals when they exit so we must check whenever the thread has | |
3238 | stopped. A similar check is made in stop_wait_callback(). */ | |
d90e17a7 | 3239 | if (num_lwps (GET_PID (lp->ptid)) > 1 && !linux_thread_alive (lp->ptid)) |
02f3fc28 | 3240 | { |
d90e17a7 PA |
3241 | ptid_t ptid = pid_to_ptid (GET_PID (lp->ptid)); |
3242 | ||
02f3fc28 PA |
3243 | if (debug_linux_nat) |
3244 | fprintf_unfiltered (gdb_stdlog, | |
3245 | "LLW: %s exited.\n", | |
3246 | target_pid_to_str (lp->ptid)); | |
3247 | ||
3248 | exit_lwp (lp); | |
3249 | ||
3250 | /* Make sure there is at least one thread running. */ | |
d90e17a7 | 3251 | gdb_assert (iterate_over_lwps (ptid, running_callback, NULL)); |
02f3fc28 PA |
3252 | |
3253 | /* Discard the event. */ | |
3254 | return NULL; | |
3255 | } | |
3256 | ||
3257 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
3258 | an attempt to stop an LWP. */ | |
3259 | if (lp->signalled | |
3260 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
3261 | { | |
3262 | if (debug_linux_nat) | |
3263 | fprintf_unfiltered (gdb_stdlog, | |
3264 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
3265 | target_pid_to_str (lp->ptid)); | |
3266 | ||
02f3fc28 PA |
3267 | lp->signalled = 0; |
3268 | ||
25289eb2 PA |
3269 | if (lp->last_resume_kind != resume_stop) |
3270 | { | |
3271 | /* This is a delayed SIGSTOP. */ | |
02f3fc28 | 3272 | |
25289eb2 PA |
3273 | registers_changed (); |
3274 | ||
3275 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
02f3fc28 | 3276 | lp->step, TARGET_SIGNAL_0); |
25289eb2 PA |
3277 | if (debug_linux_nat) |
3278 | fprintf_unfiltered (gdb_stdlog, | |
3279 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
3280 | lp->step ? | |
3281 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3282 | target_pid_to_str (lp->ptid)); | |
02f3fc28 | 3283 | |
25289eb2 PA |
3284 | lp->stopped = 0; |
3285 | gdb_assert (lp->resumed); | |
02f3fc28 | 3286 | |
25289eb2 PA |
3287 | /* Discard the event. */ |
3288 | return NULL; | |
3289 | } | |
02f3fc28 PA |
3290 | } |
3291 | ||
57380f4e DJ |
3292 | /* Make sure we don't report a SIGINT that we have already displayed |
3293 | for another thread. */ | |
3294 | if (lp->ignore_sigint | |
3295 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
3296 | { | |
3297 | if (debug_linux_nat) | |
3298 | fprintf_unfiltered (gdb_stdlog, | |
3299 | "LLW: Delayed SIGINT caught for %s.\n", | |
3300 | target_pid_to_str (lp->ptid)); | |
3301 | ||
3302 | /* This is a delayed SIGINT. */ | |
3303 | lp->ignore_sigint = 0; | |
3304 | ||
3305 | registers_changed (); | |
28439f5e | 3306 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
57380f4e DJ |
3307 | lp->step, TARGET_SIGNAL_0); |
3308 | if (debug_linux_nat) | |
3309 | fprintf_unfiltered (gdb_stdlog, | |
3310 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
3311 | lp->step ? | |
3312 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3313 | target_pid_to_str (lp->ptid)); | |
3314 | ||
3315 | lp->stopped = 0; | |
3316 | gdb_assert (lp->resumed); | |
3317 | ||
3318 | /* Discard the event. */ | |
3319 | return NULL; | |
3320 | } | |
3321 | ||
02f3fc28 PA |
3322 | /* An interesting event. */ |
3323 | gdb_assert (lp); | |
ca2163eb | 3324 | lp->status = status; |
02f3fc28 PA |
3325 | return lp; |
3326 | } | |
3327 | ||
d6b0e80f | 3328 | static ptid_t |
7feb7d06 | 3329 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
3330 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3331 | int target_options) | |
d6b0e80f | 3332 | { |
7feb7d06 | 3333 | static sigset_t prev_mask; |
4b60df3d | 3334 | enum resume_kind last_resume_kind; |
d6b0e80f AC |
3335 | struct lwp_info *lp = NULL; |
3336 | int options = 0; | |
3337 | int status = 0; | |
d90e17a7 | 3338 | pid_t pid; |
d6b0e80f | 3339 | |
01124a23 | 3340 | if (debug_linux_nat) |
b84876c2 PA |
3341 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); |
3342 | ||
f973ed9c DJ |
3343 | /* The first time we get here after starting a new inferior, we may |
3344 | not have added it to the LWP list yet - this is the earliest | |
3345 | moment at which we know its PID. */ | |
d90e17a7 | 3346 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 3347 | { |
27c9d204 PA |
3348 | /* Upgrade the main thread's ptid. */ |
3349 | thread_change_ptid (inferior_ptid, | |
3350 | BUILD_LWP (GET_PID (inferior_ptid), | |
3351 | GET_PID (inferior_ptid))); | |
3352 | ||
f973ed9c DJ |
3353 | lp = add_lwp (inferior_ptid); |
3354 | lp->resumed = 1; | |
3355 | } | |
3356 | ||
7feb7d06 PA |
3357 | /* Make sure SIGCHLD is blocked. */ |
3358 | block_child_signals (&prev_mask); | |
d6b0e80f | 3359 | |
d90e17a7 PA |
3360 | if (ptid_equal (ptid, minus_one_ptid)) |
3361 | pid = -1; | |
3362 | else if (ptid_is_pid (ptid)) | |
3363 | /* A request to wait for a specific tgid. This is not possible | |
3364 | with waitpid, so instead, we wait for any child, and leave | |
3365 | children we're not interested in right now with a pending | |
3366 | status to report later. */ | |
3367 | pid = -1; | |
3368 | else | |
3369 | pid = GET_LWP (ptid); | |
3370 | ||
d6b0e80f | 3371 | retry: |
d90e17a7 PA |
3372 | lp = NULL; |
3373 | status = 0; | |
d6b0e80f | 3374 | |
e3e9f5a2 PA |
3375 | /* Make sure that of those LWPs we want to get an event from, there |
3376 | is at least one LWP that has been resumed. If there's none, just | |
3377 | bail out. The core may just be flushing asynchronously all | |
3378 | events. */ | |
3379 | if (iterate_over_lwps (ptid, resumed_callback, NULL) == NULL) | |
3380 | { | |
3381 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3382 | ||
01124a23 | 3383 | if (debug_linux_nat) |
e3e9f5a2 PA |
3384 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (no resumed LWP)\n"); |
3385 | ||
3386 | restore_child_signals_mask (&prev_mask); | |
3387 | return minus_one_ptid; | |
3388 | } | |
d6b0e80f AC |
3389 | |
3390 | /* First check if there is a LWP with a wait status pending. */ | |
3391 | if (pid == -1) | |
3392 | { | |
3393 | /* Any LWP that's been resumed will do. */ | |
d90e17a7 | 3394 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
d6b0e80f AC |
3395 | if (lp) |
3396 | { | |
ca2163eb | 3397 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3398 | fprintf_unfiltered (gdb_stdlog, |
3399 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3400 | status_to_str (lp->status), |
d6b0e80f AC |
3401 | target_pid_to_str (lp->ptid)); |
3402 | } | |
3403 | ||
b84876c2 | 3404 | /* But if we don't find one, we'll have to wait, and check both |
7feb7d06 PA |
3405 | cloned and uncloned processes. We start with the cloned |
3406 | processes. */ | |
d6b0e80f AC |
3407 | options = __WCLONE | WNOHANG; |
3408 | } | |
3409 | else if (is_lwp (ptid)) | |
3410 | { | |
3411 | if (debug_linux_nat) | |
3412 | fprintf_unfiltered (gdb_stdlog, | |
3413 | "LLW: Waiting for specific LWP %s.\n", | |
3414 | target_pid_to_str (ptid)); | |
3415 | ||
3416 | /* We have a specific LWP to check. */ | |
3417 | lp = find_lwp_pid (ptid); | |
3418 | gdb_assert (lp); | |
d6b0e80f | 3419 | |
ca2163eb | 3420 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3421 | fprintf_unfiltered (gdb_stdlog, |
3422 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3423 | status_to_str (lp->status), |
d6b0e80f AC |
3424 | target_pid_to_str (lp->ptid)); |
3425 | ||
3426 | /* If we have to wait, take into account whether PID is a cloned | |
3427 | process or not. And we have to convert it to something that | |
3428 | the layer beneath us can understand. */ | |
3429 | options = lp->cloned ? __WCLONE : 0; | |
3430 | pid = GET_LWP (ptid); | |
d90e17a7 PA |
3431 | |
3432 | /* We check for lp->waitstatus in addition to lp->status, | |
3433 | because we can have pending process exits recorded in | |
3434 | lp->status and W_EXITCODE(0,0) == 0. We should probably have | |
3435 | an additional lp->status_p flag. */ | |
ca2163eb | 3436 | if (lp->status == 0 && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) |
d90e17a7 | 3437 | lp = NULL; |
d6b0e80f AC |
3438 | } |
3439 | ||
25289eb2 | 3440 | if (lp && lp->signalled && lp->last_resume_kind != resume_stop) |
d6b0e80f AC |
3441 | { |
3442 | /* A pending SIGSTOP may interfere with the normal stream of | |
3443 | events. In a typical case where interference is a problem, | |
3444 | we have a SIGSTOP signal pending for LWP A while | |
3445 | single-stepping it, encounter an event in LWP B, and take the | |
3446 | pending SIGSTOP while trying to stop LWP A. After processing | |
3447 | the event in LWP B, LWP A is continued, and we'll never see | |
3448 | the SIGTRAP associated with the last time we were | |
3449 | single-stepping LWP A. */ | |
3450 | ||
3451 | /* Resume the thread. It should halt immediately returning the | |
3452 | pending SIGSTOP. */ | |
3453 | registers_changed (); | |
28439f5e | 3454 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3455 | lp->step, TARGET_SIGNAL_0); |
d6b0e80f AC |
3456 | if (debug_linux_nat) |
3457 | fprintf_unfiltered (gdb_stdlog, | |
3458 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
3459 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3460 | target_pid_to_str (lp->ptid)); | |
3461 | lp->stopped = 0; | |
3462 | gdb_assert (lp->resumed); | |
3463 | ||
ca2163eb PA |
3464 | /* Catch the pending SIGSTOP. */ |
3465 | status = lp->status; | |
3466 | lp->status = 0; | |
3467 | ||
d6b0e80f | 3468 | stop_wait_callback (lp, NULL); |
ca2163eb PA |
3469 | |
3470 | /* If the lp->status field isn't empty, we caught another signal | |
3471 | while flushing the SIGSTOP. Return it back to the event | |
3472 | queue of the LWP, as we already have an event to handle. */ | |
3473 | if (lp->status) | |
3474 | { | |
3475 | if (debug_linux_nat) | |
3476 | fprintf_unfiltered (gdb_stdlog, | |
3477 | "LLW: kill %s, %s\n", | |
3478 | target_pid_to_str (lp->ptid), | |
3479 | status_to_str (lp->status)); | |
3480 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
3481 | } | |
3482 | ||
3483 | lp->status = status; | |
d6b0e80f AC |
3484 | } |
3485 | ||
b84876c2 PA |
3486 | if (!target_can_async_p ()) |
3487 | { | |
3488 | /* Causes SIGINT to be passed on to the attached process. */ | |
3489 | set_sigint_trap (); | |
b84876c2 | 3490 | } |
d6b0e80f | 3491 | |
47608cb1 PA |
3492 | /* Translate generic target_wait options into waitpid options. */ |
3493 | if (target_options & TARGET_WNOHANG) | |
3494 | options |= WNOHANG; | |
7feb7d06 | 3495 | |
d90e17a7 | 3496 | while (lp == NULL) |
d6b0e80f AC |
3497 | { |
3498 | pid_t lwpid; | |
3499 | ||
7feb7d06 | 3500 | lwpid = my_waitpid (pid, &status, options); |
b84876c2 | 3501 | |
d6b0e80f AC |
3502 | if (lwpid > 0) |
3503 | { | |
3504 | gdb_assert (pid == -1 || lwpid == pid); | |
3505 | ||
3506 | if (debug_linux_nat) | |
3507 | { | |
3508 | fprintf_unfiltered (gdb_stdlog, | |
3509 | "LLW: waitpid %ld received %s\n", | |
3510 | (long) lwpid, status_to_str (status)); | |
3511 | } | |
3512 | ||
02f3fc28 | 3513 | lp = linux_nat_filter_event (lwpid, status, options); |
d90e17a7 | 3514 | |
33355866 JK |
3515 | /* STATUS is now no longer valid, use LP->STATUS instead. */ |
3516 | status = 0; | |
3517 | ||
d90e17a7 PA |
3518 | if (lp |
3519 | && ptid_is_pid (ptid) | |
3520 | && ptid_get_pid (lp->ptid) != ptid_get_pid (ptid)) | |
d6b0e80f | 3521 | { |
e3e9f5a2 PA |
3522 | gdb_assert (lp->resumed); |
3523 | ||
d90e17a7 | 3524 | if (debug_linux_nat) |
3e43a32a MS |
3525 | fprintf (stderr, |
3526 | "LWP %ld got an event %06x, leaving pending.\n", | |
33355866 | 3527 | ptid_get_lwp (lp->ptid), lp->status); |
d90e17a7 | 3528 | |
ca2163eb | 3529 | if (WIFSTOPPED (lp->status)) |
d90e17a7 | 3530 | { |
ca2163eb | 3531 | if (WSTOPSIG (lp->status) != SIGSTOP) |
d90e17a7 | 3532 | { |
e3e9f5a2 PA |
3533 | /* Cancel breakpoint hits. The breakpoint may |
3534 | be removed before we fetch events from this | |
3535 | process to report to the core. It is best | |
3536 | not to assume the moribund breakpoints | |
3537 | heuristic always handles these cases --- it | |
3538 | could be too many events go through to the | |
3539 | core before this one is handled. All-stop | |
