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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 | |
10568435 JK |
203 | static int disable_randomization = 1; |
204 | ||
205 | static void | |
206 | show_disable_randomization (struct ui_file *file, int from_tty, | |
207 | struct cmd_list_element *c, const char *value) | |
208 | { | |
209 | #ifdef HAVE_PERSONALITY | |
3e43a32a MS |
210 | fprintf_filtered (file, |
211 | _("Disabling randomization of debuggee's " | |
212 | "virtual address space is %s.\n"), | |
10568435 JK |
213 | value); |
214 | #else /* !HAVE_PERSONALITY */ | |
3e43a32a MS |
215 | fputs_filtered (_("Disabling randomization of debuggee's " |
216 | "virtual address space is unsupported on\n" | |
217 | "this platform.\n"), file); | |
10568435 JK |
218 | #endif /* !HAVE_PERSONALITY */ |
219 | } | |
220 | ||
221 | static void | |
3e43a32a MS |
222 | set_disable_randomization (char *args, int from_tty, |
223 | struct cmd_list_element *c) | |
10568435 JK |
224 | { |
225 | #ifndef HAVE_PERSONALITY | |
3e43a32a MS |
226 | error (_("Disabling randomization of debuggee's " |
227 | "virtual address space is unsupported on\n" | |
228 | "this platform.")); | |
10568435 JK |
229 | #endif /* !HAVE_PERSONALITY */ |
230 | } | |
231 | ||
ae087d01 DJ |
232 | struct simple_pid_list |
233 | { | |
234 | int pid; | |
3d799a95 | 235 | int status; |
ae087d01 DJ |
236 | struct simple_pid_list *next; |
237 | }; | |
238 | struct simple_pid_list *stopped_pids; | |
239 | ||
3993f6b1 DJ |
240 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
241 | can not be used, 1 if it can. */ | |
242 | ||
243 | static int linux_supports_tracefork_flag = -1; | |
244 | ||
3e43a32a MS |
245 | /* This variable is a tri-state flag: -1 for unknown, 0 if |
246 | PTRACE_O_TRACESYSGOOD can not be used, 1 if it can. */ | |
a96d9b2e SDJ |
247 | |
248 | static int linux_supports_tracesysgood_flag = -1; | |
249 | ||
9016a515 DJ |
250 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
251 | PTRACE_O_TRACEVFORKDONE. */ | |
252 | ||
253 | static int linux_supports_tracevforkdone_flag = -1; | |
254 | ||
a96d9b2e SDJ |
255 | /* Stores the current used ptrace() options. */ |
256 | static int current_ptrace_options = 0; | |
257 | ||
3dd5b83d PA |
258 | /* Async mode support. */ |
259 | ||
b84876c2 PA |
260 | /* The read/write ends of the pipe registered as waitable file in the |
261 | event loop. */ | |
262 | static int linux_nat_event_pipe[2] = { -1, -1 }; | |
263 | ||
7feb7d06 | 264 | /* Flush the event pipe. */ |
b84876c2 | 265 | |
7feb7d06 PA |
266 | static void |
267 | async_file_flush (void) | |
b84876c2 | 268 | { |
7feb7d06 PA |
269 | int ret; |
270 | char buf; | |
b84876c2 | 271 | |
7feb7d06 | 272 | do |
b84876c2 | 273 | { |
7feb7d06 | 274 | ret = read (linux_nat_event_pipe[0], &buf, 1); |
b84876c2 | 275 | } |
7feb7d06 | 276 | while (ret >= 0 || (ret == -1 && errno == EINTR)); |
b84876c2 PA |
277 | } |
278 | ||
7feb7d06 PA |
279 | /* Put something (anything, doesn't matter what, or how much) in event |
280 | pipe, so that the select/poll in the event-loop realizes we have | |
281 | something to process. */ | |
252fbfc8 | 282 | |
b84876c2 | 283 | static void |
7feb7d06 | 284 | async_file_mark (void) |
b84876c2 | 285 | { |
7feb7d06 | 286 | int ret; |
b84876c2 | 287 | |
7feb7d06 PA |
288 | /* It doesn't really matter what the pipe contains, as long we end |
289 | up with something in it. Might as well flush the previous | |
290 | left-overs. */ | |
291 | async_file_flush (); | |
b84876c2 | 292 | |
7feb7d06 | 293 | do |
b84876c2 | 294 | { |
7feb7d06 | 295 | ret = write (linux_nat_event_pipe[1], "+", 1); |
b84876c2 | 296 | } |
7feb7d06 | 297 | while (ret == -1 && errno == EINTR); |
b84876c2 | 298 | |
7feb7d06 PA |
299 | /* Ignore EAGAIN. If the pipe is full, the event loop will already |
300 | be awakened anyway. */ | |
b84876c2 PA |
301 | } |
302 | ||
7feb7d06 | 303 | static void linux_nat_async (void (*callback) |
3e43a32a MS |
304 | (enum inferior_event_type event_type, |
305 | void *context), | |
7feb7d06 | 306 | void *context); |
7feb7d06 PA |
307 | static int kill_lwp (int lwpid, int signo); |
308 | ||
309 | static int stop_callback (struct lwp_info *lp, void *data); | |
310 | ||
311 | static void block_child_signals (sigset_t *prev_mask); | |
312 | static void restore_child_signals_mask (sigset_t *prev_mask); | |
2277426b PA |
313 | |
314 | struct lwp_info; | |
315 | static struct lwp_info *add_lwp (ptid_t ptid); | |
316 | static void purge_lwp_list (int pid); | |
317 | static struct lwp_info *find_lwp_pid (ptid_t ptid); | |
318 | ||
ae087d01 DJ |
319 | \f |
320 | /* Trivial list manipulation functions to keep track of a list of | |
321 | new stopped processes. */ | |
322 | static void | |
3d799a95 | 323 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) |
ae087d01 DJ |
324 | { |
325 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
e0881a8e | 326 | |
ae087d01 | 327 | new_pid->pid = pid; |
3d799a95 | 328 | new_pid->status = status; |
ae087d01 DJ |
329 | new_pid->next = *listp; |
330 | *listp = new_pid; | |
331 | } | |
332 | ||
84636d28 PA |
333 | static int |
334 | in_pid_list_p (struct simple_pid_list *list, int pid) | |
335 | { | |
336 | struct simple_pid_list *p; | |
337 | ||
338 | for (p = list; p != NULL; p = p->next) | |
339 | if (p->pid == pid) | |
340 | return 1; | |
341 | return 0; | |
342 | } | |
343 | ||
ae087d01 | 344 | static int |
46a96992 | 345 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) |
ae087d01 DJ |
346 | { |
347 | struct simple_pid_list **p; | |
348 | ||
349 | for (p = listp; *p != NULL; p = &(*p)->next) | |
350 | if ((*p)->pid == pid) | |
351 | { | |
352 | struct simple_pid_list *next = (*p)->next; | |
e0881a8e | 353 | |
46a96992 | 354 | *statusp = (*p)->status; |
ae087d01 DJ |
355 | xfree (*p); |
356 | *p = next; | |
357 | return 1; | |
358 | } | |
359 | return 0; | |
360 | } | |
361 | ||
3993f6b1 DJ |
362 | \f |
363 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
364 | ||
365 | static void | |
366 | linux_tracefork_child (void) | |
367 | { | |
3993f6b1 DJ |
368 | ptrace (PTRACE_TRACEME, 0, 0, 0); |
369 | kill (getpid (), SIGSTOP); | |
370 | fork (); | |
48bb3cce | 371 | _exit (0); |
3993f6b1 DJ |
372 | } |
373 | ||
7feb7d06 | 374 | /* Wrapper function for waitpid which handles EINTR. */ |
b957e937 DJ |
375 | |
376 | static int | |
46a96992 | 377 | my_waitpid (int pid, int *statusp, int flags) |
b957e937 DJ |
378 | { |
379 | int ret; | |
b84876c2 | 380 | |
b957e937 DJ |
381 | do |
382 | { | |
46a96992 | 383 | ret = waitpid (pid, statusp, flags); |
b957e937 DJ |
384 | } |
385 | while (ret == -1 && errno == EINTR); | |
386 | ||
387 | return ret; | |
388 | } | |
389 | ||
390 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
391 | ||
392 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
393 | we know that the feature is not available. This may change the tracing | |
394 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
395 | ||
396 | However, if it succeeds, we don't know for sure that the feature is | |
397 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 398 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
399 | fork tracing, and let it fork. If the process exits, we assume that we |
400 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
401 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
402 | |
403 | static void | |
b957e937 | 404 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
405 | { |
406 | int child_pid, ret, status; | |
407 | long second_pid; | |
7feb7d06 | 408 | sigset_t prev_mask; |
4c28f408 | 409 | |
7feb7d06 PA |
410 | /* We don't want those ptrace calls to be interrupted. */ |
411 | block_child_signals (&prev_mask); | |
3993f6b1 | 412 | |
b957e937 DJ |
413 | linux_supports_tracefork_flag = 0; |
414 | linux_supports_tracevforkdone_flag = 0; | |
415 | ||
416 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
417 | if (ret != 0) | |
7feb7d06 PA |
418 | { |
419 | restore_child_signals_mask (&prev_mask); | |
420 | return; | |
421 | } | |
b957e937 | 422 | |
3993f6b1 DJ |
423 | child_pid = fork (); |
424 | if (child_pid == -1) | |
e2e0b3e5 | 425 | perror_with_name (("fork")); |
3993f6b1 DJ |
426 | |
427 | if (child_pid == 0) | |
428 | linux_tracefork_child (); | |
429 | ||
b957e937 | 430 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 431 | if (ret == -1) |
e2e0b3e5 | 432 | perror_with_name (("waitpid")); |
3993f6b1 | 433 | else if (ret != child_pid) |
8a3fe4f8 | 434 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 435 | if (! WIFSTOPPED (status)) |
3e43a32a MS |
436 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), |
437 | status); | |
3993f6b1 | 438 | |
3993f6b1 DJ |
439 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
440 | if (ret != 0) | |
441 | { | |
b957e937 DJ |
442 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
443 | if (ret != 0) | |
444 | { | |
8a3fe4f8 | 445 | warning (_("linux_test_for_tracefork: failed to kill child")); |
7feb7d06 | 446 | restore_child_signals_mask (&prev_mask); |
b957e937 DJ |
447 | return; |
448 | } | |
449 | ||
450 | ret = my_waitpid (child_pid, &status, 0); | |
451 | if (ret != child_pid) | |
3e43a32a MS |
452 | warning (_("linux_test_for_tracefork: failed " |
453 | "to wait for killed child")); | |
b957e937 | 454 | else if (!WIFSIGNALED (status)) |
3e43a32a MS |
455 | warning (_("linux_test_for_tracefork: unexpected " |
456 | "wait status 0x%x from killed child"), status); | |
b957e937 | 457 | |
7feb7d06 | 458 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
459 | return; |
460 | } | |
461 | ||
9016a515 DJ |
462 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
463 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
464 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
465 | linux_supports_tracevforkdone_flag = (ret == 0); | |
466 | ||
b957e937 DJ |
467 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
468 | if (ret != 0) | |
8a3fe4f8 | 469 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
470 | |
471 | ret = my_waitpid (child_pid, &status, 0); | |
472 | ||
3993f6b1 DJ |
473 | if (ret == child_pid && WIFSTOPPED (status) |
474 | && status >> 16 == PTRACE_EVENT_FORK) | |
475 | { | |
476 | second_pid = 0; | |
477 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
478 | if (ret == 0 && second_pid != 0) | |
479 | { | |
480 | int second_status; | |
481 | ||
482 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
483 | my_waitpid (second_pid, &second_status, 0); |
484 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
485 | if (ret != 0) | |
3e43a32a MS |
486 | warning (_("linux_test_for_tracefork: " |
487 | "failed to kill second child")); | |
97725dc4 | 488 | my_waitpid (second_pid, &status, 0); |
3993f6b1 DJ |
489 | } |
490 | } | |
b957e937 | 491 | else |
8a3fe4f8 AC |
492 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
493 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 494 | |
b957e937 DJ |
495 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
496 | if (ret != 0) | |
8a3fe4f8 | 497 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 498 | my_waitpid (child_pid, &status, 0); |
4c28f408 | 499 | |
7feb7d06 | 500 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
501 | } |
502 | ||
a96d9b2e SDJ |
503 | /* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls. |
504 | ||
505 | We try to enable syscall tracing on ORIGINAL_PID. If this fails, | |
506 | we know that the feature is not available. This may change the tracing | |
507 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. */ | |
508 | ||
509 | static void | |
510 | linux_test_for_tracesysgood (int original_pid) | |
511 | { | |
512 | int ret; | |
513 | sigset_t prev_mask; | |
514 | ||
515 | /* We don't want those ptrace calls to be interrupted. */ | |
516 | block_child_signals (&prev_mask); | |
517 | ||
518 | linux_supports_tracesysgood_flag = 0; | |
519 | ||
520 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACESYSGOOD); | |
521 | if (ret != 0) | |
522 | goto out; | |
523 | ||
524 | linux_supports_tracesysgood_flag = 1; | |
525 | out: | |
526 | restore_child_signals_mask (&prev_mask); | |
527 | } | |
528 | ||
529 | /* Determine wether we support PTRACE_O_TRACESYSGOOD option available. | |
530 | This function also sets linux_supports_tracesysgood_flag. */ | |
531 | ||
532 | static int | |
533 | linux_supports_tracesysgood (int pid) | |
534 | { | |
535 | if (linux_supports_tracesysgood_flag == -1) | |
536 | linux_test_for_tracesysgood (pid); | |
537 | return linux_supports_tracesysgood_flag; | |
538 | } | |
539 | ||
3993f6b1 DJ |
540 | /* Return non-zero iff we have tracefork functionality available. |
541 | This function also sets linux_supports_tracefork_flag. */ | |
542 | ||
543 | static int | |
b957e937 | 544 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
545 | { |
546 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 547 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
548 | return linux_supports_tracefork_flag; |
549 | } | |
550 | ||
9016a515 | 551 | static int |
b957e937 | 552 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
553 | { |
554 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 555 | linux_test_for_tracefork (pid); |
9016a515 DJ |
556 | return linux_supports_tracevforkdone_flag; |
557 | } | |
558 | ||
a96d9b2e SDJ |
559 | static void |
560 | linux_enable_tracesysgood (ptid_t ptid) | |
561 | { | |
562 | int pid = ptid_get_lwp (ptid); | |
563 | ||
564 | if (pid == 0) | |
565 | pid = ptid_get_pid (ptid); | |
566 | ||
567 | if (linux_supports_tracesysgood (pid) == 0) | |
568 | return; | |
569 | ||
570 | current_ptrace_options |= PTRACE_O_TRACESYSGOOD; | |
571 | ||
572 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); | |
573 | } | |
574 | ||
3993f6b1 | 575 | \f |
4de4c07c DJ |
576 | void |
577 | linux_enable_event_reporting (ptid_t ptid) | |
578 | { | |
d3587048 | 579 | int pid = ptid_get_lwp (ptid); |
4de4c07c | 580 | |
d3587048 DJ |
581 | if (pid == 0) |
582 | pid = ptid_get_pid (ptid); | |
583 | ||
b957e937 | 584 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
585 | return; |
586 | ||
a96d9b2e SDJ |
587 | current_ptrace_options |= PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK |
588 | | PTRACE_O_TRACEEXEC | PTRACE_O_TRACECLONE; | |
589 | ||
b957e937 | 590 | if (linux_supports_tracevforkdone (pid)) |
a96d9b2e | 591 | current_ptrace_options |= PTRACE_O_TRACEVFORKDONE; |
9016a515 DJ |
592 | |
593 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
594 | read-only process state. */ | |
4de4c07c | 595 | |
a96d9b2e | 596 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); |
4de4c07c DJ |
597 | } |
598 | ||
6d8fd2b7 UW |
599 | static void |
600 | linux_child_post_attach (int pid) | |
4de4c07c DJ |
601 | { |
602 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
0ec9a092 | 603 | check_for_thread_db (); |
a96d9b2e | 604 | linux_enable_tracesysgood (pid_to_ptid (pid)); |
4de4c07c DJ |
605 | } |
606 | ||
10d6c8cd | 607 | static void |
4de4c07c DJ |
608 | linux_child_post_startup_inferior (ptid_t ptid) |
609 | { | |
610 | linux_enable_event_reporting (ptid); | |
0ec9a092 | 611 | check_for_thread_db (); |
a96d9b2e | 612 | linux_enable_tracesysgood (ptid); |
4de4c07c DJ |
613 | } |
614 | ||
6d8fd2b7 UW |
615 | static int |
616 | linux_child_follow_fork (struct target_ops *ops, int follow_child) | |
3993f6b1 | 617 | { |
7feb7d06 | 618 | sigset_t prev_mask; |
9016a515 | 619 | int has_vforked; |
4de4c07c DJ |
620 | int parent_pid, child_pid; |
621 | ||
7feb7d06 | 622 | block_child_signals (&prev_mask); |
b84876c2 | 623 | |
e58b0e63 PA |
624 | has_vforked = (inferior_thread ()->pending_follow.kind |
625 | == TARGET_WAITKIND_VFORKED); | |
626 | parent_pid = ptid_get_lwp (inferior_ptid); | |
d3587048 | 627 | if (parent_pid == 0) |
e58b0e63 PA |
628 | parent_pid = ptid_get_pid (inferior_ptid); |
629 | child_pid = PIDGET (inferior_thread ()->pending_follow.value.related_pid); | |
4de4c07c | 630 | |
2277426b PA |
631 | if (!detach_fork) |
632 | linux_enable_event_reporting (pid_to_ptid (child_pid)); | |
633 | ||
6c95b8df PA |
634 | if (has_vforked |
635 | && !non_stop /* Non-stop always resumes both branches. */ | |
636 | && (!target_is_async_p () || sync_execution) | |
637 | && !(follow_child || detach_fork || sched_multi)) | |
638 | { | |
639 | /* The parent stays blocked inside the vfork syscall until the | |
640 | child execs or exits. If we don't let the child run, then | |
641 | the parent stays blocked. If we're telling the parent to run | |
642 | in the foreground, the user will not be able to ctrl-c to get | |
643 | back the terminal, effectively hanging the debug session. */ | |
ac74f770 MS |
644 | fprintf_filtered (gdb_stderr, _("\ |
645 | Can not resume the parent process over vfork in the foreground while\n\ | |
646 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
647 | \"set schedule-multiple\".\n")); | |
648 | /* FIXME output string > 80 columns. */ | |
6c95b8df PA |
649 | return 1; |
650 | } | |
651 | ||
4de4c07c DJ |
652 | if (! follow_child) |
653 | { | |
6c95b8df | 654 | struct lwp_info *child_lp = NULL; |
4de4c07c | 655 | |
1777feb0 | 656 | /* We're already attached to the parent, by default. */ |
4de4c07c | 657 | |
ac264b3b MS |
658 | /* Detach new forked process? */ |
659 | if (detach_fork) | |
f75c00e4 | 660 | { |
6c95b8df PA |
661 | /* Before detaching from the child, remove all breakpoints |
662 | from it. If we forked, then this has already been taken | |
663 | care of by infrun.c. If we vforked however, any | |
664 | breakpoint inserted in the parent is visible in the | |
665 | child, even those added while stopped in a vfork | |
666 | catchpoint. This will remove the breakpoints from the | |
667 | parent also, but they'll be reinserted below. */ | |
668 | if (has_vforked) | |
669 | { | |
670 | /* keep breakpoints list in sync. */ | |
671 | remove_breakpoints_pid (GET_PID (inferior_ptid)); | |
672 | } | |
673 | ||
e85a822c | 674 | if (info_verbose || debug_linux_nat) |
ac264b3b MS |
675 | { |
676 | target_terminal_ours (); | |
677 | fprintf_filtered (gdb_stdlog, | |
3e43a32a MS |
678 | "Detaching after fork from " |
679 | "child process %d.\n", | |
ac264b3b MS |
680 | child_pid); |
681 | } | |
4de4c07c | 682 | |
ac264b3b MS |
683 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
684 | } | |
685 | else | |
686 | { | |
77435e4c | 687 | struct inferior *parent_inf, *child_inf; |
2277426b | 688 | struct cleanup *old_chain; |
7f9f62ba PA |
689 | |
690 | /* Add process to GDB's tables. */ | |
77435e4c PA |
691 | child_inf = add_inferior (child_pid); |
692 | ||
e58b0e63 | 693 | parent_inf = current_inferior (); |
77435e4c | 694 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 695 | copy_terminal_info (child_inf, parent_inf); |
7f9f62ba | 696 | |
2277426b | 697 | old_chain = save_inferior_ptid (); |
6c95b8df | 698 | save_current_program_space (); |
2277426b PA |
699 | |
700 | inferior_ptid = ptid_build (child_pid, child_pid, 0); | |
701 | add_thread (inferior_ptid); | |
6c95b8df PA |
702 | child_lp = add_lwp (inferior_ptid); |
703 | child_lp->stopped = 1; | |
25289eb2 | 704 | child_lp->last_resume_kind = resume_stop; |
2277426b | 705 | |
6c95b8df PA |
706 | /* If this is a vfork child, then the address-space is |
707 | shared with the parent. */ | |
708 | if (has_vforked) | |
709 | { | |
710 | child_inf->pspace = parent_inf->pspace; | |
711 | child_inf->aspace = parent_inf->aspace; | |
712 | ||
713 | /* The parent will be frozen until the child is done | |
714 | with the shared region. Keep track of the | |
715 | parent. */ | |
716 | child_inf->vfork_parent = parent_inf; | |
717 | child_inf->pending_detach = 0; | |
718 | parent_inf->vfork_child = child_inf; | |
719 | parent_inf->pending_detach = 0; | |
720 | } | |
721 | else | |
722 | { | |
723 | child_inf->aspace = new_address_space (); | |
724 | child_inf->pspace = add_program_space (child_inf->aspace); | |
725 | child_inf->removable = 1; | |
726 | set_current_program_space (child_inf->pspace); | |
727 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
728 | ||
729 | /* Let the shared library layer (solib-svr4) learn about | |
730 | this new process, relocate the cloned exec, pull in | |
731 | shared libraries, and install the solib event | |
732 | breakpoint. If a "cloned-VM" event was propagated | |
733 | better throughout the core, this wouldn't be | |
734 | required. */ | |
268a4a75 | 735 | solib_create_inferior_hook (0); |
6c95b8df PA |
736 | } |
737 | ||
738 | /* Let the thread_db layer learn about this new process. */ | |
2277426b PA |
739 | check_for_thread_db (); |
740 | ||
741 | do_cleanups (old_chain); | |
ac264b3b | 742 | } |
9016a515 DJ |
743 | |
744 | if (has_vforked) | |
745 | { | |
3ced3da4 | 746 | struct lwp_info *parent_lp; |
6c95b8df PA |
747 | struct inferior *parent_inf; |
748 | ||
749 | parent_inf = current_inferior (); | |
750 | ||
751 | /* If we detached from the child, then we have to be careful | |
752 | to not insert breakpoints in the parent until the child | |
753 | is done with the shared memory region. However, if we're | |
754 | staying attached to the child, then we can and should | |
755 | insert breakpoints, so that we can debug it. A | |
756 | subsequent child exec or exit is enough to know when does | |
757 | the child stops using the parent's address space. */ | |
758 | parent_inf->waiting_for_vfork_done = detach_fork; | |
56710373 | 759 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; |
6c95b8df | 760 | |
3ced3da4 | 761 | parent_lp = find_lwp_pid (pid_to_ptid (parent_pid)); |
b957e937 | 762 | gdb_assert (linux_supports_tracefork_flag >= 0); |
3ced3da4 | 763 | |
b957e937 | 764 | if (linux_supports_tracevforkdone (0)) |
9016a515 | 765 | { |
6c95b8df PA |
766 | if (debug_linux_nat) |
767 | fprintf_unfiltered (gdb_stdlog, | |
768 | "LCFF: waiting for VFORK_DONE on %d\n", | |
769 | parent_pid); | |
3ced3da4 | 770 | parent_lp->stopped = 1; |
9016a515 | 771 | |
6c95b8df PA |
772 | /* We'll handle the VFORK_DONE event like any other |
773 | event, in target_wait. */ | |
9016a515 DJ |
774 | } |
775 | else | |
776 | { | |
777 | /* We can't insert breakpoints until the child has | |
778 | finished with the shared memory region. We need to | |
779 | wait until that happens. Ideal would be to just | |
780 | call: | |
781 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
782 | - waitpid (parent_pid, &status, __WALL); | |
783 | However, most architectures can't handle a syscall | |
784 | being traced on the way out if it wasn't traced on | |
785 | the way in. | |
786 | ||
787 | We might also think to loop, continuing the child | |
788 | until it exits or gets a SIGTRAP. One problem is | |
789 | that the child might call ptrace with PTRACE_TRACEME. | |
790 | ||
791 | There's no simple and reliable way to figure out when | |
792 | the vforked child will be done with its copy of the | |
793 | shared memory. We could step it out of the syscall, | |
794 | two instructions, let it go, and then single-step the | |
795 | parent once. When we have hardware single-step, this | |
796 | would work; with software single-step it could still | |
797 | be made to work but we'd have to be able to insert | |
798 | single-step breakpoints in the child, and we'd have | |
799 | to insert -just- the single-step breakpoint in the | |
800 | parent. Very awkward. | |
801 | ||
802 | In the end, the best we can do is to make sure it | |
803 | runs for a little while. Hopefully it will be out of | |
804 | range of any breakpoints we reinsert. Usually this | |
805 | is only the single-step breakpoint at vfork's return | |
806 | point. */ | |
807 | ||
6c95b8df PA |
808 | if (debug_linux_nat) |
809 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
810 | "LCFF: no VFORK_DONE " |
811 | "support, sleeping a bit\n"); | |
6c95b8df | 812 | |
9016a515 | 813 | usleep (10000); |
9016a515 | 814 | |
6c95b8df PA |
815 | /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event, |
816 | and leave it pending. The next linux_nat_resume call | |
817 | will notice a pending event, and bypasses actually | |
818 | resuming the inferior. */ | |
3ced3da4 PA |
819 | parent_lp->status = 0; |
820 | parent_lp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
821 | parent_lp->stopped = 1; | |
6c95b8df PA |
822 | |
823 | /* If we're in async mode, need to tell the event loop | |
824 | there's something here to process. */ | |
825 | if (target_can_async_p ()) | |
826 | async_file_mark (); | |
827 | } | |
9016a515 | 828 | } |
4de4c07c | 829 | } |
3993f6b1 | 830 | else |
4de4c07c | 831 | { |
77435e4c | 832 | struct inferior *parent_inf, *child_inf; |
3ced3da4 | 833 | struct lwp_info *child_lp; |
6c95b8df | 834 | struct program_space *parent_pspace; |
4de4c07c | 835 | |
e85a822c | 836 | if (info_verbose || debug_linux_nat) |
f75c00e4 DJ |
837 | { |
838 | target_terminal_ours (); | |
6c95b8df | 839 | if (has_vforked) |
3e43a32a MS |
840 | fprintf_filtered (gdb_stdlog, |
841 | _("Attaching after process %d " | |
842 | "vfork to child process %d.\n"), | |
6c95b8df PA |
843 | parent_pid, child_pid); |
844 | else | |
3e43a32a MS |
845 | fprintf_filtered (gdb_stdlog, |
846 | _("Attaching after process %d " | |
847 | "fork to child process %d.\n"), | |
6c95b8df | 848 | parent_pid, child_pid); |
f75c00e4 | 849 | } |
4de4c07c | 850 | |
7a7d3353 PA |
851 | /* Add the new inferior first, so that the target_detach below |
852 | doesn't unpush the target. */ | |
853 | ||
77435e4c PA |
854 | child_inf = add_inferior (child_pid); |
855 | ||
e58b0e63 | 856 | parent_inf = current_inferior (); |
77435e4c | 857 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 858 | copy_terminal_info (child_inf, parent_inf); |
7a7d3353 | 859 | |
6c95b8df | 860 | parent_pspace = parent_inf->pspace; |
9016a515 | 861 | |
6c95b8df PA |
862 | /* If we're vforking, we want to hold on to the parent until the |
863 | child exits or execs. At child exec or exit time we can | |
864 | remove the old breakpoints from the parent and detach or | |
865 | resume debugging it. Otherwise, detach the parent now; we'll | |
866 | want to reuse it's program/address spaces, but we can't set | |
867 | them to the child before removing breakpoints from the | |
868 | parent, otherwise, the breakpoints module could decide to | |
869 | remove breakpoints from the wrong process (since they'd be | |
870 | assigned to the same address space). */ | |
9016a515 DJ |
871 | |
872 | if (has_vforked) | |
7f9f62ba | 873 | { |
6c95b8df PA |
874 | gdb_assert (child_inf->vfork_parent == NULL); |
875 | gdb_assert (parent_inf->vfork_child == NULL); | |
876 | child_inf->vfork_parent = parent_inf; | |
877 | child_inf->pending_detach = 0; | |
878 | parent_inf->vfork_child = child_inf; | |