3540 | always cancels breakpoint hits in all | |
3541 | threads. */ | |
3542 | if (non_stop | |
00390b84 | 3543 | && linux_nat_lp_status_is_event (lp) |
e3e9f5a2 PA |
3544 | && cancel_breakpoint (lp)) |
3545 | { | |
3546 | /* Throw away the SIGTRAP. */ | |
3547 | lp->status = 0; | |
3548 | ||
3549 | if (debug_linux_nat) | |
3550 | fprintf (stderr, | |
3e43a32a MS |
3551 | "LLW: LWP %ld hit a breakpoint while" |
3552 | " waiting for another process;" | |
3553 | " cancelled it\n", | |
e3e9f5a2 PA |
3554 | ptid_get_lwp (lp->ptid)); |
3555 | } | |
3556 | lp->stopped = 1; | |
d90e17a7 PA |
3557 | } |
3558 | else | |
3559 | { | |
3560 | lp->stopped = 1; | |
3561 | lp->signalled = 0; | |
3562 | } | |
3563 | } | |
33355866 | 3564 | else if (WIFEXITED (lp->status) || WIFSIGNALED (lp->status)) |
d90e17a7 PA |
3565 | { |
3566 | if (debug_linux_nat) | |
3e43a32a MS |
3567 | fprintf (stderr, |
3568 | "Process %ld exited while stopping LWPs\n", | |
d90e17a7 PA |
3569 | ptid_get_lwp (lp->ptid)); |
3570 | ||
3571 | /* This was the last lwp in the process. Since | |
3572 | events are serialized to GDB core, and we can't | |
3573 | report this one right now, but GDB core and the | |
3574 | other target layers will want to be notified | |
3575 | about the exit code/signal, leave the status | |
3576 | pending for the next time we're able to report | |
3577 | it. */ | |
d90e17a7 PA |
3578 | |
3579 | /* Prevent trying to stop this thread again. We'll | |
3580 | never try to resume it because it has a pending | |
3581 | status. */ | |
3582 | lp->stopped = 1; | |
3583 | ||
3584 | /* Dead LWP's aren't expected to reported a pending | |
3585 | sigstop. */ | |
3586 | lp->signalled = 0; | |
3587 | ||
3588 | /* Store the pending event in the waitstatus as | |
3589 | well, because W_EXITCODE(0,0) == 0. */ | |
ca2163eb | 3590 | store_waitstatus (&lp->waitstatus, lp->status); |
d90e17a7 PA |
3591 | } |
3592 | ||
3593 | /* Keep looking. */ | |
3594 | lp = NULL; | |
d6b0e80f AC |
3595 | continue; |
3596 | } | |
3597 | ||
d90e17a7 PA |
3598 | if (lp) |
3599 | break; | |
3600 | else | |
3601 | { | |
3602 | if (pid == -1) | |
3603 | { | |
3604 | /* waitpid did return something. Restart over. */ | |
3605 | options |= __WCLONE; | |
3606 | } | |
3607 | continue; | |
3608 | } | |
d6b0e80f AC |
3609 | } |
3610 | ||
3611 | if (pid == -1) | |
3612 | { | |
3613 | /* Alternate between checking cloned and uncloned processes. */ | |
3614 | options ^= __WCLONE; | |
3615 | ||
b84876c2 PA |
3616 | /* And every time we have checked both: |
3617 | In async mode, return to event loop; | |
3618 | In sync mode, suspend waiting for a SIGCHLD signal. */ | |
d6b0e80f | 3619 | if (options & __WCLONE) |
b84876c2 | 3620 | { |
47608cb1 | 3621 | if (target_options & TARGET_WNOHANG) |
b84876c2 PA |
3622 | { |
3623 | /* No interesting event. */ | |
3624 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3625 | ||
01124a23 | 3626 | if (debug_linux_nat) |
b84876c2 PA |
3627 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); |
3628 | ||
7feb7d06 | 3629 | restore_child_signals_mask (&prev_mask); |
b84876c2 PA |
3630 | return minus_one_ptid; |
3631 | } | |
3632 | ||
3633 | sigsuspend (&suspend_mask); | |
3634 | } | |
d6b0e80f | 3635 | } |
28736962 PA |
3636 | else if (target_options & TARGET_WNOHANG) |
3637 | { | |
3638 | /* No interesting event for PID yet. */ | |
3639 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3640 | ||
01124a23 | 3641 | if (debug_linux_nat) |
28736962 PA |
3642 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); |
3643 | ||
3644 | restore_child_signals_mask (&prev_mask); | |
3645 | return minus_one_ptid; | |
3646 | } | |
d6b0e80f AC |
3647 | |
3648 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 3649 | gdb_assert (lp == NULL); |
d6b0e80f AC |
3650 | } |
3651 | ||
b84876c2 | 3652 | if (!target_can_async_p ()) |
d26b5354 | 3653 | clear_sigint_trap (); |
d6b0e80f AC |
3654 | |
3655 | gdb_assert (lp); | |
3656 | ||
ca2163eb PA |
3657 | status = lp->status; |
3658 | lp->status = 0; | |
3659 | ||
d6b0e80f AC |
3660 | /* Don't report signals that GDB isn't interested in, such as |
3661 | signals that are neither printed nor stopped upon. Stopping all | |
3662 | threads can be a bit time-consuming so if we want decent | |
3663 | performance with heavily multi-threaded programs, especially when | |
3664 | they're using a high frequency timer, we'd better avoid it if we | |
3665 | can. */ | |
3666 | ||
3667 | if (WIFSTOPPED (status)) | |
3668 | { | |
423ec54c | 3669 | enum target_signal signo = target_signal_from_host (WSTOPSIG (status)); |
d6b0e80f | 3670 | |
2455069d UW |
3671 | /* When using hardware single-step, we need to report every signal. |
3672 | Otherwise, signals in pass_mask may be short-circuited. */ | |
d539ed7e | 3673 | if (!lp->step |
2455069d | 3674 | && WSTOPSIG (status) && sigismember (&pass_mask, WSTOPSIG (status))) |
d6b0e80f AC |
3675 | { |
3676 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
3677 | here? It is not clear we should. GDB may not expect | |
3678 | other threads to run. On the other hand, not resuming | |
3679 | newly attached threads may cause an unwanted delay in | |
3680 | getting them running. */ | |
3681 | registers_changed (); | |
28439f5e | 3682 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3683 | lp->step, signo); |
d6b0e80f AC |
3684 | if (debug_linux_nat) |
3685 | fprintf_unfiltered (gdb_stdlog, | |
3686 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3687 | lp->step ? | |
3688 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3689 | target_pid_to_str (lp->ptid), | |
423ec54c JK |
3690 | (signo != TARGET_SIGNAL_0 |
3691 | ? strsignal (target_signal_to_host (signo)) | |
3692 | : "0")); | |
d6b0e80f | 3693 | lp->stopped = 0; |
d6b0e80f AC |
3694 | goto retry; |
3695 | } | |
3696 | ||
1ad15515 | 3697 | if (!non_stop) |
d6b0e80f | 3698 | { |
1ad15515 PA |
3699 | /* Only do the below in all-stop, as we currently use SIGINT |
3700 | to implement target_stop (see linux_nat_stop) in | |
3701 | non-stop. */ | |
3702 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3703 | { | |
3704 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3705 | forwarded to the entire process group, that is, all LWPs | |
3706 | will receive it - unless they're using CLONE_THREAD to | |
3707 | share signals. Since we only want to report it once, we | |
3708 | mark it as ignored for all LWPs except this one. */ | |
d90e17a7 PA |
3709 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid)), |
3710 | set_ignore_sigint, NULL); | |
1ad15515 PA |
3711 | lp->ignore_sigint = 0; |
3712 | } | |
3713 | else | |
3714 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
3715 | } |
3716 | } | |
3717 | ||
3718 | /* This LWP is stopped now. */ | |
3719 | lp->stopped = 1; | |
3720 | ||
3721 | if (debug_linux_nat) | |
3722 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
3723 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
3724 | ||
4c28f408 PA |
3725 | if (!non_stop) |
3726 | { | |
3727 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3728 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3729 | |
3730 | /* ... and wait until all of them have reported back that | |
3731 | they're no longer running. */ | |
d90e17a7 | 3732 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
4c28f408 PA |
3733 | |
3734 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3735 | from among those that have had events. Giving equal priority | |
3736 | to all LWPs that have had events helps prevent | |
3737 | starvation. */ | |
3738 | if (pid == -1) | |
d90e17a7 | 3739 | select_event_lwp (ptid, &lp, &status); |
d6b0e80f | 3740 | |
e3e9f5a2 PA |
3741 | /* Now that we've selected our final event LWP, cancel any |
3742 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
3743 | See the comment in cancel_breakpoints_callback to find out | |
3744 | why. */ | |
3745 | iterate_over_lwps (minus_one_ptid, cancel_breakpoints_callback, lp); | |
3746 | ||
4b60df3d PA |
3747 | /* We'll need this to determine whether to report a SIGSTOP as |
3748 | TARGET_WAITKIND_0. Need to take a copy because | |
3749 | resume_clear_callback clears it. */ | |
3750 | last_resume_kind = lp->last_resume_kind; | |
3751 | ||
e3e9f5a2 PA |
3752 | /* In all-stop, from the core's perspective, all LWPs are now |
3753 | stopped until a new resume action is sent over. */ | |
3754 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
3755 | } | |
3756 | else | |
25289eb2 | 3757 | { |
4b60df3d PA |
3758 | /* See above. */ |
3759 | last_resume_kind = lp->last_resume_kind; | |
3760 | resume_clear_callback (lp, NULL); | |
25289eb2 | 3761 | } |
d6b0e80f | 3762 | |
26ab7092 | 3763 | if (linux_nat_status_is_event (status)) |
d6b0e80f | 3764 | { |
d6b0e80f AC |
3765 | if (debug_linux_nat) |
3766 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3767 | "LLW: trap ptid is %s.\n", |
3768 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3769 | } |
d6b0e80f AC |
3770 | |
3771 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3772 | { | |
3773 | *ourstatus = lp->waitstatus; | |
3774 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3775 | } | |
3776 | else | |
3777 | store_waitstatus (ourstatus, status); | |
3778 | ||
01124a23 | 3779 | if (debug_linux_nat) |
b84876c2 PA |
3780 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); |
3781 | ||
7feb7d06 | 3782 | restore_child_signals_mask (&prev_mask); |
1e225492 | 3783 | |
4b60df3d | 3784 | if (last_resume_kind == resume_stop |
25289eb2 PA |
3785 | && ourstatus->kind == TARGET_WAITKIND_STOPPED |
3786 | && WSTOPSIG (status) == SIGSTOP) | |
3787 | { | |
3788 | /* A thread that has been requested to stop by GDB with | |
3789 | target_stop, and it stopped cleanly, so report as SIG0. The | |
3790 | use of SIGSTOP is an implementation detail. */ | |
3791 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
3792 | } | |
3793 | ||
1e225492 JK |
3794 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
3795 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
3796 | lp->core = -1; | |
3797 | else | |
3798 | lp->core = linux_nat_core_of_thread_1 (lp->ptid); | |
3799 | ||
f973ed9c | 3800 | return lp->ptid; |
d6b0e80f AC |
3801 | } |
3802 | ||
e3e9f5a2 PA |
3803 | /* Resume LWPs that are currently stopped without any pending status |
3804 | to report, but are resumed from the core's perspective. */ | |
3805 | ||
3806 | static int | |
3807 | resume_stopped_resumed_lwps (struct lwp_info *lp, void *data) | |
3808 | { | |
3809 | ptid_t *wait_ptid_p = data; | |
3810 | ||
3811 | if (lp->stopped | |
3812 | && lp->resumed | |
3813 | && lp->status == 0 | |
3814 | && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) | |
3815 | { | |
3816 | gdb_assert (is_executing (lp->ptid)); | |
3817 | ||
3818 | /* Don't bother if there's a breakpoint at PC that we'd hit | |
3819 | immediately, and we're not waiting for this LWP. */ | |
3820 | if (!ptid_match (lp->ptid, *wait_ptid_p)) | |
3821 | { | |
3822 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
3823 | CORE_ADDR pc = regcache_read_pc (regcache); | |
3824 | ||
3825 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3826 | return 0; | |
3827 | } | |
3828 | ||
3829 | if (debug_linux_nat) | |
3830 | fprintf_unfiltered (gdb_stdlog, | |
3831 | "RSRL: resuming stopped-resumed LWP %s\n", | |
3832 | target_pid_to_str (lp->ptid)); | |
3833 | ||
3834 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
3835 | lp->step, TARGET_SIGNAL_0); | |
3836 | lp->stopped = 0; | |
3837 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
3838 | lp->stopped_by_watchpoint = 0; | |
3839 | } | |
3840 | ||
3841 | return 0; | |
3842 | } | |
3843 | ||
7feb7d06 PA |
3844 | static ptid_t |
3845 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3846 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3847 | int target_options) | |
7feb7d06 PA |
3848 | { |
3849 | ptid_t event_ptid; | |
3850 | ||
3851 | if (debug_linux_nat) | |
3e43a32a MS |
3852 | fprintf_unfiltered (gdb_stdlog, |
3853 | "linux_nat_wait: [%s]\n", target_pid_to_str (ptid)); | |
7feb7d06 PA |
3854 | |
3855 | /* Flush the async file first. */ | |
3856 | if (target_can_async_p ()) | |
3857 | async_file_flush (); | |
3858 | ||
e3e9f5a2 PA |
3859 | /* Resume LWPs that are currently stopped without any pending status |
3860 | to report, but are resumed from the core's perspective. LWPs get | |
3861 | in this state if we find them stopping at a time we're not | |
3862 | interested in reporting the event (target_wait on a | |
3863 | specific_process, for example, see linux_nat_wait_1), and | |
3864 | meanwhile the event became uninteresting. Don't bother resuming | |
3865 | LWPs we're not going to wait for if they'd stop immediately. */ | |
3866 | if (non_stop) | |
3867 | iterate_over_lwps (minus_one_ptid, resume_stopped_resumed_lwps, &ptid); | |
3868 | ||
47608cb1 | 3869 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3870 | |
3871 | /* If we requested any event, and something came out, assume there | |
3872 | may be more. If we requested a specific lwp or process, also | |
3873 | assume there may be more. */ | |
3874 | if (target_can_async_p () | |
3875 | && (ourstatus->kind != TARGET_WAITKIND_IGNORE | |
3876 | || !ptid_equal (ptid, minus_one_ptid))) | |
3877 | async_file_mark (); | |
3878 | ||
3879 | /* Get ready for the next event. */ | |
3880 | if (target_can_async_p ()) | |
3881 | target_async (inferior_event_handler, 0); | |
3882 | ||
3883 | return event_ptid; | |
3884 | } | |
3885 | ||
d6b0e80f AC |
3886 | static int |
3887 | kill_callback (struct lwp_info *lp, void *data) | |
3888 | { | |
ed731959 JK |
3889 | /* PTRACE_KILL may resume the inferior. Send SIGKILL first. */ |
3890 | ||
3891 | errno = 0; | |
3892 | kill (GET_LWP (lp->ptid), SIGKILL); | |
3893 | if (debug_linux_nat) | |
3894 | fprintf_unfiltered (gdb_stdlog, | |
3895 | "KC: kill (SIGKILL) %s, 0, 0 (%s)\n", | |
3896 | target_pid_to_str (lp->ptid), | |
3897 | errno ? safe_strerror (errno) : "OK"); | |
3898 | ||
3899 | /* Some kernels ignore even SIGKILL for processes under ptrace. */ | |
3900 | ||
d6b0e80f AC |
3901 | errno = 0; |
3902 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
3903 | if (debug_linux_nat) | |
3904 | fprintf_unfiltered (gdb_stdlog, | |
3905 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
3906 | target_pid_to_str (lp->ptid), | |
3907 | errno ? safe_strerror (errno) : "OK"); | |
3908 | ||
3909 | return 0; | |
3910 | } | |
3911 | ||
3912 | static int | |
3913 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3914 | { | |
3915 | pid_t pid; | |
3916 | ||
3917 | /* We must make sure that there are no pending events (delayed | |
3918 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3919 | program doesn't interfere with any following debugging session. */ | |
3920 | ||
3921 | /* For cloned processes we must check both with __WCLONE and | |
3922 | without, since the exit status of a cloned process isn't reported | |
3923 | with __WCLONE. */ | |
3924 | if (lp->cloned) | |
3925 | { | |
3926 | do | |
3927 | { | |
58aecb61 | 3928 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 3929 | if (pid != (pid_t) -1) |
d6b0e80f | 3930 | { |
e85a822c DJ |
3931 | if (debug_linux_nat) |
3932 | fprintf_unfiltered (gdb_stdlog, | |
3933 | "KWC: wait %s received unknown.\n", | |
3934 | target_pid_to_str (lp->ptid)); | |
3935 | /* The Linux kernel sometimes fails to kill a thread | |
3936 | completely after PTRACE_KILL; that goes from the stop | |
3937 | point in do_fork out to the one in | |
3938 | get_signal_to_deliever and waits again. So kill it | |
3939 | again. */ | |
3940 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3941 | } |
3942 | } | |
3943 | while (pid == GET_LWP (lp->ptid)); | |
3944 | ||
3945 | gdb_assert (pid == -1 && errno == ECHILD); | |
3946 | } | |
3947 | ||
3948 | do | |
3949 | { | |
58aecb61 | 3950 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 3951 | if (pid != (pid_t) -1) |
d6b0e80f | 3952 | { |
e85a822c DJ |
3953 | if (debug_linux_nat) |
3954 | fprintf_unfiltered (gdb_stdlog, | |
3955 | "KWC: wait %s received unk.\n", | |
3956 | target_pid_to_str (lp->ptid)); | |
3957 | /* See the call to kill_callback above. */ | |
3958 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3959 | } |
3960 | } | |
3961 | while (pid == GET_LWP (lp->ptid)); | |
3962 | ||
3963 | gdb_assert (pid == -1 && errno == ECHILD); | |
3964 | return 0; | |
3965 | } | |
3966 | ||
3967 | static void | |
7d85a9c0 | 3968 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 3969 | { |
f973ed9c DJ |
3970 | struct target_waitstatus last; |
3971 | ptid_t last_ptid; | |
3972 | int status; | |
d6b0e80f | 3973 | |
f973ed9c DJ |
3974 | /* If we're stopped while forking and we haven't followed yet, |
3975 | kill the other task. We need to do this first because the | |
3976 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 3977 | |
f973ed9c | 3978 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 3979 | |
f973ed9c DJ |
3980 | if (last.kind == TARGET_WAITKIND_FORKED |
3981 | || last.kind == TARGET_WAITKIND_VFORKED) | |
3982 | { | |
3a3e9ee3 | 3983 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
3984 | wait (&status); |
3985 | } | |
3986 | ||
3987 | if (forks_exist_p ()) | |
7feb7d06 | 3988 | linux_fork_killall (); |
f973ed9c DJ |
3989 | else |
3990 | { | |
d90e17a7 | 3991 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
e0881a8e | 3992 | |
4c28f408 PA |
3993 | /* Stop all threads before killing them, since ptrace requires |
3994 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 3995 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
3996 | /* ... and wait until all of them have reported back that |
3997 | they're no longer running. */ | |
d90e17a7 | 3998 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 3999 | |
f973ed9c | 4000 | /* Kill all LWP's ... */ |
d90e17a7 | 4001 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
4002 | |
4003 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 4004 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
4005 | } |
4006 | ||
4007 | target_mourn_inferior (); | |
d6b0e80f AC |
4008 | } |
4009 | ||
4010 | static void | |
136d6dae | 4011 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 4012 | { |
d90e17a7 | 4013 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
d6b0e80f | 4014 | |
f973ed9c | 4015 | if (! forks_exist_p ()) |
d90e17a7 PA |
4016 | /* Normal case, no other forks available. */ |
4017 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
4018 | else |
4019 | /* Multi-fork case. The current inferior_ptid has exited, but | |
4020 | there are other viable forks to debug. Delete the exiting | |
4021 | one and context-switch to the first available. */ | |
4022 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
4023 | } |
4024 | ||
5b009018 PA |
4025 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4026 | layout of the inferiors' architecture. */ | |
4027 | ||
4028 | static void | |
4029 | siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction) | |
4030 | { | |
4031 | int done = 0; | |
4032 | ||
4033 | if (linux_nat_siginfo_fixup != NULL) | |
4034 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
4035 | ||
4036 | /* If there was no callback, or the callback didn't do anything, | |
4037 | then just do a straight memcpy. */ | |
4038 | if (!done) | |
4039 | { | |
4040 | if (direction == 1) | |
4041 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
4042 | else | |
4043 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
4044 | } | |
4045 | } | |
4046 | ||
4aa995e1 PA |
4047 | static LONGEST |
4048 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, | |
4049 | const char *annex, gdb_byte *readbuf, | |
4050 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4051 | { | |
4aa995e1 PA |
4052 | int pid; |
4053 | struct siginfo siginfo; | |
5b009018 | 4054 | gdb_byte inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
4055 | |
4056 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
4057 | gdb_assert (readbuf || writebuf); | |
4058 | ||
4059 | pid = GET_LWP (inferior_ptid); | |
4060 | if (pid == 0) | |
4061 | pid = GET_PID (inferior_ptid); | |
4062 | ||
4063 | if (offset > sizeof (siginfo)) | |
4064 | return -1; | |
4065 | ||
4066 | errno = 0; | |
4067 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
4068 | if (errno != 0) | |
4069 | return -1; | |
4070 | ||
5b009018 PA |
4071 | /* When GDB is built as a 64-bit application, ptrace writes into |
4072 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4073 | inferior with a 64-bit GDB should look the same as debugging it | |
4074 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
4075 | the converted layout, so any read/write will have to be done | |
4076 | post-conversion. */ | |
4077 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4078 | ||
4aa995e1 PA |
4079 | if (offset + len > sizeof (siginfo)) |
4080 | len = sizeof (siginfo) - offset; | |
4081 | ||
4082 | if (readbuf != NULL) | |
5b009018 | 4083 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4084 | else |
4085 | { | |
5b009018 PA |
4086 | memcpy (inf_siginfo + offset, writebuf, len); |
4087 | ||
4088 | /* Convert back to ptrace layout before flushing it out. */ | |
4089 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4090 | ||
4aa995e1 PA |
4091 | errno = 0; |
4092 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
4093 | if (errno != 0) | |
4094 | return -1; | |
4095 | } | |
4096 | ||
4097 | return len; | |
4098 | } | |
4099 | ||
10d6c8cd DJ |
4100 | static LONGEST |
4101 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
4102 | const char *annex, gdb_byte *readbuf, | |
4103 | const gdb_byte *writebuf, | |
4104 | ULONGEST offset, LONGEST len) | |
d6b0e80f | 4105 | { |
4aa995e1 | 4106 | struct cleanup *old_chain; |
10d6c8cd | 4107 | LONGEST xfer; |
d6b0e80f | 4108 | |
4aa995e1 PA |
4109 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
4110 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
4111 | offset, len); | |
4112 | ||
c35b1492 PA |
4113 | /* The target is connected but no live inferior is selected. Pass |
4114 | this request down to a lower stratum (e.g., the executable | |
4115 | file). */ | |
4116 | if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid)) | |
4117 | return 0; | |
4118 | ||
4aa995e1 PA |
4119 | old_chain = save_inferior_ptid (); |
4120 | ||
d6b0e80f AC |
4121 | if (is_lwp (inferior_ptid)) |
4122 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
4123 | ||
10d6c8cd DJ |
4124 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
4125 | offset, len); | |
d6b0e80f AC |
4126 | |
4127 | do_cleanups (old_chain); | |
4128 | return xfer; | |
4129 | } | |
4130 | ||
4131 | static int | |
28439f5e | 4132 | linux_thread_alive (ptid_t ptid) |
d6b0e80f | 4133 | { |
8c6a60d1 | 4134 | int err, tmp_errno; |
4c28f408 | 4135 | |
d6b0e80f AC |
4136 | gdb_assert (is_lwp (ptid)); |
4137 | ||
4c28f408 PA |
4138 | /* Send signal 0 instead of anything ptrace, because ptracing a |
4139 | running thread errors out claiming that the thread doesn't | |
4140 | exist. */ | |
4141 | err = kill_lwp (GET_LWP (ptid), 0); | |
8c6a60d1 | 4142 | tmp_errno = errno; |
d6b0e80f AC |
4143 | if (debug_linux_nat) |
4144 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 4145 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 4146 | target_pid_to_str (ptid), |
8c6a60d1 | 4147 | err ? safe_strerror (tmp_errno) : "OK"); |
9c0dd46b | 4148 | |
4c28f408 | 4149 | if (err != 0) |
d6b0e80f AC |
4150 | return 0; |
4151 | ||
4152 | return 1; | |
4153 | } | |
4154 | ||
28439f5e PA |
4155 | static int |
4156 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
4157 | { | |
4158 | return linux_thread_alive (ptid); | |
4159 | } | |
4160 | ||
d6b0e80f | 4161 | static char * |
117de6a9 | 4162 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
4163 | { |
4164 | static char buf[64]; | |
4165 | ||
a0ef4274 | 4166 | if (is_lwp (ptid) |
d90e17a7 PA |
4167 | && (GET_PID (ptid) != GET_LWP (ptid) |
4168 | || num_lwps (GET_PID (ptid)) > 1)) | |
d6b0e80f AC |
4169 | { |
4170 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
4171 | return buf; | |
4172 | } | |