879 | parent_inf->pending_detach = detach_fork; | |
880 | parent_inf->waiting_for_vfork_done = 0; | |
ac264b3b | 881 | } |
2277426b | 882 | else if (detach_fork) |
b84876c2 | 883 | target_detach (NULL, 0); |
4de4c07c | 884 | |
6c95b8df PA |
885 | /* Note that the detach above makes PARENT_INF dangling. */ |
886 | ||
887 | /* Add the child thread to the appropriate lists, and switch to | |
888 | this new thread, before cloning the program space, and | |
889 | informing the solib layer about this new process. */ | |
890 | ||
9f0bdab8 | 891 | inferior_ptid = ptid_build (child_pid, child_pid, 0); |
2277426b | 892 | add_thread (inferior_ptid); |
3ced3da4 PA |
893 | child_lp = add_lwp (inferior_ptid); |
894 | child_lp->stopped = 1; | |
25289eb2 | 895 | child_lp->last_resume_kind = resume_stop; |
6c95b8df PA |
896 | |
897 | /* If this is a vfork child, then the address-space is shared | |
898 | with the parent. If we detached from the parent, then we can | |
899 | reuse the parent's program/address spaces. */ | |
900 | if (has_vforked || detach_fork) | |
901 | { | |
902 | child_inf->pspace = parent_pspace; | |
903 | child_inf->aspace = child_inf->pspace->aspace; | |
904 | } | |
905 | else | |
906 | { | |
907 | child_inf->aspace = new_address_space (); | |
908 | child_inf->pspace = add_program_space (child_inf->aspace); | |
909 | child_inf->removable = 1; | |
910 | set_current_program_space (child_inf->pspace); | |
911 | clone_program_space (child_inf->pspace, parent_pspace); | |
912 | ||
913 | /* Let the shared library layer (solib-svr4) learn about | |
914 | this new process, relocate the cloned exec, pull in | |
915 | shared libraries, and install the solib event breakpoint. | |
916 | If a "cloned-VM" event was propagated better throughout | |
917 | the core, this wouldn't be required. */ | |
268a4a75 | 918 | solib_create_inferior_hook (0); |
6c95b8df | 919 | } |
ac264b3b | 920 | |
6c95b8df | 921 | /* Let the thread_db layer learn about this new process. */ |
ef29ce1a | 922 | check_for_thread_db (); |
4de4c07c DJ |
923 | } |
924 | ||
7feb7d06 | 925 | restore_child_signals_mask (&prev_mask); |
4de4c07c DJ |
926 | return 0; |
927 | } | |
928 | ||
4de4c07c | 929 | \f |
77b06cd7 | 930 | static int |
6d8fd2b7 | 931 | linux_child_insert_fork_catchpoint (int pid) |
4de4c07c | 932 | { |
77b06cd7 | 933 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
934 | } |
935 | ||
eb73ad13 PA |
936 | static int |
937 | linux_child_remove_fork_catchpoint (int pid) | |
938 | { | |
939 | return 0; | |
940 | } | |
941 | ||
77b06cd7 | 942 | static int |
6d8fd2b7 | 943 | linux_child_insert_vfork_catchpoint (int pid) |
3993f6b1 | 944 | { |
77b06cd7 | 945 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
946 | } |
947 | ||
eb73ad13 PA |
948 | static int |
949 | linux_child_remove_vfork_catchpoint (int pid) | |
950 | { | |
951 | return 0; | |
952 | } | |
953 | ||
77b06cd7 | 954 | static int |
6d8fd2b7 | 955 | linux_child_insert_exec_catchpoint (int pid) |
3993f6b1 | 956 | { |
77b06cd7 | 957 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
958 | } |
959 | ||
eb73ad13 PA |
960 | static int |
961 | linux_child_remove_exec_catchpoint (int pid) | |
962 | { | |
963 | return 0; | |
964 | } | |
965 | ||
a96d9b2e SDJ |
966 | static int |
967 | linux_child_set_syscall_catchpoint (int pid, int needed, int any_count, | |
968 | int table_size, int *table) | |
969 | { | |
77b06cd7 TJB |
970 | if (!linux_supports_tracesysgood (pid)) |
971 | return 1; | |
972 | ||
a96d9b2e SDJ |
973 | /* On GNU/Linux, we ignore the arguments. It means that we only |
974 | enable the syscall catchpoints, but do not disable them. | |
77b06cd7 | 975 | |
a96d9b2e SDJ |
976 | Also, we do not use the `table' information because we do not |
977 | filter system calls here. We let GDB do the logic for us. */ | |
978 | return 0; | |
979 | } | |
980 | ||
d6b0e80f AC |
981 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's |
982 | are processes sharing the same VM space. A multi-threaded process | |
983 | is basically a group of such processes. However, such a grouping | |
984 | is almost entirely a user-space issue; the kernel doesn't enforce | |
985 | such a grouping at all (this might change in the future). In | |
986 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
987 | Threads library) to provide such a grouping. | |
988 | ||
989 | It is perfectly well possible to write a multi-threaded application | |
990 | without the assistance of a threads library, by using the clone | |
991 | system call directly. This module should be able to give some | |
992 | rudimentary support for debugging such applications if developers | |
993 | specify the CLONE_PTRACE flag in the clone system call, and are | |
994 | using the Linux kernel 2.4 or above. | |
995 | ||
996 | Note that there are some peculiarities in GNU/Linux that affect | |
997 | this code: | |
998 | ||
999 | - In general one should specify the __WCLONE flag to waitpid in | |
1000 | order to make it report events for any of the cloned processes | |
1001 | (and leave it out for the initial process). However, if a cloned | |
1002 | process has exited the exit status is only reported if the | |
1003 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
1004 | we cannot use it since GDB must work on older systems too. | |
1005 | ||
1006 | - When a traced, cloned process exits and is waited for by the | |
1007 | debugger, the kernel reassigns it to the original parent and | |
1008 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
1009 | library doesn't notice this, which leads to the "zombie problem": | |
1010 | When debugged a multi-threaded process that spawns a lot of | |
1011 | threads will run out of processes, even if the threads exit, | |
1012 | because the "zombies" stay around. */ | |
1013 | ||
1014 | /* List of known LWPs. */ | |
9f0bdab8 | 1015 | struct lwp_info *lwp_list; |
d6b0e80f AC |
1016 | \f |
1017 | ||
d6b0e80f AC |
1018 | /* Original signal mask. */ |
1019 | static sigset_t normal_mask; | |
1020 | ||
1021 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
1022 | _initialize_linux_nat. */ | |
1023 | static sigset_t suspend_mask; | |
1024 | ||
7feb7d06 PA |
1025 | /* Signals to block to make that sigsuspend work. */ |
1026 | static sigset_t blocked_mask; | |
1027 | ||
1028 | /* SIGCHLD action. */ | |
1029 | struct sigaction sigchld_action; | |
b84876c2 | 1030 | |
7feb7d06 PA |
1031 | /* Block child signals (SIGCHLD and linux threads signals), and store |
1032 | the previous mask in PREV_MASK. */ | |
84e46146 | 1033 | |
7feb7d06 PA |
1034 | static void |
1035 | block_child_signals (sigset_t *prev_mask) | |
1036 | { | |
1037 | /* Make sure SIGCHLD is blocked. */ | |
1038 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
1039 | sigaddset (&blocked_mask, SIGCHLD); | |
1040 | ||
1041 | sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask); | |
1042 | } | |
1043 | ||
1044 | /* Restore child signals mask, previously returned by | |
1045 | block_child_signals. */ | |
1046 | ||
1047 | static void | |
1048 | restore_child_signals_mask (sigset_t *prev_mask) | |
1049 | { | |
1050 | sigprocmask (SIG_SETMASK, prev_mask, NULL); | |
1051 | } | |
2455069d UW |
1052 | |
1053 | /* Mask of signals to pass directly to the inferior. */ | |
1054 | static sigset_t pass_mask; | |
1055 | ||
1056 | /* Update signals to pass to the inferior. */ | |
1057 | static void | |
1058 | linux_nat_pass_signals (int numsigs, unsigned char *pass_signals) | |
1059 | { | |
1060 | int signo; | |
1061 | ||
1062 | sigemptyset (&pass_mask); | |
1063 | ||
1064 | for (signo = 1; signo < NSIG; signo++) | |
1065 | { | |
1066 | int target_signo = target_signal_from_host (signo); | |
1067 | if (target_signo < numsigs && pass_signals[target_signo]) | |
1068 | sigaddset (&pass_mask, signo); | |
1069 | } | |
1070 | } | |
1071 | ||
d6b0e80f AC |
1072 | \f |
1073 | ||
1074 | /* Prototypes for local functions. */ | |
1075 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
28439f5e | 1076 | static int linux_thread_alive (ptid_t ptid); |
6d8fd2b7 | 1077 | static char *linux_child_pid_to_exec_file (int pid); |
710151dd | 1078 | |
d6b0e80f AC |
1079 | \f |
1080 | /* Convert wait status STATUS to a string. Used for printing debug | |
1081 | messages only. */ | |
1082 | ||
1083 | static char * | |
1084 | status_to_str (int status) | |
1085 | { | |
1086 | static char buf[64]; | |
1087 | ||
1088 | if (WIFSTOPPED (status)) | |
206aa767 | 1089 | { |
ca2163eb | 1090 | if (WSTOPSIG (status) == SYSCALL_SIGTRAP) |
206aa767 DE |
1091 | snprintf (buf, sizeof (buf), "%s (stopped at syscall)", |
1092 | strsignal (SIGTRAP)); | |
1093 | else | |
1094 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
1095 | strsignal (WSTOPSIG (status))); | |
1096 | } | |
d6b0e80f AC |
1097 | else if (WIFSIGNALED (status)) |
1098 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
ba9b2ec3 | 1099 | strsignal (WTERMSIG (status))); |
d6b0e80f AC |
1100 | else |
1101 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
1102 | ||
1103 | return buf; | |
1104 | } | |
1105 | ||
d90e17a7 PA |
1106 | /* Remove all LWPs belong to PID from the lwp list. */ |
1107 | ||
1108 | static void | |
1109 | purge_lwp_list (int pid) | |
1110 | { | |
1111 | struct lwp_info *lp, *lpprev, *lpnext; | |
1112 | ||
1113 | lpprev = NULL; | |
1114 | ||
1115 | for (lp = lwp_list; lp; lp = lpnext) | |
1116 | { | |
1117 | lpnext = lp->next; | |
1118 | ||
1119 | if (ptid_get_pid (lp->ptid) == pid) | |
1120 | { | |
1121 | if (lp == lwp_list) | |
1122 | lwp_list = lp->next; | |
1123 | else | |
1124 | lpprev->next = lp->next; | |
1125 | ||
1126 | xfree (lp); | |
1127 | } | |
1128 | else | |
1129 | lpprev = lp; | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | /* Return the number of known LWPs in the tgid given by PID. */ | |
1134 | ||
1135 | static int | |
1136 | num_lwps (int pid) | |
1137 | { | |
1138 | int count = 0; | |
1139 | struct lwp_info *lp; | |
1140 | ||
1141 | for (lp = lwp_list; lp; lp = lp->next) | |
1142 | if (ptid_get_pid (lp->ptid) == pid) | |
1143 | count++; | |
1144 | ||
1145 | return count; | |
d6b0e80f AC |
1146 | } |
1147 | ||
f973ed9c | 1148 | /* Add the LWP specified by PID to the list. Return a pointer to the |
9f0bdab8 DJ |
1149 | structure describing the new LWP. The LWP should already be stopped |
1150 | (with an exception for the very first LWP). */ | |
d6b0e80f AC |
1151 | |
1152 | static struct lwp_info * | |
1153 | add_lwp (ptid_t ptid) | |
1154 | { | |
1155 | struct lwp_info *lp; | |
1156 | ||
1157 | gdb_assert (is_lwp (ptid)); | |
1158 | ||
1159 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
1160 | ||
1161 | memset (lp, 0, sizeof (struct lwp_info)); | |
1162 | ||
25289eb2 | 1163 | lp->last_resume_kind = resume_continue; |
d6b0e80f AC |
1164 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; |
1165 | ||
1166 | lp->ptid = ptid; | |
dc146f7c | 1167 | lp->core = -1; |
d6b0e80f AC |
1168 | |
1169 | lp->next = lwp_list; | |
1170 | lwp_list = lp; | |
d6b0e80f | 1171 | |
d90e17a7 | 1172 | if (num_lwps (GET_PID (ptid)) > 1 && linux_nat_new_thread != NULL) |
9f0bdab8 DJ |
1173 | linux_nat_new_thread (ptid); |
1174 | ||
d6b0e80f AC |
1175 | return lp; |
1176 | } | |
1177 | ||
1178 | /* Remove the LWP specified by PID from the list. */ | |
1179 | ||
1180 | static void | |
1181 | delete_lwp (ptid_t ptid) | |
1182 | { | |
1183 | struct lwp_info *lp, *lpprev; | |
1184 | ||
1185 | lpprev = NULL; | |
1186 | ||
1187 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
1188 | if (ptid_equal (lp->ptid, ptid)) | |
1189 | break; | |
1190 | ||
1191 | if (!lp) | |
1192 | return; | |
1193 | ||
d6b0e80f AC |
1194 | if (lpprev) |
1195 | lpprev->next = lp->next; | |
1196 | else | |
1197 | lwp_list = lp->next; | |
1198 | ||
1199 | xfree (lp); | |
1200 | } | |
1201 | ||
1202 | /* Return a pointer to the structure describing the LWP corresponding | |
1203 | to PID. If no corresponding LWP could be found, return NULL. */ | |
1204 | ||
1205 | static struct lwp_info * | |
1206 | find_lwp_pid (ptid_t ptid) | |
1207 | { | |
1208 | struct lwp_info *lp; | |
1209 | int lwp; | |
1210 | ||
1211 | if (is_lwp (ptid)) | |
1212 | lwp = GET_LWP (ptid); | |
1213 | else | |
1214 | lwp = GET_PID (ptid); | |
1215 | ||
1216 | for (lp = lwp_list; lp; lp = lp->next) | |
1217 | if (lwp == GET_LWP (lp->ptid)) | |
1218 | return lp; | |
1219 | ||
1220 | return NULL; | |
1221 | } | |
1222 | ||
1223 | /* Call CALLBACK with its second argument set to DATA for every LWP in | |
1224 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1225 | pointer to the structure describing that LWP immediately. | |
1226 | Otherwise return NULL. */ | |
1227 | ||
1228 | struct lwp_info * | |
d90e17a7 PA |
1229 | iterate_over_lwps (ptid_t filter, |
1230 | int (*callback) (struct lwp_info *, void *), | |
1231 | void *data) | |
d6b0e80f AC |
1232 | { |
1233 | struct lwp_info *lp, *lpnext; | |
1234 | ||
1235 | for (lp = lwp_list; lp; lp = lpnext) | |
1236 | { | |
1237 | lpnext = lp->next; | |
d90e17a7 PA |
1238 | |
1239 | if (ptid_match (lp->ptid, filter)) | |
1240 | { | |
1241 | if ((*callback) (lp, data)) | |
1242 | return lp; | |
1243 | } | |
d6b0e80f AC |
1244 | } |
1245 | ||
1246 | return NULL; | |
1247 | } | |
1248 | ||
2277426b PA |
1249 | /* Update our internal state when changing from one checkpoint to |
1250 | another indicated by NEW_PTID. We can only switch single-threaded | |
1251 | applications, so we only create one new LWP, and the previous list | |
1252 | is discarded. */ | |
f973ed9c DJ |
1253 | |
1254 | void | |
1255 | linux_nat_switch_fork (ptid_t new_ptid) | |
1256 | { | |
1257 | struct lwp_info *lp; | |
1258 | ||
2277426b PA |
1259 | purge_lwp_list (GET_PID (inferior_ptid)); |
1260 | ||
f973ed9c DJ |
1261 | lp = add_lwp (new_ptid); |
1262 | lp->stopped = 1; | |
e26af52f | 1263 | |
2277426b PA |
1264 | /* This changes the thread's ptid while preserving the gdb thread |
1265 | num. Also changes the inferior pid, while preserving the | |
1266 | inferior num. */ | |
1267 | thread_change_ptid (inferior_ptid, new_ptid); | |
1268 | ||
1269 | /* We've just told GDB core that the thread changed target id, but, | |
1270 | in fact, it really is a different thread, with different register | |
1271 | contents. */ | |
1272 | registers_changed (); | |
e26af52f DJ |
1273 | } |
1274 | ||
e26af52f DJ |
1275 | /* Handle the exit of a single thread LP. */ |
1276 | ||
1277 | static void | |
1278 | exit_lwp (struct lwp_info *lp) | |
1279 | { | |
e09875d4 | 1280 | struct thread_info *th = find_thread_ptid (lp->ptid); |
063bfe2e VP |
1281 | |
1282 | if (th) | |
e26af52f | 1283 | { |
17faa917 DJ |
1284 | if (print_thread_events) |
1285 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1286 | ||
4f8d22e3 | 1287 | delete_thread (lp->ptid); |
e26af52f DJ |
1288 | } |
1289 | ||
1290 | delete_lwp (lp->ptid); | |
1291 | } | |
1292 | ||
a0ef4274 DJ |
1293 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1294 | Other states including `T (tracing stop)' are reported as false. */ | |
1295 | ||
1296 | static int | |
1297 | pid_is_stopped (pid_t pid) | |
1298 | { | |
1299 | FILE *status_file; | |
1300 | char buf[100]; | |
1301 | int retval = 0; | |
1302 | ||
1303 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1304 | status_file = fopen (buf, "r"); | |
1305 | if (status_file != NULL) | |
1306 | { | |
1307 | int have_state = 0; | |
1308 | ||
1309 | while (fgets (buf, sizeof (buf), status_file)) | |
1310 | { | |
1311 | if (strncmp (buf, "State:", 6) == 0) | |
1312 | { | |
1313 | have_state = 1; | |
1314 | break; | |
1315 | } | |
1316 | } | |
1317 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1318 | retval = 1; | |
1319 | fclose (status_file); | |
1320 | } | |
1321 | return retval; | |
1322 | } | |
1323 | ||
1324 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1325 | Returns a wait status for that LWP, to cache. */ | |
1326 | ||
1327 | static int | |
1328 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1329 | int *signalled) | |
1330 | { | |
1331 | pid_t new_pid, pid = GET_LWP (ptid); | |
1332 | int status; | |
1333 | ||
1334 | if (pid_is_stopped (pid)) | |
1335 | { | |
1336 | if (debug_linux_nat) | |
1337 | fprintf_unfiltered (gdb_stdlog, | |
1338 | "LNPAW: Attaching to a stopped process\n"); | |
1339 | ||
1340 | /* The process is definitely stopped. It is in a job control | |
1341 | stop, unless the kernel predates the TASK_STOPPED / | |
1342 | TASK_TRACED distinction, in which case it might be in a | |
1343 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1344 | can kill it, signal it, et cetera. | |
1345 | ||
1346 | First make sure there is a pending SIGSTOP. Since we are | |
1347 | already attached, the process can not transition from stopped | |
1348 | to running without a PTRACE_CONT; so we know this signal will | |
1349 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1350 | probably already in the queue (unless this kernel is old | |
1351 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1352 | is not an RT signal, it can only be queued once. */ | |
1353 | kill_lwp (pid, SIGSTOP); | |
1354 | ||
1355 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1356 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1357 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1358 | } | |
1359 | ||
1360 | /* Make sure the initial process is stopped. The user-level threads | |
1361 | layer might want to poke around in the inferior, and that won't | |
1362 | work if things haven't stabilized yet. */ | |
1363 | new_pid = my_waitpid (pid, &status, 0); | |
1364 | if (new_pid == -1 && errno == ECHILD) | |
1365 | { | |
1366 | if (first) | |
1367 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1368 | ||
1369 | /* Try again with __WCLONE to check cloned processes. */ | |
1370 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1371 | *cloned = 1; | |
1372 | } | |
1373 | ||
dacc9cb2 PP |
1374 | gdb_assert (pid == new_pid); |
1375 | ||
1376 | if (!WIFSTOPPED (status)) | |
1377 | { | |
1378 | /* The pid we tried to attach has apparently just exited. */ | |
1379 | if (debug_linux_nat) | |
1380 | fprintf_unfiltered (gdb_stdlog, "LNPAW: Failed to stop %d: %s", | |
1381 | pid, status_to_str (status)); | |
1382 | return status; | |
1383 | } | |
a0ef4274 DJ |
1384 | |
1385 | if (WSTOPSIG (status) != SIGSTOP) | |
1386 | { | |
1387 | *signalled = 1; | |
1388 | if (debug_linux_nat) | |
1389 | fprintf_unfiltered (gdb_stdlog, | |
1390 | "LNPAW: Received %s after attaching\n", | |
1391 | status_to_str (status)); | |
1392 | } | |
1393 | ||
1394 | return status; | |
1395 | } | |
1396 | ||
84636d28 PA |
1397 | /* Attach to the LWP specified by PID. Return 0 if successful, -1 if |
1398 | the new LWP could not be attached, or 1 if we're already auto | |
1399 | attached to this thread, but haven't processed the | |
1400 | PTRACE_EVENT_CLONE event of its parent thread, so we just ignore | |
1401 | its existance, without considering it an error. */ | |
d6b0e80f | 1402 | |
9ee57c33 | 1403 | int |
93815fbf | 1404 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1405 | { |
9ee57c33 | 1406 | struct lwp_info *lp; |
7feb7d06 | 1407 | sigset_t prev_mask; |
84636d28 | 1408 | int lwpid; |
d6b0e80f AC |
1409 | |
1410 | gdb_assert (is_lwp (ptid)); | |
1411 | ||
7feb7d06 | 1412 | block_child_signals (&prev_mask); |
d6b0e80f | 1413 | |
9ee57c33 | 1414 | lp = find_lwp_pid (ptid); |
84636d28 | 1415 | lwpid = GET_LWP (ptid); |
d6b0e80f AC |
1416 | |
1417 | /* We assume that we're already attached to any LWP that has an id | |
1418 | equal to the overall process id, and to any LWP that is already | |
1419 | in our list of LWPs. If we're not seeing exit events from threads | |
1420 | and we've had PID wraparound since we last tried to stop all threads, | |
1421 | this assumption might be wrong; fortunately, this is very unlikely | |
1422 | to happen. */ | |
84636d28 | 1423 | if (lwpid != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1424 | { |
a0ef4274 | 1425 | int status, cloned = 0, signalled = 0; |
d6b0e80f | 1426 | |
84636d28 | 1427 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) < 0) |
9ee57c33 | 1428 | { |
84636d28 PA |
1429 | if (linux_supports_tracefork_flag) |
1430 | { | |
1431 | /* If we haven't stopped all threads when we get here, | |
1432 | we may have seen a thread listed in thread_db's list, | |
1433 | but not processed the PTRACE_EVENT_CLONE yet. If | |
1434 | that's the case, ignore this new thread, and let | |
1435 | normal event handling discover it later. */ | |
1436 | if (in_pid_list_p (stopped_pids, lwpid)) | |
1437 | { | |
1438 | /* We've already seen this thread stop, but we | |
1439 | haven't seen the PTRACE_EVENT_CLONE extended | |
1440 | event yet. */ | |
1441 | restore_child_signals_mask (&prev_mask); | |
1442 | return 0; | |
1443 | } | |
1444 | else | |
1445 | { | |
1446 | int new_pid; | |
1447 | int status; | |
1448 | ||
1449 | /* See if we've got a stop for this new child | |
1450 | pending. If so, we're already attached. */ | |
1451 | new_pid = my_waitpid (lwpid, &status, WNOHANG); | |
1452 | if (new_pid == -1 && errno == ECHILD) | |
1453 | new_pid = my_waitpid (lwpid, &status, __WCLONE | WNOHANG); | |
1454 | if (new_pid != -1) | |
1455 | { | |
1456 | if (WIFSTOPPED (status)) | |
1457 | add_to_pid_list (&stopped_pids, lwpid, status); | |
1458 | ||
1459 | restore_child_signals_mask (&prev_mask); | |
1460 | return 1; | |
1461 | } | |
1462 | } | |
1463 | } | |
1464 | ||
9ee57c33 DJ |
1465 | /* If we fail to attach to the thread, issue a warning, |
1466 | but continue. One way this can happen is if thread | |
e9efe249 | 1467 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1468 | bug may place threads in the thread list and then fail |
1469 | to create them. */ | |
1470 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1471 | safe_strerror (errno)); | |
7feb7d06 | 1472 | restore_child_signals_mask (&prev_mask); |
9ee57c33 DJ |
1473 | return -1; |
1474 | } | |
1475 | ||
d6b0e80f AC |
1476 | if (debug_linux_nat) |
1477 | fprintf_unfiltered (gdb_stdlog, | |
1478 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1479 | target_pid_to_str (ptid)); | |
1480 | ||
a0ef4274 | 1481 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
dacc9cb2 | 1482 | if (!WIFSTOPPED (status)) |
673c2bbe DE |
1483 | { |
1484 | restore_child_signals_mask (&prev_mask); | |
f687d035 | 1485 | return 1; |
673c2bbe | 1486 | } |
dacc9cb2 | 1487 | |
a0ef4274 DJ |
1488 | lp = add_lwp (ptid); |
1489 | lp->stopped = 1; | |
1490 | lp->cloned = cloned; | |
1491 | lp->signalled = signalled; | |
1492 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1493 | { |
a0ef4274 DJ |
1494 | lp->resumed = 1; |
1495 | lp->status = status; | |
d6b0e80f AC |
1496 | } |
1497 | ||
a0ef4274 | 1498 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1499 | |
1500 | if (debug_linux_nat) | |
1501 | { | |
1502 | fprintf_unfiltered (gdb_stdlog, | |
1503 | "LLAL: waitpid %s received %s\n", | |
1504 | target_pid_to_str (ptid), | |
1505 | status_to_str (status)); | |
1506 | } | |
1507 | } | |
1508 | else | |
1509 | { | |
1510 | /* We assume that the LWP representing the original process is | |
1511 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1512 | that the GNU/linux ptrace layer uses to keep track of |
1513 | threads. Note that this won't have already been done since | |
1514 | the main thread will have, we assume, been stopped by an | |
1515 | attach from a different layer. */ | |
9ee57c33 DJ |
1516 | if (lp == NULL) |
1517 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1518 | lp->stopped = 1; |
1519 | } | |
9ee57c33 | 1520 | |
25289eb2 | 1521 | lp->last_resume_kind = resume_stop; |
7feb7d06 | 1522 | restore_child_signals_mask (&prev_mask); |
9ee57c33 | 1523 | return 0; |
d6b0e80f AC |
1524 | } |
1525 | ||
b84876c2 | 1526 | static void |
136d6dae VP |
1527 | linux_nat_create_inferior (struct target_ops *ops, |
1528 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1529 | int from_tty) |
1530 | { | |
10568435 JK |
1531 | #ifdef HAVE_PERSONALITY |
1532 | int personality_orig = 0, personality_set = 0; | |
1533 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1534 | |
1535 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1536 | we have to mask the async mode. */ | |
1537 | ||
10568435 JK |
1538 | #ifdef HAVE_PERSONALITY |
1539 | if (disable_randomization) | |
1540 | { | |
1541 | errno = 0; | |
1542 | personality_orig = personality (0xffffffff); | |
1543 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1544 | { | |
1545 | personality_set = 1; | |
1546 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1547 | } | |
1548 | if (errno != 0 || (personality_set | |
1549 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1550 | warning (_("Error disabling address space randomization: %s"), | |
1551 | safe_strerror (errno)); | |
1552 | } | |
1553 | #endif /* HAVE_PERSONALITY */ | |
1554 | ||
2455069d UW |
1555 | /* Make sure we report all signals during startup. */ |
1556 | linux_nat_pass_signals (0, NULL); | |
1557 | ||
136d6dae | 1558 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1559 | |
10568435 JK |
1560 | #ifdef HAVE_PERSONALITY |
1561 | if (personality_set) | |
1562 | { | |
1563 | errno = 0; | |
1564 | personality (personality_orig); | |
1565 | if (errno != 0) | |
1566 | warning (_("Error restoring address space randomization: %s"), | |
1567 | safe_strerror (errno)); | |
1568 | } | |
1569 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1570 | } |
1571 | ||
d6b0e80f | 1572 | static void |
136d6dae | 1573 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1574 | { |
1575 | struct lwp_info *lp; | |
d6b0e80f | 1576 | int status; |
af990527 | 1577 | ptid_t ptid; |
d6b0e80f | 1578 | |
2455069d UW |
1579 | /* Make sure we report all signals during attach. */ |
1580 | linux_nat_pass_signals (0, NULL); | |
1581 | ||
136d6dae | 1582 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1583 | |
af990527 PA |
1584 | /* The ptrace base target adds the main thread with (pid,0,0) |
1585 | format. Decorate it with lwp info. */ | |
1586 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1587 | thread_change_ptid (inferior_ptid, ptid); | |
1588 | ||
9f0bdab8 | 1589 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1590 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1591 | |
1592 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1593 | &lp->signalled); | |
dacc9cb2 PP |
1594 | if (!WIFSTOPPED (status)) |
1595 | { | |
1596 | if (WIFEXITED (status)) | |
1597 | { | |
1598 | int exit_code = WEXITSTATUS (status); | |
1599 | ||
1600 | target_terminal_ours (); | |
1601 | target_mourn_inferior (); | |
1602 | if (exit_code == 0) | |
1603 | error (_("Unable to attach: program exited normally.")); | |
1604 | else | |