4173 | ||
4174 | return normal_pid_to_str (ptid); | |
4175 | } | |
4176 | ||
4694da01 TT |
4177 | static char * |
4178 | linux_nat_thread_name (struct thread_info *thr) | |
4179 | { | |
4180 | int pid = ptid_get_pid (thr->ptid); | |
4181 | long lwp = ptid_get_lwp (thr->ptid); | |
4182 | #define FORMAT "/proc/%d/task/%ld/comm" | |
4183 | char buf[sizeof (FORMAT) + 30]; | |
4184 | FILE *comm_file; | |
4185 | char *result = NULL; | |
4186 | ||
4187 | snprintf (buf, sizeof (buf), FORMAT, pid, lwp); | |
4188 | comm_file = fopen (buf, "r"); | |
4189 | if (comm_file) | |
4190 | { | |
4191 | /* Not exported by the kernel, so we define it here. */ | |
4192 | #define COMM_LEN 16 | |
4193 | static char line[COMM_LEN + 1]; | |
4194 | ||
4195 | if (fgets (line, sizeof (line), comm_file)) | |
4196 | { | |
4197 | char *nl = strchr (line, '\n'); | |
4198 | ||
4199 | if (nl) | |
4200 | *nl = '\0'; | |
4201 | if (*line != '\0') | |
4202 | result = line; | |
4203 | } | |
4204 | ||
4205 | fclose (comm_file); | |
4206 | } | |
4207 | ||
4208 | #undef COMM_LEN | |
4209 | #undef FORMAT | |
4210 | ||
4211 | return result; | |
4212 | } | |
4213 | ||
dba24537 AC |
4214 | /* Accepts an integer PID; Returns a string representing a file that |
4215 | can be opened to get the symbols for the child process. */ | |
4216 | ||
6d8fd2b7 UW |
4217 | static char * |
4218 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
4219 | { |
4220 | char *name1, *name2; | |
4221 | ||
4222 | name1 = xmalloc (MAXPATHLEN); | |
4223 | name2 = xmalloc (MAXPATHLEN); | |
4224 | make_cleanup (xfree, name1); | |
4225 | make_cleanup (xfree, name2); | |
4226 | memset (name2, 0, MAXPATHLEN); | |
4227 | ||
4228 | sprintf (name1, "/proc/%d/exe", pid); | |
4229 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
4230 | return name2; | |
4231 | else | |
4232 | return name1; | |
4233 | } | |
4234 | ||
4235 | /* Service function for corefiles and info proc. */ | |
4236 | ||
4237 | static int | |
4238 | read_mapping (FILE *mapfile, | |
4239 | long long *addr, | |
4240 | long long *endaddr, | |
4241 | char *permissions, | |
4242 | long long *offset, | |
4243 | char *device, long long *inode, char *filename) | |
4244 | { | |
4245 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
4246 | addr, endaddr, permissions, offset, device, inode); | |
4247 | ||
2e14c2ea MS |
4248 | filename[0] = '\0'; |
4249 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
4250 | { |
4251 | /* Eat everything up to EOL for the filename. This will prevent | |
4252 | weird filenames (such as one with embedded whitespace) from | |
4253 | confusing this code. It also makes this code more robust in | |
4254 | respect to annotations the kernel may add after the filename. | |
4255 | ||
4256 | Note the filename is used for informational purposes | |
4257 | only. */ | |
4258 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
4259 | } | |
2e14c2ea | 4260 | |
dba24537 AC |
4261 | return (ret != 0 && ret != EOF); |
4262 | } | |
4263 | ||
4264 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
4265 | regions in the inferior for a corefile. */ | |
4266 | ||
4267 | static int | |
b8edc417 | 4268 | linux_nat_find_memory_regions (find_memory_region_ftype func, void *obfd) |
dba24537 | 4269 | { |
89ecc4f5 | 4270 | int pid = PIDGET (inferior_ptid); |
dba24537 AC |
4271 | char mapsfilename[MAXPATHLEN]; |
4272 | FILE *mapsfile; | |
4273 | long long addr, endaddr, size, offset, inode; | |
4274 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
4275 | int read, write, exec; | |
7c8a8b04 | 4276 | struct cleanup *cleanup; |
dba24537 AC |
4277 | |
4278 | /* Compose the filename for the /proc memory map, and open it. */ | |
89ecc4f5 | 4279 | sprintf (mapsfilename, "/proc/%d/maps", pid); |
dba24537 | 4280 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) |
8a3fe4f8 | 4281 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 4282 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
4283 | |
4284 | if (info_verbose) | |
4285 | fprintf_filtered (gdb_stdout, | |
4286 | "Reading memory regions from %s\n", mapsfilename); | |
4287 | ||
4288 | /* Now iterate until end-of-file. */ | |
4289 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
4290 | &offset, &device[0], &inode, &filename[0])) | |
4291 | { | |
4292 | size = endaddr - addr; | |
4293 | ||
4294 | /* Get the segment's permissions. */ | |
4295 | read = (strchr (permissions, 'r') != 0); | |
4296 | write = (strchr (permissions, 'w') != 0); | |
4297 | exec = (strchr (permissions, 'x') != 0); | |
4298 | ||
4299 | if (info_verbose) | |
4300 | { | |
4301 | fprintf_filtered (gdb_stdout, | |
2244ba2e PM |
4302 | "Save segment, %s bytes at %s (%c%c%c)", |
4303 | plongest (size), paddress (target_gdbarch, addr), | |
dba24537 AC |
4304 | read ? 'r' : ' ', |
4305 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 4306 | if (filename[0]) |
dba24537 AC |
4307 | fprintf_filtered (gdb_stdout, " for %s", filename); |
4308 | fprintf_filtered (gdb_stdout, "\n"); | |
4309 | } | |
4310 | ||
4311 | /* Invoke the callback function to create the corefile | |
4312 | segment. */ | |
4313 | func (addr, size, read, write, exec, obfd); | |
4314 | } | |
7c8a8b04 | 4315 | do_cleanups (cleanup); |
dba24537 AC |
4316 | return 0; |
4317 | } | |
4318 | ||
2020b7ab PA |
4319 | static int |
4320 | find_signalled_thread (struct thread_info *info, void *data) | |
4321 | { | |
16c381f0 | 4322 | if (info->suspend.stop_signal != TARGET_SIGNAL_0 |
2020b7ab PA |
4323 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) |
4324 | return 1; | |
4325 | ||
4326 | return 0; | |
4327 | } | |
4328 | ||
4329 | static enum target_signal | |
4330 | find_stop_signal (void) | |
4331 | { | |
4332 | struct thread_info *info = | |
4333 | iterate_over_threads (find_signalled_thread, NULL); | |
4334 | ||
4335 | if (info) | |
16c381f0 | 4336 | return info->suspend.stop_signal; |
2020b7ab PA |
4337 | else |
4338 | return TARGET_SIGNAL_0; | |
4339 | } | |
4340 | ||
dba24537 AC |
4341 | /* Records the thread's register state for the corefile note |
4342 | section. */ | |
4343 | ||
4344 | static char * | |
4345 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
4346 | char *note_data, int *note_size, |
4347 | enum target_signal stop_signal) | |
dba24537 | 4348 | { |
dba24537 | 4349 | unsigned long lwp = ptid_get_lwp (ptid); |
c2250ad1 UW |
4350 | struct gdbarch *gdbarch = target_gdbarch; |
4351 | struct regcache *regcache = get_thread_arch_regcache (ptid, gdbarch); | |
4f844a66 | 4352 | const struct regset *regset; |
55e969c1 | 4353 | int core_regset_p; |
594f7785 | 4354 | struct cleanup *old_chain; |
17ea7499 CES |
4355 | struct core_regset_section *sect_list; |
4356 | char *gdb_regset; | |
594f7785 UW |
4357 | |
4358 | old_chain = save_inferior_ptid (); | |
4359 | inferior_ptid = ptid; | |
4360 | target_fetch_registers (regcache, -1); | |
4361 | do_cleanups (old_chain); | |
4f844a66 DM |
4362 | |
4363 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
4364 | sect_list = gdbarch_core_regset_sections (gdbarch); |
4365 | ||
17ea7499 CES |
4366 | /* The loop below uses the new struct core_regset_section, which stores |
4367 | the supported section names and sizes for the core file. Note that | |
4368 | note PRSTATUS needs to be treated specially. But the other notes are | |
4369 | structurally the same, so they can benefit from the new struct. */ | |
4370 | if (core_regset_p && sect_list != NULL) | |
4371 | while (sect_list->sect_name != NULL) | |
4372 | { | |
17ea7499 CES |
4373 | regset = gdbarch_regset_from_core_section (gdbarch, |
4374 | sect_list->sect_name, | |
4375 | sect_list->size); | |
4376 | gdb_assert (regset && regset->collect_regset); | |
4377 | gdb_regset = xmalloc (sect_list->size); | |
4378 | regset->collect_regset (regset, regcache, -1, | |
4379 | gdb_regset, sect_list->size); | |
2f2241f1 UW |
4380 | |
4381 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
4382 | note_data = (char *) elfcore_write_prstatus | |
4383 | (obfd, note_data, note_size, | |
857d11d0 JK |
4384 | lwp, target_signal_to_host (stop_signal), |
4385 | gdb_regset); | |
2f2241f1 UW |
4386 | else |
4387 | note_data = (char *) elfcore_write_register_note | |
4388 | (obfd, note_data, note_size, | |
4389 | sect_list->sect_name, gdb_regset, | |
4390 | sect_list->size); | |
17ea7499 CES |
4391 | xfree (gdb_regset); |
4392 | sect_list++; | |
4393 | } | |
dba24537 | 4394 | |
17ea7499 CES |
4395 | /* For architectures that does not have the struct core_regset_section |
4396 | implemented, we use the old method. When all the architectures have | |
4397 | the new support, the code below should be deleted. */ | |
4f844a66 | 4398 | else |
17ea7499 | 4399 | { |
2f2241f1 UW |
4400 | gdb_gregset_t gregs; |
4401 | gdb_fpregset_t fpregs; | |
4402 | ||
4403 | if (core_regset_p | |
4404 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
3e43a32a MS |
4405 | sizeof (gregs))) |
4406 | != NULL && regset->collect_regset != NULL) | |
2f2241f1 UW |
4407 | regset->collect_regset (regset, regcache, -1, |
4408 | &gregs, sizeof (gregs)); | |
4409 | else | |
4410 | fill_gregset (regcache, &gregs, -1); | |
4411 | ||
857d11d0 JK |
4412 | note_data = (char *) elfcore_write_prstatus |
4413 | (obfd, note_data, note_size, lwp, target_signal_to_host (stop_signal), | |
4414 | &gregs); | |
2f2241f1 | 4415 | |
17ea7499 CES |
4416 | if (core_regset_p |
4417 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
3e43a32a MS |
4418 | sizeof (fpregs))) |
4419 | != NULL && regset->collect_regset != NULL) | |
17ea7499 CES |
4420 | regset->collect_regset (regset, regcache, -1, |
4421 | &fpregs, sizeof (fpregs)); | |
4422 | else | |
4423 | fill_fpregset (regcache, &fpregs, -1); | |
4424 | ||
4425 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
4426 | note_data, | |
4427 | note_size, | |
4428 | &fpregs, sizeof (fpregs)); | |
4429 | } | |
4f844a66 | 4430 | |
dba24537 AC |
4431 | return note_data; |
4432 | } | |
4433 | ||
4434 | struct linux_nat_corefile_thread_data | |
4435 | { | |
4436 | bfd *obfd; | |
4437 | char *note_data; | |
4438 | int *note_size; | |
4439 | int num_notes; | |
2020b7ab | 4440 | enum target_signal stop_signal; |
dba24537 AC |
4441 | }; |
4442 | ||
4443 | /* Called by gdbthread.c once per thread. Records the thread's | |
4444 | register state for the corefile note section. */ | |
4445 | ||
4446 | static int | |
4447 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
4448 | { | |
4449 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 4450 | |
dba24537 AC |
4451 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
4452 | ti->ptid, | |
4453 | args->note_data, | |
2020b7ab PA |
4454 | args->note_size, |
4455 | args->stop_signal); | |
dba24537 | 4456 | args->num_notes++; |
56be3814 | 4457 | |
dba24537 AC |
4458 | return 0; |
4459 | } | |
4460 | ||
efcbbd14 UW |
4461 | /* Enumerate spufs IDs for process PID. */ |
4462 | ||
4463 | static void | |
4464 | iterate_over_spus (int pid, void (*callback) (void *, int), void *data) | |
4465 | { | |
4466 | char path[128]; | |
4467 | DIR *dir; | |
4468 | struct dirent *entry; | |
4469 | ||
4470 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4471 | dir = opendir (path); | |
4472 | if (!dir) | |
4473 | return; | |
4474 | ||
4475 | rewinddir (dir); | |
4476 | while ((entry = readdir (dir)) != NULL) | |
4477 | { | |
4478 | struct stat st; | |
4479 | struct statfs stfs; | |
4480 | int fd; | |
4481 | ||
4482 | fd = atoi (entry->d_name); | |
4483 | if (!fd) | |
4484 | continue; | |
4485 | ||
4486 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4487 | if (stat (path, &st) != 0) | |
4488 | continue; | |
4489 | if (!S_ISDIR (st.st_mode)) | |
4490 | continue; | |
4491 | ||
4492 | if (statfs (path, &stfs) != 0) | |
4493 | continue; | |
4494 | if (stfs.f_type != SPUFS_MAGIC) | |
4495 | continue; | |
4496 | ||
4497 | callback (data, fd); | |
4498 | } | |
4499 | ||
4500 | closedir (dir); | |
4501 | } | |
4502 | ||
4503 | /* Generate corefile notes for SPU contexts. */ | |
4504 | ||
4505 | struct linux_spu_corefile_data | |
4506 | { | |
4507 | bfd *obfd; | |
4508 | char *note_data; | |
4509 | int *note_size; | |
4510 | }; | |
4511 | ||
4512 | static void | |
4513 | linux_spu_corefile_callback (void *data, int fd) | |
4514 | { | |
4515 | struct linux_spu_corefile_data *args = data; | |
4516 | int i; | |
4517 | ||
4518 | static const char *spu_files[] = | |
4519 | { | |
4520 | "object-id", | |
4521 | "mem", | |
4522 | "regs", | |
4523 | "fpcr", | |
4524 | "lslr", | |
4525 | "decr", | |
4526 | "decr_status", | |
4527 | "signal1", | |
4528 | "signal1_type", | |
4529 | "signal2", | |
4530 | "signal2_type", | |
4531 | "event_mask", | |
4532 | "event_status", | |
4533 | "mbox_info", | |
4534 | "ibox_info", | |
4535 | "wbox_info", | |
4536 | "dma_info", | |
4537 | "proxydma_info", | |
4538 | }; | |
4539 | ||
4540 | for (i = 0; i < sizeof (spu_files) / sizeof (spu_files[0]); i++) | |
4541 | { | |
4542 | char annex[32], note_name[32]; | |
4543 | gdb_byte *spu_data; | |
4544 | LONGEST spu_len; | |
4545 | ||
4546 | xsnprintf (annex, sizeof annex, "%d/%s", fd, spu_files[i]); | |
4547 | spu_len = target_read_alloc (¤t_target, TARGET_OBJECT_SPU, | |
4548 | annex, &spu_data); | |
4549 | if (spu_len > 0) | |
4550 | { | |
4551 | xsnprintf (note_name, sizeof note_name, "SPU/%s", annex); | |
4552 | args->note_data = elfcore_write_note (args->obfd, args->note_data, | |
4553 | args->note_size, note_name, | |
4554 | NT_SPU, spu_data, spu_len); | |
4555 | xfree (spu_data); | |
4556 | } | |
4557 | } | |
4558 | } | |
4559 | ||
4560 | static char * | |
4561 | linux_spu_make_corefile_notes (bfd *obfd, char *note_data, int *note_size) | |
4562 | { | |
4563 | struct linux_spu_corefile_data args; | |
e0881a8e | 4564 | |
efcbbd14 UW |
4565 | args.obfd = obfd; |
4566 | args.note_data = note_data; | |
4567 | args.note_size = note_size; | |
4568 | ||
4569 | iterate_over_spus (PIDGET (inferior_ptid), | |
4570 | linux_spu_corefile_callback, &args); | |
4571 | ||
4572 | return args.note_data; | |
4573 | } | |
4574 | ||
dba24537 AC |
4575 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
4576 | section for a corefile, and returns it in a malloc buffer. */ | |
4577 | ||
4578 | static char * | |
4579 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
4580 | { | |
4581 | struct linux_nat_corefile_thread_data thread_args; | |
d99148ef | 4582 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 4583 | char fname[16] = { '\0' }; |
d99148ef | 4584 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
4585 | char psargs[80] = { '\0' }; |
4586 | char *note_data = NULL; | |
d90e17a7 | 4587 | ptid_t filter = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
c6826062 | 4588 | gdb_byte *auxv; |
dba24537 AC |
4589 | int auxv_len; |
4590 | ||
4591 | if (get_exec_file (0)) | |
4592 | { | |
9f37bbcc | 4593 | strncpy (fname, lbasename (get_exec_file (0)), sizeof (fname)); |
dba24537 AC |
4594 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); |
4595 | if (get_inferior_args ()) | |
4596 | { | |
d99148ef JK |
4597 | char *string_end; |
4598 | char *psargs_end = psargs + sizeof (psargs); | |
4599 | ||
4600 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
4601 | strings fine. */ | |
4602 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
4603 | if (string_end != NULL) | |
4604 | { | |
4605 | *string_end++ = ' '; | |
4606 | strncpy (string_end, get_inferior_args (), | |
4607 | psargs_end - string_end); | |
4608 | } | |
dba24537 AC |
4609 | } |
4610 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
4611 | note_data, | |
4612 | note_size, fname, psargs); | |
4613 | } | |
4614 | ||
4615 | /* Dump information for threads. */ | |
4616 | thread_args.obfd = obfd; | |
4617 | thread_args.note_data = note_data; | |
4618 | thread_args.note_size = note_size; | |
4619 | thread_args.num_notes = 0; | |
2020b7ab | 4620 | thread_args.stop_signal = find_stop_signal (); |
d90e17a7 | 4621 | iterate_over_lwps (filter, linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
4622 | gdb_assert (thread_args.num_notes != 0); |
4623 | note_data = thread_args.note_data; | |
dba24537 | 4624 | |
13547ab6 DJ |
4625 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
4626 | NULL, &auxv); | |
dba24537 AC |
4627 | if (auxv_len > 0) |
4628 | { | |
4629 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
4630 | "CORE", NT_AUXV, auxv, auxv_len); | |
4631 | xfree (auxv); | |
4632 | } | |
4633 | ||
efcbbd14 UW |
4634 | note_data = linux_spu_make_corefile_notes (obfd, note_data, note_size); |
4635 | ||
dba24537 AC |
4636 | make_cleanup (xfree, note_data); |
4637 | return note_data; | |
4638 | } | |
4639 | ||
4640 | /* Implement the "info proc" command. */ | |
4641 | ||
4642 | static void | |
4643 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
4644 | { | |
89ecc4f5 DE |
4645 | /* A long is used for pid instead of an int to avoid a loss of precision |
4646 | compiler warning from the output of strtoul. */ | |
4647 | long pid = PIDGET (inferior_ptid); | |
dba24537 AC |
4648 | FILE *procfile; |
4649 | char **argv = NULL; | |
4650 | char buffer[MAXPATHLEN]; | |
4651 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
4652 | int cmdline_f = 1; | |
4653 | int cwd_f = 1; | |
4654 | int exe_f = 1; | |
4655 | int mappings_f = 0; | |
dba24537 AC |
4656 | int status_f = 0; |
4657 | int stat_f = 0; | |
4658 | int all = 0; | |
4659 | struct stat dummy; | |
4660 | ||
4661 | if (args) | |
4662 | { | |
4663 | /* Break up 'args' into an argv array. */ | |
d1a41061 PP |
4664 | argv = gdb_buildargv (args); |
4665 | make_cleanup_freeargv (argv); | |
dba24537 AC |
4666 | } |
4667 | while (argv != NULL && *argv != NULL) | |
4668 | { | |
4669 | if (isdigit (argv[0][0])) | |
4670 | { | |
4671 | pid = strtoul (argv[0], NULL, 10); | |
4672 | } | |
4673 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
4674 | { | |
4675 | mappings_f = 1; | |
4676 | } | |
4677 | else if (strcmp (argv[0], "status") == 0) | |
4678 | { | |
4679 | status_f = 1; | |
4680 | } | |
4681 | else if (strcmp (argv[0], "stat") == 0) | |
4682 | { | |
4683 | stat_f = 1; | |
4684 | } | |
4685 | else if (strcmp (argv[0], "cmd") == 0) | |
4686 | { | |
4687 | cmdline_f = 1; | |
4688 | } | |
4689 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
4690 | { | |
4691 | exe_f = 1; | |
4692 | } | |
4693 | else if (strcmp (argv[0], "cwd") == 0) | |
4694 | { | |
4695 | cwd_f = 1; | |
4696 | } | |
4697 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
4698 | { | |
4699 | all = 1; | |
4700 | } | |
4701 | else | |
4702 | { | |
1777feb0 | 4703 | /* [...] (future options here). */ |
dba24537 AC |
4704 | } |
4705 | argv++; | |
4706 | } | |
4707 | if (pid == 0) | |
8a3fe4f8 | 4708 | error (_("No current process: you must name one.")); |
dba24537 | 4709 | |
89ecc4f5 | 4710 | sprintf (fname1, "/proc/%ld", pid); |
dba24537 | 4711 | if (stat (fname1, &dummy) != 0) |
8a3fe4f8 | 4712 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 4713 | |
89ecc4f5 | 4714 | printf_filtered (_("process %ld\n"), pid); |
dba24537 AC |
4715 | if (cmdline_f || all) |
4716 | { | |
89ecc4f5 | 4717 | sprintf (fname1, "/proc/%ld/cmdline", pid); |
d5d6fca5 | 4718 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4719 | { |
7c8a8b04 | 4720 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
e0881a8e | 4721 | |
bf1d7d9c JB |
4722 | if (fgets (buffer, sizeof (buffer), procfile)) |
4723 | printf_filtered ("cmdline = '%s'\n", buffer); | |
4724 | else | |
4725 | warning (_("unable to read '%s'"), fname1); | |
7c8a8b04 | 4726 | do_cleanups (cleanup); |
dba24537 AC |
4727 | } |
4728 | else | |
8a3fe4f8 | 4729 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4730 | } |
4731 | if (cwd_f || all) | |
4732 | { | |
89ecc4f5 | 4733 | sprintf (fname1, "/proc/%ld/cwd", pid); |
dba24537 AC |
4734 | memset (fname2, 0, sizeof (fname2)); |
4735 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4736 | printf_filtered ("cwd = '%s'\n", fname2); | |
4737 | else | |
8a3fe4f8 | 4738 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4739 | } |
4740 | if (exe_f || all) | |
4741 | { | |
89ecc4f5 | 4742 | sprintf (fname1, "/proc/%ld/exe", pid); |
dba24537 AC |
4743 | memset (fname2, 0, sizeof (fname2)); |
4744 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4745 | printf_filtered ("exe = '%s'\n", fname2); | |
4746 | else | |
8a3fe4f8 | 4747 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4748 | } |
4749 | if (mappings_f || all) | |
4750 | { | |
89ecc4f5 | 4751 | sprintf (fname1, "/proc/%ld/maps", pid); |
d5d6fca5 | 4752 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4753 | { |
4754 | long long addr, endaddr, size, offset, inode; | |
4755 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 4756 | struct cleanup *cleanup; |
dba24537 | 4757 | |
7c8a8b04 | 4758 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 4759 | printf_filtered (_("Mapped address spaces:\n\n")); |
a97b0ac8 | 4760 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4761 | { |
4762 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
4763 | "Start Addr", | |
4764 | " End Addr", | |
4765 | " Size", " Offset", "objfile"); | |
4766 | } | |
4767 | else | |
4768 | { | |
4769 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
4770 | "Start Addr", | |
4771 | " End Addr", | |
4772 | " Size", " Offset", "objfile"); | |
4773 | } | |
4774 | ||
4775 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
4776 | &offset, &device[0], &inode, &filename[0])) | |
4777 | { | |
4778 | size = endaddr - addr; | |
4779 | ||
4780 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
4781 | calls here (and possibly above) should be abstracted | |
4782 | out into their own functions? Andrew suggests using | |
4783 | a generic local_address_string instead to print out | |
4784 | the addresses; that makes sense to me, too. */ | |
4785 | ||
a97b0ac8 | 4786 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4787 | { |
4788 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
4789 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4790 | (unsigned long) endaddr, | |
4791 | (int) size, | |
4792 | (unsigned int) offset, | |
4793 | filename[0] ? filename : ""); | |
4794 | } | |
4795 | else | |
4796 | { | |
4797 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
4798 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4799 | (unsigned long) endaddr, | |
4800 | (int) size, | |
4801 | (unsigned int) offset, | |
4802 | filename[0] ? filename : ""); | |
4803 | } | |
4804 | } | |
4805 | ||
7c8a8b04 | 4806 | do_cleanups (cleanup); |
dba24537 AC |
4807 | } |
4808 | else | |
8a3fe4f8 | 4809 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4810 | } |
4811 | if (status_f || all) | |
4812 | { | |
89ecc4f5 | 4813 | sprintf (fname1, "/proc/%ld/status", pid); |
d5d6fca5 | 4814 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4815 | { |
7c8a8b04 | 4816 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
e0881a8e | 4817 | |
dba24537 AC |
4818 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
4819 | puts_filtered (buffer); | |
7c8a8b04 | 4820 | do_cleanups (cleanup); |
dba24537 AC |
4821 | } |
4822 | else | |
8a3fe4f8 | 4823 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4824 | } |
4825 | if (stat_f || all) | |
4826 | { | |
89ecc4f5 | 4827 | sprintf (fname1, "/proc/%ld/stat", pid); |
d5d6fca5 | 4828 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4829 | { |
4830 | int itmp; | |
4831 | char ctmp; | |
a25694b4 | 4832 | long ltmp; |
7c8a8b04 | 4833 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4834 | |
4835 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 4836 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 4837 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 4838 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 4839 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 4840 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 4841 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4842 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 4843 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4844 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 4845 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4846 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 4847 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4848 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 4849 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4850 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