1605 | error (_("Unable to attach: program exited with code %d."), | |
1606 | exit_code); | |
1607 | } | |
1608 | else if (WIFSIGNALED (status)) | |
1609 | { | |
1610 | enum target_signal signo; | |
1611 | ||
1612 | target_terminal_ours (); | |
1613 | target_mourn_inferior (); | |
1614 | ||
1615 | signo = target_signal_from_host (WTERMSIG (status)); | |
1616 | error (_("Unable to attach: program terminated with signal " | |
1617 | "%s, %s."), | |
1618 | target_signal_to_name (signo), | |
1619 | target_signal_to_string (signo)); | |
1620 | } | |
1621 | ||
1622 | internal_error (__FILE__, __LINE__, | |
1623 | _("unexpected status %d for PID %ld"), | |
1624 | status, (long) GET_LWP (ptid)); | |
1625 | } | |
1626 | ||
a0ef4274 | 1627 | lp->stopped = 1; |
9f0bdab8 | 1628 | |
a0ef4274 | 1629 | /* Save the wait status to report later. */ |
d6b0e80f | 1630 | lp->resumed = 1; |
a0ef4274 DJ |
1631 | if (debug_linux_nat) |
1632 | fprintf_unfiltered (gdb_stdlog, | |
1633 | "LNA: waitpid %ld, saving status %s\n", | |
1634 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd | 1635 | |
7feb7d06 PA |
1636 | lp->status = status; |
1637 | ||
1638 | if (target_can_async_p ()) | |
1639 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1640 | } |
1641 | ||
a0ef4274 DJ |
1642 | /* Get pending status of LP. */ |
1643 | static int | |
1644 | get_pending_status (struct lwp_info *lp, int *status) | |
1645 | { | |
ca2163eb PA |
1646 | enum target_signal signo = TARGET_SIGNAL_0; |
1647 | ||
1648 | /* If we paused threads momentarily, we may have stored pending | |
1649 | events in lp->status or lp->waitstatus (see stop_wait_callback), | |
1650 | and GDB core hasn't seen any signal for those threads. | |
1651 | Otherwise, the last signal reported to the core is found in the | |
1652 | thread object's stop_signal. | |
1653 | ||
1654 | There's a corner case that isn't handled here at present. Only | |
1655 | if the thread stopped with a TARGET_WAITKIND_STOPPED does | |
1656 | stop_signal make sense as a real signal to pass to the inferior. | |
1657 | Some catchpoint related events, like | |
1658 | TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set | |
1659 | to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But, | |
1660 | those traps are debug API (ptrace in our case) related and | |
1661 | induced; the inferior wouldn't see them if it wasn't being | |
1662 | traced. Hence, we should never pass them to the inferior, even | |
1663 | when set to pass state. Since this corner case isn't handled by | |
1664 | infrun.c when proceeding with a signal, for consistency, neither | |
1665 | do we handle it here (or elsewhere in the file we check for | |
1666 | signal pass state). Normally SIGTRAP isn't set to pass state, so | |
1667 | this is really a corner case. */ | |
1668 | ||
1669 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
1670 | signo = TARGET_SIGNAL_0; /* a pending ptrace event, not a real signal. */ | |
1671 | else if (lp->status) | |
1672 | signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1673 | else if (non_stop && !is_executing (lp->ptid)) | |
1674 | { | |
1675 | struct thread_info *tp = find_thread_ptid (lp->ptid); | |
e0881a8e | 1676 | |
16c381f0 | 1677 | signo = tp->suspend.stop_signal; |
ca2163eb PA |
1678 | } |
1679 | else if (!non_stop) | |
a0ef4274 | 1680 | { |
ca2163eb PA |
1681 | struct target_waitstatus last; |
1682 | ptid_t last_ptid; | |
4c28f408 | 1683 | |
ca2163eb | 1684 | get_last_target_status (&last_ptid, &last); |
4c28f408 | 1685 | |
ca2163eb PA |
1686 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) |
1687 | { | |
e09875d4 | 1688 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
e0881a8e | 1689 | |
16c381f0 | 1690 | signo = tp->suspend.stop_signal; |
4c28f408 | 1691 | } |
ca2163eb | 1692 | } |
4c28f408 | 1693 | |
ca2163eb | 1694 | *status = 0; |
4c28f408 | 1695 | |
ca2163eb PA |
1696 | if (signo == TARGET_SIGNAL_0) |
1697 | { | |
1698 | if (debug_linux_nat) | |
1699 | fprintf_unfiltered (gdb_stdlog, | |
1700 | "GPT: lwp %s has no pending signal\n", | |
1701 | target_pid_to_str (lp->ptid)); | |
1702 | } | |
1703 | else if (!signal_pass_state (signo)) | |
1704 | { | |
1705 | if (debug_linux_nat) | |
3e43a32a MS |
1706 | fprintf_unfiltered (gdb_stdlog, |
1707 | "GPT: lwp %s had signal %s, " | |
1708 | "but it is in no pass state\n", | |
ca2163eb PA |
1709 | target_pid_to_str (lp->ptid), |
1710 | target_signal_to_string (signo)); | |
a0ef4274 | 1711 | } |
a0ef4274 | 1712 | else |
4c28f408 | 1713 | { |
ca2163eb PA |
1714 | *status = W_STOPCODE (target_signal_to_host (signo)); |
1715 | ||
1716 | if (debug_linux_nat) | |
1717 | fprintf_unfiltered (gdb_stdlog, | |
1718 | "GPT: lwp %s has pending signal %s\n", | |
1719 | target_pid_to_str (lp->ptid), | |
1720 | target_signal_to_string (signo)); | |
4c28f408 | 1721 | } |
a0ef4274 DJ |
1722 | |
1723 | return 0; | |
1724 | } | |
1725 | ||
d6b0e80f AC |
1726 | static int |
1727 | detach_callback (struct lwp_info *lp, void *data) | |
1728 | { | |
1729 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1730 | ||
1731 | if (debug_linux_nat && lp->status) | |
1732 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1733 | strsignal (WSTOPSIG (lp->status)), | |
1734 | target_pid_to_str (lp->ptid)); | |
1735 | ||
a0ef4274 DJ |
1736 | /* If there is a pending SIGSTOP, get rid of it. */ |
1737 | if (lp->signalled) | |
d6b0e80f | 1738 | { |
d6b0e80f AC |
1739 | if (debug_linux_nat) |
1740 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1741 | "DC: Sending SIGCONT to %s\n", |
1742 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1743 | |
a0ef4274 | 1744 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1745 | lp->signalled = 0; |
d6b0e80f AC |
1746 | } |
1747 | ||
1748 | /* We don't actually detach from the LWP that has an id equal to the | |
1749 | overall process id just yet. */ | |
1750 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1751 | { | |
a0ef4274 DJ |
1752 | int status = 0; |
1753 | ||
1754 | /* Pass on any pending signal for this LWP. */ | |
1755 | get_pending_status (lp, &status); | |
1756 | ||
d6b0e80f AC |
1757 | errno = 0; |
1758 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1759 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1760 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1761 | safe_strerror (errno)); |
1762 | ||
1763 | if (debug_linux_nat) | |
1764 | fprintf_unfiltered (gdb_stdlog, | |
1765 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1766 | target_pid_to_str (lp->ptid), | |
7feb7d06 | 1767 | strsignal (WSTOPSIG (status))); |
d6b0e80f AC |
1768 | |
1769 | delete_lwp (lp->ptid); | |
1770 | } | |
1771 | ||
1772 | return 0; | |
1773 | } | |
1774 | ||
1775 | static void | |
136d6dae | 1776 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1777 | { |
b84876c2 | 1778 | int pid; |
a0ef4274 | 1779 | int status; |
d90e17a7 PA |
1780 | struct lwp_info *main_lwp; |
1781 | ||
1782 | pid = GET_PID (inferior_ptid); | |
a0ef4274 | 1783 | |
b84876c2 PA |
1784 | if (target_can_async_p ()) |
1785 | linux_nat_async (NULL, 0); | |
1786 | ||
4c28f408 PA |
1787 | /* Stop all threads before detaching. ptrace requires that the |
1788 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1789 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1790 | /* ... and wait until all of them have reported back that |
1791 | they're no longer running. */ | |
d90e17a7 | 1792 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1793 | |
d90e17a7 | 1794 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1795 | |
1796 | /* Only the initial process should be left right now. */ | |
d90e17a7 PA |
1797 | gdb_assert (num_lwps (GET_PID (inferior_ptid)) == 1); |
1798 | ||
1799 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1800 | |
a0ef4274 DJ |
1801 | /* Pass on any pending signal for the last LWP. */ |
1802 | if ((args == NULL || *args == '\0') | |
d90e17a7 | 1803 | && get_pending_status (main_lwp, &status) != -1 |
a0ef4274 DJ |
1804 | && WIFSTOPPED (status)) |
1805 | { | |
1806 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1807 | pass it along with PTRACE_DETACH. */ | |
1808 | args = alloca (8); | |
1809 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
ddabfc73 TT |
1810 | if (debug_linux_nat) |
1811 | fprintf_unfiltered (gdb_stdlog, | |
1812 | "LND: Sending signal %s to %s\n", | |
1813 | args, | |
1814 | target_pid_to_str (main_lwp->ptid)); | |
a0ef4274 DJ |
1815 | } |
1816 | ||
d90e17a7 | 1817 | delete_lwp (main_lwp->ptid); |
b84876c2 | 1818 | |
7a7d3353 PA |
1819 | if (forks_exist_p ()) |
1820 | { | |
1821 | /* Multi-fork case. The current inferior_ptid is being detached | |
1822 | from, but there are other viable forks to debug. Detach from | |
1823 | the current fork, and context-switch to the first | |
1824 | available. */ | |
1825 | linux_fork_detach (args, from_tty); | |
1826 | ||
1827 | if (non_stop && target_can_async_p ()) | |
1828 | target_async (inferior_event_handler, 0); | |
1829 | } | |
1830 | else | |
1831 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1832 | } |
1833 | ||
1834 | /* Resume LP. */ | |
1835 | ||
25289eb2 PA |
1836 | static void |
1837 | resume_lwp (struct lwp_info *lp, int step) | |
d6b0e80f | 1838 | { |
25289eb2 | 1839 | if (lp->stopped) |
6c95b8df | 1840 | { |
25289eb2 PA |
1841 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
1842 | ||
1843 | if (inf->vfork_child != NULL) | |
1844 | { | |
1845 | if (debug_linux_nat) | |
1846 | fprintf_unfiltered (gdb_stdlog, | |
1847 | "RC: Not resuming %s (vfork parent)\n", | |
1848 | target_pid_to_str (lp->ptid)); | |
1849 | } | |
1850 | else if (lp->status == 0 | |
1851 | && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) | |
1852 | { | |
1853 | if (debug_linux_nat) | |
1854 | fprintf_unfiltered (gdb_stdlog, | |
1855 | "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n", | |
1856 | target_pid_to_str (lp->ptid)); | |
1857 | ||
1858 | linux_ops->to_resume (linux_ops, | |
1859 | pid_to_ptid (GET_LWP (lp->ptid)), | |
1860 | step, TARGET_SIGNAL_0); | |
1861 | if (debug_linux_nat) | |
1862 | fprintf_unfiltered (gdb_stdlog, | |
1863 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", | |
1864 | target_pid_to_str (lp->ptid)); | |
1865 | lp->stopped = 0; | |
1866 | lp->step = step; | |
1867 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
1868 | lp->stopped_by_watchpoint = 0; | |
1869 | } | |
1870 | else | |
1871 | { | |
1872 | if (debug_linux_nat) | |
1873 | fprintf_unfiltered (gdb_stdlog, | |
1874 | "RC: Not resuming sibling %s (has pending)\n", | |
1875 | target_pid_to_str (lp->ptid)); | |
1876 | } | |
6c95b8df | 1877 | } |
25289eb2 | 1878 | else |
d6b0e80f | 1879 | { |
d90e17a7 PA |
1880 | if (debug_linux_nat) |
1881 | fprintf_unfiltered (gdb_stdlog, | |
25289eb2 | 1882 | "RC: Not resuming sibling %s (not stopped)\n", |
d6b0e80f | 1883 | target_pid_to_str (lp->ptid)); |
d6b0e80f | 1884 | } |
25289eb2 | 1885 | } |
d6b0e80f | 1886 | |
25289eb2 PA |
1887 | static int |
1888 | resume_callback (struct lwp_info *lp, void *data) | |
1889 | { | |
1890 | resume_lwp (lp, 0); | |
d6b0e80f AC |
1891 | return 0; |
1892 | } | |
1893 | ||
1894 | static int | |
1895 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1896 | { | |
1897 | lp->resumed = 0; | |
25289eb2 | 1898 | lp->last_resume_kind = resume_stop; |
d6b0e80f AC |
1899 | return 0; |
1900 | } | |
1901 | ||
1902 | static int | |
1903 | resume_set_callback (struct lwp_info *lp, void *data) | |
1904 | { | |
1905 | lp->resumed = 1; | |
25289eb2 | 1906 | lp->last_resume_kind = resume_continue; |
d6b0e80f AC |
1907 | return 0; |
1908 | } | |
1909 | ||
1910 | static void | |
28439f5e PA |
1911 | linux_nat_resume (struct target_ops *ops, |
1912 | ptid_t ptid, int step, enum target_signal signo) | |
d6b0e80f | 1913 | { |
7feb7d06 | 1914 | sigset_t prev_mask; |
d6b0e80f | 1915 | struct lwp_info *lp; |
d90e17a7 | 1916 | int resume_many; |
d6b0e80f | 1917 | |
76f50ad1 DJ |
1918 | if (debug_linux_nat) |
1919 | fprintf_unfiltered (gdb_stdlog, | |
1920 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1921 | step ? "step" : "resume", | |
1922 | target_pid_to_str (ptid), | |
423ec54c JK |
1923 | (signo != TARGET_SIGNAL_0 |
1924 | ? strsignal (target_signal_to_host (signo)) : "0"), | |
76f50ad1 DJ |
1925 | target_pid_to_str (inferior_ptid)); |
1926 | ||
7feb7d06 | 1927 | block_child_signals (&prev_mask); |
b84876c2 | 1928 | |
d6b0e80f | 1929 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1930 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1931 | || ptid_is_pid (ptid)); | |
4c28f408 | 1932 | |
e3e9f5a2 PA |
1933 | /* Mark the lwps we're resuming as resumed. */ |
1934 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
d6b0e80f | 1935 | |
d90e17a7 PA |
1936 | /* See if it's the current inferior that should be handled |
1937 | specially. */ | |
1938 | if (resume_many) | |
1939 | lp = find_lwp_pid (inferior_ptid); | |
1940 | else | |
1941 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1942 | gdb_assert (lp != NULL); |
d6b0e80f | 1943 | |
9f0bdab8 DJ |
1944 | /* Remember if we're stepping. */ |
1945 | lp->step = step; | |
25289eb2 | 1946 | lp->last_resume_kind = step ? resume_step : resume_continue; |
d6b0e80f | 1947 | |
9f0bdab8 DJ |
1948 | /* If we have a pending wait status for this thread, there is no |
1949 | point in resuming the process. But first make sure that | |
1950 | linux_nat_wait won't preemptively handle the event - we | |
1951 | should never take this short-circuit if we are going to | |
1952 | leave LP running, since we have skipped resuming all the | |
1953 | other threads. This bit of code needs to be synchronized | |
1954 | with linux_nat_wait. */ | |
76f50ad1 | 1955 | |
9f0bdab8 DJ |
1956 | if (lp->status && WIFSTOPPED (lp->status)) |
1957 | { | |
2455069d UW |
1958 | if (!lp->step |
1959 | && WSTOPSIG (lp->status) | |
1960 | && sigismember (&pass_mask, WSTOPSIG (lp->status))) | |
d6b0e80f | 1961 | { |
9f0bdab8 DJ |
1962 | if (debug_linux_nat) |
1963 | fprintf_unfiltered (gdb_stdlog, | |
1964 | "LLR: Not short circuiting for ignored " | |
1965 | "status 0x%x\n", lp->status); | |
1966 | ||
d6b0e80f AC |
1967 | /* FIXME: What should we do if we are supposed to continue |
1968 | this thread with a signal? */ | |
1969 | gdb_assert (signo == TARGET_SIGNAL_0); | |
2455069d | 1970 | signo = target_signal_from_host (WSTOPSIG (lp->status)); |
9f0bdab8 DJ |
1971 | lp->status = 0; |
1972 | } | |
1973 | } | |
76f50ad1 | 1974 | |
6c95b8df | 1975 | if (lp->status || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
9f0bdab8 DJ |
1976 | { |
1977 | /* FIXME: What should we do if we are supposed to continue | |
1978 | this thread with a signal? */ | |
1979 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1980 | |
9f0bdab8 DJ |
1981 | if (debug_linux_nat) |
1982 | fprintf_unfiltered (gdb_stdlog, | |
1983 | "LLR: Short circuiting for status 0x%x\n", | |
1984 | lp->status); | |
d6b0e80f | 1985 | |
7feb7d06 PA |
1986 | restore_child_signals_mask (&prev_mask); |
1987 | if (target_can_async_p ()) | |
1988 | { | |
1989 | target_async (inferior_event_handler, 0); | |
1990 | /* Tell the event loop we have something to process. */ | |
1991 | async_file_mark (); | |
1992 | } | |
9f0bdab8 | 1993 | return; |
d6b0e80f AC |
1994 | } |
1995 | ||
9f0bdab8 DJ |
1996 | /* Mark LWP as not stopped to prevent it from being continued by |
1997 | resume_callback. */ | |
1998 | lp->stopped = 0; | |
1999 | ||
d90e17a7 PA |
2000 | if (resume_many) |
2001 | iterate_over_lwps (ptid, resume_callback, NULL); | |
2002 | ||
2003 | /* Convert to something the lower layer understands. */ | |
2004 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
d6b0e80f | 2005 | |
28439f5e | 2006 | linux_ops->to_resume (linux_ops, ptid, step, signo); |
9f0bdab8 | 2007 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
ebec9a0f | 2008 | lp->stopped_by_watchpoint = 0; |
9f0bdab8 | 2009 | |
d6b0e80f AC |
2010 | if (debug_linux_nat) |
2011 | fprintf_unfiltered (gdb_stdlog, | |
2012 | "LLR: %s %s, %s (resume event thread)\n", | |
2013 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2014 | target_pid_to_str (ptid), | |
423ec54c JK |
2015 | (signo != TARGET_SIGNAL_0 |
2016 | ? strsignal (target_signal_to_host (signo)) : "0")); | |
b84876c2 | 2017 | |
7feb7d06 | 2018 | restore_child_signals_mask (&prev_mask); |
b84876c2 | 2019 | if (target_can_async_p ()) |
8ea051c5 | 2020 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
2021 | } |
2022 | ||
c5f62d5f | 2023 | /* Send a signal to an LWP. */ |
d6b0e80f AC |
2024 | |
2025 | static int | |
2026 | kill_lwp (int lwpid, int signo) | |
2027 | { | |
c5f62d5f DE |
2028 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
2029 | fails, then we are not using nptl threads and we should be using kill. */ | |
d6b0e80f AC |
2030 | |
2031 | #ifdef HAVE_TKILL_SYSCALL | |
c5f62d5f DE |
2032 | { |
2033 | static int tkill_failed; | |
2034 | ||
2035 | if (!tkill_failed) | |
2036 | { | |
2037 | int ret; | |
2038 | ||
2039 | errno = 0; | |
2040 | ret = syscall (__NR_tkill, lwpid, signo); | |
2041 | if (errno != ENOSYS) | |
2042 | return ret; | |
2043 | tkill_failed = 1; | |
2044 | } | |
2045 | } | |
d6b0e80f AC |
2046 | #endif |
2047 | ||
2048 | return kill (lwpid, signo); | |
2049 | } | |
2050 | ||
ca2163eb PA |
2051 | /* Handle a GNU/Linux syscall trap wait response. If we see a syscall |
2052 | event, check if the core is interested in it: if not, ignore the | |
2053 | event, and keep waiting; otherwise, we need to toggle the LWP's | |
2054 | syscall entry/exit status, since the ptrace event itself doesn't | |
2055 | indicate it, and report the trap to higher layers. */ | |
2056 | ||
2057 | static int | |
2058 | linux_handle_syscall_trap (struct lwp_info *lp, int stopping) | |
2059 | { | |
2060 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
2061 | struct gdbarch *gdbarch = target_thread_architecture (lp->ptid); | |
2062 | int syscall_number = (int) gdbarch_get_syscall_number (gdbarch, lp->ptid); | |
2063 | ||
2064 | if (stopping) | |
2065 | { | |
2066 | /* If we're stopping threads, there's a SIGSTOP pending, which | |
2067 | makes it so that the LWP reports an immediate syscall return, | |
2068 | followed by the SIGSTOP. Skip seeing that "return" using | |
2069 | PTRACE_CONT directly, and let stop_wait_callback collect the | |
2070 | SIGSTOP. Later when the thread is resumed, a new syscall | |
2071 | entry event. If we didn't do this (and returned 0), we'd | |
2072 | leave a syscall entry pending, and our caller, by using | |
2073 | PTRACE_CONT to collect the SIGSTOP, skips the syscall return | |
2074 | itself. Later, when the user re-resumes this LWP, we'd see | |
2075 | another syscall entry event and we'd mistake it for a return. | |
2076 | ||
2077 | If stop_wait_callback didn't force the SIGSTOP out of the LWP | |
2078 | (leaving immediately with LWP->signalled set, without issuing | |
2079 | a PTRACE_CONT), it would still be problematic to leave this | |
2080 | syscall enter pending, as later when the thread is resumed, | |
2081 | it would then see the same syscall exit mentioned above, | |
2082 | followed by the delayed SIGSTOP, while the syscall didn't | |
2083 | actually get to execute. It seems it would be even more | |
2084 | confusing to the user. */ | |
2085 | ||
2086 | if (debug_linux_nat) | |
2087 | fprintf_unfiltered (gdb_stdlog, | |
2088 | "LHST: ignoring syscall %d " | |
2089 | "for LWP %ld (stopping threads), " | |
2090 | "resuming with PTRACE_CONT for SIGSTOP\n", | |
2091 | syscall_number, | |
2092 | GET_LWP (lp->ptid)); | |
2093 | ||
2094 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2095 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2096 | return 1; | |
2097 | } | |
2098 | ||
2099 | if (catch_syscall_enabled ()) | |
2100 | { | |
2101 | /* Always update the entry/return state, even if this particular | |
2102 | syscall isn't interesting to the core now. In async mode, | |
2103 | the user could install a new catchpoint for this syscall | |
2104 | between syscall enter/return, and we'll need to know to | |
2105 | report a syscall return if that happens. */ | |
2106 | lp->syscall_state = (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2107 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2108 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2109 | ||
2110 | if (catching_syscall_number (syscall_number)) | |
2111 | { | |
2112 | /* Alright, an event to report. */ | |
2113 | ourstatus->kind = lp->syscall_state; | |
2114 | ourstatus->value.syscall_number = syscall_number; | |
2115 | ||
2116 | if (debug_linux_nat) | |
2117 | fprintf_unfiltered (gdb_stdlog, | |
2118 | "LHST: stopping for %s of syscall %d" | |
2119 | " for LWP %ld\n", | |
3e43a32a MS |
2120 | lp->syscall_state |
2121 | == TARGET_WAITKIND_SYSCALL_ENTRY | |
ca2163eb PA |
2122 | ? "entry" : "return", |
2123 | syscall_number, | |
2124 | GET_LWP (lp->ptid)); | |
2125 | return 0; | |
2126 | } | |
2127 | ||
2128 | if (debug_linux_nat) | |
2129 | fprintf_unfiltered (gdb_stdlog, | |
2130 | "LHST: ignoring %s of syscall %d " | |
2131 | "for LWP %ld\n", | |
2132 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2133 | ? "entry" : "return", | |
2134 | syscall_number, | |
2135 | GET_LWP (lp->ptid)); | |
2136 | } | |
2137 | else | |
2138 | { | |
2139 | /* If we had been syscall tracing, and hence used PT_SYSCALL | |
2140 | before on this LWP, it could happen that the user removes all | |
2141 | syscall catchpoints before we get to process this event. | |
2142 | There are two noteworthy issues here: | |
2143 | ||
2144 | - When stopped at a syscall entry event, resuming with | |
2145 | PT_STEP still resumes executing the syscall and reports a | |
2146 | syscall return. | |
2147 | ||
2148 | - Only PT_SYSCALL catches syscall enters. If we last | |
2149 | single-stepped this thread, then this event can't be a | |
2150 | syscall enter. If we last single-stepped this thread, this | |
2151 | has to be a syscall exit. | |
2152 | ||
2153 | The points above mean that the next resume, be it PT_STEP or | |
2154 | PT_CONTINUE, can not trigger a syscall trace event. */ | |
2155 | if (debug_linux_nat) | |
2156 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2157 | "LHST: caught syscall event " |
2158 | "with no syscall catchpoints." | |
ca2163eb PA |
2159 | " %d for LWP %ld, ignoring\n", |
2160 | syscall_number, | |
2161 | GET_LWP (lp->ptid)); | |
2162 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2163 | } | |
2164 | ||
2165 | /* The core isn't interested in this event. For efficiency, avoid | |
2166 | stopping all threads only to have the core resume them all again. | |
2167 | Since we're not stopping threads, if we're still syscall tracing | |
2168 | and not stepping, we can't use PTRACE_CONT here, as we'd miss any | |
2169 | subsequent syscall. Simply resume using the inf-ptrace layer, | |
2170 | which knows when to use PT_SYSCALL or PT_CONTINUE. */ | |
2171 | ||
2172 | /* Note that gdbarch_get_syscall_number may access registers, hence | |
2173 | fill a regcache. */ | |
2174 | registers_changed (); | |
2175 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
2176 | lp->step, TARGET_SIGNAL_0); | |
2177 | return 1; | |
2178 | } | |
2179 | ||
3d799a95 DJ |
2180 | /* Handle a GNU/Linux extended wait response. If we see a clone |
2181 | event, we need to add the new LWP to our list (and not report the | |
2182 | trap to higher layers). This function returns non-zero if the | |
2183 | event should be ignored and we should wait again. If STOPPING is | |
2184 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
2185 | |
2186 | static int | |
3d799a95 DJ |
2187 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
2188 | int stopping) | |
d6b0e80f | 2189 | { |
3d799a95 DJ |
2190 | int pid = GET_LWP (lp->ptid); |
2191 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
3d799a95 | 2192 | int event = status >> 16; |
d6b0e80f | 2193 | |
3d799a95 DJ |
2194 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
2195 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 2196 | { |
3d799a95 DJ |
2197 | unsigned long new_pid; |
2198 | int ret; | |
2199 | ||
2200 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 2201 | |
3d799a95 DJ |
2202 | /* If we haven't already seen the new PID stop, wait for it now. */ |
2203 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
2204 | { | |
2205 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
2206 | hits the SIGSTOP, but we're already attached. */ | |
2207 | ret = my_waitpid (new_pid, &status, | |
2208 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
2209 | if (ret == -1) | |
2210 | perror_with_name (_("waiting for new child")); | |
2211 | else if (ret != new_pid) | |
2212 | internal_error (__FILE__, __LINE__, | |
2213 | _("wait returned unexpected PID %d"), ret); | |
2214 | else if (!WIFSTOPPED (status)) | |
2215 | internal_error (__FILE__, __LINE__, | |
2216 | _("wait returned unexpected status 0x%x"), status); | |
2217 | } | |
2218 | ||
3a3e9ee3 | 2219 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 | 2220 | |
2277426b PA |
2221 | if (event == PTRACE_EVENT_FORK |
2222 | && linux_fork_checkpointing_p (GET_PID (lp->ptid))) | |
2223 | { | |
2277426b PA |
2224 | /* Handle checkpointing by linux-fork.c here as a special |
2225 | case. We don't want the follow-fork-mode or 'catch fork' | |
2226 | to interfere with this. */ | |
2227 | ||
2228 | /* This won't actually modify the breakpoint list, but will | |
2229 | physically remove the breakpoints from the child. */ | |
2230 | detach_breakpoints (new_pid); | |
2231 | ||
2232 | /* Retain child fork in ptrace (stopped) state. */ | |
14571dad MS |
2233 | if (!find_fork_pid (new_pid)) |
2234 | add_fork (new_pid); | |
2277426b PA |
2235 | |
2236 | /* Report as spurious, so that infrun doesn't want to follow | |
2237 | this fork. We're actually doing an infcall in | |
2238 | linux-fork.c. */ | |
2239 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
2240 | linux_enable_event_reporting (pid_to_ptid (new_pid)); | |
2241 | ||
2242 | /* Report the stop to the core. */ | |
2243 | return 0; | |
2244 | } | |
2245 | ||
3d799a95 DJ |
2246 | if (event == PTRACE_EVENT_FORK) |
2247 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
2248 | else if (event == PTRACE_EVENT_VFORK) | |
2249 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 2250 | else |
3d799a95 | 2251 | { |
78768c4a JK |
2252 | struct lwp_info *new_lp; |
2253 | ||
3d799a95 | 2254 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
78768c4a | 2255 | |
d90e17a7 | 2256 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (lp->ptid))); |
3d799a95 | 2257 | new_lp->cloned = 1; |
4c28f408 | 2258 | new_lp->stopped = 1; |
d6b0e80f | 2259 | |
3d799a95 DJ |
2260 | if (WSTOPSIG (status) != SIGSTOP) |
2261 | { | |
2262 | /* This can happen if someone starts sending signals to | |
2263 | the new thread before it gets a chance to run, which | |
2264 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
2265 | This is an unlikely case, and harder to handle for | |
2266 | fork / vfork than for clone, so we do not try - but | |
2267 | we handle it for clone events here. We'll send | |
2268 | the other signal on to the thread below. */ | |
2269 | ||
2270 | new_lp->signalled = 1; | |
2271 | } | |
2272 | else | |
2273 | status = 0; | |
d6b0e80f | 2274 | |
4c28f408 | 2275 | if (non_stop) |
3d799a95 | 2276 | { |
4c28f408 PA |
2277 | /* Add the new thread to GDB's lists as soon as possible |
2278 | so that: | |
2279 | ||
2280 | 1) the frontend doesn't have to wait for a stop to | |
2281 | display them, and, | |
2282 | ||
2283 | 2) we tag it with the correct running state. */ | |
2284 | ||
2285 | /* If the thread_db layer is active, let it know about | |
2286 | this new thread, and add it to GDB's list. */ | |
2287 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
2288 | { | |
2289 | /* We're not using thread_db. Add it to GDB's | |
2290 | list. */ | |
2291 | target_post_attach (GET_LWP (new_lp->ptid)); | |
2292 | add_thread (new_lp->ptid); | |
2293 | } | |
2294 | ||
2295 | if (!stopping) | |
2296 | { | |
2297 | set_running (new_lp->ptid, 1); | |
2298 | set_executing (new_lp->ptid, 1); | |
2299 | } | |
2300 | } | |
2301 | ||
ca2163eb PA |
2302 | /* Note the need to use the low target ops to resume, to |
2303 | handle resuming with PT_SYSCALL if we have syscall | |
2304 | catchpoints. */ | |
4c28f408 PA |
2305 | if (!stopping) |
2306 | { | |
423ec54c | 2307 | enum target_signal signo; |
ca2163eb | 2308 | |
4c28f408 | 2309 | new_lp->stopped = 0; |
3d799a95 | 2310 | new_lp->resumed = 1; |
25289eb2 | 2311 | new_lp->last_resume_kind = resume_continue; |
ca2163eb PA |
2312 | |
2313 | signo = (status | |
2314 | ? target_signal_from_host (WSTOPSIG (status)) | |
2315 | : TARGET_SIGNAL_0); | |
2316 | ||
2317 | linux_ops->to_resume (linux_ops, pid_to_ptid (new_pid), | |
2318 | 0, signo); | |
3d799a95 | 2319 | } |
ad34eb2f JK |
2320 | else |
2321 | { | |
2322 | if (status != 0) | |
2323 | { | |
2324 | /* We created NEW_LP so it cannot yet contain STATUS. */ | |
2325 | gdb_assert (new_lp->status == 0); | |
2326 | ||
2327 | /* Save the wait status to report later. */ | |
2328 | if (debug_linux_nat) | |
2329 | fprintf_unfiltered (gdb_stdlog, | |
2330 | "LHEW: waitpid of new LWP %ld, " | |
2331 | "saving status %s\n", | |
2332 | (long) GET_LWP (new_lp->ptid), | |
2333 | status_to_str (status)); | |
2334 | new_lp->status = status; | |
2335 | } | |
2336 | } | |
d6b0e80f | 2337 | |
3d799a95 DJ |
2338 | if (debug_linux_nat) |
2339 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2340 | "LHEW: Got clone event " |
2341 | "from LWP %ld, resuming\n", | |
3d799a95 | 2342 | GET_LWP (lp->ptid)); |
ca2163eb PA |
2343 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
2344 | 0, TARGET_SIGNAL_0); | |
3d799a95 DJ |
2345 | |
2346 | return 1; | |
2347 | } | |
2348 | ||
2349 | return 0; | |
d6b0e80f AC |
2350 | } |
2351 | ||
3d799a95 DJ |
2352 | if (event == PTRACE_EVENT_EXEC) |
2353 | { | |
a75724bc PA |
2354 | if (debug_linux_nat) |
2355 | fprintf_unfiltered (gdb_stdlog, | |
2356 | "LHEW: Got exec event from LWP %ld\n", | |
2357 | GET_LWP (lp->ptid)); | |
2358 | ||
3d799a95 DJ |
2359 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
2360 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 2361 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 | 2362 | |
6c95b8df PA |
2363 | return 0; |
2364 | } | |
2365 | ||
2366 | if (event == PTRACE_EVENT_VFORK_DONE) | |
2367 | { | |
2368 | if (current_inferior ()->waiting_for_vfork_done) | |
3d799a95 | 2369 | { |
6c95b8df | 2370 | if (debug_linux_nat) |
3e43a32a MS |
2371 | fprintf_unfiltered (gdb_stdlog, |
2372 | "LHEW: Got expected PTRACE_EVENT_" | |
2373 | "VFORK_DONE from LWP %ld: stopping\n", | |
6c95b8df | 2374 | GET_LWP (lp->ptid)); |
3d799a95 | 2375 | |
6c95b8df PA |
2376 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; |
2377 | return 0; | |
3d799a95 DJ |
2378 | } |
2379 | ||
6c95b8df | 2380 | if (debug_linux_nat) |
3e43a32a MS |
2381 | fprintf_unfiltered (gdb_stdlog, |
2382 | "LHEW: Got PTRACE_EVENT_VFORK_DONE " | |
2383 | "from LWP %ld: resuming\n", | |
6c95b8df PA |
2384 | GET_LWP (lp->ptid)); |
2385 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2386 | return 1; | |
3d799a95 DJ |
2387 | } |
2388 | ||
2389 | internal_error (__FILE__, __LINE__, | |
2390 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
2391 | } |
2392 | ||
432b4d03 JK |
2393 | /* Return non-zero if LWP is a zombie. */ |
2394 | ||
2395 | static int | |
2396 | linux_lwp_is_zombie (long lwp) | |
2397 | { | |
2398 | char buffer[MAXPATHLEN]; | |
2399 | FILE *procfile; | |
2400 | int retval = 0; | |
2401 | ||
07e78767 | 2402 | xsnprintf (buffer, sizeof (buffer), "/proc/%ld/status", lwp); |
432b4d03 JK |
2403 | procfile = fopen (buffer, "r"); |
2404 | if (procfile == NULL) | |
2405 | { | |
2406 | warning (_("unable to open /proc file '%s'"), buffer); | |
2407 | return 0; | |
2408 | } | |
2409 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) | |
2410 | if (strcmp (buffer, "State:\tZ (zombie)\n") == 0) | |
2411 | { | |
2412 | retval = 1; | |
2413 | break; | |
2414 | } | |
2415 | fclose (procfile); | |
2416 | ||
2417 | return retval; | |
2418 | } | |
2419 | ||
d6b0e80f AC |
2420 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has |
2421 | exited. */ | |
2422 | ||
2423 | static int | |
2424 | wait_lwp (struct lwp_info *lp) | |
2425 | { | |
2426 | pid_t pid; | |
432b4d03 | 2427 | int status = 0; |
d6b0e80f | 2428 | int thread_dead = 0; |
432b4d03 | 2429 | sigset_t prev_mask; |
d6b0e80f AC |
2430 | |
2431 | gdb_assert (!lp->stopped); | |
2432 | gdb_assert (lp->status == 0); | |
2433 | ||
432b4d03 JK |
2434 | /* Make sure SIGCHLD is blocked for sigsuspend avoiding a race below. */ |
2435 | block_child_signals (&prev_mask); | |
2436 | ||
2437 | for (;;) | |
d6b0e80f | 2438 | { |
432b4d03 JK |
2439 | /* If my_waitpid returns 0 it means the __WCLONE vs. non-__WCLONE kind |
2440 | was right and we should just call sigsuspend. */ | |
2441 | ||
2442 | pid = my_waitpid (GET_LWP (lp->ptid), &status, WNOHANG); | |
d6b0e80f | 2443 | if (pid == -1 && errno == ECHILD) |
432b4d03 | 2444 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE | WNOHANG); |
a9f4bb21 PA |
2445 | if (pid == -1 && errno == ECHILD) |
2446 | { | |
2447 | /* The thread has previously exited. We need to delete it | |
2448 | now because, for some vendor 2.4 kernels with NPTL | |
2449 | support backported, there won't be an exit event unless | |
2450 | it is the main thread. 2.6 kernels will report an exit | |
2451 | event for each thread that exits, as expected. */ | |
2452 | thread_dead = 1; | |
2453 | if (debug_linux_nat) | |
2454 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2455 | target_pid_to_str (lp->ptid)); | |
2456 | } | |
432b4d03 JK |
2457 | if (pid != 0) |
2458 | break; | |
2459 | ||
2460 | /* Bugs 10970, 12702. | |
2461 | Thread group leader may have exited in which case we'll lock up in | |
2462 | waitpid if there are other threads, even if they are all zombies too. | |
2463 | Basically, we're not supposed to use waitpid this way. | |
2464 | __WCLONE is not applicable for the leader so we can't use that. | |
2465 | LINUX_NAT_THREAD_ALIVE cannot be used here as it requires a STOPPED | |
2466 | process; it gets ESRCH both for the zombie and for running processes. | |
2467 | ||
2468 | As a workaround, check if we're waiting for the thread group leader and | |
2469 | if it's a zombie, and avoid calling waitpid if it is. | |
2470 | ||
2471 | This is racy, what if the tgl becomes a zombie right after we check? | |
2472 | Therefore always use WNOHANG with sigsuspend - it is equivalent to | |
2473 | waiting waitpid but the linux_lwp_is_zombie is safe this way. */ | |
2474 | ||
2475 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid) | |
2476 | && linux_lwp_is_zombie (GET_LWP (lp->ptid))) | |
d6b0e80f | 2477 | { |
d6b0e80f AC |
2478 | thread_dead = 1; |
2479 | if (debug_linux_nat) | |
432b4d03 JK |
2480 | fprintf_unfiltered (gdb_stdlog, |
2481 | "WL: Thread group leader %s vanished.\n", | |
d6b0e80f | 2482 | target_pid_to_str (lp->ptid)); |
432b4d03 | 2483 | break; |
d6b0e80f | 2484 | } |
432b4d03 JK |
2485 | |
2486 | /* Wait for next SIGCHLD and try again. This may let SIGCHLD handlers | |
2487 | get invoked despite our caller had them intentionally blocked by | |
2488 | block_child_signals. This is sensitive only to the loop of | |
2489 | linux_nat_wait_1 and there if we get called my_waitpid gets called | |
2490 | again before it gets to sigsuspend so we can safely let the handlers | |
2491 | get executed here. */ | |
2492 | ||
2493 | sigsuspend (&suspend_mask); | |
2494 | } | |
2495 | ||
2496 | restore_child_signals_mask (&prev_mask); | |
2497 | ||
d6b0e80f AC |
2498 | if (!thread_dead) |
2499 | { | |
2500 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
2501 | ||
2502 | if (debug_linux_nat) | |
2503 | { | |
2504 | fprintf_unfiltered (gdb_stdlog, | |
2505 | "WL: waitpid %s received %s\n", | |
2506 | target_pid_to_str (lp->ptid), | |
2507 | status_to_str (status)); | |
2508 | } | |
d6b0e80f | 2509 | |
a9f4bb21 PA |
2510 | /* Check if the thread has exited. */ |
2511 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2512 | { | |
2513 | thread_dead = 1; | |
2514 | if (debug_linux_nat) | |
2515 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2516 | target_pid_to_str (lp->ptid)); | |
2517 | } | |
d6b0e80f AC |
2518 | } |
2519 | ||
2520 | if (thread_dead) | |
2521 | { | |
e26af52f | 2522 | exit_lwp (lp); |
d6b0e80f AC |
2523 | return 0; |
2524 | } | |
2525 | ||
2526 | gdb_assert (WIFSTOPPED (status)); | |
2527 | ||
ca2163eb PA |
2528 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
2529 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
2530 | { | |
2531 | /* No longer need the sysgood bit. The ptrace event ends up | |
2532 | recorded in lp->waitstatus if we care for it. We can carry | |
2533 | on handling the event like a regular SIGTRAP from here | |
2534 | on. */ | |
2535 | status = W_STOPCODE (SIGTRAP); | |
2536 | if (linux_handle_syscall_trap (lp, 1)) | |
2537 | return wait_lwp (lp); | |
2538 | } | |
2539 | ||
d6b0e80f AC |
2540 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
2541 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2542 | { | |
2543 | if (debug_linux_nat) | |
2544 | fprintf_unfiltered (gdb_stdlog, | |
2545 | "WL: Handling extended status 0x%06x\n", | |
2546 | status); | |
3d799a95 | 2547 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
2548 | return wait_lwp (lp); |
2549 | } | |
2550 | ||
2551 | return status; | |
2552 | } | |
2553 | ||
9f0bdab8 DJ |
2554 | /* Save the most recent siginfo for LP. This is currently only called |
2555 | for SIGTRAP; some ports use the si_addr field for | |
2556 | target_stopped_data_address. In the future, it may also be used to | |
2557 | restore the siginfo of requeued signals. */ | |
2558 | ||
2559 | static void | |
2560 | save_siginfo (struct lwp_info *lp) | |
2561 | { | |
2562 | errno = 0; | |
2563 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
2564 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
2565 | ||
2566 | if (errno != 0) | |
2567 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
2568 | } | |
2569 | ||
d6b0e80f AC |
2570 | /* Send a SIGSTOP to LP. */ |
2571 | ||
2572 | static int | |
2573 | stop_callback (struct lwp_info *lp, void *data) | |
2574 | { | |
2575 | if (!lp->stopped && !lp->signalled) | |
2576 | { | |
2577 | int ret; | |
2578 | ||
2579 | if (debug_linux_nat) | |
2580 | { | |
2581 | fprintf_unfiltered (gdb_stdlog, | |
2582 | "SC: kill %s **<SIGSTOP>**\n", | |
2583 | target_pid_to_str (lp->ptid)); | |
2584 | } | |
2585 | errno = 0; | |
2586 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
2587 | if (debug_linux_nat) | |
2588 | { | |
2589 | fprintf_unfiltered (gdb_stdlog, | |
2590 | "SC: lwp kill %d %s\n", | |
2591 | ret, | |
2592 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2593 | } | |
2594 | ||
2595 | lp->signalled = 1; | |
2596 | gdb_assert (lp->status == 0); | |
2597 | } | |
2598 | ||
2599 | return 0; | |
2600 | } | |
2601 | ||
57380f4e | 2602 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2603 | |
2604 | static int | |
57380f4e DJ |
2605 | linux_nat_has_pending_sigint (int pid) |
2606 | { | |
2607 | sigset_t pending, blocked, ignored; | |
57380f4e DJ |
2608 | |
2609 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2610 | ||
2611 | if (sigismember (&pending, SIGINT) | |
2612 | && !sigismember (&ignored, SIGINT)) | |
2613 | return 1; | |
2614 | ||
2615 | return 0; | |
2616 | } | |
2617 | ||
2618 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2619 | ||
2620 | static int | |
2621 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2622 | { |
57380f4e DJ |
2623 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2624 | flag to consume the next one. */ | |
2625 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2626 | && WSTOPSIG (lp->status) == SIGINT) | |
2627 | lp->status = 0; | |
2628 | else | |
2629 | lp->ignore_sigint = 1; | |
2630 | ||
2631 | return 0; | |
2632 | } | |
2633 | ||
2634 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2635 | This function is called after we know the LWP has stopped; if the LWP | |
2636 | stopped before the expected SIGINT was delivered, then it will never have | |
2637 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2638 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2639 | |
57380f4e DJ |
2640 | static void |
2641 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2642 | { | |
2643 | if (!lp->ignore_sigint) | |
2644 | return; | |
2645 | ||
2646 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2647 | { | |
2648 | if (debug_linux_nat) | |
2649 | fprintf_unfiltered (gdb_stdlog, | |
2650 | "MCIS: Clearing bogus flag for %s\n", | |
2651 | target_pid_to_str (lp->ptid)); | |
2652 | lp->ignore_sigint = 0; | |
2653 | } | |
2654 | } | |
2655 | ||
ebec9a0f PA |
2656 | /* Fetch the possible triggered data watchpoint info and store it in |
2657 | LP. | |
2658 | ||
2659 | On some archs, like x86, that use debug registers to set | |
2660 | watchpoints, it's possible that the way to know which watched | |
2661 | address trapped, is to check the register that is used to select | |
2662 | which address to watch. Problem is, between setting the watchpoint | |
2663 | and reading back which data address trapped, the user may change | |
2664 | the set of watchpoints, and, as a consequence, GDB changes the | |
2665 | debug registers in the inferior. To avoid reading back a stale | |
2666 | stopped-data-address when that happens, we cache in LP the fact | |
2667 | that a watchpoint trapped, and the corresponding data address, as | |
2668 | soon as we see LP stop with a SIGTRAP. If GDB changes the debug | |
2669 | registers meanwhile, we have the cached data we can rely on. */ | |
2670 | ||
2671 | static void | |
2672 | save_sigtrap (struct lwp_info *lp) | |
2673 | { | |
2674 | struct cleanup *old_chain; | |
2675 | ||
2676 | if (linux_ops->to_stopped_by_watchpoint == NULL) | |
2677 | { | |
2678 | lp->stopped_by_watchpoint = 0; | |
2679 | return; | |
2680 | } | |
2681 | ||
2682 | old_chain = save_inferior_ptid (); | |
2683 | inferior_ptid = lp->ptid; | |
2684 | ||
2685 | lp->stopped_by_watchpoint = linux_ops->to_stopped_by_watchpoint (); | |
2686 | ||
2687 | if (lp->stopped_by_watchpoint) | |
2688 | { | |
2689 | if (linux_ops->to_stopped_data_address != NULL) | |
2690 | lp->stopped_data_address_p = | |
2691 | linux_ops->to_stopped_data_address (¤t_target, | |
2692 | &lp->stopped_data_address); | |
2693 | else | |
2694 | lp->stopped_data_address_p = 0; | |
2695 | } | |
2696 | ||
2697 | do_cleanups (old_chain); | |
2698 | } | |
2699 | ||
2700 | /* See save_sigtrap. */ | |
2701 | ||
2702 | static int | |
2703 | linux_nat_stopped_by_watchpoint (void) | |
2704 | { | |
2705 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2706 | ||
2707 | gdb_assert (lp != NULL); | |
2708 | ||
2709 | return lp->stopped_by_watchpoint; | |
2710 | } | |
2711 | ||
2712 | static int | |
2713 | linux_nat_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p) | |
2714 | { | |
2715 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2716 | ||
2717 | gdb_assert (lp != NULL); | |
2718 | ||
2719 | *addr_p = lp->stopped_data_address; | |
2720 | ||
2721 | return lp->stopped_data_address_p; | |
2722 | } | |
2723 | ||
26ab7092 JK |
2724 | /* Commonly any breakpoint / watchpoint generate only SIGTRAP. */ |
2725 | ||
2726 | static int | |
2727 | sigtrap_is_event (int status) | |
2728 | { | |
2729 | return WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP; | |
2730 | } | |
2731 | ||
2732 | /* SIGTRAP-like events recognizer. */ | |
2733 | ||
2734 | static int (*linux_nat_status_is_event) (int status) = sigtrap_is_event; | |
2735 | ||
00390b84 JK |
2736 | /* Check for SIGTRAP-like events in LP. */ |
2737 | ||
2738 | static int | |
2739 | linux_nat_lp_status_is_event (struct lwp_info *lp) | |
2740 | { | |
2741 | /* We check for lp->waitstatus in addition to lp->status, because we can | |
2742 | have pending process exits recorded in lp->status | |
2743 | and W_EXITCODE(0,0) == 0. We should probably have an additional | |
2744 | lp->status_p flag. */ | |
2745 | ||
2746 | return (lp->waitstatus.kind == TARGET_WAITKIND_IGNORE | |
2747 | && linux_nat_status_is_event (lp->status)); | |
2748 | } | |
2749 | ||
26ab7092 JK |
2750 | /* Set alternative SIGTRAP-like events recognizer. If |
2751 | breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be | |
2752 | applied. */ | |
2753 | ||
2754 | void | |
2755 | linux_nat_set_status_is_event (struct target_ops *t, | |
2756 | int (*status_is_event) (int status)) | |
2757 | { | |
2758 | linux_nat_status_is_event = status_is_event; | |
2759 | } | |
2760 | ||
57380f4e DJ |
2761 | /* Wait until LP is stopped. */ |
2762 | ||
2763 | static int | |
2764 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2765 | { | |
6c95b8df PA |
2766 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
2767 | ||
2768 | /* If this is a vfork parent, bail out, it is not going to report | |
2769 | any SIGSTOP until the vfork is done with. */ | |
2770 | if (inf->vfork_child != NULL) | |
2771 | return 0; | |
2772 | ||
d6b0e80f AC |
2773 | if (!lp->stopped) |
2774 | { | |
2775 | int status; | |
2776 | ||
2777 | status = wait_lwp (lp); | |
2778 | if (status == 0) | |
2779 | return 0; | |
2780 | ||
57380f4e DJ |
2781 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2782 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2783 | { |
57380f4e | 2784 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2785 | |
2786 | errno = 0; | |
2787 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2788 | if (debug_linux_nat) | |
2789 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2790 | "PTRACE_CONT %s, 0, 0 (%s) " |
2791 | "(discarding SIGINT)\n", | |
d6b0e80f AC |
2792 | target_pid_to_str (lp->ptid), |
2793 | errno ? safe_strerror (errno) : "OK"); | |
2794 | ||
57380f4e | 2795 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2796 | } |
2797 | ||
57380f4e DJ |
2798 | maybe_clear_ignore_sigint (lp); |
2799 | ||
d6b0e80f AC |
2800 | if (WSTOPSIG (status) != SIGSTOP) |
2801 | { | |
26ab7092 | 2802 | if (linux_nat_status_is_event (status)) |
d6b0e80f AC |
2803 | { |
2804 | /* If a LWP other than the LWP that we're reporting an | |
2805 | event for has hit a GDB breakpoint (as opposed to | |
2806 | some random trap signal), then just arrange for it to | |
2807 | hit it again later. We don't keep the SIGTRAP status | |
2808 | and don't forward the SIGTRAP signal to the LWP. We | |
2809 | will handle the current event, eventually we will | |
2810 | resume all LWPs, and this one will get its breakpoint | |
2811 | trap again. | |
2812 | ||
2813 | If we do not do this, then we run the risk that the | |
2814 | user will delete or disable the breakpoint, but the | |
2815 | thread will have already tripped on it. */ | |
2816 | ||
9f0bdab8 DJ |
2817 | /* Save the trap's siginfo in case we need it later. */ |
2818 | save_siginfo (lp); | |
2819 | ||
ebec9a0f PA |
2820 | save_sigtrap (lp); |
2821 | ||
1777feb0 | 2822 | /* Now resume this LWP and get the SIGSTOP event. */ |
d6b0e80f AC |
2823 | errno = 0; |
2824 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2825 | if (debug_linux_nat) | |
2826 | { | |
2827 | fprintf_unfiltered (gdb_stdlog, | |
2828 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2829 | target_pid_to_str (lp->ptid), | |
2830 | errno ? safe_strerror (errno) : "OK"); | |
2831 | ||
2832 | fprintf_unfiltered (gdb_stdlog, | |
2833 | "SWC: Candidate SIGTRAP event in %s\n", | |
2834 | target_pid_to_str (lp->ptid)); | |
2835 | } | |
710151dd | 2836 | /* Hold this event/waitstatus while we check to see if |
1777feb0 | 2837 | there are any more (we still want to get that SIGSTOP). */ |
57380f4e | 2838 | stop_wait_callback (lp, NULL); |
710151dd | 2839 | |
7feb7d06 PA |
2840 | /* Hold the SIGTRAP for handling by linux_nat_wait. If |
2841 | there's another event, throw it back into the | |
1777feb0 | 2842 | queue. */ |
7feb7d06 | 2843 | if (lp->status) |
710151dd | 2844 | { |
7feb7d06 PA |
2845 | if (debug_linux_nat) |
2846 | fprintf_unfiltered (gdb_stdlog, | |
2847 | "SWC: kill %s, %s\n", | |
2848 | target_pid_to_str (lp->ptid), | |
2849 | status_to_str ((int) status)); | |
2850 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2851 | } |
7feb7d06 | 2852 | |
1777feb0 | 2853 | /* Save the sigtrap event. */ |
7feb7d06 | 2854 | lp->status = status; |
d6b0e80f AC |
2855 | return 0; |
2856 | } | |
2857 | else | |
2858 | { | |
2859 | /* The thread was stopped with a signal other than | |
1777feb0 | 2860 | SIGSTOP, and didn't accidentally trip a breakpoint. */ |
d6b0e80f AC |
2861 | |
2862 | if (debug_linux_nat) | |
2863 | { | |
2864 | fprintf_unfiltered (gdb_stdlog, | |
2865 | "SWC: Pending event %s in %s\n", | |
2866 | status_to_str ((int) status), | |
2867 | target_pid_to_str (lp->ptid)); | |
2868 | } | |
1777feb0 | 2869 | /* Now resume this LWP and get the SIGSTOP event. */ |
d6b0e80f AC |
2870 | errno = 0; |
2871 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2872 | if (debug_linux_nat) | |
2873 | fprintf_unfiltered (gdb_stdlog, | |
2874 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2875 | target_pid_to_str (lp->ptid), | |
2876 | errno ? safe_strerror (errno) : "OK"); | |
2877 | ||
2878 | /* Hold this event/waitstatus while we check to see if | |
1777feb0 | 2879 | there are any more (we still want to get that SIGSTOP). */ |
57380f4e | 2880 | stop_wait_callback (lp, NULL); |
710151dd PA |
2881 | |
2882 | /* If the lp->status field is still empty, use it to | |
2883 | hold this event. If not, then this event must be | |
2884 | returned to the event queue of the LWP. */ | |
7feb7d06 | 2885 | if (lp->status) |
d6b0e80f AC |
2886 | { |
2887 | if (debug_linux_nat) | |
2888 | { | |
2889 | fprintf_unfiltered (gdb_stdlog, | |
2890 | "SWC: kill %s, %s\n", | |
2891 | target_pid_to_str (lp->ptid), | |
2892 | status_to_str ((int) status)); | |
2893 | } | |
2894 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2895 | } | |
710151dd PA |
2896 | else |
2897 | lp->status = status; | |
d6b0e80f AC |
2898 | return 0; |
2899 | } | |
2900 | } | |
2901 | else | |
2902 | { | |
2903 | /* We caught the SIGSTOP that we intended to catch, so | |
2904 | there's no SIGSTOP pending. */ | |
2905 | lp->stopped = 1; | |
2906 | lp->signalled = 0; | |
2907 | } | |
2908 | } | |
2909 | ||
2910 | return 0; | |
2911 | } | |
2912 | ||
d6b0e80f AC |
2913 | /* Return non-zero if LP has a wait status pending. */ |
2914 | ||
2915 | static int | |
2916 | status_callback (struct lwp_info *lp, void *data) | |
2917 | { | |
2918 | /* Only report a pending wait status if we pretend that this has | |
2919 | indeed been resumed. */ | |
ca2163eb PA |
2920 | if (!lp->resumed) |
2921 | return 0; | |
2922 | ||
2923 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2924 | { | |
2925 | /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event, | |
766062f6 | 2926 | or a pending process exit. Note that `W_EXITCODE(0,0) == |
ca2163eb PA |
2927 | 0', so a clean process exit can not be stored pending in |
2928 | lp->status, it is indistinguishable from | |
2929 | no-pending-status. */ | |
2930 | return 1; | |
2931 | } | |
2932 | ||
2933 | if (lp->status != 0) | |
2934 | return 1; | |
2935 | ||
2936 | return 0; | |
d6b0e80f AC |
2937 | } |
2938 | ||
2939 | /* Return non-zero if LP isn't stopped. */ | |
2940 | ||
2941 | static int | |
2942 | running_callback (struct lwp_info *lp, void *data) | |
2943 | { | |
25289eb2 PA |
2944 | return (!lp->stopped |
2945 | || ((lp->status != 0 | |
2946 | || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2947 | && lp->resumed)); | |
d6b0e80f AC |
2948 | } |
2949 | ||
2950 | /* Count the LWP's that have had events. */ | |
2951 | ||
2952 | static int | |
2953 | count_events_callback (struct lwp_info *lp, void *data) | |
2954 | { | |
2955 | int *count = data; | |
2956 | ||
2957 | gdb_assert (count != NULL); | |
2958 | ||
e09490f1 | 2959 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
00390b84 | 2960 | if (lp->resumed && linux_nat_lp_status_is_event (lp)) |
d6b0e80f AC |
2961 | (*count)++; |
2962 | ||
2963 | return 0; | |
2964 | } | |
2965 | ||
2966 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2967 | ||
2968 | static int | |
2969 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2970 | { | |
25289eb2 PA |
2971 | if (lp->last_resume_kind == resume_step |
2972 | && lp->status != 0) | |
d6b0e80f AC |
2973 | return 1; |
2974 | else | |
2975 | return 0; | |
2976 | } | |
2977 | ||
2978 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2979 | ||
2980 | static int | |
2981 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2982 | { | |
2983 | int *selector = data; | |
2984 | ||
2985 | gdb_assert (selector != NULL); | |
2986 | ||
1777feb0 | 2987 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
00390b84 | 2988 | if (lp->resumed && linux_nat_lp_status_is_event (lp)) |
d6b0e80f AC |
2989 | if ((*selector)-- == 0) |
2990 | return 1; | |
2991 | ||
2992 | return 0; | |
2993 | } | |
2994 | ||
710151dd PA |
2995 | static int |
2996 | cancel_breakpoint (struct lwp_info *lp) | |
2997 | { | |
2998 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2999 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
3000 | LWP. We will handle the current event, eventually we will resume | |