4851 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4852 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
4853 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4854 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
4855 | (unsigned long) ltmp); | |
4856 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4857 | printf_filtered (_("Minor faults, children: %lu\n"), | |
4858 | (unsigned long) ltmp); | |
4859 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4860 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
4861 | (unsigned long) ltmp); | |
4862 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4863 | printf_filtered (_("Major faults, children: %lu\n"), | |
4864 | (unsigned long) ltmp); | |
4865 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4866 | printf_filtered (_("utime: %ld\n"), ltmp); | |
4867 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4868 | printf_filtered (_("stime: %ld\n"), ltmp); | |
4869 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4870 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
4871 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4872 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
4873 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3e43a32a MS |
4874 | printf_filtered (_("jiffies remaining in current " |
4875 | "time slice: %ld\n"), ltmp); | |
a25694b4 AS |
4876 | if (fscanf (procfile, "%ld ", <mp) > 0) |
4877 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
4878 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4879 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
4880 | (unsigned long) ltmp); | |
4881 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4882 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
4883 | (unsigned long) ltmp); | |
4884 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3e43a32a MS |
4885 | printf_filtered (_("start time (jiffies since " |
4886 | "system boot): %ld\n"), ltmp); | |
a25694b4 AS |
4887 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4888 | printf_filtered (_("Virtual memory size: %lu\n"), | |
4889 | (unsigned long) ltmp); | |
4890 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3e43a32a MS |
4891 | printf_filtered (_("Resident set size: %lu\n"), |
4892 | (unsigned long) ltmp); | |
a25694b4 AS |
4893 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4894 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
4895 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4896 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
4897 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4898 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
4899 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4900 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
3e43a32a MS |
4901 | #if 0 /* Don't know how architecture-dependent the rest is... |
4902 | Anyway the signal bitmap info is available from "status". */ | |
1777feb0 | 4903 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 | 4904 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); |
1777feb0 | 4905 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 AS |
4906 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); |
4907 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4908 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
4909 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4910 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
4911 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4912 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
4913 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4914 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
1777feb0 | 4915 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 | 4916 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); |
dba24537 | 4917 | #endif |
7c8a8b04 | 4918 | do_cleanups (cleanup); |
dba24537 AC |
4919 | } |
4920 | else | |
8a3fe4f8 | 4921 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4922 | } |
4923 | } | |
4924 | ||
10d6c8cd DJ |
4925 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
4926 | filesystem. Because we can use a single read() call for /proc, this | |
4927 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
4928 | but it doesn't support writes. */ | |
4929 | ||
4930 | static LONGEST | |
4931 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
4932 | const char *annex, gdb_byte *readbuf, | |
4933 | const gdb_byte *writebuf, | |
4934 | ULONGEST offset, LONGEST len) | |
dba24537 | 4935 | { |
10d6c8cd DJ |
4936 | LONGEST ret; |
4937 | int fd; | |
dba24537 AC |
4938 | char filename[64]; |
4939 | ||
10d6c8cd | 4940 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
4941 | return 0; |
4942 | ||
4943 | /* Don't bother for one word. */ | |
4944 | if (len < 3 * sizeof (long)) | |
4945 | return 0; | |
4946 | ||
4947 | /* We could keep this file open and cache it - possibly one per | |
4948 | thread. That requires some juggling, but is even faster. */ | |
4949 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
4950 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
4951 | if (fd == -1) | |
4952 | return 0; | |
4953 | ||
4954 | /* If pread64 is available, use it. It's faster if the kernel | |
4955 | supports it (only one syscall), and it's 64-bit safe even on | |
4956 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4957 | application). */ | |
4958 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 4959 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 4960 | #else |
10d6c8cd | 4961 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
4962 | #endif |
4963 | ret = 0; | |
4964 | else | |
4965 | ret = len; | |
4966 | ||
4967 | close (fd); | |
4968 | return ret; | |
4969 | } | |
4970 | ||
efcbbd14 UW |
4971 | |
4972 | /* Enumerate spufs IDs for process PID. */ | |
4973 | static LONGEST | |
4974 | spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, LONGEST len) | |
4975 | { | |
4976 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
4977 | LONGEST pos = 0; | |
4978 | LONGEST written = 0; | |
4979 | char path[128]; | |
4980 | DIR *dir; | |
4981 | struct dirent *entry; | |
4982 | ||
4983 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4984 | dir = opendir (path); | |
4985 | if (!dir) | |
4986 | return -1; | |
4987 | ||
4988 | rewinddir (dir); | |
4989 | while ((entry = readdir (dir)) != NULL) | |
4990 | { | |
4991 | struct stat st; | |
4992 | struct statfs stfs; | |
4993 | int fd; | |
4994 | ||
4995 | fd = atoi (entry->d_name); | |
4996 | if (!fd) | |
4997 | continue; | |
4998 | ||
4999 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
5000 | if (stat (path, &st) != 0) | |
5001 | continue; | |
5002 | if (!S_ISDIR (st.st_mode)) | |
5003 | continue; | |
5004 | ||
5005 | if (statfs (path, &stfs) != 0) | |
5006 | continue; | |
5007 | if (stfs.f_type != SPUFS_MAGIC) | |
5008 | continue; | |
5009 | ||
5010 | if (pos >= offset && pos + 4 <= offset + len) | |
5011 | { | |
5012 | store_unsigned_integer (buf + pos - offset, 4, byte_order, fd); | |
5013 | written += 4; | |
5014 | } | |
5015 | pos += 4; | |
5016 | } | |
5017 | ||
5018 | closedir (dir); | |
5019 | return written; | |
5020 | } | |
5021 | ||
5022 | /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5023 | object type, using the /proc file system. */ | |
5024 | static LONGEST | |
5025 | linux_proc_xfer_spu (struct target_ops *ops, enum target_object object, | |
5026 | const char *annex, gdb_byte *readbuf, | |
5027 | const gdb_byte *writebuf, | |
5028 | ULONGEST offset, LONGEST len) | |
5029 | { | |
5030 | char buf[128]; | |
5031 | int fd = 0; | |
5032 | int ret = -1; | |
5033 | int pid = PIDGET (inferior_ptid); | |
5034 | ||
5035 | if (!annex) | |
5036 | { | |
5037 | if (!readbuf) | |
5038 | return -1; | |
5039 | else | |
5040 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5041 | } | |
5042 | ||
5043 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
5044 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5045 | if (fd <= 0) | |
5046 | return -1; | |
5047 | ||
5048 | if (offset != 0 | |
5049 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5050 | { | |
5051 | close (fd); | |
5052 | return 0; | |
5053 | } | |
5054 | ||
5055 | if (writebuf) | |
5056 | ret = write (fd, writebuf, (size_t) len); | |
5057 | else if (readbuf) | |
5058 | ret = read (fd, readbuf, (size_t) len); | |
5059 | ||
5060 | close (fd); | |
5061 | return ret; | |
5062 | } | |
5063 | ||
5064 | ||
dba24537 AC |
5065 | /* Parse LINE as a signal set and add its set bits to SIGS. */ |
5066 | ||
5067 | static void | |
5068 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
5069 | { | |
5070 | int len = strlen (line) - 1; | |
5071 | const char *p; | |
5072 | int signum; | |
5073 | ||
5074 | if (line[len] != '\n') | |
8a3fe4f8 | 5075 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
5076 | |
5077 | p = line; | |
5078 | signum = len * 4; | |
5079 | while (len-- > 0) | |
5080 | { | |
5081 | int digit; | |
5082 | ||
5083 | if (*p >= '0' && *p <= '9') | |
5084 | digit = *p - '0'; | |
5085 | else if (*p >= 'a' && *p <= 'f') | |
5086 | digit = *p - 'a' + 10; | |
5087 | else | |
8a3fe4f8 | 5088 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
5089 | |
5090 | signum -= 4; | |
5091 | ||
5092 | if (digit & 1) | |
5093 | sigaddset (sigs, signum + 1); | |
5094 | if (digit & 2) | |
5095 | sigaddset (sigs, signum + 2); | |
5096 | if (digit & 4) | |
5097 | sigaddset (sigs, signum + 3); | |
5098 | if (digit & 8) | |
5099 | sigaddset (sigs, signum + 4); | |
5100 | ||
5101 | p++; | |
5102 | } | |
5103 | } | |
5104 | ||
5105 | /* Find process PID's pending signals from /proc/pid/status and set | |
5106 | SIGS to match. */ | |
5107 | ||
5108 | void | |
3e43a32a MS |
5109 | linux_proc_pending_signals (int pid, sigset_t *pending, |
5110 | sigset_t *blocked, sigset_t *ignored) | |
dba24537 AC |
5111 | { |
5112 | FILE *procfile; | |
5113 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
7c8a8b04 | 5114 | struct cleanup *cleanup; |
dba24537 AC |
5115 | |
5116 | sigemptyset (pending); | |
5117 | sigemptyset (blocked); | |
5118 | sigemptyset (ignored); | |
5119 | sprintf (fname, "/proc/%d/status", pid); | |
5120 | procfile = fopen (fname, "r"); | |
5121 | if (procfile == NULL) | |
8a3fe4f8 | 5122 | error (_("Could not open %s"), fname); |
7c8a8b04 | 5123 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
5124 | |
5125 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
5126 | { | |
5127 | /* Normal queued signals are on the SigPnd line in the status | |
5128 | file. However, 2.6 kernels also have a "shared" pending | |
5129 | queue for delivering signals to a thread group, so check for | |
5130 | a ShdPnd line also. | |
5131 | ||
5132 | Unfortunately some Red Hat kernels include the shared pending | |
5133 | queue but not the ShdPnd status field. */ | |
5134 | ||
5135 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
5136 | add_line_to_sigset (buffer + 8, pending); | |
5137 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
5138 | add_line_to_sigset (buffer + 8, pending); | |
5139 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
5140 | add_line_to_sigset (buffer + 8, blocked); | |
5141 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
5142 | add_line_to_sigset (buffer + 8, ignored); | |
5143 | } | |
5144 | ||
7c8a8b04 | 5145 | do_cleanups (cleanup); |
dba24537 AC |
5146 | } |
5147 | ||
07e059b5 VP |
5148 | static LONGEST |
5149 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
e0881a8e MS |
5150 | const char *annex, gdb_byte *readbuf, |
5151 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
07e059b5 | 5152 | { |
07e059b5 VP |
5153 | gdb_assert (object == TARGET_OBJECT_OSDATA); |
5154 | ||