3001 | this LWP, and this breakpoint will trap again. | |
3002 | ||
3003 | If we do not do this, then we run the risk that the user will | |
3004 | delete or disable the breakpoint, but the LWP will have already | |
3005 | tripped on it. */ | |
3006 | ||
515630c5 UW |
3007 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
3008 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3009 | CORE_ADDR pc; | |
3010 | ||
3011 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
6c95b8df | 3012 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) |
710151dd PA |
3013 | { |
3014 | if (debug_linux_nat) | |
3015 | fprintf_unfiltered (gdb_stdlog, | |
3016 | "CB: Push back breakpoint for %s\n", | |
3017 | target_pid_to_str (lp->ptid)); | |
3018 | ||
3019 | /* Back up the PC if necessary. */ | |
515630c5 UW |
3020 | if (gdbarch_decr_pc_after_break (gdbarch)) |
3021 | regcache_write_pc (regcache, pc); | |
3022 | ||
710151dd PA |
3023 | return 1; |
3024 | } | |
3025 | return 0; | |
3026 | } | |
3027 | ||
d6b0e80f AC |
3028 | static int |
3029 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
3030 | { | |
3031 | struct lwp_info *event_lp = data; | |
3032 | ||
3033 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
3034 | if (lp == event_lp) | |
3035 | return 0; | |
3036 | ||
3037 | /* If a LWP other than the LWP that we're reporting an event for has | |
3038 | hit a GDB breakpoint (as opposed to some random trap signal), | |
3039 | then just arrange for it to hit it again later. We don't keep | |
3040 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
3041 | LWP. We will handle the current event, eventually we will resume | |
3042 | all LWPs, and this one will get its breakpoint trap again. | |
3043 | ||
3044 | If we do not do this, then we run the risk that the user will | |
3045 | delete or disable the breakpoint, but the LWP will have already | |
3046 | tripped on it. */ | |
3047 | ||
00390b84 | 3048 | if (linux_nat_lp_status_is_event (lp) |
710151dd PA |
3049 | && cancel_breakpoint (lp)) |
3050 | /* Throw away the SIGTRAP. */ | |
3051 | lp->status = 0; | |
d6b0e80f AC |
3052 | |
3053 | return 0; | |
3054 | } | |
3055 | ||
3056 | /* Select one LWP out of those that have events pending. */ | |
3057 | ||
3058 | static void | |
d90e17a7 | 3059 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
3060 | { |
3061 | int num_events = 0; | |
3062 | int random_selector; | |
3063 | struct lwp_info *event_lp; | |
3064 | ||
ac264b3b | 3065 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
3066 | (*orig_lp)->status = *status; |
3067 | ||
3068 | /* Give preference to any LWP that is being single-stepped. */ | |
d90e17a7 PA |
3069 | event_lp = iterate_over_lwps (filter, |
3070 | select_singlestep_lwp_callback, NULL); | |
d6b0e80f AC |
3071 | if (event_lp != NULL) |
3072 | { | |
3073 | if (debug_linux_nat) | |
3074 | fprintf_unfiltered (gdb_stdlog, | |
3075 | "SEL: Select single-step %s\n", | |
3076 | target_pid_to_str (event_lp->ptid)); | |
3077 | } | |
3078 | else | |
3079 | { | |
3080 | /* No single-stepping LWP. Select one at random, out of those | |
3081 | which have had SIGTRAP events. */ | |
3082 | ||
3083 | /* First see how many SIGTRAP events we have. */ | |
d90e17a7 | 3084 | iterate_over_lwps (filter, count_events_callback, &num_events); |
d6b0e80f AC |
3085 | |
3086 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
3087 | random_selector = (int) | |
3088 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
3089 | ||
3090 | if (debug_linux_nat && num_events > 1) | |
3091 | fprintf_unfiltered (gdb_stdlog, | |
3092 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
3093 | num_events, random_selector); | |
3094 | ||
d90e17a7 PA |
3095 | event_lp = iterate_over_lwps (filter, |
3096 | select_event_lwp_callback, | |
d6b0e80f AC |
3097 | &random_selector); |
3098 | } | |
3099 | ||
3100 | if (event_lp != NULL) | |
3101 | { | |
3102 | /* Switch the event LWP. */ | |
3103 | *orig_lp = event_lp; | |
3104 | *status = event_lp->status; | |
3105 | } | |
3106 | ||
3107 | /* Flush the wait status for the event LWP. */ | |
3108 | (*orig_lp)->status = 0; | |
3109 | } | |
3110 | ||
3111 | /* Return non-zero if LP has been resumed. */ | |
3112 | ||
3113 | static int | |
3114 | resumed_callback (struct lwp_info *lp, void *data) | |
3115 | { | |
3116 | return lp->resumed; | |
3117 | } | |
3118 | ||
d6b0e80f AC |
3119 | /* Stop an active thread, verify it still exists, then resume it. */ |
3120 | ||
3121 | static int | |
3122 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
3123 | { | |
25289eb2 | 3124 | if (!lp->stopped) |
d6b0e80f | 3125 | { |
25289eb2 PA |
3126 | enum resume_kind last_resume_kind = lp->last_resume_kind; |
3127 | ptid_t ptid = lp->ptid; | |
3128 | ||
d6b0e80f AC |
3129 | stop_callback (lp, NULL); |
3130 | stop_wait_callback (lp, NULL); | |
25289eb2 PA |
3131 | |
3132 | /* Resume if the lwp still exists, and the core wanted it | |
3133 | running. */ | |
3134 | if (last_resume_kind != resume_stop) | |
3135 | { | |
3136 | lp = find_lwp_pid (ptid); | |
3137 | if (lp) | |
3138 | resume_lwp (lp, lp->step); | |
3139 | } | |
d6b0e80f AC |
3140 | } |
3141 | return 0; | |
3142 | } | |
3143 | ||
02f3fc28 | 3144 | /* Check if we should go on and pass this event to common code. |
fa2c6a57 | 3145 | Return the affected lwp if we are, or NULL otherwise. */ |
02f3fc28 PA |
3146 | static struct lwp_info * |
3147 | linux_nat_filter_event (int lwpid, int status, int options) | |
3148 | { | |
3149 | struct lwp_info *lp; | |
3150 | ||
3151 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
3152 | ||
3153 | /* Check for stop events reported by a process we didn't already | |
3154 | know about - anything not already in our LWP list. | |
3155 | ||
3156 | If we're expecting to receive stopped processes after | |
3157 | fork, vfork, and clone events, then we'll just add the | |
3158 | new one to our list and go back to waiting for the event | |
3159 | to be reported - the stopped process might be returned | |
3160 | from waitpid before or after the event is. */ | |
3161 | if (WIFSTOPPED (status) && !lp) | |
3162 | { | |
84636d28 | 3163 | add_to_pid_list (&stopped_pids, lwpid, status); |
02f3fc28 PA |
3164 | return NULL; |
3165 | } | |
3166 | ||
3167 | /* Make sure we don't report an event for the exit of an LWP not in | |
1777feb0 | 3168 | our list, i.e. not part of the current process. This can happen |
fd62cb89 | 3169 | if we detach from a program we originally forked and then it |
02f3fc28 PA |
3170 | exits. */ |
3171 | if (!WIFSTOPPED (status) && !lp) | |
3172 | return NULL; | |
3173 | ||
3174 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
3175 | CLONE_PTRACE processes which do not use the thread library - | |
3176 | otherwise we wouldn't find the new LWP this way. That doesn't | |
3177 | currently work, and the following code is currently unreachable | |
3178 | due to the two blocks above. If it's fixed some day, this code | |
3179 | should be broken out into a function so that we can also pick up | |
3180 | LWPs from the new interface. */ | |
3181 | if (!lp) | |
3182 | { | |
3183 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
3184 | if (options & __WCLONE) | |
3185 | lp->cloned = 1; | |
3186 | ||
3187 | gdb_assert (WIFSTOPPED (status) | |
3188 | && WSTOPSIG (status) == SIGSTOP); | |
3189 | lp->signalled = 1; | |
3190 | ||
3191 | if (!in_thread_list (inferior_ptid)) | |
3192 | { | |
3193 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
3194 | GET_PID (inferior_ptid)); | |
3195 | add_thread (inferior_ptid); | |
3196 | } | |
3197 | ||
3198 | add_thread (lp->ptid); | |
3199 | } | |
3200 | ||
ca2163eb PA |
3201 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
3202 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
3203 | { | |
3204 | /* No longer need the sysgood bit. The ptrace event ends up | |
3205 | recorded in lp->waitstatus if we care for it. We can carry | |
3206 | on handling the event like a regular SIGTRAP from here | |
3207 | on. */ | |
3208 | status = W_STOPCODE (SIGTRAP); | |
3209 | if (linux_handle_syscall_trap (lp, 0)) | |
3210 | return NULL; | |
3211 | } | |
02f3fc28 | 3212 | |
ca2163eb PA |
3213 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
3214 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
02f3fc28 PA |
3215 | { |
3216 | if (debug_linux_nat) | |
3217 | fprintf_unfiltered (gdb_stdlog, | |
3218 | "LLW: Handling extended status 0x%06x\n", | |
3219 | status); | |
3220 | if (linux_handle_extended_wait (lp, status, 0)) | |
3221 | return NULL; | |
3222 | } | |
3223 | ||
26ab7092 | 3224 | if (linux_nat_status_is_event (status)) |
ebec9a0f PA |
3225 | { |
3226 | /* Save the trap's siginfo in case we need it later. */ | |
3227 | save_siginfo (lp); | |
3228 | ||
3229 | save_sigtrap (lp); | |
3230 | } | |
ca2163eb | 3231 | |
02f3fc28 | 3232 | /* Check if the thread has exited. */ |
d90e17a7 PA |
3233 | if ((WIFEXITED (status) || WIFSIGNALED (status)) |
3234 | && num_lwps (GET_PID (lp->ptid)) > 1) | |
02f3fc28 | 3235 | { |
9db03742 JB |
3236 | /* If this is the main thread, we must stop all threads and verify |
3237 | if they are still alive. This is because in the nptl thread model | |
3238 | on Linux 2.4, there is no signal issued for exiting LWPs | |
02f3fc28 PA |
3239 | other than the main thread. We only get the main thread exit |
3240 | signal once all child threads have already exited. If we | |
3241 | stop all the threads and use the stop_wait_callback to check | |
3242 | if they have exited we can determine whether this signal | |
3243 | should be ignored or whether it means the end of the debugged | |
3244 | application, regardless of which threading model is being | |
5d3b6af6 | 3245 | used. */ |
02f3fc28 PA |
3246 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) |
3247 | { | |
3248 | lp->stopped = 1; | |
d90e17a7 PA |
3249 | iterate_over_lwps (pid_to_ptid (GET_PID (lp->ptid)), |
3250 | stop_and_resume_callback, NULL); | |
02f3fc28 PA |
3251 | } |
3252 | ||
3253 | if (debug_linux_nat) | |
3254 | fprintf_unfiltered (gdb_stdlog, | |
3255 | "LLW: %s exited.\n", | |
3256 | target_pid_to_str (lp->ptid)); | |
3257 | ||
d90e17a7 | 3258 | if (num_lwps (GET_PID (lp->ptid)) > 1) |
9db03742 JB |
3259 | { |
3260 | /* If there is at least one more LWP, then the exit signal | |
3261 | was not the end of the debugged application and should be | |
3262 | ignored. */ | |
3263 | exit_lwp (lp); | |
3264 | return NULL; | |
3265 | } | |
02f3fc28 PA |
3266 | } |
3267 | ||
3268 | /* Check if the current LWP has previously exited. In the nptl | |
3269 | thread model, LWPs other than the main thread do not issue | |
3270 | signals when they exit so we must check whenever the thread has | |
3271 | stopped. A similar check is made in stop_wait_callback(). */ | |
d90e17a7 | 3272 | if (num_lwps (GET_PID (lp->ptid)) > 1 && !linux_thread_alive (lp->ptid)) |
02f3fc28 | 3273 | { |
d90e17a7 PA |
3274 | ptid_t ptid = pid_to_ptid (GET_PID (lp->ptid)); |
3275 | ||
02f3fc28 PA |
3276 | if (debug_linux_nat) |
3277 | fprintf_unfiltered (gdb_stdlog, | |
3278 | "LLW: %s exited.\n", | |
3279 | target_pid_to_str (lp->ptid)); | |
3280 | ||
3281 | exit_lwp (lp); | |
3282 | ||
3283 | /* Make sure there is at least one thread running. */ | |
d90e17a7 | 3284 | gdb_assert (iterate_over_lwps (ptid, running_callback, NULL)); |
02f3fc28 PA |
3285 | |
3286 | /* Discard the event. */ | |
3287 | return NULL; | |
3288 | } | |
3289 | ||
3290 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
3291 | an attempt to stop an LWP. */ | |
3292 | if (lp->signalled | |
3293 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
3294 | { | |
3295 | if (debug_linux_nat) | |
3296 | fprintf_unfiltered (gdb_stdlog, | |
3297 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
3298 | target_pid_to_str (lp->ptid)); | |
3299 | ||
02f3fc28 PA |
3300 | lp->signalled = 0; |
3301 | ||
25289eb2 PA |
3302 | if (lp->last_resume_kind != resume_stop) |
3303 | { | |
3304 | /* This is a delayed SIGSTOP. */ | |
02f3fc28 | 3305 | |
25289eb2 PA |
3306 | registers_changed (); |
3307 | ||
3308 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
02f3fc28 | 3309 | lp->step, TARGET_SIGNAL_0); |
25289eb2 PA |
3310 | if (debug_linux_nat) |
3311 | fprintf_unfiltered (gdb_stdlog, | |
3312 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
3313 | lp->step ? | |
3314 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3315 | target_pid_to_str (lp->ptid)); | |
02f3fc28 | 3316 | |
25289eb2 PA |
3317 | lp->stopped = 0; |
3318 | gdb_assert (lp->resumed); | |
02f3fc28 | 3319 | |
25289eb2 PA |
3320 | /* Discard the event. */ |
3321 | return NULL; | |
3322 | } | |
02f3fc28 PA |
3323 | } |
3324 | ||
57380f4e DJ |
3325 | /* Make sure we don't report a SIGINT that we have already displayed |
3326 | for another thread. */ | |
3327 | if (lp->ignore_sigint | |
3328 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
3329 | { | |
3330 | if (debug_linux_nat) | |
3331 | fprintf_unfiltered (gdb_stdlog, | |
3332 | "LLW: Delayed SIGINT caught for %s.\n", | |
3333 | target_pid_to_str (lp->ptid)); | |
3334 | ||
3335 | /* This is a delayed SIGINT. */ | |
3336 | lp->ignore_sigint = 0; | |
3337 | ||
3338 | registers_changed (); | |
28439f5e | 3339 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
57380f4e DJ |
3340 | lp->step, TARGET_SIGNAL_0); |
3341 | if (debug_linux_nat) | |
3342 | fprintf_unfiltered (gdb_stdlog, | |
3343 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
3344 | lp->step ? | |
3345 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3346 | target_pid_to_str (lp->ptid)); | |
3347 | ||
3348 | lp->stopped = 0; | |
3349 | gdb_assert (lp->resumed); | |
3350 | ||
3351 | /* Discard the event. */ | |
3352 | return NULL; | |
3353 | } | |
3354 | ||
02f3fc28 PA |
3355 | /* An interesting event. */ |
3356 | gdb_assert (lp); | |
ca2163eb | 3357 | lp->status = status; |
02f3fc28 PA |
3358 | return lp; |
3359 | } | |
3360 | ||
d6b0e80f | 3361 | static ptid_t |
7feb7d06 | 3362 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
3363 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3364 | int target_options) | |
d6b0e80f | 3365 | { |
7feb7d06 | 3366 | static sigset_t prev_mask; |
d6b0e80f AC |
3367 | struct lwp_info *lp = NULL; |
3368 | int options = 0; | |
3369 | int status = 0; | |
d90e17a7 | 3370 | pid_t pid; |
d6b0e80f | 3371 | |
01124a23 | 3372 | if (debug_linux_nat) |
b84876c2 PA |
3373 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); |
3374 | ||
f973ed9c DJ |
3375 | /* The first time we get here after starting a new inferior, we may |
3376 | not have added it to the LWP list yet - this is the earliest | |
3377 | moment at which we know its PID. */ | |
d90e17a7 | 3378 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 3379 | { |
27c9d204 PA |
3380 | /* Upgrade the main thread's ptid. */ |
3381 | thread_change_ptid (inferior_ptid, | |
3382 | BUILD_LWP (GET_PID (inferior_ptid), | |
3383 | GET_PID (inferior_ptid))); | |
3384 | ||
f973ed9c DJ |
3385 | lp = add_lwp (inferior_ptid); |
3386 | lp->resumed = 1; | |
3387 | } | |
3388 | ||
7feb7d06 PA |
3389 | /* Make sure SIGCHLD is blocked. */ |
3390 | block_child_signals (&prev_mask); | |
d6b0e80f | 3391 | |
d90e17a7 PA |
3392 | if (ptid_equal (ptid, minus_one_ptid)) |
3393 | pid = -1; | |
3394 | else if (ptid_is_pid (ptid)) | |
3395 | /* A request to wait for a specific tgid. This is not possible | |
3396 | with waitpid, so instead, we wait for any child, and leave | |
3397 | children we're not interested in right now with a pending | |
3398 | status to report later. */ | |
3399 | pid = -1; | |
3400 | else | |
3401 | pid = GET_LWP (ptid); | |
3402 | ||
d6b0e80f | 3403 | retry: |
d90e17a7 PA |
3404 | lp = NULL; |
3405 | status = 0; | |
d6b0e80f | 3406 | |
e3e9f5a2 PA |
3407 | /* Make sure that of those LWPs we want to get an event from, there |
3408 | is at least one LWP that has been resumed. If there's none, just | |
3409 | bail out. The core may just be flushing asynchronously all | |
3410 | events. */ | |
3411 | if (iterate_over_lwps (ptid, resumed_callback, NULL) == NULL) | |
3412 | { | |
3413 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3414 | ||
01124a23 | 3415 | if (debug_linux_nat) |
e3e9f5a2 PA |
3416 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (no resumed LWP)\n"); |
3417 | ||
3418 | restore_child_signals_mask (&prev_mask); | |
3419 | return minus_one_ptid; | |
3420 | } | |
d6b0e80f AC |
3421 | |
3422 | /* First check if there is a LWP with a wait status pending. */ | |
3423 | if (pid == -1) | |
3424 | { | |
3425 | /* Any LWP that's been resumed will do. */ | |
d90e17a7 | 3426 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
d6b0e80f AC |
3427 | if (lp) |
3428 | { | |
ca2163eb | 3429 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3430 | fprintf_unfiltered (gdb_stdlog, |
3431 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3432 | status_to_str (lp->status), |
d6b0e80f AC |
3433 | target_pid_to_str (lp->ptid)); |
3434 | } | |
3435 | ||
b84876c2 | 3436 | /* But if we don't find one, we'll have to wait, and check both |
7feb7d06 PA |
3437 | cloned and uncloned processes. We start with the cloned |
3438 | processes. */ | |
d6b0e80f AC |
3439 | options = __WCLONE | WNOHANG; |
3440 | } | |
3441 | else if (is_lwp (ptid)) | |
3442 | { | |
3443 | if (debug_linux_nat) | |
3444 | fprintf_unfiltered (gdb_stdlog, | |
3445 | "LLW: Waiting for specific LWP %s.\n", | |
3446 | target_pid_to_str (ptid)); | |
3447 | ||
3448 | /* We have a specific LWP to check. */ | |
3449 | lp = find_lwp_pid (ptid); | |
3450 | gdb_assert (lp); | |
d6b0e80f | 3451 | |
ca2163eb | 3452 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3453 | fprintf_unfiltered (gdb_stdlog, |
3454 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3455 | status_to_str (lp->status), |
d6b0e80f AC |
3456 | target_pid_to_str (lp->ptid)); |
3457 | ||
3458 | /* If we have to wait, take into account whether PID is a cloned | |
3459 | process or not. And we have to convert it to something that | |
3460 | the layer beneath us can understand. */ | |
3461 | options = lp->cloned ? __WCLONE : 0; | |
3462 | pid = GET_LWP (ptid); | |
d90e17a7 PA |
3463 | |
3464 | /* We check for lp->waitstatus in addition to lp->status, | |
3465 | because we can have pending process exits recorded in | |
3466 | lp->status and W_EXITCODE(0,0) == 0. We should probably have | |
3467 | an additional lp->status_p flag. */ | |
ca2163eb | 3468 | if (lp->status == 0 && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) |
d90e17a7 | 3469 | lp = NULL; |
d6b0e80f AC |
3470 | } |
3471 | ||
25289eb2 | 3472 | if (lp && lp->signalled && lp->last_resume_kind != resume_stop) |
d6b0e80f AC |
3473 | { |
3474 | /* A pending SIGSTOP may interfere with the normal stream of | |
3475 | events. In a typical case where interference is a problem, | |
3476 | we have a SIGSTOP signal pending for LWP A while | |
3477 | single-stepping it, encounter an event in LWP B, and take the | |
3478 | pending SIGSTOP while trying to stop LWP A. After processing | |
3479 | the event in LWP B, LWP A is continued, and we'll never see | |
3480 | the SIGTRAP associated with the last time we were | |
3481 | single-stepping LWP A. */ | |
3482 | ||
3483 | /* Resume the thread. It should halt immediately returning the | |
3484 | pending SIGSTOP. */ | |
3485 | registers_changed (); | |
28439f5e | 3486 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3487 | lp->step, TARGET_SIGNAL_0); |
d6b0e80f AC |
3488 | if (debug_linux_nat) |
3489 | fprintf_unfiltered (gdb_stdlog, | |
3490 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
3491 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3492 | target_pid_to_str (lp->ptid)); | |
3493 | lp->stopped = 0; | |
3494 | gdb_assert (lp->resumed); | |
3495 | ||
ca2163eb PA |
3496 | /* Catch the pending SIGSTOP. */ |
3497 | status = lp->status; | |
3498 | lp->status = 0; | |
3499 | ||
d6b0e80f | 3500 | stop_wait_callback (lp, NULL); |
ca2163eb PA |
3501 | |
3502 | /* If the lp->status field isn't empty, we caught another signal | |
3503 | while flushing the SIGSTOP. Return it back to the event | |
3504 | queue of the LWP, as we already have an event to handle. */ | |
3505 | if (lp->status) | |
3506 | { | |
3507 | if (debug_linux_nat) | |
3508 | fprintf_unfiltered (gdb_stdlog, | |
3509 | "LLW: kill %s, %s\n", | |
3510 | target_pid_to_str (lp->ptid), | |
3511 | status_to_str (lp->status)); | |
3512 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
3513 | } | |
3514 | ||
3515 | lp->status = status; | |
d6b0e80f AC |
3516 | } |
3517 | ||
b84876c2 PA |
3518 | if (!target_can_async_p ()) |
3519 | { | |
3520 | /* Causes SIGINT to be passed on to the attached process. */ | |
3521 | set_sigint_trap (); | |
b84876c2 | 3522 | } |
d6b0e80f | 3523 | |
47608cb1 PA |
3524 | /* Translate generic target_wait options into waitpid options. */ |
3525 | if (target_options & TARGET_WNOHANG) | |
3526 | options |= WNOHANG; | |
7feb7d06 | 3527 | |
d90e17a7 | 3528 | while (lp == NULL) |
d6b0e80f AC |
3529 | { |
3530 | pid_t lwpid; | |
3531 | ||
7feb7d06 | 3532 | lwpid = my_waitpid (pid, &status, options); |
b84876c2 | 3533 | |
d6b0e80f AC |
3534 | if (lwpid > 0) |
3535 | { | |
3536 | gdb_assert (pid == -1 || lwpid == pid); | |
3537 | ||
3538 | if (debug_linux_nat) | |
3539 | { | |
3540 | fprintf_unfiltered (gdb_stdlog, | |
3541 | "LLW: waitpid %ld received %s\n", | |
3542 | (long) lwpid, status_to_str (status)); | |
3543 | } | |
3544 | ||
02f3fc28 | 3545 | lp = linux_nat_filter_event (lwpid, status, options); |
d90e17a7 | 3546 | |
33355866 JK |
3547 | /* STATUS is now no longer valid, use LP->STATUS instead. */ |
3548 | status = 0; | |
3549 | ||
d90e17a7 PA |
3550 | if (lp |
3551 | && ptid_is_pid (ptid) | |
3552 | && ptid_get_pid (lp->ptid) != ptid_get_pid (ptid)) | |
d6b0e80f | 3553 | { |
e3e9f5a2 PA |
3554 | gdb_assert (lp->resumed); |
3555 | ||
d90e17a7 | 3556 | if (debug_linux_nat) |
3e43a32a MS |
3557 | fprintf (stderr, |
3558 | "LWP %ld got an event %06x, leaving pending.\n", | |
33355866 | 3559 | ptid_get_lwp (lp->ptid), lp->status); |
d90e17a7 | 3560 | |
ca2163eb | 3561 | if (WIFSTOPPED (lp->status)) |
d90e17a7 | 3562 | { |
ca2163eb | 3563 | if (WSTOPSIG (lp->status) != SIGSTOP) |
d90e17a7 | 3564 | { |
e3e9f5a2 PA |
3565 | /* Cancel breakpoint hits. The breakpoint may |
3566 | be removed before we fetch events from this | |
3567 | process to report to the core. It is best | |
3568 | not to assume the moribund breakpoints | |
3569 | heuristic always handles these cases --- it | |
3570 | could be too many events go through to the | |
3571 | core before this one is handled. All-stop | |
3572 | always cancels breakpoint hits in all | |
3573 | threads. */ | |
3574 | if (non_stop | |
00390b84 | 3575 | && linux_nat_lp_status_is_event (lp) |
e3e9f5a2 PA |
3576 | && cancel_breakpoint (lp)) |
3577 | { | |
3578 | /* Throw away the SIGTRAP. */ | |
3579 | lp->status = 0; | |
3580 | ||
3581 | if (debug_linux_nat) | |
3582 | fprintf (stderr, | |
3e43a32a MS |
3583 | "LLW: LWP %ld hit a breakpoint while" |
3584 | " waiting for another process;" | |
3585 | " cancelled it\n", | |
e3e9f5a2 PA |
3586 | ptid_get_lwp (lp->ptid)); |
3587 | } | |
3588 | lp->stopped = 1; | |
d90e17a7 PA |
3589 | } |
3590 | else | |
3591 | { | |
3592 | lp->stopped = 1; | |
3593 | lp->signalled = 0; | |
3594 | } | |
3595 | } | |
33355866 | 3596 | else if (WIFEXITED (lp->status) || WIFSIGNALED (lp->status)) |
d90e17a7 PA |
3597 | { |
3598 | if (debug_linux_nat) | |
3e43a32a MS |
3599 | fprintf (stderr, |
3600 | "Process %ld exited while stopping LWPs\n", | |
d90e17a7 PA |
3601 | ptid_get_lwp (lp->ptid)); |
3602 | ||
3603 | /* This was the last lwp in the process. Since | |
3604 | events are serialized to GDB core, and we can't | |
3605 | report this one right now, but GDB core and the | |
3606 | other target layers will want to be notified | |
3607 | about the exit code/signal, leave the status | |
3608 | pending for the next time we're able to report | |
3609 | it. */ | |
d90e17a7 PA |
3610 | |
3611 | /* Prevent trying to stop this thread again. We'll | |
3612 | never try to resume it because it has a pending | |
3613 | status. */ | |
3614 | lp->stopped = 1; | |
3615 | ||
3616 | /* Dead LWP's aren't expected to reported a pending | |
3617 | sigstop. */ | |
3618 | lp->signalled = 0; | |
3619 | ||
3620 | /* Store the pending event in the waitstatus as | |
3621 | well, because W_EXITCODE(0,0) == 0. */ | |
ca2163eb | 3622 | store_waitstatus (&lp->waitstatus, lp->status); |
d90e17a7 PA |
3623 | } |
3624 | ||
3625 | /* Keep looking. */ | |
3626 | lp = NULL; | |
d6b0e80f AC |
3627 | continue; |
3628 | } | |
3629 | ||
d90e17a7 PA |
3630 | if (lp) |
3631 | break; | |
3632 | else | |
3633 | { | |
3634 | if (pid == -1) | |
3635 | { | |
3636 | /* waitpid did return something. Restart over. */ | |
3637 | options |= __WCLONE; | |
3638 | } | |
3639 | continue; | |
3640 | } | |
d6b0e80f AC |
3641 | } |
3642 | ||
3643 | if (pid == -1) | |
3644 | { | |
3645 | /* Alternate between checking cloned and uncloned processes. */ | |
3646 | options ^= __WCLONE; | |
3647 | ||
b84876c2 PA |
3648 | /* And every time we have checked both: |
3649 | In async mode, return to event loop; | |
3650 | In sync mode, suspend waiting for a SIGCHLD signal. */ | |
d6b0e80f | 3651 | if (options & __WCLONE) |
b84876c2 | 3652 | { |
47608cb1 | 3653 | if (target_options & TARGET_WNOHANG) |
b84876c2 PA |
3654 | { |
3655 | /* No interesting event. */ | |
3656 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3657 | ||
01124a23 | 3658 | if (debug_linux_nat) |
b84876c2 PA |
3659 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); |
3660 | ||
7feb7d06 | 3661 | restore_child_signals_mask (&prev_mask); |
b84876c2 PA |
3662 | return minus_one_ptid; |
3663 | } | |
3664 | ||
3665 | sigsuspend (&suspend_mask); | |
3666 | } | |
d6b0e80f | 3667 | } |
28736962 PA |
3668 | else if (target_options & TARGET_WNOHANG) |
3669 | { | |
3670 | /* No interesting event for PID yet. */ | |
3671 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
3672 | ||
01124a23 | 3673 | if (debug_linux_nat) |
28736962 PA |
3674 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); |
3675 | ||
3676 | restore_child_signals_mask (&prev_mask); | |
3677 | return minus_one_ptid; | |
3678 | } | |
d6b0e80f AC |
3679 | |
3680 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 3681 | gdb_assert (lp == NULL); |
d6b0e80f AC |
3682 | } |
3683 | ||
b84876c2 | 3684 | if (!target_can_async_p ()) |
d26b5354 | 3685 | clear_sigint_trap (); |
d6b0e80f AC |
3686 | |
3687 | gdb_assert (lp); | |
3688 | ||
ca2163eb PA |
3689 | status = lp->status; |
3690 | lp->status = 0; | |
3691 | ||
d6b0e80f AC |
3692 | /* Don't report signals that GDB isn't interested in, such as |
3693 | signals that are neither printed nor stopped upon. Stopping all | |
3694 | threads can be a bit time-consuming so if we want decent | |
3695 | performance with heavily multi-threaded programs, especially when | |
3696 | they're using a high frequency timer, we'd better avoid it if we | |
3697 | can. */ | |
3698 | ||
3699 | if (WIFSTOPPED (status)) | |
3700 | { | |
423ec54c | 3701 | enum target_signal signo = target_signal_from_host (WSTOPSIG (status)); |
d6b0e80f | 3702 | |
2455069d UW |
3703 | /* When using hardware single-step, we need to report every signal. |
3704 | Otherwise, signals in pass_mask may be short-circuited. */ | |
d539ed7e | 3705 | if (!lp->step |
2455069d | 3706 | && WSTOPSIG (status) && sigismember (&pass_mask, WSTOPSIG (status))) |
d6b0e80f AC |
3707 | { |
3708 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
3709 | here? It is not clear we should. GDB may not expect | |
3710 | other threads to run. On the other hand, not resuming | |
3711 | newly attached threads may cause an unwanted delay in | |
3712 | getting them running. */ | |
3713 | registers_changed (); | |
28439f5e | 3714 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3715 | lp->step, signo); |
d6b0e80f AC |
3716 | if (debug_linux_nat) |
3717 | fprintf_unfiltered (gdb_stdlog, | |
3718 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3719 | lp->step ? | |
3720 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3721 | target_pid_to_str (lp->ptid), | |
423ec54c JK |
3722 | (signo != TARGET_SIGNAL_0 |
3723 | ? strsignal (target_signal_to_host (signo)) | |
3724 | : "0")); | |
d6b0e80f | 3725 | lp->stopped = 0; |
d6b0e80f AC |
3726 | goto retry; |
3727 | } | |
3728 | ||
1ad15515 | 3729 | if (!non_stop) |
d6b0e80f | 3730 | { |
1ad15515 PA |
3731 | /* Only do the below in all-stop, as we currently use SIGINT |
3732 | to implement target_stop (see linux_nat_stop) in | |
3733 | non-stop. */ | |
3734 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3735 | { | |
3736 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3737 | forwarded to the entire process group, that is, all LWPs | |
3738 | will receive it - unless they're using CLONE_THREAD to | |
3739 | share signals. Since we only want to report it once, we | |
3740 | mark it as ignored for all LWPs except this one. */ | |
d90e17a7 PA |
3741 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid)), |
3742 | set_ignore_sigint, NULL); | |
1ad15515 PA |
3743 | lp->ignore_sigint = 0; |
3744 | } | |
3745 | else | |
3746 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
3747 | } |
3748 | } | |
3749 | ||
3750 | /* This LWP is stopped now. */ | |
3751 | lp->stopped = 1; | |
3752 | ||
3753 | if (debug_linux_nat) | |
3754 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
3755 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
3756 | ||
4c28f408 PA |
3757 | if (!non_stop) |
3758 | { | |
3759 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3760 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3761 | |
3762 | /* ... and wait until all of them have reported back that | |
3763 | they're no longer running. */ | |
d90e17a7 | 3764 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
4c28f408 PA |
3765 | |
3766 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3767 | from among those that have had events. Giving equal priority | |
3768 | to all LWPs that have had events helps prevent | |
3769 | starvation. */ | |
3770 | if (pid == -1) | |
d90e17a7 | 3771 | select_event_lwp (ptid, &lp, &status); |
d6b0e80f | 3772 | |
e3e9f5a2 PA |
3773 | /* Now that we've selected our final event LWP, cancel any |
3774 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
3775 | See the comment in cancel_breakpoints_callback to find out | |
3776 | why. */ | |
3777 | iterate_over_lwps (minus_one_ptid, cancel_breakpoints_callback, lp); | |
3778 | ||
3779 | /* In all-stop, from the core's perspective, all LWPs are now | |
3780 | stopped until a new resume action is sent over. */ | |
3781 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
3782 | } | |
3783 | else | |
25289eb2 PA |
3784 | { |
3785 | lp->resumed = 0; | |
3786 | lp->last_resume_kind = resume_stop; | |
3787 | } | |
d6b0e80f | 3788 | |
26ab7092 | 3789 | if (linux_nat_status_is_event (status)) |
d6b0e80f | 3790 | { |
d6b0e80f AC |
3791 | if (debug_linux_nat) |
3792 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3793 | "LLW: trap ptid is %s.\n", |
3794 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3795 | } |
d6b0e80f AC |
3796 | |
3797 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3798 | { | |
3799 | *ourstatus = lp->waitstatus; | |
3800 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3801 | } | |
3802 | else | |
3803 | store_waitstatus (ourstatus, status); | |
3804 | ||
01124a23 | 3805 | if (debug_linux_nat) |
b84876c2 PA |
3806 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); |
3807 | ||
7feb7d06 | 3808 | restore_child_signals_mask (&prev_mask); |
1e225492 | 3809 | |
25289eb2 PA |
3810 | if (lp->last_resume_kind == resume_stop |
3811 | && ourstatus->kind == TARGET_WAITKIND_STOPPED | |
3812 | && WSTOPSIG (status) == SIGSTOP) | |
3813 | { | |
3814 | /* A thread that has been requested to stop by GDB with | |
3815 | target_stop, and it stopped cleanly, so report as SIG0. The | |
3816 | use of SIGSTOP is an implementation detail. */ | |
3817 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
3818 | } | |
3819 | ||
1e225492 JK |
3820 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
3821 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
3822 | lp->core = -1; | |
3823 | else | |
3824 | lp->core = linux_nat_core_of_thread_1 (lp->ptid); | |
3825 | ||
f973ed9c | 3826 | return lp->ptid; |
d6b0e80f AC |
3827 | } |
3828 | ||
e3e9f5a2 PA |
3829 | /* Resume LWPs that are currently stopped without any pending status |
3830 | to report, but are resumed from the core's perspective. */ | |
3831 | ||
3832 | static int | |
3833 | resume_stopped_resumed_lwps (struct lwp_info *lp, void *data) | |
3834 | { | |
3835 | ptid_t *wait_ptid_p = data; | |
3836 | ||
3837 | if (lp->stopped | |
3838 | && lp->resumed | |
3839 | && lp->status == 0 | |
3840 | && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) | |
3841 | { | |
3842 | gdb_assert (is_executing (lp->ptid)); | |
3843 | ||
3844 | /* Don't bother if there's a breakpoint at PC that we'd hit | |
3845 | immediately, and we're not waiting for this LWP. */ | |
3846 | if (!ptid_match (lp->ptid, *wait_ptid_p)) | |
3847 | { | |
3848 | struct regcache *regcache = get_thread_regcache (lp->ptid); | |
3849 | CORE_ADDR pc = regcache_read_pc (regcache); | |
3850 | ||
3851 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) | |
3852 | return 0; | |
3853 | } | |
3854 | ||
3855 | if (debug_linux_nat) | |
3856 | fprintf_unfiltered (gdb_stdlog, | |
3857 | "RSRL: resuming stopped-resumed LWP %s\n", | |
3858 | target_pid_to_str (lp->ptid)); | |
3859 | ||
3860 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
3861 | lp->step, TARGET_SIGNAL_0); | |
3862 | lp->stopped = 0; | |
3863 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
3864 | lp->stopped_by_watchpoint = 0; | |
3865 | } | |
3866 | ||
3867 | return 0; | |
3868 | } | |
3869 | ||
7feb7d06 PA |
3870 | static ptid_t |
3871 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3872 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3873 | int target_options) | |
7feb7d06 PA |
3874 | { |
3875 | ptid_t event_ptid; | |
3876 | ||
3877 | if (debug_linux_nat) | |
3e43a32a MS |
3878 | fprintf_unfiltered (gdb_stdlog, |
3879 | "linux_nat_wait: [%s]\n", target_pid_to_str (ptid)); | |
7feb7d06 PA |
3880 | |
3881 | /* Flush the async file first. */ | |
3882 | if (target_can_async_p ()) | |
3883 | async_file_flush (); | |
3884 | ||
e3e9f5a2 PA |
3885 | /* Resume LWPs that are currently stopped without any pending status |
3886 | to report, but are resumed from the core's perspective. LWPs get | |
3887 | in this state if we find them stopping at a time we're not | |
3888 | interested in reporting the event (target_wait on a | |
3889 | specific_process, for example, see linux_nat_wait_1), and | |
3890 | meanwhile the event became uninteresting. Don't bother resuming | |
3891 | LWPs we're not going to wait for if they'd stop immediately. */ | |
3892 | if (non_stop) | |
3893 | iterate_over_lwps (minus_one_ptid, resume_stopped_resumed_lwps, &ptid); | |
3894 | ||
47608cb1 | 3895 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3896 | |
3897 | /* If we requested any event, and something came out, assume there | |
3898 | may be more. If we requested a specific lwp or process, also | |
3899 | assume there may be more. */ | |
3900 | if (target_can_async_p () | |
3901 | && (ourstatus->kind != TARGET_WAITKIND_IGNORE | |
3902 | || !ptid_equal (ptid, minus_one_ptid))) | |
3903 | async_file_mark (); | |
3904 | ||
3905 | /* Get ready for the next event. */ | |
3906 | if (target_can_async_p ()) | |
3907 | target_async (inferior_event_handler, 0); | |
3908 | ||
3909 | return event_ptid; | |
3910 | } | |
3911 | ||
d6b0e80f AC |
3912 | static int |
3913 | kill_callback (struct lwp_info *lp, void *data) | |
3914 | { | |
ed731959 JK |
3915 | /* PTRACE_KILL may resume the inferior. Send SIGKILL first. */ |
3916 | ||
3917 | errno = 0; | |
3918 | kill (GET_LWP (lp->ptid), SIGKILL); | |
3919 | if (debug_linux_nat) | |
3920 | fprintf_unfiltered (gdb_stdlog, | |
3921 | "KC: kill (SIGKILL) %s, 0, 0 (%s)\n", | |
3922 | target_pid_to_str (lp->ptid), | |
3923 | errno ? safe_strerror (errno) : "OK"); | |
3924 | ||
3925 | /* Some kernels ignore even SIGKILL for processes under ptrace. */ | |
3926 | ||
d6b0e80f AC |
3927 | errno = 0; |
3928 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
3929 | if (debug_linux_nat) | |
3930 | fprintf_unfiltered (gdb_stdlog, | |
3931 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
3932 | target_pid_to_str (lp->ptid), | |
3933 | errno ? safe_strerror (errno) : "OK"); | |
3934 | ||
3935 | return 0; | |
3936 | } | |
3937 | ||
3938 | static int | |
3939 | kill_wait_callback (struct lwp_info *lp, void *data) | |
3940 | { | |
3941 | pid_t pid; | |
3942 | ||
3943 | /* We must make sure that there are no pending events (delayed | |
3944 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
3945 | program doesn't interfere with any following debugging session. */ | |
3946 | ||
3947 | /* For cloned processes we must check both with __WCLONE and | |
3948 | without, since the exit status of a cloned process isn't reported | |
3949 | with __WCLONE. */ | |
3950 | if (lp->cloned) | |
3951 | { | |
3952 | do | |
3953 | { | |
58aecb61 | 3954 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 3955 | if (pid != (pid_t) -1) |
d6b0e80f | 3956 | { |
e85a822c DJ |
3957 | if (debug_linux_nat) |
3958 | fprintf_unfiltered (gdb_stdlog, | |
3959 | "KWC: wait %s received unknown.\n", | |
3960 | target_pid_to_str (lp->ptid)); | |
3961 | /* The Linux kernel sometimes fails to kill a thread | |
3962 | completely after PTRACE_KILL; that goes from the stop | |
3963 | point in do_fork out to the one in | |
3964 | get_signal_to_deliever and waits again. So kill it | |
3965 | again. */ | |
3966 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3967 | } |
3968 | } | |
3969 | while (pid == GET_LWP (lp->ptid)); | |
3970 | ||
3971 | gdb_assert (pid == -1 && errno == ECHILD); | |
3972 | } | |
3973 | ||
3974 | do | |
3975 | { | |
58aecb61 | 3976 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 3977 | if (pid != (pid_t) -1) |
d6b0e80f | 3978 | { |
e85a822c DJ |
3979 | if (debug_linux_nat) |
3980 | fprintf_unfiltered (gdb_stdlog, | |
3981 | "KWC: wait %s received unk.\n", | |
3982 | target_pid_to_str (lp->ptid)); | |
3983 | /* See the call to kill_callback above. */ | |
3984 | kill_callback (lp, NULL); | |
d6b0e80f AC |
3985 | } |
3986 | } | |
3987 | while (pid == GET_LWP (lp->ptid)); | |
3988 | ||
3989 | gdb_assert (pid == -1 && errno == ECHILD); | |
3990 | return 0; | |
3991 | } | |
3992 | ||
3993 | static void | |
7d85a9c0 | 3994 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 3995 | { |
f973ed9c DJ |
3996 | struct target_waitstatus last; |
3997 | ptid_t last_ptid; | |
3998 | int status; | |
d6b0e80f | 3999 | |
f973ed9c DJ |
4000 | /* If we're stopped while forking and we haven't followed yet, |
4001 | kill the other task. We need to do this first because the | |
4002 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 4003 | |
f973ed9c | 4004 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 4005 | |
f973ed9c DJ |
4006 | if (last.kind == TARGET_WAITKIND_FORKED |
4007 | || last.kind == TARGET_WAITKIND_VFORKED) | |
4008 | { | |
3a3e9ee3 | 4009 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
4010 | wait (&status); |
4011 | } | |
4012 | ||
4013 | if (forks_exist_p ()) | |
7feb7d06 | 4014 | linux_fork_killall (); |
f973ed9c DJ |
4015 | else |
4016 | { | |
d90e17a7 | 4017 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
e0881a8e | 4018 | |
4c28f408 PA |
4019 | /* Stop all threads before killing them, since ptrace requires |
4020 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 4021 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
4022 | /* ... and wait until all of them have reported back that |
4023 | they're no longer running. */ | |
d90e17a7 | 4024 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 4025 | |
f973ed9c | 4026 | /* Kill all LWP's ... */ |
d90e17a7 | 4027 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
4028 | |
4029 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 4030 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
4031 | } |
4032 | ||
4033 | target_mourn_inferior (); | |
d6b0e80f AC |
4034 | } |
4035 | ||
4036 | static void | |
136d6dae | 4037 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 4038 | { |
d90e17a7 | 4039 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
d6b0e80f | 4040 | |
f973ed9c | 4041 | if (! forks_exist_p ()) |
d90e17a7 PA |
4042 | /* Normal case, no other forks available. */ |
4043 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
4044 | else |
4045 | /* Multi-fork case. The current inferior_ptid has exited, but | |
4046 | there are other viable forks to debug. Delete the exiting | |
4047 | one and context-switch to the first available. */ | |
4048 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
4049 | } |
4050 | ||
5b009018 PA |
4051 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4052 | layout of the inferiors' architecture. */ | |
4053 | ||
4054 | static void | |
4055 | siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction) | |
4056 | { | |
4057 | int done = 0; | |
4058 | ||
4059 | if (linux_nat_siginfo_fixup != NULL) | |
4060 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
4061 | ||
4062 | /* If there was no callback, or the callback didn't do anything, | |
4063 | then just do a straight memcpy. */ | |
4064 | if (!done) | |
4065 | { | |
4066 | if (direction == 1) | |
4067 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
4068 | else | |
4069 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
4070 | } | |
4071 | } | |
4072 | ||
4aa995e1 PA |
4073 | static LONGEST |
4074 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, | |
4075 | const char *annex, gdb_byte *readbuf, | |
4076 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4077 | { | |
4aa995e1 PA |
4078 | int pid; |
4079 | struct siginfo siginfo; | |
5b009018 | 4080 | gdb_byte inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
4081 | |
4082 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
4083 | gdb_assert (readbuf || writebuf); | |
4084 | ||
4085 | pid = GET_LWP (inferior_ptid); | |
4086 | if (pid == 0) | |
4087 | pid = GET_PID (inferior_ptid); | |
4088 | ||
4089 | if (offset > sizeof (siginfo)) | |
4090 | return -1; | |
4091 | ||
4092 | errno = 0; | |
4093 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
4094 | if (errno != 0) | |
4095 | return -1; | |
4096 | ||
5b009018 PA |
4097 | /* When GDB is built as a 64-bit application, ptrace writes into |
4098 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4099 | inferior with a 64-bit GDB should look the same as debugging it | |
4100 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
4101 | the converted layout, so any read/write will have to be done | |
4102 | post-conversion. */ | |
4103 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4104 | ||
4aa995e1 PA |
4105 | if (offset + len > sizeof (siginfo)) |
4106 | len = sizeof (siginfo) - offset; | |
4107 | ||
4108 | if (readbuf != NULL) | |
5b009018 | 4109 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4110 | else |
4111 | { | |
5b009018 PA |
4112 | memcpy (inf_siginfo + offset, writebuf, len); |
4113 | ||
4114 | /* Convert back to ptrace layout before flushing it out. */ | |
4115 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4116 | ||
4aa995e1 PA |
4117 | errno = 0; |
4118 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
4119 | if (errno != 0) | |
4120 | return -1; | |
4121 | } | |
4122 | ||
4123 | return len; | |
4124 | } | |
4125 | ||
10d6c8cd DJ |
4126 | static LONGEST |
4127 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
4128 | const char *annex, gdb_byte *readbuf, | |
4129 | const gdb_byte *writebuf, | |
4130 | ULONGEST offset, LONGEST len) | |
d6b0e80f | 4131 | { |
4aa995e1 | 4132 | struct cleanup *old_chain; |
10d6c8cd | 4133 | LONGEST xfer; |
d6b0e80f | 4134 | |
4aa995e1 PA |
4135 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
4136 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
4137 | offset, len); | |
4138 | ||
c35b1492 PA |
4139 | /* The target is connected but no live inferior is selected. Pass |
4140 | this request down to a lower stratum (e.g., the executable | |
4141 | file). */ | |
4142 | if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid)) | |
4143 | return 0; | |
4144 | ||
4aa995e1 PA |
4145 | old_chain = save_inferior_ptid (); |
4146 | ||
d6b0e80f AC |
4147 | if (is_lwp (inferior_ptid)) |
4148 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
4149 | ||
10d6c8cd DJ |
4150 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
4151 | offset, len); | |
d6b0e80f AC |
4152 | |
4153 | do_cleanups (old_chain); | |
4154 | return xfer; | |
4155 | } | |
4156 | ||
4157 | static int | |
28439f5e | 4158 | linux_thread_alive (ptid_t ptid) |
d6b0e80f | 4159 | { |
8c6a60d1 | 4160 | int err, tmp_errno; |
4c28f408 | 4161 | |
d6b0e80f AC |
4162 | gdb_assert (is_lwp (ptid)); |
4163 | ||
4c28f408 PA |
4164 | /* Send signal 0 instead of anything ptrace, because ptracing a |
4165 | running thread errors out claiming that the thread doesn't | |
4166 | exist. */ | |
4167 | err = kill_lwp (GET_LWP (ptid), 0); | |
8c6a60d1 | 4168 | tmp_errno = errno; |
d6b0e80f AC |
4169 | if (debug_linux_nat) |
4170 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 4171 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 4172 | target_pid_to_str (ptid), |
8c6a60d1 | 4173 | err ? safe_strerror (tmp_errno) : "OK"); |
9c0dd46b | 4174 | |
4c28f408 | 4175 | if (err != 0) |
d6b0e80f AC |
4176 | return 0; |
4177 | ||
4178 | return 1; | |
4179 | } | |
4180 | ||
28439f5e PA |
4181 | static int |
4182 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
4183 | { | |
4184 | return linux_thread_alive (ptid); | |
4185 | } | |
4186 | ||
d6b0e80f | 4187 | static char * |
117de6a9 | 4188 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
4189 | { |
4190 | static char buf[64]; | |
4191 | ||
a0ef4274 | 4192 | if (is_lwp (ptid) |
d90e17a7 PA |
4193 | && (GET_PID (ptid) != GET_LWP (ptid) |
4194 | || num_lwps (GET_PID (ptid)) > 1)) | |
d6b0e80f AC |
4195 | { |
4196 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
4197 | return buf; | |
4198 | } | |
4199 | ||
4200 | return normal_pid_to_str (ptid); | |
4201 | } | |
4202 | ||
4694da01 TT |
4203 | static char * |
4204 | linux_nat_thread_name (struct thread_info *thr) | |
4205 | { | |
4206 | int pid = ptid_get_pid (thr->ptid); | |
4207 | long lwp = ptid_get_lwp (thr->ptid); | |
4208 | #define FORMAT "/proc/%d/task/%ld/comm" | |
4209 | char buf[sizeof (FORMAT) + 30]; | |
4210 | FILE *comm_file; | |
4211 | char *result = NULL; | |
4212 | ||
4213 | snprintf (buf, sizeof (buf), FORMAT, pid, lwp); | |
4214 | comm_file = fopen (buf, "r"); | |
4215 | if (comm_file) | |
4216 | { | |
4217 | /* Not exported by the kernel, so we define it here. */ | |
4218 | #define COMM_LEN 16 | |
4219 | static char line[COMM_LEN + 1]; | |
4220 | ||
4221 | if (fgets (line, sizeof (line), comm_file)) | |
4222 | { | |
4223 | char *nl = strchr (line, '\n'); | |
4224 | ||
4225 | if (nl) | |
4226 | *nl = '\0'; | |
4227 | if (*line != '\0') | |
4228 | result = line; | |
4229 | } | |
4230 | ||
4231 | fclose (comm_file); | |
4232 | } | |
4233 | ||
4234 | #undef COMM_LEN | |
4235 | #undef FORMAT | |
4236 | ||
4237 | return result; | |
4238 | } | |
4239 | ||
dba24537 AC |
4240 | /* Accepts an integer PID; Returns a string representing a file that |
4241 | can be opened to get the symbols for the child process. */ | |
4242 | ||
6d8fd2b7 UW |
4243 | static char * |
4244 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
4245 | { |
4246 | char *name1, *name2; | |
4247 | ||
4248 | name1 = xmalloc (MAXPATHLEN); | |
4249 | name2 = xmalloc (MAXPATHLEN); | |
4250 | make_cleanup (xfree, name1); | |
4251 | make_cleanup (xfree, name2); | |
4252 | memset (name2, 0, MAXPATHLEN); | |
4253 | ||
4254 | sprintf (name1, "/proc/%d/exe", pid); | |
4255 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
4256 | return name2; | |
4257 | else | |
4258 | return name1; | |
4259 | } | |
4260 | ||
4261 | /* Service function for corefiles and info proc. */ | |
4262 | ||
4263 | static int | |
4264 | read_mapping (FILE *mapfile, | |
4265 | long long *addr, | |
4266 | long long *endaddr, | |
4267 | char *permissions, | |
4268 | long long *offset, | |
4269 | char *device, long long *inode, char *filename) | |
4270 | { | |
4271 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
4272 | addr, endaddr, permissions, offset, device, inode); | |
4273 | ||
2e14c2ea MS |
4274 | filename[0] = '\0'; |
4275 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
4276 | { |
4277 | /* Eat everything up to EOL for the filename. This will prevent | |
4278 | weird filenames (such as one with embedded whitespace) from | |
4279 | confusing this code. It also makes this code more robust in | |
4280 | respect to annotations the kernel may add after the filename. | |
4281 | ||
4282 | Note the filename is used for informational purposes | |
4283 | only. */ | |
4284 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
4285 | } | |
2e14c2ea | 4286 | |
dba24537 AC |
4287 | return (ret != 0 && ret != EOF); |
4288 | } | |
4289 | ||
4290 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
4291 | regions in the inferior for a corefile. */ | |
4292 | ||
4293 | static int | |
b8edc417 | 4294 | linux_nat_find_memory_regions (find_memory_region_ftype func, void *obfd) |
dba24537 | 4295 | { |
89ecc4f5 | 4296 | int pid = PIDGET (inferior_ptid); |
dba24537 AC |
4297 | char mapsfilename[MAXPATHLEN]; |
4298 | FILE *mapsfile; | |
4299 | long long addr, endaddr, size, offset, inode; | |
4300 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
4301 | int read, write, exec; | |
7c8a8b04 | 4302 | struct cleanup *cleanup; |
dba24537 AC |
4303 | |
4304 | /* Compose the filename for the /proc memory map, and open it. */ | |
89ecc4f5 | 4305 | sprintf (mapsfilename, "/proc/%d/maps", pid); |
dba24537 | 4306 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) |
8a3fe4f8 | 4307 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 4308 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
4309 | |
4310 | if (info_verbose) | |
4311 | fprintf_filtered (gdb_stdout, | |
4312 | "Reading memory regions from %s\n", mapsfilename); | |
4313 | ||
4314 | /* Now iterate until end-of-file. */ | |
4315 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
4316 | &offset, &device[0], &inode, &filename[0])) | |
4317 | { | |
4318 | size = endaddr - addr; | |
4319 | ||
4320 | /* Get the segment's permissions. */ | |
4321 | read = (strchr (permissions, 'r') != 0); | |
4322 | write = (strchr (permissions, 'w') != 0); | |
4323 | exec = (strchr (permissions, 'x') != 0); | |
4324 | ||
4325 | if (info_verbose) | |
4326 | { | |
4327 | fprintf_filtered (gdb_stdout, | |
2244ba2e PM |
4328 | "Save segment, %s bytes at %s (%c%c%c)", |
4329 | plongest (size), paddress (target_gdbarch, addr), | |
dba24537 AC |
4330 | read ? 'r' : ' ', |
4331 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 4332 | if (filename[0]) |
dba24537 AC |
4333 | fprintf_filtered (gdb_stdout, " for %s", filename); |
4334 | fprintf_filtered (gdb_stdout, "\n"); | |
4335 | } | |
4336 | ||
4337 | /* Invoke the callback function to create the corefile | |
4338 | segment. */ | |
4339 | func (addr, size, read, write, exec, obfd); | |
4340 | } | |
7c8a8b04 | 4341 | do_cleanups (cleanup); |
dba24537 AC |
4342 | return 0; |
4343 | } | |
4344 | ||
2020b7ab PA |
4345 | static int |
4346 | find_signalled_thread (struct thread_info *info, void *data) | |
4347 | { | |
16c381f0 | 4348 | if (info->suspend.stop_signal != TARGET_SIGNAL_0 |
2020b7ab PA |
4349 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) |
4350 | return 1; | |
4351 | ||
4352 | return 0; | |
4353 | } | |
4354 | ||
4355 | static enum target_signal | |
4356 | find_stop_signal (void) | |
4357 | { | |
4358 | struct thread_info *info = | |
4359 | iterate_over_threads (find_signalled_thread, NULL); | |
4360 | ||
4361 | if (info) | |
16c381f0 | 4362 | return info->suspend.stop_signal; |
2020b7ab PA |
4363 | else |
4364 | return TARGET_SIGNAL_0; | |
4365 | } | |
4366 | ||
dba24537 AC |
4367 | /* Records the thread's register state for the corefile note |
4368 | section. */ | |
4369 | ||
4370 | static char * | |
4371 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
4372 | char *note_data, int *note_size, |
4373 | enum target_signal stop_signal) | |
dba24537 | 4374 | { |
dba24537 | 4375 | unsigned long lwp = ptid_get_lwp (ptid); |
c2250ad1 UW |
4376 | struct gdbarch *gdbarch = target_gdbarch; |
4377 | struct regcache *regcache = get_thread_arch_regcache (ptid, gdbarch); | |
4f844a66 | 4378 | const struct regset *regset; |
55e969c1 | 4379 | int core_regset_p; |
594f7785 | 4380 | struct cleanup *old_chain; |
17ea7499 CES |
4381 | struct core_regset_section *sect_list; |
4382 | char *gdb_regset; | |
594f7785 UW |
4383 | |
4384 | old_chain = save_inferior_ptid (); | |
4385 | inferior_ptid = ptid; | |
4386 | target_fetch_registers (regcache, -1); | |
4387 | do_cleanups (old_chain); | |
4f844a66 DM |
4388 | |
4389 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
4390 | sect_list = gdbarch_core_regset_sections (gdbarch); |
4391 | ||