d26e3629 | 5155 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5156 | } |
5157 | ||
10d6c8cd DJ |
5158 | static LONGEST |
5159 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
5160 | const char *annex, gdb_byte *readbuf, | |
5161 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
5162 | { | |
5163 | LONGEST xfer; | |
5164 | ||
5165 | if (object == TARGET_OBJECT_AUXV) | |
9f2982ff | 5166 | return memory_xfer_auxv (ops, object, annex, readbuf, writebuf, |
10d6c8cd DJ |
5167 | offset, len); |
5168 | ||
07e059b5 VP |
5169 | if (object == TARGET_OBJECT_OSDATA) |
5170 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
5171 | offset, len); | |
5172 | ||
efcbbd14 UW |
5173 | if (object == TARGET_OBJECT_SPU) |
5174 | return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf, | |
5175 | offset, len); | |
5176 | ||
8f313923 JK |
5177 | /* GDB calculates all the addresses in possibly larget width of the address. |
5178 | Address width needs to be masked before its final use - either by | |
5179 | linux_proc_xfer_partial or inf_ptrace_xfer_partial. | |
5180 | ||
5181 | Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */ | |
5182 | ||
5183 | if (object == TARGET_OBJECT_MEMORY) | |
5184 | { | |
5185 | int addr_bit = gdbarch_addr_bit (target_gdbarch); | |
5186 | ||
5187 | if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT)) | |
5188 | offset &= ((ULONGEST) 1 << addr_bit) - 1; | |
5189 | } | |
5190 | ||
10d6c8cd DJ |
5191 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
5192 | offset, len); | |
5193 | if (xfer != 0) | |
5194 | return xfer; | |
5195 | ||
5196 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
5197 | offset, len); | |
5198 | } | |
5199 | ||
e9efe249 | 5200 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
5201 | it with local methods. */ |
5202 | ||
910122bf UW |
5203 | static void |
5204 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 5205 | { |
6d8fd2b7 | 5206 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
eb73ad13 | 5207 | t->to_remove_fork_catchpoint = linux_child_remove_fork_catchpoint; |
6d8fd2b7 | 5208 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; |
eb73ad13 | 5209 | t->to_remove_vfork_catchpoint = linux_child_remove_vfork_catchpoint; |
6d8fd2b7 | 5210 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; |
eb73ad13 | 5211 | t->to_remove_exec_catchpoint = linux_child_remove_exec_catchpoint; |
a96d9b2e | 5212 | t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint; |
6d8fd2b7 | 5213 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; |
10d6c8cd | 5214 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
5215 | t->to_post_attach = linux_child_post_attach; |
5216 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
5217 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
5218 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
5219 | ||
5220 | super_xfer_partial = t->to_xfer_partial; | |
5221 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
5222 | } |
5223 | ||
5224 | struct target_ops * | |
5225 | linux_target (void) | |
5226 | { | |
5227 | struct target_ops *t; | |
5228 | ||
5229 | t = inf_ptrace_target (); | |
5230 | linux_target_install_ops (t); | |
5231 | ||
5232 | return t; | |
5233 | } | |
5234 | ||
5235 | struct target_ops * | |
7714d83a | 5236 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
5237 | { |
5238 | struct target_ops *t; | |
5239 | ||
5240 | t = inf_ptrace_trad_target (register_u_offset); | |
5241 | linux_target_install_ops (t); | |
10d6c8cd | 5242 | |
10d6c8cd DJ |
5243 | return t; |
5244 | } | |
5245 | ||
b84876c2 PA |
5246 | /* target_is_async_p implementation. */ |
5247 | ||
5248 | static int | |
5249 | linux_nat_is_async_p (void) | |
5250 | { | |
5251 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5252 | it explicitly with the "set target-async" command. |
b84876c2 | 5253 | Someday, linux will always be async. */ |
3dd5b83d | 5254 | return target_async_permitted; |
b84876c2 PA |
5255 | } |
5256 | ||
5257 | /* target_can_async_p implementation. */ | |
5258 | ||
5259 | static int | |
5260 | linux_nat_can_async_p (void) | |
5261 | { | |
5262 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5263 | it explicitly with the "set target-async" command. |
b84876c2 | 5264 | Someday, linux will always be async. */ |
3dd5b83d | 5265 | return target_async_permitted; |
b84876c2 PA |
5266 | } |
5267 | ||
9908b566 VP |
5268 | static int |
5269 | linux_nat_supports_non_stop (void) | |
5270 | { | |
5271 | return 1; | |
5272 | } | |
5273 | ||
d90e17a7 PA |
5274 | /* True if we want to support multi-process. To be removed when GDB |
5275 | supports multi-exec. */ | |
5276 | ||
2277426b | 5277 | int linux_multi_process = 1; |
d90e17a7 PA |
5278 | |
5279 | static int | |
5280 | linux_nat_supports_multi_process (void) | |
5281 | { | |
5282 | return linux_multi_process; | |
5283 | } | |
5284 | ||
03583c20 UW |
5285 | static int |
5286 | linux_nat_supports_disable_randomization (void) | |
5287 | { | |
5288 | #ifdef HAVE_PERSONALITY | |
5289 | return 1; | |
5290 | #else | |
5291 | return 0; | |
5292 | #endif | |
5293 | } | |
5294 | ||
b84876c2 PA |
5295 | static int async_terminal_is_ours = 1; |
5296 | ||
5297 | /* target_terminal_inferior implementation. */ | |
5298 | ||
5299 | static void | |
5300 | linux_nat_terminal_inferior (void) | |
5301 | { | |
5302 | if (!target_is_async_p ()) | |
5303 | { | |
5304 | /* Async mode is disabled. */ | |
5305 | terminal_inferior (); | |
5306 | return; | |
5307 | } | |
5308 | ||
b84876c2 PA |
5309 | terminal_inferior (); |
5310 | ||
d9d2d8b6 | 5311 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
5312 | if (!async_terminal_is_ours) |
5313 | return; | |
5314 | ||
5315 | delete_file_handler (input_fd); | |
5316 | async_terminal_is_ours = 0; | |
5317 | set_sigint_trap (); | |
5318 | } | |
5319 | ||
5320 | /* target_terminal_ours implementation. */ | |
5321 | ||
2c0b251b | 5322 | static void |
b84876c2 PA |
5323 | linux_nat_terminal_ours (void) |
5324 | { | |
5325 | if (!target_is_async_p ()) | |
5326 | { | |
5327 | /* Async mode is disabled. */ | |
5328 | terminal_ours (); | |
5329 | return; | |
5330 | } | |
5331 | ||
5332 | /* GDB should never give the terminal to the inferior if the | |
5333 | inferior is running in the background (run&, continue&, etc.), | |
5334 | but claiming it sure should. */ | |
5335 | terminal_ours (); | |
5336 | ||
b84876c2 PA |
5337 | if (async_terminal_is_ours) |
5338 | return; | |
5339 | ||
5340 | clear_sigint_trap (); | |
5341 | add_file_handler (input_fd, stdin_event_handler, 0); | |
5342 | async_terminal_is_ours = 1; | |
5343 | } | |
5344 | ||
5345 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
5346 | void *context); | |
5347 | static void *async_client_context; | |
5348 | ||
7feb7d06 PA |
5349 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5350 | so we notice when any child changes state, and notify the | |
5351 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
5352 | above to wait for the arrival of a SIGCHLD. */ | |
5353 | ||
b84876c2 | 5354 | static void |
7feb7d06 | 5355 | sigchld_handler (int signo) |
b84876c2 | 5356 | { |
7feb7d06 PA |
5357 | int old_errno = errno; |
5358 | ||
01124a23 DE |
5359 | if (debug_linux_nat) |
5360 | ui_file_write_async_safe (gdb_stdlog, | |
5361 | "sigchld\n", sizeof ("sigchld\n") - 1); | |
7feb7d06 PA |
5362 | |
5363 | if (signo == SIGCHLD | |
5364 | && linux_nat_event_pipe[0] != -1) | |
5365 | async_file_mark (); /* Let the event loop know that there are | |
5366 | events to handle. */ | |
5367 | ||
5368 | errno = old_errno; | |
5369 | } | |
5370 | ||
5371 | /* Callback registered with the target events file descriptor. */ | |
5372 | ||
5373 | static void | |
5374 | handle_target_event (int error, gdb_client_data client_data) | |
5375 | { | |
5376 | (*async_client_callback) (INF_REG_EVENT, async_client_context); | |
5377 | } | |
5378 | ||
5379 | /* Create/destroy the target events pipe. Returns previous state. */ | |
5380 | ||
5381 | static int | |
5382 | linux_async_pipe (int enable) | |
5383 | { | |
5384 | int previous = (linux_nat_event_pipe[0] != -1); | |
5385 | ||
5386 | if (previous != enable) | |
5387 | { | |
5388 | sigset_t prev_mask; | |
5389 | ||
5390 | block_child_signals (&prev_mask); | |
5391 | ||
5392 | if (enable) | |
5393 | { | |
5394 | if (pipe (linux_nat_event_pipe) == -1) | |
5395 | internal_error (__FILE__, __LINE__, | |
5396 | "creating event pipe failed."); | |
5397 | ||
5398 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5399 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5400 | } | |
5401 | else | |
5402 | { | |
5403 | close (linux_nat_event_pipe[0]); | |
5404 | close (linux_nat_event_pipe[1]); | |
5405 | linux_nat_event_pipe[0] = -1; | |
5406 | linux_nat_event_pipe[1] = -1; | |
5407 | } | |
5408 | ||
5409 | restore_child_signals_mask (&prev_mask); | |
5410 | } | |
5411 | ||
5412 | return previous; | |
b84876c2 PA |
5413 | } |
5414 | ||
5415 | /* target_async implementation. */ | |
5416 | ||
5417 | static void | |
5418 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
5419 | void *context), void *context) | |
5420 | { | |
b84876c2 PA |
5421 | if (callback != NULL) |
5422 | { | |
5423 | async_client_callback = callback; | |
5424 | async_client_context = context; | |
7feb7d06 PA |
5425 | if (!linux_async_pipe (1)) |
5426 | { | |
5427 | add_file_handler (linux_nat_event_pipe[0], | |
5428 | handle_target_event, NULL); | |
5429 | /* There may be pending events to handle. Tell the event loop | |
5430 | to poll them. */ | |
5431 | async_file_mark (); | |
5432 | } | |
b84876c2 PA |
5433 | } |
5434 | else | |
5435 | { | |
5436 | async_client_callback = callback; | |
5437 | async_client_context = context; | |
b84876c2 | 5438 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 5439 | linux_async_pipe (0); |
b84876c2 PA |
5440 | } |
5441 | return; | |
5442 | } | |
5443 | ||
252fbfc8 PA |
5444 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
5445 | event came out. */ | |
5446 | ||
4c28f408 | 5447 | static int |
252fbfc8 | 5448 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 5449 | { |
d90e17a7 | 5450 | if (!lwp->stopped) |
252fbfc8 | 5451 | { |
d90e17a7 | 5452 | ptid_t ptid = lwp->ptid; |
252fbfc8 | 5453 | |
d90e17a7 PA |
5454 | if (debug_linux_nat) |
5455 | fprintf_unfiltered (gdb_stdlog, | |
5456 | "LNSL: running -> suspending %s\n", | |
5457 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 5458 | |
252fbfc8 | 5459 | |
25289eb2 PA |
5460 | if (lwp->last_resume_kind == resume_stop) |
5461 | { | |
5462 | if (debug_linux_nat) | |
5463 | fprintf_unfiltered (gdb_stdlog, | |
5464 | "linux-nat: already stopping LWP %ld at " | |
5465 | "GDB's request\n", | |
5466 | ptid_get_lwp (lwp->ptid)); | |
5467 | return 0; | |
5468 | } | |
252fbfc8 | 5469 | |
25289eb2 PA |
5470 | stop_callback (lwp, NULL); |
5471 | lwp->last_resume_kind = resume_stop; | |
d90e17a7 PA |
5472 | } |
5473 | else | |
5474 | { | |
5475 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 5476 | |
d90e17a7 PA |
5477 | if (debug_linux_nat) |
5478 | { | |
e09875d4 | 5479 | if (find_thread_ptid (lwp->ptid)->stop_requested) |
3e43a32a MS |
5480 | fprintf_unfiltered (gdb_stdlog, |
5481 | "LNSL: already stopped/stop_requested %s\n", | |
d90e17a7 PA |
5482 | target_pid_to_str (lwp->ptid)); |
5483 | else | |
3e43a32a MS |
5484 | fprintf_unfiltered (gdb_stdlog, |
5485 | "LNSL: already stopped/no " | |
5486 | "stop_requested yet %s\n", | |
d90e17a7 | 5487 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
5488 | } |
5489 | } | |
4c28f408 PA |
5490 | return 0; |
5491 | } | |
5492 | ||
5493 | static void | |
5494 | linux_nat_stop (ptid_t ptid) | |
5495 | { | |
5496 | if (non_stop) | |
d90e17a7 | 5497 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4c28f408 PA |
5498 | else |
5499 | linux_ops->to_stop (ptid); | |
5500 | } | |
5501 | ||
d90e17a7 PA |
5502 | static void |
5503 | linux_nat_close (int quitting) | |
5504 | { | |
5505 | /* Unregister from the event loop. */ | |
5506 | if (target_is_async_p ()) | |
5507 | target_async (NULL, 0); | |
5508 | ||
d90e17a7 PA |