17ea7499 CES |
4392 | /* The loop below uses the new struct core_regset_section, which stores |
4393 | the supported section names and sizes for the core file. Note that | |
4394 | note PRSTATUS needs to be treated specially. But the other notes are | |
4395 | structurally the same, so they can benefit from the new struct. */ | |
4396 | if (core_regset_p && sect_list != NULL) | |
4397 | while (sect_list->sect_name != NULL) | |
4398 | { | |
17ea7499 CES |
4399 | regset = gdbarch_regset_from_core_section (gdbarch, |
4400 | sect_list->sect_name, | |
4401 | sect_list->size); | |
4402 | gdb_assert (regset && regset->collect_regset); | |
4403 | gdb_regset = xmalloc (sect_list->size); | |
4404 | regset->collect_regset (regset, regcache, -1, | |
4405 | gdb_regset, sect_list->size); | |
2f2241f1 UW |
4406 | |
4407 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
4408 | note_data = (char *) elfcore_write_prstatus | |
4409 | (obfd, note_data, note_size, | |
857d11d0 JK |
4410 | lwp, target_signal_to_host (stop_signal), |
4411 | gdb_regset); | |
2f2241f1 UW |
4412 | else |
4413 | note_data = (char *) elfcore_write_register_note | |
4414 | (obfd, note_data, note_size, | |
4415 | sect_list->sect_name, gdb_regset, | |
4416 | sect_list->size); | |
17ea7499 CES |
4417 | xfree (gdb_regset); |
4418 | sect_list++; | |
4419 | } | |
dba24537 | 4420 | |
17ea7499 CES |
4421 | /* For architectures that does not have the struct core_regset_section |
4422 | implemented, we use the old method. When all the architectures have | |
4423 | the new support, the code below should be deleted. */ | |
4f844a66 | 4424 | else |
17ea7499 | 4425 | { |
2f2241f1 UW |
4426 | gdb_gregset_t gregs; |
4427 | gdb_fpregset_t fpregs; | |
4428 | ||
4429 | if (core_regset_p | |
4430 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
3e43a32a MS |
4431 | sizeof (gregs))) |
4432 | != NULL && regset->collect_regset != NULL) | |
2f2241f1 UW |
4433 | regset->collect_regset (regset, regcache, -1, |
4434 | &gregs, sizeof (gregs)); | |
4435 | else | |
4436 | fill_gregset (regcache, &gregs, -1); | |
4437 | ||
857d11d0 JK |
4438 | note_data = (char *) elfcore_write_prstatus |
4439 | (obfd, note_data, note_size, lwp, target_signal_to_host (stop_signal), | |
4440 | &gregs); | |
2f2241f1 | 4441 | |
17ea7499 CES |
4442 | if (core_regset_p |
4443 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
3e43a32a MS |
4444 | sizeof (fpregs))) |
4445 | != NULL && regset->collect_regset != NULL) | |
17ea7499 CES |
4446 | regset->collect_regset (regset, regcache, -1, |
4447 | &fpregs, sizeof (fpregs)); | |
4448 | else | |
4449 | fill_fpregset (regcache, &fpregs, -1); | |
4450 | ||
4451 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
4452 | note_data, | |
4453 | note_size, | |
4454 | &fpregs, sizeof (fpregs)); | |
4455 | } | |
4f844a66 | 4456 | |
dba24537 AC |
4457 | return note_data; |
4458 | } | |
4459 | ||
4460 | struct linux_nat_corefile_thread_data | |
4461 | { | |
4462 | bfd *obfd; | |
4463 | char *note_data; | |
4464 | int *note_size; | |
4465 | int num_notes; | |
2020b7ab | 4466 | enum target_signal stop_signal; |
dba24537 AC |
4467 | }; |
4468 | ||
4469 | /* Called by gdbthread.c once per thread. Records the thread's | |
4470 | register state for the corefile note section. */ | |
4471 | ||
4472 | static int | |
4473 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
4474 | { | |
4475 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 4476 | |
dba24537 AC |
4477 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
4478 | ti->ptid, | |
4479 | args->note_data, | |
2020b7ab PA |
4480 | args->note_size, |
4481 | args->stop_signal); | |
dba24537 | 4482 | args->num_notes++; |
56be3814 | 4483 | |
dba24537 AC |
4484 | return 0; |
4485 | } | |
4486 | ||
efcbbd14 UW |
4487 | /* Enumerate spufs IDs for process PID. */ |
4488 | ||
4489 | static void | |
4490 | iterate_over_spus (int pid, void (*callback) (void *, int), void *data) | |
4491 | { | |
4492 | char path[128]; | |
4493 | DIR *dir; | |
4494 | struct dirent *entry; | |
4495 | ||
4496 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4497 | dir = opendir (path); | |
4498 | if (!dir) | |
4499 | return; | |
4500 | ||
4501 | rewinddir (dir); | |
4502 | while ((entry = readdir (dir)) != NULL) | |
4503 | { | |
4504 | struct stat st; | |
4505 | struct statfs stfs; | |
4506 | int fd; | |
4507 | ||
4508 | fd = atoi (entry->d_name); | |
4509 | if (!fd) | |
4510 | continue; | |
4511 | ||
4512 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4513 | if (stat (path, &st) != 0) | |
4514 | continue; | |
4515 | if (!S_ISDIR (st.st_mode)) | |
4516 | continue; | |
4517 | ||
4518 | if (statfs (path, &stfs) != 0) | |
4519 | continue; | |
4520 | if (stfs.f_type != SPUFS_MAGIC) | |
4521 | continue; | |
4522 | ||
4523 | callback (data, fd); | |
4524 | } | |
4525 | ||
4526 | closedir (dir); | |
4527 | } | |
4528 | ||
4529 | /* Generate corefile notes for SPU contexts. */ | |
4530 | ||
4531 | struct linux_spu_corefile_data | |
4532 | { | |
4533 | bfd *obfd; | |
4534 | char *note_data; | |
4535 | int *note_size; | |
4536 | }; | |
4537 | ||
4538 | static void | |
4539 | linux_spu_corefile_callback (void *data, int fd) | |
4540 | { | |
4541 | struct linux_spu_corefile_data *args = data; | |
4542 | int i; | |
4543 | ||
4544 | static const char *spu_files[] = | |
4545 | { | |
4546 | "object-id", | |
4547 | "mem", | |
4548 | "regs", | |
4549 | "fpcr", | |
4550 | "lslr", | |
4551 | "decr", | |
4552 | "decr_status", | |
4553 | "signal1", | |
4554 | "signal1_type", | |
4555 | "signal2", | |
4556 | "signal2_type", | |
4557 | "event_mask", | |
4558 | "event_status", | |
4559 | "mbox_info", | |
4560 | "ibox_info", | |
4561 | "wbox_info", | |
4562 | "dma_info", | |
4563 | "proxydma_info", | |
4564 | }; | |
4565 | ||
4566 | for (i = 0; i < sizeof (spu_files) / sizeof (spu_files[0]); i++) | |
4567 | { | |
4568 | char annex[32], note_name[32]; | |
4569 | gdb_byte *spu_data; | |
4570 | LONGEST spu_len; | |
4571 | ||
4572 | xsnprintf (annex, sizeof annex, "%d/%s", fd, spu_files[i]); | |
4573 | spu_len = target_read_alloc (¤t_target, TARGET_OBJECT_SPU, | |
4574 | annex, &spu_data); | |
4575 | if (spu_len > 0) | |
4576 | { | |
4577 | xsnprintf (note_name, sizeof note_name, "SPU/%s", annex); | |
4578 | args->note_data = elfcore_write_note (args->obfd, args->note_data, | |
4579 | args->note_size, note_name, | |
4580 | NT_SPU, spu_data, spu_len); | |
4581 | xfree (spu_data); | |
4582 | } | |
4583 | } | |
4584 | } | |
4585 | ||
4586 | static char * | |
4587 | linux_spu_make_corefile_notes (bfd *obfd, char *note_data, int *note_size) | |
4588 | { | |
4589 | struct linux_spu_corefile_data args; | |
e0881a8e | 4590 | |
efcbbd14 UW |
4591 | args.obfd = obfd; |
4592 | args.note_data = note_data; | |
4593 | args.note_size = note_size; | |
4594 | ||
4595 | iterate_over_spus (PIDGET (inferior_ptid), | |
4596 | linux_spu_corefile_callback, &args); | |
4597 | ||
4598 | return args.note_data; | |
4599 | } | |
4600 | ||
dba24537 AC |
4601 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
4602 | section for a corefile, and returns it in a malloc buffer. */ | |
4603 | ||
4604 | static char * | |
4605 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
4606 | { | |
4607 | struct linux_nat_corefile_thread_data thread_args; | |
d99148ef | 4608 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 4609 | char fname[16] = { '\0' }; |
d99148ef | 4610 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
4611 | char psargs[80] = { '\0' }; |
4612 | char *note_data = NULL; | |
d90e17a7 | 4613 | ptid_t filter = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
c6826062 | 4614 | gdb_byte *auxv; |
dba24537 AC |
4615 | int auxv_len; |
4616 | ||
4617 | if (get_exec_file (0)) | |
4618 | { | |
9f37bbcc | 4619 | strncpy (fname, lbasename (get_exec_file (0)), sizeof (fname)); |
dba24537 AC |
4620 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); |
4621 | if (get_inferior_args ()) | |
4622 | { | |
d99148ef JK |
4623 | char *string_end; |
4624 | char *psargs_end = psargs + sizeof (psargs); | |
4625 | ||
4626 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
4627 | strings fine. */ | |
4628 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
4629 | if (string_end != NULL) | |
4630 | { | |
4631 | *string_end++ = ' '; | |
4632 | strncpy (string_end, get_inferior_args (), | |
4633 | psargs_end - string_end); | |
4634 | } | |
dba24537 AC |
4635 | } |
4636 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
4637 | note_data, | |
4638 | note_size, fname, psargs); | |
4639 | } | |
4640 | ||
4641 | /* Dump information for threads. */ | |
4642 | thread_args.obfd = obfd; | |
4643 | thread_args.note_data = note_data; | |
4644 | thread_args.note_size = note_size; | |
4645 | thread_args.num_notes = 0; | |
2020b7ab | 4646 | thread_args.stop_signal = find_stop_signal (); |
d90e17a7 | 4647 | iterate_over_lwps (filter, linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
4648 | gdb_assert (thread_args.num_notes != 0); |
4649 | note_data = thread_args.note_data; | |
dba24537 | 4650 | |
13547ab6 DJ |
4651 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
4652 | NULL, &auxv); | |
dba24537 AC |
4653 | if (auxv_len > 0) |
4654 | { | |
4655 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
4656 | "CORE", NT_AUXV, auxv, auxv_len); | |
4657 | xfree (auxv); | |
4658 | } | |
4659 | ||
efcbbd14 UW |
4660 | note_data = linux_spu_make_corefile_notes (obfd, note_data, note_size); |
4661 | ||
dba24537 AC |
4662 | make_cleanup (xfree, note_data); |
4663 | return note_data; | |
4664 | } | |
4665 | ||
4666 | /* Implement the "info proc" command. */ | |
4667 | ||
4668 | static void | |
4669 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
4670 | { | |
89ecc4f5 DE |
4671 | /* A long is used for pid instead of an int to avoid a loss of precision |
4672 | compiler warning from the output of strtoul. */ | |
4673 | long pid = PIDGET (inferior_ptid); | |
dba24537 AC |
4674 | FILE *procfile; |
4675 | char **argv = NULL; | |
4676 | char buffer[MAXPATHLEN]; | |
4677 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
4678 | int cmdline_f = 1; | |
4679 | int cwd_f = 1; | |
4680 | int exe_f = 1; | |
4681 | int mappings_f = 0; | |
dba24537 AC |
4682 | int status_f = 0; |
4683 | int stat_f = 0; | |
4684 | int all = 0; | |
4685 | struct stat dummy; | |
4686 | ||
4687 | if (args) | |
4688 | { | |
4689 | /* Break up 'args' into an argv array. */ | |
d1a41061 PP |
4690 | argv = gdb_buildargv (args); |
4691 | make_cleanup_freeargv (argv); | |
dba24537 AC |
4692 | } |
4693 | while (argv != NULL && *argv != NULL) | |
4694 | { | |
4695 | if (isdigit (argv[0][0])) | |
4696 | { | |
4697 | pid = strtoul (argv[0], NULL, 10); | |
4698 | } | |
4699 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
4700 | { | |
4701 | mappings_f = 1; | |
4702 | } | |
4703 | else if (strcmp (argv[0], "status") == 0) | |
4704 | { | |
4705 | status_f = 1; | |
4706 | } | |
4707 | else if (strcmp (argv[0], "stat") == 0) | |
4708 | { | |
4709 | stat_f = 1; | |
4710 | } | |
4711 | else if (strcmp (argv[0], "cmd") == 0) | |
4712 | { | |
4713 | cmdline_f = 1; | |
4714 | } | |
4715 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
4716 | { | |
4717 | exe_f = 1; | |
4718 | } | |
4719 | else if (strcmp (argv[0], "cwd") == 0) | |
4720 | { | |
4721 | cwd_f = 1; | |
4722 | } | |
4723 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
4724 | { | |
4725 | all = 1; | |
4726 | } | |
4727 | else | |
4728 | { | |
1777feb0 | 4729 | /* [...] (future options here). */ |
dba24537 AC |
4730 | } |
4731 | argv++; | |
4732 | } | |
4733 | if (pid == 0) | |
8a3fe4f8 | 4734 | error (_("No current process: you must name one.")); |
dba24537 | 4735 | |
89ecc4f5 | 4736 | sprintf (fname1, "/proc/%ld", pid); |
dba24537 | 4737 | if (stat (fname1, &dummy) != 0) |
8a3fe4f8 | 4738 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 4739 | |
89ecc4f5 | 4740 | printf_filtered (_("process %ld\n"), pid); |
dba24537 AC |
4741 | if (cmdline_f || all) |
4742 | { | |
89ecc4f5 | 4743 | sprintf (fname1, "/proc/%ld/cmdline", pid); |
d5d6fca5 | 4744 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4745 | { |
7c8a8b04 | 4746 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
e0881a8e | 4747 | |
bf1d7d9c JB |
4748 | if (fgets (buffer, sizeof (buffer), procfile)) |
4749 | printf_filtered ("cmdline = '%s'\n", buffer); | |
4750 | else | |
4751 | warning (_("unable to read '%s'"), fname1); | |
7c8a8b04 | 4752 | do_cleanups (cleanup); |
dba24537 AC |
4753 | } |
4754 | else | |
8a3fe4f8 | 4755 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4756 | } |
4757 | if (cwd_f || all) | |
4758 | { | |
89ecc4f5 | 4759 | sprintf (fname1, "/proc/%ld/cwd", pid); |
dba24537 AC |
4760 | memset (fname2, 0, sizeof (fname2)); |
4761 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4762 | printf_filtered ("cwd = '%s'\n", fname2); | |
4763 | else | |
8a3fe4f8 | 4764 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4765 | } |
4766 | if (exe_f || all) | |
4767 | { | |
89ecc4f5 | 4768 | sprintf (fname1, "/proc/%ld/exe", pid); |
dba24537 AC |
4769 | memset (fname2, 0, sizeof (fname2)); |
4770 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4771 | printf_filtered ("exe = '%s'\n", fname2); | |
4772 | else | |
8a3fe4f8 | 4773 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
4774 | } |
4775 | if (mappings_f || all) | |
4776 | { | |
89ecc4f5 | 4777 | sprintf (fname1, "/proc/%ld/maps", pid); |
d5d6fca5 | 4778 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4779 | { |
4780 | long long addr, endaddr, size, offset, inode; | |
4781 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 4782 | struct cleanup *cleanup; |
dba24537 | 4783 | |
7c8a8b04 | 4784 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 4785 | printf_filtered (_("Mapped address spaces:\n\n")); |
a97b0ac8 | 4786 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4787 | { |
4788 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
4789 | "Start Addr", | |
4790 | " End Addr", | |
4791 | " Size", " Offset", "objfile"); | |
4792 | } | |
4793 | else | |
4794 | { | |
4795 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
4796 | "Start Addr", | |
4797 | " End Addr", | |
4798 | " Size", " Offset", "objfile"); | |
4799 | } | |
4800 | ||
4801 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
4802 | &offset, &device[0], &inode, &filename[0])) | |
4803 | { | |
4804 | size = endaddr - addr; | |
4805 | ||
4806 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
4807 | calls here (and possibly above) should be abstracted | |
4808 | out into their own functions? Andrew suggests using | |
4809 | a generic local_address_string instead to print out | |
4810 | the addresses; that makes sense to me, too. */ | |
4811 | ||
a97b0ac8 | 4812 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4813 | { |
4814 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
4815 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4816 | (unsigned long) endaddr, | |
4817 | (int) size, | |
4818 | (unsigned int) offset, | |
4819 | filename[0] ? filename : ""); | |
4820 | } | |
4821 | else | |
4822 | { | |
4823 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
4824 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4825 | (unsigned long) endaddr, | |
4826 | (int) size, | |
4827 | (unsigned int) offset, | |
4828 | filename[0] ? filename : ""); | |
4829 | } | |
4830 | } | |
4831 | ||
7c8a8b04 | 4832 | do_cleanups (cleanup); |
dba24537 AC |
4833 | } |
4834 | else | |
8a3fe4f8 | 4835 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4836 | } |
4837 | if (status_f || all) | |
4838 | { | |
89ecc4f5 | 4839 | sprintf (fname1, "/proc/%ld/status", pid); |
d5d6fca5 | 4840 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4841 | { |
7c8a8b04 | 4842 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
e0881a8e | 4843 | |
dba24537 AC |
4844 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
4845 | puts_filtered (buffer); | |
7c8a8b04 | 4846 | do_cleanups (cleanup); |
dba24537 AC |
4847 | } |
4848 | else | |
8a3fe4f8 | 4849 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4850 | } |
4851 | if (stat_f || all) | |
4852 | { | |
89ecc4f5 | 4853 | sprintf (fname1, "/proc/%ld/stat", pid); |
d5d6fca5 | 4854 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4855 | { |
4856 | int itmp; | |
4857 | char ctmp; | |
a25694b4 | 4858 | long ltmp; |
7c8a8b04 | 4859 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4860 | |
4861 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 4862 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 4863 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 4864 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 4865 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 4866 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 4867 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4868 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 4869 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4870 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 4871 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4872 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 4873 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4874 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 4875 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4876 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
4877 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4878 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
4879 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4880 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
4881 | (unsigned long) ltmp); | |
4882 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4883 | printf_filtered (_("Minor faults, children: %lu\n"), | |
4884 | (unsigned long) ltmp); | |
4885 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4886 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
4887 | (unsigned long) ltmp); | |
4888 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4889 | printf_filtered (_("Major faults, children: %lu\n"), | |
4890 | (unsigned long) ltmp); | |
4891 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4892 | printf_filtered (_("utime: %ld\n"), ltmp); | |
4893 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4894 | printf_filtered (_("stime: %ld\n"), ltmp); | |
4895 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4896 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
4897 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4898 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
4899 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3e43a32a MS |
4900 | printf_filtered (_("jiffies remaining in current " |
4901 | "time slice: %ld\n"), ltmp); | |
a25694b4 AS |
4902 | if (fscanf (procfile, "%ld ", <mp) > 0) |
4903 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
4904 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4905 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
4906 | (unsigned long) ltmp); | |
4907 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4908 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
4909 | (unsigned long) ltmp); | |
4910 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3e43a32a MS |
4911 | printf_filtered (_("start time (jiffies since " |
4912 | "system boot): %ld\n"), ltmp); | |
a25694b4 AS |
4913 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4914 | printf_filtered (_("Virtual memory size: %lu\n"), | |
4915 | (unsigned long) ltmp); | |
4916 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3e43a32a MS |
4917 | printf_filtered (_("Resident set size: %lu\n"), |
4918 | (unsigned long) ltmp); | |
a25694b4 AS |
4919 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4920 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
4921 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4922 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
4923 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4924 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
4925 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4926 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
3e43a32a MS |
4927 | #if 0 /* Don't know how architecture-dependent the rest is... |
4928 | Anyway the signal bitmap info is available from "status". */ | |
1777feb0 | 4929 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 | 4930 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); |
1777feb0 | 4931 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 AS |
4932 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); |
4933 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4934 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
4935 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4936 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
4937 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4938 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
4939 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4940 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
1777feb0 | 4941 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 | 4942 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); |
dba24537 | 4943 | #endif |
7c8a8b04 | 4944 | do_cleanups (cleanup); |
dba24537 AC |
4945 | } |
4946 | else | |
8a3fe4f8 | 4947 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
4948 | } |
4949 | } | |
4950 | ||
10d6c8cd DJ |
4951 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
4952 | filesystem. Because we can use a single read() call for /proc, this | |
4953 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
4954 | but it doesn't support writes. */ | |
4955 | ||
4956 | static LONGEST | |
4957 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
4958 | const char *annex, gdb_byte *readbuf, | |
4959 | const gdb_byte *writebuf, | |
4960 | ULONGEST offset, LONGEST len) | |
dba24537 | 4961 | { |
10d6c8cd DJ |
4962 | LONGEST ret; |
4963 | int fd; | |
dba24537 AC |
4964 | char filename[64]; |
4965 | ||
10d6c8cd | 4966 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
4967 | return 0; |
4968 | ||
4969 | /* Don't bother for one word. */ | |
4970 | if (len < 3 * sizeof (long)) | |
4971 | return 0; | |
4972 | ||
4973 | /* We could keep this file open and cache it - possibly one per | |
4974 | thread. That requires some juggling, but is even faster. */ | |
4975 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
4976 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
4977 | if (fd == -1) | |
4978 | return 0; | |
4979 | ||
4980 | /* If pread64 is available, use it. It's faster if the kernel | |
4981 | supports it (only one syscall), and it's 64-bit safe even on | |
4982 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
4983 | application). */ | |
4984 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 4985 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 4986 | #else |
10d6c8cd | 4987 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
4988 | #endif |
4989 | ret = 0; | |
4990 | else | |
4991 | ret = len; | |
4992 | ||
4993 | close (fd); | |
4994 | return ret; | |
4995 | } | |
4996 | ||
efcbbd14 UW |
4997 | |
4998 | /* Enumerate spufs IDs for process PID. */ | |
4999 | static LONGEST | |
5000 | spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, LONGEST len) | |
5001 | { | |
5002 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
5003 | LONGEST pos = 0; | |
5004 | LONGEST written = 0; | |
5005 | char path[128]; | |
5006 | DIR *dir; | |
5007 | struct dirent *entry; | |
5008 | ||
5009 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
5010 | dir = opendir (path); | |
5011 | if (!dir) | |
5012 | return -1; | |
5013 | ||
5014 | rewinddir (dir); | |
5015 | while ((entry = readdir (dir)) != NULL) | |
5016 | { | |
5017 | struct stat st; | |
5018 | struct statfs stfs; | |
5019 | int fd; | |
5020 | ||
5021 | fd = atoi (entry->d_name); | |
5022 | if (!fd) | |
5023 | continue; | |
5024 | ||
5025 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
5026 | if (stat (path, &st) != 0) | |
5027 | continue; | |
5028 | if (!S_ISDIR (st.st_mode)) | |
5029 | continue; | |
5030 | ||
5031 | if (statfs (path, &stfs) != 0) | |
5032 | continue; | |
5033 | if (stfs.f_type != SPUFS_MAGIC) | |
5034 | continue; | |
5035 | ||
5036 | if (pos >= offset && pos + 4 <= offset + len) | |
5037 | { | |
5038 | store_unsigned_integer (buf + pos - offset, 4, byte_order, fd); | |
5039 | written += 4; | |
5040 | } | |
5041 | pos += 4; | |
5042 | } | |
5043 | ||
5044 | closedir (dir); | |
5045 | return written; | |
5046 | } | |
5047 | ||
5048 | /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5049 | object type, using the /proc file system. */ | |
5050 | static LONGEST | |
5051 | linux_proc_xfer_spu (struct target_ops *ops, enum target_object object, | |
5052 | const char *annex, gdb_byte *readbuf, | |
5053 | const gdb_byte *writebuf, | |
5054 | ULONGEST offset, LONGEST len) | |
5055 | { | |
5056 | char buf[128]; | |
5057 | int fd = 0; | |
5058 | int ret = -1; | |
5059 | int pid = PIDGET (inferior_ptid); | |
5060 | ||
5061 | if (!annex) | |
5062 | { | |
5063 | if (!readbuf) | |
5064 | return -1; | |
5065 | else | |
5066 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5067 | } | |
5068 | ||
5069 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
5070 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5071 | if (fd <= 0) | |
5072 | return -1; | |
5073 | ||
5074 | if (offset != 0 | |
5075 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5076 | { | |
5077 | close (fd); | |
5078 | return 0; | |
5079 | } | |
5080 | ||
5081 | if (writebuf) | |
5082 | ret = write (fd, writebuf, (size_t) len); | |
5083 | else if (readbuf) | |
5084 | ret = read (fd, readbuf, (size_t) len); | |
5085 | ||
5086 | close (fd); | |
5087 | return ret; | |
5088 | } | |
5089 | ||
5090 | ||
dba24537 AC |
5091 | /* Parse LINE as a signal set and add its set bits to SIGS. */ |
5092 | ||
5093 | static void | |
5094 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
5095 | { | |
5096 | int len = strlen (line) - 1; | |
5097 | const char *p; | |
5098 | int signum; | |
5099 | ||
5100 | if (line[len] != '\n') | |
8a3fe4f8 | 5101 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
5102 | |
5103 | p = line; | |
5104 | signum = len * 4; | |
5105 | while (len-- > 0) | |
5106 | { | |
5107 | int digit; | |
5108 | ||
5109 | if (*p >= '0' && *p <= '9') | |
5110 | digit = *p - '0'; | |
5111 | else if (*p >= 'a' && *p <= 'f') | |
5112 | digit = *p - 'a' + 10; | |
5113 | else | |
8a3fe4f8 | 5114 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
5115 | |
5116 | signum -= 4; | |
5117 | ||
5118 | if (digit & 1) | |
5119 | sigaddset (sigs, signum + 1); | |
5120 | if (digit & 2) | |
5121 | sigaddset (sigs, signum + 2); | |
5122 | if (digit & 4) | |
5123 | sigaddset (sigs, signum + 3); | |
5124 | if (digit & 8) | |
5125 | sigaddset (sigs, signum + 4); | |
5126 | ||
5127 | p++; | |
5128 | } | |
5129 | } | |
5130 | ||
5131 | /* Find process PID's pending signals from /proc/pid/status and set | |
5132 | SIGS to match. */ | |
5133 | ||
5134 | void | |
3e43a32a MS |
5135 | linux_proc_pending_signals (int pid, sigset_t *pending, |
5136 | sigset_t *blocked, sigset_t *ignored) | |
dba24537 AC |
5137 | { |
5138 | FILE *procfile; | |
5139 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
7c8a8b04 | 5140 | struct cleanup *cleanup; |
dba24537 AC |
5141 | |
5142 | sigemptyset (pending); | |
5143 | sigemptyset (blocked); | |
5144 | sigemptyset (ignored); | |
5145 | sprintf (fname, "/proc/%d/status", pid); | |
5146 | procfile = fopen (fname, "r"); | |
5147 | if (procfile == NULL) | |
8a3fe4f8 | 5148 | error (_("Could not open %s"), fname); |
7c8a8b04 | 5149 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
5150 | |
5151 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
5152 | { | |
5153 | /* Normal queued signals are on the SigPnd line in the status | |
5154 | file. However, 2.6 kernels also have a "shared" pending | |
5155 | queue for delivering signals to a thread group, so check for | |
5156 | a ShdPnd line also. | |
5157 | ||
5158 | Unfortunately some Red Hat kernels include the shared pending | |
5159 | queue but not the ShdPnd status field. */ | |
5160 | ||
5161 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
5162 | add_line_to_sigset (buffer + 8, pending); | |
5163 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
5164 | add_line_to_sigset (buffer + 8, pending); | |
5165 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
5166 | add_line_to_sigset (buffer + 8, blocked); | |
5167 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
5168 | add_line_to_sigset (buffer + 8, ignored); | |
5169 | } | |
5170 | ||
7c8a8b04 | 5171 | do_cleanups (cleanup); |
dba24537 AC |
5172 | } |
5173 | ||
07e059b5 VP |
5174 | static LONGEST |
5175 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
e0881a8e MS |
5176 | const char *annex, gdb_byte *readbuf, |
5177 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
07e059b5 | 5178 | { |
07e059b5 VP |
5179 | gdb_assert (object == TARGET_OBJECT_OSDATA); |
5180 | ||
d26e3629 | 5181 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5182 | } |
5183 | ||
10d6c8cd DJ |
5184 | static LONGEST |
5185 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
5186 | const char *annex, gdb_byte *readbuf, | |
5187 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
5188 | { | |
5189 | LONGEST xfer; | |
5190 | ||
5191 | if (object == TARGET_OBJECT_AUXV) | |
9f2982ff | 5192 | return memory_xfer_auxv (ops, object, annex, readbuf, writebuf, |
10d6c8cd DJ |
5193 | offset, len); |
5194 | ||
07e059b5 VP |
5195 | if (object == TARGET_OBJECT_OSDATA) |
5196 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
5197 | offset, len); | |
5198 | ||
efcbbd14 UW |
5199 | if (object == TARGET_OBJECT_SPU) |
5200 | return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf, | |
5201 | offset, len); | |
5202 | ||
8f313923 JK |
5203 | /* GDB calculates all the addresses in possibly larget width of the address. |
5204 | Address width needs to be masked before its final use - either by | |
5205 | linux_proc_xfer_partial or inf_ptrace_xfer_partial. | |
5206 | ||
5207 | Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */ | |
5208 | ||
5209 | if (object == TARGET_OBJECT_MEMORY) | |
5210 | { | |
5211 | int addr_bit = gdbarch_addr_bit (target_gdbarch); | |
5212 | ||
5213 | if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT)) | |
5214 | offset &= ((ULONGEST) 1 << addr_bit) - 1; | |
5215 | } | |
5216 | ||
10d6c8cd DJ |
5217 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
5218 | offset, len); | |
5219 | if (xfer != 0) | |
5220 | return xfer; | |
5221 | ||
5222 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
5223 | offset, len); | |
5224 | } | |
5225 | ||
e9efe249 | 5226 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
5227 | it with local methods. */ |
5228 | ||
910122bf UW |
5229 | static void |
5230 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 5231 | { |
6d8fd2b7 | 5232 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
eb73ad13 | 5233 | t->to_remove_fork_catchpoint = linux_child_remove_fork_catchpoint; |
6d8fd2b7 | 5234 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; |
eb73ad13 | 5235 | t->to_remove_vfork_catchpoint = linux_child_remove_vfork_catchpoint; |
6d8fd2b7 | 5236 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; |
eb73ad13 | 5237 | t->to_remove_exec_catchpoint = linux_child_remove_exec_catchpoint; |
a96d9b2e | 5238 | t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint; |
6d8fd2b7 | 5239 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; |
10d6c8cd | 5240 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
5241 | t->to_post_attach = linux_child_post_attach; |
5242 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
5243 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
5244 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
5245 | ||
5246 | super_xfer_partial = t->to_xfer_partial; | |
5247 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
5248 | } |
5249 | ||
5250 | struct target_ops * | |
5251 | linux_target (void) | |
5252 | { | |
5253 | struct target_ops *t; | |
5254 | ||
5255 | t = inf_ptrace_target (); | |
5256 | linux_target_install_ops (t); | |
5257 | ||
5258 | return t; | |
5259 | } | |
5260 | ||
5261 | struct target_ops * | |
7714d83a | 5262 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
5263 | { |
5264 | struct target_ops *t; | |
5265 | ||
5266 | t = inf_ptrace_trad_target (register_u_offset); | |
5267 | linux_target_install_ops (t); | |
10d6c8cd | 5268 | |
10d6c8cd DJ |
5269 | return t; |
5270 | } | |
5271 | ||
b84876c2 PA |
5272 | /* target_is_async_p implementation. */ |
5273 | ||
5274 | static int | |
5275 | linux_nat_is_async_p (void) | |
5276 | { | |
5277 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5278 | it explicitly with the "set target-async" command. |
b84876c2 | 5279 | Someday, linux will always be async. */ |
3dd5b83d | 5280 | return target_async_permitted; |
b84876c2 PA |
5281 | } |
5282 | ||
5283 | /* target_can_async_p implementation. */ | |
5284 | ||
5285 | static int | |
5286 | linux_nat_can_async_p (void) | |
5287 | { | |
5288 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5289 | it explicitly with the "set target-async" command. |
b84876c2 | 5290 | Someday, linux will always be async. */ |
3dd5b83d | 5291 | return target_async_permitted; |
b84876c2 PA |
5292 | } |
5293 | ||
9908b566 VP |
5294 | static int |
5295 | linux_nat_supports_non_stop (void) | |
5296 | { | |
5297 | return 1; | |
5298 | } | |
5299 | ||
d90e17a7 PA |
5300 | /* True if we want to support multi-process. To be removed when GDB |
5301 | supports multi-exec. */ | |
5302 | ||
2277426b | 5303 | int linux_multi_process = 1; |
d90e17a7 PA |
5304 | |
5305 | static int | |
5306 | linux_nat_supports_multi_process (void) | |
5307 | { | |
5308 | return linux_multi_process; | |
5309 | } | |
5310 | ||
b84876c2 PA |
5311 | static int async_terminal_is_ours = 1; |
5312 | ||
5313 | /* target_terminal_inferior implementation. */ | |
5314 | ||
5315 | static void | |
5316 | linux_nat_terminal_inferior (void) | |
5317 | { | |
5318 | if (!target_is_async_p ()) | |
5319 | { | |
5320 | /* Async mode is disabled. */ | |
5321 | terminal_inferior (); | |
5322 | return; | |
5323 | } | |
5324 | ||
b84876c2 PA |
5325 | terminal_inferior (); |
5326 | ||
d9d2d8b6 | 5327 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
5328 | if (!async_terminal_is_ours) |
5329 | return; | |
5330 | ||
5331 | delete_file_handler (input_fd); | |
5332 | async_terminal_is_ours = 0; | |
5333 | set_sigint_trap (); | |
5334 | } | |
5335 | ||
5336 | /* target_terminal_ours implementation. */ | |
5337 | ||
2c0b251b | 5338 | static void |
b84876c2 PA |
5339 | linux_nat_terminal_ours (void) |
5340 | { | |
5341 | if (!target_is_async_p ()) | |
5342 | { | |
5343 | /* Async mode is disabled. */ | |
5344 | terminal_ours (); | |
5345 | return; | |
5346 | } | |
5347 | ||
5348 | /* GDB should never give the terminal to the inferior if the | |
5349 | inferior is running in the background (run&, continue&, etc.), | |
5350 | but claiming it sure should. */ | |
5351 | terminal_ours (); | |
5352 | ||
b84876c2 PA |
5353 | if (async_terminal_is_ours) |
5354 | return; | |
5355 | ||
5356 | clear_sigint_trap (); | |
5357 | add_file_handler (input_fd, stdin_event_handler, 0); | |
5358 | async_terminal_is_ours = 1; | |
5359 | } | |
5360 | ||
5361 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
5362 | void *context); | |
5363 | static void *async_client_context; | |
5364 | ||
7feb7d06 PA |
5365 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5366 | so we notice when any child changes state, and notify the | |
5367 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
5368 | above to wait for the arrival of a SIGCHLD. */ | |
5369 | ||
b84876c2 | 5370 | static void |
7feb7d06 | 5371 | sigchld_handler (int signo) |
b84876c2 | 5372 | { |
7feb7d06 PA |
5373 | int old_errno = errno; |
5374 | ||
01124a23 DE |
5375 | if (debug_linux_nat) |
5376 | ui_file_write_async_safe (gdb_stdlog, | |
5377 | "sigchld\n", sizeof ("sigchld\n") - 1); | |
7feb7d06 PA |
5378 | |
5379 | if (signo == SIGCHLD | |
5380 | && linux_nat_event_pipe[0] != -1) | |
5381 | async_file_mark (); /* Let the event loop know that there are | |
5382 | events to handle. */ | |
5383 | ||
5384 | errno = old_errno; | |
5385 | } | |
5386 | ||
5387 | /* Callback registered with the target events file descriptor. */ | |
5388 | ||
5389 | static void | |
5390 | handle_target_event (int error, gdb_client_data client_data) | |
5391 | { | |
5392 | (*async_client_callback) (INF_REG_EVENT, async_client_context); | |
5393 | } | |
5394 | ||
5395 | /* Create/destroy the target events pipe. Returns previous state. */ | |
5396 | ||
5397 | static int | |
5398 | linux_async_pipe (int enable) | |
5399 | { | |
5400 | int previous = (linux_nat_event_pipe[0] != -1); | |
5401 | ||
5402 | if (previous != enable) | |
5403 | { | |
5404 | sigset_t prev_mask; | |
5405 | ||
5406 | block_child_signals (&prev_mask); | |
5407 | ||
5408 | if (enable) | |
5409 | { | |
5410 | if (pipe (linux_nat_event_pipe) == -1) | |
5411 | internal_error (__FILE__, __LINE__, | |
5412 | "creating event pipe failed."); | |
5413 | ||
5414 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5415 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5416 | } | |
5417 | else | |
5418 | { | |
5419 | close (linux_nat_event_pipe[0]); | |
5420 | close (linux_nat_event_pipe[1]); | |
5421 | linux_nat_event_pipe[0] = -1; | |
5422 | linux_nat_event_pipe[1] = -1; | |
5423 | } | |
5424 | ||
5425 | restore_child_signals_mask (&prev_mask); | |
5426 | } | |
5427 | ||
5428 | return previous; | |
b84876c2 PA |
5429 | } |
5430 | ||
5431 | /* target_async implementation. */ | |
5432 | ||
5433 | static void | |
5434 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
5435 | void *context), void *context) | |
5436 | { | |
b84876c2 PA |
5437 | if (callback != NULL) |
5438 | { | |
5439 | async_client_callback = callback; | |
5440 | async_client_context = context; | |
7feb7d06 PA |
5441 | if (!linux_async_pipe (1)) |
5442 | { | |
5443 | add_file_handler (linux_nat_event_pipe[0], | |
5444 | handle_target_event, NULL); | |
5445 | /* There may be pending events to handle. Tell the event loop | |
5446 | to poll them. */ | |
5447 | async_file_mark (); | |
5448 | } | |
b84876c2 PA |
5449 | } |
5450 | else | |
5451 | { | |
5452 | async_client_callback = callback; | |
5453 | async_client_context = context; | |
b84876c2 | 5454 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 5455 | linux_async_pipe (0); |
b84876c2 PA |
5456 | } |
5457 | return; | |
5458 | } | |
5459 | ||
252fbfc8 PA |
5460 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
5461 | event came out. */ | |
5462 | ||
4c28f408 | 5463 | static int |
252fbfc8 | 5464 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 5465 | { |
d90e17a7 | 5466 | if (!lwp->stopped) |
252fbfc8 | 5467 | { |
d90e17a7 | 5468 | ptid_t ptid = lwp->ptid; |
252fbfc8 | 5469 | |
d90e17a7 PA |
5470 | if (debug_linux_nat) |
5471 | fprintf_unfiltered (gdb_stdlog, | |
5472 | "LNSL: running -> suspending %s\n", | |
5473 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 5474 | |
252fbfc8 | 5475 | |
25289eb2 PA |
5476 | if (lwp->last_resume_kind == resume_stop) |
5477 | { | |
5478 | if (debug_linux_nat) | |
5479 | fprintf_unfiltered (gdb_stdlog, | |
5480 | "linux-nat: already stopping LWP %ld at " | |
5481 | "GDB's request\n", | |
5482 | ptid_get_lwp (lwp->ptid)); | |
5483 | return 0; | |
5484 | } | |
252fbfc8 | 5485 | |
25289eb2 PA |
5486 | stop_callback (lwp, NULL); |
5487 | lwp->last_resume_kind = resume_stop; | |
d90e17a7 PA |
5488 | } |
5489 | else | |
5490 | { | |
5491 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 5492 | |
d90e17a7 PA |
5493 | if (debug_linux_nat) |
5494 | { | |
e09875d4 | 5495 | if (find_thread_ptid (lwp->ptid)->stop_requested) |
3e43a32a MS |
5496 | fprintf_unfiltered (gdb_stdlog, |
5497 | "LNSL: already stopped/stop_requested %s\n", | |
d90e17a7 PA |
5498 | target_pid_to_str (lwp->ptid)); |
5499 | else | |
3e43a32a MS |
5500 | fprintf_unfiltered (gdb_stdlog, |
5501 | "LNSL: already stopped/no " | |
5502 | "stop_requested yet %s\n", | |
d90e17a7 | 5503 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
5504 | } |
5505 | } | |
4c28f408 PA |
5506 | return 0; |
5507 | } | |
5508 | ||
5509 | static void | |
5510 | linux_nat_stop (ptid_t ptid) | |
5511 | { | |
5512 | if (non_stop) | |
d90e17a7 | 5513 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4c28f408 PA |
5514 | else |
5515 | linux_ops->to_stop (ptid); | |
5516 | } | |
5517 | ||
d90e17a7 PA |
5518 | static void |
5519 | linux_nat_close (int quitting) | |
5520 | { | |
5521 | /* Unregister from the event loop. */ | |
5522 | if (target_is_async_p ()) | |
5523 | target_async (NULL, 0); | |
5524 | ||
d90e17a7 PA |
5525 | if (linux_ops->to_close) |
5526 | linux_ops->to_close (quitting); | |
5527 | } | |
5528 | ||
c0694254 PA |
5529 | /* When requests are passed down from the linux-nat layer to the |
5530 | single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are | |
5531 | used. The address space pointer is stored in the inferior object, | |
5532 | but the common code that is passed such ptid can't tell whether | |
5533 | lwpid is a "main" process id or not (it assumes so). We reverse | |
5534 | look up the "main" process id from the lwp here. */ | |
5535 | ||
5536 | struct address_space * | |
5537 | linux_nat_thread_address_space (struct target_ops *t, ptid_t ptid) | |
5538 | { | |
5539 | struct lwp_info *lwp; | |
5540 | struct inferior *inf; | |
5541 | int pid; | |
5542 | ||
5543 | pid = GET_LWP (ptid); | |
5544 | if (GET_LWP (ptid) == 0) | |
5545 | { | |
5546 | /* An (lwpid,0,0) ptid. Look up the lwp object to get at the | |
5547 | tgid. */ | |
5548 | lwp = find_lwp_pid (ptid); | |
5549 | pid = GET_PID (lwp->ptid); | |
5550 | } | |
5551 | else | |
5552 | { | |
5553 | /* A (pid,lwpid,0) ptid. */ | |
5554 | pid = GET_PID (ptid); | |
5555 | } | |
5556 | ||
5557 | inf = find_inferior_pid (pid); | |
5558 | gdb_assert (inf != NULL); | |
5559 | return inf->aspace; | |
5560 | } | |
5561 | ||
dc146f7c VP |
5562 | int |
5563 | linux_nat_core_of_thread_1 (ptid_t ptid) | |
5564 | { | |
5565 | struct cleanup *back_to; | |
5566 | char *filename; | |
5567 | FILE *f; | |
5568 | char *content = NULL; | |
5569 | char *p; | |
5570 | char *ts = 0; | |
5571 | int content_read = 0; | |
5572 | int i; | |
5573 | int core; | |
5574 | ||
5575 | filename = xstrprintf ("/proc/%d/task/%ld/stat", | |
5576 | GET_PID (ptid), GET_LWP (ptid)); | |
5577 | back_to = make_cleanup (xfree, filename); | |
5578 | ||
5579 | f = fopen (filename, "r"); | |
5580 | if (!f) | |
5581 | { | |
5582 | do_cleanups (back_to); | |
5583 | return -1; | |
5584 | } | |
5585 | ||
5586 | make_cleanup_fclose (f); | |
5587 | ||
5588 | for (;;) | |
5589 | { | |
5590 | int n; | |
e0881a8e | 5591 | |
dc146f7c VP |
5592 | content = xrealloc (content, content_read + 1024); |
5593 | n = fread (content + content_read, 1, 1024, f); | |
5594 | content_read += n; | |
5595 | if (n < 1024) | |
5596 | { | |
5597 | content[content_read] = '\0'; | |
5598 | break; | |
5599 | } | |
5600 | } | |
5601 | ||
5602 | make_cleanup (xfree, content); | |
5603 | ||
5604 | p = strchr (content, '('); | |
ca2a87a0 JK |
5605 | |
5606 | /* Skip ")". */ | |
5607 | if (p != NULL) | |
5608 | p = strchr (p, ')'); | |
5609 | if (p != NULL) | |
5610 | p++; | |
dc146f7c VP |
5611 | |
5612 | /* If the first field after program name has index 0, then core number is | |
5613 | the field with index 36. There's no constant for that anywhere. */ | |
ca2a87a0 JK |
5614 | if (p != NULL) |
5615 | p = strtok_r (p, " ", &ts); | |
5616 | for (i = 0; p != NULL && i != 36; ++i) | |
dc146f7c VP |
5617 | p = strtok_r (NULL, " ", &ts); |
5618 | ||
ca2a87a0 | 5619 | if (p == NULL || sscanf (p, "%d", &core) == 0) |
dc146f7c VP |
5620 | core = -1; |
5621 | ||
5622 | do_cleanups (back_to); | |
5623 | ||
5624 | return core; | |
5625 | } | |
5626 | ||
5627 | /* Return the cached value of the processor core for thread PTID. */ | |
5628 | ||
5629 | int | |
5630 | linux_nat_core_of_thread (struct target_ops *ops, ptid_t ptid) | |
5631 | { | |
5632 | struct lwp_info *info = find_lwp_pid (ptid); | |
e0881a8e | 5633 | |
dc146f7c VP |
5634 | if (info) |
5635 | return info->core; | |
5636 | return -1; | |
5637 | } | |
5638 | ||
f973ed9c DJ |
5639 | void |
5640 | linux_nat_add_target (struct target_ops *t) | |
5641 | { | |
f973ed9c DJ |
5642 | /* Save the provided single-threaded target. We save this in a separate |
5643 | variable because another target we've inherited from (e.g. inf-ptrace) | |
5644 | may have saved a pointer to T; we want to use it for the final | |
5645 | process stratum target. */ | |
5646 | linux_ops_saved = *t; | |
5647 | linux_ops = &linux_ops_saved; | |
5648 | ||
5649 | /* Override some methods for multithreading. */ | |
b84876c2 | 5650 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
5651 | t->to_attach = linux_nat_attach; |
5652 | t->to_detach = linux_nat_detach; | |
5653 | t->to_resume = linux_nat_resume; | |
5654 | t->to_wait = linux_nat_wait; | |
2455069d | 5655 | t->to_pass_signals = linux_nat_pass_signals; |
f973ed9c DJ |
5656 | t->to_xfer_partial = linux_nat_xfer_partial; |
5657 | t->to_kill = linux_nat_kill; | |
5658 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
5659 | t->to_thread_alive = linux_nat_thread_alive; | |
5660 | t->to_pid_to_str = linux_nat_pid_to_str; | |
4694da01 | 5661 | t->to_thread_name = linux_nat_thread_name; |
f973ed9c | 5662 | t->to_has_thread_control = tc_schedlock; |
c0694254 | 5663 | t->to_thread_address_space = linux_nat_thread_address_space; |
ebec9a0f PA |
5664 | t->to_stopped_by_watchpoint = linux_nat_stopped_by_watchpoint; |
5665 | t->to_stopped_data_address = linux_nat_stopped_data_address; | |
f973ed9c | 5666 | |
b84876c2 PA |
5667 | t->to_can_async_p = linux_nat_can_async_p; |
5668 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 5669 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 | 5670 | t->to_async = linux_nat_async; |
b84876c2 PA |
5671 | t->to_terminal_inferior = linux_nat_terminal_inferior; |
5672 | t->to_terminal_ours = linux_nat_terminal_ours; | |
d90e17a7 | 5673 | t->to_close = linux_nat_close; |
b84876c2 | 5674 | |
4c28f408 PA |
5675 | /* Methods for non-stop support. */ |
5676 | t->to_stop = linux_nat_stop; | |
5677 | ||
d90e17a7 PA |
5678 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
5679 | ||
dc146f7c VP |
5680 | t->to_core_of_thread = linux_nat_core_of_thread; |
5681 | ||
f973ed9c DJ |
5682 | /* We don't change the stratum; this target will sit at |
5683 | process_stratum and thread_db will set at thread_stratum. This | |
5684 | is a little strange, since this is a multi-threaded-capable | |
5685 | target, but we want to be on the stack below thread_db, and we | |
5686 | also want to be used for single-threaded processes. */ | |
5687 | ||
5688 | add_target (t); | |
f973ed9c DJ |
5689 | } |
5690 | ||
9f0bdab8 DJ |
5691 | /* Register a method to call whenever a new thread is attached. */ |
5692 | void | |
5693 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
5694 | { | |
5695 | /* Save the pointer. We only support a single registered instance | |
5696 | of the GNU/Linux native target, so we do not need to map this to | |
5697 | T. */ | |
5698 | linux_nat_new_thread = new_thread; | |
5699 | } | |
5700 | ||
5b009018 PA |
5701 | /* Register a method that converts a siginfo object between the layout |
5702 | that ptrace returns, and the layout in the architecture of the | |
5703 | inferior. */ | |
5704 | void | |
5705 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
5706 | int (*siginfo_fixup) (struct siginfo *, | |
5707 | gdb_byte *, | |
5708 | int)) | |
5709 | { | |
5710 | /* Save the pointer. */ | |
5711 | linux_nat_siginfo_fixup = siginfo_fixup; | |
5712 | } | |
5713 | ||
9f0bdab8 DJ |
5714 | /* Return the saved siginfo associated with PTID. */ |
5715 | struct siginfo * | |
5716 | linux_nat_get_siginfo (ptid_t ptid) | |
5717 | { | |
5718 | struct lwp_info *lp = find_lwp_pid (ptid); | |
5719 | ||
5720 | gdb_assert (lp != NULL); | |
5721 | ||
5722 | return &lp->siginfo; | |
5723 | } | |
5724 | ||
2c0b251b PA |
5725 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
5726 | extern initialize_file_ftype _initialize_linux_nat; | |
5727 | ||
d6b0e80f AC |
5728 | void |
5729 | _initialize_linux_nat (void) | |
5730 | { | |
1bedd215 AC |
5731 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
5732 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
5733 | Specify any process id, or use the program being debugged by default.\n\ |
5734 | Specify any of the following keywords for detailed info:\n\ | |
5735 | mappings -- list of mapped memory regions.\n\ | |
5736 | stat -- list a bunch of random process info.\n\ | |
5737 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 5738 | all -- list all available /proc info.")); |
d6b0e80f | 5739 | |
b84876c2 PA |
5740 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
5741 | &debug_linux_nat, _("\ | |
5742 | Set debugging of GNU/Linux lwp module."), _("\ | |
5743 | Show debugging of GNU/Linux lwp module."), _("\ | |
5744 | Enables printf debugging output."), | |
5745 | NULL, | |
5746 | show_debug_linux_nat, | |
5747 | &setdebuglist, &showdebuglist); | |
5748 | ||
b84876c2 | 5749 | /* Save this mask as the default. */ |
d6b0e80f AC |
5750 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
5751 | ||
7feb7d06 PA |
5752 | /* Install a SIGCHLD handler. */ |
5753 | sigchld_action.sa_handler = sigchld_handler; | |
5754 | sigemptyset (&sigchld_action.sa_mask); | |
5755 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
5756 | |
5757 | /* Make it the default. */ | |
7feb7d06 | 5758 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
5759 | |
5760 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
5761 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
5762 | sigdelset (&suspend_mask, SIGCHLD); | |
5763 | ||
7feb7d06 | 5764 | sigemptyset (&blocked_mask); |
10568435 JK |
5765 | |
5766 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
5767 | &disable_randomization, _("\ | |
5768 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
5769 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
5770 | When this mode is on (which is the default), randomization of the virtual\n\ | |
5771 | address space is disabled. Standalone programs run with the randomization\n\ | |
5772 | enabled by default on some platforms."), | |
5773 | &set_disable_randomization, | |
5774 | &show_disable_randomization, | |
5775 | &setlist, &showlist); | |
d6b0e80f AC |
5776 | } |
5777 | \f | |
5778 | ||
5779 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
5780 | the GNU/Linux Threads library and therefore doesn't really belong | |
5781 | here. */ | |
5782 | ||
5783 | /* Read variable NAME in the target and return its value if found. | |
5784 | Otherwise return zero. It is assumed that the type of the variable | |
5785 | is `int'. */ | |
5786 | ||
5787 | static int | |
5788 | get_signo (const char *name) | |
5789 | { | |
5790 | struct minimal_symbol *ms; | |
5791 | int signo; | |
5792 | ||
5793 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
5794 | if (ms == NULL) | |
5795 | return 0; | |
5796 | ||
8e70166d | 5797 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
5798 | sizeof (signo)) != 0) |
5799 | return 0; | |
5800 | ||
5801 | return signo; | |
5802 | } | |
5803 | ||
5804 | /* Return the set of signals used by the threads library in *SET. */ | |
5805 | ||
5806 | void | |
5807 | lin_thread_get_thread_signals (sigset_t *set) | |
5808 | { | |
5809 | struct sigaction action; | |
5810 | int restart, cancel; | |
5811 | ||
b84876c2 | 5812 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
5813 | sigemptyset (set); |
5814 | ||
5815 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
5816 | cancel = get_signo ("__pthread_sig_cancel"); |
5817 | ||
5818 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
5819 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
5820 | not provide any way for the debugger to query the signal numbers - | |
5821 | fortunately they don't change! */ | |
5822 | ||
d6b0e80f | 5823 | if (restart == 0) |
17fbb0bd | 5824 | restart = __SIGRTMIN; |
d6b0e80f | 5825 | |
d6b0e80f | 5826 | if (cancel == 0) |
17fbb0bd | 5827 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
5828 | |
5829 | sigaddset (set, restart); | |
5830 | sigaddset (set, cancel); | |
5831 | ||
5832 | /* The GNU/Linux Threads library makes terminating threads send a | |
5833 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
5834 | those (to prevent them from terminating GDB itself, which is | |
5835 | likely to be their default action) and treat them the same way as | |
5836 | SIGCHLD. */ | |
5837 | ||
5838 | action.sa_handler = sigchld_handler; | |
5839 | sigemptyset (&action.sa_mask); | |
58aecb61 | 5840 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
5841 | sigaction (cancel, &action, NULL); |
5842 | ||
5843 | /* We block the "cancel" signal throughout this code ... */ | |
5844 | sigaddset (&blocked_mask, cancel); | |
5845 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
5846 | ||
5847 | /* ... except during a sigsuspend. */ | |
5848 | sigdelset (&suspend_mask, cancel); | |
5849 | } |