5509 | if (linux_ops->to_close) |
5510 | linux_ops->to_close (quitting); | |
5511 | } | |
5512 | ||
c0694254 PA |
5513 | /* When requests are passed down from the linux-nat layer to the |
5514 | single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are | |
5515 | used. The address space pointer is stored in the inferior object, | |
5516 | but the common code that is passed such ptid can't tell whether | |
5517 | lwpid is a "main" process id or not (it assumes so). We reverse | |
5518 | look up the "main" process id from the lwp here. */ | |
5519 | ||
5520 | struct address_space * | |
5521 | linux_nat_thread_address_space (struct target_ops *t, ptid_t ptid) | |
5522 | { | |
5523 | struct lwp_info *lwp; | |
5524 | struct inferior *inf; | |
5525 | int pid; | |
5526 | ||
5527 | pid = GET_LWP (ptid); | |
5528 | if (GET_LWP (ptid) == 0) | |
5529 | { | |
5530 | /* An (lwpid,0,0) ptid. Look up the lwp object to get at the | |
5531 | tgid. */ | |
5532 | lwp = find_lwp_pid (ptid); | |
5533 | pid = GET_PID (lwp->ptid); | |
5534 | } | |
5535 | else | |
5536 | { | |
5537 | /* A (pid,lwpid,0) ptid. */ | |
5538 | pid = GET_PID (ptid); | |
5539 | } | |
5540 | ||
5541 | inf = find_inferior_pid (pid); | |
5542 | gdb_assert (inf != NULL); | |
5543 | return inf->aspace; | |
5544 | } | |
5545 | ||
dc146f7c VP |
5546 | int |
5547 | linux_nat_core_of_thread_1 (ptid_t ptid) | |
5548 | { | |
5549 | struct cleanup *back_to; | |
5550 | char *filename; | |
5551 | FILE *f; | |
5552 | char *content = NULL; | |
5553 | char *p; | |
5554 | char *ts = 0; | |
5555 | int content_read = 0; | |
5556 | int i; | |
5557 | int core; | |
5558 | ||
5559 | filename = xstrprintf ("/proc/%d/task/%ld/stat", | |
5560 | GET_PID (ptid), GET_LWP (ptid)); | |
5561 | back_to = make_cleanup (xfree, filename); | |
5562 | ||
5563 | f = fopen (filename, "r"); | |
5564 | if (!f) | |
5565 | { | |
5566 | do_cleanups (back_to); | |
5567 | return -1; | |
5568 | } | |
5569 | ||
5570 | make_cleanup_fclose (f); | |
5571 | ||
5572 | for (;;) | |
5573 | { | |
5574 | int n; | |
e0881a8e | 5575 | |
dc146f7c VP |
5576 | content = xrealloc (content, content_read + 1024); |
5577 | n = fread (content + content_read, 1, 1024, f); | |
5578 | content_read += n; | |
5579 | if (n < 1024) | |
5580 | { | |
5581 | content[content_read] = '\0'; | |
5582 | break; | |
5583 | } | |
5584 | } | |
5585 | ||
5586 | make_cleanup (xfree, content); | |
5587 | ||
5588 | p = strchr (content, '('); | |
ca2a87a0 JK |
5589 | |
5590 | /* Skip ")". */ | |
5591 | if (p != NULL) | |
5592 | p = strchr (p, ')'); | |
5593 | if (p != NULL) | |
5594 | p++; | |
dc146f7c VP |
5595 | |
5596 | /* If the first field after program name has index 0, then core number is | |
5597 | the field with index 36. There's no constant for that anywhere. */ | |
ca2a87a0 JK |
5598 | if (p != NULL) |
5599 | p = strtok_r (p, " ", &ts); | |
5600 | for (i = 0; p != NULL && i != 36; ++i) | |
dc146f7c VP |
5601 | p = strtok_r (NULL, " ", &ts); |
5602 | ||
ca2a87a0 | 5603 | if (p == NULL || sscanf (p, "%d", &core) == 0) |
dc146f7c VP |
5604 | core = -1; |
5605 | ||
5606 | do_cleanups (back_to); | |
5607 | ||
5608 | return core; | |
5609 | } | |
5610 | ||
5611 | /* Return the cached value of the processor core for thread PTID. */ | |
5612 | ||
5613 | int | |
5614 | linux_nat_core_of_thread (struct target_ops *ops, ptid_t ptid) | |
5615 | { | |
5616 | struct lwp_info *info = find_lwp_pid (ptid); | |
e0881a8e | 5617 | |
dc146f7c VP |
5618 | if (info) |
5619 | return info->core; | |
5620 | return -1; | |
5621 | } | |
5622 | ||
f973ed9c DJ |
5623 | void |
5624 | linux_nat_add_target (struct target_ops *t) | |
5625 | { | |
f973ed9c DJ |
5626 | /* Save the provided single-threaded target. We save this in a separate |
5627 | variable because another target we've inherited from (e.g. inf-ptrace) | |
5628 | may have saved a pointer to T; we want to use it for the final | |
5629 | process stratum target. */ | |
5630 | linux_ops_saved = *t; | |
5631 | linux_ops = &linux_ops_saved; | |
5632 | ||
5633 | /* Override some methods for multithreading. */ | |
b84876c2 | 5634 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
5635 | t->to_attach = linux_nat_attach; |
5636 | t->to_detach = linux_nat_detach; | |
5637 | t->to_resume = linux_nat_resume; | |
5638 | t->to_wait = linux_nat_wait; | |
2455069d | 5639 | t->to_pass_signals = linux_nat_pass_signals; |
f973ed9c DJ |
5640 | t->to_xfer_partial = linux_nat_xfer_partial; |
5641 | t->to_kill = linux_nat_kill; | |
5642 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
5643 | t->to_thread_alive = linux_nat_thread_alive; | |
5644 | t->to_pid_to_str = linux_nat_pid_to_str; | |
4694da01 | 5645 | t->to_thread_name = linux_nat_thread_name; |
f973ed9c | 5646 | t->to_has_thread_control = tc_schedlock; |
c0694254 | 5647 | t->to_thread_address_space = linux_nat_thread_address_space; |
ebec9a0f PA |
5648 | t->to_stopped_by_watchpoint = linux_nat_stopped_by_watchpoint; |
5649 | t->to_stopped_data_address = linux_nat_stopped_data_address; | |
f973ed9c | 5650 | |
b84876c2 PA |
5651 | t->to_can_async_p = linux_nat_can_async_p; |
5652 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 5653 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 | 5654 | t->to_async = linux_nat_async; |
b84876c2 PA |
5655 | t->to_terminal_inferior = linux_nat_terminal_inferior; |
5656 | t->to_terminal_ours = linux_nat_terminal_ours; | |
d90e17a7 | 5657 | t->to_close = linux_nat_close; |
b84876c2 | 5658 | |
4c28f408 PA |
5659 | /* Methods for non-stop support. */ |
5660 | t->to_stop = linux_nat_stop; | |
5661 | ||
d90e17a7 PA |
5662 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
5663 | ||
03583c20 UW |
5664 | t->to_supports_disable_randomization |
5665 | = linux_nat_supports_disable_randomization; | |
5666 | ||
dc146f7c VP |
5667 | t->to_core_of_thread = linux_nat_core_of_thread; |
5668 | ||
f973ed9c DJ |
5669 | /* We don't change the stratum; this target will sit at |
5670 | process_stratum and thread_db will set at thread_stratum. This | |
5671 | is a little strange, since this is a multi-threaded-capable | |
5672 | target, but we want to be on the stack below thread_db, and we | |
5673 | also want to be used for single-threaded processes. */ | |
5674 | ||
5675 | add_target (t); | |
f973ed9c DJ |
5676 | } |
5677 | ||
9f0bdab8 DJ |
5678 | /* Register a method to call whenever a new thread is attached. */ |
5679 | void | |
5680 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
5681 | { | |
5682 | /* Save the pointer. We only support a single registered instance | |
5683 | of the GNU/Linux native target, so we do not need to map this to | |
5684 | T. */ | |
5685 | linux_nat_new_thread = new_thread; | |
5686 | } | |
5687 | ||
5b009018 PA |
5688 | /* Register a method that converts a siginfo object between the layout |
5689 | that ptrace returns, and the layout in the architecture of the | |
5690 | inferior. */ | |
5691 | void | |
5692 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
5693 | int (*siginfo_fixup) (struct siginfo *, | |
5694 | gdb_byte *, | |
5695 | int)) | |
5696 | { | |
5697 | /* Save the pointer. */ | |
5698 | linux_nat_siginfo_fixup = siginfo_fixup; | |
5699 | } | |
5700 | ||
9f0bdab8 DJ |
5701 | /* Return the saved siginfo associated with PTID. */ |
5702 | struct siginfo * | |
5703 | linux_nat_get_siginfo (ptid_t ptid) | |
5704 | { | |
5705 | struct lwp_info *lp = find_lwp_pid (ptid); | |
5706 | ||
5707 | gdb_assert (lp != NULL); | |
5708 | ||
5709 | return &lp->siginfo; | |
5710 | } | |
5711 | ||
2c0b251b PA |
5712 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
5713 | extern initialize_file_ftype _initialize_linux_nat; | |
5714 | ||
d6b0e80f AC |
5715 | void |
5716 | _initialize_linux_nat (void) | |
5717 | { | |
1bedd215 AC |
5718 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
5719 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
5720 | Specify any process id, or use the program being debugged by default.\n\ |
5721 | Specify any of the following keywords for detailed info:\n\ | |
5722 | mappings -- list of mapped memory regions.\n\ | |
5723 | stat -- list a bunch of random process info.\n\ | |
5724 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 5725 | all -- list all available /proc info.")); |
d6b0e80f | 5726 | |
b84876c2 PA |
5727 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
5728 | &debug_linux_nat, _("\ | |
5729 | Set debugging of GNU/Linux lwp module."), _("\ | |
5730 | Show debugging of GNU/Linux lwp module."), _("\ | |
5731 | Enables printf debugging output."), | |
5732 | NULL, | |
5733 | show_debug_linux_nat, | |
5734 | &setdebuglist, &showdebuglist); | |
5735 | ||
b84876c2 | 5736 | /* Save this mask as the default. */ |
d6b0e80f AC |
5737 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
5738 | ||
7feb7d06 PA |
5739 | /* Install a SIGCHLD handler. */ |
5740 | sigchld_action.sa_handler = sigchld_handler; | |
5741 | sigemptyset (&sigchld_action.sa_mask); | |
5742 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
5743 | |
5744 | /* Make it the default. */ | |
7feb7d06 | 5745 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
5746 | |
5747 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
5748 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
5749 | sigdelset (&suspend_mask, SIGCHLD); | |
5750 | ||
7feb7d06 | 5751 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
5752 | } |
5753 | \f | |
5754 | ||
5755 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
5756 | the GNU/Linux Threads library and therefore doesn't really belong | |
5757 | here. */ | |
5758 | ||
5759 | /* Read variable NAME in the target and return its value if found. | |
5760 | Otherwise return zero. It is assumed that the type of the variable | |
5761 | is `int'. */ | |
5762 | ||
5763 | static int | |
5764 | get_signo (const char *name) | |
5765 | { | |
5766 | struct minimal_symbol *ms; | |
5767 | int signo; | |
5768 | ||
5769 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
5770 | if (ms == NULL) | |
5771 | return 0; | |
5772 | ||
8e70166d | 5773 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
5774 | sizeof (signo)) != 0) |
5775 | return 0; | |
5776 | ||
5777 | return signo; | |
5778 | } | |
5779 | ||
5780 | /* Return the set of signals used by the threads library in *SET. */ | |
5781 | ||
5782 | void | |
5783 | lin_thread_get_thread_signals (sigset_t *set) | |
5784 | { | |
5785 | struct sigaction action; | |
5786 | int restart, cancel; | |
5787 | ||
b84876c2 | 5788 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
5789 | sigemptyset (set); |
5790 | ||
5791 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
5792 | cancel = get_signo ("__pthread_sig_cancel"); |
5793 | ||
5794 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
5795 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
5796 | not provide any way for the debugger to query the signal numbers - | |
5797 | fortunately they don't change! */ | |
5798 | ||
d6b0e80f | 5799 | if (restart == 0) |
17fbb0bd | 5800 | restart = __SIGRTMIN; |
d6b0e80f | 5801 | |
d6b0e80f | 5802 | if (cancel == 0) |
17fbb0bd | 5803 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
5804 | |
5805 | sigaddset (set, restart); | |
5806 | sigaddset (set, cancel); | |
5807 | ||
5808 | /* The GNU/Linux Threads library makes terminating threads send a | |
5809 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
5810 | those (to prevent them from terminating GDB itself, which is | |
5811 | likely to be their default action) and treat them the same way as | |
5812 | SIGCHLD. */ | |
5813 | ||
5814 | action.sa_handler = sigchld_handler; | |
5815 | sigemptyset (&action.sa_mask); | |
58aecb61 | 5816 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
5817 | sigaction (cancel, &action, NULL); |
5818 | ||
5819 | /* We block the "cancel" signal throughout this code ... */ | |
5820 | sigaddset (&blocked_mask, cancel); | |
5821 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
5822 | ||
5823 | /* ... except during a sigsuspend. */ | |
5824 | sigdelset (&suspend_mask, cancel); | |
5825 | } |